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 #include "ubus.h"
  25
  26 enum {
  27         BRIDGE_ATTR_PORTS,
  28         BRIDGE_ATTR_STP,
  29         BRIDGE_ATTR_FORWARD_DELAY,
  30         BRIDGE_ATTR_PRIORITY,
  31         BRIDGE_ATTR_IGMP_SNOOP,
  32         BRIDGE_ATTR_AGEING_TIME,
  33         BRIDGE_ATTR_HELLO_TIME,
  34         BRIDGE_ATTR_MAX_AGE,
  35         BRIDGE_ATTR_BRIDGE_EMPTY,
  36         BRIDGE_ATTR_MULTICAST_QUERIER,
  37         BRIDGE_ATTR_HASH_MAX,
  38         BRIDGE_ATTR_ROBUSTNESS,
  39         BRIDGE_ATTR_QUERY_INTERVAL,
  40         BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL,
  41         BRIDGE_ATTR_LAST_MEMBER_INTERVAL,
  42         BRIDGE_ATTR_VLAN_FILTERING,
  43         BRIDGE_ATTR_HAS_VLANS,
  44         BRIDGE_ATTR_STP_KERNEL,
  45         BRIDGE_ATTR_STP_PROTO,
  46         __BRIDGE_ATTR_MAX
  47 };
  48
  49 static const struct blobmsg_policy bridge_attrs[__BRIDGE_ATTR_MAX] = {
  50         [BRIDGE_ATTR_PORTS] = { "ports", BLOBMSG_TYPE_ARRAY },
  51         [BRIDGE_ATTR_STP] = { "stp", BLOBMSG_TYPE_BOOL },
  52         [BRIDGE_ATTR_FORWARD_DELAY] = { "forward_delay", BLOBMSG_TYPE_INT32 },
  53         [BRIDGE_ATTR_PRIORITY] = { "priority", BLOBMSG_TYPE_INT32 },
  54         [BRIDGE_ATTR_AGEING_TIME] = { "ageing_time", BLOBMSG_TYPE_INT32 },
  55         [BRIDGE_ATTR_HELLO_TIME] = { "hello_time", BLOBMSG_TYPE_INT32 },
  56         [BRIDGE_ATTR_MAX_AGE] = { "max_age", BLOBMSG_TYPE_INT32 },
  57         [BRIDGE_ATTR_IGMP_SNOOP] = { "igmp_snooping", BLOBMSG_TYPE_BOOL },
  58         [BRIDGE_ATTR_BRIDGE_EMPTY] = { "bridge_empty", BLOBMSG_TYPE_BOOL },
  59         [BRIDGE_ATTR_MULTICAST_QUERIER] = { "multicast_querier", BLOBMSG_TYPE_BOOL },
  60         [BRIDGE_ATTR_HASH_MAX] = { "hash_max", BLOBMSG_TYPE_INT32 },
  61         [BRIDGE_ATTR_ROBUSTNESS] = { "robustness", BLOBMSG_TYPE_INT32 },
  62         [BRIDGE_ATTR_QUERY_INTERVAL] = { "query_interval", BLOBMSG_TYPE_INT32 },
  63         [BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL] = { "query_response_interval", BLOBMSG_TYPE_INT32 },
  64         [BRIDGE_ATTR_LAST_MEMBER_INTERVAL] = { "last_member_interval", BLOBMSG_TYPE_INT32 },
  65         [BRIDGE_ATTR_VLAN_FILTERING] = { "vlan_filtering", BLOBMSG_TYPE_BOOL },
  66         [BRIDGE_ATTR_HAS_VLANS] = { "__has_vlans", BLOBMSG_TYPE_BOOL }, /* internal */
  67         [BRIDGE_ATTR_STP_KERNEL] = { "stp_kernel", BLOBMSG_TYPE_BOOL },
  68         [BRIDGE_ATTR_STP_PROTO] = { "stp_proto", BLOBMSG_TYPE_STRING },
  69 };
  70
  71 static const struct uci_blob_param_info bridge_attr_info[__BRIDGE_ATTR_MAX] = {
  72         [BRIDGE_ATTR_PORTS] = { .type = BLOBMSG_TYPE_STRING },
  73 };
  74
  75 static const struct uci_blob_param_list bridge_attr_list = {
  76         .n_params = __BRIDGE_ATTR_MAX,
  77         .params = bridge_attrs,
  78         .info = bridge_attr_info,
  79
  80         .n_next = 1,
  81         .next = { &device_attr_list },
  82 };
  83
  84 static struct blob_buf b;
  85 static struct device *bridge_create(const char *name, struct device_type *devtype,
  86         struct blob_attr *attr);
  87 static void bridge_config_init(struct device *dev);
  88 static void bridge_dev_vlan_update(struct device *dev);
  89 static void bridge_free(struct device *dev);
  90 static void bridge_stp_init(struct device *dev);
  91 static void bridge_dump_info(struct device *dev, struct blob_buf *b);
  92 static enum dev_change_type
  93 bridge_reload(struct device *dev, struct blob_attr *attr);
  94
  95 static struct device_type bridge_device_type = {
  96         .name = "bridge",
  97         .config_params = &bridge_attr_list,
  98
  99         .bridge_capability = true,
 100         .name_prefix = "br",
 101
 102         .create = bridge_create,
 103         .config_init = bridge_config_init,
 104         .vlan_update = bridge_dev_vlan_update,
 105         .reload = bridge_reload,
 106         .free = bridge_free,
 107         .dump_info = bridge_dump_info,
 108         .stp_init = bridge_stp_init,
 109 };
 110
 111 struct bridge_state {
 112         struct device dev;
 113         device_state_cb set_state;
 114
 115         struct blob_attr *config_data;
 116         struct bridge_config config;
 117         struct blob_attr *ports;
 118         bool active;
 119         bool force_active;
 120         bool has_vlans;
 121
 122         struct uloop_timeout retry;
 123         struct bridge_member *primary_port;
 124         struct vlist_tree members;
 125         int n_present;
 126         int n_failed;
 127 };
 128
 129 struct bridge_member {
 130         struct vlist_node node;
 131         struct bridge_state *bst;
 132         struct device_user dev;
 133         struct uloop_timeout check_timer;
 134         uint16_t pvid;
 135         bool present;
 136         bool active;
 137         char name[];
 138 };
 139
 140 static void
 141 bridge_reset_primary(struct bridge_state *bst)
 142 {
 143         struct bridge_member *bm;
 144
 145         if (!bst->primary_port &&
 146             (bst->dev.settings.flags & DEV_OPT_MACADDR))
 147                 return;
 148
 149         bst->primary_port = NULL;
 150         bst->dev.settings.flags &= ~DEV_OPT_MACADDR;
 151         vlist_for_each_element(&bst->members, bm, node) {
 152                 uint8_t *macaddr;
 153
 154                 if (!bm->present)
 155                         continue;
 156
 157                 bst->primary_port = bm;
 158                 if (bm->dev.dev->settings.flags & DEV_OPT_MACADDR)
 159                         macaddr = bm->dev.dev->settings.macaddr;
 160                 else
 161                         macaddr = bm->dev.dev->orig_settings.macaddr;
 162                 memcpy(bst->dev.settings.macaddr, macaddr, 6);
 163                 bst->dev.settings.flags |= DEV_OPT_MACADDR;
 164                 return;
 165         }
 166 }
 167
 168 static struct bridge_vlan_port *
 169 bridge_find_vlan_member_port(struct bridge_member *bm, struct bridge_vlan *vlan)
 170 {
 171         struct bridge_vlan_hotplug_port *port;
 172         const char *ifname = bm->dev.dev->ifname;
 173         int i;
 174
 175         for (i = 0; i < vlan->n_ports; i++) {
 176                 if (strcmp(vlan->ports[i].ifname, ifname) != 0)
 177                         continue;
 178
 179                 return &vlan->ports[i];
 180         }
 181
 182         list_for_each_entry(port, &vlan->hotplug_ports, list) {
 183                 if (strcmp(port->port.ifname, ifname) != 0)
 184                         continue;
 185
 186                 return &port->port;
 187         }
 188
 189         return NULL;
 190 }
 191
 192 static bool
 193 bridge_member_vlan_is_pvid(struct bridge_member *bm, struct bridge_vlan_port *port)
 194 {
 195         return (!bm->pvid && (port->flags & BRVLAN_F_UNTAGGED)) ||
 196                (port->flags & BRVLAN_F_PVID);
 197 }
 198
 199 static void
 200 __bridge_set_member_vlan(struct bridge_member *bm, struct bridge_vlan *vlan,
 201                          struct bridge_vlan_port *port, bool add)
 202 {
 203         uint16_t flags;
 204
 205         flags = port->flags;
 206         if (bm->pvid == vlan->vid)
 207                 flags |= BRVLAN_F_PVID;
 208
 209         system_bridge_vlan(port->ifname, vlan->vid, add, flags);
 210 }
 211
 212 static void
 213 bridge_set_member_vlan(struct bridge_member *bm, struct bridge_vlan *vlan, bool add)
 214 {
 215         struct bridge_vlan_port *port;
 216
 217         if (!bm->present)
 218                 return;
 219
 220         port = bridge_find_vlan_member_port(bm, vlan);
 221         if (!port)
 222                 return;
 223
 224         if (bridge_member_vlan_is_pvid(bm, port))
 225                 bm->pvid = vlan->vid;
 226
 227         __bridge_set_member_vlan(bm, vlan, port, add);
 228 }
 229
 230 static void
 231 bridge_set_local_vlan(struct bridge_state *bst, struct bridge_vlan *vlan, bool add)
 232 {
 233         if (!vlan->local && add)
 234                 return;
 235
 236         system_bridge_vlan(bst->dev.ifname, vlan->vid, add, BRVLAN_F_SELF);
 237 }
 238
 239 static void
 240 bridge_set_local_vlans(struct bridge_state *bst, bool add)
 241 {
 242         struct bridge_vlan *vlan;
 243
 244         vlist_for_each_element(&bst->dev.vlans, vlan, node)
 245                 bridge_set_local_vlan(bst, vlan, add);
 246 }
 247
 248 static struct bridge_vlan *
 249 bridge_recalc_member_pvid(struct bridge_member *bm)
 250 {
 251         struct bridge_state *bst = bm->bst;
 252         struct bridge_vlan_port *port;
 253         struct bridge_vlan *vlan, *ret = NULL;
 254
 255         vlist_for_each_element(&bst->dev.vlans, vlan, node) {
 256                 port = bridge_find_vlan_member_port(bm, vlan);
 257                 if (!port)
 258                         continue;
 259
 260                 if (!bridge_member_vlan_is_pvid(bm, port))
 261                         continue;
 262
 263                 ret = vlan;
 264                 if (port->flags & BRVLAN_F_PVID)
 265                         break;
 266         }
 267
 268         return ret;
 269 }
 270
 271 static void
 272 bridge_set_vlan_state(struct bridge_state *bst, struct bridge_vlan *vlan, bool add)
 273 {
 274         struct bridge_member *bm;
 275         struct bridge_vlan *vlan2;
 276
 277         bridge_set_local_vlan(bst, vlan, add);
 278
 279         vlist_for_each_element(&bst->members, bm, node) {
 280                 struct bridge_vlan_port *port;
 281                 int new_pvid = -1;
 282
 283                 port = bridge_find_vlan_member_port(bm, vlan);
 284                 if (!port)
 285                         continue;
 286
 287                 if (add) {
 288                         if (bridge_member_vlan_is_pvid(bm, port))
 289                                 bm->pvid = vlan->vid;
 290                 } else if (bm->pvid == vlan->vid) {
 291                         vlan2 = bridge_recalc_member_pvid(bm);
 292                         if (vlan2 && vlan2->vid != vlan->vid) {
 293                                 bridge_set_member_vlan(bm, vlan2, false);
 294                                 bridge_set_member_vlan(bm, vlan2, true);
 295                         }
 296                         new_pvid = vlan2 ? vlan2->vid : 0;
 297                 }
 298
 299                 if (!bm->present)
 300                         continue;
 301
 302                 __bridge_set_member_vlan(bm, vlan, port, add);
 303                 if (new_pvid >= 0)
 304                         bm->pvid = new_pvid;
 305         }
 306 }
 307
 308 static int
 309 bridge_disable_member(struct bridge_member *bm, bool keep_dev)
 310 {
 311         struct bridge_state *bst = bm->bst;
 312         struct bridge_vlan *vlan;
 313
 314         if (!bm->present || !bm->active)
 315                 return 0;
 316
 317         bm->active = false;
 318         vlist_for_each_element(&bst->dev.vlans, vlan, node)
 319                 bridge_set_member_vlan(bm, vlan, false);
 320
 321         system_bridge_delif(&bst->dev, bm->dev.dev);
 322         if (!keep_dev)
 323                 device_release(&bm->dev);
 324
 325         device_broadcast_event(&bst->dev, DEV_EVENT_TOPO_CHANGE);
 326
 327         return 0;
 328 }
 329
 330 static void bridge_stp_notify(struct bridge_state *bst)
 331 {
 332         struct bridge_config *cfg = &bst->config;
 333
 334         if (!cfg->stp || cfg->stp_kernel)
 335                 return;
 336
 337         blob_buf_init(&b, 0);
 338         blobmsg_add_string(&b, "name", bst->dev.ifname);
 339         if (cfg->stp_proto)
 340                 blobmsg_add_string(&b, "proto", cfg->stp_proto);
 341         blobmsg_add_u32(&b, "forward_delay", cfg->forward_delay);
 342         blobmsg_add_u32(&b, "hello_time", cfg->hello_time);
 343         blobmsg_add_u32(&b, "max_age", cfg->max_age);
 344         if (cfg->flags & BRIDGE_OPT_AGEING_TIME)
 345                 blobmsg_add_u32(&b, "ageing_time", cfg->ageing_time);
 346         netifd_ubus_device_notify("stp_init", b.head, 1000);
 347 }
 348
 349 static int
 350 bridge_enable_interface(struct bridge_state *bst)
 351 {
 352         int ret;
 353
 354         if (bst->active)
 355                 return 0;
 356
 357         bridge_stp_notify(bst);
 358         ret = system_bridge_addbr(&bst->dev, &bst->config);
 359         if (ret < 0)
 360                 return ret;
 361
 362         if (bst->has_vlans) {
 363                 /* delete default VLAN 1 */
 364                 system_bridge_vlan(bst->dev.ifname, 1, false, BRVLAN_F_SELF);
 365
 366                 bridge_set_local_vlans(bst, true);
 367         }
 368
 369         bst->active = true;
 370         return 0;
 371 }
 372
 373 static void
 374 bridge_stp_init(struct device *dev)
 375 {
 376         struct bridge_state *bst;
 377
 378         bst = container_of(dev, struct bridge_state, dev);
 379         if (!bst->config.stp || !bst->active)
 380                 return;
 381
 382         bridge_stp_notify(bst);
 383         system_bridge_set_stp_state(&bst->dev, false);
 384         system_bridge_set_stp_state(&bst->dev, true);
 385 }
 386
 387 static void
 388 bridge_disable_interface(struct bridge_state *bst)
 389 {
 390         if (!bst->active)
 391                 return;
 392
 393         system_bridge_delbr(&bst->dev);
 394         bst->active = false;
 395 }
 396
 397 static int
 398 bridge_enable_member(struct bridge_member *bm)
 399 {
 400         struct bridge_state *bst = bm->bst;
 401         struct bridge_vlan *vlan;
 402         struct device *dev;
 403         int ret;
 404
 405         if (!bm->present)
 406                 return 0;
 407
 408         ret = bridge_enable_interface(bst);
 409         if (ret)
 410                 goto error;
 411
 412         /* Disable IPv6 for bridge members */
 413         if (!(bm->dev.dev->settings.flags & DEV_OPT_IPV6)) {
 414                 bm->dev.dev->settings.ipv6 = 0;
 415                 bm->dev.dev->settings.flags |= DEV_OPT_IPV6;
 416         }
 417
 418         ret = device_claim(&bm->dev);
 419         if (ret < 0)
 420                 goto error;
 421
 422         dev = bm->dev.dev;
 423         if (dev->settings.auth && !dev->auth_status)
 424                 return -1;
 425
 426         if (bm->active)
 427                 return 0;
 428
 429         ret = system_bridge_addif(&bst->dev, bm->dev.dev);
 430         if (ret < 0) {
 431                 D(DEVICE, "Bridge device %s could not be added\n", bm->dev.dev->ifname);
 432                 goto error;
 433         }
 434
 435         bm->active = true;
 436         if (bst->has_vlans) {
 437                 /* delete default VLAN 1 */
 438                 system_bridge_vlan(bm->dev.dev->ifname, 1, false, 0);
 439
 440                 vlist_for_each_element(&bst->dev.vlans, vlan, node)
 441                         bridge_set_member_vlan(bm, vlan, true);
 442         }
 443
 444         device_set_present(&bst->dev, true);
 445         device_broadcast_event(&bst->dev, DEV_EVENT_TOPO_CHANGE);
 446
 447         return 0;
 448
 449 error:
 450         bst->n_failed++;
 451         bm->present = false;
 452         bst->n_present--;
 453         device_release(&bm->dev);
 454
 455         return ret;
 456 }
 457
 458 static void
 459 bridge_remove_member(struct bridge_member *bm)
 460 {
 461         struct bridge_state *bst = bm->bst;
 462
 463         if (!bm->present)
 464                 return;
 465
 466         if (bst->dev.active)
 467                 bridge_disable_member(bm, false);
 468
 469         bm->present = false;
 470         bm->bst->n_present--;
 471
 472         if (bm == bst->primary_port)
 473                 bridge_reset_primary(bst);
 474
 475         if (bst->config.bridge_empty)
 476                 return;
 477
 478         bst->force_active = false;
 479         if (bst->n_present == 0)
 480                 device_set_present(&bst->dev, false);
 481 }
 482
 483 static void
 484 bridge_free_member(struct bridge_member *bm)
 485 {
 486         struct bridge_state *bst = bm->bst;
 487         struct device *dev = bm->dev.dev;
 488         const char *ifname = dev->ifname;
 489         struct bridge_vlan *vlan;
 490
 491         bridge_remove_member(bm);
 492
 493 restart:
 494         vlist_for_each_element(&bst->dev.vlans, vlan, node) {
 495                 struct bridge_vlan_hotplug_port *port, *tmp;
 496                 bool free_port = false;
 497
 498                 list_for_each_entry_safe(port, tmp, &vlan->hotplug_ports, list) {
 499                         if (strcmp(port->port.ifname, ifname) != 0)
 500                                 continue;
 501
 502                         list_del(&port->list);
 503                         free(port);
 504                         free_port = true;
 505                 }
 506
 507                 if (!free_port || !list_empty(&vlan->hotplug_ports) ||
 508                     vlan->n_ports || vlan->node.version != -1)
 509                         continue;
 510
 511                 vlist_delete(&bst->dev.vlans, &vlan->node);
 512                 goto restart;
 513         }
 514
 515         device_lock();
 516
 517         device_remove_user(&bm->dev);
 518         uloop_timeout_cancel(&bm->check_timer);
 519
 520         /*
 521          * When reloading the config and moving a device from one bridge to
 522          * another, the other bridge may have tried to claim this device
 523          * before it was removed here.
 524          * Ensure that claiming the device is retried by toggling its present
 525          * state
 526          */
 527         if (dev->present) {
 528                 device_set_present(dev, false);
 529                 device_set_present(dev, true);
 530         }
 531
 532         device_unlock();
 533
 534         free(bm);
 535 }
 536
 537 static void
 538 bridge_check_retry(struct bridge_state *bst)
 539 {
 540         if (!bst->n_failed)
 541                 return;
 542
 543         uloop_timeout_set(&bst->retry, 100);
 544 }
 545
 546 static void
 547 bridge_member_check_cb(struct uloop_timeout *t)
 548 {
 549         struct bridge_member *bm;
 550         struct bridge_state *bst;
 551
 552         bm = container_of(t, struct bridge_member, check_timer);
 553         bst = bm->bst;
 554
 555         if (system_bridge_vlan_check(&bst->dev, bm->dev.dev->ifname) <= 0)
 556                 return;
 557
 558         bridge_disable_member(bm, true);
 559         bridge_enable_member(bm);
 560 }
 561
 562 static void
 563 bridge_member_cb(struct device_user *dep, enum device_event ev)
 564 {
 565         struct bridge_member *bm = container_of(dep, struct bridge_member, dev);
 566         struct bridge_state *bst = bm->bst;
 567         struct device *dev = dep->dev;
 568
 569         switch (ev) {
 570         case DEV_EVENT_ADD:
 571                 assert(!bm->present);
 572
 573                 bm->present = true;
 574                 bst->n_present++;
 575
 576                 if (bst->n_present == 1)
 577                         device_set_present(&bst->dev, true);
 578                 fallthrough;
 579         case DEV_EVENT_AUTH_UP:
 580                 if (!bst->dev.active)
 581                         break;
 582
 583                 if (bridge_enable_member(bm))
 584                         break;
 585
 586                 /*
 587                  * Adding a bridge member can overwrite the bridge mtu
 588                  * in the kernel, apply the bridge settings in case the
 589                  * bridge mtu is set
 590                  */
 591                 system_if_apply_settings(&bst->dev, &bst->dev.settings,
 592                                          DEV_OPT_MTU | DEV_OPT_MTU6);
 593                 break;
 594         case DEV_EVENT_LINK_UP:
 595                 if (bst->has_vlans)
 596                         uloop_timeout_set(&bm->check_timer, 1000);
 597                 break;
 598         case DEV_EVENT_LINK_DOWN:
 599                 if (!dev->settings.auth)
 600                         break;
 601
 602                 bridge_disable_member(bm, true);
 603                 break;
 604         case DEV_EVENT_REMOVE:
 605                 if (dep->hotplug) {
 606                         vlist_delete(&bst->members, &bm->node);
 607                         return;
 608                 }
 609
 610                 if (bm->present)
 611                         bridge_remove_member(bm);
 612
 613                 break;
 614         default:
 615                 return;
 616         }
 617 }
 618
 619 static int
 620 bridge_set_down(struct bridge_state *bst)
 621 {
 622         struct bridge_member *bm;
 623
 624         bst->set_state(&bst->dev, false);
 625
 626         vlist_for_each_element(&bst->members, bm, node)
 627                 bridge_disable_member(bm, false);
 628
 629         bridge_disable_interface(bst);
 630
 631         return 0;
 632 }
 633
 634 static int
 635 bridge_set_up(struct bridge_state *bst)
 636 {
 637         struct bridge_member *bm;
 638         int ret;
 639
 640         bst->has_vlans = !avl_is_empty(&bst->dev.vlans.avl);
 641         if (!bst->n_present) {
 642                 if (!bst->force_active)
 643                         return -ENOENT;
 644
 645                 ret = bridge_enable_interface(bst);
 646                 if (ret)
 647                         return ret;
 648         }
 649
 650         bst->n_failed = 0;
 651         vlist_for_each_element(&bst->members, bm, node)
 652                 bridge_enable_member(bm);
 653         bridge_check_retry(bst);
 654
 655         if (!bst->force_active && !bst->n_present) {
 656                 /* initialization of all member interfaces failed */
 657                 bridge_disable_interface(bst);
 658                 device_set_present(&bst->dev, false);
 659                 return -ENOENT;
 660         }
 661
 662         bridge_reset_primary(bst);
 663         ret = bst->set_state(&bst->dev, true);
 664         if (ret < 0)
 665                 bridge_set_down(bst);
 666
 667         return ret;
 668 }
 669
 670 static int
 671 bridge_set_state(struct device *dev, bool up)
 672 {
 673         struct bridge_state *bst;
 674
 675         bst = container_of(dev, struct bridge_state, dev);
 676
 677         if (up)
 678                 return bridge_set_up(bst);
 679         else
 680                 return bridge_set_down(bst);
 681 }
 682
 683 static struct bridge_member *
 684 bridge_create_member(struct bridge_state *bst, const char *name,
 685                      struct device *dev, bool hotplug)
 686 {
 687         struct bridge_member *bm;
 688
 689         bm = calloc(1, sizeof(*bm) + strlen(name) + 1);
 690         if (!bm)
 691                 return NULL;
 692
 693         bm->bst = bst;
 694         bm->dev.cb = bridge_member_cb;
 695         bm->dev.hotplug = hotplug;
 696         bm->check_timer.cb = bridge_member_check_cb;
 697         strcpy(bm->name, name);
 698         bm->dev.dev = dev;
 699         vlist_add(&bst->members, &bm->node, bm->name);
 700         /*
 701          * Need to look up the bridge member again as the above
 702          * created pointer will be freed in case the bridge member
 703          * already existed
 704          */
 705         bm = vlist_find(&bst->members, name, bm, node);
 706         if (hotplug && bm)
 707                 bm->node.version = -1;
 708
 709         return bm;
 710 }
 711
 712 static void
 713 bridge_member_update(struct vlist_tree *tree, struct vlist_node *node_new,
 714                      struct vlist_node *node_old)
 715 {
 716         struct bridge_member *bm;
 717         struct device *dev;
 718
 719         if (node_new) {
 720                 bm = container_of(node_new, struct bridge_member, node);
 721
 722                 if (node_old) {
 723                         free(bm);
 724                         return;
 725                 }
 726
 727                 dev = bm->dev.dev;
 728                 bm->dev.dev = NULL;
 729                 device_add_user(&bm->dev, dev);
 730         }
 731
 732
 733         if (node_old) {
 734                 bm = container_of(node_old, struct bridge_member, node);
 735                 bridge_free_member(bm);
 736         }
 737 }
 738
 739
 740 static void
 741 bridge_add_member(struct bridge_state *bst, const char *name)
 742 {
 743         struct device *dev;
 744
 745         dev = device_get(name, true);
 746         if (!dev)
 747                 return;
 748
 749         bridge_create_member(bst, name, dev, false);
 750 }
 751
 752 static struct bridge_vlan *
 753 bridge_hotplug_get_vlan(struct bridge_state *bst, uint16_t vid)
 754 {
 755         struct bridge_vlan *vlan;
 756
 757         vlan = vlist_find(&bst->dev.vlans, &vid, vlan, node);
 758         if (vlan)
 759                 return vlan;
 760
 761         vlan = calloc(1, sizeof(*vlan));
 762         vlan->vid = vid;
 763         vlan->local = true;
 764         INIT_LIST_HEAD(&vlan->hotplug_ports);
 765         vlist_add(&bst->dev.vlans, &vlan->node, &vlan->vid);
 766         vlan->node.version = -1;
 767
 768         return vlan;
 769 }
 770
 771 static struct bridge_vlan_hotplug_port *
 772 bridge_hotplug_get_vlan_port(struct bridge_vlan *vlan, const char *ifname)
 773 {
 774         struct bridge_vlan_hotplug_port *port;
 775
 776         list_for_each_entry(port, &vlan->hotplug_ports, list)
 777                 if (!strcmp(port->port.ifname, ifname))
 778                         return port;
 779
 780         return NULL;
 781 }
 782
 783 static void
 784 bridge_hotplug_set_member_vlans(struct bridge_state *bst, struct blob_attr *vlans,
 785                                 const char *ifname, struct bridge_member *bm, bool add)
 786 {
 787         struct bridge_vlan *vlan;
 788         struct blob_attr *cur;
 789         int rem;
 790
 791         if (!vlans)
 792                 return;
 793
 794         blobmsg_for_each_attr(cur, vlans, rem) {
 795                 struct bridge_vlan_hotplug_port *port;
 796                 uint16_t flags = BRVLAN_F_UNTAGGED;
 797                 char *name_buf;
 798                 unsigned int vid;
 799                 char *end;
 800
 801                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 802                         continue;
 803
 804                 vid = strtoul(blobmsg_get_string(cur), &end, 0);
 805                 if (!vid || vid > 4095)
 806                         continue;
 807
 808                 vlan = bridge_hotplug_get_vlan(bst, vid);
 809                 if (!vlan)
 810                         continue;
 811
 812                 if (vlan->pending) {
 813                         vlan->pending = false;
 814                         bridge_set_vlan_state(bst, vlan, true);
 815                 }
 816
 817                 if (end && *end) {
 818                         if (*end != ':')
 819                                 continue;
 820
 821                         for (end++; *end; end++) {
 822                                 switch (*end) {
 823                                 case 't':
 824                                         flags &= ~BRVLAN_F_UNTAGGED;
 825                                         break;
 826                                 case '*':
 827                                         flags |= BRVLAN_F_PVID;
 828                                         break;
 829                                 }
 830                         }
 831                 }
 832
 833                 port = bridge_hotplug_get_vlan_port(vlan, ifname);
 834                 if (!add) {
 835                         if (!port)
 836                                 continue;
 837
 838                         __bridge_set_member_vlan(bm, vlan, &port->port, false);
 839                         list_del(&port->list);
 840                         free(port);
 841                         continue;
 842                 }
 843
 844                 if (port) {
 845                         if (port->port.flags == flags)
 846                                 continue;
 847
 848                         __bridge_set_member_vlan(bm, vlan, &port->port, false);
 849                         port->port.flags = flags;
 850                         __bridge_set_member_vlan(bm, vlan, &port->port, true);
 851                         continue;
 852                 }
 853
 854                 port = calloc_a(sizeof(*port), &name_buf, strlen(ifname) + 1);
 855                 if (!port)
 856                         continue;
 857
 858                 port->port.flags = flags;
 859                 port->port.ifname = strcpy(name_buf, ifname);
 860                 list_add_tail(&port->list, &vlan->hotplug_ports);
 861
 862                 if (!bm)
 863                         continue;
 864
 865                 __bridge_set_member_vlan(bm, vlan, &port->port, true);
 866         }
 867 }
 868
 869 static int
 870 bridge_hotplug_add(struct device *dev, struct device *member, struct blob_attr *vlan)
 871 {
 872         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 873         struct bridge_member *bm;
 874
 875         bm = vlist_find(&bst->members, member->ifname, bm, node);
 876         bridge_hotplug_set_member_vlans(bst, vlan, member->ifname, bm, true);
 877         if (!bm)
 878                 bridge_create_member(bst, member->ifname, member, true);
 879
 880         return 0;
 881 }
 882
 883 static int
 884 bridge_hotplug_del(struct device *dev, struct device *member, struct blob_attr *vlan)
 885 {
 886         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 887         struct bridge_member *bm;
 888
 889         bm = vlist_find(&bst->members, member->ifname, bm, node);
 890         if (!bm)
 891                 return UBUS_STATUS_NOT_FOUND;
 892
 893         bridge_hotplug_set_member_vlans(bst, vlan, member->ifname, bm, false);
 894         if (!bm->dev.hotplug)
 895                 return 0;
 896
 897         vlist_delete(&bst->members, &bm->node);
 898         return 0;
 899 }
 900
 901 static int
 902 bridge_hotplug_prepare(struct device *dev, struct device **bridge_dev)
 903 {
 904         struct bridge_state *bst;
 905
 906         if (bridge_dev)
 907                 *bridge_dev = dev;
 908
 909         bst = container_of(dev, struct bridge_state, dev);
 910         bst->force_active = true;
 911         device_set_present(&bst->dev, true);
 912
 913         return 0;
 914 }
 915
 916 static const struct device_hotplug_ops bridge_ops = {
 917         .prepare = bridge_hotplug_prepare,
 918         .add = bridge_hotplug_add,
 919         .del = bridge_hotplug_del
 920 };
 921
 922 static void
 923 bridge_free(struct device *dev)
 924 {
 925         struct bridge_state *bst;
 926
 927         bst = container_of(dev, struct bridge_state, dev);
 928         vlist_flush_all(&bst->members);
 929         vlist_flush_all(&dev->vlans);
 930         kvlist_free(&dev->vlan_aliases);
 931         free(bst->config_data);
 932         free(bst);
 933 }
 934
 935 static void
 936 bridge_dump_port(struct blob_buf *b, struct bridge_vlan_port *port)
 937 {
 938         bool tagged = !(port->flags & BRVLAN_F_UNTAGGED);
 939         bool pvid = (port->flags & BRVLAN_F_PVID);
 940
 941         blobmsg_printf(b, "%s%s%s%s\n", port->ifname,
 942                 tagged || pvid ? ":" : "",
 943                 tagged ? "t" : "",
 944                 pvid ? "*" : "");
 945 }
 946
 947 static void
 948 bridge_dump_vlan(struct blob_buf *b, struct bridge_vlan *vlan)
 949 {
 950         struct bridge_vlan_hotplug_port *port;
 951         void *c, *p;
 952         int i;
 953
 954         c = blobmsg_open_table(b, NULL);
 955
 956         blobmsg_add_u32(b, "id", vlan->vid);
 957         blobmsg_add_u8(b, "local", vlan->local);
 958
 959         p = blobmsg_open_array(b, "ports");
 960
 961         for (i = 0; i < vlan->n_ports; i++)
 962             bridge_dump_port(b, &vlan->ports[i]);
 963
 964         list_for_each_entry(port, &vlan->hotplug_ports, list)
 965                 bridge_dump_port(b, &port->port);
 966
 967         blobmsg_close_array(b, p);
 968
 969         blobmsg_close_table(b, c);
 970 }
 971
 972 static void
 973 bridge_dump_info(struct device *dev, struct blob_buf *b)
 974 {
 975         struct bridge_state *bst;
 976         struct bridge_member *bm;
 977         struct bridge_vlan *vlan;
 978         void *list;
 979
 980         bst = container_of(dev, struct bridge_state, dev);
 981
 982         system_if_dump_info(dev, b);
 983         list = blobmsg_open_array(b, "bridge-members");
 984
 985         vlist_for_each_element(&bst->members, bm, node) {
 986                 if (bm->dev.dev->hidden)
 987                         continue;
 988
 989                 blobmsg_add_string(b, NULL, bm->dev.dev->ifname);
 990         }
 991
 992         blobmsg_close_array(b, list);
 993
 994         if (avl_is_empty(&dev->vlans.avl))
 995                 return;
 996
 997         list = blobmsg_open_array(b, "bridge-vlans");
 998
 999         vlist_for_each_element(&bst->dev.vlans, vlan, node)
1000                 bridge_dump_vlan(b, vlan);
1001
1002         blobmsg_close_array(b, list);
1003 }
1004
1005 static void
1006 bridge_config_init(struct device *dev)
1007 {
1008         struct bridge_state *bst;
1009         struct bridge_vlan *vlan;
1010         struct blob_attr *cur;
1011         int i, rem;
1012
1013         bst = container_of(dev, struct bridge_state, dev);
1014
1015         if (bst->config.bridge_empty) {
1016                 bst->force_active = true;
1017                 device_set_present(&bst->dev, true);
1018         }
1019
1020         bst->n_failed = 0;
1021         vlist_update(&bst->members);
1022         if (bst->ports) {
1023                 blobmsg_for_each_attr(cur, bst->ports, rem) {
1024                         bridge_add_member(bst, blobmsg_data(cur));
1025                 }
1026         }
1027
1028         vlist_for_each_element(&bst->dev.vlans, vlan, node)
1029                 for (i = 0; i < vlan->n_ports; i++)
1030                         bridge_add_member(bst, vlan->ports[i].ifname);
1031
1032         vlist_flush(&bst->members);
1033         bridge_check_retry(bst);
1034 }
1035
1036 static void
1037 bridge_apply_settings(struct bridge_state *bst, struct blob_attr **tb)
1038 {
1039         struct bridge_config *cfg = &bst->config;
1040         struct blob_attr *cur;
1041
1042         /* defaults */
1043         memset(cfg, 0, sizeof(*cfg));
1044         cfg->stp = false;
1045         cfg->stp_kernel = false;
1046         cfg->robustness = 2;
1047         cfg->igmp_snoop = false;
1048         cfg->multicast_querier = false;
1049         cfg->query_interval = 12500;
1050         cfg->query_response_interval = 1000;
1051         cfg->last_member_interval = 100;
1052         cfg->hash_max = 512;
1053         cfg->bridge_empty = false;
1054         cfg->priority = 0x7FFF;
1055         cfg->vlan_filtering = false;
1056
1057         cfg->forward_delay = 8;
1058         cfg->max_age = 10;
1059         cfg->hello_time = 1;
1060
1061         if ((cur = tb[BRIDGE_ATTR_STP]))
1062                 cfg->stp = blobmsg_get_bool(cur);
1063
1064         if ((cur = tb[BRIDGE_ATTR_STP_KERNEL]))
1065                 cfg->stp = blobmsg_get_bool(cur);
1066
1067         if ((cur = tb[BRIDGE_ATTR_STP_PROTO]))
1068                 cfg->stp_proto = blobmsg_get_string(cur);
1069
1070         if ((cur = tb[BRIDGE_ATTR_FORWARD_DELAY]))
1071                 cfg->forward_delay = blobmsg_get_u32(cur);
1072
1073         if ((cur = tb[BRIDGE_ATTR_PRIORITY]))
1074                 cfg->priority = blobmsg_get_u32(cur);
1075
1076         if ((cur = tb[BRIDGE_ATTR_IGMP_SNOOP]))
1077                 cfg->multicast_querier = cfg->igmp_snoop = blobmsg_get_bool(cur);
1078
1079         if ((cur = tb[BRIDGE_ATTR_MULTICAST_QUERIER]))
1080                 cfg->multicast_querier = blobmsg_get_bool(cur);
1081
1082         if ((cur = tb[BRIDGE_ATTR_HASH_MAX]))
1083                 cfg->hash_max = blobmsg_get_u32(cur);
1084
1085         if ((cur = tb[BRIDGE_ATTR_ROBUSTNESS])) {
1086                 cfg->robustness = blobmsg_get_u32(cur);
1087                 cfg->flags |= BRIDGE_OPT_ROBUSTNESS;
1088         }
1089
1090         if ((cur = tb[BRIDGE_ATTR_QUERY_INTERVAL])) {
1091                 cfg->query_interval = blobmsg_get_u32(cur);
1092                 cfg->flags |= BRIDGE_OPT_QUERY_INTERVAL;
1093         }
1094
1095         if ((cur = tb[BRIDGE_ATTR_QUERY_RESPONSE_INTERVAL])) {
1096                 cfg->query_response_interval = blobmsg_get_u32(cur);
1097                 cfg->flags |= BRIDGE_OPT_QUERY_RESPONSE_INTERVAL;
1098         }
1099
1100         if ((cur = tb[BRIDGE_ATTR_LAST_MEMBER_INTERVAL])) {
1101                 cfg->last_member_interval = blobmsg_get_u32(cur);
1102                 cfg->flags |= BRIDGE_OPT_LAST_MEMBER_INTERVAL;
1103         }
1104
1105         if ((cur = tb[BRIDGE_ATTR_AGEING_TIME])) {
1106                 cfg->ageing_time = blobmsg_get_u32(cur);
1107                 cfg->flags |= BRIDGE_OPT_AGEING_TIME;
1108         }
1109
1110         if ((cur = tb[BRIDGE_ATTR_HELLO_TIME]))
1111                 cfg->hello_time = blobmsg_get_u32(cur);
1112
1113         if ((cur = tb[BRIDGE_ATTR_MAX_AGE]))
1114                 cfg->max_age = blobmsg_get_u32(cur);
1115
1116         if ((cur = tb[BRIDGE_ATTR_BRIDGE_EMPTY]))
1117                 cfg->bridge_empty = blobmsg_get_bool(cur);
1118
1119         if ((cur = tb[BRIDGE_ATTR_VLAN_FILTERING]))
1120                 cfg->vlan_filtering = blobmsg_get_bool(cur);
1121 }
1122
1123 static enum dev_change_type
1124 bridge_reload(struct device *dev, struct blob_attr *attr)
1125 {
1126         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
1127         struct blob_attr *tb_br[__BRIDGE_ATTR_MAX];
1128         enum dev_change_type ret = DEV_CONFIG_APPLIED;
1129         unsigned long diff;
1130         struct bridge_state *bst;
1131
1132         BUILD_BUG_ON(sizeof(diff) < __BRIDGE_ATTR_MAX / 8);
1133         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1134
1135         bst = container_of(dev, struct bridge_state, dev);
1136         attr = blob_memdup(attr);
1137
1138         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
1139                 blob_data(attr), blob_len(attr));
1140         blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, tb_br,
1141                 blob_data(attr), blob_len(attr));
1142
1143         if (tb_dev[DEV_ATTR_MACADDR])
1144                 bst->primary_port = NULL;
1145
1146         bst->ports = tb_br[BRIDGE_ATTR_PORTS];
1147         device_init_settings(dev, tb_dev);
1148         bridge_apply_settings(bst, tb_br);
1149
1150         if (bst->config_data) {
1151                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
1152                 struct blob_attr *otb_br[__BRIDGE_ATTR_MAX];
1153
1154                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
1155                         blob_data(bst->config_data), blob_len(bst->config_data));
1156
1157                 diff = 0;
1158                 uci_blob_diff(tb_dev, otb_dev, &device_attr_list, &diff);
1159                 if (diff)
1160                     ret = DEV_CONFIG_RESTART;
1161
1162                 blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, otb_br,
1163                         blob_data(bst->config_data), blob_len(bst->config_data));
1164
1165                 diff = 0;
1166                 uci_blob_diff(tb_br, otb_br, &bridge_attr_list, &diff);
1167                 if (diff & ~(1 << BRIDGE_ATTR_PORTS))
1168                     ret = DEV_CONFIG_RESTART;
1169
1170                 bridge_config_init(dev);
1171         }
1172
1173         free(bst->config_data);
1174         bst->config_data = attr;
1175         return ret;
1176 }
1177
1178 static void
1179 bridge_retry_members(struct uloop_timeout *timeout)
1180 {
1181         struct bridge_state *bst = container_of(timeout, struct bridge_state, retry);
1182         struct bridge_member *bm;
1183
1184         bst->n_failed = 0;
1185         vlist_for_each_element(&bst->members, bm, node) {
1186                 if (bm->present)
1187                         continue;
1188
1189                 if (!bm->dev.dev->present)
1190                         continue;
1191
1192                 bm->present = true;
1193                 bst->n_present++;
1194                 bridge_enable_member(bm);
1195         }
1196 }
1197
1198 static int bridge_avl_cmp_u16(const void *k1, const void *k2, void *ptr)
1199 {
1200         const uint16_t *i1 = k1, *i2 = k2;
1201
1202         return *i1 - *i2;
1203 }
1204
1205 static bool
1206 bridge_vlan_equal(struct bridge_vlan *v1, struct bridge_vlan *v2)
1207 {
1208         int i;
1209
1210         if (v1->n_ports != v2->n_ports)
1211                 return false;
1212
1213         for (i = 0; i < v1->n_ports; i++)
1214                 if (v1->ports[i].flags != v2->ports[i].flags ||
1215                     strcmp(v1->ports[i].ifname, v2->ports[i].ifname) != 0)
1216                         return false;
1217
1218         return true;
1219 }
1220
1221 static void
1222 bridge_vlan_free(struct bridge_vlan *vlan)
1223 {
1224         struct bridge_vlan_hotplug_port *port, *tmp;
1225
1226         if (!vlan)
1227                 return;
1228
1229         list_for_each_entry_safe(port, tmp, &vlan->hotplug_ports, list)
1230                 free(port);
1231
1232         free(vlan);
1233 }
1234
1235 static void
1236 bridge_vlan_update(struct vlist_tree *tree, struct vlist_node *node_new,
1237                    struct vlist_node *node_old)
1238 {
1239         struct bridge_state *bst = container_of(tree, struct bridge_state, dev.vlans);
1240         struct bridge_vlan *vlan_new = NULL, *vlan_old = NULL;
1241
1242         if (!bst->has_vlans || !bst->active)
1243                 goto out;
1244
1245         if (node_old)
1246                 vlan_old = container_of(node_old, struct bridge_vlan, node);
1247         if (node_new)
1248                 vlan_new = container_of(node_new, struct bridge_vlan, node);
1249
1250         if (node_new && node_old && bridge_vlan_equal(vlan_old, vlan_new)) {
1251                 list_splice_init(&vlan_old->hotplug_ports, &vlan_new->hotplug_ports);
1252                 goto out;
1253         }
1254
1255         if (node_old)
1256                 bridge_set_vlan_state(bst, vlan_old, false);
1257
1258         if (node_old && node_new)
1259                 list_splice_init(&vlan_old->hotplug_ports, &vlan_new->hotplug_ports);
1260
1261         if (node_new)
1262                 vlan_new->pending = true;
1263
1264         bst->dev.config_pending = true;
1265
1266 out:
1267         bridge_vlan_free(vlan_old);
1268 }
1269
1270 static void
1271 bridge_dev_vlan_update(struct device *dev)
1272 {
1273         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
1274         struct bridge_vlan *vlan;
1275
1276         vlist_for_each_element(&dev->vlans, vlan, node) {
1277                 if (!vlan->pending)
1278                         continue;
1279
1280                 vlan->pending = false;
1281                 bridge_set_vlan_state(bst, vlan, true);
1282         }
1283 }
1284
1285 static struct device *
1286 bridge_create(const char *name, struct device_type *devtype,
1287         struct blob_attr *attr)
1288 {
1289         struct bridge_state *bst;
1290         struct device *dev = NULL;
1291
1292         bst = calloc(1, sizeof(*bst));
1293         if (!bst)
1294                 return NULL;
1295
1296         dev = &bst->dev;
1297
1298         if (device_init(dev, devtype, name) < 0) {
1299                 device_cleanup(dev);
1300                 free(bst);
1301                 return NULL;
1302         }
1303
1304         dev->config_pending = true;
1305         bst->retry.cb = bridge_retry_members;
1306
1307         bst->set_state = dev->set_state;
1308         dev->set_state = bridge_set_state;
1309
1310         dev->hotplug_ops = &bridge_ops;
1311
1312         vlist_init(&bst->members, avl_strcmp, bridge_member_update);
1313         bst->members.keep_old = true;
1314
1315         vlist_init(&dev->vlans, bridge_avl_cmp_u16, bridge_vlan_update);
1316
1317         bridge_reload(dev, attr);
1318
1319         return dev;
1320 }
1321
1322 static void __init bridge_device_type_init(void)
1323 {
1324         device_type_add(&bridge_device_type);
1325 }