#!/bin/bash
#
# This tests nf_queue:
# 1. can process packets from all hooks
# 2. support running nfqueue from more than one base chain
#
# shellcheck disable=SC2162,SC2317
source lib.sh
ret=0
timeout=2
cleanup()
{
ip netns pids "$ns1" | xargs kill 2>/dev/null
ip netns pids "$ns2" | xargs kill 2>/dev/null
ip netns pids "$nsrouter" | xargs kill 2>/dev/null
cleanup_all_ns
rm -f "$TMPINPUT"
rm -f "$TMPFILE0"
rm -f "$TMPFILE1"
rm -f "$TMPFILE2" "$TMPFILE3"
}
checktool "nft --version" "test without nft tool"
trap cleanup EXIT
setup_ns ns1 ns2 nsrouter
TMPFILE0=$(mktemp)
TMPFILE1=$(mktemp)
TMPFILE2=$(mktemp)
TMPFILE3=$(mktemp)
TMPINPUT=$(mktemp)
dd conv=sparse status=none if=/dev/zero bs=1M count=200 of="$TMPINPUT"
if ! ip link add veth0 netns "$nsrouter" type veth peer name eth0 netns "$ns1" > /dev/null 2>&1; then
echo "SKIP: No virtual ethernet pair device support in kernel"
exit $ksft_skip
fi
ip link add veth1 netns "$nsrouter" type veth peer name eth0 netns "$ns2"
ip -net "$nsrouter" link set veth0 up
ip -net "$nsrouter" addr add 10.0.1.1/24 dev veth0
ip -net "$nsrouter" addr add dead:1::1/64 dev veth0 nodad
ip -net "$nsrouter" link set veth1 up
ip -net "$nsrouter" addr add 10.0.2.1/24 dev veth1
ip -net "$nsrouter" addr add dead:2::1/64 dev veth1 nodad
ip -net "$ns1" link set eth0 up
ip -net "$ns2" link set eth0 up
ip -net "$ns1" addr add 10.0.1.99/24 dev eth0
ip -net "$ns1" addr add dead:1::99/64 dev eth0 nodad
ip -net "$ns1" route add default via 10.0.1.1
ip -net "$ns1" route add default via dead:1::1
ip -net "$ns2" addr add 10.0.2.99/24 dev eth0
ip -net "$ns2" addr add dead:2::99/64 dev eth0 nodad
ip -net "$ns2" route add default via 10.0.2.1
ip -net "$ns2" route add default via dead:2::1
load_ruleset() {
local name=$1
local prio=$2
ip netns exec "$nsrouter" nft -f /dev/stdin <<EOF
table inet $name {
chain nfq {
ip protocol icmp queue bypass
icmpv6 type { "echo-request", "echo-reply" } queue num 1 bypass
}
chain pre {
type filter hook prerouting priority $prio; policy accept;
jump nfq
}
chain input {
type filter hook input priority $prio; policy accept;
jump nfq
}
chain forward {
type filter hook forward priority $prio; policy accept;
tcp dport 12345 queue num 2
jump nfq
}
chain output {
type filter hook output priority $prio; policy accept;
tcp dport 12345 queue num 3
tcp sport 23456 queue num 3
jump nfq
}
chain post {
type filter hook postrouting priority $prio; policy accept;
jump nfq
}
}
EOF
}
load_counter_ruleset() {
local prio=$1
ip netns exec "$nsrouter" nft -f /dev/stdin <<EOF
table inet countrules {
chain pre {
type filter hook prerouting priority $prio; policy accept;
counter
}
chain input {
type filter hook input priority $prio; policy accept;
counter
}
chain forward {
type filter hook forward priority $prio; policy accept;
counter
}
chain output {
type filter hook output priority $prio; policy accept;
counter
}
chain post {
type filter hook postrouting priority $prio; policy accept;
counter
}
}
EOF
}
test_ping() {
if ! ip netns exec "$ns1" ping -c 1 -q 10.0.2.99 > /dev/null; then
return 1
fi
if ! ip netns exec "$ns1" ping -c 1 -q dead:2::99 > /dev/null; then
return 2
fi
return 0
}
test_ping_router() {
if ! ip netns exec "$ns1" ping -c 1 -q 10.0.2.1 > /dev/null; then
return 3
fi
if ! ip netns exec "$ns1" ping -c 1 -q dead:2::1 > /dev/null; then
return 4
fi
return 0
}
test_queue_blackhole() {
local proto=$1
ip netns exec "$nsrouter" nft -f /dev/stdin <<EOF
table $proto blackh {
chain forward {
type filter hook forward priority 0; policy accept;
queue num 600
}
}
EOF
if [ "$proto" = "ip" ] ;then
ip netns exec "$ns1" ping -W 2 -c 1 -q 10.0.2.99 > /dev/null
lret=$?
elif [ "$proto" = "ip6" ]; then
ip netns exec "$ns1" ping -W 2 -c 1 -q dead:2::99 > /dev/null
lret=$?
else
lret=111
fi
# queue without bypass keyword should drop traffic if no listener exists.
if [ "$lret" -eq 0 ];then
echo "FAIL: $proto expected failure, got $lret" 1>&2
exit 1
fi
if ! ip netns exec "$nsrouter" nft delete table "$proto" blackh; then
echo "FAIL: $proto: Could not delete blackh table"
exit 1
fi
echo "PASS: $proto: statement with no listener results in packet drop"
}
nf_queue_wait()
{
local procfile="/proc/self/net/netfilter/nfnetlink_queue"
local netns id
netns="$1"
id="$2"
# if this file doesn't exist, nfnetlink_module isn't loaded.
# rather than loading it ourselves, wait for kernel module autoload
# completion, nfnetlink should do so automatically because nf_queue
# helper program, spawned in the background, asked for this functionality.
test -f "$procfile" &&
ip netns exec "$netns" cat "$procfile" | grep -q "^ *$id "
}
test_queue()
{
local expected="$1"
local last=""
# spawn nf_queue listeners
ip netns exec "$nsrouter" ./nf_queue -c -q 0 -t $timeout > "$TMPFILE0" &
ip netns exec "$nsrouter" ./nf_queue -c -q 1 -t $timeout > "$TMPFILE1" &
busywait "$BUSYWAIT_TIMEOUT" nf_queue_wait "$nsrouter" 0
busywait "$BUSYWAIT_TIMEOUT" nf_queue_wait "$nsrouter" 1
if ! test_ping;then
echo "FAIL: netns routing/connectivity with active listener on queues 0 and 1: $ret" 1>&2
exit $ret
fi
if ! test_ping_router;then
echo "FAIL: netns router unreachable listener on queue 0 and 1: $ret" 1>&2
exit $ret
fi
wait
ret=$?
for file in $TMPFILE0 $TMPFILE1; do
last=$(tail -n1 "$file")
if [ x"$last" != x"$expected packets total" ]; then
echo "FAIL: Expected $expected packets total, but got $last" 1>&2
ip netns exec "$nsrouter" nft list ruleset
exit 1
fi
done
echo "PASS: Expected and received $last"
}
listener_ready()
{
ss -N "$1" -lnt -o "sport = :12345" | grep -q 12345
}
test_tcp_forward()
{
ip netns exec "$nsrouter" ./nf_queue -q 2 -t "$timeout" &
local nfqpid=$!
timeout 5 ip netns exec "$ns2" socat -u TCP-LISTEN:12345 STDOUT >/dev/null &
local rpid=$!
busywait "$BUSYWAIT_TIMEOUT" listener_ready "$ns2"
ip netns exec "$ns1" socat -u STDIN TCP:10.0.2.99:12345 <"$TMPINPUT" >/dev/null
wait "$rpid" && echo "PASS: tcp and nfqueue in forward chain"
}
test_tcp_localhost()
{
dd conv=sparse status=none if=/dev/zero bs=1M count=200 of="$TMPINPUT"
timeout 5 ip netns exec "$nsrouter" socat -u TCP-LISTEN:12345 STDOUT >/dev/null &
local rpid=$!
ip netns exec "$nsrouter" ./nf_queue -q 3 -t "$timeout" &
local nfqpid=$!
busywait "$BUSYWAIT_TIMEOUT" listener_ready "$nsrouter"
ip netns exec "$nsrouter" socat -u STDIN TCP:127.0.0.1:12345 <"$TMPINPUT" >/dev/null
wait "$rpid" && echo "PASS: tcp via loopback"
wait 2>/dev/null
}
test_tcp_localhost_connectclose()
{
ip netns exec "$nsrouter" ./connect_close -p 23456 -t "$timeout" &
ip netns exec "$nsrouter" ./nf_queue -q 3 -t "$timeout" &
busywait "$BUSYWAIT_TIMEOUT" nf_queue_wait "$nsrouter" 3
wait && echo "PASS: tcp via loopback with connect/close"
wait 2>/dev/null
}
test_tcp_localhost_requeue()
{
ip netns exec "$nsrouter" nft -f /dev/stdin <<EOF
flush ruleset
table inet filter {
chain output {
type filter hook output priority 0; policy accept;
tcp dport 12345 limit rate 1/second burst 1 packets counter queue num 0
}
chain post {
type filter hook postrouting priority 0; policy accept;
tcp dport 12345 limit rate 1/second burst 1 packets counter queue num 0
}
}
EOF
timeout 5 ip netns exec "$nsrouter" socat -u TCP-LISTEN:12345 STDOUT >/dev/null &
local rpid=$!
ip netns exec "$nsrouter" ./nf_queue -c -q 1 -t "$timeout" > "$TMPFILE2" &
# nfqueue 1 will be called via output hook. But this time,
# re-queue the packet to nfqueue program on queue 2.
ip netns exec "$nsrouter" ./nf_queue -G -d 150 -c -q 0 -Q 1 -t "$timeout" > "$TMPFILE3" &
busywait "$BUSYWAIT_TIMEOUT" listener_ready "$nsrouter"
ip netns exec "$nsrouter" socat -u STDIN TCP:127.0.0.1:12345 <"$TMPINPUT" > /dev/null
wait
if ! diff -u "$TMPFILE2" "$TMPFILE3" ; then
echo "FAIL: lost packets during requeue?!" 1>&2
return
fi
echo "PASS: tcp via loopback and re-queueing"
}
test_icmp_vrf() {
if ! ip -net "$ns1" link add tvrf type vrf table 9876;then
echo "SKIP: Could not add vrf device"
return
fi
ip -net "$ns1" li set eth0 master tvrf
ip -net "$ns1" li set tvrf up
ip -net "$ns1" route add 10.0.2.0/24 via 10.0.1.1 dev eth0 table 9876
ip netns exec "$ns1" nft -f /dev/stdin <<EOF
flush ruleset
table inet filter {
chain output {
type filter hook output priority 0; policy accept;
meta oifname "tvrf" icmp type echo-request counter queue num 1
meta oifname "eth0" icmp type echo-request counter queue num 1
}
chain post {
type filter hook postrouting priority 0; policy accept;
meta oifname "tvrf" icmp type echo-request counter queue num 1
meta oifname "eth0" icmp type echo-request counter queue num 1
}
}
EOF
ip netns exec "$ns1" ./nf_queue -q 1 -t "$timeout" &
local nfqpid=$!
busywait "$BUSYWAIT_TIMEOUT" nf_queue_wait "$ns1" 1
ip netns exec "$ns1" ip vrf exec tvrf ping -c 1 10.0.2.99 > /dev/null
for n in output post; do
for d in tvrf eth0; do
if ! ip netns exec "$ns1" nft list chain inet filter "$n" | grep -q "oifname \"$d\" icmp type echo-request counter packets 1"; then
echo "FAIL: chain $n: icmp packet counter mismatch for device $d" 1>&2
ip netns exec "$ns1" nft list ruleset
ret=1
return
fi
done
done
wait "$nfqpid" && echo "PASS: icmp+nfqueue via vrf"
wait 2>/dev/null
}
test_queue_removal()
{
read tainted_then < /proc/sys/kernel/tainted
ip netns exec "$ns1" nft -f - <<EOF
flush ruleset
table ip filter {
chain output {
type filter hook output priority 0; policy accept;
ip protocol icmp queue num 0
}
}
EOF
ip netns exec "$ns1" ./nf_queue -q 0 -d 30000 -t "$timeout" &
local nfqpid=$!
busywait "$BUSYWAIT_TIMEOUT" nf_queue_wait "$ns1" 0
ip netns exec "$ns1" ping -w 2 -f -c 10 127.0.0.1 -q >/dev/null
kill $nfqpid
ip netns exec "$ns1" nft flush ruleset
if [ "$tainted_then" -ne 0 ];then
return
fi
read tainted_now < /proc/sys/kernel/tainted
if [ "$tainted_now" -eq 0 ];then
echo "PASS: queue program exiting while packets queued"
else
echo "TAINT: queue program exiting while packets queued"
ret=1
fi
}
ip netns exec "$nsrouter" sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
ip netns exec "$nsrouter" sysctl net.ipv4.conf.veth0.forwarding=1 > /dev/null
ip netns exec "$nsrouter" sysctl net.ipv4.conf.veth1.forwarding=1 > /dev/null
load_ruleset "filter" 0
if test_ping; then
# queue bypass works (rules were skipped, no listener)
echo "PASS: ${ns1} can reach ${ns2}"
else
echo "FAIL: ${ns1} cannot reach ${ns2}: $ret" 1>&2
exit $ret
fi
test_queue_blackhole ip
test_queue_blackhole ip6
# dummy ruleset to add base chains between the
# queueing rules. We don't want the second reinject
# to re-execute the old hooks.
load_counter_ruleset 10
# we are hooking all: prerouting/input/forward/output/postrouting.
# we ping ${ns2} from ${ns1} via ${nsrouter} using ipv4 and ipv6, so:
# 1x icmp prerouting,forward,postrouting -> 3 queue events (6 incl. reply).
# 1x icmp prerouting,input,output postrouting -> 4 queue events incl. reply.
# so we expect that userspace program receives 10 packets.
test_queue 10
# same. We queue to a second program as well.
load_ruleset "filter2" 20
test_queue 20
test_tcp_forward
test_tcp_localhost
test_tcp_localhost_connectclose
test_tcp_localhost_requeue
test_icmp_vrf
test_queue_removal
exit $ret
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