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