add ip model skeleton

liteeth/test/Makefile

@@ -6,6 +6,7 @@ CMD = PYTHONPATH=$(LEDIR) $(PYTHON)
 model_tb:
 	$(CMD) ./model/mac.py
 	$(CMD) ./model/arp.py
+	$(CMD) ./model/ip.py
 
 mac_core_tb:
 	$(CMD) mac_core_tb.py

liteeth/test/model/dumps.py

@@ -48,24 +48,6 @@ arp_reply_infos = {
 	"destination_ip_address"	:	0xa9feff42
 }
 
-ping_request = format_dump("""
-ff 03 00 21 45 00 00 64 00 00 00 00 ff 01 a7 96
-0a 00 00 01 0a 00 00 02 08 00 d6 7f 00 00 00 00
-00 00 00 00 00 02 a7 c8 ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd""")
-
-icmp_echo = format_dump("""
-ff 03 00 21 45 00 00 64 00 00 00 00 ff 01 a7 96
-0a 00 00 02 0a 00 00 01 00 00 de 7f 00 00 00 00
-00 00 00 00 00 02 a7 c8 ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd ab cd ab cd ab cd ab cd
-ab cd ab cd ab cd ab cd""")
-
 udp = format_dump("""
 d0 7a b5 96 cd 0a 00 14 0b 33 33 27 08 00 45 00
 00 5f 31 16 00 00 80 11 87 77 c0 a8 01 65 b2 7b
@@ -74,3 +56,11 @@ d0 7a b5 96 cd 0a 00 14 0b 33 33 27 08 00 45 00
 aa 9b 4e 4d f9 2e 51 52 fe ff 65 31 3a 71 34 3a
 70 69 6e 67 31 3a 74 34 3a 85 72 00 00 31 3a 76
 34 3a 55 54 7e 62 31 3a 79 31 3a 71 65""")
+
+udp_infos = {
+	"source_mac_address"		:	0x00140b333327,
+	"destination_mac_address"	:	0xd07ab596cd0a,
+	"protocol"					:	0x11,
+	"source_ip_address"			:	0xc0a80165,
+	"destination_ip_address"	:	0xb27b0d78
+}

liteeth/test/model/ip.py

@@ -0,0 +1,98 @@
+import math, binascii
+
+from liteeth.common import *
+from liteeth.mac.common import *
+from liteeth.test.common import *
+
+from liteeth.test.model import mac
+
+def print_ip(s):
+	print_with_prefix(s, "[IP]")
+
+preamble = split_bytes(eth_preamble, 8)
+
+# IP model
+class IPPacket(Packet):
+	def __init__(self, init=[]):
+		Packet.__init__(self, init)
+
+	def decode(self):
+		header = []
+		for byte in self[:ipv4_header_len]:
+			header.append(self.pop(0))
+		for k, v in sorted(ipv4_header.items()):
+			setattr(self, k, get_field_data(v, header))
+
+	def encode(self):
+		header = 0
+		for k, v in sorted(ipv4_header.items()):
+			value = merge_bytes(split_bytes(getattr(self, k), math.ceil(v.width/8)), "little")
+			header += (value << v.offset+(v.byte*8))
+		for d in split_bytes(header, ipv4_header_len):
+			self.insert(0, d)
+
+	def __repr__(self):
+		r = "--------\n"
+		for k in sorted(ipv4_header.keys()):
+			r += k + " : 0x%x" %getattr(self,k) + "\n"
+		r += "payload: "
+		for d in self:
+			r += "%02x" %d
+		return r
+
+class IP(Module):
+	def  __init__(self, mac, mac_address, ip_address, debug=False):
+		self.mac = mac
+		self.mac_address = mac_address
+		self.ip_address = ip_address
+		self.debug = debug
+		self.tx_packets = []
+		self.tx_packet = IPPacket()
+		self.rx_packet = IPPacket()
+		self.table = {}
+		self.request_pending = False
+
+		self.mac.set_ip_callback(self.callback)
+
+	def send(self, packet):
+		packet.encode()
+		if self.debug:
+			print_ip(">>>>>>>>")
+			print_ip(packet)
+		mac_packet = mac.MACPacket(packet)
+		mac_packet.destination_mac_address = packet.destination_mac_address
+		mac_packet.source_mac_address = packet.source_mac_address
+		mac_packet.ethernet_type = ethernet_type_ip
+		self.mac.send(mac_packet)
+
+	def callback(self, packet):
+		packet = IPPacket(packet)
+		packet.decode()
+		if self.debug:
+			print_ip("<<<<<<<<")
+			print_ip(packet)
+		self.process(packet)
+
+	def process(self, packet):
+		pass
+	
+if __name__ == "__main__":
+	from liteeth.test.model.dumps import *
+	from liteeth.test.model.mac import *
+	errors = 0
+	# ARP request
+	packet = MACPacket(udp)
+	packet.decode_remove_header()
+	#print(packet)
+	packet = IPPacket(packet)
+	# check decoding
+	packet.decode()
+	#print(packet)
+	errors += verify_packet(packet, {})
+	# check encoding
+	packet.encode()
+	packet.decode()
+	#print(packet)
+	errors += verify_packet(packet, {})
+
+	print("ip errors " + str(errors))