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 device_type *devtype,
 122                      struct blob_attr *attr)
 123 {
 124         struct blob_attr *tb[__DEV_ATTR_MAX];
 125         struct device *dev = NULL;
 126
 127         /* device type is unused for simple devices */
 128         devtype = NULL;
 129
 130         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 131         dev = device_get(name, true);
 132         if (!dev)
 133                 return NULL;
 134
 135         dev->set_state = simple_device_set_state;
 136         device_init_settings(dev, tb);
 137
 138         return dev;
 139 }
 140
 141 static void simple_device_free(struct device *dev)
 142 {
 143         if (dev->parent.dev)
 144                 device_remove_user(&dev->parent);
 145         free(dev);
 146 }
 147
 148 struct device_type simple_device_type = {
 149         .name = "Network device",
 150         .config_params = &device_attr_list,
 151
 152         .create = simple_device_create,
 153         .check_state = system_if_check,
 154         .free = simple_device_free,
 155 };
 156
 157 static void
 158 device_merge_settings(struct device *dev, struct device_settings *n)
 159 {
 160         struct device_settings *os = &dev->orig_settings;
 161         struct device_settings *s = &dev->settings;
 162
 163         memset(n, 0, sizeof(*n));
 164         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 165         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 166         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 167                 s->txqueuelen : os->txqueuelen;
 168         memcpy(n->macaddr,
 169                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 170                 sizeof(n->macaddr));
 171         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 172         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 173         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 174         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 175         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 176         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 177         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 178                 s->neigh4reachabletime : os->neigh4reachabletime;
 179         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 180                 s->neigh6reachabletime : os->neigh6reachabletime;
 181         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 182                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 183         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 184                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 185         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 186                 s->dadtransmits : os->dadtransmits;
 187         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 188                 s->multicast : os->multicast;
 189         n->multicast_to_unicast = s->multicast_to_unicast;
 190         n->multicast_router = s->multicast_router;
 191         n->learning = s->learning;
 192         n->unicast_flood = s->unicast_flood;
 193         n->flags = s->flags | os->flags | os->valid_flags;
 194 }
 195
 196 void
 197 device_init_settings(struct device *dev, struct blob_attr **tb)
 198 {
 199         struct device_settings *s = &dev->settings;
 200         struct blob_attr *cur;
 201         struct ether_addr *ea;
 202         bool disabled = false;
 203
 204         s->flags = 0;
 205         if ((cur = tb[DEV_ATTR_ENABLED]))
 206                 disabled = !blobmsg_get_bool(cur);
 207
 208         if ((cur = tb[DEV_ATTR_MTU])) {
 209                 s->mtu = blobmsg_get_u32(cur);
 210                 s->flags |= DEV_OPT_MTU;
 211         }
 212
 213         if ((cur = tb[DEV_ATTR_MTU6])) {
 214                 s->mtu6 = blobmsg_get_u32(cur);
 215                 s->flags |= DEV_OPT_MTU6;
 216         }
 217
 218         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 219                 s->txqueuelen = blobmsg_get_u32(cur);
 220                 s->flags |= DEV_OPT_TXQUEUELEN;
 221         }
 222
 223         if ((cur = tb[DEV_ATTR_MACADDR])) {
 224                 ea = ether_aton(blobmsg_data(cur));
 225                 if (ea) {
 226                         memcpy(s->macaddr, ea, 6);
 227                         s->flags |= DEV_OPT_MACADDR;
 228                 }
 229         }
 230
 231         if ((cur = tb[DEV_ATTR_IPV6])) {
 232                 s->ipv6 = blobmsg_get_bool(cur);
 233                 s->flags |= DEV_OPT_IPV6;
 234         }
 235
 236         if ((cur = tb[DEV_ATTR_PROMISC])) {
 237                 s->promisc = blobmsg_get_bool(cur);
 238                 s->flags |= DEV_OPT_PROMISC;
 239         }
 240
 241         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 242                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 243                         s->flags |= DEV_OPT_RPFILTER;
 244                 else
 245                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 246         }
 247
 248         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 249                 s->acceptlocal = blobmsg_get_bool(cur);
 250                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 251         }
 252
 253         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 254                 s->igmpversion = blobmsg_get_u32(cur);
 255                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 256                         s->flags |= DEV_OPT_IGMPVERSION;
 257                 else
 258                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 259         }
 260
 261         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 262                 s->mldversion = blobmsg_get_u32(cur);
 263                 if (s->mldversion >= 1 && s->mldversion <= 2)
 264                         s->flags |= DEV_OPT_MLDVERSION;
 265                 else
 266                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 267         }
 268
 269         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 270                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 271                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 272         }
 273
 274         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 275                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 276                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 277         }
 278
 279         if ((cur = tb[DEV_ATTR_RPS])) {
 280                 s->rps = blobmsg_get_bool(cur);
 281                 s->flags |= DEV_OPT_RPS;
 282         }
 283         else
 284                 s->rps = default_ps;
 285
 286         if ((cur = tb[DEV_ATTR_XPS])) {
 287                 s->xps = blobmsg_get_bool(cur);
 288                 s->flags |= DEV_OPT_XPS;
 289         }
 290         else
 291                 s->xps = default_ps;
 292
 293         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 294                 s->dadtransmits = blobmsg_get_u32(cur);
 295                 s->flags |= DEV_OPT_DADTRANSMITS;
 296         }
 297
 298         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 299                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 300                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 301         }
 302
 303         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 304                 s->multicast_router = blobmsg_get_u32(cur);
 305                 if (s->multicast_router <= 2)
 306                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 307                 else
 308                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 309         }
 310
 311         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 312                 s->multicast = blobmsg_get_bool(cur);
 313                 s->flags |= DEV_OPT_MULTICAST;
 314         }
 315
 316         if ((cur = tb[DEV_ATTR_LEARNING])) {
 317                 s->learning = blobmsg_get_bool(cur);
 318                 s->flags |= DEV_OPT_LEARNING;
 319         }
 320
 321         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 322                 s->unicast_flood = blobmsg_get_bool(cur);
 323                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 324         }
 325
 326         device_set_disabled(dev, disabled);
 327 }
 328
 329 static void __init dev_init(void)
 330 {
 331         avl_init(&devices, avl_strcmp, true, NULL);
 332 }
 333
 334 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 335 {
 336         struct device_user *dep = container_of(list, struct device_user, list);
 337         int *ev = ctx;
 338
 339         /* device might have been removed by an earlier callback */
 340         if (!dep->dev)
 341                 return 0;
 342
 343         if (dep->cb)
 344                 dep->cb(dep, *ev);
 345         return 0;
 346 }
 347
 348 void device_broadcast_event(struct device *dev, enum device_event ev)
 349 {
 350         int dev_ev = ev;
 351
 352         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 353         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 354 }
 355
 356 int device_claim(struct device_user *dep)
 357 {
 358         struct device *dev = dep->dev;
 359         int ret = 0;
 360
 361         if (dep->claimed)
 362                 return 0;
 363
 364         if (!dev)
 365                 return -1;
 366
 367         dep->claimed = true;
 368         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 369         if (++dev->active != 1)
 370                 return 0;
 371
 372         device_broadcast_event(dev, DEV_EVENT_SETUP);
 373         if (dev->external) {
 374                 /* Get ifindex for external claimed devices so a valid   */
 375                 /* ifindex is in place avoiding possible race conditions */
 376                 device_set_ifindex(dev, system_if_resolve(dev));
 377                 if (!dev->ifindex)
 378                         ret = -1;
 379
 380                 system_if_get_settings(dev, &dev->orig_settings);
 381         } else
 382                 ret = dev->set_state(dev, true);
 383
 384         if (ret == 0)
 385                 device_broadcast_event(dev, DEV_EVENT_UP);
 386         else {
 387                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 388                 dev->active = 0;
 389                 dep->claimed = false;
 390         }
 391
 392         return ret;
 393 }
 394
 395 void device_release(struct device_user *dep)
 396 {
 397         struct device *dev = dep->dev;
 398
 399         if (!dep->claimed)
 400                 return;
 401
 402         dep->claimed = false;
 403         dev->active--;
 404         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 405         assert(dev->active >= 0);
 406
 407         if (dev->active)
 408                 return;
 409
 410         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 411         if (!dev->external)
 412                 dev->set_state(dev, false);
 413         device_broadcast_event(dev, DEV_EVENT_DOWN);
 414 }
 415
 416 int device_check_state(struct device *dev)
 417 {
 418         if (!dev->type->check_state)
 419                 return simple_device_type.check_state(dev);
 420
 421         return dev->type->check_state(dev);
 422 }
 423
 424 void device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 425 {
 426         assert(dev);
 427         assert(type);
 428
 429         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 430         INIT_SAFE_LIST(&dev->users);
 431         INIT_SAFE_LIST(&dev->aliases);
 432         dev->type = type;
 433
 434         if (name)
 435                 device_set_ifname(dev, name);
 436
 437         if (!dev->set_state)
 438                 dev->set_state = set_device_state;
 439 }
 440
 441 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 442 {
 443         int ret;
 444
 445         device_init_virtual(dev, type, ifname);
 446
 447         dev->avl.key = dev->ifname;
 448
 449         ret = avl_insert(&devices, &dev->avl);
 450         if (ret < 0)
 451                 return ret;
 452
 453         system_if_clear_state(dev);
 454         device_check_state(dev);
 455         dev->settings.rps = default_ps;
 456         dev->settings.xps = default_ps;
 457
 458         return 0;
 459 }
 460
 461 static struct device *
 462 device_create_default(const char *name, bool external)
 463 {
 464         struct device *dev;
 465
 466         if (!external && system_if_force_external(name))
 467                 return NULL;
 468
 469         D(DEVICE, "Create simple device '%s'\n", name);
 470         dev = calloc(1, sizeof(*dev));
 471         if (!dev)
 472                 return NULL;
 473
 474         dev->external = external;
 475         dev->set_state = simple_device_set_state;
 476         device_init(dev, &simple_device_type, name);
 477         dev->default_config = true;
 478         if (external)
 479                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 480         return dev;
 481 }
 482
 483 struct device *
 484 device_find(const char *name)
 485 {
 486         struct device *dev;
 487
 488         return avl_find_element(&devices, name, dev, avl);
 489 }
 490
 491 struct device *
 492 device_get(const char *name, int create)
 493 {
 494         struct device *dev;
 495
 496         if (strchr(name, '.'))
 497                 return get_vlan_device_chain(name, create);
 498
 499         if (name[0] == '@')
 500                 return device_alias_get(name + 1);
 501
 502         dev = avl_find_element(&devices, name, dev, avl);
 503         if (dev) {
 504                 if (create > 1 && !dev->external) {
 505                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 506                         dev->external = true;
 507                         device_set_present(dev, true);
 508                 }
 509                 return dev;
 510         }
 511
 512         if (!create)
 513                 return NULL;
 514
 515         return device_create_default(name, create > 1);
 516 }
 517
 518 static void
 519 device_delete(struct device *dev)
 520 {
 521         if (!dev->avl.key)
 522                 return;
 523
 524         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 525         avl_delete(&devices, &dev->avl);
 526         dev->avl.key = NULL;
 527 }
 528
 529 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 530 {
 531         struct device_user *dep = container_of(list, struct device_user, list);
 532         if (dep->cb)
 533                 dep->cb(dep, DEV_EVENT_REMOVE);
 534
 535         device_release(dep);
 536         return 0;
 537 }
 538
 539 void device_cleanup(struct device *dev)
 540 {
 541         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 542         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 543         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 544         device_delete(dev);
 545 }
 546
 547 static void __device_set_present(struct device *dev, bool state)
 548 {
 549         if (dev->present == state)
 550                 return;
 551
 552         dev->present = state;
 553         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 554 }
 555
 556 void
 557 device_refresh_present(struct device *dev)
 558 {
 559         bool state = dev->sys_present;
 560
 561         if (dev->disabled || dev->deferred)
 562                 state = false;
 563
 564         __device_set_present(dev, state);
 565 }
 566
 567 void device_set_present(struct device *dev, bool state)
 568 {
 569         if (dev->sys_present == state)
 570                 return;
 571
 572         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 573         dev->sys_present = state;
 574         device_refresh_present(dev);
 575 }
 576
 577 void device_set_link(struct device *dev, bool state)
 578 {
 579         if (dev->link_active == state)
 580                 return;
 581
 582         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 583
 584         dev->link_active = state;
 585         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 586 }
 587
 588 void device_set_ifindex(struct device *dev, int ifindex)
 589 {
 590         if (dev->ifindex == ifindex)
 591                 return;
 592
 593         dev->ifindex = ifindex;
 594         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 595 }
 596
 597 int device_set_ifname(struct device *dev, const char *name)
 598 {
 599         int ret = 0;
 600
 601         if (!strcmp(dev->ifname, name))
 602                 return 0;
 603
 604         if (dev->avl.key)
 605                 avl_delete(&devices, &dev->avl);
 606
 607         strncpy(dev->ifname, name, IFNAMSIZ);
 608
 609         if (dev->avl.key)
 610                 ret = avl_insert(&devices, &dev->avl);
 611
 612         if (ret == 0)
 613                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 614
 615         return ret;
 616 }
 617
 618 static int device_refcount(struct device *dev)
 619 {
 620         struct list_head *list;
 621         int count = 0;
 622
 623         list_for_each(list, &dev->users.list)
 624                 count++;
 625
 626         list_for_each(list, &dev->aliases.list)
 627                 count++;
 628
 629         return count;
 630 }
 631
 632 static void
 633 __device_add_user(struct device_user *dep, struct device *dev)
 634 {
 635         struct safe_list *head;
 636
 637         dep->dev = dev;
 638
 639         if (dep->alias)
 640                 head = &dev->aliases;
 641         else
 642                 head = &dev->users;
 643
 644         safe_list_add(&dep->list, head);
 645         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 646
 647         if (dep->cb && dev->present) {
 648                 dep->cb(dep, DEV_EVENT_ADD);
 649                 if (dev->active)
 650                         dep->cb(dep, DEV_EVENT_UP);
 651
 652                 if (dev->link_active)
 653                         dep->cb(dep, DEV_EVENT_LINK_UP);
 654         }
 655 }
 656
 657 void device_add_user(struct device_user *dep, struct device *dev)
 658 {
 659         if (dep->dev == dev)
 660                 return;
 661
 662         if (dep->dev)
 663                 device_remove_user(dep);
 664
 665         if (!dev)
 666                 return;
 667
 668         __device_add_user(dep, dev);
 669 }
 670
 671 void
 672 device_free(struct device *dev)
 673 {
 674         __devlock++;
 675         free(dev->config);
 676         device_cleanup(dev);
 677         dev->type->free(dev);
 678         __devlock--;
 679 }
 680
 681 static void
 682 __device_free_unused(struct device *dev)
 683 {
 684         if (!safe_list_empty(&dev->users) ||
 685                 !safe_list_empty(&dev->aliases) ||
 686             dev->current_config || __devlock)
 687                 return;
 688
 689         device_free(dev);
 690 }
 691
 692 void device_remove_user(struct device_user *dep)
 693 {
 694         struct device *dev = dep->dev;
 695
 696         if (!dep->dev)
 697                 return;
 698
 699         dep->hotplug = false;
 700         if (dep->claimed)
 701                 device_release(dep);
 702
 703         safe_list_del(&dep->list);
 704         dep->dev = NULL;
 705         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 706         __device_free_unused(dev);
 707 }
 708
 709 void
 710 device_free_unused(struct device *dev)
 711 {
 712         struct device *tmp;
 713
 714         if (dev)
 715                 return __device_free_unused(dev);
 716
 717         avl_for_each_element_safe(&devices, dev, avl, tmp)
 718                 __device_free_unused(dev);
 719 }
 720
 721 void
 722 device_init_pending(void)
 723 {
 724         struct device *dev, *tmp;
 725
 726         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 727                 if (!dev->config_pending)
 728                         continue;
 729
 730                 dev->type->config_init(dev);
 731                 dev->config_pending = false;
 732         }
 733 }
 734
 735 static enum dev_change_type
 736 device_set_config(struct device *dev, struct device_type *type,
 737                   struct blob_attr *attr)
 738 {
 739         struct blob_attr *tb[__DEV_ATTR_MAX];
 740         const struct uci_blob_param_list *cfg = type->config_params;
 741
 742         if (type != dev->type)
 743                 return DEV_CONFIG_RECREATE;
 744
 745         if (dev->type->reload)
 746                 return dev->type->reload(dev, attr);
 747
 748         if (uci_blob_check_equal(dev->config, attr, cfg))
 749                 return DEV_CONFIG_NO_CHANGE;
 750
 751         if (cfg == &device_attr_list) {
 752                 memset(tb, 0, sizeof(tb));
 753
 754                 if (attr)
 755                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 756                                 blob_data(attr), blob_len(attr));
 757
 758                 device_init_settings(dev, tb);
 759                 return DEV_CONFIG_RESTART;
 760         } else
 761                 return DEV_CONFIG_RECREATE;
 762 }
 763
 764 enum dev_change_type
 765 device_apply_config(struct device *dev, struct device_type *type,
 766                     struct blob_attr *config)
 767 {
 768         enum dev_change_type change;
 769
 770         change = device_set_config(dev, type, config);
 771         if (dev->external) {
 772                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 773                 change = DEV_CONFIG_APPLIED;
 774         }
 775
 776         switch (change) {
 777                 case DEV_CONFIG_RESTART:
 778                 case DEV_CONFIG_APPLIED:
 779                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 780                         config = blob_memdup(config);
 781                         free(dev->config);
 782                         dev->config = config;
 783                         if (change == DEV_CONFIG_RESTART && dev->present) {
 784                                 int ret = 0;
 785
 786                                 device_set_present(dev, false);
 787                                 if (dev->active && !dev->external) {
 788                                         ret = dev->set_state(dev, false);
 789                                         if (!ret)
 790                                                 ret = dev->set_state(dev, true);
 791                                 }
 792                                 if (!ret)
 793                                         device_set_present(dev, true);
 794                         }
 795                         break;
 796                 case DEV_CONFIG_NO_CHANGE:
 797                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 798                         break;
 799                 case DEV_CONFIG_RECREATE:
 800                         break;
 801         }
 802
 803         return change;
 804 }
 805
 806 static void
 807 device_replace(struct device *dev, struct device *odev)
 808 {
 809         struct device_user *dep, *tmp;
 810
 811         __devlock++;
 812         if (odev->present)
 813                 device_set_present(odev, false);
 814
 815         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 816                 device_release(dep);
 817                 safe_list_del(&dep->list);
 818                 __device_add_user(dep, dev);
 819         }
 820         __devlock--;
 821
 822         device_free(odev);
 823 }
 824
 825 void
 826 device_reset_config(void)
 827 {
 828         struct device *dev;
 829
 830         avl_for_each_element(&devices, dev, avl)
 831                 dev->current_config = false;
 832 }
 833
 834 void
 835 device_reset_old(void)
 836 {
 837         struct device *dev, *tmp, *ndev;
 838
 839         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 840                 if (dev->current_config || dev->default_config)
 841                         continue;
 842
 843                 if (dev->type != &simple_device_type)
 844                         continue;
 845
 846                 ndev = device_create_default(dev->ifname, dev->external);
 847                 if (!ndev)
 848                         continue;
 849
 850                 device_replace(ndev, dev);
 851         }
 852 }
 853
 854 void
 855 device_set_default_ps(bool state)
 856 {
 857         struct device *dev;
 858
 859         if (state == default_ps)
 860                 return;
 861
 862         default_ps = state;
 863
 864         avl_for_each_element(&devices, dev, avl) {
 865                 struct device_settings *s = &dev->settings;
 866                 unsigned int apply_mask = 0;
 867
 868                 if (!(s->flags & DEV_OPT_RPS)) {
 869                         s->rps = default_ps;
 870                         apply_mask |= DEV_OPT_RPS;
 871                 }
 872
 873                 if (!(s->flags & DEV_OPT_XPS)) {
 874                         s->xps = default_ps;
 875                         apply_mask |= DEV_OPT_XPS;
 876                 }
 877
 878                 if (!apply_mask)
 879                         continue;
 880
 881                 if (!(dev->external || (dev->present && dev->active)) ||
 882                                 dev->config_pending)
 883                         continue;
 884
 885                 system_if_apply_settings(dev, s, apply_mask);
 886         }
 887 }
 888
 889 struct device *
 890 device_create(const char *name, struct device_type *type,
 891               struct blob_attr *config)
 892 {
 893         struct device *odev = NULL, *dev;
 894         enum dev_change_type change;
 895
 896         odev = device_get(name, false);
 897         if (odev) {
 898                 odev->current_config = true;
 899                 change = device_apply_config(odev, type, config);
 900                 switch (change) {
 901                 case DEV_CONFIG_RECREATE:
 902                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 903                         device_delete(odev);
 904                         break;
 905                 default:
 906                         return odev;
 907                 }
 908         } else
 909                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 910
 911         config = blob_memdup(config);
 912         if (!config)
 913                 return NULL;
 914
 915         dev = type->create(name, type, config);
 916         if (!dev)
 917                 return NULL;
 918
 919         dev->current_config = true;
 920         dev->config = config;
 921         if (odev)
 922                 device_replace(dev, odev);
 923
 924         if (!config_init && dev->config_pending) {
 925                 type->config_init(dev);
 926                 dev->config_pending = false;
 927         }
 928
 929         return dev;
 930 }
 931
 932 void
 933 device_dump_status(struct blob_buf *b, struct device *dev)
 934 {
 935         struct device_settings st;
 936         void *c, *s;
 937
 938         if (!dev) {
 939                 avl_for_each_element(&devices, dev, avl) {
 940                         if (!dev->present)
 941                                 continue;
 942                         c = blobmsg_open_table(b, dev->ifname);
 943                         device_dump_status(b, dev);
 944                         blobmsg_close_table(b, c);
 945                 }
 946
 947                 return;
 948         }
 949
 950         blobmsg_add_u8(b, "external", dev->external);
 951         blobmsg_add_u8(b, "present", dev->present);
 952         blobmsg_add_string(b, "type", dev->type->name);
 953
 954         if (!dev->present)
 955                 return;
 956
 957         blobmsg_add_u8(b, "up", !!dev->active);
 958         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 959
 960         if (dev->type->dump_info)
 961                 dev->type->dump_info(dev, b);
 962         else
 963                 system_if_dump_info(dev, b);
 964
 965         if (dev->active) {
 966                 device_merge_settings(dev, &st);
 967                 if (st.flags & DEV_OPT_MTU)
 968                         blobmsg_add_u32(b, "mtu", st.mtu);
 969                 if (st.flags & DEV_OPT_MTU6)
 970                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 971                 if (st.flags & DEV_OPT_MACADDR)
 972                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 973                 if (st.flags & DEV_OPT_TXQUEUELEN)
 974                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 975                 if (st.flags & DEV_OPT_IPV6)
 976                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 977                 if (st.flags & DEV_OPT_PROMISC)
 978                         blobmsg_add_u8(b, "promisc", st.promisc);
 979                 if (st.flags & DEV_OPT_RPFILTER)
 980                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 981                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 982                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 983                 if (st.flags & DEV_OPT_IGMPVERSION)
 984                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 985                 if (st.flags & DEV_OPT_MLDVERSION)
 986                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 987                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 988                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 989                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 990                 }
 991                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
 992                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
 993                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
 994                 }
 995                 if (st.flags & DEV_OPT_DADTRANSMITS)
 996                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 997                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
 998                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
 999                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1000                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1001                 if (st.flags & DEV_OPT_MULTICAST)
1002                         blobmsg_add_u8(b, "multicast", st.multicast);
1003                 if (st.flags & DEV_OPT_LEARNING)
1004                         blobmsg_add_u8(b, "learning", st.learning);
1005                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1006                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1007         }
1008
1009         s = blobmsg_open_table(b, "statistics");
1010         if (dev->type->dump_stats)
1011                 dev->type->dump_stats(dev, b);
1012         else
1013                 system_if_dump_stats(dev, b);
1014         blobmsg_close_table(b, s);
1015 }