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60f067b4 JS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/socket.h> | |
23 | #include <linux/if.h> | |
24 | ||
25 | #include "conf-parser.h" | |
26 | #include "path-util.h" | |
27 | #include "networkd.h" | |
5eef597e MP |
28 | #include "networkd-netdev.h" |
29 | #include "networkd-link.h" | |
60f067b4 JS |
30 | #include "network-internal.h" |
31 | #include "libudev-private.h" | |
32 | #include "udev-util.h" | |
33 | #include "rtnl-util.h" | |
34 | #include "mkdir.h" | |
35 | #include "virt.h" | |
36 | ||
37 | #include "sd-rtnl.h" | |
38 | ||
39 | const char* const network_dirs[] = { | |
40 | "/etc/systemd/network", | |
41 | "/run/systemd/network", | |
42 | "/usr/lib/systemd/network", | |
43 | #ifdef HAVE_SPLIT_USR | |
44 | "/lib/systemd/network", | |
45 | #endif | |
46 | NULL}; | |
47 | ||
e842803a MB |
48 | static int setup_default_address_pool(Manager *m) { |
49 | AddressPool *p; | |
50 | int r; | |
51 | ||
52 | assert(m); | |
53 | ||
54 | /* Add in the well-known private address ranges. */ | |
55 | ||
56 | r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7); | |
57 | if (r < 0) | |
58 | return r; | |
59 | ||
60 | r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16); | |
61 | if (r < 0) | |
62 | return r; | |
63 | ||
64 | r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12); | |
65 | if (r < 0) | |
66 | return r; | |
67 | ||
68 | r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8); | |
69 | if (r < 0) | |
70 | return r; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
60f067b4 JS |
75 | int manager_new(Manager **ret) { |
76 | _cleanup_manager_free_ Manager *m = NULL; | |
77 | int r; | |
78 | ||
79 | m = new0(Manager, 1); | |
80 | if (!m) | |
81 | return -ENOMEM; | |
82 | ||
83 | m->state_file = strdup("/run/systemd/netif/state"); | |
84 | if (!m->state_file) | |
85 | return -ENOMEM; | |
86 | ||
87 | r = sd_event_default(&m->event); | |
88 | if (r < 0) | |
89 | return r; | |
90 | ||
91 | sd_event_set_watchdog(m->event, true); | |
92 | ||
5eef597e MP |
93 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); |
94 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
95 | ||
60f067b4 JS |
96 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, |
97 | RTNLGRP_IPV6_IFADDR); | |
98 | if (r < 0) | |
99 | return r; | |
100 | ||
101 | r = sd_bus_default_system(&m->bus); | |
102 | if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */ | |
103 | return r; | |
104 | ||
60f067b4 JS |
105 | /* udev does not initialize devices inside containers, |
106 | * so we rely on them being already initialized before | |
107 | * entering the container */ | |
108 | if (detect_container(NULL) <= 0) { | |
109 | m->udev = udev_new(); | |
110 | if (!m->udev) | |
111 | return -ENOMEM; | |
112 | ||
113 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); | |
114 | if (!m->udev_monitor) | |
115 | return -ENOMEM; | |
116 | } | |
117 | ||
5eef597e | 118 | m->netdevs = hashmap_new(&string_hash_ops); |
60f067b4 JS |
119 | if (!m->netdevs) |
120 | return -ENOMEM; | |
121 | ||
122 | LIST_HEAD_INIT(m->networks); | |
123 | ||
e842803a MB |
124 | r = setup_default_address_pool(m); |
125 | if (r < 0) | |
126 | return r; | |
127 | ||
60f067b4 JS |
128 | *ret = m; |
129 | m = NULL; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | void manager_free(Manager *m) { | |
135 | Network *network; | |
136 | NetDev *netdev; | |
137 | Link *link; | |
e842803a | 138 | AddressPool *pool; |
60f067b4 JS |
139 | |
140 | if (!m) | |
141 | return; | |
142 | ||
143 | free(m->state_file); | |
144 | ||
145 | udev_monitor_unref(m->udev_monitor); | |
146 | udev_unref(m->udev); | |
147 | sd_bus_unref(m->bus); | |
148 | sd_event_source_unref(m->udev_event_source); | |
60f067b4 JS |
149 | sd_event_unref(m->event); |
150 | ||
151 | while ((link = hashmap_first(m->links))) | |
152 | link_unref(link); | |
153 | hashmap_free(m->links); | |
154 | ||
155 | while ((network = m->networks)) | |
156 | network_free(network); | |
157 | ||
158 | while ((netdev = hashmap_first(m->netdevs))) | |
159 | netdev_unref(netdev); | |
160 | hashmap_free(m->netdevs); | |
161 | ||
e842803a MB |
162 | while ((pool = m->address_pools)) |
163 | address_pool_free(pool); | |
164 | ||
60f067b4 JS |
165 | sd_rtnl_unref(m->rtnl); |
166 | ||
167 | free(m); | |
168 | } | |
169 | ||
170 | int manager_load_config(Manager *m) { | |
171 | int r; | |
172 | ||
173 | /* update timestamp */ | |
174 | paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true); | |
175 | ||
176 | r = netdev_load(m); | |
177 | if (r < 0) | |
178 | return r; | |
179 | ||
180 | r = network_load(m); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | bool manager_should_reload(Manager *m) { | |
188 | return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false); | |
189 | } | |
190 | ||
191 | static int manager_udev_process_link(Manager *m, struct udev_device *device) { | |
192 | Link *link = NULL; | |
193 | int r, ifindex; | |
194 | ||
195 | assert(m); | |
196 | assert(device); | |
197 | ||
198 | if (!streq_ptr(udev_device_get_action(device), "add")) | |
199 | return 0; | |
200 | ||
201 | ifindex = udev_device_get_ifindex(device); | |
202 | if (ifindex <= 0) { | |
203 | log_debug("ignoring udev ADD event for device with invalid ifindex"); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | r = link_get(m, ifindex, &link); | |
208 | if (r == -ENODEV) | |
209 | return 0; | |
210 | else if (r < 0) | |
211 | return r; | |
212 | ||
213 | r = link_initialized(link, device); | |
214 | if (r < 0) | |
215 | return r; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { | |
221 | Manager *m = userdata; | |
222 | Link *link = NULL; | |
223 | NetDev *netdev = NULL; | |
224 | uint16_t type; | |
5eef597e | 225 | const char *name; |
60f067b4 JS |
226 | int r, ifindex; |
227 | ||
228 | assert(rtnl); | |
229 | assert(message); | |
230 | assert(m); | |
231 | ||
232 | r = sd_rtnl_message_get_type(message, &type); | |
233 | if (r < 0) { | |
234 | log_warning("rtnl: could not get message type"); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | r = sd_rtnl_message_link_get_ifindex(message, &ifindex); | |
239 | if (r < 0 || ifindex <= 0) { | |
240 | log_warning("rtnl: received link message without valid ifindex"); | |
241 | return 0; | |
242 | } else | |
243 | link_get(m, ifindex, &link); | |
244 | ||
245 | r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name); | |
246 | if (r < 0 || !name) { | |
247 | log_warning("rtnl: received link message without valid ifname"); | |
248 | return 0; | |
249 | } else | |
250 | netdev_get(m, name, &netdev); | |
251 | ||
252 | switch (type) { | |
253 | case RTM_NEWLINK: | |
254 | if (!link) { | |
255 | /* link is new, so add it */ | |
256 | r = link_add(m, message, &link); | |
257 | if (r < 0) { | |
e842803a MB |
258 | log_debug("could not add new link: %s", |
259 | strerror(-r)); | |
60f067b4 JS |
260 | return 0; |
261 | } | |
262 | } | |
263 | ||
264 | if (netdev) { | |
265 | /* netdev exists, so make sure the ifindex matches */ | |
266 | r = netdev_set_ifindex(netdev, message); | |
267 | if (r < 0) { | |
268 | log_debug("could not set ifindex on netdev"); | |
269 | return 0; | |
270 | } | |
271 | } | |
272 | ||
273 | r = link_update(link, message); | |
274 | if (r < 0) | |
275 | return 0; | |
276 | ||
277 | break; | |
278 | ||
279 | case RTM_DELLINK: | |
280 | link_drop(link); | |
281 | netdev_drop(netdev); | |
282 | ||
283 | break; | |
284 | ||
285 | default: | |
286 | assert_not_reached("Received invalid RTNL message type."); | |
287 | } | |
288 | ||
289 | return 1; | |
290 | } | |
291 | ||
292 | int manager_rtnl_enumerate_links(Manager *m) { | |
293 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
294 | sd_rtnl_message *link; | |
295 | int r, k; | |
296 | ||
297 | assert(m); | |
298 | assert(m->rtnl); | |
299 | ||
300 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
301 | if (r < 0) | |
302 | return r; | |
303 | ||
304 | r = sd_rtnl_message_request_dump(req, true); | |
305 | if (r < 0) | |
306 | return r; | |
307 | ||
308 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); | |
309 | if (r < 0) | |
310 | return r; | |
311 | ||
312 | for (link = reply; link; link = sd_rtnl_message_next(link)) { | |
313 | uint16_t type; | |
314 | ||
315 | k = sd_rtnl_message_get_type(link, &type); | |
316 | if (k < 0) | |
317 | return k; | |
318 | ||
319 | if (type != RTM_NEWLINK) | |
320 | continue; | |
321 | ||
322 | k = manager_rtnl_process_link(m->rtnl, link, m); | |
323 | if (k < 0) | |
324 | r = k; | |
325 | } | |
326 | ||
327 | return r; | |
328 | } | |
329 | ||
330 | static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
331 | Manager *m = userdata; | |
332 | struct udev_monitor *monitor = m->udev_monitor; | |
333 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
334 | ||
335 | device = udev_monitor_receive_device(monitor); | |
336 | if (!device) | |
337 | return -ENOMEM; | |
338 | ||
339 | manager_udev_process_link(m, device); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | int manager_udev_listen(Manager *m) { | |
344 | int r; | |
345 | ||
346 | if (detect_container(NULL) > 0) | |
347 | return 0; | |
348 | ||
349 | assert(m->udev_monitor); | |
350 | ||
351 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); | |
352 | if (r < 0) { | |
353 | log_error("Could not add udev monitor filter: %s", strerror(-r)); | |
354 | return r; | |
355 | } | |
356 | ||
357 | r = udev_monitor_enable_receiving(m->udev_monitor); | |
358 | if (r < 0) { | |
359 | log_error("Could not enable udev monitor"); | |
360 | return r; | |
361 | } | |
362 | ||
363 | r = sd_event_add_io(m->event, | |
364 | &m->udev_event_source, | |
365 | udev_monitor_get_fd(m->udev_monitor), | |
366 | EPOLLIN, manager_dispatch_link_udev, | |
367 | m); | |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
5eef597e MP |
371 | r = sd_event_source_set_name(m->udev_event_source, "networkd-udev"); |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
60f067b4 JS |
375 | return 0; |
376 | } | |
377 | ||
378 | int manager_rtnl_listen(Manager *m) { | |
379 | int r; | |
380 | ||
e842803a MB |
381 | assert(m); |
382 | ||
60f067b4 JS |
383 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); |
384 | if (r < 0) | |
385 | return r; | |
386 | ||
387 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); | |
388 | if (r < 0) | |
389 | return r; | |
390 | ||
391 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m); | |
392 | if (r < 0) | |
393 | return r; | |
394 | ||
395 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m); | |
396 | if (r < 0) | |
397 | return r; | |
398 | ||
399 | r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m); | |
400 | if (r < 0) | |
401 | return r; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | int manager_bus_listen(Manager *m) { | |
407 | int r; | |
408 | ||
409 | assert(m->event); | |
410 | ||
411 | if (!m->bus) /* TODO: drop when we can rely on kdbus */ | |
412 | return 0; | |
413 | ||
414 | r = sd_bus_attach_event(m->bus, m->event, 0); | |
415 | if (r < 0) | |
416 | return r; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
5eef597e MP |
421 | static int set_put_in_addr(Set *s, const struct in_addr *address) { |
422 | char *p; | |
423 | int r; | |
424 | ||
425 | assert(s); | |
426 | ||
427 | r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p); | |
428 | if (r < 0) | |
429 | return r; | |
430 | ||
431 | r = set_consume(s, p); | |
432 | if (r == -EEXIST) | |
433 | return 0; | |
434 | ||
435 | return r; | |
436 | } | |
437 | ||
438 | static int set_put_in_addrv(Set *s, const struct in_addr *addresses, int n) { | |
439 | int r, i, c = 0; | |
440 | ||
441 | assert(s); | |
442 | assert(n <= 0 || addresses); | |
443 | ||
444 | for (i = 0; i < n; i++) { | |
445 | r = set_put_in_addr(s, addresses+i); | |
446 | if (r < 0) | |
447 | return r; | |
448 | ||
449 | c += r; | |
450 | } | |
451 | ||
452 | return c; | |
453 | } | |
454 | ||
455 | static void print_string_set(FILE *f, const char *field, Set *s) { | |
456 | bool space = false; | |
457 | Iterator i; | |
458 | char *p; | |
459 | ||
460 | if (set_isempty(s)) | |
461 | return; | |
462 | ||
463 | fputs(field, f); | |
464 | ||
465 | SET_FOREACH(p, s, i) { | |
466 | if (space) | |
467 | fputc(' ', f); | |
468 | fputs(p, f); | |
469 | space = true; | |
470 | } | |
471 | fputc('\n', f); | |
472 | } | |
473 | ||
60f067b4 | 474 | int manager_save(Manager *m) { |
5eef597e | 475 | _cleanup_set_free_free_ Set *dns = NULL, *ntp = NULL, *domains = NULL; |
60f067b4 JS |
476 | Link *link; |
477 | Iterator i; | |
478 | _cleanup_free_ char *temp_path = NULL; | |
479 | _cleanup_fclose_ FILE *f = NULL; | |
5eef597e | 480 | LinkOperationalState operstate = LINK_OPERSTATE_OFF; |
60f067b4 JS |
481 | const char *operstate_str; |
482 | int r; | |
483 | ||
484 | assert(m); | |
485 | assert(m->state_file); | |
486 | ||
5eef597e MP |
487 | /* We add all NTP and DNS server to a set, to filter out duplicates */ |
488 | dns = set_new(&string_hash_ops); | |
489 | if (!dns) | |
490 | return -ENOMEM; | |
491 | ||
492 | ntp = set_new(&string_hash_ops); | |
493 | if (!ntp) | |
494 | return -ENOMEM; | |
495 | ||
496 | domains = set_new(&string_hash_ops); | |
497 | if (!domains) | |
498 | return -ENOMEM; | |
499 | ||
60f067b4 JS |
500 | HASHMAP_FOREACH(link, m->links, i) { |
501 | if (link->flags & IFF_LOOPBACK) | |
502 | continue; | |
503 | ||
504 | if (link->operstate > operstate) | |
505 | operstate = link->operstate; | |
5eef597e MP |
506 | |
507 | if (!link->network) | |
508 | continue; | |
509 | ||
510 | /* First add the static configured entries */ | |
511 | r = set_put_strdupv(dns, link->network->dns); | |
512 | if (r < 0) | |
513 | return r; | |
514 | ||
515 | r = set_put_strdupv(ntp, link->network->ntp); | |
516 | if (r < 0) | |
517 | return r; | |
518 | ||
519 | r = set_put_strdupv(domains, link->network->domains); | |
520 | if (r < 0) | |
521 | return r; | |
522 | ||
523 | if (!link->dhcp_lease) | |
524 | continue; | |
525 | ||
526 | /* Secondly, add the entries acquired via DHCP */ | |
527 | if (link->network->dhcp_dns) { | |
528 | const struct in_addr *addresses; | |
529 | ||
530 | r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); | |
531 | if (r > 0) { | |
532 | r = set_put_in_addrv(dns, addresses, r); | |
533 | if (r < 0) | |
534 | return r; | |
535 | } else if (r < 0 && r != -ENOENT) | |
536 | return r; | |
537 | } | |
538 | ||
539 | if (link->network->dhcp_ntp) { | |
540 | const struct in_addr *addresses; | |
541 | ||
542 | r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); | |
543 | if (r > 0) { | |
544 | r = set_put_in_addrv(ntp, addresses, r); | |
545 | if (r < 0) | |
546 | return r; | |
547 | } else if (r < 0 && r != -ENOENT) | |
548 | return r; | |
549 | } | |
550 | ||
551 | if (link->network->dhcp_domains) { | |
552 | const char *domainname; | |
553 | ||
554 | r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); | |
555 | if (r >= 0) { | |
556 | r = set_put_strdup(domains, domainname); | |
557 | if (r < 0) | |
558 | return r; | |
559 | } else if (r != -ENOENT) | |
560 | return r; | |
561 | } | |
60f067b4 JS |
562 | } |
563 | ||
564 | operstate_str = link_operstate_to_string(operstate); | |
565 | assert(operstate_str); | |
566 | ||
567 | r = fopen_temporary(m->state_file, &f, &temp_path); | |
568 | if (r < 0) | |
5eef597e | 569 | return r; |
60f067b4 JS |
570 | |
571 | fchmod(fileno(f), 0644); | |
572 | ||
573 | fprintf(f, | |
574 | "# This is private data. Do not parse.\n" | |
575 | "OPER_STATE=%s\n", operstate_str); | |
576 | ||
5eef597e MP |
577 | print_string_set(f, "DNS=", dns); |
578 | print_string_set(f, "NTP=", ntp); | |
579 | print_string_set(f, "DOMAINS=", domains); | |
580 | ||
581 | r = fflush_and_check(f); | |
582 | if (r < 0) | |
583 | goto fail; | |
60f067b4 | 584 | |
5eef597e | 585 | if (rename(temp_path, m->state_file) < 0) { |
60f067b4 | 586 | r = -errno; |
5eef597e | 587 | goto fail; |
60f067b4 JS |
588 | } |
589 | ||
5eef597e | 590 | return 0; |
60f067b4 | 591 | |
5eef597e MP |
592 | fail: |
593 | log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r)); | |
594 | unlink(m->state_file); | |
595 | unlink(temp_path); | |
60f067b4 JS |
596 | return r; |
597 | } | |
e842803a | 598 | |
5eef597e | 599 | int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) { |
e842803a MB |
600 | AddressPool *p; |
601 | int r; | |
602 | ||
603 | assert(m); | |
604 | assert(prefixlen > 0); | |
605 | assert(found); | |
606 | ||
607 | LIST_FOREACH(address_pools, p, m->address_pools) { | |
608 | if (p->family != family) | |
609 | continue; | |
610 | ||
611 | r = address_pool_acquire(p, prefixlen, found); | |
612 | if (r != 0) | |
613 | return r; | |
614 | } | |
615 | ||
616 | return 0; | |
617 | } |