Commit e2948e5a authored Aug 19, 2018 by Haishuang Yan Committed by David S. Miller Aug 19, 2018

ip6_vti: fix creating fallback tunnel device for vti6



When set fb_tunnels_only_for_init_net to 1, don't create fallback tunnel
device for vti6 when a new namespace is created.

Tested:
[root@builder2 ~]# modprobe ip6_tunnel
[root@builder2 ~]# modprobe ip6_vti
[root@builder2 ~]# echo 1 > /proc/sys/net/core/fb_tunnels_only_for_init_net
[root@builder2 ~]# unshare -n
[root@builder2 ~]# ip link
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group
default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent cd1aa9c2

net/ipv6/ip6_vti.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1106,6 +1106,8 @@ static int __net_init vti6_init_net(struct net *net)
		ip6n->tnls[0] = ip6n->tnls_wc;
		ip6n->tnls[1] = ip6n->tnls_r_l;

		if (!net_has_fallback_tunnels(net))
		return 0;
		err = -ENOMEM;
		ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
		NET_NAME_UNKNOWN, vti6_dev_setup);

Admin message