func ParsePath(rf bgp.RouteFamily, args []string) (*api.Path, error) {
var nlri bgp.AddrPrefixInterface
var extcomms []string
var err error
attrs := table.PathAttrs(make([]bgp.PathAttributeInterface, 0, 1))
path := &api.Path{
Pattrs: make([][]byte, 0),
}
fns := []func([]string) ([]string, bgp.PathAttributeInterface, error){
extractOrigin,
extractMed,
extractLocalPref,
extractCommunity,
extractAigp,
}
for _, fn := range fns {
var a bgp.PathAttributeInterface
args, a, err = fn(args)
if err != nil {
return nil, err
}
if a != nil {
attrs = append(attrs, a)
}
}
args, nexthop, err := extractNexthop(rf, args)
if err != nil {
return nil, err
}
switch rf {
case bgp.RF_IPv4_UC, bgp.RF_IPv6_UC:
if len(args) < 1 {
return nil, fmt.Errorf("invalid format")
}
ip, net, err := net.ParseCIDR(args[0])
if err != nil {
return nil, err
}
ones, _ := net.Mask.Size()
if rf == bgp.RF_IPv4_UC {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewIPAddrPrefix(uint8(ones), ip.String())
} else {
if ip.To16() == nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewIPv6AddrPrefix(uint8(ones), ip.String())
}
extcomms = args[1:]
case bgp.RF_IPv4_VPN, bgp.RF_IPv6_VPN:
if len(args) < 3 || args[1] != "rd" {
return nil, fmt.Errorf("invalid format")
}
ip, net, _ := net.ParseCIDR(args[0])
ones, _ := net.Mask.Size()
rd, err := bgp.ParseRouteDistinguisher(args[2])
if err != nil {
return nil, err
}
extcomms = args[3:]
mpls := bgp.NewMPLSLabelStack()
if rf == bgp.RF_IPv4_VPN {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewLabeledVPNIPAddrPrefix(uint8(ones), ip.String(), *mpls, rd)
} else {
if ip.To16() == nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewLabeledVPNIPv6AddrPrefix(uint8(ones), ip.String(), *mpls, rd)
}
case bgp.RF_IPv4_MPLS, bgp.RF_IPv6_MPLS:
if len(args) < 2 {
return nil, fmt.Errorf("invalid format")
}
ip, net, _ := net.ParseCIDR(args[0])
ones, _ := net.Mask.Size()
mpls, err := bgp.ParseMPLSLabelStack(args[1])
if err != nil {
return nil, err
}
extcomms = args[2:]
if rf == bgp.RF_IPv4_MPLS {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewLabeledIPAddrPrefix(uint8(ones), ip.String(), *mpls)
} else {
if ip.To4() != nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewLabeledIPv6AddrPrefix(uint8(ones), ip.String(), *mpls)
}
case bgp.RF_EVPN:
nlri, extcomms, err = ParseEvpnArgs(args)
case bgp.RF_FS_IPv4_UC, bgp.RF_FS_IPv6_UC, bgp.RF_FS_L2_VPN:
nlri, extcomms, err = ParseFlowSpecArgs(rf, args)
case bgp.RF_OPAQUE:
m := extractReserved(args, []string{"key", "value"})
if len(m["key"]) != 1 || len(m["value"]) != 1 {
return nil, fmt.Errorf("invalid key-value format")
}
nlri = bgp.NewOpaqueNLRI([]byte(m["key"][0]))
attrs = append(attrs, bgp.NewPathAttributeOpaqueValue([]byte(m["value"][0])))
default:
return nil, fmt.Errorf("Unsupported route family: %s", rf)
}
if err != nil {
return nil, err
}
if rf == bgp.RF_IPv4_UC {
path.Nlri, _ = nlri.Serialize()
attrs = append(attrs, bgp.NewPathAttributeNextHop(nexthop))
} else {
mpreach := bgp.NewPathAttributeMpReachNLRI(nexthop, []bgp.AddrPrefixInterface{nlri})
attrs = append(attrs, mpreach)
}
if extcomms != nil && len(extcomms) > 0 {
extcomms, err := ParseExtendedCommunities(strings.Join(extcomms, " "))
if err != nil {
return nil, err
}
p := bgp.NewPathAttributeExtendedCommunities(extcomms)
attrs = append(attrs, p)
}
sort.Sort(attrs)
for _, attr := range attrs {
buf, err := attr.Serialize()
if err != nil {
return nil, err
}
path.Pattrs = append(path.Pattrs, buf)
}
return path, nil
}
func ParsePath(rf bgp.RouteFamily, args []string) (*table.Path, error) {
var nlri bgp.AddrPrefixInterface
var rd bgp.RouteDistinguisherInterface
var extcomms []string
var err error
attrs := table.PathAttrs(make([]bgp.PathAttributeInterface, 0, 1))
fns := []func([]string) ([]string, bgp.PathAttributeInterface, error){
extractOrigin,
extractMed,
extractLocalPref,
extractCommunity,
extractAigp,
extractAggregator,
extractLargeCommunity,
}
for _, fn := range fns {
var a bgp.PathAttributeInterface
args, a, err = fn(args)
if err != nil {
return nil, err
}
if a != nil {
attrs = append(attrs, a)
}
}
args, nexthop, err := extractNexthop(rf, args)
if err != nil {
return nil, err
}
switch rf {
case bgp.RF_IPv4_UC, bgp.RF_IPv6_UC:
if len(args) < 1 {
return nil, fmt.Errorf("invalid format")
}
ip, net, err := net.ParseCIDR(args[0])
if err != nil {
return nil, err
}
ones, _ := net.Mask.Size()
if rf == bgp.RF_IPv4_UC {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewIPAddrPrefix(uint8(ones), ip.String())
} else {
if ip.To16() == nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewIPv6AddrPrefix(uint8(ones), ip.String())
}
extcomms = args[1:]
case bgp.RF_IPv4_VPN, bgp.RF_IPv6_VPN:
if len(args) < 5 || args[1] != "label" || args[3] != "rd" {
return nil, fmt.Errorf("invalid format")
}
ip, net, _ := net.ParseCIDR(args[0])
ones, _ := net.Mask.Size()
label := 0
if label, err = strconv.Atoi(args[2]); err != nil {
return nil, fmt.Errorf("invalid format")
}
mpls := bgp.NewMPLSLabelStack(uint32(label))
rd, err = bgp.ParseRouteDistinguisher(args[4])
if err != nil {
return nil, err
}
extcomms = args[5:]
if rf == bgp.RF_IPv4_VPN {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewLabeledVPNIPAddrPrefix(uint8(ones), ip.String(), *mpls, rd)
} else {
if ip.To16() == nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewLabeledVPNIPv6AddrPrefix(uint8(ones), ip.String(), *mpls, rd)
}
case bgp.RF_IPv4_MPLS, bgp.RF_IPv6_MPLS:
if len(args) < 2 {
return nil, fmt.Errorf("invalid format")
}
ip, net, _ := net.ParseCIDR(args[0])
ones, _ := net.Mask.Size()
mpls, err := bgp.ParseMPLSLabelStack(args[1])
if err != nil {
return nil, err
}
extcomms = args[2:]
if rf == bgp.RF_IPv4_MPLS {
if ip.To4() == nil {
return nil, fmt.Errorf("invalid ipv4 prefix")
}
nlri = bgp.NewLabeledIPAddrPrefix(uint8(ones), ip.String(), *mpls)
} else {
if ip.To4() != nil {
return nil, fmt.Errorf("invalid ipv6 prefix")
}
nlri = bgp.NewLabeledIPv6AddrPrefix(uint8(ones), ip.String(), *mpls)
}
case bgp.RF_EVPN:
nlri, extcomms, err = ParseEvpnArgs(args)
case bgp.RF_FS_IPv4_VPN, bgp.RF_FS_IPv6_VPN, bgp.RF_FS_L2_VPN:
args, rd, err = extractRouteDistinguisher(args)
if err != nil {
return nil, err
}
fallthrough
case bgp.RF_FS_IPv4_UC, bgp.RF_FS_IPv6_UC:
nlri, extcomms, err = ParseFlowSpecArgs(rf, args, rd)
case bgp.RF_OPAQUE:
m := extractReserved(args, []string{"key", "value"})
if len(m["key"]) != 1 {
return nil, fmt.Errorf("opaque nlri key missing")
}
if len(m["value"]) > 0 {
nlri = bgp.NewOpaqueNLRI([]byte(m["key"][0]), []byte(m["value"][0]))
} else {
nlri = bgp.NewOpaqueNLRI([]byte(m["key"][0]), nil)
}
default:
return nil, fmt.Errorf("Unsupported route family: %s", rf)
}
if err != nil {
return nil, err
}
if rf == bgp.RF_IPv4_UC {
attrs = append(attrs, bgp.NewPathAttributeNextHop(nexthop))
} else {
mpreach := bgp.NewPathAttributeMpReachNLRI(nexthop, []bgp.AddrPrefixInterface{nlri})
attrs = append(attrs, mpreach)
}
if extcomms != nil && len(extcomms) > 0 {
extcomms, err := ParseExtendedCommunities(strings.Join(extcomms, " "))
if err != nil {
return nil, err
}
p := bgp.NewPathAttributeExtendedCommunities(extcomms)
attrs = append(attrs, p)
}
sort.Sort(attrs)
return table.NewPath(nil, nlri, false, attrs, time.Now(), false), nil
}