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

Ben Hutchings
2017-10-09T12:51:30Z

From: Jamal Hadi Salim <jhs@mojatatu.com>

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@google.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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)
*/