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This file was never truly necessary and has never actually been used in the history of Tailscale's open source releases. A Brief History of AUTHORS files --- The AUTHORS file was a pattern developed at Google, originally for Chromium, then adopted by Go and a bunch of other projects. The problem was that Chromium originally had a copyright line only recognizing Google as the copyright holder. Because Google (and most open source projects) do not require copyright assignemnt for contributions, each contributor maintains their copyright. Some large corporate contributors then tried to add their own name to the copyright line in the LICENSE file or in file headers. This quickly becomes unwieldy, and puts a tremendous burden on anyone building on top of Chromium, since the license requires that they keep all copyright lines intact. The compromise was to create an AUTHORS file that would list all of the copyright holders. The LICENSE file and source file headers would then include that list by reference, listing the copyright holder as "The Chromium Authors". This also become cumbersome to simply keep the file up to date with a high rate of new contributors. Plus it's not always obvious who the copyright holder is. Sometimes it is the individual making the contribution, but many times it may be their employer. There is no way for the proejct maintainer to know. Eventually, Google changed their policy to no longer recommend trying to keep the AUTHORS file up to date proactively, and instead to only add to it when requested: https://opensource.google/docs/releasing/authors. They are also clear that: > Adding contributors to the AUTHORS file is entirely within the > project's discretion and has no implications for copyright ownership. It was primarily added to appease a small number of large contributors that insisted that they be recognized as copyright holders (which was entirely their right to do). But it's not truly necessary, and not even the most accurate way of identifying contributors and/or copyright holders. In practice, we've never added anyone to our AUTHORS file. It only lists Tailscale, so it's not really serving any purpose. It also causes confusion because Tailscalars put the "Tailscale Inc & AUTHORS" header in other open source repos which don't actually have an AUTHORS file, so it's ambiguous what that means. Instead, we just acknowledge that the contributors to Tailscale (whoever they are) are copyright holders for their individual contributions. We also have the benefit of using the DCO (developercertificate.org) which provides some additional certification of their right to make the contribution. The source file changes were purely mechanical with: git ls-files | xargs sed -i -e 's/\(Tailscale Inc &\) AUTHORS/\1 contributors/g' Updates #cleanup Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d Signed-off-by: Will Norris <will@tailscale.com>
318 lines
11 KiB
Go
318 lines
11 KiB
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build linux
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package linuxfw
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import (
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"net/netip"
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"testing"
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"github.com/google/nftables"
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)
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// This test creates a temporary network namespace for the nftables rules being
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// set up, so it needs to run in a privileged mode. Locally it needs to be run
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// by root, else it will be silently skipped.
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// sudo go test -v -run Test_nftablesRunner_EnsurePortMapRuleForSvc ./util/linuxfw/...
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// In CI it runs in a privileged container.
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func Test_nftablesRunner_EnsurePortMapRuleForSvc(t *testing.T) {
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conn := newSysConn(t)
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runner := newFakeNftablesRunnerWithConn(t, conn, true)
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ipv4, ipv6 := netip.MustParseAddr("100.99.99.99"), netip.MustParseAddr("fd7a:115c:a1e0::701:b62a")
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pmTCP := PortMap{MatchPort: 4003, TargetPort: 80, Protocol: "TCP"}
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pmTCP1 := PortMap{MatchPort: 4004, TargetPort: 443, Protocol: "TCP"}
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// Create a rule for service 'svc:foo' to forward TCP traffic to IPv4 endpoint
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runner.EnsurePortMapRuleForSvc("svc:foo", "tailscale0", ipv4, pmTCP)
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svcChains(t, 1, conn)
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chainRuleCount(t, "svc:foo", 1, conn, nftables.TableFamilyIPv4)
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checkPortMapRule(t, "svc:foo", ipv4, pmTCP, runner, nftables.TableFamilyIPv4)
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// Create another rule for service 'svc:foo' to forward TCP traffic to the
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// same IPv4 endpoint, but to a different port.
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runner.EnsurePortMapRuleForSvc("svc:foo", "tailscale0", ipv4, pmTCP1)
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svcChains(t, 1, conn)
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chainRuleCount(t, "svc:foo", 2, conn, nftables.TableFamilyIPv4)
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checkPortMapRule(t, "svc:foo", ipv4, pmTCP1, runner, nftables.TableFamilyIPv4)
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// Create a rule for service 'svc:foo' to forward TCP traffic to an IPv6 endpoint
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runner.EnsurePortMapRuleForSvc("svc:foo", "tailscale0", ipv6, pmTCP)
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svcChains(t, 2, conn)
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chainRuleCount(t, "svc:foo", 1, conn, nftables.TableFamilyIPv6)
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checkPortMapRule(t, "svc:foo", ipv6, pmTCP, runner, nftables.TableFamilyIPv6)
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// Create a rule for service 'svc:bar' to forward TCP traffic to IPv4 endpoint
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runner.EnsurePortMapRuleForSvc("svc:bar", "tailscale0", ipv4, pmTCP)
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svcChains(t, 3, conn)
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chainRuleCount(t, "svc:bar", 1, conn, nftables.TableFamilyIPv4)
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checkPortMapRule(t, "svc:bar", ipv4, pmTCP, runner, nftables.TableFamilyIPv4)
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// Create a rule for service 'svc:bar' to forward TCP traffic to an IPv6 endpoint
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runner.EnsurePortMapRuleForSvc("svc:bar", "tailscale0", ipv6, pmTCP)
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svcChains(t, 4, conn)
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chainRuleCount(t, "svc:bar", 1, conn, nftables.TableFamilyIPv6)
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checkPortMapRule(t, "svc:bar", ipv6, pmTCP, runner, nftables.TableFamilyIPv6)
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// Delete service svc:bar
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runner.DeleteSvc("svc:bar", "tailscale0", []netip.Addr{ipv4, ipv6}, []PortMap{pmTCP})
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svcChains(t, 2, conn)
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// Delete a rule from service svc:foo
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runner.DeletePortMapRuleForSvc("svc:foo", "tailscale0", ipv4, pmTCP)
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svcChains(t, 2, conn)
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chainRuleCount(t, "svc:foo", 1, conn, nftables.TableFamilyIPv4)
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// Delete service svc:foo
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runner.DeleteSvc("svc:foo", "tailscale0", []netip.Addr{ipv4, ipv6}, []PortMap{pmTCP, pmTCP1})
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svcChains(t, 0, conn)
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}
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func Test_nftablesRunner_EnsureDNATRuleForSvc(t *testing.T) {
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conn := newSysConn(t)
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runner := newFakeNftablesRunnerWithConn(t, conn, true)
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// Test IPv4 DNAT rule
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ipv4OrigDst := netip.MustParseAddr("10.0.0.1")
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ipv4Target := netip.MustParseAddr("10.0.0.2")
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// Create DNAT rule for service 'svc:foo' to forward IPv4 traffic
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err := runner.EnsureDNATRuleForSvc("svc:foo", ipv4OrigDst, ipv4Target)
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if err != nil {
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t.Fatalf("error creating IPv4 DNAT rule: %v", err)
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}
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checkDNATRule(t, "svc:foo", ipv4OrigDst, ipv4Target, runner, nftables.TableFamilyIPv4)
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// Test IPv6 DNAT rule
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ipv6OrigDst := netip.MustParseAddr("fd7a:115c:a1e0::1")
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ipv6Target := netip.MustParseAddr("fd7a:115c:a1e0::2")
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// Create DNAT rule for service 'svc:foo' to forward IPv6 traffic
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err = runner.EnsureDNATRuleForSvc("svc:foo", ipv6OrigDst, ipv6Target)
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if err != nil {
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t.Fatalf("error creating IPv6 DNAT rule: %v", err)
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}
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checkDNATRule(t, "svc:foo", ipv6OrigDst, ipv6Target, runner, nftables.TableFamilyIPv6)
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// Test creating rule for another service
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err = runner.EnsureDNATRuleForSvc("svc:bar", ipv4OrigDst, ipv4Target)
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if err != nil {
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t.Fatalf("error creating DNAT rule for service 'svc:bar': %v", err)
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}
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checkDNATRule(t, "svc:bar", ipv4OrigDst, ipv4Target, runner, nftables.TableFamilyIPv4)
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}
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func Test_nftablesRunner_DeleteDNATRuleForSvc(t *testing.T) {
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conn := newSysConn(t)
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runner := newFakeNftablesRunnerWithConn(t, conn, true)
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// Test IPv4 DNAT rule deletion
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ipv4OrigDst := netip.MustParseAddr("10.0.0.1")
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ipv4Target := netip.MustParseAddr("10.0.0.2")
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// Create and then delete IPv4 DNAT rule
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err := runner.EnsureDNATRuleForSvc("svc:foo", ipv4OrigDst, ipv4Target)
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if err != nil {
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t.Fatalf("error creating IPv4 DNAT rule: %v", err)
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}
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// Verify rule exists before deletion
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table, err := runner.getNFTByAddr(ipv4OrigDst)
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if err != nil {
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t.Fatalf("error getting table: %v", err)
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}
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nftTable, err := getTableIfExists(runner.conn, table.Proto, "nat")
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if err != nil {
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t.Fatalf("error getting nat table: %v", err)
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}
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ch, err := getChainFromTable(runner.conn, nftTable, "PREROUTING")
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if err != nil {
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t.Fatalf("error getting PREROUTING chain: %v", err)
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}
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meta := svcRuleMeta("svc:foo", ipv4OrigDst, ipv4Target)
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rule, err := runner.findRuleByMetadata(nftTable, ch, meta)
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if err != nil {
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t.Fatalf("error checking if rule exists: %v", err)
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}
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if rule == nil {
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t.Fatal("rule does not exist before deletion")
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}
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err = runner.DeleteDNATRuleForSvc("svc:foo", ipv4OrigDst, ipv4Target)
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if err != nil {
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t.Fatalf("error deleting IPv4 DNAT rule: %v", err)
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}
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// Verify rule is deleted
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rule, err = runner.findRuleByMetadata(nftTable, ch, meta)
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if err != nil {
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t.Fatalf("error checking if rule exists: %v", err)
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}
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if rule != nil {
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t.Fatal("rule still exists after deletion")
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}
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// Test IPv6 DNAT rule deletion
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ipv6OrigDst := netip.MustParseAddr("fd7a:115c:a1e0::1")
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ipv6Target := netip.MustParseAddr("fd7a:115c:a1e0::2")
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// Create and then delete IPv6 DNAT rule
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err = runner.EnsureDNATRuleForSvc("svc:foo", ipv6OrigDst, ipv6Target)
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if err != nil {
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t.Fatalf("error creating IPv6 DNAT rule: %v", err)
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}
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// Verify rule exists before deletion
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table, err = runner.getNFTByAddr(ipv6OrigDst)
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if err != nil {
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t.Fatalf("error getting table: %v", err)
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}
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nftTable, err = getTableIfExists(runner.conn, table.Proto, "nat")
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if err != nil {
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t.Fatalf("error getting nat table: %v", err)
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}
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ch, err = getChainFromTable(runner.conn, nftTable, "PREROUTING")
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if err != nil {
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t.Fatalf("error getting PREROUTING chain: %v", err)
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}
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meta = svcRuleMeta("svc:foo", ipv6OrigDst, ipv6Target)
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rule, err = runner.findRuleByMetadata(nftTable, ch, meta)
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if err != nil {
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t.Fatalf("error checking if rule exists: %v", err)
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}
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if rule == nil {
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t.Fatal("rule does not exist before deletion")
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}
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err = runner.DeleteDNATRuleForSvc("svc:foo", ipv6OrigDst, ipv6Target)
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if err != nil {
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t.Fatalf("error deleting IPv6 DNAT rule: %v", err)
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}
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// Verify rule is deleted
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rule, err = runner.findRuleByMetadata(nftTable, ch, meta)
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if err != nil {
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t.Fatalf("error checking if rule exists: %v", err)
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}
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if rule != nil {
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t.Fatal("rule still exists after deletion")
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}
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}
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// checkDNATRule verifies that a DNAT rule exists for the given service, original destination, and target IP.
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func checkDNATRule(t *testing.T, svc string, origDst, targetIP netip.Addr, runner *nftablesRunner, fam nftables.TableFamily) {
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t.Helper()
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table, err := runner.getNFTByAddr(origDst)
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if err != nil {
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t.Fatalf("error getting table: %v", err)
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}
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nftTable, err := getTableIfExists(runner.conn, table.Proto, "nat")
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if err != nil {
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t.Fatalf("error getting nat table: %v", err)
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}
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if nftTable == nil {
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t.Fatal("nat table not found")
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}
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ch, err := getChainFromTable(runner.conn, nftTable, "PREROUTING")
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if err != nil {
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t.Fatalf("error getting PREROUTING chain: %v", err)
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}
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if ch == nil {
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t.Fatal("PREROUTING chain not found")
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}
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meta := svcRuleMeta(svc, origDst, targetIP)
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rule, err := runner.findRuleByMetadata(nftTable, ch, meta)
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if err != nil {
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t.Fatalf("error checking if rule exists: %v", err)
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}
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if rule == nil {
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t.Fatal("DNAT rule not found")
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}
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}
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// svcChains verifies that the expected number of chains exist (for either IP
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// family) and that each of them is configured as NAT prerouting chain.
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func svcChains(t *testing.T, wantCount int, conn *nftables.Conn) {
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t.Helper()
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chains, err := conn.ListChains()
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if err != nil {
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t.Fatalf("error listing chains: %v", err)
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}
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if len(chains) != wantCount {
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t.Fatalf("wants %d chains, got %d", wantCount, len(chains))
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}
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for _, ch := range chains {
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if *ch.Policy != nftables.ChainPolicyAccept {
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t.Fatalf("chain %s has unexpected policy %v", ch.Name, *ch.Policy)
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}
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if ch.Type != nftables.ChainTypeNAT {
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t.Fatalf("chain %s has unexpected type %v", ch.Name, ch.Type)
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}
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if *ch.Hooknum != *nftables.ChainHookPrerouting {
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t.Fatalf("chain %s is attached to unexpected hook %v", ch.Name, ch.Hooknum)
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}
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if *ch.Priority != *nftables.ChainPriorityNATDest {
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t.Fatalf("chain %s has unexpected priority %v", ch.Name, ch.Priority)
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}
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}
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}
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// chainRuleCount verifies that the named chain in the given table contains the provided number of rules.
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func chainRuleCount(t *testing.T, name string, numOfRules int, conn *nftables.Conn, fam nftables.TableFamily) {
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t.Helper()
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chains, err := conn.ListChainsOfTableFamily(fam)
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if err != nil {
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t.Fatalf("error listing chains: %v", err)
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}
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for _, ch := range chains {
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if ch.Name == name {
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checkChainRules(t, conn, ch, numOfRules)
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return
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}
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}
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t.Fatalf("chain %s does not exist", name)
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}
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// checkPortMapRule verifies that rule for the provided target IP and PortMap exists in a chain identified by service
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// name and IP family.
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func checkPortMapRule(t *testing.T, svc string, targetIP netip.Addr, pm PortMap, runner *nftablesRunner, fam nftables.TableFamily) {
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t.Helper()
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chains, err := runner.conn.ListChainsOfTableFamily(fam)
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if err != nil {
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t.Fatalf("error listing chains: %v", err)
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}
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var chain *nftables.Chain
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for _, ch := range chains {
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if ch.Name == svc {
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chain = ch
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break
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}
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}
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if chain == nil {
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t.Fatalf("chain for service %s does not exist", svc)
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}
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meta := svcPortMapRuleMeta(svc, targetIP, pm)
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p, err := protoFromString(pm.Protocol)
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if err != nil {
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t.Fatalf("error converting protocol: %v", err)
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}
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wantsRule := portMapRule(chain.Table, chain, "tailscale0", targetIP, pm.MatchPort, pm.TargetPort, p, meta)
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checkRule(t, wantsRule, runner.conn)
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}
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// checkRule checks that the provided rules exists.
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func checkRule(t *testing.T, rule *nftables.Rule, conn *nftables.Conn) {
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t.Helper()
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gotRule, err := findRule(conn, rule)
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if err != nil {
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t.Fatalf("error looking up rule: %v", err)
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}
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if gotRule == nil {
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t.Fatal("rule not found")
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}
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}
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