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_MAX
  47 };
  48
  49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  50         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  64         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  65 };
  66
  67 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  68         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  70 };
  71
  72 const struct uci_blob_param_list interface_attr_list = {
  73         .n_params = IFACE_ATTR_MAX,
  74         .params = iface_attrs,
  75         .info = iface_attr_info,
  76 };
  77
  78 static void
  79 interface_clear_errors(struct interface *iface)
  80 {
  81         struct interface_error *error, *tmp;
  82
  83         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  84                 list_del(&error->list);
  85                 free(error);
  86         }
  87 }
  88
  89 void interface_add_error(struct interface *iface, const char *subsystem,
  90                          const char *code, const char **data, int n_data)
  91 {
  92         struct interface_error *error;
  93         int i, len = 0;
  94         int *datalen = NULL;
  95         char *dest, *d_subsys, *d_code;
  96
  97         if (n_data) {
  98                 len = n_data * sizeof(char *);
  99                 datalen = alloca(len);
 100                 for (i = 0; i < n_data; i++) {
 101                         datalen[i] = strlen(data[i]) + 1;
 102                         len += datalen[i];
 103                 }
 104         }
 105
 106         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 107                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 108                 &d_code, code ? strlen(code) + 1 : 0);
 109         if (!error)
 110                 return;
 111
 112         list_add_tail(&error->list, &iface->errors);
 113
 114         dest = (char *) &error->data[n_data + 1];
 115         for (i = 0; i < n_data; i++) {
 116                 error->data[i] = dest;
 117                 memcpy(dest, data[i], datalen[i]);
 118                 dest += datalen[i];
 119         }
 120         error->data[n_data++] = NULL;
 121
 122         if (subsystem)
 123                 error->subsystem = strcpy(d_subsys, subsystem);
 124
 125         if (code)
 126                 error->code = strcpy(d_code, code);
 127 }
 128
 129 static void
 130 interface_data_del(struct interface *iface, struct interface_data *data)
 131 {
 132         avl_delete(&iface->data, &data->node);
 133         free(data);
 134 }
 135
 136 static void
 137 interface_data_flush(struct interface *iface)
 138 {
 139         struct interface_data *d, *tmp;
 140
 141         avl_for_each_element_safe(&iface->data, d, node, tmp)
 142                 interface_data_del(iface, d);
 143 }
 144
 145 int
 146 interface_add_data(struct interface *iface, const struct blob_attr *data)
 147 {
 148         struct interface_data *n, *o;
 149
 150         if (!blobmsg_check_attr(data, true))
 151                 return UBUS_STATUS_INVALID_ARGUMENT;
 152
 153         const char *name = blobmsg_name(data);
 154         unsigned len = blob_pad_len(data);
 155
 156         o = avl_find_element(&iface->data, name, o, node);
 157         if (o) {
 158                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 159                         return 0;
 160
 161                 interface_data_del(iface, o);
 162         }
 163
 164         n = calloc(1, sizeof(*n) + len);
 165         memcpy(n->data, data, len);
 166         n->node.key = blobmsg_name(n->data);
 167         avl_insert(&iface->data, &n->node);
 168
 169         iface->updated |= IUF_DATA;
 170         return 0;
 171 }
 172
 173 static void
 174 interface_event(struct interface *iface, enum interface_event ev)
 175 {
 176         struct interface_user *dep, *tmp;
 177         struct device *adev = NULL;
 178
 179         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 180                 dep->cb(dep, iface, ev);
 181
 182         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 183                 dep->cb(dep, iface, ev);
 184
 185         switch (ev) {
 186         case IFEV_UP:
 187                 adev = iface->l3_dev.dev;
 188                 /* fall through */
 189         case IFEV_DOWN:
 190                 alias_notify_device(iface->name, adev);
 191                 break;
 192         default:
 193                 break;
 194         }
 195 }
 196
 197 static void
 198 interface_flush_state(struct interface *iface)
 199 {
 200         if (iface->l3_dev.dev)
 201                 device_release(&iface->l3_dev);
 202         interface_data_flush(iface);
 203 }
 204
 205 static void
 206 mark_interface_down(struct interface *iface)
 207 {
 208         enum interface_state state = iface->state;
 209
 210         if (state == IFS_DOWN)
 211                 return;
 212
 213         iface->state = IFS_DOWN;
 214         if (state == IFS_UP)
 215                 interface_event(iface, IFEV_DOWN);
 216         interface_ip_set_enabled(&iface->config_ip, false);
 217         interface_ip_flush(&iface->proto_ip);
 218         interface_flush_state(iface);
 219         system_flush_routes();
 220 }
 221
 222 void
 223 __interface_set_down(struct interface *iface, bool force)
 224 {
 225         enum interface_state state = iface->state;
 226         switch (state) {
 227         case IFS_UP:
 228         case IFS_SETUP:
 229                 iface->state = IFS_TEARDOWN;
 230                 if (state == IFS_UP)
 231                         interface_event(iface, IFEV_DOWN);
 232
 233                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 234                 if (force)
 235                         interface_flush_state(iface);
 236
 237                 if (iface->dynamic)
 238                         vlist_delete(&interfaces, &iface->node);
 239                 break;
 240
 241         case IFS_DOWN:
 242                 if (iface->main_dev.dev)
 243                         device_release(&iface->main_dev);
 244         case IFS_TEARDOWN:
 245         default:
 246                 break;
 247         }
 248 }
 249
 250 static int
 251 __interface_set_up(struct interface *iface)
 252 {
 253         int ret;
 254
 255         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 256
 257         iface->state = IFS_SETUP;
 258         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 259         if (ret)
 260                 mark_interface_down(iface);
 261
 262         return ret;
 263 }
 264
 265 static void
 266 interface_check_state(struct interface *iface)
 267 {
 268         switch (iface->state) {
 269         case IFS_UP:
 270                 if (!iface->enabled || !iface->link_state) {
 271                         mark_interface_down(iface);
 272                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 273                 }
 274                 break;
 275         case IFS_DOWN:
 276                 if (iface->autostart && iface->enabled && iface->link_state && !config_init)
 277                         __interface_set_up(iface);
 278                 break;
 279         default:
 280                 break;
 281         }
 282 }
 283
 284 static void
 285 interface_set_enabled(struct interface *iface, bool new_state)
 286 {
 287         if (iface->enabled == new_state)
 288                 return;
 289
 290         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 291         iface->enabled = new_state;
 292         interface_check_state(iface);
 293 }
 294
 295 static void
 296 interface_set_link_state(struct interface *iface, bool new_state)
 297 {
 298         if (iface->link_state == new_state)
 299                 return;
 300
 301         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 302         iface->link_state = new_state;
 303         interface_check_state(iface);
 304 }
 305
 306 static void
 307 interface_cb(struct device_user *dep, enum device_event ev)
 308 {
 309         struct interface *iface;
 310         bool new_state = false;
 311
 312         iface = container_of(dep, struct interface, main_dev);
 313         switch (ev) {
 314         case DEV_EVENT_ADD:
 315                 new_state = true;
 316         case DEV_EVENT_REMOVE:
 317                 interface_set_available(iface, new_state);
 318                 if (!new_state && dep->dev->external)
 319                         interface_set_main_dev(iface, NULL);
 320                 break;
 321         case DEV_EVENT_UP:
 322                 new_state = true;
 323         case DEV_EVENT_DOWN:
 324                 interface_set_enabled(iface, new_state);
 325                 break;
 326         case DEV_EVENT_LINK_UP:
 327                 new_state = true;
 328         case DEV_EVENT_LINK_DOWN:
 329                 interface_set_link_state(iface, new_state);
 330                 break;
 331         case DEV_EVENT_TOPO_CHANGE:
 332                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 333                 return;
 334         default:
 335                 break;
 336         }
 337 }
 338
 339 void
 340 interface_set_available(struct interface *iface, bool new_state)
 341 {
 342         if (iface->available == new_state)
 343                 return;
 344
 345         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 346         iface->available = new_state;
 347
 348         if (new_state) {
 349                 if (iface->autostart && !config_init)
 350                         interface_set_up(iface);
 351         } else
 352                 __interface_set_down(iface, true);
 353 }
 354
 355 void
 356 interface_add_user(struct interface_user *dep, struct interface *iface)
 357 {
 358         if (!iface) {
 359                 list_add(&dep->list, &iface_all_users);
 360                 return;
 361         }
 362
 363         dep->iface = iface;
 364         list_add(&dep->list, &iface->users);
 365         if (iface->state == IFS_UP)
 366                 dep->cb(dep, iface, IFEV_UP);
 367 }
 368
 369 void
 370 interface_remove_user(struct interface_user *dep)
 371 {
 372         list_del_init(&dep->list);
 373         dep->iface = NULL;
 374 }
 375
 376 static void
 377 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 378 {
 379         struct blob_attr *cur;
 380         int rem;
 381
 382         blobmsg_for_each_attr(cur, list, rem) {
 383                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 384                         continue;
 385
 386                 if (!blobmsg_check_attr(cur, NULL))
 387                         continue;
 388
 389                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 390                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 391                 list_add(&c->head, &iface->assignment_classes);
 392         }
 393 }
 394
 395 static void
 396 interface_clear_assignment_classes(struct interface *iface)
 397 {
 398         while (!list_empty(&iface->assignment_classes)) {
 399                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 400                                 struct interface_assignment_class, head);
 401                 list_del(&c->head);
 402                 free(c);
 403         }
 404 }
 405
 406 static void
 407 interface_merge_assignment_data(struct interface *old, struct interface *new)
 408 {
 409         bool changed = (old->assignment_hint != new->assignment_hint ||
 410                         old->assignment_length != new->assignment_length ||
 411                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 412
 413         struct interface_assignment_class *c;
 414         list_for_each_entry(c, &new->assignment_classes, head) {
 415                 // Compare list entries one-by-one to see if there was a change
 416                 if (list_empty(&old->assignment_classes)) // The new list is longer
 417                         changed = true;
 418
 419                 if (changed)
 420                         break;
 421
 422                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 423                                 struct interface_assignment_class, head);
 424
 425                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 426                         break;
 427
 428                 list_del(&c_old->head);
 429                 free(c_old);
 430         }
 431
 432         // The old list was longer than the new one or the last entry didn't match
 433         if (!list_empty(&old->assignment_classes)) {
 434                 interface_clear_assignment_classes(old);
 435                 changed = true;
 436         }
 437
 438         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 439
 440         if (changed) {
 441                 old->assignment_hint = new->assignment_hint;
 442                 old->assignment_length = new->assignment_length;
 443                 interface_refresh_assignments(true);
 444         }
 445 }
 446
 447 static void
 448 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 449 {
 450         struct interface *alias = container_of(dep, struct interface, parent_iface);
 451         struct device *dev = iface->l3_dev.dev;
 452
 453         switch (ev) {
 454         case IFEV_UP:
 455                 if (!dev)
 456                         return;
 457
 458                 interface_set_main_dev(alias, dev);
 459                 interface_set_available(alias, true);
 460                 break;
 461         case IFEV_DOWN:
 462                 interface_set_available(alias, false);
 463                 interface_set_main_dev(alias, NULL);
 464                 break;
 465         case IFEV_FREE:
 466                 interface_remove_user(dep);
 467                 break;
 468         case IFEV_RELOAD:
 469         case IFEV_UPDATE:
 470                 break;
 471         }
 472 }
 473
 474 static void
 475 interface_claim_device(struct interface *iface)
 476 {
 477         struct interface *parent;
 478         struct device *dev = NULL;
 479
 480         if (iface->parent_iface.iface)
 481                 interface_remove_user(&iface->parent_iface);
 482
 483         if (iface->parent_ifname) {
 484                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 485                 iface->parent_iface.cb = interface_alias_cb;
 486                 interface_add_user(&iface->parent_iface, parent);
 487         } else if (iface->ifname &&
 488                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 489                 dev = device_get(iface->ifname, true);
 490         }
 491
 492         if (dev)
 493                 interface_set_main_dev(iface, dev);
 494
 495         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 496                 interface_set_available(iface, true);
 497 }
 498
 499 static void
 500 interface_cleanup_state(struct interface *iface)
 501 {
 502         interface_set_available(iface, false);
 503
 504         interface_flush_state(iface);
 505         interface_clear_errors(iface);
 506         interface_set_proto_state(iface, NULL);
 507
 508         if (iface->main_dev.dev)
 509                 interface_set_main_dev(iface, NULL);
 510 }
 511
 512 static void
 513 interface_cleanup(struct interface *iface)
 514 {
 515         struct interface_user *dep, *tmp;
 516
 517         if (iface->parent_iface.iface)
 518                 interface_remove_user(&iface->parent_iface);
 519
 520         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 521                 interface_remove_user(dep);
 522
 523         interface_clear_assignment_classes(iface);
 524         interface_ip_flush(&iface->config_ip);
 525         interface_cleanup_state(iface);
 526 }
 527
 528 static void
 529 interface_do_free(struct interface *iface)
 530 {
 531         interface_event(iface, IFEV_FREE);
 532         interface_cleanup(iface);
 533         free(iface->config);
 534         netifd_ubus_remove_interface(iface);
 535         avl_delete(&interfaces.avl, &iface->node.avl);
 536         free(iface);
 537 }
 538
 539 static void
 540 interface_do_reload(struct interface *iface)
 541 {
 542         interface_event(iface, IFEV_RELOAD);
 543         interface_cleanup_state(iface);
 544         proto_init_interface(iface, iface->config);
 545         interface_claim_device(iface);
 546 }
 547
 548 static void
 549 interface_handle_config_change(struct interface *iface)
 550 {
 551         enum interface_config_state state = iface->config_state;
 552
 553         iface->config_state = IFC_NORMAL;
 554         switch(state) {
 555         case IFC_NORMAL:
 556                 break;
 557         case IFC_RELOAD:
 558                 interface_do_reload(iface);
 559                 break;
 560         case IFC_REMOVE:
 561                 interface_do_free(iface);
 562                 return;
 563         }
 564         if (iface->autostart && iface->available)
 565                 interface_set_up(iface);
 566 }
 567
 568 static void
 569 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 570 {
 571         struct interface *iface = state->iface;
 572
 573         switch (ev) {
 574         case IFPEV_UP:
 575                 if (iface->state != IFS_SETUP) {
 576                         interface_event(iface, IFEV_UPDATE);
 577                         return;
 578                 }
 579
 580                 interface_ip_set_enabled(&iface->config_ip, true);
 581                 system_flush_routes();
 582                 iface->state = IFS_UP;
 583                 iface->start_time = system_get_rtime();
 584                 interface_event(iface, IFEV_UP);
 585                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 586                 break;
 587         case IFPEV_DOWN:
 588                 if (iface->state == IFS_DOWN)
 589                         return;
 590
 591                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 592                 mark_interface_down(iface);
 593                 if (iface->main_dev.dev)
 594                         device_release(&iface->main_dev);
 595                 interface_handle_config_change(iface);
 596                 break;
 597         case IFPEV_LINK_LOST:
 598                 if (iface->state != IFS_UP)
 599                         return;
 600
 601                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 602                 mark_interface_down(iface);
 603                 iface->state = IFS_SETUP;
 604                 break;
 605         default:
 606                 return;
 607         }
 608
 609         interface_write_resolv_conf();
 610 }
 611
 612 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 613 {
 614         if (iface->proto) {
 615                 iface->proto->free(iface->proto);
 616                 iface->proto = NULL;
 617         }
 618         iface->state = IFS_DOWN;
 619         iface->proto = state;
 620         if (!state)
 621                 return;
 622
 623         state->proto_event = interface_proto_cb;
 624         state->iface = iface;
 625 }
 626
 627 struct interface *
 628 interface_alloc(const char *name, struct blob_attr *config)
 629 {
 630         struct interface *iface;
 631         struct blob_attr *tb[IFACE_ATTR_MAX];
 632         struct blob_attr *cur;
 633         const char *proto_name = NULL;
 634         char *iface_name;
 635
 636         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 637         iface->name = strcpy(iface_name, name);
 638         INIT_LIST_HEAD(&iface->errors);
 639         INIT_LIST_HEAD(&iface->users);
 640         INIT_LIST_HEAD(&iface->hotplug_list);
 641         INIT_LIST_HEAD(&iface->assignment_classes);
 642         interface_ip_init(iface);
 643         avl_init(&iface->data, avl_strcmp, false, NULL);
 644         iface->config_ip.enabled = false;
 645
 646         iface->main_dev.cb = interface_cb;
 647
 648         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 649                       blob_data(config), blob_len(config));
 650
 651         if ((cur = tb[IFACE_ATTR_PROTO]))
 652                 proto_name = blobmsg_data(cur);
 653
 654         proto_attach_interface(iface, proto_name);
 655
 656         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 657         iface->proto_ip.no_defaultroute =
 658                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 659         iface->proto_ip.no_dns =
 660                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 661
 662         if ((cur = tb[IFACE_ATTR_DNS]))
 663                 interface_add_dns_server_list(&iface->config_ip, cur);
 664
 665         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 666                 interface_add_dns_search_list(&iface->config_ip, cur);
 667
 668         if ((cur = tb[IFACE_ATTR_METRIC]))
 669                 iface->metric = blobmsg_get_u32(cur);
 670
 671         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 672                 iface->assignment_length = blobmsg_get_u32(cur);
 673
 674         iface->assignment_hint = -1;
 675         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 676                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 677                                 ~((1 << (64 - iface->assignment_length)) - 1);
 678
 679         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 680                 interface_add_assignment_classes(iface, cur);
 681
 682
 683         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 684                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 685                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 686         }
 687
 688         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 689                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 690                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 691         }
 692
 693         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 694
 695         iface->config_autostart = iface->autostart;
 696         return iface;
 697 }
 698
 699 void interface_set_dynamic(struct interface *iface)
 700 {
 701         iface->dynamic = true;
 702         iface->node.version = -1; // Don't delete on reload
 703 }
 704
 705 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 706 {
 707         struct blob_attr *tb[IFACE_ATTR_MAX];
 708         struct blob_attr *cur;
 709
 710         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 711                       blob_data(config), blob_len(config));
 712
 713         if (alias) {
 714                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 715                         iface->parent_ifname = blobmsg_data(cur);
 716
 717                 if (!iface->parent_ifname)
 718                         return false;
 719         } else {
 720                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 721                         iface->ifname = blobmsg_data(cur);
 722         }
 723
 724
 725         iface->config = config;
 726         vlist_add(&interfaces, &iface->node, iface->name);
 727         return true;
 728 }
 729
 730 void
 731 interface_add(struct interface *iface, struct blob_attr *config)
 732 {
 733         __interface_add(iface, config, false);
 734 }
 735
 736 bool
 737 interface_add_alias(struct interface *iface, struct blob_attr *config)
 738 {
 739         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 740                 return false;
 741
 742         return __interface_add(iface, config, true);
 743 }
 744
 745 void
 746 interface_set_l3_dev(struct interface *iface, struct device *dev)
 747 {
 748         bool enabled = iface->config_ip.enabled;
 749         bool claimed = iface->l3_dev.claimed;
 750
 751         if (iface->l3_dev.dev == dev)
 752                 return;
 753
 754         interface_ip_set_enabled(&iface->config_ip, false);
 755         interface_ip_flush(&iface->proto_ip);
 756         device_add_user(&iface->l3_dev, dev);
 757
 758         if (dev) {
 759                 if (claimed)
 760                         device_claim(&iface->l3_dev);
 761                 interface_ip_set_enabled(&iface->config_ip, enabled);
 762         }
 763 }
 764
 765 void
 766 interface_set_main_dev(struct interface *iface, struct device *dev)
 767 {
 768         bool set_l3 = (!dev || iface->main_dev.dev == iface->l3_dev.dev);
 769         bool claimed = iface->l3_dev.claimed;
 770
 771         if (iface->main_dev.dev == dev)
 772                 return;
 773
 774         if (set_l3)
 775                 interface_set_l3_dev(iface, dev);
 776
 777         device_add_user(&iface->main_dev, dev);
 778         if (!dev) {
 779                 interface_set_link_state(iface, false);
 780                 return;
 781         }
 782
 783         if (claimed)
 784                 device_claim(&iface->l3_dev);
 785
 786         if (!iface->l3_dev.dev)
 787                 interface_set_l3_dev(iface, dev);
 788 }
 789
 790 int
 791 interface_remove_link(struct interface *iface, struct device *dev)
 792 {
 793         struct device *mdev = iface->main_dev.dev;
 794
 795         if (mdev && mdev->hotplug_ops)
 796                 return mdev->hotplug_ops->del(mdev, dev);
 797
 798         if (!iface->main_dev.hotplug)
 799                 return UBUS_STATUS_INVALID_ARGUMENT;
 800
 801         if (dev != iface->main_dev.dev)
 802                 return UBUS_STATUS_INVALID_ARGUMENT;
 803
 804         device_remove_user(&iface->main_dev);
 805         return 0;
 806 }
 807
 808 int
 809 interface_add_link(struct interface *iface, struct device *dev)
 810 {
 811         struct device *mdev = iface->main_dev.dev;
 812
 813         if (mdev == dev)
 814                 return 0;
 815
 816         if (iface->main_dev.hotplug)
 817                 device_remove_user(&iface->main_dev);
 818
 819         if (mdev) {
 820                 if (mdev->hotplug_ops)
 821                         return mdev->hotplug_ops->add(mdev, dev);
 822                 else
 823                         return UBUS_STATUS_NOT_SUPPORTED;
 824         }
 825
 826         interface_set_main_dev(iface, dev);
 827         iface->main_dev.hotplug = true;
 828         return 0;
 829 }
 830
 831 int
 832 interface_handle_link(struct interface *iface, const char *name, bool add)
 833 {
 834         struct device *dev;
 835         int ret;
 836
 837         device_lock();
 838
 839         dev = device_get(name, add ? 2 : 0);
 840         if (!dev) {
 841                 ret = UBUS_STATUS_NOT_FOUND;
 842                 goto out;
 843         }
 844
 845         if (add) {
 846                 device_set_present(dev, true);
 847                 if (iface->device_config)
 848                         device_set_config(dev, &simple_device_type, iface->config);
 849
 850                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 851                 ret = interface_add_link(iface, dev);
 852         } else {
 853                 ret = interface_remove_link(iface, dev);
 854         }
 855
 856 out:
 857         device_unlock();
 858
 859         return ret;
 860 }
 861
 862 int
 863 interface_set_up(struct interface *iface)
 864 {
 865         int ret;
 866
 867         iface->autostart = true;
 868
 869         if (iface->state != IFS_DOWN)
 870                 return 0;
 871
 872         interface_clear_errors(iface);
 873         if (!iface->available) {
 874                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 875                 return -1;
 876         }
 877
 878         if (iface->main_dev.dev) {
 879                 ret = device_claim(&iface->main_dev);
 880                 if (!ret)
 881                         interface_check_state(iface);
 882         }
 883         else
 884                 ret = __interface_set_up(iface);
 885
 886         return ret;
 887 }
 888
 889 int
 890 interface_set_down(struct interface *iface)
 891 {
 892         if (!iface) {
 893                 vlist_for_each_element(&interfaces, iface, node)
 894                         __interface_set_down(iface, false);
 895         } else {
 896                 iface->autostart = false;
 897                 __interface_set_down(iface, false);
 898         }
 899
 900         return 0;
 901 }
 902
 903 void
 904 interface_start_pending(void)
 905 {
 906         struct interface *iface;
 907
 908         vlist_for_each_element(&interfaces, iface, node) {
 909                 if (iface->available && iface->autostart)
 910                         interface_set_up(iface);
 911         }
 912 }
 913
 914 static void
 915 set_config_state(struct interface *iface, enum interface_config_state s)
 916 {
 917         iface->config_state = s;
 918         if (iface->state == IFS_DOWN)
 919                 interface_handle_config_change(iface);
 920         else
 921                 __interface_set_down(iface, false);
 922 }
 923
 924 void
 925 interface_update_start(struct interface *iface)
 926 {
 927         iface->updated = 0;
 928         interface_ip_update_start(&iface->proto_ip);
 929 }
 930
 931 void
 932 interface_update_complete(struct interface *iface)
 933 {
 934         interface_ip_update_complete(&iface->proto_ip);
 935 }
 936
 937 static void
 938 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 939 {
 940         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 941         vlist_simple_replace(&new->dns_search, &old->dns_search);
 942 }
 943
 944 static void
 945 interface_change_config(struct interface *if_old, struct interface *if_new)
 946 {
 947         struct blob_attr *old_config = if_old->config;
 948         bool reload = false, reload_ip = false;
 949
 950 #define FIELD_CHANGED_STR(field)                                        \
 951                 ((!!if_old->field != !!if_new->field) ||                \
 952                  (if_old->field &&                                      \
 953                   strcmp(if_old->field, if_new->field) != 0))
 954
 955         if (FIELD_CHANGED_STR(parent_ifname)) {
 956                 if (if_old->parent_iface.iface)
 957                         interface_remove_user(&if_old->parent_iface);
 958                 reload = true;
 959         }
 960
 961         if (FIELD_CHANGED_STR(ifname) ||
 962             if_old->proto_handler != if_new->proto_handler)
 963                 reload = true;
 964
 965         if (!if_old->proto_handler->config_params)
 966                 D(INTERFACE, "No config parameters for interface '%s'\n",
 967                   if_old->name);
 968         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 969                                        if_old->proto_handler->config_params))
 970                 reload = true;
 971
 972 #define UPDATE(field, __var) ({                                         \
 973                 bool __changed = (if_old->field != if_new->field);      \
 974                 if_old->field = if_new->field;                          \
 975                 __var |= __changed;                                     \
 976         })
 977
 978         if_old->config = if_new->config;
 979         if (!if_old->config_autostart && if_new->config_autostart)
 980                 if_old->autostart = true;
 981
 982         if_old->device_config = if_new->device_config;
 983         if_old->config_autostart = if_new->config_autostart;
 984         if_old->ifname = if_new->ifname;
 985         if_old->parent_ifname = if_new->parent_ifname;
 986         if_old->proto_handler = if_new->proto_handler;
 987
 988         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 989         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 990
 991         UPDATE(metric, reload_ip);
 992         UPDATE(proto_ip.no_defaultroute, reload_ip);
 993         UPDATE(ip4table, reload_ip);
 994         UPDATE(ip6table, reload_ip);
 995         interface_merge_assignment_data(if_old, if_new);
 996
 997 #undef UPDATE
 998
 999         if (reload) {
1000                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1001                   if_old->name);
1002                 interface_clear_errors(if_old);
1003                 set_config_state(if_old, IFC_RELOAD);
1004                 goto out;
1005         }
1006
1007         if (reload_ip) {
1008                 interface_ip_set_enabled(&if_old->config_ip, false);
1009                 interface_ip_set_enabled(&if_old->proto_ip, false);
1010                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1011                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1012         }
1013
1014         interface_write_resolv_conf();
1015
1016 out:
1017         if_new->config = NULL;
1018         interface_cleanup(if_new);
1019         free(old_config);
1020         free(if_new);
1021 }
1022
1023 static void
1024 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1025                  struct vlist_node *node_old)
1026 {
1027         struct interface *if_old = container_of(node_old, struct interface, node);
1028         struct interface *if_new = container_of(node_new, struct interface, node);
1029
1030         if (node_old && node_new) {
1031                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1032                 interface_change_config(if_old, if_new);
1033         } else if (node_old) {
1034                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1035                 set_config_state(if_old, IFC_REMOVE);
1036         } else if (node_new) {
1037                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1038                 proto_init_interface(if_new, if_new->config);
1039                 interface_claim_device(if_new);
1040                 netifd_ubus_add_interface(if_new);
1041         }
1042 }
1043
1044
1045 static void __init
1046 interface_init_list(void)
1047 {
1048         vlist_init(&interfaces, avl_strcmp, interface_update);
1049         interfaces.keep_old = true;
1050         interfaces.no_delete = true;
1051 }