treewide: Add include guards

...at the moment, just for consistency with packet.h, icmp.h,
tcp.h and udp.h.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/dhcpv6.h b/dhcpv6.h
index 73d28d3..b476133 100644
--- a/dhcpv6.h
+++ b/dhcpv6.h
@@ -3,6 +3,11 @@
  * Author: Stefano Brivio <sbrivio@redhat.com>
  */
 
+#ifndef DHCPV6_H
+#define DHCPV6_H
+
 int dhcpv6(struct ctx *c, struct pool *p,
 	   struct in6_addr *saddr, struct in6_addr *daddr);
 void dhcpv6_init(struct ctx *c);
+
+#endif /* DHCPV6_H */