calipso: Set the calipso socket label to match the secattr.

CALIPSO is a hop-by-hop IPv6 option.  A lot of this patch is based on
the equivalent CISPO code.  The main difference is due to manipulating
the options in the hop-by-hop header.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 887313d..4e279a8 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -319,6 +319,8 @@
 
 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 		       const struct inet6_skb_parm *opt);
+struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
+					   struct ipv6_txoptions *opt);
 
 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
 {