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_flush_state(iface);
 332         interface_clear_errors(iface);
 333         interface_set_proto_state(iface, NULL);
 334 }
 335
 336 static void
 337 interface_cleanup(struct interface *iface)
 338 {
 339         struct interface_user *dep, *tmp;
 340
 341         if (iface->parent_iface.iface)
 342                 interface_remove_user(&iface->parent_iface);
 343
 344         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 345                 interface_remove_user(dep);
 346
 347         interface_ip_flush(&iface->config_ip);
 348         if (iface->main_dev.dev)
 349                 interface_set_main_dev(iface, NULL);
 350
 351         interface_cleanup_state(iface);
 352 }
 353
 354 static void
 355 interface_do_free(struct interface *iface)
 356 {
 357         interface_event(iface, IFEV_FREE);
 358         interface_cleanup(iface);
 359         free(iface->config);
 360         netifd_ubus_remove_interface(iface);
 361         avl_delete(&interfaces.avl, &iface->node.avl);
 362         free(iface);
 363 }
 364
 365 static void
 366 interface_do_reload(struct interface *iface)
 367 {
 368         interface_event(iface, IFEV_RELOAD);
 369         interface_cleanup_state(iface);
 370         proto_init_interface(iface, iface->config);
 371         interface_claim_device(iface);
 372 }
 373
 374 static void
 375 interface_handle_config_change(struct interface *iface)
 376 {
 377         enum interface_config_state state = iface->config_state;
 378
 379         iface->config_state = IFC_NORMAL;
 380         switch(state) {
 381         case IFC_NORMAL:
 382                 break;
 383         case IFC_RELOAD:
 384                 interface_do_reload(iface);
 385                 break;
 386         case IFC_REMOVE:
 387                 interface_do_free(iface);
 388                 return;
 389         }
 390         if (iface->autostart && iface->available)
 391                 interface_set_up(iface);
 392 }
 393
 394 static void
 395 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 396 {
 397         struct interface *iface = state->iface;
 398
 399         switch (ev) {
 400         case IFPEV_UP:
 401                 if (iface->state != IFS_SETUP)
 402                         return;
 403
 404                 interface_ip_set_enabled(&iface->config_ip, true);
 405                 system_flush_routes();
 406                 iface->state = IFS_UP;
 407                 iface->start_time = system_get_rtime();
 408                 interface_event(iface, IFEV_UP);
 409                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 410                 break;
 411         case IFPEV_DOWN:
 412                 if (iface->state == IFS_DOWN)
 413                         return;
 414
 415                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 416                 mark_interface_down(iface);
 417                 if (iface->main_dev.dev)
 418                         device_release(&iface->main_dev);
 419                 interface_handle_config_change(iface);
 420                 break;
 421         case IFPEV_LINK_LOST:
 422                 if (iface->state != IFS_UP)
 423                         return;
 424
 425                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 426                 mark_interface_down(iface);
 427                 iface->state = IFS_SETUP;
 428                 break;
 429         }
 430
 431         interface_write_resolv_conf();
 432 }
 433
 434 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 435 {
 436         if (iface->proto) {
 437                 iface->proto->free(iface->proto);
 438                 iface->proto = NULL;
 439         }
 440         iface->state = IFS_DOWN;
 441         iface->proto = state;
 442         if (!state)
 443                 return;
 444
 445         state->proto_event = interface_proto_cb;
 446         state->iface = iface;
 447 }
 448
 449 void
 450 interface_init(struct interface *iface, const char *name,
 451                struct blob_attr *config)
 452 {
 453         struct blob_attr *tb[IFACE_ATTR_MAX];
 454         struct blob_attr *cur;
 455         const char *proto_name = NULL;
 456
 457         strncpy(iface->name, name, sizeof(iface->name) - 1);
 458         INIT_LIST_HEAD(&iface->errors);
 459         INIT_LIST_HEAD(&iface->users);
 460         INIT_LIST_HEAD(&iface->hotplug_list);
 461         interface_ip_init(iface);
 462         avl_init(&iface->data, avl_strcmp, false, NULL);
 463         iface->config_ip.enabled = false;
 464
 465         iface->main_dev.cb = interface_cb;
 466
 467         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 468                       blob_data(config), blob_len(config));
 469
 470         if ((cur = tb[IFACE_ATTR_PROTO]))
 471                 proto_name = blobmsg_data(cur);
 472
 473         proto_attach_interface(iface, proto_name);
 474
 475         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 476         iface->proto_ip.no_defaultroute =
 477                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 478         iface->proto_ip.no_dns =
 479                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 480
 481         if ((cur = tb[IFACE_ATTR_DNS]))
 482                 interface_add_dns_server_list(&iface->config_ip, cur);
 483
 484         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 485                 interface_add_dns_search_list(&iface->config_ip, cur);
 486
 487         if ((cur = tb[IFACE_ATTR_METRIC]))
 488                 iface->metric = blobmsg_get_u32(cur);
 489
 490         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 491                 iface->config_ip.assignment_length = blobmsg_get_u32(cur);
 492
 493         iface->config_ip.assignment_hint = -1;
 494         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 495                 iface->config_ip.assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 496                                 ~((1 << (64 - iface->config_ip.assignment_length)) - 1);
 497
 498         iface->config_autostart = iface->autostart;
 499 }
 500
 501 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 502 {
 503         struct blob_attr *tb[IFACE_ATTR_MAX];
 504         struct blob_attr *cur;
 505
 506         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 507                       blob_data(config), blob_len(config));
 508
 509         if (alias) {
 510                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 511                         iface->parent_ifname = blobmsg_data(cur);
 512
 513                 if (!iface->parent_ifname)
 514                         return false;
 515         } else {
 516                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 517                         iface->ifname = blobmsg_data(cur);
 518         }
 519
 520
 521         iface->config = config;
 522         vlist_add(&interfaces, &iface->node, iface->name);
 523         return true;
 524 }
 525
 526 void
 527 interface_add(struct interface *iface, struct blob_attr *config)
 528 {
 529         __interface_add(iface, config, false);
 530 }
 531
 532 bool
 533 interface_add_alias(struct interface *iface, struct blob_attr *config)
 534 {
 535         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 536                 return false;
 537
 538         return __interface_add(iface, config, true);
 539 }
 540
 541 void
 542 interface_set_l3_dev(struct interface *iface, struct device *dev)
 543 {
 544         bool enabled = iface->config_ip.enabled;
 545         bool claimed = iface->l3_dev.claimed;
 546
 547         if (iface->l3_dev.dev == dev)
 548                 return;
 549
 550         interface_ip_set_enabled(&iface->config_ip, false);
 551         interface_ip_flush(&iface->proto_ip);
 552         device_add_user(&iface->l3_dev, dev);
 553
 554         if (dev) {
 555                 if (claimed)
 556                         device_claim(&iface->l3_dev);
 557                 interface_ip_set_enabled(&iface->config_ip, enabled);
 558         }
 559 }
 560
 561 void
 562 interface_set_main_dev(struct interface *iface, struct device *dev)
 563 {
 564         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 565         bool claimed = iface->l3_dev.claimed;
 566
 567         if (iface->main_dev.dev == dev)
 568                 return;
 569
 570         if (set_l3)
 571                 interface_set_l3_dev(iface, dev);
 572
 573         device_add_user(&iface->main_dev, dev);
 574         if (claimed)
 575                 device_claim(&iface->l3_dev);
 576
 577         if (!iface->l3_dev.dev)
 578                 interface_set_l3_dev(iface, dev);
 579 }
 580
 581 int
 582 interface_remove_link(struct interface *iface, struct device *dev)
 583 {
 584         struct device *mdev = iface->main_dev.dev;
 585
 586         if (mdev && mdev->hotplug_ops)
 587                 return mdev->hotplug_ops->del(mdev, dev);
 588
 589         if (!iface->main_dev.hotplug)
 590                 return UBUS_STATUS_INVALID_ARGUMENT;
 591
 592         if (dev != iface->main_dev.dev)
 593                 return UBUS_STATUS_INVALID_ARGUMENT;
 594
 595         device_remove_user(&iface->main_dev);
 596         return 0;
 597 }
 598
 599 int
 600 interface_add_link(struct interface *iface, struct device *dev)
 601 {
 602         struct device *mdev = iface->main_dev.dev;
 603
 604         if (mdev == dev)
 605                 return 0;
 606
 607         if (iface->main_dev.hotplug)
 608                 device_remove_user(&iface->main_dev);
 609
 610         if (mdev) {
 611                 if (mdev->hotplug_ops)
 612                         return mdev->hotplug_ops->add(mdev, dev);
 613                 else
 614                         return UBUS_STATUS_NOT_SUPPORTED;
 615         }
 616
 617         interface_set_main_dev(iface, dev);
 618         iface->main_dev.hotplug = true;
 619         return 0;
 620 }
 621
 622 int
 623 interface_set_up(struct interface *iface)
 624 {
 625         int ret;
 626
 627         iface->autostart = true;
 628
 629         if (iface->state != IFS_DOWN)
 630                 return 0;
 631
 632         interface_clear_errors(iface);
 633         if (!iface->available) {
 634                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 635                 return -1;
 636         }
 637
 638         if (iface->main_dev.dev) {
 639                 ret = device_claim(&iface->main_dev);
 640                 if (ret)
 641                         return ret;
 642         }
 643
 644         iface->state = IFS_SETUP;
 645         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 646         if (ret) {
 647                 mark_interface_down(iface);
 648                 return ret;
 649         }
 650
 651         return 0;
 652 }
 653
 654 int
 655 interface_set_down(struct interface *iface)
 656 {
 657         if (!iface) {
 658                 vlist_for_each_element(&interfaces, iface, node)
 659                         __interface_set_down(iface, false);
 660         } else {
 661                 iface->autostart = false;
 662                 __interface_set_down(iface, false);
 663         }
 664
 665         return 0;
 666 }
 667
 668 void
 669 interface_start_pending(void)
 670 {
 671         struct interface *iface;
 672
 673         vlist_for_each_element(&interfaces, iface, node) {
 674                 if (iface->available && iface->autostart)
 675                         interface_set_up(iface);
 676         }
 677 }
 678
 679 static void
 680 set_config_state(struct interface *iface, enum interface_config_state s)
 681 {
 682         iface->config_state = s;
 683         if (iface->state == IFS_DOWN)
 684                 interface_handle_config_change(iface);
 685         else
 686                 __interface_set_down(iface, false);
 687 }
 688
 689 void
 690 interface_update_start(struct interface *iface)
 691 {
 692         interface_ip_update_start(&iface->proto_ip);
 693 }
 694
 695 void
 696 interface_update_complete(struct interface *iface)
 697 {
 698         interface_ip_update_complete(&iface->proto_ip);
 699 }
 700
 701 static void
 702 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 703 {
 704         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 705         vlist_simple_replace(&new->dns_search, &old->dns_search);
 706 }
 707
 708 static void
 709 interface_change_config(struct interface *if_old, struct interface *if_new)
 710 {
 711         struct blob_attr *old_config = if_old->config;
 712         const char *old_ifname = if_old->ifname;
 713         const char *old_parent_ifname = if_old->parent_ifname;
 714         const struct proto_handler *proto = if_old->proto_handler;
 715
 716         interface_clear_errors(if_old);
 717         if_old->config = if_new->config;
 718         if (!if_old->config_autostart && if_new->config_autostart)
 719                 if_old->autostart = true;
 720
 721         if_old->device_config = if_new->device_config;
 722         if_old->config_autostart = if_new->config_autostart;
 723         if_old->ifname = if_new->ifname;
 724         if_old->parent_ifname = if_new->parent_ifname;
 725         if_old->proto_handler = if_new->proto_handler;
 726
 727         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 728         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 729
 730 #define FIELD_CHANGED_STR(field)                                        \
 731                 ((!!if_old->field != !!old_ ## field) ||                \
 732                  (old_ ## field &&                                      \
 733                   strcmp(old_ ## field, if_old->field) != 0))
 734
 735         if (FIELD_CHANGED_STR(parent_ifname)) {
 736                 if (if_old->parent_iface.iface)
 737                         interface_remove_user(&if_old->parent_iface);
 738                 goto reload;
 739         }
 740
 741         if (FIELD_CHANGED_STR(ifname) || proto != if_new->proto_handler) {
 742                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 743                   if_old->name);
 744                 goto reload;
 745         }
 746
 747         if (!proto->config_params)
 748                 D(INTERFACE, "No config parameters for interface '%s'\n",
 749                   if_old->name);
 750         else if (!config_check_equal(old_config, if_new->config,
 751                                 proto->config_params)) {
 752                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 753                   if_old->name);
 754                 goto reload;
 755         }
 756
 757 #define UPDATE(field) ({                                                \
 758                 bool __changed = (if_old->field != if_new->field);      \
 759                 if_old->field = if_new->field;                          \
 760                 __changed;                                              \
 761         })
 762
 763         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 764                 interface_ip_set_enabled(&if_old->config_ip, false);
 765                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 766                 interface_ip_set_enabled(&if_old->proto_ip, false);
 767                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 768         }
 769
 770         if (UPDATE(config_ip.assignment_length) || UPDATE(config_ip.assignment_hint))
 771                 interface_refresh_assignments(true);
 772
 773         interface_write_resolv_conf();
 774
 775 #undef UPDATE
 776
 777         goto out;
 778
 779 reload:
 780         set_config_state(if_old, IFC_RELOAD);
 781 out:
 782         if_new->config = NULL;
 783         interface_cleanup(if_new);
 784         free(old_config);
 785         free(if_new);
 786 }
 787
 788 static void
 789 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 790                  struct vlist_node *node_old)
 791 {
 792         struct interface *if_old = container_of(node_old, struct interface, node);
 793         struct interface *if_new = container_of(node_new, struct interface, node);
 794
 795         if (node_old && node_new) {
 796                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 797                 interface_change_config(if_old, if_new);
 798         } else if (node_old) {
 799                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 800                 set_config_state(if_old, IFC_REMOVE);
 801         } else if (node_new) {
 802                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 803                 proto_init_interface(if_new, if_new->config);
 804                 interface_claim_device(if_new);
 805                 netifd_ubus_add_interface(if_new);
 806         }
 807 }
 808
 809
 810 static void __init
 811 interface_init_list(void)
 812 {
 813         vlist_init(&interfaces, avl_strcmp, interface_update);
 814         interfaces.keep_old = true;
 815         interfaces.no_delete = true;
 816 }