netfilter: xtables: add CT target
Add a new target for the raw table, which can be used to specify conntrack
parameters for specific connections, f.i. the conntrack helper.
The target attaches a "template" connection tracking entry to the skb, which
is used by the conntrack core when initializing a new conntrack.
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 8144b0d..a74a576 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -83,6 +83,25 @@
}
EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find);
+struct nf_conntrack_helper *
+nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum)
+{
+ struct nf_conntrack_helper *h;
+
+ h = __nf_conntrack_helper_find(name, l3num, protonum);
+#ifdef CONFIG_MODULES
+ if (h == NULL) {
+ if (request_module("nfct-helper-%s", name) == 0)
+ h = __nf_conntrack_helper_find(name, l3num, protonum);
+ }
+#endif
+ if (h != NULL && !try_module_get(h->me))
+ h = NULL;
+
+ return h;
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_helper_try_module_get);
+
struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp)
{
struct nf_conn_help *help;