[PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[David Ahern]

IPv6 uses the same data struct for both control plane (FIB entries) and
data path (dst entries). This struct has elements needed for both paths
adding memory overhead and complexity (taking a dst hold in most places
but an additional reference on rt6i_ref in a few). Furthermore, because
of the dst_alloc tie, all FIB entries are allocated with GFP_ATOMIC.

This patch set separates FIB entries from dst entries, better aligning
IPv6 code with IPv4, simplifying the reference counting and allowing
FIB entries added by userspace (not autoconf) to use GFP_KERNEL. It is
first step to a number of performance and scalability changes.

The end result of this patch set:
  - FIB entries (fib6_info):
        /* size: 208, cachelines: 4, members: 25 */
        /* sum members: 207, holes: 1, sum holes: 1 */

  - dst entries (rt6_info)
       /* size: 240, cachelines: 4, members: 11 */

Versus the the single rt6_info struct today for both paths:
      /* size: 320, cachelines: 5, members: 28 */

This amounts to a 35% reduction in memory use for FIB entries and a
25% reduction for dst entries.

With respect to locking FIB entries use RCU and a single atomic
counter with fib6_info_hold and fib6_info_release helpers to manage
the reference counting. dst entries use only the traditional dst
refcounts with dst_hold and dst_release.

FIB entries for host routes are referenced by inet6_ifaddr and
ifacaddr6. In both cases, additional holds are taken -- similar to
what is done for devices.

This set is the first of many changes to improve the scalability of the
IPv6 code. Follow on changes include:
- consolidating duplicate fib6_info references like IPv4 does with
  duplicate fib_info

- moving fib6_info into a slab cache to avoid allocation roundups to
  power of 2 (the 208 size becomes a 256 actual allocation)

- Allow FIB lookups without generating a dst (e.g., most rt6_lookup
  users just want to verify the egress device). Means moving dst
  allocation to the other side of fib6_rule_lookup which again aligns
  with IPv4 behavior

- using separate standalone nexthop objects which have performance
  benefits beyond fib_info consolidation

At this point I am not seeing any refcount leaks or underflows, no
oops or bug_ons, or warnings from kasan, so I think it is ready for
others to beat up on it finding errors in code paths I have missed.

RFC v2 changes
- improved commit messages
- move common metrics code from dst.c to net/ipv4/metrics.c (comment
  from DaveM)
- address comments from Wei Wang and Martin KaFai Lau (let me know if
  I missed something)
- fixes detected by kernel test robots
  + added fib6_metric_set to change metric on a FIB entry which could
    be pointing to read-only dst_default_metrics
  + 0day testing found a problem with an intermediate patch; added
    dst_hold_safe on rt->from. Code is removed 3 patches later
- allow cacheinfo to handle NULL dst; means only expires is pushed to
  userspace

David Ahern (21):
  net: Move fib_convert_metrics to metrics file
  net: Handle null dst in rtnl_put_cacheinfo
  vrf: Move fib6_table into net_vrf
  net/ipv6: Pass net to fib6_update_sernum
  net/ipv6: Pass net namespace to route functions
  net/ipv6: Move support functions up in route.c
  net/ipv6: Save route type in rt6_info
  net/ipv6: Move nexthop data to fib6_nh
  net/ipv6: Defer initialization of dst to data path
  net/ipv6: move metrics from dst to rt6_info
  net/ipv6: move expires into rt6_info
  net/ipv6: Add fib6_null_entry
  net/ipv6: Add rt6_info create function for ip6_pol_route_lookup
  net/ipv6: Move dst flags to booleans in fib entries
  net/ipv6: Create a neigh_lookup for FIB entries
  net/ipv6: Add gfp_flags to route add functions
  net/ipv6: Cleanup exception and cache route handling
  net/ipv6: introduce fib6_info struct and helpers
  net/ipv6: separate handling of FIB entries from dst based routes
  net/ipv6: Flip FIB entries to fib6_info
  net/ipv6: Remove unused code and variables for rt6_info

 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  |   96 +-
 drivers/net/vrf.c                                  |   25 +-
 include/net/if_inet6.h                             |    4 +-
 include/net/ip.h                                   |    3 +
 include/net/ip6_fib.h                              |  151 ++-
 include/net/ip6_route.h                            |   45 +-
 include/net/netns/ipv6.h                           |    3 +-
 net/core/dst.c                                     |    1 +
 net/core/rtnetlink.c                               |    8 +-
 net/ipv4/Makefile                                  |    3 +-
 net/ipv4/fib_semantics.c                           |   43 +-
 net/ipv4/metrics.c                                 |   53 +
 net/ipv6/addrconf.c                                |  118 +-
 net/ipv6/anycast.c                                 |   21 +-
 net/ipv6/ip6_fib.c                                 |  362 +++---
 net/ipv6/ip6_output.c                              |    3 +-
 net/ipv6/ndisc.c                                   |   40 +-
 net/ipv6/route.c                                   | 1364 ++++++++++----------
 net/ipv6/xfrm6_policy.c                            |    2 -
 19 files changed, 1206 insertions(+), 1139 deletions(-)
 create mode 100644 net/ipv4/metrics.c

-- 
2.11.0

[PATCH RFC v2 net-next 01/21] net: Move fib_convert_metrics to metrics file

[David Ahern]

Move logic of fib_convert_metrics into ip_metrics_convert. This allows
the code that converts netlink attributes into metrics struct to be
re-used in a later patch by IPv6.

This is mostly a code move with the following changes to variable names:
  - fi->fib_net becomes net
  - fc_mx and fc_mx_len are passed as inputs pulled from fib_config
  - metrics array is passed as an input from fi->fib_metrics->metrics

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip.h         |  3 +++
 net/ipv4/Makefile        |  3 ++-
 net/ipv4/fib_semantics.c | 43 ++-------------------------------------
 net/ipv4/metrics.c       | 53 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+), 42 deletions(-)
 create mode 100644 net/ipv4/metrics.c

diff --git a/include/net/ip.h b/include/net/ip.h
index fe63ba95d12b..c0e79ea3c502 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -380,6 +380,9 @@ static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
 	return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
 }
 
+int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len,
+		       u32 *metrics);
+
 u32 ip_idents_reserve(u32 hash, int segs);
 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
 
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index a07b7dd06def..b379520f9133 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -13,7 +13,8 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     tcp_offload.o datagram.o raw.o udp.o udplite.o \
 	     udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
 	     fib_frontend.o fib_semantics.o fib_trie.o fib_notifier.o \
-	     inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o
+	     inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o \
+	     metrics.o
 
 obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
 obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index e7c602c600ac..b3ebde36d706 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -1019,47 +1019,8 @@ static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc)
 static int
 fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg)
 {
-	bool ecn_ca = false;
-	struct nlattr *nla;
-	int remaining;
-
-	if (!cfg->fc_mx)
-		return 0;
-
-	nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
-		int type = nla_type(nla);
-		u32 val;
-
-		if (!type)
-			continue;
-		if (type > RTAX_MAX)
-			return -EINVAL;
-
-		if (type == RTAX_CC_ALGO) {
-			char tmp[TCP_CA_NAME_MAX];
-
-			nla_strlcpy(tmp, nla, sizeof(tmp));
-			val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca);
-			if (val == TCP_CA_UNSPEC)
-				return -EINVAL;
-		} else {
-			val = nla_get_u32(nla);
-		}
-		if (type == RTAX_ADVMSS && val > 65535 - 40)
-			val = 65535 - 40;
-		if (type == RTAX_MTU && val > 65535 - 15)
-			val = 65535 - 15;
-		if (type == RTAX_HOPLIMIT && val > 255)
-			val = 255;
-		if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
-			return -EINVAL;
-		fi->fib_metrics->metrics[type - 1] = val;
-	}
-
-	if (ecn_ca)
-		fi->fib_metrics->metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
-
-	return 0;
+	return ip_metrics_convert(fi->fib_net, cfg->fc_mx, cfg->fc_mx_len,
+				  fi->fib_metrics->metrics);
 }
 
 struct fib_info *fib_create_info(struct fib_config *cfg,
diff --git a/net/ipv4/metrics.c b/net/ipv4/metrics.c
new file mode 100644
index 000000000000..5121c6475e6b
--- /dev/null
+++ b/net/ipv4/metrics.c
@@ -0,0 +1,53 @@
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/net_namespace.h>
+#include <net/tcp.h>
+
+int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len,
+		       u32 *metrics)
+{
+	bool ecn_ca = false;
+	struct nlattr *nla;
+	int remaining;
+
+	if (!fc_mx)
+		return 0;
+
+	nla_for_each_attr(nla, fc_mx, fc_mx_len, remaining) {
+		int type = nla_type(nla);
+		u32 val;
+
+		if (!type)
+			continue;
+		if (type > RTAX_MAX)
+			return -EINVAL;
+
+		if (type == RTAX_CC_ALGO) {
+			char tmp[TCP_CA_NAME_MAX];
+
+			nla_strlcpy(tmp, nla, sizeof(tmp));
+			val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
+			if (val == TCP_CA_UNSPEC)
+				return -EINVAL;
+		} else {
+			val = nla_get_u32(nla);
+		}
+		if (type == RTAX_ADVMSS && val > 65535 - 40)
+			val = 65535 - 40;
+		if (type == RTAX_MTU && val > 65535 - 15)
+			val = 65535 - 15;
+		if (type == RTAX_HOPLIMIT && val > 255)
+			val = 255;
+		if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
+			return -EINVAL;
+		metrics[type - 1] = val;
+	}
+
+	if (ecn_ca)
+		metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_metrics_convert);
-- 
2.11.0

[PATCH RFC v2 net-next 02/21] net: Handle null dst in rtnl_put_cacheinfo

[David Ahern]

Need to keep expires time for IPv6 routes in a dump of FIB entries.
Update rtnl_put_cacheinfo to allow dst to be NULL in which case
rta_cacheinfo will only contain non-dst data.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/core/rtnetlink.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 87079eaa871b..33d6ee808155 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -780,13 +780,15 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 		       long expires, u32 error)
 {
 	struct rta_cacheinfo ci = {
-		.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
-		.rta_used = dst->__use,
-		.rta_clntref = atomic_read(&(dst->__refcnt)),
 		.rta_error = error,
 		.rta_id =  id,
 	};
 
+	if (dst) {
+		ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
+		ci.rta_used = dst->__use;
+		ci.rta_clntref = atomic_read(&dst->__refcnt);
+	}
 	if (expires) {
 		unsigned long clock;
 
-- 
2.11.0

[PATCH RFC v2 net-next 03/21] vrf: Move fib6_table into net_vrf

[David Ahern]

A later patch removes rt6i_table from rt6_info. Save the ipv6
table for a VRF in net_vrf. fib tables can not be deleted so
no reference counting or locking is required.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 drivers/net/vrf.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index c6be49d3a9eb..c0ffe20772f3 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -48,6 +48,9 @@ static unsigned int vrf_net_id;
 struct net_vrf {
 	struct rtable __rcu	*rth;
 	struct rt6_info	__rcu	*rt6;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct fib6_table	*fib6_table;
+#endif
 	u32                     tb_id;
 };
 
@@ -496,7 +499,6 @@ static int vrf_rt6_create(struct net_device *dev)
 	int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
 	struct net_vrf *vrf = netdev_priv(dev);
 	struct net *net = dev_net(dev);
-	struct fib6_table *rt6i_table;
 	struct rt6_info *rt6;
 	int rc = -ENOMEM;
 
@@ -504,8 +506,8 @@ static int vrf_rt6_create(struct net_device *dev)
 	if (!ipv6_mod_enabled())
 		return 0;
 
-	rt6i_table = fib6_new_table(net, vrf->tb_id);
-	if (!rt6i_table)
+	vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
+	if (!vrf->fib6_table)
 		goto out;
 
 	/* create a dst for routing packets out a VRF device */
@@ -513,7 +515,6 @@ static int vrf_rt6_create(struct net_device *dev)
 	if (!rt6)
 		goto out;
 
-	rt6->rt6i_table = rt6i_table;
 	rt6->dst.output	= vrf_output6;
 
 	rcu_assign_pointer(vrf->rt6, rt6);
@@ -945,22 +946,8 @@ static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
 					     int flags)
 {
 	struct net_vrf *vrf = netdev_priv(dev);
-	struct fib6_table *table = NULL;
-	struct rt6_info *rt6;
-
-	rcu_read_lock();
-
-	/* fib6_table does not have a refcnt and can not be freed */
-	rt6 = rcu_dereference(vrf->rt6);
-	if (likely(rt6))
-		table = rt6->rt6i_table;
-
-	rcu_read_unlock();
-
-	if (!table)
-		return NULL;
 
-	return ip6_pol_route(net, table, ifindex, fl6, skb, flags);
+	return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
 }
 
 static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
-- 
2.11.0

[PATCH RFC v2 net-next 04/21] net/ipv6: Pass net to fib6_update_sernum

[David Ahern]

Pass net namespace to fib6_update_sernum. It can not be marked const
as fib6_new_sernum will change ipv6.fib6_sernum.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h |  2 +-
 net/ipv6/ip6_fib.c    |  3 +--
 net/ipv6/route.c      | 10 +++++-----
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 5e86fd9dc857..f0aaf1c8f1a8 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -408,7 +408,7 @@ void __net_exit fib6_notifier_exit(struct net *net);
 unsigned int fib6_tables_seq_read(struct net *net);
 int fib6_tables_dump(struct net *net, struct notifier_block *nb);
 
-void fib6_update_sernum(struct rt6_info *rt);
+void fib6_update_sernum(struct net *net, struct rt6_info *rt);
 void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt);
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 2f995e9e3050..29a9e835faac 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -105,9 +105,8 @@ enum {
 	FIB6_NO_SERNUM_CHANGE = 0,
 };
 
-void fib6_update_sernum(struct rt6_info *rt)
+void fib6_update_sernum(struct net *net, struct rt6_info *rt)
 {
-	struct net *net = dev_net(rt->dst.dev);
 	struct fib6_node *fn;
 
 	fn = rcu_dereference_protected(rt->rt6i_node,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 939d122e71b4..8e4f0995e95a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1349,7 +1349,7 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	/* Update fn->fn_sernum to invalidate all cached dst */
 	if (!err) {
 		spin_lock_bh(&ort->rt6i_table->tb6_lock);
-		fib6_update_sernum(ort);
+		fib6_update_sernum(net, ort);
 		spin_unlock_bh(&ort->rt6i_table->tb6_lock);
 		fib6_force_start_gc(net);
 	}
@@ -3733,11 +3733,11 @@ void rt6_multipath_rebalance(struct rt6_info *rt)
 static int fib6_ifup(struct rt6_info *rt, void *p_arg)
 {
 	const struct arg_netdev_event *arg = p_arg;
-	const struct net *net = dev_net(arg->dev);
+	struct net *net = dev_net(arg->dev);
 
 	if (rt != net->ipv6.ip6_null_entry && rt->dst.dev == arg->dev) {
 		rt->rt6i_nh_flags &= ~arg->nh_flags;
-		fib6_update_sernum_upto_root(dev_net(rt->dst.dev), rt);
+		fib6_update_sernum_upto_root(net, rt);
 		rt6_multipath_rebalance(rt);
 	}
 
@@ -3816,7 +3816,7 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
 {
 	const struct arg_netdev_event *arg = p_arg;
 	const struct net_device *dev = arg->dev;
-	const struct net *net = dev_net(dev);
+	struct net *net = dev_net(dev);
 
 	if (rt == net->ipv6.ip6_null_entry)
 		return 0;
@@ -3839,7 +3839,7 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
 			}
 			rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
 						   RTNH_F_LINKDOWN);
-			fib6_update_sernum(rt);
+			fib6_update_sernum(net, rt);
 			rt6_multipath_rebalance(rt);
 		}
 		return -2;
-- 
2.11.0

[PATCH RFC v2 net-next 05/21] net/ipv6: Pass net namespace to route functions

[David Ahern]

Pass network namespace reference into route add, delete and get
functions.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_route.h | 12 ++++++-----
 net/ipv6/addrconf.c     | 33 ++++++++++++++++--------------
 net/ipv6/anycast.c      | 10 +++++----
 net/ipv6/ndisc.c        | 12 ++++++-----
 net/ipv6/route.c        | 54 +++++++++++++++++++++++++------------------------
 5 files changed, 66 insertions(+), 55 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index ce2abc0ff102..e486eb939f99 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -101,8 +101,8 @@ void ip6_route_cleanup(void);
 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 
 int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack);
-int ip6_ins_rt(struct rt6_info *);
-int ip6_del_rt(struct rt6_info *);
+int ip6_ins_rt(struct net *net, struct rt6_info *rt);
+int ip6_del_rt(struct net *net, struct rt6_info *rt);
 
 void rt6_flush_exceptions(struct rt6_info *rt);
 int rt6_remove_exception_rt(struct rt6_info *rt);
@@ -137,7 +137,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 
 void fib6_force_start_gc(struct net *net);
 
-struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
+struct rt6_info *addrconf_dst_alloc(struct net *net, struct inet6_dev *idev,
 				    const struct in6_addr *addr, bool anycast);
 
 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
@@ -147,9 +147,11 @@ struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
  *	support functions for ND
  *
  */
-struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
+struct rt6_info *rt6_get_dflt_router(struct net *net,
+				     const struct in6_addr *addr,
 				     struct net_device *dev);
-struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
+struct rt6_info *rt6_add_dflt_router(struct net *net,
+				     const struct in6_addr *gwaddr,
 				     struct net_device *dev, unsigned int pref);
 
 void rt6_purge_dflt_routers(struct net *net);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6fd4bbdc444f..2b0aa6d7eb17 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1049,7 +1049,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 		goto out;
 	}
 
-	rt = addrconf_dst_alloc(idev, addr, false);
+	rt = addrconf_dst_alloc(net, idev, addr, false);
 	if (IS_ERR(rt)) {
 		err = PTR_ERR(rt);
 		rt = NULL;
@@ -1199,7 +1199,7 @@ cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_r
 				       0, RTF_GATEWAY | RTF_DEFAULT);
 	if (rt) {
 		if (del_rt)
-			ip6_del_rt(rt);
+			ip6_del_rt(dev_net(ifp->idev->dev), rt);
 		else {
 			if (!(rt->rt6i_flags & RTF_EXPIRES))
 				rt6_set_expires(rt, expires);
@@ -2679,7 +2679,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 		if (rt) {
 			/* Autoconf prefix route */
 			if (valid_lft == 0) {
-				ip6_del_rt(rt);
+				ip6_del_rt(net, rt);
 				rt = NULL;
 			} else if (addrconf_finite_timeout(rt_expires)) {
 				/* not infinity */
@@ -3341,7 +3341,8 @@ static void addrconf_gre_config(struct net_device *dev)
 }
 #endif
 
-static int fixup_permanent_addr(struct inet6_dev *idev,
+static int fixup_permanent_addr(struct net *net,
+				struct inet6_dev *idev,
 				struct inet6_ifaddr *ifp)
 {
 	/* !rt6i_node means the host route was removed from the
@@ -3351,7 +3352,7 @@ static int fixup_permanent_addr(struct inet6_dev *idev,
 	if (!ifp->rt || !ifp->rt->rt6i_node) {
 		struct rt6_info *rt, *prev;
 
-		rt = addrconf_dst_alloc(idev, &ifp->addr, false);
+		rt = addrconf_dst_alloc(net, idev, &ifp->addr, false);
 		if (IS_ERR(rt))
 			return PTR_ERR(rt);
 
@@ -3375,7 +3376,7 @@ static int fixup_permanent_addr(struct inet6_dev *idev,
 	return 0;
 }
 
-static void addrconf_permanent_addr(struct net_device *dev)
+static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
 {
 	struct inet6_ifaddr *ifp, *tmp;
 	struct inet6_dev *idev;
@@ -3388,7 +3389,7 @@ static void addrconf_permanent_addr(struct net_device *dev)
 
 	list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
 		if ((ifp->flags & IFA_F_PERMANENT) &&
-		    fixup_permanent_addr(idev, ifp) < 0) {
+		    fixup_permanent_addr(net, idev, ifp) < 0) {
 			write_unlock_bh(&idev->lock);
 			in6_ifa_hold(ifp);
 			ipv6_del_addr(ifp);
@@ -3457,7 +3458,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 
 		if (event == NETDEV_UP) {
 			/* restore routes for permanent addresses */
-			addrconf_permanent_addr(dev);
+			addrconf_permanent_addr(net, dev);
 
 			if (!addrconf_link_ready(dev)) {
 				/* device is not ready yet. */
@@ -3743,7 +3744,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 		spin_unlock_bh(&ifa->lock);
 
 		if (rt)
-			ip6_del_rt(rt);
+			ip6_del_rt(net, rt);
 
 		if (state != INET6_IFADDR_STATE_DEAD) {
 			__ipv6_ifa_notify(RTM_DELADDR, ifa);
@@ -3861,6 +3862,7 @@ static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
 	struct inet6_dev *idev = ifp->idev;
 	struct net_device *dev = idev->dev;
 	bool bump_id, notify = false;
+	struct net *net;
 
 	addrconf_join_solict(dev, &ifp->addr);
 
@@ -3871,8 +3873,9 @@ static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
 	if (ifp->state == INET6_IFADDR_STATE_DEAD)
 		goto out;
 
+	net = dev_net(dev);
 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
-	    (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
+	    (net->ipv6.devconf_all->accept_dad < 1 &&
 	     idev->cnf.accept_dad < 1) ||
 	    !(ifp->flags&IFA_F_TENTATIVE) ||
 	    ifp->flags & IFA_F_NODAD) {
@@ -3908,8 +3911,8 @@ static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
 	 * Frames right away
 	 */
 	if (ifp->flags & IFA_F_OPTIMISTIC) {
-		ip6_ins_rt(ifp->rt);
-		if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
+		ip6_ins_rt(net, ifp->rt);
+		if (ipv6_use_optimistic_addr(net, idev)) {
 			/* Because optimistic nodes can use this address,
 			 * notify listeners. If DAD fails, RTM_DELADDR is sent.
 			 */
@@ -5621,7 +5624,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 		 * to do it again
 		 */
 		if (!rcu_access_pointer(ifp->rt->rt6i_node))
-			ip6_ins_rt(ifp->rt);
+			ip6_ins_rt(net, ifp->rt);
 		if (ifp->idev->cnf.forwarding)
 			addrconf_join_anycast(ifp);
 		if (!ipv6_addr_any(&ifp->peer_addr))
@@ -5638,11 +5641,11 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
 						       ifp->idev->dev, 0, 0);
 			if (rt)
-				ip6_del_rt(rt);
+				ip6_del_rt(net, rt);
 		}
 		if (ifp->rt) {
 			if (dst_hold_safe(&ifp->rt->dst))
-				ip6_del_rt(ifp->rt);
+				ip6_del_rt(net, ifp->rt);
 		}
 		rt_genid_bump_ipv6(net);
 		break;
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index d580d4d456a5..7ecdbabb16dd 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -247,6 +247,7 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 {
 	struct ifacaddr6 *aca;
 	struct rt6_info *rt;
+	struct net *net;
 	int err;
 
 	ASSERT_RTNL();
@@ -265,7 +266,8 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 		}
 	}
 
-	rt = addrconf_dst_alloc(idev, addr, true);
+	net = dev_net(idev->dev);
+	rt = addrconf_dst_alloc(net, idev, addr, true);
 	if (IS_ERR(rt)) {
 		err = PTR_ERR(rt);
 		goto out;
@@ -286,7 +288,7 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 	aca_get(aca);
 	write_unlock_bh(&idev->lock);
 
-	ip6_ins_rt(rt);
+	ip6_ins_rt(net, rt);
 
 	addrconf_join_solict(idev->dev, &aca->aca_addr);
 
@@ -329,7 +331,7 @@ int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 	addrconf_leave_solict(idev, &aca->aca_addr);
 
 	dst_hold(&aca->aca_rt->dst);
-	ip6_del_rt(aca->aca_rt);
+	ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
 
 	aca_put(aca);
 	return 0;
@@ -357,7 +359,7 @@ void ipv6_ac_destroy_dev(struct inet6_dev *idev)
 		addrconf_leave_solict(idev, &aca->aca_addr);
 
 		dst_hold(&aca->aca_rt->dst);
-		ip6_del_rt(aca->aca_rt);
+		ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
 
 		aca_put(aca);
 
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 10024eb0c521..4c6444a16d92 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1156,6 +1156,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	struct neighbour *neigh = NULL;
 	struct inet6_dev *in6_dev;
 	struct rt6_info *rt = NULL;
+	struct net *net;
 	int lifetime;
 	struct ndisc_options ndopts;
 	int optlen;
@@ -1253,9 +1254,9 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	/* Do not accept RA with source-addr found on local machine unless
 	 * accept_ra_from_local is set to true.
 	 */
+	net = dev_net(in6_dev->dev);
 	if (!in6_dev->cnf.accept_ra_from_local &&
-	    ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
-			  in6_dev->dev, 0)) {
+	    ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) {
 		ND_PRINTK(2, info,
 			  "RA from local address detected on dev: %s: default router ignored\n",
 			  skb->dev->name);
@@ -1272,7 +1273,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 		pref = ICMPV6_ROUTER_PREF_MEDIUM;
 #endif
 
-	rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
+	rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
 
 	if (rt) {
 		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
@@ -1285,7 +1286,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 		}
 	}
 	if (rt && lifetime == 0) {
-		ip6_del_rt(rt);
+		ip6_del_rt(net, rt);
 		rt = NULL;
 	}
 
@@ -1294,7 +1295,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	if (!rt && lifetime) {
 		ND_PRINTK(3, info, "RA: adding default router\n");
 
-		rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
+		rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr,
+					 skb->dev, pref);
 		if (!rt) {
 			ND_PRINTK(0, err,
 				  "RA: %s failed to add default route\n",
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8e4f0995e95a..049bb5c3a824 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -850,13 +850,13 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 	}
 
 	if (rinfo->prefix_len == 0)
-		rt = rt6_get_dflt_router(gwaddr, dev);
+		rt = rt6_get_dflt_router(net, gwaddr, dev);
 	else
 		rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
 					gwaddr, dev);
 
 	if (rt && !lifetime) {
-		ip6_del_rt(rt);
+		ip6_del_rt(net, rt);
 		rt = NULL;
 	}
 
@@ -1011,9 +1011,9 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
 	return err;
 }
 
-int ip6_ins_rt(struct rt6_info *rt)
+int ip6_ins_rt(struct net *net, struct rt6_info *rt)
 {
-	struct nl_info info = {	.nl_net = dev_net(rt->dst.dev), };
+	struct nl_info info = {	.nl_net = net, };
 	struct mx6_config mxc = { .mx = NULL, };
 
 	/* Hold dst to account for the reference from the fib6 tree */
@@ -1118,14 +1118,13 @@ static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
 	return pcpu_rt;
 }
 
-static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
+static struct rt6_info *rt6_make_pcpu_route(struct net *net,
+					    struct rt6_info *rt)
 {
 	struct rt6_info *pcpu_rt, *prev, **p;
 
 	pcpu_rt = ip6_rt_pcpu_alloc(rt);
 	if (!pcpu_rt) {
-		struct net *net = dev_net(rt->dst.dev);
-
 		dst_hold(&net->ipv6.ip6_null_entry->dst);
 		return net->ipv6.ip6_null_entry;
 	}
@@ -1758,7 +1757,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 				/* No dst_hold() on rt is needed because grabbing
 				 * rt->rt6i_ref makes sure rt can't be released.
 				 */
-				pcpu_rt = rt6_make_pcpu_route(rt);
+				pcpu_rt = rt6_make_pcpu_route(net, rt);
 				rt6_release(rt);
 			} else {
 				/* rt is already removed from tree */
@@ -2059,7 +2058,7 @@ static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
 	if (rt) {
 		if (rt->rt6i_flags & RTF_CACHE) {
 			if (rt6_check_expired(rt)) {
-				ip6_del_rt(rt);
+				ip6_del_rt(dev_net(dst->dev), rt);
 				dst = NULL;
 			}
 		} else {
@@ -2080,7 +2079,7 @@ static void ip6_link_failure(struct sk_buff *skb)
 	if (rt) {
 		if (rt->rt6i_flags & RTF_CACHE) {
 			if (dst_hold_safe(&rt->dst))
-				ip6_del_rt(rt);
+				ip6_del_rt(dev_net(rt->dst.dev), rt);
 		} else {
 			struct fib6_node *fn;
 
@@ -2966,9 +2965,9 @@ int ip6_route_add(struct fib6_config *cfg,
 
 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 {
-	int err;
+	struct net *net = info->nl_net;
 	struct fib6_table *table;
-	struct net *net = dev_net(rt->dst.dev);
+	int err;
 
 	if (rt == net->ipv6.ip6_null_entry) {
 		err = -ENOENT;
@@ -2985,11 +2984,10 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 	return err;
 }
 
-int ip6_del_rt(struct rt6_info *rt)
+int ip6_del_rt(struct net *net, struct rt6_info *rt)
 {
-	struct nl_info info = {
-		.nl_net = dev_net(rt->dst.dev),
-	};
+	struct nl_info info = { .nl_net = net };
+
 	return __ip6_del_rt(rt, &info);
 }
 
@@ -3324,13 +3322,15 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
 }
 #endif
 
-struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
+struct rt6_info *rt6_get_dflt_router(struct net *net,
+				     const struct in6_addr *addr,
+				     struct net_device *dev)
 {
 	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
 	struct rt6_info *rt;
 	struct fib6_table *table;
 
-	table = fib6_get_table(dev_net(dev), tb_id);
+	table = fib6_get_table(net, tb_id);
 	if (!table)
 		return NULL;
 
@@ -3347,7 +3347,8 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev
 	return rt;
 }
 
-struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
+struct rt6_info *rt6_add_dflt_router(struct net *net,
+				     const struct in6_addr *gwaddr,
 				     struct net_device *dev,
 				     unsigned int pref)
 {
@@ -3360,7 +3361,7 @@ struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 		.fc_protocol = RTPROT_RA,
 		.fc_nlinfo.portid = 0,
 		.fc_nlinfo.nlh = NULL,
-		.fc_nlinfo.nl_net = dev_net(dev),
+		.fc_nlinfo.nl_net = net,
 	};
 
 	cfg.fc_gateway = *gwaddr;
@@ -3373,10 +3374,11 @@ struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 			table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
 	}
 
-	return rt6_get_dflt_router(gwaddr, dev);
+	return rt6_get_dflt_router(net, gwaddr, dev);
 }
 
-static void __rt6_purge_dflt_routers(struct fib6_table *table)
+static void __rt6_purge_dflt_routers(struct net *net,
+				     struct fib6_table *table)
 {
 	struct rt6_info *rt;
 
@@ -3387,7 +3389,7 @@ static void __rt6_purge_dflt_routers(struct fib6_table *table)
 		    (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
 			if (dst_hold_safe(&rt->dst)) {
 				rcu_read_unlock();
-				ip6_del_rt(rt);
+				ip6_del_rt(net, rt);
 			} else {
 				rcu_read_unlock();
 			}
@@ -3411,7 +3413,7 @@ void rt6_purge_dflt_routers(struct net *net)
 		head = &net->ipv6.fib_table_hash[h];
 		hlist_for_each_entry_rcu(table, head, tb6_hlist) {
 			if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
-				__rt6_purge_dflt_routers(table);
+				__rt6_purge_dflt_routers(net, table);
 		}
 	}
 
@@ -3530,12 +3532,12 @@ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff
  *	Allocate a dst for local (unicast / anycast) address.
  */
 
-struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
+struct rt6_info *addrconf_dst_alloc(struct net *net,
+				    struct inet6_dev *idev,
 				    const struct in6_addr *addr,
 				    bool anycast)
 {
 	u32 tb_id;
-	struct net *net = dev_net(idev->dev);
 	struct net_device *dev = idev->dev;
 	struct rt6_info *rt;
 
-- 
2.11.0

[PATCH RFC v2 net-next 06/21] net/ipv6: Move support functions up in route.c

[David Ahern]

Code move only.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/ipv6/route.c | 119 +++++++++++++++++++++++++++----------------------------
 1 file changed, 59 insertions(+), 60 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 049bb5c3a824..662798496720 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -78,7 +78,6 @@ enum rt6_nud_state {
 	RT6_NUD_SUCCEED = 1
 };
 
-static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
 static struct dst_entry	*ip6_dst_check(struct dst_entry *dst, u32 cookie);
 static unsigned int	 ip6_default_advmss(const struct dst_entry *dst);
 static unsigned int	 ip6_mtu(const struct dst_entry *dst);
@@ -879,6 +878,65 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 }
 #endif
 
+/*
+ *	Misc support functions
+ */
+
+/* called with rcu_lock held */
+static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
+{
+	struct net_device *dev = rt->dst.dev;
+
+	if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) {
+		/* for copies of local routes, dst->dev needs to be the
+		 * device if it is a master device, the master device if
+		 * device is enslaved, and the loopback as the default
+		 */
+		if (netif_is_l3_slave(dev) &&
+		    !rt6_need_strict(&rt->rt6i_dst.addr))
+			dev = l3mdev_master_dev_rcu(dev);
+		else if (!netif_is_l3_master(dev))
+			dev = dev_net(dev)->loopback_dev;
+		/* last case is netif_is_l3_master(dev) is true in which
+		 * case we want dev returned to be dev
+		 */
+	}
+
+	return dev;
+}
+
+static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
+{
+	BUG_ON(from->from);
+
+	rt->rt6i_flags &= ~RTF_EXPIRES;
+	dst_hold(&from->dst);
+	rt->from = from;
+	dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
+}
+
+static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
+{
+	rt->dst.input = ort->dst.input;
+	rt->dst.output = ort->dst.output;
+	rt->rt6i_dst = ort->rt6i_dst;
+	rt->dst.error = ort->dst.error;
+	rt->rt6i_idev = ort->rt6i_idev;
+	if (rt->rt6i_idev)
+		in6_dev_hold(rt->rt6i_idev);
+	rt->dst.lastuse = jiffies;
+	rt->rt6i_gateway = ort->rt6i_gateway;
+	rt->rt6i_flags = ort->rt6i_flags;
+	rt6_set_from(rt, ort);
+	rt->rt6i_metric = ort->rt6i_metric;
+#ifdef CONFIG_IPV6_SUBTREES
+	rt->rt6i_src = ort->rt6i_src;
+#endif
+	rt->rt6i_prefsrc = ort->rt6i_prefsrc;
+	rt->rt6i_table = ort->rt6i_table;
+	rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
+}
+
 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
 					struct in6_addr *saddr)
 {
@@ -1021,29 +1079,6 @@ int ip6_ins_rt(struct net *net, struct rt6_info *rt)
 	return __ip6_ins_rt(rt, &info, &mxc, NULL);
 }
 
-/* called with rcu_lock held */
-static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
-{
-	struct net_device *dev = rt->dst.dev;
-
-	if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) {
-		/* for copies of local routes, dst->dev needs to be the
-		 * device if it is a master device, the master device if
-		 * device is enslaved, and the loopback as the default
-		 */
-		if (netif_is_l3_slave(dev) &&
-		    !rt6_need_strict(&rt->rt6i_dst.addr))
-			dev = l3mdev_master_dev_rcu(dev);
-		else if (!netif_is_l3_master(dev))
-			dev = dev_net(dev)->loopback_dev;
-		/* last case is netif_is_l3_master(dev) is true in which
-		 * case we want dev returned to be dev
-		 */
-	}
-
-	return dev;
-}
-
 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 					   const struct in6_addr *daddr,
 					   const struct in6_addr *saddr)
@@ -3218,42 +3253,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 	neigh_release(neigh);
 }
 
-/*
- *	Misc support functions
- */
-
-static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
-{
-	BUG_ON(from->from);
-
-	rt->rt6i_flags &= ~RTF_EXPIRES;
-	dst_hold(&from->dst);
-	rt->from = from;
-	dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
-}
-
-static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
-{
-	rt->dst.input = ort->dst.input;
-	rt->dst.output = ort->dst.output;
-	rt->rt6i_dst = ort->rt6i_dst;
-	rt->dst.error = ort->dst.error;
-	rt->rt6i_idev = ort->rt6i_idev;
-	if (rt->rt6i_idev)
-		in6_dev_hold(rt->rt6i_idev);
-	rt->dst.lastuse = jiffies;
-	rt->rt6i_gateway = ort->rt6i_gateway;
-	rt->rt6i_flags = ort->rt6i_flags;
-	rt6_set_from(rt, ort);
-	rt->rt6i_metric = ort->rt6i_metric;
-#ifdef CONFIG_IPV6_SUBTREES
-	rt->rt6i_src = ort->rt6i_src;
-#endif
-	rt->rt6i_prefsrc = ort->rt6i_prefsrc;
-	rt->rt6i_table = ort->rt6i_table;
-	rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
-}
-
 #ifdef CONFIG_IPV6_ROUTE_INFO
 static struct rt6_info *rt6_get_route_info(struct net *net,
 					   const struct in6_addr *prefix, int prefixlen,
-- 
2.11.0

[PATCH RFC v2 net-next 07/21] net/ipv6: Save route type in rt6_info

[David Ahern]

The RTN_ type for IPv6 FIB entries is currently embedded in rt6i_flags
and dst.error. Since dst is going to be removed, it can no longer be
relied on for FIB dumps so save the route type as fib6_type.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h |  1 +
 net/ipv6/addrconf.c   |  2 ++
 net/ipv6/route.c      | 46 ++++++++++++++++++++--------------------------
 3 files changed, 23 insertions(+), 26 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index f0aaf1c8f1a8..0165820bbafb 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -174,6 +174,7 @@ struct rt6_info {
 	int				rt6i_nh_weight;
 	unsigned short			rt6i_nfheader_len;
 	u8				rt6i_protocol;
+	u8				fib6_type;
 	u8				exception_bucket_flushed:1,
 					should_flush:1,
 					unused:6;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2b0aa6d7eb17..2313d74ccf46 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2343,6 +2343,7 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
 		.fc_flags = RTF_UP | flags,
 		.fc_nlinfo.nl_net = dev_net(dev),
 		.fc_protocol = RTPROT_KERNEL,
+		.fc_type = RTN_UNICAST,
 	};
 
 	cfg.fc_dst = *pfx;
@@ -2406,6 +2407,7 @@ static void addrconf_add_mroute(struct net_device *dev)
 		.fc_ifindex = dev->ifindex,
 		.fc_dst_len = 8,
 		.fc_flags = RTF_UP,
+		.fc_type = RTN_UNICAST,
 		.fc_nlinfo.nl_net = dev_net(dev),
 	};
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 662798496720..8c3b26c42bd4 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -307,6 +307,7 @@ static const struct rt6_info ip6_null_entry_template = {
 	.rt6i_protocol  = RTPROT_KERNEL,
 	.rt6i_metric	= ~(u32) 0,
 	.rt6i_ref	= ATOMIC_INIT(1),
+	.fib6_type	= RTN_UNREACHABLE,
 };
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -324,6 +325,7 @@ static const struct rt6_info ip6_prohibit_entry_template = {
 	.rt6i_protocol  = RTPROT_KERNEL,
 	.rt6i_metric	= ~(u32) 0,
 	.rt6i_ref	= ATOMIC_INIT(1),
+	.fib6_type	= RTN_PROHIBIT,
 };
 
 static const struct rt6_info ip6_blk_hole_entry_template = {
@@ -339,6 +341,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
 	.rt6i_protocol  = RTPROT_KERNEL,
 	.rt6i_metric	= ~(u32) 0,
 	.rt6i_ref	= ATOMIC_INIT(1),
+	.fib6_type	= RTN_BLACKHOLE,
 };
 
 #endif
@@ -2756,6 +2759,11 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		goto out;
 	}
 
+	if (cfg->fc_type > RTN_MAX) {
+		NL_SET_ERR_MSG(extack, "Invalid route type");
+		goto out;
+	}
+
 	if (cfg->fc_dst_len > 128) {
 		NL_SET_ERR_MSG(extack, "Invalid prefix length");
 		goto out;
@@ -2868,6 +2876,8 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	rt->rt6i_metric = cfg->fc_metric;
 	rt->rt6i_nh_weight = 1;
 
+	rt->fib6_type = cfg->fc_type;
+
 	/* We cannot add true routes via loopback here,
 	   they would result in kernel looping; promote them to reject routes
 	 */
@@ -3302,6 +3312,7 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
 		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
 				  RTF_UP | RTF_PREF(pref),
 		.fc_protocol = RTPROT_RA,
+		.fc_type = RTN_UNICAST,
 		.fc_nlinfo.portid = 0,
 		.fc_nlinfo.nlh = NULL,
 		.fc_nlinfo.nl_net = net,
@@ -3358,6 +3369,7 @@ struct rt6_info *rt6_add_dflt_router(struct net *net,
 		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
 				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
 		.fc_protocol = RTPROT_RA,
+		.fc_type = RTN_UNICAST,
 		.fc_nlinfo.portid = 0,
 		.fc_nlinfo.nlh = NULL,
 		.fc_nlinfo.nl_net = net,
@@ -3433,6 +3445,7 @@ static void rtmsg_to_fib6_config(struct net *net,
 	cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
 	cfg->fc_src_len = rtmsg->rtmsg_src_len;
 	cfg->fc_flags = rtmsg->rtmsg_flags;
+	cfg->fc_type = rtmsg->rtmsg_type;
 
 	cfg->fc_nlinfo.nl_net = net;
 
@@ -3553,10 +3566,13 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 
 	rt->rt6i_protocol = RTPROT_KERNEL;
 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
-	if (anycast)
+	if (anycast) {
+		rt->fib6_type = RTN_ANYCAST;
 		rt->rt6i_flags |= RTF_ANYCAST;
-	else
+	} else {
+		rt->fib6_type = RTN_LOCAL;
 		rt->rt6i_flags |= RTF_LOCAL;
+	}
 
 	rt->rt6i_gateway  = *addr;
 	rt->rt6i_dst.addr = *addr;
@@ -4467,30 +4483,8 @@ static int rt6_fill_node(struct net *net,
 	rtm->rtm_table = table;
 	if (nla_put_u32(skb, RTA_TABLE, table))
 		goto nla_put_failure;
-	if (rt->rt6i_flags & RTF_REJECT) {
-		switch (rt->dst.error) {
-		case -EINVAL:
-			rtm->rtm_type = RTN_BLACKHOLE;
-			break;
-		case -EACCES:
-			rtm->rtm_type = RTN_PROHIBIT;
-			break;
-		case -EAGAIN:
-			rtm->rtm_type = RTN_THROW;
-			break;
-		default:
-			rtm->rtm_type = RTN_UNREACHABLE;
-			break;
-		}
-	}
-	else if (rt->rt6i_flags & RTF_LOCAL)
-		rtm->rtm_type = RTN_LOCAL;
-	else if (rt->rt6i_flags & RTF_ANYCAST)
-		rtm->rtm_type = RTN_ANYCAST;
-	else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
-		rtm->rtm_type = RTN_LOCAL;
-	else
-		rtm->rtm_type = RTN_UNICAST;
+
+	rtm->rtm_type = rt->fib6_type;
 	rtm->rtm_flags = 0;
 	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
 	rtm->rtm_protocol = rt->rt6i_protocol;
-- 
2.11.0

[PATCH RFC v2 net-next 08/21] net/ipv6: Move nexthop data to fib6_nh

[David Ahern]

Introduce fib6_nh structure and move nexthop related data from
rt6_info and rt6_info.dst to fib6_nh. References to dev, gateway or
lwtstate from a FIB lookup perspective are converted to use fib6_nh;
datapath references to dst version are left as is.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  |  32 ++--
 include/net/ip6_fib.h                              |  16 +-
 include/net/ip6_route.h                            |   6 +-
 net/ipv6/addrconf.c                                |   2 +-
 net/ipv6/ip6_fib.c                                 |   6 +-
 net/ipv6/route.c                                   | 162 +++++++++++----------
 6 files changed, 125 insertions(+), 99 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 921bd1075edf..47ddcc2fd242 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -2704,9 +2704,9 @@ mlxsw_sp_nexthop6_group_cmp(const struct mlxsw_sp_nexthop_group *nh_grp,
 		struct in6_addr *gw;
 		int ifindex, weight;
 
-		ifindex = mlxsw_sp_rt6->rt->dst.dev->ifindex;
-		weight = mlxsw_sp_rt6->rt->rt6i_nh_weight;
-		gw = &mlxsw_sp_rt6->rt->rt6i_gateway;
+		ifindex = mlxsw_sp_rt6->rt->fib6_nh.nh_dev->ifindex;
+		weight = mlxsw_sp_rt6->rt->fib6_nh.nh_weight;
+		gw = &mlxsw_sp_rt6->rt->fib6_nh.nh_gw;
 		if (!mlxsw_sp_nexthop6_group_has_nexthop(nh_grp, gw, ifindex,
 							 weight))
 			return false;
@@ -2772,7 +2772,7 @@ mlxsw_sp_nexthop6_group_hash(struct mlxsw_sp_fib6_entry *fib6_entry, u32 seed)
 	struct net_device *dev;
 
 	list_for_each_entry(mlxsw_sp_rt6, &fib6_entry->rt6_list, list) {
-		dev = mlxsw_sp_rt6->rt->dst.dev;
+		dev = mlxsw_sp_rt6->rt->fib6_nh.nh_dev;
 		val ^= dev->ifindex;
 	}
 
@@ -3770,9 +3770,9 @@ mlxsw_sp_rt6_nexthop(struct mlxsw_sp_nexthop_group *nh_grp,
 		struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];
 		struct rt6_info *rt = mlxsw_sp_rt6->rt;
 
-		if (nh->rif && nh->rif->dev == rt->dst.dev &&
+		if (nh->rif && nh->rif->dev == rt->fib6_nh.nh_dev &&
 		    ipv6_addr_equal((const struct in6_addr *) &nh->gw_addr,
-				    &rt->rt6i_gateway))
+				    &rt->fib6_nh.nh_gw))
 			return nh;
 		continue;
 	}
@@ -3829,7 +3829,7 @@ mlxsw_sp_fib6_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)
 
 	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL) {
 		list_first_entry(&fib6_entry->rt6_list, struct mlxsw_sp_rt6,
-				 list)->rt->rt6i_nh_flags |= RTNH_F_OFFLOAD;
+				 list)->rt->fib6_nh.nh_flags |= RTNH_F_OFFLOAD;
 		return;
 	}
 
@@ -3839,9 +3839,9 @@ mlxsw_sp_fib6_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)
 
 		nh = mlxsw_sp_rt6_nexthop(nh_grp, mlxsw_sp_rt6);
 		if (nh && nh->offloaded)
-			mlxsw_sp_rt6->rt->rt6i_nh_flags |= RTNH_F_OFFLOAD;
+			mlxsw_sp_rt6->rt->fib6_nh.nh_flags |= RTNH_F_OFFLOAD;
 		else
-			mlxsw_sp_rt6->rt->rt6i_nh_flags &= ~RTNH_F_OFFLOAD;
+			mlxsw_sp_rt6->rt->fib6_nh.nh_flags &= ~RTNH_F_OFFLOAD;
 	}
 }
 
@@ -3856,7 +3856,7 @@ mlxsw_sp_fib6_entry_offload_unset(struct mlxsw_sp_fib_entry *fib_entry)
 	list_for_each_entry(mlxsw_sp_rt6, &fib6_entry->rt6_list, list) {
 		struct rt6_info *rt = mlxsw_sp_rt6->rt;
 
-		rt->rt6i_nh_flags &= ~RTNH_F_OFFLOAD;
+		rt->fib6_nh.nh_flags &= ~RTNH_F_OFFLOAD;
 	}
 }
 
@@ -4752,8 +4752,8 @@ static bool mlxsw_sp_nexthop6_ipip_type(const struct mlxsw_sp *mlxsw_sp,
 					const struct rt6_info *rt,
 					enum mlxsw_sp_ipip_type *ret)
 {
-	return rt->dst.dev &&
-	       mlxsw_sp_netdev_ipip_type(mlxsw_sp, rt->dst.dev, ret);
+	return rt->fib6_nh.nh_dev &&
+	       mlxsw_sp_netdev_ipip_type(mlxsw_sp, rt->fib6_nh.nh_dev, ret);
 }
 
 static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
@@ -4763,7 +4763,7 @@ static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
 {
 	const struct mlxsw_sp_ipip_ops *ipip_ops;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
-	struct net_device *dev = rt->dst.dev;
+	struct net_device *dev = rt->fib6_nh.nh_dev;
 	struct mlxsw_sp_rif *rif;
 	int err;
 
@@ -4806,11 +4806,11 @@ static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
 				  struct mlxsw_sp_nexthop *nh,
 				  const struct rt6_info *rt)
 {
-	struct net_device *dev = rt->dst.dev;
+	struct net_device *dev = rt->fib6_nh.nh_dev;
 
 	nh->nh_grp = nh_grp;
-	nh->nh_weight = rt->rt6i_nh_weight;
-	memcpy(&nh->gw_addr, &rt->rt6i_gateway, sizeof(nh->gw_addr));
+	nh->nh_weight = rt->fib6_nh.nh_weight;
+	memcpy(&nh->gw_addr, &rt->fib6_nh.nh_gw, sizeof(nh->gw_addr));
 	mlxsw_sp_nexthop_counter_alloc(mlxsw_sp, nh);
 
 	list_add_tail(&nh->router_list_node, &mlxsw_sp->router->nexthop_list);
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 0165820bbafb..f0a88370ba95 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -127,6 +127,16 @@ struct rt6_exception {
 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
 #define FIB6_MAX_DEPTH 5
 
+struct fib6_nh {
+	struct in6_addr		nh_gw;
+	struct net_device	*nh_dev;
+	struct lwtunnel_state	*nh_lwtstate;
+
+	unsigned int		nh_flags;
+	atomic_t		nh_upper_bound;
+	int			nh_weight;
+};
+
 struct rt6_info {
 	struct dst_entry		dst;
 	struct rt6_info __rcu		*rt6_next;
@@ -149,12 +159,9 @@ struct rt6_info {
 	 */
 	struct list_head		rt6i_siblings;
 	unsigned int			rt6i_nsiblings;
-	atomic_t			rt6i_nh_upper_bound;
 
 	atomic_t			rt6i_ref;
 
-	unsigned int			rt6i_nh_flags;
-
 	/* These are in a separate cache line. */
 	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;
 	u32				rt6i_flags;
@@ -171,13 +178,14 @@ struct rt6_info {
 	u32				rt6i_metric;
 	u32				rt6i_pmtu;
 	/* more non-fragment space at head required */
-	int				rt6i_nh_weight;
 	unsigned short			rt6i_nfheader_len;
 	u8				rt6i_protocol;
 	u8				fib6_type;
 	u8				exception_bucket_flushed:1,
 					should_flush:1,
 					unused:6;
+
+	struct fib6_nh			fib6_nh;
 };
 
 #define for_each_fib6_node_rt_rcu(fn)					\
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index e486eb939f99..8b07c3fcd32d 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -267,10 +267,10 @@ static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
 
 static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
 {
-	return a->dst.dev == b->dst.dev &&
+	return a->fib6_nh.nh_dev == b->fib6_nh.nh_dev &&
 	       a->rt6i_idev == b->rt6i_idev &&
-	       ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
-	       !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
+	       ipv6_addr_equal(&a->fib6_nh.nh_gw, &b->fib6_nh.nh_gw) &&
+	       !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate);
 }
 
 #endif
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2313d74ccf46..7d92c6e48d2e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2381,7 +2381,7 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 		goto out;
 
 	for_each_fib6_node_rt_rcu(fn) {
-		if (rt->dst.dev->ifindex != dev->ifindex)
+		if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
 			continue;
 		if ((rt->rt6i_flags & flags) != flags)
 			continue;
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 29a9e835faac..7326edab2acb 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -2214,6 +2214,7 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v)
 {
 	struct rt6_info *rt = v;
 	struct ipv6_route_iter *iter = seq->private;
+	const struct net_device *dev;
 
 	seq_printf(seq, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
 
@@ -2223,14 +2224,15 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v)
 	seq_puts(seq, "00000000000000000000000000000000 00 ");
 #endif
 	if (rt->rt6i_flags & RTF_GATEWAY)
-		seq_printf(seq, "%pi6", &rt->rt6i_gateway);
+		seq_printf(seq, "%pi6", &rt->fib6_nh.nh_gw);
 	else
 		seq_puts(seq, "00000000000000000000000000000000");
 
+	dev = rt->fib6_nh.nh_dev;
 	seq_printf(seq, " %08x %08x %08x %08x %8s\n",
 		   rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
 		   rt->dst.__use, rt->rt6i_flags,
-		   rt->dst.dev ? rt->dst.dev->name : "");
+		   dev ? dev->name : "");
 	iter->w.leaf = NULL;
 	return 0;
 }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8c3b26c42bd4..43e1ab7cdf4f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -466,12 +466,15 @@ static struct rt6_info *rt6_multipath_select(const struct net *net,
 	if (!fl6->mp_hash)
 		fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
 
-	if (fl6->mp_hash <= atomic_read(&match->rt6i_nh_upper_bound))
+	if (fl6->mp_hash <= atomic_read(&match->fib6_nh.nh_upper_bound))
 		return match;
 
 	list_for_each_entry_safe(sibling, next_sibling, &match->rt6i_siblings,
 				 rt6i_siblings) {
-		if (fl6->mp_hash > atomic_read(&sibling->rt6i_nh_upper_bound))
+		int nh_upper_bound;
+
+		nh_upper_bound = atomic_read(&sibling->fib6_nh.nh_upper_bound);
+		if (fl6->mp_hash > nh_upper_bound)
 			continue;
 		if (rt6_score_route(sibling, oif, strict) < 0)
 			break;
@@ -495,13 +498,14 @@ static inline struct rt6_info *rt6_device_match(struct net *net,
 	struct rt6_info *local = NULL;
 	struct rt6_info *sprt;
 
-	if (!oif && ipv6_addr_any(saddr) && !(rt->rt6i_nh_flags & RTNH_F_DEAD))
+	if (!oif && ipv6_addr_any(saddr) &&
+	    !(rt->fib6_nh.nh_flags & RTNH_F_DEAD))
 		return rt;
 
 	for (sprt = rt; sprt; sprt = rcu_dereference(sprt->rt6_next)) {
-		struct net_device *dev = sprt->dst.dev;
+		const struct net_device *dev = sprt->fib6_nh.nh_dev;
 
-		if (sprt->rt6i_nh_flags & RTNH_F_DEAD)
+		if (sprt->fib6_nh.nh_flags & RTNH_F_DEAD)
 			continue;
 
 		if (oif) {
@@ -533,7 +537,7 @@ static inline struct rt6_info *rt6_device_match(struct net *net,
 			return net->ipv6.ip6_null_entry;
 	}
 
-	return rt->rt6i_nh_flags & RTNH_F_DEAD ? net->ipv6.ip6_null_entry : rt;
+	return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.ip6_null_entry : rt;
 }
 
 #ifdef CONFIG_IPV6_ROUTER_PREF
@@ -558,7 +562,10 @@ static void rt6_probe_deferred(struct work_struct *w)
 static void rt6_probe(struct rt6_info *rt)
 {
 	struct __rt6_probe_work *work;
+	const struct in6_addr *nh_gw;
 	struct neighbour *neigh;
+	struct net_device *dev;
+
 	/*
 	 * Okay, this does not seem to be appropriate
 	 * for now, however, we need to check if it
@@ -569,8 +576,11 @@ static void rt6_probe(struct rt6_info *rt)
 	 */
 	if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
 		return;
+
+	nh_gw = &rt->fib6_nh.nh_gw;
+	dev = rt->fib6_nh.nh_dev;
 	rcu_read_lock_bh();
-	neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
+	neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
 	if (neigh) {
 		if (neigh->nud_state & NUD_VALID)
 			goto out;
@@ -592,9 +602,9 @@ static void rt6_probe(struct rt6_info *rt)
 
 	if (work) {
 		INIT_WORK(&work->work, rt6_probe_deferred);
-		work->target = rt->rt6i_gateway;
-		dev_hold(rt->dst.dev);
-		work->dev = rt->dst.dev;
+		work->target = *nh_gw;
+		dev_hold(dev);
+		work->dev = dev;
 		schedule_work(&work->work);
 	}
 
@@ -612,7 +622,8 @@ static inline void rt6_probe(struct rt6_info *rt)
  */
 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 {
-	struct net_device *dev = rt->dst.dev;
+	const struct net_device *dev = rt->fib6_nh.nh_dev;
+
 	if (!oif || dev->ifindex == oif)
 		return 2;
 	if ((dev->flags & IFF_LOOPBACK) &&
@@ -623,15 +634,16 @@ static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 
 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
 {
-	struct neighbour *neigh;
 	enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
+	struct neighbour *neigh;
 
 	if (rt->rt6i_flags & RTF_NONEXTHOP ||
 	    !(rt->rt6i_flags & RTF_GATEWAY))
 		return RT6_NUD_SUCCEED;
 
 	rcu_read_lock_bh();
-	neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
+	neigh = __ipv6_neigh_lookup_noref(rt->fib6_nh.nh_dev,
+					  &rt->fib6_nh.nh_gw);
 	if (neigh) {
 		read_lock(&neigh->lock);
 		if (neigh->nud_state & NUD_VALID)
@@ -679,11 +691,11 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 	bool match_do_rr = false;
 	struct inet6_dev *idev = rt->rt6i_idev;
 
-	if (rt->rt6i_nh_flags & RTNH_F_DEAD)
+	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
 		goto out;
 
 	if (idev->cnf.ignore_routes_with_linkdown &&
-	    rt->rt6i_nh_flags & RTNH_F_LINKDOWN &&
+	    rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
 	    !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
 		goto out;
 
@@ -888,7 +900,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 /* called with rcu_lock held */
 static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
 {
-	struct net_device *dev = rt->dst.dev;
+	struct net_device *dev = rt->fib6_nh.nh_dev;
 
 	if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) {
 		/* for copies of local routes, dst->dev needs to be the
@@ -928,7 +940,7 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
 	if (rt->rt6i_idev)
 		in6_dev_hold(rt->rt6i_idev);
 	rt->dst.lastuse = jiffies;
-	rt->rt6i_gateway = ort->rt6i_gateway;
+	rt->rt6i_gateway = ort->fib6_nh.nh_gw;
 	rt->rt6i_flags = ort->rt6i_flags;
 	rt6_set_from(rt, ort);
 	rt->rt6i_metric = ort->rt6i_metric;
@@ -937,7 +949,7 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
 #endif
 	rt->rt6i_prefsrc = ort->rt6i_prefsrc;
 	rt->rt6i_table = ort->rt6i_table;
-	rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
+	rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
 }
 
 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
@@ -1305,7 +1317,7 @@ __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
 static int rt6_insert_exception(struct rt6_info *nrt,
 				struct rt6_info *ort)
 {
-	struct net *net = dev_net(ort->dst.dev);
+	struct net *net = dev_net(nrt->dst.dev);
 	struct rt6_exception_bucket *bucket;
 	struct in6_addr *src_key = NULL;
 	struct rt6_exception *rt6_ex;
@@ -2267,7 +2279,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 restart:
 	for_each_fib6_node_rt_rcu(fn) {
-		if (rt->rt6i_nh_flags & RTNH_F_DEAD)
+		if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
 			continue;
 		if (rt6_check_expired(rt))
 			continue;
@@ -2275,14 +2287,14 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 			break;
 		if (!(rt->rt6i_flags & RTF_GATEWAY))
 			continue;
-		if (fl6->flowi6_oif != rt->dst.dev->ifindex)
+		if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
 			continue;
 		/* rt_cache's gateway might be different from its 'parent'
 		 * in the case of an ip redirect.
 		 * So we keep searching in the exception table if the gateway
 		 * is different.
 		 */
-		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) {
+		if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.nh_gw)) {
 			rt_cache = rt6_find_cached_rt(rt,
 						      &fl6->daddr,
 						      &fl6->saddr);
@@ -2859,7 +2871,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 					   &lwtstate, extack);
 		if (err)
 			goto out;
-		rt->dst.lwtstate = lwtstate_get(lwtstate);
+		rt->fib6_nh.nh_lwtstate = lwtstate_get(lwtstate);
 		lwtunnel_set_redirect(&rt->dst);
 	}
 
@@ -2874,7 +2886,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 #endif
 
 	rt->rt6i_metric = cfg->fc_metric;
-	rt->rt6i_nh_weight = 1;
+	rt->fib6_nh.nh_weight = 1;
 
 	rt->fib6_type = cfg->fc_type;
 
@@ -2929,7 +2941,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		if (err)
 			goto out;
 
-		rt->rt6i_gateway = cfg->fc_gateway;
+		rt->fib6_nh.nh_gw = rt->rt6i_gateway = cfg->fc_gateway;
 	}
 
 	err = -ENODEV;
@@ -2958,9 +2970,9 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 install_route:
 	if (!(rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
 	    !netif_carrier_ok(dev))
-		rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
-	rt->rt6i_nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
-	rt->dst.dev = dev;
+		rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
+	rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
+	rt->fib6_nh.nh_dev = rt->dst.dev = dev;
 	rt->rt6i_idev = idev;
 	rt->rt6i_table = table;
 
@@ -3119,11 +3131,11 @@ static int ip6_route_del(struct fib6_config *cfg,
 				rt = rt_cache;
 			}
 			if (cfg->fc_ifindex &&
-			    (!rt->dst.dev ||
-			     rt->dst.dev->ifindex != cfg->fc_ifindex))
+			    (!rt->fib6_nh.nh_dev ||
+			     rt->fib6_nh.nh_dev->ifindex != cfg->fc_ifindex))
 				continue;
 			if (cfg->fc_flags & RTF_GATEWAY &&
-			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
+			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->fib6_nh.nh_gw))
 				continue;
 			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
 				continue;
@@ -3285,11 +3297,11 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
 		goto out;
 
 	for_each_fib6_node_rt_rcu(fn) {
-		if (rt->dst.dev->ifindex != ifindex)
+		if (rt->fib6_nh.nh_dev->ifindex != ifindex)
 			continue;
 		if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
 			continue;
-		if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
+		if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
 			continue;
 		ip6_hold_safe(NULL, &rt, false);
 		break;
@@ -3346,9 +3358,9 @@ struct rt6_info *rt6_get_dflt_router(struct net *net,
 
 	rcu_read_lock();
 	for_each_fib6_node_rt_rcu(&table->tb6_root) {
-		if (dev == rt->dst.dev &&
+		if (dev == rt->fib6_nh.nh_dev &&
 		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
-		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
+		    ipv6_addr_equal(&rt->fib6_nh.nh_gw, addr))
 			break;
 	}
 	if (rt)
@@ -3574,6 +3586,8 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 		rt->rt6i_flags |= RTF_LOCAL;
 	}
 
+	rt->fib6_nh.nh_gw = *addr;
+	rt->fib6_nh.nh_dev = dev;
 	rt->rt6i_gateway  = *addr;
 	rt->rt6i_dst.addr = *addr;
 	rt->rt6i_dst.plen = 128;
@@ -3596,7 +3610,7 @@ static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
 	struct net *net = ((struct arg_dev_net_ip *)arg)->net;
 	struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
 
-	if (((void *)rt->dst.dev == dev || !dev) &&
+	if (((void *)rt->fib6_nh.nh_dev == dev || !dev) &&
 	    rt != net->ipv6.ip6_null_entry &&
 	    ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
 		spin_lock_bh(&rt6_exception_lock);
@@ -3628,7 +3642,7 @@ static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
 	struct in6_addr *gateway = (struct in6_addr *)arg;
 
 	if (((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
-	    ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
+	    ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
 		return -1;
 	}
 
@@ -3676,8 +3690,8 @@ static struct rt6_info *rt6_multipath_first_sibling(const struct rt6_info *rt)
 
 static bool rt6_is_dead(const struct rt6_info *rt)
 {
-	if (rt->rt6i_nh_flags & RTNH_F_DEAD ||
-	    (rt->rt6i_nh_flags & RTNH_F_LINKDOWN &&
+	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
+	    (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
 	     rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
 		return true;
 
@@ -3690,11 +3704,11 @@ static int rt6_multipath_total_weight(const struct rt6_info *rt)
 	int total = 0;
 
 	if (!rt6_is_dead(rt))
-		total += rt->rt6i_nh_weight;
+		total += rt->fib6_nh.nh_weight;
 
 	list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) {
 		if (!rt6_is_dead(iter))
-			total += iter->rt6i_nh_weight;
+			total += iter->fib6_nh.nh_weight;
 	}
 
 	return total;
@@ -3705,11 +3719,11 @@ static void rt6_upper_bound_set(struct rt6_info *rt, int *weight, int total)
 	int upper_bound = -1;
 
 	if (!rt6_is_dead(rt)) {
-		*weight += rt->rt6i_nh_weight;
+		*weight += rt->fib6_nh.nh_weight;
 		upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
 						    total) - 1;
 	}
-	atomic_set(&rt->rt6i_nh_upper_bound, upper_bound);
+	atomic_set(&rt->fib6_nh.nh_upper_bound, upper_bound);
 }
 
 static void rt6_multipath_upper_bound_set(struct rt6_info *rt, int total)
@@ -3752,8 +3766,8 @@ static int fib6_ifup(struct rt6_info *rt, void *p_arg)
 	const struct arg_netdev_event *arg = p_arg;
 	struct net *net = dev_net(arg->dev);
 
-	if (rt != net->ipv6.ip6_null_entry && rt->dst.dev == arg->dev) {
-		rt->rt6i_nh_flags &= ~arg->nh_flags;
+	if (rt != net->ipv6.ip6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
+		rt->fib6_nh.nh_flags &= ~arg->nh_flags;
 		fib6_update_sernum_upto_root(net, rt);
 		rt6_multipath_rebalance(rt);
 	}
@@ -3781,10 +3795,10 @@ static bool rt6_multipath_uses_dev(const struct rt6_info *rt,
 {
 	struct rt6_info *iter;
 
-	if (rt->dst.dev == dev)
+	if (rt->fib6_nh.nh_dev == dev)
 		return true;
 	list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
-		if (iter->dst.dev == dev)
+		if (iter->fib6_nh.nh_dev == dev)
 			return true;
 
 	return false;
@@ -3805,11 +3819,12 @@ static unsigned int rt6_multipath_dead_count(const struct rt6_info *rt,
 	struct rt6_info *iter;
 	unsigned int dead = 0;
 
-	if (rt->dst.dev == down_dev || rt->rt6i_nh_flags & RTNH_F_DEAD)
+	if (rt->fib6_nh.nh_dev == down_dev ||
+	    rt->fib6_nh.nh_flags & RTNH_F_DEAD)
 		dead++;
 	list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
-		if (iter->dst.dev == down_dev ||
-		    iter->rt6i_nh_flags & RTNH_F_DEAD)
+		if (iter->fib6_nh.nh_dev == down_dev ||
+		    iter->fib6_nh.nh_flags & RTNH_F_DEAD)
 			dead++;
 
 	return dead;
@@ -3821,11 +3836,11 @@ static void rt6_multipath_nh_flags_set(struct rt6_info *rt,
 {
 	struct rt6_info *iter;
 
-	if (rt->dst.dev == dev)
-		rt->rt6i_nh_flags |= nh_flags;
+	if (rt->fib6_nh.nh_dev == dev)
+		rt->fib6_nh.nh_flags |= nh_flags;
 	list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
-		if (iter->dst.dev == dev)
-			iter->rt6i_nh_flags |= nh_flags;
+		if (iter->fib6_nh.nh_dev == dev)
+			iter->fib6_nh.nh_flags |= nh_flags;
 }
 
 /* called with write lock held for table with rt */
@@ -3840,12 +3855,12 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
 
 	switch (arg->event) {
 	case NETDEV_UNREGISTER:
-		return rt->dst.dev == dev ? -1 : 0;
+		return rt->fib6_nh.nh_dev == dev ? -1 : 0;
 	case NETDEV_DOWN:
 		if (rt->should_flush)
 			return -1;
 		if (!rt->rt6i_nsiblings)
-			return rt->dst.dev == dev ? -1 : 0;
+			return rt->fib6_nh.nh_dev == dev ? -1 : 0;
 		if (rt6_multipath_uses_dev(rt, dev)) {
 			unsigned int count;
 
@@ -3861,10 +3876,10 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
 		}
 		return -2;
 	case NETDEV_CHANGE:
-		if (rt->dst.dev != dev ||
+		if (rt->fib6_nh.nh_dev != dev ||
 		    rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST))
 			break;
-		rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
+		rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
 		rt6_multipath_rebalance(rt);
 		break;
 	}
@@ -3925,7 +3940,7 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
 	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
 	   PMTU discovery.
 	 */
-	if (rt->dst.dev == arg->dev &&
+	if (rt->fib6_nh.nh_dev == arg->dev &&
 	    dst_metric_raw(&rt->dst, RTAX_MTU) &&
 	    !dst_metric_locked(&rt->dst, RTAX_MTU)) {
 		spin_lock_bh(&rt6_exception_lock);
@@ -4213,7 +4228,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 			goto cleanup;
 		}
 
-		rt->rt6i_nh_weight = rtnh->rtnh_hops + 1;
+		rt->fib6_nh.nh_weight = rtnh->rtnh_hops + 1;
 
 		err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
 		if (err) {
@@ -4370,7 +4385,7 @@ static size_t rt6_nlmsg_size(struct rt6_info *rt)
 		nexthop_len = nla_total_size(0)	 /* RTA_MULTIPATH */
 			    + NLA_ALIGN(sizeof(struct rtnexthop))
 			    + nla_total_size(16) /* RTA_GATEWAY */
-			    + lwtunnel_get_encap_size(rt->dst.lwtstate);
+			    + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate);
 
 		nexthop_len *= rt->rt6i_nsiblings;
 	}
@@ -4388,38 +4403,38 @@ static size_t rt6_nlmsg_size(struct rt6_info *rt)
 	       + nla_total_size(sizeof(struct rta_cacheinfo))
 	       + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
 	       + nla_total_size(1) /* RTA_PREF */
-	       + lwtunnel_get_encap_size(rt->dst.lwtstate)
+	       + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate)
 	       + nexthop_len;
 }
 
 static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
 			    unsigned int *flags, bool skip_oif)
 {
-	if (rt->rt6i_nh_flags & RTNH_F_DEAD)
+	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
 		*flags |= RTNH_F_DEAD;
 
-	if (rt->rt6i_nh_flags & RTNH_F_LINKDOWN) {
+	if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
 		*flags |= RTNH_F_LINKDOWN;
 		if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
 			*flags |= RTNH_F_DEAD;
 	}
 
 	if (rt->rt6i_flags & RTF_GATEWAY) {
-		if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
+		if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
 			goto nla_put_failure;
 	}
 
-	*flags |= (rt->rt6i_nh_flags & RTNH_F_ONLINK);
-	if (rt->rt6i_nh_flags & RTNH_F_OFFLOAD)
+	*flags |= (rt->fib6_nh.nh_flags & RTNH_F_ONLINK);
+	if (rt->fib6_nh.nh_flags & RTNH_F_OFFLOAD)
 		*flags |= RTNH_F_OFFLOAD;
 
 	/* not needed for multipath encoding b/c it has a rtnexthop struct */
-	if (!skip_oif && rt->dst.dev &&
-	    nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
+	if (!skip_oif && rt->fib6_nh.nh_dev &&
+	    nla_put_u32(skb, RTA_OIF, rt->fib6_nh.nh_dev->ifindex))
 		goto nla_put_failure;
 
-	if (rt->dst.lwtstate &&
-	    lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
+	if (rt->fib6_nh.nh_lwtstate &&
+	    lwtunnel_fill_encap(skb, rt->fib6_nh.nh_lwtstate) < 0)
 		goto nla_put_failure;
 
 	return 0;
@@ -4431,6 +4446,7 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
 /* add multipath next hop */
 static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
 {
+	const struct net_device *dev = rt->fib6_nh.nh_dev;
 	struct rtnexthop *rtnh;
 	unsigned int flags = 0;
 
@@ -4438,8 +4454,8 @@ static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
 	if (!rtnh)
 		goto nla_put_failure;
 
-	rtnh->rtnh_hops = rt->rt6i_nh_weight - 1;
-	rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
+	rtnh->rtnh_hops = rt->fib6_nh.nh_weight - 1;
+	rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
 
 	if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
 		goto nla_put_failure;
-- 
2.11.0

[PATCH RFC v2 net-next 09/21] net/ipv6: Defer initialization of dst to data path

[David Ahern]

Defer setting dst input, output and error until fib entry is copied.

The reject path from ip6_route_info_create is moved to a new function
ip6_rt_init_dst_reject with a helper doing the conversion from fib6_type
to dst error.

The remainder of the new ip6_rt_init_dst is an amalgamtion of dst code
from addrconf_dst_alloc and the non-reject path of ip6_route_info_create.
The dst output function is always ip6_output and the input function is
either ip6_input (local routes), ip6_mc_input (multicast routes) or
ip6_forward (anything else).

A couple of places using dst.error are updated to look at rt6i_flags.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/ipv6/route.c | 115 +++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 74 insertions(+), 41 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 43e1ab7cdf4f..adff60c07ae9 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -920,6 +920,75 @@ static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
 	return dev;
 }
 
+static const int fib6_prop[RTN_MAX + 1] = {
+	[RTN_UNSPEC]	= 0,
+	[RTN_UNICAST]	= 0,
+	[RTN_LOCAL]	= 0,
+	[RTN_BROADCAST]	= 0,
+	[RTN_ANYCAST]	= 0,
+	[RTN_MULTICAST]	= 0,
+	[RTN_BLACKHOLE]	= -EINVAL,
+	[RTN_UNREACHABLE] = -EHOSTUNREACH,
+	[RTN_PROHIBIT]	= -EACCES,
+	[RTN_THROW]	= -EAGAIN,
+	[RTN_NAT]	= -EINVAL,
+	[RTN_XRESOLVE]	= -EINVAL,
+};
+
+static int ip6_rt_type_to_error(u8 fib6_type)
+{
+	return fib6_prop[fib6_type];
+}
+
+static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
+{
+	rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
+
+	switch (ort->fib6_type) {
+	case RTN_BLACKHOLE:
+		rt->dst.output = dst_discard_out;
+		rt->dst.input = dst_discard;
+		break;
+	case RTN_PROHIBIT:
+		rt->dst.output = ip6_pkt_prohibit_out;
+		rt->dst.input = ip6_pkt_prohibit;
+		break;
+	case RTN_THROW:
+	case RTN_UNREACHABLE:
+	default:
+		rt->dst.output = ip6_pkt_discard_out;
+		rt->dst.input = ip6_pkt_discard;
+		break;
+	}
+}
+
+static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
+{
+	if (ort->rt6i_flags & RTF_REJECT) {
+		ip6_rt_init_dst_reject(rt, ort);
+		return;
+	}
+
+	rt->dst.error = 0;
+	rt->dst.output = ip6_output;
+
+	if (ort->fib6_type == RTN_LOCAL) {
+		rt->dst.flags |= DST_HOST;
+		rt->dst.input = ip6_input;
+	} else if (ipv6_addr_type(&ort->rt6i_dst.addr) & IPV6_ADDR_MULTICAST) {
+		rt->dst.input = ip6_mc_input;
+	} else {
+		rt->dst.input = ip6_forward;
+	}
+
+	if (ort->fib6_nh.nh_lwtstate) {
+		rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
+		lwtunnel_set_redirect(&rt->dst);
+	}
+
+	rt->dst.lastuse = jiffies;
+}
+
 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 {
 	BUG_ON(from->from);
@@ -932,14 +1001,12 @@ static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 
 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
 {
-	rt->dst.input = ort->dst.input;
-	rt->dst.output = ort->dst.output;
+	ip6_rt_init_dst(rt, ort);
+
 	rt->rt6i_dst = ort->rt6i_dst;
-	rt->dst.error = ort->dst.error;
 	rt->rt6i_idev = ort->rt6i_idev;
 	if (rt->rt6i_idev)
 		in6_dev_hold(rt->rt6i_idev);
-	rt->dst.lastuse = jiffies;
 	rt->rt6i_gateway = ort->fib6_nh.nh_gw;
 	rt->rt6i_flags = ort->rt6i_flags;
 	rt6_set_from(rt, ort);
@@ -2283,7 +2350,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 			continue;
 		if (rt6_check_expired(rt))
 			continue;
-		if (rt->dst.error)
+		if (rt->rt6i_flags & RTF_REJECT)
 			break;
 		if (!(rt->rt6i_flags & RTF_GATEWAY))
 			continue;
@@ -2311,7 +2378,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 
 	if (!rt)
 		rt = net->ipv6.ip6_null_entry;
-	else if (rt->dst.error) {
+	else if (rt->rt6i_flags & RTF_REJECT) {
 		rt = net->ipv6.ip6_null_entry;
 		goto out;
 	}
@@ -2854,15 +2921,6 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 
 	addr_type = ipv6_addr_type(&cfg->fc_dst);
 
-	if (addr_type & IPV6_ADDR_MULTICAST)
-		rt->dst.input = ip6_mc_input;
-	else if (cfg->fc_flags & RTF_LOCAL)
-		rt->dst.input = ip6_input;
-	else
-		rt->dst.input = ip6_forward;
-
-	rt->dst.output = ip6_output;
-
 	if (cfg->fc_encap) {
 		struct lwtunnel_state *lwtstate;
 
@@ -2872,7 +2930,6 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		if (err)
 			goto out;
 		rt->fib6_nh.nh_lwtstate = lwtstate_get(lwtstate);
-		lwtunnel_set_redirect(&rt->dst);
 	}
 
 	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
@@ -2912,27 +2969,6 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 			}
 		}
 		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
-		switch (cfg->fc_type) {
-		case RTN_BLACKHOLE:
-			rt->dst.error = -EINVAL;
-			rt->dst.output = dst_discard_out;
-			rt->dst.input = dst_discard;
-			break;
-		case RTN_PROHIBIT:
-			rt->dst.error = -EACCES;
-			rt->dst.output = ip6_pkt_prohibit_out;
-			rt->dst.input = ip6_pkt_prohibit;
-			break;
-		case RTN_THROW:
-		case RTN_UNREACHABLE:
-		default:
-			rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
-					: (cfg->fc_type == RTN_UNREACHABLE)
-					? -EHOSTUNREACH : -ENETUNREACH;
-			rt->dst.output = ip6_pkt_discard_out;
-			rt->dst.input = ip6_pkt_discard;
-			break;
-		}
 		goto install_route;
 	}
 
@@ -3570,12 +3606,9 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 		return ERR_PTR(-ENOMEM);
 
 	in6_dev_hold(idev);
-
-	rt->dst.flags |= DST_HOST;
-	rt->dst.input = ip6_input;
-	rt->dst.output = ip6_output;
 	rt->rt6i_idev = idev;
 
+	rt->dst.flags |= DST_HOST;
 	rt->rt6i_protocol = RTPROT_KERNEL;
 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
 	if (anycast) {
-- 
2.11.0

[PATCH RFC v2 net-next 10/21] net/ipv6: move metrics from dst to rt6_info

[David Ahern]

Similar to IPv4, add fib metrics to the fib struct, which at the moment
is rt6_info. Will be moved to fib6_info in a later patch. Copy metrics
into dst by reference using refcount.

To make the transition:
- add dst_metrics to rt6_info. Default to dst_default_metrics if no
  metrics are passed during route add. No need for a separate pmtu
  entry; it can reference the MTU slot in fib6_metrics

- ip6_convert_metrics allocates memory in the FIB entry and uses
  ip_metrics_convert to copy from netlink attribute to metrics entry

- the convert metrics call is done in ip6_route_info_create simplifying
  the route add path
  + fib6_commit_metrics and fib6_copy_metrics and the temporary
    mx6_config are no longer needed

- add fib6_metric_set helper to change the value of a metric in the
  fib entry since dst_metric_set can no longer be used

- cow_metrics for IPv6 can drop to dst_cow_metrics_generic

- rt6_dst_from_metrics_check is no longer needed

- rt6_fill_node needs the FIB entry and dst as separate arguments to
  keep compatibility with existing output. Current dst address is
  renamed to dest.
  (to be consistent with IPv4 rt6_fill_node really should be split
  into 2 functions similar to fib_dump_info and rt_fill_info)

- rt6_fill_node no longer needs the temporary metrics variable

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h |  17 ++--
 net/core/dst.c        |   1 +
 net/ipv6/ip6_fib.c    |  67 +++++--------
 net/ipv6/ndisc.c      |  10 +-
 net/ipv6/route.c      | 262 +++++++++++++++++++-------------------------------
 5 files changed, 134 insertions(+), 223 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index f0a88370ba95..1f8dc9d12abb 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -94,11 +94,6 @@ struct fib6_gc_args {
 #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
 #endif
 
-struct mx6_config {
-	const u32 *mx;
-	DECLARE_BITMAP(mx_valid, RTAX_MAX);
-};
-
 /*
  *	routing information
  *
@@ -176,7 +171,6 @@ struct rt6_info {
 	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
 
 	u32				rt6i_metric;
-	u32				rt6i_pmtu;
 	/* more non-fragment space at head required */
 	unsigned short			rt6i_nfheader_len;
 	u8				rt6i_protocol;
@@ -185,6 +179,8 @@ struct rt6_info {
 					should_flush:1,
 					unused:6;
 
+	struct dst_metrics		*fib6_metrics;
+#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
 	struct fib6_nh			fib6_nh;
 };
 
@@ -390,8 +386,7 @@ void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
 		    void *arg);
 
 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
-	     struct nl_info *info, struct mx6_config *mxc,
-	     struct netlink_ext_ack *extack);
+	     struct nl_info *info, struct netlink_ext_ack *extack);
 int fib6_del(struct rt6_info *rt, struct nl_info *info);
 
 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
@@ -420,6 +415,12 @@ int fib6_tables_dump(struct net *net, struct notifier_block *nb);
 void fib6_update_sernum(struct net *net, struct rt6_info *rt);
 void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt);
 
+void fib6_metric_set(struct rt6_info *f6i, int metric, u32 val);
+static inline bool fib6_metric_locked(struct rt6_info *f6i, int metric)
+{
+	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
+}
+
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 int fib6_rules_init(void);
 void fib6_rules_cleanup(void);
diff --git a/net/core/dst.c b/net/core/dst.c
index 007aa0b08291..2d9b37f8944a 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -58,6 +58,7 @@ const struct dst_metrics dst_default_metrics = {
 	 */
 	.refcnt = REFCOUNT_INIT(1),
 };
+EXPORT_SYMBOL(dst_default_metrics);
 
 void dst_init(struct dst_entry *dst, struct dst_ops *ops,
 	      struct net_device *dev, int initial_ref, int initial_obsolete,
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 7326edab2acb..f3f284c3a486 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -578,6 +578,24 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 	return res;
 }
 
+void fib6_metric_set(struct rt6_info *f6i, int metric, u32 val)
+{
+	if (!f6i)
+		return;
+
+	if (f6i->fib6_metrics == &dst_default_metrics) {
+		struct dst_metrics *p = kzalloc(sizeof(*p), GFP_ATOMIC);
+
+		if (!p)
+			return;
+
+		refcount_set(&p->refcnt, 1);
+		f6i->fib6_metrics = p;
+	}
+
+	f6i->fib6_metrics->metrics[metric - 1] = val;
+}
+
 /*
  *	Routing Table
  *
@@ -801,38 +819,6 @@ static struct fib6_node *fib6_add_1(struct net *net,
 	return ln;
 }
 
-static void fib6_copy_metrics(u32 *mp, const struct mx6_config *mxc)
-{
-	int i;
-
-	for (i = 0; i < RTAX_MAX; i++) {
-		if (test_bit(i, mxc->mx_valid))
-			mp[i] = mxc->mx[i];
-	}
-}
-
-static int fib6_commit_metrics(struct dst_entry *dst, struct mx6_config *mxc)
-{
-	if (!mxc->mx)
-		return 0;
-
-	if (dst->flags & DST_HOST) {
-		u32 *mp = dst_metrics_write_ptr(dst);
-
-		if (unlikely(!mp))
-			return -ENOMEM;
-
-		fib6_copy_metrics(mp, mxc);
-	} else {
-		dst_init_metrics(dst, mxc->mx, false);
-
-		/* We've stolen mx now. */
-		mxc->mx = NULL;
-	}
-
-	return 0;
-}
-
 static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
 			  struct net *net)
 {
@@ -866,7 +852,7 @@ static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
  */
 
 static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
-			    struct nl_info *info, struct mx6_config *mxc,
+			    struct nl_info *info,
 			    struct netlink_ext_ack *extack)
 {
 	struct rt6_info *leaf = rcu_dereference_protected(fn->leaf,
@@ -881,7 +867,6 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 	int found = 0;
 	bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
 	u16 nlflags = NLM_F_EXCL;
-	int err;
 
 	if (info->nlh && (info->nlh->nlmsg_flags & NLM_F_APPEND))
 		nlflags |= NLM_F_APPEND;
@@ -923,7 +908,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 					rt6_clean_expires(iter);
 				else
 					rt6_set_expires(iter, rt->dst.expires);
-				iter->rt6i_pmtu = rt->rt6i_pmtu;
+				fib6_metric_set(iter, RTAX_MTU, rt->fib6_pmtu);
 				return -EEXIST;
 			}
 			/* If we have the same destination and the same metric,
@@ -1002,9 +987,6 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 
 add:
 		nlflags |= NLM_F_CREATE;
-		err = fib6_commit_metrics(&rt->dst, mxc);
-		if (err)
-			return err;
 
 		rcu_assign_pointer(rt->rt6_next, iter);
 		atomic_inc(&rt->rt6i_ref);
@@ -1031,10 +1013,6 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 			return -ENOENT;
 		}
 
-		err = fib6_commit_metrics(&rt->dst, mxc);
-		if (err)
-			return err;
-
 		atomic_inc(&rt->rt6i_ref);
 		rcu_assign_pointer(rt->rt6i_node, fn);
 		rt->rt6_next = iter->rt6_next;
@@ -1127,8 +1105,7 @@ void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt)
  */
 
 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
-	     struct nl_info *info, struct mx6_config *mxc,
-	     struct netlink_ext_ack *extack)
+	     struct nl_info *info, struct netlink_ext_ack *extack)
 {
 	struct fib6_table *table = rt->rt6i_table;
 	struct fib6_node *fn, *pn = NULL;
@@ -1236,7 +1213,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 	}
 #endif
 
-	err = fib6_add_rt2node(fn, rt, info, mxc, extack);
+	err = fib6_add_rt2node(fn, rt, info, extack);
 	if (!err) {
 		__fib6_update_sernum_upto_root(rt, sernum);
 		fib6_start_gc(info->nl_net, rt);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 4c6444a16d92..33768b72f674 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1323,9 +1323,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	    ra_msg->icmph.icmp6_hop_limit) {
 		if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
 			in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
-			if (rt)
-				dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
-					       ra_msg->icmph.icmp6_hop_limit);
+			fib6_metric_set(rt, RTAX_HOPLIMIT,
+					ra_msg->icmph.icmp6_hop_limit);
 		} else {
 			ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
 		}
@@ -1477,10 +1476,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 			ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
 		} else if (in6_dev->cnf.mtu6 != mtu) {
 			in6_dev->cnf.mtu6 = mtu;
-
-			if (rt)
-				dst_metric_set(&rt->dst, RTAX_MTU, mtu);
-
+			fib6_metric_set(rt, RTAX_MTU, mtu);
 			rt6_mtu_change(skb->dev, mtu);
 		}
 	}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index adff60c07ae9..0f290c75905e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -96,12 +96,11 @@ static void		ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 					   struct sk_buff *skb, u32 mtu);
 static void		rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
 					struct sk_buff *skb);
-static void		rt6_dst_from_metrics_check(struct rt6_info *rt);
 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
 static size_t rt6_nlmsg_size(struct rt6_info *rt);
-static int rt6_fill_node(struct net *net,
-			 struct sk_buff *skb, struct rt6_info *rt,
-			 struct in6_addr *dst, struct in6_addr *src,
+static int rt6_fill_node(struct net *net, struct sk_buff *skb,
+			 struct rt6_info *rt, struct dst_entry *dst,
+			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
 			 unsigned int flags);
 static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
@@ -183,23 +182,6 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
 	}
 }
 
-static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
-{
-	return dst_metrics_write_ptr(&rt->from->dst);
-}
-
-static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
-{
-	struct rt6_info *rt = (struct rt6_info *)dst;
-
-	if (rt->rt6i_flags & RTF_PCPU)
-		return rt6_pcpu_cow_metrics(rt);
-	else if (rt->rt6i_flags & RTF_CACHE)
-		return NULL;
-	else
-		return dst_cow_metrics_generic(dst, old);
-}
-
 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
 					     struct sk_buff *skb,
 					     const void *daddr)
@@ -249,7 +231,7 @@ static struct dst_ops ip6_dst_ops_template = {
 	.check			=	ip6_dst_check,
 	.default_advmss		=	ip6_default_advmss,
 	.mtu			=	ip6_mtu,
-	.cow_metrics		=	ipv6_cow_metrics,
+	.cow_metrics		=	dst_cow_metrics_generic,
 	.destroy		=	ip6_dst_destroy,
 	.ifdown			=	ip6_dst_ifdown,
 	.negative_advice	=	ip6_negative_advice,
@@ -353,6 +335,7 @@ static void rt6_info_init(struct rt6_info *rt)
 	memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
 	INIT_LIST_HEAD(&rt->rt6i_siblings);
 	INIT_LIST_HEAD(&rt->rt6i_uncached);
+	rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
 }
 
 /* allocate dst with ip6_dst_ops */
@@ -395,6 +378,7 @@ static void ip6_dst_destroy(struct dst_entry *dst)
 	struct rt6_exception_bucket *bucket;
 	struct rt6_info *from = rt->from;
 	struct inet6_dev *idev;
+	struct dst_metrics *m;
 
 	dst_destroy_metrics_generic(dst);
 	free_percpu(rt->rt6i_pcpu);
@@ -411,6 +395,10 @@ static void ip6_dst_destroy(struct dst_entry *dst)
 		kfree(bucket);
 	}
 
+	m = rt->fib6_metrics;
+	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
+		kfree(m);
+
 	rt->from = NULL;
 	dst_release(&from->dst);
 }
@@ -996,7 +984,11 @@ static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 	rt->rt6i_flags &= ~RTF_EXPIRES;
 	dst_hold(&from->dst);
 	rt->from = from;
-	dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
+	dst_init_metrics(&rt->dst, from->fib6_metrics->metrics, true);
+	if (from->fib6_metrics != &dst_default_metrics) {
+		rt->dst._metrics |= DST_METRICS_REFCOUNTED;
+		refcount_inc(&from->fib6_metrics->refcnt);
+	}
 }
 
 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
@@ -1137,7 +1129,6 @@ EXPORT_SYMBOL(rt6_lookup);
  */
 
 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
-			struct mx6_config *mxc,
 			struct netlink_ext_ack *extack)
 {
 	int err;
@@ -1145,7 +1136,7 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
 
 	table = rt->rt6i_table;
 	spin_lock_bh(&table->tb6_lock);
-	err = fib6_add(&table->tb6_root, rt, info, mxc, extack);
+	err = fib6_add(&table->tb6_root, rt, info, extack);
 	spin_unlock_bh(&table->tb6_lock);
 
 	return err;
@@ -1154,11 +1145,10 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
 int ip6_ins_rt(struct net *net, struct rt6_info *rt)
 {
 	struct nl_info info = {	.nl_net = net, };
-	struct mx6_config mxc = { .mx = NULL, };
 
 	/* Hold dst to account for the reference from the fib6 tree */
 	dst_hold(&rt->dst);
-	return __ip6_ins_rt(rt, &info, &mxc, NULL);
+	return __ip6_ins_rt(rt, &info, NULL);
 }
 
 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
@@ -1229,8 +1219,8 @@ static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
 	p = this_cpu_ptr(rt->rt6i_pcpu);
 	pcpu_rt = *p;
 
-	if (pcpu_rt && ip6_hold_safe(NULL, &pcpu_rt, false))
-		rt6_dst_from_metrics_check(pcpu_rt);
+	if (pcpu_rt)
+		ip6_hold_safe(NULL, &pcpu_rt, false);
 
 	return pcpu_rt;
 }
@@ -1251,7 +1241,6 @@ static struct rt6_info *rt6_make_pcpu_route(struct net *net,
 	prev = cmpxchg(p, NULL, pcpu_rt);
 	BUG_ON(prev);
 
-	rt6_dst_from_metrics_check(pcpu_rt);
 	return pcpu_rt;
 }
 
@@ -1381,6 +1370,16 @@ __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
 	return NULL;
 }
 
+static unsigned int fib6_mtu(const struct rt6_info *rt)
+{
+	unsigned int mtu;
+
+	mtu = rt->fib6_pmtu ? : rt->rt6i_idev->cnf.mtu6;
+	mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+
+	return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu);
+}
+
 static int rt6_insert_exception(struct rt6_info *nrt,
 				struct rt6_info *ort)
 {
@@ -1433,7 +1432,7 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	 * Only insert this exception route if its mtu
 	 * is less than ort's mtu value.
 	 */
-	if (nrt->rt6i_pmtu >= dst_mtu(&ort->dst)) {
+	if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(ort)) {
 		err = -EINVAL;
 		goto out;
 	}
@@ -1643,13 +1642,15 @@ static void rt6_exceptions_update_pmtu(struct rt6_info *rt, int mtu)
 		for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
 			hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
 				struct rt6_info *entry = rt6_ex->rt6i;
+				u32 dst_mtu = dst_metric(&entry->dst, RTAX_MTU);
+
 				/* For RTF_CACHE with rt6i_pmtu == 0
 				 * (i.e. a redirected route),
-				 * the metrics of its rt->dst.from has already
+				 * the metrics of its rt->from has already
 				 * been updated.
 				 */
-				if (entry->rt6i_pmtu && entry->rt6i_pmtu > mtu)
-					entry->rt6i_pmtu = mtu;
+				if (dst_mtu && dst_mtu > mtu)
+					dst_metric_set(&entry->dst, RTAX_MTU, mtu);
 			}
 			bucket++;
 		}
@@ -1815,10 +1816,9 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		trace_fib6_table_lookup(net, rt, table, fl6);
 		return rt;
 	} else if (rt->rt6i_flags & RTF_CACHE) {
-		if (ip6_hold_safe(net, &rt, true)) {
+		if (ip6_hold_safe(net, &rt, true))
 			dst_use_noref(&rt->dst, jiffies);
-			rt6_dst_from_metrics_check(rt);
-		}
+
 		rcu_read_unlock();
 		trace_fib6_table_lookup(net, rt, table, fl6);
 		return rt;
@@ -2118,13 +2118,6 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
  *	Destination cache support functions
  */
 
-static void rt6_dst_from_metrics_check(struct rt6_info *rt)
-{
-	if (rt->from &&
-	    dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(&rt->from->dst))
-		dst_init_metrics(&rt->dst, dst_metrics_ptr(&rt->from->dst), true);
-}
-
 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
 {
 	u32 rt_cookie = 0;
@@ -2159,8 +2152,6 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
 	 * into this function always.
 	 */
 
-	rt6_dst_from_metrics_check(rt);
-
 	if (rt->rt6i_flags & RTF_PCPU ||
 	    (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
 		return rt6_dst_from_check(rt, cookie);
@@ -2213,8 +2204,8 @@ static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
 {
 	struct net *net = dev_net(rt->dst.dev);
 
+	dst_metric_set(&rt->dst, RTAX_MTU, mtu);
 	rt->rt6i_flags |= RTF_MODIFIED;
-	rt->rt6i_pmtu = mtu;
 	rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
 }
 
@@ -2260,10 +2251,10 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
 	} else if (daddr) {
 		struct rt6_info *nrt6;
 
-		nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
+		nrt6 = ip6_rt_cache_alloc(rt6->from, daddr, saddr);
 		if (nrt6) {
 			rt6_do_update_pmtu(nrt6, mtu);
-			if (rt6_insert_exception(nrt6, rt6))
+			if (rt6_insert_exception(nrt6, rt6->from))
 				dst_release_immediate(&nrt6->dst);
 		}
 	}
@@ -2487,12 +2478,8 @@ static unsigned int ip6_default_advmss(const struct dst_entry *dst)
 
 static unsigned int ip6_mtu(const struct dst_entry *dst)
 {
-	const struct rt6_info *rt = (const struct rt6_info *)dst;
-	unsigned int mtu = rt->rt6i_pmtu;
 	struct inet6_dev *idev;
-
-	if (mtu)
-		goto out;
+	unsigned int mtu;
 
 	mtu = dst_metric_raw(dst, RTAX_MTU);
 	if (mtu)
@@ -2576,60 +2563,24 @@ static int ip6_dst_gc(struct dst_ops *ops)
 	return entries > rt_max_size;
 }
 
-static int ip6_convert_metrics(struct mx6_config *mxc,
-			       const struct fib6_config *cfg)
+static int ip6_convert_metrics(struct net *net, struct rt6_info *rt,
+			       struct fib6_config *cfg)
 {
-	struct net *net = cfg->fc_nlinfo.nl_net;
-	bool ecn_ca = false;
-	struct nlattr *nla;
-	int remaining;
-	u32 *mp;
-
-	if (!cfg->fc_mx)
-		return 0;
-
-	mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
-	if (unlikely(!mp))
-		return -ENOMEM;
-
-	nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
-		int type = nla_type(nla);
-		u32 val;
-
-		if (!type)
-			continue;
-		if (unlikely(type > RTAX_MAX))
-			goto err;
-
-		if (type == RTAX_CC_ALGO) {
-			char tmp[TCP_CA_NAME_MAX];
+	int err = 0;
 
-			nla_strlcpy(tmp, nla, sizeof(tmp));
-			val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
-			if (val == TCP_CA_UNSPEC)
-				goto err;
-		} else {
-			val = nla_get_u32(nla);
-		}
-		if (type == RTAX_HOPLIMIT && val > 255)
-			val = 255;
-		if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
-			goto err;
+	if (cfg->fc_mx) {
+		rt->fib6_metrics = kzalloc(sizeof(*rt->fib6_metrics),
+					   GFP_KERNEL);
+		if (unlikely(!rt->fib6_metrics))
+			return -ENOMEM;
 
-		mp[type - 1] = val;
-		__set_bit(type - 1, mxc->mx_valid);
-	}
+		refcount_set(&rt->fib6_metrics->refcnt, 1);
 
-	if (ecn_ca) {
-		__set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
-		mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
+		err = ip_metrics_convert(net, cfg->fc_mx, cfg->fc_mx_len,
+					 rt->fib6_metrics->metrics);
 	}
 
-	mxc->mx = mp;
-	return 0;
- err:
-	kfree(mp);
-	return -EINVAL;
+	return err;
 }
 
 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
@@ -2909,6 +2860,10 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		goto out;
 	}
 
+	err = ip6_convert_metrics(net, rt, cfg);
+	if (err < 0)
+		goto out;
+
 	if (cfg->fc_flags & RTF_EXPIRES)
 		rt6_set_expires(rt, jiffies +
 				clock_t_to_jiffies(cfg->fc_expires));
@@ -3026,32 +2981,16 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	return ERR_PTR(err);
 }
 
-int ip6_route_add(struct fib6_config *cfg,
-		  struct netlink_ext_ack *extack)
+int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack)
 {
-	struct mx6_config mxc = { .mx = NULL, };
 	struct rt6_info *rt;
 	int err;
 
 	rt = ip6_route_info_create(cfg, extack);
-	if (IS_ERR(rt)) {
-		err = PTR_ERR(rt);
-		rt = NULL;
-		goto out;
-	}
+	if (IS_ERR(rt))
+		return PTR_ERR(rt);
 
-	err = ip6_convert_metrics(&mxc, cfg);
-	if (err)
-		goto out;
-
-	err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack);
-
-	kfree(mxc.mx);
-
-	return err;
-out:
-	if (rt)
-		dst_release_immediate(&rt->dst);
+	err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
 
 	return err;
 }
@@ -3105,7 +3044,7 @@ static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
 		if (skb) {
 			u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
 
-			if (rt6_fill_node(net, skb, rt,
+			if (rt6_fill_node(net, skb, rt, NULL,
 					  NULL, NULL, 0, RTM_DELROUTE,
 					  info->portid, seq, 0) < 0) {
 				kfree_skb(skb);
@@ -3296,7 +3235,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 	 * a cached route because rt6_insert_exception() will
 	 * takes care of it
 	 */
-	if (rt6_insert_exception(nrt, rt)) {
+	if (rt6_insert_exception(nrt, rt->from)) {
 		dst_release_immediate(&nrt->dst);
 		goto out;
 	}
@@ -3973,15 +3912,15 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
 	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
 	   PMTU discovery.
 	 */
-	if (rt->fib6_nh.nh_dev == arg->dev &&
-	    dst_metric_raw(&rt->dst, RTAX_MTU) &&
-	    !dst_metric_locked(&rt->dst, RTAX_MTU)) {
+	if (rt->fib6_nh.nh_dev == arg->dev && rt->fib6_pmtu &&
+	    !fib6_metric_locked(rt, RTAX_MTU)) {
+		u32 mtu = rt->fib6_pmtu;
+
+		if (mtu >= arg->mtu ||
+		    (mtu < arg->mtu && mtu == idev->cnf.mtu6))
+			fib6_metric_set(rt, RTAX_MTU, arg->mtu);
+
 		spin_lock_bh(&rt6_exception_lock);
-		if (dst_mtu(&rt->dst) >= arg->mtu ||
-		    (dst_mtu(&rt->dst) < arg->mtu &&
-		     dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
-			dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
-		}
 		rt6_exceptions_update_pmtu(rt, arg->mtu);
 		spin_unlock_bh(&rt6_exception_lock);
 	}
@@ -4142,7 +4081,6 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
 struct rt6_nh {
 	struct rt6_info *rt6_info;
 	struct fib6_config r_cfg;
-	struct mx6_config mxc;
 	struct list_head next;
 };
 
@@ -4157,7 +4095,8 @@ static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
 	}
 }
 
-static int ip6_route_info_append(struct list_head *rt6_nh_list,
+static int ip6_route_info_append(struct net *net,
+				 struct list_head *rt6_nh_list,
 				 struct rt6_info *rt, struct fib6_config *r_cfg)
 {
 	struct rt6_nh *nh;
@@ -4173,7 +4112,7 @@ static int ip6_route_info_append(struct list_head *rt6_nh_list,
 	if (!nh)
 		return -ENOMEM;
 	nh->rt6_info = rt;
-	err = ip6_convert_metrics(&nh->mxc, r_cfg);
+	err = ip6_convert_metrics(net, rt, r_cfg);
 	if (err) {
 		kfree(nh);
 		return err;
@@ -4263,7 +4202,8 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 
 		rt->fib6_nh.nh_weight = rtnh->rtnh_hops + 1;
 
-		err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
+		err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
+					    rt, &r_cfg);
 		if (err) {
 			dst_release_immediate(&rt->dst);
 			goto cleanup;
@@ -4281,7 +4221,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 	err_nh = NULL;
 	list_for_each_entry(nh, &rt6_nh_list, next) {
 		rt_last = nh->rt6_info;
-		err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack);
+		err = __ip6_ins_rt(nh->rt6_info, info, extack);
 		/* save reference to first route for notification */
 		if (!rt_notif && !err)
 			rt_notif = nh->rt6_info;
@@ -4330,7 +4270,6 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 	list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
 		if (nh->rt6_info)
 			dst_release_immediate(&nh->rt6_info->dst);
-		kfree(nh->mxc.mx);
 		list_del(&nh->next);
 		kfree(nh);
 	}
@@ -4504,16 +4443,15 @@ static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
 	return -EMSGSIZE;
 }
 
-static int rt6_fill_node(struct net *net,
-			 struct sk_buff *skb, struct rt6_info *rt,
-			 struct in6_addr *dst, struct in6_addr *src,
+static int rt6_fill_node(struct net *net, struct sk_buff *skb,
+			 struct rt6_info *rt, struct dst_entry *dst,
+			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
 			 unsigned int flags)
 {
-	u32 metrics[RTAX_MAX];
 	struct rtmsg *rtm;
 	struct nlmsghdr *nlh;
-	long expires;
+	long expires = 0;
 	u32 table;
 
 	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
@@ -4541,8 +4479,8 @@ static int rt6_fill_node(struct net *net,
 	if (rt->rt6i_flags & RTF_CACHE)
 		rtm->rtm_flags |= RTM_F_CLONED;
 
-	if (dst) {
-		if (nla_put_in6_addr(skb, RTA_DST, dst))
+	if (dest) {
+		if (nla_put_in6_addr(skb, RTA_DST, dest))
 			goto nla_put_failure;
 		rtm->rtm_dst_len = 128;
 	} else if (rtm->rtm_dst_len)
@@ -4570,9 +4508,9 @@ static int rt6_fill_node(struct net *net,
 #endif
 			if (nla_put_u32(skb, RTA_IIF, iif))
 				goto nla_put_failure;
-	} else if (dst) {
+	} else if (dest) {
 		struct in6_addr saddr_buf;
-		if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
+		if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
 		    nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
 			goto nla_put_failure;
 	}
@@ -4584,10 +4522,7 @@ static int rt6_fill_node(struct net *net,
 			goto nla_put_failure;
 	}
 
-	memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
-	if (rt->rt6i_pmtu)
-		metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
-	if (rtnetlink_put_metrics(skb, metrics) < 0)
+	if (rtnetlink_put_metrics(skb, rt->fib6_metrics->metrics) < 0)
 		goto nla_put_failure;
 
 	if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
@@ -4619,9 +4554,10 @@ static int rt6_fill_node(struct net *net,
 			goto nla_put_failure;
 	}
 
-	expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
+	if (rt->rt6i_flags & RTF_EXPIRES && dst)
+		expires = dst->expires - jiffies;
 
-	if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
+	if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
 		goto nla_put_failure;
 
 	if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
@@ -4655,10 +4591,9 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg)
 		}
 	}
 
-	return rt6_fill_node(net,
-		     arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
-		     NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
-		     NLM_F_MULTI);
+	return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0,
+			     RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid,
+			     arg->cb->nlh->nlmsg_seq, NLM_F_MULTI);
 }
 
 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
@@ -4772,13 +4707,14 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 
 	skb_dst_set(skb, &rt->dst);
 	if (fibmatch)
-		err = rt6_fill_node(net, skb, rt, NULL, NULL, iif,
+		err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, iif,
 				    RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
 				    nlh->nlmsg_seq, 0);
 	else
-		err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
-				    RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
-				    nlh->nlmsg_seq, 0);
+		err = rt6_fill_node(net, skb, rt, dst, &fl6.daddr, &fl6.saddr,
+				    iif, RTM_NEWROUTE,
+				    NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
+				    0);
 	if (err < 0) {
 		kfree_skb(skb);
 		goto errout;
@@ -4804,8 +4740,8 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
 	if (!skb)
 		goto errout;
 
-	err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
-				event, info->portid, seq, nlm_flags);
+	err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
+			    event, info->portid, seq, nlm_flags);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
-- 
2.11.0

[PATCH RFC v2 net-next 11/21] net/ipv6: move expires into rt6_info

[David Ahern]

Add expires to rt6_info for FIB entries, and add fib6 helpers to
manage it. Data path use of dst.expires remains.

The transition is fairly straightforward: when working with fib entries,
rt->dst.expires is just rt->expires, rt6_clean_expires is replaced with
fib6_clean_expires, rt6_set_expires becomes fib6_set_expires, and
rt6_check_expired becomes fib6_check_expired, where the fib6 versions
are added by this patch.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h | 27 +++++++++++++++++++++++----
 net/ipv6/addrconf.c   |  6 +++---
 net/ipv6/ip6_fib.c    |  8 ++++----
 net/ipv6/ndisc.c      |  2 +-
 net/ipv6/route.c      | 20 +++++++++++---------
 5 files changed, 42 insertions(+), 21 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 1f8dc9d12abb..c73b985734f5 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -179,6 +179,7 @@ struct rt6_info {
 					should_flush:1,
 					unused:6;
 
+	unsigned long			expires;
 	struct dst_metrics		*fib6_metrics;
 #define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
 	struct fib6_nh			fib6_nh;
@@ -197,6 +198,26 @@ static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 	return ((struct rt6_info *)dst)->rt6i_idev;
 }
 
+static inline void fib6_clean_expires(struct rt6_info *f6i)
+{
+	f6i->rt6i_flags &= ~RTF_EXPIRES;
+	f6i->expires = 0;
+}
+
+static inline void fib6_set_expires(struct rt6_info *f6i,
+				    unsigned long expires)
+{
+	f6i->expires = expires;
+	f6i->rt6i_flags |= RTF_EXPIRES;
+}
+
+static inline bool fib6_check_expired(const struct rt6_info *f6i)
+{
+	if (f6i->rt6i_flags & RTF_EXPIRES)
+		return time_after(jiffies, f6i->expires);
+	return false;
+}
+
 static inline void rt6_clean_expires(struct rt6_info *rt)
 {
 	rt->rt6i_flags &= ~RTF_EXPIRES;
@@ -211,11 +232,9 @@ static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
 
 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
 {
-	struct rt6_info *rt;
+	if (!(rt0->rt6i_flags & RTF_EXPIRES) && rt0->from)
+		rt0->dst.expires = rt0->from->expires;
 
-	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); rt = rt->from);
-	if (rt && rt != rt0)
-		rt0->dst.expires = rt->dst.expires;
 	dst_set_expires(&rt0->dst, timeout);
 	rt0->rt6i_flags |= RTF_EXPIRES;
 }
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 7d92c6e48d2e..23834864adb5 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1202,7 +1202,7 @@ cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_r
 			ip6_del_rt(dev_net(ifp->idev->dev), rt);
 		else {
 			if (!(rt->rt6i_flags & RTF_EXPIRES))
-				rt6_set_expires(rt, expires);
+				fib6_set_expires(rt, expires);
 			ip6_rt_put(rt);
 		}
 	}
@@ -2685,9 +2685,9 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 				rt = NULL;
 			} else if (addrconf_finite_timeout(rt_expires)) {
 				/* not infinity */
-				rt6_set_expires(rt, jiffies + rt_expires);
+				fib6_set_expires(rt, jiffies + rt_expires);
 			} else {
-				rt6_clean_expires(rt);
+				fib6_clean_expires(rt);
 			}
 		} else if (valid_lft) {
 			clock_t expires = 0;
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index f3f284c3a486..70eca9cb551f 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -905,9 +905,9 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 				if (!(iter->rt6i_flags & RTF_EXPIRES))
 					return -EEXIST;
 				if (!(rt->rt6i_flags & RTF_EXPIRES))
-					rt6_clean_expires(iter);
+					fib6_clean_expires(iter);
 				else
-					rt6_set_expires(iter, rt->dst.expires);
+					fib6_set_expires(iter, rt->expires);
 				fib6_metric_set(iter, RTAX_MTU, rt->fib6_pmtu);
 				return -EEXIST;
 			}
@@ -1994,8 +1994,8 @@ static int fib6_age(struct rt6_info *rt, void *arg)
 	 *	Routes are expired even if they are in use.
 	 */
 
-	if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) {
-		if (time_after(now, rt->dst.expires)) {
+	if (rt->rt6i_flags & RTF_EXPIRES && rt->expires) {
+		if (time_after(now, rt->expires)) {
 			RT6_TRACE("expiring %p\n", rt);
 			return -1;
 		}
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 33768b72f674..848f518d48d4 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1318,7 +1318,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	}
 
 	if (rt)
-		rt6_set_expires(rt, jiffies + (HZ * lifetime));
+		fib6_set_expires(rt, jiffies + (HZ * lifetime));
 	if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
 	    ra_msg->icmph.icmp6_hop_limit) {
 		if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0f290c75905e..fc3ddcbe8899 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -435,7 +435,7 @@ static bool rt6_check_expired(const struct rt6_info *rt)
 			return true;
 	} else if (rt->from) {
 		return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
-			rt6_check_expired(rt->from);
+			fib6_check_expired(rt->from);
 	}
 	return false;
 }
@@ -687,7 +687,7 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 	    !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
 		goto out;
 
-	if (rt6_check_expired(rt))
+	if (fib6_check_expired(rt))
 		goto out;
 
 	m = rt6_score_route(rt, oif, strict);
@@ -871,9 +871,9 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 
 	if (rt) {
 		if (!addrconf_finite_timeout(lifetime))
-			rt6_clean_expires(rt);
+			fib6_clean_expires(rt);
 		else
-			rt6_set_expires(rt, jiffies + HZ * lifetime);
+			fib6_set_expires(rt, jiffies + HZ * lifetime);
 
 		ip6_rt_put(rt);
 	}
@@ -2339,7 +2339,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 	for_each_fib6_node_rt_rcu(fn) {
 		if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
 			continue;
-		if (rt6_check_expired(rt))
+		if (fib6_check_expired(rt))
 			continue;
 		if (rt->rt6i_flags & RTF_REJECT)
 			break;
@@ -2865,10 +2865,10 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		goto out;
 
 	if (cfg->fc_flags & RTF_EXPIRES)
-		rt6_set_expires(rt, jiffies +
+		fib6_set_expires(rt, jiffies +
 				clock_t_to_jiffies(cfg->fc_expires));
 	else
-		rt6_clean_expires(rt);
+		fib6_clean_expires(rt);
 
 	if (cfg->fc_protocol == RTPROT_UNSPEC)
 		cfg->fc_protocol = RTPROT_BOOT;
@@ -4554,8 +4554,10 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 			goto nla_put_failure;
 	}
 
-	if (rt->rt6i_flags & RTF_EXPIRES && dst)
-		expires = dst->expires - jiffies;
+	if (rt->rt6i_flags & RTF_EXPIRES) {
+		expires = dst ? dst->expires : rt->expires;
+		expires -= jiffies;
+	}
 
 	if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
 		goto nla_put_failure;
-- 
2.11.0

[PATCH RFC v2 net-next 12/21] net/ipv6: Add fib6_null_entry

[David Ahern]

ip6_null_entry will stay a dst based return for lookups that fail to
match an entry.

Add a new fib6_null_entry which constitutes the root node and leafs
for fibs. Replace existing references to ip6_null_entry with the
new fib6_null_entry when dealing with FIBs.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/netns/ipv6.h |  3 ++-
 net/ipv6/ip6_fib.c       | 26 ++++++++++----------
 net/ipv6/route.c         | 62 +++++++++++++++++++++++++++++++++---------------
 3 files changed, 58 insertions(+), 33 deletions(-)

diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 5b51110435fc..7996b19c8a6d 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -60,7 +60,8 @@ struct netns_ipv6 {
 #endif
 	struct xt_table		*ip6table_nat;
 #endif
-	struct rt6_info         *ip6_null_entry;
+	struct rt6_info         *fib6_null_entry;
+	struct rt6_info		*ip6_null_entry;
 	struct rt6_statistics   *rt6_stats;
 	struct timer_list       ip6_fib_timer;
 	struct hlist_head       *fib_table_hash;
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 70eca9cb551f..90df1589a6c2 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -231,7 +231,7 @@ static struct fib6_table *fib6_alloc_table(struct net *net, u32 id)
 	if (table) {
 		table->tb6_id = id;
 		rcu_assign_pointer(table->tb6_root.leaf,
-				   net->ipv6.ip6_null_entry);
+				   net->ipv6.fib6_null_entry);
 		table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
 		inet_peer_base_init(&table->tb6_peers);
 	}
@@ -369,7 +369,7 @@ struct fib6_dump_arg {
 
 static void fib6_rt_dump(struct rt6_info *rt, struct fib6_dump_arg *arg)
 {
-	if (rt == arg->net->ipv6.ip6_null_entry)
+	if (rt == arg->net->ipv6.fib6_null_entry)
 		return;
 	call_fib6_entry_notifier(arg->nb, arg->net, FIB_EVENT_ENTRY_ADD, rt);
 }
@@ -658,7 +658,7 @@ static struct fib6_node *fib6_add_1(struct net *net,
 			/* remove null_entry in the root node */
 			} else if (fn->fn_flags & RTN_TL_ROOT &&
 				   rcu_access_pointer(fn->leaf) ==
-				   net->ipv6.ip6_null_entry) {
+				   net->ipv6.fib6_null_entry) {
 				RCU_INIT_POINTER(fn->leaf, NULL);
 			}
 
@@ -1162,9 +1162,9 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 			if (!sfn)
 				goto failure;
 
-			atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref);
+			atomic_inc(&info->nl_net->ipv6.fib6_null_entry->rt6i_ref);
 			rcu_assign_pointer(sfn->leaf,
-					   info->nl_net->ipv6.ip6_null_entry);
+					   info->nl_net->ipv6.fib6_null_entry);
 			sfn->fn_flags = RTN_ROOT;
 
 			/* Now add the first leaf node to new subtree */
@@ -1203,7 +1203,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 			if (fn->fn_flags & RTN_TL_ROOT) {
 				/* put back null_entry for root node */
 				rcu_assign_pointer(fn->leaf,
-					    info->nl_net->ipv6.ip6_null_entry);
+					    info->nl_net->ipv6.fib6_null_entry);
 			} else {
 				atomic_inc(&rt->rt6i_ref);
 				rcu_assign_pointer(fn->leaf, rt);
@@ -1242,7 +1242,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 				if (!pn_leaf) {
 					WARN_ON(!pn_leaf);
 					pn_leaf =
-					    info->nl_net->ipv6.ip6_null_entry;
+					    info->nl_net->ipv6.fib6_null_entry;
 				}
 #endif
 				atomic_inc(&pn_leaf->rt6i_ref);
@@ -1485,7 +1485,7 @@ static struct rt6_info *fib6_find_prefix(struct net *net,
 	struct fib6_node *child_left, *child_right;
 
 	if (fn->fn_flags & RTN_ROOT)
-		return net->ipv6.ip6_null_entry;
+		return net->ipv6.fib6_null_entry;
 
 	while (fn) {
 		child_left = rcu_dereference_protected(fn->left,
@@ -1522,7 +1522,7 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 
 	/* Set fn->leaf to null_entry for root node. */
 	if (fn->fn_flags & RTN_TL_ROOT) {
-		rcu_assign_pointer(fn->leaf, net->ipv6.ip6_null_entry);
+		rcu_assign_pointer(fn->leaf, net->ipv6.fib6_null_entry);
 		return fn;
 	}
 
@@ -1567,7 +1567,7 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 #if RT6_DEBUG >= 2
 			if (!new_fn_leaf) {
 				WARN_ON(!new_fn_leaf);
-				new_fn_leaf = net->ipv6.ip6_null_entry;
+				new_fn_leaf = net->ipv6.fib6_null_entry;
 			}
 #endif
 			atomic_inc(&new_fn_leaf->rt6i_ref);
@@ -1717,7 +1717,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
 		return -ENOENT;
 	}
 #endif
-	if (!fn || rt == net->ipv6.ip6_null_entry)
+	if (!fn || rt == net->ipv6.fib6_null_entry)
 		return -ENOENT;
 
 	WARN_ON(!(fn->fn_flags & RTN_RTINFO));
@@ -2078,7 +2078,7 @@ static int __net_init fib6_net_init(struct net *net)
 
 	net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN;
 	rcu_assign_pointer(net->ipv6.fib6_main_tbl->tb6_root.leaf,
-			   net->ipv6.ip6_null_entry);
+			   net->ipv6.fib6_null_entry);
 	net->ipv6.fib6_main_tbl->tb6_root.fn_flags =
 		RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
 	inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers);
@@ -2090,7 +2090,7 @@ static int __net_init fib6_net_init(struct net *net)
 		goto out_fib6_main_tbl;
 	net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL;
 	rcu_assign_pointer(net->ipv6.fib6_local_tbl->tb6_root.leaf,
-			   net->ipv6.ip6_null_entry);
+			   net->ipv6.fib6_null_entry);
 	net->ipv6.fib6_local_tbl->tb6_root.fn_flags =
 		RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
 	inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fc3ddcbe8899..86ee78633697 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -276,6 +276,15 @@ static const u32 ip6_template_metrics[RTAX_MAX] = {
 	[RTAX_HOPLIMIT - 1] = 0,
 };
 
+static const struct rt6_info fib6_null_entry_template = {
+	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
+	.rt6i_protocol  = RTPROT_KERNEL,
+	.rt6i_metric	= ~(u32)0,
+	.rt6i_ref	= ATOMIC_INIT(1),
+	.fib6_type	= RTN_UNREACHABLE,
+	.fib6_metrics	= (struct dst_metrics *)&dst_default_metrics,
+};
+
 static const struct rt6_info ip6_null_entry_template = {
 	.dst = {
 		.__refcnt	= ATOMIC_INIT(1),
@@ -522,10 +531,10 @@ static inline struct rt6_info *rt6_device_match(struct net *net,
 			return local;
 
 		if (flags & RT6_LOOKUP_F_IFACE)
-			return net->ipv6.ip6_null_entry;
+			return net->ipv6.fib6_null_entry;
 	}
 
-	return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.ip6_null_entry : rt;
+	return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.fib6_null_entry : rt;
 }
 
 #ifdef CONFIG_IPV6_ROUTER_PREF
@@ -758,8 +767,8 @@ static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
 	bool do_rr = false;
 	int key_plen;
 
-	if (!leaf || leaf == net->ipv6.ip6_null_entry)
-		return net->ipv6.ip6_null_entry;
+	if (!leaf || leaf == net->ipv6.fib6_null_entry)
+		return net->ipv6.fib6_null_entry;
 
 	rt0 = rcu_dereference(fn->rr_ptr);
 	if (!rt0)
@@ -776,7 +785,7 @@ static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
 		key_plen = rt0->rt6i_src.plen;
 #endif
 	if (fn->fn_bit != key_plen)
-		return net->ipv6.ip6_null_entry;
+		return net->ipv6.fib6_null_entry;
 
 	match = find_rr_leaf(fn, leaf, rt0, rt0->rt6i_metric, oif, strict,
 			     &do_rr);
@@ -797,7 +806,7 @@ static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
 		}
 	}
 
-	return match ? match : net->ipv6.ip6_null_entry;
+	return match ? match : net->ipv6.fib6_null_entry;
 }
 
 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
@@ -1060,7 +1069,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 restart:
 	rt = rcu_dereference(fn->leaf);
 	if (!rt) {
-		rt = net->ipv6.ip6_null_entry;
+		rt = net->ipv6.fib6_null_entry;
 	} else {
 		rt = rt6_device_match(net, rt, &fl6->saddr,
 				      fl6->flowi6_oif, flags);
@@ -1068,7 +1077,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 			rt = rt6_multipath_select(net, rt, fl6, fl6->flowi6_oif,
 						  skb, flags);
 	}
-	if (rt == net->ipv6.ip6_null_entry) {
+	if (rt == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto restart;
@@ -1793,7 +1802,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 	rt = rt6_select(net, fn, oif, strict);
 	if (rt->rt6i_nsiblings)
 		rt = rt6_multipath_select(net, rt, fl6, oif, skb, strict);
-	if (rt == net->ipv6.ip6_null_entry) {
+	if (rt == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto redo_rt6_select;
@@ -1810,7 +1819,8 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 	if (rt_cache)
 		rt = rt_cache;
 
-	if (rt == net->ipv6.ip6_null_entry) {
+	if (rt == net->ipv6.fib6_null_entry) {
+		rt = net->ipv6.ip6_null_entry;
 		rcu_read_unlock();
 		dst_hold(&rt->dst);
 		trace_fib6_table_lookup(net, rt, table, fl6);
@@ -2368,13 +2378,13 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 	}
 
 	if (!rt)
-		rt = net->ipv6.ip6_null_entry;
+		rt = net->ipv6.fib6_null_entry;
 	else if (rt->rt6i_flags & RTF_REJECT) {
 		rt = net->ipv6.ip6_null_entry;
 		goto out;
 	}
 
-	if (rt == net->ipv6.ip6_null_entry) {
+	if (rt == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto restart;
@@ -3001,7 +3011,7 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 	struct fib6_table *table;
 	int err;
 
-	if (rt == net->ipv6.ip6_null_entry) {
+	if (rt == net->ipv6.fib6_null_entry) {
 		err = -ENOENT;
 		goto out;
 	}
@@ -3031,7 +3041,7 @@ static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
 	struct fib6_table *table;
 	int err = -ENOENT;
 
-	if (rt == net->ipv6.ip6_null_entry)
+	if (rt == net->ipv6.fib6_null_entry)
 		goto out_put;
 	table = rt->rt6i_table;
 	spin_lock_bh(&table->tb6_lock);
@@ -3583,7 +3593,7 @@ static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
 	struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
 
 	if (((void *)rt->fib6_nh.nh_dev == dev || !dev) &&
-	    rt != net->ipv6.ip6_null_entry &&
+	    rt != net->ipv6.fib6_null_entry &&
 	    ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
 		spin_lock_bh(&rt6_exception_lock);
 		/* remove prefsrc entry */
@@ -3738,7 +3748,7 @@ static int fib6_ifup(struct rt6_info *rt, void *p_arg)
 	const struct arg_netdev_event *arg = p_arg;
 	struct net *net = dev_net(arg->dev);
 
-	if (rt != net->ipv6.ip6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
+	if (rt != net->ipv6.fib6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
 		rt->fib6_nh.nh_flags &= ~arg->nh_flags;
 		fib6_update_sernum_upto_root(net, rt);
 		rt6_multipath_rebalance(rt);
@@ -3822,7 +3832,7 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
 	const struct net_device *dev = arg->dev;
 	struct net *net = dev_net(dev);
 
-	if (rt == net->ipv6.ip6_null_entry)
+	if (rt == net->ipv6.fib6_null_entry)
 		return 0;
 
 	switch (arg->event) {
@@ -4579,7 +4589,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg)
 	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
 	struct net *net = arg->net;
 
-	if (rt == net->ipv6.ip6_null_entry)
+	if (rt == net->ipv6.fib6_null_entry)
 		return 0;
 
 	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
@@ -4768,6 +4778,8 @@ static int ip6_route_dev_notify(struct notifier_block *this,
 		return NOTIFY_OK;
 
 	if (event == NETDEV_REGISTER) {
+		net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev;
+		net->ipv6.fib6_null_entry->rt6i_idev = in6_dev_get(dev);
 		net->ipv6.ip6_null_entry->dst.dev = dev;
 		net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -4781,6 +4793,7 @@ static int ip6_route_dev_notify(struct notifier_block *this,
 		/* NETDEV_UNREGISTER could be fired for multiple times by
 		 * netdev_wait_allrefs(). Make sure we only call this once.
 		 */
+		in6_dev_put_clear(&net->ipv6.fib6_null_entry->rt6i_idev);
 		in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 		in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
@@ -4964,11 +4977,17 @@ static int __net_init ip6_route_net_init(struct net *net)
 	if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
 		goto out_ip6_dst_ops;
 
+	net->ipv6.fib6_null_entry = kmemdup(&fib6_null_entry_template,
+					    sizeof(*net->ipv6.fib6_null_entry),
+					    GFP_KERNEL);
+	if (!net->ipv6.fib6_null_entry)
+		goto out_ip6_dst_entries;
+
 	net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
 					   sizeof(*net->ipv6.ip6_null_entry),
 					   GFP_KERNEL);
 	if (!net->ipv6.ip6_null_entry)
-		goto out_ip6_dst_entries;
+		goto out_fib6_null_entry;
 	net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
 	dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
 			 ip6_template_metrics, true);
@@ -5015,6 +5034,8 @@ static int __net_init ip6_route_net_init(struct net *net)
 out_ip6_null_entry:
 	kfree(net->ipv6.ip6_null_entry);
 #endif
+out_fib6_null_entry:
+	kfree(net->ipv6.fib6_null_entry);
 out_ip6_dst_entries:
 	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
 out_ip6_dst_ops:
@@ -5023,6 +5044,7 @@ static int __net_init ip6_route_net_init(struct net *net)
 
 static void __net_exit ip6_route_net_exit(struct net *net)
 {
+	kfree(net->ipv6.fib6_null_entry);
 	kfree(net->ipv6.ip6_null_entry);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 	kfree(net->ipv6.ip6_prohibit_entry);
@@ -5096,6 +5118,8 @@ void __init ip6_route_init_special_entries(void)
 	/* Registering of the loopback is done before this portion of code,
 	 * the loopback reference in rt6_info will not be taken, do it
 	 * manually for init_net */
+	init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev;
+	init_net.ipv6.fib6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
 	init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
 	init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
   #ifdef CONFIG_IPV6_MULTIPLE_TABLES
-- 
2.11.0

[PATCH RFC v2 net-next 13/21] net/ipv6: Add rt6_info create function for ip6_pol_route_lookup

[David Ahern]

ip6_pol_route_lookup is the lookup function for ip6_route_lookup and
rt6_lookup. At the moment it returns either a reference to a FIB entry
or a cached exception. To move FIB entries to a separate struct, this
lookup function needs to convert FIB entries to an rt6_info that is
returned to the caller.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/ipv6/route.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 86ee78633697..39fd9f88912f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1055,6 +1055,20 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
 	return false;
 }
 
+/* called with rcu_lock held */
+static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
+{
+	struct net_device *dev;
+	struct rt6_info *nrt;
+
+	dev = ip6_rt_get_dev_rcu(rt);
+	nrt = __ip6_dst_alloc(dev_net(dev), dev, 0);
+	if (nrt)
+		ip6_rt_copy_init(nrt, rt);
+
+	return nrt;
+}
+
 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 					     struct fib6_table *table,
 					     struct flowi6 *fl6,
@@ -1084,18 +1098,26 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 	}
 	/* Search through exception table */
 	rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
-	if (rt_cache)
+	if (rt_cache) {
 		rt = rt_cache;
+		if (ip6_hold_safe(net, &rt, true))
+			dst_use_noref(&rt->dst, jiffies);
+	} else if (dst_hold_safe(&rt->dst)) {
+		struct rt6_info *nrt;
 
-	if (ip6_hold_safe(net, &rt, true))
-		dst_use_noref(&rt->dst, jiffies);
+		nrt = ip6_create_rt_rcu(rt);
+		dst_release(&rt->dst);
+		rt = nrt;
+	} else {
+		rt = net->ipv6.ip6_null_entry;
+		dst_hold(&rt->dst);
+	}
 
 	rcu_read_unlock();
 
 	trace_fib6_table_lookup(net, rt, table, fl6);
 
 	return rt;
-
 }
 
 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
-- 
2.11.0

[PATCH RFC v2 net-next 14/21] net/ipv6: Move dst flags to booleans in fib entries

[David Ahern]

Continuing to wean FIB paths off of dst_entry, use a bool to hold
requests for certain dst settings. Add a helper to convert the
flags to DST flags when a FIB entry is converted to a dst_entry.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h |  5 ++++-
 net/ipv6/addrconf.c   |  4 ++--
 net/ipv6/route.c      | 29 ++++++++++++++++++++++++-----
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index c73b985734f5..159f651dee55 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -177,7 +177,10 @@ struct rt6_info {
 	u8				fib6_type;
 	u8				exception_bucket_flushed:1,
 					should_flush:1,
-					unused:6;
+					dst_nocount:1,
+					dst_nopolicy:1,
+					dst_host:1,
+					unused:3;
 
 	unsigned long			expires;
 	struct dst_metrics		*fib6_metrics;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 23834864adb5..5772c71ef610 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1058,7 +1058,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 
 	if (net->ipv6.devconf_all->disable_policy ||
 	    idev->cnf.disable_policy)
-		rt->dst.flags |= DST_NOPOLICY;
+		rt->dst_nopolicy = true;
 
 	neigh_parms_data_state_setall(idev->nd_parms);
 
@@ -5998,7 +5998,7 @@ void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
 			int cpu;
 
 			rcu_read_lock();
-			addrconf_set_nopolicy(ifa->rt, val);
+			ifa->rt->dst_nopolicy = val ? true : false;
 			if (rt->rt6i_pcpu) {
 				for_each_possible_cpu(cpu) {
 					struct rt6_info **rtp;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 39fd9f88912f..d2c146790d70 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -937,6 +937,20 @@ static int ip6_rt_type_to_error(u8 fib6_type)
 	return fib6_prop[fib6_type];
 }
 
+static unsigned short fib6_info_dst_flags(struct rt6_info *rt)
+{
+	unsigned short flags = 0;
+
+	if (rt->dst_nocount)
+		flags |= DST_NOCOUNT;
+	if (rt->dst_nopolicy)
+		flags |= DST_NOPOLICY;
+	if (rt->dst_host)
+		flags |= DST_HOST;
+
+	return flags;
+}
+
 static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
 {
 	rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
@@ -961,6 +975,8 @@ static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
 
 static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 {
+	rt->dst.flags |= fib6_info_dst_flags(ort);
+
 	if (ort->rt6i_flags & RTF_REJECT) {
 		ip6_rt_init_dst_reject(rt, ort);
 		return;
@@ -970,7 +986,6 @@ static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 	rt->dst.output = ip6_output;
 
 	if (ort->fib6_type == RTN_LOCAL) {
-		rt->dst.flags |= DST_HOST;
 		rt->dst.input = ip6_input;
 	} else if (ipv6_addr_type(&ort->rt6i_dst.addr) & IPV6_ADDR_MULTICAST) {
 		rt->dst.input = ip6_mc_input;
@@ -1058,11 +1073,12 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
 /* called with rcu_lock held */
 static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
 {
+	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
 	struct rt6_info *nrt;
 
 	dev = ip6_rt_get_dev_rcu(rt);
-	nrt = __ip6_dst_alloc(dev_net(dev), dev, 0);
+	nrt = __ip6_dst_alloc(dev_net(dev), dev, flags);
 	if (nrt)
 		ip6_rt_copy_init(nrt, rt);
 
@@ -1227,12 +1243,13 @@ static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 
 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
 {
+	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
 	struct rt6_info *pcpu_rt;
 
 	rcu_read_lock();
 	dev = ip6_rt_get_dev_rcu(rt);
-	pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, rt->dst.flags);
+	pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, flags);
 	rcu_read_unlock();
 	if (!pcpu_rt)
 		return NULL;
@@ -2922,7 +2939,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
 	rt->rt6i_dst.plen = cfg->fc_dst_len;
 	if (rt->rt6i_dst.plen == 128)
-		rt->dst.flags |= DST_HOST;
+		rt->dst_host = true;
 
 #ifdef CONFIG_IPV6_SUBTREES
 	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
@@ -3576,10 +3593,12 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 	if (!rt)
 		return ERR_PTR(-ENOMEM);
 
+	rt->dst_nocount = true;
+
 	in6_dev_hold(idev);
 	rt->rt6i_idev = idev;
 
-	rt->dst.flags |= DST_HOST;
+	rt->dst_host = true;
 	rt->rt6i_protocol = RTPROT_KERNEL;
 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
 	if (anycast) {
-- 
2.11.0

[PATCH RFC v2 net-next 15/21] net/ipv6: Create a neigh_lookup for FIB entries

[David Ahern]

The router discovery code has a FIB entry and wants to validate the
gateway has a neighbor entry. Refactor the existing dst_neigh_lookup
for IPv6 and create a new function that takes the gateway and device
and returns a neighbor entry. Use the new function in
ndisc_router_discovery to validate the gateway.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_route.h |  3 +++
 net/ipv6/ndisc.c        |  8 ++++++--
 net/ipv6/route.c        | 33 ++++++++++++++++++++-------------
 3 files changed, 29 insertions(+), 15 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 8b07c3fcd32d..8e50e9f10158 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -273,4 +273,7 @@ static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
 	       !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate);
 }
 
+struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
+				   struct net_device *dev, struct sk_buff *skb,
+				   const void *daddr);
 #endif
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 848f518d48d4..9ae194cb400a 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1276,7 +1276,9 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
 
 	if (rt) {
-		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
+		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
+					 rt->fib6_nh.nh_dev, NULL,
+					  &ipv6_hdr(skb)->saddr);
 		if (!neigh) {
 			ND_PRINTK(0, err,
 				  "RA: %s got default router without neighbour\n",
@@ -1304,7 +1306,9 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 			return;
 		}
 
-		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
+		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
+					 rt->fib6_nh.nh_dev, NULL,
+					  &ipv6_hdr(skb)->saddr);
 		if (!neigh) {
 			ND_PRINTK(0, err,
 				  "RA: %s got default router without neighbour\n",
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d2c146790d70..0eadef74c815 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -182,12 +182,10 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
 	}
 }
 
-static inline const void *choose_neigh_daddr(struct rt6_info *rt,
+static inline const void *choose_neigh_daddr(const struct in6_addr *p,
 					     struct sk_buff *skb,
 					     const void *daddr)
 {
-	struct in6_addr *p = &rt->rt6i_gateway;
-
 	if (!ipv6_addr_any(p))
 		return (const void *) p;
 	else if (skb)
@@ -195,18 +193,27 @@ static inline const void *choose_neigh_daddr(struct rt6_info *rt,
 	return daddr;
 }
 
-static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
-					  struct sk_buff *skb,
-					  const void *daddr)
+struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
+				   struct net_device *dev,
+				   struct sk_buff *skb,
+				   const void *daddr)
 {
-	struct rt6_info *rt = (struct rt6_info *) dst;
 	struct neighbour *n;
 
-	daddr = choose_neigh_daddr(rt, skb, daddr);
-	n = __ipv6_neigh_lookup(dst->dev, daddr);
+	daddr = choose_neigh_daddr(gw, skb, daddr);
+	n = __ipv6_neigh_lookup(dev, daddr);
 	if (n)
 		return n;
-	return neigh_create(&nd_tbl, daddr, dst->dev);
+	return neigh_create(&nd_tbl, daddr, dev);
+}
+
+static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
+					      struct sk_buff *skb,
+					      const void *daddr)
+{
+	const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
+
+	return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr);
 }
 
 static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
@@ -214,7 +221,7 @@ static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
 	struct net_device *dev = dst->dev;
 	struct rt6_info *rt = (struct rt6_info *)dst;
 
-	daddr = choose_neigh_daddr(rt, NULL, daddr);
+	daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);
 	if (!daddr)
 		return;
 	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
@@ -239,7 +246,7 @@ static struct dst_ops ip6_dst_ops_template = {
 	.update_pmtu		=	ip6_rt_update_pmtu,
 	.redirect		=	rt6_do_redirect,
 	.local_out		=	__ip6_local_out,
-	.neigh_lookup		=	ip6_neigh_lookup,
+	.neigh_lookup		=	ip6_dst_neigh_lookup,
 	.confirm_neigh		=	ip6_confirm_neigh,
 };
 
@@ -269,7 +276,7 @@ static struct dst_ops ip6_dst_blackhole_ops = {
 	.update_pmtu		=	ip6_rt_blackhole_update_pmtu,
 	.redirect		=	ip6_rt_blackhole_redirect,
 	.cow_metrics		=	dst_cow_metrics_generic,
-	.neigh_lookup		=	ip6_neigh_lookup,
+	.neigh_lookup		=	ip6_dst_neigh_lookup,
 };
 
 static const u32 ip6_template_metrics[RTAX_MAX] = {
-- 
2.11.0

[PATCH RFC v2 net-next 16/21] net/ipv6: Add gfp_flags to route add functions

[David Ahern]

Most FIB entries can be added using memory allocated with GFP_KERNEL.
Add gfp_flags to ip6_route_add and addrconf_dst_alloc. Code paths that
can be reached from the packet path (e.g., ndisc and autoconfig) or
atomic notifiers use GFP_ATOMIC; paths from user context (adding
addresses and routes) use GFP_KERNEL.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_route.h |  6 ++++--
 net/ipv6/addrconf.c     | 39 +++++++++++++++++++++++----------------
 net/ipv6/anycast.c      |  2 +-
 net/ipv6/route.c        | 18 ++++++++++--------
 4 files changed, 38 insertions(+), 27 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 8e50e9f10158..76d2c31e18b7 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -100,7 +100,8 @@ void ip6_route_cleanup(void);
 
 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 
-int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack);
+int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
+		  struct netlink_ext_ack *extack);
 int ip6_ins_rt(struct net *net, struct rt6_info *rt);
 int ip6_del_rt(struct net *net, struct rt6_info *rt);
 
@@ -138,7 +139,8 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 void fib6_force_start_gc(struct net *net);
 
 struct rt6_info *addrconf_dst_alloc(struct net *net, struct inet6_dev *idev,
-				    const struct in6_addr *addr, bool anycast);
+				    const struct in6_addr *addr, bool anycast,
+				    gfp_t gfp_flags);
 
 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 			       int flags);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5772c71ef610..de485b0a90d5 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1049,7 +1049,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 		goto out;
 	}
 
-	rt = addrconf_dst_alloc(net, idev, addr, false);
+	rt = addrconf_dst_alloc(net, idev, addr, false, gfp_flags);
 	if (IS_ERR(rt)) {
 		err = PTR_ERR(rt);
 		rt = NULL;
@@ -2332,7 +2332,7 @@ static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpad
 
 static void
 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
-		      unsigned long expires, u32 flags)
+		      unsigned long expires, u32 flags, gfp_t gfp_flags)
 {
 	struct fib6_config cfg = {
 		.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
@@ -2357,7 +2357,7 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
 		cfg.fc_flags |= RTF_NONEXTHOP;
 #endif
 
-	ip6_route_add(&cfg, NULL);
+	ip6_route_add(&cfg, gfp_flags, NULL);
 }
 
 
@@ -2413,7 +2413,7 @@ static void addrconf_add_mroute(struct net_device *dev)
 
 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
 
-	ip6_route_add(&cfg, NULL);
+	ip6_route_add(&cfg, GFP_ATOMIC, NULL);
 }
 
 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
@@ -2698,7 +2698,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 				expires = jiffies_to_clock_t(rt_expires);
 			}
 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
-					      dev, expires, flags);
+					      dev, expires, flags, GFP_ATOMIC);
 		}
 		ip6_rt_put(rt);
 	}
@@ -2913,7 +2913,7 @@ static int inet6_addr_add(struct net *net, int ifindex,
 	if (!IS_ERR(ifp)) {
 		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
 			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
-					      expires, flags);
+					      expires, flags, GFP_KERNEL);
 		}
 
 		/*
@@ -3061,7 +3061,8 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 
 	if (addr.s6_addr32[3]) {
 		add_addr(idev, &addr, plen, scope);
-		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
+		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags,
+				      GFP_ATOMIC);
 		return;
 	}
 
@@ -3086,7 +3087,7 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 
 				add_addr(idev, &addr, plen, flag);
 				addrconf_prefix_route(&addr, plen, idev->dev, 0,
-						      pflags);
+						      pflags, GFP_ATOMIC);
 			}
 		}
 	}
@@ -3126,7 +3127,8 @@ void addrconf_add_linklocal(struct inet6_dev *idev,
 	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
 			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
 	if (!IS_ERR(ifp)) {
-		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
+		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev,
+				      0, 0, GFP_ATOMIC);
 		addrconf_dad_start(ifp);
 		in6_ifa_put(ifp);
 	}
@@ -3241,7 +3243,8 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
 			addrconf_add_linklocal(idev, &addr,
 					       IFA_F_STABLE_PRIVACY);
 		else if (prefix_route)
-			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+			addrconf_prefix_route(&addr, 64, idev->dev,
+					      0, 0, GFP_KERNEL);
 		break;
 	case IN6_ADDR_GEN_MODE_EUI64:
 		/* addrconf_add_linklocal also adds a prefix_route and we
@@ -3251,7 +3254,8 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
 		if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
 			addrconf_add_linklocal(idev, &addr, 0);
 		else if (prefix_route)
-			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+			addrconf_prefix_route(&addr, 64, idev->dev,
+					      0, 0, GFP_ATOMIC);
 		break;
 	case IN6_ADDR_GEN_MODE_NONE:
 	default:
@@ -3354,7 +3358,8 @@ static int fixup_permanent_addr(struct net *net,
 	if (!ifp->rt || !ifp->rt->rt6i_node) {
 		struct rt6_info *rt, *prev;
 
-		rt = addrconf_dst_alloc(net, idev, &ifp->addr, false);
+		rt = addrconf_dst_alloc(net, idev, &ifp->addr, false,
+					GFP_ATOMIC);
 		if (IS_ERR(rt))
 			return PTR_ERR(rt);
 
@@ -3369,7 +3374,7 @@ static int fixup_permanent_addr(struct net *net,
 
 	if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
-				      idev->dev, 0, 0);
+				      idev->dev, 0, 0, GFP_ATOMIC);
 	}
 
 	if (ifp->state == INET6_IFADDR_STATE_PREDAD)
@@ -4581,8 +4586,9 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
 		ipv6_ifa_notify(0, ifp);
 
 	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
-		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
-				      expires, flags);
+		addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
+				      ifp->idev->dev, expires, flags,
+				      GFP_KERNEL);
 	} else if (had_prefixroute) {
 		enum cleanup_prefix_rt_t action;
 		unsigned long rt_expires;
@@ -5631,7 +5637,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 			addrconf_join_anycast(ifp);
 		if (!ipv6_addr_any(&ifp->peer_addr))
 			addrconf_prefix_route(&ifp->peer_addr, 128,
-					      ifp->idev->dev, 0, 0);
+					      ifp->idev->dev, 0, 0,
+					      GFP_KERNEL);
 		break;
 	case RTM_DELADDR:
 		if (ifp->idev->cnf.forwarding)
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 7ecdbabb16dd..1d9ccc815e0b 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -267,7 +267,7 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 	}
 
 	net = dev_net(idev->dev);
-	rt = addrconf_dst_alloc(net, idev, addr, true);
+	rt = addrconf_dst_alloc(net, idev, addr, true, GFP_ATOMIC);
 	if (IS_ERR(rt)) {
 		err = PTR_ERR(rt);
 		goto out;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0eadef74c815..d14dbf5ff1db 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2823,6 +2823,7 @@ static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
 }
 
 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
+					      gfp_t gfp_flags,
 					      struct netlink_ext_ack *extack)
 {
 	struct net *net = cfg->fc_nlinfo.nl_net;
@@ -3037,12 +3038,13 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	return ERR_PTR(err);
 }
 
-int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack)
+int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
+		  struct netlink_ext_ack *extack)
 {
 	struct rt6_info *rt;
 	int err;
 
-	rt = ip6_route_info_create(cfg, extack);
+	rt = ip6_route_info_create(cfg, gfp_flags, extack);
 	if (IS_ERR(rt))
 		return PTR_ERR(rt);
 
@@ -3369,7 +3371,7 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
 	if (!prefixlen)
 		cfg.fc_flags |= RTF_DEFAULT;
 
-	ip6_route_add(&cfg, NULL);
+	ip6_route_add(&cfg, GFP_ATOMIC, NULL);
 
 	return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
 }
@@ -3420,7 +3422,7 @@ struct rt6_info *rt6_add_dflt_router(struct net *net,
 
 	cfg.fc_gateway = *gwaddr;
 
-	if (!ip6_route_add(&cfg, NULL)) {
+	if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
 		struct fib6_table *table;
 
 		table = fib6_get_table(dev_net(dev), cfg.fc_table);
@@ -3518,7 +3520,7 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 		rtnl_lock();
 		switch (cmd) {
 		case SIOCADDRT:
-			err = ip6_route_add(&cfg, NULL);
+			err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
 			break;
 		case SIOCDELRT:
 			err = ip6_route_del(&cfg, NULL);
@@ -3590,7 +3592,7 @@ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff
 struct rt6_info *addrconf_dst_alloc(struct net *net,
 				    struct inet6_dev *idev,
 				    const struct in6_addr *addr,
-				    bool anycast)
+				    bool anycast, gfp_t gfp_flags)
 {
 	u32 tb_id;
 	struct net_device *dev = idev->dev;
@@ -4251,7 +4253,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 				r_cfg.fc_encap_type = nla_get_u16(nla);
 		}
 
-		rt = ip6_route_info_create(&r_cfg, extack);
+		rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
 		if (IS_ERR(rt)) {
 			err = PTR_ERR(rt);
 			rt = NULL;
@@ -4404,7 +4406,7 @@ static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (cfg.fc_mp)
 		return ip6_route_multipath_add(&cfg, extack);
 	else
-		return ip6_route_add(&cfg, extack);
+		return ip6_route_add(&cfg, GFP_KERNEL, extack);
 }
 
 static size_t rt6_nlmsg_size(struct rt6_info *rt)
-- 
2.11.0

[PATCH RFC v2 net-next 17/21] net/ipv6: Cleanup exception and cache route handling

[David Ahern]

IPv6 FIB will only contain FIB entries with exception routes added to
the FIB entry. Once this transformation is complete, FIB lookups will
return a fib6_info with the lookup functions still returning a dst
based rt6_info. The current code uses rt6_info for both paths and
overloads the rt6_info variable usually called 'rt'.

This patch introduces a new 'f6i' variable name for the result of the FIB
lookup and keeps 'rt' as the dst based return variable. 'f6i' becomes a
fib6_info in a later patch which is why it is introduced as f6i now;
avoids the additional churn in the later patch.

In addition, remove RTF_CACHE and dst checks from fib6 add and delete
since they can not happen now and will never happen after the data
type flip.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_route.h |   1 -
 net/ipv6/ip6_fib.c      |  16 +-----
 net/ipv6/route.c        | 137 ++++++++++++++++++++++++++----------------------
 3 files changed, 75 insertions(+), 79 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 76d2c31e18b7..d722fa843f31 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -106,7 +106,6 @@ int ip6_ins_rt(struct net *net, struct rt6_info *rt);
 int ip6_del_rt(struct net *net, struct rt6_info *rt);
 
 void rt6_flush_exceptions(struct rt6_info *rt);
-int rt6_remove_exception_rt(struct rt6_info *rt);
 void rt6_age_exceptions(struct rt6_info *rt, struct fib6_gc_args *gc_args,
 			unsigned long now);
 
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 90df1589a6c2..e27a01aa64f4 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1065,7 +1065,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 static void fib6_start_gc(struct net *net, struct rt6_info *rt)
 {
 	if (!timer_pending(&net->ipv6.ip6_fib_timer) &&
-	    (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE)))
+	    (rt->rt6i_flags & RTF_EXPIRES))
 		mod_timer(&net->ipv6.ip6_fib_timer,
 			  jiffies + net->ipv6.sysctl.ip6_rt_gc_interval);
 }
@@ -1116,8 +1116,6 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 
 	if (WARN_ON_ONCE(!atomic_read(&rt->dst.__refcnt)))
 		return -EINVAL;
-	if (WARN_ON_ONCE(rt->rt6i_flags & RTF_CACHE))
-		return -EINVAL;
 
 	if (info->nlh) {
 		if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
@@ -1641,8 +1639,6 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 
 	RT6_TRACE("fib6_del_route\n");
 
-	WARN_ON_ONCE(rt->rt6i_flags & RTF_CACHE);
-
 	/* Unlink it */
 	*rtp = rt->rt6_next;
 	rt->rt6i_node = NULL;
@@ -1711,21 +1707,11 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
 	struct rt6_info __rcu **rtp;
 	struct rt6_info __rcu **rtp_next;
 
-#if RT6_DEBUG >= 2
-	if (rt->dst.obsolete > 0) {
-		WARN_ON(fn);
-		return -ENOENT;
-	}
-#endif
 	if (!fn || rt == net->ipv6.fib6_null_entry)
 		return -ENOENT;
 
 	WARN_ON(!(fn->fn_flags & RTN_RTINFO));
 
-	/* remove cached dst from exception table */
-	if (rt->rt6i_flags & RTF_CACHE)
-		return rt6_remove_exception_rt(rt);
-
 	/*
 	 *	Walk the leaf entries looking for ourself
 	 */
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d14dbf5ff1db..8eda7d09729b 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1013,8 +1013,8 @@ static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 	BUG_ON(from->from);
 
 	rt->rt6i_flags &= ~RTF_EXPIRES;
-	dst_hold(&from->dst);
-	rt->from = from;
+	if (dst_hold_safe(&from->dst))
+		rt->from = from;
 	dst_init_metrics(&rt->dst, from->fib6_metrics->metrics, true);
 	if (from->fib6_metrics != &dst_default_metrics) {
 		rt->dst._metrics |= DST_METRICS_REFCOUNTED;
@@ -1098,42 +1098,36 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 					     const struct sk_buff *skb,
 					     int flags)
 {
-	struct rt6_info *rt, *rt_cache;
+	struct rt6_info *f6i;
 	struct fib6_node *fn;
+	struct rt6_info *rt;
 
 	rcu_read_lock();
 	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 restart:
-	rt = rcu_dereference(fn->leaf);
-	if (!rt) {
-		rt = net->ipv6.fib6_null_entry;
+	f6i = rcu_dereference(fn->leaf);
+	if (!f6i) {
+		f6i = net->ipv6.fib6_null_entry;
 	} else {
-		rt = rt6_device_match(net, rt, &fl6->saddr,
+		f6i = rt6_device_match(net, f6i, &fl6->saddr,
 				      fl6->flowi6_oif, flags);
-		if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
-			rt = rt6_multipath_select(net, rt, fl6, fl6->flowi6_oif,
-						  skb, flags);
+		if (f6i->rt6i_nsiblings && fl6->flowi6_oif == 0)
+			f6i = rt6_multipath_select(net, f6i, fl6,
+						   fl6->flowi6_oif, skb, flags);
 	}
-	if (rt == net->ipv6.fib6_null_entry) {
+	if (f6i == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto restart;
 	}
+
 	/* Search through exception table */
-	rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
-	if (rt_cache) {
-		rt = rt_cache;
+	rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+	if (rt) {
 		if (ip6_hold_safe(net, &rt, true))
 			dst_use_noref(&rt->dst, jiffies);
-	} else if (dst_hold_safe(&rt->dst)) {
-		struct rt6_info *nrt;
-
-		nrt = ip6_create_rt_rcu(rt);
-		dst_release(&rt->dst);
-		rt = nrt;
 	} else {
-		rt = net->ipv6.ip6_null_entry;
-		dst_hold(&rt->dst);
+		rt = ip6_create_rt_rcu(f6i);
 	}
 
 	rcu_read_unlock();
@@ -1216,9 +1210,6 @@ static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 	 *	Clone the route.
 	 */
 
-	if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
-		ort = ort->from;
-
 	rcu_read_lock();
 	dev = ip6_rt_get_dev_rcu(ort);
 	rt = __ip6_dst_alloc(dev_net(dev), dev, 0);
@@ -1444,11 +1435,6 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	struct rt6_exception *rt6_ex;
 	int err = 0;
 
-	/* ort can't be a cache or pcpu route */
-	if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
-		ort = ort->from;
-	WARN_ON_ONCE(ort->rt6i_flags & (RTF_CACHE | RTF_PCPU));
-
 	spin_lock_bh(&rt6_exception_lock);
 
 	if (ort->exception_bucket_flushed) {
@@ -1587,7 +1573,7 @@ static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
 }
 
 /* Remove the passed in cached rt from the hash table that contains it */
-int rt6_remove_exception_rt(struct rt6_info *rt)
+static int rt6_remove_exception_rt(struct rt6_info *rt)
 {
 	struct rt6_exception_bucket *bucket;
 	struct rt6_info *from = rt->from;
@@ -1828,7 +1814,8 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 			       const struct sk_buff *skb, int flags)
 {
 	struct fib6_node *fn, *saved_fn;
-	struct rt6_info *rt, *rt_cache;
+	struct rt6_info *f6i;
+	struct rt6_info *rt;
 	int strict = 0;
 
 	strict |= flags & RT6_LOOKUP_F_IFACE;
@@ -1845,10 +1832,10 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		oif = 0;
 
 redo_rt6_select:
-	rt = rt6_select(net, fn, oif, strict);
-	if (rt->rt6i_nsiblings)
-		rt = rt6_multipath_select(net, rt, fl6, oif, skb, strict);
-	if (rt == net->ipv6.fib6_null_entry) {
+	f6i = rt6_select(net, fn, oif, strict);
+	if (f6i->rt6i_nsiblings)
+		f6i = rt6_multipath_select(net, f6i, fl6, oif, skb, strict);
+	if (f6i == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto redo_rt6_select;
@@ -1860,18 +1847,17 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		}
 	}
 
-	/*Search through exception table */
-	rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
-	if (rt_cache)
-		rt = rt_cache;
-
-	if (rt == net->ipv6.fib6_null_entry) {
+	if (f6i == net->ipv6.fib6_null_entry) {
 		rt = net->ipv6.ip6_null_entry;
 		rcu_read_unlock();
 		dst_hold(&rt->dst);
 		trace_fib6_table_lookup(net, rt, table, fl6);
 		return rt;
-	} else if (rt->rt6i_flags & RTF_CACHE) {
+	}
+
+	/*Search through exception table */
+	rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+	if (rt) {
 		if (ip6_hold_safe(net, &rt, true))
 			dst_use_noref(&rt->dst, jiffies);
 
@@ -1879,7 +1865,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		trace_fib6_table_lookup(net, rt, table, fl6);
 		return rt;
 	} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
-			    !(rt->rt6i_flags & RTF_GATEWAY))) {
+			    !(f6i->rt6i_flags & RTF_GATEWAY))) {
 		/* Create a RTF_CACHE clone which will not be
 		 * owned by the fib6 tree.  It is for the special case where
 		 * the daddr in the skb during the neighbor look-up is different
@@ -1888,16 +1874,16 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 
 		struct rt6_info *uncached_rt;
 
-		if (ip6_hold_safe(net, &rt, true)) {
-			dst_use_noref(&rt->dst, jiffies);
+		if (ip6_hold_safe(net, &f6i, true)) {
+			dst_use_noref(&f6i->dst, jiffies);
 		} else {
 			rcu_read_unlock();
-			uncached_rt = rt;
+			uncached_rt = f6i;
 			goto uncached_rt_out;
 		}
 		rcu_read_unlock();
 
-		uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
+		uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
 		dst_release(&rt->dst);
 
 		if (uncached_rt) {
@@ -1920,18 +1906,18 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 
 		struct rt6_info *pcpu_rt;
 
-		dst_use_noref(&rt->dst, jiffies);
+		dst_use_noref(&f6i->dst, jiffies);
 		local_bh_disable();
-		pcpu_rt = rt6_get_pcpu_route(rt);
+		pcpu_rt = rt6_get_pcpu_route(f6i);
 
 		if (!pcpu_rt) {
 			/* atomic_inc_not_zero() is needed when using rcu */
-			if (atomic_inc_not_zero(&rt->rt6i_ref)) {
+			if (atomic_inc_not_zero(&f6i->rt6i_ref)) {
 				/* No dst_hold() on rt is needed because grabbing
 				 * rt->rt6i_ref makes sure rt can't be released.
 				 */
-				pcpu_rt = rt6_make_pcpu_route(net, rt);
-				rt6_release(rt);
+				pcpu_rt = rt6_make_pcpu_route(net, f6i);
+				rt6_release(f6i);
 			} else {
 				/* rt is already removed from tree */
 				pcpu_rt = net->ipv6.ip6_null_entry;
@@ -2376,7 +2362,8 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 					     int flags)
 {
 	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
-	struct rt6_info *rt, *rt_cache;
+	struct rt6_info *ret = NULL, *rt_cache;
+	struct rt6_info *rt;
 	struct fib6_node *fn;
 
 	/* Get the "current" route for this destination and
@@ -2415,7 +2402,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 			if (rt_cache &&
 			    ipv6_addr_equal(&rdfl->gateway,
 					    &rt_cache->rt6i_gateway)) {
-				rt = rt_cache;
+				ret = rt_cache;
 				break;
 			}
 			continue;
@@ -2426,7 +2413,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 	if (!rt)
 		rt = net->ipv6.fib6_null_entry;
 	else if (rt->rt6i_flags & RTF_REJECT) {
-		rt = net->ipv6.ip6_null_entry;
+		ret = net->ipv6.ip6_null_entry;
 		goto out;
 	}
 
@@ -2437,12 +2424,15 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 	}
 
 out:
-	ip6_hold_safe(net, &rt, true);
+	if (ret)
+		dst_hold(&ret->dst);
+	else
+		ret = ip6_create_rt_rcu(rt);
 
 	rcu_read_unlock();
 
-	trace_fib6_table_lookup(net, rt, table, fl6);
-	return rt;
+	trace_fib6_table_lookup(net, ret, table, fl6);
+	return ret;
 };
 
 static struct dst_entry *ip6_route_redirect(struct net *net,
@@ -3133,6 +3123,22 @@ static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
 	return err;
 }
 
+static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
+{
+	int rc = -ESRCH;
+
+	if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
+		goto out;
+
+	if (cfg->fc_flags & RTF_GATEWAY &&
+	    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
+		goto out;
+	if (dst_hold_safe(&rt->dst))
+		rc = rt6_remove_exception_rt(rt);
+out:
+	return rc;
+}
+
 static int ip6_route_del(struct fib6_config *cfg,
 			 struct netlink_ext_ack *extack)
 {
@@ -3157,11 +3163,16 @@ static int ip6_route_del(struct fib6_config *cfg,
 	if (fn) {
 		for_each_fib6_node_rt_rcu(fn) {
 			if (cfg->fc_flags & RTF_CACHE) {
+				int rc;
+
 				rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
 							      &cfg->fc_src);
-				if (!rt_cache)
-					continue;
-				rt = rt_cache;
+				if (rt_cache) {
+					rc = ip6_del_cached_rt(rt_cache, cfg);
+					if (rc != -ESRCH)
+						return rc;
+				}
+				continue;
 			}
 			if (cfg->fc_ifindex &&
 			    (!rt->fib6_nh.nh_dev ||
@@ -3278,7 +3289,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 				     NEIGH_UPDATE_F_ISROUTER)),
 		     NDISC_REDIRECT, &ndopts);
 
-	nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
+	nrt = ip6_rt_cache_alloc(rt->from, &msg->dest, NULL);
 	if (!nrt)
 		goto out;
 
-- 
2.11.0

[PATCH RFC v2 net-next 18/21] net/ipv6: introduce fib6_info struct and helpers

[David Ahern]

Add fib6_info struct and alloc, destroy, hold and release helpers.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 net/ipv6/ip6_fib.c    | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 159f651dee55..630392ae12d8 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -38,6 +38,7 @@
 #endif
 
 struct rt6_info;
+struct fib6_info;
 
 struct fib6_config {
 	u32		fc_table;
@@ -132,6 +133,46 @@ struct fib6_nh {
 	int			nh_weight;
 };
 
+struct fib6_info {
+	struct fib6_table		*rt6i_table;
+	struct fib6_info __rcu		*rt6_next;
+	struct fib6_node __rcu		*rt6i_node;
+
+	/* Multipath routes:
+	 * siblings is a list of fib6_info that have the the same metric/weight,
+	 * destination, but not the same gateway. nsiblings is just a cache
+	 * to speed up lookup.
+	 */
+	struct list_head		rt6i_siblings;
+	unsigned int			rt6i_nsiblings;
+
+	atomic_t			rt6i_ref;
+	struct inet6_dev		*rt6i_idev;
+	unsigned long			expires;
+	struct dst_metrics		*fib6_metrics;
+#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
+
+	struct rt6key			rt6i_dst;
+	u32				rt6i_flags;
+	struct rt6key			rt6i_src;
+	struct rt6key			rt6i_prefsrc;
+
+	struct rt6_info * __percpu	*rt6i_pcpu;
+	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
+
+	u32				rt6i_metric;
+	u8				rt6i_protocol;
+	u8				fib6_type;
+	u8				exception_bucket_flushed:1,
+					should_flush:1,
+					dst_nocount:1,
+					dst_nopolicy:1,
+					dst_host:1,
+					unused:3;
+
+	struct fib6_nh			fib6_nh;
+};
+
 struct rt6_info {
 	struct dst_entry		dst;
 	struct rt6_info __rcu		*rt6_next;
@@ -291,6 +332,20 @@ static inline void ip6_rt_put(struct rt6_info *rt)
 
 void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
 
+struct rt6_info *fib6_info_alloc(gfp_t gfp_flags);
+void fib6_info_destroy(struct rt6_info *f6i);
+
+static inline void fib6_info_hold(struct rt6_info *f6i)
+{
+	atomic_inc(&f6i->rt6i_ref);
+}
+
+static inline void fib6_info_release(struct rt6_info *f6i)
+{
+	if (f6i && atomic_dec_and_test(&f6i->rt6i_ref))
+		fib6_info_destroy(f6i);
+}
+
 static inline void rt6_hold(struct rt6_info *rt)
 {
 	atomic_inc(&rt->rt6i_ref);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index e27a01aa64f4..fe3ddbe36af4 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -145,6 +145,66 @@ static __be32 addr_bit_set(const void *token, int fn_bit)
 	       addr[fn_bit >> 5];
 }
 
+struct rt6_info *fib6_info_alloc(gfp_t gfp_flags)
+{
+	struct rt6_info *f6i;
+
+	f6i = kzalloc(sizeof(*f6i), gfp_flags);
+	if (!f6i)
+		return NULL;
+
+	f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
+	if (!f6i->rt6i_pcpu) {
+		kfree(f6i);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&f6i->rt6i_siblings);
+	f6i->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
+
+	atomic_inc(&f6i->rt6i_ref);
+
+	return f6i;
+}
+
+void fib6_info_destroy(struct rt6_info *f6i)
+{
+	struct rt6_exception_bucket *bucket;
+
+	WARN_ON(f6i->rt6i_node);
+
+	bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
+	if (bucket) {
+		f6i->rt6i_exception_bucket = NULL;
+		kfree(bucket);
+	}
+
+	if (f6i->rt6i_pcpu) {
+		int cpu;
+
+		for_each_possible_cpu(cpu) {
+			struct rt6_info **ppcpu_rt;
+			struct rt6_info *pcpu_rt;
+
+			ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
+			pcpu_rt = *ppcpu_rt;
+			if (pcpu_rt) {
+				dst_dev_put(&pcpu_rt->dst);
+				dst_release(&pcpu_rt->dst);
+				*ppcpu_rt = NULL;
+			}
+		}
+	}
+
+	if (f6i->rt6i_idev)
+		in6_dev_put(f6i->rt6i_idev);
+	if (f6i->fib6_nh.nh_dev)
+		dev_put(f6i->fib6_nh.nh_dev);
+
+	kfree(f6i);
+}
+EXPORT_SYMBOL_GPL(fib6_info_destroy);
+
 static struct fib6_node *node_alloc(struct net *net)
 {
 	struct fib6_node *fn;
-- 
2.11.0

[PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

[David Ahern]

Last step before flipping the data type for FIB entries:
- use fib6_info_alloc to create FIB entries in ip6_route_info_create
  and addrconf_dst_alloc
- use fib6_info_release in place of dst_release, ip6_rt_put and
  rt6_release
- remove the dst_hold before calling __ip6_ins_rt or ip6_del_rt
- when purging routes, drop per-cpu routes
- replace inc and dec of rt6i_ref with fib6_info_hold and fib6_info_release
- use rt->from since it points to the FIB entry
- drop references to exception bucket, fib6_metrics and per-cpu from
  dst entries (those are relevant for fib entries only)

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h   |   4 +-
 include/net/ip6_route.h |   3 +-
 net/ipv6/addrconf.c     |  18 +++--
 net/ipv6/anycast.c      |   7 +-
 net/ipv6/ip6_fib.c      |  50 ++++++++------
 net/ipv6/ip6_output.c   |   3 +-
 net/ipv6/ndisc.c        |   6 +-
 net/ipv6/route.c        | 171 +++++++++++++++++-------------------------------
 8 files changed, 110 insertions(+), 152 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 630392ae12d8..6c3d92bb3459 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -314,9 +314,7 @@ static inline u32 rt6_get_cookie(const struct rt6_info *rt)
 
 	if (rt->rt6i_flags & RTF_PCPU ||
 	    (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
-		rt = rt->from;
-
-	rt6_get_cookie_safe(rt, &cookie);
+		rt6_get_cookie_safe(rt->from, &cookie);
 
 	return cookie;
 }
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index d722fa843f31..a06931e529e1 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -114,8 +114,7 @@ static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
 				      unsigned int prefs,
 				      struct in6_addr *saddr)
 {
-	struct inet6_dev *idev =
-			rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
+	struct inet6_dev *idev = rt ? rt->rt6i_idev : NULL;
 	int err = 0;
 
 	if (rt && rt->rt6i_prefsrc.plen)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index de485b0a90d5..7dbd44958cd4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -927,7 +927,6 @@ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 		pr_warn("Freeing alive inet6 address %p\n", ifp);
 		return;
 	}
-	ip6_rt_put(ifp->rt);
 
 	kfree_rcu(ifp, rcu);
 }
@@ -1114,8 +1113,8 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 	inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 out:
 	if (unlikely(err < 0)) {
-		if (rt)
-			ip6_rt_put(rt);
+		fib6_info_release(rt);
+
 		if (ifa) {
 			if (ifa->idev)
 				in6_dev_put(ifa->idev);
@@ -1203,7 +1202,7 @@ cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_r
 		else {
 			if (!(rt->rt6i_flags & RTF_EXPIRES))
 				fib6_set_expires(rt, expires);
-			ip6_rt_put(rt);
+			fib6_info_release(rt);
 		}
 	}
 }
@@ -2387,8 +2386,7 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 			continue;
 		if ((rt->rt6i_flags & noflags) != 0)
 			continue;
-		if (!dst_hold_safe(&rt->dst))
-			rt = NULL;
+		fib6_info_hold(rt);
 		break;
 	}
 out:
@@ -2700,7 +2698,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
 					      dev, expires, flags, GFP_ATOMIC);
 		}
-		ip6_rt_put(rt);
+		fib6_info_release(rt);
 	}
 
 	/* Try to figure out our local address for this prefix */
@@ -3369,7 +3367,7 @@ static int fixup_permanent_addr(struct net *net,
 		ifp->rt = rt;
 		spin_unlock(&ifp->lock);
 
-		ip6_rt_put(prev);
+		fib6_info_release(prev);
 	}
 
 	if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
@@ -5653,8 +5651,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 				ip6_del_rt(net, rt);
 		}
 		if (ifp->rt) {
-			if (dst_hold_safe(&ifp->rt->dst))
-				ip6_del_rt(net, ifp->rt);
+			ip6_del_rt(net, ifp->rt);
+			ifp->rt = NULL;
 		}
 		rt_genid_bump_ipv6(net);
 		break;
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 1d9ccc815e0b..37b1a5805905 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -213,7 +213,7 @@ static void aca_put(struct ifacaddr6 *ac)
 {
 	if (refcount_dec_and_test(&ac->aca_refcnt)) {
 		in6_dev_put(ac->aca_idev);
-		dst_release(&ac->aca_rt->dst);
+		fib6_info_release(ac->aca_rt);
 		kfree(ac);
 	}
 }
@@ -231,6 +231,7 @@ static struct ifacaddr6 *aca_alloc(struct rt6_info *rt,
 	aca->aca_addr = *addr;
 	in6_dev_hold(idev);
 	aca->aca_idev = idev;
+	fib6_info_hold(rt);
 	aca->aca_rt = rt;
 	aca->aca_users = 1;
 	/* aca_tstamp should be updated upon changes */
@@ -274,7 +275,7 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 	}
 	aca = aca_alloc(rt, addr);
 	if (!aca) {
-		ip6_rt_put(rt);
+		fib6_info_release(rt);
 		err = -ENOMEM;
 		goto out;
 	}
@@ -330,7 +331,6 @@ int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 	write_unlock_bh(&idev->lock);
 	addrconf_leave_solict(idev, &aca->aca_addr);
 
-	dst_hold(&aca->aca_rt->dst);
 	ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
 
 	aca_put(aca);
@@ -358,7 +358,6 @@ void ipv6_ac_destroy_dev(struct inet6_dev *idev)
 
 		addrconf_leave_solict(idev, &aca->aca_addr);
 
-		dst_hold(&aca->aca_rt->dst);
 		ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
 
 		aca_put(aca);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index fe3ddbe36af4..0a3ad574318a 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -714,7 +714,7 @@ static struct fib6_node *fib6_add_1(struct net *net,
 			/* clean up an intermediate node */
 			if (!(fn->fn_flags & RTN_RTINFO)) {
 				RCU_INIT_POINTER(fn->leaf, NULL);
-				rt6_release(leaf);
+				fib6_info_release(leaf);
 			/* remove null_entry in the root node */
 			} else if (fn->fn_flags & RTN_TL_ROOT &&
 				   rcu_access_pointer(fn->leaf) ==
@@ -898,12 +898,32 @@ static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
 			if (!(fn->fn_flags & RTN_RTINFO) && leaf == rt) {
 				new_leaf = fib6_find_prefix(net, table, fn);
 				atomic_inc(&new_leaf->rt6i_ref);
+
 				rcu_assign_pointer(fn->leaf, new_leaf);
-				rt6_release(rt);
+				fib6_info_release(rt);
 			}
 			fn = rcu_dereference_protected(fn->parent,
 				    lockdep_is_held(&table->tb6_lock));
 		}
+
+		if (rt->rt6i_pcpu) {
+			int cpu;
+
+			/* release the reference to this fib entry from
+			 * all of its cached pcpu routes
+			 */
+			for_each_possible_cpu(cpu) {
+				struct rt6_info **ppcpu_rt;
+				struct rt6_info *pcpu_rt;
+
+				ppcpu_rt = per_cpu_ptr(rt->rt6i_pcpu, cpu);
+				pcpu_rt = *ppcpu_rt;
+				if (pcpu_rt) {
+					fib6_info_release(pcpu_rt->from);
+					pcpu_rt->from = NULL;
+				}
+			}
+		}
 	}
 }
 
@@ -1090,7 +1110,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 		fib6_purge_rt(iter, fn, info->nl_net);
 		if (rcu_access_pointer(fn->rr_ptr) == iter)
 			fn->rr_ptr = NULL;
-		rt6_release(iter);
+		fib6_info_release(iter);
 
 		if (nsiblings) {
 			/* Replacing an ECMP route, remove all siblings */
@@ -1106,7 +1126,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 					fib6_purge_rt(iter, fn, info->nl_net);
 					if (rcu_access_pointer(fn->rr_ptr) == iter)
 						fn->rr_ptr = NULL;
-					rt6_release(iter);
+					fib6_info_release(iter);
 					nsiblings--;
 					info->nl_net->ipv6.rt6_stats->fib_rt_entries--;
 				} else {
@@ -1174,9 +1194,6 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 	int replace_required = 0;
 	int sernum = fib6_new_sernum(info->nl_net);
 
-	if (WARN_ON_ONCE(!atomic_read(&rt->dst.__refcnt)))
-		return -EINVAL;
-
 	if (info->nlh) {
 		if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
 			allow_create = 0;
@@ -1291,7 +1308,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 			if (pn_leaf == rt) {
 				pn_leaf = NULL;
 				RCU_INIT_POINTER(pn->leaf, NULL);
-				atomic_dec(&rt->rt6i_ref);
+				fib6_info_release(rt);
 			}
 			if (!pn_leaf && !(pn->fn_flags & RTN_RTINFO)) {
 				pn_leaf = fib6_find_prefix(info->nl_net, table,
@@ -1303,7 +1320,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 					    info->nl_net->ipv6.fib6_null_entry;
 				}
 #endif
-				atomic_inc(&pn_leaf->rt6i_ref);
+				fib6_info_hold(pn_leaf);
 				rcu_assign_pointer(pn->leaf, pn_leaf);
 			}
 		}
@@ -1325,10 +1342,6 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 	     (fn->fn_flags & RTN_TL_ROOT &&
 	      !rcu_access_pointer(fn->leaf))))
 		fib6_repair_tree(info->nl_net, table, fn);
-	/* Always release dst as dst->__refcnt is guaranteed
-	 * to be taken before entering this function
-	 */
-	dst_release_immediate(&rt->dst);
 	return err;
 }
 
@@ -1628,7 +1641,7 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 				new_fn_leaf = net->ipv6.fib6_null_entry;
 			}
 #endif
-			atomic_inc(&new_fn_leaf->rt6i_ref);
+			fib6_info_hold(new_fn_leaf);
 			rcu_assign_pointer(fn->leaf, new_fn_leaf);
 			return pn;
 		}
@@ -1684,7 +1697,7 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 			return pn;
 
 		RCU_INIT_POINTER(pn->leaf, NULL);
-		rt6_release(pn_leaf);
+		fib6_info_release(pn_leaf);
 		fn = pn;
 	}
 }
@@ -1754,7 +1767,7 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 	call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt, NULL);
 	if (!info->skip_notify)
 		inet6_rt_notify(RTM_DELROUTE, rt, info, 0);
-	rt6_release(rt);
+	fib6_info_release(rt);
 }
 
 /* Need to own table->tb6_lock */
@@ -2253,9 +2266,8 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v)
 
 	dev = rt->fib6_nh.nh_dev;
 	seq_printf(seq, " %08x %08x %08x %08x %8s\n",
-		   rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
-		   rt->dst.__use, rt->rt6i_flags,
-		   dev ? dev->name : "");
+		   rt->rt6i_metric, atomic_read(&rt->rt6i_ref), 0,
+		   rt->rt6i_flags, dev ? dev->name : "");
 	iter->w.leaf = NULL;
 	return 0;
 }
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 2c7f09c3c39e..95c8b1ef2803 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -969,7 +969,8 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
 		if (!had_dst)
 			*dst = ip6_route_output(net, sk, fl6);
 		rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
-		err = ip6_route_get_saddr(net, rt, &fl6->daddr,
+		err = ip6_route_get_saddr(net, rt ? rt->from : NULL,
+					  &fl6->daddr,
 					  sk ? inet6_sk(sk)->srcprefs : 0,
 					  &fl6->saddr);
 		if (err)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 9ae194cb400a..c22670f56b47 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1283,7 +1283,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 			ND_PRINTK(0, err,
 				  "RA: %s got default router without neighbour\n",
 				  __func__);
-			ip6_rt_put(rt);
+			fib6_info_release(rt);
 			return;
 		}
 	}
@@ -1313,7 +1313,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 			ND_PRINTK(0, err,
 				  "RA: %s got default router without neighbour\n",
 				  __func__);
-			ip6_rt_put(rt);
+			fib6_info_release(rt);
 			return;
 		}
 		neigh->flags |= NTF_ROUTER;
@@ -1499,7 +1499,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 		ND_PRINTK(2, warn, "RA: invalid RA options\n");
 	}
 out:
-	ip6_rt_put(rt);
+	fib6_info_release(rt);
 	if (neigh)
 		neigh_release(neigh);
 }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8eda7d09729b..cd4210a58ab8 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -351,13 +351,11 @@ static void rt6_info_init(struct rt6_info *rt)
 	memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
 	INIT_LIST_HEAD(&rt->rt6i_siblings);
 	INIT_LIST_HEAD(&rt->rt6i_uncached);
-	rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
 }
 
 /* allocate dst with ip6_dst_ops */
-static struct rt6_info *__ip6_dst_alloc(struct net *net,
-					struct net_device *dev,
-					int flags)
+struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
+			       int flags)
 {
 	struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
 					1, DST_OBSOLETE_FORCE_CHK, flags);
@@ -369,35 +367,15 @@ static struct rt6_info *__ip6_dst_alloc(struct net *net,
 
 	return rt;
 }
-
-struct rt6_info *ip6_dst_alloc(struct net *net,
-			       struct net_device *dev,
-			       int flags)
-{
-	struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
-
-	if (rt) {
-		rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
-		if (!rt->rt6i_pcpu) {
-			dst_release_immediate(&rt->dst);
-			return NULL;
-		}
-	}
-
-	return rt;
-}
 EXPORT_SYMBOL(ip6_dst_alloc);
 
 static void ip6_dst_destroy(struct dst_entry *dst)
 {
 	struct rt6_info *rt = (struct rt6_info *)dst;
-	struct rt6_exception_bucket *bucket;
 	struct rt6_info *from = rt->from;
 	struct inet6_dev *idev;
-	struct dst_metrics *m;
 
 	dst_destroy_metrics_generic(dst);
-	free_percpu(rt->rt6i_pcpu);
 	rt6_uncached_list_del(rt);
 
 	idev = rt->rt6i_idev;
@@ -405,18 +383,9 @@ static void ip6_dst_destroy(struct dst_entry *dst)
 		rt->rt6i_idev = NULL;
 		in6_dev_put(idev);
 	}
-	bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
-	if (bucket) {
-		rt->rt6i_exception_bucket = NULL;
-		kfree(bucket);
-	}
-
-	m = rt->fib6_metrics;
-	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
-		kfree(m);
 
 	rt->from = NULL;
-	dst_release(&from->dst);
+	fib6_info_release(from);
 }
 
 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
@@ -891,7 +860,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 		else
 			fib6_set_expires(rt, jiffies + HZ * lifetime);
 
-		ip6_rt_put(rt);
+		fib6_info_release(rt);
 	}
 	return 0;
 }
@@ -1010,11 +979,9 @@ static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 
 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 {
-	BUG_ON(from->from);
-
 	rt->rt6i_flags &= ~RTF_EXPIRES;
-	if (dst_hold_safe(&from->dst))
-		rt->from = from;
+	fib6_info_hold(from);
+	rt->from = from;
 	dst_init_metrics(&rt->dst, from->fib6_metrics->metrics, true);
 	if (from->fib6_metrics != &dst_default_metrics) {
 		rt->dst._metrics |= DST_METRICS_REFCOUNTED;
@@ -1085,7 +1052,7 @@ static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
 	struct rt6_info *nrt;
 
 	dev = ip6_rt_get_dev_rcu(rt);
-	nrt = __ip6_dst_alloc(dev_net(dev), dev, flags);
+	nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
 	if (nrt)
 		ip6_rt_copy_init(nrt, rt);
 
@@ -1194,8 +1161,6 @@ int ip6_ins_rt(struct net *net, struct rt6_info *rt)
 {
 	struct nl_info info = {	.nl_net = net, };
 
-	/* Hold dst to account for the reference from the fib6 tree */
-	dst_hold(&rt->dst);
 	return __ip6_ins_rt(rt, &info, NULL);
 }
 
@@ -1212,7 +1177,7 @@ static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 
 	rcu_read_lock();
 	dev = ip6_rt_get_dev_rcu(ort);
-	rt = __ip6_dst_alloc(dev_net(dev), dev, 0);
+	rt = ip6_dst_alloc(dev_net(dev), dev, 0);
 	rcu_read_unlock();
 	if (!rt)
 		return NULL;
@@ -1247,7 +1212,7 @@ static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
 
 	rcu_read_lock();
 	dev = ip6_rt_get_dev_rcu(rt);
-	pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, flags);
+	pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
 	rcu_read_unlock();
 	if (!pcpu_rt)
 		return NULL;
@@ -1308,7 +1273,7 @@ static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
 	net = dev_net(rt6_ex->rt6i->dst.dev);
 	rt6_ex->rt6i->rt6i_node = NULL;
 	hlist_del_rcu(&rt6_ex->hlist);
-	rt6_release(rt6_ex->rt6i);
+	ip6_rt_put(rt6_ex->rt6i);
 	kfree_rcu(rt6_ex, rcu);
 	WARN_ON_ONCE(!bucket->depth);
 	bucket->depth--;
@@ -1874,17 +1839,11 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 
 		struct rt6_info *uncached_rt;
 
-		if (ip6_hold_safe(net, &f6i, true)) {
-			dst_use_noref(&f6i->dst, jiffies);
-		} else {
-			rcu_read_unlock();
-			uncached_rt = f6i;
-			goto uncached_rt_out;
-		}
+		fib6_info_hold(f6i);
 		rcu_read_unlock();
 
 		uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
-		dst_release(&rt->dst);
+		fib6_info_release(f6i);
 
 		if (uncached_rt) {
 			/* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
@@ -1897,7 +1856,6 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 			dst_hold(&uncached_rt->dst);
 		}
 
-uncached_rt_out:
 		trace_fib6_table_lookup(net, uncached_rt, table, fl6);
 		return uncached_rt;
 
@@ -1906,24 +1864,12 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 
 		struct rt6_info *pcpu_rt;
 
-		dst_use_noref(&f6i->dst, jiffies);
 		local_bh_disable();
 		pcpu_rt = rt6_get_pcpu_route(f6i);
 
-		if (!pcpu_rt) {
-			/* atomic_inc_not_zero() is needed when using rcu */
-			if (atomic_inc_not_zero(&f6i->rt6i_ref)) {
-				/* No dst_hold() on rt is needed because grabbing
-				 * rt->rt6i_ref makes sure rt can't be released.
-				 */
-				pcpu_rt = rt6_make_pcpu_route(net, f6i);
-				rt6_release(f6i);
-			} else {
-				/* rt is already removed from tree */
-				pcpu_rt = net->ipv6.ip6_null_entry;
-				dst_hold(&pcpu_rt->dst);
-			}
-		}
+		if (!pcpu_rt)
+			pcpu_rt = rt6_make_pcpu_route(net, f6i);
+
 		local_bh_enable();
 		rcu_read_unlock();
 		trace_fib6_table_lookup(net, pcpu_rt, table, fl6);
@@ -2160,11 +2106,26 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
  *	Destination cache support functions
  */
 
+static bool fib6_check(struct rt6_info *f6i, u32 cookie)
+{
+	u32 rt_cookie = 0;
+
+	if ((f6i && !rt6_get_cookie_safe(f6i, &rt_cookie)) ||
+	     rt_cookie != cookie)
+		return false;
+
+	if (fib6_check_expired(f6i))
+		return false;
+
+	return true;
+}
+
 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
 {
 	u32 rt_cookie = 0;
 
-	if (!rt6_get_cookie_safe(rt, &rt_cookie) || rt_cookie != cookie)
+	if ((rt->from && !rt6_get_cookie_safe(rt->from, &rt_cookie)) ||
+	    rt_cookie != cookie)
 		return NULL;
 
 	if (rt6_check_expired(rt))
@@ -2177,7 +2138,7 @@ static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
 {
 	if (!__rt6_check_expired(rt) &&
 	    rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
-	    rt6_check(rt->from, cookie))
+	    fib6_check(rt->from, cookie))
 		return &rt->dst;
 	else
 		return NULL;
@@ -2208,7 +2169,7 @@ static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
 	if (rt) {
 		if (rt->rt6i_flags & RTF_CACHE) {
 			if (rt6_check_expired(rt)) {
-				ip6_del_rt(dev_net(dst->dev), rt);
+				rt6_remove_exception_rt(rt);
 				dst = NULL;
 			}
 		} else {
@@ -2229,12 +2190,12 @@ static void ip6_link_failure(struct sk_buff *skb)
 	if (rt) {
 		if (rt->rt6i_flags & RTF_CACHE) {
 			if (dst_hold_safe(&rt->dst))
-				ip6_del_rt(dev_net(rt->dst.dev), rt);
-		} else {
+				rt6_remove_exception_rt(rt);
+		} else if (rt->from) {
 			struct fib6_node *fn;
 
 			rcu_read_lock();
-			fn = rcu_dereference(rt->rt6i_node);
+			fn = rcu_dereference(rt->from->rt6i_node);
 			if (fn && (rt->rt6i_flags & RTF_DEFAULT))
 				fn->fn_sernum = -1;
 			rcu_read_unlock();
@@ -2899,13 +2860,13 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	if (!table)
 		goto out;
 
-	rt = ip6_dst_alloc(net, NULL,
-			   (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
-
-	if (!rt) {
-		err = -ENOMEM;
+	err = -ENOMEM;
+	rt = fib6_info_alloc(gfp_flags);
+	if (!rt)
 		goto out;
-	}
+
+	if (cfg->fc_flags & RTF_ADDRCONF)
+		rt->dst_nocount = true;
 
 	err = ip6_convert_metrics(net, rt, cfg);
 	if (err < 0)
@@ -2979,7 +2940,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		if (err)
 			goto out;
 
-		rt->fib6_nh.nh_gw = rt->rt6i_gateway = cfg->fc_gateway;
+		rt->fib6_nh.nh_gw = cfg->fc_gateway;
 	}
 
 	err = -ENODEV;
@@ -3010,7 +2971,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 	    !netif_carrier_ok(dev))
 		rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
 	rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
-	rt->fib6_nh.nh_dev = rt->dst.dev = dev;
+	rt->fib6_nh.nh_dev = dev;
 	rt->rt6i_idev = idev;
 	rt->rt6i_table = table;
 
@@ -3022,9 +2983,8 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 		dev_put(dev);
 	if (idev)
 		in6_dev_put(idev);
-	if (rt)
-		dst_release_immediate(&rt->dst);
 
+	fib6_info_release(rt);
 	return ERR_PTR(err);
 }
 
@@ -3039,6 +2999,7 @@ int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
 		return PTR_ERR(rt);
 
 	err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
+	fib6_info_release(rt);
 
 	return err;
 }
@@ -3060,7 +3021,7 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 	spin_unlock_bh(&table->tb6_lock);
 
 out:
-	ip6_rt_put(rt);
+	fib6_info_release(rt);
 	return err;
 }
 
@@ -3114,7 +3075,7 @@ static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
 out_unlock:
 	spin_unlock_bh(&table->tb6_lock);
 out_put:
-	ip6_rt_put(rt);
+	fib6_info_release(rt);
 
 	if (skb) {
 		rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
@@ -3185,8 +3146,7 @@ static int ip6_route_del(struct fib6_config *cfg,
 				continue;
 			if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
 				continue;
-			if (!dst_hold_safe(&rt->dst))
-				break;
+			fib6_info_hold(rt);
 			rcu_read_unlock();
 
 			/* if gateway was specified only delete the one hop */
@@ -3454,12 +3414,9 @@ static void __rt6_purge_dflt_routers(struct net *net,
 	for_each_fib6_node_rt_rcu(&table->tb6_root) {
 		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
 		    (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
-			if (dst_hold_safe(&rt->dst)) {
-				rcu_read_unlock();
-				ip6_del_rt(net, rt);
-			} else {
-				rcu_read_unlock();
-			}
+			fib6_info_hold(rt);
+			rcu_read_unlock();
+			ip6_del_rt(net, rt);
 			goto restart;
 		}
 	}
@@ -3609,7 +3566,7 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 	struct net_device *dev = idev->dev;
 	struct rt6_info *rt;
 
-	rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
+	rt = fib6_info_alloc(gfp_flags);
 	if (!rt)
 		return ERR_PTR(-ENOMEM);
 
@@ -3630,8 +3587,8 @@ struct rt6_info *addrconf_dst_alloc(struct net *net,
 	}
 
 	rt->fib6_nh.nh_gw = *addr;
+	dev_hold(dev);
 	rt->fib6_nh.nh_dev = dev;
-	rt->rt6i_gateway  = *addr;
 	rt->rt6i_dst.addr = *addr;
 	rt->rt6i_dst.plen = 128;
 	tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
@@ -4276,7 +4233,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 		err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
 					    rt, &r_cfg);
 		if (err) {
-			dst_release_immediate(&rt->dst);
+			fib6_info_release(rt);
 			goto cleanup;
 		}
 
@@ -4293,6 +4250,8 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 	list_for_each_entry(nh, &rt6_nh_list, next) {
 		rt_last = nh->rt6_info;
 		err = __ip6_ins_rt(nh->rt6_info, info, extack);
+		fib6_info_release(nh->rt6_info);
+
 		/* save reference to first route for notification */
 		if (!rt_notif && !err)
 			rt_notif = nh->rt6_info;
@@ -4340,7 +4299,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 cleanup:
 	list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
 		if (nh->rt6_info)
-			dst_release_immediate(&nh->rt6_info->dst);
+			fib6_info_release(nh->rt6_info);
 		list_del(&nh->next);
 		kfree(nh);
 	}
@@ -4763,14 +4722,6 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 		goto errout;
 	}
 
-	if (fibmatch && rt->from) {
-		struct rt6_info *ort = rt->from;
-
-		dst_hold(&ort->dst);
-		ip6_rt_put(rt);
-		rt = ort;
-	}
-
 	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 	if (!skb) {
 		ip6_rt_put(rt);
@@ -4780,12 +4731,12 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 
 	skb_dst_set(skb, &rt->dst);
 	if (fibmatch)
-		err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, iif,
+		err = rt6_fill_node(net, skb, rt->from, NULL, NULL, NULL, iif,
 				    RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
 				    nlh->nlmsg_seq, 0);
 	else
-		err = rt6_fill_node(net, skb, rt, dst, &fl6.daddr, &fl6.saddr,
-				    iif, RTM_NEWROUTE,
+		err = rt6_fill_node(net, skb, rt->from, dst,
+				    &fl6.daddr, &fl6.saddr, iif, RTM_NEWROUTE,
 				    NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
 				    0);
 	if (err < 0) {
-- 
2.11.0

[PATCH RFC v2 net-next 20/21] net/ipv6: Flip FIB entries to fib6_info

[David Ahern]

Convert all code paths referencing a FIB entry from
rt6_info to fib6_info.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  |  64 ++---
 include/net/if_inet6.h                             |   4 +-
 include/net/ip6_fib.h                              |  42 ++--
 include/net/ip6_route.h                            |  28 +--
 include/net/netns/ipv6.h                           |   2 +-
 net/ipv6/addrconf.c                                |  20 +-
 net/ipv6/anycast.c                                 |   4 +-
 net/ipv6/ip6_fib.c                                 | 116 ++++-----
 net/ipv6/ndisc.c                                   |   2 +-
 net/ipv6/route.c                                   | 259 +++++++++++----------
 10 files changed, 271 insertions(+), 270 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 47ddcc2fd242..8fb51ebb41c0 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -442,7 +442,7 @@ struct mlxsw_sp_fib6_entry {
 
 struct mlxsw_sp_rt6 {
 	struct list_head list;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 };
 
 struct mlxsw_sp_lpm_tree {
@@ -3768,7 +3768,7 @@ mlxsw_sp_rt6_nexthop(struct mlxsw_sp_nexthop_group *nh_grp,
 
 	for (i = 0; i < nh_grp->count; i++) {
 		struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];
-		struct rt6_info *rt = mlxsw_sp_rt6->rt;
+		struct fib6_info *rt = mlxsw_sp_rt6->rt;
 
 		if (nh->rif && nh->rif->dev == rt->fib6_nh.nh_dev &&
 		    ipv6_addr_equal((const struct in6_addr *) &nh->gw_addr,
@@ -3854,7 +3854,7 @@ mlxsw_sp_fib6_entry_offload_unset(struct mlxsw_sp_fib_entry *fib_entry)
 	fib6_entry = container_of(fib_entry, struct mlxsw_sp_fib6_entry,
 				  common);
 	list_for_each_entry(mlxsw_sp_rt6, &fib6_entry->rt6_list, list) {
-		struct rt6_info *rt = mlxsw_sp_rt6->rt;
+		struct fib6_info *rt = mlxsw_sp_rt6->rt;
 
 		rt->fib6_nh.nh_flags &= ~RTNH_F_OFFLOAD;
 	}
@@ -4633,7 +4633,7 @@ static void mlxsw_sp_router_fib4_del(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
 }
 
-static bool mlxsw_sp_fib6_rt_should_ignore(const struct rt6_info *rt)
+static bool mlxsw_sp_fib6_rt_should_ignore(const struct fib6_info *rt)
 {
 	/* Packets with link-local destination IP arriving to the router
 	 * are trapped to the CPU, so no need to program specific routes
@@ -4655,7 +4655,7 @@ static bool mlxsw_sp_fib6_rt_should_ignore(const struct rt6_info *rt)
 	return false;
 }
 
-static struct mlxsw_sp_rt6 *mlxsw_sp_rt6_create(struct rt6_info *rt)
+static struct mlxsw_sp_rt6 *mlxsw_sp_rt6_create(struct fib6_info *rt)
 {
 	struct mlxsw_sp_rt6 *mlxsw_sp_rt6;
 
@@ -4668,18 +4668,18 @@ static struct mlxsw_sp_rt6 *mlxsw_sp_rt6_create(struct rt6_info *rt)
 	 * memory.
 	 */
 	mlxsw_sp_rt6->rt = rt;
-	rt6_hold(rt);
+	fib6_info_hold(rt);
 
 	return mlxsw_sp_rt6;
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
-static void mlxsw_sp_rt6_release(struct rt6_info *rt)
+static void mlxsw_sp_rt6_release(struct fib6_info *rt)
 {
-	rt6_release(rt);
+	fib6_info_release(rt);
 }
 #else
-static void mlxsw_sp_rt6_release(struct rt6_info *rt)
+static void mlxsw_sp_rt6_release(struct fib6_info *rt)
 {
 }
 #endif
@@ -4690,13 +4690,13 @@ static void mlxsw_sp_rt6_destroy(struct mlxsw_sp_rt6 *mlxsw_sp_rt6)
 	kfree(mlxsw_sp_rt6);
 }
 
-static bool mlxsw_sp_fib6_rt_can_mp(const struct rt6_info *rt)
+static bool mlxsw_sp_fib6_rt_can_mp(const struct fib6_info *rt)
 {
 	/* RTF_CACHE routes are ignored */
 	return (rt->rt6i_flags & (RTF_GATEWAY | RTF_ADDRCONF)) == RTF_GATEWAY;
 }
 
-static struct rt6_info *
+static struct fib6_info *
 mlxsw_sp_fib6_entry_rt(const struct mlxsw_sp_fib6_entry *fib6_entry)
 {
 	return list_first_entry(&fib6_entry->rt6_list, struct mlxsw_sp_rt6,
@@ -4705,7 +4705,7 @@ mlxsw_sp_fib6_entry_rt(const struct mlxsw_sp_fib6_entry *fib6_entry)
 
 static struct mlxsw_sp_fib6_entry *
 mlxsw_sp_fib6_node_mp_entry_find(const struct mlxsw_sp_fib_node *fib_node,
-				 const struct rt6_info *nrt, bool replace)
+				 const struct fib6_info *nrt, bool replace)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 
@@ -4713,7 +4713,7 @@ mlxsw_sp_fib6_node_mp_entry_find(const struct mlxsw_sp_fib_node *fib_node,
 		return NULL;
 
 	list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
-		struct rt6_info *rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
+		struct fib6_info *rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
 
 		/* RT6_TABLE_LOCAL and RT6_TABLE_MAIN share the same
 		 * virtual router.
@@ -4736,7 +4736,7 @@ mlxsw_sp_fib6_node_mp_entry_find(const struct mlxsw_sp_fib_node *fib_node,
 
 static struct mlxsw_sp_rt6 *
 mlxsw_sp_fib6_entry_rt_find(const struct mlxsw_sp_fib6_entry *fib6_entry,
-			    const struct rt6_info *rt)
+			    const struct fib6_info *rt)
 {
 	struct mlxsw_sp_rt6 *mlxsw_sp_rt6;
 
@@ -4749,7 +4749,7 @@ mlxsw_sp_fib6_entry_rt_find(const struct mlxsw_sp_fib6_entry *fib6_entry,
 }
 
 static bool mlxsw_sp_nexthop6_ipip_type(const struct mlxsw_sp *mlxsw_sp,
-					const struct rt6_info *rt,
+					const struct fib6_info *rt,
 					enum mlxsw_sp_ipip_type *ret)
 {
 	return rt->fib6_nh.nh_dev &&
@@ -4759,7 +4759,7 @@ static bool mlxsw_sp_nexthop6_ipip_type(const struct mlxsw_sp *mlxsw_sp,
 static int mlxsw_sp_nexthop6_type_init(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_nexthop_group *nh_grp,
 				       struct mlxsw_sp_nexthop *nh,
-				       const struct rt6_info *rt)
+				       const struct fib6_info *rt)
 {
 	const struct mlxsw_sp_ipip_ops *ipip_ops;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
@@ -4804,7 +4804,7 @@ static void mlxsw_sp_nexthop6_type_fini(struct mlxsw_sp *mlxsw_sp,
 static int mlxsw_sp_nexthop6_init(struct mlxsw_sp *mlxsw_sp,
 				  struct mlxsw_sp_nexthop_group *nh_grp,
 				  struct mlxsw_sp_nexthop *nh,
-				  const struct rt6_info *rt)
+				  const struct fib6_info *rt)
 {
 	struct net_device *dev = rt->fib6_nh.nh_dev;
 
@@ -4831,7 +4831,7 @@ static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,
 }
 
 static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp,
-				    const struct rt6_info *rt)
+				    const struct fib6_info *rt)
 {
 	return rt->rt6i_flags & RTF_GATEWAY ||
 	       mlxsw_sp_nexthop6_ipip_type(mlxsw_sp, rt, NULL);
@@ -4862,7 +4862,7 @@ mlxsw_sp_nexthop6_group_create(struct mlxsw_sp *mlxsw_sp,
 	nh_grp->gateway = mlxsw_sp_rt6_is_gateway(mlxsw_sp, mlxsw_sp_rt6->rt);
 	nh_grp->count = fib6_entry->nrt6;
 	for (i = 0; i < nh_grp->count; i++) {
-		struct rt6_info *rt = mlxsw_sp_rt6->rt;
+		struct fib6_info *rt = mlxsw_sp_rt6->rt;
 
 		nh = &nh_grp->nexthops[i];
 		err = mlxsw_sp_nexthop6_init(mlxsw_sp, nh_grp, nh, rt);
@@ -4974,7 +4974,7 @@ mlxsw_sp_nexthop6_group_update(struct mlxsw_sp *mlxsw_sp,
 static int
 mlxsw_sp_fib6_entry_nexthop_add(struct mlxsw_sp *mlxsw_sp,
 				struct mlxsw_sp_fib6_entry *fib6_entry,
-				struct rt6_info *rt)
+				struct fib6_info *rt)
 {
 	struct mlxsw_sp_rt6 *mlxsw_sp_rt6;
 	int err;
@@ -5002,7 +5002,7 @@ mlxsw_sp_fib6_entry_nexthop_add(struct mlxsw_sp *mlxsw_sp,
 static void
 mlxsw_sp_fib6_entry_nexthop_del(struct mlxsw_sp *mlxsw_sp,
 				struct mlxsw_sp_fib6_entry *fib6_entry,
-				struct rt6_info *rt)
+				struct fib6_info *rt)
 {
 	struct mlxsw_sp_rt6 *mlxsw_sp_rt6;
 
@@ -5018,7 +5018,7 @@ mlxsw_sp_fib6_entry_nexthop_del(struct mlxsw_sp *mlxsw_sp,
 
 static void mlxsw_sp_fib6_entry_type_set(struct mlxsw_sp *mlxsw_sp,
 					 struct mlxsw_sp_fib_entry *fib_entry,
-					 const struct rt6_info *rt)
+					 const struct fib6_info *rt)
 {
 	/* Packets hitting RTF_REJECT routes need to be discarded by the
 	 * stack. We can rely on their destination device not having a
@@ -5052,7 +5052,7 @@ mlxsw_sp_fib6_entry_rt_destroy_all(struct mlxsw_sp_fib6_entry *fib6_entry)
 static struct mlxsw_sp_fib6_entry *
 mlxsw_sp_fib6_entry_create(struct mlxsw_sp *mlxsw_sp,
 			   struct mlxsw_sp_fib_node *fib_node,
-			   struct rt6_info *rt)
+			   struct fib6_info *rt)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 	struct mlxsw_sp_fib_entry *fib_entry;
@@ -5102,12 +5102,12 @@ static void mlxsw_sp_fib6_entry_destroy(struct mlxsw_sp *mlxsw_sp,
 
 static struct mlxsw_sp_fib6_entry *
 mlxsw_sp_fib6_node_entry_find(const struct mlxsw_sp_fib_node *fib_node,
-			      const struct rt6_info *nrt, bool replace)
+			      const struct fib6_info *nrt, bool replace)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry, *fallback = NULL;
 
 	list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
-		struct rt6_info *rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
+		struct fib6_info *rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
 
 		if (rt->rt6i_table->tb6_id > nrt->rt6i_table->tb6_id)
 			continue;
@@ -5132,7 +5132,7 @@ mlxsw_sp_fib6_node_list_insert(struct mlxsw_sp_fib6_entry *new6_entry,
 			       bool replace)
 {
 	struct mlxsw_sp_fib_node *fib_node = new6_entry->common.fib_node;
-	struct rt6_info *nrt = mlxsw_sp_fib6_entry_rt(new6_entry);
+	struct fib6_info *nrt = mlxsw_sp_fib6_entry_rt(new6_entry);
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 
 	fib6_entry = mlxsw_sp_fib6_node_entry_find(fib_node, nrt, replace);
@@ -5147,7 +5147,7 @@ mlxsw_sp_fib6_node_list_insert(struct mlxsw_sp_fib6_entry *new6_entry,
 		struct mlxsw_sp_fib6_entry *last;
 
 		list_for_each_entry(last, &fib_node->entry_list, common.list) {
-			struct rt6_info *rt = mlxsw_sp_fib6_entry_rt(last);
+			struct fib6_info *rt = mlxsw_sp_fib6_entry_rt(last);
 
 			if (nrt->rt6i_table->tb6_id > rt->rt6i_table->tb6_id)
 				break;
@@ -5202,7 +5202,7 @@ mlxsw_sp_fib6_node_entry_unlink(struct mlxsw_sp *mlxsw_sp,
 
 static struct mlxsw_sp_fib6_entry *
 mlxsw_sp_fib6_entry_lookup(struct mlxsw_sp *mlxsw_sp,
-			   const struct rt6_info *rt)
+			   const struct fib6_info *rt)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 	struct mlxsw_sp_fib_node *fib_node;
@@ -5221,7 +5221,7 @@ mlxsw_sp_fib6_entry_lookup(struct mlxsw_sp *mlxsw_sp,
 		return NULL;
 
 	list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
-		struct rt6_info *iter_rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
+		struct fib6_info *iter_rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
 
 		if (rt->rt6i_table->tb6_id == iter_rt->rt6i_table->tb6_id &&
 		    rt->rt6i_metric == iter_rt->rt6i_metric &&
@@ -5250,7 +5250,7 @@ static void mlxsw_sp_fib6_entry_replace(struct mlxsw_sp *mlxsw_sp,
 }
 
 static int mlxsw_sp_router_fib6_add(struct mlxsw_sp *mlxsw_sp,
-				    struct rt6_info *rt, bool replace)
+				    struct fib6_info *rt, bool replace)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 	struct mlxsw_sp_fib_node *fib_node;
@@ -5307,7 +5307,7 @@ static int mlxsw_sp_router_fib6_add(struct mlxsw_sp *mlxsw_sp,
 }
 
 static void mlxsw_sp_router_fib6_del(struct mlxsw_sp *mlxsw_sp,
-				     struct rt6_info *rt)
+				     struct fib6_info *rt)
 {
 	struct mlxsw_sp_fib6_entry *fib6_entry;
 	struct mlxsw_sp_fib_node *fib_node;
@@ -5752,7 +5752,7 @@ static void mlxsw_sp_router_fib6_event(struct mlxsw_sp_fib_event_work *fib_work,
 		fen6_info = container_of(info, struct fib6_entry_notifier_info,
 					 info);
 		fib_work->fen6_info = *fen6_info;
-		rt6_hold(fib_work->fen6_info.rt);
+		fib6_info_hold(fib_work->fen6_info.rt);
 		break;
 	}
 }
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index d4088d1a688d..d6089b2e64fe 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -64,7 +64,7 @@ struct inet6_ifaddr {
 	struct delayed_work	dad_work;
 
 	struct inet6_dev	*idev;
-	struct rt6_info		*rt;
+	struct fib6_info	*rt;
 
 	struct hlist_node	addr_lst;
 	struct list_head	if_list;
@@ -144,7 +144,7 @@ struct ipv6_ac_socklist {
 struct ifacaddr6 {
 	struct in6_addr		aca_addr;
 	struct inet6_dev	*aca_idev;
-	struct rt6_info		*aca_rt;
+	struct fib6_info	*aca_rt;
 	struct ifacaddr6	*aca_next;
 	int			aca_users;
 	refcount_t		aca_refcnt;
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 6c3d92bb3459..d41b7bd69fb3 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -75,12 +75,12 @@ struct fib6_node {
 #ifdef CONFIG_IPV6_SUBTREES
 	struct fib6_node __rcu	*subtree;
 #endif
-	struct rt6_info __rcu	*leaf;
+	struct fib6_info __rcu	*leaf;
 
 	__u16			fn_bit;		/* bit key */
 	__u16			fn_flags;
 	int			fn_sernum;
-	struct rt6_info __rcu	*rr_ptr;
+	struct fib6_info __rcu	*rr_ptr;
 	struct rcu_head		rcu;
 };
 
@@ -176,7 +176,7 @@ struct fib6_info {
 struct rt6_info {
 	struct dst_entry		dst;
 	struct rt6_info __rcu		*rt6_next;
-	struct rt6_info			*from;
+	struct fib6_info		*from;
 
 	/*
 	 * Tail elements of dst_entry (__refcnt etc.)
@@ -242,20 +242,20 @@ static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 	return ((struct rt6_info *)dst)->rt6i_idev;
 }
 
-static inline void fib6_clean_expires(struct rt6_info *f6i)
+static inline void fib6_clean_expires(struct fib6_info *f6i)
 {
 	f6i->rt6i_flags &= ~RTF_EXPIRES;
 	f6i->expires = 0;
 }
 
-static inline void fib6_set_expires(struct rt6_info *f6i,
+static inline void fib6_set_expires(struct fib6_info *f6i,
 				    unsigned long expires)
 {
 	f6i->expires = expires;
 	f6i->rt6i_flags |= RTF_EXPIRES;
 }
 
-static inline bool fib6_check_expired(const struct rt6_info *f6i)
+static inline bool fib6_check_expired(const struct fib6_info *f6i)
 {
 	if (f6i->rt6i_flags & RTF_EXPIRES)
 		return time_after(jiffies, f6i->expires);
@@ -288,7 +288,7 @@ static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
  * Return true if we can get cookie safely
  * Return false if not
  */
-static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
+static inline bool rt6_get_cookie_safe(const struct fib6_info *rt,
 				       u32 *cookie)
 {
 	struct fib6_node *fn;
@@ -330,15 +330,15 @@ static inline void ip6_rt_put(struct rt6_info *rt)
 
 void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
 
-struct rt6_info *fib6_info_alloc(gfp_t gfp_flags);
-void fib6_info_destroy(struct rt6_info *f6i);
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
+void fib6_info_destroy(struct fib6_info *f6i);
 
-static inline void fib6_info_hold(struct rt6_info *f6i)
+static inline void fib6_info_hold(struct fib6_info *f6i)
 {
 	atomic_inc(&f6i->rt6i_ref);
 }
 
-static inline void fib6_info_release(struct rt6_info *f6i)
+static inline void fib6_info_release(struct fib6_info *f6i)
 {
 	if (f6i && atomic_dec_and_test(&f6i->rt6i_ref))
 		fib6_info_destroy(f6i);
@@ -371,7 +371,7 @@ enum fib6_walk_state {
 struct fib6_walker {
 	struct list_head lh;
 	struct fib6_node *root, *node;
-	struct rt6_info *leaf;
+	struct fib6_info *leaf;
 	enum fib6_walk_state state;
 	unsigned int skip;
 	unsigned int count;
@@ -435,7 +435,7 @@ typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 
 struct fib6_entry_notifier_info {
 	struct fib_notifier_info info; /* must be first */
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 };
 
 /*
@@ -457,14 +457,14 @@ struct fib6_node *fib6_locate(struct fib6_node *root,
 			      const struct in6_addr *saddr, int src_len,
 			      bool exact_match);
 
-void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
+void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
 		    void *arg);
 
-int fib6_add(struct fib6_node *root, struct rt6_info *rt,
+int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	     struct nl_info *info, struct netlink_ext_ack *extack);
-int fib6_del(struct rt6_info *rt, struct nl_info *info);
+int fib6_del(struct fib6_info *rt, struct nl_info *info);
 
-void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 		     unsigned int flags);
 
 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
@@ -487,11 +487,11 @@ void __net_exit fib6_notifier_exit(struct net *net);
 unsigned int fib6_tables_seq_read(struct net *net);
 int fib6_tables_dump(struct net *net, struct notifier_block *nb);
 
-void fib6_update_sernum(struct net *net, struct rt6_info *rt);
-void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt);
+void fib6_update_sernum(struct net *net, struct fib6_info *rt);
+void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
 
-void fib6_metric_set(struct rt6_info *f6i, int metric, u32 val);
-static inline bool fib6_metric_locked(struct rt6_info *f6i, int metric)
+void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
+static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
 {
 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
 }
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index a06931e529e1..f84aafeb07d0 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -66,7 +66,7 @@ static inline bool rt6_need_strict(const struct in6_addr *daddr)
 		(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 }
 
-static inline bool rt6_qualify_for_ecmp(const struct rt6_info *rt)
+static inline bool rt6_qualify_for_ecmp(const struct fib6_info *rt)
 {
 	return (rt->rt6i_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) ==
 	       RTF_GATEWAY;
@@ -102,14 +102,14 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 
 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
 		  struct netlink_ext_ack *extack);
-int ip6_ins_rt(struct net *net, struct rt6_info *rt);
-int ip6_del_rt(struct net *net, struct rt6_info *rt);
+int ip6_ins_rt(struct net *net, struct fib6_info *rt);
+int ip6_del_rt(struct net *net, struct fib6_info *rt);
 
-void rt6_flush_exceptions(struct rt6_info *rt);
-void rt6_age_exceptions(struct rt6_info *rt, struct fib6_gc_args *gc_args,
+void rt6_flush_exceptions(struct fib6_info *rt);
+void rt6_age_exceptions(struct fib6_info *rt, struct fib6_gc_args *gc_args,
 			unsigned long now);
 
-static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
+static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *rt,
 				      const struct in6_addr *daddr,
 				      unsigned int prefs,
 				      struct in6_addr *saddr)
@@ -136,9 +136,9 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 
 void fib6_force_start_gc(struct net *net);
 
-struct rt6_info *addrconf_dst_alloc(struct net *net, struct inet6_dev *idev,
-				    const struct in6_addr *addr, bool anycast,
-				    gfp_t gfp_flags);
+struct fib6_info *addrconf_dst_alloc(struct net *net, struct inet6_dev *idev,
+				     const struct in6_addr *addr, bool anycast,
+				     gfp_t gfp_flags);
 
 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 			       int flags);
@@ -147,10 +147,10 @@ struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
  *	support functions for ND
  *
  */
-struct rt6_info *rt6_get_dflt_router(struct net *net,
+struct fib6_info *rt6_get_dflt_router(struct net *net,
 				     const struct in6_addr *addr,
 				     struct net_device *dev);
-struct rt6_info *rt6_add_dflt_router(struct net *net,
+struct fib6_info *rt6_add_dflt_router(struct net *net,
 				     const struct in6_addr *gwaddr,
 				     struct net_device *dev, unsigned int pref);
 
@@ -176,14 +176,14 @@ struct rt6_rtnl_dump_arg {
 	struct net *net;
 };
 
-int rt6_dump_route(struct rt6_info *rt, void *p_arg);
+int rt6_dump_route(struct fib6_info *rt, void *p_arg);
 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
 void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
 void rt6_disable_ip(struct net_device *dev, unsigned long event);
 void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
-void rt6_multipath_rebalance(struct rt6_info *rt);
+void rt6_multipath_rebalance(struct fib6_info *rt);
 
 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
 {
@@ -265,7 +265,7 @@ static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
 		return daddr;
 }
 
-static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
+static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
 {
 	return a->fib6_nh.nh_dev == b->fib6_nh.nh_dev &&
 	       a->rt6i_idev == b->rt6i_idev &&
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 7996b19c8a6d..7d84d609aae2 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -60,7 +60,7 @@ struct netns_ipv6 {
 #endif
 	struct xt_table		*ip6table_nat;
 #endif
-	struct rt6_info         *fib6_null_entry;
+	struct fib6_info	*fib6_null_entry;
 	struct rt6_info		*ip6_null_entry;
 	struct rt6_statistics   *rt6_stats;
 	struct timer_list       ip6_fib_timer;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 7dbd44958cd4..f38a166787d3 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -179,7 +179,7 @@ static void addrconf_type_change(struct net_device *dev,
 				 unsigned long event);
 static int addrconf_ifdown(struct net_device *dev, int how);
 
-static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 						  int plen,
 						  const struct net_device *dev,
 						  u32 flags, u32 noflags);
@@ -1005,7 +1005,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 	gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
 	struct net *net = dev_net(idev->dev);
 	struct inet6_ifaddr *ifa = NULL;
-	struct rt6_info *rt = NULL;
+	struct fib6_info *rt = NULL;
 	int err = 0;
 	int addr_type = ipv6_addr_type(addr);
 
@@ -1190,7 +1190,7 @@ check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
 static void
 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
 {
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 	rt = addrconf_get_prefix_route(&ifp->addr,
 				       ifp->prefix_len,
@@ -2360,13 +2360,13 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
 }
 
 
-static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 						  int plen,
 						  const struct net_device *dev,
 						  u32 flags, u32 noflags)
 {
 	struct fib6_node *fn;
-	struct rt6_info *rt = NULL;
+	struct fib6_info *rt = NULL;
 	struct fib6_table *table;
 	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
 
@@ -2654,7 +2654,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 	 */
 
 	if (pinfo->onlink) {
-		struct rt6_info *rt;
+		struct fib6_info *rt;
 		unsigned long rt_expires;
 
 		/* Avoid arithmetic overflow. Really, we could
@@ -3354,7 +3354,7 @@ static int fixup_permanent_addr(struct net *net,
 	 * case regenerate the host route.
 	 */
 	if (!ifp->rt || !ifp->rt->rt6i_node) {
-		struct rt6_info *rt, *prev;
+		struct fib6_info *rt, *prev;
 
 		rt = addrconf_dst_alloc(net, idev, &ifp->addr, false,
 					GFP_ATOMIC);
@@ -3721,7 +3721,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
 
 	list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
-		struct rt6_info *rt = NULL;
+		struct fib6_info *rt = NULL;
 		bool keep;
 
 		addrconf_del_dad_work(ifa);
@@ -5643,7 +5643,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 			addrconf_leave_anycast(ifp);
 		addrconf_leave_solict(ifp->idev, &ifp->addr);
 		if (!ipv6_addr_any(&ifp->peer_addr)) {
-			struct rt6_info *rt;
+			struct fib6_info *rt;
 
 			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
 						       ifp->idev->dev, 0, 0);
@@ -5999,7 +5999,7 @@ void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
 	list_for_each_entry(ifa, &idev->addr_list, if_list) {
 		spin_lock(&ifa->lock);
 		if (ifa->rt) {
-			struct rt6_info *rt = ifa->rt;
+			struct fib6_info *rt = ifa->rt;
 			int cpu;
 
 			rcu_read_lock();
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 37b1a5805905..52524ecc079e 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -218,7 +218,7 @@ static void aca_put(struct ifacaddr6 *ac)
 	}
 }
 
-static struct ifacaddr6 *aca_alloc(struct rt6_info *rt,
+static struct ifacaddr6 *aca_alloc(struct fib6_info *rt,
 				   const struct in6_addr *addr)
 {
 	struct inet6_dev *idev = rt->rt6i_idev;
@@ -247,7 +247,7 @@ static struct ifacaddr6 *aca_alloc(struct rt6_info *rt,
 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
 {
 	struct ifacaddr6 *aca;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	struct net *net;
 	int err;
 
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 0a3ad574318a..d07dd75ff8cc 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -43,7 +43,7 @@ static struct kmem_cache *fib6_node_kmem __read_mostly;
 struct fib6_cleaner {
 	struct fib6_walker w;
 	struct net *net;
-	int (*func)(struct rt6_info *, void *arg);
+	int (*func)(struct fib6_info *, void *arg);
 	int sernum;
 	void *arg;
 };
@@ -54,7 +54,7 @@ struct fib6_cleaner {
 #define FWS_INIT FWS_L
 #endif
 
-static struct rt6_info *fib6_find_prefix(struct net *net,
+static struct fib6_info *fib6_find_prefix(struct net *net,
 					 struct fib6_table *table,
 					 struct fib6_node *fn);
 static struct fib6_node *fib6_repair_tree(struct net *net,
@@ -105,7 +105,7 @@ enum {
 	FIB6_NO_SERNUM_CHANGE = 0,
 };
 
-void fib6_update_sernum(struct net *net, struct rt6_info *rt)
+void fib6_update_sernum(struct net *net, struct fib6_info *rt)
 {
 	struct fib6_node *fn;
 
@@ -145,9 +145,9 @@ static __be32 addr_bit_set(const void *token, int fn_bit)
 	       addr[fn_bit >> 5];
 }
 
-struct rt6_info *fib6_info_alloc(gfp_t gfp_flags)
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags)
 {
-	struct rt6_info *f6i;
+	struct fib6_info *f6i;
 
 	f6i = kzalloc(sizeof(*f6i), gfp_flags);
 	if (!f6i)
@@ -167,7 +167,7 @@ struct rt6_info *fib6_info_alloc(gfp_t gfp_flags)
 	return f6i;
 }
 
-void fib6_info_destroy(struct rt6_info *f6i)
+void fib6_info_destroy(struct fib6_info *f6i)
 {
 	struct rt6_exception_bucket *bucket;
 
@@ -399,7 +399,7 @@ unsigned int fib6_tables_seq_read(struct net *net)
 
 static int call_fib6_entry_notifier(struct notifier_block *nb, struct net *net,
 				    enum fib_event_type event_type,
-				    struct rt6_info *rt)
+				    struct fib6_info *rt)
 {
 	struct fib6_entry_notifier_info info = {
 		.rt = rt,
@@ -410,7 +410,7 @@ static int call_fib6_entry_notifier(struct notifier_block *nb, struct net *net,
 
 static int call_fib6_entry_notifiers(struct net *net,
 				     enum fib_event_type event_type,
-				     struct rt6_info *rt,
+				     struct fib6_info *rt,
 				     struct netlink_ext_ack *extack)
 {
 	struct fib6_entry_notifier_info info = {
@@ -427,7 +427,7 @@ struct fib6_dump_arg {
 	struct notifier_block *nb;
 };
 
-static void fib6_rt_dump(struct rt6_info *rt, struct fib6_dump_arg *arg)
+static void fib6_rt_dump(struct fib6_info *rt, struct fib6_dump_arg *arg)
 {
 	if (rt == arg->net->ipv6.fib6_null_entry)
 		return;
@@ -436,7 +436,7 @@ static void fib6_rt_dump(struct rt6_info *rt, struct fib6_dump_arg *arg)
 
 static int fib6_node_dump(struct fib6_walker *w)
 {
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 	for_each_fib6_walker_rt(w)
 		fib6_rt_dump(rt, w->args);
@@ -485,7 +485,7 @@ int fib6_tables_dump(struct net *net, struct notifier_block *nb)
 static int fib6_dump_node(struct fib6_walker *w)
 {
 	int res;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 	for_each_fib6_walker_rt(w) {
 		res = rt6_dump_route(rt, w->args);
@@ -502,7 +502,7 @@ static int fib6_dump_node(struct fib6_walker *w)
 		 */
 		if (rt->rt6i_nsiblings)
 			rt = list_last_entry(&rt->rt6i_siblings,
-					     struct rt6_info,
+					     struct fib6_info,
 					     rt6i_siblings);
 	}
 	w->leaf = NULL;
@@ -638,7 +638,7 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 	return res;
 }
 
-void fib6_metric_set(struct rt6_info *f6i, int metric, u32 val)
+void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val)
 {
 	if (!f6i)
 		return;
@@ -685,7 +685,7 @@ static struct fib6_node *fib6_add_1(struct net *net,
 	fn = root;
 
 	do {
-		struct rt6_info *leaf = rcu_dereference_protected(fn->leaf,
+		struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
 					    lockdep_is_held(&table->tb6_lock));
 		key = (struct rt6key *)((u8 *)leaf + offset);
 
@@ -879,7 +879,7 @@ static struct fib6_node *fib6_add_1(struct net *net,
 	return ln;
 }
 
-static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
+static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn,
 			  struct net *net)
 {
 	struct fib6_table *table = rt->rt6i_table;
@@ -892,9 +892,9 @@ static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
 		 * to still alive ones.
 		 */
 		while (fn) {
-			struct rt6_info *leaf = rcu_dereference_protected(fn->leaf,
+			struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
 					    lockdep_is_held(&table->tb6_lock));
-			struct rt6_info *new_leaf;
+			struct fib6_info *new_leaf;
 			if (!(fn->fn_flags & RTN_RTINFO) && leaf == rt) {
 				new_leaf = fib6_find_prefix(net, table, fn);
 				atomic_inc(&new_leaf->rt6i_ref);
@@ -931,15 +931,15 @@ static void fib6_purge_rt(struct rt6_info *rt, struct fib6_node *fn,
  *	Insert routing information in a node.
  */
 
-static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
+static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
 			    struct nl_info *info,
 			    struct netlink_ext_ack *extack)
 {
-	struct rt6_info *leaf = rcu_dereference_protected(fn->leaf,
+	struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
 				    lockdep_is_held(&rt->rt6i_table->tb6_lock));
-	struct rt6_info *iter = NULL;
-	struct rt6_info __rcu **ins;
-	struct rt6_info __rcu **fallback_ins = NULL;
+	struct fib6_info *iter = NULL;
+	struct fib6_info __rcu **ins;
+	struct fib6_info __rcu **fallback_ins = NULL;
 	int replace = (info->nlh &&
 		       (info->nlh->nlmsg_flags & NLM_F_REPLACE));
 	int add = (!info->nlh ||
@@ -1029,7 +1029,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 	/* Link this route to others same route. */
 	if (rt->rt6i_nsiblings) {
 		unsigned int rt6i_nsiblings;
-		struct rt6_info *sibling, *temp_sibling;
+		struct fib6_info *sibling, *temp_sibling;
 
 		/* Find the first route that have the same metric */
 		sibling = leaf;
@@ -1142,7 +1142,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 	return 0;
 }
 
-static void fib6_start_gc(struct net *net, struct rt6_info *rt)
+static void fib6_start_gc(struct net *net, struct fib6_info *rt)
 {
 	if (!timer_pending(&net->ipv6.ip6_fib_timer) &&
 	    (rt->rt6i_flags & RTF_EXPIRES))
@@ -1157,7 +1157,7 @@ void fib6_force_start_gc(struct net *net)
 			  jiffies + net->ipv6.sysctl.ip6_rt_gc_interval);
 }
 
-static void __fib6_update_sernum_upto_root(struct rt6_info *rt,
+static void __fib6_update_sernum_upto_root(struct fib6_info *rt,
 					   int sernum)
 {
 	struct fib6_node *fn = rcu_dereference_protected(rt->rt6i_node,
@@ -1172,7 +1172,7 @@ static void __fib6_update_sernum_upto_root(struct rt6_info *rt,
 	}
 }
 
-void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt)
+void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt)
 {
 	__fib6_update_sernum_upto_root(rt, fib6_new_sernum(net));
 }
@@ -1184,7 +1184,7 @@ void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt)
  *	Need to own table->tb6_lock
  */
 
-int fib6_add(struct fib6_node *root, struct rt6_info *rt,
+int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	     struct nl_info *info, struct netlink_ext_ack *extack)
 {
 	struct fib6_table *table = rt->rt6i_table;
@@ -1205,7 +1205,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 
 	fn = fib6_add_1(info->nl_net, table, root,
 			&rt->rt6i_dst.addr, rt->rt6i_dst.plen,
-			offsetof(struct rt6_info, rt6i_dst), allow_create,
+			offsetof(struct fib6_info, rt6i_dst), allow_create,
 			replace_required, extack);
 	if (IS_ERR(fn)) {
 		err = PTR_ERR(fn);
@@ -1246,7 +1246,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 
 			sn = fib6_add_1(info->nl_net, table, sfn,
 					&rt->rt6i_src.addr, rt->rt6i_src.plen,
-					offsetof(struct rt6_info, rt6i_src),
+					offsetof(struct fib6_info, rt6i_src),
 					allow_create, replace_required, extack);
 
 			if (IS_ERR(sn)) {
@@ -1265,7 +1265,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 		} else {
 			sn = fib6_add_1(info->nl_net, table, FIB6_SUBTREE(fn),
 					&rt->rt6i_src.addr, rt->rt6i_src.plen,
-					offsetof(struct rt6_info, rt6i_src),
+					offsetof(struct fib6_info, rt6i_src),
 					allow_create, replace_required, extack);
 
 			if (IS_ERR(sn)) {
@@ -1302,7 +1302,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
 		 * super-tree leaf node we have to find a new one for it.
 		 */
 		if (pn != fn) {
-			struct rt6_info *pn_leaf =
+			struct fib6_info *pn_leaf =
 				rcu_dereference_protected(pn->leaf,
 				    lockdep_is_held(&table->tb6_lock));
 			if (pn_leaf == rt) {
@@ -1351,7 +1351,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
  */
 
 struct lookup_args {
-	int			offset;		/* key offset on rt6_info	*/
+	int			offset;		/* key offset on fib6_info */
 	const struct in6_addr	*addr;		/* search key			*/
 };
 
@@ -1389,7 +1389,7 @@ static struct fib6_node *fib6_lookup_1(struct fib6_node *root,
 		struct fib6_node *subtree = FIB6_SUBTREE(fn);
 
 		if (subtree || fn->fn_flags & RTN_RTINFO) {
-			struct rt6_info *leaf = rcu_dereference(fn->leaf);
+			struct fib6_info *leaf = rcu_dereference(fn->leaf);
 			struct rt6key *key;
 
 			if (!leaf)
@@ -1429,12 +1429,12 @@ struct fib6_node *fib6_lookup(struct fib6_node *root, const struct in6_addr *dad
 	struct fib6_node *fn;
 	struct lookup_args args[] = {
 		{
-			.offset = offsetof(struct rt6_info, rt6i_dst),
+			.offset = offsetof(struct fib6_info, rt6i_dst),
 			.addr = daddr,
 		},
 #ifdef CONFIG_IPV6_SUBTREES
 		{
-			.offset = offsetof(struct rt6_info, rt6i_src),
+			.offset = offsetof(struct fib6_info, rt6i_src),
 			.addr = saddr,
 		},
 #endif
@@ -1470,7 +1470,7 @@ static struct fib6_node *fib6_locate_1(struct fib6_node *root,
 	struct fib6_node *fn, *prev = NULL;
 
 	for (fn = root; fn ; ) {
-		struct rt6_info *leaf = rcu_dereference(fn->leaf);
+		struct fib6_info *leaf = rcu_dereference(fn->leaf);
 		struct rt6key *key;
 
 		/* This node is being deleted */
@@ -1519,7 +1519,7 @@ struct fib6_node *fib6_locate(struct fib6_node *root,
 	struct fib6_node *fn;
 
 	fn = fib6_locate_1(root, daddr, dst_len,
-			   offsetof(struct rt6_info, rt6i_dst),
+			   offsetof(struct fib6_info, rt6i_dst),
 			   exact_match);
 
 #ifdef CONFIG_IPV6_SUBTREES
@@ -1530,7 +1530,7 @@ struct fib6_node *fib6_locate(struct fib6_node *root,
 
 			if (subtree) {
 				fn = fib6_locate_1(subtree, saddr, src_len,
-					   offsetof(struct rt6_info, rt6i_src),
+					   offsetof(struct fib6_info, rt6i_src),
 					   exact_match);
 			}
 		}
@@ -1549,7 +1549,7 @@ struct fib6_node *fib6_locate(struct fib6_node *root,
  *
  */
 
-static struct rt6_info *fib6_find_prefix(struct net *net,
+static struct fib6_info *fib6_find_prefix(struct net *net,
 					 struct fib6_table *table,
 					 struct fib6_node *fn)
 {
@@ -1608,11 +1608,11 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 					    lockdep_is_held(&table->tb6_lock));
 		struct fib6_node *pn_l = rcu_dereference_protected(pn->left,
 					    lockdep_is_held(&table->tb6_lock));
-		struct rt6_info *fn_leaf = rcu_dereference_protected(fn->leaf,
+		struct fib6_info *fn_leaf = rcu_dereference_protected(fn->leaf,
 					    lockdep_is_held(&table->tb6_lock));
-		struct rt6_info *pn_leaf = rcu_dereference_protected(pn->leaf,
+		struct fib6_info *pn_leaf = rcu_dereference_protected(pn->leaf,
 					    lockdep_is_held(&table->tb6_lock));
-		struct rt6_info *new_fn_leaf;
+		struct fib6_info *new_fn_leaf;
 
 		RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter);
 		iter++;
@@ -1703,10 +1703,10 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 }
 
 static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
-			   struct rt6_info __rcu **rtp, struct nl_info *info)
+			   struct fib6_info __rcu **rtp, struct nl_info *info)
 {
 	struct fib6_walker *w;
-	struct rt6_info *rt = rcu_dereference_protected(*rtp,
+	struct fib6_info *rt = rcu_dereference_protected(*rtp,
 				    lockdep_is_held(&table->tb6_lock));
 	struct net *net = info->nl_net;
 
@@ -1727,7 +1727,7 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 
 	/* Remove this entry from other siblings */
 	if (rt->rt6i_nsiblings) {
-		struct rt6_info *sibling, *next_sibling;
+		struct fib6_info *sibling, *next_sibling;
 
 		list_for_each_entry_safe(sibling, next_sibling,
 					 &rt->rt6i_siblings, rt6i_siblings)
@@ -1771,14 +1771,14 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 }
 
 /* Need to own table->tb6_lock */
-int fib6_del(struct rt6_info *rt, struct nl_info *info)
+int fib6_del(struct fib6_info *rt, struct nl_info *info)
 {
 	struct fib6_node *fn = rcu_dereference_protected(rt->rt6i_node,
 				    lockdep_is_held(&rt->rt6i_table->tb6_lock));
 	struct fib6_table *table = rt->rt6i_table;
 	struct net *net = info->nl_net;
-	struct rt6_info __rcu **rtp;
-	struct rt6_info __rcu **rtp_next;
+	struct fib6_info __rcu **rtp;
+	struct fib6_info __rcu **rtp_next;
 
 	if (!fn || rt == net->ipv6.fib6_null_entry)
 		return -ENOENT;
@@ -1790,7 +1790,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
 	 */
 
 	for (rtp = &fn->leaf; *rtp; rtp = rtp_next) {
-		struct rt6_info *cur = rcu_dereference_protected(*rtp,
+		struct fib6_info *cur = rcu_dereference_protected(*rtp,
 					lockdep_is_held(&table->tb6_lock));
 		if (rt == cur) {
 			fib6_del_route(table, fn, rtp, info);
@@ -1934,7 +1934,7 @@ static int fib6_walk(struct net *net, struct fib6_walker *w)
 static int fib6_clean_node(struct fib6_walker *w)
 {
 	int res;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	struct fib6_cleaner *c = container_of(w, struct fib6_cleaner, w);
 	struct nl_info info = {
 		.nl_net = c->net,
@@ -1969,7 +1969,7 @@ static int fib6_clean_node(struct fib6_walker *w)
 			if (WARN_ON(!rt->rt6i_nsiblings))
 				continue;
 			rt = list_last_entry(&rt->rt6i_siblings,
-					     struct rt6_info, rt6i_siblings);
+					     struct fib6_info, rt6i_siblings);
 			continue;
 		}
 		WARN_ON(res != 0);
@@ -1988,7 +1988,7 @@ static int fib6_clean_node(struct fib6_walker *w)
  */
 
 static void fib6_clean_tree(struct net *net, struct fib6_node *root,
-			    int (*func)(struct rt6_info *, void *arg),
+			    int (*func)(struct fib6_info *, void *arg),
 			    int sernum, void *arg)
 {
 	struct fib6_cleaner c;
@@ -2006,7 +2006,7 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
 }
 
 static void __fib6_clean_all(struct net *net,
-			     int (*func)(struct rt6_info *, void *),
+			     int (*func)(struct fib6_info *, void *),
 			     int sernum, void *arg)
 {
 	struct fib6_table *table;
@@ -2026,7 +2026,7 @@ static void __fib6_clean_all(struct net *net,
 	rcu_read_unlock();
 }
 
-void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *),
+void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *),
 		    void *arg)
 {
 	__fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg);
@@ -2043,7 +2043,7 @@ static void fib6_flush_trees(struct net *net)
  *	Garbage collection
  */
 
-static int fib6_age(struct rt6_info *rt, void *arg)
+static int fib6_age(struct fib6_info *rt, void *arg)
 {
 	struct fib6_gc_args *gc_args = arg;
 	unsigned long now = jiffies;
@@ -2248,7 +2248,7 @@ struct ipv6_route_iter {
 
 static int ipv6_route_seq_show(struct seq_file *seq, void *v)
 {
-	struct rt6_info *rt = v;
+	struct fib6_info *rt = v;
 	struct ipv6_route_iter *iter = seq->private;
 	const struct net_device *dev;
 
@@ -2340,14 +2340,14 @@ static void ipv6_route_check_sernum(struct ipv6_route_iter *iter)
 static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	int r;
-	struct rt6_info *n;
+	struct fib6_info *n;
 	struct net *net = seq_file_net(seq);
 	struct ipv6_route_iter *iter = seq->private;
 
 	if (!v)
 		goto iter_table;
 
-	n = rcu_dereference_bh(((struct rt6_info *)v)->rt6_next);
+	n = rcu_dereference_bh(((struct fib6_info *)v)->rt6_next);
 	if (n) {
 		++*pos;
 		return n;
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index c22670f56b47..7186c1291e51 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1155,7 +1155,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
 	struct neighbour *neigh = NULL;
 	struct inet6_dev *in6_dev;
-	struct rt6_info *rt = NULL;
+	struct fib6_info *rt = NULL;
 	struct net *net;
 	int lifetime;
 	struct ndisc_options ndopts;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index cd4210a58ab8..f02ff954aa2b 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -96,24 +96,24 @@ static void		ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 					   struct sk_buff *skb, u32 mtu);
 static void		rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
 					struct sk_buff *skb);
-static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
-static size_t rt6_nlmsg_size(struct rt6_info *rt);
+static int rt6_score_route(struct fib6_info *rt, int oif, int strict);
+static size_t rt6_nlmsg_size(struct fib6_info *rt);
 static int rt6_fill_node(struct net *net, struct sk_buff *skb,
-			 struct rt6_info *rt, struct dst_entry *dst,
+			 struct fib6_info *rt, struct dst_entry *dst,
 			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
 			 unsigned int flags);
-static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
+static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
 					   struct in6_addr *daddr,
 					   struct in6_addr *saddr);
 
 #ifdef CONFIG_IPV6_ROUTE_INFO
-static struct rt6_info *rt6_add_route_info(struct net *net,
+static struct fib6_info *rt6_add_route_info(struct net *net,
 					   const struct in6_addr *prefix, int prefixlen,
 					   const struct in6_addr *gwaddr,
 					   struct net_device *dev,
 					   unsigned int pref);
-static struct rt6_info *rt6_get_route_info(struct net *net,
+static struct fib6_info *rt6_get_route_info(struct net *net,
 					   const struct in6_addr *prefix, int prefixlen,
 					   const struct in6_addr *gwaddr,
 					   struct net_device *dev);
@@ -283,7 +283,7 @@ static const u32 ip6_template_metrics[RTAX_MAX] = {
 	[RTAX_HOPLIMIT - 1] = 0,
 };
 
-static const struct rt6_info fib6_null_entry_template = {
+static const struct fib6_info fib6_null_entry_template = {
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
 	.rt6i_protocol  = RTPROT_KERNEL,
 	.rt6i_metric	= ~(u32)0,
@@ -372,7 +372,7 @@ EXPORT_SYMBOL(ip6_dst_alloc);
 static void ip6_dst_destroy(struct dst_entry *dst)
 {
 	struct rt6_info *rt = (struct rt6_info *)dst;
-	struct rt6_info *from = rt->from;
+	struct fib6_info *from = rt->from;
 	struct inet6_dev *idev;
 
 	dst_destroy_metrics_generic(dst);
@@ -425,13 +425,13 @@ static bool rt6_check_expired(const struct rt6_info *rt)
 	return false;
 }
 
-static struct rt6_info *rt6_multipath_select(const struct net *net,
-					     struct rt6_info *match,
+static struct fib6_info *rt6_multipath_select(const struct net *net,
+					      struct fib6_info *match,
 					     struct flowi6 *fl6, int oif,
 					     const struct sk_buff *skb,
 					     int strict)
 {
-	struct rt6_info *sibling, *next_sibling;
+	struct fib6_info *sibling, *next_sibling;
 
 	/* We might have already computed the hash for ICMPv6 errors. In such
 	 * case it will always be non-zero. Otherwise now is the time to do it.
@@ -462,14 +462,14 @@ static struct rt6_info *rt6_multipath_select(const struct net *net,
  *	Route lookup. rcu_read_lock() should be held.
  */
 
-static inline struct rt6_info *rt6_device_match(struct net *net,
-						    struct rt6_info *rt,
+static inline struct fib6_info *rt6_device_match(struct net *net,
+						 struct fib6_info *rt,
 						    const struct in6_addr *saddr,
 						    int oif,
 						    int flags)
 {
-	struct rt6_info *local = NULL;
-	struct rt6_info *sprt;
+	struct fib6_info *local = NULL;
+	struct fib6_info *sprt;
 
 	if (!oif && ipv6_addr_any(saddr) &&
 	    !(rt->fib6_nh.nh_flags & RTNH_F_DEAD))
@@ -532,7 +532,7 @@ static void rt6_probe_deferred(struct work_struct *w)
 	kfree(work);
 }
 
-static void rt6_probe(struct rt6_info *rt)
+static void rt6_probe(struct fib6_info *rt)
 {
 	struct __rt6_probe_work *work;
 	const struct in6_addr *nh_gw;
@@ -585,7 +585,7 @@ static void rt6_probe(struct rt6_info *rt)
 	rcu_read_unlock_bh();
 }
 #else
-static inline void rt6_probe(struct rt6_info *rt)
+static inline void rt6_probe(struct fib6_info *rt)
 {
 }
 #endif
@@ -593,7 +593,7 @@ static inline void rt6_probe(struct rt6_info *rt)
 /*
  * Default Router Selection (RFC 2461 6.3.6)
  */
-static inline int rt6_check_dev(struct rt6_info *rt, int oif)
+static inline int rt6_check_dev(struct fib6_info *rt, int oif)
 {
 	const struct net_device *dev = rt->fib6_nh.nh_dev;
 
@@ -605,7 +605,7 @@ static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 	return 0;
 }
 
-static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
+static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
 {
 	enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
 	struct neighbour *neigh;
@@ -637,8 +637,7 @@ static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
 	return ret;
 }
 
-static int rt6_score_route(struct rt6_info *rt, int oif,
-			   int strict)
+static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
 {
 	int m;
 
@@ -656,8 +655,8 @@ static int rt6_score_route(struct rt6_info *rt, int oif,
 	return m;
 }
 
-static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
-				   int *mpri, struct rt6_info *match,
+static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
+				   int *mpri, struct fib6_info *match,
 				   bool *do_rr)
 {
 	int m;
@@ -696,13 +695,13 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 	return match;
 }
 
-static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
-				     struct rt6_info *leaf,
-				     struct rt6_info *rr_head,
+static struct fib6_info *find_rr_leaf(struct fib6_node *fn,
+				     struct fib6_info *leaf,
+				     struct fib6_info *rr_head,
 				     u32 metric, int oif, int strict,
 				     bool *do_rr)
 {
-	struct rt6_info *rt, *match, *cont;
+	struct fib6_info *rt, *match, *cont;
 	int mpri = -1;
 
 	match = NULL;
@@ -735,11 +734,11 @@ static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
 	return match;
 }
 
-static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
+static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
 				   int oif, int strict)
 {
-	struct rt6_info *leaf = rcu_dereference(fn->leaf);
-	struct rt6_info *match, *rt0;
+	struct fib6_info *leaf = rcu_dereference(fn->leaf);
+	struct fib6_info *match, *rt0;
 	bool do_rr = false;
 	int key_plen;
 
@@ -767,7 +766,7 @@ static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
 			     &do_rr);
 
 	if (do_rr) {
-		struct rt6_info *next = rcu_dereference(rt0->rt6_next);
+		struct fib6_info *next = rcu_dereference(rt0->rt6_next);
 
 		/* no entries matched; do round-robin */
 		if (!next || next->rt6i_metric != rt0->rt6i_metric)
@@ -785,7 +784,7 @@ static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
 	return match ? match : net->ipv6.fib6_null_entry;
 }
 
-static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
+static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
 {
 	return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
 }
@@ -799,7 +798,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 	struct in6_addr prefix_buf, *prefix;
 	unsigned int pref;
 	unsigned long lifetime;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 	if (len < sizeof(struct route_info)) {
 		return -EINVAL;
@@ -871,7 +870,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
  */
 
 /* called with rcu_lock held */
-static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
+static struct net_device *ip6_rt_get_dev_rcu(struct fib6_info *rt)
 {
 	struct net_device *dev = rt->fib6_nh.nh_dev;
 
@@ -913,7 +912,7 @@ static int ip6_rt_type_to_error(u8 fib6_type)
 	return fib6_prop[fib6_type];
 }
 
-static unsigned short fib6_info_dst_flags(struct rt6_info *rt)
+static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
 {
 	unsigned short flags = 0;
 
@@ -927,7 +926,7 @@ static unsigned short fib6_info_dst_flags(struct rt6_info *rt)
 	return flags;
 }
 
-static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
+static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
 {
 	rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
 
@@ -949,7 +948,7 @@ static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct rt6_info *ort)
 	}
 }
 
-static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
+static void ip6_rt_init_dst(struct rt6_info *rt, struct fib6_info *ort)
 {
 	rt->dst.flags |= fib6_info_dst_flags(ort);
 
@@ -977,7 +976,7 @@ static void ip6_rt_init_dst(struct rt6_info *rt, struct rt6_info *ort)
 	rt->dst.lastuse = jiffies;
 }
 
-static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
+static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
 {
 	rt->rt6i_flags &= ~RTF_EXPIRES;
 	fib6_info_hold(from);
@@ -989,7 +988,7 @@ static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 	}
 }
 
-static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
+static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
 {
 	ip6_rt_init_dst(rt, ort);
 
@@ -1045,7 +1044,7 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
 }
 
 /* called with rcu_lock held */
-static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
+static struct rt6_info *ip6_create_rt_rcu(struct fib6_info *rt)
 {
 	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
@@ -1065,7 +1064,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 					     const struct sk_buff *skb,
 					     int flags)
 {
-	struct rt6_info *f6i;
+	struct fib6_info *f6i;
 	struct fib6_node *fn;
 	struct rt6_info *rt;
 
@@ -1143,7 +1142,7 @@ EXPORT_SYMBOL(rt6_lookup);
  * Caller must hold dst before calling it.
  */
 
-static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
+static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
 			struct netlink_ext_ack *extack)
 {
 	int err;
@@ -1157,14 +1156,14 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
 	return err;
 }
 
-int ip6_ins_rt(struct net *net, struct rt6_info *rt)
+int ip6_ins_rt(struct net *net, struct fib6_info *rt)
 {
 	struct nl_info info = {	.nl_net = net, };
 
 	return __ip6_ins_rt(rt, &info, NULL);
 }
 
-static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
+static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
 					   const struct in6_addr *daddr,
 					   const struct in6_addr *saddr)
 {
@@ -1204,7 +1203,7 @@ static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 	return rt;
 }
 
-static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
+static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
 {
 	unsigned short flags = fib6_info_dst_flags(rt);
 	struct net_device *dev;
@@ -1223,7 +1222,7 @@ static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
 }
 
 /* It should be called with rcu_read_lock() acquired */
-static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
+static struct rt6_info *rt6_get_pcpu_route(struct fib6_info *rt)
 {
 	struct rt6_info *pcpu_rt, **p;
 
@@ -1237,7 +1236,7 @@ static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
 }
 
 static struct rt6_info *rt6_make_pcpu_route(struct net *net,
-					    struct rt6_info *rt)
+					    struct fib6_info *rt)
 {
 	struct rt6_info *pcpu_rt, *prev, **p;
 
@@ -1381,7 +1380,7 @@ __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
 	return NULL;
 }
 
-static unsigned int fib6_mtu(const struct rt6_info *rt)
+static unsigned int fib6_mtu(const struct fib6_info *rt)
 {
 	unsigned int mtu;
 
@@ -1392,7 +1391,7 @@ static unsigned int fib6_mtu(const struct rt6_info *rt)
 }
 
 static int rt6_insert_exception(struct rt6_info *nrt,
-				struct rt6_info *ort)
+				struct fib6_info *ort)
 {
 	struct net *net = dev_net(nrt->dst.dev);
 	struct rt6_exception_bucket *bucket;
@@ -1478,7 +1477,7 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	return err;
 }
 
-void rt6_flush_exceptions(struct rt6_info *rt)
+void rt6_flush_exceptions(struct fib6_info *rt)
 {
 	struct rt6_exception_bucket *bucket;
 	struct rt6_exception *rt6_ex;
@@ -1508,7 +1507,7 @@ void rt6_flush_exceptions(struct rt6_info *rt)
 /* Find cached rt in the hash table inside passed in rt
  * Caller has to hold rcu_read_lock()
  */
-static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
+static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
 					   struct in6_addr *daddr,
 					   struct in6_addr *saddr)
 {
@@ -1541,7 +1540,7 @@ static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
 static int rt6_remove_exception_rt(struct rt6_info *rt)
 {
 	struct rt6_exception_bucket *bucket;
-	struct rt6_info *from = rt->from;
+	struct fib6_info *from = rt->from;
 	struct in6_addr *src_key = NULL;
 	struct rt6_exception *rt6_ex;
 	int err;
@@ -1586,7 +1585,7 @@ static int rt6_remove_exception_rt(struct rt6_info *rt)
 static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
 {
 	struct rt6_exception_bucket *bucket;
-	struct rt6_info *from = rt->from;
+	struct fib6_info *from = rt->from;
 	struct in6_addr *src_key = NULL;
 	struct rt6_exception *rt6_ex;
 
@@ -1616,7 +1615,7 @@ static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
 	rcu_read_unlock();
 }
 
-static void rt6_exceptions_remove_prefsrc(struct rt6_info *rt)
+static void rt6_exceptions_remove_prefsrc(struct fib6_info *rt)
 {
 	struct rt6_exception_bucket *bucket;
 	struct rt6_exception *rt6_ex;
@@ -1635,7 +1634,7 @@ static void rt6_exceptions_remove_prefsrc(struct rt6_info *rt)
 	}
 }
 
-static void rt6_exceptions_update_pmtu(struct rt6_info *rt, int mtu)
+static void rt6_exceptions_update_pmtu(struct fib6_info *rt, int mtu)
 {
 	struct rt6_exception_bucket *bucket;
 	struct rt6_exception *rt6_ex;
@@ -1665,7 +1664,7 @@ static void rt6_exceptions_update_pmtu(struct rt6_info *rt, int mtu)
 
 #define RTF_CACHE_GATEWAY	(RTF_GATEWAY | RTF_CACHE)
 
-static void rt6_exceptions_clean_tohost(struct rt6_info *rt,
+static void rt6_exceptions_clean_tohost(struct fib6_info *rt,
 					struct in6_addr *gateway)
 {
 	struct rt6_exception_bucket *bucket;
@@ -1745,7 +1744,7 @@ static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
 	gc_args->more++;
 }
 
-void rt6_age_exceptions(struct rt6_info *rt,
+void rt6_age_exceptions(struct fib6_info *rt,
 			struct fib6_gc_args *gc_args,
 			unsigned long now)
 {
@@ -1779,7 +1778,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 			       const struct sk_buff *skb, int flags)
 {
 	struct fib6_node *fn, *saved_fn;
-	struct rt6_info *f6i;
+	struct fib6_info *f6i;
 	struct rt6_info *rt;
 	int strict = 0;
 
@@ -2106,7 +2105,7 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
  *	Destination cache support functions
  */
 
-static bool fib6_check(struct rt6_info *f6i, u32 cookie)
+static bool fib6_check(struct fib6_info *f6i, u32 cookie)
 {
 	u32 rt_cookie = 0;
 
@@ -2324,7 +2323,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
 {
 	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
 	struct rt6_info *ret = NULL, *rt_cache;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	struct fib6_node *fn;
 
 	/* Get the "current" route for this destination and
@@ -2570,7 +2569,7 @@ static int ip6_dst_gc(struct dst_ops *ops)
 	return entries > rt_max_size;
 }
 
-static int ip6_convert_metrics(struct net *net, struct rt6_info *rt,
+static int ip6_convert_metrics(struct net *net, struct fib6_info *rt,
 			       struct fib6_config *cfg)
 {
 	int err = 0;
@@ -2773,12 +2772,12 @@ static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
 	return err;
 }
 
-static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
+static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
 					      gfp_t gfp_flags,
 					      struct netlink_ext_ack *extack)
 {
 	struct net *net = cfg->fc_nlinfo.nl_net;
-	struct rt6_info *rt = NULL;
+	struct fib6_info *rt = NULL;
 	struct net_device *dev = NULL;
 	struct inet6_dev *idev = NULL;
 	struct fib6_table *table;
@@ -2991,7 +2990,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
 		  struct netlink_ext_ack *extack)
 {
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	int err;
 
 	rt = ip6_route_info_create(cfg, gfp_flags, extack);
@@ -3004,7 +3003,7 @@ int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
 	return err;
 }
 
-static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
+static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
 {
 	struct net *net = info->nl_net;
 	struct fib6_table *table;
@@ -3025,14 +3024,14 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 	return err;
 }
 
-int ip6_del_rt(struct net *net, struct rt6_info *rt)
+int ip6_del_rt(struct net *net, struct fib6_info *rt)
 {
 	struct nl_info info = { .nl_net = net };
 
 	return __ip6_del_rt(rt, &info);
 }
 
-static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
+static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
 {
 	struct nl_info *info = &cfg->fc_nlinfo;
 	struct net *net = info->nl_net;
@@ -3046,7 +3045,7 @@ static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
 	spin_lock_bh(&table->tb6_lock);
 
 	if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
-		struct rt6_info *sibling, *next_sibling;
+		struct fib6_info *sibling, *next_sibling;
 
 		/* prefer to send a single notification with all hops */
 		skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
@@ -3103,8 +3102,9 @@ static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
 static int ip6_route_del(struct fib6_config *cfg,
 			 struct netlink_ext_ack *extack)
 {
-	struct rt6_info *rt, *rt_cache;
+	struct rt6_info *rt_cache;
 	struct fib6_table *table;
+	struct fib6_info *rt;
 	struct fib6_node *fn;
 	int err = -ESRCH;
 
@@ -3280,7 +3280,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 }
 
 #ifdef CONFIG_IPV6_ROUTE_INFO
-static struct rt6_info *rt6_get_route_info(struct net *net,
+static struct fib6_info *rt6_get_route_info(struct net *net,
 					   const struct in6_addr *prefix, int prefixlen,
 					   const struct in6_addr *gwaddr,
 					   struct net_device *dev)
@@ -3288,7 +3288,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
 	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
 	int ifindex = dev->ifindex;
 	struct fib6_node *fn;
-	struct rt6_info *rt = NULL;
+	struct fib6_info *rt = NULL;
 	struct fib6_table *table;
 
 	table = fib6_get_table(net, tb_id);
@@ -3307,7 +3307,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
 			continue;
 		if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
 			continue;
-		ip6_hold_safe(NULL, &rt, false);
+		fib6_info_hold(rt);
 		break;
 	}
 out:
@@ -3315,7 +3315,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
 	return rt;
 }
 
-static struct rt6_info *rt6_add_route_info(struct net *net,
+static struct fib6_info *rt6_add_route_info(struct net *net,
 					   const struct in6_addr *prefix, int prefixlen,
 					   const struct in6_addr *gwaddr,
 					   struct net_device *dev,
@@ -3348,12 +3348,12 @@ static struct rt6_info *rt6_add_route_info(struct net *net,
 }
 #endif
 
-struct rt6_info *rt6_get_dflt_router(struct net *net,
+struct fib6_info *rt6_get_dflt_router(struct net *net,
 				     const struct in6_addr *addr,
 				     struct net_device *dev)
 {
 	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	struct fib6_table *table;
 
 	table = fib6_get_table(net, tb_id);
@@ -3368,12 +3368,12 @@ struct rt6_info *rt6_get_dflt_router(struct net *net,
 			break;
 	}
 	if (rt)
-		ip6_hold_safe(NULL, &rt, false);
+		fib6_info_hold(rt);
 	rcu_read_unlock();
 	return rt;
 }
 
-struct rt6_info *rt6_add_dflt_router(struct net *net,
+struct fib6_info *rt6_add_dflt_router(struct net *net,
 				     const struct in6_addr *gwaddr,
 				     struct net_device *dev,
 				     unsigned int pref)
@@ -3407,7 +3407,7 @@ struct rt6_info *rt6_add_dflt_router(struct net *net,
 static void __rt6_purge_dflt_routers(struct net *net,
 				     struct fib6_table *table)
 {
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 restart:
 	rcu_read_lock();
@@ -3557,14 +3557,14 @@ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff
  *	Allocate a dst for local (unicast / anycast) address.
  */
 
-struct rt6_info *addrconf_dst_alloc(struct net *net,
+struct fib6_info *addrconf_dst_alloc(struct net *net,
 				    struct inet6_dev *idev,
 				    const struct in6_addr *addr,
 				    bool anycast, gfp_t gfp_flags)
 {
 	u32 tb_id;
 	struct net_device *dev = idev->dev;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 
 	rt = fib6_info_alloc(gfp_flags);
 	if (!rt)
@@ -3604,7 +3604,7 @@ struct arg_dev_net_ip {
 	struct in6_addr *addr;
 };
 
-static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
+static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
 {
 	struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
 	struct net *net = ((struct arg_dev_net_ip *)arg)->net;
@@ -3637,7 +3637,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
 #define RTF_RA_ROUTER		(RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
 
 /* Remove routers and update dst entries when gateway turn into host. */
-static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
+static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
 {
 	struct in6_addr *gateway = (struct in6_addr *)arg;
 
@@ -3668,9 +3668,9 @@ struct arg_netdev_event {
 	};
 };
 
-static struct rt6_info *rt6_multipath_first_sibling(const struct rt6_info *rt)
+static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 	struct fib6_node *fn;
 
 	fn = rcu_dereference_protected(rt->rt6i_node,
@@ -3688,7 +3688,7 @@ static struct rt6_info *rt6_multipath_first_sibling(const struct rt6_info *rt)
 	return NULL;
 }
 
-static bool rt6_is_dead(const struct rt6_info *rt)
+static bool rt6_is_dead(const struct fib6_info *rt)
 {
 	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
 	    (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
@@ -3698,9 +3698,9 @@ static bool rt6_is_dead(const struct rt6_info *rt)
 	return false;
 }
 
-static int rt6_multipath_total_weight(const struct rt6_info *rt)
+static int rt6_multipath_total_weight(const struct fib6_info *rt)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 	int total = 0;
 
 	if (!rt6_is_dead(rt))
@@ -3714,7 +3714,7 @@ static int rt6_multipath_total_weight(const struct rt6_info *rt)
 	return total;
 }
 
-static void rt6_upper_bound_set(struct rt6_info *rt, int *weight, int total)
+static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
 {
 	int upper_bound = -1;
 
@@ -3726,9 +3726,9 @@ static void rt6_upper_bound_set(struct rt6_info *rt, int *weight, int total)
 	atomic_set(&rt->fib6_nh.nh_upper_bound, upper_bound);
 }
 
-static void rt6_multipath_upper_bound_set(struct rt6_info *rt, int total)
+static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 	int weight = 0;
 
 	rt6_upper_bound_set(rt, &weight, total);
@@ -3737,9 +3737,9 @@ static void rt6_multipath_upper_bound_set(struct rt6_info *rt, int total)
 		rt6_upper_bound_set(iter, &weight, total);
 }
 
-void rt6_multipath_rebalance(struct rt6_info *rt)
+void rt6_multipath_rebalance(struct fib6_info *rt)
 {
-	struct rt6_info *first;
+	struct fib6_info *first;
 	int total;
 
 	/* In case the entire multipath route was marked for flushing,
@@ -3761,7 +3761,7 @@ void rt6_multipath_rebalance(struct rt6_info *rt)
 	rt6_multipath_upper_bound_set(first, total);
 }
 
-static int fib6_ifup(struct rt6_info *rt, void *p_arg)
+static int fib6_ifup(struct fib6_info *rt, void *p_arg)
 {
 	const struct arg_netdev_event *arg = p_arg;
 	struct net *net = dev_net(arg->dev);
@@ -3790,10 +3790,10 @@ void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
 	fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
 }
 
-static bool rt6_multipath_uses_dev(const struct rt6_info *rt,
+static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
 				   const struct net_device *dev)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 
 	if (rt->fib6_nh.nh_dev == dev)
 		return true;
@@ -3804,19 +3804,19 @@ static bool rt6_multipath_uses_dev(const struct rt6_info *rt,
 	return false;
 }
 
-static void rt6_multipath_flush(struct rt6_info *rt)
+static void rt6_multipath_flush(struct fib6_info *rt)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 
 	rt->should_flush = 1;
 	list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
 		iter->should_flush = 1;
 }
 
-static unsigned int rt6_multipath_dead_count(const struct rt6_info *rt,
+static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
 					     const struct net_device *down_dev)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 	unsigned int dead = 0;
 
 	if (rt->fib6_nh.nh_dev == down_dev ||
@@ -3830,11 +3830,11 @@ static unsigned int rt6_multipath_dead_count(const struct rt6_info *rt,
 	return dead;
 }
 
-static void rt6_multipath_nh_flags_set(struct rt6_info *rt,
+static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
 				       const struct net_device *dev,
 				       unsigned int nh_flags)
 {
-	struct rt6_info *iter;
+	struct fib6_info *iter;
 
 	if (rt->fib6_nh.nh_dev == dev)
 		rt->fib6_nh.nh_flags |= nh_flags;
@@ -3844,7 +3844,7 @@ static void rt6_multipath_nh_flags_set(struct rt6_info *rt,
 }
 
 /* called with write lock held for table with rt */
-static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
+static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
 {
 	const struct arg_netdev_event *arg = p_arg;
 	const struct net_device *dev = arg->dev;
@@ -3911,7 +3911,7 @@ struct rt6_mtu_change_arg {
 	unsigned int mtu;
 };
 
-static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
+static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
 {
 	struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
 	struct inet6_dev *idev;
@@ -4107,7 +4107,7 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
 }
 
 struct rt6_nh {
-	struct rt6_info *rt6_info;
+	struct fib6_info *fib6_info;
 	struct fib6_config r_cfg;
 	struct list_head next;
 };
@@ -4125,21 +4125,22 @@ static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
 
 static int ip6_route_info_append(struct net *net,
 				 struct list_head *rt6_nh_list,
-				 struct rt6_info *rt, struct fib6_config *r_cfg)
+				 struct fib6_info *rt,
+				 struct fib6_config *r_cfg)
 {
 	struct rt6_nh *nh;
 	int err = -EEXIST;
 
 	list_for_each_entry(nh, rt6_nh_list, next) {
-		/* check if rt6_info already exists */
-		if (rt6_duplicate_nexthop(nh->rt6_info, rt))
+		/* check if fib6_info already exists */
+		if (rt6_duplicate_nexthop(nh->fib6_info, rt))
 			return err;
 	}
 
 	nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 	if (!nh)
 		return -ENOMEM;
-	nh->rt6_info = rt;
+	nh->fib6_info = rt;
 	err = ip6_convert_metrics(net, rt, r_cfg);
 	if (err) {
 		kfree(nh);
@@ -4151,8 +4152,8 @@ static int ip6_route_info_append(struct net *net,
 	return 0;
 }
 
-static void ip6_route_mpath_notify(struct rt6_info *rt,
-				   struct rt6_info *rt_last,
+static void ip6_route_mpath_notify(struct fib6_info *rt,
+				   struct fib6_info *rt_last,
 				   struct nl_info *info,
 				   __u16 nlflags)
 {
@@ -4164,7 +4165,7 @@ static void ip6_route_mpath_notify(struct rt6_info *rt,
 	 */
 	if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
 		rt = list_first_entry(&rt_last->rt6i_siblings,
-				      struct rt6_info,
+				      struct fib6_info,
 				      rt6i_siblings);
 	}
 
@@ -4175,11 +4176,11 @@ static void ip6_route_mpath_notify(struct rt6_info *rt,
 static int ip6_route_multipath_add(struct fib6_config *cfg,
 				   struct netlink_ext_ack *extack)
 {
-	struct rt6_info *rt_notif = NULL, *rt_last = NULL;
+	struct fib6_info *rt_notif = NULL, *rt_last = NULL;
 	struct nl_info *info = &cfg->fc_nlinfo;
 	struct fib6_config r_cfg;
 	struct rtnexthop *rtnh;
-	struct rt6_info *rt;
+	struct fib6_info *rt;
 	struct rt6_nh *err_nh;
 	struct rt6_nh *nh, *nh_safe;
 	__u16 nlflags;
@@ -4199,7 +4200,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 	rtnh = (struct rtnexthop *)cfg->fc_mp;
 
 	/* Parse a Multipath Entry and build a list (rt6_nh_list) of
-	 * rt6_info structs per nexthop
+	 * fib6_info structs per nexthop
 	 */
 	while (rtnh_ok(rtnh, remaining)) {
 		memcpy(&r_cfg, cfg, sizeof(*cfg));
@@ -4248,16 +4249,16 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 
 	err_nh = NULL;
 	list_for_each_entry(nh, &rt6_nh_list, next) {
-		rt_last = nh->rt6_info;
-		err = __ip6_ins_rt(nh->rt6_info, info, extack);
-		fib6_info_release(nh->rt6_info);
+		rt_last = nh->fib6_info;
+		err = __ip6_ins_rt(nh->fib6_info, info, extack);
+		fib6_info_release(nh->fib6_info);
 
 		/* save reference to first route for notification */
 		if (!rt_notif && !err)
-			rt_notif = nh->rt6_info;
+			rt_notif = nh->fib6_info;
 
-		/* nh->rt6_info is used or freed at this point, reset to NULL*/
-		nh->rt6_info = NULL;
+		/* nh->fib6_info is used or freed at this point, reset to NULL*/
+		nh->fib6_info = NULL;
 		if (err) {
 			if (replace && nhn)
 				ip6_print_replace_route_err(&rt6_nh_list);
@@ -4298,8 +4299,8 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
 
 cleanup:
 	list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
-		if (nh->rt6_info)
-			fib6_info_release(nh->rt6_info);
+		if (nh->fib6_info)
+			fib6_info_release(nh->fib6_info);
 		list_del(&nh->next);
 		kfree(nh);
 	}
@@ -4379,7 +4380,7 @@ static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return ip6_route_add(&cfg, GFP_KERNEL, extack);
 }
 
-static size_t rt6_nlmsg_size(struct rt6_info *rt)
+static size_t rt6_nlmsg_size(struct fib6_info *rt)
 {
 	int nexthop_len = 0;
 
@@ -4409,7 +4410,7 @@ static size_t rt6_nlmsg_size(struct rt6_info *rt)
 	       + nexthop_len;
 }
 
-static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
+static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
 			    unsigned int *flags, bool skip_oif)
 {
 	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
@@ -4446,7 +4447,7 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
 }
 
 /* add multipath next hop */
-static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
+static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
 {
 	const struct net_device *dev = rt->fib6_nh.nh_dev;
 	struct rtnexthop *rtnh;
@@ -4474,7 +4475,7 @@ static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
 }
 
 static int rt6_fill_node(struct net *net, struct sk_buff *skb,
-			 struct rt6_info *rt, struct dst_entry *dst,
+			 struct fib6_info *rt, struct dst_entry *dst,
 			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
 			 unsigned int flags)
@@ -4562,7 +4563,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 	 * each as a nexthop within RTA_MULTIPATH.
 	 */
 	if (rt->rt6i_nsiblings) {
-		struct rt6_info *sibling, *next_sibling;
+		struct fib6_info *sibling, *next_sibling;
 		struct nlattr *mp;
 
 		mp = nla_nest_start(skb, RTA_MULTIPATH);
@@ -4604,7 +4605,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 	return -EMSGSIZE;
 }
 
-int rt6_dump_route(struct rt6_info *rt, void *p_arg)
+int rt6_dump_route(struct fib6_info *rt, void *p_arg)
 {
 	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
 	struct net *net = arg->net;
@@ -4749,7 +4750,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 	return err;
 }
 
-void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 		     unsigned int nlm_flags)
 {
 	struct sk_buff *skb;
-- 
2.11.0

[PATCH RFC v2 net-next 21/21] net/ipv6: Remove unused code and variables for rt6_info

[David Ahern]

Drop unneeded elements from rt6_info struct and rearrange layout to
something more relevant for the data path.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h   | 60 +++----------------------------------------------
 net/ipv6/ip6_fib.c      | 22 ------------------
 net/ipv6/route.c        | 27 ++--------------------
 net/ipv6/xfrm6_policy.c |  2 --
 4 files changed, 5 insertions(+), 106 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index d41b7bd69fb3..a36116b92100 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -175,58 +175,20 @@ struct fib6_info {
 
 struct rt6_info {
 	struct dst_entry		dst;
-	struct rt6_info __rcu		*rt6_next;
 	struct fib6_info		*from;
 
-	/*
-	 * Tail elements of dst_entry (__refcnt etc.)
-	 * and these elements (rarely used in hot path) are in
-	 * the same cache line.
-	 */
-	struct fib6_table		*rt6i_table;
-	struct fib6_node __rcu		*rt6i_node;
-
+	struct rt6key			rt6i_dst;
+	struct rt6key			rt6i_src;
 	struct in6_addr			rt6i_gateway;
-
-	/* Multipath routes:
-	 * siblings is a list of rt6_info that have the the same metric/weight,
-	 * destination, but not the same gateway. nsiblings is just a cache
-	 * to speed up lookup.
-	 */
-	struct list_head		rt6i_siblings;
-	unsigned int			rt6i_nsiblings;
-
-	atomic_t			rt6i_ref;
-
-	/* These are in a separate cache line. */
-	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;
+	struct inet6_dev		*rt6i_idev;
 	u32				rt6i_flags;
-	struct rt6key			rt6i_src;
 	struct rt6key			rt6i_prefsrc;
 
 	struct list_head		rt6i_uncached;
 	struct uncached_list		*rt6i_uncached_list;
 
-	struct inet6_dev		*rt6i_idev;
-	struct rt6_info * __percpu	*rt6i_pcpu;
-	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
-
-	u32				rt6i_metric;
 	/* more non-fragment space at head required */
 	unsigned short			rt6i_nfheader_len;
-	u8				rt6i_protocol;
-	u8				fib6_type;
-	u8				exception_bucket_flushed:1,
-					should_flush:1,
-					dst_nocount:1,
-					dst_nopolicy:1,
-					dst_host:1,
-					unused:3;
-
-	unsigned long			expires;
-	struct dst_metrics		*fib6_metrics;
-#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
-	struct fib6_nh			fib6_nh;
 };
 
 #define for_each_fib6_node_rt_rcu(fn)					\
@@ -328,8 +290,6 @@ static inline void ip6_rt_put(struct rt6_info *rt)
 	dst_release(&rt->dst);
 }
 
-void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
-
 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
 void fib6_info_destroy(struct fib6_info *f6i);
 
@@ -344,20 +304,6 @@ static inline void fib6_info_release(struct fib6_info *f6i)
 		fib6_info_destroy(f6i);
 }
 
-static inline void rt6_hold(struct rt6_info *rt)
-{
-	atomic_inc(&rt->rt6i_ref);
-}
-
-static inline void rt6_release(struct rt6_info *rt)
-{
-	if (atomic_dec_and_test(&rt->rt6i_ref)) {
-		rt6_free_pcpu(rt);
-		dst_dev_put(&rt->dst);
-		dst_release(&rt->dst);
-	}
-}
-
 enum fib6_walk_state {
 #ifdef CONFIG_IPV6_SUBTREES
 	FWS_S,
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index d07dd75ff8cc..8730459ac23a 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -235,28 +235,6 @@ static void node_free(struct net *net, struct fib6_node *fn)
 	net->ipv6.rt6_stats->fib_nodes--;
 }
 
-void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
-{
-	int cpu;
-
-	if (!non_pcpu_rt->rt6i_pcpu)
-		return;
-
-	for_each_possible_cpu(cpu) {
-		struct rt6_info **ppcpu_rt;
-		struct rt6_info *pcpu_rt;
-
-		ppcpu_rt = per_cpu_ptr(non_pcpu_rt->rt6i_pcpu, cpu);
-		pcpu_rt = *ppcpu_rt;
-		if (pcpu_rt) {
-			dst_dev_put(&pcpu_rt->dst);
-			dst_release(&pcpu_rt->dst);
-			*ppcpu_rt = NULL;
-		}
-	}
-}
-EXPORT_SYMBOL_GPL(rt6_free_pcpu);
-
 static void fib6_free_table(struct fib6_table *table)
 {
 	inetpeer_invalidate_tree(&table->tb6_peers);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f02ff954aa2b..90f5fb09c46b 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -302,10 +302,6 @@ static const struct rt6_info ip6_null_entry_template = {
 		.output		= ip6_pkt_discard_out,
 	},
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
-	.rt6i_protocol  = RTPROT_KERNEL,
-	.rt6i_metric	= ~(u32) 0,
-	.rt6i_ref	= ATOMIC_INIT(1),
-	.fib6_type	= RTN_UNREACHABLE,
 };
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -320,10 +316,6 @@ static const struct rt6_info ip6_prohibit_entry_template = {
 		.output		= ip6_pkt_prohibit_out,
 	},
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
-	.rt6i_protocol  = RTPROT_KERNEL,
-	.rt6i_metric	= ~(u32) 0,
-	.rt6i_ref	= ATOMIC_INIT(1),
-	.fib6_type	= RTN_PROHIBIT,
 };
 
 static const struct rt6_info ip6_blk_hole_entry_template = {
@@ -336,10 +328,6 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
 		.output		= dst_discard_out,
 	},
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
-	.rt6i_protocol  = RTPROT_KERNEL,
-	.rt6i_metric	= ~(u32) 0,
-	.rt6i_ref	= ATOMIC_INIT(1),
-	.fib6_type	= RTN_BLACKHOLE,
 };
 
 #endif
@@ -349,7 +337,6 @@ static void rt6_info_init(struct rt6_info *rt)
 	struct dst_entry *dst = &rt->dst;
 
 	memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
-	INIT_LIST_HEAD(&rt->rt6i_siblings);
 	INIT_LIST_HEAD(&rt->rt6i_uncached);
 }
 
@@ -999,12 +986,10 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
 	rt->rt6i_gateway = ort->fib6_nh.nh_gw;
 	rt->rt6i_flags = ort->rt6i_flags;
 	rt6_set_from(rt, ort);
-	rt->rt6i_metric = ort->rt6i_metric;
 #ifdef CONFIG_IPV6_SUBTREES
 	rt->rt6i_src = ort->rt6i_src;
 #endif
 	rt->rt6i_prefsrc = ort->rt6i_prefsrc;
-	rt->rt6i_table = ort->rt6i_table;
 	rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
 }
 
@@ -1183,7 +1168,6 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
 
 	ip6_rt_copy_init(rt, ort);
 	rt->rt6i_flags |= RTF_CACHE;
-	rt->rt6i_metric = 0;
 	rt->dst.flags |= DST_HOST;
 	rt->rt6i_dst.addr = *daddr;
 	rt->rt6i_dst.plen = 128;
@@ -1216,7 +1200,6 @@ static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
 	if (!pcpu_rt)
 		return NULL;
 	ip6_rt_copy_init(pcpu_rt, rt);
-	pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
 	pcpu_rt->rt6i_flags |= RTF_PCPU;
 	return pcpu_rt;
 }
@@ -1270,9 +1253,8 @@ static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
 		return;
 
 	net = dev_net(rt6_ex->rt6i->dst.dev);
-	rt6_ex->rt6i->rt6i_node = NULL;
 	hlist_del_rcu(&rt6_ex->hlist);
-	ip6_rt_put(rt6_ex->rt6i);
+	dst_release(&rt6_ex->rt6i->dst);
 	kfree_rcu(rt6_ex, rcu);
 	WARN_ON_ONCE(!bucket->depth);
 	bucket->depth--;
@@ -1454,8 +1436,6 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	}
 	rt6_ex->rt6i = nrt;
 	rt6_ex->stamp = jiffies;
-	atomic_inc(&nrt->rt6i_ref);
-	nrt->rt6i_node = ort->rt6i_node;
 	hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
 	bucket->depth++;
 	net->ipv6.rt6_stats->fib_rt_cache++;
@@ -2089,7 +2069,6 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
 		rt->rt6i_idev = in6_dev_get(loopback_dev);
 		rt->rt6i_gateway = ort->rt6i_gateway;
 		rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
-		rt->rt6i_metric = 0;
 
 		memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
 #ifdef CONFIG_IPV6_SUBTREES
@@ -2214,8 +2193,7 @@ static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
 {
 	return !(rt->rt6i_flags & RTF_CACHE) &&
-		(rt->rt6i_flags & RTF_PCPU ||
-		 rcu_access_pointer(rt->rt6i_node));
+		(rt->rt6i_flags & RTF_PCPU || rt->from);
 }
 
 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
@@ -3257,7 +3235,6 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 	if (on_link)
 		nrt->rt6i_flags &= ~RTF_GATEWAY;
 
-	nrt->rt6i_protocol = RTPROT_REDIRECT;
 	nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
 
 	/* No need to remove rt from the exception table if rt is
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 88cd0c90fa81..6c26a0a89be9 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -107,8 +107,6 @@ static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
 	 * it was magically lost, so this code needs audit */
 	xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
 						   RTF_LOCAL);
-	xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
-	xdst->u.rt6.rt6i_node = rt->rt6i_node;
 	xdst->route_cookie = rt6_get_cookie(rt);
 	xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
 	xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
-- 
2.11.0

Re: [PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[David Miller]

From: David Ahern <dsahern@gmail.com>
Date: Sun, 18 Mar 2018 20:36:01 -0700

> RFC v2 changes
> - improved commit messages
> - move common metrics code from dst.c to net/ipv4/metrics.c (comment
>   from DaveM)
> - address comments from Wei Wang and Martin KaFai Lau (let me know if
>   I missed something)
> - fixes detected by kernel test robots
>   + added fib6_metric_set to change metric on a FIB entry which could
>     be pointing to read-only dst_default_metrics
>   + 0day testing found a problem with an intermediate patch; added
>     dst_hold_safe on rt->from. Code is removed 3 patches later
> - allow cacheinfo to handle NULL dst; means only expires is pushed to
>   userspace

Series looks great to me.

Nice work David.

Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

[Ido Schimmel]

On Sun, Mar 18, 2018 at 08:36:20PM -0700, David Ahern wrote:
> @@ -405,18 +383,9 @@ static void ip6_dst_destroy(struct dst_entry *dst)
>  		rt->rt6i_idev = NULL;
>  		in6_dev_put(idev);
>  	}
> -	bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
> -	if (bucket) {
> -		rt->rt6i_exception_bucket = NULL;
> -		kfree(bucket);
> -	}
> -
> -	m = rt->fib6_metrics;
> -	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
> -		kfree(m);

You remove this...

>  
>  	rt->from = NULL;
> -	dst_release(&from->dst);
> +	fib6_info_release(from);

Yet fib6_info_release() doesn't take care of it (unlike the IPv4
equivalent), which means you're leaking the metrics.

>  }

Re: [PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[Ido Schimmel]

On Sun, Mar 18, 2018 at 08:36:01PM -0700, David Ahern wrote:
> This set is the first of many changes to improve the scalability of the
> IPv6 code. Follow on changes include:
> - consolidating duplicate fib6_info references like IPv4 does with
>   duplicate fib_info

Before that you need to further break fib6_info into fib6_info and
fib6_alias, or I misunderstood you?

Re: [PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[David Ahern]

On 3/24/18 9:05 AM, Ido Schimmel wrote:
> On Sun, Mar 18, 2018 at 08:36:01PM -0700, David Ahern wrote:
>> This set is the first of many changes to improve the scalability of the
>> IPv6 code. Follow on changes include:
>> - consolidating duplicate fib6_info references like IPv4 does with
>>   duplicate fib_info
> 
> Before that you need to further break fib6_info into fib6_info and
> fib6_alias, or I misunderstood you?
> 

I was only listing the high level intent - to consolidate duplication. I
have not looked into that step yet, but I suspect that split can be done
in the same patch set as consolidating duplicate fib6_info.

As you know, my preference is to move to nexthop objects (makes fib6_nh
optional). I have IPv4 done; IPv6 requires this patch set. To get there
the patch sequence is:
1. separate data structures for fib and dst paths (this set),

2. cleanup set on top of this one (separate set only because this one is
at 21 patches), and

3. nexthop API.

Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

[David Ahern]

On 3/24/18 8:31 AM, Ido Schimmel wrote:
> On Sun, Mar 18, 2018 at 08:36:20PM -0700, David Ahern wrote:
>> @@ -405,18 +383,9 @@ static void ip6_dst_destroy(struct dst_entry *dst)
>>  		rt->rt6i_idev = NULL;
>>  		in6_dev_put(idev);
>>  	}
>> -	bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
>> -	if (bucket) {
>> -		rt->rt6i_exception_bucket = NULL;
>> -		kfree(bucket);
>> -	}
>> -
>> -	m = rt->fib6_metrics;
>> -	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
>> -		kfree(m);
> 
> You remove this...
> 
>>  
>>  	rt->from = NULL;
>> -	dst_release(&from->dst);
>> +	fib6_info_release(from);
> 
> Yet fib6_info_release() doesn't take care of it (unlike the IPv4
> equivalent), which means you're leaking the metrics.
> 
>>  }

ok, I'll take a look. I thought I verified both paths (fib6_info and
dst) were freeing the metrics.

Re: [PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[Ido Schimmel]

On Sat, Mar 24, 2018 at 09:28:01AM -0600, David Ahern wrote:
> On 3/24/18 9:05 AM, Ido Schimmel wrote:
> > On Sun, Mar 18, 2018 at 08:36:01PM -0700, David Ahern wrote:
> >> This set is the first of many changes to improve the scalability of the
> >> IPv6 code. Follow on changes include:
> >> - consolidating duplicate fib6_info references like IPv4 does with
> >>   duplicate fib_info
> > 
> > Before that you need to further break fib6_info into fib6_info and
> > fib6_alias, or I misunderstood you?
> > 
> 
> I was only listing the high level intent - to consolidate duplication. I
> have not looked into that step yet, but I suspect that split can be done
> in the same patch set as consolidating duplicate fib6_info.

I don't think you can perform consolidation of fib6_info as long as it
describes both the route and the nexthop info.

> As you know, my preference is to move to nexthop objects (makes fib6_nh
> optional). I have IPv4 done; IPv6 requires this patch set. 

After going over your presentation [1] I was under the impression that
the fib6_info will be optional, not fib6_nh: "Idea is similar to adding
id to fib_info that is exposed to userspace. Subsequent routes pass id
to avoid fib_info overhead".

But I think misunderstood you. You want to introduce the nexthop API
that will allow you to have multiple fib6_info pointing to the same
fib6_nh?

1. http://vger.kernel.org/netconf2017_files/nexthop-objects.pdf

Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

[Ido Schimmel]

On Sat, Mar 24, 2018 at 09:31:02AM -0600, David Ahern wrote:
> On 3/24/18 8:31 AM, Ido Schimmel wrote:
> > On Sun, Mar 18, 2018 at 08:36:20PM -0700, David Ahern wrote:
> >> @@ -405,18 +383,9 @@ static void ip6_dst_destroy(struct dst_entry *dst)
> >>  		rt->rt6i_idev = NULL;
> >>  		in6_dev_put(idev);
> >>  	}
> >> -	bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
> >> -	if (bucket) {
> >> -		rt->rt6i_exception_bucket = NULL;
> >> -		kfree(bucket);
> >> -	}
> >> -
> >> -	m = rt->fib6_metrics;
> >> -	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
> >> -		kfree(m);
> > 
> > You remove this...
> > 
> >>  
> >>  	rt->from = NULL;
> >> -	dst_release(&from->dst);
> >> +	fib6_info_release(from);
> > 
> > Yet fib6_info_release() doesn't take care of it (unlike the IPv4
> > equivalent), which means you're leaking the metrics.
> > 
> >>  }
> 
> ok, I'll take a look. I thought I verified both paths (fib6_info and
> dst) were freeing the metrics.

I get this from kmemleak (applied your patchset on top of fe2d55d295cf):

unreferenced object 0xffff88004e2c16c8 (size 96):
comm "systemd-network", pid 1255, jiffies 4295166424 (age 957.858s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
backtrace:
ip6_route_info_create (/net/ipv6/route.c:2849) 
ip6_route_add (/net/ipv6/route.c:2975) 
inet6_rtm_newroute (/net/ipv6/route.c:4357) 
rtnetlink_rcv_msg (/net/core/rtnetlink.c:4643) 
netlink_rcv_skb (/net/netlink/af_netlink.c:2445) 
netlink_unicast (/net/netlink/af_netlink.c:1309 /net/netlink/af_netlink.c:1334) 
netlink_sendmsg (/net/netlink/af_netlink.c:1897) 
sock_sendmsg (/net/socket.c:630 /net/socket.c:639) 
SYSC_sendto (/net/socket.c:1748) 
do_syscall_64 (/arch/x86/entry/common.c:287) 
entry_SYSCALL_64_after_hwframe (/arch/x86/entry/entry_64.S:239) 
0xffffffffffffffff (/./include/asm-generic/sections.h:42) 

Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

[David Ahern]

On 3/24/18 10:02 AM, Ido Schimmel wrote:
>>
>> ok, I'll take a look. I thought I verified both paths (fib6_info and
>> dst) were freeing the metrics.
> 
> I get this from kmemleak (applied your patchset on top of fe2d55d295cf):
> 
> unreferenced object 0xffff88004e2c16c8 (size 96):
> comm "systemd-network", pid 1255, jiffies 4295166424 (age 957.858s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> backtrace:
> ip6_route_info_create (/net/ipv6/route.c:2849) 
> ip6_route_add (/net/ipv6/route.c:2975) 
> inet6_rtm_newroute (/net/ipv6/route.c:4357) 
> rtnetlink_rcv_msg (/net/core/rtnetlink.c:4643) 
> netlink_rcv_skb (/net/netlink/af_netlink.c:2445) 
> netlink_unicast (/net/netlink/af_netlink.c:1309 /net/netlink/af_netlink.c:1334) 
> netlink_sendmsg (/net/netlink/af_netlink.c:1897) 
> sock_sendmsg (/net/socket.c:630 /net/socket.c:639) 
> SYSC_sendto (/net/socket.c:1748) 
> do_syscall_64 (/arch/x86/entry/common.c:287) 
> entry_SYSCALL_64_after_hwframe (/arch/x86/entry/entry_64.S:239) 
> 0xffffffffffffffff (/./include/asm-generic/sections.h:42) 
> 

Thanks for confirming. I'll take care of it.

Re: [PATCH RFC v2 net-next 00/21] net/ipv6: Separate data structures for FIB and data path

[David Ahern]

On 3/24/18 9:59 AM, Ido Schimmel wrote:
>> As you know, my preference is to move to nexthop objects (makes fib6_nh
>> optional). I have IPv4 done; IPv6 requires this patch set. 
> 
> After going over your presentation [1] I was under the impression that
> the fib6_info will be optional, not fib6_nh: "Idea is similar to adding
> id to fib_info that is exposed to userspace. Subsequent routes pass id
> to avoid fib_info overhead".

Just using that as an analogy to explain the idea in terms of something
that already exists.

> 
> But I think misunderstood you. You want to introduce the nexthop API
> that will allow you to have multiple fib6_info pointing to the same
> fib6_nh?
> 
> 1. http://vger.kernel.org/netconf2017_files/nexthop-objects.pdf
> 

I see nexthop specs as device, gateway, lwtunnel_state and flags. That's
the basic building block. A nexthop group is multiple nexthops where
each nexthop in the group as its own weight.

The fib_info struct has more than that -- data unrelated to a netxthop
and is really a next level struct.