diff options
Diffstat (limited to 'tools/testing/selftests/net/netfilter/nft_nat_zones.sh')
-rwxr-xr-x | tools/testing/selftests/net/netfilter/nft_nat_zones.sh | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/netfilter/nft_nat_zones.sh b/tools/testing/selftests/net/netfilter/nft_nat_zones.sh new file mode 100755 index 000000000000..3b81d88bdde3 --- /dev/null +++ b/tools/testing/selftests/net/netfilter/nft_nat_zones.sh @@ -0,0 +1,267 @@ +#!/bin/bash +# +# Test connection tracking zone and NAT source port reallocation support. +# + +source lib.sh + +# Don't increase too much, 2000 clients should work +# just fine but script can then take several minutes with +# KASAN/debug builds. +maxclients=100 + +have_socat=0 +ret=0 + +[ "$KSFT_MACHINE_SLOW" = yes ] && maxclients=40 +# client1---. +# veth1-. +# | +# NAT Gateway --veth0--> Server +# | | +# veth2-' | +# client2---' | +# .... | +# clientX----vethX---' + +# All clients share identical IP address. +# NAT Gateway uses policy routing and conntrack zones to isolate client +# namespaces. Each client connects to Server, each with colliding tuples: +# clientsaddr:10000 -> serveraddr:dport +# NAT Gateway is supposed to do port reallocation for each of the +# connections. + +v4gc1=$(sysctl -n net.ipv4.neigh.default.gc_thresh1 2>/dev/null) +v4gc2=$(sysctl -n net.ipv4.neigh.default.gc_thresh2 2>/dev/null) +v4gc3=$(sysctl -n net.ipv4.neigh.default.gc_thresh3 2>/dev/null) +v6gc1=$(sysctl -n net.ipv6.neigh.default.gc_thresh1 2>/dev/null) +v6gc2=$(sysctl -n net.ipv6.neigh.default.gc_thresh2 2>/dev/null) +v6gc3=$(sysctl -n net.ipv6.neigh.default.gc_thresh3 2>/dev/null) + +cleanup() +{ + cleanup_all_ns + + sysctl -q net.ipv4.neigh.default.gc_thresh1="$v4gc1" 2>/dev/null + sysctl -q net.ipv4.neigh.default.gc_thresh2="$v4gc2" 2>/dev/null + sysctl -q net.ipv4.neigh.default.gc_thresh3="$v4gc3" 2>/dev/null + sysctl -q net.ipv6.neigh.default.gc_thresh1="$v6gc1" 2>/dev/null + sysctl -q net.ipv6.neigh.default.gc_thresh2="$v6gc2" 2>/dev/null + sysctl -q net.ipv6.neigh.default.gc_thresh3="$v6gc3" 2>/dev/null +} + +checktool "nft --version" echo "run test without nft tool" +checktool "conntrack -V" "run test without conntrack tool" + +if socat -h >/dev/null 2>&1; then + have_socat=1 +fi + +setup_ns gw srv + +trap cleanup EXIT + +ip link add veth0 netns "$gw" type veth peer name eth0 netns "$srv" +ip -net "$gw" link set veth0 up +ip -net "$srv" link set eth0 up + +sysctl -q net.ipv6.neigh.default.gc_thresh1=512 2>/dev/null +sysctl -q net.ipv6.neigh.default.gc_thresh2=1024 2>/dev/null +sysctl -q net.ipv6.neigh.default.gc_thresh3=4096 2>/dev/null +sysctl -q net.ipv4.neigh.default.gc_thresh1=512 2>/dev/null +sysctl -q net.ipv4.neigh.default.gc_thresh2=1024 2>/dev/null +sysctl -q net.ipv4.neigh.default.gc_thresh3=4096 2>/dev/null + +for i in $(seq 1 "$maxclients");do + setup_ns "cl$i" + + cl=$(eval echo \$cl"$i") + if ! ip link add veth"$i" netns "$gw" type veth peer name eth0 netns "$cl" > /dev/null 2>&1;then + echo "SKIP: No virtual ethernet pair device support in kernel" + exit $ksft_skip + fi +done + +for i in $(seq 1 "$maxclients");do + cl=$(eval echo \$cl"$i") + echo netns exec "$cl" ip link set eth0 up + echo netns exec "$cl" sysctl -q net.ipv4.tcp_syn_retries=2 + echo netns exec "$gw" ip link set "veth$i" up + echo netns exec "$gw" sysctl -q net.ipv4.conf.veth"$i".arp_ignore=2 + echo netns exec "$gw" sysctl -q net.ipv4.conf.veth"$i".rp_filter=0 + + # clients have same IP addresses. + echo netns exec "$cl" ip addr add 10.1.0.3/24 dev eth0 + echo netns exec "$cl" ip addr add dead:1::3/64 dev eth0 nodad + echo netns exec "$cl" ip route add default via 10.1.0.2 dev eth0 + echo netns exec "$cl" ip route add default via dead:1::2 dev eth0 + + # NB: same addresses on client-facing interfaces. + echo netns exec "$gw" ip addr add 10.1.0.2/24 dev "veth$i" + echo netns exec "$gw" ip addr add dead:1::2/64 dev "veth$i" nodad + + # gw: policy routing + echo netns exec "$gw" ip route add 10.1.0.0/24 dev "veth$i" table $((1000+i)) + echo netns exec "$gw" ip route add dead:1::0/64 dev "veth$i" table $((1000+i)) + echo netns exec "$gw" ip route add 10.3.0.0/24 dev veth0 table $((1000+i)) + echo netns exec "$gw" ip route add dead:3::0/64 dev veth0 table $((1000+i)) + echo netns exec "$gw" ip rule add fwmark "$i" lookup $((1000+i)) +done | ip -batch /dev/stdin + +ip -net "$gw" addr add 10.3.0.1/24 dev veth0 +ip -net "$gw" addr add dead:3::1/64 dev veth0 nodad + +ip -net "$srv" addr add 10.3.0.99/24 dev eth0 +ip -net "$srv" addr add dead:3::99/64 dev eth0 nodad + +ip netns exec "$gw" nft -f /dev/stdin<<EOF +table inet raw { + map iiftomark { + type ifname : mark + } + + map iiftozone { + typeof iifname : ct zone + } + + set inicmp { + flags dynamic + type ipv4_addr . ifname . ipv4_addr + } + set inflows { + flags dynamic + type ipv4_addr . inet_service . ifname . ipv4_addr . inet_service + } + + set inflows6 { + flags dynamic + type ipv6_addr . inet_service . ifname . ipv6_addr . inet_service + } + + chain prerouting { + type filter hook prerouting priority -64000; policy accept; + ct original zone set meta iifname map @iiftozone + meta mark set meta iifname map @iiftomark + + tcp flags & (syn|ack) == ack add @inflows { ip saddr . tcp sport . meta iifname . ip daddr . tcp dport counter } + add @inflows6 { ip6 saddr . tcp sport . meta iifname . ip6 daddr . tcp dport counter } + ip protocol icmp add @inicmp { ip saddr . meta iifname . ip daddr counter } + } + + chain nat_postrouting { + type nat hook postrouting priority 0; policy accept; + ct mark set meta mark meta oifname veth0 masquerade + } + + chain mangle_prerouting { + type filter hook prerouting priority -100; policy accept; + ct direction reply meta mark set ct mark + } +} +EOF +if [ "$?" -ne 0 ];then + echo "SKIP: Could not add nftables rules" + exit $ksft_skip +fi + +( echo add element inet raw iiftomark \{ + for i in $(seq 1 $((maxclients-1))); do + echo \"veth"$i"\" : "$i", + done + echo \"veth"$maxclients"\" : "$maxclients" \} + echo add element inet raw iiftozone \{ + for i in $(seq 1 $((maxclients-1))); do + echo \"veth"$i"\" : "$i", + done + echo \"veth$maxclients\" : $maxclients \} +) | ip netns exec "$gw" nft -f /dev/stdin + +ip netns exec "$gw" sysctl -q net.ipv4.conf.all.forwarding=1 > /dev/null +ip netns exec "$gw" sysctl -q net.ipv6.conf.all.forwarding=1 > /dev/null +ip netns exec "$gw" sysctl -q net.ipv4.conf.all.rp_filter=0 >/dev/null + +# useful for debugging: allows to use 'ping' from clients to gateway. +ip netns exec "$gw" sysctl -q net.ipv4.fwmark_reflect=1 > /dev/null +ip netns exec "$gw" sysctl -q net.ipv6.fwmark_reflect=1 > /dev/null + +for i in $(seq 1 "$maxclients"); do + cl=$(eval echo \$cl"$i") + ip netns exec "$cl" ping -i 0.5 -q -c 3 10.3.0.99 > /dev/null 2>&1 & +done + +wait || ret=1 + +[ "$ret" -ne 0 ] && "FAIL: Ping failure from $cl" 1>&2 + +for i in $(seq 1 "$maxclients"); do + if ! ip netns exec "$gw" nft get element inet raw inicmp "{ 10.1.0.3 . \"veth$i\" . 10.3.0.99 }" | grep -q "{ 10.1.0.3 . \"veth$i\" . 10.3.0.99 counter packets 3 bytes 252 }"; then + ret=1 + echo "FAIL: counter icmp mismatch for veth$i" 1>&2 + ip netns exec "$gw" nft get element inet raw inicmp "{ 10.1.0.3 . \"veth$i\" . 10.3.0.99 }" 1>&2 + break + fi +done + +if ! ip netns exec "$gw" nft get element inet raw inicmp "{ 10.3.0.99 . \"veth0\" . 10.3.0.1 }" | grep -q "{ 10.3.0.99 . \"veth0\" . 10.3.0.1 counter packets $((3 * maxclients)) bytes $((252 * maxclients)) }"; then + ret=1 + echo "FAIL: counter icmp mismatch for veth0: { 10.3.0.99 . \"veth0\" . 10.3.0.1 counter packets $((3 * maxclients)) bytes $((252 * maxclients)) }" + ip netns exec "$gw" nft get element inet raw inicmp "{ 10.3.99 . \"veth0\" . 10.3.0.1 }" 1>&2 +fi + +if [ $ret -eq 0 ]; then + echo "PASS: ping test from all $maxclients namespaces" +fi + +if [ $have_socat -eq 0 ];then + echo "SKIP: socat not installed" + if [ $ret -ne 0 ];then + exit $ret + fi + exit $ksft_skip +fi + +listener_ready() +{ + ss -N "$1" -lnt -o "sport = :5201" | grep -q 5201 +} + +ip netns exec "$srv" socat -u TCP-LISTEN:5201,fork STDOUT > /dev/null 2>/dev/null & +socatpid=$! + +busywait 1000 listener_ready "$srv" + +for i in $(seq 1 "$maxclients"); do + if [ $ret -ne 0 ]; then + break + fi + cl=$(eval echo \$cl"$i") + if ! ip netns exec "$cl" socat -4 -u STDIN TCP:10.3.0.99:5201,sourceport=10000 < /dev/null > /dev/null; then + echo "FAIL: Failure to connect for $cl" 1>&2 + ip netns exec "$gw" conntrack -S 1>&2 + ret=1 + fi +done +if [ $ret -eq 0 ];then + echo "PASS: socat connections for all $maxclients net namespaces" +fi + +kill $socatpid +wait + +for i in $(seq 1 "$maxclients"); do + if ! ip netns exec "$gw" nft get element inet raw inflows "{ 10.1.0.3 . 10000 . \"veth$i\" . 10.3.0.99 . 5201 }" > /dev/null;then + ret=1 + echo "FAIL: can't find expected tcp entry for veth$i" 1>&2 + break + fi +done +if [ $ret -eq 0 ];then + echo "PASS: Found client connection for all $maxclients net namespaces" +fi + +if ! ip netns exec "$gw" nft get element inet raw inflows "{ 10.3.0.99 . 5201 . \"veth0\" . 10.3.0.1 . 10000 }" > /dev/null;then + ret=1 + echo "FAIL: cannot find return entry on veth0" 1>&2 +fi + +exit $ret |