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Date:   Wed,  6 Jul 2022 18:05:26 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH net 2/2] selftests/net: test nexthop without gw

This test implement the scenario described in the previous patch.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 tools/testing/selftests/net/Makefile          |   2 +-
 .../selftests/net/fib_nexthop_nongw.sh        | 125 ++++++++++++++++++
 2 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/net/fib_nexthop_nongw.sh

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index ddad703ace34..db05b3764b77 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -11,7 +11,7 @@ TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
 TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh
 TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh ipv6_flowlabel.sh
 TEST_PROGS += tcp_fastopen_backup_key.sh fcnal-test.sh l2tp.sh traceroute.sh
-TEST_PROGS += fin_ack_lat.sh fib_nexthop_multiprefix.sh fib_nexthops.sh
+TEST_PROGS += fin_ack_lat.sh fib_nexthop_multiprefix.sh fib_nexthops.sh fib_nexthop_nongw.sh
 TEST_PROGS += altnames.sh icmp.sh icmp_redirect.sh ip6_gre_headroom.sh
 TEST_PROGS += route_localnet.sh
 TEST_PROGS += reuseaddr_ports_exhausted.sh
diff --git a/tools/testing/selftests/net/fib_nexthop_nongw.sh b/tools/testing/selftests/net/fib_nexthop_nongw.sh
new file mode 100755
index 000000000000..6e82562eaf4a
--- /dev/null
+++ b/tools/testing/selftests/net/fib_nexthop_nongw.sh
@@ -0,0 +1,125 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# ns: h1               | ns: h2           
+#   192.168.0.1/24     |
+#            eth0      |
+#                      |       192.168.1.1/32
+#            veth0 <---|---> veth1        
+# Validate source address selection for route without gateway
+
+PAUSE_ON_FAIL=no
+VERBOSE=0
+ret=0
+
+################################################################################
+# helpers
+
+log_test()
+{
+	local rc=$1
+	local expected=$2
+	local msg="$3"
+
+	if [ ${rc} -eq ${expected} ]; then
+		printf "TEST: %-60s  [ OK ]\n" "${msg}"
+		nsuccess=$((nsuccess+1))
+	else
+		ret=1
+		nfail=$((nfail+1))
+		printf "TEST: %-60s  [FAIL]\n" "${msg}"
+		if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+			echo
+			echo "hit enter to continue, 'q' to quit"
+			read a
+			[ "$a" = "q" ] && exit 1
+		fi
+	fi
+
+	[ "$VERBOSE" = "1" ] && echo
+}
+
+run_cmd()
+{
+	local cmd="$*"
+	local out
+	local rc
+
+	if [ "$VERBOSE" = "1" ]; then
+		echo "COMMAND: $cmd"
+	fi
+
+	out=$(eval $cmd 2>&1)
+	rc=$?
+	if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+		echo "$out"
+	fi
+
+	[ "$VERBOSE" = "1" ] && echo
+
+	return $rc
+}
+
+################################################################################
+# config
+setup()
+{
+	ip netns add h1
+	ip -n h1 link set lo up
+	ip netns add h2
+	ip -n h2 link set lo up
+	sleep 1
+
+	# Add a fake eth0 to support an ip address
+	ip -n h1 link add name eth0 type dummy
+	ip -n h1 link set eth0 up
+	ip -n h1 address add 192.168.0.1/24 dev eth0
+
+	# Configure veths (same @mac, arp off)
+	ip -n h1 link add name veth0 type veth peer name veth1 netns h2
+	ip -n h1 link set veth0 address 00:09:c0:26:05:82
+	ip -n h1 link set veth0 arp off
+	ip -n h1 link set veth0 up
+
+	ip -n h2 link set veth1 address 00:09:c0:26:05:82
+	ip -n h2 link set veth1 arp off
+	ip -n h2 link set veth1 up
+
+	# Configure @IP in the peer netns
+	ip -n h2 address add 192.168.1.1/32 dev veth1
+	ip -n h2 route add default dev veth1
+
+	# Add a nexthop without @gw and use it in a route
+	ip -n h1 nexthop add id 1 dev veth0
+	ip -n h1 route add 192.168.1.1 nhid 1
+}
+
+cleanup()
+{
+	ip netns del h1 2>/dev/null
+	ip netns del h2 2>/dev/null
+}
+
+################################################################################
+# main
+
+while getopts :pv o
+do
+	case $o in
+		p) PAUSE_ON_FAIL=yes;;
+		v) VERBOSE=1;;
+	esac
+done
+
+cleanup
+setup
+sleep 2
+
+run_cmd ip -netns h1 route get 192.168.1.1
+log_test $? 0 "nexthop: get route with nexthop without gw"
+run_cmd ip netns exec h1 ping -c1 192.168.1.1
+log_test $? 0 "nexthop: ping through nexthop without gw"
+
+cleanup
+
+exit $ret
-- 
2.33.0

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