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                 uint8_t *macaddr;
 113
 114                 if (!bm->present)
 115                         continue;
 116
 117                 bst->primary_port = bm;
 118                 if (bm->dev.dev->settings.flags & DEV_OPT_MACADDR)
 119                         macaddr = bm->dev.dev->settings.macaddr;
 120                 else
 121                         macaddr = bm->dev.dev->orig_settings.macaddr;
 122                 memcpy(bst->dev.settings.macaddr, macaddr, 6);
 123                 bst->dev.settings.flags |= DEV_OPT_MACADDR;
 124                 return;
 125         }
 126 }
 127
 128 static int
 129 bridge_disable_member(struct bridge_member *bm)
 130 {
 131         struct bridge_state *bst = bm->bst;
 132
 133         if (!bm->present)
 134                 return 0;
 135
 136         system_bridge_delif(&bst->dev, bm->dev.dev);
 137         device_release(&bm->dev);
 138
 139         return 0;
 140 }
 141
 142 static int
 143 bridge_enable_member(struct bridge_member *bm)
 144 {
 145         struct bridge_state *bst = bm->bst;
 146         int ret;
 147
 148         if (!bm->present)
 149                 return 0;
 150
 151         ret = device_claim(&bm->dev);
 152         if (ret < 0)
 153                 goto error;
 154
 155         ret = system_bridge_addif(&bst->dev, bm->dev.dev);
 156         if (ret < 0) {
 157                 D(DEVICE, "Bridge device %s could not be added\n", bm->dev.dev->ifname);
 158                 goto error;
 159         }
 160
 161         return 0;
 162
 163 error:
 164         bm->present = false;
 165         bst->n_present--;
 166         return ret;
 167 }
 168
 169 static void
 170 bridge_remove_member(struct bridge_member *bm)
 171 {
 172         struct bridge_state *bst = bm->bst;
 173
 174         if (!bm->present)
 175                 return;
 176
 177         if (bm == bst->primary_port);
 178                 bridge_reset_primary(bst);
 179
 180         if (bst->dev.active)
 181                 bridge_disable_member(bm);
 182
 183         bm->present = false;
 184         bm->bst->n_present--;
 185
 186         bst->force_active = false;
 187         if (bst->n_present == 0)
 188                 device_set_present(&bst->dev, false);
 189 }
 190
 191 static void
 192 bridge_member_cb(struct device_user *dev, enum device_event ev)
 193 {
 194         struct bridge_member *bm = container_of(dev, struct bridge_member, dev);
 195         struct bridge_state *bst = bm->bst;
 196
 197         switch (ev) {
 198         case DEV_EVENT_ADD:
 199                 assert(!bm->present);
 200
 201                 bm->present = true;
 202                 bst->n_present++;
 203
 204                 if (bst->dev.active)
 205                         bridge_enable_member(bm);
 206                 else if (bst->n_present == 1)
 207                         device_set_present(&bst->dev, true);
 208
 209                 break;
 210         case DEV_EVENT_REMOVE:
 211                 if (dev->hotplug) {
 212                         vlist_delete(&bst->members, &bm->node);
 213                         return;
 214                 }
 215
 216                 if (bm->present)
 217                         bridge_remove_member(bm);
 218
 219                 break;
 220         default:
 221                 return;
 222         }
 223 }
 224
 225 static int
 226 bridge_set_down(struct bridge_state *bst)
 227 {
 228         struct bridge_member *bm;
 229
 230         bst->set_state(&bst->dev, false);
 231
 232         vlist_for_each_element(&bst->members, bm, node)
 233                 bridge_disable_member(bm);
 234
 235         system_bridge_delbr(&bst->dev);
 236
 237         return 0;
 238 }
 239
 240 static int
 241 bridge_set_up(struct bridge_state *bst)
 242 {
 243         struct bridge_member *bm;
 244         int ret;
 245
 246         if (!bst->force_active && !bst->n_present)
 247                 return -ENOENT;
 248
 249         ret = system_bridge_addbr(&bst->dev, &bst->config);
 250         if (ret < 0)
 251                 goto out;
 252
 253         vlist_for_each_element(&bst->members, bm, node)
 254                 bridge_enable_member(bm);
 255
 256         if (!bst->force_active && !bst->n_present) {
 257                 /* initialization of all member interfaces failed */
 258                 system_bridge_delbr(&bst->dev);
 259                 device_set_present(&bst->dev, false);
 260                 return -ENOENT;
 261         }
 262
 263         bridge_reset_primary(bst);
 264         ret = bst->set_state(&bst->dev, true);
 265         if (ret < 0)
 266                 bridge_set_down(bst);
 267
 268 out:
 269         return ret;
 270 }
 271
 272 static int
 273 bridge_set_state(struct device *dev, bool up)
 274 {
 275         struct bridge_state *bst;
 276
 277         bst = container_of(dev, struct bridge_state, dev);
 278
 279         if (up)
 280                 return bridge_set_up(bst);
 281         else
 282                 return bridge_set_down(bst);
 283 }
 284
 285 static struct bridge_member *
 286 bridge_create_member(struct bridge_state *bst, struct device *dev, bool hotplug)
 287 {
 288         struct bridge_member *bm;
 289
 290         bm = calloc(1, sizeof(*bm) + strlen(dev->ifname) + 1);
 291         bm->bst = bst;
 292         bm->dev.cb = bridge_member_cb;
 293         bm->dev.hotplug = hotplug;
 294         strcpy(bm->name, dev->ifname);
 295         bm->dev.dev = dev;
 296         vlist_add(&bst->members, &bm->node, bm->name);
 297         if (hotplug)
 298                 bm->node.version = -1;
 299
 300         return bm;
 301 }
 302
 303 static void
 304 bridge_member_update(struct vlist_tree *tree, struct vlist_node *node_new,
 305                      struct vlist_node *node_old)
 306 {
 307         struct bridge_member *bm;
 308         struct device *dev;
 309
 310         if (node_new) {
 311                 bm = container_of(node_new, struct bridge_member, node);
 312
 313                 if (node_old) {
 314                         free(bm);
 315                         return;
 316                 }
 317
 318                 dev = bm->dev.dev;
 319                 bm->dev.dev = NULL;
 320                 device_add_user(&bm->dev, dev);
 321         }
 322
 323
 324         if (node_old) {
 325                 bm = container_of(node_old, struct bridge_member, node);
 326                 bridge_remove_member(bm);
 327                 device_remove_user(&bm->dev);
 328                 free(bm);
 329         }
 330 }
 331
 332
 333 static void
 334 bridge_add_member(struct bridge_state *bst, const char *name)
 335 {
 336         struct device *dev;
 337
 338         dev = device_get(name, true);
 339         if (!dev)
 340                 return;
 341
 342         bridge_create_member(bst, dev, false);
 343 }
 344
 345 static int
 346 bridge_hotplug_add(struct device *dev, struct device *member)
 347 {
 348         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 349
 350         bridge_create_member(bst, member, true);
 351
 352         return 0;
 353 }
 354
 355 static int
 356 bridge_hotplug_del(struct device *dev, struct device *member)
 357 {
 358         struct bridge_state *bst = container_of(dev, struct bridge_state, dev);
 359         struct bridge_member *bm;
 360
 361         bm = vlist_find(&bst->members, member->ifname, bm, node);
 362         if (!bm)
 363                 return UBUS_STATUS_NOT_FOUND;
 364
 365         vlist_delete(&bst->members, &bm->node);
 366         return 0;
 367 }
 368
 369 static int
 370 bridge_hotplug_prepare(struct device *dev)
 371 {
 372         struct bridge_state *bst;
 373
 374         bst = container_of(dev, struct bridge_state, dev);
 375         bst->force_active = true;
 376         device_set_present(&bst->dev, true);
 377
 378         return 0;
 379 }
 380
 381 static const struct device_hotplug_ops bridge_ops = {
 382         .prepare = bridge_hotplug_prepare,
 383         .add = bridge_hotplug_add,
 384         .del = bridge_hotplug_del
 385 };
 386
 387 static void
 388 bridge_free(struct device *dev)
 389 {
 390         struct bridge_state *bst;
 391
 392         bst = container_of(dev, struct bridge_state, dev);
 393         vlist_flush_all(&bst->members);
 394         free(bst);
 395 }
 396
 397 static void
 398 bridge_dump_info(struct device *dev, struct blob_buf *b)
 399 {
 400         struct bridge_state *bst;
 401         struct bridge_member *bm;
 402         void *list;
 403
 404         bst = container_of(dev, struct bridge_state, dev);
 405
 406         system_if_dump_info(dev, b);
 407         list = blobmsg_open_array(b, "bridge-members");
 408
 409         vlist_for_each_element(&bst->members, bm, node)
 410                 blobmsg_add_string(b, NULL, bm->dev.dev->ifname);
 411
 412         blobmsg_close_array(b, list);
 413 }
 414
 415 static void
 416 bridge_config_init(struct device *dev)
 417 {
 418         struct bridge_state *bst;
 419         struct blob_attr *cur;
 420         int rem;
 421
 422         bst = container_of(dev, struct bridge_state, dev);
 423
 424         if (!bst->ifnames)
 425                 return;
 426
 427         vlist_update(&bst->members);
 428         blobmsg_for_each_attr(cur, bst->ifnames, rem) {
 429                 bridge_add_member(bst, blobmsg_data(cur));
 430         }
 431         vlist_flush(&bst->members);
 432 }
 433
 434 static void
 435 bridge_apply_settings(struct bridge_state *bst, struct blob_attr **tb)
 436 {
 437         struct bridge_config *cfg = &bst->config;
 438         struct blob_attr *cur;
 439
 440         /* defaults */
 441         cfg->stp = false;
 442         cfg->forward_delay = 2;
 443         cfg->igmp_snoop = true;
 444
 445         if ((cur = tb[BRIDGE_ATTR_STP]))
 446                 cfg->stp = blobmsg_get_bool(cur);
 447
 448         if ((cur = tb[BRIDGE_ATTR_FORWARD_DELAY]))
 449                 cfg->forward_delay = blobmsg_get_u32(cur);
 450
 451         if ((cur = tb[BRIDGE_ATTR_IGMP_SNOOP]))
 452                 cfg->igmp_snoop = blobmsg_get_bool(cur);
 453
 454         if ((cur = tb[BRIDGE_ATTR_AGEING_TIME])) {
 455                 cfg->ageing_time = blobmsg_get_u32(cur);
 456                 cfg->flags |= BRIDGE_OPT_AGEING_TIME;
 457         }
 458
 459         if ((cur = tb[BRIDGE_ATTR_HELLO_TIME])) {
 460                 cfg->hello_time = blobmsg_get_u32(cur);
 461                 cfg->flags |= BRIDGE_OPT_HELLO_TIME;
 462         }
 463
 464         if ((cur = tb[BRIDGE_ATTR_MAX_AGE])) {
 465                 cfg->max_age = blobmsg_get_u32(cur);
 466                 cfg->flags |= BRIDGE_OPT_MAX_AGE;
 467         }
 468 }
 469
 470 enum dev_change_type
 471 bridge_reload(struct device *dev, struct blob_attr *attr)
 472 {
 473         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 474         struct blob_attr *tb_br[__BRIDGE_ATTR_MAX];
 475         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 476         unsigned long diff;
 477         struct bridge_state *bst;
 478
 479         BUILD_BUG_ON(sizeof(diff) < __BRIDGE_ATTR_MAX / 8);
 480         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
 481
 482         bst = container_of(dev, struct bridge_state, dev);
 483
 484         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 485                 blob_data(attr), blob_len(attr));
 486         blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, tb_br,
 487                 blob_data(attr), blob_len(attr));
 488
 489         bst->ifnames = tb_br[BRIDGE_ATTR_IFNAME];
 490         device_init_settings(dev, tb_dev);
 491         bridge_apply_settings(bst, tb_br);
 492
 493         if (bst->config_data) {
 494                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 495                 struct blob_attr *otb_br[__BRIDGE_ATTR_MAX];
 496
 497                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 498                         blob_data(bst->config_data), blob_len(bst->config_data));
 499
 500                 diff = 0;
 501                 config_diff(tb_dev, otb_dev, &device_attr_list, &diff);
 502                 if (diff & ~(1 << DEV_ATTR_IFNAME))
 503                     ret = DEV_CONFIG_RESTART;
 504
 505                 blobmsg_parse(bridge_attrs, __BRIDGE_ATTR_MAX, otb_br,
 506                         blob_data(bst->config_data), blob_len(bst->config_data));
 507
 508                 diff = 0;
 509                 config_diff(tb_br, otb_br, &bridge_attr_list, &diff);
 510                 if (diff & ~(1 << BRIDGE_ATTR_IFNAME))
 511                     ret = DEV_CONFIG_RESTART;
 512
 513                 bridge_config_init(dev);
 514         }
 515
 516         bst->config_data = attr;
 517         return ret;
 518 }
 519
 520 static struct device *
 521 bridge_create(const char *name, struct blob_attr *attr)
 522 {
 523         struct bridge_state *bst;
 524         struct device *dev = NULL;
 525
 526         bst = calloc(1, sizeof(*bst));
 527         if (!bst)
 528                 return NULL;
 529
 530         dev = &bst->dev;
 531         device_init(dev, &bridge_device_type, name);
 532         dev->config_pending = true;
 533
 534         bst->set_state = dev->set_state;
 535         dev->set_state = bridge_set_state;
 536
 537         dev->hotplug_ops = &bridge_ops;
 538
 539         vlist_init(&bst->members, avl_strcmp, bridge_member_update);
 540         bst->members.keep_old = true;
 541         bridge_reload(dev, attr);
 542
 543         return dev;
 544 }
 545
 546