device.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <assert.h>
  18
  19 #include <sys/types.h>
  20 #include <sys/socket.h>
  21 #include <net/ethernet.h>
  22
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26
  27 #include "netifd.h"
  28 #include "system.h"
  29 #include "config.h"
  30
  31 static struct avl_tree devices;
  32
  33 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  34         [DEV_ATTR_TYPE] = { "type", BLOBMSG_TYPE_STRING },
  35         [DEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  36         [DEV_ATTR_MTU] = { "mtu", BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
  38         [DEV_ATTR_TXQUEUELEN] = { "txqueuelen", BLOBMSG_TYPE_INT32 },
  39         [DEV_ATTR_ENABLED] = { "enabled", BLOBMSG_TYPE_BOOL },
  40 };
  41
  42 const struct config_param_list device_attr_list = {
  43         .n_params = __DEV_ATTR_MAX,
  44         .params = dev_attrs,
  45 };
  46
  47 static int __devlock = 0;
  48
  49 void device_lock(void)
  50 {
  51         __devlock++;
  52 }
  53
  54 void device_unlock(void)
  55 {
  56         __devlock--;
  57         if (!__devlock)
  58                 device_free_unused(NULL);
  59 }
  60
  61 static int set_device_state(struct device *dev, bool state)
  62 {
  63         if (state)
  64                 system_if_up(dev);
  65         else
  66                 system_if_down(dev);
  67
  68         return 0;
  69 }
  70
  71 static int
  72 simple_device_set_state(struct device *dev, bool state)
  73 {
  74         struct device *pdev;
  75         int ret = 0;
  76
  77         pdev = dev->parent.dev;
  78         if (state && !pdev) {
  79                 pdev = system_if_get_parent(dev);
  80                 if (pdev)
  81                         device_add_user(&dev->parent, pdev);
  82         }
  83
  84         if (pdev) {
  85                 if (state)
  86                         ret = device_claim(&dev->parent);
  87                 else
  88                         device_release(&dev->parent);
  89
  90                 if (ret < 0)
  91                         return ret;
  92         }
  93         return set_device_state(dev, state);
  94 }
  95
  96 static struct device *
  97 simple_device_create(const char *name, struct blob_attr *attr)
  98 {
  99         struct blob_attr *tb[__DEV_ATTR_MAX];
 100         struct device *dev = NULL;
 101
 102         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 103         dev = device_get(name, true);
 104         if (!dev)
 105                 return NULL;
 106
 107         dev->set_state = simple_device_set_state;
 108         device_init_settings(dev, tb);
 109
 110         return dev;
 111 }
 112
 113 static void simple_device_free(struct device *dev)
 114 {
 115         if (dev->parent.dev)
 116                 device_remove_user(&dev->parent);
 117         free(dev);
 118 }
 119
 120 const struct device_type simple_device_type = {
 121         .name = "Network device",
 122         .config_params = &device_attr_list,
 123
 124         .create = simple_device_create,
 125         .check_state = system_if_check,
 126         .free = simple_device_free,
 127 };
 128
 129 static void
 130 device_merge_settings(struct device *dev, struct device_settings *n)
 131 {
 132         struct device_settings *os = &dev->orig_settings;
 133         struct device_settings *s = &dev->settings;
 134
 135         memset(n, 0, sizeof(*n));
 136         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 137         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 138                 s->txqueuelen : os->txqueuelen;
 139         memcpy(n->macaddr,
 140                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 141                 sizeof(n->macaddr));
 142         n->flags = s->flags | os->flags;
 143 }
 144
 145 void
 146 device_init_settings(struct device *dev, struct blob_attr **tb)
 147 {
 148         struct device_settings *s = &dev->settings;
 149         struct blob_attr *cur;
 150         struct ether_addr *ea;
 151         bool disabled = false;
 152
 153         s->flags = 0;
 154         if ((cur = tb[DEV_ATTR_ENABLED]))
 155                 disabled = !blobmsg_get_bool(cur);
 156
 157         if ((cur = tb[DEV_ATTR_MTU])) {
 158                 s->mtu = blobmsg_get_u32(cur);
 159                 s->flags |= DEV_OPT_MTU;
 160         }
 161
 162         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 163                 s->txqueuelen = blobmsg_get_u32(cur);
 164                 s->flags |= DEV_OPT_TXQUEUELEN;
 165         }
 166
 167         if ((cur = tb[DEV_ATTR_MACADDR])) {
 168                 ea = ether_aton(blobmsg_data(cur));
 169                 if (ea) {
 170                         memcpy(s->macaddr, ea, 6);
 171                         s->flags |= DEV_OPT_MACADDR;
 172                 }
 173         }
 174
 175         device_set_disabled(dev, disabled);
 176 }
 177
 178 static void __init dev_init(void)
 179 {
 180         avl_init(&devices, avl_strcmp, true, NULL);
 181 }
 182
 183 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 184 {
 185         struct device_user *dep = container_of(list, struct device_user, list);
 186         int *ev = ctx;
 187
 188         if (dep->cb)
 189                 dep->cb(dep, *ev);
 190         return 0;
 191 }
 192
 193 void device_broadcast_event(struct device *dev, enum device_event ev)
 194 {
 195         int dev_ev = ev;
 196
 197         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 198         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 199 }
 200
 201 int device_claim(struct device_user *dep)
 202 {
 203         struct device *dev = dep->dev;
 204         int ret;
 205
 206         if (dep->claimed)
 207                 return 0;
 208
 209         dep->claimed = true;
 210         D(DEVICE, "Claim %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 211         if (++dev->active != 1)
 212                 return 0;
 213
 214         device_broadcast_event(dev, DEV_EVENT_SETUP);
 215         ret = dev->set_state(dev, true);
 216         if (ret == 0)
 217                 device_broadcast_event(dev, DEV_EVENT_UP);
 218         else {
 219                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 220                 dev->active = 0;
 221                 dep->claimed = false;
 222         }
 223
 224         return ret;
 225 }
 226
 227 void device_release(struct device_user *dep)
 228 {
 229         struct device *dev = dep->dev;
 230
 231         if (!dep->claimed)
 232                 return;
 233
 234         dep->claimed = false;
 235         dev->active--;
 236         D(DEVICE, "Release %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active);
 237         assert(dev->active >= 0);
 238
 239         if (dev->active)
 240                 return;
 241
 242         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 243         if (!dep->hotplug)
 244                 dev->set_state(dev, false);
 245         device_broadcast_event(dev, DEV_EVENT_DOWN);
 246 }
 247
 248 int device_check_state(struct device *dev)
 249 {
 250         if (!dev->type->check_state)
 251                 return 0;
 252
 253         return dev->type->check_state(dev);
 254 }
 255
 256 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 257 {
 258         assert(dev);
 259         assert(type);
 260
 261         if (name)
 262                 strncpy(dev->ifname, name, IFNAMSIZ);
 263
 264         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 265         INIT_SAFE_LIST(&dev->users);
 266         INIT_SAFE_LIST(&dev->aliases);
 267         dev->type = type;
 268
 269         if (!dev->set_state)
 270                 dev->set_state = set_device_state;
 271 }
 272
 273 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 274 {
 275         int ret;
 276
 277         device_init_virtual(dev, type, ifname);
 278
 279         dev->avl.key = dev->ifname;
 280
 281         ret = avl_insert(&devices, &dev->avl);
 282         if (ret < 0)
 283                 return ret;
 284
 285         system_if_clear_state(dev);
 286         device_check_state(dev);
 287
 288         return 0;
 289 }
 290
 291 static struct device *
 292 device_create_default(const char *name, bool external)
 293 {
 294         struct device *dev;
 295
 296         if (!external && system_if_force_external(name))
 297                 return NULL;
 298
 299         D(DEVICE, "Create simple device '%s'\n", name);
 300         dev = calloc(1, sizeof(*dev));
 301         dev->external = external;
 302         dev->set_state = simple_device_set_state;
 303         device_init(dev, &simple_device_type, name);
 304         dev->default_config = true;
 305         return dev;
 306 }
 307
 308 struct device *
 309 device_get(const char *name, int create)
 310 {
 311         struct device *dev;
 312
 313         if (strchr(name, '.'))
 314                 return get_vlan_device_chain(name, create);
 315
 316         if (name[0] == '@')
 317                 return device_alias_get(name + 1);
 318
 319         dev = avl_find_element(&devices, name, dev, avl);
 320         if (dev) {
 321                 if (create > 1 && !dev->external) {
 322                         dev->external = true;
 323                         device_set_present(dev, true);
 324                 }
 325                 return dev;
 326         }
 327
 328         if (!create)
 329                 return NULL;
 330
 331         return device_create_default(name, create > 1);
 332 }
 333
 334 static void
 335 device_delete(struct device *dev)
 336 {
 337         if (!dev->avl.key)
 338                 return;
 339
 340         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 341         avl_delete(&devices, &dev->avl);
 342         dev->avl.key = NULL;
 343 }
 344
 345 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 346 {
 347         struct device_user *dep = container_of(list, struct device_user, list);
 348         if (dep->cb)
 349                 dep->cb(dep, DEV_EVENT_REMOVE);
 350
 351         device_release(dep);
 352         return 0;
 353 }
 354
 355 void device_cleanup(struct device *dev)
 356 {
 357         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 358         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 359         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 360         device_delete(dev);
 361 }
 362
 363 static void __device_set_present(struct device *dev, bool state)
 364 {
 365         if (dev->present == state)
 366                 return;
 367
 368         dev->present = state;
 369         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 370 }
 371
 372 void
 373 device_refresh_present(struct device *dev)
 374 {
 375         bool state = dev->sys_present;
 376
 377         if (dev->disabled || dev->deferred)
 378                 state = false;
 379
 380         __device_set_present(dev, state);
 381 }
 382
 383 void device_set_present(struct device *dev, bool state)
 384 {
 385         if (dev->sys_present == state)
 386                 return;
 387
 388         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 389         dev->sys_present = state;
 390         device_refresh_present(dev);
 391 }
 392
 393 static int device_refcount(struct device *dev)
 394 {
 395         struct list_head *list;
 396         int count = 0;
 397
 398         list_for_each(list, &dev->users.list)
 399                 count++;
 400
 401         list_for_each(list, &dev->aliases.list)
 402                 count++;
 403
 404         return count;
 405 }
 406
 407 void device_add_user(struct device_user *dep, struct device *dev)
 408 {
 409         struct safe_list *head;
 410
 411         if (dep->dev)
 412                 device_remove_user(dep);
 413
 414         if (!dev)
 415                 return;
 416
 417         dep->dev = dev;
 418
 419         if (dep->alias)
 420                 head = &dev->aliases;
 421         else
 422                 head = &dev->users;
 423
 424         safe_list_add(&dep->list, head);
 425         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 426
 427         if (dep->cb && dev->present) {
 428                 dep->cb(dep, DEV_EVENT_ADD);
 429                 if (dev->active)
 430                         dep->cb(dep, DEV_EVENT_UP);
 431         }
 432 }
 433
 434 void
 435 device_free(struct device *dev)
 436 {
 437         __devlock++;
 438         free(dev->config);
 439         device_cleanup(dev);
 440         dev->type->free(dev);
 441         __devlock--;
 442 }
 443
 444 static void
 445 __device_free_unused(struct device *dev)
 446 {
 447         if (!safe_list_empty(&dev->users) ||
 448                 !safe_list_empty(&dev->aliases) ||
 449             dev->current_config || __devlock)
 450                 return;
 451
 452         device_free(dev);
 453 }
 454
 455 void device_remove_user(struct device_user *dep)
 456 {
 457         struct device *dev = dep->dev;
 458
 459         if (!dep->dev)
 460                 return;
 461
 462         dep->hotplug = false;
 463         if (dep->claimed)
 464                 device_release(dep);
 465
 466         safe_list_del(&dep->list);
 467         dep->dev = NULL;
 468         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 469         __device_free_unused(dev);
 470 }
 471
 472 void
 473 device_free_unused(struct device *dev)
 474 {
 475         struct device *tmp;
 476
 477         if (dev)
 478                 return __device_free_unused(dev);
 479
 480         avl_for_each_element_safe(&devices, dev, avl, tmp)
 481                 __device_free_unused(dev);
 482 }
 483
 484 void
 485 device_init_pending(void)
 486 {
 487         struct device *dev, *tmp;
 488
 489         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 490                 if (!dev->config_pending)
 491                         continue;
 492
 493                 dev->type->config_init(dev);
 494                 dev->config_pending = false;
 495         }
 496 }
 497
 498 static enum dev_change_type
 499 device_reload_config(struct device *dev, struct blob_attr *attr)
 500 {
 501         struct blob_attr *tb[__DEV_ATTR_MAX];
 502         const struct config_param_list *cfg = dev->type->config_params;
 503
 504         if (config_check_equal(dev->config, attr, cfg))
 505                 return DEV_CONFIG_NO_CHANGE;
 506
 507         if (cfg == &device_attr_list) {
 508                 memset(tb, 0, sizeof(tb));
 509
 510                 if (attr)
 511                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 512                                 blob_data(attr), blob_len(attr));
 513
 514                 device_init_settings(dev, tb);
 515                 return DEV_CONFIG_RESTART;
 516         } else
 517                 return DEV_CONFIG_RECREATE;
 518 }
 519
 520 enum dev_change_type
 521 device_set_config(struct device *dev, const struct device_type *type,
 522                   struct blob_attr *attr)
 523 {
 524         if (type != dev->type)
 525                 return DEV_CONFIG_RECREATE;
 526
 527         if (dev->type->reload)
 528                 return dev->type->reload(dev, attr);
 529
 530         return device_reload_config(dev, attr);
 531 }
 532
 533 static void
 534 device_replace(struct device *dev, struct device *odev)
 535 {
 536         struct device_user *dep, *tmp;
 537         bool present = odev->present;
 538
 539         if (present)
 540                 device_set_present(odev, false);
 541
 542         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 543                 device_release(dep);
 544                 safe_list_del(&dep->list);
 545                 safe_list_add(&dep->list, &dev->users);
 546                 dep->dev = dev;
 547         }
 548         device_free(odev);
 549
 550         if (present)
 551                 device_set_present(dev, true);
 552 }
 553
 554 void
 555 device_reset_config(void)
 556 {
 557         struct device *dev;
 558
 559         avl_for_each_element(&devices, dev, avl)
 560                 dev->current_config = false;
 561 }
 562
 563 void
 564 device_reset_old(void)
 565 {
 566         struct device *dev, *tmp, *ndev;
 567
 568         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 569                 if (dev->current_config || dev->default_config)
 570                         continue;
 571
 572                 if (dev->type != &simple_device_type)
 573                         continue;
 574
 575                 ndev = device_create_default(dev->ifname, dev->external);
 576                 device_replace(ndev, dev);
 577         }
 578 }
 579
 580 struct device *
 581 device_create(const char *name, const struct device_type *type,
 582               struct blob_attr *config)
 583 {
 584         struct device *odev = NULL, *dev;
 585         enum dev_change_type change;
 586
 587         config = config_memdup(config);
 588         if (!config)
 589                 return NULL;
 590
 591         odev = device_get(name, false);
 592         if (odev) {
 593                 odev->current_config = true;
 594                 change = device_set_config(odev, type, config);
 595                 if (odev->external) {
 596                         system_if_apply_settings(odev, &odev->settings);
 597                         change = DEV_CONFIG_APPLIED;
 598                 }
 599                 switch (change) {
 600                 case DEV_CONFIG_RESTART:
 601                 case DEV_CONFIG_APPLIED:
 602                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 603                         free(odev->config);
 604                         odev->config = config;
 605                         if (change == DEV_CONFIG_RESTART && odev->present) {
 606                                 device_set_present(odev, false);
 607                                 device_set_present(odev, true);
 608                         }
 609                         return odev;
 610                 case DEV_CONFIG_NO_CHANGE:
 611                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 612                         free(config);
 613                         return odev;
 614                 case DEV_CONFIG_RECREATE:
 615                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 616                         device_delete(odev);
 617                         break;
 618                 }
 619         } else
 620                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 621
 622         dev = type->create(name, config);
 623         if (!dev)
 624                 return NULL;
 625
 626         dev->current_config = true;
 627         dev->config = config;
 628         if (odev)
 629                 device_replace(dev, odev);
 630
 631         if (!config_init && dev->config_pending)
 632                 type->config_init(dev);
 633
 634         return dev;
 635 }
 636
 637 void
 638 device_dump_status(struct blob_buf *b, struct device *dev)
 639 {
 640         struct device_settings st;
 641         void *c, *s;
 642
 643         if (!dev) {
 644                 avl_for_each_element(&devices, dev, avl) {
 645                         if (!dev->present)
 646                                 continue;
 647                         c = blobmsg_open_table(b, dev->ifname);
 648                         device_dump_status(b, dev);
 649                         blobmsg_close_table(b, c);
 650                 }
 651
 652                 return;
 653         }
 654
 655         blobmsg_add_u8(b, "external", dev->external);
 656         blobmsg_add_u8(b, "present", dev->present);
 657         blobmsg_add_string(b, "type", dev->type->name);
 658
 659         if (!dev->present)
 660                 return;
 661
 662         blobmsg_add_u8(b, "up", !!dev->active);
 663         if (dev->type->dump_info)
 664                 dev->type->dump_info(dev, b);
 665         else
 666                 system_if_dump_info(dev, b);
 667
 668         if (dev->active) {
 669                 device_merge_settings(dev, &st);
 670                 if (st.flags & DEV_OPT_MTU)
 671                         blobmsg_add_u32(b, "mtu", st.mtu);
 672                 if (st.flags & DEV_OPT_MACADDR)
 673                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 674                 if (st.flags & DEV_OPT_TXQUEUELEN)
 675                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 676         }
 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 }