[NETFILTER]: kill __ip_ct_expect_unlink_destroy

The following patch kills __ip_ct_expect_unlink_destroy and export
unlink_expect as ip_ct_unlink_expect. As it was discussed [1], the function
__ip_ct_expect_unlink_destroy is a bit confusing so better do the following
sequence: ip_ct_destroy_expect and ip_conntrack_expect_put.

[1] https://lists.netfilter.org/pipermail/netfilter-devel/2005-August/020794.html

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 17 insertions, 19 deletions

diff --git a/include/linux/netfilter_ipv4/ip_conntrack_core.h b/include/linux/netfilter_ipv4/ip_conntrack_core.h
index dc4d2a0575de..907d4f5ca5dc 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_core.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack_core.h
@@ -52,7 +52,7 @@ static inline int ip_conntrack_confirm(struct sk_buff **pskb)
         return ret;
 }
 
-extern void __ip_ct_expect_unlink_destroy(struct ip_conntrack_expect *exp);
+extern void ip_ct_unlink_expect(struct ip_conntrack_expect *exp);
 
 extern struct list_head *ip_conntrack_hash;
 extern struct list_head ip_conntrack_expect_list;
diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c
index babce304c619..19cba16e6e1e 100644
--- a/net/ipv4/netfilter/ip_conntrack_core.c
+++ b/net/ipv4/netfilter/ip_conntrack_core.c
@@ -197,7 +197,7 @@ ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
 
 
 /* ip_conntrack_expect helper functions */
-static void unlink_expect(struct ip_conntrack_expect *exp)
+void ip_ct_unlink_expect(struct ip_conntrack_expect *exp)
 {
         ASSERT_WRITE_LOCK(&ip_conntrack_lock);
         IP_NF_ASSERT(!timer_pending(&exp->timeout));
@@ -207,18 +207,12 @@ static void unlink_expect(struct ip_conntrack_expect *exp)
         ip_conntrack_expect_put(exp);
 }
 
-void __ip_ct_expect_unlink_destroy(struct ip_conntrack_expect *exp)
-{
-        unlink_expect(exp);
-        ip_conntrack_expect_put(exp);
-}
-
 static void expectation_timed_out(unsigned long ul_expect)
 {
         struct ip_conntrack_expect *exp = (void *)ul_expect;
 
         write_lock_bh(&ip_conntrack_lock);
-        unlink_expect(exp);
+        ip_ct_unlink_expect(exp);
         write_unlock_bh(&ip_conntrack_lock);
         ip_conntrack_expect_put(exp);
 }
@@ -269,7 +263,7 @@ find_expectation(const struct ip_conntrack_tuple *tuple)
                                 atomic_inc(&i->use);
                                 return i;
                         } else if (del_timer(&i->timeout)) {
-                                unlink_expect(i);
+                                ip_ct_unlink_expect(i);
                                 return i;
                         }
                 }
@@ -288,7 +282,7 @@ void ip_ct_remove_expectations(struct ip_conntrack *ct)
 
         list_for_each_entry_safe(i, tmp, &ip_conntrack_expect_list, list) {
                 if (i->master == ct && del_timer(&i->timeout)) {
-                        unlink_expect(i);
+                        ip_ct_unlink_expect(i);
                         ip_conntrack_expect_put(i);
                 }
         }
@@ -929,7 +923,7 @@ void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp)
         /* choose the the oldest expectation to evict */
         list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
                 if (expect_matches(i, exp) && del_timer(&i->timeout)) {
-                        unlink_expect(i);
+                        ip_ct_unlink_expect(i);
                         write_unlock_bh(&ip_conntrack_lock);
                         ip_conntrack_expect_put(i);
                         return;
@@ -986,7 +980,7 @@ static void evict_oldest_expect(struct ip_conntrack *master)
         list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
                 if (i->master == master) {
                         if (del_timer(&i->timeout)) {
-                                unlink_expect(i);
+                                ip_ct_unlink_expect(i);
                                 ip_conntrack_expect_put(i);
                         }
                         break;
@@ -1103,7 +1097,7 @@ void ip_conntrack_helper_unregister(struct ip_conntrack_helper *me)
         /* Get rid of expectations */
         list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list, list) {
                 if (exp->master->helper == me && del_timer(&exp->timeout)) {
-                        unlink_expect(exp);
+                        ip_ct_unlink_expect(exp);
                         ip_conntrack_expect_put(exp);
                 }
         }
diff --git a/net/ipv4/netfilter/ip_conntrack_netlink.c b/net/ipv4/netfilter/ip_conntrack_netlink.c
index 3dc3a7bab3b4..15aef3564742 100644
--- a/net/ipv4/netfilter/ip_conntrack_netlink.c
+++ b/net/ipv4/netfilter/ip_conntrack_netlink.c
@@ -1349,8 +1349,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
                                          list) {
                         if (exp->master->helper == h 
-                            && del_timer(&exp->timeout))
-                                __ip_ct_expect_unlink_destroy(exp);
+                            && del_timer(&exp->timeout)) {
+                                ip_ct_unlink_expect(exp);
+                                ip_conntrack_expect_put(exp);
+                        }
                 }
                 write_unlock(&ip_conntrack_lock);
         } else {
@@ -1358,8 +1360,10 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
                 write_lock_bh(&ip_conntrack_lock);
                 list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
                                          list) {
-                        if (del_timer(&exp->timeout))
-                                __ip_ct_expect_unlink_destroy(exp);
+                        if (del_timer(&exp->timeout)) {
+                                ip_ct_unlink_expect(exp);
+                                ip_conntrack_expect_put(exp);
+                        }
                 }
                 write_unlock_bh(&ip_conntrack_lock);
         }
diff --git a/net/ipv4/netfilter/ip_conntrack_standalone.c b/net/ipv4/netfilter/ip_conntrack_standalone.c
index ee5895afd0c3..ae3e3e655db5 100644
--- a/net/ipv4/netfilter/ip_conntrack_standalone.c
+++ b/net/ipv4/netfilter/ip_conntrack_standalone.c
@@ -998,7 +998,7 @@ EXPORT_SYMBOL(ip_conntrack_expect_related);
 EXPORT_SYMBOL(ip_conntrack_unexpect_related);
 EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
 EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
-EXPORT_SYMBOL_GPL(__ip_ct_expect_unlink_destroy);
+EXPORT_SYMBOL_GPL(ip_ct_unlink_expect);
 
 EXPORT_SYMBOL(ip_conntrack_tuple_taken);
 EXPORT_SYMBOL(ip_ct_gather_frags);