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 | */ |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 46 | #include <linux/etherdevice.h> /* for is_valid_ether_addr */ |
| 47 | #include <linux/skbuff.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 48 | #include <linux/slab.h> |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 49 | #include <linux/wlp.h> |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 50 | |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 51 | #include "wlp-internal.h" |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 52 | |
| 53 | size_t wlp_wss_key_print(char *buf, size_t bufsize, u8 *key) |
| 54 | { |
| 55 | size_t result; |
| 56 | |
| 57 | result = scnprintf(buf, bufsize, |
| 58 | "%02x %02x %02x %02x %02x %02x " |
| 59 | "%02x %02x %02x %02x %02x %02x " |
| 60 | "%02x %02x %02x %02x", |
| 61 | key[0], key[1], key[2], key[3], |
| 62 | key[4], key[5], key[6], key[7], |
| 63 | key[8], key[9], key[10], key[11], |
| 64 | key[12], key[13], key[14], key[15]); |
| 65 | return result; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Compute WSSID hash |
| 70 | * WLP Draft 0.99 [7.2.1] |
| 71 | * |
| 72 | * The WSSID hash for a WSSID is the result of an octet-wise exclusive-OR |
| 73 | * of all octets in the WSSID. |
| 74 | */ |
| 75 | static |
| 76 | u8 wlp_wss_comp_wssid_hash(struct wlp_uuid *wssid) |
| 77 | { |
| 78 | return wssid->data[0] ^ wssid->data[1] ^ wssid->data[2] |
| 79 | ^ wssid->data[3] ^ wssid->data[4] ^ wssid->data[5] |
| 80 | ^ wssid->data[6] ^ wssid->data[7] ^ wssid->data[8] |
| 81 | ^ wssid->data[9] ^ wssid->data[10] ^ wssid->data[11] |
| 82 | ^ wssid->data[12] ^ wssid->data[13] ^ wssid->data[14] |
| 83 | ^ wssid->data[15]; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Select a multicast EUI-48 for the WSS broadcast address. |
| 88 | * WLP Draft 0.99 [7.2.1] |
| 89 | * |
| 90 | * Selected based on the WiMedia Alliance OUI, 00-13-88, within the WLP |
| 91 | * range, [01-13-88-00-01-00, 01-13-88-00-01-FF] inclusive. |
| 92 | * |
| 93 | * This address is currently hardcoded. |
| 94 | * FIXME? |
| 95 | */ |
| 96 | static |
| 97 | struct uwb_mac_addr wlp_wss_sel_bcast_addr(struct wlp_wss *wss) |
| 98 | { |
| 99 | struct uwb_mac_addr bcast = { |
| 100 | .data = { 0x01, 0x13, 0x88, 0x00, 0x01, 0x00 } |
| 101 | }; |
| 102 | return bcast; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Clear the contents of the WSS structure - all except kobj, mutex, virtual |
| 107 | * |
| 108 | * We do not want to reinitialize - the internal kobj should not change as |
| 109 | * it still points to the parent received during setup. The mutex should |
| 110 | * remain also. We thus just reset values individually. |
| 111 | * The virutal address assigned to WSS will remain the same for the |
| 112 | * lifetime of the WSS. We only reset the fields that can change during its |
| 113 | * lifetime. |
| 114 | */ |
| 115 | void wlp_wss_reset(struct wlp_wss *wss) |
| 116 | { |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 117 | memset(&wss->wssid, 0, sizeof(wss->wssid)); |
| 118 | wss->hash = 0; |
| 119 | memset(&wss->name[0], 0, sizeof(wss->name)); |
| 120 | memset(&wss->bcast, 0, sizeof(wss->bcast)); |
| 121 | wss->secure_status = WLP_WSS_UNSECURE; |
| 122 | memset(&wss->master_key[0], 0, sizeof(wss->master_key)); |
| 123 | wss->tag = 0; |
| 124 | wss->state = WLP_WSS_STATE_NONE; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Create sysfs infrastructure for WSS |
| 129 | * |
| 130 | * The WSS is configured to have the interface as parent (see wlp_wss_setup()) |
| 131 | * a new sysfs directory that includes wssid as its name is created in the |
| 132 | * interface's sysfs directory. The group of files interacting with WSS are |
| 133 | * created also. |
| 134 | */ |
| 135 | static |
| 136 | int wlp_wss_sysfs_add(struct wlp_wss *wss, char *wssid_str) |
| 137 | { |
| 138 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 139 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 140 | int result; |
| 141 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 142 | result = kobject_set_name(&wss->kobj, "wss-%s", wssid_str); |
| 143 | if (result < 0) |
| 144 | return result; |
| 145 | wss->kobj.ktype = &wss_ktype; |
| 146 | result = kobject_init_and_add(&wss->kobj, |
| 147 | &wss_ktype, wss->kobj.parent, "wlp"); |
| 148 | if (result < 0) { |
| 149 | dev_err(dev, "WLP: Cannot register WSS kobject.\n"); |
| 150 | goto error_kobject_register; |
| 151 | } |
| 152 | result = sysfs_create_group(&wss->kobj, &wss_attr_group); |
| 153 | if (result < 0) { |
| 154 | dev_err(dev, "WLP: Cannot register WSS attributes: %d\n", |
| 155 | result); |
| 156 | goto error_sysfs_create_group; |
| 157 | } |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 158 | return 0; |
| 159 | error_sysfs_create_group: |
| 160 | |
| 161 | kobject_put(&wss->kobj); /* will free name if needed */ |
| 162 | return result; |
| 163 | error_kobject_register: |
| 164 | kfree(wss->kobj.name); |
| 165 | wss->kobj.name = NULL; |
| 166 | wss->kobj.ktype = NULL; |
| 167 | return result; |
| 168 | } |
| 169 | |
| 170 | |
| 171 | /** |
| 172 | * Release WSS |
| 173 | * |
| 174 | * No more references exist to this WSS. We should undo everything that was |
| 175 | * done in wlp_wss_create_activate() except removing the group. The group |
| 176 | * is not removed because an object can be unregistered before the group is |
| 177 | * created. We also undo any additional operations on the WSS after this |
| 178 | * (addition of members). |
| 179 | * |
| 180 | * If memory was allocated for the kobject's name then it will |
| 181 | * be freed by the kobject system during this time. |
| 182 | * |
| 183 | * The EDA cache is removed and reinitilized when the WSS is removed. We |
| 184 | * thus loose knowledge of members of this WSS at that time and need not do |
| 185 | * it here. |
| 186 | */ |
| 187 | void wlp_wss_release(struct kobject *kobj) |
| 188 | { |
| 189 | struct wlp_wss *wss = container_of(kobj, struct wlp_wss, kobj); |
| 190 | |
| 191 | wlp_wss_reset(wss); |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Enroll into a WSS using provided neighbor as registrar |
| 196 | * |
| 197 | * First search the neighborhood information to learn which neighbor is |
| 198 | * referred to, next proceed with enrollment. |
| 199 | * |
| 200 | * &wss->mutex is held |
| 201 | */ |
| 202 | static |
| 203 | int wlp_wss_enroll_target(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 204 | struct uwb_dev_addr *dest) |
| 205 | { |
| 206 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 207 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 208 | struct wlp_neighbor_e *neighbor; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 209 | int result = -ENXIO; |
| 210 | struct uwb_dev_addr *dev_addr; |
| 211 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 212 | mutex_lock(&wlp->nbmutex); |
| 213 | list_for_each_entry(neighbor, &wlp->neighbors, node) { |
| 214 | dev_addr = &neighbor->uwb_dev->dev_addr; |
| 215 | if (!memcmp(dest, dev_addr, sizeof(*dest))) { |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 216 | result = wlp_enroll_neighbor(wlp, neighbor, wss, wssid); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 217 | break; |
| 218 | } |
| 219 | } |
| 220 | if (result == -ENXIO) |
| 221 | dev_err(dev, "WLP: Cannot find neighbor %02x:%02x. \n", |
| 222 | dest->data[1], dest->data[0]); |
| 223 | mutex_unlock(&wlp->nbmutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 224 | return result; |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Enroll into a WSS previously discovered |
| 229 | * |
| 230 | * User provides WSSID of WSS, search for neighbor that has this WSS |
| 231 | * activated and attempt to enroll. |
| 232 | * |
| 233 | * &wss->mutex is held |
| 234 | */ |
| 235 | static |
| 236 | int wlp_wss_enroll_discovered(struct wlp_wss *wss, struct wlp_uuid *wssid) |
| 237 | { |
| 238 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 239 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 240 | struct wlp_neighbor_e *neighbor; |
| 241 | struct wlp_wssid_e *wssid_e; |
| 242 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 243 | int result = -ENXIO; |
| 244 | |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 245 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 246 | mutex_lock(&wlp->nbmutex); |
| 247 | list_for_each_entry(neighbor, &wlp->neighbors, node) { |
| 248 | list_for_each_entry(wssid_e, &neighbor->wssid, node) { |
| 249 | if (!memcmp(wssid, &wssid_e->wssid, sizeof(*wssid))) { |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 250 | result = wlp_enroll_neighbor(wlp, neighbor, |
| 251 | wss, wssid); |
| 252 | if (result == 0) /* enrollment success */ |
| 253 | goto out; |
| 254 | break; |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | out: |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 259 | if (result == -ENXIO) { |
| 260 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 261 | dev_err(dev, "WLP: Cannot find WSSID %s in cache. \n", buf); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 262 | } |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 263 | mutex_unlock(&wlp->nbmutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 264 | return result; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Enroll into WSS with provided WSSID, registrar may be provided |
| 269 | * |
| 270 | * @wss: out WSS that will be enrolled |
| 271 | * @wssid: wssid of neighboring WSS that we want to enroll in |
| 272 | * @devaddr: registrar can be specified, will be broadcast (ff:ff) if any |
| 273 | * neighbor can be used as registrar. |
| 274 | * |
| 275 | * &wss->mutex is held |
| 276 | */ |
| 277 | static |
| 278 | int wlp_wss_enroll(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 279 | struct uwb_dev_addr *devaddr) |
| 280 | { |
| 281 | int result; |
| 282 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 283 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 284 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 285 | struct uwb_dev_addr bcast = {.data = {0xff, 0xff} }; |
| 286 | |
| 287 | wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 288 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 289 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 290 | dev_err(dev, "WLP: Already enrolled in WSS %s.\n", buf); |
| 291 | result = -EEXIST; |
| 292 | goto error; |
| 293 | } |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 294 | if (!memcmp(&bcast, devaddr, sizeof(bcast))) |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 295 | result = wlp_wss_enroll_discovered(wss, wssid); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 296 | else |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 297 | result = wlp_wss_enroll_target(wss, wssid, devaddr); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 298 | if (result < 0) { |
| 299 | dev_err(dev, "WLP: Unable to enroll into WSS %s, result %d \n", |
| 300 | buf, result); |
| 301 | goto error; |
| 302 | } |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 303 | dev_dbg(dev, "Successfully enrolled into WSS %s \n", buf); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 304 | result = wlp_wss_sysfs_add(wss, buf); |
| 305 | if (result < 0) { |
| 306 | dev_err(dev, "WLP: Unable to set up sysfs for WSS kobject.\n"); |
| 307 | wlp_wss_reset(wss); |
| 308 | } |
| 309 | error: |
| 310 | return result; |
| 311 | |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * Activate given WSS |
| 316 | * |
| 317 | * Prior to activation a WSS must be enrolled. To activate a WSS a device |
| 318 | * includes the WSS hash in the WLP IE in its beacon in each superframe. |
| 319 | * WLP 0.99 [7.2.5]. |
| 320 | * |
| 321 | * The WSS tag is also computed at this time. We only support one activated |
| 322 | * WSS so we can use the hash as a tag - there will never be a conflict. |
| 323 | * |
| 324 | * We currently only support one activated WSS so only one WSS hash is |
| 325 | * included in the WLP IE. |
| 326 | */ |
| 327 | static |
| 328 | int wlp_wss_activate(struct wlp_wss *wss) |
| 329 | { |
| 330 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 331 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 332 | struct uwb_rc *uwb_rc = wlp->rc; |
| 333 | int result; |
| 334 | struct { |
| 335 | struct wlp_ie wlp_ie; |
| 336 | u8 hash; /* only include one hash */ |
| 337 | } ie_data; |
| 338 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 339 | BUG_ON(wss->state != WLP_WSS_STATE_ENROLLED); |
| 340 | wss->hash = wlp_wss_comp_wssid_hash(&wss->wssid); |
| 341 | wss->tag = wss->hash; |
| 342 | memset(&ie_data, 0, sizeof(ie_data)); |
| 343 | ie_data.wlp_ie.hdr.element_id = UWB_IE_WLP; |
| 344 | ie_data.wlp_ie.hdr.length = sizeof(ie_data) - sizeof(struct uwb_ie_hdr); |
| 345 | wlp_ie_set_hash_length(&ie_data.wlp_ie, sizeof(ie_data.hash)); |
| 346 | ie_data.hash = wss->hash; |
| 347 | result = uwb_rc_ie_add(uwb_rc, &ie_data.wlp_ie.hdr, |
| 348 | sizeof(ie_data)); |
| 349 | if (result < 0) { |
| 350 | dev_err(dev, "WLP: Unable to add WLP IE to beacon. " |
| 351 | "result = %d.\n", result); |
| 352 | goto error_wlp_ie; |
| 353 | } |
| 354 | wss->state = WLP_WSS_STATE_ACTIVE; |
| 355 | result = 0; |
| 356 | error_wlp_ie: |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 357 | return result; |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * Enroll in and activate WSS identified by provided WSSID |
| 362 | * |
| 363 | * The neighborhood cache should contain a list of all neighbors and the |
| 364 | * WSS they have activated. Based on that cache we search which neighbor we |
| 365 | * can perform the association process with. The user also has option to |
| 366 | * specify which neighbor it prefers as registrar. |
| 367 | * Successful enrollment is followed by activation. |
| 368 | * Successful activation will create the sysfs directory containing |
| 369 | * specific information regarding this WSS. |
| 370 | */ |
| 371 | int wlp_wss_enroll_activate(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 372 | struct uwb_dev_addr *devaddr) |
| 373 | { |
| 374 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 375 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 376 | int result = 0; |
| 377 | char buf[WLP_WSS_UUID_STRSIZE]; |
| 378 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 379 | mutex_lock(&wss->mutex); |
| 380 | result = wlp_wss_enroll(wss, wssid, devaddr); |
| 381 | if (result < 0) { |
| 382 | wlp_wss_uuid_print(buf, sizeof(buf), &wss->wssid); |
| 383 | dev_err(dev, "WLP: Enrollment into WSS %s failed.\n", buf); |
| 384 | goto error_enroll; |
| 385 | } |
| 386 | result = wlp_wss_activate(wss); |
| 387 | if (result < 0) { |
| 388 | dev_err(dev, "WLP: Unable to activate WSS. Undoing enrollment " |
| 389 | "result = %d \n", result); |
| 390 | /* Undo enrollment */ |
| 391 | wlp_wss_reset(wss); |
| 392 | goto error_activate; |
| 393 | } |
| 394 | error_activate: |
| 395 | error_enroll: |
| 396 | mutex_unlock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 397 | return result; |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Create, enroll, and activate a new WSS |
| 402 | * |
| 403 | * @wssid: new wssid provided by user |
| 404 | * @name: WSS name requested by used. |
| 405 | * @sec_status: security status requested by user |
| 406 | * |
| 407 | * A user requested the creation of a new WSS. All operations are done |
| 408 | * locally. The new WSS will be stored locally, the hash will be included |
| 409 | * in the WLP IE, and the sysfs infrastructure for this WSS will be |
| 410 | * created. |
| 411 | */ |
| 412 | int wlp_wss_create_activate(struct wlp_wss *wss, struct wlp_uuid *wssid, |
| 413 | char *name, unsigned sec_status, unsigned accept) |
| 414 | { |
| 415 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 416 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 417 | int result = 0; |
| 418 | char buf[WLP_WSS_UUID_STRSIZE]; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 419 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 420 | result = wlp_wss_uuid_print(buf, sizeof(buf), wssid); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 421 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 422 | if (!mutex_trylock(&wss->mutex)) { |
| 423 | dev_err(dev, "WLP: WLP association session in progress.\n"); |
| 424 | return -EBUSY; |
| 425 | } |
| 426 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 427 | dev_err(dev, "WLP: WSS already exists. Not creating new.\n"); |
| 428 | result = -EEXIST; |
| 429 | goto out; |
| 430 | } |
| 431 | if (wss->kobj.parent == NULL) { |
| 432 | dev_err(dev, "WLP: WSS parent not ready. Is network interface " |
| 433 | "up?\n"); |
| 434 | result = -ENXIO; |
| 435 | goto out; |
| 436 | } |
| 437 | if (sec_status == WLP_WSS_SECURE) { |
| 438 | dev_err(dev, "WLP: FIXME Creation of secure WSS not " |
| 439 | "supported yet.\n"); |
| 440 | result = -EINVAL; |
| 441 | goto out; |
| 442 | } |
| 443 | wss->wssid = *wssid; |
| 444 | memcpy(wss->name, name, sizeof(wss->name)); |
| 445 | wss->bcast = wlp_wss_sel_bcast_addr(wss); |
| 446 | wss->secure_status = sec_status; |
| 447 | wss->accept_enroll = accept; |
| 448 | /*wss->virtual_addr is initialized in call to wlp_wss_setup*/ |
| 449 | /* sysfs infrastructure */ |
| 450 | result = wlp_wss_sysfs_add(wss, buf); |
| 451 | if (result < 0) { |
| 452 | dev_err(dev, "Cannot set up sysfs for WSS kobject.\n"); |
| 453 | wlp_wss_reset(wss); |
| 454 | goto out; |
| 455 | } else |
| 456 | result = 0; |
| 457 | wss->state = WLP_WSS_STATE_ENROLLED; |
| 458 | result = wlp_wss_activate(wss); |
| 459 | if (result < 0) { |
| 460 | dev_err(dev, "WLP: Unable to activate WSS. Undoing " |
| 461 | "enrollment\n"); |
| 462 | wlp_wss_reset(wss); |
| 463 | goto out; |
| 464 | } |
| 465 | result = 0; |
| 466 | out: |
| 467 | mutex_unlock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 468 | return result; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * Determine if neighbor has WSS activated |
| 473 | * |
| 474 | * @returns: 1 if neighbor has WSS activated, zero otherwise |
| 475 | * |
| 476 | * This can be done in two ways: |
| 477 | * - send a C1 frame, parse C2/F0 response |
| 478 | * - examine the WLP IE sent by the neighbor |
| 479 | * |
| 480 | * The WLP IE is not fully supported in hardware so we use the C1/C2 frame |
| 481 | * exchange to determine if a WSS is activated. Using the WLP IE should be |
| 482 | * faster and should be used when it becomes possible. |
| 483 | */ |
| 484 | int wlp_wss_is_active(struct wlp *wlp, struct wlp_wss *wss, |
| 485 | struct uwb_dev_addr *dev_addr) |
| 486 | { |
| 487 | int result = 0; |
| 488 | struct device *dev = &wlp->rc->uwb_dev.dev; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 489 | DECLARE_COMPLETION_ONSTACK(completion); |
| 490 | struct wlp_session session; |
| 491 | struct sk_buff *skb; |
| 492 | struct wlp_frame_assoc *resp; |
| 493 | struct wlp_uuid wssid; |
| 494 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 495 | mutex_lock(&wlp->mutex); |
| 496 | /* Send C1 association frame */ |
| 497 | result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C1); |
| 498 | if (result < 0) { |
| 499 | dev_err(dev, "Unable to send C1 frame to neighbor " |
| 500 | "%02x:%02x (%d)\n", dev_addr->data[1], |
| 501 | dev_addr->data[0], result); |
| 502 | result = 0; |
| 503 | goto out; |
| 504 | } |
| 505 | /* Create session, wait for response */ |
| 506 | session.exp_message = WLP_ASSOC_C2; |
| 507 | session.cb = wlp_session_cb; |
| 508 | session.cb_priv = &completion; |
| 509 | session.neighbor_addr = *dev_addr; |
| 510 | BUG_ON(wlp->session != NULL); |
| 511 | wlp->session = &session; |
| 512 | /* Wait for C2/F0 frame */ |
| 513 | result = wait_for_completion_interruptible_timeout(&completion, |
| 514 | WLP_PER_MSG_TIMEOUT * HZ); |
| 515 | if (result == 0) { |
| 516 | dev_err(dev, "Timeout while sending C1 to neighbor " |
| 517 | "%02x:%02x.\n", dev_addr->data[1], |
| 518 | dev_addr->data[0]); |
| 519 | goto out; |
| 520 | } |
| 521 | if (result < 0) { |
| 522 | dev_err(dev, "Unable to send C1 to neighbor %02x:%02x.\n", |
| 523 | dev_addr->data[1], dev_addr->data[0]); |
| 524 | result = 0; |
| 525 | goto out; |
| 526 | } |
| 527 | /* Parse message in session->data: it will be either C2 or F0 */ |
| 528 | skb = session.data; |
| 529 | resp = (void *) skb->data; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 530 | if (resp->type == WLP_ASSOC_F0) { |
| 531 | result = wlp_parse_f0(wlp, skb); |
| 532 | if (result < 0) |
| 533 | dev_err(dev, "WLP: unable to parse incoming F0 " |
| 534 | "frame from neighbor %02x:%02x.\n", |
| 535 | dev_addr->data[1], dev_addr->data[0]); |
| 536 | result = 0; |
| 537 | goto error_resp_parse; |
| 538 | } |
| 539 | /* WLP version and message type fields have already been parsed */ |
| 540 | result = wlp_get_wssid(wlp, (void *)resp + sizeof(*resp), &wssid, |
| 541 | skb->len - sizeof(*resp)); |
| 542 | if (result < 0) { |
| 543 | dev_err(dev, "WLP: unable to obtain WSSID from C2 frame.\n"); |
| 544 | result = 0; |
| 545 | goto error_resp_parse; |
| 546 | } |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 547 | if (!memcmp(&wssid, &wss->wssid, sizeof(wssid))) |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 548 | result = 1; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 549 | else { |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 550 | dev_err(dev, "WLP: Received a C2 frame without matching " |
| 551 | "WSSID.\n"); |
| 552 | result = 0; |
| 553 | } |
| 554 | error_resp_parse: |
| 555 | kfree_skb(skb); |
| 556 | out: |
| 557 | wlp->session = NULL; |
| 558 | mutex_unlock(&wlp->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 559 | return result; |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * Activate connection with neighbor by updating EDA cache |
| 564 | * |
| 565 | * @wss: local WSS to which neighbor wants to connect |
| 566 | * @dev_addr: neighbor's address |
| 567 | * @wssid: neighbor's WSSID - must be same as our WSS's WSSID |
| 568 | * @tag: neighbor's WSS tag used to identify frames transmitted by it |
| 569 | * @virt_addr: neighbor's virtual EUI-48 |
| 570 | */ |
| 571 | static |
| 572 | int wlp_wss_activate_connection(struct wlp *wlp, struct wlp_wss *wss, |
| 573 | struct uwb_dev_addr *dev_addr, |
| 574 | struct wlp_uuid *wssid, u8 *tag, |
| 575 | struct uwb_mac_addr *virt_addr) |
| 576 | { |
| 577 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 578 | int result = 0; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 579 | |
| 580 | if (!memcmp(wssid, &wss->wssid, sizeof(*wssid))) { |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 581 | /* Update EDA cache */ |
| 582 | result = wlp_eda_update_node(&wlp->eda, dev_addr, wss, |
| 583 | (void *) virt_addr->data, *tag, |
| 584 | WLP_WSS_CONNECTED); |
| 585 | if (result < 0) |
| 586 | dev_err(dev, "WLP: Unable to update EDA cache " |
| 587 | "with new connected neighbor information.\n"); |
| 588 | } else { |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 589 | dev_err(dev, "WLP: Neighbor does not have matching WSSID.\n"); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 590 | result = -EINVAL; |
| 591 | } |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 592 | return result; |
| 593 | } |
| 594 | |
| 595 | /** |
| 596 | * Connect to WSS neighbor |
| 597 | * |
| 598 | * Use C3/C4 exchange to determine if neighbor has WSS activated and |
| 599 | * retrieve the WSS tag and virtual EUI-48 of the neighbor. |
| 600 | */ |
| 601 | static |
| 602 | int wlp_wss_connect_neighbor(struct wlp *wlp, struct wlp_wss *wss, |
| 603 | struct uwb_dev_addr *dev_addr) |
| 604 | { |
| 605 | int result; |
| 606 | struct device *dev = &wlp->rc->uwb_dev.dev; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 607 | struct wlp_uuid wssid; |
| 608 | u8 tag; |
| 609 | struct uwb_mac_addr virt_addr; |
| 610 | DECLARE_COMPLETION_ONSTACK(completion); |
| 611 | struct wlp_session session; |
| 612 | struct wlp_frame_assoc *resp; |
| 613 | struct sk_buff *skb; |
| 614 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 615 | mutex_lock(&wlp->mutex); |
| 616 | /* Send C3 association frame */ |
| 617 | result = wlp_send_assoc_frame(wlp, wss, dev_addr, WLP_ASSOC_C3); |
| 618 | if (result < 0) { |
| 619 | dev_err(dev, "Unable to send C3 frame to neighbor " |
| 620 | "%02x:%02x (%d)\n", dev_addr->data[1], |
| 621 | dev_addr->data[0], result); |
| 622 | goto out; |
| 623 | } |
| 624 | /* Create session, wait for response */ |
| 625 | session.exp_message = WLP_ASSOC_C4; |
| 626 | session.cb = wlp_session_cb; |
| 627 | session.cb_priv = &completion; |
| 628 | session.neighbor_addr = *dev_addr; |
| 629 | BUG_ON(wlp->session != NULL); |
| 630 | wlp->session = &session; |
| 631 | /* Wait for C4/F0 frame */ |
| 632 | result = wait_for_completion_interruptible_timeout(&completion, |
| 633 | WLP_PER_MSG_TIMEOUT * HZ); |
| 634 | if (result == 0) { |
| 635 | dev_err(dev, "Timeout while sending C3 to neighbor " |
| 636 | "%02x:%02x.\n", dev_addr->data[1], |
| 637 | dev_addr->data[0]); |
| 638 | result = -ETIMEDOUT; |
| 639 | goto out; |
| 640 | } |
| 641 | if (result < 0) { |
| 642 | dev_err(dev, "Unable to send C3 to neighbor %02x:%02x.\n", |
| 643 | dev_addr->data[1], dev_addr->data[0]); |
| 644 | goto out; |
| 645 | } |
| 646 | /* Parse message in session->data: it will be either C4 or F0 */ |
| 647 | skb = session.data; |
| 648 | resp = (void *) skb->data; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 649 | if (resp->type == WLP_ASSOC_F0) { |
| 650 | result = wlp_parse_f0(wlp, skb); |
| 651 | if (result < 0) |
| 652 | dev_err(dev, "WLP: unable to parse incoming F0 " |
| 653 | "frame from neighbor %02x:%02x.\n", |
| 654 | dev_addr->data[1], dev_addr->data[0]); |
| 655 | result = -EINVAL; |
| 656 | goto error_resp_parse; |
| 657 | } |
| 658 | result = wlp_parse_c3c4_frame(wlp, skb, &wssid, &tag, &virt_addr); |
| 659 | if (result < 0) { |
| 660 | dev_err(dev, "WLP: Unable to parse C4 frame from neighbor.\n"); |
| 661 | goto error_resp_parse; |
| 662 | } |
| 663 | result = wlp_wss_activate_connection(wlp, wss, dev_addr, &wssid, &tag, |
| 664 | &virt_addr); |
| 665 | if (result < 0) { |
| 666 | dev_err(dev, "WLP: Unable to activate connection to " |
| 667 | "neighbor %02x:%02x.\n", dev_addr->data[1], |
| 668 | dev_addr->data[0]); |
| 669 | goto error_resp_parse; |
| 670 | } |
| 671 | error_resp_parse: |
| 672 | kfree_skb(skb); |
| 673 | out: |
| 674 | /* Record that we unsuccessfully tried to connect to this neighbor */ |
| 675 | if (result < 0) |
| 676 | wlp_eda_update_node_state(&wlp->eda, dev_addr, |
| 677 | WLP_WSS_CONNECT_FAILED); |
| 678 | wlp->session = NULL; |
| 679 | mutex_unlock(&wlp->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 680 | return result; |
| 681 | } |
| 682 | |
| 683 | /** |
| 684 | * Connect to neighbor with common WSS, send pending frame |
| 685 | * |
| 686 | * This function is scheduled when a frame is destined to a neighbor with |
| 687 | * which we do not have a connection. A copy of the EDA cache entry is |
| 688 | * provided - not the actual cache entry (because it is protected by a |
| 689 | * spinlock). |
| 690 | * |
| 691 | * First determine if neighbor has the same WSS activated, connect if it |
| 692 | * does. The C3/C4 exchange is dual purpose to determine if neighbor has |
| 693 | * WSS activated and proceed with the connection. |
| 694 | * |
| 695 | * The frame that triggered the connection setup is sent after connection |
| 696 | * setup. |
| 697 | * |
| 698 | * network queue is stopped - we need to restart when done |
| 699 | * |
| 700 | */ |
| 701 | static |
| 702 | void wlp_wss_connect_send(struct work_struct *ws) |
| 703 | { |
| 704 | struct wlp_assoc_conn_ctx *conn_ctx = container_of(ws, |
| 705 | struct wlp_assoc_conn_ctx, |
| 706 | ws); |
| 707 | struct wlp *wlp = conn_ctx->wlp; |
| 708 | struct sk_buff *skb = conn_ctx->skb; |
| 709 | struct wlp_eda_node *eda_entry = &conn_ctx->eda_entry; |
| 710 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 711 | struct wlp_wss *wss = &wlp->wss; |
| 712 | int result; |
| 713 | struct device *dev = &wlp->rc->uwb_dev.dev; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 714 | |
| 715 | mutex_lock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 716 | if (wss->state < WLP_WSS_STATE_ACTIVE) { |
| 717 | if (printk_ratelimit()) |
| 718 | dev_err(dev, "WLP: Attempting to connect with " |
| 719 | "WSS that is not active or connected.\n"); |
| 720 | dev_kfree_skb(skb); |
| 721 | goto out; |
| 722 | } |
| 723 | /* Establish connection - send C3 rcv C4 */ |
| 724 | result = wlp_wss_connect_neighbor(wlp, wss, dev_addr); |
| 725 | if (result < 0) { |
| 726 | if (printk_ratelimit()) |
| 727 | dev_err(dev, "WLP: Unable to establish connection " |
| 728 | "with neighbor %02x:%02x.\n", |
| 729 | dev_addr->data[1], dev_addr->data[0]); |
| 730 | dev_kfree_skb(skb); |
| 731 | goto out; |
| 732 | } |
| 733 | /* EDA entry changed, update the local copy being used */ |
| 734 | result = wlp_copy_eda_node(&wlp->eda, dev_addr, eda_entry); |
| 735 | if (result < 0) { |
| 736 | if (printk_ratelimit()) |
| 737 | dev_err(dev, "WLP: Cannot find EDA entry for " |
| 738 | "neighbor %02x:%02x \n", |
| 739 | dev_addr->data[1], dev_addr->data[0]); |
| 740 | } |
| 741 | result = wlp_wss_prep_hdr(wlp, eda_entry, skb); |
| 742 | if (result < 0) { |
| 743 | if (printk_ratelimit()) |
| 744 | dev_err(dev, "WLP: Unable to prepare frame header for " |
| 745 | "transmission (neighbor %02x:%02x). \n", |
| 746 | dev_addr->data[1], dev_addr->data[0]); |
| 747 | dev_kfree_skb(skb); |
| 748 | goto out; |
| 749 | } |
| 750 | BUG_ON(wlp->xmit_frame == NULL); |
| 751 | result = wlp->xmit_frame(wlp, skb, dev_addr); |
| 752 | if (result < 0) { |
| 753 | if (printk_ratelimit()) |
| 754 | dev_err(dev, "WLP: Unable to transmit frame: %d\n", |
| 755 | result); |
| 756 | if (result == -ENXIO) |
| 757 | dev_err(dev, "WLP: Is network interface up? \n"); |
| 758 | /* We could try again ... */ |
| 759 | dev_kfree_skb(skb);/*we need to free if tx fails */ |
| 760 | } |
| 761 | out: |
| 762 | kfree(conn_ctx); |
| 763 | BUG_ON(wlp->start_queue == NULL); |
| 764 | wlp->start_queue(wlp); |
| 765 | mutex_unlock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | /** |
| 769 | * Add WLP header to outgoing skb |
| 770 | * |
| 771 | * @eda_entry: pointer to neighbor's entry in the EDA cache |
| 772 | * @_skb: skb containing data destined to the neighbor |
| 773 | */ |
| 774 | int wlp_wss_prep_hdr(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 775 | void *_skb) |
| 776 | { |
| 777 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 778 | int result = 0; |
| 779 | unsigned char *eth_addr = eda_entry->eth_addr; |
| 780 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 781 | struct sk_buff *skb = _skb; |
| 782 | struct wlp_frame_std_abbrv_hdr *std_hdr; |
| 783 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 784 | if (eda_entry->state == WLP_WSS_CONNECTED) { |
| 785 | /* Add WLP header */ |
| 786 | BUG_ON(skb_headroom(skb) < sizeof(*std_hdr)); |
| 787 | std_hdr = (void *) __skb_push(skb, sizeof(*std_hdr)); |
| 788 | std_hdr->hdr.mux_hdr = cpu_to_le16(WLP_PROTOCOL_ID); |
| 789 | std_hdr->hdr.type = WLP_FRAME_STANDARD; |
| 790 | std_hdr->tag = eda_entry->wss->tag; |
| 791 | } else { |
| 792 | if (printk_ratelimit()) |
| 793 | dev_err(dev, "WLP: Destination neighbor (Ethernet: " |
| 794 | "%02x:%02x:%02x:%02x:%02x:%02x, Dev: " |
| 795 | "%02x:%02x) is not connected. \n", eth_addr[0], |
| 796 | eth_addr[1], eth_addr[2], eth_addr[3], |
| 797 | eth_addr[4], eth_addr[5], dev_addr->data[1], |
| 798 | dev_addr->data[0]); |
| 799 | result = -EINVAL; |
| 800 | } |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 801 | return result; |
| 802 | } |
| 803 | |
| 804 | |
| 805 | /** |
| 806 | * Prepare skb for neighbor: connect if not already and prep WLP header |
| 807 | * |
| 808 | * This function is called in interrupt context, but it needs to sleep. We |
| 809 | * temporarily stop the net queue to establish the WLP connection. |
| 810 | * Setup of the WLP connection and restart of queue is scheduled |
| 811 | * on the default work queue. |
| 812 | * |
| 813 | * run with eda->lock held (spinlock) |
| 814 | */ |
| 815 | int wlp_wss_connect_prep(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 816 | void *_skb) |
| 817 | { |
| 818 | int result = 0; |
| 819 | struct device *dev = &wlp->rc->uwb_dev.dev; |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 820 | struct sk_buff *skb = _skb; |
| 821 | struct wlp_assoc_conn_ctx *conn_ctx; |
| 822 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 823 | if (eda_entry->state == WLP_WSS_UNCONNECTED) { |
| 824 | /* We don't want any more packets while we set up connection */ |
| 825 | BUG_ON(wlp->stop_queue == NULL); |
| 826 | wlp->stop_queue(wlp); |
| 827 | conn_ctx = kmalloc(sizeof(*conn_ctx), GFP_ATOMIC); |
| 828 | if (conn_ctx == NULL) { |
| 829 | if (printk_ratelimit()) |
| 830 | dev_err(dev, "WLP: Unable to allocate memory " |
| 831 | "for connection handling.\n"); |
| 832 | result = -ENOMEM; |
| 833 | goto out; |
| 834 | } |
| 835 | conn_ctx->wlp = wlp; |
| 836 | conn_ctx->skb = skb; |
| 837 | conn_ctx->eda_entry = *eda_entry; |
| 838 | INIT_WORK(&conn_ctx->ws, wlp_wss_connect_send); |
| 839 | schedule_work(&conn_ctx->ws); |
| 840 | result = 1; |
| 841 | } else if (eda_entry->state == WLP_WSS_CONNECT_FAILED) { |
| 842 | /* Previous connection attempts failed, don't retry - see |
| 843 | * conditions for connection in WLP 0.99 [7.6.2] */ |
| 844 | if (printk_ratelimit()) |
| 845 | dev_err(dev, "Could not connect to neighbor " |
| 846 | "previously. Not retrying. \n"); |
| 847 | result = -ENONET; |
| 848 | goto out; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 849 | } else /* eda_entry->state == WLP_WSS_CONNECTED */ |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 850 | result = wlp_wss_prep_hdr(wlp, eda_entry, skb); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 851 | out: |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 852 | return result; |
| 853 | } |
| 854 | |
| 855 | /** |
| 856 | * Emulate broadcast: copy skb, send copy to neighbor (connect if not already) |
| 857 | * |
| 858 | * We need to copy skbs in the case where we emulate broadcast through |
| 859 | * unicast. We copy instead of clone because we are modifying the data of |
| 860 | * the frame after copying ... clones share data so we cannot emulate |
| 861 | * broadcast using clones. |
| 862 | * |
| 863 | * run with eda->lock held (spinlock) |
| 864 | */ |
| 865 | int wlp_wss_send_copy(struct wlp *wlp, struct wlp_eda_node *eda_entry, |
| 866 | void *_skb) |
| 867 | { |
| 868 | int result = -ENOMEM; |
| 869 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 870 | struct sk_buff *skb = _skb; |
| 871 | struct sk_buff *copy; |
| 872 | struct uwb_dev_addr *dev_addr = &eda_entry->dev_addr; |
| 873 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 874 | copy = skb_copy(skb, GFP_ATOMIC); |
| 875 | if (copy == NULL) { |
| 876 | if (printk_ratelimit()) |
| 877 | dev_err(dev, "WLP: Unable to copy skb for " |
| 878 | "transmission.\n"); |
| 879 | goto out; |
| 880 | } |
| 881 | result = wlp_wss_connect_prep(wlp, eda_entry, copy); |
| 882 | if (result < 0) { |
| 883 | if (printk_ratelimit()) |
| 884 | dev_err(dev, "WLP: Unable to connect/send skb " |
| 885 | "to neighbor.\n"); |
| 886 | dev_kfree_skb_irq(copy); |
| 887 | goto out; |
| 888 | } else if (result == 1) |
| 889 | /* Frame will be transmitted separately */ |
| 890 | goto out; |
| 891 | BUG_ON(wlp->xmit_frame == NULL); |
| 892 | result = wlp->xmit_frame(wlp, copy, dev_addr); |
| 893 | if (result < 0) { |
| 894 | if (printk_ratelimit()) |
| 895 | dev_err(dev, "WLP: Unable to transmit frame: %d\n", |
| 896 | result); |
| 897 | if ((result == -ENXIO) && printk_ratelimit()) |
| 898 | dev_err(dev, "WLP: Is network interface up? \n"); |
| 899 | /* We could try again ... */ |
| 900 | dev_kfree_skb_irq(copy);/*we need to free if tx fails */ |
| 901 | } |
| 902 | out: |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 903 | return result; |
| 904 | } |
| 905 | |
| 906 | |
| 907 | /** |
| 908 | * Setup WSS |
| 909 | * |
| 910 | * Should be called by network driver after the interface has been given a |
| 911 | * MAC address. |
| 912 | */ |
| 913 | int wlp_wss_setup(struct net_device *net_dev, struct wlp_wss *wss) |
| 914 | { |
| 915 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
| 916 | struct device *dev = &wlp->rc->uwb_dev.dev; |
| 917 | int result = 0; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 918 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 919 | mutex_lock(&wss->mutex); |
| 920 | wss->kobj.parent = &net_dev->dev.kobj; |
| 921 | if (!is_valid_ether_addr(net_dev->dev_addr)) { |
| 922 | dev_err(dev, "WLP: Invalid MAC address. Cannot use for" |
| 923 | "virtual.\n"); |
| 924 | result = -EINVAL; |
| 925 | goto out; |
| 926 | } |
| 927 | memcpy(wss->virtual_addr.data, net_dev->dev_addr, |
| 928 | sizeof(wss->virtual_addr.data)); |
| 929 | out: |
| 930 | mutex_unlock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 931 | return result; |
| 932 | } |
| 933 | EXPORT_SYMBOL_GPL(wlp_wss_setup); |
| 934 | |
| 935 | /** |
| 936 | * Remove WSS |
| 937 | * |
| 938 | * Called by client that configured WSS through wlp_wss_setup(). This |
| 939 | * function is called when client no longer needs WSS, eg. client shuts |
| 940 | * down. |
| 941 | * |
| 942 | * We remove the WLP IE from the beacon before initiating local cleanup. |
| 943 | */ |
| 944 | void wlp_wss_remove(struct wlp_wss *wss) |
| 945 | { |
| 946 | struct wlp *wlp = container_of(wss, struct wlp, wss); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 947 | |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 948 | mutex_lock(&wss->mutex); |
| 949 | if (wss->state == WLP_WSS_STATE_ACTIVE) |
| 950 | uwb_rc_ie_rm(wlp->rc, UWB_IE_WLP); |
| 951 | if (wss->state != WLP_WSS_STATE_NONE) { |
| 952 | sysfs_remove_group(&wss->kobj, &wss_attr_group); |
| 953 | kobject_put(&wss->kobj); |
| 954 | } |
| 955 | wss->kobj.parent = NULL; |
| 956 | memset(&wss->virtual_addr, 0, sizeof(wss->virtual_addr)); |
| 957 | /* Cleanup EDA cache */ |
| 958 | wlp_eda_release(&wlp->eda); |
| 959 | wlp_eda_init(&wlp->eda); |
| 960 | mutex_unlock(&wss->mutex); |
Reinette Chatre | 2f19204 | 2008-09-17 16:34:18 +0100 | [diff] [blame] | 961 | } |
| 962 | EXPORT_SYMBOL_GPL(wlp_wss_remove); |