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_IGMP_SNOOP,
  30         BRIDGE_ATTR_AGEING_TIME,
  31         BRIDGE_ATTR_HELLO_TIME,
  32         BRIDGE_ATTR_MAX_AGE,
  33         __BRIDGE_ATTR_MAX
  34 };
  35
  36 static const struct blobmsg_policy bridge_attrs[__BRIDGE_ATTR_MAX] = {
  37         [BRIDGE_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  38         [BRIDGE_ATTR_STP] = { "stp", BLOBMSG_TYPE_BOOL },
  39         [BRIDGE_ATTR_FORWARD_DELAY] = { "forward_delay", BLOBMSG_TYPE_INT32 },
  40         [BRIDGE_ATTR_AGEING_TIME] = { "ageing_time", BLOBMSG_TYPE_INT32 },
  41         [BRIDGE_ATTR_HELLO_TIME] = { "hello_time", BLOBMSG_TYPE_INT32 },
  42         [BRIDGE_ATTR_MAX_AGE] = { "max_age", BLOBMSG_TYPE_INT32 },
  43         [BRIDGE_ATTR_IGMP_SNOOP] = { "igmp_snooping", BLOBMSG_TYPE_BOOL },
  44 };
  45
  46 static const union config_param_info bridge_attr_info[__BRIDGE_ATTR_MAX] = {
  47         [BRIDGE_ATTR_IFNAME] = { .type = BLOBMSG_TYPE_STRING },
  48 };
  49
  50 static const struct config_param_list bridge_attr_list = {
  51         .n_params = __BRIDGE_ATTR_MAX,
  52         .params = bridge_attrs,
  53         .info = bridge_attr_info,
  54
  55         .n_next = 1,
  56         .next = { &device_attr_list },
  57 };
  58
  59 static struct device *bridge_create(const char *name, struct blob_attr *attr);
  60 static void bridge_config_init(struct device *dev);
  61 static void bridge_free(struct device *dev);
  62 static void bridge_dump_info(struct device *dev, struct blob_buf *b);
  63 enum dev_change_type
  64 bridge_reload(struct device *dev, struct blob_attr *attr);
  65
  66 const struct device_type bridge_device_type = {
  67         .name = "Bridge",
  68         .config_params = &bridge_attr_list,
  69
  70         .create = bridge_create,
  71         .config_init = bridge_config_init,
  72         .reload = bridge_reload,
  73         .free = bridge_free,
  74         .dump_info = bridge_dump_info,
  75 };
  76
  77 struct bridge_state {
  78         struct device dev;
  79         device_state_cb set_state;
  80
  81         struct blob_attr *config_data;
  82         struct bridge_config config;
  83         struct blob_attr *ifnames;
  84         bool active;
  85         bool force_active;
  86
  87         struct bridge_member *primary_port;
  88         struct vlist_tree members;
  89         int n_present;
  90 };
  91
  92 struct bridge_member {
  93         struct vlist_node node;
  94         struct bridge_state *bst;
  95         struct device_user dev;
  96         bool present;
  97         char name[];
  98 };
  99
 100 static void
 101 bridge_reset_primary(struct bridge_state *bst)
 102 {
 103         struct bridge_member *bm;
 104
 105         if (!bst->primary_port &&
 106             (bst->dev.settings.flags & DEV_OPT_MACADDR))
 107                 return;
 108
 109         bst->primary_port = NULL;
 110         bst->dev.settings.flags &= ~DEV_OPT_MACADDR;
 111         vlist_for_each_element(&bst->members, bm, node) {
 112                 if (!bm->present)
 113                         continue;
 114
 115                 bst->primary_port = bm;
 116                 memcpy(bst->dev.settings.macaddr, bm->dev.dev->settings.macaddr, 6);
 117                 bst->dev.settings.flags |= DEV_OPT_MACADDR;
 118                 return;
 119         }
 120 }
 121
 122 static int
 123 bridge_disable_member(struct bridge_member *bm)
 124 {
 125         struct bridge_state *bst = bm->bst;
 126
 127         if (!bm->present)
 128                 return 0;
 129
 130         system_bridge_delif(&bst->dev, bm->dev.dev);
 131         device_release(&bm->dev);
 132
 133         return 0;
 134 }
 135
 136 static int
 137 bridge_enable_member(struct bridge_member *bm)
 138 {
 139         struct bridge_state *bst = bm->bst;
 140         int ret;
 141
 142         if (!bm->present)
 143                 return 0;
 144
 145         ret = device_claim(&bm->dev);
 146         if (ret < 0)
 147                 goto error;
 148
 149         ret = system_bridge_addif(&bst->dev, bm->dev.dev);
 150         if (ret < 0) {
 151                 D(DEVICE, "Bridge device %s could not be added\n", bm->dev.dev->ifname);
 152                 goto error;
 153         }
 154
 155         return 0;
 156
 157 error:
 158         bm->present = false;
 159         bst->n_present--;
 160         return ret;
 161 }
 162
 163 static void
 164 bridge_remove_member(struct bridge_member *bm)
 165 {
 166         struct bridge_state *bst = bm->bst;
 167
 168         if (!bm->present)
 169                 return;
 170
 171         if (bm == bst->primary_port);
 172                 bridge_reset_primary(bst);
 173
 174         if (bst->dev.active)
 175                 bridge_disable_member(bm);
 176
 177         bm->present = false;
 178         bm->bst->n_present--;
 179
 180         bst->force_active = false;
 181         if (bst->n_present == 0)
 182                 device_set_present(&bst->dev, false);
 183 }
 184
 185 static void
 186 bridge_member_cb(struct device_user *dev, enum device_event ev)
 187 {
 188         struct bridge_member *bm = container_of(dev, struct bridge_member, dev);
 189         struct bridge_state *bst = bm->bst;
 190
 191         switch (ev) {
 192         case DEV_EVENT_ADD:
 193                 assert(!bm->present);
 194
 195                 bm->present = true;
 196                 bst->n_present++;
 197
 198                 if (bst->dev.active)
 199                         bridge_enable_member(bm);
 200                 else if (bst->n_present == 1)
 201                         device_set_present(&bst->dev, true);
 202
 203                 break;
 204         case DEV_EVENT_REMOVE:
 205                 if (dev->hotplug) {
 206                         vlist_delete(&bst->members, &bm->node);
 207                         return;
 208                 }
 209
 210                 if (bm->present)
 211                         bridge_remove_member(bm);
 212
 213                 break;
 214         default:
 215                 return;
 216         }
 217 }
 218
 219 static int
 220 bridge_set_down(struct bridge_state *bst)
 221 {
 222         struct bridge_member *bm;
 223
 224         bst->set_state(&bst->dev, false);
 225
 226         vlist_for_each_element(&bst->members, bm, node)
 227                 bridge_disable_member(bm);
 228
 229         system_bridge_delbr(&bst->dev);
 230
 231         return 0;
 232 }
 233
 234 static int
 235 bridge_set_up(struct bridge_state *bst)
 236 {
 237         struct bridge_member *bm;
 238         int ret;
 239
 240         if (!bst->force_active && !bst->n_present)
 241                 return -ENOENT;
 242
 243         ret = system_bridge_addbr(&bst->dev, &bst->config);
 244         if (ret < 0)
 245                 goto out;
 246
 247         vlist_for_each_element(&bst->members, bm, node)
 248                 bridge_enable_member(bm);
 249
 250         if (!bst->force_active && !bst->n_present) {
 251                 /* initialization of all member interfaces failed */
 252                 system_bridge_delbr(&bst->dev);
 253                 device_set_present(&bst->dev, false);
 254                 return -ENOENT;
 255         }
 256
 257         bridge_reset_primary(bst);
 258         ret = bst->set_state(&bst->dev, true);
 259         if (ret < 0)
 260                 bridge_set_down(bst);
 261
 262 out:
 263         return ret;
 264 }
 265
 266 static int
 267 bridge_set_state(struct device *dev, bool up)
 268 {
 269         struct bridge_state *bst;
 270
 271         bst = container_of(dev, struct bridge_state, dev);
 272
 273         if (up)
 274                 return bridge_set_up(bst);
 275         else
 276                 return bridge_set_down(bst);
 277 }
 278
 279 static struct bridge_member *
 280 bridge_create_member(struct bridge_state *bst, struct device *dev, bool hotplug)
 281 {
 282         struct bridge_member *bm;
 283
 284         bm = calloc(1, sizeof(*bm) + strlen(dev->ifname) + 1);
 285         bm->bst = bst;
 286         bm->dev.cb = bridge_member_cb;
 287         bm->dev.hotplug = hotplug;
 288         strcpy(bm->name, dev->ifname);
 289         bm->dev.dev = dev;
 290         vlist_add(&bst->members, &bm->node, bm->name);
 291         if (hotplug)
 292                 bm->node.version = -1;
 293
 294         return bm;
 295 }
 296
 297 static void
 298 bridge_member_update(struct vlist_tree *tree, struct vlist_node *node_new,
 299                      struct vlist_node *node_old)
 300 {
 301         struct bridge_member *bm;
 302         struct device *dev;
 303
 304         if (node_new) {
 305                 bm = container_of(node_new, struct bridge_member, node);
 306
 307                 if (node_old) {
 308                         free(bm);
 309                         return;
 310                 }
 311
 312                 dev = bm->dev.dev;
 313                 bm->dev.dev = NULL;
 314                 device_add_user(&bm->dev, dev);
 315         }
 316
 317
 318         if (node_old) {
 319                 bm = container_of(node_old, struct bridge_member, node);
 320                 bridge_remove_member(bm);
 321                 device_remove_user(&bm->dev);
 322                 free(bm);
 323         }
 324 }
 325
 326
 327 static void
 328 bridge_add_member(struct bridge_state *bst, const char *name)
 329 {
 330         struct device *dev;
 331
 332         dev = device_get(name, true);
 333         if (!dev)
 334                 return;
 335
 336         bridge_create_member(bst, dev, false);
 337 }
 338
 339 static int
 340 bridge_hotplug_add(struct device *dev, struct device *member)
 341 {
 342         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 343
 344         bridge_create_member(bst, member, true);
 345
 346         return 0;
 347 }
 348
 349 static int
 350 bridge_hotplug_del(struct device *dev, struct device *member)
 351 {
 352         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 353         struct bridge_member *bm;
 354
 355         bm = vlist_find(&bst->members, member->ifname, bm, node);
 356         if (!bm)
 357                 return UBUS_STATUS_NOT_FOUND;
 358
 359         vlist_delete(&bst->members, &bm->node);
 360         return 0;
 361 }
 362
 363 static int
 364 bridge_hotplug_prepare(struct device *dev)
 365 {
 366         struct bridge_state *bst;
 367
 368         bst = container_of(dev, struct bridge_state, dev);
 369         bst->force_active = true;
 370         device_set_present(&bst->dev, true);
 371
 372         return 0;
 373 }
 374
 375 static const struct device_hotplug_ops bridge_ops = {
 376         .prepare = bridge_hotplug_prepare,
 377         .add = bridge_hotplug_add,
 378         .del = bridge_hotplug_del
 379 };
 380
 381 static void
 382 bridge_free(struct device *dev)
 383 {
 384         struct bridge_state *bst;
 385
 386         bst = container_of(dev, struct bridge_state, dev);
 387         vlist_flush_all(&bst->members);
 388         free(bst);
 389 }
 390
 391 static void
 392 bridge_dump_info(struct device *dev, struct blob_buf *b)
 393 {
 394         struct bridge_state *bst;
 395         struct bridge_member *bm;
 396         void *list;
 397
 398         bst = container_of(dev, struct bridge_state, dev);
 399
 400         system_if_dump_info(dev, b);
 401         list = blobmsg_open_array(b, "bridge-members");
 402
 403         vlist_for_each_element(&bst->members, bm, node)
 404                 blobmsg_add_string(b, NULL, bm->dev.dev->ifname);
 405
 406         blobmsg_close_array(b, list);
 407 }
 408
 409 static void
 410 bridge_config_init(struct device *dev)
 411 {
 412         struct bridge_state *bst;
 413         struct blob_attr *cur;
 414         int rem;
 415
 416         bst = container_of(dev, struct bridge_state, dev);
 417
 418         if (!bst->ifnames)
 419                 return;
 420
 421         vlist_update(&bst->members);
 422         blobmsg_for_each_attr(cur, bst->ifnames, rem) {
 423                 bridge_add_member(bst, blobmsg_data(cur));
 424         }
 425         vlist_flush(&bst->members);
 426 }
 427
 428 static void
 429 bridge_apply_settings(struct bridge_state *bst, struct blob_attr **tb)
 430 {
 431         struct bridge_config *cfg = &bst->config;
 432         struct blob_attr *cur;
 433
 434         /* defaults */
 435         cfg->stp = false;
 436         cfg->forward_delay = 2;
 437         cfg->igmp_snoop = true;
 438
 439         if ((cur = tb[BRIDGE_ATTR_STP]))
 440                 cfg->stp = blobmsg_get_bool(cur);
 441
 442         if ((cur = tb[BRIDGE_ATTR_FORWARD_DELAY]))
 443                 cfg->forward_delay = blobmsg_get_u32(cur);
 444
 445         if ((cur = tb[BRIDGE_ATTR_IGMP_SNOOP]))
 446                 cfg->igmp_snoop = blobmsg_get_bool(cur);
 447
 448         if ((cur = tb[BRIDGE_ATTR_AGEING_TIME])) {
 449                 cfg->ageing_time = blobmsg_get_u32(cur);
 450                 cfg->flags |= BRIDGE_OPT_AGEING_TIME;
 451         }
 452
 453         if ((cur = tb[BRIDGE_ATTR_HELLO_TIME])) {
 454                 cfg->hello_time = blobmsg_get_u32(cur);
 455                 cfg->flags |= BRIDGE_OPT_HELLO_TIME;
 456         }
 457
 458         if ((cur = tb[BRIDGE_ATTR_MAX_AGE])) {
 459                 cfg->max_age = blobmsg_get_u32(cur);
 460                 cfg->flags |= BRIDGE_OPT_MAX_AGE;
 461         }
 462 }
 463
 464 enum dev_change_type
 465 bridge_reload(struct device *dev, struct blob_attr *attr)
 466 {
 467         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 468         struct blob_attr *tb_br[__BRIDGE_ATTR_MAX];
 469         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 470         unsigned long diff;
 471         struct bridge_state *bst;
 472
 473         BUILD_BUG_ON(sizeof(diff) < __BRIDGE_ATTR_MAX / 8);
 474         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
 475
 476         bst = container_of(dev, struct bridge_state, dev);
 477
 478         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 479                 blob_data(attr), blob_len(attr));
 480         blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, tb_br,
 481                 blob_data(attr), blob_len(attr));
 482
 483         bst->ifnames = tb_br[BRIDGE_ATTR_IFNAME];
 484         device_init_settings(dev, tb_dev);
 485         bridge_apply_settings(bst, tb_br);
 486
 487         if (bst->config_data) {
 488                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 489                 struct blob_attr *otb_br[__BRIDGE_ATTR_MAX];
 490
 491                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 492                         blob_data(bst->config_data), blob_len(bst->config_data));
 493
 494                 diff = 0;
 495                 config_diff(tb_dev, otb_dev, &device_attr_list, &diff);
 496                 if (diff & ~(1 << DEV_ATTR_IFNAME))
 497                     ret = DEV_CONFIG_RESTART;
 498
 499                 blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, otb_br,
 500                         blob_data(bst->config_data), blob_len(bst->config_data));
 501
 502                 diff = 0;
 503                 config_diff(tb_br, otb_br, &bridge_attr_list, &diff);
 504                 if (diff & ~(1 << BRIDGE_ATTR_IFNAME))
 505                     ret = DEV_CONFIG_RESTART;
 506
 507                 bridge_config_init(dev);
 508         }
 509
 510         bst->config_data = attr;
 511         return ret;
 512 }
 513
 514 static struct device *
 515 bridge_create(const char *name, struct blob_attr *attr)
 516 {
 517         struct bridge_state *bst;
 518         struct device *dev = NULL;
 519
 520         bst = calloc(1, sizeof(*bst));
 521         if (!bst)
 522                 return NULL;
 523
 524         dev = &bst->dev;
 525         device_init(dev, &bridge_device_type, name);
 526         dev->config_pending = true;
 527
 528         bst->set_state = dev->set_state;
 529         dev->set_state = bridge_set_state;
 530
 531         dev->hotplug_ops = &bridge_ops;
 532
 533         vlist_init(&bst->members, avl_strcmp, bridge_member_update);
 534         bst->members.keep_old = true;
 535         bridge_reload(dev, attr);
 536
 537         return dev;
 538 }
 539
 540