Commit e2446eaa authored by Shawn Lu's avatar Shawn Lu Committed by David S. Miller

tcp_v4_send_reset: binding oif to iif in no sock case

Binding RST packet outgoing interface to incoming interface
for tcp v4 when there is no socket associate with it.
when sk is not NULL, using sk->sk_bound_dev_if instead.
(suggested by Eric Dumazet).

This has few benefits:
1. tcp_v6_send_reset already did that.
2. This helps tcp connect with SO_BINDTODEVICE set. When
connection is lost, we still able to sending out RST using
same interface.
3. we are sending reply, it is most likely to be succeed
if iif is used
Signed-off-by: default avatarShawn Lu <shawn.lu@ericsson.com>
Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5962b35c
...@@ -651,6 +651,11 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) ...@@ -651,6 +651,11 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
arg.iov[0].iov_len, IPPROTO_TCP, 0); arg.iov[0].iov_len, IPPROTO_TCP, 0);
arg.csumoffset = offsetof(struct tcphdr, check) / 2; arg.csumoffset = offsetof(struct tcphdr, check) / 2;
arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0;
/* When socket is gone, all binding information is lost.
* routing might fail in this case. using iif for oif to
* make sure we can deliver it
*/
arg.bound_dev_if = sk ? sk->sk_bound_dev_if : inet_iif(skb);
net = dev_net(skb_dst(skb)->dev); net = dev_net(skb_dst(skb)->dev);
arg.tos = ip_hdr(skb)->tos; arg.tos = ip_hdr(skb)->tos;
......
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