From 1aba721eba1d84a2defce45b950272cee1e6c72a Mon Sep 17 00:00:00 2001
From: Gilad Ben-Yossef <gilad@codefidence.com>
Date: Wed, 28 Oct 2009 04:15:24 +0000
Subject: Add the no SACK route option feature

Implement querying and acting upon the no sack bit in the features
field.

Signed-off-by: Gilad Ben-Yossef <gilad@codefidence.com>
Sigend-off-by: Ori Finkelman <ori@comsleep.com>
Sigend-off-by: Yony Amit <yony@comsleep.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp_input.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'net/ipv4/tcp_input.c')

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index c7625005486d..5fb25f977451 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3763,7 +3763,8 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
 				break;
 			case TCPOPT_SACK_PERM:
 				if (opsize == TCPOLEN_SACK_PERM && th->syn &&
-				    !estab && sysctl_tcp_sack) {
+				    !estab && sysctl_tcp_sack &&
+				    !dst_feature(dst, RTAX_FEATURE_NO_SACK)) {
 					opt_rx->sack_ok = 1;
 					tcp_sack_reset(opt_rx);
 				}
-- 
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