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