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_IFNAME,
  34         IFACE_ATTR_PROTO,
  35         IFACE_ATTR_AUTO,
  36         IFACE_ATTR_JAIL,
  37         IFACE_ATTR_DEFAULTROUTE,
  38         IFACE_ATTR_PEERDNS,
  39         IFACE_ATTR_DNS,
  40         IFACE_ATTR_DNS_SEARCH,
  41         IFACE_ATTR_DNS_METRIC,
  42         IFACE_ATTR_METRIC,
  43         IFACE_ATTR_INTERFACE,
  44         IFACE_ATTR_IP6ASSIGN,
  45         IFACE_ATTR_IP6HINT,
  46         IFACE_ATTR_IP4TABLE,
  47         IFACE_ATTR_IP6TABLE,
  48         IFACE_ATTR_IP6CLASS,
  49         IFACE_ATTR_DELEGATE,
  50         IFACE_ATTR_IP6IFACEID,
  51         IFACE_ATTR_FORCE_LINK,
  52         IFACE_ATTR_IP6WEIGHT,
  53         IFACE_ATTR_MAX
  54 };
  55
  56 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  57         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  60         [IFACE_ATTR_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  62         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  63         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  64         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  67         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  73         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  74         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  77 };
  78
  79 const struct uci_blob_param_list interface_attr_list = {
  80         .n_params = IFACE_ATTR_MAX,
  81         .params = iface_attrs,
  82 };
  83
  84 static void
  85 interface_set_main_dev(struct interface *iface, struct device *dev);
  86 static void
  87 interface_event(struct interface *iface, enum interface_event ev);
  88
  89 static void
  90 interface_error_flush(struct interface *iface)
  91 {
  92         struct interface_error *error, *tmp;
  93
  94         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  95                 list_del(&error->list);
  96                 free(error);
  97         }
  98 }
  99
 100 static void
 101 interface_clear_errors(struct interface *iface)
 102 {
 103         /* don't flush the errors in case the configured protocol handler matches the
 104            running protocol handler and is having the last error capability */
 105         if (!(iface->proto &&
 106               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 107               (iface->proto->handler->name == iface->proto_handler->name)))
 108                 interface_error_flush(iface);
 109 }
 110
 111 void interface_add_error(struct interface *iface, const char *subsystem,
 112                          const char *code, const char **data, int n_data)
 113 {
 114         struct interface_error *error;
 115         int i, len = 0;
 116         int *datalen = NULL;
 117         char *dest, *d_subsys, *d_code;
 118
 119         /* if the configured protocol handler has the last error support capability,
 120            errors should only be added if the running protocol handler matches the
 121            configured one */
 122         if (iface->proto &&
 123             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 124             (iface->proto->handler->name != iface->proto_handler->name))
 125                 return;
 126
 127         if (n_data) {
 128                 len = n_data * sizeof(char *);
 129                 datalen = alloca(len);
 130                 for (i = 0; i < n_data; i++) {
 131                         datalen[i] = strlen(data[i]) + 1;
 132                         len += datalen[i];
 133                 }
 134         }
 135
 136         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 137                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 138                 &d_code, code ? strlen(code) + 1 : 0);
 139         if (!error)
 140                 return;
 141
 142         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 143            protocol can't be established (e.g auth failure) */
 144         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 145                 interface_error_flush(iface);
 146
 147         list_add_tail(&error->list, &iface->errors);
 148
 149         dest = (char *) &error->data[n_data + 1];
 150         for (i = 0; i < n_data; i++) {
 151                 error->data[i] = dest;
 152                 memcpy(dest, data[i], datalen[i]);
 153                 dest += datalen[i];
 154         }
 155         error->data[n_data] = NULL;
 156
 157         if (subsystem)
 158                 error->subsystem = strcpy(d_subsys, subsystem);
 159
 160         if (code)
 161                 error->code = strcpy(d_code, code);
 162 }
 163
 164 static void
 165 interface_data_del(struct interface *iface, struct interface_data *data)
 166 {
 167         avl_delete(&iface->data, &data->node);
 168         free(data);
 169 }
 170
 171 static void
 172 interface_data_flush(struct interface *iface)
 173 {
 174         struct interface_data *d, *tmp;
 175
 176         avl_for_each_element_safe(&iface->data, d, node, tmp)
 177                 interface_data_del(iface, d);
 178 }
 179
 180 int
 181 interface_add_data(struct interface *iface, const struct blob_attr *data)
 182 {
 183         struct interface_data *n, *o;
 184
 185         if (!blobmsg_check_attr(data, true))
 186                 return UBUS_STATUS_INVALID_ARGUMENT;
 187
 188         const char *name = blobmsg_name(data);
 189         unsigned len = blob_pad_len(data);
 190
 191         o = avl_find_element(&iface->data, name, o, node);
 192         if (o) {
 193                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 194                         return 0;
 195
 196                 interface_data_del(iface, o);
 197         }
 198
 199         n = calloc(1, sizeof(*n) + len);
 200         if (!n)
 201                 return UBUS_STATUS_UNKNOWN_ERROR;
 202
 203         memcpy(n->data, data, len);
 204         n->node.key = blobmsg_name(n->data);
 205         avl_insert(&iface->data, &n->node);
 206
 207         iface->updated |= IUF_DATA;
 208         return 0;
 209 }
 210
 211 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 212 {
 213         struct blob_attr *cur;
 214         int rem, ret;
 215
 216         iface->updated = 0;
 217
 218         blob_for_each_attr(cur, attr, rem) {
 219                 ret = interface_add_data(iface, cur);
 220                 if (ret)
 221                         return ret;
 222         }
 223
 224         if (iface->updated && iface->state == IFS_UP)
 225                 interface_event(iface, IFEV_UPDATE);
 226
 227         return 0;
 228 }
 229
 230 static void
 231 interface_event(struct interface *iface, enum interface_event ev)
 232 {
 233         struct interface_user *dep, *tmp;
 234         struct device *adev = NULL;
 235
 236         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 237                 dep->cb(dep, iface, ev);
 238
 239         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 240                 dep->cb(dep, iface, ev);
 241
 242         switch (ev) {
 243         case IFEV_UP:
 244                 interface_error_flush(iface);
 245                 adev = iface->l3_dev.dev;
 246                 /* fall through */
 247         case IFEV_DOWN:
 248         case IFEV_UP_FAILED:
 249                 alias_notify_device(iface->name, adev);
 250                 break;
 251         default:
 252                 break;
 253         }
 254 }
 255
 256 static void
 257 interface_flush_state(struct interface *iface)
 258 {
 259         if (iface->l3_dev.dev)
 260                 device_release(&iface->l3_dev);
 261         interface_data_flush(iface);
 262 }
 263
 264 static void
 265 mark_interface_down(struct interface *iface)
 266 {
 267         enum interface_state state = iface->state;
 268
 269         if (state == IFS_DOWN)
 270                 return;
 271
 272         iface->link_up_event = false;
 273         iface->state = IFS_DOWN;
 274         switch (state) {
 275         case IFS_UP:
 276         case IFS_TEARDOWN:
 277                 interface_event(iface, IFEV_DOWN);
 278                 break;
 279         case IFS_SETUP:
 280                 interface_event(iface, IFEV_UP_FAILED);
 281                 break;
 282         default:
 283                 break;
 284         }
 285         interface_ip_set_enabled(&iface->config_ip, false);
 286         interface_ip_set_enabled(&iface->proto_ip, false);
 287         interface_ip_flush(&iface->proto_ip);
 288         interface_flush_state(iface);
 289         system_flush_routes();
 290 }
 291
 292 static inline void
 293 __set_config_state(struct interface *iface, enum interface_config_state s)
 294 {
 295         iface->config_state = s;
 296 }
 297
 298 static void
 299 __interface_set_down(struct interface *iface, bool force)
 300 {
 301         enum interface_state state = iface->state;
 302         switch (state) {
 303         case IFS_UP:
 304         case IFS_SETUP:
 305                 iface->state = IFS_TEARDOWN;
 306                 if (iface->dynamic)
 307                         __set_config_state(iface, IFC_REMOVE);
 308
 309                 if (state == IFS_UP)
 310                         interface_event(iface, IFEV_DOWN);
 311
 312                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 313                 if (force)
 314                         interface_flush_state(iface);
 315                 break;
 316
 317         case IFS_DOWN:
 318                 if (iface->main_dev.dev)
 319                         device_release(&iface->main_dev);
 320         case IFS_TEARDOWN:
 321         default:
 322                 break;
 323         }
 324 }
 325
 326 static int
 327 __interface_set_up(struct interface *iface)
 328 {
 329         int ret;
 330
 331         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 332
 333         iface->state = IFS_SETUP;
 334         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 335         if (ret)
 336                 mark_interface_down(iface);
 337
 338         return ret;
 339 }
 340
 341 static void
 342 interface_check_state(struct interface *iface)
 343 {
 344         bool link_state = iface->link_state || iface->force_link;
 345
 346         switch (iface->state) {
 347         case IFS_UP:
 348         case IFS_SETUP:
 349                 if (!iface->enabled || !link_state) {
 350                         iface->state = IFS_TEARDOWN;
 351                         if (iface->dynamic)
 352                                 __set_config_state(iface, IFC_REMOVE);
 353
 354                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 355                 }
 356                 break;
 357         case IFS_DOWN:
 358                 if (!iface->available)
 359                         return;
 360
 361                 if (iface->autostart && iface->enabled && link_state && !config_init)
 362                         __interface_set_up(iface);
 363                 break;
 364         default:
 365                 break;
 366         }
 367 }
 368
 369 static void
 370 interface_set_enabled(struct interface *iface, bool new_state)
 371 {
 372         if (iface->enabled == new_state)
 373                 return;
 374
 375         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 376         iface->enabled = new_state;
 377         interface_check_state(iface);
 378 }
 379
 380 static void
 381 interface_set_link_state(struct interface *iface, bool new_state)
 382 {
 383         if (iface->link_state == new_state)
 384                 return;
 385
 386         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 387         iface->link_state = new_state;
 388         interface_check_state(iface);
 389
 390         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 391                 interface_event(iface, IFEV_LINK_UP);
 392                 iface->link_up_event = true;
 393         }
 394 }
 395
 396 static void
 397 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 398 {
 399         if (ev == DEV_EVENT_REMOVE)
 400                 device_remove_user(dep);
 401 }
 402
 403 static void
 404 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 405 {
 406         struct interface *iface;
 407
 408         iface = container_of(dep, struct interface, main_dev);
 409         switch (ev) {
 410         case DEV_EVENT_ADD:
 411                 interface_set_available(iface, true);
 412                 break;
 413         case DEV_EVENT_REMOVE:
 414                 interface_set_available(iface, false);
 415                 if (dep->dev && dep->dev->external)
 416                         interface_set_main_dev(iface, NULL);
 417                 break;
 418         case DEV_EVENT_UP:
 419                 interface_set_enabled(iface, true);
 420                 break;
 421         case DEV_EVENT_DOWN:
 422                 interface_set_enabled(iface, false);
 423                 break;
 424         case DEV_EVENT_LINK_UP:
 425                 interface_set_link_state(iface, true);
 426                 break;
 427         case DEV_EVENT_LINK_DOWN:
 428                 interface_set_link_state(iface, false);
 429                 break;
 430         case DEV_EVENT_TOPO_CHANGE:
 431                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 432                 return;
 433         default:
 434                 break;
 435         }
 436 }
 437
 438 static void
 439 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 440 {
 441         struct interface *iface;
 442
 443         iface = container_of(dep, struct interface, l3_dev);
 444         if (iface->l3_dev.dev == iface->main_dev.dev)
 445                 return;
 446
 447         switch (ev) {
 448         case DEV_EVENT_LINK_DOWN:
 449                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 450                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 451                 break;
 452         default:
 453                 break;
 454         }
 455 }
 456
 457 void
 458 interface_set_available(struct interface *iface, bool new_state)
 459 {
 460         if (iface->available == new_state)
 461                 return;
 462
 463         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 464         iface->available = new_state;
 465
 466         if (new_state) {
 467                 if (iface->autostart && !config_init)
 468                         interface_set_up(iface);
 469         } else
 470                 __interface_set_down(iface, true);
 471 }
 472
 473 void
 474 interface_add_user(struct interface_user *dep, struct interface *iface)
 475 {
 476         if (!iface) {
 477                 list_add(&dep->list, &iface_all_users);
 478                 return;
 479         }
 480
 481         dep->iface = iface;
 482         list_add(&dep->list, &iface->users);
 483         if (iface->state == IFS_UP)
 484                 dep->cb(dep, iface, IFEV_UP);
 485 }
 486
 487 void
 488 interface_remove_user(struct interface_user *dep)
 489 {
 490         list_del_init(&dep->list);
 491         dep->iface = NULL;
 492 }
 493
 494 static void
 495 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 496 {
 497         struct blob_attr *cur;
 498         int rem;
 499
 500         blobmsg_for_each_attr(cur, list, rem) {
 501                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 502                         continue;
 503
 504                 if (!blobmsg_check_attr(cur, false))
 505                         continue;
 506
 507                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 508                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 509                 list_add(&c->head, &iface->assignment_classes);
 510         }
 511 }
 512
 513 static void
 514 interface_clear_assignment_classes(struct interface *iface)
 515 {
 516         while (!list_empty(&iface->assignment_classes)) {
 517                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 518                                 struct interface_assignment_class, head);
 519                 list_del(&c->head);
 520                 free(c);
 521         }
 522 }
 523
 524 static void
 525 interface_merge_assignment_data(struct interface *old, struct interface *new)
 526 {
 527         bool changed = (old->assignment_hint != new->assignment_hint ||
 528                         old->assignment_length != new->assignment_length ||
 529                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 530                         old->assignment_weight != new->assignment_weight ||
 531                         (old->assignment_iface_id_selection == IFID_FIXED &&
 532                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 533                                 sizeof(old->assignment_fixed_iface_id))) ||
 534                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 535
 536         struct interface_assignment_class *c;
 537         list_for_each_entry(c, &new->assignment_classes, head) {
 538                 /* Compare list entries one-by-one to see if there was a change */
 539                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 540                         changed = true;
 541
 542                 if (changed)
 543                         break;
 544
 545                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 546                                 struct interface_assignment_class, head);
 547
 548                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 549                         break;
 550
 551                 list_del(&c_old->head);
 552                 free(c_old);
 553         }
 554
 555         /* The old list was longer than the new one or the last entry didn't match */
 556         if (!list_empty(&old->assignment_classes)) {
 557                 interface_clear_assignment_classes(old);
 558                 changed = true;
 559         }
 560
 561         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 562
 563         if (changed) {
 564                 old->assignment_hint = new->assignment_hint;
 565                 old->assignment_length = new->assignment_length;
 566                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 567                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 568                 old->assignment_weight = new->assignment_weight;
 569                 interface_refresh_assignments(true);
 570         }
 571 }
 572
 573 static void
 574 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 575 {
 576         struct interface *alias = container_of(dep, struct interface, parent_iface);
 577         struct device *dev = iface->l3_dev.dev;
 578
 579         switch (ev) {
 580         case IFEV_UP:
 581                 if (!dev)
 582                         return;
 583
 584                 interface_set_main_dev(alias, dev);
 585                 interface_set_available(alias, true);
 586                 break;
 587         case IFEV_DOWN:
 588         case IFEV_UP_FAILED:
 589                 interface_set_available(alias, false);
 590                 interface_set_main_dev(alias, NULL);
 591                 break;
 592         case IFEV_FREE:
 593                 interface_remove_user(dep);
 594                 break;
 595         default:
 596                 break;
 597         }
 598 }
 599
 600 static void
 601 interface_set_device_config(struct interface *iface, struct device *dev)
 602 {
 603         if (!dev || !dev->default_config)
 604                 return;
 605
 606         if (!iface->device_config &&
 607             (!dev->iface_config || dev->config_iface != iface))
 608                 return;
 609
 610         dev->config_iface = iface;
 611         dev->iface_config = iface->device_config;
 612         device_apply_config(dev, dev->type, iface->config);
 613 }
 614
 615 static void
 616 interface_claim_device(struct interface *iface)
 617 {
 618         struct interface *parent;
 619         struct device *dev = NULL;
 620
 621         if (iface->parent_iface.iface)
 622                 interface_remove_user(&iface->parent_iface);
 623
 624         device_lock();
 625
 626         if (iface->parent_ifname) {
 627                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 628                 iface->parent_iface.cb = interface_alias_cb;
 629                 interface_add_user(&iface->parent_iface, parent);
 630         } else if (iface->ifname &&
 631                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 632                 dev = device_get(iface->ifname, true);
 633                 interface_set_device_config(iface, dev);
 634         } else {
 635                 dev = iface->ext_dev.dev;
 636         }
 637
 638         if (dev)
 639                 interface_set_main_dev(iface, dev);
 640
 641         device_unlock();
 642
 643         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 644                 interface_set_available(iface, true);
 645 }
 646
 647 static void
 648 interface_cleanup_state(struct interface *iface)
 649 {
 650         interface_set_available(iface, false);
 651
 652         interface_flush_state(iface);
 653         interface_clear_errors(iface);
 654         interface_set_proto_state(iface, NULL);
 655
 656         interface_set_main_dev(iface, NULL);
 657         interface_set_l3_dev(iface, NULL);
 658 }
 659
 660 static void
 661 interface_cleanup(struct interface *iface)
 662 {
 663         struct interface_user *dep, *tmp;
 664
 665         uloop_timeout_cancel(&iface->remove_timer);
 666         device_remove_user(&iface->ext_dev);
 667
 668         if (iface->parent_iface.iface)
 669                 interface_remove_user(&iface->parent_iface);
 670
 671         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 672                 interface_remove_user(dep);
 673
 674         interface_clear_assignment_classes(iface);
 675         interface_ip_flush(&iface->config_ip);
 676         interface_cleanup_state(iface);
 677 }
 678
 679 static void
 680 interface_do_free(struct interface *iface)
 681 {
 682         interface_event(iface, IFEV_FREE);
 683         interface_cleanup(iface);
 684         free(iface->config);
 685         netifd_ubus_remove_interface(iface);
 686         avl_delete(&interfaces.avl, &iface->node.avl);
 687         if (iface->jail)
 688                 free(iface->jail);
 689
 690         free(iface);
 691 }
 692
 693 static void
 694 interface_do_reload(struct interface *iface)
 695 {
 696         interface_event(iface, IFEV_RELOAD);
 697         interface_cleanup_state(iface);
 698         proto_init_interface(iface, iface->config);
 699         interface_claim_device(iface);
 700 }
 701
 702 static void
 703 interface_handle_config_change(struct interface *iface)
 704 {
 705         enum interface_config_state state = iface->config_state;
 706
 707         iface->config_state = IFC_NORMAL;
 708         switch(state) {
 709         case IFC_NORMAL:
 710                 break;
 711         case IFC_RELOAD:
 712                 interface_do_reload(iface);
 713                 break;
 714         case IFC_REMOVE:
 715                 interface_do_free(iface);
 716                 return;
 717         }
 718         if (iface->autostart)
 719                 interface_set_up(iface);
 720 }
 721
 722 static void
 723 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 724 {
 725         struct interface *iface = state->iface;
 726
 727         switch (ev) {
 728         case IFPEV_UP:
 729                 if (iface->state != IFS_SETUP) {
 730                         if (iface->state == IFS_UP && iface->updated)
 731                                 interface_event(iface, IFEV_UPDATE);
 732                         return;
 733                 }
 734
 735                 if (!iface->l3_dev.dev)
 736                         interface_set_l3_dev(iface, iface->main_dev.dev);
 737
 738                 interface_ip_set_enabled(&iface->config_ip, true);
 739                 interface_ip_set_enabled(&iface->proto_ip, true);
 740                 system_flush_routes();
 741                 iface->state = IFS_UP;
 742                 iface->start_time = system_get_rtime();
 743                 interface_event(iface, IFEV_UP);
 744                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 745                 break;
 746         case IFPEV_DOWN:
 747                 if (iface->state == IFS_DOWN)
 748                         return;
 749
 750                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 751                 mark_interface_down(iface);
 752                 if (iface->main_dev.dev)
 753                         device_release(&iface->main_dev);
 754                 if (iface->l3_dev.dev)
 755                         device_remove_user(&iface->l3_dev);
 756                 interface_handle_config_change(iface);
 757                 break;
 758         case IFPEV_LINK_LOST:
 759                 if (iface->state != IFS_UP)
 760                         return;
 761
 762                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 763                 mark_interface_down(iface);
 764                 iface->state = IFS_SETUP;
 765                 break;
 766         default:
 767                 return;
 768         }
 769
 770         interface_write_resolv_conf(iface->jail);
 771 }
 772
 773 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 774 {
 775         if (iface->proto) {
 776                 iface->proto->free(iface->proto);
 777                 iface->proto = NULL;
 778         }
 779         iface->state = IFS_DOWN;
 780         iface->proto = state;
 781         if (!state)
 782                 return;
 783
 784         state->proto_event = interface_proto_event_cb;
 785         state->iface = iface;
 786 }
 787
 788 struct interface *
 789 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 790 {
 791         struct interface *iface;
 792         struct blob_attr *tb[IFACE_ATTR_MAX];
 793         struct blob_attr *cur;
 794         const char *proto_name = NULL;
 795         char *iface_name;
 796         bool force_link = false;
 797
 798         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 799         iface->name = strcpy(iface_name, name);
 800         INIT_LIST_HEAD(&iface->errors);
 801         INIT_LIST_HEAD(&iface->users);
 802         INIT_LIST_HEAD(&iface->hotplug_list);
 803         INIT_LIST_HEAD(&iface->assignment_classes);
 804         interface_ip_init(iface);
 805         avl_init(&iface->data, avl_strcmp, false, NULL);
 806         iface->config_ip.enabled = false;
 807
 808         iface->main_dev.cb = interface_main_dev_cb;
 809         iface->l3_dev.cb = interface_l3_dev_cb;
 810         iface->ext_dev.cb = interface_ext_dev_cb;
 811
 812         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 813                       blob_data(config), blob_len(config));
 814
 815         if ((cur = tb[IFACE_ATTR_PROTO]))
 816                 proto_name = blobmsg_data(cur);
 817
 818         proto_attach_interface(iface, proto_name);
 819         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 820                 force_link = true;
 821
 822         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 823         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 824         iface->dynamic = dynamic;
 825         iface->proto_ip.no_defaultroute =
 826                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 827         iface->proto_ip.no_dns =
 828                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 829
 830         if ((cur = tb[IFACE_ATTR_DNS]))
 831                 interface_add_dns_server_list(&iface->config_ip, cur);
 832
 833         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 834                 interface_add_dns_search_list(&iface->config_ip, cur);
 835
 836         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 837                 iface->dns_metric = blobmsg_get_u32(cur);
 838
 839         if ((cur = tb[IFACE_ATTR_METRIC]))
 840                 iface->metric = blobmsg_get_u32(cur);
 841
 842         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 843                 iface->assignment_length = blobmsg_get_u32(cur);
 844
 845         /* defaults */
 846         iface->assignment_iface_id_selection = IFID_FIXED;
 847         iface->assignment_fixed_iface_id = in6addr_any;
 848         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 849
 850         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 851                 const char *ifaceid = blobmsg_data(cur);
 852                 if (!strcmp(ifaceid, "random")) {
 853                         iface->assignment_iface_id_selection = IFID_RANDOM;
 854                 }
 855                 else if (!strcmp(ifaceid, "eui64")) {
 856                         iface->assignment_iface_id_selection = IFID_EUI64;
 857                 }
 858                 else {
 859                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 860                            if we cannot parse -> revert to iface id 1 */
 861                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 862                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 863                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 864                                 iface->assignment_fixed_iface_id = in6addr_any;
 865                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 866                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 867                                                         falling back to iface id 1.\n", iface->name);
 868                         }
 869                 }
 870         }
 871
 872         iface->assignment_hint = -1;
 873         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 874                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 875                                 ~((1 << (64 - iface->assignment_length)) - 1);
 876
 877         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 878                 interface_add_assignment_classes(iface, cur);
 879
 880         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 881                 iface->assignment_weight = blobmsg_get_u32(cur);
 882
 883         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 884                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 885                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 886         }
 887
 888         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 889                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 890                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 891         }
 892
 893         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 894
 895         iface->config_autostart = iface->autostart;
 896         iface->jail = NULL;
 897
 898         if ((cur = tb[IFACE_ATTR_JAIL])) {
 899                 iface->jail = strdup(blobmsg_get_string(cur));
 900                 iface->autostart = false;
 901         }
 902
 903         return iface;
 904 }
 905
 906 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 907 {
 908         struct blob_attr *tb[IFACE_ATTR_MAX];
 909         struct blob_attr *cur;
 910         char *name = NULL;
 911
 912         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 913                       blob_data(config), blob_len(config));
 914
 915         if (alias) {
 916                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 917                         iface->parent_ifname = blobmsg_data(cur);
 918
 919                 if (!iface->parent_ifname)
 920                         return false;
 921         } else {
 922                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 923                         iface->ifname = blobmsg_data(cur);
 924         }
 925
 926         if (iface->dynamic) {
 927                 name = strdup(iface->name);
 928
 929                 if (!name)
 930                         return false;
 931         }
 932
 933         iface->config = config;
 934         vlist_add(&interfaces, &iface->node, iface->name);
 935
 936         if (name) {
 937                 iface = vlist_find(&interfaces, name, iface, node);
 938                 free(name);
 939
 940                 /* Don't delete dynamic interface on reload */
 941                 if (iface)
 942                         iface->node.version = -1;
 943         }
 944
 945         return true;
 946 }
 947
 948 bool
 949 interface_add(struct interface *iface, struct blob_attr *config)
 950 {
 951         return __interface_add(iface, config, false);
 952 }
 953
 954 bool
 955 interface_add_alias(struct interface *iface, struct blob_attr *config)
 956 {
 957         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 958                 return false;
 959
 960         return __interface_add(iface, config, true);
 961 }
 962
 963 void
 964 interface_set_l3_dev(struct interface *iface, struct device *dev)
 965 {
 966         bool enabled = iface->config_ip.enabled;
 967         bool claimed = iface->l3_dev.claimed;
 968
 969         if (iface->l3_dev.dev == dev)
 970                 return;
 971
 972         interface_ip_set_enabled(&iface->config_ip, false);
 973         interface_ip_set_enabled(&iface->proto_ip, false);
 974         interface_ip_flush(&iface->proto_ip);
 975         device_add_user(&iface->l3_dev, dev);
 976
 977         if (dev) {
 978                 if (claimed) {
 979                         if (device_claim(&iface->l3_dev) < 0)
 980                                 return;
 981                 }
 982                 interface_ip_set_enabled(&iface->config_ip, enabled);
 983                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 984         }
 985 }
 986
 987 static void
 988 interface_set_main_dev(struct interface *iface, struct device *dev)
 989 {
 990         bool claimed = iface->l3_dev.claimed;
 991
 992         if (iface->main_dev.dev == dev)
 993                 return;
 994
 995         interface_set_available(iface, false);
 996         device_add_user(&iface->main_dev, dev);
 997         if (!dev) {
 998                 interface_set_link_state(iface, false);
 999                 return;
1000         }
1001
1002         if (claimed) {
1003                 if (device_claim(&iface->l3_dev) < 0)
1004                         return;
1005         }
1006
1007         if (!iface->l3_dev.dev)
1008                 interface_set_l3_dev(iface, dev);
1009 }
1010
1011 static int
1012 interface_remove_link(struct interface *iface, struct device *dev)
1013 {
1014         struct device *mdev = iface->main_dev.dev;
1015
1016         if (mdev && mdev->hotplug_ops)
1017                 return mdev->hotplug_ops->del(mdev, dev);
1018
1019         if (dev == iface->ext_dev.dev)
1020                 device_remove_user(&iface->ext_dev);
1021
1022         if (!iface->main_dev.hotplug)
1023                 return UBUS_STATUS_INVALID_ARGUMENT;
1024
1025         if (dev != iface->main_dev.dev)
1026                 return UBUS_STATUS_INVALID_ARGUMENT;
1027
1028         interface_set_main_dev(iface, NULL);
1029         return 0;
1030 }
1031
1032 static int
1033 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
1034 {
1035         struct device *mdev = iface->main_dev.dev;
1036
1037         if (mdev == dev)
1038                 return 0;
1039
1040         if (iface->main_dev.hotplug)
1041                 device_remove_user(&iface->main_dev);
1042
1043         if (mdev) {
1044                 if (mdev->hotplug_ops)
1045                         return mdev->hotplug_ops->add(mdev, dev);
1046                 else
1047                         return UBUS_STATUS_NOT_SUPPORTED;
1048         }
1049
1050         if (link_ext)
1051                 device_add_user(&iface->ext_dev, dev);
1052
1053         interface_set_main_dev(iface, dev);
1054         iface->main_dev.hotplug = true;
1055         return 0;
1056 }
1057
1058 int
1059 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1060 {
1061         struct device *dev;
1062         int ret;
1063
1064         device_lock();
1065
1066         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1067         if (!dev) {
1068                 ret = UBUS_STATUS_NOT_FOUND;
1069                 goto out;
1070         }
1071
1072         if (add) {
1073                 interface_set_device_config(iface, dev);
1074                 device_set_present(dev, true);
1075
1076                 ret = interface_add_link(iface, dev, link_ext);
1077         } else {
1078                 ret = interface_remove_link(iface, dev);
1079         }
1080
1081 out:
1082         device_unlock();
1083
1084         return ret;
1085 }
1086
1087 void
1088 interface_set_up(struct interface *iface)
1089 {
1090         int ret;
1091         const char *error = NULL;
1092
1093         iface->autostart = true;
1094
1095         if (iface->state != IFS_DOWN)
1096                 return;
1097
1098         interface_clear_errors(iface);
1099         if (iface->available) {
1100                 if (iface->main_dev.dev) {
1101                         ret = device_claim(&iface->main_dev);
1102                         if (!ret)
1103                                 interface_check_state(iface);
1104                         else
1105                                 error = "DEVICE_CLAIM_FAILED";
1106                 } else {
1107                         ret = __interface_set_up(iface);
1108                         if (ret)
1109                                 error = "SETUP_FAILED";
1110                 }
1111         } else
1112                 error = "NO_DEVICE";
1113
1114         if (error)
1115                 interface_add_error(iface, "interface", error, NULL, 0);
1116 }
1117
1118 void
1119 interface_set_down(struct interface *iface)
1120 {
1121         if (!iface) {
1122                 vlist_for_each_element(&interfaces, iface, node)
1123                         __interface_set_down(iface, false);
1124         } else {
1125                 iface->autostart = false;
1126                 __interface_set_down(iface, false);
1127         }
1128 }
1129
1130 int
1131 interface_renew(struct interface *iface)
1132 {
1133         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1134                 return -1;
1135
1136         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1137 }
1138
1139 void
1140 interface_start_pending(void)
1141 {
1142         struct interface *iface;
1143
1144         vlist_for_each_element(&interfaces, iface, node) {
1145                 if (iface->autostart)
1146                         interface_set_up(iface);
1147         }
1148 }
1149
1150 void
1151 interface_start_jail(const char *jail, const pid_t netns_pid)
1152 {
1153         struct interface *iface;
1154         int netns_fd;
1155         int wstatus;
1156         pid_t pr = 0;
1157
1158         netns_fd = system_netns_open(netns_pid);
1159         if (netns_fd < 0)
1160                 return;
1161
1162         vlist_for_each_element(&interfaces, iface, node) {
1163                 if (!iface->jail || strcmp(iface->jail, jail))
1164                         continue;
1165
1166                 system_link_netns_move(iface->ifname, netns_fd);
1167         }
1168
1169         pr = fork();
1170         if (pr) {
1171                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1172                 close(netns_fd);
1173                 return;
1174         }
1175
1176         system_netns_set(netns_fd);
1177         system_init();
1178         vlist_for_each_element(&interfaces, iface, node) {
1179                 if (!iface->jail || strcmp(iface->jail, jail))
1180                         continue;
1181
1182                 interface_set_up(iface);
1183         }
1184         _exit(0);
1185 }
1186
1187 void
1188 interface_stop_jail(const char *jail, const pid_t netns_pid)
1189 {
1190         struct interface *iface;
1191         int netns_fd, root_netns;
1192         int wstatus;
1193         pid_t pr = 0;
1194
1195         netns_fd = system_netns_open(netns_pid);
1196         if (netns_fd < 0)
1197                 return;
1198
1199         root_netns = system_netns_open(getpid());
1200         if (root_netns < 0)
1201                 return;
1202
1203         pr = fork();
1204         if (pr) {
1205                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1206                 close(netns_fd);
1207                 close(root_netns);
1208                 return;
1209         }
1210
1211         system_netns_set(netns_fd);
1212         system_init();
1213         vlist_for_each_element(&interfaces, iface, node) {
1214                 if (!iface->jail || strcmp(iface->jail, jail))
1215                         continue;
1216
1217                 interface_set_down(iface);
1218                 system_link_netns_move(iface->ifname, root_netns);
1219         }
1220         _exit(0);
1221 }
1222
1223 static void
1224 set_config_state(struct interface *iface, enum interface_config_state s)
1225 {
1226         __set_config_state(iface, s);
1227         if (iface->state == IFS_DOWN)
1228                 interface_handle_config_change(iface);
1229         else
1230                 __interface_set_down(iface, false);
1231 }
1232
1233 void
1234 interface_update_start(struct interface *iface, const bool keep_old)
1235 {
1236         iface->updated = 0;
1237
1238         if (!keep_old)
1239                 interface_ip_update_start(&iface->proto_ip);
1240 }
1241
1242 void
1243 interface_update_complete(struct interface *iface)
1244 {
1245         interface_ip_update_complete(&iface->proto_ip);
1246 }
1247
1248 static void
1249 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1250 {
1251         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1252         vlist_simple_replace(&new->dns_search, &old->dns_search);
1253 }
1254
1255 static bool
1256 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1257 {
1258         struct blob_attr *ntb[__DEV_ATTR_MAX];
1259         struct blob_attr *otb[__DEV_ATTR_MAX];
1260         struct device *dev = if_old->main_dev.dev;
1261         unsigned long diff = 0;
1262
1263         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1264
1265         if (!dev)
1266                 return false;
1267
1268         if (if_old->device_config != if_new->device_config)
1269                 return true;
1270
1271         if (!if_new->device_config)
1272                 return false;
1273
1274         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1275                 blob_data(if_old->config), blob_len(if_old->config));
1276
1277         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1278                 blob_data(if_new->config), blob_len(if_new->config));
1279
1280         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1281         return diff;
1282 }
1283
1284 static void
1285 interface_change_config(struct interface *if_old, struct interface *if_new)
1286 {
1287         struct blob_attr *old_config = if_old->config;
1288         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1289
1290 #define FIELD_CHANGED_STR(field)                                        \
1291                 ((!!if_old->field != !!if_new->field) ||                \
1292                  (if_old->field &&                                      \
1293                   strcmp(if_old->field, if_new->field) != 0))
1294
1295         if (FIELD_CHANGED_STR(parent_ifname)) {
1296                 if (if_old->parent_iface.iface)
1297                         interface_remove_user(&if_old->parent_iface);
1298                 reload = true;
1299         }
1300
1301         if (!reload && interface_device_config_changed(if_old, if_new))
1302                 reload = true;
1303
1304         if (FIELD_CHANGED_STR(ifname) ||
1305             if_old->proto_handler != if_new->proto_handler)
1306                 reload = true;
1307
1308         if (!if_old->proto_handler->config_params)
1309                 D(INTERFACE, "No config parameters for interface '%s'\n",
1310                   if_old->name);
1311         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1312                                        if_old->proto_handler->config_params))
1313                 reload = true;
1314
1315 #define UPDATE(field, __var) ({                                         \
1316                 bool __changed = (if_old->field != if_new->field);      \
1317                 if_old->field = if_new->field;                          \
1318                 __var |= __changed;                                     \
1319         })
1320
1321         if_old->config = if_new->config;
1322         if (if_old->config_autostart != if_new->config_autostart) {
1323                 if (if_old->config_autostart)
1324                         reload = true;
1325
1326                 if_old->autostart = if_new->config_autostart;
1327         }
1328
1329         if_old->device_config = if_new->device_config;
1330         if_old->config_autostart = if_new->config_autostart;
1331         if (if_old->jail)
1332                 free(if_old->jail);
1333
1334         if_old->jail = if_new->jail;
1335         if (if_old->jail)
1336                 if_old->autostart = false;
1337
1338         if_old->ifname = if_new->ifname;
1339         if_old->parent_ifname = if_new->parent_ifname;
1340         if_old->dynamic = if_new->dynamic;
1341         if_old->proto_handler = if_new->proto_handler;
1342         if_old->force_link = if_new->force_link;
1343         if_old->dns_metric = if_new->dns_metric;
1344
1345         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1346                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1347                 update_prefix_delegation = true;
1348         }
1349
1350         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1351         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1352
1353         UPDATE(metric, reload_ip);
1354         UPDATE(proto_ip.no_defaultroute, reload_ip);
1355         UPDATE(ip4table, reload_ip);
1356         UPDATE(ip6table, reload_ip);
1357         interface_merge_assignment_data(if_old, if_new);
1358
1359 #undef UPDATE
1360
1361         if (reload) {
1362                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1363                   if_old->name);
1364                 interface_clear_errors(if_old);
1365                 set_config_state(if_old, IFC_RELOAD);
1366                 goto out;
1367         }
1368
1369         if (reload_ip) {
1370                 bool config_ip_enabled = if_old->config_ip.enabled;
1371                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1372
1373                 interface_ip_set_enabled(&if_old->config_ip, false);
1374                 interface_ip_set_enabled(&if_old->proto_ip, false);
1375                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1376                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1377         }
1378
1379         if (update_prefix_delegation)
1380                 interface_update_prefix_delegation(&if_old->proto_ip);
1381
1382         interface_write_resolv_conf(if_old->jail);
1383         if (if_old->main_dev.dev)
1384                 interface_check_state(if_old);
1385
1386 out:
1387         if_new->config = NULL;
1388         interface_cleanup(if_new);
1389         free(old_config);
1390         free(if_new);
1391 }
1392
1393 static void
1394 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1395                  struct vlist_node *node_old)
1396 {
1397         struct interface *if_old = container_of(node_old, struct interface, node);
1398         struct interface *if_new = container_of(node_new, struct interface, node);
1399
1400         if (node_old && node_new) {
1401                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1402                 interface_change_config(if_old, if_new);
1403         } else if (node_old) {
1404                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1405                 set_config_state(if_old, IFC_REMOVE);
1406         } else if (node_new) {
1407                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1408                 interface_event(if_new, IFEV_CREATE);
1409                 proto_init_interface(if_new, if_new->config);
1410                 interface_claim_device(if_new);
1411                 netifd_ubus_add_interface(if_new);
1412         }
1413 }
1414
1415
1416 static void __init
1417 interface_init_list(void)
1418 {
1419         vlist_init(&interfaces, avl_strcmp, interface_update);
1420         interfaces.keep_old = true;
1421         interfaces.no_delete = true;
1422 }