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