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Date:	Sun, 23 Mar 2014 11:47:40 +0800
From:	Wangyufen <wangyufen@...wei.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	Wang Yufen <wangyufen@...wei.com>
Subject: [PATCH net-next 2/2] net: tcp_ipv6 policy route issue

From: Wang Yufen <wangyufen@...wei.com>

    The issue raises when adding policy route,specify a particular
    NIC as oif. The policy route did not take effect.
    The reason is that fl6.oif is not set and route map failed.

    From the tcp_v6_send_response function:
    If the binding address is linklocal, fl6.oif is set,
    but not for global address.

Signed-off-by: Wang Yufen <wangyufen@...wei.com>
---
 net/ipv6/tcp_ipv6.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f6f38fe..066f36f 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -726,7 +726,7 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
 #endif
 
 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
-				 u32 tsval, u32 tsecr,
+				 u32 tsval, u32 tsecr, int oif,
 				 struct tcp_md5sig_key *key, int rst, u8 tclass,
 				 u32 label)
 {
@@ -802,6 +802,8 @@ static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
 		fl6.flowi6_oif = inet6_iif(skb);
 	fl6.fl6_dport = t1->dest;
 	fl6.fl6_sport = t1->source;
+	if (fl6.flowi6_oif == 0)
+		fl6.flowi6_oif = oif;
 	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
 
 	/* Pass a socket to ip6_dst_lookup either it is for RST
@@ -833,6 +835,7 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 	int genhash;
 	struct sock *sk1 = NULL;
 #endif
+	int oif;
 
 	if (th->rst)
 		return;
@@ -876,7 +879,8 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
 			  (th->doff << 2);
 
-	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0, 0);
+	oif = sk ? sk->sk_bound_dev_if : 0;
+	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
 
 #ifdef CONFIG_TCP_MD5SIG
 release_sk1:
@@ -888,11 +892,11 @@ release_sk1:
 }
 
 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
-			    u32 win, u32 tsval, u32 tsecr,
+			    u32 win, u32 tsval, u32 tsecr, int oif,
 			    struct tcp_md5sig_key *key, u8 tclass,
 			    u32 label)
 {
-	tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass,
+	tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass,
 			     label);
 }
 
@@ -904,7 +908,7 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
 	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
 			tcp_time_stamp + tcptw->tw_ts_offset,
-			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
+			tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
 			tw->tw_tclass, (tw->tw_flowlabel << 12));
 
 	inet_twsk_put(tw);
@@ -914,7 +918,7 @@ static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
 				  struct request_sock *req)
 {
 	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1,
-			req->rcv_wnd, tcp_time_stamp, req->ts_recent,
+			req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if,
 			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
 			0, 0);
 }
-- 
1.7.12


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