Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 1 | /* |
| 2 | * net/core/dev_addr_lists.c - Functions for handling net device lists |
| 3 | * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com> |
| 4 | * |
| 5 | * This file contains functions for working with unicast, multicast and device |
| 6 | * addresses lists. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/netdevice.h> |
| 15 | #include <linux/rtnetlink.h> |
| 16 | #include <linux/list.h> |
| 17 | |
| 18 | /* |
| 19 | * General list handling functions |
| 20 | */ |
| 21 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 22 | static int __hw_addr_add_ex(struct netdev_hw_addr_list *list, |
| 23 | unsigned char *addr, int addr_len, |
| 24 | unsigned char addr_type, bool global) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 25 | { |
| 26 | struct netdev_hw_addr *ha; |
| 27 | int alloc_size; |
| 28 | |
| 29 | if (addr_len > MAX_ADDR_LEN) |
| 30 | return -EINVAL; |
| 31 | |
| 32 | list_for_each_entry(ha, &list->list, list) { |
| 33 | if (!memcmp(ha->addr, addr, addr_len) && |
| 34 | ha->type == addr_type) { |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 35 | if (global) { |
| 36 | /* check if addr is already used as global */ |
| 37 | if (ha->global_use) |
| 38 | return 0; |
| 39 | else |
| 40 | ha->global_use = true; |
| 41 | } |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 42 | ha->refcount++; |
| 43 | return 0; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | |
| 48 | alloc_size = sizeof(*ha); |
| 49 | if (alloc_size < L1_CACHE_BYTES) |
| 50 | alloc_size = L1_CACHE_BYTES; |
| 51 | ha = kmalloc(alloc_size, GFP_ATOMIC); |
| 52 | if (!ha) |
| 53 | return -ENOMEM; |
| 54 | memcpy(ha->addr, addr, addr_len); |
| 55 | ha->type = addr_type; |
| 56 | ha->refcount = 1; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 57 | ha->global_use = global; |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 58 | ha->synced = false; |
| 59 | list_add_tail_rcu(&ha->list, &list->list); |
| 60 | list->count++; |
| 61 | return 0; |
| 62 | } |
| 63 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 64 | static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr, |
| 65 | int addr_len, unsigned char addr_type) |
| 66 | { |
| 67 | return __hw_addr_add_ex(list, addr, addr_len, addr_type, false); |
| 68 | } |
| 69 | |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 70 | static void ha_rcu_free(struct rcu_head *head) |
| 71 | { |
| 72 | struct netdev_hw_addr *ha; |
| 73 | |
| 74 | ha = container_of(head, struct netdev_hw_addr, rcu_head); |
| 75 | kfree(ha); |
| 76 | } |
| 77 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 78 | static int __hw_addr_del_ex(struct netdev_hw_addr_list *list, |
| 79 | unsigned char *addr, int addr_len, |
| 80 | unsigned char addr_type, bool global) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 81 | { |
| 82 | struct netdev_hw_addr *ha; |
| 83 | |
| 84 | list_for_each_entry(ha, &list->list, list) { |
| 85 | if (!memcmp(ha->addr, addr, addr_len) && |
| 86 | (ha->type == addr_type || !addr_type)) { |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 87 | if (global) { |
| 88 | if (!ha->global_use) |
| 89 | break; |
| 90 | else |
| 91 | ha->global_use = false; |
| 92 | } |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 93 | if (--ha->refcount) |
| 94 | return 0; |
| 95 | list_del_rcu(&ha->list); |
| 96 | call_rcu(&ha->rcu_head, ha_rcu_free); |
| 97 | list->count--; |
| 98 | return 0; |
| 99 | } |
| 100 | } |
| 101 | return -ENOENT; |
| 102 | } |
| 103 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 104 | static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr, |
| 105 | int addr_len, unsigned char addr_type) |
| 106 | { |
| 107 | return __hw_addr_del_ex(list, addr, addr_len, addr_type, false); |
| 108 | } |
| 109 | |
| 110 | int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, |
| 111 | struct netdev_hw_addr_list *from_list, |
| 112 | int addr_len, unsigned char addr_type) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 113 | { |
| 114 | int err; |
| 115 | struct netdev_hw_addr *ha, *ha2; |
| 116 | unsigned char type; |
| 117 | |
| 118 | list_for_each_entry(ha, &from_list->list, list) { |
| 119 | type = addr_type ? addr_type : ha->type; |
| 120 | err = __hw_addr_add(to_list, ha->addr, addr_len, type); |
| 121 | if (err) |
| 122 | goto unroll; |
| 123 | } |
| 124 | return 0; |
| 125 | |
| 126 | unroll: |
| 127 | list_for_each_entry(ha2, &from_list->list, list) { |
| 128 | if (ha2 == ha) |
| 129 | break; |
| 130 | type = addr_type ? addr_type : ha2->type; |
| 131 | __hw_addr_del(to_list, ha2->addr, addr_len, type); |
| 132 | } |
| 133 | return err; |
| 134 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 135 | EXPORT_SYMBOL(__hw_addr_add_multiple); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 136 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 137 | void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, |
| 138 | struct netdev_hw_addr_list *from_list, |
| 139 | int addr_len, unsigned char addr_type) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 140 | { |
| 141 | struct netdev_hw_addr *ha; |
| 142 | unsigned char type; |
| 143 | |
| 144 | list_for_each_entry(ha, &from_list->list, list) { |
| 145 | type = addr_type ? addr_type : ha->type; |
| 146 | __hw_addr_del(to_list, ha->addr, addr_len, addr_type); |
| 147 | } |
| 148 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 149 | EXPORT_SYMBOL(__hw_addr_del_multiple); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 150 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 151 | int __hw_addr_sync(struct netdev_hw_addr_list *to_list, |
| 152 | struct netdev_hw_addr_list *from_list, |
| 153 | int addr_len) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 154 | { |
| 155 | int err = 0; |
| 156 | struct netdev_hw_addr *ha, *tmp; |
| 157 | |
| 158 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
| 159 | if (!ha->synced) { |
| 160 | err = __hw_addr_add(to_list, ha->addr, |
| 161 | addr_len, ha->type); |
| 162 | if (err) |
| 163 | break; |
| 164 | ha->synced = true; |
| 165 | ha->refcount++; |
| 166 | } else if (ha->refcount == 1) { |
| 167 | __hw_addr_del(to_list, ha->addr, addr_len, ha->type); |
| 168 | __hw_addr_del(from_list, ha->addr, addr_len, ha->type); |
| 169 | } |
| 170 | } |
| 171 | return err; |
| 172 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 173 | EXPORT_SYMBOL(__hw_addr_sync); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 174 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 175 | void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, |
| 176 | struct netdev_hw_addr_list *from_list, |
| 177 | int addr_len) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 178 | { |
| 179 | struct netdev_hw_addr *ha, *tmp; |
| 180 | |
| 181 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
| 182 | if (ha->synced) { |
| 183 | __hw_addr_del(to_list, ha->addr, |
| 184 | addr_len, ha->type); |
| 185 | ha->synced = false; |
| 186 | __hw_addr_del(from_list, ha->addr, |
| 187 | addr_len, ha->type); |
| 188 | } |
| 189 | } |
| 190 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 191 | EXPORT_SYMBOL(__hw_addr_unsync); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 192 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 193 | void __hw_addr_flush(struct netdev_hw_addr_list *list) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 194 | { |
| 195 | struct netdev_hw_addr *ha, *tmp; |
| 196 | |
| 197 | list_for_each_entry_safe(ha, tmp, &list->list, list) { |
| 198 | list_del_rcu(&ha->list); |
| 199 | call_rcu(&ha->rcu_head, ha_rcu_free); |
| 200 | } |
| 201 | list->count = 0; |
| 202 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 203 | EXPORT_SYMBOL(__hw_addr_flush); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 204 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 205 | void __hw_addr_init(struct netdev_hw_addr_list *list) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 206 | { |
| 207 | INIT_LIST_HEAD(&list->list); |
| 208 | list->count = 0; |
| 209 | } |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 210 | EXPORT_SYMBOL(__hw_addr_init); |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 211 | |
| 212 | /* |
| 213 | * Device addresses handling functions |
| 214 | */ |
| 215 | |
| 216 | /** |
| 217 | * dev_addr_flush - Flush device address list |
| 218 | * @dev: device |
| 219 | * |
| 220 | * Flush device address list and reset ->dev_addr. |
| 221 | * |
| 222 | * The caller must hold the rtnl_mutex. |
| 223 | */ |
| 224 | void dev_addr_flush(struct net_device *dev) |
| 225 | { |
| 226 | /* rtnl_mutex must be held here */ |
| 227 | |
| 228 | __hw_addr_flush(&dev->dev_addrs); |
| 229 | dev->dev_addr = NULL; |
| 230 | } |
| 231 | EXPORT_SYMBOL(dev_addr_flush); |
| 232 | |
| 233 | /** |
| 234 | * dev_addr_init - Init device address list |
| 235 | * @dev: device |
| 236 | * |
| 237 | * Init device address list and create the first element, |
| 238 | * used by ->dev_addr. |
| 239 | * |
| 240 | * The caller must hold the rtnl_mutex. |
| 241 | */ |
| 242 | int dev_addr_init(struct net_device *dev) |
| 243 | { |
| 244 | unsigned char addr[MAX_ADDR_LEN]; |
| 245 | struct netdev_hw_addr *ha; |
| 246 | int err; |
| 247 | |
| 248 | /* rtnl_mutex must be held here */ |
| 249 | |
| 250 | __hw_addr_init(&dev->dev_addrs); |
| 251 | memset(addr, 0, sizeof(addr)); |
| 252 | err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), |
| 253 | NETDEV_HW_ADDR_T_LAN); |
| 254 | if (!err) { |
| 255 | /* |
| 256 | * Get the first (previously created) address from the list |
| 257 | * and set dev_addr pointer to this location. |
| 258 | */ |
| 259 | ha = list_first_entry(&dev->dev_addrs.list, |
| 260 | struct netdev_hw_addr, list); |
| 261 | dev->dev_addr = ha->addr; |
| 262 | } |
| 263 | return err; |
| 264 | } |
| 265 | EXPORT_SYMBOL(dev_addr_init); |
| 266 | |
| 267 | /** |
| 268 | * dev_addr_add - Add a device address |
| 269 | * @dev: device |
| 270 | * @addr: address to add |
| 271 | * @addr_type: address type |
| 272 | * |
| 273 | * Add a device address to the device or increase the reference count if |
| 274 | * it already exists. |
| 275 | * |
| 276 | * The caller must hold the rtnl_mutex. |
| 277 | */ |
| 278 | int dev_addr_add(struct net_device *dev, unsigned char *addr, |
| 279 | unsigned char addr_type) |
| 280 | { |
| 281 | int err; |
| 282 | |
| 283 | ASSERT_RTNL(); |
| 284 | |
| 285 | err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); |
| 286 | if (!err) |
| 287 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 288 | return err; |
| 289 | } |
| 290 | EXPORT_SYMBOL(dev_addr_add); |
| 291 | |
| 292 | /** |
| 293 | * dev_addr_del - Release a device address. |
| 294 | * @dev: device |
| 295 | * @addr: address to delete |
| 296 | * @addr_type: address type |
| 297 | * |
| 298 | * Release reference to a device address and remove it from the device |
| 299 | * if the reference count drops to zero. |
| 300 | * |
| 301 | * The caller must hold the rtnl_mutex. |
| 302 | */ |
| 303 | int dev_addr_del(struct net_device *dev, unsigned char *addr, |
| 304 | unsigned char addr_type) |
| 305 | { |
| 306 | int err; |
| 307 | struct netdev_hw_addr *ha; |
| 308 | |
| 309 | ASSERT_RTNL(); |
| 310 | |
| 311 | /* |
| 312 | * We can not remove the first address from the list because |
| 313 | * dev->dev_addr points to that. |
| 314 | */ |
| 315 | ha = list_first_entry(&dev->dev_addrs.list, |
| 316 | struct netdev_hw_addr, list); |
| 317 | if (ha->addr == dev->dev_addr && ha->refcount == 1) |
| 318 | return -ENOENT; |
| 319 | |
| 320 | err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, |
| 321 | addr_type); |
| 322 | if (!err) |
| 323 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
| 324 | return err; |
| 325 | } |
| 326 | EXPORT_SYMBOL(dev_addr_del); |
| 327 | |
| 328 | /** |
| 329 | * dev_addr_add_multiple - Add device addresses from another device |
| 330 | * @to_dev: device to which addresses will be added |
| 331 | * @from_dev: device from which addresses will be added |
| 332 | * @addr_type: address type - 0 means type will be used from from_dev |
| 333 | * |
| 334 | * Add device addresses of the one device to another. |
| 335 | ** |
| 336 | * The caller must hold the rtnl_mutex. |
| 337 | */ |
| 338 | int dev_addr_add_multiple(struct net_device *to_dev, |
| 339 | struct net_device *from_dev, |
| 340 | unsigned char addr_type) |
| 341 | { |
| 342 | int err; |
| 343 | |
| 344 | ASSERT_RTNL(); |
| 345 | |
| 346 | if (from_dev->addr_len != to_dev->addr_len) |
| 347 | return -EINVAL; |
| 348 | err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
| 349 | to_dev->addr_len, addr_type); |
| 350 | if (!err) |
| 351 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); |
| 352 | return err; |
| 353 | } |
| 354 | EXPORT_SYMBOL(dev_addr_add_multiple); |
| 355 | |
| 356 | /** |
| 357 | * dev_addr_del_multiple - Delete device addresses by another device |
| 358 | * @to_dev: device where the addresses will be deleted |
| 359 | * @from_dev: device by which addresses the addresses will be deleted |
| 360 | * @addr_type: address type - 0 means type will used from from_dev |
| 361 | * |
| 362 | * Deletes addresses in to device by the list of addresses in from device. |
| 363 | * |
| 364 | * The caller must hold the rtnl_mutex. |
| 365 | */ |
| 366 | int dev_addr_del_multiple(struct net_device *to_dev, |
| 367 | struct net_device *from_dev, |
| 368 | unsigned char addr_type) |
| 369 | { |
| 370 | ASSERT_RTNL(); |
| 371 | |
| 372 | if (from_dev->addr_len != to_dev->addr_len) |
| 373 | return -EINVAL; |
| 374 | __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
| 375 | to_dev->addr_len, addr_type); |
| 376 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); |
| 377 | return 0; |
| 378 | } |
| 379 | EXPORT_SYMBOL(dev_addr_del_multiple); |
| 380 | |
| 381 | /* |
| 382 | * Unicast list handling functions |
| 383 | */ |
| 384 | |
| 385 | /** |
| 386 | * dev_uc_add - Add a secondary unicast address |
| 387 | * @dev: device |
| 388 | * @addr: address to add |
| 389 | * |
| 390 | * Add a secondary unicast address to the device or increase |
| 391 | * the reference count if it already exists. |
| 392 | */ |
| 393 | int dev_uc_add(struct net_device *dev, unsigned char *addr) |
| 394 | { |
| 395 | int err; |
| 396 | |
| 397 | netif_addr_lock_bh(dev); |
| 398 | err = __hw_addr_add(&dev->uc, addr, dev->addr_len, |
| 399 | NETDEV_HW_ADDR_T_UNICAST); |
| 400 | if (!err) |
| 401 | __dev_set_rx_mode(dev); |
| 402 | netif_addr_unlock_bh(dev); |
| 403 | return err; |
| 404 | } |
| 405 | EXPORT_SYMBOL(dev_uc_add); |
| 406 | |
| 407 | /** |
| 408 | * dev_uc_del - Release secondary unicast address. |
| 409 | * @dev: device |
| 410 | * @addr: address to delete |
| 411 | * |
| 412 | * Release reference to a secondary unicast address and remove it |
| 413 | * from the device if the reference count drops to zero. |
| 414 | */ |
| 415 | int dev_uc_del(struct net_device *dev, unsigned char *addr) |
| 416 | { |
| 417 | int err; |
| 418 | |
| 419 | netif_addr_lock_bh(dev); |
| 420 | err = __hw_addr_del(&dev->uc, addr, dev->addr_len, |
| 421 | NETDEV_HW_ADDR_T_UNICAST); |
| 422 | if (!err) |
| 423 | __dev_set_rx_mode(dev); |
| 424 | netif_addr_unlock_bh(dev); |
| 425 | return err; |
| 426 | } |
| 427 | EXPORT_SYMBOL(dev_uc_del); |
| 428 | |
| 429 | /** |
| 430 | * dev_uc_sync - Synchronize device's unicast list to another device |
| 431 | * @to: destination device |
| 432 | * @from: source device |
| 433 | * |
| 434 | * Add newly added addresses to the destination device and release |
| 435 | * addresses that have no users left. The source device must be |
| 436 | * locked by netif_tx_lock_bh. |
| 437 | * |
| 438 | * This function is intended to be called from the dev->set_rx_mode |
| 439 | * function of layered software devices. |
| 440 | */ |
| 441 | int dev_uc_sync(struct net_device *to, struct net_device *from) |
| 442 | { |
| 443 | int err = 0; |
| 444 | |
| 445 | if (to->addr_len != from->addr_len) |
| 446 | return -EINVAL; |
| 447 | |
| 448 | netif_addr_lock_bh(to); |
| 449 | err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); |
| 450 | if (!err) |
| 451 | __dev_set_rx_mode(to); |
| 452 | netif_addr_unlock_bh(to); |
| 453 | return err; |
| 454 | } |
| 455 | EXPORT_SYMBOL(dev_uc_sync); |
| 456 | |
| 457 | /** |
| 458 | * dev_uc_unsync - Remove synchronized addresses from the destination device |
| 459 | * @to: destination device |
| 460 | * @from: source device |
| 461 | * |
| 462 | * Remove all addresses that were added to the destination device by |
| 463 | * dev_uc_sync(). This function is intended to be called from the |
| 464 | * dev->stop function of layered software devices. |
| 465 | */ |
| 466 | void dev_uc_unsync(struct net_device *to, struct net_device *from) |
| 467 | { |
| 468 | if (to->addr_len != from->addr_len) |
| 469 | return; |
| 470 | |
| 471 | netif_addr_lock_bh(from); |
| 472 | netif_addr_lock(to); |
| 473 | __hw_addr_unsync(&to->uc, &from->uc, to->addr_len); |
| 474 | __dev_set_rx_mode(to); |
| 475 | netif_addr_unlock(to); |
| 476 | netif_addr_unlock_bh(from); |
| 477 | } |
| 478 | EXPORT_SYMBOL(dev_uc_unsync); |
| 479 | |
| 480 | /** |
| 481 | * dev_uc_flush - Flush unicast addresses |
| 482 | * @dev: device |
| 483 | * |
| 484 | * Flush unicast addresses. |
| 485 | */ |
| 486 | void dev_uc_flush(struct net_device *dev) |
| 487 | { |
| 488 | netif_addr_lock_bh(dev); |
| 489 | __hw_addr_flush(&dev->uc); |
| 490 | netif_addr_unlock_bh(dev); |
| 491 | } |
| 492 | EXPORT_SYMBOL(dev_uc_flush); |
| 493 | |
| 494 | /** |
| 495 | * dev_uc_flush - Init unicast address list |
| 496 | * @dev: device |
| 497 | * |
| 498 | * Init unicast address list. |
| 499 | */ |
| 500 | void dev_uc_init(struct net_device *dev) |
| 501 | { |
| 502 | __hw_addr_init(&dev->uc); |
| 503 | } |
| 504 | EXPORT_SYMBOL(dev_uc_init); |
| 505 | |
| 506 | /* |
| 507 | * Multicast list handling functions |
| 508 | */ |
| 509 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 510 | static int __dev_mc_add(struct net_device *dev, unsigned char *addr, |
| 511 | bool global) |
| 512 | { |
| 513 | int err; |
| 514 | |
| 515 | netif_addr_lock_bh(dev); |
| 516 | err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len, |
| 517 | NETDEV_HW_ADDR_T_MULTICAST, global); |
| 518 | if (!err) |
| 519 | __dev_set_rx_mode(dev); |
| 520 | netif_addr_unlock_bh(dev); |
| 521 | return err; |
| 522 | } |
| 523 | /** |
| 524 | * dev_mc_add - Add a multicast address |
| 525 | * @dev: device |
| 526 | * @addr: address to add |
| 527 | * |
| 528 | * Add a multicast address to the device or increase |
| 529 | * the reference count if it already exists. |
| 530 | */ |
| 531 | int dev_mc_add(struct net_device *dev, unsigned char *addr) |
| 532 | { |
| 533 | return __dev_mc_add(dev, addr, false); |
| 534 | } |
| 535 | EXPORT_SYMBOL(dev_mc_add); |
| 536 | |
| 537 | /** |
| 538 | * dev_mc_add_global - Add a global multicast address |
| 539 | * @dev: device |
| 540 | * @addr: address to add |
| 541 | * |
| 542 | * Add a global multicast address to the device. |
| 543 | */ |
| 544 | int dev_mc_add_global(struct net_device *dev, unsigned char *addr) |
| 545 | { |
| 546 | return __dev_mc_add(dev, addr, true); |
| 547 | } |
| 548 | EXPORT_SYMBOL(dev_mc_add_global); |
| 549 | |
| 550 | static int __dev_mc_del(struct net_device *dev, unsigned char *addr, |
| 551 | bool global) |
| 552 | { |
| 553 | int err; |
| 554 | |
| 555 | netif_addr_lock_bh(dev); |
| 556 | err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len, |
| 557 | NETDEV_HW_ADDR_T_MULTICAST, global); |
| 558 | if (!err) |
| 559 | __dev_set_rx_mode(dev); |
| 560 | netif_addr_unlock_bh(dev); |
| 561 | return err; |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * dev_mc_del - Delete a multicast address. |
| 566 | * @dev: device |
| 567 | * @addr: address to delete |
| 568 | * |
| 569 | * Release reference to a multicast address and remove it |
| 570 | * from the device if the reference count drops to zero. |
| 571 | */ |
| 572 | int dev_mc_del(struct net_device *dev, unsigned char *addr) |
| 573 | { |
| 574 | return __dev_mc_del(dev, addr, false); |
| 575 | } |
| 576 | EXPORT_SYMBOL(dev_mc_del); |
| 577 | |
| 578 | /** |
| 579 | * dev_mc_del_global - Delete a global multicast address. |
| 580 | * @dev: device |
| 581 | * @addr: address to delete |
| 582 | * |
| 583 | * Release reference to a multicast address and remove it |
| 584 | * from the device if the reference count drops to zero. |
| 585 | */ |
| 586 | int dev_mc_del_global(struct net_device *dev, unsigned char *addr) |
| 587 | { |
| 588 | return __dev_mc_del(dev, addr, true); |
| 589 | } |
| 590 | EXPORT_SYMBOL(dev_mc_del_global); |
| 591 | |
| 592 | /** |
| 593 | * dev_mc_sync - Synchronize device's unicast list to another device |
| 594 | * @to: destination device |
| 595 | * @from: source device |
| 596 | * |
| 597 | * Add newly added addresses to the destination device and release |
| 598 | * addresses that have no users left. The source device must be |
| 599 | * locked by netif_tx_lock_bh. |
| 600 | * |
| 601 | * This function is intended to be called from the dev->set_multicast_list |
| 602 | * or dev->set_rx_mode function of layered software devices. |
| 603 | */ |
| 604 | int dev_mc_sync(struct net_device *to, struct net_device *from) |
| 605 | { |
| 606 | int err = 0; |
| 607 | |
| 608 | if (to->addr_len != from->addr_len) |
| 609 | return -EINVAL; |
| 610 | |
| 611 | netif_addr_lock_bh(to); |
| 612 | err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len); |
| 613 | if (!err) |
| 614 | __dev_set_rx_mode(to); |
| 615 | netif_addr_unlock_bh(to); |
| 616 | return err; |
| 617 | } |
| 618 | EXPORT_SYMBOL(dev_mc_sync); |
| 619 | |
| 620 | /** |
| 621 | * dev_mc_unsync - Remove synchronized addresses from the destination device |
| 622 | * @to: destination device |
| 623 | * @from: source device |
| 624 | * |
| 625 | * Remove all addresses that were added to the destination device by |
| 626 | * dev_mc_sync(). This function is intended to be called from the |
| 627 | * dev->stop function of layered software devices. |
| 628 | */ |
| 629 | void dev_mc_unsync(struct net_device *to, struct net_device *from) |
| 630 | { |
| 631 | if (to->addr_len != from->addr_len) |
| 632 | return; |
| 633 | |
| 634 | netif_addr_lock_bh(from); |
| 635 | netif_addr_lock(to); |
| 636 | __hw_addr_unsync(&to->mc, &from->mc, to->addr_len); |
| 637 | __dev_set_rx_mode(to); |
| 638 | netif_addr_unlock(to); |
| 639 | netif_addr_unlock_bh(from); |
| 640 | } |
| 641 | EXPORT_SYMBOL(dev_mc_unsync); |
| 642 | |
| 643 | /** |
| 644 | * dev_mc_flush - Flush multicast addresses |
| 645 | * @dev: device |
| 646 | * |
| 647 | * Flush multicast addresses. |
| 648 | */ |
| 649 | void dev_mc_flush(struct net_device *dev) |
| 650 | { |
| 651 | netif_addr_lock_bh(dev); |
| 652 | __hw_addr_flush(&dev->mc); |
| 653 | netif_addr_unlock_bh(dev); |
| 654 | } |
| 655 | EXPORT_SYMBOL(dev_mc_flush); |
| 656 | |
| 657 | /** |
| 658 | * dev_mc_flush - Init multicast address list |
| 659 | * @dev: device |
| 660 | * |
| 661 | * Init multicast address list. |
| 662 | */ |
| 663 | void dev_mc_init(struct net_device *dev) |
| 664 | { |
| 665 | __hw_addr_init(&dev->mc); |
| 666 | } |
| 667 | EXPORT_SYMBOL(dev_mc_init); |
| 668 | |
| 669 | #ifdef CONFIG_PROC_FS |
| 670 | #include <linux/proc_fs.h> |
| 671 | #include <linux/seq_file.h> |
| 672 | |
| 673 | static int dev_mc_seq_show(struct seq_file *seq, void *v) |
| 674 | { |
| 675 | struct netdev_hw_addr *ha; |
| 676 | struct net_device *dev = v; |
| 677 | |
| 678 | if (v == SEQ_START_TOKEN) |
| 679 | return 0; |
| 680 | |
| 681 | netif_addr_lock_bh(dev); |
| 682 | netdev_for_each_mc_addr(ha, dev) { |
| 683 | int i; |
| 684 | |
| 685 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, |
| 686 | dev->name, ha->refcount, ha->global_use); |
| 687 | |
| 688 | for (i = 0; i < dev->addr_len; i++) |
| 689 | seq_printf(seq, "%02x", ha->addr[i]); |
| 690 | |
| 691 | seq_putc(seq, '\n'); |
| 692 | } |
| 693 | netif_addr_unlock_bh(dev); |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | static const struct seq_operations dev_mc_seq_ops = { |
| 698 | .start = dev_seq_start, |
| 699 | .next = dev_seq_next, |
| 700 | .stop = dev_seq_stop, |
| 701 | .show = dev_mc_seq_show, |
| 702 | }; |
| 703 | |
| 704 | static int dev_mc_seq_open(struct inode *inode, struct file *file) |
| 705 | { |
| 706 | return seq_open_net(inode, file, &dev_mc_seq_ops, |
| 707 | sizeof(struct seq_net_private)); |
| 708 | } |
| 709 | |
| 710 | static const struct file_operations dev_mc_seq_fops = { |
| 711 | .owner = THIS_MODULE, |
| 712 | .open = dev_mc_seq_open, |
| 713 | .read = seq_read, |
| 714 | .llseek = seq_lseek, |
| 715 | .release = seq_release_net, |
| 716 | }; |
| 717 | |
| 718 | #endif |
| 719 | |
| 720 | static int __net_init dev_mc_net_init(struct net *net) |
| 721 | { |
| 722 | if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) |
| 723 | return -ENOMEM; |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | static void __net_exit dev_mc_net_exit(struct net *net) |
| 728 | { |
| 729 | proc_net_remove(net, "dev_mcast"); |
| 730 | } |
| 731 | |
| 732 | static struct pernet_operations __net_initdata dev_mc_net_ops = { |
| 733 | .init = dev_mc_net_init, |
| 734 | .exit = dev_mc_net_exit, |
| 735 | }; |
| 736 | |
| 737 | void __init dev_mcast_init(void) |
| 738 | { |
| 739 | register_pernet_subsys(&dev_mc_net_ops); |
| 740 | } |
| 741 | |