Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter/IPVS updates for net-next

The following patchset contains Netfilter/IPVS updates for your net-next
tree, the most relevant things in this batch are:

1) Compile masquerade infrastructure into NAT module, from Florian Westphal.
   Same thing with the redirection support.

2) Abort transaction if early initialization of the commit phase fails.
   Also from Florian.

3) Get rid of synchronize_rcu() by using rule array in nf_tables, from
   Florian.

4) Abort nf_tables batch if fatal signal is pending, from Florian.

5) Use .call_rcu nfnetlink from nf_tables to make dumps fully lockless.
   From Florian Westphal.

6) Support to match transparent sockets from nf_tables, from Máté Eckl.

7) Audit support for nf_tables, from Phil Sutter.

8) Validate chain dependencies from commit phase, fall back to fine grain
   validation only in case of errors.

9) Attach dst to skbuff from netfilter flowtable packet path, from
   Jason A. Donenfeld.

10) Use artificial maximum attribute cap to remove VLA from nfnetlink.
    Patch from Kees Cook.

11) Add extension to allow to forward packets through neighbour layer.

12) Add IPv6 conntrack helper support to IPVS, from Julian Anastasov.

13) Add IPv6 FTP conntrack support to IPVS, from Julian Anastasov.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 11 deletions

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index 1d99a1efdafc..8d1ff654e5af 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -611,10 +611,10 @@ nla_put_failure:
 	return -1;
 }
 
-static int nfnl_compat_get(struct net *net, struct sock *nfnl,
-			   struct sk_buff *skb, const struct nlmsghdr *nlh,
-			   const struct nlattr * const tb[],
-			   struct netlink_ext_ack *extack)
+static int nfnl_compat_get_rcu(struct net *net, struct sock *nfnl,
+			       struct sk_buff *skb, const struct nlmsghdr *nlh,
+			       const struct nlattr * const tb[],
+			       struct netlink_ext_ack *extack)
 {
 	int ret = 0, target;
 	struct nfgenmsg *nfmsg;
@@ -653,16 +653,21 @@ static int nfnl_compat_get(struct net *net, struct sock *nfnl,
 		return -EINVAL;
 	}
 
+	if (!try_module_get(THIS_MODULE))
+		return -EINVAL;
+
+	rcu_read_unlock();
 	try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
 						 rev, target, &ret),
 						 fmt, name);
-
 	if (ret < 0)
-		return ret;
+		goto out_put;
 
 	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (skb2 == NULL)
-		return -ENOMEM;
+	if (skb2 == NULL) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
 
 	/* include the best revision for this extension in the message */
 	if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
@@ -672,14 +677,16 @@ static int nfnl_compat_get(struct net *net, struct sock *nfnl,
 				  nfmsg->nfgen_family,
 				  name, ret, target) <= 0) {
 		kfree_skb(skb2);
-		return -ENOSPC;
+		goto out_put;
 	}
 
 	ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
 				MSG_DONTWAIT);
 	if (ret > 0)
 		ret = 0;
-
+out_put:
+	rcu_read_lock();
+	module_put(THIS_MODULE);
 	return ret == -EAGAIN ? -ENOBUFS : ret;
 }
 
@@ -691,7 +698,7 @@ static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
 };
 
 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
-	[NFNL_MSG_COMPAT_GET]		= { .call = nfnl_compat_get,
+	[NFNL_MSG_COMPAT_GET]		= { .call_rcu = nfnl_compat_get_rcu,
 					    .attr_count = NFTA_COMPAT_MAX,
 					    .policy = nfnl_compat_policy_get },
 };