ipvtap_test.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3#
  4# Simple tests for ipvtap
  5
  6
  7#
  8# The testing environment looks this way:
  9#
 10# |------HNS-------|     |------PHY-------|
 11# |      veth<----------------->veth      |
 12# |------|--|------|     |----------------|
 13#        |  |
 14#        |  |            |-----TST0-------|
 15#        |  |------------|----ipvlan      |
 16#        |               |----------------|
 17#        |
 18#        |               |-----TST1-------|
 19#        |---------------|----ipvlan      |
 20#                        |----------------|
 21#
 22
 23ALL_TESTS="
 24	test_ip_set
 25"
 26
 27source lib.sh
 28
 29DEBUG=0
 30
 31VETH_HOST=vethtst.h
 32VETH_PHY=vethtst.p
 33
 34NS_COUNT=32
 35IP_ITERATIONS=1024
 36IPSET_TIMEOUT="60s"
 37
 38ns_run() {
 39	ns=$1
 40	shift
 41	if [[ "$ns" == "global" ]]; then
 42		"$@" >/dev/null
 43	else
 44		ip netns exec "$ns" "$@" >/dev/null
 45	fi
 46}
 47
 48test_ip_setup_env() {
 49	setup_ns NS_PHY
 50	setup_ns HST_NS
 51
 52	# setup simulated other-host (phy) and host itself
 53	ns_run "$HST_NS" ip link add $VETH_HOST type veth peer name $VETH_PHY \
 54		netns "$NS_PHY" >/dev/null
 55	ns_run "$HST_NS" ip link set $VETH_HOST up
 56	ns_run "$NS_PHY" ip link set $VETH_PHY up
 57
 58	for ((i=0; i<NS_COUNT; i++)); do
 59		setup_ns ipvlan_ns_$i
 60		ns="ipvlan_ns_$i"
 61		if [ "$DEBUG" = "1" ]; then
 62			echo "created NS ${!ns}"
 63		fi
 64		if ! ns_run "$HST_NS" ip link add netns ${!ns} ipvlan0 \
 65		    link $VETH_HOST \
 66		    type ipvtap mode l2 bridge; then
 67			exit_error "FAIL: Failed to configure ipvlan link."
 68		fi
 69	done
 70}
 71
 72test_ip_cleanup_env() {
 73	ns_run "$HST_NS" ip link del $VETH_HOST
 74	cleanup_all_ns
 75}
 76
 77exit_error() {
 78	echo "$1"
 79	exit $ksft_fail
 80}
 81
 82rnd() {
 83	echo $(( RANDOM % 32 + 16 ))
 84}
 85
 86test_ip_set_thread() {
 87	# Here we are trying to create some IP conflicts between namespaces.
 88	# If just add/remove IP, nothing interesting will happen.
 89	# But if add random IP and then remove random IP,
 90	# eventually conflicts start to apear.
 91	ip link set ipvlan0 up
 92	for ((i=0; i<IP_ITERATIONS; i++)); do
 93		v=$(rnd)
 94		ip a a "172.25.0.$v/24" dev ipvlan0 2>/dev/null
 95		ip a a "fc00::$v/64" dev ipvlan0 2>/dev/null
 96		v=$(rnd)
 97		ip a d "172.25.0.$v/24" dev ipvlan0 2>/dev/null
 98		ip a d "fc00::$v/64" dev ipvlan0 2>/dev/null
 99	done
100}
101
102test_ip_set() {
103	RET=0
104
105	trap test_ip_cleanup_env EXIT
106
107	test_ip_setup_env
108
109	declare -A ns_pids
110	for ((i=0; i<NS_COUNT; i++)); do
111		ns="ipvlan_ns_$i"
112		ns_run ${!ns} timeout "$IPSET_TIMEOUT" \
113			bash -c "$0 test_ip_set_thread"&
114		ns_pids[$i]=$!
115	done
116
117	for ((i=0; i<NS_COUNT; i++)); do
118		wait "${ns_pids[$i]}"
119	done
120
121	declare -A all_ips
122	for ((i=0; i<NS_COUNT; i++)); do
123		ns="ipvlan_ns_$i"
124		ip_output=$(ip netns exec ${!ns} ip a l dev ipvlan0 | grep inet)
125		while IFS= read -r nsip_out; do
126			if [[ -z $nsip_out ]]; then
127				continue;
128			fi
129			nsip=$(awk '{print $2}' <<< "$nsip_out")
130			if [[ -v all_ips[$nsip] ]]; then
131				RET=$ksft_fail
132				log_test "conflict for $nsip"
133				return "$RET"
134			else
135				all_ips[$nsip]=$i
136			fi
137		done <<< "$ip_output"
138	done
139
140	if [ "$DEBUG" = "1" ]; then
141		for key in "${!all_ips[@]}"; do
142			echo "$key: ${all_ips[$key]}"
143		done
144	fi
145
146	trap - EXIT
147	test_ip_cleanup_env
148
149	log_test "test multithreaded ip set"
150}
151
152if [[ "$1" == "-d" ]]; then
153	DEBUG=1
154	shift
155fi
156
157if [[ "$1" == "-t" ]]; then
158	shift
159	TESTS="$*"
160fi
161
162if [[ "$1" == "test_ip_set_thread" ]]; then
163	test_ip_set_thread
164else
165	require_command ip
166
167	tests_run
168fi