[TCP]: Honour sk_bound_dev_if in tcp_v4_send_ack

A time_wait socket inherits sk_bound_dev_if from the original socket,
but it is not used when sending ACK packets using ip_send_reply.

Fix by passing the oif to ip_send_reply in struct ip_reply_arg and
use it for output routing.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/ip.h b/include/net/ip.h
index bb207db03675..abf2820a1125 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -143,6 +143,7 @@ struct ip_reply_arg {
         __wsum      csum;
         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
                                 /* -1 if not needed */ 
+        int         bound_dev_if;
 }; 
 
 void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,