device.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <assert.h>
   5
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <net/ethernet.h>
   9
  10 #ifdef linux
  11 #include <netinet/ether.h>
  12 #endif
  13
  14 #include "netifd.h"
  15 #include "system.h"
  16 #include "config.h"
  17
  18 static struct avl_tree devices;
  19 static struct avl_tree aliases;
  20
  21 struct alias_device {
  22         struct avl_node avl;
  23         struct device dev;
  24         struct device_user dep;
  25         bool cleanup;
  26         char name[];
  27 };
  28
  29 static const struct device_type alias_device_type;
  30
  31 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  32         [DEV_ATTR_TYPE] = { "type", BLOBMSG_TYPE_STRING },
  33         [DEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  34         [DEV_ATTR_MTU] = { "mtu", BLOBMSG_TYPE_INT32 },
  35         [DEV_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
  36         [DEV_ATTR_TXQUEUELEN] = { "txqueuelen", BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_ENABLED] = { "enabled", BLOBMSG_TYPE_BOOL },
  38 };
  39
  40 const struct config_param_list device_attr_list = {
  41         .n_params = __DEV_ATTR_MAX,
  42         .params = dev_attrs,
  43 };
  44
  45 static int __devlock = 0;
  46
  47 void device_lock(void)
  48 {
  49         __devlock++;
  50 }
  51
  52 void device_unlock(void)
  53 {
  54         __devlock--;
  55         if (!__devlock)
  56                 device_free_unused(NULL);
  57 }
  58
  59 static int set_device_state(struct device *dev, bool state)
  60 {
  61         if (state)
  62                 system_if_up(dev);
  63         else
  64                 system_if_down(dev);
  65
  66         return 0;
  67 }
  68
  69 static int
  70 simple_device_set_state(struct device *dev, bool state)
  71 {
  72         struct device *pdev;
  73         int ret = 0;
  74
  75         pdev = dev->parent.dev;
  76         if (state && !pdev) {
  77                 pdev = system_if_get_parent(dev);
  78                 if (pdev)
  79                         device_add_user(&dev->parent, pdev);
  80         }
  81
  82         if (pdev) {
  83                 if (state)
  84                         ret = device_claim(&dev->parent);
  85                 else
  86                         device_release(&dev->parent);
  87
  88                 if (ret < 0)
  89                         return ret;
  90         }
  91         return set_device_state(dev, state);
  92 }
  93
  94 static struct device *
  95 simple_device_create(const char *name, struct blob_attr *attr)
  96 {
  97         struct blob_attr *tb[__DEV_ATTR_MAX];
  98         struct device *dev = NULL;
  99
 100         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 101         dev = device_get(name, true);
 102         if (!dev)
 103                 return NULL;
 104
 105         dev->set_state = simple_device_set_state;
 106         device_init_settings(dev, tb);
 107
 108         return dev;
 109 }
 110
 111 static void simple_device_free(struct device *dev)
 112 {
 113         if (dev->parent.dev)
 114                 device_remove_user(&dev->parent);
 115         device_cleanup(dev);
 116         free(dev);
 117 }
 118
 119 const struct device_type simple_device_type = {
 120         .name = "Network device",
 121         .config_params = &device_attr_list,
 122
 123         .create = simple_device_create,
 124         .check_state = system_if_check,
 125         .free = simple_device_free,
 126 };
 127
 128 static int
 129 alias_device_set_state(struct device *dev, bool state)
 130 {
 131         struct alias_device *alias;
 132
 133         alias = container_of(dev, struct alias_device, dev);
 134         if (!alias->dep.dev)
 135                 return -1;
 136
 137         if (state)
 138                 return device_claim(&alias->dep);
 139
 140         device_release(&alias->dep);
 141         if (alias->cleanup)
 142                 device_remove_user(&alias->dep);
 143         return 0;
 144 }
 145
 146 static struct device *
 147 alias_device_create(const char *name, struct blob_attr *attr)
 148 {
 149         struct alias_device *alias;
 150
 151         alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
 152         strcpy(alias->name, name);
 153         alias->dev.set_state = alias_device_set_state;
 154         device_init_virtual(&alias->dev, &alias_device_type, NULL);
 155         alias->avl.key = alias->name;
 156         avl_insert(&aliases, &alias->avl);
 157
 158         return &alias->dev;
 159 }
 160
 161 static void alias_device_free(struct device *dev)
 162 {
 163         struct alias_device *alias;
 164
 165         device_cleanup(dev);
 166
 167         alias = container_of(dev, struct alias_device, dev);
 168         avl_delete(&aliases, &alias->avl);
 169         free(alias);
 170 }
 171
 172 static const struct device_type alias_device_type = {
 173         .name = "Network alias",
 174         .create = alias_device_create,
 175         .free = alias_device_free,
 176 };
 177
 178 void
 179 device_init_settings(struct device *dev, struct blob_attr **tb)
 180 {
 181         struct blob_attr *cur;
 182         struct ether_addr *ea;
 183
 184         dev->flags = 0;
 185         dev->disabled = false;
 186
 187         if ((cur = tb[DEV_ATTR_ENABLED]))
 188                 device_set_disabled(dev, !blobmsg_get_bool(cur));
 189
 190         if ((cur = tb[DEV_ATTR_MTU])) {
 191                 dev->mtu = blobmsg_get_u32(cur);
 192                 dev->flags |= DEV_OPT_MTU;
 193         }
 194
 195         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 196                 dev->txqueuelen = blobmsg_get_u32(cur);
 197                 dev->flags |= DEV_OPT_TXQUEUELEN;
 198         }
 199
 200         if ((cur = tb[DEV_ATTR_MACADDR])) {
 201                 ea = ether_aton(blob_data(cur));
 202                 if (ea) {
 203                         memcpy(dev->macaddr, ea, sizeof(dev->macaddr));
 204                         dev->flags |= DEV_OPT_MACADDR;
 205                 }
 206         }
 207 }
 208
 209 static void __init dev_init(void)
 210 {
 211         avl_init(&devices, avl_strcmp, true, NULL);
 212         avl_init(&aliases, avl_strcmp, false, NULL);
 213 }
 214
 215 static void device_broadcast_event(struct device *dev, enum device_event ev)
 216 {
 217         struct device_user *dep, *tmp;
 218
 219         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 220                 if (!dep->cb)
 221                         continue;
 222
 223                 dep->cb(dep, ev);
 224         }
 225 }
 226
 227 void
 228 alias_notify_device(const char *name, struct device *dev)
 229 {
 230         struct alias_device *alias;
 231
 232         device_lock();
 233
 234         alias = avl_find_element(&aliases, name, alias, avl);
 235         if (!alias)
 236                 return;
 237
 238         alias->cleanup = !dev;
 239         if (dev) {
 240                 if (dev != alias->dep.dev) {
 241                         device_remove_user(&alias->dep);
 242                         strcpy(alias->dev.ifname, dev->ifname);
 243                         device_add_user(&alias->dep, dev);
 244                 }
 245         }
 246
 247         device_set_present(&alias->dev, !!dev);
 248
 249         if (!dev && alias->dep.dev && !alias->dep.dev->active)
 250                 device_remove_user(&alias->dep);
 251
 252         device_unlock();
 253 }
 254
 255 int device_claim(struct device_user *dep)
 256 {
 257         struct device *dev = dep->dev;
 258         int ret;
 259
 260         if (dep->claimed)
 261                 return 0;
 262
 263         dep->claimed = true;
 264         D(DEVICE, "Claim %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 265         if (++dev->active != 1)
 266                 return 0;
 267
 268         device_broadcast_event(dev, DEV_EVENT_SETUP);
 269         ret = dev->set_state(dev, true);
 270         if (ret == 0)
 271                 device_broadcast_event(dev, DEV_EVENT_UP);
 272         else {
 273                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 274                 dev->active = 0;
 275                 dep->claimed = false;
 276         }
 277
 278         return ret;
 279 }
 280
 281 void device_release(struct device_user *dep)
 282 {
 283         struct device *dev = dep->dev;
 284
 285         if (!dep->claimed)
 286                 return;
 287
 288         dep->claimed = false;
 289         dev->active--;
 290         D(DEVICE, "Release %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active);
 291         assert(dev->active >= 0);
 292
 293         if (dev->active)
 294                 return;
 295
 296         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 297         dev->set_state(dev, false);
 298         device_broadcast_event(dev, DEV_EVENT_DOWN);
 299 }
 300
 301 int device_check_state(struct device *dev)
 302 {
 303         if (!dev->type->check_state)
 304                 return 0;
 305
 306         return dev->type->check_state(dev);
 307 }
 308
 309 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 310 {
 311         assert(dev);
 312         assert(type);
 313
 314         if (name)
 315                 strncpy(dev->ifname, name, IFNAMSIZ);
 316
 317         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 318         INIT_LIST_HEAD(&dev->users);
 319         dev->type = type;
 320 }
 321
 322 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 323 {
 324         int ret;
 325
 326         device_init_virtual(dev, type, ifname);
 327
 328         if (!dev->set_state)
 329                 dev->set_state = set_device_state;
 330
 331         dev->avl.key = dev->ifname;
 332
 333         ret = avl_insert(&devices, &dev->avl);
 334         if (ret < 0)
 335                 return ret;
 336
 337         system_if_clear_state(dev);
 338         device_check_state(dev);
 339
 340         return 0;
 341 }
 342
 343 static struct device *
 344 device_create_default(const char *name, bool external)
 345 {
 346         struct device *dev;
 347
 348         D(DEVICE, "Create simple device '%s'\n", name);
 349         dev = calloc(1, sizeof(*dev));
 350         dev->external = external;
 351         dev->set_state = simple_device_set_state;
 352         device_init(dev, &simple_device_type, name);
 353         dev->default_config = true;
 354         return dev;
 355 }
 356
 357 static struct device *
 358 device_alias_get(const char *name)
 359 {
 360         struct alias_device *alias;
 361
 362         alias = avl_find_element(&aliases, name, alias, avl);
 363         if (alias)
 364                 return &alias->dev;
 365
 366         return alias_device_create(name, NULL);
 367 }
 368
 369 struct device *
 370 device_get(const char *name, int create)
 371 {
 372         struct device *dev;
 373
 374         if (strchr(name, '.'))
 375                 return get_vlan_device_chain(name, create);
 376
 377         if (name[0] == '@')
 378                 return device_alias_get(name + 1);
 379
 380         dev = avl_find_element(&devices, name, dev, avl);
 381         if (dev)
 382                 return dev;
 383
 384         if (!create)
 385                 return NULL;
 386
 387         return device_create_default(name, create > 1);
 388 }
 389
 390 static void
 391 device_delete(struct device *dev)
 392 {
 393         if (!dev->avl.key)
 394                 return;
 395
 396         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 397         avl_delete(&devices, &dev->avl);
 398         dev->avl.key = NULL;
 399 }
 400
 401 void device_cleanup(struct device *dev)
 402 {
 403         struct device_user *dep, *tmp;
 404
 405         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 406         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 407                 if (!dep->cb)
 408                         continue;
 409
 410                 dep->cb(dep, DEV_EVENT_REMOVE);
 411                 device_release(dep);
 412         }
 413
 414         device_delete(dev);
 415 }
 416
 417 static void __device_set_present(struct device *dev, bool state)
 418 {
 419         if (dev->present == state)
 420                 return;
 421
 422         dev->present = state;
 423         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 424 }
 425
 426 void device_set_present(struct device *dev, bool state)
 427 {
 428         if (dev->sys_present == state)
 429                 return;
 430
 431         dev->sys_present = state;
 432         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 433
 434         if (state && dev->disabled)
 435                 return;
 436
 437         __device_set_present(dev, state);
 438 }
 439
 440 void
 441 device_set_disabled(struct device *dev, bool value)
 442 {
 443         dev->disabled = value;
 444         if (dev->sys_present)
 445                 __device_set_present(dev, !value);
 446 }
 447
 448 void device_add_user(struct device_user *dep, struct device *dev)
 449 {
 450         dep->dev = dev;
 451         list_add_tail(&dep->list, &dev->users);
 452         if (dep->cb && dev->present) {
 453                 dep->cb(dep, DEV_EVENT_ADD);
 454                 if (dev->active)
 455                         dep->cb(dep, DEV_EVENT_UP);
 456         }
 457 }
 458
 459 void
 460 device_free(struct device *dev)
 461 {
 462         __devlock++;
 463         dev->type->free(dev);
 464         __devlock--;
 465 }
 466
 467 static void
 468 __device_free_unused(struct device *dev)
 469 {
 470         if (!list_empty(&dev->users) || dev->current_config || __devlock)
 471                 return;
 472
 473         device_free(dev);
 474 }
 475
 476 void device_remove_user(struct device_user *dep)
 477 {
 478         struct device *dev = dep->dev;
 479
 480         if (!dep->dev)
 481                 return;
 482
 483         dep->hotplug = false;
 484         if (dep->claimed)
 485                 device_release(dep);
 486
 487         list_del(&dep->list);
 488         dep->dev = NULL;
 489         __device_free_unused(dev);
 490 }
 491
 492 void
 493 device_free_unused(struct device *dev)
 494 {
 495         struct device *tmp;
 496
 497         if (dev)
 498                 return __device_free_unused(dev);
 499
 500         avl_for_each_element_safe(&devices, dev, avl, tmp)
 501                 __device_free_unused(dev);
 502 }
 503
 504 void
 505 device_init_pending(void)
 506 {
 507         struct device *dev, *tmp;
 508
 509         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 510                 if (!dev->config_pending)
 511                         continue;
 512
 513                 dev->type->config_init(dev);
 514                 dev->config_pending = false;
 515         }
 516 }
 517
 518 static enum dev_change_type
 519 device_reload_config(struct device *dev, struct blob_attr *attr)
 520 {
 521         struct blob_attr *tb[__DEV_ATTR_MAX];
 522         const struct config_param_list *cfg = dev->type->config_params;
 523
 524         if (config_check_equal(dev->config, attr, cfg))
 525                 return DEV_CONFIG_NO_CHANGE;
 526
 527         if (cfg == &device_attr_list) {
 528                 memset(tb, 0, sizeof(tb));
 529
 530                 if (attr)
 531                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 532                                 blob_data(attr), blob_len(attr));
 533
 534                 device_init_settings(dev, tb);
 535                 return DEV_CONFIG_APPLIED;
 536         } else
 537                 return DEV_CONFIG_RECREATE;
 538 }
 539
 540 enum dev_change_type
 541 device_set_config(struct device *dev, const struct device_type *type,
 542                   struct blob_attr *attr)
 543 {
 544         if (type != dev->type)
 545                 return DEV_CONFIG_RECREATE;
 546
 547         if (dev->type->reload)
 548                 return dev->type->reload(dev, attr);
 549
 550         return device_reload_config(dev, attr);
 551 }
 552
 553 static void
 554 device_replace(struct device *dev, struct device *odev)
 555 {
 556         struct device_user *dep, *tmp;
 557         bool present = odev->present;
 558
 559         if (present)
 560                 device_set_present(odev, false);
 561
 562         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 563                 device_release(dep);
 564                 list_move_tail(&dep->list, &dev->users);
 565                 dep->dev = dev;
 566         }
 567         device_free(odev);
 568
 569         if (present)
 570                 device_set_present(dev, true);
 571 }
 572
 573 void
 574 device_reset_config(void)
 575 {
 576         struct device *dev;
 577
 578         avl_for_each_element(&devices, dev, avl)
 579                 dev->current_config = false;
 580 }
 581
 582 void
 583 device_reset_old(void)
 584 {
 585         struct device *dev, *tmp, *ndev;
 586
 587         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 588                 if (dev->current_config || dev->default_config)
 589                         continue;
 590
 591                 if (dev->type != &simple_device_type)
 592                         continue;
 593
 594                 ndev = device_create_default(dev->ifname, dev->external);
 595                 device_replace(ndev, dev);
 596         }
 597 }
 598
 599 struct device *
 600 device_create(const char *name, const struct device_type *type,
 601               struct blob_attr *config)
 602 {
 603         struct device *odev = NULL, *dev;
 604         enum dev_change_type change;
 605
 606         config = config_memdup(config);
 607         if (!config)
 608                 return NULL;
 609
 610         odev = device_get(name, false);
 611         if (odev) {
 612                 odev->current_config = true;
 613                 change = device_set_config(odev, type, config);
 614                 switch (change) {
 615                 case DEV_CONFIG_APPLIED:
 616                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 617                         free(odev->config);
 618                         odev->config = config;
 619                         if (odev->present) {
 620                                 device_set_present(odev, false);
 621                                 device_set_present(odev, true);
 622                         }
 623                         return odev;
 624                 case DEV_CONFIG_NO_CHANGE:
 625                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 626                         free(config);
 627                         return odev;
 628                 case DEV_CONFIG_RECREATE:
 629                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 630                         device_delete(odev);
 631                         break;
 632                 }
 633         } else
 634                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 635
 636         dev = type->create(name, config);
 637         if (!dev)
 638                 return NULL;
 639
 640         dev->current_config = true;
 641         dev->config = config;
 642         if (odev)
 643                 device_replace(dev, odev);
 644
 645         if (!config_init && dev->config_pending)
 646                 type->config_init(dev);
 647
 648         return dev;
 649 }
 650
 651 void
 652 device_dump_status(struct blob_buf *b, struct device *dev)
 653 {
 654         void *c, *s;
 655
 656         if (!dev) {
 657                 avl_for_each_element(&devices, dev, avl) {
 658                         if (!dev->present)
 659                                 continue;
 660                         c = blobmsg_open_table(b, dev->ifname);
 661                         device_dump_status(b, dev);
 662                         blobmsg_close_table(b, c);
 663                 }
 664
 665                 return;
 666         }
 667
 668         if (!dev->present)
 669                 return;
 670
 671         blobmsg_add_string(b, "type", dev->type->name);
 672         blobmsg_add_u8(b, "up", !!dev->active);
 673         if (dev->type->dump_info)
 674                 dev->type->dump_info(dev, b);
 675         else
 676                 system_if_dump_info(dev, b);
 677
 678         s = blobmsg_open_table(b, "statistics");
 679         if (dev->type->dump_stats)
 680                 dev->type->dump_stats(dev, b);
 681         else
 682                 system_if_dump_stats(dev, b);
 683         blobmsg_close_table(b, s);
 684 }