[PATCH 3.16 090/192] net: reflect mark on tcp syn ack packets

[Ben Hutchings]

3.16.49-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>

commit e05a90ec9e1680952454ea9510da9a761a5baac9 upstream.

SYN-ACK responses on a server in response to a SYN from a client
did not get the injected skb mark that was tagged on the SYN packet.

Fixes: 84f39b08d786 ("net: support marking accepting TCP sockets")
Reviewed-by: Lorenzo Colitti <lorenzo@xxxxxxxxxx>
Signed-off-by: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/ipv4/ip_output.c  | 3 ++-
 net/ipv4/tcp_output.c | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -158,7 +158,8 @@ int ip_build_and_send_pkt(struct sk_buff
 	}
 
 	skb->priority = sk->sk_priority;
-	skb->mark = sk->sk_mark;
+	if (!skb->mark)
+		skb->mark = sk->sk_mark;
 
 	/* Send it out. */
 	return ip_local_out(skb);
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2863,6 +2863,7 @@ struct sk_buff *tcp_make_synack(struct s
 	TCP_ECN_make_synack(req, th);
 	th->source = htons(ireq->ir_num);
 	th->dest = ireq->ir_rmt_port;
+	skb->mark = ireq->ir_mark;
 	/* Setting of flags are superfluous here for callers (and ECE is
 	 * not even correctly set)
 	 */