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 * $FreeBSD: head/sys/net80211/ieee80211_crypto.c 195812 2009-07-21 19:36:32Z sam $ 27 */ 28 29 /* 30 * IEEE 802.11 generic crypto support. 31 */ 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 39 #include <sys/socket.h> 40 41 #include <net/if.h> 42 #include <net/if_media.h> 43 #include <net/ethernet.h> /* XXX ETHER_HDR_LEN */ 44 #include <net/route.h> 45 46 #include <netproto/802_11/ieee80211_var.h> 47 48 MALLOC_DEFINE(M_80211_CRYPTO, "80211crypto", "802.11 crypto state"); 49 50 static int _ieee80211_crypto_delkey(struct ieee80211vap *, 51 struct ieee80211_key *); 52 53 /* 54 * Table of registered cipher modules. 55 */ 56 static const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX]; 57 58 /* 59 * Default "null" key management routines. 60 */ 61 static int 62 null_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k, 63 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 64 { 65 if (!(&vap->iv_nw_keys[0] <= k && 66 k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) { 67 /* 68 * Not in the global key table, the driver should handle this 69 * by allocating a slot in the h/w key table/cache. In 70 * lieu of that return key slot 0 for any unicast key 71 * request. We disallow the request if this is a group key. 72 * This default policy does the right thing for legacy hardware 73 * with a 4 key table. It also handles devices that pass 74 * packets through untouched when marked with the WEP bit 75 * and key index 0. 76 */ 77 if (k->wk_flags & IEEE80211_KEY_GROUP) 78 return 0; 79 *keyix = 0; /* NB: use key index 0 for ucast key */ 80 } else { 81 *keyix = k - vap->iv_nw_keys; 82 } 83 *rxkeyix = IEEE80211_KEYIX_NONE; /* XXX maybe *keyix? */ 84 return 1; 85 } 86 static int 87 null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k) 88 { 89 return 1; 90 } 91 static int 92 null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k, 93 const uint8_t mac[IEEE80211_ADDR_LEN]) 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, key->wk_macaddr); 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 if (ieee80211_force_swcrypto) { 327 flags |= IEEE80211_KEY_SWCRYPT; 328 flags |= IEEE80211_KEY_SWMIC; 329 } 330 /* 331 * Hardware TKIP with software MIC is an important 332 * combination; we handle it by flagging each key, 333 * the cipher modules honor it. 334 */ 335 if (cipher == IEEE80211_CIPHER_TKIP && 336 (ic->ic_cryptocaps & IEEE80211_CRYPTO_TKIPMIC) == 0) { 337 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 338 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 339 __func__); 340 flags |= IEEE80211_KEY_SWMIC; 341 } 342 343 /* 344 * Bind cipher to key instance. Note we do this 345 * after checking the device capabilities so the 346 * cipher module can optimize space usage based on 347 * whether or not it needs to do the cipher work. 348 */ 349 if (key->wk_cipher != cip || key->wk_flags != flags) { 350 /* 351 * Fillin the flags so cipher modules can see s/w 352 * crypto requirements and potentially allocate 353 * different state and/or attach different method 354 * pointers. 355 */ 356 key->wk_flags = flags; 357 keyctx = cip->ic_attach(vap, key); 358 if (keyctx == NULL) { 359 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 360 "%s: unable to attach cipher %s\n", 361 __func__, cip->ic_name); 362 key->wk_flags = oflags; /* restore old flags */ 363 vap->iv_stats.is_crypto_attachfail++; 364 return 0; 365 } 366 cipher_detach(key); 367 key->wk_cipher = cip; /* XXX refcnt? */ 368 key->wk_private = keyctx; 369 } 370 371 /* 372 * Ask the driver for a key index if we don't have one. 373 * Note that entries in the global key table always have 374 * an index; this means it's safe to call this routine 375 * for these entries just to setup the reference to the 376 * cipher template. Note also that when using software 377 * crypto we also call the driver to give us a key index. 378 */ 379 if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { 380 if (!dev_key_alloc(vap, key, &keyix, &rxkeyix)) { 381 /* 382 * Unable to setup driver state. 383 */ 384 vap->iv_stats.is_crypto_keyfail++; 385 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 386 "%s: unable to setup cipher %s\n", 387 __func__, cip->ic_name); 388 return 0; 389 } 390 if (key->wk_flags != flags) { 391 /* 392 * Driver overrode flags we setup; typically because 393 * resources were unavailable to handle _this_ key. 394 * Re-attach the cipher context to allow cipher 395 * modules to handle differing requirements. 396 */ 397 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 398 "%s: driver override for cipher %s, flags " 399 "0x%x -> 0x%x\n", __func__, cip->ic_name, 400 oflags, key->wk_flags); 401 keyctx = cip->ic_attach(vap, key); 402 if (keyctx == NULL) { 403 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 404 "%s: unable to attach cipher %s with " 405 "flags 0x%x\n", __func__, cip->ic_name, 406 key->wk_flags); 407 key->wk_flags = oflags; /* restore old flags */ 408 vap->iv_stats.is_crypto_attachfail++; 409 return 0; 410 } 411 cipher_detach(key); 412 key->wk_cipher = cip; /* XXX refcnt? */ 413 key->wk_private = keyctx; 414 } 415 key->wk_keyix = keyix; 416 key->wk_rxkeyix = rxkeyix; 417 key->wk_flags |= IEEE80211_KEY_DEVKEY; 418 } 419 return 1; 420 } 421 422 /* 423 * Remove the key (no locking, for internal use). 424 */ 425 static int 426 _ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) 427 { 428 KASSERT(key->wk_cipher != NULL, ("No cipher!")); 429 430 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 431 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 432 __func__, key->wk_cipher->ic_name, 433 key->wk_keyix, key->wk_flags, 434 key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, 435 key->wk_keylen); 436 437 if (key->wk_flags & IEEE80211_KEY_DEVKEY) { 438 /* 439 * Remove hardware entry. 440 */ 441 /* XXX key cache */ 442 if (!dev_key_delete(vap, key)) { 443 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 444 "%s: driver did not delete key index %u\n", 445 __func__, key->wk_keyix); 446 vap->iv_stats.is_crypto_delkey++; 447 /* XXX recovery? */ 448 } 449 } 450 cipher_detach(key); 451 memset(key, 0, sizeof(*key)); 452 ieee80211_crypto_resetkey(vap, key, IEEE80211_KEYIX_NONE); 453 return 1; 454 } 455 456 /* 457 * Remove the specified key. 458 */ 459 int 460 ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) 461 { 462 int status; 463 464 ieee80211_key_update_begin(vap); 465 status = _ieee80211_crypto_delkey(vap, key); 466 ieee80211_key_update_end(vap); 467 return status; 468 } 469 470 /* 471 * Clear the global key table. 472 */ 473 void 474 ieee80211_crypto_delglobalkeys(struct ieee80211vap *vap) 475 { 476 int i; 477 478 ieee80211_key_update_begin(vap); 479 for (i = 0; i < IEEE80211_WEP_NKID; i++) 480 (void) _ieee80211_crypto_delkey(vap, &vap->iv_nw_keys[i]); 481 ieee80211_key_update_end(vap); 482 } 483 484 /* 485 * Set the contents of the specified key. 486 * 487 * Locking must be handled by the caller using: 488 * ieee80211_key_update_begin(vap); 489 * ieee80211_key_update_end(vap); 490 */ 491 int 492 ieee80211_crypto_setkey(struct ieee80211vap *vap, struct ieee80211_key *key) 493 { 494 const struct ieee80211_cipher *cip = key->wk_cipher; 495 #ifdef IEEE80211_DEBUG 496 char ethstr[ETHER_ADDRSTRLEN + 1]; 497 #endif 498 499 KASSERT(cip != NULL, ("No cipher!")); 500 501 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 502 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 503 __func__, cip->ic_name, key->wk_keyix, 504 key->wk_flags, kether_ntoa(key->wk_macaddr, ethstr), 505 key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, 506 key->wk_keylen); 507 508 if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { 509 /* XXX nothing allocated, should not happen */ 510 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 511 "%s: no device key setup done; should not happen!\n", 512 __func__); 513 vap->iv_stats.is_crypto_setkey_nokey++; 514 return 0; 515 } 516 /* 517 * Give cipher a chance to validate key contents. 518 * XXX should happen before modifying state. 519 */ 520 if (!cip->ic_setkey(key)) { 521 IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, 522 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 523 __func__, cip->ic_name, key->wk_keyix, 524 key->wk_keylen, key->wk_flags); 525 vap->iv_stats.is_crypto_setkey_cipher++; 526 return 0; 527 } 528 return dev_key_set(vap, key); 529 } 530 531 /* 532 * Add privacy headers appropriate for the specified key. 533 */ 534 struct ieee80211_key * 535 ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m) 536 { 537 struct ieee80211vap *vap = ni->ni_vap; 538 struct ieee80211_key *k; 539 struct ieee80211_frame *wh; 540 const struct ieee80211_cipher *cip; 541 uint8_t keyid; 542 543 /* 544 * Multicast traffic always uses the multicast key. 545 * Otherwise if a unicast key is set we use that and 546 * it is always key index 0. When no unicast key is 547 * set we fall back to the default transmit key. 548 */ 549 wh = mtod(m, struct ieee80211_frame *); 550 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 551 IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 552 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) { 553 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 554 wh->i_addr1, 555 "no default transmit key (%s) deftxkey %u", 556 __func__, vap->iv_def_txkey); 557 vap->iv_stats.is_tx_nodefkey++; 558 return NULL; 559 } 560 keyid = vap->iv_def_txkey; 561 k = &vap->iv_nw_keys[vap->iv_def_txkey]; 562 } else { 563 keyid = 0; 564 k = &ni->ni_ucastkey; 565 } 566 cip = k->wk_cipher; 567 return (cip->ic_encap(k, m, keyid<<6) ? k : NULL); 568 } 569 570 /* 571 * Validate and strip privacy headers (and trailer) for a 572 * received frame that has the WEP/Privacy bit set. 573 */ 574 struct ieee80211_key * 575 ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen) 576 { 577 #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) 578 #define IEEE80211_WEP_MINLEN \ 579 (sizeof(struct ieee80211_frame) + \ 580 IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) 581 struct ieee80211vap *vap = ni->ni_vap; 582 struct ieee80211_key *k; 583 struct ieee80211_frame *wh; 584 const struct ieee80211_cipher *cip; 585 uint8_t keyid; 586 587 /* NB: this minimum size data frame could be bigger */ 588 if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { 589 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 590 "%s: WEP data frame too short, len %u\n", 591 __func__, m->m_pkthdr.len); 592 vap->iv_stats.is_rx_tooshort++; /* XXX need unique stat? */ 593 return NULL; 594 } 595 596 /* 597 * Locate the key. If unicast and there is no unicast 598 * key then we fall back to the key id in the header. 599 * This assumes unicast keys are only configured when 600 * the key id in the header is meaningless (typically 0). 601 */ 602 wh = mtod(m, struct ieee80211_frame *); 603 m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid); 604 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 605 IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) 606 k = &vap->iv_nw_keys[keyid >> 6]; 607 else 608 k = &ni->ni_ucastkey; 609 610 /* 611 * Insure crypto header is contiguous for all decap work. 612 */ 613 cip = k->wk_cipher; 614 if (m->m_len < hdrlen + cip->ic_header && 615 (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) { 616 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 617 "unable to pullup %s header", cip->ic_name); 618 vap->iv_stats.is_rx_wepfail++; /* XXX */ 619 return NULL; 620 } 621 622 return (cip->ic_decap(k, m, hdrlen) ? k : NULL); 623 #undef IEEE80211_WEP_MINLEN 624 #undef IEEE80211_WEP_HDRLEN 625 } 626 627 static void 628 load_ucastkey(void *arg, struct ieee80211_node *ni) 629 { 630 struct ieee80211vap *vap = ni->ni_vap; 631 struct ieee80211_key *k; 632 633 if (vap->iv_state != IEEE80211_S_RUN) 634 return; 635 k = &ni->ni_ucastkey; 636 if (k->wk_flags & IEEE80211_KEY_DEVKEY) 637 dev_key_set(vap, k); 638 } 639 640 /* 641 * Re-load all keys known to the 802.11 layer that may 642 * have hardware state backing them. This is used by 643 * drivers on resume to push keys down into the device. 644 */ 645 void 646 ieee80211_crypto_reload_keys(struct ieee80211com *ic) 647 { 648 struct ieee80211vap *vap; 649 int i; 650 651 /* 652 * Keys in the global key table of each vap. 653 */ 654 /* NB: used only during resume so don't lock for now */ 655 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 656 if (vap->iv_state != IEEE80211_S_RUN) 657 continue; 658 for (i = 0; i < IEEE80211_WEP_NKID; i++) { 659 const struct ieee80211_key *k = &vap->iv_nw_keys[i]; 660 if (k->wk_flags & IEEE80211_KEY_DEVKEY) 661 dev_key_set(vap, k); 662 } 663 } 664 /* 665 * Unicast keys. 666 */ 667 ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL); 668 } 669