struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX] __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_l3protos);
#ifdef CONFIG_SYSCTL
static DEFINE_MUTEX(nf_ct_proto_sysctl_mutex);
if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
return &nf_conntrack_l4proto_generic;
- return nf_ct_protos[l3proto][l4proto];
+ return rcu_dereference(nf_ct_protos[l3proto][l4proto]);
}
+EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find);
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
{
struct nf_conntrack_l4proto *p;
- preempt_disable();
+ rcu_read_lock();
p = __nf_ct_l4proto_find(l3proto, l4proto);
if (!try_module_get(p->me))
p = &nf_conntrack_l4proto_generic;
- preempt_enable();
+ rcu_read_unlock();
return p;
}
+EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);
void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p)
{
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l4proto_put);
struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto)
{
struct nf_conntrack_l3proto *p;
- preempt_disable();
+ rcu_read_lock();
p = __nf_ct_l3proto_find(l3proto);
if (!try_module_get(p->me))
p = &nf_conntrack_l3proto_generic;
- preempt_enable();
+ rcu_read_unlock();
return p;
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get);
void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
{
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_put);
int
nf_ct_l3proto_try_module_get(unsigned short l3proto)
return 0;
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get);
void nf_ct_l3proto_module_put(unsigned short l3proto)
{
struct nf_conntrack_l3proto *p;
- preempt_disable();
+ /* rcu_read_lock not necessary since the caller holds a reference */
p = __nf_ct_l3proto_find(l3proto);
- preempt_enable();
-
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put);
static int kill_l3proto(struct nf_conn *i, void *data)
{
ret = -EBUSY;
goto out_unlock;
}
- nf_ct_l3protos[proto->l3proto] = proto;
+ rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
write_unlock_bh(&nf_conntrack_lock);
ret = nf_ct_l3proto_register_sysctl(proto);
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
-int nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
+void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
{
- int ret = 0;
-
- if (proto->l3proto >= AF_MAX) {
- ret = -EBUSY;
- goto out;
- }
+ BUG_ON(proto->l3proto >= AF_MAX);
write_lock_bh(&nf_conntrack_lock);
- if (nf_ct_l3protos[proto->l3proto] != proto) {
- write_unlock_bh(&nf_conntrack_lock);
- ret = -EBUSY;
- goto out;
- }
-
- nf_ct_l3protos[proto->l3proto] = &nf_conntrack_l3proto_generic;
+ BUG_ON(nf_ct_l3protos[proto->l3proto] != proto);
+ rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
+ &nf_conntrack_l3proto_generic);
write_unlock_bh(&nf_conntrack_lock);
+ synchronize_rcu();
nf_ct_l3proto_unregister_sysctl(proto);
- /* Somebody could be still looking at the proto in bh. */
- synchronize_net();
-
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_l3proto, proto);
-
-out:
- return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto)
{
goto retry;
}
- nf_ct_protos[l4proto->l3proto][l4proto->l4proto] = l4proto;
+ rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto);
write_unlock_bh(&nf_conntrack_lock);
ret = nf_ct_l4proto_register_sysctl(l4proto);
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register);
-int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
+void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
{
- int ret = 0;
-
- if (l4proto->l3proto >= PF_MAX) {
- ret = -EBUSY;
- goto out;
- }
+ BUG_ON(l4proto->l3proto >= PF_MAX);
if (l4proto == &nf_conntrack_l4proto_generic) {
nf_ct_l4proto_unregister_sysctl(l4proto);
- goto out;
+ return;
}
write_lock_bh(&nf_conntrack_lock);
- if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto]
- != l4proto) {
- write_unlock_bh(&nf_conntrack_lock);
- ret = -EBUSY;
- goto out;
- }
- nf_ct_protos[l4proto->l3proto][l4proto->l4proto]
- = &nf_conntrack_l4proto_generic;
+ BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto);
+ rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
+ &nf_conntrack_l4proto_generic);
write_unlock_bh(&nf_conntrack_lock);
+ synchronize_rcu();
nf_ct_l4proto_unregister_sysctl(l4proto);
- /* Somebody could be still looking at the proto in bh. */
- synchronize_net();
-
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_l4proto, l4proto);
-
-out:
- return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);