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