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addrselect_test.go
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
package net
import (
"net/netip"
"reflect"
"testing"
)
func TestSortByRFC6724(t *testing.T) {
tests := []struct {
in []IPAddr
srcs []netip.Addr
want []IPAddr
reverse bool // also test it starting backwards
}{
// Examples from RFC 6724 section 10.2:
// Prefer matching scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
srcs: []netip.Addr{
netip.MustParseAddr("2001:db8:1::2"),
netip.MustParseAddr("169.254.13.78"),
},
want: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
reverse: true,
},
// Prefer matching scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
srcs: []netip.Addr{
netip.MustParseAddr("fe80::1"),
netip.MustParseAddr("198.51.100.117"),
},
want: []IPAddr{
{IP: ParseIP("198.51.100.121")},
{IP: ParseIP("2001:db8:1::1")},
},
reverse: true,
},
// Prefer higher precedence.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("10.1.2.3")},
},
srcs: []netip.Addr{
netip.MustParseAddr("2001:db8:1::2"),
netip.MustParseAddr("10.1.2.4"),
},
want: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("10.1.2.3")},
},
reverse: true,
},
// Prefer smaller scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("fe80::1")},
},
srcs: []netip.Addr{
netip.MustParseAddr("2001:db8:1::2"),
netip.MustParseAddr("fe80::2"),
},
want: []IPAddr{
{IP: ParseIP("fe80::1")},
{IP: ParseIP("2001:db8:1::1")},
},
reverse: true,
},
// Issue 13283. Having a 10/8 source address does not
// mean we should prefer 23/8 destination addresses.
{
in: []IPAddr{
{IP: ParseIP("54.83.193.112")},
{IP: ParseIP("184.72.238.214")},
{IP: ParseIP("23.23.172.185")},
{IP: ParseIP("75.101.148.21")},
{IP: ParseIP("23.23.134.56")},
{IP: ParseIP("23.21.50.150")},
},
srcs: []netip.Addr{
netip.MustParseAddr("10.2.3.4"),
netip.MustParseAddr("10.2.3.4"),
netip.MustParseAddr("10.2.3.4"),
netip.MustParseAddr("10.2.3.4"),
netip.MustParseAddr("10.2.3.4"),
netip.MustParseAddr("10.2.3.4"),
},
want: []IPAddr{
{IP: ParseIP("54.83.193.112")},
{IP: ParseIP("184.72.238.214")},
{IP: ParseIP("23.23.172.185")},
{IP: ParseIP("75.101.148.21")},
{IP: ParseIP("23.23.134.56")},
{IP: ParseIP("23.21.50.150")},
},
reverse: false,
},
}
for i, tt := range tests {
inCopy := make([]IPAddr, len(tt.in))
copy(inCopy, tt.in)
srcCopy := make([]netip.Addr, len(tt.in))
copy(srcCopy, tt.srcs)
sortByRFC6724withSrcs(inCopy, srcCopy)
if !reflect.DeepEqual(inCopy, tt.want) {
t.Errorf("test %d:\nin = %s\ngot: %s\nwant: %s\n", i, tt.in, inCopy, tt.want)
}
if tt.reverse {
copy(inCopy, tt.in)
copy(srcCopy, tt.srcs)
for j := 0; j < len(inCopy)/2; j++ {
k := len(inCopy) - j - 1
inCopy[j], inCopy[k] = inCopy[k], inCopy[j]
srcCopy[j], srcCopy[k] = srcCopy[k], srcCopy[j]
}
sortByRFC6724withSrcs(inCopy, srcCopy)
if !reflect.DeepEqual(inCopy, tt.want) {
t.Errorf("test %d, starting backwards:\nin = %s\ngot: %s\nwant: %s\n", i, tt.in, inCopy, tt.want)
}
}
}
}
func TestRFC6724PolicyTableOrder(t *testing.T) {
for i := 0; i < len(rfc6724policyTable)-1; i++ {
if !(rfc6724policyTable[i].Prefix.Bits() >= rfc6724policyTable[i+1].Prefix.Bits()) {
t.Errorf("rfc6724policyTable item number %d sorted in wrong order = %d bits, next item = %d bits;", i, rfc6724policyTable[i].Prefix.Bits(), rfc6724policyTable[i+1].Prefix.Bits())
}
}
}
func TestRFC6724PolicyTableContent(t *testing.T) {
expectedRfc6724policyTable := policyTable{
{
Prefix: netip.MustParsePrefix("::1/128"),
Precedence: 50,
Label: 0,
},
{
Prefix: netip.MustParsePrefix("::ffff:0:0/96"),
Precedence: 35,
Label: 4,
},
{
Prefix: netip.MustParsePrefix("::/96"),
Precedence: 1,
Label: 3,
},
{
Prefix: netip.MustParsePrefix("2001::/32"),
Precedence: 5,
Label: 5,
},
{
Prefix: netip.MustParsePrefix("2002::/16"),
Precedence: 30,
Label: 2,
},
{
Prefix: netip.MustParsePrefix("3ffe::/16"),
Precedence: 1,
Label: 12,
},
{
Prefix: netip.MustParsePrefix("fec0::/10"),
Precedence: 1,
Label: 11,
},
{
Prefix: netip.MustParsePrefix("fc00::/7"),
Precedence: 3,
Label: 13,
},
{
Prefix: netip.MustParsePrefix("::/0"),
Precedence: 40,
Label: 1,
},
}
if !reflect.DeepEqual(rfc6724policyTable, expectedRfc6724policyTable) {
t.Errorf("rfc6724policyTable has wrong contend = %v; want %v", rfc6724policyTable, expectedRfc6724policyTable)
}
}
func TestRFC6724PolicyTableClassify(t *testing.T) {
tests := []struct {
ip netip.Addr
want policyTableEntry
}{
{
ip: netip.MustParseAddr("127.0.0.1"),
want: policyTableEntry{
Prefix: netip.MustParsePrefix("::ffff:0:0/96"),
Precedence: 35,
Label: 4,
},
},
{
ip: netip.MustParseAddr("2601:645:8002:a500:986f:1db8:c836:bd65"),
want: policyTableEntry{
Prefix: netip.MustParsePrefix("::/0"),
Precedence: 40,
Label: 1,
},
},
{
ip: netip.MustParseAddr("::1"),
want: policyTableEntry{
Prefix: netip.MustParsePrefix("::1/128"),
Precedence: 50,
Label: 0,
},
},
{
ip: netip.MustParseAddr("2002::ab12"),
want: policyTableEntry{
Prefix: netip.MustParsePrefix("2002::/16"),
Precedence: 30,
Label: 2,
},
},
}
for i, tt := range tests {
got := rfc6724policyTable.Classify(tt.ip)
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("%d. Classify(%s) = %v; want %v", i, tt.ip, got, tt.want)
}
}
}
func TestRFC6724ClassifyScope(t *testing.T) {
tests := []struct {
ip netip.Addr
want scope
}{
{netip.MustParseAddr("127.0.0.1"), scopeLinkLocal}, // rfc6724#section-3.2
{netip.MustParseAddr("::1"), scopeLinkLocal}, // rfc4007#section-4
{netip.MustParseAddr("169.254.1.2"), scopeLinkLocal}, // rfc6724#section-3.2
{netip.MustParseAddr("fec0::1"), scopeSiteLocal},
{netip.MustParseAddr("8.8.8.8"), scopeGlobal},
{netip.MustParseAddr("ff02::"), scopeLinkLocal}, // IPv6 multicast
{netip.MustParseAddr("ff05::"), scopeSiteLocal}, // IPv6 multicast
{netip.MustParseAddr("ff04::"), scopeAdminLocal}, // IPv6 multicast
{netip.MustParseAddr("ff0e::"), scopeGlobal}, // IPv6 multicast
{netip.AddrFrom16([16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xe0, 0, 0, 0}), scopeGlobal}, // IPv4 link-local multicast as 16 bytes
{netip.AddrFrom16([16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xe0, 2, 2, 2}), scopeGlobal}, // IPv4 global multicast as 16 bytes
{netip.AddrFrom4([4]byte{0xe0, 0, 0, 0}), scopeGlobal}, // IPv4 link-local multicast as 4 bytes
{netip.AddrFrom4([4]byte{0xe0, 2, 2, 2}), scopeGlobal}, // IPv4 global multicast as 4 bytes
}
for i, tt := range tests {
got := classifyScope(tt.ip)
if got != tt.want {
t.Errorf("%d. classifyScope(%s) = %x; want %x", i, tt.ip, got, tt.want)
}
}
}
func TestRFC6724CommonPrefixLength(t *testing.T) {
tests := []struct {
a netip.Addr
b IP
want int
}{
{netip.MustParseAddr("fe80::1"), ParseIP("fe80::2"), 64},
{netip.MustParseAddr("fe81::1"), ParseIP("fe80::2"), 15},
{netip.MustParseAddr("127.0.0.1"), ParseIP("fe80::1"), 0}, // diff size
{netip.AddrFrom4([4]byte{1, 2, 3, 4}), IP{1, 2, 3, 4}, 32},
{netip.AddrFrom4([4]byte{1, 2, 255, 255}), IP{1, 2, 0, 0}, 16},
{netip.AddrFrom4([4]byte{1, 2, 127, 255}), IP{1, 2, 0, 0}, 17},
{netip.AddrFrom4([4]byte{1, 2, 63, 255}), IP{1, 2, 0, 0}, 18},
{netip.AddrFrom4([4]byte{1, 2, 31, 255}), IP{1, 2, 0, 0}, 19},
{netip.AddrFrom4([4]byte{1, 2, 15, 255}), IP{1, 2, 0, 0}, 20},
{netip.AddrFrom4([4]byte{1, 2, 7, 255}), IP{1, 2, 0, 0}, 21},
{netip.AddrFrom4([4]byte{1, 2, 3, 255}), IP{1, 2, 0, 0}, 22},
{netip.AddrFrom4([4]byte{1, 2, 1, 255}), IP{1, 2, 0, 0}, 23},
{netip.AddrFrom4([4]byte{1, 2, 0, 255}), IP{1, 2, 0, 0}, 24},
}
for i, tt := range tests {
got := commonPrefixLen(tt.a, tt.b)
if got != tt.want {
t.Errorf("%d. commonPrefixLen(%s, %s) = %d; want %d", i, tt.a, tt.b, got, tt.want)
}
}
}