ieee80211_output.c revision 193439
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 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 193439 2009-06-04 15:57:38Z sam $"); 29 30#include "opt_inet.h" 31#include "opt_wlan.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/mbuf.h> 36#include <sys/kernel.h> 37#include <sys/endian.h> 38 39#include <sys/socket.h> 40 41#include <net/bpf.h> 42#include <net/ethernet.h> 43#include <net/if.h> 44#include <net/if_llc.h> 45#include <net/if_media.h> 46#include <net/if_vlan_var.h> 47 48#include <net80211/ieee80211_var.h> 49#include <net80211/ieee80211_regdomain.h> 50#ifdef IEEE80211_SUPPORT_SUPERG 51#include <net80211/ieee80211_superg.h> 52#endif 53#ifdef IEEE80211_SUPPORT_TDMA 54#include <net80211/ieee80211_tdma.h> 55#endif 56#include <net80211/ieee80211_wds.h> 57 58#ifdef INET 59#include <netinet/in.h> 60#include <netinet/if_ether.h> 61#include <netinet/in_systm.h> 62#include <netinet/ip.h> 63#endif 64 65#define ETHER_HEADER_COPY(dst, src) \ 66 memcpy(dst, src, sizeof(struct ether_header)) 67 68static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 69 u_int hdrsize, u_int ciphdrsize, u_int mtu); 70static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 71 72#ifdef IEEE80211_DEBUG 73/* 74 * Decide if an outbound management frame should be 75 * printed when debugging is enabled. This filters some 76 * of the less interesting frames that come frequently 77 * (e.g. beacons). 78 */ 79static __inline int 80doprint(struct ieee80211vap *vap, int subtype) 81{ 82 switch (subtype) { 83 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 84 return (vap->iv_opmode == IEEE80211_M_IBSS); 85 } 86 return 1; 87} 88#endif 89 90/* 91 * Start method for vap's. All packets from the stack come 92 * through here. We handle common processing of the packets 93 * before dispatching them to the underlying device. 94 */ 95void 96ieee80211_start(struct ifnet *ifp) 97{ 98#define IS_DWDS(vap) \ 99 (vap->iv_opmode == IEEE80211_M_WDS && \ 100 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 101 struct ieee80211vap *vap = ifp->if_softc; 102 struct ieee80211com *ic = vap->iv_ic; 103 struct ifnet *parent = ic->ic_ifp; 104 struct ieee80211_node *ni; 105 struct mbuf *m; 106 struct ether_header *eh; 107 int error; 108 109 /* NB: parent must be up and running */ 110 if (!IFNET_IS_UP_RUNNING(parent)) { 111 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 112 "%s: ignore queue, parent %s not up+running\n", 113 __func__, parent->if_xname); 114 /* XXX stat */ 115 return; 116 } 117 if (vap->iv_state == IEEE80211_S_SLEEP) { 118 /* 119 * In power save, wakeup device for transmit. 120 */ 121 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 122 return; 123 } 124 /* 125 * No data frames go out unless we're running. 126 * Note in particular this covers CAC and CSA 127 * states (though maybe we should check muting 128 * for CSA). 129 */ 130 if (vap->iv_state != IEEE80211_S_RUN) { 131 IEEE80211_LOCK(ic); 132 /* re-check under the com lock to avoid races */ 133 if (vap->iv_state != IEEE80211_S_RUN) { 134 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 135 "%s: ignore queue, in %s state\n", 136 __func__, ieee80211_state_name[vap->iv_state]); 137 vap->iv_stats.is_tx_badstate++; 138 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 139 IEEE80211_UNLOCK(ic); 140 return; 141 } 142 IEEE80211_UNLOCK(ic); 143 } 144 for (;;) { 145 IFQ_DEQUEUE(&ifp->if_snd, m); 146 if (m == NULL) 147 break; 148 /* 149 * Sanitize mbuf flags for net80211 use. We cannot 150 * clear M_PWR_SAV because this may be set for frames 151 * that are re-submitted from the power save queue. 152 * 153 * NB: This must be done before ieee80211_classify as 154 * it marks EAPOL in frames with M_EAPOL. 155 */ 156 m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 157 /* 158 * Cancel any background scan. 159 */ 160 if (ic->ic_flags & IEEE80211_F_SCAN) 161 ieee80211_cancel_anyscan(vap); 162 /* 163 * Find the node for the destination so we can do 164 * things like power save and fast frames aggregation. 165 * 166 * NB: past this point various code assumes the first 167 * mbuf has the 802.3 header present (and contiguous). 168 */ 169 ni = NULL; 170 if (m->m_len < sizeof(struct ether_header) && 171 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 172 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 173 "discard frame, %s\n", "m_pullup failed"); 174 vap->iv_stats.is_tx_nobuf++; /* XXX */ 175 ifp->if_oerrors++; 176 continue; 177 } 178 eh = mtod(m, struct ether_header *); 179 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 180 if (IS_DWDS(vap)) { 181 /* 182 * Only unicast frames from the above go out 183 * DWDS vaps; multicast frames are handled by 184 * dispatching the frame as it comes through 185 * the AP vap (see below). 186 */ 187 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 188 eh->ether_dhost, "mcast", "%s", "on DWDS"); 189 vap->iv_stats.is_dwds_mcast++; 190 m_freem(m); 191 continue; 192 } 193 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 194 /* 195 * Spam DWDS vap's w/ multicast traffic. 196 */ 197 /* XXX only if dwds in use? */ 198 ieee80211_dwds_mcast(vap, m); 199 } 200 } 201 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 202 if (ni == NULL) { 203 /* NB: ieee80211_find_txnode does stat+msg */ 204 ifp->if_oerrors++; 205 m_freem(m); 206 continue; 207 } 208 if (ni->ni_associd == 0 && 209 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 211 eh->ether_dhost, NULL, 212 "sta not associated (type 0x%04x)", 213 htons(eh->ether_type)); 214 vap->iv_stats.is_tx_notassoc++; 215 ifp->if_oerrors++; 216 m_freem(m); 217 ieee80211_free_node(ni); 218 continue; 219 } 220 221 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 222 (m->m_flags & M_PWR_SAV) == 0) { 223 /* 224 * Station in power save mode; pass the frame 225 * to the 802.11 layer and continue. We'll get 226 * the frame back when the time is right. 227 * XXX lose WDS vap linkage? 228 */ 229 (void) ieee80211_pwrsave(ni, m); 230 ieee80211_free_node(ni); 231 continue; 232 } 233 /* calculate priority so drivers can find the tx queue */ 234 if (ieee80211_classify(ni, m)) { 235 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 236 eh->ether_dhost, NULL, 237 "%s", "classification failure"); 238 vap->iv_stats.is_tx_classify++; 239 ifp->if_oerrors++; 240 m_freem(m); 241 ieee80211_free_node(ni); 242 continue; 243 } 244 /* 245 * Stash the node pointer. Note that we do this after 246 * any call to ieee80211_dwds_mcast because that code 247 * uses any existing value for rcvif to identify the 248 * interface it (might have been) received on. 249 */ 250 m->m_pkthdr.rcvif = (void *)ni; 251 252 BPF_MTAP(ifp, m); /* 802.3 tx */ 253 254 /* 255 * Check if A-MPDU tx aggregation is setup or if we 256 * should try to enable it. The sta must be associated 257 * with HT and A-MPDU enabled for use. When the policy 258 * routine decides we should enable A-MPDU we issue an 259 * ADDBA request and wait for a reply. The frame being 260 * encapsulated will go out w/o using A-MPDU, or possibly 261 * it might be collected by the driver and held/retransmit. 262 * The default ic_ampdu_enable routine handles staggering 263 * ADDBA requests in case the receiver NAK's us or we are 264 * otherwise unable to establish a BA stream. 265 */ 266 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 267 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX) && 268 (m->m_flags & M_EAPOL) == 0) { 269 const int ac = M_WME_GETAC(m); 270 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 271 272 ieee80211_txampdu_count_packet(tap); 273 if (IEEE80211_AMPDU_RUNNING(tap)) { 274 /* 275 * Operational, mark frame for aggregation. 276 * 277 * XXX do tx aggregation here 278 */ 279 m->m_flags |= M_AMPDU_MPDU; 280 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 281 ic->ic_ampdu_enable(ni, tap)) { 282 /* 283 * Not negotiated yet, request service. 284 */ 285 ieee80211_ampdu_request(ni, tap); 286 /* XXX hold frame for reply? */ 287 } 288 } 289#ifdef IEEE80211_SUPPORT_SUPERG 290 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 291 m = ieee80211_ff_check(ni, m); 292 if (m == NULL) { 293 /* NB: any ni ref held on stageq */ 294 continue; 295 } 296 } 297#endif /* IEEE80211_SUPPORT_SUPERG */ 298 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 299 /* 300 * Encapsulate the packet in prep for transmission. 301 */ 302 m = ieee80211_encap(vap, ni, m); 303 if (m == NULL) { 304 /* NB: stat+msg handled in ieee80211_encap */ 305 ieee80211_free_node(ni); 306 continue; 307 } 308 } 309 310 error = parent->if_transmit(parent, m); 311 if (error != 0) { 312 /* NB: IFQ_HANDOFF reclaims mbuf */ 313 ieee80211_free_node(ni); 314 } else { 315 ifp->if_opackets++; 316 } 317 ic->ic_lastdata = ticks; 318 } 319#undef IS_DWDS 320} 321 322/* 323 * 802.11 output routine. This is (currently) used only to 324 * connect bpf write calls to the 802.11 layer for injecting 325 * raw 802.11 frames. 326 */ 327int 328ieee80211_output(struct ifnet *ifp, struct mbuf *m, 329 struct sockaddr *dst, struct route *ro) 330{ 331#define senderr(e) do { error = (e); goto bad;} while (0) 332 struct ieee80211_node *ni = NULL; 333 struct ieee80211vap *vap; 334 struct ieee80211_frame *wh; 335 int error; 336 337 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 338 /* 339 * Short-circuit requests if the vap is marked OACTIVE 340 * as this is used when tearing down state to indicate 341 * the vap may be gone. This can also happen because a 342 * packet came down through ieee80211_start before the 343 * vap entered RUN state in which case it's also ok to 344 * just drop the frame. This should not be necessary 345 * but callers of if_output don't check OACTIVE. 346 */ 347 senderr(ENETDOWN); 348 } 349 vap = ifp->if_softc; 350 /* 351 * Hand to the 802.3 code if not tagged as 352 * a raw 802.11 frame. 353 */ 354 if (dst->sa_family != AF_IEEE80211) 355 return vap->iv_output(ifp, m, dst, ro); 356#ifdef MAC 357 error = mac_check_ifnet_transmit(ifp, m); 358 if (error) 359 senderr(error); 360#endif 361 if (ifp->if_flags & IFF_MONITOR) 362 senderr(ENETDOWN); 363 if (!IFNET_IS_UP_RUNNING(ifp)) 364 senderr(ENETDOWN); 365 if (vap->iv_state == IEEE80211_S_CAC) { 366 IEEE80211_DPRINTF(vap, 367 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 368 "block %s frame in CAC state\n", "raw data"); 369 vap->iv_stats.is_tx_badstate++; 370 senderr(EIO); /* XXX */ 371 } 372 /* XXX bypass bridge, pfil, carp, etc. */ 373 374 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 375 senderr(EIO); /* XXX */ 376 wh = mtod(m, struct ieee80211_frame *); 377 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 378 IEEE80211_FC0_VERSION_0) 379 senderr(EIO); /* XXX */ 380 381 /* locate destination node */ 382 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 383 case IEEE80211_FC1_DIR_NODS: 384 case IEEE80211_FC1_DIR_FROMDS: 385 ni = ieee80211_find_txnode(vap, wh->i_addr1); 386 break; 387 case IEEE80211_FC1_DIR_TODS: 388 case IEEE80211_FC1_DIR_DSTODS: 389 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 390 senderr(EIO); /* XXX */ 391 ni = ieee80211_find_txnode(vap, wh->i_addr3); 392 break; 393 default: 394 senderr(EIO); /* XXX */ 395 } 396 if (ni == NULL) { 397 /* 398 * Permit packets w/ bpf params through regardless 399 * (see below about sa_len). 400 */ 401 if (dst->sa_len == 0) 402 senderr(EHOSTUNREACH); 403 ni = ieee80211_ref_node(vap->iv_bss); 404 } 405 406 /* 407 * Sanitize mbuf for net80211 flags leaked from above. 408 * 409 * NB: This must be done before ieee80211_classify as 410 * it marks EAPOL in frames with M_EAPOL. 411 */ 412 m->m_flags &= ~M_80211_TX; 413 414 /* calculate priority so drivers can find the tx queue */ 415 /* XXX assumes an 802.3 frame */ 416 if (ieee80211_classify(ni, m)) 417 senderr(EIO); /* XXX */ 418 419 IEEE80211_NODE_STAT(ni, tx_data); 420 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 421 IEEE80211_NODE_STAT(ni, tx_mcast); 422 m->m_flags |= M_MCAST; 423 } else 424 IEEE80211_NODE_STAT(ni, tx_ucast); 425 /* NB: ieee80211_encap does not include 802.11 header */ 426 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 427 428 /* 429 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 430 * present by setting the sa_len field of the sockaddr (yes, 431 * this is a hack). 432 * NB: we assume sa_data is suitably aligned to cast. 433 */ 434 return vap->iv_ic->ic_raw_xmit(ni, m, 435 (const struct ieee80211_bpf_params *)(dst->sa_len ? 436 dst->sa_data : NULL)); 437bad: 438 if (m != NULL) 439 m_freem(m); 440 if (ni != NULL) 441 ieee80211_free_node(ni); 442 return error; 443#undef senderr 444} 445 446/* 447 * Set the direction field and address fields of an outgoing 448 * frame. Note this should be called early on in constructing 449 * a frame as it sets i_fc[1]; other bits can then be or'd in. 450 */ 451static void 452ieee80211_send_setup( 453 struct ieee80211_node *ni, 454 struct mbuf *m, 455 int type, int tid, 456 const uint8_t sa[IEEE80211_ADDR_LEN], 457 const uint8_t da[IEEE80211_ADDR_LEN], 458 const uint8_t bssid[IEEE80211_ADDR_LEN]) 459{ 460#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 461 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 462 ieee80211_seq seqno; 463 464 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 465 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 466 struct ieee80211vap *vap = ni->ni_vap; 467 468 switch (vap->iv_opmode) { 469 case IEEE80211_M_STA: 470 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 471 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 472 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 473 IEEE80211_ADDR_COPY(wh->i_addr3, da); 474 break; 475 case IEEE80211_M_IBSS: 476 case IEEE80211_M_AHDEMO: 477 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 478 IEEE80211_ADDR_COPY(wh->i_addr1, da); 479 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 480 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 481 break; 482 case IEEE80211_M_HOSTAP: 483 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 484 IEEE80211_ADDR_COPY(wh->i_addr1, da); 485 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 486 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 487 break; 488 case IEEE80211_M_WDS: 489 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 490 IEEE80211_ADDR_COPY(wh->i_addr1, da); 491 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 492 IEEE80211_ADDR_COPY(wh->i_addr3, da); 493 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 494 break; 495 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 496 break; 497 } 498 } else { 499 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 500 IEEE80211_ADDR_COPY(wh->i_addr1, da); 501 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 502 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 503 } 504 *(uint16_t *)&wh->i_dur[0] = 0; 505 506 seqno = ni->ni_txseqs[tid]++; 507 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 508 M_SEQNO_SET(m, seqno); 509 510 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 511 m->m_flags |= M_MCAST; 512#undef WH4 513} 514 515/* 516 * Send a management frame to the specified node. The node pointer 517 * must have a reference as the pointer will be passed to the driver 518 * and potentially held for a long time. If the frame is successfully 519 * dispatched to the driver, then it is responsible for freeing the 520 * reference (and potentially free'ing up any associated storage); 521 * otherwise deal with reclaiming any reference (on error). 522 */ 523int 524ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 525 struct ieee80211_bpf_params *params) 526{ 527 struct ieee80211vap *vap = ni->ni_vap; 528 struct ieee80211com *ic = ni->ni_ic; 529 struct ieee80211_frame *wh; 530 531 KASSERT(ni != NULL, ("null node")); 532 533 if (vap->iv_state == IEEE80211_S_CAC) { 534 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 535 ni, "block %s frame in CAC state", 536 ieee80211_mgt_subtype_name[ 537 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 538 IEEE80211_FC0_SUBTYPE_SHIFT]); 539 vap->iv_stats.is_tx_badstate++; 540 ieee80211_free_node(ni); 541 m_freem(m); 542 return EIO; /* XXX */ 543 } 544 545 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 546 if (m == NULL) { 547 ieee80211_free_node(ni); 548 return ENOMEM; 549 } 550 551 wh = mtod(m, struct ieee80211_frame *); 552 ieee80211_send_setup(ni, m, 553 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 554 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 555 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 556 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 557 "encrypting frame (%s)", __func__); 558 wh->i_fc[1] |= IEEE80211_FC1_WEP; 559 } 560 m->m_flags |= M_ENCAP; /* mark encapsulated */ 561 562 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 563 M_WME_SETAC(m, params->ibp_pri); 564 565#ifdef IEEE80211_DEBUG 566 /* avoid printing too many frames */ 567 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 568 ieee80211_msg_dumppkts(vap)) { 569 printf("[%s] send %s on channel %u\n", 570 ether_sprintf(wh->i_addr1), 571 ieee80211_mgt_subtype_name[ 572 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 573 IEEE80211_FC0_SUBTYPE_SHIFT], 574 ieee80211_chan2ieee(ic, ic->ic_curchan)); 575 } 576#endif 577 IEEE80211_NODE_STAT(ni, tx_mgmt); 578 579 return ic->ic_raw_xmit(ni, m, params); 580} 581 582/* 583 * Send a null data frame to the specified node. If the station 584 * is setup for QoS then a QoS Null Data frame is constructed. 585 * If this is a WDS station then a 4-address frame is constructed. 586 * 587 * NB: the caller is assumed to have setup a node reference 588 * for use; this is necessary to deal with a race condition 589 * when probing for inactive stations. Like ieee80211_mgmt_output 590 * we must cleanup any node reference on error; however we 591 * can safely just unref it as we know it will never be the 592 * last reference to the node. 593 */ 594int 595ieee80211_send_nulldata(struct ieee80211_node *ni) 596{ 597 struct ieee80211vap *vap = ni->ni_vap; 598 struct ieee80211com *ic = ni->ni_ic; 599 struct mbuf *m; 600 struct ieee80211_frame *wh; 601 int hdrlen; 602 uint8_t *frm; 603 604 if (vap->iv_state == IEEE80211_S_CAC) { 605 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 606 ni, "block %s frame in CAC state", "null data"); 607 ieee80211_unref_node(&ni); 608 vap->iv_stats.is_tx_badstate++; 609 return EIO; /* XXX */ 610 } 611 612 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 613 hdrlen = sizeof(struct ieee80211_qosframe); 614 else 615 hdrlen = sizeof(struct ieee80211_frame); 616 /* NB: only WDS vap's get 4-address frames */ 617 if (vap->iv_opmode == IEEE80211_M_WDS) 618 hdrlen += IEEE80211_ADDR_LEN; 619 if (ic->ic_flags & IEEE80211_F_DATAPAD) 620 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 621 622 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 623 if (m == NULL) { 624 /* XXX debug msg */ 625 ieee80211_unref_node(&ni); 626 vap->iv_stats.is_tx_nobuf++; 627 return ENOMEM; 628 } 629 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 630 ("leading space %zd", M_LEADINGSPACE(m))); 631 M_PREPEND(m, hdrlen, M_DONTWAIT); 632 if (m == NULL) { 633 /* NB: cannot happen */ 634 ieee80211_free_node(ni); 635 return ENOMEM; 636 } 637 638 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 639 if (ni->ni_flags & IEEE80211_NODE_QOS) { 640 const int tid = WME_AC_TO_TID(WME_AC_BE); 641 uint8_t *qos; 642 643 ieee80211_send_setup(ni, m, 644 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 645 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 646 647 if (vap->iv_opmode == IEEE80211_M_WDS) 648 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 649 else 650 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 651 qos[0] = tid & IEEE80211_QOS_TID; 652 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 653 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 654 qos[1] = 0; 655 } else { 656 ieee80211_send_setup(ni, m, 657 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 658 IEEE80211_NONQOS_TID, 659 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 660 } 661 if (vap->iv_opmode != IEEE80211_M_WDS) { 662 /* NB: power management bit is never sent by an AP */ 663 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 664 vap->iv_opmode != IEEE80211_M_HOSTAP) 665 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 666 } 667 m->m_len = m->m_pkthdr.len = hdrlen; 668 m->m_flags |= M_ENCAP; /* mark encapsulated */ 669 670 M_WME_SETAC(m, WME_AC_BE); 671 672 IEEE80211_NODE_STAT(ni, tx_data); 673 674 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 675 "send %snull data frame on channel %u, pwr mgt %s", 676 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 677 ieee80211_chan2ieee(ic, ic->ic_curchan), 678 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 679 680 return ic->ic_raw_xmit(ni, m, NULL); 681} 682 683/* 684 * Assign priority to a frame based on any vlan tag assigned 685 * to the station and/or any Diffserv setting in an IP header. 686 * Finally, if an ACM policy is setup (in station mode) it's 687 * applied. 688 */ 689int 690ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 691{ 692 const struct ether_header *eh = mtod(m, struct ether_header *); 693 int v_wme_ac, d_wme_ac, ac; 694 695 /* 696 * Always promote PAE/EAPOL frames to high priority. 697 */ 698 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 699 /* NB: mark so others don't need to check header */ 700 m->m_flags |= M_EAPOL; 701 ac = WME_AC_VO; 702 goto done; 703 } 704 /* 705 * Non-qos traffic goes to BE. 706 */ 707 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 708 ac = WME_AC_BE; 709 goto done; 710 } 711 712 /* 713 * If node has a vlan tag then all traffic 714 * to it must have a matching tag. 715 */ 716 v_wme_ac = 0; 717 if (ni->ni_vlan != 0) { 718 if ((m->m_flags & M_VLANTAG) == 0) { 719 IEEE80211_NODE_STAT(ni, tx_novlantag); 720 return 1; 721 } 722 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 723 EVL_VLANOFTAG(ni->ni_vlan)) { 724 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 725 return 1; 726 } 727 /* map vlan priority to AC */ 728 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 729 } 730 731#ifdef INET 732 if (eh->ether_type == htons(ETHERTYPE_IP)) { 733 uint8_t tos; 734 /* 735 * IP frame, map the DSCP bits from the TOS field. 736 */ 737 /* XXX m_copydata may be too slow for fast path */ 738 /* NB: ip header may not be in first mbuf */ 739 m_copydata(m, sizeof(struct ether_header) + 740 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 741 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 742 d_wme_ac = TID_TO_WME_AC(tos); 743 } else { 744#endif /* INET */ 745 d_wme_ac = WME_AC_BE; 746#ifdef INET 747 } 748#endif 749 /* 750 * Use highest priority AC. 751 */ 752 if (v_wme_ac > d_wme_ac) 753 ac = v_wme_ac; 754 else 755 ac = d_wme_ac; 756 757 /* 758 * Apply ACM policy. 759 */ 760 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 761 static const int acmap[4] = { 762 WME_AC_BK, /* WME_AC_BE */ 763 WME_AC_BK, /* WME_AC_BK */ 764 WME_AC_BE, /* WME_AC_VI */ 765 WME_AC_VI, /* WME_AC_VO */ 766 }; 767 struct ieee80211com *ic = ni->ni_ic; 768 769 while (ac != WME_AC_BK && 770 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 771 ac = acmap[ac]; 772 } 773done: 774 M_WME_SETAC(m, ac); 775 return 0; 776} 777 778/* 779 * Insure there is sufficient contiguous space to encapsulate the 780 * 802.11 data frame. If room isn't already there, arrange for it. 781 * Drivers and cipher modules assume we have done the necessary work 782 * and fail rudely if they don't find the space they need. 783 */ 784struct mbuf * 785ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 786 struct ieee80211_key *key, struct mbuf *m) 787{ 788#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 789 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 790 791 if (key != NULL) { 792 /* XXX belongs in crypto code? */ 793 needed_space += key->wk_cipher->ic_header; 794 /* XXX frags */ 795 /* 796 * When crypto is being done in the host we must insure 797 * the data are writable for the cipher routines; clone 798 * a writable mbuf chain. 799 * XXX handle SWMIC specially 800 */ 801 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 802 m = m_unshare(m, M_NOWAIT); 803 if (m == NULL) { 804 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 805 "%s: cannot get writable mbuf\n", __func__); 806 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 807 return NULL; 808 } 809 } 810 } 811 /* 812 * We know we are called just before stripping an Ethernet 813 * header and prepending an LLC header. This means we know 814 * there will be 815 * sizeof(struct ether_header) - sizeof(struct llc) 816 * bytes recovered to which we need additional space for the 817 * 802.11 header and any crypto header. 818 */ 819 /* XXX check trailing space and copy instead? */ 820 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 821 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 822 if (n == NULL) { 823 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 824 "%s: cannot expand storage\n", __func__); 825 vap->iv_stats.is_tx_nobuf++; 826 m_freem(m); 827 return NULL; 828 } 829 KASSERT(needed_space <= MHLEN, 830 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 831 /* 832 * Setup new mbuf to have leading space to prepend the 833 * 802.11 header and any crypto header bits that are 834 * required (the latter are added when the driver calls 835 * back to ieee80211_crypto_encap to do crypto encapsulation). 836 */ 837 /* NB: must be first 'cuz it clobbers m_data */ 838 m_move_pkthdr(n, m); 839 n->m_len = 0; /* NB: m_gethdr does not set */ 840 n->m_data += needed_space; 841 /* 842 * Pull up Ethernet header to create the expected layout. 843 * We could use m_pullup but that's overkill (i.e. we don't 844 * need the actual data) and it cannot fail so do it inline 845 * for speed. 846 */ 847 /* NB: struct ether_header is known to be contiguous */ 848 n->m_len += sizeof(struct ether_header); 849 m->m_len -= sizeof(struct ether_header); 850 m->m_data += sizeof(struct ether_header); 851 /* 852 * Replace the head of the chain. 853 */ 854 n->m_next = m; 855 m = n; 856 } 857 return m; 858#undef TO_BE_RECLAIMED 859} 860 861/* 862 * Return the transmit key to use in sending a unicast frame. 863 * If a unicast key is set we use that. When no unicast key is set 864 * we fall back to the default transmit key. 865 */ 866static __inline struct ieee80211_key * 867ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 868 struct ieee80211_node *ni) 869{ 870 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 871 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 872 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 873 return NULL; 874 return &vap->iv_nw_keys[vap->iv_def_txkey]; 875 } else { 876 return &ni->ni_ucastkey; 877 } 878} 879 880/* 881 * Return the transmit key to use in sending a multicast frame. 882 * Multicast traffic always uses the group key which is installed as 883 * the default tx key. 884 */ 885static __inline struct ieee80211_key * 886ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 887 struct ieee80211_node *ni) 888{ 889 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 890 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 891 return NULL; 892 return &vap->iv_nw_keys[vap->iv_def_txkey]; 893} 894 895/* 896 * Encapsulate an outbound data frame. The mbuf chain is updated. 897 * If an error is encountered NULL is returned. The caller is required 898 * to provide a node reference and pullup the ethernet header in the 899 * first mbuf. 900 * 901 * NB: Packet is assumed to be processed by ieee80211_classify which 902 * marked EAPOL frames w/ M_EAPOL. 903 */ 904struct mbuf * 905ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 906 struct mbuf *m) 907{ 908#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 909 struct ieee80211com *ic = ni->ni_ic; 910 struct ether_header eh; 911 struct ieee80211_frame *wh; 912 struct ieee80211_key *key; 913 struct llc *llc; 914 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 915 ieee80211_seq seqno; 916 917 /* 918 * Copy existing Ethernet header to a safe place. The 919 * rest of the code assumes it's ok to strip it when 920 * reorganizing state for the final encapsulation. 921 */ 922 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 923 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 924 925 /* 926 * Insure space for additional headers. First identify 927 * transmit key to use in calculating any buffer adjustments 928 * required. This is also used below to do privacy 929 * encapsulation work. Then calculate the 802.11 header 930 * size and any padding required by the driver. 931 * 932 * Note key may be NULL if we fall back to the default 933 * transmit key and that is not set. In that case the 934 * buffer may not be expanded as needed by the cipher 935 * routines, but they will/should discard it. 936 */ 937 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 938 if (vap->iv_opmode == IEEE80211_M_STA || 939 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 940 (vap->iv_opmode == IEEE80211_M_WDS && 941 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 942 key = ieee80211_crypto_getucastkey(vap, ni); 943 else 944 key = ieee80211_crypto_getmcastkey(vap, ni); 945 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 946 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 947 eh.ether_dhost, 948 "no default transmit key (%s) deftxkey %u", 949 __func__, vap->iv_def_txkey); 950 vap->iv_stats.is_tx_nodefkey++; 951 goto bad; 952 } 953 } else 954 key = NULL; 955 /* 956 * XXX Some ap's don't handle QoS-encapsulated EAPOL 957 * frames so suppress use. This may be an issue if other 958 * ap's require all data frames to be QoS-encapsulated 959 * once negotiated in which case we'll need to make this 960 * configurable. 961 */ 962 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 963 (m->m_flags & M_EAPOL) == 0; 964 if (addqos) 965 hdrsize = sizeof(struct ieee80211_qosframe); 966 else 967 hdrsize = sizeof(struct ieee80211_frame); 968 /* 969 * 4-address frames need to be generated for: 970 * o packets sent through a WDS vap (IEEE80211_M_WDS) 971 * o packets sent through a vap marked for relaying 972 * (e.g. a station operating with dynamic WDS) 973 */ 974 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 975 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 976 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 977 if (is4addr) 978 hdrsize += IEEE80211_ADDR_LEN; 979 /* 980 * Honor driver DATAPAD requirement. 981 */ 982 if (ic->ic_flags & IEEE80211_F_DATAPAD) 983 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 984 else 985 hdrspace = hdrsize; 986 987 if (__predict_true((m->m_flags & M_FF) == 0)) { 988 /* 989 * Normal frame. 990 */ 991 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 992 if (m == NULL) { 993 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 994 goto bad; 995 } 996 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 997 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 998 llc = mtod(m, struct llc *); 999 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1000 llc->llc_control = LLC_UI; 1001 llc->llc_snap.org_code[0] = 0; 1002 llc->llc_snap.org_code[1] = 0; 1003 llc->llc_snap.org_code[2] = 0; 1004 llc->llc_snap.ether_type = eh.ether_type; 1005 } else { 1006#ifdef IEEE80211_SUPPORT_SUPERG 1007 /* 1008 * Aggregated frame. 1009 */ 1010 m = ieee80211_ff_encap(vap, m, hdrspace, key); 1011 if (m == NULL) 1012#endif 1013 goto bad; 1014 } 1015 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1016 1017 M_PREPEND(m, hdrspace, M_DONTWAIT); 1018 if (m == NULL) { 1019 vap->iv_stats.is_tx_nobuf++; 1020 goto bad; 1021 } 1022 wh = mtod(m, struct ieee80211_frame *); 1023 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1024 *(uint16_t *)wh->i_dur = 0; 1025 if (is4addr) { 1026 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1027 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1028 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1029 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1030 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1031 } else switch (vap->iv_opmode) { 1032 case IEEE80211_M_STA: 1033 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1034 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1035 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1036 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1037 break; 1038 case IEEE80211_M_IBSS: 1039 case IEEE80211_M_AHDEMO: 1040 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1041 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1042 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1043 /* 1044 * NB: always use the bssid from iv_bss as the 1045 * neighbor's may be stale after an ibss merge 1046 */ 1047 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1048 break; 1049 case IEEE80211_M_HOSTAP: 1050 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1051 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1052 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1053 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1054 break; 1055 case IEEE80211_M_MONITOR: 1056 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1057 goto bad; 1058 } 1059 if (m->m_flags & M_MORE_DATA) 1060 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1061 if (addqos) { 1062 uint8_t *qos; 1063 int ac, tid; 1064 1065 if (is4addr) { 1066 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1067 } else 1068 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1069 ac = M_WME_GETAC(m); 1070 /* map from access class/queue to 11e header priorty value */ 1071 tid = WME_AC_TO_TID(ac); 1072 qos[0] = tid & IEEE80211_QOS_TID; 1073 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1074 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1075 qos[1] = 0; 1076 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1077 1078 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1079 /* 1080 * NB: don't assign a sequence # to potential 1081 * aggregates; we expect this happens at the 1082 * point the frame comes off any aggregation q 1083 * as otherwise we may introduce holes in the 1084 * BA sequence space and/or make window accouting 1085 * more difficult. 1086 * 1087 * XXX may want to control this with a driver 1088 * capability; this may also change when we pull 1089 * aggregation up into net80211 1090 */ 1091 seqno = ni->ni_txseqs[tid]++; 1092 *(uint16_t *)wh->i_seq = 1093 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1094 M_SEQNO_SET(m, seqno); 1095 } 1096 } else { 1097 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1098 *(uint16_t *)wh->i_seq = 1099 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1100 M_SEQNO_SET(m, seqno); 1101 } 1102 1103 /* check if xmit fragmentation is required */ 1104 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1105 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1106 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1107 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1108 if (key != NULL) { 1109 /* 1110 * IEEE 802.1X: send EAPOL frames always in the clear. 1111 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1112 */ 1113 if ((m->m_flags & M_EAPOL) == 0 || 1114 ((vap->iv_flags & IEEE80211_F_WPA) && 1115 (vap->iv_opmode == IEEE80211_M_STA ? 1116 !IEEE80211_KEY_UNDEFINED(key) : 1117 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1118 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1119 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1120 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1121 eh.ether_dhost, 1122 "%s", "enmic failed, discard frame"); 1123 vap->iv_stats.is_crypto_enmicfail++; 1124 goto bad; 1125 } 1126 } 1127 } 1128 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1129 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1130 goto bad; 1131 1132 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1133 1134 IEEE80211_NODE_STAT(ni, tx_data); 1135 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1136 IEEE80211_NODE_STAT(ni, tx_mcast); 1137 m->m_flags |= M_MCAST; 1138 } else 1139 IEEE80211_NODE_STAT(ni, tx_ucast); 1140 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1141 1142 return m; 1143bad: 1144 if (m != NULL) 1145 m_freem(m); 1146 return NULL; 1147#undef WH4 1148} 1149 1150/* 1151 * Fragment the frame according to the specified mtu. 1152 * The size of the 802.11 header (w/o padding) is provided 1153 * so we don't need to recalculate it. We create a new 1154 * mbuf for each fragment and chain it through m_nextpkt; 1155 * we might be able to optimize this by reusing the original 1156 * packet's mbufs but that is significantly more complicated. 1157 */ 1158static int 1159ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1160 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1161{ 1162 struct ieee80211_frame *wh, *whf; 1163 struct mbuf *m, *prev, *next; 1164 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1165 1166 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1167 KASSERT(m0->m_pkthdr.len > mtu, 1168 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1169 1170 wh = mtod(m0, struct ieee80211_frame *); 1171 /* NB: mark the first frag; it will be propagated below */ 1172 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1173 totalhdrsize = hdrsize + ciphdrsize; 1174 fragno = 1; 1175 off = mtu - ciphdrsize; 1176 remainder = m0->m_pkthdr.len - off; 1177 prev = m0; 1178 do { 1179 fragsize = totalhdrsize + remainder; 1180 if (fragsize > mtu) 1181 fragsize = mtu; 1182 /* XXX fragsize can be >2048! */ 1183 KASSERT(fragsize < MCLBYTES, 1184 ("fragment size %u too big!", fragsize)); 1185 if (fragsize > MHLEN) 1186 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1187 else 1188 m = m_gethdr(M_DONTWAIT, MT_DATA); 1189 if (m == NULL) 1190 goto bad; 1191 /* leave room to prepend any cipher header */ 1192 m_align(m, fragsize - ciphdrsize); 1193 1194 /* 1195 * Form the header in the fragment. Note that since 1196 * we mark the first fragment with the MORE_FRAG bit 1197 * it automatically is propagated to each fragment; we 1198 * need only clear it on the last fragment (done below). 1199 */ 1200 whf = mtod(m, struct ieee80211_frame *); 1201 memcpy(whf, wh, hdrsize); 1202 *(uint16_t *)&whf->i_seq[0] |= htole16( 1203 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1204 IEEE80211_SEQ_FRAG_SHIFT); 1205 fragno++; 1206 1207 payload = fragsize - totalhdrsize; 1208 /* NB: destination is known to be contiguous */ 1209 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1210 m->m_len = hdrsize + payload; 1211 m->m_pkthdr.len = hdrsize + payload; 1212 m->m_flags |= M_FRAG; 1213 1214 /* chain up the fragment */ 1215 prev->m_nextpkt = m; 1216 prev = m; 1217 1218 /* deduct fragment just formed */ 1219 remainder -= payload; 1220 off += payload; 1221 } while (remainder != 0); 1222 1223 /* set the last fragment */ 1224 m->m_flags |= M_LASTFRAG; 1225 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1226 1227 /* strip first mbuf now that everything has been copied */ 1228 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1229 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1230 1231 vap->iv_stats.is_tx_fragframes++; 1232 vap->iv_stats.is_tx_frags += fragno-1; 1233 1234 return 1; 1235bad: 1236 /* reclaim fragments but leave original frame for caller to free */ 1237 for (m = m0->m_nextpkt; m != NULL; m = next) { 1238 next = m->m_nextpkt; 1239 m->m_nextpkt = NULL; /* XXX paranoid */ 1240 m_freem(m); 1241 } 1242 m0->m_nextpkt = NULL; 1243 return 0; 1244} 1245 1246/* 1247 * Add a supported rates element id to a frame. 1248 */ 1249static uint8_t * 1250ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1251{ 1252 int nrates; 1253 1254 *frm++ = IEEE80211_ELEMID_RATES; 1255 nrates = rs->rs_nrates; 1256 if (nrates > IEEE80211_RATE_SIZE) 1257 nrates = IEEE80211_RATE_SIZE; 1258 *frm++ = nrates; 1259 memcpy(frm, rs->rs_rates, nrates); 1260 return frm + nrates; 1261} 1262 1263/* 1264 * Add an extended supported rates element id to a frame. 1265 */ 1266static uint8_t * 1267ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1268{ 1269 /* 1270 * Add an extended supported rates element if operating in 11g mode. 1271 */ 1272 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1273 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1274 *frm++ = IEEE80211_ELEMID_XRATES; 1275 *frm++ = nrates; 1276 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1277 frm += nrates; 1278 } 1279 return frm; 1280} 1281 1282/* 1283 * Add an ssid element to a frame. 1284 */ 1285static uint8_t * 1286ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1287{ 1288 *frm++ = IEEE80211_ELEMID_SSID; 1289 *frm++ = len; 1290 memcpy(frm, ssid, len); 1291 return frm + len; 1292} 1293 1294/* 1295 * Add an erp element to a frame. 1296 */ 1297static uint8_t * 1298ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1299{ 1300 uint8_t erp; 1301 1302 *frm++ = IEEE80211_ELEMID_ERP; 1303 *frm++ = 1; 1304 erp = 0; 1305 if (ic->ic_nonerpsta != 0) 1306 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1307 if (ic->ic_flags & IEEE80211_F_USEPROT) 1308 erp |= IEEE80211_ERP_USE_PROTECTION; 1309 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1310 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1311 *frm++ = erp; 1312 return frm; 1313} 1314 1315/* 1316 * Add a CFParams element to a frame. 1317 */ 1318static uint8_t * 1319ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1320{ 1321#define ADDSHORT(frm, v) do { \ 1322 frm[0] = (v) & 0xff; \ 1323 frm[1] = (v) >> 8; \ 1324 frm += 2; \ 1325} while (0) 1326 *frm++ = IEEE80211_ELEMID_CFPARMS; 1327 *frm++ = 6; 1328 *frm++ = 0; /* CFP count */ 1329 *frm++ = 2; /* CFP period */ 1330 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1331 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1332 return frm; 1333#undef ADDSHORT 1334} 1335 1336static __inline uint8_t * 1337add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1338{ 1339 memcpy(frm, ie->ie_data, ie->ie_len); 1340 return frm + ie->ie_len; 1341} 1342 1343static __inline uint8_t * 1344add_ie(uint8_t *frm, const uint8_t *ie) 1345{ 1346 memcpy(frm, ie, 2 + ie[1]); 1347 return frm + 2 + ie[1]; 1348} 1349 1350#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1351/* 1352 * Add a WME information element to a frame. 1353 */ 1354static uint8_t * 1355ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1356{ 1357 static const struct ieee80211_wme_info info = { 1358 .wme_id = IEEE80211_ELEMID_VENDOR, 1359 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1360 .wme_oui = { WME_OUI_BYTES }, 1361 .wme_type = WME_OUI_TYPE, 1362 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1363 .wme_version = WME_VERSION, 1364 .wme_info = 0, 1365 }; 1366 memcpy(frm, &info, sizeof(info)); 1367 return frm + sizeof(info); 1368} 1369 1370/* 1371 * Add a WME parameters element to a frame. 1372 */ 1373static uint8_t * 1374ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1375{ 1376#define SM(_v, _f) (((_v) << _f##_S) & _f) 1377#define ADDSHORT(frm, v) do { \ 1378 frm[0] = (v) & 0xff; \ 1379 frm[1] = (v) >> 8; \ 1380 frm += 2; \ 1381} while (0) 1382 /* NB: this works 'cuz a param has an info at the front */ 1383 static const struct ieee80211_wme_info param = { 1384 .wme_id = IEEE80211_ELEMID_VENDOR, 1385 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1386 .wme_oui = { WME_OUI_BYTES }, 1387 .wme_type = WME_OUI_TYPE, 1388 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1389 .wme_version = WME_VERSION, 1390 }; 1391 int i; 1392 1393 memcpy(frm, ¶m, sizeof(param)); 1394 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1395 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1396 *frm++ = 0; /* reserved field */ 1397 for (i = 0; i < WME_NUM_AC; i++) { 1398 const struct wmeParams *ac = 1399 &wme->wme_bssChanParams.cap_wmeParams[i]; 1400 *frm++ = SM(i, WME_PARAM_ACI) 1401 | SM(ac->wmep_acm, WME_PARAM_ACM) 1402 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1403 ; 1404 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1405 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1406 ; 1407 ADDSHORT(frm, ac->wmep_txopLimit); 1408 } 1409 return frm; 1410#undef SM 1411#undef ADDSHORT 1412} 1413#undef WME_OUI_BYTES 1414 1415/* 1416 * Add an 11h Power Constraint element to a frame. 1417 */ 1418static uint8_t * 1419ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1420{ 1421 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1422 /* XXX per-vap tx power limit? */ 1423 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1424 1425 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1426 frm[1] = 1; 1427 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1428 return frm + 3; 1429} 1430 1431/* 1432 * Add an 11h Power Capability element to a frame. 1433 */ 1434static uint8_t * 1435ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1436{ 1437 frm[0] = IEEE80211_ELEMID_PWRCAP; 1438 frm[1] = 2; 1439 frm[2] = c->ic_minpower; 1440 frm[3] = c->ic_maxpower; 1441 return frm + 4; 1442} 1443 1444/* 1445 * Add an 11h Supported Channels element to a frame. 1446 */ 1447static uint8_t * 1448ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1449{ 1450 static const int ielen = 26; 1451 1452 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1453 frm[1] = ielen; 1454 /* XXX not correct */ 1455 memcpy(frm+2, ic->ic_chan_avail, ielen); 1456 return frm + 2 + ielen; 1457} 1458 1459/* 1460 * Add an 11h Channel Switch Announcement element to a frame. 1461 * Note that we use the per-vap CSA count to adjust the global 1462 * counter so we can use this routine to form probe response 1463 * frames and get the current count. 1464 */ 1465static uint8_t * 1466ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1467{ 1468 struct ieee80211com *ic = vap->iv_ic; 1469 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1470 1471 csa->csa_ie = IEEE80211_ELEMID_CSA; 1472 csa->csa_len = 3; 1473 csa->csa_mode = 1; /* XXX force quiet on channel */ 1474 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1475 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1476 return frm + sizeof(*csa); 1477} 1478 1479/* 1480 * Add an 11h country information element to a frame. 1481 */ 1482static uint8_t * 1483ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1484{ 1485 1486 if (ic->ic_countryie == NULL || 1487 ic->ic_countryie_chan != ic->ic_bsschan) { 1488 /* 1489 * Handle lazy construction of ie. This is done on 1490 * first use and after a channel change that requires 1491 * re-calculation. 1492 */ 1493 if (ic->ic_countryie != NULL) 1494 free(ic->ic_countryie, M_80211_NODE_IE); 1495 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1496 if (ic->ic_countryie == NULL) 1497 return frm; 1498 ic->ic_countryie_chan = ic->ic_bsschan; 1499 } 1500 return add_appie(frm, ic->ic_countryie); 1501} 1502 1503/* 1504 * Send a probe request frame with the specified ssid 1505 * and any optional information element data. 1506 */ 1507int 1508ieee80211_send_probereq(struct ieee80211_node *ni, 1509 const uint8_t sa[IEEE80211_ADDR_LEN], 1510 const uint8_t da[IEEE80211_ADDR_LEN], 1511 const uint8_t bssid[IEEE80211_ADDR_LEN], 1512 const uint8_t *ssid, size_t ssidlen) 1513{ 1514 struct ieee80211vap *vap = ni->ni_vap; 1515 struct ieee80211com *ic = ni->ni_ic; 1516 const struct ieee80211_txparam *tp; 1517 struct ieee80211_bpf_params params; 1518 struct ieee80211_frame *wh; 1519 const struct ieee80211_rateset *rs; 1520 struct mbuf *m; 1521 uint8_t *frm; 1522 1523 if (vap->iv_state == IEEE80211_S_CAC) { 1524 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1525 "block %s frame in CAC state", "probe request"); 1526 vap->iv_stats.is_tx_badstate++; 1527 return EIO; /* XXX */ 1528 } 1529 1530 /* 1531 * Hold a reference on the node so it doesn't go away until after 1532 * the xmit is complete all the way in the driver. On error we 1533 * will remove our reference. 1534 */ 1535 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1536 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1537 __func__, __LINE__, 1538 ni, ether_sprintf(ni->ni_macaddr), 1539 ieee80211_node_refcnt(ni)+1); 1540 ieee80211_ref_node(ni); 1541 1542 /* 1543 * prreq frame format 1544 * [tlv] ssid 1545 * [tlv] supported rates 1546 * [tlv] RSN (optional) 1547 * [tlv] extended supported rates 1548 * [tlv] WPA (optional) 1549 * [tlv] user-specified ie's 1550 */ 1551 m = ieee80211_getmgtframe(&frm, 1552 ic->ic_headroom + sizeof(struct ieee80211_frame), 1553 2 + IEEE80211_NWID_LEN 1554 + 2 + IEEE80211_RATE_SIZE 1555 + sizeof(struct ieee80211_ie_wpa) 1556 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1557 + sizeof(struct ieee80211_ie_wpa) 1558 + (vap->iv_appie_probereq != NULL ? 1559 vap->iv_appie_probereq->ie_len : 0) 1560 ); 1561 if (m == NULL) { 1562 vap->iv_stats.is_tx_nobuf++; 1563 ieee80211_free_node(ni); 1564 return ENOMEM; 1565 } 1566 1567 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1568 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1569 frm = ieee80211_add_rates(frm, rs); 1570 if (vap->iv_flags & IEEE80211_F_WPA2) { 1571 if (vap->iv_rsn_ie != NULL) 1572 frm = add_ie(frm, vap->iv_rsn_ie); 1573 /* XXX else complain? */ 1574 } 1575 frm = ieee80211_add_xrates(frm, rs); 1576 if (vap->iv_flags & IEEE80211_F_WPA1) { 1577 if (vap->iv_wpa_ie != NULL) 1578 frm = add_ie(frm, vap->iv_wpa_ie); 1579 /* XXX else complain? */ 1580 } 1581 if (vap->iv_appie_probereq != NULL) 1582 frm = add_appie(frm, vap->iv_appie_probereq); 1583 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1584 1585 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1586 ("leading space %zd", M_LEADINGSPACE(m))); 1587 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1588 if (m == NULL) { 1589 /* NB: cannot happen */ 1590 ieee80211_free_node(ni); 1591 return ENOMEM; 1592 } 1593 1594 wh = mtod(m, struct ieee80211_frame *); 1595 ieee80211_send_setup(ni, m, 1596 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1597 IEEE80211_NONQOS_TID, sa, da, bssid); 1598 /* XXX power management? */ 1599 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1600 1601 M_WME_SETAC(m, WME_AC_BE); 1602 1603 IEEE80211_NODE_STAT(ni, tx_probereq); 1604 IEEE80211_NODE_STAT(ni, tx_mgmt); 1605 1606 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1607 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1608 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1609 ssidlen, ssid); 1610 1611 memset(¶ms, 0, sizeof(params)); 1612 params.ibp_pri = M_WME_GETAC(m); 1613 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1614 params.ibp_rate0 = tp->mgmtrate; 1615 if (IEEE80211_IS_MULTICAST(da)) { 1616 params.ibp_flags |= IEEE80211_BPF_NOACK; 1617 params.ibp_try0 = 1; 1618 } else 1619 params.ibp_try0 = tp->maxretry; 1620 params.ibp_power = ni->ni_txpower; 1621 return ic->ic_raw_xmit(ni, m, ¶ms); 1622} 1623 1624/* 1625 * Calculate capability information for mgt frames. 1626 */ 1627static uint16_t 1628getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1629{ 1630 struct ieee80211com *ic = vap->iv_ic; 1631 uint16_t capinfo; 1632 1633 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1634 1635 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1636 capinfo = IEEE80211_CAPINFO_ESS; 1637 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1638 capinfo = IEEE80211_CAPINFO_IBSS; 1639 else 1640 capinfo = 0; 1641 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1642 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1643 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1644 IEEE80211_IS_CHAN_2GHZ(chan)) 1645 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1646 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1647 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1648 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1649 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1650 return capinfo; 1651} 1652 1653/* 1654 * Send a management frame. The node is for the destination (or ic_bss 1655 * when in station mode). Nodes other than ic_bss have their reference 1656 * count bumped to reflect our use for an indeterminant time. 1657 */ 1658int 1659ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1660{ 1661#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1662#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1663 struct ieee80211vap *vap = ni->ni_vap; 1664 struct ieee80211com *ic = ni->ni_ic; 1665 struct ieee80211_node *bss = vap->iv_bss; 1666 struct ieee80211_bpf_params params; 1667 struct mbuf *m; 1668 uint8_t *frm; 1669 uint16_t capinfo; 1670 int has_challenge, is_shared_key, ret, status; 1671 1672 KASSERT(ni != NULL, ("null node")); 1673 1674 /* 1675 * Hold a reference on the node so it doesn't go away until after 1676 * the xmit is complete all the way in the driver. On error we 1677 * will remove our reference. 1678 */ 1679 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1680 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1681 __func__, __LINE__, 1682 ni, ether_sprintf(ni->ni_macaddr), 1683 ieee80211_node_refcnt(ni)+1); 1684 ieee80211_ref_node(ni); 1685 1686 memset(¶ms, 0, sizeof(params)); 1687 switch (type) { 1688 1689 case IEEE80211_FC0_SUBTYPE_AUTH: 1690 status = arg >> 16; 1691 arg &= 0xffff; 1692 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1693 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1694 ni->ni_challenge != NULL); 1695 1696 /* 1697 * Deduce whether we're doing open authentication or 1698 * shared key authentication. We do the latter if 1699 * we're in the middle of a shared key authentication 1700 * handshake or if we're initiating an authentication 1701 * request and configured to use shared key. 1702 */ 1703 is_shared_key = has_challenge || 1704 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1705 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1706 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1707 1708 m = ieee80211_getmgtframe(&frm, 1709 ic->ic_headroom + sizeof(struct ieee80211_frame), 1710 3 * sizeof(uint16_t) 1711 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1712 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1713 ); 1714 if (m == NULL) 1715 senderr(ENOMEM, is_tx_nobuf); 1716 1717 ((uint16_t *)frm)[0] = 1718 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1719 : htole16(IEEE80211_AUTH_ALG_OPEN); 1720 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1721 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1722 1723 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1724 ((uint16_t *)frm)[3] = 1725 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1726 IEEE80211_ELEMID_CHALLENGE); 1727 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1728 IEEE80211_CHALLENGE_LEN); 1729 m->m_pkthdr.len = m->m_len = 1730 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1731 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1732 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1733 "request encrypt frame (%s)", __func__); 1734 /* mark frame for encryption */ 1735 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1736 } 1737 } else 1738 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1739 1740 /* XXX not right for shared key */ 1741 if (status == IEEE80211_STATUS_SUCCESS) 1742 IEEE80211_NODE_STAT(ni, tx_auth); 1743 else 1744 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1745 1746 if (vap->iv_opmode == IEEE80211_M_STA) 1747 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1748 (void *) vap->iv_state); 1749 break; 1750 1751 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1752 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1753 "send station deauthenticate (reason %d)", arg); 1754 m = ieee80211_getmgtframe(&frm, 1755 ic->ic_headroom + sizeof(struct ieee80211_frame), 1756 sizeof(uint16_t)); 1757 if (m == NULL) 1758 senderr(ENOMEM, is_tx_nobuf); 1759 *(uint16_t *)frm = htole16(arg); /* reason */ 1760 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1761 1762 IEEE80211_NODE_STAT(ni, tx_deauth); 1763 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1764 1765 ieee80211_node_unauthorize(ni); /* port closed */ 1766 break; 1767 1768 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1769 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1770 /* 1771 * asreq frame format 1772 * [2] capability information 1773 * [2] listen interval 1774 * [6*] current AP address (reassoc only) 1775 * [tlv] ssid 1776 * [tlv] supported rates 1777 * [tlv] extended supported rates 1778 * [4] power capability (optional) 1779 * [28] supported channels (optional) 1780 * [tlv] HT capabilities 1781 * [tlv] WME (optional) 1782 * [tlv] Vendor OUI HT capabilities (optional) 1783 * [tlv] Atheros capabilities (if negotiated) 1784 * [tlv] AppIE's (optional) 1785 */ 1786 m = ieee80211_getmgtframe(&frm, 1787 ic->ic_headroom + sizeof(struct ieee80211_frame), 1788 sizeof(uint16_t) 1789 + sizeof(uint16_t) 1790 + IEEE80211_ADDR_LEN 1791 + 2 + IEEE80211_NWID_LEN 1792 + 2 + IEEE80211_RATE_SIZE 1793 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1794 + 4 1795 + 2 + 26 1796 + sizeof(struct ieee80211_wme_info) 1797 + sizeof(struct ieee80211_ie_htcap) 1798 + 4 + sizeof(struct ieee80211_ie_htcap) 1799#ifdef IEEE80211_SUPPORT_SUPERG 1800 + sizeof(struct ieee80211_ath_ie) 1801#endif 1802 + (vap->iv_appie_wpa != NULL ? 1803 vap->iv_appie_wpa->ie_len : 0) 1804 + (vap->iv_appie_assocreq != NULL ? 1805 vap->iv_appie_assocreq->ie_len : 0) 1806 ); 1807 if (m == NULL) 1808 senderr(ENOMEM, is_tx_nobuf); 1809 1810 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1811 ("wrong mode %u", vap->iv_opmode)); 1812 capinfo = IEEE80211_CAPINFO_ESS; 1813 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1814 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1815 /* 1816 * NB: Some 11a AP's reject the request when 1817 * short premable is set. 1818 */ 1819 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1820 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1821 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1822 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1823 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1824 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1825 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1826 (vap->iv_flags & IEEE80211_F_DOTH)) 1827 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1828 *(uint16_t *)frm = htole16(capinfo); 1829 frm += 2; 1830 1831 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1832 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1833 bss->ni_intval)); 1834 frm += 2; 1835 1836 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1837 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1838 frm += IEEE80211_ADDR_LEN; 1839 } 1840 1841 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1842 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1843 if (vap->iv_flags & IEEE80211_F_WPA2) { 1844 if (vap->iv_rsn_ie != NULL) 1845 frm = add_ie(frm, vap->iv_rsn_ie); 1846 /* XXX else complain? */ 1847 } 1848 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1849 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1850 frm = ieee80211_add_powercapability(frm, 1851 ic->ic_curchan); 1852 frm = ieee80211_add_supportedchannels(frm, ic); 1853 } 1854 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1855 ni->ni_ies.htcap_ie != NULL && 1856 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1857 frm = ieee80211_add_htcap(frm, ni); 1858 if (vap->iv_flags & IEEE80211_F_WPA1) { 1859 if (vap->iv_wpa_ie != NULL) 1860 frm = add_ie(frm, vap->iv_wpa_ie); 1861 /* XXX else complain */ 1862 } 1863 if ((ic->ic_flags & IEEE80211_F_WME) && 1864 ni->ni_ies.wme_ie != NULL) 1865 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1866 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1867 ni->ni_ies.htcap_ie != NULL && 1868 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1869 frm = ieee80211_add_htcap_vendor(frm, ni); 1870#ifdef IEEE80211_SUPPORT_SUPERG 1871 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1872 frm = ieee80211_add_ath(frm, 1873 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1874 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1875 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1876 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1877 } 1878#endif /* IEEE80211_SUPPORT_SUPERG */ 1879 if (vap->iv_appie_assocreq != NULL) 1880 frm = add_appie(frm, vap->iv_appie_assocreq); 1881 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1882 1883 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1884 (void *) vap->iv_state); 1885 break; 1886 1887 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1888 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1889 /* 1890 * asresp frame format 1891 * [2] capability information 1892 * [2] status 1893 * [2] association ID 1894 * [tlv] supported rates 1895 * [tlv] extended supported rates 1896 * [tlv] HT capabilities (standard, if STA enabled) 1897 * [tlv] HT information (standard, if STA enabled) 1898 * [tlv] WME (if configured and STA enabled) 1899 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1900 * [tlv] HT information (vendor OUI, if STA enabled) 1901 * [tlv] Atheros capabilities (if STA enabled) 1902 * [tlv] AppIE's (optional) 1903 */ 1904 m = ieee80211_getmgtframe(&frm, 1905 ic->ic_headroom + sizeof(struct ieee80211_frame), 1906 sizeof(uint16_t) 1907 + sizeof(uint16_t) 1908 + sizeof(uint16_t) 1909 + 2 + IEEE80211_RATE_SIZE 1910 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1911 + sizeof(struct ieee80211_ie_htcap) + 4 1912 + sizeof(struct ieee80211_ie_htinfo) + 4 1913 + sizeof(struct ieee80211_wme_param) 1914#ifdef IEEE80211_SUPPORT_SUPERG 1915 + sizeof(struct ieee80211_ath_ie) 1916#endif 1917 + (vap->iv_appie_assocresp != NULL ? 1918 vap->iv_appie_assocresp->ie_len : 0) 1919 ); 1920 if (m == NULL) 1921 senderr(ENOMEM, is_tx_nobuf); 1922 1923 capinfo = getcapinfo(vap, bss->ni_chan); 1924 *(uint16_t *)frm = htole16(capinfo); 1925 frm += 2; 1926 1927 *(uint16_t *)frm = htole16(arg); /* status */ 1928 frm += 2; 1929 1930 if (arg == IEEE80211_STATUS_SUCCESS) { 1931 *(uint16_t *)frm = htole16(ni->ni_associd); 1932 IEEE80211_NODE_STAT(ni, tx_assoc); 1933 } else 1934 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1935 frm += 2; 1936 1937 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1938 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1939 /* NB: respond according to what we received */ 1940 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1941 frm = ieee80211_add_htcap(frm, ni); 1942 frm = ieee80211_add_htinfo(frm, ni); 1943 } 1944 if ((vap->iv_flags & IEEE80211_F_WME) && 1945 ni->ni_ies.wme_ie != NULL) 1946 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1947 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1948 frm = ieee80211_add_htcap_vendor(frm, ni); 1949 frm = ieee80211_add_htinfo_vendor(frm, ni); 1950 } 1951#ifdef IEEE80211_SUPPORT_SUPERG 1952 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1953 frm = ieee80211_add_ath(frm, 1954 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1955 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1956 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1957 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1958#endif /* IEEE80211_SUPPORT_SUPERG */ 1959 if (vap->iv_appie_assocresp != NULL) 1960 frm = add_appie(frm, vap->iv_appie_assocresp); 1961 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1962 break; 1963 1964 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1965 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1966 "send station disassociate (reason %d)", arg); 1967 m = ieee80211_getmgtframe(&frm, 1968 ic->ic_headroom + sizeof(struct ieee80211_frame), 1969 sizeof(uint16_t)); 1970 if (m == NULL) 1971 senderr(ENOMEM, is_tx_nobuf); 1972 *(uint16_t *)frm = htole16(arg); /* reason */ 1973 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1974 1975 IEEE80211_NODE_STAT(ni, tx_disassoc); 1976 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1977 break; 1978 1979 default: 1980 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1981 "invalid mgmt frame type %u", type); 1982 senderr(EINVAL, is_tx_unknownmgt); 1983 /* NOTREACHED */ 1984 } 1985 1986 /* NB: force non-ProbeResp frames to the highest queue */ 1987 params.ibp_pri = WME_AC_VO; 1988 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1989 /* NB: we know all frames are unicast */ 1990 params.ibp_try0 = bss->ni_txparms->maxretry; 1991 params.ibp_power = bss->ni_txpower; 1992 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1993bad: 1994 ieee80211_free_node(ni); 1995 return ret; 1996#undef senderr 1997#undef HTFLAGS 1998} 1999 2000/* 2001 * Return an mbuf with a probe response frame in it. 2002 * Space is left to prepend and 802.11 header at the 2003 * front but it's left to the caller to fill in. 2004 */ 2005struct mbuf * 2006ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2007{ 2008 struct ieee80211vap *vap = bss->ni_vap; 2009 struct ieee80211com *ic = bss->ni_ic; 2010 const struct ieee80211_rateset *rs; 2011 struct mbuf *m; 2012 uint16_t capinfo; 2013 uint8_t *frm; 2014 2015 /* 2016 * probe response frame format 2017 * [8] time stamp 2018 * [2] beacon interval 2019 * [2] cabability information 2020 * [tlv] ssid 2021 * [tlv] supported rates 2022 * [tlv] parameter set (FH/DS) 2023 * [tlv] parameter set (IBSS) 2024 * [tlv] country (optional) 2025 * [3] power control (optional) 2026 * [5] channel switch announcement (CSA) (optional) 2027 * [tlv] extended rate phy (ERP) 2028 * [tlv] extended supported rates 2029 * [tlv] RSN (optional) 2030 * [tlv] HT capabilities 2031 * [tlv] HT information 2032 * [tlv] WPA (optional) 2033 * [tlv] WME (optional) 2034 * [tlv] Vendor OUI HT capabilities (optional) 2035 * [tlv] Vendor OUI HT information (optional) 2036 * [tlv] Atheros capabilities 2037 * [tlv] AppIE's (optional) 2038 */ 2039 m = ieee80211_getmgtframe(&frm, 2040 ic->ic_headroom + sizeof(struct ieee80211_frame), 2041 8 2042 + sizeof(uint16_t) 2043 + sizeof(uint16_t) 2044 + 2 + IEEE80211_NWID_LEN 2045 + 2 + IEEE80211_RATE_SIZE 2046 + 7 /* max(7,3) */ 2047 + IEEE80211_COUNTRY_MAX_SIZE 2048 + 3 2049 + sizeof(struct ieee80211_csa_ie) 2050 + 3 2051 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2052 + sizeof(struct ieee80211_ie_wpa) 2053 + sizeof(struct ieee80211_ie_htcap) 2054 + sizeof(struct ieee80211_ie_htinfo) 2055 + sizeof(struct ieee80211_ie_wpa) 2056 + sizeof(struct ieee80211_wme_param) 2057 + 4 + sizeof(struct ieee80211_ie_htcap) 2058 + 4 + sizeof(struct ieee80211_ie_htinfo) 2059#ifdef IEEE80211_SUPPORT_SUPERG 2060 + sizeof(struct ieee80211_ath_ie) 2061#endif 2062 + (vap->iv_appie_proberesp != NULL ? 2063 vap->iv_appie_proberesp->ie_len : 0) 2064 ); 2065 if (m == NULL) { 2066 vap->iv_stats.is_tx_nobuf++; 2067 return NULL; 2068 } 2069 2070 memset(frm, 0, 8); /* timestamp should be filled later */ 2071 frm += 8; 2072 *(uint16_t *)frm = htole16(bss->ni_intval); 2073 frm += 2; 2074 capinfo = getcapinfo(vap, bss->ni_chan); 2075 *(uint16_t *)frm = htole16(capinfo); 2076 frm += 2; 2077 2078 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2079 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2080 frm = ieee80211_add_rates(frm, rs); 2081 2082 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2083 *frm++ = IEEE80211_ELEMID_FHPARMS; 2084 *frm++ = 5; 2085 *frm++ = bss->ni_fhdwell & 0x00ff; 2086 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2087 *frm++ = IEEE80211_FH_CHANSET( 2088 ieee80211_chan2ieee(ic, bss->ni_chan)); 2089 *frm++ = IEEE80211_FH_CHANPAT( 2090 ieee80211_chan2ieee(ic, bss->ni_chan)); 2091 *frm++ = bss->ni_fhindex; 2092 } else { 2093 *frm++ = IEEE80211_ELEMID_DSPARMS; 2094 *frm++ = 1; 2095 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2096 } 2097 2098 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2099 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2100 *frm++ = 2; 2101 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2102 } 2103 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2104 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2105 frm = ieee80211_add_countryie(frm, ic); 2106 if (vap->iv_flags & IEEE80211_F_DOTH) { 2107 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2108 frm = ieee80211_add_powerconstraint(frm, vap); 2109 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2110 frm = ieee80211_add_csa(frm, vap); 2111 } 2112 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2113 frm = ieee80211_add_erp(frm, ic); 2114 frm = ieee80211_add_xrates(frm, rs); 2115 if (vap->iv_flags & IEEE80211_F_WPA2) { 2116 if (vap->iv_rsn_ie != NULL) 2117 frm = add_ie(frm, vap->iv_rsn_ie); 2118 /* XXX else complain? */ 2119 } 2120 /* 2121 * NB: legacy 11b clients do not get certain ie's. 2122 * The caller identifies such clients by passing 2123 * a token in legacy to us. Could expand this to be 2124 * any legacy client for stuff like HT ie's. 2125 */ 2126 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2127 legacy != IEEE80211_SEND_LEGACY_11B) { 2128 frm = ieee80211_add_htcap(frm, bss); 2129 frm = ieee80211_add_htinfo(frm, bss); 2130 } 2131 if (vap->iv_flags & IEEE80211_F_WPA1) { 2132 if (vap->iv_wpa_ie != NULL) 2133 frm = add_ie(frm, vap->iv_wpa_ie); 2134 /* XXX else complain? */ 2135 } 2136 if (vap->iv_flags & IEEE80211_F_WME) 2137 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2138 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2139 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2140 legacy != IEEE80211_SEND_LEGACY_11B) { 2141 frm = ieee80211_add_htcap_vendor(frm, bss); 2142 frm = ieee80211_add_htinfo_vendor(frm, bss); 2143 } 2144#ifdef IEEE80211_SUPPORT_SUPERG 2145 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2146 legacy != IEEE80211_SEND_LEGACY_11B) 2147 frm = ieee80211_add_athcaps(frm, bss); 2148#endif 2149 if (vap->iv_appie_proberesp != NULL) 2150 frm = add_appie(frm, vap->iv_appie_proberesp); 2151 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2152 2153 return m; 2154} 2155 2156/* 2157 * Send a probe response frame to the specified mac address. 2158 * This does not go through the normal mgt frame api so we 2159 * can specify the destination address and re-use the bss node 2160 * for the sta reference. 2161 */ 2162int 2163ieee80211_send_proberesp(struct ieee80211vap *vap, 2164 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2165{ 2166 struct ieee80211_node *bss = vap->iv_bss; 2167 struct ieee80211com *ic = vap->iv_ic; 2168 struct ieee80211_frame *wh; 2169 struct mbuf *m; 2170 2171 if (vap->iv_state == IEEE80211_S_CAC) { 2172 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2173 "block %s frame in CAC state", "probe response"); 2174 vap->iv_stats.is_tx_badstate++; 2175 return EIO; /* XXX */ 2176 } 2177 2178 /* 2179 * Hold a reference on the node so it doesn't go away until after 2180 * the xmit is complete all the way in the driver. On error we 2181 * will remove our reference. 2182 */ 2183 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2184 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2185 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2186 ieee80211_node_refcnt(bss)+1); 2187 ieee80211_ref_node(bss); 2188 2189 m = ieee80211_alloc_proberesp(bss, legacy); 2190 if (m == NULL) { 2191 ieee80211_free_node(bss); 2192 return ENOMEM; 2193 } 2194 2195 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2196 KASSERT(m != NULL, ("no room for header")); 2197 2198 wh = mtod(m, struct ieee80211_frame *); 2199 ieee80211_send_setup(bss, m, 2200 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2201 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2202 /* XXX power management? */ 2203 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2204 2205 M_WME_SETAC(m, WME_AC_BE); 2206 2207 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2208 "send probe resp on channel %u to %s%s\n", 2209 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2210 legacy ? " <legacy>" : ""); 2211 IEEE80211_NODE_STAT(bss, tx_mgmt); 2212 2213 return ic->ic_raw_xmit(bss, m, NULL); 2214} 2215 2216/* 2217 * Allocate and build a RTS (Request To Send) control frame. 2218 */ 2219struct mbuf * 2220ieee80211_alloc_rts(struct ieee80211com *ic, 2221 const uint8_t ra[IEEE80211_ADDR_LEN], 2222 const uint8_t ta[IEEE80211_ADDR_LEN], 2223 uint16_t dur) 2224{ 2225 struct ieee80211_frame_rts *rts; 2226 struct mbuf *m; 2227 2228 /* XXX honor ic_headroom */ 2229 m = m_gethdr(M_DONTWAIT, MT_DATA); 2230 if (m != NULL) { 2231 rts = mtod(m, struct ieee80211_frame_rts *); 2232 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2233 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2234 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2235 *(u_int16_t *)rts->i_dur = htole16(dur); 2236 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2237 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2238 2239 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2240 } 2241 return m; 2242} 2243 2244/* 2245 * Allocate and build a CTS (Clear To Send) control frame. 2246 */ 2247struct mbuf * 2248ieee80211_alloc_cts(struct ieee80211com *ic, 2249 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2250{ 2251 struct ieee80211_frame_cts *cts; 2252 struct mbuf *m; 2253 2254 /* XXX honor ic_headroom */ 2255 m = m_gethdr(M_DONTWAIT, MT_DATA); 2256 if (m != NULL) { 2257 cts = mtod(m, struct ieee80211_frame_cts *); 2258 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2259 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2260 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2261 *(u_int16_t *)cts->i_dur = htole16(dur); 2262 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2263 2264 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2265 } 2266 return m; 2267} 2268 2269static void 2270ieee80211_tx_mgt_timeout(void *arg) 2271{ 2272 struct ieee80211_node *ni = arg; 2273 struct ieee80211vap *vap = ni->ni_vap; 2274 2275 if (vap->iv_state != IEEE80211_S_INIT && 2276 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2277 /* 2278 * NB: it's safe to specify a timeout as the reason here; 2279 * it'll only be used in the right state. 2280 */ 2281 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2282 IEEE80211_SCAN_FAIL_TIMEOUT); 2283 } 2284} 2285 2286static void 2287ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2288{ 2289 struct ieee80211vap *vap = ni->ni_vap; 2290 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2291 2292 /* 2293 * Frame transmit completed; arrange timer callback. If 2294 * transmit was successfuly we wait for response. Otherwise 2295 * we arrange an immediate callback instead of doing the 2296 * callback directly since we don't know what state the driver 2297 * is in (e.g. what locks it is holding). This work should 2298 * not be too time-critical and not happen too often so the 2299 * added overhead is acceptable. 2300 * 2301 * XXX what happens if !acked but response shows up before callback? 2302 */ 2303 if (vap->iv_state == ostate) 2304 callout_reset(&vap->iv_mgtsend, 2305 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2306 ieee80211_tx_mgt_timeout, ni); 2307} 2308 2309static void 2310ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2311 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2312{ 2313 struct ieee80211vap *vap = ni->ni_vap; 2314 struct ieee80211com *ic = ni->ni_ic; 2315 struct ieee80211_rateset *rs = &ni->ni_rates; 2316 uint16_t capinfo; 2317 2318 /* 2319 * beacon frame format 2320 * [8] time stamp 2321 * [2] beacon interval 2322 * [2] cabability information 2323 * [tlv] ssid 2324 * [tlv] supported rates 2325 * [3] parameter set (DS) 2326 * [8] CF parameter set (optional) 2327 * [tlv] parameter set (IBSS/TIM) 2328 * [tlv] country (optional) 2329 * [3] power control (optional) 2330 * [5] channel switch announcement (CSA) (optional) 2331 * [tlv] extended rate phy (ERP) 2332 * [tlv] extended supported rates 2333 * [tlv] RSN parameters 2334 * [tlv] HT capabilities 2335 * [tlv] HT information 2336 * XXX Vendor-specific OIDs (e.g. Atheros) 2337 * [tlv] WPA parameters 2338 * [tlv] WME parameters 2339 * [tlv] Vendor OUI HT capabilities (optional) 2340 * [tlv] Vendor OUI HT information (optional) 2341 * [tlv] Atheros capabilities (optional) 2342 * [tlv] TDMA parameters (optional) 2343 * [tlv] application data (optional) 2344 */ 2345 2346 memset(bo, 0, sizeof(*bo)); 2347 2348 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2349 frm += 8; 2350 *(uint16_t *)frm = htole16(ni->ni_intval); 2351 frm += 2; 2352 capinfo = getcapinfo(vap, ni->ni_chan); 2353 bo->bo_caps = (uint16_t *)frm; 2354 *(uint16_t *)frm = htole16(capinfo); 2355 frm += 2; 2356 *frm++ = IEEE80211_ELEMID_SSID; 2357 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2358 *frm++ = ni->ni_esslen; 2359 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2360 frm += ni->ni_esslen; 2361 } else 2362 *frm++ = 0; 2363 frm = ieee80211_add_rates(frm, rs); 2364 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2365 *frm++ = IEEE80211_ELEMID_DSPARMS; 2366 *frm++ = 1; 2367 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2368 } 2369 if (ic->ic_flags & IEEE80211_F_PCF) { 2370 bo->bo_cfp = frm; 2371 frm = ieee80211_add_cfparms(frm, ic); 2372 } 2373 bo->bo_tim = frm; 2374 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2375 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2376 *frm++ = 2; 2377 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2378 bo->bo_tim_len = 0; 2379 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2380 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2381 2382 tie->tim_ie = IEEE80211_ELEMID_TIM; 2383 tie->tim_len = 4; /* length */ 2384 tie->tim_count = 0; /* DTIM count */ 2385 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2386 tie->tim_bitctl = 0; /* bitmap control */ 2387 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2388 frm += sizeof(struct ieee80211_tim_ie); 2389 bo->bo_tim_len = 1; 2390 } 2391 bo->bo_tim_trailer = frm; 2392 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2393 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2394 frm = ieee80211_add_countryie(frm, ic); 2395 if (vap->iv_flags & IEEE80211_F_DOTH) { 2396 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2397 frm = ieee80211_add_powerconstraint(frm, vap); 2398 bo->bo_csa = frm; 2399 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2400 frm = ieee80211_add_csa(frm, vap); 2401 } else 2402 bo->bo_csa = frm; 2403 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2404 bo->bo_erp = frm; 2405 frm = ieee80211_add_erp(frm, ic); 2406 } 2407 frm = ieee80211_add_xrates(frm, rs); 2408 if (vap->iv_flags & IEEE80211_F_WPA2) { 2409 if (vap->iv_rsn_ie != NULL) 2410 frm = add_ie(frm, vap->iv_rsn_ie); 2411 /* XXX else complain */ 2412 } 2413 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2414 frm = ieee80211_add_htcap(frm, ni); 2415 bo->bo_htinfo = frm; 2416 frm = ieee80211_add_htinfo(frm, ni); 2417 } 2418 if (vap->iv_flags & IEEE80211_F_WPA1) { 2419 if (vap->iv_wpa_ie != NULL) 2420 frm = add_ie(frm, vap->iv_wpa_ie); 2421 /* XXX else complain */ 2422 } 2423 if (vap->iv_flags & IEEE80211_F_WME) { 2424 bo->bo_wme = frm; 2425 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2426 } 2427 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2428 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2429 frm = ieee80211_add_htcap_vendor(frm, ni); 2430 frm = ieee80211_add_htinfo_vendor(frm, ni); 2431 } 2432#ifdef IEEE80211_SUPPORT_SUPERG 2433 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2434 bo->bo_ath = frm; 2435 frm = ieee80211_add_athcaps(frm, ni); 2436 } 2437#endif 2438#ifdef IEEE80211_SUPPORT_TDMA 2439 if (vap->iv_caps & IEEE80211_C_TDMA) { 2440 bo->bo_tdma = frm; 2441 frm = ieee80211_add_tdma(frm, vap); 2442 } 2443#endif 2444 if (vap->iv_appie_beacon != NULL) { 2445 bo->bo_appie = frm; 2446 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2447 frm = add_appie(frm, vap->iv_appie_beacon); 2448 } 2449 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2450 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2451 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2452} 2453 2454/* 2455 * Allocate a beacon frame and fillin the appropriate bits. 2456 */ 2457struct mbuf * 2458ieee80211_beacon_alloc(struct ieee80211_node *ni, 2459 struct ieee80211_beacon_offsets *bo) 2460{ 2461 struct ieee80211vap *vap = ni->ni_vap; 2462 struct ieee80211com *ic = ni->ni_ic; 2463 struct ifnet *ifp = vap->iv_ifp; 2464 struct ieee80211_frame *wh; 2465 struct mbuf *m; 2466 int pktlen; 2467 uint8_t *frm; 2468 2469 /* 2470 * beacon frame format 2471 * [8] time stamp 2472 * [2] beacon interval 2473 * [2] cabability information 2474 * [tlv] ssid 2475 * [tlv] supported rates 2476 * [3] parameter set (DS) 2477 * [8] CF parameter set (optional) 2478 * [tlv] parameter set (IBSS/TIM) 2479 * [tlv] country (optional) 2480 * [3] power control (optional) 2481 * [5] channel switch announcement (CSA) (optional) 2482 * [tlv] extended rate phy (ERP) 2483 * [tlv] extended supported rates 2484 * [tlv] RSN parameters 2485 * [tlv] HT capabilities 2486 * [tlv] HT information 2487 * [tlv] Vendor OUI HT capabilities (optional) 2488 * [tlv] Vendor OUI HT information (optional) 2489 * XXX Vendor-specific OIDs (e.g. Atheros) 2490 * [tlv] WPA parameters 2491 * [tlv] WME parameters 2492 * [tlv] TDMA parameters (optional) 2493 * [tlv] application data (optional) 2494 * NB: we allocate the max space required for the TIM bitmap. 2495 * XXX how big is this? 2496 */ 2497 pktlen = 8 /* time stamp */ 2498 + sizeof(uint16_t) /* beacon interval */ 2499 + sizeof(uint16_t) /* capabilities */ 2500 + 2 + ni->ni_esslen /* ssid */ 2501 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2502 + 2 + 1 /* DS parameters */ 2503 + 2 + 6 /* CF parameters */ 2504 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2505 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2506 + 2 + 1 /* power control */ 2507 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2508 + 2 + 1 /* ERP */ 2509 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2510 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2511 2*sizeof(struct ieee80211_ie_wpa) : 0) 2512 /* XXX conditional? */ 2513 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2514 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2515 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2516 sizeof(struct ieee80211_wme_param) : 0) 2517#ifdef IEEE80211_SUPPORT_SUPERG 2518 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2519#endif 2520#ifdef IEEE80211_SUPPORT_TDMA 2521 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2522 sizeof(struct ieee80211_tdma_param) : 0) 2523#endif 2524 + IEEE80211_MAX_APPIE 2525 ; 2526 m = ieee80211_getmgtframe(&frm, 2527 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2528 if (m == NULL) { 2529 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2530 "%s: cannot get buf; size %u\n", __func__, pktlen); 2531 vap->iv_stats.is_tx_nobuf++; 2532 return NULL; 2533 } 2534 ieee80211_beacon_construct(m, frm, bo, ni); 2535 2536 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2537 KASSERT(m != NULL, ("no space for 802.11 header?")); 2538 wh = mtod(m, struct ieee80211_frame *); 2539 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2540 IEEE80211_FC0_SUBTYPE_BEACON; 2541 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2542 *(uint16_t *)wh->i_dur = 0; 2543 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2544 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2545 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2546 *(uint16_t *)wh->i_seq = 0; 2547 2548 return m; 2549} 2550 2551/* 2552 * Update the dynamic parts of a beacon frame based on the current state. 2553 */ 2554int 2555ieee80211_beacon_update(struct ieee80211_node *ni, 2556 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2557{ 2558 struct ieee80211vap *vap = ni->ni_vap; 2559 struct ieee80211com *ic = ni->ni_ic; 2560 int len_changed = 0; 2561 uint16_t capinfo; 2562 2563 IEEE80211_LOCK(ic); 2564 /* 2565 * Handle 11h channel change when we've reached the count. 2566 * We must recalculate the beacon frame contents to account 2567 * for the new channel. Note we do this only for the first 2568 * vap that reaches this point; subsequent vaps just update 2569 * their beacon state to reflect the recalculated channel. 2570 */ 2571 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2572 vap->iv_csa_count == ic->ic_csa_count) { 2573 vap->iv_csa_count = 0; 2574 /* 2575 * Effect channel change before reconstructing the beacon 2576 * frame contents as many places reference ni_chan. 2577 */ 2578 if (ic->ic_csa_newchan != NULL) 2579 ieee80211_csa_completeswitch(ic); 2580 /* 2581 * NB: ieee80211_beacon_construct clears all pending 2582 * updates in bo_flags so we don't need to explicitly 2583 * clear IEEE80211_BEACON_CSA. 2584 */ 2585 ieee80211_beacon_construct(m, 2586 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2587 2588 /* XXX do WME aggressive mode processing? */ 2589 IEEE80211_UNLOCK(ic); 2590 return 1; /* just assume length changed */ 2591 } 2592 2593 /* XXX faster to recalculate entirely or just changes? */ 2594 capinfo = getcapinfo(vap, ni->ni_chan); 2595 *bo->bo_caps = htole16(capinfo); 2596 2597 if (vap->iv_flags & IEEE80211_F_WME) { 2598 struct ieee80211_wme_state *wme = &ic->ic_wme; 2599 2600 /* 2601 * Check for agressive mode change. When there is 2602 * significant high priority traffic in the BSS 2603 * throttle back BE traffic by using conservative 2604 * parameters. Otherwise BE uses agressive params 2605 * to optimize performance of legacy/non-QoS traffic. 2606 */ 2607 if (wme->wme_flags & WME_F_AGGRMODE) { 2608 if (wme->wme_hipri_traffic > 2609 wme->wme_hipri_switch_thresh) { 2610 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2611 "%s: traffic %u, disable aggressive mode\n", 2612 __func__, wme->wme_hipri_traffic); 2613 wme->wme_flags &= ~WME_F_AGGRMODE; 2614 ieee80211_wme_updateparams_locked(vap); 2615 wme->wme_hipri_traffic = 2616 wme->wme_hipri_switch_hysteresis; 2617 } else 2618 wme->wme_hipri_traffic = 0; 2619 } else { 2620 if (wme->wme_hipri_traffic <= 2621 wme->wme_hipri_switch_thresh) { 2622 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2623 "%s: traffic %u, enable aggressive mode\n", 2624 __func__, wme->wme_hipri_traffic); 2625 wme->wme_flags |= WME_F_AGGRMODE; 2626 ieee80211_wme_updateparams_locked(vap); 2627 wme->wme_hipri_traffic = 0; 2628 } else 2629 wme->wme_hipri_traffic = 2630 wme->wme_hipri_switch_hysteresis; 2631 } 2632 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2633 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2634 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2635 } 2636 } 2637 2638 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2639 ieee80211_ht_update_beacon(vap, bo); 2640 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2641 } 2642#ifdef IEEE80211_SUPPORT_TDMA 2643 if (vap->iv_caps & IEEE80211_C_TDMA) { 2644 /* 2645 * NB: the beacon is potentially updated every TBTT. 2646 */ 2647 ieee80211_tdma_update_beacon(vap, bo); 2648 } 2649#endif 2650 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2651 struct ieee80211_tim_ie *tie = 2652 (struct ieee80211_tim_ie *) bo->bo_tim; 2653 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2654 u_int timlen, timoff, i; 2655 /* 2656 * ATIM/DTIM needs updating. If it fits in the 2657 * current space allocated then just copy in the 2658 * new bits. Otherwise we need to move any trailing 2659 * data to make room. Note that we know there is 2660 * contiguous space because ieee80211_beacon_allocate 2661 * insures there is space in the mbuf to write a 2662 * maximal-size virtual bitmap (based on iv_max_aid). 2663 */ 2664 /* 2665 * Calculate the bitmap size and offset, copy any 2666 * trailer out of the way, and then copy in the 2667 * new bitmap and update the information element. 2668 * Note that the tim bitmap must contain at least 2669 * one byte and any offset must be even. 2670 */ 2671 if (vap->iv_ps_pending != 0) { 2672 timoff = 128; /* impossibly large */ 2673 for (i = 0; i < vap->iv_tim_len; i++) 2674 if (vap->iv_tim_bitmap[i]) { 2675 timoff = i &~ 1; 2676 break; 2677 } 2678 KASSERT(timoff != 128, ("tim bitmap empty!")); 2679 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2680 if (vap->iv_tim_bitmap[i]) 2681 break; 2682 timlen = 1 + (i - timoff); 2683 } else { 2684 timoff = 0; 2685 timlen = 1; 2686 } 2687 if (timlen != bo->bo_tim_len) { 2688 /* copy up/down trailer */ 2689 int adjust = tie->tim_bitmap+timlen 2690 - bo->bo_tim_trailer; 2691 ovbcopy(bo->bo_tim_trailer, 2692 bo->bo_tim_trailer+adjust, 2693 bo->bo_tim_trailer_len); 2694 bo->bo_tim_trailer += adjust; 2695 bo->bo_erp += adjust; 2696 bo->bo_htinfo += adjust; 2697#ifdef IEEE80211_SUPERG_SUPPORT 2698 bo->bo_ath += adjust; 2699#endif 2700#ifdef IEEE80211_TDMA_SUPPORT 2701 bo->bo_tdma += adjust; 2702#endif 2703 bo->bo_appie += adjust; 2704 bo->bo_wme += adjust; 2705 bo->bo_csa += adjust; 2706 bo->bo_tim_len = timlen; 2707 2708 /* update information element */ 2709 tie->tim_len = 3 + timlen; 2710 tie->tim_bitctl = timoff; 2711 len_changed = 1; 2712 } 2713 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2714 bo->bo_tim_len); 2715 2716 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2717 2718 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2719 "%s: TIM updated, pending %u, off %u, len %u\n", 2720 __func__, vap->iv_ps_pending, timoff, timlen); 2721 } 2722 /* count down DTIM period */ 2723 if (tie->tim_count == 0) 2724 tie->tim_count = tie->tim_period - 1; 2725 else 2726 tie->tim_count--; 2727 /* update state for buffered multicast frames on DTIM */ 2728 if (mcast && tie->tim_count == 0) 2729 tie->tim_bitctl |= 1; 2730 else 2731 tie->tim_bitctl &= ~1; 2732 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2733 struct ieee80211_csa_ie *csa = 2734 (struct ieee80211_csa_ie *) bo->bo_csa; 2735 2736 /* 2737 * Insert or update CSA ie. If we're just starting 2738 * to count down to the channel switch then we need 2739 * to insert the CSA ie. Otherwise we just need to 2740 * drop the count. The actual change happens above 2741 * when the vap's count reaches the target count. 2742 */ 2743 if (vap->iv_csa_count == 0) { 2744 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2745 bo->bo_erp += sizeof(*csa); 2746 bo->bo_htinfo += sizeof(*csa); 2747 bo->bo_wme += sizeof(*csa); 2748#ifdef IEEE80211_SUPERG_SUPPORT 2749 bo->bo_ath += sizeof(*csa); 2750#endif 2751#ifdef IEEE80211_TDMA_SUPPORT 2752 bo->bo_tdma += sizeof(*csa); 2753#endif 2754 bo->bo_appie += sizeof(*csa); 2755 bo->bo_csa_trailer_len += sizeof(*csa); 2756 bo->bo_tim_trailer_len += sizeof(*csa); 2757 m->m_len += sizeof(*csa); 2758 m->m_pkthdr.len += sizeof(*csa); 2759 2760 ieee80211_add_csa(bo->bo_csa, vap); 2761 } else 2762 csa->csa_count--; 2763 vap->iv_csa_count++; 2764 /* NB: don't clear IEEE80211_BEACON_CSA */ 2765 } 2766 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2767 /* 2768 * ERP element needs updating. 2769 */ 2770 (void) ieee80211_add_erp(bo->bo_erp, ic); 2771 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2772 } 2773#ifdef IEEE80211_SUPPORT_SUPERG 2774 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2775 ieee80211_add_athcaps(bo->bo_ath, ni); 2776 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2777 } 2778#endif 2779 } 2780 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2781 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2782 int aielen; 2783 uint8_t *frm; 2784 2785 aielen = 0; 2786 if (aie != NULL) 2787 aielen += aie->ie_len; 2788 if (aielen != bo->bo_appie_len) { 2789 /* copy up/down trailer */ 2790 int adjust = aielen - bo->bo_appie_len; 2791 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2792 bo->bo_tim_trailer_len); 2793 bo->bo_tim_trailer += adjust; 2794 bo->bo_appie += adjust; 2795 bo->bo_appie_len = aielen; 2796 2797 len_changed = 1; 2798 } 2799 frm = bo->bo_appie; 2800 if (aie != NULL) 2801 frm = add_appie(frm, aie); 2802 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2803 } 2804 IEEE80211_UNLOCK(ic); 2805 2806 return len_changed; 2807} 2808