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netfilter pull request 24-11-07

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Merge tag 'nf-24-11-07' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf

Pablo Neira Ayuso says:

====================
Netfilter fix for net

The following series contains a Netfilter fix:

1) Wait for rcu grace period after netdevice removal is reported via event.

* tag 'nf-24-11-07' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
  netfilter: nf_tables: wait for rcu grace period on net_device removal
====================

Link: https://patch.msgid.link/20241107113212.116634-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-11-07 08:16:42 -08:00
commit 013d2c5c6b
2 changed files with 38 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/netfilter/nf_tables.h
View File

@ -1103,6 +1103,7 @@ struct nft_rule_blob {
* @name: name of the chain
* @udlen: user data length
* @udata: user data in the chain
* @rcu_head: rcu head for deferred release
* @blob_next: rule blob pointer to the next in the chain
*/
struct nft_chain {
@ -1120,6 +1121,7 @@ struct nft_chain {
char *name;
u16 udlen;
u8 *udata;
struct rcu_head rcu_head;
/* Only used during control plane commit phase: */
struct nft_rule_blob *blob_next;
@ -1263,6 +1265,7 @@ static inline void nft_use_inc_restore(u32 *use)
* @sets: sets in the table
* @objects: stateful objects in the table
* @flowtables: flow tables in the table
* @net: netnamespace this table belongs to
* @hgenerator: handle generator state
* @handle: table handle
* @use: number of chain references to this table
@ -1282,6 +1285,7 @@ struct nft_table {
struct list_head sets;
struct list_head objects;
struct list_head flowtables;
possible_net_t net;
u64 hgenerator;
u64 handle;
u32 use;

41
net/netfilter/nf_tables_api.c
View File

@ -1495,6 +1495,7 @@ static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
INIT_LIST_HEAD(&table->sets);
INIT_LIST_HEAD(&table->objects);
INIT_LIST_HEAD(&table->flowtables);
write_pnet(&table->net, net);
table->family = family;
table->flags = flags;
table->handle = ++nft_net->table_handle;
@ -11430,22 +11431,48 @@ int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
}
EXPORT_SYMBOL_GPL(nft_data_dump);
int __nft_release_basechain(struct nft_ctx *ctx)
static void __nft_release_basechain_now(struct nft_ctx *ctx)
{
struct nft_rule *rule, *nr;
if (WARN_ON(!nft_is_base_chain(ctx->chain)))
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
list_del(&rule->list);
nf_tables_rule_release(ctx, rule);
}
nf_tables_chain_destroy(ctx->chain);
}
static void nft_release_basechain_rcu(struct rcu_head *head)
{
struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head);
struct nft_ctx ctx = {
.family = chain->table->family,
.chain = chain,
.net = read_pnet(&chain->table->net),
};
__nft_release_basechain_now(&ctx);
put_net(ctx.net);
}
int __nft_release_basechain(struct nft_ctx *ctx)
{
struct nft_rule *rule;
if (WARN_ON_ONCE(!nft_is_base_chain(ctx->chain)))
return 0;
nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
list_del(&rule->list);
list_for_each_entry(rule, &ctx->chain->rules, list)
nft_use_dec(&ctx->chain->use);
nf_tables_rule_release(ctx, rule);
}
nft_chain_del(ctx->chain);
nft_use_dec(&ctx->table->use);
nf_tables_chain_destroy(ctx->chain);
if (maybe_get_net(ctx->net))
call_rcu(&ctx->chain->rcu_head, nft_release_basechain_rcu);
else
__nft_release_basechain_now(ctx);
return 0;
}