Commit cd72e61b authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by Paolo Abeni
Browse files

selftests/net: test nexthop without gw 

This test implement the scenario described in the commit
"ip: fix dflt addr selection for connected nexthop".
The test configures a nexthop object with an output device only (no gateway
address) and a route that uses this nexthop. The goal is to check if the
kernel selects a valid source address.

Link: https://lore.kernel.org/netdev/20220712095545.10947-1-nicolas.dichtel@6wind.com/


Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://lore.kernel.org/r/20220713114853.29406-2-nicolas.dichtel@6wind.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 747c1430

tools/testing/selftests/net/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

tools/testing/selftests/net/fib_nexthop_nongw.sh

0 → 100755
+119 −0
Original line number Diff line number Diff line 
#!/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



	# 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 up



	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

}



trap cleanup EXIT



################################################################################

# main



while getopts :pv o

do

	case $o in

		p) PAUSE_ON_FAIL=yes;;

		v) VERBOSE=1;;

	esac

done



cleanup

setup



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"



exit $ret