1 files changed, 37 insertions, 8 deletions

diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 4b1a56bd074c..59e1a4cd4e8b 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -15,7 +15,6 @@
 #include <linux/skbuff.h>
 #include <linux/vmalloc.h>
 #include <linux/stddef.h>
-#include <linux/slab.h>
 #include <linux/random.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -65,7 +64,7 @@ __nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
 }
 
 struct nf_conntrack_helper *
-__nf_conntrack_helper_find_byname(const char *name)
+__nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum)
 {
 	struct nf_conntrack_helper *h;
 	struct hlist_node *n;
@@ -73,13 +72,34 @@ __nf_conntrack_helper_find_byname(const char *name)
 
 	for (i = 0; i < nf_ct_helper_hsize; i++) {
 		hlist_for_each_entry_rcu(h, n, &nf_ct_helper_hash[i], hnode) {
-			if (!strcmp(h->name, name))
+			if (!strcmp(h->name, name) &&
+			    h->tuple.src.l3num == l3num &&
+			    h->tuple.dst.protonum == protonum)
 				return h;
 		}
 	}
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find_byname);
+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)
 {
@@ -94,13 +114,22 @@ struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp)
 }
 EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add);
 
-int __nf_ct_try_assign_helper(struct nf_conn *ct, gfp_t flags)
+int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
+			      gfp_t flags)
 {
+	struct nf_conntrack_helper *helper = NULL;
+	struct nf_conn_help *help;
 	int ret = 0;
-	struct nf_conntrack_helper *helper;
-	struct nf_conn_help *help = nfct_help(ct);
 
-	helper = __nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+	if (tmpl != NULL) {
+		help = nfct_help(tmpl);
+		if (help != NULL)
+			helper = help->helper;
+	}
+
+	help = nfct_help(ct);
+	if (helper == NULL)
+		helper = __nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 	if (helper == NULL) {
 		if (help)
 			rcu_assign_pointer(help->helper, NULL);