From: Tao Wu <ytht.net@gmail.com>
Date: Sat, 29 Apr 2017 17:20:56 +0000 (+0200)
Subject: slirp: Fix wrong mss bug.
X-Git-Tag: v2.10.0-rc0~170^2~2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c7990a26480032ad129f8c4ddad7d9a132c934ca;p=thirdparty%2Fqemu.git

slirp: Fix wrong mss bug.

This bug was introduced by https://github.com/qemu/qemu/commit/98c6305

Signed-off-by: Tao Wu <lepton@google.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-bu: Samuel Thibault <samuel.thibault@ens-lyon.org>
---

diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index edb98f06f30..07bcbdb2ddd 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -1587,11 +1587,11 @@ tcp_mss(struct tcpcb *tp, u_int offer)
 	switch (so->so_ffamily) {
 	case AF_INET:
             mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
-	                              + sizeof(struct ip);
+	                              - sizeof(struct ip);
 	    break;
 	case AF_INET6:
             mss = MIN(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
-	                              + sizeof(struct ip6);
+	                              - sizeof(struct ip6);
 	    break;
 	default:
 	    g_assert_not_reached();