device.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <assert.h>
  18
  19 #include <sys/types.h>
  20 #include <sys/socket.h>
  21 #include <net/ethernet.h>
  22
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26
  27 #include "netifd.h"
  28 #include "system.h"
  29 #include "config.h"
  30
  31 static struct avl_tree devices;
  32 static bool default_ps = true;
  33
  34 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  35         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  36         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  38         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  39         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  40         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  41         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  42         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  44         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  45         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  46         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  47         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  48         [DEV_ATTR_RPS] = { .name = "rps", .type = BLOBMSG_TYPE_BOOL },
  49         [DEV_ATTR_XPS] = { .name = "xps", .type = BLOBMSG_TYPE_BOOL },
  50         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  51         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  52         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  53         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  54         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  55         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  56 };
  57
  58 const struct uci_blob_param_list device_attr_list = {
  59         .n_params = __DEV_ATTR_MAX,
  60         .params = dev_attrs,
  61 };
  62
  63 static int __devlock = 0;
  64
  65 void device_lock(void)
  66 {
  67         __devlock++;
  68 }
  69
  70 void device_unlock(void)
  71 {
  72         __devlock--;
  73         if (!__devlock)
  74                 device_free_unused(NULL);
  75 }
  76
  77 static int set_device_state(struct device *dev, bool state)
  78 {
  79         if (state) {
  80                 /* Get ifindex for all devices being enabled so a valid  */
  81                 /* ifindex is in place avoiding possible race conditions */
  82                 device_set_ifindex(dev, system_if_resolve(dev));
  83                 if (!dev->ifindex)
  84                         return -1;
  85
  86                 system_if_up(dev);
  87         }
  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 = s->flags & DEV_OPT_MULTICAST ?
 179                 s->multicast : os->multicast;
 180         n->multicast_to_unicast = s->multicast_to_unicast;
 181         n->multicast_router = s->multicast_router;
 182         n->learning = s->learning;
 183         n->unicast_flood = s->unicast_flood;
 184         n->flags = s->flags | os->flags | os->valid_flags;
 185 }
 186
 187 void
 188 device_init_settings(struct device *dev, struct blob_attr **tb)
 189 {
 190         struct device_settings *s = &dev->settings;
 191         struct blob_attr *cur;
 192         struct ether_addr *ea;
 193         bool disabled = false;
 194
 195         s->flags = 0;
 196         if ((cur = tb[DEV_ATTR_ENABLED]))
 197                 disabled = !blobmsg_get_bool(cur);
 198
 199         if ((cur = tb[DEV_ATTR_MTU])) {
 200                 s->mtu = blobmsg_get_u32(cur);
 201                 s->flags |= DEV_OPT_MTU;
 202         }
 203
 204         if ((cur = tb[DEV_ATTR_MTU6])) {
 205                 s->mtu6 = blobmsg_get_u32(cur);
 206                 s->flags |= DEV_OPT_MTU6;
 207         }
 208
 209         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 210                 s->txqueuelen = blobmsg_get_u32(cur);
 211                 s->flags |= DEV_OPT_TXQUEUELEN;
 212         }
 213
 214         if ((cur = tb[DEV_ATTR_MACADDR])) {
 215                 ea = ether_aton(blobmsg_data(cur));
 216                 if (ea) {
 217                         memcpy(s->macaddr, ea, 6);
 218                         s->flags |= DEV_OPT_MACADDR;
 219                 }
 220         }
 221
 222         if ((cur = tb[DEV_ATTR_IPV6])) {
 223                 s->ipv6 = blobmsg_get_bool(cur);
 224                 s->flags |= DEV_OPT_IPV6;
 225         }
 226
 227         if ((cur = tb[DEV_ATTR_PROMISC])) {
 228                 s->promisc = blobmsg_get_bool(cur);
 229                 s->flags |= DEV_OPT_PROMISC;
 230         }
 231
 232         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 233                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 234                         s->flags |= DEV_OPT_RPFILTER;
 235                 else
 236                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 237         }
 238
 239         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 240                 s->acceptlocal = blobmsg_get_bool(cur);
 241                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 242         }
 243
 244         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 245                 s->igmpversion = blobmsg_get_u32(cur);
 246                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 247                         s->flags |= DEV_OPT_IGMPVERSION;
 248                 else
 249                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 250         }
 251
 252         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 253                 s->mldversion = blobmsg_get_u32(cur);
 254                 if (s->mldversion >= 1 && s->mldversion <= 2)
 255                         s->flags |= DEV_OPT_MLDVERSION;
 256                 else
 257                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 258         }
 259
 260         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 261                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 262                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 263         }
 264
 265         if ((cur = tb[DEV_ATTR_RPS])) {
 266                 s->rps = blobmsg_get_bool(cur);
 267                 s->flags |= DEV_OPT_RPS;
 268         }
 269         else
 270                 s->rps = default_ps;
 271
 272         if ((cur = tb[DEV_ATTR_XPS])) {
 273                 s->xps = blobmsg_get_bool(cur);
 274                 s->flags |= DEV_OPT_XPS;
 275         }
 276         else
 277                 s->xps = default_ps;
 278
 279         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 280                 s->dadtransmits = blobmsg_get_u32(cur);
 281                 s->flags |= DEV_OPT_DADTRANSMITS;
 282         }
 283
 284         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 285                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 286                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 287         }
 288
 289         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 290                 s->multicast_router = blobmsg_get_u32(cur);
 291                 if (s->multicast_router <= 2)
 292                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 293                 else
 294                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 295         }
 296
 297         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 298                 s->multicast = blobmsg_get_bool(cur);
 299                 s->flags |= DEV_OPT_MULTICAST;
 300         }
 301
 302         if ((cur = tb[DEV_ATTR_LEARNING])) {
 303                 s->learning = blobmsg_get_bool(cur);
 304                 s->flags |= DEV_OPT_LEARNING;
 305         }
 306
 307         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 308                 s->unicast_flood = blobmsg_get_bool(cur);
 309                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 310         }
 311
 312         device_set_disabled(dev, disabled);
 313 }
 314
 315 static void __init dev_init(void)
 316 {
 317         avl_init(&devices, avl_strcmp, true, NULL);
 318 }
 319
 320 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 321 {
 322         struct device_user *dep = container_of(list, struct device_user, list);
 323         int *ev = ctx;
 324
 325         /* device might have been removed by an earlier callback */
 326         if (!dep->dev)
 327                 return 0;
 328
 329         if (dep->cb)
 330                 dep->cb(dep, *ev);
 331         return 0;
 332 }
 333
 334 void device_broadcast_event(struct device *dev, enum device_event ev)
 335 {
 336         int dev_ev = ev;
 337
 338         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 339         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 340 }
 341
 342 int device_claim(struct device_user *dep)
 343 {
 344         struct device *dev = dep->dev;
 345         int ret = 0;
 346
 347         if (dep->claimed)
 348                 return 0;
 349
 350         if (!dev)
 351                 return -1;
 352
 353         dep->claimed = true;
 354         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 355         if (++dev->active != 1)
 356                 return 0;
 357
 358         device_broadcast_event(dev, DEV_EVENT_SETUP);
 359         if (dev->external) {
 360                 /* Get ifindex for external claimed devices so a valid   */
 361                 /* ifindex is in place avoiding possible race conditions */
 362                 device_set_ifindex(dev, system_if_resolve(dev));
 363                 if (!dev->ifindex)
 364                         ret = -1;
 365
 366                 system_if_get_settings(dev, &dev->orig_settings);
 367         } else
 368                 ret = dev->set_state(dev, true);
 369
 370         if (ret == 0)
 371                 device_broadcast_event(dev, DEV_EVENT_UP);
 372         else {
 373                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 374                 dev->active = 0;
 375                 dep->claimed = false;
 376         }
 377
 378         return ret;
 379 }
 380
 381 void device_release(struct device_user *dep)
 382 {
 383         struct device *dev = dep->dev;
 384
 385         if (!dep->claimed)
 386                 return;
 387
 388         dep->claimed = false;
 389         dev->active--;
 390         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 391         assert(dev->active >= 0);
 392
 393         if (dev->active)
 394                 return;
 395
 396         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 397         if (!dev->external)
 398                 dev->set_state(dev, false);
 399         device_broadcast_event(dev, DEV_EVENT_DOWN);
 400 }
 401
 402 int device_check_state(struct device *dev)
 403 {
 404         if (!dev->type->check_state)
 405                 return simple_device_type.check_state(dev);
 406
 407         return dev->type->check_state(dev);
 408 }
 409
 410 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 411 {
 412         assert(dev);
 413         assert(type);
 414
 415         if (name)
 416                 strncpy(dev->ifname, name, IFNAMSIZ);
 417
 418         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 419         INIT_SAFE_LIST(&dev->users);
 420         INIT_SAFE_LIST(&dev->aliases);
 421         dev->type = type;
 422
 423         if (!dev->set_state)
 424                 dev->set_state = set_device_state;
 425 }
 426
 427 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 428 {
 429         int ret;
 430
 431         device_init_virtual(dev, type, ifname);
 432
 433         dev->avl.key = dev->ifname;
 434
 435         ret = avl_insert(&devices, &dev->avl);
 436         if (ret < 0)
 437                 return ret;
 438
 439         system_if_clear_state(dev);
 440         device_check_state(dev);
 441         dev->settings.rps = default_ps;
 442         dev->settings.xps = default_ps;
 443
 444         return 0;
 445 }
 446
 447 static struct device *
 448 device_create_default(const char *name, bool external)
 449 {
 450         struct device *dev;
 451
 452         if (!external && system_if_force_external(name))
 453                 return NULL;
 454
 455         D(DEVICE, "Create simple device '%s'\n", name);
 456         dev = calloc(1, sizeof(*dev));
 457         if (!dev)
 458                 return NULL;
 459
 460         dev->external = external;
 461         dev->set_state = simple_device_set_state;
 462         device_init(dev, &simple_device_type, name);
 463         dev->default_config = true;
 464         if (external)
 465                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 466         return dev;
 467 }
 468
 469 struct device *
 470 device_get(const char *name, int create)
 471 {
 472         struct device *dev;
 473
 474         if (strchr(name, '.'))
 475                 return get_vlan_device_chain(name, create);
 476
 477         if (name[0] == '@')
 478                 return device_alias_get(name + 1);
 479
 480         dev = avl_find_element(&devices, name, dev, avl);
 481         if (dev) {
 482                 if (create > 1 && !dev->external) {
 483                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 484                         dev->external = true;
 485                         device_set_present(dev, true);
 486                 }
 487                 return dev;
 488         }
 489
 490         if (!create)
 491                 return NULL;
 492
 493         return device_create_default(name, create > 1);
 494 }
 495
 496 static void
 497 device_delete(struct device *dev)
 498 {
 499         if (!dev->avl.key)
 500                 return;
 501
 502         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 503         avl_delete(&devices, &dev->avl);
 504         dev->avl.key = NULL;
 505 }
 506
 507 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 508 {
 509         struct device_user *dep = container_of(list, struct device_user, list);
 510         if (dep->cb)
 511                 dep->cb(dep, DEV_EVENT_REMOVE);
 512
 513         device_release(dep);
 514         return 0;
 515 }
 516
 517 void device_cleanup(struct device *dev)
 518 {
 519         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 520         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 521         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 522         device_delete(dev);
 523 }
 524
 525 static void __device_set_present(struct device *dev, bool state)
 526 {
 527         if (dev->present == state)
 528                 return;
 529
 530         dev->present = state;
 531         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 532 }
 533
 534 void
 535 device_refresh_present(struct device *dev)
 536 {
 537         bool state = dev->sys_present;
 538
 539         if (dev->disabled || dev->deferred)
 540                 state = false;
 541
 542         __device_set_present(dev, state);
 543 }
 544
 545 void device_set_present(struct device *dev, bool state)
 546 {
 547         if (dev->sys_present == state)
 548                 return;
 549
 550         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 551         dev->sys_present = state;
 552         device_refresh_present(dev);
 553 }
 554
 555 void device_set_link(struct device *dev, bool state)
 556 {
 557         if (dev->link_active == state)
 558                 return;
 559
 560         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 561
 562         dev->link_active = state;
 563         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 564 }
 565
 566 void device_set_ifindex(struct device *dev, int ifindex)
 567 {
 568         if (dev->ifindex == ifindex)
 569                 return;
 570
 571         dev->ifindex = ifindex;
 572         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 573 }
 574
 575 static int device_refcount(struct device *dev)
 576 {
 577         struct list_head *list;
 578         int count = 0;
 579
 580         list_for_each(list, &dev->users.list)
 581                 count++;
 582
 583         list_for_each(list, &dev->aliases.list)
 584                 count++;
 585
 586         return count;
 587 }
 588
 589 static void
 590 __device_add_user(struct device_user *dep, struct device *dev)
 591 {
 592         struct safe_list *head;
 593
 594         dep->dev = dev;
 595
 596         if (dep->alias)
 597                 head = &dev->aliases;
 598         else
 599                 head = &dev->users;
 600
 601         safe_list_add(&dep->list, head);
 602         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 603
 604         if (dep->cb && dev->present) {
 605                 dep->cb(dep, DEV_EVENT_ADD);
 606                 if (dev->active)
 607                         dep->cb(dep, DEV_EVENT_UP);
 608
 609                 if (dev->link_active)
 610                         dep->cb(dep, DEV_EVENT_LINK_UP);
 611         }
 612 }
 613
 614 void device_add_user(struct device_user *dep, struct device *dev)
 615 {
 616         if (dep->dev == dev)
 617                 return;
 618
 619         if (dep->dev)
 620                 device_remove_user(dep);
 621
 622         if (!dev)
 623                 return;
 624
 625         __device_add_user(dep, dev);
 626 }
 627
 628 void
 629 device_free(struct device *dev)
 630 {
 631         __devlock++;
 632         free(dev->config);
 633         device_cleanup(dev);
 634         dev->type->free(dev);
 635         __devlock--;
 636 }
 637
 638 static void
 639 __device_free_unused(struct device *dev)
 640 {
 641         if (!safe_list_empty(&dev->users) ||
 642                 !safe_list_empty(&dev->aliases) ||
 643             dev->current_config || __devlock)
 644                 return;
 645
 646         device_free(dev);
 647 }
 648
 649 void device_remove_user(struct device_user *dep)
 650 {
 651         struct device *dev = dep->dev;
 652
 653         if (!dep->dev)
 654                 return;
 655
 656         dep->hotplug = false;
 657         if (dep->claimed)
 658                 device_release(dep);
 659
 660         safe_list_del(&dep->list);
 661         dep->dev = NULL;
 662         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 663         __device_free_unused(dev);
 664 }
 665
 666 void
 667 device_free_unused(struct device *dev)
 668 {
 669         struct device *tmp;
 670
 671         if (dev)
 672                 return __device_free_unused(dev);
 673
 674         avl_for_each_element_safe(&devices, dev, avl, tmp)
 675                 __device_free_unused(dev);
 676 }
 677
 678 void
 679 device_init_pending(void)
 680 {
 681         struct device *dev, *tmp;
 682
 683         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 684                 if (!dev->config_pending)
 685                         continue;
 686
 687                 dev->type->config_init(dev);
 688                 dev->config_pending = false;
 689         }
 690 }
 691
 692 static enum dev_change_type
 693 device_set_config(struct device *dev, const struct device_type *type,
 694                   struct blob_attr *attr)
 695 {
 696         struct blob_attr *tb[__DEV_ATTR_MAX];
 697         const struct uci_blob_param_list *cfg = type->config_params;
 698
 699         if (type != dev->type)
 700                 return DEV_CONFIG_RECREATE;
 701
 702         if (dev->type->reload)
 703                 return dev->type->reload(dev, attr);
 704
 705         if (uci_blob_check_equal(dev->config, attr, cfg))
 706                 return DEV_CONFIG_NO_CHANGE;
 707
 708         if (cfg == &device_attr_list) {
 709                 memset(tb, 0, sizeof(tb));
 710
 711                 if (attr)
 712                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 713                                 blob_data(attr), blob_len(attr));
 714
 715                 device_init_settings(dev, tb);
 716                 return DEV_CONFIG_RESTART;
 717         } else
 718                 return DEV_CONFIG_RECREATE;
 719 }
 720
 721 enum dev_change_type
 722 device_apply_config(struct device *dev, const struct device_type *type,
 723                     struct blob_attr *config)
 724 {
 725         enum dev_change_type change;
 726
 727         change = device_set_config(dev, type, config);
 728         if (dev->external) {
 729                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 730                 change = DEV_CONFIG_APPLIED;
 731         }
 732
 733         switch (change) {
 734                 case DEV_CONFIG_RESTART:
 735                 case DEV_CONFIG_APPLIED:
 736                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 737                         config = blob_memdup(config);
 738                         free(dev->config);
 739                         dev->config = config;
 740                         if (change == DEV_CONFIG_RESTART && dev->present) {
 741                                 int ret = 0;
 742
 743                                 device_set_present(dev, false);
 744                                 if (dev->active && !dev->external) {
 745                                         ret = dev->set_state(dev, false);
 746                                         if (!ret)
 747                                                 ret = dev->set_state(dev, true);
 748                                 }
 749                                 if (!ret)
 750                                         device_set_present(dev, true);
 751                         }
 752                         break;
 753                 case DEV_CONFIG_NO_CHANGE:
 754                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 755                         break;
 756                 case DEV_CONFIG_RECREATE:
 757                         break;
 758         }
 759
 760         return change;
 761 }
 762
 763 static void
 764 device_replace(struct device *dev, struct device *odev)
 765 {
 766         struct device_user *dep, *tmp;
 767
 768         __devlock++;
 769         if (odev->present)
 770                 device_set_present(odev, false);
 771
 772         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 773                 device_release(dep);
 774                 safe_list_del(&dep->list);
 775                 __device_add_user(dep, dev);
 776         }
 777         __devlock--;
 778
 779         device_free(odev);
 780 }
 781
 782 void
 783 device_reset_config(void)
 784 {
 785         struct device *dev;
 786
 787         avl_for_each_element(&devices, dev, avl)
 788                 dev->current_config = false;
 789 }
 790
 791 void
 792 device_reset_old(void)
 793 {
 794         struct device *dev, *tmp, *ndev;
 795
 796         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 797                 if (dev->current_config || dev->default_config)
 798                         continue;
 799
 800                 if (dev->type != &simple_device_type)
 801                         continue;
 802
 803                 ndev = device_create_default(dev->ifname, dev->external);
 804                 if (!ndev)
 805                         continue;
 806
 807                 device_replace(ndev, dev);
 808         }
 809 }
 810
 811 void
 812 device_set_default_ps(bool state)
 813 {
 814         struct device *dev;
 815
 816         if (state == default_ps)
 817                 return;
 818
 819         default_ps = state;
 820
 821         avl_for_each_element(&devices, dev, avl) {
 822                 struct device_settings *s = &dev->settings;
 823                 unsigned int apply_mask = 0;
 824
 825                 if (!(s->flags & DEV_OPT_RPS)) {
 826                         s->rps = default_ps;
 827                         apply_mask |= DEV_OPT_RPS;
 828                 }
 829
 830                 if (!(s->flags & DEV_OPT_XPS)) {
 831                         s->xps = default_ps;
 832                         apply_mask |= DEV_OPT_XPS;
 833                 }
 834
 835                 if (!apply_mask)
 836                         continue;
 837
 838                 if (!(dev->external || (dev->present && dev->active)) ||
 839                                 dev->config_pending)
 840                         continue;
 841
 842                 system_if_apply_settings(dev, s, apply_mask);
 843         }
 844 }
 845
 846 struct device *
 847 device_create(const char *name, const struct device_type *type,
 848               struct blob_attr *config)
 849 {
 850         struct device *odev = NULL, *dev;
 851         enum dev_change_type change;
 852
 853         odev = device_get(name, false);
 854         if (odev) {
 855                 odev->current_config = true;
 856                 change = device_apply_config(odev, type, config);
 857                 switch (change) {
 858                 case DEV_CONFIG_RECREATE:
 859                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 860                         device_delete(odev);
 861                         break;
 862                 default:
 863                         return odev;
 864                 }
 865         } else
 866                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 867
 868         config = blob_memdup(config);
 869         if (!config)
 870                 return NULL;
 871
 872         dev = type->create(name, config);
 873         if (!dev)
 874                 return NULL;
 875
 876         dev->current_config = true;
 877         dev->config = config;
 878         if (odev)
 879                 device_replace(dev, odev);
 880
 881         if (!config_init && dev->config_pending) {
 882                 type->config_init(dev);
 883                 dev->config_pending = false;
 884         }
 885
 886         return dev;
 887 }
 888
 889 void
 890 device_dump_status(struct blob_buf *b, struct device *dev)
 891 {
 892         struct device_settings st;
 893         void *c, *s;
 894
 895         if (!dev) {
 896                 avl_for_each_element(&devices, dev, avl) {
 897                         if (!dev->present)
 898                                 continue;
 899                         c = blobmsg_open_table(b, dev->ifname);
 900                         device_dump_status(b, dev);
 901                         blobmsg_close_table(b, c);
 902                 }
 903
 904                 return;
 905         }
 906
 907         blobmsg_add_u8(b, "external", dev->external);
 908         blobmsg_add_u8(b, "present", dev->present);
 909         blobmsg_add_string(b, "type", dev->type->name);
 910
 911         if (!dev->present)
 912                 return;
 913
 914         blobmsg_add_u8(b, "up", !!dev->active);
 915         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 916
 917         if (dev->type->dump_info)
 918                 dev->type->dump_info(dev, b);
 919         else
 920                 system_if_dump_info(dev, b);
 921
 922         if (dev->active) {
 923                 device_merge_settings(dev, &st);
 924                 if (st.flags & DEV_OPT_MTU)
 925                         blobmsg_add_u32(b, "mtu", st.mtu);
 926                 if (st.flags & DEV_OPT_MTU6)
 927                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 928                 if (st.flags & DEV_OPT_MACADDR)
 929                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 930                 if (st.flags & DEV_OPT_TXQUEUELEN)
 931                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 932                 if (st.flags & DEV_OPT_IPV6)
 933                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 934                 if (st.flags & DEV_OPT_PROMISC)
 935                         blobmsg_add_u8(b, "promisc", st.promisc);
 936                 if (st.flags & DEV_OPT_RPFILTER)
 937                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 938                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 939                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 940                 if (st.flags & DEV_OPT_IGMPVERSION)
 941                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 942                 if (st.flags & DEV_OPT_MLDVERSION)
 943                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 944                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 945                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 946                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 947                 }
 948                 if (st.flags & DEV_OPT_DADTRANSMITS)
 949                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 950                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
 951                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
 952                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
 953                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
 954                 if (st.flags & DEV_OPT_MULTICAST)
 955                         blobmsg_add_u8(b, "multicast", st.multicast);
 956                 if (st.flags & DEV_OPT_LEARNING)
 957                         blobmsg_add_u8(b, "learning", st.learning);
 958                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
 959                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
 960         }
 961
 962         s = blobmsg_open_table(b, "statistics");
 963         if (dev->type->dump_stats)
 964                 dev->type->dump_stats(dev, b);
 965         else
 966                 system_if_dump_stats(dev, b);
 967         blobmsg_close_table(b, s);
 968 }