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>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2413a0637d99..890acace01d0 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2174,6 +2174,8 @@ 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);