Commit 428604fb authored Mar 29, 2018 by Lorenzo Bianconi Committed by David S. Miller Mar 30, 2018

ipv6: do not set routes if disable_ipv6 has been enabled



Do not allow setting ipv6 routes from userspace if disable_ipv6 has been
enabled. The issue can be triggered using the following reproducer:

- sysctl net.ipv6.conf.all.disable_ipv6=1
- ip -6 route add a:b:c:d::/64 dev em1
- ip -6 route show
  a:b:c:d::/64 dev em1 metric 1024 pref medium

Fix it checking disable_ipv6 value in ip6_route_info_create routine

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d162190b

net/ipv6/route.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -2917,6 +2917,12 @@ static struct rt6_info ip6_route_info_create(struct fib6_config cfg,
		if (!dev)
		goto out;

		if (idev->cnf.disable_ipv6) {
		NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
		err = -EACCES;
		goto out;
		}

		if (!(dev->flags & IFF_UP)) {
		NL_SET_ERR_MSG(extack, "Nexthop device is not up");
		err = -ENETDOWN;