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