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tcp/dccp: fix behavior of stale SYN_RECV request sockets

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When a TCP/DCCP listener is closed, its pending SYN_RECV request sockets
become stale, meaning 3WHS can not complete.

But current behavior is wrong :
incoming packets finding such stale sockets are dropped.

We need instead to cleanup the request socket and perform another
lookup :
- Incoming ACK will give a RST answer,
- SYN rtx might find another listener if available.
- We expedite cleanup of request sockets and old listener socket.

Fixes: 079096f103 ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-13 17:12:54 -07:00 • committed by David S. Miller
parent bbb300eb97
commit 4bdc3d6614
4 changed files with 26 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

7
net/ipv6/tcp_ipv6.c
View file

@ -1363,6 +1363,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
th = tcp_hdr(skb);
hdr = ipv6_hdr(skb);
lookup:
sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest,
inet6_iif(skb));
if (!sk)
@ -1382,8 +1383,12 @@ process:
reqsk_put(req);
goto discard_it;
}
if (sk->sk_state == TCP_LISTEN)
if (likely(sk->sk_state == TCP_LISTEN)) {
nsk = tcp_check_req(sk, skb, req, false);
} else {
inet_csk_reqsk_queue_drop(sk, req);
goto lookup;
}
if (!nsk) {
reqsk_put(req);
goto discard_it;