ieee80211_output.c revision 170360
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2007 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 170360 2007-06-06 04:56:04Z sam $"); 29 30#include "opt_inet.h" 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/mbuf.h> 35#include <sys/kernel.h> 36#include <sys/endian.h> 37 38#include <sys/socket.h> 39 40#include <net/bpf.h> 41#include <net/ethernet.h> 42#include <net/if.h> 43#include <net/if_llc.h> 44#include <net/if_media.h> 45#include <net/if_vlan_var.h> 46 47#include <net80211/ieee80211_var.h> 48 49#ifdef INET 50#include <netinet/in.h> 51#include <netinet/if_ether.h> 52#include <netinet/in_systm.h> 53#include <netinet/ip.h> 54#endif 55 56#ifdef IEEE80211_DEBUG 57/* 58 * Decide if an outbound management frame should be 59 * printed when debugging is enabled. This filters some 60 * of the less interesting frames that come frequently 61 * (e.g. beacons). 62 */ 63static __inline int 64doprint(struct ieee80211com *ic, int subtype) 65{ 66 switch (subtype) { 67 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 68 return (ic->ic_opmode == IEEE80211_M_IBSS); 69 } 70 return 1; 71} 72#endif 73 74/* 75 * Set the direction field and address fields of an outgoing 76 * non-QoS frame. Note this should be called early on in 77 * constructing a frame as it sets i_fc[1]; other bits can 78 * then be or'd in. 79 */ 80static void 81ieee80211_send_setup(struct ieee80211com *ic, 82 struct ieee80211_node *ni, 83 struct ieee80211_frame *wh, 84 int type, 85 const u_int8_t sa[IEEE80211_ADDR_LEN], 86 const u_int8_t da[IEEE80211_ADDR_LEN], 87 const u_int8_t bssid[IEEE80211_ADDR_LEN]) 88{ 89#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 90 91 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 92 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 93 switch (ic->ic_opmode) { 94 case IEEE80211_M_STA: 95 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 96 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 97 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 98 IEEE80211_ADDR_COPY(wh->i_addr3, da); 99 break; 100 case IEEE80211_M_IBSS: 101 case IEEE80211_M_AHDEMO: 102 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 103 IEEE80211_ADDR_COPY(wh->i_addr1, da); 104 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 105 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 106 break; 107 case IEEE80211_M_HOSTAP: 108 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 109 IEEE80211_ADDR_COPY(wh->i_addr1, da); 110 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 111 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 112 break; 113 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 114 break; 115 } 116 } else { 117 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 118 IEEE80211_ADDR_COPY(wh->i_addr1, da); 119 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 120 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 121 } 122 *(u_int16_t *)&wh->i_dur[0] = 0; 123 /* NB: use non-QoS tid */ 124 *(u_int16_t *)&wh->i_seq[0] = 125 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 126 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 127#undef WH4 128} 129 130/* 131 * Send a management frame to the specified node. The node pointer 132 * must have a reference as the pointer will be passed to the driver 133 * and potentially held for a long time. If the frame is successfully 134 * dispatched to the driver, then it is responsible for freeing the 135 * reference (and potentially free'ing up any associated storage). 136 */ 137static int 138ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 139 struct mbuf *m, int type, int timer) 140{ 141 struct ifnet *ifp = ic->ic_ifp; 142 struct ieee80211_frame *wh; 143 144 KASSERT(ni != NULL, ("null node")); 145 146 /* 147 * Yech, hack alert! We want to pass the node down to the 148 * driver's start routine. If we don't do so then the start 149 * routine must immediately look it up again and that can 150 * cause a lock order reversal if, for example, this frame 151 * is being sent because the station is being timedout and 152 * the frame being sent is a DEAUTH message. We could stick 153 * this in an m_tag and tack that on to the mbuf. However 154 * that's rather expensive to do for every frame so instead 155 * we stuff it in the rcvif field since outbound frames do 156 * not (presently) use this. 157 */ 158 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 159 if (m == NULL) 160 return ENOMEM; 161 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 162 m->m_pkthdr.rcvif = (void *)ni; 163 164 wh = mtod(m, struct ieee80211_frame *); 165 ieee80211_send_setup(ic, ni, wh, 166 IEEE80211_FC0_TYPE_MGT | type, 167 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 168 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 169 m->m_flags &= ~M_LINK0; 170 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 171 "[%s] encrypting frame (%s)\n", 172 ether_sprintf(wh->i_addr1), __func__); 173 wh->i_fc[1] |= IEEE80211_FC1_WEP; 174 } 175#ifdef IEEE80211_DEBUG 176 /* avoid printing too many frames */ 177 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 178 ieee80211_msg_dumppkts(ic)) { 179 printf("[%s] send %s on channel %u\n", 180 ether_sprintf(wh->i_addr1), 181 ieee80211_mgt_subtype_name[ 182 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 183 IEEE80211_FC0_SUBTYPE_SHIFT], 184 ieee80211_chan2ieee(ic, ic->ic_curchan)); 185 } 186#endif 187 IEEE80211_NODE_STAT(ni, tx_mgmt); 188 IF_ENQUEUE(&ic->ic_mgtq, m); 189 if (timer) { 190 /* 191 * Set the mgt frame timeout. 192 */ 193 ic->ic_mgt_timer = timer; 194 ifp->if_timer = 1; 195 } 196 if_start(ifp); 197 return 0; 198} 199 200/* 201 * Raw packet transmit stub for legacy drivers. 202 * Send the packet through the mgt q so we bypass 203 * the normal encapsulation work. 204 */ 205int 206ieee80211_raw_xmit(struct ieee80211_node *ni, struct mbuf *m, 207 const struct ieee80211_bpf_params *params) 208{ 209 struct ieee80211com *ic = ni->ni_ic; 210 struct ifnet *ifp = ic->ic_ifp; 211 212 m->m_pkthdr.rcvif = (void *) ni; 213 IF_ENQUEUE(&ic->ic_mgtq, m); 214 if_start(ifp); 215 ifp->if_opackets++; 216 217 return 0; 218} 219 220/* 221 * 802.11 output routine. This is (currently) used only to 222 * connect bpf write calls to the 802.11 layer for injecting 223 * raw 802.11 frames. Note we locate the ieee80211com from 224 * the ifnet using a spare field setup at attach time. This 225 * will go away when the virtual ap support comes in. 226 */ 227int 228ieee80211_output(struct ifnet *ifp, struct mbuf *m, 229 struct sockaddr *dst, struct rtentry *rt0) 230{ 231#define senderr(e) do { error = (e); goto bad;} while (0) 232 struct ieee80211com *ic = ifp->if_spare2; /* XXX */ 233 struct ieee80211_node *ni = NULL; 234 struct ieee80211_frame *wh; 235 int error; 236 237 /* 238 * Hand to the 802.3 code if not tagged as 239 * a raw 802.11 frame. 240 */ 241 if (dst->sa_family != AF_IEEE80211) 242 return ether_output(ifp, m, dst, rt0); 243#ifdef MAC 244 error = mac_check_ifnet_transmit(ifp, m); 245 if (error) 246 senderr(error); 247#endif 248 if (ifp->if_flags & IFF_MONITOR) 249 senderr(ENETDOWN); 250 if ((ifp->if_flags & IFF_UP) == 0) 251 senderr(ENETDOWN); 252 253 /* XXX bypass bridge, pfil, carp, etc. */ 254 255 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 256 senderr(EIO); /* XXX */ 257 wh = mtod(m, struct ieee80211_frame *); 258 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 259 IEEE80211_FC0_VERSION_0) 260 senderr(EIO); /* XXX */ 261 262 /* locate destination node */ 263 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 264 case IEEE80211_FC1_DIR_NODS: 265 case IEEE80211_FC1_DIR_FROMDS: 266 ni = ieee80211_find_txnode(ic, wh->i_addr1); 267 break; 268 case IEEE80211_FC1_DIR_TODS: 269 case IEEE80211_FC1_DIR_DSTODS: 270 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 271 senderr(EIO); /* XXX */ 272 ni = ieee80211_find_txnode(ic, wh->i_addr3); 273 break; 274 default: 275 senderr(EIO); /* XXX */ 276 } 277 if (ni == NULL) { 278 /* 279 * Permit packets w/ bpf params through regardless 280 * (see below about sa_len). 281 */ 282 if (dst->sa_len == 0) 283 senderr(EHOSTUNREACH); 284 ni = ieee80211_ref_node(ic->ic_bss); 285 } 286 287 /* XXX ctrl frames should go through */ 288 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 289 (m->m_flags & M_PWR_SAV) == 0) { 290 /* 291 * Station in power save mode; pass the frame 292 * to the 802.11 layer and continue. We'll get 293 * the frame back when the time is right. 294 */ 295 ieee80211_pwrsave(ic, ni, m); 296 error = 0; 297 goto reclaim; 298 } 299 300 /* calculate priority so drivers can find the tx queue */ 301 /* XXX assumes an 802.3 frame */ 302 if (ieee80211_classify(ic, m, ni)) 303 senderr(EIO); /* XXX */ 304 305 BPF_MTAP(ifp, m); 306 /* 307 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 308 * present by setting the sa_len field of the sockaddr (yes, 309 * this is a hack). 310 * NB: we assume sa_data is suitably aligned to cast. 311 */ 312 return ic->ic_raw_xmit(ni, m, (const struct ieee80211_bpf_params *) 313 (dst->sa_len ? dst->sa_data : NULL)); 314bad: 315 if (m != NULL) 316 m_freem(m); 317reclaim: 318 if (ni != NULL) 319 ieee80211_free_node(ni); 320 return error; 321#undef senderr 322} 323 324/* 325 * Send a null data frame to the specified node. 326 * 327 * NB: the caller is assumed to have setup a node reference 328 * for use; this is necessary to deal with a race condition 329 * when probing for inactive stations. 330 */ 331int 332ieee80211_send_nulldata(struct ieee80211_node *ni) 333{ 334 struct ieee80211com *ic = ni->ni_ic; 335 struct ifnet *ifp = ic->ic_ifp; 336 struct mbuf *m; 337 struct ieee80211_frame *wh; 338 339 MGETHDR(m, M_NOWAIT, MT_DATA); 340 if (m == NULL) { 341 /* XXX debug msg */ 342 ic->ic_stats.is_tx_nobuf++; 343 ieee80211_unref_node(&ni); 344 return ENOMEM; 345 } 346 m->m_pkthdr.rcvif = (void *) ni; 347 348 wh = mtod(m, struct ieee80211_frame *); 349 ieee80211_send_setup(ic, ni, wh, 350 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 351 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 352 /* NB: power management bit is never sent by an AP */ 353 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 354 ic->ic_opmode != IEEE80211_M_HOSTAP) 355 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 356 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 357 358 IEEE80211_NODE_STAT(ni, tx_data); 359 360 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 361 "[%s] send null data frame on channel %u, pwr mgt %s\n", 362 ether_sprintf(ni->ni_macaddr), 363 ieee80211_chan2ieee(ic, ic->ic_curchan), 364 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 365 366 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 367 if_start(ifp); 368 369 return 0; 370} 371 372/* 373 * Assign priority to a frame based on any vlan tag assigned 374 * to the station and/or any Diffserv setting in an IP header. 375 * Finally, if an ACM policy is setup (in station mode) it's 376 * applied. 377 */ 378int 379ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 380{ 381 int v_wme_ac, d_wme_ac, ac; 382#ifdef INET 383 struct ether_header *eh; 384#endif 385 386 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 387 ac = WME_AC_BE; 388 goto done; 389 } 390 391 /* 392 * If node has a vlan tag then all traffic 393 * to it must have a matching tag. 394 */ 395 v_wme_ac = 0; 396 if (ni->ni_vlan != 0) { 397 if ((m->m_flags & M_VLANTAG) == 0) { 398 IEEE80211_NODE_STAT(ni, tx_novlantag); 399 return 1; 400 } 401 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 402 EVL_VLANOFTAG(ni->ni_vlan)) { 403 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 404 return 1; 405 } 406 /* map vlan priority to AC */ 407 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 408 case 1: 409 case 2: 410 v_wme_ac = WME_AC_BK; 411 break; 412 case 0: 413 case 3: 414 v_wme_ac = WME_AC_BE; 415 break; 416 case 4: 417 case 5: 418 v_wme_ac = WME_AC_VI; 419 break; 420 case 6: 421 case 7: 422 v_wme_ac = WME_AC_VO; 423 break; 424 } 425 } 426 427#ifdef INET 428 eh = mtod(m, struct ether_header *); 429 if (eh->ether_type == htons(ETHERTYPE_IP)) { 430 const struct ip *ip = (struct ip *) 431 (mtod(m, u_int8_t *) + sizeof (*eh)); 432 /* 433 * IP frame, map the TOS field. 434 */ 435 switch (ip->ip_tos) { 436 case 0x08: 437 case 0x20: 438 d_wme_ac = WME_AC_BK; /* background */ 439 break; 440 case 0x28: 441 case 0xa0: 442 d_wme_ac = WME_AC_VI; /* video */ 443 break; 444 case 0x30: /* voice */ 445 case 0xe0: 446 case 0x88: /* XXX UPSD */ 447 case 0xb8: 448 d_wme_ac = WME_AC_VO; 449 break; 450 default: 451 d_wme_ac = WME_AC_BE; 452 break; 453 } 454 } else { 455#endif /* INET */ 456 d_wme_ac = WME_AC_BE; 457#ifdef INET 458 } 459#endif 460 /* 461 * Use highest priority AC. 462 */ 463 if (v_wme_ac > d_wme_ac) 464 ac = v_wme_ac; 465 else 466 ac = d_wme_ac; 467 468 /* 469 * Apply ACM policy. 470 */ 471 if (ic->ic_opmode == IEEE80211_M_STA) { 472 static const int acmap[4] = { 473 WME_AC_BK, /* WME_AC_BE */ 474 WME_AC_BK, /* WME_AC_BK */ 475 WME_AC_BE, /* WME_AC_VI */ 476 WME_AC_VI, /* WME_AC_VO */ 477 }; 478 while (ac != WME_AC_BK && 479 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 480 ac = acmap[ac]; 481 } 482done: 483 M_WME_SETAC(m, ac); 484 return 0; 485} 486 487/* 488 * Insure there is sufficient contiguous space to encapsulate the 489 * 802.11 data frame. If room isn't already there, arrange for it. 490 * Drivers and cipher modules assume we have done the necessary work 491 * and fail rudely if they don't find the space they need. 492 */ 493static struct mbuf * 494ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 495 struct ieee80211_key *key, struct mbuf *m) 496{ 497#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 498 int needed_space = hdrsize; 499 500 if (key != NULL) { 501 /* XXX belongs in crypto code? */ 502 needed_space += key->wk_cipher->ic_header; 503 /* XXX frags */ 504 /* 505 * When crypto is being done in the host we must insure 506 * the data are writable for the cipher routines; clone 507 * a writable mbuf chain. 508 * XXX handle SWMIC specially 509 */ 510 if (key->wk_flags & (IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC)) { 511 m = m_unshare(m, M_NOWAIT); 512 if (m == NULL) { 513 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 514 "%s: cannot get writable mbuf\n", __func__); 515 ic->ic_stats.is_tx_nobuf++; /* XXX new stat */ 516 return NULL; 517 } 518 } 519 } 520 /* 521 * We know we are called just before stripping an Ethernet 522 * header and prepending an LLC header. This means we know 523 * there will be 524 * sizeof(struct ether_header) - sizeof(struct llc) 525 * bytes recovered to which we need additional space for the 526 * 802.11 header and any crypto header. 527 */ 528 /* XXX check trailing space and copy instead? */ 529 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 530 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 531 if (n == NULL) { 532 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 533 "%s: cannot expand storage\n", __func__); 534 ic->ic_stats.is_tx_nobuf++; 535 m_freem(m); 536 return NULL; 537 } 538 KASSERT(needed_space <= MHLEN, 539 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 540 /* 541 * Setup new mbuf to have leading space to prepend the 542 * 802.11 header and any crypto header bits that are 543 * required (the latter are added when the driver calls 544 * back to ieee80211_crypto_encap to do crypto encapsulation). 545 */ 546 /* NB: must be first 'cuz it clobbers m_data */ 547 m_move_pkthdr(n, m); 548 n->m_len = 0; /* NB: m_gethdr does not set */ 549 n->m_data += needed_space; 550 /* 551 * Pull up Ethernet header to create the expected layout. 552 * We could use m_pullup but that's overkill (i.e. we don't 553 * need the actual data) and it cannot fail so do it inline 554 * for speed. 555 */ 556 /* NB: struct ether_header is known to be contiguous */ 557 n->m_len += sizeof(struct ether_header); 558 m->m_len -= sizeof(struct ether_header); 559 m->m_data += sizeof(struct ether_header); 560 /* 561 * Replace the head of the chain. 562 */ 563 n->m_next = m; 564 m = n; 565 } 566 return m; 567#undef TO_BE_RECLAIMED 568} 569 570/* 571 * Return the transmit key to use in sending a unicast frame. 572 * If a unicast key is set we use that. When no unicast key is set 573 * we fall back to the default transmit key. 574 */ 575static __inline struct ieee80211_key * 576ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 577{ 578 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 579 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 580 IEEE80211_KEY_UNDEFINED(&ic->ic_nw_keys[ic->ic_def_txkey])) 581 return NULL; 582 return &ic->ic_nw_keys[ic->ic_def_txkey]; 583 } else { 584 return &ni->ni_ucastkey; 585 } 586} 587 588/* 589 * Return the transmit key to use in sending a multicast frame. 590 * Multicast traffic always uses the group key which is installed as 591 * the default tx key. 592 */ 593static __inline struct ieee80211_key * 594ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 595{ 596 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 597 IEEE80211_KEY_UNDEFINED(&ic->ic_nw_keys[ic->ic_def_txkey])) 598 return NULL; 599 return &ic->ic_nw_keys[ic->ic_def_txkey]; 600} 601 602/* 603 * Encapsulate an outbound data frame. The mbuf chain is updated. 604 * If an error is encountered NULL is returned. The caller is required 605 * to provide a node reference and pullup the ethernet header in the 606 * first mbuf. 607 */ 608struct mbuf * 609ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 610 struct ieee80211_node *ni) 611{ 612 struct ether_header eh; 613 struct ieee80211_frame *wh; 614 struct ieee80211_key *key; 615 struct llc *llc; 616 int hdrsize, datalen, addqos; 617 618 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 619 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 620 621 /* 622 * Insure space for additional headers. First identify 623 * transmit key to use in calculating any buffer adjustments 624 * required. This is also used below to do privacy 625 * encapsulation work. Then calculate the 802.11 header 626 * size and any padding required by the driver. 627 * 628 * Note key may be NULL if we fall back to the default 629 * transmit key and that is not set. In that case the 630 * buffer may not be expanded as needed by the cipher 631 * routines, but they will/should discard it. 632 */ 633 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 634 if (ic->ic_opmode == IEEE80211_M_STA || 635 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 636 key = ieee80211_crypto_getucastkey(ic, ni); 637 else 638 key = ieee80211_crypto_getmcastkey(ic, ni); 639 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 640 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 641 "[%s] no default transmit key (%s) deftxkey %u\n", 642 ether_sprintf(eh.ether_dhost), __func__, 643 ic->ic_def_txkey); 644 ic->ic_stats.is_tx_nodefkey++; 645 } 646 } else 647 key = NULL; 648 /* XXX 4-address format */ 649 /* 650 * XXX Some ap's don't handle QoS-encapsulated EAPOL 651 * frames so suppress use. This may be an issue if other 652 * ap's require all data frames to be QoS-encapsulated 653 * once negotiated in which case we'll need to make this 654 * configurable. 655 */ 656 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 657 eh.ether_type != htons(ETHERTYPE_PAE); 658 if (addqos) 659 hdrsize = sizeof(struct ieee80211_qosframe); 660 else 661 hdrsize = sizeof(struct ieee80211_frame); 662 if (ic->ic_flags & IEEE80211_F_DATAPAD) 663 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 664 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 665 if (m == NULL) { 666 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 667 goto bad; 668 } 669 670 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 671 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 672 llc = mtod(m, struct llc *); 673 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 674 llc->llc_control = LLC_UI; 675 llc->llc_snap.org_code[0] = 0; 676 llc->llc_snap.org_code[1] = 0; 677 llc->llc_snap.org_code[2] = 0; 678 llc->llc_snap.ether_type = eh.ether_type; 679 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 680 681 M_PREPEND(m, hdrsize, M_DONTWAIT); 682 if (m == NULL) { 683 ic->ic_stats.is_tx_nobuf++; 684 goto bad; 685 } 686 wh = mtod(m, struct ieee80211_frame *); 687 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 688 *(u_int16_t *)wh->i_dur = 0; 689 switch (ic->ic_opmode) { 690 case IEEE80211_M_STA: 691 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 692 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 693 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 694 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 695 break; 696 case IEEE80211_M_IBSS: 697 case IEEE80211_M_AHDEMO: 698 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 699 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 700 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 701 /* 702 * NB: always use the bssid from ic_bss as the 703 * neighbor's may be stale after an ibss merge 704 */ 705 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 706 break; 707 case IEEE80211_M_HOSTAP: 708 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 709 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 710 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 711 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 712 break; 713 case IEEE80211_M_MONITOR: 714 goto bad; 715 } 716 if (m->m_flags & M_MORE_DATA) 717 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 718 if (addqos) { 719 struct ieee80211_qosframe *qwh = 720 (struct ieee80211_qosframe *) wh; 721 int ac, tid; 722 723 ac = M_WME_GETAC(m); 724 /* map from access class/queue to 11e header priorty value */ 725 tid = WME_AC_TO_TID(ac); 726 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 727 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 728 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 729 qwh->i_qos[1] = 0; 730 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 731 732 *(u_int16_t *)wh->i_seq = 733 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 734 ni->ni_txseqs[tid]++; 735 } else { 736 *(u_int16_t *)wh->i_seq = 737 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 738 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 739 } 740 if (key != NULL) { 741 /* 742 * IEEE 802.1X: send EAPOL frames always in the clear. 743 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 744 */ 745 if (eh.ether_type != htons(ETHERTYPE_PAE) || 746 ((ic->ic_flags & IEEE80211_F_WPA) && 747 (ic->ic_opmode == IEEE80211_M_STA ? 748 !IEEE80211_KEY_UNDEFINED(key) : 749 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 750 wh->i_fc[1] |= IEEE80211_FC1_WEP; 751 /* XXX do fragmentation */ 752 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 753 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 754 "[%s] enmic failed, discard frame\n", 755 ether_sprintf(eh.ether_dhost)); 756 ic->ic_stats.is_crypto_enmicfail++; 757 goto bad; 758 } 759 } 760 } 761 762 IEEE80211_NODE_STAT(ni, tx_data); 763 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 764 IEEE80211_NODE_STAT(ni, tx_mcast); 765 else 766 IEEE80211_NODE_STAT(ni, tx_ucast); 767 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 768 769 return m; 770bad: 771 if (m != NULL) 772 m_freem(m); 773 return NULL; 774} 775 776/* 777 * Add a supported rates element id to a frame. 778 */ 779static u_int8_t * 780ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 781{ 782 int nrates; 783 784 *frm++ = IEEE80211_ELEMID_RATES; 785 nrates = rs->rs_nrates; 786 if (nrates > IEEE80211_RATE_SIZE) 787 nrates = IEEE80211_RATE_SIZE; 788 *frm++ = nrates; 789 memcpy(frm, rs->rs_rates, nrates); 790 return frm + nrates; 791} 792 793/* 794 * Add an extended supported rates element id to a frame. 795 */ 796static u_int8_t * 797ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 798{ 799 /* 800 * Add an extended supported rates element if operating in 11g mode. 801 */ 802 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 803 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 804 *frm++ = IEEE80211_ELEMID_XRATES; 805 *frm++ = nrates; 806 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 807 frm += nrates; 808 } 809 return frm; 810} 811 812/* 813 * Add an ssid elemet to a frame. 814 */ 815static u_int8_t * 816ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 817{ 818 *frm++ = IEEE80211_ELEMID_SSID; 819 *frm++ = len; 820 memcpy(frm, ssid, len); 821 return frm + len; 822} 823 824/* 825 * Add an erp element to a frame. 826 */ 827static u_int8_t * 828ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 829{ 830 u_int8_t erp; 831 832 *frm++ = IEEE80211_ELEMID_ERP; 833 *frm++ = 1; 834 erp = 0; 835 if (ic->ic_nonerpsta != 0) 836 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 837 if (ic->ic_flags & IEEE80211_F_USEPROT) 838 erp |= IEEE80211_ERP_USE_PROTECTION; 839 if (ic->ic_flags & IEEE80211_F_USEBARKER) 840 erp |= IEEE80211_ERP_LONG_PREAMBLE; 841 *frm++ = erp; 842 return frm; 843} 844 845static u_int8_t * 846ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 847{ 848#define WPA_OUI_BYTES 0x00, 0x50, 0xf2 849#define ADDSHORT(frm, v) do { \ 850 frm[0] = (v) & 0xff; \ 851 frm[1] = (v) >> 8; \ 852 frm += 2; \ 853} while (0) 854#define ADDSELECTOR(frm, sel) do { \ 855 memcpy(frm, sel, 4); \ 856 frm += 4; \ 857} while (0) 858 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 859 static const u_int8_t cipher_suite[][4] = { 860 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 861 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 862 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 863 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 864 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 865 { WPA_OUI_BYTES, WPA_CSE_NULL }, 866 }; 867 static const u_int8_t wep104_suite[4] = 868 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 869 static const u_int8_t key_mgt_unspec[4] = 870 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 871 static const u_int8_t key_mgt_psk[4] = 872 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 873 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 874 u_int8_t *frm = ie; 875 u_int8_t *selcnt; 876 877 *frm++ = IEEE80211_ELEMID_VENDOR; 878 *frm++ = 0; /* length filled in below */ 879 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 880 frm += sizeof(oui); 881 ADDSHORT(frm, WPA_VERSION); 882 883 /* XXX filter out CKIP */ 884 885 /* multicast cipher */ 886 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 887 rsn->rsn_mcastkeylen >= 13) 888 ADDSELECTOR(frm, wep104_suite); 889 else 890 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 891 892 /* unicast cipher list */ 893 selcnt = frm; 894 ADDSHORT(frm, 0); /* selector count */ 895 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 896 selcnt[0]++; 897 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 898 } 899 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 900 selcnt[0]++; 901 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 902 } 903 904 /* authenticator selector list */ 905 selcnt = frm; 906 ADDSHORT(frm, 0); /* selector count */ 907 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 908 selcnt[0]++; 909 ADDSELECTOR(frm, key_mgt_unspec); 910 } 911 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 912 selcnt[0]++; 913 ADDSELECTOR(frm, key_mgt_psk); 914 } 915 916 /* optional capabilities */ 917 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 918 ADDSHORT(frm, rsn->rsn_caps); 919 920 /* calculate element length */ 921 ie[1] = frm - ie - 2; 922 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 923 ("WPA IE too big, %u > %zu", 924 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 925 return frm; 926#undef ADDSHORT 927#undef ADDSELECTOR 928#undef WPA_OUI_BYTES 929} 930 931static u_int8_t * 932ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 933{ 934#define RSN_OUI_BYTES 0x00, 0x0f, 0xac 935#define ADDSHORT(frm, v) do { \ 936 frm[0] = (v) & 0xff; \ 937 frm[1] = (v) >> 8; \ 938 frm += 2; \ 939} while (0) 940#define ADDSELECTOR(frm, sel) do { \ 941 memcpy(frm, sel, 4); \ 942 frm += 4; \ 943} while (0) 944 static const u_int8_t cipher_suite[][4] = { 945 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 946 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 947 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 948 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 949 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 950 { RSN_OUI_BYTES, RSN_CSE_NULL }, 951 }; 952 static const u_int8_t wep104_suite[4] = 953 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 954 static const u_int8_t key_mgt_unspec[4] = 955 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 956 static const u_int8_t key_mgt_psk[4] = 957 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 958 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 959 u_int8_t *frm = ie; 960 u_int8_t *selcnt; 961 962 *frm++ = IEEE80211_ELEMID_RSN; 963 *frm++ = 0; /* length filled in below */ 964 ADDSHORT(frm, RSN_VERSION); 965 966 /* XXX filter out CKIP */ 967 968 /* multicast cipher */ 969 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 970 rsn->rsn_mcastkeylen >= 13) 971 ADDSELECTOR(frm, wep104_suite); 972 else 973 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 974 975 /* unicast cipher list */ 976 selcnt = frm; 977 ADDSHORT(frm, 0); /* selector count */ 978 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 979 selcnt[0]++; 980 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 981 } 982 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 983 selcnt[0]++; 984 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 985 } 986 987 /* authenticator selector list */ 988 selcnt = frm; 989 ADDSHORT(frm, 0); /* selector count */ 990 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 991 selcnt[0]++; 992 ADDSELECTOR(frm, key_mgt_unspec); 993 } 994 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 995 selcnt[0]++; 996 ADDSELECTOR(frm, key_mgt_psk); 997 } 998 999 /* optional capabilities */ 1000 ADDSHORT(frm, rsn->rsn_caps); 1001 /* XXX PMKID */ 1002 1003 /* calculate element length */ 1004 ie[1] = frm - ie - 2; 1005 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1006 ("RSN IE too big, %u > %zu", 1007 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1008 return frm; 1009#undef ADDSELECTOR 1010#undef ADDSHORT 1011#undef RSN_OUI_BYTES 1012} 1013 1014/* 1015 * Add a WPA/RSN element to a frame. 1016 */ 1017static u_int8_t * 1018ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 1019{ 1020 1021 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 1022 if (ic->ic_flags & IEEE80211_F_WPA2) 1023 frm = ieee80211_setup_rsn_ie(ic, frm); 1024 if (ic->ic_flags & IEEE80211_F_WPA1) 1025 frm = ieee80211_setup_wpa_ie(ic, frm); 1026 return frm; 1027} 1028 1029#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1030/* 1031 * Add a WME information element to a frame. 1032 */ 1033static u_int8_t * 1034ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 1035{ 1036 static const struct ieee80211_wme_info info = { 1037 .wme_id = IEEE80211_ELEMID_VENDOR, 1038 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1039 .wme_oui = { WME_OUI_BYTES }, 1040 .wme_type = WME_OUI_TYPE, 1041 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1042 .wme_version = WME_VERSION, 1043 .wme_info = 0, 1044 }; 1045 memcpy(frm, &info, sizeof(info)); 1046 return frm + sizeof(info); 1047} 1048 1049/* 1050 * Add a WME parameters element to a frame. 1051 */ 1052static u_int8_t * 1053ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 1054{ 1055#define SM(_v, _f) (((_v) << _f##_S) & _f) 1056#define ADDSHORT(frm, v) do { \ 1057 frm[0] = (v) & 0xff; \ 1058 frm[1] = (v) >> 8; \ 1059 frm += 2; \ 1060} while (0) 1061 /* NB: this works 'cuz a param has an info at the front */ 1062 static const struct ieee80211_wme_info param = { 1063 .wme_id = IEEE80211_ELEMID_VENDOR, 1064 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1065 .wme_oui = { WME_OUI_BYTES }, 1066 .wme_type = WME_OUI_TYPE, 1067 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1068 .wme_version = WME_VERSION, 1069 }; 1070 int i; 1071 1072 memcpy(frm, ¶m, sizeof(param)); 1073 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1074 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1075 *frm++ = 0; /* reserved field */ 1076 for (i = 0; i < WME_NUM_AC; i++) { 1077 const struct wmeParams *ac = 1078 &wme->wme_bssChanParams.cap_wmeParams[i]; 1079 *frm++ = SM(i, WME_PARAM_ACI) 1080 | SM(ac->wmep_acm, WME_PARAM_ACM) 1081 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1082 ; 1083 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1084 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1085 ; 1086 ADDSHORT(frm, ac->wmep_txopLimit); 1087 } 1088 return frm; 1089#undef SM 1090#undef ADDSHORT 1091} 1092#undef WME_OUI_BYTES 1093 1094/* 1095 * Send a probe request frame with the specified ssid 1096 * and any optional information element data. 1097 */ 1098int 1099ieee80211_send_probereq(struct ieee80211_node *ni, 1100 const u_int8_t sa[IEEE80211_ADDR_LEN], 1101 const u_int8_t da[IEEE80211_ADDR_LEN], 1102 const u_int8_t bssid[IEEE80211_ADDR_LEN], 1103 const u_int8_t *ssid, size_t ssidlen, 1104 const void *optie, size_t optielen) 1105{ 1106 struct ieee80211com *ic = ni->ni_ic; 1107 struct ieee80211_frame *wh; 1108 const struct ieee80211_rateset *rs; 1109 struct mbuf *m; 1110 u_int8_t *frm; 1111 1112 /* 1113 * Hold a reference on the node so it doesn't go away until after 1114 * the xmit is complete all the way in the driver. On error we 1115 * will remove our reference. 1116 */ 1117 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1118 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1119 __func__, __LINE__, 1120 ni, ether_sprintf(ni->ni_macaddr), 1121 ieee80211_node_refcnt(ni)+1); 1122 ieee80211_ref_node(ni); 1123 1124 /* 1125 * prreq frame format 1126 * [tlv] ssid 1127 * [tlv] supported rates 1128 * [tlv] extended supported rates 1129 * [tlv] user-specified ie's 1130 */ 1131 m = ieee80211_getmgtframe(&frm, 1132 2 + IEEE80211_NWID_LEN 1133 + 2 + IEEE80211_RATE_SIZE 1134 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1135 + (optie != NULL ? optielen : 0) 1136 ); 1137 if (m == NULL) { 1138 ic->ic_stats.is_tx_nobuf++; 1139 ieee80211_free_node(ni); 1140 return ENOMEM; 1141 } 1142 1143 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1144 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1145 frm = ieee80211_add_rates(frm, rs); 1146 frm = ieee80211_add_xrates(frm, rs); 1147 1148 if (optie != NULL) { 1149 memcpy(frm, optie, optielen); 1150 frm += optielen; 1151 } 1152 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1153 1154 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1155 if (m == NULL) 1156 return ENOMEM; 1157 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1158 m->m_pkthdr.rcvif = (void *)ni; 1159 1160 wh = mtod(m, struct ieee80211_frame *); 1161 ieee80211_send_setup(ic, ni, wh, 1162 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1163 sa, da, bssid); 1164 /* XXX power management? */ 1165 1166 IEEE80211_NODE_STAT(ni, tx_probereq); 1167 IEEE80211_NODE_STAT(ni, tx_mgmt); 1168 1169 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1170 "[%s] send probe req on channel %u\n", 1171 ether_sprintf(wh->i_addr1), 1172 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1173 1174 IF_ENQUEUE(&ic->ic_mgtq, m); 1175 if_start(ic->ic_ifp); 1176 return 0; 1177} 1178 1179/* 1180 * Calculate capability information for mgt frames. 1181 */ 1182static u_int16_t 1183getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan) 1184{ 1185 u_int16_t capinfo; 1186 1187 KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode")); 1188 1189 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1190 capinfo = IEEE80211_CAPINFO_ESS; 1191 else if (ic->ic_opmode == IEEE80211_M_IBSS) 1192 capinfo = IEEE80211_CAPINFO_IBSS; 1193 else 1194 capinfo = 0; 1195 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1196 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1197 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1198 IEEE80211_IS_CHAN_2GHZ(chan)) 1199 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1200 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1201 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1202 return capinfo; 1203} 1204 1205/* 1206 * Send a management frame. The node is for the destination (or ic_bss 1207 * when in station mode). Nodes other than ic_bss have their reference 1208 * count bumped to reflect our use for an indeterminant time. 1209 */ 1210int 1211ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1212 int type, int arg) 1213{ 1214#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1215 struct mbuf *m; 1216 u_int8_t *frm; 1217 u_int16_t capinfo; 1218 int has_challenge, is_shared_key, ret, timer, status; 1219 1220 KASSERT(ni != NULL, ("null node")); 1221 1222 /* 1223 * Hold a reference on the node so it doesn't go away until after 1224 * the xmit is complete all the way in the driver. On error we 1225 * will remove our reference. 1226 */ 1227 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1228 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1229 __func__, __LINE__, 1230 ni, ether_sprintf(ni->ni_macaddr), 1231 ieee80211_node_refcnt(ni)+1); 1232 ieee80211_ref_node(ni); 1233 1234 timer = 0; 1235 switch (type) { 1236 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1237 /* 1238 * probe response frame format 1239 * [8] time stamp 1240 * [2] beacon interval 1241 * [2] cabability information 1242 * [tlv] ssid 1243 * [tlv] supported rates 1244 * [tlv] parameter set (FH/DS) 1245 * [tlv] parameter set (IBSS) 1246 * [tlv] extended rate phy (ERP) 1247 * [tlv] extended supported rates 1248 * [tlv] WPA 1249 * [tlv] WME (optional) 1250 */ 1251 m = ieee80211_getmgtframe(&frm, 1252 8 1253 + sizeof(u_int16_t) 1254 + sizeof(u_int16_t) 1255 + 2 + IEEE80211_NWID_LEN 1256 + 2 + IEEE80211_RATE_SIZE 1257 + 7 /* max(7,3) */ 1258 + 6 1259 + 3 1260 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1261 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1262 + (ic->ic_flags & IEEE80211_F_WPA ? 1263 2*sizeof(struct ieee80211_ie_wpa) : 0) 1264 + sizeof(struct ieee80211_wme_param) 1265 ); 1266 if (m == NULL) 1267 senderr(ENOMEM, is_tx_nobuf); 1268 1269 memset(frm, 0, 8); /* timestamp should be filled later */ 1270 frm += 8; 1271 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1272 frm += 2; 1273 capinfo = getcapinfo(ic, ic->ic_curchan); 1274 *(u_int16_t *)frm = htole16(capinfo); 1275 frm += 2; 1276 1277 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1278 ic->ic_bss->ni_esslen); 1279 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1280 1281 if (ic->ic_phytype == IEEE80211_T_FH) { 1282 *frm++ = IEEE80211_ELEMID_FHPARMS; 1283 *frm++ = 5; 1284 *frm++ = ni->ni_fhdwell & 0x00ff; 1285 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1286 *frm++ = IEEE80211_FH_CHANSET( 1287 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1288 *frm++ = IEEE80211_FH_CHANPAT( 1289 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1290 *frm++ = ni->ni_fhindex; 1291 } else { 1292 *frm++ = IEEE80211_ELEMID_DSPARMS; 1293 *frm++ = 1; 1294 *frm++ = ieee80211_chan2ieee(ic, ic->ic_curchan); 1295 } 1296 1297 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1298 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1299 *frm++ = 2; 1300 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1301 } 1302 if (ic->ic_flags & IEEE80211_F_WPA) 1303 frm = ieee80211_add_wpa(frm, ic); 1304 if (ic->ic_curmode == IEEE80211_MODE_11G) 1305 frm = ieee80211_add_erp(frm, ic); 1306 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1307 if (ic->ic_flags & IEEE80211_F_WME) 1308 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1309 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1310 break; 1311 1312 case IEEE80211_FC0_SUBTYPE_AUTH: 1313 status = arg >> 16; 1314 arg &= 0xffff; 1315 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1316 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1317 ni->ni_challenge != NULL); 1318 1319 /* 1320 * Deduce whether we're doing open authentication or 1321 * shared key authentication. We do the latter if 1322 * we're in the middle of a shared key authentication 1323 * handshake or if we're initiating an authentication 1324 * request and configured to use shared key. 1325 */ 1326 is_shared_key = has_challenge || 1327 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1328 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1329 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1330 1331 m = ieee80211_getmgtframe(&frm, 1332 3 * sizeof(u_int16_t) 1333 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1334 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1335 ); 1336 if (m == NULL) 1337 senderr(ENOMEM, is_tx_nobuf); 1338 1339 ((u_int16_t *)frm)[0] = 1340 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1341 : htole16(IEEE80211_AUTH_ALG_OPEN); 1342 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1343 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1344 1345 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1346 ((u_int16_t *)frm)[3] = 1347 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1348 IEEE80211_ELEMID_CHALLENGE); 1349 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1350 IEEE80211_CHALLENGE_LEN); 1351 m->m_pkthdr.len = m->m_len = 1352 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1353 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1354 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1355 "[%s] request encrypt frame (%s)\n", 1356 ether_sprintf(ni->ni_macaddr), __func__); 1357 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1358 } 1359 } else 1360 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1361 1362 /* XXX not right for shared key */ 1363 if (status == IEEE80211_STATUS_SUCCESS) 1364 IEEE80211_NODE_STAT(ni, tx_auth); 1365 else 1366 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1367 1368 if (ic->ic_opmode == IEEE80211_M_STA) 1369 timer = IEEE80211_TRANS_WAIT; 1370 break; 1371 1372 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1373 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1374 "[%s] send station deauthenticate (reason %d)\n", 1375 ether_sprintf(ni->ni_macaddr), arg); 1376 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1377 if (m == NULL) 1378 senderr(ENOMEM, is_tx_nobuf); 1379 *(u_int16_t *)frm = htole16(arg); /* reason */ 1380 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1381 1382 IEEE80211_NODE_STAT(ni, tx_deauth); 1383 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1384 1385 ieee80211_node_unauthorize(ni); /* port closed */ 1386 break; 1387 1388 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1389 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1390 /* 1391 * asreq frame format 1392 * [2] capability information 1393 * [2] listen interval 1394 * [6*] current AP address (reassoc only) 1395 * [tlv] ssid 1396 * [tlv] supported rates 1397 * [tlv] extended supported rates 1398 * [tlv] WME 1399 * [tlv] user-specified ie's 1400 */ 1401 m = ieee80211_getmgtframe(&frm, 1402 sizeof(u_int16_t) 1403 + sizeof(u_int16_t) 1404 + IEEE80211_ADDR_LEN 1405 + 2 + IEEE80211_NWID_LEN 1406 + 2 + IEEE80211_RATE_SIZE 1407 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1408 + sizeof(struct ieee80211_wme_info) 1409 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1410 ); 1411 if (m == NULL) 1412 senderr(ENOMEM, is_tx_nobuf); 1413 1414 KASSERT(ic->ic_opmode == IEEE80211_M_STA, 1415 ("wrong mode %u", ic->ic_opmode)); 1416 capinfo = IEEE80211_CAPINFO_ESS; 1417 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1418 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1419 /* 1420 * NB: Some 11a AP's reject the request when 1421 * short premable is set. 1422 */ 1423 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1424 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1425 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1426 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1427 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1428 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1429 *(u_int16_t *)frm = htole16(capinfo); 1430 frm += 2; 1431 1432 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1433 frm += 2; 1434 1435 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1436 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1437 frm += IEEE80211_ADDR_LEN; 1438 } 1439 1440 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1441 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1442 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1443 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1444 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1445 if (ic->ic_opt_ie != NULL) { 1446 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1447 frm += ic->ic_opt_ie_len; 1448 } 1449 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1450 1451 timer = IEEE80211_TRANS_WAIT; 1452 break; 1453 1454 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1455 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1456 /* 1457 * asreq frame format 1458 * [2] capability information 1459 * [2] status 1460 * [2] association ID 1461 * [tlv] supported rates 1462 * [tlv] extended supported rates 1463 * [tlv] WME (if enabled and STA enabled) 1464 */ 1465 m = ieee80211_getmgtframe(&frm, 1466 sizeof(u_int16_t) 1467 + sizeof(u_int16_t) 1468 + sizeof(u_int16_t) 1469 + 2 + IEEE80211_RATE_SIZE 1470 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1471 + sizeof(struct ieee80211_wme_param) 1472 ); 1473 if (m == NULL) 1474 senderr(ENOMEM, is_tx_nobuf); 1475 1476 capinfo = getcapinfo(ic, ic->ic_curchan); 1477 *(u_int16_t *)frm = htole16(capinfo); 1478 frm += 2; 1479 1480 *(u_int16_t *)frm = htole16(arg); /* status */ 1481 frm += 2; 1482 1483 if (arg == IEEE80211_STATUS_SUCCESS) { 1484 *(u_int16_t *)frm = htole16(ni->ni_associd); 1485 IEEE80211_NODE_STAT(ni, tx_assoc); 1486 } else 1487 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1488 frm += 2; 1489 1490 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1491 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1492 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1493 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1494 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1495 break; 1496 1497 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1498 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1499 "[%s] send station disassociate (reason %d)\n", 1500 ether_sprintf(ni->ni_macaddr), arg); 1501 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1502 if (m == NULL) 1503 senderr(ENOMEM, is_tx_nobuf); 1504 *(u_int16_t *)frm = htole16(arg); /* reason */ 1505 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1506 1507 IEEE80211_NODE_STAT(ni, tx_disassoc); 1508 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1509 break; 1510 1511 default: 1512 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1513 "[%s] invalid mgmt frame type %u\n", 1514 ether_sprintf(ni->ni_macaddr), type); 1515 senderr(EINVAL, is_tx_unknownmgt); 1516 /* NOTREACHED */ 1517 } 1518 ret = ieee80211_mgmt_output(ic, ni, m, type, timer); 1519 if (ret != 0) { 1520bad: 1521 ieee80211_free_node(ni); 1522 } 1523 return ret; 1524#undef senderr 1525} 1526 1527/* 1528 * Allocate a beacon frame and fillin the appropriate bits. 1529 */ 1530struct mbuf * 1531ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1532 struct ieee80211_beacon_offsets *bo) 1533{ 1534 struct ifnet *ifp = ic->ic_ifp; 1535 struct ieee80211_frame *wh; 1536 struct mbuf *m; 1537 int pktlen; 1538 u_int8_t *frm, *efrm; 1539 u_int16_t capinfo; 1540 struct ieee80211_rateset *rs; 1541 1542 /* 1543 * beacon frame format 1544 * [8] time stamp 1545 * [2] beacon interval 1546 * [2] cabability information 1547 * [tlv] ssid 1548 * [tlv] supported rates 1549 * [3] parameter set (DS) 1550 * [tlv] parameter set (IBSS/TIM) 1551 * [tlv] extended rate phy (ERP) 1552 * [tlv] extended supported rates 1553 * [tlv] WME parameters 1554 * [tlv] WPA/RSN parameters 1555 * XXX Vendor-specific OIDs (e.g. Atheros) 1556 * NB: we allocate the max space required for the TIM bitmap. 1557 */ 1558 rs = &ni->ni_rates; 1559 pktlen = 8 /* time stamp */ 1560 + sizeof(u_int16_t) /* beacon interval */ 1561 + sizeof(u_int16_t) /* capabilities */ 1562 + 2 + ni->ni_esslen /* ssid */ 1563 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1564 + 2 + 1 /* DS parameters */ 1565 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1566 + 2 + 1 /* ERP */ 1567 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1568 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1569 sizeof(struct ieee80211_wme_param) : 0) 1570 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1571 2*sizeof(struct ieee80211_ie_wpa) : 0) 1572 ; 1573 m = ieee80211_getmgtframe(&frm, pktlen); 1574 if (m == NULL) { 1575 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1576 "%s: cannot get buf; size %u\n", __func__, pktlen); 1577 ic->ic_stats.is_tx_nobuf++; 1578 return NULL; 1579 } 1580 1581 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1582 frm += 8; 1583 *(u_int16_t *)frm = htole16(ni->ni_intval); 1584 frm += 2; 1585 capinfo = getcapinfo(ic, ni->ni_chan); 1586 bo->bo_caps = (u_int16_t *)frm; 1587 *(u_int16_t *)frm = htole16(capinfo); 1588 frm += 2; 1589 *frm++ = IEEE80211_ELEMID_SSID; 1590 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1591 *frm++ = ni->ni_esslen; 1592 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1593 frm += ni->ni_esslen; 1594 } else 1595 *frm++ = 0; 1596 frm = ieee80211_add_rates(frm, rs); 1597 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1598 *frm++ = IEEE80211_ELEMID_DSPARMS; 1599 *frm++ = 1; 1600 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1601 } 1602 bo->bo_tim = frm; 1603 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1604 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1605 *frm++ = 2; 1606 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1607 bo->bo_tim_len = 0; 1608 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1609 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1610 1611 tie->tim_ie = IEEE80211_ELEMID_TIM; 1612 tie->tim_len = 4; /* length */ 1613 tie->tim_count = 0; /* DTIM count */ 1614 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1615 tie->tim_bitctl = 0; /* bitmap control */ 1616 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1617 frm += sizeof(struct ieee80211_tim_ie); 1618 bo->bo_tim_len = 1; 1619 } 1620 bo->bo_trailer = frm; 1621 if (ic->ic_flags & IEEE80211_F_WME) { 1622 bo->bo_wme = frm; 1623 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1624 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1625 } 1626 if (ic->ic_flags & IEEE80211_F_WPA) 1627 frm = ieee80211_add_wpa(frm, ic); 1628 if (ic->ic_curmode == IEEE80211_MODE_11G) { 1629 bo->bo_erp = frm; 1630 frm = ieee80211_add_erp(frm, ic); 1631 } 1632 efrm = ieee80211_add_xrates(frm, rs); 1633 bo->bo_trailer_len = efrm - bo->bo_trailer; 1634 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1635 1636 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1637 KASSERT(m != NULL, ("no space for 802.11 header?")); 1638 wh = mtod(m, struct ieee80211_frame *); 1639 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1640 IEEE80211_FC0_SUBTYPE_BEACON; 1641 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1642 *(u_int16_t *)wh->i_dur = 0; 1643 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1644 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1645 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1646 *(u_int16_t *)wh->i_seq = 0; 1647 1648 return m; 1649} 1650 1651/* 1652 * Update the dynamic parts of a beacon frame based on the current state. 1653 */ 1654int 1655ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1656 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1657{ 1658 int len_changed = 0; 1659 u_int16_t capinfo; 1660 1661 IEEE80211_BEACON_LOCK(ic); 1662 /* XXX faster to recalculate entirely or just changes? */ 1663 capinfo = getcapinfo(ic, ni->ni_chan); 1664 *bo->bo_caps = htole16(capinfo); 1665 1666 if (ic->ic_flags & IEEE80211_F_WME) { 1667 struct ieee80211_wme_state *wme = &ic->ic_wme; 1668 1669 /* 1670 * Check for agressive mode change. When there is 1671 * significant high priority traffic in the BSS 1672 * throttle back BE traffic by using conservative 1673 * parameters. Otherwise BE uses agressive params 1674 * to optimize performance of legacy/non-QoS traffic. 1675 */ 1676 if (wme->wme_flags & WME_F_AGGRMODE) { 1677 if (wme->wme_hipri_traffic > 1678 wme->wme_hipri_switch_thresh) { 1679 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1680 "%s: traffic %u, disable aggressive mode\n", 1681 __func__, wme->wme_hipri_traffic); 1682 wme->wme_flags &= ~WME_F_AGGRMODE; 1683 ieee80211_wme_updateparams_locked(ic); 1684 wme->wme_hipri_traffic = 1685 wme->wme_hipri_switch_hysteresis; 1686 } else 1687 wme->wme_hipri_traffic = 0; 1688 } else { 1689 if (wme->wme_hipri_traffic <= 1690 wme->wme_hipri_switch_thresh) { 1691 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1692 "%s: traffic %u, enable aggressive mode\n", 1693 __func__, wme->wme_hipri_traffic); 1694 wme->wme_flags |= WME_F_AGGRMODE; 1695 ieee80211_wme_updateparams_locked(ic); 1696 wme->wme_hipri_traffic = 0; 1697 } else 1698 wme->wme_hipri_traffic = 1699 wme->wme_hipri_switch_hysteresis; 1700 } 1701 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1702 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1703 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1704 } 1705 } 1706 1707 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1708 struct ieee80211_tim_ie *tie = 1709 (struct ieee80211_tim_ie *) bo->bo_tim; 1710 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1711 u_int timlen, timoff, i; 1712 /* 1713 * ATIM/DTIM needs updating. If it fits in the 1714 * current space allocated then just copy in the 1715 * new bits. Otherwise we need to move any trailing 1716 * data to make room. Note that we know there is 1717 * contiguous space because ieee80211_beacon_allocate 1718 * insures there is space in the mbuf to write a 1719 * maximal-size virtual bitmap (based on ic_max_aid). 1720 */ 1721 /* 1722 * Calculate the bitmap size and offset, copy any 1723 * trailer out of the way, and then copy in the 1724 * new bitmap and update the information element. 1725 * Note that the tim bitmap must contain at least 1726 * one byte and any offset must be even. 1727 */ 1728 if (ic->ic_ps_pending != 0) { 1729 timoff = 128; /* impossibly large */ 1730 for (i = 0; i < ic->ic_tim_len; i++) 1731 if (ic->ic_tim_bitmap[i]) { 1732 timoff = i &~ 1; 1733 break; 1734 } 1735 KASSERT(timoff != 128, ("tim bitmap empty!")); 1736 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1737 if (ic->ic_tim_bitmap[i]) 1738 break; 1739 timlen = 1 + (i - timoff); 1740 } else { 1741 timoff = 0; 1742 timlen = 1; 1743 } 1744 if (timlen != bo->bo_tim_len) { 1745 /* copy up/down trailer */ 1746 int adjust = tie->tim_bitmap+timlen 1747 - bo->bo_trailer; 1748 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust, 1749 bo->bo_trailer_len); 1750 bo->bo_trailer += adjust; 1751 bo->bo_wme += adjust; 1752 bo->bo_erp += adjust; 1753 bo->bo_tim_len = timlen; 1754 1755 /* update information element */ 1756 tie->tim_len = 3 + timlen; 1757 tie->tim_bitctl = timoff; 1758 len_changed = 1; 1759 } 1760 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1761 bo->bo_tim_len); 1762 1763 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1764 1765 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1766 "%s: TIM updated, pending %u, off %u, len %u\n", 1767 __func__, ic->ic_ps_pending, timoff, timlen); 1768 } 1769 /* count down DTIM period */ 1770 if (tie->tim_count == 0) 1771 tie->tim_count = tie->tim_period - 1; 1772 else 1773 tie->tim_count--; 1774 /* update state for buffered multicast frames on DTIM */ 1775 if (mcast && tie->tim_count == 0) 1776 tie->tim_bitctl |= 1; 1777 else 1778 tie->tim_bitctl &= ~1; 1779 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) { 1780 /* 1781 * ERP element needs updating. 1782 */ 1783 (void) ieee80211_add_erp(bo->bo_erp, ic); 1784 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE; 1785 } 1786 } 1787 IEEE80211_BEACON_UNLOCK(ic); 1788 1789 return len_changed; 1790} 1791 1792/* 1793 * Save an outbound packet for a node in power-save sleep state. 1794 * The new packet is placed on the node's saved queue, and the TIM 1795 * is changed, if necessary. 1796 */ 1797void 1798ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1799 struct mbuf *m) 1800{ 1801 int qlen, age; 1802 1803 IEEE80211_NODE_SAVEQ_LOCK(ni); 1804 if (_IF_QFULL(&ni->ni_savedq)) { 1805 _IF_DROP(&ni->ni_savedq); 1806 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1807 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1808 "[%s] pwr save q overflow, drops %d (size %d)\n", 1809 ether_sprintf(ni->ni_macaddr), 1810 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1811#ifdef IEEE80211_DEBUG 1812 if (ieee80211_msg_dumppkts(ic)) 1813 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1814#endif 1815 m_freem(m); 1816 return; 1817 } 1818 /* 1819 * Tag the frame with it's expiry time and insert 1820 * it in the queue. The aging interval is 4 times 1821 * the listen interval specified by the station. 1822 * Frames that sit around too long are reclaimed 1823 * using this information. 1824 */ 1825 /* XXX handle overflow? */ 1826 age = ((ni->ni_intval * ic->ic_bintval) << 2) / 1024; /* TU -> secs */ 1827 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1828 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1829 1830 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1831 "[%s] save frame with age %d, %u now queued\n", 1832 ether_sprintf(ni->ni_macaddr), age, qlen); 1833 1834 if (qlen == 1) 1835 ic->ic_set_tim(ni, 1); 1836} 1837