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1.support INT MX/MD mode. 2.support INT over IPv4/IPv6+TCP/UDP/VXLAN/GRE/GENEVE. 3.add 28 testcases for INT.
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# scapy.contrib.description = Inband Network Telemetry Protocol (INT) | ||
# scapy.contrib.status = loads | ||
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''' | ||
Inband Network Telemetry Protocol (INT) | ||
References: | ||
https://staging.p4.org/p4-spec/docs/INT_v2_1.pdf | ||
https://staging.p4.org/p4-spec/docs/telemetry_report_v2_0.pdf | ||
https://github.com/p4lang/p4-applications | ||
Example Packet Formate: | ||
INT-MX mode: | ||
INToGre = Ether/IP/GRE/INTShimGre/INTMetaMx/Raw | ||
INToTCP = Ether/IP/TCP/INTShimTcpUdp/INTMetaMx/Raw | ||
INToUDP = Ether/IP/UDP/INTShimTcpUdp/INTMetaMx/Raw | ||
INToVXLAN = Ether/IP/UDP/VXLAN/INTShimVxlan/INTMetaMx/Raw | ||
INToGENEVE = Ether/IP/UDP/GENEVE/GeneveOptINT/INTMetaMx/Raw | ||
INT-MD mode: | ||
INToGre = Ether/IP/GRE/INTShimGre/INTMetaMd/INTMetaHop/Raw | ||
INToTCP = Ether/IP/TCP/INTShimTcpUdp/INTMetaMd/INTMetaHop/Raw | ||
INToUDP = Ether/IP/UDP/INTShimTcpUdp/INTMetaMd/INTMetaHop/Raw | ||
INToVXLAN = Ether/IP/UDP/VXLAN/INTShimVxlan/INTMetaMd/INTMetaHop/Raw | ||
INToGENEVE = Ether/IP/UDP/GENEVE/GeneveOptINT/INTMetaMd/INTMetaHop/Raw | ||
''' | ||
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import struct | ||
import socket | ||
from scapy.packet import Packet, bind_layers | ||
from scapy.fields import BitField, BitEnumField, FlagsField, ByteField, \ | ||
ShortField, IntField, LongField, FieldLenField, ConditionalField, \ | ||
MultipleTypeField, PacketField, PacketListField | ||
from scapy.layers.l2 import GRE | ||
from scapy.layers.inet import IP, TCP, UDP | ||
from scapy.layers.vxlan import VXLAN | ||
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INT_PRI_MASK = 0x80 | ||
INT_L4_DPORT = 0x4568 | ||
INT_GRE_PROTOCOL = 0x4569 | ||
INT_VXLAN_PROTOCOL = 0x82 | ||
INT_GENEVE_CLASSID = 0x0103 | ||
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_INT_TYPE = { | ||
1: 'INT-MD', | ||
2: 'INT-DST', | ||
3: 'INT-MX', | ||
} | ||
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_INT_GRE = { | ||
0: 'Original packet with GRE', | ||
1: 'Original packet without GRE', | ||
} | ||
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_INT_GPE = { | ||
0: 'Original packet used VXLAN GPE encapsulation', | ||
1: 'Original packet used VXLAN encapsulation', | ||
} | ||
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_INT_INSTR_BITMAP = [ | ||
'checksum', | ||
'reserved14', | ||
'reserved13', | ||
'reserved12', | ||
'reserved11', | ||
'reserved10', | ||
'reserved9', | ||
'buf_info', | ||
'tx_info', | ||
'l2_intf', | ||
'egr_ts', | ||
'igr_ts', | ||
'que_info', | ||
'latency', | ||
'l1_intf', | ||
'node_id', | ||
] | ||
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class INTMetaHop(Packet): | ||
name = 'INTMetaHop' | ||
fields_desc = [ | ||
ConditionalField( | ||
IntField('node_id', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 0)) | ||
), | ||
ConditionalField( | ||
ShortField('igr_l1_intf', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 1)) | ||
), | ||
ConditionalField( | ||
ShortField('egr_l1_intf', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 1)) | ||
), | ||
ConditionalField( | ||
IntField('latency', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 2)) | ||
), | ||
ConditionalField( | ||
BitField('que_id', 0, 8), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 3)) | ||
), | ||
ConditionalField( | ||
BitField('que_occupy', 0, 24), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 3)) | ||
), | ||
ConditionalField( | ||
LongField('igr_ts', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 4)) | ||
), | ||
ConditionalField( | ||
LongField('egr_ts', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 5)) | ||
), | ||
ConditionalField( | ||
IntField('igr_l2_intf', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 6)) | ||
), | ||
ConditionalField( | ||
IntField('egr_l2_intf', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 6)) | ||
), | ||
ConditionalField( | ||
IntField('egr_tx_info', 0), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 7)) | ||
), | ||
ConditionalField( | ||
BitField('buf_id', 0, 8), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 8)) | ||
), | ||
ConditionalField( | ||
BitField('buf_occupy', 0, 24), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 8)) | ||
), | ||
ConditionalField( | ||
IntField('reserved9', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 9)) | ||
), | ||
ConditionalField( | ||
IntField('reserved10', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 10)) | ||
), | ||
ConditionalField( | ||
IntField('reserved11', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 11)) | ||
), | ||
ConditionalField( | ||
IntField('reserved12', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 12)) | ||
), | ||
ConditionalField( | ||
IntField('reserved13', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 13)) | ||
), | ||
ConditionalField( | ||
IntField('reserved14', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 14)) | ||
), | ||
ConditionalField( | ||
IntField('checksum', 0xffffffff), | ||
lambda pkt:pkt.parent.instr_bitmap & (0x1 << (15 - 15)) | ||
), | ||
] | ||
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def extract_padding(self, s): | ||
return "", s | ||
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class INTMetaMx(Packet): | ||
name = 'INTMetaMx' | ||
fields_desc = [ | ||
BitField('version', 0, 4), | ||
BitField('discard', 0, 1), | ||
BitField('reserved1', 0, 27), | ||
FlagsField('instr_bitmap', 0xfe00, 16, _INT_INSTR_BITMAP), | ||
ShortField('ds_id', 0), | ||
ShortField('ds_instr', 0), | ||
ShortField('ds_flags', 0), | ||
] | ||
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def extract_padding(self, s): | ||
return "", s | ||
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class INTMetaMd(Packet): | ||
name = 'INTMetaMd' | ||
fields_desc = [ | ||
BitField('version', 0, 4), | ||
BitField('discard', 0, 1), | ||
BitField('exceed_mht', 0, 1), | ||
BitField('exceed_mtu', 0, 1), | ||
BitField('reserved0', 0, 12), | ||
BitField('hop_len', 0, 5), | ||
BitField('hop_left', 0, 8), | ||
FlagsField('instr_bitmap', 0xfe00, 16, _INT_INSTR_BITMAP), | ||
ShortField('ds_id', 0), | ||
ShortField('ds_instr', 0), | ||
ShortField('ds_flags', 0), | ||
PacketListField('meta_hops', [], INTMetaHop, | ||
length_from=lambda pkt: pkt.parent.length * 4 - 12), | ||
] | ||
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def post_build(self, pkt, pay): | ||
if self.meta_hops != None: | ||
tmp_len = len(self.meta_hops[0]) // 4 | ||
old_value = struct.unpack("B", pkt[2:3])[0] | ||
new_value = (old_value & 0b11100000) | (tmp_len & 0b00011111) | ||
pkt = pkt[:2] + struct.pack("B", new_value) + pkt[3:] | ||
return pkt + pay | ||
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def extract_padding(self, s): | ||
return "", s | ||
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class INTShimTcpUdp(Packet): | ||
name = 'INTShimTcpUdp' | ||
fields_desc = [ | ||
BitEnumField('type', 1, 4, _INT_TYPE), | ||
BitField('npt', 0, 2), | ||
BitField('reserved1', 0, 2), | ||
FieldLenField('length', None, length_of="metadata", adjust=lambda pkt, x: x // 4, fmt="B"), | ||
ConditionalField(ByteField('reserved3', 0), lambda pkt: pkt.npt == 0), | ||
ConditionalField(BitField('dscp', 0, 6), lambda pkt: pkt.npt == 0), | ||
ConditionalField(BitField('reserved4', 0, 2), lambda pkt: pkt.npt == 0), | ||
ConditionalField(ShortField('l4_dport', 0), lambda pkt: pkt.npt == 1), | ||
ConditionalField(ByteField('ip_proto', 0), lambda pkt: pkt.npt == 2), | ||
ConditionalField(ByteField('reserved5', 0), lambda pkt: pkt.npt == 2), | ||
MultipleTypeField([ | ||
(PacketField('metadata', None, INTMetaMd), lambda pkt: pkt.type == 1), | ||
(PacketField('metadata', None, INTMetaMx), lambda pkt: pkt.type == 3),], | ||
PacketField('metadata', None, INTMetaMd) | ||
), | ||
] | ||
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class INTShimGre(Packet): | ||
name = 'INTShimGre' | ||
fields_desc = [ | ||
BitEnumField('type', 1, 4, _INT_TYPE), | ||
BitEnumField('gre', 0, 1, _INT_GRE), | ||
BitField('reserved0', 0, 3), | ||
FieldLenField('length', None, length_of="metadata", adjust=lambda pkt, x: x // 4, fmt="B"), | ||
ShortField('gre_proto', 0), | ||
MultipleTypeField([ | ||
(PacketField('metadata', None, INTMetaMd), lambda pkt: pkt.type == 1), | ||
(PacketField('metadata', None, INTMetaMx), lambda pkt: pkt.type == 3),], | ||
PacketField('metadata', None, INTMetaMd) | ||
), | ||
] | ||
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class INTShimVxlan(Packet): | ||
name = 'INTShimVxlan' | ||
fields_desc = [ | ||
BitEnumField('type', 1, 4, _INT_TYPE), | ||
BitField('reserved2', 0, 4), | ||
FieldLenField('length', None, length_of="metadata", adjust=lambda pkt, x: x // 4, fmt="B"), | ||
BitEnumField('gpe', 0, 1, _INT_GPE), | ||
BitField('reserved6', 0, 7), | ||
ByteField('vxlan_proto', 0), | ||
MultipleTypeField([ | ||
(PacketField('metadata', None, INTMetaMd), lambda pkt: pkt.type == 1), | ||
(PacketField('metadata', None, INTMetaMx), lambda pkt: pkt.type == 3),], | ||
PacketField('metadata', None, INTMetaMd) | ||
), | ||
] | ||
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bind_layers(UDP, INTShimTcpUdp, dport=INT_L4_DPORT) | ||
bind_layers(TCP, INTShimTcpUdp, dport=INT_L4_DPORT) | ||
bind_layers(GRE, INTShimGre, proto=INT_GRE_PROTOCOL) | ||
bind_layers(VXLAN, INTShimVxlan, NextProtocol=INT_VXLAN_PROTOCOL) |
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