[RFC PATCH net-next 04/12] selftests: forwarding: Add a test for basic IPv4 and IPv6 routing

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Configure two hosts which are directly connected to the same router and
test IPv4 and IPv6 ping. Use a large MTU and check that ping is
unaffected.

Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxxxx>
---
 tools/testing/selftests/forwarding/Makefile  |   2 +-
 tools/testing/selftests/forwarding/lib.sh    |  15 +++
 tools/testing/selftests/forwarding/router.sh | 131 +++++++++++++++++++++++++++
 3 files changed, 147 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/forwarding/router.sh

diff --git a/tools/testing/selftests/forwarding/Makefile b/tools/testing/selftests/forwarding/Makefile
index ef9380c49123..4efb0c96af94 100644
--- a/tools/testing/selftests/forwarding/Makefile
+++ b/tools/testing/selftests/forwarding/Makefile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for forwarding selftests
 
-TEST_PROGS := bridge.sh
+TEST_PROGS := bridge.sh router.sh
 
 include ../lib.mk
diff --git a/tools/testing/selftests/forwarding/lib.sh b/tools/testing/selftests/forwarding/lib.sh
index 03e5253b30d8..11b6f6101d10 100644
--- a/tools/testing/selftests/forwarding/lib.sh
+++ b/tools/testing/selftests/forwarding/lib.sh
@@ -176,6 +176,21 @@ bridge_ageing_time_get()
 	echo $((ageing_time / 100))
 }
 
+forwarding_enable()
+{
+       ipv4_fwd=$(sysctl -n net.ipv4.conf.all.forwarding)
+       ipv6_fwd=$(sysctl -n net.ipv6.conf.all.forwarding)
+
+       sysctl -q -w net.ipv4.conf.all.forwarding=1
+       sysctl -q -w net.ipv6.conf.all.forwarding=1
+}
+
+forwarding_restore()
+{
+       sysctl -q -w net.ipv6.conf.all.forwarding=$ipv6_fwd
+       sysctl -q -w net.ipv4.conf.all.forwarding=$ipv4_fwd
+}
+
 ### Tests ###
 
 ping_test()
diff --git a/tools/testing/selftests/forwarding/router.sh b/tools/testing/selftests/forwarding/router.sh
new file mode 100755
index 000000000000..79ad6cba9118
--- /dev/null
+++ b/tools/testing/selftests/forwarding/router.sh
@@ -0,0 +1,131 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+NUM_NETIFS=4
+source lib.sh
+
+h1_create()
+{
+	vrf_create "vrf-h1" 1
+	ip link set dev $h1 master vrf-h1
+
+	ip link set dev vrf-h1 up
+	ip link set dev $h1 up
+
+	ip address add 192.0.2.2/24 dev $h1
+	ip address add 2001:db8:1::2/64 dev $h1
+
+	ip route add 198.51.100.0/24 vrf vrf-h1 nexthop via 192.0.2.1
+	ip route add 2001:db8:2::/64 vrf vrf-h1 nexthop via 2001:db8:1::1
+}
+
+h1_destroy()
+{
+	ip route del 2001:db8:2::/64 vrf vrf-h1
+	ip route del 198.51.100.0/24 vrf vrf-h1
+
+	ip address del 2001:db8:1::2/64 dev $h1
+	ip address del 192.0.2.2/24 dev $h1
+
+	ip link set dev $h1 down
+	vrf_destroy "vrf-h1" 1
+}
+
+h2_create()
+{
+	vrf_create "vrf-h2" 2
+	ip link set dev $h2 master vrf-h2
+
+	ip link set dev vrf-h2 up
+	ip link set dev $h2 up
+
+	ip address add 198.51.100.2/24 dev $h2
+	ip address add 2001:db8:2::2/64 dev $h2
+
+	ip route add 192.0.2.0/24 vrf vrf-h2 nexthop via 198.51.100.1
+	ip route add 2001:db8:1::/64 vrf vrf-h2 nexthop via 2001:db8:2::1
+}
+
+h2_destroy()
+{
+	ip route del 2001:db8:1::/64 vrf vrf-h2
+	ip route del 192.0.2.0/24 vrf vrf-h2
+
+	ip address del 2001:db8:2::2/64 dev $h2
+	ip address del 198.51.100.2/24 dev $h2
+
+	ip link set dev $h2 down
+	vrf_destroy "vrf-h2" 2
+}
+
+router_create()
+{
+	ip link set dev $rp1 up
+	ip link set dev $rp2 up
+
+	ip address add 192.0.2.1/24 dev $rp1
+	ip address add 2001:db8:1::1/64 dev $rp1
+
+	ip address add 198.51.100.1/24 dev $rp2
+	ip address add 2001:db8:2::1/64 dev $rp2
+}
+
+router_destroy()
+{
+	ip address del 2001:db8:2::1/64 dev $rp2
+	ip address del 198.51.100.1/24 dev $rp2
+
+	ip address del 2001:db8:1::1/64 dev $rp1
+	ip address del 192.0.2.1/24 dev $rp1
+
+	ip link set dev $rp2 down
+	ip link set dev $rp1 down
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	rp1=${NETIFS[p2]}
+
+	rp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	netifs_arr=($h1 $rp1 $rp2 $h2)
+
+	vrf_prepare
+
+	h1_create
+	h2_create
+
+	router_create
+
+	forwarding_enable
+}
+
+cleanup()
+{
+	forwarding_restore
+
+	router_destroy
+
+	h2_destroy
+	h1_destroy
+
+	vrf_cleanup
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+ping_test "vrf-h1" 198.51.100.2
+ping_test "vrf-h1" 2001:db8:2::2
+
+old_mtu=$(mtu_get $h1)
+mtu_change 9000 "${netifs_arr[@]}"
+ping_test "vrf-h1" 198.51.100.2
+ping_test "vrf-h1" 2001:db8:2::2
+mtu_change $old_mtu "${netifs_arr[@]}"
+
+exit $EXIT_STATUS
-- 
2.14.3

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