From: Pavel Emelyanov <xemul@parallels.com>
Date: Thu, 19 Apr 2012 03:41:32 +0000 (+0000)
Subject: tcp: Report mss_clamp with TCP_MAXSEG option in repair mode
X-Git-Tag: v3.5-rc1~109^2~329
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5e6a3ce6573f0c519d1ff57df60e3877bb2d3151;p=platform%2Fkernel%2Flinux-3.10.git

tcp: Report mss_clamp with TCP_MAXSEG option in repair mode

The mss_clamp is the only connection-time negotiated option which
cannot be obtained from the user space. Make the TCP_MAXSEG sockopt
report one in the repair mode.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 47e2f49..b4e690d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2659,6 +2659,8 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 		val = tp->mss_cache;
 		if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 			val = tp->rx_opt.user_mss;
+		if (tp->repair)
+			val = tp->rx_opt.mss_clamp;
 		break;
 	case TCP_NODELAY:
 		val = !!(tp->nonagle&TCP_NAGLE_OFF);