linux-kernel - [PATCH] sctp: set the value of flowi6_oif to sk_bound_dev_if to make sctp_v6_get

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Date:   Thu,  6 Jul 2017 15:00:09 +0800
From:   Zheng Li <lizheng043@...il.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        vyasevich@...il.com, nhorman@...driver.com,
        linux-sctp@...r.kernel.org, davem@...emloft.net, jmorris@...ei.org
Cc:     james.z.li@...csson.com, allen.y.zhao@...csson.com,
        feng.qiu@...csson.com
Subject: [PATCH] sctp: set the value of flowi6_oif to sk_bound_dev_if to make sctp_v6_get_dst to find the correct route entry.

From: Zheng Li <james.z.li@...csson.com>

if there are several same route entries with different outgoing net device,
application's socket specifies the oif through setsockopt with
SO_BINDTODEVICE, sctpv6 should choose the route entry whose outgoing net
device is the oif which was specified by socket, set the value of
flowi6_oif to sk->sk_bound_dev_if to make sctp_v6_get_dst to find the
correct route entry.

Signed-off-by: Zheng Li <james.z.li@...csson.com>
---
 net/sctp/ipv6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index f5b45b8..2a186b20 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -252,6 +252,8 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 	fl6->flowi6_proto = IPPROTO_SCTP;
 	if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 		fl6->flowi6_oif = daddr->v6.sin6_scope_id;
+	else if (asoc)
+		fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
 
 	pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
 
-- 
2.7.4