205 lines
6.3 KiB
Python
205 lines
6.3 KiB
Python
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# This file is part of Scapy
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# See http://www.secdev.org/projects/scapy for more information
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# Copyright (C) Haggai Eran <haggai.eran@gmail.com>
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# This program is published under a GPLv2 license
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# scapy.contrib.description = RoCE v2
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# scapy.contrib.status = loads
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"""
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RoCE: RDMA over Converged Ethernet
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"""
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from scapy.packet import Packet, bind_layers, Raw
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from scapy.fields import ByteEnumField, XShortField, \
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XLongField, BitField, FCSField
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from scapy.layers.inet import IP, UDP
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from scapy.compat import raw
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from scapy.error import warning
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from zlib import crc32
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import struct
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_transports = {
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'RC': 0x00,
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'UC': 0x20,
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'RD': 0x40,
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'UD': 0x60,
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}
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_ops = {
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'SEND_FIRST': 0x00,
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'SEND_MIDDLE': 0x01,
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'SEND_LAST': 0x02,
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'SEND_LAST_WITH_IMMEDIATE': 0x03,
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'SEND_ONLY': 0x04,
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'SEND_ONLY_WITH_IMMEDIATE': 0x05,
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'RDMA_WRITE_FIRST': 0x06,
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'RDMA_WRITE_MIDDLE': 0x07,
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'RDMA_WRITE_LAST': 0x08,
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'RDMA_WRITE_LAST_WITH_IMMEDIATE': 0x09,
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'RDMA_WRITE_ONLY': 0x0a,
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'RDMA_WRITE_ONLY_WITH_IMMEDIATE': 0x0b,
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'RDMA_READ_REQUEST': 0x0c,
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'RDMA_READ_RESPONSE_FIRST': 0x0d,
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'RDMA_READ_RESPONSE_MIDDLE': 0x0e,
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'RDMA_READ_RESPONSE_LAST': 0x0f,
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'RDMA_READ_RESPONSE_ONLY': 0x10,
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'ACKNOWLEDGE': 0x11,
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'ATOMIC_ACKNOWLEDGE': 0x12,
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'COMPARE_SWAP': 0x13,
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'FETCH_ADD': 0x14,
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}
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CNP_OPCODE = 0x81
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def opcode(transport, op):
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return (_transports[transport] + _ops[op], '{}_{}'.format(transport, op))
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_bth_opcodes = dict([
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opcode('RC', 'SEND_FIRST'),
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opcode('RC', 'SEND_MIDDLE'),
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opcode('RC', 'SEND_LAST'),
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opcode('RC', 'SEND_LAST_WITH_IMMEDIATE'),
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opcode('RC', 'SEND_ONLY'),
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opcode('RC', 'SEND_ONLY_WITH_IMMEDIATE'),
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opcode('RC', 'RDMA_WRITE_FIRST'),
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opcode('RC', 'RDMA_WRITE_MIDDLE'),
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opcode('RC', 'RDMA_WRITE_LAST'),
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opcode('RC', 'RDMA_WRITE_LAST_WITH_IMMEDIATE'),
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opcode('RC', 'RDMA_WRITE_ONLY'),
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opcode('RC', 'RDMA_WRITE_ONLY_WITH_IMMEDIATE'),
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opcode('RC', 'RDMA_READ_REQUEST'),
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opcode('RC', 'RDMA_READ_RESPONSE_FIRST'),
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opcode('RC', 'RDMA_READ_RESPONSE_MIDDLE'),
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opcode('RC', 'RDMA_READ_RESPONSE_LAST'),
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opcode('RC', 'RDMA_READ_RESPONSE_ONLY'),
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opcode('RC', 'ACKNOWLEDGE'),
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opcode('RC', 'ATOMIC_ACKNOWLEDGE'),
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opcode('RC', 'COMPARE_SWAP'),
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opcode('RC', 'FETCH_ADD'),
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opcode('UC', 'SEND_FIRST'),
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opcode('UC', 'SEND_MIDDLE'),
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opcode('UC', 'SEND_LAST'),
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opcode('UC', 'SEND_LAST_WITH_IMMEDIATE'),
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opcode('UC', 'SEND_ONLY'),
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opcode('UC', 'SEND_ONLY_WITH_IMMEDIATE'),
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opcode('UC', 'RDMA_WRITE_FIRST'),
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opcode('UC', 'RDMA_WRITE_MIDDLE'),
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opcode('UC', 'RDMA_WRITE_LAST'),
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opcode('UC', 'RDMA_WRITE_LAST_WITH_IMMEDIATE'),
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opcode('UC', 'RDMA_WRITE_ONLY'),
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opcode('UC', 'RDMA_WRITE_ONLY_WITH_IMMEDIATE'),
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opcode('RD', 'SEND_FIRST'),
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opcode('RD', 'SEND_MIDDLE'),
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opcode('RD', 'SEND_LAST'),
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opcode('RD', 'SEND_LAST_WITH_IMMEDIATE'),
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opcode('RD', 'SEND_ONLY'),
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opcode('RD', 'SEND_ONLY_WITH_IMMEDIATE'),
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opcode('RD', 'RDMA_WRITE_FIRST'),
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opcode('RD', 'RDMA_WRITE_MIDDLE'),
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opcode('RD', 'RDMA_WRITE_LAST'),
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opcode('RD', 'RDMA_WRITE_LAST_WITH_IMMEDIATE'),
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opcode('RD', 'RDMA_WRITE_ONLY'),
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opcode('RD', 'RDMA_WRITE_ONLY_WITH_IMMEDIATE'),
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opcode('RD', 'RDMA_READ_REQUEST'),
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opcode('RD', 'RDMA_READ_RESPONSE_FIRST'),
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opcode('RD', 'RDMA_READ_RESPONSE_MIDDLE'),
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opcode('RD', 'RDMA_READ_RESPONSE_LAST'),
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opcode('RD', 'RDMA_READ_RESPONSE_ONLY'),
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opcode('RD', 'ACKNOWLEDGE'),
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opcode('RD', 'ATOMIC_ACKNOWLEDGE'),
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opcode('RD', 'COMPARE_SWAP'),
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opcode('RD', 'FETCH_ADD'),
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opcode('UD', 'SEND_ONLY'),
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opcode('UD', 'SEND_ONLY_WITH_IMMEDIATE'),
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(CNP_OPCODE, 'CNP'),
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])
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class BTH(Packet):
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name = "BTH"
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fields_desc = [
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ByteEnumField("opcode", 0, _bth_opcodes),
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BitField("solicited", 0, 1),
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BitField("migreq", 0, 1),
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BitField("padcount", 0, 2),
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BitField("version", 0, 4),
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XShortField("pkey", 0xffff),
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BitField("fecn", 0, 1),
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BitField("becn", 0, 1),
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BitField("resv6", 0, 6),
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BitField("dqpn", 0, 24),
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BitField("ackreq", 0, 1),
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BitField("resv7", 0, 7),
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BitField("psn", 0, 24),
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FCSField("icrc", None, fmt="!I")]
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@staticmethod
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def pack_icrc(icrc):
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return struct.pack("!I", icrc & 0xffffffff)[::-1]
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def compute_icrc(self, p):
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udp = self.underlayer
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if udp is None or not isinstance(udp, UDP):
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warning("Expecting UDP underlayer to compute checksum. Got %s.",
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udp and udp.name)
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return self.pack_icrc(0)
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ip = udp.underlayer
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if isinstance(ip, IP):
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# pseudo-LRH / IP / UDP / BTH / payload
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pshdr = Raw(b'\xff' * 8) / ip.copy()
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pshdr.chksum = 0xffff
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pshdr.ttl = 0xff
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pshdr.tos = 0xff
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pshdr[UDP].chksum = 0xffff
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pshdr[BTH].fecn = 1
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pshdr[BTH].becn = 1
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pshdr[BTH].resv6 = 0xff
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bth = pshdr[BTH].self_build()
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payload = raw(pshdr[BTH].payload)
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# add ICRC placeholder just to get the right IP.totlen and
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# UDP.length
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icrc_placeholder = b'\xff\xff\xff\xff'
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pshdr[UDP].payload = Raw(bth + payload + icrc_placeholder)
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icrc = crc32(raw(pshdr)[:-4]) & 0xffffffff
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return self.pack_icrc(icrc)
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else:
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# TODO support IPv6
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warning("The underlayer protocol %s is not supported.",
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ip and ip.name)
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return self.pack_icrc(0)
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# RoCE packets end with ICRC - a 32-bit CRC of the packet payload and
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# pseudo-header. Add the ICRC header if it is missing and calculate its
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# value.
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def post_build(self, p, pay):
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p += pay
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if self.icrc is None:
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p = p[:-4] + self.compute_icrc(p)
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return p
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class CNPPadding(Packet):
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name = "CNPPadding"
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fields_desc = [
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XLongField("reserved1", 0),
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XLongField("reserved2", 0),
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]
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def cnp(dqpn):
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return BTH(opcode=CNP_OPCODE, becn=1, dqpn=dqpn) / CNPPadding()
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bind_layers(BTH, CNPPadding, opcode=CNP_OPCODE)
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bind_layers(UDP, BTH, dport=4791)
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