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-rw-r--r--packet/bgp.go162
-rw-r--r--packet/bgp_test.go27
2 files changed, 132 insertions, 57 deletions
diff --git a/packet/bgp.go b/packet/bgp.go
index 59d62915..fcbb3bd1 100644
--- a/packet/bgp.go
+++ b/packet/bgp.go
@@ -1151,9 +1151,81 @@ func NewPathAttributeOrigin(value uint8) *PathAttributeOrigin {
type AsPathParam struct {
Type uint8
Num uint8
+ AS []uint16
+}
+
+func (a *AsPathParam) Serialize() ([]byte, error) {
+ buf := make([]byte, 2+len(a.AS)*2)
+ buf[0] = a.Type
+ buf[1] = a.Num
+ for j, as := range a.AS {
+ binary.BigEndian.PutUint16(buf[2+j*2:], as)
+ }
+ return buf, nil
+}
+
+func (a *AsPathParam) DecodeFromBytes(data []byte) error {
+ a.Type = data[0]
+ a.Num = data[1]
+ data = data[2:]
+ for i := 0; i < int(a.Num); i++ {
+ a.AS = append(a.AS, binary.BigEndian.Uint16(data))
+ data = data[2:]
+ }
+ return nil
+}
+
+func (a *AsPathParam) Len() int {
+ return 2 + len(a.AS)*2
+}
+
+func NewAsPathParam(segType uint8, as []uint16) *AsPathParam {
+ return &AsPathParam{
+ Type: segType,
+ Num: uint8(len(as)),
+ AS: as,
+ }
+}
+
+type As4PathParam struct {
+ Type uint8
+ Num uint8
AS []uint32
}
+func (a *As4PathParam) Serialize() ([]byte, error) {
+ buf := make([]byte, 2+len(a.AS)*4)
+ buf[0] = a.Type
+ buf[1] = a.Num
+ for j, as := range a.AS {
+ binary.BigEndian.PutUint32(buf[2+j*4:], as)
+ }
+ return buf, nil
+}
+
+func (a *As4PathParam) DecodeFromBytes(data []byte) error {
+ a.Type = data[0]
+ a.Num = data[1]
+ data = data[2:]
+ for i := 0; i < int(a.Num); i++ {
+ a.AS = append(a.AS, binary.BigEndian.Uint32(data))
+ data = data[4:]
+ }
+ return nil
+}
+
+func (a *As4PathParam) Len() int {
+ return 2 + len(a.AS)*4
+}
+
+func NewAs4PathParam(segType uint8, as []uint32) *As4PathParam {
+ return &As4PathParam{
+ Type: segType,
+ Num: uint8(len(as)),
+ AS: as,
+ }
+}
+
type DefaultAsPath struct {
}
@@ -1173,53 +1245,32 @@ func (p *DefaultAsPath) isValidAspath(data []byte) bool {
return true
}
-// TODO: could marge two functions nicely with reflect?
-func (p *DefaultAsPath) decodeAspath(data []byte) []AsPathParam {
- var param []AsPathParam
-
- for len(data) > 0 {
- a := AsPathParam{}
- a.Type = data[0]
- a.Num = data[1]
- data = data[2:]
- for i := 0; i < int(a.Num); i++ {
- a.AS = append(a.AS, uint32(binary.BigEndian.Uint16(data)))
- data = data[2:]
- }
- param = append(param, a)
- }
- return param
-}
-
-func (p *DefaultAsPath) decodeAs4path(data []byte) []AsPathParam {
- var param []AsPathParam
-
- for len(data) > 0 {
- a := AsPathParam{}
- a.Type = data[0]
- a.Num = data[1]
- data = data[2:]
- for i := 0; i < int(a.Num); i++ {
- a.AS = append(a.AS, binary.BigEndian.Uint32(data))
- data = data[4:]
- }
- param = append(param, a)
- }
- return param
+type AsPathParamInterface interface {
+ Serialize() ([]byte, error)
+ DecodeFromBytes([]byte) error
+ Len() int
}
type PathAttributeAsPath struct {
DefaultAsPath
PathAttribute
- Value []AsPathParam
+ Value []AsPathParamInterface
}
func (p *PathAttributeAsPath) DecodeFromBytes(data []byte) error {
p.PathAttribute.DecodeFromBytes(data)
- if p.DefaultAsPath.isValidAspath(p.PathAttribute.Value) {
- p.Value = p.DefaultAsPath.decodeAspath(p.PathAttribute.Value)
- } else {
- p.Value = p.DefaultAsPath.decodeAs4path(p.PathAttribute.Value)
+ validAs := p.DefaultAsPath.isValidAspath(p.PathAttribute.Value)
+ v := p.PathAttribute.Value
+ for len(v) > 0 {
+ var tuple AsPathParamInterface
+ if validAs == true {
+ tuple = &AsPathParam{}
+ } else {
+ tuple = &As4PathParam{}
+ }
+ tuple.DecodeFromBytes(v)
+ p.Value = append(p.Value, tuple)
+ v = v[tuple.Len():]
}
return nil
}
@@ -1227,11 +1278,9 @@ func (p *PathAttributeAsPath) DecodeFromBytes(data []byte) error {
func (p *PathAttributeAsPath) Serialize() ([]byte, error) {
buf := make([]byte, 0)
for _, v := range p.Value {
- vbuf := make([]byte, 2+len(v.AS)*2)
- vbuf[0] = v.Type
- vbuf[1] = v.Num
- for j, as := range v.AS {
- binary.BigEndian.PutUint16(vbuf[2+j*2:], uint16(as))
+ vbuf, err := v.Serialize()
+ if err != nil {
+ return nil, err
}
buf = append(buf, vbuf...)
}
@@ -1239,7 +1288,7 @@ func (p *PathAttributeAsPath) Serialize() ([]byte, error) {
return p.PathAttribute.Serialize()
}
-func NewPathAttributeAsPath(value []AsPathParam) *PathAttributeAsPath {
+func NewPathAttributeAsPath(value []AsPathParamInterface) *PathAttributeAsPath {
return &PathAttributeAsPath{
PathAttribute: PathAttribute{
Flags: BGP_ATTR_FLAG_TRANSITIVE,
@@ -1733,17 +1782,36 @@ func NewPathAttributeExtendedCommunities(value []ExtendedCommunityInterface) *Pa
type PathAttributeAs4Path struct {
PathAttribute
- Value []AsPathParam
+ Value []*As4PathParam
DefaultAsPath
}
func (p *PathAttributeAs4Path) DecodeFromBytes(data []byte) error {
p.PathAttribute.DecodeFromBytes(data)
- p.Value = p.DefaultAsPath.decodeAs4path(p.PathAttribute.Value)
+ v := p.PathAttribute.Value
+ for len(v) > 0 {
+ tuple := &As4PathParam{}
+ tuple.DecodeFromBytes(v)
+ p.Value = append(p.Value, tuple)
+ v = v[tuple.Len():]
+ }
return nil
}
-func NewPathAttributeAs4Path(value []AsPathParam) *PathAttributeAs4Path {
+func (p *PathAttributeAs4Path) Serialize() ([]byte, error) {
+ buf := make([]byte, 0)
+ for _, v := range p.Value {
+ vbuf, err := v.Serialize()
+ if err != nil {
+ return nil, err
+ }
+ buf = append(buf, vbuf...)
+ }
+ p.PathAttribute.Value = buf
+ return p.PathAttribute.Serialize()
+}
+
+func NewPathAttributeAs4Path(value []*As4PathParam) *PathAttributeAs4Path {
return &PathAttributeAs4Path{
PathAttribute: PathAttribute{
Flags: BGP_ATTR_FLAG_TRANSITIVE,
diff --git a/packet/bgp_test.go b/packet/bgp_test.go
index fc0c9eb7..59734ba4 100644
--- a/packet/bgp_test.go
+++ b/packet/bgp_test.go
@@ -38,16 +38,22 @@ func update() *BGPMessage {
w2 := WithdrawnRoute{*NewIPAddrPrefix(17, "100.33.3.0")}
w := []WithdrawnRoute{w1, w2}
- aspath := []AsPathParam{
- AsPathParam{Type: 2, Num: 1, AS: []uint32{1000}},
- AsPathParam{Type: 1, Num: 2, AS: []uint32{1001, 1002}},
- AsPathParam{Type: 2, Num: 2, AS: []uint32{1003, 1004}},
+ aspath1 := []AsPathParamInterface{
+ NewAsPathParam(2, []uint16{1000}),
+ NewAsPathParam(1, []uint16{1001, 1002}),
+ NewAsPathParam(2, []uint16{1003, 1004}),
}
- aspath2 := []AsPathParam{
- AsPathParam{Type: 2, Num: 1, AS: []uint32{1000000}},
- AsPathParam{Type: 1, Num: 2, AS: []uint32{1000001, 1002}},
- AsPathParam{Type: 2, Num: 2, AS: []uint32{1003, 100004}},
+ aspath2 := []AsPathParamInterface{
+ NewAs4PathParam(2, []uint32{1000000}),
+ NewAs4PathParam(1, []uint32{1000001, 1002}),
+ NewAs4PathParam(2, []uint32{1003, 100004}),
+ }
+
+ aspath3 := []*As4PathParam{
+ NewAs4PathParam(2, []uint32{1000000}),
+ NewAs4PathParam(1, []uint32{1000001, 1002}),
+ NewAs4PathParam(2, []uint32{1003, 100004}),
}
ecommunities := []ExtendedCommunityInterface{
@@ -77,7 +83,8 @@ func update() *BGPMessage {
p := []PathAttributeInterface{
NewPathAttributeOrigin(3),
- NewPathAttributeAsPath(aspath),
+ NewPathAttributeAsPath(aspath1),
+ NewPathAttributeAsPath(aspath2),
NewPathAttributeNextHop("129.1.1.2"),
NewPathAttributeMultiExitDisc(1 << 20),
NewPathAttributeLocalPref(1 << 22),
@@ -87,7 +94,7 @@ func update() *BGPMessage {
NewPathAttributeOriginatorId("10.10.0.1"),
NewPathAttributeClusterList([]string{"10.10.0.2", "10.10.0.3"}),
NewPathAttributeExtendedCommunities(ecommunities),
- NewPathAttributeAs4Path(aspath2),
+ NewPathAttributeAs4Path(aspath3),
NewPathAttributeAs4Aggregator(10000, "112.22.2.1"),
NewPathAttributeMpReachNLRI("112.22.2.0", mp_nlri),
NewPathAttributeMpReachNLRI("1023::", mp_nlri2),
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 05:50:47 +0000