ieee80211_output.c revision 190448
1275970Scy/*- 2275970Scy * Copyright (c) 2001 Atsushi Onoe 3275970Scy * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4275970Scy * All rights reserved. 5275970Scy * 6275970Scy * Redistribution and use in source and binary forms, with or without 7275970Scy * modification, are permitted provided that the following conditions 8275970Scy * are met: 9275970Scy * 1. Redistributions of source code must retain the above copyright 10275970Scy * notice, this list of conditions and the following disclaimer. 11275970Scy * 2. Redistributions in binary form must reproduce the above copyright 12275970Scy * notice, this list of conditions and the following disclaimer in the 13275970Scy * documentation and/or other materials provided with the distribution. 14275970Scy * 15275970Scy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16275970Scy * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17275970Scy * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18275970Scy * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19275970Scy * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20275970Scy * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21275970Scy * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22275970Scy * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23275970Scy * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24275970Scy * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25275970Scy */ 26275970Scy 27275970Scy#include <sys/cdefs.h> 28275970Scy__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 190448 2009-03-26 19:04:11Z sam $"); 29275970Scy 30275970Scy#include "opt_inet.h" 31275970Scy#include "opt_wlan.h" 32275970Scy 33275970Scy#include <sys/param.h> 34275970Scy#include <sys/systm.h> 35275970Scy#include <sys/mbuf.h> 36275970Scy#include <sys/kernel.h> 37275970Scy#include <sys/endian.h> 38275970Scy 39275970Scy#include <sys/socket.h> 40275970Scy 41275970Scy#include <net/bpf.h> 42275970Scy#include <net/ethernet.h> 43275970Scy#include <net/if.h> 44275970Scy#include <net/if_llc.h> 45275970Scy#include <net/if_media.h> 46275970Scy#include <net/if_vlan_var.h> 47275970Scy 48275970Scy#include <net80211/ieee80211_var.h> 49275970Scy#include <net80211/ieee80211_regdomain.h> 50275970Scy#ifdef IEEE80211_SUPPORT_SUPERG 51275970Scy#include <net80211/ieee80211_superg.h> 52275970Scy#endif 53275970Scy#ifdef IEEE80211_SUPPORT_TDMA 54275970Scy#include <net80211/ieee80211_tdma.h> 55275970Scy#endif 56275970Scy#include <net80211/ieee80211_wds.h> 57275970Scy 58275970Scy#ifdef INET 59275970Scy#include <netinet/in.h> 60275970Scy#include <netinet/if_ether.h> 61275970Scy#include <netinet/in_systm.h> 62275970Scy#include <netinet/ip.h> 63275970Scy#endif 64275970Scy 65275970Scy#define ETHER_HEADER_COPY(dst, src) \ 66275970Scy memcpy(dst, src, sizeof(struct ether_header)) 67275970Scy 68275970Scystatic int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 69275970Scy u_int hdrsize, u_int ciphdrsize, u_int mtu); 70275970Scystatic void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 71275970Scy 72275970Scy#ifdef IEEE80211_DEBUG 73275970Scy/* 74275970Scy * Decide if an outbound management frame should be 75275970Scy * printed when debugging is enabled. This filters some 76275970Scy * of the less interesting frames that come frequently 77275970Scy * (e.g. beacons). 78275970Scy */ 79275970Scystatic __inline int 80275970Scydoprint(struct ieee80211vap *vap, int subtype) 81275970Scy{ 82275970Scy switch (subtype) { 83275970Scy case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 84275970Scy return (vap->iv_opmode == IEEE80211_M_IBSS); 85275970Scy } 86275970Scy return 1; 87275970Scy} 88275970Scy#endif 89275970Scy 90275970Scy/* 91275970Scy * Start method for vap's. All packets from the stack come 92275970Scy * through here. We handle common processing of the packets 93275970Scy * before dispatching them to the underlying device. 94275970Scy */ 95275970Scyvoid 96275970Scyieee80211_start(struct ifnet *ifp) 97275970Scy{ 98275970Scy#define IS_DWDS(vap) \ 99275970Scy (vap->iv_opmode == IEEE80211_M_WDS && \ 100275970Scy (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 101275970Scy struct ieee80211vap *vap = ifp->if_softc; 102275970Scy struct ieee80211com *ic = vap->iv_ic; 103275970Scy struct ifnet *parent = ic->ic_ifp; 104275970Scy struct ieee80211_node *ni; 105275970Scy struct mbuf *m; 106275970Scy struct ether_header *eh; 107275970Scy int error; 108275970Scy 109275970Scy /* NB: parent must be up and running */ 110275970Scy if (!IFNET_IS_UP_RUNNING(parent)) { 111275970Scy IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 112275970Scy "%s: ignore queue, parent %s not up+running\n", 113275970Scy __func__, parent->if_xname); 114275970Scy /* XXX stat */ 115275970Scy return; 116275970Scy } 117275970Scy if (vap->iv_state == IEEE80211_S_SLEEP) { 118275970Scy /* 119275970Scy * In power save, wakeup device for transmit. 120275970Scy */ 121275970Scy ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 122275970Scy return; 123275970Scy } 124275970Scy /* 125275970Scy * No data frames go out unless we're running. 126275970Scy * Note in particular this covers CAC and CSA 127275970Scy * states (though maybe we should check muting 128275970Scy * for CSA). 129275970Scy */ 130275970Scy if (vap->iv_state != IEEE80211_S_RUN) { 131275970Scy IEEE80211_LOCK(ic); 132275970Scy /* re-check under the com lock to avoid races */ 133275970Scy if (vap->iv_state != IEEE80211_S_RUN) { 134275970Scy IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 135275970Scy "%s: ignore queue, in %s state\n", 136275970Scy __func__, ieee80211_state_name[vap->iv_state]); 137275970Scy vap->iv_stats.is_tx_badstate++; 138275970Scy ifp->if_drv_flags |= IFF_DRV_OACTIVE; 139275970Scy IEEE80211_UNLOCK(ic); 140275970Scy return; 141275970Scy } 142275970Scy IEEE80211_UNLOCK(ic); 143275970Scy } 144275970Scy for (;;) { 145275970Scy IFQ_DEQUEUE(&ifp->if_snd, m); 146275970Scy if (m == NULL) 147275970Scy break; 148275970Scy /* 149275970Scy * Sanitize mbuf flags for net80211 use. We cannot 150275970Scy * clear M_PWR_SAV because this may be set for frames 151275970Scy * that are re-submitted from the power save queue. 152275970Scy * 153275970Scy * NB: This must be done before ieee80211_classify as 154275970Scy * it marks EAPOL in frames with M_EAPOL. 155275970Scy */ 156275970Scy m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 157275970Scy /* 158275970Scy * Cancel any background scan. 159275970Scy */ 160275970Scy if (ic->ic_flags & IEEE80211_F_SCAN) 161275970Scy ieee80211_cancel_anyscan(vap); 162275970Scy /* 163275970Scy * Find the node for the destination so we can do 164275970Scy * things like power save and fast frames aggregation. 165275970Scy * 166275970Scy * NB: past this point various code assumes the first 167275970Scy * mbuf has the 802.3 header present (and contiguous). 168275970Scy */ 169275970Scy ni = NULL; 170275970Scy if (m->m_len < sizeof(struct ether_header) && 171275970Scy (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 172275970Scy IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 173275970Scy "discard frame, %s\n", "m_pullup failed"); 174275970Scy vap->iv_stats.is_tx_nobuf++; /* XXX */ 175275970Scy ifp->if_oerrors++; 176275970Scy continue; 177275970Scy } 178275970Scy eh = mtod(m, struct ether_header *); 179275970Scy if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 180275970Scy if (IS_DWDS(vap)) { 181275970Scy /* 182275970Scy * Only unicast frames from the above go out 183275970Scy * DWDS vaps; multicast frames are handled by 184275970Scy * dispatching the frame as it comes through 185275970Scy * the AP vap (see below). 186275970Scy */ 187275970Scy IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 188275970Scy eh->ether_dhost, "mcast", "%s", "on DWDS"); 189275970Scy vap->iv_stats.is_dwds_mcast++; 190275970Scy m_freem(m); 191275970Scy continue; 192275970Scy } 193275970Scy if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 194275970Scy /* 195275970Scy * Spam DWDS vap's w/ multicast traffic. 196275970Scy */ 197275970Scy /* XXX only if dwds in use? */ 198275970Scy ieee80211_dwds_mcast(vap, m); 199275970Scy } 200275970Scy } 201275970Scy ni = ieee80211_find_txnode(vap, eh->ether_dhost); 202275970Scy if (ni == NULL) { 203275970Scy /* NB: ieee80211_find_txnode does stat+msg */ 204275970Scy ifp->if_oerrors++; 205275970Scy m_freem(m); 206275970Scy continue; 207275970Scy } 208275970Scy if (ni->ni_associd == 0 && 209275970Scy (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 210275970Scy IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 211275970Scy eh->ether_dhost, NULL, 212275970Scy "sta not associated (type 0x%04x)", 213275970Scy htons(eh->ether_type)); 214275970Scy vap->iv_stats.is_tx_notassoc++; 215275970Scy ifp->if_oerrors++; 216275970Scy m_freem(m); 217275970Scy ieee80211_free_node(ni); 218275970Scy continue; 219275970Scy } 220275970Scy if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 221275970Scy (m->m_flags & M_PWR_SAV) == 0) { 222275970Scy /* 223275970Scy * Station in power save mode; pass the frame 224275970Scy * to the 802.11 layer and continue. We'll get 225275970Scy * the frame back when the time is right. 226275970Scy * XXX lose WDS vap linkage? 227275970Scy */ 228275970Scy (void) ieee80211_pwrsave(ni, m); 229275970Scy ieee80211_free_node(ni); 230275970Scy continue; 231275970Scy } 232275970Scy /* calculate priority so drivers can find the tx queue */ 233275970Scy if (ieee80211_classify(ni, m)) { 234275970Scy IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 235275970Scy eh->ether_dhost, NULL, 236275970Scy "%s", "classification failure"); 237275970Scy vap->iv_stats.is_tx_classify++; 238275970Scy ifp->if_oerrors++; 239275970Scy m_freem(m); 240275970Scy ieee80211_free_node(ni); 241275970Scy continue; 242275970Scy } 243275970Scy 244275970Scy BPF_MTAP(ifp, m); /* 802.11 tx path */ 245275970Scy 246275970Scy /* 247275970Scy * XXX When ni is associated with a WDS link then 248275970Scy * the vap will be the WDS vap but ni_vap will point 249275970Scy * to the ap vap the station associated to. Once 250275970Scy * we handoff the packet to the driver the callback 251275970Scy * to ieee80211_encap won't be able to tell if the 252275970Scy * packet should be encapsulated for WDS or not (e.g. 253275970Scy * multicast frames will not be handled correctly). 254275970Scy * We hack this by marking the mbuf so ieee80211_encap 255275970Scy * can do the right thing. 256275970Scy */ 257275970Scy if (vap->iv_opmode == IEEE80211_M_WDS) 258275970Scy m->m_flags |= M_WDS; 259275970Scy else 260275970Scy m->m_flags &= ~M_WDS; 261275970Scy 262275970Scy /* 263275970Scy * Stash the node pointer and hand the frame off to 264275970Scy * the underlying device. Note that we do this after 265275970Scy * any call to ieee80211_dwds_mcast because that code 266275970Scy * uses any existing value for rcvif. 267275970Scy */ 268275970Scy m->m_pkthdr.rcvif = (void *)ni; 269275970Scy 270275970Scy /* XXX defer if_start calls? */ 271275970Scy error = parent->if_transmit(parent, m); 272275970Scy if (error != 0) { 273275970Scy /* NB: IFQ_HANDOFF reclaims mbuf */ 274275970Scy ieee80211_free_node(ni); 275275970Scy } else { 276275970Scy ifp->if_opackets++; 277275970Scy } 278275970Scy ic->ic_lastdata = ticks; 279275970Scy } 280275970Scy#undef IS_DWDS 281275970Scy} 282275970Scy 283275970Scy/* 284275970Scy * 802.11 output routine. This is (currently) used only to 285275970Scy * connect bpf write calls to the 802.11 layer for injecting 286275970Scy * raw 802.11 frames. Note we locate the ieee80211com from 287275970Scy * the ifnet using a spare field setup at attach time. This 288275970Scy * will go away when the virtual ap support comes in. 289275970Scy */ 290275970Scyint 291275970Scyieee80211_output(struct ifnet *ifp, struct mbuf *m, 292275970Scy struct sockaddr *dst, struct rtentry *rt0) 293275970Scy{ 294275970Scy#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 */ 734struct 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, 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 (__predict_true((m->m_flags & M_FF) == 0)) { 939 /* 940 * Normal frame. 941 */ 942 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 943 if (m == NULL) { 944 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 945 goto bad; 946 } 947 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 948 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 949 llc = mtod(m, struct llc *); 950 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 951 llc->llc_control = LLC_UI; 952 llc->llc_snap.org_code[0] = 0; 953 llc->llc_snap.org_code[1] = 0; 954 llc->llc_snap.org_code[2] = 0; 955 llc->llc_snap.ether_type = eh.ether_type; 956 } else { 957#ifdef IEEE80211_SUPPORT_SUPERG 958 m = ieee80211_ff_encap(vap, m, hdrspace, key); 959 if (m == NULL) 960#endif 961 goto bad; 962 } 963 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 964 965 M_PREPEND(m, hdrspace, M_DONTWAIT); 966 if (m == NULL) { 967 vap->iv_stats.is_tx_nobuf++; 968 goto bad; 969 } 970 wh = mtod(m, struct ieee80211_frame *); 971 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 972 *(uint16_t *)wh->i_dur = 0; 973 if (is4addr) { 974 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 975 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 976 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 977 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 978 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 979 } else switch (vap->iv_opmode) { 980 case IEEE80211_M_STA: 981 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 982 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 983 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 984 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 985 break; 986 case IEEE80211_M_IBSS: 987 case IEEE80211_M_AHDEMO: 988 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 989 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 990 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 991 /* 992 * NB: always use the bssid from iv_bss as the 993 * neighbor's may be stale after an ibss merge 994 */ 995 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 996 break; 997 case IEEE80211_M_HOSTAP: 998 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 999 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1000 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1001 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1002 break; 1003 case IEEE80211_M_MONITOR: 1004 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1005 goto bad; 1006 } 1007 if (m->m_flags & M_MORE_DATA) 1008 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1009 if (addqos) { 1010 uint8_t *qos; 1011 int ac, tid; 1012 1013 if (is4addr) { 1014 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1015 } else 1016 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1017 ac = M_WME_GETAC(m); 1018 /* map from access class/queue to 11e header priorty value */ 1019 tid = WME_AC_TO_TID(ac); 1020 qos[0] = tid & IEEE80211_QOS_TID; 1021 /* 1022 * Check if A-MPDU tx aggregation is setup or if we 1023 * should try to enable it. The sta must be associated 1024 * with HT and A-MPDU enabled for use. When the policy 1025 * routine decides we should enable A-MPDU we issue an 1026 * ADDBA request and wait for a reply. The frame being 1027 * encapsulated will go out w/o using A-MPDU, or possibly 1028 * it might be collected by the driver and held/retransmit. 1029 * The default ic_ampdu_enable routine handles staggering 1030 * ADDBA requests in case the receiver NAK's us or we are 1031 * otherwise unable to establish a BA stream. 1032 */ 1033 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1034 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1035 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1036 1037 ieee80211_txampdu_count_packet(tap); 1038 if (IEEE80211_AMPDU_RUNNING(tap)) { 1039 /* 1040 * Operational, mark frame for aggregation. 1041 * 1042 * NB: We support only immediate BA's for 1043 * AMPDU which means we set the QoS control 1044 * field to "normal ack" (0) to get "implicit 1045 * block ack" behaviour. 1046 */ 1047 m->m_flags |= M_AMPDU_MPDU; 1048 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1049 ic->ic_ampdu_enable(ni, tap)) { 1050 /* 1051 * Not negotiated yet, request service. 1052 */ 1053 ieee80211_ampdu_request(ni, tap); 1054 } 1055 } 1056 /* XXX works even when BA marked above */ 1057 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1058 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1059 qos[1] = 0; 1060 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1061 1062 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1063 /* 1064 * NB: don't assign a sequence # to potential 1065 * aggregates; we expect this happens at the 1066 * point the frame comes off any aggregation q 1067 * as otherwise we may introduce holes in the 1068 * BA sequence space and/or make window accouting 1069 * more difficult. 1070 * 1071 * XXX may want to control this with a driver 1072 * capability; this may also change when we pull 1073 * aggregation up into net80211 1074 */ 1075 *(uint16_t *)wh->i_seq = 1076 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1077 ni->ni_txseqs[tid]++; 1078 } 1079 } else { 1080 *(uint16_t *)wh->i_seq = 1081 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1082 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1083 } 1084 /* check if xmit fragmentation is required */ 1085 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1086 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1087 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1088 (m->m_flags & M_FF) == 0); /* NB: don't fragment ff's */ 1089 if (key != NULL) { 1090 /* 1091 * IEEE 802.1X: send EAPOL frames always in the clear. 1092 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1093 */ 1094 if ((m->m_flags & M_EAPOL) == 0 || 1095 ((vap->iv_flags & IEEE80211_F_WPA) && 1096 (vap->iv_opmode == IEEE80211_M_STA ? 1097 !IEEE80211_KEY_UNDEFINED(key) : 1098 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1099 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1100 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1101 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1102 eh.ether_dhost, 1103 "%s", "enmic failed, discard frame"); 1104 vap->iv_stats.is_crypto_enmicfail++; 1105 goto bad; 1106 } 1107 } 1108 } 1109 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1110 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1111 goto bad; 1112 1113 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1114 1115 IEEE80211_NODE_STAT(ni, tx_data); 1116 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1117 IEEE80211_NODE_STAT(ni, tx_mcast); 1118 else 1119 IEEE80211_NODE_STAT(ni, tx_ucast); 1120 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1121 1122 /* XXX fragmented frames not handled */ 1123 if (bpf_peers_present(vap->iv_rawbpf)) 1124 bpf_mtap(vap->iv_rawbpf, m); 1125 1126 return m; 1127bad: 1128 if (m != NULL) 1129 m_freem(m); 1130 return NULL; 1131#undef WH4 1132} 1133 1134/* 1135 * Fragment the frame according to the specified mtu. 1136 * The size of the 802.11 header (w/o padding) is provided 1137 * so we don't need to recalculate it. We create a new 1138 * mbuf for each fragment and chain it through m_nextpkt; 1139 * we might be able to optimize this by reusing the original 1140 * packet's mbufs but that is significantly more complicated. 1141 */ 1142static int 1143ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1144 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1145{ 1146 struct ieee80211_frame *wh, *whf; 1147 struct mbuf *m, *prev, *next; 1148 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1149 1150 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1151 KASSERT(m0->m_pkthdr.len > mtu, 1152 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1153 1154 wh = mtod(m0, struct ieee80211_frame *); 1155 /* NB: mark the first frag; it will be propagated below */ 1156 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1157 totalhdrsize = hdrsize + ciphdrsize; 1158 fragno = 1; 1159 off = mtu - ciphdrsize; 1160 remainder = m0->m_pkthdr.len - off; 1161 prev = m0; 1162 do { 1163 fragsize = totalhdrsize + remainder; 1164 if (fragsize > mtu) 1165 fragsize = mtu; 1166 /* XXX fragsize can be >2048! */ 1167 KASSERT(fragsize < MCLBYTES, 1168 ("fragment size %u too big!", fragsize)); 1169 if (fragsize > MHLEN) 1170 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1171 else 1172 m = m_gethdr(M_DONTWAIT, MT_DATA); 1173 if (m == NULL) 1174 goto bad; 1175 /* leave room to prepend any cipher header */ 1176 m_align(m, fragsize - ciphdrsize); 1177 1178 /* 1179 * Form the header in the fragment. Note that since 1180 * we mark the first fragment with the MORE_FRAG bit 1181 * it automatically is propagated to each fragment; we 1182 * need only clear it on the last fragment (done below). 1183 */ 1184 whf = mtod(m, struct ieee80211_frame *); 1185 memcpy(whf, wh, hdrsize); 1186 *(uint16_t *)&whf->i_seq[0] |= htole16( 1187 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1188 IEEE80211_SEQ_FRAG_SHIFT); 1189 fragno++; 1190 1191 payload = fragsize - totalhdrsize; 1192 /* NB: destination is known to be contiguous */ 1193 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1194 m->m_len = hdrsize + payload; 1195 m->m_pkthdr.len = hdrsize + payload; 1196 m->m_flags |= M_FRAG; 1197 1198 /* chain up the fragment */ 1199 prev->m_nextpkt = m; 1200 prev = m; 1201 1202 /* deduct fragment just formed */ 1203 remainder -= payload; 1204 off += payload; 1205 } while (remainder != 0); 1206 1207 /* set the last fragment */ 1208 m->m_flags |= M_LASTFRAG; 1209 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1210 1211 /* strip first mbuf now that everything has been copied */ 1212 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1213 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1214 1215 vap->iv_stats.is_tx_fragframes++; 1216 vap->iv_stats.is_tx_frags += fragno-1; 1217 1218 return 1; 1219bad: 1220 /* reclaim fragments but leave original frame for caller to free */ 1221 for (m = m0->m_nextpkt; m != NULL; m = next) { 1222 next = m->m_nextpkt; 1223 m->m_nextpkt = NULL; /* XXX paranoid */ 1224 m_freem(m); 1225 } 1226 m0->m_nextpkt = NULL; 1227 return 0; 1228} 1229 1230/* 1231 * Add a supported rates element id to a frame. 1232 */ 1233static uint8_t * 1234ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1235{ 1236 int nrates; 1237 1238 *frm++ = IEEE80211_ELEMID_RATES; 1239 nrates = rs->rs_nrates; 1240 if (nrates > IEEE80211_RATE_SIZE) 1241 nrates = IEEE80211_RATE_SIZE; 1242 *frm++ = nrates; 1243 memcpy(frm, rs->rs_rates, nrates); 1244 return frm + nrates; 1245} 1246 1247/* 1248 * Add an extended supported rates element id to a frame. 1249 */ 1250static uint8_t * 1251ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1252{ 1253 /* 1254 * Add an extended supported rates element if operating in 11g mode. 1255 */ 1256 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1257 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1258 *frm++ = IEEE80211_ELEMID_XRATES; 1259 *frm++ = nrates; 1260 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1261 frm += nrates; 1262 } 1263 return frm; 1264} 1265 1266/* 1267 * Add an ssid element to a frame. 1268 */ 1269static uint8_t * 1270ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1271{ 1272 *frm++ = IEEE80211_ELEMID_SSID; 1273 *frm++ = len; 1274 memcpy(frm, ssid, len); 1275 return frm + len; 1276} 1277 1278/* 1279 * Add an erp element to a frame. 1280 */ 1281static uint8_t * 1282ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1283{ 1284 uint8_t erp; 1285 1286 *frm++ = IEEE80211_ELEMID_ERP; 1287 *frm++ = 1; 1288 erp = 0; 1289 if (ic->ic_nonerpsta != 0) 1290 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1291 if (ic->ic_flags & IEEE80211_F_USEPROT) 1292 erp |= IEEE80211_ERP_USE_PROTECTION; 1293 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1294 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1295 *frm++ = erp; 1296 return frm; 1297} 1298 1299/* 1300 * Add a CFParams element to a frame. 1301 */ 1302static uint8_t * 1303ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1304{ 1305#define ADDSHORT(frm, v) do { \ 1306 frm[0] = (v) & 0xff; \ 1307 frm[1] = (v) >> 8; \ 1308 frm += 2; \ 1309} while (0) 1310 *frm++ = IEEE80211_ELEMID_CFPARMS; 1311 *frm++ = 6; 1312 *frm++ = 0; /* CFP count */ 1313 *frm++ = 2; /* CFP period */ 1314 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1315 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1316 return frm; 1317#undef ADDSHORT 1318} 1319 1320static __inline uint8_t * 1321add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1322{ 1323 memcpy(frm, ie->ie_data, ie->ie_len); 1324 return frm + ie->ie_len; 1325} 1326 1327static __inline uint8_t * 1328add_ie(uint8_t *frm, const uint8_t *ie) 1329{ 1330 memcpy(frm, ie, 2 + ie[1]); 1331 return frm + 2 + ie[1]; 1332} 1333 1334#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1335/* 1336 * Add a WME information element to a frame. 1337 */ 1338static uint8_t * 1339ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1340{ 1341 static const struct ieee80211_wme_info info = { 1342 .wme_id = IEEE80211_ELEMID_VENDOR, 1343 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1344 .wme_oui = { WME_OUI_BYTES }, 1345 .wme_type = WME_OUI_TYPE, 1346 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1347 .wme_version = WME_VERSION, 1348 .wme_info = 0, 1349 }; 1350 memcpy(frm, &info, sizeof(info)); 1351 return frm + sizeof(info); 1352} 1353 1354/* 1355 * Add a WME parameters element to a frame. 1356 */ 1357static uint8_t * 1358ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1359{ 1360#define SM(_v, _f) (((_v) << _f##_S) & _f) 1361#define ADDSHORT(frm, v) do { \ 1362 frm[0] = (v) & 0xff; \ 1363 frm[1] = (v) >> 8; \ 1364 frm += 2; \ 1365} while (0) 1366 /* NB: this works 'cuz a param has an info at the front */ 1367 static const struct ieee80211_wme_info param = { 1368 .wme_id = IEEE80211_ELEMID_VENDOR, 1369 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1370 .wme_oui = { WME_OUI_BYTES }, 1371 .wme_type = WME_OUI_TYPE, 1372 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1373 .wme_version = WME_VERSION, 1374 }; 1375 int i; 1376 1377 memcpy(frm, ¶m, sizeof(param)); 1378 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1379 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1380 *frm++ = 0; /* reserved field */ 1381 for (i = 0; i < WME_NUM_AC; i++) { 1382 const struct wmeParams *ac = 1383 &wme->wme_bssChanParams.cap_wmeParams[i]; 1384 *frm++ = SM(i, WME_PARAM_ACI) 1385 | SM(ac->wmep_acm, WME_PARAM_ACM) 1386 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1387 ; 1388 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1389 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1390 ; 1391 ADDSHORT(frm, ac->wmep_txopLimit); 1392 } 1393 return frm; 1394#undef SM 1395#undef ADDSHORT 1396} 1397#undef WME_OUI_BYTES 1398 1399/* 1400 * Add an 11h Power Constraint element to a frame. 1401 */ 1402static uint8_t * 1403ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1404{ 1405 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1406 /* XXX per-vap tx power limit? */ 1407 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1408 1409 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1410 frm[1] = 1; 1411 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1412 return frm + 3; 1413} 1414 1415/* 1416 * Add an 11h Power Capability element to a frame. 1417 */ 1418static uint8_t * 1419ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1420{ 1421 frm[0] = IEEE80211_ELEMID_PWRCAP; 1422 frm[1] = 2; 1423 frm[2] = c->ic_minpower; 1424 frm[3] = c->ic_maxpower; 1425 return frm + 4; 1426} 1427 1428/* 1429 * Add an 11h Supported Channels element to a frame. 1430 */ 1431static uint8_t * 1432ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1433{ 1434 static const int ielen = 26; 1435 1436 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1437 frm[1] = ielen; 1438 /* XXX not correct */ 1439 memcpy(frm+2, ic->ic_chan_avail, ielen); 1440 return frm + 2 + ielen; 1441} 1442 1443/* 1444 * Add an 11h Channel Switch Announcement element to a frame. 1445 * Note that we use the per-vap CSA count to adjust the global 1446 * counter so we can use this routine to form probe response 1447 * frames and get the current count. 1448 */ 1449static uint8_t * 1450ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1451{ 1452 struct ieee80211com *ic = vap->iv_ic; 1453 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1454 1455 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1456 csa->csa_len = 3; 1457 csa->csa_mode = 1; /* XXX force quiet on channel */ 1458 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1459 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1460 return frm + sizeof(*csa); 1461} 1462 1463/* 1464 * Add an 11h country information element to a frame. 1465 */ 1466static uint8_t * 1467ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1468{ 1469 1470 if (ic->ic_countryie == NULL || 1471 ic->ic_countryie_chan != ic->ic_bsschan) { 1472 /* 1473 * Handle lazy construction of ie. This is done on 1474 * first use and after a channel change that requires 1475 * re-calculation. 1476 */ 1477 if (ic->ic_countryie != NULL) 1478 free(ic->ic_countryie, M_80211_NODE_IE); 1479 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1480 if (ic->ic_countryie == NULL) 1481 return frm; 1482 ic->ic_countryie_chan = ic->ic_bsschan; 1483 } 1484 return add_appie(frm, ic->ic_countryie); 1485} 1486 1487/* 1488 * Send a probe request frame with the specified ssid 1489 * and any optional information element data. 1490 */ 1491int 1492ieee80211_send_probereq(struct ieee80211_node *ni, 1493 const uint8_t sa[IEEE80211_ADDR_LEN], 1494 const uint8_t da[IEEE80211_ADDR_LEN], 1495 const uint8_t bssid[IEEE80211_ADDR_LEN], 1496 const uint8_t *ssid, size_t ssidlen) 1497{ 1498 struct ieee80211vap *vap = ni->ni_vap; 1499 struct ieee80211com *ic = ni->ni_ic; 1500 const struct ieee80211_txparam *tp; 1501 struct ieee80211_bpf_params params; 1502 struct ieee80211_frame *wh; 1503 const struct ieee80211_rateset *rs; 1504 struct mbuf *m; 1505 uint8_t *frm; 1506 1507 if (vap->iv_state == IEEE80211_S_CAC) { 1508 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1509 "block %s frame in CAC state", "probe request"); 1510 vap->iv_stats.is_tx_badstate++; 1511 return EIO; /* XXX */ 1512 } 1513 1514 /* 1515 * Hold a reference on the node so it doesn't go away until after 1516 * the xmit is complete all the way in the driver. On error we 1517 * will remove our reference. 1518 */ 1519 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1520 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1521 __func__, __LINE__, 1522 ni, ether_sprintf(ni->ni_macaddr), 1523 ieee80211_node_refcnt(ni)+1); 1524 ieee80211_ref_node(ni); 1525 1526 /* 1527 * prreq frame format 1528 * [tlv] ssid 1529 * [tlv] supported rates 1530 * [tlv] RSN (optional) 1531 * [tlv] extended supported rates 1532 * [tlv] WPA (optional) 1533 * [tlv] user-specified ie's 1534 */ 1535 m = ieee80211_getmgtframe(&frm, 1536 ic->ic_headroom + sizeof(struct ieee80211_frame), 1537 2 + IEEE80211_NWID_LEN 1538 + 2 + IEEE80211_RATE_SIZE 1539 + sizeof(struct ieee80211_ie_wpa) 1540 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1541 + sizeof(struct ieee80211_ie_wpa) 1542 + (vap->iv_appie_probereq != NULL ? 1543 vap->iv_appie_probereq->ie_len : 0) 1544 ); 1545 if (m == NULL) { 1546 vap->iv_stats.is_tx_nobuf++; 1547 ieee80211_free_node(ni); 1548 return ENOMEM; 1549 } 1550 1551 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1552 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1553 frm = ieee80211_add_rates(frm, rs); 1554 if (vap->iv_flags & IEEE80211_F_WPA2) { 1555 if (vap->iv_rsn_ie != NULL) 1556 frm = add_ie(frm, vap->iv_rsn_ie); 1557 /* XXX else complain? */ 1558 } 1559 frm = ieee80211_add_xrates(frm, rs); 1560 if (vap->iv_flags & IEEE80211_F_WPA1) { 1561 if (vap->iv_wpa_ie != NULL) 1562 frm = add_ie(frm, vap->iv_wpa_ie); 1563 /* XXX else complain? */ 1564 } 1565 if (vap->iv_appie_probereq != NULL) 1566 frm = add_appie(frm, vap->iv_appie_probereq); 1567 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1568 1569 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1570 ("leading space %zd", M_LEADINGSPACE(m))); 1571 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1572 if (m == NULL) { 1573 /* NB: cannot happen */ 1574 ieee80211_free_node(ni); 1575 return ENOMEM; 1576 } 1577 1578 wh = mtod(m, struct ieee80211_frame *); 1579 ieee80211_send_setup(ni, wh, 1580 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1581 IEEE80211_NONQOS_TID, sa, da, bssid); 1582 /* XXX power management? */ 1583 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1584 1585 M_WME_SETAC(m, WME_AC_BE); 1586 1587 IEEE80211_NODE_STAT(ni, tx_probereq); 1588 IEEE80211_NODE_STAT(ni, tx_mgmt); 1589 1590 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1591 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1592 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1593 ssidlen, ssid); 1594 1595 memset(¶ms, 0, sizeof(params)); 1596 params.ibp_pri = M_WME_GETAC(m); 1597 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1598 params.ibp_rate0 = tp->mgmtrate; 1599 if (IEEE80211_IS_MULTICAST(da)) { 1600 params.ibp_flags |= IEEE80211_BPF_NOACK; 1601 params.ibp_try0 = 1; 1602 } else 1603 params.ibp_try0 = tp->maxretry; 1604 params.ibp_power = ni->ni_txpower; 1605 return ic->ic_raw_xmit(ni, m, ¶ms); 1606} 1607 1608/* 1609 * Calculate capability information for mgt frames. 1610 */ 1611static uint16_t 1612getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1613{ 1614 struct ieee80211com *ic = vap->iv_ic; 1615 uint16_t capinfo; 1616 1617 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1618 1619 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1620 capinfo = IEEE80211_CAPINFO_ESS; 1621 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1622 capinfo = IEEE80211_CAPINFO_IBSS; 1623 else 1624 capinfo = 0; 1625 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1626 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1627 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1628 IEEE80211_IS_CHAN_2GHZ(chan)) 1629 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1630 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1631 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1632 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1633 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1634 return capinfo; 1635} 1636 1637/* 1638 * Send a management frame. The node is for the destination (or ic_bss 1639 * when in station mode). Nodes other than ic_bss have their reference 1640 * count bumped to reflect our use for an indeterminant time. 1641 */ 1642int 1643ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1644{ 1645#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1646#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1647 struct ieee80211vap *vap = ni->ni_vap; 1648 struct ieee80211com *ic = ni->ni_ic; 1649 struct ieee80211_node *bss = vap->iv_bss; 1650 struct ieee80211_bpf_params params; 1651 struct mbuf *m; 1652 uint8_t *frm; 1653 uint16_t capinfo; 1654 int has_challenge, is_shared_key, ret, status; 1655 1656 KASSERT(ni != NULL, ("null node")); 1657 1658 /* 1659 * Hold a reference on the node so it doesn't go away until after 1660 * the xmit is complete all the way in the driver. On error we 1661 * will remove our reference. 1662 */ 1663 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1664 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1665 __func__, __LINE__, 1666 ni, ether_sprintf(ni->ni_macaddr), 1667 ieee80211_node_refcnt(ni)+1); 1668 ieee80211_ref_node(ni); 1669 1670 memset(¶ms, 0, sizeof(params)); 1671 switch (type) { 1672 1673 case IEEE80211_FC0_SUBTYPE_AUTH: 1674 status = arg >> 16; 1675 arg &= 0xffff; 1676 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1677 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1678 ni->ni_challenge != NULL); 1679 1680 /* 1681 * Deduce whether we're doing open authentication or 1682 * shared key authentication. We do the latter if 1683 * we're in the middle of a shared key authentication 1684 * handshake or if we're initiating an authentication 1685 * request and configured to use shared key. 1686 */ 1687 is_shared_key = has_challenge || 1688 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1689 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1690 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1691 1692 m = ieee80211_getmgtframe(&frm, 1693 ic->ic_headroom + sizeof(struct ieee80211_frame), 1694 3 * sizeof(uint16_t) 1695 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1696 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1697 ); 1698 if (m == NULL) 1699 senderr(ENOMEM, is_tx_nobuf); 1700 1701 ((uint16_t *)frm)[0] = 1702 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1703 : htole16(IEEE80211_AUTH_ALG_OPEN); 1704 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1705 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1706 1707 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1708 ((uint16_t *)frm)[3] = 1709 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1710 IEEE80211_ELEMID_CHALLENGE); 1711 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1712 IEEE80211_CHALLENGE_LEN); 1713 m->m_pkthdr.len = m->m_len = 1714 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1715 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1716 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1717 "request encrypt frame (%s)", __func__); 1718 /* mark frame for encryption */ 1719 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1720 } 1721 } else 1722 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1723 1724 /* XXX not right for shared key */ 1725 if (status == IEEE80211_STATUS_SUCCESS) 1726 IEEE80211_NODE_STAT(ni, tx_auth); 1727 else 1728 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1729 1730 if (vap->iv_opmode == IEEE80211_M_STA) 1731 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1732 (void *) vap->iv_state); 1733 break; 1734 1735 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1736 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1737 "send station deauthenticate (reason %d)", arg); 1738 m = ieee80211_getmgtframe(&frm, 1739 ic->ic_headroom + sizeof(struct ieee80211_frame), 1740 sizeof(uint16_t)); 1741 if (m == NULL) 1742 senderr(ENOMEM, is_tx_nobuf); 1743 *(uint16_t *)frm = htole16(arg); /* reason */ 1744 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1745 1746 IEEE80211_NODE_STAT(ni, tx_deauth); 1747 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1748 1749 ieee80211_node_unauthorize(ni); /* port closed */ 1750 break; 1751 1752 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1753 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1754 /* 1755 * asreq frame format 1756 * [2] capability information 1757 * [2] listen interval 1758 * [6*] current AP address (reassoc only) 1759 * [tlv] ssid 1760 * [tlv] supported rates 1761 * [tlv] extended supported rates 1762 * [4] power capability (optional) 1763 * [28] supported channels (optional) 1764 * [tlv] HT capabilities 1765 * [tlv] WME (optional) 1766 * [tlv] Vendor OUI HT capabilities (optional) 1767 * [tlv] Atheros capabilities (if negotiated) 1768 * [tlv] AppIE's (optional) 1769 */ 1770 m = ieee80211_getmgtframe(&frm, 1771 ic->ic_headroom + sizeof(struct ieee80211_frame), 1772 sizeof(uint16_t) 1773 + sizeof(uint16_t) 1774 + IEEE80211_ADDR_LEN 1775 + 2 + IEEE80211_NWID_LEN 1776 + 2 + IEEE80211_RATE_SIZE 1777 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1778 + 4 1779 + 2 + 26 1780 + sizeof(struct ieee80211_wme_info) 1781 + sizeof(struct ieee80211_ie_htcap) 1782 + 4 + sizeof(struct ieee80211_ie_htcap) 1783#ifdef IEEE80211_SUPPORT_SUPERG 1784 + sizeof(struct ieee80211_ath_ie) 1785#endif 1786 + (vap->iv_appie_wpa != NULL ? 1787 vap->iv_appie_wpa->ie_len : 0) 1788 + (vap->iv_appie_assocreq != NULL ? 1789 vap->iv_appie_assocreq->ie_len : 0) 1790 ); 1791 if (m == NULL) 1792 senderr(ENOMEM, is_tx_nobuf); 1793 1794 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1795 ("wrong mode %u", vap->iv_opmode)); 1796 capinfo = IEEE80211_CAPINFO_ESS; 1797 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1798 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1799 /* 1800 * NB: Some 11a AP's reject the request when 1801 * short premable is set. 1802 */ 1803 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1804 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1805 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1806 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1807 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1808 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1809 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1810 (vap->iv_flags & IEEE80211_F_DOTH)) 1811 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1812 *(uint16_t *)frm = htole16(capinfo); 1813 frm += 2; 1814 1815 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1816 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1817 bss->ni_intval)); 1818 frm += 2; 1819 1820 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1821 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1822 frm += IEEE80211_ADDR_LEN; 1823 } 1824 1825 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1826 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1827 if (vap->iv_flags & IEEE80211_F_WPA2) { 1828 if (vap->iv_rsn_ie != NULL) 1829 frm = add_ie(frm, vap->iv_rsn_ie); 1830 /* XXX else complain? */ 1831 } 1832 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1833 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1834 frm = ieee80211_add_powercapability(frm, 1835 ic->ic_curchan); 1836 frm = ieee80211_add_supportedchannels(frm, ic); 1837 } 1838 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1839 ni->ni_ies.htcap_ie != NULL && 1840 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1841 frm = ieee80211_add_htcap(frm, ni); 1842 if (vap->iv_flags & IEEE80211_F_WPA1) { 1843 if (vap->iv_wpa_ie != NULL) 1844 frm = add_ie(frm, vap->iv_wpa_ie); 1845 /* XXX else complain */ 1846 } 1847 if ((ic->ic_flags & IEEE80211_F_WME) && 1848 ni->ni_ies.wme_ie != NULL) 1849 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1850 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1851 ni->ni_ies.htcap_ie != NULL && 1852 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1853 frm = ieee80211_add_htcap_vendor(frm, ni); 1854#ifdef IEEE80211_SUPPORT_SUPERG 1855 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1856 frm = ieee80211_add_ath(frm, 1857 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1858 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 1859 ni->ni_authmode != IEEE80211_AUTH_8021X && 1860 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 1861 vap->iv_def_txkey : 0x7fff); 1862#endif /* IEEE80211_SUPPORT_SUPERG */ 1863 if (vap->iv_appie_assocreq != NULL) 1864 frm = add_appie(frm, vap->iv_appie_assocreq); 1865 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1866 1867 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1868 (void *) vap->iv_state); 1869 break; 1870 1871 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1872 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1873 /* 1874 * asresp frame format 1875 * [2] capability information 1876 * [2] status 1877 * [2] association ID 1878 * [tlv] supported rates 1879 * [tlv] extended supported rates 1880 * [tlv] HT capabilities (standard, if STA enabled) 1881 * [tlv] HT information (standard, if STA enabled) 1882 * [tlv] WME (if configured and STA enabled) 1883 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1884 * [tlv] HT information (vendor OUI, if STA enabled) 1885 * [tlv] Atheros capabilities (if STA enabled) 1886 * [tlv] AppIE's (optional) 1887 */ 1888 m = ieee80211_getmgtframe(&frm, 1889 ic->ic_headroom + sizeof(struct ieee80211_frame), 1890 sizeof(uint16_t) 1891 + sizeof(uint16_t) 1892 + sizeof(uint16_t) 1893 + 2 + IEEE80211_RATE_SIZE 1894 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1895 + sizeof(struct ieee80211_ie_htcap) + 4 1896 + sizeof(struct ieee80211_ie_htinfo) + 4 1897 + sizeof(struct ieee80211_wme_param) 1898#ifdef IEEE80211_SUPPORT_SUPERG 1899 + sizeof(struct ieee80211_ath_ie) 1900#endif 1901 + (vap->iv_appie_assocresp != NULL ? 1902 vap->iv_appie_assocresp->ie_len : 0) 1903 ); 1904 if (m == NULL) 1905 senderr(ENOMEM, is_tx_nobuf); 1906 1907 capinfo = getcapinfo(vap, bss->ni_chan); 1908 *(uint16_t *)frm = htole16(capinfo); 1909 frm += 2; 1910 1911 *(uint16_t *)frm = htole16(arg); /* status */ 1912 frm += 2; 1913 1914 if (arg == IEEE80211_STATUS_SUCCESS) { 1915 *(uint16_t *)frm = htole16(ni->ni_associd); 1916 IEEE80211_NODE_STAT(ni, tx_assoc); 1917 } else 1918 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1919 frm += 2; 1920 1921 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1922 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1923 /* NB: respond according to what we received */ 1924 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1925 frm = ieee80211_add_htcap(frm, ni); 1926 frm = ieee80211_add_htinfo(frm, ni); 1927 } 1928 if ((vap->iv_flags & IEEE80211_F_WME) && 1929 ni->ni_ies.wme_ie != NULL) 1930 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1931 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1932 frm = ieee80211_add_htcap_vendor(frm, ni); 1933 frm = ieee80211_add_htinfo_vendor(frm, ni); 1934 } 1935#ifdef IEEE80211_SUPPORT_SUPERG 1936 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1937 frm = ieee80211_add_ath(frm, 1938 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1939 ni->ni_ath_defkeyix); 1940#endif /* IEEE80211_SUPPORT_SUPERG */ 1941 if (vap->iv_appie_assocresp != NULL) 1942 frm = add_appie(frm, vap->iv_appie_assocresp); 1943 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1944 break; 1945 1946 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1947 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1948 "send station disassociate (reason %d)", arg); 1949 m = ieee80211_getmgtframe(&frm, 1950 ic->ic_headroom + sizeof(struct ieee80211_frame), 1951 sizeof(uint16_t)); 1952 if (m == NULL) 1953 senderr(ENOMEM, is_tx_nobuf); 1954 *(uint16_t *)frm = htole16(arg); /* reason */ 1955 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1956 1957 IEEE80211_NODE_STAT(ni, tx_disassoc); 1958 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1959 break; 1960 1961 default: 1962 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1963 "invalid mgmt frame type %u", type); 1964 senderr(EINVAL, is_tx_unknownmgt); 1965 /* NOTREACHED */ 1966 } 1967 1968 /* NB: force non-ProbeResp frames to the highest queue */ 1969 params.ibp_pri = WME_AC_VO; 1970 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1971 /* NB: we know all frames are unicast */ 1972 params.ibp_try0 = bss->ni_txparms->maxretry; 1973 params.ibp_power = bss->ni_txpower; 1974 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1975bad: 1976 ieee80211_free_node(ni); 1977 return ret; 1978#undef senderr 1979#undef HTFLAGS 1980} 1981 1982/* 1983 * Return an mbuf with a probe response frame in it. 1984 * Space is left to prepend and 802.11 header at the 1985 * front but it's left to the caller to fill in. 1986 */ 1987struct mbuf * 1988ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 1989{ 1990 struct ieee80211vap *vap = bss->ni_vap; 1991 struct ieee80211com *ic = bss->ni_ic; 1992 const struct ieee80211_rateset *rs; 1993 struct mbuf *m; 1994 uint16_t capinfo; 1995 uint8_t *frm; 1996 1997 /* 1998 * probe response frame format 1999 * [8] time stamp 2000 * [2] beacon interval 2001 * [2] cabability information 2002 * [tlv] ssid 2003 * [tlv] supported rates 2004 * [tlv] parameter set (FH/DS) 2005 * [tlv] parameter set (IBSS) 2006 * [tlv] country (optional) 2007 * [3] power control (optional) 2008 * [5] channel switch announcement (CSA) (optional) 2009 * [tlv] extended rate phy (ERP) 2010 * [tlv] extended supported rates 2011 * [tlv] RSN (optional) 2012 * [tlv] HT capabilities 2013 * [tlv] HT information 2014 * [tlv] WPA (optional) 2015 * [tlv] WME (optional) 2016 * [tlv] Vendor OUI HT capabilities (optional) 2017 * [tlv] Vendor OUI HT information (optional) 2018 * [tlv] Atheros capabilities 2019 * [tlv] AppIE's (optional) 2020 */ 2021 m = ieee80211_getmgtframe(&frm, 2022 ic->ic_headroom + sizeof(struct ieee80211_frame), 2023 8 2024 + sizeof(uint16_t) 2025 + sizeof(uint16_t) 2026 + 2 + IEEE80211_NWID_LEN 2027 + 2 + IEEE80211_RATE_SIZE 2028 + 7 /* max(7,3) */ 2029 + IEEE80211_COUNTRY_MAX_SIZE 2030 + 3 2031 + sizeof(struct ieee80211_csa_ie) 2032 + 3 2033 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2034 + sizeof(struct ieee80211_ie_wpa) 2035 + sizeof(struct ieee80211_ie_htcap) 2036 + sizeof(struct ieee80211_ie_htinfo) 2037 + sizeof(struct ieee80211_ie_wpa) 2038 + sizeof(struct ieee80211_wme_param) 2039 + 4 + sizeof(struct ieee80211_ie_htcap) 2040 + 4 + sizeof(struct ieee80211_ie_htinfo) 2041#ifdef IEEE80211_SUPPORT_SUPERG 2042 + sizeof(struct ieee80211_ath_ie) 2043#endif 2044 + (vap->iv_appie_proberesp != NULL ? 2045 vap->iv_appie_proberesp->ie_len : 0) 2046 ); 2047 if (m == NULL) { 2048 vap->iv_stats.is_tx_nobuf++; 2049 return NULL; 2050 } 2051 2052 memset(frm, 0, 8); /* timestamp should be filled later */ 2053 frm += 8; 2054 *(uint16_t *)frm = htole16(bss->ni_intval); 2055 frm += 2; 2056 capinfo = getcapinfo(vap, bss->ni_chan); 2057 *(uint16_t *)frm = htole16(capinfo); 2058 frm += 2; 2059 2060 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2061 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2062 frm = ieee80211_add_rates(frm, rs); 2063 2064 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2065 *frm++ = IEEE80211_ELEMID_FHPARMS; 2066 *frm++ = 5; 2067 *frm++ = bss->ni_fhdwell & 0x00ff; 2068 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2069 *frm++ = IEEE80211_FH_CHANSET( 2070 ieee80211_chan2ieee(ic, bss->ni_chan)); 2071 *frm++ = IEEE80211_FH_CHANPAT( 2072 ieee80211_chan2ieee(ic, bss->ni_chan)); 2073 *frm++ = bss->ni_fhindex; 2074 } else { 2075 *frm++ = IEEE80211_ELEMID_DSPARMS; 2076 *frm++ = 1; 2077 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2078 } 2079 2080 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2081 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2082 *frm++ = 2; 2083 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2084 } 2085 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2086 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2087 frm = ieee80211_add_countryie(frm, ic); 2088 if (vap->iv_flags & IEEE80211_F_DOTH) { 2089 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2090 frm = ieee80211_add_powerconstraint(frm, vap); 2091 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2092 frm = ieee80211_add_csa(frm, vap); 2093 } 2094 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2095 frm = ieee80211_add_erp(frm, ic); 2096 frm = ieee80211_add_xrates(frm, rs); 2097 if (vap->iv_flags & IEEE80211_F_WPA2) { 2098 if (vap->iv_rsn_ie != NULL) 2099 frm = add_ie(frm, vap->iv_rsn_ie); 2100 /* XXX else complain? */ 2101 } 2102 /* 2103 * NB: legacy 11b clients do not get certain ie's. 2104 * The caller identifies such clients by passing 2105 * a token in legacy to us. Could expand this to be 2106 * any legacy client for stuff like HT ie's. 2107 */ 2108 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2109 legacy != IEEE80211_SEND_LEGACY_11B) { 2110 frm = ieee80211_add_htcap(frm, bss); 2111 frm = ieee80211_add_htinfo(frm, bss); 2112 } 2113 if (vap->iv_flags & IEEE80211_F_WPA1) { 2114 if (vap->iv_wpa_ie != NULL) 2115 frm = add_ie(frm, vap->iv_wpa_ie); 2116 /* XXX else complain? */ 2117 } 2118 if (vap->iv_flags & IEEE80211_F_WME) 2119 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2120 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2121 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2122 legacy != IEEE80211_SEND_LEGACY_11B) { 2123 frm = ieee80211_add_htcap_vendor(frm, bss); 2124 frm = ieee80211_add_htinfo_vendor(frm, bss); 2125 } 2126#ifdef IEEE80211_SUPPORT_SUPERG 2127 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2128 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2129 bss->ni_ath_defkeyix); 2130#endif 2131 if (vap->iv_appie_proberesp != NULL) 2132 frm = add_appie(frm, vap->iv_appie_proberesp); 2133 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2134 2135 return m; 2136} 2137 2138/* 2139 * Send a probe response frame to the specified mac address. 2140 * This does not go through the normal mgt frame api so we 2141 * can specify the destination address and re-use the bss node 2142 * for the sta reference. 2143 */ 2144int 2145ieee80211_send_proberesp(struct ieee80211vap *vap, 2146 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2147{ 2148 struct ieee80211_node *bss = vap->iv_bss; 2149 struct ieee80211com *ic = vap->iv_ic; 2150 struct ieee80211_frame *wh; 2151 struct mbuf *m; 2152 2153 if (vap->iv_state == IEEE80211_S_CAC) { 2154 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2155 "block %s frame in CAC state", "probe response"); 2156 vap->iv_stats.is_tx_badstate++; 2157 return EIO; /* XXX */ 2158 } 2159 2160 /* 2161 * Hold a reference on the node so it doesn't go away until after 2162 * the xmit is complete all the way in the driver. On error we 2163 * will remove our reference. 2164 */ 2165 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2166 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2167 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2168 ieee80211_node_refcnt(bss)+1); 2169 ieee80211_ref_node(bss); 2170 2171 m = ieee80211_alloc_proberesp(bss, legacy); 2172 if (m == NULL) { 2173 ieee80211_free_node(bss); 2174 return ENOMEM; 2175 } 2176 2177 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2178 KASSERT(m != NULL, ("no room for header")); 2179 2180 wh = mtod(m, struct ieee80211_frame *); 2181 ieee80211_send_setup(bss, wh, 2182 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2183 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2184 /* XXX power management? */ 2185 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2186 2187 M_WME_SETAC(m, WME_AC_BE); 2188 2189 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2190 "send probe resp on channel %u to %s%s\n", 2191 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2192 legacy ? " <legacy>" : ""); 2193 IEEE80211_NODE_STAT(bss, tx_mgmt); 2194 2195 return ic->ic_raw_xmit(bss, m, NULL); 2196} 2197 2198/* 2199 * Allocate and build a RTS (Request To Send) control frame. 2200 */ 2201struct mbuf * 2202ieee80211_alloc_rts(struct ieee80211com *ic, 2203 const uint8_t ra[IEEE80211_ADDR_LEN], 2204 const uint8_t ta[IEEE80211_ADDR_LEN], 2205 uint16_t dur) 2206{ 2207 struct ieee80211_frame_rts *rts; 2208 struct mbuf *m; 2209 2210 /* XXX honor ic_headroom */ 2211 m = m_gethdr(M_DONTWAIT, MT_DATA); 2212 if (m != NULL) { 2213 rts = mtod(m, struct ieee80211_frame_rts *); 2214 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2215 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2216 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2217 *(u_int16_t *)rts->i_dur = htole16(dur); 2218 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2219 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2220 2221 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2222 } 2223 return m; 2224} 2225 2226/* 2227 * Allocate and build a CTS (Clear To Send) control frame. 2228 */ 2229struct mbuf * 2230ieee80211_alloc_cts(struct ieee80211com *ic, 2231 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2232{ 2233 struct ieee80211_frame_cts *cts; 2234 struct mbuf *m; 2235 2236 /* XXX honor ic_headroom */ 2237 m = m_gethdr(M_DONTWAIT, MT_DATA); 2238 if (m != NULL) { 2239 cts = mtod(m, struct ieee80211_frame_cts *); 2240 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2241 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2242 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2243 *(u_int16_t *)cts->i_dur = htole16(dur); 2244 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2245 2246 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2247 } 2248 return m; 2249} 2250 2251static void 2252ieee80211_tx_mgt_timeout(void *arg) 2253{ 2254 struct ieee80211_node *ni = arg; 2255 struct ieee80211vap *vap = ni->ni_vap; 2256 2257 if (vap->iv_state != IEEE80211_S_INIT && 2258 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2259 /* 2260 * NB: it's safe to specify a timeout as the reason here; 2261 * it'll only be used in the right state. 2262 */ 2263 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2264 IEEE80211_SCAN_FAIL_TIMEOUT); 2265 } 2266} 2267 2268static void 2269ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2270{ 2271 struct ieee80211vap *vap = ni->ni_vap; 2272 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2273 2274 /* 2275 * Frame transmit completed; arrange timer callback. If 2276 * transmit was successfuly we wait for response. Otherwise 2277 * we arrange an immediate callback instead of doing the 2278 * callback directly since we don't know what state the driver 2279 * is in (e.g. what locks it is holding). This work should 2280 * not be too time-critical and not happen too often so the 2281 * added overhead is acceptable. 2282 * 2283 * XXX what happens if !acked but response shows up before callback? 2284 */ 2285 if (vap->iv_state == ostate) 2286 callout_reset(&vap->iv_mgtsend, 2287 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2288 ieee80211_tx_mgt_timeout, ni); 2289} 2290 2291static void 2292ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2293 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2294{ 2295 struct ieee80211vap *vap = ni->ni_vap; 2296 struct ieee80211com *ic = ni->ni_ic; 2297 struct ieee80211_rateset *rs = &ni->ni_rates; 2298 uint16_t capinfo; 2299 2300 /* 2301 * beacon frame format 2302 * [8] time stamp 2303 * [2] beacon interval 2304 * [2] cabability information 2305 * [tlv] ssid 2306 * [tlv] supported rates 2307 * [3] parameter set (DS) 2308 * [8] CF parameter set (optional) 2309 * [tlv] parameter set (IBSS/TIM) 2310 * [tlv] country (optional) 2311 * [3] power control (optional) 2312 * [5] channel switch announcement (CSA) (optional) 2313 * [tlv] extended rate phy (ERP) 2314 * [tlv] extended supported rates 2315 * [tlv] RSN parameters 2316 * [tlv] HT capabilities 2317 * [tlv] HT information 2318 * XXX Vendor-specific OIDs (e.g. Atheros) 2319 * [tlv] WPA parameters 2320 * [tlv] WME parameters 2321 * [tlv] Vendor OUI HT capabilities (optional) 2322 * [tlv] Vendor OUI HT information (optional) 2323 * [tlv] TDMA parameters (optional) 2324 * [tlv] application data (optional) 2325 */ 2326 2327 memset(bo, 0, sizeof(*bo)); 2328 2329 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2330 frm += 8; 2331 *(uint16_t *)frm = htole16(ni->ni_intval); 2332 frm += 2; 2333 capinfo = getcapinfo(vap, ni->ni_chan); 2334 bo->bo_caps = (uint16_t *)frm; 2335 *(uint16_t *)frm = htole16(capinfo); 2336 frm += 2; 2337 *frm++ = IEEE80211_ELEMID_SSID; 2338 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2339 *frm++ = ni->ni_esslen; 2340 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2341 frm += ni->ni_esslen; 2342 } else 2343 *frm++ = 0; 2344 frm = ieee80211_add_rates(frm, rs); 2345 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2346 *frm++ = IEEE80211_ELEMID_DSPARMS; 2347 *frm++ = 1; 2348 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2349 } 2350 if (ic->ic_flags & IEEE80211_F_PCF) { 2351 bo->bo_cfp = frm; 2352 frm = ieee80211_add_cfparms(frm, ic); 2353 } 2354 bo->bo_tim = frm; 2355 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2356 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2357 *frm++ = 2; 2358 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2359 bo->bo_tim_len = 0; 2360 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2361 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2362 2363 tie->tim_ie = IEEE80211_ELEMID_TIM; 2364 tie->tim_len = 4; /* length */ 2365 tie->tim_count = 0; /* DTIM count */ 2366 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2367 tie->tim_bitctl = 0; /* bitmap control */ 2368 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2369 frm += sizeof(struct ieee80211_tim_ie); 2370 bo->bo_tim_len = 1; 2371 } 2372 bo->bo_tim_trailer = frm; 2373 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2374 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2375 frm = ieee80211_add_countryie(frm, ic); 2376 if (vap->iv_flags & IEEE80211_F_DOTH) { 2377 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2378 frm = ieee80211_add_powerconstraint(frm, vap); 2379 bo->bo_csa = frm; 2380 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2381 frm = ieee80211_add_csa(frm, vap); 2382 } else 2383 bo->bo_csa = frm; 2384 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2385 bo->bo_erp = frm; 2386 frm = ieee80211_add_erp(frm, ic); 2387 } 2388 frm = ieee80211_add_xrates(frm, rs); 2389 if (vap->iv_flags & IEEE80211_F_WPA2) { 2390 if (vap->iv_rsn_ie != NULL) 2391 frm = add_ie(frm, vap->iv_rsn_ie); 2392 /* XXX else complain */ 2393 } 2394 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2395 frm = ieee80211_add_htcap(frm, ni); 2396 bo->bo_htinfo = frm; 2397 frm = ieee80211_add_htinfo(frm, ni); 2398 } 2399 if (vap->iv_flags & IEEE80211_F_WPA1) { 2400 if (vap->iv_wpa_ie != NULL) 2401 frm = add_ie(frm, vap->iv_wpa_ie); 2402 /* XXX else complain */ 2403 } 2404 if (vap->iv_flags & IEEE80211_F_WME) { 2405 bo->bo_wme = frm; 2406 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2407 } 2408 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2409 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2410 frm = ieee80211_add_htcap_vendor(frm, ni); 2411 frm = ieee80211_add_htinfo_vendor(frm, ni); 2412 } 2413#ifdef IEEE80211_SUPPORT_TDMA 2414 if (vap->iv_caps & IEEE80211_C_TDMA) { 2415 bo->bo_tdma = frm; 2416 frm = ieee80211_add_tdma(frm, vap); 2417 } 2418#endif 2419 if (vap->iv_appie_beacon != NULL) { 2420 bo->bo_appie = frm; 2421 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2422 frm = add_appie(frm, vap->iv_appie_beacon); 2423 } 2424 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2425 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2426 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2427} 2428 2429/* 2430 * Allocate a beacon frame and fillin the appropriate bits. 2431 */ 2432struct mbuf * 2433ieee80211_beacon_alloc(struct ieee80211_node *ni, 2434 struct ieee80211_beacon_offsets *bo) 2435{ 2436 struct ieee80211vap *vap = ni->ni_vap; 2437 struct ieee80211com *ic = ni->ni_ic; 2438 struct ifnet *ifp = vap->iv_ifp; 2439 struct ieee80211_frame *wh; 2440 struct mbuf *m; 2441 int pktlen; 2442 uint8_t *frm; 2443 2444 /* 2445 * beacon frame format 2446 * [8] time stamp 2447 * [2] beacon interval 2448 * [2] cabability information 2449 * [tlv] ssid 2450 * [tlv] supported rates 2451 * [3] parameter set (DS) 2452 * [8] CF parameter set (optional) 2453 * [tlv] parameter set (IBSS/TIM) 2454 * [tlv] country (optional) 2455 * [3] power control (optional) 2456 * [5] channel switch announcement (CSA) (optional) 2457 * [tlv] extended rate phy (ERP) 2458 * [tlv] extended supported rates 2459 * [tlv] RSN parameters 2460 * [tlv] HT capabilities 2461 * [tlv] HT information 2462 * [tlv] Vendor OUI HT capabilities (optional) 2463 * [tlv] Vendor OUI HT information (optional) 2464 * XXX Vendor-specific OIDs (e.g. Atheros) 2465 * [tlv] WPA parameters 2466 * [tlv] WME parameters 2467 * [tlv] TDMA parameters (optional) 2468 * [tlv] application data (optional) 2469 * NB: we allocate the max space required for the TIM bitmap. 2470 * XXX how big is this? 2471 */ 2472 pktlen = 8 /* time stamp */ 2473 + sizeof(uint16_t) /* beacon interval */ 2474 + sizeof(uint16_t) /* capabilities */ 2475 + 2 + ni->ni_esslen /* ssid */ 2476 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2477 + 2 + 1 /* DS parameters */ 2478 + 2 + 6 /* CF parameters */ 2479 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2480 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2481 + 2 + 1 /* power control */ 2482 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2483 + 2 + 1 /* ERP */ 2484 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2485 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2486 2*sizeof(struct ieee80211_ie_wpa) : 0) 2487 /* XXX conditional? */ 2488 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2489 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2490 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2491 sizeof(struct ieee80211_wme_param) : 0) 2492#ifdef IEEE80211_SUPPORT_TDMA 2493 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2494 sizeof(struct ieee80211_tdma_param) : 0) 2495#endif 2496 + IEEE80211_MAX_APPIE 2497 ; 2498 m = ieee80211_getmgtframe(&frm, 2499 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2500 if (m == NULL) { 2501 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2502 "%s: cannot get buf; size %u\n", __func__, pktlen); 2503 vap->iv_stats.is_tx_nobuf++; 2504 return NULL; 2505 } 2506 ieee80211_beacon_construct(m, frm, bo, ni); 2507 2508 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2509 KASSERT(m != NULL, ("no space for 802.11 header?")); 2510 wh = mtod(m, struct ieee80211_frame *); 2511 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2512 IEEE80211_FC0_SUBTYPE_BEACON; 2513 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2514 *(uint16_t *)wh->i_dur = 0; 2515 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2516 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2517 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2518 *(uint16_t *)wh->i_seq = 0; 2519 2520 return m; 2521} 2522 2523/* 2524 * Update the dynamic parts of a beacon frame based on the current state. 2525 */ 2526int 2527ieee80211_beacon_update(struct ieee80211_node *ni, 2528 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2529{ 2530 struct ieee80211vap *vap = ni->ni_vap; 2531 struct ieee80211com *ic = ni->ni_ic; 2532 int len_changed = 0; 2533 uint16_t capinfo; 2534 2535 IEEE80211_LOCK(ic); 2536 /* 2537 * Handle 11h channel change when we've reached the count. 2538 * We must recalculate the beacon frame contents to account 2539 * for the new channel. Note we do this only for the first 2540 * vap that reaches this point; subsequent vaps just update 2541 * their beacon state to reflect the recalculated channel. 2542 */ 2543 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2544 vap->iv_csa_count == ic->ic_csa_count) { 2545 vap->iv_csa_count = 0; 2546 /* 2547 * Effect channel change before reconstructing the beacon 2548 * frame contents as many places reference ni_chan. 2549 */ 2550 if (ic->ic_csa_newchan != NULL) 2551 ieee80211_csa_completeswitch(ic); 2552 /* 2553 * NB: ieee80211_beacon_construct clears all pending 2554 * updates in bo_flags so we don't need to explicitly 2555 * clear IEEE80211_BEACON_CSA. 2556 */ 2557 ieee80211_beacon_construct(m, 2558 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2559 2560 /* XXX do WME aggressive mode processing? */ 2561 IEEE80211_UNLOCK(ic); 2562 return 1; /* just assume length changed */ 2563 } 2564 2565 /* XXX faster to recalculate entirely or just changes? */ 2566 capinfo = getcapinfo(vap, ni->ni_chan); 2567 *bo->bo_caps = htole16(capinfo); 2568 2569 if (vap->iv_flags & IEEE80211_F_WME) { 2570 struct ieee80211_wme_state *wme = &ic->ic_wme; 2571 2572 /* 2573 * Check for agressive mode change. When there is 2574 * significant high priority traffic in the BSS 2575 * throttle back BE traffic by using conservative 2576 * parameters. Otherwise BE uses agressive params 2577 * to optimize performance of legacy/non-QoS traffic. 2578 */ 2579 if (wme->wme_flags & WME_F_AGGRMODE) { 2580 if (wme->wme_hipri_traffic > 2581 wme->wme_hipri_switch_thresh) { 2582 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2583 "%s: traffic %u, disable aggressive mode\n", 2584 __func__, wme->wme_hipri_traffic); 2585 wme->wme_flags &= ~WME_F_AGGRMODE; 2586 ieee80211_wme_updateparams_locked(vap); 2587 wme->wme_hipri_traffic = 2588 wme->wme_hipri_switch_hysteresis; 2589 } else 2590 wme->wme_hipri_traffic = 0; 2591 } else { 2592 if (wme->wme_hipri_traffic <= 2593 wme->wme_hipri_switch_thresh) { 2594 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2595 "%s: traffic %u, enable aggressive mode\n", 2596 __func__, wme->wme_hipri_traffic); 2597 wme->wme_flags |= WME_F_AGGRMODE; 2598 ieee80211_wme_updateparams_locked(vap); 2599 wme->wme_hipri_traffic = 0; 2600 } else 2601 wme->wme_hipri_traffic = 2602 wme->wme_hipri_switch_hysteresis; 2603 } 2604 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2605 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2606 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2607 } 2608 } 2609 2610 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2611 ieee80211_ht_update_beacon(vap, bo); 2612 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2613 } 2614#ifdef IEEE80211_SUPPORT_TDMA 2615 if (vap->iv_caps & IEEE80211_C_TDMA) { 2616 /* 2617 * NB: the beacon is potentially updated every TBTT. 2618 */ 2619 ieee80211_tdma_update_beacon(vap, bo); 2620 } 2621#endif 2622 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2623 struct ieee80211_tim_ie *tie = 2624 (struct ieee80211_tim_ie *) bo->bo_tim; 2625 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2626 u_int timlen, timoff, i; 2627 /* 2628 * ATIM/DTIM needs updating. If it fits in the 2629 * current space allocated then just copy in the 2630 * new bits. Otherwise we need to move any trailing 2631 * data to make room. Note that we know there is 2632 * contiguous space because ieee80211_beacon_allocate 2633 * insures there is space in the mbuf to write a 2634 * maximal-size virtual bitmap (based on iv_max_aid). 2635 */ 2636 /* 2637 * Calculate the bitmap size and offset, copy any 2638 * trailer out of the way, and then copy in the 2639 * new bitmap and update the information element. 2640 * Note that the tim bitmap must contain at least 2641 * one byte and any offset must be even. 2642 */ 2643 if (vap->iv_ps_pending != 0) { 2644 timoff = 128; /* impossibly large */ 2645 for (i = 0; i < vap->iv_tim_len; i++) 2646 if (vap->iv_tim_bitmap[i]) { 2647 timoff = i &~ 1; 2648 break; 2649 } 2650 KASSERT(timoff != 128, ("tim bitmap empty!")); 2651 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2652 if (vap->iv_tim_bitmap[i]) 2653 break; 2654 timlen = 1 + (i - timoff); 2655 } else { 2656 timoff = 0; 2657 timlen = 1; 2658 } 2659 if (timlen != bo->bo_tim_len) { 2660 /* copy up/down trailer */ 2661 int adjust = tie->tim_bitmap+timlen 2662 - bo->bo_tim_trailer; 2663 ovbcopy(bo->bo_tim_trailer, 2664 bo->bo_tim_trailer+adjust, 2665 bo->bo_tim_trailer_len); 2666 bo->bo_tim_trailer += adjust; 2667 bo->bo_erp += adjust; 2668 bo->bo_htinfo += adjust; 2669#ifdef IEEE80211_TDMA_SUPPORT 2670 bo->bo_tdma += adjust; 2671#endif 2672 bo->bo_appie += adjust; 2673 bo->bo_wme += adjust; 2674 bo->bo_csa += adjust; 2675 bo->bo_tim_len = timlen; 2676 2677 /* update information element */ 2678 tie->tim_len = 3 + timlen; 2679 tie->tim_bitctl = timoff; 2680 len_changed = 1; 2681 } 2682 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2683 bo->bo_tim_len); 2684 2685 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2686 2687 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2688 "%s: TIM updated, pending %u, off %u, len %u\n", 2689 __func__, vap->iv_ps_pending, timoff, timlen); 2690 } 2691 /* count down DTIM period */ 2692 if (tie->tim_count == 0) 2693 tie->tim_count = tie->tim_period - 1; 2694 else 2695 tie->tim_count--; 2696 /* update state for buffered multicast frames on DTIM */ 2697 if (mcast && tie->tim_count == 0) 2698 tie->tim_bitctl |= 1; 2699 else 2700 tie->tim_bitctl &= ~1; 2701 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2702 struct ieee80211_csa_ie *csa = 2703 (struct ieee80211_csa_ie *) bo->bo_csa; 2704 2705 /* 2706 * Insert or update CSA ie. If we're just starting 2707 * to count down to the channel switch then we need 2708 * to insert the CSA ie. Otherwise we just need to 2709 * drop the count. The actual change happens above 2710 * when the vap's count reaches the target count. 2711 */ 2712 if (vap->iv_csa_count == 0) { 2713 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2714 bo->bo_erp += sizeof(*csa); 2715 bo->bo_wme += sizeof(*csa); 2716#ifdef IEEE80211_TDMA_SUPPORT 2717 bo->bo_tdma += sizeof(*csa); 2718#endif 2719 bo->bo_appie += sizeof(*csa); 2720 bo->bo_csa_trailer_len += sizeof(*csa); 2721 bo->bo_tim_trailer_len += sizeof(*csa); 2722 m->m_len += sizeof(*csa); 2723 m->m_pkthdr.len += sizeof(*csa); 2724 2725 ieee80211_add_csa(bo->bo_csa, vap); 2726 } else 2727 csa->csa_count--; 2728 vap->iv_csa_count++; 2729 /* NB: don't clear IEEE80211_BEACON_CSA */ 2730 } 2731 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2732 /* 2733 * ERP element needs updating. 2734 */ 2735 (void) ieee80211_add_erp(bo->bo_erp, ic); 2736 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2737 } 2738 } 2739 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2740 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2741 int aielen; 2742 uint8_t *frm; 2743 2744 aielen = 0; 2745 if (aie != NULL) 2746 aielen += aie->ie_len; 2747 if (aielen != bo->bo_appie_len) { 2748 /* copy up/down trailer */ 2749 int adjust = aielen - bo->bo_appie_len; 2750 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2751 bo->bo_tim_trailer_len); 2752 bo->bo_tim_trailer += adjust; 2753 bo->bo_appie += adjust; 2754 bo->bo_appie_len = aielen; 2755 2756 len_changed = 1; 2757 } 2758 frm = bo->bo_appie; 2759 if (aie != NULL) 2760 frm = add_appie(frm, aie); 2761 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2762 } 2763 IEEE80211_UNLOCK(ic); 2764 2765 return len_changed; 2766} 2767