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 device_vlan_len(struct kvlist *kv, const void *data)
 113 {
 114         return sizeof(unsigned int);
 115 }
 116
 117 void device_vlan_update(bool done)
 118 {
 119         struct device *dev;
 120
 121         avl_for_each_element(&devices, dev, avl) {
 122                 if (!dev->vlans.update)
 123                         continue;
 124
 125                 if (!done) {
 126                         if (dev->vlan_aliases.get_len)
 127                                 kvlist_free(&dev->vlan_aliases);
 128                         else
 129                                 kvlist_init(&dev->vlan_aliases, device_vlan_len);
 130                         vlist_update(&dev->vlans);
 131                 } else {
 132                         vlist_flush(&dev->vlans);
 133                 }
 134         }
 135 }
 136
 137 static int set_device_state(struct device *dev, bool state)
 138 {
 139         if (state) {
 140                 /* Get ifindex for all devices being enabled so a valid  */
 141                 /* ifindex is in place avoiding possible race conditions */
 142                 device_set_ifindex(dev, system_if_resolve(dev));
 143                 if (!dev->ifindex)
 144                         return -1;
 145
 146                 system_if_up(dev);
 147         }
 148         else
 149                 system_if_down(dev);
 150
 151         return 0;
 152 }
 153
 154 static int
 155 simple_device_set_state(struct device *dev, bool state)
 156 {
 157         struct device *pdev;
 158         int ret = 0;
 159
 160         pdev = dev->parent.dev;
 161         if (state && !pdev) {
 162                 pdev = system_if_get_parent(dev);
 163                 if (pdev)
 164                         device_add_user(&dev->parent, pdev);
 165         }
 166
 167         if (pdev) {
 168                 if (state)
 169                         ret = device_claim(&dev->parent);
 170                 else
 171                         device_release(&dev->parent);
 172
 173                 if (ret < 0)
 174                         return ret;
 175         }
 176         return set_device_state(dev, state);
 177 }
 178
 179 static struct device *
 180 simple_device_create(const char *name, struct device_type *devtype,
 181                      struct blob_attr *attr)
 182 {
 183         struct blob_attr *tb[__DEV_ATTR_MAX];
 184         struct device *dev = NULL;
 185
 186         /* device type is unused for simple devices */
 187         devtype = NULL;
 188
 189         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 190         dev = device_get(name, true);
 191         if (!dev)
 192                 return NULL;
 193
 194         dev->set_state = simple_device_set_state;
 195         device_init_settings(dev, tb);
 196
 197         return dev;
 198 }
 199
 200 static void simple_device_free(struct device *dev)
 201 {
 202         if (dev->parent.dev)
 203                 device_remove_user(&dev->parent);
 204         free(dev);
 205 }
 206
 207 struct device_type simple_device_type = {
 208         .name = "Network device",
 209         .config_params = &device_attr_list,
 210
 211         .create = simple_device_create,
 212         .check_state = system_if_check,
 213         .free = simple_device_free,
 214 };
 215
 216 void
 217 device_merge_settings(struct device *dev, struct device_settings *n)
 218 {
 219         struct device_settings *os = &dev->orig_settings;
 220         struct device_settings *s = &dev->settings;
 221
 222         memset(n, 0, sizeof(*n));
 223         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 224         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 225         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 226                 s->txqueuelen : os->txqueuelen;
 227         memcpy(n->macaddr,
 228                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 229                 sizeof(n->macaddr));
 230         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 231         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 232         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 233         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 234         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 235         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 236         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 237                 s->neigh4reachabletime : os->neigh4reachabletime;
 238         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 239                 s->neigh6reachabletime : os->neigh6reachabletime;
 240         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 241                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 242         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 243                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 244         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 245                 s->neigh4locktime : os->neigh4locktime;
 246         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 247                 s->dadtransmits : os->dadtransmits;
 248         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 249                 s->multicast : os->multicast;
 250         n->multicast_to_unicast = s->multicast_to_unicast;
 251         n->multicast_router = s->multicast_router;
 252         n->multicast_fast_leave = s->multicast_fast_leave;
 253         n->learning = s->learning;
 254         n->unicast_flood = s->unicast_flood;
 255         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 256                 s->sendredirects : os->sendredirects;
 257         n->flags = s->flags | os->flags | os->valid_flags;
 258 }
 259
 260 void
 261 device_init_settings(struct device *dev, struct blob_attr **tb)
 262 {
 263         struct device_settings *s = &dev->settings;
 264         struct blob_attr *cur;
 265         struct ether_addr *ea;
 266         bool disabled = false;
 267
 268         s->flags = 0;
 269         if ((cur = tb[DEV_ATTR_ENABLED]))
 270                 disabled = !blobmsg_get_bool(cur);
 271
 272         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 273                 s->mtu = blobmsg_get_u32(cur);
 274                 s->flags |= DEV_OPT_MTU;
 275         }
 276
 277         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 278                 s->mtu6 = blobmsg_get_u32(cur);
 279                 s->flags |= DEV_OPT_MTU6;
 280         }
 281
 282         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 283                 s->txqueuelen = blobmsg_get_u32(cur);
 284                 s->flags |= DEV_OPT_TXQUEUELEN;
 285         }
 286
 287         if ((cur = tb[DEV_ATTR_MACADDR])) {
 288                 ea = ether_aton(blobmsg_data(cur));
 289                 if (ea) {
 290                         memcpy(s->macaddr, ea, 6);
 291                         s->flags |= DEV_OPT_MACADDR;
 292                 }
 293         }
 294
 295         if ((cur = tb[DEV_ATTR_IPV6])) {
 296                 s->ipv6 = blobmsg_get_bool(cur);
 297                 s->flags |= DEV_OPT_IPV6;
 298         }
 299
 300         if ((cur = tb[DEV_ATTR_PROMISC])) {
 301                 s->promisc = blobmsg_get_bool(cur);
 302                 s->flags |= DEV_OPT_PROMISC;
 303         }
 304
 305         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 306                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 307                         s->flags |= DEV_OPT_RPFILTER;
 308                 else
 309                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 310         }
 311
 312         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 313                 s->acceptlocal = blobmsg_get_bool(cur);
 314                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 315         }
 316
 317         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 318                 s->igmpversion = blobmsg_get_u32(cur);
 319                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 320                         s->flags |= DEV_OPT_IGMPVERSION;
 321                 else
 322                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 323         }
 324
 325         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 326                 s->mldversion = blobmsg_get_u32(cur);
 327                 if (s->mldversion >= 1 && s->mldversion <= 2)
 328                         s->flags |= DEV_OPT_MLDVERSION;
 329                 else
 330                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 331         }
 332
 333         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 334                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 335                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 336         }
 337
 338         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 339                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 340                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 341         }
 342
 343         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 344                 s->neigh4locktime = blobmsg_get_u32(cur);
 345                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 346         }
 347
 348         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 349                 s->dadtransmits = blobmsg_get_u32(cur);
 350                 s->flags |= DEV_OPT_DADTRANSMITS;
 351         }
 352
 353         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 354                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 355                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 356         }
 357
 358         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 359                 s->multicast_router = blobmsg_get_u32(cur);
 360                 if (s->multicast_router <= 2)
 361                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 362                 else
 363                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 364         }
 365
 366         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 367                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 368                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 369         }
 370
 371         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 372                 s->multicast = blobmsg_get_bool(cur);
 373                 s->flags |= DEV_OPT_MULTICAST;
 374         }
 375
 376         if ((cur = tb[DEV_ATTR_LEARNING])) {
 377                 s->learning = blobmsg_get_bool(cur);
 378                 s->flags |= DEV_OPT_LEARNING;
 379         }
 380
 381         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 382                 s->unicast_flood = blobmsg_get_bool(cur);
 383                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 384         }
 385
 386         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 387                 s->sendredirects = blobmsg_get_bool(cur);
 388                 s->flags |= DEV_OPT_SENDREDIRECTS;
 389         }
 390
 391         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 392                 s->isolate = blobmsg_get_bool(cur);
 393                 s->flags |= DEV_OPT_ISOLATE;
 394         }
 395
 396         device_set_disabled(dev, disabled);
 397 }
 398
 399 static void __init dev_init(void)
 400 {
 401         avl_init(&devices, avl_strcmp, true, NULL);
 402 }
 403
 404 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 405 {
 406         struct device_user *dep = container_of(list, struct device_user, list);
 407         int *ev = ctx;
 408
 409         /* device might have been removed by an earlier callback */
 410         if (!dep->dev)
 411                 return 0;
 412
 413         if (dep->cb)
 414                 dep->cb(dep, *ev);
 415         return 0;
 416 }
 417
 418 void device_broadcast_event(struct device *dev, enum device_event ev)
 419 {
 420         int dev_ev = ev;
 421
 422         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 423         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 424 }
 425
 426 int device_claim(struct device_user *dep)
 427 {
 428         struct device *dev = dep->dev;
 429         int ret = 0;
 430
 431         if (dep->claimed)
 432                 return 0;
 433
 434         if (!dev)
 435                 return -1;
 436
 437         dep->claimed = true;
 438         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 439         if (++dev->active != 1)
 440                 return 0;
 441
 442         device_broadcast_event(dev, DEV_EVENT_SETUP);
 443         if (dev->external) {
 444                 /* Get ifindex for external claimed devices so a valid   */
 445                 /* ifindex is in place avoiding possible race conditions */
 446                 device_set_ifindex(dev, system_if_resolve(dev));
 447                 if (!dev->ifindex)
 448                         ret = -1;
 449
 450                 system_if_get_settings(dev, &dev->orig_settings);
 451         } else
 452                 ret = dev->set_state(dev, true);
 453
 454         if (ret == 0)
 455                 device_broadcast_event(dev, DEV_EVENT_UP);
 456         else {
 457                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 458                 dev->active = 0;
 459                 dep->claimed = false;
 460         }
 461
 462         return ret;
 463 }
 464
 465 void device_release(struct device_user *dep)
 466 {
 467         struct device *dev = dep->dev;
 468
 469         if (!dep->claimed)
 470                 return;
 471
 472         dep->claimed = false;
 473         dev->active--;
 474         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 475         assert(dev->active >= 0);
 476
 477         if (dev->active)
 478                 return;
 479
 480         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 481         if (!dev->external)
 482                 dev->set_state(dev, false);
 483
 484         if (dev->active)
 485                 return;
 486
 487         device_broadcast_event(dev, DEV_EVENT_DOWN);
 488 }
 489
 490 int device_check_state(struct device *dev)
 491 {
 492         if (!dev->type->check_state)
 493                 return simple_device_type.check_state(dev);
 494
 495         return dev->type->check_state(dev);
 496 }
 497
 498 int device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 499 {
 500         assert(dev);
 501         assert(type);
 502
 503         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 504         INIT_SAFE_LIST(&dev->users);
 505         INIT_SAFE_LIST(&dev->aliases);
 506         dev->type = type;
 507
 508         if (name) {
 509                 int ret;
 510
 511                 ret = device_set_ifname(dev, name);
 512                 if (ret < 0)
 513                         return ret;
 514         }
 515
 516         if (!dev->set_state)
 517                 dev->set_state = set_device_state;
 518
 519         return 0;
 520 }
 521
 522 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 523 {
 524         int ret;
 525
 526         ret = device_init_virtual(dev, type, ifname);
 527         if (ret < 0)
 528                 return ret;
 529
 530         dev->avl.key = dev->ifname;
 531
 532         ret = avl_insert(&devices, &dev->avl);
 533         if (ret < 0)
 534                 return ret;
 535
 536         system_if_clear_state(dev);
 537
 538         return 0;
 539 }
 540
 541 static struct device *
 542 device_create_default(const char *name, bool external)
 543 {
 544         struct device *dev;
 545
 546         if (!external && system_if_force_external(name))
 547                 return NULL;
 548
 549         D(DEVICE, "Create simple device '%s'\n", name);
 550         dev = calloc(1, sizeof(*dev));
 551         if (!dev)
 552                 return NULL;
 553
 554         dev->external = external;
 555         dev->set_state = simple_device_set_state;
 556
 557         if (device_init(dev, &simple_device_type, name) < 0) {
 558                 device_cleanup(dev);
 559                 free(dev);
 560                 return NULL;
 561         }
 562
 563         dev->default_config = true;
 564         if (external)
 565                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 566
 567         device_check_state(dev);
 568
 569         return dev;
 570 }
 571
 572 struct device *
 573 device_find(const char *name)
 574 {
 575         struct device *dev;
 576
 577         return avl_find_element(&devices, name, dev, avl);
 578 }
 579
 580 struct device *
 581 device_get(const char *name, int create)
 582 {
 583         struct device *dev;
 584
 585         dev = avl_find_element(&devices, name, dev, avl);
 586
 587         if (!dev && strchr(name, '.'))
 588                 return get_vlan_device_chain(name, create);
 589
 590         if (name[0] == '@')
 591                 return device_alias_get(name + 1);
 592
 593         if (dev) {
 594                 if (create > 1 && !dev->external) {
 595                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 596                         dev->external = true;
 597                         device_set_present(dev, true);
 598                 }
 599                 return dev;
 600         }
 601
 602         if (!create)
 603                 return NULL;
 604
 605         return device_create_default(name, create > 1);
 606 }
 607
 608 static void
 609 device_delete(struct device *dev)
 610 {
 611         if (!dev->avl.key)
 612                 return;
 613
 614         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 615         avl_delete(&devices, &dev->avl);
 616         dev->avl.key = NULL;
 617 }
 618
 619 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 620 {
 621         struct device_user *dep = container_of(list, struct device_user, list);
 622         if (dep->cb)
 623                 dep->cb(dep, DEV_EVENT_REMOVE);
 624
 625         device_release(dep);
 626         return 0;
 627 }
 628
 629 void device_cleanup(struct device *dev)
 630 {
 631         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 632         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 633         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 634         device_delete(dev);
 635 }
 636
 637 static void __device_set_present(struct device *dev, bool state)
 638 {
 639         if (dev->present == state)
 640                 return;
 641
 642         dev->present = state;
 643         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 644 }
 645
 646 void
 647 device_refresh_present(struct device *dev)
 648 {
 649         bool state = dev->sys_present;
 650
 651         if (dev->disabled || dev->deferred)
 652                 state = false;
 653
 654         __device_set_present(dev, state);
 655 }
 656
 657 void device_set_present(struct device *dev, bool state)
 658 {
 659         if (dev->sys_present == state)
 660                 return;
 661
 662         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 663         dev->sys_present = state;
 664         device_refresh_present(dev);
 665 }
 666
 667 void device_set_link(struct device *dev, bool state)
 668 {
 669         if (dev->link_active == state)
 670                 return;
 671
 672         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 673
 674         dev->link_active = state;
 675         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 676 }
 677
 678 void device_set_ifindex(struct device *dev, int ifindex)
 679 {
 680         if (dev->ifindex == ifindex)
 681                 return;
 682
 683         dev->ifindex = ifindex;
 684         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 685 }
 686
 687 int device_set_ifname(struct device *dev, const char *name)
 688 {
 689         int ret = 0;
 690
 691         if (!strcmp(dev->ifname, name))
 692                 return 0;
 693
 694         if (strlen(name) > sizeof(dev->ifname) - 1)
 695                 return -1;
 696
 697         if (dev->avl.key)
 698                 avl_delete(&devices, &dev->avl);
 699
 700         strcpy(dev->ifname, name);
 701
 702         if (dev->avl.key)
 703                 ret = avl_insert(&devices, &dev->avl);
 704
 705         if (ret == 0)
 706                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 707
 708         return ret;
 709 }
 710
 711 static int device_refcount(struct device *dev)
 712 {
 713         struct list_head *list;
 714         int count = 0;
 715
 716         list_for_each(list, &dev->users.list)
 717                 count++;
 718
 719         list_for_each(list, &dev->aliases.list)
 720                 count++;
 721
 722         return count;
 723 }
 724
 725 static void
 726 __device_add_user(struct device_user *dep, struct device *dev)
 727 {
 728         struct safe_list *head;
 729
 730         dep->dev = dev;
 731
 732         if (dep->alias)
 733                 head = &dev->aliases;
 734         else
 735                 head = &dev->users;
 736
 737         safe_list_add(&dep->list, head);
 738         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 739
 740         if (dep->cb && dev->present) {
 741                 dep->cb(dep, DEV_EVENT_ADD);
 742                 if (dev->active)
 743                         dep->cb(dep, DEV_EVENT_UP);
 744
 745                 if (dev->link_active)
 746                         dep->cb(dep, DEV_EVENT_LINK_UP);
 747         }
 748 }
 749
 750 void device_add_user(struct device_user *dep, struct device *dev)
 751 {
 752         if (dep->dev == dev)
 753                 return;
 754
 755         if (dep->dev)
 756                 device_remove_user(dep);
 757
 758         if (!dev)
 759                 return;
 760
 761         __device_add_user(dep, dev);
 762 }
 763
 764 static void
 765 device_free(struct device *dev)
 766 {
 767         __devlock++;
 768         free(dev->config);
 769         device_cleanup(dev);
 770         dev->type->free(dev);
 771         __devlock--;
 772 }
 773
 774 static void
 775 __device_free_unused(struct device *dev)
 776 {
 777         if (!safe_list_empty(&dev->users) ||
 778                 !safe_list_empty(&dev->aliases) ||
 779             dev->current_config || __devlock)
 780                 return;
 781
 782         device_free(dev);
 783 }
 784
 785 void device_remove_user(struct device_user *dep)
 786 {
 787         struct device *dev = dep->dev;
 788
 789         if (!dep->dev)
 790                 return;
 791
 792         dep->hotplug = false;
 793         if (dep->claimed)
 794                 device_release(dep);
 795
 796         safe_list_del(&dep->list);
 797         dep->dev = NULL;
 798         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 799         __device_free_unused(dev);
 800 }
 801
 802 void
 803 device_free_unused(struct device *dev)
 804 {
 805         struct device *tmp;
 806
 807         if (dev)
 808                 return __device_free_unused(dev);
 809
 810         avl_for_each_element_safe(&devices, dev, avl, tmp)
 811                 __device_free_unused(dev);
 812 }
 813
 814 void
 815 device_init_pending(void)
 816 {
 817         struct device *dev, *tmp;
 818
 819         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 820                 if (!dev->config_pending)
 821                         continue;
 822
 823                 dev->type->config_init(dev);
 824                 dev->config_pending = false;
 825                 device_check_state(dev);
 826         }
 827 }
 828
 829 static enum dev_change_type
 830 device_set_config(struct device *dev, struct device_type *type,
 831                   struct blob_attr *attr)
 832 {
 833         struct blob_attr *tb[__DEV_ATTR_MAX];
 834         const struct uci_blob_param_list *cfg = type->config_params;
 835
 836         if (type != dev->type)
 837                 return DEV_CONFIG_RECREATE;
 838
 839         if (dev->type->reload)
 840                 return dev->type->reload(dev, attr);
 841
 842         if (uci_blob_check_equal(dev->config, attr, cfg))
 843                 return DEV_CONFIG_NO_CHANGE;
 844
 845         if (cfg == &device_attr_list) {
 846                 memset(tb, 0, sizeof(tb));
 847
 848                 if (attr)
 849                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 850                                 blob_data(attr), blob_len(attr));
 851
 852                 device_init_settings(dev, tb);
 853                 return DEV_CONFIG_RESTART;
 854         } else
 855                 return DEV_CONFIG_RECREATE;
 856 }
 857
 858 enum dev_change_type
 859 device_apply_config(struct device *dev, struct device_type *type,
 860                     struct blob_attr *config)
 861 {
 862         enum dev_change_type change;
 863
 864         change = device_set_config(dev, type, config);
 865         if (dev->external) {
 866                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 867                 change = DEV_CONFIG_APPLIED;
 868         }
 869
 870         switch (change) {
 871                 case DEV_CONFIG_RESTART:
 872                 case DEV_CONFIG_APPLIED:
 873                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 874                         config = blob_memdup(config);
 875                         free(dev->config);
 876                         dev->config = config;
 877                         if (change == DEV_CONFIG_RESTART && dev->present) {
 878                                 int ret = 0;
 879
 880                                 device_set_present(dev, false);
 881                                 if (dev->active && !dev->external) {
 882                                         ret = dev->set_state(dev, false);
 883                                         if (!ret)
 884                                                 ret = dev->set_state(dev, true);
 885                                 }
 886                                 if (!ret)
 887                                         device_set_present(dev, true);
 888                         }
 889                         break;
 890                 case DEV_CONFIG_NO_CHANGE:
 891                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 892                         break;
 893                 case DEV_CONFIG_RECREATE:
 894                         break;
 895         }
 896
 897         return change;
 898 }
 899
 900 static void
 901 device_replace(struct device *dev, struct device *odev)
 902 {
 903         struct device_user *dep, *tmp;
 904
 905         __devlock++;
 906         if (odev->present)
 907                 device_set_present(odev, false);
 908
 909         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 910                 device_release(dep);
 911                 safe_list_del(&dep->list);
 912                 __device_add_user(dep, dev);
 913         }
 914         __devlock--;
 915
 916         device_free(odev);
 917 }
 918
 919 void
 920 device_reset_config(void)
 921 {
 922         struct device *dev;
 923
 924         avl_for_each_element(&devices, dev, avl)
 925                 dev->current_config = false;
 926 }
 927
 928 void
 929 device_reset_old(void)
 930 {
 931         struct device *dev, *tmp, *ndev;
 932
 933         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 934                 if (dev->current_config || dev->default_config)
 935                         continue;
 936
 937                 if (dev->type != &simple_device_type)
 938                         continue;
 939
 940                 ndev = device_create_default(dev->ifname, dev->external);
 941                 if (!ndev)
 942                         continue;
 943
 944                 device_replace(ndev, dev);
 945         }
 946 }
 947
 948 struct device *
 949 device_create(const char *name, struct device_type *type,
 950               struct blob_attr *config)
 951 {
 952         struct device *odev = NULL, *dev;
 953         enum dev_change_type change;
 954
 955         odev = device_find(name);
 956         if (odev) {
 957                 odev->current_config = true;
 958                 change = device_apply_config(odev, type, config);
 959                 switch (change) {
 960                 case DEV_CONFIG_RECREATE:
 961                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 962                         device_delete(odev);
 963                         break;
 964                 default:
 965                         return odev;
 966                 }
 967         } else
 968                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 969
 970         config = blob_memdup(config);
 971         if (!config)
 972                 return NULL;
 973
 974         dev = type->create(name, type, config);
 975         if (!dev)
 976                 return NULL;
 977
 978         dev->current_config = true;
 979         dev->config = config;
 980         if (odev)
 981                 device_replace(dev, odev);
 982
 983         if (!config_init && dev->config_pending) {
 984                 type->config_init(dev);
 985                 dev->config_pending = false;
 986         }
 987
 988         device_check_state(dev);
 989
 990         return dev;
 991 }
 992
 993 void
 994 device_dump_status(struct blob_buf *b, struct device *dev)
 995 {
 996         struct device_settings st;
 997         void *c, *s;
 998
 999         if (!dev) {
1000                 avl_for_each_element(&devices, dev, avl) {
1001                         if (!dev->present)
1002                                 continue;
1003                         c = blobmsg_open_table(b, dev->ifname);
1004                         device_dump_status(b, dev);
1005                         blobmsg_close_table(b, c);
1006                 }
1007
1008                 return;
1009         }
1010
1011         blobmsg_add_u8(b, "external", dev->external);
1012         blobmsg_add_u8(b, "present", dev->present);
1013         blobmsg_add_string(b, "type", dev->type->name);
1014
1015         if (!dev->present)
1016                 return;
1017
1018         blobmsg_add_u8(b, "up", !!dev->active);
1019         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1020
1021         if (dev->type->dump_info)
1022                 dev->type->dump_info(dev, b);
1023         else
1024                 system_if_dump_info(dev, b);
1025
1026         if (dev->active) {
1027                 device_merge_settings(dev, &st);
1028                 if (st.flags & DEV_OPT_MTU)
1029                         blobmsg_add_u32(b, "mtu", st.mtu);
1030                 if (st.flags & DEV_OPT_MTU6)
1031                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1032                 if (st.flags & DEV_OPT_MACADDR)
1033                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1034                 if (st.flags & DEV_OPT_TXQUEUELEN)
1035                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1036                 if (st.flags & DEV_OPT_IPV6)
1037                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1038                 if (st.flags & DEV_OPT_PROMISC)
1039                         blobmsg_add_u8(b, "promisc", st.promisc);
1040                 if (st.flags & DEV_OPT_RPFILTER)
1041                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1042                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1043                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1044                 if (st.flags & DEV_OPT_IGMPVERSION)
1045                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1046                 if (st.flags & DEV_OPT_MLDVERSION)
1047                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1048                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1049                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1050                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1051                 }
1052                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1053                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1054                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1055                 }
1056                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1057                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1058                 if (st.flags & DEV_OPT_DADTRANSMITS)
1059                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1060                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1061                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1062                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1063                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1064                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1065                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1066                 if (st.flags & DEV_OPT_MULTICAST)
1067                         blobmsg_add_u8(b, "multicast", st.multicast);
1068                 if (st.flags & DEV_OPT_LEARNING)
1069                         blobmsg_add_u8(b, "learning", st.learning);
1070                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1071                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1072                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1073                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1074         }
1075
1076         s = blobmsg_open_table(b, "statistics");
1077         if (dev->type->dump_stats)
1078                 dev->type->dump_stats(dev, b);
1079         else
1080                 system_if_dump_stats(dev, b);
1081         blobmsg_close_table(b, s);
1082 }
1083
1084 static void __init simple_device_type_init(void)
1085 {
1086         device_type_add(&simple_device_type);
1087 }