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_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  49         [DEV_ATTR_RPS] = { .name = "rps", .type = BLOBMSG_TYPE_BOOL },
  50         [DEV_ATTR_XPS] = { .name = "xps", .type = BLOBMSG_TYPE_BOOL },
  51         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  52         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  53         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  54         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  55         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  56         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  57 };
  58
  59 const struct uci_blob_param_list device_attr_list = {
  60         .n_params = __DEV_ATTR_MAX,
  61         .params = dev_attrs,
  62 };
  63
  64 static int __devlock = 0;
  65
  66 void device_lock(void)
  67 {
  68         __devlock++;
  69 }
  70
  71 void device_unlock(void)
  72 {
  73         __devlock--;
  74         if (!__devlock)
  75                 device_free_unused(NULL);
  76 }
  77
  78 static int set_device_state(struct device *dev, bool state)
  79 {
  80         if (state) {
  81                 /* Get ifindex for all devices being enabled so a valid  */
  82                 /* ifindex is in place avoiding possible race conditions */
  83                 device_set_ifindex(dev, system_if_resolve(dev));
  84                 if (!dev->ifindex)
  85                         return -1;
  86
  87                 system_if_up(dev);
  88         }
  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->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 178                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 179         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 180                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 181         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 182                 s->dadtransmits : os->dadtransmits;
 183         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 184                 s->multicast : os->multicast;
 185         n->multicast_to_unicast = s->multicast_to_unicast;
 186         n->multicast_router = s->multicast_router;
 187         n->learning = s->learning;
 188         n->unicast_flood = s->unicast_flood;
 189         n->flags = s->flags | os->flags | os->valid_flags;
 190 }
 191
 192 void
 193 device_init_settings(struct device *dev, struct blob_attr **tb)
 194 {
 195         struct device_settings *s = &dev->settings;
 196         struct blob_attr *cur;
 197         struct ether_addr *ea;
 198         bool disabled = false;
 199
 200         s->flags = 0;
 201         if ((cur = tb[DEV_ATTR_ENABLED]))
 202                 disabled = !blobmsg_get_bool(cur);
 203
 204         if ((cur = tb[DEV_ATTR_MTU])) {
 205                 s->mtu = blobmsg_get_u32(cur);
 206                 s->flags |= DEV_OPT_MTU;
 207         }
 208
 209         if ((cur = tb[DEV_ATTR_MTU6])) {
 210                 s->mtu6 = blobmsg_get_u32(cur);
 211                 s->flags |= DEV_OPT_MTU6;
 212         }
 213
 214         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 215                 s->txqueuelen = blobmsg_get_u32(cur);
 216                 s->flags |= DEV_OPT_TXQUEUELEN;
 217         }
 218
 219         if ((cur = tb[DEV_ATTR_MACADDR])) {
 220                 ea = ether_aton(blobmsg_data(cur));
 221                 if (ea) {
 222                         memcpy(s->macaddr, ea, 6);
 223                         s->flags |= DEV_OPT_MACADDR;
 224                 }
 225         }
 226
 227         if ((cur = tb[DEV_ATTR_IPV6])) {
 228                 s->ipv6 = blobmsg_get_bool(cur);
 229                 s->flags |= DEV_OPT_IPV6;
 230         }
 231
 232         if ((cur = tb[DEV_ATTR_PROMISC])) {
 233                 s->promisc = blobmsg_get_bool(cur);
 234                 s->flags |= DEV_OPT_PROMISC;
 235         }
 236
 237         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 238                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 239                         s->flags |= DEV_OPT_RPFILTER;
 240                 else
 241                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 242         }
 243
 244         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 245                 s->acceptlocal = blobmsg_get_bool(cur);
 246                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 247         }
 248
 249         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 250                 s->igmpversion = blobmsg_get_u32(cur);
 251                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 252                         s->flags |= DEV_OPT_IGMPVERSION;
 253                 else
 254                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 255         }
 256
 257         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 258                 s->mldversion = blobmsg_get_u32(cur);
 259                 if (s->mldversion >= 1 && s->mldversion <= 2)
 260                         s->flags |= DEV_OPT_MLDVERSION;
 261                 else
 262                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 263         }
 264
 265         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 266                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 267                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 268         }
 269
 270         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 271                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 272                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 273         }
 274
 275         if ((cur = tb[DEV_ATTR_RPS])) {
 276                 s->rps = blobmsg_get_bool(cur);
 277                 s->flags |= DEV_OPT_RPS;
 278         }
 279         else
 280                 s->rps = default_ps;
 281
 282         if ((cur = tb[DEV_ATTR_XPS])) {
 283                 s->xps = blobmsg_get_bool(cur);
 284                 s->flags |= DEV_OPT_XPS;
 285         }
 286         else
 287                 s->xps = default_ps;
 288
 289         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 290                 s->dadtransmits = blobmsg_get_u32(cur);
 291                 s->flags |= DEV_OPT_DADTRANSMITS;
 292         }
 293
 294         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 295                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 296                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 297         }
 298
 299         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 300                 s->multicast_router = blobmsg_get_u32(cur);
 301                 if (s->multicast_router <= 2)
 302                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 303                 else
 304                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 305         }
 306
 307         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 308                 s->multicast = blobmsg_get_bool(cur);
 309                 s->flags |= DEV_OPT_MULTICAST;
 310         }
 311
 312         if ((cur = tb[DEV_ATTR_LEARNING])) {
 313                 s->learning = blobmsg_get_bool(cur);
 314                 s->flags |= DEV_OPT_LEARNING;
 315         }
 316
 317         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 318                 s->unicast_flood = blobmsg_get_bool(cur);
 319                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 320         }
 321
 322         device_set_disabled(dev, disabled);
 323 }
 324
 325 static void __init dev_init(void)
 326 {
 327         avl_init(&devices, avl_strcmp, true, NULL);
 328 }
 329
 330 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 331 {
 332         struct device_user *dep = container_of(list, struct device_user, list);
 333         int *ev = ctx;
 334
 335         /* device might have been removed by an earlier callback */
 336         if (!dep->dev)
 337                 return 0;
 338
 339         if (dep->cb)
 340                 dep->cb(dep, *ev);
 341         return 0;
 342 }
 343
 344 void device_broadcast_event(struct device *dev, enum device_event ev)
 345 {
 346         int dev_ev = ev;
 347
 348         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 349         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 350 }
 351
 352 int device_claim(struct device_user *dep)
 353 {
 354         struct device *dev = dep->dev;
 355         int ret = 0;
 356
 357         if (dep->claimed)
 358                 return 0;
 359
 360         if (!dev)
 361                 return -1;
 362
 363         dep->claimed = true;
 364         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 365         if (++dev->active != 1)
 366                 return 0;
 367
 368         device_broadcast_event(dev, DEV_EVENT_SETUP);
 369         if (dev->external) {
 370                 /* Get ifindex for external claimed devices so a valid   */
 371                 /* ifindex is in place avoiding possible race conditions */
 372                 device_set_ifindex(dev, system_if_resolve(dev));
 373                 if (!dev->ifindex)
 374                         ret = -1;
 375
 376                 system_if_get_settings(dev, &dev->orig_settings);
 377         } else
 378                 ret = dev->set_state(dev, true);
 379
 380         if (ret == 0)
 381                 device_broadcast_event(dev, DEV_EVENT_UP);
 382         else {
 383                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 384                 dev->active = 0;
 385                 dep->claimed = false;
 386         }
 387
 388         return ret;
 389 }
 390
 391 void device_release(struct device_user *dep)
 392 {
 393         struct device *dev = dep->dev;
 394
 395         if (!dep->claimed)
 396                 return;
 397
 398         dep->claimed = false;
 399         dev->active--;
 400         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 401         assert(dev->active >= 0);
 402
 403         if (dev->active)
 404                 return;
 405
 406         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 407         if (!dev->external)
 408                 dev->set_state(dev, false);
 409         device_broadcast_event(dev, DEV_EVENT_DOWN);
 410 }
 411
 412 int device_check_state(struct device *dev)
 413 {
 414         if (!dev->type->check_state)
 415                 return simple_device_type.check_state(dev);
 416
 417         return dev->type->check_state(dev);
 418 }
 419
 420 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 421 {
 422         assert(dev);
 423         assert(type);
 424
 425         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 426         INIT_SAFE_LIST(&dev->users);
 427         INIT_SAFE_LIST(&dev->aliases);
 428         dev->type = type;
 429
 430         if (name)
 431                 device_set_ifname(dev, name);
 432
 433         if (!dev->set_state)
 434                 dev->set_state = set_device_state;
 435 }
 436
 437 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 438 {
 439         int ret;
 440
 441         device_init_virtual(dev, type, ifname);
 442
 443         dev->avl.key = dev->ifname;
 444
 445         ret = avl_insert(&devices, &dev->avl);
 446         if (ret < 0)
 447                 return ret;
 448
 449         system_if_clear_state(dev);
 450         device_check_state(dev);
 451         dev->settings.rps = default_ps;
 452         dev->settings.xps = default_ps;
 453
 454         return 0;
 455 }
 456
 457 static struct device *
 458 device_create_default(const char *name, bool external)
 459 {
 460         struct device *dev;
 461
 462         if (!external && system_if_force_external(name))
 463                 return NULL;
 464
 465         D(DEVICE, "Create simple device '%s'\n", name);
 466         dev = calloc(1, sizeof(*dev));
 467         if (!dev)
 468                 return NULL;
 469
 470         dev->external = external;
 471         dev->set_state = simple_device_set_state;
 472         device_init(dev, &simple_device_type, name);
 473         dev->default_config = true;
 474         if (external)
 475                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 476         return dev;
 477 }
 478
 479 struct device *
 480 device_find(const char *name)
 481 {
 482         struct device *dev;
 483
 484         return avl_find_element(&devices, name, dev, avl);
 485 }
 486
 487 struct device *
 488 device_get(const char *name, int create)
 489 {
 490         struct device *dev;
 491
 492         if (strchr(name, '.'))
 493                 return get_vlan_device_chain(name, create);
 494
 495         if (name[0] == '@')
 496                 return device_alias_get(name + 1);
 497
 498         dev = avl_find_element(&devices, name, dev, avl);
 499         if (dev) {
 500                 if (create > 1 && !dev->external) {
 501                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 502                         dev->external = true;
 503                         device_set_present(dev, true);
 504                 }
 505                 return dev;
 506         }
 507
 508         if (!create)
 509                 return NULL;
 510
 511         return device_create_default(name, create > 1);
 512 }
 513
 514 static void
 515 device_delete(struct device *dev)
 516 {
 517         if (!dev->avl.key)
 518                 return;
 519
 520         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 521         avl_delete(&devices, &dev->avl);
 522         dev->avl.key = NULL;
 523 }
 524
 525 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 526 {
 527         struct device_user *dep = container_of(list, struct device_user, list);
 528         if (dep->cb)
 529                 dep->cb(dep, DEV_EVENT_REMOVE);
 530
 531         device_release(dep);
 532         return 0;
 533 }
 534
 535 void device_cleanup(struct device *dev)
 536 {
 537         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 538         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 539         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 540         device_delete(dev);
 541 }
 542
 543 static void __device_set_present(struct device *dev, bool state)
 544 {
 545         if (dev->present == state)
 546                 return;
 547
 548         dev->present = state;
 549         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 550 }
 551
 552 void
 553 device_refresh_present(struct device *dev)
 554 {
 555         bool state = dev->sys_present;
 556
 557         if (dev->disabled || dev->deferred)
 558                 state = false;
 559
 560         __device_set_present(dev, state);
 561 }
 562
 563 void device_set_present(struct device *dev, bool state)
 564 {
 565         if (dev->sys_present == state)
 566                 return;
 567
 568         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 569         dev->sys_present = state;
 570         device_refresh_present(dev);
 571 }
 572
 573 void device_set_link(struct device *dev, bool state)
 574 {
 575         if (dev->link_active == state)
 576                 return;
 577
 578         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 579
 580         dev->link_active = state;
 581         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 582 }
 583
 584 void device_set_ifindex(struct device *dev, int ifindex)
 585 {
 586         if (dev->ifindex == ifindex)
 587                 return;
 588
 589         dev->ifindex = ifindex;
 590         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 591 }
 592
 593 int device_set_ifname(struct device *dev, const char *name)
 594 {
 595         int ret = 0;
 596
 597         if (!strcmp(dev->ifname, name))
 598                 return 0;
 599
 600         if (dev->avl.key)
 601                 avl_delete(&devices, &dev->avl);
 602
 603         strncpy(dev->ifname, name, IFNAMSIZ);
 604
 605         if (dev->avl.key)
 606                 ret = avl_insert(&devices, &dev->avl);
 607
 608         if (ret == 0)
 609                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 610
 611         return ret;
 612 }
 613
 614 static int device_refcount(struct device *dev)
 615 {
 616         struct list_head *list;
 617         int count = 0;
 618
 619         list_for_each(list, &dev->users.list)
 620                 count++;
 621
 622         list_for_each(list, &dev->aliases.list)
 623                 count++;
 624
 625         return count;
 626 }
 627
 628 static void
 629 __device_add_user(struct device_user *dep, struct device *dev)
 630 {
 631         struct safe_list *head;
 632
 633         dep->dev = dev;
 634
 635         if (dep->alias)
 636                 head = &dev->aliases;
 637         else
 638                 head = &dev->users;
 639
 640         safe_list_add(&dep->list, head);
 641         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 642
 643         if (dep->cb && dev->present) {
 644                 dep->cb(dep, DEV_EVENT_ADD);
 645                 if (dev->active)
 646                         dep->cb(dep, DEV_EVENT_UP);
 647
 648                 if (dev->link_active)
 649                         dep->cb(dep, DEV_EVENT_LINK_UP);
 650         }
 651 }
 652
 653 void device_add_user(struct device_user *dep, struct device *dev)
 654 {
 655         if (dep->dev == dev)
 656                 return;
 657
 658         if (dep->dev)
 659                 device_remove_user(dep);
 660
 661         if (!dev)
 662                 return;
 663
 664         __device_add_user(dep, dev);
 665 }
 666
 667 void
 668 device_free(struct device *dev)
 669 {
 670         __devlock++;
 671         free(dev->config);
 672         device_cleanup(dev);
 673         dev->type->free(dev);
 674         __devlock--;
 675 }
 676
 677 static void
 678 __device_free_unused(struct device *dev)
 679 {
 680         if (!safe_list_empty(&dev->users) ||
 681                 !safe_list_empty(&dev->aliases) ||
 682             dev->current_config || __devlock)
 683                 return;
 684
 685         device_free(dev);
 686 }
 687
 688 void device_remove_user(struct device_user *dep)
 689 {
 690         struct device *dev = dep->dev;
 691
 692         if (!dep->dev)
 693                 return;
 694
 695         dep->hotplug = false;
 696         if (dep->claimed)
 697                 device_release(dep);
 698
 699         safe_list_del(&dep->list);
 700         dep->dev = NULL;
 701         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 702         __device_free_unused(dev);
 703 }
 704
 705 void
 706 device_free_unused(struct device *dev)
 707 {
 708         struct device *tmp;
 709
 710         if (dev)
 711                 return __device_free_unused(dev);
 712
 713         avl_for_each_element_safe(&devices, dev, avl, tmp)
 714                 __device_free_unused(dev);
 715 }
 716
 717 void
 718 device_init_pending(void)
 719 {
 720         struct device *dev, *tmp;
 721
 722         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 723                 if (!dev->config_pending)
 724                         continue;
 725
 726                 dev->type->config_init(dev);
 727                 dev->config_pending = false;
 728         }
 729 }
 730
 731 static enum dev_change_type
 732 device_set_config(struct device *dev, const struct device_type *type,
 733                   struct blob_attr *attr)
 734 {
 735         struct blob_attr *tb[__DEV_ATTR_MAX];
 736         const struct uci_blob_param_list *cfg = type->config_params;
 737
 738         if (type != dev->type)
 739                 return DEV_CONFIG_RECREATE;
 740
 741         if (dev->type->reload)
 742                 return dev->type->reload(dev, attr);
 743
 744         if (uci_blob_check_equal(dev->config, attr, cfg))
 745                 return DEV_CONFIG_NO_CHANGE;
 746
 747         if (cfg == &device_attr_list) {
 748                 memset(tb, 0, sizeof(tb));
 749
 750                 if (attr)
 751                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 752                                 blob_data(attr), blob_len(attr));
 753
 754                 device_init_settings(dev, tb);
 755                 return DEV_CONFIG_RESTART;
 756         } else
 757                 return DEV_CONFIG_RECREATE;
 758 }
 759
 760 enum dev_change_type
 761 device_apply_config(struct device *dev, const struct device_type *type,
 762                     struct blob_attr *config)
 763 {
 764         enum dev_change_type change;
 765
 766         change = device_set_config(dev, type, config);
 767         if (dev->external) {
 768                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 769                 change = DEV_CONFIG_APPLIED;
 770         }
 771
 772         switch (change) {
 773                 case DEV_CONFIG_RESTART:
 774                 case DEV_CONFIG_APPLIED:
 775                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 776                         config = blob_memdup(config);
 777                         free(dev->config);
 778                         dev->config = config;
 779                         if (change == DEV_CONFIG_RESTART && dev->present) {
 780                                 int ret = 0;
 781
 782                                 device_set_present(dev, false);
 783                                 if (dev->active && !dev->external) {
 784                                         ret = dev->set_state(dev, false);
 785                                         if (!ret)
 786                                                 ret = dev->set_state(dev, true);
 787                                 }
 788                                 if (!ret)
 789                                         device_set_present(dev, true);
 790                         }
 791                         break;
 792                 case DEV_CONFIG_NO_CHANGE:
 793                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 794                         break;
 795                 case DEV_CONFIG_RECREATE:
 796                         break;
 797         }
 798
 799         return change;
 800 }
 801
 802 static void
 803 device_replace(struct device *dev, struct device *odev)
 804 {
 805         struct device_user *dep, *tmp;
 806
 807         __devlock++;
 808         if (odev->present)
 809                 device_set_present(odev, false);
 810
 811         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 812                 device_release(dep);
 813                 safe_list_del(&dep->list);
 814                 __device_add_user(dep, dev);
 815         }
 816         __devlock--;
 817
 818         device_free(odev);
 819 }
 820
 821 void
 822 device_reset_config(void)
 823 {
 824         struct device *dev;
 825
 826         avl_for_each_element(&devices, dev, avl)
 827                 dev->current_config = false;
 828 }
 829
 830 void
 831 device_reset_old(void)
 832 {
 833         struct device *dev, *tmp, *ndev;
 834
 835         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 836                 if (dev->current_config || dev->default_config)
 837                         continue;
 838
 839                 if (dev->type != &simple_device_type)
 840                         continue;
 841
 842                 ndev = device_create_default(dev->ifname, dev->external);
 843                 if (!ndev)
 844                         continue;
 845
 846                 device_replace(ndev, dev);
 847         }
 848 }
 849
 850 void
 851 device_set_default_ps(bool state)
 852 {
 853         struct device *dev;
 854
 855         if (state == default_ps)
 856                 return;
 857
 858         default_ps = state;
 859
 860         avl_for_each_element(&devices, dev, avl) {
 861                 struct device_settings *s = &dev->settings;
 862                 unsigned int apply_mask = 0;
 863
 864                 if (!(s->flags & DEV_OPT_RPS)) {
 865                         s->rps = default_ps;
 866                         apply_mask |= DEV_OPT_RPS;
 867                 }
 868
 869                 if (!(s->flags & DEV_OPT_XPS)) {
 870                         s->xps = default_ps;
 871                         apply_mask |= DEV_OPT_XPS;
 872                 }
 873
 874                 if (!apply_mask)
 875                         continue;
 876
 877                 if (!(dev->external || (dev->present && dev->active)) ||
 878                                 dev->config_pending)
 879                         continue;
 880
 881                 system_if_apply_settings(dev, s, apply_mask);
 882         }
 883 }
 884
 885 struct device *
 886 device_create(const char *name, const struct device_type *type,
 887               struct blob_attr *config)
 888 {
 889         struct device *odev = NULL, *dev;
 890         enum dev_change_type change;
 891
 892         odev = device_get(name, false);
 893         if (odev) {
 894                 odev->current_config = true;
 895                 change = device_apply_config(odev, type, config);
 896                 switch (change) {
 897                 case DEV_CONFIG_RECREATE:
 898                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 899                         device_delete(odev);
 900                         break;
 901                 default:
 902                         return odev;
 903                 }
 904         } else
 905                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 906
 907         config = blob_memdup(config);
 908         if (!config)
 909                 return NULL;
 910
 911         dev = type->create(name, config);
 912         if (!dev)
 913                 return NULL;
 914
 915         dev->current_config = true;
 916         dev->config = config;
 917         if (odev)
 918                 device_replace(dev, odev);
 919
 920         if (!config_init && dev->config_pending) {
 921                 type->config_init(dev);
 922                 dev->config_pending = false;
 923         }
 924
 925         return dev;
 926 }
 927
 928 void
 929 device_dump_status(struct blob_buf *b, struct device *dev)
 930 {
 931         struct device_settings st;
 932         void *c, *s;
 933
 934         if (!dev) {
 935                 avl_for_each_element(&devices, dev, avl) {
 936                         if (!dev->present)
 937                                 continue;
 938                         c = blobmsg_open_table(b, dev->ifname);
 939                         device_dump_status(b, dev);
 940                         blobmsg_close_table(b, c);
 941                 }
 942
 943                 return;
 944         }
 945
 946         blobmsg_add_u8(b, "external", dev->external);
 947         blobmsg_add_u8(b, "present", dev->present);
 948         blobmsg_add_string(b, "type", dev->type->name);
 949
 950         if (!dev->present)
 951                 return;
 952
 953         blobmsg_add_u8(b, "up", !!dev->active);
 954         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 955
 956         if (dev->type->dump_info)
 957                 dev->type->dump_info(dev, b);
 958         else
 959                 system_if_dump_info(dev, b);
 960
 961         if (dev->active) {
 962                 device_merge_settings(dev, &st);
 963                 if (st.flags & DEV_OPT_MTU)
 964                         blobmsg_add_u32(b, "mtu", st.mtu);
 965                 if (st.flags & DEV_OPT_MTU6)
 966                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 967                 if (st.flags & DEV_OPT_MACADDR)
 968                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 969                 if (st.flags & DEV_OPT_TXQUEUELEN)
 970                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 971                 if (st.flags & DEV_OPT_IPV6)
 972                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 973                 if (st.flags & DEV_OPT_PROMISC)
 974                         blobmsg_add_u8(b, "promisc", st.promisc);
 975                 if (st.flags & DEV_OPT_RPFILTER)
 976                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 977                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 978                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 979                 if (st.flags & DEV_OPT_IGMPVERSION)
 980                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 981                 if (st.flags & DEV_OPT_MLDVERSION)
 982                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 983                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 984                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 985                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 986                 }
 987                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
 988                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
 989                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
 990                 }
 991                 if (st.flags & DEV_OPT_DADTRANSMITS)
 992                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 993                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
 994                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
 995                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
 996                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
 997                 if (st.flags & DEV_OPT_MULTICAST)
 998                         blobmsg_add_u8(b, "multicast", st.multicast);
 999                 if (st.flags & DEV_OPT_LEARNING)
1000                         blobmsg_add_u8(b, "learning", st.learning);
1001                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1002                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1003         }
1004
1005         s = blobmsg_open_table(b, "statistics");
1006         if (dev->type->dump_stats)
1007                 dev->type->dump_stats(dev, b);
1008         else
1009                 system_if_dump_stats(dev, b);
1010         blobmsg_close_table(b, s);
1011 }