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zebra: fix detection of duplicate kernel routes (ECMP version)

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Fixes the following bug:
% ip route add 50.0.0.0/8 nexthop via 10.0.1.2 nexthop via 10.0.2.2
% ip route replace 50.0.0.0/8 nexthop via 10.0.1.3 nexthop via 10.0.2.3
% ip route replace 50.0.0.0/8 nexthop via 10.0.1.4 nexthop via 10.0.2.4
%
% vtysh -c "show ip route"
[snip]
K * 50.0.0.0/8 [0/0] via 10.0.1.4, rt1-eth1, 00:00:00
  *                  via 10.0.2.4, rt1-eth2, 00:00:00
K * 50.0.0.0/8 [0/0] via 10.0.1.3, rt1-eth1, 00:00:10
  *                  via 10.0.2.3, rt1-eth2, 00:00:10
K>* 50.0.0.0/8 [0/0] via 10.0.1.2, rt1-eth1, 00:00:24
  *                  via 10.0.2.2, rt1-eth2, 00:00:24

Commit a3d18ce6 fixed a similar problem for single-path routes.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2017-09-20 19:04:26 -03:00
parent e4e451ce15
commit 844b3a8748
1 changed files with 5 additions and 1 deletions
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6
zebra/zebra_rib.c
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@ -2260,7 +2260,11 @@ int rib_add_multipath(afi_t afi, safi_t safi, struct prefix *p,
if (same->type == ZEBRA_ROUTE_KERNEL &&
same->metric != re->metric)
continue;
if (!RIB_SYSTEM_ROUTE(same))
/*
* We should allow duplicate connected routes because of
* IPv6 link-local routes and unnumbered interfaces on Linux.
*/
if (same->type != ZEBRA_ROUTE_CONNECT)
break;
}