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 static bool default_ps = true;
  33
  34 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  35         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  36         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  38         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  39         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  40         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  41         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  42         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  44         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  45         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  46         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  47         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  48         [DEV_ATTR_RPS] = { .name = "rps", .type = BLOBMSG_TYPE_BOOL },
  49         [DEV_ATTR_XPS] = { .name = "xps", .type = BLOBMSG_TYPE_BOOL },
  50         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  51 };
  52
  53 const struct uci_blob_param_list device_attr_list = {
  54         .n_params = __DEV_ATTR_MAX,
  55         .params = dev_attrs,
  56 };
  57
  58 static int __devlock = 0;
  59
  60 void device_lock(void)
  61 {
  62         __devlock++;
  63 }
  64
  65 void device_unlock(void)
  66 {
  67         __devlock--;
  68         if (!__devlock)
  69                 device_free_unused(NULL);
  70 }
  71
  72 static int set_device_state(struct device *dev, bool state)
  73 {
  74         if (state) {
  75                 /* Set ifindex for all devices being enabled so a valid  */
  76                 /* ifindex is in place avoiding possible race conditions */
  77                 device_set_ifindex(dev, system_if_resolve(dev));
  78                 if (!dev->ifindex)
  79                         return -1;
  80         }
  81
  82         if (dev->external)
  83                 return 0;
  84
  85         if (state)
  86                 system_if_up(dev);
  87         else
  88                 system_if_down(dev);
  89
  90         return 0;
  91 }
  92
  93 static int
  94 simple_device_set_state(struct device *dev, bool state)
  95 {
  96         struct device *pdev;
  97         int ret = 0;
  98
  99         pdev = dev->parent.dev;
 100         if (state && !pdev) {
 101                 pdev = system_if_get_parent(dev);
 102                 if (pdev)
 103                         device_add_user(&dev->parent, pdev);
 104         }
 105
 106         if (pdev) {
 107                 if (state)
 108                         ret = device_claim(&dev->parent);
 109                 else
 110                         device_release(&dev->parent);
 111
 112                 if (ret < 0)
 113                         return ret;
 114         }
 115         return set_device_state(dev, state);
 116 }
 117
 118 static struct device *
 119 simple_device_create(const char *name, struct blob_attr *attr)
 120 {
 121         struct blob_attr *tb[__DEV_ATTR_MAX];
 122         struct device *dev = NULL;
 123
 124         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 125         dev = device_get(name, true);
 126         if (!dev)
 127                 return NULL;
 128
 129         dev->set_state = simple_device_set_state;
 130         device_init_settings(dev, tb);
 131
 132         return dev;
 133 }
 134
 135 static void simple_device_free(struct device *dev)
 136 {
 137         if (dev->parent.dev)
 138                 device_remove_user(&dev->parent);
 139         free(dev);
 140 }
 141
 142 const struct device_type simple_device_type = {
 143         .name = "Network device",
 144         .config_params = &device_attr_list,
 145
 146         .create = simple_device_create,
 147         .check_state = system_if_check,
 148         .free = simple_device_free,
 149 };
 150
 151 static void
 152 device_merge_settings(struct device *dev, struct device_settings *n)
 153 {
 154         struct device_settings *os = &dev->orig_settings;
 155         struct device_settings *s = &dev->settings;
 156
 157         memset(n, 0, sizeof(*n));
 158         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 159         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 160         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 161                 s->txqueuelen : os->txqueuelen;
 162         memcpy(n->macaddr,
 163                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 164                 sizeof(n->macaddr));
 165         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 166         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 167         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 168         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 169         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 170         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 171         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 172                 s->neigh4reachabletime : os->neigh4reachabletime;
 173         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 174                 s->neigh6reachabletime : os->neigh6reachabletime;
 175         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 176                 s->dadtransmits : os->dadtransmits;
 177         n->flags = s->flags | os->flags;
 178 }
 179
 180 void
 181 device_init_settings(struct device *dev, struct blob_attr **tb)
 182 {
 183         struct device_settings *s = &dev->settings;
 184         struct blob_attr *cur;
 185         struct ether_addr *ea;
 186         bool disabled = false;
 187
 188         s->flags = 0;
 189         if ((cur = tb[DEV_ATTR_ENABLED]))
 190                 disabled = !blobmsg_get_bool(cur);
 191
 192         if ((cur = tb[DEV_ATTR_MTU])) {
 193                 s->mtu = blobmsg_get_u32(cur);
 194                 s->flags |= DEV_OPT_MTU;
 195         }
 196
 197         if ((cur = tb[DEV_ATTR_MTU6])) {
 198                 s->mtu6 = blobmsg_get_u32(cur);
 199                 s->flags |= DEV_OPT_MTU6;
 200         }
 201
 202         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 203                 s->txqueuelen = blobmsg_get_u32(cur);
 204                 s->flags |= DEV_OPT_TXQUEUELEN;
 205         }
 206
 207         if ((cur = tb[DEV_ATTR_MACADDR])) {
 208                 ea = ether_aton(blobmsg_data(cur));
 209                 if (ea) {
 210                         memcpy(s->macaddr, ea, 6);
 211                         s->flags |= DEV_OPT_MACADDR;
 212                 }
 213         }
 214
 215         if ((cur = tb[DEV_ATTR_IPV6])) {
 216                 s->ipv6 = blobmsg_get_bool(cur);
 217                 s->flags |= DEV_OPT_IPV6;
 218         }
 219
 220         if ((cur = tb[DEV_ATTR_PROMISC])) {
 221                 s->promisc = blobmsg_get_bool(cur);
 222                 s->flags |= DEV_OPT_PROMISC;
 223         }
 224
 225         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 226                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 227                         s->flags |= DEV_OPT_RPFILTER;
 228                 else
 229                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 230         }
 231
 232         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 233                 s->acceptlocal = blobmsg_get_bool(cur);
 234                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 235         }
 236
 237         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 238                 s->igmpversion = blobmsg_get_u32(cur);
 239                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 240                         s->flags |= DEV_OPT_IGMPVERSION;
 241                 else
 242                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 243         }
 244
 245         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 246                 s->mldversion = blobmsg_get_u32(cur);
 247                 if (s->mldversion >= 1 && s->mldversion <= 2)
 248                         s->flags |= DEV_OPT_MLDVERSION;
 249                 else
 250                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 251         }
 252
 253         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 254                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 255                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 256         }
 257
 258         if ((cur = tb[DEV_ATTR_RPS])) {
 259                 s->rps = blobmsg_get_bool(cur);
 260                 s->flags |= DEV_OPT_RPS;
 261         }
 262         else
 263                 s->rps = default_ps;
 264
 265         if ((cur = tb[DEV_ATTR_XPS])) {
 266                 s->xps = blobmsg_get_bool(cur);
 267                 s->flags |= DEV_OPT_XPS;
 268         }
 269         else
 270                 s->xps = default_ps;
 271
 272         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 273                 s->dadtransmits = blobmsg_get_u32(cur);
 274                 s->flags |= DEV_OPT_DADTRANSMITS;
 275         }
 276
 277         device_set_disabled(dev, disabled);
 278 }
 279
 280 static void __init dev_init(void)
 281 {
 282         avl_init(&devices, avl_strcmp, true, NULL);
 283 }
 284
 285 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 286 {
 287         struct device_user *dep = container_of(list, struct device_user, list);
 288         int *ev = ctx;
 289
 290         /* device might have been removed by an earlier callback */
 291         if (!dep->dev)
 292                 return 0;
 293
 294         if (dep->cb)
 295                 dep->cb(dep, *ev);
 296         return 0;
 297 }
 298
 299 void device_broadcast_event(struct device *dev, enum device_event ev)
 300 {
 301         int dev_ev = ev;
 302
 303         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 304         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 305 }
 306
 307 int device_claim(struct device_user *dep)
 308 {
 309         struct device *dev = dep->dev;
 310         int ret;
 311
 312         if (dep->claimed)
 313                 return 0;
 314
 315         dep->claimed = true;
 316         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 317         if (++dev->active != 1)
 318                 return 0;
 319
 320         device_broadcast_event(dev, DEV_EVENT_SETUP);
 321         ret = dev->set_state(dev, true);
 322         if (ret == 0)
 323                 device_broadcast_event(dev, DEV_EVENT_UP);
 324         else {
 325                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 326                 dev->active = 0;
 327                 dep->claimed = false;
 328         }
 329
 330         return ret;
 331 }
 332
 333 void device_release(struct device_user *dep)
 334 {
 335         struct device *dev = dep->dev;
 336
 337         if (!dep->claimed)
 338                 return;
 339
 340         dep->claimed = false;
 341         dev->active--;
 342         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 343         assert(dev->active >= 0);
 344
 345         if (dev->active)
 346                 return;
 347
 348         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 349         if (!dev->external)
 350                 dev->set_state(dev, false);
 351         device_broadcast_event(dev, DEV_EVENT_DOWN);
 352 }
 353
 354 int device_check_state(struct device *dev)
 355 {
 356         if (!dev->type->check_state)
 357                 return simple_device_type.check_state(dev);
 358
 359         return dev->type->check_state(dev);
 360 }
 361
 362 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 363 {
 364         assert(dev);
 365         assert(type);
 366
 367         if (name)
 368                 strncpy(dev->ifname, name, IFNAMSIZ);
 369
 370         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 371         INIT_SAFE_LIST(&dev->users);
 372         INIT_SAFE_LIST(&dev->aliases);
 373         dev->type = type;
 374
 375         if (!dev->set_state)
 376                 dev->set_state = set_device_state;
 377 }
 378
 379 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 380 {
 381         int ret;
 382
 383         device_init_virtual(dev, type, ifname);
 384
 385         dev->avl.key = dev->ifname;
 386
 387         ret = avl_insert(&devices, &dev->avl);
 388         if (ret < 0)
 389                 return ret;
 390
 391         system_if_clear_state(dev);
 392         device_check_state(dev);
 393         dev->settings.rps = default_ps;
 394         dev->settings.xps = default_ps;
 395
 396         return 0;
 397 }
 398
 399 static struct device *
 400 device_create_default(const char *name, bool external)
 401 {
 402         struct device *dev;
 403
 404         if (!external && system_if_force_external(name))
 405                 return NULL;
 406
 407         D(DEVICE, "Create simple device '%s'\n", name);
 408         dev = calloc(1, sizeof(*dev));
 409         dev->external = external;
 410         dev->set_state = simple_device_set_state;
 411         device_init(dev, &simple_device_type, name);
 412         dev->default_config = true;
 413         if (external)
 414                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 415         return dev;
 416 }
 417
 418 struct device *
 419 device_get(const char *name, int create)
 420 {
 421         struct device *dev;
 422
 423         if (strchr(name, '.'))
 424                 return get_vlan_device_chain(name, create);
 425
 426         if (name[0] == '@')
 427                 return device_alias_get(name + 1);
 428
 429         dev = avl_find_element(&devices, name, dev, avl);
 430         if (dev) {
 431                 if (create > 1 && !dev->external) {
 432                         dev->external = true;
 433                         device_set_present(dev, true);
 434                 }
 435                 return dev;
 436         }
 437
 438         if (!create)
 439                 return NULL;
 440
 441         return device_create_default(name, create > 1);
 442 }
 443
 444 static void
 445 device_delete(struct device *dev)
 446 {
 447         if (!dev->avl.key)
 448                 return;
 449
 450         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 451         avl_delete(&devices, &dev->avl);
 452         dev->avl.key = NULL;
 453 }
 454
 455 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 456 {
 457         struct device_user *dep = container_of(list, struct device_user, list);
 458         if (dep->cb)
 459                 dep->cb(dep, DEV_EVENT_REMOVE);
 460
 461         device_release(dep);
 462         return 0;
 463 }
 464
 465 void device_cleanup(struct device *dev)
 466 {
 467         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 468         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 469         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 470         device_delete(dev);
 471 }
 472
 473 static void __device_set_present(struct device *dev, bool state)
 474 {
 475         if (dev->present == state)
 476                 return;
 477
 478         dev->present = state;
 479         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 480 }
 481
 482 void
 483 device_refresh_present(struct device *dev)
 484 {
 485         bool state = dev->sys_present;
 486
 487         if (dev->disabled || dev->deferred)
 488                 state = false;
 489
 490         __device_set_present(dev, state);
 491 }
 492
 493 void device_set_present(struct device *dev, bool state)
 494 {
 495         if (dev->sys_present == state)
 496                 return;
 497
 498         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 499         dev->sys_present = state;
 500         device_refresh_present(dev);
 501 }
 502
 503 void device_set_link(struct device *dev, bool state)
 504 {
 505         if (dev->link_active == state)
 506                 return;
 507
 508         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 509
 510         dev->link_active = state;
 511         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 512 }
 513
 514 void device_set_ifindex(struct device *dev, int ifindex)
 515 {
 516         if (dev->ifindex == ifindex)
 517                 return;
 518
 519         dev->ifindex = ifindex;
 520         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 521 }
 522
 523 static int device_refcount(struct device *dev)
 524 {
 525         struct list_head *list;
 526         int count = 0;
 527
 528         list_for_each(list, &dev->users.list)
 529                 count++;
 530
 531         list_for_each(list, &dev->aliases.list)
 532                 count++;
 533
 534         return count;
 535 }
 536
 537 void device_add_user(struct device_user *dep, struct device *dev)
 538 {
 539         struct safe_list *head;
 540
 541         if (dep->dev == dev)
 542                 return;
 543
 544         if (dep->dev)
 545                 device_remove_user(dep);
 546
 547         if (!dev)
 548                 return;
 549
 550         dep->dev = dev;
 551
 552         if (dep->alias)
 553                 head = &dev->aliases;
 554         else
 555                 head = &dev->users;
 556
 557         safe_list_add(&dep->list, head);
 558         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 559
 560         if (dep->cb && dev->present) {
 561                 dep->cb(dep, DEV_EVENT_ADD);
 562                 if (dev->active)
 563                         dep->cb(dep, DEV_EVENT_UP);
 564
 565                 if (dev->link_active)
 566                         dep->cb(dep, DEV_EVENT_LINK_UP);
 567         }
 568 }
 569
 570 void
 571 device_free(struct device *dev)
 572 {
 573         __devlock++;
 574         free(dev->config);
 575         device_cleanup(dev);
 576         dev->type->free(dev);
 577         __devlock--;
 578 }
 579
 580 static void
 581 __device_free_unused(struct device *dev)
 582 {
 583         if (!safe_list_empty(&dev->users) ||
 584                 !safe_list_empty(&dev->aliases) ||
 585             dev->current_config || __devlock)
 586                 return;
 587
 588         device_free(dev);
 589 }
 590
 591 void device_remove_user(struct device_user *dep)
 592 {
 593         struct device *dev = dep->dev;
 594
 595         if (!dep->dev)
 596                 return;
 597
 598         dep->hotplug = false;
 599         if (dep->claimed)
 600                 device_release(dep);
 601
 602         safe_list_del(&dep->list);
 603         dep->dev = NULL;
 604         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 605         __device_free_unused(dev);
 606 }
 607
 608 void
 609 device_free_unused(struct device *dev)
 610 {
 611         struct device *tmp;
 612
 613         if (dev)
 614                 return __device_free_unused(dev);
 615
 616         avl_for_each_element_safe(&devices, dev, avl, tmp)
 617                 __device_free_unused(dev);
 618 }
 619
 620 void
 621 device_init_pending(void)
 622 {
 623         struct device *dev, *tmp;
 624
 625         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 626                 if (!dev->config_pending)
 627                         continue;
 628
 629                 dev->type->config_init(dev);
 630                 dev->config_pending = false;
 631         }
 632 }
 633
 634 static enum dev_change_type
 635 device_set_config(struct device *dev, const struct device_type *type,
 636                   struct blob_attr *attr)
 637 {
 638         struct blob_attr *tb[__DEV_ATTR_MAX];
 639         const struct uci_blob_param_list *cfg = type->config_params;
 640
 641         if (type != dev->type)
 642                 return DEV_CONFIG_RECREATE;
 643
 644         if (dev->type->reload)
 645                 return dev->type->reload(dev, attr);
 646
 647         if (uci_blob_check_equal(dev->config, attr, cfg))
 648                 return DEV_CONFIG_NO_CHANGE;
 649
 650         if (cfg == &device_attr_list) {
 651                 memset(tb, 0, sizeof(tb));
 652
 653                 if (attr)
 654                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 655                                 blob_data(attr), blob_len(attr));
 656
 657                 device_init_settings(dev, tb);
 658                 return DEV_CONFIG_RESTART;
 659         } else
 660                 return DEV_CONFIG_RECREATE;
 661 }
 662
 663 enum dev_change_type
 664 device_apply_config(struct device *dev, const struct device_type *type,
 665                     struct blob_attr *config)
 666 {
 667         enum dev_change_type change;
 668
 669         change = device_set_config(dev, type, config);
 670         if (dev->external) {
 671                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 672                 change = DEV_CONFIG_APPLIED;
 673         }
 674
 675         switch (change) {
 676                 case DEV_CONFIG_RESTART:
 677                 case DEV_CONFIG_APPLIED:
 678                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 679                         config = blob_memdup(config);
 680                         free(dev->config);
 681                         dev->config = config;
 682                         if (change == DEV_CONFIG_RESTART && dev->present) {
 683                                 device_set_present(dev, false);
 684                                 if (dev->active && !dev->external) {
 685                                         dev->set_state(dev, false);
 686                                         dev->set_state(dev, true);
 687                                 }
 688                                 device_set_present(dev, true);
 689                         }
 690                         break;
 691                 case DEV_CONFIG_NO_CHANGE:
 692                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 693                         break;
 694                 case DEV_CONFIG_RECREATE:
 695                         break;
 696         }
 697
 698         return change;
 699 }
 700
 701 static void
 702 device_replace(struct device *dev, struct device *odev)
 703 {
 704         struct device_user *dep, *tmp;
 705
 706         __devlock++;
 707         if (odev->present)
 708                 device_set_present(odev, false);
 709
 710         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 711                 device_release(dep);
 712                 safe_list_del(&dep->list);
 713                 safe_list_add(&dep->list, &dev->users);
 714                 dep->dev = dev;
 715         }
 716         __devlock--;
 717
 718         device_free(odev);
 719 }
 720
 721 void
 722 device_reset_config(void)
 723 {
 724         struct device *dev;
 725
 726         avl_for_each_element(&devices, dev, avl)
 727                 dev->current_config = false;
 728 }
 729
 730 void
 731 device_reset_old(void)
 732 {
 733         struct device *dev, *tmp, *ndev;
 734
 735         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 736                 if (dev->current_config || dev->default_config)
 737                         continue;
 738
 739                 if (dev->type != &simple_device_type)
 740                         continue;
 741
 742                 ndev = device_create_default(dev->ifname, dev->external);
 743                 if (!ndev)
 744                         continue;
 745
 746                 device_replace(ndev, dev);
 747         }
 748 }
 749
 750 void
 751 device_set_default_ps(bool state)
 752 {
 753         struct device *dev;
 754
 755         if (state == default_ps)
 756                 return;
 757
 758         default_ps = state;
 759
 760         avl_for_each_element(&devices, dev, avl) {
 761                 struct device_settings *s = &dev->settings;
 762                 unsigned int apply_mask = 0;
 763
 764                 if (!(s->flags & DEV_OPT_RPS)) {
 765                         s->rps = default_ps;
 766                         apply_mask |= DEV_OPT_RPS;
 767                 }
 768
 769                 if (!(s->flags & DEV_OPT_XPS)) {
 770                         s->xps = default_ps;
 771                         apply_mask |= DEV_OPT_XPS;
 772                 }
 773
 774                 if (!apply_mask)
 775                         continue;
 776
 777                 if (!(dev->external || (dev->present && dev->active)) ||
 778                                 dev->config_pending)
 779                         continue;
 780
 781                 system_if_apply_settings(dev, s, apply_mask);
 782         }
 783 }
 784
 785 struct device *
 786 device_create(const char *name, const struct device_type *type,
 787               struct blob_attr *config)
 788 {
 789         struct device *odev = NULL, *dev;
 790         enum dev_change_type change;
 791
 792         odev = device_get(name, false);
 793         if (odev) {
 794                 odev->current_config = true;
 795                 change = device_apply_config(odev, type, config);
 796                 switch (change) {
 797                 case DEV_CONFIG_RECREATE:
 798                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 799                         device_delete(odev);
 800                         break;
 801                 default:
 802                         return odev;
 803                 }
 804         } else
 805                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 806
 807         config = blob_memdup(config);
 808         if (!config)
 809                 return NULL;
 810
 811         dev = type->create(name, config);
 812         if (!dev)
 813                 return NULL;
 814
 815         dev->current_config = true;
 816         dev->config = config;
 817         if (odev)
 818                 device_replace(dev, odev);
 819
 820         if (!config_init && dev->config_pending) {
 821                 type->config_init(dev);
 822                 dev->config_pending = false;
 823         }
 824
 825         return dev;
 826 }
 827
 828 void
 829 device_dump_status(struct blob_buf *b, struct device *dev)
 830 {
 831         struct device_settings st;
 832         void *c, *s;
 833
 834         if (!dev) {
 835                 avl_for_each_element(&devices, dev, avl) {
 836                         if (!dev->present)
 837                                 continue;
 838                         c = blobmsg_open_table(b, dev->ifname);
 839                         device_dump_status(b, dev);
 840                         blobmsg_close_table(b, c);
 841                 }
 842
 843                 return;
 844         }
 845
 846         blobmsg_add_u8(b, "external", dev->external);
 847         blobmsg_add_u8(b, "present", dev->present);
 848         blobmsg_add_string(b, "type", dev->type->name);
 849
 850         if (!dev->present)
 851                 return;
 852
 853         blobmsg_add_u8(b, "up", !!dev->active);
 854         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 855
 856         if (dev->type->dump_info)
 857                 dev->type->dump_info(dev, b);
 858         else
 859                 system_if_dump_info(dev, b);
 860
 861         if (dev->active) {
 862                 device_merge_settings(dev, &st);
 863                 if (st.flags & DEV_OPT_MTU)
 864                         blobmsg_add_u32(b, "mtu", st.mtu);
 865                 if (st.flags & DEV_OPT_MTU6)
 866                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 867                 if (st.flags & DEV_OPT_MACADDR)
 868                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 869                 if (st.flags & DEV_OPT_TXQUEUELEN)
 870                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 871                 if (st.flags & DEV_OPT_IPV6)
 872                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 873                 if (st.flags & DEV_OPT_PROMISC)
 874                         blobmsg_add_u8(b, "promisc", st.promisc);
 875                 if (st.flags & DEV_OPT_RPFILTER)
 876                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 877                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 878                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 879                 if (st.flags & DEV_OPT_IGMPVERSION)
 880                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 881                 if (st.flags & DEV_OPT_MLDVERSION)
 882                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 883                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 884                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 885                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 886                 }
 887                 if (st.flags & DEV_OPT_DADTRANSMITS)
 888                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 889         }
 890
 891         s = blobmsg_open_table(b, "statistics");
 892         if (dev->type->dump_stats)
 893                 dev->type->dump_stats(dev, b);
 894         else
 895                 system_if_dump_stats(dev, b);
 896         blobmsg_close_table(b, s);
 897 }