ieee80211_output.c revision 191553
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 191553 2009-04-26 23:02:17Z 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 /* XXX fragmented frames not handled */ 311 if (bpf_peers_present(vap->iv_rawbpf)) 312 bpf_mtap(vap->iv_rawbpf, m); 313 314 error = parent->if_transmit(parent, m); 315 if (error != 0) { 316 /* NB: IFQ_HANDOFF reclaims mbuf */ 317 ieee80211_free_node(ni); 318 } else { 319 ifp->if_opackets++; 320 } 321 ic->ic_lastdata = ticks; 322 } 323#undef IS_DWDS 324} 325 326/* 327 * 802.11 output routine. This is (currently) used only to 328 * connect bpf write calls to the 802.11 layer for injecting 329 * raw 802.11 frames. 330 */ 331int 332ieee80211_output(struct ifnet *ifp, struct mbuf *m, 333 struct sockaddr *dst, struct route *ro) 334{ 335#define senderr(e) do { error = (e); goto bad;} while (0) 336 struct ieee80211_node *ni = NULL; 337 struct ieee80211vap *vap; 338 struct ieee80211_frame *wh; 339 int error; 340 341 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 342 /* 343 * Short-circuit requests if the vap is marked OACTIVE 344 * as this is used when tearing down state to indicate 345 * the vap may be gone. This can also happen because a 346 * packet came down through ieee80211_start before the 347 * vap entered RUN state in which case it's also ok to 348 * just drop the frame. This should not be necessary 349 * but callers of if_output don't check OACTIVE. 350 */ 351 senderr(ENETDOWN); 352 } 353 vap = ifp->if_softc; 354 /* 355 * Hand to the 802.3 code if not tagged as 356 * a raw 802.11 frame. 357 */ 358 if (dst->sa_family != AF_IEEE80211) 359 return vap->iv_output(ifp, m, dst, ro); 360#ifdef MAC 361 error = mac_check_ifnet_transmit(ifp, m); 362 if (error) 363 senderr(error); 364#endif 365 if (ifp->if_flags & IFF_MONITOR) 366 senderr(ENETDOWN); 367 if (!IFNET_IS_UP_RUNNING(ifp)) 368 senderr(ENETDOWN); 369 if (vap->iv_state == IEEE80211_S_CAC) { 370 IEEE80211_DPRINTF(vap, 371 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 372 "block %s frame in CAC state\n", "raw data"); 373 vap->iv_stats.is_tx_badstate++; 374 senderr(EIO); /* XXX */ 375 } 376 /* XXX bypass bridge, pfil, carp, etc. */ 377 378 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 379 senderr(EIO); /* XXX */ 380 wh = mtod(m, struct ieee80211_frame *); 381 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 382 IEEE80211_FC0_VERSION_0) 383 senderr(EIO); /* XXX */ 384 385 /* locate destination node */ 386 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 387 case IEEE80211_FC1_DIR_NODS: 388 case IEEE80211_FC1_DIR_FROMDS: 389 ni = ieee80211_find_txnode(vap, wh->i_addr1); 390 break; 391 case IEEE80211_FC1_DIR_TODS: 392 case IEEE80211_FC1_DIR_DSTODS: 393 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 394 senderr(EIO); /* XXX */ 395 ni = ieee80211_find_txnode(vap, wh->i_addr3); 396 break; 397 default: 398 senderr(EIO); /* XXX */ 399 } 400 if (ni == NULL) { 401 /* 402 * Permit packets w/ bpf params through regardless 403 * (see below about sa_len). 404 */ 405 if (dst->sa_len == 0) 406 senderr(EHOSTUNREACH); 407 ni = ieee80211_ref_node(vap->iv_bss); 408 } 409 410 /* 411 * Sanitize mbuf for net80211 flags leaked from above. 412 * 413 * NB: This must be done before ieee80211_classify as 414 * it marks EAPOL in frames with M_EAPOL. 415 */ 416 m->m_flags &= ~M_80211_TX; 417 418 /* calculate priority so drivers can find the tx queue */ 419 /* XXX assumes an 802.3 frame */ 420 if (ieee80211_classify(ni, m)) 421 senderr(EIO); /* XXX */ 422 423 if (bpf_peers_present(vap->iv_rawbpf)) 424 bpf_mtap(vap->iv_rawbpf, m); 425 426 IEEE80211_NODE_STAT(ni, tx_data); 427 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 428 IEEE80211_NODE_STAT(ni, tx_mcast); 429 m->m_flags |= M_MCAST; 430 } else 431 IEEE80211_NODE_STAT(ni, tx_ucast); 432 /* NB: ieee80211_encap does not include 802.11 header */ 433 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 434 435 /* 436 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 437 * present by setting the sa_len field of the sockaddr (yes, 438 * this is a hack). 439 * NB: we assume sa_data is suitably aligned to cast. 440 */ 441 return vap->iv_ic->ic_raw_xmit(ni, m, 442 (const struct ieee80211_bpf_params *)(dst->sa_len ? 443 dst->sa_data : NULL)); 444bad: 445 if (m != NULL) 446 m_freem(m); 447 if (ni != NULL) 448 ieee80211_free_node(ni); 449 return error; 450#undef senderr 451} 452 453/* 454 * Set the direction field and address fields of an outgoing 455 * frame. Note this should be called early on in constructing 456 * a frame as it sets i_fc[1]; other bits can then be or'd in. 457 */ 458static void 459ieee80211_send_setup( 460 struct ieee80211_node *ni, 461 struct mbuf *m, 462 int type, int tid, 463 const uint8_t sa[IEEE80211_ADDR_LEN], 464 const uint8_t da[IEEE80211_ADDR_LEN], 465 const uint8_t bssid[IEEE80211_ADDR_LEN]) 466{ 467#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 468 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 469 ieee80211_seq seqno; 470 471 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 472 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 473 struct ieee80211vap *vap = ni->ni_vap; 474 475 switch (vap->iv_opmode) { 476 case IEEE80211_M_STA: 477 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 478 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 479 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 480 IEEE80211_ADDR_COPY(wh->i_addr3, da); 481 break; 482 case IEEE80211_M_IBSS: 483 case IEEE80211_M_AHDEMO: 484 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 485 IEEE80211_ADDR_COPY(wh->i_addr1, da); 486 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 487 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 488 break; 489 case IEEE80211_M_HOSTAP: 490 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 491 IEEE80211_ADDR_COPY(wh->i_addr1, da); 492 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 493 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 494 break; 495 case IEEE80211_M_WDS: 496 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 497 IEEE80211_ADDR_COPY(wh->i_addr1, da); 498 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 499 IEEE80211_ADDR_COPY(wh->i_addr3, da); 500 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 501 break; 502 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 503 break; 504 } 505 } else { 506 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 507 IEEE80211_ADDR_COPY(wh->i_addr1, da); 508 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 509 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 510 } 511 *(uint16_t *)&wh->i_dur[0] = 0; 512 513 seqno = ni->ni_txseqs[tid]++; 514 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 515 516 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 517 m->m_flags |= M_MCAST; 518#undef WH4 519} 520 521/* 522 * Send a management frame to the specified node. The node pointer 523 * must have a reference as the pointer will be passed to the driver 524 * and potentially held for a long time. If the frame is successfully 525 * dispatched to the driver, then it is responsible for freeing the 526 * reference (and potentially free'ing up any associated storage); 527 * otherwise deal with reclaiming any reference (on error). 528 */ 529int 530ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 531 struct ieee80211_bpf_params *params) 532{ 533 struct ieee80211vap *vap = ni->ni_vap; 534 struct ieee80211com *ic = ni->ni_ic; 535 struct ieee80211_frame *wh; 536 537 KASSERT(ni != NULL, ("null node")); 538 539 if (vap->iv_state == IEEE80211_S_CAC) { 540 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 541 ni, "block %s frame in CAC state", 542 ieee80211_mgt_subtype_name[ 543 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 544 IEEE80211_FC0_SUBTYPE_SHIFT]); 545 vap->iv_stats.is_tx_badstate++; 546 ieee80211_free_node(ni); 547 m_freem(m); 548 return EIO; /* XXX */ 549 } 550 551 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 552 if (m == NULL) { 553 ieee80211_free_node(ni); 554 return ENOMEM; 555 } 556 557 wh = mtod(m, struct ieee80211_frame *); 558 ieee80211_send_setup(ni, m, 559 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 560 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 561 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 562 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 563 "encrypting frame (%s)", __func__); 564 wh->i_fc[1] |= IEEE80211_FC1_WEP; 565 } 566 m->m_flags |= M_ENCAP; /* mark encapsulated */ 567 568 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 569 M_WME_SETAC(m, params->ibp_pri); 570 571#ifdef IEEE80211_DEBUG 572 /* avoid printing too many frames */ 573 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 574 ieee80211_msg_dumppkts(vap)) { 575 printf("[%s] send %s on channel %u\n", 576 ether_sprintf(wh->i_addr1), 577 ieee80211_mgt_subtype_name[ 578 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 579 IEEE80211_FC0_SUBTYPE_SHIFT], 580 ieee80211_chan2ieee(ic, ic->ic_curchan)); 581 } 582#endif 583 IEEE80211_NODE_STAT(ni, tx_mgmt); 584 585 return ic->ic_raw_xmit(ni, m, params); 586} 587 588/* 589 * Send a null data frame to the specified node. If the station 590 * is setup for QoS then a QoS Null Data frame is constructed. 591 * If this is a WDS station then a 4-address frame is constructed. 592 * 593 * NB: the caller is assumed to have setup a node reference 594 * for use; this is necessary to deal with a race condition 595 * when probing for inactive stations. Like ieee80211_mgmt_output 596 * we must cleanup any node reference on error; however we 597 * can safely just unref it as we know it will never be the 598 * last reference to the node. 599 */ 600int 601ieee80211_send_nulldata(struct ieee80211_node *ni) 602{ 603 struct ieee80211vap *vap = ni->ni_vap; 604 struct ieee80211com *ic = ni->ni_ic; 605 struct mbuf *m; 606 struct ieee80211_frame *wh; 607 int hdrlen; 608 uint8_t *frm; 609 610 if (vap->iv_state == IEEE80211_S_CAC) { 611 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 612 ni, "block %s frame in CAC state", "null data"); 613 ieee80211_unref_node(&ni); 614 vap->iv_stats.is_tx_badstate++; 615 return EIO; /* XXX */ 616 } 617 618 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 619 hdrlen = sizeof(struct ieee80211_qosframe); 620 else 621 hdrlen = sizeof(struct ieee80211_frame); 622 /* NB: only WDS vap's get 4-address frames */ 623 if (vap->iv_opmode == IEEE80211_M_WDS) 624 hdrlen += IEEE80211_ADDR_LEN; 625 if (ic->ic_flags & IEEE80211_F_DATAPAD) 626 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 627 628 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 629 if (m == NULL) { 630 /* XXX debug msg */ 631 ieee80211_unref_node(&ni); 632 vap->iv_stats.is_tx_nobuf++; 633 return ENOMEM; 634 } 635 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 636 ("leading space %zd", M_LEADINGSPACE(m))); 637 M_PREPEND(m, hdrlen, M_DONTWAIT); 638 if (m == NULL) { 639 /* NB: cannot happen */ 640 ieee80211_free_node(ni); 641 return ENOMEM; 642 } 643 644 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 645 if (ni->ni_flags & IEEE80211_NODE_QOS) { 646 const int tid = WME_AC_TO_TID(WME_AC_BE); 647 uint8_t *qos; 648 649 ieee80211_send_setup(ni, m, 650 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 651 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 652 653 if (vap->iv_opmode == IEEE80211_M_WDS) 654 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 655 else 656 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 657 qos[0] = tid & IEEE80211_QOS_TID; 658 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 659 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 660 qos[1] = 0; 661 } else { 662 ieee80211_send_setup(ni, m, 663 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 664 IEEE80211_NONQOS_TID, 665 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 666 } 667 if (vap->iv_opmode != IEEE80211_M_WDS) { 668 /* NB: power management bit is never sent by an AP */ 669 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 670 vap->iv_opmode != IEEE80211_M_HOSTAP) 671 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 672 } 673 m->m_len = m->m_pkthdr.len = hdrlen; 674 m->m_flags |= M_ENCAP; /* mark encapsulated */ 675 676 M_WME_SETAC(m, WME_AC_BE); 677 678 IEEE80211_NODE_STAT(ni, tx_data); 679 680 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 681 "send %snull data frame on channel %u, pwr mgt %s", 682 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 683 ieee80211_chan2ieee(ic, ic->ic_curchan), 684 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 685 686 return ic->ic_raw_xmit(ni, m, NULL); 687} 688 689/* 690 * Assign priority to a frame based on any vlan tag assigned 691 * to the station and/or any Diffserv setting in an IP header. 692 * Finally, if an ACM policy is setup (in station mode) it's 693 * applied. 694 */ 695int 696ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 697{ 698 const struct ether_header *eh = mtod(m, struct ether_header *); 699 int v_wme_ac, d_wme_ac, ac; 700 701 /* 702 * Always promote PAE/EAPOL frames to high priority. 703 */ 704 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 705 /* NB: mark so others don't need to check header */ 706 m->m_flags |= M_EAPOL; 707 ac = WME_AC_VO; 708 goto done; 709 } 710 /* 711 * Non-qos traffic goes to BE. 712 */ 713 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 714 ac = WME_AC_BE; 715 goto done; 716 } 717 718 /* 719 * If node has a vlan tag then all traffic 720 * to it must have a matching tag. 721 */ 722 v_wme_ac = 0; 723 if (ni->ni_vlan != 0) { 724 if ((m->m_flags & M_VLANTAG) == 0) { 725 IEEE80211_NODE_STAT(ni, tx_novlantag); 726 return 1; 727 } 728 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 729 EVL_VLANOFTAG(ni->ni_vlan)) { 730 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 731 return 1; 732 } 733 /* map vlan priority to AC */ 734 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 735 } 736 737#ifdef INET 738 if (eh->ether_type == htons(ETHERTYPE_IP)) { 739 uint8_t tos; 740 /* 741 * IP frame, map the DSCP bits from the TOS field. 742 */ 743 /* XXX m_copydata may be too slow for fast path */ 744 /* NB: ip header may not be in first mbuf */ 745 m_copydata(m, sizeof(struct ether_header) + 746 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 747 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 748 d_wme_ac = TID_TO_WME_AC(tos); 749 } else { 750#endif /* INET */ 751 d_wme_ac = WME_AC_BE; 752#ifdef INET 753 } 754#endif 755 /* 756 * Use highest priority AC. 757 */ 758 if (v_wme_ac > d_wme_ac) 759 ac = v_wme_ac; 760 else 761 ac = d_wme_ac; 762 763 /* 764 * Apply ACM policy. 765 */ 766 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 767 static const int acmap[4] = { 768 WME_AC_BK, /* WME_AC_BE */ 769 WME_AC_BK, /* WME_AC_BK */ 770 WME_AC_BE, /* WME_AC_VI */ 771 WME_AC_VI, /* WME_AC_VO */ 772 }; 773 struct ieee80211com *ic = ni->ni_ic; 774 775 while (ac != WME_AC_BK && 776 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 777 ac = acmap[ac]; 778 } 779done: 780 M_WME_SETAC(m, ac); 781 return 0; 782} 783 784/* 785 * Insure there is sufficient contiguous space to encapsulate the 786 * 802.11 data frame. If room isn't already there, arrange for it. 787 * Drivers and cipher modules assume we have done the necessary work 788 * and fail rudely if they don't find the space they need. 789 */ 790struct mbuf * 791ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 792 struct ieee80211_key *key, struct mbuf *m) 793{ 794#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 795 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 796 797 if (key != NULL) { 798 /* XXX belongs in crypto code? */ 799 needed_space += key->wk_cipher->ic_header; 800 /* XXX frags */ 801 /* 802 * When crypto is being done in the host we must insure 803 * the data are writable for the cipher routines; clone 804 * a writable mbuf chain. 805 * XXX handle SWMIC specially 806 */ 807 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 808 m = m_unshare(m, M_NOWAIT); 809 if (m == NULL) { 810 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 811 "%s: cannot get writable mbuf\n", __func__); 812 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 813 return NULL; 814 } 815 } 816 } 817 /* 818 * We know we are called just before stripping an Ethernet 819 * header and prepending an LLC header. This means we know 820 * there will be 821 * sizeof(struct ether_header) - sizeof(struct llc) 822 * bytes recovered to which we need additional space for the 823 * 802.11 header and any crypto header. 824 */ 825 /* XXX check trailing space and copy instead? */ 826 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 827 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 828 if (n == NULL) { 829 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 830 "%s: cannot expand storage\n", __func__); 831 vap->iv_stats.is_tx_nobuf++; 832 m_freem(m); 833 return NULL; 834 } 835 KASSERT(needed_space <= MHLEN, 836 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 837 /* 838 * Setup new mbuf to have leading space to prepend the 839 * 802.11 header and any crypto header bits that are 840 * required (the latter are added when the driver calls 841 * back to ieee80211_crypto_encap to do crypto encapsulation). 842 */ 843 /* NB: must be first 'cuz it clobbers m_data */ 844 m_move_pkthdr(n, m); 845 n->m_len = 0; /* NB: m_gethdr does not set */ 846 n->m_data += needed_space; 847 /* 848 * Pull up Ethernet header to create the expected layout. 849 * We could use m_pullup but that's overkill (i.e. we don't 850 * need the actual data) and it cannot fail so do it inline 851 * for speed. 852 */ 853 /* NB: struct ether_header is known to be contiguous */ 854 n->m_len += sizeof(struct ether_header); 855 m->m_len -= sizeof(struct ether_header); 856 m->m_data += sizeof(struct ether_header); 857 /* 858 * Replace the head of the chain. 859 */ 860 n->m_next = m; 861 m = n; 862 } 863 return m; 864#undef TO_BE_RECLAIMED 865} 866 867/* 868 * Return the transmit key to use in sending a unicast frame. 869 * If a unicast key is set we use that. When no unicast key is set 870 * we fall back to the default transmit key. 871 */ 872static __inline struct ieee80211_key * 873ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 874 struct ieee80211_node *ni) 875{ 876 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 877 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 878 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 879 return NULL; 880 return &vap->iv_nw_keys[vap->iv_def_txkey]; 881 } else { 882 return &ni->ni_ucastkey; 883 } 884} 885 886/* 887 * Return the transmit key to use in sending a multicast frame. 888 * Multicast traffic always uses the group key which is installed as 889 * the default tx key. 890 */ 891static __inline struct ieee80211_key * 892ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 893 struct ieee80211_node *ni) 894{ 895 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 896 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 897 return NULL; 898 return &vap->iv_nw_keys[vap->iv_def_txkey]; 899} 900 901/* 902 * Encapsulate an outbound data frame. The mbuf chain is updated. 903 * If an error is encountered NULL is returned. The caller is required 904 * to provide a node reference and pullup the ethernet header in the 905 * first mbuf. 906 * 907 * NB: Packet is assumed to be processed by ieee80211_classify which 908 * marked EAPOL frames w/ M_EAPOL. 909 */ 910struct mbuf * 911ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 912 struct mbuf *m) 913{ 914#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 915 struct ieee80211com *ic = ni->ni_ic; 916 struct ether_header eh; 917 struct ieee80211_frame *wh; 918 struct ieee80211_key *key; 919 struct llc *llc; 920 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 921 ieee80211_seq seqno; 922 923 /* 924 * Copy existing Ethernet header to a safe place. The 925 * rest of the code assumes it's ok to strip it when 926 * reorganizing state for the final encapsulation. 927 */ 928 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 929 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 930 931 /* 932 * Insure space for additional headers. First identify 933 * transmit key to use in calculating any buffer adjustments 934 * required. This is also used below to do privacy 935 * encapsulation work. Then calculate the 802.11 header 936 * size and any padding required by the driver. 937 * 938 * Note key may be NULL if we fall back to the default 939 * transmit key and that is not set. In that case the 940 * buffer may not be expanded as needed by the cipher 941 * routines, but they will/should discard it. 942 */ 943 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 944 if (vap->iv_opmode == IEEE80211_M_STA || 945 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 946 (vap->iv_opmode == IEEE80211_M_WDS && 947 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 948 key = ieee80211_crypto_getucastkey(vap, ni); 949 else 950 key = ieee80211_crypto_getmcastkey(vap, ni); 951 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 952 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 953 eh.ether_dhost, 954 "no default transmit key (%s) deftxkey %u", 955 __func__, vap->iv_def_txkey); 956 vap->iv_stats.is_tx_nodefkey++; 957 goto bad; 958 } 959 } else 960 key = NULL; 961 /* 962 * XXX Some ap's don't handle QoS-encapsulated EAPOL 963 * frames so suppress use. This may be an issue if other 964 * ap's require all data frames to be QoS-encapsulated 965 * once negotiated in which case we'll need to make this 966 * configurable. 967 */ 968 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 969 (m->m_flags & M_EAPOL) == 0; 970 if (addqos) 971 hdrsize = sizeof(struct ieee80211_qosframe); 972 else 973 hdrsize = sizeof(struct ieee80211_frame); 974 /* 975 * 4-address frames need to be generated for: 976 * o packets sent through a WDS vap (IEEE80211_M_WDS) 977 * o packets relayed by a station operating with dynamic WDS 978 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 979 */ 980 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 981 (vap->iv_opmode == IEEE80211_M_STA && 982 (vap->iv_flags & IEEE80211_F_DWDS) && 983 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 984 if (is4addr) 985 hdrsize += IEEE80211_ADDR_LEN; 986 /* 987 * Honor driver DATAPAD requirement. 988 */ 989 if (ic->ic_flags & IEEE80211_F_DATAPAD) 990 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 991 else 992 hdrspace = hdrsize; 993 994 if (__predict_true((m->m_flags & M_FF) == 0)) { 995 /* 996 * Normal frame. 997 */ 998 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 999 if (m == NULL) { 1000 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1001 goto bad; 1002 } 1003 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1004 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1005 llc = mtod(m, struct llc *); 1006 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1007 llc->llc_control = LLC_UI; 1008 llc->llc_snap.org_code[0] = 0; 1009 llc->llc_snap.org_code[1] = 0; 1010 llc->llc_snap.org_code[2] = 0; 1011 llc->llc_snap.ether_type = eh.ether_type; 1012 } else { 1013#ifdef IEEE80211_SUPPORT_SUPERG 1014 /* 1015 * Aggregated frame. 1016 */ 1017 m = ieee80211_ff_encap(vap, m, hdrspace, key); 1018 if (m == NULL) 1019#endif 1020 goto bad; 1021 } 1022 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1023 1024 M_PREPEND(m, hdrspace, M_DONTWAIT); 1025 if (m == NULL) { 1026 vap->iv_stats.is_tx_nobuf++; 1027 goto bad; 1028 } 1029 wh = mtod(m, struct ieee80211_frame *); 1030 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1031 *(uint16_t *)wh->i_dur = 0; 1032 if (is4addr) { 1033 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1034 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1035 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1036 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1037 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1038 } else switch (vap->iv_opmode) { 1039 case IEEE80211_M_STA: 1040 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1041 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1042 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1043 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1044 break; 1045 case IEEE80211_M_IBSS: 1046 case IEEE80211_M_AHDEMO: 1047 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1048 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1049 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1050 /* 1051 * NB: always use the bssid from iv_bss as the 1052 * neighbor's may be stale after an ibss merge 1053 */ 1054 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1055 break; 1056 case IEEE80211_M_HOSTAP: 1057 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1058 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1059 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1060 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1061 break; 1062 case IEEE80211_M_MONITOR: 1063 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1064 goto bad; 1065 } 1066 if (m->m_flags & M_MORE_DATA) 1067 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1068 if (addqos) { 1069 uint8_t *qos; 1070 int ac, tid; 1071 1072 if (is4addr) { 1073 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1074 } else 1075 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1076 ac = M_WME_GETAC(m); 1077 /* map from access class/queue to 11e header priorty value */ 1078 tid = WME_AC_TO_TID(ac); 1079 qos[0] = tid & IEEE80211_QOS_TID; 1080 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1081 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1082 qos[1] = 0; 1083 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1084 1085 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1086 /* 1087 * NB: don't assign a sequence # to potential 1088 * aggregates; we expect this happens at the 1089 * point the frame comes off any aggregation q 1090 * as otherwise we may introduce holes in the 1091 * BA sequence space and/or make window accouting 1092 * more difficult. 1093 * 1094 * XXX may want to control this with a driver 1095 * capability; this may also change when we pull 1096 * aggregation up into net80211 1097 */ 1098 seqno = ni->ni_txseqs[tid]++; 1099 *(uint16_t *)wh->i_seq = 1100 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1101 } 1102 } else { 1103 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1104 *(uint16_t *)wh->i_seq = 1105 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1106 } 1107 /* check if xmit fragmentation is required */ 1108 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1109 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1110 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1111 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1112 if (key != NULL) { 1113 /* 1114 * IEEE 802.1X: send EAPOL frames always in the clear. 1115 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1116 */ 1117 if ((m->m_flags & M_EAPOL) == 0 || 1118 ((vap->iv_flags & IEEE80211_F_WPA) && 1119 (vap->iv_opmode == IEEE80211_M_STA ? 1120 !IEEE80211_KEY_UNDEFINED(key) : 1121 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1122 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1123 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1124 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1125 eh.ether_dhost, 1126 "%s", "enmic failed, discard frame"); 1127 vap->iv_stats.is_crypto_enmicfail++; 1128 goto bad; 1129 } 1130 } 1131 } 1132 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1133 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1134 goto bad; 1135 1136 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1137 1138 IEEE80211_NODE_STAT(ni, tx_data); 1139 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1140 IEEE80211_NODE_STAT(ni, tx_mcast); 1141 m->m_flags |= M_MCAST; 1142 } else 1143 IEEE80211_NODE_STAT(ni, tx_ucast); 1144 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1145 1146 return m; 1147bad: 1148 if (m != NULL) 1149 m_freem(m); 1150 return NULL; 1151#undef WH4 1152} 1153 1154/* 1155 * Fragment the frame according to the specified mtu. 1156 * The size of the 802.11 header (w/o padding) is provided 1157 * so we don't need to recalculate it. We create a new 1158 * mbuf for each fragment and chain it through m_nextpkt; 1159 * we might be able to optimize this by reusing the original 1160 * packet's mbufs but that is significantly more complicated. 1161 */ 1162static int 1163ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1164 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1165{ 1166 struct ieee80211_frame *wh, *whf; 1167 struct mbuf *m, *prev, *next; 1168 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1169 1170 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1171 KASSERT(m0->m_pkthdr.len > mtu, 1172 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1173 1174 wh = mtod(m0, struct ieee80211_frame *); 1175 /* NB: mark the first frag; it will be propagated below */ 1176 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1177 totalhdrsize = hdrsize + ciphdrsize; 1178 fragno = 1; 1179 off = mtu - ciphdrsize; 1180 remainder = m0->m_pkthdr.len - off; 1181 prev = m0; 1182 do { 1183 fragsize = totalhdrsize + remainder; 1184 if (fragsize > mtu) 1185 fragsize = mtu; 1186 /* XXX fragsize can be >2048! */ 1187 KASSERT(fragsize < MCLBYTES, 1188 ("fragment size %u too big!", fragsize)); 1189 if (fragsize > MHLEN) 1190 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1191 else 1192 m = m_gethdr(M_DONTWAIT, MT_DATA); 1193 if (m == NULL) 1194 goto bad; 1195 /* leave room to prepend any cipher header */ 1196 m_align(m, fragsize - ciphdrsize); 1197 1198 /* 1199 * Form the header in the fragment. Note that since 1200 * we mark the first fragment with the MORE_FRAG bit 1201 * it automatically is propagated to each fragment; we 1202 * need only clear it on the last fragment (done below). 1203 */ 1204 whf = mtod(m, struct ieee80211_frame *); 1205 memcpy(whf, wh, hdrsize); 1206 *(uint16_t *)&whf->i_seq[0] |= htole16( 1207 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1208 IEEE80211_SEQ_FRAG_SHIFT); 1209 fragno++; 1210 1211 payload = fragsize - totalhdrsize; 1212 /* NB: destination is known to be contiguous */ 1213 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1214 m->m_len = hdrsize + payload; 1215 m->m_pkthdr.len = hdrsize + payload; 1216 m->m_flags |= M_FRAG; 1217 1218 /* chain up the fragment */ 1219 prev->m_nextpkt = m; 1220 prev = m; 1221 1222 /* deduct fragment just formed */ 1223 remainder -= payload; 1224 off += payload; 1225 } while (remainder != 0); 1226 1227 /* set the last fragment */ 1228 m->m_flags |= M_LASTFRAG; 1229 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1230 1231 /* strip first mbuf now that everything has been copied */ 1232 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1233 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1234 1235 vap->iv_stats.is_tx_fragframes++; 1236 vap->iv_stats.is_tx_frags += fragno-1; 1237 1238 return 1; 1239bad: 1240 /* reclaim fragments but leave original frame for caller to free */ 1241 for (m = m0->m_nextpkt; m != NULL; m = next) { 1242 next = m->m_nextpkt; 1243 m->m_nextpkt = NULL; /* XXX paranoid */ 1244 m_freem(m); 1245 } 1246 m0->m_nextpkt = NULL; 1247 return 0; 1248} 1249 1250/* 1251 * Add a supported rates element id to a frame. 1252 */ 1253static uint8_t * 1254ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1255{ 1256 int nrates; 1257 1258 *frm++ = IEEE80211_ELEMID_RATES; 1259 nrates = rs->rs_nrates; 1260 if (nrates > IEEE80211_RATE_SIZE) 1261 nrates = IEEE80211_RATE_SIZE; 1262 *frm++ = nrates; 1263 memcpy(frm, rs->rs_rates, nrates); 1264 return frm + nrates; 1265} 1266 1267/* 1268 * Add an extended supported rates element id to a frame. 1269 */ 1270static uint8_t * 1271ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1272{ 1273 /* 1274 * Add an extended supported rates element if operating in 11g mode. 1275 */ 1276 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1277 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1278 *frm++ = IEEE80211_ELEMID_XRATES; 1279 *frm++ = nrates; 1280 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1281 frm += nrates; 1282 } 1283 return frm; 1284} 1285 1286/* 1287 * Add an ssid element to a frame. 1288 */ 1289static uint8_t * 1290ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1291{ 1292 *frm++ = IEEE80211_ELEMID_SSID; 1293 *frm++ = len; 1294 memcpy(frm, ssid, len); 1295 return frm + len; 1296} 1297 1298/* 1299 * Add an erp element to a frame. 1300 */ 1301static uint8_t * 1302ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1303{ 1304 uint8_t erp; 1305 1306 *frm++ = IEEE80211_ELEMID_ERP; 1307 *frm++ = 1; 1308 erp = 0; 1309 if (ic->ic_nonerpsta != 0) 1310 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1311 if (ic->ic_flags & IEEE80211_F_USEPROT) 1312 erp |= IEEE80211_ERP_USE_PROTECTION; 1313 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1314 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1315 *frm++ = erp; 1316 return frm; 1317} 1318 1319/* 1320 * Add a CFParams element to a frame. 1321 */ 1322static uint8_t * 1323ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1324{ 1325#define ADDSHORT(frm, v) do { \ 1326 frm[0] = (v) & 0xff; \ 1327 frm[1] = (v) >> 8; \ 1328 frm += 2; \ 1329} while (0) 1330 *frm++ = IEEE80211_ELEMID_CFPARMS; 1331 *frm++ = 6; 1332 *frm++ = 0; /* CFP count */ 1333 *frm++ = 2; /* CFP period */ 1334 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1335 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1336 return frm; 1337#undef ADDSHORT 1338} 1339 1340static __inline uint8_t * 1341add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1342{ 1343 memcpy(frm, ie->ie_data, ie->ie_len); 1344 return frm + ie->ie_len; 1345} 1346 1347static __inline uint8_t * 1348add_ie(uint8_t *frm, const uint8_t *ie) 1349{ 1350 memcpy(frm, ie, 2 + ie[1]); 1351 return frm + 2 + ie[1]; 1352} 1353 1354#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1355/* 1356 * Add a WME information element to a frame. 1357 */ 1358static uint8_t * 1359ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1360{ 1361 static const struct ieee80211_wme_info info = { 1362 .wme_id = IEEE80211_ELEMID_VENDOR, 1363 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1364 .wme_oui = { WME_OUI_BYTES }, 1365 .wme_type = WME_OUI_TYPE, 1366 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1367 .wme_version = WME_VERSION, 1368 .wme_info = 0, 1369 }; 1370 memcpy(frm, &info, sizeof(info)); 1371 return frm + sizeof(info); 1372} 1373 1374/* 1375 * Add a WME parameters element to a frame. 1376 */ 1377static uint8_t * 1378ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1379{ 1380#define SM(_v, _f) (((_v) << _f##_S) & _f) 1381#define ADDSHORT(frm, v) do { \ 1382 frm[0] = (v) & 0xff; \ 1383 frm[1] = (v) >> 8; \ 1384 frm += 2; \ 1385} while (0) 1386 /* NB: this works 'cuz a param has an info at the front */ 1387 static const struct ieee80211_wme_info param = { 1388 .wme_id = IEEE80211_ELEMID_VENDOR, 1389 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1390 .wme_oui = { WME_OUI_BYTES }, 1391 .wme_type = WME_OUI_TYPE, 1392 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1393 .wme_version = WME_VERSION, 1394 }; 1395 int i; 1396 1397 memcpy(frm, ¶m, sizeof(param)); 1398 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1399 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1400 *frm++ = 0; /* reserved field */ 1401 for (i = 0; i < WME_NUM_AC; i++) { 1402 const struct wmeParams *ac = 1403 &wme->wme_bssChanParams.cap_wmeParams[i]; 1404 *frm++ = SM(i, WME_PARAM_ACI) 1405 | SM(ac->wmep_acm, WME_PARAM_ACM) 1406 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1407 ; 1408 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1409 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1410 ; 1411 ADDSHORT(frm, ac->wmep_txopLimit); 1412 } 1413 return frm; 1414#undef SM 1415#undef ADDSHORT 1416} 1417#undef WME_OUI_BYTES 1418 1419/* 1420 * Add an 11h Power Constraint element to a frame. 1421 */ 1422static uint8_t * 1423ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1424{ 1425 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1426 /* XXX per-vap tx power limit? */ 1427 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1428 1429 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1430 frm[1] = 1; 1431 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1432 return frm + 3; 1433} 1434 1435/* 1436 * Add an 11h Power Capability element to a frame. 1437 */ 1438static uint8_t * 1439ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1440{ 1441 frm[0] = IEEE80211_ELEMID_PWRCAP; 1442 frm[1] = 2; 1443 frm[2] = c->ic_minpower; 1444 frm[3] = c->ic_maxpower; 1445 return frm + 4; 1446} 1447 1448/* 1449 * Add an 11h Supported Channels element to a frame. 1450 */ 1451static uint8_t * 1452ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1453{ 1454 static const int ielen = 26; 1455 1456 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1457 frm[1] = ielen; 1458 /* XXX not correct */ 1459 memcpy(frm+2, ic->ic_chan_avail, ielen); 1460 return frm + 2 + ielen; 1461} 1462 1463/* 1464 * Add an 11h Channel Switch Announcement element to a frame. 1465 * Note that we use the per-vap CSA count to adjust the global 1466 * counter so we can use this routine to form probe response 1467 * frames and get the current count. 1468 */ 1469static uint8_t * 1470ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1471{ 1472 struct ieee80211com *ic = vap->iv_ic; 1473 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1474 1475 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1476 csa->csa_len = 3; 1477 csa->csa_mode = 1; /* XXX force quiet on channel */ 1478 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1479 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1480 return frm + sizeof(*csa); 1481} 1482 1483/* 1484 * Add an 11h country information element to a frame. 1485 */ 1486static uint8_t * 1487ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1488{ 1489 1490 if (ic->ic_countryie == NULL || 1491 ic->ic_countryie_chan != ic->ic_bsschan) { 1492 /* 1493 * Handle lazy construction of ie. This is done on 1494 * first use and after a channel change that requires 1495 * re-calculation. 1496 */ 1497 if (ic->ic_countryie != NULL) 1498 free(ic->ic_countryie, M_80211_NODE_IE); 1499 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1500 if (ic->ic_countryie == NULL) 1501 return frm; 1502 ic->ic_countryie_chan = ic->ic_bsschan; 1503 } 1504 return add_appie(frm, ic->ic_countryie); 1505} 1506 1507/* 1508 * Send a probe request frame with the specified ssid 1509 * and any optional information element data. 1510 */ 1511int 1512ieee80211_send_probereq(struct ieee80211_node *ni, 1513 const uint8_t sa[IEEE80211_ADDR_LEN], 1514 const uint8_t da[IEEE80211_ADDR_LEN], 1515 const uint8_t bssid[IEEE80211_ADDR_LEN], 1516 const uint8_t *ssid, size_t ssidlen) 1517{ 1518 struct ieee80211vap *vap = ni->ni_vap; 1519 struct ieee80211com *ic = ni->ni_ic; 1520 const struct ieee80211_txparam *tp; 1521 struct ieee80211_bpf_params params; 1522 struct ieee80211_frame *wh; 1523 const struct ieee80211_rateset *rs; 1524 struct mbuf *m; 1525 uint8_t *frm; 1526 1527 if (vap->iv_state == IEEE80211_S_CAC) { 1528 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1529 "block %s frame in CAC state", "probe request"); 1530 vap->iv_stats.is_tx_badstate++; 1531 return EIO; /* XXX */ 1532 } 1533 1534 /* 1535 * Hold a reference on the node so it doesn't go away until after 1536 * the xmit is complete all the way in the driver. On error we 1537 * will remove our reference. 1538 */ 1539 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1540 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1541 __func__, __LINE__, 1542 ni, ether_sprintf(ni->ni_macaddr), 1543 ieee80211_node_refcnt(ni)+1); 1544 ieee80211_ref_node(ni); 1545 1546 /* 1547 * prreq frame format 1548 * [tlv] ssid 1549 * [tlv] supported rates 1550 * [tlv] RSN (optional) 1551 * [tlv] extended supported rates 1552 * [tlv] WPA (optional) 1553 * [tlv] user-specified ie's 1554 */ 1555 m = ieee80211_getmgtframe(&frm, 1556 ic->ic_headroom + sizeof(struct ieee80211_frame), 1557 2 + IEEE80211_NWID_LEN 1558 + 2 + IEEE80211_RATE_SIZE 1559 + sizeof(struct ieee80211_ie_wpa) 1560 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1561 + sizeof(struct ieee80211_ie_wpa) 1562 + (vap->iv_appie_probereq != NULL ? 1563 vap->iv_appie_probereq->ie_len : 0) 1564 ); 1565 if (m == NULL) { 1566 vap->iv_stats.is_tx_nobuf++; 1567 ieee80211_free_node(ni); 1568 return ENOMEM; 1569 } 1570 1571 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1572 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1573 frm = ieee80211_add_rates(frm, rs); 1574 if (vap->iv_flags & IEEE80211_F_WPA2) { 1575 if (vap->iv_rsn_ie != NULL) 1576 frm = add_ie(frm, vap->iv_rsn_ie); 1577 /* XXX else complain? */ 1578 } 1579 frm = ieee80211_add_xrates(frm, rs); 1580 if (vap->iv_flags & IEEE80211_F_WPA1) { 1581 if (vap->iv_wpa_ie != NULL) 1582 frm = add_ie(frm, vap->iv_wpa_ie); 1583 /* XXX else complain? */ 1584 } 1585 if (vap->iv_appie_probereq != NULL) 1586 frm = add_appie(frm, vap->iv_appie_probereq); 1587 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1588 1589 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1590 ("leading space %zd", M_LEADINGSPACE(m))); 1591 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1592 if (m == NULL) { 1593 /* NB: cannot happen */ 1594 ieee80211_free_node(ni); 1595 return ENOMEM; 1596 } 1597 1598 wh = mtod(m, struct ieee80211_frame *); 1599 ieee80211_send_setup(ni, m, 1600 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1601 IEEE80211_NONQOS_TID, sa, da, bssid); 1602 /* XXX power management? */ 1603 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1604 1605 M_WME_SETAC(m, WME_AC_BE); 1606 1607 IEEE80211_NODE_STAT(ni, tx_probereq); 1608 IEEE80211_NODE_STAT(ni, tx_mgmt); 1609 1610 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1611 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1612 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1613 ssidlen, ssid); 1614 1615 memset(¶ms, 0, sizeof(params)); 1616 params.ibp_pri = M_WME_GETAC(m); 1617 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1618 params.ibp_rate0 = tp->mgmtrate; 1619 if (IEEE80211_IS_MULTICAST(da)) { 1620 params.ibp_flags |= IEEE80211_BPF_NOACK; 1621 params.ibp_try0 = 1; 1622 } else 1623 params.ibp_try0 = tp->maxretry; 1624 params.ibp_power = ni->ni_txpower; 1625 return ic->ic_raw_xmit(ni, m, ¶ms); 1626} 1627 1628/* 1629 * Calculate capability information for mgt frames. 1630 */ 1631static uint16_t 1632getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1633{ 1634 struct ieee80211com *ic = vap->iv_ic; 1635 uint16_t capinfo; 1636 1637 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1638 1639 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1640 capinfo = IEEE80211_CAPINFO_ESS; 1641 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1642 capinfo = IEEE80211_CAPINFO_IBSS; 1643 else 1644 capinfo = 0; 1645 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1646 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1647 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1648 IEEE80211_IS_CHAN_2GHZ(chan)) 1649 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1650 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1651 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1652 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1653 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1654 return capinfo; 1655} 1656 1657/* 1658 * Send a management frame. The node is for the destination (or ic_bss 1659 * when in station mode). Nodes other than ic_bss have their reference 1660 * count bumped to reflect our use for an indeterminant time. 1661 */ 1662int 1663ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1664{ 1665#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1666#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1667 struct ieee80211vap *vap = ni->ni_vap; 1668 struct ieee80211com *ic = ni->ni_ic; 1669 struct ieee80211_node *bss = vap->iv_bss; 1670 struct ieee80211_bpf_params params; 1671 struct mbuf *m; 1672 uint8_t *frm; 1673 uint16_t capinfo; 1674 int has_challenge, is_shared_key, ret, status; 1675 1676 KASSERT(ni != NULL, ("null node")); 1677 1678 /* 1679 * Hold a reference on the node so it doesn't go away until after 1680 * the xmit is complete all the way in the driver. On error we 1681 * will remove our reference. 1682 */ 1683 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1684 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1685 __func__, __LINE__, 1686 ni, ether_sprintf(ni->ni_macaddr), 1687 ieee80211_node_refcnt(ni)+1); 1688 ieee80211_ref_node(ni); 1689 1690 memset(¶ms, 0, sizeof(params)); 1691 switch (type) { 1692 1693 case IEEE80211_FC0_SUBTYPE_AUTH: 1694 status = arg >> 16; 1695 arg &= 0xffff; 1696 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1697 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1698 ni->ni_challenge != NULL); 1699 1700 /* 1701 * Deduce whether we're doing open authentication or 1702 * shared key authentication. We do the latter if 1703 * we're in the middle of a shared key authentication 1704 * handshake or if we're initiating an authentication 1705 * request and configured to use shared key. 1706 */ 1707 is_shared_key = has_challenge || 1708 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1709 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1710 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1711 1712 m = ieee80211_getmgtframe(&frm, 1713 ic->ic_headroom + sizeof(struct ieee80211_frame), 1714 3 * sizeof(uint16_t) 1715 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1716 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1717 ); 1718 if (m == NULL) 1719 senderr(ENOMEM, is_tx_nobuf); 1720 1721 ((uint16_t *)frm)[0] = 1722 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1723 : htole16(IEEE80211_AUTH_ALG_OPEN); 1724 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1725 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1726 1727 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1728 ((uint16_t *)frm)[3] = 1729 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1730 IEEE80211_ELEMID_CHALLENGE); 1731 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1732 IEEE80211_CHALLENGE_LEN); 1733 m->m_pkthdr.len = m->m_len = 1734 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1735 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1736 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1737 "request encrypt frame (%s)", __func__); 1738 /* mark frame for encryption */ 1739 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1740 } 1741 } else 1742 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1743 1744 /* XXX not right for shared key */ 1745 if (status == IEEE80211_STATUS_SUCCESS) 1746 IEEE80211_NODE_STAT(ni, tx_auth); 1747 else 1748 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1749 1750 if (vap->iv_opmode == IEEE80211_M_STA) 1751 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1752 (void *) vap->iv_state); 1753 break; 1754 1755 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1756 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1757 "send station deauthenticate (reason %d)", arg); 1758 m = ieee80211_getmgtframe(&frm, 1759 ic->ic_headroom + sizeof(struct ieee80211_frame), 1760 sizeof(uint16_t)); 1761 if (m == NULL) 1762 senderr(ENOMEM, is_tx_nobuf); 1763 *(uint16_t *)frm = htole16(arg); /* reason */ 1764 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1765 1766 IEEE80211_NODE_STAT(ni, tx_deauth); 1767 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1768 1769 ieee80211_node_unauthorize(ni); /* port closed */ 1770 break; 1771 1772 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1773 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1774 /* 1775 * asreq frame format 1776 * [2] capability information 1777 * [2] listen interval 1778 * [6*] current AP address (reassoc only) 1779 * [tlv] ssid 1780 * [tlv] supported rates 1781 * [tlv] extended supported rates 1782 * [4] power capability (optional) 1783 * [28] supported channels (optional) 1784 * [tlv] HT capabilities 1785 * [tlv] WME (optional) 1786 * [tlv] Vendor OUI HT capabilities (optional) 1787 * [tlv] Atheros capabilities (if negotiated) 1788 * [tlv] AppIE's (optional) 1789 */ 1790 m = ieee80211_getmgtframe(&frm, 1791 ic->ic_headroom + sizeof(struct ieee80211_frame), 1792 sizeof(uint16_t) 1793 + sizeof(uint16_t) 1794 + IEEE80211_ADDR_LEN 1795 + 2 + IEEE80211_NWID_LEN 1796 + 2 + IEEE80211_RATE_SIZE 1797 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1798 + 4 1799 + 2 + 26 1800 + sizeof(struct ieee80211_wme_info) 1801 + sizeof(struct ieee80211_ie_htcap) 1802 + 4 + sizeof(struct ieee80211_ie_htcap) 1803#ifdef IEEE80211_SUPPORT_SUPERG 1804 + sizeof(struct ieee80211_ath_ie) 1805#endif 1806 + (vap->iv_appie_wpa != NULL ? 1807 vap->iv_appie_wpa->ie_len : 0) 1808 + (vap->iv_appie_assocreq != NULL ? 1809 vap->iv_appie_assocreq->ie_len : 0) 1810 ); 1811 if (m == NULL) 1812 senderr(ENOMEM, is_tx_nobuf); 1813 1814 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1815 ("wrong mode %u", vap->iv_opmode)); 1816 capinfo = IEEE80211_CAPINFO_ESS; 1817 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1818 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1819 /* 1820 * NB: Some 11a AP's reject the request when 1821 * short premable is set. 1822 */ 1823 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1824 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1825 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1826 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1827 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1828 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1829 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1830 (vap->iv_flags & IEEE80211_F_DOTH)) 1831 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1832 *(uint16_t *)frm = htole16(capinfo); 1833 frm += 2; 1834 1835 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1836 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1837 bss->ni_intval)); 1838 frm += 2; 1839 1840 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1841 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1842 frm += IEEE80211_ADDR_LEN; 1843 } 1844 1845 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1846 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1847 if (vap->iv_flags & IEEE80211_F_WPA2) { 1848 if (vap->iv_rsn_ie != NULL) 1849 frm = add_ie(frm, vap->iv_rsn_ie); 1850 /* XXX else complain? */ 1851 } 1852 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1853 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1854 frm = ieee80211_add_powercapability(frm, 1855 ic->ic_curchan); 1856 frm = ieee80211_add_supportedchannels(frm, ic); 1857 } 1858 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1859 ni->ni_ies.htcap_ie != NULL && 1860 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1861 frm = ieee80211_add_htcap(frm, ni); 1862 if (vap->iv_flags & IEEE80211_F_WPA1) { 1863 if (vap->iv_wpa_ie != NULL) 1864 frm = add_ie(frm, vap->iv_wpa_ie); 1865 /* XXX else complain */ 1866 } 1867 if ((ic->ic_flags & IEEE80211_F_WME) && 1868 ni->ni_ies.wme_ie != NULL) 1869 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1870 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1871 ni->ni_ies.htcap_ie != NULL && 1872 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1873 frm = ieee80211_add_htcap_vendor(frm, ni); 1874#ifdef IEEE80211_SUPPORT_SUPERG 1875 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1876 frm = ieee80211_add_ath(frm, 1877 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1878 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1879 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1880 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1881 } 1882#endif /* IEEE80211_SUPPORT_SUPERG */ 1883 if (vap->iv_appie_assocreq != NULL) 1884 frm = add_appie(frm, vap->iv_appie_assocreq); 1885 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1886 1887 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1888 (void *) vap->iv_state); 1889 break; 1890 1891 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1892 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1893 /* 1894 * asresp frame format 1895 * [2] capability information 1896 * [2] status 1897 * [2] association ID 1898 * [tlv] supported rates 1899 * [tlv] extended supported rates 1900 * [tlv] HT capabilities (standard, if STA enabled) 1901 * [tlv] HT information (standard, if STA enabled) 1902 * [tlv] WME (if configured and STA enabled) 1903 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1904 * [tlv] HT information (vendor OUI, if STA enabled) 1905 * [tlv] Atheros capabilities (if STA enabled) 1906 * [tlv] AppIE's (optional) 1907 */ 1908 m = ieee80211_getmgtframe(&frm, 1909 ic->ic_headroom + sizeof(struct ieee80211_frame), 1910 sizeof(uint16_t) 1911 + sizeof(uint16_t) 1912 + sizeof(uint16_t) 1913 + 2 + IEEE80211_RATE_SIZE 1914 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1915 + sizeof(struct ieee80211_ie_htcap) + 4 1916 + sizeof(struct ieee80211_ie_htinfo) + 4 1917 + sizeof(struct ieee80211_wme_param) 1918#ifdef IEEE80211_SUPPORT_SUPERG 1919 + sizeof(struct ieee80211_ath_ie) 1920#endif 1921 + (vap->iv_appie_assocresp != NULL ? 1922 vap->iv_appie_assocresp->ie_len : 0) 1923 ); 1924 if (m == NULL) 1925 senderr(ENOMEM, is_tx_nobuf); 1926 1927 capinfo = getcapinfo(vap, bss->ni_chan); 1928 *(uint16_t *)frm = htole16(capinfo); 1929 frm += 2; 1930 1931 *(uint16_t *)frm = htole16(arg); /* status */ 1932 frm += 2; 1933 1934 if (arg == IEEE80211_STATUS_SUCCESS) { 1935 *(uint16_t *)frm = htole16(ni->ni_associd); 1936 IEEE80211_NODE_STAT(ni, tx_assoc); 1937 } else 1938 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1939 frm += 2; 1940 1941 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1942 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1943 /* NB: respond according to what we received */ 1944 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1945 frm = ieee80211_add_htcap(frm, ni); 1946 frm = ieee80211_add_htinfo(frm, ni); 1947 } 1948 if ((vap->iv_flags & IEEE80211_F_WME) && 1949 ni->ni_ies.wme_ie != NULL) 1950 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1951 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1952 frm = ieee80211_add_htcap_vendor(frm, ni); 1953 frm = ieee80211_add_htinfo_vendor(frm, ni); 1954 } 1955#ifdef IEEE80211_SUPPORT_SUPERG 1956 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1957 frm = ieee80211_add_ath(frm, 1958 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1959 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1960 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1961 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1962#endif /* IEEE80211_SUPPORT_SUPERG */ 1963 if (vap->iv_appie_assocresp != NULL) 1964 frm = add_appie(frm, vap->iv_appie_assocresp); 1965 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1966 break; 1967 1968 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1969 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1970 "send station disassociate (reason %d)", arg); 1971 m = ieee80211_getmgtframe(&frm, 1972 ic->ic_headroom + sizeof(struct ieee80211_frame), 1973 sizeof(uint16_t)); 1974 if (m == NULL) 1975 senderr(ENOMEM, is_tx_nobuf); 1976 *(uint16_t *)frm = htole16(arg); /* reason */ 1977 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1978 1979 IEEE80211_NODE_STAT(ni, tx_disassoc); 1980 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1981 break; 1982 1983 default: 1984 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1985 "invalid mgmt frame type %u", type); 1986 senderr(EINVAL, is_tx_unknownmgt); 1987 /* NOTREACHED */ 1988 } 1989 1990 /* NB: force non-ProbeResp frames to the highest queue */ 1991 params.ibp_pri = WME_AC_VO; 1992 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1993 /* NB: we know all frames are unicast */ 1994 params.ibp_try0 = bss->ni_txparms->maxretry; 1995 params.ibp_power = bss->ni_txpower; 1996 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1997bad: 1998 ieee80211_free_node(ni); 1999 return ret; 2000#undef senderr 2001#undef HTFLAGS 2002} 2003 2004/* 2005 * Return an mbuf with a probe response frame in it. 2006 * Space is left to prepend and 802.11 header at the 2007 * front but it's left to the caller to fill in. 2008 */ 2009struct mbuf * 2010ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2011{ 2012 struct ieee80211vap *vap = bss->ni_vap; 2013 struct ieee80211com *ic = bss->ni_ic; 2014 const struct ieee80211_rateset *rs; 2015 struct mbuf *m; 2016 uint16_t capinfo; 2017 uint8_t *frm; 2018 2019 /* 2020 * probe response frame format 2021 * [8] time stamp 2022 * [2] beacon interval 2023 * [2] cabability information 2024 * [tlv] ssid 2025 * [tlv] supported rates 2026 * [tlv] parameter set (FH/DS) 2027 * [tlv] parameter set (IBSS) 2028 * [tlv] country (optional) 2029 * [3] power control (optional) 2030 * [5] channel switch announcement (CSA) (optional) 2031 * [tlv] extended rate phy (ERP) 2032 * [tlv] extended supported rates 2033 * [tlv] RSN (optional) 2034 * [tlv] HT capabilities 2035 * [tlv] HT information 2036 * [tlv] WPA (optional) 2037 * [tlv] WME (optional) 2038 * [tlv] Vendor OUI HT capabilities (optional) 2039 * [tlv] Vendor OUI HT information (optional) 2040 * [tlv] Atheros capabilities 2041 * [tlv] AppIE's (optional) 2042 */ 2043 m = ieee80211_getmgtframe(&frm, 2044 ic->ic_headroom + sizeof(struct ieee80211_frame), 2045 8 2046 + sizeof(uint16_t) 2047 + sizeof(uint16_t) 2048 + 2 + IEEE80211_NWID_LEN 2049 + 2 + IEEE80211_RATE_SIZE 2050 + 7 /* max(7,3) */ 2051 + IEEE80211_COUNTRY_MAX_SIZE 2052 + 3 2053 + sizeof(struct ieee80211_csa_ie) 2054 + 3 2055 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2056 + sizeof(struct ieee80211_ie_wpa) 2057 + sizeof(struct ieee80211_ie_htcap) 2058 + sizeof(struct ieee80211_ie_htinfo) 2059 + sizeof(struct ieee80211_ie_wpa) 2060 + sizeof(struct ieee80211_wme_param) 2061 + 4 + sizeof(struct ieee80211_ie_htcap) 2062 + 4 + sizeof(struct ieee80211_ie_htinfo) 2063#ifdef IEEE80211_SUPPORT_SUPERG 2064 + sizeof(struct ieee80211_ath_ie) 2065#endif 2066 + (vap->iv_appie_proberesp != NULL ? 2067 vap->iv_appie_proberesp->ie_len : 0) 2068 ); 2069 if (m == NULL) { 2070 vap->iv_stats.is_tx_nobuf++; 2071 return NULL; 2072 } 2073 2074 memset(frm, 0, 8); /* timestamp should be filled later */ 2075 frm += 8; 2076 *(uint16_t *)frm = htole16(bss->ni_intval); 2077 frm += 2; 2078 capinfo = getcapinfo(vap, bss->ni_chan); 2079 *(uint16_t *)frm = htole16(capinfo); 2080 frm += 2; 2081 2082 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2083 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2084 frm = ieee80211_add_rates(frm, rs); 2085 2086 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2087 *frm++ = IEEE80211_ELEMID_FHPARMS; 2088 *frm++ = 5; 2089 *frm++ = bss->ni_fhdwell & 0x00ff; 2090 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2091 *frm++ = IEEE80211_FH_CHANSET( 2092 ieee80211_chan2ieee(ic, bss->ni_chan)); 2093 *frm++ = IEEE80211_FH_CHANPAT( 2094 ieee80211_chan2ieee(ic, bss->ni_chan)); 2095 *frm++ = bss->ni_fhindex; 2096 } else { 2097 *frm++ = IEEE80211_ELEMID_DSPARMS; 2098 *frm++ = 1; 2099 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2100 } 2101 2102 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2103 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2104 *frm++ = 2; 2105 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2106 } 2107 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2108 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2109 frm = ieee80211_add_countryie(frm, ic); 2110 if (vap->iv_flags & IEEE80211_F_DOTH) { 2111 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2112 frm = ieee80211_add_powerconstraint(frm, vap); 2113 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2114 frm = ieee80211_add_csa(frm, vap); 2115 } 2116 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2117 frm = ieee80211_add_erp(frm, ic); 2118 frm = ieee80211_add_xrates(frm, rs); 2119 if (vap->iv_flags & IEEE80211_F_WPA2) { 2120 if (vap->iv_rsn_ie != NULL) 2121 frm = add_ie(frm, vap->iv_rsn_ie); 2122 /* XXX else complain? */ 2123 } 2124 /* 2125 * NB: legacy 11b clients do not get certain ie's. 2126 * The caller identifies such clients by passing 2127 * a token in legacy to us. Could expand this to be 2128 * any legacy client for stuff like HT ie's. 2129 */ 2130 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2131 legacy != IEEE80211_SEND_LEGACY_11B) { 2132 frm = ieee80211_add_htcap(frm, bss); 2133 frm = ieee80211_add_htinfo(frm, bss); 2134 } 2135 if (vap->iv_flags & IEEE80211_F_WPA1) { 2136 if (vap->iv_wpa_ie != NULL) 2137 frm = add_ie(frm, vap->iv_wpa_ie); 2138 /* XXX else complain? */ 2139 } 2140 if (vap->iv_flags & IEEE80211_F_WME) 2141 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2142 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2143 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2144 legacy != IEEE80211_SEND_LEGACY_11B) { 2145 frm = ieee80211_add_htcap_vendor(frm, bss); 2146 frm = ieee80211_add_htinfo_vendor(frm, bss); 2147 } 2148#ifdef IEEE80211_SUPPORT_SUPERG 2149 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2150 legacy != IEEE80211_SEND_LEGACY_11B) 2151 frm = ieee80211_add_athcaps(frm, bss); 2152#endif 2153 if (vap->iv_appie_proberesp != NULL) 2154 frm = add_appie(frm, vap->iv_appie_proberesp); 2155 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2156 2157 return m; 2158} 2159 2160/* 2161 * Send a probe response frame to the specified mac address. 2162 * This does not go through the normal mgt frame api so we 2163 * can specify the destination address and re-use the bss node 2164 * for the sta reference. 2165 */ 2166int 2167ieee80211_send_proberesp(struct ieee80211vap *vap, 2168 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2169{ 2170 struct ieee80211_node *bss = vap->iv_bss; 2171 struct ieee80211com *ic = vap->iv_ic; 2172 struct ieee80211_frame *wh; 2173 struct mbuf *m; 2174 2175 if (vap->iv_state == IEEE80211_S_CAC) { 2176 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2177 "block %s frame in CAC state", "probe response"); 2178 vap->iv_stats.is_tx_badstate++; 2179 return EIO; /* XXX */ 2180 } 2181 2182 /* 2183 * Hold a reference on the node so it doesn't go away until after 2184 * the xmit is complete all the way in the driver. On error we 2185 * will remove our reference. 2186 */ 2187 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2188 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2189 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2190 ieee80211_node_refcnt(bss)+1); 2191 ieee80211_ref_node(bss); 2192 2193 m = ieee80211_alloc_proberesp(bss, legacy); 2194 if (m == NULL) { 2195 ieee80211_free_node(bss); 2196 return ENOMEM; 2197 } 2198 2199 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2200 KASSERT(m != NULL, ("no room for header")); 2201 2202 wh = mtod(m, struct ieee80211_frame *); 2203 ieee80211_send_setup(bss, m, 2204 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2205 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2206 /* XXX power management? */ 2207 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2208 2209 M_WME_SETAC(m, WME_AC_BE); 2210 2211 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2212 "send probe resp on channel %u to %s%s\n", 2213 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2214 legacy ? " <legacy>" : ""); 2215 IEEE80211_NODE_STAT(bss, tx_mgmt); 2216 2217 return ic->ic_raw_xmit(bss, m, NULL); 2218} 2219 2220/* 2221 * Allocate and build a RTS (Request To Send) control frame. 2222 */ 2223struct mbuf * 2224ieee80211_alloc_rts(struct ieee80211com *ic, 2225 const uint8_t ra[IEEE80211_ADDR_LEN], 2226 const uint8_t ta[IEEE80211_ADDR_LEN], 2227 uint16_t dur) 2228{ 2229 struct ieee80211_frame_rts *rts; 2230 struct mbuf *m; 2231 2232 /* XXX honor ic_headroom */ 2233 m = m_gethdr(M_DONTWAIT, MT_DATA); 2234 if (m != NULL) { 2235 rts = mtod(m, struct ieee80211_frame_rts *); 2236 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2237 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2238 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2239 *(u_int16_t *)rts->i_dur = htole16(dur); 2240 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2241 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2242 2243 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2244 } 2245 return m; 2246} 2247 2248/* 2249 * Allocate and build a CTS (Clear To Send) control frame. 2250 */ 2251struct mbuf * 2252ieee80211_alloc_cts(struct ieee80211com *ic, 2253 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2254{ 2255 struct ieee80211_frame_cts *cts; 2256 struct mbuf *m; 2257 2258 /* XXX honor ic_headroom */ 2259 m = m_gethdr(M_DONTWAIT, MT_DATA); 2260 if (m != NULL) { 2261 cts = mtod(m, struct ieee80211_frame_cts *); 2262 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2263 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2264 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2265 *(u_int16_t *)cts->i_dur = htole16(dur); 2266 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2267 2268 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2269 } 2270 return m; 2271} 2272 2273static void 2274ieee80211_tx_mgt_timeout(void *arg) 2275{ 2276 struct ieee80211_node *ni = arg; 2277 struct ieee80211vap *vap = ni->ni_vap; 2278 2279 if (vap->iv_state != IEEE80211_S_INIT && 2280 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2281 /* 2282 * NB: it's safe to specify a timeout as the reason here; 2283 * it'll only be used in the right state. 2284 */ 2285 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2286 IEEE80211_SCAN_FAIL_TIMEOUT); 2287 } 2288} 2289 2290static void 2291ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2292{ 2293 struct ieee80211vap *vap = ni->ni_vap; 2294 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2295 2296 /* 2297 * Frame transmit completed; arrange timer callback. If 2298 * transmit was successfuly we wait for response. Otherwise 2299 * we arrange an immediate callback instead of doing the 2300 * callback directly since we don't know what state the driver 2301 * is in (e.g. what locks it is holding). This work should 2302 * not be too time-critical and not happen too often so the 2303 * added overhead is acceptable. 2304 * 2305 * XXX what happens if !acked but response shows up before callback? 2306 */ 2307 if (vap->iv_state == ostate) 2308 callout_reset(&vap->iv_mgtsend, 2309 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2310 ieee80211_tx_mgt_timeout, ni); 2311} 2312 2313static void 2314ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2315 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2316{ 2317 struct ieee80211vap *vap = ni->ni_vap; 2318 struct ieee80211com *ic = ni->ni_ic; 2319 struct ieee80211_rateset *rs = &ni->ni_rates; 2320 uint16_t capinfo; 2321 2322 /* 2323 * beacon frame format 2324 * [8] time stamp 2325 * [2] beacon interval 2326 * [2] cabability information 2327 * [tlv] ssid 2328 * [tlv] supported rates 2329 * [3] parameter set (DS) 2330 * [8] CF parameter set (optional) 2331 * [tlv] parameter set (IBSS/TIM) 2332 * [tlv] country (optional) 2333 * [3] power control (optional) 2334 * [5] channel switch announcement (CSA) (optional) 2335 * [tlv] extended rate phy (ERP) 2336 * [tlv] extended supported rates 2337 * [tlv] RSN parameters 2338 * [tlv] HT capabilities 2339 * [tlv] HT information 2340 * XXX Vendor-specific OIDs (e.g. Atheros) 2341 * [tlv] WPA parameters 2342 * [tlv] WME parameters 2343 * [tlv] Vendor OUI HT capabilities (optional) 2344 * [tlv] Vendor OUI HT information (optional) 2345 * [tlv] Atheros capabilities (optional) 2346 * [tlv] TDMA parameters (optional) 2347 * [tlv] application data (optional) 2348 */ 2349 2350 memset(bo, 0, sizeof(*bo)); 2351 2352 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2353 frm += 8; 2354 *(uint16_t *)frm = htole16(ni->ni_intval); 2355 frm += 2; 2356 capinfo = getcapinfo(vap, ni->ni_chan); 2357 bo->bo_caps = (uint16_t *)frm; 2358 *(uint16_t *)frm = htole16(capinfo); 2359 frm += 2; 2360 *frm++ = IEEE80211_ELEMID_SSID; 2361 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2362 *frm++ = ni->ni_esslen; 2363 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2364 frm += ni->ni_esslen; 2365 } else 2366 *frm++ = 0; 2367 frm = ieee80211_add_rates(frm, rs); 2368 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2369 *frm++ = IEEE80211_ELEMID_DSPARMS; 2370 *frm++ = 1; 2371 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2372 } 2373 if (ic->ic_flags & IEEE80211_F_PCF) { 2374 bo->bo_cfp = frm; 2375 frm = ieee80211_add_cfparms(frm, ic); 2376 } 2377 bo->bo_tim = frm; 2378 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2379 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2380 *frm++ = 2; 2381 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2382 bo->bo_tim_len = 0; 2383 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2384 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2385 2386 tie->tim_ie = IEEE80211_ELEMID_TIM; 2387 tie->tim_len = 4; /* length */ 2388 tie->tim_count = 0; /* DTIM count */ 2389 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2390 tie->tim_bitctl = 0; /* bitmap control */ 2391 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2392 frm += sizeof(struct ieee80211_tim_ie); 2393 bo->bo_tim_len = 1; 2394 } 2395 bo->bo_tim_trailer = frm; 2396 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2397 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2398 frm = ieee80211_add_countryie(frm, ic); 2399 if (vap->iv_flags & IEEE80211_F_DOTH) { 2400 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2401 frm = ieee80211_add_powerconstraint(frm, vap); 2402 bo->bo_csa = frm; 2403 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2404 frm = ieee80211_add_csa(frm, vap); 2405 } else 2406 bo->bo_csa = frm; 2407 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2408 bo->bo_erp = frm; 2409 frm = ieee80211_add_erp(frm, ic); 2410 } 2411 frm = ieee80211_add_xrates(frm, rs); 2412 if (vap->iv_flags & IEEE80211_F_WPA2) { 2413 if (vap->iv_rsn_ie != NULL) 2414 frm = add_ie(frm, vap->iv_rsn_ie); 2415 /* XXX else complain */ 2416 } 2417 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2418 frm = ieee80211_add_htcap(frm, ni); 2419 bo->bo_htinfo = frm; 2420 frm = ieee80211_add_htinfo(frm, ni); 2421 } 2422 if (vap->iv_flags & IEEE80211_F_WPA1) { 2423 if (vap->iv_wpa_ie != NULL) 2424 frm = add_ie(frm, vap->iv_wpa_ie); 2425 /* XXX else complain */ 2426 } 2427 if (vap->iv_flags & IEEE80211_F_WME) { 2428 bo->bo_wme = frm; 2429 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2430 } 2431 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2432 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2433 frm = ieee80211_add_htcap_vendor(frm, ni); 2434 frm = ieee80211_add_htinfo_vendor(frm, ni); 2435 } 2436#ifdef IEEE80211_SUPPORT_SUPERG 2437 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2438 bo->bo_ath = frm; 2439 frm = ieee80211_add_athcaps(frm, ni); 2440 } 2441#endif 2442#ifdef IEEE80211_SUPPORT_TDMA 2443 if (vap->iv_caps & IEEE80211_C_TDMA) { 2444 bo->bo_tdma = frm; 2445 frm = ieee80211_add_tdma(frm, vap); 2446 } 2447#endif 2448 if (vap->iv_appie_beacon != NULL) { 2449 bo->bo_appie = frm; 2450 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2451 frm = add_appie(frm, vap->iv_appie_beacon); 2452 } 2453 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2454 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2455 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2456} 2457 2458/* 2459 * Allocate a beacon frame and fillin the appropriate bits. 2460 */ 2461struct mbuf * 2462ieee80211_beacon_alloc(struct ieee80211_node *ni, 2463 struct ieee80211_beacon_offsets *bo) 2464{ 2465 struct ieee80211vap *vap = ni->ni_vap; 2466 struct ieee80211com *ic = ni->ni_ic; 2467 struct ifnet *ifp = vap->iv_ifp; 2468 struct ieee80211_frame *wh; 2469 struct mbuf *m; 2470 int pktlen; 2471 uint8_t *frm; 2472 2473 /* 2474 * beacon frame format 2475 * [8] time stamp 2476 * [2] beacon interval 2477 * [2] cabability information 2478 * [tlv] ssid 2479 * [tlv] supported rates 2480 * [3] parameter set (DS) 2481 * [8] CF parameter set (optional) 2482 * [tlv] parameter set (IBSS/TIM) 2483 * [tlv] country (optional) 2484 * [3] power control (optional) 2485 * [5] channel switch announcement (CSA) (optional) 2486 * [tlv] extended rate phy (ERP) 2487 * [tlv] extended supported rates 2488 * [tlv] RSN parameters 2489 * [tlv] HT capabilities 2490 * [tlv] HT information 2491 * [tlv] Vendor OUI HT capabilities (optional) 2492 * [tlv] Vendor OUI HT information (optional) 2493 * XXX Vendor-specific OIDs (e.g. Atheros) 2494 * [tlv] WPA parameters 2495 * [tlv] WME parameters 2496 * [tlv] TDMA parameters (optional) 2497 * [tlv] application data (optional) 2498 * NB: we allocate the max space required for the TIM bitmap. 2499 * XXX how big is this? 2500 */ 2501 pktlen = 8 /* time stamp */ 2502 + sizeof(uint16_t) /* beacon interval */ 2503 + sizeof(uint16_t) /* capabilities */ 2504 + 2 + ni->ni_esslen /* ssid */ 2505 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2506 + 2 + 1 /* DS parameters */ 2507 + 2 + 6 /* CF parameters */ 2508 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2509 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2510 + 2 + 1 /* power control */ 2511 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2512 + 2 + 1 /* ERP */ 2513 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2514 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2515 2*sizeof(struct ieee80211_ie_wpa) : 0) 2516 /* XXX conditional? */ 2517 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2518 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2519 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2520 sizeof(struct ieee80211_wme_param) : 0) 2521#ifdef IEEE80211_SUPPORT_SUPERG 2522 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2523#endif 2524#ifdef IEEE80211_SUPPORT_TDMA 2525 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2526 sizeof(struct ieee80211_tdma_param) : 0) 2527#endif 2528 + IEEE80211_MAX_APPIE 2529 ; 2530 m = ieee80211_getmgtframe(&frm, 2531 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2532 if (m == NULL) { 2533 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2534 "%s: cannot get buf; size %u\n", __func__, pktlen); 2535 vap->iv_stats.is_tx_nobuf++; 2536 return NULL; 2537 } 2538 ieee80211_beacon_construct(m, frm, bo, ni); 2539 2540 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2541 KASSERT(m != NULL, ("no space for 802.11 header?")); 2542 wh = mtod(m, struct ieee80211_frame *); 2543 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2544 IEEE80211_FC0_SUBTYPE_BEACON; 2545 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2546 *(uint16_t *)wh->i_dur = 0; 2547 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2548 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2549 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2550 *(uint16_t *)wh->i_seq = 0; 2551 2552 return m; 2553} 2554 2555/* 2556 * Update the dynamic parts of a beacon frame based on the current state. 2557 */ 2558int 2559ieee80211_beacon_update(struct ieee80211_node *ni, 2560 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2561{ 2562 struct ieee80211vap *vap = ni->ni_vap; 2563 struct ieee80211com *ic = ni->ni_ic; 2564 int len_changed = 0; 2565 uint16_t capinfo; 2566 2567 IEEE80211_LOCK(ic); 2568 /* 2569 * Handle 11h channel change when we've reached the count. 2570 * We must recalculate the beacon frame contents to account 2571 * for the new channel. Note we do this only for the first 2572 * vap that reaches this point; subsequent vaps just update 2573 * their beacon state to reflect the recalculated channel. 2574 */ 2575 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2576 vap->iv_csa_count == ic->ic_csa_count) { 2577 vap->iv_csa_count = 0; 2578 /* 2579 * Effect channel change before reconstructing the beacon 2580 * frame contents as many places reference ni_chan. 2581 */ 2582 if (ic->ic_csa_newchan != NULL) 2583 ieee80211_csa_completeswitch(ic); 2584 /* 2585 * NB: ieee80211_beacon_construct clears all pending 2586 * updates in bo_flags so we don't need to explicitly 2587 * clear IEEE80211_BEACON_CSA. 2588 */ 2589 ieee80211_beacon_construct(m, 2590 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2591 2592 /* XXX do WME aggressive mode processing? */ 2593 IEEE80211_UNLOCK(ic); 2594 return 1; /* just assume length changed */ 2595 } 2596 2597 /* XXX faster to recalculate entirely or just changes? */ 2598 capinfo = getcapinfo(vap, ni->ni_chan); 2599 *bo->bo_caps = htole16(capinfo); 2600 2601 if (vap->iv_flags & IEEE80211_F_WME) { 2602 struct ieee80211_wme_state *wme = &ic->ic_wme; 2603 2604 /* 2605 * Check for agressive mode change. When there is 2606 * significant high priority traffic in the BSS 2607 * throttle back BE traffic by using conservative 2608 * parameters. Otherwise BE uses agressive params 2609 * to optimize performance of legacy/non-QoS traffic. 2610 */ 2611 if (wme->wme_flags & WME_F_AGGRMODE) { 2612 if (wme->wme_hipri_traffic > 2613 wme->wme_hipri_switch_thresh) { 2614 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2615 "%s: traffic %u, disable aggressive mode\n", 2616 __func__, wme->wme_hipri_traffic); 2617 wme->wme_flags &= ~WME_F_AGGRMODE; 2618 ieee80211_wme_updateparams_locked(vap); 2619 wme->wme_hipri_traffic = 2620 wme->wme_hipri_switch_hysteresis; 2621 } else 2622 wme->wme_hipri_traffic = 0; 2623 } else { 2624 if (wme->wme_hipri_traffic <= 2625 wme->wme_hipri_switch_thresh) { 2626 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2627 "%s: traffic %u, enable aggressive mode\n", 2628 __func__, wme->wme_hipri_traffic); 2629 wme->wme_flags |= WME_F_AGGRMODE; 2630 ieee80211_wme_updateparams_locked(vap); 2631 wme->wme_hipri_traffic = 0; 2632 } else 2633 wme->wme_hipri_traffic = 2634 wme->wme_hipri_switch_hysteresis; 2635 } 2636 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2637 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2638 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2639 } 2640 } 2641 2642 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2643 ieee80211_ht_update_beacon(vap, bo); 2644 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2645 } 2646#ifdef IEEE80211_SUPPORT_TDMA 2647 if (vap->iv_caps & IEEE80211_C_TDMA) { 2648 /* 2649 * NB: the beacon is potentially updated every TBTT. 2650 */ 2651 ieee80211_tdma_update_beacon(vap, bo); 2652 } 2653#endif 2654 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2655 struct ieee80211_tim_ie *tie = 2656 (struct ieee80211_tim_ie *) bo->bo_tim; 2657 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2658 u_int timlen, timoff, i; 2659 /* 2660 * ATIM/DTIM needs updating. If it fits in the 2661 * current space allocated then just copy in the 2662 * new bits. Otherwise we need to move any trailing 2663 * data to make room. Note that we know there is 2664 * contiguous space because ieee80211_beacon_allocate 2665 * insures there is space in the mbuf to write a 2666 * maximal-size virtual bitmap (based on iv_max_aid). 2667 */ 2668 /* 2669 * Calculate the bitmap size and offset, copy any 2670 * trailer out of the way, and then copy in the 2671 * new bitmap and update the information element. 2672 * Note that the tim bitmap must contain at least 2673 * one byte and any offset must be even. 2674 */ 2675 if (vap->iv_ps_pending != 0) { 2676 timoff = 128; /* impossibly large */ 2677 for (i = 0; i < vap->iv_tim_len; i++) 2678 if (vap->iv_tim_bitmap[i]) { 2679 timoff = i &~ 1; 2680 break; 2681 } 2682 KASSERT(timoff != 128, ("tim bitmap empty!")); 2683 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2684 if (vap->iv_tim_bitmap[i]) 2685 break; 2686 timlen = 1 + (i - timoff); 2687 } else { 2688 timoff = 0; 2689 timlen = 1; 2690 } 2691 if (timlen != bo->bo_tim_len) { 2692 /* copy up/down trailer */ 2693 int adjust = tie->tim_bitmap+timlen 2694 - bo->bo_tim_trailer; 2695 ovbcopy(bo->bo_tim_trailer, 2696 bo->bo_tim_trailer+adjust, 2697 bo->bo_tim_trailer_len); 2698 bo->bo_tim_trailer += adjust; 2699 bo->bo_erp += adjust; 2700 bo->bo_htinfo += adjust; 2701#ifdef IEEE80211_SUPERG_SUPPORT 2702 bo->bo_ath += adjust; 2703#endif 2704#ifdef IEEE80211_TDMA_SUPPORT 2705 bo->bo_tdma += adjust; 2706#endif 2707 bo->bo_appie += adjust; 2708 bo->bo_wme += adjust; 2709 bo->bo_csa += adjust; 2710 bo->bo_tim_len = timlen; 2711 2712 /* update information element */ 2713 tie->tim_len = 3 + timlen; 2714 tie->tim_bitctl = timoff; 2715 len_changed = 1; 2716 } 2717 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2718 bo->bo_tim_len); 2719 2720 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2721 2722 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2723 "%s: TIM updated, pending %u, off %u, len %u\n", 2724 __func__, vap->iv_ps_pending, timoff, timlen); 2725 } 2726 /* count down DTIM period */ 2727 if (tie->tim_count == 0) 2728 tie->tim_count = tie->tim_period - 1; 2729 else 2730 tie->tim_count--; 2731 /* update state for buffered multicast frames on DTIM */ 2732 if (mcast && tie->tim_count == 0) 2733 tie->tim_bitctl |= 1; 2734 else 2735 tie->tim_bitctl &= ~1; 2736 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2737 struct ieee80211_csa_ie *csa = 2738 (struct ieee80211_csa_ie *) bo->bo_csa; 2739 2740 /* 2741 * Insert or update CSA ie. If we're just starting 2742 * to count down to the channel switch then we need 2743 * to insert the CSA ie. Otherwise we just need to 2744 * drop the count. The actual change happens above 2745 * when the vap's count reaches the target count. 2746 */ 2747 if (vap->iv_csa_count == 0) { 2748 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2749 bo->bo_erp += sizeof(*csa); 2750 bo->bo_htinfo += sizeof(*csa); 2751 bo->bo_wme += sizeof(*csa); 2752#ifdef IEEE80211_SUPERG_SUPPORT 2753 bo->bo_ath += sizeof(*csa); 2754#endif 2755#ifdef IEEE80211_TDMA_SUPPORT 2756 bo->bo_tdma += sizeof(*csa); 2757#endif 2758 bo->bo_appie += sizeof(*csa); 2759 bo->bo_csa_trailer_len += sizeof(*csa); 2760 bo->bo_tim_trailer_len += sizeof(*csa); 2761 m->m_len += sizeof(*csa); 2762 m->m_pkthdr.len += sizeof(*csa); 2763 2764 ieee80211_add_csa(bo->bo_csa, vap); 2765 } else 2766 csa->csa_count--; 2767 vap->iv_csa_count++; 2768 /* NB: don't clear IEEE80211_BEACON_CSA */ 2769 } 2770 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2771 /* 2772 * ERP element needs updating. 2773 */ 2774 (void) ieee80211_add_erp(bo->bo_erp, ic); 2775 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2776 } 2777#ifdef IEEE80211_SUPPORT_SUPERG 2778 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2779 ieee80211_add_athcaps(bo->bo_ath, ni); 2780 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2781 } 2782#endif 2783 } 2784 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2785 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2786 int aielen; 2787 uint8_t *frm; 2788 2789 aielen = 0; 2790 if (aie != NULL) 2791 aielen += aie->ie_len; 2792 if (aielen != bo->bo_appie_len) { 2793 /* copy up/down trailer */ 2794 int adjust = aielen - bo->bo_appie_len; 2795 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2796 bo->bo_tim_trailer_len); 2797 bo->bo_tim_trailer += adjust; 2798 bo->bo_appie += adjust; 2799 bo->bo_appie_len = aielen; 2800 2801 len_changed = 1; 2802 } 2803 frm = bo->bo_appie; 2804 if (aie != NULL) 2805 frm = add_appie(frm, aie); 2806 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2807 } 2808 IEEE80211_UNLOCK(ic); 2809 2810 return len_changed; 2811} 2812