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 #include <sys/types.h>
  18 #include <sys/wait.h>
  19
  20 #include "netifd.h"
  21 #include "device.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "proto.h"
  25 #include "ubus.h"
  26 #include "config.h"
  27 #include "system.h"
  28
  29 struct vlist_tree interfaces;
  30 static LIST_HEAD(iface_all_users);
  31
  32 enum {
  33         IFACE_ATTR_DEVICE,
  34         IFACE_ATTR_IFNAME, /* Backward compatibility */
  35         IFACE_ATTR_PROTO,
  36         IFACE_ATTR_AUTO,
  37         IFACE_ATTR_ZONE,
  38         IFACE_ATTR_JAIL,
  39         IFACE_ATTR_JAIL_DEVICE,
  40         IFACE_ATTR_JAIL_IFNAME,
  41         IFACE_ATTR_HOST_DEVICE,
  42         IFACE_ATTR_DEFAULTROUTE,
  43         IFACE_ATTR_PEERDNS,
  44         IFACE_ATTR_DNS,
  45         IFACE_ATTR_DNS_SEARCH,
  46         IFACE_ATTR_DNS_METRIC,
  47         IFACE_ATTR_METRIC,
  48         IFACE_ATTR_INTERFACE,
  49         IFACE_ATTR_IP6ASSIGN,
  50         IFACE_ATTR_IP6HINT,
  51         IFACE_ATTR_IP4TABLE,
  52         IFACE_ATTR_IP6TABLE,
  53         IFACE_ATTR_IP6CLASS,
  54         IFACE_ATTR_DELEGATE,
  55         IFACE_ATTR_IP6IFACEID,
  56         IFACE_ATTR_FORCE_LINK,
  57         IFACE_ATTR_IP6WEIGHT,
  58         IFACE_ATTR_MAX
  59 };
  60
  61 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  62         [IFACE_ATTR_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_ZONE] = { .name = "zone", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_JAIL_DEVICE] = { .name = "jail_device", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_JAIL_IFNAME] = { .name = "jail_ifname", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_HOST_DEVICE] = { .name = "host_device", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  74         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  75         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  76         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  79         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  84         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  86         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  87 };
  88
  89 const struct uci_blob_param_list interface_attr_list = {
  90         .n_params = IFACE_ATTR_MAX,
  91         .params = iface_attrs,
  92 };
  93
  94 static void
  95 interface_set_main_dev(struct interface *iface, struct device *dev);
  96 static void
  97 interface_event(struct interface *iface, enum interface_event ev);
  98
  99 static void
 100 interface_error_flush(struct interface *iface)
 101 {
 102         struct interface_error *error, *tmp;
 103
 104         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
 105                 list_del(&error->list);
 106                 free(error);
 107         }
 108 }
 109
 110 static bool
 111 interface_force_link(struct interface *iface)
 112 {
 113         struct device *dev = iface->main_dev.dev;
 114
 115         if (dev && dev->settings.auth)
 116                 return false;
 117
 118         return iface->force_link;
 119 }
 120
 121 static void
 122 interface_clear_errors(struct interface *iface)
 123 {
 124         /* don't flush the errors in case the configured protocol handler matches the
 125            running protocol handler and is having the last error capability */
 126         if (!(iface->proto &&
 127               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 128               (iface->proto->handler->name == iface->proto_handler->name)))
 129                 interface_error_flush(iface);
 130 }
 131
 132 void interface_add_error(struct interface *iface, const char *subsystem,
 133                          const char *code, const char **data, int n_data)
 134 {
 135         struct interface_error *error;
 136         int i, len = 0;
 137         int *datalen = NULL;
 138         char *dest, *d_subsys, *d_code;
 139
 140         /* if the configured protocol handler has the last error support capability,
 141            errors should only be added if the running protocol handler matches the
 142            configured one */
 143         if (iface->proto &&
 144             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 145             (iface->proto->handler->name != iface->proto_handler->name))
 146                 return;
 147
 148         if (n_data) {
 149                 len = n_data * sizeof(char *);
 150                 datalen = alloca(len);
 151                 for (i = 0; i < n_data; i++) {
 152                         datalen[i] = strlen(data[i]) + 1;
 153                         len += datalen[i];
 154                 }
 155         }
 156
 157         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 158                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 159                 &d_code, code ? strlen(code) + 1 : 0);
 160         if (!error)
 161                 return;
 162
 163         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 164            protocol can't be established (e.g auth failure) */
 165         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 166                 interface_error_flush(iface);
 167
 168         list_add_tail(&error->list, &iface->errors);
 169
 170         dest = (char *) &error->data[n_data + 1];
 171         for (i = 0; i < n_data; i++) {
 172                 error->data[i] = dest;
 173                 memcpy(dest, data[i], datalen[i]);
 174                 dest += datalen[i];
 175         }
 176         error->data[n_data] = NULL;
 177
 178         if (subsystem)
 179                 error->subsystem = strcpy(d_subsys, subsystem);
 180
 181         if (code)
 182                 error->code = strcpy(d_code, code);
 183 }
 184
 185 static void
 186 interface_data_del(struct interface *iface, struct interface_data *data)
 187 {
 188         avl_delete(&iface->data, &data->node);
 189         free(data);
 190 }
 191
 192 static void
 193 interface_data_flush(struct interface *iface)
 194 {
 195         struct interface_data *d, *tmp;
 196
 197         avl_for_each_element_safe(&iface->data, d, node, tmp)
 198                 interface_data_del(iface, d);
 199 }
 200
 201 int
 202 interface_add_data(struct interface *iface, const struct blob_attr *data)
 203 {
 204         struct interface_data *n, *o;
 205
 206         if (!blobmsg_check_attr(data, true))
 207                 return UBUS_STATUS_INVALID_ARGUMENT;
 208
 209         const char *name = blobmsg_name(data);
 210         unsigned len = blob_pad_len(data);
 211
 212         o = avl_find_element(&iface->data, name, o, node);
 213         if (o) {
 214                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 215                         return 0;
 216
 217                 interface_data_del(iface, o);
 218         }
 219
 220         n = calloc(1, sizeof(*n) + len);
 221         if (!n)
 222                 return UBUS_STATUS_UNKNOWN_ERROR;
 223
 224         memcpy(n->data, data, len);
 225         n->node.key = blobmsg_name(n->data);
 226         avl_insert(&iface->data, &n->node);
 227
 228         iface->updated |= IUF_DATA;
 229         return 0;
 230 }
 231
 232 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 233 {
 234         struct blob_attr *cur;
 235         int rem, ret;
 236
 237         iface->updated = 0;
 238
 239         blob_for_each_attr(cur, attr, rem) {
 240                 ret = interface_add_data(iface, cur);
 241                 if (ret)
 242                         return ret;
 243         }
 244
 245         if (iface->updated && iface->state == IFS_UP)
 246                 interface_event(iface, IFEV_UPDATE);
 247
 248         return 0;
 249 }
 250
 251 static void
 252 interface_event(struct interface *iface, enum interface_event ev)
 253 {
 254         struct interface_user *dep, *tmp;
 255         struct device *adev = NULL;
 256
 257         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 258                 dep->cb(dep, iface, ev);
 259
 260         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 261                 dep->cb(dep, iface, ev);
 262
 263         switch (ev) {
 264         case IFEV_UP:
 265                 interface_error_flush(iface);
 266                 adev = iface->l3_dev.dev;
 267                 fallthrough;
 268         case IFEV_DOWN:
 269         case IFEV_UP_FAILED:
 270                 alias_notify_device(iface->name, adev);
 271                 break;
 272         default:
 273                 break;
 274         }
 275 }
 276
 277 static void
 278 interface_flush_state(struct interface *iface)
 279 {
 280         if (iface->l3_dev.dev)
 281                 device_release(&iface->l3_dev);
 282         interface_data_flush(iface);
 283 }
 284
 285 static void
 286 mark_interface_down(struct interface *iface)
 287 {
 288         enum interface_state state = iface->state;
 289
 290         if (state == IFS_DOWN)
 291                 return;
 292
 293         iface->link_up_event = false;
 294         iface->state = IFS_DOWN;
 295         switch (state) {
 296         case IFS_UP:
 297         case IFS_TEARDOWN:
 298                 interface_event(iface, IFEV_DOWN);
 299                 break;
 300         case IFS_SETUP:
 301                 interface_event(iface, IFEV_UP_FAILED);
 302                 break;
 303         default:
 304                 break;
 305         }
 306         interface_ip_set_enabled(&iface->config_ip, false);
 307         interface_ip_set_enabled(&iface->proto_ip, false);
 308         interface_ip_flush(&iface->proto_ip);
 309         interface_flush_state(iface);
 310         system_flush_routes();
 311 }
 312
 313 static inline void
 314 __set_config_state(struct interface *iface, enum interface_config_state s)
 315 {
 316         iface->config_state = s;
 317 }
 318
 319 static void
 320 __interface_set_down(struct interface *iface, bool force)
 321 {
 322         enum interface_state state = iface->state;
 323         switch (state) {
 324         case IFS_UP:
 325         case IFS_SETUP:
 326                 iface->state = IFS_TEARDOWN;
 327                 if (iface->dynamic)
 328                         __set_config_state(iface, IFC_REMOVE);
 329
 330                 if (state == IFS_UP)
 331                         interface_event(iface, IFEV_DOWN);
 332
 333                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 334                 if (force)
 335                         interface_flush_state(iface);
 336                 break;
 337
 338         case IFS_DOWN:
 339                 if (iface->main_dev.dev)
 340                         device_release(&iface->main_dev);
 341                 break;
 342         case IFS_TEARDOWN:
 343         default:
 344                 break;
 345         }
 346 }
 347
 348 static int
 349 __interface_set_up(struct interface *iface)
 350 {
 351         int ret;
 352
 353         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 354
 355         iface->state = IFS_SETUP;
 356         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 357         if (ret)
 358                 mark_interface_down(iface);
 359
 360         return ret;
 361 }
 362
 363 static void
 364 interface_check_state(struct interface *iface)
 365 {
 366         bool link_state = iface->link_state || interface_force_link(iface);
 367
 368         switch (iface->state) {
 369         case IFS_UP:
 370         case IFS_SETUP:
 371                 if (!iface->enabled || !link_state) {
 372                         iface->state = IFS_TEARDOWN;
 373                         if (iface->dynamic)
 374                                 __set_config_state(iface, IFC_REMOVE);
 375
 376                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 377                 }
 378                 break;
 379         case IFS_DOWN:
 380                 if (!iface->available)
 381                         return;
 382
 383                 if (iface->autostart && iface->enabled && link_state && !config_init)
 384                         __interface_set_up(iface);
 385                 break;
 386         default:
 387                 break;
 388         }
 389 }
 390
 391 static void
 392 interface_set_enabled(struct interface *iface, bool new_state)
 393 {
 394         if (iface->enabled == new_state)
 395                 return;
 396
 397         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 398         iface->enabled = new_state;
 399         interface_check_state(iface);
 400 }
 401
 402 static void
 403 interface_set_link_state(struct interface *iface, bool new_state)
 404 {
 405         if (iface->link_state == new_state)
 406                 return;
 407
 408         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 409         iface->link_state = new_state;
 410         interface_check_state(iface);
 411
 412         if (new_state && interface_force_link(iface) &&
 413             iface->state == IFS_UP && !iface->link_up_event) {
 414                 interface_event(iface, IFEV_LINK_UP);
 415                 iface->link_up_event = true;
 416         }
 417 }
 418
 419 static void
 420 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 421 {
 422         if (ev == DEV_EVENT_REMOVE)
 423                 device_remove_user(dep);
 424 }
 425
 426 static void
 427 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 428 {
 429         struct interface *iface;
 430
 431         iface = container_of(dep, struct interface, main_dev);
 432         switch (ev) {
 433         case DEV_EVENT_ADD:
 434                 interface_set_available(iface, true);
 435                 break;
 436         case DEV_EVENT_REMOVE:
 437                 interface_set_available(iface, false);
 438                 if (dep->dev && dep->dev->external)
 439                         interface_set_main_dev(iface, NULL);
 440                 break;
 441         case DEV_EVENT_UP:
 442                 interface_set_enabled(iface, true);
 443                 break;
 444         case DEV_EVENT_DOWN:
 445                 interface_set_enabled(iface, false);
 446                 break;
 447         case DEV_EVENT_AUTH_UP:
 448         case DEV_EVENT_LINK_UP:
 449         case DEV_EVENT_LINK_DOWN:
 450                 interface_set_link_state(iface, device_link_active(dep->dev));
 451                 break;
 452         case DEV_EVENT_TOPO_CHANGE:
 453                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 454                 return;
 455         default:
 456                 break;
 457         }
 458 }
 459
 460 static void
 461 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 462 {
 463         struct interface *iface;
 464
 465         iface = container_of(dep, struct interface, l3_dev);
 466         if (iface->l3_dev.dev == iface->main_dev.dev)
 467                 return;
 468
 469         switch (ev) {
 470         case DEV_EVENT_LINK_DOWN:
 471                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 472                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 473                 break;
 474         default:
 475                 break;
 476         }
 477 }
 478
 479 void
 480 interface_set_available(struct interface *iface, bool new_state)
 481 {
 482         if (iface->available == new_state)
 483                 return;
 484
 485         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 486         iface->available = new_state;
 487
 488         if (new_state) {
 489                 if (iface->autostart && !config_init)
 490                         interface_set_up(iface);
 491         } else
 492                 __interface_set_down(iface, true);
 493 }
 494
 495 void
 496 interface_add_user(struct interface_user *dep, struct interface *iface)
 497 {
 498         if (!iface) {
 499                 list_add(&dep->list, &iface_all_users);
 500                 return;
 501         }
 502
 503         dep->iface = iface;
 504         list_add(&dep->list, &iface->users);
 505         if (iface->state == IFS_UP)
 506                 dep->cb(dep, iface, IFEV_UP);
 507 }
 508
 509 void
 510 interface_remove_user(struct interface_user *dep)
 511 {
 512         list_del_init(&dep->list);
 513         dep->iface = NULL;
 514 }
 515
 516 static void
 517 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 518 {
 519         struct blob_attr *cur;
 520         int rem;
 521
 522         blobmsg_for_each_attr(cur, list, rem) {
 523                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 524                         continue;
 525
 526                 if (!blobmsg_check_attr(cur, false))
 527                         continue;
 528
 529                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 530                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 531                 list_add(&c->head, &iface->assignment_classes);
 532         }
 533 }
 534
 535 static void
 536 interface_clear_assignment_classes(struct interface *iface)
 537 {
 538         while (!list_empty(&iface->assignment_classes)) {
 539                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 540                                 struct interface_assignment_class, head);
 541                 list_del(&c->head);
 542                 free(c);
 543         }
 544 }
 545
 546 static void
 547 interface_merge_assignment_data(struct interface *old, struct interface *new)
 548 {
 549         bool changed = (old->assignment_hint != new->assignment_hint ||
 550                         old->assignment_length != new->assignment_length ||
 551                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 552                         old->assignment_weight != new->assignment_weight ||
 553                         (old->assignment_iface_id_selection == IFID_FIXED &&
 554                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 555                                 sizeof(old->assignment_fixed_iface_id))) ||
 556                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 557
 558         struct interface_assignment_class *c;
 559         list_for_each_entry(c, &new->assignment_classes, head) {
 560                 /* Compare list entries one-by-one to see if there was a change */
 561                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 562                         changed = true;
 563
 564                 if (changed)
 565                         break;
 566
 567                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 568                                 struct interface_assignment_class, head);
 569
 570                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 571                         break;
 572
 573                 list_del(&c_old->head);
 574                 free(c_old);
 575         }
 576
 577         /* The old list was longer than the new one or the last entry didn't match */
 578         if (!list_empty(&old->assignment_classes)) {
 579                 interface_clear_assignment_classes(old);
 580                 changed = true;
 581         }
 582
 583         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 584
 585         if (changed) {
 586                 old->assignment_hint = new->assignment_hint;
 587                 old->assignment_length = new->assignment_length;
 588                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 589                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 590                 old->assignment_weight = new->assignment_weight;
 591                 interface_refresh_assignments(true);
 592         }
 593 }
 594
 595 static void
 596 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 597 {
 598         struct interface *alias = container_of(dep, struct interface, parent_iface);
 599         struct device *dev = iface->l3_dev.dev;
 600
 601         switch (ev) {
 602         case IFEV_UP:
 603                 if (!dev)
 604                         return;
 605
 606                 interface_set_main_dev(alias, dev);
 607                 interface_set_available(alias, true);
 608                 break;
 609         case IFEV_DOWN:
 610         case IFEV_UP_FAILED:
 611                 interface_set_available(alias, false);
 612                 interface_set_main_dev(alias, NULL);
 613                 break;
 614         case IFEV_FREE:
 615                 interface_remove_user(dep);
 616                 break;
 617         default:
 618                 break;
 619         }
 620 }
 621
 622 static void
 623 interface_set_device_config(struct interface *iface, struct device *dev)
 624 {
 625         if (!dev || !dev->default_config)
 626                 return;
 627
 628         if (!iface->device_config &&
 629             (!dev->iface_config || dev->config_iface != iface))
 630                 return;
 631
 632         dev->config_iface = iface;
 633         dev->iface_config = iface->device_config;
 634         device_apply_config(dev, dev->type, iface->config);
 635 }
 636
 637 static void
 638 interface_claim_device(struct interface *iface)
 639 {
 640         struct interface *parent;
 641         struct device *dev = NULL;
 642
 643         if (iface->parent_iface.iface)
 644                 interface_remove_user(&iface->parent_iface);
 645
 646         if (iface->parent_ifname) {
 647                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 648                 iface->parent_iface.cb = interface_alias_cb;
 649                 interface_add_user(&iface->parent_iface, parent);
 650         } else if (iface->device &&
 651                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 652                 dev = device_get(iface->device, true);
 653                 interface_set_device_config(iface, dev);
 654         } else {
 655                 dev = iface->ext_dev.dev;
 656         }
 657
 658         if (dev)
 659                 interface_set_main_dev(iface, dev);
 660
 661         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 662                 interface_set_available(iface, true);
 663 }
 664
 665 static void
 666 interface_cleanup_state(struct interface *iface)
 667 {
 668         interface_set_available(iface, false);
 669
 670         interface_flush_state(iface);
 671         interface_clear_errors(iface);
 672         interface_set_proto_state(iface, NULL);
 673
 674         interface_set_main_dev(iface, NULL);
 675         interface_set_l3_dev(iface, NULL);
 676 }
 677
 678 static void
 679 interface_cleanup(struct interface *iface)
 680 {
 681         struct interface_user *dep, *tmp;
 682
 683         uloop_timeout_cancel(&iface->remove_timer);
 684         device_remove_user(&iface->ext_dev);
 685
 686         if (iface->parent_iface.iface)
 687                 interface_remove_user(&iface->parent_iface);
 688
 689         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 690                 interface_remove_user(dep);
 691
 692         interface_clear_assignment_classes(iface);
 693         interface_ip_flush(&iface->config_ip);
 694         interface_cleanup_state(iface);
 695 }
 696
 697 static void
 698 interface_do_free(struct interface *iface)
 699 {
 700         interface_event(iface, IFEV_FREE);
 701         interface_cleanup(iface);
 702         free(iface->config);
 703         netifd_ubus_remove_interface(iface);
 704         avl_delete(&interfaces.avl, &iface->node.avl);
 705         if (iface->jail)
 706                 free(iface->jail);
 707         if (iface->jail_device)
 708                 free(iface->jail_device);
 709         if (iface->host_device)
 710                 free(iface->host_device);
 711
 712         free(iface);
 713 }
 714
 715 static void
 716 interface_do_reload(struct interface *iface)
 717 {
 718         interface_event(iface, IFEV_RELOAD);
 719         interface_cleanup_state(iface);
 720         proto_init_interface(iface, iface->config);
 721         interface_claim_device(iface);
 722 }
 723
 724 static void
 725 interface_handle_config_change(struct interface *iface)
 726 {
 727         enum interface_config_state state = iface->config_state;
 728
 729         iface->config_state = IFC_NORMAL;
 730         switch(state) {
 731         case IFC_NORMAL:
 732                 break;
 733         case IFC_RELOAD:
 734                 interface_do_reload(iface);
 735                 break;
 736         case IFC_REMOVE:
 737                 interface_do_free(iface);
 738                 return;
 739         }
 740         if (iface->autostart)
 741                 interface_set_up(iface);
 742 }
 743
 744 static void
 745 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 746 {
 747         struct interface *iface = state->iface;
 748
 749         switch (ev) {
 750         case IFPEV_UP:
 751                 if (iface->state != IFS_SETUP) {
 752                         if (iface->state == IFS_UP && iface->updated)
 753                                 interface_event(iface, IFEV_UPDATE);
 754                         return;
 755                 }
 756
 757                 if (!iface->l3_dev.dev)
 758                         interface_set_l3_dev(iface, iface->main_dev.dev);
 759
 760                 interface_ip_set_enabled(&iface->config_ip, true);
 761                 interface_ip_set_enabled(&iface->proto_ip, true);
 762                 system_flush_routes();
 763                 iface->state = IFS_UP;
 764                 iface->start_time = system_get_rtime();
 765                 interface_event(iface, IFEV_UP);
 766                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 767                 break;
 768         case IFPEV_DOWN:
 769                 if (iface->state == IFS_DOWN)
 770                         return;
 771
 772                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 773                 mark_interface_down(iface);
 774                 if (iface->main_dev.dev)
 775                         device_release(&iface->main_dev);
 776                 if (iface->l3_dev.dev)
 777                         device_remove_user(&iface->l3_dev);
 778                 interface_handle_config_change(iface);
 779                 break;
 780         case IFPEV_LINK_LOST:
 781                 if (iface->state != IFS_UP)
 782                         return;
 783
 784                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 785                 mark_interface_down(iface);
 786                 iface->state = IFS_SETUP;
 787                 break;
 788         default:
 789                 return;
 790         }
 791
 792         interface_write_resolv_conf(iface->jail);
 793 }
 794
 795 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 796 {
 797         if (iface->proto) {
 798                 iface->proto->free(iface->proto);
 799                 iface->proto = NULL;
 800         }
 801         iface->state = IFS_DOWN;
 802         iface->proto = state;
 803         if (!state)
 804                 return;
 805
 806         state->proto_event = interface_proto_event_cb;
 807         state->iface = iface;
 808 }
 809
 810 struct interface *
 811 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 812 {
 813         struct interface *iface;
 814         struct blob_attr *tb[IFACE_ATTR_MAX];
 815         struct blob_attr *cur;
 816         const char *proto_name = NULL;
 817         char *iface_name;
 818         bool force_link = false;
 819
 820         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 821         iface->name = strcpy(iface_name, name);
 822         INIT_LIST_HEAD(&iface->errors);
 823         INIT_LIST_HEAD(&iface->users);
 824         INIT_LIST_HEAD(&iface->hotplug_list);
 825         INIT_LIST_HEAD(&iface->assignment_classes);
 826         interface_ip_init(iface);
 827         avl_init(&iface->data, avl_strcmp, false, NULL);
 828         iface->config_ip.enabled = false;
 829
 830         iface->main_dev.cb = interface_main_dev_cb;
 831         iface->l3_dev.cb = interface_l3_dev_cb;
 832         iface->ext_dev.cb = interface_ext_dev_cb;
 833
 834         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 835                       blob_data(config), blob_len(config));
 836
 837         iface->zone = NULL;
 838         if ((cur = tb[IFACE_ATTR_ZONE]))
 839                 iface->zone = strdup(blobmsg_get_string(cur));
 840
 841         if ((cur = tb[IFACE_ATTR_PROTO]))
 842                 proto_name = blobmsg_data(cur);
 843
 844         proto_attach_interface(iface, proto_name);
 845         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 846                 force_link = true;
 847
 848         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 849         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 850         iface->dynamic = dynamic;
 851         iface->proto_ip.no_defaultroute =
 852                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 853         iface->proto_ip.no_dns =
 854                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 855
 856         if ((cur = tb[IFACE_ATTR_DNS]))
 857                 interface_add_dns_server_list(&iface->config_ip, cur);
 858
 859         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 860                 interface_add_dns_search_list(&iface->config_ip, cur);
 861
 862         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 863                 iface->dns_metric = blobmsg_get_u32(cur);
 864
 865         if ((cur = tb[IFACE_ATTR_METRIC]))
 866                 iface->metric = blobmsg_get_u32(cur);
 867
 868         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 869                 iface->assignment_length = blobmsg_get_u32(cur);
 870
 871         /* defaults */
 872         iface->assignment_iface_id_selection = IFID_FIXED;
 873         iface->assignment_fixed_iface_id = in6addr_any;
 874         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 875
 876         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 877                 const char *ifaceid = blobmsg_data(cur);
 878                 if (!strcmp(ifaceid, "random")) {
 879                         iface->assignment_iface_id_selection = IFID_RANDOM;
 880                 }
 881                 else if (!strcmp(ifaceid, "eui64")) {
 882                         iface->assignment_iface_id_selection = IFID_EUI64;
 883                 }
 884                 else {
 885                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 886                            if we cannot parse -> revert to iface id 1 */
 887                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 888                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 889                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 890                                 iface->assignment_fixed_iface_id = in6addr_any;
 891                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 892                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 893                                                         falling back to iface id 1.\n", iface->name);
 894                         }
 895                 }
 896         }
 897
 898         iface->assignment_hint = -1;
 899         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 900                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 901                                 ~((1 << (64 - iface->assignment_length)) - 1);
 902
 903         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 904                 interface_add_assignment_classes(iface, cur);
 905
 906         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 907                 iface->assignment_weight = blobmsg_get_u32(cur);
 908
 909         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 910                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 911                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 912         }
 913
 914         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 915                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 916                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 917         }
 918
 919         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 920
 921         iface->config_autostart = iface->autostart;
 922         iface->jail = NULL;
 923
 924         if ((cur = tb[IFACE_ATTR_JAIL])) {
 925                 iface->jail = strdup(blobmsg_get_string(cur));
 926                 iface->autostart = false;
 927         }
 928
 929         iface->jail_device = NULL;
 930         if ((cur = tb[IFACE_ATTR_JAIL_DEVICE]))
 931                 iface->jail_device = strdup(blobmsg_get_string(cur));
 932         else if ((cur = tb[IFACE_ATTR_JAIL_IFNAME]))
 933                 iface->jail_device = strdup(blobmsg_get_string(cur));
 934
 935         iface->host_device = NULL;
 936         if ((cur = tb[IFACE_ATTR_HOST_DEVICE]))
 937                 iface->host_device = strdup(blobmsg_get_string(cur));
 938
 939         return iface;
 940 }
 941
 942 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 943 {
 944         struct blob_attr *tb[IFACE_ATTR_MAX];
 945         struct blob_attr *cur;
 946         char *name = NULL;
 947
 948         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 949                       blob_data(config), blob_len(config));
 950
 951         if (alias) {
 952                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 953                         iface->parent_ifname = blobmsg_data(cur);
 954
 955                 if (!iface->parent_ifname)
 956                         return false;
 957         } else {
 958                 cur = tb[IFACE_ATTR_DEVICE];
 959                 if (!cur)
 960                         cur = tb[IFACE_ATTR_IFNAME];
 961                 if (cur)
 962                         iface->device = blobmsg_data(cur);
 963         }
 964
 965         if (iface->dynamic) {
 966                 name = strdup(iface->name);
 967
 968                 if (!name)
 969                         return false;
 970         }
 971
 972         iface->config = config;
 973         vlist_add(&interfaces, &iface->node, iface->name);
 974
 975         if (name) {
 976                 iface = vlist_find(&interfaces, name, iface, node);
 977                 free(name);
 978
 979                 /* Don't delete dynamic interface on reload */
 980                 if (iface)
 981                         iface->node.version = -1;
 982         }
 983
 984         return true;
 985 }
 986
 987 bool
 988 interface_add(struct interface *iface, struct blob_attr *config)
 989 {
 990         return __interface_add(iface, config, false);
 991 }
 992
 993 bool
 994 interface_add_alias(struct interface *iface, struct blob_attr *config)
 995 {
 996         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 997                 return false;
 998
 999         return __interface_add(iface, config, true);
1000 }
1001
1002 void
1003 interface_set_l3_dev(struct interface *iface, struct device *dev)
1004 {
1005         bool enabled = iface->config_ip.enabled;
1006         bool claimed = iface->l3_dev.claimed;
1007
1008         if (iface->l3_dev.dev == dev)
1009                 return;
1010
1011         interface_ip_set_enabled(&iface->config_ip, false);
1012         interface_ip_set_enabled(&iface->proto_ip, false);
1013         interface_ip_flush(&iface->proto_ip);
1014         device_add_user(&iface->l3_dev, dev);
1015
1016         if (dev) {
1017                 if (claimed) {
1018                         if (device_claim(&iface->l3_dev) < 0)
1019                                 return;
1020                 }
1021                 interface_ip_set_enabled(&iface->config_ip, enabled);
1022                 interface_ip_set_enabled(&iface->proto_ip, enabled);
1023         }
1024 }
1025
1026 static void
1027 interface_set_main_dev(struct interface *iface, struct device *dev)
1028 {
1029         bool claimed = iface->l3_dev.claimed;
1030
1031         if (iface->main_dev.dev == dev)
1032                 return;
1033
1034         interface_set_available(iface, false);
1035         device_add_user(&iface->main_dev, dev);
1036         if (!dev) {
1037                 interface_set_link_state(iface, false);
1038                 return;
1039         }
1040
1041         if (claimed) {
1042                 if (device_claim(&iface->l3_dev) < 0)
1043                         return;
1044         }
1045
1046         if (!iface->l3_dev.dev)
1047                 interface_set_l3_dev(iface, dev);
1048 }
1049
1050 static int
1051 interface_remove_link(struct interface *iface, struct device *dev,
1052                       struct blob_attr *vlan)
1053 {
1054         struct device *mdev = iface->main_dev.dev;
1055
1056         if (mdev && mdev->hotplug_ops)
1057                 return mdev->hotplug_ops->del(mdev, dev, vlan);
1058
1059         if (dev == iface->ext_dev.dev)
1060                 device_remove_user(&iface->ext_dev);
1061
1062         if (!iface->main_dev.hotplug)
1063                 return UBUS_STATUS_INVALID_ARGUMENT;
1064
1065         if (dev != iface->main_dev.dev)
1066                 return UBUS_STATUS_INVALID_ARGUMENT;
1067
1068         interface_set_main_dev(iface, NULL);
1069         return 0;
1070 }
1071
1072 static int
1073 interface_add_link(struct interface *iface, struct device *dev,
1074                    struct blob_attr *vlan, bool link_ext)
1075 {
1076         struct device *mdev = iface->main_dev.dev;
1077
1078         if (mdev == dev)
1079                 return 0;
1080
1081         if (iface->main_dev.hotplug)
1082                 device_remove_user(&iface->main_dev);
1083
1084         if (mdev) {
1085                 if (mdev->hotplug_ops)
1086                         return mdev->hotplug_ops->add(mdev, dev, vlan);
1087                 else
1088                         return UBUS_STATUS_NOT_SUPPORTED;
1089         }
1090
1091         if (link_ext)
1092                 device_add_user(&iface->ext_dev, dev);
1093
1094         interface_set_main_dev(iface, dev);
1095         iface->main_dev.hotplug = true;
1096         return 0;
1097 }
1098
1099 int
1100 interface_handle_link(struct interface *iface, const char *name,
1101                       struct blob_attr *vlan, bool add, bool link_ext)
1102 {
1103         struct device *dev;
1104
1105         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1106         if (!dev)
1107                 return UBUS_STATUS_NOT_FOUND;
1108
1109         if (!add)
1110                 return interface_remove_link(iface, dev, vlan);
1111
1112         interface_set_device_config(iface, dev);
1113         if (!link_ext)
1114                 device_set_present(dev, true);
1115
1116         return interface_add_link(iface, dev, vlan, link_ext);
1117 }
1118
1119 void
1120 interface_set_up(struct interface *iface)
1121 {
1122         int ret;
1123         const char *error = NULL;
1124
1125         iface->autostart = true;
1126
1127         if (iface->state != IFS_DOWN)
1128                 return;
1129
1130         interface_clear_errors(iface);
1131         if (iface->available) {
1132                 if (iface->main_dev.dev) {
1133                         ret = device_claim(&iface->main_dev);
1134                         if (!ret)
1135                                 interface_check_state(iface);
1136                         else
1137                                 error = "DEVICE_CLAIM_FAILED";
1138                 } else {
1139                         ret = __interface_set_up(iface);
1140                         if (ret)
1141                                 error = "SETUP_FAILED";
1142                 }
1143         } else
1144                 error = "NO_DEVICE";
1145
1146         if (error)
1147                 interface_add_error(iface, "interface", error, NULL, 0);
1148 }
1149
1150 void
1151 interface_set_down(struct interface *iface)
1152 {
1153         if (!iface) {
1154                 vlist_for_each_element(&interfaces, iface, node)
1155                         __interface_set_down(iface, false);
1156         } else {
1157                 iface->autostart = false;
1158                 __interface_set_down(iface, false);
1159         }
1160 }
1161
1162 int
1163 interface_renew(struct interface *iface)
1164 {
1165         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1166                 return -1;
1167
1168         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1169 }
1170
1171 void
1172 interface_start_pending(void)
1173 {
1174         struct interface *iface;
1175
1176         vlist_for_each_element(&interfaces, iface, node) {
1177                 if (iface->autostart)
1178                         interface_set_up(iface);
1179         }
1180 }
1181
1182 void
1183 interface_start_jail(int netns_fd, const char *jail)
1184 {
1185         struct interface *iface;
1186
1187         vlist_for_each_element(&interfaces, iface, node) {
1188                 if (!iface->jail || strcmp(iface->jail, jail))
1189                         continue;
1190
1191                 system_link_netns_move(iface->main_dev.dev, netns_fd, iface->jail_device);
1192         }
1193 }
1194
1195 void
1196 interface_stop_jail(int netns_fd)
1197 {
1198         struct interface *iface;
1199         char *orig_ifname;
1200
1201         vlist_for_each_element(&interfaces, iface, node) {
1202                 orig_ifname = iface->host_device;
1203                 interface_set_down(iface);
1204                 system_link_netns_move(iface->main_dev.dev, netns_fd, orig_ifname);
1205         }
1206 }
1207
1208 static void
1209 set_config_state(struct interface *iface, enum interface_config_state s)
1210 {
1211         __set_config_state(iface, s);
1212         if (iface->state == IFS_DOWN)
1213                 interface_handle_config_change(iface);
1214         else
1215                 __interface_set_down(iface, false);
1216 }
1217
1218 void
1219 interface_update_start(struct interface *iface, const bool keep_old)
1220 {
1221         iface->updated = 0;
1222
1223         if (!keep_old)
1224                 interface_ip_update_start(&iface->proto_ip);
1225 }
1226
1227 void
1228 interface_update_complete(struct interface *iface)
1229 {
1230         interface_ip_update_complete(&iface->proto_ip);
1231 }
1232
1233 static void
1234 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1235 {
1236         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1237         vlist_simple_replace(&new->dns_search, &old->dns_search);
1238 }
1239
1240 static bool
1241 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1242 {
1243         struct blob_attr *ntb[__DEV_ATTR_MAX];
1244         struct blob_attr *otb[__DEV_ATTR_MAX];
1245         struct device *dev = if_old->main_dev.dev;
1246         unsigned long diff = 0;
1247
1248         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1249
1250         if (!dev)
1251                 return false;
1252
1253         if (if_old->device_config != if_new->device_config)
1254                 return true;
1255
1256         if (!if_new->device_config)
1257                 return false;
1258
1259         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1260                 blob_data(if_old->config), blob_len(if_old->config));
1261
1262         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1263                 blob_data(if_new->config), blob_len(if_new->config));
1264
1265         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1266         return diff;
1267 }
1268
1269 static void
1270 interface_change_config(struct interface *if_old, struct interface *if_new)
1271 {
1272         struct blob_attr *old_config = if_old->config;
1273         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1274
1275 #define FIELD_CHANGED_STR(field)                                        \
1276                 ((!!if_old->field != !!if_new->field) ||                \
1277                  (if_old->field &&                                      \
1278                   strcmp(if_old->field, if_new->field) != 0))
1279
1280         if (FIELD_CHANGED_STR(parent_ifname)) {
1281                 if (if_old->parent_iface.iface)
1282                         interface_remove_user(&if_old->parent_iface);
1283                 reload = true;
1284         }
1285
1286         if (!reload && interface_device_config_changed(if_old, if_new))
1287                 reload = true;
1288
1289         if (FIELD_CHANGED_STR(device) ||
1290             if_old->proto_handler != if_new->proto_handler)
1291                 reload = true;
1292
1293         if (!if_old->proto_handler->config_params)
1294                 D(INTERFACE, "No config parameters for interface '%s'\n",
1295                   if_old->name);
1296         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1297                                        if_old->proto_handler->config_params))
1298                 reload = true;
1299
1300 #define UPDATE(field, __var) ({                                         \
1301                 bool __changed = (if_old->field != if_new->field);      \
1302                 if_old->field = if_new->field;                          \
1303                 __var |= __changed;                                     \
1304         })
1305
1306         if_old->config = if_new->config;
1307         if (if_old->config_autostart != if_new->config_autostart) {
1308                 if (if_old->config_autostart)
1309                         reload = true;
1310
1311                 if_old->autostart = if_new->config_autostart;
1312         }
1313
1314         if_old->device_config = if_new->device_config;
1315         if_old->config_autostart = if_new->config_autostart;
1316         if (if_old->jail)
1317                 free(if_old->jail);
1318
1319         if_old->jail = if_new->jail;
1320         if (if_old->jail)
1321                 if_old->autostart = false;
1322
1323         if (if_old->jail_device)
1324                 free(if_old->jail_device);
1325
1326         if_old->jail_device = if_new->jail_device;
1327
1328         if (if_old->host_device)
1329                 free(if_old->host_device);
1330
1331         if_old->host_device = if_new->host_device;
1332
1333         if_old->device = if_new->device;
1334         if_old->parent_ifname = if_new->parent_ifname;
1335         if_old->dynamic = if_new->dynamic;
1336         if_old->proto_handler = if_new->proto_handler;
1337         if_old->force_link = if_new->force_link;
1338         if_old->dns_metric = if_new->dns_metric;
1339
1340         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1341                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1342                 update_prefix_delegation = true;
1343         }
1344
1345         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1346         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1347
1348         UPDATE(metric, reload_ip);
1349         UPDATE(proto_ip.no_defaultroute, reload_ip);
1350         UPDATE(ip4table, reload_ip);
1351         UPDATE(ip6table, reload_ip);
1352         interface_merge_assignment_data(if_old, if_new);
1353
1354 #undef UPDATE
1355
1356         if (reload) {
1357                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1358                   if_old->name);
1359                 interface_clear_errors(if_old);
1360                 set_config_state(if_old, IFC_RELOAD);
1361                 goto out;
1362         }
1363
1364         if (reload_ip) {
1365                 bool config_ip_enabled = if_old->config_ip.enabled;
1366                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1367
1368                 interface_ip_set_enabled(&if_old->config_ip, false);
1369                 interface_ip_set_enabled(&if_old->proto_ip, false);
1370                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1371                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1372         }
1373
1374         if (update_prefix_delegation)
1375                 interface_update_prefix_delegation(&if_old->proto_ip);
1376
1377         interface_write_resolv_conf(if_old->jail);
1378         if (if_old->main_dev.dev)
1379                 interface_check_state(if_old);
1380
1381 out:
1382         if_new->config = NULL;
1383         interface_cleanup(if_new);
1384         free(old_config);
1385         free(if_new);
1386 }
1387
1388 static void
1389 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1390                  struct vlist_node *node_old)
1391 {
1392         struct interface *if_old = container_of(node_old, struct interface, node);
1393         struct interface *if_new = container_of(node_new, struct interface, node);
1394
1395         if (node_old && node_new) {
1396                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1397                 interface_change_config(if_old, if_new);
1398         } else if (node_old) {
1399                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1400                 set_config_state(if_old, IFC_REMOVE);
1401         } else if (node_new) {
1402                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1403                 interface_event(if_new, IFEV_CREATE);
1404                 proto_init_interface(if_new, if_new->config);
1405                 interface_claim_device(if_new);
1406                 netifd_ubus_add_interface(if_new);
1407         }
1408 }
1409
1410
1411 static void __init
1412 interface_init_list(void)
1413 {
1414         vlist_init(&interfaces, avl_strcmp, interface_update);
1415         interfaces.keep_old = true;
1416         interfaces.no_delete = true;
1417 }