diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h
index 6d14b36..4782b15 100644
--- a/include/net/netfilter/nf_conntrack_l3proto.h
+++ b/include/net/netfilter/nf_conntrack_l3proto.h
@@ -76,17 +76,17 @@ struct nf_conntrack_l3proto {
 #ifdef CONFIG_SYSCTL
 /* Protocol pernet registration. */
 int nf_ct_l3proto_pernet_register(struct net *net,
-				  struct nf_conntrack_l3proto *proto);
+				  const struct nf_conntrack_l3proto *proto);
 #else
 static inline int nf_ct_l3proto_pernet_register(struct net *n,
-						struct nf_conntrack_l3proto *p)
+					const struct nf_conntrack_l3proto *p)
 {
 	return 0;
 }
 #endif
 
 void nf_ct_l3proto_pernet_unregister(struct net *net,
-				     struct nf_conntrack_l3proto *proto);
+				     const struct nf_conntrack_l3proto *proto);
 
 /* Protocol global registration. */
 int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto);
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 7032e04..c86e946 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -125,23 +125,23 @@ struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto,
 
 struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto,
 						    u_int8_t l4proto);
-void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
+void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p);
 
 /* Protocol pernet registration. */
 int nf_ct_l4proto_pernet_register_one(struct net *net,
-				      struct nf_conntrack_l4proto *proto);
+				const struct nf_conntrack_l4proto *proto);
 void nf_ct_l4proto_pernet_unregister_one(struct net *net,
-					 struct nf_conntrack_l4proto *proto);
+				const struct nf_conntrack_l4proto *proto);
 int nf_ct_l4proto_pernet_register(struct net *net,
-				  struct nf_conntrack_l4proto *proto[],
+				  struct nf_conntrack_l4proto * const proto[],
 				  unsigned int num_proto);
 void nf_ct_l4proto_pernet_unregister(struct net *net,
-				     struct nf_conntrack_l4proto *proto[],
-				     unsigned int num_proto);
+				struct nf_conntrack_l4proto * const proto[],
+				unsigned int num_proto);
 
 /* Protocol global registration. */
 int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *proto);
-void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *proto);
+void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *proto);
 int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto[],
 			   unsigned int num_proto);
 void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto[],
diff --git a/include/net/netfilter/nf_conntrack_timeout.h b/include/net/netfilter/nf_conntrack_timeout.h
index d40b893..b222957 100644
--- a/include/net/netfilter/nf_conntrack_timeout.h
+++ b/include/net/netfilter/nf_conntrack_timeout.h
@@ -68,7 +68,7 @@ struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
 
 static inline unsigned int *
 nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
-		     struct nf_conntrack_l4proto *l4proto)
+		     const struct nf_conntrack_l4proto *l4proto)
 {
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	struct nf_conn_timeout *timeout_ext;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 51390fe..ed4e04e 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1183,8 +1183,8 @@ void nf_conntrack_free(struct nf_conn *ct)
 static noinline struct nf_conntrack_tuple_hash *
 init_conntrack(struct net *net, struct nf_conn *tmpl,
 	       const struct nf_conntrack_tuple *tuple,
-	       struct nf_conntrack_l3proto *l3proto,
-	       struct nf_conntrack_l4proto *l4proto,
+	       const struct nf_conntrack_l3proto *l3proto,
+	       const struct nf_conntrack_l4proto *l4proto,
 	       struct sk_buff *skb,
 	       unsigned int dataoff, u32 hash)
 {
@@ -1295,8 +1295,8 @@ void nf_conntrack_free(struct nf_conn *ct)
 		  unsigned int dataoff,
 		  u_int16_t l3num,
 		  u_int8_t protonum,
-		  struct nf_conntrack_l3proto *l3proto,
-		  struct nf_conntrack_l4proto *l4proto)
+		  const struct nf_conntrack_l3proto *l3proto,
+		  const struct nf_conntrack_l4proto *l4proto)
 {
 	const struct nf_conntrack_zone *zone;
 	struct nf_conntrack_tuple tuple;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 7999e70..5d08602 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -61,8 +61,8 @@
 static char __initdata version[] = "0.93";
 
 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
-				       const struct nf_conntrack_tuple *tuple,
-				       struct nf_conntrack_l4proto *l4proto)
+				const struct nf_conntrack_tuple *tuple,
+				const struct nf_conntrack_l4proto *l4proto)
 {
 	int ret = 0;
 	struct nlattr *nest_parms;
@@ -86,7 +86,7 @@ static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
 
 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 				    const struct nf_conntrack_tuple *tuple,
-				    struct nf_conntrack_l3proto *l3proto)
+				    const struct nf_conntrack_l3proto *l3proto)
 {
 	int ret = 0;
 	struct nlattr *nest_parms;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 1dcad22..62a2923 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -188,7 +188,7 @@ struct nf_conntrack_l4proto *
 }
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);
 
-void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p)
+void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p)
 {
 	module_put(p->me);
 }
@@ -242,7 +242,7 @@ int nf_ct_l3proto_register(struct nf_conntrack_l3proto *proto)
 extern unsigned int nf_conntrack_default_on;
 
 int nf_ct_l3proto_pernet_register(struct net *net,
-				  struct nf_conntrack_l3proto *proto)
+				  const struct nf_conntrack_l3proto *proto)
 {
 	if (nf_conntrack_default_on == 0)
 		return 0;
@@ -271,7 +271,7 @@ void nf_ct_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister);
 
 void nf_ct_l3proto_pernet_unregister(struct net *net,
-				     struct nf_conntrack_l3proto *proto)
+				     const struct nf_conntrack_l3proto *proto)
 {
 	/*
 	 * nf_conntrack_default_on *might* have registered hooks.
@@ -286,7 +286,7 @@ void nf_ct_l3proto_pernet_unregister(struct net *net,
 EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister);
 
 static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
-					      struct nf_conntrack_l4proto *l4proto)
+				const struct nf_conntrack_l4proto *l4proto)
 {
 	if (l4proto->get_net_proto) {
 		/* statically built-in protocols use static per-net */
@@ -301,7 +301,7 @@ static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
 static
 int nf_ct_l4proto_register_sysctl(struct net *net,
 				  struct nf_proto_net *pn,
-				  struct nf_conntrack_l4proto *l4proto)
+				  const struct nf_conntrack_l4proto *l4proto)
 {
 	int err = 0;
 
@@ -324,8 +324,8 @@ int nf_ct_l4proto_register_sysctl(struct net *net,
 
 static
 void nf_ct_l4proto_unregister_sysctl(struct net *net,
-				     struct nf_proto_net *pn,
-				     struct nf_conntrack_l4proto *l4proto)
+				struct nf_proto_net *pn,
+				const struct nf_conntrack_l4proto *l4proto)
 {
 #ifdef CONFIG_SYSCTL
 	if (pn->ctl_table_header != NULL)
@@ -395,7 +395,7 @@ int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto)
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one);
 
 int nf_ct_l4proto_pernet_register_one(struct net *net,
-				      struct nf_conntrack_l4proto *l4proto)
+				const struct nf_conntrack_l4proto *l4proto)
 {
 	int ret = 0;
 	struct nf_proto_net *pn = NULL;
@@ -420,7 +420,7 @@ int nf_ct_l4proto_pernet_register_one(struct net *net,
 }
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one);
 
-static void __nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
+static void __nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
 
 {
 	BUG_ON(l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos));
@@ -433,7 +433,7 @@ static void __nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
 			   &nf_conntrack_l4proto_generic);
 }
 
-void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
+void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
 {
 	mutex_lock(&nf_ct_proto_mutex);
 	__nf_ct_l4proto_unregister_one(l4proto);
@@ -444,7 +444,7 @@ void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one);
 
 void nf_ct_l4proto_pernet_unregister_one(struct net *net,
-					 struct nf_conntrack_l4proto *l4proto)
+				const struct nf_conntrack_l4proto *l4proto)
 {
 	struct nf_proto_net *pn = nf_ct_l4proto_net(net, l4proto);
 
@@ -478,8 +478,8 @@ int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto[],
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_register);
 
 int nf_ct_l4proto_pernet_register(struct net *net,
-				  struct nf_conntrack_l4proto *l4proto[],
-				  unsigned int num_proto)
+				struct nf_conntrack_l4proto * const l4proto[],
+				unsigned int num_proto)
 {
 	int ret = -EINVAL;
 	unsigned int i;
@@ -514,8 +514,8 @@ void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[],
 EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister);
 
 void nf_ct_l4proto_pernet_unregister(struct net *net,
-				     struct nf_conntrack_l4proto *l4proto[],
-				     unsigned int num_proto)
+				struct nf_conntrack_l4proto * const l4proto[],
+				unsigned int num_proto)
 {
 	while (num_proto-- != 0)
 		nf_ct_l4proto_pernet_unregister_one(net, l4proto[num_proto]);
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index 400e9ae..707a0d8 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -47,7 +47,8 @@
 };
 
 static int
-ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto,
+ctnl_timeout_parse_policy(void *timeouts,
+			  const struct nf_conntrack_l4proto *l4proto,
 			  struct net *net, const struct nlattr *attr)
 {
 	int ret = 0;
@@ -401,7 +402,7 @@ static int cttimeout_default_set(struct net *net, struct sock *ctnl,
 static int
 cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
 			    u32 seq, u32 type, int event,
-			    struct nf_conntrack_l4proto *l4proto)
+			    const struct nf_conntrack_l4proto *l4proto)
 {
 	struct nlmsghdr *nlh;
 	struct nfgenmsg *nfmsg;
