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