138 lines
4.1 KiB
Python
138 lines
4.1 KiB
Python
from liteeth.common import *
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from liteeth.generic.depacketizer import LiteEthDepacketizer
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from liteeth.generic.packetizer import LiteEthPacketizer
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class LiteEthICMPDepacketizer(LiteEthDepacketizer):
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def __init__(self):
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LiteEthDepacketizer.__init__(self,
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eth_ipv4_user_description(8),
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eth_icmp_description(8),
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icmp_header,
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icmp_header_len)
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class LiteEthICMPPacketizer(LiteEthPacketizer):
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def __init__(self):
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LiteEthPacketizer.__init__(self,
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eth_icmp_description(8),
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eth_ipv4_user_description(8),
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icmp_header,
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icmp_header_len)
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class LiteEthICMPTX(Module):
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def __init__(self, ip_address):
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self.sink = sink = Sink(eth_icmp_user_description(8))
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self.source = source = Source(eth_ipv4_user_description(8))
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###
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self.submodules.packetizer = packetizer = LiteEthICMPPacketizer()
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self.comb += [
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packetizer.sink.stb.eq(sink.stb),
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packetizer.sink.sop.eq(sink.sop),
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packetizer.sink.eop.eq(sink.eop),
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sink.ack.eq(packetizer.sink.ack),
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packetizer.sink.msgtype.eq(sink.msgtype),
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packetizer.sink.code.eq(sink.code),
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packetizer.sink.checksum.eq(sink.checksum),
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packetizer.sink.quench.eq(sink.quench),
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packetizer.sink.data.eq(sink.data)
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]
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self.submodules.fsm = fsm = FSM(reset_state="IDLE")
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fsm.act("IDLE",
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packetizer.source.ack.eq(1),
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If(packetizer.source.stb & packetizer.source.sop,
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packetizer.source.ack.eq(0),
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NextState("SEND")
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)
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)
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fsm.act("SEND",
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Record.connect(packetizer.source, source),
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source.length.eq(sink.length + icmp_header_len),
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source.protocol.eq(icmp_protocol),
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source.ip_address.eq(sink.ip_address),
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If(source.stb & source.eop & source.ack,
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NextState("IDLE")
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)
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)
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class LiteEthICMPRX(Module):
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def __init__(self, ip_address):
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self.sink = sink = Sink(eth_ipv4_user_description(8))
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self.source = source = Source(eth_icmp_user_description(8))
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###
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self.submodules.depacketizer = depacketizer = LiteEthICMPDepacketizer()
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self.comb += Record.connect(sink, depacketizer.sink)
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self.submodules.fsm = fsm = FSM(reset_state="IDLE")
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fsm.act("IDLE",
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depacketizer.source.ack.eq(1),
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If(depacketizer.source.stb & depacketizer.source.sop,
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depacketizer.source.ack.eq(0),
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NextState("CHECK")
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)
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)
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valid = Signal()
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self.sync += valid.eq(
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depacketizer.source.stb &
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(sink.protocol == icmp_protocol)
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)
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fsm.act("CHECK",
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If(valid,
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NextState("PRESENT")
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).Else(
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NextState("DROP")
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)
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)
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self.comb += [
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source.sop.eq(depacketizer.source.sop),
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source.eop.eq(depacketizer.source.eop),
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source.msgtype.eq(depacketizer.source.msgtype),
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source.code.eq(depacketizer.source.code),
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source.checksum.eq(depacketizer.source.checksum),
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source.quench.eq(depacketizer.source.quench),
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source.ip_address.eq(sink.ip_address),
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source.length.eq(sink.length - icmp_header_len),
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source.data.eq(depacketizer.source.data),
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source.error.eq(depacketizer.source.error)
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]
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fsm.act("PRESENT",
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source.stb.eq(depacketizer.source.stb),
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depacketizer.source.ack.eq(source.ack),
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If(source.stb & source.eop & source.ack,
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NextState("IDLE")
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)
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)
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fsm.act("DROP",
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depacketizer.source.ack.eq(1),
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If(depacketizer.source.stb & depacketizer.source.eop & depacketizer.source.ack,
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NextState("IDLE")
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)
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)
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class LiteEthICMPEcho(Module):
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def __init__(self):
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self.sink = sink = Sink(eth_icmp_user_description(8))
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self.source = source = Source(eth_icmp_user_description(8))
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###
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self.submodules.buffer = PacketBuffer(eth_icmp_user_description(8), 128, 2)
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self.comb += [
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Record.connect(sink, self.buffer.sink),
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Record.connect(self.buffer.source, source),
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self.source.msgtype.eq(0x0),
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self.source.checksum.eq(~((~self.buffer.source.checksum)-0x0800))
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]
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class LiteEthICMP(Module):
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def __init__(self, ip, ip_address):
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self.submodules.tx = tx = LiteEthICMPTX(ip_address)
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self.submodules.rx = rx = LiteEthICMPRX(ip_address)
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self.submodules.echo = echo = LiteEthICMPEcho()
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self.comb += [
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Record.connect(rx.source, echo.sink),
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Record.connect(echo.source, tx.sink)
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]
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ip_port = ip.crossbar.get_port(icmp_protocol)
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self.comb += [
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Record.connect(tx.source, ip_port.sink),
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Record.connect(ip_port.source, rx.sink)
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]
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