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d68ff8ad33
Use 'set -e' and an exit handler to stop the script if a command fails
and ensure the test environment is cleaned up in any case. Also, handle
the case where the script is interrupted by SIGINT.
The only command that's expected to fail is 'wait $ping_pid', since
it's killed by the script. Handle this case with '|| true' to make it
play well with 'set -e'.
Finally, return the Kselftest SKIP code (4) when the script breaks
because of an environment problem or a command line failure. The 0 and
1 return codes should now reliably indicate that all tests have been
run (0: all tests run and passed, 1: all tests run but at least one
failed, 4: test script didn't run completely).
Fixes: b690842d12 ("selftests/net: test l2 tunnel TOS/TTL inheriting")
Reported-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Tested-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
447 lines
14 KiB
Bash
Executable File
447 lines
14 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# Author: Matthias May <matthias.may@westermo.com>
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#
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# This script evaluates ip tunnels that are capable of carrying L2 traffic
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# if they inherit or set the inheritable fields.
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# Namely these tunnels are: 'gretap', 'vxlan' and 'geneve'.
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# Checked inheritable fields are: TOS and TTL.
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# The outer tunnel protocol of 'IPv4' or 'IPv6' is verified-
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# As payload frames of type 'IPv4', 'IPv6' and 'other'(ARP) are verified.
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# In addition this script also checks if forcing a specific field in the
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# outer header is working.
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# Return 4 by default (Kselftest SKIP code)
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ERR=4
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if [ "$(id -u)" != "0" ]; then
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echo "Please run as root."
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exit $ERR
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fi
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if ! which tcpdump > /dev/null 2>&1; then
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echo "No tcpdump found. Required for this test."
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exit $ERR
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fi
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expected_tos="0x00"
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expected_ttl="0"
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failed=false
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readonly NS0=$(mktemp -u ns0-XXXXXXXX)
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readonly NS1=$(mktemp -u ns1-XXXXXXXX)
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RUN_NS0="ip netns exec ${NS0}"
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get_random_tos() {
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# Get a random hex tos value between 0x00 and 0xfc, a multiple of 4
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echo "0x$(tr -dc '0-9a-f' < /dev/urandom | head -c 1)\
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$(tr -dc '048c' < /dev/urandom | head -c 1)"
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}
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get_random_ttl() {
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# Get a random dec value between 0 and 255
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printf "%d" "0x$(tr -dc '0-9a-f' < /dev/urandom | head -c 2)"
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}
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get_field() {
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# Expects to get the 'head -n 1' of a captured frame by tcpdump.
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# Parses this first line and returns the specified field.
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local field="$1"
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local input="$2"
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local found=false
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input="$(echo "$input" | tr -d '(),')"
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for input_field in $input; do
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if $found; then
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echo "$input_field"
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return
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fi
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# The next field that we iterate over is the looked for value
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if [ "$input_field" = "$field" ]; then
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found=true
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fi
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done
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echo "0"
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}
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setup() {
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local type="$1"
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local outer="$2"
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local inner="$3"
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local tos_ttl="$4"
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local vlan="$5"
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local test_tos="0x00"
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local test_ttl="0"
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# We don't want a test-tos of 0x00,
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# because this is the value that we get when no tos is set.
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expected_tos="$(get_random_tos)"
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while [ "$expected_tos" = "0x00" ]; do
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expected_tos="$(get_random_tos)"
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done
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if [ "$tos_ttl" = "random" ]; then
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test_tos="$expected_tos"
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tos="fixed $test_tos"
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elif [ "$tos_ttl" = "inherit" ]; then
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test_tos="$tos_ttl"
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tos="inherit $expected_tos"
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fi
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# We don't want a test-ttl of 64 or 0,
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# because 64 is when no ttl is set and 0 is not a valid ttl.
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expected_ttl="$(get_random_ttl)"
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while [ "$expected_ttl" = "64" ] || [ "$expected_ttl" = "0" ]; do
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expected_ttl="$(get_random_ttl)"
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done
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if [ "$tos_ttl" = "random" ]; then
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test_ttl="$expected_ttl"
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ttl="fixed $test_ttl"
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elif [ "$tos_ttl" = "inherit" ]; then
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test_ttl="$tos_ttl"
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ttl="inherit $expected_ttl"
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fi
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printf "│%7s │%6s │%6s │%13s │%13s │%6s │" \
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"$type" "$outer" "$inner" "$tos" "$ttl" "$vlan"
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# Create netns NS0 and NS1 and connect them with a veth pair
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ip netns add "${NS0}"
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ip netns add "${NS1}"
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ip link add name veth0 netns "${NS0}" type veth \
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peer name veth1 netns "${NS1}"
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ip -netns "${NS0}" link set dev veth0 up
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ip -netns "${NS1}" link set dev veth1 up
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ip -netns "${NS0}" address flush dev veth0
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ip -netns "${NS1}" address flush dev veth1
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local local_addr1=""
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local local_addr2=""
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if [ "$type" = "gre" ] || [ "$type" = "vxlan" ]; then
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if [ "$outer" = "4" ]; then
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local_addr1="local 198.18.0.1"
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local_addr2="local 198.18.0.2"
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elif [ "$outer" = "6" ]; then
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local_addr1="local fdd1:ced0:5d88:3fce::1"
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local_addr2="local fdd1:ced0:5d88:3fce::2"
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fi
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fi
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local vxlan=""
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if [ "$type" = "vxlan" ]; then
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vxlan="vni 100 dstport 4789"
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fi
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local geneve=""
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if [ "$type" = "geneve" ]; then
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geneve="vni 100"
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fi
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# Create tunnel and assign outer IPv4/IPv6 addresses
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if [ "$outer" = "4" ]; then
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if [ "$type" = "gre" ]; then
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type="gretap"
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fi
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ip -netns "${NS0}" address add 198.18.0.1/24 dev veth0
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ip -netns "${NS1}" address add 198.18.0.2/24 dev veth1
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ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
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remote 198.18.0.2 tos $test_tos ttl $test_ttl \
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$vxlan $geneve
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ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
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remote 198.18.0.1 tos $test_tos ttl $test_ttl \
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$vxlan $geneve
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elif [ "$outer" = "6" ]; then
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if [ "$type" = "gre" ]; then
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type="ip6gretap"
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fi
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ip -netns "${NS0}" address add fdd1:ced0:5d88:3fce::1/64 \
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dev veth0 nodad
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ip -netns "${NS1}" address add fdd1:ced0:5d88:3fce::2/64 \
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dev veth1 nodad
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ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
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remote fdd1:ced0:5d88:3fce::2 tos $test_tos \
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ttl $test_ttl $vxlan $geneve
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ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
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remote fdd1:ced0:5d88:3fce::1 tos $test_tos \
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ttl $test_ttl $vxlan $geneve
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fi
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# Bring L2-tunnel link up and create VLAN on top
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ip -netns "${NS0}" link set tep0 up
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ip -netns "${NS1}" link set tep1 up
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ip -netns "${NS0}" address flush dev tep0
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ip -netns "${NS1}" address flush dev tep1
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local parent
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if $vlan; then
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parent="vlan99-"
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ip -netns "${NS0}" link add link tep0 name ${parent}0 \
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type vlan id 99
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ip -netns "${NS1}" link add link tep1 name ${parent}1 \
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type vlan id 99
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ip -netns "${NS0}" link set dev ${parent}0 up
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ip -netns "${NS1}" link set dev ${parent}1 up
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ip -netns "${NS0}" address flush dev ${parent}0
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ip -netns "${NS1}" address flush dev ${parent}1
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else
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parent="tep"
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fi
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# Assign inner IPv4/IPv6 addresses
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if [ "$inner" = "4" ] || [ "$inner" = "other" ]; then
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ip -netns "${NS0}" address add 198.19.0.1/24 brd + dev ${parent}0
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ip -netns "${NS1}" address add 198.19.0.2/24 brd + dev ${parent}1
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elif [ "$inner" = "6" ]; then
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ip -netns "${NS0}" address add fdd4:96cf:4eae:443b::1/64 \
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dev ${parent}0 nodad
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ip -netns "${NS1}" address add fdd4:96cf:4eae:443b::2/64 \
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dev ${parent}1 nodad
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fi
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}
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verify() {
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local outer="$1"
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local inner="$2"
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local tos_ttl="$3"
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local vlan="$4"
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local ping_pid out captured_tos captured_ttl result
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local ping_dst
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if [ "$inner" = "4" ]; then
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ping_dst="198.19.0.2"
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elif [ "$inner" = "6" ]; then
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ping_dst="fdd4:96cf:4eae:443b::2"
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elif [ "$inner" = "other" ]; then
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ping_dst="198.19.0.3" # Generates ARPs which are not IPv4/IPv6
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fi
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if [ "$tos_ttl" = "inherit" ]; then
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${RUN_NS0} ping -i 0.1 $ping_dst -Q "$expected_tos" \
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-t "$expected_ttl" 2>/dev/null 1>&2 & ping_pid="$!"
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else
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${RUN_NS0} ping -i 0.1 $ping_dst 2>/dev/null 1>&2 & ping_pid="$!"
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fi
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local tunnel_type_offset tunnel_type_proto req_proto_offset req_offset
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if [ "$type" = "gre" ]; then
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tunnel_type_proto="0x2f"
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elif [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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tunnel_type_proto="0x11"
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fi
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if [ "$outer" = "4" ]; then
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tunnel_type_offset="9"
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if [ "$inner" = "4" ]; then
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req_proto_offset="47"
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req_offset="58"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 12))"
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req_offset="$((req_offset + 12))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip[$tunnel_type_offset] = $tunnel_type_proto and \
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ip[$req_proto_offset] = 0x01 and \
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ip[$req_offset] = 0x08 2>/dev/null \
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| head -n 1)"
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elif [ "$inner" = "6" ]; then
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req_proto_offset="44"
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req_offset="78"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 12))"
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req_offset="$((req_offset + 12))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip[$tunnel_type_offset] = $tunnel_type_proto and \
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ip[$req_proto_offset] = 0x3a and \
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ip[$req_offset] = 0x80 2>/dev/null \
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| head -n 1)"
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elif [ "$inner" = "other" ]; then
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req_proto_offset="36"
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req_offset="45"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 12))"
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req_offset="$((req_offset + 12))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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if [ "$tos_ttl" = "inherit" ]; then
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expected_tos="0x00"
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expected_ttl="64"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip[$tunnel_type_offset] = $tunnel_type_proto and \
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ip[$req_proto_offset] = 0x08 and \
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ip[$((req_proto_offset + 1))] = 0x06 and \
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ip[$req_offset] = 0x01 2>/dev/null \
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| head -n 1)"
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fi
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elif [ "$outer" = "6" ]; then
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if [ "$type" = "gre" ]; then
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tunnel_type_offset="40"
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elif [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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tunnel_type_offset="6"
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fi
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if [ "$inner" = "4" ]; then
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local req_proto_offset="75"
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local req_offset="86"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip6[$tunnel_type_offset] = $tunnel_type_proto and \
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ip6[$req_proto_offset] = 0x01 and \
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ip6[$req_offset] = 0x08 2>/dev/null \
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| head -n 1)"
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elif [ "$inner" = "6" ]; then
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local req_proto_offset="72"
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local req_offset="106"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip6[$tunnel_type_offset] = $tunnel_type_proto and \
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ip6[$req_proto_offset] = 0x3a and \
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ip6[$req_offset] = 0x80 2>/dev/null \
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| head -n 1)"
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elif [ "$inner" = "other" ]; then
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local req_proto_offset="64"
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local req_offset="73"
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if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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if $vlan; then
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req_proto_offset="$((req_proto_offset + 4))"
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req_offset="$((req_offset + 4))"
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fi
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if [ "$tos_ttl" = "inherit" ]; then
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expected_tos="0x00"
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expected_ttl="64"
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fi
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out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
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-i veth0 -n \
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ip6[$tunnel_type_offset] = $tunnel_type_proto and \
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ip6[$req_proto_offset] = 0x08 and \
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ip6[$((req_proto_offset + 1))] = 0x06 and \
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ip6[$req_offset] = 0x01 2>/dev/null \
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| head -n 1)"
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fi
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fi
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kill -9 $ping_pid
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wait $ping_pid 2>/dev/null || true
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result="FAIL"
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if [ "$outer" = "4" ]; then
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captured_ttl="$(get_field "ttl" "$out")"
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captured_tos="$(printf "0x%02x" "$(get_field "tos" "$out")")"
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if [ "$captured_tos" = "$expected_tos" ] &&
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[ "$captured_ttl" = "$expected_ttl" ]; then
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result="OK"
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fi
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elif [ "$outer" = "6" ]; then
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captured_ttl="$(get_field "hlim" "$out")"
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captured_tos="$(printf "0x%02x" "$(get_field "class" "$out")")"
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if [ "$captured_tos" = "$expected_tos" ] &&
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[ "$captured_ttl" = "$expected_ttl" ]; then
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result="OK"
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fi
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fi
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printf "%7s │\n" "$result"
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if [ "$result" = "FAIL" ]; then
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failed=true
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if [ "$captured_tos" != "$expected_tos" ]; then
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printf "│%43s%27s │\n" \
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"Expected TOS value: $expected_tos" \
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"Captured TOS value: $captured_tos"
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fi
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if [ "$captured_ttl" != "$expected_ttl" ]; then
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printf "│%43s%27s │\n" \
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"Expected TTL value: $expected_ttl" \
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"Captured TTL value: $captured_ttl"
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fi
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printf "│%71s│\n" " "
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fi
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}
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cleanup() {
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ip netns del "${NS0}" 2>/dev/null
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ip netns del "${NS1}" 2>/dev/null
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}
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exit_handler() {
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# Don't exit immediately if one of the intermediate commands fails.
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# We might be called at the end of the script, when the network
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# namespaces have already been deleted. So cleanup() may fail, but we
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# still need to run until 'exit $ERR' or the script won't return the
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# correct error code.
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set +e
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cleanup
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exit $ERR
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}
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# Restore the default SIGINT handler (just in case) and exit.
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# The exit handler will take care of cleaning everything up.
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interrupted() {
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trap - INT
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exit $ERR
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}
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set -e
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trap exit_handler EXIT
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trap interrupted INT
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printf "┌────────┬───────┬───────┬──────────────┬"
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printf "──────────────┬───────┬────────┐\n"
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for type in gre vxlan geneve; do
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if ! $(modprobe "$type" 2>/dev/null); then
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continue
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fi
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for outer in 4 6; do
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printf "├────────┼───────┼───────┼──────────────┼"
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printf "──────────────┼───────┼────────┤\n"
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printf "│ Type │ outer | inner │ tos │"
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printf " ttl │ vlan │ result │\n"
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for inner in 4 6 other; do
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printf "├────────┼───────┼───────┼──────────────┼"
|
|
printf "──────────────┼───────┼────────┤\n"
|
|
for tos_ttl in inherit random; do
|
|
for vlan in false true; do
|
|
setup "$type" "$outer" "$inner" \
|
|
"$tos_ttl" "$vlan"
|
|
verify "$outer" "$inner" "$tos_ttl" \
|
|
"$vlan"
|
|
cleanup
|
|
done
|
|
done
|
|
done
|
|
done
|
|
done
|
|
printf "└────────┴───────┴───────┴──────────────┴"
|
|
printf "──────────────┴───────┴────────┘\n"
|
|
|
|
# All tests done.
|
|
# Set ERR appropriately: it will be returned by the exit handler.
|
|
if $failed; then
|
|
ERR=1
|
|
else
|
|
ERR=0
|
|
fi
|