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         if (strchr(name, '.'))
 576                 return get_vlan_device_chain(name, create);
 577
 578         if (name[0] == '@')
 579                 return device_alias_get(name + 1);
 580
 581         dev = avl_find_element(&devices, name, dev, avl);
 582         if (dev) {
 583                 if (create > 1 && !dev->external) {
 584                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 585                         dev->external = true;
 586                         device_set_present(dev, true);
 587                 }
 588                 return dev;
 589         }
 590
 591         if (!create)
 592                 return NULL;
 593
 594         return device_create_default(name, create > 1);
 595 }
 596
 597 static void
 598 device_delete(struct device *dev)
 599 {
 600         if (!dev->avl.key)
 601                 return;
 602
 603         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 604         avl_delete(&devices, &dev->avl);
 605         dev->avl.key = NULL;
 606 }
 607
 608 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 609 {
 610         struct device_user *dep = container_of(list, struct device_user, list);
 611         if (dep->cb)
 612                 dep->cb(dep, DEV_EVENT_REMOVE);
 613
 614         device_release(dep);
 615         return 0;
 616 }
 617
 618 void device_cleanup(struct device *dev)
 619 {
 620         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 621         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 622         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 623         device_delete(dev);
 624 }
 625
 626 static void __device_set_present(struct device *dev, bool state)
 627 {
 628         if (dev->present == state)
 629                 return;
 630
 631         dev->present = state;
 632         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 633 }
 634
 635 void
 636 device_refresh_present(struct device *dev)
 637 {
 638         bool state = dev->sys_present;
 639
 640         if (dev->disabled || dev->deferred)
 641                 state = false;
 642
 643         __device_set_present(dev, state);
 644 }
 645
 646 void device_set_present(struct device *dev, bool state)
 647 {
 648         if (dev->sys_present == state)
 649                 return;
 650
 651         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 652         dev->sys_present = state;
 653         device_refresh_present(dev);
 654 }
 655
 656 void device_set_link(struct device *dev, bool state)
 657 {
 658         if (dev->link_active == state)
 659                 return;
 660
 661         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 662
 663         dev->link_active = state;
 664         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 665 }
 666
 667 void device_set_ifindex(struct device *dev, int ifindex)
 668 {
 669         if (dev->ifindex == ifindex)
 670                 return;
 671
 672         dev->ifindex = ifindex;
 673         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 674 }
 675
 676 int device_set_ifname(struct device *dev, const char *name)
 677 {
 678         int ret = 0;
 679
 680         if (!strcmp(dev->ifname, name))
 681                 return 0;
 682
 683         if (strlen(name) > sizeof(dev->ifname) - 1)
 684                 return -1;
 685
 686         if (dev->avl.key)
 687                 avl_delete(&devices, &dev->avl);
 688
 689         strcpy(dev->ifname, name);
 690
 691         if (dev->avl.key)
 692                 ret = avl_insert(&devices, &dev->avl);
 693
 694         if (ret == 0)
 695                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 696
 697         return ret;
 698 }
 699
 700 static int device_refcount(struct device *dev)
 701 {
 702         struct list_head *list;
 703         int count = 0;
 704
 705         list_for_each(list, &dev->users.list)
 706                 count++;
 707
 708         list_for_each(list, &dev->aliases.list)
 709                 count++;
 710
 711         return count;
 712 }
 713
 714 static void
 715 __device_add_user(struct device_user *dep, struct device *dev)
 716 {
 717         struct safe_list *head;
 718
 719         dep->dev = dev;
 720
 721         if (dep->alias)
 722                 head = &dev->aliases;
 723         else
 724                 head = &dev->users;
 725
 726         safe_list_add(&dep->list, head);
 727         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 728
 729         if (dep->cb && dev->present) {
 730                 dep->cb(dep, DEV_EVENT_ADD);
 731                 if (dev->active)
 732                         dep->cb(dep, DEV_EVENT_UP);
 733
 734                 if (dev->link_active)
 735                         dep->cb(dep, DEV_EVENT_LINK_UP);
 736         }
 737 }
 738
 739 void device_add_user(struct device_user *dep, struct device *dev)
 740 {
 741         if (dep->dev == dev)
 742                 return;
 743
 744         if (dep->dev)
 745                 device_remove_user(dep);
 746
 747         if (!dev)
 748                 return;
 749
 750         __device_add_user(dep, dev);
 751 }
 752
 753 static void
 754 device_free(struct device *dev)
 755 {
 756         __devlock++;
 757         free(dev->config);
 758         device_cleanup(dev);
 759         dev->type->free(dev);
 760         __devlock--;
 761 }
 762
 763 static void
 764 __device_free_unused(struct device *dev)
 765 {
 766         if (!safe_list_empty(&dev->users) ||
 767                 !safe_list_empty(&dev->aliases) ||
 768             dev->current_config || __devlock)
 769                 return;
 770
 771         device_free(dev);
 772 }
 773
 774 void device_remove_user(struct device_user *dep)
 775 {
 776         struct device *dev = dep->dev;
 777
 778         if (!dep->dev)
 779                 return;
 780
 781         dep->hotplug = false;
 782         if (dep->claimed)
 783                 device_release(dep);
 784
 785         safe_list_del(&dep->list);
 786         dep->dev = NULL;
 787         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 788         __device_free_unused(dev);
 789 }
 790
 791 void
 792 device_free_unused(struct device *dev)
 793 {
 794         struct device *tmp;
 795
 796         if (dev)
 797                 return __device_free_unused(dev);
 798
 799         avl_for_each_element_safe(&devices, dev, avl, tmp)
 800                 __device_free_unused(dev);
 801 }
 802
 803 void
 804 device_init_pending(void)
 805 {
 806         struct device *dev, *tmp;
 807
 808         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 809                 if (!dev->config_pending)
 810                         continue;
 811
 812                 dev->type->config_init(dev);
 813                 dev->config_pending = false;
 814                 device_check_state(dev);
 815         }
 816 }
 817
 818 static enum dev_change_type
 819 device_set_config(struct device *dev, struct device_type *type,
 820                   struct blob_attr *attr)
 821 {
 822         struct blob_attr *tb[__DEV_ATTR_MAX];
 823         const struct uci_blob_param_list *cfg = type->config_params;
 824
 825         if (type != dev->type)
 826                 return DEV_CONFIG_RECREATE;
 827
 828         if (dev->type->reload)
 829                 return dev->type->reload(dev, attr);
 830
 831         if (uci_blob_check_equal(dev->config, attr, cfg))
 832                 return DEV_CONFIG_NO_CHANGE;
 833
 834         if (cfg == &device_attr_list) {
 835                 memset(tb, 0, sizeof(tb));
 836
 837                 if (attr)
 838                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 839                                 blob_data(attr), blob_len(attr));
 840
 841                 device_init_settings(dev, tb);
 842                 return DEV_CONFIG_RESTART;
 843         } else
 844                 return DEV_CONFIG_RECREATE;
 845 }
 846
 847 enum dev_change_type
 848 device_apply_config(struct device *dev, struct device_type *type,
 849                     struct blob_attr *config)
 850 {
 851         enum dev_change_type change;
 852
 853         change = device_set_config(dev, type, config);
 854         if (dev->external) {
 855                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 856                 change = DEV_CONFIG_APPLIED;
 857         }
 858
 859         switch (change) {
 860                 case DEV_CONFIG_RESTART:
 861                 case DEV_CONFIG_APPLIED:
 862                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 863                         config = blob_memdup(config);
 864                         free(dev->config);
 865                         dev->config = config;
 866                         if (change == DEV_CONFIG_RESTART && dev->present) {
 867                                 int ret = 0;
 868
 869                                 device_set_present(dev, false);
 870                                 if (dev->active && !dev->external) {
 871                                         ret = dev->set_state(dev, false);
 872                                         if (!ret)
 873                                                 ret = dev->set_state(dev, true);
 874                                 }
 875                                 if (!ret)
 876                                         device_set_present(dev, true);
 877                         }
 878                         break;
 879                 case DEV_CONFIG_NO_CHANGE:
 880                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 881                         break;
 882                 case DEV_CONFIG_RECREATE:
 883                         break;
 884         }
 885
 886         return change;
 887 }
 888
 889 static void
 890 device_replace(struct device *dev, struct device *odev)
 891 {
 892         struct device_user *dep, *tmp;
 893
 894         __devlock++;
 895         if (odev->present)
 896                 device_set_present(odev, false);
 897
 898         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 899                 device_release(dep);
 900                 safe_list_del(&dep->list);
 901                 __device_add_user(dep, dev);
 902         }
 903         __devlock--;
 904
 905         device_free(odev);
 906 }
 907
 908 void
 909 device_reset_config(void)
 910 {
 911         struct device *dev;
 912
 913         avl_for_each_element(&devices, dev, avl)
 914                 dev->current_config = false;
 915 }
 916
 917 void
 918 device_reset_old(void)
 919 {
 920         struct device *dev, *tmp, *ndev;
 921
 922         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 923                 if (dev->current_config || dev->default_config)
 924                         continue;
 925
 926                 if (dev->type != &simple_device_type)
 927                         continue;
 928
 929                 ndev = device_create_default(dev->ifname, dev->external);
 930                 if (!ndev)
 931                         continue;
 932
 933                 device_replace(ndev, dev);
 934         }
 935 }
 936
 937 struct device *
 938 device_create(const char *name, struct device_type *type,
 939               struct blob_attr *config)
 940 {
 941         struct device *odev = NULL, *dev;
 942         enum dev_change_type change;
 943
 944         odev = device_find(name);
 945         if (odev) {
 946                 odev->current_config = true;
 947                 change = device_apply_config(odev, type, config);
 948                 switch (change) {
 949                 case DEV_CONFIG_RECREATE:
 950                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 951                         device_delete(odev);
 952                         break;
 953                 default:
 954                         return odev;
 955                 }
 956         } else
 957                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 958
 959         config = blob_memdup(config);
 960         if (!config)
 961                 return NULL;
 962
 963         dev = type->create(name, type, config);
 964         if (!dev)
 965                 return NULL;
 966
 967         dev->current_config = true;
 968         dev->config = config;
 969         if (odev)
 970                 device_replace(dev, odev);
 971
 972         if (!config_init && dev->config_pending) {
 973                 type->config_init(dev);
 974                 dev->config_pending = false;
 975         }
 976
 977         device_check_state(dev);
 978
 979         return dev;
 980 }
 981
 982 void
 983 device_dump_status(struct blob_buf *b, struct device *dev)
 984 {
 985         struct device_settings st;
 986         void *c, *s;
 987
 988         if (!dev) {
 989                 avl_for_each_element(&devices, dev, avl) {
 990                         if (!dev->present)
 991                                 continue;
 992                         c = blobmsg_open_table(b, dev->ifname);
 993                         device_dump_status(b, dev);
 994                         blobmsg_close_table(b, c);
 995                 }
 996
 997                 return;
 998         }
 999
1000         blobmsg_add_u8(b, "external", dev->external);
1001         blobmsg_add_u8(b, "present", dev->present);
1002         blobmsg_add_string(b, "type", dev->type->name);
1003
1004         if (!dev->present)
1005                 return;
1006
1007         blobmsg_add_u8(b, "up", !!dev->active);
1008         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1009
1010         if (dev->type->dump_info)
1011                 dev->type->dump_info(dev, b);
1012         else
1013                 system_if_dump_info(dev, b);
1014
1015         if (dev->active) {
1016                 device_merge_settings(dev, &st);
1017                 if (st.flags & DEV_OPT_MTU)
1018                         blobmsg_add_u32(b, "mtu", st.mtu);
1019                 if (st.flags & DEV_OPT_MTU6)
1020                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1021                 if (st.flags & DEV_OPT_MACADDR)
1022                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1023                 if (st.flags & DEV_OPT_TXQUEUELEN)
1024                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1025                 if (st.flags & DEV_OPT_IPV6)
1026                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1027                 if (st.flags & DEV_OPT_PROMISC)
1028                         blobmsg_add_u8(b, "promisc", st.promisc);
1029                 if (st.flags & DEV_OPT_RPFILTER)
1030                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1031                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1032                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1033                 if (st.flags & DEV_OPT_IGMPVERSION)
1034                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1035                 if (st.flags & DEV_OPT_MLDVERSION)
1036                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1037                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1038                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1039                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1040                 }
1041                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1042                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1043                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1044                 }
1045                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1046                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1047                 if (st.flags & DEV_OPT_DADTRANSMITS)
1048                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1049                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1050                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1051                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1052                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1053                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1054                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1055                 if (st.flags & DEV_OPT_MULTICAST)
1056                         blobmsg_add_u8(b, "multicast", st.multicast);
1057                 if (st.flags & DEV_OPT_LEARNING)
1058                         blobmsg_add_u8(b, "learning", st.learning);
1059                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1060                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1061                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1062                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1063         }
1064
1065         s = blobmsg_open_table(b, "statistics");
1066         if (dev->type->dump_stats)
1067                 dev->type->dump_stats(dev, b);
1068         else
1069                 system_if_dump_stats(dev, b);
1070         blobmsg_close_table(b, s);
1071 }
1072
1073 static void __init simple_device_type_init(void)
1074 {
1075         device_type_add(&simple_device_type);
1076 }