| Current File : //proc/self/root/usr/src/linux-headers-6.8.0-60/tools/testing/selftests/net/l2_tos_ttl_inherit.sh |
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Author: Matthias May <matthias.may@westermo.com>
#
# This script evaluates ip tunnels that are capable of carrying L2 traffic
# if they inherit or set the inheritable fields.
# Namely these tunnels are: 'gretap', 'vxlan' and 'geneve'.
# Checked inheritable fields are: TOS and TTL.
# The outer tunnel protocol of 'IPv4' or 'IPv6' is verified-
# As payload frames of type 'IPv4', 'IPv6' and 'other'(ARP) are verified.
# In addition this script also checks if forcing a specific field in the
# outer header is working.
# Return 4 by default (Kselftest SKIP code)
ERR=4
if [ "$(id -u)" != "0" ]; then
echo "Please run as root."
exit $ERR
fi
if ! which tcpdump > /dev/null 2>&1; then
echo "No tcpdump found. Required for this test."
exit $ERR
fi
expected_tos="0x00"
expected_ttl="0"
failed=false
readonly NS0=$(mktemp -u ns0-XXXXXXXX)
readonly NS1=$(mktemp -u ns1-XXXXXXXX)
RUN_NS0="ip netns exec ${NS0}"
get_random_tos() {
# Get a random hex tos value between 0x00 and 0xfc, a multiple of 4
echo "0x$(tr -dc '0-9a-f' < /dev/urandom | head -c 1)\
$(tr -dc '048c' < /dev/urandom | head -c 1)"
}
get_random_ttl() {
# Get a random dec value between 0 and 255
printf "%d" "0x$(tr -dc '0-9a-f' < /dev/urandom | head -c 2)"
}
get_field() {
# Expects to get the 'head -n 1' of a captured frame by tcpdump.
# Parses this first line and returns the specified field.
local field="$1"
local input="$2"
local found=false
input="$(echo "$input" | tr -d '(),')"
for input_field in $input; do
if $found; then
echo "$input_field"
return
fi
# The next field that we iterate over is the looked for value
if [ "$input_field" = "$field" ]; then
found=true
fi
done
echo "0"
}
setup() {
local type="$1"
local outer="$2"
local inner="$3"
local tos_ttl="$4"
local vlan="$5"
local test_tos="0x00"
local test_ttl="0"
# We don't want a test-tos of 0x00,
# because this is the value that we get when no tos is set.
expected_tos="$(get_random_tos)"
while [ "$expected_tos" = "0x00" ]; do
expected_tos="$(get_random_tos)"
done
if [ "$tos_ttl" = "random" ]; then
test_tos="$expected_tos"
tos="fixed $test_tos"
elif [ "$tos_ttl" = "inherit" ]; then
test_tos="$tos_ttl"
tos="inherit $expected_tos"
fi
# We don't want a test-ttl of 64 or 0,
# because 64 is when no ttl is set and 0 is not a valid ttl.
expected_ttl="$(get_random_ttl)"
while [ "$expected_ttl" = "64" ] || [ "$expected_ttl" = "0" ]; do
expected_ttl="$(get_random_ttl)"
done
if [ "$tos_ttl" = "random" ]; then
test_ttl="$expected_ttl"
ttl="fixed $test_ttl"
elif [ "$tos_ttl" = "inherit" ]; then
test_ttl="$tos_ttl"
ttl="inherit $expected_ttl"
fi
printf "│%7s │%6s │%6s │%13s │%13s │%6s │" \
"$type" "$outer" "$inner" "$tos" "$ttl" "$vlan"
# Create netns NS0 and NS1 and connect them with a veth pair
ip netns add "${NS0}"
ip netns add "${NS1}"
ip link add name veth0 netns "${NS0}" type veth \
peer name veth1 netns "${NS1}"
ip -netns "${NS0}" link set dev veth0 up
ip -netns "${NS1}" link set dev veth1 up
ip -netns "${NS0}" address flush dev veth0
ip -netns "${NS1}" address flush dev veth1
local local_addr1=""
local local_addr2=""
if [ "$type" = "gre" ] || [ "$type" = "vxlan" ]; then
if [ "$outer" = "4" ]; then
local_addr1="local 198.18.0.1"
local_addr2="local 198.18.0.2"
elif [ "$outer" = "6" ]; then
local_addr1="local fdd1:ced0:5d88:3fce::1"
local_addr2="local fdd1:ced0:5d88:3fce::2"
fi
fi
local vxlan=""
if [ "$type" = "vxlan" ]; then
vxlan="vni 100 dstport 4789"
fi
local geneve=""
if [ "$type" = "geneve" ]; then
geneve="vni 100"
fi
# Create tunnel and assign outer IPv4/IPv6 addresses
if [ "$outer" = "4" ]; then
if [ "$type" = "gre" ]; then
type="gretap"
fi
ip -netns "${NS0}" address add 198.18.0.1/24 dev veth0
ip -netns "${NS1}" address add 198.18.0.2/24 dev veth1
ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
remote 198.18.0.2 tos $test_tos ttl $test_ttl \
$vxlan $geneve
ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
remote 198.18.0.1 tos $test_tos ttl $test_ttl \
$vxlan $geneve
elif [ "$outer" = "6" ]; then
if [ "$type" = "gre" ]; then
type="ip6gretap"
fi
ip -netns "${NS0}" address add fdd1:ced0:5d88:3fce::1/64 \
dev veth0 nodad
ip -netns "${NS1}" address add fdd1:ced0:5d88:3fce::2/64 \
dev veth1 nodad
ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
remote fdd1:ced0:5d88:3fce::2 tos $test_tos \
ttl $test_ttl $vxlan $geneve
ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
remote fdd1:ced0:5d88:3fce::1 tos $test_tos \
ttl $test_ttl $vxlan $geneve
fi
# Bring L2-tunnel link up and create VLAN on top
ip -netns "${NS0}" link set tep0 up
ip -netns "${NS1}" link set tep1 up
ip -netns "${NS0}" address flush dev tep0
ip -netns "${NS1}" address flush dev tep1
local parent
if $vlan; then
parent="vlan99-"
ip -netns "${NS0}" link add link tep0 name ${parent}0 \
type vlan id 99
ip -netns "${NS1}" link add link tep1 name ${parent}1 \
type vlan id 99
ip -netns "${NS0}" link set dev ${parent}0 up
ip -netns "${NS1}" link set dev ${parent}1 up
ip -netns "${NS0}" address flush dev ${parent}0
ip -netns "${NS1}" address flush dev ${parent}1
else
parent="tep"
fi
# Assign inner IPv4/IPv6 addresses
if [ "$inner" = "4" ] || [ "$inner" = "other" ]; then
ip -netns "${NS0}" address add 198.19.0.1/24 brd + dev ${parent}0
ip -netns "${NS1}" address add 198.19.0.2/24 brd + dev ${parent}1
elif [ "$inner" = "6" ]; then
ip -netns "${NS0}" address add fdd4:96cf:4eae:443b::1/64 \
dev ${parent}0 nodad
ip -netns "${NS1}" address add fdd4:96cf:4eae:443b::2/64 \
dev ${parent}1 nodad
fi
}
verify() {
local outer="$1"
local inner="$2"
local tos_ttl="$3"
local vlan="$4"
local ping_pid out captured_tos captured_ttl result
local ping_dst
if [ "$inner" = "4" ]; then
ping_dst="198.19.0.2"
elif [ "$inner" = "6" ]; then
ping_dst="fdd4:96cf:4eae:443b::2"
elif [ "$inner" = "other" ]; then
ping_dst="198.19.0.3" # Generates ARPs which are not IPv4/IPv6
fi
if [ "$tos_ttl" = "inherit" ]; then
${RUN_NS0} ping -i 0.1 $ping_dst -Q "$expected_tos" \
-t "$expected_ttl" 2>/dev/null 1>&2 & ping_pid="$!"
else
${RUN_NS0} ping -i 0.1 $ping_dst 2>/dev/null 1>&2 & ping_pid="$!"
fi
local tunnel_type_offset tunnel_type_proto req_proto_offset req_offset
if [ "$type" = "gre" ]; then
tunnel_type_proto="0x2f"
elif [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
tunnel_type_proto="0x11"
fi
if [ "$outer" = "4" ]; then
tunnel_type_offset="9"
if [ "$inner" = "4" ]; then
req_proto_offset="47"
req_offset="58"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 12))"
req_offset="$((req_offset + 12))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x01 and \
ip[$req_offset] = 0x08 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "6" ]; then
req_proto_offset="44"
req_offset="78"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 12))"
req_offset="$((req_offset + 12))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x3a and \
ip[$req_offset] = 0x80 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "other" ]; then
req_proto_offset="36"
req_offset="45"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 12))"
req_offset="$((req_offset + 12))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
if [ "$tos_ttl" = "inherit" ]; then
expected_tos="0x00"
expected_ttl="64"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x08 and \
ip[$((req_proto_offset + 1))] = 0x06 and \
ip[$req_offset] = 0x01 2>/dev/null \
| head -n 1)"
fi
elif [ "$outer" = "6" ]; then
if [ "$type" = "gre" ]; then
tunnel_type_offset="40"
elif [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
tunnel_type_offset="6"
fi
if [ "$inner" = "4" ]; then
local req_proto_offset="75"
local req_offset="86"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x01 and \
ip6[$req_offset] = 0x08 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "6" ]; then
local req_proto_offset="72"
local req_offset="106"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x3a and \
ip6[$req_offset] = 0x80 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "other" ]; then
local req_proto_offset="64"
local req_offset="73"
if [ "$type" = "vxlan" ] || [ "$type" = "geneve" ]; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
if $vlan; then
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
if [ "$tos_ttl" = "inherit" ]; then
expected_tos="0x00"
expected_ttl="64"
fi
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x08 and \
ip6[$((req_proto_offset + 1))] = 0x06 and \
ip6[$req_offset] = 0x01 2>/dev/null \
| head -n 1)"
fi
fi
kill -9 $ping_pid
wait $ping_pid 2>/dev/null || true
result="FAIL"
if [ "$outer" = "4" ]; then
captured_ttl="$(get_field "ttl" "$out")"
captured_tos="$(printf "0x%02x" "$(get_field "tos" "$out")")"
if [ "$captured_tos" = "$expected_tos" ] &&
[ "$captured_ttl" = "$expected_ttl" ]; then
result="OK"
fi
elif [ "$outer" = "6" ]; then
captured_ttl="$(get_field "hlim" "$out")"
captured_tos="$(printf "0x%02x" "$(get_field "class" "$out")")"
if [ "$captured_tos" = "$expected_tos" ] &&
[ "$captured_ttl" = "$expected_ttl" ]; then
result="OK"
fi
fi
printf "%7s │\n" "$result"
if [ "$result" = "FAIL" ]; then
failed=true
if [ "$captured_tos" != "$expected_tos" ]; then
printf "│%43s%27s │\n" \
"Expected TOS value: $expected_tos" \
"Captured TOS value: $captured_tos"
fi
if [ "$captured_ttl" != "$expected_ttl" ]; then
printf "│%43s%27s │\n" \
"Expected TTL value: $expected_ttl" \
"Captured TTL value: $captured_ttl"
fi
printf "│%71s│\n" " "
fi
}
cleanup() {
ip netns del "${NS0}" 2>/dev/null
ip netns del "${NS1}" 2>/dev/null
}
exit_handler() {
# Don't exit immediately if one of the intermediate commands fails.
# We might be called at the end of the script, when the network
# namespaces have already been deleted. So cleanup() may fail, but we
# still need to run until 'exit $ERR' or the script won't return the
# correct error code.
set +e
cleanup
exit $ERR
}
# Restore the default SIGINT handler (just in case) and exit.
# The exit handler will take care of cleaning everything up.
interrupted() {
trap - INT
exit $ERR
}
set -e
trap exit_handler EXIT
trap interrupted INT
printf "┌────────┬───────┬───────┬──────────────┬"
printf "──────────────┬───────┬────────┐\n"
for type in gre vxlan geneve; do
if ! $(modprobe "$type" 2>/dev/null); then
continue
fi
for outer in 4 6; do
printf "├────────┼───────┼───────┼──────────────┼"
printf "──────────────┼───────┼────────┤\n"
printf "│ Type │ outer | inner │ tos │"
printf " ttl │ vlan │ result │\n"
for inner in 4 6 other; do
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