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netfilter: SYNPROXY: let unrelated packets continue

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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>
This commit is contained in:
Jesper Dangaard Brouer 2013-08-29 12:18:46 +02:00 committed by Pablo Neira Ayuso
parent f4de4c89d8
commit 7cc9eb6ef7
2 changed files with 12 additions and 4 deletions
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8
net/ipv4/netfilter/ipt_SYNPROXY.c
View file

@ -285,11 +285,15 @@ synproxy_tg4(struct sk_buff *skb, const struct xt_action_param *par)
XT_SYNPROXY_OPT_ECN);
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,

8
net/ipv6/netfilter/ip6t_SYNPROXY.c
View file

@ -300,11 +300,15 @@ synproxy_tg6(struct sk_buff *skb, const struct xt_action_param *par)
XT_SYNPROXY_OPT_ECN);
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 ipv6_synproxy_hook(unsigned int hooknum,