netdev - [PATCH nf-next v4 2/2] nf_set_hooks_head: accommodate different kconfig

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Date:   Wed, 28 Sep 2016 11:35:15 -0400
From:   Aaron Conole <aconole@...heb.org>
To:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH nf-next v4 2/2] nf_set_hooks_head: accommodate different kconfig

When CONFIG_NETFILTER_INGRESS is unset (or no), we need to handle
the request for registration properly by dropping the hook.  This
releases the entry during the set.

Fixes: e3b37f11e6e4 ("netfilter: replace list_head with single linked list")
Signed-off-by: Aaron Conole <aconole@...heb.org>
---
 net/netfilter/core.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index e58e420..61e8a9d 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -90,10 +90,12 @@ static void nf_set_hooks_head(struct net *net, const struct nf_hook_ops *reg,
 {
 	switch (reg->pf) {
 	case NFPROTO_NETDEV:
+#ifdef CONFIG_NETFILTER_INGRESS
 		/* We already checked in nf_register_net_hook() that this is
 		 * used from ingress.
 		 */
 		rcu_assign_pointer(reg->dev->nf_hooks_ingress, entry);
+#endif
 		break;
 	default:
 		rcu_assign_pointer(net->nf.hooks[reg->pf][reg->hooknum],
@@ -107,10 +109,15 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
 	struct nf_hook_entry *hooks_entry;
 	struct nf_hook_entry *entry;
 
-	if (reg->pf == NFPROTO_NETDEV &&
-	    (reg->hooknum != NF_NETDEV_INGRESS ||
-	     !reg->dev || dev_net(reg->dev) != net))
-		return -EINVAL;
+	if (reg->pf == NFPROTO_NETDEV) {
+#ifndef CONFIG_NETFILTER_INGRESS
+		if (reg->hooknum == NF_NETDEV_INGRESS)
+			return -EOPNOTSUPP;
+#endif
+		if (reg->hooknum != NF_NETDEV_INGRESS ||
+		    !reg->dev || dev_net(reg->dev) != net)
+			return -EINVAL;
+	}
 
 	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry)
-- 
2.7.4