netdev - [PATCH 5/6] tcp: Report mss_clamp with TCP

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Message-ID: <4F90160C.1070605@parallels.com>
Date:	Thu, 19 Apr 2012 17:41:32 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Linux Netdev List <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: [PATCH 5/6] 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@...nvz.org>
---
 net/ipv4/tcp.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

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);
-- 
1.5.5.6
--
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