device.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 <assert.h>
  18
  19 #include <sys/types.h>
  20 #include <sys/socket.h>
  21 #include <net/ethernet.h>
  22
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26
  27 #include "netifd.h"
  28 #include "system.h"
  29 #include "config.h"
  30
  31 static struct avl_tree devices;
  32
  33 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  34         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  35         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  36         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  37         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  38         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  39         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  40         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  41         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  42         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  44         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  45         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  46         [DEV_ATTR_RPS] = { .name = "rps", .type = BLOBMSG_TYPE_BOOL },
  47         [DEV_ATTR_XPS] = { .name = "xps", .type = BLOBMSG_TYPE_BOOL },
  48 };
  49
  50 const struct uci_blob_param_list device_attr_list = {
  51         .n_params = __DEV_ATTR_MAX,
  52         .params = dev_attrs,
  53 };
  54
  55 static int __devlock = 0;
  56
  57 void device_lock(void)
  58 {
  59         __devlock++;
  60 }
  61
  62 void device_unlock(void)
  63 {
  64         __devlock--;
  65         if (!__devlock)
  66                 device_free_unused(NULL);
  67 }
  68
  69 static int set_device_state(struct device *dev, bool state)
  70 {
  71         if (state) {
  72                 /* Set ifindex for all devices being enabled so a valid  */
  73                 /* ifindex is in place avoiding possible race conditions */
  74                 device_set_ifindex(dev, system_if_resolve(dev));
  75                 if (!dev->ifindex)
  76                         return -1;
  77         }
  78
  79         if (dev->external)
  80                 return 0;
  81
  82         if (state)
  83                 system_if_up(dev);
  84         else
  85                 system_if_down(dev);
  86
  87         return 0;
  88 }
  89
  90 static int
  91 simple_device_set_state(struct device *dev, bool state)
  92 {
  93         struct device *pdev;
  94         int ret = 0;
  95
  96         pdev = dev->parent.dev;
  97         if (state && !pdev) {
  98                 pdev = system_if_get_parent(dev);
  99                 if (pdev)
 100                         device_add_user(&dev->parent, pdev);
 101         }
 102
 103         if (pdev) {
 104                 if (state)
 105                         ret = device_claim(&dev->parent);
 106                 else
 107                         device_release(&dev->parent);
 108
 109                 if (ret < 0)
 110                         return ret;
 111         }
 112         return set_device_state(dev, state);
 113 }
 114
 115 static struct device *
 116 simple_device_create(const char *name, struct blob_attr *attr)
 117 {
 118         struct blob_attr *tb[__DEV_ATTR_MAX];
 119         struct device *dev = NULL;
 120
 121         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 122         dev = device_get(name, true);
 123         if (!dev)
 124                 return NULL;
 125
 126         dev->set_state = simple_device_set_state;
 127         device_init_settings(dev, tb);
 128
 129         return dev;
 130 }
 131
 132 static void simple_device_free(struct device *dev)
 133 {
 134         if (dev->parent.dev)
 135                 device_remove_user(&dev->parent);
 136         free(dev);
 137 }
 138
 139 const struct device_type simple_device_type = {
 140         .name = "Network device",
 141         .config_params = &device_attr_list,
 142
 143         .create = simple_device_create,
 144         .check_state = system_if_check,
 145         .free = simple_device_free,
 146 };
 147
 148 static void
 149 device_merge_settings(struct device *dev, struct device_settings *n)
 150 {
 151         struct device_settings *os = &dev->orig_settings;
 152         struct device_settings *s = &dev->settings;
 153
 154         memset(n, 0, sizeof(*n));
 155         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 156         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 157                 s->txqueuelen : os->txqueuelen;
 158         memcpy(n->macaddr,
 159                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 160                 sizeof(n->macaddr));
 161         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 162         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 163         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 164         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 165         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 166         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 167         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 168                 s->neigh4reachabletime : os->neigh4reachabletime;
 169         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 170                         s->neigh6reachabletime : os->neigh6reachabletime;
 171         n->flags = s->flags | os->flags;
 172 }
 173
 174 void
 175 device_init_settings(struct device *dev, struct blob_attr **tb)
 176 {
 177         struct device_settings *s = &dev->settings;
 178         struct blob_attr *cur;
 179         struct ether_addr *ea;
 180         bool disabled = false;
 181
 182         s->flags = 0;
 183         if ((cur = tb[DEV_ATTR_ENABLED]))
 184                 disabled = !blobmsg_get_bool(cur);
 185
 186         if ((cur = tb[DEV_ATTR_MTU])) {
 187                 s->mtu = blobmsg_get_u32(cur);
 188                 s->flags |= DEV_OPT_MTU;
 189         }
 190
 191         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 192                 s->txqueuelen = blobmsg_get_u32(cur);
 193                 s->flags |= DEV_OPT_TXQUEUELEN;
 194         }
 195
 196         if ((cur = tb[DEV_ATTR_MACADDR])) {
 197                 ea = ether_aton(blobmsg_data(cur));
 198                 if (ea) {
 199                         memcpy(s->macaddr, ea, 6);
 200                         s->flags |= DEV_OPT_MACADDR;
 201                 }
 202         }
 203
 204         if ((cur = tb[DEV_ATTR_IPV6])) {
 205                 s->ipv6 = blobmsg_get_bool(cur);
 206                 s->flags |= DEV_OPT_IPV6;
 207         }
 208
 209         if ((cur = tb[DEV_ATTR_PROMISC])) {
 210                 s->promisc = blobmsg_get_bool(cur);
 211                 s->flags |= DEV_OPT_PROMISC;
 212         }
 213
 214         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 215                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 216                         s->flags |= DEV_OPT_RPFILTER;
 217                 else
 218                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 219         }
 220
 221         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 222                 s->acceptlocal = blobmsg_get_bool(cur);
 223                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 224         }
 225
 226         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 227                 s->igmpversion = blobmsg_get_u32(cur);
 228                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 229                         s->flags |= DEV_OPT_IGMPVERSION;
 230                 else
 231                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 232         }
 233
 234         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 235                 s->mldversion = blobmsg_get_u32(cur);
 236                 if (s->mldversion >= 1 && s->mldversion <= 2)
 237                         s->flags |= DEV_OPT_MLDVERSION;
 238                 else
 239                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 240         }
 241
 242         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 243                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 244                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 245         }
 246
 247         if ((cur = tb[DEV_ATTR_RPS]))
 248                 s->rps = blobmsg_get_bool(cur);
 249         else
 250                 s->rps = true;
 251
 252         if ((cur = tb[DEV_ATTR_XPS]))
 253                 s->xps = blobmsg_get_bool(cur);
 254         else
 255                 s->xps = true;
 256
 257         device_set_disabled(dev, disabled);
 258 }
 259
 260 static void __init dev_init(void)
 261 {
 262         avl_init(&devices, avl_strcmp, true, NULL);
 263 }
 264
 265 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 266 {
 267         struct device_user *dep = container_of(list, struct device_user, list);
 268         int *ev = ctx;
 269
 270         /* device might have been removed by an earlier callback */
 271         if (!dep->dev)
 272                 return 0;
 273
 274         if (dep->cb)
 275                 dep->cb(dep, *ev);
 276         return 0;
 277 }
 278
 279 void device_broadcast_event(struct device *dev, enum device_event ev)
 280 {
 281         int dev_ev = ev;
 282
 283         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 284         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 285 }
 286
 287 int device_claim(struct device_user *dep)
 288 {
 289         struct device *dev = dep->dev;
 290         int ret;
 291
 292         if (dep->claimed)
 293                 return 0;
 294
 295         dep->claimed = true;
 296         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 297         if (++dev->active != 1)
 298                 return 0;
 299
 300         device_broadcast_event(dev, DEV_EVENT_SETUP);
 301         ret = dev->set_state(dev, true);
 302         if (ret == 0)
 303                 device_broadcast_event(dev, DEV_EVENT_UP);
 304         else {
 305                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 306                 dev->active = 0;
 307                 dep->claimed = false;
 308         }
 309
 310         return ret;
 311 }
 312
 313 void device_release(struct device_user *dep)
 314 {
 315         struct device *dev = dep->dev;
 316
 317         if (!dep->claimed)
 318                 return;
 319
 320         dep->claimed = false;
 321         dev->active--;
 322         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 323         assert(dev->active >= 0);
 324
 325         if (dev->active)
 326                 return;
 327
 328         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 329         if (!dev->external)
 330                 dev->set_state(dev, false);
 331         device_broadcast_event(dev, DEV_EVENT_DOWN);
 332 }
 333
 334 int device_check_state(struct device *dev)
 335 {
 336         if (!dev->type->check_state)
 337                 return simple_device_type.check_state(dev);
 338
 339         return dev->type->check_state(dev);
 340 }
 341
 342 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 343 {
 344         assert(dev);
 345         assert(type);
 346
 347         if (name)
 348                 strncpy(dev->ifname, name, IFNAMSIZ);
 349
 350         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 351         INIT_SAFE_LIST(&dev->users);
 352         INIT_SAFE_LIST(&dev->aliases);
 353         dev->type = type;
 354
 355         if (!dev->set_state)
 356                 dev->set_state = set_device_state;
 357 }
 358
 359 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 360 {
 361         int ret;
 362
 363         device_init_virtual(dev, type, ifname);
 364
 365         dev->avl.key = dev->ifname;
 366
 367         ret = avl_insert(&devices, &dev->avl);
 368         if (ret < 0)
 369                 return ret;
 370
 371         system_if_clear_state(dev);
 372         device_check_state(dev);
 373         dev->settings.rps = true;
 374         dev->settings.xps = true;
 375
 376         return 0;
 377 }
 378
 379 static struct device *
 380 device_create_default(const char *name, bool external)
 381 {
 382         struct device *dev;
 383
 384         if (!external && system_if_force_external(name))
 385                 return NULL;
 386
 387         D(DEVICE, "Create simple device '%s'\n", name);
 388         dev = calloc(1, sizeof(*dev));
 389         dev->external = external;
 390         dev->set_state = simple_device_set_state;
 391         device_init(dev, &simple_device_type, name);
 392         dev->default_config = true;
 393         return dev;
 394 }
 395
 396 struct device *
 397 device_get(const char *name, int create)
 398 {
 399         struct device *dev;
 400
 401         if (strchr(name, '.'))
 402                 return get_vlan_device_chain(name, create);
 403
 404         if (name[0] == '@')
 405                 return device_alias_get(name + 1);
 406
 407         dev = avl_find_element(&devices, name, dev, avl);
 408         if (dev) {
 409                 if (create > 1 && !dev->external) {
 410                         dev->external = true;
 411                         device_set_present(dev, true);
 412                 }
 413                 return dev;
 414         }
 415
 416         if (!create)
 417                 return NULL;
 418
 419         return device_create_default(name, create > 1);
 420 }
 421
 422 static void
 423 device_delete(struct device *dev)
 424 {
 425         if (!dev->avl.key)
 426                 return;
 427
 428         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 429         avl_delete(&devices, &dev->avl);
 430         dev->avl.key = NULL;
 431 }
 432
 433 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 434 {
 435         struct device_user *dep = container_of(list, struct device_user, list);
 436         if (dep->cb)
 437                 dep->cb(dep, DEV_EVENT_REMOVE);
 438
 439         device_release(dep);
 440         return 0;
 441 }
 442
 443 void device_cleanup(struct device *dev)
 444 {
 445         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 446         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 447         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 448         device_delete(dev);
 449 }
 450
 451 static void __device_set_present(struct device *dev, bool state)
 452 {
 453         if (dev->present == state)
 454                 return;
 455
 456         dev->present = state;
 457         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 458 }
 459
 460 void
 461 device_refresh_present(struct device *dev)
 462 {
 463         bool state = dev->sys_present;
 464
 465         if (dev->disabled || dev->deferred)
 466                 state = false;
 467
 468         __device_set_present(dev, state);
 469 }
 470
 471 void device_set_present(struct device *dev, bool state)
 472 {
 473         if (dev->sys_present == state)
 474                 return;
 475
 476         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 477         dev->sys_present = state;
 478         device_refresh_present(dev);
 479 }
 480
 481 void device_set_link(struct device *dev, bool state)
 482 {
 483         if (dev->link_active == state)
 484                 return;
 485
 486         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 487
 488         dev->link_active = state;
 489         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 490 }
 491
 492 void device_set_ifindex(struct device *dev, int ifindex)
 493 {
 494         if (dev->ifindex == ifindex)
 495                 return;
 496
 497         dev->ifindex = ifindex;
 498         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 499 }
 500
 501 static int device_refcount(struct device *dev)
 502 {
 503         struct list_head *list;
 504         int count = 0;
 505
 506         list_for_each(list, &dev->users.list)
 507                 count++;
 508
 509         list_for_each(list, &dev->aliases.list)
 510                 count++;
 511
 512         return count;
 513 }
 514
 515 void device_add_user(struct device_user *dep, struct device *dev)
 516 {
 517         struct safe_list *head;
 518
 519         if (dep->dev == dev)
 520                 return;
 521
 522         if (dep->dev)
 523                 device_remove_user(dep);
 524
 525         if (!dev)
 526                 return;
 527
 528         dep->dev = dev;
 529
 530         if (dep->alias)
 531                 head = &dev->aliases;
 532         else
 533                 head = &dev->users;
 534
 535         safe_list_add(&dep->list, head);
 536         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 537
 538         if (dep->cb && dev->present) {
 539                 dep->cb(dep, DEV_EVENT_ADD);
 540                 if (dev->active)
 541                         dep->cb(dep, DEV_EVENT_UP);
 542
 543                 if (dev->link_active)
 544                         dep->cb(dep, DEV_EVENT_LINK_UP);
 545         }
 546 }
 547
 548 void
 549 device_free(struct device *dev)
 550 {
 551         __devlock++;
 552         free(dev->config);
 553         device_cleanup(dev);
 554         dev->type->free(dev);
 555         __devlock--;
 556 }
 557
 558 static void
 559 __device_free_unused(struct device *dev)
 560 {
 561         if (!safe_list_empty(&dev->users) ||
 562                 !safe_list_empty(&dev->aliases) ||
 563             dev->current_config || __devlock)
 564                 return;
 565
 566         device_free(dev);
 567 }
 568
 569 void device_remove_user(struct device_user *dep)
 570 {
 571         struct device *dev = dep->dev;
 572
 573         if (!dep->dev)
 574                 return;
 575
 576         dep->hotplug = false;
 577         if (dep->claimed)
 578                 device_release(dep);
 579
 580         safe_list_del(&dep->list);
 581         dep->dev = NULL;
 582         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 583         __device_free_unused(dev);
 584 }
 585
 586 void
 587 device_free_unused(struct device *dev)
 588 {
 589         struct device *tmp;
 590
 591         if (dev)
 592                 return __device_free_unused(dev);
 593
 594         avl_for_each_element_safe(&devices, dev, avl, tmp)
 595                 __device_free_unused(dev);
 596 }
 597
 598 void
 599 device_init_pending(void)
 600 {
 601         struct device *dev, *tmp;
 602
 603         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 604                 if (!dev->config_pending)
 605                         continue;
 606
 607                 dev->type->config_init(dev);
 608                 dev->config_pending = false;
 609         }
 610 }
 611
 612 static enum dev_change_type
 613 device_set_config(struct device *dev, const struct device_type *type,
 614                   struct blob_attr *attr)
 615 {
 616         struct blob_attr *tb[__DEV_ATTR_MAX];
 617         const struct uci_blob_param_list *cfg = type->config_params;
 618
 619         if (type != dev->type)
 620                 return DEV_CONFIG_RECREATE;
 621
 622         if (dev->type->reload)
 623                 return dev->type->reload(dev, attr);
 624
 625         if (uci_blob_check_equal(dev->config, attr, cfg))
 626                 return DEV_CONFIG_NO_CHANGE;
 627
 628         if (cfg == &device_attr_list) {
 629                 memset(tb, 0, sizeof(tb));
 630
 631                 if (attr)
 632                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 633                                 blob_data(attr), blob_len(attr));
 634
 635                 device_init_settings(dev, tb);
 636                 return DEV_CONFIG_RESTART;
 637         } else
 638                 return DEV_CONFIG_RECREATE;
 639 }
 640
 641 enum dev_change_type
 642 device_apply_config(struct device *dev, const struct device_type *type,
 643                     struct blob_attr *config)
 644 {
 645         enum dev_change_type change;
 646
 647         change = device_set_config(dev, type, config);
 648         if (dev->external) {
 649                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 650                 change = DEV_CONFIG_APPLIED;
 651         }
 652
 653         switch (change) {
 654                 case DEV_CONFIG_RESTART:
 655                 case DEV_CONFIG_APPLIED:
 656                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 657                         config = blob_memdup(config);
 658                         free(dev->config);
 659                         dev->config = config;
 660                         if (change == DEV_CONFIG_RESTART && dev->present) {
 661                                 device_set_present(dev, false);
 662                                 if (dev->active && !dev->external) {
 663                                         dev->set_state(dev, false);
 664                                         dev->set_state(dev, true);
 665                                 }
 666                                 device_set_present(dev, true);
 667                         }
 668                         break;
 669                 case DEV_CONFIG_NO_CHANGE:
 670                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 671                         break;
 672                 case DEV_CONFIG_RECREATE:
 673                         break;
 674         }
 675
 676         return change;
 677 }
 678
 679 static void
 680 device_replace(struct device *dev, struct device *odev)
 681 {
 682         struct device_user *dep, *tmp;
 683         bool present = odev->present;
 684
 685         if (present)
 686                 device_set_present(odev, false);
 687
 688         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 689                 device_release(dep);
 690                 safe_list_del(&dep->list);
 691                 safe_list_add(&dep->list, &dev->users);
 692                 dep->dev = dev;
 693         }
 694         device_free(odev);
 695
 696         if (present)
 697                 device_set_present(dev, true);
 698 }
 699
 700 void
 701 device_reset_config(void)
 702 {
 703         struct device *dev;
 704
 705         avl_for_each_element(&devices, dev, avl)
 706                 dev->current_config = false;
 707 }
 708
 709 void
 710 device_reset_old(void)
 711 {
 712         struct device *dev, *tmp, *ndev;
 713
 714         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 715                 if (dev->current_config || dev->default_config)
 716                         continue;
 717
 718                 if (dev->type != &simple_device_type)
 719                         continue;
 720
 721                 ndev = device_create_default(dev->ifname, dev->external);
 722                 device_replace(ndev, dev);
 723         }
 724 }
 725
 726 struct device *
 727 device_create(const char *name, const struct device_type *type,
 728               struct blob_attr *config)
 729 {
 730         struct device *odev = NULL, *dev;
 731         enum dev_change_type change;
 732
 733         odev = device_get(name, false);
 734         if (odev) {
 735                 odev->current_config = true;
 736                 change = device_apply_config(odev, type, config);
 737                 switch (change) {
 738                 case DEV_CONFIG_RECREATE:
 739                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 740                         device_delete(odev);
 741                         break;
 742                 default:
 743                         return odev;
 744                 }
 745         } else
 746                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 747
 748         config = blob_memdup(config);
 749         if (!config)
 750                 return NULL;
 751
 752         dev = type->create(name, config);
 753         if (!dev)
 754                 return NULL;
 755
 756         dev->current_config = true;
 757         dev->config = config;
 758         if (odev)
 759                 device_replace(dev, odev);
 760
 761         if (!config_init && dev->config_pending)
 762                 type->config_init(dev);
 763
 764         return dev;
 765 }
 766
 767 void
 768 device_dump_status(struct blob_buf *b, struct device *dev)
 769 {
 770         struct device_settings st;
 771         void *c, *s;
 772
 773         if (!dev) {
 774                 avl_for_each_element(&devices, dev, avl) {
 775                         if (!dev->present)
 776                                 continue;
 777                         c = blobmsg_open_table(b, dev->ifname);
 778                         device_dump_status(b, dev);
 779                         blobmsg_close_table(b, c);
 780                 }
 781
 782                 return;
 783         }
 784
 785         blobmsg_add_u8(b, "external", dev->external);
 786         blobmsg_add_u8(b, "present", dev->present);
 787         blobmsg_add_string(b, "type", dev->type->name);
 788
 789         if (!dev->present)
 790                 return;
 791
 792         blobmsg_add_u8(b, "up", !!dev->active);
 793         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 794
 795         if (dev->type->dump_info)
 796                 dev->type->dump_info(dev, b);
 797         else
 798                 system_if_dump_info(dev, b);
 799
 800         if (dev->active) {
 801                 device_merge_settings(dev, &st);
 802                 if (st.flags & DEV_OPT_MTU)
 803                         blobmsg_add_u32(b, "mtu", st.mtu);
 804                 if (st.flags & DEV_OPT_MACADDR)
 805                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 806                 if (st.flags & DEV_OPT_TXQUEUELEN)
 807                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 808                 if (st.flags & DEV_OPT_IPV6)
 809                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 810                 if (st.flags & DEV_OPT_PROMISC)
 811                         blobmsg_add_u8(b, "promisc", st.promisc);
 812                 if (st.flags & DEV_OPT_RPFILTER)
 813                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 814                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 815                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 816                 if (st.flags & DEV_OPT_IGMPVERSION)
 817                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 818                 if (st.flags & DEV_OPT_MLDVERSION)
 819                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 820                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 821                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 822                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 823                 }
 824         }
 825
 826         s = blobmsg_open_table(b, "statistics");
 827         if (dev->type->dump_stats)
 828                 dev->type->dump_stats(dev, b);
 829         else
 830                 system_if_dump_stats(dev, b);
 831         blobmsg_close_table(b, s);
 832 }