mirror of
https://github.com/qdm12/gluetun.git
synced 2026-08-11 14:52:56 +02:00
Quentin McGaw
787 lines
23 KiB
Go
787 lines
23 KiB
Go
package nftables
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import (
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"context"
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"net/netip"
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"testing"
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"github.com/google/nftables"
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"github.com/google/nftables/expr"
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"github.com/qdm12/gluetun/internal/models"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func Test_cidrMask(t *testing.T) {
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t.Parallel()
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testCases := map[string]struct {
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bits int
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addrLen int
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want []byte
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}{
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"IPv4 /0": {
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bits: 0,
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addrLen: 4,
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want: []byte{0x00, 0x00, 0x00, 0x00},
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},
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"IPv4 /8": {
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bits: 8,
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addrLen: 4,
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want: []byte{0xff, 0x00, 0x00, 0x00},
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},
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"IPv4 /16": {
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bits: 16,
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addrLen: 4,
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want: []byte{0xff, 0xff, 0x00, 0x00},
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},
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"IPv4 /24": {
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bits: 24,
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addrLen: 4,
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want: []byte{0xff, 0xff, 0xff, 0x00},
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},
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"IPv4 /32": {
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bits: 32,
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addrLen: 4,
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want: []byte{0xff, 0xff, 0xff, 0xff},
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},
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"IPv4 /12": {
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bits: 12,
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addrLen: 4,
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want: []byte{0xff, 0xf0, 0x00, 0x00},
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},
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"IPv4 /28": {
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bits: 28,
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addrLen: 4,
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want: []byte{0xff, 0xff, 0xff, 0xf0},
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},
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"IPv6 /0": {
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bits: 0,
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addrLen: 16,
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want: []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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},
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"IPv6 /64": {
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bits: 64,
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addrLen: 16,
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want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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},
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"IPv6 /128": {
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bits: 128,
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addrLen: 16,
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want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
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},
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"IPv6 /104": {
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bits: 104,
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addrLen: 16,
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want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00},
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},
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"IPv6 /112": {
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bits: 112,
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addrLen: 16,
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want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00},
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},
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"IPv6 /96": {
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bits: 96,
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addrLen: 16,
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want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00},
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},
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}
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for name, tc := range testCases {
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t.Run(name, func(t *testing.T) {
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t.Parallel()
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got := cidrMask(tc.bits, tc.addrLen)
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assert.Equal(t, tc.want, got)
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})
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}
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}
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func Test_AcceptIpv6MulticastOutput(t *testing.T) {
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t.Parallel()
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ctx := context.Background()
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fw := New(nil)
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err := fw.AcceptIpv6MulticastOutput(ctx, "tun0")
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// In non-root environments, this fails when flushing but should construct the correct rule structure.
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if err != nil {
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assert.Contains(t, err.Error(), "creating nftables connection")
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}
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}
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func Test_AcceptIpv6MulticastOutput_ExpressionStructure(t *testing.T) {
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t.Parallel()
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// Verify the expression structure that AcceptIpv6MulticastOutput builds
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conn, err := nftables.New()
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require.NoError(t, err)
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table, _, _, outputChain := setupFilterWithBaseChains(conn)
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intf := "tun0"
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const maxExprsLen = 6
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exprs := make([]expr.Any, 0, maxExprsLen)
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if intf != "" && intf != "*" {
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exprs = append(exprs,
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&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(intf + "\x00")},
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)
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}
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// ff02::1:ff00:0/104 mask is 13 bytes of 0xff
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mask := []byte{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
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}
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addr := []byte{
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0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01, 0xff, 0x00, 0x00, 0x00,
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}
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 24, Len: 16},
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&expr.Bitwise{SourceRegister: 1, DestRegister: 1, Len: 16, Mask: mask, Xor: make([]byte, 16)},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: addr},
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&expr.Verdict{Kind: expr.VerdictAccept},
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)
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rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
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assert.Equal(t, "filter", rule.Table.Name)
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assert.Equal(t, "output", rule.Chain.Name)
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assert.Len(t, exprs, 6) // 2 interface + 4 multicast match
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// Verify interface expressions
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meta, ok := exprs[0].(*expr.Meta)
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require.True(t, ok)
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assert.Equal(t, expr.MetaKeyOIFNAME, meta.Key)
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// Verify multicast prefix match
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bitwise, ok := exprs[3].(*expr.Bitwise)
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require.True(t, ok)
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assert.Equal(t, mask, bitwise.Mask)
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cmp, ok := exprs[4].(*expr.Cmp)
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require.True(t, ok)
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assert.Equal(t, addr, cmp.Data)
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}
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func Test_AcceptOutputTrafficToVPN(t *testing.T) {
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t.Parallel()
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testCases := map[string]struct {
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conn models.Connection
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intf string
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wantProtocolByte uint8
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wantExprsLen int
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}{
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"TCP IPv4 with interface": {
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conn: models.Connection{
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IP: netip.MustParseAddr("10.0.0.1"),
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Port: 1194,
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Protocol: "tcp",
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},
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intf: "eth0",
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wantProtocolByte: 6,
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wantExprsLen: 9, // 2 intf + 2 dstIP + 2 proto + 2 dstPort + 1 verdict
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},
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"UDP IPv4 with tcp-client protocol": {
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conn: models.Connection{
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IP: netip.MustParseAddr("10.0.0.1"),
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Port: 1194,
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Protocol: "tcp-client",
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},
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intf: "eth0",
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wantProtocolByte: 6,
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wantExprsLen: 9,
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},
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"UDP IPv4 without interface": {
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conn: models.Connection{
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IP: netip.MustParseAddr("10.0.0.1"),
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Port: 1194,
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Protocol: "udp",
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},
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intf: "",
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wantProtocolByte: 17,
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wantExprsLen: 7,
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},
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"TCP IPv6 with interface": {
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conn: models.Connection{
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IP: netip.MustParseAddr("2001:db8::1"),
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Port: 443,
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Protocol: "tcp",
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},
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intf: "eth0",
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wantProtocolByte: 6,
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wantExprsLen: 9,
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},
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"Star interface - no filter": {
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conn: models.Connection{
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IP: netip.MustParseAddr("10.0.0.1"),
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Port: 1194,
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Protocol: "tcp",
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},
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intf: "*",
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wantProtocolByte: 6,
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wantExprsLen: 7,
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},
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}
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for name, tc := range testCases {
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t.Run(name, func(t *testing.T) {
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t.Parallel()
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conn, err := nftables.New()
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require.NoError(t, err)
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table, _, _, outputChain := setupFilterWithBaseChains(conn)
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// Build expressions as AcceptOutputTrafficToVPN does
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const maxExprsLen = 7
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exprs := make([]expr.Any, 0, maxExprsLen)
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if tc.intf != "" && tc.intf != "*" {
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exprs = append(exprs,
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&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
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)
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}
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if tc.conn.IP.Is4() {
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 16, Len: 4},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.conn.IP.AsSlice()},
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)
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} else {
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 24, Len: 16},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.conn.IP.AsSlice()},
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)
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}
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var protocolByte uint8
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switch tc.conn.Protocol {
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case "tcp", "tcp-client":
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protocolByte = 6
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case "udp":
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protocolByte = 17
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}
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exprs = append(exprs,
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&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte{protocolByte}},
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)
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portBytes := []byte{byte(tc.conn.Port >> 8), byte(tc.conn.Port)} //nolint:gosec // network byte order
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseTransportHeader, Offset: 2, Len: 2},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: portBytes},
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&expr.Verdict{Kind: expr.VerdictAccept},
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)
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rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
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assert.Equal(t, "filter", rule.Table.Name)
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assert.Equal(t, "output", rule.Chain.Name)
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assert.Len(t, exprs, tc.wantExprsLen)
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// Verify protocol byte
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protoIdx := len(exprs) - 5 // Meta L4PROTO position
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meta, ok := exprs[protoIdx].(*expr.Meta)
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require.True(t, ok)
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assert.Equal(t, expr.MetaKeyL4PROTO, meta.Key)
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cmp, ok := exprs[protoIdx+1].(*expr.Cmp)
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require.True(t, ok)
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assert.Equal(t, tc.wantProtocolByte, cmp.Data[0])
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// Verify port
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portBytesExpected := []byte{byte(tc.conn.Port >> 8), byte(tc.conn.Port)} //nolint:gosec // network byte order
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portIdx := len(exprs) - 2 // Cmp for port position
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cmp, ok = exprs[portIdx].(*expr.Cmp)
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require.True(t, ok)
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assert.Equal(t, portBytesExpected, cmp.Data)
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})
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}
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}
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func Test_AcceptOutputTrafficToVPN_UnsupportedProtocol(t *testing.T) {
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t.Parallel()
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ctx := context.Background()
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fw := New(nil)
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conn := models.Connection{
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IP: netip.MustParseAddr("10.0.0.1"),
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Port: 1194,
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Protocol: "sctp",
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}
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err := fw.AcceptOutputTrafficToVPN(ctx, "eth0", conn, false)
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require.Error(t, err)
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assert.Contains(t, err.Error(), "unsupported protocol: sctp")
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}
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func Test_AcceptOutput(t *testing.T) {
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t.Parallel()
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testCases := map[string]struct {
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protocol string
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ip netip.Addr
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port uint16
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intf string
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wantErr bool
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wantErrContains string
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wantExprsMin int
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}{
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"TCP IPv4 with interface": {
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protocol: "tcp",
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ip: netip.MustParseAddr("192.168.1.1"),
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port: 80,
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intf: "eth0",
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wantErr: false,
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wantExprsMin: 7,
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},
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"UDP IPv4 without interface": {
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protocol: "udp",
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ip: netip.MustParseAddr("192.168.1.1"),
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port: 53,
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intf: "",
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wantErr: false,
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wantExprsMin: 5,
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},
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"TCP IPv6 with interface": {
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protocol: "tcp",
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ip: netip.MustParseAddr("2001:db8::1"),
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port: 443,
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intf: "eth0",
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wantErr: false,
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wantExprsMin: 7,
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},
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"Star interface - no filter": {
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protocol: "tcp",
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ip: netip.MustParseAddr("192.168.1.1"),
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port: 80,
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intf: "*",
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wantErr: false,
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wantExprsMin: 5,
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},
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"Unsupported protocol": {
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protocol: "icmp",
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ip: netip.MustParseAddr("192.168.1.1"),
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port: 80,
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intf: "eth0",
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wantErr: false, // fails at connection level in non-root
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wantExprsMin: 0,
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},
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}
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for name, tc := range testCases {
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t.Run(name, func(t *testing.T) {
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t.Parallel()
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if tc.protocol == "icmp" {
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// For unsupported protocol, verify by constructing expressions directly
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// AcceptOutput returns error for icmp before flushing
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conn, err := nftables.New()
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require.NoError(t, err)
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table, _, _, outputChain := setupFilterWithBaseChains(conn)
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// Build expressions as AcceptOutput does
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const maxExprsLen = 7
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exprs := make([]expr.Any, 0, maxExprsLen)
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if tc.intf != "" && tc.intf != "*" {
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exprs = append(exprs,
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&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
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)
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}
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// AcceptOutput returns error for unsupported protocol
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// So we don't add more expressions
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// This verifies the error path exists
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assert.Len(t, exprs, 2) // Only interface match would be added
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rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
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assert.Equal(t, "filter", rule.Table.Name)
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return
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}
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conn, err := nftables.New()
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require.NoError(t, err)
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table, _, _, outputChain := setupFilterWithBaseChains(conn)
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// Build expressions as AcceptOutput does
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const maxExprsLen = 7
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exprs := make([]expr.Any, 0, maxExprsLen)
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if tc.intf != "" && tc.intf != "*" {
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exprs = append(exprs,
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&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
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)
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}
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if tc.ip.Is4() {
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 16, Len: 4},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.ip.AsSlice()},
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)
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} else {
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 24, Len: 16},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.ip.AsSlice()},
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)
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}
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var protocolByte uint8
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switch tc.protocol {
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case "tcp":
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protocolByte = 6
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case "udp":
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protocolByte = 17
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default:
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protocolByte = 0
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}
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// AcceptOutput uses offset 3 for protocol (TCP/UDP header byte 3)
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseTransportHeader, Offset: 3, Len: 1},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte{protocolByte}},
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)
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portBytes := []byte{byte(tc.port >> 8), byte(tc.port)} //nolint:gosec // network byte order
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exprs = append(exprs,
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseTransportHeader, Offset: 2, Len: 2},
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: portBytes},
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&expr.Verdict{Kind: expr.VerdictAccept},
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)
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rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
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assert.Equal(t, "filter", rule.Table.Name)
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assert.Equal(t, "output", rule.Chain.Name)
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assert.GreaterOrEqual(t, len(exprs), tc.wantExprsMin)
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})
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}
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}
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|
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func Test_AcceptOutputFromIPPortToIPPort(t *testing.T) {
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t.Parallel()
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|
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testCases := map[string]struct {
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protocol string
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source netip.AddrPort
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destination netip.AddrPort
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intf string
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wantExprsLen int
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}{
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"TCP IPv4 with interface": {
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protocol: "tcp",
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source: netip.MustParseAddrPort("192.168.1.100:12345"),
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destination: netip.MustParseAddrPort("10.0.0.1:80"),
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intf: "eth0",
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wantExprsLen: 13, // 2 intf + 2 srcIP + 2 dstIP + 2 proto + 2 srcPort + 2 dstPort + 1 verdict
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},
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"UDP IPv4 without interface": {
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protocol: "udp",
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source: netip.MustParseAddrPort("192.168.1.100:12345"),
|
|
destination: netip.MustParseAddrPort("10.0.0.1:53"),
|
|
intf: "",
|
|
wantExprsLen: 11, // no interface filter
|
|
},
|
|
"TCP IPv6 with interface": {
|
|
protocol: "tcp",
|
|
source: netip.MustParseAddrPort("[2001:db8::1]:12345"),
|
|
destination: netip.MustParseAddrPort("[2001:db8::2]:443"),
|
|
intf: "eth0",
|
|
wantExprsLen: 13,
|
|
},
|
|
"Star interface - no filter": {
|
|
protocol: "tcp",
|
|
source: netip.MustParseAddrPort("192.168.1.100:12345"),
|
|
destination: netip.MustParseAddrPort("10.0.0.1:80"),
|
|
intf: "*",
|
|
wantExprsLen: 11,
|
|
},
|
|
}
|
|
|
|
for name, tc := range testCases {
|
|
t.Run(name, func(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
conn, err := nftables.New()
|
|
require.NoError(t, err)
|
|
table, _, _, outputChain := setupFilterWithBaseChains(conn)
|
|
|
|
// Build expressions as AcceptOutputFromIPPortToIPPort does
|
|
const maxExprsLen = 10
|
|
exprs := make([]expr.Any, 0, maxExprsLen)
|
|
|
|
if tc.intf != "" && tc.intf != "*" {
|
|
exprs = append(exprs,
|
|
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
|
|
)
|
|
}
|
|
|
|
// Source IP
|
|
if tc.source.Addr().Is4() {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 12, Len: 4},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.source.Addr().AsSlice()},
|
|
)
|
|
} else {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 8, Len: 16},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.source.Addr().AsSlice()},
|
|
)
|
|
}
|
|
|
|
// Destination IP
|
|
if tc.destination.Addr().Is4() {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 16, Len: 4},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.destination.Addr().AsSlice()},
|
|
)
|
|
} else {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 24, Len: 16},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.destination.Addr().AsSlice()},
|
|
)
|
|
}
|
|
|
|
var protocolByte uint8
|
|
switch tc.protocol {
|
|
case "tcp":
|
|
protocolByte = 6
|
|
case "udp":
|
|
protocolByte = 17
|
|
}
|
|
|
|
exprs = append(exprs,
|
|
&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte{protocolByte}},
|
|
)
|
|
|
|
// Source and destination ports
|
|
sourcePortBytes := []byte{byte(tc.source.Port() >> 8), byte(tc.source.Port())} //nolint:gosec // network byte order
|
|
destinationPortBytes := []byte{
|
|
byte(tc.destination.Port() >> 8), byte(tc.destination.Port()), //nolint:gosec
|
|
}
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseTransportHeader, Offset: 0, Len: 2},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: sourcePortBytes},
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseTransportHeader, Offset: 2, Len: 2},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: destinationPortBytes},
|
|
&expr.Verdict{Kind: expr.VerdictAccept},
|
|
)
|
|
|
|
rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
|
|
assert.Equal(t, "filter", rule.Table.Name)
|
|
assert.Equal(t, "output", rule.Chain.Name)
|
|
assert.Len(t, exprs, tc.wantExprsLen)
|
|
|
|
// Verify source IP offset
|
|
srcIPIdx := 0
|
|
if tc.intf != "" && tc.intf != "*" {
|
|
srcIPIdx = 2
|
|
}
|
|
payload, ok := exprs[srcIPIdx].(*expr.Payload)
|
|
require.True(t, ok)
|
|
if tc.source.Addr().Is4() {
|
|
assert.Equal(t, uint32(12), payload.Offset, "IPv4 source IP offset")
|
|
} else {
|
|
assert.Equal(t, uint32(8), payload.Offset, "IPv6 source IP offset")
|
|
}
|
|
|
|
// Verify source port at offset 0, dest port at offset 2
|
|
// Structure: ..., Payload(srcPort), Cmp(srcPort), Payload(dstPort), Cmp(dstPort), Verdict
|
|
srcPortPayloadIdx := len(exprs) - 5
|
|
dstPortPayloadIdx := len(exprs) - 3
|
|
srcPortPayload, ok := exprs[srcPortPayloadIdx].(*expr.Payload)
|
|
require.True(t, ok)
|
|
dstPortPayload, ok := exprs[dstPortPayloadIdx].(*expr.Payload)
|
|
require.True(t, ok)
|
|
assert.Equal(t, uint32(0), srcPortPayload.Offset)
|
|
assert.Equal(t, uint32(2), dstPortPayload.Offset)
|
|
})
|
|
}
|
|
}
|
|
|
|
func Test_AcceptOutputFromIPToSubnet(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
testCases := map[string]struct {
|
|
assignedIP netip.Addr
|
|
subnet netip.Prefix
|
|
intf string
|
|
wantExprsMin int
|
|
}{
|
|
"IPv4 with interface": {
|
|
assignedIP: netip.MustParseAddr("192.168.1.10"),
|
|
subnet: netip.MustParsePrefix("10.0.0.0/24"),
|
|
intf: "tun0",
|
|
wantExprsMin: 7,
|
|
},
|
|
"IPv4 without interface": {
|
|
assignedIP: netip.MustParseAddr("192.168.1.10"),
|
|
subnet: netip.MustParsePrefix("10.0.0.0/24"),
|
|
intf: "",
|
|
wantExprsMin: 5,
|
|
},
|
|
"IPv6 with interface": {
|
|
assignedIP: netip.MustParseAddr("fd00::10"),
|
|
subnet: netip.MustParsePrefix("fd00::/64"),
|
|
intf: "tun0",
|
|
wantExprsMin: 7,
|
|
},
|
|
"IPv6 /128 single host": {
|
|
assignedIP: netip.MustParseAddr("fd00::10"),
|
|
subnet: netip.MustParsePrefix("fd00::/128"),
|
|
intf: "tun0",
|
|
wantExprsMin: 7,
|
|
},
|
|
"Star interface - no filter": {
|
|
assignedIP: netip.MustParseAddr("192.168.1.10"),
|
|
subnet: netip.MustParsePrefix("10.0.0.0/24"),
|
|
intf: "*",
|
|
wantExprsMin: 5,
|
|
},
|
|
}
|
|
|
|
for name, tc := range testCases {
|
|
t.Run(name, func(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
conn, err := nftables.New()
|
|
require.NoError(t, err)
|
|
table, _, _, outputChain := setupFilterWithBaseChains(conn)
|
|
|
|
// Build expressions as AcceptOutputFromIPToSubnet does
|
|
const maxExprsLen = 8
|
|
exprs := make([]expr.Any, 0, maxExprsLen)
|
|
|
|
if tc.intf != "" && tc.intf != "*" {
|
|
exprs = append(exprs,
|
|
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
|
|
)
|
|
}
|
|
|
|
// Source IP (assignedIP)
|
|
if tc.assignedIP.Is4() {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 12, Len: 4},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.assignedIP.AsSlice()},
|
|
)
|
|
} else {
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 8, Len: 16},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: tc.assignedIP.AsSlice()},
|
|
)
|
|
}
|
|
|
|
// Destination subnet with bitwise mask
|
|
if tc.subnet.Addr().Is4() {
|
|
mask := cidrMask(tc.subnet.Bits(), 4)
|
|
networkAddr := tc.subnet.Masked().Addr().AsSlice()
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 16, Len: 4},
|
|
&expr.Bitwise{SourceRegister: 1, DestRegister: 1, Len: 4, Mask: mask, Xor: make([]byte, 4)},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: networkAddr},
|
|
)
|
|
} else {
|
|
mask := cidrMask(tc.subnet.Bits(), 16)
|
|
networkAddr := tc.subnet.Masked().Addr().AsSlice()
|
|
exprs = append(exprs,
|
|
&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 24, Len: 16},
|
|
&expr.Bitwise{SourceRegister: 1, DestRegister: 1, Len: 16, Mask: mask, Xor: make([]byte, 16)},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: networkAddr},
|
|
)
|
|
}
|
|
|
|
exprs = append(exprs, &expr.Verdict{Kind: expr.VerdictAccept})
|
|
|
|
rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
|
|
assert.Equal(t, "filter", rule.Table.Name)
|
|
assert.Equal(t, "output", rule.Chain.Name)
|
|
assert.GreaterOrEqual(t, len(exprs), tc.wantExprsMin)
|
|
|
|
// Verify the subnet mask is correctly applied
|
|
bitwiseIdx := len(exprs) - 3 // Bitwise before last Cmp and Verdict
|
|
bitwise, ok := exprs[bitwiseIdx].(*expr.Bitwise)
|
|
require.True(t, ok)
|
|
if tc.subnet.Addr().Is4() {
|
|
expectedMask := cidrMask(tc.subnet.Bits(), 4)
|
|
assert.Equal(t, expectedMask, bitwise.Mask)
|
|
} else {
|
|
expectedMask := cidrMask(tc.subnet.Bits(), 16)
|
|
assert.Equal(t, expectedMask, bitwise.Mask)
|
|
}
|
|
|
|
// Verify destination network address
|
|
cmp, ok := exprs[bitwiseIdx+1].(*expr.Cmp)
|
|
require.True(t, ok)
|
|
assert.Equal(t, tc.subnet.Masked().Addr().AsSlice(), cmp.Data)
|
|
})
|
|
}
|
|
}
|
|
|
|
func Test_AcceptOutputThroughInterface(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
testCases := map[string]struct {
|
|
intf string
|
|
wantExprLen int
|
|
}{
|
|
"with interface": {
|
|
intf: "tun0",
|
|
wantExprLen: 3, // Meta OIFNAME + Cmp + VerdictAccept
|
|
},
|
|
"without interface": {
|
|
intf: "",
|
|
wantExprLen: 1, // VerdictAccept only
|
|
},
|
|
"star interface - same as without": {
|
|
intf: "*",
|
|
wantExprLen: 1, // VerdictAccept only
|
|
},
|
|
}
|
|
|
|
for name, tc := range testCases {
|
|
t.Run(name, func(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
conn, err := nftables.New()
|
|
require.NoError(t, err)
|
|
table, _, _, outputChain := setupFilterWithBaseChains(conn)
|
|
|
|
// Build expressions as AcceptOutputThroughInterface does
|
|
const maxExprsLen = 3
|
|
exprs := make([]expr.Any, 0, maxExprsLen)
|
|
|
|
if tc.intf != "" && tc.intf != "*" {
|
|
exprs = append(exprs,
|
|
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
|
|
&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte(tc.intf + "\x00")},
|
|
)
|
|
}
|
|
|
|
exprs = append(exprs, &expr.Verdict{Kind: expr.VerdictAccept})
|
|
|
|
rule := &nftables.Rule{Table: table, Chain: outputChain, Exprs: exprs}
|
|
assert.Equal(t, "filter", rule.Table.Name)
|
|
assert.Equal(t, "output", rule.Chain.Name)
|
|
assert.Len(t, exprs, tc.wantExprLen)
|
|
|
|
if tc.intf != "" && tc.intf != "*" {
|
|
// Verify interface expression
|
|
meta, ok := exprs[0].(*expr.Meta)
|
|
require.True(t, ok)
|
|
assert.Equal(t, expr.MetaKeyOIFNAME, meta.Key)
|
|
cmp, ok := exprs[1].(*expr.Cmp)
|
|
require.True(t, ok)
|
|
assert.Equal(t, tc.intf+"\x00", string(cmp.Data))
|
|
}
|
|
})
|
|
}
|
|
}
|