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authorWANG Cong <xiyou.wangcong@gmail.com>2017-05-08 20:12:13 +0300
committerDavid S. Miller <davem@davemloft.net>2017-05-09 00:31:24 +0300
commit242d3a49a2a1a71d8eb9f953db1bcaa9d698ce00 (patch)
tree7565ac4897777e242dc18c26896cb972720aba35 /net
parent29cee56c0be46ad01e78af104a06223c65ee0c67 (diff)
downloadlinux-242d3a49a2a1a71d8eb9f953db1bcaa9d698ce00.tar.xz
ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf
For each netns (except init_net), we initialize its null entry in 3 places: 1) The template itself, as we use kmemdup() 2) Code around dst_init_metrics() in ip6_route_net_init() 3) ip6_route_dev_notify(), which is supposed to initialize it after loopback registers Unfortunately the last one still happens in a wrong order because we expect to initialize net->ipv6.ip6_null_entry->rt6i_idev to net->loopback_dev's idev, thus we have to do that after we add idev to loopback. However, this notifier has priority == 0 same as ipv6_dev_notf, and ipv6_dev_notf is registered after ip6_route_dev_notifier so it is called actually after ip6_route_dev_notifier. This is similar to commit 2f460933f58e ("ipv6: initialize route null entry in addrconf_init()") which fixes init_net. Fix it by picking a smaller priority for ip6_route_dev_notifier. Also, we have to release the refcnt accordingly when unregistering loopback_dev because device exit functions are called before subsys exit functions. Acked-by: David Ahern <dsahern@gmail.com> Tested-by: David Ahern <dsahern@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c1
-rw-r--r--net/ipv6/route.c13
2 files changed, 12 insertions, 2 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 77a4bd526d6e..8d297a79b568 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3548,6 +3548,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
*/
static struct notifier_block ipv6_dev_notf = {
.notifier_call = addrconf_notify,
+ .priority = ADDRCONF_NOTIFY_PRIORITY,
};
static void addrconf_type_change(struct net_device *dev, unsigned long event)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2f1136627dcb..dc61b0b5e64e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3709,7 +3709,10 @@ static int ip6_route_dev_notify(struct notifier_block *this,
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net *net = dev_net(dev);
- if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
+ if (!(dev->flags & IFF_LOOPBACK))
+ return NOTIFY_OK;
+
+ if (event == NETDEV_REGISTER) {
net->ipv6.ip6_null_entry->dst.dev = dev;
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -3718,6 +3721,12 @@ static int ip6_route_dev_notify(struct notifier_block *this,
net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
#endif
+ } else if (event == NETDEV_UNREGISTER) {
+ in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
+ in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev);
+#endif
}
return NOTIFY_OK;
@@ -4024,7 +4033,7 @@ static struct pernet_operations ip6_route_net_late_ops = {
static struct notifier_block ip6_route_dev_notifier = {
.notifier_call = ip6_route_dev_notify,
- .priority = 0,
+ .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
};
void __init ip6_route_init_special_entries(void)