inet: constify ip headers and in6_addr

Add const qualifiers to structs iphdr, ipv6hdr and in6_addr pointers
where possible, to make code intention more obvious.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/net/route.h b/include/net/route.h
index 3782cddd1383..b3962e249e14 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -191,7 +191,8 @@ static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 s
         return ip_route_input_common(skb, dst, src, tos, devin, true);
 }
 
-extern unsigned short   ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
+extern unsigned short   ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
+                                          unsigned short new_mtu, struct net_device *dev);
 extern void             ip_rt_send_redirect(struct sk_buff *skb);
 
 extern unsigned         inet_addr_type(struct net *net, __be32 addr);