bridge.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 #include <errno.h>
  19
  20 #include "netifd.h"
  21 #include "device.h"
  22 #include "interface.h"
  23 #include "system.h"
  24
  25 enum {
  26         BRIDGE_ATTR_IFNAME,
  27         BRIDGE_ATTR_STP,
  28         BRIDGE_ATTR_FORWARD_DELAY,
  29         BRIDGE_ATTR_PRIORITY,
  30         BRIDGE_ATTR_IGMP_SNOOP,
  31         BRIDGE_ATTR_AGEING_TIME,
  32         BRIDGE_ATTR_HELLO_TIME,
  33         BRIDGE_ATTR_MAX_AGE,
  34         BRIDGE_ATTR_BRIDGE_EMPTY,
  35         BRIDGE_ATTR_MULTICAST_QUERIER,
  36         BRIDGE_ATTR_HASH_MAX,
  37         BRIDGE_ATTR_ROBUSTNESS,
  38         BRIDGE_ATTR_QUERY_INTERVAL,
  39         BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL,
  40         BRIDGE_ATTR_LAST_MEMBER_INTERVAL,
  41         __BRIDGE_ATTR_MAX
  42 };
  43
  44 static const struct blobmsg_policy bridge_attrs[__BRIDGE_ATTR_MAX] = {
  45         [BRIDGE_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  46         [BRIDGE_ATTR_STP] = { "stp", BLOBMSG_TYPE_BOOL },
  47         [BRIDGE_ATTR_FORWARD_DELAY] = { "forward_delay", BLOBMSG_TYPE_INT32 },
  48         [BRIDGE_ATTR_PRIORITY] = { "priority", BLOBMSG_TYPE_INT32 },
  49         [BRIDGE_ATTR_AGEING_TIME] = { "ageing_time", BLOBMSG_TYPE_INT32 },
  50         [BRIDGE_ATTR_HELLO_TIME] = { "hello_time", BLOBMSG_TYPE_INT32 },
  51         [BRIDGE_ATTR_MAX_AGE] = { "max_age", BLOBMSG_TYPE_INT32 },
  52         [BRIDGE_ATTR_IGMP_SNOOP] = { "igmp_snooping", BLOBMSG_TYPE_BOOL },
  53         [BRIDGE_ATTR_BRIDGE_EMPTY] = { "bridge_empty", BLOBMSG_TYPE_BOOL },
  54         [BRIDGE_ATTR_MULTICAST_QUERIER] = { "multicast_querier", BLOBMSG_TYPE_BOOL },
  55         [BRIDGE_ATTR_HASH_MAX] = { "hash_max", BLOBMSG_TYPE_INT32 },
  56         [BRIDGE_ATTR_ROBUSTNESS] = { "robustness", BLOBMSG_TYPE_INT32 },
  57         [BRIDGE_ATTR_QUERY_INTERVAL] = { "query_interval", BLOBMSG_TYPE_INT32 },
  58         [BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL] = { "query_response_interval", BLOBMSG_TYPE_INT32 },
  59         [BRIDGE_ATTR_LAST_MEMBER_INTERVAL] = { "last_member_interval", BLOBMSG_TYPE_INT32 },
  60 };
  61
  62 static const struct uci_blob_param_info bridge_attr_info[__BRIDGE_ATTR_MAX] = {
  63         [BRIDGE_ATTR_IFNAME] = { .type = BLOBMSG_TYPE_STRING },
  64 };
  65
  66 static const struct uci_blob_param_list bridge_attr_list = {
  67         .n_params = __BRIDGE_ATTR_MAX,
  68         .params = bridge_attrs,
  69         .info = bridge_attr_info,
  70
  71         .n_next = 1,
  72         .next = { &device_attr_list },
  73 };
  74
  75 static struct device *bridge_create(const char *name, struct device_type *devtype,
  76         struct blob_attr *attr);
  77 static void bridge_config_init(struct device *dev);
  78 static void bridge_free(struct device *dev);
  79 static void bridge_dump_info(struct device *dev, struct blob_buf *b);
  80 enum dev_change_type
  81 bridge_reload(struct device *dev, struct blob_attr *attr);
  82
  83 static struct device_type bridge_device_type = {
  84         .name = "bridge",
  85         .config_params = &bridge_attr_list,
  86
  87         .bridge_capability = true,
  88         .name_prefix = "br",
  89
  90         .create = bridge_create,
  91         .config_init = bridge_config_init,
  92         .reload = bridge_reload,
  93         .free = bridge_free,
  94         .dump_info = bridge_dump_info,
  95 };
  96
  97 struct bridge_state {
  98         struct device dev;
  99         device_state_cb set_state;
 100
 101         struct blob_attr *config_data;
 102         struct bridge_config config;
 103         struct blob_attr *ifnames;
 104         bool active;
 105         bool force_active;
 106
 107         struct uloop_timeout retry;
 108         struct bridge_member *primary_port;
 109         struct vlist_tree members;
 110         int n_present;
 111         int n_failed;
 112 };
 113
 114 struct bridge_member {
 115         struct vlist_node node;
 116         struct bridge_state *bst;
 117         struct device_user dev;
 118         bool present;
 119         char name[];
 120 };
 121
 122 static void
 123 bridge_reset_primary(struct bridge_state *bst)
 124 {
 125         struct bridge_member *bm;
 126
 127         if (!bst->primary_port &&
 128             (bst->dev.settings.flags & DEV_OPT_MACADDR))
 129                 return;
 130
 131         bst->primary_port = NULL;
 132         bst->dev.settings.flags &= ~DEV_OPT_MACADDR;
 133         vlist_for_each_element(&bst->members, bm, node) {
 134                 uint8_t *macaddr;
 135
 136                 if (!bm->present)
 137                         continue;
 138
 139                 bst->primary_port = bm;
 140                 if (bm->dev.dev->settings.flags & DEV_OPT_MACADDR)
 141                         macaddr = bm->dev.dev->settings.macaddr;
 142                 else
 143                         macaddr = bm->dev.dev->orig_settings.macaddr;
 144                 memcpy(bst->dev.settings.macaddr, macaddr, 6);
 145                 bst->dev.settings.flags |= DEV_OPT_MACADDR;
 146                 return;
 147         }
 148 }
 149
 150 static int
 151 bridge_disable_member(struct bridge_member *bm)
 152 {
 153         struct bridge_state *bst = bm->bst;
 154
 155         if (!bm->present)
 156                 return 0;
 157
 158         system_bridge_delif(&bst->dev, bm->dev.dev);
 159         device_release(&bm->dev);
 160
 161         device_broadcast_event(&bst->dev, DEV_EVENT_TOPO_CHANGE);
 162
 163         return 0;
 164 }
 165
 166 static int
 167 bridge_enable_interface(struct bridge_state *bst)
 168 {
 169         int ret;
 170
 171         if (bst->active)
 172                 return 0;
 173
 174         ret = system_bridge_addbr(&bst->dev, &bst->config);
 175         if (ret < 0)
 176                 return ret;
 177
 178         bst->active = true;
 179         return 0;
 180 }
 181
 182 static void
 183 bridge_disable_interface(struct bridge_state *bst)
 184 {
 185         if (!bst->active)
 186                 return;
 187
 188         system_bridge_delbr(&bst->dev);
 189         bst->active = false;
 190 }
 191
 192 static int
 193 bridge_enable_member(struct bridge_member *bm)
 194 {
 195         struct bridge_state *bst = bm->bst;
 196         int ret;
 197
 198         if (!bm->present)
 199                 return 0;
 200
 201         ret = bridge_enable_interface(bst);
 202         if (ret)
 203                 goto error;
 204
 205         /* Disable IPv6 for bridge members */
 206         if (!(bm->dev.dev->settings.flags & DEV_OPT_IPV6)) {
 207                 bm->dev.dev->settings.ipv6 = 0;
 208                 bm->dev.dev->settings.flags |= DEV_OPT_IPV6;
 209         }
 210
 211         ret = device_claim(&bm->dev);
 212         if (ret < 0)
 213                 goto error;
 214
 215         ret = system_bridge_addif(&bst->dev, bm->dev.dev);
 216         if (ret < 0) {
 217                 D(DEVICE, "Bridge device %s could not be added\n", bm->dev.dev->ifname);
 218                 goto error;
 219         }
 220
 221         device_set_present(&bst->dev, true);
 222         device_broadcast_event(&bst->dev, DEV_EVENT_TOPO_CHANGE);
 223
 224         return 0;
 225
 226 error:
 227         bst->n_failed++;
 228         bm->present = false;
 229         bst->n_present--;
 230         device_release(&bm->dev);
 231
 232         return ret;
 233 }
 234
 235 static void
 236 bridge_remove_member(struct bridge_member *bm)
 237 {
 238         struct bridge_state *bst = bm->bst;
 239
 240         if (!bm->present)
 241                 return;
 242
 243         if (bst->dev.active)
 244                 bridge_disable_member(bm);
 245
 246         bm->present = false;
 247         bm->bst->n_present--;
 248
 249         if (bm == bst->primary_port)
 250                 bridge_reset_primary(bst);
 251
 252         if (bst->config.bridge_empty)
 253                 return;
 254
 255         bst->force_active = false;
 256         if (bst->n_present == 0)
 257                 device_set_present(&bst->dev, false);
 258 }
 259
 260 static void
 261 bridge_free_member(struct bridge_member *bm)
 262 {
 263         struct device *dev = bm->dev.dev;
 264
 265         bridge_remove_member(bm);
 266         device_remove_user(&bm->dev);
 267
 268         /*
 269          * When reloading the config and moving a device from one bridge to
 270          * another, the other bridge may have tried to claim this device
 271          * before it was removed here.
 272          * Ensure that claiming the device is retried by toggling its present
 273          * state
 274          */
 275         if (dev->present) {
 276                 device_set_present(dev, false);
 277                 device_set_present(dev, true);
 278         }
 279
 280         free(bm);
 281 }
 282
 283 static void
 284 bridge_check_retry(struct bridge_state *bst)
 285 {
 286         if (!bst->n_failed)
 287                 return;
 288
 289         uloop_timeout_set(&bst->retry, 100);
 290 }
 291
 292 static void
 293 bridge_member_cb(struct device_user *dev, enum device_event ev)
 294 {
 295         struct bridge_member *bm = container_of(dev, struct bridge_member, dev);
 296         struct bridge_state *bst = bm->bst;
 297
 298         switch (ev) {
 299         case DEV_EVENT_ADD:
 300                 assert(!bm->present);
 301
 302                 bm->present = true;
 303                 bst->n_present++;
 304
 305                 if (bst->n_present == 1)
 306                         device_set_present(&bst->dev, true);
 307                 if (bst->dev.active && !bridge_enable_member(bm)) {
 308                         /*
 309                          * Adding a bridge member can overwrite the bridge mtu
 310                          * in the kernel, apply the bridge settings in case the
 311                          * bridge mtu is set
 312                          */
 313                         system_if_apply_settings(&bst->dev, &bst->dev.settings,
 314                                                  DEV_OPT_MTU | DEV_OPT_MTU6);
 315                 }
 316
 317                 break;
 318         case DEV_EVENT_REMOVE:
 319                 if (dev->hotplug) {
 320                         vlist_delete(&bst->members, &bm->node);
 321                         return;
 322                 }
 323
 324                 if (bm->present)
 325                         bridge_remove_member(bm);
 326
 327                 break;
 328         default:
 329                 return;
 330         }
 331 }
 332
 333 static int
 334 bridge_set_down(struct bridge_state *bst)
 335 {
 336         struct bridge_member *bm;
 337
 338         bst->set_state(&bst->dev, false);
 339
 340         vlist_for_each_element(&bst->members, bm, node)
 341                 bridge_disable_member(bm);
 342
 343         bridge_disable_interface(bst);
 344
 345         return 0;
 346 }
 347
 348 static int
 349 bridge_set_up(struct bridge_state *bst)
 350 {
 351         struct bridge_member *bm;
 352         int ret;
 353
 354         if (!bst->n_present) {
 355                 if (!bst->force_active)
 356                         return -ENOENT;
 357
 358                 ret = bridge_enable_interface(bst);
 359                 if (ret)
 360                         return ret;
 361         }
 362
 363         bst->n_failed = 0;
 364         vlist_for_each_element(&bst->members, bm, node)
 365                 bridge_enable_member(bm);
 366         bridge_check_retry(bst);
 367
 368         if (!bst->force_active && !bst->n_present) {
 369                 /* initialization of all member interfaces failed */
 370                 bridge_disable_interface(bst);
 371                 device_set_present(&bst->dev, false);
 372                 return -ENOENT;
 373         }
 374
 375         bridge_reset_primary(bst);
 376         ret = bst->set_state(&bst->dev, true);
 377         if (ret < 0)
 378                 bridge_set_down(bst);
 379
 380         return ret;
 381 }
 382
 383 static int
 384 bridge_set_state(struct device *dev, bool up)
 385 {
 386         struct bridge_state *bst;
 387
 388         bst = container_of(dev, struct bridge_state, dev);
 389
 390         if (up)
 391                 return bridge_set_up(bst);
 392         else
 393                 return bridge_set_down(bst);
 394 }
 395
 396 static struct bridge_member *
 397 bridge_create_member(struct bridge_state *bst, const char *name,
 398                      struct device *dev, bool hotplug)
 399 {
 400         struct bridge_member *bm;
 401
 402         bm = calloc(1, sizeof(*bm) + strlen(name) + 1);
 403         if (!bm)
 404                 return NULL;
 405
 406         bm->bst = bst;
 407         bm->dev.cb = bridge_member_cb;
 408         bm->dev.hotplug = hotplug;
 409         strcpy(bm->name, name);
 410         bm->dev.dev = dev;
 411         vlist_add(&bst->members, &bm->node, bm->name);
 412         // Need to look up the bridge member again as the above
 413         // created pointer will be freed in case the bridge member
 414         // already existed
 415         bm = vlist_find(&bst->members, name, bm, node);
 416         if (hotplug && bm)
 417                 bm->node.version = -1;
 418
 419         return bm;
 420 }
 421
 422 static void
 423 bridge_member_update(struct vlist_tree *tree, struct vlist_node *node_new,
 424                      struct vlist_node *node_old)
 425 {
 426         struct bridge_member *bm;
 427         struct device *dev;
 428
 429         if (node_new) {
 430                 bm = container_of(node_new, struct bridge_member, node);
 431
 432                 if (node_old) {
 433                         free(bm);
 434                         return;
 435                 }
 436
 437                 dev = bm->dev.dev;
 438                 bm->dev.dev = NULL;
 439                 device_add_user(&bm->dev, dev);
 440         }
 441
 442
 443         if (node_old) {
 444                 bm = container_of(node_old, struct bridge_member, node);
 445                 bridge_free_member(bm);
 446         }
 447 }
 448
 449
 450 static void
 451 bridge_add_member(struct bridge_state *bst, const char *name)
 452 {
 453         struct device *dev;
 454
 455         dev = device_get(name, true);
 456         if (!dev)
 457                 return;
 458
 459         bridge_create_member(bst, name, dev, false);
 460 }
 461
 462 static int
 463 bridge_hotplug_add(struct device *dev, struct device *member)
 464 {
 465         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 466
 467         bridge_create_member(bst, member->ifname, member, true);
 468
 469         return 0;
 470 }
 471
 472 static int
 473 bridge_hotplug_del(struct device *dev, struct device *member)
 474 {
 475         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 476         struct bridge_member *bm;
 477
 478         bm = vlist_find(&bst->members, member->ifname, bm, node);
 479         if (!bm)
 480                 return UBUS_STATUS_NOT_FOUND;
 481
 482         vlist_delete(&bst->members, &bm->node);
 483         return 0;
 484 }
 485
 486 static int
 487 bridge_hotplug_prepare(struct device *dev)
 488 {
 489         struct bridge_state *bst;
 490
 491         bst = container_of(dev, struct bridge_state, dev);
 492         bst->force_active = true;
 493         device_set_present(&bst->dev, true);
 494
 495         return 0;
 496 }
 497
 498 static const struct device_hotplug_ops bridge_ops = {
 499         .prepare = bridge_hotplug_prepare,
 500         .add = bridge_hotplug_add,
 501         .del = bridge_hotplug_del
 502 };
 503
 504 static void
 505 bridge_free(struct device *dev)
 506 {
 507         struct bridge_state *bst;
 508
 509         bst = container_of(dev, struct bridge_state, dev);
 510         vlist_flush_all(&bst->members);
 511         free(bst->config_data);
 512         free(bst);
 513 }
 514
 515 static void
 516 bridge_dump_info(struct device *dev, struct blob_buf *b)
 517 {
 518         struct bridge_state *bst;
 519         struct bridge_member *bm;
 520         void *list;
 521
 522         bst = container_of(dev, struct bridge_state, dev);
 523
 524         system_if_dump_info(dev, b);
 525         list = blobmsg_open_array(b, "bridge-members");
 526
 527         vlist_for_each_element(&bst->members, bm, node) {
 528                 if (bm->dev.dev->hidden)
 529                         continue;
 530
 531                 blobmsg_add_string(b, NULL, bm->dev.dev->ifname);
 532         }
 533
 534         blobmsg_close_array(b, list);
 535 }
 536
 537 static void
 538 bridge_config_init(struct device *dev)
 539 {
 540         struct bridge_state *bst;
 541         struct blob_attr *cur;
 542         int rem;
 543
 544         bst = container_of(dev, struct bridge_state, dev);
 545
 546         if (bst->config.bridge_empty) {
 547                 bst->force_active = true;
 548                 device_set_present(&bst->dev, true);
 549         }
 550
 551         bst->n_failed = 0;
 552         vlist_update(&bst->members);
 553         if (bst->ifnames) {
 554                 blobmsg_for_each_attr(cur, bst->ifnames, rem) {
 555                         bridge_add_member(bst, blobmsg_data(cur));
 556                 }
 557         }
 558         vlist_flush(&bst->members);
 559         bridge_check_retry(bst);
 560 }
 561
 562 static void
 563 bridge_apply_settings(struct bridge_state *bst, struct blob_attr **tb)
 564 {
 565         struct bridge_config *cfg = &bst->config;
 566         struct blob_attr *cur;
 567
 568         /* defaults */
 569         cfg->stp = false;
 570         cfg->forward_delay = 2;
 571         cfg->robustness = 2;
 572         cfg->query_interval = 12500;
 573         cfg->query_response_interval = 1000;
 574         cfg->last_member_interval = 100;
 575         cfg->hash_max = 512;
 576         cfg->bridge_empty = false;
 577         cfg->priority = 0x7FFF;
 578
 579         if ((cur = tb[BRIDGE_ATTR_STP]))
 580                 cfg->stp = blobmsg_get_bool(cur);
 581
 582         if ((cur = tb[BRIDGE_ATTR_FORWARD_DELAY]))
 583                 cfg->forward_delay = blobmsg_get_u32(cur);
 584
 585         if ((cur = tb[BRIDGE_ATTR_PRIORITY]))
 586                 cfg->priority = blobmsg_get_u32(cur);
 587
 588         if ((cur = tb[BRIDGE_ATTR_IGMP_SNOOP]))
 589                 cfg->multicast_querier = cfg->igmp_snoop = blobmsg_get_bool(cur);
 590
 591         if ((cur = tb[BRIDGE_ATTR_MULTICAST_QUERIER]))
 592                 cfg->multicast_querier = blobmsg_get_bool(cur);
 593
 594         if ((cur = tb[BRIDGE_ATTR_HASH_MAX]))
 595                 cfg->hash_max = blobmsg_get_u32(cur);
 596
 597         if ((cur = tb[BRIDGE_ATTR_ROBUSTNESS])) {
 598                 cfg->robustness = blobmsg_get_u32(cur);
 599                 cfg->flags |= BRIDGE_OPT_ROBUSTNESS;
 600         }
 601
 602         if ((cur = tb[BRIDGE_ATTR_QUERY_INTERVAL])) {
 603                 cfg->query_interval = blobmsg_get_u32(cur);
 604                 cfg->flags |= BRIDGE_OPT_QUERY_INTERVAL;
 605         }
 606
 607         if ((cur = tb[BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL])) {
 608                 cfg->query_response_interval = blobmsg_get_u32(cur);
 609                 cfg->flags |= BRIDGE_OPT_QUERY_RESPONSE_INTERVAL;
 610         }
 611
 612         if ((cur = tb[BRIDGE_ATTR_LAST_MEMBER_INTERVAL])) {
 613                 cfg->last_member_interval = blobmsg_get_u32(cur);
 614                 cfg->flags |= BRIDGE_OPT_LAST_MEMBER_INTERVAL;
 615         }
 616
 617         if ((cur = tb[BRIDGE_ATTR_AGEING_TIME])) {
 618                 cfg->ageing_time = blobmsg_get_u32(cur);
 619                 cfg->flags |= BRIDGE_OPT_AGEING_TIME;
 620         }
 621
 622         if ((cur = tb[BRIDGE_ATTR_HELLO_TIME])) {
 623                 cfg->hello_time = blobmsg_get_u32(cur);
 624                 cfg->flags |= BRIDGE_OPT_HELLO_TIME;
 625         }
 626
 627         if ((cur = tb[BRIDGE_ATTR_MAX_AGE])) {
 628                 cfg->max_age = blobmsg_get_u32(cur);
 629                 cfg->flags |= BRIDGE_OPT_MAX_AGE;
 630         }
 631
 632         if ((cur = tb[BRIDGE_ATTR_BRIDGE_EMPTY]))
 633                 cfg->bridge_empty = blobmsg_get_bool(cur);
 634 }
 635
 636 enum dev_change_type
 637 bridge_reload(struct device *dev, struct blob_attr *attr)
 638 {
 639         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 640         struct blob_attr *tb_br[__BRIDGE_ATTR_MAX];
 641         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 642         unsigned long diff;
 643         struct bridge_state *bst;
 644
 645         BUILD_BUG_ON(sizeof(diff) < __BRIDGE_ATTR_MAX / 8);
 646         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
 647
 648         bst = container_of(dev, struct bridge_state, dev);
 649         attr = blob_memdup(attr);
 650
 651         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 652                 blob_data(attr), blob_len(attr));
 653         blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, tb_br,
 654                 blob_data(attr), blob_len(attr));
 655
 656         if (tb_dev[DEV_ATTR_MACADDR])
 657                 bst->primary_port = NULL;
 658
 659         bst->ifnames = tb_br[BRIDGE_ATTR_IFNAME];
 660         device_init_settings(dev, tb_dev);
 661         bridge_apply_settings(bst, tb_br);
 662
 663         if (bst->config_data) {
 664                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 665                 struct blob_attr *otb_br[__BRIDGE_ATTR_MAX];
 666
 667                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 668                         blob_data(bst->config_data), blob_len(bst->config_data));
 669
 670                 diff = 0;
 671                 uci_blob_diff(tb_dev, otb_dev, &device_attr_list, &diff);
 672                 if (diff)
 673                     ret = DEV_CONFIG_RESTART;
 674
 675                 blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, otb_br,
 676                         blob_data(bst->config_data), blob_len(bst->config_data));
 677
 678                 diff = 0;
 679                 uci_blob_diff(tb_br, otb_br, &bridge_attr_list, &diff);
 680                 if (diff & ~(1 << BRIDGE_ATTR_IFNAME))
 681                     ret = DEV_CONFIG_RESTART;
 682
 683                 bridge_config_init(dev);
 684         }
 685
 686         free(bst->config_data);
 687         bst->config_data = attr;
 688         return ret;
 689 }
 690
 691 static void
 692 bridge_retry_members(struct uloop_timeout *timeout)
 693 {
 694         struct bridge_state *bst = container_of(timeout, struct bridge_state, retry);
 695         struct bridge_member *bm;
 696
 697         bst->n_failed = 0;
 698         vlist_for_each_element(&bst->members, bm, node) {
 699                 if (bm->present)
 700                         continue;
 701
 702                 if (!bm->dev.dev->present)
 703                         continue;
 704
 705                 bm->present = true;
 706                 bst->n_present++;
 707                 bridge_enable_member(bm);
 708         }
 709 }
 710
 711 static struct device *
 712 bridge_create(const char *name, struct device_type *devtype,
 713         struct blob_attr *attr)
 714 {
 715         struct bridge_state *bst;
 716         struct device *dev = NULL;
 717
 718         bst = calloc(1, sizeof(*bst));
 719         if (!bst)
 720                 return NULL;
 721
 722         dev = &bst->dev;
 723         device_init(dev, devtype, name);
 724         dev->config_pending = true;
 725         bst->retry.cb = bridge_retry_members;
 726
 727         bst->set_state = dev->set_state;
 728         dev->set_state = bridge_set_state;
 729
 730         dev->hotplug_ops = &bridge_ops;
 731
 732         vlist_init(&bst->members, avl_strcmp, bridge_member_update);
 733         bst->members.keep_old = true;
 734         bridge_reload(dev, attr);
 735
 736         return dev;
 737 }
 738
 739 static void __init bridge_device_type_init(void)
 740 {
 741         device_type_add(&bridge_device_type);
 742 }