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(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                 break;
 382         }
 383 }
 384
 385 static void
 386 interface_claim_device(struct interface *iface)
 387 {
 388         struct interface *parent;
 389         struct device *dev = NULL;
 390
 391         if (iface->parent_iface.iface)
 392                 interface_remove_user(&iface->parent_iface);
 393
 394         if (iface->parent_ifname) {
 395                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 396                 iface->parent_iface.cb = interface_alias_cb;
 397                 interface_add_user(&iface->parent_iface, parent);
 398         } else if (iface->ifname &&
 399                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 400                 dev = device_get(iface->ifname, true);
 401         }
 402
 403         if (dev)
 404                 interface_set_main_dev(iface, dev);
 405
 406         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 407                 interface_set_available(iface, true);
 408 }
 409
 410 static void
 411 interface_cleanup_state(struct interface *iface)
 412 {
 413         interface_set_available(iface, false);
 414
 415         interface_flush_state(iface);
 416         interface_clear_errors(iface);
 417         interface_set_proto_state(iface, NULL);
 418
 419         if (iface->main_dev.dev)
 420                 interface_set_main_dev(iface, NULL);
 421 }
 422
 423 static void
 424 interface_cleanup(struct interface *iface)
 425 {
 426         struct interface_user *dep, *tmp;
 427
 428         if (iface->parent_iface.iface)
 429                 interface_remove_user(&iface->parent_iface);
 430
 431         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 432                 interface_remove_user(dep);
 433
 434         interface_clear_assignment_classes(iface);
 435         interface_ip_flush(&iface->config_ip);
 436         interface_cleanup_state(iface);
 437 }
 438
 439 static void
 440 interface_do_free(struct interface *iface)
 441 {
 442         interface_event(iface, IFEV_FREE);
 443         interface_cleanup(iface);
 444         free(iface->config);
 445         netifd_ubus_remove_interface(iface);
 446         avl_delete(&interfaces.avl, &iface->node.avl);
 447         free(iface);
 448 }
 449
 450 static void
 451 interface_do_reload(struct interface *iface)
 452 {
 453         interface_event(iface, IFEV_RELOAD);
 454         interface_cleanup_state(iface);
 455         proto_init_interface(iface, iface->config);
 456         interface_claim_device(iface);
 457 }
 458
 459 static void
 460 interface_handle_config_change(struct interface *iface)
 461 {
 462         enum interface_config_state state = iface->config_state;
 463
 464         iface->config_state = IFC_NORMAL;
 465         switch(state) {
 466         case IFC_NORMAL:
 467                 break;
 468         case IFC_RELOAD:
 469                 interface_do_reload(iface);
 470                 break;
 471         case IFC_REMOVE:
 472                 interface_do_free(iface);
 473                 return;
 474         }
 475         if (iface->autostart && iface->available)
 476                 interface_set_up(iface);
 477 }
 478
 479 static void
 480 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 481 {
 482         struct interface *iface = state->iface;
 483
 484         switch (ev) {
 485         case IFPEV_UP:
 486                 if (iface->state != IFS_SETUP)
 487                         return;
 488
 489                 interface_ip_set_enabled(&iface->config_ip, true);
 490                 system_flush_routes();
 491                 iface->state = IFS_UP;
 492                 iface->start_time = system_get_rtime();
 493                 interface_event(iface, IFEV_UP);
 494                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 495                 break;
 496         case IFPEV_DOWN:
 497                 if (iface->state == IFS_DOWN)
 498                         return;
 499
 500                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 501                 mark_interface_down(iface);
 502                 if (iface->main_dev.dev)
 503                         device_release(&iface->main_dev);
 504                 interface_handle_config_change(iface);
 505                 break;
 506         case IFPEV_LINK_LOST:
 507                 if (iface->state != IFS_UP)
 508                         return;
 509
 510                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 511                 mark_interface_down(iface);
 512                 iface->state = IFS_SETUP;
 513                 break;
 514         }
 515
 516         interface_write_resolv_conf();
 517 }
 518
 519 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 520 {
 521         if (iface->proto) {
 522                 iface->proto->free(iface->proto);
 523                 iface->proto = NULL;
 524         }
 525         iface->state = IFS_DOWN;
 526         iface->proto = state;
 527         if (!state)
 528                 return;
 529
 530         state->proto_event = interface_proto_cb;
 531         state->iface = iface;
 532 }
 533
 534 void
 535 interface_init(struct interface *iface, const char *name,
 536                struct blob_attr *config, bool dynamic)
 537 {
 538         struct blob_attr *tb[IFACE_ATTR_MAX];
 539         struct blob_attr *cur;
 540         const char *proto_name = NULL;
 541
 542         strncpy(iface->name, name, sizeof(iface->name) - 1);
 543         INIT_LIST_HEAD(&iface->errors);
 544         INIT_LIST_HEAD(&iface->users);
 545         INIT_LIST_HEAD(&iface->hotplug_list);
 546         INIT_LIST_HEAD(&iface->assignment_classes);
 547         interface_ip_init(iface);
 548         avl_init(&iface->data, avl_strcmp, false, NULL);
 549         iface->config_ip.enabled = false;
 550
 551         iface->main_dev.cb = interface_cb;
 552
 553         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 554                       blob_data(config), blob_len(config));
 555
 556         if ((cur = tb[IFACE_ATTR_PROTO]))
 557                 proto_name = blobmsg_data(cur);
 558
 559         proto_attach_interface(iface, proto_name);
 560
 561         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 562         iface->proto_ip.no_defaultroute =
 563                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 564         iface->proto_ip.no_dns =
 565                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 566
 567         if ((cur = tb[IFACE_ATTR_DNS]))
 568                 interface_add_dns_server_list(&iface->config_ip, cur);
 569
 570         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 571                 interface_add_dns_search_list(&iface->config_ip, cur);
 572
 573         if ((cur = tb[IFACE_ATTR_METRIC]))
 574                 iface->metric = blobmsg_get_u32(cur);
 575
 576         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 577                 iface->assignment_length = blobmsg_get_u32(cur);
 578
 579         iface->assignment_hint = -1;
 580         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 581                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 582                                 ~((1 << (64 - iface->assignment_length)) - 1);
 583
 584         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 585                 interface_add_assignment_classes(iface, cur);
 586
 587
 588         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 589                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 590                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 591         }
 592
 593         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 594         struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node);
 595         if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000)
 596                 iface->ip6table = iface_old->ip6table;
 597         else
 598                 iface->ip6table = 1000 + ++interface_serial;
 599
 600         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 601                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 602                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 603         }
 604
 605         iface->config_autostart = iface->autostart;
 606         iface->dynamic = dynamic;
 607
 608         if (iface->dynamic)
 609                 iface->node.version = -1; // Don't delete on reload
 610 }
 611
 612 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 613 {
 614         struct blob_attr *tb[IFACE_ATTR_MAX];
 615         struct blob_attr *cur;
 616
 617         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 618                       blob_data(config), blob_len(config));
 619
 620         if (alias) {
 621                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 622                         iface->parent_ifname = blobmsg_data(cur);
 623
 624                 if (!iface->parent_ifname)
 625                         return false;
 626         } else {
 627                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 628                         iface->ifname = blobmsg_data(cur);
 629         }
 630
 631
 632         iface->config = config;
 633         vlist_add(&interfaces, &iface->node, iface->name);
 634         return true;
 635 }
 636
 637 void
 638 interface_add(struct interface *iface, struct blob_attr *config)
 639 {
 640         __interface_add(iface, config, false);
 641 }
 642
 643 bool
 644 interface_add_alias(struct interface *iface, struct blob_attr *config)
 645 {
 646         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 647                 return false;
 648
 649         return __interface_add(iface, config, true);
 650 }
 651
 652 void
 653 interface_set_l3_dev(struct interface *iface, struct device *dev)
 654 {
 655         bool enabled = iface->config_ip.enabled;
 656         bool claimed = iface->l3_dev.claimed;
 657
 658         if (iface->l3_dev.dev == dev)
 659                 return;
 660
 661         interface_ip_set_enabled(&iface->config_ip, false);
 662         interface_ip_flush(&iface->proto_ip);
 663         device_add_user(&iface->l3_dev, dev);
 664
 665         if (dev) {
 666                 if (claimed)
 667                         device_claim(&iface->l3_dev);
 668                 interface_ip_set_enabled(&iface->config_ip, enabled);
 669         }
 670 }
 671
 672 void
 673 interface_set_main_dev(struct interface *iface, struct device *dev)
 674 {
 675         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 676         bool claimed = iface->l3_dev.claimed;
 677
 678         if (iface->main_dev.dev == dev)
 679                 return;
 680
 681         if (set_l3)
 682                 interface_set_l3_dev(iface, dev);
 683
 684         device_add_user(&iface->main_dev, dev);
 685         if (!dev)
 686                 return;
 687
 688         if (claimed)
 689                 device_claim(&iface->l3_dev);
 690
 691         if (!iface->l3_dev.dev)
 692                 interface_set_l3_dev(iface, dev);
 693 }
 694
 695 int
 696 interface_remove_link(struct interface *iface, struct device *dev)
 697 {
 698         struct device *mdev = iface->main_dev.dev;
 699
 700         if (mdev && mdev->hotplug_ops)
 701                 return mdev->hotplug_ops->del(mdev, dev);
 702
 703         if (!iface->main_dev.hotplug)
 704                 return UBUS_STATUS_INVALID_ARGUMENT;
 705
 706         if (dev != iface->main_dev.dev)
 707                 return UBUS_STATUS_INVALID_ARGUMENT;
 708
 709         device_remove_user(&iface->main_dev);
 710         return 0;
 711 }
 712
 713 int
 714 interface_add_link(struct interface *iface, struct device *dev)
 715 {
 716         struct device *mdev = iface->main_dev.dev;
 717
 718         if (mdev == dev)
 719                 return 0;
 720
 721         if (iface->main_dev.hotplug)
 722                 device_remove_user(&iface->main_dev);
 723
 724         if (mdev) {
 725                 if (mdev->hotplug_ops)
 726                         return mdev->hotplug_ops->add(mdev, dev);
 727                 else
 728                         return UBUS_STATUS_NOT_SUPPORTED;
 729         }
 730
 731         interface_set_main_dev(iface, dev);
 732         iface->main_dev.hotplug = true;
 733         return 0;
 734 }
 735
 736 int
 737 interface_set_up(struct interface *iface)
 738 {
 739         int ret;
 740
 741         iface->autostart = true;
 742
 743         if (iface->state != IFS_DOWN)
 744                 return 0;
 745
 746         interface_clear_errors(iface);
 747         if (!iface->available) {
 748                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 749                 return -1;
 750         }
 751
 752         if (iface->main_dev.dev) {
 753                 ret = device_claim(&iface->main_dev);
 754                 if (ret)
 755                         return ret;
 756         }
 757
 758         iface->state = IFS_SETUP;
 759         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 760         if (ret) {
 761                 mark_interface_down(iface);
 762                 return ret;
 763         }
 764
 765         return 0;
 766 }
 767
 768 int
 769 interface_set_down(struct interface *iface)
 770 {
 771         if (!iface) {
 772                 vlist_for_each_element(&interfaces, iface, node)
 773                         __interface_set_down(iface, false);
 774         } else {
 775                 iface->autostart = false;
 776                 __interface_set_down(iface, false);
 777         }
 778
 779         return 0;
 780 }
 781
 782 void
 783 interface_start_pending(void)
 784 {
 785         struct interface *iface;
 786
 787         vlist_for_each_element(&interfaces, iface, node) {
 788                 if (iface->available && iface->autostart)
 789                         interface_set_up(iface);
 790         }
 791 }
 792
 793 static void
 794 set_config_state(struct interface *iface, enum interface_config_state s)
 795 {
 796         iface->config_state = s;
 797         if (iface->state == IFS_DOWN)
 798                 interface_handle_config_change(iface);
 799         else
 800                 __interface_set_down(iface, false);
 801 }
 802
 803 void
 804 interface_update_start(struct interface *iface)
 805 {
 806         interface_ip_update_start(&iface->proto_ip);
 807 }
 808
 809 void
 810 interface_update_complete(struct interface *iface)
 811 {
 812         interface_ip_update_complete(&iface->proto_ip);
 813 }
 814
 815 static void
 816 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 817 {
 818         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 819         vlist_simple_replace(&new->dns_search, &old->dns_search);
 820 }
 821
 822 static void
 823 interface_change_config(struct interface *if_old, struct interface *if_new)
 824 {
 825         struct blob_attr *old_config = if_old->config;
 826         bool reload = false, reload_ip = false;
 827
 828 #define FIELD_CHANGED_STR(field)                                        \
 829                 ((!!if_old->field != !!if_new->field) ||                \
 830                  (if_old->field &&                                      \
 831                   strcmp(if_old->field, if_new->field) != 0))
 832
 833         if (FIELD_CHANGED_STR(parent_ifname)) {
 834                 if (if_old->parent_iface.iface)
 835                         interface_remove_user(&if_old->parent_iface);
 836                 reload = true;
 837         }
 838
 839         if (FIELD_CHANGED_STR(ifname) ||
 840             if_old->proto_handler != if_new->proto_handler)
 841                 reload = true;
 842
 843         if (!if_old->proto_handler->config_params)
 844                 D(INTERFACE, "No config parameters for interface '%s'\n",
 845                   if_old->name);
 846         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 847                                        if_old->proto_handler->config_params))
 848                 reload = true;
 849
 850 #define UPDATE(field, __var) ({                                         \
 851                 bool __changed = (if_old->field != if_new->field);      \
 852                 if_old->field = if_new->field;                          \
 853                 __var |= __changed;                                     \
 854         })
 855
 856         if_old->config = if_new->config;
 857         if (!if_old->config_autostart && if_new->config_autostart)
 858                 if_old->autostart = true;
 859
 860         if_old->device_config = if_new->device_config;
 861         if_old->config_autostart = if_new->config_autostart;
 862         if_old->ifname = if_new->ifname;
 863         if_old->parent_ifname = if_new->parent_ifname;
 864         if_old->proto_handler = if_new->proto_handler;
 865
 866         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 867         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 868
 869         UPDATE(metric, reload_ip);
 870         UPDATE(proto_ip.no_defaultroute, reload_ip);
 871         UPDATE(ip4table, reload_ip);
 872         UPDATE(ip6table, reload_ip);
 873         interface_merge_assignment_data(if_old, if_new);
 874
 875 #undef UPDATE
 876
 877         if (reload) {
 878                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 879                   if_old->name);
 880                 interface_clear_errors(if_old);
 881                 set_config_state(if_old, IFC_RELOAD);
 882                 goto out;
 883         }
 884
 885         if (reload_ip) {
 886                 interface_ip_set_enabled(&if_old->config_ip, false);
 887                 interface_ip_set_enabled(&if_old->proto_ip, false);
 888                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 889                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 890         }
 891
 892         interface_write_resolv_conf();
 893
 894 out:
 895         if_new->config = NULL;
 896         interface_cleanup(if_new);
 897         free(old_config);
 898         free(if_new);
 899 }
 900
 901 static void
 902 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 903                  struct vlist_node *node_old)
 904 {
 905         struct interface *if_old = container_of(node_old, struct interface, node);
 906         struct interface *if_new = container_of(node_new, struct interface, node);
 907
 908         if (node_old && node_new) {
 909                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 910                 interface_change_config(if_old, if_new);
 911         } else if (node_old) {
 912                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 913                 set_config_state(if_old, IFC_REMOVE);
 914         } else if (node_new) {
 915                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 916                 proto_init_interface(if_new, if_new->config);
 917                 interface_claim_device(if_new);
 918                 netifd_ubus_add_interface(if_new);
 919         }
 920 }
 921
 922
 923 static void __init
 924 interface_init_list(void)
 925 {
 926         vlist_init(&interfaces, avl_strcmp, interface_update);
 927         interfaces.keep_old = true;
 928         interfaces.no_delete = true;
 929 }