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test: add dhcpv6 client tests
 - Basic DHCPv6 client, request a lease and verify Linux installs a default route from the Router Advertisements (option not included in DHCPv6), hence the 'enable-ra' option to dnsmasq. Also verify DNS resolution over IPv6, including the resolvconf dance - Prefix delegation, verifies that the client can actually request and receives a prefix from a DHCPv6 server. We don't do anything with it today though Two new DHCP server implementations, the basic test relies on dnsmasq and the prefix delegation test requires an ISC based dhcp server with server side support for ipv6 prefix delegation. We could reuse the latter for both tests, but this way we get compatibility testing. Signed-off-by: Joachim Wiberg <[email protected]>
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‎test/case/infix_dhcp/client6_basic/Readme.adoc‎

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test.adoc

‎test/case/infix_dhcp/client6_basic/test.py‎

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#!/usr/bin/env python3
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"""DHCPv6 Basic
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Enable a DHCPv6 client and verify it requests an IPv6 lease from a
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DHCPv6 server that is then set on the interface.
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"""
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import infamy
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import infamy.dhcp
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import infamy.iface as iface
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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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SERVER = '2001:db8::1'
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CLIENT = '2001:db8::42'
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DOMAIN = 'example.com'
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VERIFY = 'server.' + DOMAIN
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with test.step("Set up topology and attach to target DUT"):
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env = infamy.Env()
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client = env.attach("client", "mgmt")
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tgtssh = env.attach("client", "mgmt", "ssh")
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_, host = env.ltop.xlate("host", "data")
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_, port = env.ltop.xlate("client", "data")
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with infamy.IsolatedMacVlan(host) as netns:
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netns.addip(SERVER, prefix_length=64, proto="ipv6")
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with infamy.dhcp.Server6Dnsmasq(netns,
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start=CLIENT,
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end=CLIENT,
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dns=SERVER,
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domain=DOMAIN,
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address=SERVER):
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with test.step("Configure DHCPv6 client"):
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config = {
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"interfaces": {
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"interface": [{
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"name": f"{port}",
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"ipv6": {
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"enabled": True,
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"infix-dhcpv6-client:dhcp": {
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"option": [
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{"id": "dns-server"},
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{"id": "domain-search"}
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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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client.put_config_dict("ietf-interfaces", config)
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with test.step(f"Verify client lease for {CLIENT}"):
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until(lambda: iface.address_exist(client, port, CLIENT, prefix_length=128))
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with test.step("Verify client default route ::/0"):
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until(lambda: route.ipv6_route_exist(client, "::/0"), attempts=20)
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with test.step("Verify client domain name resolution"):
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rc = tgtssh.runsh(f"ping -6 -c1 -w20 {VERIFY}")
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assert rc.returncode == 0, f"Client failed: ping {VERIFY}"
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test.succeed()

‎test/case/infix_dhcp/client6_basic/topology.dot‎

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graph "1x2" {
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layout="neato";
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overlap="false";
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esep="+100";
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node [shape=record, fontname="DejaVu Sans Mono, Book"];
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edge [color="cornflowerblue", penwidth="2", fontname="DejaVu Serif, Book"];
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host [
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label="host | { <mgmt> mgmt | <data> data }",
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pos="0,20!",
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requires="controller",
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];
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client [
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label="{ <mgmt> mgmt | <data> data } | client",
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pos="200,20!",
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requires="infix",
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];
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host:mgmt -- client:mgmt [requires="mgmt", color=lightgrey]
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host:data -- client:data [color=black, taillabel="2001:db8::1/64", headlabel="2001:db8::42/128"]
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}

‎test/case/infix_dhcp/client6_prefix_delegation/Readme.adoc‎

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test.adoc

‎test/case/infix_dhcp/client6_prefix_delegation/test.py‎

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#!/usr/bin/env python3
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"""DHCPv6 Prefix Delegation
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Verify DHCPv6 prefix delegation (IA_PD) where a client requests an IPv6
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prefix from a DHCPv6 server. This is commonly used on WAN interfaces of
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routers to obtain a prefix for distribution to downstream networks.
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"""
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import infamy, infamy.dhcp
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import infamy.iface as iface
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from infamy.util import until
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import time
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def checkrun(dut):
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"""Check DUT is running DHCPv6 client"""
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res = dut.runsh(f"pgrep -f 'udhcpc6.*{port}'")
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# print(f"Checking for udhcpc6: {res.stdout}")
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if res.stdout.strip() != "":
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return True
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return False
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def checklog(dut):
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"""Check syslog for prefix delegation message"""
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rc = dut.runsh("tail -10 /log/syslog | grep 'received delegated prefix'")
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# print(f"DHCPv6 client logs:\n{res.stdout}")
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if rc.stdout.strip() != "":
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return True
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return False
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with infamy.Test() as test:
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SERVER = '2001:db8::1'
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CLIENT = '2001:db8::42'
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PREFIX = '2001:db8:1::/48'
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with test.step("Set up topology and attach to target DUT"):
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env = infamy.Env()
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client = env.attach("client", "mgmt")
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tgtssh = env.attach("client", "mgmt", "ssh")
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_, host = env.ltop.xlate("host", "data")
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_, port = env.ltop.xlate("client", "data")
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with infamy.IsolatedMacVlan(host) as netns:
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netns.addip(SERVER, prefix_length=48, proto="ipv6")
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with infamy.dhcp.Server6Dhcpd(netns=netns,
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start="2001:db8::100",
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end="2001:db8::200",
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prefix="2001:db8:100::",
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prefix_len=64,
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dns="2001:db8::1",
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iface="iface",
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subnet="2001:db8::/48"):
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with test.step("Configure DHCPv6 client w/ prefix delegation"):
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config = {
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"interfaces": {
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"interface": [{
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"name": f"{port}",
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"ipv6": {
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"enabled": True,
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"infix-dhcpv6-client:dhcp": {
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"option": [
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{"id": "dns-server"},
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{"id": "ia-pd"}
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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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client.put_config_dict("ietf-interfaces", config)
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with test.step("Verify DHCPv6 client is running"):
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until(lambda: checkrun(tgtssh))
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with test.step("Verify prefix delegation in logs"):
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until(lambda: checklog(tgtssh))
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test.succeed()

‎test/case/infix_dhcp/client6_prefix_delegation/topology.dot‎

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graph "1x2" {
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layout="neato";
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overlap="false";
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esep="+100";
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node [shape=record, fontname="DejaVu Sans Mono, Book"];
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edge [color="cornflowerblue", penwidth="2", fontname="DejaVu Serif, Book"];
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host [
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label="host | { <mgmt> mgmt | <data> data }",
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pos="0,20!",
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requires="controller",
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];
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client [
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label="{ <mgmt> mgmt | <data> data } | client",
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pos="200,20!",
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requires="infix",
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];
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host:mgmt -- client:mgmt [requires="mgmt", color=lightgrey]
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host:data -- client:data [color=black, taillabel="2001:db8::1/64", headlabel="DHCPv6-PD: 2001:db8:1::/48"]
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}

‎test/case/infix_dhcp/dhcp_client.yaml‎

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- name: DHCP option 121 vs option 3
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case: client_routes/test.py
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- name: DHCPv6 Basic
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case: client6_basic/test.py
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- name: DHCPv6 Prefix Delegation
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case: client6_prefix_delegation/test.py

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