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netfilter: nf_tables: add nft_unregister_flowtable_hook()

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Unbind flowtable callback if hook is unregistered.

This patch is implicitly fixing the error path of
nf_tables_newflowtable() and nft_flowtable_event().

Fixes: 8bb69f3b29 ("netfilter: nf_tables: add flowtable offload control plane")
Reported-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-11-15 11:36:35 +01:00
parent d7c03a9f5c
commit ff4bf2f42a
1 changed files with 14 additions and 10 deletions
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24
net/netfilter/nf_tables_api.c
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@ -5975,16 +5975,22 @@ nft_flowtable_type_get(struct net *net, u8 family)
return ERR_PTR(-ENOENT);
}
static void nft_unregister_flowtable_hook(struct net *net,
struct nft_flowtable *flowtable,
struct nft_hook *hook)
{
nf_unregister_net_hook(net, &hook->ops);
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
FLOW_BLOCK_UNBIND);
}
static void nft_unregister_flowtable_net_hooks(struct net *net,
struct nft_flowtable *flowtable)
{
struct nft_hook *hook;
list_for_each_entry(hook, &flowtable->hook_list, list) {
nf_unregister_net_hook(net, &hook->ops);
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
FLOW_BLOCK_UNBIND);
}
list_for_each_entry(hook, &flowtable->hook_list, list)
nft_unregister_flowtable_hook(net, flowtable, hook);
}
static int nft_register_flowtable_net_hooks(struct net *net,
@ -6030,9 +6036,7 @@ err_unregister_net_hooks:
if (i-- <= 0)
break;
nf_unregister_net_hook(net, &hook->ops);
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
FLOW_BLOCK_UNBIND);
nft_unregister_flowtable_hook(net, flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
}
@ -6139,7 +6143,7 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
return 0;
err5:
list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
nf_unregister_net_hook(net, &hook->ops);
nft_unregister_flowtable_hook(net, flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
}
@ -6484,7 +6488,7 @@ static void nft_flowtable_event(unsigned long event, struct net_device *dev,
if (hook->ops.dev != dev)
continue;
nf_unregister_net_hook(dev_net(dev), &hook->ops);
nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
break;