From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Emelyanov Subject: [PATCH 5/6] tcp: Report mss_clamp with TCP_MAXSEG option in repair mode Date: Thu, 19 Apr 2012 17:41:32 +0400 Message-ID: <4F90160C.1070605@parallels.com> References: <4F901572.4040009@parallels.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: Linux Netdev List , David Miller Return-path: Received: from mailhub.sw.ru ([195.214.232.25]:28464 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752808Ab2DSNlj (ORCPT ); Thu, 19 Apr 2012 09:41:39 -0400 In-Reply-To: <4F901572.4040009@parallels.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- 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