Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 1 | /* |
| 2 | * WiMedia Logical Link Control Protocol (WLP) |
| 3 | * |
| 4 | * Copyright (C) 2007 Intel Corporation |
| 5 | * Reinette Chatre <reinette.chatre@intel.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version |
| 9 | * 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 19 | * 02110-1301, USA. |
| 20 | * |
| 21 | * |
| 22 | * Implementation of the WLP association protocol. |
| 23 | * |
| 24 | * FIXME: Docs |
| 25 | * |
| 26 | * A UWB network interface will configure a WSS through wlp_wss_setup() after |
| 27 | * the interface has been assigned a MAC address, typically after |
| 28 | * "ifconfig" has been called. When the interface goes down it should call |
| 29 | * wlp_wss_remove(). |
| 30 | * |
| 31 | * When the WSS is ready for use the user interacts via sysfs to create, |
| 32 | * discover, and activate WSS. |
| 33 | * |
| 34 | * wlp_wss_enroll_activate() |
| 35 | * |
| 36 | * wlp_wss_create_activate() |
| 37 | * wlp_wss_set_wssid_hash() |
| 38 | * wlp_wss_comp_wssid_hash() |
| 39 | * wlp_wss_sel_bcast_addr() |
| 40 | * wlp_wss_sysfs_add() |
| 41 | * |
| 42 | * Called when no more references to WSS exist: |
| 43 | * wlp_wss_release() |
| 44 | * wlp_wss_reset() |
| 45 | */ |
| 46 | |
| 47 | #include <linux/etherdevice.h> /* for is_valid_ether_addr */ |
| 48 | #include <linux/skbuff.h> |
| 49 | #include <linux/wlp.h> |
| 50 | #define D_LOCAL 5 |
| 51 | #include <linux/uwb/debug.h> |
| 52 | #include "wlp-internal.h" |
| 53 | |
| 54 | |
| 55 | size_t wlp_wss_key_print(char *buf, size_t bufsize, u8 *key) |
| 56 | { |
| 57 | size_t result; |
| 58 | |
| 59 | result = scnprintf(buf, bufsize, |
| 60 | "%02x %02x %02x %02x %02x %02x " |
| 61 | "%02x %02x %02x %02x %02x %02x " |
| 62 | "%02x %02x %02x %02x", |
| 63 | key[0], key[1], key[2], key[3], |
| 64 | key[4], key[5], key[6], key[7], |
| 65 | key[8], key[9], key[10], key[11], |
| 66 | key[12], key[13], key[14], key[15]); |
| 67 | return result; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Compute WSSID hash |
| 72 | * WLP Draft 0.99 [7.2.1] |
| 73 | * |
| 74 | * The WSSID hash for a WSSID is the result of an octet-wise exclusive-OR |
| 75 | * of all octets in the WSSID. |
| 76 | */ |
| 77 | static |
| 78 | u8 wlp_wss_comp_wssid_hash(struct wlp_uuid *wssid) |
| 79 | { |
| 80 | return wssid->data[0] ^ wssid->data[1] ^ wssid->data[2] |
| 81 | ^ wssid->data[3] ^ wssid->data[4] ^ wssid->data[5] |
| 82 | ^ wssid->data[6] ^ wssid->data[7] ^ wssid->data[8] |
| 83 | ^ wssid->data[9] ^ wssid->data[10] ^ wssid->data[11] |
| 84 | ^ wssid->data[12] ^ wssid->data[13] ^ wssid->data[14] |
| 85 | ^ wssid->data[15]; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Select a multicast EUI-48 for the WSS broadcast address. |
| 90 | * WLP Draft 0.99 [7.2.1] |
| 91 | * |
| 92 | * Selected based on the WiMedia Alliance OUI, 00-13-88, within the WLP |
| 93 | * range, [01-13-88-00-01-00, 01-13-88-00-01-FF] inclusive. |
| 94 | * |
| 95 | * This address is currently hardcoded. |
| 96 | * FIXME? |
| 97 | */ |
| 98 | static |
| 99 | struct uwb_mac_addr wlp_wss_sel_bcast_addr(struct wlp_wss *wss) |
| 100 | { |
| 101 | struct uwb_mac_addr bcast = { |
| 102 | .data = { 0x01, 0x13, 0x88, 0x00, 0x01, 0x00 } |
| 103 | }; |
| 104 | return bcast; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Clear the contents of the WSS structure - all except kobj, mutex, virtual |
| 109 | * |
| 110 | * We do not want to reinitialize - the internal kobj should not change as |
| 111 | * it still points to the parent received during setup. The mutex should |
| 112 | * remain also. We thus just reset values individually. |
| 113 | * The virutal address assigned to WSS will remain the same for the |
| 114 | * lifetime of the WSS. We only reset the fields that can change during its |
| 115 | * lifetime. |
| 116 | */ |
| 117 | void wlp_wss_reset(struct wlp_wss *wss) |
| 118 | { |
| 119 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 120 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 121 | d_fnstart(5, dev, "wss (%p) \n", wss); |
| 122 | memset(&wss->wssid, 0, sizeof(wss->wssid)); |
| 123 | wss->hash = 0; |
| 124 | memset(&wss->name[0], 0, sizeof(wss->name)); |
| 125 | memset(&wss->bcast, 0, sizeof(wss->bcast)); |
| 126 | wss->secure_status = WLP_WSS_UNSECURE; |
| 127 | memset(&wss->master_key[0], 0, sizeof(wss->master_key)); |
| 128 | wss->tag = 0; |
| 129 | wss->state = WLP_WSS_STATE_NONE; |
| 130 | d_fnend(5, dev, "wss (%p) \n", wss); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Create sysfs infrastructure for WSS |
| 135 | * |
| 136 | * The WSS is configured to have the interface as parent (see wlp_wss_setup()) |
| 137 | * a new sysfs directory that includes wssid as its name is created in the |
| 138 | * interface's sysfs directory. The group of files interacting with WSS are |
| 139 | * created also. |
| 140 | */ |
| 141 | static |
| 142 | int wlp_wss_sysfs_add(struct wlp_wss *wss, char *wssid_str) |
| 143 | { |
| 144 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 145 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 146 | int result; |
| 147 | |
| 148 | d_fnstart(5, dev, "wss (%p), wssid: %s\n", wss, wssid_str); |
| 149 | result = kobject_set_name(&wss->kobj, "wss-%s", wssid_str); |
| 150 | if (result < 0) |
| 151 | return result; |
| 152 | wss->kobj.ktype = &wss_ktype; |
| 153 | result = kobject_init_and_add(&wss->kobj, |
| 154 | &wss_ktype, wss->kobj.parent, "wlp"); |
| 155 | if (result < 0) { |
| 156 | dev_err(dev, "WLP: Cannot register WSS kobject.\n"); |
| 157 | goto error_kobject_register; |
| 158 | } |
| 159 | result = sysfs_create_group(&wss->kobj, &wss_attr_group); |
| 160 | if (result < 0) { |
| 161 | dev_err(dev, "WLP: Cannot register WSS attributes: %d\n", |
| 162 | result); |
| 163 | goto error_sysfs_create_group; |
| 164 | } |
| 165 | d_fnend(5, dev, "Completed. result = %d \n", result); |
| 166 | return 0; |
| 167 | error_sysfs_create_group: |
| 168 | |
| 169 | kobject_put(&wss->kobj); /* will free name if needed */ |
| 170 | return result; |
| 171 | error_kobject_register: |
| 172 | kfree(wss->kobj.name); |
| 173 | wss->kobj.name = NULL; |
| 174 | wss->kobj.ktype = NULL; |
| 175 | return result; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /** |
| 180 | * Release WSS |
| 181 | * |
| 182 | * No more references exist to this WSS. We should undo everything that was |
| 183 | * done in wlp_wss_create_activate() except removing the group. The group |
| 184 | * is not removed because an object can be unregistered before the group is |
| 185 | * created. We also undo any additional operations on the WSS after this |
| 186 | * (addition of members). |
| 187 | * |
| 188 | * If memory was allocated for the kobject's name then it will |
| 189 | * be freed by the kobject system during this time. |
| 190 | * |
| 191 | * The EDA cache is removed and reinitilized when the WSS is removed. We |
| 192 | * thus loose knowledge of members of this WSS at that time and need not do |
| 193 | * it here. |
| 194 | */ |
| 195 | void wlp_wss_release(struct kobject *kobj) |
| 196 | { |
| 197 | struct wlp_wss *wss = container_of(kobj, struct wlp_wss, kobj); |
| 198 | |
| 199 | wlp_wss_reset(wss); |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Enroll into a WSS using provided neighbor as registrar |
| 204 | * |
| 205 | * First search the neighborhood information to learn which neighbor is |
| 206 | * referred to, next proceed with enrollment. |
| 207 | * |
| 208 | * &wss->mutex is held |
| 209 | */ |
| 210 | static |
| 211 | int wlp_wss_enroll_target(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 212 | struct uwb_dev_addr *dest) |
| 213 | { |
| 214 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 215 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 216 | struct wlp_neighbor_e *neighbor; |
| 217 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 218 | int result = -ENXIO; |
| 219 | struct uwb_dev_addr *dev_addr; |
| 220 | |
| 221 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
| 222 | d_fnstart(5, dev, "wss %p, wssid %s, registrar %02x:%02x \n", |
| 223 | wss, buf, dest->data[1], dest->data[0]); |
| 224 | mutex_lock(&wlp->nbmutex); |
| 225 | list_for_each_entry(neighbor, &wlp->neighbors, node) { |
| 226 | dev_addr = &neighbor->uwb_dev->dev_addr; |
| 227 | if (!memcmp(dest, dev_addr, sizeof(*dest))) { |
| 228 | d_printf(5, dev, "Neighbor %02x:%02x is valid, " |
| 229 | "enrolling. \n", |
| 230 | dev_addr->data[1], dev_addr->data[0]); |
| 231 | result = wlp_enroll_neighbor(wlp, neighbor, wss, |
| 232 | wssid); |
| 233 | break; |
| 234 | } |
| 235 | } |
| 236 | if (result == -ENXIO) |
| 237 | dev_err(dev, "WLP: Cannot find neighbor %02x:%02x. \n", |
| 238 | dest->data[1], dest->data[0]); |
| 239 | mutex_unlock(&wlp->nbmutex); |
| 240 | d_fnend(5, dev, "wss %p, wssid %s, registrar %02x:%02x, result %d \n", |
| 241 | wss, buf, dest->data[1], dest->data[0], result); |
| 242 | return result; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Enroll into a WSS previously discovered |
| 247 | * |
| 248 | * User provides WSSID of WSS, search for neighbor that has this WSS |
| 249 | * activated and attempt to enroll. |
| 250 | * |
| 251 | * &wss->mutex is held |
| 252 | */ |
| 253 | static |
| 254 | int wlp_wss_enroll_discovered(struct wlp_wss *wss, struct wlp_uuid *wssid) |
| 255 | { |
| 256 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 257 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 258 | struct wlp_neighbor_e *neighbor; |
| 259 | struct wlp_wssid_e *wssid_e; |
| 260 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 261 | int result = -ENXIO; |
| 262 | |
| 263 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
| 264 | d_fnstart(5, dev, "wss %p, wssid %s \n", wss, buf); |
| 265 | mutex_lock(&wlp->nbmutex); |
| 266 | list_for_each_entry(neighbor, &wlp->neighbors, node) { |
| 267 | list_for_each_entry(wssid_e, &neighbor->wssid, node) { |
| 268 | if (!memcmp(wssid, &wssid_e->wssid, sizeof(*wssid))) { |
| 269 | d_printf(5, dev, "Found WSSID %s in neighbor " |
| 270 | "%02x:%02x cache. \n", buf, |
| 271 | neighbor->uwb_dev->dev_addr.data[1], |
| 272 | neighbor->uwb_dev->dev_addr.data[0]); |
| 273 | result = wlp_enroll_neighbor(wlp, neighbor, |
| 274 | wss, wssid); |
| 275 | if (result == 0) /* enrollment success */ |
| 276 | goto out; |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | } |
| 281 | out: |
| 282 | if (result == -ENXIO) |
| 283 | dev_err(dev, "WLP: Cannot find WSSID %s in cache. \n", buf); |
| 284 | mutex_unlock(&wlp->nbmutex); |
| 285 | d_fnend(5, dev, "wss %p, wssid %s, result %d \n", wss, buf, result); |
| 286 | return result; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Enroll into WSS with provided WSSID, registrar may be provided |
| 291 | * |
| 292 | * @wss: out WSS that will be enrolled |
| 293 | * @wssid: wssid of neighboring WSS that we want to enroll in |
| 294 | * @devaddr: registrar can be specified, will be broadcast (ff:ff) if any |
| 295 | * neighbor can be used as registrar. |
| 296 | * |
| 297 | * &wss->mutex is held |
| 298 | */ |
| 299 | static |
| 300 | int wlp_wss_enroll(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 301 | struct uwb_dev_addr *devaddr) |
| 302 | { |
| 303 | int result; |
| 304 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 305 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 306 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 307 | struct uwb_dev_addr bcast = {.data = {0xff, 0xff} }; |
| 308 | |
| 309 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
| 310 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 311 | dev_err(dev, "WLP: Already enrolled in WSS %s.\n", buf); |
| 312 | result = -EEXIST; |
| 313 | goto error; |
| 314 | } |
| 315 | if (!memcmp(&bcast, devaddr, sizeof(bcast))) { |
| 316 | d_printf(5, dev, "Request to enroll in discovered WSS " |
| 317 | "with WSSID %s \n", buf); |
| 318 | result = wlp_wss_enroll_discovered(wss, wssid); |
| 319 | } else { |
| 320 | d_printf(5, dev, "Request to enroll in WSSID %s with " |
| 321 | "registrar %02x:%02x\n", buf, devaddr->data[1], |
| 322 | devaddr->data[0]); |
| 323 | result = wlp_wss_enroll_target(wss, wssid, devaddr); |
| 324 | } |
| 325 | if (result < 0) { |
| 326 | dev_err(dev, "WLP: Unable to enroll into WSS %s, result %d \n", |
| 327 | buf, result); |
| 328 | goto error; |
| 329 | } |
| 330 | d_printf(2, dev, "Successfully enrolled into WSS %s \n", buf); |
| 331 | result = wlp_wss_sysfs_add(wss, buf); |
| 332 | if (result < 0) { |
| 333 | dev_err(dev, "WLP: Unable to set up sysfs for WSS kobject.\n"); |
| 334 | wlp_wss_reset(wss); |
| 335 | } |
| 336 | error: |
| 337 | return result; |
| 338 | |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * Activate given WSS |
| 343 | * |
| 344 | * Prior to activation a WSS must be enrolled. To activate a WSS a device |
| 345 | * includes the WSS hash in the WLP IE in its beacon in each superframe. |
| 346 | * WLP 0.99 [7.2.5]. |
| 347 | * |
| 348 | * The WSS tag is also computed at this time. We only support one activated |
| 349 | * WSS so we can use the hash as a tag - there will never be a conflict. |
| 350 | * |
| 351 | * We currently only support one activated WSS so only one WSS hash is |
| 352 | * included in the WLP IE. |
| 353 | */ |
| 354 | static |
| 355 | int wlp_wss_activate(struct wlp_wss *wss) |
| 356 | { |
| 357 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 358 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 359 | struct uwb_rc *uwb_rc = wlp->rc; |
| 360 | int result; |
| 361 | struct { |
| 362 | struct wlp_ie wlp_ie; |
| 363 | u8 hash; /* only include one hash */ |
| 364 | } ie_data; |
| 365 | |
| 366 | d_fnstart(5, dev, "Activating WSS %p. \n", wss); |
| 367 | BUG_ON(wss->state != WLP_WSS_STATE_ENROLLED); |
| 368 | wss->hash = wlp_wss_comp_wssid_hash(&wss->wssid); |
| 369 | wss->tag = wss->hash; |
| 370 | memset(&ie_data, 0, sizeof(ie_data)); |
| 371 | ie_data.wlp_ie.hdr.element_id = UWB_IE_WLP; |
| 372 | ie_data.wlp_ie.hdr.length = sizeof(ie_data) - sizeof(struct uwb_ie_hdr); |
| 373 | wlp_ie_set_hash_length(&ie_data.wlp_ie, sizeof(ie_data.hash)); |
| 374 | ie_data.hash = wss->hash; |
| 375 | result = uwb_rc_ie_add(uwb_rc, &ie_data.wlp_ie.hdr, |
| 376 | sizeof(ie_data)); |
| 377 | if (result < 0) { |
| 378 | dev_err(dev, "WLP: Unable to add WLP IE to beacon. " |
| 379 | "result = %d.\n", result); |
| 380 | goto error_wlp_ie; |
| 381 | } |
| 382 | wss->state = WLP_WSS_STATE_ACTIVE; |
| 383 | result = 0; |
| 384 | error_wlp_ie: |
| 385 | d_fnend(5, dev, "Activating WSS %p, result = %d \n", wss, result); |
| 386 | return result; |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Enroll in and activate WSS identified by provided WSSID |
| 391 | * |
| 392 | * The neighborhood cache should contain a list of all neighbors and the |
| 393 | * WSS they have activated. Based on that cache we search which neighbor we |
| 394 | * can perform the association process with. The user also has option to |
| 395 | * specify which neighbor it prefers as registrar. |
| 396 | * Successful enrollment is followed by activation. |
| 397 | * Successful activation will create the sysfs directory containing |
| 398 | * specific information regarding this WSS. |
| 399 | */ |
| 400 | int wlp_wss_enroll_activate(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 401 | struct uwb_dev_addr *devaddr) |
| 402 | { |
| 403 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 404 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 405 | int result = 0; |
| 406 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 407 | |
| 408 | d_fnstart(5, dev, "Enrollment and activation requested. \n"); |
| 409 | mutex_lock(&wss->mutex); |
| 410 | result = wlp_wss_enroll(wss, wssid, devaddr); |
| 411 | if (result < 0) { |
| 412 | wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid); |
| 413 | dev_err(dev, "WLP: Enrollment into WSS %s failed.\n", buf); |
| 414 | goto error_enroll; |
| 415 | } |
| 416 | result = wlp_wss_activate(wss); |
| 417 | if (result < 0) { |
| 418 | dev_err(dev, "WLP: Unable to activate WSS. Undoing enrollment " |
| 419 | "result = %d \n", result); |
| 420 | /* Undo enrollment */ |
| 421 | wlp_wss_reset(wss); |
| 422 | goto error_activate; |
| 423 | } |
| 424 | error_activate: |
| 425 | error_enroll: |
| 426 | mutex_unlock(&wss->mutex); |
| 427 | d_fnend(5, dev, "Completed. result = %d \n", result); |
| 428 | return result; |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * Create, enroll, and activate a new WSS |
| 433 | * |
| 434 | * @wssid: new wssid provided by user |
| 435 | * @name: WSS name requested by used. |
| 436 | * @sec_status: security status requested by user |
| 437 | * |
| 438 | * A user requested the creation of a new WSS. All operations are done |
| 439 | * locally. The new WSS will be stored locally, the hash will be included |
| 440 | * in the WLP IE, and the sysfs infrastructure for this WSS will be |
| 441 | * created. |
| 442 | */ |
| 443 | int wlp_wss_create_activate(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 444 | char *name, unsigned sec_status, unsigned accept) |
| 445 | { |
| 446 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 447 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 448 | int result = 0; |
| 449 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 450 | d_fnstart(5, dev, "Request to create new WSS.\n"); |
| 451 | result = wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
| 452 | d_printf(5, dev, "Request to create WSS: WSSID=%s, name=%s, " |
| 453 | "sec_status=%u, accepting enrollment=%u \n", |
| 454 | buf, name, sec_status, accept); |
| 455 | if (!mutex_trylock(&wss->mutex)) { |
| 456 | dev_err(dev, "WLP: WLP association session in progress.\n"); |
| 457 | return -EBUSY; |
| 458 | } |
| 459 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 460 | dev_err(dev, "WLP: WSS already exists. Not creating new.\n"); |
| 461 | result = -EEXIST; |
| 462 | goto out; |
| 463 | } |
| 464 | if (wss->kobj.parent == NULL) { |
| 465 | dev_err(dev, "WLP: WSS parent not ready. Is network interface " |
| 466 | "up?\n"); |
| 467 | result = -ENXIO; |
| 468 | goto out; |
| 469 | } |
| 470 | if (sec_status == WLP_WSS_SECURE) { |
| 471 | dev_err(dev, "WLP: FIXME Creation of secure WSS not " |
| 472 | "supported yet.\n"); |
| 473 | result = -EINVAL; |
| 474 | goto out; |
| 475 | } |
| 476 | wss->wssid = *wssid; |
| 477 | memcpy(wss->name, name, sizeof(wss->name)); |
| 478 | wss->bcast = wlp_wss_sel_bcast_addr(wss); |
| 479 | wss->secure_status = sec_status; |
| 480 | wss->accept_enroll = accept; |
| 481 | /*wss->virtual_addr is initialized in call to wlp_wss_setup*/ |
| 482 | /* sysfs infrastructure */ |
| 483 | result = wlp_wss_sysfs_add(wss, buf); |
| 484 | if (result < 0) { |
| 485 | dev_err(dev, "Cannot set up sysfs for WSS kobject.\n"); |
| 486 | wlp_wss_reset(wss); |
| 487 | goto out; |
| 488 | } else |
| 489 | result = 0; |
| 490 | wss->state = WLP_WSS_STATE_ENROLLED; |
| 491 | result = wlp_wss_activate(wss); |
| 492 | if (result < 0) { |
| 493 | dev_err(dev, "WLP: Unable to activate WSS. Undoing " |
| 494 | "enrollment\n"); |
| 495 | wlp_wss_reset(wss); |
| 496 | goto out; |
| 497 | } |
| 498 | result = 0; |
| 499 | out: |
| 500 | mutex_unlock(&wss->mutex); |
| 501 | d_fnend(5, dev, "Completed. result = %d \n", result); |
| 502 | return result; |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * Determine if neighbor has WSS activated |
| 507 | * |
| 508 | * @returns: 1 if neighbor has WSS activated, zero otherwise |
| 509 | * |
| 510 | * This can be done in two ways: |
| 511 | * - send a C1 frame, parse C2/F0 response |
| 512 | * - examine the WLP IE sent by the neighbor |
| 513 | * |
| 514 | * The WLP IE is not fully supported in hardware so we use the C1/C2 frame |
| 515 | * exchange to determine if a WSS is activated. Using the WLP IE should be |
| 516 | * faster and should be used when it becomes possible. |
| 517 | */ |
| 518 | int wlp_wss_is_active(struct wlp *wlp, struct wlp_wss *wss, |
| 519 | struct uwb_dev_addr *dev_addr) |
| 520 | { |
| 521 | int result = 0; |
| 522 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 523 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 524 | DECLARE_COMPLETION_ONSTACK(completion); |
| 525 | struct wlp_session session; |
| 526 | struct sk_buff *skb; |
| 527 | struct wlp_frame_assoc *resp; |
| 528 | struct wlp_uuid wssid; |
| 529 | |
| 530 | wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid); |
| 531 | d_fnstart(5, dev, "wlp %p, wss %p (wssid %s), neighbor %02x:%02x \n", |
| 532 | wlp, wss, buf, dev_addr->data[1], dev_addr->data[0]); |
| 533 | mutex_lock(&wlp->mutex); |
| 534 | /* Send C1 association frame */ |
| 535 | result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C1); |
| 536 | if (result < 0) { |
| 537 | dev_err(dev, "Unable to send C1 frame to neighbor " |
| 538 | "%02x:%02x (%d)\n", dev_addr->data[1], |
| 539 | dev_addr->data[0], result); |
| 540 | result = 0; |
| 541 | goto out; |
| 542 | } |
| 543 | /* Create session, wait for response */ |
| 544 | session.exp_message = WLP_ASSOC_C2; |
| 545 | session.cb = wlp_session_cb; |
| 546 | session.cb_priv = &completion; |
| 547 | session.neighbor_addr = *dev_addr; |
| 548 | BUG_ON(wlp->session != NULL); |
| 549 | wlp->session = &session; |
| 550 | /* Wait for C2/F0 frame */ |
| 551 | result = wait_for_completion_interruptible_timeout(&completion, |
| 552 | WLP_PER_MSG_TIMEOUT * HZ); |
| 553 | if (result == 0) { |
| 554 | dev_err(dev, "Timeout while sending C1 to neighbor " |
| 555 | "%02x:%02x.\n", dev_addr->data[1], |
| 556 | dev_addr->data[0]); |
| 557 | goto out; |
| 558 | } |
| 559 | if (result < 0) { |
| 560 | dev_err(dev, "Unable to send C1 to neighbor %02x:%02x.\n", |
| 561 | dev_addr->data[1], dev_addr->data[0]); |
| 562 | result = 0; |
| 563 | goto out; |
| 564 | } |
| 565 | /* Parse message in session->data: it will be either C2 or F0 */ |
| 566 | skb = session.data; |
| 567 | resp = (void *) skb->data; |
| 568 | d_printf(5, dev, "Received response to C1 frame. \n"); |
| 569 | d_dump(5, dev, skb->data, skb->len > 72 ? 72 : skb->len); |
| 570 | if (resp->type == WLP_ASSOC_F0) { |
| 571 | result = wlp_parse_f0(wlp, skb); |
| 572 | if (result < 0) |
| 573 | dev_err(dev, "WLP: unable to parse incoming F0 " |
| 574 | "frame from neighbor %02x:%02x.\n", |
| 575 | dev_addr->data[1], dev_addr->data[0]); |
| 576 | result = 0; |
| 577 | goto error_resp_parse; |
| 578 | } |
| 579 | /* WLP version and message type fields have already been parsed */ |
| 580 | result = wlp_get_wssid(wlp, (void *)resp + sizeof(*resp), &wssid, |
| 581 | skb->len - sizeof(*resp)); |
| 582 | if (result < 0) { |
| 583 | dev_err(dev, "WLP: unable to obtain WSSID from C2 frame.\n"); |
| 584 | result = 0; |
| 585 | goto error_resp_parse; |
| 586 | } |
| 587 | if (!memcmp(&wssid, &wss->wssid, sizeof(wssid))) { |
| 588 | d_printf(5, dev, "WSSID in C2 frame matches local " |
| 589 | "active WSS.\n"); |
| 590 | result = 1; |
| 591 | } else { |
| 592 | dev_err(dev, "WLP: Received a C2 frame without matching " |
| 593 | "WSSID.\n"); |
| 594 | result = 0; |
| 595 | } |
| 596 | error_resp_parse: |
| 597 | kfree_skb(skb); |
| 598 | out: |
| 599 | wlp->session = NULL; |
| 600 | mutex_unlock(&wlp->mutex); |
| 601 | d_fnend(5, dev, "wlp %p, wss %p (wssid %s), neighbor %02x:%02x \n", |
| 602 | wlp, wss, buf, dev_addr->data[1], dev_addr->data[0]); |
| 603 | return result; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * Activate connection with neighbor by updating EDA cache |
| 608 | * |
| 609 | * @wss: local WSS to which neighbor wants to connect |
| 610 | * @dev_addr: neighbor's address |
| 611 | * @wssid: neighbor's WSSID - must be same as our WSS's WSSID |
| 612 | * @tag: neighbor's WSS tag used to identify frames transmitted by it |
| 613 | * @virt_addr: neighbor's virtual EUI-48 |
| 614 | */ |
| 615 | static |
| 616 | int wlp_wss_activate_connection(struct wlp *wlp, struct wlp_wss *wss, |
| 617 | struct uwb_dev_addr *dev_addr, |
| 618 | struct wlp_uuid *wssid, u8 *tag, |
| 619 | struct uwb_mac_addr *virt_addr) |
| 620 | { |
| 621 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 622 | int result = 0; |
| 623 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 624 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
| 625 | d_fnstart(5, dev, "wlp %p, wss %p, wssid %s, tag %u, virtual " |
| 626 | "%02x:%02x:%02x:%02x:%02x:%02x \n", wlp, wss, buf, *tag, |
| 627 | virt_addr->data[0], virt_addr->data[1], virt_addr->data[2], |
| 628 | virt_addr->data[3], virt_addr->data[4], virt_addr->data[5]); |
| 629 | |
| 630 | if (!memcmp(wssid, &wss->wssid, sizeof(*wssid))) { |
| 631 | d_printf(5, dev, "WSSID from neighbor frame matches local " |
| 632 | "active WSS.\n"); |
| 633 | /* Update EDA cache */ |
| 634 | result = wlp_eda_update_node(&wlp->eda, dev_addr, wss, |
| 635 | (void *) virt_addr->data, *tag, |
| 636 | WLP_WSS_CONNECTED); |
| 637 | if (result < 0) |
| 638 | dev_err(dev, "WLP: Unable to update EDA cache " |
| 639 | "with new connected neighbor information.\n"); |
| 640 | } else { |
| 641 | dev_err(dev, "WLP: Neighbor does not have matching " |
| 642 | "WSSID.\n"); |
| 643 | result = -EINVAL; |
| 644 | } |
| 645 | |
| 646 | d_fnend(5, dev, "wlp %p, wss %p, wssid %s, tag %u, virtual " |
| 647 | "%02x:%02x:%02x:%02x:%02x:%02x, result = %d \n", |
| 648 | wlp, wss, buf, *tag, |
| 649 | virt_addr->data[0], virt_addr->data[1], virt_addr->data[2], |
| 650 | virt_addr->data[3], virt_addr->data[4], virt_addr->data[5], |
| 651 | result); |
| 652 | |
| 653 | return result; |
| 654 | } |
| 655 | |
| 656 | /** |
| 657 | * Connect to WSS neighbor |
| 658 | * |
| 659 | * Use C3/C4 exchange to determine if neighbor has WSS activated and |
| 660 | * retrieve the WSS tag and virtual EUI-48 of the neighbor. |
| 661 | */ |
| 662 | static |
| 663 | int wlp_wss_connect_neighbor(struct wlp *wlp, struct wlp_wss *wss, |
| 664 | struct uwb_dev_addr *dev_addr) |
| 665 | { |
| 666 | int result; |
| 667 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 668 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 669 | struct wlp_uuid wssid; |
| 670 | u8 tag; |
| 671 | struct uwb_mac_addr virt_addr; |
| 672 | DECLARE_COMPLETION_ONSTACK(completion); |
| 673 | struct wlp_session session; |
| 674 | struct wlp_frame_assoc *resp; |
| 675 | struct sk_buff *skb; |
| 676 | |
| 677 | wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid); |
| 678 | d_fnstart(5, dev, "wlp %p, wss %p (wssid %s), neighbor %02x:%02x \n", |
| 679 | wlp, wss, buf, dev_addr->data[1], dev_addr->data[0]); |
| 680 | mutex_lock(&wlp->mutex); |
| 681 | /* Send C3 association frame */ |
| 682 | result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C3); |
| 683 | if (result < 0) { |
| 684 | dev_err(dev, "Unable to send C3 frame to neighbor " |
| 685 | "%02x:%02x (%d)\n", dev_addr->data[1], |
| 686 | dev_addr->data[0], result); |
| 687 | goto out; |
| 688 | } |
| 689 | /* Create session, wait for response */ |
| 690 | session.exp_message = WLP_ASSOC_C4; |
| 691 | session.cb = wlp_session_cb; |
| 692 | session.cb_priv = &completion; |
| 693 | session.neighbor_addr = *dev_addr; |
| 694 | BUG_ON(wlp->session != NULL); |
| 695 | wlp->session = &session; |
| 696 | /* Wait for C4/F0 frame */ |
| 697 | result = wait_for_completion_interruptible_timeout(&completion, |
| 698 | WLP_PER_MSG_TIMEOUT * HZ); |
| 699 | if (result == 0) { |
| 700 | dev_err(dev, "Timeout while sending C3 to neighbor " |
| 701 | "%02x:%02x.\n", dev_addr->data[1], |
| 702 | dev_addr->data[0]); |
| 703 | result = -ETIMEDOUT; |
| 704 | goto out; |
| 705 | } |
| 706 | if (result < 0) { |
| 707 | dev_err(dev, "Unable to send C3 to neighbor %02x:%02x.\n", |
| 708 | dev_addr->data[1], dev_addr->data[0]); |
| 709 | goto out; |
| 710 | } |
| 711 | /* Parse message in session->data: it will be either C4 or F0 */ |
| 712 | skb = session.data; |
| 713 | resp = (void *) skb->data; |
| 714 | d_printf(5, dev, "Received response to C3 frame. \n"); |
| 715 | d_dump(5, dev, skb->data, skb->len > 72 ? 72 : skb->len); |
| 716 | if (resp->type == WLP_ASSOC_F0) { |
| 717 | result = wlp_parse_f0(wlp, skb); |
| 718 | if (result < 0) |
| 719 | dev_err(dev, "WLP: unable to parse incoming F0 " |
| 720 | "frame from neighbor %02x:%02x.\n", |
| 721 | dev_addr->data[1], dev_addr->data[0]); |
| 722 | result = -EINVAL; |
| 723 | goto error_resp_parse; |
| 724 | } |
| 725 | result = wlp_parse_c3c4_frame(wlp, skb, &wssid, &tag, &virt_addr); |
| 726 | if (result < 0) { |
| 727 | dev_err(dev, "WLP: Unable to parse C4 frame from neighbor.\n"); |
| 728 | goto error_resp_parse; |
| 729 | } |
| 730 | result = wlp_wss_activate_connection(wlp, wss, dev_addr, &wssid, &tag, |
| 731 | &virt_addr); |
| 732 | if (result < 0) { |
| 733 | dev_err(dev, "WLP: Unable to activate connection to " |
| 734 | "neighbor %02x:%02x.\n", dev_addr->data[1], |
| 735 | dev_addr->data[0]); |
| 736 | goto error_resp_parse; |
| 737 | } |
| 738 | error_resp_parse: |
| 739 | kfree_skb(skb); |
| 740 | out: |
| 741 | /* Record that we unsuccessfully tried to connect to this neighbor */ |
| 742 | if (result < 0) |
| 743 | wlp_eda_update_node_state(&wlp->eda, dev_addr, |
| 744 | WLP_WSS_CONNECT_FAILED); |
| 745 | wlp->session = NULL; |
| 746 | mutex_unlock(&wlp->mutex); |
| 747 | d_fnend(5, dev, "wlp %p, wss %p (wssid %s), neighbor %02x:%02x \n", |
| 748 | wlp, wss, buf, dev_addr->data[1], dev_addr->data[0]); |
| 749 | return result; |
| 750 | } |
| 751 | |
| 752 | /** |
| 753 | * Connect to neighbor with common WSS, send pending frame |
| 754 | * |
| 755 | * This function is scheduled when a frame is destined to a neighbor with |
| 756 | * which we do not have a connection. A copy of the EDA cache entry is |
| 757 | * provided - not the actual cache entry (because it is protected by a |
| 758 | * spinlock). |
| 759 | * |
| 760 | * First determine if neighbor has the same WSS activated, connect if it |
| 761 | * does. The C3/C4 exchange is dual purpose to determine if neighbor has |
| 762 | * WSS activated and proceed with the connection. |
| 763 | * |
| 764 | * The frame that triggered the connection setup is sent after connection |
| 765 | * setup. |
| 766 | * |
| 767 | * network queue is stopped - we need to restart when done |
| 768 | * |
| 769 | */ |
| 770 | static |
| 771 | void wlp_wss_connect_send(struct work_struct *ws) |
| 772 | { |
| 773 | struct wlp_assoc_conn_ctx *conn_ctx = container_of(ws, |
| 774 | struct wlp_assoc_conn_ctx, |
| 775 | ws); |
| 776 | struct wlp *wlp = conn_ctx->wlp; |
| 777 | struct sk_buff *skb = conn_ctx->skb; |
| 778 | struct wlp_eda_node *eda_entry = &conn_ctx->eda_entry; |
| 779 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 780 | struct wlp_wss *wss = &wlp->wss; |
| 781 | int result; |
| 782 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 783 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 784 | |
| 785 | mutex_lock(&wss->mutex); |
| 786 | wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid); |
| 787 | d_fnstart(5, dev, "wlp %p, wss %p (wssid %s), neighbor %02x:%02x \n", |
| 788 | wlp, wss, buf, dev_addr->data[1], dev_addr->data[0]); |
| 789 | if (wss->state < WLP_WSS_STATE_ACTIVE) { |
| 790 | if (printk_ratelimit()) |
| 791 | dev_err(dev, "WLP: Attempting to connect with " |
| 792 | "WSS that is not active or connected.\n"); |
| 793 | dev_kfree_skb(skb); |
| 794 | goto out; |
| 795 | } |
| 796 | /* Establish connection - send C3 rcv C4 */ |
| 797 | result = wlp_wss_connect_neighbor(wlp, wss, dev_addr); |
| 798 | if (result < 0) { |
| 799 | if (printk_ratelimit()) |
| 800 | dev_err(dev, "WLP: Unable to establish connection " |
| 801 | "with neighbor %02x:%02x.\n", |
| 802 | dev_addr->data[1], dev_addr->data[0]); |
| 803 | dev_kfree_skb(skb); |
| 804 | goto out; |
| 805 | } |
| 806 | /* EDA entry changed, update the local copy being used */ |
| 807 | result = wlp_copy_eda_node(&wlp->eda, dev_addr, eda_entry); |
| 808 | if (result < 0) { |
| 809 | if (printk_ratelimit()) |
| 810 | dev_err(dev, "WLP: Cannot find EDA entry for " |
| 811 | "neighbor %02x:%02x \n", |
| 812 | dev_addr->data[1], dev_addr->data[0]); |
| 813 | } |
| 814 | result = wlp_wss_prep_hdr(wlp, eda_entry, skb); |
| 815 | if (result < 0) { |
| 816 | if (printk_ratelimit()) |
| 817 | dev_err(dev, "WLP: Unable to prepare frame header for " |
| 818 | "transmission (neighbor %02x:%02x). \n", |
| 819 | dev_addr->data[1], dev_addr->data[0]); |
| 820 | dev_kfree_skb(skb); |
| 821 | goto out; |
| 822 | } |
| 823 | BUG_ON(wlp->xmit_frame == NULL); |
| 824 | result = wlp->xmit_frame(wlp, skb, dev_addr); |
| 825 | if (result < 0) { |
| 826 | if (printk_ratelimit()) |
| 827 | dev_err(dev, "WLP: Unable to transmit frame: %d\n", |
| 828 | result); |
| 829 | if (result == -ENXIO) |
| 830 | dev_err(dev, "WLP: Is network interface up? \n"); |
| 831 | /* We could try again ... */ |
| 832 | dev_kfree_skb(skb);/*we need to free if tx fails */ |
| 833 | } |
| 834 | out: |
| 835 | kfree(conn_ctx); |
| 836 | BUG_ON(wlp->start_queue == NULL); |
| 837 | wlp->start_queue(wlp); |
| 838 | mutex_unlock(&wss->mutex); |
| 839 | d_fnend(5, dev, "wlp %p, wss %p (wssid %s)\n", wlp, wss, buf); |
| 840 | } |
| 841 | |
| 842 | /** |
| 843 | * Add WLP header to outgoing skb |
| 844 | * |
| 845 | * @eda_entry: pointer to neighbor's entry in the EDA cache |
| 846 | * @_skb: skb containing data destined to the neighbor |
| 847 | */ |
| 848 | int wlp_wss_prep_hdr(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 849 | void *_skb) |
| 850 | { |
| 851 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 852 | int result = 0; |
| 853 | unsigned char *eth_addr = eda_entry->eth_addr; |
| 854 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 855 | struct sk_buff *skb = _skb; |
| 856 | struct wlp_frame_std_abbrv_hdr *std_hdr; |
| 857 | |
| 858 | d_fnstart(6, dev, "wlp %p \n", wlp); |
| 859 | if (eda_entry->state == WLP_WSS_CONNECTED) { |
| 860 | /* Add WLP header */ |
| 861 | BUG_ON(skb_headroom(skb) < sizeof(*std_hdr)); |
| 862 | std_hdr = (void *) __skb_push(skb, sizeof(*std_hdr)); |
| 863 | std_hdr->hdr.mux_hdr = cpu_to_le16(WLP_PROTOCOL_ID); |
| 864 | std_hdr->hdr.type = WLP_FRAME_STANDARD; |
| 865 | std_hdr->tag = eda_entry->wss->tag; |
| 866 | } else { |
| 867 | if (printk_ratelimit()) |
| 868 | dev_err(dev, "WLP: Destination neighbor (Ethernet: " |
| 869 | "%02x:%02x:%02x:%02x:%02x:%02x, Dev: " |
| 870 | "%02x:%02x) is not connected. \n", eth_addr[0], |
| 871 | eth_addr[1], eth_addr[2], eth_addr[3], |
| 872 | eth_addr[4], eth_addr[5], dev_addr->data[1], |
| 873 | dev_addr->data[0]); |
| 874 | result = -EINVAL; |
| 875 | } |
| 876 | d_fnend(6, dev, "wlp %p \n", wlp); |
| 877 | return result; |
| 878 | } |
| 879 | |
| 880 | |
| 881 | /** |
| 882 | * Prepare skb for neighbor: connect if not already and prep WLP header |
| 883 | * |
| 884 | * This function is called in interrupt context, but it needs to sleep. We |
| 885 | * temporarily stop the net queue to establish the WLP connection. |
| 886 | * Setup of the WLP connection and restart of queue is scheduled |
| 887 | * on the default work queue. |
| 888 | * |
| 889 | * run with eda->lock held (spinlock) |
| 890 | */ |
| 891 | int wlp_wss_connect_prep(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 892 | void *_skb) |
| 893 | { |
| 894 | int result = 0; |
| 895 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 896 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 897 | unsigned char *eth_addr = eda_entry->eth_addr; |
| 898 | struct sk_buff *skb = _skb; |
| 899 | struct wlp_assoc_conn_ctx *conn_ctx; |
| 900 | |
| 901 | d_fnstart(5, dev, "wlp %p\n", wlp); |
| 902 | d_printf(5, dev, "To neighbor %02x:%02x with eth " |
| 903 | "%02x:%02x:%02x:%02x:%02x:%02x\n", dev_addr->data[1], |
| 904 | dev_addr->data[0], eth_addr[0], eth_addr[1], eth_addr[2], |
| 905 | eth_addr[3], eth_addr[4], eth_addr[5]); |
| 906 | if (eda_entry->state == WLP_WSS_UNCONNECTED) { |
| 907 | /* We don't want any more packets while we set up connection */ |
| 908 | BUG_ON(wlp->stop_queue == NULL); |
| 909 | wlp->stop_queue(wlp); |
| 910 | conn_ctx = kmalloc(sizeof(*conn_ctx), GFP_ATOMIC); |
| 911 | if (conn_ctx == NULL) { |
| 912 | if (printk_ratelimit()) |
| 913 | dev_err(dev, "WLP: Unable to allocate memory " |
| 914 | "for connection handling.\n"); |
| 915 | result = -ENOMEM; |
| 916 | goto out; |
| 917 | } |
| 918 | conn_ctx->wlp = wlp; |
| 919 | conn_ctx->skb = skb; |
| 920 | conn_ctx->eda_entry = *eda_entry; |
| 921 | INIT_WORK(&conn_ctx->ws, wlp_wss_connect_send); |
| 922 | schedule_work(&conn_ctx->ws); |
| 923 | result = 1; |
| 924 | } else if (eda_entry->state == WLP_WSS_CONNECT_FAILED) { |
| 925 | /* Previous connection attempts failed, don't retry - see |
| 926 | * conditions for connection in WLP 0.99 [7.6.2] */ |
| 927 | if (printk_ratelimit()) |
| 928 | dev_err(dev, "Could not connect to neighbor " |
| 929 | "previously. Not retrying. \n"); |
| 930 | result = -ENONET; |
| 931 | goto out; |
| 932 | } else { /* eda_entry->state == WLP_WSS_CONNECTED */ |
| 933 | d_printf(5, dev, "Neighbor is connected, preparing frame.\n"); |
| 934 | result = wlp_wss_prep_hdr(wlp, eda_entry, skb); |
| 935 | } |
| 936 | out: |
| 937 | d_fnend(5, dev, "wlp %p, result = %d \n", wlp, result); |
| 938 | return result; |
| 939 | } |
| 940 | |
| 941 | /** |
| 942 | * Emulate broadcast: copy skb, send copy to neighbor (connect if not already) |
| 943 | * |
| 944 | * We need to copy skbs in the case where we emulate broadcast through |
| 945 | * unicast. We copy instead of clone because we are modifying the data of |
| 946 | * the frame after copying ... clones share data so we cannot emulate |
| 947 | * broadcast using clones. |
| 948 | * |
| 949 | * run with eda->lock held (spinlock) |
| 950 | */ |
| 951 | int wlp_wss_send_copy(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 952 | void *_skb) |
| 953 | { |
| 954 | int result = -ENOMEM; |
| 955 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 956 | struct sk_buff *skb = _skb; |
| 957 | struct sk_buff *copy; |
| 958 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 959 | |
| 960 | d_fnstart(5, dev, "to neighbor %02x:%02x, skb (%p) \n", |
| 961 | dev_addr->data[1], dev_addr->data[0], skb); |
| 962 | copy = skb_copy(skb, GFP_ATOMIC); |
| 963 | if (copy == NULL) { |
| 964 | if (printk_ratelimit()) |
| 965 | dev_err(dev, "WLP: Unable to copy skb for " |
| 966 | "transmission.\n"); |
| 967 | goto out; |
| 968 | } |
| 969 | result = wlp_wss_connect_prep(wlp, eda_entry, copy); |
| 970 | if (result < 0) { |
| 971 | if (printk_ratelimit()) |
| 972 | dev_err(dev, "WLP: Unable to connect/send skb " |
| 973 | "to neighbor.\n"); |
| 974 | dev_kfree_skb_irq(copy); |
| 975 | goto out; |
| 976 | } else if (result == 1) |
| 977 | /* Frame will be transmitted separately */ |
| 978 | goto out; |
| 979 | BUG_ON(wlp->xmit_frame == NULL); |
| 980 | result = wlp->xmit_frame(wlp, copy, dev_addr); |
| 981 | if (result < 0) { |
| 982 | if (printk_ratelimit()) |
| 983 | dev_err(dev, "WLP: Unable to transmit frame: %d\n", |
| 984 | result); |
| 985 | if ((result == -ENXIO) && printk_ratelimit()) |
| 986 | dev_err(dev, "WLP: Is network interface up? \n"); |
| 987 | /* We could try again ... */ |
| 988 | dev_kfree_skb_irq(copy);/*we need to free if tx fails */ |
| 989 | } |
| 990 | out: |
| 991 | d_fnend(5, dev, "to neighbor %02x:%02x \n", dev_addr->data[1], |
| 992 | dev_addr->data[0]); |
| 993 | return result; |
| 994 | } |
| 995 | |
| 996 | |
| 997 | /** |
| 998 | * Setup WSS |
| 999 | * |
| 1000 | * Should be called by network driver after the interface has been given a |
| 1001 | * MAC address. |
| 1002 | */ |
| 1003 | int wlp_wss_setup(struct net_device *net_dev, struct wlp_wss *wss) |
| 1004 | { |
| 1005 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 1006 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 1007 | int result = 0; |
| 1008 | d_fnstart(5, dev, "wss (%p) \n", wss); |
| 1009 | mutex_lock(&wss->mutex); |
| 1010 | wss->kobj.parent = &net_dev->dev.kobj; |
| 1011 | if (!is_valid_ether_addr(net_dev->dev_addr)) { |
| 1012 | dev_err(dev, "WLP: Invalid MAC address. Cannot use for" |
| 1013 | "virtual.\n"); |
| 1014 | result = -EINVAL; |
| 1015 | goto out; |
| 1016 | } |
| 1017 | memcpy(wss->virtual_addr.data, net_dev->dev_addr, |
| 1018 | sizeof(wss->virtual_addr.data)); |
| 1019 | out: |
| 1020 | mutex_unlock(&wss->mutex); |
| 1021 | d_fnend(5, dev, "wss (%p) \n", wss); |
| 1022 | return result; |
| 1023 | } |
| 1024 | EXPORT_SYMBOL_GPL(wlp_wss_setup); |
| 1025 | |
| 1026 | /** |
| 1027 | * Remove WSS |
| 1028 | * |
| 1029 | * Called by client that configured WSS through wlp_wss_setup(). This |
| 1030 | * function is called when client no longer needs WSS, eg. client shuts |
| 1031 | * down. |
| 1032 | * |
| 1033 | * We remove the WLP IE from the beacon before initiating local cleanup. |
| 1034 | */ |
| 1035 | void wlp_wss_remove(struct wlp_wss *wss) |
| 1036 | { |
| 1037 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 1038 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 1039 | d_fnstart(5, dev, "wss (%p) \n", wss); |
| 1040 | mutex_lock(&wss->mutex); |
| 1041 | if (wss->state == WLP_WSS_STATE_ACTIVE) |
| 1042 | uwb_rc_ie_rm(wlp->rc, UWB_IE_WLP); |
| 1043 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 1044 | sysfs_remove_group(&wss->kobj, &wss_attr_group); |
| 1045 | kobject_put(&wss->kobj); |
| 1046 | } |
| 1047 | wss->kobj.parent = NULL; |
| 1048 | memset(&wss->virtual_addr, 0, sizeof(wss->virtual_addr)); |
| 1049 | /* Cleanup EDA cache */ |
| 1050 | wlp_eda_release(&wlp->eda); |
| 1051 | wlp_eda_init(&wlp->eda); |
| 1052 | mutex_unlock(&wss->mutex); |
| 1053 | d_fnend(5, dev, "wss (%p) \n", wss); |
| 1054 | } |
| 1055 | EXPORT_SYMBOL_GPL(wlp_wss_remove); |