diff options
Diffstat (limited to 'tools/testing/selftests/netfilter/nft_flowtable.sh')
-rwxr-xr-x | tools/testing/selftests/netfilter/nft_flowtable.sh | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/tools/testing/selftests/netfilter/nft_flowtable.sh b/tools/testing/selftests/netfilter/nft_flowtable.sh new file mode 100755 index 000000000..7060bae04 --- /dev/null +++ b/tools/testing/selftests/netfilter/nft_flowtable.sh @@ -0,0 +1,539 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# This tests basic flowtable functionality. +# Creates following default topology: +# +# Originator (MTU 9000) <-Router1-> MTU 1500 <-Router2-> Responder (MTU 2000) +# Router1 is the one doing flow offloading, Router2 has no special +# purpose other than having a link that is smaller than either Originator +# and responder, i.e. TCPMSS announced values are too large and will still +# result in fragmentation and/or PMTU discovery. +# +# You can check with different Orgininator/Link/Responder MTU eg: +# nft_flowtable.sh -o8000 -l1500 -r2000 +# + +sfx=$(mktemp -u "XXXXXXXX") +ns1="ns1-$sfx" +ns2="ns2-$sfx" +nsr1="nsr1-$sfx" +nsr2="nsr2-$sfx" + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 +ret=0 + +nsin="" +ns1out="" +ns2out="" + +log_netns=$(sysctl -n net.netfilter.nf_log_all_netns) + +checktool (){ + if ! $1 > /dev/null 2>&1; then + echo "SKIP: Could not $2" + exit $ksft_skip + fi +} + +checktool "nft --version" "run test without nft tool" +checktool "ip -Version" "run test without ip tool" +checktool "which nc" "run test without nc (netcat)" +checktool "ip netns add $nsr1" "create net namespace $nsr1" + +ip netns add $ns1 +ip netns add $ns2 +ip netns add $nsr2 + +cleanup() { + ip netns del $ns1 + ip netns del $ns2 + ip netns del $nsr1 + ip netns del $nsr2 + + rm -f "$nsin" "$ns1out" "$ns2out" + + [ $log_netns -eq 0 ] && sysctl -q net.netfilter.nf_log_all_netns=$log_netns +} + +trap cleanup EXIT + +sysctl -q net.netfilter.nf_log_all_netns=1 + +ip link add veth0 netns $nsr1 type veth peer name eth0 netns $ns1 +ip link add veth1 netns $nsr1 type veth peer name veth0 netns $nsr2 + +ip link add veth1 netns $nsr2 type veth peer name eth0 netns $ns2 + +for dev in lo veth0 veth1; do + ip -net $nsr1 link set $dev up + ip -net $nsr2 link set $dev up +done + +ip -net $nsr1 addr add 10.0.1.1/24 dev veth0 +ip -net $nsr1 addr add dead:1::1/64 dev veth0 + +ip -net $nsr2 addr add 10.0.2.1/24 dev veth1 +ip -net $nsr2 addr add dead:2::1/64 dev veth1 + +# set different MTUs so we need to push packets coming from ns1 (large MTU) +# to ns2 (smaller MTU) to stack either to perform fragmentation (ip_no_pmtu_disc=1), +# or to do PTMU discovery (send ICMP error back to originator). +# ns2 is going via nsr2 with a smaller mtu, so that TCPMSS announced by both peers +# is NOT the lowest link mtu. + +omtu=9000 +lmtu=1500 +rmtu=2000 + +usage(){ + echo "nft_flowtable.sh [OPTIONS]" + echo + echo "MTU options" + echo " -o originator" + echo " -l link" + echo " -r responder" + exit 1 +} + +while getopts "o:l:r:" o +do + case $o in + o) omtu=$OPTARG;; + l) lmtu=$OPTARG;; + r) rmtu=$OPTARG;; + *) usage;; + esac +done + +if ! ip -net $nsr1 link set veth0 mtu $omtu; then + exit 1 +fi + +ip -net $ns1 link set eth0 mtu $omtu + +if ! ip -net $nsr2 link set veth1 mtu $rmtu; then + exit 1 +fi + +ip -net $ns2 link set eth0 mtu $rmtu + +# transfer-net between nsr1 and nsr2. +# these addresses are not used for connections. +ip -net $nsr1 addr add 192.168.10.1/24 dev veth1 +ip -net $nsr1 addr add fee1:2::1/64 dev veth1 + +ip -net $nsr2 addr add 192.168.10.2/24 dev veth0 +ip -net $nsr2 addr add fee1:2::2/64 dev veth0 + +for i in 0 1; do + ip netns exec $nsr1 sysctl net.ipv4.conf.veth$i.forwarding=1 > /dev/null + ip netns exec $nsr2 sysctl net.ipv4.conf.veth$i.forwarding=1 > /dev/null +done + +for ns in $ns1 $ns2;do + ip -net $ns link set lo up + ip -net $ns link set eth0 up + + if ! ip netns exec $ns sysctl net.ipv4.tcp_no_metrics_save=1 > /dev/null; then + echo "ERROR: Check Originator/Responder values (problem during address addition)" + exit 1 + fi + # don't set ip DF bit for first two tests + ip netns exec $ns sysctl net.ipv4.ip_no_pmtu_disc=1 > /dev/null +done + +ip -net $ns1 addr add 10.0.1.99/24 dev eth0 +ip -net $ns2 addr add 10.0.2.99/24 dev eth0 +ip -net $ns1 route add default via 10.0.1.1 +ip -net $ns2 route add default via 10.0.2.1 +ip -net $ns1 addr add dead:1::99/64 dev eth0 +ip -net $ns2 addr add dead:2::99/64 dev eth0 +ip -net $ns1 route add default via dead:1::1 +ip -net $ns2 route add default via dead:2::1 + +ip -net $nsr1 route add default via 192.168.10.2 +ip -net $nsr2 route add default via 192.168.10.1 + +ip netns exec $nsr1 nft -f - <<EOF +table inet filter { + flowtable f1 { + hook ingress priority 0 + devices = { veth0, veth1 } + } + + counter routed_orig { } + counter routed_repl { } + + chain forward { + type filter hook forward priority 0; policy drop; + + # flow offloaded? Tag ct with mark 1, so we can detect when it fails. + meta oif "veth1" tcp dport 12345 ct mark set 1 flow add @f1 counter name routed_orig accept + + # count packets supposedly offloaded as per direction. + ct mark 1 counter name ct direction map { original : routed_orig, reply : routed_repl } accept + + ct state established,related accept + + meta nfproto ipv4 meta l4proto icmp accept + meta nfproto ipv6 meta l4proto icmpv6 accept + } +} +EOF + +if [ $? -ne 0 ]; then + echo "SKIP: Could not load nft ruleset" + exit $ksft_skip +fi + +# test basic connectivity +if ! ip netns exec $ns1 ping -c 1 -q 10.0.2.99 > /dev/null; then + echo "ERROR: $ns1 cannot reach ns2" 1>&2 + exit 1 +fi + +if ! ip netns exec $ns2 ping -c 1 -q 10.0.1.99 > /dev/null; then + echo "ERROR: $ns2 cannot reach $ns1" 1>&2 + exit 1 +fi + +if [ $ret -eq 0 ];then + echo "PASS: netns routing/connectivity: $ns1 can reach $ns2" +fi + +nsin=$(mktemp) +ns1out=$(mktemp) +ns2out=$(mktemp) + +make_file() +{ + name=$1 + + SIZE=$((RANDOM % (1024 * 128))) + SIZE=$((SIZE + (1024 * 8))) + TSIZE=$((SIZE * 1024)) + + dd if=/dev/urandom of="$name" bs=1024 count=$SIZE 2> /dev/null + + SIZE=$((RANDOM % 1024)) + SIZE=$((SIZE + 128)) + TSIZE=$((TSIZE + SIZE)) + dd if=/dev/urandom conf=notrunc of="$name" bs=1 count=$SIZE 2> /dev/null +} + +check_counters() +{ + local what=$1 + local ok=1 + + local orig=$(ip netns exec $nsr1 nft reset counter inet filter routed_orig | grep packets) + local repl=$(ip netns exec $nsr1 nft reset counter inet filter routed_repl | grep packets) + + local orig_cnt=${orig#*bytes} + local repl_cnt=${repl#*bytes} + + local fs=$(du -sb $nsin) + local max_orig=${fs%%/*} + local max_repl=$((max_orig/4)) + + if [ $orig_cnt -gt $max_orig ];then + echo "FAIL: $what: original counter $orig_cnt exceeds expected value $max_orig" 1>&2 + ret=1 + ok=0 + fi + + if [ $repl_cnt -gt $max_repl ];then + echo "FAIL: $what: reply counter $repl_cnt exceeds expected value $max_repl" 1>&2 + ret=1 + ok=0 + fi + + if [ $ok -eq 1 ]; then + echo "PASS: $what" + fi +} + +check_transfer() +{ + in=$1 + out=$2 + what=$3 + + if ! cmp "$in" "$out" > /dev/null 2>&1; then + echo "FAIL: file mismatch for $what" 1>&2 + ls -l "$in" + ls -l "$out" + return 1 + fi + + return 0 +} + +test_tcp_forwarding_ip() +{ + local nsa=$1 + local nsb=$2 + local dstip=$3 + local dstport=$4 + local lret=0 + + ip netns exec $nsb nc -w 5 -l -p 12345 < "$nsin" > "$ns2out" & + lpid=$! + + sleep 1 + ip netns exec $nsa nc -w 4 "$dstip" "$dstport" < "$nsin" > "$ns1out" & + cpid=$! + + sleep 3 + + if ps -p $lpid > /dev/null;then + kill $lpid + fi + + if ps -p $cpid > /dev/null;then + kill $cpid + fi + + wait + + if ! check_transfer "$nsin" "$ns2out" "ns1 -> ns2"; then + lret=1 + fi + + if ! check_transfer "$nsin" "$ns1out" "ns1 <- ns2"; then + lret=1 + fi + + return $lret +} + +test_tcp_forwarding() +{ + test_tcp_forwarding_ip "$1" "$2" 10.0.2.99 12345 + + return $? +} + +test_tcp_forwarding_nat() +{ + local lret + local pmtu + + test_tcp_forwarding_ip "$1" "$2" 10.0.2.99 12345 + lret=$? + + pmtu=$3 + what=$4 + + if [ $lret -eq 0 ] ; then + if [ $pmtu -eq 1 ] ;then + check_counters "flow offload for ns1/ns2 with masquerade and pmtu discovery $what" + else + echo "PASS: flow offload for ns1/ns2 with masquerade $what" + fi + + test_tcp_forwarding_ip "$1" "$2" 10.6.6.6 1666 + lret=$? + if [ $pmtu -eq 1 ] ;then + check_counters "flow offload for ns1/ns2 with dnat and pmtu discovery $what" + elif [ $lret -eq 0 ] ; then + echo "PASS: flow offload for ns1/ns2 with dnat $what" + fi + fi + + return $lret +} + +make_file "$nsin" + +# First test: +# No PMTU discovery, nsr1 is expected to fragment packets from ns1 to ns2 as needed. +# Due to MTU mismatch in both directions, all packets (except small packets like pure +# acks) have to be handled by normal forwarding path. Therefore, packet counters +# are not checked. +if test_tcp_forwarding $ns1 $ns2; then + echo "PASS: flow offloaded for ns1/ns2" +else + echo "FAIL: flow offload for ns1/ns2:" 1>&2 + ip netns exec $nsr1 nft list ruleset + ret=1 +fi + +# delete default route, i.e. ns2 won't be able to reach ns1 and +# will depend on ns1 being masqueraded in nsr1. +# expect ns1 has nsr1 address. +ip -net $ns2 route del default via 10.0.2.1 +ip -net $ns2 route del default via dead:2::1 +ip -net $ns2 route add 192.168.10.1 via 10.0.2.1 + +# Second test: +# Same, but with NAT enabled. Same as in first test: we expect normal forward path +# to handle most packets. +ip netns exec $nsr1 nft -f - <<EOF +table ip nat { + chain prerouting { + type nat hook prerouting priority 0; policy accept; + meta iif "veth0" ip daddr 10.6.6.6 tcp dport 1666 counter dnat ip to 10.0.2.99:12345 + } + + chain postrouting { + type nat hook postrouting priority 0; policy accept; + meta oifname "veth1" counter masquerade + } +} +EOF + +if ! test_tcp_forwarding_nat $ns1 $ns2 0 ""; then + echo "FAIL: flow offload for ns1/ns2 with NAT" 1>&2 + ip netns exec $nsr1 nft list ruleset + ret=1 +fi + +# Third test: +# Same as second test, but with PMTU discovery enabled. This +# means that we expect the fastpath to handle packets as soon +# as the endpoints adjust the packet size. +ip netns exec $ns1 sysctl net.ipv4.ip_no_pmtu_disc=0 > /dev/null +ip netns exec $ns2 sysctl net.ipv4.ip_no_pmtu_disc=0 > /dev/null + +# reset counters. +# With pmtu in-place we'll also check that nft counters +# are lower than file size and packets were forwarded via flowtable layer. +# For earlier tests (large mtus), packets cannot be handled via flowtable +# (except pure acks and other small packets). +ip netns exec $nsr1 nft reset counters table inet filter >/dev/null + +if ! test_tcp_forwarding_nat $ns1 $ns2 1 ""; then + echo "FAIL: flow offload for ns1/ns2 with NAT and pmtu discovery" 1>&2 + ip netns exec $nsr1 nft list ruleset +fi + +# Another test: +# Add bridge interface br0 to Router1, with NAT enabled. +ip -net $nsr1 link add name br0 type bridge +ip -net $nsr1 addr flush dev veth0 +ip -net $nsr1 link set up dev veth0 +ip -net $nsr1 link set veth0 master br0 +ip -net $nsr1 addr add 10.0.1.1/24 dev br0 +ip -net $nsr1 addr add dead:1::1/64 dev br0 +ip -net $nsr1 link set up dev br0 + +ip netns exec $nsr1 sysctl net.ipv4.conf.br0.forwarding=1 > /dev/null + +# br0 with NAT enabled. +ip netns exec $nsr1 nft -f - <<EOF +flush table ip nat +table ip nat { + chain prerouting { + type nat hook prerouting priority 0; policy accept; + meta iif "br0" ip daddr 10.6.6.6 tcp dport 1666 counter dnat ip to 10.0.2.99:12345 + } + + chain postrouting { + type nat hook postrouting priority 0; policy accept; + meta oifname "veth1" counter masquerade + } +} +EOF + +if ! test_tcp_forwarding_nat $ns1 $ns2 1 "on bridge"; then + echo "FAIL: flow offload for ns1/ns2 with bridge NAT" 1>&2 + ip netns exec $nsr1 nft list ruleset + ret=1 +fi + + +# Another test: +# Add bridge interface br0 to Router1, with NAT and VLAN. +ip -net $nsr1 link set veth0 nomaster +ip -net $nsr1 link set down dev veth0 +ip -net $nsr1 link add link veth0 name veth0.10 type vlan id 10 +ip -net $nsr1 link set up dev veth0 +ip -net $nsr1 link set up dev veth0.10 +ip -net $nsr1 link set veth0.10 master br0 + +ip -net $ns1 addr flush dev eth0 +ip -net $ns1 link add link eth0 name eth0.10 type vlan id 10 +ip -net $ns1 link set eth0 up +ip -net $ns1 link set eth0.10 up +ip -net $ns1 addr add 10.0.1.99/24 dev eth0.10 +ip -net $ns1 route add default via 10.0.1.1 +ip -net $ns1 addr add dead:1::99/64 dev eth0.10 + +if ! test_tcp_forwarding_nat $ns1 $ns2 1 "bridge and VLAN"; then + echo "FAIL: flow offload for ns1/ns2 with bridge NAT and VLAN" 1>&2 + ip netns exec $nsr1 nft list ruleset + ret=1 +fi + +# restore test topology (remove bridge and VLAN) +ip -net $nsr1 link set veth0 nomaster +ip -net $nsr1 link set veth0 down +ip -net $nsr1 link set veth0.10 down +ip -net $nsr1 link delete veth0.10 type vlan +ip -net $nsr1 link delete br0 type bridge +ip -net $ns1 addr flush dev eth0.10 +ip -net $ns1 link set eth0.10 down +ip -net $ns1 link set eth0 down +ip -net $ns1 link delete eth0.10 type vlan + +# restore address in ns1 and nsr1 +ip -net $ns1 link set eth0 up +ip -net $ns1 addr add 10.0.1.99/24 dev eth0 +ip -net $ns1 route add default via 10.0.1.1 +ip -net $ns1 addr add dead:1::99/64 dev eth0 +ip -net $ns1 route add default via dead:1::1 +ip -net $nsr1 addr add 10.0.1.1/24 dev veth0 +ip -net $nsr1 addr add dead:1::1/64 dev veth0 +ip -net $nsr1 link set up dev veth0 + +KEY_SHA="0x"$(ps -xaf | sha1sum | cut -d " " -f 1) +KEY_AES="0x"$(ps -xaf | md5sum | cut -d " " -f 1) +SPI1=$RANDOM +SPI2=$RANDOM + +if [ $SPI1 -eq $SPI2 ]; then + SPI2=$((SPI2+1)) +fi + +do_esp() { + local ns=$1 + local me=$2 + local remote=$3 + local lnet=$4 + local rnet=$5 + local spi_out=$6 + local spi_in=$7 + + ip -net $ns xfrm state add src $remote dst $me proto esp spi $spi_in enc aes $KEY_AES auth sha1 $KEY_SHA mode tunnel sel src $rnet dst $lnet + ip -net $ns xfrm state add src $me dst $remote proto esp spi $spi_out enc aes $KEY_AES auth sha1 $KEY_SHA mode tunnel sel src $lnet dst $rnet + + # to encrypt packets as they go out (includes forwarded packets that need encapsulation) + ip -net $ns xfrm policy add src $lnet dst $rnet dir out tmpl src $me dst $remote proto esp mode tunnel priority 1 action allow + # to fwd decrypted packets after esp processing: + ip -net $ns xfrm policy add src $rnet dst $lnet dir fwd tmpl src $remote dst $me proto esp mode tunnel priority 1 action allow + +} + +do_esp $nsr1 192.168.10.1 192.168.10.2 10.0.1.0/24 10.0.2.0/24 $SPI1 $SPI2 + +do_esp $nsr2 192.168.10.2 192.168.10.1 10.0.2.0/24 10.0.1.0/24 $SPI2 $SPI1 + +ip netns exec $nsr1 nft delete table ip nat + +# restore default routes +ip -net $ns2 route del 192.168.10.1 via 10.0.2.1 +ip -net $ns2 route add default via 10.0.2.1 +ip -net $ns2 route add default via dead:2::1 + +if test_tcp_forwarding $ns1 $ns2; then + check_counters "ipsec tunnel mode for ns1/ns2" +else + echo "FAIL: ipsec tunnel mode for ns1/ns2" + ip netns exec $nsr1 nft list ruleset 1>&2 + ip netns exec $nsr1 cat /proc/net/xfrm_stat 1>&2 +fi + +exit $ret |