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authorMichal Kubeček <mkubecek@suse.cz>2015-05-18 20:53:55 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-20 12:02:25 -0400
commit35f1b4e96b9258a3668872b1139c51e5a23eb876 (patch)
tree89234a81b657a4ad1e2ed07ab98736b8ee979e69 /net
parent892bd6291ac122e3cdb354ef39567c9127768916 (diff)
downloadkernel-35f1b4e96b9258a3668872b1139c51e5a23eb876.tar.gz
ipv6: do not delete previously existing ECMP routes if add fails
If adding a nexthop of an IPv6 multipath route fails, comment in ip6_route_multipath() says we are going to delete all nexthops already added. However, current implementation deletes even the routes it hasn't even tried to add yet. For example, running ip route add 1234:5678::/64 \ nexthop via fe80::aa dev dummy1 \ nexthop via fe80::bb dev dummy1 \ nexthop via fe80::cc dev dummy1 twice results in removing all routes first command added. Limit the second (delete) run to nexthops that succeeded in the first (add) run. Fixes: 51ebd3181572 ("ipv6: add support of equal cost multipath (ECMP)") Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/route.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d3588885f097..3821a3517478 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2504,9 +2504,9 @@ static int ip6_route_multipath(struct fib6_config *cfg, int add)
int attrlen;
int err = 0, last_err = 0;
+ remaining = cfg->fc_mp_len;
beginning:
rtnh = (struct rtnexthop *)cfg->fc_mp;
- remaining = cfg->fc_mp_len;
/* Parse a Multipath Entry */
while (rtnh_ok(rtnh, remaining)) {
@@ -2536,6 +2536,7 @@ beginning:
* next hops that have been already added.
*/
add = 0;
+ remaining = cfg->fc_mp_len - remaining;
goto beginning;
}
}