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         free(dev);
 116 }
 117
 118 const struct device_type simple_device_type = {
 119         .name = "Network device",
 120         .config_params = &device_attr_list,
 121
 122         .create = simple_device_create,
 123         .check_state = system_if_check,
 124         .free = simple_device_free,
 125 };
 126
 127 static int
 128 alias_device_set_state(struct device *dev, bool state)
 129 {
 130         struct alias_device *alias;
 131
 132         alias = container_of(dev, struct alias_device, dev);
 133         if (!alias->dep.dev)
 134                 return -1;
 135
 136         if (state)
 137                 return device_claim(&alias->dep);
 138
 139         device_release(&alias->dep);
 140         if (alias->cleanup)
 141                 device_remove_user(&alias->dep);
 142         return 0;
 143 }
 144
 145 static struct device *
 146 alias_device_create(const char *name, struct blob_attr *attr)
 147 {
 148         struct alias_device *alias;
 149
 150         alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
 151         strcpy(alias->name, name);
 152         alias->dev.set_state = alias_device_set_state;
 153         device_init_virtual(&alias->dev, &alias_device_type, NULL);
 154         alias->avl.key = alias->name;
 155         avl_insert(&aliases, &alias->avl);
 156
 157         return &alias->dev;
 158 }
 159
 160 static void alias_device_free(struct device *dev)
 161 {
 162         struct alias_device *alias;
 163
 164         alias = container_of(dev, struct alias_device, dev);
 165         avl_delete(&aliases, &alias->avl);
 166         free(alias);
 167 }
 168
 169 static const struct device_type alias_device_type = {
 170         .name = "Network alias",
 171         .create = alias_device_create,
 172         .free = alias_device_free,
 173 };
 174
 175 static void
 176 device_merge_settings(struct device *dev, struct device_settings *n)
 177 {
 178         struct device_settings *os = &dev->orig_settings;
 179         struct device_settings *s = &dev->settings;
 180
 181         memset(n, 0, sizeof(*n));
 182         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 183         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 184                 s->txqueuelen : os->txqueuelen;
 185         memcpy(n->macaddr,
 186                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 187                 sizeof(n->macaddr));
 188         n->flags = s->flags | os->flags;
 189 }
 190
 191 void
 192 device_init_settings(struct device *dev, struct blob_attr **tb)
 193 {
 194         struct device_settings *s = &dev->settings;
 195         struct blob_attr *cur;
 196         struct ether_addr *ea;
 197         bool disabled = false;
 198
 199         s->flags = 0;
 200         if ((cur = tb[DEV_ATTR_ENABLED]))
 201                 disabled = !blobmsg_get_bool(cur);
 202
 203         if ((cur = tb[DEV_ATTR_MTU])) {
 204                 s->mtu = blobmsg_get_u32(cur);
 205                 s->flags |= DEV_OPT_MTU;
 206         }
 207
 208         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 209                 s->txqueuelen = blobmsg_get_u32(cur);
 210                 s->flags |= DEV_OPT_TXQUEUELEN;
 211         }
 212
 213         if ((cur = tb[DEV_ATTR_MACADDR])) {
 214                 ea = ether_aton(blobmsg_data(cur));
 215                 if (ea) {
 216                         memcpy(s->macaddr, ea, 6);
 217                         s->flags |= DEV_OPT_MACADDR;
 218                 }
 219         }
 220
 221         device_set_disabled(dev, disabled);
 222 }
 223
 224 static void __init dev_init(void)
 225 {
 226         avl_init(&devices, avl_strcmp, true, NULL);
 227         avl_init(&aliases, avl_strcmp, false, NULL);
 228 }
 229
 230 static void device_broadcast_event(struct device *dev, enum device_event ev)
 231 {
 232         struct device_user *dep, *tmp;
 233
 234         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 235                 if (!dep->cb)
 236                         continue;
 237
 238                 dep->cb(dep, ev);
 239         }
 240 }
 241
 242 void
 243 alias_notify_device(const char *name, struct device *dev)
 244 {
 245         struct alias_device *alias;
 246
 247         device_lock();
 248
 249         alias = avl_find_element(&aliases, name, alias, avl);
 250         if (!alias)
 251                 return;
 252
 253         alias->cleanup = !dev;
 254         if (dev) {
 255                 if (dev != alias->dep.dev) {
 256                         device_remove_user(&alias->dep);
 257                         strcpy(alias->dev.ifname, dev->ifname);
 258                         device_add_user(&alias->dep, dev);
 259                 }
 260         }
 261
 262         device_set_present(&alias->dev, !!dev);
 263
 264         if (!dev && alias->dep.dev && !alias->dep.dev->active)
 265                 device_remove_user(&alias->dep);
 266
 267         device_unlock();
 268 }
 269
 270 int device_claim(struct device_user *dep)
 271 {
 272         struct device *dev = dep->dev;
 273         int ret;
 274
 275         if (dep->claimed)
 276                 return 0;
 277
 278         dep->claimed = true;
 279         D(DEVICE, "Claim %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 280         if (++dev->active != 1)
 281                 return 0;
 282
 283         device_broadcast_event(dev, DEV_EVENT_SETUP);
 284         ret = dev->set_state(dev, true);
 285         if (ret == 0)
 286                 device_broadcast_event(dev, DEV_EVENT_UP);
 287         else {
 288                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 289                 dev->active = 0;
 290                 dep->claimed = false;
 291         }
 292
 293         return ret;
 294 }
 295
 296 void device_release(struct device_user *dep)
 297 {
 298         struct device *dev = dep->dev;
 299
 300         if (!dep->claimed)
 301                 return;
 302
 303         dep->claimed = false;
 304         dev->active--;
 305         D(DEVICE, "Release %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active);
 306         assert(dev->active >= 0);
 307
 308         if (dev->active)
 309                 return;
 310
 311         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 312         if (!dep->hotplug)
 313                 dev->set_state(dev, false);
 314         device_broadcast_event(dev, DEV_EVENT_DOWN);
 315 }
 316
 317 int device_check_state(struct device *dev)
 318 {
 319         if (!dev->type->check_state)
 320                 return 0;
 321
 322         return dev->type->check_state(dev);
 323 }
 324
 325 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 326 {
 327         assert(dev);
 328         assert(type);
 329
 330         if (name)
 331                 strncpy(dev->ifname, name, IFNAMSIZ);
 332
 333         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 334         INIT_LIST_HEAD(&dev->users);
 335         dev->type = type;
 336 }
 337
 338 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 339 {
 340         int ret;
 341
 342         device_init_virtual(dev, type, ifname);
 343
 344         if (!dev->set_state)
 345                 dev->set_state = set_device_state;
 346
 347         dev->avl.key = dev->ifname;
 348
 349         ret = avl_insert(&devices, &dev->avl);
 350         if (ret < 0)
 351                 return ret;
 352
 353         system_if_clear_state(dev);
 354         device_check_state(dev);
 355
 356         return 0;
 357 }
 358
 359 static struct device *
 360 device_create_default(const char *name, bool external)
 361 {
 362         struct device *dev;
 363
 364         D(DEVICE, "Create simple device '%s'\n", name);
 365         dev = calloc(1, sizeof(*dev));
 366         dev->external = external;
 367         dev->set_state = simple_device_set_state;
 368         device_init(dev, &simple_device_type, name);
 369         dev->default_config = true;
 370         return dev;
 371 }
 372
 373 static struct device *
 374 device_alias_get(const char *name)
 375 {
 376         struct alias_device *alias;
 377
 378         alias = avl_find_element(&aliases, name, alias, avl);
 379         if (alias)
 380                 return &alias->dev;
 381
 382         return alias_device_create(name, NULL);
 383 }
 384
 385 struct device *
 386 device_get(const char *name, int create)
 387 {
 388         struct device *dev;
 389
 390         if (strchr(name, '.'))
 391                 return get_vlan_device_chain(name, create);
 392
 393         if (name[0] == '@')
 394                 return device_alias_get(name + 1);
 395
 396         dev = avl_find_element(&devices, name, dev, avl);
 397         if (dev)
 398                 return dev;
 399
 400         if (!create)
 401                 return NULL;
 402
 403         return device_create_default(name, create > 1);
 404 }
 405
 406 static void
 407 device_delete(struct device *dev)
 408 {
 409         if (!dev->avl.key)
 410                 return;
 411
 412         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 413         avl_delete(&devices, &dev->avl);
 414         dev->avl.key = NULL;
 415 }
 416
 417 void device_cleanup(struct device *dev)
 418 {
 419         struct device_user *dep, *tmp;
 420
 421         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 422         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 423                 if (!dep->cb)
 424                         continue;
 425
 426                 dep->cb(dep, DEV_EVENT_REMOVE);
 427                 device_release(dep);
 428         }
 429
 430         device_delete(dev);
 431 }
 432
 433 static void __device_set_present(struct device *dev, bool state)
 434 {
 435         if (dev->present == state)
 436                 return;
 437
 438         dev->present = state;
 439         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 440 }
 441
 442 void device_set_present(struct device *dev, bool state)
 443 {
 444         if (dev->sys_present == state)
 445                 return;
 446
 447         dev->sys_present = state;
 448         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 449
 450         if (state && dev->disabled)
 451                 return;
 452
 453         __device_set_present(dev, state);
 454 }
 455
 456 void
 457 device_set_disabled(struct device *dev, bool value)
 458 {
 459         dev->disabled = value;
 460         if (dev->sys_present)
 461                 __device_set_present(dev, !value);
 462 }
 463
 464 void device_add_user(struct device_user *dep, struct device *dev)
 465 {
 466         if (dep->dev)
 467                 device_remove_user(dep);
 468
 469         dep->dev = dev;
 470         list_add_tail(&dep->list, &dev->users);
 471         if (dep->cb && dev->present) {
 472                 dep->cb(dep, DEV_EVENT_ADD);
 473                 if (dev->active)
 474                         dep->cb(dep, DEV_EVENT_UP);
 475         }
 476 }
 477
 478 void
 479 device_free(struct device *dev)
 480 {
 481         __devlock++;
 482         free(dev->config);
 483         device_cleanup(dev);
 484         dev->type->free(dev);
 485         __devlock--;
 486 }
 487
 488 static void
 489 __device_free_unused(struct device *dev)
 490 {
 491         if (!list_empty(&dev->users) || dev->current_config || __devlock)
 492                 return;
 493
 494         device_free(dev);
 495 }
 496
 497 void device_remove_user(struct device_user *dep)
 498 {
 499         struct device *dev = dep->dev;
 500
 501         if (!dep->dev)
 502                 return;
 503
 504         dep->hotplug = false;
 505         if (dep->claimed)
 506                 device_release(dep);
 507
 508         list_del(&dep->list);
 509         dep->dev = NULL;
 510         __device_free_unused(dev);
 511 }
 512
 513 void
 514 device_free_unused(struct device *dev)
 515 {
 516         struct device *tmp;
 517
 518         if (dev)
 519                 return __device_free_unused(dev);
 520
 521         avl_for_each_element_safe(&devices, dev, avl, tmp)
 522                 __device_free_unused(dev);
 523 }
 524
 525 void
 526 device_init_pending(void)
 527 {
 528         struct device *dev, *tmp;
 529
 530         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 531                 if (!dev->config_pending)
 532                         continue;
 533
 534                 dev->type->config_init(dev);
 535                 dev->config_pending = false;
 536         }
 537 }
 538
 539 static enum dev_change_type
 540 device_reload_config(struct device *dev, struct blob_attr *attr)
 541 {
 542         struct blob_attr *tb[__DEV_ATTR_MAX];
 543         const struct config_param_list *cfg = dev->type->config_params;
 544
 545         if (config_check_equal(dev->config, attr, cfg))
 546                 return DEV_CONFIG_NO_CHANGE;
 547
 548         if (cfg == &device_attr_list) {
 549                 memset(tb, 0, sizeof(tb));
 550
 551                 if (attr)
 552                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 553                                 blob_data(attr), blob_len(attr));
 554
 555                 device_init_settings(dev, tb);
 556                 return DEV_CONFIG_RESTART;
 557         } else
 558                 return DEV_CONFIG_RECREATE;
 559 }
 560
 561 enum dev_change_type
 562 device_set_config(struct device *dev, const struct device_type *type,
 563                   struct blob_attr *attr)
 564 {
 565         if (type != dev->type)
 566                 return DEV_CONFIG_RECREATE;
 567
 568         if (dev->type->reload)
 569                 return dev->type->reload(dev, attr);
 570
 571         return device_reload_config(dev, attr);
 572 }
 573
 574 static void
 575 device_replace(struct device *dev, struct device *odev)
 576 {
 577         struct device_user *dep, *tmp;
 578         bool present = odev->present;
 579
 580         if (present)
 581                 device_set_present(odev, false);
 582
 583         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 584                 device_release(dep);
 585                 list_move_tail(&dep->list, &dev->users);
 586                 dep->dev = dev;
 587         }
 588         device_free(odev);
 589
 590         if (present)
 591                 device_set_present(dev, true);
 592 }
 593
 594 void
 595 device_reset_config(void)
 596 {
 597         struct device *dev;
 598
 599         avl_for_each_element(&devices, dev, avl)
 600                 dev->current_config = false;
 601 }
 602
 603 void
 604 device_reset_old(void)
 605 {
 606         struct device *dev, *tmp, *ndev;
 607
 608         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 609                 if (dev->current_config || dev->default_config)
 610                         continue;
 611
 612                 if (dev->type != &simple_device_type)
 613                         continue;
 614
 615                 ndev = device_create_default(dev->ifname, dev->external);
 616                 device_replace(ndev, dev);
 617         }
 618 }
 619
 620 struct device *
 621 device_create(const char *name, const struct device_type *type,
 622               struct blob_attr *config)
 623 {
 624         struct device *odev = NULL, *dev;
 625         enum dev_change_type change;
 626
 627         config = config_memdup(config);
 628         if (!config)
 629                 return NULL;
 630
 631         odev = device_get(name, false);
 632         if (odev) {
 633                 odev->current_config = true;
 634                 change = device_set_config(odev, type, config);
 635                 switch (change) {
 636                 case DEV_CONFIG_RESTART:
 637                 case DEV_CONFIG_APPLIED:
 638                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 639                         free(odev->config);
 640                         odev->config = config;
 641                         if (change == DEV_CONFIG_RESTART && odev->present) {
 642                                 device_set_present(odev, false);
 643                                 device_set_present(odev, true);
 644                         }
 645                         return odev;
 646                 case DEV_CONFIG_NO_CHANGE:
 647                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 648                         free(config);
 649                         return odev;
 650                 case DEV_CONFIG_RECREATE:
 651                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 652                         device_delete(odev);
 653                         break;
 654                 }
 655         } else
 656                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 657
 658         dev = type->create(name, config);
 659         if (!dev)
 660                 return NULL;
 661
 662         dev->current_config = true;
 663         dev->config = config;
 664         if (odev)
 665                 device_replace(dev, odev);
 666
 667         if (!config_init && dev->config_pending)
 668                 type->config_init(dev);
 669
 670         return dev;
 671 }
 672
 673 void
 674 device_dump_status(struct blob_buf *b, struct device *dev)
 675 {
 676         struct device_settings st;
 677         void *c, *s;
 678
 679         if (!dev) {
 680                 avl_for_each_element(&devices, dev, avl) {
 681                         if (!dev->present)
 682                                 continue;
 683                         c = blobmsg_open_table(b, dev->ifname);
 684                         device_dump_status(b, dev);
 685                         blobmsg_close_table(b, c);
 686                 }
 687
 688                 return;
 689         }
 690
 691         if (!dev->present)
 692                 return;
 693
 694         blobmsg_add_string(b, "type", dev->type->name);
 695         blobmsg_add_u8(b, "up", !!dev->active);
 696         if (dev->type->dump_info)
 697                 dev->type->dump_info(dev, b);
 698         else
 699                 system_if_dump_info(dev, b);
 700
 701         if (dev->active) {
 702                 device_merge_settings(dev, &st);
 703                 if (st.flags & DEV_OPT_MTU)
 704                         blobmsg_add_u32(b, "mtu", st.mtu);
 705                 if (st.flags & DEV_OPT_MACADDR)
 706                         blobmsg_add_string(b, "macaddr", ether_ntoa((struct ether_addr *) st.macaddr));
 707                 if (st.flags & DEV_OPT_TXQUEUELEN)
 708                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 709         }
 710
 711         s = blobmsg_open_table(b, "statistics");
 712         if (dev->type->dump_stats)
 713                 dev->type->dump_stats(dev, b);
 714         else
 715                 system_if_dump_stats(dev, b);
 716         blobmsg_close_table(b, s);
 717 }