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 * $FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.26.2.7 2006/03/23 23:28:43 sam Exp $ 33 * $DragonFly: src/sys/netproto/802_11/wlan/ieee80211_output.c,v 1.2 2006/05/18 13:51:46 sephe Exp $ 34 */ 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_arp.h> 50 #include <net/if_llc.h> 51 #include <net/if_media.h> 52 #include <net/vlan/if_vlan_var.h> 53 54 #include <netproto/802_11/ieee80211_var.h> 55 56 #ifdef INET 57 #include <netinet/in.h> 58 #include <netinet/if_ether.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #endif 62 63 #ifdef IEEE80211_DEBUG 64 /* 65 * Decide if an outbound management frame should be 66 * printed when debugging is enabled. This filters some 67 * of the less interesting frames that come frequently 68 * (e.g. beacons). 69 */ 70 static __inline int 71 doprint(struct ieee80211com *ic, int subtype) 72 { 73 switch (subtype) { 74 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 75 return (ic->ic_opmode == IEEE80211_M_IBSS); 76 } 77 return 1; 78 } 79 #endif 80 81 /* 82 * Set the direction field and address fields of an outgoing 83 * non-QoS frame. Note this should be called early on in 84 * constructing a frame as it sets i_fc[1]; other bits can 85 * then be or'd in. 86 */ 87 static void 88 ieee80211_send_setup(struct ieee80211com *ic, 89 struct ieee80211_node *ni, 90 struct ieee80211_frame *wh, 91 int type, 92 const uint8_t sa[IEEE80211_ADDR_LEN], 93 const uint8_t da[IEEE80211_ADDR_LEN], 94 const uint8_t bssid[IEEE80211_ADDR_LEN]) 95 { 96 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 97 98 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 99 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 100 switch (ic->ic_opmode) { 101 case IEEE80211_M_STA: 102 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 103 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 104 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 105 IEEE80211_ADDR_COPY(wh->i_addr3, da); 106 break; 107 case IEEE80211_M_IBSS: 108 case IEEE80211_M_AHDEMO: 109 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 110 IEEE80211_ADDR_COPY(wh->i_addr1, da); 111 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 112 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 113 break; 114 case IEEE80211_M_HOSTAP: 115 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 116 IEEE80211_ADDR_COPY(wh->i_addr1, da); 117 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 118 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 119 break; 120 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 121 break; 122 } 123 } else { 124 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 125 IEEE80211_ADDR_COPY(wh->i_addr1, da); 126 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 127 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 128 } 129 *(uint16_t *)&wh->i_dur[0] = 0; 130 /* NB: use non-QoS tid */ 131 *(uint16_t *)&wh->i_seq[0] = 132 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 133 ni->ni_txseqs[0]++; 134 #undef WH4 135 } 136 137 /* 138 * Send a management frame to the specified node. The node pointer 139 * must have a reference as the pointer will be passed to the driver 140 * and potentially held for a long time. If the frame is successfully 141 * dispatched to the driver, then it is responsible for freeing the 142 * reference (and potentially free'ing up any associated storage). 143 */ 144 static int 145 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 146 struct mbuf *m, int type, int timer) 147 { 148 struct ifnet *ifp = ic->ic_ifp; 149 struct ieee80211_frame *wh; 150 151 KASSERT(ni != NULL, ("null node")); 152 153 /* 154 * Yech, hack alert! We want to pass the node down to the 155 * driver's start routine. If we don't do so then the start 156 * routine must immediately look it up again and that can 157 * cause a lock order reversal if, for example, this frame 158 * is being sent because the station is being timedout and 159 * the frame being sent is a DEAUTH message. We could stick 160 * this in an m_tag and tack that on to the mbuf. However 161 * that's rather expensive to do for every frame so instead 162 * we stuff it in the rcvif field since outbound frames do 163 * not (presently) use this. 164 */ 165 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 166 if (m == NULL) 167 return ENOMEM; 168 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 169 m->m_pkthdr.rcvif = (void *)ni; 170 171 wh = mtod(m, struct ieee80211_frame *); 172 ieee80211_send_setup(ic, ni, wh, 173 IEEE80211_FC0_TYPE_MGT | type, 174 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 175 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 176 m->m_flags &= ~M_LINK0; 177 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 178 "[%6D] encrypting frame (%s)\n", 179 wh->i_addr1, ":", __func__); 180 wh->i_fc[1] |= IEEE80211_FC1_WEP; 181 } 182 #ifdef IEEE80211_DEBUG 183 /* avoid printing too many frames */ 184 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 185 ieee80211_msg_dumppkts(ic)) { 186 printf("[%6D] send %s on channel %u\n", 187 wh->i_addr1, ":", 188 ieee80211_mgt_subtype_name[ 189 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 190 IEEE80211_FC0_SUBTYPE_SHIFT], 191 ieee80211_chan2ieee(ic, ic->ic_curchan)); 192 } 193 #endif 194 IEEE80211_NODE_STAT(ni, tx_mgmt); 195 IF_ENQUEUE(&ic->ic_mgtq, m); 196 if (timer) { 197 /* 198 * Set the mgt frame timeout. 199 */ 200 ic->ic_mgt_timer = timer; 201 ifp->if_timer = 1; 202 } 203 ifp->if_start(ifp); 204 return 0; 205 } 206 207 /* 208 * Send a null data frame to the specified node. 209 * 210 * NB: the caller is assumed to have setup a node reference 211 * for use; this is necessary to deal with a race condition 212 * when probing for inactive stations. 213 */ 214 int 215 ieee80211_send_nulldata(struct ieee80211_node *ni) 216 { 217 struct ieee80211com *ic = ni->ni_ic; 218 struct ifnet *ifp = ic->ic_ifp; 219 struct mbuf *m; 220 struct ieee80211_frame *wh; 221 222 MGETHDR(m, M_NOWAIT, MT_HEADER); 223 if (m == NULL) { 224 /* XXX debug msg */ 225 ic->ic_stats.is_tx_nobuf++; 226 ieee80211_unref_node(&ni); 227 return ENOMEM; 228 } 229 m->m_pkthdr.rcvif = (void *) ni; 230 231 wh = mtod(m, struct ieee80211_frame *); 232 ieee80211_send_setup(ic, ni, wh, 233 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 234 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 235 /* NB: power management bit is never sent by an AP */ 236 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 237 ic->ic_opmode != IEEE80211_M_HOSTAP) 238 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 239 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 240 241 IEEE80211_NODE_STAT(ni, tx_data); 242 243 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 244 "[%s] send null data frame on channel %u, pwr mgt %s\n", 245 ni->ni_macaddr, ":", 246 ieee80211_chan2ieee(ic, ic->ic_curchan), 247 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 248 249 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 250 ifp->if_start(ifp); 251 return 0; 252 } 253 254 /* 255 * Assign priority to a frame based on any vlan tag assigned 256 * to the station and/or any Diffserv setting in an IP header. 257 * Finally, if an ACM policy is setup (in station mode) it's 258 * applied. 259 */ 260 int 261 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 262 { 263 int v_wme_ac = 0, d_wme_ac, ac; 264 #ifdef INET 265 struct ether_header *eh; 266 #endif 267 268 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 269 ac = WME_AC_BE; 270 goto done; 271 } 272 273 #ifdef FREEBSD_VLAN 274 /* 275 * If node has a vlan tag then all traffic 276 * to it must have a matching tag. 277 */ 278 v_wme_ac = 0; 279 if (ni->ni_vlan != 0) { 280 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m); 281 if (mtag == NULL) { 282 IEEE80211_NODE_STAT(ni, tx_novlantag); 283 return 1; 284 } 285 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 286 EVL_VLANOFTAG(ni->ni_vlan)) { 287 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 288 return 1; 289 } 290 /* map vlan priority to AC */ 291 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 292 case 1: 293 case 2: 294 v_wme_ac = WME_AC_BK; 295 break; 296 case 0: 297 case 3: 298 v_wme_ac = WME_AC_BE; 299 break; 300 case 4: 301 case 5: 302 v_wme_ac = WME_AC_VI; 303 break; 304 case 6: 305 case 7: 306 v_wme_ac = WME_AC_VO; 307 break; 308 } 309 } 310 #endif /* FREEBSD_VLAN */ 311 312 #ifdef INET 313 eh = mtod(m, struct ether_header *); 314 if (eh->ether_type == htons(ETHERTYPE_IP)) { 315 const struct ip *ip = (struct ip *) 316 (mtod(m, uint8_t *) + sizeof (*eh)); 317 /* 318 * IP frame, map the TOS field. 319 */ 320 switch (ip->ip_tos) { 321 case 0x08: 322 case 0x20: 323 d_wme_ac = WME_AC_BK; /* background */ 324 break; 325 case 0x28: 326 case 0xa0: 327 d_wme_ac = WME_AC_VI; /* video */ 328 break; 329 case 0x30: /* voice */ 330 case 0xe0: 331 case 0x88: /* XXX UPSD */ 332 case 0xb8: 333 d_wme_ac = WME_AC_VO; 334 break; 335 default: 336 d_wme_ac = WME_AC_BE; 337 break; 338 } 339 } else { 340 #endif /* INET */ 341 d_wme_ac = WME_AC_BE; 342 #ifdef INET 343 } 344 #endif 345 /* 346 * Use highest priority AC. 347 */ 348 if (v_wme_ac > d_wme_ac) 349 ac = v_wme_ac; 350 else 351 ac = d_wme_ac; 352 353 /* 354 * Apply ACM policy. 355 */ 356 if (ic->ic_opmode == IEEE80211_M_STA) { 357 static const int acmap[4] = { 358 WME_AC_BK, /* WME_AC_BE */ 359 WME_AC_BK, /* WME_AC_BK */ 360 WME_AC_BE, /* WME_AC_VI */ 361 WME_AC_VI, /* WME_AC_VO */ 362 }; 363 while (ac != WME_AC_BK && 364 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 365 ac = acmap[ac]; 366 } 367 done: 368 M_WME_SETAC(m, ac); 369 return 0; 370 } 371 372 /* 373 * Insure there is sufficient contiguous space to encapsulate the 374 * 802.11 data frame. If room isn't already there, arrange for it. 375 * Drivers and cipher modules assume we have done the necessary work 376 * and fail rudely if they don't find the space they need. 377 */ 378 static struct mbuf * 379 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 380 struct ieee80211_key *key, struct mbuf *m) 381 { 382 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 383 int needed_space = hdrsize; 384 385 if (key != NULL) { 386 /* XXX belongs in crypto code? */ 387 needed_space += key->wk_cipher->ic_header; 388 /* XXX frags */ 389 /* 390 * When crypto is being done in the host we must insure 391 * the data are writable for the cipher routines; clone 392 * a writable mbuf chain. 393 * XXX handle SWMIC specially 394 */ 395 if (key->wk_flags & (IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC)) { 396 m = ieee80211_mbuf_clone(m, MB_DONTWAIT); 397 if (m == NULL) { 398 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 399 "%s: cannot get writable mbuf\n", __func__); 400 ic->ic_stats.is_tx_nobuf++; /* XXX new stat */ 401 return NULL; 402 } 403 } 404 } 405 /* 406 * We know we are called just before stripping an Ethernet 407 * header and prepending an LLC header. This means we know 408 * there will be 409 * sizeof(struct ether_header) - sizeof(struct llc) 410 * bytes recovered to which we need additional space for the 411 * 802.11 header and any crypto header. 412 */ 413 /* XXX check trailing space and copy instead? */ 414 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 415 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 416 if (n == NULL) { 417 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 418 "%s: cannot expand storage\n", __func__); 419 ic->ic_stats.is_tx_nobuf++; 420 m_freem(m); 421 return NULL; 422 } 423 KASSERT(needed_space <= MHLEN, 424 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 425 /* 426 * Setup new mbuf to have leading space to prepend the 427 * 802.11 header and any crypto header bits that are 428 * required (the latter are added when the driver calls 429 * back to ieee80211_crypto_encap to do crypto encapsulation). 430 */ 431 /* NB: must be first 'cuz it clobbers m_data */ 432 m_move_pkthdr(n, m); 433 n->m_len = 0; /* NB: m_gethdr does not set */ 434 n->m_data += needed_space; 435 /* 436 * Pull up Ethernet header to create the expected layout. 437 * We could use m_pullup but that's overkill (i.e. we don't 438 * need the actual data) and it cannot fail so do it inline 439 * for speed. 440 */ 441 /* NB: struct ether_header is known to be contiguous */ 442 n->m_len += sizeof(struct ether_header); 443 m->m_len -= sizeof(struct ether_header); 444 m->m_data += sizeof(struct ether_header); 445 /* 446 * Replace the head of the chain. 447 */ 448 n->m_next = m; 449 m = n; 450 } 451 return m; 452 #undef TO_BE_RECLAIMED 453 } 454 455 #define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none) 456 /* 457 * Return the transmit key to use in sending a unicast frame. 458 * If a unicast key is set we use that. When no unicast key is set 459 * we fall back to the default transmit key. 460 */ 461 static __inline struct ieee80211_key * 462 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 463 { 464 if (KEY_UNDEFINED(ni->ni_ucastkey)) { 465 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 466 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 467 return NULL; 468 return &ic->ic_nw_keys[ic->ic_def_txkey]; 469 } else { 470 return &ni->ni_ucastkey; 471 } 472 } 473 474 /* 475 * Return the transmit key to use in sending a multicast frame. 476 * Multicast traffic always uses the group key which is installed as 477 * the default tx key. 478 */ 479 static __inline struct ieee80211_key * 480 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 481 { 482 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 483 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 484 return NULL; 485 return &ic->ic_nw_keys[ic->ic_def_txkey]; 486 } 487 488 /* 489 * Encapsulate an outbound data frame. The mbuf chain is updated. 490 * If an error is encountered NULL is returned. The caller is required 491 * to provide a node reference and pullup the ethernet header in the 492 * first mbuf. 493 */ 494 struct mbuf * 495 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 496 struct ieee80211_node *ni) 497 { 498 struct ether_header eh; 499 struct ieee80211_frame *wh; 500 struct ieee80211_key *key; 501 struct llc *llc; 502 int hdrsize, datalen, addqos; 503 504 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 505 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 506 507 /* 508 * Insure space for additional headers. First identify 509 * transmit key to use in calculating any buffer adjustments 510 * required. This is also used below to do privacy 511 * encapsulation work. Then calculate the 802.11 header 512 * size and any padding required by the driver. 513 * 514 * Note key may be NULL if we fall back to the default 515 * transmit key and that is not set. In that case the 516 * buffer may not be expanded as needed by the cipher 517 * routines, but they will/should discard it. 518 */ 519 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 520 if (ic->ic_opmode == IEEE80211_M_STA || 521 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 522 key = ieee80211_crypto_getucastkey(ic, ni); 523 else 524 key = ieee80211_crypto_getmcastkey(ic, ni); 525 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 526 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 527 "[%6D] no default transmit key (%s) deftxkey %u\n", 528 eh.ether_dhost, ":", __func__, 529 ic->ic_def_txkey); 530 ic->ic_stats.is_tx_nodefkey++; 531 } 532 } else 533 key = NULL; 534 /* XXX 4-address format */ 535 /* 536 * XXX Some ap's don't handle QoS-encapsulated EAPOL 537 * frames so suppress use. This may be an issue if other 538 * ap's require all data frames to be QoS-encapsulated 539 * once negotiated in which case we'll need to make this 540 * configurable. 541 */ 542 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 543 eh.ether_type != htons(ETHERTYPE_PAE); 544 if (addqos) 545 hdrsize = sizeof(struct ieee80211_qosframe); 546 else 547 hdrsize = sizeof(struct ieee80211_frame); 548 if (ic->ic_flags & IEEE80211_F_DATAPAD) 549 hdrsize = roundup(hdrsize, sizeof(uint32_t)); 550 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 551 if (m == NULL) { 552 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 553 goto bad; 554 } 555 556 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 557 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 558 llc = mtod(m, struct llc *); 559 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 560 llc->llc_control = LLC_UI; 561 llc->llc_snap.org_code[0] = 0; 562 llc->llc_snap.org_code[1] = 0; 563 llc->llc_snap.org_code[2] = 0; 564 llc->llc_snap.ether_type = eh.ether_type; 565 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 566 567 M_PREPEND(m, hdrsize, MB_DONTWAIT); 568 if (m == NULL) { 569 ic->ic_stats.is_tx_nobuf++; 570 goto bad; 571 } 572 wh = mtod(m, struct ieee80211_frame *); 573 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 574 *(uint16_t *)wh->i_dur = 0; 575 switch (ic->ic_opmode) { 576 case IEEE80211_M_STA: 577 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 578 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 579 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 580 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 581 break; 582 case IEEE80211_M_IBSS: 583 case IEEE80211_M_AHDEMO: 584 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 585 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 586 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 587 /* 588 * NB: always use the bssid from ic_bss as the 589 * neighbor's may be stale after an ibss merge 590 */ 591 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 592 break; 593 case IEEE80211_M_HOSTAP: 594 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 595 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 596 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 597 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 598 break; 599 case IEEE80211_M_MONITOR: 600 goto bad; 601 } 602 if (m->m_flags & M_MORE_DATA) 603 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 604 if (addqos) { 605 struct ieee80211_qosframe *qwh = 606 (struct ieee80211_qosframe *) wh; 607 int ac, tid; 608 609 ac = M_WME_GETAC(m); 610 /* map from access class/queue to 11e header priorty value */ 611 tid = WME_AC_TO_TID(ac); 612 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 613 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 614 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 615 qwh->i_qos[1] = 0; 616 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 617 618 *(uint16_t *)wh->i_seq = 619 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 620 ni->ni_txseqs[tid]++; 621 } else { 622 *(uint16_t *)wh->i_seq = 623 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 624 ni->ni_txseqs[0]++; 625 } 626 if (key != NULL) { 627 /* 628 * IEEE 802.1X: send EAPOL frames always in the clear. 629 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 630 */ 631 if (eh.ether_type != htons(ETHERTYPE_PAE) || 632 ((ic->ic_flags & IEEE80211_F_WPA) && 633 (ic->ic_opmode == IEEE80211_M_STA ? 634 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) { 635 wh->i_fc[1] |= IEEE80211_FC1_WEP; 636 /* XXX do fragmentation */ 637 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 638 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 639 "[%6D] enmic failed, discard frame\n", 640 eh.ether_dhost, ":"); 641 ic->ic_stats.is_crypto_enmicfail++; 642 goto bad; 643 } 644 } 645 } 646 647 IEEE80211_NODE_STAT(ni, tx_data); 648 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 649 650 return m; 651 bad: 652 if (m != NULL) 653 m_freem(m); 654 return NULL; 655 } 656 657 /* 658 * Add a supported rates element id to a frame. 659 */ 660 uint8_t * 661 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 662 { 663 int nrates; 664 665 *frm++ = IEEE80211_ELEMID_RATES; 666 nrates = rs->rs_nrates; 667 if (nrates > IEEE80211_RATE_SIZE) 668 nrates = IEEE80211_RATE_SIZE; 669 *frm++ = nrates; 670 memcpy(frm, rs->rs_rates, nrates); 671 return frm + nrates; 672 } 673 674 /* 675 * Add an extended supported rates element id to a frame. 676 */ 677 uint8_t * 678 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 679 { 680 /* 681 * Add an extended supported rates element if operating in 11g mode. 682 */ 683 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 684 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 685 *frm++ = IEEE80211_ELEMID_XRATES; 686 *frm++ = nrates; 687 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 688 frm += nrates; 689 } 690 return frm; 691 } 692 693 /* 694 * Add an ssid elemet to a frame. 695 */ 696 uint8_t * 697 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 698 { 699 *frm++ = IEEE80211_ELEMID_SSID; 700 *frm++ = len; 701 memcpy(frm, ssid, len); 702 return frm + len; 703 } 704 705 /* 706 * Add an erp element to a frame. 707 */ 708 static uint8_t * 709 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 710 { 711 uint8_t erp; 712 713 *frm++ = IEEE80211_ELEMID_ERP; 714 *frm++ = 1; 715 erp = 0; 716 if (ic->ic_nonerpsta != 0) 717 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 718 if (ic->ic_flags & IEEE80211_F_USEPROT) 719 erp |= IEEE80211_ERP_USE_PROTECTION; 720 if (ic->ic_flags & IEEE80211_F_USEBARKER) 721 erp |= IEEE80211_ERP_LONG_PREAMBLE; 722 *frm++ = erp; 723 return frm; 724 } 725 726 static uint8_t * 727 ieee80211_setup_wpa_ie(struct ieee80211com *ic, uint8_t *ie) 728 { 729 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 730 #define ADDSHORT(frm, v) do { \ 731 frm[0] = (v) & 0xff; \ 732 frm[1] = (v) >> 8; \ 733 frm += 2; \ 734 } while (0) 735 #define ADDSELECTOR(frm, sel) do { \ 736 memcpy(frm, sel, 4); \ 737 frm += 4; \ 738 } while (0) 739 static const uint8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 740 static const uint8_t cipher_suite[][4] = { 741 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 742 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 743 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 744 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 745 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 746 { WPA_OUI_BYTES, WPA_CSE_NULL }, 747 }; 748 static const uint8_t wep104_suite[4] = 749 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 750 static const uint8_t key_mgt_unspec[4] = 751 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 752 static const uint8_t key_mgt_psk[4] = 753 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 754 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 755 uint8_t *frm = ie; 756 uint8_t *selcnt; 757 758 *frm++ = IEEE80211_ELEMID_VENDOR; 759 *frm++ = 0; /* length filled in below */ 760 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 761 frm += sizeof(oui); 762 ADDSHORT(frm, WPA_VERSION); 763 764 /* XXX filter out CKIP */ 765 766 /* multicast cipher */ 767 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 768 rsn->rsn_mcastkeylen >= 13) 769 ADDSELECTOR(frm, wep104_suite); 770 else 771 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 772 773 /* unicast cipher list */ 774 selcnt = frm; 775 ADDSHORT(frm, 0); /* selector count */ 776 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 777 selcnt[0]++; 778 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 779 } 780 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 781 selcnt[0]++; 782 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 783 } 784 785 /* authenticator selector list */ 786 selcnt = frm; 787 ADDSHORT(frm, 0); /* selector count */ 788 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 789 selcnt[0]++; 790 ADDSELECTOR(frm, key_mgt_unspec); 791 } 792 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 793 selcnt[0]++; 794 ADDSELECTOR(frm, key_mgt_psk); 795 } 796 797 /* optional capabilities */ 798 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 799 ADDSHORT(frm, rsn->rsn_caps); 800 801 /* calculate element length */ 802 ie[1] = frm - ie - 2; 803 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 804 ("WPA IE too big, %u > %zu", 805 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 806 return frm; 807 #undef ADDSHORT 808 #undef ADDSELECTOR 809 #undef WPA_OUI_BYTES 810 } 811 812 static uint8_t * 813 ieee80211_setup_rsn_ie(struct ieee80211com *ic, uint8_t *ie) 814 { 815 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 816 #define ADDSHORT(frm, v) do { \ 817 frm[0] = (v) & 0xff; \ 818 frm[1] = (v) >> 8; \ 819 frm += 2; \ 820 } while (0) 821 #define ADDSELECTOR(frm, sel) do { \ 822 memcpy(frm, sel, 4); \ 823 frm += 4; \ 824 } while (0) 825 static const uint8_t cipher_suite[][4] = { 826 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 827 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 828 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 829 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 830 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 831 { RSN_OUI_BYTES, RSN_CSE_NULL }, 832 }; 833 static const uint8_t wep104_suite[4] = 834 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 835 static const uint8_t key_mgt_unspec[4] = 836 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 837 static const uint8_t key_mgt_psk[4] = 838 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 839 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 840 uint8_t *frm = ie; 841 uint8_t *selcnt; 842 843 *frm++ = IEEE80211_ELEMID_RSN; 844 *frm++ = 0; /* length filled in below */ 845 ADDSHORT(frm, RSN_VERSION); 846 847 /* XXX filter out CKIP */ 848 849 /* multicast cipher */ 850 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 851 rsn->rsn_mcastkeylen >= 13) 852 ADDSELECTOR(frm, wep104_suite); 853 else 854 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 855 856 /* unicast cipher list */ 857 selcnt = frm; 858 ADDSHORT(frm, 0); /* selector count */ 859 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 860 selcnt[0]++; 861 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 862 } 863 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 864 selcnt[0]++; 865 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 866 } 867 868 /* authenticator selector list */ 869 selcnt = frm; 870 ADDSHORT(frm, 0); /* selector count */ 871 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 872 selcnt[0]++; 873 ADDSELECTOR(frm, key_mgt_unspec); 874 } 875 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 876 selcnt[0]++; 877 ADDSELECTOR(frm, key_mgt_psk); 878 } 879 880 /* optional capabilities */ 881 ADDSHORT(frm, rsn->rsn_caps); 882 /* XXX PMKID */ 883 884 /* calculate element length */ 885 ie[1] = frm - ie - 2; 886 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 887 ("RSN IE too big, %u > %zu", 888 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 889 return frm; 890 #undef ADDSELECTOR 891 #undef ADDSHORT 892 #undef RSN_OUI_BYTES 893 } 894 895 /* 896 * Add a WPA/RSN element to a frame. 897 */ 898 static uint8_t * 899 ieee80211_add_wpa(uint8_t *frm, struct ieee80211com *ic) 900 { 901 902 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 903 if (ic->ic_flags & IEEE80211_F_WPA2) 904 frm = ieee80211_setup_rsn_ie(ic, frm); 905 if (ic->ic_flags & IEEE80211_F_WPA1) 906 frm = ieee80211_setup_wpa_ie(ic, frm); 907 return frm; 908 } 909 910 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 911 /* 912 * Add a WME information element to a frame. 913 */ 914 static uint8_t * 915 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 916 { 917 static const struct ieee80211_wme_info info = { 918 .wme_id = IEEE80211_ELEMID_VENDOR, 919 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 920 .wme_oui = { WME_OUI_BYTES }, 921 .wme_type = WME_OUI_TYPE, 922 .wme_subtype = WME_INFO_OUI_SUBTYPE, 923 .wme_version = WME_VERSION, 924 .wme_info = 0, 925 }; 926 memcpy(frm, &info, sizeof(info)); 927 return frm + sizeof(info); 928 } 929 930 /* 931 * Add a WME parameters element to a frame. 932 */ 933 static uint8_t * 934 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 935 { 936 #define SM(_v, _f) (((_v) << _f##_S) & _f) 937 #define ADDSHORT(frm, v) do { \ 938 frm[0] = (v) & 0xff; \ 939 frm[1] = (v) >> 8; \ 940 frm += 2; \ 941 } while (0) 942 /* NB: this works 'cuz a param has an info at the front */ 943 static const struct ieee80211_wme_info param = { 944 .wme_id = IEEE80211_ELEMID_VENDOR, 945 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 946 .wme_oui = { WME_OUI_BYTES }, 947 .wme_type = WME_OUI_TYPE, 948 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 949 .wme_version = WME_VERSION, 950 }; 951 int i; 952 953 memcpy(frm, ¶m, sizeof(param)); 954 frm += __offsetof(struct ieee80211_wme_info, wme_info); 955 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 956 *frm++ = 0; /* reserved field */ 957 for (i = 0; i < WME_NUM_AC; i++) { 958 const struct wmeParams *ac = 959 &wme->wme_bssChanParams.cap_wmeParams[i]; 960 *frm++ = SM(i, WME_PARAM_ACI) 961 | SM(ac->wmep_acm, WME_PARAM_ACM) 962 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 963 ; 964 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 965 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 966 ; 967 ADDSHORT(frm, ac->wmep_txopLimit); 968 } 969 return frm; 970 #undef SM 971 #undef ADDSHORT 972 } 973 #undef WME_OUI_BYTES 974 975 /* 976 * Send a probe request frame with the specified ssid 977 * and any optional information element data. 978 */ 979 int 980 ieee80211_send_probereq(struct ieee80211_node *ni, 981 const uint8_t sa[IEEE80211_ADDR_LEN], 982 const uint8_t da[IEEE80211_ADDR_LEN], 983 const uint8_t bssid[IEEE80211_ADDR_LEN], 984 const uint8_t *ssid, size_t ssidlen, 985 const void *optie, size_t optielen) 986 { 987 struct ieee80211com *ic = ni->ni_ic; 988 struct ifnet *ifp = ic->ic_ifp; 989 enum ieee80211_phymode mode; 990 struct ieee80211_frame *wh; 991 struct mbuf *m; 992 uint8_t *frm; 993 994 /* 995 * Hold a reference on the node so it doesn't go away until after 996 * the xmit is complete all the way in the driver. On error we 997 * will remove our reference. 998 */ 999 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1000 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1001 __func__, __LINE__, 1002 ni, ni->ni_macaddr, ":", 1003 ieee80211_node_refcnt(ni) + 1); 1004 ieee80211_ref_node(ni); 1005 1006 /* 1007 * prreq frame format 1008 * [tlv] ssid 1009 * [tlv] supported rates 1010 * [tlv] extended supported rates 1011 * [tlv] user-specified ie's 1012 */ 1013 m = ieee80211_getmgtframe(&frm, 1014 2 + IEEE80211_NWID_LEN 1015 + 2 + IEEE80211_RATE_SIZE 1016 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1017 + (optie != NULL ? optielen : 0) 1018 ); 1019 if (m == NULL) { 1020 ic->ic_stats.is_tx_nobuf++; 1021 ieee80211_free_node(ni); 1022 return ENOMEM; 1023 } 1024 1025 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1026 mode = ieee80211_chan2mode(ic, ic->ic_curchan); 1027 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1028 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1029 1030 if (optie != NULL) { 1031 memcpy(frm, optie, optielen); 1032 frm += optielen; 1033 } 1034 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1035 1036 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1037 if (m == NULL) 1038 return ENOMEM; 1039 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1040 m->m_pkthdr.rcvif = (void *)ni; 1041 1042 wh = mtod(m, struct ieee80211_frame *); 1043 ieee80211_send_setup(ic, ni, wh, 1044 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1045 sa, da, bssid); 1046 /* XXX power management? */ 1047 1048 IEEE80211_NODE_STAT(ni, tx_probereq); 1049 IEEE80211_NODE_STAT(ni, tx_mgmt); 1050 1051 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1052 "[%6D] send probe req on channel %u\n", 1053 wh->i_addr1, ":", 1054 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1055 1056 IF_ENQUEUE(&ic->ic_mgtq, m); 1057 ifp->if_start(ifp); 1058 return 0; 1059 } 1060 1061 /* 1062 * Calculate capability information for mgt frames. 1063 */ 1064 static uint16_t 1065 getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan) 1066 { 1067 uint16_t capinfo; 1068 1069 KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode")); 1070 1071 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1072 capinfo = IEEE80211_CAPINFO_ESS; 1073 else if (ic->ic_opmode == IEEE80211_M_IBSS) 1074 capinfo = IEEE80211_CAPINFO_IBSS; 1075 else 1076 capinfo = 0; 1077 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1078 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1079 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1080 IEEE80211_IS_CHAN_2GHZ(chan)) 1081 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1082 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1083 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1084 return capinfo; 1085 } 1086 1087 /* 1088 * Send a management frame. The node is for the destination (or ic_bss 1089 * when in station mode). Nodes other than ic_bss have their reference 1090 * count bumped to reflect our use for an indeterminant time. 1091 */ 1092 int 1093 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1094 int type, int arg) 1095 { 1096 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1097 struct mbuf *m; 1098 uint8_t *frm; 1099 uint16_t capinfo; 1100 int has_challenge, is_shared_key, ret, timer, status; 1101 1102 KASSERT(ni != NULL, ("null node")); 1103 1104 /* 1105 * Hold a reference on the node so it doesn't go away until after 1106 * the xmit is complete all the way in the driver. On error we 1107 * will remove our reference. 1108 */ 1109 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1110 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1111 __func__, __LINE__, 1112 ni, ni->ni_macaddr, ":", 1113 ieee80211_node_refcnt(ni) + 1); 1114 ieee80211_ref_node(ni); 1115 1116 timer = 0; 1117 switch (type) { 1118 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1119 /* 1120 * probe response frame format 1121 * [8] time stamp 1122 * [2] beacon interval 1123 * [2] cabability information 1124 * [tlv] ssid 1125 * [tlv] supported rates 1126 * [tlv] parameter set (FH/DS) 1127 * [tlv] parameter set (IBSS) 1128 * [tlv] extended rate phy (ERP) 1129 * [tlv] extended supported rates 1130 * [tlv] WPA 1131 * [tlv] WME (optional) 1132 */ 1133 m = ieee80211_getmgtframe(&frm, 1134 8 1135 + sizeof(uint16_t) 1136 + sizeof(uint16_t) 1137 + 2 + IEEE80211_NWID_LEN 1138 + 2 + IEEE80211_RATE_SIZE 1139 + 7 /* max(7,3) */ 1140 + 6 1141 + 3 1142 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1143 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1144 + (ic->ic_flags & IEEE80211_F_WPA ? 1145 2*sizeof(struct ieee80211_ie_wpa) : 0) 1146 + sizeof(struct ieee80211_wme_param) 1147 ); 1148 if (m == NULL) 1149 senderr(ENOMEM, is_tx_nobuf); 1150 1151 memset(frm, 0, 8); /* timestamp should be filled later */ 1152 frm += 8; 1153 *(uint16_t *)frm = htole16(ic->ic_bss->ni_intval); 1154 frm += 2; 1155 capinfo = getcapinfo(ic, ic->ic_curchan); 1156 *(uint16_t *)frm = htole16(capinfo); 1157 frm += 2; 1158 1159 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1160 ic->ic_bss->ni_esslen); 1161 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1162 1163 if (ic->ic_phytype == IEEE80211_T_FH) { 1164 *frm++ = IEEE80211_ELEMID_FHPARMS; 1165 *frm++ = 5; 1166 *frm++ = ni->ni_fhdwell & 0x00ff; 1167 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1168 *frm++ = IEEE80211_FH_CHANSET( 1169 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1170 *frm++ = IEEE80211_FH_CHANPAT( 1171 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1172 *frm++ = ni->ni_fhindex; 1173 } else { 1174 *frm++ = IEEE80211_ELEMID_DSPARMS; 1175 *frm++ = 1; 1176 *frm++ = ieee80211_chan2ieee(ic, ic->ic_curchan); 1177 } 1178 1179 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1180 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1181 *frm++ = 2; 1182 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1183 } 1184 if (ic->ic_flags & IEEE80211_F_WPA) 1185 frm = ieee80211_add_wpa(frm, ic); 1186 if (ic->ic_curmode == IEEE80211_MODE_11G) 1187 frm = ieee80211_add_erp(frm, ic); 1188 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1189 if (ic->ic_flags & IEEE80211_F_WME) 1190 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1191 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1192 break; 1193 1194 case IEEE80211_FC0_SUBTYPE_AUTH: 1195 status = arg >> 16; 1196 arg &= 0xffff; 1197 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1198 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1199 ni->ni_challenge != NULL); 1200 1201 /* 1202 * Deduce whether we're doing open authentication or 1203 * shared key authentication. We do the latter if 1204 * we're in the middle of a shared key authentication 1205 * handshake or if we're initiating an authentication 1206 * request and configured to use shared key. 1207 */ 1208 is_shared_key = has_challenge || 1209 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1210 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1211 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1212 1213 m = ieee80211_getmgtframe(&frm, 1214 3 * sizeof(uint16_t) 1215 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1216 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1217 ); 1218 if (m == NULL) 1219 senderr(ENOMEM, is_tx_nobuf); 1220 1221 ((uint16_t *)frm)[0] = 1222 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1223 : htole16(IEEE80211_AUTH_ALG_OPEN); 1224 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1225 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1226 1227 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1228 ((uint16_t *)frm)[3] = 1229 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1230 IEEE80211_ELEMID_CHALLENGE); 1231 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1232 IEEE80211_CHALLENGE_LEN); 1233 m->m_pkthdr.len = m->m_len = 1234 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1235 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1236 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1237 "[%6D] request encrypt frame (%s)\n", 1238 ni->ni_macaddr, ":", __func__); 1239 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1240 } 1241 } else 1242 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1243 1244 /* XXX not right for shared key */ 1245 if (status == IEEE80211_STATUS_SUCCESS) 1246 IEEE80211_NODE_STAT(ni, tx_auth); 1247 else 1248 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1249 1250 if (ic->ic_opmode == IEEE80211_M_STA) 1251 timer = IEEE80211_TRANS_WAIT; 1252 break; 1253 1254 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1255 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1256 "[%6D] send station deauthenticate (reason %d)\n", 1257 ni->ni_macaddr, ":", arg); 1258 m = ieee80211_getmgtframe(&frm, sizeof(uint16_t)); 1259 if (m == NULL) 1260 senderr(ENOMEM, is_tx_nobuf); 1261 *(uint16_t *)frm = htole16(arg); /* reason */ 1262 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1263 1264 IEEE80211_NODE_STAT(ni, tx_deauth); 1265 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1266 1267 ieee80211_node_unauthorize(ni); /* port closed */ 1268 break; 1269 1270 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1271 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1272 /* 1273 * asreq frame format 1274 * [2] capability information 1275 * [2] listen interval 1276 * [6*] current AP address (reassoc only) 1277 * [tlv] ssid 1278 * [tlv] supported rates 1279 * [tlv] extended supported rates 1280 * [tlv] WME 1281 * [tlv] user-specified ie's 1282 */ 1283 m = ieee80211_getmgtframe(&frm, 1284 sizeof(uint16_t) 1285 + sizeof(uint16_t) 1286 + IEEE80211_ADDR_LEN 1287 + 2 + IEEE80211_NWID_LEN 1288 + 2 + IEEE80211_RATE_SIZE 1289 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1290 + sizeof(struct ieee80211_wme_info) 1291 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1292 ); 1293 if (m == NULL) 1294 senderr(ENOMEM, is_tx_nobuf); 1295 1296 KASSERT(ic->ic_opmode == IEEE80211_M_STA, 1297 ("wrong mode %u", ic->ic_opmode)); 1298 capinfo = IEEE80211_CAPINFO_ESS; 1299 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1300 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1301 /* 1302 * NB: Some 11a AP's reject the request when 1303 * short premable is set. 1304 */ 1305 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1306 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1307 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1308 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1309 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1310 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1311 *(uint16_t *)frm = htole16(capinfo); 1312 frm += 2; 1313 1314 *(uint16_t *)frm = htole16(ic->ic_lintval); 1315 frm += 2; 1316 1317 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1318 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1319 frm += IEEE80211_ADDR_LEN; 1320 } 1321 1322 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1323 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1324 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1325 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1326 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1327 if (ic->ic_opt_ie != NULL) { 1328 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1329 frm += ic->ic_opt_ie_len; 1330 } 1331 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1332 1333 timer = IEEE80211_TRANS_WAIT; 1334 break; 1335 1336 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1337 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1338 /* 1339 * asreq frame format 1340 * [2] capability information 1341 * [2] status 1342 * [2] association ID 1343 * [tlv] supported rates 1344 * [tlv] extended supported rates 1345 * [tlv] WME (if enabled and STA enabled) 1346 */ 1347 m = ieee80211_getmgtframe(&frm, 1348 sizeof(uint16_t) 1349 + sizeof(uint16_t) 1350 + sizeof(uint16_t) 1351 + 2 + IEEE80211_RATE_SIZE 1352 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1353 + sizeof(struct ieee80211_wme_param) 1354 ); 1355 if (m == NULL) 1356 senderr(ENOMEM, is_tx_nobuf); 1357 1358 capinfo = getcapinfo(ic, ic->ic_curchan); 1359 *(uint16_t *)frm = htole16(capinfo); 1360 frm += 2; 1361 1362 *(uint16_t *)frm = htole16(arg); /* status */ 1363 frm += 2; 1364 1365 if (arg == IEEE80211_STATUS_SUCCESS) { 1366 *(uint16_t *)frm = htole16(ni->ni_associd); 1367 IEEE80211_NODE_STAT(ni, tx_assoc); 1368 } else 1369 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1370 frm += 2; 1371 1372 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1373 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1374 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1375 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1376 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1377 break; 1378 1379 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1380 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1381 "[%6D] send station disassociate (reason %d)\n", 1382 ni->ni_macaddr, ":", arg); 1383 m = ieee80211_getmgtframe(&frm, sizeof(uint16_t)); 1384 if (m == NULL) 1385 senderr(ENOMEM, is_tx_nobuf); 1386 *(uint16_t *)frm = htole16(arg); /* reason */ 1387 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1388 1389 IEEE80211_NODE_STAT(ni, tx_disassoc); 1390 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1391 break; 1392 1393 default: 1394 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1395 "[%6D] invalid mgmt frame type %u\n", 1396 ni->ni_macaddr, ":", type); 1397 senderr(EINVAL, is_tx_unknownmgt); 1398 /* NOTREACHED */ 1399 } 1400 ret = ieee80211_mgmt_output(ic, ni, m, type, timer); 1401 if (ret != 0) { 1402 bad: 1403 ieee80211_free_node(ni); 1404 } 1405 return ret; 1406 #undef senderr 1407 } 1408 1409 /* 1410 * Allocate a beacon frame and fillin the appropriate bits. 1411 */ 1412 struct mbuf * 1413 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1414 struct ieee80211_beacon_offsets *bo) 1415 { 1416 struct ifnet *ifp = ic->ic_ifp; 1417 struct ieee80211_frame *wh; 1418 struct mbuf *m; 1419 int pktlen; 1420 uint8_t *frm, *efrm; 1421 uint16_t capinfo; 1422 struct ieee80211_rateset *rs; 1423 1424 /* 1425 * beacon frame format 1426 * [8] time stamp 1427 * [2] beacon interval 1428 * [2] cabability information 1429 * [tlv] ssid 1430 * [tlv] supported rates 1431 * [3] parameter set (DS) 1432 * [tlv] parameter set (IBSS/TIM) 1433 * [tlv] extended rate phy (ERP) 1434 * [tlv] extended supported rates 1435 * [tlv] WME parameters 1436 * [tlv] WPA/RSN parameters 1437 * XXX Vendor-specific OIDs (e.g. Atheros) 1438 * NB: we allocate the max space required for the TIM bitmap. 1439 */ 1440 rs = &ni->ni_rates; 1441 pktlen = 8 /* time stamp */ 1442 + sizeof(uint16_t) /* beacon interval */ 1443 + sizeof(uint16_t) /* capabilities */ 1444 + 2 + ni->ni_esslen /* ssid */ 1445 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1446 + 2 + 1 /* DS parameters */ 1447 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1448 + 2 + 1 /* ERP */ 1449 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1450 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1451 sizeof(struct ieee80211_wme_param) : 0) 1452 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1453 2*sizeof(struct ieee80211_ie_wpa) : 0) 1454 ; 1455 m = ieee80211_getmgtframe(&frm, pktlen); 1456 if (m == NULL) { 1457 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1458 "%s: cannot get buf; size %u\n", __func__, pktlen); 1459 ic->ic_stats.is_tx_nobuf++; 1460 return NULL; 1461 } 1462 1463 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1464 frm += 8; 1465 *(uint16_t *)frm = htole16(ni->ni_intval); 1466 frm += 2; 1467 capinfo = getcapinfo(ic, ni->ni_chan); 1468 bo->bo_caps = (uint16_t *)frm; 1469 *(uint16_t *)frm = htole16(capinfo); 1470 frm += 2; 1471 *frm++ = IEEE80211_ELEMID_SSID; 1472 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1473 *frm++ = ni->ni_esslen; 1474 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1475 frm += ni->ni_esslen; 1476 } else 1477 *frm++ = 0; 1478 frm = ieee80211_add_rates(frm, rs); 1479 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1480 *frm++ = IEEE80211_ELEMID_DSPARMS; 1481 *frm++ = 1; 1482 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1483 } 1484 bo->bo_tim = frm; 1485 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1486 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1487 *frm++ = 2; 1488 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1489 bo->bo_tim_len = 0; 1490 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1491 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1492 1493 tie->tim_ie = IEEE80211_ELEMID_TIM; 1494 tie->tim_len = 4; /* length */ 1495 tie->tim_count = 0; /* DTIM count */ 1496 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1497 tie->tim_bitctl = 0; /* bitmap control */ 1498 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1499 frm += sizeof(struct ieee80211_tim_ie); 1500 bo->bo_tim_len = 1; 1501 } 1502 bo->bo_trailer = frm; 1503 if (ic->ic_flags & IEEE80211_F_WME) { 1504 bo->bo_wme = frm; 1505 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1506 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1507 } 1508 if (ic->ic_flags & IEEE80211_F_WPA) 1509 frm = ieee80211_add_wpa(frm, ic); 1510 if (ic->ic_curmode == IEEE80211_MODE_11G) { 1511 bo->bo_erp = frm; 1512 frm = ieee80211_add_erp(frm, ic); 1513 } 1514 efrm = ieee80211_add_xrates(frm, rs); 1515 bo->bo_trailer_len = efrm - bo->bo_trailer; 1516 m->m_pkthdr.len = m->m_len = efrm - mtod(m, uint8_t *); 1517 1518 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1519 KASSERT(m != NULL, ("no space for 802.11 header?")); 1520 wh = mtod(m, struct ieee80211_frame *); 1521 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1522 IEEE80211_FC0_SUBTYPE_BEACON; 1523 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1524 *(uint16_t *)wh->i_dur = 0; 1525 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1526 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1527 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1528 *(uint16_t *)wh->i_seq = 0; 1529 1530 return m; 1531 } 1532 1533 /* 1534 * Update the dynamic parts of a beacon frame based on the current state. 1535 */ 1536 int 1537 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1538 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1539 { 1540 int len_changed = 0; 1541 uint16_t capinfo; 1542 1543 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer); 1544 1545 /* XXX faster to recalculate entirely or just changes? */ 1546 capinfo = getcapinfo(ic, ni->ni_chan); 1547 *bo->bo_caps = htole16(capinfo); 1548 1549 if (ic->ic_flags & IEEE80211_F_WME) { 1550 struct ieee80211_wme_state *wme = &ic->ic_wme; 1551 1552 /* 1553 * Check for agressive mode change. When there is 1554 * significant high priority traffic in the BSS 1555 * throttle back BE traffic by using conservative 1556 * parameters. Otherwise BE uses agressive params 1557 * to optimize performance of legacy/non-QoS traffic. 1558 */ 1559 if (wme->wme_flags & WME_F_AGGRMODE) { 1560 if (wme->wme_hipri_traffic > 1561 wme->wme_hipri_switch_thresh) { 1562 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1563 "%s: traffic %u, disable aggressive mode\n", 1564 __func__, wme->wme_hipri_traffic); 1565 wme->wme_flags &= ~WME_F_AGGRMODE; 1566 ieee80211_wme_updateparams(ic); 1567 wme->wme_hipri_traffic = 1568 wme->wme_hipri_switch_hysteresis; 1569 } else 1570 wme->wme_hipri_traffic = 0; 1571 } else { 1572 if (wme->wme_hipri_traffic <= 1573 wme->wme_hipri_switch_thresh) { 1574 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1575 "%s: traffic %u, enable aggressive mode\n", 1576 __func__, wme->wme_hipri_traffic); 1577 wme->wme_flags |= WME_F_AGGRMODE; 1578 ieee80211_wme_updateparams(ic); 1579 wme->wme_hipri_traffic = 0; 1580 } else 1581 wme->wme_hipri_traffic = 1582 wme->wme_hipri_switch_hysteresis; 1583 } 1584 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1585 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1586 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1587 } 1588 } 1589 1590 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1591 struct ieee80211_tim_ie *tie = 1592 (struct ieee80211_tim_ie *) bo->bo_tim; 1593 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1594 u_int timlen, timoff, i; 1595 /* 1596 * ATIM/DTIM needs updating. If it fits in the 1597 * current space allocated then just copy in the 1598 * new bits. Otherwise we need to move any trailing 1599 * data to make room. Note that we know there is 1600 * contiguous space because ieee80211_beacon_allocate 1601 * insures there is space in the mbuf to write a 1602 * maximal-size virtual bitmap (based on ic_max_aid). 1603 */ 1604 /* 1605 * Calculate the bitmap size and offset, copy any 1606 * trailer out of the way, and then copy in the 1607 * new bitmap and update the information element. 1608 * Note that the tim bitmap must contain at least 1609 * one byte and any offset must be even. 1610 */ 1611 if (ic->ic_ps_pending != 0) { 1612 timoff = 128; /* impossibly large */ 1613 for (i = 0; i < ic->ic_tim_len; i++) 1614 if (ic->ic_tim_bitmap[i]) { 1615 timoff = i &~ 1; 1616 break; 1617 } 1618 KASSERT(timoff != 128, ("tim bitmap empty!")); 1619 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1620 if (ic->ic_tim_bitmap[i]) 1621 break; 1622 timlen = 1 + (i - timoff); 1623 } else { 1624 timoff = 0; 1625 timlen = 1; 1626 } 1627 if (timlen != bo->bo_tim_len) { 1628 /* copy up/down trailer */ 1629 int adjust = tie->tim_bitmap+timlen 1630 - bo->bo_trailer; 1631 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust, 1632 bo->bo_trailer_len); 1633 bo->bo_trailer += adjust; 1634 bo->bo_wme += adjust; 1635 bo->bo_erp += adjust; 1636 bo->bo_tim_len = timlen; 1637 1638 /* update information element */ 1639 tie->tim_len = 3 + timlen; 1640 tie->tim_bitctl = timoff; 1641 len_changed = 1; 1642 } 1643 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1644 bo->bo_tim_len); 1645 1646 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1647 1648 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1649 "%s: TIM updated, pending %u, off %u, len %u\n", 1650 __func__, ic->ic_ps_pending, timoff, timlen); 1651 } 1652 /* count down DTIM period */ 1653 if (tie->tim_count == 0) 1654 tie->tim_count = tie->tim_period - 1; 1655 else 1656 tie->tim_count--; 1657 /* update state for buffered multicast frames on DTIM */ 1658 if (mcast && tie->tim_count == 0) 1659 tie->tim_bitctl |= 1; 1660 else 1661 tie->tim_bitctl &= ~1; 1662 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) { 1663 /* 1664 * ERP element needs updating. 1665 */ 1666 (void) ieee80211_add_erp(bo->bo_erp, ic); 1667 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE; 1668 } 1669 } 1670 1671 return len_changed; 1672 } 1673 1674 /* 1675 * Save an outbound packet for a node in power-save sleep state. 1676 * The new packet is placed on the node's saved queue, and the TIM 1677 * is changed, if necessary. 1678 */ 1679 void 1680 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1681 struct mbuf *m) 1682 { 1683 int qlen, age; 1684 1685 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer); 1686 1687 if (IF_QFULL(&ni->ni_savedq)) { 1688 IF_DROP(&ni->ni_savedq); 1689 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1690 "[%6D] pwr save q overflow, drops %d (size %d)\n", 1691 ni->ni_macaddr, ":", 1692 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1693 #ifdef IEEE80211_DEBUG 1694 if (ieee80211_msg_dumppkts(ic)) 1695 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1696 #endif 1697 m_freem(m); 1698 return; 1699 } 1700 /* 1701 * Tag the frame with it's expiry time and insert 1702 * it in the queue. The aging interval is 4 times 1703 * the listen interval specified by the station. 1704 * Frames that sit around too long are reclaimed 1705 * using this information. 1706 */ 1707 /* XXX handle overflow? */ 1708 age = ((ni->ni_intval * ic->ic_bintval) << 2) / 1024; /* TU -> secs */ 1709 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1710 1711 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1712 "[%6D] save frame with age %d, %u now queued\n", 1713 ni->ni_macaddr, ":", age, qlen); 1714 1715 if (qlen == 1) 1716 ic->ic_set_tim(ni, 1); 1717 } 1718