diff options
| -rw-r--r-- | tools/testing/selftests/netfilter/Makefile | 2 | ||||
| -rwxr-xr-x | tools/testing/selftests/netfilter/nft_flowtable.sh | 324 |
2 files changed, 325 insertions, 1 deletions
diff --git a/tools/testing/selftests/netfilter/Makefile b/tools/testing/selftests/netfilter/Makefile index 3e6d1bcc2894..4144984ebee5 100644 --- a/tools/testing/selftests/netfilter/Makefile +++ b/tools/testing/selftests/netfilter/Makefile @@ -2,6 +2,6 @@ # Makefile for netfilter selftests TEST_PROGS := nft_trans_stress.sh nft_nat.sh bridge_brouter.sh \ - conntrack_icmp_related.sh + conntrack_icmp_related.sh nft_flowtable.sh include ../lib.mk diff --git a/tools/testing/selftests/netfilter/nft_flowtable.sh b/tools/testing/selftests/netfilter/nft_flowtable.sh new file mode 100755 index 000000000000..fe52488a6f72 --- /dev/null +++ b/tools/testing/selftests/netfilter/nft_flowtable.sh @@ -0,0 +1,324 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# This tests basic flowtable functionality. +# Creates following 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. + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 +ret=0 + +ns1in="" +ns2in="" +ns1out="" +ns2out="" + +log_netns=$(sysctl -n net.netfilter.nf_log_all_netns) + +nft --version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without nft tool" + exit $ksft_skip +fi + +ip -Version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without ip tool" + exit $ksft_skip +fi + +which nc > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without nc (netcat)" + exit $ksft_skip +fi + +ip netns add nsr1 +if [ $? -ne 0 ];then + echo "SKIP: Could not create net namespace" + exit $ksft_skip +fi + +ip netns add ns1 +ip netns add ns2 + +ip netns add nsr2 + +cleanup() { + for i in 1 2; do + ip netns del ns$i + ip netns del nsr$i + done + + rm -f "$ns1in" "$ns1out" + rm -f "$ns2in" "$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 + for i in 1 2; do + ip -net nsr$i link set $dev up + done +done + +ip -net nsr1 addr add 10.0.1.1/24 dev veth0 +ip -net nsr1 addr add dead:1::1/64 dev veth0 + +ip -net nsr2 addr add 10.0.2.1/24 dev veth1 +ip -net nsr2 addr add dead:2::1/64 dev veth1 + +# set different MTUs so we need to push packets coming from ns1 (large MTU) +# to ns2 (smaller MTU) to stack either to perform fragmentation (ip_no_pmtu_disc=1), +# or to do PTMU discovery (send ICMP error back to originator). +# ns2 is going via nsr2 with a smaller mtu, so that TCPMSS announced by both peers +# is NOT the lowest link mtu. + +ip -net nsr1 link set veth0 mtu 9000 +ip -net ns1 link set eth0 mtu 9000 + +ip -net nsr2 link set veth1 mtu 2000 +ip -net ns2 link set eth0 mtu 2000 + +# transfer-net between nsr1 and nsr2. +# these addresses are not used for connections. +ip -net nsr1 addr add 192.168.10.1/24 dev veth1 +ip -net nsr1 addr add fee1:2::1/64 dev veth1 + +ip -net nsr2 addr add 192.168.10.2/24 dev veth0 +ip -net nsr2 addr add fee1:2::2/64 dev veth0 + +for i in 1 2; do + ip netns exec nsr$i sysctl net.ipv4.conf.veth0.forwarding=1 > /dev/null + ip netns exec nsr$i sysctl net.ipv4.conf.veth1.forwarding=1 > /dev/null + + ip -net ns$i link set lo up + ip -net ns$i link set eth0 up + ip -net ns$i addr add 10.0.$i.99/24 dev eth0 + ip -net ns$i route add default via 10.0.$i.1 + ip -net ns$i addr add dead:$i::99/64 dev eth0 + ip -net ns$i route add default via dead:$i::1 + ip netns exec ns$i sysctl net.ipv4.tcp_no_metrics_save=1 > /dev/null + + # don't set ip DF bit for first two tests + ip netns exec ns$i sysctl net.ipv4.ip_no_pmtu_disc=1 > /dev/null +done + +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 } + } + + 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 flow offload @f1 counter + + # use packet size to trigger 'should be offloaded by now'. + # otherwise, if 'flow offload' expression never offloads, the + # test will pass. + tcp dport 12345 meta length gt 200 ct mark set 1 counter + + # this turns off flow offloading internally, so expect packets again + tcp flags fin,rst ct mark set 0 accept + + # this allows large packets from responder, we need this as long + # as PMTUd is off. + # This rule is deleted for the last test, when we expect PMTUd + # to kick in and ensure all packets meet mtu requirements. + meta length gt 1500 accept comment something-to-grep-for + + # next line blocks connection w.o. working offload. + # we only do this for reverse dir, because we expect packets to + # enter slow path due to MTU mismatch of veth0 and veth1. + tcp sport 12345 ct mark 1 counter log prefix "mark failure " drop + + ct state established,related accept + + # for packets that we can't offload yet, i.e. SYN (any ct that is not confirmed) + meta length lt 200 oif "veth1" tcp dport 12345 counter 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 +ip netns exec ns1 ping -c 1 -q 10.0.2.99 > /dev/null +if [ $? -ne 0 ];then + echo "ERROR: ns1 cannot reach ns2" 1>&2 + bash + exit 1 +fi + +ip netns exec ns2 ping -c 1 -q 10.0.1.99 > /dev/null +if [ $? -ne 0 ];then + echo "ERROR: ns2 cannot reach ns1" 1>&2 + exit 1 +fi + +if [ $ret -eq 0 ];then + echo "PASS: netns routing/connectivity: ns1 can reach ns2" +fi + +ns1in=$(mktemp) +ns1out=$(mktemp) +ns2in=$(mktemp) +ns2out=$(mktemp) + +make_file() +{ + name=$1 + who=$2 + + SIZE=$((RANDOM % (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_transfer() +{ + in=$1 + out=$2 + what=$3 + + cmp "$in" "$out" > /dev/null 2>&1 + if [ $? -ne 0 ] ;then + echo "FAIL: file mismatch for $what" 1>&2 + ls -l "$in" + ls -l "$out" + return 1 + fi + + return 0 +} + +test_tcp_forwarding() +{ + local nsa=$1 + local nsb=$2 + local lret=0 + + ip netns exec $nsb nc -w 5 -l -p 12345 < "$ns2in" > "$ns2out" & + lpid=$! + + sleep 1 + ip netns exec $nsa nc -w 4 10.0.2.99 12345 < "$ns1in" > "$ns1out" & + cpid=$! + + sleep 3 + + kill $lpid + kill $cpid + wait + + check_transfer "$ns1in" "$ns2out" "ns1 -> ns2" + if [ $? -ne 0 ];then + lret=1 + fi + + check_transfer "$ns2in" "$ns1out" "ns1 <- ns2" + if [ $? -ne 0 ];then + lret=1 + fi + + return $lret +} + +make_file "$ns1in" "ns1" +make_file "$ns2in" "ns2" + +# First test: +# No PMTU discovery, nsr1 is expected to fragment packets from ns1 to ns2 as needed. +test_tcp_forwarding ns1 ns2 +if [ $? -eq 0 ] ;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. +ip netns exec nsr1 nft -f - <<EOF +table ip nat { + chain postrouting { + type nat hook postrouting priority 0; policy accept; + meta oifname "veth1" masquerade + } +} +EOF + +test_tcp_forwarding ns1 ns2 + +if [ $? -eq 0 ] ;then + echo "PASS: flow offloaded for ns1/ns2 with NAT" +else + echo "FAIL: flow offload for ns1/ns2 with NAT" 1>&2 + ip netns exec nsr1 nft list ruleset + ret=1 +fi + +# Third test: +# Same as second test, but with PMTU discovery enabled. +handle=$(ip netns exec nsr1 nft -a list table inet filter | grep something-to-grep-for | cut -d \# -f 2) + +ip netns exec nsr1 nft delete rule inet filter forward $handle +if [ $? -ne 0 ] ;then + echo "FAIL: Could not delete large-packet accept rule" + exit 1 +fi + +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 + +test_tcp_forwarding ns1 ns2 +if [ $? -eq 0 ] ;then + echo "PASS: flow offloaded for ns1/ns2 with NAT and pmtu discovery" +else + echo "FAIL: flow offload for ns1/ns2 with NAT and pmtu discovery" 1>&2 + ip netns exec nsr1 nft list ruleset +fi + +exit $ret |