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netfilter: nf_flowtable: skip device lookup from interface index

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Use the output device from the route that we cache in the flowtable
entry.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-03-20 08:40:47 +01:00
parent b3dfee340a
commit 227e1e4d0d
1 changed files with 2 additions and 8 deletions
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10
net/netfilter/nf_flow_table_ip.c
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@ -235,13 +235,10 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
if (tuplehash == NULL)
return NF_ACCEPT;
outdev = dev_get_by_index_rcu(state->net, tuplehash->tuple.oifidx);
if (!outdev)
return NF_ACCEPT;
dir = tuplehash->tuple.dir;
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
rt = (struct rtable *)flow->tuplehash[dir].tuple.dst_cache;
outdev = rt->dst.dev;
if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)) &&
(ip_hdr(skb)->frag_off & htons(IP_DF)) != 0)
@ -452,13 +449,10 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
if (tuplehash == NULL)
return NF_ACCEPT;
outdev = dev_get_by_index_rcu(state->net, tuplehash->tuple.oifidx);
if (!outdev)
return NF_ACCEPT;
dir = tuplehash->tuple.dir;
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
rt = (struct rt6_info *)flow->tuplehash[dir].tuple.dst_cache;
outdev = rt->dst.dev;
if (unlikely(nf_flow_exceeds_mtu(skb, flow->tuplehash[dir].tuple.mtu)))
return NF_ACCEPT;