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