Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 14:11:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

ipv6: Use multipath hash from flow info if available

Browse Source 
Allow our callers to influence the choice of ECMP link by honoring the
hash passed together with the flow info. This allows for special
treatment of ICMP errors which we would like to route over the same path
as the IPv6 datagram that triggered the error.

Also go through rt6_multipath_hash(), in the usual case when we aren't
dealing with an ICMP error, so that there is one central place where
multipath hash is computed.

Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Sitnicki 2017-08-23 09:58:31 +02:00 committed by David S. Miller
parent 956b45318a
commit b673d6ccea
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/ipv6/route.c
View File

@ -452,7 +452,13 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
struct rt6_info *sibling, *next_sibling;
int route_choosen;
route_choosen = get_hash_from_flowi6(fl6) % (match->rt6i_nsiblings + 1);
/* We might have already computed the hash for ICMPv6 errors. In such
* case it will always be non-zero. Otherwise now is the time to do it.
*/
if (!fl6->mp_hash)
fl6->mp_hash = rt6_multipath_hash(fl6, NULL);
route_choosen = fl6->mp_hash % (match->rt6i_nsiblings + 1);
/* Don't change the route, if route_choosen == 0
* (siblings does not include ourself)
*/