commit 16f86165bd0a94a96ab99629828cc9057db50221
author Eric Dumazet <edumazet@google.com> Fri Mar 13 15:51:10 2015 -0700
committer David S. Miller <davem@davemloft.net> Sat Mar 14 15:05:10 2015 -0400
tree abb1a7c6f69f2f424dd08e035091945d252dd141
parent a3795208b9a9801a66b305395e9ebaae850eee03

inet: fill request sock ir_iif for IPv4

Once request socks will be in ehash table, they will need to have
a valid ir_iff field.

This is currently true only for IPv6. This patch extends support
for IPv4 as well.

This means inet_diag_fill_req() can now properly use ir_iif,
which is better for IPv6 link locals anyway, as request sockets
and established sockets will propagate consistent netlink idiag_if.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dccp/ipv4.c

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 8f6f400..7f6456a 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -643,6 +643,7 @@
 	ireq->ir_rmt_addr = ip_hdr(skb)->saddr;
 	write_pnet(&ireq->ireq_net, sock_net(sk));
 	ireq->ireq_family = AF_INET;
+	ireq->ir_iif = sk->sk_bound_dev_if;
 
 	/*
 	 * Step 3: Process LISTEN state

net/ipv4/inet_diag.c

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 43789c9..e1e4d8c 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -733,7 +733,7 @@
 	r->idiag_timer = 1;
 	r->idiag_retrans = req->num_retrans;
 
-	r->id.idiag_if = sk->sk_bound_dev_if;
+	r->id.idiag_if = ireq->ir_iif;
 
 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 		     offsetof(struct sock, sk_cookie));

net/ipv4/syncookies.c

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 0c43273..f17db89 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -349,6 +349,8 @@
 	write_pnet(&ireq->ireq_net, sock_net(sk));
 	ireq->ireq_family = AF_INET;
 
+	ireq->ir_iif = sk->sk_bound_dev_if;
+
 	/* We throwed the options of the initial SYN away, so we hope
 	 * the ACK carries the same options again (see RFC1122 4.2.3.8)
 	 */

net/ipv4/tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index da61a8e..717d437 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5967,6 +5967,9 @@
 	tcp_openreq_init(req, &tmp_opt, skb, sk);
 	write_pnet(&inet_rsk(req)->ireq_net, sock_net(sk));
 
+	/* Note: tcp_v6_init_req() might override ir_iif for link locals */
+	inet_rsk(req)->ir_iif = sk->sk_bound_dev_if;
+
 	af_ops->init_req(req, sk, skb);
 
 	if (security_inet_conn_request(sk, skb, req))

net/ipv6/tcp_ipv6.c

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c5fc6a5..d89f028 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -734,8 +734,6 @@
 	ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
 	ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
 
-	ireq->ir_iif = sk->sk_bound_dev_if;
-
 	/* So that link locals have meaning */
 	if (!sk->sk_bound_dev_if &&
 	    ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)