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1 | #!/usr/bin/env python |
2 | ||
3 | # | |
4 | # bgp_tcp_mss.py | |
5 | # Part of NetDEF Topology Tests | |
6 | # | |
7 | # Copyright (c) 2021 by | |
8 | # Abhinay Ramesh <rabhinay@vmware.com> | |
9 | # | |
10 | # Permission to use, copy, modify, and/or distribute this software | |
11 | # for any purpose with or without fee is hereby granted, provided | |
12 | # that the above copyright notice and this permission notice appear | |
13 | # in all copies. | |
14 | # | |
15 | # THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES | |
16 | # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
17 | # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR | |
18 | # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY | |
19 | # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, | |
20 | # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
21 | # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
22 | # OF THIS SOFTWARE. | |
23 | # | |
24 | ||
25 | """ | |
26 | bgp_tcp_mss.py: | |
27 | ||
28 | Test if works the following commands: | |
29 | router bgp 65000 | |
30 | neighbor 192.168.255.2 tcp-mss 500 | |
31 | ||
32 | Need to verify if the tcp-mss value is reflected in the TCP session. | |
33 | """ | |
34 | ||
35 | import os | |
36 | import sys | |
37 | import json | |
38 | import time | |
39 | import pytest | |
40 | import functools | |
41 | ||
42 | # add after imports, before defining classes or functions: | |
43 | pytestmark = [pytest.mark.bgpd] | |
44 | ||
45 | CWD = os.path.dirname(os.path.realpath(__file__)) | |
46 | sys.path.append(os.path.join(CWD, "../")) | |
47 | ||
48 | # pylint: disable=C0413 | |
49 | from lib import topotest | |
50 | from lib.topogen import Topogen, TopoRouter, get_topogen | |
51 | from lib.topolog import logger | |
52 | from mininet.topo import Topo | |
53 | ||
54 | ||
55 | class TemplateTopo(Topo): | |
56 | def build(self, *_args, **_opts): | |
57 | tgen = get_topogen(self) | |
58 | ||
59 | for routern in range(1, 3): | |
60 | tgen.add_router("r{}".format(routern)) | |
61 | ||
62 | switch = tgen.add_switch("s1") | |
63 | switch.add_link(tgen.gears["r1"]) | |
64 | switch.add_link(tgen.gears["r2"]) | |
65 | ||
66 | ||
67 | def setup_module(mod): | |
68 | tgen = Topogen(TemplateTopo, mod.__name__) | |
69 | tgen.start_topology() | |
70 | ||
71 | router_list = tgen.routers() | |
72 | ||
73 | for i, (rname, router) in enumerate(router_list.items(), 1): | |
74 | router.load_config( | |
75 | TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname)) | |
76 | ) | |
77 | router.load_config( | |
78 | TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname)) | |
79 | ) | |
80 | ||
81 | tgen.start_router() | |
82 | ||
83 | ||
84 | def teardown_module(mod): | |
85 | tgen = get_topogen() | |
86 | tgen.stop_topology() | |
87 | ||
88 | ||
89 | def test_bgp_tcp_mss(): | |
90 | tgen = get_topogen() | |
91 | ||
92 | if tgen.routers_have_failure(): | |
93 | pytest.skip(tgen.errors) | |
94 | ||
95 | router1 = tgen.gears["r1"] | |
96 | router2 = tgen.gears["r2"] | |
97 | ||
98 | def _bgp_converge(router): | |
99 | output = json.loads(router.vtysh_cmd("show ip bgp neighbor 192.168.255.2 json")) | |
100 | expected = { | |
101 | "192.168.255.2": { | |
102 | "bgpState": "Established", | |
103 | "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 0}}, | |
104 | } | |
105 | } | |
106 | return topotest.json_cmp(output, expected) | |
107 | ||
108 | def _bgp_conf_tcp_mss(router, as_num, neigh): | |
109 | router.vtysh_cmd( | |
110 | """configure terminal | |
111 | router bgp {0} | |
112 | neighbor {1} tcp-mss 500""".format( | |
113 | as_num, neigh | |
114 | ) | |
115 | ) | |
116 | ||
117 | def _bgp_clear_session(router): | |
118 | router.vtysh_cmd("clear bgp *") | |
119 | ||
120 | def _bgp_check_neighbor_tcp_mss(router, neigh): | |
121 | output = json.loads(router.vtysh_cmd("show bgp neighbor {} json".format(neigh))) | |
122 | expected = { | |
123 | "{}".format(neigh): {"bgpTcpMssConfigured": 500, "bgpTcpMssSynced": 488} | |
124 | } | |
125 | return topotest.json_cmp(output, expected) | |
126 | ||
127 | logger.info("Check if neighbor sessions are up in {}".format(router1.name)) | |
128 | test_func = functools.partial(_bgp_converge, router1) | |
129 | success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5) | |
130 | assert result is None, 'Failed to see BGP convergence in "{}"'.format(router1.name) | |
131 | ||
132 | logger.info("BGP neighbor session is up in {}".format(router1.name)) | |
133 | ||
134 | logger.info( | |
135 | "Configure tcp-mss 500 on {} and reset the session".format(router1.name) | |
136 | ) | |
137 | _bgp_conf_tcp_mss(router1, "65000", "192.168.255.2") | |
138 | _bgp_clear_session(router1) | |
139 | ||
140 | logger.info( | |
141 | "Configure tcp-mss 500 on {} and reset the session".format(router2.name) | |
142 | ) | |
143 | _bgp_conf_tcp_mss(router2, "65001", "192.168.255.1") | |
144 | _bgp_clear_session(router2) | |
145 | ||
146 | logger.info( | |
147 | "Check if neighbor session is up after reset in {}".format(router1.name) | |
148 | ) | |
149 | test_func = functools.partial(_bgp_converge, router1) | |
150 | success, result = topotest.run_and_expect(test_func, None, count=15, wait=0.5) | |
151 | assert result is None, 'Failed to see BGP convergence after reset in "{}"'.format( | |
152 | router1.name | |
153 | ) | |
154 | ||
155 | logger.info( | |
156 | "Verify if TCP MSS value is synced with neighbor in {}".format(router1.name) | |
157 | ) | |
158 | test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router1, "192.168.255.2") | |
159 | success, result = topotest.run_and_expect(test_func, None, count=3, wait=0.5) | |
160 | assert ( | |
161 | result is None | |
162 | ), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router1.name) | |
163 | logger.info("TCP MSS value is synced with neighbor in {}".format(router1.name)) | |
164 | ||
165 | logger.info( | |
166 | "Verify if TCP MSS value is synced with neighbor in {}".format(router2.name) | |
167 | ) | |
168 | test_func = functools.partial(_bgp_check_neighbor_tcp_mss, router2, "192.168.255.1") | |
169 | success, result = topotest.run_and_expect(test_func, None, count=3, wait=0.5) | |
170 | assert ( | |
171 | result is None | |
172 | ), 'Failed to sync TCP MSS value over BGP session in "{}"'.format(router2.name) | |
173 | logger.info("TCP MSS value is synced with neighbor in {}".format(router2.name)) | |
174 | ||
175 | ||
176 | if __name__ == "__main__": | |
177 | args = ["-s"] + sys.argv[1:] | |
178 | sys.exit(pytest.main(args)) |