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