summaryrefslogtreecommitdiff
path: root/cloudinit/net/netplan.py
blob: 63443484b8acb53b233d34343035c1d43c9081c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
# This file is part of cloud-init.  See LICENSE file ...

import copy
import os

from . import renderer
from .network_state import subnet_is_ipv6, NET_CONFIG_TO_V2

from cloudinit import log as logging
from cloudinit import util
from cloudinit.net import SYS_CLASS_NET, get_devicelist

KNOWN_SNAPD_CONFIG = b"""\
# This is the initial network config.
# It can be overwritten by cloud-init or console-conf.
network:
    version: 2
    ethernets:
        all-en:
            match:
                name: "en*"
            dhcp4: true
        all-eth:
            match:
                name: "eth*"
            dhcp4: true
"""

LOG = logging.getLogger(__name__)


def _get_params_dict_by_match(config, match):
    return dict((key, value) for (key, value) in config.items()
                if key.startswith(match))


def _extract_addresses(config, entry):
    """This method parse a cloudinit.net.network_state dictionary (config) and
       maps netstate keys/values into a dictionary (entry) to represent
       netplan yaml.

    An example config dictionary might look like:

    {'mac_address': '52:54:00:12:34:00',
     'name': 'interface0',
     'subnets': [
        {'address': '192.168.1.2/24',
         'mtu': 1501,
         'type': 'static'},
        {'address': '2001:4800:78ff:1b:be76:4eff:fe06:1000",
         'mtu': 1480,
         'netmask': 64,
         'type': 'static'}],
      'type: physical'
    }

    An entry dictionary looks like:

    {'set-name': 'interface0',
     'match': {'macaddress': '52:54:00:12:34:00'},
     'mtu': 1501}

    After modification returns

    {'set-name': 'interface0',
     'match': {'macaddress': '52:54:00:12:34:00'},
     'mtu': 1501,
     'address': ['192.168.1.2/24', '2001:4800:78ff:1b:be76:4eff:fe06:1000"],
     'mtu6': 1480}

    """

    def _listify(obj, token=' '):
        "Helper to convert strings to list of strings, handle single string"
        if not obj or type(obj) not in [str]:
            return obj
        if token in obj:
            return obj.split(token)
        else:
            return [obj, ]

    addresses = []
    routes = []
    nameservers = []
    searchdomains = []
    subnets = config.get('subnets', [])
    if subnets is None:
        subnets = []
    for subnet in subnets:
        sn_type = subnet.get('type')
        if sn_type.startswith('dhcp'):
            if sn_type == 'dhcp':
                sn_type += '4'
            entry.update({sn_type: True})
        elif sn_type in ['static']:
            addr = "%s" % subnet.get('address')
            if 'prefix' in subnet:
                addr += "/%d" % subnet.get('prefix')
            if 'gateway' in subnet and subnet.get('gateway'):
                gateway = subnet.get('gateway')
                if ":" in gateway:
                    entry.update({'gateway6': gateway})
                else:
                    entry.update({'gateway4': gateway})
            if 'dns_nameservers' in subnet:
                nameservers += _listify(subnet.get('dns_nameservers', []))
            if 'dns_search' in subnet:
                searchdomains += _listify(subnet.get('dns_search', []))
            if 'mtu' in subnet:
                mtukey = 'mtu'
                if subnet_is_ipv6(subnet):
                    mtukey += '6'
                entry.update({mtukey: subnet.get('mtu')})
            for route in subnet.get('routes', []):
                to_net = "%s/%s" % (route.get('network'),
                                    route.get('prefix'))
                route = {
                    'via': route.get('gateway'),
                    'to': to_net,
                }
                if 'metric' in route:
                    route.update({'metric': route.get('metric', 100)})
                routes.append(route)

            addresses.append(addr)

    if len(addresses) > 0:
        entry.update({'addresses': addresses})
    if len(routes) > 0:
        entry.update({'routes': routes})
    if len(nameservers) > 0:
        ns = {'addresses': nameservers}
        entry.update({'nameservers': ns})
    if len(searchdomains) > 0:
        ns = entry.get('nameservers', {})
        ns.update({'search': searchdomains})
        entry.update({'nameservers': ns})


def _extract_bond_slaves_by_name(interfaces, entry, bond_master):
    bond_slave_names = sorted([name for (name, cfg) in interfaces.items()
                               if cfg.get('bond-master', None) == bond_master])
    if len(bond_slave_names) > 0:
        entry.update({'interfaces': bond_slave_names})


def _clean_default(target=None):
    # clean out any known default files and derived files in target
    # LP: #1675576
    tpath = util.target_path(target, "etc/netplan/00-snapd-config.yaml")
    if not os.path.isfile(tpath):
        return
    content = util.load_file(tpath, decode=False)
    if content != KNOWN_SNAPD_CONFIG:
        return

    derived = [util.target_path(target, f) for f in (
               'run/systemd/network/10-netplan-all-en.network',
               'run/systemd/network/10-netplan-all-eth.network',
               'run/systemd/generator/netplan.stamp')]
    existing = [f for f in derived if os.path.isfile(f)]
    LOG.debug("removing known config '%s' and derived existing files: %s",
              tpath, existing)

    for f in [tpath] + existing:
        os.unlink(f)


class Renderer(renderer.Renderer):
    """Renders network information in a /etc/netplan/network.yaml format."""

    NETPLAN_GENERATE = ['netplan', 'generate']

    def __init__(self, config=None):
        if not config:
            config = {}
        self.netplan_path = config.get('netplan_path',
                                       'etc/netplan/50-cloud-init.yaml')
        self.netplan_header = config.get('netplan_header', None)
        self._postcmds = config.get('postcmds', False)
        self.clean_default = config.get('clean_default', True)

    def render_network_state(self, network_state, target):
        # check network state for version
        # if v2, then extract network_state.config
        # else render_v2_from_state
        fpnplan = os.path.join(util.target_path(target), self.netplan_path)

        util.ensure_dir(os.path.dirname(fpnplan))
        header = self.netplan_header if self.netplan_header else ""

        # render from state
        content = self._render_content(network_state)

        if not header.endswith("\n"):
            header += "\n"
        util.write_file(fpnplan, header + content)

        if self.clean_default:
            _clean_default(target=target)
        self._netplan_generate(run=self._postcmds)
        self._net_setup_link(run=self._postcmds)

    def _netplan_generate(self, run=False):
        if not run:
            LOG.debug("netplan generate postcmd disabled")
            return
        util.subp(self.NETPLAN_GENERATE, capture=True)

    def _net_setup_link(self, run=False):
        """To ensure device link properties are applied, we poke
           udev to re-evaluate networkd .link files and call
           the setup_link udev builtin command
        """
        if not run:
            LOG.debug("netplan net_setup_link postcmd disabled")
            return
        setup_lnk = ['udevadm', 'test-builtin', 'net_setup_link']
        for cmd in [setup_lnk + [SYS_CLASS_NET + iface]
                    for iface in get_devicelist() if
                    os.path.islink(SYS_CLASS_NET + iface)]:
            util.subp(cmd, capture=True)

    def _render_content(self, network_state):

        # if content already in netplan format, pass it back
        if network_state.version == 2:
            LOG.debug('V2 to V2 passthrough')
            return util.yaml_dumps({'network': network_state.config},
                                   explicit_start=False,
                                   explicit_end=False)

        ethernets = {}
        wifis = {}
        bridges = {}
        bonds = {}
        vlans = {}
        content = []

        interfaces = network_state._network_state.get('interfaces', [])

        nameservers = network_state.dns_nameservers
        searchdomains = network_state.dns_searchdomains

        for config in network_state.iter_interfaces():
            ifname = config.get('name')
            # filter None (but not False) entries up front
            ifcfg = dict((key, value) for (key, value) in config.items()
                         if value is not None)

            if_type = ifcfg.get('type')
            if if_type == 'physical':
                # required_keys = ['name', 'mac_address']
                eth = {
                    'set-name': ifname,
                    'match': ifcfg.get('match', None),
                }
                if eth['match'] is None:
                    macaddr = ifcfg.get('mac_address', None)
                    if macaddr is not None:
                        eth['match'] = {'macaddress': macaddr.lower()}
                    else:
                        del eth['match']
                        del eth['set-name']
                if 'mtu' in ifcfg:
                    eth['mtu'] = ifcfg.get('mtu')

                _extract_addresses(ifcfg, eth)
                ethernets.update({ifname: eth})

            elif if_type == 'bond':
                # required_keys = ['name', 'bond_interfaces']
                bond = {}
                bond_config = {}
                # extract bond params and drop the bond_ prefix as it's
                # redundent in v2 yaml format
                v2_bond_map = NET_CONFIG_TO_V2.get('bond')
                for match in ['bond_', 'bond-']:
                    bond_params = _get_params_dict_by_match(ifcfg, match)
                    for (param, value) in bond_params.items():
                        newname = v2_bond_map.get(param.replace('_', '-'))
                        if newname is None:
                            continue
                        bond_config.update({newname: value})

                if len(bond_config) > 0:
                    bond.update({'parameters': bond_config})
                slave_interfaces = ifcfg.get('bond-slaves')
                if slave_interfaces == 'none':
                    _extract_bond_slaves_by_name(interfaces, bond, ifname)
                _extract_addresses(ifcfg, bond)
                bonds.update({ifname: bond})

            elif if_type == 'bridge':
                # required_keys = ['name', 'bridge_ports']
                ports = sorted(copy.copy(ifcfg.get('bridge_ports')))
                bridge = {
                    'interfaces': ports,
                }
                # extract bridge params and drop the bridge prefix as it's
                # redundent in v2 yaml format
                match_prefix = 'bridge_'
                params = _get_params_dict_by_match(ifcfg, match_prefix)
                br_config = {}

                # v2 yaml uses different names for the keys
                # and at least one value format change
                v2_bridge_map = NET_CONFIG_TO_V2.get('bridge')
                for (param, value) in params.items():
                    newname = v2_bridge_map.get(param)
                    if newname is None:
                        continue
                    br_config.update({newname: value})
                    if newname in ['path-cost', 'port-priority']:
                        # <interface> <value> -> <interface>: int(<value>)
                        newvalue = {}
                        for val in value:
                            (port, portval) = val.split()
                            newvalue[port] = int(portval)
                        br_config.update({newname: newvalue})

                if len(br_config) > 0:
                    bridge.update({'parameters': br_config})
                _extract_addresses(ifcfg, bridge)
                bridges.update({ifname: bridge})

            elif if_type == 'vlan':
                # required_keys = ['name', 'vlan_id', 'vlan-raw-device']
                vlan = {
                    'id': ifcfg.get('vlan_id'),
                    'link': ifcfg.get('vlan-raw-device')
                }
                macaddr = ifcfg.get('mac_address', None)
                if macaddr is not None:
                    vlan['macaddress'] = macaddr.lower()
                _extract_addresses(ifcfg, vlan)
                vlans.update({ifname: vlan})

        # inject global nameserver values under each all interface which
        # has addresses and do not already have a DNS configuration
        if nameservers or searchdomains:
            nscfg = {'addresses': nameservers, 'search': searchdomains}
            for section in [ethernets, wifis, bonds, bridges, vlans]:
                for _name, cfg in section.items():
                    if 'nameservers' in cfg or 'addresses' not in cfg:
                        continue
                    cfg.update({'nameservers': nscfg})

        # workaround yaml dictionary key sorting when dumping
        def _render_section(name, section):
            if section:
                dump = util.yaml_dumps({name: section},
                                       explicit_start=False,
                                       explicit_end=False)
                txt = util.indent(dump, ' ' * 4)
                return [txt]
            return []

        content.append("network:\n    version: 2\n")
        content += _render_section('ethernets', ethernets)
        content += _render_section('wifis', wifis)
        content += _render_section('bonds', bonds)
        content += _render_section('bridges', bridges)
        content += _render_section('vlans', vlans)

        return "".join(content)


def available(target=None):
    expected = ['netplan']
    search = ['/usr/sbin', '/sbin']
    for p in expected:
        if not util.which(p, search=search, target=target):
            return False
    return True


def network_state_to_netplan(network_state, header=None):
    # render the provided network state, return a string of equivalent eni
    netplan_path = 'etc/network/50-cloud-init.yaml'
    renderer = Renderer({
        'netplan_path': netplan_path,
        'netplan_header': header,
    })
    if not header:
        header = ""
    if not header.endswith("\n"):
        header += "\n"
    contents = renderer._render_content(network_state)
    return header + contents

# vi: ts=4 expandtab