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netfilter: nf_tables: Introduce functions freeing nft_hook objects 

Pointless wrappers around kfree() for now, prep work for an embedded
list of nf_hook_ops.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2025-05-21 22:44:22 +02:00 committed by Pablo Neira Ayuso
parent 7e5c6aa67e
commit 75e20bcdce
1 changed files with 24 additions and 14 deletions
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38
net/netfilter/nf_tables_api.c
View File

@ -323,6 +323,16 @@ static int nft_netdev_register_hooks(struct net *net,
return err;
}
static void nft_netdev_hook_free(struct nft_hook *hook)
{
kfree(hook);
}
static void nft_netdev_hook_free_rcu(struct nft_hook *hook)
{
kfree_rcu(hook, rcu);
}
static void nft_netdev_unregister_hooks(struct net *net,
struct list_head *hook_list,
bool release_netdev)
@ -333,7 +343,7 @@ static void nft_netdev_unregister_hooks(struct net *net,
nf_unregister_net_hook(net, &hook->ops);
if (release_netdev) {
list_del(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
}
}
@ -2253,7 +2263,7 @@ void nf_tables_chain_destroy(struct nft_chain *chain)
list_for_each_entry_safe(hook, next,
&basechain->hook_list, list) {
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
}
module_put(basechain->type->owner);
@ -2345,7 +2355,7 @@ static int nf_tables_parse_netdev_hooks(struct net *net,
}
if (nft_hook_list_find(hook_list, hook)) {
NL_SET_BAD_ATTR(extack, tmp);
kfree(hook);
nft_netdev_hook_free(hook);
err = -EEXIST;
goto err_hook;
}
@ -2363,7 +2373,7 @@ static int nf_tables_parse_netdev_hooks(struct net *net,
err_hook:
list_for_each_entry_safe(hook, next, hook_list, list) {
list_del(&hook->list);
kfree(hook);
nft_netdev_hook_free(hook);
}
return err;
}
@ -2506,7 +2516,7 @@ static void nft_chain_release_hook(struct nft_chain_hook *hook)
list_for_each_entry_safe(h, next, &hook->list, list) {
list_del(&h->list);
kfree(h);
nft_netdev_hook_free(h);
}
module_put(hook->type->owner);
}
@ -2795,7 +2805,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (nft_hook_list_find(&basechain->hook_list, h)) {
list_del(&h->list);
kfree(h);
nft_netdev_hook_free(h);
}
}
} else {
@ -2916,7 +2926,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (unregister)
nf_unregister_net_hook(ctx->net, &h->ops);
list_del(&h->list);
kfree_rcu(h, rcu);
nft_netdev_hook_free_rcu(h);
}
module_put(hook.type->owner);
}
@ -8907,7 +8917,7 @@ static void __nft_unregister_flowtable_net_hooks(struct net *net,
FLOW_BLOCK_UNBIND);
if (release_netdev) {
list_del(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
}
}
@ -8965,7 +8975,7 @@ static int nft_register_flowtable_net_hooks(struct net *net,
nft_unregister_flowtable_hook(net, flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
return err;
@ -8977,7 +8987,7 @@ static void nft_hooks_destroy(struct list_head *hook_list)
list_for_each_entry_safe(hook, next, hook_list, list) {
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
}
@ -9001,7 +9011,7 @@ static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
if (nft_hook_list_find(&flowtable->hook_list, hook)) {
list_del(&hook->list);
kfree(hook);
nft_netdev_hook_free(hook);
}
}
@ -9048,7 +9058,7 @@ static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
if (unregister)
nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
return err;
@ -9194,7 +9204,7 @@ static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook
list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
list_del(&this->list);
kfree(this);
nft_netdev_hook_free(this);
}
}
@ -9557,7 +9567,7 @@ static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
flowtable->data.type->free(&flowtable->data);
list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
list_del_rcu(&hook->list);
kfree_rcu(hook, rcu);
nft_netdev_hook_free_rcu(hook);
}
kfree(flowtable->name);
module_put(flowtable->data.type->owner);