ieee80211_output.c revision 190094
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 190094 2009-03-19 18:45:37Z rpaulo $"); 29 30#include "opt_inet.h" 31#include "opt_wlan.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/mbuf.h> 36#include <sys/kernel.h> 37#include <sys/endian.h> 38 39#include <sys/socket.h> 40 41#include <net/bpf.h> 42#include <net/ethernet.h> 43#include <net/if.h> 44#include <net/if_llc.h> 45#include <net/if_media.h> 46#include <net/if_vlan_var.h> 47 48#include <net80211/ieee80211_var.h> 49#include <net80211/ieee80211_regdomain.h> 50#ifdef IEEE80211_SUPPORT_TDMA 51#include <net80211/ieee80211_tdma.h> 52#endif 53#include <net80211/ieee80211_wds.h> 54 55#ifdef INET 56#include <netinet/in.h> 57#include <netinet/if_ether.h> 58#include <netinet/in_systm.h> 59#include <netinet/ip.h> 60#endif 61 62#define ETHER_HEADER_COPY(dst, src) \ 63 memcpy(dst, src, sizeof(struct ether_header)) 64 65static struct mbuf *ieee80211_encap_fastframe(struct ieee80211vap *, 66 struct mbuf *m1, const struct ether_header *eh1, 67 struct mbuf *m2, const struct ether_header *eh2); 68static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 69 u_int hdrsize, u_int ciphdrsize, u_int mtu); 70static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 71 72#ifdef IEEE80211_DEBUG 73/* 74 * Decide if an outbound management frame should be 75 * printed when debugging is enabled. This filters some 76 * of the less interesting frames that come frequently 77 * (e.g. beacons). 78 */ 79static __inline int 80doprint(struct ieee80211vap *vap, int subtype) 81{ 82 switch (subtype) { 83 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 84 return (vap->iv_opmode == IEEE80211_M_IBSS); 85 } 86 return 1; 87} 88#endif 89 90/* 91 * Start method for vap's. All packets from the stack come 92 * through here. We handle common processing of the packets 93 * before dispatching them to the underlying device. 94 */ 95void 96ieee80211_start(struct ifnet *ifp) 97{ 98#define IS_DWDS(vap) \ 99 (vap->iv_opmode == IEEE80211_M_WDS && \ 100 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 101 struct ieee80211vap *vap = ifp->if_softc; 102 struct ieee80211com *ic = vap->iv_ic; 103 struct ifnet *parent = ic->ic_ifp; 104 struct ieee80211_node *ni; 105 struct mbuf *m; 106 struct ether_header *eh; 107 int error; 108 109 /* NB: parent must be up and running */ 110 if (!IFNET_IS_UP_RUNNING(parent)) { 111 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 112 "%s: ignore queue, parent %s not up+running\n", 113 __func__, parent->if_xname); 114 /* XXX stat */ 115 return; 116 } 117 if (vap->iv_state == IEEE80211_S_SLEEP) { 118 /* 119 * In power save, wakeup device for transmit. 120 */ 121 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 122 return; 123 } 124 /* 125 * No data frames go out unless we're running. 126 * Note in particular this covers CAC and CSA 127 * states (though maybe we should check muting 128 * for CSA). 129 */ 130 if (vap->iv_state != IEEE80211_S_RUN) { 131 IEEE80211_LOCK(ic); 132 /* re-check under the com lock to avoid races */ 133 if (vap->iv_state != IEEE80211_S_RUN) { 134 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 135 "%s: ignore queue, in %s state\n", 136 __func__, ieee80211_state_name[vap->iv_state]); 137 vap->iv_stats.is_tx_badstate++; 138 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 139 IEEE80211_UNLOCK(ic); 140 return; 141 } 142 IEEE80211_UNLOCK(ic); 143 } 144 for (;;) { 145 IFQ_DEQUEUE(&ifp->if_snd, m); 146 if (m == NULL) 147 break; 148 /* 149 * Sanitize mbuf flags for net80211 use. We cannot 150 * clear M_PWR_SAV because this may be set for frames 151 * that are re-submitted from the power save queue. 152 * 153 * NB: This must be done before ieee80211_classify as 154 * it marks EAPOL in frames with M_EAPOL. 155 */ 156 m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 157 /* 158 * Cancel any background scan. 159 */ 160 if (ic->ic_flags & IEEE80211_F_SCAN) 161 ieee80211_cancel_anyscan(vap); 162 /* 163 * Find the node for the destination so we can do 164 * things like power save and fast frames aggregation. 165 * 166 * NB: past this point various code assumes the first 167 * mbuf has the 802.3 header present (and contiguous). 168 */ 169 ni = NULL; 170 if (m->m_len < sizeof(struct ether_header) && 171 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 172 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 173 "discard frame, %s\n", "m_pullup failed"); 174 vap->iv_stats.is_tx_nobuf++; /* XXX */ 175 ifp->if_oerrors++; 176 continue; 177 } 178 eh = mtod(m, struct ether_header *); 179 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 180 if (IS_DWDS(vap)) { 181 /* 182 * Only unicast frames from the above go out 183 * DWDS vaps; multicast frames are handled by 184 * dispatching the frame as it comes through 185 * the AP vap (see below). 186 */ 187 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 188 eh->ether_dhost, "mcast", "%s", "on DWDS"); 189 vap->iv_stats.is_dwds_mcast++; 190 m_freem(m); 191 continue; 192 } 193 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 194 /* 195 * Spam DWDS vap's w/ multicast traffic. 196 */ 197 /* XXX only if dwds in use? */ 198 ieee80211_dwds_mcast(vap, m); 199 } 200 } 201 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 202 if (ni == NULL) { 203 /* NB: ieee80211_find_txnode does stat+msg */ 204 ifp->if_oerrors++; 205 m_freem(m); 206 continue; 207 } 208 if (ni->ni_associd == 0 && 209 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 211 eh->ether_dhost, NULL, 212 "sta not associated (type 0x%04x)", 213 htons(eh->ether_type)); 214 vap->iv_stats.is_tx_notassoc++; 215 ifp->if_oerrors++; 216 m_freem(m); 217 ieee80211_free_node(ni); 218 continue; 219 } 220 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 (void) 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 error = parent->if_transmit(parent, m); 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 m->m_flags |= M_ENCAP; /* mark encapsulated */ 511 512 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 513 M_WME_SETAC(m, params->ibp_pri); 514 515#ifdef IEEE80211_DEBUG 516 /* avoid printing too many frames */ 517 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 518 ieee80211_msg_dumppkts(vap)) { 519 printf("[%s] send %s on channel %u\n", 520 ether_sprintf(wh->i_addr1), 521 ieee80211_mgt_subtype_name[ 522 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 523 IEEE80211_FC0_SUBTYPE_SHIFT], 524 ieee80211_chan2ieee(ic, ic->ic_curchan)); 525 } 526#endif 527 IEEE80211_NODE_STAT(ni, tx_mgmt); 528 529 return ic->ic_raw_xmit(ni, m, params); 530} 531 532/* 533 * Send a null data frame to the specified node. If the station 534 * is setup for QoS then a QoS Null Data frame is constructed. 535 * If this is a WDS station then a 4-address frame is constructed. 536 * 537 * NB: the caller is assumed to have setup a node reference 538 * for use; this is necessary to deal with a race condition 539 * when probing for inactive stations. Like ieee80211_mgmt_output 540 * we must cleanup any node reference on error; however we 541 * can safely just unref it as we know it will never be the 542 * last reference to the node. 543 */ 544int 545ieee80211_send_nulldata(struct ieee80211_node *ni) 546{ 547 struct ieee80211vap *vap = ni->ni_vap; 548 struct ieee80211com *ic = ni->ni_ic; 549 struct mbuf *m; 550 struct ieee80211_frame *wh; 551 int hdrlen; 552 uint8_t *frm; 553 554 if (vap->iv_state == IEEE80211_S_CAC) { 555 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 556 ni, "block %s frame in CAC state", "null data"); 557 ieee80211_unref_node(&ni); 558 vap->iv_stats.is_tx_badstate++; 559 return EIO; /* XXX */ 560 } 561 562 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 563 hdrlen = sizeof(struct ieee80211_qosframe); 564 else 565 hdrlen = sizeof(struct ieee80211_frame); 566 /* NB: only WDS vap's get 4-address frames */ 567 if (vap->iv_opmode == IEEE80211_M_WDS) 568 hdrlen += IEEE80211_ADDR_LEN; 569 if (ic->ic_flags & IEEE80211_F_DATAPAD) 570 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 571 572 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 573 if (m == NULL) { 574 /* XXX debug msg */ 575 ieee80211_unref_node(&ni); 576 vap->iv_stats.is_tx_nobuf++; 577 return ENOMEM; 578 } 579 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 580 ("leading space %zd", M_LEADINGSPACE(m))); 581 M_PREPEND(m, hdrlen, M_DONTWAIT); 582 if (m == NULL) { 583 /* NB: cannot happen */ 584 ieee80211_free_node(ni); 585 return ENOMEM; 586 } 587 588 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 589 if (ni->ni_flags & IEEE80211_NODE_QOS) { 590 const int tid = WME_AC_TO_TID(WME_AC_BE); 591 uint8_t *qos; 592 593 ieee80211_send_setup(ni, wh, 594 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 595 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 596 597 if (vap->iv_opmode == IEEE80211_M_WDS) 598 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 599 else 600 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 601 qos[0] = tid & IEEE80211_QOS_TID; 602 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 603 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 604 qos[1] = 0; 605 } else { 606 ieee80211_send_setup(ni, wh, 607 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 608 IEEE80211_NONQOS_TID, 609 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 610 } 611 if (vap->iv_opmode != IEEE80211_M_WDS) { 612 /* NB: power management bit is never sent by an AP */ 613 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 614 vap->iv_opmode != IEEE80211_M_HOSTAP) 615 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 616 } 617 m->m_len = m->m_pkthdr.len = hdrlen; 618 m->m_flags |= M_ENCAP; /* mark encapsulated */ 619 620 M_WME_SETAC(m, WME_AC_BE); 621 622 IEEE80211_NODE_STAT(ni, tx_data); 623 624 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 625 "send %snull data frame on channel %u, pwr mgt %s", 626 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 627 ieee80211_chan2ieee(ic, ic->ic_curchan), 628 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 629 630 return ic->ic_raw_xmit(ni, m, NULL); 631} 632 633/* 634 * Assign priority to a frame based on any vlan tag assigned 635 * to the station and/or any Diffserv setting in an IP header. 636 * Finally, if an ACM policy is setup (in station mode) it's 637 * applied. 638 */ 639int 640ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 641{ 642 const struct ether_header *eh = mtod(m, struct ether_header *); 643 int v_wme_ac, d_wme_ac, ac; 644 645 /* 646 * Always promote PAE/EAPOL frames to high priority. 647 */ 648 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 649 /* NB: mark so others don't need to check header */ 650 m->m_flags |= M_EAPOL; 651 ac = WME_AC_VO; 652 goto done; 653 } 654 /* 655 * Non-qos traffic goes to BE. 656 */ 657 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 658 ac = WME_AC_BE; 659 goto done; 660 } 661 662 /* 663 * If node has a vlan tag then all traffic 664 * to it must have a matching tag. 665 */ 666 v_wme_ac = 0; 667 if (ni->ni_vlan != 0) { 668 if ((m->m_flags & M_VLANTAG) == 0) { 669 IEEE80211_NODE_STAT(ni, tx_novlantag); 670 return 1; 671 } 672 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 673 EVL_VLANOFTAG(ni->ni_vlan)) { 674 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 675 return 1; 676 } 677 /* map vlan priority to AC */ 678 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 679 } 680 681#ifdef INET 682 if (eh->ether_type == htons(ETHERTYPE_IP)) { 683 uint8_t tos; 684 /* 685 * IP frame, map the DSCP bits from the TOS field. 686 */ 687 /* XXX m_copydata may be too slow for fast path */ 688 /* NB: ip header may not be in first mbuf */ 689 m_copydata(m, sizeof(struct ether_header) + 690 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 691 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 692 d_wme_ac = TID_TO_WME_AC(tos); 693 } else { 694#endif /* INET */ 695 d_wme_ac = WME_AC_BE; 696#ifdef INET 697 } 698#endif 699 /* 700 * Use highest priority AC. 701 */ 702 if (v_wme_ac > d_wme_ac) 703 ac = v_wme_ac; 704 else 705 ac = d_wme_ac; 706 707 /* 708 * Apply ACM policy. 709 */ 710 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 711 static const int acmap[4] = { 712 WME_AC_BK, /* WME_AC_BE */ 713 WME_AC_BK, /* WME_AC_BK */ 714 WME_AC_BE, /* WME_AC_VI */ 715 WME_AC_VI, /* WME_AC_VO */ 716 }; 717 struct ieee80211com *ic = ni->ni_ic; 718 719 while (ac != WME_AC_BK && 720 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 721 ac = acmap[ac]; 722 } 723done: 724 M_WME_SETAC(m, ac); 725 return 0; 726} 727 728/* 729 * Insure there is sufficient contiguous space to encapsulate the 730 * 802.11 data frame. If room isn't already there, arrange for it. 731 * Drivers and cipher modules assume we have done the necessary work 732 * and fail rudely if they don't find the space they need. 733 */ 734static struct mbuf * 735ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 736 struct ieee80211_key *key, struct mbuf *m) 737{ 738#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 739 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 740 741 if (key != NULL) { 742 /* XXX belongs in crypto code? */ 743 needed_space += key->wk_cipher->ic_header; 744 /* XXX frags */ 745 /* 746 * When crypto is being done in the host we must insure 747 * the data are writable for the cipher routines; clone 748 * a writable mbuf chain. 749 * XXX handle SWMIC specially 750 */ 751 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 752 m = m_unshare(m, M_NOWAIT); 753 if (m == NULL) { 754 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 755 "%s: cannot get writable mbuf\n", __func__); 756 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 757 return NULL; 758 } 759 } 760 } 761 /* 762 * We know we are called just before stripping an Ethernet 763 * header and prepending an LLC header. This means we know 764 * there will be 765 * sizeof(struct ether_header) - sizeof(struct llc) 766 * bytes recovered to which we need additional space for the 767 * 802.11 header and any crypto header. 768 */ 769 /* XXX check trailing space and copy instead? */ 770 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 771 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 772 if (n == NULL) { 773 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 774 "%s: cannot expand storage\n", __func__); 775 vap->iv_stats.is_tx_nobuf++; 776 m_freem(m); 777 return NULL; 778 } 779 KASSERT(needed_space <= MHLEN, 780 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 781 /* 782 * Setup new mbuf to have leading space to prepend the 783 * 802.11 header and any crypto header bits that are 784 * required (the latter are added when the driver calls 785 * back to ieee80211_crypto_encap to do crypto encapsulation). 786 */ 787 /* NB: must be first 'cuz it clobbers m_data */ 788 m_move_pkthdr(n, m); 789 n->m_len = 0; /* NB: m_gethdr does not set */ 790 n->m_data += needed_space; 791 /* 792 * Pull up Ethernet header to create the expected layout. 793 * We could use m_pullup but that's overkill (i.e. we don't 794 * need the actual data) and it cannot fail so do it inline 795 * for speed. 796 */ 797 /* NB: struct ether_header is known to be contiguous */ 798 n->m_len += sizeof(struct ether_header); 799 m->m_len -= sizeof(struct ether_header); 800 m->m_data += sizeof(struct ether_header); 801 /* 802 * Replace the head of the chain. 803 */ 804 n->m_next = m; 805 m = n; 806 } 807 return m; 808#undef TO_BE_RECLAIMED 809} 810 811/* 812 * Return the transmit key to use in sending a unicast frame. 813 * If a unicast key is set we use that. When no unicast key is set 814 * we fall back to the default transmit key. 815 */ 816static __inline struct ieee80211_key * 817ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 818 struct ieee80211_node *ni) 819{ 820 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 821 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 822 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 823 return NULL; 824 return &vap->iv_nw_keys[vap->iv_def_txkey]; 825 } else { 826 return &ni->ni_ucastkey; 827 } 828} 829 830/* 831 * Return the transmit key to use in sending a multicast frame. 832 * Multicast traffic always uses the group key which is installed as 833 * the default tx key. 834 */ 835static __inline struct ieee80211_key * 836ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 837 struct ieee80211_node *ni) 838{ 839 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 840 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 841 return NULL; 842 return &vap->iv_nw_keys[vap->iv_def_txkey]; 843} 844 845/* 846 * Encapsulate an outbound data frame. The mbuf chain is updated. 847 * If an error is encountered NULL is returned. The caller is required 848 * to provide a node reference and pullup the ethernet header in the 849 * first mbuf. 850 * 851 * NB: Packet is assumed to be processed by ieee80211_classify which 852 * marked EAPOL frames w/ M_EAPOL. 853 */ 854struct mbuf * 855ieee80211_encap(struct ieee80211_node *ni, struct mbuf *m) 856{ 857#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 858 struct ieee80211vap *vap = ni->ni_vap; 859 struct ieee80211com *ic = ni->ni_ic; 860 struct ether_header eh; 861 struct ieee80211_frame *wh; 862 struct ieee80211_key *key; 863 struct llc *llc; 864 int hdrsize, hdrspace, datalen, addqos, txfrag, isff, is4addr; 865 866 /* 867 * Copy existing Ethernet header to a safe place. The 868 * rest of the code assumes it's ok to strip it when 869 * reorganizing state for the final encapsulation. 870 */ 871 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 872 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 873 874 /* 875 * Insure space for additional headers. First identify 876 * transmit key to use in calculating any buffer adjustments 877 * required. This is also used below to do privacy 878 * encapsulation work. Then calculate the 802.11 header 879 * size and any padding required by the driver. 880 * 881 * Note key may be NULL if we fall back to the default 882 * transmit key and that is not set. In that case the 883 * buffer may not be expanded as needed by the cipher 884 * routines, but they will/should discard it. 885 */ 886 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 887 if (vap->iv_opmode == IEEE80211_M_STA || 888 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 889 (vap->iv_opmode == IEEE80211_M_WDS && 890 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 891 key = ieee80211_crypto_getucastkey(vap, ni); 892 else 893 key = ieee80211_crypto_getmcastkey(vap, ni); 894 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 895 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 896 eh.ether_dhost, 897 "no default transmit key (%s) deftxkey %u", 898 __func__, vap->iv_def_txkey); 899 vap->iv_stats.is_tx_nodefkey++; 900 goto bad; 901 } 902 } else 903 key = NULL; 904 /* 905 * XXX Some ap's don't handle QoS-encapsulated EAPOL 906 * frames so suppress use. This may be an issue if other 907 * ap's require all data frames to be QoS-encapsulated 908 * once negotiated in which case we'll need to make this 909 * configurable. 910 */ 911 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 912 (m->m_flags & M_EAPOL) == 0; 913 if (addqos) 914 hdrsize = sizeof(struct ieee80211_qosframe); 915 else 916 hdrsize = sizeof(struct ieee80211_frame); 917 /* 918 * 4-address frames need to be generated for: 919 * o packets sent through a WDS vap (M_WDS || IEEE80211_M_WDS) 920 * o packets relayed by a station operating with dynamic WDS 921 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 922 */ 923 is4addr = (m->m_flags & M_WDS) || 924 vap->iv_opmode == IEEE80211_M_WDS || /* XXX redundant? */ 925 (vap->iv_opmode == IEEE80211_M_STA && 926 (vap->iv_flags & IEEE80211_F_DWDS) && 927 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 928 if (is4addr) 929 hdrsize += IEEE80211_ADDR_LEN; 930 /* 931 * Honor driver DATAPAD requirement. 932 */ 933 if (ic->ic_flags & IEEE80211_F_DATAPAD) 934 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 935 else 936 hdrspace = hdrsize; 937 938 if ((isff = m->m_flags & M_FF) != 0) { 939 struct mbuf *m2; 940 struct ether_header eh2; 941 942 /* 943 * Fast frame encapsulation. There must be two packets 944 * chained with m_nextpkt. We do header adjustment for 945 * each, add the tunnel encapsulation, and then concatenate 946 * the mbuf chains to form a single frame for transmission. 947 */ 948 m2 = m->m_nextpkt; 949 if (m2 == NULL) { 950 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 951 "%s: only one frame\n", __func__); 952 goto bad; 953 } 954 m->m_nextpkt = NULL; 955 /* 956 * Include fast frame headers in adjusting header 957 * layout; this allocates space according to what 958 * ieee80211_encap_fastframe will do. 959 */ 960 m = ieee80211_mbuf_adjust(vap, 961 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 962 sizeof(struct ether_header), 963 key, m); 964 if (m == NULL) { 965 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 966 m_freem(m2); 967 goto bad; 968 } 969 /* 970 * Copy second frame's Ethernet header out of line 971 * and adjust for encapsulation headers. Note that 972 * we make room for padding in case there isn't room 973 * at the end of first frame. 974 */ 975 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 976 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 977 m2 = ieee80211_mbuf_adjust(vap, 978 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 979 NULL, m2); 980 if (m2 == NULL) { 981 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 982 goto bad; 983 } 984 m = ieee80211_encap_fastframe(vap, m, &eh, m2, &eh2); 985 if (m == NULL) 986 goto bad; 987 } else { 988 /* 989 * Normal frame. 990 */ 991 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 992 if (m == NULL) { 993 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 994 goto bad; 995 } 996 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 997 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 998 llc = mtod(m, struct llc *); 999 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1000 llc->llc_control = LLC_UI; 1001 llc->llc_snap.org_code[0] = 0; 1002 llc->llc_snap.org_code[1] = 0; 1003 llc->llc_snap.org_code[2] = 0; 1004 llc->llc_snap.ether_type = eh.ether_type; 1005 } 1006 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1007 1008 M_PREPEND(m, hdrspace, M_DONTWAIT); 1009 if (m == NULL) { 1010 vap->iv_stats.is_tx_nobuf++; 1011 goto bad; 1012 } 1013 wh = mtod(m, struct ieee80211_frame *); 1014 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1015 *(uint16_t *)wh->i_dur = 0; 1016 if (is4addr) { 1017 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1018 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1019 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1020 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1021 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1022 } else switch (vap->iv_opmode) { 1023 case IEEE80211_M_STA: 1024 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1025 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1026 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1027 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1028 break; 1029 case IEEE80211_M_IBSS: 1030 case IEEE80211_M_AHDEMO: 1031 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1032 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1033 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1034 /* 1035 * NB: always use the bssid from iv_bss as the 1036 * neighbor's may be stale after an ibss merge 1037 */ 1038 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1039 break; 1040 case IEEE80211_M_HOSTAP: 1041 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1042 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1043 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1044 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1045 break; 1046 case IEEE80211_M_MONITOR: 1047 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1048 goto bad; 1049 } 1050 if (m->m_flags & M_MORE_DATA) 1051 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1052 if (addqos) { 1053 uint8_t *qos; 1054 int ac, tid; 1055 1056 if (is4addr) { 1057 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1058 } else 1059 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1060 ac = M_WME_GETAC(m); 1061 /* map from access class/queue to 11e header priorty value */ 1062 tid = WME_AC_TO_TID(ac); 1063 qos[0] = tid & IEEE80211_QOS_TID; 1064 /* 1065 * Check if A-MPDU tx aggregation is setup or if we 1066 * should try to enable it. The sta must be associated 1067 * with HT and A-MPDU enabled for use. When the policy 1068 * routine decides we should enable A-MPDU we issue an 1069 * ADDBA request and wait for a reply. The frame being 1070 * encapsulated will go out w/o using A-MPDU, or possibly 1071 * it might be collected by the driver and held/retransmit. 1072 * The default ic_ampdu_enable routine handles staggering 1073 * ADDBA requests in case the receiver NAK's us or we are 1074 * otherwise unable to establish a BA stream. 1075 */ 1076 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1077 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1078 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1079 1080 ieee80211_txampdu_count_packet(tap); 1081 if (IEEE80211_AMPDU_RUNNING(tap)) { 1082 /* 1083 * Operational, mark frame for aggregation. 1084 * 1085 * NB: We support only immediate BA's for 1086 * AMPDU which means we set the QoS control 1087 * field to "normal ack" (0) to get "implicit 1088 * block ack" behaviour. 1089 */ 1090 m->m_flags |= M_AMPDU_MPDU; 1091 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1092 ic->ic_ampdu_enable(ni, tap)) { 1093 /* 1094 * Not negotiated yet, request service. 1095 */ 1096 ieee80211_ampdu_request(ni, tap); 1097 } 1098 } 1099 /* XXX works even when BA marked above */ 1100 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1101 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1102 qos[1] = 0; 1103 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1104 1105 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1106 /* 1107 * NB: don't assign a sequence # to potential 1108 * aggregates; we expect this happens at the 1109 * point the frame comes off any aggregation q 1110 * as otherwise we may introduce holes in the 1111 * BA sequence space and/or make window accouting 1112 * more difficult. 1113 * 1114 * XXX may want to control this with a driver 1115 * capability; this may also change when we pull 1116 * aggregation up into net80211 1117 */ 1118 *(uint16_t *)wh->i_seq = 1119 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1120 ni->ni_txseqs[tid]++; 1121 } 1122 } else { 1123 *(uint16_t *)wh->i_seq = 1124 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1125 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1126 } 1127 /* check if xmit fragmentation is required */ 1128 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1129 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1130 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1131 !isff); /* NB: don't fragment ff's */ 1132 if (key != NULL) { 1133 /* 1134 * IEEE 802.1X: send EAPOL frames always in the clear. 1135 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1136 */ 1137 if ((m->m_flags & M_EAPOL) == 0 || 1138 ((vap->iv_flags & IEEE80211_F_WPA) && 1139 (vap->iv_opmode == IEEE80211_M_STA ? 1140 !IEEE80211_KEY_UNDEFINED(key) : 1141 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1142 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1143 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1144 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1145 eh.ether_dhost, 1146 "%s", "enmic failed, discard frame"); 1147 vap->iv_stats.is_crypto_enmicfail++; 1148 goto bad; 1149 } 1150 } 1151 } 1152 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1153 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1154 goto bad; 1155 1156 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1157 1158 IEEE80211_NODE_STAT(ni, tx_data); 1159 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1160 IEEE80211_NODE_STAT(ni, tx_mcast); 1161 else 1162 IEEE80211_NODE_STAT(ni, tx_ucast); 1163 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1164 1165 /* XXX fragmented frames not handled */ 1166 if (bpf_peers_present(vap->iv_rawbpf)) 1167 bpf_mtap(vap->iv_rawbpf, m); 1168 1169 return m; 1170bad: 1171 if (m != NULL) 1172 m_freem(m); 1173 return NULL; 1174#undef WH4 1175} 1176 1177/* 1178 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1179 * tunnel encapsulation. The frame is assumed to have an Ethernet 1180 * header at the front that must be stripped before prepending the 1181 * LLC followed by the Ethernet header passed in (with an Ethernet 1182 * type that specifies the payload size). 1183 */ 1184static struct mbuf * 1185ieee80211_encap1(struct ieee80211vap *vap, struct mbuf *m, 1186 const struct ether_header *eh) 1187{ 1188 struct llc *llc; 1189 uint16_t payload; 1190 1191 /* XXX optimize by combining m_adj+M_PREPEND */ 1192 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1193 llc = mtod(m, struct llc *); 1194 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1195 llc->llc_control = LLC_UI; 1196 llc->llc_snap.org_code[0] = 0; 1197 llc->llc_snap.org_code[1] = 0; 1198 llc->llc_snap.org_code[2] = 0; 1199 llc->llc_snap.ether_type = eh->ether_type; 1200 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1201 1202 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1203 if (m == NULL) { /* XXX cannot happen */ 1204 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1205 "%s: no space for ether_header\n", __func__); 1206 vap->iv_stats.is_tx_nobuf++; 1207 return NULL; 1208 } 1209 ETHER_HEADER_COPY(mtod(m, void *), eh); 1210 mtod(m, struct ether_header *)->ether_type = htons(payload); 1211 return m; 1212} 1213 1214/* 1215 * Do fast frame tunnel encapsulation. The two frames and 1216 * Ethernet headers are supplied. The caller is assumed to 1217 * have arrange for space in the mbuf chains for encapsulating 1218 * headers (to avoid major mbuf fragmentation). 1219 * 1220 * The encapsulated frame is returned or NULL if there is a 1221 * problem (should not happen). 1222 */ 1223static struct mbuf * 1224ieee80211_encap_fastframe(struct ieee80211vap *vap, 1225 struct mbuf *m1, const struct ether_header *eh1, 1226 struct mbuf *m2, const struct ether_header *eh2) 1227{ 1228 struct llc *llc; 1229 struct mbuf *m; 1230 int pad; 1231 1232 /* 1233 * First, each frame gets a standard encapsulation. 1234 */ 1235 m1 = ieee80211_encap1(vap, m1, eh1); 1236 if (m1 == NULL) { 1237 m_freem(m2); 1238 return NULL; 1239 } 1240 m2 = ieee80211_encap1(vap, m2, eh2); 1241 if (m2 == NULL) { 1242 m_freem(m1); 1243 return NULL; 1244 } 1245 1246 /* 1247 * Pad leading frame to a 4-byte boundary. If there 1248 * is space at the end of the first frame, put it 1249 * there; otherwise prepend to the front of the second 1250 * frame. We know doing the second will always work 1251 * because we reserve space above. We prefer appending 1252 * as this typically has better DMA alignment properties. 1253 */ 1254 for (m = m1; m->m_next != NULL; m = m->m_next) 1255 ; 1256 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1257 if (pad) { 1258 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1259 m2->m_data -= pad; 1260 m2->m_len += pad; 1261 m2->m_pkthdr.len += pad; 1262 } else { /* append to first */ 1263 m->m_len += pad; 1264 m1->m_pkthdr.len += pad; 1265 } 1266 } 1267 1268 /* 1269 * Now, stick 'em together and prepend the tunnel headers; 1270 * first the Atheros tunnel header (all zero for now) and 1271 * then a special fast frame LLC. 1272 * 1273 * XXX optimize by prepending together 1274 */ 1275 m->m_next = m2; /* NB: last mbuf from above */ 1276 m1->m_pkthdr.len += m2->m_pkthdr.len; 1277 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1278 if (m1 == NULL) { /* XXX cannot happen */ 1279 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1280 "%s: no space for tunnel header\n", __func__); 1281 vap->iv_stats.is_tx_nobuf++; 1282 return NULL; 1283 } 1284 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1285 1286 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1287 if (m1 == NULL) { /* XXX cannot happen */ 1288 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1289 "%s: no space for llc header\n", __func__); 1290 vap->iv_stats.is_tx_nobuf++; 1291 return NULL; 1292 } 1293 llc = mtod(m1, struct llc *); 1294 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1295 llc->llc_control = LLC_UI; 1296 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1297 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1298 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1299 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1300 1301 vap->iv_stats.is_ff_encap++; 1302 1303 return m1; 1304} 1305 1306/* 1307 * Fragment the frame according to the specified mtu. 1308 * The size of the 802.11 header (w/o padding) is provided 1309 * so we don't need to recalculate it. We create a new 1310 * mbuf for each fragment and chain it through m_nextpkt; 1311 * we might be able to optimize this by reusing the original 1312 * packet's mbufs but that is significantly more complicated. 1313 */ 1314static int 1315ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1316 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1317{ 1318 struct ieee80211_frame *wh, *whf; 1319 struct mbuf *m, *prev, *next; 1320 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1321 1322 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1323 KASSERT(m0->m_pkthdr.len > mtu, 1324 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1325 1326 wh = mtod(m0, struct ieee80211_frame *); 1327 /* NB: mark the first frag; it will be propagated below */ 1328 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1329 totalhdrsize = hdrsize + ciphdrsize; 1330 fragno = 1; 1331 off = mtu - ciphdrsize; 1332 remainder = m0->m_pkthdr.len - off; 1333 prev = m0; 1334 do { 1335 fragsize = totalhdrsize + remainder; 1336 if (fragsize > mtu) 1337 fragsize = mtu; 1338 /* XXX fragsize can be >2048! */ 1339 KASSERT(fragsize < MCLBYTES, 1340 ("fragment size %u too big!", fragsize)); 1341 if (fragsize > MHLEN) 1342 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1343 else 1344 m = m_gethdr(M_DONTWAIT, MT_DATA); 1345 if (m == NULL) 1346 goto bad; 1347 /* leave room to prepend any cipher header */ 1348 m_align(m, fragsize - ciphdrsize); 1349 1350 /* 1351 * Form the header in the fragment. Note that since 1352 * we mark the first fragment with the MORE_FRAG bit 1353 * it automatically is propagated to each fragment; we 1354 * need only clear it on the last fragment (done below). 1355 */ 1356 whf = mtod(m, struct ieee80211_frame *); 1357 memcpy(whf, wh, hdrsize); 1358 *(uint16_t *)&whf->i_seq[0] |= htole16( 1359 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1360 IEEE80211_SEQ_FRAG_SHIFT); 1361 fragno++; 1362 1363 payload = fragsize - totalhdrsize; 1364 /* NB: destination is known to be contiguous */ 1365 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1366 m->m_len = hdrsize + payload; 1367 m->m_pkthdr.len = hdrsize + payload; 1368 m->m_flags |= M_FRAG; 1369 1370 /* chain up the fragment */ 1371 prev->m_nextpkt = m; 1372 prev = m; 1373 1374 /* deduct fragment just formed */ 1375 remainder -= payload; 1376 off += payload; 1377 } while (remainder != 0); 1378 1379 /* set the last fragment */ 1380 m->m_flags |= M_LASTFRAG; 1381 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1382 1383 /* strip first mbuf now that everything has been copied */ 1384 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1385 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1386 1387 vap->iv_stats.is_tx_fragframes++; 1388 vap->iv_stats.is_tx_frags += fragno-1; 1389 1390 return 1; 1391bad: 1392 /* reclaim fragments but leave original frame for caller to free */ 1393 for (m = m0->m_nextpkt; m != NULL; m = next) { 1394 next = m->m_nextpkt; 1395 m->m_nextpkt = NULL; /* XXX paranoid */ 1396 m_freem(m); 1397 } 1398 m0->m_nextpkt = NULL; 1399 return 0; 1400} 1401 1402/* 1403 * Add a supported rates element id to a frame. 1404 */ 1405static uint8_t * 1406ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1407{ 1408 int nrates; 1409 1410 *frm++ = IEEE80211_ELEMID_RATES; 1411 nrates = rs->rs_nrates; 1412 if (nrates > IEEE80211_RATE_SIZE) 1413 nrates = IEEE80211_RATE_SIZE; 1414 *frm++ = nrates; 1415 memcpy(frm, rs->rs_rates, nrates); 1416 return frm + nrates; 1417} 1418 1419/* 1420 * Add an extended supported rates element id to a frame. 1421 */ 1422static uint8_t * 1423ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1424{ 1425 /* 1426 * Add an extended supported rates element if operating in 11g mode. 1427 */ 1428 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1429 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1430 *frm++ = IEEE80211_ELEMID_XRATES; 1431 *frm++ = nrates; 1432 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1433 frm += nrates; 1434 } 1435 return frm; 1436} 1437 1438/* 1439 * Add an ssid element to a frame. 1440 */ 1441static uint8_t * 1442ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1443{ 1444 *frm++ = IEEE80211_ELEMID_SSID; 1445 *frm++ = len; 1446 memcpy(frm, ssid, len); 1447 return frm + len; 1448} 1449 1450/* 1451 * Add an erp element to a frame. 1452 */ 1453static uint8_t * 1454ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1455{ 1456 uint8_t erp; 1457 1458 *frm++ = IEEE80211_ELEMID_ERP; 1459 *frm++ = 1; 1460 erp = 0; 1461 if (ic->ic_nonerpsta != 0) 1462 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1463 if (ic->ic_flags & IEEE80211_F_USEPROT) 1464 erp |= IEEE80211_ERP_USE_PROTECTION; 1465 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1466 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1467 *frm++ = erp; 1468 return frm; 1469} 1470 1471/* 1472 * Add a CFParams element to a frame. 1473 */ 1474static uint8_t * 1475ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1476{ 1477#define ADDSHORT(frm, v) do { \ 1478 frm[0] = (v) & 0xff; \ 1479 frm[1] = (v) >> 8; \ 1480 frm += 2; \ 1481} while (0) 1482 *frm++ = IEEE80211_ELEMID_CFPARMS; 1483 *frm++ = 6; 1484 *frm++ = 0; /* CFP count */ 1485 *frm++ = 2; /* CFP period */ 1486 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1487 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1488 return frm; 1489#undef ADDSHORT 1490} 1491 1492static __inline uint8_t * 1493add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1494{ 1495 memcpy(frm, ie->ie_data, ie->ie_len); 1496 return frm + ie->ie_len; 1497} 1498 1499static __inline uint8_t * 1500add_ie(uint8_t *frm, const uint8_t *ie) 1501{ 1502 memcpy(frm, ie, 2 + ie[1]); 1503 return frm + 2 + ie[1]; 1504} 1505 1506#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1507/* 1508 * Add a WME information element to a frame. 1509 */ 1510static uint8_t * 1511ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1512{ 1513 static const struct ieee80211_wme_info info = { 1514 .wme_id = IEEE80211_ELEMID_VENDOR, 1515 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1516 .wme_oui = { WME_OUI_BYTES }, 1517 .wme_type = WME_OUI_TYPE, 1518 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1519 .wme_version = WME_VERSION, 1520 .wme_info = 0, 1521 }; 1522 memcpy(frm, &info, sizeof(info)); 1523 return frm + sizeof(info); 1524} 1525 1526/* 1527 * Add a WME parameters element to a frame. 1528 */ 1529static uint8_t * 1530ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1531{ 1532#define SM(_v, _f) (((_v) << _f##_S) & _f) 1533#define ADDSHORT(frm, v) do { \ 1534 frm[0] = (v) & 0xff; \ 1535 frm[1] = (v) >> 8; \ 1536 frm += 2; \ 1537} while (0) 1538 /* NB: this works 'cuz a param has an info at the front */ 1539 static const struct ieee80211_wme_info param = { 1540 .wme_id = IEEE80211_ELEMID_VENDOR, 1541 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1542 .wme_oui = { WME_OUI_BYTES }, 1543 .wme_type = WME_OUI_TYPE, 1544 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1545 .wme_version = WME_VERSION, 1546 }; 1547 int i; 1548 1549 memcpy(frm, ¶m, sizeof(param)); 1550 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1551 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1552 *frm++ = 0; /* reserved field */ 1553 for (i = 0; i < WME_NUM_AC; i++) { 1554 const struct wmeParams *ac = 1555 &wme->wme_bssChanParams.cap_wmeParams[i]; 1556 *frm++ = SM(i, WME_PARAM_ACI) 1557 | SM(ac->wmep_acm, WME_PARAM_ACM) 1558 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1559 ; 1560 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1561 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1562 ; 1563 ADDSHORT(frm, ac->wmep_txopLimit); 1564 } 1565 return frm; 1566#undef SM 1567#undef ADDSHORT 1568} 1569#undef WME_OUI_BYTES 1570 1571#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1572/* 1573 * Add a WME information element to a frame. 1574 */ 1575static uint8_t * 1576ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1577{ 1578 static const struct ieee80211_ath_ie info = { 1579 .ath_id = IEEE80211_ELEMID_VENDOR, 1580 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1581 .ath_oui = { ATH_OUI_BYTES }, 1582 .ath_oui_type = ATH_OUI_TYPE, 1583 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1584 .ath_version = ATH_OUI_VERSION, 1585 }; 1586 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1587 1588 memcpy(frm, &info, sizeof(info)); 1589 ath->ath_capability = caps; 1590 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1591 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1592 return frm + sizeof(info); 1593} 1594#undef ATH_OUI_BYTES 1595 1596/* 1597 * Add an 11h Power Constraint element to a frame. 1598 */ 1599static uint8_t * 1600ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1601{ 1602 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1603 /* XXX per-vap tx power limit? */ 1604 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1605 1606 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1607 frm[1] = 1; 1608 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1609 return frm + 3; 1610} 1611 1612/* 1613 * Add an 11h Power Capability element to a frame. 1614 */ 1615static uint8_t * 1616ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1617{ 1618 frm[0] = IEEE80211_ELEMID_PWRCAP; 1619 frm[1] = 2; 1620 frm[2] = c->ic_minpower; 1621 frm[3] = c->ic_maxpower; 1622 return frm + 4; 1623} 1624 1625/* 1626 * Add an 11h Supported Channels element to a frame. 1627 */ 1628static uint8_t * 1629ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1630{ 1631 static const int ielen = 26; 1632 1633 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1634 frm[1] = ielen; 1635 /* XXX not correct */ 1636 memcpy(frm+2, ic->ic_chan_avail, ielen); 1637 return frm + 2 + ielen; 1638} 1639 1640/* 1641 * Add an 11h Channel Switch Announcement element to a frame. 1642 * Note that we use the per-vap CSA count to adjust the global 1643 * counter so we can use this routine to form probe response 1644 * frames and get the current count. 1645 */ 1646static uint8_t * 1647ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1648{ 1649 struct ieee80211com *ic = vap->iv_ic; 1650 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1651 1652 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1653 csa->csa_len = 3; 1654 csa->csa_mode = 1; /* XXX force quiet on channel */ 1655 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1656 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1657 return frm + sizeof(*csa); 1658} 1659 1660/* 1661 * Add an 11h country information element to a frame. 1662 */ 1663static uint8_t * 1664ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1665{ 1666 1667 if (ic->ic_countryie == NULL || 1668 ic->ic_countryie_chan != ic->ic_bsschan) { 1669 /* 1670 * Handle lazy construction of ie. This is done on 1671 * first use and after a channel change that requires 1672 * re-calculation. 1673 */ 1674 if (ic->ic_countryie != NULL) 1675 free(ic->ic_countryie, M_80211_NODE_IE); 1676 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1677 if (ic->ic_countryie == NULL) 1678 return frm; 1679 ic->ic_countryie_chan = ic->ic_bsschan; 1680 } 1681 return add_appie(frm, ic->ic_countryie); 1682} 1683 1684/* 1685 * Send a probe request frame with the specified ssid 1686 * and any optional information element data. 1687 */ 1688int 1689ieee80211_send_probereq(struct ieee80211_node *ni, 1690 const uint8_t sa[IEEE80211_ADDR_LEN], 1691 const uint8_t da[IEEE80211_ADDR_LEN], 1692 const uint8_t bssid[IEEE80211_ADDR_LEN], 1693 const uint8_t *ssid, size_t ssidlen) 1694{ 1695 struct ieee80211vap *vap = ni->ni_vap; 1696 struct ieee80211com *ic = ni->ni_ic; 1697 const struct ieee80211_txparam *tp; 1698 struct ieee80211_bpf_params params; 1699 struct ieee80211_frame *wh; 1700 const struct ieee80211_rateset *rs; 1701 struct mbuf *m; 1702 uint8_t *frm; 1703 1704 if (vap->iv_state == IEEE80211_S_CAC) { 1705 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1706 "block %s frame in CAC state", "probe request"); 1707 vap->iv_stats.is_tx_badstate++; 1708 return EIO; /* XXX */ 1709 } 1710 1711 /* 1712 * Hold a reference on the node so it doesn't go away until after 1713 * the xmit is complete all the way in the driver. On error we 1714 * will remove our reference. 1715 */ 1716 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1717 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1718 __func__, __LINE__, 1719 ni, ether_sprintf(ni->ni_macaddr), 1720 ieee80211_node_refcnt(ni)+1); 1721 ieee80211_ref_node(ni); 1722 1723 /* 1724 * prreq frame format 1725 * [tlv] ssid 1726 * [tlv] supported rates 1727 * [tlv] RSN (optional) 1728 * [tlv] extended supported rates 1729 * [tlv] WPA (optional) 1730 * [tlv] user-specified ie's 1731 */ 1732 m = ieee80211_getmgtframe(&frm, 1733 ic->ic_headroom + sizeof(struct ieee80211_frame), 1734 2 + IEEE80211_NWID_LEN 1735 + 2 + IEEE80211_RATE_SIZE 1736 + sizeof(struct ieee80211_ie_wpa) 1737 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1738 + sizeof(struct ieee80211_ie_wpa) 1739 + (vap->iv_appie_probereq != NULL ? 1740 vap->iv_appie_probereq->ie_len : 0) 1741 ); 1742 if (m == NULL) { 1743 vap->iv_stats.is_tx_nobuf++; 1744 ieee80211_free_node(ni); 1745 return ENOMEM; 1746 } 1747 1748 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1749 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1750 frm = ieee80211_add_rates(frm, rs); 1751 if (vap->iv_flags & IEEE80211_F_WPA2) { 1752 if (vap->iv_rsn_ie != NULL) 1753 frm = add_ie(frm, vap->iv_rsn_ie); 1754 /* XXX else complain? */ 1755 } 1756 frm = ieee80211_add_xrates(frm, rs); 1757 if (vap->iv_flags & IEEE80211_F_WPA1) { 1758 if (vap->iv_wpa_ie != NULL) 1759 frm = add_ie(frm, vap->iv_wpa_ie); 1760 /* XXX else complain? */ 1761 } 1762 if (vap->iv_appie_probereq != NULL) 1763 frm = add_appie(frm, vap->iv_appie_probereq); 1764 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1765 1766 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1767 ("leading space %zd", M_LEADINGSPACE(m))); 1768 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1769 if (m == NULL) { 1770 /* NB: cannot happen */ 1771 ieee80211_free_node(ni); 1772 return ENOMEM; 1773 } 1774 1775 wh = mtod(m, struct ieee80211_frame *); 1776 ieee80211_send_setup(ni, wh, 1777 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1778 IEEE80211_NONQOS_TID, sa, da, bssid); 1779 /* XXX power management? */ 1780 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1781 1782 M_WME_SETAC(m, WME_AC_BE); 1783 1784 IEEE80211_NODE_STAT(ni, tx_probereq); 1785 IEEE80211_NODE_STAT(ni, tx_mgmt); 1786 1787 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1788 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1789 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1790 ssidlen, ssid); 1791 1792 memset(¶ms, 0, sizeof(params)); 1793 params.ibp_pri = M_WME_GETAC(m); 1794 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1795 params.ibp_rate0 = tp->mgmtrate; 1796 if (IEEE80211_IS_MULTICAST(da)) { 1797 params.ibp_flags |= IEEE80211_BPF_NOACK; 1798 params.ibp_try0 = 1; 1799 } else 1800 params.ibp_try0 = tp->maxretry; 1801 params.ibp_power = ni->ni_txpower; 1802 return ic->ic_raw_xmit(ni, m, ¶ms); 1803} 1804 1805/* 1806 * Calculate capability information for mgt frames. 1807 */ 1808static uint16_t 1809getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1810{ 1811 struct ieee80211com *ic = vap->iv_ic; 1812 uint16_t capinfo; 1813 1814 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1815 1816 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1817 capinfo = IEEE80211_CAPINFO_ESS; 1818 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1819 capinfo = IEEE80211_CAPINFO_IBSS; 1820 else 1821 capinfo = 0; 1822 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1823 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1824 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1825 IEEE80211_IS_CHAN_2GHZ(chan)) 1826 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1827 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1828 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1829 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1830 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1831 return capinfo; 1832} 1833 1834/* 1835 * Send a management frame. The node is for the destination (or ic_bss 1836 * when in station mode). Nodes other than ic_bss have their reference 1837 * count bumped to reflect our use for an indeterminant time. 1838 */ 1839int 1840ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1841{ 1842#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1843#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1844 struct ieee80211vap *vap = ni->ni_vap; 1845 struct ieee80211com *ic = ni->ni_ic; 1846 struct ieee80211_node *bss = vap->iv_bss; 1847 struct ieee80211_bpf_params params; 1848 struct mbuf *m; 1849 uint8_t *frm; 1850 uint16_t capinfo; 1851 int has_challenge, is_shared_key, ret, status; 1852 1853 KASSERT(ni != NULL, ("null node")); 1854 1855 /* 1856 * Hold a reference on the node so it doesn't go away until after 1857 * the xmit is complete all the way in the driver. On error we 1858 * will remove our reference. 1859 */ 1860 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1861 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1862 __func__, __LINE__, 1863 ni, ether_sprintf(ni->ni_macaddr), 1864 ieee80211_node_refcnt(ni)+1); 1865 ieee80211_ref_node(ni); 1866 1867 memset(¶ms, 0, sizeof(params)); 1868 switch (type) { 1869 1870 case IEEE80211_FC0_SUBTYPE_AUTH: 1871 status = arg >> 16; 1872 arg &= 0xffff; 1873 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1874 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1875 ni->ni_challenge != NULL); 1876 1877 /* 1878 * Deduce whether we're doing open authentication or 1879 * shared key authentication. We do the latter if 1880 * we're in the middle of a shared key authentication 1881 * handshake or if we're initiating an authentication 1882 * request and configured to use shared key. 1883 */ 1884 is_shared_key = has_challenge || 1885 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1886 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1887 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1888 1889 m = ieee80211_getmgtframe(&frm, 1890 ic->ic_headroom + sizeof(struct ieee80211_frame), 1891 3 * sizeof(uint16_t) 1892 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1893 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1894 ); 1895 if (m == NULL) 1896 senderr(ENOMEM, is_tx_nobuf); 1897 1898 ((uint16_t *)frm)[0] = 1899 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1900 : htole16(IEEE80211_AUTH_ALG_OPEN); 1901 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1902 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1903 1904 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1905 ((uint16_t *)frm)[3] = 1906 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1907 IEEE80211_ELEMID_CHALLENGE); 1908 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1909 IEEE80211_CHALLENGE_LEN); 1910 m->m_pkthdr.len = m->m_len = 1911 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1912 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1913 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1914 "request encrypt frame (%s)", __func__); 1915 /* mark frame for encryption */ 1916 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1917 } 1918 } else 1919 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1920 1921 /* XXX not right for shared key */ 1922 if (status == IEEE80211_STATUS_SUCCESS) 1923 IEEE80211_NODE_STAT(ni, tx_auth); 1924 else 1925 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1926 1927 if (vap->iv_opmode == IEEE80211_M_STA) 1928 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1929 (void *) vap->iv_state); 1930 break; 1931 1932 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1933 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1934 "send station deauthenticate (reason %d)", arg); 1935 m = ieee80211_getmgtframe(&frm, 1936 ic->ic_headroom + sizeof(struct ieee80211_frame), 1937 sizeof(uint16_t)); 1938 if (m == NULL) 1939 senderr(ENOMEM, is_tx_nobuf); 1940 *(uint16_t *)frm = htole16(arg); /* reason */ 1941 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1942 1943 IEEE80211_NODE_STAT(ni, tx_deauth); 1944 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1945 1946 ieee80211_node_unauthorize(ni); /* port closed */ 1947 break; 1948 1949 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1950 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1951 /* 1952 * asreq frame format 1953 * [2] capability information 1954 * [2] listen interval 1955 * [6*] current AP address (reassoc only) 1956 * [tlv] ssid 1957 * [tlv] supported rates 1958 * [tlv] extended supported rates 1959 * [4] power capability (optional) 1960 * [28] supported channels (optional) 1961 * [tlv] HT capabilities 1962 * [tlv] WME (optional) 1963 * [tlv] Vendor OUI HT capabilities (optional) 1964 * [tlv] Atheros capabilities (if negotiated) 1965 * [tlv] AppIE's (optional) 1966 */ 1967 m = ieee80211_getmgtframe(&frm, 1968 ic->ic_headroom + sizeof(struct ieee80211_frame), 1969 sizeof(uint16_t) 1970 + sizeof(uint16_t) 1971 + IEEE80211_ADDR_LEN 1972 + 2 + IEEE80211_NWID_LEN 1973 + 2 + IEEE80211_RATE_SIZE 1974 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1975 + 4 1976 + 2 + 26 1977 + sizeof(struct ieee80211_wme_info) 1978 + sizeof(struct ieee80211_ie_htcap) 1979 + 4 + sizeof(struct ieee80211_ie_htcap) 1980 + sizeof(struct ieee80211_ath_ie) 1981 + (vap->iv_appie_wpa != NULL ? 1982 vap->iv_appie_wpa->ie_len : 0) 1983 + (vap->iv_appie_assocreq != NULL ? 1984 vap->iv_appie_assocreq->ie_len : 0) 1985 ); 1986 if (m == NULL) 1987 senderr(ENOMEM, is_tx_nobuf); 1988 1989 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1990 ("wrong mode %u", vap->iv_opmode)); 1991 capinfo = IEEE80211_CAPINFO_ESS; 1992 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1993 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1994 /* 1995 * NB: Some 11a AP's reject the request when 1996 * short premable is set. 1997 */ 1998 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1999 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2000 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2001 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2002 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2003 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2004 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2005 (vap->iv_flags & IEEE80211_F_DOTH)) 2006 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2007 *(uint16_t *)frm = htole16(capinfo); 2008 frm += 2; 2009 2010 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2011 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2012 bss->ni_intval)); 2013 frm += 2; 2014 2015 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2016 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2017 frm += IEEE80211_ADDR_LEN; 2018 } 2019 2020 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2021 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2022 if (vap->iv_flags & IEEE80211_F_WPA2) { 2023 if (vap->iv_rsn_ie != NULL) 2024 frm = add_ie(frm, vap->iv_rsn_ie); 2025 /* XXX else complain? */ 2026 } 2027 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2028 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2029 frm = ieee80211_add_powercapability(frm, 2030 ic->ic_curchan); 2031 frm = ieee80211_add_supportedchannels(frm, ic); 2032 } 2033 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 2034 ni->ni_ies.htcap_ie != NULL && 2035 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2036 frm = ieee80211_add_htcap(frm, ni); 2037 if (vap->iv_flags & IEEE80211_F_WPA1) { 2038 if (vap->iv_wpa_ie != NULL) 2039 frm = add_ie(frm, vap->iv_wpa_ie); 2040 /* XXX else complain */ 2041 } 2042 if ((ic->ic_flags & IEEE80211_F_WME) && 2043 ni->ni_ies.wme_ie != NULL) 2044 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2045 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 2046 ni->ni_ies.htcap_ie != NULL && 2047 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2048 frm = ieee80211_add_htcap_vendor(frm, ni); 2049 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2050 frm = ieee80211_add_ath(frm, 2051 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2052 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 2053 ni->ni_authmode != IEEE80211_AUTH_8021X && 2054 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 2055 vap->iv_def_txkey : 0x7fff); 2056 if (vap->iv_appie_assocreq != NULL) 2057 frm = add_appie(frm, vap->iv_appie_assocreq); 2058 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2059 2060 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2061 (void *) vap->iv_state); 2062 break; 2063 2064 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2065 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2066 /* 2067 * asresp frame format 2068 * [2] capability information 2069 * [2] status 2070 * [2] association ID 2071 * [tlv] supported rates 2072 * [tlv] extended supported rates 2073 * [tlv] HT capabilities (standard, if STA enabled) 2074 * [tlv] HT information (standard, if STA enabled) 2075 * [tlv] WME (if configured and STA enabled) 2076 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2077 * [tlv] HT information (vendor OUI, if STA enabled) 2078 * [tlv] Atheros capabilities (if STA enabled) 2079 * [tlv] AppIE's (optional) 2080 */ 2081 m = ieee80211_getmgtframe(&frm, 2082 ic->ic_headroom + sizeof(struct ieee80211_frame), 2083 sizeof(uint16_t) 2084 + sizeof(uint16_t) 2085 + sizeof(uint16_t) 2086 + 2 + IEEE80211_RATE_SIZE 2087 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2088 + sizeof(struct ieee80211_ie_htcap) + 4 2089 + sizeof(struct ieee80211_ie_htinfo) + 4 2090 + sizeof(struct ieee80211_wme_param) 2091 + sizeof(struct ieee80211_ath_ie) 2092 + (vap->iv_appie_assocresp != NULL ? 2093 vap->iv_appie_assocresp->ie_len : 0) 2094 ); 2095 if (m == NULL) 2096 senderr(ENOMEM, is_tx_nobuf); 2097 2098 capinfo = getcapinfo(vap, bss->ni_chan); 2099 *(uint16_t *)frm = htole16(capinfo); 2100 frm += 2; 2101 2102 *(uint16_t *)frm = htole16(arg); /* status */ 2103 frm += 2; 2104 2105 if (arg == IEEE80211_STATUS_SUCCESS) { 2106 *(uint16_t *)frm = htole16(ni->ni_associd); 2107 IEEE80211_NODE_STAT(ni, tx_assoc); 2108 } else 2109 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2110 frm += 2; 2111 2112 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2113 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2114 /* NB: respond according to what we received */ 2115 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2116 frm = ieee80211_add_htcap(frm, ni); 2117 frm = ieee80211_add_htinfo(frm, ni); 2118 } 2119 if ((vap->iv_flags & IEEE80211_F_WME) && 2120 ni->ni_ies.wme_ie != NULL) 2121 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2122 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2123 frm = ieee80211_add_htcap_vendor(frm, ni); 2124 frm = ieee80211_add_htinfo_vendor(frm, ni); 2125 } 2126 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2127 frm = ieee80211_add_ath(frm, 2128 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2129 ni->ni_ath_defkeyix); 2130 if (vap->iv_appie_assocresp != NULL) 2131 frm = add_appie(frm, vap->iv_appie_assocresp); 2132 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2133 break; 2134 2135 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2136 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2137 "send station disassociate (reason %d)", arg); 2138 m = ieee80211_getmgtframe(&frm, 2139 ic->ic_headroom + sizeof(struct ieee80211_frame), 2140 sizeof(uint16_t)); 2141 if (m == NULL) 2142 senderr(ENOMEM, is_tx_nobuf); 2143 *(uint16_t *)frm = htole16(arg); /* reason */ 2144 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2145 2146 IEEE80211_NODE_STAT(ni, tx_disassoc); 2147 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2148 break; 2149 2150 default: 2151 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2152 "invalid mgmt frame type %u", type); 2153 senderr(EINVAL, is_tx_unknownmgt); 2154 /* NOTREACHED */ 2155 } 2156 2157 /* NB: force non-ProbeResp frames to the highest queue */ 2158 params.ibp_pri = WME_AC_VO; 2159 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2160 /* NB: we know all frames are unicast */ 2161 params.ibp_try0 = bss->ni_txparms->maxretry; 2162 params.ibp_power = bss->ni_txpower; 2163 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2164bad: 2165 ieee80211_free_node(ni); 2166 return ret; 2167#undef senderr 2168#undef HTFLAGS 2169} 2170 2171/* 2172 * Return an mbuf with a probe response frame in it. 2173 * Space is left to prepend and 802.11 header at the 2174 * front but it's left to the caller to fill in. 2175 */ 2176struct mbuf * 2177ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2178{ 2179 struct ieee80211vap *vap = bss->ni_vap; 2180 struct ieee80211com *ic = bss->ni_ic; 2181 const struct ieee80211_rateset *rs; 2182 struct mbuf *m; 2183 uint16_t capinfo; 2184 uint8_t *frm; 2185 2186 /* 2187 * probe response frame format 2188 * [8] time stamp 2189 * [2] beacon interval 2190 * [2] cabability information 2191 * [tlv] ssid 2192 * [tlv] supported rates 2193 * [tlv] parameter set (FH/DS) 2194 * [tlv] parameter set (IBSS) 2195 * [tlv] country (optional) 2196 * [3] power control (optional) 2197 * [5] channel switch announcement (CSA) (optional) 2198 * [tlv] extended rate phy (ERP) 2199 * [tlv] extended supported rates 2200 * [tlv] RSN (optional) 2201 * [tlv] HT capabilities 2202 * [tlv] HT information 2203 * [tlv] WPA (optional) 2204 * [tlv] WME (optional) 2205 * [tlv] Vendor OUI HT capabilities (optional) 2206 * [tlv] Vendor OUI HT information (optional) 2207 * [tlv] Atheros capabilities 2208 * [tlv] AppIE's (optional) 2209 */ 2210 m = ieee80211_getmgtframe(&frm, 2211 ic->ic_headroom + sizeof(struct ieee80211_frame), 2212 8 2213 + sizeof(uint16_t) 2214 + sizeof(uint16_t) 2215 + 2 + IEEE80211_NWID_LEN 2216 + 2 + IEEE80211_RATE_SIZE 2217 + 7 /* max(7,3) */ 2218 + IEEE80211_COUNTRY_MAX_SIZE 2219 + 3 2220 + sizeof(struct ieee80211_csa_ie) 2221 + 3 2222 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2223 + sizeof(struct ieee80211_ie_wpa) 2224 + sizeof(struct ieee80211_ie_htcap) 2225 + sizeof(struct ieee80211_ie_htinfo) 2226 + sizeof(struct ieee80211_ie_wpa) 2227 + sizeof(struct ieee80211_wme_param) 2228 + 4 + sizeof(struct ieee80211_ie_htcap) 2229 + 4 + sizeof(struct ieee80211_ie_htinfo) 2230 + sizeof(struct ieee80211_ath_ie) 2231 + (vap->iv_appie_proberesp != NULL ? 2232 vap->iv_appie_proberesp->ie_len : 0) 2233 ); 2234 if (m == NULL) { 2235 vap->iv_stats.is_tx_nobuf++; 2236 return NULL; 2237 } 2238 2239 memset(frm, 0, 8); /* timestamp should be filled later */ 2240 frm += 8; 2241 *(uint16_t *)frm = htole16(bss->ni_intval); 2242 frm += 2; 2243 capinfo = getcapinfo(vap, bss->ni_chan); 2244 *(uint16_t *)frm = htole16(capinfo); 2245 frm += 2; 2246 2247 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2248 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2249 frm = ieee80211_add_rates(frm, rs); 2250 2251 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2252 *frm++ = IEEE80211_ELEMID_FHPARMS; 2253 *frm++ = 5; 2254 *frm++ = bss->ni_fhdwell & 0x00ff; 2255 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2256 *frm++ = IEEE80211_FH_CHANSET( 2257 ieee80211_chan2ieee(ic, bss->ni_chan)); 2258 *frm++ = IEEE80211_FH_CHANPAT( 2259 ieee80211_chan2ieee(ic, bss->ni_chan)); 2260 *frm++ = bss->ni_fhindex; 2261 } else { 2262 *frm++ = IEEE80211_ELEMID_DSPARMS; 2263 *frm++ = 1; 2264 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2265 } 2266 2267 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2268 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2269 *frm++ = 2; 2270 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2271 } 2272 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2273 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2274 frm = ieee80211_add_countryie(frm, ic); 2275 if (vap->iv_flags & IEEE80211_F_DOTH) { 2276 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2277 frm = ieee80211_add_powerconstraint(frm, vap); 2278 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2279 frm = ieee80211_add_csa(frm, vap); 2280 } 2281 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2282 frm = ieee80211_add_erp(frm, ic); 2283 frm = ieee80211_add_xrates(frm, rs); 2284 if (vap->iv_flags & IEEE80211_F_WPA2) { 2285 if (vap->iv_rsn_ie != NULL) 2286 frm = add_ie(frm, vap->iv_rsn_ie); 2287 /* XXX else complain? */ 2288 } 2289 /* 2290 * NB: legacy 11b clients do not get certain ie's. 2291 * The caller identifies such clients by passing 2292 * a token in legacy to us. Could expand this to be 2293 * any legacy client for stuff like HT ie's. 2294 */ 2295 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2296 legacy != IEEE80211_SEND_LEGACY_11B) { 2297 frm = ieee80211_add_htcap(frm, bss); 2298 frm = ieee80211_add_htinfo(frm, bss); 2299 } 2300 if (vap->iv_flags & IEEE80211_F_WPA1) { 2301 if (vap->iv_wpa_ie != NULL) 2302 frm = add_ie(frm, vap->iv_wpa_ie); 2303 /* XXX else complain? */ 2304 } 2305 if (vap->iv_flags & IEEE80211_F_WME) 2306 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2307 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2308 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2309 legacy != IEEE80211_SEND_LEGACY_11B) { 2310 frm = ieee80211_add_htcap_vendor(frm, bss); 2311 frm = ieee80211_add_htinfo_vendor(frm, bss); 2312 } 2313 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2314 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2315 bss->ni_ath_defkeyix); 2316 if (vap->iv_appie_proberesp != NULL) 2317 frm = add_appie(frm, vap->iv_appie_proberesp); 2318 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2319 2320 return m; 2321} 2322 2323/* 2324 * Send a probe response frame to the specified mac address. 2325 * This does not go through the normal mgt frame api so we 2326 * can specify the destination address and re-use the bss node 2327 * for the sta reference. 2328 */ 2329int 2330ieee80211_send_proberesp(struct ieee80211vap *vap, 2331 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2332{ 2333 struct ieee80211_node *bss = vap->iv_bss; 2334 struct ieee80211com *ic = vap->iv_ic; 2335 struct ieee80211_frame *wh; 2336 struct mbuf *m; 2337 2338 if (vap->iv_state == IEEE80211_S_CAC) { 2339 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2340 "block %s frame in CAC state", "probe response"); 2341 vap->iv_stats.is_tx_badstate++; 2342 return EIO; /* XXX */ 2343 } 2344 2345 /* 2346 * Hold a reference on the node so it doesn't go away until after 2347 * the xmit is complete all the way in the driver. On error we 2348 * will remove our reference. 2349 */ 2350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2351 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2352 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2353 ieee80211_node_refcnt(bss)+1); 2354 ieee80211_ref_node(bss); 2355 2356 m = ieee80211_alloc_proberesp(bss, legacy); 2357 if (m == NULL) { 2358 ieee80211_free_node(bss); 2359 return ENOMEM; 2360 } 2361 2362 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2363 KASSERT(m != NULL, ("no room for header")); 2364 2365 wh = mtod(m, struct ieee80211_frame *); 2366 ieee80211_send_setup(bss, wh, 2367 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2368 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2369 /* XXX power management? */ 2370 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2371 2372 M_WME_SETAC(m, WME_AC_BE); 2373 2374 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2375 "send probe resp on channel %u to %s%s\n", 2376 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2377 legacy ? " <legacy>" : ""); 2378 IEEE80211_NODE_STAT(bss, tx_mgmt); 2379 2380 return ic->ic_raw_xmit(bss, m, NULL); 2381} 2382 2383/* 2384 * Allocate and build a RTS (Request To Send) control frame. 2385 */ 2386struct mbuf * 2387ieee80211_alloc_rts(struct ieee80211com *ic, 2388 const uint8_t ra[IEEE80211_ADDR_LEN], 2389 const uint8_t ta[IEEE80211_ADDR_LEN], 2390 uint16_t dur) 2391{ 2392 struct ieee80211_frame_rts *rts; 2393 struct mbuf *m; 2394 2395 /* XXX honor ic_headroom */ 2396 m = m_gethdr(M_DONTWAIT, MT_DATA); 2397 if (m != NULL) { 2398 rts = mtod(m, struct ieee80211_frame_rts *); 2399 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2400 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2401 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2402 *(u_int16_t *)rts->i_dur = htole16(dur); 2403 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2404 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2405 2406 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2407 } 2408 return m; 2409} 2410 2411/* 2412 * Allocate and build a CTS (Clear To Send) control frame. 2413 */ 2414struct mbuf * 2415ieee80211_alloc_cts(struct ieee80211com *ic, 2416 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2417{ 2418 struct ieee80211_frame_cts *cts; 2419 struct mbuf *m; 2420 2421 /* XXX honor ic_headroom */ 2422 m = m_gethdr(M_DONTWAIT, MT_DATA); 2423 if (m != NULL) { 2424 cts = mtod(m, struct ieee80211_frame_cts *); 2425 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2426 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2427 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2428 *(u_int16_t *)cts->i_dur = htole16(dur); 2429 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2430 2431 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2432 } 2433 return m; 2434} 2435 2436static void 2437ieee80211_tx_mgt_timeout(void *arg) 2438{ 2439 struct ieee80211_node *ni = arg; 2440 struct ieee80211vap *vap = ni->ni_vap; 2441 2442 if (vap->iv_state != IEEE80211_S_INIT && 2443 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2444 /* 2445 * NB: it's safe to specify a timeout as the reason here; 2446 * it'll only be used in the right state. 2447 */ 2448 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2449 IEEE80211_SCAN_FAIL_TIMEOUT); 2450 } 2451} 2452 2453static void 2454ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2455{ 2456 struct ieee80211vap *vap = ni->ni_vap; 2457 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2458 2459 /* 2460 * Frame transmit completed; arrange timer callback. If 2461 * transmit was successfuly we wait for response. Otherwise 2462 * we arrange an immediate callback instead of doing the 2463 * callback directly since we don't know what state the driver 2464 * is in (e.g. what locks it is holding). This work should 2465 * not be too time-critical and not happen too often so the 2466 * added overhead is acceptable. 2467 * 2468 * XXX what happens if !acked but response shows up before callback? 2469 */ 2470 if (vap->iv_state == ostate) 2471 callout_reset(&vap->iv_mgtsend, 2472 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2473 ieee80211_tx_mgt_timeout, ni); 2474} 2475 2476static void 2477ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2478 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2479{ 2480 struct ieee80211vap *vap = ni->ni_vap; 2481 struct ieee80211com *ic = ni->ni_ic; 2482 struct ieee80211_rateset *rs = &ni->ni_rates; 2483 uint16_t capinfo; 2484 2485 /* 2486 * beacon frame format 2487 * [8] time stamp 2488 * [2] beacon interval 2489 * [2] cabability information 2490 * [tlv] ssid 2491 * [tlv] supported rates 2492 * [3] parameter set (DS) 2493 * [8] CF parameter set (optional) 2494 * [tlv] parameter set (IBSS/TIM) 2495 * [tlv] country (optional) 2496 * [3] power control (optional) 2497 * [5] channel switch announcement (CSA) (optional) 2498 * [tlv] extended rate phy (ERP) 2499 * [tlv] extended supported rates 2500 * [tlv] RSN parameters 2501 * [tlv] HT capabilities 2502 * [tlv] HT information 2503 * XXX Vendor-specific OIDs (e.g. Atheros) 2504 * [tlv] WPA parameters 2505 * [tlv] WME parameters 2506 * [tlv] Vendor OUI HT capabilities (optional) 2507 * [tlv] Vendor OUI HT information (optional) 2508 * [tlv] TDMA parameters (optional) 2509 * [tlv] application data (optional) 2510 */ 2511 2512 memset(bo, 0, sizeof(*bo)); 2513 2514 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2515 frm += 8; 2516 *(uint16_t *)frm = htole16(ni->ni_intval); 2517 frm += 2; 2518 capinfo = getcapinfo(vap, ni->ni_chan); 2519 bo->bo_caps = (uint16_t *)frm; 2520 *(uint16_t *)frm = htole16(capinfo); 2521 frm += 2; 2522 *frm++ = IEEE80211_ELEMID_SSID; 2523 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2524 *frm++ = ni->ni_esslen; 2525 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2526 frm += ni->ni_esslen; 2527 } else 2528 *frm++ = 0; 2529 frm = ieee80211_add_rates(frm, rs); 2530 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2531 *frm++ = IEEE80211_ELEMID_DSPARMS; 2532 *frm++ = 1; 2533 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2534 } 2535 if (ic->ic_flags & IEEE80211_F_PCF) { 2536 bo->bo_cfp = frm; 2537 frm = ieee80211_add_cfparms(frm, ic); 2538 } 2539 bo->bo_tim = frm; 2540 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2541 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2542 *frm++ = 2; 2543 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2544 bo->bo_tim_len = 0; 2545 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2546 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2547 2548 tie->tim_ie = IEEE80211_ELEMID_TIM; 2549 tie->tim_len = 4; /* length */ 2550 tie->tim_count = 0; /* DTIM count */ 2551 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2552 tie->tim_bitctl = 0; /* bitmap control */ 2553 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2554 frm += sizeof(struct ieee80211_tim_ie); 2555 bo->bo_tim_len = 1; 2556 } 2557 bo->bo_tim_trailer = frm; 2558 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2559 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2560 frm = ieee80211_add_countryie(frm, ic); 2561 if (vap->iv_flags & IEEE80211_F_DOTH) { 2562 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2563 frm = ieee80211_add_powerconstraint(frm, vap); 2564 bo->bo_csa = frm; 2565 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2566 frm = ieee80211_add_csa(frm, vap); 2567 } else 2568 bo->bo_csa = frm; 2569 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2570 bo->bo_erp = frm; 2571 frm = ieee80211_add_erp(frm, ic); 2572 } 2573 frm = ieee80211_add_xrates(frm, rs); 2574 if (vap->iv_flags & IEEE80211_F_WPA2) { 2575 if (vap->iv_rsn_ie != NULL) 2576 frm = add_ie(frm, vap->iv_rsn_ie); 2577 /* XXX else complain */ 2578 } 2579 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2580 frm = ieee80211_add_htcap(frm, ni); 2581 bo->bo_htinfo = frm; 2582 frm = ieee80211_add_htinfo(frm, ni); 2583 } 2584 if (vap->iv_flags & IEEE80211_F_WPA1) { 2585 if (vap->iv_wpa_ie != NULL) 2586 frm = add_ie(frm, vap->iv_wpa_ie); 2587 /* XXX else complain */ 2588 } 2589 if (vap->iv_flags & IEEE80211_F_WME) { 2590 bo->bo_wme = frm; 2591 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2592 } 2593 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2594 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2595 frm = ieee80211_add_htcap_vendor(frm, ni); 2596 frm = ieee80211_add_htinfo_vendor(frm, ni); 2597 } 2598#ifdef IEEE80211_SUPPORT_TDMA 2599 if (vap->iv_caps & IEEE80211_C_TDMA) { 2600 bo->bo_tdma = frm; 2601 frm = ieee80211_add_tdma(frm, vap); 2602 } 2603#endif 2604 if (vap->iv_appie_beacon != NULL) { 2605 bo->bo_appie = frm; 2606 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2607 frm = add_appie(frm, vap->iv_appie_beacon); 2608 } 2609 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2610 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2611 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2612} 2613 2614/* 2615 * Allocate a beacon frame and fillin the appropriate bits. 2616 */ 2617struct mbuf * 2618ieee80211_beacon_alloc(struct ieee80211_node *ni, 2619 struct ieee80211_beacon_offsets *bo) 2620{ 2621 struct ieee80211vap *vap = ni->ni_vap; 2622 struct ieee80211com *ic = ni->ni_ic; 2623 struct ifnet *ifp = vap->iv_ifp; 2624 struct ieee80211_frame *wh; 2625 struct mbuf *m; 2626 int pktlen; 2627 uint8_t *frm; 2628 2629 /* 2630 * beacon frame format 2631 * [8] time stamp 2632 * [2] beacon interval 2633 * [2] cabability information 2634 * [tlv] ssid 2635 * [tlv] supported rates 2636 * [3] parameter set (DS) 2637 * [8] CF parameter set (optional) 2638 * [tlv] parameter set (IBSS/TIM) 2639 * [tlv] country (optional) 2640 * [3] power control (optional) 2641 * [5] channel switch announcement (CSA) (optional) 2642 * [tlv] extended rate phy (ERP) 2643 * [tlv] extended supported rates 2644 * [tlv] RSN parameters 2645 * [tlv] HT capabilities 2646 * [tlv] HT information 2647 * [tlv] Vendor OUI HT capabilities (optional) 2648 * [tlv] Vendor OUI HT information (optional) 2649 * XXX Vendor-specific OIDs (e.g. Atheros) 2650 * [tlv] WPA parameters 2651 * [tlv] WME parameters 2652 * [tlv] TDMA parameters (optional) 2653 * [tlv] application data (optional) 2654 * NB: we allocate the max space required for the TIM bitmap. 2655 * XXX how big is this? 2656 */ 2657 pktlen = 8 /* time stamp */ 2658 + sizeof(uint16_t) /* beacon interval */ 2659 + sizeof(uint16_t) /* capabilities */ 2660 + 2 + ni->ni_esslen /* ssid */ 2661 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2662 + 2 + 1 /* DS parameters */ 2663 + 2 + 6 /* CF parameters */ 2664 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2665 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2666 + 2 + 1 /* power control */ 2667 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2668 + 2 + 1 /* ERP */ 2669 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2670 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2671 2*sizeof(struct ieee80211_ie_wpa) : 0) 2672 /* XXX conditional? */ 2673 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2674 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2675 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2676 sizeof(struct ieee80211_wme_param) : 0) 2677#ifdef IEEE80211_SUPPORT_TDMA 2678 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2679 sizeof(struct ieee80211_tdma_param) : 0) 2680#endif 2681 + IEEE80211_MAX_APPIE 2682 ; 2683 m = ieee80211_getmgtframe(&frm, 2684 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2685 if (m == NULL) { 2686 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2687 "%s: cannot get buf; size %u\n", __func__, pktlen); 2688 vap->iv_stats.is_tx_nobuf++; 2689 return NULL; 2690 } 2691 ieee80211_beacon_construct(m, frm, bo, ni); 2692 2693 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2694 KASSERT(m != NULL, ("no space for 802.11 header?")); 2695 wh = mtod(m, struct ieee80211_frame *); 2696 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2697 IEEE80211_FC0_SUBTYPE_BEACON; 2698 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2699 *(uint16_t *)wh->i_dur = 0; 2700 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2701 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2702 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2703 *(uint16_t *)wh->i_seq = 0; 2704 2705 return m; 2706} 2707 2708/* 2709 * Update the dynamic parts of a beacon frame based on the current state. 2710 */ 2711int 2712ieee80211_beacon_update(struct ieee80211_node *ni, 2713 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2714{ 2715 struct ieee80211vap *vap = ni->ni_vap; 2716 struct ieee80211com *ic = ni->ni_ic; 2717 int len_changed = 0; 2718 uint16_t capinfo; 2719 2720 IEEE80211_LOCK(ic); 2721 /* 2722 * Handle 11h channel change when we've reached the count. 2723 * We must recalculate the beacon frame contents to account 2724 * for the new channel. Note we do this only for the first 2725 * vap that reaches this point; subsequent vaps just update 2726 * their beacon state to reflect the recalculated channel. 2727 */ 2728 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2729 vap->iv_csa_count == ic->ic_csa_count) { 2730 vap->iv_csa_count = 0; 2731 /* 2732 * Effect channel change before reconstructing the beacon 2733 * frame contents as many places reference ni_chan. 2734 */ 2735 if (ic->ic_csa_newchan != NULL) 2736 ieee80211_csa_completeswitch(ic); 2737 /* 2738 * NB: ieee80211_beacon_construct clears all pending 2739 * updates in bo_flags so we don't need to explicitly 2740 * clear IEEE80211_BEACON_CSA. 2741 */ 2742 ieee80211_beacon_construct(m, 2743 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2744 2745 /* XXX do WME aggressive mode processing? */ 2746 IEEE80211_UNLOCK(ic); 2747 return 1; /* just assume length changed */ 2748 } 2749 2750 /* XXX faster to recalculate entirely or just changes? */ 2751 capinfo = getcapinfo(vap, ni->ni_chan); 2752 *bo->bo_caps = htole16(capinfo); 2753 2754 if (vap->iv_flags & IEEE80211_F_WME) { 2755 struct ieee80211_wme_state *wme = &ic->ic_wme; 2756 2757 /* 2758 * Check for agressive mode change. When there is 2759 * significant high priority traffic in the BSS 2760 * throttle back BE traffic by using conservative 2761 * parameters. Otherwise BE uses agressive params 2762 * to optimize performance of legacy/non-QoS traffic. 2763 */ 2764 if (wme->wme_flags & WME_F_AGGRMODE) { 2765 if (wme->wme_hipri_traffic > 2766 wme->wme_hipri_switch_thresh) { 2767 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2768 "%s: traffic %u, disable aggressive mode\n", 2769 __func__, wme->wme_hipri_traffic); 2770 wme->wme_flags &= ~WME_F_AGGRMODE; 2771 ieee80211_wme_updateparams_locked(vap); 2772 wme->wme_hipri_traffic = 2773 wme->wme_hipri_switch_hysteresis; 2774 } else 2775 wme->wme_hipri_traffic = 0; 2776 } else { 2777 if (wme->wme_hipri_traffic <= 2778 wme->wme_hipri_switch_thresh) { 2779 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2780 "%s: traffic %u, enable aggressive mode\n", 2781 __func__, wme->wme_hipri_traffic); 2782 wme->wme_flags |= WME_F_AGGRMODE; 2783 ieee80211_wme_updateparams_locked(vap); 2784 wme->wme_hipri_traffic = 0; 2785 } else 2786 wme->wme_hipri_traffic = 2787 wme->wme_hipri_switch_hysteresis; 2788 } 2789 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2790 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2791 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2792 } 2793 } 2794 2795 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2796 ieee80211_ht_update_beacon(vap, bo); 2797 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2798 } 2799#ifdef IEEE80211_SUPPORT_TDMA 2800 if (vap->iv_caps & IEEE80211_C_TDMA) { 2801 /* 2802 * NB: the beacon is potentially updated every TBTT. 2803 */ 2804 ieee80211_tdma_update_beacon(vap, bo); 2805 } 2806#endif 2807 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2808 struct ieee80211_tim_ie *tie = 2809 (struct ieee80211_tim_ie *) bo->bo_tim; 2810 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2811 u_int timlen, timoff, i; 2812 /* 2813 * ATIM/DTIM needs updating. If it fits in the 2814 * current space allocated then just copy in the 2815 * new bits. Otherwise we need to move any trailing 2816 * data to make room. Note that we know there is 2817 * contiguous space because ieee80211_beacon_allocate 2818 * insures there is space in the mbuf to write a 2819 * maximal-size virtual bitmap (based on iv_max_aid). 2820 */ 2821 /* 2822 * Calculate the bitmap size and offset, copy any 2823 * trailer out of the way, and then copy in the 2824 * new bitmap and update the information element. 2825 * Note that the tim bitmap must contain at least 2826 * one byte and any offset must be even. 2827 */ 2828 if (vap->iv_ps_pending != 0) { 2829 timoff = 128; /* impossibly large */ 2830 for (i = 0; i < vap->iv_tim_len; i++) 2831 if (vap->iv_tim_bitmap[i]) { 2832 timoff = i &~ 1; 2833 break; 2834 } 2835 KASSERT(timoff != 128, ("tim bitmap empty!")); 2836 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2837 if (vap->iv_tim_bitmap[i]) 2838 break; 2839 timlen = 1 + (i - timoff); 2840 } else { 2841 timoff = 0; 2842 timlen = 1; 2843 } 2844 if (timlen != bo->bo_tim_len) { 2845 /* copy up/down trailer */ 2846 int adjust = tie->tim_bitmap+timlen 2847 - bo->bo_tim_trailer; 2848 ovbcopy(bo->bo_tim_trailer, 2849 bo->bo_tim_trailer+adjust, 2850 bo->bo_tim_trailer_len); 2851 bo->bo_tim_trailer += adjust; 2852 bo->bo_erp += adjust; 2853 bo->bo_htinfo += adjust; 2854 bo->bo_appie += adjust; 2855 bo->bo_wme += adjust; 2856 bo->bo_csa += adjust; 2857 bo->bo_tim_len = timlen; 2858 2859 /* update information element */ 2860 tie->tim_len = 3 + timlen; 2861 tie->tim_bitctl = timoff; 2862 len_changed = 1; 2863 } 2864 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2865 bo->bo_tim_len); 2866 2867 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2868 2869 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2870 "%s: TIM updated, pending %u, off %u, len %u\n", 2871 __func__, vap->iv_ps_pending, timoff, timlen); 2872 } 2873 /* count down DTIM period */ 2874 if (tie->tim_count == 0) 2875 tie->tim_count = tie->tim_period - 1; 2876 else 2877 tie->tim_count--; 2878 /* update state for buffered multicast frames on DTIM */ 2879 if (mcast && tie->tim_count == 0) 2880 tie->tim_bitctl |= 1; 2881 else 2882 tie->tim_bitctl &= ~1; 2883 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2884 struct ieee80211_csa_ie *csa = 2885 (struct ieee80211_csa_ie *) bo->bo_csa; 2886 2887 /* 2888 * Insert or update CSA ie. If we're just starting 2889 * to count down to the channel switch then we need 2890 * to insert the CSA ie. Otherwise we just need to 2891 * drop the count. The actual change happens above 2892 * when the vap's count reaches the target count. 2893 */ 2894 if (vap->iv_csa_count == 0) { 2895 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2896 bo->bo_erp += sizeof(*csa); 2897 bo->bo_wme += sizeof(*csa); 2898 bo->bo_appie += sizeof(*csa); 2899 bo->bo_csa_trailer_len += sizeof(*csa); 2900 bo->bo_tim_trailer_len += sizeof(*csa); 2901 m->m_len += sizeof(*csa); 2902 m->m_pkthdr.len += sizeof(*csa); 2903 2904 ieee80211_add_csa(bo->bo_csa, vap); 2905 } else 2906 csa->csa_count--; 2907 vap->iv_csa_count++; 2908 /* NB: don't clear IEEE80211_BEACON_CSA */ 2909 } 2910 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2911 /* 2912 * ERP element needs updating. 2913 */ 2914 (void) ieee80211_add_erp(bo->bo_erp, ic); 2915 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2916 } 2917 } 2918 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2919 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2920 int aielen; 2921 uint8_t *frm; 2922 2923 aielen = 0; 2924 if (aie != NULL) 2925 aielen += aie->ie_len; 2926 if (aielen != bo->bo_appie_len) { 2927 /* copy up/down trailer */ 2928 int adjust = aielen - bo->bo_appie_len; 2929 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2930 bo->bo_tim_trailer_len); 2931 bo->bo_tim_trailer += adjust; 2932 bo->bo_appie += adjust; 2933 bo->bo_appie_len = aielen; 2934 2935 len_changed = 1; 2936 } 2937 frm = bo->bo_appie; 2938 if (aie != NULL) 2939 frm = add_appie(frm, aie); 2940 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2941 } 2942 IEEE80211_UNLOCK(ic); 2943 2944 return len_changed; 2945} 2946