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
 184 static void __device_broadcast_event(struct list_head *head, enum device_event ev)
 185 {
 186         struct device_user *dep;
 187         static uint8_t idx[__DEV_EVENT_MAX];
 188         bool found;
 189
 190         idx[ev]++;
 191         do {
 192                 found = false;
 193
 194                 list_for_each_entry(dep, head, list) {
 195                         if (!dep->cb)
 196                                 continue;
 197
 198                         if (dep->ev_idx[ev] == idx[ev])
 199                                 continue;
 200
 201                         dep->cb(dep, ev);
 202                         dep->ev_idx[ev] = idx[ev];
 203                         found = true;
 204                         break;
 205                 }
 206         } while (found);
 207 }
 208
 209 void device_broadcast_event(struct device *dev, enum device_event ev)
 210 {
 211         __device_broadcast_event(&dev->aliases, ev);
 212         __device_broadcast_event(&dev->users, ev);
 213 }
 214
 215 int device_claim(struct device_user *dep)
 216 {
 217         struct device *dev = dep->dev;
 218         int ret;
 219
 220         if (dep->claimed)
 221                 return 0;
 222
 223         dep->claimed = true;
 224         D(DEVICE, "Claim %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 225         if (++dev->active != 1)
 226                 return 0;
 227
 228         device_broadcast_event(dev, DEV_EVENT_SETUP);
 229         ret = dev->set_state(dev, true);
 230         if (ret == 0)
 231                 device_broadcast_event(dev, DEV_EVENT_UP);
 232         else {
 233                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 234                 dev->active = 0;
 235                 dep->claimed = false;
 236         }
 237
 238         return ret;
 239 }
 240
 241 void device_release(struct device_user *dep)
 242 {
 243         struct device *dev = dep->dev;
 244
 245         if (!dep->claimed)
 246                 return;
 247
 248         dep->claimed = false;
 249         dev->active--;
 250         D(DEVICE, "Release %s %s, new refcount: %d\n", dev->type->name, dev->ifname, dev->active);
 251         assert(dev->active >= 0);
 252
 253         if (dev->active)
 254                 return;
 255
 256         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 257         if (!dep->hotplug)
 258                 dev->set_state(dev, false);
 259         device_broadcast_event(dev, DEV_EVENT_DOWN);
 260 }
 261
 262 int device_check_state(struct device *dev)
 263 {
 264         if (!dev->type->check_state)
 265                 return 0;
 266
 267         return dev->type->check_state(dev);
 268 }
 269
 270 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 271 {
 272         assert(dev);
 273         assert(type);
 274
 275         if (name)
 276                 strncpy(dev->ifname, name, IFNAMSIZ);
 277
 278         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 279         INIT_LIST_HEAD(&dev->users);
 280         INIT_LIST_HEAD(&dev->aliases);
 281         dev->type = type;
 282
 283         if (!dev->set_state)
 284                 dev->set_state = set_device_state;
 285 }
 286
 287 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 288 {
 289         int ret;
 290
 291         device_init_virtual(dev, type, ifname);
 292
 293         dev->avl.key = dev->ifname;
 294
 295         ret = avl_insert(&devices, &dev->avl);
 296         if (ret < 0)
 297                 return ret;
 298
 299         system_if_clear_state(dev);
 300         device_check_state(dev);
 301
 302         return 0;
 303 }
 304
 305 static struct device *
 306 device_create_default(const char *name, bool external)
 307 {
 308         struct device *dev;
 309
 310         if (!external && system_if_force_external(name))
 311                 return NULL;
 312
 313         D(DEVICE, "Create simple device '%s'\n", name);
 314         dev = calloc(1, sizeof(*dev));
 315         dev->external = external;
 316         dev->set_state = simple_device_set_state;
 317         device_init(dev, &simple_device_type, name);
 318         dev->default_config = true;
 319         return dev;
 320 }
 321
 322 struct device *
 323 device_get(const char *name, int create)
 324 {
 325         struct device *dev;
 326
 327         if (strchr(name, '.'))
 328                 return get_vlan_device_chain(name, create);
 329
 330         if (name[0] == '@')
 331                 return device_alias_get(name + 1);
 332
 333         dev = avl_find_element(&devices, name, dev, avl);
 334         if (dev) {
 335                 if (create > 1 && !dev->external) {
 336                         dev->external = true;
 337                         device_set_present(dev, true);
 338                 }
 339                 return dev;
 340         }
 341
 342         if (!create)
 343                 return NULL;
 344
 345         return device_create_default(name, create > 1);
 346 }
 347
 348 static void
 349 device_delete(struct device *dev)
 350 {
 351         if (!dev->avl.key)
 352                 return;
 353
 354         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 355         avl_delete(&devices, &dev->avl);
 356         dev->avl.key = NULL;
 357 }
 358
 359 void device_cleanup(struct device *dev)
 360 {
 361         struct device_user *dep, *tmp;
 362
 363         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 364         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 365                 if (!dep->cb)
 366                         continue;
 367
 368                 dep->cb(dep, DEV_EVENT_REMOVE);
 369                 device_release(dep);
 370         }
 371
 372         device_delete(dev);
 373 }
 374
 375 static void __device_set_present(struct device *dev, bool state)
 376 {
 377         if (dev->present == state)
 378                 return;
 379
 380         dev->present = state;
 381         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 382 }
 383
 384 void
 385 device_refresh_present(struct device *dev)
 386 {
 387         bool state = dev->sys_present;
 388
 389         if (dev->disabled || dev->deferred)
 390                 state = false;
 391
 392         __device_set_present(dev, state);
 393 }
 394
 395 void device_set_present(struct device *dev, bool state)
 396 {
 397         if (dev->sys_present == state)
 398                 return;
 399
 400         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 401         dev->sys_present = state;
 402         device_refresh_present(dev);
 403 }
 404
 405 static int device_refcount(struct device *dev)
 406 {
 407         struct list_head *list;
 408         int count = 0;
 409
 410         list_for_each(list, &dev->users)
 411                 count++;
 412
 413         return count;
 414 }
 415
 416 void device_add_user(struct device_user *dep, struct device *dev)
 417 {
 418         struct list_head *head;
 419
 420         if (dep->dev)
 421                 device_remove_user(dep);
 422
 423         if (!dev)
 424                 return;
 425
 426         dep->dev = dev;
 427
 428         if (dep->alias)
 429                 head = &dev->aliases;
 430         else
 431                 head = &dev->users;
 432         list_add_tail(&dep->list, head);
 433         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 434
 435         if (dep->cb && dev->present) {
 436                 dep->cb(dep, DEV_EVENT_ADD);
 437                 if (dev->active)
 438                         dep->cb(dep, DEV_EVENT_UP);
 439         }
 440 }
 441
 442 void
 443 device_free(struct device *dev)
 444 {
 445         __devlock++;
 446         free(dev->config);
 447         device_cleanup(dev);
 448         dev->type->free(dev);
 449         __devlock--;
 450 }
 451
 452 static void
 453 __device_free_unused(struct device *dev)
 454 {
 455         if (!list_empty(&dev->users) || dev->current_config || __devlock)
 456                 return;
 457
 458         device_free(dev);
 459 }
 460
 461 void device_remove_user(struct device_user *dep)
 462 {
 463         struct device *dev = dep->dev;
 464
 465         if (!dep->dev)
 466                 return;
 467
 468         dep->hotplug = false;
 469         if (dep->claimed)
 470                 device_release(dep);
 471
 472         list_del(&dep->list);
 473         dep->dev = NULL;
 474         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 475         __device_free_unused(dev);
 476 }
 477
 478 void
 479 device_free_unused(struct device *dev)
 480 {
 481         struct device *tmp;
 482
 483         if (dev)
 484                 return __device_free_unused(dev);
 485
 486         avl_for_each_element_safe(&devices, dev, avl, tmp)
 487                 __device_free_unused(dev);
 488 }
 489
 490 void
 491 device_init_pending(void)
 492 {
 493         struct device *dev, *tmp;
 494
 495         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 496                 if (!dev->config_pending)
 497                         continue;
 498
 499                 dev->type->config_init(dev);
 500                 dev->config_pending = false;
 501         }
 502 }
 503
 504 static enum dev_change_type
 505 device_reload_config(struct device *dev, struct blob_attr *attr)
 506 {
 507         struct blob_attr *tb[__DEV_ATTR_MAX];
 508         const struct config_param_list *cfg = dev->type->config_params;
 509
 510         if (config_check_equal(dev->config, attr, cfg))
 511                 return DEV_CONFIG_NO_CHANGE;
 512
 513         if (cfg == &device_attr_list) {
 514                 memset(tb, 0, sizeof(tb));
 515
 516                 if (attr)
 517                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 518                                 blob_data(attr), blob_len(attr));
 519
 520                 device_init_settings(dev, tb);
 521                 return DEV_CONFIG_RESTART;
 522         } else
 523                 return DEV_CONFIG_RECREATE;
 524 }
 525
 526 enum dev_change_type
 527 device_set_config(struct device *dev, const struct device_type *type,
 528                   struct blob_attr *attr)
 529 {
 530         if (type != dev->type)
 531                 return DEV_CONFIG_RECREATE;
 532
 533         if (dev->type->reload)
 534                 return dev->type->reload(dev, attr);
 535
 536         return device_reload_config(dev, attr);
 537 }
 538
 539 static void
 540 device_replace(struct device *dev, struct device *odev)
 541 {
 542         struct device_user *dep, *tmp;
 543         bool present = odev->present;
 544
 545         if (present)
 546                 device_set_present(odev, false);
 547
 548         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 549                 device_release(dep);
 550                 list_move_tail(&dep->list, &dev->users);
 551                 dep->dev = dev;
 552         }
 553         device_free(odev);
 554
 555         if (present)
 556                 device_set_present(dev, true);
 557 }
 558
 559 void
 560 device_reset_config(void)
 561 {
 562         struct device *dev;
 563
 564         avl_for_each_element(&devices, dev, avl)
 565                 dev->current_config = false;
 566 }
 567
 568 void
 569 device_reset_old(void)
 570 {
 571         struct device *dev, *tmp, *ndev;
 572
 573         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 574                 if (dev->current_config || dev->default_config)
 575                         continue;
 576
 577                 if (dev->type != &simple_device_type)
 578                         continue;
 579
 580                 ndev = device_create_default(dev->ifname, dev->external);
 581                 device_replace(ndev, dev);
 582         }
 583 }
 584
 585 struct device *
 586 device_create(const char *name, const struct device_type *type,
 587               struct blob_attr *config)
 588 {
 589         struct device *odev = NULL, *dev;
 590         enum dev_change_type change;
 591
 592         config = config_memdup(config);
 593         if (!config)
 594                 return NULL;
 595
 596         odev = device_get(name, false);
 597         if (odev) {
 598                 odev->current_config = true;
 599                 change = device_set_config(odev, type, config);
 600                 if (odev->external) {
 601                         system_if_apply_settings(odev, &odev->settings);
 602                         change = DEV_CONFIG_APPLIED;
 603                 }
 604                 switch (change) {
 605                 case DEV_CONFIG_RESTART:
 606                 case DEV_CONFIG_APPLIED:
 607                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 608                         free(odev->config);
 609                         odev->config = config;
 610                         if (change == DEV_CONFIG_RESTART && odev->present) {
 611                                 device_set_present(odev, false);
 612                                 device_set_present(odev, true);
 613                         }
 614                         return odev;
 615                 case DEV_CONFIG_NO_CHANGE:
 616                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 617                         free(config);
 618                         return odev;
 619                 case DEV_CONFIG_RECREATE:
 620                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 621                         device_delete(odev);
 622                         break;
 623                 }
 624         } else
 625                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 626
 627         dev = type->create(name, config);
 628         if (!dev)
 629                 return NULL;
 630
 631         dev->current_config = true;
 632         dev->config = config;
 633         if (odev)
 634                 device_replace(dev, odev);
 635
 636         if (!config_init && dev->config_pending)
 637                 type->config_init(dev);
 638
 639         return dev;
 640 }
 641
 642 void
 643 device_dump_status(struct blob_buf *b, struct device *dev)
 644 {
 645         struct device_settings st;
 646         void *c, *s;
 647
 648         if (!dev) {
 649                 avl_for_each_element(&devices, dev, avl) {
 650                         if (!dev->present)
 651                                 continue;
 652                         c = blobmsg_open_table(b, dev->ifname);
 653                         device_dump_status(b, dev);
 654                         blobmsg_close_table(b, c);
 655                 }
 656
 657                 return;
 658         }
 659
 660         blobmsg_add_u8(b, "external", dev->external);
 661         blobmsg_add_u8(b, "present", dev->present);
 662         blobmsg_add_string(b, "type", dev->type->name);
 663
 664         if (!dev->present)
 665                 return;
 666
 667         blobmsg_add_u8(b, "up", !!dev->active);
 668         if (dev->type->dump_info)
 669                 dev->type->dump_info(dev, b);
 670         else
 671                 system_if_dump_info(dev, b);
 672
 673         if (dev->active) {
 674                 device_merge_settings(dev, &st);
 675                 if (st.flags & DEV_OPT_MTU)
 676                         blobmsg_add_u32(b, "mtu", st.mtu);
 677                 if (st.flags & DEV_OPT_MACADDR)
 678                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 679                 if (st.flags & DEV_OPT_TXQUEUELEN)
 680                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 681         }
 682
 683         s = blobmsg_open_table(b, "statistics");
 684         if (dev->type->dump_stats)
 685                 dev->type->dump_stats(dev, b);
 686         else
 687                 system_if_dump_stats(dev, b);
 688         blobmsg_close_table(b, s);
 689 }