linux-kernel - [PATCH 3.12 45/86] net: ipv6: check route protocol when deleting routes

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Date:   Thu,  4 May 2017 11:04:10 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Mantas M <grawity@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Ben Hutchings <ben@...adent.org.uk>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 45/86] net: ipv6: check route protocol when deleting routes

From: Mantas M <grawity@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit c2ed1880fd61a998e3ce40254a99a2ad000f1a7d upstream.

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@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/ipv6/route.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e19817a090c7..a4238c684a91 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1754,6 +1754,8 @@ 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);
 
-- 
2.12.2