6c82b6fbe7
* Adding initial implementation of basic_encap example * Updated basic_encap example to count the number of valid packets * Updated basic_encap example to put encapsulation layer after Ethernet header. * Added solution file for basic_encap example * Changed the name of the basic_encap example to basic_tunnel and called the new header myTunnel. Also changed the myTunnel field names slightly. * Updated the README file for the basic_tunnel exercise. Also added topo.pdf image to serve as a reference during implementation. * Updated basic/README.md to point to basic_tunnel as the next exercise. * Updated the README for basic to point to basic_tunnel. Updated the starter code for basic_tunnel to look like basic solution with todo comments. Updated send.py and receive.py to be able to send both plain IP packets and tunneled IP packets. Updated basic_tunnel.p4 to have same control flow as p4runtime exercise.
44 lines
1.1 KiB
Python
Executable File
44 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python
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import sys
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import struct
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import os
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from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
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from scapy.all import Packet, IPOption
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from scapy.all import ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
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from scapy.all import IP, TCP, UDP, Raw
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from scapy.layers.inet import _IPOption_HDR
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from myTunnel_header import MyTunnel
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def get_if():
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ifs=get_if_list()
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iface=None
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for i in get_if_list():
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if "eth0" in i:
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iface=i
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break;
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if not iface:
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print "Cannot find eth0 interface"
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exit(1)
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return iface
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def handle_pkt(pkt):
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if MyTunnel in pkt or (TCP in pkt and pkt[TCP].dport == 1234):
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print "got a packet"
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pkt.show2()
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# hexdump(pkt)
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# print "len(pkt) = ", len(pkt)
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sys.stdout.flush()
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def main():
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ifaces = filter(lambda i: 'eth' in i, os.listdir('/sys/class/net/'))
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iface = ifaces[0]
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print "sniffing on %s" % iface
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sys.stdout.flush()
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sniff(iface = iface,
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prn = lambda x: handle_pkt(x))
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if __name__ == '__main__':
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main()
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