1 /* 2 * Sysfs attributes of bridge ports 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/if_bridge.h> 18 #include <linux/rtnetlink.h> 19 #include <linux/spinlock.h> 20 #include <linux/times.h> 21 22 #include "br_private.h" 23 24 #define to_dev(obj) container_of(obj, struct device, kobj) 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 (!capable(CAP_NET_ADMIN)) 40 return -EPERM; 41 42 val = simple_strtoul(buf, &endp, 0); 43 if (endp == buf) 44 return -EINVAL; 45 46 spin_lock_bh(&br->lock); 47 err = (*set)(br, val); 48 spin_unlock_bh(&br->lock); 49 return err ? err : len; 50 } 51 52 53 static ssize_t show_forward_delay(struct device *d, 54 struct device_attribute *attr, char *buf) 55 { 56 struct net_bridge *br = to_bridge(d); 57 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay)); 58 } 59 60 static int set_forward_delay(struct net_bridge *br, unsigned long val) 61 { 62 unsigned long delay = clock_t_to_jiffies(val); 63 br->forward_delay = delay; 64 if (br_is_root_bridge(br)) 65 br->bridge_forward_delay = delay; 66 return 0; 67 } 68 69 static ssize_t store_forward_delay(struct device *d, 70 struct device_attribute *attr, 71 const char *buf, size_t len) 72 { 73 return store_bridge_parm(d, buf, len, set_forward_delay); 74 } 75 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR, 76 show_forward_delay, store_forward_delay); 77 78 static ssize_t show_hello_time(struct device *d, struct device_attribute *attr, 79 char *buf) 80 { 81 return sprintf(buf, "%lu\n", 82 jiffies_to_clock_t(to_bridge(d)->hello_time)); 83 } 84 85 static int set_hello_time(struct net_bridge *br, unsigned long val) 86 { 87 unsigned long t = clock_t_to_jiffies(val); 88 89 if (t < HZ) 90 return -EINVAL; 91 92 br->hello_time = t; 93 if (br_is_root_bridge(br)) 94 br->bridge_hello_time = t; 95 return 0; 96 } 97 98 static ssize_t store_hello_time(struct device *d, 99 struct device_attribute *attr, const char *buf, 100 size_t len) 101 { 102 return store_bridge_parm(d, buf, len, set_hello_time); 103 } 104 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time, 105 store_hello_time); 106 107 static ssize_t show_max_age(struct device *d, struct device_attribute *attr, 108 char *buf) 109 { 110 return sprintf(buf, "%lu\n", 111 jiffies_to_clock_t(to_bridge(d)->max_age)); 112 } 113 114 static int set_max_age(struct net_bridge *br, unsigned long val) 115 { 116 unsigned long t = clock_t_to_jiffies(val); 117 br->max_age = t; 118 if (br_is_root_bridge(br)) 119 br->bridge_max_age = t; 120 return 0; 121 } 122 123 static ssize_t store_max_age(struct device *d, struct device_attribute *attr, 124 const char *buf, size_t len) 125 { 126 return store_bridge_parm(d, buf, len, set_max_age); 127 } 128 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age); 129 130 static ssize_t show_ageing_time(struct device *d, 131 struct device_attribute *attr, char *buf) 132 { 133 struct net_bridge *br = to_bridge(d); 134 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time)); 135 } 136 137 static int set_ageing_time(struct net_bridge *br, unsigned long val) 138 { 139 br->ageing_time = clock_t_to_jiffies(val); 140 return 0; 141 } 142 143 static ssize_t store_ageing_time(struct device *d, 144 struct device_attribute *attr, 145 const char *buf, size_t len) 146 { 147 return store_bridge_parm(d, buf, len, set_ageing_time); 148 } 149 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time, 150 store_ageing_time); 151 152 static ssize_t show_stp_state(struct device *d, 153 struct device_attribute *attr, char *buf) 154 { 155 struct net_bridge *br = to_bridge(d); 156 return sprintf(buf, "%d\n", br->stp_enabled); 157 } 158 159 160 static ssize_t store_stp_state(struct device *d, 161 struct device_attribute *attr, const char *buf, 162 size_t len) 163 { 164 struct net_bridge *br = to_bridge(d); 165 char *endp; 166 unsigned long val; 167 168 if (!capable(CAP_NET_ADMIN)) 169 return -EPERM; 170 171 val = simple_strtoul(buf, &endp, 0); 172 if (endp == buf) 173 return -EINVAL; 174 175 if (!rtnl_trylock()) 176 return restart_syscall(); 177 br_stp_set_enabled(br, val); 178 rtnl_unlock(); 179 180 return len; 181 } 182 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state, 183 store_stp_state); 184 185 static ssize_t show_priority(struct device *d, struct device_attribute *attr, 186 char *buf) 187 { 188 struct net_bridge *br = to_bridge(d); 189 return sprintf(buf, "%d\n", 190 (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]); 191 } 192 193 static int set_priority(struct net_bridge *br, unsigned long val) 194 { 195 br_stp_set_bridge_priority(br, (u16) val); 196 return 0; 197 } 198 199 static ssize_t store_priority(struct device *d, struct device_attribute *attr, 200 const char *buf, size_t len) 201 { 202 return store_bridge_parm(d, buf, len, set_priority); 203 } 204 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority); 205 206 static ssize_t show_root_id(struct device *d, struct device_attribute *attr, 207 char *buf) 208 { 209 return br_show_bridge_id(buf, &to_bridge(d)->designated_root); 210 } 211 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL); 212 213 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr, 214 char *buf) 215 { 216 return br_show_bridge_id(buf, &to_bridge(d)->bridge_id); 217 } 218 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL); 219 220 static ssize_t show_root_port(struct device *d, struct device_attribute *attr, 221 char *buf) 222 { 223 return sprintf(buf, "%d\n", to_bridge(d)->root_port); 224 } 225 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL); 226 227 static ssize_t show_root_path_cost(struct device *d, 228 struct device_attribute *attr, char *buf) 229 { 230 return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost); 231 } 232 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL); 233 234 static ssize_t show_topology_change(struct device *d, 235 struct device_attribute *attr, char *buf) 236 { 237 return sprintf(buf, "%d\n", to_bridge(d)->topology_change); 238 } 239 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL); 240 241 static ssize_t show_topology_change_detected(struct device *d, 242 struct device_attribute *attr, 243 char *buf) 244 { 245 struct net_bridge *br = to_bridge(d); 246 return sprintf(buf, "%d\n", br->topology_change_detected); 247 } 248 static DEVICE_ATTR(topology_change_detected, S_IRUGO, 249 show_topology_change_detected, NULL); 250 251 static ssize_t show_hello_timer(struct device *d, 252 struct device_attribute *attr, char *buf) 253 { 254 struct net_bridge *br = to_bridge(d); 255 return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer)); 256 } 257 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL); 258 259 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr, 260 char *buf) 261 { 262 struct net_bridge *br = to_bridge(d); 263 return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer)); 264 } 265 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL); 266 267 static ssize_t show_topology_change_timer(struct device *d, 268 struct device_attribute *attr, 269 char *buf) 270 { 271 struct net_bridge *br = to_bridge(d); 272 return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer)); 273 } 274 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, 275 NULL); 276 277 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr, 278 char *buf) 279 { 280 struct net_bridge *br = to_bridge(d); 281 return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer)); 282 } 283 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL); 284 285 static ssize_t show_group_addr(struct device *d, 286 struct device_attribute *attr, char *buf) 287 { 288 struct net_bridge *br = to_bridge(d); 289 return sprintf(buf, "%x:%x:%x:%x:%x:%x\n", 290 br->group_addr[0], br->group_addr[1], 291 br->group_addr[2], br->group_addr[3], 292 br->group_addr[4], br->group_addr[5]); 293 } 294 295 static ssize_t store_group_addr(struct device *d, 296 struct device_attribute *attr, 297 const char *buf, size_t len) 298 { 299 struct net_bridge *br = to_bridge(d); 300 unsigned new_addr[6]; 301 int i; 302 303 if (!capable(CAP_NET_ADMIN)) 304 return -EPERM; 305 306 if (sscanf(buf, "%x:%x:%x:%x:%x:%x", 307 &new_addr[0], &new_addr[1], &new_addr[2], 308 &new_addr[3], &new_addr[4], &new_addr[5]) != 6) 309 return -EINVAL; 310 311 /* Must be 01:80:c2:00:00:0X */ 312 for (i = 0; i < 5; i++) 313 if (new_addr[i] != br_group_address[i]) 314 return -EINVAL; 315 316 if (new_addr[5] & ~0xf) 317 return -EINVAL; 318 319 if (new_addr[5] == 1 || /* 802.3x Pause address */ 320 new_addr[5] == 2 || /* 802.3ad Slow protocols */ 321 new_addr[5] == 3) /* 802.1X PAE address */ 322 return -EINVAL; 323 324 spin_lock_bh(&br->lock); 325 for (i = 0; i < 6; i++) 326 br->group_addr[i] = new_addr[i]; 327 spin_unlock_bh(&br->lock); 328 return len; 329 } 330 331 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR, 332 show_group_addr, store_group_addr); 333 334 static ssize_t store_flush(struct device *d, 335 struct device_attribute *attr, 336 const char *buf, size_t len) 337 { 338 struct net_bridge *br = to_bridge(d); 339 340 if (!capable(CAP_NET_ADMIN)) 341 return -EPERM; 342 343 br_fdb_flush(br); 344 return len; 345 } 346 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush); 347 348 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 349 static ssize_t show_multicast_router(struct device *d, 350 struct device_attribute *attr, char *buf) 351 { 352 struct net_bridge *br = to_bridge(d); 353 return sprintf(buf, "%d\n", br->multicast_router); 354 } 355 356 static ssize_t store_multicast_router(struct device *d, 357 struct device_attribute *attr, 358 const char *buf, size_t len) 359 { 360 return store_bridge_parm(d, buf, len, br_multicast_set_router); 361 } 362 static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, 363 store_multicast_router); 364 365 static ssize_t show_multicast_snooping(struct device *d, 366 struct device_attribute *attr, 367 char *buf) 368 { 369 struct net_bridge *br = to_bridge(d); 370 return sprintf(buf, "%d\n", !br->multicast_disabled); 371 } 372 373 static ssize_t store_multicast_snooping(struct device *d, 374 struct device_attribute *attr, 375 const char *buf, size_t len) 376 { 377 return store_bridge_parm(d, buf, len, br_multicast_toggle); 378 } 379 static DEVICE_ATTR(multicast_snooping, S_IRUGO | S_IWUSR, 380 show_multicast_snooping, store_multicast_snooping); 381 382 static ssize_t show_hash_elasticity(struct device *d, 383 struct device_attribute *attr, char *buf) 384 { 385 struct net_bridge *br = to_bridge(d); 386 return sprintf(buf, "%u\n", br->hash_elasticity); 387 } 388 389 static int set_elasticity(struct net_bridge *br, unsigned long val) 390 { 391 br->hash_elasticity = val; 392 return 0; 393 } 394 395 static ssize_t store_hash_elasticity(struct device *d, 396 struct device_attribute *attr, 397 const char *buf, size_t len) 398 { 399 return store_bridge_parm(d, buf, len, set_elasticity); 400 } 401 static DEVICE_ATTR(hash_elasticity, S_IRUGO | S_IWUSR, show_hash_elasticity, 402 store_hash_elasticity); 403 404 static ssize_t show_hash_max(struct device *d, struct device_attribute *attr, 405 char *buf) 406 { 407 struct net_bridge *br = to_bridge(d); 408 return sprintf(buf, "%u\n", br->hash_max); 409 } 410 411 static ssize_t store_hash_max(struct device *d, struct device_attribute *attr, 412 const char *buf, size_t len) 413 { 414 return store_bridge_parm(d, buf, len, br_multicast_set_hash_max); 415 } 416 static DEVICE_ATTR(hash_max, S_IRUGO | S_IWUSR, show_hash_max, 417 store_hash_max); 418 419 static ssize_t show_multicast_last_member_count(struct device *d, 420 struct device_attribute *attr, 421 char *buf) 422 { 423 struct net_bridge *br = to_bridge(d); 424 return sprintf(buf, "%u\n", br->multicast_last_member_count); 425 } 426 427 static int set_last_member_count(struct net_bridge *br, unsigned long val) 428 { 429 br->multicast_last_member_count = val; 430 return 0; 431 } 432 433 static ssize_t store_multicast_last_member_count(struct device *d, 434 struct device_attribute *attr, 435 const char *buf, size_t len) 436 { 437 return store_bridge_parm(d, buf, len, set_last_member_count); 438 } 439 static DEVICE_ATTR(multicast_last_member_count, S_IRUGO | S_IWUSR, 440 show_multicast_last_member_count, 441 store_multicast_last_member_count); 442 443 static ssize_t show_multicast_startup_query_count( 444 struct device *d, struct device_attribute *attr, char *buf) 445 { 446 struct net_bridge *br = to_bridge(d); 447 return sprintf(buf, "%u\n", br->multicast_startup_query_count); 448 } 449 450 static int set_startup_query_count(struct net_bridge *br, unsigned long val) 451 { 452 br->multicast_startup_query_count = val; 453 return 0; 454 } 455 456 static ssize_t store_multicast_startup_query_count( 457 struct device *d, struct device_attribute *attr, const char *buf, 458 size_t len) 459 { 460 return store_bridge_parm(d, buf, len, set_startup_query_count); 461 } 462 static DEVICE_ATTR(multicast_startup_query_count, S_IRUGO | S_IWUSR, 463 show_multicast_startup_query_count, 464 store_multicast_startup_query_count); 465 466 static ssize_t show_multicast_last_member_interval( 467 struct device *d, struct device_attribute *attr, char *buf) 468 { 469 struct net_bridge *br = to_bridge(d); 470 return sprintf(buf, "%lu\n", 471 jiffies_to_clock_t(br->multicast_last_member_interval)); 472 } 473 474 static int set_last_member_interval(struct net_bridge *br, unsigned long val) 475 { 476 br->multicast_last_member_interval = clock_t_to_jiffies(val); 477 return 0; 478 } 479 480 static ssize_t store_multicast_last_member_interval( 481 struct device *d, struct device_attribute *attr, const char *buf, 482 size_t len) 483 { 484 return store_bridge_parm(d, buf, len, set_last_member_interval); 485 } 486 static DEVICE_ATTR(multicast_last_member_interval, S_IRUGO | S_IWUSR, 487 show_multicast_last_member_interval, 488 store_multicast_last_member_interval); 489 490 static ssize_t show_multicast_membership_interval( 491 struct device *d, struct device_attribute *attr, char *buf) 492 { 493 struct net_bridge *br = to_bridge(d); 494 return sprintf(buf, "%lu\n", 495 jiffies_to_clock_t(br->multicast_membership_interval)); 496 } 497 498 static int set_membership_interval(struct net_bridge *br, unsigned long val) 499 { 500 br->multicast_membership_interval = clock_t_to_jiffies(val); 501 return 0; 502 } 503 504 static ssize_t store_multicast_membership_interval( 505 struct device *d, struct device_attribute *attr, const char *buf, 506 size_t len) 507 { 508 return store_bridge_parm(d, buf, len, set_membership_interval); 509 } 510 static DEVICE_ATTR(multicast_membership_interval, S_IRUGO | S_IWUSR, 511 show_multicast_membership_interval, 512 store_multicast_membership_interval); 513 514 static ssize_t show_multicast_querier_interval(struct device *d, 515 struct device_attribute *attr, 516 char *buf) 517 { 518 struct net_bridge *br = to_bridge(d); 519 return sprintf(buf, "%lu\n", 520 jiffies_to_clock_t(br->multicast_querier_interval)); 521 } 522 523 static int set_querier_interval(struct net_bridge *br, unsigned long val) 524 { 525 br->multicast_querier_interval = clock_t_to_jiffies(val); 526 return 0; 527 } 528 529 static ssize_t store_multicast_querier_interval(struct device *d, 530 struct device_attribute *attr, 531 const char *buf, size_t len) 532 { 533 return store_bridge_parm(d, buf, len, set_querier_interval); 534 } 535 static DEVICE_ATTR(multicast_querier_interval, S_IRUGO | S_IWUSR, 536 show_multicast_querier_interval, 537 store_multicast_querier_interval); 538 539 static ssize_t show_multicast_query_interval(struct device *d, 540 struct device_attribute *attr, 541 char *buf) 542 { 543 struct net_bridge *br = to_bridge(d); 544 return sprintf(buf, "%lu\n", 545 jiffies_to_clock_t(br->multicast_query_interval)); 546 } 547 548 static int set_query_interval(struct net_bridge *br, unsigned long val) 549 { 550 br->multicast_query_interval = clock_t_to_jiffies(val); 551 return 0; 552 } 553 554 static ssize_t store_multicast_query_interval(struct device *d, 555 struct device_attribute *attr, 556 const char *buf, size_t len) 557 { 558 return store_bridge_parm(d, buf, len, set_query_interval); 559 } 560 static DEVICE_ATTR(multicast_query_interval, S_IRUGO | S_IWUSR, 561 show_multicast_query_interval, 562 store_multicast_query_interval); 563 564 static ssize_t show_multicast_query_response_interval( 565 struct device *d, struct device_attribute *attr, char *buf) 566 { 567 struct net_bridge *br = to_bridge(d); 568 return sprintf( 569 buf, "%lu\n", 570 jiffies_to_clock_t(br->multicast_query_response_interval)); 571 } 572 573 static int set_query_response_interval(struct net_bridge *br, unsigned long val) 574 { 575 br->multicast_query_response_interval = clock_t_to_jiffies(val); 576 return 0; 577 } 578 579 static ssize_t store_multicast_query_response_interval( 580 struct device *d, struct device_attribute *attr, const char *buf, 581 size_t len) 582 { 583 return store_bridge_parm(d, buf, len, set_query_response_interval); 584 } 585 static DEVICE_ATTR(multicast_query_response_interval, S_IRUGO | S_IWUSR, 586 show_multicast_query_response_interval, 587 store_multicast_query_response_interval); 588 589 static ssize_t show_multicast_startup_query_interval( 590 struct device *d, struct device_attribute *attr, char *buf) 591 { 592 struct net_bridge *br = to_bridge(d); 593 return sprintf( 594 buf, "%lu\n", 595 jiffies_to_clock_t(br->multicast_startup_query_interval)); 596 } 597 598 static int set_startup_query_interval(struct net_bridge *br, unsigned long val) 599 { 600 br->multicast_startup_query_interval = clock_t_to_jiffies(val); 601 return 0; 602 } 603 604 static ssize_t store_multicast_startup_query_interval( 605 struct device *d, struct device_attribute *attr, const char *buf, 606 size_t len) 607 { 608 return store_bridge_parm(d, buf, len, set_startup_query_interval); 609 } 610 static DEVICE_ATTR(multicast_startup_query_interval, S_IRUGO | S_IWUSR, 611 show_multicast_startup_query_interval, 612 store_multicast_startup_query_interval); 613 #endif 614 615 static struct attribute *bridge_attrs[] = { 616 &dev_attr_forward_delay.attr, 617 &dev_attr_hello_time.attr, 618 &dev_attr_max_age.attr, 619 &dev_attr_ageing_time.attr, 620 &dev_attr_stp_state.attr, 621 &dev_attr_priority.attr, 622 &dev_attr_bridge_id.attr, 623 &dev_attr_root_id.attr, 624 &dev_attr_root_path_cost.attr, 625 &dev_attr_root_port.attr, 626 &dev_attr_topology_change.attr, 627 &dev_attr_topology_change_detected.attr, 628 &dev_attr_hello_timer.attr, 629 &dev_attr_tcn_timer.attr, 630 &dev_attr_topology_change_timer.attr, 631 &dev_attr_gc_timer.attr, 632 &dev_attr_group_addr.attr, 633 &dev_attr_flush.attr, 634 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 635 &dev_attr_multicast_router.attr, 636 &dev_attr_multicast_snooping.attr, 637 &dev_attr_hash_elasticity.attr, 638 &dev_attr_hash_max.attr, 639 &dev_attr_multicast_last_member_count.attr, 640 &dev_attr_multicast_startup_query_count.attr, 641 &dev_attr_multicast_last_member_interval.attr, 642 &dev_attr_multicast_membership_interval.attr, 643 &dev_attr_multicast_querier_interval.attr, 644 &dev_attr_multicast_query_interval.attr, 645 &dev_attr_multicast_query_response_interval.attr, 646 &dev_attr_multicast_startup_query_interval.attr, 647 #endif 648 NULL 649 }; 650 651 static struct attribute_group bridge_group = { 652 .name = SYSFS_BRIDGE_ATTR, 653 .attrs = bridge_attrs, 654 }; 655 656 /* 657 * Export the forwarding information table as a binary file 658 * The records are struct __fdb_entry. 659 * 660 * Returns the number of bytes read. 661 */ 662 static ssize_t brforward_read(struct kobject *kobj, 663 struct bin_attribute *bin_attr, 664 char *buf, loff_t off, size_t count) 665 { 666 struct device *dev = to_dev(kobj); 667 struct net_bridge *br = to_bridge(dev); 668 int n; 669 670 /* must read whole records */ 671 if (off % sizeof(struct __fdb_entry) != 0) 672 return -EINVAL; 673 674 n = br_fdb_fillbuf(br, buf, 675 count / sizeof(struct __fdb_entry), 676 off / sizeof(struct __fdb_entry)); 677 678 if (n > 0) 679 n *= sizeof(struct __fdb_entry); 680 681 return n; 682 } 683 684 static struct bin_attribute bridge_forward = { 685 .attr = { .name = SYSFS_BRIDGE_FDB, 686 .mode = S_IRUGO, }, 687 .read = brforward_read, 688 }; 689 690 /* 691 * Add entries in sysfs onto the existing network class device 692 * for the bridge. 693 * Adds a attribute group "bridge" containing tuning parameters. 694 * Binary attribute containing the forward table 695 * Sub directory to hold links to interfaces. 696 * 697 * Note: the ifobj exists only to be a subdirectory 698 * to hold links. The ifobj exists in same data structure 699 * as it's parent the bridge so reference counting works. 700 */ 701 int br_sysfs_addbr(struct net_device *dev) 702 { 703 struct kobject *brobj = &dev->dev.kobj; 704 struct net_bridge *br = netdev_priv(dev); 705 int err; 706 707 err = sysfs_create_group(brobj, &bridge_group); 708 if (err) { 709 pr_info("%s: can't create group %s/%s\n", 710 __func__, dev->name, bridge_group.name); 711 goto out1; 712 } 713 714 err = sysfs_create_bin_file(brobj, &bridge_forward); 715 if (err) { 716 pr_info("%s: can't create attribute file %s/%s\n", 717 __func__, dev->name, bridge_forward.attr.name); 718 goto out2; 719 } 720 721 br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj); 722 if (!br->ifobj) { 723 pr_info("%s: can't add kobject (directory) %s/%s\n", 724 __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR); 725 goto out3; 726 } 727 return 0; 728 out3: 729 sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward); 730 out2: 731 sysfs_remove_group(&dev->dev.kobj, &bridge_group); 732 out1: 733 return err; 734 735 } 736 737 void br_sysfs_delbr(struct net_device *dev) 738 { 739 struct kobject *kobj = &dev->dev.kobj; 740 struct net_bridge *br = netdev_priv(dev); 741 742 kobject_put(br->ifobj); 743 sysfs_remove_bin_file(kobj, &bridge_forward); 744 sysfs_remove_group(kobj, &bridge_group); 745 } 746