ieee80211_output.c revision 184281
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2008 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 184281 2008-10-26 00:32:02Z 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#include <net80211/ieee80211_wds.h> 51 52#ifdef INET 53#include <netinet/in.h> 54#include <netinet/if_ether.h> 55#include <netinet/in_systm.h> 56#include <netinet/ip.h> 57#endif 58 59#define ETHER_HEADER_COPY(dst, src) \ 60 memcpy(dst, src, sizeof(struct ether_header)) 61 62static struct mbuf *ieee80211_encap_fastframe(struct ieee80211vap *, 63 struct mbuf *m1, const struct ether_header *eh1, 64 struct mbuf *m2, const struct ether_header *eh2); 65static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 66 u_int hdrsize, u_int ciphdrsize, u_int mtu); 67static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 68 69#ifdef IEEE80211_DEBUG 70/* 71 * Decide if an outbound management frame should be 72 * printed when debugging is enabled. This filters some 73 * of the less interesting frames that come frequently 74 * (e.g. beacons). 75 */ 76static __inline int 77doprint(struct ieee80211vap *vap, int subtype) 78{ 79 switch (subtype) { 80 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 81 return (vap->iv_opmode == IEEE80211_M_IBSS); 82 } 83 return 1; 84} 85#endif 86 87/* 88 * Start method for vap's. All packets from the stack come 89 * through here. We handle common processing of the packets 90 * before dispatching them to the underlying device. 91 */ 92void 93ieee80211_start(struct ifnet *ifp) 94{ 95#define IS_DWDS(vap) \ 96 (vap->iv_opmode == IEEE80211_M_WDS && \ 97 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 98 struct ieee80211vap *vap = ifp->if_softc; 99 struct ieee80211com *ic = vap->iv_ic; 100 struct ifnet *parent = ic->ic_ifp; 101 struct ieee80211_node *ni; 102 struct mbuf *m; 103 struct ether_header *eh; 104 int error; 105 106 /* NB: parent must be up and running */ 107 if (!IFNET_IS_UP_RUNNING(parent)) { 108 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 109 "%s: ignore queue, parent %s not up+running\n", 110 __func__, parent->if_xname); 111 /* XXX stat */ 112 return; 113 } 114 if (vap->iv_state == IEEE80211_S_SLEEP) { 115 /* 116 * In power save, wakeup device for transmit. 117 */ 118 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 119 return; 120 } 121 /* 122 * No data frames go out unless we're running. 123 * Note in particular this covers CAC and CSA 124 * states (though maybe we should check muting 125 * for CSA). 126 */ 127 if (vap->iv_state != IEEE80211_S_RUN) { 128 IEEE80211_LOCK(ic); 129 /* re-check under the com lock to avoid races */ 130 if (vap->iv_state != IEEE80211_S_RUN) { 131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 132 "%s: ignore queue, in %s state\n", 133 __func__, ieee80211_state_name[vap->iv_state]); 134 vap->iv_stats.is_tx_badstate++; 135 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 136 IEEE80211_UNLOCK(ic); 137 return; 138 } 139 IEEE80211_UNLOCK(ic); 140 } 141 for (;;) { 142 IFQ_DEQUEUE(&ifp->if_snd, m); 143 if (m == NULL) 144 break; 145 /* 146 * Sanitize mbuf flags for net80211 use. We cannot 147 * clear M_PWR_SAV because this may be set for frames 148 * that are re-submitted from the power save queue. 149 * 150 * NB: This must be done before ieee80211_classify as 151 * it marks EAPOL in frames with M_EAPOL. 152 */ 153 m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 154 /* 155 * Cancel any background scan. 156 */ 157 if (ic->ic_flags & IEEE80211_F_SCAN) 158 ieee80211_cancel_anyscan(vap); 159 /* 160 * Find the node for the destination so we can do 161 * things like power save and fast frames aggregation. 162 * 163 * NB: past this point various code assumes the first 164 * mbuf has the 802.3 header present (and contiguous). 165 */ 166 ni = NULL; 167 if (m->m_len < sizeof(struct ether_header) && 168 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 169 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 170 "discard frame, %s\n", "m_pullup failed"); 171 vap->iv_stats.is_tx_nobuf++; /* XXX */ 172 ifp->if_oerrors++; 173 continue; 174 } 175 eh = mtod(m, struct ether_header *); 176 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 177 if (IS_DWDS(vap)) { 178 /* 179 * Only unicast frames from the above go out 180 * DWDS vaps; multicast frames are handled by 181 * dispatching the frame as it comes through 182 * the AP vap (see below). 183 */ 184 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 185 eh->ether_dhost, "mcast", "%s", "on DWDS"); 186 vap->iv_stats.is_dwds_mcast++; 187 m_freem(m); 188 continue; 189 } 190 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 191 /* 192 * Spam DWDS vap's w/ multicast traffic. 193 */ 194 /* XXX only if dwds in use? */ 195 ieee80211_dwds_mcast(vap, m); 196 } 197 } 198 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 199 if (ni == NULL) { 200 /* NB: ieee80211_find_txnode does stat+msg */ 201 ifp->if_oerrors++; 202 m_freem(m); 203 continue; 204 } 205 /* XXX AUTH'd */ 206 /* XXX mark vap to identify if associd is required */ 207 if (ni->ni_associd == 0 && 208 (vap->iv_opmode == IEEE80211_M_STA || 209 vap->iv_opmode == IEEE80211_M_HOSTAP || IS_DWDS(vap))) { 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 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 221 (m->m_flags & M_PWR_SAV) == 0) { 222 /* 223 * Station in power save mode; pass the frame 224 * to the 802.11 layer and continue. We'll get 225 * the frame back when the time is right. 226 * XXX lose WDS vap linkage? 227 */ 228 ieee80211_pwrsave(ni, m); 229 ieee80211_free_node(ni); 230 continue; 231 } 232 /* calculate priority so drivers can find the tx queue */ 233 if (ieee80211_classify(ni, m)) { 234 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 235 eh->ether_dhost, NULL, 236 "%s", "classification failure"); 237 vap->iv_stats.is_tx_classify++; 238 ifp->if_oerrors++; 239 m_freem(m); 240 ieee80211_free_node(ni); 241 continue; 242 } 243 244 BPF_MTAP(ifp, m); /* 802.11 tx path */ 245 246 /* 247 * XXX When ni is associated with a WDS link then 248 * the vap will be the WDS vap but ni_vap will point 249 * to the ap vap the station associated to. Once 250 * we handoff the packet to the driver the callback 251 * to ieee80211_encap won't be able to tell if the 252 * packet should be encapsulated for WDS or not (e.g. 253 * multicast frames will not be handled correctly). 254 * We hack this by marking the mbuf so ieee80211_encap 255 * can do the right thing. 256 */ 257 if (vap->iv_opmode == IEEE80211_M_WDS) 258 m->m_flags |= M_WDS; 259 else 260 m->m_flags &= ~M_WDS; 261 262 /* 263 * Stash the node pointer and hand the frame off to 264 * the underlying device. Note that we do this after 265 * any call to ieee80211_dwds_mcast because that code 266 * uses any existing value for rcvif. 267 */ 268 m->m_pkthdr.rcvif = (void *)ni; 269 270 /* XXX defer if_start calls? */ 271 IFQ_HANDOFF(parent, m, error); 272 if (error != 0) { 273 /* NB: IFQ_HANDOFF reclaims mbuf */ 274 ieee80211_free_node(ni); 275 } else { 276 ifp->if_opackets++; 277 } 278 ic->ic_lastdata = ticks; 279 } 280#undef IS_DWDS 281} 282 283/* 284 * 802.11 output routine. This is (currently) used only to 285 * connect bpf write calls to the 802.11 layer for injecting 286 * raw 802.11 frames. Note we locate the ieee80211com from 287 * the ifnet using a spare field setup at attach time. This 288 * will go away when the virtual ap support comes in. 289 */ 290int 291ieee80211_output(struct ifnet *ifp, struct mbuf *m, 292 struct sockaddr *dst, struct rtentry *rt0) 293{ 294#define senderr(e) do { error = (e); goto bad;} while (0) 295 struct ieee80211_node *ni = NULL; 296 struct ieee80211vap *vap; 297 struct ieee80211_frame *wh; 298 int error; 299 300 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 301 /* 302 * Short-circuit requests if the vap is marked OACTIVE 303 * as this is used when tearing down state to indicate 304 * the vap may be gone. This can also happen because a 305 * packet came down through ieee80211_start before the 306 * vap entered RUN state in which case it's also ok to 307 * just drop the frame. This should not be necessary 308 * but callers of if_output don't check OACTIVE. 309 */ 310 senderr(ENETDOWN); 311 } 312 vap = ifp->if_softc; 313 /* 314 * Hand to the 802.3 code if not tagged as 315 * a raw 802.11 frame. 316 */ 317 if (dst->sa_family != AF_IEEE80211) 318 return vap->iv_output(ifp, m, dst, rt0); 319#ifdef MAC 320 error = mac_check_ifnet_transmit(ifp, m); 321 if (error) 322 senderr(error); 323#endif 324 if (ifp->if_flags & IFF_MONITOR) 325 senderr(ENETDOWN); 326 if (!IFNET_IS_UP_RUNNING(ifp)) 327 senderr(ENETDOWN); 328 if (vap->iv_state == IEEE80211_S_CAC) { 329 IEEE80211_DPRINTF(vap, 330 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 331 "block %s frame in CAC state\n", "raw data"); 332 vap->iv_stats.is_tx_badstate++; 333 senderr(EIO); /* XXX */ 334 } 335 /* XXX bypass bridge, pfil, carp, etc. */ 336 337 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 338 senderr(EIO); /* XXX */ 339 wh = mtod(m, struct ieee80211_frame *); 340 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 341 IEEE80211_FC0_VERSION_0) 342 senderr(EIO); /* XXX */ 343 344 /* locate destination node */ 345 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 346 case IEEE80211_FC1_DIR_NODS: 347 case IEEE80211_FC1_DIR_FROMDS: 348 ni = ieee80211_find_txnode(vap, wh->i_addr1); 349 break; 350 case IEEE80211_FC1_DIR_TODS: 351 case IEEE80211_FC1_DIR_DSTODS: 352 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 353 senderr(EIO); /* XXX */ 354 ni = ieee80211_find_txnode(vap, wh->i_addr3); 355 break; 356 default: 357 senderr(EIO); /* XXX */ 358 } 359 if (ni == NULL) { 360 /* 361 * Permit packets w/ bpf params through regardless 362 * (see below about sa_len). 363 */ 364 if (dst->sa_len == 0) 365 senderr(EHOSTUNREACH); 366 ni = ieee80211_ref_node(vap->iv_bss); 367 } 368 369 /* 370 * Sanitize mbuf for net80211 flags leaked from above. 371 * 372 * NB: This must be done before ieee80211_classify as 373 * it marks EAPOL in frames with M_EAPOL. 374 */ 375 m->m_flags &= ~M_80211_TX; 376 377 /* calculate priority so drivers can find the tx queue */ 378 /* XXX assumes an 802.3 frame */ 379 if (ieee80211_classify(ni, m)) 380 senderr(EIO); /* XXX */ 381 382 BPF_MTAP(ifp, m); 383 384 /* 385 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 386 * present by setting the sa_len field of the sockaddr (yes, 387 * this is a hack). 388 * NB: we assume sa_data is suitably aligned to cast. 389 */ 390 return vap->iv_ic->ic_raw_xmit(ni, m, 391 (const struct ieee80211_bpf_params *)(dst->sa_len ? 392 dst->sa_data : NULL)); 393bad: 394 if (m != NULL) 395 m_freem(m); 396 if (ni != NULL) 397 ieee80211_free_node(ni); 398 return error; 399#undef senderr 400} 401 402/* 403 * Set the direction field and address fields of an outgoing 404 * non-QoS frame. Note this should be called early on in 405 * constructing a frame as it sets i_fc[1]; other bits can 406 * then be or'd in. 407 */ 408static void 409ieee80211_send_setup( 410 struct ieee80211_node *ni, 411 struct ieee80211_frame *wh, 412 int type, 413 const uint8_t sa[IEEE80211_ADDR_LEN], 414 const uint8_t da[IEEE80211_ADDR_LEN], 415 const uint8_t bssid[IEEE80211_ADDR_LEN]) 416{ 417#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 418 419 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 420 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 421 struct ieee80211vap *vap = ni->ni_vap; 422 423 switch (vap->iv_opmode) { 424 case IEEE80211_M_STA: 425 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 426 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 427 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 428 IEEE80211_ADDR_COPY(wh->i_addr3, da); 429 break; 430 case IEEE80211_M_IBSS: 431 case IEEE80211_M_AHDEMO: 432 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 433 IEEE80211_ADDR_COPY(wh->i_addr1, da); 434 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 435 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 436 break; 437 case IEEE80211_M_HOSTAP: 438 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 439 IEEE80211_ADDR_COPY(wh->i_addr1, da); 440 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 441 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 442 break; 443 case IEEE80211_M_WDS: 444 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 445 IEEE80211_ADDR_COPY(wh->i_addr1, da); 446 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 447 IEEE80211_ADDR_COPY(wh->i_addr3, da); 448 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 449 break; 450 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 451 break; 452 } 453 } else { 454 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 455 IEEE80211_ADDR_COPY(wh->i_addr1, da); 456 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 457 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 458 } 459 *(uint16_t *)&wh->i_dur[0] = 0; 460 /* XXX probe response use per-vap seq#? */ 461 /* NB: use non-QoS tid */ 462 *(uint16_t *)&wh->i_seq[0] = 463 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 464 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 465#undef WH4 466} 467 468/* 469 * Send a management frame to the specified node. The node pointer 470 * must have a reference as the pointer will be passed to the driver 471 * and potentially held for a long time. If the frame is successfully 472 * dispatched to the driver, then it is responsible for freeing the 473 * reference (and potentially free'ing up any associated storage); 474 * otherwise deal with reclaiming any reference (on error). 475 */ 476int 477ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type) 478{ 479 struct ieee80211vap *vap = ni->ni_vap; 480 struct ieee80211com *ic = ni->ni_ic; 481 struct ieee80211_frame *wh; 482 483 KASSERT(ni != NULL, ("null node")); 484 485 if (vap->iv_state == IEEE80211_S_CAC) { 486 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 487 ni, "block %s frame in CAC state", 488 ieee80211_mgt_subtype_name[ 489 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 490 IEEE80211_FC0_SUBTYPE_SHIFT]); 491 vap->iv_stats.is_tx_badstate++; 492 ieee80211_free_node(ni); 493 m_freem(m); 494 return EIO; /* XXX */ 495 } 496 497 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 498 if (m == NULL) { 499 ieee80211_free_node(ni); 500 return ENOMEM; 501 } 502 503 wh = mtod(m, struct ieee80211_frame *); 504 ieee80211_send_setup(ni, wh, 505 IEEE80211_FC0_TYPE_MGT | type, 506 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 507 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 508 m->m_flags &= ~M_LINK0; 509 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 510 "encrypting frame (%s)", __func__); 511 wh->i_fc[1] |= IEEE80211_FC1_WEP; 512 } 513 if (type != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 514 /* NB: force non-ProbeResp frames to the highest queue */ 515 M_WME_SETAC(m, WME_AC_VO); 516 } else 517 M_WME_SETAC(m, WME_AC_BE); 518#ifdef IEEE80211_DEBUG 519 /* avoid printing too many frames */ 520 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 521 ieee80211_msg_dumppkts(vap)) { 522 printf("[%s] send %s on channel %u\n", 523 ether_sprintf(wh->i_addr1), 524 ieee80211_mgt_subtype_name[ 525 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 526 IEEE80211_FC0_SUBTYPE_SHIFT], 527 ieee80211_chan2ieee(ic, ic->ic_curchan)); 528 } 529#endif 530 IEEE80211_NODE_STAT(ni, tx_mgmt); 531 532 return ic->ic_raw_xmit(ni, m, NULL); 533} 534 535/* 536 * Send a null data frame to the specified node. 537 * 538 * NB: the caller is assumed to have setup a node reference 539 * for use; this is necessary to deal with a race condition 540 * when probing for inactive stations. Like ieee80211_mgmt_output 541 * we must cleanup any node reference on error; however we 542 * can safely just unref it as we know it will never be the 543 * last reference to the node. 544 */ 545int 546ieee80211_send_nulldata(struct ieee80211_node *ni) 547{ 548 struct ieee80211vap *vap = ni->ni_vap; 549 struct ieee80211com *ic = ni->ni_ic; 550 struct mbuf *m; 551 struct ieee80211_frame *wh; 552 553 if (vap->iv_state == IEEE80211_S_CAC) { 554 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 555 ni, "block %s frame in CAC state", "null data"); 556 ieee80211_unref_node(&ni); 557 vap->iv_stats.is_tx_badstate++; 558 return EIO; /* XXX */ 559 } 560 561 m = m_gethdr(M_NOWAIT, MT_HEADER); 562 if (m == NULL) { 563 /* XXX debug msg */ 564 ieee80211_unref_node(&ni); 565 vap->iv_stats.is_tx_nobuf++; 566 return ENOMEM; 567 } 568 MH_ALIGN(m, sizeof(struct ieee80211_frame)); 569 570 wh = mtod(m, struct ieee80211_frame *); 571 ieee80211_send_setup(ni, wh, 572 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 573 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 574 if (vap->iv_opmode != IEEE80211_M_WDS) { 575 /* NB: power management bit is never sent by an AP */ 576 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 577 vap->iv_opmode != IEEE80211_M_HOSTAP) 578 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 579 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 580 } else { 581 /* NB: 4-address frame */ 582 m->m_len = m->m_pkthdr.len = 583 sizeof(struct ieee80211_frame_addr4); 584 } 585 M_WME_SETAC(m, WME_AC_BE); 586 587 IEEE80211_NODE_STAT(ni, tx_data); 588 589 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 590 "send null data frame on channel %u, pwr mgt %s", 591 ieee80211_chan2ieee(ic, ic->ic_curchan), 592 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 593 594 return ic->ic_raw_xmit(ni, m, NULL); 595} 596 597/* 598 * Assign priority to a frame based on any vlan tag assigned 599 * to the station and/or any Diffserv setting in an IP header. 600 * Finally, if an ACM policy is setup (in station mode) it's 601 * applied. 602 */ 603int 604ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 605{ 606 const struct ether_header *eh = mtod(m, struct ether_header *); 607 int v_wme_ac, d_wme_ac, ac; 608 609 /* 610 * Always promote PAE/EAPOL frames to high priority. 611 */ 612 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 613 /* NB: mark so others don't need to check header */ 614 m->m_flags |= M_EAPOL; 615 ac = WME_AC_VO; 616 goto done; 617 } 618 /* 619 * Non-qos traffic goes to BE. 620 */ 621 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 622 ac = WME_AC_BE; 623 goto done; 624 } 625 626 /* 627 * If node has a vlan tag then all traffic 628 * to it must have a matching tag. 629 */ 630 v_wme_ac = 0; 631 if (ni->ni_vlan != 0) { 632 if ((m->m_flags & M_VLANTAG) == 0) { 633 IEEE80211_NODE_STAT(ni, tx_novlantag); 634 return 1; 635 } 636 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 637 EVL_VLANOFTAG(ni->ni_vlan)) { 638 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 639 return 1; 640 } 641 /* map vlan priority to AC */ 642 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 643 } 644 645#ifdef INET 646 if (eh->ether_type == htons(ETHERTYPE_IP)) { 647 uint8_t tos; 648 /* 649 * IP frame, map the DSCP bits from the TOS field. 650 */ 651 /* XXX m_copydata may be too slow for fast path */ 652 /* NB: ip header may not be in first mbuf */ 653 m_copydata(m, sizeof(struct ether_header) + 654 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 655 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 656 d_wme_ac = TID_TO_WME_AC(tos); 657 } else { 658#endif /* INET */ 659 d_wme_ac = WME_AC_BE; 660#ifdef INET 661 } 662#endif 663 /* 664 * Use highest priority AC. 665 */ 666 if (v_wme_ac > d_wme_ac) 667 ac = v_wme_ac; 668 else 669 ac = d_wme_ac; 670 671 /* 672 * Apply ACM policy. 673 */ 674 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 675 static const int acmap[4] = { 676 WME_AC_BK, /* WME_AC_BE */ 677 WME_AC_BK, /* WME_AC_BK */ 678 WME_AC_BE, /* WME_AC_VI */ 679 WME_AC_VI, /* WME_AC_VO */ 680 }; 681 struct ieee80211com *ic = ni->ni_ic; 682 683 while (ac != WME_AC_BK && 684 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 685 ac = acmap[ac]; 686 } 687done: 688 M_WME_SETAC(m, ac); 689 return 0; 690} 691 692/* 693 * Insure there is sufficient contiguous space to encapsulate the 694 * 802.11 data frame. If room isn't already there, arrange for it. 695 * Drivers and cipher modules assume we have done the necessary work 696 * and fail rudely if they don't find the space they need. 697 */ 698static struct mbuf * 699ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 700 struct ieee80211_key *key, struct mbuf *m) 701{ 702#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 703 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 704 705 if (key != NULL) { 706 /* XXX belongs in crypto code? */ 707 needed_space += key->wk_cipher->ic_header; 708 /* XXX frags */ 709 /* 710 * When crypto is being done in the host we must insure 711 * the data are writable for the cipher routines; clone 712 * a writable mbuf chain. 713 * XXX handle SWMIC specially 714 */ 715 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 716 m = m_unshare(m, M_NOWAIT); 717 if (m == NULL) { 718 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 719 "%s: cannot get writable mbuf\n", __func__); 720 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 721 return NULL; 722 } 723 } 724 } 725 /* 726 * We know we are called just before stripping an Ethernet 727 * header and prepending an LLC header. This means we know 728 * there will be 729 * sizeof(struct ether_header) - sizeof(struct llc) 730 * bytes recovered to which we need additional space for the 731 * 802.11 header and any crypto header. 732 */ 733 /* XXX check trailing space and copy instead? */ 734 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 735 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 736 if (n == NULL) { 737 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 738 "%s: cannot expand storage\n", __func__); 739 vap->iv_stats.is_tx_nobuf++; 740 m_freem(m); 741 return NULL; 742 } 743 KASSERT(needed_space <= MHLEN, 744 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 745 /* 746 * Setup new mbuf to have leading space to prepend the 747 * 802.11 header and any crypto header bits that are 748 * required (the latter are added when the driver calls 749 * back to ieee80211_crypto_encap to do crypto encapsulation). 750 */ 751 /* NB: must be first 'cuz it clobbers m_data */ 752 m_move_pkthdr(n, m); 753 n->m_len = 0; /* NB: m_gethdr does not set */ 754 n->m_data += needed_space; 755 /* 756 * Pull up Ethernet header to create the expected layout. 757 * We could use m_pullup but that's overkill (i.e. we don't 758 * need the actual data) and it cannot fail so do it inline 759 * for speed. 760 */ 761 /* NB: struct ether_header is known to be contiguous */ 762 n->m_len += sizeof(struct ether_header); 763 m->m_len -= sizeof(struct ether_header); 764 m->m_data += sizeof(struct ether_header); 765 /* 766 * Replace the head of the chain. 767 */ 768 n->m_next = m; 769 m = n; 770 } 771 return m; 772#undef TO_BE_RECLAIMED 773} 774 775/* 776 * Return the transmit key to use in sending a unicast frame. 777 * If a unicast key is set we use that. When no unicast key is set 778 * we fall back to the default transmit key. 779 */ 780static __inline struct ieee80211_key * 781ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 782 struct ieee80211_node *ni) 783{ 784 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 785 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 786 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 787 return NULL; 788 return &vap->iv_nw_keys[vap->iv_def_txkey]; 789 } else { 790 return &ni->ni_ucastkey; 791 } 792} 793 794/* 795 * Return the transmit key to use in sending a multicast frame. 796 * Multicast traffic always uses the group key which is installed as 797 * the default tx key. 798 */ 799static __inline struct ieee80211_key * 800ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 801 struct ieee80211_node *ni) 802{ 803 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 804 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 805 return NULL; 806 return &vap->iv_nw_keys[vap->iv_def_txkey]; 807} 808 809/* 810 * Encapsulate an outbound data frame. The mbuf chain is updated. 811 * If an error is encountered NULL is returned. The caller is required 812 * to provide a node reference and pullup the ethernet header in the 813 * first mbuf. 814 * 815 * NB: Packet is assumed to be processed by ieee80211_classify which 816 * marked EAPOL frames w/ M_EAPOL. 817 */ 818struct mbuf * 819ieee80211_encap(struct ieee80211_node *ni, struct mbuf *m) 820{ 821#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 822 struct ieee80211vap *vap = ni->ni_vap; 823 struct ieee80211com *ic = ni->ni_ic; 824 struct ether_header eh; 825 struct ieee80211_frame *wh; 826 struct ieee80211_key *key; 827 struct llc *llc; 828 int hdrsize, hdrspace, datalen, addqos, txfrag, isff, is4addr; 829 830 /* 831 * Copy existing Ethernet header to a safe place. The 832 * rest of the code assumes it's ok to strip it when 833 * reorganizing state for the final encapsulation. 834 */ 835 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 836 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 837 838 /* 839 * Insure space for additional headers. First identify 840 * transmit key to use in calculating any buffer adjustments 841 * required. This is also used below to do privacy 842 * encapsulation work. Then calculate the 802.11 header 843 * size and any padding required by the driver. 844 * 845 * Note key may be NULL if we fall back to the default 846 * transmit key and that is not set. In that case the 847 * buffer may not be expanded as needed by the cipher 848 * routines, but they will/should discard it. 849 */ 850 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 851 if (vap->iv_opmode == IEEE80211_M_STA || 852 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 853 (vap->iv_opmode == IEEE80211_M_WDS && 854 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 855 key = ieee80211_crypto_getucastkey(vap, ni); 856 else 857 key = ieee80211_crypto_getmcastkey(vap, ni); 858 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 859 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 860 eh.ether_dhost, 861 "no default transmit key (%s) deftxkey %u", 862 __func__, vap->iv_def_txkey); 863 vap->iv_stats.is_tx_nodefkey++; 864 goto bad; 865 } 866 } else 867 key = NULL; 868 /* 869 * XXX Some ap's don't handle QoS-encapsulated EAPOL 870 * frames so suppress use. This may be an issue if other 871 * ap's require all data frames to be QoS-encapsulated 872 * once negotiated in which case we'll need to make this 873 * configurable. 874 */ 875 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 876 (m->m_flags & M_EAPOL) == 0; 877 if (addqos) 878 hdrsize = sizeof(struct ieee80211_qosframe); 879 else 880 hdrsize = sizeof(struct ieee80211_frame); 881 /* 882 * 4-address frames need to be generated for: 883 * o packets sent through a WDS vap (M_WDS || IEEE80211_M_WDS) 884 * o packets relayed by a station operating with dynamic WDS 885 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 886 */ 887 is4addr = (m->m_flags & M_WDS) || 888 vap->iv_opmode == IEEE80211_M_WDS || /* XXX redundant? */ 889 (vap->iv_opmode == IEEE80211_M_STA && 890 (vap->iv_flags & IEEE80211_F_DWDS) && 891 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 892 if (is4addr) 893 hdrsize += IEEE80211_ADDR_LEN; 894 /* 895 * Honor driver DATAPAD requirement. 896 */ 897 if (ic->ic_flags & IEEE80211_F_DATAPAD) 898 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 899 else 900 hdrspace = hdrsize; 901 902 if ((isff = m->m_flags & M_FF) != 0) { 903 struct mbuf *m2; 904 struct ether_header eh2; 905 906 /* 907 * Fast frame encapsulation. There must be two packets 908 * chained with m_nextpkt. We do header adjustment for 909 * each, add the tunnel encapsulation, and then concatenate 910 * the mbuf chains to form a single frame for transmission. 911 */ 912 m2 = m->m_nextpkt; 913 if (m2 == NULL) { 914 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 915 "%s: only one frame\n", __func__); 916 goto bad; 917 } 918 m->m_nextpkt = NULL; 919 /* 920 * Include fast frame headers in adjusting header 921 * layout; this allocates space according to what 922 * ieee80211_encap_fastframe will do. 923 */ 924 m = ieee80211_mbuf_adjust(vap, 925 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 926 sizeof(struct ether_header), 927 key, m); 928 if (m == NULL) { 929 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 930 m_freem(m2); 931 goto bad; 932 } 933 /* 934 * Copy second frame's Ethernet header out of line 935 * and adjust for encapsulation headers. Note that 936 * we make room for padding in case there isn't room 937 * at the end of first frame. 938 */ 939 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 940 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 941 m2 = ieee80211_mbuf_adjust(vap, 942 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 943 NULL, m2); 944 if (m2 == NULL) { 945 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 946 goto bad; 947 } 948 m = ieee80211_encap_fastframe(vap, m, &eh, m2, &eh2); 949 if (m == NULL) 950 goto bad; 951 } else { 952 /* 953 * Normal frame. 954 */ 955 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 956 if (m == NULL) { 957 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 958 goto bad; 959 } 960 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 961 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 962 llc = mtod(m, struct llc *); 963 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 964 llc->llc_control = LLC_UI; 965 llc->llc_snap.org_code[0] = 0; 966 llc->llc_snap.org_code[1] = 0; 967 llc->llc_snap.org_code[2] = 0; 968 llc->llc_snap.ether_type = eh.ether_type; 969 } 970 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 971 972 M_PREPEND(m, hdrspace, M_DONTWAIT); 973 if (m == NULL) { 974 vap->iv_stats.is_tx_nobuf++; 975 goto bad; 976 } 977 wh = mtod(m, struct ieee80211_frame *); 978 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 979 *(uint16_t *)wh->i_dur = 0; 980 if (is4addr) { 981 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 982 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 983 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 984 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 985 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 986 } else switch (vap->iv_opmode) { 987 case IEEE80211_M_STA: 988 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 989 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 990 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 991 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 992 break; 993 case IEEE80211_M_IBSS: 994 case IEEE80211_M_AHDEMO: 995 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 996 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 997 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 998 /* 999 * NB: always use the bssid from iv_bss as the 1000 * neighbor's may be stale after an ibss merge 1001 */ 1002 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1003 break; 1004 case IEEE80211_M_HOSTAP: 1005 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1006 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1007 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1008 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1009 break; 1010 case IEEE80211_M_MONITOR: 1011 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1012 goto bad; 1013 } 1014 if (m->m_flags & M_MORE_DATA) 1015 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1016 if (addqos) { 1017 uint8_t *qos; 1018 int ac, tid; 1019 1020 if (is4addr) { 1021 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1022 } else 1023 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1024 ac = M_WME_GETAC(m); 1025 /* map from access class/queue to 11e header priorty value */ 1026 tid = WME_AC_TO_TID(ac); 1027 qos[0] = tid & IEEE80211_QOS_TID; 1028 /* 1029 * Check if A-MPDU tx aggregation is setup or if we 1030 * should try to enable it. The sta must be associated 1031 * with HT and A-MPDU enabled for use. When the policy 1032 * routine decides we should enable A-MPDU we issue an 1033 * ADDBA request and wait for a reply. The frame being 1034 * encapsulated will go out w/o using A-MPDU, or possibly 1035 * it might be collected by the driver and held/retransmit. 1036 * The default ic_ampdu_enable routine handles staggering 1037 * ADDBA requests in case the receiver NAK's us or we are 1038 * otherwise unable to establish a BA stream. 1039 */ 1040 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1041 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1042 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1043 1044 ieee80211_txampdu_count_packet(tap); 1045 if (IEEE80211_AMPDU_RUNNING(tap)) { 1046 /* 1047 * Operational, mark frame for aggregation. 1048 * 1049 * NB: We support only immediate BA's for 1050 * AMPDU which means we set the QoS control 1051 * field to "normal ack" (0) to get "implicit 1052 * block ack" behaviour. 1053 */ 1054 m->m_flags |= M_AMPDU_MPDU; 1055 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1056 ic->ic_ampdu_enable(ni, tap)) { 1057 /* 1058 * Not negotiated yet, request service. 1059 */ 1060 ieee80211_ampdu_request(ni, tap); 1061 } 1062 } 1063 /* XXX works even when BA marked above */ 1064 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1065 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1066 qos[1] = 0; 1067 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1068 1069 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1070 /* 1071 * NB: don't assign a sequence # to potential 1072 * aggregates; we expect this happens at the 1073 * point the frame comes off any aggregation q 1074 * as otherwise we may introduce holes in the 1075 * BA sequence space and/or make window accouting 1076 * more difficult. 1077 * 1078 * XXX may want to control this with a driver 1079 * capability; this may also change when we pull 1080 * aggregation up into net80211 1081 */ 1082 *(uint16_t *)wh->i_seq = 1083 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1084 ni->ni_txseqs[tid]++; 1085 } 1086 } else { 1087 *(uint16_t *)wh->i_seq = 1088 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1089 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1090 } 1091 /* check if xmit fragmentation is required */ 1092 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1093 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1094 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1095 !isff); /* NB: don't fragment ff's */ 1096 if (key != NULL) { 1097 /* 1098 * IEEE 802.1X: send EAPOL frames always in the clear. 1099 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1100 */ 1101 if ((m->m_flags & M_EAPOL) == 0 || 1102 ((vap->iv_flags & IEEE80211_F_WPA) && 1103 (vap->iv_opmode == IEEE80211_M_STA ? 1104 !IEEE80211_KEY_UNDEFINED(key) : 1105 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1106 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1107 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1108 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1109 eh.ether_dhost, 1110 "%s", "enmic failed, discard frame"); 1111 vap->iv_stats.is_crypto_enmicfail++; 1112 goto bad; 1113 } 1114 } 1115 } 1116 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1117 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1118 goto bad; 1119 1120 IEEE80211_NODE_STAT(ni, tx_data); 1121 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1122 IEEE80211_NODE_STAT(ni, tx_mcast); 1123 else 1124 IEEE80211_NODE_STAT(ni, tx_ucast); 1125 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1126 1127 /* XXX fragmented frames not handled */ 1128 if (bpf_peers_present(vap->iv_rawbpf)) 1129 bpf_mtap(vap->iv_rawbpf, m); 1130 1131 return m; 1132bad: 1133 if (m != NULL) 1134 m_freem(m); 1135 return NULL; 1136#undef WH4 1137} 1138 1139/* 1140 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1141 * tunnel encapsulation. The frame is assumed to have an Ethernet 1142 * header at the front that must be stripped before prepending the 1143 * LLC followed by the Ethernet header passed in (with an Ethernet 1144 * type that specifies the payload size). 1145 */ 1146static struct mbuf * 1147ieee80211_encap1(struct ieee80211vap *vap, struct mbuf *m, 1148 const struct ether_header *eh) 1149{ 1150 struct llc *llc; 1151 uint16_t payload; 1152 1153 /* XXX optimize by combining m_adj+M_PREPEND */ 1154 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1155 llc = mtod(m, struct llc *); 1156 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1157 llc->llc_control = LLC_UI; 1158 llc->llc_snap.org_code[0] = 0; 1159 llc->llc_snap.org_code[1] = 0; 1160 llc->llc_snap.org_code[2] = 0; 1161 llc->llc_snap.ether_type = eh->ether_type; 1162 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1163 1164 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1165 if (m == NULL) { /* XXX cannot happen */ 1166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1167 "%s: no space for ether_header\n", __func__); 1168 vap->iv_stats.is_tx_nobuf++; 1169 return NULL; 1170 } 1171 ETHER_HEADER_COPY(mtod(m, void *), eh); 1172 mtod(m, struct ether_header *)->ether_type = htons(payload); 1173 return m; 1174} 1175 1176/* 1177 * Do fast frame tunnel encapsulation. The two frames and 1178 * Ethernet headers are supplied. The caller is assumed to 1179 * have arrange for space in the mbuf chains for encapsulating 1180 * headers (to avoid major mbuf fragmentation). 1181 * 1182 * The encapsulated frame is returned or NULL if there is a 1183 * problem (should not happen). 1184 */ 1185static struct mbuf * 1186ieee80211_encap_fastframe(struct ieee80211vap *vap, 1187 struct mbuf *m1, const struct ether_header *eh1, 1188 struct mbuf *m2, const struct ether_header *eh2) 1189{ 1190 struct llc *llc; 1191 struct mbuf *m; 1192 int pad; 1193 1194 /* 1195 * First, each frame gets a standard encapsulation. 1196 */ 1197 m1 = ieee80211_encap1(vap, m1, eh1); 1198 if (m1 == NULL) { 1199 m_freem(m2); 1200 return NULL; 1201 } 1202 m2 = ieee80211_encap1(vap, m2, eh2); 1203 if (m2 == NULL) { 1204 m_freem(m1); 1205 return NULL; 1206 } 1207 1208 /* 1209 * Pad leading frame to a 4-byte boundary. If there 1210 * is space at the end of the first frame, put it 1211 * there; otherwise prepend to the front of the second 1212 * frame. We know doing the second will always work 1213 * because we reserve space above. We prefer appending 1214 * as this typically has better DMA alignment properties. 1215 */ 1216 for (m = m1; m->m_next != NULL; m = m->m_next) 1217 ; 1218 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1219 if (pad) { 1220 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1221 m2->m_data -= pad; 1222 m2->m_len += pad; 1223 m2->m_pkthdr.len += pad; 1224 } else { /* append to first */ 1225 m->m_len += pad; 1226 m1->m_pkthdr.len += pad; 1227 } 1228 } 1229 1230 /* 1231 * Now, stick 'em together and prepend the tunnel headers; 1232 * first the Atheros tunnel header (all zero for now) and 1233 * then a special fast frame LLC. 1234 * 1235 * XXX optimize by prepending together 1236 */ 1237 m->m_next = m2; /* NB: last mbuf from above */ 1238 m1->m_pkthdr.len += m2->m_pkthdr.len; 1239 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1240 if (m1 == NULL) { /* XXX cannot happen */ 1241 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1242 "%s: no space for tunnel header\n", __func__); 1243 vap->iv_stats.is_tx_nobuf++; 1244 return NULL; 1245 } 1246 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1247 1248 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1249 if (m1 == NULL) { /* XXX cannot happen */ 1250 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1251 "%s: no space for llc header\n", __func__); 1252 vap->iv_stats.is_tx_nobuf++; 1253 return NULL; 1254 } 1255 llc = mtod(m1, struct llc *); 1256 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1257 llc->llc_control = LLC_UI; 1258 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1259 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1260 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1261 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1262 1263 vap->iv_stats.is_ff_encap++; 1264 1265 return m1; 1266} 1267 1268/* 1269 * Fragment the frame according to the specified mtu. 1270 * The size of the 802.11 header (w/o padding) is provided 1271 * so we don't need to recalculate it. We create a new 1272 * mbuf for each fragment and chain it through m_nextpkt; 1273 * we might be able to optimize this by reusing the original 1274 * packet's mbufs but that is significantly more complicated. 1275 */ 1276static int 1277ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1278 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1279{ 1280 struct ieee80211_frame *wh, *whf; 1281 struct mbuf *m, *prev, *next; 1282 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1283 1284 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1285 KASSERT(m0->m_pkthdr.len > mtu, 1286 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1287 1288 wh = mtod(m0, struct ieee80211_frame *); 1289 /* NB: mark the first frag; it will be propagated below */ 1290 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1291 totalhdrsize = hdrsize + ciphdrsize; 1292 fragno = 1; 1293 off = mtu - ciphdrsize; 1294 remainder = m0->m_pkthdr.len - off; 1295 prev = m0; 1296 do { 1297 fragsize = totalhdrsize + remainder; 1298 if (fragsize > mtu) 1299 fragsize = mtu; 1300 /* XXX fragsize can be >2048! */ 1301 KASSERT(fragsize < MCLBYTES, 1302 ("fragment size %u too big!", fragsize)); 1303 if (fragsize > MHLEN) 1304 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1305 else 1306 m = m_gethdr(M_DONTWAIT, MT_DATA); 1307 if (m == NULL) 1308 goto bad; 1309 /* leave room to prepend any cipher header */ 1310 m_align(m, fragsize - ciphdrsize); 1311 1312 /* 1313 * Form the header in the fragment. Note that since 1314 * we mark the first fragment with the MORE_FRAG bit 1315 * it automatically is propagated to each fragment; we 1316 * need only clear it on the last fragment (done below). 1317 */ 1318 whf = mtod(m, struct ieee80211_frame *); 1319 memcpy(whf, wh, hdrsize); 1320 *(uint16_t *)&whf->i_seq[0] |= htole16( 1321 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1322 IEEE80211_SEQ_FRAG_SHIFT); 1323 fragno++; 1324 1325 payload = fragsize - totalhdrsize; 1326 /* NB: destination is known to be contiguous */ 1327 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1328 m->m_len = hdrsize + payload; 1329 m->m_pkthdr.len = hdrsize + payload; 1330 m->m_flags |= M_FRAG; 1331 1332 /* chain up the fragment */ 1333 prev->m_nextpkt = m; 1334 prev = m; 1335 1336 /* deduct fragment just formed */ 1337 remainder -= payload; 1338 off += payload; 1339 } while (remainder != 0); 1340 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1341 1342 /* strip first mbuf now that everything has been copied */ 1343 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1344 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1345 1346 vap->iv_stats.is_tx_fragframes++; 1347 vap->iv_stats.is_tx_frags += fragno-1; 1348 1349 return 1; 1350bad: 1351 /* reclaim fragments but leave original frame for caller to free */ 1352 for (m = m0->m_nextpkt; m != NULL; m = next) { 1353 next = m->m_nextpkt; 1354 m->m_nextpkt = NULL; /* XXX paranoid */ 1355 m_freem(m); 1356 } 1357 m0->m_nextpkt = NULL; 1358 return 0; 1359} 1360 1361/* 1362 * Add a supported rates element id to a frame. 1363 */ 1364static uint8_t * 1365ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1366{ 1367 int nrates; 1368 1369 *frm++ = IEEE80211_ELEMID_RATES; 1370 nrates = rs->rs_nrates; 1371 if (nrates > IEEE80211_RATE_SIZE) 1372 nrates = IEEE80211_RATE_SIZE; 1373 *frm++ = nrates; 1374 memcpy(frm, rs->rs_rates, nrates); 1375 return frm + nrates; 1376} 1377 1378/* 1379 * Add an extended supported rates element id to a frame. 1380 */ 1381static uint8_t * 1382ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1383{ 1384 /* 1385 * Add an extended supported rates element if operating in 11g mode. 1386 */ 1387 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1388 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1389 *frm++ = IEEE80211_ELEMID_XRATES; 1390 *frm++ = nrates; 1391 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1392 frm += nrates; 1393 } 1394 return frm; 1395} 1396 1397/* 1398 * Add an ssid element to a frame. 1399 */ 1400static uint8_t * 1401ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1402{ 1403 *frm++ = IEEE80211_ELEMID_SSID; 1404 *frm++ = len; 1405 memcpy(frm, ssid, len); 1406 return frm + len; 1407} 1408 1409/* 1410 * Add an erp element to a frame. 1411 */ 1412static uint8_t * 1413ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1414{ 1415 uint8_t erp; 1416 1417 *frm++ = IEEE80211_ELEMID_ERP; 1418 *frm++ = 1; 1419 erp = 0; 1420 if (ic->ic_nonerpsta != 0) 1421 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1422 if (ic->ic_flags & IEEE80211_F_USEPROT) 1423 erp |= IEEE80211_ERP_USE_PROTECTION; 1424 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1425 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1426 *frm++ = erp; 1427 return frm; 1428} 1429 1430/* 1431 * Add a CFParams element to a frame. 1432 */ 1433static uint8_t * 1434ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1435{ 1436#define ADDSHORT(frm, v) do { \ 1437 frm[0] = (v) & 0xff; \ 1438 frm[1] = (v) >> 8; \ 1439 frm += 2; \ 1440} while (0) 1441 *frm++ = IEEE80211_ELEMID_CFPARMS; 1442 *frm++ = 6; 1443 *frm++ = 0; /* CFP count */ 1444 *frm++ = 2; /* CFP period */ 1445 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1446 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1447 return frm; 1448#undef ADDSHORT 1449} 1450 1451static __inline uint8_t * 1452add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1453{ 1454 memcpy(frm, ie->ie_data, ie->ie_len); 1455 return frm + ie->ie_len; 1456} 1457 1458static __inline uint8_t * 1459add_ie(uint8_t *frm, const uint8_t *ie) 1460{ 1461 memcpy(frm, ie, 2 + ie[1]); 1462 return frm + 2 + ie[1]; 1463} 1464 1465#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1466/* 1467 * Add a WME information element to a frame. 1468 */ 1469static uint8_t * 1470ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1471{ 1472 static const struct ieee80211_wme_info info = { 1473 .wme_id = IEEE80211_ELEMID_VENDOR, 1474 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1475 .wme_oui = { WME_OUI_BYTES }, 1476 .wme_type = WME_OUI_TYPE, 1477 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1478 .wme_version = WME_VERSION, 1479 .wme_info = 0, 1480 }; 1481 memcpy(frm, &info, sizeof(info)); 1482 return frm + sizeof(info); 1483} 1484 1485/* 1486 * Add a WME parameters element to a frame. 1487 */ 1488static uint8_t * 1489ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1490{ 1491#define SM(_v, _f) (((_v) << _f##_S) & _f) 1492#define ADDSHORT(frm, v) do { \ 1493 frm[0] = (v) & 0xff; \ 1494 frm[1] = (v) >> 8; \ 1495 frm += 2; \ 1496} while (0) 1497 /* NB: this works 'cuz a param has an info at the front */ 1498 static const struct ieee80211_wme_info param = { 1499 .wme_id = IEEE80211_ELEMID_VENDOR, 1500 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1501 .wme_oui = { WME_OUI_BYTES }, 1502 .wme_type = WME_OUI_TYPE, 1503 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1504 .wme_version = WME_VERSION, 1505 }; 1506 int i; 1507 1508 memcpy(frm, ¶m, sizeof(param)); 1509 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1510 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1511 *frm++ = 0; /* reserved field */ 1512 for (i = 0; i < WME_NUM_AC; i++) { 1513 const struct wmeParams *ac = 1514 &wme->wme_bssChanParams.cap_wmeParams[i]; 1515 *frm++ = SM(i, WME_PARAM_ACI) 1516 | SM(ac->wmep_acm, WME_PARAM_ACM) 1517 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1518 ; 1519 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1520 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1521 ; 1522 ADDSHORT(frm, ac->wmep_txopLimit); 1523 } 1524 return frm; 1525#undef SM 1526#undef ADDSHORT 1527} 1528#undef WME_OUI_BYTES 1529 1530#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1531/* 1532 * Add a WME information element to a frame. 1533 */ 1534static uint8_t * 1535ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1536{ 1537 static const struct ieee80211_ath_ie info = { 1538 .ath_id = IEEE80211_ELEMID_VENDOR, 1539 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1540 .ath_oui = { ATH_OUI_BYTES }, 1541 .ath_oui_type = ATH_OUI_TYPE, 1542 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1543 .ath_version = ATH_OUI_VERSION, 1544 }; 1545 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1546 1547 memcpy(frm, &info, sizeof(info)); 1548 ath->ath_capability = caps; 1549 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1550 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1551 return frm + sizeof(info); 1552} 1553#undef ATH_OUI_BYTES 1554 1555/* 1556 * Add an 11h Power Constraint element to a frame. 1557 */ 1558static uint8_t * 1559ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1560{ 1561 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1562 /* XXX per-vap tx power limit? */ 1563 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1564 1565 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1566 frm[1] = 1; 1567 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1568 return frm + 3; 1569} 1570 1571/* 1572 * Add an 11h Power Capability element to a frame. 1573 */ 1574static uint8_t * 1575ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1576{ 1577 frm[0] = IEEE80211_ELEMID_PWRCAP; 1578 frm[1] = 2; 1579 frm[2] = c->ic_minpower; 1580 frm[3] = c->ic_maxpower; 1581 return frm + 4; 1582} 1583 1584/* 1585 * Add an 11h Supported Channels element to a frame. 1586 */ 1587static uint8_t * 1588ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1589{ 1590 static const int ielen = 26; 1591 1592 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1593 frm[1] = ielen; 1594 /* XXX not correct */ 1595 memcpy(frm+2, ic->ic_chan_avail, ielen); 1596 return frm + 2 + ielen; 1597} 1598 1599/* 1600 * Add an 11h Channel Switch Announcement element to a frame. 1601 * Note that we use the per-vap CSA count to adjust the global 1602 * counter so we can use this routine to form probe response 1603 * frames and get the current count. 1604 */ 1605static uint8_t * 1606ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1607{ 1608 struct ieee80211com *ic = vap->iv_ic; 1609 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1610 1611 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1612 csa->csa_len = 3; 1613 csa->csa_mode = 1; /* XXX force quiet on channel */ 1614 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1615 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1616 return frm + sizeof(*csa); 1617} 1618 1619/* 1620 * Add an 11h country information element to a frame. 1621 */ 1622static uint8_t * 1623ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1624{ 1625 1626 if (ic->ic_countryie == NULL || 1627 ic->ic_countryie_chan != ic->ic_bsschan) { 1628 /* 1629 * Handle lazy construction of ie. This is done on 1630 * first use and after a channel change that requires 1631 * re-calculation. 1632 */ 1633 if (ic->ic_countryie != NULL) 1634 free(ic->ic_countryie, M_80211_NODE_IE); 1635 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1636 if (ic->ic_countryie == NULL) 1637 return frm; 1638 ic->ic_countryie_chan = ic->ic_bsschan; 1639 } 1640 return add_appie(frm, ic->ic_countryie); 1641} 1642 1643/* 1644 * Send a probe request frame with the specified ssid 1645 * and any optional information element data. 1646 */ 1647int 1648ieee80211_send_probereq(struct ieee80211_node *ni, 1649 const uint8_t sa[IEEE80211_ADDR_LEN], 1650 const uint8_t da[IEEE80211_ADDR_LEN], 1651 const uint8_t bssid[IEEE80211_ADDR_LEN], 1652 const uint8_t *ssid, size_t ssidlen) 1653{ 1654 struct ieee80211vap *vap = ni->ni_vap; 1655 struct ieee80211com *ic = ni->ni_ic; 1656 struct ieee80211_frame *wh; 1657 const struct ieee80211_rateset *rs; 1658 struct mbuf *m; 1659 uint8_t *frm; 1660 1661 if (vap->iv_state == IEEE80211_S_CAC) { 1662 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1663 "block %s frame in CAC state", "probe request"); 1664 vap->iv_stats.is_tx_badstate++; 1665 return EIO; /* XXX */ 1666 } 1667 1668 /* 1669 * Hold a reference on the node so it doesn't go away until after 1670 * the xmit is complete all the way in the driver. On error we 1671 * will remove our reference. 1672 */ 1673 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1674 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1675 __func__, __LINE__, 1676 ni, ether_sprintf(ni->ni_macaddr), 1677 ieee80211_node_refcnt(ni)+1); 1678 ieee80211_ref_node(ni); 1679 1680 /* 1681 * prreq frame format 1682 * [tlv] ssid 1683 * [tlv] supported rates 1684 * [tlv] RSN (optional) 1685 * [tlv] extended supported rates 1686 * [tlv] WPA (optional) 1687 * [tlv] user-specified ie's 1688 */ 1689 m = ieee80211_getmgtframe(&frm, 1690 ic->ic_headroom + sizeof(struct ieee80211_frame), 1691 2 + IEEE80211_NWID_LEN 1692 + 2 + IEEE80211_RATE_SIZE 1693 + sizeof(struct ieee80211_ie_wpa) 1694 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1695 + sizeof(struct ieee80211_ie_wpa) 1696 + (vap->iv_appie_probereq != NULL ? 1697 vap->iv_appie_probereq->ie_len : 0) 1698 ); 1699 if (m == NULL) { 1700 vap->iv_stats.is_tx_nobuf++; 1701 ieee80211_free_node(ni); 1702 return ENOMEM; 1703 } 1704 1705 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1706 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1707 frm = ieee80211_add_rates(frm, rs); 1708 if (vap->iv_flags & IEEE80211_F_WPA2) { 1709 if (vap->iv_rsn_ie != NULL) 1710 frm = add_ie(frm, vap->iv_rsn_ie); 1711 /* XXX else complain? */ 1712 } 1713 frm = ieee80211_add_xrates(frm, rs); 1714 if (vap->iv_flags & IEEE80211_F_WPA1) { 1715 if (vap->iv_wpa_ie != NULL) 1716 frm = add_ie(frm, vap->iv_wpa_ie); 1717 /* XXX else complain? */ 1718 } 1719 if (vap->iv_appie_probereq != NULL) 1720 frm = add_appie(frm, vap->iv_appie_probereq); 1721 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1722 1723 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1724 if (m == NULL) 1725 return ENOMEM; 1726 1727 wh = mtod(m, struct ieee80211_frame *); 1728 ieee80211_send_setup(ni, wh, 1729 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1730 sa, da, bssid); 1731 /* XXX power management? */ 1732 1733 M_WME_SETAC(m, WME_AC_BE); 1734 1735 IEEE80211_NODE_STAT(ni, tx_probereq); 1736 IEEE80211_NODE_STAT(ni, tx_mgmt); 1737 1738 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1739 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1740 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1741 ssidlen, ssid); 1742 1743 return ic->ic_raw_xmit(ni, m, NULL); 1744} 1745 1746/* 1747 * Calculate capability information for mgt frames. 1748 */ 1749static uint16_t 1750getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1751{ 1752 struct ieee80211com *ic = vap->iv_ic; 1753 uint16_t capinfo; 1754 1755 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1756 1757 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1758 capinfo = IEEE80211_CAPINFO_ESS; 1759 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1760 capinfo = IEEE80211_CAPINFO_IBSS; 1761 else 1762 capinfo = 0; 1763 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1764 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1765 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1766 IEEE80211_IS_CHAN_2GHZ(chan)) 1767 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1768 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1769 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1770 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1771 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1772 return capinfo; 1773} 1774 1775/* 1776 * Send a management frame. The node is for the destination (or ic_bss 1777 * when in station mode). Nodes other than ic_bss have their reference 1778 * count bumped to reflect our use for an indeterminant time. 1779 */ 1780int 1781ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1782{ 1783#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1784#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1785 struct ieee80211vap *vap = ni->ni_vap; 1786 struct ieee80211com *ic = ni->ni_ic; 1787 struct ieee80211_node *bss = vap->iv_bss; 1788 struct mbuf *m; 1789 uint8_t *frm; 1790 uint16_t capinfo; 1791 int has_challenge, is_shared_key, ret, status; 1792 1793 KASSERT(ni != NULL, ("null node")); 1794 1795 /* 1796 * Hold a reference on the node so it doesn't go away until after 1797 * the xmit is complete all the way in the driver. On error we 1798 * will remove our reference. 1799 */ 1800 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1801 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1802 __func__, __LINE__, 1803 ni, ether_sprintf(ni->ni_macaddr), 1804 ieee80211_node_refcnt(ni)+1); 1805 ieee80211_ref_node(ni); 1806 1807 switch (type) { 1808 1809 case IEEE80211_FC0_SUBTYPE_AUTH: 1810 status = arg >> 16; 1811 arg &= 0xffff; 1812 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1813 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1814 ni->ni_challenge != NULL); 1815 1816 /* 1817 * Deduce whether we're doing open authentication or 1818 * shared key authentication. We do the latter if 1819 * we're in the middle of a shared key authentication 1820 * handshake or if we're initiating an authentication 1821 * request and configured to use shared key. 1822 */ 1823 is_shared_key = has_challenge || 1824 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1825 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1826 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1827 1828 m = ieee80211_getmgtframe(&frm, 1829 ic->ic_headroom + sizeof(struct ieee80211_frame), 1830 3 * sizeof(uint16_t) 1831 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1832 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1833 ); 1834 if (m == NULL) 1835 senderr(ENOMEM, is_tx_nobuf); 1836 1837 ((uint16_t *)frm)[0] = 1838 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1839 : htole16(IEEE80211_AUTH_ALG_OPEN); 1840 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1841 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1842 1843 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1844 ((uint16_t *)frm)[3] = 1845 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1846 IEEE80211_ELEMID_CHALLENGE); 1847 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1848 IEEE80211_CHALLENGE_LEN); 1849 m->m_pkthdr.len = m->m_len = 1850 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1851 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1852 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1853 "request encrypt frame (%s)", __func__); 1854 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1855 } 1856 } else 1857 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1858 1859 /* XXX not right for shared key */ 1860 if (status == IEEE80211_STATUS_SUCCESS) 1861 IEEE80211_NODE_STAT(ni, tx_auth); 1862 else 1863 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1864 1865 if (vap->iv_opmode == IEEE80211_M_STA) 1866 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1867 (void *) vap->iv_state); 1868 break; 1869 1870 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1871 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1872 "send station deauthenticate (reason %d)", arg); 1873 m = ieee80211_getmgtframe(&frm, 1874 ic->ic_headroom + sizeof(struct ieee80211_frame), 1875 sizeof(uint16_t)); 1876 if (m == NULL) 1877 senderr(ENOMEM, is_tx_nobuf); 1878 *(uint16_t *)frm = htole16(arg); /* reason */ 1879 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1880 1881 IEEE80211_NODE_STAT(ni, tx_deauth); 1882 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1883 1884 ieee80211_node_unauthorize(ni); /* port closed */ 1885 break; 1886 1887 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1888 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1889 /* 1890 * asreq frame format 1891 * [2] capability information 1892 * [2] listen interval 1893 * [6*] current AP address (reassoc only) 1894 * [tlv] ssid 1895 * [tlv] supported rates 1896 * [tlv] extended supported rates 1897 * [4] power capability (optional) 1898 * [28] supported channels (optional) 1899 * [tlv] HT capabilities 1900 * [tlv] WME (optional) 1901 * [tlv] Vendor OUI HT capabilities (optional) 1902 * [tlv] Atheros capabilities (if negotiated) 1903 * [tlv] AppIE's (optional) 1904 */ 1905 m = ieee80211_getmgtframe(&frm, 1906 ic->ic_headroom + sizeof(struct ieee80211_frame), 1907 sizeof(uint16_t) 1908 + sizeof(uint16_t) 1909 + IEEE80211_ADDR_LEN 1910 + 2 + IEEE80211_NWID_LEN 1911 + 2 + IEEE80211_RATE_SIZE 1912 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1913 + 4 1914 + 2 + 26 1915 + sizeof(struct ieee80211_wme_info) 1916 + sizeof(struct ieee80211_ie_htcap) 1917 + 4 + sizeof(struct ieee80211_ie_htcap) 1918 + sizeof(struct ieee80211_ath_ie) 1919 + (vap->iv_appie_wpa != NULL ? 1920 vap->iv_appie_wpa->ie_len : 0) 1921 + (vap->iv_appie_assocreq != NULL ? 1922 vap->iv_appie_assocreq->ie_len : 0) 1923 ); 1924 if (m == NULL) 1925 senderr(ENOMEM, is_tx_nobuf); 1926 1927 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1928 ("wrong mode %u", vap->iv_opmode)); 1929 capinfo = IEEE80211_CAPINFO_ESS; 1930 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1931 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1932 /* 1933 * NB: Some 11a AP's reject the request when 1934 * short premable is set. 1935 */ 1936 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1937 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1938 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1939 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1940 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1941 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1942 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1943 (vap->iv_flags & IEEE80211_F_DOTH)) 1944 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1945 *(uint16_t *)frm = htole16(capinfo); 1946 frm += 2; 1947 1948 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1949 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1950 bss->ni_intval)); 1951 frm += 2; 1952 1953 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1954 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1955 frm += IEEE80211_ADDR_LEN; 1956 } 1957 1958 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1959 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1960 if (vap->iv_flags & IEEE80211_F_WPA2) { 1961 if (vap->iv_rsn_ie != NULL) 1962 frm = add_ie(frm, vap->iv_rsn_ie); 1963 /* XXX else complain? */ 1964 } 1965 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1966 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1967 frm = ieee80211_add_powercapability(frm, 1968 ic->ic_curchan); 1969 frm = ieee80211_add_supportedchannels(frm, ic); 1970 } 1971 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1972 ni->ni_ies.htcap_ie != NULL && 1973 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1974 frm = ieee80211_add_htcap(frm, ni); 1975 if (vap->iv_flags & IEEE80211_F_WPA1) { 1976 if (vap->iv_wpa_ie != NULL) 1977 frm = add_ie(frm, vap->iv_wpa_ie); 1978 /* XXX else complain */ 1979 } 1980 if ((ic->ic_flags & IEEE80211_F_WME) && 1981 ni->ni_ies.wme_ie != NULL) 1982 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1983 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1984 ni->ni_ies.htcap_ie != NULL && 1985 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1986 frm = ieee80211_add_htcap_vendor(frm, ni); 1987 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1988 frm = ieee80211_add_ath(frm, 1989 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1990 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 1991 ni->ni_authmode != IEEE80211_AUTH_8021X && 1992 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 1993 vap->iv_def_txkey : 0x7fff); 1994 if (vap->iv_appie_assocreq != NULL) 1995 frm = add_appie(frm, vap->iv_appie_assocreq); 1996 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1997 1998 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1999 (void *) vap->iv_state); 2000 break; 2001 2002 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2003 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2004 /* 2005 * asresp frame format 2006 * [2] capability information 2007 * [2] status 2008 * [2] association ID 2009 * [tlv] supported rates 2010 * [tlv] extended supported rates 2011 * [tlv] HT capabilities (standard, if STA enabled) 2012 * [tlv] HT information (standard, if STA enabled) 2013 * [tlv] WME (if configured and STA enabled) 2014 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2015 * [tlv] HT information (vendor OUI, if STA enabled) 2016 * [tlv] Atheros capabilities (if STA enabled) 2017 * [tlv] AppIE's (optional) 2018 */ 2019 m = ieee80211_getmgtframe(&frm, 2020 ic->ic_headroom + sizeof(struct ieee80211_frame), 2021 sizeof(uint16_t) 2022 + sizeof(uint16_t) 2023 + sizeof(uint16_t) 2024 + 2 + IEEE80211_RATE_SIZE 2025 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2026 + sizeof(struct ieee80211_ie_htcap) + 4 2027 + sizeof(struct ieee80211_ie_htinfo) + 4 2028 + sizeof(struct ieee80211_wme_param) 2029 + sizeof(struct ieee80211_ath_ie) 2030 + (vap->iv_appie_assocresp != NULL ? 2031 vap->iv_appie_assocresp->ie_len : 0) 2032 ); 2033 if (m == NULL) 2034 senderr(ENOMEM, is_tx_nobuf); 2035 2036 capinfo = getcapinfo(vap, bss->ni_chan); 2037 *(uint16_t *)frm = htole16(capinfo); 2038 frm += 2; 2039 2040 *(uint16_t *)frm = htole16(arg); /* status */ 2041 frm += 2; 2042 2043 if (arg == IEEE80211_STATUS_SUCCESS) { 2044 *(uint16_t *)frm = htole16(ni->ni_associd); 2045 IEEE80211_NODE_STAT(ni, tx_assoc); 2046 } else 2047 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2048 frm += 2; 2049 2050 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2051 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2052 /* NB: respond according to what we received */ 2053 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2054 frm = ieee80211_add_htcap(frm, ni); 2055 frm = ieee80211_add_htinfo(frm, ni); 2056 } 2057 if ((vap->iv_flags & IEEE80211_F_WME) && 2058 ni->ni_ies.wme_ie != NULL) 2059 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2060 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2061 frm = ieee80211_add_htcap_vendor(frm, ni); 2062 frm = ieee80211_add_htinfo_vendor(frm, ni); 2063 } 2064 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2065 frm = ieee80211_add_ath(frm, 2066 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2067 ni->ni_ath_defkeyix); 2068 if (vap->iv_appie_assocresp != NULL) 2069 frm = add_appie(frm, vap->iv_appie_assocresp); 2070 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2071 break; 2072 2073 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2074 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2075 "send station disassociate (reason %d)", arg); 2076 m = ieee80211_getmgtframe(&frm, 2077 ic->ic_headroom + sizeof(struct ieee80211_frame), 2078 sizeof(uint16_t)); 2079 if (m == NULL) 2080 senderr(ENOMEM, is_tx_nobuf); 2081 *(uint16_t *)frm = htole16(arg); /* reason */ 2082 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2083 2084 IEEE80211_NODE_STAT(ni, tx_disassoc); 2085 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2086 break; 2087 2088 default: 2089 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2090 "invalid mgmt frame type %u", type); 2091 senderr(EINVAL, is_tx_unknownmgt); 2092 /* NOTREACHED */ 2093 } 2094 2095 return ieee80211_mgmt_output(ni, m, type); 2096bad: 2097 ieee80211_free_node(ni); 2098 return ret; 2099#undef senderr 2100#undef HTFLAGS 2101} 2102 2103/* 2104 * Return an mbuf with a probe response frame in it. 2105 * Space is left to prepend and 802.11 header at the 2106 * front but it's left to the caller to fill in. 2107 */ 2108struct mbuf * 2109ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2110{ 2111 struct ieee80211vap *vap = bss->ni_vap; 2112 struct ieee80211com *ic = bss->ni_ic; 2113 const struct ieee80211_rateset *rs; 2114 struct mbuf *m; 2115 uint16_t capinfo; 2116 uint8_t *frm; 2117 2118 /* 2119 * probe response frame format 2120 * [8] time stamp 2121 * [2] beacon interval 2122 * [2] cabability information 2123 * [tlv] ssid 2124 * [tlv] supported rates 2125 * [tlv] parameter set (FH/DS) 2126 * [tlv] parameter set (IBSS) 2127 * [tlv] country (optional) 2128 * [3] power control (optional) 2129 * [5] channel switch announcement (CSA) (optional) 2130 * [tlv] extended rate phy (ERP) 2131 * [tlv] extended supported rates 2132 * [tlv] RSN (optional) 2133 * [tlv] HT capabilities 2134 * [tlv] HT information 2135 * [tlv] WPA (optional) 2136 * [tlv] WME (optional) 2137 * [tlv] Vendor OUI HT capabilities (optional) 2138 * [tlv] Vendor OUI HT information (optional) 2139 * [tlv] Atheros capabilities 2140 * [tlv] AppIE's (optional) 2141 */ 2142 m = ieee80211_getmgtframe(&frm, 2143 ic->ic_headroom + sizeof(struct ieee80211_frame), 2144 8 2145 + sizeof(uint16_t) 2146 + sizeof(uint16_t) 2147 + 2 + IEEE80211_NWID_LEN 2148 + 2 + IEEE80211_RATE_SIZE 2149 + 7 /* max(7,3) */ 2150 + IEEE80211_COUNTRY_MAX_SIZE 2151 + 3 2152 + sizeof(struct ieee80211_csa_ie) 2153 + 3 2154 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2155 + sizeof(struct ieee80211_ie_wpa) 2156 + sizeof(struct ieee80211_ie_htcap) 2157 + sizeof(struct ieee80211_ie_htinfo) 2158 + sizeof(struct ieee80211_ie_wpa) 2159 + sizeof(struct ieee80211_wme_param) 2160 + 4 + sizeof(struct ieee80211_ie_htcap) 2161 + 4 + sizeof(struct ieee80211_ie_htinfo) 2162 + sizeof(struct ieee80211_ath_ie) 2163 + (vap->iv_appie_proberesp != NULL ? 2164 vap->iv_appie_proberesp->ie_len : 0) 2165 ); 2166 if (m == NULL) { 2167 vap->iv_stats.is_tx_nobuf++; 2168 return NULL; 2169 } 2170 2171 memset(frm, 0, 8); /* timestamp should be filled later */ 2172 frm += 8; 2173 *(uint16_t *)frm = htole16(bss->ni_intval); 2174 frm += 2; 2175 capinfo = getcapinfo(vap, bss->ni_chan); 2176 *(uint16_t *)frm = htole16(capinfo); 2177 frm += 2; 2178 2179 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2180 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2181 frm = ieee80211_add_rates(frm, rs); 2182 2183 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2184 *frm++ = IEEE80211_ELEMID_FHPARMS; 2185 *frm++ = 5; 2186 *frm++ = bss->ni_fhdwell & 0x00ff; 2187 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2188 *frm++ = IEEE80211_FH_CHANSET( 2189 ieee80211_chan2ieee(ic, bss->ni_chan)); 2190 *frm++ = IEEE80211_FH_CHANPAT( 2191 ieee80211_chan2ieee(ic, bss->ni_chan)); 2192 *frm++ = bss->ni_fhindex; 2193 } else { 2194 *frm++ = IEEE80211_ELEMID_DSPARMS; 2195 *frm++ = 1; 2196 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2197 } 2198 2199 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2200 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2201 *frm++ = 2; 2202 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2203 } 2204 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2205 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2206 frm = ieee80211_add_countryie(frm, ic); 2207 if (vap->iv_flags & IEEE80211_F_DOTH) { 2208 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2209 frm = ieee80211_add_powerconstraint(frm, vap); 2210 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2211 frm = ieee80211_add_csa(frm, vap); 2212 } 2213 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2214 frm = ieee80211_add_erp(frm, ic); 2215 frm = ieee80211_add_xrates(frm, rs); 2216 if (vap->iv_flags & IEEE80211_F_WPA2) { 2217 if (vap->iv_rsn_ie != NULL) 2218 frm = add_ie(frm, vap->iv_rsn_ie); 2219 /* XXX else complain? */ 2220 } 2221 /* 2222 * NB: legacy 11b clients do not get certain ie's. 2223 * The caller identifies such clients by passing 2224 * a token in legacy to us. Could expand this to be 2225 * any legacy client for stuff like HT ie's. 2226 */ 2227 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2228 legacy != IEEE80211_SEND_LEGACY_11B) { 2229 frm = ieee80211_add_htcap(frm, bss); 2230 frm = ieee80211_add_htinfo(frm, bss); 2231 } 2232 if (vap->iv_flags & IEEE80211_F_WPA1) { 2233 if (vap->iv_wpa_ie != NULL) 2234 frm = add_ie(frm, vap->iv_wpa_ie); 2235 /* XXX else complain? */ 2236 } 2237 if (vap->iv_flags & IEEE80211_F_WME) 2238 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2239 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2240 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2241 legacy != IEEE80211_SEND_LEGACY_11B) { 2242 frm = ieee80211_add_htcap_vendor(frm, bss); 2243 frm = ieee80211_add_htinfo_vendor(frm, bss); 2244 } 2245 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2246 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2247 bss->ni_ath_defkeyix); 2248 if (vap->iv_appie_proberesp != NULL) 2249 frm = add_appie(frm, vap->iv_appie_proberesp); 2250 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2251 2252 return m; 2253} 2254 2255/* 2256 * Send a probe response frame to the specified mac address. 2257 * This does not go through the normal mgt frame api so we 2258 * can specify the destination address and re-use the bss node 2259 * for the sta reference. 2260 */ 2261int 2262ieee80211_send_proberesp(struct ieee80211vap *vap, 2263 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2264{ 2265 struct ieee80211_node *bss = vap->iv_bss; 2266 struct ieee80211com *ic = vap->iv_ic; 2267 struct ieee80211_frame *wh; 2268 struct mbuf *m; 2269 2270 if (vap->iv_state == IEEE80211_S_CAC) { 2271 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2272 "block %s frame in CAC state", "probe response"); 2273 vap->iv_stats.is_tx_badstate++; 2274 return EIO; /* XXX */ 2275 } 2276 2277 /* 2278 * Hold a reference on the node so it doesn't go away until after 2279 * the xmit is complete all the way in the driver. On error we 2280 * will remove our reference. 2281 */ 2282 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2283 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2284 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2285 ieee80211_node_refcnt(bss)+1); 2286 ieee80211_ref_node(bss); 2287 2288 m = ieee80211_alloc_proberesp(bss, legacy); 2289 if (m == NULL) { 2290 ieee80211_free_node(bss); 2291 return ENOMEM; 2292 } 2293 2294 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2295 KASSERT(m != NULL, ("no room for header")); 2296 2297 wh = mtod(m, struct ieee80211_frame *); 2298 ieee80211_send_setup(bss, wh, 2299 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2300 vap->iv_myaddr, da, bss->ni_bssid); 2301 /* XXX power management? */ 2302 2303 M_WME_SETAC(m, WME_AC_BE); 2304 2305 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2306 "send probe resp on channel %u to %s%s\n", 2307 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2308 legacy ? " <legacy>" : ""); 2309 IEEE80211_NODE_STAT(bss, tx_mgmt); 2310 2311 return ic->ic_raw_xmit(bss, m, NULL); 2312} 2313 2314/* 2315 * Allocate and build a RTS (Request To Send) control frame. 2316 */ 2317struct mbuf * 2318ieee80211_alloc_rts(struct ieee80211com *ic, 2319 const uint8_t ra[IEEE80211_ADDR_LEN], 2320 const uint8_t ta[IEEE80211_ADDR_LEN], 2321 uint16_t dur) 2322{ 2323 struct ieee80211_frame_rts *rts; 2324 struct mbuf *m; 2325 2326 /* XXX honor ic_headroom */ 2327 m = m_gethdr(M_DONTWAIT, MT_DATA); 2328 if (m != NULL) { 2329 rts = mtod(m, struct ieee80211_frame_rts *); 2330 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2331 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2332 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2333 *(u_int16_t *)rts->i_dur = htole16(dur); 2334 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2335 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2336 2337 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2338 } 2339 return m; 2340} 2341 2342/* 2343 * Allocate and build a CTS (Clear To Send) control frame. 2344 */ 2345struct mbuf * 2346ieee80211_alloc_cts(struct ieee80211com *ic, 2347 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2348{ 2349 struct ieee80211_frame_cts *cts; 2350 struct mbuf *m; 2351 2352 /* XXX honor ic_headroom */ 2353 m = m_gethdr(M_DONTWAIT, MT_DATA); 2354 if (m != NULL) { 2355 cts = mtod(m, struct ieee80211_frame_cts *); 2356 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2357 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2358 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2359 *(u_int16_t *)cts->i_dur = htole16(dur); 2360 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2361 2362 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2363 } 2364 return m; 2365} 2366 2367static void 2368ieee80211_tx_mgt_timeout(void *arg) 2369{ 2370 struct ieee80211_node *ni = arg; 2371 struct ieee80211vap *vap = ni->ni_vap; 2372 2373 if (vap->iv_state != IEEE80211_S_INIT && 2374 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2375 /* 2376 * NB: it's safe to specify a timeout as the reason here; 2377 * it'll only be used in the right state. 2378 */ 2379 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2380 IEEE80211_SCAN_FAIL_TIMEOUT); 2381 } 2382} 2383 2384static void 2385ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2386{ 2387 struct ieee80211vap *vap = ni->ni_vap; 2388 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2389 2390 /* 2391 * Frame transmit completed; arrange timer callback. If 2392 * transmit was successfuly we wait for response. Otherwise 2393 * we arrange an immediate callback instead of doing the 2394 * callback directly since we don't know what state the driver 2395 * is in (e.g. what locks it is holding). This work should 2396 * not be too time-critical and not happen too often so the 2397 * added overhead is acceptable. 2398 * 2399 * XXX what happens if !acked but response shows up before callback? 2400 */ 2401 if (vap->iv_state == ostate) 2402 callout_reset(&vap->iv_mgtsend, 2403 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2404 ieee80211_tx_mgt_timeout, ni); 2405} 2406 2407static void 2408ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2409 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2410{ 2411 struct ieee80211vap *vap = ni->ni_vap; 2412 struct ieee80211com *ic = ni->ni_ic; 2413 struct ieee80211_rateset *rs = &ni->ni_rates; 2414 uint16_t capinfo; 2415 2416 /* 2417 * beacon frame format 2418 * [8] time stamp 2419 * [2] beacon interval 2420 * [2] cabability information 2421 * [tlv] ssid 2422 * [tlv] supported rates 2423 * [3] parameter set (DS) 2424 * [8] CF parameter set (optional) 2425 * [tlv] parameter set (IBSS/TIM) 2426 * [tlv] country (optional) 2427 * [3] power control (optional) 2428 * [5] channel switch announcement (CSA) (optional) 2429 * [tlv] extended rate phy (ERP) 2430 * [tlv] extended supported rates 2431 * [tlv] RSN parameters 2432 * [tlv] HT capabilities 2433 * [tlv] HT information 2434 * XXX Vendor-specific OIDs (e.g. Atheros) 2435 * [tlv] WPA parameters 2436 * [tlv] WME parameters 2437 * [tlv] Vendor OUI HT capabilities (optional) 2438 * [tlv] Vendor OUI HT information (optional) 2439 * [tlv] application data (optional) 2440 */ 2441 2442 memset(bo, 0, sizeof(*bo)); 2443 2444 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2445 frm += 8; 2446 *(uint16_t *)frm = htole16(ni->ni_intval); 2447 frm += 2; 2448 capinfo = getcapinfo(vap, ni->ni_chan); 2449 bo->bo_caps = (uint16_t *)frm; 2450 *(uint16_t *)frm = htole16(capinfo); 2451 frm += 2; 2452 *frm++ = IEEE80211_ELEMID_SSID; 2453 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2454 *frm++ = ni->ni_esslen; 2455 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2456 frm += ni->ni_esslen; 2457 } else 2458 *frm++ = 0; 2459 frm = ieee80211_add_rates(frm, rs); 2460 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2461 *frm++ = IEEE80211_ELEMID_DSPARMS; 2462 *frm++ = 1; 2463 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2464 } 2465 if (ic->ic_flags & IEEE80211_F_PCF) { 2466 bo->bo_cfp = frm; 2467 frm = ieee80211_add_cfparms(frm, ic); 2468 } 2469 bo->bo_tim = frm; 2470 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2471 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2472 *frm++ = 2; 2473 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2474 bo->bo_tim_len = 0; 2475 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2476 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2477 2478 tie->tim_ie = IEEE80211_ELEMID_TIM; 2479 tie->tim_len = 4; /* length */ 2480 tie->tim_count = 0; /* DTIM count */ 2481 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2482 tie->tim_bitctl = 0; /* bitmap control */ 2483 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2484 frm += sizeof(struct ieee80211_tim_ie); 2485 bo->bo_tim_len = 1; 2486 } 2487 bo->bo_tim_trailer = frm; 2488 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2489 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2490 frm = ieee80211_add_countryie(frm, ic); 2491 if (vap->iv_flags & IEEE80211_F_DOTH) { 2492 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2493 frm = ieee80211_add_powerconstraint(frm, vap); 2494 bo->bo_csa = frm; 2495 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2496 frm = ieee80211_add_csa(frm, vap); 2497 } else 2498 bo->bo_csa = frm; 2499 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2500 bo->bo_erp = frm; 2501 frm = ieee80211_add_erp(frm, ic); 2502 } 2503 frm = ieee80211_add_xrates(frm, rs); 2504 if (vap->iv_flags & IEEE80211_F_WPA2) { 2505 if (vap->iv_rsn_ie != NULL) 2506 frm = add_ie(frm, vap->iv_rsn_ie); 2507 /* XXX else complain */ 2508 } 2509 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2510 frm = ieee80211_add_htcap(frm, ni); 2511 bo->bo_htinfo = frm; 2512 frm = ieee80211_add_htinfo(frm, ni); 2513 } 2514 if (vap->iv_flags & IEEE80211_F_WPA1) { 2515 if (vap->iv_wpa_ie != NULL) 2516 frm = add_ie(frm, vap->iv_wpa_ie); 2517 /* XXX else complain */ 2518 } 2519 if (vap->iv_flags & IEEE80211_F_WME) { 2520 bo->bo_wme = frm; 2521 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2522 } 2523 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2524 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2525 frm = ieee80211_add_htcap_vendor(frm, ni); 2526 frm = ieee80211_add_htinfo_vendor(frm, ni); 2527 } 2528 if (vap->iv_appie_beacon != NULL) { 2529 bo->bo_appie = frm; 2530 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2531 frm = add_appie(frm, vap->iv_appie_beacon); 2532 } 2533 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2534 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2535 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2536} 2537 2538/* 2539 * Allocate a beacon frame and fillin the appropriate bits. 2540 */ 2541struct mbuf * 2542ieee80211_beacon_alloc(struct ieee80211_node *ni, 2543 struct ieee80211_beacon_offsets *bo) 2544{ 2545 struct ieee80211vap *vap = ni->ni_vap; 2546 struct ieee80211com *ic = ni->ni_ic; 2547 struct ifnet *ifp = vap->iv_ifp; 2548 struct ieee80211_frame *wh; 2549 struct mbuf *m; 2550 int pktlen; 2551 uint8_t *frm; 2552 2553 /* 2554 * beacon frame format 2555 * [8] time stamp 2556 * [2] beacon interval 2557 * [2] cabability information 2558 * [tlv] ssid 2559 * [tlv] supported rates 2560 * [3] parameter set (DS) 2561 * [8] CF parameter set (optional) 2562 * [tlv] parameter set (IBSS/TIM) 2563 * [tlv] country (optional) 2564 * [3] power control (optional) 2565 * [5] channel switch announcement (CSA) (optional) 2566 * [tlv] extended rate phy (ERP) 2567 * [tlv] extended supported rates 2568 * [tlv] RSN parameters 2569 * [tlv] HT capabilities 2570 * [tlv] HT information 2571 * [tlv] Vendor OUI HT capabilities (optional) 2572 * [tlv] Vendor OUI HT information (optional) 2573 * XXX Vendor-specific OIDs (e.g. Atheros) 2574 * [tlv] WPA parameters 2575 * [tlv] WME parameters 2576 * [tlv] application data (optional) 2577 * NB: we allocate the max space required for the TIM bitmap. 2578 * XXX how big is this? 2579 */ 2580 pktlen = 8 /* time stamp */ 2581 + sizeof(uint16_t) /* beacon interval */ 2582 + sizeof(uint16_t) /* capabilities */ 2583 + 2 + ni->ni_esslen /* ssid */ 2584 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2585 + 2 + 1 /* DS parameters */ 2586 + 2 + 6 /* CF parameters */ 2587 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2588 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2589 + 2 + 1 /* power control */ 2590 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2591 + 2 + 1 /* ERP */ 2592 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2593 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2594 2*sizeof(struct ieee80211_ie_wpa) : 0) 2595 /* XXX conditional? */ 2596 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2597 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2598 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2599 sizeof(struct ieee80211_wme_param) : 0) 2600 + IEEE80211_MAX_APPIE 2601 ; 2602 m = ieee80211_getmgtframe(&frm, 2603 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2604 if (m == NULL) { 2605 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2606 "%s: cannot get buf; size %u\n", __func__, pktlen); 2607 vap->iv_stats.is_tx_nobuf++; 2608 return NULL; 2609 } 2610 ieee80211_beacon_construct(m, frm, bo, ni); 2611 2612 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2613 KASSERT(m != NULL, ("no space for 802.11 header?")); 2614 wh = mtod(m, struct ieee80211_frame *); 2615 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2616 IEEE80211_FC0_SUBTYPE_BEACON; 2617 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2618 *(uint16_t *)wh->i_dur = 0; 2619 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2620 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2621 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2622 *(uint16_t *)wh->i_seq = 0; 2623 2624 return m; 2625} 2626 2627/* 2628 * Update the dynamic parts of a beacon frame based on the current state. 2629 */ 2630int 2631ieee80211_beacon_update(struct ieee80211_node *ni, 2632 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2633{ 2634 struct ieee80211vap *vap = ni->ni_vap; 2635 struct ieee80211com *ic = ni->ni_ic; 2636 int len_changed = 0; 2637 uint16_t capinfo; 2638 2639 IEEE80211_LOCK(ic); 2640 /* 2641 * Handle 11h channel change when we've reached the count. 2642 * We must recalculate the beacon frame contents to account 2643 * for the new channel. Note we do this only for the first 2644 * vap that reaches this point; subsequent vaps just update 2645 * their beacon state to reflect the recalculated channel. 2646 */ 2647 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2648 vap->iv_csa_count == ic->ic_csa_count) { 2649 vap->iv_csa_count = 0; 2650 /* 2651 * Effect channel change before reconstructing the beacon 2652 * frame contents as many places reference ni_chan. 2653 */ 2654 if (ic->ic_csa_newchan != NULL) 2655 ieee80211_csa_completeswitch(ic); 2656 /* 2657 * NB: ieee80211_beacon_construct clears all pending 2658 * updates in bo_flags so we don't need to explicitly 2659 * clear IEEE80211_BEACON_CSA. 2660 */ 2661 ieee80211_beacon_construct(m, 2662 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2663 2664 /* XXX do WME aggressive mode processing? */ 2665 IEEE80211_UNLOCK(ic); 2666 return 1; /* just assume length changed */ 2667 } 2668 2669 /* XXX faster to recalculate entirely or just changes? */ 2670 capinfo = getcapinfo(vap, ni->ni_chan); 2671 *bo->bo_caps = htole16(capinfo); 2672 2673 if (vap->iv_flags & IEEE80211_F_WME) { 2674 struct ieee80211_wme_state *wme = &ic->ic_wme; 2675 2676 /* 2677 * Check for agressive mode change. When there is 2678 * significant high priority traffic in the BSS 2679 * throttle back BE traffic by using conservative 2680 * parameters. Otherwise BE uses agressive params 2681 * to optimize performance of legacy/non-QoS traffic. 2682 */ 2683 if (wme->wme_flags & WME_F_AGGRMODE) { 2684 if (wme->wme_hipri_traffic > 2685 wme->wme_hipri_switch_thresh) { 2686 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2687 "%s: traffic %u, disable aggressive mode\n", 2688 __func__, wme->wme_hipri_traffic); 2689 wme->wme_flags &= ~WME_F_AGGRMODE; 2690 ieee80211_wme_updateparams_locked(vap); 2691 wme->wme_hipri_traffic = 2692 wme->wme_hipri_switch_hysteresis; 2693 } else 2694 wme->wme_hipri_traffic = 0; 2695 } else { 2696 if (wme->wme_hipri_traffic <= 2697 wme->wme_hipri_switch_thresh) { 2698 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2699 "%s: traffic %u, enable aggressive mode\n", 2700 __func__, wme->wme_hipri_traffic); 2701 wme->wme_flags |= WME_F_AGGRMODE; 2702 ieee80211_wme_updateparams_locked(vap); 2703 wme->wme_hipri_traffic = 0; 2704 } else 2705 wme->wme_hipri_traffic = 2706 wme->wme_hipri_switch_hysteresis; 2707 } 2708 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2709 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2710 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2711 } 2712 } 2713 2714 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2715 ieee80211_ht_update_beacon(vap, bo); 2716 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2717 } 2718 2719 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2720 struct ieee80211_tim_ie *tie = 2721 (struct ieee80211_tim_ie *) bo->bo_tim; 2722 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2723 u_int timlen, timoff, i; 2724 /* 2725 * ATIM/DTIM needs updating. If it fits in the 2726 * current space allocated then just copy in the 2727 * new bits. Otherwise we need to move any trailing 2728 * data to make room. Note that we know there is 2729 * contiguous space because ieee80211_beacon_allocate 2730 * insures there is space in the mbuf to write a 2731 * maximal-size virtual bitmap (based on iv_max_aid). 2732 */ 2733 /* 2734 * Calculate the bitmap size and offset, copy any 2735 * trailer out of the way, and then copy in the 2736 * new bitmap and update the information element. 2737 * Note that the tim bitmap must contain at least 2738 * one byte and any offset must be even. 2739 */ 2740 if (vap->iv_ps_pending != 0) { 2741 timoff = 128; /* impossibly large */ 2742 for (i = 0; i < vap->iv_tim_len; i++) 2743 if (vap->iv_tim_bitmap[i]) { 2744 timoff = i &~ 1; 2745 break; 2746 } 2747 KASSERT(timoff != 128, ("tim bitmap empty!")); 2748 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2749 if (vap->iv_tim_bitmap[i]) 2750 break; 2751 timlen = 1 + (i - timoff); 2752 } else { 2753 timoff = 0; 2754 timlen = 1; 2755 } 2756 if (timlen != bo->bo_tim_len) { 2757 /* copy up/down trailer */ 2758 int adjust = tie->tim_bitmap+timlen 2759 - bo->bo_tim_trailer; 2760 ovbcopy(bo->bo_tim_trailer, 2761 bo->bo_tim_trailer+adjust, 2762 bo->bo_tim_trailer_len); 2763 bo->bo_tim_trailer += adjust; 2764 bo->bo_erp += adjust; 2765 bo->bo_htinfo += adjust; 2766 bo->bo_appie += adjust; 2767 bo->bo_wme += adjust; 2768 bo->bo_csa += adjust; 2769 bo->bo_tim_len = timlen; 2770 2771 /* update information element */ 2772 tie->tim_len = 3 + timlen; 2773 tie->tim_bitctl = timoff; 2774 len_changed = 1; 2775 } 2776 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2777 bo->bo_tim_len); 2778 2779 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2780 2781 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2782 "%s: TIM updated, pending %u, off %u, len %u\n", 2783 __func__, vap->iv_ps_pending, timoff, timlen); 2784 } 2785 /* count down DTIM period */ 2786 if (tie->tim_count == 0) 2787 tie->tim_count = tie->tim_period - 1; 2788 else 2789 tie->tim_count--; 2790 /* update state for buffered multicast frames on DTIM */ 2791 if (mcast && tie->tim_count == 0) 2792 tie->tim_bitctl |= 1; 2793 else 2794 tie->tim_bitctl &= ~1; 2795 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2796 struct ieee80211_csa_ie *csa = 2797 (struct ieee80211_csa_ie *) bo->bo_csa; 2798 2799 /* 2800 * Insert or update CSA ie. If we're just starting 2801 * to count down to the channel switch then we need 2802 * to insert the CSA ie. Otherwise we just need to 2803 * drop the count. The actual change happens above 2804 * when the vap's count reaches the target count. 2805 */ 2806 if (vap->iv_csa_count == 0) { 2807 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2808 bo->bo_erp += sizeof(*csa); 2809 bo->bo_wme += sizeof(*csa); 2810 bo->bo_appie += sizeof(*csa); 2811 bo->bo_csa_trailer_len += sizeof(*csa); 2812 bo->bo_tim_trailer_len += sizeof(*csa); 2813 m->m_len += sizeof(*csa); 2814 m->m_pkthdr.len += sizeof(*csa); 2815 2816 ieee80211_add_csa(bo->bo_csa, vap); 2817 } else 2818 csa->csa_count--; 2819 vap->iv_csa_count++; 2820 /* NB: don't clear IEEE80211_BEACON_CSA */ 2821 } 2822 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2823 /* 2824 * ERP element needs updating. 2825 */ 2826 (void) ieee80211_add_erp(bo->bo_erp, ic); 2827 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2828 } 2829 } 2830 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2831 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2832 int aielen; 2833 uint8_t *frm; 2834 2835 aielen = 0; 2836 if (aie != NULL) 2837 aielen += aie->ie_len; 2838 if (aielen != bo->bo_appie_len) { 2839 /* copy up/down trailer */ 2840 int adjust = aielen - bo->bo_appie_len; 2841 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2842 bo->bo_tim_trailer_len); 2843 bo->bo_tim_trailer += adjust; 2844 bo->bo_appie += adjust; 2845 bo->bo_appie_len = aielen; 2846 2847 len_changed = 1; 2848 } 2849 frm = bo->bo_appie; 2850 if (aie != NULL) 2851 frm = add_appie(frm, aie); 2852 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2853 } 2854 IEEE80211_UNLOCK(ic); 2855 2856 return len_changed; 2857} 2858