From b2a5e65b7d285636ca68e79c39c0b8e27f6d3bc7 Mon Sep 17 00:00:00 2001
From: bluhm <bluhm@openbsd.org>
Date: Wed, 21 Apr 2021 10:18:35 +0000
Subject: [PATCH] Check that path MTU discovery across routing domains inserts
 a dynamic IPv4 route.  Add IPv6 test that runs tcpbench over pair interfaces
 in different routing domains.  For that setup, PMTU currently does not work. 
 IPv6 TCP packets get fragmented.

---
 regress/sys/net/pair/Makefile | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/regress/sys/net/pair/Makefile b/regress/sys/net/pair/Makefile
index a0a95d09ec7..147fcb71b37 100644
--- a/regress/sys/net/pair/Makefile
+++ b/regress/sys/net/pair/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2021/02/05 14:12:17 bluhm Exp $
+#	$OpenBSD: Makefile,v 1.2 2021/04/21 10:18:35 bluhm Exp $
 
 # Copyright (c) 2021 Alexander Bluhm <bluhm@openbsd.org>
 #
@@ -161,14 +161,34 @@ run-ping6-$f-$t:
 REGRESS_TARGETS +=	run-tcpbench-$f-$t
 run-tcpbench-$f-$t:
 	rm -f nc.log
-	nc -v -l -V ${N$t} ${IP_${N$t}} 12345 >/dev/null 2>nc.log &
+	nc -4 -v -l -V ${N$t} ${IP_${N$t}} 12345 >/dev/null 2>nc.log &
 	# Wait until nc is listening.
 	for  i in `jot 30`; do\
 	    if fgrep -q Listening nc.log; then break; fi; sleep .1; done
 	fgrep Listening nc.log
 	# Test that path MTU dicovery is working.
-	tcpbench -t 5 -V ${N$f} -b ${IP_${N$f}} ${IP_${N$t}}
-	route -T ${N$f} -n get ${IP_${N$t}}
+	tcpbench -4 -t 5 -V ${N$f} -b ${IP_${N$f}} ${IP_${N$t}}
+.if $f == "3" && $t == "1"
+	# path MTU discovery must create a dynamic route
+	route -T ${N$f} -n get -host -inet ${IP_${N$t}} | grep DYNAMIC
+.endif
+
+REGRESS_TARGETS +=	run-tcpbench6-$f-$t
+run-tcpbench6-$f-$t:
+	rm -f nc.log
+	nc -6 -v -l -V ${N$t} ${IP6_${N$t}} 12345 >/dev/null 2>nc.log &
+	# Wait until nc is listening.
+	for  i in `jot 30`; do\
+	    if fgrep -q Listening nc.log; then break; fi; sleep .1; done
+	fgrep Listening nc.log
+	# Test that path MTU dicovery is working.
+	tcpbench -6 -t 5 -V ${N$f} -b ${IP6_${N$f}} ${IP6_${N$t}}
+.if $f == "3" && $t == "1"
+	# path MTU discovery in other rtable does not work in ip6_output()
+	route -T ${N$f} -n get -host -inet6 ${IP6_${N$t}}
+	@echo DISABLED
+.endif
+
 .endfor
 .endfor
 
-- 
2.20.1