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f579559b TG |
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 | ||
3bef724f | 22 | #include <resolv.h> |
bbf7c048 | 23 | #include <linux/if.h> |
3bef724f | 24 | |
f579559b TG |
25 | #include "path-util.h" |
26 | #include "networkd.h" | |
27 | #include "libudev-private.h" | |
7b77ed8c | 28 | #include "udev-util.h" |
50add290 | 29 | #include "rtnl-util.h" |
3bef724f | 30 | #include "mkdir.h" |
60ad0c85 | 31 | #include "virt.h" |
f579559b | 32 | |
505f8da7 TG |
33 | #include "sd-rtnl.h" |
34 | ||
2ad8416d ZJS |
35 | const char* const network_dirs[] = { |
36 | "/etc/systemd/network", | |
37 | "/run/systemd/network", | |
38 | "/usr/lib/systemd/network", | |
eed0eee8 | 39 | #ifdef HAVE_SPLIT_USR |
2ad8416d ZJS |
40 | "/lib/systemd/network", |
41 | #endif | |
42 | NULL}; | |
43 | ||
0c2f9b84 TG |
44 | static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) { |
45 | Manager *m = userdata; | |
46 | ||
47 | assert(m); | |
48 | ||
49 | log_received_signal(LOG_INFO, si); | |
50 | ||
51 | sd_event_exit(m->event, 0); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int setup_signals(Manager *m) { | |
56 | sigset_t mask; | |
57 | int r; | |
58 | ||
59 | assert(m); | |
60 | ||
61 | assert_se(sigemptyset(&mask) == 0); | |
62 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
63 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
64 | ||
65 | r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m); | |
66 | if (r < 0) | |
67 | return r; | |
68 | ||
69 | r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m); | |
70 | if (r < 0) | |
71 | return r; | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
f579559b TG |
76 | int manager_new(Manager **ret) { |
77 | _cleanup_manager_free_ Manager *m = NULL; | |
78 | int r; | |
79 | ||
80 | m = new0(Manager, 1); | |
81 | if (!m) | |
82 | return -ENOMEM; | |
83 | ||
bbf7c048 TG |
84 | m->state_file = strdup("/run/systemd/network/state"); |
85 | if (!m->state_file) | |
86 | return -ENOMEM; | |
87 | ||
afc6adb5 | 88 | r = sd_event_default(&m->event); |
f579559b TG |
89 | if (r < 0) |
90 | return r; | |
91 | ||
cde93897 LP |
92 | sd_event_set_watchdog(m->event, true); |
93 | ||
897e184c TG |
94 | r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, |
95 | RTNLGRP_IPV6_IFADDR); | |
f579559b TG |
96 | if (r < 0) |
97 | return r; | |
98 | ||
1346b1f0 | 99 | r = sd_bus_default_system(&m->bus); |
bcbca829 | 100 | if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */ |
1346b1f0 TG |
101 | return r; |
102 | ||
0c2f9b84 TG |
103 | r = setup_signals(m); |
104 | if (r < 0) | |
105 | return r; | |
106 | ||
60ad0c85 TG |
107 | /* udev does not initialize devices inside containers, |
108 | * so we rely on them being already initialized before | |
109 | * entering the container */ | |
505f8da7 TG |
110 | if (detect_container(NULL) <= 0) { |
111 | m->udev = udev_new(); | |
112 | if (!m->udev) | |
60ad0c85 | 113 | return -ENOMEM; |
505f8da7 | 114 | |
60ad0c85 TG |
115 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
116 | if (!m->udev_monitor) | |
117 | return -ENOMEM; | |
118 | } | |
f579559b TG |
119 | |
120 | m->links = hashmap_new(uint64_hash_func, uint64_compare_func); | |
121 | if (!m->links) | |
122 | return -ENOMEM; | |
123 | ||
52433f6b TG |
124 | m->netdevs = hashmap_new(string_hash_func, string_compare_func); |
125 | if (!m->netdevs) | |
02b59d57 TG |
126 | return -ENOMEM; |
127 | ||
f579559b TG |
128 | LIST_HEAD_INIT(m->networks); |
129 | ||
f579559b TG |
130 | *ret = m; |
131 | m = NULL; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | void manager_free(Manager *m) { | |
0617ffab | 137 | Network *network; |
1a436809 | 138 | NetDev *netdev; |
0617ffab TG |
139 | Link *link; |
140 | ||
624b5a63 TG |
141 | if (!m) |
142 | return; | |
143 | ||
bbf7c048 TG |
144 | free(m->state_file); |
145 | ||
f579559b TG |
146 | udev_monitor_unref(m->udev_monitor); |
147 | udev_unref(m->udev); | |
1346b1f0 | 148 | sd_bus_unref(m->bus); |
f579559b | 149 | sd_event_source_unref(m->udev_event_source); |
0c2f9b84 TG |
150 | sd_event_source_unref(m->sigterm_event_source); |
151 | sd_event_source_unref(m->sigint_event_source); | |
f579559b | 152 | sd_event_unref(m->event); |
0617ffab | 153 | |
0617ffab | 154 | while ((link = hashmap_first(m->links))) |
14b746f7 | 155 | link_unref(link); |
f579559b | 156 | hashmap_free(m->links); |
0617ffab | 157 | |
2292547a TG |
158 | while ((network = m->networks)) |
159 | network_free(network); | |
160 | ||
52433f6b | 161 | while ((netdev = hashmap_first(m->netdevs))) |
14b746f7 | 162 | netdev_unref(netdev); |
52433f6b | 163 | hashmap_free(m->netdevs); |
02b59d57 | 164 | |
f579559b TG |
165 | sd_rtnl_unref(m->rtnl); |
166 | ||
167 | free(m); | |
168 | } | |
169 | ||
02b59d57 TG |
170 | int manager_load_config(Manager *m) { |
171 | int r; | |
172 | ||
173 | /* update timestamp */ | |
2ad8416d | 174 | paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true); |
02b59d57 | 175 | |
52433f6b | 176 | r = netdev_load(m); |
02b59d57 TG |
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) { | |
2ad8416d | 188 | return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false); |
02b59d57 TG |
189 | } |
190 | ||
505f8da7 | 191 | static int manager_udev_process_link(Manager *m, struct udev_device *device) { |
11a7f229 | 192 | Link *link = NULL; |
667fcc6d | 193 | int r, ifindex; |
f579559b | 194 | |
11a7f229 TG |
195 | assert(m); |
196 | assert(device); | |
f579559b | 197 | |
505f8da7 TG |
198 | if (!streq_ptr(udev_device_get_action(device), "add")) |
199 | return 0; | |
200 | ||
667fcc6d TG |
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 | } | |
505f8da7 | 206 | |
667fcc6d TG |
207 | r = link_get(m, ifindex, &link); |
208 | if (r == -ENODEV) | |
505f8da7 | 209 | return 0; |
667fcc6d TG |
210 | else if (r < 0) |
211 | return r; | |
505f8da7 TG |
212 | |
213 | r = link_initialized(link, device); | |
214 | if (r < 0) | |
215 | return r; | |
11a7f229 | 216 | |
505f8da7 TG |
217 | return 0; |
218 | } | |
f579559b | 219 | |
505f8da7 TG |
220 | static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { |
221 | Manager *m = userdata; | |
222 | Link *link = NULL; | |
4d473d5d | 223 | NetDev *netdev = NULL; |
f2236469 | 224 | uint16_t type; |
505f8da7 TG |
225 | char *name; |
226 | int r, ifindex; | |
f579559b | 227 | |
505f8da7 TG |
228 | assert(rtnl); |
229 | assert(message); | |
f579559b TG |
230 | assert(m); |
231 | ||
f2236469 TG |
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 | ||
505f8da7 TG |
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; | |
4d473d5d TG |
242 | } else |
243 | link_get(m, ifindex, &link); | |
f579559b | 244 | |
505f8da7 | 245 | r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name); |
4d473d5d | 246 | if (r < 0 || !name) { |
505f8da7 | 247 | log_warning("rtnl: received link message without valid ifname"); |
4d473d5d TG |
248 | return 0; |
249 | } else | |
f2236469 | 250 | netdev_get(m, name, &netdev); |
4d473d5d TG |
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) { | |
258 | log_debug("could not add new link"); | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | ||
263 | if (netdev) { | |
264 | /* netdev exists, so make sure the ifindex matches */ | |
505f8da7 TG |
265 | r = netdev_set_ifindex(netdev, message); |
266 | if (r < 0) { | |
267 | log_debug("could not set ifindex on netdev"); | |
268 | return 0; | |
269 | } | |
270 | } | |
e1202047 | 271 | |
f2236469 TG |
272 | r = link_update(link, message); |
273 | if (r < 0) | |
274 | return 0; | |
4d473d5d TG |
275 | |
276 | break; | |
277 | ||
278 | case RTM_DELLINK: | |
279 | link_drop(link); | |
280 | netdev_drop(netdev); | |
281 | ||
282 | break; | |
283 | ||
284 | default: | |
285 | assert_not_reached("Received invalid RTNL message type."); | |
f2236469 | 286 | } |
505f8da7 TG |
287 | |
288 | return 1; | |
289 | } | |
290 | ||
291 | int manager_rtnl_enumerate_links(Manager *m) { | |
292 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
293 | sd_rtnl_message *link; | |
294 | int r, k; | |
295 | ||
296 | assert(m); | |
297 | assert(m->rtnl); | |
298 | ||
299 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
300 | if (r < 0) | |
301 | return r; | |
302 | ||
303 | r = sd_rtnl_message_request_dump(req, true); | |
f579559b | 304 | if (r < 0) |
bf5332d2 | 305 | return r; |
f579559b | 306 | |
505f8da7 TG |
307 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); |
308 | if (r < 0) | |
309 | return r; | |
f579559b | 310 | |
505f8da7 TG |
311 | for (link = reply; link; link = sd_rtnl_message_next(link)) { |
312 | uint16_t type; | |
313 | ||
314 | k = sd_rtnl_message_get_type(link, &type); | |
315 | if (k < 0) | |
316 | return k; | |
317 | ||
318 | if (type != RTM_NEWLINK) | |
319 | continue; | |
f579559b | 320 | |
505f8da7 | 321 | k = manager_rtnl_process_link(m->rtnl, link, m); |
f579559b TG |
322 | if (k < 0) |
323 | r = k; | |
324 | } | |
325 | ||
f579559b TG |
326 | return r; |
327 | } | |
328 | ||
329 | static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
330 | Manager *m = userdata; | |
331 | struct udev_monitor *monitor = m->udev_monitor; | |
7b77ed8c | 332 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
f579559b TG |
333 | |
334 | device = udev_monitor_receive_device(monitor); | |
335 | if (!device) | |
336 | return -ENOMEM; | |
337 | ||
505f8da7 | 338 | manager_udev_process_link(m, device); |
f579559b TG |
339 | return 0; |
340 | } | |
341 | ||
342 | int manager_udev_listen(Manager *m) { | |
343 | int r; | |
344 | ||
505f8da7 TG |
345 | if (detect_container(NULL) > 0) |
346 | return 0; | |
347 | ||
348 | assert(m->udev_monitor); | |
349 | ||
f579559b TG |
350 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); |
351 | if (r < 0) { | |
352 | log_error("Could not add udev monitor filter: %s", strerror(-r)); | |
353 | return r; | |
354 | } | |
355 | ||
f579559b TG |
356 | r = udev_monitor_enable_receiving(m->udev_monitor); |
357 | if (r < 0) { | |
358 | log_error("Could not enable udev monitor"); | |
359 | return r; | |
360 | } | |
361 | ||
362 | r = sd_event_add_io(m->event, | |
151b9b96 | 363 | &m->udev_event_source, |
f579559b TG |
364 | udev_monitor_get_fd(m->udev_monitor), |
365 | EPOLLIN, manager_dispatch_link_udev, | |
151b9b96 | 366 | m); |
f579559b TG |
367 | if (r < 0) |
368 | return r; | |
369 | ||
370 | return 0; | |
371 | } | |
f882c247 TG |
372 | |
373 | int manager_rtnl_listen(Manager *m) { | |
374 | int r; | |
375 | ||
376 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
dd3efc09 TG |
380 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); |
381 | if (r < 0) | |
382 | return r; | |
383 | ||
f2236469 TG |
384 | r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m); |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
f882c247 TG |
388 | return 0; |
389 | } | |
3bef724f | 390 | |
1346b1f0 TG |
391 | int manager_bus_listen(Manager *m) { |
392 | int r; | |
393 | ||
bcbca829 TG |
394 | assert(m->event); |
395 | ||
396 | if (!m->bus) /* TODO: drop when we can rely on kdbus */ | |
397 | return 0; | |
398 | ||
1346b1f0 TG |
399 | r = sd_bus_attach_event(m->bus, m->event, 0); |
400 | if (r < 0) | |
401 | return r; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
3bef724f TG |
406 | static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) { |
407 | char buf[INET6_ADDRSTRLEN]; | |
408 | const char *address; | |
409 | ||
410 | address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN); | |
411 | if (!address) { | |
412 | log_warning("Invalid DNS address. Ignoring."); | |
413 | return; | |
414 | } | |
415 | ||
416 | if (*count == MAXNS) | |
f3621dec TG |
417 | fputs("# Too many DNS servers configured, the following entries " |
418 | "will be ignored\n", f); | |
3bef724f TG |
419 | |
420 | fprintf(f, "nameserver %s\n", address); | |
421 | ||
422 | (*count) ++; | |
423 | } | |
424 | ||
425 | int manager_update_resolv_conf(Manager *m) { | |
426 | _cleanup_free_ char *temp_path = NULL; | |
427 | _cleanup_fclose_ FILE *f = NULL; | |
428 | Link *link; | |
429 | Iterator i; | |
430 | unsigned count = 0; | |
039ebe6a | 431 | const char *domainname = NULL; |
3bef724f TG |
432 | int r; |
433 | ||
434 | assert(m); | |
435 | ||
3bef724f TG |
436 | r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path); |
437 | if (r < 0) | |
438 | return r; | |
439 | ||
440 | fchmod(fileno(f), 0644); | |
441 | ||
b2ad8a16 TG |
442 | fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n" |
443 | "# Third party programs must not access this file directly, but\n" | |
444 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
445 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
446 | "# static file or a different symlink.\n\n", f); | |
3bef724f TG |
447 | |
448 | HASHMAP_FOREACH(link, m->links, i) { | |
a6cc569e | 449 | if (link->dhcp_lease) { |
7ae4ef6d TG |
450 | struct in_addr *nameservers; |
451 | size_t nameservers_size; | |
3bef724f | 452 | |
039ebe6a | 453 | if (link->network->dhcp_dns) { |
a6cc569e | 454 | r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size); |
039ebe6a TG |
455 | if (r >= 0) { |
456 | unsigned j; | |
3bef724f | 457 | |
039ebe6a TG |
458 | for (j = 0; j < nameservers_size; j++) |
459 | append_dns(f, &nameservers[j], AF_INET, &count); | |
460 | } | |
461 | } | |
462 | ||
463 | if (link->network->dhcp_domainname && !domainname) { | |
a6cc569e | 464 | r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); |
039ebe6a TG |
465 | if (r >= 0) |
466 | fprintf(f, "domain %s\n", domainname); | |
3bef724f TG |
467 | } |
468 | } | |
469 | } | |
470 | ||
06f021a8 TG |
471 | HASHMAP_FOREACH(link, m->links, i) { |
472 | if (link->network && link->network->dns) { | |
473 | Address *address; | |
474 | Iterator j; | |
475 | ||
476 | SET_FOREACH(address, link->network->dns, j) { | |
477 | append_dns(f, &address->in_addr.in, | |
478 | address->family, &count); | |
479 | } | |
480 | } | |
481 | } | |
3bef724f TG |
482 | |
483 | fflush(f); | |
484 | ||
485 | if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) { | |
486 | r = -errno; | |
487 | unlink("/run/systemd/network/resolv.conf"); | |
488 | unlink(temp_path); | |
489 | return r; | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
bbf7c048 TG |
494 | |
495 | int manager_save(Manager *m) { | |
496 | Link *link; | |
497 | Iterator i; | |
498 | _cleanup_free_ char *temp_path = NULL; | |
499 | _cleanup_fclose_ FILE *f = NULL; | |
500 | const char *oper_state = "unknown"; | |
86e6e5d1 | 501 | bool dormant = false, carrier = false; |
bbf7c048 TG |
502 | int r; |
503 | ||
504 | assert(m); | |
505 | assert(m->state_file); | |
506 | ||
507 | HASHMAP_FOREACH(link, m->links, i) { | |
508 | if (link->flags & IFF_LOOPBACK) | |
509 | continue; | |
510 | ||
511 | if (link_has_carrier(link->flags, link->operstate)) | |
512 | carrier = true; | |
513 | else if (link->operstate == IF_OPER_DORMANT) | |
514 | dormant = true; | |
515 | } | |
516 | ||
517 | if (carrier) | |
518 | oper_state = "carrier"; | |
519 | else if (dormant) | |
520 | oper_state = "dormant"; | |
521 | ||
522 | r = fopen_temporary(m->state_file, &f, &temp_path); | |
523 | if (r < 0) | |
524 | goto finish; | |
525 | ||
526 | fchmod(fileno(f), 0644); | |
527 | ||
528 | fprintf(f, | |
529 | "# This is private data. Do not parse.\n" | |
530 | "OPER_STATE=%s\n", oper_state); | |
531 | ||
532 | fflush(f); | |
533 | ||
534 | if (ferror(f) || rename(temp_path, m->state_file) < 0) { | |
535 | r = -errno; | |
536 | unlink(m->state_file); | |
537 | unlink(temp_path); | |
538 | } | |
539 | ||
540 | finish: | |
541 | if (r < 0) | |
542 | log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r)); | |
543 | ||
544 | return r; | |
545 | } |