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vti6: flush x-netns xfrm cache when vti interface is removed

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This is the same fix than commit a5d0dc810a ("vti: flush x-netns xfrm
cache when vti interface is removed")

This patch fixes a refcnt problem when a x-netns vti6 interface is removed:
unregister_netdevice: waiting for vti6_test to become free. Usage count = 1

Here is a script to reproduce the problem:

ip link set dev ntfp2 up
ip addr add dev ntfp2 2001::1/64
ip link add vti6_test type vti6 local 2001::1 remote 2001::2 key 1
ip netns add secure
ip link set vti6_test netns secure
ip netns exec secure ip link set vti6_test up
ip netns exec secure ip link s lo up
ip netns exec secure ip addr add dev vti6_test 2003::1/64
ip -6 xfrm policy add dir out tmpl src 2001::1 dst 2001::2 proto esp \
	   mode tunnel mark 1
ip -6 xfrm policy add dir in tmpl src 2001::2 dst 2001::1 proto esp \
	   mode tunnel mark 1
ip xfrm state add src 2001::1 dst 2001::2 proto esp spi 1 mode tunnel \
	   enc des3_ede 0x112233445566778811223344556677881122334455667788 mark 1
ip xfrm state add src 2001::2 dst 2001::1 proto esp spi 1 mode tunnel \
	   enc des3_ede 0x112233445566778811223344556677881122334455667788 mark 1
ip netns exec secure  ping6 -c 4 2003::2
ip netns del secure

CC: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Nicolas Dichtel 2016-09-30 11:11:07 +02:00 committed by Steffen Klassert
parent d24cd733ba
commit 7f92083eb5
1 changed files with 31 additions and 0 deletions
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31
net/ipv6/ip6_vti.c
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@ -1138,6 +1138,33 @@ static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
.priority = 100,
};
static bool is_vti6_tunnel(const struct net_device *dev)
{
return dev->netdev_ops == &vti6_netdev_ops;
}
static int vti6_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct ip6_tnl *t = netdev_priv(dev);
if (!is_vti6_tunnel(dev))
return NOTIFY_DONE;
switch (event) {
case NETDEV_DOWN:
if (!net_eq(t->net, dev_net(dev)))
xfrm_garbage_collect(t->net);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block vti6_notifier_block __read_mostly = {
.notifier_call = vti6_device_event,
};
/**
* vti6_tunnel_init - register protocol and reserve needed resources
*
@ -1148,6 +1175,8 @@ static int __init vti6_tunnel_init(void)
const char *msg;
int err;
register_netdevice_notifier(&vti6_notifier_block);
msg = "tunnel device";
err = register_pernet_device(&vti6_net_ops);
if (err < 0)
@ -1180,6 +1209,7 @@ xfrm_proto_ah_failed:
xfrm_proto_esp_failed:
unregister_pernet_device(&vti6_net_ops);
pernet_dev_failed:
unregister_netdevice_notifier(&vti6_notifier_block);
pr_err("vti6 init: failed to register %s\n", msg);
return err;
}
@ -1194,6 +1224,7 @@ static void __exit vti6_tunnel_cleanup(void)
xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
unregister_pernet_device(&vti6_net_ops);
unregister_netdevice_notifier(&vti6_notifier_block);
}
module_init(vti6_tunnel_init);