127 lines
3.5 KiB
Python
127 lines
3.5 KiB
Python
# This file is Copyright (c) 2015-2017 Florent Kermarrec <florent@enjoy-digital.fr>
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# License: BSD
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import math
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from litex.soc.interconnect.stream_sim import *
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from liteeth.common import *
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from test.model import ip
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def print_udp(s):
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print_with_prefix(s, "[UDP]")
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# UDP model
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class UDPPacket(Packet):
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def __init__(self, init=[]):
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Packet.__init__(self, init)
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def decode(self):
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header = []
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for byte in self[:udp_header.length]:
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header.append(self.pop(0))
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for k, v in sorted(udp_header.fields.items()):
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setattr(self, k, get_field_data(v, header))
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def encode(self):
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header = 0
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for k, v in sorted(udp_header.fields.items()):
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value = merge_bytes(split_bytes(getattr(self, k),
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math.ceil(v.width/8)),
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"little")
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header += (value << v.offset+(v.byte*8))
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for d in split_bytes(header, udp_header.length):
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self.insert(0, d)
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def __repr__(self):
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r = "--------\n"
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for k in sorted(udp_header.fields.keys()):
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r += k + " : 0x{:0x}\n".format(getattr(self, k))
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r += "payload: "
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for d in self:
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r += "{:02x}".format(d)
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return r
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class UDP(Module):
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def __init__(self, ip, ip_address, debug=False, loopback=False):
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self.ip = ip
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self.ip_address = ip_address
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self.debug = debug
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self.loopback = loopback
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self.tx_packets = []
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self.tx_packet = UDPPacket()
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self.rx_packet = UDPPacket()
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self.etherbone_callback = None
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self.ip.set_udp_callback(self.callback)
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def set_etherbone_callback(self, callback):
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self.etherbone_callback = callback
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def send(self, packet):
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packet.encode()
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if self.debug:
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print_udp(">>>>>>>>")
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print_udp(packet)
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ip_packet = ip.IPPacket(packet)
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ip_packet.version = 0x4
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ip_packet.ihl = 0x5
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ip_packet.total_length = len(packet) + ip_packet.ihl
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ip_packet.identification = 0
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ip_packet.flags = 0
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ip_packet.fragment_offset = 0
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ip_packet.ttl = 0x80
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ip_packet.sender_ip = self.ip_address
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ip_packet.target_ip = 0x12345678 # XXX
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ip_packet.checksum = 0
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ip_packet.protocol = udp_protocol
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self.ip.send(ip_packet)
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def callback(self, packet):
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packet = UDPPacket(packet)
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packet.decode()
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if self.debug:
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print_udp("<<<<<<<<")
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print_udp(packet)
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if self.loopback:
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self.send(packet)
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else:
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self.process(packet)
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def process(self, packet):
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if packet.dst_port == 20000:
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if self.etherbone_callback is not None:
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self.etherbone_callback(packet)
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if __name__ == "__main__":
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from test.model.dumps import *
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from test.model.mac import *
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from test.model.ip import *
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errors = 0
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# UDP packet
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packet = MACPacket(udp)
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packet.decode_remove_header()
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# print(packet)
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packet = IPPacket(packet)
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packet.decode()
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# print(packet)
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packet = UDPPacket(packet)
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packet.decode()
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# print(packet)
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if packet.length != (len(packet)+udp_header.length):
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errors += 1
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errors += verify_packet(packet, udp_infos)
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packet.encode()
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packet.decode()
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# print(packet)
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if packet.length != (len(packet)+udp_header.length):
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errors += 1
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errors += verify_packet(packet, udp_infos)
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print("udp errors " + str(errors))
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