--- /dev/null
+#!/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
projects / users / jedix / linux-maple.git / commitdiff