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authorKOVACS Krisztian <hidden@sch.bme.hu>2008-10-01 14:46:49 (GMT)
committerDavid S. Miller <davem@davemloft.net>2008-10-01 14:46:49 (GMT)
commita3116ac5c216fc3c145906a46df9ce542ff7dcf2 (patch)
tree6b2b43b5bacac2b358566e4b7ca0adda45a3e52b /net/ipv4/syncookies.c
parent86b08d867d7de001ab224180ed7865fab93fd56e (diff)
downloadlinux-a3116ac5c216fc3c145906a46df9ce542ff7dcf2.tar.xz
tcp: Port redirection support for TCP
Current TCP code relies on the local port of the listening socket being the same as the destination address of the incoming connection. Port redirection used by many transparent proxying techniques obviously breaks this, so we have to store the original destination port address. This patch extends struct inet_request_sock and stores the incoming destination port value there. It also modifies the handshake code to use that value as the source port when sending reply packets. Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/syncookies.c')
-rw-r--r--net/ipv4/syncookies.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 929302b..d346c22 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -297,6 +297,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
treq->rcv_isn = ntohl(th->seq) - 1;
treq->snt_isn = cookie;
req->mss = mss;
+ ireq->loc_port = th->dest;
ireq->rmt_port = th->source;
ireq->loc_addr = ip_hdr(skb)->daddr;
ireq->rmt_addr = ip_hdr(skb)->saddr;