b2161b8a27
- Minor fixes to p4runtime exercise and README - Adding p4runtime/solution - Adding p4runtime/topology.json - Updating .gitignore to include solution directory and topology.json - Fixing root-bootstrap to exit on errors - Updating VM name in Vagrantfile - Setting up VM to automatically log 'p4' user in on startup
174 lines
7.0 KiB
Python
Executable File
174 lines
7.0 KiB
Python
Executable File
#!/usr/bin/env python2
|
|
import argparse
|
|
import os
|
|
from time import sleep
|
|
|
|
import p4runtime_lib.bmv2
|
|
import p4runtime_lib.helper
|
|
|
|
SWITCH_TO_HOST_PORT = 1
|
|
SWITCH_TO_SWITCH_PORT = 2
|
|
|
|
def writeTunnelRules(p4info_helper, ingress_sw, egress_sw, tunnel_id,
|
|
dst_eth_addr, dst_ip_addr):
|
|
'''
|
|
Installs three rules:
|
|
1) An tunnel ingress rule on the ingress switch in the ipv4_lpm table that
|
|
encapsulates traffic into a tunnel with the specified ID
|
|
2) A transit rule on the ingress switch that forwards traffic based on
|
|
the specified ID
|
|
3) An tunnel egress rule on the egress switch that decapsulates traffic
|
|
with the specified ID and sends it to the host
|
|
|
|
:param p4info_helper: the P4Info helper
|
|
:param ingress_sw: the ingress switch connection
|
|
:param egress_sw: the egress switch connection
|
|
:param tunnel_id: the specified tunnel ID
|
|
:param dst_eth_addr: the destination IP to match in the ingress rule
|
|
:param dst_ip_addr: the destination Ethernet address to write in the
|
|
egress rule
|
|
'''
|
|
# 1) Tunnel Ingress Rule
|
|
table_entry = p4info_helper.buildTableEntry(
|
|
table_name="ipv4_lpm",
|
|
match_fields={
|
|
"hdr.ipv4.dstAddr": (dst_ip_addr, 32)
|
|
},
|
|
action_name="myTunnel_ingress",
|
|
action_params={
|
|
"dst_id": tunnel_id,
|
|
})
|
|
ingress_sw.WriteTableEntry(table_entry)
|
|
print "Installed ingress tunnel rule on %s" % ingress_sw.name
|
|
|
|
# 2) Tunnel Transit Rule
|
|
# The rule will need to be added to the myTunnel_exact table and match on
|
|
# the tunnel ID (hdr.myTunnel.dst_id). For our simple topology, transit
|
|
# traffic will need to be forwarded on the using the myTunnel_forward action
|
|
# on the SWITCH_TO_SWITCH_PORT (port 2).
|
|
#
|
|
# We will only need on transit rule on the ingress switch because we are
|
|
# using a simple topology. In general, you'll need on transit rule for
|
|
# each switch in the path (except the last one).
|
|
|
|
# TODO build the transit rule
|
|
# TODO install the transit rule on the ingress switch
|
|
print "TODO Install transit tunnel rule"
|
|
|
|
# 3) Tunnel Egress Rule
|
|
# For our simple topology, the host will always be located on the
|
|
# SWITCH_TO_HOST_PORT (port 1).
|
|
# In general, you will need to keep track of which port the host is
|
|
# connected to.
|
|
table_entry = p4info_helper.buildTableEntry(
|
|
table_name="myTunnel_exact",
|
|
match_fields={
|
|
"hdr.myTunnel.dst_id": tunnel_id
|
|
},
|
|
action_name="myTunnel_egress",
|
|
action_params={
|
|
"dstAddr": dst_eth_addr,
|
|
"port": SWITCH_TO_HOST_PORT
|
|
})
|
|
egress_sw.WriteTableEntry(table_entry)
|
|
print "Installed egress tunnel rule on %s" % egress_sw.name
|
|
|
|
def readTableRules(p4info_helper, sw):
|
|
'''
|
|
Reads the table entries from all tables on the switch.
|
|
|
|
:param p4info_helper: the P4Info helper
|
|
:param sw: the switch connection
|
|
'''
|
|
print '\n----- Reading tables rules for %s -----' % sw.name
|
|
for response in sw.ReadTableEntries():
|
|
for entity in response.entities:
|
|
entry = entity.table_entry
|
|
# TODO For extra credit, you can use the p4info_helper to translate
|
|
# the IDs the entry to names
|
|
print entry
|
|
print '-----'
|
|
|
|
def printCounter(p4info_helper, sw, counter_name, index):
|
|
'''
|
|
Reads the specified counter at the specified index from the switch. In our
|
|
program, the index is the tunnel ID. If the index is 0, it will return all
|
|
values from the counter.
|
|
|
|
:param p4info_helper: the P4Info helper
|
|
:param sw: the switch connection
|
|
:param counter_name: the name of the counter from the P4 program
|
|
:param index: the counter index (in our case, the tunnel ID)
|
|
'''
|
|
for response in sw.ReadCounters(p4info_helper.get_counters_id(counter_name), index):
|
|
for entity in response.entities:
|
|
counter = entity.counter_entry
|
|
print "%s %s %d: %d packets (%d bytes)" % (
|
|
sw.name, counter_name, index,
|
|
counter.data.packet_count, counter.data.byte_count
|
|
)
|
|
|
|
|
|
def main(p4info_file_path, bmv2_file_path):
|
|
# Instantiate a P4 Runtime helper from the p4info file
|
|
p4info_helper = p4runtime_lib.helper.P4InfoHelper(p4info_file_path)
|
|
|
|
# Create a switch connection object for s1 and s2;
|
|
# this is backed by a P4 Runtime gRPC connection
|
|
s1 = p4runtime_lib.bmv2.Bmv2SwitchConnection('s1', address='127.0.0.1:50051')
|
|
s2 = p4runtime_lib.bmv2.Bmv2SwitchConnection('s2', address='127.0.0.1:50052')
|
|
|
|
# Install the P4 program on the switches
|
|
s1.SetForwardingPipelineConfig(p4info=p4info_helper.p4info,
|
|
bmv2_json_file_path=bmv2_file_path)
|
|
print "Installed P4 Program using SetForwardingPipelineConfig on %s" % s1.name
|
|
s2.SetForwardingPipelineConfig(p4info=p4info_helper.p4info,
|
|
bmv2_json_file_path=bmv2_file_path)
|
|
print "Installed P4 Program using SetForwardingPipelineConfig on %s" % s2.name
|
|
|
|
# Write the rules that tunnel traffic from h1 to h2
|
|
writeTunnelRules(p4info_helper, ingress_sw=s1, egress_sw=s2, tunnel_id=100,
|
|
dst_eth_addr="00:00:00:00:02:02", dst_ip_addr="10.0.2.2")
|
|
|
|
# Write the rules that tunnel traffic from h2 to h1
|
|
writeTunnelRules(p4info_helper, ingress_sw=s2, egress_sw=s1, tunnel_id=200,
|
|
dst_eth_addr="00:00:00:00:01:01", dst_ip_addr="10.0.1.1")
|
|
|
|
# TODO Uncomment the following two lines to read table entries from s1 and s2
|
|
#readTableRules(p4info_helper, s1)
|
|
#readTableRules(p4info_helper, s2)
|
|
|
|
# Print the tunnel counters every 2 seconds
|
|
try:
|
|
while True:
|
|
sleep(2)
|
|
print '\n----- Reading tunnel counters -----'
|
|
printCounter(p4info_helper, s1, "ingressTunnelCounter", 100)
|
|
printCounter(p4info_helper, s2, "egressTunnelCounter", 100)
|
|
printCounter(p4info_helper, s2, "ingressTunnelCounter", 200)
|
|
printCounter(p4info_helper, s1, "egressTunnelCounter", 200)
|
|
except KeyboardInterrupt:
|
|
print " Shutting down."
|
|
|
|
|
|
if __name__ == '__main__':
|
|
parser = argparse.ArgumentParser(description='P4Runtime Controller')
|
|
parser.add_argument('--p4info', help='p4info proto in text format from p4c',
|
|
type=str, action="store", required=False,
|
|
default='./build/advanced_tunnel.p4info')
|
|
parser.add_argument('--bmv2-json', help='BMv2 JSON file from p4c',
|
|
type=str, action="store", required=False,
|
|
default='./build/advanced_tunnel.json')
|
|
args = parser.parse_args()
|
|
|
|
if not os.path.exists(args.p4info):
|
|
parser.print_help()
|
|
print "\np4info file not found: %s\nHave you run 'make'?" % args.p4info
|
|
parser.exit(1)
|
|
if not os.path.exists(args.bmv2_json):
|
|
parser.print_help()
|
|
print "\nBMv2 JSON file not found: %s\nHave you run 'make'?" % args.bmv2_json
|
|
parser.exit(1)
|
|
|
|
main(args.p4info, args.bmv2_json)
|