ieee80211_output.c revision 138609
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2004 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 138609 2004-12-08 22:34:07Z sam $"); 35 36#include "opt_inet.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/mbuf.h> 41#include <sys/kernel.h> 42#include <sys/endian.h> 43 44#include <sys/socket.h> 45 46#include <net/bpf.h> 47#include <net/ethernet.h> 48#include <net/if.h> 49#include <net/if_llc.h> 50#include <net/if_media.h> 51#include <net/if_vlan_var.h> 52 53#include <net80211/ieee80211_var.h> 54 55#ifdef INET 56#include <netinet/in.h> 57#include <netinet/if_ether.h> 58#include <netinet/in_systm.h> 59#include <netinet/ip.h> 60#endif 61 62#ifdef IEEE80211_DEBUG 63/* 64 * Decide if an outbound management frame should be 65 * printed when debugging is enabled. This filters some 66 * of the less interesting frames that come frequently 67 * (e.g. beacons). 68 */ 69static __inline int 70doprint(struct ieee80211com *ic, int subtype) 71{ 72 switch (subtype) { 73 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 74 return (ic->ic_opmode == IEEE80211_M_IBSS); 75 } 76 return 1; 77} 78#endif 79 80/* 81 * Send a management frame to the specified node. The node pointer 82 * must have a reference as the pointer will be passed to the driver 83 * and potentially held for a long time. If the frame is successfully 84 * dispatched to the driver, then it is responsible for freeing the 85 * reference (and potentially free'ing up any associated storage). 86 */ 87static int 88ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 89 struct mbuf *m, int type) 90{ 91 struct ifnet *ifp = ic->ic_ifp; 92 struct ieee80211_frame *wh; 93 94 KASSERT(ni != NULL, ("null node")); 95 96 /* 97 * Yech, hack alert! We want to pass the node down to the 98 * driver's start routine. If we don't do so then the start 99 * routine must immediately look it up again and that can 100 * cause a lock order reversal if, for example, this frame 101 * is being sent because the station is being timedout and 102 * the frame being sent is a DEAUTH message. We could stick 103 * this in an m_tag and tack that on to the mbuf. However 104 * that's rather expensive to do for every frame so instead 105 * we stuff it in the rcvif field since outbound frames do 106 * not (presently) use this. 107 */ 108 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 109 if (m == NULL) 110 return ENOMEM; 111 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 112 m->m_pkthdr.rcvif = (void *)ni; 113 114 wh = mtod(m, struct ieee80211_frame *); 115 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type; 116 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 117 *(u_int16_t *)wh->i_dur = 0; 118 *(u_int16_t *)wh->i_seq = 119 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 120 ni->ni_txseqs[0]++; 121 /* 122 * Hack. When sending PROBE_REQ frames while scanning we 123 * explicitly force a broadcast rather than (as before) clobber 124 * ni_macaddr and ni_bssid. This is stopgap, we need a way 125 * to communicate this directly rather than do something 126 * implicit based on surrounding state. 127 */ 128 if (type == IEEE80211_FC0_SUBTYPE_PROBE_REQ && 129 (ic->ic_flags & IEEE80211_F_SCAN)) { 130 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 131 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 132 IEEE80211_ADDR_COPY(wh->i_addr3, ifp->if_broadcastaddr); 133 } else { 134 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 135 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 136 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 137 } 138 139 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 140 m->m_flags &= ~M_LINK0; 141 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 142 "[%s] encrypting frame (%s)\n", 143 ether_sprintf(wh->i_addr1), __func__); 144 wh->i_fc[1] |= IEEE80211_FC1_WEP; 145 } 146#ifdef IEEE80211_DEBUG 147 /* avoid printing too many frames */ 148 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 149 ieee80211_msg_dumppkts(ic)) { 150 printf("[%s] send %s on channel %u\n", 151 ether_sprintf(wh->i_addr1), 152 ieee80211_mgt_subtype_name[ 153 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 154 IEEE80211_FC0_SUBTYPE_SHIFT], 155 ieee80211_chan2ieee(ic, ni->ni_chan)); 156 } 157#endif 158 IEEE80211_NODE_STAT(ni, tx_mgmt); 159 IF_ENQUEUE(&ic->ic_mgtq, m); 160 ifp->if_timer = 1; 161 if_start(ifp); 162 return 0; 163} 164 165/* 166 * Send a null data frame to the specified node. 167 */ 168int 169ieee80211_send_nulldata(struct ieee80211com *ic, struct ieee80211_node *ni) 170{ 171 struct ifnet *ifp = ic->ic_ifp; 172 struct mbuf *m; 173 struct ieee80211_frame *wh; 174 175 MGETHDR(m, M_NOWAIT, MT_HEADER); 176 if (m == NULL) { 177 /* XXX debug msg */ 178 ic->ic_stats.is_tx_nobuf++; 179 return ENOMEM; 180 } 181 m->m_pkthdr.rcvif = (void *) ieee80211_ref_node(ni); 182 183 wh = mtod(m, struct ieee80211_frame *); 184 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA | 185 IEEE80211_FC0_SUBTYPE_NODATA; 186 *(u_int16_t *)wh->i_dur = 0; 187 *(u_int16_t *)wh->i_seq = 188 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 189 ni->ni_txseqs[0]++; 190 191 /* XXX WDS */ 192 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 193 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 194 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 195 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_myaddr); 196 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 197 198 IEEE80211_NODE_STAT(ni, tx_data); 199 200 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 201 if_start(ifp); 202 203 return 0; 204} 205 206/* 207 * Insure there is sufficient contiguous space to encapsulate the 208 * 802.11 data frame. If room isn't already there, arrange for it. 209 * Drivers and cipher modules assume we have done the necessary work 210 * and fail rudely if they don't find the space they need. 211 */ 212static struct mbuf * 213ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 214 struct ieee80211_key *key, struct mbuf *m) 215{ 216#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 217 int needed_space = hdrsize; 218 219 if (key != NULL) { 220 /* XXX belongs in crypto code? */ 221 needed_space += key->wk_cipher->ic_header; 222 /* XXX frags */ 223 } 224 /* 225 * We know we are called just before stripping an Ethernet 226 * header and prepending an LLC header. This means we know 227 * there will be 228 * sizeof(struct ether_header) - sizeof(struct llc) 229 * bytes recovered to which we need additional space for the 230 * 802.11 header and any crypto header. 231 */ 232 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 233 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 234 if (n == NULL) { 235 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 236 "%s: cannot expand storage\n", __func__); 237 ic->ic_stats.is_tx_nobuf++; 238 m_freem(m); 239 return NULL; 240 } 241 KASSERT(needed_space <= MHLEN, 242 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 243 /* 244 * Setup new mbuf to have leading space to prepend the 245 * 802.11 header and any crypto header bits that are 246 * required (the latter are added when the driver calls 247 * back to ieee80211_crypto_encap to do crypto encapsulation). 248 */ 249 /* NB: must be first 'cuz it clobbers m_data */ 250 m_move_pkthdr(n, m); 251 n->m_len = 0; /* NB: m_gethdr does not set */ 252 n->m_data += needed_space; 253 /* 254 * Pull up Ethernet header to create the expected layout. 255 * We could use m_pullup but that's overkill (i.e. we don't 256 * need the actual data) and it cannot fail so do it inline 257 * for speed. 258 */ 259 /* NB: struct ether_header is known to be contiguous */ 260 n->m_len += sizeof(struct ether_header); 261 m->m_len -= sizeof(struct ether_header); 262 m->m_data += sizeof(struct ether_header); 263 /* 264 * Replace the head of the chain. 265 */ 266 n->m_next = m; 267 m = n; 268 } 269 return m; 270#undef TO_BE_RECLAIMED 271} 272 273/* 274 * Assign priority to a frame based on any vlan tag assigned 275 * to the station and/or any Diffserv setting in an IP header. 276 * Finally, if an ACM policy is setup (in station mode) it's 277 * applied. 278 */ 279int 280ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 281{ 282 int v_wme_ac, d_wme_ac, ac; 283#ifdef INET 284 struct ether_header *eh; 285#endif 286 287 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 288 ac = WME_AC_BE; 289 goto done; 290 } 291 292 /* 293 * If node has a vlan tag then all traffic 294 * to it must have a matching tag. 295 */ 296 v_wme_ac = 0; 297 if (ni->ni_vlan != 0) { 298 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m); 299 if (mtag != NULL) { 300 IEEE80211_NODE_STAT(ni, tx_novlantag); 301 return 1; 302 } 303 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 304 EVL_VLANOFTAG(ni->ni_vlan)) { 305 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 306 return 1; 307 } 308 /* map vlan priority to AC */ 309 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 310 case 1: 311 case 2: 312 v_wme_ac = WME_AC_BK; 313 break; 314 case 0: 315 case 3: 316 v_wme_ac = WME_AC_BE; 317 break; 318 case 4: 319 case 5: 320 v_wme_ac = WME_AC_VI; 321 break; 322 case 6: 323 case 7: 324 v_wme_ac = WME_AC_VO; 325 break; 326 } 327 } 328 329#ifdef INET 330 eh = mtod(m, struct ether_header *); 331 if (eh->ether_type == htons(ETHERTYPE_IP)) { 332 const struct ip *ip = (struct ip *) 333 (mtod(m, u_int8_t *) + sizeof (*eh)); 334 /* 335 * IP frame, map the TOS field. 336 */ 337 switch (ip->ip_tos) { 338 case 0x08: 339 case 0x20: 340 d_wme_ac = WME_AC_BK; /* background */ 341 break; 342 case 0x28: 343 case 0xa0: 344 d_wme_ac = WME_AC_VI; /* video */ 345 break; 346 case 0x30: /* voice */ 347 case 0xe0: 348 case 0x88: /* XXX UPSD */ 349 case 0xb8: 350 d_wme_ac = WME_AC_VO; 351 break; 352 default: 353 d_wme_ac = WME_AC_BE; 354 break; 355 } 356 } else { 357#endif /* INET */ 358 d_wme_ac = WME_AC_BE; 359#ifdef INET 360 } 361#endif 362 /* 363 * Use highest priority AC. 364 */ 365 if (v_wme_ac > d_wme_ac) 366 ac = v_wme_ac; 367 else 368 ac = d_wme_ac; 369 370 /* 371 * Apply ACM policy. 372 */ 373 if (ic->ic_opmode == IEEE80211_M_STA) { 374 static const int acmap[4] = { 375 WME_AC_BK, /* WME_AC_BE */ 376 WME_AC_BK, /* WME_AC_BK */ 377 WME_AC_BE, /* WME_AC_VI */ 378 WME_AC_VI, /* WME_AC_VO */ 379 }; 380 while (ac != WME_AC_BK && 381 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 382 ac = acmap[ac]; 383 } 384done: 385 M_WME_SETAC(m, ac); 386 return 0; 387} 388 389/* 390 * Return the transmit key to use in sending a frame to the specified 391 * destination. Multicast traffic always uses the group key which is 392 * installed the default tx key. Otherwise if a unicast key is set 393 * we use that. When no unicast key is set we fall back to the default 394 * transmit key unless WPA is enabled in which case there should be 395 * a unicast frame so we don't want to use a default key (which in 396 * this case is the group/multicast key). 397 */ 398static __inline struct ieee80211_key * 399ieee80211_crypto_getkey(struct ieee80211com *ic, 400 const u_int8_t mac[IEEE80211_ADDR_LEN], struct ieee80211_node *ni) 401{ 402#define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none) 403 if (IEEE80211_IS_MULTICAST(mac)) { 404 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 405 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 406 return NULL; 407 return &ic->ic_nw_keys[ic->ic_def_txkey]; 408 } else if (KEY_UNDEFINED(ni->ni_ucastkey)) { 409 if ((ic->ic_flags & IEEE80211_F_WPA) || 410 ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 411 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 412 return NULL; 413 return &ic->ic_nw_keys[ic->ic_def_txkey]; 414 } else { 415 return &ni->ni_ucastkey; 416 } 417#undef KEY_UNDEFINED 418} 419 420/* 421 * Encapsulate an outbound data frame. The mbuf chain is updated. 422 * If an error is encountered NULL is returned. The caller is required 423 * to provide a node reference and pullup the ethernet header in the 424 * first mbuf. 425 */ 426struct mbuf * 427ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 428 struct ieee80211_node *ni) 429{ 430 struct ether_header eh; 431 struct ieee80211_frame *wh; 432 struct ieee80211_key *key; 433 struct llc *llc; 434 int hdrsize, datalen; 435 436 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 437 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 438 439 /* 440 * Insure space for additional headers. First identify 441 * transmit key to use in calculating any buffer adjustments 442 * required. This is also used below to do privacy 443 * encapsulation work. Then calculate the 802.11 header 444 * size and any padding required by the driver. 445 * 446 * Note key may be NULL if we fall back to the default 447 * transmit key and that is not set. In that case the 448 * buffer may not be expanded as needed by the cipher 449 * routines, but they will/should discard it. 450 */ 451 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 452 key = ieee80211_crypto_getkey(ic, eh.ether_dhost, ni); 453 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 454 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 455 "[%s] no default transmit key\n", 456 ether_sprintf(ni->ni_macaddr)); 457 /* XXX statistic */ 458 } 459 } else 460 key = NULL; 461 /* XXX 4-address format */ 462 if (ni->ni_flags & IEEE80211_NODE_QOS) 463 hdrsize = sizeof(struct ieee80211_qosframe); 464 else 465 hdrsize = sizeof(struct ieee80211_frame); 466 if (ic->ic_flags & IEEE80211_F_DATAPAD) 467 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 468 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 469 if (m == NULL) { 470 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 471 goto bad; 472 } 473 474 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 475 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 476 llc = mtod(m, struct llc *); 477 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 478 llc->llc_control = LLC_UI; 479 llc->llc_snap.org_code[0] = 0; 480 llc->llc_snap.org_code[1] = 0; 481 llc->llc_snap.org_code[2] = 0; 482 llc->llc_snap.ether_type = eh.ether_type; 483 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 484 485 M_PREPEND(m, hdrsize, M_DONTWAIT); 486 if (m == NULL) { 487 ic->ic_stats.is_tx_nobuf++; 488 goto bad; 489 } 490 wh = mtod(m, struct ieee80211_frame *); 491 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 492 *(u_int16_t *)wh->i_dur = 0; 493 switch (ic->ic_opmode) { 494 case IEEE80211_M_STA: 495 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 496 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 497 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 498 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 499 break; 500 case IEEE80211_M_IBSS: 501 case IEEE80211_M_AHDEMO: 502 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 503 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 504 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 505 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 506 break; 507 case IEEE80211_M_HOSTAP: 508 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 509 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 510 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 511 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 512 break; 513 case IEEE80211_M_MONITOR: 514 goto bad; 515 } 516 if (eh.ether_type != htons(ETHERTYPE_PAE) || 517 (key != NULL && (ic->ic_flags & IEEE80211_F_WPA))) { 518 /* 519 * IEEE 802.1X: send EAPOL frames always in the clear. 520 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 521 */ 522 if (key != NULL) { 523 wh->i_fc[1] |= IEEE80211_FC1_WEP; 524 /* XXX do fragmentation */ 525 if (!ieee80211_crypto_enmic(ic, key, m)) { 526 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 527 "[%s] enmic failed, discard frame\n", 528 ether_sprintf(eh.ether_dhost)); 529 /* XXX statistic */ 530 goto bad; 531 } 532 } 533 } 534 535 if (ni->ni_flags & IEEE80211_NODE_QOS) { 536 struct ieee80211_qosframe *qwh = 537 (struct ieee80211_qosframe *) wh; 538 int ac, tid; 539 540 ac = M_WME_GETAC(m); 541 /* map from access class/queue to 11e header priorty value */ 542 tid = WME_AC_TO_TID(ac); 543 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 544 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 545 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 546 qwh->i_qos[1] = 0; 547 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 548 549 *(u_int16_t *)wh->i_seq = 550 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 551 ni->ni_txseqs[tid]++; 552 } else { 553 *(u_int16_t *)wh->i_seq = 554 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 555 ni->ni_txseqs[0]++; 556 } 557 558 IEEE80211_NODE_STAT(ni, tx_data); 559 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 560 561 return m; 562bad: 563 if (m != NULL) 564 m_freem(m); 565 return NULL; 566} 567 568/* 569 * Add a supported rates element id to a frame. 570 */ 571static u_int8_t * 572ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 573{ 574 int nrates; 575 576 *frm++ = IEEE80211_ELEMID_RATES; 577 nrates = rs->rs_nrates; 578 if (nrates > IEEE80211_RATE_SIZE) 579 nrates = IEEE80211_RATE_SIZE; 580 *frm++ = nrates; 581 memcpy(frm, rs->rs_rates, nrates); 582 return frm + nrates; 583} 584 585/* 586 * Add an extended supported rates element id to a frame. 587 */ 588static u_int8_t * 589ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 590{ 591 /* 592 * Add an extended supported rates element if operating in 11g mode. 593 */ 594 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 595 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 596 *frm++ = IEEE80211_ELEMID_XRATES; 597 *frm++ = nrates; 598 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 599 frm += nrates; 600 } 601 return frm; 602} 603 604/* 605 * Add an ssid elemet to a frame. 606 */ 607static u_int8_t * 608ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 609{ 610 *frm++ = IEEE80211_ELEMID_SSID; 611 *frm++ = len; 612 memcpy(frm, ssid, len); 613 return frm + len; 614} 615 616/* 617 * Add an erp element to a frame. 618 */ 619static u_int8_t * 620ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 621{ 622 u_int8_t erp; 623 624 *frm++ = IEEE80211_ELEMID_ERP; 625 *frm++ = 1; 626 erp = 0; 627 if (ic->ic_nonerpsta != 0) 628 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 629 if (ic->ic_flags & IEEE80211_F_USEPROT) 630 erp |= IEEE80211_ERP_USE_PROTECTION; 631 if (ic->ic_flags & IEEE80211_F_USEBARKER) 632 erp |= IEEE80211_ERP_LONG_PREAMBLE; 633 *frm++ = erp; 634 return frm; 635} 636 637static u_int8_t * 638ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 639{ 640#define WPA_OUI_BYTES 0x00, 0x50, 0xf2 641#define ADDSHORT(frm, v) do { \ 642 frm[0] = (v) & 0xff; \ 643 frm[1] = (v) >> 8; \ 644 frm += 2; \ 645} while (0) 646#define ADDSELECTOR(frm, sel) do { \ 647 memcpy(frm, sel, 4); \ 648 frm += 4; \ 649} while (0) 650 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 651 static const u_int8_t cipher_suite[][4] = { 652 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 653 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 654 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 655 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 656 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 657 { WPA_OUI_BYTES, WPA_CSE_NULL }, 658 }; 659 static const u_int8_t wep104_suite[4] = 660 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 661 static const u_int8_t key_mgt_unspec[4] = 662 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 663 static const u_int8_t key_mgt_psk[4] = 664 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 665 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 666 u_int8_t *frm = ie; 667 u_int8_t *selcnt; 668 669 *frm++ = IEEE80211_ELEMID_VENDOR; 670 *frm++ = 0; /* length filled in below */ 671 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 672 frm += sizeof(oui); 673 ADDSHORT(frm, WPA_VERSION); 674 675 /* XXX filter out CKIP */ 676 677 /* multicast cipher */ 678 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 679 rsn->rsn_mcastkeylen >= 13) 680 ADDSELECTOR(frm, wep104_suite); 681 else 682 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 683 684 /* unicast cipher list */ 685 selcnt = frm; 686 ADDSHORT(frm, 0); /* selector count */ 687 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 688 selcnt[0]++; 689 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 690 } 691 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 692 selcnt[0]++; 693 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 694 } 695 696 /* authenticator selector list */ 697 selcnt = frm; 698 ADDSHORT(frm, 0); /* selector count */ 699 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 700 selcnt[0]++; 701 ADDSELECTOR(frm, key_mgt_unspec); 702 } 703 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 704 selcnt[0]++; 705 ADDSELECTOR(frm, key_mgt_psk); 706 } 707 708 /* optional capabilities */ 709 if (rsn->rsn_caps != 0) 710 ADDSHORT(frm, rsn->rsn_caps); 711 712 /* calculate element length */ 713 ie[1] = frm - ie - 2; 714 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 715 ("WPA IE too big, %u > %zu", 716 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 717 return frm; 718#undef ADDSHORT 719#undef ADDSELECTOR 720#undef WPA_OUI_BYTES 721} 722 723static u_int8_t * 724ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 725{ 726#define RSN_OUI_BYTES 0x00, 0x0f, 0xac 727#define ADDSHORT(frm, v) do { \ 728 frm[0] = (v) & 0xff; \ 729 frm[1] = (v) >> 8; \ 730 frm += 2; \ 731} while (0) 732#define ADDSELECTOR(frm, sel) do { \ 733 memcpy(frm, sel, 4); \ 734 frm += 4; \ 735} while (0) 736 static const u_int8_t cipher_suite[][4] = { 737 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 738 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 739 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 740 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 741 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 742 { RSN_OUI_BYTES, RSN_CSE_NULL }, 743 }; 744 static const u_int8_t wep104_suite[4] = 745 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 746 static const u_int8_t key_mgt_unspec[4] = 747 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 748 static const u_int8_t key_mgt_psk[4] = 749 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 750 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 751 u_int8_t *frm = ie; 752 u_int8_t *selcnt; 753 754 *frm++ = IEEE80211_ELEMID_RSN; 755 *frm++ = 0; /* length filled in below */ 756 ADDSHORT(frm, RSN_VERSION); 757 758 /* XXX filter out CKIP */ 759 760 /* multicast cipher */ 761 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 762 rsn->rsn_mcastkeylen >= 13) 763 ADDSELECTOR(frm, wep104_suite); 764 else 765 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 766 767 /* unicast cipher list */ 768 selcnt = frm; 769 ADDSHORT(frm, 0); /* selector count */ 770 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 771 selcnt[0]++; 772 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 773 } 774 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 775 selcnt[0]++; 776 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 777 } 778 779 /* authenticator selector list */ 780 selcnt = frm; 781 ADDSHORT(frm, 0); /* selector count */ 782 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 783 selcnt[0]++; 784 ADDSELECTOR(frm, key_mgt_unspec); 785 } 786 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 787 selcnt[0]++; 788 ADDSELECTOR(frm, key_mgt_psk); 789 } 790 791 /* optional capabilities */ 792 if (rsn->rsn_caps != 0) 793 ADDSHORT(frm, rsn->rsn_caps); 794 /* XXX PMKID */ 795 796 /* calculate element length */ 797 ie[1] = frm - ie - 2; 798 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 799 ("RSN IE too big, %u > %zu", 800 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 801 return frm; 802#undef ADDSELECTOR 803#undef ADDSHORT 804#undef RSN_OUI_BYTES 805} 806 807/* 808 * Add a WPA/RSN element to a frame. 809 */ 810static u_int8_t * 811ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 812{ 813 814 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 815 if (ic->ic_flags & IEEE80211_F_WPA2) 816 frm = ieee80211_setup_rsn_ie(ic, frm); 817 if (ic->ic_flags & IEEE80211_F_WPA1) 818 frm = ieee80211_setup_wpa_ie(ic, frm); 819 return frm; 820} 821 822#define WME_OUI_BYTES 0x00, 0x50, 0xf2 823/* 824 * Add a WME information element to a frame. 825 */ 826static u_int8_t * 827ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 828{ 829 static const struct ieee80211_wme_info info = { 830 .wme_id = IEEE80211_ELEMID_VENDOR, 831 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 832 .wme_oui = { WME_OUI_BYTES }, 833 .wme_type = WME_OUI_TYPE, 834 .wme_subtype = WME_INFO_OUI_SUBTYPE, 835 .wme_version = WME_VERSION, 836 .wme_info = 0, 837 }; 838 memcpy(frm, &info, sizeof(info)); 839 return frm + sizeof(info); 840} 841 842/* 843 * Add a WME parameters element to a frame. 844 */ 845static u_int8_t * 846ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 847{ 848#define SM(_v, _f) (((_v) << _f##_S) & _f) 849#define ADDSHORT(frm, v) do { \ 850 frm[0] = (v) & 0xff; \ 851 frm[1] = (v) >> 8; \ 852 frm += 2; \ 853} while (0) 854 /* NB: this works 'cuz a param has an info at the front */ 855 static const struct ieee80211_wme_info param = { 856 .wme_id = IEEE80211_ELEMID_VENDOR, 857 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 858 .wme_oui = { WME_OUI_BYTES }, 859 .wme_type = WME_OUI_TYPE, 860 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 861 .wme_version = WME_VERSION, 862 }; 863 int i; 864 865 memcpy(frm, ¶m, sizeof(param)); 866 frm += __offsetof(struct ieee80211_wme_info, wme_info); 867 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 868 *frm++ = 0; /* reserved field */ 869 for (i = 0; i < WME_NUM_AC; i++) { 870 const struct wmeParams *ac = 871 &wme->wme_bssChanParams.cap_wmeParams[i]; 872 *frm++ = SM(i, WME_PARAM_ACI) 873 | SM(ac->wmep_acm, WME_PARAM_ACM) 874 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 875 ; 876 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 877 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 878 ; 879 ADDSHORT(frm, ac->wmep_txopLimit); 880 } 881 return frm; 882#undef SM 883#undef ADDSHORT 884} 885#undef WME_OUI_BYTES 886 887/* 888 * Send a management frame. The node is for the destination (or ic_bss 889 * when in station mode). Nodes other than ic_bss have their reference 890 * count bumped to reflect our use for an indeterminant time. 891 */ 892int 893ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 894 int type, int arg) 895{ 896#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 897 struct mbuf *m; 898 u_int8_t *frm; 899 enum ieee80211_phymode mode; 900 u_int16_t capinfo; 901 int has_challenge, is_shared_key, ret, timer, status; 902 903 KASSERT(ni != NULL, ("null node")); 904 905 /* 906 * Hold a reference on the node so it doesn't go away until after 907 * the xmit is complete all the way in the driver. On error we 908 * will remove our reference. 909 */ 910 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 911 "ieee80211_ref_node (%s:%u) %s refcnt %d\n", 912 __func__, __LINE__, 913 ether_sprintf(ni->ni_macaddr), 914 ieee80211_node_refcnt(ni)+1); 915 ieee80211_ref_node(ni); 916 917 timer = 0; 918 switch (type) { 919 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 920 /* 921 * prreq frame format 922 * [tlv] ssid 923 * [tlv] supported rates 924 * [tlv] extended supported rates 925 * [tlv] WME (optional) 926 * [tlv] user-specified ie's 927 */ 928 m = ieee80211_getmgtframe(&frm, 929 2 + IEEE80211_NWID_LEN 930 + 2 + IEEE80211_RATE_SIZE 931 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 932 + sizeof(struct ieee80211_wme_param) 933 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 934 ); 935 if (m == NULL) 936 senderr(ENOMEM, is_tx_nobuf); 937 938 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 939 mode = ieee80211_chan2mode(ic, ni->ni_chan); 940 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 941 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 942 if (ic->ic_flags & IEEE80211_F_WME) 943 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 944 if (ic->ic_opt_ie != NULL) { 945 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 946 frm += ic->ic_opt_ie_len; 947 } 948 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 949 950 IEEE80211_NODE_STAT(ni, tx_probereq); 951 if (ic->ic_opmode == IEEE80211_M_STA) 952 timer = IEEE80211_TRANS_WAIT; 953 break; 954 955 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 956 /* 957 * probe response frame format 958 * [8] time stamp 959 * [2] beacon interval 960 * [2] cabability information 961 * [tlv] ssid 962 * [tlv] supported rates 963 * [tlv] parameter set (FH/DS) 964 * [tlv] parameter set (IBSS) 965 * [tlv] extended rate phy (ERP) 966 * [tlv] extended supported rates 967 * [tlv] WPA 968 */ 969 m = ieee80211_getmgtframe(&frm, 970 8 971 + sizeof(u_int16_t) 972 + sizeof(u_int16_t) 973 + 2 + IEEE80211_NWID_LEN 974 + 2 + IEEE80211_RATE_SIZE 975 + 7 /* max(7,3) */ 976 + 6 977 + 3 978 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 979 /* XXX !WPA1+WPA2 fits w/o a cluster */ 980 + (ic->ic_flags & IEEE80211_F_WPA ? 981 2*sizeof(struct ieee80211_ie_wpa) : 0) 982 ); 983 if (m == NULL) 984 senderr(ENOMEM, is_tx_nobuf); 985 986 memset(frm, 0, 8); /* timestamp should be filled later */ 987 frm += 8; 988 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 989 frm += 2; 990 if (ic->ic_opmode == IEEE80211_M_IBSS) 991 capinfo = IEEE80211_CAPINFO_IBSS; 992 else 993 capinfo = IEEE80211_CAPINFO_ESS; 994 if (ic->ic_flags & IEEE80211_F_PRIVACY) 995 capinfo |= IEEE80211_CAPINFO_PRIVACY; 996 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 997 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 998 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 999 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1000 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1001 *(u_int16_t *)frm = htole16(capinfo); 1002 frm += 2; 1003 1004 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1005 ic->ic_bss->ni_esslen); 1006 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1007 1008 if (ic->ic_phytype == IEEE80211_T_FH) { 1009 *frm++ = IEEE80211_ELEMID_FHPARMS; 1010 *frm++ = 5; 1011 *frm++ = ni->ni_fhdwell & 0x00ff; 1012 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1013 *frm++ = IEEE80211_FH_CHANSET( 1014 ieee80211_chan2ieee(ic, ni->ni_chan)); 1015 *frm++ = IEEE80211_FH_CHANPAT( 1016 ieee80211_chan2ieee(ic, ni->ni_chan)); 1017 *frm++ = ni->ni_fhindex; 1018 } else { 1019 *frm++ = IEEE80211_ELEMID_DSPARMS; 1020 *frm++ = 1; 1021 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1022 } 1023 1024 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1025 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1026 *frm++ = 2; 1027 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1028 } 1029 if (ic->ic_flags & IEEE80211_F_WPA) 1030 frm = ieee80211_add_wpa(frm, ic); 1031 if (ic->ic_curmode == IEEE80211_MODE_11G) 1032 frm = ieee80211_add_erp(frm, ic); 1033 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1034 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1035 break; 1036 1037 case IEEE80211_FC0_SUBTYPE_AUTH: 1038 status = arg >> 16; 1039 arg &= 0xffff; 1040 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1041 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1042 ni->ni_challenge != NULL); 1043 1044 /* 1045 * Deduce whether we're doing open authentication or 1046 * shared key authentication. We do the latter if 1047 * we're in the middle of a shared key authentication 1048 * handshake or if we're initiating an authentication 1049 * request and configured to use shared key. 1050 */ 1051 is_shared_key = has_challenge || 1052 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1053 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1054 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1055 1056 m = ieee80211_getmgtframe(&frm, 1057 3 * sizeof(u_int16_t) 1058 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1059 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1060 ); 1061 if (m == NULL) 1062 senderr(ENOMEM, is_tx_nobuf); 1063 1064 ((u_int16_t *)frm)[0] = 1065 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1066 : htole16(IEEE80211_AUTH_ALG_OPEN); 1067 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1068 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1069 1070 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1071 ((u_int16_t *)frm)[3] = 1072 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1073 IEEE80211_ELEMID_CHALLENGE); 1074 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1075 IEEE80211_CHALLENGE_LEN); 1076 m->m_pkthdr.len = m->m_len = 1077 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1078 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1079 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1080 "[%s] request encrypt frame (%s)\n", 1081 ether_sprintf(ni->ni_macaddr), __func__); 1082 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1083 } 1084 } else 1085 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1086 1087 /* XXX not right for shared key */ 1088 if (status == IEEE80211_STATUS_SUCCESS) 1089 IEEE80211_NODE_STAT(ni, tx_auth); 1090 else 1091 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1092 1093 /* 1094 * When 802.1x is not in use mark the port 1095 * authorized at this point so traffic can flow. 1096 */ 1097 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1098 status == IEEE80211_STATUS_SUCCESS && 1099 ni->ni_authmode != IEEE80211_AUTH_8021X) 1100 ieee80211_node_authorize(ic, ni); 1101 if (ic->ic_opmode == IEEE80211_M_STA) 1102 timer = IEEE80211_TRANS_WAIT; 1103 break; 1104 1105 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1106 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1107 "[%s] send station deauthenticate (reason %d)\n", 1108 ether_sprintf(ni->ni_macaddr), arg); 1109 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1110 if (m == NULL) 1111 senderr(ENOMEM, is_tx_nobuf); 1112 *(u_int16_t *)frm = htole16(arg); /* reason */ 1113 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1114 1115 IEEE80211_NODE_STAT(ni, tx_deauth); 1116 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1117 1118 ieee80211_node_unauthorize(ic, ni); /* port closed */ 1119 break; 1120 1121 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1122 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1123 /* 1124 * asreq frame format 1125 * [2] capability information 1126 * [2] listen interval 1127 * [6*] current AP address (reassoc only) 1128 * [tlv] ssid 1129 * [tlv] supported rates 1130 * [tlv] extended supported rates 1131 * [tlv] WME 1132 * [tlv] user-specified ie's 1133 */ 1134 m = ieee80211_getmgtframe(&frm, 1135 sizeof(u_int16_t) 1136 + sizeof(u_int16_t) 1137 + IEEE80211_ADDR_LEN 1138 + 2 + IEEE80211_NWID_LEN 1139 + 2 + IEEE80211_RATE_SIZE 1140 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1141 + sizeof(struct ieee80211_wme_info) 1142 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1143 ); 1144 if (m == NULL) 1145 senderr(ENOMEM, is_tx_nobuf); 1146 1147 capinfo = 0; 1148 if (ic->ic_opmode == IEEE80211_M_IBSS) 1149 capinfo |= IEEE80211_CAPINFO_IBSS; 1150 else /* IEEE80211_M_STA */ 1151 capinfo |= IEEE80211_CAPINFO_ESS; 1152 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1153 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1154 /* 1155 * NB: Some 11a AP's reject the request when 1156 * short premable is set. 1157 */ 1158 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1159 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1160 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1161 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1162 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1163 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1164 *(u_int16_t *)frm = htole16(capinfo); 1165 frm += 2; 1166 1167 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1168 frm += 2; 1169 1170 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1171 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1172 frm += IEEE80211_ADDR_LEN; 1173 } 1174 1175 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1176 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1177 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1178 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1179 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1180 if (ic->ic_opt_ie != NULL) { 1181 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1182 frm += ic->ic_opt_ie_len; 1183 } 1184 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1185 1186 timer = IEEE80211_TRANS_WAIT; 1187 break; 1188 1189 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1190 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1191 /* 1192 * asreq frame format 1193 * [2] capability information 1194 * [2] status 1195 * [2] association ID 1196 * [tlv] supported rates 1197 * [tlv] extended supported rates 1198 * [tlv] WME (if enabled and STA enabled) 1199 */ 1200 m = ieee80211_getmgtframe(&frm, 1201 sizeof(u_int16_t) 1202 + sizeof(u_int16_t) 1203 + sizeof(u_int16_t) 1204 + 2 + IEEE80211_RATE_SIZE 1205 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1206 + sizeof(struct ieee80211_wme_param) 1207 ); 1208 if (m == NULL) 1209 senderr(ENOMEM, is_tx_nobuf); 1210 1211 capinfo = IEEE80211_CAPINFO_ESS; 1212 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1213 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1214 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1215 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1216 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1217 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1218 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1219 *(u_int16_t *)frm = htole16(capinfo); 1220 frm += 2; 1221 1222 *(u_int16_t *)frm = htole16(arg); /* status */ 1223 frm += 2; 1224 1225 if (arg == IEEE80211_STATUS_SUCCESS) { 1226 *(u_int16_t *)frm = htole16(ni->ni_associd); 1227 IEEE80211_NODE_STAT(ni, tx_assoc); 1228 } else 1229 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1230 frm += 2; 1231 1232 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1233 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1234 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1235 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1236 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1237 break; 1238 1239 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1240 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1241 "[%s] send station disassociate (reason %d)\n", 1242 ether_sprintf(ni->ni_macaddr), arg); 1243 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1244 if (m == NULL) 1245 senderr(ENOMEM, is_tx_nobuf); 1246 *(u_int16_t *)frm = htole16(arg); /* reason */ 1247 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1248 1249 IEEE80211_NODE_STAT(ni, tx_disassoc); 1250 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1251 break; 1252 1253 default: 1254 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1255 "[%s] invalid mgmt frame type %u\n", 1256 ether_sprintf(ni->ni_macaddr), type); 1257 senderr(EINVAL, is_tx_unknownmgt); 1258 /* NOTREACHED */ 1259 } 1260 1261 ret = ieee80211_mgmt_output(ic, ni, m, type); 1262 if (ret == 0) { 1263 if (timer) 1264 ic->ic_mgt_timer = timer; 1265 } else { 1266bad: 1267 ieee80211_free_node(ni); 1268 } 1269 return ret; 1270#undef senderr 1271} 1272 1273/* 1274 * Allocate a beacon frame and fillin the appropriate bits. 1275 */ 1276struct mbuf * 1277ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1278 struct ieee80211_beacon_offsets *bo) 1279{ 1280 struct ifnet *ifp = ic->ic_ifp; 1281 struct ieee80211_frame *wh; 1282 struct mbuf *m; 1283 int pktlen; 1284 u_int8_t *frm, *efrm; 1285 u_int16_t capinfo; 1286 struct ieee80211_rateset *rs; 1287 1288 /* 1289 * beacon frame format 1290 * [8] time stamp 1291 * [2] beacon interval 1292 * [2] cabability information 1293 * [tlv] ssid 1294 * [tlv] supported rates 1295 * [3] parameter set (DS) 1296 * [tlv] parameter set (IBSS/TIM) 1297 * [tlv] extended rate phy (ERP) 1298 * [tlv] extended supported rates 1299 * [tlv] WME parameters 1300 * [tlv] WPA/RSN parameters 1301 * XXX Vendor-specific OIDs (e.g. Atheros) 1302 * NB: we allocate the max space required for the TIM bitmap. 1303 */ 1304 rs = &ni->ni_rates; 1305 pktlen = 8 /* time stamp */ 1306 + sizeof(u_int16_t) /* beacon interval */ 1307 + sizeof(u_int16_t) /* capabilities */ 1308 + 2 + ni->ni_esslen /* ssid */ 1309 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1310 + 2 + 1 /* DS parameters */ 1311 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1312 + 2 + 1 /* ERP */ 1313 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1314 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1315 sizeof(struct ieee80211_wme_param) : 0) 1316 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1317 2*sizeof(struct ieee80211_ie_wpa) : 0) 1318 ; 1319 m = ieee80211_getmgtframe(&frm, pktlen); 1320 if (m == NULL) { 1321 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1322 "%s: cannot get buf; size %u\n", __func__, pktlen); 1323 ic->ic_stats.is_tx_nobuf++; 1324 return NULL; 1325 } 1326 1327 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1328 frm += 8; 1329 *(u_int16_t *)frm = htole16(ni->ni_intval); 1330 frm += 2; 1331 if (ic->ic_opmode == IEEE80211_M_IBSS) 1332 capinfo = IEEE80211_CAPINFO_IBSS; 1333 else 1334 capinfo = IEEE80211_CAPINFO_ESS; 1335 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1336 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1337 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1338 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1339 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1340 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1341 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1342 bo->bo_caps = (u_int16_t *)frm; 1343 *(u_int16_t *)frm = htole16(capinfo); 1344 frm += 2; 1345 *frm++ = IEEE80211_ELEMID_SSID; 1346 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1347 *frm++ = ni->ni_esslen; 1348 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1349 frm += ni->ni_esslen; 1350 } else 1351 *frm++ = 0; 1352 frm = ieee80211_add_rates(frm, rs); 1353 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1354 *frm++ = IEEE80211_ELEMID_DSPARMS; 1355 *frm++ = 1; 1356 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1357 } 1358 bo->bo_tim = frm; 1359 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1360 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1361 *frm++ = 2; 1362 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1363 bo->bo_tim_len = 0; 1364 } else { 1365 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1366 1367 tie->tim_ie = IEEE80211_ELEMID_TIM; 1368 tie->tim_len = 4; /* length */ 1369 tie->tim_count = 0; /* DTIM count */ 1370 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1371 tie->tim_bitctl = 0; /* bitmap control */ 1372 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1373 frm += sizeof(struct ieee80211_tim_ie); 1374 bo->bo_tim_len = 1; 1375 } 1376 bo->bo_trailer = frm; 1377 if (ic->ic_flags & IEEE80211_F_WME) { 1378 bo->bo_wme = frm; 1379 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1380 } 1381 if (ic->ic_flags & IEEE80211_F_WPA) 1382 frm = ieee80211_add_wpa(frm, ic); 1383 if (ic->ic_curmode == IEEE80211_MODE_11G) 1384 frm = ieee80211_add_erp(frm, ic); 1385 efrm = ieee80211_add_xrates(frm, rs); 1386 bo->bo_trailer_len = efrm - bo->bo_trailer; 1387 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1388 1389 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1390 KASSERT(m != NULL, ("no space for 802.11 header?")); 1391 wh = mtod(m, struct ieee80211_frame *); 1392 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1393 IEEE80211_FC0_SUBTYPE_BEACON; 1394 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1395 *(u_int16_t *)wh->i_dur = 0; 1396 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1397 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1398 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1399 *(u_int16_t *)wh->i_seq = 0; 1400 1401 return m; 1402} 1403 1404/* 1405 * Update the dynamic parts of a beacon frame based on the current state. 1406 */ 1407int 1408ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1409 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1410{ 1411 int len_changed = 0; 1412 u_int16_t capinfo; 1413 1414 IEEE80211_BEACON_LOCK(ic); 1415 /* XXX faster to recalculate entirely or just changes? */ 1416 if (ic->ic_opmode == IEEE80211_M_IBSS) 1417 capinfo = IEEE80211_CAPINFO_IBSS; 1418 else 1419 capinfo = IEEE80211_CAPINFO_ESS; 1420 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1421 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1422 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1423 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1424 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1425 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1426 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1427 *bo->bo_caps = htole16(capinfo); 1428 1429 if (ic->ic_flags & IEEE80211_F_WME) { 1430 struct ieee80211_wme_state *wme = &ic->ic_wme; 1431 1432 /* 1433 * Check for agressive mode change. When there is 1434 * significant high priority traffic in the BSS 1435 * throttle back BE traffic by using conservative 1436 * parameters. Otherwise BE uses agressive params 1437 * to optimize performance of legacy/non-QoS traffic. 1438 */ 1439 if (wme->wme_flags & WME_F_AGGRMODE) { 1440 if (wme->wme_hipri_traffic > 1441 wme->wme_hipri_switch_thresh) { 1442 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1443 "%s: traffic %u, disable aggressive mode\n", 1444 __func__, wme->wme_hipri_traffic); 1445 wme->wme_flags &= ~WME_F_AGGRMODE; 1446 ieee80211_wme_updateparams_locked(ic); 1447 wme->wme_hipri_traffic = 1448 wme->wme_hipri_switch_hysteresis; 1449 } else 1450 wme->wme_hipri_traffic = 0; 1451 } else { 1452 if (wme->wme_hipri_traffic <= 1453 wme->wme_hipri_switch_thresh) { 1454 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1455 "%s: traffic %u, enable aggressive mode\n", 1456 __func__, wme->wme_hipri_traffic); 1457 wme->wme_flags |= WME_F_AGGRMODE; 1458 ieee80211_wme_updateparams_locked(ic); 1459 wme->wme_hipri_traffic = 0; 1460 } else 1461 wme->wme_hipri_traffic = 1462 wme->wme_hipri_switch_hysteresis; 1463 } 1464 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1465 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1466 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1467 } 1468 } 1469 1470 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1471 struct ieee80211_tim_ie *tie = 1472 (struct ieee80211_tim_ie *) bo->bo_tim; 1473 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1474 u_int timlen, timoff, i; 1475 /* 1476 * ATIM/DTIM needs updating. If it fits in the 1477 * current space allocated then just copy in the 1478 * new bits. Otherwise we need to move any trailing 1479 * data to make room. Note that we know there is 1480 * contiguous space because ieee80211_beacon_allocate 1481 * insures there is space in the mbuf to write a 1482 * maximal-size virtual bitmap (based on ic_max_aid). 1483 */ 1484 /* 1485 * Calculate the bitmap size and offset, copy any 1486 * trailer out of the way, and then copy in the 1487 * new bitmap and update the information element. 1488 * Note that the tim bitmap must contain at least 1489 * one byte and any offset must be even. 1490 */ 1491 if (ic->ic_ps_pending != 0) { 1492 timoff = 128; /* impossibly large */ 1493 for (i = 0; i < ic->ic_tim_len; i++) 1494 if (ic->ic_tim_bitmap[i]) { 1495 timoff = i &~ 1; 1496 break; 1497 } 1498 KASSERT(timoff != 128, ("tim bitmap empty!")); 1499 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1500 if (ic->ic_tim_bitmap[i]) 1501 break; 1502 timlen = 1 + (i - timoff); 1503 } else { 1504 timoff = 0; 1505 timlen = 1; 1506 } 1507 if (timlen != bo->bo_tim_len) { 1508 /* copy up/down trailer */ 1509 ovbcopy(bo->bo_trailer, tie->tim_bitmap+timlen, 1510 bo->bo_trailer_len); 1511 bo->bo_trailer = tie->tim_bitmap+timlen; 1512 bo->bo_wme = bo->bo_trailer; 1513 bo->bo_tim_len = timlen; 1514 1515 /* update information element */ 1516 tie->tim_len = 3 + timlen; 1517 tie->tim_bitctl = timoff; 1518 len_changed = 1; 1519 } 1520 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1521 bo->bo_tim_len); 1522 1523 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1524 1525 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1526 "%s: TIM updated, pending %u, off %u, len %u\n", 1527 __func__, ic->ic_ps_pending, timoff, timlen); 1528 } 1529 /* count down DTIM period */ 1530 if (tie->tim_count == 0) 1531 tie->tim_count = tie->tim_period - 1; 1532 else 1533 tie->tim_count--; 1534 /* update state for buffered multicast frames on DTIM */ 1535 if (mcast && (tie->tim_count == 1 || tie->tim_period == 1)) 1536 tie->tim_bitctl |= 1; 1537 else 1538 tie->tim_bitctl &= ~1; 1539 } 1540 IEEE80211_BEACON_UNLOCK(ic); 1541 1542 return len_changed; 1543} 1544 1545/* 1546 * Save an outbound packet for a node in power-save sleep state. 1547 * The new packet is placed on the node's saved queue, and the TIM 1548 * is changed, if necessary. 1549 */ 1550void 1551ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1552 struct mbuf *m) 1553{ 1554 int qlen, age; 1555 1556 IEEE80211_NODE_SAVEQ_LOCK(ni); 1557 if (_IF_QFULL(&ni->ni_savedq)) { 1558 _IF_DROP(&ni->ni_savedq); 1559 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1560 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1561 "[%s] pwr save q overflow, drops %d (size %d)\n", 1562 ether_sprintf(ni->ni_macaddr), 1563 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1564#ifdef IEEE80211_DEBUG 1565 if (ieee80211_msg_dumppkts(ic)) 1566 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1567#endif 1568 m_freem(m); 1569 return; 1570 } 1571 /* 1572 * Tag the frame with it's expiry time and insert 1573 * it in the queue. The aging interval is 4 times 1574 * the listen interval specified by the station. 1575 * Frames that sit around too long are reclaimed 1576 * using this information. 1577 */ 1578 /* XXX handle overflow? */ 1579 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */ 1580 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1581 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1582 1583 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1584 "[%s] save frame, %u now queued\n", 1585 ether_sprintf(ni->ni_macaddr), qlen); 1586 1587 if (qlen == 1) 1588 ic->ic_set_tim(ic, ni, 1); 1589} 1590