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_MAX
  41 };
  42
  43 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  44         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  45         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  46         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  47         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  48         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  49         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  50         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  51         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  52         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  53 };
  54
  55 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  56         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  57 };
  58
  59 const struct config_param_list interface_attr_list = {
  60         .n_params = IFACE_ATTR_MAX,
  61         .params = iface_attrs,
  62         .info = iface_attr_info,
  63 };
  64
  65 static void
  66 interface_clear_errors(struct interface *iface)
  67 {
  68         struct interface_error *error, *tmp;
  69
  70         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  71                 list_del(&error->list);
  72                 free(error);
  73         }
  74 }
  75
  76 void interface_add_error(struct interface *iface, const char *subsystem,
  77                          const char *code, const char **data, int n_data)
  78 {
  79         struct interface_error *error;
  80         int i, len = 0;
  81         int *datalen = NULL;
  82         char *dest;
  83
  84         if (n_data) {
  85                 len = n_data * sizeof(char *);
  86                 datalen = alloca(len);
  87                 for (i = 0; i < n_data; i++) {
  88                         datalen[i] = strlen(data[i]) + 1;
  89                         len += datalen[i];
  90                 }
  91         }
  92
  93         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  94         if (!error)
  95                 return;
  96
  97         list_add_tail(&error->list, &iface->errors);
  98         error->subsystem = subsystem;
  99         error->code = code;
 100
 101         dest = (char *) &error->data[n_data + 1];
 102         for (i = 0; i < n_data; i++) {
 103                 error->data[i] = dest;
 104                 memcpy(dest, data[i], datalen[i]);
 105                 dest += datalen[i];
 106         }
 107         error->data[n_data] = NULL;
 108 }
 109
 110 static void
 111 interface_data_del(struct interface *iface, struct interface_data *data)
 112 {
 113         avl_delete(&iface->data, &data->node);
 114         free(data);
 115 }
 116
 117 static void
 118 interface_data_flush(struct interface *iface)
 119 {
 120         struct interface_data *d, *tmp;
 121
 122         avl_for_each_element_safe(&iface->data, d, node, tmp)
 123                 interface_data_del(iface, d);
 124 }
 125
 126 int
 127 interface_add_data(struct interface *iface, const struct blob_attr *data)
 128 {
 129         struct interface_data *n, *o;
 130
 131         if (!blobmsg_check_attr(data, true))
 132                 return UBUS_STATUS_INVALID_ARGUMENT;
 133
 134         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 135         memcpy(n->data, data, blob_pad_len(data));
 136         n->node.key = blobmsg_name(data);
 137
 138         o = avl_find_element(&iface->data, n->node.key, o, node);
 139         if (o)
 140                 interface_data_del(iface, o);
 141
 142         avl_insert(&iface->data, &n->node);
 143         return 0;
 144 }
 145
 146 static void
 147 interface_event(struct interface *iface, enum interface_event ev)
 148 {
 149         struct interface_user *dep, *tmp;
 150         struct device *adev = NULL;
 151
 152         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 153                 dep->cb(dep, iface, ev);
 154
 155         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 156                 dep->cb(dep, iface, ev);
 157
 158         switch (ev) {
 159         case IFEV_UP:
 160                 adev = iface->main_dev.dev;
 161                 /* fall through */
 162         case IFEV_DOWN:
 163                 alias_notify_device(iface->name, adev);
 164                 break;
 165         default:
 166                 break;
 167         }
 168 }
 169
 170 static void
 171 interface_flush_state(struct interface *iface)
 172 {
 173         if (iface->main_dev.dev)
 174                 device_release(&iface->main_dev);
 175         if (iface->l3_dev.dev)
 176                 device_release(&iface->l3_dev);
 177         interface_data_flush(iface);
 178 }
 179
 180 static void
 181 mark_interface_down(struct interface *iface)
 182 {
 183         enum interface_state state = iface->state;
 184
 185         iface->state = IFS_DOWN;
 186         if (state == IFS_UP)
 187                 interface_event(iface, IFEV_DOWN);
 188         interface_ip_set_enabled(&iface->config_ip, false);
 189         interface_ip_flush(&iface->proto_ip);
 190         interface_flush_state(iface);
 191         system_flush_routes();
 192 }
 193
 194 void
 195 __interface_set_down(struct interface *iface, bool force)
 196 {
 197         interface_clear_errors(iface);
 198
 199         if (iface->state == IFS_DOWN ||
 200                 iface->state == IFS_TEARDOWN)
 201                 return;
 202
 203         if (iface->state == IFS_UP)
 204                 interface_event(iface, IFEV_DOWN);
 205         iface->state = IFS_TEARDOWN;
 206         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 207         if (force)
 208                 interface_flush_state(iface);
 209 }
 210
 211 static void
 212 interface_cb(struct device_user *dep, enum device_event ev)
 213 {
 214         struct interface *iface;
 215         bool new_state;
 216
 217         iface = container_of(dep, struct interface, main_dev);
 218         switch (ev) {
 219         case DEV_EVENT_ADD:
 220                 new_state = true;
 221                 break;
 222         case DEV_EVENT_REMOVE:
 223                 new_state = false;
 224                 break;
 225         default:
 226                 return;
 227         }
 228
 229         interface_set_available(iface, new_state);
 230         if (!new_state && dep->dev->external)
 231                 interface_set_main_dev(iface, NULL);
 232 }
 233
 234 void
 235 interface_set_available(struct interface *iface, bool new_state)
 236 {
 237         if (iface->available == new_state)
 238                 return;
 239
 240         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 241         iface->available = new_state;
 242
 243         if (new_state) {
 244                 if (iface->autostart && !config_init)
 245                         interface_set_up(iface);
 246         } else
 247                 __interface_set_down(iface, true);
 248 }
 249
 250 void
 251 interface_add_user(struct interface_user *dep, struct interface *iface)
 252 {
 253         if (!iface) {
 254                 list_add(&dep->list, &iface_all_users);
 255                 return;
 256         }
 257
 258         dep->iface = iface;
 259         list_add(&dep->list, &iface->users);
 260         if (iface->state == IFS_UP)
 261                 dep->cb(dep, iface, IFEV_UP);
 262 }
 263
 264 void
 265 interface_remove_user(struct interface_user *dep)
 266 {
 267         list_del_init(&dep->list);
 268         dep->iface = NULL;
 269 }
 270
 271 static void
 272 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 273 {
 274         struct interface *alias = container_of(dep, struct interface, parent_iface);
 275         struct device *dev = iface->l3_dev.dev;
 276
 277         switch (ev) {
 278         case IFEV_UP:
 279                 if (!dev)
 280                         return;
 281
 282                 interface_set_main_dev(alias, dev);
 283                 interface_set_available(alias, true);
 284                 break;
 285         case IFEV_DOWN:
 286                 interface_set_available(alias, false);
 287                 interface_set_main_dev(alias, NULL);
 288                 break;
 289         case IFEV_FREE:
 290                 interface_remove_user(dep);
 291                 break;
 292         case IFEV_RELOAD:
 293                 break;
 294         }
 295 }
 296
 297 static void
 298 interface_claim_device(struct interface *iface)
 299 {
 300         struct interface *parent;
 301         struct device *dev = NULL;
 302
 303         if (iface->parent_iface.iface)
 304                 interface_remove_user(&iface->parent_iface);
 305
 306         if (iface->parent_ifname) {
 307                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 308                 iface->parent_iface.cb = interface_alias_cb;
 309                 interface_add_user(&iface->parent_iface, parent);
 310         } else if (iface->ifname &&
 311                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 312                 dev = device_get(iface->ifname, true);
 313         }
 314
 315         if (dev)
 316                 interface_set_main_dev(iface, dev);
 317
 318         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 319                 interface_set_available(iface, true);
 320 }
 321
 322
 323 static void
 324 interface_cleanup(struct interface *iface, bool reload)
 325 {
 326         struct interface_user *dep, *tmp;
 327
 328         if (iface->parent_iface.iface)
 329                 interface_remove_user(&iface->parent_iface);
 330
 331         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 332                 interface_remove_user(dep);
 333
 334         interface_ip_flush(&iface->config_ip);
 335         interface_flush_state(iface);
 336         interface_clear_errors(iface);
 337
 338         if (iface->main_dev.dev && !reload)
 339                 interface_set_main_dev(iface, NULL);
 340         interface_set_proto_state(iface, NULL);
 341 }
 342
 343 static void
 344 interface_do_free(struct interface *iface)
 345 {
 346         interface_event(iface, IFEV_FREE);
 347         interface_cleanup(iface, false);
 348         free(iface->config);
 349         netifd_ubus_remove_interface(iface);
 350         avl_delete(&interfaces.avl, &iface->node.avl);
 351         free(iface);
 352 }
 353
 354 static void
 355 interface_do_reload(struct interface *iface)
 356 {
 357         interface_event(iface, IFEV_RELOAD);
 358         interface_cleanup(iface, true);
 359         proto_init_interface(iface, iface->config);
 360         interface_claim_device(iface);
 361 }
 362
 363 static void
 364 interface_handle_config_change(struct interface *iface)
 365 {
 366         enum interface_config_state state = iface->config_state;
 367
 368         iface->config_state = IFC_NORMAL;
 369         switch(state) {
 370         case IFC_NORMAL:
 371                 break;
 372         case IFC_RELOAD:
 373                 interface_do_reload(iface);
 374                 break;
 375         case IFC_REMOVE:
 376                 interface_do_free(iface);
 377                 return;
 378         }
 379         if (iface->autostart && iface->available)
 380                 interface_set_up(iface);
 381 }
 382
 383 static void
 384 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 385 {
 386         struct interface *iface = state->iface;
 387
 388         switch (ev) {
 389         case IFPEV_UP:
 390                 if (iface->state != IFS_SETUP)
 391                         return;
 392
 393                 interface_ip_set_enabled(&iface->config_ip, true);
 394                 system_flush_routes();
 395                 iface->state = IFS_UP;
 396                 iface->start_time = system_get_rtime();
 397                 interface_event(iface, IFEV_UP);
 398                 interface_write_resolv_conf();
 399                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 400                 break;
 401         case IFPEV_DOWN:
 402                 if (iface->state == IFS_DOWN)
 403                         return;
 404
 405                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 406                 mark_interface_down(iface);
 407                 interface_handle_config_change(iface);
 408                 break;
 409         case IFPEV_LINK_LOST:
 410                 if (iface->state != IFS_UP)
 411                         return;
 412
 413                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 414                 mark_interface_down(iface);
 415                 iface->state = IFS_SETUP;
 416                 break;
 417         }
 418 }
 419
 420 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 421 {
 422         if (iface->proto) {
 423                 iface->proto->free(iface->proto);
 424                 iface->proto = NULL;
 425         }
 426         iface->state = IFS_DOWN;
 427         iface->proto = state;
 428         if (!state)
 429                 return;
 430
 431         state->proto_event = interface_proto_cb;
 432         state->iface = iface;
 433 }
 434
 435 void
 436 interface_init(struct interface *iface, const char *name,
 437                struct blob_attr *config)
 438 {
 439         struct blob_attr *tb[IFACE_ATTR_MAX];
 440         struct blob_attr *cur;
 441         const char *proto_name = NULL;
 442
 443         strncpy(iface->name, name, sizeof(iface->name) - 1);
 444         INIT_LIST_HEAD(&iface->errors);
 445         INIT_LIST_HEAD(&iface->users);
 446         INIT_LIST_HEAD(&iface->hotplug_list);
 447         interface_ip_init(iface);
 448         avl_init(&iface->data, avl_strcmp, false, NULL);
 449         iface->config_ip.enabled = false;
 450
 451         iface->main_dev.cb = interface_cb;
 452
 453         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 454                       blob_data(config), blob_len(config));
 455
 456         if ((cur = tb[IFACE_ATTR_PROTO]))
 457                 proto_name = blobmsg_data(cur);
 458
 459         proto_attach_interface(iface, proto_name);
 460
 461         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 462         iface->proto_ip.no_defaultroute =
 463                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 464         iface->proto_ip.no_dns =
 465                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 466
 467         if ((cur = tb[IFACE_ATTR_DNS]))
 468                 interface_add_dns_server_list(&iface->config_ip, cur);
 469
 470         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 471                 interface_add_dns_search_list(&iface->config_ip, cur);
 472
 473         if ((cur = tb[IFACE_ATTR_METRIC]))
 474                 iface->metric = blobmsg_get_u32(cur);
 475
 476         iface->config_autostart = iface->autostart;
 477 }
 478
 479 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 480 {
 481         struct blob_attr *tb[IFACE_ATTR_MAX];
 482         struct blob_attr *cur;
 483
 484         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 485                       blob_data(config), blob_len(config));
 486
 487         if (alias) {
 488                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 489                         iface->parent_ifname = blobmsg_data(cur);
 490
 491                 if (!iface->parent_ifname)
 492                         return false;
 493         } else {
 494                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 495                         iface->ifname = blobmsg_data(cur);
 496         }
 497
 498
 499         iface->config = config;
 500         vlist_add(&interfaces, &iface->node, iface->name);
 501         return true;
 502 }
 503
 504 void
 505 interface_add(struct interface *iface, struct blob_attr *config)
 506 {
 507         __interface_add(iface, config, false);
 508 }
 509
 510 bool
 511 interface_add_alias(struct interface *iface, struct blob_attr *config)
 512 {
 513         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 514                 return false;
 515
 516         return __interface_add(iface, config, true);
 517 }
 518
 519 void
 520 interface_set_l3_dev(struct interface *iface, struct device *dev)
 521 {
 522         bool enabled = iface->config_ip.enabled;
 523         bool claimed = iface->l3_dev.claimed;
 524
 525         if (iface->l3_dev.dev == dev)
 526                 return;
 527
 528         interface_ip_set_enabled(&iface->config_ip, false);
 529         interface_ip_flush(&iface->proto_ip);
 530         device_add_user(&iface->l3_dev, dev);
 531
 532         if (dev) {
 533                 if (claimed)
 534                         device_claim(&iface->l3_dev);
 535                 interface_ip_set_enabled(&iface->config_ip, enabled);
 536         }
 537 }
 538
 539 void
 540 interface_set_main_dev(struct interface *iface, struct device *dev)
 541 {
 542         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 543         bool claimed = iface->l3_dev.claimed;
 544
 545         if (iface->main_dev.dev == dev)
 546                 return;
 547
 548         if (set_l3)
 549                 interface_set_l3_dev(iface, dev);
 550
 551         device_add_user(&iface->main_dev, dev);
 552         if (claimed)
 553                 device_claim(&iface->l3_dev);
 554
 555         if (!iface->l3_dev.dev)
 556                 interface_set_l3_dev(iface, dev);
 557 }
 558
 559 int
 560 interface_remove_link(struct interface *iface, struct device *dev)
 561 {
 562         struct device *mdev = iface->main_dev.dev;
 563
 564         if (mdev && mdev->hotplug_ops)
 565                 return mdev->hotplug_ops->del(mdev, dev);
 566
 567         if (!iface->main_dev.hotplug)
 568                 return UBUS_STATUS_INVALID_ARGUMENT;
 569
 570         if (dev != iface->main_dev.dev)
 571                 return UBUS_STATUS_INVALID_ARGUMENT;
 572
 573         device_remove_user(&iface->main_dev);
 574         return 0;
 575 }
 576
 577 int
 578 interface_add_link(struct interface *iface, struct device *dev)
 579 {
 580         struct device *mdev = iface->main_dev.dev;
 581
 582         if (mdev == dev)
 583                 return 0;
 584
 585         if (iface->main_dev.hotplug)
 586                 device_remove_user(&iface->main_dev);
 587
 588         if (mdev) {
 589                 if (mdev->hotplug_ops)
 590                         return mdev->hotplug_ops->add(mdev, dev);
 591                 else
 592                         return UBUS_STATUS_NOT_SUPPORTED;
 593         }
 594
 595         interface_set_main_dev(iface, dev);
 596         iface->main_dev.hotplug = true;
 597         return 0;
 598 }
 599
 600 int
 601 interface_set_up(struct interface *iface)
 602 {
 603         int ret;
 604
 605         iface->autostart = true;
 606
 607         if (iface->state != IFS_DOWN)
 608                 return 0;
 609
 610         interface_clear_errors(iface);
 611         if (!iface->available) {
 612                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 613                 return -1;
 614         }
 615
 616         if (iface->main_dev.dev) {
 617                 ret = device_claim(&iface->main_dev);
 618                 if (ret)
 619                         return ret;
 620         }
 621
 622         iface->state = IFS_SETUP;
 623         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 624         if (ret) {
 625                 mark_interface_down(iface);
 626                 return ret;
 627         }
 628
 629         return 0;
 630 }
 631
 632 int
 633 interface_set_down(struct interface *iface)
 634 {
 635         if (!iface) {
 636                 vlist_for_each_element(&interfaces, iface, node)
 637                         __interface_set_down(iface, false);
 638         } else {
 639                 iface->autostart = false;
 640                 __interface_set_down(iface, false);
 641         }
 642
 643         return 0;
 644 }
 645
 646 void
 647 interface_start_pending(void)
 648 {
 649         struct interface *iface;
 650
 651         vlist_for_each_element(&interfaces, iface, node) {
 652                 if (iface->available && iface->autostart)
 653                         interface_set_up(iface);
 654         }
 655 }
 656
 657 static void
 658 set_config_state(struct interface *iface, enum interface_config_state s)
 659 {
 660         iface->config_state = s;
 661         if (iface->state == IFS_DOWN)
 662                 interface_handle_config_change(iface);
 663         else
 664                 __interface_set_down(iface, false);
 665 }
 666
 667 void
 668 interface_update_start(struct interface *iface)
 669 {
 670         interface_ip_update_start(&iface->proto_ip);
 671 }
 672
 673 void
 674 interface_update_complete(struct interface *iface)
 675 {
 676         interface_ip_update_complete(&iface->proto_ip);
 677 }
 678
 679 static void
 680 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 681 {
 682         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 683         vlist_simple_replace(&new->dns_search, &old->dns_search);
 684 }
 685
 686 static void
 687 interface_change_config(struct interface *if_old, struct interface *if_new)
 688 {
 689         struct blob_attr *old_config = if_old->config;
 690         const char *old_ifname = if_old->ifname;
 691         const char *old_parent_ifname = if_old->parent_ifname;
 692         const struct proto_handler *proto = if_old->proto_handler;
 693
 694         interface_clear_errors(if_old);
 695         if_old->config = if_new->config;
 696         if (!if_old->config_autostart && if_new->config_autostart)
 697                 if_old->autostart = true;
 698
 699         if_old->config_autostart = if_new->config_autostart;
 700         if_old->ifname = if_new->ifname;
 701         if_old->parent_ifname = if_new->parent_ifname;
 702         if_old->proto_handler = if_new->proto_handler;
 703
 704 #define FIELD_CHANGED_STR(field)                                        \
 705                 ((!!if_old->field != !!old_ ## field) ||                \
 706                  (old_ ## field &&                                      \
 707                   strcmp(old_ ## field, if_old->field) != 0))
 708
 709         if (FIELD_CHANGED_STR(parent_ifname)) {
 710                 if (if_old->parent_iface.iface)
 711                         interface_remove_user(&if_old->parent_iface);
 712                 goto reload;
 713         }
 714
 715         if (FIELD_CHANGED_STR(ifname) || proto != if_new->proto_handler) {
 716                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 717                   if_old->name);
 718                 goto reload;
 719         }
 720
 721         if (!proto->config_params)
 722                 D(INTERFACE, "No config parameters for interface '%s'\n",
 723                   if_old->name);
 724         else if (!config_check_equal(old_config, if_new->config,
 725                                 proto->config_params)) {
 726                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 727                   if_old->name);
 728                 goto reload;
 729         }
 730
 731 #define UPDATE(field) ({                                                \
 732                 bool __changed = (if_old->field != if_new->field);      \
 733                 if_old->field = if_new->field;                          \
 734                 __changed;                                              \
 735         })
 736
 737         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 738                 interface_ip_set_enabled(&if_old->config_ip, false);
 739                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 740                 interface_ip_set_enabled(&if_old->proto_ip, false);
 741                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 742         }
 743
 744         UPDATE(proto_ip.no_dns);
 745         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 746         interface_write_resolv_conf();
 747
 748 #undef UPDATE
 749
 750         goto out;
 751
 752 reload:
 753         set_config_state(if_old, IFC_RELOAD);
 754 out:
 755         if_new->config = NULL;
 756         interface_cleanup(if_new, false);
 757         free(old_config);
 758         free(if_new);
 759 }
 760
 761 static void
 762 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 763                  struct vlist_node *node_old)
 764 {
 765         struct interface *if_old = container_of(node_old, struct interface, node);
 766         struct interface *if_new = container_of(node_new, struct interface, node);
 767
 768         if (node_old && node_new) {
 769                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 770                 interface_change_config(if_old, if_new);
 771         } else if (node_old) {
 772                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 773                 set_config_state(if_old, IFC_REMOVE);
 774         } else if (node_new) {
 775                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 776                 proto_init_interface(if_new, if_new->config);
 777                 interface_claim_device(if_new);
 778                 netifd_ubus_add_interface(if_new);
 779         }
 780 }
 781
 782
 783 static void __init
 784 interface_init_list(void)
 785 {
 786         vlist_init(&interfaces, avl_strcmp, interface_update);
 787         interfaces.keep_old = true;
 788         interfaces.no_delete = true;
 789 }