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netfilter: move table iteration out of netns exit paths 

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 <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2017-05-30 11:31:06 +02:00 committed by Pablo Neira Ayuso
parent 202f59afd4
commit 2c41f33c1b
1 changed files with 17 additions and 9 deletions
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26
net/netfilter/nf_conntrack_proto.c
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@ -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 @@ out:
}
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);