net/bridge/br_sysfs_br.c

   1 /*
   2  *      Sysfs attributes of bridge
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Stephen Hemminger               <shemminger@osdl.org>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/capability.h>
  15 #include <linux/kernel.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/if_bridge.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/times.h>
  22
  23 #include "br_private.h"
  24
  25 #define to_bridge(cd)   ((struct net_bridge *)netdev_priv(to_net_dev(cd)))
  26
  27 /*
  28  * Common code for storing bridge parameters.
  29  */
  30 static ssize_t store_bridge_parm(struct device *d,
  31                                  const char *buf, size_t len,
  32                                  int (*set)(struct net_bridge *, unsigned long))
  33 {
  34         struct net_bridge *br = to_bridge(d);
  35         char *endp;
  36         unsigned long val;
  37         int err;
  38
  39         if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
  40                 return -EPERM;
  41
  42         val = simple_strtoul(buf, &endp, 0);
  43         if (endp == buf)
  44                 return -EINVAL;
  45
  46         if (!rtnl_trylock())
  47                 return restart_syscall();
  48
  49         err = (*set)(br, val);
  50         if (!err)
  51                 netdev_state_change(br->dev);
  52         rtnl_unlock();
  53
  54         return err ? err : len;
  55 }
  56
  57
  58 static ssize_t forward_delay_show(struct device *d,
  59                                   struct device_attribute *attr, char *buf)
  60 {
  61         struct net_bridge *br = to_bridge(d);
  62         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
  63 }
  64
  65 static ssize_t forward_delay_store(struct device *d,
  66                                    struct device_attribute *attr,
  67                                    const char *buf, size_t len)
  68 {
  69         return store_bridge_parm(d, buf, len, br_set_forward_delay);
  70 }
  71 static DEVICE_ATTR_RW(forward_delay);
  72
  73 static ssize_t hello_time_show(struct device *d, struct device_attribute *attr,
  74                                char *buf)
  75 {
  76         return sprintf(buf, "%lu\n",
  77                        jiffies_to_clock_t(to_bridge(d)->hello_time));
  78 }
  79
  80 static ssize_t hello_time_store(struct device *d,
  81                                 struct device_attribute *attr, const char *buf,
  82                                 size_t len)
  83 {
  84         return store_bridge_parm(d, buf, len, br_set_hello_time);
  85 }
  86 static DEVICE_ATTR_RW(hello_time);
  87
  88 static ssize_t max_age_show(struct device *d, struct device_attribute *attr,
  89                             char *buf)
  90 {
  91         return sprintf(buf, "%lu\n",
  92                        jiffies_to_clock_t(to_bridge(d)->max_age));
  93 }
  94
  95 static ssize_t max_age_store(struct device *d, struct device_attribute *attr,
  96                              const char *buf, size_t len)
  97 {
  98         return store_bridge_parm(d, buf, len, br_set_max_age);
  99 }
 100 static DEVICE_ATTR_RW(max_age);
 101
 102 static ssize_t ageing_time_show(struct device *d,
 103                                 struct device_attribute *attr, char *buf)
 104 {
 105         struct net_bridge *br = to_bridge(d);
 106         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 107 }
 108
 109 static int set_ageing_time(struct net_bridge *br, unsigned long val)
 110 {
 111         return br_set_ageing_time(br, val);
 112 }
 113
 114 static ssize_t ageing_time_store(struct device *d,
 115                                  struct device_attribute *attr,
 116                                  const char *buf, size_t len)
 117 {
 118         return store_bridge_parm(d, buf, len, set_ageing_time);
 119 }
 120 static DEVICE_ATTR_RW(ageing_time);
 121
 122 static ssize_t stp_state_show(struct device *d,
 123                               struct device_attribute *attr, char *buf)
 124 {
 125         struct net_bridge *br = to_bridge(d);
 126         return sprintf(buf, "%d\n", br->stp_enabled);
 127 }
 128
 129
 130 static int set_stp_state(struct net_bridge *br, unsigned long val)
 131 {
 132         br_stp_set_enabled(br, val);
 133
 134         return 0;
 135 }
 136
 137 static ssize_t stp_state_store(struct device *d,
 138                                struct device_attribute *attr, const char *buf,
 139                                size_t len)
 140 {
 141         return store_bridge_parm(d, buf, len, set_stp_state);
 142 }
 143 static DEVICE_ATTR_RW(stp_state);
 144
 145 static ssize_t group_fwd_mask_show(struct device *d,
 146                                    struct device_attribute *attr,
 147                                    char *buf)
 148 {
 149         struct net_bridge *br = to_bridge(d);
 150         return sprintf(buf, "%#x\n", br->group_fwd_mask);
 151 }
 152
 153 static int set_group_fwd_mask(struct net_bridge *br, unsigned long val)
 154 {
 155         if (val & BR_GROUPFWD_RESTRICTED)
 156                 return -EINVAL;
 157
 158         br->group_fwd_mask = val;
 159
 160         return 0;
 161 }
 162
 163 static ssize_t group_fwd_mask_store(struct device *d,
 164                                     struct device_attribute *attr,
 165                                     const char *buf,
 166                                     size_t len)
 167 {
 168         return store_bridge_parm(d, buf, len, set_group_fwd_mask);
 169 }
 170 static DEVICE_ATTR_RW(group_fwd_mask);
 171
 172 static ssize_t priority_show(struct device *d, struct device_attribute *attr,
 173                              char *buf)
 174 {
 175         struct net_bridge *br = to_bridge(d);
 176         return sprintf(buf, "%d\n",
 177                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 178 }
 179
 180 static int set_priority(struct net_bridge *br, unsigned long val)
 181 {
 182         br_stp_set_bridge_priority(br, (u16) val);
 183         return 0;
 184 }
 185
 186 static ssize_t priority_store(struct device *d, struct device_attribute *attr,
 187                               const char *buf, size_t len)
 188 {
 189         return store_bridge_parm(d, buf, len, set_priority);
 190 }
 191 static DEVICE_ATTR_RW(priority);
 192
 193 static ssize_t root_id_show(struct device *d, struct device_attribute *attr,
 194                             char *buf)
 195 {
 196         return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
 197 }
 198 static DEVICE_ATTR_RO(root_id);
 199
 200 static ssize_t bridge_id_show(struct device *d, struct device_attribute *attr,
 201                               char *buf)
 202 {
 203         return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
 204 }
 205 static DEVICE_ATTR_RO(bridge_id);
 206
 207 static ssize_t root_port_show(struct device *d, struct device_attribute *attr,
 208                               char *buf)
 209 {
 210         return sprintf(buf, "%d\n", to_bridge(d)->root_port);
 211 }
 212 static DEVICE_ATTR_RO(root_port);
 213
 214 static ssize_t root_path_cost_show(struct device *d,
 215                                    struct device_attribute *attr, char *buf)
 216 {
 217         return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
 218 }
 219 static DEVICE_ATTR_RO(root_path_cost);
 220
 221 static ssize_t topology_change_show(struct device *d,
 222                                     struct device_attribute *attr, char *buf)
 223 {
 224         return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
 225 }
 226 static DEVICE_ATTR_RO(topology_change);
 227
 228 static ssize_t topology_change_detected_show(struct device *d,
 229                                              struct device_attribute *attr,
 230                                              char *buf)
 231 {
 232         struct net_bridge *br = to_bridge(d);
 233         return sprintf(buf, "%d\n", br->topology_change_detected);
 234 }
 235 static DEVICE_ATTR_RO(topology_change_detected);
 236
 237 static ssize_t hello_timer_show(struct device *d,
 238                                 struct device_attribute *attr, char *buf)
 239 {
 240         struct net_bridge *br = to_bridge(d);
 241         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
 242 }
 243 static DEVICE_ATTR_RO(hello_timer);
 244
 245 static ssize_t tcn_timer_show(struct device *d, struct device_attribute *attr,
 246                               char *buf)
 247 {
 248         struct net_bridge *br = to_bridge(d);
 249         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
 250 }
 251 static DEVICE_ATTR_RO(tcn_timer);
 252
 253 static ssize_t topology_change_timer_show(struct device *d,
 254                                           struct device_attribute *attr,
 255                                           char *buf)
 256 {
 257         struct net_bridge *br = to_bridge(d);
 258         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
 259 }
 260 static DEVICE_ATTR_RO(topology_change_timer);
 261
 262 static ssize_t gc_timer_show(struct device *d, struct device_attribute *attr,
 263                              char *buf)
 264 {
 265         struct net_bridge *br = to_bridge(d);
 266         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
 267 }
 268 static DEVICE_ATTR_RO(gc_timer);
 269
 270 static ssize_t group_addr_show(struct device *d,
 271                                struct device_attribute *attr, char *buf)
 272 {
 273         struct net_bridge *br = to_bridge(d);
 274         return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
 275                        br->group_addr[0], br->group_addr[1],
 276                        br->group_addr[2], br->group_addr[3],
 277                        br->group_addr[4], br->group_addr[5]);
 278 }
 279
 280 static ssize_t group_addr_store(struct device *d,
 281                                 struct device_attribute *attr,
 282                                 const char *buf, size_t len)
 283 {
 284         struct net_bridge *br = to_bridge(d);
 285         u8 new_addr[6];
 286         int i;
 287
 288         if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
 289                 return -EPERM;
 290
 291         if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 292                    &new_addr[0], &new_addr[1], &new_addr[2],
 293                    &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
 294                 return -EINVAL;
 295
 296         if (!is_link_local_ether_addr(new_addr))
 297                 return -EINVAL;
 298
 299         if (new_addr[5] == 1 ||         /* 802.3x Pause address */
 300             new_addr[5] == 2 ||         /* 802.3ad Slow protocols */
 301             new_addr[5] == 3)           /* 802.1X PAE address */
 302                 return -EINVAL;
 303
 304         if (!rtnl_trylock())
 305                 return restart_syscall();
 306
 307         spin_lock_bh(&br->lock);
 308         for (i = 0; i < 6; i++)
 309                 br->group_addr[i] = new_addr[i];
 310         spin_unlock_bh(&br->lock);
 311
 312         br->group_addr_set = true;
 313         br_recalculate_fwd_mask(br);
 314         netdev_state_change(br->dev);
 315
 316         rtnl_unlock();
 317
 318         return len;
 319 }
 320
 321 static DEVICE_ATTR_RW(group_addr);
 322
 323 static int set_flush(struct net_bridge *br, unsigned long val)
 324 {
 325         br_fdb_flush(br);
 326         return 0;
 327 }
 328
 329 static ssize_t flush_store(struct device *d,
 330                            struct device_attribute *attr,
 331                            const char *buf, size_t len)
 332 {
 333         return store_bridge_parm(d, buf, len, set_flush);
 334 }
 335 static DEVICE_ATTR_WO(flush);
 336
 337 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 338 static ssize_t multicast_router_show(struct device *d,
 339                                      struct device_attribute *attr, char *buf)
 340 {
 341         struct net_bridge *br = to_bridge(d);
 342         return sprintf(buf, "%d\n", br->multicast_router);
 343 }
 344
 345 static ssize_t multicast_router_store(struct device *d,
 346                                       struct device_attribute *attr,
 347                                       const char *buf, size_t len)
 348 {
 349         return store_bridge_parm(d, buf, len, br_multicast_set_router);
 350 }
 351 static DEVICE_ATTR_RW(multicast_router);
 352
 353 static ssize_t multicast_snooping_show(struct device *d,
 354                                        struct device_attribute *attr,
 355                                        char *buf)
 356 {
 357         struct net_bridge *br = to_bridge(d);
 358         return sprintf(buf, "%d\n", !br->multicast_disabled);
 359 }
 360
 361 static ssize_t multicast_snooping_store(struct device *d,
 362                                         struct device_attribute *attr,
 363                                         const char *buf, size_t len)
 364 {
 365         return store_bridge_parm(d, buf, len, br_multicast_toggle);
 366 }
 367 static DEVICE_ATTR_RW(multicast_snooping);
 368
 369 static ssize_t multicast_query_use_ifaddr_show(struct device *d,
 370                                                struct device_attribute *attr,
 371                                                char *buf)
 372 {
 373         struct net_bridge *br = to_bridge(d);
 374         return sprintf(buf, "%d\n", br->multicast_query_use_ifaddr);
 375 }
 376
 377 static int set_query_use_ifaddr(struct net_bridge *br, unsigned long val)
 378 {
 379         br->multicast_query_use_ifaddr = !!val;
 380         return 0;
 381 }
 382
 383 static ssize_t
 384 multicast_query_use_ifaddr_store(struct device *d,
 385                                  struct device_attribute *attr,
 386                                  const char *buf, size_t len)
 387 {
 388         return store_bridge_parm(d, buf, len, set_query_use_ifaddr);
 389 }
 390 static DEVICE_ATTR_RW(multicast_query_use_ifaddr);
 391
 392 static ssize_t multicast_querier_show(struct device *d,
 393                                       struct device_attribute *attr,
 394                                       char *buf)
 395 {
 396         struct net_bridge *br = to_bridge(d);
 397         return sprintf(buf, "%d\n", br->multicast_querier);
 398 }
 399
 400 static ssize_t multicast_querier_store(struct device *d,
 401                                        struct device_attribute *attr,
 402                                        const char *buf, size_t len)
 403 {
 404         return store_bridge_parm(d, buf, len, br_multicast_set_querier);
 405 }
 406 static DEVICE_ATTR_RW(multicast_querier);
 407
 408 static ssize_t hash_elasticity_show(struct device *d,
 409                                     struct device_attribute *attr, char *buf)
 410 {
 411         struct net_bridge *br = to_bridge(d);
 412         return sprintf(buf, "%u\n", br->hash_elasticity);
 413 }
 414
 415 static int set_elasticity(struct net_bridge *br, unsigned long val)
 416 {
 417         br->hash_elasticity = val;
 418         return 0;
 419 }
 420
 421 static ssize_t hash_elasticity_store(struct device *d,
 422                                      struct device_attribute *attr,
 423                                      const char *buf, size_t len)
 424 {
 425         return store_bridge_parm(d, buf, len, set_elasticity);
 426 }
 427 static DEVICE_ATTR_RW(hash_elasticity);
 428
 429 static ssize_t hash_max_show(struct device *d, struct device_attribute *attr,
 430                              char *buf)
 431 {
 432         struct net_bridge *br = to_bridge(d);
 433         return sprintf(buf, "%u\n", br->hash_max);
 434 }
 435
 436 static ssize_t hash_max_store(struct device *d, struct device_attribute *attr,
 437                               const char *buf, size_t len)
 438 {
 439         return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
 440 }
 441 static DEVICE_ATTR_RW(hash_max);
 442
 443 static ssize_t multicast_last_member_count_show(struct device *d,
 444                                                 struct device_attribute *attr,
 445                                                 char *buf)
 446 {
 447         struct net_bridge *br = to_bridge(d);
 448         return sprintf(buf, "%u\n", br->multicast_last_member_count);
 449 }
 450
 451 static int set_last_member_count(struct net_bridge *br, unsigned long val)
 452 {
 453         br->multicast_last_member_count = val;
 454         return 0;
 455 }
 456
 457 static ssize_t multicast_last_member_count_store(struct device *d,
 458                                                  struct device_attribute *attr,
 459                                                  const char *buf, size_t len)
 460 {
 461         return store_bridge_parm(d, buf, len, set_last_member_count);
 462 }
 463 static DEVICE_ATTR_RW(multicast_last_member_count);
 464
 465 static ssize_t multicast_startup_query_count_show(
 466         struct device *d, struct device_attribute *attr, char *buf)
 467 {
 468         struct net_bridge *br = to_bridge(d);
 469         return sprintf(buf, "%u\n", br->multicast_startup_query_count);
 470 }
 471
 472 static int set_startup_query_count(struct net_bridge *br, unsigned long val)
 473 {
 474         br->multicast_startup_query_count = val;
 475         return 0;
 476 }
 477
 478 static ssize_t multicast_startup_query_count_store(
 479         struct device *d, struct device_attribute *attr, const char *buf,
 480         size_t len)
 481 {
 482         return store_bridge_parm(d, buf, len, set_startup_query_count);
 483 }
 484 static DEVICE_ATTR_RW(multicast_startup_query_count);
 485
 486 static ssize_t multicast_last_member_interval_show(
 487         struct device *d, struct device_attribute *attr, char *buf)
 488 {
 489         struct net_bridge *br = to_bridge(d);
 490         return sprintf(buf, "%lu\n",
 491                        jiffies_to_clock_t(br->multicast_last_member_interval));
 492 }
 493
 494 static int set_last_member_interval(struct net_bridge *br, unsigned long val)
 495 {
 496         br->multicast_last_member_interval = clock_t_to_jiffies(val);
 497         return 0;
 498 }
 499
 500 static ssize_t multicast_last_member_interval_store(
 501         struct device *d, struct device_attribute *attr, const char *buf,
 502         size_t len)
 503 {
 504         return store_bridge_parm(d, buf, len, set_last_member_interval);
 505 }
 506 static DEVICE_ATTR_RW(multicast_last_member_interval);
 507
 508 static ssize_t multicast_membership_interval_show(
 509         struct device *d, struct device_attribute *attr, char *buf)
 510 {
 511         struct net_bridge *br = to_bridge(d);
 512         return sprintf(buf, "%lu\n",
 513                        jiffies_to_clock_t(br->multicast_membership_interval));
 514 }
 515
 516 static int set_membership_interval(struct net_bridge *br, unsigned long val)
 517 {
 518         br->multicast_membership_interval = clock_t_to_jiffies(val);
 519         return 0;
 520 }
 521
 522 static ssize_t multicast_membership_interval_store(
 523         struct device *d, struct device_attribute *attr, const char *buf,
 524         size_t len)
 525 {
 526         return store_bridge_parm(d, buf, len, set_membership_interval);
 527 }
 528 static DEVICE_ATTR_RW(multicast_membership_interval);
 529
 530 static ssize_t multicast_querier_interval_show(struct device *d,
 531                                                struct device_attribute *attr,
 532                                                char *buf)
 533 {
 534         struct net_bridge *br = to_bridge(d);
 535         return sprintf(buf, "%lu\n",
 536                        jiffies_to_clock_t(br->multicast_querier_interval));
 537 }
 538
 539 static int set_querier_interval(struct net_bridge *br, unsigned long val)
 540 {
 541         br->multicast_querier_interval = clock_t_to_jiffies(val);
 542         return 0;
 543 }
 544
 545 static ssize_t multicast_querier_interval_store(struct device *d,
 546                                                 struct device_attribute *attr,
 547                                                 const char *buf, size_t len)
 548 {
 549         return store_bridge_parm(d, buf, len, set_querier_interval);
 550 }
 551 static DEVICE_ATTR_RW(multicast_querier_interval);
 552
 553 static ssize_t multicast_query_interval_show(struct device *d,
 554                                              struct device_attribute *attr,
 555                                              char *buf)
 556 {
 557         struct net_bridge *br = to_bridge(d);
 558         return sprintf(buf, "%lu\n",
 559                        jiffies_to_clock_t(br->multicast_query_interval));
 560 }
 561
 562 static int set_query_interval(struct net_bridge *br, unsigned long val)
 563 {
 564         br->multicast_query_interval = clock_t_to_jiffies(val);
 565         return 0;
 566 }
 567
 568 static ssize_t multicast_query_interval_store(struct device *d,
 569                                               struct device_attribute *attr,
 570                                               const char *buf, size_t len)
 571 {
 572         return store_bridge_parm(d, buf, len, set_query_interval);
 573 }
 574 static DEVICE_ATTR_RW(multicast_query_interval);
 575
 576 static ssize_t multicast_query_response_interval_show(
 577         struct device *d, struct device_attribute *attr, char *buf)
 578 {
 579         struct net_bridge *br = to_bridge(d);
 580         return sprintf(
 581                 buf, "%lu\n",
 582                 jiffies_to_clock_t(br->multicast_query_response_interval));
 583 }
 584
 585 static int set_query_response_interval(struct net_bridge *br, unsigned long val)
 586 {
 587         br->multicast_query_response_interval = clock_t_to_jiffies(val);
 588         return 0;
 589 }
 590
 591 static ssize_t multicast_query_response_interval_store(
 592         struct device *d, struct device_attribute *attr, const char *buf,
 593         size_t len)
 594 {
 595         return store_bridge_parm(d, buf, len, set_query_response_interval);
 596 }
 597 static DEVICE_ATTR_RW(multicast_query_response_interval);
 598
 599 static ssize_t multicast_startup_query_interval_show(
 600         struct device *d, struct device_attribute *attr, char *buf)
 601 {
 602         struct net_bridge *br = to_bridge(d);
 603         return sprintf(
 604                 buf, "%lu\n",
 605                 jiffies_to_clock_t(br->multicast_startup_query_interval));
 606 }
 607
 608 static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
 609 {
 610         br->multicast_startup_query_interval = clock_t_to_jiffies(val);
 611         return 0;
 612 }
 613
 614 static ssize_t multicast_startup_query_interval_store(
 615         struct device *d, struct device_attribute *attr, const char *buf,
 616         size_t len)
 617 {
 618         return store_bridge_parm(d, buf, len, set_startup_query_interval);
 619 }
 620 static DEVICE_ATTR_RW(multicast_startup_query_interval);
 621 #endif
 622 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 623 static ssize_t nf_call_iptables_show(
 624         struct device *d, struct device_attribute *attr, char *buf)
 625 {
 626         struct net_bridge *br = to_bridge(d);
 627         return sprintf(buf, "%u\n", br->nf_call_iptables);
 628 }
 629
 630 static int set_nf_call_iptables(struct net_bridge *br, unsigned long val)
 631 {
 632         br->nf_call_iptables = val ? true : false;
 633         return 0;
 634 }
 635
 636 static ssize_t nf_call_iptables_store(
 637         struct device *d, struct device_attribute *attr, const char *buf,
 638         size_t len)
 639 {
 640         return store_bridge_parm(d, buf, len, set_nf_call_iptables);
 641 }
 642 static DEVICE_ATTR_RW(nf_call_iptables);
 643
 644 static ssize_t nf_call_ip6tables_show(
 645         struct device *d, struct device_attribute *attr, char *buf)
 646 {
 647         struct net_bridge *br = to_bridge(d);
 648         return sprintf(buf, "%u\n", br->nf_call_ip6tables);
 649 }
 650
 651 static int set_nf_call_ip6tables(struct net_bridge *br, unsigned long val)
 652 {
 653         br->nf_call_ip6tables = val ? true : false;
 654         return 0;
 655 }
 656
 657 static ssize_t nf_call_ip6tables_store(
 658         struct device *d, struct device_attribute *attr, const char *buf,
 659         size_t len)
 660 {
 661         return store_bridge_parm(d, buf, len, set_nf_call_ip6tables);
 662 }
 663 static DEVICE_ATTR_RW(nf_call_ip6tables);
 664
 665 static ssize_t nf_call_arptables_show(
 666         struct device *d, struct device_attribute *attr, char *buf)
 667 {
 668         struct net_bridge *br = to_bridge(d);
 669         return sprintf(buf, "%u\n", br->nf_call_arptables);
 670 }
 671
 672 static int set_nf_call_arptables(struct net_bridge *br, unsigned long val)
 673 {
 674         br->nf_call_arptables = val ? true : false;
 675         return 0;
 676 }
 677
 678 static ssize_t nf_call_arptables_store(
 679         struct device *d, struct device_attribute *attr, const char *buf,
 680         size_t len)
 681 {
 682         return store_bridge_parm(d, buf, len, set_nf_call_arptables);
 683 }
 684 static DEVICE_ATTR_RW(nf_call_arptables);
 685 #endif
 686 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 687 static ssize_t vlan_filtering_show(struct device *d,
 688                                    struct device_attribute *attr,
 689                                    char *buf)
 690 {
 691         struct net_bridge *br = to_bridge(d);
 692         return sprintf(buf, "%d\n", br->vlan_enabled);
 693 }
 694
 695 static ssize_t vlan_filtering_store(struct device *d,
 696                                     struct device_attribute *attr,
 697                                     const char *buf, size_t len)
 698 {
 699         return store_bridge_parm(d, buf, len, br_vlan_filter_toggle);
 700 }
 701 static DEVICE_ATTR_RW(vlan_filtering);
 702
 703 static ssize_t vlan_protocol_show(struct device *d,
 704                                   struct device_attribute *attr,
 705                                   char *buf)
 706 {
 707         struct net_bridge *br = to_bridge(d);
 708         return sprintf(buf, "%#06x\n", ntohs(br->vlan_proto));
 709 }
 710
 711 static ssize_t vlan_protocol_store(struct device *d,
 712                                    struct device_attribute *attr,
 713                                    const char *buf, size_t len)
 714 {
 715         return store_bridge_parm(d, buf, len, br_vlan_set_proto);
 716 }
 717 static DEVICE_ATTR_RW(vlan_protocol);
 718
 719 static ssize_t default_pvid_show(struct device *d,
 720                                  struct device_attribute *attr,
 721                                  char *buf)
 722 {
 723         struct net_bridge *br = to_bridge(d);
 724         return sprintf(buf, "%d\n", br->default_pvid);
 725 }
 726
 727 static ssize_t default_pvid_store(struct device *d,
 728                                   struct device_attribute *attr,
 729                                   const char *buf, size_t len)
 730 {
 731         return store_bridge_parm(d, buf, len, br_vlan_set_default_pvid);
 732 }
 733 static DEVICE_ATTR_RW(default_pvid);
 734
 735 static ssize_t vlan_stats_enabled_show(struct device *d,
 736                                        struct device_attribute *attr,
 737                                        char *buf)
 738 {
 739         struct net_bridge *br = to_bridge(d);
 740         return sprintf(buf, "%u\n", br->vlan_stats_enabled);
 741 }
 742
 743 static ssize_t vlan_stats_enabled_store(struct device *d,
 744                                         struct device_attribute *attr,
 745                                         const char *buf, size_t len)
 746 {
 747         return store_bridge_parm(d, buf, len, br_vlan_set_stats);
 748 }
 749 static DEVICE_ATTR_RW(vlan_stats_enabled);
 750 #endif
 751
 752 static struct attribute *bridge_attrs[] = {
 753         &dev_attr_forward_delay.attr,
 754         &dev_attr_hello_time.attr,
 755         &dev_attr_max_age.attr,
 756         &dev_attr_ageing_time.attr,
 757         &dev_attr_stp_state.attr,
 758         &dev_attr_group_fwd_mask.attr,
 759         &dev_attr_priority.attr,
 760         &dev_attr_bridge_id.attr,
 761         &dev_attr_root_id.attr,
 762         &dev_attr_root_path_cost.attr,
 763         &dev_attr_root_port.attr,
 764         &dev_attr_topology_change.attr,
 765         &dev_attr_topology_change_detected.attr,
 766         &dev_attr_hello_timer.attr,
 767         &dev_attr_tcn_timer.attr,
 768         &dev_attr_topology_change_timer.attr,
 769         &dev_attr_gc_timer.attr,
 770         &dev_attr_group_addr.attr,
 771         &dev_attr_flush.attr,
 772 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 773         &dev_attr_multicast_router.attr,
 774         &dev_attr_multicast_snooping.attr,
 775         &dev_attr_multicast_querier.attr,
 776         &dev_attr_multicast_query_use_ifaddr.attr,
 777         &dev_attr_hash_elasticity.attr,
 778         &dev_attr_hash_max.attr,
 779         &dev_attr_multicast_last_member_count.attr,
 780         &dev_attr_multicast_startup_query_count.attr,
 781         &dev_attr_multicast_last_member_interval.attr,
 782         &dev_attr_multicast_membership_interval.attr,
 783         &dev_attr_multicast_querier_interval.attr,
 784         &dev_attr_multicast_query_interval.attr,
 785         &dev_attr_multicast_query_response_interval.attr,
 786         &dev_attr_multicast_startup_query_interval.attr,
 787 #endif
 788 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 789         &dev_attr_nf_call_iptables.attr,
 790         &dev_attr_nf_call_ip6tables.attr,
 791         &dev_attr_nf_call_arptables.attr,
 792 #endif
 793 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 794         &dev_attr_vlan_filtering.attr,
 795         &dev_attr_vlan_protocol.attr,
 796         &dev_attr_default_pvid.attr,
 797         &dev_attr_vlan_stats_enabled.attr,
 798 #endif
 799         NULL
 800 };
 801
 802 static struct attribute_group bridge_group = {
 803         .name = SYSFS_BRIDGE_ATTR,
 804         .attrs = bridge_attrs,
 805 };
 806
 807 /*
 808  * Export the forwarding information table as a binary file
 809  * The records are struct __fdb_entry.
 810  *
 811  * Returns the number of bytes read.
 812  */
 813 static ssize_t brforward_read(struct file *filp, struct kobject *kobj,
 814                               struct bin_attribute *bin_attr,
 815                               char *buf, loff_t off, size_t count)
 816 {
 817         struct device *dev = kobj_to_dev(kobj);
 818         struct net_bridge *br = to_bridge(dev);
 819         int n;
 820
 821         /* must read whole records */
 822         if (off % sizeof(struct __fdb_entry) != 0)
 823                 return -EINVAL;
 824
 825         n =  br_fdb_fillbuf(br, buf,
 826                             count / sizeof(struct __fdb_entry),
 827                             off / sizeof(struct __fdb_entry));
 828
 829         if (n > 0)
 830                 n *= sizeof(struct __fdb_entry);
 831
 832         return n;
 833 }
 834
 835 static struct bin_attribute bridge_forward = {
 836         .attr = { .name = SYSFS_BRIDGE_FDB,
 837                   .mode = S_IRUGO, },
 838         .read = brforward_read,
 839 };
 840
 841 /*
 842  * Add entries in sysfs onto the existing network class device
 843  * for the bridge.
 844  *   Adds a attribute group "bridge" containing tuning parameters.
 845  *   Binary attribute containing the forward table
 846  *   Sub directory to hold links to interfaces.
 847  *
 848  * Note: the ifobj exists only to be a subdirectory
 849  *   to hold links.  The ifobj exists in same data structure
 850  *   as it's parent the bridge so reference counting works.
 851  */
 852 int br_sysfs_addbr(struct net_device *dev)
 853 {
 854         struct kobject *brobj = &dev->dev.kobj;
 855         struct net_bridge *br = netdev_priv(dev);
 856         int err;
 857
 858         err = sysfs_create_group(brobj, &bridge_group);
 859         if (err) {
 860                 pr_info("%s: can't create group %s/%s\n",
 861                         __func__, dev->name, bridge_group.name);
 862                 goto out1;
 863         }
 864
 865         err = sysfs_create_bin_file(brobj, &bridge_forward);
 866         if (err) {
 867                 pr_info("%s: can't create attribute file %s/%s\n",
 868                         __func__, dev->name, bridge_forward.attr.name);
 869                 goto out2;
 870         }
 871
 872         br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
 873         if (!br->ifobj) {
 874                 pr_info("%s: can't add kobject (directory) %s/%s\n",
 875                         __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
 876                 goto out3;
 877         }
 878         return 0;
 879  out3:
 880         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
 881  out2:
 882         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
 883  out1:
 884         return err;
 885
 886 }
 887
 888 void br_sysfs_delbr(struct net_device *dev)
 889 {
 890         struct kobject *kobj = &dev->dev.kobj;
 891         struct net_bridge *br = netdev_priv(dev);
 892
 893         kobject_put(br->ifobj);
 894         sysfs_remove_bin_file(kobj, &bridge_forward);
 895         sysfs_remove_group(kobj, &bridge_group);
 896 }