Exa-Networks /
exabgp
| @@ 26-63 (lines=38) @@ | ||
| 23 | # 3.1. Label-Index TLV |
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| 24 | ||
| 25 | ||
| 26 | @PrefixSid.register() |
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| 27 | class SrLabelIndex(object): |
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| 28 | TLV = 1 |
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| 29 | LENGTH = 7 |
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| 30 | ||
| 31 | def __init__ (self, labelindex, packed=None): |
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| 32 | self.labelindex = labelindex |
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| 33 | self.packed = self.pack() |
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| 34 | ||
| 35 | def __repr__ (self): |
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| 36 | return "%s" % (self.labelindex) |
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| 37 | ||
| 38 | def pack (self): |
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| 39 | return concat_bytes( |
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| 40 | pack('!B', self.TLV), |
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| 41 | pack('!H', self.LENGTH), |
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| 42 | pack('!B',0), # reserved |
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| 43 | pack('!H',0), # flags |
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| 44 | pack('!I',self.labelindex) |
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| 45 | ) |
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| 46 | ||
| 47 | @classmethod |
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| 48 | def unpack (cls,data,length): |
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| 49 | labelindex = -1 |
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| 50 | if cls.LENGTH != length: |
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| 51 | raise Notify(3,5, "Invalid TLV size. Should be 7 but {0} received".format(length)) |
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| 52 | # Shift reserved bits |
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| 53 | data = data[1:] |
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| 54 | # Shift Flags |
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| 55 | # Flags: 16 bits of flags. None is defined by this document. The |
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| 56 | # flag field MUST be clear on transmission and MUST be ignored at |
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| 57 | # reception. |
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| 58 | data = data[2:6] |
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| 59 | labelindex = unpack('!I',data)[0] |
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| 60 | return cls(labelindex=labelindex,packed=data) |
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| 61 | ||
| 62 | def json (self,compact=None): |
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| 63 | return '"sr-label-index": %d' % (self.labelindex) |
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| 64 | ||
| @@ 32-65 (lines=34) @@ | ||
| 29 | # 3.2. IPv6 SID |
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| 30 | ||
| 31 | ||
| 32 | @PrefixSid.register() |
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| 33 | class SrV6Sid(object): |
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| 34 | TLV = 2 |
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| 35 | LENGTH = 19 |
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| 36 | ||
| 37 | def __init__ (self,v6sid,packed=None): |
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| 38 | self.v6sid = v6sid |
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| 39 | self.packed = self.pack() |
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| 40 | ||
| 41 | def __repr__ (self): |
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| 42 | return "sr-v6-sid %s" % (self.v6sid) |
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| 43 | ||
| 44 | def pack (self): |
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| 45 | return concat_bytes( |
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| 46 | pack('!B', self.TLV), |
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| 47 | pack('!H', self.LENGTH), |
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| 48 | pack('!B', 0), |
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| 49 | pack('!H', 0), |
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| 50 | IP.pton(self.v6sid) |
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| 51 | ) |
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| 52 | ||
| 53 | @classmethod |
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| 54 | def unpack (cls,data,length): |
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| 55 | v6sid = -1 |
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| 56 | if cls.LENGTH != length: |
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| 57 | raise Notify(3,5, "Invalid TLV size. Should be {0} but {1} received".format(cls.LENGTH, length)) |
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| 58 | # RESERVED: 24 bit field for future use. MUST be clear on |
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| 59 | # transmission an MUST be ignored at reception. |
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| 60 | data = data[3:19] |
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| 61 | v6sid = IP.unpack(data) |
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| 62 | return cls(v6sid=str(v6sid),packed=data) |
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| 63 | ||
| 64 | def json (self, compact=None): |
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| 65 | return '"sr-v6-sid": "%s"' % (self.v6sid) |
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| 66 | ||
| @@ 32-64 (lines=33) @@ | ||
| 29 | # 3.2. SRv6 VPN SID |
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| 30 | ||
| 31 | ||
| 32 | @PrefixSid.register() |
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| 33 | class Srv6VpnSid(object): |
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| 34 | TLV = 4 |
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| 35 | LENGTH = 19 |
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| 36 | ||
| 37 | def __init__ (self,vpnsid,packed=None): |
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| 38 | self.vpnsid = vpnsid |
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| 39 | self.packed = self.pack() |
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| 40 | ||
| 41 | def __repr__ (self): |
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| 42 | return "srv6-vpn-sid %s" % (self.vpnsid) |
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| 43 | ||
| 44 | def pack (self): |
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| 45 | return concat_bytes( |
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| 46 | pack('!B', self.TLV), |
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| 47 | pack('!H', self.LENGTH), |
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| 48 | pack('!B', 0), |
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| 49 | pack('!B', 0), |
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| 50 | pack('!B', 0), |
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| 51 | IP.pton(self.vpnsid) |
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| 52 | ) |
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| 53 | ||
| 54 | @classmethod |
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| 55 | def unpack (cls,data,length): |
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| 56 | vpnsid = -1 |
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| 57 | if cls.LENGTH != length: |
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| 58 | raise Notify(3,5, "Invalid TLV size. Should be {0} but {1} received".format(cls.LENGTH, length)) |
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| 59 | data = data[3:19] |
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| 60 | vpnsid = IP.unpack(data) |
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| 61 | return cls(vpnsid=str(vpnsid),packed=data) |
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| 62 | ||
| 63 | def json (self, compact=None): |
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| 64 | return '"srv6-vpn-sid": "%s"' % (self.vpnsid) |
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| 65 | ||
