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         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  52         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  53 };
  54
  55 const struct uci_blob_param_list device_attr_list = {
  56         .n_params = __DEV_ATTR_MAX,
  57         .params = dev_attrs,
  58 };
  59
  60 static int __devlock = 0;
  61
  62 void device_lock(void)
  63 {
  64         __devlock++;
  65 }
  66
  67 void device_unlock(void)
  68 {
  69         __devlock--;
  70         if (!__devlock)
  71                 device_free_unused(NULL);
  72 }
  73
  74 static int set_device_state(struct device *dev, bool state)
  75 {
  76         if (state) {
  77                 /* Set ifindex for all devices being enabled so a valid  */
  78                 /* ifindex is in place avoiding possible race conditions */
  79                 device_set_ifindex(dev, system_if_resolve(dev));
  80                 if (!dev->ifindex)
  81                         return -1;
  82         }
  83
  84         if (dev->external)
  85                 return 0;
  86
  87         if (state)
  88                 system_if_up(dev);
  89         else
  90                 system_if_down(dev);
  91
  92         return 0;
  93 }
  94
  95 static int
  96 simple_device_set_state(struct device *dev, bool state)
  97 {
  98         struct device *pdev;
  99         int ret = 0;
 100
 101         pdev = dev->parent.dev;
 102         if (state && !pdev) {
 103                 pdev = system_if_get_parent(dev);
 104                 if (pdev)
 105                         device_add_user(&dev->parent, pdev);
 106         }
 107
 108         if (pdev) {
 109                 if (state)
 110                         ret = device_claim(&dev->parent);
 111                 else
 112                         device_release(&dev->parent);
 113
 114                 if (ret < 0)
 115                         return ret;
 116         }
 117         return set_device_state(dev, state);
 118 }
 119
 120 static struct device *
 121 simple_device_create(const char *name, struct blob_attr *attr)
 122 {
 123         struct blob_attr *tb[__DEV_ATTR_MAX];
 124         struct device *dev = NULL;
 125
 126         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 127         dev = device_get(name, true);
 128         if (!dev)
 129                 return NULL;
 130
 131         dev->set_state = simple_device_set_state;
 132         device_init_settings(dev, tb);
 133
 134         return dev;
 135 }
 136
 137 static void simple_device_free(struct device *dev)
 138 {
 139         if (dev->parent.dev)
 140                 device_remove_user(&dev->parent);
 141         free(dev);
 142 }
 143
 144 const struct device_type simple_device_type = {
 145         .name = "Network device",
 146         .config_params = &device_attr_list,
 147
 148         .create = simple_device_create,
 149         .check_state = system_if_check,
 150         .free = simple_device_free,
 151 };
 152
 153 static void
 154 device_merge_settings(struct device *dev, struct device_settings *n)
 155 {
 156         struct device_settings *os = &dev->orig_settings;
 157         struct device_settings *s = &dev->settings;
 158
 159         memset(n, 0, sizeof(*n));
 160         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 161         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 162         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 163                 s->txqueuelen : os->txqueuelen;
 164         memcpy(n->macaddr,
 165                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 166                 sizeof(n->macaddr));
 167         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 168         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 169         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 170         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 171         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 172         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 173         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 174                 s->neigh4reachabletime : os->neigh4reachabletime;
 175         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 176                 s->neigh6reachabletime : os->neigh6reachabletime;
 177         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 178                 s->dadtransmits : os->dadtransmits;
 179         n->multicast_to_unicast = s->multicast_to_unicast;
 180         n->multicast_router = s->multicast_router;
 181         n->flags = s->flags | os->flags;
 182 }
 183
 184 void
 185 device_init_settings(struct device *dev, struct blob_attr **tb)
 186 {
 187         struct device_settings *s = &dev->settings;
 188         struct blob_attr *cur;
 189         struct ether_addr *ea;
 190         bool disabled = false;
 191
 192         s->flags = 0;
 193         if ((cur = tb[DEV_ATTR_ENABLED]))
 194                 disabled = !blobmsg_get_bool(cur);
 195
 196         if ((cur = tb[DEV_ATTR_MTU])) {
 197                 s->mtu = blobmsg_get_u32(cur);
 198                 s->flags |= DEV_OPT_MTU;
 199         }
 200
 201         if ((cur = tb[DEV_ATTR_MTU6])) {
 202                 s->mtu6 = blobmsg_get_u32(cur);
 203                 s->flags |= DEV_OPT_MTU6;
 204         }
 205
 206         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 207                 s->txqueuelen = blobmsg_get_u32(cur);
 208                 s->flags |= DEV_OPT_TXQUEUELEN;
 209         }
 210
 211         if ((cur = tb[DEV_ATTR_MACADDR])) {
 212                 ea = ether_aton(blobmsg_data(cur));
 213                 if (ea) {
 214                         memcpy(s->macaddr, ea, 6);
 215                         s->flags |= DEV_OPT_MACADDR;
 216                 }
 217         }
 218
 219         if ((cur = tb[DEV_ATTR_IPV6])) {
 220                 s->ipv6 = blobmsg_get_bool(cur);
 221                 s->flags |= DEV_OPT_IPV6;
 222         }
 223
 224         if ((cur = tb[DEV_ATTR_PROMISC])) {
 225                 s->promisc = blobmsg_get_bool(cur);
 226                 s->flags |= DEV_OPT_PROMISC;
 227         }
 228
 229         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 230                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 231                         s->flags |= DEV_OPT_RPFILTER;
 232                 else
 233                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 234         }
 235
 236         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 237                 s->acceptlocal = blobmsg_get_bool(cur);
 238                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 239         }
 240
 241         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 242                 s->igmpversion = blobmsg_get_u32(cur);
 243                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 244                         s->flags |= DEV_OPT_IGMPVERSION;
 245                 else
 246                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 247         }
 248
 249         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 250                 s->mldversion = blobmsg_get_u32(cur);
 251                 if (s->mldversion >= 1 && s->mldversion <= 2)
 252                         s->flags |= DEV_OPT_MLDVERSION;
 253                 else
 254                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 255         }
 256
 257         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 258                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 259                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 260         }
 261
 262         if ((cur = tb[DEV_ATTR_RPS])) {
 263                 s->rps = blobmsg_get_bool(cur);
 264                 s->flags |= DEV_OPT_RPS;
 265         }
 266         else
 267                 s->rps = default_ps;
 268
 269         if ((cur = tb[DEV_ATTR_XPS])) {
 270                 s->xps = blobmsg_get_bool(cur);
 271                 s->flags |= DEV_OPT_XPS;
 272         }
 273         else
 274                 s->xps = default_ps;
 275
 276         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 277                 s->dadtransmits = blobmsg_get_u32(cur);
 278                 s->flags |= DEV_OPT_DADTRANSMITS;
 279         }
 280
 281         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 282                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 283                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 284         }
 285
 286         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 287                 s->multicast_router = blobmsg_get_u32(cur);
 288                 if (s->multicast_router <= 2)
 289                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 290                 else
 291                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 292         }
 293
 294         device_set_disabled(dev, disabled);
 295 }
 296
 297 static void __init dev_init(void)
 298 {
 299         avl_init(&devices, avl_strcmp, true, NULL);
 300 }
 301
 302 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 303 {
 304         struct device_user *dep = container_of(list, struct device_user, list);
 305         int *ev = ctx;
 306
 307         /* device might have been removed by an earlier callback */
 308         if (!dep->dev)
 309                 return 0;
 310
 311         if (dep->cb)
 312                 dep->cb(dep, *ev);
 313         return 0;
 314 }
 315
 316 void device_broadcast_event(struct device *dev, enum device_event ev)
 317 {
 318         int dev_ev = ev;
 319
 320         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 321         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 322 }
 323
 324 int device_claim(struct device_user *dep)
 325 {
 326         struct device *dev = dep->dev;
 327         int ret;
 328
 329         if (dep->claimed)
 330                 return 0;
 331
 332         dep->claimed = true;
 333         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 334         if (++dev->active != 1)
 335                 return 0;
 336
 337         device_broadcast_event(dev, DEV_EVENT_SETUP);
 338         ret = dev->set_state(dev, true);
 339         if (ret == 0)
 340                 device_broadcast_event(dev, DEV_EVENT_UP);
 341         else {
 342                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 343                 dev->active = 0;
 344                 dep->claimed = false;
 345         }
 346
 347         return ret;
 348 }
 349
 350 void device_release(struct device_user *dep)
 351 {
 352         struct device *dev = dep->dev;
 353
 354         if (!dep->claimed)
 355                 return;
 356
 357         dep->claimed = false;
 358         dev->active--;
 359         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 360         assert(dev->active >= 0);
 361
 362         if (dev->active)
 363                 return;
 364
 365         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 366         if (!dev->external)
 367                 dev->set_state(dev, false);
 368         device_broadcast_event(dev, DEV_EVENT_DOWN);
 369 }
 370
 371 int device_check_state(struct device *dev)
 372 {
 373         if (!dev->type->check_state)
 374                 return simple_device_type.check_state(dev);
 375
 376         return dev->type->check_state(dev);
 377 }
 378
 379 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 380 {
 381         assert(dev);
 382         assert(type);
 383
 384         if (name)
 385                 strncpy(dev->ifname, name, IFNAMSIZ);
 386
 387         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 388         INIT_SAFE_LIST(&dev->users);
 389         INIT_SAFE_LIST(&dev->aliases);
 390         dev->type = type;
 391
 392         if (!dev->set_state)
 393                 dev->set_state = set_device_state;
 394 }
 395
 396 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 397 {
 398         int ret;
 399
 400         device_init_virtual(dev, type, ifname);
 401
 402         dev->avl.key = dev->ifname;
 403
 404         ret = avl_insert(&devices, &dev->avl);
 405         if (ret < 0)
 406                 return ret;
 407
 408         system_if_clear_state(dev);
 409         device_check_state(dev);
 410         dev->settings.rps = default_ps;
 411         dev->settings.xps = default_ps;
 412
 413         return 0;
 414 }
 415
 416 static struct device *
 417 device_create_default(const char *name, bool external)
 418 {
 419         struct device *dev;
 420
 421         if (!external && system_if_force_external(name))
 422                 return NULL;
 423
 424         D(DEVICE, "Create simple device '%s'\n", name);
 425         dev = calloc(1, sizeof(*dev));
 426         dev->external = external;
 427         dev->set_state = simple_device_set_state;
 428         device_init(dev, &simple_device_type, name);
 429         dev->default_config = true;
 430         if (external)
 431                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 432         return dev;
 433 }
 434
 435 struct device *
 436 device_get(const char *name, int create)
 437 {
 438         struct device *dev;
 439
 440         if (strchr(name, '.'))
 441                 return get_vlan_device_chain(name, create);
 442
 443         if (name[0] == '@')
 444                 return device_alias_get(name + 1);
 445
 446         dev = avl_find_element(&devices, name, dev, avl);
 447         if (dev) {
 448                 if (create > 1 && !dev->external) {
 449                         dev->external = true;
 450                         device_set_present(dev, true);
 451                 }
 452                 return dev;
 453         }
 454
 455         if (!create)
 456                 return NULL;
 457
 458         return device_create_default(name, create > 1);
 459 }
 460
 461 static void
 462 device_delete(struct device *dev)
 463 {
 464         if (!dev->avl.key)
 465                 return;
 466
 467         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 468         avl_delete(&devices, &dev->avl);
 469         dev->avl.key = NULL;
 470 }
 471
 472 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 473 {
 474         struct device_user *dep = container_of(list, struct device_user, list);
 475         if (dep->cb)
 476                 dep->cb(dep, DEV_EVENT_REMOVE);
 477
 478         device_release(dep);
 479         return 0;
 480 }
 481
 482 void device_cleanup(struct device *dev)
 483 {
 484         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 485         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 486         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 487         device_delete(dev);
 488 }
 489
 490 static void __device_set_present(struct device *dev, bool state)
 491 {
 492         if (dev->present == state)
 493                 return;
 494
 495         dev->present = state;
 496         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 497 }
 498
 499 void
 500 device_refresh_present(struct device *dev)
 501 {
 502         bool state = dev->sys_present;
 503
 504         if (dev->disabled || dev->deferred)
 505                 state = false;
 506
 507         __device_set_present(dev, state);
 508 }
 509
 510 void device_set_present(struct device *dev, bool state)
 511 {
 512         if (dev->sys_present == state)
 513                 return;
 514
 515         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 516         dev->sys_present = state;
 517         device_refresh_present(dev);
 518 }
 519
 520 void device_set_link(struct device *dev, bool state)
 521 {
 522         if (dev->link_active == state)
 523                 return;
 524
 525         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 526
 527         dev->link_active = state;
 528         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 529 }
 530
 531 void device_set_ifindex(struct device *dev, int ifindex)
 532 {
 533         if (dev->ifindex == ifindex)
 534                 return;
 535
 536         dev->ifindex = ifindex;
 537         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 538 }
 539
 540 static int device_refcount(struct device *dev)
 541 {
 542         struct list_head *list;
 543         int count = 0;
 544
 545         list_for_each(list, &dev->users.list)
 546                 count++;
 547
 548         list_for_each(list, &dev->aliases.list)
 549                 count++;
 550
 551         return count;
 552 }
 553
 554 static void
 555 __device_add_user(struct device_user *dep, struct device *dev)
 556 {
 557         struct safe_list *head;
 558
 559         dep->dev = dev;
 560
 561         if (dep->alias)
 562                 head = &dev->aliases;
 563         else
 564                 head = &dev->users;
 565
 566         safe_list_add(&dep->list, head);
 567         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 568
 569         if (dep->cb && dev->present) {
 570                 dep->cb(dep, DEV_EVENT_ADD);
 571                 if (dev->active)
 572                         dep->cb(dep, DEV_EVENT_UP);
 573
 574                 if (dev->link_active)
 575                         dep->cb(dep, DEV_EVENT_LINK_UP);
 576         }
 577 }
 578
 579 void device_add_user(struct device_user *dep, struct device *dev)
 580 {
 581         if (dep->dev == dev)
 582                 return;
 583
 584         if (dep->dev)
 585                 device_remove_user(dep);
 586
 587         if (!dev)
 588                 return;
 589
 590         __device_add_user(dep, dev);
 591 }
 592
 593 void
 594 device_free(struct device *dev)
 595 {
 596         __devlock++;
 597         free(dev->config);
 598         device_cleanup(dev);
 599         dev->type->free(dev);
 600         __devlock--;
 601 }
 602
 603 static void
 604 __device_free_unused(struct device *dev)
 605 {
 606         if (!safe_list_empty(&dev->users) ||
 607                 !safe_list_empty(&dev->aliases) ||
 608             dev->current_config || __devlock)
 609                 return;
 610
 611         device_free(dev);
 612 }
 613
 614 void device_remove_user(struct device_user *dep)
 615 {
 616         struct device *dev = dep->dev;
 617
 618         if (!dep->dev)
 619                 return;
 620
 621         dep->hotplug = false;
 622         if (dep->claimed)
 623                 device_release(dep);
 624
 625         safe_list_del(&dep->list);
 626         dep->dev = NULL;
 627         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 628         __device_free_unused(dev);
 629 }
 630
 631 void
 632 device_free_unused(struct device *dev)
 633 {
 634         struct device *tmp;
 635
 636         if (dev)
 637                 return __device_free_unused(dev);
 638
 639         avl_for_each_element_safe(&devices, dev, avl, tmp)
 640                 __device_free_unused(dev);
 641 }
 642
 643 void
 644 device_init_pending(void)
 645 {
 646         struct device *dev, *tmp;
 647
 648         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 649                 if (!dev->config_pending)
 650                         continue;
 651
 652                 dev->type->config_init(dev);
 653                 dev->config_pending = false;
 654         }
 655 }
 656
 657 static enum dev_change_type
 658 device_set_config(struct device *dev, const struct device_type *type,
 659                   struct blob_attr *attr)
 660 {
 661         struct blob_attr *tb[__DEV_ATTR_MAX];
 662         const struct uci_blob_param_list *cfg = type->config_params;
 663
 664         if (type != dev->type)
 665                 return DEV_CONFIG_RECREATE;
 666
 667         if (dev->type->reload)
 668                 return dev->type->reload(dev, attr);
 669
 670         if (uci_blob_check_equal(dev->config, attr, cfg))
 671                 return DEV_CONFIG_NO_CHANGE;
 672
 673         if (cfg == &device_attr_list) {
 674                 memset(tb, 0, sizeof(tb));
 675
 676                 if (attr)
 677                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 678                                 blob_data(attr), blob_len(attr));
 679
 680                 device_init_settings(dev, tb);
 681                 return DEV_CONFIG_RESTART;
 682         } else
 683                 return DEV_CONFIG_RECREATE;
 684 }
 685
 686 enum dev_change_type
 687 device_apply_config(struct device *dev, const struct device_type *type,
 688                     struct blob_attr *config)
 689 {
 690         enum dev_change_type change;
 691
 692         change = device_set_config(dev, type, config);
 693         if (dev->external) {
 694                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 695                 change = DEV_CONFIG_APPLIED;
 696         }
 697
 698         switch (change) {
 699                 case DEV_CONFIG_RESTART:
 700                 case DEV_CONFIG_APPLIED:
 701                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 702                         config = blob_memdup(config);
 703                         free(dev->config);
 704                         dev->config = config;
 705                         if (change == DEV_CONFIG_RESTART && dev->present) {
 706                                 device_set_present(dev, false);
 707                                 if (dev->active && !dev->external) {
 708                                         dev->set_state(dev, false);
 709                                         dev->set_state(dev, true);
 710                                 }
 711                                 device_set_present(dev, true);
 712                         }
 713                         break;
 714                 case DEV_CONFIG_NO_CHANGE:
 715                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 716                         break;
 717                 case DEV_CONFIG_RECREATE:
 718                         break;
 719         }
 720
 721         return change;
 722 }
 723
 724 static void
 725 device_replace(struct device *dev, struct device *odev)
 726 {
 727         struct device_user *dep, *tmp;
 728
 729         __devlock++;
 730         if (odev->present)
 731                 device_set_present(odev, false);
 732
 733         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 734                 device_release(dep);
 735                 safe_list_del(&dep->list);
 736                 __device_add_user(dep, dev);
 737         }
 738         __devlock--;
 739
 740         device_free(odev);
 741 }
 742
 743 void
 744 device_reset_config(void)
 745 {
 746         struct device *dev;
 747
 748         avl_for_each_element(&devices, dev, avl)
 749                 dev->current_config = false;
 750 }
 751
 752 void
 753 device_reset_old(void)
 754 {
 755         struct device *dev, *tmp, *ndev;
 756
 757         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 758                 if (dev->current_config || dev->default_config)
 759                         continue;
 760
 761                 if (dev->type != &simple_device_type)
 762                         continue;
 763
 764                 ndev = device_create_default(dev->ifname, dev->external);
 765                 if (!ndev)
 766                         continue;
 767
 768                 device_replace(ndev, dev);
 769         }
 770 }
 771
 772 void
 773 device_set_default_ps(bool state)
 774 {
 775         struct device *dev;
 776
 777         if (state == default_ps)
 778                 return;
 779
 780         default_ps = state;
 781
 782         avl_for_each_element(&devices, dev, avl) {
 783                 struct device_settings *s = &dev->settings;
 784                 unsigned int apply_mask = 0;
 785
 786                 if (!(s->flags & DEV_OPT_RPS)) {
 787                         s->rps = default_ps;
 788                         apply_mask |= DEV_OPT_RPS;
 789                 }
 790
 791                 if (!(s->flags & DEV_OPT_XPS)) {
 792                         s->xps = default_ps;
 793                         apply_mask |= DEV_OPT_XPS;
 794                 }
 795
 796                 if (!apply_mask)
 797                         continue;
 798
 799                 if (!(dev->external || (dev->present && dev->active)) ||
 800                                 dev->config_pending)
 801                         continue;
 802
 803                 system_if_apply_settings(dev, s, apply_mask);
 804         }
 805 }
 806
 807 struct device *
 808 device_create(const char *name, const struct device_type *type,
 809               struct blob_attr *config)
 810 {
 811         struct device *odev = NULL, *dev;
 812         enum dev_change_type change;
 813
 814         odev = device_get(name, false);
 815         if (odev) {
 816                 odev->current_config = true;
 817                 change = device_apply_config(odev, type, config);
 818                 switch (change) {
 819                 case DEV_CONFIG_RECREATE:
 820                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 821                         device_delete(odev);
 822                         break;
 823                 default:
 824                         return odev;
 825                 }
 826         } else
 827                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 828
 829         config = blob_memdup(config);
 830         if (!config)
 831                 return NULL;
 832
 833         dev = type->create(name, config);
 834         if (!dev)
 835                 return NULL;
 836
 837         dev->current_config = true;
 838         dev->config = config;
 839         if (odev)
 840                 device_replace(dev, odev);
 841
 842         if (!config_init && dev->config_pending) {
 843                 type->config_init(dev);
 844                 dev->config_pending = false;
 845         }
 846
 847         return dev;
 848 }
 849
 850 void
 851 device_dump_status(struct blob_buf *b, struct device *dev)
 852 {
 853         struct device_settings st;
 854         void *c, *s;
 855
 856         if (!dev) {
 857                 avl_for_each_element(&devices, dev, avl) {
 858                         if (!dev->present)
 859                                 continue;
 860                         c = blobmsg_open_table(b, dev->ifname);
 861                         device_dump_status(b, dev);
 862                         blobmsg_close_table(b, c);
 863                 }
 864
 865                 return;
 866         }
 867
 868         blobmsg_add_u8(b, "external", dev->external);
 869         blobmsg_add_u8(b, "present", dev->present);
 870         blobmsg_add_string(b, "type", dev->type->name);
 871
 872         if (!dev->present)
 873                 return;
 874
 875         blobmsg_add_u8(b, "up", !!dev->active);
 876         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 877
 878         if (dev->type->dump_info)
 879                 dev->type->dump_info(dev, b);
 880         else
 881                 system_if_dump_info(dev, b);
 882
 883         if (dev->active) {
 884                 device_merge_settings(dev, &st);
 885                 if (st.flags & DEV_OPT_MTU)
 886                         blobmsg_add_u32(b, "mtu", st.mtu);
 887                 if (st.flags & DEV_OPT_MTU6)
 888                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 889                 if (st.flags & DEV_OPT_MACADDR)
 890                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 891                 if (st.flags & DEV_OPT_TXQUEUELEN)
 892                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 893                 if (st.flags & DEV_OPT_IPV6)
 894                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 895                 if (st.flags & DEV_OPT_PROMISC)
 896                         blobmsg_add_u8(b, "promisc", st.promisc);
 897                 if (st.flags & DEV_OPT_RPFILTER)
 898                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 899                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 900                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 901                 if (st.flags & DEV_OPT_IGMPVERSION)
 902                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 903                 if (st.flags & DEV_OPT_MLDVERSION)
 904                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 905                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 906                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 907                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 908                 }
 909                 if (st.flags & DEV_OPT_DADTRANSMITS)
 910                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 911                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
 912                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
 913                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
 914                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
 915         }
 916
 917         s = blobmsg_open_table(b, "statistics");
 918         if (dev->type->dump_stats)
 919                 dev->type->dump_stats(dev, b);
 920         else
 921                 system_if_dump_stats(dev, b);
 922         blobmsg_close_table(b, s);
 923 }