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[05/11] netfilter: nat: fix cmp return value

Message ID 1480543045-3389-6-git-send-email-pablo@netfilter.org
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Pablo Neira Ayuso Nov. 30, 2016, 9:57 p.m. UTC 
From: Florian Westphal <fw@strlen.de>

The comparator works like memcmp, i.e. 0 means objects are equal.
In other words, when objects are distinct they are treated as identical,
when they are distinct they are allegedly the same.

The first case is rare (distinct objects are unlikely to get hashed to
same bucket).

The second case results in unneeded port conflict resolutions attempts.

Fixes: 870190a9ec907 ("netfilter: nat: convert nat bysrc hash to rhashtable")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_nat_core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index bbb8f3df79f7..c632429706eb 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -193,9 +193,12 @@  static int nf_nat_bysource_cmp(struct rhashtable_compare_arg *arg,
 	const struct nf_nat_conn_key *key = arg->key;
 	const struct nf_conn *ct = obj;
 
-	return same_src(ct, key->tuple) &&
-	       net_eq(nf_ct_net(ct), key->net) &&
-	       nf_ct_zone_equal(ct, key->zone, IP_CT_DIR_ORIGINAL);
+	if (!same_src(ct, key->tuple) ||
+	    !net_eq(nf_ct_net(ct), key->net) ||
+	    !nf_ct_zone_equal(ct, key->zone, IP_CT_DIR_ORIGINAL))
+		return 1;
+
+	return 0;
 }
 
 static struct rhashtable_params nf_nat_bysource_params = {