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* [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support
@ 2020-01-13 15:52 Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 1/8] net: bridge: vlan: add helpers to check for vlan id/range validity Nikolay Aleksandrov
                   ` (7 more replies)
  0 siblings, 8 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Hi,
This patch-set is a prerequisite for adding per-vlan options support
because we need to be able to send vlan-only notifications and do larger
vlan netlink dumps. Per-vlan options are needed as we move the control
more to vlans and would like to add per-vlan state (needed for per-vlan
STP and EVPN), per-vlan multicast options and control, and I'm sure
there would be many more per-vlan options coming.
Now we create/delete/dump vlans with the device AF_SPEC attribute which is
fine since we support vlan ranges or use a compact bridge_vlan_info
structure, but that cannot really be extended to support per-vlan options
well. The biggest issue is dumping them - we tried using the af_spec with
a new vlan option attribute but that led to insufficient message size
quickly, also another minor problem with that is we have to dump all vlans
always when notifying which, with options present, can be huge if they have
different options set, so we decided to add new rtm message types
specifically for vlans and register handlers for them and a new bridge vlan
notification nl group for vlan-only notifications.
The new RTM NEW/DEL/GETVLAN types introduced match the current af spec
bridge functionality and in fact use the same helpers.
The new nl format is:
 [BRIDGE_VLANDB_ENTRY]
    [BRIDGE_VLANDB_ENTRY_INFO] - bridge_vlan_info (either 1 vlan or
                                                   range start)
    [BRIDGE_VLANDB_ENTRY_RANGE] - range end

This allows to encapsulate a range in a single attribute and also to
create vlans and immediately set options on all of them with a single
attribute. The GETVLAN dump can span multiple messages and dump all the
necessary information. The vlan-only notifications are sent on
NEW/DELVLAN events or when vlan options change (currently only flags),
we try hard to compress the vlans into ranges in the notifications as
well. When the per-vlan options are added we'll add helpers to check for
option equality between neighbor vlans and will keep compressing them
when possible.

Note patch 02 is not really required, it's just a nice addition to have
human-readable error messages from the different vlan checks.

iproute2 changes and selftests will be sent with the next set which adds
the first per-vlan option - per-vlan state similar to the port state.

Thank you,
 Nik


Nikolay Aleksandrov (8):
  net: bridge: vlan: add helpers to check for vlan id/range validity
  net: bridge: netlink: add extack error messages when processing vlans
  net: bridge: vlan: add rtm definitions and dump support
  net: bridge: vlan: add new rtm message support
  net: bridge: vlan: add del rtm message support
  net: bridge: vlan: add rtm range support
  net: bridge: vlan: add rtnetlink group and notify support
  net: bridge: vlan: notify on vlan add/delete/change flags

 include/uapi/linux/if_bridge.h |  29 ++
 include/uapi/linux/rtnetlink.h |   9 +
 net/bridge/br_netlink.c        |  61 +++--
 net/bridge/br_private.h        |  90 +++++++
 net/bridge/br_vlan.c           | 473 +++++++++++++++++++++++++++++++--
 security/selinux/nlmsgtab.c    |   5 +-
 6 files changed, 632 insertions(+), 35 deletions(-)

-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 1/8] net: bridge: vlan: add helpers to check for vlan id/range validity
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 2/8] net: bridge: netlink: add extack error messages when processing vlans Nikolay Aleksandrov
                   ` (6 subsequent siblings)
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Add helpers to check if a vlan id or range are valid. The range helper
must be called when range start or end are detected.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 net/bridge/br_netlink.c | 13 +++----------
 net/bridge/br_private.h | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 60136575aea4..14100e8653e6 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -568,17 +568,13 @@ static int br_process_vlan_info(struct net_bridge *br,
 				bool *changed,
 				struct netlink_ext_ack *extack)
 {
-	if (!vinfo_curr->vid || vinfo_curr->vid >= VLAN_VID_MASK)
+	if (!br_vlan_valid_id(vinfo_curr->vid))
 		return -EINVAL;
 
 	if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
-		/* check if we are already processing a range */
-		if (*vinfo_last)
+		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
 			return -EINVAL;
 		*vinfo_last = vinfo_curr;
-		/* don't allow range of pvids */
-		if ((*vinfo_last)->flags & BRIDGE_VLAN_INFO_PVID)
-			return -EINVAL;
 		return 0;
 	}
 
@@ -586,10 +582,7 @@ static int br_process_vlan_info(struct net_bridge *br,
 		struct bridge_vlan_info tmp_vinfo;
 		int v, err;
 
-		if (!(vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END))
-			return -EINVAL;
-
-		if (vinfo_curr->vid <= (*vinfo_last)->vid)
+		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
 			return -EINVAL;
 
 		memcpy(&tmp_vinfo, *vinfo_last,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f540f3bdf294..dbc0089e2c1a 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -507,6 +507,37 @@ static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
 	return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
 }
 
+static inline bool br_vlan_valid_id(u16 vid)
+{
+	return vid > 0 && vid < VLAN_VID_MASK;
+}
+
+static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
+				       const struct bridge_vlan_info *last)
+{
+	/* pvid flag is not allowed in ranges */
+	if (cur->flags & BRIDGE_VLAN_INFO_PVID)
+		return false;
+
+	/* check for required range flags */
+	if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
+			    BRIDGE_VLAN_INFO_RANGE_END)))
+		return false;
+
+	/* when cur is the range end, check if:
+	 *  - it has range start flag
+	 *  - range ids are invalid (end is equal to or before start)
+	 */
+	if (last) {
+		if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
+			return false;
+		else if (cur->vid <= last->vid)
+			return false;
+	}
+
+	return true;
+}
+
 static inline int br_opt_get(const struct net_bridge *br,
 			     enum net_bridge_opts opt)
 {
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 2/8] net: bridge: netlink: add extack error messages when processing vlans
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 1/8] net: bridge: vlan: add helpers to check for vlan id/range validity Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support Nikolay Aleksandrov
                   ` (5 subsequent siblings)
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Add extack messages on vlan processing errors. We need to move the flags
missing check after the "last" check since we may have "last" set but
lack a range end flag in the next entry.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 net/bridge/br_netlink.c |  6 +++---
 net/bridge/br_private.h | 38 +++++++++++++++++++++++++++-----------
 2 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 14100e8653e6..40942cece51a 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -568,11 +568,11 @@ static int br_process_vlan_info(struct net_bridge *br,
 				bool *changed,
 				struct netlink_ext_ack *extack)
 {
-	if (!br_vlan_valid_id(vinfo_curr->vid))
+	if (!br_vlan_valid_id(vinfo_curr->vid, extack))
 		return -EINVAL;
 
 	if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
-		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
+		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
 			return -EINVAL;
 		*vinfo_last = vinfo_curr;
 		return 0;
@@ -582,7 +582,7 @@ static int br_process_vlan_info(struct net_bridge *br,
 		struct bridge_vlan_info tmp_vinfo;
 		int v, err;
 
-		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
+		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
 			return -EINVAL;
 
 		memcpy(&tmp_vinfo, *vinfo_last,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index dbc0089e2c1a..a7dddc5d7790 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -507,32 +507,48 @@ static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
 	return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
 }
 
-static inline bool br_vlan_valid_id(u16 vid)
+static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
 {
-	return vid > 0 && vid < VLAN_VID_MASK;
+	bool ret = vid > 0 && vid < VLAN_VID_MASK;
+
+	if (!ret)
+		NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
+
+	return ret;
 }
 
 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
-				       const struct bridge_vlan_info *last)
+				       const struct bridge_vlan_info *last,
+				       struct netlink_ext_ack *extack)
 {
 	/* pvid flag is not allowed in ranges */
-	if (cur->flags & BRIDGE_VLAN_INFO_PVID)
-		return false;
-
-	/* check for required range flags */
-	if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
-			    BRIDGE_VLAN_INFO_RANGE_END)))
+	if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
+		NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
 		return false;
+	}
 
 	/* when cur is the range end, check if:
 	 *  - it has range start flag
 	 *  - range ids are invalid (end is equal to or before start)
 	 */
 	if (last) {
-		if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
+		if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
+			NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
 			return false;
-		else if (cur->vid <= last->vid)
+		} else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
+			NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
 			return false;
+		} else if (cur->vid <= last->vid) {
+			NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
+			return false;
+		}
+	}
+
+	/* check for required range flags */
+	if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
+			    BRIDGE_VLAN_INFO_RANGE_END))) {
+		NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
+		return false;
 	}
 
 	return true;
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 1/8] net: bridge: vlan: add helpers to check for vlan id/range validity Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 2/8] net: bridge: netlink: add extack error messages when processing vlans Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-14 13:55   ` Jakub Kicinski
  2020-01-13 15:52 ` [PATCH net-next 4/8] net: bridge: vlan: add new rtm message support Nikolay Aleksandrov
                   ` (4 subsequent siblings)
  7 siblings, 1 reply; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

This patch adds vlan rtm definitions:
 - NEWVLAN: to be used for creating vlans, setting options and
   notifications
 - DELVLAN: to be used for deleting vlans
 - GETVLAN: used for dumping vlan information

Dumping vlans which can span multiple messages is added now with basic
information (vid and flags).

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 include/uapi/linux/if_bridge.h |  28 +++++++
 include/uapi/linux/rtnetlink.h |   7 ++
 net/bridge/br_netlink.c        |   2 +
 net/bridge/br_private.h        |  14 ++++
 net/bridge/br_vlan.c           | 149 +++++++++++++++++++++++++++++++++
 security/selinux/nlmsgtab.c    |   5 +-
 6 files changed, 204 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 4a58e3d7de46..4da04f77d9ee 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -165,6 +165,34 @@ struct bridge_stp_xstats {
 	__u64 tx_tcn;
 };
 
+/* Bridge vlan RTM header */
+struct br_vlan_msg {
+	__u8 family;
+	__u8 reserved1;
+	__u16 reserved2;
+	__u32 ifindex;
+};
+
+/* Bridge vlan RTM attributes
+ * [BRIDGE_VLANDB_ENTRY] = {
+ *     [BRIDGE_VLANDB_ENTRY_INFO]
+ *     ...
+ * }
+ */
+enum {
+	BRIDGE_VLANDB_UNSPEC,
+	BRIDGE_VLANDB_ENTRY,
+	__BRIDGE_VLANDB_MAX,
+};
+#define BRIDGE_VLANDB_MAX (__BRIDGE_VLANDB_MAX - 1)
+
+enum {
+	BRIDGE_VLANDB_ENTRY_UNSPEC,
+	BRIDGE_VLANDB_ENTRY_INFO,
+	__BRIDGE_VLANDB_ENTRY_MAX,
+};
+#define BRIDGE_VLANDB_ENTRY_MAX (__BRIDGE_VLANDB_ENTRY_MAX - 1)
+
 /* Bridge multicast database attributes
  * [MDBA_MDB] = {
  *     [MDBA_MDB_ENTRY] = {
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 1418a8362bb7..e06e3e09a1b4 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -171,6 +171,13 @@ enum {
 	RTM_GETLINKPROP,
 #define RTM_GETLINKPROP	RTM_GETLINKPROP
 
+	RTM_NEWVLAN = 112,
+#define RTM_NEWNVLAN	RTM_NEWVLAN
+	RTM_DELVLAN,
+#define RTM_DELVLAN	RTM_DELVLAN
+	RTM_GETVLAN,
+#define RTM_GETVLAN	RTM_GETVLAN
+
 	__RTM_MAX,
 #define RTM_MAX		(((__RTM_MAX + 3) & ~3) - 1)
 };
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 40942cece51a..75a7ecf95d7f 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1657,6 +1657,7 @@ int __init br_netlink_init(void)
 	int err;
 
 	br_mdb_init();
+	br_vlan_rtnl_init();
 	rtnl_af_register(&br_af_ops);
 
 	err = rtnl_link_register(&br_link_ops);
@@ -1674,6 +1675,7 @@ int __init br_netlink_init(void)
 void br_netlink_fini(void)
 {
 	br_mdb_uninit();
+	br_vlan_rtnl_uninit();
 	rtnl_af_unregister(&br_af_ops);
 	rtnl_link_unregister(&br_link_ops);
 }
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index a7dddc5d7790..1c00411ae938 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -958,6 +958,8 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 			 void *ptr);
+void br_vlan_rtnl_init(void);
+void br_vlan_rtnl_uninit(void);
 
 static inline struct net_bridge_vlan_group *br_vlan_group(
 					const struct net_bridge *br)
@@ -1009,6 +1011,10 @@ static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 	return vg->pvid;
 }
 
+static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
+{
+	return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
+}
 #else
 static inline bool br_allowed_ingress(const struct net_bridge *br,
 				      struct net_bridge_vlan_group *vg,
@@ -1152,6 +1158,14 @@ static inline int br_vlan_bridge_event(struct net_device *dev,
 {
 	return 0;
 }
+
+static inline void br_vlan_rtnl_init(void)
+{
+}
+
+static inline void br_vlan_rtnl_uninit(void)
+{
+}
 #endif
 
 struct nf_br_ops {
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index bb98984cd27d..0135a67f50a7 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1505,3 +1505,152 @@ void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
 		break;
 	}
 }
+
+static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 flags)
+{
+	struct bridge_vlan_info info;
+	struct nlattr *nest;
+
+	nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY);
+	if (!nest)
+		return false;
+
+	memset(&info, 0, sizeof(info));
+	info.vid = vid;
+	if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
+		info.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
+	if (flags & BRIDGE_VLAN_INFO_PVID)
+		info.flags |= BRIDGE_VLAN_INFO_PVID;
+
+	if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
+		goto out_err;
+
+	nla_nest_end(skb, nest);
+
+	return true;
+
+out_err:
+	nla_nest_cancel(skb, nest);
+	return false;
+}
+
+static int br_vlan_dump_dev(const struct net_device *dev,
+			    struct sk_buff *skb,
+			    struct netlink_callback *cb)
+{
+	struct net_bridge_vlan_group *vg;
+	int idx = 0, s_idx = cb->args[1];
+	struct nlmsghdr *nlh = NULL;
+	struct net_bridge_vlan *v;
+	struct net_bridge_port *p;
+	struct br_vlan_msg *bvm;
+	struct net_bridge *br;
+	int err = 0;
+	u16 pvid;
+
+	if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
+		return -EINVAL;
+
+	if (netif_is_bridge_master(dev)) {
+		br = netdev_priv(dev);
+		vg = br_vlan_group_rcu(br);
+		p = NULL;
+	} else {
+		p = br_port_get_rcu(dev);
+		if (WARN_ON(!p))
+			return -EINVAL;
+		vg = nbp_vlan_group_rcu(p);
+		br = p->br;
+	}
+
+	if (!vg)
+		return 0;
+
+	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI);
+	if (!nlh)
+		return -EMSGSIZE;
+	bvm = nlmsg_data(nlh);
+	memset(bvm, 0, sizeof(*bvm));
+	bvm->family = PF_BRIDGE;
+	bvm->ifindex = dev->ifindex;
+	pvid = br_get_pvid(vg);
+
+	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
+		if (!br_vlan_should_use(v))
+			continue;
+		if (idx < s_idx)
+			goto skip;
+		if (!br_vlan_fill_vids(skb, v->vid, br_vlan_flags(v, pvid))) {
+			err = -EMSGSIZE;
+			break;
+		}
+skip:
+		idx++;
+	}
+	if (err)
+		cb->args[1] = idx;
+	else
+		cb->args[1] = 0;
+	nlmsg_end(skb, nlh);
+
+	return err;
+}
+
+static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int idx = 0, err = 0, s_idx = cb->args[0];
+	struct net *net = sock_net(skb->sk);
+	struct br_vlan_msg *bvm;
+	struct net_device *dev;
+
+	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
+		NL_SET_ERR_MSG_MOD(cb->extack, "Invalid header for vlan dump request");
+		return -EINVAL;
+	}
+
+	bvm = nlmsg_data(cb->nlh);
+
+	rcu_read_lock();
+	if (bvm->ifindex) {
+		dev = dev_get_by_index_rcu(net, bvm->ifindex);
+		if (!dev) {
+			err = -ENODEV;
+			goto out_err;
+		}
+		err = br_vlan_dump_dev(dev, skb, cb);
+		if (err && err != -EMSGSIZE)
+			goto out_err;
+	} else {
+		for_each_netdev_rcu(net, dev) {
+			if (idx < s_idx)
+				goto skip;
+
+			err = br_vlan_dump_dev(dev, skb, cb);
+			if (err == -EMSGSIZE)
+				break;
+skip:
+			idx++;
+		}
+	}
+	cb->args[0] = idx;
+	rcu_read_unlock();
+
+	return skb->len;
+
+out_err:
+	rcu_read_unlock();
+
+	return err;
+}
+
+void br_vlan_rtnl_init(void)
+{
+	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
+			     br_vlan_rtm_dump, 0);
+}
+
+void br_vlan_rtnl_uninit(void)
+{
+	rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
+}
diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
index c97fdae8f71b..b69231918686 100644
--- a/security/selinux/nlmsgtab.c
+++ b/security/selinux/nlmsgtab.c
@@ -85,6 +85,9 @@ static const struct nlmsg_perm nlmsg_route_perms[] =
 	{ RTM_GETNEXTHOP,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
 	{ RTM_NEWLINKPROP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
 	{ RTM_DELLINKPROP,	NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+	{ RTM_NEWVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+	{ RTM_DELVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+	{ RTM_GETVLAN,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
 };
 
 static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
@@ -168,7 +171,7 @@ int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
 		 * structures at the top of this file with the new mappings
 		 * before updating the BUILD_BUG_ON() macro!
 		 */
-		BUILD_BUG_ON(RTM_MAX != (RTM_NEWLINKPROP + 3));
+		BUILD_BUG_ON(RTM_MAX != (RTM_NEWVLAN + 3));
 		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
 				 sizeof(nlmsg_route_perms));
 		break;
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 4/8] net: bridge: vlan: add new rtm message support
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
                   ` (2 preceding siblings ...)
  2020-01-13 15:52 ` [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 5/8] net: bridge: vlan: add del " Nikolay Aleksandrov
                   ` (3 subsequent siblings)
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Add initial RTM_NEWVLAN support which can only create vlans, operating
similar to the current br_afspec(). We will use it later to also change
per-vlan options. Old-style (flag-based) vlan ranges are not allowed
when using RTM messages, we will introduce vlan ranges later via a new
nested attribute which would allow us to have all the information about a
range encapsulated into a single nl attribute.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 net/bridge/br_netlink.c |  12 ++---
 net/bridge/br_private.h |   6 +++
 net/bridge/br_vlan.c    | 110 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 75a7ecf95d7f..b3da4f46dc64 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -561,12 +561,12 @@ static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
 	return err;
 }
 
-static int br_process_vlan_info(struct net_bridge *br,
-				struct net_bridge_port *p, int cmd,
-				struct bridge_vlan_info *vinfo_curr,
-				struct bridge_vlan_info **vinfo_last,
-				bool *changed,
-				struct netlink_ext_ack *extack)
+int br_process_vlan_info(struct net_bridge *br,
+			 struct net_bridge_port *p, int cmd,
+			 struct bridge_vlan_info *vinfo_curr,
+			 struct bridge_vlan_info **vinfo_last,
+			 bool *changed,
+			 struct netlink_ext_ack *extack)
 {
 	if (!br_vlan_valid_id(vinfo_curr->vid, extack))
 		return -EINVAL;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1c00411ae938..ee3871dea68f 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1237,6 +1237,12 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 	       u32 filter_mask, int nlflags);
+int br_process_vlan_info(struct net_bridge *br,
+			 struct net_bridge_port *p, int cmd,
+			 struct bridge_vlan_info *vinfo_curr,
+			 struct bridge_vlan_info **vinfo_last,
+			 bool *changed,
+			 struct netlink_ext_ack *extack);
 
 #ifdef CONFIG_SYSFS
 /* br_sysfs_if.c */
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 0135a67f50a7..b8f52a7616c4 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1644,13 +1644,123 @@ static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	return err;
 }
 
+static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
+	[BRIDGE_VLANDB_ENTRY_INFO]	= { .type = NLA_EXACT_LEN,
+					    .len = sizeof(struct bridge_vlan_info) },
+};
+
+static int br_vlan_rtm_process_one(struct net_device *dev,
+				   const struct nlattr *attr,
+				   int cmd, struct netlink_ext_ack *extack)
+{
+	struct bridge_vlan_info *vinfo, *vinfo_last = NULL;
+	struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
+	struct net_bridge_vlan_group *vg;
+	struct net_bridge_port *p = NULL;
+	int err = 0, cmdmap = 0;
+	struct net_bridge *br;
+	bool changed = false;
+
+	if (netif_is_bridge_master(dev)) {
+		br = netdev_priv(dev);
+		vg = br_vlan_group(br);
+	} else {
+		p = br_port_get_rtnl(dev);
+		if (WARN_ON(!p))
+			return -ENODEV;
+		br = p->br;
+		vg = nbp_vlan_group(p);
+	}
+
+	if (WARN_ON(!vg))
+		return -ENODEV;
+
+	err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr,
+			       br_vlan_db_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
+		return -EINVAL;
+	}
+
+	vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
+	if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
+			    BRIDGE_VLAN_INFO_RANGE_END)) {
+		NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls");
+		return -EINVAL;
+	}
+	if (!br_vlan_valid_id(vinfo->vid, extack))
+		return -EINVAL;
+
+	switch (cmd) {
+	case RTM_NEWVLAN:
+		cmdmap = RTM_SETLINK;
+		break;
+	}
+
+	err = br_process_vlan_info(br, p, cmdmap, vinfo, &vinfo_last, &changed,
+				   extack);
+	if (changed)
+		br_ifinfo_notify(cmdmap, br, p);
+
+	return err;
+}
+
+static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh,
+			       struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	int err = -EINVAL, vlans = 0;
+	struct br_vlan_msg *bvm;
+	struct net_device *dev;
+	struct nlattr *attr;
+	int rem;
+
+	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
+		NL_SET_ERR_MSG_MOD(extack, "Invalid header for vlan request");
+		return -EINVAL;
+	}
+
+	bvm = nlmsg_data(nlh);
+	dev = __dev_get_by_index(net, bvm->ifindex);
+	if (!dev)
+		return -ENODEV;
+
+	if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port");
+		return -EINVAL;
+	}
+
+	nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) {
+		if (nla_type(attr) != BRIDGE_VLANDB_ENTRY)
+			continue;
+
+		vlans++;
+		err = br_vlan_rtm_process_one(dev, attr, nlh->nlmsg_type,
+					      extack);
+		if (err)
+			break;
+	}
+	if (!vlans) {
+		NL_SET_ERR_MSG_MOD(extack, "No vlans found to process");
+		err = -EINVAL;
+	}
+
+	return err;
+}
+
 void br_vlan_rtnl_init(void)
 {
 	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
 			     br_vlan_rtm_dump, 0);
+	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
+			     br_vlan_rtm_process, NULL, 0);
 }
 
 void br_vlan_rtnl_uninit(void)
 {
 	rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
+	rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
 }
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 5/8] net: bridge: vlan: add del rtm message support
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
                   ` (3 preceding siblings ...)
  2020-01-13 15:52 ` [PATCH net-next 4/8] net: bridge: vlan: add new rtm message support Nikolay Aleksandrov
@ 2020-01-13 15:52 ` " Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 6/8] net: bridge: vlan: add rtm range support Nikolay Aleksandrov
                   ` (2 subsequent siblings)
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Adding RTM_DELVLAN support similar to RTM_NEWVLAN is simple, just need to
map DELVLAN to DELLINK and register the handler.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 net/bridge/br_vlan.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b8f52a7616c4..bd75cee48ad3 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1698,6 +1698,9 @@ static int br_vlan_rtm_process_one(struct net_device *dev,
 	case RTM_NEWVLAN:
 		cmdmap = RTM_SETLINK;
 		break;
+	case RTM_DELVLAN:
+		cmdmap = RTM_DELLINK;
+		break;
 	}
 
 	err = br_process_vlan_info(br, p, cmdmap, vinfo, &vinfo_last, &changed,
@@ -1757,10 +1760,13 @@ void br_vlan_rtnl_init(void)
 			     br_vlan_rtm_dump, 0);
 	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
 			     br_vlan_rtm_process, NULL, 0);
+	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN,
+			     br_vlan_rtm_process, NULL, 0);
 }
 
 void br_vlan_rtnl_uninit(void)
 {
 	rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
 	rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
+	rtnl_unregister(PF_BRIDGE, RTM_DELVLAN);
 }
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 6/8] net: bridge: vlan: add rtm range support
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
                   ` (4 preceding siblings ...)
  2020-01-13 15:52 ` [PATCH net-next 5/8] net: bridge: vlan: add del " Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 7/8] net: bridge: vlan: add rtnetlink group and notify support Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 8/8] net: bridge: vlan: notify on vlan add/delete/change flags Nikolay Aleksandrov
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Add a new vlandb nl attribute - BRIDGE_VLANDB_ENTRY_RANGE which causes
RTM_NEWVLAN/DELVAN to act on a range. Dumps now automatically compress
similar vlans into ranges. This will be also used when per-vlan options
are introduced and vlans' options match, they will be put into a single
range which is encapsulated in one netlink attribute. We need to run
similar checks as br_process_vlan_info() does because these ranges will
be used for options setting and they'll be able to skip
br_process_vlan_info().

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 include/uapi/linux/if_bridge.h |  1 +
 net/bridge/br_vlan.c           | 86 ++++++++++++++++++++++++++++------
 2 files changed, 73 insertions(+), 14 deletions(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 4da04f77d9ee..ac38f0b674b8 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -189,6 +189,7 @@ enum {
 enum {
 	BRIDGE_VLANDB_ENTRY_UNSPEC,
 	BRIDGE_VLANDB_ENTRY_INFO,
+	BRIDGE_VLANDB_ENTRY_RANGE,
 	__BRIDGE_VLANDB_ENTRY_MAX,
 };
 #define BRIDGE_VLANDB_ENTRY_MAX (__BRIDGE_VLANDB_ENTRY_MAX - 1)
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index bd75cee48ad3..4f911742bf5f 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1506,7 +1506,8 @@ void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
 	}
 }
 
-static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 flags)
+static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
+			      u16 flags)
 {
 	struct bridge_vlan_info info;
 	struct nlattr *nest;
@@ -1525,6 +1526,11 @@ static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 flags)
 	if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
 		goto out_err;
 
+	if (vid_range && vid < vid_range &&
+	    !(flags & BRIDGE_VLAN_INFO_PVID) &&
+	    nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range))
+		goto out_err;
+
 	nla_nest_end(skb, nest);
 
 	return true;
@@ -1534,14 +1540,22 @@ static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 flags)
 	return false;
 }
 
+/* check if v_curr can enter a range ending in range_end */
+static bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
+				    const struct net_bridge_vlan *range_end)
+{
+	return v_curr->vid - range_end->vid == 1 &&
+	       range_end->flags == v_curr->flags;
+}
+
 static int br_vlan_dump_dev(const struct net_device *dev,
 			    struct sk_buff *skb,
 			    struct netlink_callback *cb)
 {
+	struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL;
 	struct net_bridge_vlan_group *vg;
 	int idx = 0, s_idx = cb->args[1];
 	struct nlmsghdr *nlh = NULL;
-	struct net_bridge_vlan *v;
 	struct net_bridge_port *p;
 	struct br_vlan_msg *bvm;
 	struct net_bridge *br;
@@ -1576,22 +1590,49 @@ static int br_vlan_dump_dev(const struct net_device *dev,
 	bvm->ifindex = dev->ifindex;
 	pvid = br_get_pvid(vg);
 
+	/* idx must stay at range's beginning until it is filled in */
 	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
 		if (!br_vlan_should_use(v))
 			continue;
-		if (idx < s_idx)
-			goto skip;
-		if (!br_vlan_fill_vids(skb, v->vid, br_vlan_flags(v, pvid))) {
-			err = -EMSGSIZE;
-			break;
+		if (idx < s_idx) {
+			idx++;
+			continue;
 		}
-skip:
-		idx++;
+
+		if (!range_start) {
+			range_start = v;
+			range_end = v;
+			continue;
+		}
+
+		if (v->vid == pvid || !br_vlan_can_enter_range(v, range_end)) {
+			u16 flags = br_vlan_flags(range_start, pvid);
+
+			if (!br_vlan_fill_vids(skb, range_start->vid,
+					       range_end->vid, flags)) {
+				err = -EMSGSIZE;
+				break;
+			}
+			/* advance number of filled vlans */
+			idx += range_end->vid - range_start->vid + 1;
+
+			range_start = v;
+		}
+		range_end = v;
 	}
-	if (err)
-		cb->args[1] = idx;
-	else
-		cb->args[1] = 0;
+
+	/* err will be 0 and range_start will be set in 3 cases here:
+	 * - first vlan (range_start == range_end)
+	 * - last vlan (range_start == range_end, not in range)
+	 * - last vlan range (range_start != range_end, in range)
+	 */
+	if (!err && range_start &&
+	    !br_vlan_fill_vids(skb, range_start->vid, range_end->vid,
+			       br_vlan_flags(range_start, pvid)))
+		err = -EMSGSIZE;
+
+	cb->args[1] = err ? idx : 0;
+
 	nlmsg_end(skb, nlh);
 
 	return err;
@@ -1647,13 +1688,14 @@ static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
 	[BRIDGE_VLANDB_ENTRY_INFO]	= { .type = NLA_EXACT_LEN,
 					    .len = sizeof(struct bridge_vlan_info) },
+	[BRIDGE_VLANDB_ENTRY_RANGE]	= { .type = NLA_U16 },
 };
 
 static int br_vlan_rtm_process_one(struct net_device *dev,
 				   const struct nlattr *attr,
 				   int cmd, struct netlink_ext_ack *extack)
 {
-	struct bridge_vlan_info *vinfo, *vinfo_last = NULL;
+	struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL;
 	struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
 	struct net_bridge_vlan_group *vg;
 	struct net_bridge_port *p = NULL;
@@ -1684,6 +1726,7 @@ static int br_vlan_rtm_process_one(struct net_device *dev,
 		NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
 		return -EINVAL;
 	}
+	memset(&vrange_end, 0, sizeof(vrange_end));
 
 	vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
 	if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
@@ -1694,6 +1737,21 @@ static int br_vlan_rtm_process_one(struct net_device *dev,
 	if (!br_vlan_valid_id(vinfo->vid, extack))
 		return -EINVAL;
 
+	if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) {
+		vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]);
+		/* validate user-provided flags without RANGE_BEGIN */
+		vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags;
+		vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
+
+		/* vinfo_last is the range start, vinfo the range end */
+		vinfo_last = vinfo;
+		vinfo = &vrange_end;
+
+		if (!br_vlan_valid_id(vinfo->vid, extack) ||
+		    !br_vlan_valid_range(vinfo, vinfo_last, extack))
+			return -EINVAL;
+	}
+
 	switch (cmd) {
 	case RTM_NEWVLAN:
 		cmdmap = RTM_SETLINK;
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 7/8] net: bridge: vlan: add rtnetlink group and notify support
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
                   ` (5 preceding siblings ...)
  2020-01-13 15:52 ` [PATCH net-next 6/8] net: bridge: vlan: add rtm range support Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  2020-01-13 15:52 ` [PATCH net-next 8/8] net: bridge: vlan: notify on vlan add/delete/change flags Nikolay Aleksandrov
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Add a new rtnetlink group for bridge vlan notifications - RTNLGRP_BRVLAN
and add support for sending vlan notifications (both single and ranges).
No functional changes intended, the notification support will be used by
later patches.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 include/uapi/linux/rtnetlink.h |  2 +
 net/bridge/br_private.h        | 11 +++++
 net/bridge/br_vlan.c           | 79 ++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index e06e3e09a1b4..fe9136f87a97 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -728,6 +728,8 @@ enum rtnetlink_groups {
 #define RTNLGRP_IPV6_MROUTE_R	RTNLGRP_IPV6_MROUTE_R
 	RTNLGRP_NEXTHOP,
 #define RTNLGRP_NEXTHOP		RTNLGRP_NEXTHOP
+	RTNLGRP_BRVLAN,
+#define RTNLGRP_BRVLAN		RTNLGRP_BRVLAN
 	__RTNLGRP_MAX
 };
 #define RTNLGRP_MAX	(__RTNLGRP_MAX - 1)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index ee3871dea68f..ba162c8197da 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -960,6 +960,10 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 			 void *ptr);
 void br_vlan_rtnl_init(void);
 void br_vlan_rtnl_uninit(void);
+void br_vlan_notify(const struct net_bridge *br,
+		    const struct net_bridge_port *p,
+		    u16 vid, u16 vid_range,
+		    int cmd);
 
 static inline struct net_bridge_vlan_group *br_vlan_group(
 					const struct net_bridge *br)
@@ -1166,6 +1170,13 @@ static inline void br_vlan_rtnl_init(void)
 static inline void br_vlan_rtnl_uninit(void)
 {
 }
+
+static inline void br_vlan_notify(const struct net_bridge *br,
+				  const struct net_bridge_port *p,
+				  u16 vid, u16 vid_range,
+				  int cmd)
+{
+}
 #endif
 
 struct nf_br_ops {
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 4f911742bf5f..46818362d6b7 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1540,6 +1540,85 @@ static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
 	return false;
 }
 
+static size_t rtnl_vlan_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
+		+ nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
+		+ nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
+		+ nla_total_size(sizeof(struct bridge_vlan_info)); /* BRIDGE_VLANDB_ENTRY_INFO */
+}
+
+void br_vlan_notify(const struct net_bridge *br,
+		    const struct net_bridge_port *p,
+		    u16 vid, u16 vid_range,
+		    int cmd)
+{
+	struct net_bridge_vlan_group *vg;
+	struct net_bridge_vlan *v;
+	struct br_vlan_msg *bvm;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+	struct net *net;
+	u16 flags = 0;
+	int ifindex;
+
+	/* right now notifications are done only with rtnl held */
+	ASSERT_RTNL();
+
+	if (p) {
+		ifindex = p->dev->ifindex;
+		vg = nbp_vlan_group(p);
+		net = dev_net(p->dev);
+	} else {
+		ifindex = br->dev->ifindex;
+		vg = br_vlan_group(br);
+		net = dev_net(br->dev);
+	}
+
+	skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
+	if (!skb)
+		goto out_err;
+
+	err = -EMSGSIZE;
+	nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
+	if (!nlh)
+		goto out_err;
+	bvm = nlmsg_data(nlh);
+	memset(bvm, 0, sizeof(*bvm));
+	bvm->family = AF_BRIDGE;
+	bvm->ifindex = ifindex;
+
+	switch (cmd) {
+	case RTM_NEWVLAN:
+		/* need to find the vlan due to flags/options */
+		v = br_vlan_find(vg, vid);
+		if (!v || !br_vlan_should_use(v))
+			goto out_kfree;
+
+		flags = v->flags;
+		if (br_get_pvid(vg) == v->vid)
+			flags |= BRIDGE_VLAN_INFO_PVID;
+		break;
+	case RTM_DELVLAN:
+		break;
+	default:
+		goto out_kfree;
+	}
+
+	if (!br_vlan_fill_vids(skb, vid, vid_range, flags))
+		goto out_err;
+
+	nlmsg_end(skb, nlh);
+	rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
+	return;
+
+out_err:
+	rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
+out_kfree:
+	kfree_skb(skb);
+}
+
 /* check if v_curr can enter a range ending in range_end */
 static bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
 				    const struct net_bridge_vlan *range_end)
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH net-next 8/8] net: bridge: vlan: notify on vlan add/delete/change flags
  2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
                   ` (6 preceding siblings ...)
  2020-01-13 15:52 ` [PATCH net-next 7/8] net: bridge: vlan: add rtnetlink group and notify support Nikolay Aleksandrov
@ 2020-01-13 15:52 ` Nikolay Aleksandrov
  7 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-13 15:52 UTC (permalink / raw)
  To: netdev; +Cc: roopa, davem, bridge, Nikolay Aleksandrov

Now that we can notify, send a notification on add/del or change of flags.
Notifications are also compressed when possible to reduce their number
and relieve user-space of extra processing, due to that we have to
manually notify after each add/del in order to avoid double
notifications. We try hard to notify only about the vlans which actually
changed, thus a single command can result in multiple notifications
about disjoint ranges if there were vlans which didn't change inside.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
---
 net/bridge/br_netlink.c | 34 ++++++++++++++++++--
 net/bridge/br_private.h | 12 +++++++
 net/bridge/br_vlan.c    | 71 ++++++++++++++++++++++++++++++++---------
 3 files changed, 99 insertions(+), 18 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index b3da4f46dc64..43dab4066f91 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -568,9 +568,14 @@ int br_process_vlan_info(struct net_bridge *br,
 			 bool *changed,
 			 struct netlink_ext_ack *extack)
 {
+	int err, rtm_cmd;
+
 	if (!br_vlan_valid_id(vinfo_curr->vid, extack))
 		return -EINVAL;
 
+	/* needed for vlan-only NEWVLAN/DELVLAN notifications */
+	rtm_cmd = br_afspec_cmd_to_rtm(cmd);
+
 	if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
 			return -EINVAL;
@@ -580,7 +585,7 @@ int br_process_vlan_info(struct net_bridge *br,
 
 	if (*vinfo_last) {
 		struct bridge_vlan_info tmp_vinfo;
-		int v, err;
+		int v, v_change_start = 0;
 
 		if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
 			return -EINVAL;
@@ -588,18 +593,41 @@ int br_process_vlan_info(struct net_bridge *br,
 		memcpy(&tmp_vinfo, *vinfo_last,
 		       sizeof(struct bridge_vlan_info));
 		for (v = (*vinfo_last)->vid; v <= vinfo_curr->vid; v++) {
+			bool curr_change = false;
+
 			tmp_vinfo.vid = v;
-			err = br_vlan_info(br, p, cmd, &tmp_vinfo, changed,
+			err = br_vlan_info(br, p, cmd, &tmp_vinfo, &curr_change,
 					   extack);
 			if (err)
 				break;
+			if (curr_change) {
+				*changed = curr_change;
+				if (!v_change_start)
+					v_change_start = v;
+			} else {
+				/* nothing to notify yet */
+				if (!v_change_start)
+					continue;
+				br_vlan_notify(br, p, v_change_start,
+					       v - 1, rtm_cmd);
+				v_change_start = 0;
+			}
 		}
+		/* v_change_start is set only if the last/whole range changed */
+		if (v_change_start)
+			br_vlan_notify(br, p, v_change_start,
+				       v - 1, rtm_cmd);
+
 		*vinfo_last = NULL;
 
 		return err;
 	}
 
-	return br_vlan_info(br, p, cmd, vinfo_curr, changed, extack);
+	err = br_vlan_info(br, p, cmd, vinfo_curr, changed, extack);
+	if (*changed)
+		br_vlan_notify(br, p, vinfo_curr->vid, 0, rtm_cmd);
+
+	return err;
 }
 
 static int br_afspec(struct net_bridge *br,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index ba162c8197da..a6226ff2f0cc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -554,6 +554,18 @@ static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
 	return true;
 }
 
+static inline int br_afspec_cmd_to_rtm(int cmd)
+{
+	switch (cmd) {
+	case RTM_SETLINK:
+		return RTM_NEWVLAN;
+	case RTM_DELLINK:
+		return RTM_DELVLAN;
+	}
+
+	return 0;
+}
+
 static inline int br_opt_get(const struct net_bridge *br,
 			     enum net_bridge_opts opt)
 {
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 46818362d6b7..aa6445d11209 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -257,6 +257,10 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
 					  &changed, extack);
 			if (err)
 				goto out_filt;
+
+			if (changed)
+				br_vlan_notify(br, NULL, v->vid, 0,
+					       RTM_NEWVLAN);
 		}
 
 		masterv = br_vlan_get_master(br, v->vid, extack);
@@ -380,13 +384,31 @@ static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 	kfree(vg);
 }
 
-static void __vlan_flush(struct net_bridge_vlan_group *vg)
+static void __vlan_flush(const struct net_bridge *br,
+			 const struct net_bridge_port *p,
+			 struct net_bridge_vlan_group *vg)
 {
 	struct net_bridge_vlan *vlan, *tmp;
+	u16 v_start = 0, v_end = 0;
 
 	__vlan_delete_pvid(vg, vg->pvid);
-	list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
+	list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) {
+		/* take care of disjoint ranges */
+		if (!v_start) {
+			v_start = vlan->vid;
+		} else if (vlan->vid - v_end != 1) {
+			/* found range end, notify and start next one */
+			br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
+			v_start = vlan->vid;
+		}
+		v_end = vlan->vid;
+
 		__vlan_del(vlan);
+	}
+
+	/* notify about the last/whole vlan range */
+	if (v_start)
+		br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
 }
 
 struct sk_buff *br_handle_vlan(struct net_bridge *br,
@@ -716,7 +738,7 @@ void br_vlan_flush(struct net_bridge *br)
 	ASSERT_RTNL();
 
 	vg = br_vlan_group(br);
-	__vlan_flush(vg);
+	__vlan_flush(br, NULL, vg);
 	RCU_INIT_POINTER(br->vlgrp, NULL);
 	synchronize_rcu();
 	__vlan_group_free(vg);
@@ -925,12 +947,15 @@ static void br_vlan_disable_default_pvid(struct net_bridge *br)
 	/* Disable default_pvid on all ports where it is still
 	 * configured.
 	 */
-	if (vlan_default_pvid(br_vlan_group(br), pvid))
-		br_vlan_delete(br, pvid);
+	if (vlan_default_pvid(br_vlan_group(br), pvid)) {
+		if (!br_vlan_delete(br, pvid))
+			br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
+	}
 
 	list_for_each_entry(p, &br->port_list, list) {
-		if (vlan_default_pvid(nbp_vlan_group(p), pvid))
-			nbp_vlan_delete(p, pvid);
+		if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
+		    !nbp_vlan_delete(p, pvid))
+			br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
 	}
 
 	br->default_pvid = 0;
@@ -972,7 +997,10 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
 				  &vlchange, extack);
 		if (err)
 			goto out;
-		br_vlan_delete(br, old_pvid);
+
+		if (br_vlan_delete(br, old_pvid))
+			br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
+		br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
 		set_bit(0, changed);
 	}
 
@@ -992,7 +1020,9 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
 				   &vlchange, extack);
 		if (err)
 			goto err_port;
-		nbp_vlan_delete(p, old_pvid);
+		if (nbp_vlan_delete(p, old_pvid))
+			br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
+		br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
 		set_bit(p->port_no, changed);
 	}
 
@@ -1007,22 +1037,28 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
 		if (!test_bit(p->port_no, changed))
 			continue;
 
-		if (old_pvid)
+		if (old_pvid) {
 			nbp_vlan_add(p, old_pvid,
 				     BRIDGE_VLAN_INFO_PVID |
 				     BRIDGE_VLAN_INFO_UNTAGGED,
 				     &vlchange, NULL);
+			br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
+		}
 		nbp_vlan_delete(p, pvid);
+		br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
 	}
 
 	if (test_bit(0, changed)) {
-		if (old_pvid)
+		if (old_pvid) {
 			br_vlan_add(br, old_pvid,
 				    BRIDGE_VLAN_INFO_PVID |
 				    BRIDGE_VLAN_INFO_UNTAGGED |
 				    BRIDGE_VLAN_INFO_BRENTRY,
 				    &vlchange, NULL);
+			br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
+		}
 		br_vlan_delete(br, pvid);
+		br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
 	}
 	goto out;
 }
@@ -1115,6 +1151,7 @@ int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
 				   &changed, extack);
 		if (ret)
 			goto err_vlan_add;
+		br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
 	}
 out:
 	return ret;
@@ -1196,7 +1233,7 @@ void nbp_vlan_flush(struct net_bridge_port *port)
 	ASSERT_RTNL();
 
 	vg = nbp_vlan_group(port);
-	__vlan_flush(vg);
+	__vlan_flush(port->br, port, vg);
 	RCU_INIT_POINTER(port->vlgrp, NULL);
 	synchronize_rcu();
 	__vlan_group_free(vg);
@@ -1462,8 +1499,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
 {
 	struct netdev_notifier_changeupper_info *info;
 	struct net_bridge *br = netdev_priv(dev);
-	bool changed;
-	int ret = 0;
+	int vlcmd = 0, ret = 0;
+	bool changed = false;
 
 	switch (event) {
 	case NETDEV_REGISTER:
@@ -1471,9 +1508,11 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
 				  BRIDGE_VLAN_INFO_PVID |
 				  BRIDGE_VLAN_INFO_UNTAGGED |
 				  BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
+		vlcmd = RTM_NEWVLAN;
 		break;
 	case NETDEV_UNREGISTER:
-		br_vlan_delete(br, br->default_pvid);
+		changed = !br_vlan_delete(br, br->default_pvid);
+		vlcmd = RTM_DELVLAN;
 		break;
 	case NETDEV_CHANGEUPPER:
 		info = ptr;
@@ -1487,6 +1526,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
 		br_vlan_link_state_change(dev, br);
 		break;
 	}
+	if (changed)
+		br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
 
 	return ret;
 }
-- 
2.21.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-13 15:52 ` [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support Nikolay Aleksandrov
@ 2020-01-14 13:55   ` Jakub Kicinski
  2020-01-14 15:34     ` David Ahern
  0 siblings, 1 reply; 17+ messages in thread
From: Jakub Kicinski @ 2020-01-14 13:55 UTC (permalink / raw)
  To: Nikolay Aleksandrov; +Cc: netdev, roopa, davem, bridge, dsahern

On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
> +{
> +	int idx = 0, err = 0, s_idx = cb->args[0];
> +	struct net *net = sock_net(skb->sk);
> +	struct br_vlan_msg *bvm;
> +	struct net_device *dev;
> +
> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {

I wonder if it'd be useful to make this a strict != check? At least
when strict validation is on? Perhaps we'll one day want to extend 
the request?

> +		NL_SET_ERR_MSG_MOD(cb->extack, "Invalid header for vlan dump request");
> +		return -EINVAL;
> +	}


^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 13:55   ` Jakub Kicinski
@ 2020-01-14 15:34     ` David Ahern
  2020-01-14 16:36       ` Nikolay Aleksandrov
  0 siblings, 1 reply; 17+ messages in thread
From: David Ahern @ 2020-01-14 15:34 UTC (permalink / raw)
  To: Jakub Kicinski, Nikolay Aleksandrov; +Cc: netdev, roopa, davem, bridge

On 1/14/20 6:55 AM, Jakub Kicinski wrote:
> On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
>> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
>> +{
>> +	int idx = 0, err = 0, s_idx = cb->args[0];
>> +	struct net *net = sock_net(skb->sk);
>> +	struct br_vlan_msg *bvm;
>> +	struct net_device *dev;
>> +
>> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
> 
> I wonder if it'd be useful to make this a strict != check? At least
> when strict validation is on? Perhaps we'll one day want to extend 
> the request?
> 

+1. All new code should be using the strict checks.


^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 15:34     ` David Ahern
@ 2020-01-14 16:36       ` Nikolay Aleksandrov
  2020-01-14 16:45         ` Nikolay Aleksandrov
  0 siblings, 1 reply; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-14 16:36 UTC (permalink / raw)
  To: David Ahern, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 14/01/2020 17:34, David Ahern wrote:
> On 1/14/20 6:55 AM, Jakub Kicinski wrote:
>> On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
>>> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
>>> +{
>>> +	int idx = 0, err = 0, s_idx = cb->args[0];
>>> +	struct net *net = sock_net(skb->sk);
>>> +	struct br_vlan_msg *bvm;
>>> +	struct net_device *dev;
>>> +
>>> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
>>
>> I wonder if it'd be useful to make this a strict != check? At least
>> when strict validation is on? Perhaps we'll one day want to extend 
>> the request?
>>
> 
> +1. All new code should be using the strict checks.
> 

IIRC, I did it to be able to add filter attributes later, but it should just use nlmsg_parse()
instead and all will be taken care of.
I'll respin v2 with that change.

Thanks,
 Nik




^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 16:36       ` Nikolay Aleksandrov
@ 2020-01-14 16:45         ` Nikolay Aleksandrov
  2020-01-14 16:49           ` David Ahern
  0 siblings, 1 reply; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-14 16:45 UTC (permalink / raw)
  To: David Ahern, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 14/01/2020 18:36, Nikolay Aleksandrov wrote:
> On 14/01/2020 17:34, David Ahern wrote:
>> On 1/14/20 6:55 AM, Jakub Kicinski wrote:
>>> On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
>>>> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
>>>> +{
>>>> +	int idx = 0, err = 0, s_idx = cb->args[0];
>>>> +	struct net *net = sock_net(skb->sk);
>>>> +	struct br_vlan_msg *bvm;
>>>> +	struct net_device *dev;
>>>> +
>>>> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
>>>
>>> I wonder if it'd be useful to make this a strict != check? At least
>>> when strict validation is on? Perhaps we'll one day want to extend 
>>> the request?
>>>
>>
>> +1. All new code should be using the strict checks.
>>
> 
> IIRC, I did it to be able to add filter attributes later, but it should just use nlmsg_parse()
> instead and all will be taken care of.
> I'll respin v2 with that change.
> 
> Thanks,
>  Nik
> 

Actually nlmsg_parse() uses the same "<" check for the size before parsing. :)
If I change to it and with no attributes to parse would be essentially equal to the
current situation, but if I make it strict "!=" then we won't be able to add
filter attributes later as we won't be backwards compatible. I'll continue looking
into it, but IMO we should leave it as it is in order to be able to add the filtering later.

Thoughts ?





^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 16:45         ` Nikolay Aleksandrov
@ 2020-01-14 16:49           ` David Ahern
  2020-01-14 16:50             ` Nikolay Aleksandrov
  0 siblings, 1 reply; 17+ messages in thread
From: David Ahern @ 2020-01-14 16:49 UTC (permalink / raw)
  To: Nikolay Aleksandrov, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 1/14/20 9:45 AM, Nikolay Aleksandrov wrote:
> On 14/01/2020 18:36, Nikolay Aleksandrov wrote:
>> On 14/01/2020 17:34, David Ahern wrote:
>>> On 1/14/20 6:55 AM, Jakub Kicinski wrote:
>>>> On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
>>>>> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
>>>>> +{
>>>>> +	int idx = 0, err = 0, s_idx = cb->args[0];
>>>>> +	struct net *net = sock_net(skb->sk);
>>>>> +	struct br_vlan_msg *bvm;
>>>>> +	struct net_device *dev;
>>>>> +
>>>>> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
>>>>
>>>> I wonder if it'd be useful to make this a strict != check? At least
>>>> when strict validation is on? Perhaps we'll one day want to extend 
>>>> the request?
>>>>
>>>
>>> +1. All new code should be using the strict checks.
>>>
>>
>> IIRC, I did it to be able to add filter attributes later, but it should just use nlmsg_parse()
>> instead and all will be taken care of.
>> I'll respin v2 with that change.
>>
>> Thanks,
>>  Nik
>>
> 
> Actually nlmsg_parse() uses the same "<" check for the size before parsing. :)
> If I change to it and with no attributes to parse would be essentially equal to the
> current situation, but if I make it strict "!=" then we won't be able to add
> filter attributes later as we won't be backwards compatible. I'll continue looking
> into it, but IMO we should leave it as it is in order to be able to add the filtering later.
> 
> Thoughts ?
> 
> 
> 
> 

If the header is > sizeof(*bvm) I expect this part of
__nla_validate_parse() to kick in:

        if (unlikely(rem > 0)) {
                pr_warn_ratelimited("netlink: %d bytes leftover after
parsing attributes in process `%s'.\n",
                                    rem, current->comm);
                NL_SET_ERR_MSG(extack, "bytes leftover after parsing
attributes");
                if (validate & NL_VALIDATE_TRAILING)
                        return -EINVAL;
        }


^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 16:49           ` David Ahern
@ 2020-01-14 16:50             ` Nikolay Aleksandrov
  2020-01-14 16:53               ` David Ahern
  0 siblings, 1 reply; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-14 16:50 UTC (permalink / raw)
  To: David Ahern, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 14/01/2020 18:49, David Ahern wrote:
> On 1/14/20 9:45 AM, Nikolay Aleksandrov wrote:
>> On 14/01/2020 18:36, Nikolay Aleksandrov wrote:
>>> On 14/01/2020 17:34, David Ahern wrote:
>>>> On 1/14/20 6:55 AM, Jakub Kicinski wrote:
>>>>> On Mon, 13 Jan 2020 17:52:28 +0200, Nikolay Aleksandrov wrote:
>>>>>> +static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
>>>>>> +{
>>>>>> +	int idx = 0, err = 0, s_idx = cb->args[0];
>>>>>> +	struct net *net = sock_net(skb->sk);
>>>>>> +	struct br_vlan_msg *bvm;
>>>>>> +	struct net_device *dev;
>>>>>> +
>>>>>> +	if (cb->nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bvm))) {
>>>>>
>>>>> I wonder if it'd be useful to make this a strict != check? At least
>>>>> when strict validation is on? Perhaps we'll one day want to extend 
>>>>> the request?
>>>>>
>>>>
>>>> +1. All new code should be using the strict checks.
>>>>
>>>
>>> IIRC, I did it to be able to add filter attributes later, but it should just use nlmsg_parse()
>>> instead and all will be taken care of.
>>> I'll respin v2 with that change.
>>>
>>> Thanks,
>>>  Nik
>>>
>>
>> Actually nlmsg_parse() uses the same "<" check for the size before parsing. :)
>> If I change to it and with no attributes to parse would be essentially equal to the
>> current situation, but if I make it strict "!=" then we won't be able to add
>> filter attributes later as we won't be backwards compatible. I'll continue looking
>> into it, but IMO we should leave it as it is in order to be able to add the filtering later.
>>
>> Thoughts ?
>>
>>
>>
>>
> 
> If the header is > sizeof(*bvm) I expect this part of
> __nla_validate_parse() to kick in:
> 
>         if (unlikely(rem > 0)) {
>                 pr_warn_ratelimited("netlink: %d bytes leftover after
> parsing attributes in process `%s'.\n",
>                                     rem, current->comm);
>                 NL_SET_ERR_MSG(extack, "bytes leftover after parsing
> attributes");
>                 if (validate & NL_VALIDATE_TRAILING)
>                         return -EINVAL;
>         }
> 

Ah fair enough, so nlmsg_parse() would be better even without attrs.


^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 16:50             ` Nikolay Aleksandrov
@ 2020-01-14 16:53               ` David Ahern
  2020-01-14 17:52                 ` Nikolay Aleksandrov
  0 siblings, 1 reply; 17+ messages in thread
From: David Ahern @ 2020-01-14 16:53 UTC (permalink / raw)
  To: Nikolay Aleksandrov, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 1/14/20 9:50 AM, Nikolay Aleksandrov wrote:
> Ah fair enough, so nlmsg_parse() would be better even without attrs.

that was the intention. It would be a good verification of the theory if
you could run a test with a larger ancillary header.

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support
  2020-01-14 16:53               ` David Ahern
@ 2020-01-14 17:52                 ` Nikolay Aleksandrov
  0 siblings, 0 replies; 17+ messages in thread
From: Nikolay Aleksandrov @ 2020-01-14 17:52 UTC (permalink / raw)
  To: David Ahern, Jakub Kicinski; +Cc: netdev, roopa, davem, bridge

On 14/01/2020 18:53, David Ahern wrote:
> On 1/14/20 9:50 AM, Nikolay Aleksandrov wrote:
>> Ah fair enough, so nlmsg_parse() would be better even without attrs.
> 
> that was the intention. It would be a good verification of the theory if
> you could run a test with a larger ancillary header.
> 

Just did, works like expected. Tested all sorts of wrong messages and attributes,
they get properly validated and thrown out.

Sending v2 in a minute. :)

Thanks!



^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, back to index

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-01-13 15:52 [PATCH net-next 0/8] net: bridge: add vlan notifications and rtm support Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 1/8] net: bridge: vlan: add helpers to check for vlan id/range validity Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 2/8] net: bridge: netlink: add extack error messages when processing vlans Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 3/8] net: bridge: vlan: add rtm definitions and dump support Nikolay Aleksandrov
2020-01-14 13:55   ` Jakub Kicinski
2020-01-14 15:34     ` David Ahern
2020-01-14 16:36       ` Nikolay Aleksandrov
2020-01-14 16:45         ` Nikolay Aleksandrov
2020-01-14 16:49           ` David Ahern
2020-01-14 16:50             ` Nikolay Aleksandrov
2020-01-14 16:53               ` David Ahern
2020-01-14 17:52                 ` Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 4/8] net: bridge: vlan: add new rtm message support Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 5/8] net: bridge: vlan: add del " Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 6/8] net: bridge: vlan: add rtm range support Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 7/8] net: bridge: vlan: add rtnetlink group and notify support Nikolay Aleksandrov
2020-01-13 15:52 ` [PATCH net-next 8/8] net: bridge: vlan: notify on vlan add/delete/change flags Nikolay Aleksandrov

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