netfilter: conntrack: move helper destruction to nf_ct_helper_destroy()

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>

diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
index ee2a4b3..1b70680 100644 (file)
--- a/include/net/netfilter/nf_conntrack_helper.h
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -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);

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index bcacbb5..14235b1 100644 (file)
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -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. */

diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 0fa5a42..65c2a7b 100644 (file)
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -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);