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, 3 insertions, 2 deletions

diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 85cccd6ed0b..bba658d9a03 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -55,7 +55,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 {
         struct net *net = dev_net(skb->dev);
         __be32 spi;
-        struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
+        const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
         struct ip_comp_hdr *ipcomph =
                 (struct ip_comp_hdr *)(skb->data + offset);
         struct xfrm_state *x;
@@ -64,7 +64,8 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                 return;
 
         spi = htonl(ntohs(ipcomph->cpi));
-        x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6);
+        x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+                              spi, IPPROTO_COMP, AF_INET6);
         if (!x)
                 return;