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                 /* fall through */
 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         case IFS_TEARDOWN:
 323         default:
 324                 break;
 325         }
 326 }
 327
 328 static int
 329 __interface_set_up(struct interface *iface)
 330 {
 331         int ret;
 332
 333         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 334
 335         iface->state = IFS_SETUP;
 336         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 337         if (ret)
 338                 mark_interface_down(iface);
 339
 340         return ret;
 341 }
 342
 343 static void
 344 interface_check_state(struct interface *iface)
 345 {
 346         bool link_state = iface->link_state || iface->force_link;
 347
 348         switch (iface->state) {
 349         case IFS_UP:
 350         case IFS_SETUP:
 351                 if (!iface->enabled || !link_state) {
 352                         iface->state = IFS_TEARDOWN;
 353                         if (iface->dynamic)
 354                                 __set_config_state(iface, IFC_REMOVE);
 355
 356                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 357                 }
 358                 break;
 359         case IFS_DOWN:
 360                 if (!iface->available)
 361                         return;
 362
 363                 if (iface->autostart && iface->enabled && link_state && !config_init)
 364                         __interface_set_up(iface);
 365                 break;
 366         default:
 367                 break;
 368         }
 369 }
 370
 371 static void
 372 interface_set_enabled(struct interface *iface, bool new_state)
 373 {
 374         if (iface->enabled == new_state)
 375                 return;
 376
 377         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 378         iface->enabled = new_state;
 379         interface_check_state(iface);
 380 }
 381
 382 static void
 383 interface_set_link_state(struct interface *iface, bool new_state)
 384 {
 385         if (iface->link_state == new_state)
 386                 return;
 387
 388         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 389         iface->link_state = new_state;
 390         interface_check_state(iface);
 391
 392         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 393                 interface_event(iface, IFEV_LINK_UP);
 394                 iface->link_up_event = true;
 395         }
 396 }
 397
 398 static void
 399 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 400 {
 401         if (ev == DEV_EVENT_REMOVE)
 402                 device_remove_user(dep);
 403 }
 404
 405 static void
 406 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 407 {
 408         struct interface *iface;
 409
 410         iface = container_of(dep, struct interface, main_dev);
 411         switch (ev) {
 412         case DEV_EVENT_ADD:
 413                 interface_set_available(iface, true);
 414                 break;
 415         case DEV_EVENT_REMOVE:
 416                 interface_set_available(iface, false);
 417                 if (dep->dev && dep->dev->external)
 418                         interface_set_main_dev(iface, NULL);
 419                 break;
 420         case DEV_EVENT_UP:
 421                 interface_set_enabled(iface, true);
 422                 break;
 423         case DEV_EVENT_DOWN:
 424                 interface_set_enabled(iface, false);
 425                 break;
 426         case DEV_EVENT_LINK_UP:
 427                 interface_set_link_state(iface, true);
 428                 break;
 429         case DEV_EVENT_LINK_DOWN:
 430                 interface_set_link_state(iface, false);
 431                 break;
 432         case DEV_EVENT_TOPO_CHANGE:
 433                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 434                 return;
 435         default:
 436                 break;
 437         }
 438 }
 439
 440 static void
 441 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 442 {
 443         struct interface *iface;
 444
 445         iface = container_of(dep, struct interface, l3_dev);
 446         if (iface->l3_dev.dev == iface->main_dev.dev)
 447                 return;
 448
 449         switch (ev) {
 450         case DEV_EVENT_LINK_DOWN:
 451                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 452                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 453                 break;
 454         default:
 455                 break;
 456         }
 457 }
 458
 459 void
 460 interface_set_available(struct interface *iface, bool new_state)
 461 {
 462         if (iface->available == new_state)
 463                 return;
 464
 465         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 466         iface->available = new_state;
 467
 468         if (new_state) {
 469                 if (iface->autostart && !config_init)
 470                         interface_set_up(iface);
 471         } else
 472                 __interface_set_down(iface, true);
 473 }
 474
 475 void
 476 interface_add_user(struct interface_user *dep, struct interface *iface)
 477 {
 478         if (!iface) {
 479                 list_add(&dep->list, &iface_all_users);
 480                 return;
 481         }
 482
 483         dep->iface = iface;
 484         list_add(&dep->list, &iface->users);
 485         if (iface->state == IFS_UP)
 486                 dep->cb(dep, iface, IFEV_UP);
 487 }
 488
 489 void
 490 interface_remove_user(struct interface_user *dep)
 491 {
 492         list_del_init(&dep->list);
 493         dep->iface = NULL;
 494 }
 495
 496 static void
 497 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 498 {
 499         struct blob_attr *cur;
 500         int rem;
 501
 502         blobmsg_for_each_attr(cur, list, rem) {
 503                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 504                         continue;
 505
 506                 if (!blobmsg_check_attr(cur, false))
 507                         continue;
 508
 509                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 510                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 511                 list_add(&c->head, &iface->assignment_classes);
 512         }
 513 }
 514
 515 static void
 516 interface_clear_assignment_classes(struct interface *iface)
 517 {
 518         while (!list_empty(&iface->assignment_classes)) {
 519                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 520                                 struct interface_assignment_class, head);
 521                 list_del(&c->head);
 522                 free(c);
 523         }
 524 }
 525
 526 static void
 527 interface_merge_assignment_data(struct interface *old, struct interface *new)
 528 {
 529         bool changed = (old->assignment_hint != new->assignment_hint ||
 530                         old->assignment_length != new->assignment_length ||
 531                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 532                         old->assignment_weight != new->assignment_weight ||
 533                         (old->assignment_iface_id_selection == IFID_FIXED &&
 534                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 535                                 sizeof(old->assignment_fixed_iface_id))) ||
 536                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 537
 538         struct interface_assignment_class *c;
 539         list_for_each_entry(c, &new->assignment_classes, head) {
 540                 /* Compare list entries one-by-one to see if there was a change */
 541                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 542                         changed = true;
 543
 544                 if (changed)
 545                         break;
 546
 547                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 548                                 struct interface_assignment_class, head);
 549
 550                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 551                         break;
 552
 553                 list_del(&c_old->head);
 554                 free(c_old);
 555         }
 556
 557         /* The old list was longer than the new one or the last entry didn't match */
 558         if (!list_empty(&old->assignment_classes)) {
 559                 interface_clear_assignment_classes(old);
 560                 changed = true;
 561         }
 562
 563         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 564
 565         if (changed) {
 566                 old->assignment_hint = new->assignment_hint;
 567                 old->assignment_length = new->assignment_length;
 568                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 569                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 570                 old->assignment_weight = new->assignment_weight;
 571                 interface_refresh_assignments(true);
 572         }
 573 }
 574
 575 static void
 576 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 577 {
 578         struct interface *alias = container_of(dep, struct interface, parent_iface);
 579         struct device *dev = iface->l3_dev.dev;
 580
 581         switch (ev) {
 582         case IFEV_UP:
 583                 if (!dev)
 584                         return;
 585
 586                 interface_set_main_dev(alias, dev);
 587                 interface_set_available(alias, true);
 588                 break;
 589         case IFEV_DOWN:
 590         case IFEV_UP_FAILED:
 591                 interface_set_available(alias, false);
 592                 interface_set_main_dev(alias, NULL);
 593                 break;
 594         case IFEV_FREE:
 595                 interface_remove_user(dep);
 596                 break;
 597         default:
 598                 break;
 599         }
 600 }
 601
 602 static void
 603 interface_set_device_config(struct interface *iface, struct device *dev)
 604 {
 605         if (!dev || !dev->default_config)
 606                 return;
 607
 608         if (!iface->device_config &&
 609             (!dev->iface_config || dev->config_iface != iface))
 610                 return;
 611
 612         dev->config_iface = iface;
 613         dev->iface_config = iface->device_config;
 614         device_apply_config(dev, dev->type, iface->config);
 615 }
 616
 617 static void
 618 interface_claim_device(struct interface *iface)
 619 {
 620         struct interface *parent;
 621         struct device *dev = NULL;
 622
 623         if (iface->parent_iface.iface)
 624                 interface_remove_user(&iface->parent_iface);
 625
 626         device_lock();
 627
 628         if (iface->parent_ifname) {
 629                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 630                 iface->parent_iface.cb = interface_alias_cb;
 631                 interface_add_user(&iface->parent_iface, parent);
 632         } else if (iface->ifname &&
 633                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 634                 dev = device_get(iface->ifname, true);
 635                 interface_set_device_config(iface, dev);
 636         } else {
 637                 dev = iface->ext_dev.dev;
 638         }
 639
 640         if (dev)
 641                 interface_set_main_dev(iface, dev);
 642
 643         device_unlock();
 644
 645         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 646                 interface_set_available(iface, true);
 647 }
 648
 649 static void
 650 interface_cleanup_state(struct interface *iface)
 651 {
 652         interface_set_available(iface, false);
 653
 654         interface_flush_state(iface);
 655         interface_clear_errors(iface);
 656         interface_set_proto_state(iface, NULL);
 657
 658         interface_set_main_dev(iface, NULL);
 659         interface_set_l3_dev(iface, NULL);
 660 }
 661
 662 static void
 663 interface_cleanup(struct interface *iface)
 664 {
 665         struct interface_user *dep, *tmp;
 666
 667         uloop_timeout_cancel(&iface->remove_timer);
 668         device_remove_user(&iface->ext_dev);
 669
 670         if (iface->parent_iface.iface)
 671                 interface_remove_user(&iface->parent_iface);
 672
 673         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 674                 interface_remove_user(dep);
 675
 676         interface_clear_assignment_classes(iface);
 677         interface_ip_flush(&iface->config_ip);
 678         interface_cleanup_state(iface);
 679 }
 680
 681 static void
 682 interface_do_free(struct interface *iface)
 683 {
 684         interface_event(iface, IFEV_FREE);
 685         interface_cleanup(iface);
 686         free(iface->config);
 687         netifd_ubus_remove_interface(iface);
 688         avl_delete(&interfaces.avl, &iface->node.avl);
 689         if (iface->jail)
 690                 free(iface->jail);
 691         if (iface->jail_ifname)
 692                 free(iface->jail_ifname);
 693
 694         free(iface);
 695 }
 696
 697 static void
 698 interface_do_reload(struct interface *iface)
 699 {
 700         interface_event(iface, IFEV_RELOAD);
 701         interface_cleanup_state(iface);
 702         proto_init_interface(iface, iface->config);
 703         interface_claim_device(iface);
 704 }
 705
 706 static void
 707 interface_handle_config_change(struct interface *iface)
 708 {
 709         enum interface_config_state state = iface->config_state;
 710
 711         iface->config_state = IFC_NORMAL;
 712         switch(state) {
 713         case IFC_NORMAL:
 714                 break;
 715         case IFC_RELOAD:
 716                 interface_do_reload(iface);
 717                 break;
 718         case IFC_REMOVE:
 719                 interface_do_free(iface);
 720                 return;
 721         }
 722         if (iface->autostart)
 723                 interface_set_up(iface);
 724 }
 725
 726 static void
 727 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 728 {
 729         struct interface *iface = state->iface;
 730
 731         switch (ev) {
 732         case IFPEV_UP:
 733                 if (iface->state != IFS_SETUP) {
 734                         if (iface->state == IFS_UP && iface->updated)
 735                                 interface_event(iface, IFEV_UPDATE);
 736                         return;
 737                 }
 738
 739                 if (!iface->l3_dev.dev)
 740                         interface_set_l3_dev(iface, iface->main_dev.dev);
 741
 742                 interface_ip_set_enabled(&iface->config_ip, true);
 743                 interface_ip_set_enabled(&iface->proto_ip, true);
 744                 system_flush_routes();
 745                 iface->state = IFS_UP;
 746                 iface->start_time = system_get_rtime();
 747                 interface_event(iface, IFEV_UP);
 748                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 749                 break;
 750         case IFPEV_DOWN:
 751                 if (iface->state == IFS_DOWN)
 752                         return;
 753
 754                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 755                 mark_interface_down(iface);
 756                 if (iface->main_dev.dev)
 757                         device_release(&iface->main_dev);
 758                 if (iface->l3_dev.dev)
 759                         device_remove_user(&iface->l3_dev);
 760                 interface_handle_config_change(iface);
 761                 break;
 762         case IFPEV_LINK_LOST:
 763                 if (iface->state != IFS_UP)
 764                         return;
 765
 766                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 767                 mark_interface_down(iface);
 768                 iface->state = IFS_SETUP;
 769                 break;
 770         default:
 771                 return;
 772         }
 773
 774         interface_write_resolv_conf(iface->jail);
 775 }
 776
 777 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 778 {
 779         if (iface->proto) {
 780                 iface->proto->free(iface->proto);
 781                 iface->proto = NULL;
 782         }
 783         iface->state = IFS_DOWN;
 784         iface->proto = state;
 785         if (!state)
 786                 return;
 787
 788         state->proto_event = interface_proto_event_cb;
 789         state->iface = iface;
 790 }
 791
 792 struct interface *
 793 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 794 {
 795         struct interface *iface;
 796         struct blob_attr *tb[IFACE_ATTR_MAX];
 797         struct blob_attr *cur;
 798         const char *proto_name = NULL;
 799         char *iface_name;
 800         bool force_link = false;
 801
 802         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 803         iface->name = strcpy(iface_name, name);
 804         INIT_LIST_HEAD(&iface->errors);
 805         INIT_LIST_HEAD(&iface->users);
 806         INIT_LIST_HEAD(&iface->hotplug_list);
 807         INIT_LIST_HEAD(&iface->assignment_classes);
 808         interface_ip_init(iface);
 809         avl_init(&iface->data, avl_strcmp, false, NULL);
 810         iface->config_ip.enabled = false;
 811
 812         iface->main_dev.cb = interface_main_dev_cb;
 813         iface->l3_dev.cb = interface_l3_dev_cb;
 814         iface->ext_dev.cb = interface_ext_dev_cb;
 815
 816         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 817                       blob_data(config), blob_len(config));
 818
 819         if ((cur = tb[IFACE_ATTR_PROTO]))
 820                 proto_name = blobmsg_data(cur);
 821
 822         proto_attach_interface(iface, proto_name);
 823         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 824                 force_link = true;
 825
 826         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 827         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 828         iface->dynamic = dynamic;
 829         iface->proto_ip.no_defaultroute =
 830                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 831         iface->proto_ip.no_dns =
 832                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 833
 834         if ((cur = tb[IFACE_ATTR_DNS]))
 835                 interface_add_dns_server_list(&iface->config_ip, cur);
 836
 837         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 838                 interface_add_dns_search_list(&iface->config_ip, cur);
 839
 840         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 841                 iface->dns_metric = blobmsg_get_u32(cur);
 842
 843         if ((cur = tb[IFACE_ATTR_METRIC]))
 844                 iface->metric = blobmsg_get_u32(cur);
 845
 846         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 847                 iface->assignment_length = blobmsg_get_u32(cur);
 848
 849         /* defaults */
 850         iface->assignment_iface_id_selection = IFID_FIXED;
 851         iface->assignment_fixed_iface_id = in6addr_any;
 852         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 853
 854         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 855                 const char *ifaceid = blobmsg_data(cur);
 856                 if (!strcmp(ifaceid, "random")) {
 857                         iface->assignment_iface_id_selection = IFID_RANDOM;
 858                 }
 859                 else if (!strcmp(ifaceid, "eui64")) {
 860                         iface->assignment_iface_id_selection = IFID_EUI64;
 861                 }
 862                 else {
 863                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 864                            if we cannot parse -> revert to iface id 1 */
 865                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 866                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 867                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 868                                 iface->assignment_fixed_iface_id = in6addr_any;
 869                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 870                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 871                                                         falling back to iface id 1.\n", iface->name);
 872                         }
 873                 }
 874         }
 875
 876         iface->assignment_hint = -1;
 877         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 878                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 879                                 ~((1 << (64 - iface->assignment_length)) - 1);
 880
 881         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 882                 interface_add_assignment_classes(iface, cur);
 883
 884         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 885                 iface->assignment_weight = blobmsg_get_u32(cur);
 886
 887         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 888                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 889                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 890         }
 891
 892         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 893                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 894                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 895         }
 896
 897         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 898
 899         iface->config_autostart = iface->autostart;
 900         iface->jail = NULL;
 901
 902         if ((cur = tb[IFACE_ATTR_JAIL])) {
 903                 iface->jail = strdup(blobmsg_get_string(cur));
 904                 iface->autostart = false;
 905         }
 906
 907         iface->jail_ifname = NULL;
 908         if ((cur = tb[IFACE_ATTR_JAIL_IFNAME]))
 909                 iface->jail_ifname = strdup(blobmsg_get_string(cur));
 910
 911         return iface;
 912 }
 913
 914 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 915 {
 916         struct blob_attr *tb[IFACE_ATTR_MAX];
 917         struct blob_attr *cur;
 918         char *name = NULL;
 919
 920         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 921                       blob_data(config), blob_len(config));
 922
 923         if (alias) {
 924                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 925                         iface->parent_ifname = blobmsg_data(cur);
 926
 927                 if (!iface->parent_ifname)
 928                         return false;
 929         } else {
 930                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 931                         iface->ifname = blobmsg_data(cur);
 932         }
 933
 934         if (iface->dynamic) {
 935                 name = strdup(iface->name);
 936
 937                 if (!name)
 938                         return false;
 939         }
 940
 941         iface->config = config;
 942         vlist_add(&interfaces, &iface->node, iface->name);
 943
 944         if (name) {
 945                 iface = vlist_find(&interfaces, name, iface, node);
 946                 free(name);
 947
 948                 /* Don't delete dynamic interface on reload */
 949                 if (iface)
 950                         iface->node.version = -1;
 951         }
 952
 953         return true;
 954 }
 955
 956 bool
 957 interface_add(struct interface *iface, struct blob_attr *config)
 958 {
 959         return __interface_add(iface, config, false);
 960 }
 961
 962 bool
 963 interface_add_alias(struct interface *iface, struct blob_attr *config)
 964 {
 965         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 966                 return false;
 967
 968         return __interface_add(iface, config, true);
 969 }
 970
 971 void
 972 interface_set_l3_dev(struct interface *iface, struct device *dev)
 973 {
 974         bool enabled = iface->config_ip.enabled;
 975         bool claimed = iface->l3_dev.claimed;
 976
 977         if (iface->l3_dev.dev == dev)
 978                 return;
 979
 980         interface_ip_set_enabled(&iface->config_ip, false);
 981         interface_ip_set_enabled(&iface->proto_ip, false);
 982         interface_ip_flush(&iface->proto_ip);
 983         device_add_user(&iface->l3_dev, dev);
 984
 985         if (dev) {
 986                 if (claimed) {
 987                         if (device_claim(&iface->l3_dev) < 0)
 988                                 return;
 989                 }
 990                 interface_ip_set_enabled(&iface->config_ip, enabled);
 991                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 992         }
 993 }
 994
 995 static void
 996 interface_set_main_dev(struct interface *iface, struct device *dev)
 997 {
 998         bool claimed = iface->l3_dev.claimed;
 999
1000         if (iface->main_dev.dev == dev)
1001                 return;
1002
1003         interface_set_available(iface, false);
1004         device_add_user(&iface->main_dev, dev);
1005         if (!dev) {
1006                 interface_set_link_state(iface, false);
1007                 return;
1008         }
1009
1010         if (claimed) {
1011                 if (device_claim(&iface->l3_dev) < 0)
1012                         return;
1013         }
1014
1015         if (!iface->l3_dev.dev)
1016                 interface_set_l3_dev(iface, dev);
1017 }
1018
1019 static int
1020 interface_remove_link(struct interface *iface, struct device *dev)
1021 {
1022         struct device *mdev = iface->main_dev.dev;
1023
1024         if (mdev && mdev->hotplug_ops)
1025                 return mdev->hotplug_ops->del(mdev, dev);
1026
1027         if (dev == iface->ext_dev.dev)
1028                 device_remove_user(&iface->ext_dev);
1029
1030         if (!iface->main_dev.hotplug)
1031                 return UBUS_STATUS_INVALID_ARGUMENT;
1032
1033         if (dev != iface->main_dev.dev)
1034                 return UBUS_STATUS_INVALID_ARGUMENT;
1035
1036         interface_set_main_dev(iface, NULL);
1037         return 0;
1038 }
1039
1040 static int
1041 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
1042 {
1043         struct device *mdev = iface->main_dev.dev;
1044
1045         if (mdev == dev)
1046                 return 0;
1047
1048         if (iface->main_dev.hotplug)
1049                 device_remove_user(&iface->main_dev);
1050
1051         if (mdev) {
1052                 if (mdev->hotplug_ops)
1053                         return mdev->hotplug_ops->add(mdev, dev);
1054                 else
1055                         return UBUS_STATUS_NOT_SUPPORTED;
1056         }
1057
1058         if (link_ext)
1059                 device_add_user(&iface->ext_dev, dev);
1060
1061         interface_set_main_dev(iface, dev);
1062         iface->main_dev.hotplug = true;
1063         return 0;
1064 }
1065
1066 int
1067 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1068 {
1069         struct device *dev;
1070         int ret;
1071
1072         device_lock();
1073
1074         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1075         if (!dev) {
1076                 ret = UBUS_STATUS_NOT_FOUND;
1077                 goto out;
1078         }
1079
1080         if (add) {
1081                 interface_set_device_config(iface, dev);
1082                 device_set_present(dev, true);
1083
1084                 ret = interface_add_link(iface, dev, link_ext);
1085         } else {
1086                 ret = interface_remove_link(iface, dev);
1087         }
1088
1089 out:
1090         device_unlock();
1091
1092         return ret;
1093 }
1094
1095 void
1096 interface_set_up(struct interface *iface)
1097 {
1098         int ret;
1099         const char *error = NULL;
1100
1101         iface->autostart = true;
1102
1103         if (iface->state != IFS_DOWN)
1104                 return;
1105
1106         interface_clear_errors(iface);
1107         if (iface->available) {
1108                 if (iface->main_dev.dev) {
1109                         ret = device_claim(&iface->main_dev);
1110                         if (!ret)
1111                                 interface_check_state(iface);
1112                         else
1113                                 error = "DEVICE_CLAIM_FAILED";
1114                 } else {
1115                         ret = __interface_set_up(iface);
1116                         if (ret)
1117                                 error = "SETUP_FAILED";
1118                 }
1119         } else
1120                 error = "NO_DEVICE";
1121
1122         if (error)
1123                 interface_add_error(iface, "interface", error, NULL, 0);
1124 }
1125
1126 void
1127 interface_set_down(struct interface *iface)
1128 {
1129         if (!iface) {
1130                 vlist_for_each_element(&interfaces, iface, node)
1131                         __interface_set_down(iface, false);
1132         } else {
1133                 iface->autostart = false;
1134                 __interface_set_down(iface, false);
1135         }
1136 }
1137
1138 int
1139 interface_renew(struct interface *iface)
1140 {
1141         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1142                 return -1;
1143
1144         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1145 }
1146
1147 void
1148 interface_start_pending(void)
1149 {
1150         struct interface *iface;
1151
1152         vlist_for_each_element(&interfaces, iface, node) {
1153                 if (iface->autostart)
1154                         interface_set_up(iface);
1155         }
1156 }
1157
1158 void
1159 interface_start_jail(const char *jail, const pid_t netns_pid)
1160 {
1161         struct interface *iface;
1162         int netns_fd;
1163         int wstatus;
1164         pid_t pr = 0;
1165
1166         netns_fd = system_netns_open(netns_pid);
1167         if (netns_fd < 0)
1168                 return;
1169
1170         vlist_for_each_element(&interfaces, iface, node) {
1171                 if (!iface->jail || strcmp(iface->jail, jail))
1172                         continue;
1173
1174                 system_link_netns_move(iface->main_dev.dev, netns_fd, iface->jail_ifname);
1175         }
1176
1177         close(netns_fd);
1178
1179         pr = fork();
1180         if (pr) {
1181                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1182                 return;
1183         }
1184
1185         /* child process */
1186         netns_fd = system_netns_open(netns_pid);
1187         if (netns_fd < 0)
1188                 return;
1189
1190         system_netns_set(netns_fd);
1191         system_init();
1192         vlist_for_each_element(&interfaces, iface, node) {
1193                 if (!iface->jail || strcmp(iface->jail, jail))
1194                         continue;
1195
1196                 /*
1197                  * The interface has already been renamed and is inside target
1198                  * namespace, hence overwrite ifname with jail_ifname for
1199                  * interface_set_up().
1200                  * We are inside a fork which got it's own copy of the interfaces
1201                  * list, so we can mess with it :)
1202                  */
1203                 if (iface->jail_ifname)
1204                         iface->ifname = iface->jail_ifname;
1205
1206                 interface_do_reload(iface);
1207                 interface_set_up(iface);
1208         }
1209
1210         close(netns_fd);
1211         _exit(0);
1212 }
1213
1214 void
1215 interface_stop_jail(const char *jail, const pid_t netns_pid)
1216 {
1217         struct interface *iface;
1218         int netns_fd, root_netns;
1219         int wstatus;
1220         pid_t parent_pid = getpid();
1221         pid_t pr = 0;
1222         const char *orig_ifname;
1223
1224         pr = fork();
1225         if (pr) {
1226                 waitpid(pr, &wstatus, WUNTRACED | WCONTINUED);
1227                 return;
1228         }
1229
1230         /* child process */
1231         root_netns = system_netns_open(parent_pid);
1232         if (root_netns < 0)
1233                 return;
1234
1235         netns_fd = system_netns_open(netns_pid);
1236         if (netns_fd < 0)
1237                 return;
1238
1239         system_netns_set(netns_fd);
1240         system_init();
1241         vlist_for_each_element(&interfaces, iface, node) {
1242                 if (!iface->jail || strcmp(iface->jail, jail))
1243                         continue;
1244
1245                 orig_ifname = iface->ifname;
1246                 if (iface->jail_ifname)
1247                         iface->ifname = iface->jail_ifname;
1248
1249                 interface_do_reload(iface);
1250                 interface_set_down(iface);
1251                 system_link_netns_move(iface->main_dev.dev, root_netns, orig_ifname);
1252         }
1253
1254         close(root_netns);
1255         close(netns_fd);
1256         _exit(0);
1257 }
1258
1259 static void
1260 set_config_state(struct interface *iface, enum interface_config_state s)
1261 {
1262         __set_config_state(iface, s);
1263         if (iface->state == IFS_DOWN)
1264                 interface_handle_config_change(iface);
1265         else
1266                 __interface_set_down(iface, false);
1267 }
1268
1269 void
1270 interface_update_start(struct interface *iface, const bool keep_old)
1271 {
1272         iface->updated = 0;
1273
1274         if (!keep_old)
1275                 interface_ip_update_start(&iface->proto_ip);
1276 }
1277
1278 void
1279 interface_update_complete(struct interface *iface)
1280 {
1281         interface_ip_update_complete(&iface->proto_ip);
1282 }
1283
1284 static void
1285 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1286 {
1287         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1288         vlist_simple_replace(&new->dns_search, &old->dns_search);
1289 }
1290
1291 static bool
1292 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1293 {
1294         struct blob_attr *ntb[__DEV_ATTR_MAX];
1295         struct blob_attr *otb[__DEV_ATTR_MAX];
1296         struct device *dev = if_old->main_dev.dev;
1297         unsigned long diff = 0;
1298
1299         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1300
1301         if (!dev)
1302                 return false;
1303
1304         if (if_old->device_config != if_new->device_config)
1305                 return true;
1306
1307         if (!if_new->device_config)
1308                 return false;
1309
1310         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1311                 blob_data(if_old->config), blob_len(if_old->config));
1312
1313         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1314                 blob_data(if_new->config), blob_len(if_new->config));
1315
1316         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1317         return diff;
1318 }
1319
1320 static void
1321 interface_change_config(struct interface *if_old, struct interface *if_new)
1322 {
1323         struct blob_attr *old_config = if_old->config;
1324         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1325
1326 #define FIELD_CHANGED_STR(field)                                        \
1327                 ((!!if_old->field != !!if_new->field) ||                \
1328                  (if_old->field &&                                      \
1329                   strcmp(if_old->field, if_new->field) != 0))
1330
1331         if (FIELD_CHANGED_STR(parent_ifname)) {
1332                 if (if_old->parent_iface.iface)
1333                         interface_remove_user(&if_old->parent_iface);
1334                 reload = true;
1335         }
1336
1337         if (!reload && interface_device_config_changed(if_old, if_new))
1338                 reload = true;
1339
1340         if (FIELD_CHANGED_STR(ifname) ||
1341             if_old->proto_handler != if_new->proto_handler)
1342                 reload = true;
1343
1344         if (!if_old->proto_handler->config_params)
1345                 D(INTERFACE, "No config parameters for interface '%s'\n",
1346                   if_old->name);
1347         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1348                                        if_old->proto_handler->config_params))
1349                 reload = true;
1350
1351 #define UPDATE(field, __var) ({                                         \
1352                 bool __changed = (if_old->field != if_new->field);      \
1353                 if_old->field = if_new->field;                          \
1354                 __var |= __changed;                                     \
1355         })
1356
1357         if_old->config = if_new->config;
1358         if (if_old->config_autostart != if_new->config_autostart) {
1359                 if (if_old->config_autostart)
1360                         reload = true;
1361
1362                 if_old->autostart = if_new->config_autostart;
1363         }
1364
1365         if_old->device_config = if_new->device_config;
1366         if_old->config_autostart = if_new->config_autostart;
1367         if (if_old->jail)
1368                 free(if_old->jail);
1369
1370         if_old->jail = if_new->jail;
1371         if (if_old->jail)
1372                 if_old->autostart = false;
1373
1374         if (if_old->jail_ifname)
1375                 free(if_old->jail_ifname);
1376
1377         if_old->jail_ifname = if_new->jail_ifname;
1378
1379         if_old->ifname = if_new->ifname;
1380         if_old->parent_ifname = if_new->parent_ifname;
1381         if_old->dynamic = if_new->dynamic;
1382         if_old->proto_handler = if_new->proto_handler;
1383         if_old->force_link = if_new->force_link;
1384         if_old->dns_metric = if_new->dns_metric;
1385
1386         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1387                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1388                 update_prefix_delegation = true;
1389         }
1390
1391         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1392         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1393
1394         UPDATE(metric, reload_ip);
1395         UPDATE(proto_ip.no_defaultroute, reload_ip);
1396         UPDATE(ip4table, reload_ip);
1397         UPDATE(ip6table, reload_ip);
1398         interface_merge_assignment_data(if_old, if_new);
1399
1400 #undef UPDATE
1401
1402         if (reload) {
1403                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1404                   if_old->name);
1405                 interface_clear_errors(if_old);
1406                 set_config_state(if_old, IFC_RELOAD);
1407                 goto out;
1408         }
1409
1410         if (reload_ip) {
1411                 bool config_ip_enabled = if_old->config_ip.enabled;
1412                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1413
1414                 interface_ip_set_enabled(&if_old->config_ip, false);
1415                 interface_ip_set_enabled(&if_old->proto_ip, false);
1416                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1417                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1418         }
1419
1420         if (update_prefix_delegation)
1421                 interface_update_prefix_delegation(&if_old->proto_ip);
1422
1423         interface_write_resolv_conf(if_old->jail);
1424         if (if_old->main_dev.dev)
1425                 interface_check_state(if_old);
1426
1427 out:
1428         if_new->config = NULL;
1429         interface_cleanup(if_new);
1430         free(old_config);
1431         free(if_new);
1432 }
1433
1434 static void
1435 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1436                  struct vlist_node *node_old)
1437 {
1438         struct interface *if_old = container_of(node_old, struct interface, node);
1439         struct interface *if_new = container_of(node_new, struct interface, node);
1440
1441         if (node_old && node_new) {
1442                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1443                 interface_change_config(if_old, if_new);
1444         } else if (node_old) {
1445                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1446                 set_config_state(if_old, IFC_REMOVE);
1447         } else if (node_new) {
1448                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1449                 interface_event(if_new, IFEV_CREATE);
1450                 proto_init_interface(if_new, if_new->config);
1451                 interface_claim_device(if_new);
1452                 netifd_ubus_add_interface(if_new);
1453         }
1454 }
1455
1456
1457 static void __init
1458 interface_init_list(void)
1459 {
1460         vlist_init(&interfaces, avl_strcmp, interface_update);
1461         interfaces.keep_old = true;
1462         interfaces.no_delete = true;
1463 }