interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <sys/types.h>
  18 #include <sys/wait.h>
  19
  20 #include "netifd.h"
  21 #include "device.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "proto.h"
  25 #include "ubus.h"
  26 #include "config.h"
  27 #include "system.h"
  28
  29 struct vlist_tree interfaces;
  30 static LIST_HEAD(iface_all_users);
  31
  32 enum {
  33         IFACE_ATTR_IFNAME,
  34         IFACE_ATTR_PROTO,
  35         IFACE_ATTR_AUTO,
  36         IFACE_ATTR_JAIL,
  37         IFACE_ATTR_JAIL_IFNAME,
  38         IFACE_ATTR_DEFAULTROUTE,
  39         IFACE_ATTR_PEERDNS,
  40         IFACE_ATTR_DNS,
  41         IFACE_ATTR_DNS_SEARCH,
  42         IFACE_ATTR_DNS_METRIC,
  43         IFACE_ATTR_METRIC,
  44         IFACE_ATTR_INTERFACE,
  45         IFACE_ATTR_IP6ASSIGN,
  46         IFACE_ATTR_IP6HINT,
  47         IFACE_ATTR_IP4TABLE,
  48         IFACE_ATTR_IP6TABLE,
  49         IFACE_ATTR_IP6CLASS,
  50         IFACE_ATTR_DELEGATE,
  51         IFACE_ATTR_IP6IFACEID,
  52         IFACE_ATTR_FORCE_LINK,
  53         IFACE_ATTR_IP6WEIGHT,
  54         IFACE_ATTR_MAX
  55 };
  56
  57 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  58         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  61         [IFACE_ATTR_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_JAIL_IFNAME] = { .name = "jail_ifname", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  65         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  66         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  67         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  68         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  71         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  75         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  78         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  79 };
  80
  81 const struct uci_blob_param_list interface_attr_list = {
  82         .n_params = IFACE_ATTR_MAX,
  83         .params = iface_attrs,
  84 };
  85
  86 static void
  87 interface_set_main_dev(struct interface *iface, struct device *dev);
  88 static void
  89 interface_event(struct interface *iface, enum interface_event ev);
  90
  91 static void
  92 interface_error_flush(struct interface *iface)
  93 {
  94         struct interface_error *error, *tmp;
  95
  96         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  97                 list_del(&error->list);
  98                 free(error);
  99         }
 100 }
 101
 102 static void
 103 interface_clear_errors(struct interface *iface)
 104 {
 105         /* don't flush the errors in case the configured protocol handler matches the
 106            running protocol handler and is having the last error capability */
 107         if (!(iface->proto &&
 108               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 109               (iface->proto->handler->name == iface->proto_handler->name)))
 110                 interface_error_flush(iface);
 111 }
 112
 113 void interface_add_error(struct interface *iface, const char *subsystem,
 114                          const char *code, const char **data, int n_data)
 115 {
 116         struct interface_error *error;
 117         int i, len = 0;
 118         int *datalen = NULL;
 119         char *dest, *d_subsys, *d_code;
 120
 121         /* if the configured protocol handler has the last error support capability,
 122            errors should only be added if the running protocol handler matches the
 123            configured one */
 124         if (iface->proto &&
 125             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 126             (iface->proto->handler->name != iface->proto_handler->name))
 127                 return;
 128
 129         if (n_data) {
 130                 len = n_data * sizeof(char *);
 131                 datalen = alloca(len);
 132                 for (i = 0; i < n_data; i++) {
 133                         datalen[i] = strlen(data[i]) + 1;
 134                         len += datalen[i];
 135                 }
 136         }
 137
 138         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 139                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 140                 &d_code, code ? strlen(code) + 1 : 0);
 141         if (!error)
 142                 return;
 143
 144         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 145            protocol can't be established (e.g auth failure) */
 146         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 147                 interface_error_flush(iface);
 148
 149         list_add_tail(&error->list, &iface->errors);
 150
 151         dest = (char *) &error->data[n_data + 1];
 152         for (i = 0; i < n_data; i++) {
 153                 error->data[i] = dest;
 154                 memcpy(dest, data[i], datalen[i]);
 155                 dest += datalen[i];
 156         }
 157         error->data[n_data] = NULL;
 158
 159         if (subsystem)
 160                 error->subsystem = strcpy(d_subsys, subsystem);
 161
 162         if (code)
 163                 error->code = strcpy(d_code, code);
 164 }
 165
 166 static void
 167 interface_data_del(struct interface *iface, struct interface_data *data)
 168 {
 169         avl_delete(&iface->data, &data->node);
 170         free(data);
 171 }
 172
 173 static void
 174 interface_data_flush(struct interface *iface)
 175 {
 176         struct interface_data *d, *tmp;
 177
 178         avl_for_each_element_safe(&iface->data, d, node, tmp)
 179                 interface_data_del(iface, d);
 180 }
 181
 182 int
 183 interface_add_data(struct interface *iface, const struct blob_attr *data)
 184 {
 185         struct interface_data *n, *o;
 186
 187         if (!blobmsg_check_attr(data, true))
 188                 return UBUS_STATUS_INVALID_ARGUMENT;
 189
 190         const char *name = blobmsg_name(data);
 191         unsigned len = blob_pad_len(data);
 192
 193         o = avl_find_element(&iface->data, name, o, node);
 194         if (o) {
 195                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 196                         return 0;
 197
 198                 interface_data_del(iface, o);
 199         }
 200
 201         n = calloc(1, sizeof(*n) + len);
 202         if (!n)
 203                 return UBUS_STATUS_UNKNOWN_ERROR;
 204
 205         memcpy(n->data, data, len);
 206         n->node.key = blobmsg_name(n->data);
 207         avl_insert(&iface->data, &n->node);
 208
 209         iface->updated |= IUF_DATA;
 210         return 0;
 211 }
 212
 213 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 214 {
 215         struct blob_attr *cur;
 216         int rem, ret;
 217
 218         iface->updated = 0;
 219
 220         blob_for_each_attr(cur, attr, rem) {
 221                 ret = interface_add_data(iface, cur);
 222                 if (ret)
 223                         return ret;
 224         }
 225
 226         if (iface->updated && iface->state == IFS_UP)
 227                 interface_event(iface, IFEV_UPDATE);
 228
 229         return 0;
 230 }
 231
 232 static void
 233 interface_event(struct interface *iface, enum interface_event ev)
 234 {
 235         struct interface_user *dep, *tmp;
 236         struct device *adev = NULL;
 237
 238         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 239                 dep->cb(dep, iface, ev);
 240
 241         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 242                 dep->cb(dep, iface, ev);
 243
 244         switch (ev) {
 245         case IFEV_UP:
 246                 interface_error_flush(iface);
 247                 adev = iface->l3_dev.dev;
 248                 fallthrough;
 249         case IFEV_DOWN:
 250         case IFEV_UP_FAILED:
 251                 alias_notify_device(iface->name, adev);
 252                 break;
 253         default:
 254                 break;
 255         }
 256 }
 257
 258 static void
 259 interface_flush_state(struct interface *iface)
 260 {
 261         if (iface->l3_dev.dev)
 262                 device_release(&iface->l3_dev);
 263         interface_data_flush(iface);
 264 }
 265
 266 static void
 267 mark_interface_down(struct interface *iface)
 268 {
 269         enum interface_state state = iface->state;
 270
 271         if (state == IFS_DOWN)
 272                 return;
 273
 274         iface->link_up_event = false;
 275         iface->state = IFS_DOWN;
 276         switch (state) {
 277         case IFS_UP:
 278         case IFS_TEARDOWN:
 279                 interface_event(iface, IFEV_DOWN);
 280                 break;
 281         case IFS_SETUP:
 282                 interface_event(iface, IFEV_UP_FAILED);
 283                 break;
 284         default:
 285                 break;
 286         }
 287         interface_ip_set_enabled(&iface->config_ip, false);
 288         interface_ip_set_enabled(&iface->proto_ip, false);
 289         interface_ip_flush(&iface->proto_ip);
 290         interface_flush_state(iface);
 291         system_flush_routes();
 292 }
 293
 294 static inline void
 295 __set_config_state(struct interface *iface, enum interface_config_state s)
 296 {
 297         iface->config_state = s;
 298 }
 299
 300 static void
 301 __interface_set_down(struct interface *iface, bool force)
 302 {
 303         enum interface_state state = iface->state;
 304         switch (state) {
 305         case IFS_UP:
 306         case IFS_SETUP:
 307                 iface->state = IFS_TEARDOWN;
 308                 if (iface->dynamic)
 309                         __set_config_state(iface, IFC_REMOVE);
 310
 311                 if (state == IFS_UP)
 312                         interface_event(iface, IFEV_DOWN);
 313
 314                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 315                 if (force)
 316                         interface_flush_state(iface);
 317                 break;
 318
 319         case IFS_DOWN:
 320                 if (iface->main_dev.dev)
 321                         device_release(&iface->main_dev);
 322                 break;
 323         case IFS_TEARDOWN:
 324         default:
 325                 break;
 326         }
 327 }
 328
 329 static int
 330 __interface_set_up(struct interface *iface)
 331 {
 332         int ret;
 333
 334         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 335
 336         iface->state = IFS_SETUP;
 337         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 338         if (ret)
 339                 mark_interface_down(iface);
 340
 341         return ret;
 342 }
 343
 344 static void
 345 interface_check_state(struct interface *iface)
 346 {
 347         bool link_state = iface->link_state || iface->force_link;
 348
 349         switch (iface->state) {
 350         case IFS_UP:
 351         case IFS_SETUP:
 352                 if (!iface->enabled || !link_state) {
 353                         iface->state = IFS_TEARDOWN;
 354                         if (iface->dynamic)
 355                                 __set_config_state(iface, IFC_REMOVE);
 356
 357                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 358                 }
 359                 break;
 360         case IFS_DOWN:
 361                 if (!iface->available)
 362                         return;
 363
 364                 if (iface->autostart && iface->enabled && link_state && !config_init)
 365                         __interface_set_up(iface);
 366                 break;
 367         default:
 368                 break;
 369         }
 370 }
 371
 372 static void
 373 interface_set_enabled(struct interface *iface, bool new_state)
 374 {
 375         if (iface->enabled == new_state)
 376                 return;
 377
 378         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 379         iface->enabled = new_state;
 380         interface_check_state(iface);
 381 }
 382
 383 static void
 384 interface_set_link_state(struct interface *iface, bool new_state)
 385 {
 386         if (iface->link_state == new_state)
 387                 return;
 388
 389         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 390         iface->link_state = new_state;
 391         interface_check_state(iface);
 392
 393         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 394                 interface_event(iface, IFEV_LINK_UP);
 395                 iface->link_up_event = true;
 396         }
 397 }
 398
 399 static void
 400 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 401 {
 402         if (ev == DEV_EVENT_REMOVE)
 403                 device_remove_user(dep);
 404 }
 405
 406 static void
 407 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 408 {
 409         struct interface *iface;
 410
 411         iface = container_of(dep, struct interface, main_dev);
 412         switch (ev) {
 413         case DEV_EVENT_ADD:
 414                 interface_set_available(iface, true);
 415                 break;
 416         case DEV_EVENT_REMOVE:
 417                 interface_set_available(iface, false);
 418                 if (dep->dev && dep->dev->external)
 419                         interface_set_main_dev(iface, NULL);
 420                 break;
 421         case DEV_EVENT_UP:
 422                 interface_set_enabled(iface, true);
 423                 break;
 424         case DEV_EVENT_DOWN:
 425                 interface_set_enabled(iface, false);
 426                 break;
 427         case DEV_EVENT_LINK_UP:
 428                 interface_set_link_state(iface, true);
 429                 break;
 430         case DEV_EVENT_LINK_DOWN:
 431                 interface_set_link_state(iface, false);
 432                 break;
 433         case DEV_EVENT_TOPO_CHANGE:
 434                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 435                 return;
 436         default:
 437                 break;
 438         }
 439 }
 440
 441 static void
 442 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 443 {
 444         struct interface *iface;
 445
 446         iface = container_of(dep, struct interface, l3_dev);
 447         if (iface->l3_dev.dev == iface->main_dev.dev)
 448                 return;
 449
 450         switch (ev) {
 451         case DEV_EVENT_LINK_DOWN:
 452                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 453                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 454                 break;
 455         default:
 456                 break;
 457         }
 458 }
 459
 460 void
 461 interface_set_available(struct interface *iface, bool new_state)
 462 {
 463         if (iface->available == new_state)
 464                 return;
 465
 466         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 467         iface->available = new_state;
 468
 469         if (new_state) {
 470                 if (iface->autostart && !config_init)
 471                         interface_set_up(iface);
 472         } else
 473                 __interface_set_down(iface, true);
 474 }
 475
 476 void
 477 interface_add_user(struct interface_user *dep, struct interface *iface)
 478 {
 479         if (!iface) {
 480                 list_add(&dep->list, &iface_all_users);
 481                 return;
 482         }
 483
 484         dep->iface = iface;
 485         list_add(&dep->list, &iface->users);
 486         if (iface->state == IFS_UP)
 487                 dep->cb(dep, iface, IFEV_UP);
 488 }
 489
 490 void
 491 interface_remove_user(struct interface_user *dep)
 492 {
 493         list_del_init(&dep->list);
 494         dep->iface = NULL;
 495 }
 496
 497 static void
 498 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 499 {
 500         struct blob_attr *cur;
 501         int rem;
 502
 503         blobmsg_for_each_attr(cur, list, rem) {
 504                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 505                         continue;
 506
 507                 if (!blobmsg_check_attr(cur, false))
 508                         continue;
 509
 510                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 511                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 512                 list_add(&c->head, &iface->assignment_classes);
 513         }
 514 }
 515
 516 static void
 517 interface_clear_assignment_classes(struct interface *iface)
 518 {
 519         while (!list_empty(&iface->assignment_classes)) {
 520                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 521                                 struct interface_assignment_class, head);
 522                 list_del(&c->head);
 523                 free(c);
 524         }
 525 }
 526
 527 static void
 528 interface_merge_assignment_data(struct interface *old, struct interface *new)
 529 {
 530         bool changed = (old->assignment_hint != new->assignment_hint ||
 531                         old->assignment_length != new->assignment_length ||
 532                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 533                         old->assignment_weight != new->assignment_weight ||
 534                         (old->assignment_iface_id_selection == IFID_FIXED &&
 535                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 536                                 sizeof(old->assignment_fixed_iface_id))) ||
 537                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 538
 539         struct interface_assignment_class *c;
 540         list_for_each_entry(c, &new->assignment_classes, head) {
 541                 /* Compare list entries one-by-one to see if there was a change */
 542                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 543                         changed = true;
 544
 545                 if (changed)
 546                         break;
 547
 548                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 549                                 struct interface_assignment_class, head);
 550
 551                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 552                         break;
 553
 554                 list_del(&c_old->head);
 555                 free(c_old);
 556         }
 557
 558         /* The old list was longer than the new one or the last entry didn't match */
 559         if (!list_empty(&old->assignment_classes)) {
 560                 interface_clear_assignment_classes(old);
 561                 changed = true;
 562         }
 563
 564         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 565
 566         if (changed) {
 567                 old->assignment_hint = new->assignment_hint;
 568                 old->assignment_length = new->assignment_length;
 569                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 570                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 571                 old->assignment_weight = new->assignment_weight;
 572                 interface_refresh_assignments(true);
 573         }
 574 }
 575
 576 static void
 577 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 578 {
 579         struct interface *alias = container_of(dep, struct interface, parent_iface);
 580         struct device *dev = iface->l3_dev.dev;
 581
 582         switch (ev) {
 583         case IFEV_UP:
 584                 if (!dev)
 585                         return;
 586
 587                 interface_set_main_dev(alias, dev);
 588                 interface_set_available(alias, true);
 589                 break;
 590         case IFEV_DOWN:
 591         case IFEV_UP_FAILED:
 592                 interface_set_available(alias, false);
 593                 interface_set_main_dev(alias, NULL);
 594                 break;
 595         case IFEV_FREE:
 596                 interface_remove_user(dep);
 597                 break;
 598         default:
 599                 break;
 600         }
 601 }
 602
 603 static void
 604 interface_set_device_config(struct interface *iface, struct device *dev)
 605 {
 606         if (!dev || !dev->default_config)
 607                 return;
 608
 609         if (!iface->device_config &&
 610             (!dev->iface_config || dev->config_iface != iface))
 611                 return;
 612
 613         dev->config_iface = iface;
 614         dev->iface_config = iface->device_config;
 615         device_apply_config(dev, dev->type, iface->config);
 616 }
 617
 618 static void
 619 interface_claim_device(struct interface *iface)
 620 {
 621         struct interface *parent;
 622         struct device *dev = NULL;
 623
 624         if (iface->parent_iface.iface)
 625                 interface_remove_user(&iface->parent_iface);
 626
 627         device_lock();
 628
 629         if (iface->parent_ifname) {
 630                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 631                 iface->parent_iface.cb = interface_alias_cb;
 632                 interface_add_user(&iface->parent_iface, parent);
 633         } else if (iface->ifname &&
 634                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 635                 dev = device_get(iface->ifname, true);
 636                 interface_set_device_config(iface, dev);
 637         } else {
 638                 dev = iface->ext_dev.dev;
 639         }
 640
 641         if (dev)
 642                 interface_set_main_dev(iface, dev);
 643
 644         device_unlock();
 645
 646         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 647                 interface_set_available(iface, true);
 648 }
 649
 650 static void
 651 interface_cleanup_state(struct interface *iface)
 652 {
 653         interface_set_available(iface, false);
 654
 655         interface_flush_state(iface);
 656         interface_clear_errors(iface);
 657         interface_set_proto_state(iface, NULL);
 658
 659         interface_set_main_dev(iface, NULL);
 660         interface_set_l3_dev(iface, NULL);
 661 }
 662
 663 static void
 664 interface_cleanup(struct interface *iface)
 665 {
 666         struct interface_user *dep, *tmp;
 667
 668         uloop_timeout_cancel(&iface->remove_timer);
 669         device_remove_user(&iface->ext_dev);
 670
 671         if (iface->parent_iface.iface)
 672                 interface_remove_user(&iface->parent_iface);
 673
 674         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 675                 interface_remove_user(dep);
 676
 677         interface_clear_assignment_classes(iface);
 678         interface_ip_flush(&iface->config_ip);
 679         interface_cleanup_state(iface);
 680 }
 681
 682 static void
 683 interface_do_free(struct interface *iface)
 684 {
 685         interface_event(iface, IFEV_FREE);
 686         interface_cleanup(iface);
 687         free(iface->config);
 688         netifd_ubus_remove_interface(iface);
 689         avl_delete(&interfaces.avl, &iface->node.avl);
 690         if (iface->jail)
 691                 free(iface->jail);
 692         if (iface->jail_ifname)
 693                 free(iface->jail_ifname);
 694
 695         free(iface);
 696 }
 697
 698 static void
 699 interface_do_reload(struct interface *iface)
 700 {
 701         interface_event(iface, IFEV_RELOAD);
 702         interface_cleanup_state(iface);
 703         proto_init_interface(iface, iface->config);
 704         interface_claim_device(iface);
 705 }
 706
 707 static void
 708 interface_handle_config_change(struct interface *iface)
 709 {
 710         enum interface_config_state state = iface->config_state;
 711
 712         iface->config_state = IFC_NORMAL;
 713         switch(state) {
 714         case IFC_NORMAL:
 715                 break;
 716         case IFC_RELOAD:
 717                 interface_do_reload(iface);
 718                 break;
 719         case IFC_REMOVE:
 720                 interface_do_free(iface);
 721                 return;
 722         }
 723         if (iface->autostart)
 724                 interface_set_up(iface);
 725 }
 726
 727 static void
 728 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 729 {
 730         struct interface *iface = state->iface;
 731
 732         switch (ev) {
 733         case IFPEV_UP:
 734                 if (iface->state != IFS_SETUP) {
 735                         if (iface->state == IFS_UP && iface->updated)
 736                                 interface_event(iface, IFEV_UPDATE);
 737                         return;
 738                 }
 739
 740                 if (!iface->l3_dev.dev)
 741                         interface_set_l3_dev(iface, iface->main_dev.dev);
 742
 743                 interface_ip_set_enabled(&iface->config_ip, true);
 744                 interface_ip_set_enabled(&iface->proto_ip, true);
 745                 system_flush_routes();
 746                 iface->state = IFS_UP;
 747                 iface->start_time = system_get_rtime();
 748                 interface_event(iface, IFEV_UP);
 749                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 750                 break;
 751         case IFPEV_DOWN:
 752                 if (iface->state == IFS_DOWN)
 753                         return;
 754
 755                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 756                 mark_interface_down(iface);
 757                 if (iface->main_dev.dev)
 758                         device_release(&iface->main_dev);
 759                 if (iface->l3_dev.dev)
 760                         device_remove_user(&iface->l3_dev);
 761                 interface_handle_config_change(iface);
 762                 break;
 763         case IFPEV_LINK_LOST:
 764                 if (iface->state != IFS_UP)
 765                         return;
 766
 767                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 768                 mark_interface_down(iface);
 769                 iface->state = IFS_SETUP;
 770                 break;
 771         default:
 772                 return;
 773         }
 774
 775         interface_write_resolv_conf(iface->jail);
 776 }
 777
 778 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 779 {
 780         if (iface->proto) {
 781                 iface->proto->free(iface->proto);
 782                 iface->proto = NULL;
 783         }
 784         iface->state = IFS_DOWN;
 785         iface->proto = state;
 786         if (!state)
 787                 return;
 788
 789         state->proto_event = interface_proto_event_cb;
 790         state->iface = iface;
 791 }
 792
 793 struct interface *
 794 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 795 {
 796         struct interface *iface;
 797         struct blob_attr *tb[IFACE_ATTR_MAX];
 798         struct blob_attr *cur;
 799         const char *proto_name = NULL;
 800         char *iface_name;
 801         bool force_link = false;
 802
 803         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 804         iface->name = strcpy(iface_name, name);
 805         INIT_LIST_HEAD(&iface->errors);
 806         INIT_LIST_HEAD(&iface->users);
 807         INIT_LIST_HEAD(&iface->hotplug_list);
 808         INIT_LIST_HEAD(&iface->assignment_classes);
 809         interface_ip_init(iface);
 810         avl_init(&iface->data, avl_strcmp, false, NULL);
 811         iface->config_ip.enabled = false;
 812
 813         iface->main_dev.cb = interface_main_dev_cb;
 814         iface->l3_dev.cb = interface_l3_dev_cb;
 815         iface->ext_dev.cb = interface_ext_dev_cb;
 816
 817         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 818                       blob_data(config), blob_len(config));
 819
 820         if ((cur = tb[IFACE_ATTR_PROTO]))
 821                 proto_name = blobmsg_data(cur);
 822
 823         proto_attach_interface(iface, proto_name);
 824         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 825                 force_link = true;
 826
 827         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 828         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 829         iface->dynamic = dynamic;
 830         iface->proto_ip.no_defaultroute =
 831                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 832         iface->proto_ip.no_dns =
 833                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 834
 835         if ((cur = tb[IFACE_ATTR_DNS]))
 836                 interface_add_dns_server_list(&iface->config_ip, cur);
 837
 838         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 839                 interface_add_dns_search_list(&iface->config_ip, cur);
 840
 841         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 842                 iface->dns_metric = blobmsg_get_u32(cur);
 843
 844         if ((cur = tb[IFACE_ATTR_METRIC]))
 845                 iface->metric = blobmsg_get_u32(cur);
 846
 847         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 848                 iface->assignment_length = blobmsg_get_u32(cur);
 849
 850         /* defaults */
 851         iface->assignment_iface_id_selection = IFID_FIXED;
 852         iface->assignment_fixed_iface_id = in6addr_any;
 853         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 854
 855         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 856                 const char *ifaceid = blobmsg_data(cur);
 857                 if (!strcmp(ifaceid, "random")) {
 858                         iface->assignment_iface_id_selection = IFID_RANDOM;
 859                 }
 860                 else if (!strcmp(ifaceid, "eui64")) {
 861                         iface->assignment_iface_id_selection = IFID_EUI64;
 862                 }
 863                 else {
 864                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 865                            if we cannot parse -> revert to iface id 1 */
 866                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 867                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 868                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 869                                 iface->assignment_fixed_iface_id = in6addr_any;
 870                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 871                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 872                                                         falling back to iface id 1.\n", iface->name);
 873                         }
 874                 }
 875         }
 876
 877         iface->assignment_hint = -1;
 878         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 879                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 880                                 ~((1 << (64 - iface->assignment_length)) - 1);
 881
 882         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 883                 interface_add_assignment_classes(iface, cur);
 884
 885         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 886                 iface->assignment_weight = blobmsg_get_u32(cur);
 887
 888         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 889                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 890                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 891         }
 892
 893         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 894                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 895                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 896         }
 897
 898         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 899
 900         iface->config_autostart = iface->autostart;
 901         iface->jail = NULL;
 902
 903         if ((cur = tb[IFACE_ATTR_JAIL])) {
 904                 iface->jail = strdup(blobmsg_get_string(cur));
 905                 iface->autostart = false;
 906         }
 907
 908         iface->jail_ifname = NULL;
 909         if ((cur = tb[IFACE_ATTR_JAIL_IFNAME]))
 910                 iface->jail_ifname = strdup(blobmsg_get_string(cur));
 911
 912         return iface;
 913 }
 914
 915 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 916 {
 917         struct blob_attr *tb[IFACE_ATTR_MAX];
 918         struct blob_attr *cur;
 919         char *name = NULL;
 920
 921         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 922                       blob_data(config), blob_len(config));
 923
 924         if (alias) {
 925                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 926                         iface->parent_ifname = blobmsg_data(cur);
 927
 928                 if (!iface->parent_ifname)
 929                         return false;
 930         } else {
 931                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 932                         iface->ifname = blobmsg_data(cur);
 933         }
 934
 935         if (iface->dynamic) {
 936                 name = strdup(iface->name);
 937
 938                 if (!name)
 939                         return false;
 940         }
 941
 942         iface->config = config;
 943         vlist_add(&interfaces, &iface->node, iface->name);
 944
 945         if (name) {
 946                 iface = vlist_find(&interfaces, name, iface, node);
 947                 free(name);
 948
 949                 /* Don't delete dynamic interface on reload */
 950                 if (iface)
 951                         iface->node.version = -1;
 952         }
 953
 954         return true;
 955 }
 956
 957 bool
 958 interface_add(struct interface *iface, struct blob_attr *config)
 959 {
 960         return __interface_add(iface, config, false);
 961 }
 962
 963 bool
 964 interface_add_alias(struct interface *iface, struct blob_attr *config)
 965 {
 966         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 967                 return false;
 968
 969         return __interface_add(iface, config, true);
 970 }
 971
 972 void
 973 interface_set_l3_dev(struct interface *iface, struct device *dev)
 974 {
 975         bool enabled = iface->config_ip.enabled;
 976         bool claimed = iface->l3_dev.claimed;
 977
 978         if (iface->l3_dev.dev == dev)
 979                 return;
 980
 981         interface_ip_set_enabled(&iface->config_ip, false);
 982         interface_ip_set_enabled(&iface->proto_ip, false);
 983         interface_ip_flush(&iface->proto_ip);
 984         device_add_user(&iface->l3_dev, dev);
 985
 986         if (dev) {
 987                 if (claimed) {
 988                         if (device_claim(&iface->l3_dev) < 0)
 989                                 return;
 990                 }
 991                 interface_ip_set_enabled(&iface->config_ip, enabled);
 992                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 993         }
 994 }
 995
 996 static void
 997 interface_set_main_dev(struct interface *iface, struct device *dev)
 998 {
 999         bool claimed = iface->l3_dev.claimed;
1000
1001         if (iface->main_dev.dev == dev)
1002                 return;
1003
1004         interface_set_available(iface, false);
1005         device_add_user(&iface->main_dev, dev);
1006         if (!dev) {
1007                 interface_set_link_state(iface, false);
1008                 return;
1009         }
1010
1011         if (claimed) {
1012                 if (device_claim(&iface->l3_dev) < 0)
1013                         return;
1014         }
1015
1016         if (!iface->l3_dev.dev)
1017                 interface_set_l3_dev(iface, dev);
1018 }
1019
1020 static int
1021 interface_remove_link(struct interface *iface, struct device *dev)
1022 {
1023         struct device *mdev = iface->main_dev.dev;
1024
1025         if (mdev && mdev->hotplug_ops)
1026                 return mdev->hotplug_ops->del(mdev, dev);
1027
1028         if (dev == iface->ext_dev.dev)
1029                 device_remove_user(&iface->ext_dev);
1030
1031         if (!iface->main_dev.hotplug)
1032                 return UBUS_STATUS_INVALID_ARGUMENT;
1033
1034         if (dev != iface->main_dev.dev)
1035                 return UBUS_STATUS_INVALID_ARGUMENT;
1036
1037         interface_set_main_dev(iface, NULL);
1038         return 0;
1039 }
1040
1041 static int
1042 interface_add_link(struct interface *iface, struct device *dev,
1043                    struct blob_attr *vlan, bool link_ext)
1044 {
1045         struct device *mdev = iface->main_dev.dev;
1046
1047         if (mdev == dev)
1048                 return 0;
1049
1050         if (iface->main_dev.hotplug)
1051                 device_remove_user(&iface->main_dev);
1052
1053         if (mdev) {
1054                 if (mdev->hotplug_ops)
1055                         return mdev->hotplug_ops->add(mdev, dev, vlan);
1056                 else
1057                         return UBUS_STATUS_NOT_SUPPORTED;
1058         }
1059
1060         if (link_ext)
1061                 device_add_user(&iface->ext_dev, dev);
1062
1063         interface_set_main_dev(iface, dev);
1064         iface->main_dev.hotplug = true;
1065         return 0;
1066 }
1067
1068 int
1069 interface_handle_link(struct interface *iface, const char *name,
1070                       struct blob_attr *vlan, bool add, bool link_ext)
1071 {
1072         struct device *dev;
1073         int ret;
1074
1075         device_lock();
1076
1077         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1078         if (!dev) {
1079                 ret = UBUS_STATUS_NOT_FOUND;
1080                 goto out;
1081         }
1082
1083         if (add) {
1084                 interface_set_device_config(iface, dev);
1085                 if (!link_ext)
1086                         device_set_present(dev, true);
1087
1088                 ret = interface_add_link(iface, dev, vlan, link_ext);
1089         } else {
1090                 ret = interface_remove_link(iface, dev);
1091         }
1092
1093 out:
1094         device_unlock();
1095
1096         return ret;
1097 }
1098
1099 void
1100 interface_set_up(struct interface *iface)
1101 {
1102         int ret;
1103         const char *error = NULL;
1104
1105         iface->autostart = true;
1106
1107         if (iface->state != IFS_DOWN)
1108                 return;
1109
1110         interface_clear_errors(iface);
1111         if (iface->available) {
1112                 if (iface->main_dev.dev) {
1113                         ret = device_claim(&iface->main_dev);
1114                         if (!ret)
1115                                 interface_check_state(iface);
1116                         else
1117                                 error = "DEVICE_CLAIM_FAILED";
1118                 } else {
1119                         ret = __interface_set_up(iface);
1120                         if (ret)
1121                                 error = "SETUP_FAILED";
1122                 }
1123         } else
1124                 error = "NO_DEVICE";
1125
1126         if (error)
1127                 interface_add_error(iface, "interface", error, NULL, 0);
1128 }
1129
1130 void
1131 interface_set_down(struct interface *iface)
1132 {
1133         if (!iface) {
1134                 vlist_for_each_element(&interfaces, iface, node)
1135                         __interface_set_down(iface, false);
1136         } else {
1137                 iface->autostart = false;
1138                 __interface_set_down(iface, false);
1139         }
1140 }
1141
1142 int
1143 interface_renew(struct interface *iface)
1144 {
1145         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1146                 return -1;
1147
1148         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1149 }
1150
1151 void
1152 interface_start_pending(void)
1153 {
1154         struct interface *iface;
1155
1156         vlist_for_each_element(&interfaces, iface, node) {
1157                 if (iface->autostart)
1158                         interface_set_up(iface);
1159         }
1160 }
1161
1162 void
1163 interface_start_jail(const char *jail, const pid_t netns_pid)
1164 {
1165         struct interface *iface;
1166         int netns_fd;
1167         int wstatus;
1168         pid_t pr = 0;
1169
1170         netns_fd = system_netns_open(netns_pid);
1171         if (netns_fd < 0)
1172                 return;
1173
1174         vlist_for_each_element(&interfaces, iface, node) {
1175                 if (!iface->jail || strcmp(iface->jail, jail))
1176                         continue;
1177
1178                 system_link_netns_move(iface->main_dev.dev, netns_fd, iface->jail_ifname);
1179         }
1180
1181         close(netns_fd);
1182
1183         pr = fork();
1184         if (pr) {
1185                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1186                 return;
1187         }
1188
1189         /* child process */
1190         netns_fd = system_netns_open(netns_pid);
1191         if (netns_fd < 0)
1192                 return;
1193
1194         system_netns_set(netns_fd);
1195         system_init();
1196         vlist_for_each_element(&interfaces, iface, node) {
1197                 if (!iface->jail || strcmp(iface->jail, jail))
1198                         continue;
1199
1200                 /*
1201                  * The interface has already been renamed and is inside target
1202                  * namespace, hence overwrite ifname with jail_ifname for
1203                  * interface_set_up().
1204                  * We are inside a fork which got it's own copy of the interfaces
1205                  * list, so we can mess with it :)
1206                  */
1207                 if (iface->jail_ifname)
1208                         iface->ifname = iface->jail_ifname;
1209
1210                 interface_do_reload(iface);
1211                 interface_set_up(iface);
1212         }
1213
1214         close(netns_fd);
1215         _exit(0);
1216 }
1217
1218 void
1219 interface_stop_jail(const char *jail, const pid_t netns_pid)
1220 {
1221         struct interface *iface;
1222         int netns_fd, root_netns;
1223         int wstatus;
1224         pid_t parent_pid = getpid();
1225         pid_t pr = 0;
1226         const char *orig_ifname;
1227
1228         pr = fork();
1229         if (pr) {
1230                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1231                 return;
1232         }
1233
1234         /* child process */
1235         root_netns = system_netns_open(parent_pid);
1236         if (root_netns < 0)
1237                 return;
1238
1239         netns_fd = system_netns_open(netns_pid);
1240         if (netns_fd < 0)
1241                 return;
1242
1243         system_netns_set(netns_fd);
1244         system_init();
1245         vlist_for_each_element(&interfaces, iface, node) {
1246                 if (!iface->jail || strcmp(iface->jail, jail))
1247                         continue;
1248
1249                 orig_ifname = iface->ifname;
1250                 if (iface->jail_ifname)
1251                         iface->ifname = iface->jail_ifname;
1252
1253                 interface_do_reload(iface);
1254                 interface_set_down(iface);
1255                 system_link_netns_move(iface->main_dev.dev, root_netns, orig_ifname);
1256         }
1257
1258         close(root_netns);
1259         close(netns_fd);
1260         _exit(0);
1261 }
1262
1263 static void
1264 set_config_state(struct interface *iface, enum interface_config_state s)
1265 {
1266         __set_config_state(iface, s);
1267         if (iface->state == IFS_DOWN)
1268                 interface_handle_config_change(iface);
1269         else
1270                 __interface_set_down(iface, false);
1271 }
1272
1273 void
1274 interface_update_start(struct interface *iface, const bool keep_old)
1275 {
1276         iface->updated = 0;
1277
1278         if (!keep_old)
1279                 interface_ip_update_start(&iface->proto_ip);
1280 }
1281
1282 void
1283 interface_update_complete(struct interface *iface)
1284 {
1285         interface_ip_update_complete(&iface->proto_ip);
1286 }
1287
1288 static void
1289 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1290 {
1291         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1292         vlist_simple_replace(&new->dns_search, &old->dns_search);
1293 }
1294
1295 static bool
1296 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1297 {
1298         struct blob_attr *ntb[__DEV_ATTR_MAX];
1299         struct blob_attr *otb[__DEV_ATTR_MAX];
1300         struct device *dev = if_old->main_dev.dev;
1301         unsigned long diff = 0;
1302
1303         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1304
1305         if (!dev)
1306                 return false;
1307
1308         if (if_old->device_config != if_new->device_config)
1309                 return true;
1310
1311         if (!if_new->device_config)
1312                 return false;
1313
1314         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1315                 blob_data(if_old->config), blob_len(if_old->config));
1316
1317         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1318                 blob_data(if_new->config), blob_len(if_new->config));
1319
1320         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1321         return diff;
1322 }
1323
1324 static void
1325 interface_change_config(struct interface *if_old, struct interface *if_new)
1326 {
1327         struct blob_attr *old_config = if_old->config;
1328         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1329
1330 #define FIELD_CHANGED_STR(field)                                        \
1331                 ((!!if_old->field != !!if_new->field) ||                \
1332                  (if_old->field &&                                      \
1333                   strcmp(if_old->field, if_new->field) != 0))
1334
1335         if (FIELD_CHANGED_STR(parent_ifname)) {
1336                 if (if_old->parent_iface.iface)
1337                         interface_remove_user(&if_old->parent_iface);
1338                 reload = true;
1339         }
1340
1341         if (!reload && interface_device_config_changed(if_old, if_new))
1342                 reload = true;
1343
1344         if (FIELD_CHANGED_STR(ifname) ||
1345             if_old->proto_handler != if_new->proto_handler)
1346                 reload = true;
1347
1348         if (!if_old->proto_handler->config_params)
1349                 D(INTERFACE, "No config parameters for interface '%s'\n",
1350                   if_old->name);
1351         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1352                                        if_old->proto_handler->config_params))
1353                 reload = true;
1354
1355 #define UPDATE(field, __var) ({                                         \
1356                 bool __changed = (if_old->field != if_new->field);      \
1357                 if_old->field = if_new->field;                          \
1358                 __var |= __changed;                                     \
1359         })
1360
1361         if_old->config = if_new->config;
1362         if (if_old->config_autostart != if_new->config_autostart) {
1363                 if (if_old->config_autostart)
1364                         reload = true;
1365
1366                 if_old->autostart = if_new->config_autostart;
1367         }
1368
1369         if_old->device_config = if_new->device_config;
1370         if_old->config_autostart = if_new->config_autostart;
1371         if (if_old->jail)
1372                 free(if_old->jail);
1373
1374         if_old->jail = if_new->jail;
1375         if (if_old->jail)
1376                 if_old->autostart = false;
1377
1378         if (if_old->jail_ifname)
1379                 free(if_old->jail_ifname);
1380
1381         if_old->jail_ifname = if_new->jail_ifname;
1382
1383         if_old->ifname = if_new->ifname;
1384         if_old->parent_ifname = if_new->parent_ifname;
1385         if_old->dynamic = if_new->dynamic;
1386         if_old->proto_handler = if_new->proto_handler;
1387         if_old->force_link = if_new->force_link;
1388         if_old->dns_metric = if_new->dns_metric;
1389
1390         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1391                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1392                 update_prefix_delegation = true;
1393         }
1394
1395         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1396         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1397
1398         UPDATE(metric, reload_ip);
1399         UPDATE(proto_ip.no_defaultroute, reload_ip);
1400         UPDATE(ip4table, reload_ip);
1401         UPDATE(ip6table, reload_ip);
1402         interface_merge_assignment_data(if_old, if_new);
1403
1404 #undef UPDATE
1405
1406         if (reload) {
1407                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1408                   if_old->name);
1409                 interface_clear_errors(if_old);
1410                 set_config_state(if_old, IFC_RELOAD);
1411                 goto out;
1412         }
1413
1414         if (reload_ip) {
1415                 bool config_ip_enabled = if_old->config_ip.enabled;
1416                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1417
1418                 interface_ip_set_enabled(&if_old->config_ip, false);
1419                 interface_ip_set_enabled(&if_old->proto_ip, false);
1420                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1421                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1422         }
1423
1424         if (update_prefix_delegation)
1425                 interface_update_prefix_delegation(&if_old->proto_ip);
1426
1427         interface_write_resolv_conf(if_old->jail);
1428         if (if_old->main_dev.dev)
1429                 interface_check_state(if_old);
1430
1431 out:
1432         if_new->config = NULL;
1433         interface_cleanup(if_new);
1434         free(old_config);
1435         free(if_new);
1436 }
1437
1438 static void
1439 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1440                  struct vlist_node *node_old)
1441 {
1442         struct interface *if_old = container_of(node_old, struct interface, node);
1443         struct interface *if_new = container_of(node_new, struct interface, node);
1444
1445         if (node_old && node_new) {
1446                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1447                 interface_change_config(if_old, if_new);
1448         } else if (node_old) {
1449                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1450                 set_config_state(if_old, IFC_REMOVE);
1451         } else if (node_new) {
1452                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1453                 interface_event(if_new, IFEV_CREATE);
1454                 proto_init_interface(if_new, if_new->config);
1455                 interface_claim_device(if_new);
1456                 netifd_ubus_add_interface(if_new);
1457         }
1458 }
1459
1460
1461 static void __init
1462 interface_init_list(void)
1463 {
1464         vlist_init(&interfaces, avl_strcmp, interface_update);
1465         interfaces.keep_old = true;
1466         interfaces.no_delete = true;
1467 }