1 /* $NetBSD: ieee80211_output.c,v 1.33 2005/07/26 22:52:48 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.26 2005/07/06 01:55:17 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.33 2005/07/26 22:52:48 dyoung Exp $"); 40 #endif 41 42 #include "opt_inet.h" 43 44 #ifdef __NetBSD__ 45 #include "bpfilter.h" 46 #endif /* __NetBSD__ */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/kernel.h> 52 #include <sys/endian.h> 53 #include <sys/errno.h> 54 #include <sys/proc.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_llc.h> 59 #include <net/if_media.h> 60 #include <net/if_arp.h> 61 #include <net/if_ether.h> 62 #include <net/if_llc.h> 63 #include <net/if_vlanvar.h> 64 65 #include <net80211/ieee80211_netbsd.h> 66 #include <net80211/ieee80211_var.h> 67 68 #if NBPFILTER > 0 69 #include <net/bpf.h> 70 #endif 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip.h> 77 #include <net/if_ether.h> 78 #endif 79 80 #ifdef IEEE80211_DEBUG 81 /* 82 * Decide if an outbound management frame should be 83 * printed when debugging is enabled. This filters some 84 * of the less interesting frames that come frequently 85 * (e.g. beacons). 86 */ 87 static __inline int 88 doprint(struct ieee80211com *ic, int subtype) 89 { 90 switch (subtype) { 91 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 92 return (ic->ic_opmode == IEEE80211_M_IBSS); 93 } 94 return 1; 95 } 96 #endif 97 98 /* 99 * Send a management frame to the specified node. The node pointer 100 * must have a reference as the pointer will be passed to the driver 101 * and potentially held for a long time. If the frame is successfully 102 * dispatched to the driver, then it is responsible for freeing the 103 * reference (and potentially free'ing up any associated storage). 104 */ 105 static int 106 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 107 struct mbuf *m, int type) 108 { 109 struct ifnet *ifp = ic->ic_ifp; 110 struct ieee80211_frame *wh; 111 112 IASSERT(ni != NULL, ("null node")); 113 114 /* 115 * Yech, hack alert! We want to pass the node down to the 116 * driver's start routine. If we don't do so then the start 117 * routine must immediately look it up again and that can 118 * cause a lock order reversal if, for example, this frame 119 * is being sent because the station is being timedout and 120 * the frame being sent is a DEAUTH message. We could stick 121 * this in an m_tag and tack that on to the mbuf. However 122 * that's rather expensive to do for every frame so instead 123 * we stuff it in the rcvif field since outbound frames do 124 * not (presently) use this. 125 */ 126 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 127 if (m == NULL) 128 return ENOMEM; 129 #ifdef __FreeBSD__ 130 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 131 #endif 132 m->m_pkthdr.rcvif = (void *)ni; 133 134 wh = mtod(m, struct ieee80211_frame *); 135 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type; 136 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 137 *(u_int16_t *)wh->i_dur = 0; 138 *(u_int16_t *)wh->i_seq = 139 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 140 ni->ni_txseqs[0]++; 141 /* 142 * Hack. When sending PROBE_REQ frames while scanning we 143 * explicitly force a broadcast rather than (as before) clobber 144 * ni_macaddr and ni_bssid. This is stopgap, we need a way 145 * to communicate this directly rather than do something 146 * implicit based on surrounding state. 147 */ 148 if (type == IEEE80211_FC0_SUBTYPE_PROBE_REQ && 149 (ic->ic_flags & IEEE80211_F_SCAN)) { 150 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 151 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 152 IEEE80211_ADDR_COPY(wh->i_addr3, ifp->if_broadcastaddr); 153 } else { 154 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 155 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 156 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 157 } 158 159 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 160 m->m_flags &= ~M_LINK0; 161 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 162 "[%s] encrypting frame (%s)\n", 163 ether_sprintf(wh->i_addr1), __func__); 164 wh->i_fc[1] |= IEEE80211_FC1_WEP; 165 } 166 #ifdef IEEE80211_DEBUG 167 /* avoid printing too many frames */ 168 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 169 ieee80211_msg_dumppkts(ic)) { 170 printf("[%s] send %s on channel %u\n", 171 ether_sprintf(wh->i_addr1), 172 ieee80211_mgt_subtype_name[ 173 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 174 IEEE80211_FC0_SUBTYPE_SHIFT], 175 ieee80211_chan2ieee(ic, ni->ni_chan)); 176 } 177 #endif 178 IEEE80211_NODE_STAT(ni, tx_mgmt); 179 IF_ENQUEUE(&ic->ic_mgtq, m); 180 ifp->if_timer = 1; 181 (*ifp->if_start)(ifp); 182 return 0; 183 } 184 185 /* 186 * Send a null data frame to the specified node. 187 */ 188 int 189 ieee80211_send_nulldata(struct ieee80211com *ic, struct ieee80211_node *ni) 190 { 191 struct ifnet *ifp = ic->ic_ifp; 192 struct mbuf *m; 193 struct ieee80211_frame *wh; 194 195 MGETHDR(m, M_NOWAIT, MT_HEADER); 196 if (m == NULL) { 197 /* XXX debug msg */ 198 ic->ic_stats.is_tx_nobuf++; 199 return ENOMEM; 200 } 201 m->m_pkthdr.rcvif = (void *) ieee80211_ref_node(ni); 202 203 wh = mtod(m, struct ieee80211_frame *); 204 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA | 205 IEEE80211_FC0_SUBTYPE_NODATA; 206 *(u_int16_t *)wh->i_dur = 0; 207 *(u_int16_t *)wh->i_seq = 208 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 209 ni->ni_txseqs[0]++; 210 211 /* XXX WDS */ 212 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 213 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 214 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 215 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_myaddr); 216 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 217 218 IEEE80211_NODE_STAT(ni, tx_data); 219 220 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 221 (*ifp->if_start)(ifp); 222 223 return 0; 224 } 225 226 /* 227 * Assign priority to a frame based on any vlan tag assigned 228 * to the station and/or any Diffserv setting in an IP header. 229 * Finally, if an ACM policy is setup (in station mode) it's 230 * applied. 231 */ 232 int 233 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 234 { 235 int v_wme_ac, d_wme_ac, ac; 236 #ifdef INET 237 struct ether_header *eh; 238 #endif 239 240 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 241 ac = WME_AC_BE; 242 goto done; 243 } 244 245 /* 246 * If node has a vlan tag then all traffic 247 * to it must have a matching tag. 248 */ 249 v_wme_ac = 0; 250 if (ni->ni_vlan != 0) { 251 /* XXX used to check ec_nvlans. */ 252 struct m_tag *mtag = m_tag_find(m, PACKET_TAG_VLAN, NULL); 253 if (mtag == NULL) { 254 IEEE80211_NODE_STAT(ni, tx_novlantag); 255 return 1; 256 } 257 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 258 EVL_VLANOFTAG(ni->ni_vlan)) { 259 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 260 return 1; 261 } 262 /* map vlan priority to AC */ 263 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 264 case 1: 265 case 2: 266 v_wme_ac = WME_AC_BK; 267 break; 268 case 0: 269 case 3: 270 v_wme_ac = WME_AC_BE; 271 break; 272 case 4: 273 case 5: 274 v_wme_ac = WME_AC_VI; 275 break; 276 case 6: 277 case 7: 278 v_wme_ac = WME_AC_VO; 279 break; 280 } 281 } 282 283 #ifdef INET 284 eh = mtod(m, struct ether_header *); 285 if (eh->ether_type == htons(ETHERTYPE_IP)) { 286 const struct ip *ip = (struct ip *) 287 (mtod(m, u_int8_t *) + sizeof (*eh)); 288 /* 289 * IP frame, map the TOS field. 290 */ 291 switch (ip->ip_tos) { 292 case 0x08: 293 case 0x20: 294 d_wme_ac = WME_AC_BK; /* background */ 295 break; 296 case 0x28: 297 case 0xa0: 298 d_wme_ac = WME_AC_VI; /* video */ 299 break; 300 case 0x30: /* voice */ 301 case 0xe0: 302 case 0x88: /* XXX UPSD */ 303 case 0xb8: 304 d_wme_ac = WME_AC_VO; 305 break; 306 default: 307 d_wme_ac = WME_AC_BE; 308 break; 309 } 310 } else { 311 #endif /* INET */ 312 d_wme_ac = WME_AC_BE; 313 #ifdef INET 314 } 315 #endif 316 /* 317 * Use highest priority AC. 318 */ 319 if (v_wme_ac > d_wme_ac) 320 ac = v_wme_ac; 321 else 322 ac = d_wme_ac; 323 324 /* 325 * Apply ACM policy. 326 */ 327 if (ic->ic_opmode == IEEE80211_M_STA) { 328 static const int acmap[4] = { 329 WME_AC_BK, /* WME_AC_BE */ 330 WME_AC_BK, /* WME_AC_BK */ 331 WME_AC_BE, /* WME_AC_VI */ 332 WME_AC_VI, /* WME_AC_VO */ 333 }; 334 while (ac != WME_AC_BK && 335 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 336 ac = acmap[ac]; 337 } 338 done: 339 M_WME_SETAC(m, ac); 340 return 0; 341 } 342 343 /* 344 * Insure there is sufficient contiguous space to encapsulate the 345 * 802.11 data frame. If room isn't already there, arrange for it. 346 * Drivers and cipher modules assume we have done the necessary work 347 * and fail rudely if they don't find the space they need. 348 */ 349 static struct mbuf * 350 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 351 struct ieee80211_key *key, struct mbuf *m) 352 { 353 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 354 int needed_space = hdrsize; 355 356 if (key != NULL) { 357 /* XXX belongs in crypto code? */ 358 needed_space += key->wk_cipher->ic_header; 359 /* XXX frags */ 360 } 361 /* 362 * We know we are called just before stripping an Ethernet 363 * header and prepending an LLC header. This means we know 364 * there will be 365 * sizeof(struct ether_header) - sizeof(struct llc) 366 * bytes recovered to which we need additional space for the 367 * 802.11 header and any crypto header. 368 */ 369 /* XXX check trailing space and copy instead? */ 370 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 371 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 372 if (n == NULL) { 373 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 374 "%s: cannot expand storage\n", __func__); 375 ic->ic_stats.is_tx_nobuf++; 376 m_freem(m); 377 return NULL; 378 } 379 IASSERT(needed_space <= MHLEN, 380 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 381 /* 382 * Setup new mbuf to have leading space to prepend the 383 * 802.11 header and any crypto header bits that are 384 * required (the latter are added when the driver calls 385 * back to ieee80211_crypto_encap to do crypto encapsulation). 386 */ 387 /* NB: must be first 'cuz it clobbers m_data */ 388 M_COPY_PKTHDR(n, m); 389 n->m_len = 0; /* NB: m_gethdr does not set */ 390 n->m_data += needed_space; 391 /* 392 * Pull up Ethernet header to create the expected layout. 393 * We could use m_pullup but that's overkill (i.e. we don't 394 * need the actual data) and it cannot fail so do it inline 395 * for speed. 396 */ 397 /* NB: struct ether_header is known to be contiguous */ 398 n->m_len += sizeof(struct ether_header); 399 m->m_len -= sizeof(struct ether_header); 400 m->m_data += sizeof(struct ether_header); 401 /* 402 * Replace the head of the chain. 403 */ 404 n->m_next = m; 405 m = n; 406 } 407 return m; 408 #undef TO_BE_RECLAIMED 409 } 410 411 /* 412 * Return the transmit key to use in sending a unicast frame. 413 * If a unicast key is set we use that. When no unicast key is set 414 * we fall back to the default transmit key. 415 */ 416 static __inline struct ieee80211_key * 417 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 418 { 419 if (IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)) { 420 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 421 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 422 return NULL; 423 return &ic->ic_nw_keys[ic->ic_def_txkey]; 424 } else { 425 return &ni->ni_ucastkey; 426 } 427 } 428 429 /* 430 * Return the transmit key to use in sending a multicast frame. 431 * Multicast traffic always uses the group key which is installed as 432 * the default tx key. 433 */ 434 static __inline struct ieee80211_key * 435 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 436 { 437 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 438 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 439 return NULL; 440 return &ic->ic_nw_keys[ic->ic_def_txkey]; 441 } 442 443 /* 444 * Encapsulate an outbound data frame. The mbuf chain is updated. 445 * If an error is encountered NULL is returned. The caller is required 446 * to provide a node reference and pullup the ethernet header in the 447 * first mbuf. 448 */ 449 struct mbuf * 450 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 451 struct ieee80211_node *ni) 452 { 453 struct ether_header eh; 454 struct ieee80211_frame *wh; 455 struct ieee80211_key *key; 456 struct llc *llc; 457 int hdrsize, datalen, addqos; 458 459 IASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 460 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 461 462 /* 463 * Insure space for additional headers. First identify 464 * transmit key to use in calculating any buffer adjustments 465 * required. This is also used below to do privacy 466 * encapsulation work. Then calculate the 802.11 header 467 * size and any padding required by the driver. 468 * 469 * Note key may be NULL if we fall back to the default 470 * transmit key and that is not set. In that case the 471 * buffer may not be expanded as needed by the cipher 472 * routines, but they will/should discard it. 473 */ 474 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 475 if (ic->ic_opmode == IEEE80211_M_STA || 476 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 477 key = ieee80211_crypto_getucastkey(ic, ni); 478 else 479 key = ieee80211_crypto_getmcastkey(ic, ni); 480 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 481 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 482 "[%s] no default transmit key (%s) deftxkey %u\n", 483 ether_sprintf(eh.ether_dhost), __func__, 484 ic->ic_def_txkey); 485 ic->ic_stats.is_tx_nodefkey++; 486 } 487 } else 488 key = NULL; 489 /* XXX 4-address format */ 490 /* 491 * XXX Some ap's don't handle QoS-encapsulated EAPOL 492 * frames so suppress use. This may be an issue if other 493 * ap's require all data frames to be QoS-encapsulated 494 * once negotiated in which case we'll need to make this 495 * configurable. 496 */ 497 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 498 eh.ether_type != htons(ETHERTYPE_PAE); 499 if (addqos) 500 hdrsize = sizeof(struct ieee80211_qosframe); 501 else 502 hdrsize = sizeof(struct ieee80211_frame); 503 if (ic->ic_flags & IEEE80211_F_DATAPAD) 504 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 505 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 506 if (m == NULL) { 507 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 508 goto bad; 509 } 510 511 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 512 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 513 llc = mtod(m, struct llc *); 514 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 515 llc->llc_control = LLC_UI; 516 llc->llc_snap.org_code[0] = 0; 517 llc->llc_snap.org_code[1] = 0; 518 llc->llc_snap.org_code[2] = 0; 519 llc->llc_snap.ether_type = eh.ether_type; 520 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 521 522 M_PREPEND(m, hdrsize, M_DONTWAIT); 523 if (m == NULL) { 524 ic->ic_stats.is_tx_nobuf++; 525 goto bad; 526 } 527 wh = mtod(m, struct ieee80211_frame *); 528 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 529 *(u_int16_t *)wh->i_dur = 0; 530 switch (ic->ic_opmode) { 531 case IEEE80211_M_STA: 532 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 533 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 534 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 535 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 536 break; 537 case IEEE80211_M_IBSS: 538 case IEEE80211_M_AHDEMO: 539 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 540 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 541 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 542 /* 543 * NB: always use the bssid from ic_bss as the 544 * neighbor's may be stale after an ibss merge 545 */ 546 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 547 break; 548 case IEEE80211_M_HOSTAP: 549 #ifndef IEEE80211_NO_HOSTAP 550 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 551 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 552 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 553 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 554 #endif /* !IEEE80211_NO_HOSTAP */ 555 break; 556 case IEEE80211_M_MONITOR: 557 goto bad; 558 } 559 if (m->m_flags & M_MORE_DATA) 560 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 561 if (addqos) { 562 struct ieee80211_qosframe *qwh = 563 (struct ieee80211_qosframe *) wh; 564 int ac, tid; 565 566 ac = M_WME_GETAC(m); 567 /* map from access class/queue to 11e header priorty value */ 568 tid = WME_AC_TO_TID(ac); 569 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 570 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 571 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 572 qwh->i_qos[1] = 0; 573 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 574 575 *(u_int16_t *)wh->i_seq = 576 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 577 ni->ni_txseqs[tid]++; 578 } else { 579 *(u_int16_t *)wh->i_seq = 580 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 581 ni->ni_txseqs[0]++; 582 } 583 if (key != NULL) { 584 /* 585 * IEEE 802.1X: send EAPOL frames always in the clear. 586 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 587 */ 588 if (eh.ether_type != htons(ETHERTYPE_PAE) || 589 ((ic->ic_flags & IEEE80211_F_WPA) && 590 (ic->ic_opmode == IEEE80211_M_STA ? 591 !IEEE80211_KEY_UNDEFINED(*key) : 592 !IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)))) { 593 wh->i_fc[1] |= IEEE80211_FC1_WEP; 594 /* XXX do fragmentation */ 595 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 596 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 597 "[%s] enmic failed, discard frame\n", 598 ether_sprintf(eh.ether_dhost)); 599 ic->ic_stats.is_crypto_enmicfail++; 600 goto bad; 601 } 602 } 603 } 604 605 IEEE80211_NODE_STAT(ni, tx_data); 606 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 607 608 return m; 609 bad: 610 if (m != NULL) 611 m_freem(m); 612 return NULL; 613 } 614 615 /* 616 * Arguments in: 617 * 618 * paylen: payload length (no FCS, no WEP header) 619 * 620 * hdrlen: header length 621 * 622 * rate: MSDU speed, units 500kb/s 623 * 624 * flags: IEEE80211_F_SHPREAMBLE (use short preamble), 625 * IEEE80211_F_SHSLOT (use short slot length) 626 * 627 * Arguments out: 628 * 629 * d: 802.11 Duration field for RTS, 630 * 802.11 Duration field for data frame, 631 * PLCP Length for data frame, 632 * residual octets at end of data slot 633 */ 634 static int 635 ieee80211_compute_duration1(int len, int use_ack, uint32_t flags, int rate, 636 struct ieee80211_duration *d) 637 { 638 int pre, ctsrate; 639 int ack, bitlen, data_dur, remainder; 640 641 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 642 * DATA reserves medium for SIFS | ACK 643 * 644 * XXXMYC: no ACK on multicast/broadcast or control packets 645 */ 646 647 bitlen = len * 8; 648 649 pre = IEEE80211_DUR_DS_SIFS; 650 if ((flags & IEEE80211_F_SHPREAMBLE) != 0) 651 pre += IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR; 652 else 653 pre += IEEE80211_DUR_DS_LONG_PREAMBLE + IEEE80211_DUR_DS_SLOW_PLCPHDR; 654 655 d->d_residue = 0; 656 data_dur = (bitlen * 2) / rate; 657 remainder = (bitlen * 2) % rate; 658 if (remainder != 0) { 659 d->d_residue = (rate - remainder) / 16; 660 data_dur++; 661 } 662 663 switch (rate) { 664 case 2: /* 1 Mb/s */ 665 case 4: /* 2 Mb/s */ 666 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 667 ctsrate = 2; 668 break; 669 case 11: /* 5.5 Mb/s */ 670 case 22: /* 11 Mb/s */ 671 case 44: /* 22 Mb/s */ 672 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 673 ctsrate = 4; 674 break; 675 default: 676 /* TBD */ 677 return -1; 678 } 679 680 d->d_plcp_len = data_dur; 681 682 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 683 684 d->d_rts_dur = 685 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 686 pre + data_dur + 687 ack; 688 689 d->d_data_dur = ack; 690 691 return 0; 692 } 693 694 /* 695 * Arguments in: 696 * 697 * wh: 802.11 header 698 * 699 * paylen: payload length (no FCS, no WEP header) 700 * 701 * rate: MSDU speed, units 500kb/s 702 * 703 * fraglen: fragment length, set to maximum (or higher) for no 704 * fragmentation 705 * 706 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 707 * IEEE80211_F_SHPREAMBLE (use short preamble), 708 * IEEE80211_F_SHSLOT (use short slot length) 709 * 710 * Arguments out: 711 * 712 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 713 * of first/only fragment 714 * 715 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 716 * of first/only fragment 717 */ 718 int 719 ieee80211_compute_duration(struct ieee80211_frame_min *wh, int len, 720 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 721 struct ieee80211_duration *dn, int *npktp, int debug) 722 { 723 int ack, rc; 724 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 725 726 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 727 hdrlen = sizeof(struct ieee80211_frame_addr4); 728 else 729 hdrlen = sizeof(struct ieee80211_frame); 730 731 paylen = len - hdrlen; 732 733 if ((wh->i_fc[1] & IEEE80211_FC1_WEP) != 0) { 734 /* XXX assumes the packet is already WEP encapsulated */ 735 paylen -= IEEE80211_WEP_TOTLEN; 736 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 737 } else 738 overlen = IEEE80211_CRC_LEN; 739 740 npkt = paylen / fraglen; 741 lastlen0 = paylen % fraglen; 742 743 if (npkt == 0) /* no fragments */ 744 lastlen = paylen + overlen; 745 else if (lastlen0 != 0) { /* a short "tail" fragment */ 746 lastlen = lastlen0 + overlen; 747 npkt++; 748 } else /* full-length "tail" fragment */ 749 lastlen = fraglen + overlen; 750 751 if (npktp != NULL) 752 *npktp = npkt; 753 754 if (npkt > 1) 755 firstlen = fraglen + overlen; 756 else 757 firstlen = paylen + overlen; 758 759 if (debug) { 760 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 761 "fraglen %d overlen %d len %d rate %d flags %08x\n", 762 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 763 overlen, len, rate, flags); 764 } 765 766 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 767 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 768 769 rc = ieee80211_compute_duration1(firstlen + hdrlen, 770 ack, flags, rate, d0); 771 if (rc == -1) 772 return rc; 773 774 if (npkt <= 1) { 775 *dn = *d0; 776 return 0; 777 } 778 return ieee80211_compute_duration1(lastlen + hdrlen, ack, flags, rate, 779 dn); 780 } 781 782 /* 783 * Add a supported rates element id to a frame. 784 */ 785 static u_int8_t * 786 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 787 { 788 int nrates; 789 790 *frm++ = IEEE80211_ELEMID_RATES; 791 nrates = rs->rs_nrates; 792 if (nrates > IEEE80211_RATE_SIZE) 793 nrates = IEEE80211_RATE_SIZE; 794 *frm++ = nrates; 795 memcpy(frm, rs->rs_rates, nrates); 796 return frm + nrates; 797 } 798 799 /* 800 * Add an extended supported rates element id to a frame. 801 */ 802 static u_int8_t * 803 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 804 { 805 /* 806 * Add an extended supported rates element if operating in 11g mode. 807 */ 808 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 809 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 810 *frm++ = IEEE80211_ELEMID_XRATES; 811 *frm++ = nrates; 812 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 813 frm += nrates; 814 } 815 return frm; 816 } 817 818 /* 819 * Add an ssid elemet to a frame. 820 */ 821 static u_int8_t * 822 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 823 { 824 *frm++ = IEEE80211_ELEMID_SSID; 825 *frm++ = len; 826 memcpy(frm, ssid, len); 827 return frm + len; 828 } 829 830 /* 831 * Add an erp element to a frame. 832 */ 833 static u_int8_t * 834 ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 835 { 836 u_int8_t erp; 837 838 *frm++ = IEEE80211_ELEMID_ERP; 839 *frm++ = 1; 840 erp = 0; 841 if (ic->ic_nonerpsta != 0) 842 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 843 if (ic->ic_flags & IEEE80211_F_USEPROT) 844 erp |= IEEE80211_ERP_USE_PROTECTION; 845 if (ic->ic_flags & IEEE80211_F_USEBARKER) 846 erp |= IEEE80211_ERP_LONG_PREAMBLE; 847 *frm++ = erp; 848 return frm; 849 } 850 851 static u_int8_t * 852 ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 853 { 854 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 855 #define ADDSHORT(frm, v) do { \ 856 frm[0] = (v) & 0xff; \ 857 frm[1] = (v) >> 8; \ 858 frm += 2; \ 859 } while (0) 860 #define ADDSELECTOR(frm, sel) do { \ 861 memcpy(frm, sel, 4); \ 862 frm += 4; \ 863 } while (0) 864 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 865 static const u_int8_t cipher_suite[][4] = { 866 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 867 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 868 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 869 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 870 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 871 { WPA_OUI_BYTES, WPA_CSE_NULL }, 872 }; 873 static const u_int8_t wep104_suite[4] = 874 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 875 static const u_int8_t key_mgt_unspec[4] = 876 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 877 static const u_int8_t key_mgt_psk[4] = 878 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 879 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 880 u_int8_t *frm = ie; 881 u_int8_t *selcnt; 882 883 *frm++ = IEEE80211_ELEMID_VENDOR; 884 *frm++ = 0; /* length filled in below */ 885 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 886 frm += sizeof(oui); 887 ADDSHORT(frm, WPA_VERSION); 888 889 /* XXX filter out CKIP */ 890 891 /* multicast cipher */ 892 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 893 rsn->rsn_mcastkeylen >= 13) 894 ADDSELECTOR(frm, wep104_suite); 895 else 896 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 897 898 /* unicast cipher list */ 899 selcnt = frm; 900 ADDSHORT(frm, 0); /* selector count */ 901 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 902 selcnt[0]++; 903 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 904 } 905 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 906 selcnt[0]++; 907 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 908 } 909 910 /* authenticator selector list */ 911 selcnt = frm; 912 ADDSHORT(frm, 0); /* selector count */ 913 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 914 selcnt[0]++; 915 ADDSELECTOR(frm, key_mgt_unspec); 916 } 917 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 918 selcnt[0]++; 919 ADDSELECTOR(frm, key_mgt_psk); 920 } 921 922 /* optional capabilities */ 923 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 924 ADDSHORT(frm, rsn->rsn_caps); 925 926 /* calculate element length */ 927 ie[1] = frm - ie - 2; 928 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 929 ("WPA IE too big, %u > %zu", 930 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 931 return frm; 932 #undef ADDSHORT 933 #undef ADDSELECTOR 934 #undef WPA_OUI_BYTES 935 } 936 937 static u_int8_t * 938 ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 939 { 940 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 941 #define ADDSHORT(frm, v) do { \ 942 frm[0] = (v) & 0xff; \ 943 frm[1] = (v) >> 8; \ 944 frm += 2; \ 945 } while (0) 946 #define ADDSELECTOR(frm, sel) do { \ 947 memcpy(frm, sel, 4); \ 948 frm += 4; \ 949 } while (0) 950 static const u_int8_t cipher_suite[][4] = { 951 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 952 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 953 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 954 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 955 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 956 { RSN_OUI_BYTES, RSN_CSE_NULL }, 957 }; 958 static const u_int8_t wep104_suite[4] = 959 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 960 static const u_int8_t key_mgt_unspec[4] = 961 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 962 static const u_int8_t key_mgt_psk[4] = 963 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 964 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 965 u_int8_t *frm = ie; 966 u_int8_t *selcnt; 967 968 *frm++ = IEEE80211_ELEMID_RSN; 969 *frm++ = 0; /* length filled in below */ 970 ADDSHORT(frm, RSN_VERSION); 971 972 /* XXX filter out CKIP */ 973 974 /* multicast cipher */ 975 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 976 rsn->rsn_mcastkeylen >= 13) 977 ADDSELECTOR(frm, wep104_suite); 978 else 979 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 980 981 /* unicast cipher list */ 982 selcnt = frm; 983 ADDSHORT(frm, 0); /* selector count */ 984 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 985 selcnt[0]++; 986 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 987 } 988 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 989 selcnt[0]++; 990 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 991 } 992 993 /* authenticator selector list */ 994 selcnt = frm; 995 ADDSHORT(frm, 0); /* selector count */ 996 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 997 selcnt[0]++; 998 ADDSELECTOR(frm, key_mgt_unspec); 999 } 1000 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 1001 selcnt[0]++; 1002 ADDSELECTOR(frm, key_mgt_psk); 1003 } 1004 1005 /* optional capabilities */ 1006 ADDSHORT(frm, rsn->rsn_caps); 1007 /* XXX PMKID */ 1008 1009 /* calculate element length */ 1010 ie[1] = frm - ie - 2; 1011 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1012 ("RSN IE too big, %u > %zu", 1013 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1014 return frm; 1015 #undef ADDSELECTOR 1016 #undef ADDSHORT 1017 #undef RSN_OUI_BYTES 1018 } 1019 1020 /* 1021 * Add a WPA/RSN element to a frame. 1022 */ 1023 static u_int8_t * 1024 ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 1025 { 1026 1027 IASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 1028 if (ic->ic_flags & IEEE80211_F_WPA2) 1029 frm = ieee80211_setup_rsn_ie(ic, frm); 1030 if (ic->ic_flags & IEEE80211_F_WPA1) 1031 frm = ieee80211_setup_wpa_ie(ic, frm); 1032 return frm; 1033 } 1034 1035 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1036 /* 1037 * Add a WME information element to a frame. 1038 */ 1039 static u_int8_t * 1040 ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 1041 { 1042 static const struct ieee80211_wme_info info = { 1043 .wme_id = IEEE80211_ELEMID_VENDOR, 1044 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1045 .wme_oui = { WME_OUI_BYTES }, 1046 .wme_type = WME_OUI_TYPE, 1047 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1048 .wme_version = WME_VERSION, 1049 .wme_info = 0, 1050 }; 1051 memcpy(frm, &info, sizeof(info)); 1052 return frm + sizeof(info); 1053 } 1054 1055 /* 1056 * Add a WME parameters element to a frame. 1057 */ 1058 static u_int8_t * 1059 ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 1060 { 1061 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1062 #define ADDSHORT(frm, v) do { \ 1063 frm[0] = (v) & 0xff; \ 1064 frm[1] = (v) >> 8; \ 1065 frm += 2; \ 1066 } while (0) 1067 /* NB: this works 'cuz a param has an info at the front */ 1068 static const struct ieee80211_wme_info param = { 1069 .wme_id = IEEE80211_ELEMID_VENDOR, 1070 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1071 .wme_oui = { WME_OUI_BYTES }, 1072 .wme_type = WME_OUI_TYPE, 1073 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1074 .wme_version = WME_VERSION, 1075 }; 1076 int i; 1077 1078 memcpy(frm, ¶m, sizeof(param)); 1079 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1080 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1081 *frm++ = 0; /* reserved field */ 1082 for (i = 0; i < WME_NUM_AC; i++) { 1083 const struct wmeParams *ac = 1084 &wme->wme_bssChanParams.cap_wmeParams[i]; 1085 *frm++ = SM(i, WME_PARAM_ACI) 1086 | SM(ac->wmep_acm, WME_PARAM_ACM) 1087 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1088 ; 1089 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1090 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1091 ; 1092 ADDSHORT(frm, ac->wmep_txopLimit); 1093 } 1094 return frm; 1095 #undef SM 1096 #undef ADDSHORT 1097 } 1098 #undef WME_OUI_BYTES 1099 1100 /* 1101 * Send a management frame. The node is for the destination (or ic_bss 1102 * when in station mode). Nodes other than ic_bss have their reference 1103 * count bumped to reflect our use for an indeterminant time. 1104 */ 1105 int 1106 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1107 int type, int arg) 1108 { 1109 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1110 struct mbuf *m; 1111 u_int8_t *frm; 1112 enum ieee80211_phymode mode; 1113 u_int16_t capinfo; 1114 int has_challenge, is_shared_key, ret, timer, status; 1115 1116 IASSERT(ni != NULL, ("null node")); 1117 1118 /* 1119 * Hold a reference on the node so it doesn't go away until after 1120 * the xmit is complete all the way in the driver. On error we 1121 * will remove our reference. 1122 */ 1123 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1124 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1125 __func__, __LINE__, 1126 ni, ether_sprintf(ni->ni_macaddr), 1127 ieee80211_node_refcnt(ni)+1); 1128 ieee80211_ref_node(ni); 1129 1130 timer = 0; 1131 switch (type) { 1132 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1133 /* 1134 * prreq frame format 1135 * [tlv] ssid 1136 * [tlv] supported rates 1137 * [tlv] extended supported rates 1138 * [tlv] user-specified ie's 1139 */ 1140 m = ieee80211_getmgtframe(&frm, 1141 2 + IEEE80211_NWID_LEN 1142 + 2 + IEEE80211_RATE_SIZE 1143 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1144 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1145 ); 1146 if (m == NULL) 1147 senderr(ENOMEM, is_tx_nobuf); 1148 1149 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 1150 mode = ieee80211_chan2mode(ic, ni->ni_chan); 1151 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1152 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1153 if (ic->ic_opt_ie != NULL) { 1154 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1155 frm += ic->ic_opt_ie_len; 1156 } 1157 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1158 1159 IEEE80211_NODE_STAT(ni, tx_probereq); 1160 if (ic->ic_opmode == IEEE80211_M_STA) 1161 timer = IEEE80211_TRANS_WAIT; 1162 break; 1163 1164 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1165 /* 1166 * probe response frame format 1167 * [8] time stamp 1168 * [2] beacon interval 1169 * [2] cabability information 1170 * [tlv] ssid 1171 * [tlv] supported rates 1172 * [tlv] parameter set (FH/DS) 1173 * [tlv] parameter set (IBSS) 1174 * [tlv] extended rate phy (ERP) 1175 * [tlv] extended supported rates 1176 * [tlv] WPA 1177 * [tlv] WME (optional) 1178 */ 1179 m = ieee80211_getmgtframe(&frm, 1180 8 1181 + sizeof(u_int16_t) 1182 + sizeof(u_int16_t) 1183 + 2 + IEEE80211_NWID_LEN 1184 + 2 + IEEE80211_RATE_SIZE 1185 + 7 /* max(7,3) */ 1186 + 6 1187 + 3 1188 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1189 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1190 + (ic->ic_flags & IEEE80211_F_WPA ? 1191 2*sizeof(struct ieee80211_ie_wpa) : 0) 1192 + sizeof(struct ieee80211_wme_param) 1193 ); 1194 if (m == NULL) 1195 senderr(ENOMEM, is_tx_nobuf); 1196 1197 memset(frm, 0, 8); /* timestamp should be filled later */ 1198 frm += 8; 1199 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1200 frm += 2; 1201 if (ic->ic_opmode == IEEE80211_M_IBSS) 1202 capinfo = IEEE80211_CAPINFO_IBSS; 1203 else 1204 capinfo = IEEE80211_CAPINFO_ESS; 1205 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1206 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1207 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1208 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1209 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1210 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1211 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1212 *(u_int16_t *)frm = htole16(capinfo); 1213 frm += 2; 1214 1215 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1216 ic->ic_bss->ni_esslen); 1217 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1218 1219 if (ic->ic_phytype == IEEE80211_T_FH) { 1220 *frm++ = IEEE80211_ELEMID_FHPARMS; 1221 *frm++ = 5; 1222 *frm++ = ni->ni_fhdwell & 0x00ff; 1223 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1224 *frm++ = IEEE80211_FH_CHANSET( 1225 ieee80211_chan2ieee(ic, ni->ni_chan)); 1226 *frm++ = IEEE80211_FH_CHANPAT( 1227 ieee80211_chan2ieee(ic, ni->ni_chan)); 1228 *frm++ = ni->ni_fhindex; 1229 } else { 1230 *frm++ = IEEE80211_ELEMID_DSPARMS; 1231 *frm++ = 1; 1232 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1233 } 1234 1235 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1236 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1237 *frm++ = 2; 1238 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1239 } 1240 if (ic->ic_flags & IEEE80211_F_WPA) 1241 frm = ieee80211_add_wpa(frm, ic); 1242 if (ic->ic_curmode == IEEE80211_MODE_11G) 1243 frm = ieee80211_add_erp(frm, ic); 1244 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1245 if (ic->ic_flags & IEEE80211_F_WME) 1246 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1247 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1248 break; 1249 1250 case IEEE80211_FC0_SUBTYPE_AUTH: 1251 status = arg >> 16; 1252 arg &= 0xffff; 1253 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1254 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1255 ni->ni_challenge != NULL); 1256 1257 /* 1258 * Deduce whether we're doing open authentication or 1259 * shared key authentication. We do the latter if 1260 * we're in the middle of a shared key authentication 1261 * handshake or if we're initiating an authentication 1262 * request and configured to use shared key. 1263 */ 1264 is_shared_key = has_challenge || 1265 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1266 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1267 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1268 1269 m = ieee80211_getmgtframe(&frm, 1270 3 * sizeof(u_int16_t) 1271 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1272 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1273 ); 1274 if (m == NULL) 1275 senderr(ENOMEM, is_tx_nobuf); 1276 1277 ((u_int16_t *)frm)[0] = 1278 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1279 : htole16(IEEE80211_AUTH_ALG_OPEN); 1280 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1281 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1282 1283 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1284 ((u_int16_t *)frm)[3] = 1285 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1286 IEEE80211_ELEMID_CHALLENGE); 1287 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1288 IEEE80211_CHALLENGE_LEN); 1289 m->m_pkthdr.len = m->m_len = 1290 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1291 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1292 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1293 "[%s] request encrypt frame (%s)\n", 1294 ether_sprintf(ni->ni_macaddr), __func__); 1295 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1296 } 1297 } else 1298 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1299 1300 /* XXX not right for shared key */ 1301 if (status == IEEE80211_STATUS_SUCCESS) 1302 IEEE80211_NODE_STAT(ni, tx_auth); 1303 else 1304 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1305 1306 if (ic->ic_opmode == IEEE80211_M_STA) 1307 timer = IEEE80211_TRANS_WAIT; 1308 break; 1309 1310 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1311 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1312 "[%s] send station deauthenticate (reason %d)\n", 1313 ether_sprintf(ni->ni_macaddr), arg); 1314 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1315 if (m == NULL) 1316 senderr(ENOMEM, is_tx_nobuf); 1317 *(u_int16_t *)frm = htole16(arg); /* reason */ 1318 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1319 1320 IEEE80211_NODE_STAT(ni, tx_deauth); 1321 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1322 1323 ieee80211_node_unauthorize(ic, ni); /* port closed */ 1324 break; 1325 1326 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1327 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1328 /* 1329 * asreq frame format 1330 * [2] capability information 1331 * [2] listen interval 1332 * [6*] current AP address (reassoc only) 1333 * [tlv] ssid 1334 * [tlv] supported rates 1335 * [tlv] extended supported rates 1336 * [tlv] WME 1337 * [tlv] user-specified ie's 1338 */ 1339 m = ieee80211_getmgtframe(&frm, 1340 sizeof(u_int16_t) 1341 + sizeof(u_int16_t) 1342 + IEEE80211_ADDR_LEN 1343 + 2 + IEEE80211_NWID_LEN 1344 + 2 + IEEE80211_RATE_SIZE 1345 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1346 + sizeof(struct ieee80211_wme_info) 1347 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1348 ); 1349 if (m == NULL) 1350 senderr(ENOMEM, is_tx_nobuf); 1351 1352 capinfo = 0; 1353 if (ic->ic_opmode == IEEE80211_M_IBSS) 1354 capinfo |= IEEE80211_CAPINFO_IBSS; 1355 else /* IEEE80211_M_STA */ 1356 capinfo |= IEEE80211_CAPINFO_ESS; 1357 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1358 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1359 /* 1360 * NB: Some 11a AP's reject the request when 1361 * short premable is set. 1362 */ 1363 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1364 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1365 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1366 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1367 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1368 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1369 *(u_int16_t *)frm = htole16(capinfo); 1370 frm += 2; 1371 1372 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1373 frm += 2; 1374 1375 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1376 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1377 frm += IEEE80211_ADDR_LEN; 1378 } 1379 1380 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1381 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1382 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1383 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1384 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1385 if (ic->ic_opt_ie != NULL) { 1386 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1387 frm += ic->ic_opt_ie_len; 1388 } 1389 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1390 1391 timer = IEEE80211_TRANS_WAIT; 1392 break; 1393 1394 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1395 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1396 /* 1397 * asreq frame format 1398 * [2] capability information 1399 * [2] status 1400 * [2] association ID 1401 * [tlv] supported rates 1402 * [tlv] extended supported rates 1403 * [tlv] WME (if enabled and STA enabled) 1404 */ 1405 m = ieee80211_getmgtframe(&frm, 1406 sizeof(u_int16_t) 1407 + sizeof(u_int16_t) 1408 + sizeof(u_int16_t) 1409 + 2 + IEEE80211_RATE_SIZE 1410 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1411 + sizeof(struct ieee80211_wme_param) 1412 ); 1413 if (m == NULL) 1414 senderr(ENOMEM, is_tx_nobuf); 1415 1416 capinfo = IEEE80211_CAPINFO_ESS; 1417 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1418 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1419 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1420 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1421 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1422 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1423 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1424 *(u_int16_t *)frm = htole16(capinfo); 1425 frm += 2; 1426 1427 *(u_int16_t *)frm = htole16(arg); /* status */ 1428 frm += 2; 1429 1430 if (arg == IEEE80211_STATUS_SUCCESS) { 1431 *(u_int16_t *)frm = htole16(ni->ni_associd); 1432 IEEE80211_NODE_STAT(ni, tx_assoc); 1433 } else 1434 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1435 frm += 2; 1436 1437 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1438 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1439 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1440 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1441 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1442 break; 1443 1444 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1445 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1446 "[%s] send station disassociate (reason %d)\n", 1447 ether_sprintf(ni->ni_macaddr), arg); 1448 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1449 if (m == NULL) 1450 senderr(ENOMEM, is_tx_nobuf); 1451 *(u_int16_t *)frm = htole16(arg); /* reason */ 1452 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1453 1454 IEEE80211_NODE_STAT(ni, tx_disassoc); 1455 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1456 break; 1457 1458 default: 1459 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1460 "[%s] invalid mgmt frame type %u\n", 1461 ether_sprintf(ni->ni_macaddr), type); 1462 senderr(EINVAL, is_tx_unknownmgt); 1463 /* NOTREACHED */ 1464 } 1465 1466 ret = ieee80211_mgmt_output(ic, ni, m, type); 1467 if (ret == 0) { 1468 if (timer) 1469 ic->ic_mgt_timer = timer; 1470 } else { 1471 bad: 1472 ieee80211_free_node(ni); 1473 } 1474 return ret; 1475 #undef senderr 1476 } 1477 1478 /* 1479 * Allocate a beacon frame and fillin the appropriate bits. 1480 */ 1481 struct mbuf * 1482 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1483 struct ieee80211_beacon_offsets *bo) 1484 { 1485 struct ifnet *ifp = ic->ic_ifp; 1486 struct ieee80211_frame *wh; 1487 struct mbuf *m; 1488 int pktlen; 1489 u_int8_t *frm, *efrm; 1490 u_int16_t capinfo; 1491 struct ieee80211_rateset *rs; 1492 1493 /* 1494 * beacon frame format 1495 * [8] time stamp 1496 * [2] beacon interval 1497 * [2] cabability information 1498 * [tlv] ssid 1499 * [tlv] supported rates 1500 * [3] parameter set (DS) 1501 * [tlv] parameter set (IBSS/TIM) 1502 * [tlv] extended rate phy (ERP) 1503 * [tlv] extended supported rates 1504 * [tlv] WME parameters 1505 * [tlv] WPA/RSN parameters 1506 * XXX Vendor-specific OIDs (e.g. Atheros) 1507 * NB: we allocate the max space required for the TIM bitmap. 1508 */ 1509 rs = &ni->ni_rates; 1510 pktlen = 8 /* time stamp */ 1511 + sizeof(u_int16_t) /* beacon interval */ 1512 + sizeof(u_int16_t) /* capabilities */ 1513 + 2 + ni->ni_esslen /* ssid */ 1514 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1515 + 2 + 1 /* DS parameters */ 1516 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1517 + 2 + 1 /* ERP */ 1518 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1519 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1520 sizeof(struct ieee80211_wme_param) : 0) 1521 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1522 2*sizeof(struct ieee80211_ie_wpa) : 0) 1523 ; 1524 m = ieee80211_getmgtframe(&frm, pktlen); 1525 if (m == NULL) { 1526 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1527 "%s: cannot get buf; size %u\n", __func__, pktlen); 1528 ic->ic_stats.is_tx_nobuf++; 1529 return NULL; 1530 } 1531 1532 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1533 frm += 8; 1534 *(u_int16_t *)frm = htole16(ni->ni_intval); 1535 frm += 2; 1536 if (ic->ic_opmode == IEEE80211_M_IBSS) 1537 capinfo = IEEE80211_CAPINFO_IBSS; 1538 else 1539 capinfo = IEEE80211_CAPINFO_ESS; 1540 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1541 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1542 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1543 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1544 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1545 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1546 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1547 bo->bo_caps = (u_int16_t *)frm; 1548 *(u_int16_t *)frm = htole16(capinfo); 1549 frm += 2; 1550 *frm++ = IEEE80211_ELEMID_SSID; 1551 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1552 *frm++ = ni->ni_esslen; 1553 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1554 frm += ni->ni_esslen; 1555 } else 1556 *frm++ = 0; 1557 frm = ieee80211_add_rates(frm, rs); 1558 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1559 *frm++ = IEEE80211_ELEMID_DSPARMS; 1560 *frm++ = 1; 1561 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1562 } 1563 bo->bo_tim = frm; 1564 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1565 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1566 *frm++ = 2; 1567 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1568 bo->bo_tim_len = 0; 1569 } else { 1570 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1571 1572 tie->tim_ie = IEEE80211_ELEMID_TIM; 1573 tie->tim_len = 4; /* length */ 1574 tie->tim_count = 0; /* DTIM count */ 1575 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1576 tie->tim_bitctl = 0; /* bitmap control */ 1577 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1578 frm += sizeof(struct ieee80211_tim_ie); 1579 bo->bo_tim_len = 1; 1580 } 1581 bo->bo_trailer = frm; 1582 if (ic->ic_flags & IEEE80211_F_WME) { 1583 bo->bo_wme = frm; 1584 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1585 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1586 } 1587 if (ic->ic_flags & IEEE80211_F_WPA) 1588 frm = ieee80211_add_wpa(frm, ic); 1589 if (ic->ic_curmode == IEEE80211_MODE_11G) 1590 frm = ieee80211_add_erp(frm, ic); 1591 efrm = ieee80211_add_xrates(frm, rs); 1592 bo->bo_trailer_len = efrm - bo->bo_trailer; 1593 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1594 1595 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1596 IASSERT(m != NULL, ("no space for 802.11 header?")); 1597 wh = mtod(m, struct ieee80211_frame *); 1598 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1599 IEEE80211_FC0_SUBTYPE_BEACON; 1600 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1601 *(u_int16_t *)wh->i_dur = 0; 1602 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1603 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1604 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1605 *(u_int16_t *)wh->i_seq = 0; 1606 1607 return m; 1608 } 1609 1610 /* 1611 * Update the dynamic parts of a beacon frame based on the current state. 1612 */ 1613 int 1614 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1615 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1616 { 1617 int len_changed = 0; 1618 u_int16_t capinfo; 1619 1620 IEEE80211_BEACON_LOCK(ic); 1621 /* XXX faster to recalculate entirely or just changes? */ 1622 if (ic->ic_opmode == IEEE80211_M_IBSS) 1623 capinfo = IEEE80211_CAPINFO_IBSS; 1624 else 1625 capinfo = IEEE80211_CAPINFO_ESS; 1626 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1627 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1628 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1629 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1630 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1631 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1632 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1633 *bo->bo_caps = htole16(capinfo); 1634 1635 if (ic->ic_flags & IEEE80211_F_WME) { 1636 struct ieee80211_wme_state *wme = &ic->ic_wme; 1637 1638 /* 1639 * Check for agressive mode change. When there is 1640 * significant high priority traffic in the BSS 1641 * throttle back BE traffic by using conservative 1642 * parameters. Otherwise BE uses agressive params 1643 * to optimize performance of legacy/non-QoS traffic. 1644 */ 1645 if (wme->wme_flags & WME_F_AGGRMODE) { 1646 if (wme->wme_hipri_traffic > 1647 wme->wme_hipri_switch_thresh) { 1648 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1649 "%s: traffic %u, disable aggressive mode\n", 1650 __func__, wme->wme_hipri_traffic); 1651 wme->wme_flags &= ~WME_F_AGGRMODE; 1652 ieee80211_wme_updateparams_locked(ic); 1653 wme->wme_hipri_traffic = 1654 wme->wme_hipri_switch_hysteresis; 1655 } else 1656 wme->wme_hipri_traffic = 0; 1657 } else { 1658 if (wme->wme_hipri_traffic <= 1659 wme->wme_hipri_switch_thresh) { 1660 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1661 "%s: traffic %u, enable aggressive mode\n", 1662 __func__, wme->wme_hipri_traffic); 1663 wme->wme_flags |= WME_F_AGGRMODE; 1664 ieee80211_wme_updateparams_locked(ic); 1665 wme->wme_hipri_traffic = 0; 1666 } else 1667 wme->wme_hipri_traffic = 1668 wme->wme_hipri_switch_hysteresis; 1669 } 1670 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1671 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1672 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1673 } 1674 } 1675 1676 #ifndef IEEE80211_NO_HOSTAP 1677 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1678 struct ieee80211_tim_ie *tie = 1679 (struct ieee80211_tim_ie *) bo->bo_tim; 1680 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1681 u_int timlen, timoff, i; 1682 /* 1683 * ATIM/DTIM needs updating. If it fits in the 1684 * current space allocated then just copy in the 1685 * new bits. Otherwise we need to move any trailing 1686 * data to make room. Note that we know there is 1687 * contiguous space because ieee80211_beacon_allocate 1688 * insures there is space in the mbuf to write a 1689 * maximal-size virtual bitmap (based on ic_max_aid). 1690 */ 1691 /* 1692 * Calculate the bitmap size and offset, copy any 1693 * trailer out of the way, and then copy in the 1694 * new bitmap and update the information element. 1695 * Note that the tim bitmap must contain at least 1696 * one byte and any offset must be even. 1697 */ 1698 if (ic->ic_ps_pending != 0) { 1699 timoff = 128; /* impossibly large */ 1700 for (i = 0; i < ic->ic_tim_len; i++) 1701 if (ic->ic_tim_bitmap[i]) { 1702 timoff = i &~ 1; 1703 break; 1704 } 1705 IASSERT(timoff != 128, ("tim bitmap empty!")); 1706 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1707 if (ic->ic_tim_bitmap[i]) 1708 break; 1709 timlen = 1 + (i - timoff); 1710 } else { 1711 timoff = 0; 1712 timlen = 1; 1713 } 1714 if (timlen != bo->bo_tim_len) { 1715 /* copy up/down trailer */ 1716 ovbcopy(bo->bo_trailer, tie->tim_bitmap+timlen, 1717 bo->bo_trailer_len); 1718 bo->bo_trailer = tie->tim_bitmap+timlen; 1719 bo->bo_wme = bo->bo_trailer; 1720 bo->bo_tim_len = timlen; 1721 1722 /* update information element */ 1723 tie->tim_len = 3 + timlen; 1724 tie->tim_bitctl = timoff; 1725 len_changed = 1; 1726 } 1727 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1728 bo->bo_tim_len); 1729 1730 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1731 1732 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1733 "%s: TIM updated, pending %u, off %u, len %u\n", 1734 __func__, ic->ic_ps_pending, timoff, timlen); 1735 } 1736 /* count down DTIM period */ 1737 if (tie->tim_count == 0) 1738 tie->tim_count = tie->tim_period - 1; 1739 else 1740 tie->tim_count--; 1741 /* update state for buffered multicast frames on DTIM */ 1742 if (mcast && (tie->tim_count == 1 || tie->tim_period == 1)) 1743 tie->tim_bitctl |= 1; 1744 else 1745 tie->tim_bitctl &= ~1; 1746 } 1747 #endif /* !IEEE80211_NO_HOSTAP */ 1748 IEEE80211_BEACON_UNLOCK(ic); 1749 1750 return len_changed; 1751 } 1752 1753 /* 1754 * Save an outbound packet for a node in power-save sleep state. 1755 * The new packet is placed on the node's saved queue, and the TIM 1756 * is changed, if necessary. 1757 */ 1758 void 1759 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1760 struct mbuf *m) 1761 { 1762 int qlen, age; 1763 1764 IEEE80211_NODE_SAVEQ_LOCK(ni); 1765 if (IF_QFULL(&ni->ni_savedq)) { 1766 IF_DROP(&ni->ni_savedq); 1767 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1768 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1769 "[%s] pwr save q overflow, drops %d (size %d)\n", 1770 ether_sprintf(ni->ni_macaddr), 1771 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1772 #ifdef IEEE80211_DEBUG 1773 if (ieee80211_msg_dumppkts(ic)) 1774 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1775 #endif 1776 m_freem(m); 1777 return; 1778 } 1779 /* 1780 * Tag the frame with it's expiry time and insert 1781 * it in the queue. The aging interval is 4 times 1782 * the listen interval specified by the station. 1783 * Frames that sit around too long are reclaimed 1784 * using this information. 1785 */ 1786 /* XXX handle overflow? */ 1787 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */ 1788 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1789 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1790 1791 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1792 "[%s] save frame, %u now queued\n", 1793 ether_sprintf(ni->ni_macaddr), qlen); 1794 1795 if (qlen == 1) 1796 ic->ic_set_tim(ic, ni, 1); 1797 } 1798