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
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29 static unsigned int interface_serial = 0;
  30
  31 enum {
  32         IFACE_ATTR_IFNAME,
  33         IFACE_ATTR_PROTO,
  34         IFACE_ATTR_AUTO,
  35         IFACE_ATTR_DEFAULTROUTE,
  36         IFACE_ATTR_PEERDNS,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DNS_SEARCH,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_IP6CLASS,
  46         IFACE_ATTR_MAX
  47 };
  48
  49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  50         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  64 };
  65
  66 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  67         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  69 };
  70
  71 const struct uci_blob_param_list interface_attr_list = {
  72         .n_params = IFACE_ATTR_MAX,
  73         .params = iface_attrs,
  74         .info = iface_attr_info,
  75 };
  76
  77 static void
  78 interface_clear_errors(struct interface *iface)
  79 {
  80         struct interface_error *error, *tmp;
  81
  82         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  83                 list_del(&error->list);
  84                 free(error);
  85         }
  86 }
  87
  88 void interface_add_error(struct interface *iface, const char *subsystem,
  89                          const char *code, const char **data, int n_data)
  90 {
  91         struct interface_error *error;
  92         int i, len = 0;
  93         int *datalen = NULL;
  94         char *dest, *d_subsys, *d_code;
  95
  96         if (n_data) {
  97                 len = n_data * sizeof(char *);
  98                 datalen = alloca(len);
  99                 for (i = 0; i < n_data; i++) {
 100                         datalen[i] = strlen(data[i]) + 1;
 101                         len += datalen[i];
 102                 }
 103         }
 104
 105         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 106                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 107                 &d_code, code ? strlen(code) + 1 : 0);
 108         if (!error)
 109                 return;
 110
 111         list_add_tail(&error->list, &iface->errors);
 112
 113         dest = (char *) &error->data[n_data + 1];
 114         for (i = 0; i < n_data; i++) {
 115                 error->data[i] = dest;
 116                 memcpy(dest, data[i], datalen[i]);
 117                 dest += datalen[i];
 118         }
 119         error->data[n_data++] = NULL;
 120
 121         if (subsystem)
 122                 error->subsystem = strcpy(d_subsys, subsystem);
 123
 124         if (code)
 125                 error->code = strcpy(d_code, code);
 126 }
 127
 128 static void
 129 interface_data_del(struct interface *iface, struct interface_data *data)
 130 {
 131         avl_delete(&iface->data, &data->node);
 132         free(data);
 133 }
 134
 135 static void
 136 interface_data_flush(struct interface *iface)
 137 {
 138         struct interface_data *d, *tmp;
 139
 140         avl_for_each_element_safe(&iface->data, d, node, tmp)
 141                 interface_data_del(iface, d);
 142 }
 143
 144 int
 145 interface_add_data(struct interface *iface, const struct blob_attr *data)
 146 {
 147         struct interface_data *n, *o;
 148
 149         if (!blobmsg_check_attr(data, true))
 150                 return UBUS_STATUS_INVALID_ARGUMENT;
 151
 152         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 153         memcpy(n->data, data, blob_pad_len(data));
 154         n->node.key = blobmsg_name(n->data);
 155
 156         o = avl_find_element(&iface->data, n->node.key, o, node);
 157         if (o)
 158                 interface_data_del(iface, o);
 159
 160         avl_insert(&iface->data, &n->node);
 161         return 0;
 162 }
 163
 164 static void
 165 interface_event(struct interface *iface, enum interface_event ev)
 166 {
 167         struct interface_user *dep, *tmp;
 168         struct device *adev = NULL;
 169
 170         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 171                 dep->cb(dep, iface, ev);
 172
 173         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 174                 dep->cb(dep, iface, ev);
 175
 176         switch (ev) {
 177         case IFEV_UP:
 178                 adev = iface->l3_dev.dev;
 179                 /* fall through */
 180         case IFEV_DOWN:
 181                 alias_notify_device(iface->name, adev);
 182                 break;
 183         default:
 184                 break;
 185         }
 186 }
 187
 188 static void
 189 interface_flush_state(struct interface *iface)
 190 {
 191         if (iface->l3_dev.dev)
 192                 device_release(&iface->l3_dev);
 193         interface_data_flush(iface);
 194 }
 195
 196 static void
 197 mark_interface_down(struct interface *iface)
 198 {
 199         enum interface_state state = iface->state;
 200
 201         iface->state = IFS_DOWN;
 202         if (state == IFS_UP)
 203                 interface_event(iface, IFEV_DOWN);
 204         interface_ip_set_enabled(&iface->config_ip, false);
 205         interface_ip_flush(&iface->proto_ip);
 206         interface_flush_state(iface);
 207         system_flush_routes();
 208 }
 209
 210 void
 211 __interface_set_down(struct interface *iface, bool force)
 212 {
 213         if (iface->state == IFS_DOWN ||
 214                 iface->state == IFS_TEARDOWN)
 215                 return;
 216
 217         if (iface->state == IFS_UP)
 218                 interface_event(iface, IFEV_DOWN);
 219         iface->state = IFS_TEARDOWN;
 220         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 221         if (force)
 222                 interface_flush_state(iface);
 223
 224         if (iface->dynamic)
 225                 vlist_delete(&interfaces, &iface->node);
 226 }
 227
 228 static void
 229 interface_cb(struct device_user *dep, enum device_event ev)
 230 {
 231         struct interface *iface;
 232         bool new_state;
 233
 234         iface = container_of(dep, struct interface, main_dev);
 235         switch (ev) {
 236         case DEV_EVENT_ADD:
 237                 new_state = true;
 238                 break;
 239         case DEV_EVENT_REMOVE:
 240                 new_state = false;
 241                 break;
 242         default:
 243                 return;
 244         }
 245
 246         interface_set_available(iface, new_state);
 247         if (!new_state && dep->dev->external)
 248                 interface_set_main_dev(iface, NULL);
 249 }
 250
 251 void
 252 interface_set_available(struct interface *iface, bool new_state)
 253 {
 254         if (iface->available == new_state)
 255                 return;
 256
 257         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 258         iface->available = new_state;
 259
 260         if (new_state) {
 261                 if (iface->autostart && !config_init)
 262                         interface_set_up(iface);
 263         } else
 264                 __interface_set_down(iface, true);
 265 }
 266
 267 void
 268 interface_add_user(struct interface_user *dep, struct interface *iface)
 269 {
 270         if (!iface) {
 271                 list_add(&dep->list, &iface_all_users);
 272                 return;
 273         }
 274
 275         dep->iface = iface;
 276         list_add(&dep->list, &iface->users);
 277         if (iface->state == IFS_UP)
 278                 dep->cb(dep, iface, IFEV_UP);
 279 }
 280
 281 void
 282 interface_remove_user(struct interface_user *dep)
 283 {
 284         list_del_init(&dep->list);
 285         dep->iface = NULL;
 286 }
 287
 288 static void
 289 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 290 {
 291         struct blob_attr *cur;
 292         int rem;
 293
 294         blobmsg_for_each_attr(cur, list, rem) {
 295                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 296                         continue;
 297
 298                 if (!blobmsg_check_attr(cur, NULL))
 299                         continue;
 300
 301                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 302                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 303                 list_add(&c->head, &iface->assignment_classes);
 304         }
 305 }
 306
 307 static void
 308 interface_clear_assignment_classes(struct interface *iface)
 309 {
 310         while (!list_empty(&iface->assignment_classes)) {
 311                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 312                                 struct interface_assignment_class, head);
 313                 list_del(&c->head);
 314                 free(c);
 315         }
 316 }
 317
 318 static void
 319 interface_merge_assignment_data(struct interface *old, struct interface *new)
 320 {
 321         bool changed = (old->assignment_hint != new->assignment_hint ||
 322                         old->assignment_length != new->assignment_length ||
 323                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 324
 325         struct interface_assignment_class *c;
 326         list_for_each_entry(c, &new->assignment_classes, head) {
 327                 // Compare list entries one-by-one to see if there was a change
 328                 if (list_empty(&old->assignment_classes)) // The new list is longer
 329                         changed = true;
 330
 331                 if (changed)
 332                         break;
 333
 334                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 335                                 struct interface_assignment_class, head);
 336
 337                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 338                         break;
 339
 340                 list_del(&c_old->head);
 341                 free(c_old);
 342         }
 343
 344         // The old list was longer than the new one or the last entry didn't match
 345         if (!list_empty(&old->assignment_classes)) {
 346                 interface_clear_assignment_classes(old);
 347                 changed = true;
 348         }
 349
 350         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 351
 352         if (changed) {
 353                 old->assignment_hint = new->assignment_hint;
 354                 old->assignment_length = new->assignment_length;
 355                 interface_refresh_assignments(true);
 356         }
 357 }
 358
 359 static void
 360 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 361 {
 362         struct interface *alias = container_of(dep, struct interface, parent_iface);
 363         struct device *dev = iface->l3_dev.dev;
 364
 365         switch (ev) {
 366         case IFEV_UP:
 367                 if (!dev)
 368                         return;
 369
 370                 interface_set_main_dev(alias, dev);
 371                 interface_set_available(alias, true);
 372                 break;
 373         case IFEV_DOWN:
 374                 interface_set_available(alias, false);
 375                 interface_set_main_dev(alias, NULL);
 376                 break;
 377         case IFEV_FREE:
 378                 interface_remove_user(dep);
 379                 break;
 380         case IFEV_RELOAD:
 381         case IFEV_UPDATE:
 382                 break;
 383         }
 384 }
 385
 386 static void
 387 interface_claim_device(struct interface *iface)
 388 {
 389         struct interface *parent;
 390         struct device *dev = NULL;
 391
 392         if (iface->parent_iface.iface)
 393                 interface_remove_user(&iface->parent_iface);
 394
 395         if (iface->parent_ifname) {
 396                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 397                 iface->parent_iface.cb = interface_alias_cb;
 398                 interface_add_user(&iface->parent_iface, parent);
 399         } else if (iface->ifname &&
 400                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 401                 dev = device_get(iface->ifname, true);
 402         }
 403
 404         if (dev)
 405                 interface_set_main_dev(iface, dev);
 406
 407         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 408                 interface_set_available(iface, true);
 409 }
 410
 411 static void
 412 interface_cleanup_state(struct interface *iface)
 413 {
 414         interface_set_available(iface, false);
 415
 416         interface_flush_state(iface);
 417         interface_clear_errors(iface);
 418         interface_set_proto_state(iface, NULL);
 419
 420         if (iface->main_dev.dev)
 421                 interface_set_main_dev(iface, NULL);
 422 }
 423
 424 static void
 425 interface_cleanup(struct interface *iface)
 426 {
 427         struct interface_user *dep, *tmp;
 428
 429         if (iface->parent_iface.iface)
 430                 interface_remove_user(&iface->parent_iface);
 431
 432         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 433                 interface_remove_user(dep);
 434
 435         interface_clear_assignment_classes(iface);
 436         interface_ip_flush(&iface->config_ip);
 437         interface_cleanup_state(iface);
 438 }
 439
 440 static void
 441 interface_do_free(struct interface *iface)
 442 {
 443         interface_event(iface, IFEV_FREE);
 444         interface_cleanup(iface);
 445         free(iface->config);
 446         netifd_ubus_remove_interface(iface);
 447         avl_delete(&interfaces.avl, &iface->node.avl);
 448         free(iface);
 449 }
 450
 451 static void
 452 interface_do_reload(struct interface *iface)
 453 {
 454         interface_event(iface, IFEV_RELOAD);
 455         interface_cleanup_state(iface);
 456         proto_init_interface(iface, iface->config);
 457         interface_claim_device(iface);
 458 }
 459
 460 static void
 461 interface_handle_config_change(struct interface *iface)
 462 {
 463         enum interface_config_state state = iface->config_state;
 464
 465         iface->config_state = IFC_NORMAL;
 466         switch(state) {
 467         case IFC_NORMAL:
 468                 break;
 469         case IFC_RELOAD:
 470                 interface_do_reload(iface);
 471                 break;
 472         case IFC_REMOVE:
 473                 interface_do_free(iface);
 474                 return;
 475         }
 476         if (iface->autostart && iface->available)
 477                 interface_set_up(iface);
 478 }
 479
 480 static void
 481 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 482 {
 483         struct interface *iface = state->iface;
 484
 485         switch (ev) {
 486         case IFPEV_UP:
 487                 if (iface->state != IFS_SETUP) {
 488                         interface_event(iface, IFEV_UPDATE);
 489                         return;
 490                 }
 491
 492                 interface_ip_set_enabled(&iface->config_ip, true);
 493                 system_flush_routes();
 494                 iface->state = IFS_UP;
 495                 iface->start_time = system_get_rtime();
 496                 interface_event(iface, IFEV_UP);
 497                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 498                 break;
 499         case IFPEV_DOWN:
 500                 if (iface->state == IFS_DOWN)
 501                         return;
 502
 503                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 504                 mark_interface_down(iface);
 505                 if (iface->main_dev.dev)
 506                         device_release(&iface->main_dev);
 507                 interface_handle_config_change(iface);
 508                 break;
 509         case IFPEV_LINK_LOST:
 510                 if (iface->state != IFS_UP)
 511                         return;
 512
 513                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 514                 mark_interface_down(iface);
 515                 iface->state = IFS_SETUP;
 516                 break;
 517         }
 518
 519         interface_write_resolv_conf();
 520 }
 521
 522 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 523 {
 524         if (iface->proto) {
 525                 iface->proto->free(iface->proto);
 526                 iface->proto = NULL;
 527         }
 528         iface->state = IFS_DOWN;
 529         iface->proto = state;
 530         if (!state)
 531                 return;
 532
 533         state->proto_event = interface_proto_cb;
 534         state->iface = iface;
 535 }
 536
 537 void
 538 interface_init(struct interface *iface, const char *name,
 539                struct blob_attr *config, bool dynamic)
 540 {
 541         struct blob_attr *tb[IFACE_ATTR_MAX];
 542         struct blob_attr *cur;
 543         const char *proto_name = NULL;
 544
 545         strncpy(iface->name, name, sizeof(iface->name) - 1);
 546         INIT_LIST_HEAD(&iface->errors);
 547         INIT_LIST_HEAD(&iface->users);
 548         INIT_LIST_HEAD(&iface->hotplug_list);
 549         INIT_LIST_HEAD(&iface->assignment_classes);
 550         interface_ip_init(iface);
 551         avl_init(&iface->data, avl_strcmp, false, NULL);
 552         iface->config_ip.enabled = false;
 553
 554         iface->main_dev.cb = interface_cb;
 555
 556         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 557                       blob_data(config), blob_len(config));
 558
 559         if ((cur = tb[IFACE_ATTR_PROTO]))
 560                 proto_name = blobmsg_data(cur);
 561
 562         proto_attach_interface(iface, proto_name);
 563
 564         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 565         iface->proto_ip.no_defaultroute =
 566                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 567         iface->proto_ip.no_dns =
 568                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 569
 570         if ((cur = tb[IFACE_ATTR_DNS]))
 571                 interface_add_dns_server_list(&iface->config_ip, cur);
 572
 573         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 574                 interface_add_dns_search_list(&iface->config_ip, cur);
 575
 576         if ((cur = tb[IFACE_ATTR_METRIC]))
 577                 iface->metric = blobmsg_get_u32(cur);
 578
 579         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 580                 iface->assignment_length = blobmsg_get_u32(cur);
 581
 582         iface->assignment_hint = -1;
 583         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 584                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 585                                 ~((1 << (64 - iface->assignment_length)) - 1);
 586
 587         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 588                 interface_add_assignment_classes(iface, cur);
 589
 590
 591         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 592                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 593                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 594         }
 595
 596         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 597         struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node);
 598         if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000)
 599                 iface->ip6table = iface_old->ip6table;
 600         else
 601                 iface->ip6table = 1000 + ++interface_serial;
 602
 603         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 604                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 605                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 606         }
 607
 608         iface->config_autostart = iface->autostart;
 609         iface->dynamic = dynamic;
 610
 611         if (iface->dynamic)
 612                 iface->node.version = -1; // Don't delete on reload
 613 }
 614
 615 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 616 {
 617         struct blob_attr *tb[IFACE_ATTR_MAX];
 618         struct blob_attr *cur;
 619
 620         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 621                       blob_data(config), blob_len(config));
 622
 623         if (alias) {
 624                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 625                         iface->parent_ifname = blobmsg_data(cur);
 626
 627                 if (!iface->parent_ifname)
 628                         return false;
 629         } else {
 630                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 631                         iface->ifname = blobmsg_data(cur);
 632         }
 633
 634
 635         iface->config = config;
 636         vlist_add(&interfaces, &iface->node, iface->name);
 637         return true;
 638 }
 639
 640 void
 641 interface_add(struct interface *iface, struct blob_attr *config)
 642 {
 643         __interface_add(iface, config, false);
 644 }
 645
 646 bool
 647 interface_add_alias(struct interface *iface, struct blob_attr *config)
 648 {
 649         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 650                 return false;
 651
 652         return __interface_add(iface, config, true);
 653 }
 654
 655 void
 656 interface_set_l3_dev(struct interface *iface, struct device *dev)
 657 {
 658         bool enabled = iface->config_ip.enabled;
 659         bool claimed = iface->l3_dev.claimed;
 660
 661         if (iface->l3_dev.dev == dev)
 662                 return;
 663
 664         interface_ip_set_enabled(&iface->config_ip, false);
 665         interface_ip_flush(&iface->proto_ip);
 666         device_add_user(&iface->l3_dev, dev);
 667
 668         if (dev) {
 669                 if (claimed)
 670                         device_claim(&iface->l3_dev);
 671                 interface_ip_set_enabled(&iface->config_ip, enabled);
 672         }
 673 }
 674
 675 void
 676 interface_set_main_dev(struct interface *iface, struct device *dev)
 677 {
 678         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 679         bool claimed = iface->l3_dev.claimed;
 680
 681         if (iface->main_dev.dev == dev)
 682                 return;
 683
 684         if (set_l3)
 685                 interface_set_l3_dev(iface, dev);
 686
 687         device_add_user(&iface->main_dev, dev);
 688         if (!dev)
 689                 return;
 690
 691         if (claimed)
 692                 device_claim(&iface->l3_dev);
 693
 694         if (!iface->l3_dev.dev)
 695                 interface_set_l3_dev(iface, dev);
 696 }
 697
 698 int
 699 interface_remove_link(struct interface *iface, struct device *dev)
 700 {
 701         struct device *mdev = iface->main_dev.dev;
 702
 703         if (mdev && mdev->hotplug_ops)
 704                 return mdev->hotplug_ops->del(mdev, dev);
 705
 706         if (!iface->main_dev.hotplug)
 707                 return UBUS_STATUS_INVALID_ARGUMENT;
 708
 709         if (dev != iface->main_dev.dev)
 710                 return UBUS_STATUS_INVALID_ARGUMENT;
 711
 712         device_remove_user(&iface->main_dev);
 713         return 0;
 714 }
 715
 716 int
 717 interface_add_link(struct interface *iface, struct device *dev)
 718 {
 719         struct device *mdev = iface->main_dev.dev;
 720
 721         if (mdev == dev)
 722                 return 0;
 723
 724         if (iface->main_dev.hotplug)
 725                 device_remove_user(&iface->main_dev);
 726
 727         if (mdev) {
 728                 if (mdev->hotplug_ops)
 729                         return mdev->hotplug_ops->add(mdev, dev);
 730                 else
 731                         return UBUS_STATUS_NOT_SUPPORTED;
 732         }
 733
 734         interface_set_main_dev(iface, dev);
 735         iface->main_dev.hotplug = true;
 736         return 0;
 737 }
 738
 739 int
 740 interface_set_up(struct interface *iface)
 741 {
 742         int ret;
 743
 744         iface->autostart = true;
 745
 746         if (iface->state != IFS_DOWN)
 747                 return 0;
 748
 749         interface_clear_errors(iface);
 750         if (!iface->available) {
 751                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 752                 return -1;
 753         }
 754
 755         if (iface->main_dev.dev) {
 756                 ret = device_claim(&iface->main_dev);
 757                 if (ret)
 758                         return ret;
 759         }
 760
 761         iface->state = IFS_SETUP;
 762         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 763         if (ret) {
 764                 mark_interface_down(iface);
 765                 return ret;
 766         }
 767
 768         return 0;
 769 }
 770
 771 int
 772 interface_set_down(struct interface *iface)
 773 {
 774         if (!iface) {
 775                 vlist_for_each_element(&interfaces, iface, node)
 776                         __interface_set_down(iface, false);
 777         } else {
 778                 iface->autostart = false;
 779                 __interface_set_down(iface, false);
 780         }
 781
 782         return 0;
 783 }
 784
 785 void
 786 interface_start_pending(void)
 787 {
 788         struct interface *iface;
 789
 790         vlist_for_each_element(&interfaces, iface, node) {
 791                 if (iface->available && iface->autostart)
 792                         interface_set_up(iface);
 793         }
 794 }
 795
 796 static void
 797 set_config_state(struct interface *iface, enum interface_config_state s)
 798 {
 799         iface->config_state = s;
 800         if (iface->state == IFS_DOWN)
 801                 interface_handle_config_change(iface);
 802         else
 803                 __interface_set_down(iface, false);
 804 }
 805
 806 void
 807 interface_update_start(struct interface *iface)
 808 {
 809         interface_ip_update_start(&iface->proto_ip);
 810 }
 811
 812 void
 813 interface_update_complete(struct interface *iface)
 814 {
 815         interface_ip_update_complete(&iface->proto_ip);
 816 }
 817
 818 static void
 819 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 820 {
 821         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 822         vlist_simple_replace(&new->dns_search, &old->dns_search);
 823 }
 824
 825 static void
 826 interface_change_config(struct interface *if_old, struct interface *if_new)
 827 {
 828         struct blob_attr *old_config = if_old->config;
 829         bool reload = false, reload_ip = false;
 830
 831 #define FIELD_CHANGED_STR(field)                                        \
 832                 ((!!if_old->field != !!if_new->field) ||                \
 833                  (if_old->field &&                                      \
 834                   strcmp(if_old->field, if_new->field) != 0))
 835
 836         if (FIELD_CHANGED_STR(parent_ifname)) {
 837                 if (if_old->parent_iface.iface)
 838                         interface_remove_user(&if_old->parent_iface);
 839                 reload = true;
 840         }
 841
 842         if (FIELD_CHANGED_STR(ifname) ||
 843             if_old->proto_handler != if_new->proto_handler)
 844                 reload = true;
 845
 846         if (!if_old->proto_handler->config_params)
 847                 D(INTERFACE, "No config parameters for interface '%s'\n",
 848                   if_old->name);
 849         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 850                                        if_old->proto_handler->config_params))
 851                 reload = true;
 852
 853 #define UPDATE(field, __var) ({                                         \
 854                 bool __changed = (if_old->field != if_new->field);      \
 855                 if_old->field = if_new->field;                          \
 856                 __var |= __changed;                                     \
 857         })
 858
 859         if_old->config = if_new->config;
 860         if (!if_old->config_autostart && if_new->config_autostart)
 861                 if_old->autostart = true;
 862
 863         if_old->device_config = if_new->device_config;
 864         if_old->config_autostart = if_new->config_autostart;
 865         if_old->ifname = if_new->ifname;
 866         if_old->parent_ifname = if_new->parent_ifname;
 867         if_old->proto_handler = if_new->proto_handler;
 868
 869         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 870         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 871
 872         UPDATE(metric, reload_ip);
 873         UPDATE(proto_ip.no_defaultroute, reload_ip);
 874         UPDATE(ip4table, reload_ip);
 875         UPDATE(ip6table, reload_ip);
 876         interface_merge_assignment_data(if_old, if_new);
 877
 878 #undef UPDATE
 879
 880         if (reload) {
 881                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 882                   if_old->name);
 883                 interface_clear_errors(if_old);
 884                 set_config_state(if_old, IFC_RELOAD);
 885                 goto out;
 886         }
 887
 888         if (reload_ip) {
 889                 interface_ip_set_enabled(&if_old->config_ip, false);
 890                 interface_ip_set_enabled(&if_old->proto_ip, false);
 891                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 892                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 893         }
 894
 895         interface_write_resolv_conf();
 896
 897 out:
 898         if_new->config = NULL;
 899         interface_cleanup(if_new);
 900         free(old_config);
 901         free(if_new);
 902 }
 903
 904 static void
 905 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 906                  struct vlist_node *node_old)
 907 {
 908         struct interface *if_old = container_of(node_old, struct interface, node);
 909         struct interface *if_new = container_of(node_new, struct interface, node);
 910
 911         if (node_old && node_new) {
 912                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 913                 interface_change_config(if_old, if_new);
 914         } else if (node_old) {
 915                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 916                 set_config_state(if_old, IFC_REMOVE);
 917         } else if (node_new) {
 918                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 919                 proto_init_interface(if_new, if_new->config);
 920                 interface_claim_device(if_new);
 921                 netifd_ubus_add_interface(if_new);
 922         }
 923 }
 924
 925
 926 static void __init
 927 interface_init_list(void)
 928 {
 929         vlist_init(&interfaces, avl_strcmp, interface_update);
 930         interfaces.keep_old = true;
 931         interfaces.no_delete = true;
 932 }