net: ipv6: check route protocol when deleting routes

The protocol field is checked when deleting IPv4 routes, but ignored for
IPv6, which causes problems with routing daemons accidentally deleting
externally set routes (observed by multiple bird6 users).

This can be verified using `ip -6 route del <prefix> proto something`.

Signed-off-by: Mantas Mikulėnas <grawity@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name net-ipv6-check-route-protocol-when-deleting-routes.patch

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bff4460f17be107c7fd713ff3ea7b43e1e2aa8ee..8d6c09f082c233113ea8ce15bc4b2a06d3205e64 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2166,6 +2166,8 @@ static int ip6_route_del(struct fib6_config *cfg)
                                continue;
                        if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
                                continue;
+                       if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
+                               continue;
                        dst_hold(&rt->dst);
                        read_unlock_bh(&table->tb6_lock);