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From: Michael Tuexen <tuexen@FreeBSD.org>
Date: Fri, 28 Apr 2017 15:38:34 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r317558 - head/sys/netinet
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Author: tuexen
Date: Fri Apr 28 15:38:34 2017
New Revision: 317558
URL: https://svnweb.freebsd.org/changeset/base/317558

Log:
  Set the DF bit for responses to out-of-the-blue packets.
  
  MFC after:	1 week

Modified:
  head/sys/netinet/sctp_output.c

Modified: head/sys/netinet/sctp_output.c
==============================================================================
--- head/sys/netinet/sctp_output.c	Fri Apr 28 15:15:26 2017	(r317557)
+++ head/sys/netinet/sctp_output.c	Fri Apr 28 15:38:34 2017	(r317558)
@@ -11147,7 +11147,7 @@ sctp_send_resp_msg(struct sockaddr *src,
 		ip->ip_v = IPVERSION;
 		ip->ip_hl = (sizeof(struct ip) >> 2);
 		ip->ip_tos = 0;
-		ip->ip_off = 0;
+		ip->ip_off = htons(IP_DF);
 		ip_fillid(ip);
 		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
 		if (port) {