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netfilter: nf_tables: destroy basechain and rules on netdevice removal

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If the netdevice is destroyed, the resources that are attached should
be released too as they belong to the device that is now gone.

Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2015-12-15 19:40:49 +01:00
parent df05ef874b
commit 5ebe0b0eec
3 changed files with 44 additions and 37 deletions
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5
include/net/netfilter/nf_tables.h
View File

@ -821,10 +821,7 @@ static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chai
return container_of(chain, struct nft_base_chain, chain);
}
int nft_register_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops);
void nft_unregister_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops);
int __nft_release_basechain(struct nft_ctx *ctx);
unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);

31
net/netfilter/nf_tables_api.c
View File

@ -131,8 +131,8 @@ static void nft_trans_destroy(struct nft_trans *trans)
kfree(trans);
}
int nft_register_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops)
static int nft_register_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops)
{
struct net *net = read_pnet(&basechain->pnet);
@ -141,10 +141,9 @@ int nft_register_basechain(struct nft_base_chain *basechain,
return nf_register_net_hooks(net, basechain->ops, hook_nops);
}
EXPORT_SYMBOL_GPL(nft_register_basechain);
void nft_unregister_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops)
static void nft_unregister_basechain(struct nft_base_chain *basechain,
unsigned int hook_nops)
{
struct net *net = read_pnet(&basechain->pnet);
@ -153,7 +152,6 @@ void nft_unregister_basechain(struct nft_base_chain *basechain,
nf_unregister_net_hooks(net, basechain->ops, hook_nops);
}
EXPORT_SYMBOL_GPL(nft_unregister_basechain);
static int nf_tables_register_hooks(const struct nft_table *table,
struct nft_chain *chain,
@ -4590,6 +4588,27 @@ static int __net_init nf_tables_init_net(struct net *net)
return 0;
}
int __nft_release_basechain(struct nft_ctx *ctx)
{
struct nft_rule *rule, *nr;
BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
ctx->afi->nops);
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
list_del(&rule->list);
ctx->chain->use--;
nf_tables_rule_destroy(ctx, rule);
}
list_del(&ctx->chain->list);
ctx->table->use--;
nf_tables_chain_destroy(ctx->chain);
return 0;
}
EXPORT_SYMBOL_GPL(__nft_release_basechain);
/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
{

45
net/netfilter/nf_tables_netdev.c
View File

@ -156,35 +156,17 @@ static const struct nf_chain_type nft_filter_chain_netdev = {
.hook_mask = (1 << NF_NETDEV_INGRESS),
};
static void nft_netdev_event(unsigned long event, struct nft_af_info *afi,
struct net_device *dev, struct nft_table *table,
struct nft_base_chain *basechain)
static void nft_netdev_event(unsigned long event, struct net_device *dev,
struct nft_ctx *ctx)
{
struct nft_base_chain *basechain = nft_base_chain(ctx->chain);
switch (event) {
case NETDEV_REGISTER:
if (strcmp(basechain->dev_name, dev->name) != 0)
return;
BUG_ON(!(basechain->flags & NFT_BASECHAIN_DISABLED));
dev_hold(dev);
basechain->ops[0].dev = dev;
basechain->flags &= ~NFT_BASECHAIN_DISABLED;
if (!(table->flags & NFT_TABLE_F_DORMANT))
nft_register_basechain(basechain, afi->nops);
break;
case NETDEV_UNREGISTER:
if (strcmp(basechain->dev_name, dev->name) != 0)
return;
BUG_ON(basechain->flags & NFT_BASECHAIN_DISABLED);
if (!(table->flags & NFT_TABLE_F_DORMANT))
nft_unregister_basechain(basechain, afi->nops);
dev_put(basechain->ops[0].dev);
basechain->ops[0].dev = NULL;
basechain->flags |= NFT_BASECHAIN_DISABLED;
__nft_release_basechain(ctx);
break;
case NETDEV_CHANGENAME:
if (dev->ifindex != basechain->ops[0].dev->ifindex)
@ -201,20 +183,29 @@ static int nf_tables_netdev_event(struct notifier_block *this,
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct nft_af_info *afi;
struct nft_table *table;
struct nft_chain *chain;
struct nft_chain *chain, *nr;
struct nft_ctx ctx = {
.net = dev_net(dev),
};
if (event != NETDEV_UNREGISTER &&
event != NETDEV_CHANGENAME)
return NOTIFY_DONE;
nfnl_lock(NFNL_SUBSYS_NFTABLES);
list_for_each_entry(afi, &dev_net(dev)->nft.af_info, list) {
ctx.afi = afi;
if (afi->family != NFPROTO_NETDEV)
continue;
list_for_each_entry(table, &afi->tables, list) {
list_for_each_entry(chain, &table->chains, list) {
ctx.table = table;
list_for_each_entry_safe(chain, nr, &table->chains, list) {
if (!(chain->flags & NFT_BASE_CHAIN))
continue;
nft_netdev_event(event, afi, dev, table,
nft_base_chain(chain));
ctx.chain = chain;
nft_netdev_event(event, dev, &ctx);
}
}
}