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/esp6.c b/net/ipv6/esp6.c
index 5aa8ec88f194..e97b4b7ca2f2 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -430,7 +430,7 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                      u8 type, u8 code, int offset, __be32 info)
 {
         struct net *net = dev_net(skb->dev);
-        struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
+        const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
         struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
         struct xfrm_state *x;
 
@@ -438,7 +438,8 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
             type != ICMPV6_PKT_TOOBIG)
                 return;
 
-        x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
+        x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
+                              esph->spi, IPPROTO_ESP, AF_INET6);
         if (!x)
                 return;
         printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%pI6\n",