diff options
| author | Jiri Pirko <jiri@resnulli.us> | 2013-11-06 17:52:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-11 06:19:35 +0100 |
| commit | 6aafeef03b9d9ecf255f3a80ed85ee070260e1ae (patch) | |
| tree | 48c7f8ff1709c9874342c02c7039d4431a00b333 /net/core | |
| parent | ip6_output: fragment outgoing reassembled skb properly (diff) | |
| download | linux-6aafeef03b9d9ecf255f3a80ed85ee070260e1ae.tar.xz linux-6aafeef03b9d9ecf255f3a80ed85ee070260e1ae.zip | |
netfilter: push reasm skb through instead of original frag skbs
Pushing original fragments through causes several problems. For example
for matching, frags may not be matched correctly. Take following
example:
<example>
On HOSTA do:
ip6tables -I INPUT -p icmpv6 -j DROP
ip6tables -I INPUT -p icmpv6 -m icmp6 --icmpv6-type 128 -j ACCEPT
and on HOSTB you do:
ping6 HOSTA -s2000 (MTU is 1500)
Incoming echo requests will be filtered out on HOSTA. This issue does
not occur with smaller packets than MTU (where fragmentation does not happen)
</example>
As was discussed previously, the only correct solution seems to be to use
reassembled skb instead of separete frags. Doing this has positive side
effects in reducing sk_buff by one pointer (nfct_reasm) and also the reams
dances in ipvs and conntrack can be removed.
Future plan is to remove net/ipv6/netfilter/nf_conntrack_reasm.c
entirely and use code in net/ipv6/reassembly.c instead.
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/skbuff.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 8c5197fe55a4..8cec1e6b844d 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -592,9 +592,6 @@ static void skb_release_head_state(struct sk_buff *skb) #if IS_ENABLED(CONFIG_NF_CONNTRACK) nf_conntrack_put(skb->nfct); #endif -#ifdef NET_SKBUFF_NF_DEFRAG_NEEDED - nf_conntrack_put_reasm(skb->nfct_reasm); -#endif #ifdef CONFIG_BRIDGE_NETFILTER nf_bridge_put(skb->nf_bridge); #endif |