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update_test.go
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package corebgp
import (
"errors"
"fmt"
"net/netip"
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
type updateMessageForTests struct {
addPath bool
withdrawn []netip.Prefix
addPathWithdrawn []AddPathPrefix
origin uint8
asPath []uint32
communities []uint32
largeCommunities LargeCommunitiesPathAttr
localPref uint32
med uint32
nextHop netip.Addr
nlri []netip.Prefix
addPathNLRI []AddPathPrefix
ipv6NextHops []netip.Addr
addPathIPv6NLRI []AddPathPrefix
ipv6NLRI []netip.Prefix
addPathIPv6Withdrawn []AddPathPrefix
ipv6Withdrawn []netip.Prefix
}
func newPathAttrsDecodeFn() func(m *updateMessageForTests, code uint8, flags PathAttrFlags, b []byte) error {
reachDecodeFn := NewMPReachNLRIDecodeFn[*updateMessageForTests](
func(m *updateMessageForTests, afi uint16, safi uint8, nh, nlri []byte) error {
if afi == AFI_IPV6 && safi == SAFI_UNICAST {
nhs, err := DecodeMPReachIPv6NextHops(nh)
if err != nil {
return err
}
if m.addPath {
prefixes, err := DecodeMPIPv6AddPathPrefixes(nlri)
if err != nil {
return err
}
m.addPathIPv6NLRI = prefixes
} else {
prefixes, err := DecodeMPIPv6Prefixes(nlri)
if err != nil {
return err
}
m.ipv6NLRI = prefixes
}
m.ipv6NextHops = nhs
}
return nil
},
)
unreachDecodeFn := NewMPUnreachNLRIDecodeFn[*updateMessageForTests](
func(m *updateMessageForTests, afi uint16, safi uint8, withdrawn []byte) error {
if afi == AFI_IPV6 && safi == SAFI_UNICAST {
if m.addPath {
prefixes, err := DecodeMPIPv6AddPathPrefixes(withdrawn)
if err != nil {
return err
}
m.addPathIPv6Withdrawn = prefixes
} else {
prefixes, err := DecodeMPIPv6Prefixes(withdrawn)
if err != nil {
return err
}
m.ipv6Withdrawn = prefixes
}
}
return nil
},
)
return func(m *updateMessageForTests, code uint8, flags PathAttrFlags, b []byte) error {
switch code {
case PATH_ATTR_ORIGIN:
var o OriginPathAttr
err := o.Decode(flags, b)
if err != nil {
return err
}
m.origin = uint8(o)
return nil
case PATH_ATTR_AS_PATH:
var a ASPathAttr
err := a.Decode(flags, b)
if err != nil {
return err
}
m.asPath = a.ASSequence
return nil
case PATH_ATTR_NEXT_HOP:
var nh NextHopPathAttr
err := nh.Decode(flags, b)
if err != nil {
return err
}
m.nextHop = netip.Addr(nh)
return nil
case PATH_ATTR_COMMUNITY:
var comms CommunitiesPathAttr
err := comms.Decode(flags, b)
if err != nil {
return err
}
m.communities = comms
case PATH_ATTR_LOCAL_PREF:
var lpref LocalPrefPathAttr
if err := lpref.Decode(flags, b); err != nil {
fmt.Printf("error decoding local pref: %v", err)
return err
}
m.localPref = uint32(lpref)
case PATH_ATTR_LARGE_COMMUNITY:
var lc LargeCommunitiesPathAttr
if err := lc.Decode(flags, b); err != nil {
return err
}
m.largeCommunities = lc
case PATH_ATTR_MED:
var med MEDPathAttr
if err := med.Decode(flags, b); err != nil {
fmt.Printf("error decoding med: %v", err)
return err
}
m.med = uint32(med)
case PATH_ATTR_MP_REACH_NLRI:
return reachDecodeFn(m, flags, b)
case PATH_ATTR_MP_UNREACH_NLRI:
return unreachDecodeFn(m, flags, b)
case PATH_ATTR_ATOMIC_AGGREGATE:
var aa AtomicAggregatePathAttr
return aa.Decode(flags, b)
}
return nil
}
}
func FuzzUpdateDecoder_Decode(f *testing.F) {
f.Add([]byte{
0x00, 0x03, // withdrawn routes length
0x10, 0x0a, 0x00, // withdrawn 10.0.0.0/16
0x00, 0x14, // total path attribute length
0x40, 0x01, 0x01, 0x01, // origin egp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x08, 0x0a, // nlri 10.0.0.0/8
})
f.Add([]byte{
0x00, 0x07, // withdrawn routes length
0x00, 0x00, 0x00, 0x01, 0x10, 0x0a, 0x00, // withdrawn id 1 10.0.0.0/16
0x00, 0x14, // total path attribute length
0x40, 0x01, 0x01, 0x01, // origin egp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x00, 0x00, 0x00, 0x02, 0x08, 0x0a, // nlri id 2 10.0.0.0/8
})
f.Add([]byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x3f, // total path attribute length
// extended len MP_REACH_NLRI 2001:db8::/64 nhs 2001:db8::2 & fe80::42:c0ff:fe00:202
0x90, 0x0e, 0x00, 0x2e, 0x00, 0x02, 0x01, 0x20, 0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0xc0, 0xff, 0xfe, 0x00, 0x02, 0x02, 0x00, 0x40, 0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00,
0x40, 0x01, 0x01, 0x00, // origin igp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
})
f.Add([]byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x09, // total path attribute length
0x90, 0x0f, 0x00, 0x05, 0x00, 0x02, 0x01, 0x07, 0xfc, // empty IPv6 MP_UNREACH_NLRI
})
f.Fuzz(func(t *testing.T, b []byte) {
ud := NewUpdateDecoder[*updateMessageForTests](
NewWithdrawnRoutesDecodeFn(func(m *updateMessageForTests, r []netip.Prefix) error {
m.withdrawn = r
return nil
}),
newPathAttrsDecodeFn(),
NewNLRIDecodeFn(func(m *updateMessageForTests, r []netip.Prefix) error {
m.nlri = r
return nil
}),
)
m := &updateMessageForTests{}
ud.Decode(m, b)
})
}
func newWithdrawnRoutesDecodeFn() DecodeFn[*updateMessageForTests] {
fn := NewWithdrawnRoutesDecodeFn[*updateMessageForTests](func(u *updateMessageForTests, p []netip.Prefix) error {
u.withdrawn = p
return nil
})
apFn := NewWithdrawnAddPathRoutesDecodeFn[*updateMessageForTests](func(u *updateMessageForTests, a []AddPathPrefix) error {
u.addPathWithdrawn = a
return nil
})
return func(u *updateMessageForTests, b []byte) error {
if u.addPath {
return apFn(u, b)
}
return fn(u, b)
}
}
func newNLRIDecodeFn() DecodeFn[*updateMessageForTests] {
fn := NewNLRIDecodeFn[*updateMessageForTests](func(u *updateMessageForTests, p []netip.Prefix) error {
u.nlri = p
return nil
})
apFn := NewNLRIAddPathDecodeFn[*updateMessageForTests](func(u *updateMessageForTests, a []AddPathPrefix) error {
u.addPathNLRI = a
return nil
})
return func(u *updateMessageForTests, b []byte) error {
if u.addPath {
return apFn(u, b)
}
return fn(u, b)
}
}
func TestUpdateDecoder_Decode(t *testing.T) {
ud := NewUpdateDecoder[*updateMessageForTests](
newWithdrawnRoutesDecodeFn(),
newPathAttrsDecodeFn(),
newNLRIDecodeFn(),
)
t.Run("valid data", func(t *testing.T) {
cases := []struct {
name string
toDecode []byte
want *updateMessageForTests
}{
{
name: "IPv4 withdrawn and IPv4 nlri",
toDecode: []byte{
0x00, 0x05, // withdrawn routes length
0x10, 0x0a, 0x00, // withdrawn 10.0.0.0/16
0x08, 0x01, // withdrawn 1.0.0.0/8
0x00, 0x14, // total path attribute length
0x40, 0x01, 0x01, 0x01, // origin egp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x08, 0x0a, // nlri 10.0.0.0/8
0x18, 0x01, 0x00, 0x00, // nlri 1.0.0.0/24
},
want: &updateMessageForTests{
withdrawn: []netip.Prefix{
netip.MustParsePrefix("10.0.0.0/16"),
netip.MustParsePrefix("1.0.0.0/8"),
},
origin: 1,
asPath: []uint32{65002},
nextHop: netip.MustParseAddr("192.0.2.2"),
nlri: []netip.Prefix{
netip.MustParsePrefix("10.0.0.0/8"),
netip.MustParsePrefix("1.0.0.0/24"),
},
},
},
{
name: "add-path IPv4 withdrawn and IPv4 nlri",
toDecode: []byte{
0x00, 0x0f, // withdrawn routes length
0x00, 0x00, 0x00, 0x01, 0x10, 0x0a, 0x00, // withdrawn id 1 10.0.0.0/16
0x00, 0x00, 0x00, 0x02, 0x18, 0x0a, 0x00, 0x00, // withdrawn id 2 10.0.0.0/24
0x00, 0x14, // total path attribute length
0x40, 0x01, 0x01, 0x01, // origin egp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x00, 0x00, 0x00, 0x02, 0x08, 0x0a, // nlri id 2 10.0.0.0/8
},
want: &updateMessageForTests{
addPath: true,
addPathWithdrawn: []AddPathPrefix{
{netip.MustParsePrefix("10.0.0.0/16"), 1},
{netip.MustParsePrefix("10.0.0.0/24"), 2},
},
origin: 1,
asPath: []uint32{65002},
nextHop: netip.MustParseAddr("192.0.2.2"),
addPathNLRI: []AddPathPrefix{
{netip.MustParsePrefix("10.0.0.0/8"), 2},
},
},
},
{
name: "MP_UNREACH_NLRI IPv6 prefixes",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x0b, // total path attribute length
0x90, 0x0f, 0x00, 0x07, 0x00, 0x02, 0x01, 0x07, 0xfc, 0x07, 0xfa, // extended len IPv6 MP_UNREACH_NLRI fc00::/7 fa00::/7
},
want: &updateMessageForTests{
ipv6Withdrawn: []netip.Prefix{
netip.MustParsePrefix("fc00::/7"),
netip.MustParsePrefix("fa00::/7"),
},
},
},
{
name: "add-path MP_UNREACH_NLRI IPv6 prefixes",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x13, // total path attribute length
0x90, 0x0f, 0x00, 0x0f, 0x00, 0x02, 0x01, 0x00, 0x00, 0x00, 0x01, 0x07, 0xfc, 0x00, 0x00, 0x00, 0x02, 0x07, 0xfa, // extended len IPv6 MP_UNREACH_NLRI id 1 fc00::/7 id 2 fa00::/7
},
want: &updateMessageForTests{
addPath: true,
addPathIPv6Withdrawn: []AddPathPrefix{
{
Prefix: netip.MustParsePrefix("fc00::/7"),
ID: 1,
},
{
Prefix: netip.MustParsePrefix("fa00::/7"),
ID: 2,
},
},
},
},
{
name: "MP_UNREACH_NLRI IPv6 end-of-rib",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x06, // total path attribute length
0x80, 0x0f, 0x03, 0x00, 0x02, 0x01, // optional MP_UNREACH_NLRI len 3
},
want: &updateMessageForTests{},
},
{
name: "add-path MP_REACH_NLRI IPv6 prefixes",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x50, // total path attribute length
// extended len MP_REACH_NLRI
0x90, 0x0e, 0x00, 0x3F, 0x00, 0x02, 0x01, 0x20,
// nh 2001:db8::2
0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
// nh fe80::42:c0ff:fe00:202
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0xc0, 0xff, 0xfe, 0x00, 0x02, 0x02,
0x00, // reserved
// id 1 2001:db8::/64
0x00, 0x00, 0x00, 0x01, 0x40, 0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00,
// id 2 2001:db9::/64
0x00, 0x00, 0x00, 0x02, 0x40, 0x20, 0x01, 0x0d, 0xb9, 0x00, 0x00, 0x00, 0x00,
0x40, 0x01, 0x01, 0x00, // origin igp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
},
want: &updateMessageForTests{
addPath: true,
asPath: []uint32{65002},
addPathIPv6NLRI: []AddPathPrefix{
{
Prefix: netip.MustParsePrefix("2001:db8::/64"),
ID: 1,
},
{
Prefix: netip.MustParsePrefix("2001:db9::/64"),
ID: 2,
},
},
ipv6NextHops: []netip.Addr{
netip.MustParseAddr("2001:db8::2"),
netip.MustParseAddr("fe80::42:c0ff:fe00:202"),
},
},
},
{
name: "MP_REACH_NLRI IPv6 prefix",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x48, // total path attribute length
// extended len MP_REACH_NLRI
0x90, 0x0e, 0x00, 0x37, 0x00, 0x02, 0x01, 0x20,
// nh 2001:db8::2
0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
// nh fe80::42:c0ff:fe00:202
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0xc0, 0xff, 0xfe, 0x00, 0x02, 0x02,
0x00, // reserved
// 2001:db8::/64
0x40, 0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00,
// 2001:db9::/64
0x40, 0x20, 0x01, 0x0d, 0xb9, 0x00, 0x00, 0x00, 0x00,
0x40, 0x01, 0x01, 0x00, // origin igp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
},
want: &updateMessageForTests{
asPath: []uint32{65002},
ipv6NLRI: []netip.Prefix{
netip.MustParsePrefix("2001:db8::/64"),
netip.MustParsePrefix("2001:db9::/64"),
},
ipv6NextHops: []netip.Addr{
netip.MustParseAddr("2001:db8::2"),
netip.MustParseAddr("fe80::42:c0ff:fe00:202"),
},
},
},
{
name: "add-path bird bug",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x14, // total path attribute length
0x40, 0x01, 0x01, 0x00, // origin igp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next hop 192.0.2.2
0x00, 0x00, 0x00, 0x06, 0x18, 0xc0, 0x00, 0x02, // id 6 192.0.2.0/24
},
want: &updateMessageForTests{
addPath: true,
asPath: []uint32{65002},
nextHop: netip.MustParseAddr("192.0.2.2"),
addPathNLRI: []AddPathPrefix{
{
Prefix: netip.MustParsePrefix("192.0.2.0/24"),
ID: 6,
},
},
},
},
{
name: "decode lpref, med, communities, large communities",
toDecode: []byte{
0x00, 0x00, // withdrawn routes length
0x00, 0x40, // total path attribute length
0x40, 0x01, 0x01, 0x00, // origin igp
0x40, 0x02, 0x0a, 0x02, 0x02, 0x00, 0x00, 0xfe, 0x4c, 0x00, 0x00, 0xfe, 0x4c, // as_path 65100 65100
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x80, 0x04, 0x04, 0x00, 0x00, 0x00, 0x62, // med 98
0x40, 0x05, 0x04, 0x00, 0x00, 0x00, 0x32, // local pref 50
0xc0, 0x08, 0x08, 0x00, 0x64, 0x00, 0xc8, 0x01, 0x2c, 0x01, 0x90, // communities 100:200 300:400
0xc0, 0x20, 0x0c, 0x00, 0x00, 0xfe, 0x50, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, // large-communities 65104:1:1
0x18, 0xc6, 0x33, 0x64, // nlri 198.51.100.0/24
},
want: &updateMessageForTests{
asPath: []uint32{65100, 65100},
nextHop: netip.MustParseAddr("192.0.2.2"),
med: 98,
localPref: 50,
communities: []uint32{6553800, 19661200},
largeCommunities: LargeCommunitiesPathAttr{
{
GlobalAdmin: 65104,
LocalData1: 1,
LocalData2: 1,
},
},
nlri: []netip.Prefix{
netip.MustParsePrefix("198.51.100.0/24"),
},
},
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
m := &updateMessageForTests{}
m.addPath = tt.want.addPath
n := ud.Decode(m, tt.toDecode)
if n != nil {
t.Fatalf("error decoding: %v", n)
}
if !reflect.DeepEqual(tt.want, m) {
t.Fatalf("want: %+v != got: %+v", tt.want, m)
}
})
}
})
t.Run("invalid data", func(t *testing.T) {
cases := []struct {
name string
toDecode []byte
wantNotification bool
wantAsWithdraw bool
wantAttrDiscard bool
}{
{
name: "less than 4 bytes",
toDecode: []byte{
0x00, 0x03, // withdrawn routes length
},
wantNotification: true,
},
{
name: "missing origin",
toDecode: []byte{
0x00, 0x03, // withdrawn routes length
0x10, 0x0a, 0x00, // withdrawn 10.0.0.0/16
0x00, 0x10, // total path attribute length
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0x08, 0x0a, // nlri 10.0.0.0/8
},
wantAsWithdraw: true,
},
{
name: "nonzero atomic aggregate",
toDecode: []byte{
0x00, 0x03, // withdrawn routes length
0x10, 0x0a, 0x00, // withdrawn 10.0.0.0/16
0x00, 0x18, // total path attribute length
0x40, 0x01, 0x01, 0x01, // origin egp
0x40, 0x02, 0x06, 0x02, 0x01, 0x00, 0x00, 0xfd, 0xea, // as_path 65002
0x40, 0x03, 0x04, 0xc0, 0x00, 0x02, 0x02, // next_hop 192.0.2.2
0xc0, 0x06, 0x01, 0x01, // invalid atomic aggregate
0x08, 0x0a, // nlri 10.0.0.0/8
},
wantAttrDiscard: true,
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
m := &updateMessageForTests{}
n := ud.Decode(m, tt.toDecode)
if n == nil {
t.Fatal("Decode() returned nil")
}
var (
notif *Notification
asWithdraw *TreatAsWithdrawUpdateErr
attrDiscard *AttrDiscardUpdateErr
)
if tt.wantNotification && !errors.As(n, ¬if) {
t.Error("wanted notification error, none found")
}
if tt.wantAsWithdraw && !errors.As(n, &asWithdraw) {
t.Error("wanted treat as withdraw error, none found")
}
if tt.wantAttrDiscard && !errors.As(n, &attrDiscard) {
t.Error("wanted attr discard error, none found")
}
})
}
})
}
type fakeUpdateError struct {
*Notification
}
func (f fakeUpdateError) AsSessionReset() *Notification {
return f.Notification
}
func TestUpdateNotificationFromErr(t *testing.T) {
type args struct {
err error
}
tests := []struct {
name string
args args
want *Notification
}{
{
name: "notification",
args: args{
err: errors.Join(
&Notification{Code: 1},
&Notification{Code: 2},
),
},
want: &Notification{Code: 1},
},
{
name: "treat as withdraw",
args: args{
err: errors.Join(
&TreatAsWithdrawUpdateErr{Notification: &Notification{Code: 1}},
&AttrDiscardUpdateErr{Notification: &Notification{Code: 2}},
),
},
want: &Notification{Code: 1},
},
{
name: "attr discard",
args: args{
err: errors.Join(
&AttrDiscardUpdateErr{Notification: &Notification{Code: 1}},
&fakeUpdateError{Notification: &Notification{Code: 2}},
),
},
want: &Notification{Code: 1},
},
{
name: "update error",
args: args{
err: errors.Join(
errors.New("not a notification"),
&fakeUpdateError{Notification: &Notification{Code: 1}},
),
},
want: &Notification{Code: 1},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
assert.Equalf(t, tt.want, UpdateNotificationFromErr(tt.args.err), "UpdateNotificationFromErr(%v)", tt.args.err)
})
}
}