ieee80211_output.c revision 148582
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 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 148582 2005-07-31 06:12:32Z 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 * Set the direction field and address fields of an outgoing 82 * non-QoS frame. Note this should be called early on in 83 * constructing a frame as it sets i_fc[1]; other bits can 84 * then be or'd in. 85 */ 86static void 87ieee80211_send_setup(struct ieee80211com *ic, 88 struct ieee80211_node *ni, 89 struct ieee80211_frame *wh, 90 int type, 91 const u_int8_t sa[IEEE80211_ADDR_LEN], 92 const u_int8_t da[IEEE80211_ADDR_LEN], 93 const u_int8_t bssid[IEEE80211_ADDR_LEN]) 94{ 95#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 96 97 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 98 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 99 switch (ic->ic_opmode) { 100 case IEEE80211_M_STA: 101 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 102 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 103 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 104 IEEE80211_ADDR_COPY(wh->i_addr3, da); 105 break; 106 case IEEE80211_M_IBSS: 107 case IEEE80211_M_AHDEMO: 108 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 109 IEEE80211_ADDR_COPY(wh->i_addr1, da); 110 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 111 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 112 break; 113 case IEEE80211_M_HOSTAP: 114 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 115 IEEE80211_ADDR_COPY(wh->i_addr1, da); 116 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 117 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 118 break; 119 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 120 break; 121 } 122 } else { 123 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 124 IEEE80211_ADDR_COPY(wh->i_addr1, da); 125 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 126 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 127 } 128 *(u_int16_t *)&wh->i_dur[0] = 0; 129 /* NB: use non-QoS tid */ 130 *(u_int16_t *)&wh->i_seq[0] = 131 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 132 ni->ni_txseqs[0]++; 133#undef WH4 134} 135 136/* 137 * Send a management frame to the specified node. The node pointer 138 * must have a reference as the pointer will be passed to the driver 139 * and potentially held for a long time. If the frame is successfully 140 * dispatched to the driver, then it is responsible for freeing the 141 * reference (and potentially free'ing up any associated storage). 142 */ 143static int 144ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 145 struct mbuf *m, int type) 146{ 147 struct ifnet *ifp = ic->ic_ifp; 148 struct ieee80211_frame *wh; 149 150 KASSERT(ni != NULL, ("null node")); 151 152 /* 153 * Yech, hack alert! We want to pass the node down to the 154 * driver's start routine. If we don't do so then the start 155 * routine must immediately look it up again and that can 156 * cause a lock order reversal if, for example, this frame 157 * is being sent because the station is being timedout and 158 * the frame being sent is a DEAUTH message. We could stick 159 * this in an m_tag and tack that on to the mbuf. However 160 * that's rather expensive to do for every frame so instead 161 * we stuff it in the rcvif field since outbound frames do 162 * not (presently) use this. 163 */ 164 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 165 if (m == NULL) 166 return ENOMEM; 167 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 168 m->m_pkthdr.rcvif = (void *)ni; 169 170 wh = mtod(m, struct ieee80211_frame *); 171 ieee80211_send_setup(ic, ni, wh, 172 IEEE80211_FC0_TYPE_MGT | type, 173 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 174 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 175 m->m_flags &= ~M_LINK0; 176 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 177 "[%s] encrypting frame (%s)\n", 178 ether_sprintf(wh->i_addr1), __func__); 179 wh->i_fc[1] |= IEEE80211_FC1_WEP; 180 } 181#ifdef IEEE80211_DEBUG 182 /* avoid printing too many frames */ 183 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 184 ieee80211_msg_dumppkts(ic)) { 185 printf("[%s] send %s on channel %u\n", 186 ether_sprintf(wh->i_addr1), 187 ieee80211_mgt_subtype_name[ 188 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 189 IEEE80211_FC0_SUBTYPE_SHIFT], 190 ieee80211_chan2ieee(ic, ni->ni_chan)); 191 } 192#endif 193 IEEE80211_NODE_STAT(ni, tx_mgmt); 194 IF_ENQUEUE(&ic->ic_mgtq, m); 195 ifp->if_timer = 1; 196 if_start(ifp); 197 return 0; 198} 199 200/* 201 * Send a null data frame to the specified node. 202 * 203 * NB: the caller is assumed to have setup a node reference 204 * for use; this is necessary to deal with a race condition 205 * when probing for inactive stations. 206 */ 207int 208ieee80211_send_nulldata(struct ieee80211_node *ni) 209{ 210 struct ieee80211com *ic = ni->ni_ic; 211 struct ifnet *ifp = ic->ic_ifp; 212 struct mbuf *m; 213 struct ieee80211_frame *wh; 214 215 MGETHDR(m, M_NOWAIT, MT_HEADER); 216 if (m == NULL) { 217 /* XXX debug msg */ 218 ic->ic_stats.is_tx_nobuf++; 219 ieee80211_unref_node(&ni); 220 return ENOMEM; 221 } 222 m->m_pkthdr.rcvif = (void *) ni; 223 224 wh = mtod(m, struct ieee80211_frame *); 225 ieee80211_send_setup(ic, ni, wh, 226 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 227 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 228 /* NB: power management bit is never sent by an AP */ 229 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 230 ic->ic_opmode != IEEE80211_M_HOSTAP) 231 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 232 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 233 234 IEEE80211_NODE_STAT(ni, tx_data); 235 236 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 237 "[%s] send null data frame on channel %u, pwr mgt %s\n", 238 ether_sprintf(ni->ni_macaddr), 239 ieee80211_chan2ieee(ic, ni->ni_chan), 240 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 241 242 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 243 if_start(ifp); 244 245 return 0; 246} 247 248/* 249 * Assign priority to a frame based on any vlan tag assigned 250 * to the station and/or any Diffserv setting in an IP header. 251 * Finally, if an ACM policy is setup (in station mode) it's 252 * applied. 253 */ 254int 255ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 256{ 257 int v_wme_ac, d_wme_ac, ac; 258#ifdef INET 259 struct ether_header *eh; 260#endif 261 262 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 263 ac = WME_AC_BE; 264 goto done; 265 } 266 267 /* 268 * If node has a vlan tag then all traffic 269 * to it must have a matching tag. 270 */ 271 v_wme_ac = 0; 272 if (ni->ni_vlan != 0) { 273 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m); 274 if (mtag == NULL) { 275 IEEE80211_NODE_STAT(ni, tx_novlantag); 276 return 1; 277 } 278 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 279 EVL_VLANOFTAG(ni->ni_vlan)) { 280 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 281 return 1; 282 } 283 /* map vlan priority to AC */ 284 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 285 case 1: 286 case 2: 287 v_wme_ac = WME_AC_BK; 288 break; 289 case 0: 290 case 3: 291 v_wme_ac = WME_AC_BE; 292 break; 293 case 4: 294 case 5: 295 v_wme_ac = WME_AC_VI; 296 break; 297 case 6: 298 case 7: 299 v_wme_ac = WME_AC_VO; 300 break; 301 } 302 } 303 304#ifdef INET 305 eh = mtod(m, struct ether_header *); 306 if (eh->ether_type == htons(ETHERTYPE_IP)) { 307 const struct ip *ip = (struct ip *) 308 (mtod(m, u_int8_t *) + sizeof (*eh)); 309 /* 310 * IP frame, map the TOS field. 311 */ 312 switch (ip->ip_tos) { 313 case 0x08: 314 case 0x20: 315 d_wme_ac = WME_AC_BK; /* background */ 316 break; 317 case 0x28: 318 case 0xa0: 319 d_wme_ac = WME_AC_VI; /* video */ 320 break; 321 case 0x30: /* voice */ 322 case 0xe0: 323 case 0x88: /* XXX UPSD */ 324 case 0xb8: 325 d_wme_ac = WME_AC_VO; 326 break; 327 default: 328 d_wme_ac = WME_AC_BE; 329 break; 330 } 331 } else { 332#endif /* INET */ 333 d_wme_ac = WME_AC_BE; 334#ifdef INET 335 } 336#endif 337 /* 338 * Use highest priority AC. 339 */ 340 if (v_wme_ac > d_wme_ac) 341 ac = v_wme_ac; 342 else 343 ac = d_wme_ac; 344 345 /* 346 * Apply ACM policy. 347 */ 348 if (ic->ic_opmode == IEEE80211_M_STA) { 349 static const int acmap[4] = { 350 WME_AC_BK, /* WME_AC_BE */ 351 WME_AC_BK, /* WME_AC_BK */ 352 WME_AC_BE, /* WME_AC_VI */ 353 WME_AC_VI, /* WME_AC_VO */ 354 }; 355 while (ac != WME_AC_BK && 356 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 357 ac = acmap[ac]; 358 } 359done: 360 M_WME_SETAC(m, ac); 361 return 0; 362} 363 364/* 365 * Insure there is sufficient contiguous space to encapsulate the 366 * 802.11 data frame. If room isn't already there, arrange for it. 367 * Drivers and cipher modules assume we have done the necessary work 368 * and fail rudely if they don't find the space they need. 369 */ 370static struct mbuf * 371ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 372 struct ieee80211_key *key, struct mbuf *m) 373{ 374#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 375 int needed_space = hdrsize; 376 377 if (key != NULL) { 378 /* XXX belongs in crypto code? */ 379 needed_space += key->wk_cipher->ic_header; 380 /* XXX frags */ 381 } 382 /* 383 * We know we are called just before stripping an Ethernet 384 * header and prepending an LLC header. This means we know 385 * there will be 386 * sizeof(struct ether_header) - sizeof(struct llc) 387 * bytes recovered to which we need additional space for the 388 * 802.11 header and any crypto header. 389 */ 390 /* XXX check trailing space and copy instead? */ 391 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 392 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 393 if (n == NULL) { 394 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 395 "%s: cannot expand storage\n", __func__); 396 ic->ic_stats.is_tx_nobuf++; 397 m_freem(m); 398 return NULL; 399 } 400 KASSERT(needed_space <= MHLEN, 401 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 402 /* 403 * Setup new mbuf to have leading space to prepend the 404 * 802.11 header and any crypto header bits that are 405 * required (the latter are added when the driver calls 406 * back to ieee80211_crypto_encap to do crypto encapsulation). 407 */ 408 /* NB: must be first 'cuz it clobbers m_data */ 409 m_move_pkthdr(n, m); 410 n->m_len = 0; /* NB: m_gethdr does not set */ 411 n->m_data += needed_space; 412 /* 413 * Pull up Ethernet header to create the expected layout. 414 * We could use m_pullup but that's overkill (i.e. we don't 415 * need the actual data) and it cannot fail so do it inline 416 * for speed. 417 */ 418 /* NB: struct ether_header is known to be contiguous */ 419 n->m_len += sizeof(struct ether_header); 420 m->m_len -= sizeof(struct ether_header); 421 m->m_data += sizeof(struct ether_header); 422 /* 423 * Replace the head of the chain. 424 */ 425 n->m_next = m; 426 m = n; 427 } 428 return m; 429#undef TO_BE_RECLAIMED 430} 431 432#define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none) 433/* 434 * Return the transmit key to use in sending a unicast frame. 435 * If a unicast key is set we use that. When no unicast key is set 436 * we fall back to the default transmit key. 437 */ 438static __inline struct ieee80211_key * 439ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 440{ 441 if (KEY_UNDEFINED(ni->ni_ucastkey)) { 442 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 443 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 444 return NULL; 445 return &ic->ic_nw_keys[ic->ic_def_txkey]; 446 } else { 447 return &ni->ni_ucastkey; 448 } 449} 450 451/* 452 * Return the transmit key to use in sending a multicast frame. 453 * Multicast traffic always uses the group key which is installed as 454 * the default tx key. 455 */ 456static __inline struct ieee80211_key * 457ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 458{ 459 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 460 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 461 return NULL; 462 return &ic->ic_nw_keys[ic->ic_def_txkey]; 463} 464 465/* 466 * Encapsulate an outbound data frame. The mbuf chain is updated. 467 * If an error is encountered NULL is returned. The caller is required 468 * to provide a node reference and pullup the ethernet header in the 469 * first mbuf. 470 */ 471struct mbuf * 472ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 473 struct ieee80211_node *ni) 474{ 475 struct ether_header eh; 476 struct ieee80211_frame *wh; 477 struct ieee80211_key *key; 478 struct llc *llc; 479 int hdrsize, datalen, addqos; 480 481 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 482 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 483 484 /* 485 * Insure space for additional headers. First identify 486 * transmit key to use in calculating any buffer adjustments 487 * required. This is also used below to do privacy 488 * encapsulation work. Then calculate the 802.11 header 489 * size and any padding required by the driver. 490 * 491 * Note key may be NULL if we fall back to the default 492 * transmit key and that is not set. In that case the 493 * buffer may not be expanded as needed by the cipher 494 * routines, but they will/should discard it. 495 */ 496 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 497 if (ic->ic_opmode == IEEE80211_M_STA || 498 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 499 key = ieee80211_crypto_getucastkey(ic, ni); 500 else 501 key = ieee80211_crypto_getmcastkey(ic, ni); 502 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 503 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 504 "[%s] no default transmit key (%s) deftxkey %u\n", 505 ether_sprintf(eh.ether_dhost), __func__, 506 ic->ic_def_txkey); 507 ic->ic_stats.is_tx_nodefkey++; 508 } 509 } else 510 key = NULL; 511 /* XXX 4-address format */ 512 /* 513 * XXX Some ap's don't handle QoS-encapsulated EAPOL 514 * frames so suppress use. This may be an issue if other 515 * ap's require all data frames to be QoS-encapsulated 516 * once negotiated in which case we'll need to make this 517 * configurable. 518 */ 519 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 520 eh.ether_type != htons(ETHERTYPE_PAE); 521 if (addqos) 522 hdrsize = sizeof(struct ieee80211_qosframe); 523 else 524 hdrsize = sizeof(struct ieee80211_frame); 525 if (ic->ic_flags & IEEE80211_F_DATAPAD) 526 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 527 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 528 if (m == NULL) { 529 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 530 goto bad; 531 } 532 533 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 534 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 535 llc = mtod(m, struct llc *); 536 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 537 llc->llc_control = LLC_UI; 538 llc->llc_snap.org_code[0] = 0; 539 llc->llc_snap.org_code[1] = 0; 540 llc->llc_snap.org_code[2] = 0; 541 llc->llc_snap.ether_type = eh.ether_type; 542 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 543 544 M_PREPEND(m, hdrsize, M_DONTWAIT); 545 if (m == NULL) { 546 ic->ic_stats.is_tx_nobuf++; 547 goto bad; 548 } 549 wh = mtod(m, struct ieee80211_frame *); 550 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 551 *(u_int16_t *)wh->i_dur = 0; 552 switch (ic->ic_opmode) { 553 case IEEE80211_M_STA: 554 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 555 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 556 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 557 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 558 break; 559 case IEEE80211_M_IBSS: 560 case IEEE80211_M_AHDEMO: 561 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 562 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 563 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 564 /* 565 * NB: always use the bssid from ic_bss as the 566 * neighbor's may be stale after an ibss merge 567 */ 568 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 569 break; 570 case IEEE80211_M_HOSTAP: 571 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 572 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 573 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 574 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 575 break; 576 case IEEE80211_M_MONITOR: 577 goto bad; 578 } 579 if (m->m_flags & M_MORE_DATA) 580 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 581 if (addqos) { 582 struct ieee80211_qosframe *qwh = 583 (struct ieee80211_qosframe *) wh; 584 int ac, tid; 585 586 ac = M_WME_GETAC(m); 587 /* map from access class/queue to 11e header priorty value */ 588 tid = WME_AC_TO_TID(ac); 589 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 590 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 591 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 592 qwh->i_qos[1] = 0; 593 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 594 595 *(u_int16_t *)wh->i_seq = 596 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 597 ni->ni_txseqs[tid]++; 598 } else { 599 *(u_int16_t *)wh->i_seq = 600 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 601 ni->ni_txseqs[0]++; 602 } 603 if (key != NULL) { 604 /* 605 * IEEE 802.1X: send EAPOL frames always in the clear. 606 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 607 */ 608 if (eh.ether_type != htons(ETHERTYPE_PAE) || 609 ((ic->ic_flags & IEEE80211_F_WPA) && 610 (ic->ic_opmode == IEEE80211_M_STA ? 611 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) { 612 wh->i_fc[1] |= IEEE80211_FC1_WEP; 613 /* XXX do fragmentation */ 614 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 615 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 616 "[%s] enmic failed, discard frame\n", 617 ether_sprintf(eh.ether_dhost)); 618 ic->ic_stats.is_crypto_enmicfail++; 619 goto bad; 620 } 621 } 622 } 623 624 IEEE80211_NODE_STAT(ni, tx_data); 625 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 626 627 return m; 628bad: 629 if (m != NULL) 630 m_freem(m); 631 return NULL; 632} 633 634/* 635 * Add a supported rates element id to a frame. 636 */ 637static u_int8_t * 638ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 639{ 640 int nrates; 641 642 *frm++ = IEEE80211_ELEMID_RATES; 643 nrates = rs->rs_nrates; 644 if (nrates > IEEE80211_RATE_SIZE) 645 nrates = IEEE80211_RATE_SIZE; 646 *frm++ = nrates; 647 memcpy(frm, rs->rs_rates, nrates); 648 return frm + nrates; 649} 650 651/* 652 * Add an extended supported rates element id to a frame. 653 */ 654static u_int8_t * 655ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 656{ 657 /* 658 * Add an extended supported rates element if operating in 11g mode. 659 */ 660 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 661 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 662 *frm++ = IEEE80211_ELEMID_XRATES; 663 *frm++ = nrates; 664 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 665 frm += nrates; 666 } 667 return frm; 668} 669 670/* 671 * Add an ssid elemet to a frame. 672 */ 673static u_int8_t * 674ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 675{ 676 *frm++ = IEEE80211_ELEMID_SSID; 677 *frm++ = len; 678 memcpy(frm, ssid, len); 679 return frm + len; 680} 681 682/* 683 * Add an erp element to a frame. 684 */ 685static u_int8_t * 686ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 687{ 688 u_int8_t erp; 689 690 *frm++ = IEEE80211_ELEMID_ERP; 691 *frm++ = 1; 692 erp = 0; 693 if (ic->ic_nonerpsta != 0) 694 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 695 if (ic->ic_flags & IEEE80211_F_USEPROT) 696 erp |= IEEE80211_ERP_USE_PROTECTION; 697 if (ic->ic_flags & IEEE80211_F_USEBARKER) 698 erp |= IEEE80211_ERP_LONG_PREAMBLE; 699 *frm++ = erp; 700 return frm; 701} 702 703static u_int8_t * 704ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 705{ 706#define WPA_OUI_BYTES 0x00, 0x50, 0xf2 707#define ADDSHORT(frm, v) do { \ 708 frm[0] = (v) & 0xff; \ 709 frm[1] = (v) >> 8; \ 710 frm += 2; \ 711} while (0) 712#define ADDSELECTOR(frm, sel) do { \ 713 memcpy(frm, sel, 4); \ 714 frm += 4; \ 715} while (0) 716 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 717 static const u_int8_t cipher_suite[][4] = { 718 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 719 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 720 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 721 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 722 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 723 { WPA_OUI_BYTES, WPA_CSE_NULL }, 724 }; 725 static const u_int8_t wep104_suite[4] = 726 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 727 static const u_int8_t key_mgt_unspec[4] = 728 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 729 static const u_int8_t key_mgt_psk[4] = 730 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 731 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 732 u_int8_t *frm = ie; 733 u_int8_t *selcnt; 734 735 *frm++ = IEEE80211_ELEMID_VENDOR; 736 *frm++ = 0; /* length filled in below */ 737 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 738 frm += sizeof(oui); 739 ADDSHORT(frm, WPA_VERSION); 740 741 /* XXX filter out CKIP */ 742 743 /* multicast cipher */ 744 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 745 rsn->rsn_mcastkeylen >= 13) 746 ADDSELECTOR(frm, wep104_suite); 747 else 748 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 749 750 /* unicast cipher list */ 751 selcnt = frm; 752 ADDSHORT(frm, 0); /* selector count */ 753 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 754 selcnt[0]++; 755 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 756 } 757 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 758 selcnt[0]++; 759 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 760 } 761 762 /* authenticator selector list */ 763 selcnt = frm; 764 ADDSHORT(frm, 0); /* selector count */ 765 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 766 selcnt[0]++; 767 ADDSELECTOR(frm, key_mgt_unspec); 768 } 769 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 770 selcnt[0]++; 771 ADDSELECTOR(frm, key_mgt_psk); 772 } 773 774 /* optional capabilities */ 775 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 776 ADDSHORT(frm, rsn->rsn_caps); 777 778 /* calculate element length */ 779 ie[1] = frm - ie - 2; 780 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 781 ("WPA IE too big, %u > %zu", 782 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 783 return frm; 784#undef ADDSHORT 785#undef ADDSELECTOR 786#undef WPA_OUI_BYTES 787} 788 789static u_int8_t * 790ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 791{ 792#define RSN_OUI_BYTES 0x00, 0x0f, 0xac 793#define ADDSHORT(frm, v) do { \ 794 frm[0] = (v) & 0xff; \ 795 frm[1] = (v) >> 8; \ 796 frm += 2; \ 797} while (0) 798#define ADDSELECTOR(frm, sel) do { \ 799 memcpy(frm, sel, 4); \ 800 frm += 4; \ 801} while (0) 802 static const u_int8_t cipher_suite[][4] = { 803 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 804 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 805 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 806 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 807 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 808 { RSN_OUI_BYTES, RSN_CSE_NULL }, 809 }; 810 static const u_int8_t wep104_suite[4] = 811 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 812 static const u_int8_t key_mgt_unspec[4] = 813 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 814 static const u_int8_t key_mgt_psk[4] = 815 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 816 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 817 u_int8_t *frm = ie; 818 u_int8_t *selcnt; 819 820 *frm++ = IEEE80211_ELEMID_RSN; 821 *frm++ = 0; /* length filled in below */ 822 ADDSHORT(frm, RSN_VERSION); 823 824 /* XXX filter out CKIP */ 825 826 /* multicast cipher */ 827 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 828 rsn->rsn_mcastkeylen >= 13) 829 ADDSELECTOR(frm, wep104_suite); 830 else 831 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 832 833 /* unicast cipher list */ 834 selcnt = frm; 835 ADDSHORT(frm, 0); /* selector count */ 836 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 837 selcnt[0]++; 838 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 839 } 840 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 841 selcnt[0]++; 842 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 843 } 844 845 /* authenticator selector list */ 846 selcnt = frm; 847 ADDSHORT(frm, 0); /* selector count */ 848 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 849 selcnt[0]++; 850 ADDSELECTOR(frm, key_mgt_unspec); 851 } 852 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 853 selcnt[0]++; 854 ADDSELECTOR(frm, key_mgt_psk); 855 } 856 857 /* optional capabilities */ 858 ADDSHORT(frm, rsn->rsn_caps); 859 /* XXX PMKID */ 860 861 /* calculate element length */ 862 ie[1] = frm - ie - 2; 863 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 864 ("RSN IE too big, %u > %zu", 865 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 866 return frm; 867#undef ADDSELECTOR 868#undef ADDSHORT 869#undef RSN_OUI_BYTES 870} 871 872/* 873 * Add a WPA/RSN element to a frame. 874 */ 875static u_int8_t * 876ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 877{ 878 879 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 880 if (ic->ic_flags & IEEE80211_F_WPA2) 881 frm = ieee80211_setup_rsn_ie(ic, frm); 882 if (ic->ic_flags & IEEE80211_F_WPA1) 883 frm = ieee80211_setup_wpa_ie(ic, frm); 884 return frm; 885} 886 887#define WME_OUI_BYTES 0x00, 0x50, 0xf2 888/* 889 * Add a WME information element to a frame. 890 */ 891static u_int8_t * 892ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 893{ 894 static const struct ieee80211_wme_info info = { 895 .wme_id = IEEE80211_ELEMID_VENDOR, 896 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 897 .wme_oui = { WME_OUI_BYTES }, 898 .wme_type = WME_OUI_TYPE, 899 .wme_subtype = WME_INFO_OUI_SUBTYPE, 900 .wme_version = WME_VERSION, 901 .wme_info = 0, 902 }; 903 memcpy(frm, &info, sizeof(info)); 904 return frm + sizeof(info); 905} 906 907/* 908 * Add a WME parameters element to a frame. 909 */ 910static u_int8_t * 911ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 912{ 913#define SM(_v, _f) (((_v) << _f##_S) & _f) 914#define ADDSHORT(frm, v) do { \ 915 frm[0] = (v) & 0xff; \ 916 frm[1] = (v) >> 8; \ 917 frm += 2; \ 918} while (0) 919 /* NB: this works 'cuz a param has an info at the front */ 920 static const struct ieee80211_wme_info param = { 921 .wme_id = IEEE80211_ELEMID_VENDOR, 922 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 923 .wme_oui = { WME_OUI_BYTES }, 924 .wme_type = WME_OUI_TYPE, 925 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 926 .wme_version = WME_VERSION, 927 }; 928 int i; 929 930 memcpy(frm, ¶m, sizeof(param)); 931 frm += __offsetof(struct ieee80211_wme_info, wme_info); 932 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 933 *frm++ = 0; /* reserved field */ 934 for (i = 0; i < WME_NUM_AC; i++) { 935 const struct wmeParams *ac = 936 &wme->wme_bssChanParams.cap_wmeParams[i]; 937 *frm++ = SM(i, WME_PARAM_ACI) 938 | SM(ac->wmep_acm, WME_PARAM_ACM) 939 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 940 ; 941 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 942 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 943 ; 944 ADDSHORT(frm, ac->wmep_txopLimit); 945 } 946 return frm; 947#undef SM 948#undef ADDSHORT 949} 950#undef WME_OUI_BYTES 951 952/* 953 * Send a probe request frame with the specified ssid 954 * and any optional information element data. 955 */ 956int 957ieee80211_send_probereq(struct ieee80211_node *ni, 958 const u_int8_t sa[IEEE80211_ADDR_LEN], 959 const u_int8_t da[IEEE80211_ADDR_LEN], 960 const u_int8_t bssid[IEEE80211_ADDR_LEN], 961 const u_int8_t *ssid, size_t ssidlen, 962 const void *optie, size_t optielen) 963{ 964 struct ieee80211com *ic = ni->ni_ic; 965 enum ieee80211_phymode mode; 966 struct ieee80211_frame *wh; 967 struct mbuf *m; 968 u_int8_t *frm; 969 970 /* 971 * Hold a reference on the node so it doesn't go away until after 972 * the xmit is complete all the way in the driver. On error we 973 * will remove our reference. 974 */ 975 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 976 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 977 __func__, __LINE__, 978 ni, ether_sprintf(ni->ni_macaddr), 979 ieee80211_node_refcnt(ni)+1); 980 ieee80211_ref_node(ni); 981 982 /* 983 * prreq frame format 984 * [tlv] ssid 985 * [tlv] supported rates 986 * [tlv] extended supported rates 987 * [tlv] user-specified ie's 988 */ 989 m = ieee80211_getmgtframe(&frm, 990 2 + IEEE80211_NWID_LEN 991 + 2 + IEEE80211_RATE_SIZE 992 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 993 + (optie != NULL ? optielen : 0) 994 ); 995 if (m == NULL) { 996 ic->ic_stats.is_tx_nobuf++; 997 ieee80211_free_node(ni); 998 return ENOMEM; 999 } 1000 1001 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1002 mode = ieee80211_chan2mode(ic, ni->ni_chan); 1003 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1004 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1005 1006 if (optie != NULL) { 1007 memcpy(frm, optie, optielen); 1008 frm += optielen; 1009 } 1010 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1011 1012 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1013 if (m == NULL) 1014 return ENOMEM; 1015 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1016 m->m_pkthdr.rcvif = (void *)ni; 1017 1018 wh = mtod(m, struct ieee80211_frame *); 1019 ieee80211_send_setup(ic, ni, wh, 1020 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1021 sa, da, bssid); 1022 /* XXX power management? */ 1023 1024 IEEE80211_NODE_STAT(ni, tx_probereq); 1025 IEEE80211_NODE_STAT(ni, tx_mgmt); 1026 1027 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1028 "[%s] send probe req on channel %u\n", 1029 ether_sprintf(wh->i_addr1), 1030 ieee80211_chan2ieee(ic, ni->ni_chan)); 1031 1032 IF_ENQUEUE(&ic->ic_mgtq, m); 1033 if_start(ic->ic_ifp); 1034 return 0; 1035} 1036 1037/* 1038 * Send a management frame. The node is for the destination (or ic_bss 1039 * when in station mode). Nodes other than ic_bss have their reference 1040 * count bumped to reflect our use for an indeterminant time. 1041 */ 1042int 1043ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1044 int type, int arg) 1045{ 1046#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1047 struct mbuf *m; 1048 u_int8_t *frm; 1049 u_int16_t capinfo; 1050 int has_challenge, is_shared_key, ret, timer, status; 1051 1052 KASSERT(ni != NULL, ("null node")); 1053 1054 /* 1055 * Hold a reference on the node so it doesn't go away until after 1056 * the xmit is complete all the way in the driver. On error we 1057 * will remove our reference. 1058 */ 1059 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1060 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1061 __func__, __LINE__, 1062 ni, ether_sprintf(ni->ni_macaddr), 1063 ieee80211_node_refcnt(ni)+1); 1064 ieee80211_ref_node(ni); 1065 1066 timer = 0; 1067 switch (type) { 1068 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1069 /* 1070 * probe response frame format 1071 * [8] time stamp 1072 * [2] beacon interval 1073 * [2] cabability information 1074 * [tlv] ssid 1075 * [tlv] supported rates 1076 * [tlv] parameter set (FH/DS) 1077 * [tlv] parameter set (IBSS) 1078 * [tlv] extended rate phy (ERP) 1079 * [tlv] extended supported rates 1080 * [tlv] WPA 1081 * [tlv] WME (optional) 1082 */ 1083 m = ieee80211_getmgtframe(&frm, 1084 8 1085 + sizeof(u_int16_t) 1086 + sizeof(u_int16_t) 1087 + 2 + IEEE80211_NWID_LEN 1088 + 2 + IEEE80211_RATE_SIZE 1089 + 7 /* max(7,3) */ 1090 + 6 1091 + 3 1092 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1093 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1094 + (ic->ic_flags & IEEE80211_F_WPA ? 1095 2*sizeof(struct ieee80211_ie_wpa) : 0) 1096 + sizeof(struct ieee80211_wme_param) 1097 ); 1098 if (m == NULL) 1099 senderr(ENOMEM, is_tx_nobuf); 1100 1101 memset(frm, 0, 8); /* timestamp should be filled later */ 1102 frm += 8; 1103 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1104 frm += 2; 1105 if (ic->ic_opmode == IEEE80211_M_IBSS) 1106 capinfo = IEEE80211_CAPINFO_IBSS; 1107 else 1108 capinfo = IEEE80211_CAPINFO_ESS; 1109 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1110 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1111 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1112 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1113 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1114 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1115 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1116 *(u_int16_t *)frm = htole16(capinfo); 1117 frm += 2; 1118 1119 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1120 ic->ic_bss->ni_esslen); 1121 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1122 1123 if (ic->ic_phytype == IEEE80211_T_FH) { 1124 *frm++ = IEEE80211_ELEMID_FHPARMS; 1125 *frm++ = 5; 1126 *frm++ = ni->ni_fhdwell & 0x00ff; 1127 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1128 *frm++ = IEEE80211_FH_CHANSET( 1129 ieee80211_chan2ieee(ic, ni->ni_chan)); 1130 *frm++ = IEEE80211_FH_CHANPAT( 1131 ieee80211_chan2ieee(ic, ni->ni_chan)); 1132 *frm++ = ni->ni_fhindex; 1133 } else { 1134 *frm++ = IEEE80211_ELEMID_DSPARMS; 1135 *frm++ = 1; 1136 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1137 } 1138 1139 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1140 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1141 *frm++ = 2; 1142 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1143 } 1144 if (ic->ic_flags & IEEE80211_F_WPA) 1145 frm = ieee80211_add_wpa(frm, ic); 1146 if (ic->ic_curmode == IEEE80211_MODE_11G) 1147 frm = ieee80211_add_erp(frm, ic); 1148 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1149 if (ic->ic_flags & IEEE80211_F_WME) 1150 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1151 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1152 break; 1153 1154 case IEEE80211_FC0_SUBTYPE_AUTH: 1155 status = arg >> 16; 1156 arg &= 0xffff; 1157 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1158 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1159 ni->ni_challenge != NULL); 1160 1161 /* 1162 * Deduce whether we're doing open authentication or 1163 * shared key authentication. We do the latter if 1164 * we're in the middle of a shared key authentication 1165 * handshake or if we're initiating an authentication 1166 * request and configured to use shared key. 1167 */ 1168 is_shared_key = has_challenge || 1169 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1170 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1171 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1172 1173 m = ieee80211_getmgtframe(&frm, 1174 3 * sizeof(u_int16_t) 1175 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1176 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1177 ); 1178 if (m == NULL) 1179 senderr(ENOMEM, is_tx_nobuf); 1180 1181 ((u_int16_t *)frm)[0] = 1182 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1183 : htole16(IEEE80211_AUTH_ALG_OPEN); 1184 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1185 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1186 1187 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1188 ((u_int16_t *)frm)[3] = 1189 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1190 IEEE80211_ELEMID_CHALLENGE); 1191 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1192 IEEE80211_CHALLENGE_LEN); 1193 m->m_pkthdr.len = m->m_len = 1194 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1195 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1196 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1197 "[%s] request encrypt frame (%s)\n", 1198 ether_sprintf(ni->ni_macaddr), __func__); 1199 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1200 } 1201 } else 1202 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1203 1204 /* XXX not right for shared key */ 1205 if (status == IEEE80211_STATUS_SUCCESS) 1206 IEEE80211_NODE_STAT(ni, tx_auth); 1207 else 1208 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1209 1210 if (ic->ic_opmode == IEEE80211_M_STA) 1211 timer = IEEE80211_TRANS_WAIT; 1212 break; 1213 1214 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1215 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1216 "[%s] send station deauthenticate (reason %d)\n", 1217 ether_sprintf(ni->ni_macaddr), arg); 1218 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1219 if (m == NULL) 1220 senderr(ENOMEM, is_tx_nobuf); 1221 *(u_int16_t *)frm = htole16(arg); /* reason */ 1222 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1223 1224 IEEE80211_NODE_STAT(ni, tx_deauth); 1225 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1226 1227 ieee80211_node_unauthorize(ni); /* port closed */ 1228 break; 1229 1230 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1231 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1232 /* 1233 * asreq frame format 1234 * [2] capability information 1235 * [2] listen interval 1236 * [6*] current AP address (reassoc only) 1237 * [tlv] ssid 1238 * [tlv] supported rates 1239 * [tlv] extended supported rates 1240 * [tlv] WME 1241 * [tlv] user-specified ie's 1242 */ 1243 m = ieee80211_getmgtframe(&frm, 1244 sizeof(u_int16_t) 1245 + sizeof(u_int16_t) 1246 + IEEE80211_ADDR_LEN 1247 + 2 + IEEE80211_NWID_LEN 1248 + 2 + IEEE80211_RATE_SIZE 1249 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1250 + sizeof(struct ieee80211_wme_info) 1251 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1252 ); 1253 if (m == NULL) 1254 senderr(ENOMEM, is_tx_nobuf); 1255 1256 capinfo = 0; 1257 if (ic->ic_opmode == IEEE80211_M_IBSS) 1258 capinfo |= IEEE80211_CAPINFO_IBSS; 1259 else /* IEEE80211_M_STA */ 1260 capinfo |= IEEE80211_CAPINFO_ESS; 1261 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1262 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1263 /* 1264 * NB: Some 11a AP's reject the request when 1265 * short premable is set. 1266 */ 1267 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1268 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1269 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1270 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1271 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1272 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1273 *(u_int16_t *)frm = htole16(capinfo); 1274 frm += 2; 1275 1276 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1277 frm += 2; 1278 1279 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1280 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1281 frm += IEEE80211_ADDR_LEN; 1282 } 1283 1284 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1285 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1286 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1287 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1288 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1289 if (ic->ic_opt_ie != NULL) { 1290 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1291 frm += ic->ic_opt_ie_len; 1292 } 1293 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1294 1295 timer = IEEE80211_TRANS_WAIT; 1296 break; 1297 1298 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1299 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1300 /* 1301 * asreq frame format 1302 * [2] capability information 1303 * [2] status 1304 * [2] association ID 1305 * [tlv] supported rates 1306 * [tlv] extended supported rates 1307 * [tlv] WME (if enabled and STA enabled) 1308 */ 1309 m = ieee80211_getmgtframe(&frm, 1310 sizeof(u_int16_t) 1311 + sizeof(u_int16_t) 1312 + sizeof(u_int16_t) 1313 + 2 + IEEE80211_RATE_SIZE 1314 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1315 + sizeof(struct ieee80211_wme_param) 1316 ); 1317 if (m == NULL) 1318 senderr(ENOMEM, is_tx_nobuf); 1319 1320 capinfo = IEEE80211_CAPINFO_ESS; 1321 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1322 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1323 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1324 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1325 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1326 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1327 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1328 *(u_int16_t *)frm = htole16(capinfo); 1329 frm += 2; 1330 1331 *(u_int16_t *)frm = htole16(arg); /* status */ 1332 frm += 2; 1333 1334 if (arg == IEEE80211_STATUS_SUCCESS) { 1335 *(u_int16_t *)frm = htole16(ni->ni_associd); 1336 IEEE80211_NODE_STAT(ni, tx_assoc); 1337 } else 1338 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1339 frm += 2; 1340 1341 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1342 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1343 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1344 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1345 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1346 break; 1347 1348 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1349 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1350 "[%s] send station disassociate (reason %d)\n", 1351 ether_sprintf(ni->ni_macaddr), arg); 1352 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1353 if (m == NULL) 1354 senderr(ENOMEM, is_tx_nobuf); 1355 *(u_int16_t *)frm = htole16(arg); /* reason */ 1356 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1357 1358 IEEE80211_NODE_STAT(ni, tx_disassoc); 1359 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1360 break; 1361 1362 default: 1363 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1364 "[%s] invalid mgmt frame type %u\n", 1365 ether_sprintf(ni->ni_macaddr), type); 1366 senderr(EINVAL, is_tx_unknownmgt); 1367 /* NOTREACHED */ 1368 } 1369 1370 ret = ieee80211_mgmt_output(ic, ni, m, type); 1371 if (ret == 0) { 1372 if (timer) 1373 ic->ic_mgt_timer = timer; 1374 } else { 1375bad: 1376 ieee80211_free_node(ni); 1377 } 1378 return ret; 1379#undef senderr 1380} 1381 1382/* 1383 * Allocate a beacon frame and fillin the appropriate bits. 1384 */ 1385struct mbuf * 1386ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1387 struct ieee80211_beacon_offsets *bo) 1388{ 1389 struct ifnet *ifp = ic->ic_ifp; 1390 struct ieee80211_frame *wh; 1391 struct mbuf *m; 1392 int pktlen; 1393 u_int8_t *frm, *efrm; 1394 u_int16_t capinfo; 1395 struct ieee80211_rateset *rs; 1396 1397 /* 1398 * beacon frame format 1399 * [8] time stamp 1400 * [2] beacon interval 1401 * [2] cabability information 1402 * [tlv] ssid 1403 * [tlv] supported rates 1404 * [3] parameter set (DS) 1405 * [tlv] parameter set (IBSS/TIM) 1406 * [tlv] extended rate phy (ERP) 1407 * [tlv] extended supported rates 1408 * [tlv] WME parameters 1409 * [tlv] WPA/RSN parameters 1410 * XXX Vendor-specific OIDs (e.g. Atheros) 1411 * NB: we allocate the max space required for the TIM bitmap. 1412 */ 1413 rs = &ni->ni_rates; 1414 pktlen = 8 /* time stamp */ 1415 + sizeof(u_int16_t) /* beacon interval */ 1416 + sizeof(u_int16_t) /* capabilities */ 1417 + 2 + ni->ni_esslen /* ssid */ 1418 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1419 + 2 + 1 /* DS parameters */ 1420 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1421 + 2 + 1 /* ERP */ 1422 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1423 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1424 sizeof(struct ieee80211_wme_param) : 0) 1425 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1426 2*sizeof(struct ieee80211_ie_wpa) : 0) 1427 ; 1428 m = ieee80211_getmgtframe(&frm, pktlen); 1429 if (m == NULL) { 1430 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1431 "%s: cannot get buf; size %u\n", __func__, pktlen); 1432 ic->ic_stats.is_tx_nobuf++; 1433 return NULL; 1434 } 1435 1436 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1437 frm += 8; 1438 *(u_int16_t *)frm = htole16(ni->ni_intval); 1439 frm += 2; 1440 if (ic->ic_opmode == IEEE80211_M_IBSS) 1441 capinfo = IEEE80211_CAPINFO_IBSS; 1442 else 1443 capinfo = IEEE80211_CAPINFO_ESS; 1444 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1445 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1446 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1447 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1448 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1449 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1450 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1451 bo->bo_caps = (u_int16_t *)frm; 1452 *(u_int16_t *)frm = htole16(capinfo); 1453 frm += 2; 1454 *frm++ = IEEE80211_ELEMID_SSID; 1455 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1456 *frm++ = ni->ni_esslen; 1457 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1458 frm += ni->ni_esslen; 1459 } else 1460 *frm++ = 0; 1461 frm = ieee80211_add_rates(frm, rs); 1462 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1463 *frm++ = IEEE80211_ELEMID_DSPARMS; 1464 *frm++ = 1; 1465 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1466 } 1467 bo->bo_tim = frm; 1468 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1469 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1470 *frm++ = 2; 1471 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1472 bo->bo_tim_len = 0; 1473 } else { 1474 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1475 1476 tie->tim_ie = IEEE80211_ELEMID_TIM; 1477 tie->tim_len = 4; /* length */ 1478 tie->tim_count = 0; /* DTIM count */ 1479 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1480 tie->tim_bitctl = 0; /* bitmap control */ 1481 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1482 frm += sizeof(struct ieee80211_tim_ie); 1483 bo->bo_tim_len = 1; 1484 } 1485 bo->bo_trailer = frm; 1486 if (ic->ic_flags & IEEE80211_F_WME) { 1487 bo->bo_wme = frm; 1488 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1489 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1490 } 1491 if (ic->ic_flags & IEEE80211_F_WPA) 1492 frm = ieee80211_add_wpa(frm, ic); 1493 if (ic->ic_curmode == IEEE80211_MODE_11G) 1494 frm = ieee80211_add_erp(frm, ic); 1495 efrm = ieee80211_add_xrates(frm, rs); 1496 bo->bo_trailer_len = efrm - bo->bo_trailer; 1497 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1498 1499 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1500 KASSERT(m != NULL, ("no space for 802.11 header?")); 1501 wh = mtod(m, struct ieee80211_frame *); 1502 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1503 IEEE80211_FC0_SUBTYPE_BEACON; 1504 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1505 *(u_int16_t *)wh->i_dur = 0; 1506 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1507 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1508 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1509 *(u_int16_t *)wh->i_seq = 0; 1510 1511 return m; 1512} 1513 1514/* 1515 * Update the dynamic parts of a beacon frame based on the current state. 1516 */ 1517int 1518ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1519 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1520{ 1521 int len_changed = 0; 1522 u_int16_t capinfo; 1523 1524 IEEE80211_BEACON_LOCK(ic); 1525 /* XXX faster to recalculate entirely or just changes? */ 1526 if (ic->ic_opmode == IEEE80211_M_IBSS) 1527 capinfo = IEEE80211_CAPINFO_IBSS; 1528 else 1529 capinfo = IEEE80211_CAPINFO_ESS; 1530 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1531 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1532 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1533 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1534 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1535 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1536 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1537 *bo->bo_caps = htole16(capinfo); 1538 1539 if (ic->ic_flags & IEEE80211_F_WME) { 1540 struct ieee80211_wme_state *wme = &ic->ic_wme; 1541 1542 /* 1543 * Check for agressive mode change. When there is 1544 * significant high priority traffic in the BSS 1545 * throttle back BE traffic by using conservative 1546 * parameters. Otherwise BE uses agressive params 1547 * to optimize performance of legacy/non-QoS traffic. 1548 */ 1549 if (wme->wme_flags & WME_F_AGGRMODE) { 1550 if (wme->wme_hipri_traffic > 1551 wme->wme_hipri_switch_thresh) { 1552 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1553 "%s: traffic %u, disable aggressive mode\n", 1554 __func__, wme->wme_hipri_traffic); 1555 wme->wme_flags &= ~WME_F_AGGRMODE; 1556 ieee80211_wme_updateparams_locked(ic); 1557 wme->wme_hipri_traffic = 1558 wme->wme_hipri_switch_hysteresis; 1559 } else 1560 wme->wme_hipri_traffic = 0; 1561 } else { 1562 if (wme->wme_hipri_traffic <= 1563 wme->wme_hipri_switch_thresh) { 1564 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1565 "%s: traffic %u, enable aggressive mode\n", 1566 __func__, wme->wme_hipri_traffic); 1567 wme->wme_flags |= WME_F_AGGRMODE; 1568 ieee80211_wme_updateparams_locked(ic); 1569 wme->wme_hipri_traffic = 0; 1570 } else 1571 wme->wme_hipri_traffic = 1572 wme->wme_hipri_switch_hysteresis; 1573 } 1574 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1575 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1576 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1577 } 1578 } 1579 1580 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1581 struct ieee80211_tim_ie *tie = 1582 (struct ieee80211_tim_ie *) bo->bo_tim; 1583 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1584 u_int timlen, timoff, i; 1585 /* 1586 * ATIM/DTIM needs updating. If it fits in the 1587 * current space allocated then just copy in the 1588 * new bits. Otherwise we need to move any trailing 1589 * data to make room. Note that we know there is 1590 * contiguous space because ieee80211_beacon_allocate 1591 * insures there is space in the mbuf to write a 1592 * maximal-size virtual bitmap (based on ic_max_aid). 1593 */ 1594 /* 1595 * Calculate the bitmap size and offset, copy any 1596 * trailer out of the way, and then copy in the 1597 * new bitmap and update the information element. 1598 * Note that the tim bitmap must contain at least 1599 * one byte and any offset must be even. 1600 */ 1601 if (ic->ic_ps_pending != 0) { 1602 timoff = 128; /* impossibly large */ 1603 for (i = 0; i < ic->ic_tim_len; i++) 1604 if (ic->ic_tim_bitmap[i]) { 1605 timoff = i &~ 1; 1606 break; 1607 } 1608 KASSERT(timoff != 128, ("tim bitmap empty!")); 1609 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1610 if (ic->ic_tim_bitmap[i]) 1611 break; 1612 timlen = 1 + (i - timoff); 1613 } else { 1614 timoff = 0; 1615 timlen = 1; 1616 } 1617 if (timlen != bo->bo_tim_len) { 1618 /* copy up/down trailer */ 1619 ovbcopy(bo->bo_trailer, tie->tim_bitmap+timlen, 1620 bo->bo_trailer_len); 1621 bo->bo_trailer = tie->tim_bitmap+timlen; 1622 bo->bo_wme = bo->bo_trailer; 1623 bo->bo_tim_len = timlen; 1624 1625 /* update information element */ 1626 tie->tim_len = 3 + timlen; 1627 tie->tim_bitctl = timoff; 1628 len_changed = 1; 1629 } 1630 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1631 bo->bo_tim_len); 1632 1633 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1634 1635 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1636 "%s: TIM updated, pending %u, off %u, len %u\n", 1637 __func__, ic->ic_ps_pending, timoff, timlen); 1638 } 1639 /* count down DTIM period */ 1640 if (tie->tim_count == 0) 1641 tie->tim_count = tie->tim_period - 1; 1642 else 1643 tie->tim_count--; 1644 /* update state for buffered multicast frames on DTIM */ 1645 if (mcast && (tie->tim_count == 1 || tie->tim_period == 1)) 1646 tie->tim_bitctl |= 1; 1647 else 1648 tie->tim_bitctl &= ~1; 1649 } 1650 IEEE80211_BEACON_UNLOCK(ic); 1651 1652 return len_changed; 1653} 1654 1655/* 1656 * Save an outbound packet for a node in power-save sleep state. 1657 * The new packet is placed on the node's saved queue, and the TIM 1658 * is changed, if necessary. 1659 */ 1660void 1661ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1662 struct mbuf *m) 1663{ 1664 int qlen, age; 1665 1666 IEEE80211_NODE_SAVEQ_LOCK(ni); 1667 if (_IF_QFULL(&ni->ni_savedq)) { 1668 _IF_DROP(&ni->ni_savedq); 1669 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1670 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1671 "[%s] pwr save q overflow, drops %d (size %d)\n", 1672 ether_sprintf(ni->ni_macaddr), 1673 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1674#ifdef IEEE80211_DEBUG 1675 if (ieee80211_msg_dumppkts(ic)) 1676 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1677#endif 1678 m_freem(m); 1679 return; 1680 } 1681 /* 1682 * Tag the frame with it's expiry time and insert 1683 * it in the queue. The aging interval is 4 times 1684 * the listen interval specified by the station. 1685 * Frames that sit around too long are reclaimed 1686 * using this information. 1687 */ 1688 /* XXX handle overflow? */ 1689 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */ 1690 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1691 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1692 1693 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1694 "[%s] save frame, %u now queued\n", 1695 ether_sprintf(ni->ni_macaddr), qlen); 1696 1697 if (qlen == 1) 1698 ic->ic_set_tim(ni, 1); 1699} 1700