ieee80211_output.c revision 283994
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 283994 2015-06-04 17:54:41Z adrian $"); 29 30#include "opt_inet.h" 31#include "opt_inet6.h" 32#include "opt_wlan.h" 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/mbuf.h> 37#include <sys/kernel.h> 38#include <sys/endian.h> 39 40#include <sys/socket.h> 41 42#include <net/bpf.h> 43#include <net/ethernet.h> 44#include <net/if.h> 45#include <net/if_var.h> 46#include <net/if_llc.h> 47#include <net/if_media.h> 48#include <net/if_vlan_var.h> 49 50#include <net80211/ieee80211_var.h> 51#include <net80211/ieee80211_regdomain.h> 52#ifdef IEEE80211_SUPPORT_SUPERG 53#include <net80211/ieee80211_superg.h> 54#endif 55#ifdef IEEE80211_SUPPORT_TDMA 56#include <net80211/ieee80211_tdma.h> 57#endif 58#include <net80211/ieee80211_wds.h> 59#include <net80211/ieee80211_mesh.h> 60 61#if defined(INET) || defined(INET6) 62#include <netinet/in.h> 63#endif 64 65#ifdef INET 66#include <netinet/if_ether.h> 67#include <netinet/in_systm.h> 68#include <netinet/ip.h> 69#endif 70#ifdef INET6 71#include <netinet/ip6.h> 72#endif 73 74#include <security/mac/mac_framework.h> 75 76#define ETHER_HEADER_COPY(dst, src) \ 77 memcpy(dst, src, sizeof(struct ether_header)) 78 79/* unalligned little endian access */ 80#define LE_WRITE_2(p, v) do { \ 81 ((uint8_t *)(p))[0] = (v) & 0xff; \ 82 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 83} while (0) 84#define LE_WRITE_4(p, v) do { \ 85 ((uint8_t *)(p))[0] = (v) & 0xff; \ 86 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 87 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 88 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 89} while (0) 90 91static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 92 u_int hdrsize, u_int ciphdrsize, u_int mtu); 93static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 94 95#ifdef IEEE80211_DEBUG 96/* 97 * Decide if an outbound management frame should be 98 * printed when debugging is enabled. This filters some 99 * of the less interesting frames that come frequently 100 * (e.g. beacons). 101 */ 102static __inline int 103doprint(struct ieee80211vap *vap, int subtype) 104{ 105 switch (subtype) { 106 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 107 return (vap->iv_opmode == IEEE80211_M_IBSS); 108 } 109 return 1; 110} 111#endif 112 113/* 114 * Transmit a frame to the given destination on the given VAP. 115 * 116 * It's up to the caller to figure out the details of who this 117 * is going to and resolving the node. 118 * 119 * This routine takes care of queuing it for power save, 120 * A-MPDU state stuff, fast-frames state stuff, encapsulation 121 * if required, then passing it up to the driver layer. 122 * 123 * This routine (for now) consumes the mbuf and frees the node 124 * reference; it ideally will return a TX status which reflects 125 * whether the mbuf was consumed or not, so the caller can 126 * free the mbuf (if appropriate) and the node reference (again, 127 * if appropriate.) 128 */ 129int 130ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m, 131 struct ieee80211_node *ni) 132{ 133 struct ieee80211com *ic = vap->iv_ic; 134 struct ifnet *ifp = vap->iv_ifp; 135 int error, len, mcast; 136 137 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 138 (m->m_flags & M_PWR_SAV) == 0) { 139 /* 140 * Station in power save mode; pass the frame 141 * to the 802.11 layer and continue. We'll get 142 * the frame back when the time is right. 143 * XXX lose WDS vap linkage? 144 */ 145 if (ieee80211_pwrsave(ni, m) != 0) 146 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 147 ieee80211_free_node(ni); 148 149 /* 150 * We queued it fine, so tell the upper layer 151 * that we consumed it. 152 */ 153 return (0); 154 } 155 /* calculate priority so drivers can find the tx queue */ 156 if (ieee80211_classify(ni, m)) { 157 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 158 ni->ni_macaddr, NULL, 159 "%s", "classification failure"); 160 vap->iv_stats.is_tx_classify++; 161 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 162 m_freem(m); 163 ieee80211_free_node(ni); 164 165 /* XXX better status? */ 166 return (0); 167 } 168 /* 169 * Stash the node pointer. Note that we do this after 170 * any call to ieee80211_dwds_mcast because that code 171 * uses any existing value for rcvif to identify the 172 * interface it (might have been) received on. 173 */ 174 m->m_pkthdr.rcvif = (void *)ni; 175 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0; 176 len = m->m_pkthdr.len; 177 178 BPF_MTAP(ifp, m); /* 802.3 tx */ 179 180 /* 181 * Check if A-MPDU tx aggregation is setup or if we 182 * should try to enable it. The sta must be associated 183 * with HT and A-MPDU enabled for use. When the policy 184 * routine decides we should enable A-MPDU we issue an 185 * ADDBA request and wait for a reply. The frame being 186 * encapsulated will go out w/o using A-MPDU, or possibly 187 * it might be collected by the driver and held/retransmit. 188 * The default ic_ampdu_enable routine handles staggering 189 * ADDBA requests in case the receiver NAK's us or we are 190 * otherwise unable to establish a BA stream. 191 */ 192 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 193 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 194 (m->m_flags & M_EAPOL) == 0) { 195 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 196 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 197 198 ieee80211_txampdu_count_packet(tap); 199 if (IEEE80211_AMPDU_RUNNING(tap)) { 200 /* 201 * Operational, mark frame for aggregation. 202 * 203 * XXX do tx aggregation here 204 */ 205 m->m_flags |= M_AMPDU_MPDU; 206 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 207 ic->ic_ampdu_enable(ni, tap)) { 208 /* 209 * Not negotiated yet, request service. 210 */ 211 ieee80211_ampdu_request(ni, tap); 212 /* XXX hold frame for reply? */ 213 } 214 } 215 216#ifdef IEEE80211_SUPPORT_SUPERG 217 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 218 m = ieee80211_ff_check(ni, m); 219 if (m == NULL) { 220 /* NB: any ni ref held on stageq */ 221 return (0); 222 } 223 } 224#endif /* IEEE80211_SUPPORT_SUPERG */ 225 226 /* 227 * Grab the TX lock - serialise the TX process from this 228 * point (where TX state is being checked/modified) 229 * through to driver queue. 230 */ 231 IEEE80211_TX_LOCK(ic); 232 233 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 234 /* 235 * Encapsulate the packet in prep for transmission. 236 */ 237 m = ieee80211_encap(vap, ni, m); 238 if (m == NULL) { 239 /* NB: stat+msg handled in ieee80211_encap */ 240 IEEE80211_TX_UNLOCK(ic); 241 ieee80211_free_node(ni); 242 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 243 return (ENOBUFS); 244 } 245 } 246 error = ieee80211_parent_xmitpkt(ic, m); 247 248 /* 249 * Unlock at this point - no need to hold it across 250 * ieee80211_free_node() (ie, the comlock) 251 */ 252 IEEE80211_TX_UNLOCK(ic); 253 if (error != 0) { 254 /* NB: IFQ_HANDOFF reclaims mbuf */ 255 ieee80211_free_node(ni); 256 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 257 } else { 258 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 259 if_inc_counter(ifp, IFCOUNTER_OMCASTS, mcast); 260 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 261 } 262 ic->ic_lastdata = ticks; 263 264 return (0); 265} 266 267 268 269/* 270 * Send the given mbuf through the given vap. 271 * 272 * This consumes the mbuf regardless of whether the transmit 273 * was successful or not. 274 * 275 * This does none of the initial checks that ieee80211_start() 276 * does (eg CAC timeout, interface wakeup) - the caller must 277 * do this first. 278 */ 279static int 280ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 281{ 282#define IS_DWDS(vap) \ 283 (vap->iv_opmode == IEEE80211_M_WDS && \ 284 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 285 struct ieee80211com *ic = vap->iv_ic; 286 struct ifnet *ifp = vap->iv_ifp; 287 struct ieee80211_node *ni; 288 struct ether_header *eh; 289 290 /* 291 * Cancel any background scan. 292 */ 293 if (ic->ic_flags & IEEE80211_F_SCAN) 294 ieee80211_cancel_anyscan(vap); 295 /* 296 * Find the node for the destination so we can do 297 * things like power save and fast frames aggregation. 298 * 299 * NB: past this point various code assumes the first 300 * mbuf has the 802.3 header present (and contiguous). 301 */ 302 ni = NULL; 303 if (m->m_len < sizeof(struct ether_header) && 304 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 305 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 306 "discard frame, %s\n", "m_pullup failed"); 307 vap->iv_stats.is_tx_nobuf++; /* XXX */ 308 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 309 return (ENOBUFS); 310 } 311 eh = mtod(m, struct ether_header *); 312 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 313 if (IS_DWDS(vap)) { 314 /* 315 * Only unicast frames from the above go out 316 * DWDS vaps; multicast frames are handled by 317 * dispatching the frame as it comes through 318 * the AP vap (see below). 319 */ 320 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 321 eh->ether_dhost, "mcast", "%s", "on DWDS"); 322 vap->iv_stats.is_dwds_mcast++; 323 m_freem(m); 324 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 325 /* XXX better status? */ 326 return (ENOBUFS); 327 } 328 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 329 /* 330 * Spam DWDS vap's w/ multicast traffic. 331 */ 332 /* XXX only if dwds in use? */ 333 ieee80211_dwds_mcast(vap, m); 334 } 335 } 336#ifdef IEEE80211_SUPPORT_MESH 337 if (vap->iv_opmode != IEEE80211_M_MBSS) { 338#endif 339 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 340 if (ni == NULL) { 341 /* NB: ieee80211_find_txnode does stat+msg */ 342 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 343 m_freem(m); 344 /* XXX better status? */ 345 return (ENOBUFS); 346 } 347 if (ni->ni_associd == 0 && 348 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 349 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 350 eh->ether_dhost, NULL, 351 "sta not associated (type 0x%04x)", 352 htons(eh->ether_type)); 353 vap->iv_stats.is_tx_notassoc++; 354 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 355 m_freem(m); 356 ieee80211_free_node(ni); 357 /* XXX better status? */ 358 return (ENOBUFS); 359 } 360#ifdef IEEE80211_SUPPORT_MESH 361 } else { 362 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 363 /* 364 * Proxy station only if configured. 365 */ 366 if (!ieee80211_mesh_isproxyena(vap)) { 367 IEEE80211_DISCARD_MAC(vap, 368 IEEE80211_MSG_OUTPUT | 369 IEEE80211_MSG_MESH, 370 eh->ether_dhost, NULL, 371 "%s", "proxy not enabled"); 372 vap->iv_stats.is_mesh_notproxy++; 373 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 374 m_freem(m); 375 /* XXX better status? */ 376 return (ENOBUFS); 377 } 378 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 379 "forward frame from DS SA(%6D), DA(%6D)\n", 380 eh->ether_shost, ":", 381 eh->ether_dhost, ":"); 382 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 383 } 384 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 385 if (ni == NULL) { 386 /* 387 * NB: ieee80211_mesh_discover holds/disposes 388 * frame (e.g. queueing on path discovery). 389 */ 390 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 391 /* XXX better status? */ 392 return (ENOBUFS); 393 } 394 } 395#endif 396 397 /* 398 * We've resolved the sender, so attempt to transmit it. 399 */ 400 401 if (vap->iv_state == IEEE80211_S_SLEEP) { 402 /* 403 * In power save; queue frame and then wakeup device 404 * for transmit. 405 */ 406 ic->ic_lastdata = ticks; 407 if (ieee80211_pwrsave(ni, m) != 0) 408 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 409 ieee80211_free_node(ni); 410 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 411 return (0); 412 } 413 414 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0) 415 return (ENOBUFS); 416 return (0); 417#undef IS_DWDS 418} 419 420/* 421 * Start method for vap's. All packets from the stack come 422 * through here. We handle common processing of the packets 423 * before dispatching them to the underlying device. 424 * 425 * if_transmit() requires that the mbuf be consumed by this call 426 * regardless of the return condition. 427 */ 428int 429ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m) 430{ 431 struct ieee80211vap *vap = ifp->if_softc; 432 struct ieee80211com *ic = vap->iv_ic; 433 struct ifnet *parent = ic->ic_ifp; 434 435 /* NB: parent must be up and running */ 436 if (!IFNET_IS_UP_RUNNING(parent)) { 437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 438 "%s: ignore queue, parent %s not up+running\n", 439 __func__, parent->if_xname); 440 m_freem(m); 441 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 442 return (ENETDOWN); 443 } 444 445 /* 446 * No data frames go out unless we're running. 447 * Note in particular this covers CAC and CSA 448 * states (though maybe we should check muting 449 * for CSA). 450 */ 451 if (vap->iv_state != IEEE80211_S_RUN && 452 vap->iv_state != IEEE80211_S_SLEEP) { 453 IEEE80211_LOCK(ic); 454 /* re-check under the com lock to avoid races */ 455 if (vap->iv_state != IEEE80211_S_RUN && 456 vap->iv_state != IEEE80211_S_SLEEP) { 457 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 458 "%s: ignore queue, in %s state\n", 459 __func__, ieee80211_state_name[vap->iv_state]); 460 vap->iv_stats.is_tx_badstate++; 461 IEEE80211_UNLOCK(ic); 462 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 463 m_freem(m); 464 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 465 return (ENETDOWN); 466 } 467 IEEE80211_UNLOCK(ic); 468 } 469 470 /* 471 * Sanitize mbuf flags for net80211 use. We cannot 472 * clear M_PWR_SAV or M_MORE_DATA because these may 473 * be set for frames that are re-submitted from the 474 * power save queue. 475 * 476 * NB: This must be done before ieee80211_classify as 477 * it marks EAPOL in frames with M_EAPOL. 478 */ 479 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 480 481 /* 482 * Bump to the packet transmission path. 483 * The mbuf will be consumed here. 484 */ 485 return (ieee80211_start_pkt(vap, m)); 486} 487 488void 489ieee80211_vap_qflush(struct ifnet *ifp) 490{ 491 492 /* Empty for now */ 493} 494 495/* 496 * 802.11 raw output routine. 497 * 498 * XXX TODO: this (and other send routines) should correctly 499 * XXX keep the pwr mgmt bit set if it decides to call into the 500 * XXX driver to send a frame whilst the state is SLEEP. 501 * 502 * Otherwise the peer may decide that we're awake and flood us 503 * with traffic we are still too asleep to receive! 504 */ 505int 506ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 507 struct mbuf *m, const struct ieee80211_bpf_params *params) 508{ 509 struct ieee80211com *ic = vap->iv_ic; 510 511 /* 512 * Set node - the caller has taken a reference, so ensure 513 * that the mbuf has the same node value that 514 * it would if it were going via the normal path. 515 */ 516 m->m_pkthdr.rcvif = (void *)ni; 517 518 /* 519 * Attempt to add bpf transmit parameters. 520 * 521 * For now it's ok to fail; the raw_xmit api still takes 522 * them as an option. 523 * 524 * Later on when ic_raw_xmit() has params removed, 525 * they'll have to be added - so fail the transmit if 526 * they can't be. 527 */ 528 (void) ieee80211_add_xmit_params(m, params); 529 530 return (ic->ic_raw_xmit(ni, m, params)); 531} 532 533/* 534 * 802.11 output routine. This is (currently) used only to 535 * connect bpf write calls to the 802.11 layer for injecting 536 * raw 802.11 frames. 537 */ 538int 539ieee80211_output(struct ifnet *ifp, struct mbuf *m, 540 const struct sockaddr *dst, struct route *ro) 541{ 542#define senderr(e) do { error = (e); goto bad;} while (0) 543 struct ieee80211_node *ni = NULL; 544 struct ieee80211vap *vap; 545 struct ieee80211_frame *wh; 546 struct ieee80211com *ic = NULL; 547 int error; 548 int ret; 549 550 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 551 /* 552 * Short-circuit requests if the vap is marked OACTIVE 553 * as this can happen because a packet came down through 554 * ieee80211_start before the vap entered RUN state in 555 * which case it's ok to just drop the frame. This 556 * should not be necessary but callers of if_output don't 557 * check OACTIVE. 558 */ 559 senderr(ENETDOWN); 560 } 561 vap = ifp->if_softc; 562 ic = vap->iv_ic; 563 /* 564 * Hand to the 802.3 code if not tagged as 565 * a raw 802.11 frame. 566 */ 567 if (dst->sa_family != AF_IEEE80211) 568 return vap->iv_output(ifp, m, dst, ro); 569#ifdef MAC 570 error = mac_ifnet_check_transmit(ifp, m); 571 if (error) 572 senderr(error); 573#endif 574 if (ifp->if_flags & IFF_MONITOR) 575 senderr(ENETDOWN); 576 if (!IFNET_IS_UP_RUNNING(ifp)) 577 senderr(ENETDOWN); 578 if (vap->iv_state == IEEE80211_S_CAC) { 579 IEEE80211_DPRINTF(vap, 580 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 581 "block %s frame in CAC state\n", "raw data"); 582 vap->iv_stats.is_tx_badstate++; 583 senderr(EIO); /* XXX */ 584 } else if (vap->iv_state == IEEE80211_S_SCAN) 585 senderr(EIO); 586 /* XXX bypass bridge, pfil, carp, etc. */ 587 588 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 589 senderr(EIO); /* XXX */ 590 wh = mtod(m, struct ieee80211_frame *); 591 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 592 IEEE80211_FC0_VERSION_0) 593 senderr(EIO); /* XXX */ 594 595 /* locate destination node */ 596 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 597 case IEEE80211_FC1_DIR_NODS: 598 case IEEE80211_FC1_DIR_FROMDS: 599 ni = ieee80211_find_txnode(vap, wh->i_addr1); 600 break; 601 case IEEE80211_FC1_DIR_TODS: 602 case IEEE80211_FC1_DIR_DSTODS: 603 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 604 senderr(EIO); /* XXX */ 605 ni = ieee80211_find_txnode(vap, wh->i_addr3); 606 break; 607 default: 608 senderr(EIO); /* XXX */ 609 } 610 if (ni == NULL) { 611 /* 612 * Permit packets w/ bpf params through regardless 613 * (see below about sa_len). 614 */ 615 if (dst->sa_len == 0) 616 senderr(EHOSTUNREACH); 617 ni = ieee80211_ref_node(vap->iv_bss); 618 } 619 620 /* 621 * Sanitize mbuf for net80211 flags leaked from above. 622 * 623 * NB: This must be done before ieee80211_classify as 624 * it marks EAPOL in frames with M_EAPOL. 625 */ 626 m->m_flags &= ~M_80211_TX; 627 628 /* calculate priority so drivers can find the tx queue */ 629 /* XXX assumes an 802.3 frame */ 630 if (ieee80211_classify(ni, m)) 631 senderr(EIO); /* XXX */ 632 633 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 634 IEEE80211_NODE_STAT(ni, tx_data); 635 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 636 IEEE80211_NODE_STAT(ni, tx_mcast); 637 m->m_flags |= M_MCAST; 638 } else 639 IEEE80211_NODE_STAT(ni, tx_ucast); 640 /* NB: ieee80211_encap does not include 802.11 header */ 641 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 642 643 IEEE80211_TX_LOCK(ic); 644 645 /* 646 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 647 * present by setting the sa_len field of the sockaddr (yes, 648 * this is a hack). 649 * NB: we assume sa_data is suitably aligned to cast. 650 */ 651 ret = ieee80211_raw_output(vap, ni, m, 652 (const struct ieee80211_bpf_params *)(dst->sa_len ? 653 dst->sa_data : NULL)); 654 IEEE80211_TX_UNLOCK(ic); 655 return (ret); 656bad: 657 if (m != NULL) 658 m_freem(m); 659 if (ni != NULL) 660 ieee80211_free_node(ni); 661 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 662 return error; 663#undef senderr 664} 665 666/* 667 * Set the direction field and address fields of an outgoing 668 * frame. Note this should be called early on in constructing 669 * a frame as it sets i_fc[1]; other bits can then be or'd in. 670 */ 671void 672ieee80211_send_setup( 673 struct ieee80211_node *ni, 674 struct mbuf *m, 675 int type, int tid, 676 const uint8_t sa[IEEE80211_ADDR_LEN], 677 const uint8_t da[IEEE80211_ADDR_LEN], 678 const uint8_t bssid[IEEE80211_ADDR_LEN]) 679{ 680#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 681 struct ieee80211vap *vap = ni->ni_vap; 682 struct ieee80211_tx_ampdu *tap; 683 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 684 ieee80211_seq seqno; 685 686 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic); 687 688 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 689 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 690 switch (vap->iv_opmode) { 691 case IEEE80211_M_STA: 692 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 693 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 694 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 695 IEEE80211_ADDR_COPY(wh->i_addr3, da); 696 break; 697 case IEEE80211_M_IBSS: 698 case IEEE80211_M_AHDEMO: 699 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 700 IEEE80211_ADDR_COPY(wh->i_addr1, da); 701 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 702 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 703 break; 704 case IEEE80211_M_HOSTAP: 705 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 706 IEEE80211_ADDR_COPY(wh->i_addr1, da); 707 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 708 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 709 break; 710 case IEEE80211_M_WDS: 711 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 712 IEEE80211_ADDR_COPY(wh->i_addr1, da); 713 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 714 IEEE80211_ADDR_COPY(wh->i_addr3, da); 715 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 716 break; 717 case IEEE80211_M_MBSS: 718#ifdef IEEE80211_SUPPORT_MESH 719 if (IEEE80211_IS_MULTICAST(da)) { 720 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 721 /* XXX next hop */ 722 IEEE80211_ADDR_COPY(wh->i_addr1, da); 723 IEEE80211_ADDR_COPY(wh->i_addr2, 724 vap->iv_myaddr); 725 } else { 726 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 727 IEEE80211_ADDR_COPY(wh->i_addr1, da); 728 IEEE80211_ADDR_COPY(wh->i_addr2, 729 vap->iv_myaddr); 730 IEEE80211_ADDR_COPY(wh->i_addr3, da); 731 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 732 } 733#endif 734 break; 735 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 736 break; 737 } 738 } else { 739 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 740 IEEE80211_ADDR_COPY(wh->i_addr1, da); 741 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 742#ifdef IEEE80211_SUPPORT_MESH 743 if (vap->iv_opmode == IEEE80211_M_MBSS) 744 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 745 else 746#endif 747 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 748 } 749 *(uint16_t *)&wh->i_dur[0] = 0; 750 751 tap = &ni->ni_tx_ampdu[tid]; 752 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 753 m->m_flags |= M_AMPDU_MPDU; 754 else { 755 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK, 756 type & IEEE80211_FC0_SUBTYPE_MASK)) 757 seqno = ni->ni_txseqs[tid]++; 758 else 759 seqno = 0; 760 761 *(uint16_t *)&wh->i_seq[0] = 762 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 763 M_SEQNO_SET(m, seqno); 764 } 765 766 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 767 m->m_flags |= M_MCAST; 768#undef WH4 769} 770 771/* 772 * Send a management frame to the specified node. The node pointer 773 * must have a reference as the pointer will be passed to the driver 774 * and potentially held for a long time. If the frame is successfully 775 * dispatched to the driver, then it is responsible for freeing the 776 * reference (and potentially free'ing up any associated storage); 777 * otherwise deal with reclaiming any reference (on error). 778 */ 779int 780ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 781 struct ieee80211_bpf_params *params) 782{ 783 struct ieee80211vap *vap = ni->ni_vap; 784 struct ieee80211com *ic = ni->ni_ic; 785 struct ieee80211_frame *wh; 786 int ret; 787 788 KASSERT(ni != NULL, ("null node")); 789 790 if (vap->iv_state == IEEE80211_S_CAC) { 791 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 792 ni, "block %s frame in CAC state", 793 ieee80211_mgt_subtype_name[ 794 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 795 IEEE80211_FC0_SUBTYPE_SHIFT]); 796 vap->iv_stats.is_tx_badstate++; 797 ieee80211_free_node(ni); 798 m_freem(m); 799 return EIO; /* XXX */ 800 } 801 802 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 803 if (m == NULL) { 804 ieee80211_free_node(ni); 805 return ENOMEM; 806 } 807 808 IEEE80211_TX_LOCK(ic); 809 810 wh = mtod(m, struct ieee80211_frame *); 811 ieee80211_send_setup(ni, m, 812 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 813 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 814 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 815 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 816 "encrypting frame (%s)", __func__); 817 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 818 } 819 m->m_flags |= M_ENCAP; /* mark encapsulated */ 820 821 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 822 M_WME_SETAC(m, params->ibp_pri); 823 824#ifdef IEEE80211_DEBUG 825 /* avoid printing too many frames */ 826 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 827 ieee80211_msg_dumppkts(vap)) { 828 printf("[%s] send %s on channel %u\n", 829 ether_sprintf(wh->i_addr1), 830 ieee80211_mgt_subtype_name[ 831 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 832 IEEE80211_FC0_SUBTYPE_SHIFT], 833 ieee80211_chan2ieee(ic, ic->ic_curchan)); 834 } 835#endif 836 IEEE80211_NODE_STAT(ni, tx_mgmt); 837 838 ret = ieee80211_raw_output(vap, ni, m, params); 839 IEEE80211_TX_UNLOCK(ic); 840 return (ret); 841} 842 843/* 844 * Send a null data frame to the specified node. If the station 845 * is setup for QoS then a QoS Null Data frame is constructed. 846 * If this is a WDS station then a 4-address frame is constructed. 847 * 848 * NB: the caller is assumed to have setup a node reference 849 * for use; this is necessary to deal with a race condition 850 * when probing for inactive stations. Like ieee80211_mgmt_output 851 * we must cleanup any node reference on error; however we 852 * can safely just unref it as we know it will never be the 853 * last reference to the node. 854 */ 855int 856ieee80211_send_nulldata(struct ieee80211_node *ni) 857{ 858 struct ieee80211vap *vap = ni->ni_vap; 859 struct ieee80211com *ic = ni->ni_ic; 860 struct mbuf *m; 861 struct ieee80211_frame *wh; 862 int hdrlen; 863 uint8_t *frm; 864 int ret; 865 866 if (vap->iv_state == IEEE80211_S_CAC) { 867 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 868 ni, "block %s frame in CAC state", "null data"); 869 ieee80211_unref_node(&ni); 870 vap->iv_stats.is_tx_badstate++; 871 return EIO; /* XXX */ 872 } 873 874 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 875 hdrlen = sizeof(struct ieee80211_qosframe); 876 else 877 hdrlen = sizeof(struct ieee80211_frame); 878 /* NB: only WDS vap's get 4-address frames */ 879 if (vap->iv_opmode == IEEE80211_M_WDS) 880 hdrlen += IEEE80211_ADDR_LEN; 881 if (ic->ic_flags & IEEE80211_F_DATAPAD) 882 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 883 884 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 885 if (m == NULL) { 886 /* XXX debug msg */ 887 ieee80211_unref_node(&ni); 888 vap->iv_stats.is_tx_nobuf++; 889 return ENOMEM; 890 } 891 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 892 ("leading space %zd", M_LEADINGSPACE(m))); 893 M_PREPEND(m, hdrlen, M_NOWAIT); 894 if (m == NULL) { 895 /* NB: cannot happen */ 896 ieee80211_free_node(ni); 897 return ENOMEM; 898 } 899 900 IEEE80211_TX_LOCK(ic); 901 902 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 903 if (ni->ni_flags & IEEE80211_NODE_QOS) { 904 const int tid = WME_AC_TO_TID(WME_AC_BE); 905 uint8_t *qos; 906 907 ieee80211_send_setup(ni, m, 908 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 909 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 910 911 if (vap->iv_opmode == IEEE80211_M_WDS) 912 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 913 else 914 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 915 qos[0] = tid & IEEE80211_QOS_TID; 916 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 917 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 918 qos[1] = 0; 919 } else { 920 ieee80211_send_setup(ni, m, 921 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 922 IEEE80211_NONQOS_TID, 923 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 924 } 925 if (vap->iv_opmode != IEEE80211_M_WDS) { 926 /* NB: power management bit is never sent by an AP */ 927 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 928 vap->iv_opmode != IEEE80211_M_HOSTAP) 929 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 930 } 931 m->m_len = m->m_pkthdr.len = hdrlen; 932 m->m_flags |= M_ENCAP; /* mark encapsulated */ 933 934 M_WME_SETAC(m, WME_AC_BE); 935 936 IEEE80211_NODE_STAT(ni, tx_data); 937 938 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 939 "send %snull data frame on channel %u, pwr mgt %s", 940 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 941 ieee80211_chan2ieee(ic, ic->ic_curchan), 942 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 943 944 ret = ieee80211_raw_output(vap, ni, m, NULL); 945 IEEE80211_TX_UNLOCK(ic); 946 return (ret); 947} 948 949/* 950 * Assign priority to a frame based on any vlan tag assigned 951 * to the station and/or any Diffserv setting in an IP header. 952 * Finally, if an ACM policy is setup (in station mode) it's 953 * applied. 954 */ 955int 956ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 957{ 958 const struct ether_header *eh = mtod(m, struct ether_header *); 959 int v_wme_ac, d_wme_ac, ac; 960 961 /* 962 * Always promote PAE/EAPOL frames to high priority. 963 */ 964 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 965 /* NB: mark so others don't need to check header */ 966 m->m_flags |= M_EAPOL; 967 ac = WME_AC_VO; 968 goto done; 969 } 970 /* 971 * Non-qos traffic goes to BE. 972 */ 973 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 974 ac = WME_AC_BE; 975 goto done; 976 } 977 978 /* 979 * If node has a vlan tag then all traffic 980 * to it must have a matching tag. 981 */ 982 v_wme_ac = 0; 983 if (ni->ni_vlan != 0) { 984 if ((m->m_flags & M_VLANTAG) == 0) { 985 IEEE80211_NODE_STAT(ni, tx_novlantag); 986 return 1; 987 } 988 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 989 EVL_VLANOFTAG(ni->ni_vlan)) { 990 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 991 return 1; 992 } 993 /* map vlan priority to AC */ 994 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 995 } 996 997 /* XXX m_copydata may be too slow for fast path */ 998#ifdef INET 999 if (eh->ether_type == htons(ETHERTYPE_IP)) { 1000 uint8_t tos; 1001 /* 1002 * IP frame, map the DSCP bits from the TOS field. 1003 */ 1004 /* NB: ip header may not be in first mbuf */ 1005 m_copydata(m, sizeof(struct ether_header) + 1006 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 1007 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1008 d_wme_ac = TID_TO_WME_AC(tos); 1009 } else { 1010#endif /* INET */ 1011#ifdef INET6 1012 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 1013 uint32_t flow; 1014 uint8_t tos; 1015 /* 1016 * IPv6 frame, map the DSCP bits from the traffic class field. 1017 */ 1018 m_copydata(m, sizeof(struct ether_header) + 1019 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 1020 (caddr_t) &flow); 1021 tos = (uint8_t)(ntohl(flow) >> 20); 1022 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1023 d_wme_ac = TID_TO_WME_AC(tos); 1024 } else { 1025#endif /* INET6 */ 1026 d_wme_ac = WME_AC_BE; 1027#ifdef INET6 1028 } 1029#endif 1030#ifdef INET 1031 } 1032#endif 1033 /* 1034 * Use highest priority AC. 1035 */ 1036 if (v_wme_ac > d_wme_ac) 1037 ac = v_wme_ac; 1038 else 1039 ac = d_wme_ac; 1040 1041 /* 1042 * Apply ACM policy. 1043 */ 1044 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 1045 static const int acmap[4] = { 1046 WME_AC_BK, /* WME_AC_BE */ 1047 WME_AC_BK, /* WME_AC_BK */ 1048 WME_AC_BE, /* WME_AC_VI */ 1049 WME_AC_VI, /* WME_AC_VO */ 1050 }; 1051 struct ieee80211com *ic = ni->ni_ic; 1052 1053 while (ac != WME_AC_BK && 1054 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 1055 ac = acmap[ac]; 1056 } 1057done: 1058 M_WME_SETAC(m, ac); 1059 return 0; 1060} 1061 1062/* 1063 * Insure there is sufficient contiguous space to encapsulate the 1064 * 802.11 data frame. If room isn't already there, arrange for it. 1065 * Drivers and cipher modules assume we have done the necessary work 1066 * and fail rudely if they don't find the space they need. 1067 */ 1068struct mbuf * 1069ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 1070 struct ieee80211_key *key, struct mbuf *m) 1071{ 1072#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 1073 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 1074 1075 if (key != NULL) { 1076 /* XXX belongs in crypto code? */ 1077 needed_space += key->wk_cipher->ic_header; 1078 /* XXX frags */ 1079 /* 1080 * When crypto is being done in the host we must insure 1081 * the data are writable for the cipher routines; clone 1082 * a writable mbuf chain. 1083 * XXX handle SWMIC specially 1084 */ 1085 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 1086 m = m_unshare(m, M_NOWAIT); 1087 if (m == NULL) { 1088 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1089 "%s: cannot get writable mbuf\n", __func__); 1090 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1091 return NULL; 1092 } 1093 } 1094 } 1095 /* 1096 * We know we are called just before stripping an Ethernet 1097 * header and prepending an LLC header. This means we know 1098 * there will be 1099 * sizeof(struct ether_header) - sizeof(struct llc) 1100 * bytes recovered to which we need additional space for the 1101 * 802.11 header and any crypto header. 1102 */ 1103 /* XXX check trailing space and copy instead? */ 1104 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1105 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1106 if (n == NULL) { 1107 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1108 "%s: cannot expand storage\n", __func__); 1109 vap->iv_stats.is_tx_nobuf++; 1110 m_freem(m); 1111 return NULL; 1112 } 1113 KASSERT(needed_space <= MHLEN, 1114 ("not enough room, need %u got %d\n", needed_space, MHLEN)); 1115 /* 1116 * Setup new mbuf to have leading space to prepend the 1117 * 802.11 header and any crypto header bits that are 1118 * required (the latter are added when the driver calls 1119 * back to ieee80211_crypto_encap to do crypto encapsulation). 1120 */ 1121 /* NB: must be first 'cuz it clobbers m_data */ 1122 m_move_pkthdr(n, m); 1123 n->m_len = 0; /* NB: m_gethdr does not set */ 1124 n->m_data += needed_space; 1125 /* 1126 * Pull up Ethernet header to create the expected layout. 1127 * We could use m_pullup but that's overkill (i.e. we don't 1128 * need the actual data) and it cannot fail so do it inline 1129 * for speed. 1130 */ 1131 /* NB: struct ether_header is known to be contiguous */ 1132 n->m_len += sizeof(struct ether_header); 1133 m->m_len -= sizeof(struct ether_header); 1134 m->m_data += sizeof(struct ether_header); 1135 /* 1136 * Replace the head of the chain. 1137 */ 1138 n->m_next = m; 1139 m = n; 1140 } 1141 return m; 1142#undef TO_BE_RECLAIMED 1143} 1144 1145/* 1146 * Return the transmit key to use in sending a unicast frame. 1147 * If a unicast key is set we use that. When no unicast key is set 1148 * we fall back to the default transmit key. 1149 */ 1150static __inline struct ieee80211_key * 1151ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1152 struct ieee80211_node *ni) 1153{ 1154 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1155 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1156 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1157 return NULL; 1158 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1159 } else { 1160 return &ni->ni_ucastkey; 1161 } 1162} 1163 1164/* 1165 * Return the transmit key to use in sending a multicast frame. 1166 * Multicast traffic always uses the group key which is installed as 1167 * the default tx key. 1168 */ 1169static __inline struct ieee80211_key * 1170ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1171 struct ieee80211_node *ni) 1172{ 1173 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1174 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1175 return NULL; 1176 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1177} 1178 1179/* 1180 * Encapsulate an outbound data frame. The mbuf chain is updated. 1181 * If an error is encountered NULL is returned. The caller is required 1182 * to provide a node reference and pullup the ethernet header in the 1183 * first mbuf. 1184 * 1185 * NB: Packet is assumed to be processed by ieee80211_classify which 1186 * marked EAPOL frames w/ M_EAPOL. 1187 */ 1188struct mbuf * 1189ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1190 struct mbuf *m) 1191{ 1192#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1193#define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1194 struct ieee80211com *ic = ni->ni_ic; 1195#ifdef IEEE80211_SUPPORT_MESH 1196 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1197 struct ieee80211_meshcntl_ae10 *mc; 1198 struct ieee80211_mesh_route *rt = NULL; 1199 int dir = -1; 1200#endif 1201 struct ether_header eh; 1202 struct ieee80211_frame *wh; 1203 struct ieee80211_key *key; 1204 struct llc *llc; 1205 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1206 ieee80211_seq seqno; 1207 int meshhdrsize, meshae; 1208 uint8_t *qos; 1209 1210 IEEE80211_TX_LOCK_ASSERT(ic); 1211 1212 /* 1213 * Copy existing Ethernet header to a safe place. The 1214 * rest of the code assumes it's ok to strip it when 1215 * reorganizing state for the final encapsulation. 1216 */ 1217 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1218 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1219 1220 /* 1221 * Insure space for additional headers. First identify 1222 * transmit key to use in calculating any buffer adjustments 1223 * required. This is also used below to do privacy 1224 * encapsulation work. Then calculate the 802.11 header 1225 * size and any padding required by the driver. 1226 * 1227 * Note key may be NULL if we fall back to the default 1228 * transmit key and that is not set. In that case the 1229 * buffer may not be expanded as needed by the cipher 1230 * routines, but they will/should discard it. 1231 */ 1232 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1233 if (vap->iv_opmode == IEEE80211_M_STA || 1234 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1235 (vap->iv_opmode == IEEE80211_M_WDS && 1236 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1237 key = ieee80211_crypto_getucastkey(vap, ni); 1238 else 1239 key = ieee80211_crypto_getmcastkey(vap, ni); 1240 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1241 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1242 eh.ether_dhost, 1243 "no default transmit key (%s) deftxkey %u", 1244 __func__, vap->iv_def_txkey); 1245 vap->iv_stats.is_tx_nodefkey++; 1246 goto bad; 1247 } 1248 } else 1249 key = NULL; 1250 /* 1251 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1252 * frames so suppress use. This may be an issue if other 1253 * ap's require all data frames to be QoS-encapsulated 1254 * once negotiated in which case we'll need to make this 1255 * configurable. 1256 * NB: mesh data frames are QoS. 1257 */ 1258 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1259 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1260 (m->m_flags & M_EAPOL) == 0; 1261 if (addqos) 1262 hdrsize = sizeof(struct ieee80211_qosframe); 1263 else 1264 hdrsize = sizeof(struct ieee80211_frame); 1265#ifdef IEEE80211_SUPPORT_MESH 1266 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1267 /* 1268 * Mesh data frames are encapsulated according to the 1269 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1270 * o Group Addressed data (aka multicast) originating 1271 * at the local sta are sent w/ 3-address format and 1272 * address extension mode 00 1273 * o Individually Addressed data (aka unicast) originating 1274 * at the local sta are sent w/ 4-address format and 1275 * address extension mode 00 1276 * o Group Addressed data forwarded from a non-mesh sta are 1277 * sent w/ 3-address format and address extension mode 01 1278 * o Individually Address data from another sta are sent 1279 * w/ 4-address format and address extension mode 10 1280 */ 1281 is4addr = 0; /* NB: don't use, disable */ 1282 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1283 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1284 KASSERT(rt != NULL, ("route is NULL")); 1285 dir = IEEE80211_FC1_DIR_DSTODS; 1286 hdrsize += IEEE80211_ADDR_LEN; 1287 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1288 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1289 vap->iv_myaddr)) { 1290 IEEE80211_NOTE_MAC(vap, 1291 IEEE80211_MSG_MESH, 1292 eh.ether_dhost, 1293 "%s", "trying to send to ourself"); 1294 goto bad; 1295 } 1296 meshae = IEEE80211_MESH_AE_10; 1297 meshhdrsize = 1298 sizeof(struct ieee80211_meshcntl_ae10); 1299 } else { 1300 meshae = IEEE80211_MESH_AE_00; 1301 meshhdrsize = 1302 sizeof(struct ieee80211_meshcntl); 1303 } 1304 } else { 1305 dir = IEEE80211_FC1_DIR_FROMDS; 1306 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1307 /* proxy group */ 1308 meshae = IEEE80211_MESH_AE_01; 1309 meshhdrsize = 1310 sizeof(struct ieee80211_meshcntl_ae01); 1311 } else { 1312 /* group */ 1313 meshae = IEEE80211_MESH_AE_00; 1314 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1315 } 1316 } 1317 } else { 1318#endif 1319 /* 1320 * 4-address frames need to be generated for: 1321 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1322 * o packets sent through a vap marked for relaying 1323 * (e.g. a station operating with dynamic WDS) 1324 */ 1325 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1326 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1327 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1328 if (is4addr) 1329 hdrsize += IEEE80211_ADDR_LEN; 1330 meshhdrsize = meshae = 0; 1331#ifdef IEEE80211_SUPPORT_MESH 1332 } 1333#endif 1334 /* 1335 * Honor driver DATAPAD requirement. 1336 */ 1337 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1338 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1339 else 1340 hdrspace = hdrsize; 1341 1342 if (__predict_true((m->m_flags & M_FF) == 0)) { 1343 /* 1344 * Normal frame. 1345 */ 1346 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1347 if (m == NULL) { 1348 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1349 goto bad; 1350 } 1351 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1352 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1353 llc = mtod(m, struct llc *); 1354 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1355 llc->llc_control = LLC_UI; 1356 llc->llc_snap.org_code[0] = 0; 1357 llc->llc_snap.org_code[1] = 0; 1358 llc->llc_snap.org_code[2] = 0; 1359 llc->llc_snap.ether_type = eh.ether_type; 1360 } else { 1361#ifdef IEEE80211_SUPPORT_SUPERG 1362 /* 1363 * Aggregated frame. 1364 */ 1365 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1366 if (m == NULL) 1367#endif 1368 goto bad; 1369 } 1370 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1371 1372 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1373 if (m == NULL) { 1374 vap->iv_stats.is_tx_nobuf++; 1375 goto bad; 1376 } 1377 wh = mtod(m, struct ieee80211_frame *); 1378 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1379 *(uint16_t *)wh->i_dur = 0; 1380 qos = NULL; /* NB: quiet compiler */ 1381 if (is4addr) { 1382 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1383 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1384 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1385 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1386 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1387 } else switch (vap->iv_opmode) { 1388 case IEEE80211_M_STA: 1389 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1390 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1391 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1392 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1393 break; 1394 case IEEE80211_M_IBSS: 1395 case IEEE80211_M_AHDEMO: 1396 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1397 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1398 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1399 /* 1400 * NB: always use the bssid from iv_bss as the 1401 * neighbor's may be stale after an ibss merge 1402 */ 1403 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1404 break; 1405 case IEEE80211_M_HOSTAP: 1406 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1407 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1408 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1409 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1410 break; 1411#ifdef IEEE80211_SUPPORT_MESH 1412 case IEEE80211_M_MBSS: 1413 /* NB: offset by hdrspace to deal with DATAPAD */ 1414 mc = (struct ieee80211_meshcntl_ae10 *) 1415 (mtod(m, uint8_t *) + hdrspace); 1416 wh->i_fc[1] = dir; 1417 switch (meshae) { 1418 case IEEE80211_MESH_AE_00: /* no proxy */ 1419 mc->mc_flags = 0; 1420 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1421 IEEE80211_ADDR_COPY(wh->i_addr1, 1422 ni->ni_macaddr); 1423 IEEE80211_ADDR_COPY(wh->i_addr2, 1424 vap->iv_myaddr); 1425 IEEE80211_ADDR_COPY(wh->i_addr3, 1426 eh.ether_dhost); 1427 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1428 eh.ether_shost); 1429 qos =((struct ieee80211_qosframe_addr4 *) 1430 wh)->i_qos; 1431 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1432 /* mcast */ 1433 IEEE80211_ADDR_COPY(wh->i_addr1, 1434 eh.ether_dhost); 1435 IEEE80211_ADDR_COPY(wh->i_addr2, 1436 vap->iv_myaddr); 1437 IEEE80211_ADDR_COPY(wh->i_addr3, 1438 eh.ether_shost); 1439 qos = ((struct ieee80211_qosframe *) 1440 wh)->i_qos; 1441 } 1442 break; 1443 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1444 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1445 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1446 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1447 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1448 mc->mc_flags = 1; 1449 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1450 eh.ether_shost); 1451 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1452 break; 1453 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1454 KASSERT(rt != NULL, ("route is NULL")); 1455 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1456 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1457 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1458 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1459 mc->mc_flags = IEEE80211_MESH_AE_10; 1460 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1461 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1462 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1463 break; 1464 default: 1465 KASSERT(0, ("meshae %d", meshae)); 1466 break; 1467 } 1468 mc->mc_ttl = ms->ms_ttl; 1469 ms->ms_seq++; 1470 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1471 break; 1472#endif 1473 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1474 default: 1475 goto bad; 1476 } 1477 if (m->m_flags & M_MORE_DATA) 1478 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1479 if (addqos) { 1480 int ac, tid; 1481 1482 if (is4addr) { 1483 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1484 /* NB: mesh case handled earlier */ 1485 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1486 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1487 ac = M_WME_GETAC(m); 1488 /* map from access class/queue to 11e header priorty value */ 1489 tid = WME_AC_TO_TID(ac); 1490 qos[0] = tid & IEEE80211_QOS_TID; 1491 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1492 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1493#ifdef IEEE80211_SUPPORT_MESH 1494 if (vap->iv_opmode == IEEE80211_M_MBSS) 1495 qos[1] = IEEE80211_QOS_MC; 1496 else 1497#endif 1498 qos[1] = 0; 1499 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1500 1501 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1502 /* 1503 * NB: don't assign a sequence # to potential 1504 * aggregates; we expect this happens at the 1505 * point the frame comes off any aggregation q 1506 * as otherwise we may introduce holes in the 1507 * BA sequence space and/or make window accouting 1508 * more difficult. 1509 * 1510 * XXX may want to control this with a driver 1511 * capability; this may also change when we pull 1512 * aggregation up into net80211 1513 */ 1514 seqno = ni->ni_txseqs[tid]++; 1515 *(uint16_t *)wh->i_seq = 1516 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1517 M_SEQNO_SET(m, seqno); 1518 } 1519 } else { 1520 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1521 *(uint16_t *)wh->i_seq = 1522 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1523 M_SEQNO_SET(m, seqno); 1524 } 1525 1526 1527 /* check if xmit fragmentation is required */ 1528 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1529 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1530 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1531 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1532 if (key != NULL) { 1533 /* 1534 * IEEE 802.1X: send EAPOL frames always in the clear. 1535 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1536 */ 1537 if ((m->m_flags & M_EAPOL) == 0 || 1538 ((vap->iv_flags & IEEE80211_F_WPA) && 1539 (vap->iv_opmode == IEEE80211_M_STA ? 1540 !IEEE80211_KEY_UNDEFINED(key) : 1541 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1542 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 1543 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1544 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1545 eh.ether_dhost, 1546 "%s", "enmic failed, discard frame"); 1547 vap->iv_stats.is_crypto_enmicfail++; 1548 goto bad; 1549 } 1550 } 1551 } 1552 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1553 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1554 goto bad; 1555 1556 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1557 1558 IEEE80211_NODE_STAT(ni, tx_data); 1559 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1560 IEEE80211_NODE_STAT(ni, tx_mcast); 1561 m->m_flags |= M_MCAST; 1562 } else 1563 IEEE80211_NODE_STAT(ni, tx_ucast); 1564 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1565 1566 return m; 1567bad: 1568 if (m != NULL) 1569 m_freem(m); 1570 return NULL; 1571#undef WH4 1572#undef MC01 1573} 1574 1575/* 1576 * Fragment the frame according to the specified mtu. 1577 * The size of the 802.11 header (w/o padding) is provided 1578 * so we don't need to recalculate it. We create a new 1579 * mbuf for each fragment and chain it through m_nextpkt; 1580 * we might be able to optimize this by reusing the original 1581 * packet's mbufs but that is significantly more complicated. 1582 */ 1583static int 1584ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1585 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1586{ 1587 struct ieee80211com *ic = vap->iv_ic; 1588 struct ieee80211_frame *wh, *whf; 1589 struct mbuf *m, *prev, *next; 1590 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1591 u_int hdrspace; 1592 1593 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1594 KASSERT(m0->m_pkthdr.len > mtu, 1595 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1596 1597 /* 1598 * Honor driver DATAPAD requirement. 1599 */ 1600 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1601 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1602 else 1603 hdrspace = hdrsize; 1604 1605 wh = mtod(m0, struct ieee80211_frame *); 1606 /* NB: mark the first frag; it will be propagated below */ 1607 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1608 totalhdrsize = hdrspace + ciphdrsize; 1609 fragno = 1; 1610 off = mtu - ciphdrsize; 1611 remainder = m0->m_pkthdr.len - off; 1612 prev = m0; 1613 do { 1614 fragsize = totalhdrsize + remainder; 1615 if (fragsize > mtu) 1616 fragsize = mtu; 1617 /* XXX fragsize can be >2048! */ 1618 KASSERT(fragsize < MCLBYTES, 1619 ("fragment size %u too big!", fragsize)); 1620 if (fragsize > MHLEN) 1621 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1622 else 1623 m = m_gethdr(M_NOWAIT, MT_DATA); 1624 if (m == NULL) 1625 goto bad; 1626 /* leave room to prepend any cipher header */ 1627 m_align(m, fragsize - ciphdrsize); 1628 1629 /* 1630 * Form the header in the fragment. Note that since 1631 * we mark the first fragment with the MORE_FRAG bit 1632 * it automatically is propagated to each fragment; we 1633 * need only clear it on the last fragment (done below). 1634 * NB: frag 1+ dont have Mesh Control field present. 1635 */ 1636 whf = mtod(m, struct ieee80211_frame *); 1637 memcpy(whf, wh, hdrsize); 1638#ifdef IEEE80211_SUPPORT_MESH 1639 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1640 if (IEEE80211_IS_DSTODS(wh)) 1641 ((struct ieee80211_qosframe_addr4 *) 1642 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1643 else 1644 ((struct ieee80211_qosframe *) 1645 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1646 } 1647#endif 1648 *(uint16_t *)&whf->i_seq[0] |= htole16( 1649 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1650 IEEE80211_SEQ_FRAG_SHIFT); 1651 fragno++; 1652 1653 payload = fragsize - totalhdrsize; 1654 /* NB: destination is known to be contiguous */ 1655 1656 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace); 1657 m->m_len = hdrspace + payload; 1658 m->m_pkthdr.len = hdrspace + payload; 1659 m->m_flags |= M_FRAG; 1660 1661 /* chain up the fragment */ 1662 prev->m_nextpkt = m; 1663 prev = m; 1664 1665 /* deduct fragment just formed */ 1666 remainder -= payload; 1667 off += payload; 1668 } while (remainder != 0); 1669 1670 /* set the last fragment */ 1671 m->m_flags |= M_LASTFRAG; 1672 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1673 1674 /* strip first mbuf now that everything has been copied */ 1675 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1676 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1677 1678 vap->iv_stats.is_tx_fragframes++; 1679 vap->iv_stats.is_tx_frags += fragno-1; 1680 1681 return 1; 1682bad: 1683 /* reclaim fragments but leave original frame for caller to free */ 1684 for (m = m0->m_nextpkt; m != NULL; m = next) { 1685 next = m->m_nextpkt; 1686 m->m_nextpkt = NULL; /* XXX paranoid */ 1687 m_freem(m); 1688 } 1689 m0->m_nextpkt = NULL; 1690 return 0; 1691} 1692 1693/* 1694 * Add a supported rates element id to a frame. 1695 */ 1696uint8_t * 1697ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1698{ 1699 int nrates; 1700 1701 *frm++ = IEEE80211_ELEMID_RATES; 1702 nrates = rs->rs_nrates; 1703 if (nrates > IEEE80211_RATE_SIZE) 1704 nrates = IEEE80211_RATE_SIZE; 1705 *frm++ = nrates; 1706 memcpy(frm, rs->rs_rates, nrates); 1707 return frm + nrates; 1708} 1709 1710/* 1711 * Add an extended supported rates element id to a frame. 1712 */ 1713uint8_t * 1714ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1715{ 1716 /* 1717 * Add an extended supported rates element if operating in 11g mode. 1718 */ 1719 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1720 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1721 *frm++ = IEEE80211_ELEMID_XRATES; 1722 *frm++ = nrates; 1723 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1724 frm += nrates; 1725 } 1726 return frm; 1727} 1728 1729/* 1730 * Add an ssid element to a frame. 1731 */ 1732uint8_t * 1733ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1734{ 1735 *frm++ = IEEE80211_ELEMID_SSID; 1736 *frm++ = len; 1737 memcpy(frm, ssid, len); 1738 return frm + len; 1739} 1740 1741/* 1742 * Add an erp element to a frame. 1743 */ 1744static uint8_t * 1745ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1746{ 1747 uint8_t erp; 1748 1749 *frm++ = IEEE80211_ELEMID_ERP; 1750 *frm++ = 1; 1751 erp = 0; 1752 if (ic->ic_nonerpsta != 0) 1753 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1754 if (ic->ic_flags & IEEE80211_F_USEPROT) 1755 erp |= IEEE80211_ERP_USE_PROTECTION; 1756 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1757 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1758 *frm++ = erp; 1759 return frm; 1760} 1761 1762/* 1763 * Add a CFParams element to a frame. 1764 */ 1765static uint8_t * 1766ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1767{ 1768#define ADDSHORT(frm, v) do { \ 1769 LE_WRITE_2(frm, v); \ 1770 frm += 2; \ 1771} while (0) 1772 *frm++ = IEEE80211_ELEMID_CFPARMS; 1773 *frm++ = 6; 1774 *frm++ = 0; /* CFP count */ 1775 *frm++ = 2; /* CFP period */ 1776 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1777 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1778 return frm; 1779#undef ADDSHORT 1780} 1781 1782static __inline uint8_t * 1783add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1784{ 1785 memcpy(frm, ie->ie_data, ie->ie_len); 1786 return frm + ie->ie_len; 1787} 1788 1789static __inline uint8_t * 1790add_ie(uint8_t *frm, const uint8_t *ie) 1791{ 1792 memcpy(frm, ie, 2 + ie[1]); 1793 return frm + 2 + ie[1]; 1794} 1795 1796#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1797/* 1798 * Add a WME information element to a frame. 1799 */ 1800static uint8_t * 1801ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1802{ 1803 static const struct ieee80211_wme_info info = { 1804 .wme_id = IEEE80211_ELEMID_VENDOR, 1805 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1806 .wme_oui = { WME_OUI_BYTES }, 1807 .wme_type = WME_OUI_TYPE, 1808 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1809 .wme_version = WME_VERSION, 1810 .wme_info = 0, 1811 }; 1812 memcpy(frm, &info, sizeof(info)); 1813 return frm + sizeof(info); 1814} 1815 1816/* 1817 * Add a WME parameters element to a frame. 1818 */ 1819static uint8_t * 1820ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1821{ 1822#define SM(_v, _f) (((_v) << _f##_S) & _f) 1823#define ADDSHORT(frm, v) do { \ 1824 LE_WRITE_2(frm, v); \ 1825 frm += 2; \ 1826} while (0) 1827 /* NB: this works 'cuz a param has an info at the front */ 1828 static const struct ieee80211_wme_info param = { 1829 .wme_id = IEEE80211_ELEMID_VENDOR, 1830 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1831 .wme_oui = { WME_OUI_BYTES }, 1832 .wme_type = WME_OUI_TYPE, 1833 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1834 .wme_version = WME_VERSION, 1835 }; 1836 int i; 1837 1838 memcpy(frm, ¶m, sizeof(param)); 1839 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1840 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1841 *frm++ = 0; /* reserved field */ 1842 for (i = 0; i < WME_NUM_AC; i++) { 1843 const struct wmeParams *ac = 1844 &wme->wme_bssChanParams.cap_wmeParams[i]; 1845 *frm++ = SM(i, WME_PARAM_ACI) 1846 | SM(ac->wmep_acm, WME_PARAM_ACM) 1847 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1848 ; 1849 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1850 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1851 ; 1852 ADDSHORT(frm, ac->wmep_txopLimit); 1853 } 1854 return frm; 1855#undef SM 1856#undef ADDSHORT 1857} 1858#undef WME_OUI_BYTES 1859 1860/* 1861 * Add an 11h Power Constraint element to a frame. 1862 */ 1863static uint8_t * 1864ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1865{ 1866 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1867 /* XXX per-vap tx power limit? */ 1868 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1869 1870 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1871 frm[1] = 1; 1872 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1873 return frm + 3; 1874} 1875 1876/* 1877 * Add an 11h Power Capability element to a frame. 1878 */ 1879static uint8_t * 1880ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1881{ 1882 frm[0] = IEEE80211_ELEMID_PWRCAP; 1883 frm[1] = 2; 1884 frm[2] = c->ic_minpower; 1885 frm[3] = c->ic_maxpower; 1886 return frm + 4; 1887} 1888 1889/* 1890 * Add an 11h Supported Channels element to a frame. 1891 */ 1892static uint8_t * 1893ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1894{ 1895 static const int ielen = 26; 1896 1897 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1898 frm[1] = ielen; 1899 /* XXX not correct */ 1900 memcpy(frm+2, ic->ic_chan_avail, ielen); 1901 return frm + 2 + ielen; 1902} 1903 1904/* 1905 * Add an 11h Quiet time element to a frame. 1906 */ 1907static uint8_t * 1908ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 1909{ 1910 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 1911 1912 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 1913 quiet->len = 6; 1914 if (vap->iv_quiet_count_value == 1) 1915 vap->iv_quiet_count_value = vap->iv_quiet_count; 1916 else if (vap->iv_quiet_count_value > 1) 1917 vap->iv_quiet_count_value--; 1918 1919 if (vap->iv_quiet_count_value == 0) { 1920 /* value 0 is reserved as per 802.11h standerd */ 1921 vap->iv_quiet_count_value = 1; 1922 } 1923 1924 quiet->tbttcount = vap->iv_quiet_count_value; 1925 quiet->period = vap->iv_quiet_period; 1926 quiet->duration = htole16(vap->iv_quiet_duration); 1927 quiet->offset = htole16(vap->iv_quiet_offset); 1928 return frm + sizeof(*quiet); 1929} 1930 1931/* 1932 * Add an 11h Channel Switch Announcement element to a frame. 1933 * Note that we use the per-vap CSA count to adjust the global 1934 * counter so we can use this routine to form probe response 1935 * frames and get the current count. 1936 */ 1937static uint8_t * 1938ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1939{ 1940 struct ieee80211com *ic = vap->iv_ic; 1941 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1942 1943 csa->csa_ie = IEEE80211_ELEMID_CSA; 1944 csa->csa_len = 3; 1945 csa->csa_mode = 1; /* XXX force quiet on channel */ 1946 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1947 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1948 return frm + sizeof(*csa); 1949} 1950 1951/* 1952 * Add an 11h country information element to a frame. 1953 */ 1954static uint8_t * 1955ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1956{ 1957 1958 if (ic->ic_countryie == NULL || 1959 ic->ic_countryie_chan != ic->ic_bsschan) { 1960 /* 1961 * Handle lazy construction of ie. This is done on 1962 * first use and after a channel change that requires 1963 * re-calculation. 1964 */ 1965 if (ic->ic_countryie != NULL) 1966 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 1967 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1968 if (ic->ic_countryie == NULL) 1969 return frm; 1970 ic->ic_countryie_chan = ic->ic_bsschan; 1971 } 1972 return add_appie(frm, ic->ic_countryie); 1973} 1974 1975uint8_t * 1976ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap) 1977{ 1978 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) 1979 return (add_ie(frm, vap->iv_wpa_ie)); 1980 else { 1981 /* XXX else complain? */ 1982 return (frm); 1983 } 1984} 1985 1986uint8_t * 1987ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap) 1988{ 1989 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL) 1990 return (add_ie(frm, vap->iv_rsn_ie)); 1991 else { 1992 /* XXX else complain? */ 1993 return (frm); 1994 } 1995} 1996 1997uint8_t * 1998ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni) 1999{ 2000 if (ni->ni_flags & IEEE80211_NODE_QOS) { 2001 *frm++ = IEEE80211_ELEMID_QOS; 2002 *frm++ = 1; 2003 *frm++ = 0; 2004 } 2005 2006 return (frm); 2007} 2008 2009/* 2010 * Send a probe request frame with the specified ssid 2011 * and any optional information element data. 2012 */ 2013int 2014ieee80211_send_probereq(struct ieee80211_node *ni, 2015 const uint8_t sa[IEEE80211_ADDR_LEN], 2016 const uint8_t da[IEEE80211_ADDR_LEN], 2017 const uint8_t bssid[IEEE80211_ADDR_LEN], 2018 const uint8_t *ssid, size_t ssidlen) 2019{ 2020 struct ieee80211vap *vap = ni->ni_vap; 2021 struct ieee80211com *ic = ni->ni_ic; 2022 const struct ieee80211_txparam *tp; 2023 struct ieee80211_bpf_params params; 2024 struct ieee80211_frame *wh; 2025 const struct ieee80211_rateset *rs; 2026 struct mbuf *m; 2027 uint8_t *frm; 2028 int ret; 2029 2030 if (vap->iv_state == IEEE80211_S_CAC) { 2031 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 2032 "block %s frame in CAC state", "probe request"); 2033 vap->iv_stats.is_tx_badstate++; 2034 return EIO; /* XXX */ 2035 } 2036 2037 /* 2038 * Hold a reference on the node so it doesn't go away until after 2039 * the xmit is complete all the way in the driver. On error we 2040 * will remove our reference. 2041 */ 2042 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2043 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2044 __func__, __LINE__, 2045 ni, ether_sprintf(ni->ni_macaddr), 2046 ieee80211_node_refcnt(ni)+1); 2047 ieee80211_ref_node(ni); 2048 2049 /* 2050 * prreq frame format 2051 * [tlv] ssid 2052 * [tlv] supported rates 2053 * [tlv] RSN (optional) 2054 * [tlv] extended supported rates 2055 * [tlv] WPA (optional) 2056 * [tlv] user-specified ie's 2057 */ 2058 m = ieee80211_getmgtframe(&frm, 2059 ic->ic_headroom + sizeof(struct ieee80211_frame), 2060 2 + IEEE80211_NWID_LEN 2061 + 2 + IEEE80211_RATE_SIZE 2062 + sizeof(struct ieee80211_ie_wpa) 2063 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2064 + sizeof(struct ieee80211_ie_wpa) 2065 + (vap->iv_appie_probereq != NULL ? 2066 vap->iv_appie_probereq->ie_len : 0) 2067 ); 2068 if (m == NULL) { 2069 vap->iv_stats.is_tx_nobuf++; 2070 ieee80211_free_node(ni); 2071 return ENOMEM; 2072 } 2073 2074 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 2075 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 2076 frm = ieee80211_add_rates(frm, rs); 2077 frm = ieee80211_add_rsn(frm, vap); 2078 frm = ieee80211_add_xrates(frm, rs); 2079 frm = ieee80211_add_wpa(frm, vap); 2080 if (vap->iv_appie_probereq != NULL) 2081 frm = add_appie(frm, vap->iv_appie_probereq); 2082 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2083 2084 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 2085 ("leading space %zd", M_LEADINGSPACE(m))); 2086 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2087 if (m == NULL) { 2088 /* NB: cannot happen */ 2089 ieee80211_free_node(ni); 2090 return ENOMEM; 2091 } 2092 2093 IEEE80211_TX_LOCK(ic); 2094 wh = mtod(m, struct ieee80211_frame *); 2095 ieee80211_send_setup(ni, m, 2096 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 2097 IEEE80211_NONQOS_TID, sa, da, bssid); 2098 /* XXX power management? */ 2099 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2100 2101 M_WME_SETAC(m, WME_AC_BE); 2102 2103 IEEE80211_NODE_STAT(ni, tx_probereq); 2104 IEEE80211_NODE_STAT(ni, tx_mgmt); 2105 2106 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2107 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 2108 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 2109 ssidlen, ssid); 2110 2111 memset(¶ms, 0, sizeof(params)); 2112 params.ibp_pri = M_WME_GETAC(m); 2113 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 2114 params.ibp_rate0 = tp->mgmtrate; 2115 if (IEEE80211_IS_MULTICAST(da)) { 2116 params.ibp_flags |= IEEE80211_BPF_NOACK; 2117 params.ibp_try0 = 1; 2118 } else 2119 params.ibp_try0 = tp->maxretry; 2120 params.ibp_power = ni->ni_txpower; 2121 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 2122 IEEE80211_TX_UNLOCK(ic); 2123 return (ret); 2124} 2125 2126/* 2127 * Calculate capability information for mgt frames. 2128 */ 2129uint16_t 2130ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2131{ 2132 struct ieee80211com *ic = vap->iv_ic; 2133 uint16_t capinfo; 2134 2135 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2136 2137 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2138 capinfo = IEEE80211_CAPINFO_ESS; 2139 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2140 capinfo = IEEE80211_CAPINFO_IBSS; 2141 else 2142 capinfo = 0; 2143 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2144 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2145 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2146 IEEE80211_IS_CHAN_2GHZ(chan)) 2147 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2148 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2149 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2150 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2151 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2152 return capinfo; 2153} 2154 2155/* 2156 * Send a management frame. The node is for the destination (or ic_bss 2157 * when in station mode). Nodes other than ic_bss have their reference 2158 * count bumped to reflect our use for an indeterminant time. 2159 */ 2160int 2161ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2162{ 2163#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2164#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2165 struct ieee80211vap *vap = ni->ni_vap; 2166 struct ieee80211com *ic = ni->ni_ic; 2167 struct ieee80211_node *bss = vap->iv_bss; 2168 struct ieee80211_bpf_params params; 2169 struct mbuf *m; 2170 uint8_t *frm; 2171 uint16_t capinfo; 2172 int has_challenge, is_shared_key, ret, status; 2173 2174 KASSERT(ni != NULL, ("null node")); 2175 2176 /* 2177 * Hold a reference on the node so it doesn't go away until after 2178 * the xmit is complete all the way in the driver. On error we 2179 * will remove our reference. 2180 */ 2181 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2182 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2183 __func__, __LINE__, 2184 ni, ether_sprintf(ni->ni_macaddr), 2185 ieee80211_node_refcnt(ni)+1); 2186 ieee80211_ref_node(ni); 2187 2188 memset(¶ms, 0, sizeof(params)); 2189 switch (type) { 2190 2191 case IEEE80211_FC0_SUBTYPE_AUTH: 2192 status = arg >> 16; 2193 arg &= 0xffff; 2194 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2195 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2196 ni->ni_challenge != NULL); 2197 2198 /* 2199 * Deduce whether we're doing open authentication or 2200 * shared key authentication. We do the latter if 2201 * we're in the middle of a shared key authentication 2202 * handshake or if we're initiating an authentication 2203 * request and configured to use shared key. 2204 */ 2205 is_shared_key = has_challenge || 2206 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2207 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2208 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2209 2210 m = ieee80211_getmgtframe(&frm, 2211 ic->ic_headroom + sizeof(struct ieee80211_frame), 2212 3 * sizeof(uint16_t) 2213 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2214 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2215 ); 2216 if (m == NULL) 2217 senderr(ENOMEM, is_tx_nobuf); 2218 2219 ((uint16_t *)frm)[0] = 2220 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2221 : htole16(IEEE80211_AUTH_ALG_OPEN); 2222 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2223 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2224 2225 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2226 ((uint16_t *)frm)[3] = 2227 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2228 IEEE80211_ELEMID_CHALLENGE); 2229 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2230 IEEE80211_CHALLENGE_LEN); 2231 m->m_pkthdr.len = m->m_len = 2232 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2233 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2234 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2235 "request encrypt frame (%s)", __func__); 2236 /* mark frame for encryption */ 2237 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2238 } 2239 } else 2240 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2241 2242 /* XXX not right for shared key */ 2243 if (status == IEEE80211_STATUS_SUCCESS) 2244 IEEE80211_NODE_STAT(ni, tx_auth); 2245 else 2246 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2247 2248 if (vap->iv_opmode == IEEE80211_M_STA) 2249 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2250 (void *) vap->iv_state); 2251 break; 2252 2253 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2254 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2255 "send station deauthenticate (reason %d)", arg); 2256 m = ieee80211_getmgtframe(&frm, 2257 ic->ic_headroom + sizeof(struct ieee80211_frame), 2258 sizeof(uint16_t)); 2259 if (m == NULL) 2260 senderr(ENOMEM, is_tx_nobuf); 2261 *(uint16_t *)frm = htole16(arg); /* reason */ 2262 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2263 2264 IEEE80211_NODE_STAT(ni, tx_deauth); 2265 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2266 2267 ieee80211_node_unauthorize(ni); /* port closed */ 2268 break; 2269 2270 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2271 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2272 /* 2273 * asreq frame format 2274 * [2] capability information 2275 * [2] listen interval 2276 * [6*] current AP address (reassoc only) 2277 * [tlv] ssid 2278 * [tlv] supported rates 2279 * [tlv] extended supported rates 2280 * [4] power capability (optional) 2281 * [28] supported channels (optional) 2282 * [tlv] HT capabilities 2283 * [tlv] WME (optional) 2284 * [tlv] Vendor OUI HT capabilities (optional) 2285 * [tlv] Atheros capabilities (if negotiated) 2286 * [tlv] AppIE's (optional) 2287 */ 2288 m = ieee80211_getmgtframe(&frm, 2289 ic->ic_headroom + sizeof(struct ieee80211_frame), 2290 sizeof(uint16_t) 2291 + sizeof(uint16_t) 2292 + IEEE80211_ADDR_LEN 2293 + 2 + IEEE80211_NWID_LEN 2294 + 2 + IEEE80211_RATE_SIZE 2295 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2296 + 4 2297 + 2 + 26 2298 + sizeof(struct ieee80211_wme_info) 2299 + sizeof(struct ieee80211_ie_htcap) 2300 + 4 + sizeof(struct ieee80211_ie_htcap) 2301#ifdef IEEE80211_SUPPORT_SUPERG 2302 + sizeof(struct ieee80211_ath_ie) 2303#endif 2304 + (vap->iv_appie_wpa != NULL ? 2305 vap->iv_appie_wpa->ie_len : 0) 2306 + (vap->iv_appie_assocreq != NULL ? 2307 vap->iv_appie_assocreq->ie_len : 0) 2308 ); 2309 if (m == NULL) 2310 senderr(ENOMEM, is_tx_nobuf); 2311 2312 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2313 ("wrong mode %u", vap->iv_opmode)); 2314 capinfo = IEEE80211_CAPINFO_ESS; 2315 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2316 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2317 /* 2318 * NB: Some 11a AP's reject the request when 2319 * short premable is set. 2320 */ 2321 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2322 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2323 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2324 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2325 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2326 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2327 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2328 (vap->iv_flags & IEEE80211_F_DOTH)) 2329 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2330 *(uint16_t *)frm = htole16(capinfo); 2331 frm += 2; 2332 2333 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2334 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2335 bss->ni_intval)); 2336 frm += 2; 2337 2338 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2339 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2340 frm += IEEE80211_ADDR_LEN; 2341 } 2342 2343 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2344 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2345 frm = ieee80211_add_rsn(frm, vap); 2346 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2347 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2348 frm = ieee80211_add_powercapability(frm, 2349 ic->ic_curchan); 2350 frm = ieee80211_add_supportedchannels(frm, ic); 2351 } 2352 2353 /* 2354 * Check the channel - we may be using an 11n NIC with an 2355 * 11n capable station, but we're configured to be an 11b 2356 * channel. 2357 */ 2358 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2359 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2360 ni->ni_ies.htcap_ie != NULL && 2361 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) { 2362 frm = ieee80211_add_htcap(frm, ni); 2363 } 2364 frm = ieee80211_add_wpa(frm, vap); 2365 if ((ic->ic_flags & IEEE80211_F_WME) && 2366 ni->ni_ies.wme_ie != NULL) 2367 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2368 2369 /* 2370 * Same deal - only send HT info if we're on an 11n 2371 * capable channel. 2372 */ 2373 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2374 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2375 ni->ni_ies.htcap_ie != NULL && 2376 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) { 2377 frm = ieee80211_add_htcap_vendor(frm, ni); 2378 } 2379#ifdef IEEE80211_SUPPORT_SUPERG 2380 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2381 frm = ieee80211_add_ath(frm, 2382 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2383 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2384 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2385 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2386 } 2387#endif /* IEEE80211_SUPPORT_SUPERG */ 2388 if (vap->iv_appie_assocreq != NULL) 2389 frm = add_appie(frm, vap->iv_appie_assocreq); 2390 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2391 2392 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2393 (void *) vap->iv_state); 2394 break; 2395 2396 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2397 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2398 /* 2399 * asresp frame format 2400 * [2] capability information 2401 * [2] status 2402 * [2] association ID 2403 * [tlv] supported rates 2404 * [tlv] extended supported rates 2405 * [tlv] HT capabilities (standard, if STA enabled) 2406 * [tlv] HT information (standard, if STA enabled) 2407 * [tlv] WME (if configured and STA enabled) 2408 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2409 * [tlv] HT information (vendor OUI, if STA enabled) 2410 * [tlv] Atheros capabilities (if STA enabled) 2411 * [tlv] AppIE's (optional) 2412 */ 2413 m = ieee80211_getmgtframe(&frm, 2414 ic->ic_headroom + sizeof(struct ieee80211_frame), 2415 sizeof(uint16_t) 2416 + sizeof(uint16_t) 2417 + sizeof(uint16_t) 2418 + 2 + IEEE80211_RATE_SIZE 2419 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2420 + sizeof(struct ieee80211_ie_htcap) + 4 2421 + sizeof(struct ieee80211_ie_htinfo) + 4 2422 + sizeof(struct ieee80211_wme_param) 2423#ifdef IEEE80211_SUPPORT_SUPERG 2424 + sizeof(struct ieee80211_ath_ie) 2425#endif 2426 + (vap->iv_appie_assocresp != NULL ? 2427 vap->iv_appie_assocresp->ie_len : 0) 2428 ); 2429 if (m == NULL) 2430 senderr(ENOMEM, is_tx_nobuf); 2431 2432 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2433 *(uint16_t *)frm = htole16(capinfo); 2434 frm += 2; 2435 2436 *(uint16_t *)frm = htole16(arg); /* status */ 2437 frm += 2; 2438 2439 if (arg == IEEE80211_STATUS_SUCCESS) { 2440 *(uint16_t *)frm = htole16(ni->ni_associd); 2441 IEEE80211_NODE_STAT(ni, tx_assoc); 2442 } else 2443 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2444 frm += 2; 2445 2446 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2447 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2448 /* NB: respond according to what we received */ 2449 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2450 frm = ieee80211_add_htcap(frm, ni); 2451 frm = ieee80211_add_htinfo(frm, ni); 2452 } 2453 if ((vap->iv_flags & IEEE80211_F_WME) && 2454 ni->ni_ies.wme_ie != NULL) 2455 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2456 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2457 frm = ieee80211_add_htcap_vendor(frm, ni); 2458 frm = ieee80211_add_htinfo_vendor(frm, ni); 2459 } 2460#ifdef IEEE80211_SUPPORT_SUPERG 2461 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2462 frm = ieee80211_add_ath(frm, 2463 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2464 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2465 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2466 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2467#endif /* IEEE80211_SUPPORT_SUPERG */ 2468 if (vap->iv_appie_assocresp != NULL) 2469 frm = add_appie(frm, vap->iv_appie_assocresp); 2470 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2471 break; 2472 2473 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2474 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2475 "send station disassociate (reason %d)", arg); 2476 m = ieee80211_getmgtframe(&frm, 2477 ic->ic_headroom + sizeof(struct ieee80211_frame), 2478 sizeof(uint16_t)); 2479 if (m == NULL) 2480 senderr(ENOMEM, is_tx_nobuf); 2481 *(uint16_t *)frm = htole16(arg); /* reason */ 2482 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2483 2484 IEEE80211_NODE_STAT(ni, tx_disassoc); 2485 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2486 break; 2487 2488 default: 2489 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2490 "invalid mgmt frame type %u", type); 2491 senderr(EINVAL, is_tx_unknownmgt); 2492 /* NOTREACHED */ 2493 } 2494 2495 /* NB: force non-ProbeResp frames to the highest queue */ 2496 params.ibp_pri = WME_AC_VO; 2497 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2498 /* NB: we know all frames are unicast */ 2499 params.ibp_try0 = bss->ni_txparms->maxretry; 2500 params.ibp_power = bss->ni_txpower; 2501 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2502bad: 2503 ieee80211_free_node(ni); 2504 return ret; 2505#undef senderr 2506#undef HTFLAGS 2507} 2508 2509/* 2510 * Return an mbuf with a probe response frame in it. 2511 * Space is left to prepend and 802.11 header at the 2512 * front but it's left to the caller to fill in. 2513 */ 2514struct mbuf * 2515ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2516{ 2517 struct ieee80211vap *vap = bss->ni_vap; 2518 struct ieee80211com *ic = bss->ni_ic; 2519 const struct ieee80211_rateset *rs; 2520 struct mbuf *m; 2521 uint16_t capinfo; 2522 uint8_t *frm; 2523 2524 /* 2525 * probe response frame format 2526 * [8] time stamp 2527 * [2] beacon interval 2528 * [2] cabability information 2529 * [tlv] ssid 2530 * [tlv] supported rates 2531 * [tlv] parameter set (FH/DS) 2532 * [tlv] parameter set (IBSS) 2533 * [tlv] country (optional) 2534 * [3] power control (optional) 2535 * [5] channel switch announcement (CSA) (optional) 2536 * [tlv] extended rate phy (ERP) 2537 * [tlv] extended supported rates 2538 * [tlv] RSN (optional) 2539 * [tlv] HT capabilities 2540 * [tlv] HT information 2541 * [tlv] WPA (optional) 2542 * [tlv] WME (optional) 2543 * [tlv] Vendor OUI HT capabilities (optional) 2544 * [tlv] Vendor OUI HT information (optional) 2545 * [tlv] Atheros capabilities 2546 * [tlv] AppIE's (optional) 2547 * [tlv] Mesh ID (MBSS) 2548 * [tlv] Mesh Conf (MBSS) 2549 */ 2550 m = ieee80211_getmgtframe(&frm, 2551 ic->ic_headroom + sizeof(struct ieee80211_frame), 2552 8 2553 + sizeof(uint16_t) 2554 + sizeof(uint16_t) 2555 + 2 + IEEE80211_NWID_LEN 2556 + 2 + IEEE80211_RATE_SIZE 2557 + 7 /* max(7,3) */ 2558 + IEEE80211_COUNTRY_MAX_SIZE 2559 + 3 2560 + sizeof(struct ieee80211_csa_ie) 2561 + sizeof(struct ieee80211_quiet_ie) 2562 + 3 2563 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2564 + sizeof(struct ieee80211_ie_wpa) 2565 + sizeof(struct ieee80211_ie_htcap) 2566 + sizeof(struct ieee80211_ie_htinfo) 2567 + sizeof(struct ieee80211_ie_wpa) 2568 + sizeof(struct ieee80211_wme_param) 2569 + 4 + sizeof(struct ieee80211_ie_htcap) 2570 + 4 + sizeof(struct ieee80211_ie_htinfo) 2571#ifdef IEEE80211_SUPPORT_SUPERG 2572 + sizeof(struct ieee80211_ath_ie) 2573#endif 2574#ifdef IEEE80211_SUPPORT_MESH 2575 + 2 + IEEE80211_MESHID_LEN 2576 + sizeof(struct ieee80211_meshconf_ie) 2577#endif 2578 + (vap->iv_appie_proberesp != NULL ? 2579 vap->iv_appie_proberesp->ie_len : 0) 2580 ); 2581 if (m == NULL) { 2582 vap->iv_stats.is_tx_nobuf++; 2583 return NULL; 2584 } 2585 2586 memset(frm, 0, 8); /* timestamp should be filled later */ 2587 frm += 8; 2588 *(uint16_t *)frm = htole16(bss->ni_intval); 2589 frm += 2; 2590 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2591 *(uint16_t *)frm = htole16(capinfo); 2592 frm += 2; 2593 2594 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2595 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2596 frm = ieee80211_add_rates(frm, rs); 2597 2598 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2599 *frm++ = IEEE80211_ELEMID_FHPARMS; 2600 *frm++ = 5; 2601 *frm++ = bss->ni_fhdwell & 0x00ff; 2602 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2603 *frm++ = IEEE80211_FH_CHANSET( 2604 ieee80211_chan2ieee(ic, bss->ni_chan)); 2605 *frm++ = IEEE80211_FH_CHANPAT( 2606 ieee80211_chan2ieee(ic, bss->ni_chan)); 2607 *frm++ = bss->ni_fhindex; 2608 } else { 2609 *frm++ = IEEE80211_ELEMID_DSPARMS; 2610 *frm++ = 1; 2611 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2612 } 2613 2614 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2615 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2616 *frm++ = 2; 2617 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2618 } 2619 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2620 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2621 frm = ieee80211_add_countryie(frm, ic); 2622 if (vap->iv_flags & IEEE80211_F_DOTH) { 2623 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2624 frm = ieee80211_add_powerconstraint(frm, vap); 2625 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2626 frm = ieee80211_add_csa(frm, vap); 2627 } 2628 if (vap->iv_flags & IEEE80211_F_DOTH) { 2629 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2630 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2631 if (vap->iv_quiet) 2632 frm = ieee80211_add_quiet(frm, vap); 2633 } 2634 } 2635 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2636 frm = ieee80211_add_erp(frm, ic); 2637 frm = ieee80211_add_xrates(frm, rs); 2638 frm = ieee80211_add_rsn(frm, vap); 2639 /* 2640 * NB: legacy 11b clients do not get certain ie's. 2641 * The caller identifies such clients by passing 2642 * a token in legacy to us. Could expand this to be 2643 * any legacy client for stuff like HT ie's. 2644 */ 2645 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2646 legacy != IEEE80211_SEND_LEGACY_11B) { 2647 frm = ieee80211_add_htcap(frm, bss); 2648 frm = ieee80211_add_htinfo(frm, bss); 2649 } 2650 frm = ieee80211_add_wpa(frm, vap); 2651 if (vap->iv_flags & IEEE80211_F_WME) 2652 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2653 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2654 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2655 legacy != IEEE80211_SEND_LEGACY_11B) { 2656 frm = ieee80211_add_htcap_vendor(frm, bss); 2657 frm = ieee80211_add_htinfo_vendor(frm, bss); 2658 } 2659#ifdef IEEE80211_SUPPORT_SUPERG 2660 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2661 legacy != IEEE80211_SEND_LEGACY_11B) 2662 frm = ieee80211_add_athcaps(frm, bss); 2663#endif 2664 if (vap->iv_appie_proberesp != NULL) 2665 frm = add_appie(frm, vap->iv_appie_proberesp); 2666#ifdef IEEE80211_SUPPORT_MESH 2667 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2668 frm = ieee80211_add_meshid(frm, vap); 2669 frm = ieee80211_add_meshconf(frm, vap); 2670 } 2671#endif 2672 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2673 2674 return m; 2675} 2676 2677/* 2678 * Send a probe response frame to the specified mac address. 2679 * This does not go through the normal mgt frame api so we 2680 * can specify the destination address and re-use the bss node 2681 * for the sta reference. 2682 */ 2683int 2684ieee80211_send_proberesp(struct ieee80211vap *vap, 2685 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2686{ 2687 struct ieee80211_node *bss = vap->iv_bss; 2688 struct ieee80211com *ic = vap->iv_ic; 2689 struct ieee80211_frame *wh; 2690 struct mbuf *m; 2691 int ret; 2692 2693 if (vap->iv_state == IEEE80211_S_CAC) { 2694 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2695 "block %s frame in CAC state", "probe response"); 2696 vap->iv_stats.is_tx_badstate++; 2697 return EIO; /* XXX */ 2698 } 2699 2700 /* 2701 * Hold a reference on the node so it doesn't go away until after 2702 * the xmit is complete all the way in the driver. On error we 2703 * will remove our reference. 2704 */ 2705 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2706 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2707 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2708 ieee80211_node_refcnt(bss)+1); 2709 ieee80211_ref_node(bss); 2710 2711 m = ieee80211_alloc_proberesp(bss, legacy); 2712 if (m == NULL) { 2713 ieee80211_free_node(bss); 2714 return ENOMEM; 2715 } 2716 2717 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2718 KASSERT(m != NULL, ("no room for header")); 2719 2720 IEEE80211_TX_LOCK(ic); 2721 wh = mtod(m, struct ieee80211_frame *); 2722 ieee80211_send_setup(bss, m, 2723 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2724 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2725 /* XXX power management? */ 2726 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2727 2728 M_WME_SETAC(m, WME_AC_BE); 2729 2730 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2731 "send probe resp on channel %u to %s%s\n", 2732 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2733 legacy ? " <legacy>" : ""); 2734 IEEE80211_NODE_STAT(bss, tx_mgmt); 2735 2736 ret = ieee80211_raw_output(vap, bss, m, NULL); 2737 IEEE80211_TX_UNLOCK(ic); 2738 return (ret); 2739} 2740 2741/* 2742 * Allocate and build a RTS (Request To Send) control frame. 2743 */ 2744struct mbuf * 2745ieee80211_alloc_rts(struct ieee80211com *ic, 2746 const uint8_t ra[IEEE80211_ADDR_LEN], 2747 const uint8_t ta[IEEE80211_ADDR_LEN], 2748 uint16_t dur) 2749{ 2750 struct ieee80211_frame_rts *rts; 2751 struct mbuf *m; 2752 2753 /* XXX honor ic_headroom */ 2754 m = m_gethdr(M_NOWAIT, MT_DATA); 2755 if (m != NULL) { 2756 rts = mtod(m, struct ieee80211_frame_rts *); 2757 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2758 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2759 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2760 *(u_int16_t *)rts->i_dur = htole16(dur); 2761 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2762 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2763 2764 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2765 } 2766 return m; 2767} 2768 2769/* 2770 * Allocate and build a CTS (Clear To Send) control frame. 2771 */ 2772struct mbuf * 2773ieee80211_alloc_cts(struct ieee80211com *ic, 2774 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2775{ 2776 struct ieee80211_frame_cts *cts; 2777 struct mbuf *m; 2778 2779 /* XXX honor ic_headroom */ 2780 m = m_gethdr(M_NOWAIT, MT_DATA); 2781 if (m != NULL) { 2782 cts = mtod(m, struct ieee80211_frame_cts *); 2783 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2784 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2785 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2786 *(u_int16_t *)cts->i_dur = htole16(dur); 2787 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2788 2789 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2790 } 2791 return m; 2792} 2793 2794static void 2795ieee80211_tx_mgt_timeout(void *arg) 2796{ 2797 struct ieee80211vap *vap = arg; 2798 2799 IEEE80211_LOCK(vap->iv_ic); 2800 if (vap->iv_state != IEEE80211_S_INIT && 2801 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2802 /* 2803 * NB: it's safe to specify a timeout as the reason here; 2804 * it'll only be used in the right state. 2805 */ 2806 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN, 2807 IEEE80211_SCAN_FAIL_TIMEOUT); 2808 } 2809 IEEE80211_UNLOCK(vap->iv_ic); 2810} 2811 2812/* 2813 * This is the callback set on net80211-sourced transmitted 2814 * authentication request frames. 2815 * 2816 * This does a couple of things: 2817 * 2818 * + If the frame transmitted was a success, it schedules a future 2819 * event which will transition the interface to scan. 2820 * If a state transition _then_ occurs before that event occurs, 2821 * said state transition will cancel this callout. 2822 * 2823 * + If the frame transmit was a failure, it immediately schedules 2824 * the transition back to scan. 2825 */ 2826static void 2827ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2828{ 2829 struct ieee80211vap *vap = ni->ni_vap; 2830 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2831 2832 /* 2833 * Frame transmit completed; arrange timer callback. If 2834 * transmit was successfuly we wait for response. Otherwise 2835 * we arrange an immediate callback instead of doing the 2836 * callback directly since we don't know what state the driver 2837 * is in (e.g. what locks it is holding). This work should 2838 * not be too time-critical and not happen too often so the 2839 * added overhead is acceptable. 2840 * 2841 * XXX what happens if !acked but response shows up before callback? 2842 */ 2843 if (vap->iv_state == ostate) { 2844 callout_reset(&vap->iv_mgtsend, 2845 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2846 ieee80211_tx_mgt_timeout, vap); 2847 } 2848} 2849 2850static void 2851ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2852 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2853{ 2854 struct ieee80211vap *vap = ni->ni_vap; 2855 struct ieee80211com *ic = ni->ni_ic; 2856 struct ieee80211_rateset *rs = &ni->ni_rates; 2857 uint16_t capinfo; 2858 2859 /* 2860 * beacon frame format 2861 * [8] time stamp 2862 * [2] beacon interval 2863 * [2] cabability information 2864 * [tlv] ssid 2865 * [tlv] supported rates 2866 * [3] parameter set (DS) 2867 * [8] CF parameter set (optional) 2868 * [tlv] parameter set (IBSS/TIM) 2869 * [tlv] country (optional) 2870 * [3] power control (optional) 2871 * [5] channel switch announcement (CSA) (optional) 2872 * [tlv] extended rate phy (ERP) 2873 * [tlv] extended supported rates 2874 * [tlv] RSN parameters 2875 * [tlv] HT capabilities 2876 * [tlv] HT information 2877 * XXX Vendor-specific OIDs (e.g. Atheros) 2878 * [tlv] WPA parameters 2879 * [tlv] WME parameters 2880 * [tlv] Vendor OUI HT capabilities (optional) 2881 * [tlv] Vendor OUI HT information (optional) 2882 * [tlv] Atheros capabilities (optional) 2883 * [tlv] TDMA parameters (optional) 2884 * [tlv] Mesh ID (MBSS) 2885 * [tlv] Mesh Conf (MBSS) 2886 * [tlv] application data (optional) 2887 */ 2888 2889 memset(bo, 0, sizeof(*bo)); 2890 2891 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2892 frm += 8; 2893 *(uint16_t *)frm = htole16(ni->ni_intval); 2894 frm += 2; 2895 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2896 bo->bo_caps = (uint16_t *)frm; 2897 *(uint16_t *)frm = htole16(capinfo); 2898 frm += 2; 2899 *frm++ = IEEE80211_ELEMID_SSID; 2900 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2901 *frm++ = ni->ni_esslen; 2902 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2903 frm += ni->ni_esslen; 2904 } else 2905 *frm++ = 0; 2906 frm = ieee80211_add_rates(frm, rs); 2907 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2908 *frm++ = IEEE80211_ELEMID_DSPARMS; 2909 *frm++ = 1; 2910 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2911 } 2912 if (ic->ic_flags & IEEE80211_F_PCF) { 2913 bo->bo_cfp = frm; 2914 frm = ieee80211_add_cfparms(frm, ic); 2915 } 2916 bo->bo_tim = frm; 2917 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2918 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2919 *frm++ = 2; 2920 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2921 bo->bo_tim_len = 0; 2922 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2923 vap->iv_opmode == IEEE80211_M_MBSS) { 2924 /* TIM IE is the same for Mesh and Hostap */ 2925 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2926 2927 tie->tim_ie = IEEE80211_ELEMID_TIM; 2928 tie->tim_len = 4; /* length */ 2929 tie->tim_count = 0; /* DTIM count */ 2930 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2931 tie->tim_bitctl = 0; /* bitmap control */ 2932 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2933 frm += sizeof(struct ieee80211_tim_ie); 2934 bo->bo_tim_len = 1; 2935 } 2936 bo->bo_tim_trailer = frm; 2937 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2938 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2939 frm = ieee80211_add_countryie(frm, ic); 2940 if (vap->iv_flags & IEEE80211_F_DOTH) { 2941 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2942 frm = ieee80211_add_powerconstraint(frm, vap); 2943 bo->bo_csa = frm; 2944 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2945 frm = ieee80211_add_csa(frm, vap); 2946 } else 2947 bo->bo_csa = frm; 2948 2949 if (vap->iv_flags & IEEE80211_F_DOTH) { 2950 bo->bo_quiet = frm; 2951 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2952 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2953 if (vap->iv_quiet) 2954 frm = ieee80211_add_quiet(frm,vap); 2955 } 2956 } else 2957 bo->bo_quiet = frm; 2958 2959 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2960 bo->bo_erp = frm; 2961 frm = ieee80211_add_erp(frm, ic); 2962 } 2963 frm = ieee80211_add_xrates(frm, rs); 2964 frm = ieee80211_add_rsn(frm, vap); 2965 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2966 frm = ieee80211_add_htcap(frm, ni); 2967 bo->bo_htinfo = frm; 2968 frm = ieee80211_add_htinfo(frm, ni); 2969 } 2970 frm = ieee80211_add_wpa(frm, vap); 2971 if (vap->iv_flags & IEEE80211_F_WME) { 2972 bo->bo_wme = frm; 2973 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2974 } 2975 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2976 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2977 frm = ieee80211_add_htcap_vendor(frm, ni); 2978 frm = ieee80211_add_htinfo_vendor(frm, ni); 2979 } 2980#ifdef IEEE80211_SUPPORT_SUPERG 2981 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2982 bo->bo_ath = frm; 2983 frm = ieee80211_add_athcaps(frm, ni); 2984 } 2985#endif 2986#ifdef IEEE80211_SUPPORT_TDMA 2987 if (vap->iv_caps & IEEE80211_C_TDMA) { 2988 bo->bo_tdma = frm; 2989 frm = ieee80211_add_tdma(frm, vap); 2990 } 2991#endif 2992 if (vap->iv_appie_beacon != NULL) { 2993 bo->bo_appie = frm; 2994 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2995 frm = add_appie(frm, vap->iv_appie_beacon); 2996 } 2997#ifdef IEEE80211_SUPPORT_MESH 2998 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2999 frm = ieee80211_add_meshid(frm, vap); 3000 bo->bo_meshconf = frm; 3001 frm = ieee80211_add_meshconf(frm, vap); 3002 } 3003#endif 3004 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 3005 bo->bo_csa_trailer_len = frm - bo->bo_csa; 3006 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 3007} 3008 3009/* 3010 * Allocate a beacon frame and fillin the appropriate bits. 3011 */ 3012struct mbuf * 3013ieee80211_beacon_alloc(struct ieee80211_node *ni, 3014 struct ieee80211_beacon_offsets *bo) 3015{ 3016 struct ieee80211vap *vap = ni->ni_vap; 3017 struct ieee80211com *ic = ni->ni_ic; 3018 struct ifnet *ifp = vap->iv_ifp; 3019 struct ieee80211_frame *wh; 3020 struct mbuf *m; 3021 int pktlen; 3022 uint8_t *frm; 3023 3024 /* 3025 * beacon frame format 3026 * [8] time stamp 3027 * [2] beacon interval 3028 * [2] cabability information 3029 * [tlv] ssid 3030 * [tlv] supported rates 3031 * [3] parameter set (DS) 3032 * [8] CF parameter set (optional) 3033 * [tlv] parameter set (IBSS/TIM) 3034 * [tlv] country (optional) 3035 * [3] power control (optional) 3036 * [5] channel switch announcement (CSA) (optional) 3037 * [tlv] extended rate phy (ERP) 3038 * [tlv] extended supported rates 3039 * [tlv] RSN parameters 3040 * [tlv] HT capabilities 3041 * [tlv] HT information 3042 * [tlv] Vendor OUI HT capabilities (optional) 3043 * [tlv] Vendor OUI HT information (optional) 3044 * XXX Vendor-specific OIDs (e.g. Atheros) 3045 * [tlv] WPA parameters 3046 * [tlv] WME parameters 3047 * [tlv] TDMA parameters (optional) 3048 * [tlv] Mesh ID (MBSS) 3049 * [tlv] Mesh Conf (MBSS) 3050 * [tlv] application data (optional) 3051 * NB: we allocate the max space required for the TIM bitmap. 3052 * XXX how big is this? 3053 */ 3054 pktlen = 8 /* time stamp */ 3055 + sizeof(uint16_t) /* beacon interval */ 3056 + sizeof(uint16_t) /* capabilities */ 3057 + 2 + ni->ni_esslen /* ssid */ 3058 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 3059 + 2 + 1 /* DS parameters */ 3060 + 2 + 6 /* CF parameters */ 3061 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 3062 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 3063 + 2 + 1 /* power control */ 3064 + sizeof(struct ieee80211_csa_ie) /* CSA */ 3065 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 3066 + 2 + 1 /* ERP */ 3067 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 3068 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 3069 2*sizeof(struct ieee80211_ie_wpa) : 0) 3070 /* XXX conditional? */ 3071 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 3072 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 3073 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 3074 sizeof(struct ieee80211_wme_param) : 0) 3075#ifdef IEEE80211_SUPPORT_SUPERG 3076 + sizeof(struct ieee80211_ath_ie) /* ATH */ 3077#endif 3078#ifdef IEEE80211_SUPPORT_TDMA 3079 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 3080 sizeof(struct ieee80211_tdma_param) : 0) 3081#endif 3082#ifdef IEEE80211_SUPPORT_MESH 3083 + 2 + ni->ni_meshidlen 3084 + sizeof(struct ieee80211_meshconf_ie) 3085#endif 3086 + IEEE80211_MAX_APPIE 3087 ; 3088 m = ieee80211_getmgtframe(&frm, 3089 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 3090 if (m == NULL) { 3091 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 3092 "%s: cannot get buf; size %u\n", __func__, pktlen); 3093 vap->iv_stats.is_tx_nobuf++; 3094 return NULL; 3095 } 3096 ieee80211_beacon_construct(m, frm, bo, ni); 3097 3098 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 3099 KASSERT(m != NULL, ("no space for 802.11 header?")); 3100 wh = mtod(m, struct ieee80211_frame *); 3101 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 3102 IEEE80211_FC0_SUBTYPE_BEACON; 3103 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 3104 *(uint16_t *)wh->i_dur = 0; 3105 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 3106 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 3107 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 3108 *(uint16_t *)wh->i_seq = 0; 3109 3110 return m; 3111} 3112 3113/* 3114 * Update the dynamic parts of a beacon frame based on the current state. 3115 */ 3116int 3117ieee80211_beacon_update(struct ieee80211_node *ni, 3118 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 3119{ 3120 struct ieee80211vap *vap = ni->ni_vap; 3121 struct ieee80211com *ic = ni->ni_ic; 3122 int len_changed = 0; 3123 uint16_t capinfo; 3124 struct ieee80211_frame *wh; 3125 ieee80211_seq seqno; 3126 3127 IEEE80211_LOCK(ic); 3128 /* 3129 * Handle 11h channel change when we've reached the count. 3130 * We must recalculate the beacon frame contents to account 3131 * for the new channel. Note we do this only for the first 3132 * vap that reaches this point; subsequent vaps just update 3133 * their beacon state to reflect the recalculated channel. 3134 */ 3135 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3136 vap->iv_csa_count == ic->ic_csa_count) { 3137 vap->iv_csa_count = 0; 3138 /* 3139 * Effect channel change before reconstructing the beacon 3140 * frame contents as many places reference ni_chan. 3141 */ 3142 if (ic->ic_csa_newchan != NULL) 3143 ieee80211_csa_completeswitch(ic); 3144 /* 3145 * NB: ieee80211_beacon_construct clears all pending 3146 * updates in bo_flags so we don't need to explicitly 3147 * clear IEEE80211_BEACON_CSA. 3148 */ 3149 ieee80211_beacon_construct(m, 3150 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 3151 3152 /* XXX do WME aggressive mode processing? */ 3153 IEEE80211_UNLOCK(ic); 3154 return 1; /* just assume length changed */ 3155 } 3156 3157 wh = mtod(m, struct ieee80211_frame *); 3158 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3159 *(uint16_t *)&wh->i_seq[0] = 3160 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3161 M_SEQNO_SET(m, seqno); 3162 3163 /* XXX faster to recalculate entirely or just changes? */ 3164 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3165 *bo->bo_caps = htole16(capinfo); 3166 3167 if (vap->iv_flags & IEEE80211_F_WME) { 3168 struct ieee80211_wme_state *wme = &ic->ic_wme; 3169 3170 /* 3171 * Check for agressive mode change. When there is 3172 * significant high priority traffic in the BSS 3173 * throttle back BE traffic by using conservative 3174 * parameters. Otherwise BE uses agressive params 3175 * to optimize performance of legacy/non-QoS traffic. 3176 */ 3177 if (wme->wme_flags & WME_F_AGGRMODE) { 3178 if (wme->wme_hipri_traffic > 3179 wme->wme_hipri_switch_thresh) { 3180 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3181 "%s: traffic %u, disable aggressive mode\n", 3182 __func__, wme->wme_hipri_traffic); 3183 wme->wme_flags &= ~WME_F_AGGRMODE; 3184 ieee80211_wme_updateparams_locked(vap); 3185 wme->wme_hipri_traffic = 3186 wme->wme_hipri_switch_hysteresis; 3187 } else 3188 wme->wme_hipri_traffic = 0; 3189 } else { 3190 if (wme->wme_hipri_traffic <= 3191 wme->wme_hipri_switch_thresh) { 3192 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3193 "%s: traffic %u, enable aggressive mode\n", 3194 __func__, wme->wme_hipri_traffic); 3195 wme->wme_flags |= WME_F_AGGRMODE; 3196 ieee80211_wme_updateparams_locked(vap); 3197 wme->wme_hipri_traffic = 0; 3198 } else 3199 wme->wme_hipri_traffic = 3200 wme->wme_hipri_switch_hysteresis; 3201 } 3202 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3203 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3204 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3205 } 3206 } 3207 3208 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3209 ieee80211_ht_update_beacon(vap, bo); 3210 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3211 } 3212#ifdef IEEE80211_SUPPORT_TDMA 3213 if (vap->iv_caps & IEEE80211_C_TDMA) { 3214 /* 3215 * NB: the beacon is potentially updated every TBTT. 3216 */ 3217 ieee80211_tdma_update_beacon(vap, bo); 3218 } 3219#endif 3220#ifdef IEEE80211_SUPPORT_MESH 3221 if (vap->iv_opmode == IEEE80211_M_MBSS) 3222 ieee80211_mesh_update_beacon(vap, bo); 3223#endif 3224 3225 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3226 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3227 struct ieee80211_tim_ie *tie = 3228 (struct ieee80211_tim_ie *) bo->bo_tim; 3229 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3230 u_int timlen, timoff, i; 3231 /* 3232 * ATIM/DTIM needs updating. If it fits in the 3233 * current space allocated then just copy in the 3234 * new bits. Otherwise we need to move any trailing 3235 * data to make room. Note that we know there is 3236 * contiguous space because ieee80211_beacon_allocate 3237 * insures there is space in the mbuf to write a 3238 * maximal-size virtual bitmap (based on iv_max_aid). 3239 */ 3240 /* 3241 * Calculate the bitmap size and offset, copy any 3242 * trailer out of the way, and then copy in the 3243 * new bitmap and update the information element. 3244 * Note that the tim bitmap must contain at least 3245 * one byte and any offset must be even. 3246 */ 3247 if (vap->iv_ps_pending != 0) { 3248 timoff = 128; /* impossibly large */ 3249 for (i = 0; i < vap->iv_tim_len; i++) 3250 if (vap->iv_tim_bitmap[i]) { 3251 timoff = i &~ 1; 3252 break; 3253 } 3254 KASSERT(timoff != 128, ("tim bitmap empty!")); 3255 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3256 if (vap->iv_tim_bitmap[i]) 3257 break; 3258 timlen = 1 + (i - timoff); 3259 } else { 3260 timoff = 0; 3261 timlen = 1; 3262 } 3263 if (timlen != bo->bo_tim_len) { 3264 /* copy up/down trailer */ 3265 int adjust = tie->tim_bitmap+timlen 3266 - bo->bo_tim_trailer; 3267 ovbcopy(bo->bo_tim_trailer, 3268 bo->bo_tim_trailer+adjust, 3269 bo->bo_tim_trailer_len); 3270 bo->bo_tim_trailer += adjust; 3271 bo->bo_erp += adjust; 3272 bo->bo_htinfo += adjust; 3273#ifdef IEEE80211_SUPPORT_SUPERG 3274 bo->bo_ath += adjust; 3275#endif 3276#ifdef IEEE80211_SUPPORT_TDMA 3277 bo->bo_tdma += adjust; 3278#endif 3279#ifdef IEEE80211_SUPPORT_MESH 3280 bo->bo_meshconf += adjust; 3281#endif 3282 bo->bo_appie += adjust; 3283 bo->bo_wme += adjust; 3284 bo->bo_csa += adjust; 3285 bo->bo_quiet += adjust; 3286 bo->bo_tim_len = timlen; 3287 3288 /* update information element */ 3289 tie->tim_len = 3 + timlen; 3290 tie->tim_bitctl = timoff; 3291 len_changed = 1; 3292 } 3293 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3294 bo->bo_tim_len); 3295 3296 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3297 3298 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3299 "%s: TIM updated, pending %u, off %u, len %u\n", 3300 __func__, vap->iv_ps_pending, timoff, timlen); 3301 } 3302 /* count down DTIM period */ 3303 if (tie->tim_count == 0) 3304 tie->tim_count = tie->tim_period - 1; 3305 else 3306 tie->tim_count--; 3307 /* update state for buffered multicast frames on DTIM */ 3308 if (mcast && tie->tim_count == 0) 3309 tie->tim_bitctl |= 1; 3310 else 3311 tie->tim_bitctl &= ~1; 3312 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3313 struct ieee80211_csa_ie *csa = 3314 (struct ieee80211_csa_ie *) bo->bo_csa; 3315 3316 /* 3317 * Insert or update CSA ie. If we're just starting 3318 * to count down to the channel switch then we need 3319 * to insert the CSA ie. Otherwise we just need to 3320 * drop the count. The actual change happens above 3321 * when the vap's count reaches the target count. 3322 */ 3323 if (vap->iv_csa_count == 0) { 3324 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3325 bo->bo_erp += sizeof(*csa); 3326 bo->bo_htinfo += sizeof(*csa); 3327 bo->bo_wme += sizeof(*csa); 3328#ifdef IEEE80211_SUPPORT_SUPERG 3329 bo->bo_ath += sizeof(*csa); 3330#endif 3331#ifdef IEEE80211_SUPPORT_TDMA 3332 bo->bo_tdma += sizeof(*csa); 3333#endif 3334#ifdef IEEE80211_SUPPORT_MESH 3335 bo->bo_meshconf += sizeof(*csa); 3336#endif 3337 bo->bo_appie += sizeof(*csa); 3338 bo->bo_csa_trailer_len += sizeof(*csa); 3339 bo->bo_quiet += sizeof(*csa); 3340 bo->bo_tim_trailer_len += sizeof(*csa); 3341 m->m_len += sizeof(*csa); 3342 m->m_pkthdr.len += sizeof(*csa); 3343 3344 ieee80211_add_csa(bo->bo_csa, vap); 3345 } else 3346 csa->csa_count--; 3347 vap->iv_csa_count++; 3348 /* NB: don't clear IEEE80211_BEACON_CSA */ 3349 } 3350 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3351 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3352 if (vap->iv_quiet) 3353 ieee80211_add_quiet(bo->bo_quiet, vap); 3354 } 3355 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3356 /* 3357 * ERP element needs updating. 3358 */ 3359 (void) ieee80211_add_erp(bo->bo_erp, ic); 3360 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3361 } 3362#ifdef IEEE80211_SUPPORT_SUPERG 3363 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3364 ieee80211_add_athcaps(bo->bo_ath, ni); 3365 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3366 } 3367#endif 3368 } 3369 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3370 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3371 int aielen; 3372 uint8_t *frm; 3373 3374 aielen = 0; 3375 if (aie != NULL) 3376 aielen += aie->ie_len; 3377 if (aielen != bo->bo_appie_len) { 3378 /* copy up/down trailer */ 3379 int adjust = aielen - bo->bo_appie_len; 3380 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3381 bo->bo_tim_trailer_len); 3382 bo->bo_tim_trailer += adjust; 3383 bo->bo_appie += adjust; 3384 bo->bo_appie_len = aielen; 3385 3386 len_changed = 1; 3387 } 3388 frm = bo->bo_appie; 3389 if (aie != NULL) 3390 frm = add_appie(frm, aie); 3391 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3392 } 3393 IEEE80211_UNLOCK(ic); 3394 3395 return len_changed; 3396} 3397 3398/* 3399 * Do Ethernet-LLC encapsulation for each payload in a fast frame 3400 * tunnel encapsulation. The frame is assumed to have an Ethernet 3401 * header at the front that must be stripped before prepending the 3402 * LLC followed by the Ethernet header passed in (with an Ethernet 3403 * type that specifies the payload size). 3404 */ 3405struct mbuf * 3406ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 3407 const struct ether_header *eh) 3408{ 3409 struct llc *llc; 3410 uint16_t payload; 3411 3412 /* XXX optimize by combining m_adj+M_PREPEND */ 3413 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 3414 llc = mtod(m, struct llc *); 3415 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 3416 llc->llc_control = LLC_UI; 3417 llc->llc_snap.org_code[0] = 0; 3418 llc->llc_snap.org_code[1] = 0; 3419 llc->llc_snap.org_code[2] = 0; 3420 llc->llc_snap.ether_type = eh->ether_type; 3421 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 3422 3423 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 3424 if (m == NULL) { /* XXX cannot happen */ 3425 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 3426 "%s: no space for ether_header\n", __func__); 3427 vap->iv_stats.is_tx_nobuf++; 3428 return NULL; 3429 } 3430 ETHER_HEADER_COPY(mtod(m, void *), eh); 3431 mtod(m, struct ether_header *)->ether_type = htons(payload); 3432 return m; 3433} 3434 3435/* 3436 * Complete an mbuf transmission. 3437 * 3438 * For now, this simply processes a completed frame after the 3439 * driver has completed it's transmission and/or retransmission. 3440 * It assumes the frame is an 802.11 encapsulated frame. 3441 * 3442 * Later on it will grow to become the exit path for a given frame 3443 * from the driver and, depending upon how it's been encapsulated 3444 * and already transmitted, it may end up doing A-MPDU retransmission, 3445 * power save requeuing, etc. 3446 * 3447 * In order for the above to work, the driver entry point to this 3448 * must not hold any driver locks. Thus, the driver needs to delay 3449 * any actual mbuf completion until it can release said locks. 3450 * 3451 * This frees the mbuf and if the mbuf has a node reference, 3452 * the node reference will be freed. 3453 */ 3454void 3455ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status) 3456{ 3457 3458 if (ni != NULL) { 3459 if (m->m_flags & M_TXCB) 3460 ieee80211_process_callback(ni, m, status); 3461 ieee80211_free_node(ni); 3462 } 3463 m_freem(m); 3464} 3465