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linux-headers-6.8.0-83
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wireguard
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netns.sh
#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. # # This script tests the below topology: # # ┌─────────────────────┐ ┌──────────────────────────────────┐ ┌─────────────────────┐ # │ $ns1 namespace │ │ $ns0 namespace │ │ $ns2 namespace │ # │ │ │ │ │ │ # │┌────────┐ │ │ ┌────────┐ │ │ ┌────────┐│ # ││ wg0 │───────────┼───┼────────────│ lo │────────────┼───┼───────────│ wg0 ││ # │├────────┴──────────┐│ │ ┌───────┴────────┴────────┐ │ │┌──────────┴────────┤│ # ││192.168.241.1/24 ││ │ │(ns1) (ns2) │ │ ││192.168.241.2/24 ││ # ││fd00::1/24 ││ │ │127.0.0.1:1 127.0.0.1:2│ │ ││fd00::2/24 ││ # │└───────────────────┘│ │ │[::]:1 [::]:2 │ │ │└───────────────────┘│ # └─────────────────────┘ │ └─────────────────────────┘ │ └─────────────────────┘ # └──────────────────────────────────┘ # # After the topology is prepared we run a series of TCP/UDP iperf3 tests between the # wireguard peers in $ns1 and $ns2. Note that $ns0 is the endpoint for the wg0 # interfaces in $ns1 and $ns2. See https://www.wireguard.com/netns/ for further # details on how this is accomplished. set -e shopt -s extglob exec 3>&1 export LANG=C export WG_HIDE_KEYS=never NPROC=( /sys/devices/system/cpu/cpu+([0-9]) ); NPROC=${#NPROC[@]} netns0="wg-test-$$-0" netns1="wg-test-$$-1" netns2="wg-test-$$-2" pretty() { echo -e "\x1b[32m\x1b[1m[+] ${1:+NS$1: }${2}\x1b[0m" >&3; } pp() { pretty "" "$*"; "$@"; } maybe_exec() { if [[ $BASHPID -eq $$ ]]; then "$@"; else exec "$@"; fi; } n0() { pretty 0 "$*"; maybe_exec ip netns exec $netns0 "$@"; } n1() { pretty 1 "$*"; maybe_exec ip netns exec $netns1 "$@"; } n2() { pretty 2 "$*"; maybe_exec ip netns exec $netns2 "$@"; } ip0() { pretty 0 "ip $*"; ip -n $netns0 "$@"; } ip1() { pretty 1 "ip $*"; ip -n $netns1 "$@"; } ip2() { pretty 2 "ip $*"; ip -n $netns2 "$@"; } sleep() { read -t "$1" -N 1 || true; } waitiperf() { pretty "${1//*-}" "wait for iperf:${3:-5201} pid $2"; while [[ $(ss -N "$1" -tlpH "sport = ${3:-5201}") != *\"iperf3\",pid=$2,fd=* ]]; do sleep 0.1; done; } waitncatudp() { pretty "${1//*-}" "wait for udp:1111 pid $2"; while [[ $(ss -N "$1" -ulpH 'sport = 1111') != *\"ncat\",pid=$2,fd=* ]]; do sleep 0.1; done; } waitiface() { pretty "${1//*-}" "wait for $2 to come up"; ip netns exec "$1" bash -c "while [[ \$(< \"/sys/class/net/$2/operstate\") != up ]]; do read -t .1 -N 0 || true; done;"; } cleanup() { set +e exec 2>/dev/null printf "$orig_message_cost" > /proc/sys/net/core/message_cost ip0 link del dev wg0 ip0 link del dev wg1 ip1 link del dev wg0 ip1 link del dev wg1 ip2 link del dev wg0 ip2 link del dev wg1 local to_kill="$(ip netns pids $netns0) $(ip netns pids $netns1) $(ip netns pids $netns2)" [[ -n $to_kill ]] && kill $to_kill pp ip netns del $netns1 pp ip netns del $netns2 pp ip netns del $netns0 exit } orig_message_cost="$(< /proc/sys/net/core/message_cost)" trap cleanup EXIT printf 0 > /proc/sys/net/core/message_cost ip netns del $netns0 2>/dev/null || true ip netns del $netns1 2>/dev/null || true ip netns del $netns2 2>/dev/null || true pp ip netns add $netns0 pp ip netns add $netns1 pp ip netns add $netns2 ip0 link set up dev lo ip0 link add dev wg0 type wireguard ip0 link set wg0 netns $netns1 ip0 link add dev wg0 type wireguard ip0 link set wg0 netns $netns2 key1="$(pp wg genkey)" key2="$(pp wg genkey)" key3="$(pp wg genkey)" key4="$(pp wg genkey)" pub1="$(pp wg pubkey <<<"$key1")" pub2="$(pp wg pubkey <<<"$key2")" pub3="$(pp wg pubkey <<<"$key3")" pub4="$(pp wg pubkey <<<"$key4")" psk="$(pp wg genpsk)" [[ -n $key1 && -n $key2 && -n $psk ]] configure_peers() { ip1 addr add 192.168.241.1/24 dev wg0 ip1 addr add fd00::1/112 dev wg0 ip2 addr add 192.168.241.2/24 dev wg0 ip2 addr add fd00::2/112 dev wg0 n1 wg set wg0 \ private-key <(echo "$key1") \ listen-port 1 \ peer "$pub2" \ preshared-key <(echo "$psk") \ allowed-ips 192.168.241.2/32,fd00::2/128 n2 wg set wg0 \ private-key <(echo "$key2") \ listen-port 2 \ peer "$pub1" \ preshared-key <(echo "$psk") \ allowed-ips 192.168.241.1/32,fd00::1/128 ip1 link set up dev wg0 ip2 link set up dev wg0 } configure_peers tests() { # Ping over IPv4 n2 ping -c 10 -f -W 1 192.168.241.1 n1 ping -c 10 -f -W 1 192.168.241.2 # Ping over IPv6 n2 ping6 -c 10 -f -W 1 fd00::1 n1 ping6 -c 10 -f -W 1 fd00::2 # TCP over IPv4 n2 iperf3 -s -1 -B 192.168.241.2 & waitiperf $netns2 $! n1 iperf3 -Z -t 3 -c 192.168.241.2 # TCP over IPv6 n1 iperf3 -s -1 -B fd00::1 & waitiperf $netns1 $! n2 iperf3 -Z -t 3 -c fd00::1 # UDP over IPv4 n1 iperf3 -s -1 -B 192.168.241.1 & waitiperf $netns1 $! n2 iperf3 -Z -t 3 -b 0 -u -c 192.168.241.1 # UDP over IPv6 n2 iperf3 -s -1 -B fd00::2 & waitiperf $netns2 $! n1 iperf3 -Z -t 3 -b 0 -u -c fd00::2 # TCP over IPv4, in parallel local pids=( ) i for ((i=0; i < NPROC; ++i)) do n2 iperf3 -p $(( 5200 + i )) -s -1 -B 192.168.241.2 & pids+=( $! ); waitiperf $netns2 $! $(( 5200 + i )) done for ((i=0; i < NPROC; ++i)) do n1 iperf3 -Z -t 3 -p $(( 5200 + i )) -c 192.168.241.2 & done wait "${pids[@]}" } [[ $(ip1 link show dev wg0) =~ mtu\ ([0-9]+) ]] && orig_mtu="${BASH_REMATCH[1]}" big_mtu=$(( 34816 - 1500 + $orig_mtu )) # Test using IPv4 as outer transport n1 wg set wg0 peer "$pub2" endpoint 127.0.0.1:2 n2 wg set wg0 peer "$pub1" endpoint 127.0.0.1:1 # Before calling tests, we first make sure that the stats counters and timestamper are working n2 ping -c 10 -f -W 1 192.168.241.1 { read _; read _; read _; read rx_bytes _; read _; read tx_bytes _; } < <(ip2 -stats link show dev wg0) (( rx_bytes == 1372 && (tx_bytes == 1428 || tx_bytes == 1460) )) { read _; read _; read _; read rx_bytes _; read _; read tx_bytes _; } < <(ip1 -stats link show dev wg0) (( tx_bytes == 1372 && (rx_bytes == 1428 || rx_bytes == 1460) )) read _ rx_bytes tx_bytes < <(n2 wg show wg0 transfer) (( rx_bytes == 1372 && (tx_bytes == 1428 || tx_bytes == 1460) )) read _ rx_bytes tx_bytes < <(n1 wg show wg0 transfer) (( tx_bytes == 1372 && (rx_bytes == 1428 || rx_bytes == 1460) )) read _ timestamp < <(n1 wg show wg0 latest-handshakes) (( timestamp != 0 )) tests ip1 link set wg0 mtu $big_mtu ip2 link set wg0 mtu $big_mtu tests ip1 link set wg0 mtu $orig_mtu ip2 link set wg0 mtu $orig_mtu # Test using IPv6 as outer transport n1 wg set wg0 peer "$pub2" endpoint [::1]:2 n2 wg set wg0 peer "$pub1" endpoint [::1]:1 tests ip1 link set wg0 mtu $big_mtu ip2 link set wg0 mtu $big_mtu tests # Test that route MTUs work with the padding ip1 link set wg0 mtu 1300 ip2 link set wg0 mtu 1300 n1 wg set wg0 peer "$pub2" endpoint 127.0.0.1:2 n2 wg set wg0 peer "$pub1" endpoint 127.0.0.1:1 n0 iptables -A INPUT -m length --length 1360 -j DROP n1 ip route add 192.168.241.2/32 dev wg0 mtu 1299 n2 ip route add 192.168.241.1/32 dev wg0 mtu 1299 n2 ping -c 1 -W 1 -s 1269 192.168.241.1 n2 ip route delete 192.168.241.1/32 dev wg0 mtu 1299 n1 ip route delete 192.168.241.2/32 dev wg0 mtu 1299 n0 iptables -F INPUT ip1 link set wg0 mtu $orig_mtu ip2 link set wg0 mtu $orig_mtu # Test using IPv4 that roaming works ip0 -4 addr del 127.0.0.1/8 dev lo ip0 -4 addr add 127.212.121.99/8 dev lo n1 wg set wg0 listen-port 9999 n1 wg set wg0 peer "$pub2" endpoint 127.0.0.1:2 n1 ping6 -W 1 -c 1 fd00::2 [[ $(n2 wg show wg0 endpoints) == "$pub1 127.212.121.99:9999" ]] # Test using IPv6 that roaming works n1 wg set wg0 listen-port 9998 n1 wg set wg0 peer "$pub2" endpoint [::1]:2 n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 [::1]:9998" ]] # Test that crypto-RP filter works n1 wg set wg0 peer "$pub2" allowed-ips 192.168.241.0/24 exec 4< <(n1 ncat -l -u -p 1111) ncat_pid=$! waitncatudp $netns1 $ncat_pid n2 ncat -u 192.168.241.1 1111 <<<"X" read -r -N 1 -t 1 out <&4 && [[ $out == "X" ]] kill $ncat_pid more_specific_key="$(pp wg genkey | pp wg pubkey)" n1 wg set wg0 peer "$more_specific_key" allowed-ips 192.168.241.2/32 n2 wg set wg0 listen-port 9997 exec 4< <(n1 ncat -l -u -p 1111) ncat_pid=$! waitncatudp $netns1 $ncat_pid n2 ncat -u 192.168.241.1 1111 <<<"X" ! read -r -N 1 -t 1 out <&4 || false kill $ncat_pid n1 wg set wg0 peer "$more_specific_key" remove [[ $(n1 wg show wg0 endpoints) == "$pub2 [::1]:9997" ]] # Test that we can change private keys keys and immediately handshake n1 wg set wg0 private-key <(echo "$key1") peer "$pub2" preshared-key <(echo "$psk") allowed-ips 192.168.241.2/32 endpoint 127.0.0.1:2 n2 wg set wg0 private-key <(echo "$key2") listen-port 2 peer "$pub1" preshared-key <(echo "$psk") allowed-ips 192.168.241.1/32 n1 ping -W 1 -c 1 192.168.241.2 n1 wg set wg0 private-key <(echo "$key3") n2 wg set wg0 peer "$pub3" preshared-key <(echo "$psk") allowed-ips 192.168.241.1/32 peer "$pub1" remove n1 ping -W 1 -c 1 192.168.241.2 n2 wg set wg0 peer "$pub3" remove # Test that we can route wg through wg ip1 addr flush dev wg0 ip2 addr flush dev wg0 ip1 addr add fd00::5:1/112 dev wg0 ip2 addr add fd00::5:2/112 dev wg0 n1 wg set wg0 private-key <(echo "$key1") peer "$pub2" preshared-key <(echo "$psk") allowed-ips fd00::5:2/128 endpoint 127.0.0.1:2 n2 wg set wg0 private-key <(echo "$key2") listen-port 2 peer "$pub1" preshared-key <(echo "$psk") allowed-ips fd00::5:1/128 endpoint 127.212.121.99:9998 ip1 link add wg1 type wireguard ip2 link add wg1 type wireguard ip1 addr add 192.168.241.1/24 dev wg1 ip1 addr add fd00::1/112 dev wg1 ip2 addr add 192.168.241.2/24 dev wg1 ip2 addr add fd00::2/112 dev wg1 ip1 link set mtu 1340 up dev wg1 ip2 link set mtu 1340 up dev wg1 n1 wg set wg1 listen-port 5 private-key <(echo "$key3") peer "$pub4" allowed-ips 192.168.241.2/32,fd00::2/128 endpoint [fd00::5:2]:5 n2 wg set wg1 listen-port 5 private-key <(echo "$key4") peer "$pub3" allowed-ips 192.168.241.1/32,fd00::1/128 endpoint [fd00::5:1]:5 tests # Try to set up a routing loop between the two namespaces ip1 link set netns $netns0 dev wg1 ip0 addr add 192.168.241.1/24 dev wg1 ip0 link set up dev wg1 n0 ping -W 1 -c 1 192.168.241.2 n1 wg set wg0 peer "$pub2" endpoint 192.168.241.2:7 ip2 link del wg0 ip2 link del wg1 read _ _ tx_bytes_before < <(n0 wg show wg1 transfer) ! n0 ping -W 1 -c 10 -f 192.168.241.2 || false sleep 1 read _ _ tx_bytes_after < <(n0 wg show wg1 transfer) if ! (( tx_bytes_after - tx_bytes_before < 70000 )); then errstart=$'\x1b[37m\x1b[41m\x1b[1m' errend=$'\x1b[0m' echo "${errstart} ${errend}" echo "${errstart} E R R O R ${errend}" echo "${errstart} ${errend}" echo "${errstart} This architecture does not do the right thing ${errend}" echo "${errstart} with cross-namespace routing loops. This test ${errend}" echo "${errstart} has thus technically failed but, as this issue ${errend}" echo "${errstart} is as yet unsolved, these tests will continue ${errend}" echo "${errstart} onward. :( ${errend}" echo "${errstart} ${errend}" fi ip0 link del wg1 ip1 link del wg0 # Test using NAT. We now change the topology to this: # ┌────────────────────────────────────────┐ ┌────────────────────────────────────────────────┐ ┌────────────────────────────────────────┐ # │ $ns1 namespace │ │ $ns0 namespace │ │ $ns2 namespace │ # │ │ │ │ │ │ # │ ┌─────┐ ┌─────┐ │ │ ┌──────┐ ┌──────┐ │ │ ┌─────┐ ┌─────┐ │ # │ │ wg0 │─────────────│vethc│───────────┼────┼────│vethrc│ │vethrs│──────────────┼─────┼──│veths│────────────│ wg0 │ │ # │ ├─────┴──────────┐ ├─────┴──────────┐│ │ ├──────┴─────────┐ ├──────┴────────────┐ │ │ ├─────┴──────────┐ ├─────┴──────────┐ │ # │ │192.168.241.1/24│ │192.168.1.100/24││ │ │192.168.1.1/24 │ │10.0.0.1/24 │ │ │ │10.0.0.100/24 │ │192.168.241.2/24│ │ # │ │fd00::1/24 │ │ ││ │ │ │ │SNAT:192.168.1.0/24│ │ │ │ │ │fd00::2/24 │ │ # │ └────────────────┘ └────────────────┘│ │ └────────────────┘ └───────────────────┘ │ │ └────────────────┘ └────────────────┘ │ # └────────────────────────────────────────┘ └────────────────────────────────────────────────┘ └────────────────────────────────────────┘ ip1 link add dev wg0 type wireguard ip2 link add dev wg0 type wireguard configure_peers ip0 link add vethrc type veth peer name vethc ip0 link add vethrs type veth peer name veths ip0 link set vethc netns $netns1 ip0 link set veths netns $netns2 ip0 link set vethrc up ip0 link set vethrs up ip0 addr add 192.168.1.1/24 dev vethrc ip0 addr add 10.0.0.1/24 dev vethrs ip1 addr add 192.168.1.100/24 dev vethc ip1 link set vethc up ip1 route add default via 192.168.1.1 ip2 addr add 10.0.0.100/24 dev veths ip2 link set veths up waitiface $netns0 vethrc waitiface $netns0 vethrs waitiface $netns1 vethc waitiface $netns2 veths n0 bash -c 'printf 1 > /proc/sys/net/ipv4/ip_forward' [[ -e /proc/sys/net/netfilter/nf_conntrack_udp_timeout ]] || modprobe nf_conntrack n0 bash -c 'printf 2 > /proc/sys/net/netfilter/nf_conntrack_udp_timeout' n0 bash -c 'printf 2 > /proc/sys/net/netfilter/nf_conntrack_udp_timeout_stream' n0 iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -d 10.0.0.0/24 -j SNAT --to 10.0.0.1 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.100:2 persistent-keepalive 1 n1 ping -W 1 -c 1 192.168.241.2 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] # Demonstrate n2 can still send packets to n1, since persistent-keepalive will prevent connection tracking entry from expiring (to see entries: `n0 conntrack -L`). pp sleep 3 n2 ping -W 1 -c 1 192.168.241.1 n1 wg set wg0 peer "$pub2" persistent-keepalive 0 # Test that sk_bound_dev_if works n1 ping -I wg0 -c 1 -W 1 192.168.241.2 # What about when the mark changes and the packet must be rerouted? n1 iptables -t mangle -I OUTPUT -j MARK --set-xmark 1 n1 ping -c 1 -W 1 192.168.241.2 # First the boring case n1 ping -I wg0 -c 1 -W 1 192.168.241.2 # Then the sk_bound_dev_if case n1 iptables -t mangle -D OUTPUT -j MARK --set-xmark 1 # Test that onion routing works, even when it loops n1 wg set wg0 peer "$pub3" allowed-ips 192.168.242.2/32 endpoint 192.168.241.2:5 ip1 addr add 192.168.242.1/24 dev wg0 ip2 link add wg1 type wireguard ip2 addr add 192.168.242.2/24 dev wg1 n2 wg set wg1 private-key <(echo "$key3") listen-port 5 peer "$pub1" allowed-ips 192.168.242.1/32 ip2 link set wg1 up n1 ping -W 1 -c 1 192.168.242.2 ip2 link del wg1 n1 wg set wg0 peer "$pub3" endpoint 192.168.242.2:5 ! n1 ping -W 1 -c 1 192.168.242.2 || false # Should not crash kernel n1 wg set wg0 peer "$pub3" remove ip1 addr del 192.168.242.1/24 dev wg0 # Do a wg-quick(8)-style policy routing for the default route, making sure vethc has a v6 address to tease out bugs. ip1 -6 addr add fc00::9/96 dev vethc ip1 -6 route add default via fc00::1 ip2 -4 addr add 192.168.99.7/32 dev wg0 ip2 -6 addr add abab::1111/128 dev wg0 n1 wg set wg0 fwmark 51820 peer "$pub2" allowed-ips 192.168.99.7,abab::1111 ip1 -6 route add default dev wg0 table 51820 ip1 -6 rule add not fwmark 51820 table 51820 ip1 -6 rule add table main suppress_prefixlength 0 ip1 -4 route add default dev wg0 table 51820 ip1 -4 rule add not fwmark 51820 table 51820 ip1 -4 rule add table main suppress_prefixlength 0 n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/vethc/rp_filter' # Flood the pings instead of sending just one, to trigger routing table reference counting bugs. n1 ping -W 1 -c 100 -f 192.168.99.7 n1 ping -W 1 -c 100 -f abab::1111 # Have ns2 NAT into wg0 packets from ns0, but return an icmp error along the right route. n2 iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -d 192.168.241.0/24 -j SNAT --to 192.168.241.2 n0 iptables -t filter -A INPUT \! -s 10.0.0.0/24 -i vethrs -j DROP # Manual rpfilter just to be explicit. n2 bash -c 'printf 1 > /proc/sys/net/ipv4/ip_forward' ip0 -4 route add 192.168.241.1 via 10.0.0.100 n2 wg set wg0 peer "$pub1" remove [[ $(! n0 ping -W 1 -c 1 192.168.241.1 || false) == *"From 10.0.0.100 icmp_seq=1 Destination Host Unreachable"* ]] n0 iptables -t nat -F n0 iptables -t filter -F n2 iptables -t nat -F ip0 link del vethrc ip0 link del vethrs ip1 link del wg0 ip2 link del wg0 # Test that saddr routing is sticky but not too sticky, changing to this topology: # ┌────────────────────────────────────────┐ ┌────────────────────────────────────────┐ # │ $ns1 namespace │ │ $ns2 namespace │ # │ │ │ │ # │ ┌─────┐ ┌─────┐ │ │ ┌─────┐ ┌─────┐ │ # │ │ wg0 │─────────────│veth1│───────────┼────┼──│veth2│────────────│ wg0 │ │ # │ ├─────┴──────────┐ ├─────┴──────────┐│ │ ├─────┴──────────┐ ├─────┴──────────┐ │ # │ │192.168.241.1/24│ │10.0.0.1/24 ││ │ │10.0.0.2/24 │ │192.168.241.2/24│ │ # │ │fd00::1/24 │ │fd00:aa::1/96 ││ │ │fd00:aa::2/96 │ │fd00::2/24 │ │ # │ └────────────────┘ └────────────────┘│ │ └────────────────┘ └────────────────┘ │ # └────────────────────────────────────────┘ └────────────────────────────────────────┘ ip1 link add dev wg0 type wireguard ip2 link add dev wg0 type wireguard configure_peers ip1 link add veth1 type veth peer name veth2 ip1 link set veth2 netns $netns2 n1 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/all/accept_dad' n2 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/all/accept_dad' n1 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/veth1/accept_dad' n2 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/veth2/accept_dad' n1 bash -c 'printf 1 > /proc/sys/net/ipv4/conf/veth1/promote_secondaries' # First we check that we aren't overly sticky and can fall over to new IPs when old ones are removed ip1 addr add 10.0.0.1/24 dev veth1 ip1 addr add fd00:aa::1/96 dev veth1 ip2 addr add 10.0.0.2/24 dev veth2 ip2 addr add fd00:aa::2/96 dev veth2 ip1 link set veth1 up ip2 link set veth2 up waitiface $netns1 veth1 waitiface $netns2 veth2 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.2:2 n1 ping -W 1 -c 1 192.168.241.2 ip1 addr add 10.0.0.10/24 dev veth1 ip1 addr del 10.0.0.1/24 dev veth1 n1 ping -W 1 -c 1 192.168.241.2 n1 wg set wg0 peer "$pub2" endpoint [fd00:aa::2]:2 n1 ping -W 1 -c 1 192.168.241.2 ip1 addr add fd00:aa::10/96 dev veth1 ip1 addr del fd00:aa::1/96 dev veth1 n1 ping -W 1 -c 1 192.168.241.2 # Now we show that we can successfully do reply to sender routing ip1 link set veth1 down ip2 link set veth2 down ip1 addr flush dev veth1 ip2 addr flush dev veth2 ip1 addr add 10.0.0.1/24 dev veth1 ip1 addr add 10.0.0.2/24 dev veth1 ip1 addr add fd00:aa::1/96 dev veth1 ip1 addr add fd00:aa::2/96 dev veth1 ip2 addr add 10.0.0.3/24 dev veth2 ip2 addr add fd00:aa::3/96 dev veth2 ip1 link set veth1 up ip2 link set veth2 up waitiface $netns1 veth1 waitiface $netns2 veth2 n2 wg set wg0 peer "$pub1" endpoint 10.0.0.1:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] n2 wg set wg0 peer "$pub1" endpoint [fd00:aa::1]:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 [fd00:aa::1]:1" ]] n2 wg set wg0 peer "$pub1" endpoint 10.0.0.2:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.2:1" ]] n2 wg set wg0 peer "$pub1" endpoint [fd00:aa::2]:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 [fd00:aa::2]:1" ]] # What happens if the inbound destination address belongs to a different interface as the default route? ip1 link add dummy0 type dummy ip1 addr add 10.50.0.1/24 dev dummy0 ip1 link set dummy0 up ip2 route add 10.50.0.0/24 dev veth2 n2 wg set wg0 peer "$pub1" endpoint 10.50.0.1:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.50.0.1:1" ]] ip1 link del dummy0 ip1 addr flush dev veth1 ip2 addr flush dev veth2 ip1 route flush dev veth1 ip2 route flush dev veth2 # Now we see what happens if another interface route takes precedence over an ongoing one ip1 link add veth3 type veth peer name veth4 ip1 link set veth4 netns $netns2 ip1 addr add 10.0.0.1/24 dev veth1 ip2 addr add 10.0.0.2/24 dev veth2 ip1 addr add 10.0.0.3/24 dev veth3 ip1 link set veth1 up ip2 link set veth2 up ip1 link set veth3 up ip2 link set veth4 up waitiface $netns1 veth1 waitiface $netns2 veth2 waitiface $netns1 veth3 waitiface $netns2 veth4 ip1 route flush dev veth1 ip1 route flush dev veth3 ip1 route add 10.0.0.0/24 dev veth1 src 10.0.0.1 metric 2 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.2:2 n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] ip1 route add 10.0.0.0/24 dev veth3 src 10.0.0.3 metric 1 n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/veth1/rp_filter' n2 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/veth4/rp_filter' n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/all/rp_filter' n2 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/all/rp_filter' n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.3:1" ]] ip1 link del dev veth3 ip1 link del dev wg0 ip2 link del dev wg0 # Make sure persistent keep alives are sent when an adapter comes up ip1 link add dev wg0 type wireguard n1 wg set wg0 private-key <(echo "$key1") peer "$pub2" endpoint 10.0.0.1:1 persistent-keepalive 1 read _ _ tx_bytes < <(n1 wg show wg0 transfer) [[ $tx_bytes -eq 0 ]] ip1 link set dev wg0 up read _ _ tx_bytes < <(n1 wg show wg0 transfer) [[ $tx_bytes -gt 0 ]] ip1 link del dev wg0 # This should also happen even if the private key is set later ip1 link add dev wg0 type wireguard n1 wg set wg0 peer "$pub2" endpoint 10.0.0.1:1 persistent-keepalive 1 read _ _ tx_bytes < <(n1 wg show wg0 transfer) [[ $tx_bytes -eq 0 ]] ip1 link set dev wg0 up read _ _ tx_bytes < <(n1 wg show wg0 transfer) [[ $tx_bytes -eq 0 ]] n1 wg set wg0 private-key <(echo "$key1") read _ _ tx_bytes < <(n1 wg show wg0 transfer) [[ $tx_bytes -gt 0 ]] ip1 link del dev veth1 ip1 link del dev wg0 # We test that Netlink/IPC is working properly by doing things that usually cause split responses ip0 link add dev wg0 type wireguard config=( "[Interface]" "PrivateKey=$(wg genkey)" "[Peer]" "PublicKey=$(wg genkey)" ) for a in {1..255}; do for b in {0..255}; do config+=( "AllowedIPs=$a.$b.0.0/16,$a::$b/128" ) done done n0 wg setconf wg0 <(printf '%s\n' "${config[@]}") i=0 for ip in $(n0 wg show wg0 allowed-ips); do ((++i)) done ((i == 255*256*2+1)) ip0 link del wg0 ip0 link add dev wg0 type wireguard config=( "[Interface]" "PrivateKey=$(wg genkey)" ) for a in {1..40}; do config+=( "[Peer]" "PublicKey=$(wg genkey)" ) for b in {1..52}; do config+=( "AllowedIPs=$a.$b.0.0/16" ) done done n0 wg setconf wg0 <(printf '%s\n' "${config[@]}") i=0 while read -r line; do j=0 for ip in $line; do ((++j)) done ((j == 53)) ((++i)) done < <(n0 wg show wg0 allowed-ips) ((i == 40)) ip0 link del wg0 ip0 link add wg0 type wireguard config=( ) for i in {1..29}; do config+=( "[Peer]" "PublicKey=$(wg genkey)" ) done config+=( "[Peer]" "PublicKey=$(wg genkey)" "AllowedIPs=255.2.3.4/32,abcd::255/128" ) n0 wg setconf wg0 <(printf '%s\n' "${config[@]}") n0 wg showconf wg0 > /dev/null ip0 link del wg0 allowedips=( ) for i in {1..197}; do allowedips+=( abcd::$i ) done saved_ifs="$IFS" IFS=, allowedips="${allowedips[*]}" IFS="$saved_ifs" ip0 link add wg0 type wireguard n0 wg set wg0 peer "$pub1" n0 wg set wg0 peer "$pub2" allowed-ips "$allowedips" { read -r pub allowedips [[ $pub == "$pub1" && $allowedips == "(none)" ]] read -r pub allowedips [[ $pub == "$pub2" ]] i=0 for _ in $allowedips; do ((++i)) done ((i == 197)) } < <(n0 wg show wg0 allowed-ips) ip0 link del wg0 ! n0 wg show doesnotexist || false ip0 link add wg0 type wireguard n0 wg set wg0 private-key <(echo "$key1") peer "$pub2" preshared-key <(echo "$psk") [[ $(n0 wg show wg0 private-key) == "$key1" ]] [[ $(n0 wg show wg0 preshared-keys) == "$pub2 $psk" ]] n0 wg set wg0 private-key /dev/null peer "$pub2" preshared-key /dev/null [[ $(n0 wg show wg0 private-key) == "(none)" ]] [[ $(n0 wg show wg0 preshared-keys) == "$pub2 (none)" ]] n0 wg set wg0 peer "$pub2" n0 wg set wg0 private-key <(echo "$key2") [[ $(n0 wg show wg0 public-key) == "$pub2" ]] [[ -z $(n0 wg show wg0 peers) ]] n0 wg set wg0 peer "$pub2" [[ -z $(n0 wg show wg0 peers) ]] n0 wg set wg0 private-key <(echo "$key1") n0 wg set wg0 peer "$pub2" [[ $(n0 wg show wg0 peers) == "$pub2" ]] n0 wg set wg0 private-key <(echo "/${key1:1}") [[ $(n0 wg show wg0 private-key) == "+${key1:1}" ]] n0 wg set wg0 peer "$pub2" allowed-ips 0.0.0.0/0,10.0.0.0/8,100.0.0.0/10,172.16.0.0/12,192.168.0.0/16 n0 wg set wg0 peer "$pub2" allowed-ips 0.0.0.0/0 n0 wg set wg0 peer "$pub2" allowed-ips ::/0,1700::/111,5000::/4,e000::/37,9000::/75 n0 wg set wg0 peer "$pub2" allowed-ips ::/0 n0 wg set wg0 peer "$pub2" remove for low_order_point in AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA= 4Ot6fDtBuK4WVuP68Z/EatoJjeucMrH9hmIFFl9JuAA= X5yVvKNQjCSx0LFVnIPvWwREXMRYHI6G2CJO3dCfEVc= 7P///////////////////////////////////////38= 7f///////////////////////////////////////38= 7v///////////////////////////////////////38=; do n0 wg set wg0 peer "$low_order_point" persistent-keepalive 1 endpoint 127.0.0.1:1111 done [[ -n $(n0 wg show wg0 peers) ]] exec 4< <(n0 ncat -l -u -p 1111) ncat_pid=$! waitncatudp $netns0 $ncat_pid ip0 link set wg0 up ! read -r -n 1 -t 2 <&4 || false kill $ncat_pid ip0 link del wg0 # Ensure that dst_cache references don't outlive netns lifetime ip1 link add dev wg0 type wireguard ip2 link add dev wg0 type wireguard configure_peers ip1 link add veth1 type veth peer name veth2 ip1 link set veth2 netns $netns2 ip1 addr add fd00:aa::1/64 dev veth1 ip2 addr add fd00:aa::2/64 dev veth2 ip1 link set veth1 up ip2 link set veth2 up waitiface $netns1 veth1 waitiface $netns2 veth2 ip1 -6 route add default dev veth1 via fd00:aa::2 ip2 -6 route add default dev veth2 via fd00:aa::1 n1 wg set wg0 peer "$pub2" endpoint [fd00:aa::2]:2 n2 wg set wg0 peer "$pub1" endpoint [fd00:aa::1]:1 n1 ping6 -c 1 fd00::2 pp ip netns delete $netns1 pp ip netns delete $netns2 pp ip netns add $netns1 pp ip netns add $netns2 # Ensure there aren't circular reference loops ip1 link add wg1 type wireguard ip2 link add wg2 type wireguard ip1 link set wg1 netns $netns2 ip2 link set wg2 netns $netns1 pp ip netns delete $netns1 pp ip netns delete $netns2 pp ip netns add $netns1 pp ip netns add $netns2 sleep 2 # Wait for cleanup and grace periods declare -A objects while read -t 0.1 -r line 2>/dev/null || [[ $? -ne 142 ]]; do [[ $line =~ .*(wg[0-9]+:\ [A-Z][a-z]+\ ?[0-9]*)\ .*(created|destroyed).* ]] || continue objects["${BASH_REMATCH[1]}"]+="${BASH_REMATCH[2]}" done < /dev/kmsg alldeleted=1 for object in "${!objects[@]}"; do if [[ ${objects["$object"]} != *createddestroyed && ${objects["$object"]} != *createdcreateddestroyeddestroyed ]]; then echo "Error: $object: merely ${objects["$object"]}" >&3 alldeleted=0 fi done [[ $alldeleted -eq 1 ]] pretty "" "Objects that were created were also destroyed."
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