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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 | ||
151b9b96 | 94 | r = sd_rtnl_open(&m->rtnl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR); |
f579559b TG |
95 | if (r < 0) |
96 | return r; | |
97 | ||
1346b1f0 | 98 | r = sd_bus_default_system(&m->bus); |
bcbca829 | 99 | if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */ |
1346b1f0 TG |
100 | return r; |
101 | ||
0c2f9b84 TG |
102 | r = setup_signals(m); |
103 | if (r < 0) | |
104 | return r; | |
105 | ||
60ad0c85 TG |
106 | /* udev does not initialize devices inside containers, |
107 | * so we rely on them being already initialized before | |
108 | * entering the container */ | |
505f8da7 TG |
109 | if (detect_container(NULL) <= 0) { |
110 | m->udev = udev_new(); | |
111 | if (!m->udev) | |
60ad0c85 | 112 | return -ENOMEM; |
505f8da7 | 113 | |
60ad0c85 TG |
114 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
115 | if (!m->udev_monitor) | |
116 | return -ENOMEM; | |
117 | } | |
f579559b TG |
118 | |
119 | m->links = hashmap_new(uint64_hash_func, uint64_compare_func); | |
120 | if (!m->links) | |
121 | return -ENOMEM; | |
122 | ||
52433f6b TG |
123 | m->netdevs = hashmap_new(string_hash_func, string_compare_func); |
124 | if (!m->netdevs) | |
02b59d57 TG |
125 | return -ENOMEM; |
126 | ||
f579559b TG |
127 | LIST_HEAD_INIT(m->networks); |
128 | ||
f579559b TG |
129 | *ret = m; |
130 | m = NULL; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | void manager_free(Manager *m) { | |
0617ffab | 136 | Network *network; |
1a436809 | 137 | NetDev *netdev; |
0617ffab TG |
138 | Link *link; |
139 | ||
624b5a63 TG |
140 | if (!m) |
141 | return; | |
142 | ||
bbf7c048 TG |
143 | free(m->state_file); |
144 | ||
f579559b TG |
145 | udev_monitor_unref(m->udev_monitor); |
146 | udev_unref(m->udev); | |
1346b1f0 | 147 | sd_bus_unref(m->bus); |
f579559b | 148 | sd_event_source_unref(m->udev_event_source); |
0c2f9b84 TG |
149 | sd_event_source_unref(m->sigterm_event_source); |
150 | sd_event_source_unref(m->sigint_event_source); | |
f579559b | 151 | sd_event_unref(m->event); |
0617ffab | 152 | |
0617ffab | 153 | while ((link = hashmap_first(m->links))) |
14b746f7 | 154 | link_unref(link); |
f579559b | 155 | hashmap_free(m->links); |
0617ffab | 156 | |
2292547a TG |
157 | while ((network = m->networks)) |
158 | network_free(network); | |
159 | ||
52433f6b | 160 | while ((netdev = hashmap_first(m->netdevs))) |
14b746f7 | 161 | netdev_unref(netdev); |
52433f6b | 162 | hashmap_free(m->netdevs); |
02b59d57 | 163 | |
f579559b TG |
164 | sd_rtnl_unref(m->rtnl); |
165 | ||
166 | free(m); | |
167 | } | |
168 | ||
02b59d57 TG |
169 | int manager_load_config(Manager *m) { |
170 | int r; | |
171 | ||
172 | /* update timestamp */ | |
2ad8416d | 173 | paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true); |
02b59d57 | 174 | |
52433f6b | 175 | r = netdev_load(m); |
02b59d57 TG |
176 | if (r < 0) |
177 | return r; | |
178 | ||
179 | r = network_load(m); | |
180 | if (r < 0) | |
181 | return r; | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | bool manager_should_reload(Manager *m) { | |
2ad8416d | 187 | return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false); |
02b59d57 TG |
188 | } |
189 | ||
505f8da7 | 190 | static int manager_udev_process_link(Manager *m, struct udev_device *device) { |
11a7f229 | 191 | Link *link = NULL; |
667fcc6d | 192 | int r, ifindex; |
f579559b | 193 | |
11a7f229 TG |
194 | assert(m); |
195 | assert(device); | |
f579559b | 196 | |
505f8da7 TG |
197 | if (!streq_ptr(udev_device_get_action(device), "add")) |
198 | return 0; | |
199 | ||
667fcc6d TG |
200 | ifindex = udev_device_get_ifindex(device); |
201 | if (ifindex <= 0) { | |
202 | log_debug("ignoring udev ADD event for device with invalid ifindex"); | |
203 | return 0; | |
204 | } | |
505f8da7 | 205 | |
667fcc6d TG |
206 | r = link_get(m, ifindex, &link); |
207 | if (r == -ENODEV) | |
505f8da7 | 208 | return 0; |
667fcc6d TG |
209 | else if (r < 0) |
210 | return r; | |
505f8da7 TG |
211 | |
212 | r = link_initialized(link, device); | |
213 | if (r < 0) | |
214 | return r; | |
11a7f229 | 215 | |
505f8da7 TG |
216 | return 0; |
217 | } | |
f579559b | 218 | |
505f8da7 TG |
219 | static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { |
220 | Manager *m = userdata; | |
221 | Link *link = NULL; | |
222 | char *name; | |
223 | int r, ifindex; | |
f579559b | 224 | |
505f8da7 TG |
225 | assert(rtnl); |
226 | assert(message); | |
f579559b TG |
227 | assert(m); |
228 | ||
505f8da7 TG |
229 | r = sd_rtnl_message_link_get_ifindex(message, &ifindex); |
230 | if (r < 0 || ifindex <= 0) { | |
231 | log_warning("rtnl: received link message without valid ifindex"); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | link_get(m, ifindex, &link); | |
236 | if (!link) { | |
237 | /* link is new, so add it */ | |
238 | r = link_add(m, message, &link); | |
239 | if (r < 0) { | |
240 | log_debug("could not add new link"); | |
241 | return 0; | |
242 | } | |
243 | } | |
f579559b | 244 | |
505f8da7 | 245 | r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name); |
f579559b | 246 | if (r < 0) |
505f8da7 TG |
247 | log_warning("rtnl: received link message without valid ifname"); |
248 | else { | |
249 | NetDev *netdev; | |
f579559b | 250 | |
505f8da7 TG |
251 | r = netdev_get(m, name, &netdev); |
252 | if (r >= 0) { | |
253 | r = netdev_set_ifindex(netdev, message); | |
254 | if (r < 0) { | |
255 | log_debug("could not set ifindex on netdev"); | |
256 | return 0; | |
257 | } | |
258 | } | |
60ad0c85 | 259 | } |
e1202047 | 260 | |
505f8da7 TG |
261 | r = link_update(link, message); |
262 | if (r < 0) | |
263 | return 0; | |
264 | ||
265 | return 1; | |
266 | } | |
267 | ||
268 | int manager_rtnl_enumerate_links(Manager *m) { | |
269 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
270 | sd_rtnl_message *link; | |
271 | int r, k; | |
272 | ||
273 | assert(m); | |
274 | assert(m->rtnl); | |
275 | ||
276 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
277 | if (r < 0) | |
278 | return r; | |
279 | ||
280 | r = sd_rtnl_message_request_dump(req, true); | |
f579559b | 281 | if (r < 0) |
bf5332d2 | 282 | return r; |
f579559b | 283 | |
505f8da7 TG |
284 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); |
285 | if (r < 0) | |
286 | return r; | |
f579559b | 287 | |
505f8da7 TG |
288 | for (link = reply; link; link = sd_rtnl_message_next(link)) { |
289 | uint16_t type; | |
290 | ||
291 | k = sd_rtnl_message_get_type(link, &type); | |
292 | if (k < 0) | |
293 | return k; | |
294 | ||
295 | if (type != RTM_NEWLINK) | |
296 | continue; | |
f579559b | 297 | |
505f8da7 | 298 | k = manager_rtnl_process_link(m->rtnl, link, m); |
f579559b TG |
299 | if (k < 0) |
300 | r = k; | |
301 | } | |
302 | ||
f579559b TG |
303 | return r; |
304 | } | |
305 | ||
306 | static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
307 | Manager *m = userdata; | |
308 | struct udev_monitor *monitor = m->udev_monitor; | |
7b77ed8c | 309 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
f579559b TG |
310 | |
311 | device = udev_monitor_receive_device(monitor); | |
312 | if (!device) | |
313 | return -ENOMEM; | |
314 | ||
505f8da7 | 315 | manager_udev_process_link(m, device); |
f579559b TG |
316 | return 0; |
317 | } | |
318 | ||
319 | int manager_udev_listen(Manager *m) { | |
320 | int r; | |
321 | ||
505f8da7 TG |
322 | if (detect_container(NULL) > 0) |
323 | return 0; | |
324 | ||
325 | assert(m->udev_monitor); | |
326 | ||
f579559b TG |
327 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); |
328 | if (r < 0) { | |
329 | log_error("Could not add udev monitor filter: %s", strerror(-r)); | |
330 | return r; | |
331 | } | |
332 | ||
f579559b TG |
333 | r = udev_monitor_enable_receiving(m->udev_monitor); |
334 | if (r < 0) { | |
335 | log_error("Could not enable udev monitor"); | |
336 | return r; | |
337 | } | |
338 | ||
339 | r = sd_event_add_io(m->event, | |
151b9b96 | 340 | &m->udev_event_source, |
f579559b TG |
341 | udev_monitor_get_fd(m->udev_monitor), |
342 | EPOLLIN, manager_dispatch_link_udev, | |
151b9b96 | 343 | m); |
f579559b TG |
344 | if (r < 0) |
345 | return r; | |
346 | ||
347 | return 0; | |
348 | } | |
f882c247 TG |
349 | |
350 | int manager_rtnl_listen(Manager *m) { | |
351 | int r; | |
352 | ||
353 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
354 | if (r < 0) | |
355 | return r; | |
356 | ||
dd3efc09 TG |
357 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); |
358 | if (r < 0) | |
359 | return r; | |
360 | ||
f882c247 TG |
361 | return 0; |
362 | } | |
3bef724f | 363 | |
1346b1f0 TG |
364 | int manager_bus_listen(Manager *m) { |
365 | int r; | |
366 | ||
bcbca829 TG |
367 | assert(m->event); |
368 | ||
369 | if (!m->bus) /* TODO: drop when we can rely on kdbus */ | |
370 | return 0; | |
371 | ||
1346b1f0 TG |
372 | r = sd_bus_attach_event(m->bus, m->event, 0); |
373 | if (r < 0) | |
374 | return r; | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
3bef724f TG |
379 | static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) { |
380 | char buf[INET6_ADDRSTRLEN]; | |
381 | const char *address; | |
382 | ||
383 | address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN); | |
384 | if (!address) { | |
385 | log_warning("Invalid DNS address. Ignoring."); | |
386 | return; | |
387 | } | |
388 | ||
389 | if (*count == MAXNS) | |
f3621dec TG |
390 | fputs("# Too many DNS servers configured, the following entries " |
391 | "will be ignored\n", f); | |
3bef724f TG |
392 | |
393 | fprintf(f, "nameserver %s\n", address); | |
394 | ||
395 | (*count) ++; | |
396 | } | |
397 | ||
398 | int manager_update_resolv_conf(Manager *m) { | |
399 | _cleanup_free_ char *temp_path = NULL; | |
400 | _cleanup_fclose_ FILE *f = NULL; | |
401 | Link *link; | |
402 | Iterator i; | |
403 | unsigned count = 0; | |
039ebe6a | 404 | const char *domainname = NULL; |
3bef724f TG |
405 | int r; |
406 | ||
407 | assert(m); | |
408 | ||
3bef724f TG |
409 | r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path); |
410 | if (r < 0) | |
411 | return r; | |
412 | ||
413 | fchmod(fileno(f), 0644); | |
414 | ||
b2ad8a16 TG |
415 | fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n" |
416 | "# Third party programs must not access this file directly, but\n" | |
417 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
418 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
419 | "# static file or a different symlink.\n\n", f); | |
3bef724f TG |
420 | |
421 | HASHMAP_FOREACH(link, m->links, i) { | |
a6cc569e | 422 | if (link->dhcp_lease) { |
7ae4ef6d TG |
423 | struct in_addr *nameservers; |
424 | size_t nameservers_size; | |
3bef724f | 425 | |
039ebe6a | 426 | if (link->network->dhcp_dns) { |
a6cc569e | 427 | r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size); |
039ebe6a TG |
428 | if (r >= 0) { |
429 | unsigned j; | |
3bef724f | 430 | |
039ebe6a TG |
431 | for (j = 0; j < nameservers_size; j++) |
432 | append_dns(f, &nameservers[j], AF_INET, &count); | |
433 | } | |
434 | } | |
435 | ||
436 | if (link->network->dhcp_domainname && !domainname) { | |
a6cc569e | 437 | r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); |
039ebe6a TG |
438 | if (r >= 0) |
439 | fprintf(f, "domain %s\n", domainname); | |
3bef724f TG |
440 | } |
441 | } | |
442 | } | |
443 | ||
06f021a8 TG |
444 | HASHMAP_FOREACH(link, m->links, i) { |
445 | if (link->network && link->network->dns) { | |
446 | Address *address; | |
447 | Iterator j; | |
448 | ||
449 | SET_FOREACH(address, link->network->dns, j) { | |
450 | append_dns(f, &address->in_addr.in, | |
451 | address->family, &count); | |
452 | } | |
453 | } | |
454 | } | |
3bef724f TG |
455 | |
456 | fflush(f); | |
457 | ||
458 | if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) { | |
459 | r = -errno; | |
460 | unlink("/run/systemd/network/resolv.conf"); | |
461 | unlink(temp_path); | |
462 | return r; | |
463 | } | |
464 | ||
465 | return 0; | |
466 | } | |
bbf7c048 TG |
467 | |
468 | int manager_save(Manager *m) { | |
469 | Link *link; | |
470 | Iterator i; | |
471 | _cleanup_free_ char *temp_path = NULL; | |
472 | _cleanup_fclose_ FILE *f = NULL; | |
473 | const char *oper_state = "unknown"; | |
474 | bool dormant, carrier; | |
475 | int r; | |
476 | ||
477 | assert(m); | |
478 | assert(m->state_file); | |
479 | ||
480 | HASHMAP_FOREACH(link, m->links, i) { | |
481 | if (link->flags & IFF_LOOPBACK) | |
482 | continue; | |
483 | ||
484 | if (link_has_carrier(link->flags, link->operstate)) | |
485 | carrier = true; | |
486 | else if (link->operstate == IF_OPER_DORMANT) | |
487 | dormant = true; | |
488 | } | |
489 | ||
490 | if (carrier) | |
491 | oper_state = "carrier"; | |
492 | else if (dormant) | |
493 | oper_state = "dormant"; | |
494 | ||
495 | r = fopen_temporary(m->state_file, &f, &temp_path); | |
496 | if (r < 0) | |
497 | goto finish; | |
498 | ||
499 | fchmod(fileno(f), 0644); | |
500 | ||
501 | fprintf(f, | |
502 | "# This is private data. Do not parse.\n" | |
503 | "OPER_STATE=%s\n", oper_state); | |
504 | ||
505 | fflush(f); | |
506 | ||
507 | if (ferror(f) || rename(temp_path, m->state_file) < 0) { | |
508 | r = -errno; | |
509 | unlink(m->state_file); | |
510 | unlink(temp_path); | |
511 | } | |
512 | ||
513 | finish: | |
514 | if (r < 0) | |
515 | log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r)); | |
516 | ||
517 | return r; | |
518 | } |