git.puffer.fish Git - mirror/frr.git/blob

   1 #!/usr/bin/env python
   2
   3 # Copyright (c) 2021 by
   4 # Donatas Abraitis <donatas.abraitis@gmail.com>
   5 #
   6 # Permission to use, copy, modify, and/or distribute this software
   7 # for any purpose with or without fee is hereby granted, provided
   8 # that the above copyright notice and this permission notice appear
   9 # in all copies.
  10 #
  11 # THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
  12 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
  14 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
  15 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  16 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  17 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  18 # OF THIS SOFTWARE.
  19 #
  20
  21 """
  22 https://tools.ietf.org/html/rfc4271
  23
  24 Check if NEXT_HOP attribute is not changed if peer X shares a
  25 common subnet with this address.
  26
  27 - Otherwise, if the route being announced was learned from an
  28   external peer, the speaker can use an IP address of any
  29   adjacent router (known from the received NEXT_HOP attribute)
  30   that the speaker itself uses for local route calculation in
  31   the NEXT_HOP attribute, provided that peer X shares a common
  32   subnet with this address.  This is a second form of "third
  33   party" NEXT_HOP attribute.
  34 """
  35
  36 import os
  37 import sys
  38 import json
  39 import time
  40 import pytest
  41 import functools
  42
  43 CWD = os.path.dirname(os.path.realpath(__file__))
  44 sys.path.append(os.path.join(CWD, "../"))
  45
  46 # pylint: disable=C0413
  47 from lib import topotest
  48 from lib.topogen import Topogen, TopoRouter, get_topogen
  49 from lib.topolog import logger
  50 from mininet.topo import Topo
  51
  52
  53 class TemplateTopo(Topo):
  54     def build(self, *_args, **_opts):
  55         tgen = get_topogen(self)
  56
  57         for routern in range(1, 4):
  58             tgen.add_router("r{}".format(routern))
  59
  60         switch = tgen.add_switch("s1")
  61         switch.add_link(tgen.gears["r1"])
  62         switch.add_link(tgen.gears["r2"])
  63         switch.add_link(tgen.gears["r3"])
  64
  65
  66 def setup_module(mod):
  67     tgen = Topogen(TemplateTopo, mod.__name__)
  68     tgen.start_topology()
  69
  70     router_list = tgen.routers()
  71
  72     for i, (rname, router) in enumerate(router_list.items(), 1):
  73         router.load_config(
  74             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  75         )
  76         router.load_config(
  77             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  78         )
  79
  80     tgen.start_router()
  81
  82
  83 def teardown_module(mod):
  84     tgen = get_topogen()
  85     tgen.stop_topology()
  86
  87
  88 def test_bgp_ebgp_common_subnet_nh_unchanged():
  89     tgen = get_topogen()
  90
  91     if tgen.routers_have_failure():
  92         pytest.skip(tgen.errors)
  93
  94     r2 = tgen.gears["r2"]
  95     r3 = tgen.gears["r3"]
  96
  97     def _bgp_converge(router):
  98         output = json.loads(router.vtysh_cmd("show ip bgp summary json"))
  99         expected = {
 100             "ipv4Unicast": {
 101                 "peers": {
 102                     "192.168.1.1": {"state": "Established"},
 103                     "192.168.1.103": {"state": "Established"},
 104                 }
 105             }
 106         }
 107         return topotest.json_cmp(output, expected)
 108
 109     test_func = functools.partial(_bgp_converge, r3)
 110     success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 111
 112     assert result is None, 'Failed bgp convergence in "{}"'.format(r3)
 113
 114     def _bgp_nh_unchanged(router):
 115         output = json.loads(router.vtysh_cmd("show ip bgp 172.16.1.1/32 json"))
 116         expected = {"paths": [{"nexthops": [{"ip": "192.168.1.1"}]}]}
 117         return topotest.json_cmp(output, expected)
 118
 119     test_func = functools.partial(_bgp_nh_unchanged, r2)
 120     success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
 121
 122     assert result is None, 'Wrong next-hop in "{}"'.format(r2)
 123
 124
 125 if __name__ == "__main__":
 126     args = ["-s"] + sys.argv[1:]
 127     sys.exit(pytest.main(args))