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_get(const char *name, int create)
 481 {
 482         struct device *dev;
 483
 484         if (strchr(name, '.'))
 485                 return get_vlan_device_chain(name, create);
 486
 487         if (name[0] == '@')
 488                 return device_alias_get(name + 1);
 489
 490         dev = avl_find_element(&devices, name, dev, avl);
 491         if (dev) {
 492                 if (create > 1 && !dev->external) {
 493                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 494                         dev->external = true;
 495                         device_set_present(dev, true);
 496                 }
 497                 return dev;
 498         }
 499
 500         if (!create)
 501                 return NULL;
 502
 503         return device_create_default(name, create > 1);
 504 }
 505
 506 static void
 507 device_delete(struct device *dev)
 508 {
 509         if (!dev->avl.key)
 510                 return;
 511
 512         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 513         avl_delete(&devices, &dev->avl);
 514         dev->avl.key = NULL;
 515 }
 516
 517 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 518 {
 519         struct device_user *dep = container_of(list, struct device_user, list);
 520         if (dep->cb)
 521                 dep->cb(dep, DEV_EVENT_REMOVE);
 522
 523         device_release(dep);
 524         return 0;
 525 }
 526
 527 void device_cleanup(struct device *dev)
 528 {
 529         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 530         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 531         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 532         device_delete(dev);
 533 }
 534
 535 static void __device_set_present(struct device *dev, bool state)
 536 {
 537         if (dev->present == state)
 538                 return;
 539
 540         dev->present = state;
 541         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 542 }
 543
 544 void
 545 device_refresh_present(struct device *dev)
 546 {
 547         bool state = dev->sys_present;
 548
 549         if (dev->disabled || dev->deferred)
 550                 state = false;
 551
 552         __device_set_present(dev, state);
 553 }
 554
 555 void device_set_present(struct device *dev, bool state)
 556 {
 557         if (dev->sys_present == state)
 558                 return;
 559
 560         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 561         dev->sys_present = state;
 562         device_refresh_present(dev);
 563 }
 564
 565 void device_set_link(struct device *dev, bool state)
 566 {
 567         if (dev->link_active == state)
 568                 return;
 569
 570         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 571
 572         dev->link_active = state;
 573         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 574 }
 575
 576 void device_set_ifindex(struct device *dev, int ifindex)
 577 {
 578         if (dev->ifindex == ifindex)
 579                 return;
 580
 581         dev->ifindex = ifindex;
 582         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 583 }
 584
 585 int device_set_ifname(struct device *dev, const char *name)
 586 {
 587         int ret = 0;
 588
 589         if (!strcmp(dev->ifname, name))
 590                 return 0;
 591
 592         if (dev->avl.key)
 593                 avl_delete(&devices, &dev->avl);
 594
 595         strncpy(dev->ifname, name, IFNAMSIZ);
 596
 597         if (dev->avl.key)
 598                 ret = avl_insert(&devices, &dev->avl);
 599
 600         if (ret == 0)
 601                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 602
 603         return ret;
 604 }
 605
 606 static int device_refcount(struct device *dev)
 607 {
 608         struct list_head *list;
 609         int count = 0;
 610
 611         list_for_each(list, &dev->users.list)
 612                 count++;
 613
 614         list_for_each(list, &dev->aliases.list)
 615                 count++;
 616
 617         return count;
 618 }
 619
 620 static void
 621 __device_add_user(struct device_user *dep, struct device *dev)
 622 {
 623         struct safe_list *head;
 624
 625         dep->dev = dev;
 626
 627         if (dep->alias)
 628                 head = &dev->aliases;
 629         else
 630                 head = &dev->users;
 631
 632         safe_list_add(&dep->list, head);
 633         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 634
 635         if (dep->cb && dev->present) {
 636                 dep->cb(dep, DEV_EVENT_ADD);
 637                 if (dev->active)
 638                         dep->cb(dep, DEV_EVENT_UP);
 639
 640                 if (dev->link_active)
 641                         dep->cb(dep, DEV_EVENT_LINK_UP);
 642         }
 643 }
 644
 645 void device_add_user(struct device_user *dep, struct device *dev)
 646 {
 647         if (dep->dev == dev)
 648                 return;
 649
 650         if (dep->dev)
 651                 device_remove_user(dep);
 652
 653         if (!dev)
 654                 return;
 655
 656         __device_add_user(dep, dev);
 657 }
 658
 659 void
 660 device_free(struct device *dev)
 661 {
 662         __devlock++;
 663         free(dev->config);
 664         device_cleanup(dev);
 665         dev->type->free(dev);
 666         __devlock--;
 667 }
 668
 669 static void
 670 __device_free_unused(struct device *dev)
 671 {
 672         if (!safe_list_empty(&dev->users) ||
 673                 !safe_list_empty(&dev->aliases) ||
 674             dev->current_config || __devlock)
 675                 return;
 676
 677         device_free(dev);
 678 }
 679
 680 void device_remove_user(struct device_user *dep)
 681 {
 682         struct device *dev = dep->dev;
 683
 684         if (!dep->dev)
 685                 return;
 686
 687         dep->hotplug = false;
 688         if (dep->claimed)
 689                 device_release(dep);
 690
 691         safe_list_del(&dep->list);
 692         dep->dev = NULL;
 693         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 694         __device_free_unused(dev);
 695 }
 696
 697 void
 698 device_free_unused(struct device *dev)
 699 {
 700         struct device *tmp;
 701
 702         if (dev)
 703                 return __device_free_unused(dev);
 704
 705         avl_for_each_element_safe(&devices, dev, avl, tmp)
 706                 __device_free_unused(dev);
 707 }
 708
 709 void
 710 device_init_pending(void)
 711 {
 712         struct device *dev, *tmp;
 713
 714         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 715                 if (!dev->config_pending)
 716                         continue;
 717
 718                 dev->type->config_init(dev);
 719                 dev->config_pending = false;
 720         }
 721 }
 722
 723 static enum dev_change_type
 724 device_set_config(struct device *dev, const struct device_type *type,
 725                   struct blob_attr *attr)
 726 {
 727         struct blob_attr *tb[__DEV_ATTR_MAX];
 728         const struct uci_blob_param_list *cfg = type->config_params;
 729
 730         if (type != dev->type)
 731                 return DEV_CONFIG_RECREATE;
 732
 733         if (dev->type->reload)
 734                 return dev->type->reload(dev, attr);
 735
 736         if (uci_blob_check_equal(dev->config, attr, cfg))
 737                 return DEV_CONFIG_NO_CHANGE;
 738
 739         if (cfg == &device_attr_list) {
 740                 memset(tb, 0, sizeof(tb));
 741
 742                 if (attr)
 743                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 744                                 blob_data(attr), blob_len(attr));
 745
 746                 device_init_settings(dev, tb);
 747                 return DEV_CONFIG_RESTART;
 748         } else
 749                 return DEV_CONFIG_RECREATE;
 750 }
 751
 752 enum dev_change_type
 753 device_apply_config(struct device *dev, const struct device_type *type,
 754                     struct blob_attr *config)
 755 {
 756         enum dev_change_type change;
 757
 758         change = device_set_config(dev, type, config);
 759         if (dev->external) {
 760                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 761                 change = DEV_CONFIG_APPLIED;
 762         }
 763
 764         switch (change) {
 765                 case DEV_CONFIG_RESTART:
 766                 case DEV_CONFIG_APPLIED:
 767                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 768                         config = blob_memdup(config);
 769                         free(dev->config);
 770                         dev->config = config;
 771                         if (change == DEV_CONFIG_RESTART && dev->present) {
 772                                 int ret = 0;
 773
 774                                 device_set_present(dev, false);
 775                                 if (dev->active && !dev->external) {
 776                                         ret = dev->set_state(dev, false);
 777                                         if (!ret)
 778                                                 ret = dev->set_state(dev, true);
 779                                 }
 780                                 if (!ret)
 781                                         device_set_present(dev, true);
 782                         }
 783                         break;
 784                 case DEV_CONFIG_NO_CHANGE:
 785                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 786                         break;
 787                 case DEV_CONFIG_RECREATE:
 788                         break;
 789         }
 790
 791         return change;
 792 }
 793
 794 static void
 795 device_replace(struct device *dev, struct device *odev)
 796 {
 797         struct device_user *dep, *tmp;
 798
 799         __devlock++;
 800         if (odev->present)
 801                 device_set_present(odev, false);
 802
 803         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 804                 device_release(dep);
 805                 safe_list_del(&dep->list);
 806                 __device_add_user(dep, dev);
 807         }
 808         __devlock--;
 809
 810         device_free(odev);
 811 }
 812
 813 void
 814 device_reset_config(void)
 815 {
 816         struct device *dev;
 817
 818         avl_for_each_element(&devices, dev, avl)
 819                 dev->current_config = false;
 820 }
 821
 822 void
 823 device_reset_old(void)
 824 {
 825         struct device *dev, *tmp, *ndev;
 826
 827         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 828                 if (dev->current_config || dev->default_config)
 829                         continue;
 830
 831                 if (dev->type != &simple_device_type)
 832                         continue;
 833
 834                 ndev = device_create_default(dev->ifname, dev->external);
 835                 if (!ndev)
 836                         continue;
 837
 838                 device_replace(ndev, dev);
 839         }
 840 }
 841
 842 void
 843 device_set_default_ps(bool state)
 844 {
 845         struct device *dev;
 846
 847         if (state == default_ps)
 848                 return;
 849
 850         default_ps = state;
 851
 852         avl_for_each_element(&devices, dev, avl) {
 853                 struct device_settings *s = &dev->settings;
 854                 unsigned int apply_mask = 0;
 855
 856                 if (!(s->flags & DEV_OPT_RPS)) {
 857                         s->rps = default_ps;
 858                         apply_mask |= DEV_OPT_RPS;
 859                 }
 860
 861                 if (!(s->flags & DEV_OPT_XPS)) {
 862                         s->xps = default_ps;
 863                         apply_mask |= DEV_OPT_XPS;
 864                 }
 865
 866                 if (!apply_mask)
 867                         continue;
 868
 869                 if (!(dev->external || (dev->present && dev->active)) ||
 870                                 dev->config_pending)
 871                         continue;
 872
 873                 system_if_apply_settings(dev, s, apply_mask);
 874         }
 875 }
 876
 877 struct device *
 878 device_create(const char *name, const struct device_type *type,
 879               struct blob_attr *config)
 880 {
 881         struct device *odev = NULL, *dev;
 882         enum dev_change_type change;
 883
 884         odev = device_get(name, false);
 885         if (odev) {
 886                 odev->current_config = true;
 887                 change = device_apply_config(odev, type, config);
 888                 switch (change) {
 889                 case DEV_CONFIG_RECREATE:
 890                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 891                         device_delete(odev);
 892                         break;
 893                 default:
 894                         return odev;
 895                 }
 896         } else
 897                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 898
 899         config = blob_memdup(config);
 900         if (!config)
 901                 return NULL;
 902
 903         dev = type->create(name, config);
 904         if (!dev)
 905                 return NULL;
 906
 907         dev->current_config = true;
 908         dev->config = config;
 909         if (odev)
 910                 device_replace(dev, odev);
 911
 912         if (!config_init && dev->config_pending) {
 913                 type->config_init(dev);
 914                 dev->config_pending = false;
 915         }
 916
 917         return dev;
 918 }
 919
 920 void
 921 device_dump_status(struct blob_buf *b, struct device *dev)
 922 {
 923         struct device_settings st;
 924         void *c, *s;
 925
 926         if (!dev) {
 927                 avl_for_each_element(&devices, dev, avl) {
 928                         if (!dev->present)
 929                                 continue;
 930                         c = blobmsg_open_table(b, dev->ifname);
 931                         device_dump_status(b, dev);
 932                         blobmsg_close_table(b, c);
 933                 }
 934
 935                 return;
 936         }
 937
 938         blobmsg_add_u8(b, "external", dev->external);
 939         blobmsg_add_u8(b, "present", dev->present);
 940         blobmsg_add_string(b, "type", dev->type->name);
 941
 942         if (!dev->present)
 943                 return;
 944
 945         blobmsg_add_u8(b, "up", !!dev->active);
 946         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 947
 948         if (dev->type->dump_info)
 949                 dev->type->dump_info(dev, b);
 950         else
 951                 system_if_dump_info(dev, b);
 952
 953         if (dev->active) {
 954                 device_merge_settings(dev, &st);
 955                 if (st.flags & DEV_OPT_MTU)
 956                         blobmsg_add_u32(b, "mtu", st.mtu);
 957                 if (st.flags & DEV_OPT_MTU6)
 958                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 959                 if (st.flags & DEV_OPT_MACADDR)
 960                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 961                 if (st.flags & DEV_OPT_TXQUEUELEN)
 962                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 963                 if (st.flags & DEV_OPT_IPV6)
 964                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 965                 if (st.flags & DEV_OPT_PROMISC)
 966                         blobmsg_add_u8(b, "promisc", st.promisc);
 967                 if (st.flags & DEV_OPT_RPFILTER)
 968                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 969                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 970                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 971                 if (st.flags & DEV_OPT_IGMPVERSION)
 972                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 973                 if (st.flags & DEV_OPT_MLDVERSION)
 974                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 975                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
 976                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
 977                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
 978                 }
 979                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
 980                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
 981                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
 982                 }
 983                 if (st.flags & DEV_OPT_DADTRANSMITS)
 984                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
 985                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
 986                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
 987                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
 988                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
 989                 if (st.flags & DEV_OPT_MULTICAST)
 990                         blobmsg_add_u8(b, "multicast", st.multicast);
 991                 if (st.flags & DEV_OPT_LEARNING)
 992                         blobmsg_add_u8(b, "learning", st.learning);
 993                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
 994                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
 995         }
 996
 997         s = blobmsg_open_table(b, "statistics");
 998         if (dev->type->dump_stats)
 999                 dev->type->dump_stats(dev, b);
1000         else
1001                 system_if_dump_stats(dev, b);
1002         blobmsg_close_table(b, s);
1003 }