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Updates to basic_tunnel and basic (#78)

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* 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.
This commit is contained in:
sibanez12
2017-11-03 21:03:06 -07:00
committed by Robert Soule
parent 66c2cba1b5
commit 6c82b6fbe7
8 changed files with 128 additions and 125 deletions
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26
P4D2_2017_Fall/exercises/basic_tunnel/send.py
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@@ -4,6 +4,7 @@ import sys
import socket
import random
import struct
import argparse
from scapy.all import sendp, send, get_if_list, get_if_hwaddr, hexdump
from scapy.all import Packet
@@ -23,18 +24,25 @@ def get_if():
return iface
def main():
parser = argparse.ArgumentParser()
parser.add_argument('ip_addr', type=str, help="The destination IP address to use")
parser.add_argument('message', type=str, help="The message to include in packet")
parser.add_argument('--dst_id', type=int, default=None, help='The myTunnel dst_id to use, if unspecified then myTunnel header will not be included in packet')
args = parser.parse_args()
if len(sys.argv)<4:
print 'pass 3 arguments: <ip_addr> <dst_nid> "<message>"'
exit(1)
addr = socket.gethostbyname(sys.argv[1])
dst_id = int(sys.argv[2])
addr = socket.gethostbyname(args.ip_addr)
dst_id = args.dst_id
iface = get_if()
print "sending on interface %s to id %s" % (iface, str(dst_id))
pkt = Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
pkt = pkt / MyTunnel(dst_id=dst_id) / IP(dst=addr) / sys.argv[3]
if (dst_id is not None):
print "sending on interface {} to dst_id {}".format(iface, str(dst_id))
pkt = Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
pkt = pkt / MyTunnel(dst_id=dst_id) / IP(dst=addr) / args.message
else:
print "sending on interface {} to IP addr {}".format(iface, str(addr))
pkt = Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff')
pkt = pkt / IP(dst=addr) / TCP(dport=1234, sport=random.randint(49152,65535)) / args.message
pkt.show2()
# hexdump(pkt)
# print "len(pkt) = ", len(pkt)