net: constify struct inet6_protocol

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/protocol.h b/include/net/protocol.h
index cea2aee..60249e5 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -97,7 +97,7 @@
 extern const struct net_protocol *inet_protos[MAX_INET_PROTOS];
 
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
-extern struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
+extern const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
 #endif
 
 extern int	inet_add_protocol(const struct net_protocol *prot, unsigned char num);
@@ -106,8 +106,8 @@
 extern void	inet_unregister_protosw(struct inet_protosw *p);
 
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
-extern int	inet6_add_protocol(struct inet6_protocol *prot, unsigned char num);
-extern int	inet6_del_protocol(struct inet6_protocol *prot, unsigned char num);
+extern int	inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
+extern int	inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
 extern int	inet6_register_protosw(struct inet_protosw *p);
 extern void	inet6_unregister_protosw(struct inet_protosw *p);
 #endif