defer releasing the l3 dev so that the generic code can take care of cleaning system...
[project/netifd.git] / interface.c
1 #include <string.h>
2 #include <stdlib.h>
3 #include <stdio.h>
4
5 #include "netifd.h"
6 #include "device.h"
7 #include "interface.h"
8 #include "interface-ip.h"
9 #include "proto.h"
10 #include "ubus.h"
11 #include "config.h"
12 #include "system.h"
13
14 struct vlist_tree interfaces;
15
16 enum {
17 IFACE_ATTR_IFNAME,
18 IFACE_ATTR_PROTO,
19 IFACE_ATTR_AUTO,
20 IFACE_ATTR_MAX
21 };
22
23 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
24 [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
25 [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
26 [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
27 };
28
29 const struct config_param_list interface_attr_list = {
30 .n_params = IFACE_ATTR_MAX,
31 .params = iface_attrs,
32 };
33
34 static void
35 interface_clear_errors(struct interface *iface)
36 {
37 struct interface_error *error, *tmp;
38
39 list_for_each_entry_safe(error, tmp, &iface->errors, list) {
40 list_del(&error->list);
41 free(error);
42 }
43 }
44
45 void interface_add_error(struct interface *iface, const char *subsystem,
46 const char *code, const char **data, int n_data)
47 {
48 struct interface_error *error;
49 int i, len = 0;
50 int *datalen = NULL;
51 char *dest;
52
53 if (n_data) {
54 len = n_data * sizeof(char *);
55 datalen = alloca(len);
56 for (i = 0; i < n_data; i++) {
57 datalen[i] = strlen(data[i]) + 1;
58 len += datalen[i];
59 }
60 }
61
62 error = calloc(1, sizeof(*error) + sizeof(char *) + len);
63 if (!error)
64 return;
65
66 list_add_tail(&error->list, &iface->errors);
67 error->subsystem = subsystem;
68 error->code = code;
69
70 dest = (char *) &error->data[n_data + 1];
71 for (i = 0; i < n_data; i++) {
72 error->data[i] = dest;
73 memcpy(dest, data[i], datalen[i]);
74 dest += datalen[i];
75 }
76 error->data[n_data] = NULL;
77 }
78
79 static void
80 interface_event(struct interface *iface, enum interface_event ev)
81 {
82 struct interface_user *dep, *tmp;
83
84 list_for_each_entry_safe(dep, tmp, &iface->users, list)
85 dep->cb(dep, IFEV_UP);
86
87 interface_queue_event(iface, ev);
88 }
89
90 static void
91 mark_interface_down(struct interface *iface)
92 {
93 interface_clear_dns(iface);
94 vlist_flush_all(&iface->proto_addr);
95 vlist_flush_all(&iface->proto_route);
96 if (iface->main_dev.dev)
97 device_release(&iface->main_dev);
98 iface->state = IFS_DOWN;
99 }
100
101 static int
102 __interface_set_up(struct interface *iface)
103 {
104 int ret;
105
106 if (iface->state != IFS_DOWN)
107 return 0;
108
109 if (iface->main_dev.dev) {
110 ret = device_claim(&iface->main_dev);
111 if (ret)
112 return ret;
113 }
114
115 iface->state = IFS_SETUP;
116 ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
117 if (ret) {
118 mark_interface_down(iface);
119 return ret;
120 }
121
122 return 0;
123 }
124
125 static void
126 __interface_set_down(struct interface *iface, bool force)
127 {
128 interface_clear_errors(iface);
129
130 if (iface->state == IFS_DOWN ||
131 iface->state == IFS_TEARDOWN)
132 return;
133
134 iface->state = IFS_TEARDOWN;
135 interface_event(iface, IFEV_DOWN);
136 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
137 }
138
139 static void
140 interface_cb(struct device_user *dep, enum device_event ev)
141 {
142 struct interface *iface;
143 bool new_state;
144
145 iface = container_of(dep, struct interface, main_dev);
146 switch (ev) {
147 case DEV_EVENT_ADD:
148 new_state = true;
149 break;
150 case DEV_EVENT_REMOVE:
151 new_state = false;
152 break;
153 default:
154 return;
155 }
156
157 interface_set_available(iface, new_state);
158 }
159
160 void
161 interface_set_available(struct interface *iface, bool new_state)
162 {
163 if (iface->available == new_state)
164 return;
165
166 D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
167 iface->available = new_state;
168
169 if (new_state) {
170 if (iface->autostart && !config_init)
171 interface_set_up(iface);
172 } else
173 __interface_set_down(iface, true);
174 }
175
176 void
177 interface_add_user(struct interface_user *dep, struct interface *iface)
178 {
179 dep->iface = iface;
180 list_add(&dep->list, &iface->users);
181 if (iface->state == IFS_UP)
182 dep->cb(dep, IFEV_UP);
183 }
184
185 void
186 interface_remove_user(struct interface_user *dep)
187 {
188 list_del_init(&dep->list);
189 dep->iface = NULL;
190 }
191
192 static void
193 interface_claim_device(struct interface *iface)
194 {
195 struct device *dev;
196
197 if (iface->proto_handler &&
198 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
199 dev = device_get(iface->ifname, true);
200 if (dev)
201 device_add_user(&iface->main_dev, dev);
202 }
203 }
204
205
206 static void
207 interface_cleanup(struct interface *iface)
208 {
209 struct interface_user *dep, *tmp;
210
211 list_for_each_entry_safe(dep, tmp, &iface->users, list)
212 interface_remove_user(dep);
213
214 interface_clear_dns(iface);
215 interface_clear_errors(iface);
216 if (iface->main_dev.dev)
217 device_remove_user(&iface->main_dev);
218 interface_set_proto_state(iface, NULL);
219 }
220
221 static void
222 interface_do_free(struct interface *iface)
223 {
224 interface_cleanup(iface);
225 free(iface->config);
226 netifd_ubus_remove_interface(iface);
227 avl_delete(&interfaces.avl, &iface->node.avl);
228 free(iface);
229 }
230
231 static void
232 interface_do_reload(struct interface *iface)
233 {
234 interface_cleanup(iface);
235
236 interface_claim_device(iface);
237 proto_init_interface(iface, iface->config);
238
239 if (iface->autostart && !config_init)
240 interface_set_up(iface);
241 }
242
243 static void
244 interface_handle_config_change(struct interface *iface)
245 {
246 switch(iface->config_state) {
247 case IFC_NORMAL:
248 break;
249 case IFC_RELOAD:
250 interface_do_reload(iface);
251 break;
252 case IFC_REMOVE:
253 interface_do_free(iface);
254 break;
255 }
256 }
257
258 static void
259 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
260 {
261 struct interface *iface = state->iface;
262
263 switch (ev) {
264 case IFPEV_UP:
265 if (iface->state != IFS_SETUP)
266 return;
267
268 system_flush_routes();
269 iface->state = IFS_UP;
270 iface->start_time = system_get_rtime();
271 interface_event(iface, IFEV_UP);
272 interface_write_resolv_conf();
273 break;
274 case IFPEV_DOWN:
275 if (iface->state == IFS_DOWN)
276 return;
277
278 system_flush_routes();
279 mark_interface_down(iface);
280 interface_handle_config_change(iface);
281 if (iface->autostart)
282 __interface_set_up(iface);
283 if (iface->l3_dev->dev)
284 device_release(iface->l3_dev);
285 break;
286 case IFPEV_LINK_LOST:
287 if (iface->state != IFS_UP)
288 return;
289
290 iface->state = IFS_SETUP;
291 interface_event(iface, IFEV_DOWN);
292 break;
293 }
294 }
295
296 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
297 {
298 if (iface->proto) {
299 iface->proto->free(iface->proto);
300 iface->proto = NULL;
301 }
302 iface->state = IFS_DOWN;
303 iface->proto = state;
304 if (!state)
305 return;
306
307 state->proto_event = interface_proto_cb;
308 state->iface = iface;
309 }
310
311 void
312 interface_init(struct interface *iface, const char *name,
313 struct blob_attr *config)
314 {
315 struct blob_attr *tb[IFACE_ATTR_MAX];
316 struct blob_attr *cur;
317 const char *proto_name = NULL;
318
319 strncpy(iface->name, name, sizeof(iface->name) - 1);
320 INIT_LIST_HEAD(&iface->errors);
321 INIT_LIST_HEAD(&iface->users);
322 INIT_LIST_HEAD(&iface->hotplug_list);
323 INIT_LIST_HEAD(&iface->proto_dns_search);
324 INIT_LIST_HEAD(&iface->proto_dns_servers);
325
326 iface->main_dev.cb = interface_cb;
327 iface->l3_dev = &iface->main_dev;
328
329 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
330 blob_data(config), blob_len(config));
331
332 if ((cur = tb[IFACE_ATTR_PROTO]))
333 proto_name = blobmsg_data(cur);
334
335 proto_attach_interface(iface, proto_name);
336
337 if ((cur = tb[IFACE_ATTR_AUTO]))
338 iface->autostart = blobmsg_get_bool(cur);
339 else
340 iface->autostart = true;
341 iface->config_autostart = iface->autostart;
342 }
343
344 void
345 interface_add(struct interface *iface, struct blob_attr *config)
346 {
347 struct blob_attr *tb[IFACE_ATTR_MAX];
348 struct blob_attr *cur;
349
350 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
351 blob_data(config), blob_len(config));
352
353 if ((cur = tb[IFACE_ATTR_IFNAME]))
354 iface->ifname = blobmsg_data(cur);
355
356 iface->config = config;
357 vlist_add(&interfaces, &iface->node);
358 }
359
360 void
361 interface_remove_link(struct interface *iface, struct device *dev)
362 {
363 struct device *mdev = iface->main_dev.dev;
364
365 if (mdev && mdev->hotplug_ops) {
366 mdev->hotplug_ops->del(mdev, dev);
367 return;
368 }
369
370 device_remove_user(&iface->main_dev);
371 }
372
373 int
374 interface_add_link(struct interface *iface, struct device *dev)
375 {
376 struct device *mdev = iface->main_dev.dev;
377
378 if (mdev && mdev->hotplug_ops)
379 return mdev->hotplug_ops->add(mdev, dev);
380
381 if (iface->main_dev.dev)
382 interface_remove_link(iface, NULL);
383
384 device_add_user(&iface->main_dev, dev);
385
386 return 0;
387 }
388
389 int
390 interface_set_up(struct interface *iface)
391 {
392 iface->autostart = true;
393
394 if (iface->state != IFS_DOWN)
395 return 0;
396
397 interface_clear_errors(iface);
398 if (!iface->available) {
399 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
400 return -1;
401 }
402
403 return __interface_set_up(iface);
404 }
405
406 int
407 interface_set_down(struct interface *iface)
408 {
409 if (!iface) {
410 vlist_for_each_element(&interfaces, iface, node)
411 __interface_set_down(iface, false);
412 } else {
413 iface->autostart = false;
414 __interface_set_down(iface, false);
415 }
416
417 return 0;
418 }
419
420 void
421 interface_start_pending(void)
422 {
423 struct interface *iface;
424
425 vlist_for_each_element(&interfaces, iface, node) {
426 if (iface->available && iface->autostart)
427 interface_set_up(iface);
428 }
429 }
430
431 static void
432 set_config_state(struct interface *iface, enum interface_config_state s)
433 {
434 iface->config_state = s;
435 if (iface->state == IFS_DOWN)
436 interface_handle_config_change(iface);
437 else
438 __interface_set_down(iface, false);
439 }
440
441 static void
442 interface_change_config(struct interface *if_old, struct interface *if_new)
443 {
444 struct blob_attr *old_config = if_old->config;
445 const char *old_ifname = if_old->ifname;
446 const struct proto_handler *proto = if_old->proto_handler;
447
448 interface_clear_errors(if_old);
449 if_old->config = if_new->config;
450 if (!if_old->config_autostart && if_new->config_autostart)
451 if_old->autostart = true;
452
453 if_old->config_autostart = if_new->config_autostart;
454 if_old->ifname = if_new->ifname;
455 if_old->proto_handler = if_new->proto_handler;
456
457 if (strcmp(old_ifname, if_new->ifname) != 0 ||
458 proto != if_new->proto_handler) {
459 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
460 if_old->name);
461 goto reload;
462 }
463
464 if (!proto->config_params)
465 D(INTERFACE, "No config parameters for interface '%s'\n",
466 if_old->name);
467 else if (!config_check_equal(old_config, if_new->config,
468 proto->config_params)) {
469 D(INTERFACE, "Reload interface '%s because of config changes\n",
470 if_old->name);
471 goto reload;
472 }
473
474 goto out;
475
476 reload:
477 set_config_state(if_old, IFC_RELOAD);
478 out:
479 free(old_config);
480 free(if_new);
481 }
482
483 static void
484 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
485 struct vlist_node *node_old)
486 {
487 struct interface *if_old = container_of(node_old, struct interface, node);
488 struct interface *if_new = container_of(node_new, struct interface, node);
489
490 if (node_old && node_new) {
491 D(INTERFACE, "Update interface '%s'\n", if_new->name);
492 interface_change_config(if_old, if_new);
493 } else if (node_old) {
494 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
495 set_config_state(if_old, IFC_REMOVE);
496 } else if (node_new) {
497 D(INTERFACE, "Create interface '%s'\n", if_new->name);
498 interface_claim_device(if_new);
499 proto_init_interface(if_new, if_new->config);
500 interface_ip_init(if_new);
501 netifd_ubus_add_interface(if_new);
502 }
503 }
504
505
506 static void __init
507 interface_init_list(void)
508 {
509 vlist_init(&interfaces, avl_strcmp, interface_update,
510 struct interface, node, name);
511 interfaces.keep_old = true;
512 interfaces.no_delete = true;
513 }