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92 lines
3.5 KiB
Python
Executable File
92 lines
3.5 KiB
Python
Executable File
#!/usr/bin/env python3
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"""DHCP option 121 vs option 3
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Verify that DHCP option 121 (classless static routes) is used over the
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older option 3 (default gateway) in the DHCP client, when both are sent
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by the server, see RFC3442. Use the routing RIB in the operational
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datastore to verify.
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Installing routes from a DHCP server should not affect already existing
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(static) routes. To verify this, a static canary route (20.0.0.0/24 via
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192.168.0.2) is installed before starting the DHCP client. As a twist,
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this canary route has a next-hop (192.168.0.2) which is not reachable
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until a DHCP lease has been acquired.
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The DHCP server is set up to hand out both a default router (option 3)
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via 192.168.0.1 and a default route (option 121) via 192.168.0.254.
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"""
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import infamy
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import infamy.dhcp
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import infamy.route as route
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from infamy.util import until
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with infamy.Test() as test:
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PREFIX = '10.0.0.0/24'
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ROUTER = '192.168.0.254'
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CANARY = '20.0.0.0/24'
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CANHOP = '192.168.0.2'
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with test.step("Setting up canary route, 20.0.0.0/24 via 192.168.0.2"):
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env = infamy.Env()
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client = env.attach("client", "mgmt")
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_, host = env.ltop.xlate("host", "data")
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# Install canary route to smoke out any regressions in
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# how the DHCP client installs routes in the kernel FIB
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client.put_config_dict("ietf-routing", {
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"routing": {
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"control-plane-protocols": {
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"control-plane-protocol": [{
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"type": "infix-routing:static",
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"name": "default",
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"static-routes": {
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"ipv4": {
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"route": [{
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"destination-prefix": CANARY,
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"next-hop": {
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"next-hop-address": CANHOP
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},
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"infix-routing:route-preference": 250
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}]
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}
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}
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}]
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}
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}
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})
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with test.step("Enabling DHCP client, allow option 3 and 121"):
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_, port = env.ltop.xlate("client", "data")
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client.put_config_dict("infix-dhcp-client", {
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"dhcp-client": {
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"client-if": [{
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"if-name": f"{port}",
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"option": [
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{"id": "router"},
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{"id": "classless-static-route"}
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]
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}]
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}
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})
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with infamy.IsolatedMacVlan(host) as netns:
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netns.addip("192.168.0.1")
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print(f"Start DHCP server {ROUTER} with option 3 and 121")
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with infamy.dhcp.Server(netns, prefix=PREFIX, router=ROUTER):
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with test.step("Verify client has route 10.0.0.0/24 via 192.168.0.254 (option 121)"):
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print("Verify client use classless routes, option 121")
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until(lambda: route.ipv4_route_exist(client, PREFIX, ROUTER))
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with test.step("Verify client has default route via 192.168.0.254 (not use option 3)"):
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print("Verify client did *not* use option 3")
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if route.ipv4_route_exist(client, "0.0.0.0/0", ROUTER):
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test.fail()
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with test.step("Verify client still has canary route to 20.0.0.0/24 via 192.168.0.2"):
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until(lambda: route.ipv4_route_exist(client, CANARY,
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CANHOP, pref=250))
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test.succeed()
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