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         return dev;
 414 }
 415
 416 struct device *
 417 device_get(const char *name, int create)
 418 {
 419         struct device *dev;
 420
 421         if (strchr(name, '.'))
 422                 return get_vlan_device_chain(name, create);
 423
 424         if (name[0] == '@')
 425                 return device_alias_get(name + 1);
 426
 427         dev = avl_find_element(&devices, name, dev, avl);
 428         if (dev) {
 429                 if (create > 1 && !dev->external) {
 430                         dev->external = true;
 431                         device_set_present(dev, true);
 432                 }
 433                 return dev;
 434         }
 435
 436         if (!create)
 437                 return NULL;
 438
 439         return device_create_default(name, create > 1);
 440 }
 441
 442 static void
 443 device_delete(struct device *dev)
 444 {
 445         if (!dev->avl.key)
 446                 return;
 447
 448         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 449         avl_delete(&devices, &dev->avl);
 450         dev->avl.key = NULL;
 451 }
 452
 453 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 454 {
 455         struct device_user *dep = container_of(list, struct device_user, list);
 456         if (dep->cb)
 457                 dep->cb(dep, DEV_EVENT_REMOVE);
 458
 459         device_release(dep);
 460         return 0;
 461 }
 462
 463 void device_cleanup(struct device *dev)
 464 {
 465         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 466         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 467         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 468         device_delete(dev);
 469 }
 470
 471 static void __device_set_present(struct device *dev, bool state)
 472 {
 473         if (dev->present == state)
 474                 return;
 475
 476         dev->present = state;
 477         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 478 }
 479
 480 void
 481 device_refresh_present(struct device *dev)
 482 {
 483         bool state = dev->sys_present;
 484
 485         if (dev->disabled || dev->deferred)
 486                 state = false;
 487
 488         __device_set_present(dev, state);
 489 }
 490
 491 void device_set_present(struct device *dev, bool state)
 492 {
 493         if (dev->sys_present == state)
 494                 return;
 495
 496         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 497         dev->sys_present = state;
 498         device_refresh_present(dev);
 499 }
 500
 501 void device_set_link(struct device *dev, bool state)
 502 {
 503         if (dev->link_active == state)
 504                 return;
 505
 506         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 507
 508         dev->link_active = state;
 509         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 510 }
 511
 512 void device_set_ifindex(struct device *dev, int ifindex)
 513 {
 514         if (dev->ifindex == ifindex)
 515                 return;
 516
 517         dev->ifindex = ifindex;
 518         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 519 }
 520
 521 static int device_refcount(struct device *dev)
 522 {
 523         struct list_head *list;
 524         int count = 0;
 525
 526         list_for_each(list, &dev->users.list)
 527                 count++;
 528
 529         list_for_each(list, &dev->aliases.list)
 530                 count++;
 531
 532         return count;
 533 }
 534
 535 void device_add_user(struct device_user *dep, struct device *dev)
 536 {
 537         struct safe_list *head;
 538
 539         if (dep->dev == dev)
 540                 return;
 541
 542         if (dep->dev)
 543                 device_remove_user(dep);
 544
 545         if (!dev)
 546                 return;
 547
 548         dep->dev = dev;
 549
 550         if (dep->alias)
 551                 head = &dev->aliases;
 552         else
 553                 head = &dev->users;
 554
 555         safe_list_add(&dep->list, head);
 556         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 557
 558         if (dep->cb && dev->present) {
 559                 dep->cb(dep, DEV_EVENT_ADD);
 560                 if (dev->active)
 561                         dep->cb(dep, DEV_EVENT_UP);
 562
 563                 if (dev->link_active)
 564                         dep->cb(dep, DEV_EVENT_LINK_UP);
 565         }
 566 }
 567
 568 void
 569 device_free(struct device *dev)
 570 {
 571         __devlock++;
 572         free(dev->config);
 573         device_cleanup(dev);
 574         dev->type->free(dev);
 575         __devlock--;
 576 }
 577
 578 static void
 579 __device_free_unused(struct device *dev)
 580 {
 581         if (!safe_list_empty(&dev->users) ||
 582                 !safe_list_empty(&dev->aliases) ||
 583             dev->current_config || __devlock)
 584                 return;
 585
 586         device_free(dev);
 587 }
 588
 589 void device_remove_user(struct device_user *dep)
 590 {
 591         struct device *dev = dep->dev;
 592
 593         if (!dep->dev)
 594                 return;
 595
 596         dep->hotplug = false;
 597         if (dep->claimed)
 598                 device_release(dep);
 599
 600         safe_list_del(&dep->list);
 601         dep->dev = NULL;
 602         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 603         __device_free_unused(dev);
 604 }
 605
 606 void
 607 device_free_unused(struct device *dev)
 608 {
 609         struct device *tmp;
 610
 611         if (dev)
 612                 return __device_free_unused(dev);
 613
 614         avl_for_each_element_safe(&devices, dev, avl, tmp)
 615                 __device_free_unused(dev);
 616 }
 617
 618 void
 619 device_init_pending(void)
 620 {
 621         struct device *dev, *tmp;
 622
 623         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 624                 if (!dev->config_pending)
 625                         continue;
 626
 627                 dev->type->config_init(dev);
 628                 dev->config_pending = false;
 629         }
 630 }
 631
 632 static enum dev_change_type
 633 device_set_config(struct device *dev, const struct device_type *type,
 634                   struct blob_attr *attr)
 635 {
 636         struct blob_attr *tb[__DEV_ATTR_MAX];
 637         const struct uci_blob_param_list *cfg = type->config_params;
 638
 639         if (type != dev->type)
 640                 return DEV_CONFIG_RECREATE;
 641
 642         if (dev->type->reload)
 643                 return dev->type->reload(dev, attr);
 644
 645         if (uci_blob_check_equal(dev->config, attr, cfg))
 646                 return DEV_CONFIG_NO_CHANGE;
 647
 648         if (cfg == &device_attr_list) {
 649                 memset(tb, 0, sizeof(tb));
 650
 651                 if (attr)
 652                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 653                                 blob_data(attr), blob_len(attr));
 654
 655                 device_init_settings(dev, tb);
 656                 return DEV_CONFIG_RESTART;
 657         } else
 658                 return DEV_CONFIG_RECREATE;
 659 }
 660
 661 enum dev_change_type
 662 device_apply_config(struct device *dev, const struct device_type *type,
 663                     struct blob_attr *config)
 664 {
 665         enum dev_change_type change;
 666
 667         change = device_set_config(dev, type, config);
 668         if (dev->external) {
 669                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 670                 change = DEV_CONFIG_APPLIED;
 671         }
 672
 673         switch (change) {
 674                 case DEV_CONFIG_RESTART:
 675                 case DEV_CONFIG_APPLIED:
 676                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 677                         config = blob_memdup(config);
 678                         free(dev->config);
 679                         dev->config = config;
 680                         if (change == DEV_CONFIG_RESTART && dev->present) {
 681                                 device_set_present(dev, false);
 682                                 if (dev->active && !dev->external) {
 683                                         dev->set_state(dev, false);
 684                                         dev->set_state(dev, true);
 685                                 }
 686                                 device_set_present(dev, true);
 687                         }
 688                         break;
 689                 case DEV_CONFIG_NO_CHANGE:
 690                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 691                         break;
 692                 case DEV_CONFIG_RECREATE:
 693                         break;
 694         }
 695
 696         return change;
 697 }
 698
 699 static void
 700 device_replace(struct device *dev, struct device *odev)
 701 {
 702         struct device_user *dep, *tmp;
 703         bool present = odev->present;
 704
 705         if (present)
 706                 device_set_present(odev, false);
 707
 708         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 709                 device_release(dep);
 710                 safe_list_del(&dep->list);
 711                 safe_list_add(&dep->list, &dev->users);
 712                 dep->dev = dev;
 713         }
 714         device_free(odev);
 715
 716         if (present)
 717                 device_set_present(dev, true);
 718 }
 719
 720 void
 721 device_reset_config(void)
 722 {
 723         struct device *dev;
 724
 725         avl_for_each_element(&devices, dev, avl)
 726                 dev->current_config = false;
 727 }
 728
 729 void
 730 device_reset_old(void)
 731 {
 732         struct device *dev, *tmp, *ndev;
 733
 734         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 735                 if (dev->current_config || dev->default_config)
 736                         continue;
 737
 738                 if (dev->type != &simple_device_type)
 739                         continue;
 740
 741                 ndev = device_create_default(dev->ifname, dev->external);
 742                 device_replace(ndev, dev);
 743         }
 744 }
 745
 746 void
 747 device_set_default_ps(bool state)
 748 {
 749         struct device *dev;
 750
 751         if (state == default_ps)
 752                 return;
 753
 754         default_ps = state;
 755
 756         avl_for_each_element(&devices, dev, avl) {
 757                 struct device_settings *s = &dev->settings;
 758                 unsigned int apply_mask = 0;
 759
 760                 if (!(s->flags & DEV_OPT_RPS)) {
 761                         s->rps = default_ps;
 762                         apply_mask |= DEV_OPT_RPS;
 763                 }
 764
 765                 if (!(s->flags & DEV_OPT_XPS)) {
 766                         s->xps = default_ps;
 767                         apply_mask |= DEV_OPT_XPS;
 768                 }
 769
 770                 if (!apply_mask)
 771                         continue;
 772
 773                 if (!(dev->external || (dev->present && dev->active)) ||
 774                                 dev->config_pending)
 775                         continue;
 776
 777                 system_if_apply_settings(dev, s, apply_mask);
 778         }
 779 }
 780
 781 struct device *
 782 device_create(const char *name, const struct device_type *type,
 783               struct blob_attr *config)
 784 {
 785         struct device *odev = NULL, *dev;
 786         enum dev_change_type change;
 787
 788         odev = device_get(name, false);
 789         if (odev) {
 790                 odev->current_config = true;
 791                 change = device_apply_config(odev, type, config);
 792                 switch (change) {
 793                 case DEV_CONFIG_RECREATE:
 794                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 795                         device_delete(odev);
 796                         break;
 797                 default:
 798                         return odev;
 799                 }
 800         } else
 801                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 802
 803         config = blob_memdup(config);
 804         if (!config)
 805                 return NULL;
 806
 807         dev = type->create(name, config);
 808         if (!dev)
 809                 return NULL;
 810
 811         dev->current_config = true;
 812         dev->config = config;
 813         if (odev)
 814                 device_replace(dev, odev);
 815
 816         if (!config_init && dev->config_pending) {
 817                 type->config_init(dev);
 818                 dev->config_pending = false;
 819         }
 820
 821         return dev;
 822 }
 823
 824 void
 825 device_dump_status(struct blob_buf *b, struct device *dev)
 826 {
 827         struct device_settings st;
 828         void *c, *s;
 829
 830         if (!dev) {
 831                 avl_for_each_element(&devices, dev, avl) {
 832                         if (!dev->present)
 833                                 continue;
 834                         c = blobmsg_open_table(b, dev->ifname);
 835                         device_dump_status(b, dev);
 836                         blobmsg_close_table(b, c);
 837                 }
 838
 839                 return;
 840         }
 841
 842         blobmsg_add_u8(b, "external", dev->external);
 843         blobmsg_add_u8(b, "present", dev->present);
 844         blobmsg_add_string(b, "type", dev->type->name);
 845
 846         if (!dev->present)
 847                 return;
 848
 849         blobmsg_add_u8(b, "up", !!dev->active);
 850         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 851
 852         if (dev->type->dump_info)
 853                 dev->type->dump_info(dev, b);
 854         else
 855                 system_if_dump_info(dev, b);
 856
 857         if (dev->active) {
 858                 device_merge_settings(dev, &st);
 859                 if (st.flags & DEV_OPT_MTU)
 860                         blobmsg_add_u32(b, "mtu", st.mtu);
 861                 if (st.flags & DEV_OPT_MTU6)
 862                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 863                 if (st.flags & DEV_OPT_MACADDR)
 864                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 865                 if (st.flags & DEV_OPT_TXQUEUELEN)
 866                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 867                 if (st.flags & DEV_OPT_IPV6)
 868                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 869                 if (st.flags & DEV_OPT_PROMISC)
 870                         blobmsg_add_u8(b, "promisc", st.promisc);
 871                 if (st.flags & DEV_OPT_RPFILTER)
 872                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 873                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 874                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 875                 if (st.flags & DEV_OPT_IGMPVERSION)
 876                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 877                 if (st.flags & DEV_OPT_MLDVERSION)
 878                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 879                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 880                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 881                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 882                 }
 883                 if (st.flags & DEV_OPT_DADTRANSMITS)
 884                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 885         }
 886
 887         s = blobmsg_open_table(b, "statistics");
 888         if (dev->type->dump_stats)
 889                 dev->type->dump_stats(dev, b);
 890         else
 891                 system_if_dump_stats(dev, b);
 892         blobmsg_close_table(b, s);
 893 }