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_IFNAME,
  39         IFACE_ATTR_DEFAULTROUTE,
  40         IFACE_ATTR_PEERDNS,
  41         IFACE_ATTR_DNS,
  42         IFACE_ATTR_DNS_SEARCH,
  43         IFACE_ATTR_DNS_METRIC,
  44         IFACE_ATTR_METRIC,
  45         IFACE_ATTR_INTERFACE,
  46         IFACE_ATTR_IP6ASSIGN,
  47         IFACE_ATTR_IP6HINT,
  48         IFACE_ATTR_IP4TABLE,
  49         IFACE_ATTR_IP6TABLE,
  50         IFACE_ATTR_IP6CLASS,
  51         IFACE_ATTR_DELEGATE,
  52         IFACE_ATTR_IP6IFACEID,
  53         IFACE_ATTR_FORCE_LINK,
  54         IFACE_ATTR_IP6WEIGHT,
  55         IFACE_ATTR_MAX
  56 };
  57
  58 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  59         [IFACE_ATTR_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  63         [IFACE_ATTR_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_JAIL_IFNAME] = { .name = "jail_ifname", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  68         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  70         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  71         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  73         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  78         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  80         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  81 };
  82
  83 const struct uci_blob_param_list interface_attr_list = {
  84         .n_params = IFACE_ATTR_MAX,
  85         .params = iface_attrs,
  86 };
  87
  88 static void
  89 interface_set_main_dev(struct interface *iface, struct device *dev);
  90 static void
  91 interface_event(struct interface *iface, enum interface_event ev);
  92
  93 static void
  94 interface_error_flush(struct interface *iface)
  95 {
  96         struct interface_error *error, *tmp;
  97
  98         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  99                 list_del(&error->list);
 100                 free(error);
 101         }
 102 }
 103
 104 static bool
 105 interface_force_link(struct interface *iface)
 106 {
 107         struct device *dev = iface->main_dev.dev;
 108
 109         if (dev && dev->settings.auth)
 110                 return false;
 111
 112         return iface->force_link;
 113 }
 114
 115 static void
 116 interface_clear_errors(struct interface *iface)
 117 {
 118         /* don't flush the errors in case the configured protocol handler matches the
 119            running protocol handler and is having the last error capability */
 120         if (!(iface->proto &&
 121               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 122               (iface->proto->handler->name == iface->proto_handler->name)))
 123                 interface_error_flush(iface);
 124 }
 125
 126 void interface_add_error(struct interface *iface, const char *subsystem,
 127                          const char *code, const char **data, int n_data)
 128 {
 129         struct interface_error *error;
 130         int i, len = 0;
 131         int *datalen = NULL;
 132         char *dest, *d_subsys, *d_code;
 133
 134         /* if the configured protocol handler has the last error support capability,
 135            errors should only be added if the running protocol handler matches the
 136            configured one */
 137         if (iface->proto &&
 138             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 139             (iface->proto->handler->name != iface->proto_handler->name))
 140                 return;
 141
 142         if (n_data) {
 143                 len = n_data * sizeof(char *);
 144                 datalen = alloca(len);
 145                 for (i = 0; i < n_data; i++) {
 146                         datalen[i] = strlen(data[i]) + 1;
 147                         len += datalen[i];
 148                 }
 149         }
 150
 151         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 152                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 153                 &d_code, code ? strlen(code) + 1 : 0);
 154         if (!error)
 155                 return;
 156
 157         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 158            protocol can't be established (e.g auth failure) */
 159         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 160                 interface_error_flush(iface);
 161
 162         list_add_tail(&error->list, &iface->errors);
 163
 164         dest = (char *) &error->data[n_data + 1];
 165         for (i = 0; i < n_data; i++) {
 166                 error->data[i] = dest;
 167                 memcpy(dest, data[i], datalen[i]);
 168                 dest += datalen[i];
 169         }
 170         error->data[n_data] = NULL;
 171
 172         if (subsystem)
 173                 error->subsystem = strcpy(d_subsys, subsystem);
 174
 175         if (code)
 176                 error->code = strcpy(d_code, code);
 177 }
 178
 179 static void
 180 interface_data_del(struct interface *iface, struct interface_data *data)
 181 {
 182         avl_delete(&iface->data, &data->node);
 183         free(data);
 184 }
 185
 186 static void
 187 interface_data_flush(struct interface *iface)
 188 {
 189         struct interface_data *d, *tmp;
 190
 191         avl_for_each_element_safe(&iface->data, d, node, tmp)
 192                 interface_data_del(iface, d);
 193 }
 194
 195 int
 196 interface_add_data(struct interface *iface, const struct blob_attr *data)
 197 {
 198         struct interface_data *n, *o;
 199
 200         if (!blobmsg_check_attr(data, true))
 201                 return UBUS_STATUS_INVALID_ARGUMENT;
 202
 203         const char *name = blobmsg_name(data);
 204         unsigned len = blob_pad_len(data);
 205
 206         o = avl_find_element(&iface->data, name, o, node);
 207         if (o) {
 208                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 209                         return 0;
 210
 211                 interface_data_del(iface, o);
 212         }
 213
 214         n = calloc(1, sizeof(*n) + len);
 215         if (!n)
 216                 return UBUS_STATUS_UNKNOWN_ERROR;
 217
 218         memcpy(n->data, data, len);
 219         n->node.key = blobmsg_name(n->data);
 220         avl_insert(&iface->data, &n->node);
 221
 222         iface->updated |= IUF_DATA;
 223         return 0;
 224 }
 225
 226 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 227 {
 228         struct blob_attr *cur;
 229         int rem, ret;
 230
 231         iface->updated = 0;
 232
 233         blob_for_each_attr(cur, attr, rem) {
 234                 ret = interface_add_data(iface, cur);
 235                 if (ret)
 236                         return ret;
 237         }
 238
 239         if (iface->updated && iface->state == IFS_UP)
 240                 interface_event(iface, IFEV_UPDATE);
 241
 242         return 0;
 243 }
 244
 245 static void
 246 interface_event(struct interface *iface, enum interface_event ev)
 247 {
 248         struct interface_user *dep, *tmp;
 249         struct device *adev = NULL;
 250
 251         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 252                 dep->cb(dep, iface, ev);
 253
 254         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 255                 dep->cb(dep, iface, ev);
 256
 257         switch (ev) {
 258         case IFEV_UP:
 259                 interface_error_flush(iface);
 260                 adev = iface->l3_dev.dev;
 261                 fallthrough;
 262         case IFEV_DOWN:
 263         case IFEV_UP_FAILED:
 264                 alias_notify_device(iface->name, adev);
 265                 break;
 266         default:
 267                 break;
 268         }
 269 }
 270
 271 static void
 272 interface_flush_state(struct interface *iface)
 273 {
 274         if (iface->l3_dev.dev)
 275                 device_release(&iface->l3_dev);
 276         interface_data_flush(iface);
 277 }
 278
 279 static void
 280 mark_interface_down(struct interface *iface)
 281 {
 282         enum interface_state state = iface->state;
 283
 284         if (state == IFS_DOWN)
 285                 return;
 286
 287         iface->link_up_event = false;
 288         iface->state = IFS_DOWN;
 289         switch (state) {
 290         case IFS_UP:
 291         case IFS_TEARDOWN:
 292                 interface_event(iface, IFEV_DOWN);
 293                 break;
 294         case IFS_SETUP:
 295                 interface_event(iface, IFEV_UP_FAILED);
 296                 break;
 297         default:
 298                 break;
 299         }
 300         interface_ip_set_enabled(&iface->config_ip, false);
 301         interface_ip_set_enabled(&iface->proto_ip, false);
 302         interface_ip_flush(&iface->proto_ip);
 303         interface_flush_state(iface);
 304         system_flush_routes();
 305 }
 306
 307 static inline void
 308 __set_config_state(struct interface *iface, enum interface_config_state s)
 309 {
 310         iface->config_state = s;
 311 }
 312
 313 static void
 314 __interface_set_down(struct interface *iface, bool force)
 315 {
 316         enum interface_state state = iface->state;
 317         switch (state) {
 318         case IFS_UP:
 319         case IFS_SETUP:
 320                 iface->state = IFS_TEARDOWN;
 321                 if (iface->dynamic)
 322                         __set_config_state(iface, IFC_REMOVE);
 323
 324                 if (state == IFS_UP)
 325                         interface_event(iface, IFEV_DOWN);
 326
 327                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 328                 if (force)
 329                         interface_flush_state(iface);
 330                 break;
 331
 332         case IFS_DOWN:
 333                 if (iface->main_dev.dev)
 334                         device_release(&iface->main_dev);
 335                 break;
 336         case IFS_TEARDOWN:
 337         default:
 338                 break;
 339         }
 340 }
 341
 342 static int
 343 __interface_set_up(struct interface *iface)
 344 {
 345         int ret;
 346
 347         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 348
 349         iface->state = IFS_SETUP;
 350         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 351         if (ret)
 352                 mark_interface_down(iface);
 353
 354         return ret;
 355 }
 356
 357 static void
 358 interface_check_state(struct interface *iface)
 359 {
 360         bool link_state = iface->link_state || interface_force_link(iface);
 361
 362         switch (iface->state) {
 363         case IFS_UP:
 364         case IFS_SETUP:
 365                 if (!iface->enabled || !link_state) {
 366                         iface->state = IFS_TEARDOWN;
 367                         if (iface->dynamic)
 368                                 __set_config_state(iface, IFC_REMOVE);
 369
 370                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 371                 }
 372                 break;
 373         case IFS_DOWN:
 374                 if (!iface->available)
 375                         return;
 376
 377                 if (iface->autostart && iface->enabled && link_state && !config_init)
 378                         __interface_set_up(iface);
 379                 break;
 380         default:
 381                 break;
 382         }
 383 }
 384
 385 static void
 386 interface_set_enabled(struct interface *iface, bool new_state)
 387 {
 388         if (iface->enabled == new_state)
 389                 return;
 390
 391         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 392         iface->enabled = new_state;
 393         interface_check_state(iface);
 394 }
 395
 396 static void
 397 interface_set_link_state(struct interface *iface, bool new_state)
 398 {
 399         if (iface->link_state == new_state)
 400                 return;
 401
 402         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 403         iface->link_state = new_state;
 404         interface_check_state(iface);
 405
 406         if (new_state && interface_force_link(iface) &&
 407             iface->state == IFS_UP && !iface->link_up_event) {
 408                 interface_event(iface, IFEV_LINK_UP);
 409                 iface->link_up_event = true;
 410         }
 411 }
 412
 413 static void
 414 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 415 {
 416         if (ev == DEV_EVENT_REMOVE)
 417                 device_remove_user(dep);
 418 }
 419
 420 static void
 421 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 422 {
 423         struct interface *iface;
 424
 425         iface = container_of(dep, struct interface, main_dev);
 426         switch (ev) {
 427         case DEV_EVENT_ADD:
 428                 interface_set_available(iface, true);
 429                 break;
 430         case DEV_EVENT_REMOVE:
 431                 interface_set_available(iface, false);
 432                 if (dep->dev && dep->dev->external)
 433                         interface_set_main_dev(iface, NULL);
 434                 break;
 435         case DEV_EVENT_UP:
 436                 interface_set_enabled(iface, true);
 437                 break;
 438         case DEV_EVENT_DOWN:
 439                 interface_set_enabled(iface, false);
 440                 break;
 441         case DEV_EVENT_AUTH_UP:
 442         case DEV_EVENT_LINK_UP:
 443         case DEV_EVENT_LINK_DOWN:
 444                 interface_set_link_state(iface, device_link_active(dep->dev));
 445                 break;
 446         case DEV_EVENT_TOPO_CHANGE:
 447                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 448                 return;
 449         default:
 450                 break;
 451         }
 452 }
 453
 454 static void
 455 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 456 {
 457         struct interface *iface;
 458
 459         iface = container_of(dep, struct interface, l3_dev);
 460         if (iface->l3_dev.dev == iface->main_dev.dev)
 461                 return;
 462
 463         switch (ev) {
 464         case DEV_EVENT_LINK_DOWN:
 465                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 466                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 467                 break;
 468         default:
 469                 break;
 470         }
 471 }
 472
 473 void
 474 interface_set_available(struct interface *iface, bool new_state)
 475 {
 476         if (iface->available == new_state)
 477                 return;
 478
 479         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 480         iface->available = new_state;
 481
 482         if (new_state) {
 483                 if (iface->autostart && !config_init)
 484                         interface_set_up(iface);
 485         } else
 486                 __interface_set_down(iface, true);
 487 }
 488
 489 void
 490 interface_add_user(struct interface_user *dep, struct interface *iface)
 491 {
 492         if (!iface) {
 493                 list_add(&dep->list, &iface_all_users);
 494                 return;
 495         }
 496
 497         dep->iface = iface;
 498         list_add(&dep->list, &iface->users);
 499         if (iface->state == IFS_UP)
 500                 dep->cb(dep, iface, IFEV_UP);
 501 }
 502
 503 void
 504 interface_remove_user(struct interface_user *dep)
 505 {
 506         list_del_init(&dep->list);
 507         dep->iface = NULL;
 508 }
 509
 510 static void
 511 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 512 {
 513         struct blob_attr *cur;
 514         int rem;
 515
 516         blobmsg_for_each_attr(cur, list, rem) {
 517                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 518                         continue;
 519
 520                 if (!blobmsg_check_attr(cur, false))
 521                         continue;
 522
 523                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 524                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 525                 list_add(&c->head, &iface->assignment_classes);
 526         }
 527 }
 528
 529 static void
 530 interface_clear_assignment_classes(struct interface *iface)
 531 {
 532         while (!list_empty(&iface->assignment_classes)) {
 533                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 534                                 struct interface_assignment_class, head);
 535                 list_del(&c->head);
 536                 free(c);
 537         }
 538 }
 539
 540 static void
 541 interface_merge_assignment_data(struct interface *old, struct interface *new)
 542 {
 543         bool changed = (old->assignment_hint != new->assignment_hint ||
 544                         old->assignment_length != new->assignment_length ||
 545                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 546                         old->assignment_weight != new->assignment_weight ||
 547                         (old->assignment_iface_id_selection == IFID_FIXED &&
 548                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 549                                 sizeof(old->assignment_fixed_iface_id))) ||
 550                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 551
 552         struct interface_assignment_class *c;
 553         list_for_each_entry(c, &new->assignment_classes, head) {
 554                 /* Compare list entries one-by-one to see if there was a change */
 555                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 556                         changed = true;
 557
 558                 if (changed)
 559                         break;
 560
 561                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 562                                 struct interface_assignment_class, head);
 563
 564                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 565                         break;
 566
 567                 list_del(&c_old->head);
 568                 free(c_old);
 569         }
 570
 571         /* The old list was longer than the new one or the last entry didn't match */
 572         if (!list_empty(&old->assignment_classes)) {
 573                 interface_clear_assignment_classes(old);
 574                 changed = true;
 575         }
 576
 577         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 578
 579         if (changed) {
 580                 old->assignment_hint = new->assignment_hint;
 581                 old->assignment_length = new->assignment_length;
 582                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 583                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 584                 old->assignment_weight = new->assignment_weight;
 585                 interface_refresh_assignments(true);
 586         }
 587 }
 588
 589 static void
 590 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 591 {
 592         struct interface *alias = container_of(dep, struct interface, parent_iface);
 593         struct device *dev = iface->l3_dev.dev;
 594
 595         switch (ev) {
 596         case IFEV_UP:
 597                 if (!dev)
 598                         return;
 599
 600                 interface_set_main_dev(alias, dev);
 601                 interface_set_available(alias, true);
 602                 break;
 603         case IFEV_DOWN:
 604         case IFEV_UP_FAILED:
 605                 interface_set_available(alias, false);
 606                 interface_set_main_dev(alias, NULL);
 607                 break;
 608         case IFEV_FREE:
 609                 interface_remove_user(dep);
 610                 break;
 611         default:
 612                 break;
 613         }
 614 }
 615
 616 static void
 617 interface_set_device_config(struct interface *iface, struct device *dev)
 618 {
 619         if (!dev || !dev->default_config)
 620                 return;
 621
 622         if (!iface->device_config &&
 623             (!dev->iface_config || dev->config_iface != iface))
 624                 return;
 625
 626         dev->config_iface = iface;
 627         dev->iface_config = iface->device_config;
 628         device_apply_config(dev, dev->type, iface->config);
 629 }
 630
 631 static void
 632 interface_claim_device(struct interface *iface)
 633 {
 634         struct interface *parent;
 635         struct device *dev = NULL;
 636
 637         if (iface->parent_iface.iface)
 638                 interface_remove_user(&iface->parent_iface);
 639
 640         device_lock();
 641
 642         if (iface->parent_ifname) {
 643                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 644                 iface->parent_iface.cb = interface_alias_cb;
 645                 interface_add_user(&iface->parent_iface, parent);
 646         } else if (iface->device &&
 647                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 648                 dev = device_get(iface->device, true);
 649                 interface_set_device_config(iface, dev);
 650         } else {
 651                 dev = iface->ext_dev.dev;
 652         }
 653
 654         if (dev)
 655                 interface_set_main_dev(iface, dev);
 656
 657         device_unlock();
 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_ifname)
 706                 free(iface->jail_ifname);
 707
 708         free(iface);
 709 }
 710
 711 static void
 712 interface_do_reload(struct interface *iface)
 713 {
 714         interface_event(iface, IFEV_RELOAD);
 715         interface_cleanup_state(iface);
 716         proto_init_interface(iface, iface->config);
 717         interface_claim_device(iface);
 718 }
 719
 720 static void
 721 interface_handle_config_change(struct interface *iface)
 722 {
 723         enum interface_config_state state = iface->config_state;
 724
 725         iface->config_state = IFC_NORMAL;
 726         switch(state) {
 727         case IFC_NORMAL:
 728                 break;
 729         case IFC_RELOAD:
 730                 interface_do_reload(iface);
 731                 break;
 732         case IFC_REMOVE:
 733                 interface_do_free(iface);
 734                 return;
 735         }
 736         if (iface->autostart)
 737                 interface_set_up(iface);
 738 }
 739
 740 static void
 741 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 742 {
 743         struct interface *iface = state->iface;
 744
 745         switch (ev) {
 746         case IFPEV_UP:
 747                 if (iface->state != IFS_SETUP) {
 748                         if (iface->state == IFS_UP && iface->updated)
 749                                 interface_event(iface, IFEV_UPDATE);
 750                         return;
 751                 }
 752
 753                 if (!iface->l3_dev.dev)
 754                         interface_set_l3_dev(iface, iface->main_dev.dev);
 755
 756                 interface_ip_set_enabled(&iface->config_ip, true);
 757                 interface_ip_set_enabled(&iface->proto_ip, true);
 758                 system_flush_routes();
 759                 iface->state = IFS_UP;
 760                 iface->start_time = system_get_rtime();
 761                 interface_event(iface, IFEV_UP);
 762                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 763                 break;
 764         case IFPEV_DOWN:
 765                 if (iface->state == IFS_DOWN)
 766                         return;
 767
 768                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 769                 mark_interface_down(iface);
 770                 if (iface->main_dev.dev)
 771                         device_release(&iface->main_dev);
 772                 if (iface->l3_dev.dev)
 773                         device_remove_user(&iface->l3_dev);
 774                 interface_handle_config_change(iface);
 775                 break;
 776         case IFPEV_LINK_LOST:
 777                 if (iface->state != IFS_UP)
 778                         return;
 779
 780                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 781                 mark_interface_down(iface);
 782                 iface->state = IFS_SETUP;
 783                 break;
 784         default:
 785                 return;
 786         }
 787
 788         interface_write_resolv_conf(iface->jail);
 789 }
 790
 791 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 792 {
 793         if (iface->proto) {
 794                 iface->proto->free(iface->proto);
 795                 iface->proto = NULL;
 796         }
 797         iface->state = IFS_DOWN;
 798         iface->proto = state;
 799         if (!state)
 800                 return;
 801
 802         state->proto_event = interface_proto_event_cb;
 803         state->iface = iface;
 804 }
 805
 806 struct interface *
 807 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 808 {
 809         struct interface *iface;
 810         struct blob_attr *tb[IFACE_ATTR_MAX];
 811         struct blob_attr *cur;
 812         const char *proto_name = NULL;
 813         char *iface_name;
 814         bool force_link = false;
 815
 816         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 817         iface->name = strcpy(iface_name, name);
 818         INIT_LIST_HEAD(&iface->errors);
 819         INIT_LIST_HEAD(&iface->users);
 820         INIT_LIST_HEAD(&iface->hotplug_list);
 821         INIT_LIST_HEAD(&iface->assignment_classes);
 822         interface_ip_init(iface);
 823         avl_init(&iface->data, avl_strcmp, false, NULL);
 824         iface->config_ip.enabled = false;
 825
 826         iface->main_dev.cb = interface_main_dev_cb;
 827         iface->l3_dev.cb = interface_l3_dev_cb;
 828         iface->ext_dev.cb = interface_ext_dev_cb;
 829
 830         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 831                       blob_data(config), blob_len(config));
 832
 833         if ((cur = tb[IFACE_ATTR_PROTO]))
 834                 proto_name = blobmsg_data(cur);
 835
 836         proto_attach_interface(iface, proto_name);
 837         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 838                 force_link = true;
 839
 840         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 841         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 842         iface->dynamic = dynamic;
 843         iface->proto_ip.no_defaultroute =
 844                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 845         iface->proto_ip.no_dns =
 846                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 847
 848         if ((cur = tb[IFACE_ATTR_DNS]))
 849                 interface_add_dns_server_list(&iface->config_ip, cur);
 850
 851         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 852                 interface_add_dns_search_list(&iface->config_ip, cur);
 853
 854         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 855                 iface->dns_metric = blobmsg_get_u32(cur);
 856
 857         if ((cur = tb[IFACE_ATTR_METRIC]))
 858                 iface->metric = blobmsg_get_u32(cur);
 859
 860         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 861                 iface->assignment_length = blobmsg_get_u32(cur);
 862
 863         /* defaults */
 864         iface->assignment_iface_id_selection = IFID_FIXED;
 865         iface->assignment_fixed_iface_id = in6addr_any;
 866         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 867
 868         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 869                 const char *ifaceid = blobmsg_data(cur);
 870                 if (!strcmp(ifaceid, "random")) {
 871                         iface->assignment_iface_id_selection = IFID_RANDOM;
 872                 }
 873                 else if (!strcmp(ifaceid, "eui64")) {
 874                         iface->assignment_iface_id_selection = IFID_EUI64;
 875                 }
 876                 else {
 877                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 878                            if we cannot parse -> revert to iface id 1 */
 879                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 880                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 881                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 882                                 iface->assignment_fixed_iface_id = in6addr_any;
 883                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 884                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 885                                                         falling back to iface id 1.\n", iface->name);
 886                         }
 887                 }
 888         }
 889
 890         iface->assignment_hint = -1;
 891         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 892                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 893                                 ~((1 << (64 - iface->assignment_length)) - 1);
 894
 895         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 896                 interface_add_assignment_classes(iface, cur);
 897
 898         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 899                 iface->assignment_weight = blobmsg_get_u32(cur);
 900
 901         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 902                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 903                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 904         }
 905
 906         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 907                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 908                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 909         }
 910
 911         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 912
 913         iface->config_autostart = iface->autostart;
 914         iface->jail = NULL;
 915
 916         if ((cur = tb[IFACE_ATTR_JAIL])) {
 917                 iface->jail = strdup(blobmsg_get_string(cur));
 918                 iface->autostart = false;
 919         }
 920
 921         iface->jail_ifname = NULL;
 922         if ((cur = tb[IFACE_ATTR_JAIL_IFNAME]))
 923                 iface->jail_ifname = strdup(blobmsg_get_string(cur));
 924
 925         return iface;
 926 }
 927
 928 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 929 {
 930         struct blob_attr *tb[IFACE_ATTR_MAX];
 931         struct blob_attr *cur;
 932         char *name = NULL;
 933
 934         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 935                       blob_data(config), blob_len(config));
 936
 937         if (alias) {
 938                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 939                         iface->parent_ifname = blobmsg_data(cur);
 940
 941                 if (!iface->parent_ifname)
 942                         return false;
 943         } else {
 944                 cur = tb[IFACE_ATTR_DEVICE];
 945                 if (!cur)
 946                         cur = tb[IFACE_ATTR_IFNAME];
 947                 if (cur)
 948                         iface->device = blobmsg_data(cur);
 949         }
 950
 951         if (iface->dynamic) {
 952                 name = strdup(iface->name);
 953
 954                 if (!name)
 955                         return false;
 956         }
 957
 958         iface->config = config;
 959         vlist_add(&interfaces, &iface->node, iface->name);
 960
 961         if (name) {
 962                 iface = vlist_find(&interfaces, name, iface, node);
 963                 free(name);
 964
 965                 /* Don't delete dynamic interface on reload */
 966                 if (iface)
 967                         iface->node.version = -1;
 968         }
 969
 970         return true;
 971 }
 972
 973 bool
 974 interface_add(struct interface *iface, struct blob_attr *config)
 975 {
 976         return __interface_add(iface, config, false);
 977 }
 978
 979 bool
 980 interface_add_alias(struct interface *iface, struct blob_attr *config)
 981 {
 982         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 983                 return false;
 984
 985         return __interface_add(iface, config, true);
 986 }
 987
 988 void
 989 interface_set_l3_dev(struct interface *iface, struct device *dev)
 990 {
 991         bool enabled = iface->config_ip.enabled;
 992         bool claimed = iface->l3_dev.claimed;
 993
 994         if (iface->l3_dev.dev == dev)
 995                 return;
 996
 997         interface_ip_set_enabled(&iface->config_ip, false);
 998         interface_ip_set_enabled(&iface->proto_ip, false);
 999         interface_ip_flush(&iface->proto_ip);
1000         device_add_user(&iface->l3_dev, dev);
1001
1002         if (dev) {
1003                 if (claimed) {
1004                         if (device_claim(&iface->l3_dev) < 0)
1005                                 return;
1006                 }
1007                 interface_ip_set_enabled(&iface->config_ip, enabled);
1008                 interface_ip_set_enabled(&iface->proto_ip, enabled);
1009         }
1010 }
1011
1012 static void
1013 interface_set_main_dev(struct interface *iface, struct device *dev)
1014 {
1015         bool claimed = iface->l3_dev.claimed;
1016
1017         if (iface->main_dev.dev == dev)
1018                 return;
1019
1020         interface_set_available(iface, false);
1021         device_add_user(&iface->main_dev, dev);
1022         if (!dev) {
1023                 interface_set_link_state(iface, false);
1024                 return;
1025         }
1026
1027         if (claimed) {
1028                 if (device_claim(&iface->l3_dev) < 0)
1029                         return;
1030         }
1031
1032         if (!iface->l3_dev.dev)
1033                 interface_set_l3_dev(iface, dev);
1034 }
1035
1036 static int
1037 interface_remove_link(struct interface *iface, struct device *dev,
1038                       struct blob_attr *vlan)
1039 {
1040         struct device *mdev = iface->main_dev.dev;
1041
1042         if (mdev && mdev->hotplug_ops)
1043                 return mdev->hotplug_ops->del(mdev, dev, vlan);
1044
1045         if (dev == iface->ext_dev.dev)
1046                 device_remove_user(&iface->ext_dev);
1047
1048         if (!iface->main_dev.hotplug)
1049                 return UBUS_STATUS_INVALID_ARGUMENT;
1050
1051         if (dev != iface->main_dev.dev)
1052                 return UBUS_STATUS_INVALID_ARGUMENT;
1053
1054         interface_set_main_dev(iface, NULL);
1055         return 0;
1056 }
1057
1058 static int
1059 interface_add_link(struct interface *iface, struct device *dev,
1060                    struct blob_attr *vlan, bool link_ext)
1061 {
1062         struct device *mdev = iface->main_dev.dev;
1063
1064         if (mdev == dev)
1065                 return 0;
1066
1067         if (iface->main_dev.hotplug)
1068                 device_remove_user(&iface->main_dev);
1069
1070         if (mdev) {
1071                 if (mdev->hotplug_ops)
1072                         return mdev->hotplug_ops->add(mdev, dev, vlan);
1073                 else
1074                         return UBUS_STATUS_NOT_SUPPORTED;
1075         }
1076
1077         if (link_ext)
1078                 device_add_user(&iface->ext_dev, dev);
1079
1080         interface_set_main_dev(iface, dev);
1081         iface->main_dev.hotplug = true;
1082         return 0;
1083 }
1084
1085 int
1086 interface_handle_link(struct interface *iface, const char *name,
1087                       struct blob_attr *vlan, bool add, bool link_ext)
1088 {
1089         struct device *dev;
1090         int ret;
1091
1092         device_lock();
1093
1094         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1095         if (!dev) {
1096                 ret = UBUS_STATUS_NOT_FOUND;
1097                 goto out;
1098         }
1099
1100         if (add) {
1101                 interface_set_device_config(iface, dev);
1102                 if (!link_ext)
1103                         device_set_present(dev, true);
1104
1105                 ret = interface_add_link(iface, dev, vlan, link_ext);
1106         } else {
1107                 ret = interface_remove_link(iface, dev, vlan);
1108         }
1109
1110 out:
1111         device_unlock();
1112
1113         return ret;
1114 }
1115
1116 void
1117 interface_set_up(struct interface *iface)
1118 {
1119         int ret;
1120         const char *error = NULL;
1121
1122         iface->autostart = true;
1123
1124         if (iface->state != IFS_DOWN)
1125                 return;
1126
1127         interface_clear_errors(iface);
1128         if (iface->available) {
1129                 if (iface->main_dev.dev) {
1130                         ret = device_claim(&iface->main_dev);
1131                         if (!ret)
1132                                 interface_check_state(iface);
1133                         else
1134                                 error = "DEVICE_CLAIM_FAILED";
1135                 } else {
1136                         ret = __interface_set_up(iface);
1137                         if (ret)
1138                                 error = "SETUP_FAILED";
1139                 }
1140         } else
1141                 error = "NO_DEVICE";
1142
1143         if (error)
1144                 interface_add_error(iface, "interface", error, NULL, 0);
1145 }
1146
1147 void
1148 interface_set_down(struct interface *iface)
1149 {
1150         if (!iface) {
1151                 vlist_for_each_element(&interfaces, iface, node)
1152                         __interface_set_down(iface, false);
1153         } else {
1154                 iface->autostart = false;
1155                 __interface_set_down(iface, false);
1156         }
1157 }
1158
1159 int
1160 interface_renew(struct interface *iface)
1161 {
1162         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1163                 return -1;
1164
1165         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1166 }
1167
1168 void
1169 interface_start_pending(void)
1170 {
1171         struct interface *iface;
1172
1173         vlist_for_each_element(&interfaces, iface, node) {
1174                 if (iface->autostart)
1175                         interface_set_up(iface);
1176         }
1177 }
1178
1179 void
1180 interface_start_jail(const char *jail, const pid_t netns_pid)
1181 {
1182         struct interface *iface;
1183         int netns_fd;
1184         int wstatus;
1185         pid_t pr = 0;
1186
1187         netns_fd = system_netns_open(netns_pid);
1188         if (netns_fd < 0)
1189                 return;
1190
1191         vlist_for_each_element(&interfaces, iface, node) {
1192                 if (!iface->jail || strcmp(iface->jail, jail))
1193                         continue;
1194
1195                 system_link_netns_move(iface->main_dev.dev, netns_fd, iface->jail_ifname);
1196         }
1197
1198         close(netns_fd);
1199
1200         pr = fork();
1201         if (pr) {
1202                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1203                 return;
1204         }
1205
1206         /* child process */
1207         netns_fd = system_netns_open(netns_pid);
1208         if (netns_fd < 0)
1209                 return;
1210
1211         system_netns_set(netns_fd);
1212         system_init();
1213         vlist_for_each_element(&interfaces, iface, node) {
1214                 if (!iface->jail || strcmp(iface->jail, jail))
1215                         continue;
1216
1217                 /*
1218                  * The interface has already been renamed and is inside target
1219                  * namespace, hence overwrite ifname with jail_ifname for
1220                  * interface_set_up().
1221                  * We are inside a fork which got it's own copy of the interfaces
1222                  * list, so we can mess with it :)
1223                  */
1224                 if (iface->jail_ifname)
1225                         iface->device = iface->jail_ifname;
1226
1227                 interface_do_reload(iface);
1228                 interface_set_up(iface);
1229         }
1230
1231         close(netns_fd);
1232         _exit(0);
1233 }
1234
1235 void
1236 interface_stop_jail(const char *jail, const pid_t netns_pid)
1237 {
1238         struct interface *iface;
1239         int netns_fd, root_netns;
1240         int wstatus;
1241         pid_t parent_pid = getpid();
1242         pid_t pr = 0;
1243         const char *orig_ifname;
1244
1245         pr = fork();
1246         if (pr) {
1247                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1248                 return;
1249         }
1250
1251         /* child process */
1252         root_netns = system_netns_open(parent_pid);
1253         if (root_netns < 0)
1254                 return;
1255
1256         netns_fd = system_netns_open(netns_pid);
1257         if (netns_fd < 0)
1258                 return;
1259
1260         system_netns_set(netns_fd);
1261         system_init();
1262         vlist_for_each_element(&interfaces, iface, node) {
1263                 if (!iface->jail || strcmp(iface->jail, jail))
1264                         continue;
1265
1266                 orig_ifname = iface->device;
1267                 if (iface->jail_ifname)
1268                         iface->device = iface->jail_ifname;
1269
1270                 interface_do_reload(iface);
1271                 interface_set_down(iface);
1272                 system_link_netns_move(iface->main_dev.dev, root_netns, orig_ifname);
1273         }
1274
1275         close(root_netns);
1276         close(netns_fd);
1277         _exit(0);
1278 }
1279
1280 static void
1281 set_config_state(struct interface *iface, enum interface_config_state s)
1282 {
1283         __set_config_state(iface, s);
1284         if (iface->state == IFS_DOWN)
1285                 interface_handle_config_change(iface);
1286         else
1287                 __interface_set_down(iface, false);
1288 }
1289
1290 void
1291 interface_update_start(struct interface *iface, const bool keep_old)
1292 {
1293         iface->updated = 0;
1294
1295         if (!keep_old)
1296                 interface_ip_update_start(&iface->proto_ip);
1297 }
1298
1299 void
1300 interface_update_complete(struct interface *iface)
1301 {
1302         interface_ip_update_complete(&iface->proto_ip);
1303 }
1304
1305 static void
1306 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1307 {
1308         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1309         vlist_simple_replace(&new->dns_search, &old->dns_search);
1310 }
1311
1312 static bool
1313 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1314 {
1315         struct blob_attr *ntb[__DEV_ATTR_MAX];
1316         struct blob_attr *otb[__DEV_ATTR_MAX];
1317         struct device *dev = if_old->main_dev.dev;
1318         unsigned long diff = 0;
1319
1320         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1321
1322         if (!dev)
1323                 return false;
1324
1325         if (if_old->device_config != if_new->device_config)
1326                 return true;
1327
1328         if (!if_new->device_config)
1329                 return false;
1330
1331         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1332                 blob_data(if_old->config), blob_len(if_old->config));
1333
1334         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1335                 blob_data(if_new->config), blob_len(if_new->config));
1336
1337         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1338         return diff;
1339 }
1340
1341 static void
1342 interface_change_config(struct interface *if_old, struct interface *if_new)
1343 {
1344         struct blob_attr *old_config = if_old->config;
1345         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1346
1347 #define FIELD_CHANGED_STR(field)                                        \
1348                 ((!!if_old->field != !!if_new->field) ||                \
1349                  (if_old->field &&                                      \
1350                   strcmp(if_old->field, if_new->field) != 0))
1351
1352         if (FIELD_CHANGED_STR(parent_ifname)) {
1353                 if (if_old->parent_iface.iface)
1354                         interface_remove_user(&if_old->parent_iface);
1355                 reload = true;
1356         }
1357
1358         if (!reload && interface_device_config_changed(if_old, if_new))
1359                 reload = true;
1360
1361         if (FIELD_CHANGED_STR(device) ||
1362             if_old->proto_handler != if_new->proto_handler)
1363                 reload = true;
1364
1365         if (!if_old->proto_handler->config_params)
1366                 D(INTERFACE, "No config parameters for interface '%s'\n",
1367                   if_old->name);
1368         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1369                                        if_old->proto_handler->config_params))
1370                 reload = true;
1371
1372 #define UPDATE(field, __var) ({                                         \
1373                 bool __changed = (if_old->field != if_new->field);      \
1374                 if_old->field = if_new->field;                          \
1375                 __var |= __changed;                                     \
1376         })
1377
1378         if_old->config = if_new->config;
1379         if (if_old->config_autostart != if_new->config_autostart) {
1380                 if (if_old->config_autostart)
1381                         reload = true;
1382
1383                 if_old->autostart = if_new->config_autostart;
1384         }
1385
1386         if_old->device_config = if_new->device_config;
1387         if_old->config_autostart = if_new->config_autostart;
1388         if (if_old->jail)
1389                 free(if_old->jail);
1390
1391         if_old->jail = if_new->jail;
1392         if (if_old->jail)
1393                 if_old->autostart = false;
1394
1395         if (if_old->jail_ifname)
1396                 free(if_old->jail_ifname);
1397
1398         if_old->jail_ifname = if_new->jail_ifname;
1399
1400         if_old->device = if_new->device;
1401         if_old->parent_ifname = if_new->parent_ifname;
1402         if_old->dynamic = if_new->dynamic;
1403         if_old->proto_handler = if_new->proto_handler;
1404         if_old->force_link = if_new->force_link;
1405         if_old->dns_metric = if_new->dns_metric;
1406
1407         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1408                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1409                 update_prefix_delegation = true;
1410         }
1411
1412         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1413         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1414
1415         UPDATE(metric, reload_ip);
1416         UPDATE(proto_ip.no_defaultroute, reload_ip);
1417         UPDATE(ip4table, reload_ip);
1418         UPDATE(ip6table, reload_ip);
1419         interface_merge_assignment_data(if_old, if_new);
1420
1421 #undef UPDATE
1422
1423         if (reload) {
1424                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1425                   if_old->name);
1426                 interface_clear_errors(if_old);
1427                 set_config_state(if_old, IFC_RELOAD);
1428                 goto out;
1429         }
1430
1431         if (reload_ip) {
1432                 bool config_ip_enabled = if_old->config_ip.enabled;
1433                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1434
1435                 interface_ip_set_enabled(&if_old->config_ip, false);
1436                 interface_ip_set_enabled(&if_old->proto_ip, false);
1437                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1438                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1439         }
1440
1441         if (update_prefix_delegation)
1442                 interface_update_prefix_delegation(&if_old->proto_ip);
1443
1444         interface_write_resolv_conf(if_old->jail);
1445         if (if_old->main_dev.dev)
1446                 interface_check_state(if_old);
1447
1448 out:
1449         if_new->config = NULL;
1450         interface_cleanup(if_new);
1451         free(old_config);
1452         free(if_new);
1453 }
1454
1455 static void
1456 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1457                  struct vlist_node *node_old)
1458 {
1459         struct interface *if_old = container_of(node_old, struct interface, node);
1460         struct interface *if_new = container_of(node_new, struct interface, node);
1461
1462         if (node_old && node_new) {
1463                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1464                 interface_change_config(if_old, if_new);
1465         } else if (node_old) {
1466                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1467                 set_config_state(if_old, IFC_REMOVE);
1468         } else if (node_new) {
1469                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1470                 interface_event(if_new, IFEV_CREATE);
1471                 proto_init_interface(if_new, if_new->config);
1472                 interface_claim_device(if_new);
1473                 netifd_ubus_add_interface(if_new);
1474         }
1475 }
1476
1477
1478 static void __init
1479 interface_init_list(void)
1480 {
1481         vlist_init(&interfaces, avl_strcmp, interface_update);
1482         interfaces.keep_old = true;
1483         interfaces.no_delete = true;
1484 }