ieee80211_output.c revision 184285
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 184285 2008-10-26 00:52:26Z 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 * frame. Note this should be called early on in constructing 405 * a frame as it sets i_fc[1]; other bits can then be or'd in. 406 */ 407static void 408ieee80211_send_setup( 409 struct ieee80211_node *ni, 410 struct ieee80211_frame *wh, 411 int type, int tid, 412 const uint8_t sa[IEEE80211_ADDR_LEN], 413 const uint8_t da[IEEE80211_ADDR_LEN], 414 const uint8_t bssid[IEEE80211_ADDR_LEN]) 415{ 416#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 417 418 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 419 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 420 struct ieee80211vap *vap = ni->ni_vap; 421 422 switch (vap->iv_opmode) { 423 case IEEE80211_M_STA: 424 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 425 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 426 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 427 IEEE80211_ADDR_COPY(wh->i_addr3, da); 428 break; 429 case IEEE80211_M_IBSS: 430 case IEEE80211_M_AHDEMO: 431 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 432 IEEE80211_ADDR_COPY(wh->i_addr1, da); 433 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 434 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 435 break; 436 case IEEE80211_M_HOSTAP: 437 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 438 IEEE80211_ADDR_COPY(wh->i_addr1, da); 439 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 440 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 441 break; 442 case IEEE80211_M_WDS: 443 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 444 IEEE80211_ADDR_COPY(wh->i_addr1, da); 445 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 446 IEEE80211_ADDR_COPY(wh->i_addr3, da); 447 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 448 break; 449 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 450 break; 451 } 452 } else { 453 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 454 IEEE80211_ADDR_COPY(wh->i_addr1, da); 455 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 456 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 457 } 458 *(uint16_t *)&wh->i_dur[0] = 0; 459 *(uint16_t *)&wh->i_seq[0] = 460 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 461 ni->ni_txseqs[tid]++; 462#undef WH4 463} 464 465/* 466 * Send a management frame to the specified node. The node pointer 467 * must have a reference as the pointer will be passed to the driver 468 * and potentially held for a long time. If the frame is successfully 469 * dispatched to the driver, then it is responsible for freeing the 470 * reference (and potentially free'ing up any associated storage); 471 * otherwise deal with reclaiming any reference (on error). 472 */ 473int 474ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 475 struct ieee80211_bpf_params *params) 476{ 477 struct ieee80211vap *vap = ni->ni_vap; 478 struct ieee80211com *ic = ni->ni_ic; 479 struct ieee80211_frame *wh; 480 481 KASSERT(ni != NULL, ("null node")); 482 483 if (vap->iv_state == IEEE80211_S_CAC) { 484 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 485 ni, "block %s frame in CAC state", 486 ieee80211_mgt_subtype_name[ 487 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 488 IEEE80211_FC0_SUBTYPE_SHIFT]); 489 vap->iv_stats.is_tx_badstate++; 490 ieee80211_free_node(ni); 491 m_freem(m); 492 return EIO; /* XXX */ 493 } 494 495 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 496 if (m == NULL) { 497 ieee80211_free_node(ni); 498 return ENOMEM; 499 } 500 501 wh = mtod(m, struct ieee80211_frame *); 502 ieee80211_send_setup(ni, wh, 503 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 504 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 505 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 506 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 507 "encrypting frame (%s)", __func__); 508 wh->i_fc[1] |= IEEE80211_FC1_WEP; 509 } 510 511 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 512 M_WME_SETAC(m, params->ibp_pri); 513 514#ifdef IEEE80211_DEBUG 515 /* avoid printing too many frames */ 516 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 517 ieee80211_msg_dumppkts(vap)) { 518 printf("[%s] send %s on channel %u\n", 519 ether_sprintf(wh->i_addr1), 520 ieee80211_mgt_subtype_name[ 521 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 522 IEEE80211_FC0_SUBTYPE_SHIFT], 523 ieee80211_chan2ieee(ic, ic->ic_curchan)); 524 } 525#endif 526 IEEE80211_NODE_STAT(ni, tx_mgmt); 527 528 return ic->ic_raw_xmit(ni, m, params); 529} 530 531/* 532 * Send a null data frame to the specified node. If the station 533 * is setup for QoS then a QoS Null Data frame is constructed. 534 * If this is a WDS station then a 4-address frame is constructed. 535 * 536 * NB: the caller is assumed to have setup a node reference 537 * for use; this is necessary to deal with a race condition 538 * when probing for inactive stations. Like ieee80211_mgmt_output 539 * we must cleanup any node reference on error; however we 540 * can safely just unref it as we know it will never be the 541 * last reference to the node. 542 */ 543int 544ieee80211_send_nulldata(struct ieee80211_node *ni) 545{ 546 struct ieee80211vap *vap = ni->ni_vap; 547 struct ieee80211com *ic = ni->ni_ic; 548 struct mbuf *m; 549 struct ieee80211_frame *wh; 550 int hdrlen; 551 uint8_t *frm; 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 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 562 hdrlen = sizeof(struct ieee80211_qosframe); 563 else 564 hdrlen = sizeof(struct ieee80211_frame); 565 /* NB: only WDS vap's get 4-address frames */ 566 if (vap->iv_opmode == IEEE80211_M_WDS) 567 hdrlen += IEEE80211_ADDR_LEN; 568 if (ic->ic_flags & IEEE80211_F_DATAPAD) 569 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 570 571 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 572 if (m == NULL) { 573 /* XXX debug msg */ 574 ieee80211_unref_node(&ni); 575 vap->iv_stats.is_tx_nobuf++; 576 return ENOMEM; 577 } 578 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 579 ("leading space %zd", M_LEADINGSPACE(m))); 580 M_PREPEND(m, hdrlen, M_DONTWAIT); 581 if (m == NULL) { 582 /* NB: cannot happen */ 583 ieee80211_free_node(ni); 584 return ENOMEM; 585 } 586 587 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 588 if (ni->ni_flags & IEEE80211_NODE_QOS) { 589 const int tid = WME_AC_TO_TID(WME_AC_BE); 590 uint8_t *qos; 591 592 ieee80211_send_setup(ni, wh, 593 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 594 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 595 596 if (vap->iv_opmode == IEEE80211_M_WDS) 597 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 598 else 599 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 600 qos[0] = tid & IEEE80211_QOS_TID; 601 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 602 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 603 qos[1] = 0; 604 } else { 605 ieee80211_send_setup(ni, wh, 606 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 607 IEEE80211_NONQOS_TID, 608 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 609 } 610 if (vap->iv_opmode != IEEE80211_M_WDS) { 611 /* NB: power management bit is never sent by an AP */ 612 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 613 vap->iv_opmode != IEEE80211_M_HOSTAP) 614 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 615 } 616 m->m_len = m->m_pkthdr.len = hdrlen; 617 618 M_WME_SETAC(m, WME_AC_BE); 619 620 IEEE80211_NODE_STAT(ni, tx_data); 621 622 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 623 "send %snull data frame on channel %u, pwr mgt %s", 624 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 625 ieee80211_chan2ieee(ic, ic->ic_curchan), 626 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 627 628 return ic->ic_raw_xmit(ni, m, NULL); 629} 630 631/* 632 * Assign priority to a frame based on any vlan tag assigned 633 * to the station and/or any Diffserv setting in an IP header. 634 * Finally, if an ACM policy is setup (in station mode) it's 635 * applied. 636 */ 637int 638ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 639{ 640 const struct ether_header *eh = mtod(m, struct ether_header *); 641 int v_wme_ac, d_wme_ac, ac; 642 643 /* 644 * Always promote PAE/EAPOL frames to high priority. 645 */ 646 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 647 /* NB: mark so others don't need to check header */ 648 m->m_flags |= M_EAPOL; 649 ac = WME_AC_VO; 650 goto done; 651 } 652 /* 653 * Non-qos traffic goes to BE. 654 */ 655 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 656 ac = WME_AC_BE; 657 goto done; 658 } 659 660 /* 661 * If node has a vlan tag then all traffic 662 * to it must have a matching tag. 663 */ 664 v_wme_ac = 0; 665 if (ni->ni_vlan != 0) { 666 if ((m->m_flags & M_VLANTAG) == 0) { 667 IEEE80211_NODE_STAT(ni, tx_novlantag); 668 return 1; 669 } 670 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 671 EVL_VLANOFTAG(ni->ni_vlan)) { 672 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 673 return 1; 674 } 675 /* map vlan priority to AC */ 676 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 677 } 678 679#ifdef INET 680 if (eh->ether_type == htons(ETHERTYPE_IP)) { 681 uint8_t tos; 682 /* 683 * IP frame, map the DSCP bits from the TOS field. 684 */ 685 /* XXX m_copydata may be too slow for fast path */ 686 /* NB: ip header may not be in first mbuf */ 687 m_copydata(m, sizeof(struct ether_header) + 688 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 689 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 690 d_wme_ac = TID_TO_WME_AC(tos); 691 } else { 692#endif /* INET */ 693 d_wme_ac = WME_AC_BE; 694#ifdef INET 695 } 696#endif 697 /* 698 * Use highest priority AC. 699 */ 700 if (v_wme_ac > d_wme_ac) 701 ac = v_wme_ac; 702 else 703 ac = d_wme_ac; 704 705 /* 706 * Apply ACM policy. 707 */ 708 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 709 static const int acmap[4] = { 710 WME_AC_BK, /* WME_AC_BE */ 711 WME_AC_BK, /* WME_AC_BK */ 712 WME_AC_BE, /* WME_AC_VI */ 713 WME_AC_VI, /* WME_AC_VO */ 714 }; 715 struct ieee80211com *ic = ni->ni_ic; 716 717 while (ac != WME_AC_BK && 718 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 719 ac = acmap[ac]; 720 } 721done: 722 M_WME_SETAC(m, ac); 723 return 0; 724} 725 726/* 727 * Insure there is sufficient contiguous space to encapsulate the 728 * 802.11 data frame. If room isn't already there, arrange for it. 729 * Drivers and cipher modules assume we have done the necessary work 730 * and fail rudely if they don't find the space they need. 731 */ 732static struct mbuf * 733ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 734 struct ieee80211_key *key, struct mbuf *m) 735{ 736#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 737 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 738 739 if (key != NULL) { 740 /* XXX belongs in crypto code? */ 741 needed_space += key->wk_cipher->ic_header; 742 /* XXX frags */ 743 /* 744 * When crypto is being done in the host we must insure 745 * the data are writable for the cipher routines; clone 746 * a writable mbuf chain. 747 * XXX handle SWMIC specially 748 */ 749 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 750 m = m_unshare(m, M_NOWAIT); 751 if (m == NULL) { 752 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 753 "%s: cannot get writable mbuf\n", __func__); 754 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 755 return NULL; 756 } 757 } 758 } 759 /* 760 * We know we are called just before stripping an Ethernet 761 * header and prepending an LLC header. This means we know 762 * there will be 763 * sizeof(struct ether_header) - sizeof(struct llc) 764 * bytes recovered to which we need additional space for the 765 * 802.11 header and any crypto header. 766 */ 767 /* XXX check trailing space and copy instead? */ 768 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 769 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 770 if (n == NULL) { 771 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 772 "%s: cannot expand storage\n", __func__); 773 vap->iv_stats.is_tx_nobuf++; 774 m_freem(m); 775 return NULL; 776 } 777 KASSERT(needed_space <= MHLEN, 778 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 779 /* 780 * Setup new mbuf to have leading space to prepend the 781 * 802.11 header and any crypto header bits that are 782 * required (the latter are added when the driver calls 783 * back to ieee80211_crypto_encap to do crypto encapsulation). 784 */ 785 /* NB: must be first 'cuz it clobbers m_data */ 786 m_move_pkthdr(n, m); 787 n->m_len = 0; /* NB: m_gethdr does not set */ 788 n->m_data += needed_space; 789 /* 790 * Pull up Ethernet header to create the expected layout. 791 * We could use m_pullup but that's overkill (i.e. we don't 792 * need the actual data) and it cannot fail so do it inline 793 * for speed. 794 */ 795 /* NB: struct ether_header is known to be contiguous */ 796 n->m_len += sizeof(struct ether_header); 797 m->m_len -= sizeof(struct ether_header); 798 m->m_data += sizeof(struct ether_header); 799 /* 800 * Replace the head of the chain. 801 */ 802 n->m_next = m; 803 m = n; 804 } 805 return m; 806#undef TO_BE_RECLAIMED 807} 808 809/* 810 * Return the transmit key to use in sending a unicast frame. 811 * If a unicast key is set we use that. When no unicast key is set 812 * we fall back to the default transmit key. 813 */ 814static __inline struct ieee80211_key * 815ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 816 struct ieee80211_node *ni) 817{ 818 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 819 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 820 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 821 return NULL; 822 return &vap->iv_nw_keys[vap->iv_def_txkey]; 823 } else { 824 return &ni->ni_ucastkey; 825 } 826} 827 828/* 829 * Return the transmit key to use in sending a multicast frame. 830 * Multicast traffic always uses the group key which is installed as 831 * the default tx key. 832 */ 833static __inline struct ieee80211_key * 834ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 835 struct ieee80211_node *ni) 836{ 837 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 838 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 839 return NULL; 840 return &vap->iv_nw_keys[vap->iv_def_txkey]; 841} 842 843/* 844 * Encapsulate an outbound data frame. The mbuf chain is updated. 845 * If an error is encountered NULL is returned. The caller is required 846 * to provide a node reference and pullup the ethernet header in the 847 * first mbuf. 848 * 849 * NB: Packet is assumed to be processed by ieee80211_classify which 850 * marked EAPOL frames w/ M_EAPOL. 851 */ 852struct mbuf * 853ieee80211_encap(struct ieee80211_node *ni, struct mbuf *m) 854{ 855#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 856 struct ieee80211vap *vap = ni->ni_vap; 857 struct ieee80211com *ic = ni->ni_ic; 858 struct ether_header eh; 859 struct ieee80211_frame *wh; 860 struct ieee80211_key *key; 861 struct llc *llc; 862 int hdrsize, hdrspace, datalen, addqos, txfrag, isff, is4addr; 863 864 /* 865 * Copy existing Ethernet header to a safe place. The 866 * rest of the code assumes it's ok to strip it when 867 * reorganizing state for the final encapsulation. 868 */ 869 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 870 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 871 872 /* 873 * Insure space for additional headers. First identify 874 * transmit key to use in calculating any buffer adjustments 875 * required. This is also used below to do privacy 876 * encapsulation work. Then calculate the 802.11 header 877 * size and any padding required by the driver. 878 * 879 * Note key may be NULL if we fall back to the default 880 * transmit key and that is not set. In that case the 881 * buffer may not be expanded as needed by the cipher 882 * routines, but they will/should discard it. 883 */ 884 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 885 if (vap->iv_opmode == IEEE80211_M_STA || 886 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 887 (vap->iv_opmode == IEEE80211_M_WDS && 888 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 889 key = ieee80211_crypto_getucastkey(vap, ni); 890 else 891 key = ieee80211_crypto_getmcastkey(vap, ni); 892 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 893 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 894 eh.ether_dhost, 895 "no default transmit key (%s) deftxkey %u", 896 __func__, vap->iv_def_txkey); 897 vap->iv_stats.is_tx_nodefkey++; 898 goto bad; 899 } 900 } else 901 key = NULL; 902 /* 903 * XXX Some ap's don't handle QoS-encapsulated EAPOL 904 * frames so suppress use. This may be an issue if other 905 * ap's require all data frames to be QoS-encapsulated 906 * once negotiated in which case we'll need to make this 907 * configurable. 908 */ 909 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 910 (m->m_flags & M_EAPOL) == 0; 911 if (addqos) 912 hdrsize = sizeof(struct ieee80211_qosframe); 913 else 914 hdrsize = sizeof(struct ieee80211_frame); 915 /* 916 * 4-address frames need to be generated for: 917 * o packets sent through a WDS vap (M_WDS || IEEE80211_M_WDS) 918 * o packets relayed by a station operating with dynamic WDS 919 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 920 */ 921 is4addr = (m->m_flags & M_WDS) || 922 vap->iv_opmode == IEEE80211_M_WDS || /* XXX redundant? */ 923 (vap->iv_opmode == IEEE80211_M_STA && 924 (vap->iv_flags & IEEE80211_F_DWDS) && 925 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 926 if (is4addr) 927 hdrsize += IEEE80211_ADDR_LEN; 928 /* 929 * Honor driver DATAPAD requirement. 930 */ 931 if (ic->ic_flags & IEEE80211_F_DATAPAD) 932 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 933 else 934 hdrspace = hdrsize; 935 936 if ((isff = m->m_flags & M_FF) != 0) { 937 struct mbuf *m2; 938 struct ether_header eh2; 939 940 /* 941 * Fast frame encapsulation. There must be two packets 942 * chained with m_nextpkt. We do header adjustment for 943 * each, add the tunnel encapsulation, and then concatenate 944 * the mbuf chains to form a single frame for transmission. 945 */ 946 m2 = m->m_nextpkt; 947 if (m2 == NULL) { 948 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 949 "%s: only one frame\n", __func__); 950 goto bad; 951 } 952 m->m_nextpkt = NULL; 953 /* 954 * Include fast frame headers in adjusting header 955 * layout; this allocates space according to what 956 * ieee80211_encap_fastframe will do. 957 */ 958 m = ieee80211_mbuf_adjust(vap, 959 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 960 sizeof(struct ether_header), 961 key, m); 962 if (m == NULL) { 963 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 964 m_freem(m2); 965 goto bad; 966 } 967 /* 968 * Copy second frame's Ethernet header out of line 969 * and adjust for encapsulation headers. Note that 970 * we make room for padding in case there isn't room 971 * at the end of first frame. 972 */ 973 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 974 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 975 m2 = ieee80211_mbuf_adjust(vap, 976 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 977 NULL, m2); 978 if (m2 == NULL) { 979 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 980 goto bad; 981 } 982 m = ieee80211_encap_fastframe(vap, m, &eh, m2, &eh2); 983 if (m == NULL) 984 goto bad; 985 } else { 986 /* 987 * Normal frame. 988 */ 989 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 990 if (m == NULL) { 991 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 992 goto bad; 993 } 994 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 995 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 996 llc = mtod(m, struct llc *); 997 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 998 llc->llc_control = LLC_UI; 999 llc->llc_snap.org_code[0] = 0; 1000 llc->llc_snap.org_code[1] = 0; 1001 llc->llc_snap.org_code[2] = 0; 1002 llc->llc_snap.ether_type = eh.ether_type; 1003 } 1004 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1005 1006 M_PREPEND(m, hdrspace, M_DONTWAIT); 1007 if (m == NULL) { 1008 vap->iv_stats.is_tx_nobuf++; 1009 goto bad; 1010 } 1011 wh = mtod(m, struct ieee80211_frame *); 1012 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1013 *(uint16_t *)wh->i_dur = 0; 1014 if (is4addr) { 1015 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1016 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1017 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1018 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1019 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1020 } else switch (vap->iv_opmode) { 1021 case IEEE80211_M_STA: 1022 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1023 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1024 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1025 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1026 break; 1027 case IEEE80211_M_IBSS: 1028 case IEEE80211_M_AHDEMO: 1029 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1030 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1031 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1032 /* 1033 * NB: always use the bssid from iv_bss as the 1034 * neighbor's may be stale after an ibss merge 1035 */ 1036 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1037 break; 1038 case IEEE80211_M_HOSTAP: 1039 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1040 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1041 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1042 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1043 break; 1044 case IEEE80211_M_MONITOR: 1045 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1046 goto bad; 1047 } 1048 if (m->m_flags & M_MORE_DATA) 1049 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1050 if (addqos) { 1051 uint8_t *qos; 1052 int ac, tid; 1053 1054 if (is4addr) { 1055 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1056 } else 1057 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1058 ac = M_WME_GETAC(m); 1059 /* map from access class/queue to 11e header priorty value */ 1060 tid = WME_AC_TO_TID(ac); 1061 qos[0] = tid & IEEE80211_QOS_TID; 1062 /* 1063 * Check if A-MPDU tx aggregation is setup or if we 1064 * should try to enable it. The sta must be associated 1065 * with HT and A-MPDU enabled for use. When the policy 1066 * routine decides we should enable A-MPDU we issue an 1067 * ADDBA request and wait for a reply. The frame being 1068 * encapsulated will go out w/o using A-MPDU, or possibly 1069 * it might be collected by the driver and held/retransmit. 1070 * The default ic_ampdu_enable routine handles staggering 1071 * ADDBA requests in case the receiver NAK's us or we are 1072 * otherwise unable to establish a BA stream. 1073 */ 1074 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1075 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1076 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1077 1078 ieee80211_txampdu_count_packet(tap); 1079 if (IEEE80211_AMPDU_RUNNING(tap)) { 1080 /* 1081 * Operational, mark frame for aggregation. 1082 * 1083 * NB: We support only immediate BA's for 1084 * AMPDU which means we set the QoS control 1085 * field to "normal ack" (0) to get "implicit 1086 * block ack" behaviour. 1087 */ 1088 m->m_flags |= M_AMPDU_MPDU; 1089 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1090 ic->ic_ampdu_enable(ni, tap)) { 1091 /* 1092 * Not negotiated yet, request service. 1093 */ 1094 ieee80211_ampdu_request(ni, tap); 1095 } 1096 } 1097 /* XXX works even when BA marked above */ 1098 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1099 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1100 qos[1] = 0; 1101 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1102 1103 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1104 /* 1105 * NB: don't assign a sequence # to potential 1106 * aggregates; we expect this happens at the 1107 * point the frame comes off any aggregation q 1108 * as otherwise we may introduce holes in the 1109 * BA sequence space and/or make window accouting 1110 * more difficult. 1111 * 1112 * XXX may want to control this with a driver 1113 * capability; this may also change when we pull 1114 * aggregation up into net80211 1115 */ 1116 *(uint16_t *)wh->i_seq = 1117 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1118 ni->ni_txseqs[tid]++; 1119 } 1120 } else { 1121 *(uint16_t *)wh->i_seq = 1122 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1123 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1124 } 1125 /* check if xmit fragmentation is required */ 1126 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1127 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1128 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1129 !isff); /* NB: don't fragment ff's */ 1130 if (key != NULL) { 1131 /* 1132 * IEEE 802.1X: send EAPOL frames always in the clear. 1133 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1134 */ 1135 if ((m->m_flags & M_EAPOL) == 0 || 1136 ((vap->iv_flags & IEEE80211_F_WPA) && 1137 (vap->iv_opmode == IEEE80211_M_STA ? 1138 !IEEE80211_KEY_UNDEFINED(key) : 1139 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1140 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1141 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1142 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1143 eh.ether_dhost, 1144 "%s", "enmic failed, discard frame"); 1145 vap->iv_stats.is_crypto_enmicfail++; 1146 goto bad; 1147 } 1148 } 1149 } 1150 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1151 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1152 goto bad; 1153 1154 IEEE80211_NODE_STAT(ni, tx_data); 1155 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1156 IEEE80211_NODE_STAT(ni, tx_mcast); 1157 else 1158 IEEE80211_NODE_STAT(ni, tx_ucast); 1159 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1160 1161 /* XXX fragmented frames not handled */ 1162 if (bpf_peers_present(vap->iv_rawbpf)) 1163 bpf_mtap(vap->iv_rawbpf, m); 1164 1165 return m; 1166bad: 1167 if (m != NULL) 1168 m_freem(m); 1169 return NULL; 1170#undef WH4 1171} 1172 1173/* 1174 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1175 * tunnel encapsulation. The frame is assumed to have an Ethernet 1176 * header at the front that must be stripped before prepending the 1177 * LLC followed by the Ethernet header passed in (with an Ethernet 1178 * type that specifies the payload size). 1179 */ 1180static struct mbuf * 1181ieee80211_encap1(struct ieee80211vap *vap, struct mbuf *m, 1182 const struct ether_header *eh) 1183{ 1184 struct llc *llc; 1185 uint16_t payload; 1186 1187 /* XXX optimize by combining m_adj+M_PREPEND */ 1188 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1189 llc = mtod(m, struct llc *); 1190 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1191 llc->llc_control = LLC_UI; 1192 llc->llc_snap.org_code[0] = 0; 1193 llc->llc_snap.org_code[1] = 0; 1194 llc->llc_snap.org_code[2] = 0; 1195 llc->llc_snap.ether_type = eh->ether_type; 1196 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1197 1198 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1199 if (m == NULL) { /* XXX cannot happen */ 1200 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1201 "%s: no space for ether_header\n", __func__); 1202 vap->iv_stats.is_tx_nobuf++; 1203 return NULL; 1204 } 1205 ETHER_HEADER_COPY(mtod(m, void *), eh); 1206 mtod(m, struct ether_header *)->ether_type = htons(payload); 1207 return m; 1208} 1209 1210/* 1211 * Do fast frame tunnel encapsulation. The two frames and 1212 * Ethernet headers are supplied. The caller is assumed to 1213 * have arrange for space in the mbuf chains for encapsulating 1214 * headers (to avoid major mbuf fragmentation). 1215 * 1216 * The encapsulated frame is returned or NULL if there is a 1217 * problem (should not happen). 1218 */ 1219static struct mbuf * 1220ieee80211_encap_fastframe(struct ieee80211vap *vap, 1221 struct mbuf *m1, const struct ether_header *eh1, 1222 struct mbuf *m2, const struct ether_header *eh2) 1223{ 1224 struct llc *llc; 1225 struct mbuf *m; 1226 int pad; 1227 1228 /* 1229 * First, each frame gets a standard encapsulation. 1230 */ 1231 m1 = ieee80211_encap1(vap, m1, eh1); 1232 if (m1 == NULL) { 1233 m_freem(m2); 1234 return NULL; 1235 } 1236 m2 = ieee80211_encap1(vap, m2, eh2); 1237 if (m2 == NULL) { 1238 m_freem(m1); 1239 return NULL; 1240 } 1241 1242 /* 1243 * Pad leading frame to a 4-byte boundary. If there 1244 * is space at the end of the first frame, put it 1245 * there; otherwise prepend to the front of the second 1246 * frame. We know doing the second will always work 1247 * because we reserve space above. We prefer appending 1248 * as this typically has better DMA alignment properties. 1249 */ 1250 for (m = m1; m->m_next != NULL; m = m->m_next) 1251 ; 1252 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1253 if (pad) { 1254 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1255 m2->m_data -= pad; 1256 m2->m_len += pad; 1257 m2->m_pkthdr.len += pad; 1258 } else { /* append to first */ 1259 m->m_len += pad; 1260 m1->m_pkthdr.len += pad; 1261 } 1262 } 1263 1264 /* 1265 * Now, stick 'em together and prepend the tunnel headers; 1266 * first the Atheros tunnel header (all zero for now) and 1267 * then a special fast frame LLC. 1268 * 1269 * XXX optimize by prepending together 1270 */ 1271 m->m_next = m2; /* NB: last mbuf from above */ 1272 m1->m_pkthdr.len += m2->m_pkthdr.len; 1273 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1274 if (m1 == NULL) { /* XXX cannot happen */ 1275 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1276 "%s: no space for tunnel header\n", __func__); 1277 vap->iv_stats.is_tx_nobuf++; 1278 return NULL; 1279 } 1280 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1281 1282 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1283 if (m1 == NULL) { /* XXX cannot happen */ 1284 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1285 "%s: no space for llc header\n", __func__); 1286 vap->iv_stats.is_tx_nobuf++; 1287 return NULL; 1288 } 1289 llc = mtod(m1, struct llc *); 1290 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1291 llc->llc_control = LLC_UI; 1292 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1293 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1294 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1295 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1296 1297 vap->iv_stats.is_ff_encap++; 1298 1299 return m1; 1300} 1301 1302/* 1303 * Fragment the frame according to the specified mtu. 1304 * The size of the 802.11 header (w/o padding) is provided 1305 * so we don't need to recalculate it. We create a new 1306 * mbuf for each fragment and chain it through m_nextpkt; 1307 * we might be able to optimize this by reusing the original 1308 * packet's mbufs but that is significantly more complicated. 1309 */ 1310static int 1311ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1312 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1313{ 1314 struct ieee80211_frame *wh, *whf; 1315 struct mbuf *m, *prev, *next; 1316 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1317 1318 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1319 KASSERT(m0->m_pkthdr.len > mtu, 1320 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1321 1322 wh = mtod(m0, struct ieee80211_frame *); 1323 /* NB: mark the first frag; it will be propagated below */ 1324 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1325 totalhdrsize = hdrsize + ciphdrsize; 1326 fragno = 1; 1327 off = mtu - ciphdrsize; 1328 remainder = m0->m_pkthdr.len - off; 1329 prev = m0; 1330 do { 1331 fragsize = totalhdrsize + remainder; 1332 if (fragsize > mtu) 1333 fragsize = mtu; 1334 /* XXX fragsize can be >2048! */ 1335 KASSERT(fragsize < MCLBYTES, 1336 ("fragment size %u too big!", fragsize)); 1337 if (fragsize > MHLEN) 1338 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1339 else 1340 m = m_gethdr(M_DONTWAIT, MT_DATA); 1341 if (m == NULL) 1342 goto bad; 1343 /* leave room to prepend any cipher header */ 1344 m_align(m, fragsize - ciphdrsize); 1345 1346 /* 1347 * Form the header in the fragment. Note that since 1348 * we mark the first fragment with the MORE_FRAG bit 1349 * it automatically is propagated to each fragment; we 1350 * need only clear it on the last fragment (done below). 1351 */ 1352 whf = mtod(m, struct ieee80211_frame *); 1353 memcpy(whf, wh, hdrsize); 1354 *(uint16_t *)&whf->i_seq[0] |= htole16( 1355 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1356 IEEE80211_SEQ_FRAG_SHIFT); 1357 fragno++; 1358 1359 payload = fragsize - totalhdrsize; 1360 /* NB: destination is known to be contiguous */ 1361 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1362 m->m_len = hdrsize + payload; 1363 m->m_pkthdr.len = hdrsize + payload; 1364 m->m_flags |= M_FRAG; 1365 1366 /* chain up the fragment */ 1367 prev->m_nextpkt = m; 1368 prev = m; 1369 1370 /* deduct fragment just formed */ 1371 remainder -= payload; 1372 off += payload; 1373 } while (remainder != 0); 1374 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1375 1376 /* strip first mbuf now that everything has been copied */ 1377 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1378 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1379 1380 vap->iv_stats.is_tx_fragframes++; 1381 vap->iv_stats.is_tx_frags += fragno-1; 1382 1383 return 1; 1384bad: 1385 /* reclaim fragments but leave original frame for caller to free */ 1386 for (m = m0->m_nextpkt; m != NULL; m = next) { 1387 next = m->m_nextpkt; 1388 m->m_nextpkt = NULL; /* XXX paranoid */ 1389 m_freem(m); 1390 } 1391 m0->m_nextpkt = NULL; 1392 return 0; 1393} 1394 1395/* 1396 * Add a supported rates element id to a frame. 1397 */ 1398static uint8_t * 1399ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1400{ 1401 int nrates; 1402 1403 *frm++ = IEEE80211_ELEMID_RATES; 1404 nrates = rs->rs_nrates; 1405 if (nrates > IEEE80211_RATE_SIZE) 1406 nrates = IEEE80211_RATE_SIZE; 1407 *frm++ = nrates; 1408 memcpy(frm, rs->rs_rates, nrates); 1409 return frm + nrates; 1410} 1411 1412/* 1413 * Add an extended supported rates element id to a frame. 1414 */ 1415static uint8_t * 1416ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1417{ 1418 /* 1419 * Add an extended supported rates element if operating in 11g mode. 1420 */ 1421 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1422 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1423 *frm++ = IEEE80211_ELEMID_XRATES; 1424 *frm++ = nrates; 1425 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1426 frm += nrates; 1427 } 1428 return frm; 1429} 1430 1431/* 1432 * Add an ssid element to a frame. 1433 */ 1434static uint8_t * 1435ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1436{ 1437 *frm++ = IEEE80211_ELEMID_SSID; 1438 *frm++ = len; 1439 memcpy(frm, ssid, len); 1440 return frm + len; 1441} 1442 1443/* 1444 * Add an erp element to a frame. 1445 */ 1446static uint8_t * 1447ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1448{ 1449 uint8_t erp; 1450 1451 *frm++ = IEEE80211_ELEMID_ERP; 1452 *frm++ = 1; 1453 erp = 0; 1454 if (ic->ic_nonerpsta != 0) 1455 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1456 if (ic->ic_flags & IEEE80211_F_USEPROT) 1457 erp |= IEEE80211_ERP_USE_PROTECTION; 1458 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1459 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1460 *frm++ = erp; 1461 return frm; 1462} 1463 1464/* 1465 * Add a CFParams element to a frame. 1466 */ 1467static uint8_t * 1468ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1469{ 1470#define ADDSHORT(frm, v) do { \ 1471 frm[0] = (v) & 0xff; \ 1472 frm[1] = (v) >> 8; \ 1473 frm += 2; \ 1474} while (0) 1475 *frm++ = IEEE80211_ELEMID_CFPARMS; 1476 *frm++ = 6; 1477 *frm++ = 0; /* CFP count */ 1478 *frm++ = 2; /* CFP period */ 1479 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1480 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1481 return frm; 1482#undef ADDSHORT 1483} 1484 1485static __inline uint8_t * 1486add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1487{ 1488 memcpy(frm, ie->ie_data, ie->ie_len); 1489 return frm + ie->ie_len; 1490} 1491 1492static __inline uint8_t * 1493add_ie(uint8_t *frm, const uint8_t *ie) 1494{ 1495 memcpy(frm, ie, 2 + ie[1]); 1496 return frm + 2 + ie[1]; 1497} 1498 1499#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1500/* 1501 * Add a WME information element to a frame. 1502 */ 1503static uint8_t * 1504ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1505{ 1506 static const struct ieee80211_wme_info info = { 1507 .wme_id = IEEE80211_ELEMID_VENDOR, 1508 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1509 .wme_oui = { WME_OUI_BYTES }, 1510 .wme_type = WME_OUI_TYPE, 1511 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1512 .wme_version = WME_VERSION, 1513 .wme_info = 0, 1514 }; 1515 memcpy(frm, &info, sizeof(info)); 1516 return frm + sizeof(info); 1517} 1518 1519/* 1520 * Add a WME parameters element to a frame. 1521 */ 1522static uint8_t * 1523ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1524{ 1525#define SM(_v, _f) (((_v) << _f##_S) & _f) 1526#define ADDSHORT(frm, v) do { \ 1527 frm[0] = (v) & 0xff; \ 1528 frm[1] = (v) >> 8; \ 1529 frm += 2; \ 1530} while (0) 1531 /* NB: this works 'cuz a param has an info at the front */ 1532 static const struct ieee80211_wme_info param = { 1533 .wme_id = IEEE80211_ELEMID_VENDOR, 1534 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1535 .wme_oui = { WME_OUI_BYTES }, 1536 .wme_type = WME_OUI_TYPE, 1537 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1538 .wme_version = WME_VERSION, 1539 }; 1540 int i; 1541 1542 memcpy(frm, ¶m, sizeof(param)); 1543 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1544 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1545 *frm++ = 0; /* reserved field */ 1546 for (i = 0; i < WME_NUM_AC; i++) { 1547 const struct wmeParams *ac = 1548 &wme->wme_bssChanParams.cap_wmeParams[i]; 1549 *frm++ = SM(i, WME_PARAM_ACI) 1550 | SM(ac->wmep_acm, WME_PARAM_ACM) 1551 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1552 ; 1553 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1554 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1555 ; 1556 ADDSHORT(frm, ac->wmep_txopLimit); 1557 } 1558 return frm; 1559#undef SM 1560#undef ADDSHORT 1561} 1562#undef WME_OUI_BYTES 1563 1564#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1565/* 1566 * Add a WME information element to a frame. 1567 */ 1568static uint8_t * 1569ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1570{ 1571 static const struct ieee80211_ath_ie info = { 1572 .ath_id = IEEE80211_ELEMID_VENDOR, 1573 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1574 .ath_oui = { ATH_OUI_BYTES }, 1575 .ath_oui_type = ATH_OUI_TYPE, 1576 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1577 .ath_version = ATH_OUI_VERSION, 1578 }; 1579 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1580 1581 memcpy(frm, &info, sizeof(info)); 1582 ath->ath_capability = caps; 1583 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1584 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1585 return frm + sizeof(info); 1586} 1587#undef ATH_OUI_BYTES 1588 1589/* 1590 * Add an 11h Power Constraint element to a frame. 1591 */ 1592static uint8_t * 1593ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1594{ 1595 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1596 /* XXX per-vap tx power limit? */ 1597 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1598 1599 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1600 frm[1] = 1; 1601 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1602 return frm + 3; 1603} 1604 1605/* 1606 * Add an 11h Power Capability element to a frame. 1607 */ 1608static uint8_t * 1609ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1610{ 1611 frm[0] = IEEE80211_ELEMID_PWRCAP; 1612 frm[1] = 2; 1613 frm[2] = c->ic_minpower; 1614 frm[3] = c->ic_maxpower; 1615 return frm + 4; 1616} 1617 1618/* 1619 * Add an 11h Supported Channels element to a frame. 1620 */ 1621static uint8_t * 1622ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1623{ 1624 static const int ielen = 26; 1625 1626 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1627 frm[1] = ielen; 1628 /* XXX not correct */ 1629 memcpy(frm+2, ic->ic_chan_avail, ielen); 1630 return frm + 2 + ielen; 1631} 1632 1633/* 1634 * Add an 11h Channel Switch Announcement element to a frame. 1635 * Note that we use the per-vap CSA count to adjust the global 1636 * counter so we can use this routine to form probe response 1637 * frames and get the current count. 1638 */ 1639static uint8_t * 1640ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1641{ 1642 struct ieee80211com *ic = vap->iv_ic; 1643 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1644 1645 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1646 csa->csa_len = 3; 1647 csa->csa_mode = 1; /* XXX force quiet on channel */ 1648 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1649 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1650 return frm + sizeof(*csa); 1651} 1652 1653/* 1654 * Add an 11h country information element to a frame. 1655 */ 1656static uint8_t * 1657ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1658{ 1659 1660 if (ic->ic_countryie == NULL || 1661 ic->ic_countryie_chan != ic->ic_bsschan) { 1662 /* 1663 * Handle lazy construction of ie. This is done on 1664 * first use and after a channel change that requires 1665 * re-calculation. 1666 */ 1667 if (ic->ic_countryie != NULL) 1668 free(ic->ic_countryie, M_80211_NODE_IE); 1669 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1670 if (ic->ic_countryie == NULL) 1671 return frm; 1672 ic->ic_countryie_chan = ic->ic_bsschan; 1673 } 1674 return add_appie(frm, ic->ic_countryie); 1675} 1676 1677/* 1678 * Send a probe request frame with the specified ssid 1679 * and any optional information element data. 1680 */ 1681int 1682ieee80211_send_probereq(struct ieee80211_node *ni, 1683 const uint8_t sa[IEEE80211_ADDR_LEN], 1684 const uint8_t da[IEEE80211_ADDR_LEN], 1685 const uint8_t bssid[IEEE80211_ADDR_LEN], 1686 const uint8_t *ssid, size_t ssidlen) 1687{ 1688 struct ieee80211vap *vap = ni->ni_vap; 1689 struct ieee80211com *ic = ni->ni_ic; 1690 const struct ieee80211_txparam *tp; 1691 struct ieee80211_bpf_params params; 1692 struct ieee80211_frame *wh; 1693 const struct ieee80211_rateset *rs; 1694 struct mbuf *m; 1695 uint8_t *frm; 1696 1697 if (vap->iv_state == IEEE80211_S_CAC) { 1698 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1699 "block %s frame in CAC state", "probe request"); 1700 vap->iv_stats.is_tx_badstate++; 1701 return EIO; /* XXX */ 1702 } 1703 1704 /* 1705 * Hold a reference on the node so it doesn't go away until after 1706 * the xmit is complete all the way in the driver. On error we 1707 * will remove our reference. 1708 */ 1709 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1710 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1711 __func__, __LINE__, 1712 ni, ether_sprintf(ni->ni_macaddr), 1713 ieee80211_node_refcnt(ni)+1); 1714 ieee80211_ref_node(ni); 1715 1716 /* 1717 * prreq frame format 1718 * [tlv] ssid 1719 * [tlv] supported rates 1720 * [tlv] RSN (optional) 1721 * [tlv] extended supported rates 1722 * [tlv] WPA (optional) 1723 * [tlv] user-specified ie's 1724 */ 1725 m = ieee80211_getmgtframe(&frm, 1726 ic->ic_headroom + sizeof(struct ieee80211_frame), 1727 2 + IEEE80211_NWID_LEN 1728 + 2 + IEEE80211_RATE_SIZE 1729 + sizeof(struct ieee80211_ie_wpa) 1730 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1731 + sizeof(struct ieee80211_ie_wpa) 1732 + (vap->iv_appie_probereq != NULL ? 1733 vap->iv_appie_probereq->ie_len : 0) 1734 ); 1735 if (m == NULL) { 1736 vap->iv_stats.is_tx_nobuf++; 1737 ieee80211_free_node(ni); 1738 return ENOMEM; 1739 } 1740 1741 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1742 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1743 frm = ieee80211_add_rates(frm, rs); 1744 if (vap->iv_flags & IEEE80211_F_WPA2) { 1745 if (vap->iv_rsn_ie != NULL) 1746 frm = add_ie(frm, vap->iv_rsn_ie); 1747 /* XXX else complain? */ 1748 } 1749 frm = ieee80211_add_xrates(frm, rs); 1750 if (vap->iv_flags & IEEE80211_F_WPA1) { 1751 if (vap->iv_wpa_ie != NULL) 1752 frm = add_ie(frm, vap->iv_wpa_ie); 1753 /* XXX else complain? */ 1754 } 1755 if (vap->iv_appie_probereq != NULL) 1756 frm = add_appie(frm, vap->iv_appie_probereq); 1757 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1758 1759 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1760 ("leading space %zd", M_LEADINGSPACE(m))); 1761 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1762 if (m == NULL) { 1763 /* NB: cannot happen */ 1764 ieee80211_free_node(ni); 1765 return ENOMEM; 1766 } 1767 1768 wh = mtod(m, struct ieee80211_frame *); 1769 ieee80211_send_setup(ni, wh, 1770 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1771 IEEE80211_NONQOS_TID, sa, da, bssid); 1772 /* XXX power management? */ 1773 1774 M_WME_SETAC(m, WME_AC_BE); 1775 1776 IEEE80211_NODE_STAT(ni, tx_probereq); 1777 IEEE80211_NODE_STAT(ni, tx_mgmt); 1778 1779 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1780 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1781 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1782 ssidlen, ssid); 1783 1784 memset(¶ms, 0, sizeof(params)); 1785 params.ibp_pri = M_WME_GETAC(m); 1786 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1787 params.ibp_rate0 = tp->mgmtrate; 1788 if (IEEE80211_IS_MULTICAST(da)) { 1789 params.ibp_flags |= IEEE80211_BPF_NOACK; 1790 params.ibp_try0 = 1; 1791 } else 1792 params.ibp_try0 = tp->maxretry; 1793 params.ibp_power = ni->ni_txpower; 1794 return ic->ic_raw_xmit(ni, m, ¶ms); 1795} 1796 1797/* 1798 * Calculate capability information for mgt frames. 1799 */ 1800static uint16_t 1801getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1802{ 1803 struct ieee80211com *ic = vap->iv_ic; 1804 uint16_t capinfo; 1805 1806 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1807 1808 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1809 capinfo = IEEE80211_CAPINFO_ESS; 1810 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1811 capinfo = IEEE80211_CAPINFO_IBSS; 1812 else 1813 capinfo = 0; 1814 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1815 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1816 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1817 IEEE80211_IS_CHAN_2GHZ(chan)) 1818 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1819 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1820 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1821 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1822 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1823 return capinfo; 1824} 1825 1826/* 1827 * Send a management frame. The node is for the destination (or ic_bss 1828 * when in station mode). Nodes other than ic_bss have their reference 1829 * count bumped to reflect our use for an indeterminant time. 1830 */ 1831int 1832ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1833{ 1834#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1835#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1836 struct ieee80211vap *vap = ni->ni_vap; 1837 struct ieee80211com *ic = ni->ni_ic; 1838 struct ieee80211_node *bss = vap->iv_bss; 1839 struct ieee80211_bpf_params params; 1840 struct mbuf *m; 1841 uint8_t *frm; 1842 uint16_t capinfo; 1843 int has_challenge, is_shared_key, ret, status; 1844 1845 KASSERT(ni != NULL, ("null node")); 1846 1847 /* 1848 * Hold a reference on the node so it doesn't go away until after 1849 * the xmit is complete all the way in the driver. On error we 1850 * will remove our reference. 1851 */ 1852 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1853 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1854 __func__, __LINE__, 1855 ni, ether_sprintf(ni->ni_macaddr), 1856 ieee80211_node_refcnt(ni)+1); 1857 ieee80211_ref_node(ni); 1858 1859 memset(¶ms, 0, sizeof(params)); 1860 switch (type) { 1861 1862 case IEEE80211_FC0_SUBTYPE_AUTH: 1863 status = arg >> 16; 1864 arg &= 0xffff; 1865 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1866 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1867 ni->ni_challenge != NULL); 1868 1869 /* 1870 * Deduce whether we're doing open authentication or 1871 * shared key authentication. We do the latter if 1872 * we're in the middle of a shared key authentication 1873 * handshake or if we're initiating an authentication 1874 * request and configured to use shared key. 1875 */ 1876 is_shared_key = has_challenge || 1877 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1878 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1879 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1880 1881 m = ieee80211_getmgtframe(&frm, 1882 ic->ic_headroom + sizeof(struct ieee80211_frame), 1883 3 * sizeof(uint16_t) 1884 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1885 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1886 ); 1887 if (m == NULL) 1888 senderr(ENOMEM, is_tx_nobuf); 1889 1890 ((uint16_t *)frm)[0] = 1891 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1892 : htole16(IEEE80211_AUTH_ALG_OPEN); 1893 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1894 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1895 1896 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1897 ((uint16_t *)frm)[3] = 1898 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1899 IEEE80211_ELEMID_CHALLENGE); 1900 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1901 IEEE80211_CHALLENGE_LEN); 1902 m->m_pkthdr.len = m->m_len = 1903 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1904 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1905 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1906 "request encrypt frame (%s)", __func__); 1907 /* mark frame for encryption */ 1908 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1909 } 1910 } else 1911 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1912 1913 /* XXX not right for shared key */ 1914 if (status == IEEE80211_STATUS_SUCCESS) 1915 IEEE80211_NODE_STAT(ni, tx_auth); 1916 else 1917 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1918 1919 if (vap->iv_opmode == IEEE80211_M_STA) 1920 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1921 (void *) vap->iv_state); 1922 break; 1923 1924 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1925 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1926 "send station deauthenticate (reason %d)", arg); 1927 m = ieee80211_getmgtframe(&frm, 1928 ic->ic_headroom + sizeof(struct ieee80211_frame), 1929 sizeof(uint16_t)); 1930 if (m == NULL) 1931 senderr(ENOMEM, is_tx_nobuf); 1932 *(uint16_t *)frm = htole16(arg); /* reason */ 1933 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1934 1935 IEEE80211_NODE_STAT(ni, tx_deauth); 1936 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1937 1938 ieee80211_node_unauthorize(ni); /* port closed */ 1939 break; 1940 1941 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1942 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1943 /* 1944 * asreq frame format 1945 * [2] capability information 1946 * [2] listen interval 1947 * [6*] current AP address (reassoc only) 1948 * [tlv] ssid 1949 * [tlv] supported rates 1950 * [tlv] extended supported rates 1951 * [4] power capability (optional) 1952 * [28] supported channels (optional) 1953 * [tlv] HT capabilities 1954 * [tlv] WME (optional) 1955 * [tlv] Vendor OUI HT capabilities (optional) 1956 * [tlv] Atheros capabilities (if negotiated) 1957 * [tlv] AppIE's (optional) 1958 */ 1959 m = ieee80211_getmgtframe(&frm, 1960 ic->ic_headroom + sizeof(struct ieee80211_frame), 1961 sizeof(uint16_t) 1962 + sizeof(uint16_t) 1963 + IEEE80211_ADDR_LEN 1964 + 2 + IEEE80211_NWID_LEN 1965 + 2 + IEEE80211_RATE_SIZE 1966 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1967 + 4 1968 + 2 + 26 1969 + sizeof(struct ieee80211_wme_info) 1970 + sizeof(struct ieee80211_ie_htcap) 1971 + 4 + sizeof(struct ieee80211_ie_htcap) 1972 + sizeof(struct ieee80211_ath_ie) 1973 + (vap->iv_appie_wpa != NULL ? 1974 vap->iv_appie_wpa->ie_len : 0) 1975 + (vap->iv_appie_assocreq != NULL ? 1976 vap->iv_appie_assocreq->ie_len : 0) 1977 ); 1978 if (m == NULL) 1979 senderr(ENOMEM, is_tx_nobuf); 1980 1981 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1982 ("wrong mode %u", vap->iv_opmode)); 1983 capinfo = IEEE80211_CAPINFO_ESS; 1984 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1985 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1986 /* 1987 * NB: Some 11a AP's reject the request when 1988 * short premable is set. 1989 */ 1990 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1991 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1992 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1993 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1994 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1995 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1996 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1997 (vap->iv_flags & IEEE80211_F_DOTH)) 1998 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1999 *(uint16_t *)frm = htole16(capinfo); 2000 frm += 2; 2001 2002 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2003 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2004 bss->ni_intval)); 2005 frm += 2; 2006 2007 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2008 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2009 frm += IEEE80211_ADDR_LEN; 2010 } 2011 2012 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2013 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2014 if (vap->iv_flags & IEEE80211_F_WPA2) { 2015 if (vap->iv_rsn_ie != NULL) 2016 frm = add_ie(frm, vap->iv_rsn_ie); 2017 /* XXX else complain? */ 2018 } 2019 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2020 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2021 frm = ieee80211_add_powercapability(frm, 2022 ic->ic_curchan); 2023 frm = ieee80211_add_supportedchannels(frm, ic); 2024 } 2025 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 2026 ni->ni_ies.htcap_ie != NULL && 2027 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2028 frm = ieee80211_add_htcap(frm, ni); 2029 if (vap->iv_flags & IEEE80211_F_WPA1) { 2030 if (vap->iv_wpa_ie != NULL) 2031 frm = add_ie(frm, vap->iv_wpa_ie); 2032 /* XXX else complain */ 2033 } 2034 if ((ic->ic_flags & IEEE80211_F_WME) && 2035 ni->ni_ies.wme_ie != NULL) 2036 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2037 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 2038 ni->ni_ies.htcap_ie != NULL && 2039 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2040 frm = ieee80211_add_htcap_vendor(frm, ni); 2041 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2042 frm = ieee80211_add_ath(frm, 2043 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2044 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 2045 ni->ni_authmode != IEEE80211_AUTH_8021X && 2046 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 2047 vap->iv_def_txkey : 0x7fff); 2048 if (vap->iv_appie_assocreq != NULL) 2049 frm = add_appie(frm, vap->iv_appie_assocreq); 2050 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2051 2052 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2053 (void *) vap->iv_state); 2054 break; 2055 2056 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2057 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2058 /* 2059 * asresp frame format 2060 * [2] capability information 2061 * [2] status 2062 * [2] association ID 2063 * [tlv] supported rates 2064 * [tlv] extended supported rates 2065 * [tlv] HT capabilities (standard, if STA enabled) 2066 * [tlv] HT information (standard, if STA enabled) 2067 * [tlv] WME (if configured and STA enabled) 2068 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2069 * [tlv] HT information (vendor OUI, if STA enabled) 2070 * [tlv] Atheros capabilities (if STA enabled) 2071 * [tlv] AppIE's (optional) 2072 */ 2073 m = ieee80211_getmgtframe(&frm, 2074 ic->ic_headroom + sizeof(struct ieee80211_frame), 2075 sizeof(uint16_t) 2076 + sizeof(uint16_t) 2077 + sizeof(uint16_t) 2078 + 2 + IEEE80211_RATE_SIZE 2079 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2080 + sizeof(struct ieee80211_ie_htcap) + 4 2081 + sizeof(struct ieee80211_ie_htinfo) + 4 2082 + sizeof(struct ieee80211_wme_param) 2083 + sizeof(struct ieee80211_ath_ie) 2084 + (vap->iv_appie_assocresp != NULL ? 2085 vap->iv_appie_assocresp->ie_len : 0) 2086 ); 2087 if (m == NULL) 2088 senderr(ENOMEM, is_tx_nobuf); 2089 2090 capinfo = getcapinfo(vap, bss->ni_chan); 2091 *(uint16_t *)frm = htole16(capinfo); 2092 frm += 2; 2093 2094 *(uint16_t *)frm = htole16(arg); /* status */ 2095 frm += 2; 2096 2097 if (arg == IEEE80211_STATUS_SUCCESS) { 2098 *(uint16_t *)frm = htole16(ni->ni_associd); 2099 IEEE80211_NODE_STAT(ni, tx_assoc); 2100 } else 2101 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2102 frm += 2; 2103 2104 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2105 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2106 /* NB: respond according to what we received */ 2107 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2108 frm = ieee80211_add_htcap(frm, ni); 2109 frm = ieee80211_add_htinfo(frm, ni); 2110 } 2111 if ((vap->iv_flags & IEEE80211_F_WME) && 2112 ni->ni_ies.wme_ie != NULL) 2113 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2114 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2115 frm = ieee80211_add_htcap_vendor(frm, ni); 2116 frm = ieee80211_add_htinfo_vendor(frm, ni); 2117 } 2118 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2119 frm = ieee80211_add_ath(frm, 2120 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2121 ni->ni_ath_defkeyix); 2122 if (vap->iv_appie_assocresp != NULL) 2123 frm = add_appie(frm, vap->iv_appie_assocresp); 2124 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2125 break; 2126 2127 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2128 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2129 "send station disassociate (reason %d)", arg); 2130 m = ieee80211_getmgtframe(&frm, 2131 ic->ic_headroom + sizeof(struct ieee80211_frame), 2132 sizeof(uint16_t)); 2133 if (m == NULL) 2134 senderr(ENOMEM, is_tx_nobuf); 2135 *(uint16_t *)frm = htole16(arg); /* reason */ 2136 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2137 2138 IEEE80211_NODE_STAT(ni, tx_disassoc); 2139 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2140 break; 2141 2142 default: 2143 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2144 "invalid mgmt frame type %u", type); 2145 senderr(EINVAL, is_tx_unknownmgt); 2146 /* NOTREACHED */ 2147 } 2148 2149 /* NB: force non-ProbeResp frames to the highest queue */ 2150 params.ibp_pri = WME_AC_VO; 2151 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2152 /* NB: we know all frames are unicast */ 2153 params.ibp_try0 = bss->ni_txparms->maxretry; 2154 params.ibp_power = bss->ni_txpower; 2155 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2156bad: 2157 ieee80211_free_node(ni); 2158 return ret; 2159#undef senderr 2160#undef HTFLAGS 2161} 2162 2163/* 2164 * Return an mbuf with a probe response frame in it. 2165 * Space is left to prepend and 802.11 header at the 2166 * front but it's left to the caller to fill in. 2167 */ 2168struct mbuf * 2169ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2170{ 2171 struct ieee80211vap *vap = bss->ni_vap; 2172 struct ieee80211com *ic = bss->ni_ic; 2173 const struct ieee80211_rateset *rs; 2174 struct mbuf *m; 2175 uint16_t capinfo; 2176 uint8_t *frm; 2177 2178 /* 2179 * probe response frame format 2180 * [8] time stamp 2181 * [2] beacon interval 2182 * [2] cabability information 2183 * [tlv] ssid 2184 * [tlv] supported rates 2185 * [tlv] parameter set (FH/DS) 2186 * [tlv] parameter set (IBSS) 2187 * [tlv] country (optional) 2188 * [3] power control (optional) 2189 * [5] channel switch announcement (CSA) (optional) 2190 * [tlv] extended rate phy (ERP) 2191 * [tlv] extended supported rates 2192 * [tlv] RSN (optional) 2193 * [tlv] HT capabilities 2194 * [tlv] HT information 2195 * [tlv] WPA (optional) 2196 * [tlv] WME (optional) 2197 * [tlv] Vendor OUI HT capabilities (optional) 2198 * [tlv] Vendor OUI HT information (optional) 2199 * [tlv] Atheros capabilities 2200 * [tlv] AppIE's (optional) 2201 */ 2202 m = ieee80211_getmgtframe(&frm, 2203 ic->ic_headroom + sizeof(struct ieee80211_frame), 2204 8 2205 + sizeof(uint16_t) 2206 + sizeof(uint16_t) 2207 + 2 + IEEE80211_NWID_LEN 2208 + 2 + IEEE80211_RATE_SIZE 2209 + 7 /* max(7,3) */ 2210 + IEEE80211_COUNTRY_MAX_SIZE 2211 + 3 2212 + sizeof(struct ieee80211_csa_ie) 2213 + 3 2214 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2215 + sizeof(struct ieee80211_ie_wpa) 2216 + sizeof(struct ieee80211_ie_htcap) 2217 + sizeof(struct ieee80211_ie_htinfo) 2218 + sizeof(struct ieee80211_ie_wpa) 2219 + sizeof(struct ieee80211_wme_param) 2220 + 4 + sizeof(struct ieee80211_ie_htcap) 2221 + 4 + sizeof(struct ieee80211_ie_htinfo) 2222 + sizeof(struct ieee80211_ath_ie) 2223 + (vap->iv_appie_proberesp != NULL ? 2224 vap->iv_appie_proberesp->ie_len : 0) 2225 ); 2226 if (m == NULL) { 2227 vap->iv_stats.is_tx_nobuf++; 2228 return NULL; 2229 } 2230 2231 memset(frm, 0, 8); /* timestamp should be filled later */ 2232 frm += 8; 2233 *(uint16_t *)frm = htole16(bss->ni_intval); 2234 frm += 2; 2235 capinfo = getcapinfo(vap, bss->ni_chan); 2236 *(uint16_t *)frm = htole16(capinfo); 2237 frm += 2; 2238 2239 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2240 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2241 frm = ieee80211_add_rates(frm, rs); 2242 2243 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2244 *frm++ = IEEE80211_ELEMID_FHPARMS; 2245 *frm++ = 5; 2246 *frm++ = bss->ni_fhdwell & 0x00ff; 2247 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2248 *frm++ = IEEE80211_FH_CHANSET( 2249 ieee80211_chan2ieee(ic, bss->ni_chan)); 2250 *frm++ = IEEE80211_FH_CHANPAT( 2251 ieee80211_chan2ieee(ic, bss->ni_chan)); 2252 *frm++ = bss->ni_fhindex; 2253 } else { 2254 *frm++ = IEEE80211_ELEMID_DSPARMS; 2255 *frm++ = 1; 2256 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2257 } 2258 2259 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2260 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2261 *frm++ = 2; 2262 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2263 } 2264 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2265 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2266 frm = ieee80211_add_countryie(frm, ic); 2267 if (vap->iv_flags & IEEE80211_F_DOTH) { 2268 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2269 frm = ieee80211_add_powerconstraint(frm, vap); 2270 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2271 frm = ieee80211_add_csa(frm, vap); 2272 } 2273 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2274 frm = ieee80211_add_erp(frm, ic); 2275 frm = ieee80211_add_xrates(frm, rs); 2276 if (vap->iv_flags & IEEE80211_F_WPA2) { 2277 if (vap->iv_rsn_ie != NULL) 2278 frm = add_ie(frm, vap->iv_rsn_ie); 2279 /* XXX else complain? */ 2280 } 2281 /* 2282 * NB: legacy 11b clients do not get certain ie's. 2283 * The caller identifies such clients by passing 2284 * a token in legacy to us. Could expand this to be 2285 * any legacy client for stuff like HT ie's. 2286 */ 2287 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2288 legacy != IEEE80211_SEND_LEGACY_11B) { 2289 frm = ieee80211_add_htcap(frm, bss); 2290 frm = ieee80211_add_htinfo(frm, bss); 2291 } 2292 if (vap->iv_flags & IEEE80211_F_WPA1) { 2293 if (vap->iv_wpa_ie != NULL) 2294 frm = add_ie(frm, vap->iv_wpa_ie); 2295 /* XXX else complain? */ 2296 } 2297 if (vap->iv_flags & IEEE80211_F_WME) 2298 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2299 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2300 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2301 legacy != IEEE80211_SEND_LEGACY_11B) { 2302 frm = ieee80211_add_htcap_vendor(frm, bss); 2303 frm = ieee80211_add_htinfo_vendor(frm, bss); 2304 } 2305 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2306 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2307 bss->ni_ath_defkeyix); 2308 if (vap->iv_appie_proberesp != NULL) 2309 frm = add_appie(frm, vap->iv_appie_proberesp); 2310 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2311 2312 return m; 2313} 2314 2315/* 2316 * Send a probe response frame to the specified mac address. 2317 * This does not go through the normal mgt frame api so we 2318 * can specify the destination address and re-use the bss node 2319 * for the sta reference. 2320 */ 2321int 2322ieee80211_send_proberesp(struct ieee80211vap *vap, 2323 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2324{ 2325 struct ieee80211_node *bss = vap->iv_bss; 2326 struct ieee80211com *ic = vap->iv_ic; 2327 struct ieee80211_frame *wh; 2328 struct mbuf *m; 2329 2330 if (vap->iv_state == IEEE80211_S_CAC) { 2331 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2332 "block %s frame in CAC state", "probe response"); 2333 vap->iv_stats.is_tx_badstate++; 2334 return EIO; /* XXX */ 2335 } 2336 2337 /* 2338 * Hold a reference on the node so it doesn't go away until after 2339 * the xmit is complete all the way in the driver. On error we 2340 * will remove our reference. 2341 */ 2342 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2343 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2344 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2345 ieee80211_node_refcnt(bss)+1); 2346 ieee80211_ref_node(bss); 2347 2348 m = ieee80211_alloc_proberesp(bss, legacy); 2349 if (m == NULL) { 2350 ieee80211_free_node(bss); 2351 return ENOMEM; 2352 } 2353 2354 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2355 KASSERT(m != NULL, ("no room for header")); 2356 2357 wh = mtod(m, struct ieee80211_frame *); 2358 ieee80211_send_setup(bss, wh, 2359 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2360 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2361 /* XXX power management? */ 2362 2363 M_WME_SETAC(m, WME_AC_BE); 2364 2365 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2366 "send probe resp on channel %u to %s%s\n", 2367 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2368 legacy ? " <legacy>" : ""); 2369 IEEE80211_NODE_STAT(bss, tx_mgmt); 2370 2371 return ic->ic_raw_xmit(bss, m, NULL); 2372} 2373 2374/* 2375 * Allocate and build a RTS (Request To Send) control frame. 2376 */ 2377struct mbuf * 2378ieee80211_alloc_rts(struct ieee80211com *ic, 2379 const uint8_t ra[IEEE80211_ADDR_LEN], 2380 const uint8_t ta[IEEE80211_ADDR_LEN], 2381 uint16_t dur) 2382{ 2383 struct ieee80211_frame_rts *rts; 2384 struct mbuf *m; 2385 2386 /* XXX honor ic_headroom */ 2387 m = m_gethdr(M_DONTWAIT, MT_DATA); 2388 if (m != NULL) { 2389 rts = mtod(m, struct ieee80211_frame_rts *); 2390 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2391 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2392 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2393 *(u_int16_t *)rts->i_dur = htole16(dur); 2394 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2395 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2396 2397 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2398 } 2399 return m; 2400} 2401 2402/* 2403 * Allocate and build a CTS (Clear To Send) control frame. 2404 */ 2405struct mbuf * 2406ieee80211_alloc_cts(struct ieee80211com *ic, 2407 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2408{ 2409 struct ieee80211_frame_cts *cts; 2410 struct mbuf *m; 2411 2412 /* XXX honor ic_headroom */ 2413 m = m_gethdr(M_DONTWAIT, MT_DATA); 2414 if (m != NULL) { 2415 cts = mtod(m, struct ieee80211_frame_cts *); 2416 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2417 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2418 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2419 *(u_int16_t *)cts->i_dur = htole16(dur); 2420 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2421 2422 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2423 } 2424 return m; 2425} 2426 2427static void 2428ieee80211_tx_mgt_timeout(void *arg) 2429{ 2430 struct ieee80211_node *ni = arg; 2431 struct ieee80211vap *vap = ni->ni_vap; 2432 2433 if (vap->iv_state != IEEE80211_S_INIT && 2434 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2435 /* 2436 * NB: it's safe to specify a timeout as the reason here; 2437 * it'll only be used in the right state. 2438 */ 2439 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2440 IEEE80211_SCAN_FAIL_TIMEOUT); 2441 } 2442} 2443 2444static void 2445ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2446{ 2447 struct ieee80211vap *vap = ni->ni_vap; 2448 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2449 2450 /* 2451 * Frame transmit completed; arrange timer callback. If 2452 * transmit was successfuly we wait for response. Otherwise 2453 * we arrange an immediate callback instead of doing the 2454 * callback directly since we don't know what state the driver 2455 * is in (e.g. what locks it is holding). This work should 2456 * not be too time-critical and not happen too often so the 2457 * added overhead is acceptable. 2458 * 2459 * XXX what happens if !acked but response shows up before callback? 2460 */ 2461 if (vap->iv_state == ostate) 2462 callout_reset(&vap->iv_mgtsend, 2463 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2464 ieee80211_tx_mgt_timeout, ni); 2465} 2466 2467static void 2468ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2469 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2470{ 2471 struct ieee80211vap *vap = ni->ni_vap; 2472 struct ieee80211com *ic = ni->ni_ic; 2473 struct ieee80211_rateset *rs = &ni->ni_rates; 2474 uint16_t capinfo; 2475 2476 /* 2477 * beacon frame format 2478 * [8] time stamp 2479 * [2] beacon interval 2480 * [2] cabability information 2481 * [tlv] ssid 2482 * [tlv] supported rates 2483 * [3] parameter set (DS) 2484 * [8] CF parameter set (optional) 2485 * [tlv] parameter set (IBSS/TIM) 2486 * [tlv] country (optional) 2487 * [3] power control (optional) 2488 * [5] channel switch announcement (CSA) (optional) 2489 * [tlv] extended rate phy (ERP) 2490 * [tlv] extended supported rates 2491 * [tlv] RSN parameters 2492 * [tlv] HT capabilities 2493 * [tlv] HT information 2494 * XXX Vendor-specific OIDs (e.g. Atheros) 2495 * [tlv] WPA parameters 2496 * [tlv] WME parameters 2497 * [tlv] Vendor OUI HT capabilities (optional) 2498 * [tlv] Vendor OUI HT information (optional) 2499 * [tlv] application data (optional) 2500 */ 2501 2502 memset(bo, 0, sizeof(*bo)); 2503 2504 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2505 frm += 8; 2506 *(uint16_t *)frm = htole16(ni->ni_intval); 2507 frm += 2; 2508 capinfo = getcapinfo(vap, ni->ni_chan); 2509 bo->bo_caps = (uint16_t *)frm; 2510 *(uint16_t *)frm = htole16(capinfo); 2511 frm += 2; 2512 *frm++ = IEEE80211_ELEMID_SSID; 2513 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2514 *frm++ = ni->ni_esslen; 2515 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2516 frm += ni->ni_esslen; 2517 } else 2518 *frm++ = 0; 2519 frm = ieee80211_add_rates(frm, rs); 2520 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2521 *frm++ = IEEE80211_ELEMID_DSPARMS; 2522 *frm++ = 1; 2523 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2524 } 2525 if (ic->ic_flags & IEEE80211_F_PCF) { 2526 bo->bo_cfp = frm; 2527 frm = ieee80211_add_cfparms(frm, ic); 2528 } 2529 bo->bo_tim = frm; 2530 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2531 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2532 *frm++ = 2; 2533 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2534 bo->bo_tim_len = 0; 2535 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2536 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2537 2538 tie->tim_ie = IEEE80211_ELEMID_TIM; 2539 tie->tim_len = 4; /* length */ 2540 tie->tim_count = 0; /* DTIM count */ 2541 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2542 tie->tim_bitctl = 0; /* bitmap control */ 2543 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2544 frm += sizeof(struct ieee80211_tim_ie); 2545 bo->bo_tim_len = 1; 2546 } 2547 bo->bo_tim_trailer = frm; 2548 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2549 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2550 frm = ieee80211_add_countryie(frm, ic); 2551 if (vap->iv_flags & IEEE80211_F_DOTH) { 2552 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2553 frm = ieee80211_add_powerconstraint(frm, vap); 2554 bo->bo_csa = frm; 2555 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2556 frm = ieee80211_add_csa(frm, vap); 2557 } else 2558 bo->bo_csa = frm; 2559 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2560 bo->bo_erp = frm; 2561 frm = ieee80211_add_erp(frm, ic); 2562 } 2563 frm = ieee80211_add_xrates(frm, rs); 2564 if (vap->iv_flags & IEEE80211_F_WPA2) { 2565 if (vap->iv_rsn_ie != NULL) 2566 frm = add_ie(frm, vap->iv_rsn_ie); 2567 /* XXX else complain */ 2568 } 2569 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2570 frm = ieee80211_add_htcap(frm, ni); 2571 bo->bo_htinfo = frm; 2572 frm = ieee80211_add_htinfo(frm, ni); 2573 } 2574 if (vap->iv_flags & IEEE80211_F_WPA1) { 2575 if (vap->iv_wpa_ie != NULL) 2576 frm = add_ie(frm, vap->iv_wpa_ie); 2577 /* XXX else complain */ 2578 } 2579 if (vap->iv_flags & IEEE80211_F_WME) { 2580 bo->bo_wme = frm; 2581 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2582 } 2583 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2584 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2585 frm = ieee80211_add_htcap_vendor(frm, ni); 2586 frm = ieee80211_add_htinfo_vendor(frm, ni); 2587 } 2588 if (vap->iv_appie_beacon != NULL) { 2589 bo->bo_appie = frm; 2590 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2591 frm = add_appie(frm, vap->iv_appie_beacon); 2592 } 2593 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2594 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2595 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2596} 2597 2598/* 2599 * Allocate a beacon frame and fillin the appropriate bits. 2600 */ 2601struct mbuf * 2602ieee80211_beacon_alloc(struct ieee80211_node *ni, 2603 struct ieee80211_beacon_offsets *bo) 2604{ 2605 struct ieee80211vap *vap = ni->ni_vap; 2606 struct ieee80211com *ic = ni->ni_ic; 2607 struct ifnet *ifp = vap->iv_ifp; 2608 struct ieee80211_frame *wh; 2609 struct mbuf *m; 2610 int pktlen; 2611 uint8_t *frm; 2612 2613 /* 2614 * beacon frame format 2615 * [8] time stamp 2616 * [2] beacon interval 2617 * [2] cabability information 2618 * [tlv] ssid 2619 * [tlv] supported rates 2620 * [3] parameter set (DS) 2621 * [8] CF parameter set (optional) 2622 * [tlv] parameter set (IBSS/TIM) 2623 * [tlv] country (optional) 2624 * [3] power control (optional) 2625 * [5] channel switch announcement (CSA) (optional) 2626 * [tlv] extended rate phy (ERP) 2627 * [tlv] extended supported rates 2628 * [tlv] RSN parameters 2629 * [tlv] HT capabilities 2630 * [tlv] HT information 2631 * [tlv] Vendor OUI HT capabilities (optional) 2632 * [tlv] Vendor OUI HT information (optional) 2633 * XXX Vendor-specific OIDs (e.g. Atheros) 2634 * [tlv] WPA parameters 2635 * [tlv] WME parameters 2636 * [tlv] application data (optional) 2637 * NB: we allocate the max space required for the TIM bitmap. 2638 * XXX how big is this? 2639 */ 2640 pktlen = 8 /* time stamp */ 2641 + sizeof(uint16_t) /* beacon interval */ 2642 + sizeof(uint16_t) /* capabilities */ 2643 + 2 + ni->ni_esslen /* ssid */ 2644 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2645 + 2 + 1 /* DS parameters */ 2646 + 2 + 6 /* CF parameters */ 2647 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2648 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2649 + 2 + 1 /* power control */ 2650 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2651 + 2 + 1 /* ERP */ 2652 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2653 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2654 2*sizeof(struct ieee80211_ie_wpa) : 0) 2655 /* XXX conditional? */ 2656 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2657 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2658 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2659 sizeof(struct ieee80211_wme_param) : 0) 2660 + IEEE80211_MAX_APPIE 2661 ; 2662 m = ieee80211_getmgtframe(&frm, 2663 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2664 if (m == NULL) { 2665 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2666 "%s: cannot get buf; size %u\n", __func__, pktlen); 2667 vap->iv_stats.is_tx_nobuf++; 2668 return NULL; 2669 } 2670 ieee80211_beacon_construct(m, frm, bo, ni); 2671 2672 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2673 KASSERT(m != NULL, ("no space for 802.11 header?")); 2674 wh = mtod(m, struct ieee80211_frame *); 2675 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2676 IEEE80211_FC0_SUBTYPE_BEACON; 2677 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2678 *(uint16_t *)wh->i_dur = 0; 2679 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2680 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2681 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2682 *(uint16_t *)wh->i_seq = 0; 2683 2684 return m; 2685} 2686 2687/* 2688 * Update the dynamic parts of a beacon frame based on the current state. 2689 */ 2690int 2691ieee80211_beacon_update(struct ieee80211_node *ni, 2692 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2693{ 2694 struct ieee80211vap *vap = ni->ni_vap; 2695 struct ieee80211com *ic = ni->ni_ic; 2696 int len_changed = 0; 2697 uint16_t capinfo; 2698 2699 IEEE80211_LOCK(ic); 2700 /* 2701 * Handle 11h channel change when we've reached the count. 2702 * We must recalculate the beacon frame contents to account 2703 * for the new channel. Note we do this only for the first 2704 * vap that reaches this point; subsequent vaps just update 2705 * their beacon state to reflect the recalculated channel. 2706 */ 2707 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2708 vap->iv_csa_count == ic->ic_csa_count) { 2709 vap->iv_csa_count = 0; 2710 /* 2711 * Effect channel change before reconstructing the beacon 2712 * frame contents as many places reference ni_chan. 2713 */ 2714 if (ic->ic_csa_newchan != NULL) 2715 ieee80211_csa_completeswitch(ic); 2716 /* 2717 * NB: ieee80211_beacon_construct clears all pending 2718 * updates in bo_flags so we don't need to explicitly 2719 * clear IEEE80211_BEACON_CSA. 2720 */ 2721 ieee80211_beacon_construct(m, 2722 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2723 2724 /* XXX do WME aggressive mode processing? */ 2725 IEEE80211_UNLOCK(ic); 2726 return 1; /* just assume length changed */ 2727 } 2728 2729 /* XXX faster to recalculate entirely or just changes? */ 2730 capinfo = getcapinfo(vap, ni->ni_chan); 2731 *bo->bo_caps = htole16(capinfo); 2732 2733 if (vap->iv_flags & IEEE80211_F_WME) { 2734 struct ieee80211_wme_state *wme = &ic->ic_wme; 2735 2736 /* 2737 * Check for agressive mode change. When there is 2738 * significant high priority traffic in the BSS 2739 * throttle back BE traffic by using conservative 2740 * parameters. Otherwise BE uses agressive params 2741 * to optimize performance of legacy/non-QoS traffic. 2742 */ 2743 if (wme->wme_flags & WME_F_AGGRMODE) { 2744 if (wme->wme_hipri_traffic > 2745 wme->wme_hipri_switch_thresh) { 2746 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2747 "%s: traffic %u, disable aggressive mode\n", 2748 __func__, wme->wme_hipri_traffic); 2749 wme->wme_flags &= ~WME_F_AGGRMODE; 2750 ieee80211_wme_updateparams_locked(vap); 2751 wme->wme_hipri_traffic = 2752 wme->wme_hipri_switch_hysteresis; 2753 } else 2754 wme->wme_hipri_traffic = 0; 2755 } else { 2756 if (wme->wme_hipri_traffic <= 2757 wme->wme_hipri_switch_thresh) { 2758 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2759 "%s: traffic %u, enable aggressive mode\n", 2760 __func__, wme->wme_hipri_traffic); 2761 wme->wme_flags |= WME_F_AGGRMODE; 2762 ieee80211_wme_updateparams_locked(vap); 2763 wme->wme_hipri_traffic = 0; 2764 } else 2765 wme->wme_hipri_traffic = 2766 wme->wme_hipri_switch_hysteresis; 2767 } 2768 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2769 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2770 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2771 } 2772 } 2773 2774 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2775 ieee80211_ht_update_beacon(vap, bo); 2776 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2777 } 2778 2779 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2780 struct ieee80211_tim_ie *tie = 2781 (struct ieee80211_tim_ie *) bo->bo_tim; 2782 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2783 u_int timlen, timoff, i; 2784 /* 2785 * ATIM/DTIM needs updating. If it fits in the 2786 * current space allocated then just copy in the 2787 * new bits. Otherwise we need to move any trailing 2788 * data to make room. Note that we know there is 2789 * contiguous space because ieee80211_beacon_allocate 2790 * insures there is space in the mbuf to write a 2791 * maximal-size virtual bitmap (based on iv_max_aid). 2792 */ 2793 /* 2794 * Calculate the bitmap size and offset, copy any 2795 * trailer out of the way, and then copy in the 2796 * new bitmap and update the information element. 2797 * Note that the tim bitmap must contain at least 2798 * one byte and any offset must be even. 2799 */ 2800 if (vap->iv_ps_pending != 0) { 2801 timoff = 128; /* impossibly large */ 2802 for (i = 0; i < vap->iv_tim_len; i++) 2803 if (vap->iv_tim_bitmap[i]) { 2804 timoff = i &~ 1; 2805 break; 2806 } 2807 KASSERT(timoff != 128, ("tim bitmap empty!")); 2808 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2809 if (vap->iv_tim_bitmap[i]) 2810 break; 2811 timlen = 1 + (i - timoff); 2812 } else { 2813 timoff = 0; 2814 timlen = 1; 2815 } 2816 if (timlen != bo->bo_tim_len) { 2817 /* copy up/down trailer */ 2818 int adjust = tie->tim_bitmap+timlen 2819 - bo->bo_tim_trailer; 2820 ovbcopy(bo->bo_tim_trailer, 2821 bo->bo_tim_trailer+adjust, 2822 bo->bo_tim_trailer_len); 2823 bo->bo_tim_trailer += adjust; 2824 bo->bo_erp += adjust; 2825 bo->bo_htinfo += adjust; 2826 bo->bo_appie += adjust; 2827 bo->bo_wme += adjust; 2828 bo->bo_csa += adjust; 2829 bo->bo_tim_len = timlen; 2830 2831 /* update information element */ 2832 tie->tim_len = 3 + timlen; 2833 tie->tim_bitctl = timoff; 2834 len_changed = 1; 2835 } 2836 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2837 bo->bo_tim_len); 2838 2839 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2840 2841 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2842 "%s: TIM updated, pending %u, off %u, len %u\n", 2843 __func__, vap->iv_ps_pending, timoff, timlen); 2844 } 2845 /* count down DTIM period */ 2846 if (tie->tim_count == 0) 2847 tie->tim_count = tie->tim_period - 1; 2848 else 2849 tie->tim_count--; 2850 /* update state for buffered multicast frames on DTIM */ 2851 if (mcast && tie->tim_count == 0) 2852 tie->tim_bitctl |= 1; 2853 else 2854 tie->tim_bitctl &= ~1; 2855 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2856 struct ieee80211_csa_ie *csa = 2857 (struct ieee80211_csa_ie *) bo->bo_csa; 2858 2859 /* 2860 * Insert or update CSA ie. If we're just starting 2861 * to count down to the channel switch then we need 2862 * to insert the CSA ie. Otherwise we just need to 2863 * drop the count. The actual change happens above 2864 * when the vap's count reaches the target count. 2865 */ 2866 if (vap->iv_csa_count == 0) { 2867 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2868 bo->bo_erp += sizeof(*csa); 2869 bo->bo_wme += sizeof(*csa); 2870 bo->bo_appie += sizeof(*csa); 2871 bo->bo_csa_trailer_len += sizeof(*csa); 2872 bo->bo_tim_trailer_len += sizeof(*csa); 2873 m->m_len += sizeof(*csa); 2874 m->m_pkthdr.len += sizeof(*csa); 2875 2876 ieee80211_add_csa(bo->bo_csa, vap); 2877 } else 2878 csa->csa_count--; 2879 vap->iv_csa_count++; 2880 /* NB: don't clear IEEE80211_BEACON_CSA */ 2881 } 2882 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2883 /* 2884 * ERP element needs updating. 2885 */ 2886 (void) ieee80211_add_erp(bo->bo_erp, ic); 2887 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2888 } 2889 } 2890 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2891 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2892 int aielen; 2893 uint8_t *frm; 2894 2895 aielen = 0; 2896 if (aie != NULL) 2897 aielen += aie->ie_len; 2898 if (aielen != bo->bo_appie_len) { 2899 /* copy up/down trailer */ 2900 int adjust = aielen - bo->bo_appie_len; 2901 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2902 bo->bo_tim_trailer_len); 2903 bo->bo_tim_trailer += adjust; 2904 bo->bo_appie += adjust; 2905 bo->bo_appie_len = aielen; 2906 2907 len_changed = 1; 2908 } 2909 frm = bo->bo_appie; 2910 if (aie != NULL) 2911 frm = add_appie(frm, aie); 2912 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2913 } 2914 IEEE80211_UNLOCK(ic); 2915 2916 return len_changed; 2917} 2918