Index: head/net/igmpproxy/files/patch-src__os-freebsd.h
===================================================================
--- head/net/igmpproxy/files/patch-src__os-freebsd.h	(revision 406732)
+++ head/net/igmpproxy/files/patch-src__os-freebsd.h	(revision 406733)
@@ -1,14 +1,23 @@
---- src/os-freebsd.h.orig	2014-10-11 14:15:20 UTC
-+++ src/os-freebsd.h
-@@ -14,7 +14,11 @@
+--- src/os-freebsd.h.orig	2009-10-06 02:07:06.000000000 +0800
++++ src/os-freebsd.h	2016-01-20 15:43:54.364740000 +0800
+@@ -14,10 +14,20 @@
  
  static inline u_short ip_data_len(const struct ip *ip)
  {
-+#if __FreeBSD_version >= 900044
++#if __FreeBSD_version >= 1100030
++	return ntohs(ip->ip_len) - (ip->ip_hl << 2);
++#elif __FreeBSD_version >= 900044
 +	return ip->ip_len - (ip->ip_hl << 2);
 +#else
  	return ip->ip_len;
 +#endif
  }
  
  static inline void ip_set_len(struct ip *ip, u_short len)
+ {
++#if __FreeBSD_version >= 1100030
++	ip->ip_len = htons(len);
++#else
+ 	ip->ip_len = len;
++#endif
+ }