[PATCH 0/9] Netfilter fixes for net

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

This batch contains Netfilter fixes for net:

1) Restrict hashlimit size to 1048576, from Cong Wang.

2) Check for offload flags from nf_flow_table_offload_setup(),
   this fixes a crash in case the hardware offload is disabled.
   From Florian Westphal.

3) Three preparation patches to extend the conntrack clash resolution,
   from Florian.

4) Extend clash resolution to deal with DNS packets from the same flow
   racing to set up the NAT configuration.

5) Small documentation fix in pipapo, from Stefano Brivio.

6) Remove misleading unlikely() from pipapo_refill(), also from Stefano.

7) Reduce hashlimit mutex scope, from Cong Wang. This patch is actually
   triggering another problem, still under discussion, another patch to
   fix this will follow up.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thank you.

----------------------------------------------------------------

The following changes since commit 259039fa30457986929a324d769f543c1509987f:

  Merge branch 'stmmac-fixes' (2020-02-07 11:36:22 +0100)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 9a7712048f9d43da5022e75eca3d6b81080e76d3:

  netfilter: nft_set_pipapo: Don't abuse unlikely() in pipapo_refill() (2020-02-18 22:07:09 +0100)

----------------------------------------------------------------
Cong Wang (2):
      netfilter: xt_hashlimit: reduce hashlimit_mutex scope for htable_put()
      netfilter: xt_hashlimit: limit the max size of hashtable

Florian Westphal (5):
      netfilter: flowtable: skip offload setup if disabled
      netfilter: conntrack: remove two args from resolve_clash
      netfilter: conntrack: place confirm-bit setting in a helper
      netfilter: conntrack: split resolve_clash function
      netfilter: conntrack: allow insertion of clashing entries

Stefano Brivio (2):
      netfilter: nft_set_pipapo: Fix mapping table example in comments
      netfilter: nft_set_pipapo: Don't abuse unlikely() in pipapo_refill()

 include/linux/rculist_nulls.h                      |   7 +
 include/uapi/linux/netfilter/nf_conntrack_common.h |  12 +-
 net/netfilter/nf_conntrack_core.c                  | 192 ++++++++++++++++++---
 net/netfilter/nf_conntrack_proto_udp.c             |  20 ++-
 net/netfilter/nf_flow_table_offload.c              |   6 +-
 net/netfilter/nft_set_pipapo.c                     |   6 +-
 net/netfilter/xt_hashlimit.c                       |  22 ++-
 7 files changed, 220 insertions(+), 45 deletions(-)

[PATCH 1/9] netfilter: xt_hashlimit: reduce hashlimit_mutex scope for htable_put()

[Pablo Neira Ayuso]

From: Cong Wang <xiyou.wangcong@gmail.com>

It is unnecessary to hold hashlimit_mutex for htable_destroy()
as it is already removed from the global hashtable and its
refcount is already zero.

Also, switch hinfo->use to refcount_t so that we don't have
to hold the mutex until it reaches zero in htable_put().

Reported-and-tested-by: syzbot+adf6c6c2be1c3a718121@syzkaller.appspotmail.com
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/xt_hashlimit.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index bccd47cd7190..cc475a608f81 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -36,6 +36,7 @@
 #include <linux/netfilter_ipv6/ip6_tables.h>
 #include <linux/mutex.h>
 #include <linux/kernel.h>
+#include <linux/refcount.h>
 #include <uapi/linux/netfilter/xt_hashlimit.h>
 
 #define XT_HASHLIMIT_ALL (XT_HASHLIMIT_HASH_DIP | XT_HASHLIMIT_HASH_DPT | \
@@ -114,7 +115,7 @@ struct dsthash_ent {
 
 struct xt_hashlimit_htable {
 	struct hlist_node node;		/* global list of all htables */
-	int use;
+	refcount_t use;
 	u_int8_t family;
 	bool rnd_initialized;
 
@@ -315,7 +316,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
 	for (i = 0; i < hinfo->cfg.size; i++)
 		INIT_HLIST_HEAD(&hinfo->hash[i]);
 
-	hinfo->use = 1;
+	refcount_set(&hinfo->use, 1);
 	hinfo->count = 0;
 	hinfo->family = family;
 	hinfo->rnd_initialized = false;
@@ -420,7 +421,7 @@ static struct xt_hashlimit_htable *htable_find_get(struct net *net,
 	hlist_for_each_entry(hinfo, &hashlimit_net->htables, node) {
 		if (!strcmp(name, hinfo->name) &&
 		    hinfo->family == family) {
-			hinfo->use++;
+			refcount_inc(&hinfo->use);
 			return hinfo;
 		}
 	}
@@ -429,12 +430,11 @@ static struct xt_hashlimit_htable *htable_find_get(struct net *net,
 
 static void htable_put(struct xt_hashlimit_htable *hinfo)
 {
-	mutex_lock(&hashlimit_mutex);
-	if (--hinfo->use == 0) {
+	if (refcount_dec_and_mutex_lock(&hinfo->use, &hashlimit_mutex)) {
 		hlist_del(&hinfo->node);
+		mutex_unlock(&hashlimit_mutex);
 		htable_destroy(hinfo);
 	}
-	mutex_unlock(&hashlimit_mutex);
 }
 
 /* The algorithm used is the Simple Token Bucket Filter (TBF)
-- 
2.11.0

[PATCH 2/9] netfilter: xt_hashlimit: limit the max size of hashtable

[Pablo Neira Ayuso]

From: Cong Wang <xiyou.wangcong@gmail.com>

The user-specified hashtable size is unbound, this could
easily lead to an OOM or a hung task as we hold the global
mutex while allocating and initializing the new hashtable.

Add a max value to cap both cfg->size and cfg->max, as
suggested by Florian.

Reported-and-tested-by: syzbot+adf6c6c2be1c3a718121@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/xt_hashlimit.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index cc475a608f81..7a2c4b8408c4 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -837,6 +837,8 @@ hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
 	return hashlimit_mt_common(skb, par, hinfo, &info->cfg, 3);
 }
 
+#define HASHLIMIT_MAX_SIZE 1048576
+
 static int hashlimit_mt_check_common(const struct xt_mtchk_param *par,
 				     struct xt_hashlimit_htable **hinfo,
 				     struct hashlimit_cfg3 *cfg,
@@ -847,6 +849,14 @@ static int hashlimit_mt_check_common(const struct xt_mtchk_param *par,
 
 	if (cfg->gc_interval == 0 || cfg->expire == 0)
 		return -EINVAL;
+	if (cfg->size > HASHLIMIT_MAX_SIZE) {
+		cfg->size = HASHLIMIT_MAX_SIZE;
+		pr_info_ratelimited("size too large, truncated to %u\n", cfg->size);
+	}
+	if (cfg->max > HASHLIMIT_MAX_SIZE) {
+		cfg->max = HASHLIMIT_MAX_SIZE;
+		pr_info_ratelimited("max too large, truncated to %u\n", cfg->max);
+	}
 	if (par->family == NFPROTO_IPV4) {
 		if (cfg->srcmask > 32 || cfg->dstmask > 32)
 			return -EINVAL;
-- 
2.11.0

[PATCH 3/9] netfilter: flowtable: skip offload setup if disabled

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

nftables test case
tests/shell/testcases/flowtable/0001flowtable_0

results in a crash. After the refactor, if we leave early via
nf_flowtable_hw_offload(), then "struct flow_block_offload" is left
in an uninitialized state, but later users assume its initialised.

Fixes: a7965d58ddab02 ("netfilter: flowtable: add nf_flow_table_offload_cmd()")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_flow_table_offload.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 83e1db37c3b0..06f00cdc3891 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -847,9 +847,6 @@ static int nf_flow_table_offload_cmd(struct flow_block_offload *bo,
 {
 	int err;
 
-	if (!nf_flowtable_hw_offload(flowtable))
-		return 0;
-
 	if (!dev->netdev_ops->ndo_setup_tc)
 		return -EOPNOTSUPP;
 
@@ -876,6 +873,9 @@ int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
 	struct flow_block_offload bo;
 	int err;
 
+	if (!nf_flowtable_hw_offload(flowtable))
+		return 0;
+
 	err = nf_flow_table_offload_cmd(&bo, flowtable, dev, cmd, &extack);
 	if (err < 0)
 		return err;
-- 
2.11.0

[PATCH 4/9] netfilter: conntrack: remove two args from resolve_clash

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

ctinfo is whats taken from the skb, i.e.
ct = nf_ct_get(skb, &ctinfo).

We do not pass 'ct' and instead re-fetch it from the skb.
Just do the same for both netns and ctinfo.

Also add a comment on what clash resolution is supposed to do.
While at it, one indent level can be removed.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_core.c | 69 +++++++++++++++++++++++++++++----------
 1 file changed, 51 insertions(+), 18 deletions(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index d1305423640f..5e332b01f3c0 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -894,31 +894,64 @@ static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 	}
 }
 
-/* Resolve race on insertion if this protocol allows this. */
+/**
+ * nf_ct_resolve_clash - attempt to handle clash without packet drop
+ *
+ * @skb: skb that causes the clash
+ * @h: tuplehash of the clashing entry already in table
+ *
+ * A conntrack entry can be inserted to the connection tracking table
+ * if there is no existing entry with an identical tuple.
+ *
+ * If there is one, @skb (and the assocated, unconfirmed conntrack) has
+ * to be dropped.  In case @skb is retransmitted, next conntrack lookup
+ * will find the already-existing entry.
+ *
+ * The major problem with such packet drop is the extra delay added by
+ * the packet loss -- it will take some time for a retransmit to occur
+ * (or the sender to time out when waiting for a reply).
+ *
+ * This function attempts to handle the situation without packet drop.
+ *
+ * If @skb has no NAT transformation or if the colliding entries are
+ * exactly the same, only the to-be-confirmed conntrack entry is discarded
+ * and @skb is associated with the conntrack entry already in the table.
+ *
+ * Returns NF_DROP if the clash could not be resolved.
+ */
 static __cold noinline int
-nf_ct_resolve_clash(struct net *net, struct sk_buff *skb,
-		    enum ip_conntrack_info ctinfo,
-		    struct nf_conntrack_tuple_hash *h)
+nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h)
 {
 	/* This is the conntrack entry already in hashes that won race. */
 	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
 	const struct nf_conntrack_l4proto *l4proto;
-	enum ip_conntrack_info oldinfo;
-	struct nf_conn *loser_ct = nf_ct_get(skb, &oldinfo);
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *loser_ct;
+	struct net *net;
+
+	loser_ct = nf_ct_get(skb, &ctinfo);
 
 	l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
-	if (l4proto->allow_clash &&
-	    !nf_ct_is_dying(ct) &&
-	    atomic_inc_not_zero(&ct->ct_general.use)) {
-		if (((ct->status & IPS_NAT_DONE_MASK) == 0) ||
-		    nf_ct_match(ct, loser_ct)) {
-			nf_ct_acct_merge(ct, ctinfo, loser_ct);
-			nf_conntrack_put(&loser_ct->ct_general);
-			nf_ct_set(skb, ct, oldinfo);
-			return NF_ACCEPT;
-		}
-		nf_ct_put(ct);
+	if (!l4proto->allow_clash)
+		goto drop;
+
+	if (nf_ct_is_dying(ct))
+		goto drop;
+
+	if (!atomic_inc_not_zero(&ct->ct_general.use))
+		goto drop;
+
+	if (((ct->status & IPS_NAT_DONE_MASK) == 0) ||
+	    nf_ct_match(ct, loser_ct)) {
+		nf_ct_acct_merge(ct, ctinfo, loser_ct);
+		nf_conntrack_put(&loser_ct->ct_general);
+		nf_ct_set(skb, ct, ctinfo);
+		return NF_ACCEPT;
 	}
+
+	nf_ct_put(ct);
+drop:
+	net = nf_ct_net(loser_ct);
 	NF_CT_STAT_INC(net, drop);
 	return NF_DROP;
 }
@@ -1036,7 +1069,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 
 out:
 	nf_ct_add_to_dying_list(ct);
-	ret = nf_ct_resolve_clash(net, skb, ctinfo, h);
+	ret = nf_ct_resolve_clash(skb, h);
 dying:
 	nf_conntrack_double_unlock(hash, reply_hash);
 	NF_CT_STAT_INC(net, insert_failed);
-- 
2.11.0

[PATCH 5/9] netfilter: conntrack: place confirm-bit setting in a helper

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

... so it can be re-used from clash resolution in followup patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_core.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 5e332b01f3c0..5fda5bd10160 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -894,6 +894,19 @@ static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 	}
 }
 
+static void __nf_conntrack_insert_prepare(struct nf_conn *ct)
+{
+	struct nf_conn_tstamp *tstamp;
+
+	atomic_inc(&ct->ct_general.use);
+	ct->status |= IPS_CONFIRMED;
+
+	/* set conntrack timestamp, if enabled. */
+	tstamp = nf_conn_tstamp_find(ct);
+	if (tstamp)
+		tstamp->start = ktime_get_real_ns();
+}
+
 /**
  * nf_ct_resolve_clash - attempt to handle clash without packet drop
  *
@@ -965,7 +978,6 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	struct nf_conntrack_tuple_hash *h;
 	struct nf_conn *ct;
 	struct nf_conn_help *help;
-	struct nf_conn_tstamp *tstamp;
 	struct hlist_nulls_node *n;
 	enum ip_conntrack_info ctinfo;
 	struct net *net;
@@ -1042,13 +1054,8 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	   setting time, otherwise we'd get timer wrap in
 	   weird delay cases. */
 	ct->timeout += nfct_time_stamp;
-	atomic_inc(&ct->ct_general.use);
-	ct->status |= IPS_CONFIRMED;
 
-	/* set conntrack timestamp, if enabled. */
-	tstamp = nf_conn_tstamp_find(ct);
-	if (tstamp)
-		tstamp->start = ktime_get_real_ns();
+	__nf_conntrack_insert_prepare(ct);
 
 	/* Since the lookup is lockless, hash insertion must be done after
 	 * starting the timer and setting the CONFIRMED bit. The RCU barriers
-- 
2.11.0

[PATCH 6/9] netfilter: conntrack: split resolve_clash function

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

Followup patch will need a helper function with the 'clashing entries
refer to the identical tuple in both directions' resolution logic.

This patch will add another resolve_clash helper where loser_ct must
not be added to the dying list because it will be inserted into the
table.

Therefore this also moves the stat counters and dying-list insertion
of the losing ct.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_core.c | 58 +++++++++++++++++++++++++++------------
 1 file changed, 41 insertions(+), 17 deletions(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 5fda5bd10160..3f069eb0f0fc 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -907,6 +907,39 @@ static void __nf_conntrack_insert_prepare(struct nf_conn *ct)
 		tstamp->start = ktime_get_real_ns();
 }
 
+static int __nf_ct_resolve_clash(struct sk_buff *skb,
+				 struct nf_conntrack_tuple_hash *h)
+{
+	/* This is the conntrack entry already in hashes that won race. */
+	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *loser_ct;
+
+	loser_ct = nf_ct_get(skb, &ctinfo);
+
+	if (nf_ct_is_dying(ct))
+		return NF_DROP;
+
+	if (!atomic_inc_not_zero(&ct->ct_general.use))
+		return NF_DROP;
+
+	if (((ct->status & IPS_NAT_DONE_MASK) == 0) ||
+	    nf_ct_match(ct, loser_ct)) {
+		struct net *net = nf_ct_net(ct);
+
+		nf_ct_acct_merge(ct, ctinfo, loser_ct);
+		nf_ct_add_to_dying_list(loser_ct);
+		nf_conntrack_put(&loser_ct->ct_general);
+		nf_ct_set(skb, ct, ctinfo);
+
+		NF_CT_STAT_INC(net, insert_failed);
+		return NF_ACCEPT;
+	}
+
+	nf_ct_put(ct);
+	return NF_DROP;
+}
+
 /**
  * nf_ct_resolve_clash - attempt to handle clash without packet drop
  *
@@ -941,31 +974,23 @@ nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h)
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn *loser_ct;
 	struct net *net;
+	int ret;
 
 	loser_ct = nf_ct_get(skb, &ctinfo);
+	net = nf_ct_net(loser_ct);
 
 	l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
 	if (!l4proto->allow_clash)
 		goto drop;
 
-	if (nf_ct_is_dying(ct))
-		goto drop;
-
-	if (!atomic_inc_not_zero(&ct->ct_general.use))
-		goto drop;
-
-	if (((ct->status & IPS_NAT_DONE_MASK) == 0) ||
-	    nf_ct_match(ct, loser_ct)) {
-		nf_ct_acct_merge(ct, ctinfo, loser_ct);
-		nf_conntrack_put(&loser_ct->ct_general);
-		nf_ct_set(skb, ct, ctinfo);
-		return NF_ACCEPT;
-	}
+	ret = __nf_ct_resolve_clash(skb, h);
+	if (ret == NF_ACCEPT)
+		return ret;
 
-	nf_ct_put(ct);
 drop:
-	net = nf_ct_net(loser_ct);
+	nf_ct_add_to_dying_list(loser_ct);
 	NF_CT_STAT_INC(net, drop);
+	NF_CT_STAT_INC(net, insert_failed);
 	return NF_DROP;
 }
 
@@ -1034,6 +1059,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 
 	if (unlikely(nf_ct_is_dying(ct))) {
 		nf_ct_add_to_dying_list(ct);
+		NF_CT_STAT_INC(net, insert_failed);
 		goto dying;
 	}
 
@@ -1075,11 +1101,9 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	return NF_ACCEPT;
 
 out:
-	nf_ct_add_to_dying_list(ct);
 	ret = nf_ct_resolve_clash(skb, h);
 dying:
 	nf_conntrack_double_unlock(hash, reply_hash);
-	NF_CT_STAT_INC(net, insert_failed);
 	local_bh_enable();
 	return ret;
 }
-- 
2.11.0

[PATCH 7/9] netfilter: conntrack: allow insertion of clashing entries

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

This patch further relaxes the need to drop an skb due to a clash with
an existing conntrack entry.

Current clash resolution handles the case where the clash occurs between
two identical entries (distinct nf_conn objects with same tuples), i.e.:

                    Original                        Reply
existing: 10.2.3.4:42 -> 10.8.8.8:53      10.2.3.4:42 <- 10.0.0.6:5353
clashing: 10.2.3.4:42 -> 10.8.8.8:53      10.2.3.4:42 <- 10.0.0.6:5353

... existing handling will discard the unconfirmed clashing entry and
makes skb->_nfct point to the existing one.  The skb can then be
processed normally just as if the clash would not have existed in the
first place.

For other clashes, the skb needs to be dropped.
This frequently happens with DNS resolvers that send A and AAAA queries
back-to-back when NAT rules are present that cause packets to get
different DNAT transformations applied, for example:

-m statistics --mode random ... -j DNAT --dnat-to 10.0.0.6:5353
-m statistics --mode random ... -j DNAT --dnat-to 10.0.0.7:5353

In this case the A or AAAA query is dropped which incurs a costly
delay during name resolution.

This patch also allows this collision type:
                       Original                   Reply
existing: 10.2.3.4:42 -> 10.8.8.8:53      10.2.3.4:42 <- 10.0.0.6:5353
clashing: 10.2.3.4:42 -> 10.8.8.8:53      10.2.3.4:42 <- 10.0.0.7:5353

In this case, clash is in original direction -- the reply direction
is still unique.

The change makes it so that when the 2nd colliding packet is received,
the clashing conntrack is tagged with new IPS_NAT_CLASH_BIT, gets a fixed
1 second timeout and is inserted in the reply direction only.

The entry is hidden from 'conntrack -L', it will time out quickly
and it can be early dropped because it will never progress to the
ASSURED state.

To avoid special-casing the delete code path to special case
the ORIGINAL hlist_nulls node, a new helper, "hlist_nulls_add_fake", is
added so hlist_nulls_del() will work.

Example:

      CPU A:                               CPU B:
1.  10.2.3.4:42 -> 10.8.8.8:53 (A)
2.                                         10.2.3.4:42 -> 10.8.8.8:53 (AAAA)
3.  Apply DNAT, reply changed to 10.0.0.6
4.                                         10.2.3.4:42 -> 10.8.8.8:53 (AAAA)
5.                                         Apply DNAT, reply changed to 10.0.0.7
6. confirm/commit to conntrack table, no collisions
7.                                         commit clashing entry

Reply comes in:

10.2.3.4:42 <- 10.0.0.6:5353 (A)
 -> Finds a conntrack, DNAT is reversed & packet forwarded to 10.2.3.4:42
10.2.3.4:42 <- 10.0.0.7:5353 (AAAA)
 -> Finds a conntrack, DNAT is reversed & packet forwarded to 10.2.3.4:42
    The conntrack entry is deleted from table, as it has the NAT_CLASH
    bit set.

In case of a retransmit from ORIGINAL dir, all further packets will get
the DNAT transformation to 10.0.0.6.

I tried to come up with other solutions but they all have worse
problems.

Alternatives considered were:
1.  Confirm ct entries at allocation time, not in postrouting.
 a. will cause uneccesarry work when the skb that creates the
    conntrack is dropped by ruleset.
 b. in case nat is applied, ct entry would need to be moved in
    the table, which requires another spinlock pair to be taken.
 c. breaks the 'unconfirmed entry is private to cpu' assumption:
    we would need to guard all nfct->ext allocation requests with
    ct->lock spinlock.

2. Make the unconfirmed list a hash table instead of a pcpu list.
   Shares drawback c) of the first alternative.

3. Document this is expected and force users to rearrange their
   ruleset (e.g. by using "-m cluster" instead of "-m statistics").
   nft has the 'jhash' expression which can be used instead of 'numgen'.

   Major drawback: doesn't fix what I consider a bug, not very realistic
   and I believe its reasonable to have the existing rulesets to 'just
   work'.

4. Document this is expected and force users to steer problematic
   packets to the same CPU -- this would serialize the "allocate new
   conntrack entry/nat table evaluation/perform nat/confirm entry", so
   no race can occur.  Similar drawback to 3.

Another advantage of this patch compared to 1) and 2) is that there are
no changes to the hot path; things are handled in the udp tracker and
the clash resolution path.

Cc: rcu@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/linux/rculist_nulls.h                      |  7 ++
 include/uapi/linux/netfilter/nf_conntrack_common.h | 12 +++-
 net/netfilter/nf_conntrack_core.c                  | 76 +++++++++++++++++++++-
 net/netfilter/nf_conntrack_proto_udp.c             | 20 ++++--
 4 files changed, 108 insertions(+), 7 deletions(-)

diff --git a/include/linux/rculist_nulls.h b/include/linux/rculist_nulls.h
index e5b752027a03..9670b54b484a 100644
--- a/include/linux/rculist_nulls.h
+++ b/include/linux/rculist_nulls.h
@@ -145,6 +145,13 @@ static inline void hlist_nulls_add_tail_rcu(struct hlist_nulls_node *n,
 	}
 }
 
+/* after that hlist_nulls_del will work */
+static inline void hlist_nulls_add_fake(struct hlist_nulls_node *n)
+{
+	n->pprev = &n->next;
+	n->next = (struct hlist_nulls_node *)NULLS_MARKER(NULL);
+}
+
 /**
  * hlist_nulls_for_each_entry_rcu - iterate over rcu list of given type
  * @tpos:	the type * to use as a loop cursor.
diff --git a/include/uapi/linux/netfilter/nf_conntrack_common.h b/include/uapi/linux/netfilter/nf_conntrack_common.h
index 336014bf8868..b6f0bb1dc799 100644
--- a/include/uapi/linux/netfilter/nf_conntrack_common.h
+++ b/include/uapi/linux/netfilter/nf_conntrack_common.h
@@ -97,6 +97,15 @@ enum ip_conntrack_status {
 	IPS_UNTRACKED_BIT = 12,
 	IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
 
+#ifdef __KERNEL__
+	/* Re-purposed for in-kernel use:
+	 * Tags a conntrack entry that clashed with an existing entry
+	 * on insert.
+	 */
+	IPS_NAT_CLASH_BIT = IPS_UNTRACKED_BIT,
+	IPS_NAT_CLASH = IPS_UNTRACKED,
+#endif
+
 	/* Conntrack got a helper explicitly attached via CT target. */
 	IPS_HELPER_BIT = 13,
 	IPS_HELPER = (1 << IPS_HELPER_BIT),
@@ -110,7 +119,8 @@ enum ip_conntrack_status {
 	 */
 	IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
 				 IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
-				 IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_OFFLOAD),
+				 IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_UNTRACKED |
+				 IPS_OFFLOAD),
 
 	__IPS_MAX_BIT = 15,
 };
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 3f069eb0f0fc..1927fc296f95 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -941,10 +941,70 @@ static int __nf_ct_resolve_clash(struct sk_buff *skb,
 }
 
 /**
+ * nf_ct_resolve_clash_harder - attempt to insert clashing conntrack entry
+ *
+ * @skb: skb that causes the collision
+ * @repl_idx: hash slot for reply direction
+ *
+ * Called when origin or reply direction had a clash.
+ * The skb can be handled without packet drop provided the reply direction
+ * is unique or there the existing entry has the identical tuple in both
+ * directions.
+ *
+ * Caller must hold conntrack table locks to prevent concurrent updates.
+ *
+ * Returns NF_DROP if the clash could not be handled.
+ */
+static int nf_ct_resolve_clash_harder(struct sk_buff *skb, u32 repl_idx)
+{
+	struct nf_conn *loser_ct = (struct nf_conn *)skb_nfct(skb);
+	const struct nf_conntrack_zone *zone;
+	struct nf_conntrack_tuple_hash *h;
+	struct hlist_nulls_node *n;
+	struct net *net;
+
+	zone = nf_ct_zone(loser_ct);
+	net = nf_ct_net(loser_ct);
+
+	/* Reply direction must never result in a clash, unless both origin
+	 * and reply tuples are identical.
+	 */
+	hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[repl_idx], hnnode) {
+		if (nf_ct_key_equal(h,
+				    &loser_ct->tuplehash[IP_CT_DIR_REPLY].tuple,
+				    zone, net))
+			return __nf_ct_resolve_clash(skb, h);
+	}
+
+	/* We want the clashing entry to go away real soon: 1 second timeout. */
+	loser_ct->timeout = nfct_time_stamp + HZ;
+
+	/* IPS_NAT_CLASH removes the entry automatically on the first
+	 * reply.  Also prevents UDP tracker from moving the entry to
+	 * ASSURED state, i.e. the entry can always be evicted under
+	 * pressure.
+	 */
+	loser_ct->status |= IPS_FIXED_TIMEOUT | IPS_NAT_CLASH;
+
+	__nf_conntrack_insert_prepare(loser_ct);
+
+	/* fake add for ORIGINAL dir: we want lookups to only find the entry
+	 * already in the table.  This also hides the clashing entry from
+	 * ctnetlink iteration, i.e. conntrack -L won't show them.
+	 */
+	hlist_nulls_add_fake(&loser_ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode);
+
+	hlist_nulls_add_head_rcu(&loser_ct->tuplehash[IP_CT_DIR_REPLY].hnnode,
+				 &nf_conntrack_hash[repl_idx]);
+	return NF_ACCEPT;
+}
+
+/**
  * nf_ct_resolve_clash - attempt to handle clash without packet drop
  *
  * @skb: skb that causes the clash
  * @h: tuplehash of the clashing entry already in table
+ * @hash_reply: hash slot for reply direction
  *
  * A conntrack entry can be inserted to the connection tracking table
  * if there is no existing entry with an identical tuple.
@@ -963,10 +1023,18 @@ static int __nf_ct_resolve_clash(struct sk_buff *skb,
  * exactly the same, only the to-be-confirmed conntrack entry is discarded
  * and @skb is associated with the conntrack entry already in the table.
  *
+ * Failing that, the new, unconfirmed conntrack is still added to the table
+ * provided that the collision only occurs in the ORIGINAL direction.
+ * The new entry will be added after the existing one in the hash list,
+ * so packets in the ORIGINAL direction will continue to match the existing
+ * entry.  The new entry will also have a fixed timeout so it expires --
+ * due to the collision, it will not see bidirectional traffic.
+ *
  * Returns NF_DROP if the clash could not be resolved.
  */
 static __cold noinline int
-nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h)
+nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h,
+		    u32 reply_hash)
 {
 	/* This is the conntrack entry already in hashes that won race. */
 	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
@@ -987,6 +1055,10 @@ nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h)
 	if (ret == NF_ACCEPT)
 		return ret;
 
+	ret = nf_ct_resolve_clash_harder(skb, reply_hash);
+	if (ret == NF_ACCEPT)
+		return ret;
+
 drop:
 	nf_ct_add_to_dying_list(loser_ct);
 	NF_CT_STAT_INC(net, drop);
@@ -1101,7 +1173,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	return NF_ACCEPT;
 
 out:
-	ret = nf_ct_resolve_clash(skb, h);
+	ret = nf_ct_resolve_clash(skb, h, reply_hash);
 dying:
 	nf_conntrack_double_unlock(hash, reply_hash);
 	local_bh_enable();
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 7365b43f8f98..760ca2422816 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -81,6 +81,18 @@ static bool udp_error(struct sk_buff *skb,
 	return false;
 }
 
+static void nf_conntrack_udp_refresh_unreplied(struct nf_conn *ct,
+					       struct sk_buff *skb,
+					       enum ip_conntrack_info ctinfo,
+					       u32 extra_jiffies)
+{
+	if (unlikely(ctinfo == IP_CT_ESTABLISHED_REPLY &&
+		     ct->status & IPS_NAT_CLASH))
+		nf_ct_kill(ct);
+	else
+		nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies);
+}
+
 /* Returns verdict for packet, and may modify conntracktype */
 int nf_conntrack_udp_packet(struct nf_conn *ct,
 			    struct sk_buff *skb,
@@ -116,8 +128,8 @@ int nf_conntrack_udp_packet(struct nf_conn *ct,
 		if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
 			nf_conntrack_event_cache(IPCT_ASSURED, ct);
 	} else {
-		nf_ct_refresh_acct(ct, ctinfo, skb,
-				   timeouts[UDP_CT_UNREPLIED]);
+		nf_conntrack_udp_refresh_unreplied(ct, skb, ctinfo,
+						   timeouts[UDP_CT_UNREPLIED]);
 	}
 	return NF_ACCEPT;
 }
@@ -198,8 +210,8 @@ int nf_conntrack_udplite_packet(struct nf_conn *ct,
 		if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
 			nf_conntrack_event_cache(IPCT_ASSURED, ct);
 	} else {
-		nf_ct_refresh_acct(ct, ctinfo, skb,
-				   timeouts[UDP_CT_UNREPLIED]);
+		nf_conntrack_udp_refresh_unreplied(ct, skb, ctinfo,
+						   timeouts[UDP_CT_UNREPLIED]);
 	}
 	return NF_ACCEPT;
 }
-- 
2.11.0

[PATCH 8/9] netfilter: nft_set_pipapo: Fix mapping table example in comments

[Pablo Neira Ayuso]

From: Stefano Brivio <sbrivio@redhat.com>

In both insertion and lookup examples, the two element pointers
of rule mapping tables were swapped. Fix that.

Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Fixes: 3c4287f62044 ("nf_tables: Add set type for arbitrary concatenation of ranges")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_set_pipapo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c
index f0cb1e13af50..579600b39f39 100644
--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -203,7 +203,7 @@
  * ::
  *
  *       rule indices in last field:    0    1
- *       map to elements:             0x42  0x66
+ *       map to elements:             0x66  0x42
  *
  *
  * Matching
@@ -298,7 +298,7 @@
  * ::
  *
  *       rule indices in last field:    0    1
- *       map to elements:             0x42  0x66
+ *       map to elements:             0x66  0x42
  *
  *      the matching element is at 0x42.
  *
-- 
2.11.0

[PATCH 9/9] netfilter: nft_set_pipapo: Don't abuse unlikely() in pipapo_refill()

[Pablo Neira Ayuso]

From: Stefano Brivio <sbrivio@redhat.com>

I originally used unlikely() in the if (match_only) clause, which
we hit on the mapping table for the last field in a set, to ensure
we avoid branching to the rest of for loop body, which is executed
more frequently.

However, Pablo reports, this is confusing as it gives the impression
that this is not a common case, and it's actually not the intended
usage of unlikely().

I couldn't observe any statistical difference in matching rates on
x864_64 and aarch64 without it, so just drop it.

Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Fixes: 3c4287f62044 ("nf_tables: Add set type for arbitrary concatenation of ranges")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_set_pipapo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c
index 579600b39f39..feac8553f6d9 100644
--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -503,7 +503,7 @@ static int pipapo_refill(unsigned long *map, int len, int rules,
 				return -1;
 			}
 
-			if (unlikely(match_only)) {
+			if (match_only) {
 				bitmap_clear(map, i, 1);
 				return i;
 			}
-- 
2.11.0

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 18 Feb 2020 23:20:52 +0100

> This batch contains Netfilter fixes for net:
> 
> 1) Restrict hashlimit size to 1048576, from Cong Wang.
> 
> 2) Check for offload flags from nf_flow_table_offload_setup(),
>    this fixes a crash in case the hardware offload is disabled.
>    From Florian Westphal.
> 
> 3) Three preparation patches to extend the conntrack clash resolution,
>    from Florian.
> 
> 4) Extend clash resolution to deal with DNS packets from the same flow
>    racing to set up the NAT configuration.
> 
> 5) Small documentation fix in pipapo, from Stefano Brivio.
> 
> 6) Remove misleading unlikely() from pipapo_refill(), also from Stefano.
> 
> 7) Reduce hashlimit mutex scope, from Cong Wang. This patch is actually
>    triggering another problem, still under discussion, another patch to
>    fix this will follow up.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks Pablo.

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu,  9 Jan 2020 00:17:04 +0100

> The following patchset contains Netfilter fixes for net:
> 
> 1) Missing netns context in arp_tables, from Florian Westphal.
> 
> 2) Underflow in flowtable reference counter, from wenxu.
> 
> 3) Fix incorrect ethernet destination address in flowtable offload,
>    from wenxu.
> 
> 4) Check for status of neighbour entry, from wenxu.
> 
> 5) Fix NAT port mangling, from wenxu.
> 
> 6) Unbind callbacks from destroy path to cleanup hardware properly
>    on flowtable removal.
> 
> 7) Fix missing casting statistics timestamp, add nf_flowtable_time_stamp
>    and use it.
> 
> 8) NULL pointer exception when timeout argument is null in conntrack
>    dccp and sctp protocol helpers, from Florian Westphal.
> 
> 9) Possible nul-dereference in ipset with IPSET_ATTR_LINENO, also from
>    Florian.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks Pablo.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following patchset contains Netfilter fixes for net:

1) Missing netns context in arp_tables, from Florian Westphal.

2) Underflow in flowtable reference counter, from wenxu.

3) Fix incorrect ethernet destination address in flowtable offload,
   from wenxu.

4) Check for status of neighbour entry, from wenxu.

5) Fix NAT port mangling, from wenxu.

6) Unbind callbacks from destroy path to cleanup hardware properly
   on flowtable removal.

7) Fix missing casting statistics timestamp, add nf_flowtable_time_stamp
   and use it.

8) NULL pointer exception when timeout argument is null in conntrack
   dccp and sctp protocol helpers, from Florian Westphal.

9) Possible nul-dereference in ipset with IPSET_ATTR_LINENO, also from
   Florian.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit bd6f48546b9cb7a785344fc78058c420923d7ed8:

  net: stmmac: dwmac-meson8b: Fix the RGMII TX delay on Meson8b/8m2 SoCs (2019-12-27 16:37:07 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 22dad713b8a5ff488e07b821195270672f486eb2:

  netfilter: ipset: avoid null deref when IPSET_ATTR_LINENO is present (2020-01-08 23:31:46 +0100)

----------------------------------------------------------------
Florian Westphal (3):
      netfilter: arp_tables: init netns pointer in xt_tgchk_param struct
      netfilter: conntrack: dccp, sctp: handle null timeout argument
      netfilter: ipset: avoid null deref when IPSET_ATTR_LINENO is present

Pablo Neira Ayuso (2):
      netfilter: nf_tables: unbind callbacks from flowtable destroy path
      netfilter: flowtable: add nf_flowtable_time_stamp

wenxu (4):
      netfilter: nft_flow_offload: fix underflow in flowtable reference counter
      netfilter: nf_flow_table_offload: fix incorrect ethernet dst address
      netfilter: nf_flow_table_offload: check the status of dst_neigh
      netfilter: nf_flow_table_offload: fix the nat port mangle.

 include/net/netfilter/nf_flow_table.h   |  6 ++++
 net/ipv4/netfilter/arp_tables.c         | 27 ++++++++++--------
 net/netfilter/ipset/ip_set_core.c       |  3 +-
 net/netfilter/nf_conntrack_proto_dccp.c |  3 ++
 net/netfilter/nf_conntrack_proto_sctp.c |  3 ++
 net/netfilter/nf_flow_table_core.c      |  7 +----
 net/netfilter/nf_flow_table_ip.c        |  4 +--
 net/netfilter/nf_flow_table_offload.c   | 50 ++++++++++++++++++++++++---------
 net/netfilter/nf_tables_api.c           |  8 ++++--
 net/netfilter/nft_flow_offload.c        |  3 --
 10 files changed, 75 insertions(+), 39 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed,  6 Nov 2019 12:12:28 +0100

> The following patchset contains Netfilter fixes for net:
> 
> 1) Missing register size validation in bitwise and cmp offloads.
> 
> 2) Fix error code in ip_set_sockfn_get() when copy_to_user() fails,
>    from Dan Carpenter.
> 
> 3) Oneliner to copy MAC address in IPv6 hash:ip,mac sets, from
>    Stefano Brivio.
> 
> 4) Missing policy validation in ipset with NL_VALIDATE_STRICT,
>    from Jozsef Kadlecsik.
> 
> 5) Fix unaligned access to private data area of nf_tables instructions,
>    from Lukas Wunner.
> 
> 6) Relax check for object updates, reported as a regression by
>    Eric Garver, patch from Fernando Fernandez Mancera.
> 
> 7) Crash on ebtables dnat extension when used from the output path.
>    From Florian Westphal.
> 
> 8) Fix bogus EOPNOTSUPP when updating basechain flags.
> 
> 9) Fix bogus EBUSY when updating a basechain that is already offloaded.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks Pablo.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for net:

1) Missing register size validation in bitwise and cmp offloads.

2) Fix error code in ip_set_sockfn_get() when copy_to_user() fails,
   from Dan Carpenter.

3) Oneliner to copy MAC address in IPv6 hash:ip,mac sets, from
   Stefano Brivio.

4) Missing policy validation in ipset with NL_VALIDATE_STRICT,
   from Jozsef Kadlecsik.

5) Fix unaligned access to private data area of nf_tables instructions,
   from Lukas Wunner.

6) Relax check for object updates, reported as a regression by
   Eric Garver, patch from Fernando Fernandez Mancera.

7) Crash on ebtables dnat extension when used from the output path.
   From Florian Westphal.

8) Fix bogus EOPNOTSUPP when updating basechain flags.

9) Fix bogus EBUSY when updating a basechain that is already offloaded.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 1204c70d9dcba31164f78ad5d8c88c42335d51f8:

  Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net (2019-11-01 17:48:11 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 774e4d34dbebc9dc441535c4712794d336a9478c:

  Merge branch 'master' of git://blackhole.kfki.hu/nf (2019-11-04 20:59:00 +0100)

----------------------------------------------------------------
Dan Carpenter (1):
      netfilter: ipset: Fix an error code in ip_set_sockfn_get()

Fernando Fernandez Mancera (1):
      netfilter: nf_tables: fix unexpected EOPNOTSUPP error

Florian Westphal (1):
      bridge: ebtables: don't crash when using dnat target in output chains

Jozsef Kadlecsik (1):
      netfilter: ipset: Fix nla_policies to fully support NL_VALIDATE_STRICT

Lukas Wunner (1):
      netfilter: nf_tables: Align nft_expr private data to 64-bit

Pablo Neira Ayuso (4):
      netfilter: nf_tables_offload: check for register data length mismatches
      netfilter: nf_tables: bogus EOPNOTSUPP on basechain update
      netfilter: nf_tables_offload: skip EBUSY on chain update
      Merge branch 'master' of git://blackhole.kfki.hu/nf

Stefano Brivio (1):
      netfilter: ipset: Copy the right MAC address in hash:ip,mac IPv6 sets

 include/net/netfilter/nf_tables.h        |  3 +-
 net/bridge/netfilter/ebt_dnat.c          | 19 ++++++++++---
 net/netfilter/ipset/ip_set_core.c        | 49 +++++++++++++++++++++-----------
 net/netfilter/ipset/ip_set_hash_ipmac.c  |  2 +-
 net/netfilter/ipset/ip_set_hash_net.c    |  1 +
 net/netfilter/ipset/ip_set_hash_netnet.c |  1 +
 net/netfilter/nf_tables_api.c            |  7 ++---
 net/netfilter/nf_tables_offload.c        |  3 +-
 net/netfilter/nft_bitwise.c              |  5 ++--
 net/netfilter/nft_cmp.c                  |  2 +-
 10 files changed, 62 insertions(+), 30 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 21 Mar 2019 12:28:36 +0100

> The following patchset contains Netfilter fixes for your net tree:
> 
> 1) Remove a direct dependency with IPv6 introduced by the
>    sip_external_media feature, from Alin Nastac.
> 
> 2) Fix bogus ENOENT when removing interval elements from set.
> 
> 3) Set transport_header from br_netfilter to mimic the stack
>    behaviour, this partially fixes a checksum validation bug
>    from the SCTP connection tracking, from Xin Long.
> 
> 4) Fix undefined reference to symbol in xt_TEE, due to missing
>    Kconfig dependencies, from Arnd Bergmann.
> 
> 5) Check for NULL in skb_header_pointer() calls in ip6t_shr,
>    from Kangjie Lu.
> 
> 6) Fix bogus EBUSY when removing an existing conntrack helper from
>    a transaction.
> 
> 7) Fix module autoload of the redirect extension.
> 
> 8) Remove duplicated transition in flowtable diagram in the existing
>    documentation.
> 
> 9) Missing .release_ops call from error path in newrule() which
>    results module refcount leak, from Taehee Yoo.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for your net tree:

1) Remove a direct dependency with IPv6 introduced by the
   sip_external_media feature, from Alin Nastac.

2) Fix bogus ENOENT when removing interval elements from set.

3) Set transport_header from br_netfilter to mimic the stack
   behaviour, this partially fixes a checksum validation bug
   from the SCTP connection tracking, from Xin Long.

4) Fix undefined reference to symbol in xt_TEE, due to missing
   Kconfig dependencies, from Arnd Bergmann.

5) Check for NULL in skb_header_pointer() calls in ip6t_shr,
   from Kangjie Lu.

6) Fix bogus EBUSY when removing an existing conntrack helper from
   a transaction.

7) Fix module autoload of the redirect extension.

8) Remove duplicated transition in flowtable diagram in the existing
   documentation.

9) Missing .release_ops call from error path in newrule() which
   results module refcount leak, from Taehee Yoo.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit 4ec850e5dfec092b26cf3b7d5a6c9e444ea4babd:

  net: dwmac-sun8i: fix a missing check of of_get_phy_mode (2019-03-12 14:52:00 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to b25a31bf0ca091aa8bdb9ab329b0226257568bbe:

  netfilter: nf_tables: add missing ->release_ops() in error path of newrule() (2019-03-20 08:32:58 +0100)

----------------------------------------------------------------
Alin Nastac (1):
      netfilter: nf_conntrack_sip: remove direct dependency on IPv6

Arnd Bergmann (1):
      netfilter: fix NETFILTER_XT_TARGET_TEE dependencies

Kangjie Lu (1):
      netfilter: ip6t_srh: fix NULL pointer dereferences

Pablo Neira Ayuso (4):
      netfilter: nft_set_rbtree: check for inactive element after flag mismatch
      netfilter: nf_tables: bogus EBUSY in helper removal from transaction
      netfilter: nft_redir: fix module autoload with ip4
      netfilter: nf_flowtable: remove duplicated transition in diagram

Taehee Yoo (1):
      netfilter: nf_tables: add missing ->release_ops() in error path of newrule()

Xin Long (1):
      netfilter: bridge: set skb transport_header before entering NF_INET_PRE_ROUTING

 Documentation/networking/nf_flowtable.txt |  8 +++----
 net/bridge/br_netfilter_hooks.c           |  1 +
 net/bridge/br_netfilter_ipv6.c            |  2 ++
 net/ipv6/netfilter/ip6t_srh.c             |  6 +++++
 net/netfilter/Kconfig                     |  1 +
 net/netfilter/nf_conntrack_sip.c          | 37 +++++++++++++------------------
 net/netfilter/nf_tables_api.c             |  5 ++++-
 net/netfilter/nft_objref.c                | 19 +++++++++++++---
 net/netfilter/nft_redir.c                 |  2 +-
 net/netfilter/nft_set_rbtree.c            |  7 +++---
 10 files changed, 54 insertions(+), 34 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Sat, 29 Dec 2018 13:57:54 +0100

> The following patchset contains Netfilter fixes for net, specifically
> fixes for the nf_conncount infrastructure which is causing troubles
> since 5c789e131cbb9 ("netfilter: nf_conncount: Add list lock and gc
> worker, and RCU for init tree search"). Patches aim to simplify this
> infrastructure while fixing up the problems:
 ...
> And one patch that falls within the miscelanea category in this batch:
> 
> 9) Missing error path for nla_nest_start(), from Kangjie Lu.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thank you.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for net, specifically
fixes for the nf_conncount infrastructure which is causing troubles
since 5c789e131cbb9 ("netfilter: nf_conncount: Add list lock and gc
worker, and RCU for init tree search"). Patches aim to simplify this
infrastructure while fixing up the problems:

1) Use fixed size CONNCOUNT_SLOTS in nf_conncount, from Shawn Bohrer.

2) Incorrect signedness in age calculation from find_or_evict(),
   from Florian Westphal.

3) Proper locking for the garbage collector workqueue callback,
   first make a patch to count how many nodes can be collected
   without holding locks, then grab lock and release them. Also
   from Florian.

4) Restart node lookup from the insertion path, after releasing nodes
   via packet path garbage collection. Shawn Bohrer described a scenario
   that may result in inserting a connection in an already dead list
   node. Patch from Florian.

5) Merge lookup and add function to avoid a hold release and re-grab.
   From Florian.

6) Be safe and iterate over the node lists under the spinlock.

7) Speculative list nodes removal via garbage collection, check if
   list node got a connection while it was scheduled for deletion
   via gc.

8) Accidental argument swap in find_next_bit() that leads to more
   frequent scheduling of the workqueue. From Florian Westphal.

And one patch that falls within the miscelanea category in this batch:

9) Missing error path for nla_nest_start(), from Kangjie Lu.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit a3c9311f62b4943228ae90f769775dd3bcbfa7c0:

  include/linux/phy/phy.h: fix minor kerneldoc errors (2018-12-27 16:31:10 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to a007232066f6839d6f256bab21e825d968f1a163:

  netfilter: nf_conncount: fix argument order to find_next_bit (2018-12-29 02:45:22 +0100)

----------------------------------------------------------------
Florian Westphal (5):
      netfilter: nf_conncount: don't skip eviction when age is negative
      netfilter: nf_conncount: split gc in two phases
      netfilter: nf_conncount: restart search when nodes have been erased
      netfilter: nf_conncount: merge lookup and add functions
      netfilter: nf_conncount: fix argument order to find_next_bit

Kangjie Lu (1):
      netfilter: nf_tables: fix a missing check of nla_put_failure

Pablo Neira Ayuso (2):
      netfilter: nf_conncount: move all list iterations under spinlock
      netfilter: nf_conncount: speculative garbage collection on empty lists

Shawn Bohrer (1):
      netfilter: nf_conncount: replace CONNCOUNT_LOCK_SLOTS with CONNCOUNT_SLOTS

 include/net/netfilter/nf_conntrack_count.h |  19 +-
 net/netfilter/nf_conncount.c               | 290 +++++++++++++----------------
 net/netfilter/nf_tables_api.c              |   2 +
 net/netfilter/nft_connlimit.c              |  14 +-
 4 files changed, 136 insertions(+), 189 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 24 Jul 2018 18:31:24 +0200

> The following patchset contains Netfilter fixes for net:
 ...
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thank you.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for net:

1) Make sure we don't go over the maximum jump stack boundary,
   from Taehee Yoo.

2) Missing rcu_barrier() in hash and rbtree sets, also from Taehee.

3) Missing check to nul-node in rbtree timeout routine, from Taehee.

4) Use dev->name from flowtable to fix a memleak, from Florian.

5) Oneliner to free flowtable object on removal, from Florian.

6) Memleak in chain rename transaction, again from Florian.

7) Don't allow two chains to use the same name in the same
   transaction, from Florian.

8) handle DCCP SYNC/SYNCACK as invalid, this triggers an
   uninitialized timer in conntrack reported by syzbot, from Florian.

9) Fix leak in case netlink_dump_start() fails, from Florian.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 1992d99882afda6dc17f9d49c06150856a91282f:

  net/smc: take sock lock in smc_ioctl() (2018-07-16 14:45:13 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 90fd131afc565159c9e0ea742f082b337e10f8c6:

  netfilter: nf_tables: move dumper state allocation into ->start (2018-07-24 00:36:33 +0200)

----------------------------------------------------------------
Florian Westphal (6):
      netfilter: nf_tables: use dev->name directly
      netfilter: nf_tables: free flow table struct too
      netfilter: nf_tables: fix memory leaks on chain rename
      netfilter: nf_tables: don't allow to rename to already-pending name
      netfilter: conntrack: dccp: treat SYNC/SYNCACK as invalid if no prior state
      netfilter: nf_tables: move dumper state allocation into ->start

Taehee Yoo (3):
      netfilter: nf_tables: fix jumpstack depth validation
      netfilter: nft_set_hash: add rcu_barrier() in the nft_rhash_destroy()
      netfilter: nft_set_rbtree: fix panic when destroying set by GC

 include/net/netfilter/nf_tables.h       |   5 +-
 net/netfilter/nf_conntrack_proto_dccp.c |   8 +-
 net/netfilter/nf_tables_api.c           | 304 +++++++++++++++++---------------
 net/netfilter/nft_immediate.c           |   3 +
 net/netfilter/nft_lookup.c              |  13 +-
 net/netfilter/nft_set_hash.c            |   1 +
 net/netfilter/nft_set_rbtree.c          |   7 +-
 7 files changed, 191 insertions(+), 150 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 13 Jun 2018 12:56:51 +0200

> The following patchset contains Netfilter patches for your net tree:
> 
> 1) Fix NULL pointer dereference from nf_nat_decode_session() if NAT is
>    not loaded, from Prashant Bhole.
> 
> 2) Fix socket extension module autoload.
> 
> 3) Don't bogusly reject sets with the NFT_SET_EVAL flag set on from
>    the dynset extension.
> 
> 4) Fix races with nf_tables module removal and netns exit path,
>    patches from Florian Westphal.
> 
> 5) Don't hit BUG_ON if jumpstack goes too deep, instead hit
>    WARN_ON_ONCE, from Taehee Yoo.
> 
> 6) Another NULL pointer dereference from ctnetlink, again if NAT is
>    not loaded, from Florian Westphal.
> 
> 7) Fix x_tables match list corruption in xt_connmark module removal
>    path, also from Florian.
> 
> 8) nf_conncount doesn't properly deal with conntrack zones, hence
>    garbage collector may get rid of entries in a different zone.
>    From Yi-Hung Wei.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thank you.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter patches for your net tree:

1) Fix NULL pointer dereference from nf_nat_decode_session() if NAT is
   not loaded, from Prashant Bhole.

2) Fix socket extension module autoload.

3) Don't bogusly reject sets with the NFT_SET_EVAL flag set on from
   the dynset extension.

4) Fix races with nf_tables module removal and netns exit path,
   patches from Florian Westphal.

5) Don't hit BUG_ON if jumpstack goes too deep, instead hit
   WARN_ON_ONCE, from Taehee Yoo.

6) Another NULL pointer dereference from ctnetlink, again if NAT is
   not loaded, from Florian Westphal.

7) Fix x_tables match list corruption in xt_connmark module removal
   path, also from Florian.

8) nf_conncount doesn't properly deal with conntrack zones, hence
   garbage collector may get rid of entries in a different zone.
   From Yi-Hung Wei.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 6892286e9c09925780fe2cb6db3585b56b71fe8e:

  tcp: Do not reload skb pointer after skb_gro_receive(). (2018-06-11 20:00:56 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 21ba8847f857028dc83a0f341e16ecc616e34740:

  netfilter: nf_conncount: Fix garbage collection with zones (2018-06-12 20:07:07 +0200)

----------------------------------------------------------------
Florian Westphal (4):
      netfilter: nf_tables: fix module unload race
      netfilter: nf_tables: close race between netns exit and rmmod
      netfilter: ctnetlink: avoid null pointer dereference
      netfilter: xt_connmark: fix list corruption on rmmod

Pablo Neira Ayuso (2):
      netfilter: nft_socket: fix module autoload
      netfilter: nft_dynset: do not reject set updates with NFT_SET_EVAL

Prashant Bhole (1):
      netfilter: fix null-ptr-deref in nf_nat_decode_session

Taehee Yoo (1):
      netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain()

Yi-Hung Wei (1):
      netfilter: nf_conncount: Fix garbage collection with zones

 include/linux/netfilter.h                  |  2 +-
 include/net/netfilter/nf_conntrack_count.h |  3 ++-
 include/uapi/linux/netfilter/nf_tables.h   |  2 +-
 net/netfilter/nf_conncount.c               | 13 +++++++++----
 net/netfilter/nf_conntrack_netlink.c       |  3 ++-
 net/netfilter/nf_tables_api.c              | 25 +++++++++++++++++++------
 net/netfilter/nf_tables_core.c             |  3 ++-
 net/netfilter/nfnetlink.c                  | 10 +++++++---
 net/netfilter/nft_chain_filter.c           |  5 +++++
 net/netfilter/nft_connlimit.c              |  2 +-
 net/netfilter/nft_dynset.c                 |  4 +---
 net/netfilter/nft_socket.c                 |  1 +
 net/netfilter/xt_connmark.c                |  2 +-
 13 files changed, 52 insertions(+), 23 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Fri, 14 Apr 2017 02:26:42 +0200

> The following patchset contains Netfilter fixes for your net tree,
> they are:
 ...
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks Pablo.

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for your net tree,
they are:

1) Missing TCP header sanity check in TCPMSS target, from Eric Dumazet.

2) Incorrect event message type for related conntracks created via
   ctnetlink, from Liping Zhang.

3) Fix incorrect rcu locking when handling helpers from ctnetlink,
   from Gao feng.

4) Fix missing rcu locking when updating helper, from Liping Zhang.

5) Fix missing read_lock_bh when iterating over list of device addresses
   from TPROXY and redirect, also from Liping.

6) Fix crash when trying to dump expectations from conntrack with no
   helper via ctnetlink, from Liping.

7) Missing RCU protection to expecation list update given ctnetlink
   iterates over the list under rcu read lock side, from Liping too.

8) Don't dump autogenerated seed in nft_hash to userspace, this is
   very confusing to the user, again from Liping.

9) Fix wrong conntrack netns module refcount in ipt_CLUSTERIP,
   from Gao feng.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit 0b9aefea860063bb39e36bd7fe6c7087fed0ba87:

  tcp: minimize false-positives on TCP/GRO check (2017-04-03 18:43:41 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to fe50543c194e2e1aee2f3eba41fcafd187b3dbde:

  netfilter: ipt_CLUSTERIP: Fix wrong conntrack netns refcnt usage (2017-04-13 23:21:40 +0200)

----------------------------------------------------------------
Eric Dumazet (1):
      netfilter: xt_TCPMSS: add more sanity tests on tcph->doff

Gao Feng (2):
      netfilter: helper: Add the rcu lock when call __nf_conntrack_helper_find
      netfilter: ipt_CLUSTERIP: Fix wrong conntrack netns refcnt usage

Liping Zhang (6):
      netfilter: ctnetlink: using bit to represent the ct event
      netfilter: ctnetlink: make it safer when checking the ct helper name
      netfilter: make it safer during the inet6_dev->addr_list traversal
      netfilter: ctnetlink: skip dumping expect when nfct_help(ct) is NULL
      netfilter: nf_ct_expect: use proper RCU list traversal/update APIs
      netfilter: nft_hash: do not dump the auto generated seed

 net/ipv4/netfilter/ipt_CLUSTERIP.c   |  2 +-
 net/netfilter/nf_conntrack_expect.c  |  4 ++--
 net/netfilter/nf_conntrack_helper.c  | 17 ++++++++++-----
 net/netfilter/nf_conntrack_netlink.c | 41 +++++++++++++++++++++++++-----------
 net/netfilter/nf_nat_redirect.c      |  2 ++
 net/netfilter/nft_hash.c             | 10 ++++++---
 net/netfilter/xt_TCPMSS.c            |  6 +++++-
 net/netfilter/xt_TPROXY.c            |  5 ++++-
 8 files changed, 62 insertions(+), 25 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 10 Aug 2016 20:56:25 +0200

> The following patchset contains Netfilter fixes for your net tree,
> they are:
 ...
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Pulled, thanks a lot Pablo!

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Resending as my robot didn't Cc netdev, sorry.

-o-

Hi David,

The following patchset contains Netfilter fixes for your net tree,
they are:

1) Use mod_timer_pending() to avoid reactivating a dead expectation in
   the h323 conntrack helper, from Liping Zhang.

2) Oneliner to fix a type in the register name defined in the nf_tables
   header.

3) Don't try to look further when we find an inactive elements with no
   descendants in the rbtree set implementation, otherwise we crash.

4) Handle valid zero CSeq in the SIP conntrack helper, from
   Christophe Leroy.

5) Don't display a trailing slash in conntrack helper with no classes
   via /proc/net/nf_conntrack_expect, from Liping Zhang.

6) Fix an expectation leak during creation from the nfqueue path, again
   from Liping Zhang.

7) Validate netlink port ID in verdict message from nfqueue, otherwise
   an injection can be possible. Again from Zhang.

8) Reject conntrack tuples with different transport protocol on
   original and reply tuples, also from Zhang.

9) Validate offset and length in nft_exthdr, make sure they are under
   sizeof(u8), from Laura Garcia Liebana.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit c518189567eaf42b2ec50a4d982484c8e38799f8:

  net: macb: Correct CAPS mask (2016-08-06 20:53:06 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 4da449ae1df9cfeb167e78f250b250eff64bc65e:

  netfilter: nft_exthdr: Add size check on u8 nft_exthdr attributes (2016-08-10 13:10:13 +0200)

----------------------------------------------------------------
Christophe Leroy (1):
      netfilter: nf_conntrack_sip: CSeq 0 is a valid CSeq

Laura Garcia Liebana (1):
      netfilter: nft_exthdr: Add size check on u8 nft_exthdr attributes

Liping Zhang (5):
      netfilter: nf_ct_h323: do not re-activate already expired timer
      netfilter: nf_ct_expect: remove the redundant slash when policy name is empty
      netfilter: nfnetlink_queue: fix memory leak when attach expectation successfully
      netfilter: nfnetlink_queue: reject verdict request from different portid
      netfilter: ctnetlink: reject new conntrack request with different l4proto

Pablo Neira Ayuso (2):
      netfilter: nf_tables: s/MFT_REG32_01/NFT_REG32_01
      netfilter: nft_rbtree: ignore inactive matching element with no descendants

 include/uapi/linux/netfilter/nf_tables.h |  2 +-
 net/netfilter/nf_conntrack_expect.c      |  2 +-
 net/netfilter/nf_conntrack_h323_main.c   |  3 ++-
 net/netfilter/nf_conntrack_netlink.c     | 10 ++++------
 net/netfilter/nf_conntrack_sip.c         |  4 ++--
 net/netfilter/nfnetlink_queue.c          |  6 ++----
 net/netfilter/nft_exthdr.c               | 11 +++++++++--
 net/netfilter/nft_rbtree.c               | 10 ++++++----
 8 files changed, 27 insertions(+), 21 deletions(-)

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for your net tree,
they are:

1) Use mod_timer_pending() to avoid reactivating a dead expectation in
   the h323 conntrack helper, from Liping Zhang.

2) Oneliner to fix a type in the register name defined in the nf_tables
   header.

3) Don't try to look further when we find an inactive elements with no
   descendants in the rbtree set implementation, otherwise we crash.

4) Handle valid zero CSeq in the SIP conntrack helper, from
   Christophe Leroy.

5) Don't display a trailing slash in conntrack helper with no classes
   via /proc/net/nf_conntrack_expect, from Liping Zhang.

6) Fix an expectation leak during creation from the nfqueue path, again
   from Liping Zhang.

7) Validate netlink port ID in verdict message from nfqueue, otherwise
   an injection can be possible. Again from Zhang.

8) Reject conntrack tuples with different transport protocol on
   original and reply tuples, also from Zhang.

9) Validate offset and length in nft_exthdr, make sure they are under
   sizeof(u8), from Laura Garcia Liebana.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit c518189567eaf42b2ec50a4d982484c8e38799f8:

  net: macb: Correct CAPS mask (2016-08-06 20:53:06 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 4da449ae1df9cfeb167e78f250b250eff64bc65e:

  netfilter: nft_exthdr: Add size check on u8 nft_exthdr attributes (2016-08-10 13:10:13 +0200)

----------------------------------------------------------------
Christophe Leroy (1):
      netfilter: nf_conntrack_sip: CSeq 0 is a valid CSeq

Laura Garcia Liebana (1):
      netfilter: nft_exthdr: Add size check on u8 nft_exthdr attributes

Liping Zhang (5):
      netfilter: nf_ct_h323: do not re-activate already expired timer
      netfilter: nf_ct_expect: remove the redundant slash when policy name is empty
      netfilter: nfnetlink_queue: fix memory leak when attach expectation successfully
      netfilter: nfnetlink_queue: reject verdict request from different portid
      netfilter: ctnetlink: reject new conntrack request with different l4proto

Pablo Neira Ayuso (2):
      netfilter: nf_tables: s/MFT_REG32_01/NFT_REG32_01
      netfilter: nft_rbtree: ignore inactive matching element with no descendants

 include/uapi/linux/netfilter/nf_tables.h |  2 +-
 net/netfilter/nf_conntrack_expect.c      |  2 +-
 net/netfilter/nf_conntrack_h323_main.c   |  3 ++-
 net/netfilter/nf_conntrack_netlink.c     | 10 ++++------
 net/netfilter/nf_conntrack_sip.c         |  4 ++--
 net/netfilter/nfnetlink_queue.c          |  6 ++----
 net/netfilter/nft_exthdr.c               | 11 +++++++++--
 net/netfilter/nft_rbtree.c               | 10 ++++++----
 8 files changed, 27 insertions(+), 21 deletions(-)

Re: [PATCH 0/9] Netfilter fixes for net

[David Miller]

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 28 Mar 2016 19:57:53 +0200

> The following patchset contains Netfilter fixes for you net tree,
> they are:
 ...
> This batch comes with four patches to validate x_tables blobs coming
> from userspace. CONFIG_USERNS exposes the x_tables interface to
> unpriviledged users and to be honest this interface never received the
> attention for this move away from the CAP_NET_ADMIN domain. Florian is
> working on another round with more patches with more sanity checks, so
> expect a bit more Netfilter fixes in this development cycle than usual.
> 
> You can pull these changes from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Looks good, pulled, thanks Pablo!

[PATCH 0/9] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi David,

The following patchset contains Netfilter fixes for you net tree,
they are:

1) There was a race condition between parallel save/swap and delete,
   which resulted a kernel crash due to the increase ref for save, swap,
   wrong ref decrease operations. Reported and fixed by Vishwanath Pai.

2) OVS should call into CT NAT for packets of new expected connections only
   when the conntrack state is persisted with the 'commit' option to the
   OVS CT action. From Jarno Rajahalme.

3) Resolve kconfig dependencies with new OVS NAT support. From Arnd Bergmann.

4) Early validation of entry->target_offset to make sure it doesn't take us
   out from the blob, from Florian Westphal.

5) Again early validation of entry->next_offset to make sure it doesn't take
   out from the blob, also from Florian.

6) Check that entry->target_offset is always of of sizeof(struct xt_entry)
   for unconditional entries, when checking both from check_underflow()
   and when checking for loops in mark_source_chains(), again from
   Florian.

7) Fix inconsistent behaviour in nfnetlink_queue when
   NFQA_CFG_F_FAIL_OPEN is set and netlink_unicast() fails due to buffer
   overrun, we have to reinject the packet as the user expects.

8) Enforce nul-terminated table names from getsockopt GET_ENTRIES
   requests.

9) Don't assume skb->sk is set from nft_bridge_reject and synproxy,
   this fixes a recent update of the code to namespaceify
   ip_default_ttl, patch from Liping Zhang.

This batch comes with four patches to validate x_tables blobs coming
from userspace. CONFIG_USERNS exposes the x_tables interface to
unpriviledged users and to be honest this interface never received the
attention for this move away from the CAP_NET_ADMIN domain. Florian is
working on another round with more patches with more sanity checks, so
expect a bit more Netfilter fixes in this development cycle than usual.

You can pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git

Thanks!

----------------------------------------------------------------

The following changes since commit d7be81a5916bdb1d904803958e5991a16f7ae4b2:

  ravb: fix software timestamping (2016-03-27 22:41:37 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git HEAD

for you to fetch changes up to 29421198c3a860092e27c2ad8499dfe603398817:

  netfilter: ipv4: fix NULL dereference (2016-03-28 17:59:29 +0200)

----------------------------------------------------------------
Arnd Bergmann (1):
      openvswitch: call only into reachable nf-nat code

Florian Westphal (3):
      netfilter: x_tables: validate e->target_offset early
      netfilter: x_tables: make sure e->next_offset covers remaining blob size
      netfilter: x_tables: fix unconditional helper

Jarno Rajahalme (1):
      openvswitch: Fix checking for new expected connections.

Liping Zhang (1):
      netfilter: ipv4: fix NULL dereference

Pablo Neira Ayuso (2):
      netfilter: nfnetlink_queue: honor NFQA_CFG_F_FAIL_OPEN when netlink unicast fails
      netfilter: x_tables: enforce nul-terminated table name from getsockopt GET_ENTRIES

Vishwanath Pai (1):
      netfilter: ipset: fix race condition in ipset save, swap and delete

 include/linux/netfilter/ipset/ip_set.h   |  4 +++
 net/bridge/netfilter/ebtables.c          |  4 +++
 net/bridge/netfilter/nft_reject_bridge.c | 20 ++++++------
 net/ipv4/netfilter/arp_tables.c          | 43 +++++++++++++------------
 net/ipv4/netfilter/ip_tables.c           | 48 ++++++++++++++--------------
 net/ipv4/netfilter/ipt_SYNPROXY.c        | 54 +++++++++++++++++---------------
 net/ipv6/netfilter/ip6_tables.c          | 48 ++++++++++++++--------------
 net/netfilter/ipset/ip_set_bitmap_gen.h  |  2 +-
 net/netfilter/ipset/ip_set_core.c        | 33 ++++++++++++++++---
 net/netfilter/ipset/ip_set_hash_gen.h    |  2 +-
 net/netfilter/ipset/ip_set_list_set.c    |  2 +-
 net/netfilter/nfnetlink_queue.c          |  7 ++++-
 net/openvswitch/Kconfig                  |  4 ++-
 net/openvswitch/conntrack.c              | 21 +++++++------
 14 files changed, 170 insertions(+), 122 deletions(-)