diff options
| author | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2021-07-14 21:07:37 +0000 |
|---|---|---|
| committer | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2021-07-14 21:07:37 +0000 |
| commit | ecefebaf30d9902e192fa66cae2e53a833ee6f9c (patch) | |
| tree | 57a9717936b462bdc9d50b4890a2fdaa813c3804 | |
| parent | 992d0c8ef315555d90686d8ef39aea6c64297b9b (diff) | |
Resend the TCP packet only if the MTU locked flag appears at the
route and was not there before. This should prevent a recursion
in path MTU discovery with TCP over IPsec.
reported and tested Matthias Schmidt; tested and OK tobhe@
| -rw-r--r-- | sys/netinet/tcp_subr.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index 6b83571c777..249c1aada3e 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tcp_subr.c,v 1.178 2021/07/08 21:07:19 bluhm Exp $ */ +/* $OpenBSD: tcp_subr.c,v 1.179 2021/07/14 21:07:36 bluhm Exp $ */ /* $NetBSD: tcp_subr.c,v 1.22 1996/02/13 23:44:00 christos Exp $ */ /* @@ -845,6 +845,8 @@ tcp_mtudisc(struct inpcb *inp, int errno) rt = in_pcbrtentry(inp); if (rt != NULL) { + unsigned int orig_mtulock = (rt->rt_locks & RTV_MTU); + /* * If this was not a host route, remove and realloc. */ @@ -853,7 +855,7 @@ tcp_mtudisc(struct inpcb *inp, int errno) if ((rt = in_pcbrtentry(inp)) == NULL) return; } - if (rt->rt_locks & RTV_MTU) + if (orig_mtulock < (rt->rt_locks & RTV_MTU)) change = 1; } tcp_mss(tp, -1); |