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netfilter: add struct nf_ct_hook and use it 

Move the nf_ct_destroy indirection to the struct nf_ct_hook.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-05-23 09:17:12 +02:00
parent cede24d1b2
commit 1f4b24397d
3 changed files with 19 additions and 11 deletions
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7
include/linux/netfilter.h
View File

@ -373,13 +373,18 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif
struct nf_conn;
enum ip_conntrack_info;
struct nf_ct_hook {
void (*destroy)(struct nf_conntrack *);
};
extern struct nf_ct_hook __rcu *nf_ct_hook;
struct nlattr;
struct nfnl_ct_hook {

14
net/netfilter/core.c
View File

@ -563,6 +563,9 @@ EXPORT_SYMBOL(skb_make_writable);
struct nfnl_ct_hook __rcu *nfnl_ct_hook __read_mostly;
EXPORT_SYMBOL_GPL(nfnl_ct_hook);
struct nf_ct_hook __rcu *nf_ct_hook __read_mostly;
EXPORT_SYMBOL_GPL(nf_ct_hook);
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
/* This does not belong here, but locally generated errors need it if connection
tracking in use: without this, connection may not be in hash table, and hence
@ -585,17 +588,14 @@ void nf_ct_attach(struct sk_buff *new, const struct sk_buff *skb)
}
EXPORT_SYMBOL(nf_ct_attach);
void (*nf_ct_destroy)(struct nf_conntrack *) __rcu __read_mostly;
EXPORT_SYMBOL(nf_ct_destroy);
void nf_conntrack_destroy(struct nf_conntrack *nfct)
{
void (*destroy)(struct nf_conntrack *);
struct nf_ct_hook *ct_hook;
rcu_read_lock();
destroy = rcu_dereference(nf_ct_destroy);
BUG_ON(destroy == NULL);
destroy(nfct);
ct_hook = rcu_dereference(nf_ct_hook);
BUG_ON(ct_hook == NULL);
ct_hook->destroy(nfct);
rcu_read_unlock();
}
EXPORT_SYMBOL(nf_conntrack_destroy);

9
net/netfilter/nf_conntrack_core.c
View File

@ -1813,8 +1813,7 @@ void nf_conntrack_cleanup_start(void)
void nf_conntrack_cleanup_end(void)
{
RCU_INIT_POINTER(nf_ct_destroy, NULL);
RCU_INIT_POINTER(nf_ct_hook, NULL);
cancel_delayed_work_sync(&conntrack_gc_work.dwork);
nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size);
@ -2131,11 +2130,15 @@ err_cachep:
return ret;
}
static struct nf_ct_hook nf_conntrack_hook = {
.destroy = destroy_conntrack,
};
void nf_conntrack_init_end(void)
{
/* For use by REJECT target */
RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach);
RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack);
RCU_INIT_POINTER(nf_ct_hook, &nf_conntrack_hook);
}
/*