From 50aa824955f4311ecdc302cf17976bddbd2aa2b2 Mon Sep 17 00:00:00 2001
From: Peter Hessler <phessler@cvs.openbsd.org>
Date: Sun, 22 Jan 2017 00:39:46 +0000
Subject: set the TOS/ECN field to Internetwork Control, since that is exactly
 what we are doing

---
 sys/net/bfd.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sys/net/bfd.c b/sys/net/bfd.c
index dacc735ddc0..250d5a690c1 100644
--- a/sys/net/bfd.c
+++ b/sys/net/bfd.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bfd.c,v 1.54 2017/01/21 10:15:15 phessler Exp $	*/
+/*	$OpenBSD: bfd.c,v 1.55 2017/01/22 00:39:45 phessler Exp $	*/
 
 /*
  * Copyright (c) 2016 Peter Hessler <phessler@openbsd.org>
@@ -443,6 +443,17 @@ bfd_listener(struct bfd_config *bfd, unsigned int port)
 		goto close;
 	}
 
+	MGET(mopt, M_WAIT, MT_SOOPTS);
+	mopt->m_len = sizeof(int);
+	ip = mtod(mopt, int *);
+	*ip = IPTOS_PREC_INTERNETCONTROL;
+	error = sosetopt(so, IPPROTO_IP, IP_TOS, mopt);
+	if (error) {
+		printf("%s: sosetopt error %d\n",
+		    __func__, error);
+		goto close;
+	}
+
 	MGET(m, M_WAIT, MT_SONAME);
 	m->m_len = src->sa_len;
 	sa = mtod(m, struct sockaddr *);
-- 
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