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Message-ID: <053f57d79058138d09a0e606c0500a40cb78596d.1714982035.git.antony.antony@secunet.com>
Date: Mon, 6 May 2024 10:05:54 +0200
From: Antony Antony <antony.antony@...unet.com>
To: Jakub Kicinski <kuba@...nel.org>, Steffen Klassert
<steffen.klassert@...unet.com>, <netdev@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>
CC: "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, "Herbert
Xu" <herbert@...dor.apana.org.au>, Antony Antony <antony.antony@...unet.com>,
Shuah Khan <shuah@...nel.org>, <devel@...ux-ipsec.org>
Subject: [PATCH net-next v3 2/2] selftests/net: add ICMP unreachable over
IPsec tunnel
Add IPsec tunnel, aka xfrm state, tests with ICMP flags enabled.
IPv4 and IPv6, unreachable tests over xfrm/IPsec tunnels,
xfrm SA with "flag icmp" set.
Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
v2->v3: fix the IFS whitespace. It got mangled
---
tools/testing/selftests/net/Makefile | 1 +
tools/testing/selftests/net/xfrm_state.sh | 624 ++++++++++++++++++++++
2 files changed, 625 insertions(+)
create mode 100755 tools/testing/selftests/net/xfrm_state.sh
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 5befca249452..7d96b3e411b7 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -53,6 +53,7 @@ TEST_PROGS += bind_bhash.sh
TEST_PROGS += ip_local_port_range.sh
TEST_PROGS += rps_default_mask.sh
TEST_PROGS += big_tcp.sh
+TEST_PROGS += xfrm_state.sh
TEST_PROGS_EXTENDED := toeplitz_client.sh toeplitz.sh
TEST_GEN_FILES = socket nettest
TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any
diff --git a/tools/testing/selftests/net/xfrm_state.sh b/tools/testing/selftests/net/xfrm_state.sh
new file mode 100755
index 000000000000..26eac013abcf
--- /dev/null
+++ b/tools/testing/selftests/net/xfrm_state.sh
@@ -0,0 +1,624 @@
+#!/bin/bash -u
+# SPDX-License-Identifier: GPL-2.0
+#
+# Checks for xfrm/ESP/IPsec tunnel.
+# - The unreachable tests are for icmp error handling.
+# As specified in IETF RFC 4301 section 6.
+#
+# See "test=" below for the implemented tests.
+#
+# Network topology default
+# 10.1.c.d or IPv6 fc00:c::d/64
+# 1.1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2 6.1 6.2
+# eth0 eth1 eth0 eth1 eth0 eth1 eth0 eth1 eth0 eth1 eth0 eth1
+# a -------- r1 -------- s1 -------- r2 -------- s2 -------- r3 -------- b
+# a, b = Alice and Bob hosts without IPsec.
+# r1, r2, r3 routers without IPsec
+# s1, s2, IPsec gateways/routers that setup tunnel(s).
+#
+# Network topology: x for IPsec gateway that generate ICMP response.
+# 10.1.c.d or IPv6 fc00:c::d/64
+# 1.1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2
+# eth0 eth1 eth0 eth1 eth0 eth1 eth0 eth1 eth0 eth1
+# a -------- r1 -------- s1 -------- r2 -------- s2 -------- b
+#
+
+source lib.sh
+
+PAUSE_ON_FAIL=no
+VERBOSE=${VERBOSE:-0}
+TRACING=0
+
+# Name Description
+tests="
+ unreachable_ipv4 IPv4 unreachable from router r3
+ unreachable_ipv4 IPv6 unreachable from router r3
+ unreachable_gw_ipv4 IPv4 unreachable from IPsec gateway s2
+ unreachable_gw_ipv6 IPv6 unreachable from IPsec gateway s2
+ mtu_ipv4_r2 IPv4 MTU exceeded from ESP router r2
+ mtu_ipv6_r2 IPv6 MTU exceeded from ESP router r2
+ mtu_ipv4_r3 IPv4 MTU exceeded router r3
+ mtu_ipv6_r3 IPv6 MTU exceeded router r3"
+
+ns_set="a r1 s1 r2 s2 r3 b" # Network topology default
+imax=7 # number of namespaces in the test
+
+prefix4="10.1"
+prefix6="fc00"
+
+run_cmd() {
+ cmd="$*"
+
+ if [ "$VERBOSE" -gt 0 ]; then
+ printf " COMMAND: $cmd\n"
+ fi
+
+ out="$($cmd 2>&1)"
+ rc=$?
+ if [ "$VERBOSE" -gt 1 -a -n "$out" ]; then
+ echo " $out"
+ echo
+ fi
+ return $rc
+}
+
+run_test() {
+ (
+ tname="$1"
+ tdesc="$2"
+
+
+ unset IFS
+
+ fail="yes"
+
+ # Since cleanup() relies on variables modified by this sub shell, it
+ # has to run in this context.
+ trap cleanup EXIT
+
+ if [ "$VERBOSE" -gt 0 ]; then
+ printf "\n#####################################################################\n\n"
+ fi
+
+ # if errexit was not set, set it and unset after test eval
+ errexit=0
+ if [[ $- =~ "e" ]]; then
+ errexit=1
+ else
+ set -e
+ fi
+
+ eval test_${tname}
+ ret=$?
+ fail="no"
+ [ $errexit -eq 0 ] && set +e # hack until exception is fixed
+
+ if [ $ret -eq 0 ]; then
+ printf "TEST: %-60s [ PASS ]\n" "${tdesc}"
+ elif [ $ret -eq 1 ]; then
+ printf "TEST: %-60s [FAIL]\n" "${tdesc}"
+ if [ "$VERBOSE" -eq 0 -o -n "${out}" -o -n "${out}" ]; then
+ echo "#####################################################################"
+ [ -n "${cmd}" ] && echo -e "${cmd}"
+ [ -n "${out}" ] && echo -e "${out}"
+ echo "#####################################################################"
+ fi
+ if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+ echo
+ echo "Pausing. Hit enter to continue"
+ read a
+ fi
+ err_flush
+ exit 1
+ elif [ $ret -eq $ksft_skip ]; then
+ printf "TEST: %-60s [SKIP]\n" "${tdesc}"
+ err_flush
+ fi
+
+ return $ret
+ )
+ ret=$?
+ case $ret in
+ 0)
+ all_skipped=false
+ [ $exitcode -eq $ksft_skip ] && exitcode=0
+ ;;
+ $ksft_skip)
+ [ $all_skipped = true ] && exitcode=$ksft_skip
+ ;;
+ *)
+ all_skipped=false
+ exitcode=1
+ ;;
+ esac
+
+ return $ret
+}
+
+# Find the auto-generated name for this namespace
+nsname() {
+ eval echo ns_$1
+}
+
+nscmd() {
+ eval echo "ip netns exec $1"
+}
+
+setup_namespace() {
+ setup_ns NS_A
+ ns_a="ip netns exec ${NS_A}"
+}
+
+setup_namespaces() {
+ local namespaces="";
+
+ NS_R1=""
+ NS_R2=""
+ NS_R3=""
+ for ns in ${ns_set}; do
+ n=$(nsname ${ns})
+ n=$(echo $n | tr '[:lower:]' '[:upper:]')
+ namespaces="$namespaces ${n}"
+ done
+
+ setup_ns $namespaces
+
+ ns_active= #ordered list of namespaces for this test.
+
+ [ -n NS_A ] && ns_a="ip netns exec ${NS_A}" && ns_active="${ns_active} $NS_A"
+ [ -n NS_R1 ] && ns_r1="ip netns exec ${NS_R1}" && ns_active="${ns_active} $NS_R1"
+ [ -n NS_S1 ] && ns_s1="ip netns exec ${NS_S1}" && ns_active="${ns_active} $NS_S1"
+ [ -n NS_R2 ] && ns_r2="ip netns exec ${NS_R2}" && ns_active="${ns_active} $NS_R2"
+ [ -n NS_S2 ] && ns_s2="ip netns exec ${NS_S2}" && ns_active="${ns_active} $NS_S2"
+ [ -n NS_R3 ] && ns_r3="ip netns exec ${NS_R3}" && ns_active="${ns_active} $NS_R3"
+ [ -n NS_B ] && ns_b="ip netns exec ${NS_B}" && ns_active="${ns_active} $NS_B"
+}
+
+setup_addr_add() {
+ local ns_cmd=$(nscmd $1)
+ local ip0="$2"
+ local ip1="$3"
+
+ if [ -n "${ip0}" ]; then
+ run_cmd ${ns_cmd} ip addr add ${ip0} dev eth0
+ run_cmd ${ns_cmd} ip link set up eth0
+ fi
+ if [ -n "${ip1}" ]; then
+ run_cmd ${ns_cmd} ip addr add ${ip1} dev eth1
+ run_cmd ${ns_cmd} ip link set up eth1
+ fi
+ run_cmd ${ns_cmd} sysctl -q net/ipv4/ip_forward=1
+ run_cmd ${ns_cmd} sysctl -q net/ipv6/conf/all/forwarding=1
+
+ # Disable DAD, so that we don't have to wait to use the
+ # configured IPv6 addresses
+ run_cmd ${ns_cmd} sysctl -q net/ipv6/conf/default/accept_dad=0
+}
+
+route_add() {
+ local ns_cmd=$(nscmd $1)
+ local nhf=$2
+ local nhr=$3
+ local i=$4
+
+ if [ -n "${nhf}" ]; then
+ # add forward routes
+ for j in $(seq $((i + 1)) $imax); do
+ local route="${prefix}${s}${j}${S}0/${prefix_len}"
+ run_cmd ${ns_cmd} ip route replace "${route} via ${nhf}"
+ done
+ fi
+
+ if [ -n "${nhr}" ]; then
+ # add reverse routes
+ for j in $(seq 1 $((i - 2))); do
+ local route="${prefix}${s}${j}${S}0/${prefix_len}"
+ run_cmd ${ns_cmd} ip route replace "${route} via ${nhr}"
+ done
+ fi
+}
+
+veth_add() {
+ local ns_cmd=$(nscmd $1)
+ local tn="veth${2}1"
+ local ln=${3:-eth0}
+ run_cmd ${ns_cmd} ip link add ${ln} type veth peer name ${tn}
+}
+
+setup_nft_add_icmp_filter() {
+ local ns_cmd=${ns_r2}
+
+ run_cmd ${ns_cmd} nft add table inet filter
+ run_cmd ${ns_cmd} nft add chain inet filter FORWARD \
+ { type filter hook forward priority filter\; policy drop \; }
+ run_cmd ${ns_cmd} nft add rule inet filter FORWARD counter ip protocol \
+ icmp counter log drop
+ run_cmd ${ns_cmd} nft add rule inet filter FORWARD counter ip protocol esp \
+ counter log accept
+}
+
+setup_nft_add_icmpv6_filter() {
+ local ns_cmd=${ns_r2}
+
+ run_cmd ${ns_cmd} nft add table inet filter
+ run_cmd ${ns_cmd} nft add chain inet filter FORWARD { type filter \
+ hook forward priority filter\; policy drop \; }
+ run_cmd ${ns_cmd} nft add rule inet filter FORWARD ip6 nexthdr \
+ ipv6-icmp icmpv6 type echo-request counter log drop
+ run_cmd ${ns_cmd} nft add rule inet filter FORWARD ip6 nexthdr esp \
+ counter log accept
+ run_cmd ${ns_cmd} nft add rule inet filter FORWARD ip6 nexthdr \
+ ipv6-icmp icmpv6 type {nd-neighbor-solicit,nd-neighbor-advert,\
+ nd-router-solicit,nd-router-advert} counter log accept
+}
+
+veth_mv() {
+ local ns=$1
+ local nsp=$2
+ local rn=${4:-eth1}
+ local tn="veth${3}1"
+
+ run_cmd "$(nscmd ${nsp})" ip link set ${tn} netns ${ns}
+ run_cmd "$(nscmd ${ns})" ip link set ${tn} name ${rn}
+}
+
+vm_set() {
+ s1_src=${src}
+ s1_dst=${dst}
+ s1_src_net=${src_net}
+ s1_dst_net=${dst_net}
+}
+
+setup_vm_set_v4() {
+ src="10.1.3.1"
+ dst="10.1.4.2"
+ src_net="10.1.1.0/24"
+ dst_net="10.1.6.0/24"
+
+ prefix=${prefix4}
+ prefix_len=24
+ s="."
+ S="."
+
+ vm_set
+}
+
+setup_vm_set_v4x() {
+ ns_set="a r1 s1 r2 s2 b" # Network topology: x
+ imax=6
+ prefix=${prefix4}
+ s="."
+ S="."
+ src="10.1.3.1"
+ dst="10.1.4.2"
+ src_net="10.1.1.0/24"
+ dst_net="10.1.5.0/24"
+ prefix_len=24
+
+ vm_set
+}
+
+setup_vm_set_v6() {
+ imax=7
+ prefix=${prefix6}
+ s=":"
+ S="::"
+ src="fc00:3::1"
+ dst="fc00:4::2"
+ src_net="fc00:1::0/64"
+ dst_net="fc00:6::0/64"
+ prefix_len=64
+
+ vm_set
+}
+
+setup_vm_set_v6x() {
+ ns_set="a r1 s1 r2 s2 b" # Network topology: x
+ imax=6
+ prefix=${prefix6}
+ s=":"
+ S="::"
+ src="fc00:3::1"
+ dst="fc00:4::2"
+ src_net="fc00:1::0/64"
+ dst_net="fc00:5::0/64"
+ prefix_len=64
+
+ vm_set
+}
+
+setup_veths() {
+ i=1
+ for ns in ${ns_active}; do
+ [ ${i} = ${imax} ] && continue
+ veth_add ${ns} ${i}
+ i=$((i + 1))
+ done
+
+ j=1
+ for ns in ${ns_active}; do
+ if [ ${j} -eq 1 ]; then
+ p=${ns};
+ pj=${j}
+ j=$((j + 1))
+ continue
+ fi
+ veth_mv ${ns} "${p}" ${pj}
+ p=${ns}
+ pj=${j}
+ j=$((j + 1))
+ done
+}
+
+setup_routes() {
+ ip1=""
+ i=1
+ for ns in ${ns_active}; do
+ # 10.1.C.1/24
+ ip0="${prefix}${s}${i}${S}1/${prefix_len}"
+ [ "${ns}" = b ] && ip0=""
+ setup_addr_add ${ns} "${ip0}" "${ip1}"
+ # 10.1.C.2/24
+ ip1="${prefix}${s}${i}${S}2/${prefix_len}"
+ i=$((i + 1))
+ done
+
+ i=1
+ nhr=""
+ for ns in ${ns_active}; do
+ nhf="${prefix}${s}${i}${S}2"
+ [ "${ns}" = b ] && nhf=""
+ route_add ${ns} "${nhf}" "${nhr}" ${i}
+ nhr="${prefix}${s}${i}${S}1"
+ i=$((i + 1))
+ done
+}
+
+setup_xfrm() {
+
+ run_cmd ${ns_s1} ip xfrm policy add src ${s1_src_net} dst ${s1_dst_net} dir out \
+ tmpl src ${s1_src} dst ${s1_dst} proto esp reqid 1 mode tunnel
+
+ # no "input" policies. we are only doing forwarding.
+ # run_cmd ${ns_s1} ip xfrm policy add src ${s1_dst_net} dst ${s1_src_net} dir in \
+ # flag icmp tmpl src ${s1_dst} dst ${s1_src} proto esp reqid 2 mode tunnel
+
+ run_cmd ${ns_s1} ip xfrm policy add src ${s1_dst_net} dst ${s1_src_net} dir fwd \
+ flag icmp tmpl src ${s1_dst} dst ${s1_src} proto esp reqid 2 mode tunnel
+
+ run_cmd ${ns_s1} ip xfrm state add src ${s1_src} dst ${s1_dst} proto esp spi 1 \
+ reqid 1 mode tunnel aead 'rfc4106(gcm(aes))' \
+ 0x1111111111111111111111111111111111111111 96 \
+ sel src ${s1_src_net} dst ${s1_dst_net}
+
+ run_cmd ${ns_s1} ip xfrm state add src ${s1_dst} dst ${s1_src} proto esp spi 2 \
+ reqid 2 flag icmp replay-window 8 mode tunnel aead 'rfc4106(gcm(aes))' \
+ 0x2222222222222222222222222222222222222222 96 \
+ sel src ${s1_dst_net} dst ${s1_src_net}
+
+ run_cmd ${ns_s2} ip xfrm policy add src ${s1_dst_net} dst ${s1_src_net} dir out \
+ flag icmp tmpl src ${s1_dst} dst ${s1_src} proto esp reqid 2 mode tunnel
+
+ run_cmd ${ns_s2} ip xfrm policy add src ${s1_src_net} dst ${s1_dst_net} dir fwd \
+ tmpl src ${s1_src} dst ${s1_dst} proto esp reqid 1 mode tunnel
+
+ run_cmd ${ns_s2} ip xfrm state add src ${s1_dst} dst ${s1_src} proto esp spi 2 \
+ reqid 2 mode tunnel aead 'rfc4106(gcm(aes))' \
+ 0x2222222222222222222222222222222222222222 96 \
+ sel src ${s1_dst_net} dst ${s1_src_net}
+
+ run_cmd ${ns_s2} ip xfrm state add src ${s1_src} dst ${s1_dst} proto esp spi 1 \
+ reqid 1 flag icmp replay-window 8 mode tunnel aead 'rfc4106(gcm(aes))' \
+ 0x1111111111111111111111111111111111111111 96 \
+ sel src ${s1_src_net} dst ${s1_dst_net}
+}
+
+setup() {
+ [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
+
+ for arg do
+ eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
+ done
+}
+
+trace() {
+ [ $TRACING -eq 0 ] && return
+
+ for arg do
+ [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
+ ns_cmd=
+ done
+ sleep 1
+}
+
+cleanup() {
+ if [ "${fail}" = "yes" -a -n "${desc}" ]; then
+ printf "TEST: %-60s [ FAIL ]\n" "${desc}"
+ [ -n "${cmd}" ] && echo -e "${cmd}\n"
+ [ -n "${out}" ] && echo -e "${out}\n"
+ fi
+
+ cleanup_all_ns
+}
+
+mtu() {
+ ns_cmd="${1}"
+ dev="${2}"
+ mtu="${3}"
+
+ ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
+}
+
+mtu_parse() {
+ input="${1}"
+
+ next=0
+ for i in ${input}; do
+ [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
+ [ ${next} -eq 1 ] && echo "${i}" && return
+ [ ${next} -eq 2 ] && echo "lock ${i}" && return
+ [ "${i}" = "mtu" ] && next=1
+ done
+}
+
+link_get() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ ${ns_cmd} ip link show dev "${name}"
+}
+
+link_get_mtu() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ mtu_parse "$(link_get "${ns_cmd}" ${name})"
+}
+
+test_unreachable_ipv6() {
+ setup vm_set_v6 namespaces veths routes xfrm nft_add_icmpv6_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:6::2
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:6::3 || true
+ rc=0
+ echo -e "$out" | grep -q -E 'From fc00:5::2 icmp_seq.* Destination' || rc=1
+ return ${rc}
+}
+
+test_unreachable_gw_ipv6() {
+ setup vm_set_v6x namespaces veths routes xfrm nft_add_icmpv6_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:5::2
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:5::3 || true
+ rc=0
+ echo -e "$out" | grep -q -E 'From fc00:4::2 icmp_seq.* Destination' || rc=1
+ return ${rc}
+}
+
+test_unreachable_gw_ipv4() {
+ setup vm_set_v4x namespaces veths routes xfrm nft_add_icmp_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.5.2
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.5.3 || true
+ rc=0
+ echo -e "$out" | grep -q -E 'From 10.1.4.2 icmp_seq.* Destination' || rc=1
+ return ${rc}
+}
+
+test_unreachable_ipv4() {
+ setup vm_set_v4 namespaces veths routes xfrm nft_add_icmp_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.6.2
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.6.3 || true
+ rc=0
+ echo -e "$out" | grep -q -E 'From 10.1.5.2 icmp_seq.* Destination' || rc=1
+ return ${rc}
+}
+
+test_mtu_ipv4_r2() {
+ setup vm_set_v4 namespaces veths routes xfrm nft_add_icmp_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.6.2
+ run_cmd ${ns_r2} ip route replace 10.1.3.0/24 dev eth1 src 10.1.3.2 mtu 1300
+ run_cmd ${ns_r2} ip route replace 10.1.4.0/24 dev eth0 src 10.1.4.1 mtu 1300
+ run_cmd ${ns_a} ping -M do -s 1300 -W 5 -w 4 -c 1 10.1.6.2 || true
+ rc=0
+ # note the error should be s1 not from r2
+ echo -e "$out" | grep -q -E "From 10.1.2.2 icmp_seq=.* Frag needed and DF set" || rc=1
+ return ${rc}
+}
+
+test_mtu_ipv6_r2() {
+ setup vm_set_v6 namespaces veths routes xfrm nft_add_icmpv6_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:6::2
+ run_cmd ${ns_r2} ip -6 route replace fc00:3::/64 dev eth1 metric 256 src fc00:3::2 mtu 1300
+ run_cmd ${ns_r2} ip -6 route replace fc00:4::/64 dev eth0 metric 256 src fc00:4::1 mtu 1300
+ run_cmd ${ns_a} ping -M do -s 1300 -W 5 -w 4 -c 1 fc00:6::2 || true
+ rc=0
+ # note the error should be s1 not from r2
+ echo -e "$out" | grep -q -E "From fc00:2::2 icmp_seq=.* Packet too big: mtu=1230" || rc=1
+ return ${rc}
+}
+
+test_mtu_ipv4_r3() {
+ setup vm_set_v4 namespaces veths routes xfrm nft_add_icmp_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 10.1.6.2
+ run_cmd ${ns_r3} ip route replace 10.1.6.0/24 dev eth0 src 10.1.6.1 mtu 1300
+ run_cmd ${ns_a} ping -M do -s 1350 -W 5 -w 4 -c 1 10.1.6.2 || true
+ rc=0
+ echo -e "$out" | grep -q -E "From 10.1.5.2 icmp_seq=.* Frag needed and DF set \(mtu = 1300\)" || rc=1
+ return ${rc}
+}
+
+test_mtu_ipv6_r3() {
+ setup vm_set_v6 namespaces veths routes xfrm nft_add_icmpv6_filter || return $ksft_skip
+ run_cmd ${ns_a} ping -W 5 -w 4 -c 1 fc00:6::2
+ run_cmd ${ns_r3} ip -6 route replace fc00:6::/64 dev eth1 metric 256 src fc00:6::1 mtu 1300
+ run_cmd ${ns_a} ping -M do -s 1300 -W 5 -w 4 -c 1 fc00:6::2 || true
+ rc=0
+ # note the error should be s1 not from r2
+ echo -e "$out" | grep -q -E "From fc00:5::2 icmp_seq=.* Packet too big: mtu=1300" || rc=1
+ return ${rc}
+}
+
+################################################################################
+#
+usage() {
+ echo
+ echo "$0 [OPTIONS] [TEST]..."
+ echo "If no TEST argument is given, all tests will be run."
+ echo
+ echo -e "\t-p Pause on fail"
+ echo -e "\t-v Verbose output. Show commands; -vv Show output also"
+ echo "Available tests${tests}"
+ exit 1
+}
+
+################################################################################
+#
+exitcode=0
+desc=0
+all_skipped=true
+out=
+cmd=
+
+while getopts :pv o
+do
+ case $o in
+ p) PAUSE_ON_FAIL=yes;;
+ v) VERBOSE=$(( VERBOSE + 1 ));;
+ *) usage;;
+ esac
+done
+shift $(($OPTIND-1))
+
+IFS="
+"
+
+for arg do
+ # Check first that all requested tests are available before running any
+ command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
+done
+
+trap cleanup EXIT
+
+name=""
+desc=""
+fail="no"
+
+# end cleanup
+cleanup
+
+for t in ${tests}; do
+ [ "${name}" = "" ] && name="${t}" && continue
+ [ "${desc}" = "" ] && desc="${t}"
+
+ run_this=1
+ for arg do
+ [ "${arg}" != "${arg#--*}" ] && continue
+ [ "${arg}" = "${name}" ] && run_this=1 && break
+ run_this=0
+ done
+ if [ $run_this -eq 1 ]; then
+ run_test "${name}" "${desc}"
+ fi
+ name=""
+ desc=""
+done
+
+exit ${exitcode}
--
2.30.2
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