mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 03:25:35 +00:00
fbfee6a8c0
This migrates containerboot to reuse the NetfilterRunner used by tailscaled instead of manipulating iptables rule itself. This has the added advantage of now working with nftables and we can potentially drop the `iptables` command from the container image in the future. Updates #9310 Co-authored-by: Irbe Krumina <irbe@tailscale.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>
1082 lines
30 KiB
Go
1082 lines
30 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package router
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import (
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"errors"
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"fmt"
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"math/rand"
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"net/netip"
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"os"
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"reflect"
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"regexp"
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"slices"
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"sort"
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"strings"
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"sync"
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"sync/atomic"
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"testing"
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"github.com/google/go-cmp/cmp"
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"github.com/tailscale/wireguard-go/tun"
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"github.com/vishvananda/netlink"
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"go4.org/netipx"
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"tailscale.com/net/netmon"
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"tailscale.com/net/tsaddr"
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"tailscale.com/tstest"
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"tailscale.com/types/logger"
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"tailscale.com/util/linuxfw"
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)
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func TestRouterStates(t *testing.T) {
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basic := `
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ip rule add -4 pref 5210 fwmark 0x80000/0xff0000 table main
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ip rule add -4 pref 5230 fwmark 0x80000/0xff0000 table default
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ip rule add -4 pref 5250 fwmark 0x80000/0xff0000 type unreachable
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ip rule add -4 pref 5270 table 52
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ip rule add -6 pref 5210 fwmark 0x80000/0xff0000 table main
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ip rule add -6 pref 5230 fwmark 0x80000/0xff0000 table default
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ip rule add -6 pref 5250 fwmark 0x80000/0xff0000 type unreachable
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ip rule add -6 pref 5270 table 52
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`
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states := []struct {
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name string
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in *Config
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want string
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}{
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{
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name: "no config",
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in: nil,
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want: `
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up` + basic,
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},
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{
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name: "local addr only",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0` + basic,
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},
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{
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name: "addr and routes",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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Routes: mustCIDRs("100.100.100.100/32", "192.168.16.0/24"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add 192.168.16.0/24 dev tailscale0 table 52` + basic,
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},
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{
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name: "addr and routes and subnet routes",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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Routes: mustCIDRs("100.100.100.100/32", "192.168.16.0/24"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add 192.168.16.0/24 dev tailscale0 table 52` + basic,
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},
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{
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name: "addr and routes and subnet routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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SNATSubnetRoutes: true,
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v4/nat/ts-postrouting -m mark --mark 0x40000/0xff0000 -j MASQUERADE
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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v6/nat/ts-postrouting -m mark --mark 0x40000/0xff0000 -j MASQUERADE
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`,
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},
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{
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name: "addr and routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes and subnet routes with netfilter but no SNAT",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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SNATSubnetRoutes: false,
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes with half netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterNoDivert,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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`,
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},
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{
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name: "addr and routes with netfilter2",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr, routes, and local routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "0.0.0.0/0"),
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LocalRoutes: mustCIDRs("10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 0.0.0.0/0 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add throw 10.0.0.0/8 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v4/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000/0xff0000
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v6/filter/ts-forward -m mark --mark 0x40000/0xff0000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr, routes, and local routes with no netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "0.0.0.0/0"),
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LocalRoutes: mustCIDRs("10.0.0.0/8", "192.168.0.0/24"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 0.0.0.0/0 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add throw 10.0.0.0/8 table 52
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ip route add throw 192.168.0.0/24 table 52` + basic,
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},
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}
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mon, err := netmon.New(logger.Discard)
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if err != nil {
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t.Fatal(err)
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}
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mon.Start()
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defer mon.Close()
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fake := NewFakeOS(t)
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router, err := newUserspaceRouterAdvanced(t.Logf, "tailscale0", mon, fake.nfr, fake)
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if err != nil {
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t.Fatalf("failed to create router: %v", err)
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}
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if err := router.Up(); err != nil {
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t.Fatalf("failed to up router: %v", err)
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}
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|
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testState := func(t *testing.T, i int) {
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t.Helper()
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if err := router.Set(states[i].in); err != nil {
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t.Fatalf("failed to set router config: %v", err)
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}
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got := fake.String()
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want := adjustFwmask(t, strings.TrimSpace(states[i].want))
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if diff := cmp.Diff(got, want); diff != "" {
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t.Fatalf("unexpected OS state (-got+want):\n%s", diff)
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}
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}
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|
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for i, state := range states {
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t.Run(state.name, func(t *testing.T) { testState(t, i) })
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}
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|
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// Cycle through a bunch of states in pseudorandom order, to
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// verify that we transition cleanly from state to state no matter
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// the order.
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for randRun := 0; randRun < 5*len(states); randRun++ {
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i := rand.Intn(len(states))
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state := states[i]
|
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t.Run(state.name, func(t *testing.T) { testState(t, i) })
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}
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}
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|
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type fakeIPTablesRunner struct {
|
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t *testing.T
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ipt4 map[string][]string
|
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ipt6 map[string][]string
|
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//we always assume ipv6 and ipv6 nat are enabled when testing
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}
|
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|
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func newIPTablesRunner(t *testing.T) linuxfw.NetfilterRunner {
|
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return &fakeIPTablesRunner{
|
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t: t,
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ipt4: map[string][]string{
|
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"filter/INPUT": nil,
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"filter/OUTPUT": nil,
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"filter/FORWARD": nil,
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"nat/PREROUTING": nil,
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"nat/OUTPUT": nil,
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"nat/POSTROUTING": nil,
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},
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ipt6: map[string][]string{
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"filter/INPUT": nil,
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"filter/OUTPUT": nil,
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"filter/FORWARD": nil,
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"nat/PREROUTING": nil,
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"nat/OUTPUT": nil,
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"nat/POSTROUTING": nil,
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},
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}
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}
|
|
|
|
func insertRule(n *fakeIPTablesRunner, curIPT map[string][]string, chain, newRule string) error {
|
|
// Get current rules for filter/ts-input chain with according IP version
|
|
curTSInputRules, ok := curIPT[chain]
|
|
if !ok {
|
|
n.t.Fatalf("no %s chain exists", chain)
|
|
return fmt.Errorf("no %s chain exists", chain)
|
|
}
|
|
|
|
// Add new rule to top of filter/ts-input
|
|
curTSInputRules = append(curTSInputRules, "")
|
|
copy(curTSInputRules[1:], curTSInputRules)
|
|
curTSInputRules[0] = newRule
|
|
curIPT[chain] = curTSInputRules
|
|
return nil
|
|
}
|
|
|
|
func appendRule(n *fakeIPTablesRunner, curIPT map[string][]string, chain, newRule string) error {
|
|
// Get current rules for filter/ts-input chain with according IP version
|
|
curTSInputRules, ok := curIPT[chain]
|
|
if !ok {
|
|
n.t.Fatalf("no %s chain exists", chain)
|
|
return fmt.Errorf("no %s chain exists", chain)
|
|
}
|
|
|
|
// Add new rule to end of filter/ts-input
|
|
curTSInputRules = append(curTSInputRules, newRule)
|
|
curIPT[chain] = curTSInputRules
|
|
return nil
|
|
}
|
|
|
|
func deleteRule(n *fakeIPTablesRunner, curIPT map[string][]string, chain, delRule string) error {
|
|
// Get current rules for filter/ts-input chain with according IP version
|
|
curTSInputRules, ok := curIPT[chain]
|
|
if !ok {
|
|
n.t.Fatalf("no %s chain exists", chain)
|
|
return fmt.Errorf("no %s chain exists", chain)
|
|
}
|
|
|
|
// Remove rule from filter/ts-input
|
|
for i, rule := range curTSInputRules {
|
|
if rule == delRule {
|
|
curTSInputRules = append(curTSInputRules[:i], curTSInputRules[i+1:]...)
|
|
break
|
|
}
|
|
}
|
|
curIPT[chain] = curTSInputRules
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddLoopbackRule(addr netip.Addr) error {
|
|
curIPT := n.ipt4
|
|
if addr.Is6() {
|
|
curIPT = n.ipt6
|
|
}
|
|
newRule := fmt.Sprintf("-i lo -s %s -j ACCEPT", addr.String())
|
|
|
|
return insertRule(n, curIPT, "filter/ts-input", newRule)
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddBase(tunname string) error {
|
|
if err := n.addBase4(tunname); err != nil {
|
|
return err
|
|
}
|
|
if n.HasIPV6() {
|
|
if err := n.addBase6(tunname); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddDNATRule(origDst, dst netip.Addr) error {
|
|
return errors.New("not implemented")
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddSNATRuleForDst(src, dst netip.Addr) error {
|
|
return errors.New("not implemented")
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DNATNonTailscaleTraffic(exemptInterface string, dst netip.Addr) error {
|
|
return errors.New("not implemented")
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) ClampMSSToPMTU(tun string, addr netip.Addr) error {
|
|
return errors.New("not implemented")
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) addBase4(tunname string) error {
|
|
curIPT := n.ipt4
|
|
newRules := []struct{ chain, rule string }{
|
|
{"filter/ts-input", fmt.Sprintf("! -i %s -s %s -j RETURN", tunname, tsaddr.ChromeOSVMRange().String())},
|
|
{"filter/ts-input", fmt.Sprintf("! -i %s -s %s -j DROP", tunname, tsaddr.CGNATRange().String())},
|
|
{"filter/ts-forward", fmt.Sprintf("-i %s -j MARK --set-mark %s/%s", tunname, linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)},
|
|
{"filter/ts-forward", fmt.Sprintf("-m mark --mark %s/%s -j ACCEPT", linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)},
|
|
{"filter/ts-forward", fmt.Sprintf("-o %s -s %s -j DROP", tunname, tsaddr.CGNATRange().String())},
|
|
{"filter/ts-forward", fmt.Sprintf("-o %s -j ACCEPT", tunname)},
|
|
}
|
|
for _, rule := range newRules {
|
|
if err := appendRule(n, curIPT, rule.chain, rule.rule); err != nil {
|
|
return fmt.Errorf("add rule %q to chain %q: %w", rule.rule, rule.chain, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) addBase6(tunname string) error {
|
|
curIPT := n.ipt6
|
|
newRules := []struct{ chain, rule string }{
|
|
{"filter/ts-forward", fmt.Sprintf("-i %s -j MARK --set-mark %s/%s", tunname, linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)},
|
|
{"filter/ts-forward", fmt.Sprintf("-m mark --mark %s/%s -j ACCEPT", linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)},
|
|
{"filter/ts-forward", fmt.Sprintf("-o %s -j ACCEPT", tunname)},
|
|
}
|
|
for _, rule := range newRules {
|
|
if err := appendRule(n, curIPT, rule.chain, rule.rule); err != nil {
|
|
return fmt.Errorf("add rule %q to chain %q: %w", rule.rule, rule.chain, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DelLoopbackRule(addr netip.Addr) error {
|
|
curIPT := n.ipt4
|
|
if addr.Is6() {
|
|
curIPT = n.ipt6
|
|
}
|
|
|
|
delRule := fmt.Sprintf("-i lo -s %s -j ACCEPT", addr.String())
|
|
|
|
return deleteRule(n, curIPT, "filter/ts-input", delRule)
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddHooks() error {
|
|
newRules := []struct{ chain, rule string }{
|
|
{"filter/INPUT", "-j ts-input"},
|
|
{"filter/FORWARD", "-j ts-forward"},
|
|
{"nat/POSTROUTING", "-j ts-postrouting"},
|
|
}
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
for _, r := range newRules {
|
|
if err := insertRule(n, ipt, r.chain, r.rule); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DelHooks(logf logger.Logf) error {
|
|
delRules := []struct{ chain, rule string }{
|
|
{"filter/INPUT", "-j ts-input"},
|
|
{"filter/FORWARD", "-j ts-forward"},
|
|
{"nat/POSTROUTING", "-j ts-postrouting"},
|
|
}
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
for _, r := range delRules {
|
|
if err := deleteRule(n, ipt, r.chain, r.rule); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddChains() error {
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
for _, chain := range []string{"filter/ts-input", "filter/ts-forward", "nat/ts-postrouting"} {
|
|
ipt[chain] = nil
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DelChains() error {
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
for chain := range ipt {
|
|
if strings.HasPrefix(chain, "filter/ts-") || strings.HasPrefix(chain, "nat/ts-") {
|
|
delete(ipt, chain)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DelBase() error {
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
for _, chain := range []string{"filter/ts-input", "filter/ts-forward", "nat/ts-postrouting"} {
|
|
ipt[chain] = nil
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) AddSNATRule() error {
|
|
newRule := fmt.Sprintf("-m mark --mark %s/%s -j MASQUERADE", linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
if err := appendRule(n, ipt, "nat/ts-postrouting", newRule); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) DelSNATRule() error {
|
|
delRule := fmt.Sprintf("-m mark --mark %s/%s -j MASQUERADE", linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)
|
|
for _, ipt := range []map[string][]string{n.ipt4, n.ipt6} {
|
|
if err := deleteRule(n, ipt, "nat/ts-postrouting", delRule); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeIPTablesRunner) HasIPV6() bool { return true }
|
|
func (n *fakeIPTablesRunner) HasIPV6NAT() bool { return true }
|
|
|
|
// fakeOS implements commandRunner and provides v4 and v6
|
|
// netfilterRunners, but captures changes without touching the OS.
|
|
type fakeOS struct {
|
|
t *testing.T
|
|
up bool
|
|
ips []string
|
|
routes []string
|
|
rules []string
|
|
//This test tests on the router level, so we will not bother
|
|
//with using iptables or nftables, chose the simpler one.
|
|
nfr linuxfw.NetfilterRunner
|
|
}
|
|
|
|
func NewFakeOS(t *testing.T) *fakeOS {
|
|
return &fakeOS{
|
|
t: t,
|
|
nfr: newIPTablesRunner(t),
|
|
}
|
|
}
|
|
|
|
var errExec = errors.New("execution failed")
|
|
|
|
func (o *fakeOS) String() string {
|
|
var b strings.Builder
|
|
if o.up {
|
|
b.WriteString("up\n")
|
|
} else {
|
|
b.WriteString("down\n")
|
|
}
|
|
|
|
for _, ip := range o.ips {
|
|
fmt.Fprintf(&b, "ip addr add %s\n", ip)
|
|
}
|
|
|
|
for _, route := range o.routes {
|
|
fmt.Fprintf(&b, "ip route add %s\n", route)
|
|
}
|
|
|
|
for _, rule := range o.rules {
|
|
fmt.Fprintf(&b, "ip rule add %s\n", rule)
|
|
}
|
|
|
|
var chains []string
|
|
for chain := range o.nfr.(*fakeIPTablesRunner).ipt4 {
|
|
chains = append(chains, chain)
|
|
}
|
|
sort.Strings(chains)
|
|
for _, chain := range chains {
|
|
for _, rule := range o.nfr.(*fakeIPTablesRunner).ipt4[chain] {
|
|
fmt.Fprintf(&b, "v4/%s %s\n", chain, rule)
|
|
}
|
|
}
|
|
|
|
chains = nil
|
|
for chain := range o.nfr.(*fakeIPTablesRunner).ipt6 {
|
|
chains = append(chains, chain)
|
|
}
|
|
sort.Strings(chains)
|
|
for _, chain := range chains {
|
|
for _, rule := range o.nfr.(*fakeIPTablesRunner).ipt6[chain] {
|
|
fmt.Fprintf(&b, "v6/%s %s\n", chain, rule)
|
|
}
|
|
}
|
|
|
|
return b.String()[:len(b.String())-1]
|
|
}
|
|
|
|
func (o *fakeOS) run(args ...string) error {
|
|
unexpected := func() error {
|
|
o.t.Errorf("unexpected invocation %q", strings.Join(args, " "))
|
|
return errors.New("unrecognized invocation")
|
|
}
|
|
if args[0] != "ip" {
|
|
return unexpected()
|
|
}
|
|
|
|
if len(args) == 2 && args[1] == "rule" {
|
|
// naked invocation of `ip rule` is a feature test. Return
|
|
// successfully.
|
|
return nil
|
|
}
|
|
|
|
family := ""
|
|
rest := strings.Join(args[3:], " ")
|
|
if args[1] == "-4" || args[1] == "-6" {
|
|
family = args[1]
|
|
copy(args[1:], args[2:])
|
|
args = args[:len(args)-1]
|
|
rest = family + " " + strings.Join(args[3:], " ")
|
|
}
|
|
|
|
var l *[]string
|
|
switch args[1] {
|
|
case "link":
|
|
got := strings.Join(args[2:], " ")
|
|
switch got {
|
|
case "set dev tailscale0 up":
|
|
o.up = true
|
|
case "set dev tailscale0 down":
|
|
o.up = false
|
|
default:
|
|
return unexpected()
|
|
}
|
|
return nil
|
|
case "addr":
|
|
l = &o.ips
|
|
case "route":
|
|
l = &o.routes
|
|
case "rule":
|
|
l = &o.rules
|
|
default:
|
|
return unexpected()
|
|
}
|
|
|
|
switch args[2] {
|
|
case "add":
|
|
for _, el := range *l {
|
|
if el == rest {
|
|
o.t.Errorf("can't add %q, already present", rest)
|
|
return errors.New("already exists")
|
|
}
|
|
}
|
|
*l = append(*l, rest)
|
|
sort.Strings(*l)
|
|
case "del":
|
|
found := false
|
|
for i, el := range *l {
|
|
if el == rest {
|
|
found = true
|
|
*l = append((*l)[:i], (*l)[i+1:]...)
|
|
break
|
|
}
|
|
}
|
|
if !found {
|
|
o.t.Logf("note: can't delete %q, not present", rest)
|
|
// 'ip rule del' exits with code 2 when a row is
|
|
// missing. We don't want to consider that an error,
|
|
// for cleanup purposes.
|
|
|
|
// TODO(apenwarr): this is a hack.
|
|
// I'd like to return an exec.ExitError(2) here, but
|
|
// I can't, because the ExitCode is implemented in
|
|
// os.ProcessState, which is an opaque object I can't
|
|
// instantiate or modify. Go's 75 levels of abstraction
|
|
// between me and an 8-bit int are really paying off
|
|
// here, as you can see.
|
|
return errors.New("exitcode:2")
|
|
}
|
|
default:
|
|
return unexpected()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (o *fakeOS) output(args ...string) ([]byte, error) {
|
|
want := "ip rule list priority 10000"
|
|
got := strings.Join(args, " ")
|
|
if got != want {
|
|
o.t.Errorf("unexpected command that wants output: %v", got)
|
|
return nil, errExec
|
|
}
|
|
|
|
var ret []string
|
|
for _, rule := range o.rules {
|
|
if strings.Contains(rule, "10000") {
|
|
ret = append(ret, rule)
|
|
}
|
|
}
|
|
return []byte(strings.Join(ret, "\n")), nil
|
|
}
|
|
|
|
var tunTestNum int64
|
|
|
|
func createTestTUN(t *testing.T) tun.Device {
|
|
const minimalMTU = 1280
|
|
tunName := fmt.Sprintf("tuntest%d", atomic.AddInt64(&tunTestNum, 1))
|
|
tun, err := tun.CreateTUN(tunName, minimalMTU)
|
|
if err != nil {
|
|
t.Fatalf("CreateTUN(%q): %v", tunName, err)
|
|
}
|
|
return tun
|
|
}
|
|
|
|
type linuxTest struct {
|
|
tun tun.Device
|
|
mon *netmon.Monitor
|
|
r *linuxRouter
|
|
logOutput tstest.MemLogger
|
|
}
|
|
|
|
func (lt *linuxTest) Close() error {
|
|
if lt.tun != nil {
|
|
lt.tun.Close()
|
|
}
|
|
if lt.mon != nil {
|
|
lt.mon.Close()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func newLinuxRootTest(t *testing.T) *linuxTest {
|
|
if os.Getuid() != 0 {
|
|
t.Skip("test requires root")
|
|
}
|
|
|
|
lt := new(linuxTest)
|
|
lt.tun = createTestTUN(t)
|
|
|
|
logf := lt.logOutput.Logf
|
|
|
|
mon, err := netmon.New(logger.Discard)
|
|
if err != nil {
|
|
lt.Close()
|
|
t.Fatal(err)
|
|
}
|
|
mon.Start()
|
|
lt.mon = mon
|
|
|
|
r, err := newUserspaceRouter(logf, lt.tun, mon)
|
|
if err != nil {
|
|
lt.Close()
|
|
t.Fatal(err)
|
|
}
|
|
lr := r.(*linuxRouter)
|
|
if err := lr.upInterface(); err != nil {
|
|
lt.Close()
|
|
t.Fatal(err)
|
|
}
|
|
lt.r = lr
|
|
return lt
|
|
}
|
|
|
|
func TestDelRouteIdempotent(t *testing.T) {
|
|
lt := newLinuxRootTest(t)
|
|
defer lt.Close()
|
|
|
|
for _, s := range []string{
|
|
"192.0.2.0/24", // RFC 5737
|
|
"2001:DB8::/32", // RFC 3849
|
|
} {
|
|
cidr := netip.MustParsePrefix(s)
|
|
if err := lt.r.addRoute(cidr); err != nil {
|
|
t.Error(err)
|
|
continue
|
|
}
|
|
for i := 0; i < 2; i++ {
|
|
if err := lt.r.delRoute(cidr); err != nil {
|
|
t.Errorf("delRoute(i=%d): %v", i, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
if t.Failed() {
|
|
out := lt.logOutput.String()
|
|
t.Logf("Log output:\n%s", out)
|
|
}
|
|
}
|
|
|
|
func TestAddRemoveRules(t *testing.T) {
|
|
lt := newLinuxRootTest(t)
|
|
defer lt.Close()
|
|
r := lt.r
|
|
|
|
step := func(name string, f func() error) {
|
|
t.Logf("Doing %v ...", name)
|
|
if err := f(); err != nil {
|
|
t.Fatalf("%s: %v", name, err)
|
|
}
|
|
rules, err := netlink.RuleList(netlink.FAMILY_ALL)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for _, r := range rules {
|
|
if r.Priority >= 5000 && r.Priority <= 5999 {
|
|
t.Logf("Rule: %+v", r)
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
step("init_del_and_add", r.addIPRules)
|
|
step("dup_add", r.justAddIPRules)
|
|
step("del", r.delIPRules)
|
|
step("dup_del", r.delIPRules)
|
|
|
|
}
|
|
|
|
func TestDebugListLinks(t *testing.T) {
|
|
links, err := netlink.LinkList()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for _, ln := range links {
|
|
t.Logf("Link: %+v", ln)
|
|
}
|
|
}
|
|
|
|
func TestDebugListRoutes(t *testing.T) {
|
|
// We need to pass a non-nil route to RouteListFiltered, along
|
|
// with the netlink.RT_FILTER_TABLE bit set in the filter
|
|
// mask, otherwise it ignores non-main routes.
|
|
filter := &netlink.Route{}
|
|
routes, err := netlink.RouteListFiltered(netlink.FAMILY_ALL, filter, netlink.RT_FILTER_TABLE)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for _, r := range routes {
|
|
t.Logf("Route: %+v", r)
|
|
}
|
|
}
|
|
|
|
var famName = map[int]string{
|
|
netlink.FAMILY_ALL: "all",
|
|
netlink.FAMILY_V4: "v4",
|
|
netlink.FAMILY_V6: "v6",
|
|
}
|
|
|
|
func TestDebugListRules(t *testing.T) {
|
|
for _, fam := range []int{netlink.FAMILY_V4, netlink.FAMILY_V6, netlink.FAMILY_ALL} {
|
|
t.Run(famName[fam], func(t *testing.T) {
|
|
rules, err := netlink.RuleList(fam)
|
|
if err != nil {
|
|
t.Skipf("skip; RuleList fails with: %v", err)
|
|
}
|
|
for _, r := range rules {
|
|
t.Logf("Rule: %+v", r)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestCheckIPRuleSupportsV6(t *testing.T) {
|
|
err := linuxfw.CheckIPRuleSupportsV6(t.Logf)
|
|
if err != nil && os.Getuid() != 0 {
|
|
t.Skipf("skipping, error when not root: %v", err)
|
|
}
|
|
// Just log it. For interactive testing only.
|
|
// Some machines running our tests might not have IPv6.
|
|
t.Logf("Got: %v", err)
|
|
}
|
|
|
|
func TestBusyboxParseVersion(t *testing.T) {
|
|
input := `BusyBox v1.34.1 (2022-09-01 16:10:29 UTC) multi-call binary.
|
|
BusyBox is copyrighted by many authors between 1998-2015.
|
|
Licensed under GPLv2. See source distribution for detailed
|
|
copyright notices.
|
|
|
|
Usage: busybox [function [arguments]...]
|
|
or: busybox --list[-full]
|
|
or: busybox --show SCRIPT
|
|
or: busybox --install [-s] [DIR]
|
|
or: function [arguments]...
|
|
|
|
BusyBox is a multi-call binary that combines many common Unix
|
|
utilities into a single executable. Most people will create a
|
|
link to busybox for each function they wish to use and BusyBox
|
|
will act like whatever it was invoked as.
|
|
`
|
|
|
|
v1, v2, v3, err := busyboxParseVersion(input)
|
|
if err != nil {
|
|
t.Fatalf("busyboxParseVersion() failed: %v", err)
|
|
}
|
|
|
|
if got, want := fmt.Sprintf("%d.%d.%d", v1, v2, v3), "1.34.1"; got != want {
|
|
t.Errorf("version = %q, want %q", got, want)
|
|
}
|
|
}
|
|
|
|
func TestCIDRDiff(t *testing.T) {
|
|
pfx := func(p ...string) []netip.Prefix {
|
|
var ret []netip.Prefix
|
|
for _, s := range p {
|
|
ret = append(ret, netip.MustParsePrefix(s))
|
|
}
|
|
return ret
|
|
}
|
|
tests := []struct {
|
|
old []netip.Prefix
|
|
new []netip.Prefix
|
|
wantAdd []netip.Prefix
|
|
wantDel []netip.Prefix
|
|
final []netip.Prefix
|
|
}{
|
|
{
|
|
old: nil,
|
|
new: pfx("1.1.1.1/32"),
|
|
wantAdd: pfx("1.1.1.1/32"),
|
|
final: pfx("1.1.1.1/32"),
|
|
},
|
|
{
|
|
old: pfx("1.1.1.1/32"),
|
|
new: pfx("1.1.1.1/32"),
|
|
final: pfx("1.1.1.1/32"),
|
|
},
|
|
{
|
|
old: pfx("1.1.1.1/32", "2.3.4.5/32"),
|
|
new: pfx("1.1.1.1/32"),
|
|
wantDel: pfx("2.3.4.5/32"),
|
|
final: pfx("1.1.1.1/32"),
|
|
},
|
|
{
|
|
old: pfx("1.1.1.1/32", "2.3.4.5/32"),
|
|
new: pfx("1.0.0.0/32", "3.4.5.6/32"),
|
|
wantDel: pfx("1.1.1.1/32", "2.3.4.5/32"),
|
|
wantAdd: pfx("1.0.0.0/32", "3.4.5.6/32"),
|
|
final: pfx("1.0.0.0/32", "3.4.5.6/32"),
|
|
},
|
|
}
|
|
for _, tc := range tests {
|
|
om := make(map[netip.Prefix]bool)
|
|
for _, p := range tc.old {
|
|
om[p] = true
|
|
}
|
|
var added []netip.Prefix
|
|
var deleted []netip.Prefix
|
|
fm, err := cidrDiff("test", om, tc.new, func(p netip.Prefix) error {
|
|
if len(deleted) > 0 {
|
|
t.Error("delete called before add")
|
|
}
|
|
added = append(added, p)
|
|
return nil
|
|
}, func(p netip.Prefix) error {
|
|
deleted = append(deleted, p)
|
|
return nil
|
|
}, t.Logf)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
slices.SortFunc(added, netipx.ComparePrefix)
|
|
slices.SortFunc(deleted, netipx.ComparePrefix)
|
|
if !reflect.DeepEqual(added, tc.wantAdd) {
|
|
t.Errorf("added = %v, want %v", added, tc.wantAdd)
|
|
}
|
|
if !reflect.DeepEqual(deleted, tc.wantDel) {
|
|
t.Errorf("deleted = %v, want %v", deleted, tc.wantDel)
|
|
}
|
|
|
|
// Check that the final state is correct.
|
|
if len(fm) != len(tc.final) {
|
|
t.Fatalf("final state = %v, want %v", fm, tc.final)
|
|
}
|
|
for _, p := range tc.final {
|
|
if !fm[p] {
|
|
t.Errorf("final state = %v, want %v", fm, tc.final)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var (
|
|
fwmaskSupported bool
|
|
fwmaskSupportedOnce sync.Once
|
|
fwmaskAdjustRe = regexp.MustCompile(`(?m)(fwmark 0x[0-9a-f]+)/0x[0-9a-f]+`)
|
|
)
|
|
|
|
// adjustFwmask removes the "/0xmask" string from fwmask stanzas if the
|
|
// installed 'ip' binary does not support that format.
|
|
func adjustFwmask(t *testing.T, s string) string {
|
|
t.Helper()
|
|
fwmaskSupportedOnce.Do(func() {
|
|
fwmaskSupported, _ = ipCmdSupportsFwmask()
|
|
})
|
|
if fwmaskSupported {
|
|
return s
|
|
}
|
|
|
|
return fwmaskAdjustRe.ReplaceAllString(s, "$1")
|
|
}
|