1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * IEEE 802.11 generic crypto support. 32 */ 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 #include <net/if_var.h> 44 #include <net/if_media.h> 45 #include <net/ethernet.h> /* XXX ETHER_HDR_LEN */ 46 47 #include <netproto/802_11/ieee80211_var.h> 48 49 MALLOC_DEFINE(M_80211_CRYPTO, "80211crypto", "802.11 crypto state"); 50 51 static int _ieee80211_crypto_delkey(struct ieee80211vap *, 52 struct ieee80211_key *); 53 54 /* 55 * Table of registered cipher modules. 56 */ 57 static const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX]; 58 59 /* 60 * Default "null" key management routines. 61 */ 62 static int 63 null_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k, 64 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 65 { 66 if (!(&vap->iv_nw_keys[0] <= k && 67 k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) { 68 /* 69 * Not in the global key table, the driver should handle this 70 * by allocating a slot in the h/w key table/cache. In 71 * lieu of that return key slot 0 for any unicast key 72 * request. We disallow the request if this is a group key. 73 * This default policy does the right thing for legacy hardware 74 * with a 4 key table. It also handles devices that pass 75 * packets through untouched when marked with the WEP bit 76 * and key index 0. 77 */ 78 if (k->wk_flags & IEEE80211_KEY_GROUP) 79 return 0; 80 *keyix = 0; /* NB: use key index 0 for ucast key */ 81 } else { 82 *keyix = k - vap->iv_nw_keys; 83 } 84 *rxkeyix = IEEE80211_KEYIX_NONE; /* XXX maybe *keyix? */ 85 return 1; 86 } 87 static int 88 null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k) 89 { 90 return 1; 91 } 92 static int 93 null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k) 94 { 95 return 1; 96 } 97 static void null_key_update(struct ieee80211vap *vap) {} 98 99 /* 100 * Write-arounds for common operations. 101 */ 102 static __inline void 103 cipher_detach(struct ieee80211_key *key) 104 { 105 key->wk_cipher->ic_detach(key); 106 } 107 108 static __inline void * 109 cipher_attach(struct ieee80211vap *vap, struct ieee80211_key *key) 110 { 111 return key->wk_cipher->ic_attach(vap, key); 112 } 113 114 /* 115 * Wrappers for driver key management methods. 116 */ 117 static __inline int 118 dev_key_alloc(struct ieee80211vap *vap, 119 struct ieee80211_key *key, 120 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 121 { 122 return vap->iv_key_alloc(vap, key, keyix, rxkeyix); 123 } 124 125 static __inline int 126 dev_key_delete(struct ieee80211vap *vap, 127 const struct ieee80211_key *key) 128 { 129 return vap->iv_key_delete(vap, key); 130 } 131 132 static __inline int 133 dev_key_set(struct ieee80211vap *vap, const struct ieee80211_key *key) 134 { 135 return vap->iv_key_set(vap, key); 136 } 137 138 /* 139 * Setup crypto support for a device/shared instance. 140 */ 141 void 142 ieee80211_crypto_attach(struct ieee80211com *ic) 143 { 144 /* NB: we assume everything is pre-zero'd */ 145 ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; 146 } 147 148 /* 149 * Teardown crypto support. 150 */ 151 void 152 ieee80211_crypto_detach(struct ieee80211com *ic) 153 { 154 } 155 156 /* 157 * Setup crypto support for a vap. 158 */ 159 void 160 ieee80211_crypto_vattach(struct ieee80211vap *vap) 161 { 162 int i; 163 164 /* NB: we assume everything is pre-zero'd */ 165 vap->iv_max_keyix = IEEE80211_WEP_NKID; 166 vap->iv_def_txkey = IEEE80211_KEYIX_NONE; 167 for (i = 0; i < IEEE80211_WEP_NKID; i++) 168 ieee80211_crypto_resetkey(vap, &vap->iv_nw_keys[i], 169 IEEE80211_KEYIX_NONE); 170 /* 171 * Initialize the driver key support routines to noop entries. 172 * This is useful especially for the cipher test modules. 173 */ 174 vap->iv_key_alloc = null_key_alloc; 175 vap->iv_key_set = null_key_set; 176 vap->iv_key_delete = null_key_delete; 177 vap->iv_key_update_begin = null_key_update; 178 vap->iv_key_update_end = null_key_update; 179 } 180 181 /* 182 * Teardown crypto support for a vap. 183 */ 184 void 185 ieee80211_crypto_vdetach(struct ieee80211vap *vap) 186 { 187 ieee80211_crypto_delglobalkeys(vap); 188 } 189 190 /* 191 * Register a crypto cipher module. 192 */ 193 void 194 ieee80211_crypto_register(const struct ieee80211_cipher *cip) 195 { 196 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 197 kprintf("%s: cipher %s has an invalid cipher index %u\n", 198 __func__, cip->ic_name, cip->ic_cipher); 199 return; 200 } 201 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 202 kprintf("%s: cipher %s registered with a different template\n", 203 __func__, cip->ic_name); 204 return; 205 } 206 ciphers[cip->ic_cipher] = cip; 207 } 208 209 /* 210 * Unregister a crypto cipher module. 211 */ 212 void 213 ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) 214 { 215 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 216 kprintf("%s: cipher %s has an invalid cipher index %u\n", 217 __func__, cip->ic_name, cip->ic_cipher); 218 return; 219 } 220 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 221 kprintf("%s: cipher %s registered with a different template\n", 222 __func__, cip->ic_name); 223 return; 224 } 225 /* NB: don't complain about not being registered */ 226 /* XXX disallow if references */ 227 ciphers[cip->ic_cipher] = NULL; 228 } 229 230 int 231 ieee80211_crypto_available(u_int cipher) 232 { 233 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; 234 } 235 236 /* XXX well-known names! */ 237 static const char *cipher_modnames[IEEE80211_CIPHER_MAX] = { 238 [IEEE80211_CIPHER_WEP] = "wlan_wep", 239 [IEEE80211_CIPHER_TKIP] = "wlan_tkip", 240 [IEEE80211_CIPHER_AES_OCB] = "wlan_aes_ocb", 241 [IEEE80211_CIPHER_AES_CCM] = "wlan_ccmp", 242 [IEEE80211_CIPHER_TKIPMIC] = "#4", /* NB: reserved */ 243 [IEEE80211_CIPHER_CKIP] = "wlan_ckip", 244 [IEEE80211_CIPHER_NONE] = "wlan_none", 245 }; 246 247 /* NB: there must be no overlap between user-supplied and device-owned flags */ 248 CTASSERT((IEEE80211_KEY_COMMON & IEEE80211_KEY_DEVICE) == 0); 249 250 /* 251 * Establish a relationship between the specified key and cipher 252 * and, if necessary, allocate a hardware index from the driver. 253 * Note that when a fixed key index is required it must be specified. 254 * 255 * This must be the first call applied to a key; all the other key 256 * routines assume wk_cipher is setup. 257 * 258 * Locking must be handled by the caller using: 259 * ieee80211_key_update_begin(vap); 260 * ieee80211_key_update_end(vap); 261 */ 262 int 263 ieee80211_crypto_newkey(struct ieee80211vap *vap, 264 int cipher, int flags, struct ieee80211_key *key) 265 { 266 struct ieee80211com *ic = vap->iv_ic; 267 const struct ieee80211_cipher *cip; 268 ieee80211_keyix keyix, rxkeyix; 269 void *keyctx; 270 int oflags; 271 272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 273 "%s: cipher %u flags 0x%x keyix %u\n", 274 __func__, cipher, flags, key->wk_keyix); 275 276 /* 277 * Validate cipher and set reference to cipher routines. 278 */ 279 if (cipher >= IEEE80211_CIPHER_MAX) { 280 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 281 "%s: invalid cipher %u\n", __func__, cipher); 282 vap->iv_stats.is_crypto_badcipher++; 283 return 0; 284 } 285 cip = ciphers[cipher]; 286 if (cip == NULL) { 287 /* 288 * Auto-load cipher module if we have a well-known name 289 * for it. It might be better to use string names rather 290 * than numbers and craft a module name based on the cipher 291 * name; e.g. wlan_cipher_<cipher-name>. 292 */ 293 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 294 "%s: unregistered cipher %u, load module %s\n", 295 __func__, cipher, cipher_modnames[cipher]); 296 ieee80211_load_module(cipher_modnames[cipher]); 297 /* 298 * If cipher module loaded it should immediately 299 * call ieee80211_crypto_register which will fill 300 * in the entry in the ciphers array. 301 */ 302 cip = ciphers[cipher]; 303 if (cip == NULL) { 304 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 305 "%s: unable to load cipher %u, module %s\n", 306 __func__, cipher, cipher_modnames[cipher]); 307 vap->iv_stats.is_crypto_nocipher++; 308 return 0; 309 } 310 } 311 312 oflags = key->wk_flags; 313 flags &= IEEE80211_KEY_COMMON; 314 /* NB: preserve device attributes */ 315 flags |= (oflags & IEEE80211_KEY_DEVICE); 316 /* 317 * If the hardware does not support the cipher then 318 * fallback to a host-based implementation. 319 */ 320 if ((ic->ic_cryptocaps & (1<<cipher)) == 0) { 321 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 322 "%s: no h/w support for cipher %s, falling back to s/w\n", 323 __func__, cip->ic_name); 324 flags |= IEEE80211_KEY_SWCRYPT; 325 } 326 /* 327 * Hardware TKIP with software MIC is an important 328 * combination; we handle it by flagging each key, 329 * the cipher modules honor it. 330 */ 331 if (cipher == IEEE80211_CIPHER_TKIP && 332 (ic->ic_cryptocaps & IEEE80211_CRYPTO_TKIPMIC) == 0) { 333 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 334 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 335 __func__); 336 flags |= IEEE80211_KEY_SWMIC; 337 } 338 339 /* 340 * Bind cipher to key instance. Note we do this 341 * after checking the device capabilities so the 342 * cipher module can optimize space usage based on 343 * whether or not it needs to do the cipher work. 344 */ 345 if (key->wk_cipher != cip || key->wk_flags != flags) { 346 /* 347 * Fillin the flags so cipher modules can see s/w 348 * crypto requirements and potentially allocate 349 * different state and/or attach different method 350 * pointers. 351 */ 352 key->wk_flags = flags; 353 keyctx = cip->ic_attach(vap, key); 354 if (keyctx == NULL) { 355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 356 "%s: unable to attach cipher %s\n", 357 __func__, cip->ic_name); 358 key->wk_flags = oflags; /* restore old flags */ 359 vap->iv_stats.is_crypto_attachfail++; 360 return 0; 361 } 362 cipher_detach(key); 363 key->wk_cipher = cip; /* XXX refcnt? */ 364 key->wk_private = keyctx; 365 } 366 367 /* 368 * Ask the driver for a key index if we don't have one. 369 * Note that entries in the global key table always have 370 * an index; this means it's safe to call this routine 371 * for these entries just to setup the reference to the 372 * cipher template. Note also that when using software 373 * crypto we also call the driver to give us a key index. 374 */ 375 if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { 376 if (!dev_key_alloc(vap, key, &keyix, &rxkeyix)) { 377 /* 378 * Unable to setup driver state. 379 */ 380 vap->iv_stats.is_crypto_keyfail++; 381 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 382 "%s: unable to setup cipher %s\n", 383 __func__, cip->ic_name); 384 return 0; 385 } 386 if (key->wk_flags != flags) { 387 /* 388 * Driver overrode flags we setup; typically because 389 * resources were unavailable to handle _this_ key. 390 * Re-attach the cipher context to allow cipher 391 * modules to handle differing requirements. 392 */ 393 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 394 "%s: driver override for cipher %s, flags " 395 "0x%x -> 0x%x\n", __func__, cip->ic_name, 396 oflags, key->wk_flags); 397 keyctx = cip->ic_attach(vap, key); 398 if (keyctx == NULL) { 399 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 400 "%s: unable to attach cipher %s with " 401 "flags 0x%x\n", __func__, cip->ic_name, 402 key->wk_flags); 403 key->wk_flags = oflags; /* restore old flags */ 404 vap->iv_stats.is_crypto_attachfail++; 405 return 0; 406 } 407 cipher_detach(key); 408 key->wk_cipher = cip; /* XXX refcnt? */ 409 key->wk_private = keyctx; 410 } 411 key->wk_keyix = keyix; 412 key->wk_rxkeyix = rxkeyix; 413 key->wk_flags |= IEEE80211_KEY_DEVKEY; 414 } 415 return 1; 416 } 417 418 /* 419 * Remove the key (no locking, for internal use). 420 */ 421 static int 422 _ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) 423 { 424 KASSERT(key->wk_cipher != NULL, ("No cipher!")); 425 426 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 427 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 428 __func__, key->wk_cipher->ic_name, 429 key->wk_keyix, key->wk_flags, 430 key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, 431 key->wk_keylen); 432 433 if (key->wk_flags & IEEE80211_KEY_DEVKEY) { 434 /* 435 * Remove hardware entry. 436 */ 437 /* XXX key cache */ 438 if (!dev_key_delete(vap, key)) { 439 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 440 "%s: driver did not delete key index %u\n", 441 __func__, key->wk_keyix); 442 vap->iv_stats.is_crypto_delkey++; 443 /* XXX recovery? */ 444 } 445 } 446 cipher_detach(key); 447 memset(key, 0, sizeof(*key)); 448 ieee80211_crypto_resetkey(vap, key, IEEE80211_KEYIX_NONE); 449 return 1; 450 } 451 452 /* 453 * Remove the specified key. 454 */ 455 int 456 ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) 457 { 458 int status; 459 460 ieee80211_key_update_begin(vap); 461 status = _ieee80211_crypto_delkey(vap, key); 462 ieee80211_key_update_end(vap); 463 return status; 464 } 465 466 /* 467 * Clear the global key table. 468 */ 469 void 470 ieee80211_crypto_delglobalkeys(struct ieee80211vap *vap) 471 { 472 int i; 473 474 ieee80211_key_update_begin(vap); 475 for (i = 0; i < IEEE80211_WEP_NKID; i++) 476 (void) _ieee80211_crypto_delkey(vap, &vap->iv_nw_keys[i]); 477 ieee80211_key_update_end(vap); 478 } 479 480 /* 481 * Set the contents of the specified key. 482 * 483 * Locking must be handled by the caller using: 484 * ieee80211_key_update_begin(vap); 485 * ieee80211_key_update_end(vap); 486 */ 487 int 488 ieee80211_crypto_setkey(struct ieee80211vap *vap, struct ieee80211_key *key) 489 { 490 const struct ieee80211_cipher *cip = key->wk_cipher; 491 492 KASSERT(cip != NULL, ("No cipher!")); 493 494 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 495 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 496 __func__, cip->ic_name, key->wk_keyix, 497 key->wk_flags, ether_sprintf(key->wk_macaddr), 498 key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, 499 key->wk_keylen); 500 501 if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { 502 /* XXX nothing allocated, should not happen */ 503 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 504 "%s: no device key setup done; should not happen!\n", 505 __func__); 506 vap->iv_stats.is_crypto_setkey_nokey++; 507 return 0; 508 } 509 /* 510 * Give cipher a chance to validate key contents. 511 * XXX should happen before modifying state. 512 */ 513 if (!cip->ic_setkey(key)) { 514 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 515 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 516 __func__, cip->ic_name, key->wk_keyix, 517 key->wk_keylen, key->wk_flags); 518 vap->iv_stats.is_crypto_setkey_cipher++; 519 return 0; 520 } 521 return dev_key_set(vap, key); 522 } 523 524 uint8_t 525 ieee80211_crypto_get_keyid(struct ieee80211vap *vap, struct ieee80211_key *k) 526 { 527 if (k >= &vap->iv_nw_keys[0] && 528 k < &vap->iv_nw_keys[IEEE80211_WEP_NKID]) 529 return (k - vap->iv_nw_keys); 530 else 531 return (0); 532 } 533 534 struct ieee80211_key * 535 ieee80211_crypto_get_txkey(struct ieee80211_node *ni, struct mbuf *m) 536 { 537 struct ieee80211vap *vap = ni->ni_vap; 538 struct ieee80211_frame *wh; 539 540 /* 541 * Multicast traffic always uses the multicast key. 542 * Otherwise if a unicast key is set we use that and 543 * it is always key index 0. When no unicast key is 544 * set we fall back to the default transmit key. 545 */ 546 wh = mtod(m, struct ieee80211_frame *); 547 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 548 IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 549 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) { 550 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 551 wh->i_addr1, 552 "no default transmit key (%s) deftxkey %u", 553 __func__, vap->iv_def_txkey); 554 vap->iv_stats.is_tx_nodefkey++; 555 return NULL; 556 } 557 return &vap->iv_nw_keys[vap->iv_def_txkey]; 558 } 559 560 return &ni->ni_ucastkey; 561 } 562 563 /* 564 * Add privacy headers appropriate for the specified key. 565 */ 566 struct ieee80211_key * 567 ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m) 568 { 569 struct ieee80211_key *k; 570 const struct ieee80211_cipher *cip; 571 572 if ((k = ieee80211_crypto_get_txkey(ni, m)) != NULL) { 573 cip = k->wk_cipher; 574 return (cip->ic_encap(k, m) ? k : NULL); 575 } 576 577 return NULL; 578 } 579 580 /* 581 * Validate and strip privacy headers (and trailer) for a 582 * received frame that has the WEP/Privacy bit set. 583 */ 584 struct ieee80211_key * 585 ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen) 586 { 587 #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) 588 #define IEEE80211_WEP_MINLEN \ 589 (sizeof(struct ieee80211_frame) + \ 590 IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) 591 struct ieee80211vap *vap = ni->ni_vap; 592 struct ieee80211_key *k; 593 struct ieee80211_frame *wh; 594 const struct ieee80211_cipher *cip; 595 uint8_t keyid; 596 597 /* NB: this minimum size data frame could be bigger */ 598 if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { 599 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 600 "%s: WEP data frame too short, len %u\n", 601 __func__, m->m_pkthdr.len); 602 vap->iv_stats.is_rx_tooshort++; /* XXX need unique stat? */ 603 return NULL; 604 } 605 606 /* 607 * Locate the key. If unicast and there is no unicast 608 * key then we fall back to the key id in the header. 609 * This assumes unicast keys are only configured when 610 * the key id in the header is meaningless (typically 0). 611 */ 612 wh = mtod(m, struct ieee80211_frame *); 613 m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid); 614 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 615 IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) 616 k = &vap->iv_nw_keys[keyid >> 6]; 617 else 618 k = &ni->ni_ucastkey; 619 620 /* 621 * Insure crypto header is contiguous for all decap work. 622 */ 623 cip = k->wk_cipher; 624 if (m->m_len < hdrlen + cip->ic_header && 625 (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) { 626 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 627 "unable to pullup %s header", cip->ic_name); 628 vap->iv_stats.is_rx_wepfail++; /* XXX */ 629 return NULL; 630 } 631 632 return (cip->ic_decap(k, m, hdrlen) ? k : NULL); 633 #undef IEEE80211_WEP_MINLEN 634 #undef IEEE80211_WEP_HDRLEN 635 } 636 637 static void 638 load_ucastkey(void *arg, struct ieee80211_node *ni) 639 { 640 struct ieee80211vap *vap = ni->ni_vap; 641 struct ieee80211_key *k; 642 643 if (vap->iv_state != IEEE80211_S_RUN) 644 return; 645 k = &ni->ni_ucastkey; 646 if (k->wk_flags & IEEE80211_KEY_DEVKEY) 647 dev_key_set(vap, k); 648 } 649 650 /* 651 * Re-load all keys known to the 802.11 layer that may 652 * have hardware state backing them. This is used by 653 * drivers on resume to push keys down into the device. 654 */ 655 void 656 ieee80211_crypto_reload_keys(struct ieee80211com *ic) 657 { 658 struct ieee80211vap *vap; 659 int i; 660 661 /* 662 * Keys in the global key table of each vap. 663 */ 664 /* NB: used only during resume so don't lock for now */ 665 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 666 if (vap->iv_state != IEEE80211_S_RUN) 667 continue; 668 for (i = 0; i < IEEE80211_WEP_NKID; i++) { 669 const struct ieee80211_key *k = &vap->iv_nw_keys[i]; 670 if (k->wk_flags & IEEE80211_KEY_DEVKEY) 671 dev_key_set(vap, k); 672 } 673 } 674 /* 675 * Unicast keys. 676 */ 677 ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL); 678 } 679