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 device_settings *s = &dev->settings;
 182         struct blob_attr *cur;
 183         struct ether_addr *ea;
 184
 185         s->flags = 0;
 186         dev->disabled = false;
 187
 188         if ((cur = tb[DEV_ATTR_ENABLED]))
 189                 device_set_disabled(dev, !blobmsg_get_bool(cur));
 190
 191         if ((cur = tb[DEV_ATTR_MTU])) {
 192                 s->mtu = blobmsg_get_u32(cur);
 193                 s->flags |= DEV_OPT_MTU;
 194         }
 195
 196         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 197                 s->txqueuelen = blobmsg_get_u32(cur);
 198                 s->flags |= DEV_OPT_TXQUEUELEN;
 199         }
 200
 201         if ((cur = tb[DEV_ATTR_MACADDR])) {
 202                 ea = ether_aton(blob_data(cur));
 203                 if (ea) {
 204                         memcpy(s->macaddr, ea, 6);
 205                         s->flags |= DEV_OPT_MACADDR;
 206                 }
 207         }
 208 }
 209
 210 static void __init dev_init(void)
 211 {
 212         avl_init(&devices, avl_strcmp, true, NULL);
 213         avl_init(&aliases, avl_strcmp, false, NULL);
 214 }
 215
 216 static void device_broadcast_event(struct device *dev, enum device_event ev)
 217 {
 218         struct device_user *dep, *tmp;
 219
 220         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 221                 if (!dep->cb)
 222                         continue;
 223
 224                 dep->cb(dep, ev);
 225         }
 226 }
 227
 228 void
 229 alias_notify_device(const char *name, struct device *dev)
 230 {
 231         struct alias_device *alias;
 232
 233         device_lock();
 234
 235         alias = avl_find_element(&aliases, name, alias, avl);
 236         if (!alias)
 237                 return;
 238
 239         alias->cleanup = !dev;
 240         if (dev) {
 241                 if (dev != alias->dep.dev) {
 242                         device_remove_user(&alias->dep);
 243                         strcpy(alias->dev.ifname, dev->ifname);
 244                         device_add_user(&alias->dep, dev);
 245                 }
 246         }
 247
 248         device_set_present(&alias->dev, !!dev);
 249
 250         if (!dev && alias->dep.dev && !alias->dep.dev->active)
 251                 device_remove_user(&alias->dep);
 252
 253         device_unlock();
 254 }
 255
 256 int device_claim(struct device_user *dep)
 257 {
 258         struct device *dev = dep->dev;
 259         int ret;
 260
 261         if (dep->claimed)
 262                 return 0;
 263
 264         dep->claimed = true;
 265         D(DEVICE, "Claim %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 266         if (++dev->active != 1)
 267                 return 0;
 268
 269         device_broadcast_event(dev, DEV_EVENT_SETUP);
 270         ret = dev->set_state(dev, true);
 271         if (ret == 0)
 272                 device_broadcast_event(dev, DEV_EVENT_UP);
 273         else {
 274                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 275                 dev->active = 0;
 276                 dep->claimed = false;
 277         }
 278
 279         return ret;
 280 }
 281
 282 void device_release(struct device_user *dep)
 283 {
 284         struct device *dev = dep->dev;
 285
 286         if (!dep->claimed)
 287                 return;
 288
 289         dep->claimed = false;
 290         dev->active--;
 291         D(DEVICE, "Release %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active);
 292         assert(dev->active >= 0);
 293
 294         if (dev->active)
 295                 return;
 296
 297         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 298         dev->set_state(dev, false);
 299         device_broadcast_event(dev, DEV_EVENT_DOWN);
 300 }
 301
 302 int device_check_state(struct device *dev)
 303 {
 304         if (!dev->type->check_state)
 305                 return 0;
 306
 307         return dev->type->check_state(dev);
 308 }
 309
 310 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 311 {
 312         assert(dev);
 313         assert(type);
 314
 315         if (name)
 316                 strncpy(dev->ifname, name, IFNAMSIZ);
 317
 318         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 319         INIT_LIST_HEAD(&dev->users);
 320         dev->type = type;
 321 }
 322
 323 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 324 {
 325         int ret;
 326
 327         device_init_virtual(dev, type, ifname);
 328
 329         if (!dev->set_state)
 330                 dev->set_state = set_device_state;
 331
 332         dev->avl.key = dev->ifname;
 333
 334         ret = avl_insert(&devices, &dev->avl);
 335         if (ret < 0)
 336                 return ret;
 337
 338         system_if_clear_state(dev);
 339         device_check_state(dev);
 340
 341         return 0;
 342 }
 343
 344 static struct device *
 345 device_create_default(const char *name, bool external)
 346 {
 347         struct device *dev;
 348
 349         D(DEVICE, "Create simple device '%s'\n", name);
 350         dev = calloc(1, sizeof(*dev));
 351         dev->external = external;
 352         dev->set_state = simple_device_set_state;
 353         device_init(dev, &simple_device_type, name);
 354         dev->default_config = true;
 355         return dev;
 356 }
 357
 358 static struct device *
 359 device_alias_get(const char *name)
 360 {
 361         struct alias_device *alias;
 362
 363         alias = avl_find_element(&aliases, name, alias, avl);
 364         if (alias)
 365                 return &alias->dev;
 366
 367         return alias_device_create(name, NULL);
 368 }
 369
 370 struct device *
 371 device_get(const char *name, int create)
 372 {
 373         struct device *dev;
 374
 375         if (strchr(name, '.'))
 376                 return get_vlan_device_chain(name, create);
 377
 378         if (name[0] == '@')
 379                 return device_alias_get(name + 1);
 380
 381         dev = avl_find_element(&devices, name, dev, avl);
 382         if (dev)
 383                 return dev;
 384
 385         if (!create)
 386                 return NULL;
 387
 388         return device_create_default(name, create > 1);
 389 }
 390
 391 static void
 392 device_delete(struct device *dev)
 393 {
 394         if (!dev->avl.key)
 395                 return;
 396
 397         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 398         avl_delete(&devices, &dev->avl);
 399         dev->avl.key = NULL;
 400 }
 401
 402 void device_cleanup(struct device *dev)
 403 {
 404         struct device_user *dep, *tmp;
 405
 406         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 407         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 408                 if (!dep->cb)
 409                         continue;
 410
 411                 dep->cb(dep, DEV_EVENT_REMOVE);
 412                 device_release(dep);
 413         }
 414
 415         device_delete(dev);
 416 }
 417
 418 static void __device_set_present(struct device *dev, bool state)
 419 {
 420         if (dev->present == state)
 421                 return;
 422
 423         dev->present = state;
 424         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 425 }
 426
 427 void device_set_present(struct device *dev, bool state)
 428 {
 429         if (dev->sys_present == state)
 430                 return;
 431
 432         dev->sys_present = state;
 433         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 434
 435         if (state && dev->disabled)
 436                 return;
 437
 438         __device_set_present(dev, state);
 439 }
 440
 441 void
 442 device_set_disabled(struct device *dev, bool value)
 443 {
 444         dev->disabled = value;
 445         if (dev->sys_present)
 446                 __device_set_present(dev, !value);
 447 }
 448
 449 void device_add_user(struct device_user *dep, struct device *dev)
 450 {
 451         dep->dev = dev;
 452         list_add_tail(&dep->list, &dev->users);
 453         if (dep->cb && dev->present) {
 454                 dep->cb(dep, DEV_EVENT_ADD);
 455                 if (dev->active)
 456                         dep->cb(dep, DEV_EVENT_UP);
 457         }
 458 }
 459
 460 void
 461 device_free(struct device *dev)
 462 {
 463         __devlock++;
 464         dev->type->free(dev);
 465         __devlock--;
 466 }
 467
 468 static void
 469 __device_free_unused(struct device *dev)
 470 {
 471         if (!list_empty(&dev->users) || dev->current_config || __devlock)
 472                 return;
 473
 474         device_free(dev);
 475 }
 476
 477 void device_remove_user(struct device_user *dep)
 478 {
 479         struct device *dev = dep->dev;
 480
 481         if (!dep->dev)
 482                 return;
 483
 484         dep->hotplug = false;
 485         if (dep->claimed)
 486                 device_release(dep);
 487
 488         list_del(&dep->list);
 489         dep->dev = NULL;
 490         __device_free_unused(dev);
 491 }
 492
 493 void
 494 device_free_unused(struct device *dev)
 495 {
 496         struct device *tmp;
 497
 498         if (dev)
 499                 return __device_free_unused(dev);
 500
 501         avl_for_each_element_safe(&devices, dev, avl, tmp)
 502                 __device_free_unused(dev);
 503 }
 504
 505 void
 506 device_init_pending(void)
 507 {
 508         struct device *dev, *tmp;
 509
 510         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 511                 if (!dev->config_pending)
 512                         continue;
 513
 514                 dev->type->config_init(dev);
 515                 dev->config_pending = false;
 516         }
 517 }
 518
 519 static enum dev_change_type
 520 device_reload_config(struct device *dev, struct blob_attr *attr)
 521 {
 522         struct blob_attr *tb[__DEV_ATTR_MAX];
 523         const struct config_param_list *cfg = dev->type->config_params;
 524
 525         if (config_check_equal(dev->config, attr, cfg))
 526                 return DEV_CONFIG_NO_CHANGE;
 527
 528         if (cfg == &device_attr_list) {
 529                 memset(tb, 0, sizeof(tb));
 530
 531                 if (attr)
 532                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 533                                 blob_data(attr), blob_len(attr));
 534
 535                 device_init_settings(dev, tb);
 536                 return DEV_CONFIG_APPLIED;
 537         } else
 538                 return DEV_CONFIG_RECREATE;
 539 }
 540
 541 enum dev_change_type
 542 device_set_config(struct device *dev, const struct device_type *type,
 543                   struct blob_attr *attr)
 544 {
 545         if (type != dev->type)
 546                 return DEV_CONFIG_RECREATE;
 547
 548         if (dev->type->reload)
 549                 return dev->type->reload(dev, attr);
 550
 551         return device_reload_config(dev, attr);
 552 }
 553
 554 static void
 555 device_replace(struct device *dev, struct device *odev)
 556 {
 557         struct device_user *dep, *tmp;
 558         bool present = odev->present;
 559
 560         if (present)
 561                 device_set_present(odev, false);
 562
 563         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 564                 device_release(dep);
 565                 list_move_tail(&dep->list, &dev->users);
 566                 dep->dev = dev;
 567         }
 568         device_free(odev);
 569
 570         if (present)
 571                 device_set_present(dev, true);
 572 }
 573
 574 void
 575 device_reset_config(void)
 576 {
 577         struct device *dev;
 578
 579         avl_for_each_element(&devices, dev, avl)
 580                 dev->current_config = false;
 581 }
 582
 583 void
 584 device_reset_old(void)
 585 {
 586         struct device *dev, *tmp, *ndev;
 587
 588         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 589                 if (dev->current_config || dev->default_config)
 590                         continue;
 591
 592                 if (dev->type != &simple_device_type)
 593                         continue;
 594
 595                 ndev = device_create_default(dev->ifname, dev->external);
 596                 device_replace(ndev, dev);
 597         }
 598 }
 599
 600 struct device *
 601 device_create(const char *name, const struct device_type *type,
 602               struct blob_attr *config)
 603 {
 604         struct device *odev = NULL, *dev;
 605         enum dev_change_type change;
 606
 607         config = config_memdup(config);
 608         if (!config)
 609                 return NULL;
 610
 611         odev = device_get(name, false);
 612         if (odev) {
 613                 odev->current_config = true;
 614                 change = device_set_config(odev, type, config);
 615                 switch (change) {
 616                 case DEV_CONFIG_APPLIED:
 617                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 618                         free(odev->config);
 619                         odev->config = config;
 620                         if (odev->present) {
 621                                 device_set_present(odev, false);
 622                                 device_set_present(odev, true);
 623                         }
 624                         return odev;
 625                 case DEV_CONFIG_NO_CHANGE:
 626                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 627                         free(config);
 628                         return odev;
 629                 case DEV_CONFIG_RECREATE:
 630                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 631                         device_delete(odev);
 632                         break;
 633                 }
 634         } else
 635                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 636
 637         dev = type->create(name, config);
 638         if (!dev)
 639                 return NULL;
 640
 641         dev->current_config = true;
 642         dev->config = config;
 643         if (odev)
 644                 device_replace(dev, odev);
 645
 646         if (!config_init && dev->config_pending)
 647                 type->config_init(dev);
 648
 649         return dev;
 650 }
 651
 652 void
 653 device_dump_status(struct blob_buf *b, struct device *dev)
 654 {
 655         void *c, *s;
 656
 657         if (!dev) {
 658                 avl_for_each_element(&devices, dev, avl) {
 659                         if (!dev->present)
 660                                 continue;
 661                         c = blobmsg_open_table(b, dev->ifname);
 662                         device_dump_status(b, dev);
 663                         blobmsg_close_table(b, c);
 664                 }
 665
 666                 return;
 667         }
 668
 669         if (!dev->present)
 670                 return;
 671
 672         blobmsg_add_string(b, "type", dev->type->name);
 673         blobmsg_add_u8(b, "up", !!dev->active);
 674         if (dev->type->dump_info)
 675                 dev->type->dump_info(dev, b);
 676         else
 677                 system_if_dump_info(dev, b);
 678
 679         s = blobmsg_open_table(b, "statistics");
 680         if (dev->type->dump_stats)
 681                 dev->type->dump_stats(dev, b);
 682         else
 683                 system_if_dump_stats(dev, b);
 684         blobmsg_close_table(b, s);
 685 }