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 <libubox/list.h>
  28
  29 #include "netifd.h"
  30 #include "system.h"
  31 #include "config.h"
  32
  33 static struct list_head devtypes = LIST_HEAD_INIT(devtypes);
  34 static struct avl_tree devices;
  35
  36 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  37         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  38         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  39         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  40         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  41         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  42         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  44         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  45         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  46         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  47         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  48         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  49         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  50         [DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  51         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  52         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  53         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  54         [DEV_ATTR_MULTICAST_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
  55         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  56         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  57         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  58         [DEV_ATTR_SENDREDIRECTS] = { .name = "sendredirects", .type = BLOBMSG_TYPE_BOOL },
  59         [DEV_ATTR_NEIGHLOCKTIME] = { .name = "neighlocktime", .type = BLOBMSG_TYPE_INT32 },
  60         [DEV_ATTR_ISOLATE] = { .name = "isolate", .type = BLOBMSG_TYPE_BOOL },
  61 };
  62
  63 const struct uci_blob_param_list device_attr_list = {
  64         .n_params = __DEV_ATTR_MAX,
  65         .params = dev_attrs,
  66 };
  67
  68 static int __devlock = 0;
  69
  70 int device_type_add(struct device_type *devtype)
  71 {
  72         if (device_type_get(devtype->name)) {
  73                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  74                                    devtype->name);
  75                 return 1;
  76         }
  77
  78         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  79                 devtype->name);
  80
  81         list_add(&devtype->list, &devtypes);
  82         return 0;
  83 }
  84
  85 /* Retrieve the device type for the given name. If 'bridge' is true, the type
  86  * must have bridge capabilities
  87  */
  88 struct device_type *
  89 device_type_get(const char *tname)
  90 {
  91         struct device_type *cur;
  92
  93         list_for_each_entry(cur, &devtypes, list)
  94                 if (!strcmp(cur->name, tname))
  95                         return cur;
  96
  97         return NULL;
  98 }
  99
 100 void device_lock(void)
 101 {
 102         __devlock++;
 103 }
 104
 105 void device_unlock(void)
 106 {
 107         __devlock--;
 108         if (!__devlock)
 109                 device_free_unused(NULL);
 110 }
 111
 112 static int set_device_state(struct device *dev, bool state)
 113 {
 114         if (state) {
 115                 /* Get ifindex for all devices being enabled so a valid  */
 116                 /* ifindex is in place avoiding possible race conditions */
 117                 device_set_ifindex(dev, system_if_resolve(dev));
 118                 if (!dev->ifindex)
 119                         return -1;
 120
 121                 system_if_up(dev);
 122         }
 123         else
 124                 system_if_down(dev);
 125
 126         return 0;
 127 }
 128
 129 static int
 130 simple_device_set_state(struct device *dev, bool state)
 131 {
 132         struct device *pdev;
 133         int ret = 0;
 134
 135         pdev = dev->parent.dev;
 136         if (state && !pdev) {
 137                 pdev = system_if_get_parent(dev);
 138                 if (pdev)
 139                         device_add_user(&dev->parent, pdev);
 140         }
 141
 142         if (pdev) {
 143                 if (state)
 144                         ret = device_claim(&dev->parent);
 145                 else
 146                         device_release(&dev->parent);
 147
 148                 if (ret < 0)
 149                         return ret;
 150         }
 151         return set_device_state(dev, state);
 152 }
 153
 154 static struct device *
 155 simple_device_create(const char *name, struct device_type *devtype,
 156                      struct blob_attr *attr)
 157 {
 158         struct blob_attr *tb[__DEV_ATTR_MAX];
 159         struct device *dev = NULL;
 160
 161         /* device type is unused for simple devices */
 162         devtype = NULL;
 163
 164         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 165         dev = device_get(name, true);
 166         if (!dev)
 167                 return NULL;
 168
 169         dev->set_state = simple_device_set_state;
 170         device_init_settings(dev, tb);
 171
 172         return dev;
 173 }
 174
 175 static void simple_device_free(struct device *dev)
 176 {
 177         if (dev->parent.dev)
 178                 device_remove_user(&dev->parent);
 179         free(dev);
 180 }
 181
 182 struct device_type simple_device_type = {
 183         .name = "Network device",
 184         .config_params = &device_attr_list,
 185
 186         .create = simple_device_create,
 187         .check_state = system_if_check,
 188         .free = simple_device_free,
 189 };
 190
 191 void
 192 device_merge_settings(struct device *dev, struct device_settings *n)
 193 {
 194         struct device_settings *os = &dev->orig_settings;
 195         struct device_settings *s = &dev->settings;
 196
 197         memset(n, 0, sizeof(*n));
 198         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 199         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 200         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 201                 s->txqueuelen : os->txqueuelen;
 202         memcpy(n->macaddr,
 203                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 204                 sizeof(n->macaddr));
 205         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 206         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 207         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 208         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 209         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 210         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 211         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 212                 s->neigh4reachabletime : os->neigh4reachabletime;
 213         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 214                 s->neigh6reachabletime : os->neigh6reachabletime;
 215         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 216                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 217         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 218                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 219         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 220                 s->neigh4locktime : os->neigh4locktime;
 221         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 222                 s->dadtransmits : os->dadtransmits;
 223         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 224                 s->multicast : os->multicast;
 225         n->multicast_to_unicast = s->multicast_to_unicast;
 226         n->multicast_router = s->multicast_router;
 227         n->multicast_fast_leave = s->multicast_fast_leave;
 228         n->learning = s->learning;
 229         n->unicast_flood = s->unicast_flood;
 230         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 231                 s->sendredirects : os->sendredirects;
 232         n->flags = s->flags | os->flags | os->valid_flags;
 233 }
 234
 235 void
 236 device_init_settings(struct device *dev, struct blob_attr **tb)
 237 {
 238         struct device_settings *s = &dev->settings;
 239         struct blob_attr *cur;
 240         struct ether_addr *ea;
 241         bool disabled = false;
 242
 243         s->flags = 0;
 244         if ((cur = tb[DEV_ATTR_ENABLED]))
 245                 disabled = !blobmsg_get_bool(cur);
 246
 247         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 248                 s->mtu = blobmsg_get_u32(cur);
 249                 s->flags |= DEV_OPT_MTU;
 250         }
 251
 252         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 253                 s->mtu6 = blobmsg_get_u32(cur);
 254                 s->flags |= DEV_OPT_MTU6;
 255         }
 256
 257         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 258                 s->txqueuelen = blobmsg_get_u32(cur);
 259                 s->flags |= DEV_OPT_TXQUEUELEN;
 260         }
 261
 262         if ((cur = tb[DEV_ATTR_MACADDR])) {
 263                 ea = ether_aton(blobmsg_data(cur));
 264                 if (ea) {
 265                         memcpy(s->macaddr, ea, 6);
 266                         s->flags |= DEV_OPT_MACADDR;
 267                 }
 268         }
 269
 270         if ((cur = tb[DEV_ATTR_IPV6])) {
 271                 s->ipv6 = blobmsg_get_bool(cur);
 272                 s->flags |= DEV_OPT_IPV6;
 273         }
 274
 275         if ((cur = tb[DEV_ATTR_PROMISC])) {
 276                 s->promisc = blobmsg_get_bool(cur);
 277                 s->flags |= DEV_OPT_PROMISC;
 278         }
 279
 280         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 281                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 282                         s->flags |= DEV_OPT_RPFILTER;
 283                 else
 284                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 285         }
 286
 287         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 288                 s->acceptlocal = blobmsg_get_bool(cur);
 289                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 290         }
 291
 292         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 293                 s->igmpversion = blobmsg_get_u32(cur);
 294                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 295                         s->flags |= DEV_OPT_IGMPVERSION;
 296                 else
 297                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 298         }
 299
 300         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 301                 s->mldversion = blobmsg_get_u32(cur);
 302                 if (s->mldversion >= 1 && s->mldversion <= 2)
 303                         s->flags |= DEV_OPT_MLDVERSION;
 304                 else
 305                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 306         }
 307
 308         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 309                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 310                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 311         }
 312
 313         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 314                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 315                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 316         }
 317
 318         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 319                 s->neigh4locktime = blobmsg_get_u32(cur);
 320                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 321         }
 322
 323         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 324                 s->dadtransmits = blobmsg_get_u32(cur);
 325                 s->flags |= DEV_OPT_DADTRANSMITS;
 326         }
 327
 328         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 329                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 330                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 331         }
 332
 333         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 334                 s->multicast_router = blobmsg_get_u32(cur);
 335                 if (s->multicast_router <= 2)
 336                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 337                 else
 338                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 339         }
 340
 341         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 342                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 343                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 344         }
 345
 346         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 347                 s->multicast = blobmsg_get_bool(cur);
 348                 s->flags |= DEV_OPT_MULTICAST;
 349         }
 350
 351         if ((cur = tb[DEV_ATTR_LEARNING])) {
 352                 s->learning = blobmsg_get_bool(cur);
 353                 s->flags |= DEV_OPT_LEARNING;
 354         }
 355
 356         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 357                 s->unicast_flood = blobmsg_get_bool(cur);
 358                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 359         }
 360
 361         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 362                 s->sendredirects = blobmsg_get_bool(cur);
 363                 s->flags |= DEV_OPT_SENDREDIRECTS;
 364         }
 365
 366         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 367                 s->isolate = blobmsg_get_bool(cur);
 368                 s->flags |= DEV_OPT_ISOLATE;
 369         }
 370
 371         device_set_disabled(dev, disabled);
 372 }
 373
 374 static void __init dev_init(void)
 375 {
 376         avl_init(&devices, avl_strcmp, true, NULL);
 377 }
 378
 379 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 380 {
 381         struct device_user *dep = container_of(list, struct device_user, list);
 382         int *ev = ctx;
 383
 384         /* device might have been removed by an earlier callback */
 385         if (!dep->dev)
 386                 return 0;
 387
 388         if (dep->cb)
 389                 dep->cb(dep, *ev);
 390         return 0;
 391 }
 392
 393 void device_broadcast_event(struct device *dev, enum device_event ev)
 394 {
 395         int dev_ev = ev;
 396
 397         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 398         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 399 }
 400
 401 int device_claim(struct device_user *dep)
 402 {
 403         struct device *dev = dep->dev;
 404         int ret = 0;
 405
 406         if (dep->claimed)
 407                 return 0;
 408
 409         if (!dev)
 410                 return -1;
 411
 412         dep->claimed = true;
 413         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 414         if (++dev->active != 1)
 415                 return 0;
 416
 417         device_broadcast_event(dev, DEV_EVENT_SETUP);
 418         if (dev->external) {
 419                 /* Get ifindex for external claimed devices so a valid   */
 420                 /* ifindex is in place avoiding possible race conditions */
 421                 device_set_ifindex(dev, system_if_resolve(dev));
 422                 if (!dev->ifindex)
 423                         ret = -1;
 424
 425                 system_if_get_settings(dev, &dev->orig_settings);
 426         } else
 427                 ret = dev->set_state(dev, true);
 428
 429         if (ret == 0)
 430                 device_broadcast_event(dev, DEV_EVENT_UP);
 431         else {
 432                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 433                 dev->active = 0;
 434                 dep->claimed = false;
 435         }
 436
 437         return ret;
 438 }
 439
 440 void device_release(struct device_user *dep)
 441 {
 442         struct device *dev = dep->dev;
 443
 444         if (!dep->claimed)
 445                 return;
 446
 447         dep->claimed = false;
 448         dev->active--;
 449         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 450         assert(dev->active >= 0);
 451
 452         if (dev->active)
 453                 return;
 454
 455         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 456         if (!dev->external)
 457                 dev->set_state(dev, false);
 458
 459         if (dev->active)
 460                 return;
 461
 462         device_broadcast_event(dev, DEV_EVENT_DOWN);
 463 }
 464
 465 int device_check_state(struct device *dev)
 466 {
 467         if (!dev->type->check_state)
 468                 return simple_device_type.check_state(dev);
 469
 470         return dev->type->check_state(dev);
 471 }
 472
 473 void device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 474 {
 475         assert(dev);
 476         assert(type);
 477
 478         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 479         INIT_SAFE_LIST(&dev->users);
 480         INIT_SAFE_LIST(&dev->aliases);
 481         dev->type = type;
 482
 483         if (name)
 484                 device_set_ifname(dev, name);
 485
 486         if (!dev->set_state)
 487                 dev->set_state = set_device_state;
 488 }
 489
 490 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 491 {
 492         int ret;
 493
 494         device_init_virtual(dev, type, ifname);
 495
 496         dev->avl.key = dev->ifname;
 497
 498         ret = avl_insert(&devices, &dev->avl);
 499         if (ret < 0)
 500                 return ret;
 501
 502         system_if_clear_state(dev);
 503         device_check_state(dev);
 504
 505         return 0;
 506 }
 507
 508 static struct device *
 509 device_create_default(const char *name, bool external)
 510 {
 511         struct device *dev;
 512
 513         if (!external && system_if_force_external(name))
 514                 return NULL;
 515
 516         D(DEVICE, "Create simple device '%s'\n", name);
 517         dev = calloc(1, sizeof(*dev));
 518         if (!dev)
 519                 return NULL;
 520
 521         dev->external = external;
 522         dev->set_state = simple_device_set_state;
 523         device_init(dev, &simple_device_type, name);
 524         dev->default_config = true;
 525         if (external)
 526                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 527         return dev;
 528 }
 529
 530 struct device *
 531 device_find(const char *name)
 532 {
 533         struct device *dev;
 534
 535         return avl_find_element(&devices, name, dev, avl);
 536 }
 537
 538 struct device *
 539 device_get(const char *name, int create)
 540 {
 541         struct device *dev;
 542
 543         if (strchr(name, '.'))
 544                 return get_vlan_device_chain(name, create);
 545
 546         if (name[0] == '@')
 547                 return device_alias_get(name + 1);
 548
 549         dev = avl_find_element(&devices, name, dev, avl);
 550         if (dev) {
 551                 if (create > 1 && !dev->external) {
 552                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 553                         dev->external = true;
 554                         device_set_present(dev, true);
 555                 }
 556                 return dev;
 557         }
 558
 559         if (!create)
 560                 return NULL;
 561
 562         return device_create_default(name, create > 1);
 563 }
 564
 565 static void
 566 device_delete(struct device *dev)
 567 {
 568         if (!dev->avl.key)
 569                 return;
 570
 571         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 572         avl_delete(&devices, &dev->avl);
 573         dev->avl.key = NULL;
 574 }
 575
 576 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 577 {
 578         struct device_user *dep = container_of(list, struct device_user, list);
 579         if (dep->cb)
 580                 dep->cb(dep, DEV_EVENT_REMOVE);
 581
 582         device_release(dep);
 583         return 0;
 584 }
 585
 586 void device_cleanup(struct device *dev)
 587 {
 588         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 589         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 590         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 591         device_delete(dev);
 592 }
 593
 594 static void __device_set_present(struct device *dev, bool state)
 595 {
 596         if (dev->present == state)
 597                 return;
 598
 599         dev->present = state;
 600         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 601 }
 602
 603 void
 604 device_refresh_present(struct device *dev)
 605 {
 606         bool state = dev->sys_present;
 607
 608         if (dev->disabled || dev->deferred)
 609                 state = false;
 610
 611         __device_set_present(dev, state);
 612 }
 613
 614 void device_set_present(struct device *dev, bool state)
 615 {
 616         if (dev->sys_present == state)
 617                 return;
 618
 619         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 620         dev->sys_present = state;
 621         device_refresh_present(dev);
 622 }
 623
 624 void device_set_link(struct device *dev, bool state)
 625 {
 626         if (dev->link_active == state)
 627                 return;
 628
 629         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 630
 631         dev->link_active = state;
 632         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 633 }
 634
 635 void device_set_ifindex(struct device *dev, int ifindex)
 636 {
 637         if (dev->ifindex == ifindex)
 638                 return;
 639
 640         dev->ifindex = ifindex;
 641         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 642 }
 643
 644 int device_set_ifname(struct device *dev, const char *name)
 645 {
 646         int ret = 0;
 647
 648         if (!strcmp(dev->ifname, name))
 649                 return 0;
 650
 651         if (dev->avl.key)
 652                 avl_delete(&devices, &dev->avl);
 653
 654         strncpy(dev->ifname, name, IFNAMSIZ);
 655
 656         if (dev->avl.key)
 657                 ret = avl_insert(&devices, &dev->avl);
 658
 659         if (ret == 0)
 660                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 661
 662         return ret;
 663 }
 664
 665 static int device_refcount(struct device *dev)
 666 {
 667         struct list_head *list;
 668         int count = 0;
 669
 670         list_for_each(list, &dev->users.list)
 671                 count++;
 672
 673         list_for_each(list, &dev->aliases.list)
 674                 count++;
 675
 676         return count;
 677 }
 678
 679 static void
 680 __device_add_user(struct device_user *dep, struct device *dev)
 681 {
 682         struct safe_list *head;
 683
 684         dep->dev = dev;
 685
 686         if (dep->alias)
 687                 head = &dev->aliases;
 688         else
 689                 head = &dev->users;
 690
 691         safe_list_add(&dep->list, head);
 692         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 693
 694         if (dep->cb && dev->present) {
 695                 dep->cb(dep, DEV_EVENT_ADD);
 696                 if (dev->active)
 697                         dep->cb(dep, DEV_EVENT_UP);
 698
 699                 if (dev->link_active)
 700                         dep->cb(dep, DEV_EVENT_LINK_UP);
 701         }
 702 }
 703
 704 void device_add_user(struct device_user *dep, struct device *dev)
 705 {
 706         if (dep->dev == dev)
 707                 return;
 708
 709         if (dep->dev)
 710                 device_remove_user(dep);
 711
 712         if (!dev)
 713                 return;
 714
 715         __device_add_user(dep, dev);
 716 }
 717
 718 void
 719 device_free(struct device *dev)
 720 {
 721         __devlock++;
 722         free(dev->config);
 723         device_cleanup(dev);
 724         dev->type->free(dev);
 725         __devlock--;
 726 }
 727
 728 static void
 729 __device_free_unused(struct device *dev)
 730 {
 731         if (!safe_list_empty(&dev->users) ||
 732                 !safe_list_empty(&dev->aliases) ||
 733             dev->current_config || __devlock)
 734                 return;
 735
 736         device_free(dev);
 737 }
 738
 739 void device_remove_user(struct device_user *dep)
 740 {
 741         struct device *dev = dep->dev;
 742
 743         if (!dep->dev)
 744                 return;
 745
 746         dep->hotplug = false;
 747         if (dep->claimed)
 748                 device_release(dep);
 749
 750         safe_list_del(&dep->list);
 751         dep->dev = NULL;
 752         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 753         __device_free_unused(dev);
 754 }
 755
 756 void
 757 device_free_unused(struct device *dev)
 758 {
 759         struct device *tmp;
 760
 761         if (dev)
 762                 return __device_free_unused(dev);
 763
 764         avl_for_each_element_safe(&devices, dev, avl, tmp)
 765                 __device_free_unused(dev);
 766 }
 767
 768 void
 769 device_init_pending(void)
 770 {
 771         struct device *dev, *tmp;
 772
 773         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 774                 if (!dev->config_pending)
 775                         continue;
 776
 777                 dev->type->config_init(dev);
 778                 dev->config_pending = false;
 779         }
 780 }
 781
 782 static enum dev_change_type
 783 device_set_config(struct device *dev, struct device_type *type,
 784                   struct blob_attr *attr)
 785 {
 786         struct blob_attr *tb[__DEV_ATTR_MAX];
 787         const struct uci_blob_param_list *cfg = type->config_params;
 788
 789         if (type != dev->type)
 790                 return DEV_CONFIG_RECREATE;
 791
 792         if (dev->type->reload)
 793                 return dev->type->reload(dev, attr);
 794
 795         if (uci_blob_check_equal(dev->config, attr, cfg))
 796                 return DEV_CONFIG_NO_CHANGE;
 797
 798         if (cfg == &device_attr_list) {
 799                 memset(tb, 0, sizeof(tb));
 800
 801                 if (attr)
 802                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 803                                 blob_data(attr), blob_len(attr));
 804
 805                 device_init_settings(dev, tb);
 806                 return DEV_CONFIG_RESTART;
 807         } else
 808                 return DEV_CONFIG_RECREATE;
 809 }
 810
 811 enum dev_change_type
 812 device_apply_config(struct device *dev, struct device_type *type,
 813                     struct blob_attr *config)
 814 {
 815         enum dev_change_type change;
 816
 817         change = device_set_config(dev, type, config);
 818         if (dev->external) {
 819                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 820                 change = DEV_CONFIG_APPLIED;
 821         }
 822
 823         switch (change) {
 824                 case DEV_CONFIG_RESTART:
 825                 case DEV_CONFIG_APPLIED:
 826                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 827                         config = blob_memdup(config);
 828                         free(dev->config);
 829                         dev->config = config;
 830                         if (change == DEV_CONFIG_RESTART && dev->present) {
 831                                 int ret = 0;
 832
 833                                 device_set_present(dev, false);
 834                                 if (dev->active && !dev->external) {
 835                                         ret = dev->set_state(dev, false);
 836                                         if (!ret)
 837                                                 ret = dev->set_state(dev, true);
 838                                 }
 839                                 if (!ret)
 840                                         device_set_present(dev, true);
 841                         }
 842                         break;
 843                 case DEV_CONFIG_NO_CHANGE:
 844                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 845                         break;
 846                 case DEV_CONFIG_RECREATE:
 847                         break;
 848         }
 849
 850         return change;
 851 }
 852
 853 static void
 854 device_replace(struct device *dev, struct device *odev)
 855 {
 856         struct device_user *dep, *tmp;
 857
 858         __devlock++;
 859         if (odev->present)
 860                 device_set_present(odev, false);
 861
 862         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 863                 device_release(dep);
 864                 safe_list_del(&dep->list);
 865                 __device_add_user(dep, dev);
 866         }
 867         __devlock--;
 868
 869         device_free(odev);
 870 }
 871
 872 void
 873 device_reset_config(void)
 874 {
 875         struct device *dev;
 876
 877         avl_for_each_element(&devices, dev, avl)
 878                 dev->current_config = false;
 879 }
 880
 881 void
 882 device_reset_old(void)
 883 {
 884         struct device *dev, *tmp, *ndev;
 885
 886         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 887                 if (dev->current_config || dev->default_config)
 888                         continue;
 889
 890                 if (dev->type != &simple_device_type)
 891                         continue;
 892
 893                 ndev = device_create_default(dev->ifname, dev->external);
 894                 if (!ndev)
 895                         continue;
 896
 897                 device_replace(ndev, dev);
 898         }
 899 }
 900
 901 struct device *
 902 device_create(const char *name, struct device_type *type,
 903               struct blob_attr *config)
 904 {
 905         struct device *odev = NULL, *dev;
 906         enum dev_change_type change;
 907
 908         odev = device_find(name);
 909         if (odev) {
 910                 odev->current_config = true;
 911                 change = device_apply_config(odev, type, config);
 912                 switch (change) {
 913                 case DEV_CONFIG_RECREATE:
 914                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 915                         device_delete(odev);
 916                         break;
 917                 default:
 918                         return odev;
 919                 }
 920         } else
 921                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 922
 923         config = blob_memdup(config);
 924         if (!config)
 925                 return NULL;
 926
 927         dev = type->create(name, type, config);
 928         if (!dev)
 929                 return NULL;
 930
 931         dev->current_config = true;
 932         dev->config = config;
 933         if (odev)
 934                 device_replace(dev, odev);
 935
 936         if (!config_init && dev->config_pending) {
 937                 type->config_init(dev);
 938                 dev->config_pending = false;
 939         }
 940
 941         return dev;
 942 }
 943
 944 void
 945 device_dump_status(struct blob_buf *b, struct device *dev)
 946 {
 947         struct device_settings st;
 948         void *c, *s;
 949
 950         if (!dev) {
 951                 avl_for_each_element(&devices, dev, avl) {
 952                         if (!dev->present)
 953                                 continue;
 954                         c = blobmsg_open_table(b, dev->ifname);
 955                         device_dump_status(b, dev);
 956                         blobmsg_close_table(b, c);
 957                 }
 958
 959                 return;
 960         }
 961
 962         blobmsg_add_u8(b, "external", dev->external);
 963         blobmsg_add_u8(b, "present", dev->present);
 964         blobmsg_add_string(b, "type", dev->type->name);
 965
 966         if (!dev->present)
 967                 return;
 968
 969         blobmsg_add_u8(b, "up", !!dev->active);
 970         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 971
 972         if (dev->type->dump_info)
 973                 dev->type->dump_info(dev, b);
 974         else
 975                 system_if_dump_info(dev, b);
 976
 977         if (dev->active) {
 978                 device_merge_settings(dev, &st);
 979                 if (st.flags & DEV_OPT_MTU)
 980                         blobmsg_add_u32(b, "mtu", st.mtu);
 981                 if (st.flags & DEV_OPT_MTU6)
 982                         blobmsg_add_u32(b, "mtu6", st.mtu6);
 983                 if (st.flags & DEV_OPT_MACADDR)
 984                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 985                 if (st.flags & DEV_OPT_TXQUEUELEN)
 986                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 987                 if (st.flags & DEV_OPT_IPV6)
 988                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 989                 if (st.flags & DEV_OPT_PROMISC)
 990                         blobmsg_add_u8(b, "promisc", st.promisc);
 991                 if (st.flags & DEV_OPT_RPFILTER)
 992                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 993                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
 994                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 995                 if (st.flags & DEV_OPT_IGMPVERSION)
 996                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
 997                 if (st.flags & DEV_OPT_MLDVERSION)
 998                         blobmsg_add_u32(b, "mldversion", st.mldversion);
 999                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1000                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1001                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1002                 }
1003                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1004                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1005                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1006                 }
1007                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1008                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1009                 if (st.flags & DEV_OPT_DADTRANSMITS)
1010                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1011                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1012                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1013                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1014                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1015                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1016                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1017                 if (st.flags & DEV_OPT_MULTICAST)
1018                         blobmsg_add_u8(b, "multicast", st.multicast);
1019                 if (st.flags & DEV_OPT_LEARNING)
1020                         blobmsg_add_u8(b, "learning", st.learning);
1021                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1022                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1023                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1024                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1025         }
1026
1027         s = blobmsg_open_table(b, "statistics");
1028         if (dev->type->dump_stats)
1029                 dev->type->dump_stats(dev, b);
1030         else
1031                 system_if_dump_stats(dev, b);
1032         blobmsg_close_table(b, s);
1033 }
1034
1035 static void __init simple_device_type_init(void)
1036 {
1037         device_type_add(&simple_device_type);
1038 }