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