path: root/net/ipv4/netfilter
diff options
authorJesper Dangaard Brouer <brouer@redhat.com>2013-08-29 12:18:46 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2013-09-04 11:44:23 +0200
commit7cc9eb6ef78d0dcb97d543ea19966486e98afa0b (patch)
treee5b55540fbae354d72709d3679360d7b21fffb1c /net/ipv4/netfilter
parentf4de4c89d89df5ead42de9fea895f5b8155270da (diff)
netfilter: SYNPROXY: let unrelated packets continue
Packets reaching SYNPROXY were default dropped, as they were most likely invalid (given the recommended state matching). This patch, changes SYNPROXY target to let packets, not consumed, continue being processed by the stack. This will be more in line other target modules. As it will allow more flexible configurations of handling, logging or matching on packets in INVALID states. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4/netfilter')
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 90e489eb1c0a..67e17dcda65e 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -285,11 +285,15 @@ synproxy_tg4(struct sk_buff *skb, const struct xt_action_param *par)
synproxy_send_client_synack(skb, th, &opts);
- } else if (th->ack && !(th->fin || th->rst || th->syn))
+ return NF_DROP;
+ } else if (th->ack && !(th->fin || th->rst || th->syn)) {
/* ACK from client */
synproxy_recv_client_ack(snet, skb, th, &opts, ntohl(th->seq));
+ return NF_DROP;
+ }
- return NF_DROP;
+ return XT_CONTINUE;
static unsigned int ipv4_synproxy_hook(unsigned int hooknum,