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 1.26.2.8 2006/09/02 15:06:04 sam Exp $ 33 * $DragonFly: src/sys/netproto/802_11/wlan/ieee80211_output.c,v 1.24 2007/09/15 07:19:23 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, int encrypt) 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 (encrypt) { 176 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 177 "[%6D] encrypting frame (%s)\n", 178 wh->i_addr1, ":", __func__); 179 wh->i_fc[1] |= IEEE80211_FC1_WEP; 180 } 181 #ifdef IEEE80211_DEBUG 182 /* avoid printing too many frames */ 183 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 184 ieee80211_msg_dumppkts(ic)) { 185 kprintf("[%6D] send %s on channel %u\n", 186 wh->i_addr1, ":", 187 ieee80211_mgt_subtype_name[ 188 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 189 IEEE80211_FC0_SUBTYPE_SHIFT], 190 ieee80211_chan2ieee(ic, ic->ic_curchan)); 191 } 192 #endif 193 IEEE80211_NODE_STAT(ni, tx_mgmt); 194 IF_ENQUEUE(&ic->ic_mgtq, m); 195 if (timer) { 196 /* 197 * Set the mgt frame timeout. 198 */ 199 ic->ic_mgt_timer = timer; 200 ifp->if_timer = 1; 201 } 202 ifp->if_start(ifp); 203 return 0; 204 } 205 206 /* 207 * Send a null data frame to the specified node. 208 * 209 * NB: the caller is assumed to have setup a node reference 210 * for use; this is necessary to deal with a race condition 211 * when probing for inactive stations. 212 */ 213 int 214 ieee80211_send_nulldata(struct ieee80211_node *ni) 215 { 216 struct ieee80211com *ic = ni->ni_ic; 217 struct ifnet *ifp = ic->ic_ifp; 218 struct mbuf *m; 219 struct ieee80211_frame *wh; 220 221 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 222 if (m == NULL) { 223 /* XXX debug msg */ 224 ic->ic_stats.is_tx_nobuf++; 225 ieee80211_unref_node(&ni); 226 return ENOMEM; 227 } 228 m->m_pkthdr.rcvif = (void *) ni; 229 230 wh = mtod(m, struct ieee80211_frame *); 231 ieee80211_send_setup(ic, ni, wh, 232 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 233 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 234 /* NB: power management bit is never sent by an AP */ 235 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 236 ic->ic_opmode != IEEE80211_M_HOSTAP) 237 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 238 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 239 240 IEEE80211_NODE_STAT(ni, tx_data); 241 242 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 243 "[%s] send null data frame on channel %u, pwr mgt %s\n", 244 ni->ni_macaddr, ":", 245 ieee80211_chan2ieee(ic, ic->ic_curchan), 246 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 247 248 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 249 ifp->if_start(ifp); 250 return 0; 251 } 252 253 /* 254 * Assign priority to a frame based on any vlan tag assigned 255 * to the station and/or any Diffserv setting in an IP header. 256 * Finally, if an ACM policy is setup (in station mode) it's 257 * applied. 258 */ 259 int 260 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 261 { 262 int v_wme_ac = 0, d_wme_ac, ac; 263 #ifdef INET 264 struct ether_header *eh; 265 #endif 266 267 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 268 ac = WME_AC_BE; 269 goto done; 270 } 271 272 #ifdef FREEBSD_VLAN 273 /* 274 * If node has a vlan tag then all traffic 275 * to it must have a matching tag. 276 */ 277 v_wme_ac = 0; 278 if (ni->ni_vlan != 0) { 279 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m); 280 if (mtag == NULL) { 281 IEEE80211_NODE_STAT(ni, tx_novlantag); 282 return 1; 283 } 284 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 285 EVL_VLANOFTAG(ni->ni_vlan)) { 286 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 287 return 1; 288 } 289 /* map vlan priority to AC */ 290 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 291 case 1: 292 case 2: 293 v_wme_ac = WME_AC_BK; 294 break; 295 case 0: 296 case 3: 297 v_wme_ac = WME_AC_BE; 298 break; 299 case 4: 300 case 5: 301 v_wme_ac = WME_AC_VI; 302 break; 303 case 6: 304 case 7: 305 v_wme_ac = WME_AC_VO; 306 break; 307 } 308 } 309 #endif /* FREEBSD_VLAN */ 310 311 #ifdef INET 312 eh = mtod(m, struct ether_header *); 313 if (eh->ether_type == htons(ETHERTYPE_IP)) { 314 const struct ip *ip = (struct ip *) 315 (mtod(m, uint8_t *) + sizeof (*eh)); 316 /* 317 * IP frame, map the TOS field. 318 */ 319 switch (ip->ip_tos) { 320 case 0x08: 321 case 0x20: 322 d_wme_ac = WME_AC_BK; /* background */ 323 break; 324 case 0x28: 325 case 0xa0: 326 d_wme_ac = WME_AC_VI; /* video */ 327 break; 328 case 0x30: /* voice */ 329 case 0xe0: 330 case 0x88: /* XXX UPSD */ 331 case 0xb8: 332 d_wme_ac = WME_AC_VO; 333 break; 334 default: 335 d_wme_ac = WME_AC_BE; 336 break; 337 } 338 } else { 339 #endif /* INET */ 340 d_wme_ac = WME_AC_BE; 341 #ifdef INET 342 } 343 #endif 344 /* 345 * Use highest priority AC. 346 */ 347 if (v_wme_ac > d_wme_ac) 348 ac = v_wme_ac; 349 else 350 ac = d_wme_ac; 351 352 /* 353 * Apply ACM policy. 354 */ 355 if (ic->ic_opmode == IEEE80211_M_STA) { 356 static const int acmap[4] = { 357 WME_AC_BK, /* WME_AC_BE */ 358 WME_AC_BK, /* WME_AC_BK */ 359 WME_AC_BE, /* WME_AC_VI */ 360 WME_AC_VI, /* WME_AC_VO */ 361 }; 362 while (ac != WME_AC_BK && 363 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 364 ac = acmap[ac]; 365 } 366 done: 367 M_WME_SETAC(m, ac); 368 return 0; 369 } 370 371 /* 372 * Insure there is sufficient contiguous space to encapsulate the 373 * 802.11 data frame. If room isn't already there, arrange for it. 374 * Drivers and cipher modules assume we have done the necessary work 375 * and fail rudely if they don't find the space they need. 376 */ 377 static struct mbuf * 378 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 379 struct ieee80211_key *key, struct mbuf *m) 380 { 381 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 382 int needed_space = hdrsize + ic->ic_headroom; 383 384 if (key != NULL) { 385 /* XXX belongs in crypto code? */ 386 if ((key->wk_flags & IEEE80211_KEY_NOHDR) == 0) 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(MB_DONTWAIT, 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 goto bad; 532 } 533 } else 534 key = NULL; 535 /* XXX 4-address format */ 536 /* 537 * XXX Some ap's don't handle QoS-encapsulated EAPOL 538 * frames so suppress use. This may be an issue if other 539 * ap's require all data frames to be QoS-encapsulated 540 * once negotiated in which case we'll need to make this 541 * configurable. 542 */ 543 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 544 eh.ether_type != htons(ETHERTYPE_PAE); 545 if (addqos) 546 hdrsize = sizeof(struct ieee80211_qosframe); 547 else 548 hdrsize = sizeof(struct ieee80211_frame); 549 if (ic->ic_flags & IEEE80211_F_DATAPAD) 550 hdrsize = roundup(hdrsize, sizeof(uint32_t)); 551 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 552 if (m == NULL) { 553 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 554 goto bad; 555 } 556 557 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 558 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 559 llc = mtod(m, struct llc *); 560 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 561 llc->llc_control = LLC_UI; 562 llc->llc_snap.org_code[0] = 0; 563 llc->llc_snap.org_code[1] = 0; 564 llc->llc_snap.org_code[2] = 0; 565 llc->llc_snap.ether_type = eh.ether_type; 566 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 567 568 M_PREPEND(m, hdrsize, MB_DONTWAIT); 569 if (m == NULL) { 570 ic->ic_stats.is_tx_nobuf++; 571 goto bad; 572 } 573 wh = mtod(m, struct ieee80211_frame *); 574 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 575 *(uint16_t *)wh->i_dur = 0; 576 switch (ic->ic_opmode) { 577 case IEEE80211_M_STA: 578 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 579 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 580 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 581 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 582 break; 583 case IEEE80211_M_IBSS: 584 case IEEE80211_M_AHDEMO: 585 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 586 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 587 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 588 /* 589 * NB: always use the bssid from ic_bss as the 590 * neighbor's may be stale after an ibss merge 591 */ 592 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 593 break; 594 case IEEE80211_M_HOSTAP: 595 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 596 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 597 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 598 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 599 break; 600 case IEEE80211_M_MONITOR: 601 goto bad; 602 } 603 if (m->m_flags & M_MORE_DATA) 604 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 605 if (addqos) { 606 struct ieee80211_qosframe *qwh = 607 (struct ieee80211_qosframe *) wh; 608 int ac, tid; 609 610 ac = M_WME_GETAC(m); 611 /* map from access class/queue to 11e header priorty value */ 612 tid = WME_AC_TO_TID(ac); 613 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 614 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 615 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 616 qwh->i_qos[1] = 0; 617 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 618 619 *(uint16_t *)wh->i_seq = 620 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 621 ni->ni_txseqs[tid]++; 622 } else { 623 *(uint16_t *)wh->i_seq = 624 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 625 ni->ni_txseqs[0]++; 626 } 627 if (key != NULL) { 628 /* 629 * IEEE 802.1X: send EAPOL frames always in the clear. 630 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 631 */ 632 if (eh.ether_type != htons(ETHERTYPE_PAE) || 633 ((ic->ic_flags & IEEE80211_F_WPA) && 634 (ic->ic_opmode == IEEE80211_M_STA ? 635 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) { 636 wh->i_fc[1] |= IEEE80211_FC1_WEP; 637 /* XXX do fragmentation */ 638 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 639 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 640 "[%6D] enmic failed, discard frame\n", 641 eh.ether_dhost, ":"); 642 ic->ic_stats.is_crypto_enmicfail++; 643 goto bad; 644 } 645 } 646 } 647 648 IEEE80211_NODE_STAT(ni, tx_data); 649 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 650 IEEE80211_NODE_STAT(ni, tx_mcast); 651 else 652 IEEE80211_NODE_STAT(ni, tx_ucast); 653 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 654 655 return m; 656 bad: 657 if (m != NULL) 658 m_freem(m); 659 return NULL; 660 } 661 662 /* 663 * Add a supported rates element id to a frame. 664 */ 665 uint8_t * 666 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 667 { 668 int nrates; 669 670 *frm++ = IEEE80211_ELEMID_RATES; 671 nrates = rs->rs_nrates; 672 if (nrates > IEEE80211_RATE_SIZE) 673 nrates = IEEE80211_RATE_SIZE; 674 *frm++ = nrates; 675 memcpy(frm, rs->rs_rates, nrates); 676 return frm + nrates; 677 } 678 679 /* 680 * Add an extended supported rates element id to a frame. 681 */ 682 uint8_t * 683 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 684 { 685 /* 686 * Add an extended supported rates element if operating in 11g mode. 687 */ 688 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 689 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 690 *frm++ = IEEE80211_ELEMID_XRATES; 691 *frm++ = nrates; 692 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 693 frm += nrates; 694 } 695 return frm; 696 } 697 698 /* 699 * Add an ssid elemet to a frame. 700 */ 701 uint8_t * 702 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 703 { 704 *frm++ = IEEE80211_ELEMID_SSID; 705 *frm++ = len; 706 memcpy(frm, ssid, len); 707 return frm + len; 708 } 709 710 /* 711 * Add an erp element to a frame. 712 */ 713 static uint8_t * 714 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 715 { 716 uint8_t erp; 717 718 *frm++ = IEEE80211_ELEMID_ERP; 719 *frm++ = 1; 720 erp = 0; 721 if (ic->ic_nonerpsta != 0) 722 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 723 if (ic->ic_flags & IEEE80211_F_USEPROT) 724 erp |= IEEE80211_ERP_USE_PROTECTION; 725 if (ic->ic_flags & IEEE80211_F_USEBARKER) 726 erp |= IEEE80211_ERP_LONG_PREAMBLE; 727 *frm++ = erp; 728 return frm; 729 } 730 731 static uint8_t * 732 ieee80211_setup_wpa_ie(struct ieee80211com *ic, uint8_t *ie) 733 { 734 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 735 #define ADDSHORT(frm, v) do { \ 736 frm[0] = (v) & 0xff; \ 737 frm[1] = (v) >> 8; \ 738 frm += 2; \ 739 } while (0) 740 #define ADDSELECTOR(frm, sel) do { \ 741 memcpy(frm, sel, 4); \ 742 frm += 4; \ 743 } while (0) 744 static const uint8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 745 static const uint8_t cipher_suite[][4] = { 746 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 747 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 748 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 749 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 750 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 751 { WPA_OUI_BYTES, WPA_CSE_NULL }, 752 }; 753 static const uint8_t wep104_suite[4] = 754 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 755 static const uint8_t key_mgt_unspec[4] = 756 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 757 static const uint8_t key_mgt_psk[4] = 758 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 759 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 760 uint8_t *frm = ie; 761 uint8_t *selcnt; 762 763 *frm++ = IEEE80211_ELEMID_VENDOR; 764 *frm++ = 0; /* length filled in below */ 765 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 766 frm += sizeof(oui); 767 ADDSHORT(frm, WPA_VERSION); 768 769 /* XXX filter out CKIP */ 770 771 /* multicast cipher */ 772 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 773 rsn->rsn_mcastkeylen >= 13) 774 ADDSELECTOR(frm, wep104_suite); 775 else 776 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 777 778 /* unicast cipher list */ 779 selcnt = frm; 780 ADDSHORT(frm, 0); /* selector count */ 781 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 782 selcnt[0]++; 783 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 784 } 785 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 786 selcnt[0]++; 787 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 788 } 789 790 /* authenticator selector list */ 791 selcnt = frm; 792 ADDSHORT(frm, 0); /* selector count */ 793 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 794 selcnt[0]++; 795 ADDSELECTOR(frm, key_mgt_unspec); 796 } 797 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 798 selcnt[0]++; 799 ADDSELECTOR(frm, key_mgt_psk); 800 } 801 802 /* optional capabilities */ 803 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 804 ADDSHORT(frm, rsn->rsn_caps); 805 806 /* calculate element length */ 807 ie[1] = frm - ie - 2; 808 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 809 ("WPA IE too big, %u > %zu", 810 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 811 return frm; 812 #undef ADDSHORT 813 #undef ADDSELECTOR 814 #undef WPA_OUI_BYTES 815 } 816 817 static uint8_t * 818 ieee80211_setup_rsn_ie(struct ieee80211com *ic, uint8_t *ie) 819 { 820 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 821 #define ADDSHORT(frm, v) do { \ 822 frm[0] = (v) & 0xff; \ 823 frm[1] = (v) >> 8; \ 824 frm += 2; \ 825 } while (0) 826 #define ADDSELECTOR(frm, sel) do { \ 827 memcpy(frm, sel, 4); \ 828 frm += 4; \ 829 } while (0) 830 static const uint8_t cipher_suite[][4] = { 831 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 832 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 833 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 834 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 835 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 836 { RSN_OUI_BYTES, RSN_CSE_NULL }, 837 }; 838 static const uint8_t wep104_suite[4] = 839 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 840 static const uint8_t key_mgt_unspec[4] = 841 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 842 static const uint8_t key_mgt_psk[4] = 843 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 844 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 845 uint8_t *frm = ie; 846 uint8_t *selcnt; 847 848 *frm++ = IEEE80211_ELEMID_RSN; 849 *frm++ = 0; /* length filled in below */ 850 ADDSHORT(frm, RSN_VERSION); 851 852 /* XXX filter out CKIP */ 853 854 /* multicast cipher */ 855 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 856 rsn->rsn_mcastkeylen >= 13) 857 ADDSELECTOR(frm, wep104_suite); 858 else 859 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 860 861 /* unicast cipher list */ 862 selcnt = frm; 863 ADDSHORT(frm, 0); /* selector count */ 864 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 865 selcnt[0]++; 866 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 867 } 868 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 869 selcnt[0]++; 870 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 871 } 872 873 /* authenticator selector list */ 874 selcnt = frm; 875 ADDSHORT(frm, 0); /* selector count */ 876 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 877 selcnt[0]++; 878 ADDSELECTOR(frm, key_mgt_unspec); 879 } 880 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 881 selcnt[0]++; 882 ADDSELECTOR(frm, key_mgt_psk); 883 } 884 885 /* optional capabilities */ 886 ADDSHORT(frm, rsn->rsn_caps); 887 /* XXX PMKID */ 888 889 /* calculate element length */ 890 ie[1] = frm - ie - 2; 891 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 892 ("RSN IE too big, %u > %zu", 893 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 894 return frm; 895 #undef ADDSELECTOR 896 #undef ADDSHORT 897 #undef RSN_OUI_BYTES 898 } 899 900 /* 901 * Add a WPA/RSN element to a frame. 902 */ 903 static uint8_t * 904 ieee80211_add_wpa(uint8_t *frm, struct ieee80211com *ic) 905 { 906 907 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 908 if (ic->ic_flags & IEEE80211_F_WPA2) 909 frm = ieee80211_setup_rsn_ie(ic, frm); 910 if (ic->ic_flags & IEEE80211_F_WPA1) 911 frm = ieee80211_setup_wpa_ie(ic, frm); 912 return frm; 913 } 914 915 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 916 /* 917 * Add a WME information element to a frame. 918 */ 919 static uint8_t * 920 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 921 { 922 static const struct ieee80211_wme_info info = { 923 .wme_id = IEEE80211_ELEMID_VENDOR, 924 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 925 .wme_oui = { WME_OUI_BYTES }, 926 .wme_type = WME_OUI_TYPE, 927 .wme_subtype = WME_INFO_OUI_SUBTYPE, 928 .wme_version = WME_VERSION, 929 .wme_info = 0, 930 }; 931 memcpy(frm, &info, sizeof(info)); 932 return frm + sizeof(info); 933 } 934 935 /* 936 * Add a WME parameters element to a frame. 937 */ 938 static uint8_t * 939 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 940 { 941 #define SM(_v, _f) (((_v) << _f##_S) & _f) 942 #define ADDSHORT(frm, v) do { \ 943 frm[0] = (v) & 0xff; \ 944 frm[1] = (v) >> 8; \ 945 frm += 2; \ 946 } while (0) 947 /* NB: this works 'cuz a param has an info at the front */ 948 static const struct ieee80211_wme_info param = { 949 .wme_id = IEEE80211_ELEMID_VENDOR, 950 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 951 .wme_oui = { WME_OUI_BYTES }, 952 .wme_type = WME_OUI_TYPE, 953 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 954 .wme_version = WME_VERSION, 955 }; 956 int i; 957 958 memcpy(frm, ¶m, sizeof(param)); 959 frm += __offsetof(struct ieee80211_wme_info, wme_info); 960 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 961 *frm++ = 0; /* reserved field */ 962 for (i = 0; i < WME_NUM_AC; i++) { 963 const struct wmeParams *ac = 964 &wme->wme_bssChanParams.cap_wmeParams[i]; 965 *frm++ = SM(i, WME_PARAM_ACI) 966 | SM(ac->wmep_acm, WME_PARAM_ACM) 967 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 968 ; 969 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 970 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 971 ; 972 ADDSHORT(frm, ac->wmep_txopLimit); 973 } 974 return frm; 975 #undef SM 976 #undef ADDSHORT 977 } 978 #undef WME_OUI_BYTES 979 980 /* 981 * Send a probe request frame with the specified ssid 982 * and any optional information element data. 983 */ 984 int 985 ieee80211_send_probereq(struct ieee80211_node *ni, 986 const uint8_t sa[IEEE80211_ADDR_LEN], 987 const uint8_t da[IEEE80211_ADDR_LEN], 988 const uint8_t bssid[IEEE80211_ADDR_LEN], 989 const uint8_t *ssid, size_t ssidlen, 990 const void *optie, size_t optielen) 991 { 992 struct ieee80211com *ic = ni->ni_ic; 993 struct ifnet *ifp = ic->ic_ifp; 994 enum ieee80211_phymode mode; 995 struct ieee80211_frame *wh; 996 struct ieee80211_rateset rs; 997 struct mbuf *m; 998 uint8_t *frm; 999 1000 /* 1001 * Hold a reference on the node so it doesn't go away until after 1002 * the xmit is complete all the way in the driver. On error we 1003 * will remove our reference. 1004 */ 1005 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1006 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1007 __func__, __LINE__, 1008 ni, ni->ni_macaddr, ":", 1009 ieee80211_node_refcnt(ni) + 1); 1010 ieee80211_ref_node(ni); 1011 1012 /* 1013 * prreq frame format 1014 * [tlv] ssid 1015 * [tlv] supported rates 1016 * [tlv] extended supported rates 1017 * [tlv] user-specified ie's 1018 */ 1019 m = ieee80211_getmgtframe(&frm, 1020 ic->ic_headroom + sizeof(struct ieee80211_frame), 1021 2 + IEEE80211_NWID_LEN 1022 + 2 + IEEE80211_RATE_SIZE 1023 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1024 + (optie != NULL ? optielen : 0) 1025 ); 1026 if (m == NULL) { 1027 ic->ic_stats.is_tx_nobuf++; 1028 ieee80211_free_node(ni); 1029 return ENOMEM; 1030 } 1031 1032 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1033 1034 /* 1035 * XXX 1036 * Clear basic rates. 1037 * 1038 * Though according to 802.11 standard: MSB of each supported rate 1039 * octet in (Extended) Supported Rates ie of probe requests should 1040 * be ignored, some HostAP implementations still check it ... 1041 */ 1042 mode = ieee80211_chan2mode(ic, ic->ic_curchan); 1043 rs = ic->ic_sup_rates[mode]; 1044 ieee80211_set_basicrates(&rs, IEEE80211_MODE_AUTO, 0); 1045 frm = ieee80211_add_rates(frm, &rs); 1046 frm = ieee80211_add_xrates(frm, &rs); 1047 1048 if (optie != NULL) { 1049 memcpy(frm, optie, optielen); 1050 frm += optielen; 1051 } 1052 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1053 1054 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1055 if (m == NULL) 1056 return ENOMEM; 1057 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1058 m->m_pkthdr.rcvif = (void *)ni; 1059 1060 wh = mtod(m, struct ieee80211_frame *); 1061 ieee80211_send_setup(ic, ni, wh, 1062 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1063 sa, da, bssid); 1064 /* XXX power management? */ 1065 1066 IEEE80211_NODE_STAT(ni, tx_probereq); 1067 IEEE80211_NODE_STAT(ni, tx_mgmt); 1068 1069 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1070 "[%6D] send probe req on channel %u\n", 1071 wh->i_addr1, ":", 1072 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1073 1074 IF_ENQUEUE(&ic->ic_mgtq, m); 1075 ifp->if_start(ifp); 1076 return 0; 1077 } 1078 1079 /* 1080 * Calculate capability information for mgt frames. 1081 */ 1082 static uint16_t 1083 getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan) 1084 { 1085 uint16_t capinfo; 1086 1087 KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode")); 1088 1089 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1090 capinfo = IEEE80211_CAPINFO_ESS; 1091 else if (ic->ic_opmode == IEEE80211_M_IBSS) 1092 capinfo = IEEE80211_CAPINFO_IBSS; 1093 else 1094 capinfo = 0; 1095 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1096 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1097 if (IEEE80211_IS_CHAN_2GHZ(chan)) { 1098 if (ic->ic_flags & IEEE80211_F_SHPREAMBLE) 1099 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1100 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC) 1101 capinfo |= IEEE80211_CAPINFO_PBCC; 1102 } 1103 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1104 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1105 return capinfo; 1106 } 1107 1108 static struct mbuf * 1109 _ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni) 1110 { 1111 const struct ieee80211_rateset *rs; 1112 uint16_t capinfo; 1113 struct mbuf *m; 1114 uint8_t *frm; 1115 int pktlen; 1116 1117 /* 1118 * probe response frame format 1119 * [8] time stamp 1120 * [2] beacon interval 1121 * [2] cabability information 1122 * [tlv] ssid 1123 * [tlv] supported rates 1124 * [tlv] parameter set (FH/DS) 1125 * [4] parameter set (IBSS) 1126 * [tlv] extended rate phy (ERP) 1127 * [tlv] extended supported rates 1128 * [tlv] WPA 1129 * [tlv] WME (optional) 1130 */ 1131 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO); 1132 rs = &ic->ic_sup_rates[ic->ic_curmode]; 1133 pktlen = 8 /* time stamp */ 1134 + sizeof(uint16_t) /* beacon interval */ 1135 + sizeof(uint16_t) /* capabilities */ 1136 + 2 + ni->ni_esslen /* ssid */ 1137 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1138 + 2 + 5 /* max(5,1) */ /* DS/FH parameters */ 1139 + 2 + 2 /* IBSS parameters */ 1140 + 2 + 1 /* ERP */ 1141 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1142 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1143 + (ic->ic_flags & IEEE80211_F_WPA ? /* WPA 1+2 */ 1144 2*sizeof(struct ieee80211_ie_wpa) : 0) 1145 + sizeof(struct ieee80211_wme_param); /* WME */ 1146 1147 m = ieee80211_getmgtframe(&frm, 1148 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 1149 if (m == NULL) { 1150 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1151 "%s: cannot get buf; size %u\n", __func__, pktlen); 1152 ic->ic_stats.is_tx_nobuf++; 1153 return NULL; 1154 } 1155 1156 memset(frm, 0, 8); /* timestamp should be filled later */ 1157 frm += 8; 1158 *(uint16_t *)frm = htole16(ni->ni_intval); 1159 frm += 2; 1160 capinfo = getcapinfo(ic, ni->ni_chan); 1161 *(uint16_t *)frm = htole16(capinfo); 1162 frm += 2; 1163 1164 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1165 frm = ieee80211_add_rates(frm, rs); 1166 1167 if (ic->ic_phytype == IEEE80211_T_FH) { 1168 *frm++ = IEEE80211_ELEMID_FHPARMS; 1169 *frm++ = 5; 1170 *frm++ = ni->ni_fhdwell & 0x00ff; 1171 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1172 *frm++ = IEEE80211_FH_CHANSET( 1173 ieee80211_chan2ieee(ic, ni->ni_chan)); 1174 *frm++ = IEEE80211_FH_CHANPAT( 1175 ieee80211_chan2ieee(ic, ni->ni_chan)); 1176 *frm++ = ni->ni_fhindex; 1177 } else { 1178 *frm++ = IEEE80211_ELEMID_DSPARMS; 1179 *frm++ = 1; 1180 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1181 } 1182 1183 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1184 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1185 *frm++ = 2; 1186 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1187 } 1188 if (ic->ic_flags & IEEE80211_F_WPA) 1189 frm = ieee80211_add_wpa(frm, ic); 1190 if (ic->ic_curmode == IEEE80211_MODE_11G) 1191 frm = ieee80211_add_erp(frm, ic); 1192 frm = ieee80211_add_xrates(frm, rs); 1193 if (ic->ic_flags & IEEE80211_F_WME) 1194 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1195 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1196 KKASSERT(m->m_len <= pktlen); 1197 1198 return m; 1199 } 1200 1201 /* 1202 * Send a management frame. The node is for the destination (or ic_bss 1203 * when in station mode). Nodes other than ic_bss have their reference 1204 * count bumped to reflect our use for an indeterminant time. 1205 */ 1206 int 1207 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1208 int type, int arg) 1209 { 1210 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1211 struct mbuf *m; 1212 uint8_t *frm; 1213 uint16_t capinfo; 1214 int has_challenge, is_shared_key, ret, timer, status, encrypt; 1215 const struct ieee80211_rateset *rs; 1216 1217 KASSERT(ni != NULL, ("null node")); 1218 1219 /* 1220 * Hold a reference on the node so it doesn't go away until after 1221 * the xmit is complete all the way in the driver. On error we 1222 * will remove our reference. 1223 */ 1224 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1225 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1226 __func__, __LINE__, 1227 ni, ni->ni_macaddr, ":", 1228 ieee80211_node_refcnt(ni) + 1); 1229 ieee80211_ref_node(ni); 1230 1231 encrypt = 0; 1232 timer = 0; 1233 switch (type) { 1234 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1235 m = _ieee80211_probe_resp_alloc(ic, ic->ic_bss); 1236 if (m == NULL) { 1237 /* NB: Statistics have been updated. */ 1238 ret = ENOMEM; 1239 goto bad; 1240 } 1241 break; 1242 1243 case IEEE80211_FC0_SUBTYPE_AUTH: 1244 status = arg >> 16; 1245 arg &= 0xffff; 1246 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1247 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1248 ni->ni_challenge != NULL); 1249 1250 /* 1251 * Deduce whether we're doing open authentication or 1252 * shared key authentication. We do the latter if 1253 * we're in the middle of a shared key authentication 1254 * handshake or if we're initiating an authentication 1255 * request and configured to use shared key. 1256 */ 1257 is_shared_key = has_challenge || 1258 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1259 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1260 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1261 1262 m = ieee80211_getmgtframe(&frm, 1263 ic->ic_headroom + sizeof(struct ieee80211_frame), 1264 3 * sizeof(uint16_t) 1265 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1266 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1267 ); 1268 if (m == NULL) 1269 senderr(ENOMEM, is_tx_nobuf); 1270 1271 ((uint16_t *)frm)[0] = 1272 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1273 : htole16(IEEE80211_AUTH_ALG_OPEN); 1274 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1275 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1276 1277 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1278 ((uint16_t *)frm)[3] = 1279 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1280 IEEE80211_ELEMID_CHALLENGE); 1281 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1282 IEEE80211_CHALLENGE_LEN); 1283 m->m_pkthdr.len = m->m_len = 1284 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1285 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1286 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1287 "[%6D] request encrypt frame (%s)\n", 1288 ni->ni_macaddr, ":", __func__); 1289 encrypt = 1; /* WEP-encrypt, please */ 1290 } 1291 } else 1292 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1293 1294 /* XXX not right for shared key */ 1295 if (status == IEEE80211_STATUS_SUCCESS) 1296 IEEE80211_NODE_STAT(ni, tx_auth); 1297 else 1298 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1299 1300 if (ic->ic_opmode == IEEE80211_M_STA) 1301 timer = IEEE80211_TRANS_WAIT; 1302 break; 1303 1304 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1305 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1306 "[%6D] send station deauthenticate (reason %d)\n", 1307 ni->ni_macaddr, ":", arg); 1308 m = ieee80211_getmgtframe(&frm, 1309 ic->ic_headroom + sizeof(struct ieee80211_frame), 1310 sizeof(uint16_t)); 1311 if (m == NULL) 1312 senderr(ENOMEM, is_tx_nobuf); 1313 *(uint16_t *)frm = htole16(arg); /* reason */ 1314 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1315 1316 IEEE80211_NODE_STAT(ni, tx_deauth); 1317 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1318 1319 ieee80211_node_unauthorize(ni); /* port closed */ 1320 break; 1321 1322 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1323 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1324 /* 1325 * asreq frame format 1326 * [2] capability information 1327 * [2] listen interval 1328 * [6*] current AP address (reassoc only) 1329 * [tlv] ssid 1330 * [tlv] supported rates 1331 * [tlv] extended supported rates 1332 * [tlv] WME 1333 * [tlv] user-specified ie's 1334 */ 1335 m = ieee80211_getmgtframe(&frm, 1336 ic->ic_headroom + sizeof(struct ieee80211_frame), 1337 sizeof(uint16_t) 1338 + sizeof(uint16_t) 1339 + IEEE80211_ADDR_LEN 1340 + 2 + IEEE80211_NWID_LEN 1341 + 2 + IEEE80211_RATE_SIZE 1342 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1343 + sizeof(struct ieee80211_wme_info) 1344 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1345 ); 1346 if (m == NULL) 1347 senderr(ENOMEM, is_tx_nobuf); 1348 1349 KASSERT(ic->ic_opmode == IEEE80211_M_STA, 1350 ("wrong mode %u", ic->ic_opmode)); 1351 capinfo = IEEE80211_CAPINFO_ESS; 1352 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1353 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1354 /* 1355 * NB: Some 11a AP's reject the request when 1356 * short premable or PBCC modulation is set. 1357 */ 1358 if (IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) { 1359 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 1360 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1361 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC) 1362 capinfo |= IEEE80211_CAPINFO_PBCC; 1363 } 1364 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan) && 1365 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1366 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1367 *(uint16_t *)frm = htole16(capinfo); 1368 frm += 2; 1369 1370 KKASSERT(ic->ic_bss->ni_intval != 0); 1371 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1372 ic->ic_bss->ni_intval)); 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 1382 rs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 1383 frm = ieee80211_add_rates(frm, rs); 1384 frm = ieee80211_add_xrates(frm, rs); 1385 1386 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1387 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1388 if (ic->ic_opt_ie != NULL) { 1389 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1390 frm += ic->ic_opt_ie_len; 1391 } 1392 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1393 1394 timer = IEEE80211_TRANS_WAIT; 1395 break; 1396 1397 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1398 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1399 /* 1400 * asreq frame format 1401 * [2] capability information 1402 * [2] status 1403 * [2] association ID 1404 * [tlv] supported rates 1405 * [tlv] extended supported rates 1406 * [tlv] WME (if enabled and STA enabled) 1407 */ 1408 m = ieee80211_getmgtframe(&frm, 1409 ic->ic_headroom + sizeof(struct ieee80211_frame), 1410 sizeof(uint16_t) 1411 + sizeof(uint16_t) 1412 + sizeof(uint16_t) 1413 + 2 + IEEE80211_RATE_SIZE 1414 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1415 + sizeof(struct ieee80211_wme_param) 1416 ); 1417 if (m == NULL) 1418 senderr(ENOMEM, is_tx_nobuf); 1419 1420 capinfo = getcapinfo(ic, ic->ic_curchan); 1421 *(uint16_t *)frm = htole16(capinfo); 1422 frm += 2; 1423 1424 *(uint16_t *)frm = htole16(arg); /* status */ 1425 frm += 2; 1426 1427 if (arg == IEEE80211_STATUS_SUCCESS) { 1428 *(uint16_t *)frm = htole16(ni->ni_associd); 1429 IEEE80211_NODE_STAT(ni, tx_assoc); 1430 } else 1431 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1432 frm += 2; 1433 1434 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO); 1435 rs = &ic->ic_sup_rates[ic->ic_curmode]; 1436 frm = ieee80211_add_rates(frm, rs); 1437 frm = ieee80211_add_xrates(frm, rs); 1438 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1439 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1440 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1441 break; 1442 1443 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1444 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1445 "[%6D] send station disassociate (reason %d)\n", 1446 ni->ni_macaddr, ":", arg); 1447 m = ieee80211_getmgtframe(&frm, 1448 ic->ic_headroom + sizeof(struct ieee80211_frame), 1449 sizeof(uint16_t)); 1450 if (m == NULL) 1451 senderr(ENOMEM, is_tx_nobuf); 1452 *(uint16_t *)frm = htole16(arg); /* reason */ 1453 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1454 1455 IEEE80211_NODE_STAT(ni, tx_disassoc); 1456 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1457 break; 1458 1459 default: 1460 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1461 "[%6D] invalid mgmt frame type %u\n", 1462 ni->ni_macaddr, ":", type); 1463 senderr(EINVAL, is_tx_unknownmgt); 1464 /* NOTREACHED */ 1465 } 1466 ret = ieee80211_mgmt_output(ic, ni, m, type, timer, encrypt); 1467 if (ret != 0) { 1468 bad: 1469 ieee80211_free_node(ni); 1470 } 1471 return ret; 1472 #undef senderr 1473 } 1474 1475 /* 1476 * Allocate a probe response frame and fillin the appropriate bits. 1477 */ 1478 struct mbuf * 1479 ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni) 1480 { 1481 struct ieee80211_frame *wh; 1482 struct mbuf *m; 1483 1484 m = _ieee80211_probe_resp_alloc(ic, ni); 1485 if (m == NULL) 1486 return NULL; 1487 1488 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1489 KASSERT(m != NULL, ("no space for 802.11 header?")); 1490 1491 wh = mtod(m, struct ieee80211_frame *); 1492 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1493 IEEE80211_FC0_SUBTYPE_PROBE_RESP; 1494 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1495 *(uint16_t *)wh->i_dur = 0; 1496 bzero(wh->i_addr1, sizeof(wh->i_addr1)); 1497 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1498 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1499 *(uint16_t *)wh->i_seq = 0; 1500 1501 return m; 1502 } 1503 1504 /* 1505 * Allocate a beacon frame and fillin the appropriate bits. 1506 */ 1507 struct mbuf * 1508 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1509 struct ieee80211_beacon_offsets *bo) 1510 { 1511 struct ifnet *ifp = ic->ic_ifp; 1512 struct ieee80211_frame *wh; 1513 struct mbuf *m; 1514 int pktlen; 1515 uint8_t *frm, *efrm; 1516 uint16_t capinfo; 1517 const struct ieee80211_rateset *rs; 1518 1519 /* 1520 * beacon frame format 1521 * [8] time stamp 1522 * [2] beacon interval 1523 * [2] cabability information 1524 * [tlv] ssid 1525 * [tlv] supported rates 1526 * [3] parameter set (DS) 1527 * [tlv] parameter set (IBSS/TIM) 1528 * [tlv] extended rate phy (ERP) 1529 * [tlv] extended supported rates 1530 * [tlv] WME parameters 1531 * [tlv] WPA/RSN parameters 1532 * XXX Vendor-specific OIDs (e.g. Atheros) 1533 * NB: we allocate the max space required for the TIM bitmap. 1534 */ 1535 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO); 1536 rs = &ic->ic_sup_rates[ic->ic_curmode]; 1537 pktlen = 8 /* time stamp */ 1538 + sizeof(uint16_t) /* beacon interval */ 1539 + sizeof(uint16_t) /* capabilities */ 1540 + 2 + ni->ni_esslen /* ssid */ 1541 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1542 + 2 + 1 /* DS parameters */ 1543 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1544 + 2 + 1 /* ERP */ 1545 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1546 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1547 sizeof(struct ieee80211_wme_param) : 0) 1548 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1549 2*sizeof(struct ieee80211_ie_wpa) : 0) 1550 ; 1551 m = ieee80211_getmgtframe(&frm, 1552 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 1553 if (m == NULL) { 1554 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1555 "%s: cannot get buf; size %u\n", __func__, pktlen); 1556 ic->ic_stats.is_tx_nobuf++; 1557 return NULL; 1558 } 1559 1560 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1561 frm += 8; 1562 *(uint16_t *)frm = htole16(ni->ni_intval); 1563 frm += 2; 1564 capinfo = getcapinfo(ic, ni->ni_chan); 1565 bo->bo_caps = (uint16_t *)frm; 1566 *(uint16_t *)frm = htole16(capinfo); 1567 frm += 2; 1568 *frm++ = IEEE80211_ELEMID_SSID; 1569 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1570 *frm++ = ni->ni_esslen; 1571 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1572 frm += ni->ni_esslen; 1573 } else 1574 *frm++ = 0; 1575 frm = ieee80211_add_rates(frm, rs); 1576 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1577 *frm++ = IEEE80211_ELEMID_DSPARMS; 1578 *frm++ = 1; 1579 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1580 } 1581 bo->bo_tim = frm; 1582 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1583 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1584 *frm++ = 2; 1585 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1586 bo->bo_tim_len = 0; 1587 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1588 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1589 1590 tie->tim_ie = IEEE80211_ELEMID_TIM; 1591 tie->tim_len = 4; /* length */ 1592 tie->tim_count = 0; /* DTIM count */ 1593 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1594 tie->tim_bitctl = 0; /* bitmap control */ 1595 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1596 frm += sizeof(struct ieee80211_tim_ie); 1597 bo->bo_tim_len = 1; 1598 } 1599 bo->bo_trailer = frm; 1600 if (ic->ic_flags & IEEE80211_F_WME) { 1601 bo->bo_wme = frm; 1602 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1603 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1604 } 1605 if (ic->ic_flags & IEEE80211_F_WPA) 1606 frm = ieee80211_add_wpa(frm, ic); 1607 if (ic->ic_curmode == IEEE80211_MODE_11G) { 1608 bo->bo_erp = frm; 1609 frm = ieee80211_add_erp(frm, ic); 1610 } 1611 efrm = ieee80211_add_xrates(frm, rs); 1612 bo->bo_trailer_len = efrm - bo->bo_trailer; 1613 m->m_pkthdr.len = m->m_len = efrm - mtod(m, uint8_t *); 1614 KKASSERT(m->m_len <= pktlen); 1615 1616 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1617 KASSERT(m != NULL, ("no space for 802.11 header?")); 1618 wh = mtod(m, struct ieee80211_frame *); 1619 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1620 IEEE80211_FC0_SUBTYPE_BEACON; 1621 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1622 *(uint16_t *)wh->i_dur = 0; 1623 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1624 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1625 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1626 *(uint16_t *)wh->i_seq = 0; 1627 1628 return m; 1629 } 1630 1631 /* 1632 * Update the dynamic parts of a beacon frame based on the current state. 1633 */ 1634 int 1635 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1636 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1637 { 1638 int len_changed = 0; 1639 uint16_t capinfo; 1640 1641 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer); 1642 1643 /* XXX faster to recalculate entirely or just changes? */ 1644 capinfo = getcapinfo(ic, ni->ni_chan); 1645 *bo->bo_caps = htole16(capinfo); 1646 1647 if (ic->ic_flags & IEEE80211_F_WME) { 1648 struct ieee80211_wme_state *wme = &ic->ic_wme; 1649 1650 /* 1651 * Check for agressive mode change. When there is 1652 * significant high priority traffic in the BSS 1653 * throttle back BE traffic by using conservative 1654 * parameters. Otherwise BE uses agressive params 1655 * to optimize performance of legacy/non-QoS traffic. 1656 */ 1657 if (wme->wme_flags & WME_F_AGGRMODE) { 1658 if (wme->wme_hipri_traffic > 1659 wme->wme_hipri_switch_thresh) { 1660 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1661 "%s: traffic %u, disable aggressive mode\n", 1662 __func__, wme->wme_hipri_traffic); 1663 wme->wme_flags &= ~WME_F_AGGRMODE; 1664 ieee80211_wme_updateparams(ic); 1665 wme->wme_hipri_traffic = 1666 wme->wme_hipri_switch_hysteresis; 1667 } else 1668 wme->wme_hipri_traffic = 0; 1669 } else { 1670 if (wme->wme_hipri_traffic <= 1671 wme->wme_hipri_switch_thresh) { 1672 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1673 "%s: traffic %u, enable aggressive mode\n", 1674 __func__, wme->wme_hipri_traffic); 1675 wme->wme_flags |= WME_F_AGGRMODE; 1676 ieee80211_wme_updateparams(ic); 1677 wme->wme_hipri_traffic = 0; 1678 } else 1679 wme->wme_hipri_traffic = 1680 wme->wme_hipri_switch_hysteresis; 1681 } 1682 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1683 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1684 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1685 } 1686 } 1687 1688 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1689 struct ieee80211_tim_ie *tie = 1690 (struct ieee80211_tim_ie *) bo->bo_tim; 1691 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1692 u_int timlen, timoff, i; 1693 /* 1694 * ATIM/DTIM needs updating. If it fits in the 1695 * current space allocated then just copy in the 1696 * new bits. Otherwise we need to move any trailing 1697 * data to make room. Note that we know there is 1698 * contiguous space because ieee80211_beacon_allocate 1699 * insures there is space in the mbuf to write a 1700 * maximal-size virtual bitmap (based on ic_max_aid). 1701 */ 1702 /* 1703 * Calculate the bitmap size and offset, copy any 1704 * trailer out of the way, and then copy in the 1705 * new bitmap and update the information element. 1706 * Note that the tim bitmap must contain at least 1707 * one byte and any offset must be even. 1708 */ 1709 if (ic->ic_ps_pending != 0) { 1710 timoff = 128; /* impossibly large */ 1711 for (i = 0; i < ic->ic_tim_len; i++) 1712 if (ic->ic_tim_bitmap[i]) { 1713 timoff = i &~ 1; 1714 break; 1715 } 1716 KASSERT(timoff != 128, ("tim bitmap empty!")); 1717 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1718 if (ic->ic_tim_bitmap[i]) 1719 break; 1720 timlen = 1 + (i - timoff); 1721 } else { 1722 timoff = 0; 1723 timlen = 1; 1724 } 1725 if (timlen != bo->bo_tim_len) { 1726 /* copy up/down trailer */ 1727 int adjust = tie->tim_bitmap+timlen 1728 - bo->bo_trailer; 1729 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust, 1730 bo->bo_trailer_len); 1731 bo->bo_trailer += adjust; 1732 bo->bo_wme += adjust; 1733 bo->bo_erp += adjust; 1734 bo->bo_tim_len = timlen; 1735 1736 /* update information element */ 1737 tie->tim_len = 3 + timlen; 1738 tie->tim_bitctl = timoff; 1739 len_changed = 1; 1740 } 1741 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1742 bo->bo_tim_len); 1743 1744 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1745 1746 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1747 "%s: TIM updated, pending %u, off %u, len %u\n", 1748 __func__, ic->ic_ps_pending, timoff, timlen); 1749 } 1750 /* count down DTIM period */ 1751 if (tie->tim_count == 0) 1752 tie->tim_count = tie->tim_period - 1; 1753 else 1754 tie->tim_count--; 1755 /* update state for buffered multicast frames on DTIM */ 1756 if (mcast && tie->tim_count == 0) 1757 tie->tim_bitctl |= 1; 1758 else 1759 tie->tim_bitctl &= ~1; 1760 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) { 1761 /* 1762 * ERP element needs updating. 1763 */ 1764 (void) ieee80211_add_erp(bo->bo_erp, ic); 1765 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE; 1766 } 1767 } 1768 1769 return len_changed; 1770 } 1771 1772 /* 1773 * Save an outbound packet for a node in power-save sleep state. 1774 * The new packet is placed on the node's saved queue, and the TIM 1775 * is changed, if necessary. 1776 */ 1777 void 1778 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1779 struct mbuf *m) 1780 { 1781 int qlen, age; 1782 1783 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer); 1784 1785 if (IF_QFULL(&ni->ni_savedq)) { 1786 IF_DROP(&ni->ni_savedq); 1787 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1788 "[%6D] pwr save q overflow, drops %d (size %d)\n", 1789 ni->ni_macaddr, ":", 1790 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1791 #ifdef IEEE80211_DEBUG 1792 if (ieee80211_msg_dumppkts(ic)) { 1793 ieee80211_dump_pkt(mtod(m, uint8_t *), m->m_len, 1794 -1, -1); 1795 } 1796 #endif 1797 m_freem(m); 1798 return; 1799 } 1800 /* 1801 * Tag the frame with it's expiry time and insert 1802 * it in the queue. The aging interval is 4 times 1803 * the listen interval specified by the station. 1804 * Frames that sit around too long are reclaimed 1805 * using this information. 1806 */ 1807 /* TU -> secs. XXX handle overflow? */ 1808 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000; 1809 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1810 1811 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1812 "[%6D] save frame with age %d, %u now queued\n", 1813 ni->ni_macaddr, ":", age, qlen); 1814 1815 if (qlen == 1) 1816 ic->ic_set_tim(ni, 1); 1817 } 1818 1819 uint8_t 1820 ieee80211_ack_rate(struct ieee80211_node *ni, uint8_t rate) 1821 { 1822 const struct ieee80211_rateset *rs = &ni->ni_rates; 1823 uint8_t ack_rate = 0; 1824 enum ieee80211_modtype modtype; 1825 int i; 1826 1827 rate &= IEEE80211_RATE_VAL; 1828 1829 modtype = ieee80211_rate2modtype(rate); 1830 1831 for (i = 0; i < rs->rs_nrates; ++i) { 1832 uint8_t rate1 = IEEE80211_RS_RATE(rs, i); 1833 1834 if (rate1 > rate) { 1835 if (ack_rate != 0) 1836 return ack_rate; 1837 else 1838 break; 1839 } 1840 1841 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 1842 ieee80211_rate2modtype(rate1) == modtype) 1843 ack_rate = rate1; 1844 } 1845 1846 switch (rate) { 1847 /* CCK */ 1848 case 2: 1849 case 4: 1850 case 11: 1851 case 22: 1852 ack_rate = rate; 1853 break; 1854 1855 /* PBCC */ 1856 case 44: 1857 ack_rate = 22; 1858 break; 1859 1860 /* OFDM */ 1861 case 12: 1862 case 18: 1863 ack_rate = 12; 1864 break; 1865 case 24: 1866 case 36: 1867 ack_rate = 24; 1868 break; 1869 case 48: 1870 case 72: 1871 case 96: 1872 case 108: 1873 ack_rate = 48; 1874 break; 1875 default: 1876 panic("unsupported rate %d\n", rate); 1877 } 1878 return ack_rate; 1879 } 1880 1881 /* IEEE Std 802.11a-1999, page 9, table 79 */ 1882 #define IEEE80211_OFDM_SYM_TIME 4 1883 #define IEEE80211_OFDM_PREAMBLE_TIME 16 1884 #define IEEE80211_OFDM_SIGNAL_TIME 4 1885 /* IEEE Std 802.11g-2003, page 44 */ 1886 #define IEEE80211_OFDM_SIGNAL_EXT_TIME 6 1887 1888 /* IEEE Std 802.11a-1999, page 7, figure 107 */ 1889 #define IEEE80211_OFDM_PLCP_SERVICE_NBITS 16 1890 #define IEEE80211_OFDM_TAIL_NBITS 6 1891 1892 #define IEEE80211_OFDM_NBITS(frmlen) \ 1893 (IEEE80211_OFDM_PLCP_SERVICE_NBITS + \ 1894 ((frmlen) * NBBY) + \ 1895 IEEE80211_OFDM_TAIL_NBITS) 1896 1897 #define IEEE80211_OFDM_NBITS_PER_SYM(kbps) \ 1898 (((kbps) * IEEE80211_OFDM_SYM_TIME) / 1000) 1899 1900 #define IEEE80211_OFDM_NSYMS(kbps, frmlen) \ 1901 howmany(IEEE80211_OFDM_NBITS((frmlen)), \ 1902 IEEE80211_OFDM_NBITS_PER_SYM((kbps))) 1903 1904 #define IEEE80211_OFDM_TXTIME(kbps, frmlen) \ 1905 (IEEE80211_OFDM_PREAMBLE_TIME + \ 1906 IEEE80211_OFDM_SIGNAL_TIME + \ 1907 (IEEE80211_OFDM_NSYMS((kbps), (frmlen)) * IEEE80211_OFDM_SYM_TIME)) 1908 1909 /* IEEE Std 802.11b-1999, page 28, subclause 18.3.4 */ 1910 #define IEEE80211_CCK_PREAMBLE_LEN 144 1911 #define IEEE80211_CCK_PLCP_HDR_TIME 48 1912 #define IEEE80211_CCK_SHPREAMBLE_LEN 72 1913 #define IEEE80211_CCK_SHPLCP_HDR_TIME 24 1914 1915 #define IEEE80211_CCK_NBITS(frmlen) ((frmlen) * NBBY) 1916 #define IEEE80211_CCK_TXTIME(kbps, frmlen) \ 1917 (((IEEE80211_CCK_NBITS((frmlen)) * 1000) + (kbps) - 1) / (kbps)) 1918 1919 uint16_t 1920 ieee80211_txtime(struct ieee80211_node *ni, u_int len, uint8_t rs_rate, 1921 uint32_t flags) 1922 { 1923 struct ieee80211com *ic = ni->ni_ic; 1924 enum ieee80211_modtype modtype; 1925 uint16_t txtime; 1926 int rate; 1927 1928 rs_rate &= IEEE80211_RATE_VAL; 1929 1930 rate = rs_rate * 500; /* ieee80211 rate -> kbps */ 1931 1932 modtype = ieee80211_rate2modtype(rs_rate); 1933 if (modtype == IEEE80211_MODTYPE_OFDM) { 1934 /* 1935 * IEEE Std 802.11a-1999, page 37, equation (29) 1936 * IEEE Std 802.11g-2003, page 44, equation (42) 1937 */ 1938 txtime = IEEE80211_OFDM_TXTIME(rate, len); 1939 if (ic->ic_curmode == IEEE80211_MODE_11G) 1940 txtime += IEEE80211_OFDM_SIGNAL_EXT_TIME; 1941 } else { 1942 /* 1943 * IEEE Std 802.11b-1999, page 28, subclause 18.3.4 1944 * IEEE Std 802.11g-2003, page 45, equation (43) 1945 */ 1946 if (modtype == IEEE80211_MODTYPE_PBCC) 1947 ++len; 1948 txtime = IEEE80211_CCK_TXTIME(rate, len); 1949 1950 /* 1951 * Short preamble is not applicable for DS 1Mbits/s 1952 */ 1953 if (rs_rate != 2 && (flags & IEEE80211_F_SHPREAMBLE)) { 1954 txtime += IEEE80211_CCK_SHPREAMBLE_LEN + 1955 IEEE80211_CCK_SHPLCP_HDR_TIME; 1956 } else { 1957 txtime += IEEE80211_CCK_PREAMBLE_LEN + 1958 IEEE80211_CCK_PLCP_HDR_TIME; 1959 } 1960 } 1961 return txtime; 1962 } 1963