[PATCH 22/29] netfilter: move table iteration out of netns exit paths

[Pablo Neira Ayuso]

From: Florian Westphal <f...@strlen.de>

We only need to iterate & remove in case of module removal;
for netns destruction all conntracks will be removed anyway.

Signed-off-by: Florian Westphal <f...@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/netfilter/nf_conntrack_proto.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/nf_conntrack_proto.c 
b/net/netfilter/nf_conntrack_proto.c
index b7d01f27d463..6a36623e897c 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -265,6 +265,8 @@ void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto 
*proto)
        mutex_unlock(&nf_ct_proto_mutex);
 
        synchronize_rcu();
+       /* Remove all contrack entries for this protocol */
+       nf_ct_iterate_destroy(kill_l3proto, proto);
 }
 EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister);
 
@@ -280,9 +282,6 @@ void nf_ct_l3proto_pernet_unregister(struct net *net,
         */
        if (proto->net_ns_put)
                proto->net_ns_put(net);
-
-       /* Remove all contrack entries for this protocol */
-       nf_ct_iterate_cleanup_net(net, kill_l3proto, proto, 0, 0);
 }
 EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister);
 
@@ -421,17 +420,23 @@ int nf_ct_l4proto_pernet_register_one(struct net *net,
 }
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one);
 
-void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
+static void __nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto 
*l4proto)
+
 {
        BUG_ON(l4proto->l3proto >= PF_MAX);
 
-       mutex_lock(&nf_ct_proto_mutex);
        BUG_ON(rcu_dereference_protected(
                        nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
                        lockdep_is_held(&nf_ct_proto_mutex)
                        ) != l4proto);
        rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
                           &nf_conntrack_l4proto_generic);
+}
+
+void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
+{
+       mutex_lock(&nf_ct_proto_mutex);
+       __nf_ct_l4proto_unregister_one(l4proto);
        mutex_unlock(&nf_ct_proto_mutex);
 
        synchronize_rcu();
@@ -448,9 +453,6 @@ void nf_ct_l4proto_pernet_unregister_one(struct net *net,
 
        pn->users--;
        nf_ct_l4proto_unregister_sysctl(net, pn, l4proto);
-
-       /* Remove all contrack entries for this protocol */
-       nf_ct_iterate_cleanup_net(net, kill_l4proto, l4proto, 0, 0);
 }
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister_one);
 
@@ -500,8 +502,14 @@ EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register);
 void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[],
                              unsigned int num_proto)
 {
+       mutex_lock(&nf_ct_proto_mutex);
        while (num_proto-- != 0)
-               nf_ct_l4proto_unregister_one(l4proto[num_proto]);
+               __nf_ct_l4proto_unregister_one(l4proto[num_proto]);
+       mutex_unlock(&nf_ct_proto_mutex);
+
+       synchronize_net();
+       /* Remove all contrack entries for this protocol */
+       nf_ct_iterate_destroy(kill_l4proto, l4proto);
 }
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister);
 
-- 
2.1.4