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netfilter: conntrack: move helper destruction to nf_ct_helper_destroy()

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This patch moves the helper destruction to a function that lives
in nf_conntrack_helper.c. This new function is used in the patch
to add ctnetlink reliable event delivery.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Pablo Neira Ayuso 2009-06-13 12:28:22 +02:00 committed by Patrick McHardy
parent a0891aa6a6
commit 9858a3ae1d
3 changed files with 17 additions and 10 deletions
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2
include/net/netfilter/nf_conntrack_helper.h
View File

@ -50,6 +50,8 @@ extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
extern int __nf_ct_try_assign_helper(struct nf_conn *ct, gfp_t flags);
extern void nf_ct_helper_destroy(struct nf_conn *ct);
static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
{
return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);

11
net/netfilter/nf_conntrack_core.c
View File

@ -224,17 +224,8 @@ static void death_by_timeout(unsigned long ul_conntrack)
{
struct nf_conn *ct = (void *)ul_conntrack;
struct net *net = nf_ct_net(ct);
struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_helper *helper;
if (help) {
rcu_read_lock();
helper = rcu_dereference(help->helper);
if (helper && helper->destroy)
helper->destroy(ct);
rcu_read_unlock();
}
nf_ct_helper_destroy(ct);
spin_lock_bh(&nf_conntrack_lock);
/* Inside lock so preempt is disabled on module removal path.
* Otherwise we can get spurious warnings. */

14
net/netfilter/nf_conntrack_helper.c
View File

@ -136,6 +136,20 @@ static inline int unhelp(struct nf_conntrack_tuple_hash *i,
return 0;
}
void nf_ct_helper_destroy(struct nf_conn *ct)
{
struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_helper *helper;
if (help) {
rcu_read_lock();
helper = rcu_dereference(help->helper);
if (helper && helper->destroy)
helper->destroy(ct);
rcu_read_unlock();
}
}
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
{
unsigned int h = helper_hash(&me->tuple);