From 46af31800b6916c92fffa529dc3c357008da957d Mon Sep 17 00:00:00 2001 From: Hiroaki SHIMODA Date: Wed, 9 Mar 2011 20:09:58 +0000 Subject: ipv4: Fix PMTU update. On current net-next-2.6, when Linux receives ICMP Type: 3, Code: 4 (Destination unreachable (Fragmentation needed)), icmp_unreach -> ip_rt_frag_needed (peer->pmtu_expires is set here) -> tcp_v4_err -> do_pmtu_discovery -> ip_rt_update_pmtu (peer->pmtu_expires is already set, so check_peer_pmtu is skipped.) -> check_peer_pmtu check_peer_pmtu is skipped and MTU is not updated. To fix this, let check_peer_pmtu execute unconditionally. And some minor fixes 1) Avoid potential peer->pmtu_expires set to be zero. 2) In check_peer_pmtu, argument of time_before is reversed. 3) check_peer_pmtu expects peer->pmtu_orig is initialized as zero, but not initialized. Signed-off-by: Hiroaki SHIMODA Signed-off-by: David S. Miller --- net/ipv4/inetpeer.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/ipv4/inetpeer.c') diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c index 6442c35edb0b..86b1d0878dff 100644 --- a/net/ipv4/inetpeer.c +++ b/net/ipv4/inetpeer.c @@ -511,6 +511,7 @@ struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create) p->rate_tokens = 0; p->rate_last = 0; p->pmtu_expires = 0; + p->pmtu_orig = 0; memset(&p->redirect_learned, 0, sizeof(p->redirect_learned)); INIT_LIST_HEAD(&p->unused); -- cgit v1.2.3-59-g8ed1b