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 <libubox/list.h>
  28
  29 #include "netifd.h"
  30 #include "system.h"
  31 #include "config.h"
  32
  33 static struct list_head devtypes = LIST_HEAD_INIT(devtypes);
  34 static struct avl_tree devices;
  35
  36 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  37         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  38         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  39         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  40         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  41         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  42         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  44         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  45         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  46         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  47         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  48         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  49         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  50         [DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  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_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
  55         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  56         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  57         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  58         [DEV_ATTR_SENDREDIRECTS] = { .name = "sendredirects", .type = BLOBMSG_TYPE_BOOL },
  59         [DEV_ATTR_NEIGHLOCKTIME] = { .name = "neighlocktime", .type = BLOBMSG_TYPE_INT32 },
  60         [DEV_ATTR_ISOLATE] = { .name = "isolate", .type = BLOBMSG_TYPE_BOOL },
  61 };
  62
  63 const struct uci_blob_param_list device_attr_list = {
  64         .n_params = __DEV_ATTR_MAX,
  65         .params = dev_attrs,
  66 };
  67
  68 static int __devlock = 0;
  69
  70 int device_type_add(struct device_type *devtype)
  71 {
  72         if (device_type_get(devtype->name)) {
  73                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  74                                    devtype->name);
  75                 return 1;
  76         }
  77
  78         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  79                 devtype->name);
  80
  81         list_add(&devtype->list, &devtypes);
  82         return 0;
  83 }
  84
  85 /* Retrieve the device type for the given name. If 'bridge' is true, the type
  86  * must have bridge capabilities
  87  */
  88 struct device_type *
  89 device_type_get(const char *tname)
  90 {
  91         struct device_type *cur;
  92
  93         list_for_each_entry(cur, &devtypes, list)
  94                 if (!strcmp(cur->name, tname))
  95                         return cur;
  96
  97         return NULL;
  98 }
  99
 100 void device_lock(void)
 101 {
 102         __devlock++;
 103 }
 104
 105 void device_unlock(void)
 106 {
 107         __devlock--;
 108         if (!__devlock)
 109                 device_free_unused(NULL);
 110 }
 111
 112 static int set_device_state(struct device *dev, bool state)
 113 {
 114         if (state) {
 115                 /* Get ifindex for all devices being enabled so a valid  */
 116                 /* ifindex is in place avoiding possible race conditions */
 117                 device_set_ifindex(dev, system_if_resolve(dev));
 118                 if (!dev->ifindex)
 119                         return -1;
 120
 121                 system_if_up(dev);
 122         }
 123         else
 124                 system_if_down(dev);
 125
 126         return 0;
 127 }
 128
 129 static int
 130 simple_device_set_state(struct device *dev, bool state)
 131 {
 132         struct device *pdev;
 133         int ret = 0;
 134
 135         pdev = dev->parent.dev;
 136         if (state && !pdev) {
 137                 pdev = system_if_get_parent(dev);
 138                 if (pdev)
 139                         device_add_user(&dev->parent, pdev);
 140         }
 141
 142         if (pdev) {
 143                 if (state)
 144                         ret = device_claim(&dev->parent);
 145                 else
 146                         device_release(&dev->parent);
 147
 148                 if (ret < 0)
 149                         return ret;
 150         }
 151         return set_device_state(dev, state);
 152 }
 153
 154 static struct device *
 155 simple_device_create(const char *name, struct device_type *devtype,
 156                      struct blob_attr *attr)
 157 {
 158         struct blob_attr *tb[__DEV_ATTR_MAX];
 159         struct device *dev = NULL;
 160
 161         /* device type is unused for simple devices */
 162         devtype = NULL;
 163
 164         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 165         dev = device_get(name, true);
 166         if (!dev)
 167                 return NULL;
 168
 169         dev->set_state = simple_device_set_state;
 170         device_init_settings(dev, tb);
 171
 172         return dev;
 173 }
 174
 175 static void simple_device_free(struct device *dev)
 176 {
 177         if (dev->parent.dev)
 178                 device_remove_user(&dev->parent);
 179         free(dev);
 180 }
 181
 182 struct device_type simple_device_type = {
 183         .name = "Network device",
 184         .config_params = &device_attr_list,
 185
 186         .create = simple_device_create,
 187         .check_state = system_if_check,
 188         .free = simple_device_free,
 189 };
 190
 191 void
 192 device_merge_settings(struct device *dev, struct device_settings *n)
 193 {
 194         struct device_settings *os = &dev->orig_settings;
 195         struct device_settings *s = &dev->settings;
 196
 197         memset(n, 0, sizeof(*n));
 198         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 199         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 200         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 201                 s->txqueuelen : os->txqueuelen;
 202         memcpy(n->macaddr,
 203                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 204                 sizeof(n->macaddr));
 205         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 206         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 207         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 208         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 209         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 210         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 211         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 212                 s->neigh4reachabletime : os->neigh4reachabletime;
 213         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 214                 s->neigh6reachabletime : os->neigh6reachabletime;
 215         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 216                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 217         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 218                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 219         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 220                 s->neigh4locktime : os->neigh4locktime;
 221         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 222                 s->dadtransmits : os->dadtransmits;
 223         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 224                 s->multicast : os->multicast;
 225         n->multicast_to_unicast = s->multicast_to_unicast;
 226         n->multicast_router = s->multicast_router;
 227         n->multicast_fast_leave = s->multicast_fast_leave;
 228         n->learning = s->learning;
 229         n->unicast_flood = s->unicast_flood;
 230         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 231                 s->sendredirects : os->sendredirects;
 232         n->flags = s->flags | os->flags | os->valid_flags;
 233 }
 234
 235 void
 236 device_init_settings(struct device *dev, struct blob_attr **tb)
 237 {
 238         struct device_settings *s = &dev->settings;
 239         struct blob_attr *cur;
 240         struct ether_addr *ea;
 241         bool disabled = false;
 242
 243         s->flags = 0;
 244         if ((cur = tb[DEV_ATTR_ENABLED]))
 245                 disabled = !blobmsg_get_bool(cur);
 246
 247         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 248                 s->mtu = blobmsg_get_u32(cur);
 249                 s->flags |= DEV_OPT_MTU;
 250         }
 251
 252         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 253                 s->mtu6 = blobmsg_get_u32(cur);
 254                 s->flags |= DEV_OPT_MTU6;
 255         }
 256
 257         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 258                 s->txqueuelen = blobmsg_get_u32(cur);
 259                 s->flags |= DEV_OPT_TXQUEUELEN;
 260         }
 261
 262         if ((cur = tb[DEV_ATTR_MACADDR])) {
 263                 ea = ether_aton(blobmsg_data(cur));
 264                 if (ea) {
 265                         memcpy(s->macaddr, ea, 6);
 266                         s->flags |= DEV_OPT_MACADDR;
 267                 }
 268         }
 269
 270         if ((cur = tb[DEV_ATTR_IPV6])) {
 271                 s->ipv6 = blobmsg_get_bool(cur);
 272                 s->flags |= DEV_OPT_IPV6;
 273         }
 274
 275         if ((cur = tb[DEV_ATTR_PROMISC])) {
 276                 s->promisc = blobmsg_get_bool(cur);
 277                 s->flags |= DEV_OPT_PROMISC;
 278         }
 279
 280         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 281                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 282                         s->flags |= DEV_OPT_RPFILTER;
 283                 else
 284                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 285         }
 286
 287         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 288                 s->acceptlocal = blobmsg_get_bool(cur);
 289                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 290         }
 291
 292         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 293                 s->igmpversion = blobmsg_get_u32(cur);
 294                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 295                         s->flags |= DEV_OPT_IGMPVERSION;
 296                 else
 297                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 298         }
 299
 300         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 301                 s->mldversion = blobmsg_get_u32(cur);
 302                 if (s->mldversion >= 1 && s->mldversion <= 2)
 303                         s->flags |= DEV_OPT_MLDVERSION;
 304                 else
 305                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 306         }
 307
 308         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 309                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 310                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 311         }
 312
 313         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 314                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 315                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 316         }
 317
 318         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 319                 s->neigh4locktime = blobmsg_get_u32(cur);
 320                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 321         }
 322
 323         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 324                 s->dadtransmits = blobmsg_get_u32(cur);
 325                 s->flags |= DEV_OPT_DADTRANSMITS;
 326         }
 327
 328         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 329                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 330                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 331         }
 332
 333         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 334                 s->multicast_router = blobmsg_get_u32(cur);
 335                 if (s->multicast_router <= 2)
 336                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 337                 else
 338                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 339         }
 340
 341         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 342                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 343                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 344         }
 345
 346         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 347                 s->multicast = blobmsg_get_bool(cur);
 348                 s->flags |= DEV_OPT_MULTICAST;
 349         }
 350
 351         if ((cur = tb[DEV_ATTR_LEARNING])) {
 352                 s->learning = blobmsg_get_bool(cur);
 353                 s->flags |= DEV_OPT_LEARNING;
 354         }
 355
 356         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 357                 s->unicast_flood = blobmsg_get_bool(cur);
 358                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 359         }
 360
 361         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 362                 s->sendredirects = blobmsg_get_bool(cur);
 363                 s->flags |= DEV_OPT_SENDREDIRECTS;
 364         }
 365
 366         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 367                 s->isolate = blobmsg_get_bool(cur);
 368                 s->flags |= DEV_OPT_ISOLATE;
 369         }
 370
 371         device_set_disabled(dev, disabled);
 372 }
 373
 374 static void __init dev_init(void)
 375 {
 376         avl_init(&devices, avl_strcmp, true, NULL);
 377 }
 378
 379 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 380 {
 381         struct device_user *dep = container_of(list, struct device_user, list);
 382         int *ev = ctx;
 383
 384         /* device might have been removed by an earlier callback */
 385         if (!dep->dev)
 386                 return 0;
 387
 388         if (dep->cb)
 389                 dep->cb(dep, *ev);
 390         return 0;
 391 }
 392
 393 void device_broadcast_event(struct device *dev, enum device_event ev)
 394 {
 395         int dev_ev = ev;
 396
 397         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 398         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 399 }
 400
 401 int device_claim(struct device_user *dep)
 402 {
 403         struct device *dev = dep->dev;
 404         int ret = 0;
 405
 406         if (dep->claimed)
 407                 return 0;
 408
 409         if (!dev)
 410                 return -1;
 411
 412         dep->claimed = true;
 413         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 414         if (++dev->active != 1)
 415                 return 0;
 416
 417         device_broadcast_event(dev, DEV_EVENT_SETUP);
 418         if (dev->external) {
 419                 /* Get ifindex for external claimed devices so a valid   */
 420                 /* ifindex is in place avoiding possible race conditions */
 421                 device_set_ifindex(dev, system_if_resolve(dev));
 422                 if (!dev->ifindex)
 423                         ret = -1;
 424
 425                 system_if_get_settings(dev, &dev->orig_settings);
 426         } else
 427                 ret = dev->set_state(dev, true);
 428
 429         if (ret == 0)
 430                 device_broadcast_event(dev, DEV_EVENT_UP);
 431         else {
 432                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 433                 dev->active = 0;
 434                 dep->claimed = false;
 435         }
 436
 437         return ret;
 438 }
 439
 440 void device_release(struct device_user *dep)
 441 {
 442         struct device *dev = dep->dev;
 443
 444         if (!dep->claimed)
 445                 return;
 446
 447         dep->claimed = false;
 448         dev->active--;
 449         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 450         assert(dev->active >= 0);
 451
 452         if (dev->active)
 453                 return;
 454
 455         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 456         if (!dev->external)
 457                 dev->set_state(dev, false);
 458
 459         if (dev->active)
 460                 return;
 461
 462         device_broadcast_event(dev, DEV_EVENT_DOWN);
 463 }
 464
 465 int device_check_state(struct device *dev)
 466 {
 467         if (!dev->type->check_state)
 468                 return simple_device_type.check_state(dev);
 469
 470         return dev->type->check_state(dev);
 471 }
 472
 473 int device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 474 {
 475         assert(dev);
 476         assert(type);
 477
 478         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 479         INIT_SAFE_LIST(&dev->users);
 480         INIT_SAFE_LIST(&dev->aliases);
 481         dev->type = type;
 482
 483         if (name) {
 484                 int ret;
 485
 486                 ret = device_set_ifname(dev, name);
 487                 if (ret < 0)
 488                         return ret;
 489         }
 490
 491         if (!dev->set_state)
 492                 dev->set_state = set_device_state;
 493
 494         return 0;
 495 }
 496
 497 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 498 {
 499         int ret;
 500
 501         ret = device_init_virtual(dev, type, ifname);
 502         if (ret < 0)
 503                 return ret;
 504
 505         dev->avl.key = dev->ifname;
 506
 507         ret = avl_insert(&devices, &dev->avl);
 508         if (ret < 0)
 509                 return ret;
 510
 511         system_if_clear_state(dev);
 512
 513         return 0;
 514 }
 515
 516 static struct device *
 517 device_create_default(const char *name, bool external)
 518 {
 519         struct device *dev;
 520
 521         if (!external && system_if_force_external(name))
 522                 return NULL;
 523
 524         D(DEVICE, "Create simple device '%s'\n", name);
 525         dev = calloc(1, sizeof(*dev));
 526         if (!dev)
 527                 return NULL;
 528
 529         dev->external = external;
 530         dev->set_state = simple_device_set_state;
 531
 532         if (device_init(dev, &simple_device_type, name) < 0) {
 533                 device_cleanup(dev);
 534                 free(dev);
 535                 return NULL;
 536         }
 537
 538         dev->default_config = true;
 539         if (external)
 540                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 541
 542         device_check_state(dev);
 543
 544         return dev;
 545 }
 546
 547 struct device *
 548 device_find(const char *name)
 549 {
 550         struct device *dev;
 551
 552         return avl_find_element(&devices, name, dev, avl);
 553 }
 554
 555 struct device *
 556 device_get(const char *name, int create)
 557 {
 558         struct device *dev;
 559
 560         if (strchr(name, '.'))
 561                 return get_vlan_device_chain(name, create);
 562
 563         if (name[0] == '@')
 564                 return device_alias_get(name + 1);
 565
 566         dev = avl_find_element(&devices, name, dev, avl);
 567         if (dev) {
 568                 if (create > 1 && !dev->external) {
 569                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 570                         dev->external = true;
 571                         device_set_present(dev, true);
 572                 }
 573                 return dev;
 574         }
 575
 576         if (!create)
 577                 return NULL;
 578
 579         return device_create_default(name, create > 1);
 580 }
 581
 582 static void
 583 device_delete(struct device *dev)
 584 {
 585         if (!dev->avl.key)
 586                 return;
 587
 588         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 589         avl_delete(&devices, &dev->avl);
 590         dev->avl.key = NULL;
 591 }
 592
 593 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 594 {
 595         struct device_user *dep = container_of(list, struct device_user, list);
 596         if (dep->cb)
 597                 dep->cb(dep, DEV_EVENT_REMOVE);
 598
 599         device_release(dep);
 600         return 0;
 601 }
 602
 603 void device_cleanup(struct device *dev)
 604 {
 605         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 606         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 607         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 608         device_delete(dev);
 609 }
 610
 611 static void __device_set_present(struct device *dev, bool state)
 612 {
 613         if (dev->present == state)
 614                 return;
 615
 616         dev->present = state;
 617         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 618 }
 619
 620 void
 621 device_refresh_present(struct device *dev)
 622 {
 623         bool state = dev->sys_present;
 624
 625         if (dev->disabled || dev->deferred)
 626                 state = false;
 627
 628         __device_set_present(dev, state);
 629 }
 630
 631 void device_set_present(struct device *dev, bool state)
 632 {
 633         if (dev->sys_present == state)
 634                 return;
 635
 636         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 637         dev->sys_present = state;
 638         device_refresh_present(dev);
 639 }
 640
 641 void device_set_link(struct device *dev, bool state)
 642 {
 643         if (dev->link_active == state)
 644                 return;
 645
 646         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 647
 648         dev->link_active = state;
 649         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 650 }
 651
 652 void device_set_ifindex(struct device *dev, int ifindex)
 653 {
 654         if (dev->ifindex == ifindex)
 655                 return;
 656
 657         dev->ifindex = ifindex;
 658         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 659 }
 660
 661 int device_set_ifname(struct device *dev, const char *name)
 662 {
 663         int ret = 0;
 664
 665         if (!strcmp(dev->ifname, name))
 666                 return 0;
 667
 668         if (strlen(name) > sizeof(dev->ifname) - 1)
 669                 return -1;
 670
 671         if (dev->avl.key)
 672                 avl_delete(&devices, &dev->avl);
 673
 674         strcpy(dev->ifname, name);
 675
 676         if (dev->avl.key)
 677                 ret = avl_insert(&devices, &dev->avl);
 678
 679         if (ret == 0)
 680                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 681
 682         return ret;
 683 }
 684
 685 static int device_refcount(struct device *dev)
 686 {
 687         struct list_head *list;
 688         int count = 0;
 689
 690         list_for_each(list, &dev->users.list)
 691                 count++;
 692
 693         list_for_each(list, &dev->aliases.list)
 694                 count++;
 695
 696         return count;
 697 }
 698
 699 static void
 700 __device_add_user(struct device_user *dep, struct device *dev)
 701 {
 702         struct safe_list *head;
 703
 704         dep->dev = dev;
 705
 706         if (dep->alias)
 707                 head = &dev->aliases;
 708         else
 709                 head = &dev->users;
 710
 711         safe_list_add(&dep->list, head);
 712         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 713
 714         if (dep->cb && dev->present) {
 715                 dep->cb(dep, DEV_EVENT_ADD);
 716                 if (dev->active)
 717                         dep->cb(dep, DEV_EVENT_UP);
 718
 719                 if (dev->link_active)
 720                         dep->cb(dep, DEV_EVENT_LINK_UP);
 721         }
 722 }
 723
 724 void device_add_user(struct device_user *dep, struct device *dev)
 725 {
 726         if (dep->dev == dev)
 727                 return;
 728
 729         if (dep->dev)
 730                 device_remove_user(dep);
 731
 732         if (!dev)
 733                 return;
 734
 735         __device_add_user(dep, dev);
 736 }
 737
 738 static void
 739 device_free(struct device *dev)
 740 {
 741         __devlock++;
 742         free(dev->config);
 743         device_cleanup(dev);
 744         dev->type->free(dev);
 745         __devlock--;
 746 }
 747
 748 static void
 749 __device_free_unused(struct device *dev)
 750 {
 751         if (!safe_list_empty(&dev->users) ||
 752                 !safe_list_empty(&dev->aliases) ||
 753             dev->current_config || __devlock)
 754                 return;
 755
 756         device_free(dev);
 757 }
 758
 759 void device_remove_user(struct device_user *dep)
 760 {
 761         struct device *dev = dep->dev;
 762
 763         if (!dep->dev)
 764                 return;
 765
 766         dep->hotplug = false;
 767         if (dep->claimed)
 768                 device_release(dep);
 769
 770         safe_list_del(&dep->list);
 771         dep->dev = NULL;
 772         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 773         __device_free_unused(dev);
 774 }
 775
 776 void
 777 device_free_unused(struct device *dev)
 778 {
 779         struct device *tmp;
 780
 781         if (dev)
 782                 return __device_free_unused(dev);
 783
 784         avl_for_each_element_safe(&devices, dev, avl, tmp)
 785                 __device_free_unused(dev);
 786 }
 787
 788 void
 789 device_init_pending(void)
 790 {
 791         struct device *dev, *tmp;
 792
 793         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 794                 if (!dev->config_pending)
 795                         continue;
 796
 797                 dev->type->config_init(dev);
 798                 dev->config_pending = false;
 799                 device_check_state(dev);
 800         }
 801 }
 802
 803 static enum dev_change_type
 804 device_set_config(struct device *dev, struct device_type *type,
 805                   struct blob_attr *attr)
 806 {
 807         struct blob_attr *tb[__DEV_ATTR_MAX];
 808         const struct uci_blob_param_list *cfg = type->config_params;
 809
 810         if (type != dev->type)
 811                 return DEV_CONFIG_RECREATE;
 812
 813         if (dev->type->reload)
 814                 return dev->type->reload(dev, attr);
 815
 816         if (uci_blob_check_equal(dev->config, attr, cfg))
 817                 return DEV_CONFIG_NO_CHANGE;
 818
 819         if (cfg == &device_attr_list) {
 820                 memset(tb, 0, sizeof(tb));
 821
 822                 if (attr)
 823                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 824                                 blob_data(attr), blob_len(attr));
 825
 826                 device_init_settings(dev, tb);
 827                 return DEV_CONFIG_RESTART;
 828         } else
 829                 return DEV_CONFIG_RECREATE;
 830 }
 831
 832 enum dev_change_type
 833 device_apply_config(struct device *dev, struct device_type *type,
 834                     struct blob_attr *config)
 835 {
 836         enum dev_change_type change;
 837
 838         change = device_set_config(dev, type, config);
 839         if (dev->external) {
 840                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 841                 change = DEV_CONFIG_APPLIED;
 842         }
 843
 844         switch (change) {
 845                 case DEV_CONFIG_RESTART:
 846                 case DEV_CONFIG_APPLIED:
 847                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 848                         config = blob_memdup(config);
 849                         free(dev->config);
 850                         dev->config = config;
 851                         if (change == DEV_CONFIG_RESTART && dev->present) {
 852                                 int ret = 0;
 853
 854                                 device_set_present(dev, false);
 855                                 if (dev->active && !dev->external) {
 856                                         ret = dev->set_state(dev, false);
 857                                         if (!ret)
 858                                                 ret = dev->set_state(dev, true);
 859                                 }
 860                                 if (!ret)
 861                                         device_set_present(dev, true);
 862                         }
 863                         break;
 864                 case DEV_CONFIG_NO_CHANGE:
 865                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 866                         break;
 867                 case DEV_CONFIG_RECREATE:
 868                         break;
 869         }
 870
 871         return change;
 872 }
 873
 874 static void
 875 device_replace(struct device *dev, struct device *odev)
 876 {
 877         struct device_user *dep, *tmp;
 878
 879         __devlock++;
 880         if (odev->present)
 881                 device_set_present(odev, false);
 882
 883         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 884                 device_release(dep);
 885                 safe_list_del(&dep->list);
 886                 __device_add_user(dep, dev);
 887         }
 888         __devlock--;
 889
 890         device_free(odev);
 891 }
 892
 893 void
 894 device_reset_config(void)
 895 {
 896         struct device *dev;
 897
 898         avl_for_each_element(&devices, dev, avl)
 899                 dev->current_config = false;
 900 }
 901
 902 void
 903 device_reset_old(void)
 904 {
 905         struct device *dev, *tmp, *ndev;
 906
 907         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 908                 if (dev->current_config || dev->default_config)
 909                         continue;
 910
 911                 if (dev->type != &simple_device_type)
 912                         continue;
 913
 914                 ndev = device_create_default(dev->ifname, dev->external);
 915                 if (!ndev)
 916                         continue;
 917
 918                 device_replace(ndev, dev);
 919         }
 920 }
 921
 922 struct device *
 923 device_create(const char *name, struct device_type *type,
 924               struct blob_attr *config)
 925 {
 926         struct device *odev = NULL, *dev;
 927         enum dev_change_type change;
 928
 929         odev = device_find(name);
 930         if (odev) {
 931                 odev->current_config = true;
 932                 change = device_apply_config(odev, type, config);
 933                 switch (change) {
 934                 case DEV_CONFIG_RECREATE:
 935                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 936                         device_delete(odev);
 937                         break;
 938                 default:
 939                         return odev;
 940                 }
 941         } else
 942                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 943
 944         config = blob_memdup(config);
 945         if (!config)
 946                 return NULL;
 947
 948         dev = type->create(name, type, config);
 949         if (!dev)
 950                 return NULL;
 951
 952         dev->current_config = true;
 953         dev->config = config;
 954         if (odev)
 955                 device_replace(dev, odev);
 956
 957         if (!config_init && dev->config_pending) {
 958                 type->config_init(dev);
 959                 dev->config_pending = false;
 960         }
 961
 962         device_check_state(dev);
 963
 964         return dev;
 965 }
 966
 967 void
 968 device_dump_status(struct blob_buf *b, struct device *dev)
 969 {
 970         struct device_settings st;
 971         void *c, *s;
 972
 973         if (!dev) {
 974                 avl_for_each_element(&devices, dev, avl) {
 975                         if (!dev->present)
 976                                 continue;
 977                         c = blobmsg_open_table(b, dev->ifname);
 978                         device_dump_status(b, dev);
 979                         blobmsg_close_table(b, c);
 980                 }
 981
 982                 return;
 983         }
 984
 985         blobmsg_add_u8(b, "external", dev->external);
 986         blobmsg_add_u8(b, "present", dev->present);
 987         blobmsg_add_string(b, "type", dev->type->name);
 988
 989         if (!dev->present)
 990                 return;
 991
 992         blobmsg_add_u8(b, "up", !!dev->active);
 993         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 994
 995         if (dev->type->dump_info)
 996                 dev->type->dump_info(dev, b);
 997         else
 998                 system_if_dump_info(dev, b);
 999
1000         if (dev->active) {
1001                 device_merge_settings(dev, &st);
1002                 if (st.flags & DEV_OPT_MTU)
1003                         blobmsg_add_u32(b, "mtu", st.mtu);
1004                 if (st.flags & DEV_OPT_MTU6)
1005                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1006                 if (st.flags & DEV_OPT_MACADDR)
1007                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1008                 if (st.flags & DEV_OPT_TXQUEUELEN)
1009                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1010                 if (st.flags & DEV_OPT_IPV6)
1011                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1012                 if (st.flags & DEV_OPT_PROMISC)
1013                         blobmsg_add_u8(b, "promisc", st.promisc);
1014                 if (st.flags & DEV_OPT_RPFILTER)
1015                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1016                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1017                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1018                 if (st.flags & DEV_OPT_IGMPVERSION)
1019                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1020                 if (st.flags & DEV_OPT_MLDVERSION)
1021                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1022                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1023                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1024                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1025                 }
1026                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1027                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1028                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1029                 }
1030                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1031                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1032                 if (st.flags & DEV_OPT_DADTRANSMITS)
1033                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1034                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1035                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1036                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1037                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1038                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1039                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1040                 if (st.flags & DEV_OPT_MULTICAST)
1041                         blobmsg_add_u8(b, "multicast", st.multicast);
1042                 if (st.flags & DEV_OPT_LEARNING)
1043                         blobmsg_add_u8(b, "learning", st.learning);
1044                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1045                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1046                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1047                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1048         }
1049
1050         s = blobmsg_open_table(b, "statistics");
1051         if (dev->type->dump_stats)
1052                 dev->type->dump_stats(dev, b);
1053         else
1054                 system_if_dump_stats(dev, b);
1055         blobmsg_close_table(b, s);
1056 }
1057
1058 static void __init simple_device_type_init(void)
1059 {
1060         device_type_add(&simple_device_type);
1061 }