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Attached hosts

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allow this config to function:
  set int ip address loop0 169.254.1.1/32  (the default GW address for attached hosts)
  set int unnumbered af_packet0 use loop0  ('enable' IP on the host interface)
  ip route add 192.168.1.1/32 via af_packet0 (where to find the host)
repeat for each host and host interface.
Inter-host communication is throught the /32 routes.
To allow this:
 1 - attached host routes have the ATTACHED flag set, so the ARP code accepts then as legitimate sources
 2 - unnumbered interfaces inherit the source address from the IP interface

Change-Id: Ib66c5f0e848c528f79372813adc3a0c11b50717f
Signed-off-by: Neale Ranns <nranns@cisco.com>
This commit is contained in:
Neale Ranns
2017-03-11 05:55:21 -08:00
committed by Florin Coras
parent c60f557590
commit 4b919a5664
10 changed files with 269 additions and 30 deletions
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176
test/test_neighbor.py
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@ -44,9 +44,15 @@ class ARPTestCase(VppTestCase):
def tearDown(self):
super(ARPTestCase, self).tearDown()
self.pg0.unconfig_ip4()
self.pg0.unconfig_ip6()
self.pg1.unconfig_ip4()
self.pg1.unconfig_ip6()
self.pg3.unconfig_ip4()
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
def verify_arp_req(self, rx, smac, sip, dip):
@ -115,7 +121,7 @@ class ARPTestCase(VppTestCase):
#
# Generate some hosts on the LAN
#
self.pg1.generate_remote_hosts(6)
self.pg1.generate_remote_hosts(9)
#
# Send IP traffic to one of these unresolved hosts.
@ -249,6 +255,47 @@ class ARPTestCase(VppTestCase):
self.assertTrue(find_nbr(self,
self.pg1.sw_if_index,
self.pg1._remote_hosts[3].ip4))
#
# Fire in an ARP request before the interface becomes IP enabled
#
self.pg2.generate_remote_hosts(4)
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
pdst=self.pg1.local_ip4,
psrc=self.pg2.remote_hosts[3].ip4))
self.send_and_assert_no_replies(self.pg2, p,
"interface not IP enabled")
#
# Make pg2 un-numbered to pg1
#
self.pg2.set_unnumbered(self.pg1.sw_if_index)
#
# We should respond to ARP requests for the unnumbered to address
# once an attached route to the source is known
#
self.send_and_assert_no_replies(
self.pg2, p,
"ARP req for unnumbered address - no source")
attached_host = VppIpRoute(self, self.pg2.remote_hosts[3].ip4, 32,
[VppRoutePath("0.0.0.0",
self.pg2.sw_if_index)])
attached_host.add_vpp_config()
self.pg2.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = self.pg2.get_capture(1)
self.verify_arp_resp(rx[0],
self.pg2.local_mac,
self.pg2.remote_mac,
self.pg1.local_ip4,
self.pg2.remote_hosts[3].ip4)
#
# A neighbor entry that has no associated FIB-entry
@ -270,12 +317,8 @@ class ARPTestCase(VppTestCase):
self.pg1._remote_hosts[4].ip4,
32))
#
# Unnumbered pg2 to pg1
#
self.pg2.set_unnumbered(self.pg1.sw_if_index)
#
# now we can form adjacencies out of pg2 from within pg1's subnet
# pg2 is unnumbered to pg1, so we can form adjacencies out of pg2
# from within pg1's subnet
#
arp_unnum = VppNeighbor(self,
self.pg2.sw_if_index,
@ -301,11 +344,101 @@ class ARPTestCase(VppTestCase):
self.pg0.remote_ip4,
self.pg1._remote_hosts[5].ip4)
#
# ARP requests from hosts in pg1's subnet sent on pg2 are replied to
# with the unnumbered interface's address as the source
#
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
pdst=self.pg1.local_ip4,
psrc=self.pg1.remote_hosts[6].ip4))
self.pg2.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = self.pg2.get_capture(1)
self.verify_arp_resp(rx[0],
self.pg2.local_mac,
self.pg2.remote_mac,
self.pg1.local_ip4,
self.pg1.remote_hosts[6].ip4)
#
# An attached host route out of pg2 for an undiscovered hosts generates
# an ARP request with the unnumbered address as the source
#
att_unnum = VppIpRoute(self, self.pg1.remote_hosts[7].ip4, 32,
[VppRoutePath("0.0.0.0",
self.pg2.sw_if_index)])
att_unnum.add_vpp_config()
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4,
dst=self.pg1._remote_hosts[7].ip4) /
UDP(sport=1234, dport=1234) /
Raw())
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = self.pg2.get_capture(1)
self.verify_arp_req(rx[0],
self.pg2.local_mac,
self.pg1.local_ip4,
self.pg1._remote_hosts[7].ip4)
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
pdst=self.pg1.local_ip4,
psrc=self.pg1.remote_hosts[7].ip4))
self.pg2.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = self.pg2.get_capture(1)
self.verify_arp_resp(rx[0],
self.pg2.local_mac,
self.pg2.remote_mac,
self.pg1.local_ip4,
self.pg1.remote_hosts[7].ip4)
#
# An attached host route as yet unresolved out of pg2 for an
# undiscovered host, an ARP requests begets a response.
#
att_unnum1 = VppIpRoute(self, self.pg1.remote_hosts[8].ip4, 32,
[VppRoutePath("0.0.0.0",
self.pg2.sw_if_index)])
att_unnum1.add_vpp_config()
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
pdst=self.pg1.local_ip4,
psrc=self.pg1.remote_hosts[8].ip4))
self.pg2.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
rx = self.pg2.get_capture(1)
self.verify_arp_resp(rx[0],
self.pg2.local_mac,
self.pg2.remote_mac,
self.pg1.local_ip4,
self.pg1.remote_hosts[8].ip4)
#
# ERROR Cases
# 1 - don't respond to ARP request for address not within the
# interface's sub-net
#
# 1a - nor within the unnumbered subnet
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg0.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg0.remote_mac,
@ -313,6 +446,14 @@ class ARPTestCase(VppTestCase):
psrc=self.pg0.remote_ip4))
self.send_and_assert_no_replies(self.pg0, p,
"ARP req for non-local destination")
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
pdst="10.10.10.3",
psrc=self.pg1.remote_hosts[7].ip4))
self.send_and_assert_no_replies(
self.pg0, p,
"ARP req for non-local destination - unnum")
#
# 2 - don't respond to ARP request from an address not within the
@ -325,6 +466,14 @@ class ARPTestCase(VppTestCase):
pdst=self.pg0.local_ip4))
self.send_and_assert_no_replies(self.pg0, p,
"ARP req for non-local source")
p = (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.pg2.remote_mac) /
ARP(op="who-has",
hwsrc=self.pg2.remote_mac,
psrc="10.10.10.3",
pdst=self.pg0.local_ip4))
self.send_and_assert_no_replies(
self.pg0, p,
"ARP req for non-local source - unnum")
#
# 3 - don't respond to ARP request from an address that belongs to
@ -358,6 +507,10 @@ class ARPTestCase(VppTestCase):
static_arp.remove_vpp_config()
self.pg2.unset_unnumbered(self.pg1.sw_if_index)
# need this to flush the adj-fibs
self.pg2.unset_unnumbered(self.pg1.sw_if_index)
self.pg2.admin_down()
def test_proxy_arp(self):
""" Proxy ARP """
@ -500,7 +653,7 @@ class ARPTestCase(VppTestCase):
#
# clean up on interface 2
#
self.pg2.set_unnumbered(self.pg1.sw_if_index)
self.pg2.unset_unnumbered(self.pg1.sw_if_index)
def test_mpls(self):
""" MPLS """
@ -560,6 +713,7 @@ class ARPTestCase(VppTestCase):
55,
self.pg0.remote_ip4,
"10.0.0.1")
self.pg2.unconfig_ip4()
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)