1 /* $NetBSD: ieee80211_output.c,v 1.43 2006/02/19 07:52:43 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.34 2005/08/10 16:22:29 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.43 2006/02/19 07:52:43 dyoung Exp $"); 40 #endif 41 42 #include "opt_inet.h" 43 44 #ifdef __NetBSD__ 45 #include "bpfilter.h" 46 #endif /* __NetBSD__ */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/kernel.h> 52 #include <sys/endian.h> 53 #include <sys/errno.h> 54 #include <sys/proc.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_llc.h> 59 #include <net/if_media.h> 60 #include <net/if_arp.h> 61 #include <net/if_ether.h> 62 #include <net/if_llc.h> 63 #include <net/if_vlanvar.h> 64 65 #include <net80211/ieee80211_netbsd.h> 66 #include <net80211/ieee80211_var.h> 67 68 #if NBPFILTER > 0 69 #include <net/bpf.h> 70 #endif 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip.h> 77 #include <net/if_ether.h> 78 #endif 79 80 #ifdef IEEE80211_DEBUG 81 /* 82 * Decide if an outbound management frame should be 83 * printed when debugging is enabled. This filters some 84 * of the less interesting frames that come frequently 85 * (e.g. beacons). 86 */ 87 static __inline int 88 doprint(struct ieee80211com *ic, int subtype) 89 { 90 switch (subtype) { 91 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 92 return (ic->ic_opmode == IEEE80211_M_IBSS); 93 } 94 return 1; 95 } 96 #endif 97 98 /* 99 * Set the direction field and address fields of an outgoing 100 * non-QoS frame. Note this should be called early on in 101 * constructing a frame as it sets i_fc[1]; other bits can 102 * then be or'd in. 103 */ 104 static void 105 ieee80211_send_setup(struct ieee80211com *ic, 106 struct ieee80211_node *ni, 107 struct ieee80211_frame *wh, 108 int type, 109 const u_int8_t sa[IEEE80211_ADDR_LEN], 110 const u_int8_t da[IEEE80211_ADDR_LEN], 111 const u_int8_t bssid[IEEE80211_ADDR_LEN]) 112 { 113 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 114 115 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 116 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 117 switch (ic->ic_opmode) { 118 case IEEE80211_M_STA: 119 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 120 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 121 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 122 IEEE80211_ADDR_COPY(wh->i_addr3, da); 123 break; 124 case IEEE80211_M_IBSS: 125 case IEEE80211_M_AHDEMO: 126 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 127 IEEE80211_ADDR_COPY(wh->i_addr1, da); 128 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 129 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 130 break; 131 case IEEE80211_M_HOSTAP: 132 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 133 IEEE80211_ADDR_COPY(wh->i_addr1, da); 134 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 135 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 136 break; 137 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 138 break; 139 } 140 } else { 141 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 142 IEEE80211_ADDR_COPY(wh->i_addr1, da); 143 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 144 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 145 } 146 *(u_int16_t *)&wh->i_dur[0] = 0; 147 /* NB: use non-QoS tid */ 148 *(u_int16_t *)&wh->i_seq[0] = 149 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 150 ni->ni_txseqs[0]++; 151 #undef WH4 152 } 153 154 /* 155 * Send a management frame to the specified node. The node pointer 156 * must have a reference as the pointer will be passed to the driver 157 * and potentially held for a long time. If the frame is successfully 158 * dispatched to the driver, then it is responsible for freeing the 159 * reference (and potentially free'ing up any associated storage). 160 */ 161 static int 162 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 163 struct mbuf *m, int type, int timer) 164 { 165 struct ifnet *ifp = ic->ic_ifp; 166 struct ieee80211_frame *wh; 167 168 IASSERT(ni != NULL, ("null node")); 169 170 /* 171 * Yech, hack alert! We want to pass the node down to the 172 * driver's start routine. If we don't do so then the start 173 * routine must immediately look it up again and that can 174 * cause a lock order reversal if, for example, this frame 175 * is being sent because the station is being timedout and 176 * the frame being sent is a DEAUTH message. We could stick 177 * this in an m_tag and tack that on to the mbuf. However 178 * that's rather expensive to do for every frame so instead 179 * we stuff it in the rcvif field since outbound frames do 180 * not (presently) use this. 181 */ 182 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 183 if (m == NULL) 184 return ENOMEM; 185 #ifdef __FreeBSD__ 186 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 187 #endif 188 m->m_pkthdr.rcvif = (void *)ni; 189 190 wh = mtod(m, struct ieee80211_frame *); 191 ieee80211_send_setup(ic, ni, wh, 192 IEEE80211_FC0_TYPE_MGT | type, 193 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 194 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 195 m->m_flags &= ~M_LINK0; 196 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 197 "[%s] encrypting frame (%s)\n", 198 ether_sprintf(wh->i_addr1), __func__); 199 wh->i_fc[1] |= IEEE80211_FC1_WEP; 200 } 201 #ifdef IEEE80211_DEBUG 202 /* avoid printing too many frames */ 203 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 204 ieee80211_msg_dumppkts(ic)) { 205 printf("[%s] send %s on channel %u\n", 206 ether_sprintf(wh->i_addr1), 207 ieee80211_mgt_subtype_name[ 208 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 209 IEEE80211_FC0_SUBTYPE_SHIFT], 210 ieee80211_chan2ieee(ic, ic->ic_curchan)); 211 } 212 #endif 213 IEEE80211_NODE_STAT(ni, tx_mgmt); 214 IF_ENQUEUE(&ic->ic_mgtq, m); 215 if (timer) { 216 /* 217 * Set the mgt frame timeout. 218 */ 219 ic->ic_mgt_timer = timer; 220 ifp->if_timer = 1; 221 } 222 (*ifp->if_start)(ifp); 223 return 0; 224 } 225 226 /* 227 * Send a null data frame to the specified node. 228 * 229 * NB: the caller is assumed to have setup a node reference 230 * for use; this is necessary to deal with a race condition 231 * when probing for inactive stations. 232 */ 233 int 234 ieee80211_send_nulldata(struct ieee80211_node *ni) 235 { 236 struct ieee80211com *ic = ni->ni_ic; 237 struct ifnet *ifp = ic->ic_ifp; 238 struct mbuf *m; 239 struct ieee80211_frame *wh; 240 241 MGETHDR(m, M_NOWAIT, MT_HEADER); 242 if (m == NULL) { 243 /* XXX debug msg */ 244 ic->ic_stats.is_tx_nobuf++; 245 ieee80211_unref_node(&ni); 246 return ENOMEM; 247 } 248 m->m_pkthdr.rcvif = (void *) ni; 249 250 wh = mtod(m, struct ieee80211_frame *); 251 ieee80211_send_setup(ic, ni, wh, 252 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 253 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 254 /* NB: power management bit is never sent by an AP */ 255 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 256 ic->ic_opmode != IEEE80211_M_HOSTAP) 257 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 258 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 259 260 IEEE80211_NODE_STAT(ni, tx_data); 261 262 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 263 "[%s] send null data frame on channel %u, pwr mgt %s\n", 264 ether_sprintf(ni->ni_macaddr), 265 ieee80211_chan2ieee(ic, ic->ic_curchan), 266 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 267 268 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 269 (*ifp->if_start)(ifp); 270 271 return 0; 272 } 273 274 /* 275 * Assign priority to a frame based on any vlan tag assigned 276 * to the station and/or any Diffserv setting in an IP header. 277 * Finally, if an ACM policy is setup (in station mode) it's 278 * applied. 279 */ 280 int 281 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 282 { 283 int v_wme_ac, d_wme_ac, ac; 284 #ifdef INET 285 struct ether_header *eh; 286 #endif 287 288 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 289 ac = WME_AC_BE; 290 goto done; 291 } 292 293 /* 294 * If node has a vlan tag then all traffic 295 * to it must have a matching tag. 296 */ 297 v_wme_ac = 0; 298 if (ni->ni_vlan != 0) { 299 /* XXX used to check ec_nvlans. */ 300 struct m_tag *mtag = m_tag_find(m, PACKET_TAG_VLAN, NULL); 301 if (mtag == NULL) { 302 IEEE80211_NODE_STAT(ni, tx_novlantag); 303 return 1; 304 } 305 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 306 EVL_VLANOFTAG(ni->ni_vlan)) { 307 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 308 return 1; 309 } 310 /* map vlan priority to AC */ 311 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 312 case 1: 313 case 2: 314 v_wme_ac = WME_AC_BK; 315 break; 316 case 0: 317 case 3: 318 v_wme_ac = WME_AC_BE; 319 break; 320 case 4: 321 case 5: 322 v_wme_ac = WME_AC_VI; 323 break; 324 case 6: 325 case 7: 326 v_wme_ac = WME_AC_VO; 327 break; 328 } 329 } 330 331 #ifdef INET 332 eh = mtod(m, struct ether_header *); 333 if (eh->ether_type == htons(ETHERTYPE_IP)) { 334 const struct ip *ip = (struct ip *) 335 (mtod(m, u_int8_t *) + sizeof (*eh)); 336 /* 337 * IP frame, map the TOS field. 338 */ 339 switch (ip->ip_tos) { 340 case 0x08: 341 case 0x20: 342 d_wme_ac = WME_AC_BK; /* background */ 343 break; 344 case 0x28: 345 case 0xa0: 346 d_wme_ac = WME_AC_VI; /* video */ 347 break; 348 case 0x30: /* voice */ 349 case 0xe0: 350 case 0x88: /* XXX UPSD */ 351 case 0xb8: 352 d_wme_ac = WME_AC_VO; 353 break; 354 default: 355 d_wme_ac = WME_AC_BE; 356 break; 357 } 358 } else { 359 #endif /* INET */ 360 d_wme_ac = WME_AC_BE; 361 #ifdef INET 362 } 363 #endif 364 /* 365 * Use highest priority AC. 366 */ 367 if (v_wme_ac > d_wme_ac) 368 ac = v_wme_ac; 369 else 370 ac = d_wme_ac; 371 372 /* 373 * Apply ACM policy. 374 */ 375 if (ic->ic_opmode == IEEE80211_M_STA) { 376 static const int acmap[4] = { 377 WME_AC_BK, /* WME_AC_BE */ 378 WME_AC_BK, /* WME_AC_BK */ 379 WME_AC_BE, /* WME_AC_VI */ 380 WME_AC_VI, /* WME_AC_VO */ 381 }; 382 while (ac != WME_AC_BK && 383 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 384 ac = acmap[ac]; 385 } 386 done: 387 M_WME_SETAC(m, ac); 388 return 0; 389 } 390 391 /* 392 * Insure there is sufficient contiguous space to encapsulate the 393 * 802.11 data frame. If room isn't already there, arrange for it. 394 * Drivers and cipher modules assume we have done the necessary work 395 * and fail rudely if they don't find the space they need. 396 */ 397 static struct mbuf * 398 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 399 struct ieee80211_key *key, struct mbuf *m) 400 { 401 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 402 int needed_space = hdrsize; 403 int wlen = 0; 404 405 if (key != NULL) { 406 /* XXX belongs in crypto code? */ 407 needed_space += key->wk_cipher->ic_header; 408 /* XXX frags */ 409 } 410 /* 411 * We know we are called just before stripping an Ethernet 412 * header and prepending an LLC header. This means we know 413 * there will be 414 * sizeof(struct ether_header) - sizeof(struct llc) 415 * bytes recovered to which we need additional space for the 416 * 802.11 header and any crypto header. 417 */ 418 /* XXX check trailing space and copy instead? */ 419 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 420 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 421 if (n == NULL) { 422 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 423 "%s: cannot expand storage\n", __func__); 424 ic->ic_stats.is_tx_nobuf++; 425 m_freem(m); 426 return NULL; 427 } 428 IASSERT(needed_space <= MHLEN, 429 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 430 /* 431 * Setup new mbuf to have leading space to prepend the 432 * 802.11 header and any crypto header bits that are 433 * required (the latter are added when the driver calls 434 * back to ieee80211_crypto_encap to do crypto encapsulation). 435 */ 436 /* NB: must be first 'cuz it clobbers m_data */ 437 M_MOVE_PKTHDR(n, m); 438 n->m_len = 0; /* NB: m_gethdr does not set */ 439 n->m_data += needed_space; 440 /* 441 * Pull up Ethernet header to create the expected layout. 442 * We could use m_pullup but that's overkill (i.e. we don't 443 * need the actual data) and it cannot fail so do it inline 444 * for speed. 445 */ 446 /* NB: struct ether_header is known to be contiguous */ 447 n->m_len += sizeof(struct ether_header); 448 m->m_len -= sizeof(struct ether_header); 449 m->m_data += sizeof(struct ether_header); 450 /* 451 * Replace the head of the chain. 452 */ 453 n->m_next = m; 454 m = n; 455 } else { 456 /* We will overwrite the ethernet header in the 457 * 802.11 encapsulation stage. Make sure that it 458 * is writable. 459 */ 460 wlen = sizeof(struct ether_header); 461 } 462 463 /* 464 * If we're going to s/w encrypt the mbuf chain make sure it is 465 * writable. 466 */ 467 if (key != NULL && (key->wk_flags & IEEE80211_KEY_SWCRYPT) != 0) 468 wlen = M_COPYALL; 469 470 if (wlen != 0 && m_makewritable(&m, 0, wlen, M_DONTWAIT) != 0) { 471 m_freem(m); 472 return NULL; 473 } 474 return m; 475 #undef TO_BE_RECLAIMED 476 } 477 478 /* 479 * Return the transmit key to use in sending a unicast frame. 480 * If a unicast key is set we use that. When no unicast key is set 481 * we fall back to the default transmit key. 482 */ 483 static __inline struct ieee80211_key * 484 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 485 { 486 if (IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)) { 487 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 488 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 489 return NULL; 490 return &ic->ic_nw_keys[ic->ic_def_txkey]; 491 } else { 492 return &ni->ni_ucastkey; 493 } 494 } 495 496 /* 497 * Return the transmit key to use in sending a multicast frame. 498 * Multicast traffic always uses the group key which is installed as 499 * the default tx key. 500 */ 501 static __inline struct ieee80211_key * 502 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 503 { 504 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 505 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 506 return NULL; 507 return &ic->ic_nw_keys[ic->ic_def_txkey]; 508 } 509 510 /* 511 * Encapsulate an outbound data frame. The mbuf chain is updated. 512 * If an error is encountered NULL is returned. The caller is required 513 * to provide a node reference and pullup the ethernet header in the 514 * first mbuf. 515 */ 516 struct mbuf * 517 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 518 struct ieee80211_node *ni) 519 { 520 struct ether_header eh; 521 struct ieee80211_frame *wh; 522 struct ieee80211_key *key; 523 struct llc *llc; 524 int hdrsize, datalen, addqos; 525 526 IASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 527 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 528 529 /* 530 * Insure space for additional headers. First identify 531 * transmit key to use in calculating any buffer adjustments 532 * required. This is also used below to do privacy 533 * encapsulation work. Then calculate the 802.11 header 534 * size and any padding required by the driver. 535 * 536 * Note key may be NULL if we fall back to the default 537 * transmit key and that is not set. In that case the 538 * buffer may not be expanded as needed by the cipher 539 * routines, but they will/should discard it. 540 */ 541 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 542 if (ic->ic_opmode == IEEE80211_M_STA || 543 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 544 key = ieee80211_crypto_getucastkey(ic, ni); 545 else 546 key = ieee80211_crypto_getmcastkey(ic, ni); 547 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 548 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 549 "[%s] no default transmit key (%s) deftxkey %u\n", 550 ether_sprintf(eh.ether_dhost), __func__, 551 ic->ic_def_txkey); 552 ic->ic_stats.is_tx_nodefkey++; 553 } 554 } else 555 key = NULL; 556 /* XXX 4-address format */ 557 /* 558 * XXX Some ap's don't handle QoS-encapsulated EAPOL 559 * frames so suppress use. This may be an issue if other 560 * ap's require all data frames to be QoS-encapsulated 561 * once negotiated in which case we'll need to make this 562 * configurable. 563 */ 564 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 565 eh.ether_type != htons(ETHERTYPE_PAE); 566 if (addqos) 567 hdrsize = sizeof(struct ieee80211_qosframe); 568 else 569 hdrsize = sizeof(struct ieee80211_frame); 570 if (ic->ic_flags & IEEE80211_F_DATAPAD) 571 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 572 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 573 if (m == NULL) { 574 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 575 goto bad; 576 } 577 578 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 579 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 580 llc = mtod(m, struct llc *); 581 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 582 llc->llc_control = LLC_UI; 583 llc->llc_snap.org_code[0] = 0; 584 llc->llc_snap.org_code[1] = 0; 585 llc->llc_snap.org_code[2] = 0; 586 llc->llc_snap.ether_type = eh.ether_type; 587 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 588 589 M_PREPEND(m, hdrsize, M_DONTWAIT); 590 if (m == NULL) { 591 ic->ic_stats.is_tx_nobuf++; 592 goto bad; 593 } 594 wh = mtod(m, struct ieee80211_frame *); 595 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 596 *(u_int16_t *)wh->i_dur = 0; 597 switch (ic->ic_opmode) { 598 case IEEE80211_M_STA: 599 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 600 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 601 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 602 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 603 break; 604 case IEEE80211_M_IBSS: 605 case IEEE80211_M_AHDEMO: 606 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 607 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 608 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 609 /* 610 * NB: always use the bssid from ic_bss as the 611 * neighbor's may be stale after an ibss merge 612 */ 613 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 614 break; 615 case IEEE80211_M_HOSTAP: 616 #ifndef IEEE80211_NO_HOSTAP 617 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 618 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 619 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 620 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 621 #endif /* !IEEE80211_NO_HOSTAP */ 622 break; 623 case IEEE80211_M_MONITOR: 624 goto bad; 625 } 626 if (m->m_flags & M_MORE_DATA) 627 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 628 if (addqos) { 629 struct ieee80211_qosframe *qwh = 630 (struct ieee80211_qosframe *) wh; 631 int ac, tid; 632 633 ac = M_WME_GETAC(m); 634 /* map from access class/queue to 11e header priorty value */ 635 tid = WME_AC_TO_TID(ac); 636 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 637 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 638 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 639 qwh->i_qos[1] = 0; 640 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 641 642 *(u_int16_t *)wh->i_seq = 643 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 644 ni->ni_txseqs[tid]++; 645 } else { 646 *(u_int16_t *)wh->i_seq = 647 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 648 ni->ni_txseqs[0]++; 649 } 650 if (key != NULL) { 651 /* 652 * IEEE 802.1X: send EAPOL frames always in the clear. 653 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 654 */ 655 if (eh.ether_type != htons(ETHERTYPE_PAE) || 656 ((ic->ic_flags & IEEE80211_F_WPA) && 657 (ic->ic_opmode == IEEE80211_M_STA ? 658 !IEEE80211_KEY_UNDEFINED(*key) : 659 !IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)))) { 660 wh->i_fc[1] |= IEEE80211_FC1_WEP; 661 /* XXX do fragmentation */ 662 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 663 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 664 "[%s] enmic failed, discard frame\n", 665 ether_sprintf(eh.ether_dhost)); 666 ic->ic_stats.is_crypto_enmicfail++; 667 goto bad; 668 } 669 } 670 } 671 672 IEEE80211_NODE_STAT(ni, tx_data); 673 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 674 675 return m; 676 bad: 677 if (m != NULL) 678 m_freem(m); 679 return NULL; 680 } 681 682 /* 683 * Arguments in: 684 * 685 * paylen: payload length (no FCS, no WEP header) 686 * 687 * hdrlen: header length 688 * 689 * rate: MSDU speed, units 500kb/s 690 * 691 * flags: IEEE80211_F_SHPREAMBLE (use short preamble), 692 * IEEE80211_F_SHSLOT (use short slot length) 693 * 694 * Arguments out: 695 * 696 * d: 802.11 Duration field for RTS, 697 * 802.11 Duration field for data frame, 698 * PLCP Length for data frame, 699 * residual octets at end of data slot 700 */ 701 static int 702 ieee80211_compute_duration1(int len, int use_ack, uint32_t icflags, int rate, 703 struct ieee80211_duration *d) 704 { 705 int pre, ctsrate; 706 int ack, bitlen, data_dur, remainder; 707 708 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 709 * DATA reserves medium for SIFS | ACK 710 * 711 * XXXMYC: no ACK on multicast/broadcast or control packets 712 */ 713 714 bitlen = len * 8; 715 716 pre = IEEE80211_DUR_DS_SIFS; 717 if ((icflags & IEEE80211_F_SHPREAMBLE) != 0) 718 pre += IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR; 719 else 720 pre += IEEE80211_DUR_DS_LONG_PREAMBLE + IEEE80211_DUR_DS_SLOW_PLCPHDR; 721 722 d->d_residue = 0; 723 data_dur = (bitlen * 2) / rate; 724 remainder = (bitlen * 2) % rate; 725 if (remainder != 0) { 726 d->d_residue = (rate - remainder) / 16; 727 data_dur++; 728 } 729 730 switch (rate) { 731 case 2: /* 1 Mb/s */ 732 case 4: /* 2 Mb/s */ 733 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 734 ctsrate = 2; 735 break; 736 case 11: /* 5.5 Mb/s */ 737 case 22: /* 11 Mb/s */ 738 case 44: /* 22 Mb/s */ 739 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 740 ctsrate = 4; 741 break; 742 default: 743 /* TBD */ 744 return -1; 745 } 746 747 d->d_plcp_len = data_dur; 748 749 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 750 751 d->d_rts_dur = 752 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 753 pre + data_dur + 754 ack; 755 756 d->d_data_dur = ack; 757 758 return 0; 759 } 760 761 /* 762 * Arguments in: 763 * 764 * wh: 802.11 header 765 * 766 * paylen: payload length (no FCS, no WEP header) 767 * 768 * rate: MSDU speed, units 500kb/s 769 * 770 * fraglen: fragment length, set to maximum (or higher) for no 771 * fragmentation 772 * 773 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 774 * IEEE80211_F_SHPREAMBLE (use short preamble), 775 * IEEE80211_F_SHSLOT (use short slot length) 776 * 777 * Arguments out: 778 * 779 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 780 * of first/only fragment 781 * 782 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 783 * of last fragment 784 * 785 * ieee80211_compute_duration assumes crypto-encapsulation, if any, 786 * has already taken place. 787 */ 788 int 789 ieee80211_compute_duration(const struct ieee80211_frame_min *wh, 790 const struct ieee80211_key *wk, int len, 791 uint32_t icflags, int fraglen, int rate, struct ieee80211_duration *d0, 792 struct ieee80211_duration *dn, int *npktp, int debug) 793 { 794 int ack, rc; 795 int cryptolen, /* crypto overhead: header+trailer */ 796 firstlen, /* first fragment's payload + overhead length */ 797 hdrlen, /* header length w/o driver padding */ 798 lastlen, /* last fragment's payload length w/ overhead */ 799 lastlen0, /* last fragment's payload length w/o overhead */ 800 npkt, /* number of fragments */ 801 overlen, /* non-802.11 header overhead per fragment */ 802 paylen; /* payload length w/o overhead */ 803 804 hdrlen = ieee80211_anyhdrsize((const void *)wh); 805 806 /* Account for padding required by the driver. */ 807 if (icflags & IEEE80211_F_DATAPAD) 808 paylen = len - roundup(hdrlen, sizeof(u_int32_t)); 809 else 810 paylen = len - hdrlen; 811 812 overlen = IEEE80211_CRC_LEN; 813 814 if (wk != NULL) { 815 cryptolen = wk->wk_cipher->ic_header + 816 wk->wk_cipher->ic_trailer; 817 paylen -= cryptolen; 818 overlen += cryptolen; 819 } 820 821 npkt = paylen / fraglen; 822 lastlen0 = paylen % fraglen; 823 824 if (npkt == 0) /* no fragments */ 825 lastlen = paylen + overlen; 826 else if (lastlen0 != 0) { /* a short "tail" fragment */ 827 lastlen = lastlen0 + overlen; 828 npkt++; 829 } else /* full-length "tail" fragment */ 830 lastlen = fraglen + overlen; 831 832 if (npktp != NULL) 833 *npktp = npkt; 834 835 if (npkt > 1) 836 firstlen = fraglen + overlen; 837 else 838 firstlen = paylen + overlen; 839 840 if (debug) { 841 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 842 "fraglen %d overlen %d len %d rate %d icflags %08x\n", 843 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 844 overlen, len, rate, icflags); 845 } 846 847 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 848 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 849 850 rc = ieee80211_compute_duration1(firstlen + hdrlen, 851 ack, icflags, rate, d0); 852 if (rc == -1) 853 return rc; 854 855 if (npkt <= 1) { 856 *dn = *d0; 857 return 0; 858 } 859 return ieee80211_compute_duration1(lastlen + hdrlen, ack, icflags, rate, 860 dn); 861 } 862 863 /* 864 * Add a supported rates element id to a frame. 865 */ 866 static u_int8_t * 867 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 868 { 869 int nrates; 870 871 *frm++ = IEEE80211_ELEMID_RATES; 872 nrates = rs->rs_nrates; 873 if (nrates > IEEE80211_RATE_SIZE) 874 nrates = IEEE80211_RATE_SIZE; 875 *frm++ = nrates; 876 memcpy(frm, rs->rs_rates, nrates); 877 return frm + nrates; 878 } 879 880 /* 881 * Add an extended supported rates element id to a frame. 882 */ 883 static u_int8_t * 884 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 885 { 886 /* 887 * Add an extended supported rates element if operating in 11g mode. 888 */ 889 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 890 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 891 *frm++ = IEEE80211_ELEMID_XRATES; 892 *frm++ = nrates; 893 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 894 frm += nrates; 895 } 896 return frm; 897 } 898 899 /* 900 * Add an ssid elemet to a frame. 901 */ 902 static u_int8_t * 903 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 904 { 905 *frm++ = IEEE80211_ELEMID_SSID; 906 *frm++ = len; 907 memcpy(frm, ssid, len); 908 return frm + len; 909 } 910 911 /* 912 * Add an erp element to a frame. 913 */ 914 static u_int8_t * 915 ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 916 { 917 u_int8_t erp; 918 919 *frm++ = IEEE80211_ELEMID_ERP; 920 *frm++ = 1; 921 erp = 0; 922 if (ic->ic_nonerpsta != 0) 923 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 924 if (ic->ic_flags & IEEE80211_F_USEPROT) 925 erp |= IEEE80211_ERP_USE_PROTECTION; 926 if (ic->ic_flags & IEEE80211_F_USEBARKER) 927 erp |= IEEE80211_ERP_LONG_PREAMBLE; 928 *frm++ = erp; 929 return frm; 930 } 931 932 static u_int8_t * 933 ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 934 { 935 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 936 #define ADDSHORT(frm, v) do { \ 937 frm[0] = (v) & 0xff; \ 938 frm[1] = (v) >> 8; \ 939 frm += 2; \ 940 } while (0) 941 #define ADDSELECTOR(frm, sel) do { \ 942 memcpy(frm, sel, 4); \ 943 frm += 4; \ 944 } while (0) 945 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 946 static const u_int8_t cipher_suite[][4] = { 947 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 948 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 949 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 950 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 951 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 952 { WPA_OUI_BYTES, WPA_CSE_NULL }, 953 }; 954 static const u_int8_t wep104_suite[4] = 955 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 956 static const u_int8_t key_mgt_unspec[4] = 957 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 958 static const u_int8_t key_mgt_psk[4] = 959 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 960 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 961 u_int8_t *frm = ie; 962 u_int8_t *selcnt; 963 964 *frm++ = IEEE80211_ELEMID_VENDOR; 965 *frm++ = 0; /* length filled in below */ 966 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 967 frm += sizeof(oui); 968 ADDSHORT(frm, WPA_VERSION); 969 970 /* XXX filter out CKIP */ 971 972 /* multicast cipher */ 973 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 974 rsn->rsn_mcastkeylen >= 13) 975 ADDSELECTOR(frm, wep104_suite); 976 else 977 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 978 979 /* unicast cipher list */ 980 selcnt = frm; 981 ADDSHORT(frm, 0); /* selector count */ 982 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 983 selcnt[0]++; 984 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 985 } 986 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 987 selcnt[0]++; 988 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 989 } 990 991 /* authenticator selector list */ 992 selcnt = frm; 993 ADDSHORT(frm, 0); /* selector count */ 994 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 995 selcnt[0]++; 996 ADDSELECTOR(frm, key_mgt_unspec); 997 } 998 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 999 selcnt[0]++; 1000 ADDSELECTOR(frm, key_mgt_psk); 1001 } 1002 1003 /* optional capabilities */ 1004 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 1005 ADDSHORT(frm, rsn->rsn_caps); 1006 1007 /* calculate element length */ 1008 ie[1] = frm - ie - 2; 1009 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1010 ("WPA IE too big, %u > %zu", 1011 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1012 return frm; 1013 #undef ADDSHORT 1014 #undef ADDSELECTOR 1015 #undef WPA_OUI_BYTES 1016 } 1017 1018 static u_int8_t * 1019 ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 1020 { 1021 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 1022 #define ADDSHORT(frm, v) do { \ 1023 frm[0] = (v) & 0xff; \ 1024 frm[1] = (v) >> 8; \ 1025 frm += 2; \ 1026 } while (0) 1027 #define ADDSELECTOR(frm, sel) do { \ 1028 memcpy(frm, sel, 4); \ 1029 frm += 4; \ 1030 } while (0) 1031 static const u_int8_t cipher_suite[][4] = { 1032 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 1033 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 1034 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 1035 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 1036 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 1037 { RSN_OUI_BYTES, RSN_CSE_NULL }, 1038 }; 1039 static const u_int8_t wep104_suite[4] = 1040 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 1041 static const u_int8_t key_mgt_unspec[4] = 1042 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 1043 static const u_int8_t key_mgt_psk[4] = 1044 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 1045 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 1046 u_int8_t *frm = ie; 1047 u_int8_t *selcnt; 1048 1049 *frm++ = IEEE80211_ELEMID_RSN; 1050 *frm++ = 0; /* length filled in below */ 1051 ADDSHORT(frm, RSN_VERSION); 1052 1053 /* XXX filter out CKIP */ 1054 1055 /* multicast cipher */ 1056 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 1057 rsn->rsn_mcastkeylen >= 13) 1058 ADDSELECTOR(frm, wep104_suite); 1059 else 1060 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 1061 1062 /* unicast cipher list */ 1063 selcnt = frm; 1064 ADDSHORT(frm, 0); /* selector count */ 1065 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 1066 selcnt[0]++; 1067 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 1068 } 1069 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 1070 selcnt[0]++; 1071 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 1072 } 1073 1074 /* authenticator selector list */ 1075 selcnt = frm; 1076 ADDSHORT(frm, 0); /* selector count */ 1077 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 1078 selcnt[0]++; 1079 ADDSELECTOR(frm, key_mgt_unspec); 1080 } 1081 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 1082 selcnt[0]++; 1083 ADDSELECTOR(frm, key_mgt_psk); 1084 } 1085 1086 /* optional capabilities */ 1087 ADDSHORT(frm, rsn->rsn_caps); 1088 /* XXX PMKID */ 1089 1090 /* calculate element length */ 1091 ie[1] = frm - ie - 2; 1092 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1093 ("RSN IE too big, %u > %zu", 1094 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1095 return frm; 1096 #undef ADDSELECTOR 1097 #undef ADDSHORT 1098 #undef RSN_OUI_BYTES 1099 } 1100 1101 /* 1102 * Add a WPA/RSN element to a frame. 1103 */ 1104 static u_int8_t * 1105 ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 1106 { 1107 1108 IASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 1109 if (ic->ic_flags & IEEE80211_F_WPA2) 1110 frm = ieee80211_setup_rsn_ie(ic, frm); 1111 if (ic->ic_flags & IEEE80211_F_WPA1) 1112 frm = ieee80211_setup_wpa_ie(ic, frm); 1113 return frm; 1114 } 1115 1116 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1117 /* 1118 * Add a WME information element to a frame. 1119 */ 1120 static u_int8_t * 1121 ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 1122 { 1123 static const struct ieee80211_wme_info info = { 1124 .wme_id = IEEE80211_ELEMID_VENDOR, 1125 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1126 .wme_oui = { WME_OUI_BYTES }, 1127 .wme_type = WME_OUI_TYPE, 1128 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1129 .wme_version = WME_VERSION, 1130 .wme_info = 0, 1131 }; 1132 memcpy(frm, &info, sizeof(info)); 1133 return frm + sizeof(info); 1134 } 1135 1136 /* 1137 * Add a WME parameters element to a frame. 1138 */ 1139 static u_int8_t * 1140 ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 1141 { 1142 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1143 #define ADDSHORT(frm, v) do { \ 1144 frm[0] = (v) & 0xff; \ 1145 frm[1] = (v) >> 8; \ 1146 frm += 2; \ 1147 } while (0) 1148 /* NB: this works 'cuz a param has an info at the front */ 1149 static const struct ieee80211_wme_info param = { 1150 .wme_id = IEEE80211_ELEMID_VENDOR, 1151 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1152 .wme_oui = { WME_OUI_BYTES }, 1153 .wme_type = WME_OUI_TYPE, 1154 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1155 .wme_version = WME_VERSION, 1156 }; 1157 int i; 1158 1159 memcpy(frm, ¶m, sizeof(param)); 1160 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1161 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1162 *frm++ = 0; /* reserved field */ 1163 for (i = 0; i < WME_NUM_AC; i++) { 1164 const struct wmeParams *ac = 1165 &wme->wme_bssChanParams.cap_wmeParams[i]; 1166 *frm++ = SM(i, WME_PARAM_ACI) 1167 | SM(ac->wmep_acm, WME_PARAM_ACM) 1168 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1169 ; 1170 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1171 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1172 ; 1173 ADDSHORT(frm, ac->wmep_txopLimit); 1174 } 1175 return frm; 1176 #undef SM 1177 #undef ADDSHORT 1178 } 1179 #undef WME_OUI_BYTES 1180 1181 /* 1182 * Send a probe request frame with the specified ssid 1183 * and any optional information element data. 1184 */ 1185 int 1186 ieee80211_send_probereq(struct ieee80211_node *ni, 1187 const u_int8_t sa[IEEE80211_ADDR_LEN], 1188 const u_int8_t da[IEEE80211_ADDR_LEN], 1189 const u_int8_t bssid[IEEE80211_ADDR_LEN], 1190 const u_int8_t *ssid, size_t ssidlen, 1191 const void *optie, size_t optielen) 1192 { 1193 struct ieee80211com *ic = ni->ni_ic; 1194 enum ieee80211_phymode mode; 1195 struct ieee80211_frame *wh; 1196 struct mbuf *m; 1197 u_int8_t *frm; 1198 1199 /* 1200 * Hold a reference on the node so it doesn't go away until after 1201 * the xmit is complete all the way in the driver. On error we 1202 * will remove our reference. 1203 */ 1204 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1205 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1206 __func__, __LINE__, 1207 ni, ether_sprintf(ni->ni_macaddr), 1208 ieee80211_node_refcnt(ni)+1); 1209 ieee80211_ref_node(ni); 1210 1211 /* 1212 * prreq frame format 1213 * [tlv] ssid 1214 * [tlv] supported rates 1215 * [tlv] extended supported rates 1216 * [tlv] user-specified ie's 1217 */ 1218 m = ieee80211_getmgtframe(&frm, 1219 2 + IEEE80211_NWID_LEN 1220 + 2 + IEEE80211_RATE_SIZE 1221 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1222 + (optie != NULL ? optielen : 0) 1223 ); 1224 if (m == NULL) { 1225 ic->ic_stats.is_tx_nobuf++; 1226 ieee80211_free_node(ni); 1227 return ENOMEM; 1228 } 1229 1230 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1231 mode = ieee80211_chan2mode(ic, ic->ic_curchan); 1232 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1233 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1234 1235 if (optie != NULL) { 1236 memcpy(frm, optie, optielen); 1237 frm += optielen; 1238 } 1239 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1240 1241 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1242 if (m == NULL) 1243 return ENOMEM; 1244 IASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1245 m->m_pkthdr.rcvif = (void *)ni; 1246 1247 wh = mtod(m, struct ieee80211_frame *); 1248 ieee80211_send_setup(ic, ni, wh, 1249 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1250 sa, da, bssid); 1251 /* XXX power management? */ 1252 1253 IEEE80211_NODE_STAT(ni, tx_probereq); 1254 IEEE80211_NODE_STAT(ni, tx_mgmt); 1255 1256 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1257 "[%s] send probe req on channel %u\n", 1258 ether_sprintf(wh->i_addr1), 1259 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1260 1261 IF_ENQUEUE(&ic->ic_mgtq, m); 1262 (*ic->ic_ifp->if_start)(ic->ic_ifp); 1263 return 0; 1264 } 1265 1266 /* 1267 * Send a management frame. The node is for the destination (or ic_bss 1268 * when in station mode). Nodes other than ic_bss have their reference 1269 * count bumped to reflect our use for an indeterminant time. 1270 */ 1271 int 1272 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1273 int type, int arg) 1274 { 1275 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1276 struct mbuf *m; 1277 u_int8_t *frm; 1278 u_int16_t capinfo; 1279 int has_challenge, is_shared_key, ret, timer, status; 1280 1281 IASSERT(ni != NULL, ("null node")); 1282 1283 /* 1284 * Hold a reference on the node so it doesn't go away until after 1285 * the xmit is complete all the way in the driver. On error we 1286 * will remove our reference. 1287 */ 1288 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1289 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1290 __func__, __LINE__, 1291 ni, ether_sprintf(ni->ni_macaddr), 1292 ieee80211_node_refcnt(ni)+1); 1293 ieee80211_ref_node(ni); 1294 1295 timer = 0; 1296 switch (type) { 1297 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1298 /* 1299 * probe response frame format 1300 * [8] time stamp 1301 * [2] beacon interval 1302 * [2] cabability information 1303 * [tlv] ssid 1304 * [tlv] supported rates 1305 * [tlv] parameter set (FH/DS) 1306 * [tlv] parameter set (IBSS) 1307 * [tlv] extended rate phy (ERP) 1308 * [tlv] extended supported rates 1309 * [tlv] WPA 1310 * [tlv] WME (optional) 1311 */ 1312 m = ieee80211_getmgtframe(&frm, 1313 8 1314 + sizeof(u_int16_t) 1315 + sizeof(u_int16_t) 1316 + 2 + IEEE80211_NWID_LEN 1317 + 2 + IEEE80211_RATE_SIZE 1318 + 7 /* max(7,3) */ 1319 + 6 1320 + 3 1321 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1322 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1323 + (ic->ic_flags & IEEE80211_F_WPA ? 1324 2*sizeof(struct ieee80211_ie_wpa) : 0) 1325 + sizeof(struct ieee80211_wme_param) 1326 ); 1327 if (m == NULL) 1328 senderr(ENOMEM, is_tx_nobuf); 1329 1330 memset(frm, 0, 8); /* timestamp should be filled later */ 1331 frm += 8; 1332 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1333 frm += 2; 1334 if (ic->ic_opmode == IEEE80211_M_IBSS) 1335 capinfo = IEEE80211_CAPINFO_IBSS; 1336 else 1337 capinfo = IEEE80211_CAPINFO_ESS; 1338 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1339 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1340 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1341 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1342 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1343 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1344 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1345 *(u_int16_t *)frm = htole16(capinfo); 1346 frm += 2; 1347 1348 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1349 ic->ic_bss->ni_esslen); 1350 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1351 1352 if (ic->ic_phytype == IEEE80211_T_FH) { 1353 *frm++ = IEEE80211_ELEMID_FHPARMS; 1354 *frm++ = 5; 1355 *frm++ = ni->ni_fhdwell & 0x00ff; 1356 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1357 *frm++ = IEEE80211_FH_CHANSET( 1358 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1359 *frm++ = IEEE80211_FH_CHANPAT( 1360 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1361 *frm++ = ni->ni_fhindex; 1362 } else { 1363 *frm++ = IEEE80211_ELEMID_DSPARMS; 1364 *frm++ = 1; 1365 *frm++ = ieee80211_chan2ieee(ic, ic->ic_curchan); 1366 } 1367 1368 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1369 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1370 *frm++ = 2; 1371 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1372 } 1373 if (ic->ic_flags & IEEE80211_F_WPA) 1374 frm = ieee80211_add_wpa(frm, ic); 1375 if (ic->ic_curmode == IEEE80211_MODE_11G) 1376 frm = ieee80211_add_erp(frm, ic); 1377 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1378 if (ic->ic_flags & IEEE80211_F_WME) 1379 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1380 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1381 break; 1382 1383 case IEEE80211_FC0_SUBTYPE_AUTH: 1384 status = arg >> 16; 1385 arg &= 0xffff; 1386 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1387 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1388 ni->ni_challenge != NULL); 1389 1390 /* 1391 * Deduce whether we're doing open authentication or 1392 * shared key authentication. We do the latter if 1393 * we're in the middle of a shared key authentication 1394 * handshake or if we're initiating an authentication 1395 * request and configured to use shared key. 1396 */ 1397 is_shared_key = has_challenge || 1398 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1399 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1400 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1401 1402 m = ieee80211_getmgtframe(&frm, 1403 3 * sizeof(u_int16_t) 1404 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1405 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1406 ); 1407 if (m == NULL) 1408 senderr(ENOMEM, is_tx_nobuf); 1409 1410 ((u_int16_t *)frm)[0] = 1411 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1412 : htole16(IEEE80211_AUTH_ALG_OPEN); 1413 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1414 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1415 1416 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1417 ((u_int16_t *)frm)[3] = 1418 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1419 IEEE80211_ELEMID_CHALLENGE); 1420 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1421 IEEE80211_CHALLENGE_LEN); 1422 m->m_pkthdr.len = m->m_len = 1423 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1424 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1425 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1426 "[%s] request encrypt frame (%s)\n", 1427 ether_sprintf(ni->ni_macaddr), __func__); 1428 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1429 } 1430 } else 1431 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1432 1433 /* XXX not right for shared key */ 1434 if (status == IEEE80211_STATUS_SUCCESS) 1435 IEEE80211_NODE_STAT(ni, tx_auth); 1436 else 1437 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1438 1439 if (ic->ic_opmode == IEEE80211_M_STA) 1440 timer = IEEE80211_TRANS_WAIT; 1441 break; 1442 1443 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1444 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1445 "[%s] send station deauthenticate (reason %d)\n", 1446 ether_sprintf(ni->ni_macaddr), arg); 1447 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1448 if (m == NULL) 1449 senderr(ENOMEM, is_tx_nobuf); 1450 *(u_int16_t *)frm = htole16(arg); /* reason */ 1451 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1452 1453 IEEE80211_NODE_STAT(ni, tx_deauth); 1454 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1455 1456 ieee80211_node_unauthorize(ni); /* port closed */ 1457 break; 1458 1459 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1460 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1461 /* 1462 * asreq frame format 1463 * [2] capability information 1464 * [2] listen interval 1465 * [6*] current AP address (reassoc only) 1466 * [tlv] ssid 1467 * [tlv] supported rates 1468 * [tlv] extended supported rates 1469 * [tlv] WME 1470 * [tlv] user-specified ie's 1471 */ 1472 m = ieee80211_getmgtframe(&frm, 1473 sizeof(u_int16_t) 1474 + sizeof(u_int16_t) 1475 + IEEE80211_ADDR_LEN 1476 + 2 + IEEE80211_NWID_LEN 1477 + 2 + IEEE80211_RATE_SIZE 1478 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1479 + sizeof(struct ieee80211_wme_info) 1480 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1481 ); 1482 if (m == NULL) 1483 senderr(ENOMEM, is_tx_nobuf); 1484 1485 capinfo = 0; 1486 if (ic->ic_opmode == IEEE80211_M_IBSS) 1487 capinfo |= IEEE80211_CAPINFO_IBSS; 1488 else /* IEEE80211_M_STA */ 1489 capinfo |= IEEE80211_CAPINFO_ESS; 1490 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1491 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1492 /* 1493 * NB: Some 11a AP's reject the request when 1494 * short premable is set. 1495 */ 1496 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1497 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1498 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1499 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1500 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1501 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1502 *(u_int16_t *)frm = htole16(capinfo); 1503 frm += 2; 1504 1505 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1506 frm += 2; 1507 1508 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1509 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1510 frm += IEEE80211_ADDR_LEN; 1511 } 1512 1513 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1514 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1515 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1516 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1517 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1518 if (ic->ic_opt_ie != NULL) { 1519 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1520 frm += ic->ic_opt_ie_len; 1521 } 1522 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1523 1524 timer = IEEE80211_TRANS_WAIT; 1525 break; 1526 1527 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1528 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1529 /* 1530 * asreq frame format 1531 * [2] capability information 1532 * [2] status 1533 * [2] association ID 1534 * [tlv] supported rates 1535 * [tlv] extended supported rates 1536 * [tlv] WME (if enabled and STA enabled) 1537 */ 1538 m = ieee80211_getmgtframe(&frm, 1539 sizeof(u_int16_t) 1540 + sizeof(u_int16_t) 1541 + sizeof(u_int16_t) 1542 + 2 + IEEE80211_RATE_SIZE 1543 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1544 + sizeof(struct ieee80211_wme_param) 1545 ); 1546 if (m == NULL) 1547 senderr(ENOMEM, is_tx_nobuf); 1548 1549 capinfo = IEEE80211_CAPINFO_ESS; 1550 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1551 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1552 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1553 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1554 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1555 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1556 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1557 *(u_int16_t *)frm = htole16(capinfo); 1558 frm += 2; 1559 1560 *(u_int16_t *)frm = htole16(arg); /* status */ 1561 frm += 2; 1562 1563 if (arg == IEEE80211_STATUS_SUCCESS) { 1564 *(u_int16_t *)frm = htole16(ni->ni_associd); 1565 IEEE80211_NODE_STAT(ni, tx_assoc); 1566 } else 1567 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1568 frm += 2; 1569 1570 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1571 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1572 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1573 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1574 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1575 break; 1576 1577 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1578 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1579 "[%s] send station disassociate (reason %d)\n", 1580 ether_sprintf(ni->ni_macaddr), arg); 1581 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1582 if (m == NULL) 1583 senderr(ENOMEM, is_tx_nobuf); 1584 *(u_int16_t *)frm = htole16(arg); /* reason */ 1585 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1586 1587 IEEE80211_NODE_STAT(ni, tx_disassoc); 1588 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1589 break; 1590 1591 default: 1592 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1593 "[%s] invalid mgmt frame type %u\n", 1594 ether_sprintf(ni->ni_macaddr), type); 1595 senderr(EINVAL, is_tx_unknownmgt); 1596 /* NOTREACHED */ 1597 } 1598 ret = ieee80211_mgmt_output(ic, ni, m, type, timer); 1599 if (ret != 0) { 1600 bad: 1601 ieee80211_free_node(ni); 1602 } 1603 return ret; 1604 #undef senderr 1605 } 1606 1607 /* 1608 * Allocate a beacon frame and fillin the appropriate bits. 1609 */ 1610 struct mbuf * 1611 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1612 struct ieee80211_beacon_offsets *bo) 1613 { 1614 struct ifnet *ifp = ic->ic_ifp; 1615 struct ieee80211_frame *wh; 1616 struct mbuf *m; 1617 int pktlen; 1618 u_int8_t *frm, *efrm; 1619 u_int16_t capinfo; 1620 struct ieee80211_rateset *rs; 1621 1622 /* 1623 * beacon frame format 1624 * [8] time stamp 1625 * [2] beacon interval 1626 * [2] cabability information 1627 * [tlv] ssid 1628 * [tlv] supported rates 1629 * [3] parameter set (DS) 1630 * [tlv] parameter set (IBSS/TIM) 1631 * [tlv] extended rate phy (ERP) 1632 * [tlv] extended supported rates 1633 * [tlv] WME parameters 1634 * [tlv] WPA/RSN parameters 1635 * XXX Vendor-specific OIDs (e.g. Atheros) 1636 * NB: we allocate the max space required for the TIM bitmap. 1637 */ 1638 rs = &ni->ni_rates; 1639 pktlen = 8 /* time stamp */ 1640 + sizeof(u_int16_t) /* beacon interval */ 1641 + sizeof(u_int16_t) /* capabilities */ 1642 + 2 + ni->ni_esslen /* ssid */ 1643 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1644 + 2 + 1 /* DS parameters */ 1645 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1646 + 2 + 1 /* ERP */ 1647 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1648 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1649 sizeof(struct ieee80211_wme_param) : 0) 1650 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1651 2*sizeof(struct ieee80211_ie_wpa) : 0) 1652 ; 1653 m = ieee80211_getmgtframe(&frm, pktlen); 1654 if (m == NULL) { 1655 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1656 "%s: cannot get buf; size %u\n", __func__, pktlen); 1657 ic->ic_stats.is_tx_nobuf++; 1658 return NULL; 1659 } 1660 1661 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1662 frm += 8; 1663 *(u_int16_t *)frm = htole16(ni->ni_intval); 1664 frm += 2; 1665 if (ic->ic_opmode == IEEE80211_M_IBSS) 1666 capinfo = IEEE80211_CAPINFO_IBSS; 1667 else 1668 capinfo = IEEE80211_CAPINFO_ESS; 1669 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1670 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1671 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1672 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1673 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1674 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1675 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1676 bo->bo_caps = (u_int16_t *)frm; 1677 *(u_int16_t *)frm = htole16(capinfo); 1678 frm += 2; 1679 *frm++ = IEEE80211_ELEMID_SSID; 1680 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1681 *frm++ = ni->ni_esslen; 1682 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1683 frm += ni->ni_esslen; 1684 } else 1685 *frm++ = 0; 1686 frm = ieee80211_add_rates(frm, rs); 1687 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1688 *frm++ = IEEE80211_ELEMID_DSPARMS; 1689 *frm++ = 1; 1690 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1691 } 1692 bo->bo_tim = frm; 1693 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1694 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1695 *frm++ = 2; 1696 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1697 bo->bo_tim_len = 0; 1698 } else { 1699 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1700 1701 tie->tim_ie = IEEE80211_ELEMID_TIM; 1702 tie->tim_len = 4; /* length */ 1703 tie->tim_count = 0; /* DTIM count */ 1704 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1705 tie->tim_bitctl = 0; /* bitmap control */ 1706 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1707 frm += sizeof(struct ieee80211_tim_ie); 1708 bo->bo_tim_len = 1; 1709 } 1710 bo->bo_trailer = frm; 1711 if (ic->ic_flags & IEEE80211_F_WME) { 1712 bo->bo_wme = frm; 1713 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1714 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1715 } 1716 if (ic->ic_flags & IEEE80211_F_WPA) 1717 frm = ieee80211_add_wpa(frm, ic); 1718 if (ic->ic_curmode == IEEE80211_MODE_11G) 1719 frm = ieee80211_add_erp(frm, ic); 1720 efrm = ieee80211_add_xrates(frm, rs); 1721 bo->bo_trailer_len = efrm - bo->bo_trailer; 1722 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1723 1724 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1725 IASSERT(m != NULL, ("no space for 802.11 header?")); 1726 wh = mtod(m, struct ieee80211_frame *); 1727 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1728 IEEE80211_FC0_SUBTYPE_BEACON; 1729 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1730 *(u_int16_t *)wh->i_dur = 0; 1731 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1732 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1733 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1734 *(u_int16_t *)wh->i_seq = 0; 1735 1736 return m; 1737 } 1738 1739 /* 1740 * Update the dynamic parts of a beacon frame based on the current state. 1741 */ 1742 int 1743 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1744 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1745 { 1746 int len_changed = 0; 1747 u_int16_t capinfo; 1748 1749 IEEE80211_BEACON_LOCK(ic); 1750 /* XXX faster to recalculate entirely or just changes? */ 1751 if (ic->ic_opmode == IEEE80211_M_IBSS) 1752 capinfo = IEEE80211_CAPINFO_IBSS; 1753 else 1754 capinfo = IEEE80211_CAPINFO_ESS; 1755 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1756 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1757 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1758 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1759 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1760 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1761 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1762 *bo->bo_caps = htole16(capinfo); 1763 1764 if (ic->ic_flags & IEEE80211_F_WME) { 1765 struct ieee80211_wme_state *wme = &ic->ic_wme; 1766 1767 /* 1768 * Check for agressive mode change. When there is 1769 * significant high priority traffic in the BSS 1770 * throttle back BE traffic by using conservative 1771 * parameters. Otherwise BE uses agressive params 1772 * to optimize performance of legacy/non-QoS traffic. 1773 */ 1774 if (wme->wme_flags & WME_F_AGGRMODE) { 1775 if (wme->wme_hipri_traffic > 1776 wme->wme_hipri_switch_thresh) { 1777 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1778 "%s: traffic %u, disable aggressive mode\n", 1779 __func__, wme->wme_hipri_traffic); 1780 wme->wme_flags &= ~WME_F_AGGRMODE; 1781 ieee80211_wme_updateparams_locked(ic); 1782 wme->wme_hipri_traffic = 1783 wme->wme_hipri_switch_hysteresis; 1784 } else 1785 wme->wme_hipri_traffic = 0; 1786 } else { 1787 if (wme->wme_hipri_traffic <= 1788 wme->wme_hipri_switch_thresh) { 1789 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1790 "%s: traffic %u, enable aggressive mode\n", 1791 __func__, wme->wme_hipri_traffic); 1792 wme->wme_flags |= WME_F_AGGRMODE; 1793 ieee80211_wme_updateparams_locked(ic); 1794 wme->wme_hipri_traffic = 0; 1795 } else 1796 wme->wme_hipri_traffic = 1797 wme->wme_hipri_switch_hysteresis; 1798 } 1799 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1800 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1801 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1802 } 1803 } 1804 1805 #ifndef IEEE80211_NO_HOSTAP 1806 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1807 struct ieee80211_tim_ie *tie = 1808 (struct ieee80211_tim_ie *) bo->bo_tim; 1809 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1810 u_int timlen, timoff, i; 1811 /* 1812 * ATIM/DTIM needs updating. If it fits in the 1813 * current space allocated then just copy in the 1814 * new bits. Otherwise we need to move any trailing 1815 * data to make room. Note that we know there is 1816 * contiguous space because ieee80211_beacon_allocate 1817 * insures there is space in the mbuf to write a 1818 * maximal-size virtual bitmap (based on ic_max_aid). 1819 */ 1820 /* 1821 * Calculate the bitmap size and offset, copy any 1822 * trailer out of the way, and then copy in the 1823 * new bitmap and update the information element. 1824 * Note that the tim bitmap must contain at least 1825 * one byte and any offset must be even. 1826 */ 1827 if (ic->ic_ps_pending != 0) { 1828 timoff = 128; /* impossibly large */ 1829 for (i = 0; i < ic->ic_tim_len; i++) 1830 if (ic->ic_tim_bitmap[i]) { 1831 timoff = i &~ 1; 1832 break; 1833 } 1834 IASSERT(timoff != 128, ("tim bitmap empty!")); 1835 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1836 if (ic->ic_tim_bitmap[i]) 1837 break; 1838 timlen = 1 + (i - timoff); 1839 } else { 1840 timoff = 0; 1841 timlen = 1; 1842 } 1843 if (timlen != bo->bo_tim_len) { 1844 /* copy up/down trailer */ 1845 ovbcopy(bo->bo_trailer, tie->tim_bitmap+timlen, 1846 bo->bo_trailer_len); 1847 bo->bo_trailer = tie->tim_bitmap+timlen; 1848 bo->bo_wme = bo->bo_trailer; 1849 bo->bo_tim_len = timlen; 1850 1851 /* update information element */ 1852 tie->tim_len = 3 + timlen; 1853 tie->tim_bitctl = timoff; 1854 len_changed = 1; 1855 } 1856 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1857 bo->bo_tim_len); 1858 1859 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1860 1861 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1862 "%s: TIM updated, pending %u, off %u, len %u\n", 1863 __func__, ic->ic_ps_pending, timoff, timlen); 1864 } 1865 /* count down DTIM period */ 1866 if (tie->tim_count == 0) 1867 tie->tim_count = tie->tim_period - 1; 1868 else 1869 tie->tim_count--; 1870 /* update state for buffered multicast frames on DTIM */ 1871 if (mcast && (tie->tim_count == 1 || tie->tim_period == 1)) 1872 tie->tim_bitctl |= 1; 1873 else 1874 tie->tim_bitctl &= ~1; 1875 } 1876 #endif /* !IEEE80211_NO_HOSTAP */ 1877 IEEE80211_BEACON_UNLOCK(ic); 1878 1879 return len_changed; 1880 } 1881 1882 /* 1883 * Save an outbound packet for a node in power-save sleep state. 1884 * The new packet is placed on the node's saved queue, and the TIM 1885 * is changed, if necessary. 1886 */ 1887 void 1888 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1889 struct mbuf *m) 1890 { 1891 int qlen, age; 1892 1893 IEEE80211_NODE_SAVEQ_LOCK(ni); 1894 if (IF_QFULL(&ni->ni_savedq)) { 1895 IF_DROP(&ni->ni_savedq); 1896 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1897 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1898 "[%s] pwr save q overflow, drops %d (size %d)\n", 1899 ether_sprintf(ni->ni_macaddr), 1900 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1901 #ifdef IEEE80211_DEBUG 1902 if (ieee80211_msg_dumppkts(ic)) 1903 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1904 #endif 1905 m_freem(m); 1906 return; 1907 } 1908 /* 1909 * Tag the frame with it's expiry time and insert 1910 * it in the queue. The aging interval is 4 times 1911 * the listen interval specified by the station. 1912 * Frames that sit around too long are reclaimed 1913 * using this information. 1914 */ 1915 /* XXX handle overflow? */ 1916 age = ((ni->ni_intval * ic->ic_bintval) << 2) / 1024; /* TU -> secs */ 1917 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1918 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1919 1920 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1921 "[%s] save frame with age %d, %u now queued\n", 1922 ether_sprintf(ni->ni_macaddr), age, qlen); 1923 1924 if (qlen == 1) 1925 ic->ic_set_tim(ni, 1); 1926 } 1927