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