diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 6c30a73..58c4b0f 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -244,7 +244,7 @@
 static inline int inet_netns_ok(struct net *net, int protocol)
 {
 	int hash;
-	struct net_protocol *ipprot;
+	const struct net_protocol *ipprot;
 
 	if (net_eq(net, &init_net))
 		return 1;
@@ -1162,7 +1162,7 @@
 static int inet_gso_send_check(struct sk_buff *skb)
 {
 	struct iphdr *iph;
-	struct net_protocol *ops;
+	const struct net_protocol *ops;
 	int proto;
 	int ihl;
 	int err = -EINVAL;
@@ -1198,7 +1198,7 @@
 {
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
 	struct iphdr *iph;
-	struct net_protocol *ops;
+	const struct net_protocol *ops;
 	int proto;
 	int ihl;
 	int id;
@@ -1265,7 +1265,7 @@
 static struct sk_buff **inet_gro_receive(struct sk_buff **head,
 					 struct sk_buff *skb)
 {
-	struct net_protocol *ops;
+	const struct net_protocol *ops;
 	struct sk_buff **pp = NULL;
 	struct sk_buff *p;
 	struct iphdr *iph;
@@ -1342,7 +1342,7 @@
 
 static int inet_gro_complete(struct sk_buff *skb)
 {
-	struct net_protocol *ops;
+	const struct net_protocol *ops;
 	struct iphdr *iph = ip_hdr(skb);
 	int proto = iph->protocol & (MAX_INET_PROTOS - 1);
 	int err = -ENOSYS;
@@ -1427,13 +1427,13 @@
 EXPORT_SYMBOL_GPL(snmp_mib_free);
 
 #ifdef CONFIG_IP_MULTICAST
-static struct net_protocol igmp_protocol = {
+static const struct net_protocol igmp_protocol = {
 	.handler =	igmp_rcv,
 	.netns_ok =	1,
 };
 #endif
 
-static struct net_protocol tcp_protocol = {
+static const struct net_protocol tcp_protocol = {
 	.handler =	tcp_v4_rcv,
 	.err_handler =	tcp_v4_err,
 	.gso_send_check = tcp_v4_gso_send_check,
@@ -1444,7 +1444,7 @@
 	.netns_ok =	1,
 };
 
-static struct net_protocol udp_protocol = {
+static const struct net_protocol udp_protocol = {
 	.handler =	udp_rcv,
 	.err_handler =	udp_err,
 	.gso_send_check = udp4_ufo_send_check,
@@ -1453,7 +1453,7 @@
 	.netns_ok =	1,
 };
 
-static struct net_protocol icmp_protocol = {
+static const struct net_protocol icmp_protocol = {
 	.handler =	icmp_rcv,
 	.no_policy =	1,
 	.netns_ok =	1,
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index e878e49..5c66270 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -311,7 +311,7 @@
 	.output		= ah_output
 };
 
-static struct net_protocol ah4_protocol = {
+static const struct net_protocol ah4_protocol = {
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	ah4_err,
 	.no_policy	=	1,
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 18bb383..12f7287 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -615,7 +615,7 @@
 	.output		= esp_output
 };
 
-static struct net_protocol esp4_protocol = {
+static const struct net_protocol esp4_protocol = {
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	esp4_err,
 	.no_policy	=	1,
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 97c410e..5bc13fe 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -655,7 +655,7 @@
 	struct iphdr *iph;
 	struct icmphdr *icmph;
 	int hash, protocol;
-	struct net_protocol *ipprot;
+	const struct net_protocol *ipprot;
 	u32 info = 0;
 	struct net *net;
 
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 533afaa..d9645c9 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1288,7 +1288,7 @@
 }
 
 
-static struct net_protocol ipgre_protocol = {
+static const struct net_protocol ipgre_protocol = {
 	.handler	=	ipgre_rcv,
 	.err_handler	=	ipgre_err,
 	.netns_ok	=	1,
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index db46b4b..6c98b43 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -202,7 +202,7 @@
 	{
 		int protocol = ip_hdr(skb)->protocol;
 		int hash, raw;
-		struct net_protocol *ipprot;
+		const struct net_protocol *ipprot;
 
 	resubmit:
 		raw = raw_local_deliver(skb, protocol);
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 3262ce0..38fbf04 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -146,7 +146,7 @@
 	.output		= ipcomp_output
 };
 
-static struct net_protocol ipcomp4_protocol = {
+static const struct net_protocol ipcomp4_protocol = {
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	ipcomp4_err,
 	.no_policy	=	1,
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 65d421c..c43ec2d 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -99,10 +99,6 @@
 			     struct sk_buff *pkt, vifi_t vifi, int assert);
 static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm);
 
-#ifdef CONFIG_IP_PIMSM_V2
-static struct net_protocol pim_protocol;
-#endif
-
 static struct timer_list ipmr_expire_timer;
 
 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
@@ -1945,7 +1941,7 @@
 #endif
 
 #ifdef CONFIG_IP_PIMSM_V2
-static struct net_protocol pim_protocol = {
+static const struct net_protocol pim_protocol = {
 	.handler	=	pim_rcv,
 	.netns_ok	=	1,
 };
diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
index a2e5fc0..542f22f 100644
--- a/net/ipv4/protocol.c
+++ b/net/ipv4/protocol.c
@@ -28,14 +28,14 @@
 #include <linux/spinlock.h>
 #include <net/protocol.h>
 
-struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp;
+const struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp;
 static DEFINE_SPINLOCK(inet_proto_lock);
 
 /*
  *	Add a protocol handler to the hash tables
  */
 
-int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
+int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
 {
 	int hash, ret;
 
@@ -57,7 +57,7 @@
  *	Remove a protocol from the hash tables.
  */
 
-int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
+int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
 {
 	int hash, ret;
 
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index cb1f0e8..3959e0c 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -132,7 +132,7 @@
 }
 #endif
 
-static struct net_protocol tunnel4_protocol = {
+static const struct net_protocol tunnel4_protocol = {
 	.handler	=	tunnel4_rcv,
 	.err_handler	=	tunnel4_err,
 	.no_policy	=	1,
@@ -140,7 +140,7 @@
 };
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static struct net_protocol tunnel64_protocol = {
+static const struct net_protocol tunnel64_protocol = {
 	.handler	=	tunnel64_rcv,
 	.err_handler	=	tunnel64_err,
 	.no_policy	=	1,
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index c784891..95248d7 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -25,7 +25,7 @@
 	__udp4_lib_err(skb, info, &udplite_table);
 }
 
-static	struct net_protocol udplite_protocol = {
+static const struct net_protocol udplite_protocol = {
 	.handler	= udplite_rcv,
 	.err_handler	= udplite_err,
 	.no_policy	= 1,