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_MAX
  43 };
  44
  45 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  46         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  47         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  48         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  49         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  50         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  51         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  52         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  53         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  54         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  55         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  57 };
  58
  59 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  60         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  61 };
  62
  63 const struct config_param_list interface_attr_list = {
  64         .n_params = IFACE_ATTR_MAX,
  65         .params = iface_attrs,
  66         .info = iface_attr_info,
  67 };
  68
  69 static void
  70 interface_clear_errors(struct interface *iface)
  71 {
  72         struct interface_error *error, *tmp;
  73
  74         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  75                 list_del(&error->list);
  76                 free(error);
  77         }
  78 }
  79
  80 void interface_add_error(struct interface *iface, const char *subsystem,
  81                          const char *code, const char **data, int n_data)
  82 {
  83         struct interface_error *error;
  84         int i, len = 0;
  85         int *datalen = NULL;
  86         char *dest, *d_subsys, *d_code;
  87
  88         if (n_data) {
  89                 len = n_data * sizeof(char *);
  90                 datalen = alloca(len);
  91                 for (i = 0; i < n_data; i++) {
  92                         datalen[i] = strlen(data[i]) + 1;
  93                         len += datalen[i];
  94                 }
  95         }
  96
  97         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
  98                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
  99                 &d_code, code ? strlen(code) + 1 : 0);
 100         if (!error)
 101                 return;
 102
 103         list_add_tail(&error->list, &iface->errors);
 104
 105         dest = (char *) &error->data[n_data + 1];
 106         for (i = 0; i < n_data; i++) {
 107                 error->data[i] = dest;
 108                 memcpy(dest, data[i], datalen[i]);
 109                 dest += datalen[i];
 110         }
 111         error->data[n_data++] = NULL;
 112
 113         if (subsystem)
 114                 error->subsystem = strcpy(d_subsys, subsystem);
 115
 116         if (code)
 117                 error->code = strcpy(d_code, code);
 118 }
 119
 120 static void
 121 interface_data_del(struct interface *iface, struct interface_data *data)
 122 {
 123         avl_delete(&iface->data, &data->node);
 124         free(data);
 125 }
 126
 127 static void
 128 interface_data_flush(struct interface *iface)
 129 {
 130         struct interface_data *d, *tmp;
 131
 132         avl_for_each_element_safe(&iface->data, d, node, tmp)
 133                 interface_data_del(iface, d);
 134 }
 135
 136 int
 137 interface_add_data(struct interface *iface, const struct blob_attr *data)
 138 {
 139         struct interface_data *n, *o;
 140
 141         if (!blobmsg_check_attr(data, true))
 142                 return UBUS_STATUS_INVALID_ARGUMENT;
 143
 144         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 145         memcpy(n->data, data, blob_pad_len(data));
 146         n->node.key = blobmsg_name(data);
 147
 148         o = avl_find_element(&iface->data, n->node.key, o, node);
 149         if (o)
 150                 interface_data_del(iface, o);
 151
 152         avl_insert(&iface->data, &n->node);
 153         return 0;
 154 }
 155
 156 static void
 157 interface_event(struct interface *iface, enum interface_event ev)
 158 {
 159         struct interface_user *dep, *tmp;
 160         struct device *adev = NULL;
 161
 162         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 163                 dep->cb(dep, iface, ev);
 164
 165         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 166                 dep->cb(dep, iface, ev);
 167
 168         switch (ev) {
 169         case IFEV_UP:
 170                 adev = iface->l3_dev.dev;
 171                 /* fall through */
 172         case IFEV_DOWN:
 173                 alias_notify_device(iface->name, adev);
 174                 break;
 175         default:
 176                 break;
 177         }
 178 }
 179
 180 static void
 181 interface_flush_state(struct interface *iface)
 182 {
 183         if (iface->l3_dev.dev)
 184                 device_release(&iface->l3_dev);
 185         interface_data_flush(iface);
 186 }
 187
 188 static void
 189 mark_interface_down(struct interface *iface)
 190 {
 191         enum interface_state state = iface->state;
 192
 193         iface->state = IFS_DOWN;
 194         if (state == IFS_UP)
 195                 interface_event(iface, IFEV_DOWN);
 196         interface_ip_set_enabled(&iface->config_ip, false);
 197         interface_ip_flush(&iface->proto_ip);
 198         interface_flush_state(iface);
 199         system_flush_routes();
 200 }
 201
 202 void
 203 __interface_set_down(struct interface *iface, bool force)
 204 {
 205         if (iface->state == IFS_DOWN ||
 206                 iface->state == IFS_TEARDOWN)
 207                 return;
 208
 209         if (iface->state == IFS_UP)
 210                 interface_event(iface, IFEV_DOWN);
 211         iface->state = IFS_TEARDOWN;
 212         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 213         if (force)
 214                 interface_flush_state(iface);
 215 }
 216
 217 static void
 218 interface_cb(struct device_user *dep, enum device_event ev)
 219 {
 220         struct interface *iface;
 221         bool new_state;
 222
 223         iface = container_of(dep, struct interface, main_dev);
 224         switch (ev) {
 225         case DEV_EVENT_ADD:
 226                 new_state = true;
 227                 break;
 228         case DEV_EVENT_REMOVE:
 229                 new_state = false;
 230                 break;
 231         default:
 232                 return;
 233         }
 234
 235         interface_set_available(iface, new_state);
 236         if (!new_state && dep->dev->external)
 237                 interface_set_main_dev(iface, NULL);
 238 }
 239
 240 void
 241 interface_set_available(struct interface *iface, bool new_state)
 242 {
 243         if (iface->available == new_state)
 244                 return;
 245
 246         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 247         iface->available = new_state;
 248
 249         if (new_state) {
 250                 if (iface->autostart && !config_init)
 251                         interface_set_up(iface);
 252         } else
 253                 __interface_set_down(iface, true);
 254 }
 255
 256 void
 257 interface_add_user(struct interface_user *dep, struct interface *iface)
 258 {
 259         if (!iface) {
 260                 list_add(&dep->list, &iface_all_users);
 261                 return;
 262         }
 263
 264         dep->iface = iface;
 265         list_add(&dep->list, &iface->users);
 266         if (iface->state == IFS_UP)
 267                 dep->cb(dep, iface, IFEV_UP);
 268 }
 269
 270 void
 271 interface_remove_user(struct interface_user *dep)
 272 {
 273         list_del_init(&dep->list);
 274         dep->iface = NULL;
 275 }
 276
 277 static void
 278 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 279 {
 280         struct interface *alias = container_of(dep, struct interface, parent_iface);
 281         struct device *dev = iface->l3_dev.dev;
 282
 283         switch (ev) {
 284         case IFEV_UP:
 285                 if (!dev)
 286                         return;
 287
 288                 interface_set_main_dev(alias, dev);
 289                 interface_set_available(alias, true);
 290                 break;
 291         case IFEV_DOWN:
 292                 interface_set_available(alias, false);
 293                 interface_set_main_dev(alias, NULL);
 294                 break;
 295         case IFEV_FREE:
 296                 interface_remove_user(dep);
 297                 break;
 298         case IFEV_RELOAD:
 299                 break;
 300         }
 301 }
 302
 303 static void
 304 interface_claim_device(struct interface *iface)
 305 {
 306         struct interface *parent;
 307         struct device *dev = NULL;
 308
 309         if (iface->parent_iface.iface)
 310                 interface_remove_user(&iface->parent_iface);
 311
 312         if (iface->parent_ifname) {
 313                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 314                 iface->parent_iface.cb = interface_alias_cb;
 315                 interface_add_user(&iface->parent_iface, parent);
 316         } else if (iface->ifname &&
 317                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 318                 dev = device_get(iface->ifname, true);
 319         }
 320
 321         if (dev)
 322                 interface_set_main_dev(iface, dev);
 323
 324         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 325                 interface_set_available(iface, true);
 326 }
 327
 328 static void
 329 interface_cleanup_state(struct interface *iface)
 330 {
 331         interface_set_available(iface, false);
 332
 333         interface_flush_state(iface);
 334         interface_clear_errors(iface);
 335         interface_set_proto_state(iface, NULL);
 336
 337         if (iface->main_dev.dev)
 338                 interface_set_main_dev(iface, NULL);
 339 }
 340
 341 static void
 342 interface_cleanup(struct interface *iface)
 343 {
 344         struct interface_user *dep, *tmp;
 345
 346         if (iface->parent_iface.iface)
 347                 interface_remove_user(&iface->parent_iface);
 348
 349         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 350                 interface_remove_user(dep);
 351
 352         interface_ip_flush(&iface->config_ip);
 353         interface_cleanup_state(iface);
 354 }
 355
 356 static void
 357 interface_do_free(struct interface *iface)
 358 {
 359         interface_event(iface, IFEV_FREE);
 360         interface_cleanup(iface);
 361         free(iface->config);
 362         netifd_ubus_remove_interface(iface);
 363         avl_delete(&interfaces.avl, &iface->node.avl);
 364         free(iface);
 365 }
 366
 367 static void
 368 interface_do_reload(struct interface *iface)
 369 {
 370         interface_event(iface, IFEV_RELOAD);
 371         interface_cleanup_state(iface);
 372         proto_init_interface(iface, iface->config);
 373         interface_claim_device(iface);
 374 }
 375
 376 static void
 377 interface_handle_config_change(struct interface *iface)
 378 {
 379         enum interface_config_state state = iface->config_state;
 380
 381         iface->config_state = IFC_NORMAL;
 382         switch(state) {
 383         case IFC_NORMAL:
 384                 break;
 385         case IFC_RELOAD:
 386                 interface_do_reload(iface);
 387                 break;
 388         case IFC_REMOVE:
 389                 interface_do_free(iface);
 390                 return;
 391         }
 392         if (iface->autostart && iface->available)
 393                 interface_set_up(iface);
 394 }
 395
 396 static void
 397 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 398 {
 399         struct interface *iface = state->iface;
 400
 401         switch (ev) {
 402         case IFPEV_UP:
 403                 if (iface->state != IFS_SETUP)
 404                         return;
 405
 406                 interface_ip_set_enabled(&iface->config_ip, true);
 407                 system_flush_routes();
 408                 iface->state = IFS_UP;
 409                 iface->start_time = system_get_rtime();
 410                 interface_event(iface, IFEV_UP);
 411                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 412                 break;
 413         case IFPEV_DOWN:
 414                 if (iface->state == IFS_DOWN)
 415                         return;
 416
 417                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 418                 mark_interface_down(iface);
 419                 if (iface->main_dev.dev)
 420                         device_release(&iface->main_dev);
 421                 interface_handle_config_change(iface);
 422                 break;
 423         case IFPEV_LINK_LOST:
 424                 if (iface->state != IFS_UP)
 425                         return;
 426
 427                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 428                 mark_interface_down(iface);
 429                 iface->state = IFS_SETUP;
 430                 break;
 431         }
 432
 433         interface_write_resolv_conf();
 434 }
 435
 436 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 437 {
 438         if (iface->proto) {
 439                 iface->proto->free(iface->proto);
 440                 iface->proto = NULL;
 441         }
 442         iface->state = IFS_DOWN;
 443         iface->proto = state;
 444         if (!state)
 445                 return;
 446
 447         state->proto_event = interface_proto_cb;
 448         state->iface = iface;
 449 }
 450
 451 void
 452 interface_init(struct interface *iface, const char *name,
 453                struct blob_attr *config)
 454 {
 455         struct blob_attr *tb[IFACE_ATTR_MAX];
 456         struct blob_attr *cur;
 457         const char *proto_name = NULL;
 458
 459         strncpy(iface->name, name, sizeof(iface->name) - 1);
 460         INIT_LIST_HEAD(&iface->errors);
 461         INIT_LIST_HEAD(&iface->users);
 462         INIT_LIST_HEAD(&iface->hotplug_list);
 463         interface_ip_init(iface);
 464         avl_init(&iface->data, avl_strcmp, false, NULL);
 465         iface->config_ip.enabled = false;
 466
 467         iface->main_dev.cb = interface_cb;
 468
 469         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 470                       blob_data(config), blob_len(config));
 471
 472         if ((cur = tb[IFACE_ATTR_PROTO]))
 473                 proto_name = blobmsg_data(cur);
 474
 475         proto_attach_interface(iface, proto_name);
 476
 477         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 478         iface->proto_ip.no_defaultroute =
 479                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 480         iface->proto_ip.no_dns =
 481                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 482
 483         if ((cur = tb[IFACE_ATTR_DNS]))
 484                 interface_add_dns_server_list(&iface->config_ip, cur);
 485
 486         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 487                 interface_add_dns_search_list(&iface->config_ip, cur);
 488
 489         if ((cur = tb[IFACE_ATTR_METRIC]))
 490                 iface->metric = blobmsg_get_u32(cur);
 491
 492         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 493                 iface->config_ip.assignment_length = blobmsg_get_u32(cur);
 494
 495         iface->config_ip.assignment_hint = -1;
 496         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 497                 iface->config_ip.assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 498                                 ~((1 << (64 - iface->config_ip.assignment_length)) - 1);
 499
 500         iface->config_autostart = iface->autostart;
 501 }
 502
 503 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 504 {
 505         struct blob_attr *tb[IFACE_ATTR_MAX];
 506         struct blob_attr *cur;
 507
 508         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 509                       blob_data(config), blob_len(config));
 510
 511         if (alias) {
 512                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 513                         iface->parent_ifname = blobmsg_data(cur);
 514
 515                 if (!iface->parent_ifname)
 516                         return false;
 517         } else {
 518                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 519                         iface->ifname = blobmsg_data(cur);
 520         }
 521
 522
 523         iface->config = config;
 524         vlist_add(&interfaces, &iface->node, iface->name);
 525         return true;
 526 }
 527
 528 void
 529 interface_add(struct interface *iface, struct blob_attr *config)
 530 {
 531         __interface_add(iface, config, false);
 532 }
 533
 534 bool
 535 interface_add_alias(struct interface *iface, struct blob_attr *config)
 536 {
 537         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 538                 return false;
 539
 540         return __interface_add(iface, config, true);
 541 }
 542
 543 void
 544 interface_set_l3_dev(struct interface *iface, struct device *dev)
 545 {
 546         bool enabled = iface->config_ip.enabled;
 547         bool claimed = iface->l3_dev.claimed;
 548
 549         if (iface->l3_dev.dev == dev)
 550                 return;
 551
 552         interface_ip_set_enabled(&iface->config_ip, false);
 553         interface_ip_flush(&iface->proto_ip);
 554         device_add_user(&iface->l3_dev, dev);
 555
 556         if (dev) {
 557                 if (claimed)
 558                         device_claim(&iface->l3_dev);
 559                 interface_ip_set_enabled(&iface->config_ip, enabled);
 560         }
 561 }
 562
 563 void
 564 interface_set_main_dev(struct interface *iface, struct device *dev)
 565 {
 566         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 567         bool claimed = iface->l3_dev.claimed;
 568
 569         if (iface->main_dev.dev == dev)
 570                 return;
 571
 572         if (set_l3)
 573                 interface_set_l3_dev(iface, dev);
 574
 575         device_add_user(&iface->main_dev, dev);
 576         if (claimed)
 577                 device_claim(&iface->l3_dev);
 578
 579         if (!iface->l3_dev.dev)
 580                 interface_set_l3_dev(iface, dev);
 581 }
 582
 583 int
 584 interface_remove_link(struct interface *iface, struct device *dev)
 585 {
 586         struct device *mdev = iface->main_dev.dev;
 587
 588         if (mdev && mdev->hotplug_ops)
 589                 return mdev->hotplug_ops->del(mdev, dev);
 590
 591         if (!iface->main_dev.hotplug)
 592                 return UBUS_STATUS_INVALID_ARGUMENT;
 593
 594         if (dev != iface->main_dev.dev)
 595                 return UBUS_STATUS_INVALID_ARGUMENT;
 596
 597         device_remove_user(&iface->main_dev);
 598         return 0;
 599 }
 600
 601 int
 602 interface_add_link(struct interface *iface, struct device *dev)
 603 {
 604         struct device *mdev = iface->main_dev.dev;
 605
 606         if (mdev == dev)
 607                 return 0;
 608
 609         if (iface->main_dev.hotplug)
 610                 device_remove_user(&iface->main_dev);
 611
 612         if (mdev) {
 613                 if (mdev->hotplug_ops)
 614                         return mdev->hotplug_ops->add(mdev, dev);
 615                 else
 616                         return UBUS_STATUS_NOT_SUPPORTED;
 617         }
 618
 619         interface_set_main_dev(iface, dev);
 620         iface->main_dev.hotplug = true;
 621         return 0;
 622 }
 623
 624 int
 625 interface_set_up(struct interface *iface)
 626 {
 627         int ret;
 628
 629         iface->autostart = true;
 630
 631         if (iface->state != IFS_DOWN)
 632                 return 0;
 633
 634         interface_clear_errors(iface);
 635         if (!iface->available) {
 636                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 637                 return -1;
 638         }
 639
 640         if (iface->main_dev.dev) {
 641                 ret = device_claim(&iface->main_dev);
 642                 if (ret)
 643                         return ret;
 644         }
 645
 646         iface->state = IFS_SETUP;
 647         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 648         if (ret) {
 649                 mark_interface_down(iface);
 650                 return ret;
 651         }
 652
 653         return 0;
 654 }
 655
 656 int
 657 interface_set_down(struct interface *iface)
 658 {
 659         if (!iface) {
 660                 vlist_for_each_element(&interfaces, iface, node)
 661                         __interface_set_down(iface, false);
 662         } else {
 663                 iface->autostart = false;
 664                 __interface_set_down(iface, false);
 665         }
 666
 667         return 0;
 668 }
 669
 670 void
 671 interface_start_pending(void)
 672 {
 673         struct interface *iface;
 674
 675         vlist_for_each_element(&interfaces, iface, node) {
 676                 if (iface->available && iface->autostart)
 677                         interface_set_up(iface);
 678         }
 679 }
 680
 681 static void
 682 set_config_state(struct interface *iface, enum interface_config_state s)
 683 {
 684         iface->config_state = s;
 685         if (iface->state == IFS_DOWN)
 686                 interface_handle_config_change(iface);
 687         else
 688                 __interface_set_down(iface, false);
 689 }
 690
 691 void
 692 interface_update_start(struct interface *iface)
 693 {
 694         interface_ip_update_start(&iface->proto_ip);
 695 }
 696
 697 void
 698 interface_update_complete(struct interface *iface)
 699 {
 700         interface_ip_update_complete(&iface->proto_ip);
 701 }
 702
 703 static void
 704 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 705 {
 706         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 707         vlist_simple_replace(&new->dns_search, &old->dns_search);
 708 }
 709
 710 static void
 711 interface_change_config(struct interface *if_old, struct interface *if_new)
 712 {
 713         struct blob_attr *old_config = if_old->config;
 714         bool reload = false, reload_ip = false, reload_assignment = false;
 715
 716 #define FIELD_CHANGED_STR(field)                                        \
 717                 ((!!if_old->field != !!if_new->field) ||                \
 718                  (if_old->field &&                                      \
 719                   strcmp(if_old->field, if_new->field) != 0))
 720
 721         if (FIELD_CHANGED_STR(parent_ifname)) {
 722                 if (if_old->parent_iface.iface)
 723                         interface_remove_user(&if_old->parent_iface);
 724                 reload = true;
 725         }
 726
 727         if (FIELD_CHANGED_STR(ifname) ||
 728             if_old->proto_handler != if_new->proto_handler)
 729                 reload = true;
 730
 731         if (!if_old->proto_handler->config_params)
 732                 D(INTERFACE, "No config parameters for interface '%s'\n",
 733                   if_old->name);
 734         else if (!config_check_equal(if_old->config, if_new->config,
 735                                      if_old->proto_handler->config_params))
 736                 reload = true;
 737
 738 #define UPDATE(field, __var) ({                                         \
 739                 bool __changed = (if_old->field != if_new->field);      \
 740                 if_old->field = if_new->field;                          \
 741                 __var |= __changed;                                     \
 742         })
 743
 744         if_old->config = if_new->config;
 745         if (!if_old->config_autostart && if_new->config_autostart)
 746                 if_old->autostart = true;
 747
 748         if_old->device_config = if_new->device_config;
 749         if_old->config_autostart = if_new->config_autostart;
 750         if_old->ifname = if_new->ifname;
 751         if_old->parent_ifname = if_new->parent_ifname;
 752         if_old->proto_handler = if_new->proto_handler;
 753
 754         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 755         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 756
 757         UPDATE(metric, reload_ip);
 758         UPDATE(proto_ip.no_defaultroute, reload_ip);
 759         UPDATE(config_ip.assignment_length, reload_assignment);
 760         UPDATE(config_ip.assignment_hint, reload_assignment);
 761
 762 #undef UPDATE
 763
 764         if (reload) {
 765                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 766                   if_old->name);
 767                 interface_clear_errors(if_old);
 768                 set_config_state(if_old, IFC_RELOAD);
 769                 goto out;
 770         }
 771
 772         if (reload_ip) {
 773                 interface_ip_set_enabled(&if_old->config_ip, false);
 774                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 775                 interface_ip_set_enabled(&if_old->proto_ip, false);
 776                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 777         }
 778
 779         if (reload_assignment)
 780                 interface_refresh_assignments(true);
 781
 782         interface_write_resolv_conf();
 783
 784 out:
 785         if_new->config = NULL;
 786         interface_cleanup(if_new);
 787         free(old_config);
 788         free(if_new);
 789 }
 790
 791 static void
 792 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 793                  struct vlist_node *node_old)
 794 {
 795         struct interface *if_old = container_of(node_old, struct interface, node);
 796         struct interface *if_new = container_of(node_new, struct interface, node);
 797
 798         if (node_old && node_new) {
 799                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 800                 interface_change_config(if_old, if_new);
 801         } else if (node_old) {
 802                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 803                 set_config_state(if_old, IFC_REMOVE);
 804         } else if (node_new) {
 805                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 806                 proto_init_interface(if_new, if_new->config);
 807                 interface_claim_device(if_new);
 808                 netifd_ubus_add_interface(if_new);
 809         }
 810 }
 811
 812
 813 static void __init
 814 interface_init_list(void)
 815 {
 816         vlist_init(&interfaces, avl_strcmp, interface_update);
 817         interfaces.keep_old = true;
 818         interfaces.no_delete = true;
 819 }