예제 #1
0
파일: path.go 프로젝트: mfeed/gobgp
func (path *Path) SetExtCommunities(exts []bgp.ExtendedCommunityInterface, doReplace bool) {
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES)
	if attr != nil {
		l := attr.(*bgp.PathAttributeExtendedCommunities).Value
		if doReplace {
			l = exts
		} else {
			l = append(l, exts...)
		}
		path.setPathAttr(bgp.NewPathAttributeExtendedCommunities(l))
	} else {
		path.setPathAttr(bgp.NewPathAttributeExtendedCommunities(exts))
	}
}
예제 #2
0
파일: global.go 프로젝트: mfeed/gobgp
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
}
예제 #3
0
func (s *Server) api2PathList(resource Resource, ApiPathList []*Path) ([]*table.Path, error) {
	var nlri bgp.AddrPrefixInterface
	var nexthop string
	var pi *table.PeerInfo

	pathList := make([]*table.Path, 0, len(ApiPathList))
	for _, path := range ApiPathList {
		seen := make(map[bgp.BGPAttrType]bool)

		pattr := make([]bgp.PathAttributeInterface, 0)
		extcomms := make([]bgp.ExtendedCommunityInterface, 0)

		if path.SourceAsn != 0 {
			pi = &table.PeerInfo{
				AS:      path.SourceAsn,
				LocalID: net.ParseIP(path.SourceId),
			}
		}

		if len(path.Nlri) > 0 {
			nlri = &bgp.IPAddrPrefix{}
			err := nlri.DecodeFromBytes(path.Nlri)
			if err != nil {
				return nil, err
			}
		}

		for _, attr := range path.Pattrs {
			p, err := bgp.GetPathAttribute(attr)
			if err != nil {
				return nil, err
			}

			err = p.DecodeFromBytes(attr)
			if err != nil {
				return nil, err
			}

			if _, ok := seen[p.GetType()]; !ok {
				seen[p.GetType()] = true
			} else {
				return nil, fmt.Errorf("the path attribute apears twice. Type : " + strconv.Itoa(int(p.GetType())))
			}
			switch p.GetType() {
			case bgp.BGP_ATTR_TYPE_NEXT_HOP:
				nexthop = p.(*bgp.PathAttributeNextHop).Value.String()
			case bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES:
				value := p.(*bgp.PathAttributeExtendedCommunities).Value
				if len(value) > 0 {
					extcomms = append(extcomms, value...)
				}
			case bgp.BGP_ATTR_TYPE_MP_REACH_NLRI:
				mpreach := p.(*bgp.PathAttributeMpReachNLRI)
				if len(mpreach.Value) != 1 {
					return nil, fmt.Errorf("include only one route in mp_reach_nlri")
				}
				nlri = mpreach.Value[0]
				nexthop = mpreach.Nexthop.String()
			default:
				pattr = append(pattr, p)
			}
		}

		if nlri == nil || nexthop == "" {
			return nil, fmt.Errorf("not found nlri or nexthop")
		}

		rf := bgp.AfiSafiToRouteFamily(nlri.AFI(), nlri.SAFI())

		if resource != Resource_VRF && rf == bgp.RF_IPv4_UC {
			pattr = append(pattr, bgp.NewPathAttributeNextHop(nexthop))
		} else {
			pattr = append(pattr, bgp.NewPathAttributeMpReachNLRI(nexthop, []bgp.AddrPrefixInterface{nlri}))
		}

		if len(extcomms) > 0 {
			pattr = append(pattr, bgp.NewPathAttributeExtendedCommunities(extcomms))
		}
		newPath := table.NewPath(pi, nlri, path.IsWithdraw, pattr, time.Now(), path.NoImplicitWithdraw)
		newPath.SetIsFromExternal(path.IsFromExternal)
		pathList = append(pathList, newPath)
	}
	return pathList, nil
}
예제 #4
0
파일: global.go 프로젝트: osrg/gobgp
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
}