5166c0c75d6f2d2f04d190f8a2d57563d8f13101
[project/netifd.git] / interface.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14 #include <string.h>
15 #include <stdlib.h>
16 #include <stdio.h>
17
18 #include "netifd.h"
19 #include "device.h"
20 #include "interface.h"
21 #include "interface-ip.h"
22 #include "proto.h"
23 #include "ubus.h"
24 #include "config.h"
25 #include "system.h"
26
27 struct vlist_tree interfaces;
28 static LIST_HEAD(iface_all_users);
29
30 enum {
31 IFACE_ATTR_IFNAME,
32 IFACE_ATTR_PROTO,
33 IFACE_ATTR_AUTO,
34 IFACE_ATTR_DEFAULTROUTE,
35 IFACE_ATTR_PEERDNS,
36 IFACE_ATTR_DNS,
37 IFACE_ATTR_DNS_SEARCH,
38 IFACE_ATTR_METRIC,
39 IFACE_ATTR_INTERFACE,
40 IFACE_ATTR_IP6ASSIGN,
41 IFACE_ATTR_IP6HINT,
42 IFACE_ATTR_IP4TABLE,
43 IFACE_ATTR_IP6TABLE,
44 IFACE_ATTR_IP6CLASS,
45 IFACE_ATTR_DELEGATE,
46 IFACE_ATTR_IP6IFACEID,
47 IFACE_ATTR_FORCE_LINK,
48 IFACE_ATTR_MAX
49 };
50
51 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
52 [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
53 [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
54 [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
55 [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
56 [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
57 [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
58 [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
59 [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
60 [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
61 [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
62 [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
63 [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
64 [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
65 [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
66 [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
67 [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
68 [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
69 };
70
71 const struct uci_blob_param_list interface_attr_list = {
72 .n_params = IFACE_ATTR_MAX,
73 .params = iface_attrs,
74 };
75
76 static void
77 interface_error_flush(struct interface *iface)
78 {
79 struct interface_error *error, *tmp;
80
81 list_for_each_entry_safe(error, tmp, &iface->errors, list) {
82 list_del(&error->list);
83 free(error);
84 }
85 }
86
87 static void
88 interface_clear_errors(struct interface *iface)
89 {
90 /* don't flush the errors in case the configured protocol handler matches the
91 running protocol handler and is having the last error capability */
92 if (!(iface->proto &&
93 (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
94 (iface->proto->handler->name == iface->proto_handler->name)))
95 interface_error_flush(iface);
96 }
97
98 void interface_add_error(struct interface *iface, const char *subsystem,
99 const char *code, const char **data, int n_data)
100 {
101 struct interface_error *error;
102 int i, len = 0;
103 int *datalen = NULL;
104 char *dest, *d_subsys, *d_code;
105
106 /* if the configured protocol handler has the last error support capability,
107 errors should only be added if the running protocol handler matches the
108 configured one */
109 if (iface->proto &&
110 (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
111 (iface->proto->handler->name != iface->proto_handler->name))
112 return;
113
114 if (n_data) {
115 len = n_data * sizeof(char *);
116 datalen = alloca(len);
117 for (i = 0; i < n_data; i++) {
118 datalen[i] = strlen(data[i]) + 1;
119 len += datalen[i];
120 }
121 }
122
123 error = calloc_a(sizeof(*error) + sizeof(char *) + len,
124 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
125 &d_code, code ? strlen(code) + 1 : 0);
126 if (!error)
127 return;
128
129 /* Only keep the last flagged error, prevent this list grows unlimitted in case the
130 protocol can't be established (e.g auth failure) */
131 if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
132 interface_error_flush(iface);
133
134 list_add_tail(&error->list, &iface->errors);
135
136 dest = (char *) &error->data[n_data + 1];
137 for (i = 0; i < n_data; i++) {
138 error->data[i] = dest;
139 memcpy(dest, data[i], datalen[i]);
140 dest += datalen[i];
141 }
142 error->data[n_data] = NULL;
143
144 if (subsystem)
145 error->subsystem = strcpy(d_subsys, subsystem);
146
147 if (code)
148 error->code = strcpy(d_code, code);
149 }
150
151 static void
152 interface_data_del(struct interface *iface, struct interface_data *data)
153 {
154 avl_delete(&iface->data, &data->node);
155 free(data);
156 }
157
158 static void
159 interface_data_flush(struct interface *iface)
160 {
161 struct interface_data *d, *tmp;
162
163 avl_for_each_element_safe(&iface->data, d, node, tmp)
164 interface_data_del(iface, d);
165 }
166
167 int
168 interface_add_data(struct interface *iface, const struct blob_attr *data)
169 {
170 struct interface_data *n, *o;
171
172 if (!blobmsg_check_attr(data, true))
173 return UBUS_STATUS_INVALID_ARGUMENT;
174
175 const char *name = blobmsg_name(data);
176 unsigned len = blob_pad_len(data);
177
178 o = avl_find_element(&iface->data, name, o, node);
179 if (o) {
180 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
181 return 0;
182
183 interface_data_del(iface, o);
184 }
185
186 n = calloc(1, sizeof(*n) + len);
187 memcpy(n->data, data, len);
188 n->node.key = blobmsg_name(n->data);
189 avl_insert(&iface->data, &n->node);
190
191 iface->updated |= IUF_DATA;
192 return 0;
193 }
194
195 static void
196 interface_event(struct interface *iface, enum interface_event ev)
197 {
198 struct interface_user *dep, *tmp;
199 struct device *adev = NULL;
200
201 list_for_each_entry_safe(dep, tmp, &iface->users, list)
202 dep->cb(dep, iface, ev);
203
204 list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
205 dep->cb(dep, iface, ev);
206
207 switch (ev) {
208 case IFEV_UP:
209 interface_error_flush(iface);
210 adev = iface->l3_dev.dev;
211 /* fall through */
212 case IFEV_DOWN:
213 alias_notify_device(iface->name, adev);
214 break;
215 default:
216 break;
217 }
218 }
219
220 static void
221 interface_flush_state(struct interface *iface)
222 {
223 if (iface->l3_dev.dev)
224 device_release(&iface->l3_dev);
225 interface_data_flush(iface);
226 }
227
228 static void
229 mark_interface_down(struct interface *iface)
230 {
231 enum interface_state state = iface->state;
232
233 if (state == IFS_DOWN)
234 return;
235
236 iface->state = IFS_DOWN;
237 if (state == IFS_UP)
238 interface_event(iface, IFEV_DOWN);
239 interface_ip_set_enabled(&iface->config_ip, false);
240 interface_ip_flush(&iface->proto_ip);
241 interface_flush_state(iface);
242 system_flush_routes();
243 }
244
245 void
246 __interface_set_down(struct interface *iface, bool force)
247 {
248 enum interface_state state = iface->state;
249 switch (state) {
250 case IFS_UP:
251 case IFS_SETUP:
252 iface->state = IFS_TEARDOWN;
253 if (state == IFS_UP)
254 interface_event(iface, IFEV_DOWN);
255
256 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
257 if (force)
258 interface_flush_state(iface);
259
260 if (iface->dynamic)
261 vlist_delete(&interfaces, &iface->node);
262 break;
263
264 case IFS_DOWN:
265 if (iface->main_dev.dev)
266 device_release(&iface->main_dev);
267 case IFS_TEARDOWN:
268 default:
269 break;
270 }
271 }
272
273 static int
274 __interface_set_up(struct interface *iface)
275 {
276 int ret;
277
278 netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
279
280 iface->state = IFS_SETUP;
281 ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
282 if (ret)
283 mark_interface_down(iface);
284
285 return ret;
286 }
287
288 static void
289 interface_check_state(struct interface *iface)
290 {
291 bool link_state = iface->link_state || iface->force_link;
292
293 switch (iface->state) {
294 case IFS_UP:
295 case IFS_SETUP:
296 if (!iface->enabled || !link_state) {
297 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
298 mark_interface_down(iface);
299 }
300 break;
301 case IFS_DOWN:
302 if (!iface->available)
303 return;
304
305 if (iface->autostart && iface->enabled && link_state && !config_init)
306 __interface_set_up(iface);
307 break;
308 default:
309 break;
310 }
311 }
312
313 static void
314 interface_set_enabled(struct interface *iface, bool new_state)
315 {
316 if (iface->enabled == new_state)
317 return;
318
319 netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
320 iface->enabled = new_state;
321 interface_check_state(iface);
322 }
323
324 static void
325 interface_set_link_state(struct interface *iface, bool new_state)
326 {
327 if (iface->link_state == new_state)
328 return;
329
330 netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
331 iface->link_state = new_state;
332 interface_check_state(iface);
333 }
334
335 static void
336 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
337 {
338 if (ev == DEV_EVENT_REMOVE)
339 device_remove_user(dep);
340 }
341
342 static void
343 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
344 {
345 struct interface *iface;
346 bool new_state = false;
347
348 iface = container_of(dep, struct interface, main_dev);
349 switch (ev) {
350 case DEV_EVENT_ADD:
351 new_state = true;
352 case DEV_EVENT_REMOVE:
353 interface_set_available(iface, new_state);
354 if (!new_state && dep->dev && dep->dev->external)
355 interface_set_main_dev(iface, NULL);
356 break;
357 case DEV_EVENT_UP:
358 new_state = true;
359 case DEV_EVENT_DOWN:
360 interface_set_enabled(iface, new_state);
361 break;
362 case DEV_EVENT_LINK_UP:
363 new_state = true;
364 case DEV_EVENT_LINK_DOWN:
365 interface_set_link_state(iface, new_state);
366 break;
367 case DEV_EVENT_TOPO_CHANGE:
368 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
369 return;
370 default:
371 break;
372 }
373 }
374
375 static void
376 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
377 {
378 struct interface *iface;
379
380 iface = container_of(dep, struct interface, l3_dev);
381 if (iface->l3_dev.dev == iface->main_dev.dev)
382 return;
383
384 switch (ev) {
385 case DEV_EVENT_LINK_DOWN:
386 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
387 break;
388 default:
389 break;
390 }
391 }
392
393 void
394 interface_set_available(struct interface *iface, bool new_state)
395 {
396 if (iface->available == new_state)
397 return;
398
399 D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
400 iface->available = new_state;
401
402 if (new_state) {
403 if (iface->autostart && !config_init)
404 interface_set_up(iface);
405 } else
406 __interface_set_down(iface, true);
407 }
408
409 void
410 interface_add_user(struct interface_user *dep, struct interface *iface)
411 {
412 if (!iface) {
413 list_add(&dep->list, &iface_all_users);
414 return;
415 }
416
417 dep->iface = iface;
418 list_add(&dep->list, &iface->users);
419 if (iface->state == IFS_UP)
420 dep->cb(dep, iface, IFEV_UP);
421 }
422
423 void
424 interface_remove_user(struct interface_user *dep)
425 {
426 list_del_init(&dep->list);
427 dep->iface = NULL;
428 }
429
430 static void
431 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
432 {
433 struct blob_attr *cur;
434 int rem;
435
436 blobmsg_for_each_attr(cur, list, rem) {
437 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
438 continue;
439
440 if (!blobmsg_check_attr(cur, NULL))
441 continue;
442
443 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
444 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
445 list_add(&c->head, &iface->assignment_classes);
446 }
447 }
448
449 static void
450 interface_clear_assignment_classes(struct interface *iface)
451 {
452 while (!list_empty(&iface->assignment_classes)) {
453 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
454 struct interface_assignment_class, head);
455 list_del(&c->head);
456 free(c);
457 }
458 }
459
460 static void
461 interface_merge_assignment_data(struct interface *old, struct interface *new)
462 {
463 bool changed = (old->assignment_hint != new->assignment_hint ||
464 old->assignment_length != new->assignment_length ||
465 old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
466 (old->assignment_iface_id_selection == IFID_FIXED &&
467 memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
468 sizeof(old->assignment_fixed_iface_id))) ||
469 list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
470
471 struct interface_assignment_class *c;
472 list_for_each_entry(c, &new->assignment_classes, head) {
473 // Compare list entries one-by-one to see if there was a change
474 if (list_empty(&old->assignment_classes)) // The new list is longer
475 changed = true;
476
477 if (changed)
478 break;
479
480 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
481 struct interface_assignment_class, head);
482
483 if (strcmp(c_old->name, c->name)) // An entry didn't match
484 break;
485
486 list_del(&c_old->head);
487 free(c_old);
488 }
489
490 // The old list was longer than the new one or the last entry didn't match
491 if (!list_empty(&old->assignment_classes)) {
492 interface_clear_assignment_classes(old);
493 changed = true;
494 }
495
496 list_splice_init(&new->assignment_classes, &old->assignment_classes);
497
498 if (changed) {
499 old->assignment_hint = new->assignment_hint;
500 old->assignment_length = new->assignment_length;
501 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
502 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
503 interface_refresh_assignments(true);
504 }
505 }
506
507 static void
508 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
509 {
510 struct interface *alias = container_of(dep, struct interface, parent_iface);
511 struct device *dev = iface->l3_dev.dev;
512
513 switch (ev) {
514 case IFEV_UP:
515 if (!dev)
516 return;
517
518 interface_set_main_dev(alias, dev);
519 interface_set_available(alias, true);
520 break;
521 case IFEV_DOWN:
522 interface_set_available(alias, false);
523 interface_set_main_dev(alias, NULL);
524 break;
525 case IFEV_FREE:
526 interface_remove_user(dep);
527 break;
528 case IFEV_RELOAD:
529 case IFEV_UPDATE:
530 break;
531 }
532 }
533
534 static void
535 interface_set_device_config(struct interface *iface, struct device *dev)
536 {
537 if (!dev || !dev->default_config)
538 return;
539
540 if (!iface->device_config &&
541 (!dev->iface_config || dev->config_iface != iface))
542 return;
543
544 dev->config_iface = iface;
545 dev->iface_config = iface->device_config;
546 device_apply_config(dev, dev->type, iface->config);
547 }
548
549 static void
550 interface_claim_device(struct interface *iface)
551 {
552 struct interface *parent;
553 struct device *dev = NULL;
554
555 if (iface->parent_iface.iface)
556 interface_remove_user(&iface->parent_iface);
557
558 if (iface->parent_ifname) {
559 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
560 iface->parent_iface.cb = interface_alias_cb;
561 interface_add_user(&iface->parent_iface, parent);
562 } else if (iface->ifname &&
563 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
564 dev = device_get(iface->ifname, true);
565 interface_set_device_config(iface, dev);
566 } else {
567 dev = iface->ext_dev.dev;
568 }
569
570 if (dev)
571 interface_set_main_dev(iface, dev);
572
573 if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
574 interface_set_available(iface, true);
575 }
576
577 static void
578 interface_cleanup_state(struct interface *iface)
579 {
580 interface_set_available(iface, false);
581
582 interface_flush_state(iface);
583 interface_clear_errors(iface);
584 interface_set_proto_state(iface, NULL);
585
586 interface_set_main_dev(iface, NULL);
587 interface_set_l3_dev(iface, NULL);
588 }
589
590 static void
591 interface_cleanup(struct interface *iface)
592 {
593 struct interface_user *dep, *tmp;
594
595 uloop_timeout_cancel(&iface->remove_timer);
596 device_remove_user(&iface->ext_dev);
597
598 if (iface->parent_iface.iface)
599 interface_remove_user(&iface->parent_iface);
600
601 list_for_each_entry_safe(dep, tmp, &iface->users, list)
602 interface_remove_user(dep);
603
604 interface_clear_assignment_classes(iface);
605 interface_ip_flush(&iface->config_ip);
606 interface_cleanup_state(iface);
607 }
608
609 static void
610 interface_do_free(struct interface *iface)
611 {
612 interface_event(iface, IFEV_FREE);
613 interface_cleanup(iface);
614 free(iface->config);
615 netifd_ubus_remove_interface(iface);
616 avl_delete(&interfaces.avl, &iface->node.avl);
617 free(iface);
618 }
619
620 static void
621 interface_do_reload(struct interface *iface)
622 {
623 interface_event(iface, IFEV_RELOAD);
624 interface_cleanup_state(iface);
625 proto_init_interface(iface, iface->config);
626 interface_claim_device(iface);
627 }
628
629 static void
630 interface_handle_config_change(struct interface *iface)
631 {
632 enum interface_config_state state = iface->config_state;
633
634 iface->config_state = IFC_NORMAL;
635 switch(state) {
636 case IFC_NORMAL:
637 break;
638 case IFC_RELOAD:
639 interface_do_reload(iface);
640 break;
641 case IFC_REMOVE:
642 interface_do_free(iface);
643 return;
644 }
645 if (iface->autostart && iface->available)
646 interface_set_up(iface);
647 }
648
649 static void
650 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
651 {
652 struct interface *iface = state->iface;
653
654 switch (ev) {
655 case IFPEV_UP:
656 if (iface->state != IFS_SETUP) {
657 interface_event(iface, IFEV_UPDATE);
658 return;
659 }
660
661 if (!iface->l3_dev.dev)
662 interface_set_l3_dev(iface, iface->main_dev.dev);
663
664 interface_ip_set_enabled(&iface->config_ip, true);
665 system_flush_routes();
666 iface->state = IFS_UP;
667 iface->start_time = system_get_rtime();
668 interface_event(iface, IFEV_UP);
669 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
670 break;
671 case IFPEV_DOWN:
672 if (iface->state == IFS_DOWN)
673 return;
674
675 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
676 mark_interface_down(iface);
677 if (iface->main_dev.dev)
678 device_release(&iface->main_dev);
679 if (iface->l3_dev.dev)
680 device_remove_user(&iface->l3_dev);
681 interface_handle_config_change(iface);
682 break;
683 case IFPEV_LINK_LOST:
684 if (iface->state != IFS_UP)
685 return;
686
687 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
688 mark_interface_down(iface);
689 iface->state = IFS_SETUP;
690 break;
691 default:
692 return;
693 }
694
695 interface_write_resolv_conf();
696 }
697
698 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
699 {
700 if (iface->proto) {
701 iface->proto->free(iface->proto);
702 iface->proto = NULL;
703 }
704 iface->state = IFS_DOWN;
705 iface->proto = state;
706 if (!state)
707 return;
708
709 state->proto_event = interface_proto_cb;
710 state->iface = iface;
711 }
712
713 struct interface *
714 interface_alloc(const char *name, struct blob_attr *config)
715 {
716 struct interface *iface;
717 struct blob_attr *tb[IFACE_ATTR_MAX];
718 struct blob_attr *cur;
719 const char *proto_name = NULL;
720 char *iface_name;
721 bool force_link = false;
722
723 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
724 iface->name = strcpy(iface_name, name);
725 INIT_LIST_HEAD(&iface->errors);
726 INIT_LIST_HEAD(&iface->users);
727 INIT_LIST_HEAD(&iface->hotplug_list);
728 INIT_LIST_HEAD(&iface->assignment_classes);
729 interface_ip_init(iface);
730 avl_init(&iface->data, avl_strcmp, false, NULL);
731 iface->config_ip.enabled = false;
732
733 iface->main_dev.cb = interface_main_dev_cb;
734 iface->l3_dev.cb = interface_l3_dev_cb;
735 iface->ext_dev.cb = interface_ext_dev_cb;
736
737 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
738 blob_data(config), blob_len(config));
739
740 if ((cur = tb[IFACE_ATTR_PROTO]))
741 proto_name = blobmsg_data(cur);
742
743 proto_attach_interface(iface, proto_name);
744 if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
745 force_link = true;
746
747 iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
748 iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
749 iface->proto_ip.no_defaultroute =
750 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
751 iface->proto_ip.no_dns =
752 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
753
754 if ((cur = tb[IFACE_ATTR_DNS]))
755 interface_add_dns_server_list(&iface->config_ip, cur);
756
757 if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
758 interface_add_dns_search_list(&iface->config_ip, cur);
759
760 if ((cur = tb[IFACE_ATTR_METRIC]))
761 iface->metric = blobmsg_get_u32(cur);
762
763 if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
764 iface->assignment_length = blobmsg_get_u32(cur);
765
766 /* defaults */
767 iface->assignment_iface_id_selection = IFID_FIXED;
768 iface->assignment_fixed_iface_id = in6addr_any;
769 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
770
771 if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
772 const char *ifaceid = blobmsg_data(cur);
773 if (!strcmp(ifaceid, "random")) {
774 iface->assignment_iface_id_selection = IFID_RANDOM;
775 }
776 else if (!strcmp(ifaceid, "eui64")) {
777 iface->assignment_iface_id_selection = IFID_EUI64;
778 }
779 else {
780 /* we expect an IPv6 address with network id zero here -> fixed iface id
781 if we cannot parse -> revert to iface id 1 */
782 if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
783 iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
784 iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
785 iface->assignment_fixed_iface_id = in6addr_any;
786 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
787 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
788 falling back to iface id 1.\n", iface->name);
789 }
790 }
791 }
792
793 iface->assignment_hint = -1;
794 if ((cur = tb[IFACE_ATTR_IP6HINT]))
795 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
796 ~((1 << (64 - iface->assignment_length)) - 1);
797
798 if ((cur = tb[IFACE_ATTR_IP6CLASS]))
799 interface_add_assignment_classes(iface, cur);
800
801
802 if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
803 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
804 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
805 }
806
807 if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
808 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
809 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
810 }
811
812 iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
813
814 iface->config_autostart = iface->autostart;
815 return iface;
816 }
817
818 void interface_set_dynamic(struct interface *iface)
819 {
820 iface->dynamic = true;
821 iface->autostart = true;
822 iface->node.version = -1; // Don't delete on reload
823 }
824
825 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
826 {
827 struct blob_attr *tb[IFACE_ATTR_MAX];
828 struct blob_attr *cur;
829
830 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
831 blob_data(config), blob_len(config));
832
833 if (alias) {
834 if ((cur = tb[IFACE_ATTR_INTERFACE]))
835 iface->parent_ifname = blobmsg_data(cur);
836
837 if (!iface->parent_ifname)
838 return false;
839 } else {
840 if ((cur = tb[IFACE_ATTR_IFNAME]))
841 iface->ifname = blobmsg_data(cur);
842 }
843
844 iface->config = config;
845 vlist_add(&interfaces, &iface->node, iface->name);
846 return true;
847 }
848
849 void
850 interface_add(struct interface *iface, struct blob_attr *config)
851 {
852 __interface_add(iface, config, false);
853 }
854
855 bool
856 interface_add_alias(struct interface *iface, struct blob_attr *config)
857 {
858 if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
859 return false;
860
861 return __interface_add(iface, config, true);
862 }
863
864 void
865 interface_set_l3_dev(struct interface *iface, struct device *dev)
866 {
867 bool enabled = iface->config_ip.enabled;
868 bool claimed = iface->l3_dev.claimed;
869
870 if (iface->l3_dev.dev == dev)
871 return;
872
873 interface_ip_set_enabled(&iface->config_ip, false);
874 interface_ip_flush(&iface->proto_ip);
875 device_add_user(&iface->l3_dev, dev);
876
877 if (dev) {
878 if (claimed) {
879 if (device_claim(&iface->l3_dev) < 0)
880 return;
881 }
882 interface_ip_set_enabled(&iface->config_ip, enabled);
883 }
884 }
885
886 void
887 interface_set_main_dev(struct interface *iface, struct device *dev)
888 {
889 bool claimed = iface->l3_dev.claimed;
890
891 if (iface->main_dev.dev == dev)
892 return;
893
894 interface_set_available(iface, false);
895 device_add_user(&iface->main_dev, dev);
896 if (!dev) {
897 interface_set_link_state(iface, false);
898 return;
899 }
900
901 if (claimed) {
902 if (device_claim(&iface->l3_dev) < 0)
903 return;
904 }
905
906 if (!iface->l3_dev.dev)
907 interface_set_l3_dev(iface, dev);
908 }
909
910 int
911 interface_remove_link(struct interface *iface, struct device *dev)
912 {
913 struct device *mdev = iface->main_dev.dev;
914
915 if (mdev && mdev->hotplug_ops)
916 return mdev->hotplug_ops->del(mdev, dev);
917
918 if (dev == iface->ext_dev.dev)
919 device_remove_user(&iface->ext_dev);
920
921 if (!iface->main_dev.hotplug)
922 return UBUS_STATUS_INVALID_ARGUMENT;
923
924 if (dev != iface->main_dev.dev)
925 return UBUS_STATUS_INVALID_ARGUMENT;
926
927 interface_set_main_dev(iface, NULL);
928 return 0;
929 }
930
931 static int
932 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
933 {
934 struct device *mdev = iface->main_dev.dev;
935
936 if (mdev == dev)
937 return 0;
938
939 if (iface->main_dev.hotplug)
940 device_remove_user(&iface->main_dev);
941
942 if (mdev) {
943 if (mdev->hotplug_ops)
944 return mdev->hotplug_ops->add(mdev, dev);
945 else
946 return UBUS_STATUS_NOT_SUPPORTED;
947 }
948
949 if (link_ext)
950 device_add_user(&iface->ext_dev, dev);
951
952 interface_set_main_dev(iface, dev);
953 iface->main_dev.hotplug = true;
954 return 0;
955 }
956
957 int
958 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
959 {
960 struct device *dev;
961 int ret;
962
963 device_lock();
964
965 dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
966 if (!dev) {
967 ret = UBUS_STATUS_NOT_FOUND;
968 goto out;
969 }
970
971 if (add) {
972 interface_set_device_config(iface, dev);
973 device_set_present(dev, true);
974
975 ret = interface_add_link(iface, dev, link_ext);
976 } else {
977 ret = interface_remove_link(iface, dev);
978 }
979
980 out:
981 device_unlock();
982
983 return ret;
984 }
985
986 int
987 interface_set_up(struct interface *iface)
988 {
989 int ret;
990
991 iface->autostart = true;
992
993 if (iface->state != IFS_DOWN)
994 return 0;
995
996 interface_clear_errors(iface);
997 if (!iface->available) {
998 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
999 return -1;
1000 }
1001
1002 if (iface->main_dev.dev) {
1003 ret = device_claim(&iface->main_dev);
1004 if (!ret)
1005 interface_check_state(iface);
1006 }
1007 else
1008 ret = __interface_set_up(iface);
1009
1010 return ret;
1011 }
1012
1013 int
1014 interface_set_down(struct interface *iface)
1015 {
1016 if (!iface) {
1017 vlist_for_each_element(&interfaces, iface, node)
1018 __interface_set_down(iface, false);
1019 } else {
1020 iface->autostart = false;
1021 __interface_set_down(iface, false);
1022 }
1023
1024 return 0;
1025 }
1026
1027 void
1028 interface_start_pending(void)
1029 {
1030 struct interface *iface;
1031
1032 vlist_for_each_element(&interfaces, iface, node) {
1033 if (iface->available && iface->autostart)
1034 interface_set_up(iface);
1035 }
1036 }
1037
1038 static void
1039 set_config_state(struct interface *iface, enum interface_config_state s)
1040 {
1041 iface->config_state = s;
1042 if (iface->state == IFS_DOWN)
1043 interface_handle_config_change(iface);
1044 else
1045 __interface_set_down(iface, false);
1046 }
1047
1048 void
1049 interface_update_start(struct interface *iface)
1050 {
1051 iface->updated = 0;
1052 interface_ip_update_start(&iface->proto_ip);
1053 }
1054
1055 void
1056 interface_update_complete(struct interface *iface)
1057 {
1058 interface_ip_update_complete(&iface->proto_ip);
1059 }
1060
1061 static void
1062 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1063 {
1064 vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1065 vlist_simple_replace(&new->dns_search, &old->dns_search);
1066 }
1067
1068 static bool
1069 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1070 {
1071 struct blob_attr *ntb[__DEV_ATTR_MAX];
1072 struct blob_attr *otb[__DEV_ATTR_MAX];
1073 struct device *dev = if_old->main_dev.dev;
1074 unsigned long diff = 0;
1075
1076 BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1077
1078 if (!dev)
1079 return false;
1080
1081 if (if_old->device_config != if_new->device_config)
1082 return true;
1083
1084 if (!if_new->device_config)
1085 return false;
1086
1087 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1088 blob_data(if_old->config), blob_len(if_old->config));
1089
1090 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1091 blob_data(if_new->config), blob_len(if_new->config));
1092
1093 uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1094 return diff;
1095 }
1096
1097 static void
1098 interface_change_config(struct interface *if_old, struct interface *if_new)
1099 {
1100 struct blob_attr *old_config = if_old->config;
1101 bool reload = false, reload_ip = false;
1102
1103 #define FIELD_CHANGED_STR(field) \
1104 ((!!if_old->field != !!if_new->field) || \
1105 (if_old->field && \
1106 strcmp(if_old->field, if_new->field) != 0))
1107
1108 if (FIELD_CHANGED_STR(parent_ifname)) {
1109 if (if_old->parent_iface.iface)
1110 interface_remove_user(&if_old->parent_iface);
1111 reload = true;
1112 }
1113
1114 if (!reload && interface_device_config_changed(if_old, if_new))
1115 reload = true;
1116
1117 if (FIELD_CHANGED_STR(ifname) ||
1118 if_old->proto_handler != if_new->proto_handler)
1119 reload = true;
1120
1121 if (!if_old->proto_handler->config_params)
1122 D(INTERFACE, "No config parameters for interface '%s'\n",
1123 if_old->name);
1124 else if (!uci_blob_check_equal(if_old->config, if_new->config,
1125 if_old->proto_handler->config_params))
1126 reload = true;
1127
1128 #define UPDATE(field, __var) ({ \
1129 bool __changed = (if_old->field != if_new->field); \
1130 if_old->field = if_new->field; \
1131 __var |= __changed; \
1132 })
1133
1134 if_old->config = if_new->config;
1135 if (if_old->config_autostart != if_new->config_autostart) {
1136 if (if_old->config_autostart)
1137 reload = true;
1138
1139 if_old->autostart = if_new->config_autostart;
1140 }
1141
1142 if_old->device_config = if_new->device_config;
1143 if_old->config_autostart = if_new->config_autostart;
1144 if_old->ifname = if_new->ifname;
1145 if_old->parent_ifname = if_new->parent_ifname;
1146 if_old->proto_handler = if_new->proto_handler;
1147 if_old->force_link = if_new->force_link;
1148
1149 if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1150 interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1151
1152 UPDATE(metric, reload_ip);
1153 UPDATE(proto_ip.no_defaultroute, reload_ip);
1154 UPDATE(ip4table, reload_ip);
1155 UPDATE(ip6table, reload_ip);
1156 interface_merge_assignment_data(if_old, if_new);
1157
1158 #undef UPDATE
1159
1160 if (reload) {
1161 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1162 if_old->name);
1163 interface_clear_errors(if_old);
1164 set_config_state(if_old, IFC_RELOAD);
1165 goto out;
1166 }
1167
1168 if (reload_ip) {
1169 bool config_ip_enabled = if_old->config_ip.enabled;
1170 bool proto_ip_enabled = if_old->proto_ip.enabled;
1171
1172 interface_ip_set_enabled(&if_old->config_ip, false);
1173 interface_ip_set_enabled(&if_old->proto_ip, false);
1174 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1175 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1176 }
1177
1178 interface_write_resolv_conf();
1179 if (if_old->main_dev.dev)
1180 interface_check_state(if_old);
1181
1182 out:
1183 if_new->config = NULL;
1184 interface_cleanup(if_new);
1185 free(old_config);
1186 free(if_new);
1187 }
1188
1189 static void
1190 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1191 struct vlist_node *node_old)
1192 {
1193 struct interface *if_old = container_of(node_old, struct interface, node);
1194 struct interface *if_new = container_of(node_new, struct interface, node);
1195
1196 if (node_old && node_new) {
1197 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1198 interface_change_config(if_old, if_new);
1199 } else if (node_old) {
1200 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1201 set_config_state(if_old, IFC_REMOVE);
1202 } else if (node_new) {
1203 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1204 proto_init_interface(if_new, if_new->config);
1205 interface_claim_device(if_new);
1206 netifd_ubus_add_interface(if_new);
1207 }
1208 }
1209
1210
1211 static void __init
1212 interface_init_list(void)
1213 {
1214 vlist_init(&interfaces, avl_strcmp, interface_update);
1215 interfaces.keep_old = true;
1216 interfaces.no_delete = true;
1217 }