[NETFILTER]: nf_conntrack: support for layer 3 protocol load on demand

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_core.c

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index c28840656451cd4de1fc460a6ee90fbeb63e3fcb..0ae281d9bfc3f16cda2b7e36c34b109145045d1a 100644 (file)
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -23,6 +23,8 @@
  * 26 Jan 2006: Harald Welte <laforge@netfilter.org>
  *     - restructure nf_conn (introduce nf_conn_help)
  *     - redesign 'features' how they were originally intended
+ * 26 Feb 2006: Pablo Neira Ayuso <pablo@eurodev.net>
+ *     - add support for L3 protocol module load on demand.
  *
  * Derived from net/ipv4/netfilter/ip_conntrack_core.c
  */
@@ -241,6 +243,35 @@ void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
        module_put(p->me);
 }
 
+int
+nf_ct_l3proto_try_module_get(unsigned short l3proto)
+{
+       int ret;
+       struct nf_conntrack_l3proto *p;
+
+retry: p = nf_ct_l3proto_find_get(l3proto);
+       if (p == &nf_conntrack_generic_l3proto) {
+               ret = request_module("nf_conntrack-%d", l3proto);
+               if (!ret)
+                       goto retry;
+
+               return -EPROTOTYPE;
+       }
+
+       return 0;
+}
+
+void nf_ct_l3proto_module_put(unsigned short l3proto)
+{
+       struct nf_conntrack_l3proto *p;
+
+       preempt_disable();
+       p = __nf_ct_l3proto_find(l3proto);
+       preempt_enable();
+
+       module_put(p->me);
+}
+
 static int nf_conntrack_hash_rnd_initted;
 static unsigned int nf_conntrack_hash_rnd;