--- /dev/null
+# $OpenBSD: Makefile,v 1.1 2024/02/20 20:04:51 bluhm Exp $
+
+# Copyright (c) 2024 Alexander Bluhm <bluhm@openbsd.org>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+# Regression test for multipath routing.
+
+# Test that routes set with the -mpath flag distribute the traffic.
+# Each route has a different gateway and the UDP packets have different
+# source addresses. The destination address is identical for all
+# routes and packets. Analyze the use counter in netstat -r output
+# to check that multiple routes have been used. Currently this works
+# only for IPv4. sysctl net.inet.ip.multipath and net.inet6.ip6.multipath
+# are enabled before testing and reset afterwards. All routes and
+# interface addresses are created on loopback in a separate routing
+# domain.
+
+# Set up loopback interface in a different routing domain.
+# Create multipath routes on this loopback.
+# Send a bunch of packets with multiple source IP to same destination.
+# Count in netstart -r that most routes have been used.
+
+# This test uses routing domain and interface number 11.
+# Adjust it here, if you want to use something else.
+N1 = 11
+NUMS = ${N1}
+
+# Traffic distribution has not been implemented for IPv6.
+REGRESS_EXPECTED_FAILURES += run-netstat6
+
+.include <bsd.own.mk>
+
+.PHONY: busy-rdomains ifconfig unconfig pfctl
+
+REGRESS_SETUP_ONCE += busy-rdomains
+busy-rdomains:
+ # Check if rdomains are busy.
+.for n in ${NUMS}
+ @if /sbin/ifconfig | grep -v '^lo$n:' | grep ' rdomain $n '; then\
+ echo routing domain $n is already used >&2; exit 1; fi
+.endfor
+
+REGRESS_SETUP_ONCE += multipath
+multipath:
+ ${SUDO} /sbin/sysctl net.inet.ip.multipath=1
+ ${SUDO} /sbin/sysctl net.inet6.ip6.multipath=1
+
+REGRESS_CLEANUP += singlepath
+singlepath:
+ ${SUDO} /sbin/sysctl net.inet.ip.multipath=0
+ ${SUDO} /sbin/sysctl net.inet6.ip6.multipath=0
+
+REGRESS_SETUP_ONCE += ifconfig
+ifconfig: unconfig
+ # Create and configure loopback interfaces.
+.for n in ${NUMS}
+ ${SUDO} /sbin/ifconfig lo$n rdomain $n
+ ${SUDO} /sbin/ifconfig lo$n inet 10.0.0.1/8
+ ${SUDO} /sbin/ifconfig lo$n inet 10.0.0.$n alias
+.for i in 0 1 2 3 4 5 6 7 8 9
+ ${SUDO} /sbin/ifconfig lo$n inet 10.0.$n.$i alias
+ ${SUDO} /sbin/route -n -T $n add -inet -blackhole -mpath -host \
+ 10.$n.0.0 10.0.$n.$i
+.endfor
+ ${SUDO} /sbin/ifconfig lo$n inet6 fc00::$n alias
+.for i in 0 1 2 3 4 5 6 7 8 9
+ ${SUDO} /sbin/ifconfig lo$n inet6 fc00::$n:$i alias
+ ${SUDO} /sbin/route -n -T $n add -inet6 -blackhole -mpath -host \
+ fc00::$n:0:0 fc00::$n:$i
+.endfor
+ # Wait until IPv6 addresses are no longer tentative.
+ for i in `jot 50`; do\
+ if ! /sbin/ifconfig lo$n | fgrep -q tentative; then\
+ break;\
+ fi;\
+ sleep .1;\
+ done
+ ! /sbin/ifconfig lo${N1} | fgrep tentative
+.endfor
+
+REGRESS_CLEANUP += unconfig
+unconfig:
+ # Destroy interfaces.
+.for n in ${NUMS}
+ -${SUDO} /sbin/ifconfig lo$n rdomain $n
+.for i in 0 1 2 3 4 5 6 7 8 9
+ -${SUDO} /sbin/route -n -T $n delete -inet6 -host \
+ fc00::$n:0:0 fc00::$n:$i
+ -${SUDO} /sbin/route -n -T $n delete -inet -host \
+ 10.$n.0.0 10.0.$n.$i
+.endfor
+ -${SUDO} /sbin/ifconfig lo$n -inet -inet6
+ -${SUDO} /sbin/ifconfig lo$n destroy
+.endfor
+ rm -f stamp-ifconfig
+
+REGRESS_TARGETS += run-netcat
+run-netcat netstat.log:
+ # count UDP IPv6 packets used with multipath routes
+ rm -f netstat.log
+.for i in 0 1 2 3 4 5 6 7 8 9
+ /usr/bin/nc -4 -V${N1} -u -z -s10.0.${N1}.$i 10.${N1}.0.0 discard
+.endfor
+ /usr/bin/netstat -T${N1} -f inet -rn >netstat.log
+
+REGRESS_TARGETS += run-netstat
+run-netstat: netstat.log
+ # check route distribution of IPv4 packets
+ awk 'BEGIN{ mpath = uses = used = maxuse = 0; }\
+ /^10.${N1}.0.0 /{\
+ if ($$3 == "UGHSBP") mpath++;\
+ if ($$5 > 0) used++;\
+ if ($$5 > max) max = $$5;\
+ uses += $$5;\
+ }\
+ END{\
+ print "mpath "mpath", uses "uses", max "max", used "used;\
+ if (mpath != 10) { print "not 10 mpath: " mpath; exit 1; }\
+ if (uses != 10) { print "not 10 uses: " uses; exit 1; }\
+ if (max > 5) { print "max more than 5: " max; exit 1; }\
+ if (used < 5) { print "used less than 5: " used; exit 1; }\
+ }' \
+ netstat.log
+
+REGRESS_TARGETS += run-netcat6
+run-netcat6 netstat6.log:
+ # count UDP IPv6 packets used with multipath routes
+ rm -f netstat6.log
+.for i in 0 1 2 3 4 5 6 7 8 9
+ /usr/bin/nc -6 -V${N1} -u -z -sfc00::${N1}:$i fc00::${N1}:0:0 discard
+.endfor
+ /usr/bin/netstat -T${N1} -f inet6 -rn >netstat6.log
+
+REGRESS_TARGETS += run-netstat6
+run-netstat6: netstat6.log
+ # check route distribution of IPv6 packets
+ awk 'BEGIN{ mpath = used = uses = max = 0; }\
+ /^fc00::${N1}:0:0 /{\
+ if ($$3 == "UGHSBP") mpath++;\
+ if ($$5 > 0) used++;\
+ if ($$5 > max) max = $$5;\
+ uses += $$5;\
+ }\
+ END{\
+ print "mpath "mpath", uses "uses", max "max", used "used;\
+ if (mpath != 10) { print "not 10 mpath: " mpath; exit 1; }\
+ if (uses != 10) { print "not 10 uses: " uses; exit 1; }\
+ if (max > 5) { print "max more than 5: " max; exit 1; }\
+ if (used < 5) { print "used less than 5: " used; exit 1; }\
+ }' \
+ netstat6.log
+
+CLEANFILES += *.log stamp-*
+
+.include <bsd.regress.mk>
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