[PATCH net-next 3/5] ipv6: Use multipath hash from flow info if available
From: Jakub Sitnicki <hidden>
Date: 2016-10-24 09:29:06
Also in:
lkml
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Allow our callers to influence the choice of ECMP link by honoring the hash passed together with the flow info. This will allow for special treatment of ICMP errors which we would like to route over the same link as the IP datagram that triggered the error. Signed-off-by: Jakub Sitnicki <redacted> --- net/ipv6/route.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0514b35..1184c2b 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c@@ -430,9 +430,11 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match, int strict) { struct rt6_info *sibling, *next_sibling; + unsigned int hash; int route_choosen; - route_choosen = get_hash_from_flowi6(fl6) % (match->rt6i_nsiblings + 1); + hash = fl6->mp_hash ? : get_hash_from_flowi6(fl6); + route_choosen = hash % (match->rt6i_nsiblings + 1); /* Don't change the route, if route_choosen == 0 * (siblings does not include ourself) */
--
2.7.4