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("$FreeBSD$"); 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/vlan/if_vlan_var.h> 49 50 #if defined(__DragonFly__) 51 #include <net/ifq_var.h> 52 #endif 53 54 #include <netproto/802_11/ieee80211_var.h> 55 #include <netproto/802_11/ieee80211_regdomain.h> 56 #ifdef IEEE80211_SUPPORT_SUPERG 57 #include <netproto/802_11/ieee80211_superg.h> 58 #endif 59 #ifdef IEEE80211_SUPPORT_TDMA 60 #include <netproto/802_11/ieee80211_tdma.h> 61 #endif 62 #include <netproto/802_11/ieee80211_wds.h> 63 #include <netproto/802_11/ieee80211_mesh.h> 64 65 #if defined(INET) || defined(INET6) 66 #include <netinet/in.h> 67 #endif 68 69 #ifdef INET 70 #include <netinet/if_ether.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/ip.h> 73 #endif 74 #ifdef INET6 75 #include <netinet/ip6.h> 76 #endif 77 78 /*#include <security/mac/mac_framework.h>*/ 79 80 #define ETHER_HEADER_COPY(dst, src) \ 81 memcpy(dst, src, sizeof(struct ether_header)) 82 83 /* unalligned little endian access */ 84 #define LE_WRITE_2(p, v) do { \ 85 ((uint8_t *)(p))[0] = (v) & 0xff; \ 86 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 87 } while (0) 88 #define LE_WRITE_4(p, v) do { \ 89 ((uint8_t *)(p))[0] = (v) & 0xff; \ 90 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 91 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 92 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 93 } while (0) 94 95 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 96 u_int hdrsize, u_int ciphdrsize, u_int mtu); 97 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 98 99 #ifdef IEEE80211_DEBUG 100 /* 101 * Decide if an outbound management frame should be 102 * printed when debugging is enabled. This filters some 103 * of the less interesting frames that come frequently 104 * (e.g. beacons). 105 */ 106 static __inline int 107 doprint(struct ieee80211vap *vap, int subtype) 108 { 109 switch (subtype) { 110 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 111 return (vap->iv_opmode == IEEE80211_M_IBSS); 112 } 113 return 1; 114 } 115 #endif 116 117 /* 118 * Transmit a frame to the given destination on the given VAP. 119 * 120 * It's up to the caller to figure out the details of who this 121 * is going to and resolving the node. 122 * 123 * This routine takes care of queuing it for power save, 124 * A-MPDU state stuff, fast-frames state stuff, encapsulation 125 * if required, then passing it up to the driver layer. 126 * 127 * This routine (for now) consumes the mbuf and frees the node 128 * reference; it ideally will return a TX status which reflects 129 * whether the mbuf was consumed or not, so the caller can 130 * free the mbuf (if appropriate) and the node reference (again, 131 * if appropriate.) 132 */ 133 int 134 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m, 135 struct ieee80211_node *ni) 136 { 137 struct ieee80211com *ic = vap->iv_ic; 138 struct ifnet *ifp = vap->iv_ifp; 139 int error; 140 141 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 142 (m->m_flags & M_PWR_SAV) == 0) { 143 /* 144 * Station in power save mode; pass the frame 145 * to the 802.11 layer and continue. We'll get 146 * the frame back when the time is right. 147 * XXX lose WDS vap linkage? 148 */ 149 (void) ieee80211_pwrsave(ni, m); 150 ieee80211_free_node(ni); 151 152 /* 153 * We queued it fine, so tell the upper layer 154 * that we consumed it. 155 */ 156 return (0); 157 } 158 /* calculate priority so drivers can find the tx queue */ 159 if (ieee80211_classify(ni, m)) { 160 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 161 ni->ni_macaddr, NULL, 162 "%s", "classification failure"); 163 vap->iv_stats.is_tx_classify++; 164 IFNET_STAT_INC(ifp, oerrors, 1); 165 m_freem(m); 166 ieee80211_free_node(ni); 167 168 /* XXX better status? */ 169 return (0); 170 } 171 /* 172 * Stash the node pointer. Note that we do this after 173 * any call to ieee80211_dwds_mcast because that code 174 * uses any existing value for rcvif to identify the 175 * interface it (might have been) received on. 176 */ 177 m->m_pkthdr.rcvif = (void *)ni; 178 179 BPF_MTAP(ifp, m); /* 802.3 tx */ 180 181 /* 182 * Check if A-MPDU tx aggregation is setup or if we 183 * should try to enable it. The sta must be associated 184 * with HT and A-MPDU enabled for use. When the policy 185 * routine decides we should enable A-MPDU we issue an 186 * ADDBA request and wait for a reply. The frame being 187 * encapsulated will go out w/o using A-MPDU, or possibly 188 * it might be collected by the driver and held/retransmit. 189 * The default ic_ampdu_enable routine handles staggering 190 * ADDBA requests in case the receiver NAK's us or we are 191 * otherwise unable to establish a BA stream. 192 */ 193 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 194 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 195 (m->m_flags & M_EAPOL) == 0) { 196 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 197 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 198 199 ieee80211_txampdu_count_packet(tap); 200 if (IEEE80211_AMPDU_RUNNING(tap)) { 201 /* 202 * Operational, mark frame for aggregation. 203 * 204 * XXX do tx aggregation here 205 */ 206 m->m_flags |= M_AMPDU_MPDU; 207 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 208 ic->ic_ampdu_enable(ni, tap)) { 209 /* 210 * Not negotiated yet, request service. 211 */ 212 ieee80211_ampdu_request(ni, tap); 213 /* XXX hold frame for reply? */ 214 } 215 } 216 217 #ifdef IEEE80211_SUPPORT_SUPERG 218 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 219 m = ieee80211_ff_check(ni, m); 220 if (m == NULL) { 221 /* NB: any ni ref held on stageq */ 222 return (0); 223 } 224 } 225 #endif /* IEEE80211_SUPPORT_SUPERG */ 226 227 /* 228 * Grab the TX lock - serialise the TX process from this 229 * point (where TX state is being checked/modified) 230 * through to driver queue. 231 */ 232 IEEE80211_TX_LOCK(ic); 233 234 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 235 /* 236 * Encapsulate the packet in prep for transmission. 237 */ 238 m = ieee80211_encap(vap, ni, m); 239 if (m == NULL) { 240 /* NB: stat+msg handled in ieee80211_encap */ 241 IEEE80211_TX_UNLOCK(ic); 242 ieee80211_free_node(ni); 243 /* XXX better status? */ 244 return (ENOBUFS); 245 } 246 } 247 error = ieee80211_parent_xmitpkt(ic, m); 248 249 /* 250 * Unlock at this point - no need to hold it across 251 * ieee80211_free_node() (ie, the comlock) 252 */ 253 IEEE80211_TX_UNLOCK(ic); 254 if (error != 0) { 255 /* NB: IFQ_HANDOFF reclaims mbuf */ 256 ieee80211_free_node(ni); 257 } else { 258 IFNET_STAT_INC(ifp, opackets, 1); 259 } 260 ic->ic_lastdata = ticks; 261 262 return (0); 263 } 264 265 266 267 /* 268 * Send the given mbuf through the given vap. 269 * 270 * This consumes the mbuf regardless of whether the transmit 271 * was successful or not. 272 * 273 * This does none of the initial checks that ieee80211_start() 274 * does (eg CAC timeout, interface wakeup) - the caller must 275 * do this first. 276 */ 277 static int 278 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 279 { 280 #define IS_DWDS(vap) \ 281 (vap->iv_opmode == IEEE80211_M_WDS && \ 282 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 283 struct ieee80211com *ic = vap->iv_ic; 284 struct ifnet *ifp = vap->iv_ifp; 285 struct ieee80211_node *ni; 286 struct ether_header *eh; 287 288 /* 289 * Cancel any background scan. 290 */ 291 if (ic->ic_flags & IEEE80211_F_SCAN) 292 ieee80211_cancel_anyscan(vap); 293 /* 294 * Find the node for the destination so we can do 295 * things like power save and fast frames aggregation. 296 * 297 * NB: past this point various code assumes the first 298 * mbuf has the 802.3 header present (and contiguous). 299 */ 300 ni = NULL; 301 if (m->m_len < sizeof(struct ether_header) && 302 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 303 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 304 "discard frame, %s\n", "m_pullup failed"); 305 vap->iv_stats.is_tx_nobuf++; /* XXX */ 306 IFNET_STAT_INC(ifp, oerrors, 1); 307 return (ENOBUFS); 308 } 309 eh = mtod(m, struct ether_header *); 310 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 311 if (IS_DWDS(vap)) { 312 /* 313 * Only unicast frames from the above go out 314 * DWDS vaps; multicast frames are handled by 315 * dispatching the frame as it comes through 316 * the AP vap (see below). 317 */ 318 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 319 eh->ether_dhost, "mcast", "%s", "on DWDS"); 320 vap->iv_stats.is_dwds_mcast++; 321 m_freem(m); 322 /* XXX better status? */ 323 return (ENOBUFS); 324 } 325 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 326 /* 327 * Spam DWDS vap's w/ multicast traffic. 328 */ 329 /* XXX only if dwds in use? */ 330 /* XXX better status? */ 331 return (ENOBUFS); 332 } 333 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 334 /* 335 * Spam DWDS vap's w/ multicast traffic. 336 */ 337 /* XXX only if dwds in use? */ 338 ieee80211_dwds_mcast(vap, m); 339 ieee80211_dwds_mcast(vap, m); 340 } 341 } 342 #ifdef IEEE80211_SUPPORT_MESH 343 if (vap->iv_opmode != IEEE80211_M_MBSS) { 344 #endif 345 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 346 if (ni == NULL) { 347 /* NB: ieee80211_find_txnode does stat+msg */ 348 IFNET_STAT_INC(ifp, oerrors, 1); 349 m_freem(m); 350 /* XXX better status? */ 351 return (ENOBUFS); 352 } 353 if (ni->ni_associd == 0 && 354 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 355 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 356 eh->ether_dhost, NULL, 357 "sta not associated (type 0x%04x)", 358 htons(eh->ether_type)); 359 vap->iv_stats.is_tx_notassoc++; 360 IFNET_STAT_INC(ifp, oerrors, 1); 361 m_freem(m); 362 ieee80211_free_node(ni); 363 /* XXX better status? */ 364 return (ENOBUFS); 365 } 366 #ifdef IEEE80211_SUPPORT_MESH 367 } else { 368 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 369 /* 370 * Proxy station only if configured. 371 */ 372 if (!ieee80211_mesh_isproxyena(vap)) { 373 IEEE80211_DISCARD_MAC(vap, 374 IEEE80211_MSG_OUTPUT | 375 IEEE80211_MSG_MESH, 376 eh->ether_dhost, NULL, 377 "%s", "proxy not enabled"); 378 vap->iv_stats.is_mesh_notproxy++; 379 IFNET_STAT_INC(ifp, oerrors, 1); 380 m_freem(m); 381 /* XXX better status? */ 382 return (ENOBUFS); 383 } 384 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 385 "forward frame from DS SA(%s), DA(%s)\n", 386 ether_sprintf(eh->ether_shost), 387 ether_sprintf(eh->ether_dhost)); 388 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 389 } 390 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 391 if (ni == NULL) { 392 /* 393 * NB: ieee80211_mesh_discover holds/disposes 394 * frame (e.g. queueing on path discovery). 395 */ 396 IFNET_STAT_INC(ifp, oerrors, 1); 397 /* XXX better status? */ 398 return (ENOBUFS); 399 } 400 } 401 #endif 402 403 /* 404 * We've resolved the sender, so attempt to transmit it. 405 */ 406 407 if (vap->iv_state == IEEE80211_S_SLEEP) { 408 /* 409 * In power save; queue frame and then wakeup device 410 * for transmit. 411 */ 412 ic->ic_lastdata = ticks; 413 (void) ieee80211_pwrsave(ni, m); 414 ieee80211_free_node(ni); 415 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 416 return (0); 417 } 418 419 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0) 420 return (ENOBUFS); 421 return (0); 422 #undef IS_DWDS 423 } 424 425 /* 426 * Start method for vap's. All packets from the stack come 427 * through here. We handle common processing of the packets 428 * before dispatching them to the underlying device. 429 * 430 * if_transmit() requires that the mbuf be consumed by this call 431 * regardless of the return condition. 432 */ 433 434 #if defined(__DragonFly__) 435 436 void 437 ieee80211_vap_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 438 { 439 struct ieee80211vap *vap = ifp->if_softc; 440 struct ieee80211com *ic = vap->iv_ic; 441 struct ifnet *parent = ic->ic_ifp; 442 struct mbuf *m = NULL; 443 444 /* NB: parent must be up and running */ 445 if (!IFNET_IS_UP_RUNNING(parent)) { 446 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 447 "%s: ignore queue, parent %s not up+running\n", 448 __func__, parent->if_xname); 449 /* XXX stat */ 450 /*m_freem(m);*/ 451 /*return (EINVAL);*/ 452 return; 453 } 454 455 wlan_assert_serialized(); 456 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 457 458 /* 459 * No data frames go out unless we're running. 460 * Note in particular this covers CAC and CSA 461 * states (though maybe we should check muting 462 * for CSA). 463 */ 464 if (vap->iv_state != IEEE80211_S_RUN && 465 vap->iv_state != IEEE80211_S_SLEEP) { 466 IEEE80211_LOCK(ic); 467 /* re-check under the com lock to avoid races */ 468 if (vap->iv_state != IEEE80211_S_RUN && 469 vap->iv_state != IEEE80211_S_SLEEP) { 470 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 471 "%s: ignore queue, in %s state\n", 472 __func__, ieee80211_state_name[vap->iv_state]); 473 vap->iv_stats.is_tx_badstate++; 474 IEEE80211_UNLOCK(ic); 475 ifsq_set_oactive(ifsq); 476 /*m_freem(m);*/ 477 /* return (EINVAL); */ 478 return; 479 } 480 IEEE80211_UNLOCK(ic); 481 } 482 483 wlan_serialize_exit(); 484 for (;;) { 485 m = ifsq_dequeue(ifsq); 486 if (m == NULL) 487 break; 488 489 /* 490 * Sanitize mbuf flags for net80211 use. We cannot 491 * clear M_PWR_SAV or M_MORE_DATA because these may 492 * be set for frames that are re-submitted from the 493 * power save queue. 494 * 495 * NB: This must be done before ieee80211_classify as 496 * it marks EAPOL in frames with M_EAPOL. 497 */ 498 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 499 500 /* 501 * Bump to the packet transmission path. 502 * The mbuf will be consumed here. 503 */ 504 ieee80211_start_pkt(vap, m); 505 } 506 wlan_serialize_enter(); 507 } 508 509 #else 510 511 int 512 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m) 513 { 514 struct ieee80211vap *vap = ifp->if_softc; 515 struct ieee80211com *ic = vap->iv_ic; 516 struct ifnet *parent = ic->ic_ifp; 517 518 /* NB: parent must be up and running */ 519 if (!IFNET_IS_UP_RUNNING(parent)) { 520 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 521 "%s: ignore queue, parent %s not up+running\n", 522 __func__, parent->if_xname); 523 /* XXX stat */ 524 m_freem(m); 525 return (EINVAL); 526 } 527 528 /* 529 * No data frames go out unless we're running. 530 * Note in particular this covers CAC and CSA 531 * states (though maybe we should check muting 532 * for CSA). 533 */ 534 if (vap->iv_state != IEEE80211_S_RUN && 535 vap->iv_state != IEEE80211_S_SLEEP) { 536 IEEE80211_LOCK(ic); 537 /* re-check under the com lock to avoid races */ 538 if (vap->iv_state != IEEE80211_S_RUN && 539 vap->iv_state != IEEE80211_S_SLEEP) { 540 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 541 "%s: ignore queue, in %s state\n", 542 __func__, ieee80211_state_name[vap->iv_state]); 543 vap->iv_stats.is_tx_badstate++; 544 IEEE80211_UNLOCK(ic); 545 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 546 m_freem(m); 547 return (EINVAL); 548 } 549 IEEE80211_UNLOCK(ic); 550 } 551 552 /* 553 * Sanitize mbuf flags for net80211 use. We cannot 554 * clear M_PWR_SAV or M_MORE_DATA because these may 555 * be set for frames that are re-submitted from the 556 * power save queue. 557 * 558 * NB: This must be done before ieee80211_classify as 559 * it marks EAPOL in frames with M_EAPOL. 560 */ 561 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 562 563 /* 564 * Bump to the packet transmission path. 565 * The mbuf will be consumed here. 566 */ 567 return (ieee80211_start_pkt(vap, m)); 568 } 569 570 void 571 ieee80211_vap_qflush(struct ifnet *ifp) 572 { 573 574 /* Empty for now */ 575 } 576 577 #endif 578 579 /* 580 * 802.11 raw output routine. 581 * 582 * XXX TODO: this (and other send routines) should correctly 583 * XXX keep the pwr mgmt bit set if it decides to call into the 584 * XXX driver to send a frame whilst the state is SLEEP. 585 * 586 * Otherwise the peer may decide that we're awake and flood us 587 * with traffic we are still too asleep to receive! 588 */ 589 int 590 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 591 struct mbuf *m, const struct ieee80211_bpf_params *params) 592 { 593 struct ieee80211com *ic = vap->iv_ic; 594 595 return (ic->ic_raw_xmit(ni, m, params)); 596 } 597 598 /* 599 * 802.11 output routine. This is (currently) used only to 600 * connect bpf write calls to the 802.11 layer for injecting 601 * raw 802.11 frames. 602 */ 603 #if defined(__DragonFly__) 604 int 605 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 606 struct sockaddr *dst, struct rtentry *rt) 607 #elif __FreeBSD_version >= 1000031 608 int 609 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 610 const struct sockaddr *dst, struct route *ro) 611 #else 612 int 613 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 614 struct sockaddr *dst, struct route *ro) 615 #endif 616 { 617 #define senderr(e) do { error = (e); goto bad;} while (0) 618 struct ieee80211_node *ni = NULL; 619 struct ieee80211vap *vap; 620 struct ieee80211_frame *wh; 621 struct ieee80211com *ic = NULL; 622 int error; 623 int ret; 624 625 #if defined(__DragonFly__) 626 struct ifaltq_subque *ifsq; 627 ifsq = ifq_get_subq_default(&ifp->if_snd); 628 if (ifsq_is_oactive(ifsq)) 629 #else 630 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) 631 #endif 632 { 633 /* 634 * Short-circuit requests if the vap is marked OACTIVE 635 * as this can happen because a packet came down through 636 * ieee80211_start before the vap entered RUN state in 637 * which case it's ok to just drop the frame. This 638 * should not be necessary but callers of if_output don't 639 * check OACTIVE. 640 */ 641 senderr(ENETDOWN); 642 } 643 vap = ifp->if_softc; 644 ic = vap->iv_ic; 645 /* 646 * Hand to the 802.3 code if not tagged as 647 * a raw 802.11 frame. 648 */ 649 #if defined(__DragonFly__) 650 if (dst->sa_family != AF_IEEE80211) 651 return vap->iv_output(ifp, m, dst, rt); 652 #else 653 if (dst->sa_family != AF_IEEE80211) 654 return vap->iv_output(ifp, m, dst, ro); 655 #endif 656 #ifdef MAC 657 error = mac_ifnet_check_transmit(ifp, m); 658 if (error) 659 senderr(error); 660 #endif 661 if (ifp->if_flags & IFF_MONITOR) 662 senderr(ENETDOWN); 663 if (!IFNET_IS_UP_RUNNING(ifp)) 664 senderr(ENETDOWN); 665 if (vap->iv_state == IEEE80211_S_CAC) { 666 IEEE80211_DPRINTF(vap, 667 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 668 "block %s frame in CAC state\n", "raw data"); 669 vap->iv_stats.is_tx_badstate++; 670 senderr(EIO); /* XXX */ 671 } else if (vap->iv_state == IEEE80211_S_SCAN) 672 senderr(EIO); 673 /* XXX bypass bridge, pfil, carp, etc. */ 674 675 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 676 senderr(EIO); /* XXX */ 677 wh = mtod(m, struct ieee80211_frame *); 678 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 679 IEEE80211_FC0_VERSION_0) 680 senderr(EIO); /* XXX */ 681 682 /* locate destination node */ 683 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 684 case IEEE80211_FC1_DIR_NODS: 685 case IEEE80211_FC1_DIR_FROMDS: 686 ni = ieee80211_find_txnode(vap, wh->i_addr1); 687 break; 688 case IEEE80211_FC1_DIR_TODS: 689 case IEEE80211_FC1_DIR_DSTODS: 690 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 691 senderr(EIO); /* XXX */ 692 ni = ieee80211_find_txnode(vap, wh->i_addr3); 693 break; 694 default: 695 senderr(EIO); /* XXX */ 696 } 697 if (ni == NULL) { 698 /* 699 * Permit packets w/ bpf params through regardless 700 * (see below about sa_len). 701 */ 702 if (dst->sa_len == 0) 703 senderr(EHOSTUNREACH); 704 ni = ieee80211_ref_node(vap->iv_bss); 705 } 706 707 /* 708 * Sanitize mbuf for net80211 flags leaked from above. 709 * 710 * NB: This must be done before ieee80211_classify as 711 * it marks EAPOL in frames with M_EAPOL. 712 */ 713 m->m_flags &= ~M_80211_TX; 714 715 /* calculate priority so drivers can find the tx queue */ 716 /* XXX assumes an 802.3 frame */ 717 if (ieee80211_classify(ni, m)) 718 senderr(EIO); /* XXX */ 719 720 IFNET_STAT_INC(ifp, opackets, 1); 721 IEEE80211_NODE_STAT(ni, tx_data); 722 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 723 IEEE80211_NODE_STAT(ni, tx_mcast); 724 m->m_flags |= M_MCAST; 725 } else 726 IEEE80211_NODE_STAT(ni, tx_ucast); 727 /* NB: ieee80211_encap does not include 802.11 header */ 728 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 729 730 IEEE80211_TX_LOCK(ic); 731 732 /* 733 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 734 * present by setting the sa_len field of the sockaddr (yes, 735 * this is a hack). 736 * NB: we assume sa_data is suitably aligned to cast. 737 */ 738 ret = ieee80211_raw_output(vap, ni, m, 739 (const struct ieee80211_bpf_params *)(dst->sa_len ? 740 dst->sa_data : NULL)); 741 IEEE80211_TX_UNLOCK(ic); 742 return (ret); 743 bad: 744 if (m != NULL) 745 m_freem(m); 746 if (ni != NULL) 747 ieee80211_free_node(ni); 748 IFNET_STAT_INC(ifp, oerrors, 1); 749 return error; 750 #undef senderr 751 } 752 753 /* 754 * Set the direction field and address fields of an outgoing 755 * frame. Note this should be called early on in constructing 756 * a frame as it sets i_fc[1]; other bits can then be or'd in. 757 */ 758 void 759 ieee80211_send_setup( 760 struct ieee80211_node *ni, 761 struct mbuf *m, 762 int type, int tid, 763 const uint8_t sa[IEEE80211_ADDR_LEN], 764 const uint8_t da[IEEE80211_ADDR_LEN], 765 const uint8_t bssid[IEEE80211_ADDR_LEN]) 766 { 767 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 768 struct ieee80211vap *vap = ni->ni_vap; 769 struct ieee80211_tx_ampdu *tap; 770 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 771 ieee80211_seq seqno; 772 773 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic); 774 775 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 776 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 777 switch (vap->iv_opmode) { 778 case IEEE80211_M_STA: 779 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 780 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 781 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 782 IEEE80211_ADDR_COPY(wh->i_addr3, da); 783 break; 784 case IEEE80211_M_IBSS: 785 case IEEE80211_M_AHDEMO: 786 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 787 IEEE80211_ADDR_COPY(wh->i_addr1, da); 788 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 789 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 790 break; 791 case IEEE80211_M_HOSTAP: 792 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 793 IEEE80211_ADDR_COPY(wh->i_addr1, da); 794 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 795 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 796 break; 797 case IEEE80211_M_WDS: 798 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 799 IEEE80211_ADDR_COPY(wh->i_addr1, da); 800 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 801 IEEE80211_ADDR_COPY(wh->i_addr3, da); 802 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 803 break; 804 case IEEE80211_M_MBSS: 805 #ifdef IEEE80211_SUPPORT_MESH 806 if (IEEE80211_IS_MULTICAST(da)) { 807 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 808 /* XXX next hop */ 809 IEEE80211_ADDR_COPY(wh->i_addr1, da); 810 IEEE80211_ADDR_COPY(wh->i_addr2, 811 vap->iv_myaddr); 812 } else { 813 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 814 IEEE80211_ADDR_COPY(wh->i_addr1, da); 815 IEEE80211_ADDR_COPY(wh->i_addr2, 816 vap->iv_myaddr); 817 IEEE80211_ADDR_COPY(wh->i_addr3, da); 818 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 819 } 820 #endif 821 break; 822 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 823 break; 824 } 825 } else { 826 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 827 IEEE80211_ADDR_COPY(wh->i_addr1, da); 828 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 829 #ifdef IEEE80211_SUPPORT_MESH 830 if (vap->iv_opmode == IEEE80211_M_MBSS) 831 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 832 else 833 #endif 834 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 835 } 836 *(uint16_t *)&wh->i_dur[0] = 0; 837 838 tap = &ni->ni_tx_ampdu[tid]; 839 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 840 m->m_flags |= M_AMPDU_MPDU; 841 else { 842 seqno = ni->ni_txseqs[tid]++; 843 *(uint16_t *)&wh->i_seq[0] = 844 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 845 M_SEQNO_SET(m, seqno); 846 } 847 848 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 849 m->m_flags |= M_MCAST; 850 #undef WH4 851 } 852 853 /* 854 * Send a management frame to the specified node. The node pointer 855 * must have a reference as the pointer will be passed to the driver 856 * and potentially held for a long time. If the frame is successfully 857 * dispatched to the driver, then it is responsible for freeing the 858 * reference (and potentially free'ing up any associated storage); 859 * otherwise deal with reclaiming any reference (on error). 860 */ 861 int 862 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 863 struct ieee80211_bpf_params *params) 864 { 865 struct ieee80211vap *vap = ni->ni_vap; 866 struct ieee80211com *ic = ni->ni_ic; 867 struct ieee80211_frame *wh; 868 int ret; 869 870 KASSERT(ni != NULL, ("null node")); 871 872 if (vap->iv_state == IEEE80211_S_CAC) { 873 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 874 ni, "block %s frame in CAC state", 875 ieee80211_mgt_subtype_name[ 876 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 877 IEEE80211_FC0_SUBTYPE_SHIFT]); 878 vap->iv_stats.is_tx_badstate++; 879 ieee80211_free_node(ni); 880 m_freem(m); 881 return EIO; /* XXX */ 882 } 883 884 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 885 if (m == NULL) { 886 ieee80211_free_node(ni); 887 return ENOMEM; 888 } 889 890 IEEE80211_TX_LOCK(ic); 891 892 wh = mtod(m, struct ieee80211_frame *); 893 ieee80211_send_setup(ni, m, 894 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 895 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 896 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 897 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 898 "encrypting frame (%s)", __func__); 899 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 900 } 901 m->m_flags |= M_ENCAP; /* mark encapsulated */ 902 903 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 904 M_WME_SETAC(m, params->ibp_pri); 905 906 #ifdef IEEE80211_DEBUG 907 /* avoid printing too many frames */ 908 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 909 ieee80211_msg_dumppkts(vap)) { 910 kprintf("[%s] send %s on channel %u\n", 911 ether_sprintf(wh->i_addr1), 912 ieee80211_mgt_subtype_name[ 913 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 914 IEEE80211_FC0_SUBTYPE_SHIFT], 915 ieee80211_chan2ieee(ic, ic->ic_curchan)); 916 } 917 #endif 918 IEEE80211_NODE_STAT(ni, tx_mgmt); 919 920 ret = ieee80211_raw_output(vap, ni, m, params); 921 IEEE80211_TX_UNLOCK(ic); 922 return (ret); 923 } 924 925 /* 926 * Send a null data frame to the specified node. If the station 927 * is setup for QoS then a QoS Null Data frame is constructed. 928 * If this is a WDS station then a 4-address frame is constructed. 929 * 930 * NB: the caller is assumed to have setup a node reference 931 * for use; this is necessary to deal with a race condition 932 * when probing for inactive stations. Like ieee80211_mgmt_output 933 * we must cleanup any node reference on error; however we 934 * can safely just unref it as we know it will never be the 935 * last reference to the node. 936 */ 937 int 938 ieee80211_send_nulldata(struct ieee80211_node *ni) 939 { 940 struct ieee80211vap *vap = ni->ni_vap; 941 struct ieee80211com *ic = ni->ni_ic; 942 struct mbuf *m; 943 struct ieee80211_frame *wh; 944 int hdrlen; 945 uint8_t *frm; 946 int ret; 947 948 if (vap->iv_state == IEEE80211_S_CAC) { 949 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 950 ni, "block %s frame in CAC state", "null data"); 951 ieee80211_unref_node(&ni); 952 vap->iv_stats.is_tx_badstate++; 953 return EIO; /* XXX */ 954 } 955 956 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 957 hdrlen = sizeof(struct ieee80211_qosframe); 958 else 959 hdrlen = sizeof(struct ieee80211_frame); 960 /* NB: only WDS vap's get 4-address frames */ 961 if (vap->iv_opmode == IEEE80211_M_WDS) 962 hdrlen += IEEE80211_ADDR_LEN; 963 if (ic->ic_flags & IEEE80211_F_DATAPAD) 964 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 965 966 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 967 if (m == NULL) { 968 /* XXX debug msg */ 969 ieee80211_unref_node(&ni); 970 vap->iv_stats.is_tx_nobuf++; 971 return ENOMEM; 972 } 973 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 974 ("leading space %zd", M_LEADINGSPACE(m))); 975 M_PREPEND(m, hdrlen, M_NOWAIT); 976 if (m == NULL) { 977 /* NB: cannot happen */ 978 ieee80211_free_node(ni); 979 return ENOMEM; 980 } 981 982 IEEE80211_TX_LOCK(ic); 983 984 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 985 if (ni->ni_flags & IEEE80211_NODE_QOS) { 986 const int tid = WME_AC_TO_TID(WME_AC_BE); 987 uint8_t *qos; 988 989 ieee80211_send_setup(ni, m, 990 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 991 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 992 993 if (vap->iv_opmode == IEEE80211_M_WDS) 994 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 995 else 996 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 997 qos[0] = tid & IEEE80211_QOS_TID; 998 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 999 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1000 qos[1] = 0; 1001 } else { 1002 ieee80211_send_setup(ni, m, 1003 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 1004 IEEE80211_NONQOS_TID, 1005 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 1006 } 1007 if (vap->iv_opmode != IEEE80211_M_WDS) { 1008 /* NB: power management bit is never sent by an AP */ 1009 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 1010 vap->iv_opmode != IEEE80211_M_HOSTAP) 1011 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 1012 } 1013 m->m_len = m->m_pkthdr.len = hdrlen; 1014 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1015 1016 M_WME_SETAC(m, WME_AC_BE); 1017 1018 IEEE80211_NODE_STAT(ni, tx_data); 1019 1020 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 1021 "send %snull data frame on channel %u, pwr mgt %s", 1022 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 1023 ieee80211_chan2ieee(ic, ic->ic_curchan), 1024 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 1025 1026 ret = ieee80211_raw_output(vap, ni, m, NULL); 1027 IEEE80211_TX_UNLOCK(ic); 1028 return (ret); 1029 } 1030 1031 /* 1032 * Assign priority to a frame based on any vlan tag assigned 1033 * to the station and/or any Diffserv setting in an IP header. 1034 * Finally, if an ACM policy is setup (in station mode) it's 1035 * applied. 1036 */ 1037 int 1038 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 1039 { 1040 const struct ether_header *eh = mtod(m, struct ether_header *); 1041 int v_wme_ac, d_wme_ac, ac; 1042 1043 /* 1044 * Always promote PAE/EAPOL frames to high priority. 1045 */ 1046 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 1047 /* NB: mark so others don't need to check header */ 1048 m->m_flags |= M_EAPOL; 1049 ac = WME_AC_VO; 1050 goto done; 1051 } 1052 /* 1053 * Non-qos traffic goes to BE. 1054 */ 1055 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 1056 ac = WME_AC_BE; 1057 goto done; 1058 } 1059 1060 /* 1061 * If node has a vlan tag then all traffic 1062 * to it must have a matching tag. 1063 */ 1064 v_wme_ac = 0; 1065 if (ni->ni_vlan != 0) { 1066 if ((m->m_flags & M_VLANTAG) == 0) { 1067 IEEE80211_NODE_STAT(ni, tx_novlantag); 1068 return 1; 1069 } 1070 #if defined(__DragonFly__) 1071 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 1072 EVL_VLANOFTAG(ni->ni_vlan)) { 1073 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1074 return 1; 1075 } 1076 #else 1077 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 1078 EVL_VLANOFTAG(ni->ni_vlan)) { 1079 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1080 return 1; 1081 } 1082 #endif 1083 /* map vlan priority to AC */ 1084 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 1085 } 1086 1087 /* XXX m_copydata may be too slow for fast path */ 1088 #ifdef INET 1089 if (eh->ether_type == htons(ETHERTYPE_IP)) { 1090 uint8_t tos; 1091 /* 1092 * IP frame, map the DSCP bits from the TOS field. 1093 */ 1094 /* NB: ip header may not be in first mbuf */ 1095 m_copydata(m, sizeof(struct ether_header) + 1096 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 1097 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1098 d_wme_ac = TID_TO_WME_AC(tos); 1099 } else { 1100 #endif /* INET */ 1101 #ifdef INET6 1102 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 1103 uint32_t flow; 1104 uint8_t tos; 1105 /* 1106 * IPv6 frame, map the DSCP bits from the traffic class field. 1107 */ 1108 m_copydata(m, sizeof(struct ether_header) + 1109 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 1110 (caddr_t) &flow); 1111 tos = (uint8_t)(ntohl(flow) >> 20); 1112 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1113 d_wme_ac = TID_TO_WME_AC(tos); 1114 } else { 1115 #endif /* INET6 */ 1116 d_wme_ac = WME_AC_BE; 1117 #ifdef INET6 1118 } 1119 #endif 1120 #ifdef INET 1121 } 1122 #endif 1123 /* 1124 * Use highest priority AC. 1125 */ 1126 if (v_wme_ac > d_wme_ac) 1127 ac = v_wme_ac; 1128 else 1129 ac = d_wme_ac; 1130 1131 /* 1132 * Apply ACM policy. 1133 */ 1134 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 1135 static const int acmap[4] = { 1136 WME_AC_BK, /* WME_AC_BE */ 1137 WME_AC_BK, /* WME_AC_BK */ 1138 WME_AC_BE, /* WME_AC_VI */ 1139 WME_AC_VI, /* WME_AC_VO */ 1140 }; 1141 struct ieee80211com *ic = ni->ni_ic; 1142 1143 while (ac != WME_AC_BK && 1144 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 1145 ac = acmap[ac]; 1146 } 1147 done: 1148 M_WME_SETAC(m, ac); 1149 return 0; 1150 } 1151 1152 /* 1153 * Insure there is sufficient contiguous space to encapsulate the 1154 * 802.11 data frame. If room isn't already there, arrange for it. 1155 * Drivers and cipher modules assume we have done the necessary work 1156 * and fail rudely if they don't find the space they need. 1157 */ 1158 struct mbuf * 1159 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 1160 struct ieee80211_key *key, struct mbuf *m) 1161 { 1162 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 1163 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 1164 1165 if (key != NULL) { 1166 /* XXX belongs in crypto code? */ 1167 needed_space += key->wk_cipher->ic_header; 1168 /* XXX frags */ 1169 /* 1170 * When crypto is being done in the host we must insure 1171 * the data are writable for the cipher routines; clone 1172 * a writable mbuf chain. 1173 * XXX handle SWMIC specially 1174 */ 1175 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 1176 m = m_unshare(m, M_NOWAIT); 1177 if (m == NULL) { 1178 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1179 "%s: cannot get writable mbuf\n", __func__); 1180 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1181 return NULL; 1182 } 1183 } 1184 } 1185 /* 1186 * We know we are called just before stripping an Ethernet 1187 * header and prepending an LLC header. This means we know 1188 * there will be 1189 * sizeof(struct ether_header) - sizeof(struct llc) 1190 * bytes recovered to which we need additional space for the 1191 * 802.11 header and any crypto header. 1192 */ 1193 /* XXX check trailing space and copy instead? */ 1194 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1195 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1196 if (n == NULL) { 1197 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1198 "%s: cannot expand storage\n", __func__); 1199 vap->iv_stats.is_tx_nobuf++; 1200 m_freem(m); 1201 return NULL; 1202 } 1203 #if defined(__DragonFly__) 1204 KASSERT(needed_space <= MHLEN, 1205 ("not enough room, need %u got %zd\n", needed_space, MHLEN)); 1206 #else 1207 KASSERT(needed_space <= MHLEN, 1208 ("not enough room, need %u got %d\n", needed_space, MHLEN)); 1209 #endif 1210 /* 1211 * Setup new mbuf to have leading space to prepend the 1212 * 802.11 header and any crypto header bits that are 1213 * required (the latter are added when the driver calls 1214 * back to ieee80211_crypto_encap to do crypto encapsulation). 1215 */ 1216 /* NB: must be first 'cuz it clobbers m_data */ 1217 m_move_pkthdr(n, m); 1218 n->m_len = 0; /* NB: m_gethdr does not set */ 1219 n->m_data += needed_space; 1220 /* 1221 * Pull up Ethernet header to create the expected layout. 1222 * We could use m_pullup but that's overkill (i.e. we don't 1223 * need the actual data) and it cannot fail so do it inline 1224 * for speed. 1225 */ 1226 /* NB: struct ether_header is known to be contiguous */ 1227 n->m_len += sizeof(struct ether_header); 1228 m->m_len -= sizeof(struct ether_header); 1229 m->m_data += sizeof(struct ether_header); 1230 /* 1231 * Replace the head of the chain. 1232 */ 1233 n->m_next = m; 1234 m = n; 1235 } 1236 return m; 1237 #undef TO_BE_RECLAIMED 1238 } 1239 1240 /* 1241 * Return the transmit key to use in sending a unicast frame. 1242 * If a unicast key is set we use that. When no unicast key is set 1243 * we fall back to the default transmit key. 1244 */ 1245 static __inline struct ieee80211_key * 1246 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1247 struct ieee80211_node *ni) 1248 { 1249 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1250 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1251 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1252 return NULL; 1253 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1254 } else { 1255 return &ni->ni_ucastkey; 1256 } 1257 } 1258 1259 /* 1260 * Return the transmit key to use in sending a multicast frame. 1261 * Multicast traffic always uses the group key which is installed as 1262 * the default tx key. 1263 */ 1264 static __inline struct ieee80211_key * 1265 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1266 struct ieee80211_node *ni) 1267 { 1268 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1269 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1270 return NULL; 1271 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1272 } 1273 1274 /* 1275 * Encapsulate an outbound data frame. The mbuf chain is updated. 1276 * If an error is encountered NULL is returned. The caller is required 1277 * to provide a node reference and pullup the ethernet header in the 1278 * first mbuf. 1279 * 1280 * NB: Packet is assumed to be processed by ieee80211_classify which 1281 * marked EAPOL frames w/ M_EAPOL. 1282 */ 1283 struct mbuf * 1284 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1285 struct mbuf *m) 1286 { 1287 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1288 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1289 struct ieee80211com *ic = ni->ni_ic; 1290 #ifdef IEEE80211_SUPPORT_MESH 1291 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1292 struct ieee80211_meshcntl_ae10 *mc; 1293 struct ieee80211_mesh_route *rt = NULL; 1294 int dir = -1; 1295 #endif 1296 struct ether_header eh; 1297 struct ieee80211_frame *wh; 1298 struct ieee80211_key *key; 1299 struct llc *llc; 1300 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1301 ieee80211_seq seqno; 1302 int meshhdrsize, meshae; 1303 uint8_t *qos; 1304 1305 IEEE80211_TX_LOCK_ASSERT(ic); 1306 1307 /* 1308 * Copy existing Ethernet header to a safe place. The 1309 * rest of the code assumes it's ok to strip it when 1310 * reorganizing state for the final encapsulation. 1311 */ 1312 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1313 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1314 1315 /* 1316 * Insure space for additional headers. First identify 1317 * transmit key to use in calculating any buffer adjustments 1318 * required. This is also used below to do privacy 1319 * encapsulation work. Then calculate the 802.11 header 1320 * size and any padding required by the driver. 1321 * 1322 * Note key may be NULL if we fall back to the default 1323 * transmit key and that is not set. In that case the 1324 * buffer may not be expanded as needed by the cipher 1325 * routines, but they will/should discard it. 1326 */ 1327 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1328 if (vap->iv_opmode == IEEE80211_M_STA || 1329 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1330 (vap->iv_opmode == IEEE80211_M_WDS && 1331 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1332 key = ieee80211_crypto_getucastkey(vap, ni); 1333 else 1334 key = ieee80211_crypto_getmcastkey(vap, ni); 1335 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1336 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1337 eh.ether_dhost, 1338 "no default transmit key (%s) deftxkey %u", 1339 __func__, vap->iv_def_txkey); 1340 vap->iv_stats.is_tx_nodefkey++; 1341 goto bad; 1342 } 1343 } else 1344 key = NULL; 1345 /* 1346 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1347 * frames so suppress use. This may be an issue if other 1348 * ap's require all data frames to be QoS-encapsulated 1349 * once negotiated in which case we'll need to make this 1350 * configurable. 1351 * NB: mesh data frames are QoS. 1352 */ 1353 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1354 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1355 (m->m_flags & M_EAPOL) == 0; 1356 if (addqos) 1357 hdrsize = sizeof(struct ieee80211_qosframe); 1358 else 1359 hdrsize = sizeof(struct ieee80211_frame); 1360 #ifdef IEEE80211_SUPPORT_MESH 1361 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1362 /* 1363 * Mesh data frames are encapsulated according to the 1364 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1365 * o Group Addressed data (aka multicast) originating 1366 * at the local sta are sent w/ 3-address format and 1367 * address extension mode 00 1368 * o Individually Addressed data (aka unicast) originating 1369 * at the local sta are sent w/ 4-address format and 1370 * address extension mode 00 1371 * o Group Addressed data forwarded from a non-mesh sta are 1372 * sent w/ 3-address format and address extension mode 01 1373 * o Individually Address data from another sta are sent 1374 * w/ 4-address format and address extension mode 10 1375 */ 1376 is4addr = 0; /* NB: don't use, disable */ 1377 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1378 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1379 KASSERT(rt != NULL, ("route is NULL")); 1380 dir = IEEE80211_FC1_DIR_DSTODS; 1381 hdrsize += IEEE80211_ADDR_LEN; 1382 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1383 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1384 vap->iv_myaddr)) { 1385 IEEE80211_NOTE_MAC(vap, 1386 IEEE80211_MSG_MESH, 1387 eh.ether_dhost, 1388 "%s", "trying to send to ourself"); 1389 goto bad; 1390 } 1391 meshae = IEEE80211_MESH_AE_10; 1392 meshhdrsize = 1393 sizeof(struct ieee80211_meshcntl_ae10); 1394 } else { 1395 meshae = IEEE80211_MESH_AE_00; 1396 meshhdrsize = 1397 sizeof(struct ieee80211_meshcntl); 1398 } 1399 } else { 1400 dir = IEEE80211_FC1_DIR_FROMDS; 1401 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1402 /* proxy group */ 1403 meshae = IEEE80211_MESH_AE_01; 1404 meshhdrsize = 1405 sizeof(struct ieee80211_meshcntl_ae01); 1406 } else { 1407 /* group */ 1408 meshae = IEEE80211_MESH_AE_00; 1409 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1410 } 1411 } 1412 } else { 1413 #endif 1414 /* 1415 * 4-address frames need to be generated for: 1416 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1417 * o packets sent through a vap marked for relaying 1418 * (e.g. a station operating with dynamic WDS) 1419 */ 1420 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1421 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1422 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1423 if (is4addr) 1424 hdrsize += IEEE80211_ADDR_LEN; 1425 meshhdrsize = meshae = 0; 1426 #ifdef IEEE80211_SUPPORT_MESH 1427 } 1428 #endif 1429 /* 1430 * Honor driver DATAPAD requirement. 1431 */ 1432 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1433 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1434 else 1435 hdrspace = hdrsize; 1436 1437 if (__predict_true((m->m_flags & M_FF) == 0)) { 1438 /* 1439 * Normal frame. 1440 */ 1441 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1442 if (m == NULL) { 1443 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1444 goto bad; 1445 } 1446 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1447 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1448 llc = mtod(m, struct llc *); 1449 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1450 llc->llc_control = LLC_UI; 1451 llc->llc_snap.org_code[0] = 0; 1452 llc->llc_snap.org_code[1] = 0; 1453 llc->llc_snap.org_code[2] = 0; 1454 llc->llc_snap.ether_type = eh.ether_type; 1455 } else { 1456 #ifdef IEEE80211_SUPPORT_SUPERG 1457 /* 1458 * Aggregated frame. 1459 */ 1460 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1461 if (m == NULL) 1462 #endif 1463 goto bad; 1464 } 1465 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1466 1467 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1468 if (m == NULL) { 1469 vap->iv_stats.is_tx_nobuf++; 1470 goto bad; 1471 } 1472 wh = mtod(m, struct ieee80211_frame *); 1473 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1474 *(uint16_t *)wh->i_dur = 0; 1475 qos = NULL; /* NB: quiet compiler */ 1476 if (is4addr) { 1477 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1478 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1479 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1480 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1481 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1482 } else switch (vap->iv_opmode) { 1483 case IEEE80211_M_STA: 1484 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1485 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1486 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1487 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1488 break; 1489 case IEEE80211_M_IBSS: 1490 case IEEE80211_M_AHDEMO: 1491 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1492 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1493 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1494 /* 1495 * NB: always use the bssid from iv_bss as the 1496 * neighbor's may be stale after an ibss merge 1497 */ 1498 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1499 break; 1500 case IEEE80211_M_HOSTAP: 1501 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1502 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1503 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1504 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1505 break; 1506 #ifdef IEEE80211_SUPPORT_MESH 1507 case IEEE80211_M_MBSS: 1508 /* NB: offset by hdrspace to deal with DATAPAD */ 1509 mc = (struct ieee80211_meshcntl_ae10 *) 1510 (mtod(m, uint8_t *) + hdrspace); 1511 wh->i_fc[1] = dir; 1512 switch (meshae) { 1513 case IEEE80211_MESH_AE_00: /* no proxy */ 1514 mc->mc_flags = 0; 1515 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1516 IEEE80211_ADDR_COPY(wh->i_addr1, 1517 ni->ni_macaddr); 1518 IEEE80211_ADDR_COPY(wh->i_addr2, 1519 vap->iv_myaddr); 1520 IEEE80211_ADDR_COPY(wh->i_addr3, 1521 eh.ether_dhost); 1522 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1523 eh.ether_shost); 1524 qos =((struct ieee80211_qosframe_addr4 *) 1525 wh)->i_qos; 1526 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1527 /* mcast */ 1528 IEEE80211_ADDR_COPY(wh->i_addr1, 1529 eh.ether_dhost); 1530 IEEE80211_ADDR_COPY(wh->i_addr2, 1531 vap->iv_myaddr); 1532 IEEE80211_ADDR_COPY(wh->i_addr3, 1533 eh.ether_shost); 1534 qos = ((struct ieee80211_qosframe *) 1535 wh)->i_qos; 1536 } 1537 break; 1538 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1539 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1540 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1541 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1542 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1543 mc->mc_flags = 1; 1544 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1545 eh.ether_shost); 1546 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1547 break; 1548 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1549 KASSERT(rt != NULL, ("route is NULL")); 1550 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1551 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1552 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1553 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1554 mc->mc_flags = IEEE80211_MESH_AE_10; 1555 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1556 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1557 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1558 break; 1559 default: 1560 KASSERT(0, ("meshae %d", meshae)); 1561 break; 1562 } 1563 mc->mc_ttl = ms->ms_ttl; 1564 ms->ms_seq++; 1565 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1566 break; 1567 #endif 1568 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1569 default: 1570 goto bad; 1571 } 1572 if (m->m_flags & M_MORE_DATA) 1573 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1574 if (addqos) { 1575 int ac, tid; 1576 1577 if (is4addr) { 1578 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1579 /* NB: mesh case handled earlier */ 1580 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1581 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1582 ac = M_WME_GETAC(m); 1583 /* map from access class/queue to 11e header priorty value */ 1584 tid = WME_AC_TO_TID(ac); 1585 qos[0] = tid & IEEE80211_QOS_TID; 1586 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1587 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1588 #ifdef IEEE80211_SUPPORT_MESH 1589 if (vap->iv_opmode == IEEE80211_M_MBSS) 1590 qos[1] = IEEE80211_QOS_MC; 1591 else 1592 #endif 1593 qos[1] = 0; 1594 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1595 1596 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1597 /* 1598 * NB: don't assign a sequence # to potential 1599 * aggregates; we expect this happens at the 1600 * point the frame comes off any aggregation q 1601 * as otherwise we may introduce holes in the 1602 * BA sequence space and/or make window accouting 1603 * more difficult. 1604 * 1605 * XXX may want to control this with a driver 1606 * capability; this may also change when we pull 1607 * aggregation up into net80211 1608 */ 1609 seqno = ni->ni_txseqs[tid]++; 1610 *(uint16_t *)wh->i_seq = 1611 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1612 M_SEQNO_SET(m, seqno); 1613 } 1614 } else { 1615 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1616 *(uint16_t *)wh->i_seq = 1617 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1618 M_SEQNO_SET(m, seqno); 1619 } 1620 1621 1622 /* check if xmit fragmentation is required */ 1623 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1624 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1625 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1626 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1627 if (key != NULL) { 1628 /* 1629 * IEEE 802.1X: send EAPOL frames always in the clear. 1630 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1631 */ 1632 if ((m->m_flags & M_EAPOL) == 0 || 1633 ((vap->iv_flags & IEEE80211_F_WPA) && 1634 (vap->iv_opmode == IEEE80211_M_STA ? 1635 !IEEE80211_KEY_UNDEFINED(key) : 1636 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1637 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 1638 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1639 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1640 eh.ether_dhost, 1641 "%s", "enmic failed, discard frame"); 1642 vap->iv_stats.is_crypto_enmicfail++; 1643 goto bad; 1644 } 1645 } 1646 } 1647 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1648 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1649 goto bad; 1650 1651 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1652 1653 IEEE80211_NODE_STAT(ni, tx_data); 1654 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1655 IEEE80211_NODE_STAT(ni, tx_mcast); 1656 m->m_flags |= M_MCAST; 1657 } else 1658 IEEE80211_NODE_STAT(ni, tx_ucast); 1659 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1660 1661 return m; 1662 bad: 1663 if (m != NULL) 1664 m_freem(m); 1665 return NULL; 1666 #undef WH4 1667 #undef MC01 1668 } 1669 1670 /* 1671 * Fragment the frame according to the specified mtu. 1672 * The size of the 802.11 header (w/o padding) is provided 1673 * so we don't need to recalculate it. We create a new 1674 * mbuf for each fragment and chain it through m_nextpkt; 1675 * we might be able to optimize this by reusing the original 1676 * packet's mbufs but that is significantly more complicated. 1677 */ 1678 static int 1679 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1680 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1681 { 1682 struct ieee80211com *ic = vap->iv_ic; 1683 struct ieee80211_frame *wh, *whf; 1684 struct mbuf *m, *prev, *next; 1685 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1686 u_int hdrspace; 1687 1688 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1689 KASSERT(m0->m_pkthdr.len > mtu, 1690 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1691 1692 /* 1693 * Honor driver DATAPAD requirement. 1694 */ 1695 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1696 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1697 else 1698 hdrspace = hdrsize; 1699 1700 wh = mtod(m0, struct ieee80211_frame *); 1701 /* NB: mark the first frag; it will be propagated below */ 1702 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1703 totalhdrsize = hdrspace + ciphdrsize; 1704 fragno = 1; 1705 off = mtu - ciphdrsize; 1706 remainder = m0->m_pkthdr.len - off; 1707 prev = m0; 1708 do { 1709 fragsize = totalhdrsize + remainder; 1710 if (fragsize > mtu) 1711 fragsize = mtu; 1712 /* XXX fragsize can be >2048! */ 1713 KASSERT(fragsize < MCLBYTES, 1714 ("fragment size %u too big!", fragsize)); 1715 if (fragsize > MHLEN) 1716 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1717 else 1718 m = m_gethdr(M_NOWAIT, MT_DATA); 1719 if (m == NULL) 1720 goto bad; 1721 /* leave room to prepend any cipher header */ 1722 m_align(m, fragsize - ciphdrsize); 1723 1724 /* 1725 * Form the header in the fragment. Note that since 1726 * we mark the first fragment with the MORE_FRAG bit 1727 * it automatically is propagated to each fragment; we 1728 * need only clear it on the last fragment (done below). 1729 * NB: frag 1+ dont have Mesh Control field present. 1730 */ 1731 whf = mtod(m, struct ieee80211_frame *); 1732 memcpy(whf, wh, hdrsize); 1733 #ifdef IEEE80211_SUPPORT_MESH 1734 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1735 if (IEEE80211_IS_DSTODS(wh)) 1736 ((struct ieee80211_qosframe_addr4 *) 1737 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1738 else 1739 ((struct ieee80211_qosframe *) 1740 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1741 } 1742 #endif 1743 *(uint16_t *)&whf->i_seq[0] |= htole16( 1744 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1745 IEEE80211_SEQ_FRAG_SHIFT); 1746 fragno++; 1747 1748 payload = fragsize - totalhdrsize; 1749 /* NB: destination is known to be contiguous */ 1750 1751 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace); 1752 m->m_len = hdrspace + payload; 1753 m->m_pkthdr.len = hdrspace + payload; 1754 m->m_flags |= M_FRAG; 1755 1756 /* chain up the fragment */ 1757 prev->m_nextpkt = m; 1758 prev = m; 1759 1760 /* deduct fragment just formed */ 1761 remainder -= payload; 1762 off += payload; 1763 } while (remainder != 0); 1764 1765 /* set the last fragment */ 1766 m->m_flags |= M_LASTFRAG; 1767 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1768 1769 /* strip first mbuf now that everything has been copied */ 1770 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1771 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1772 1773 vap->iv_stats.is_tx_fragframes++; 1774 vap->iv_stats.is_tx_frags += fragno-1; 1775 1776 return 1; 1777 bad: 1778 /* reclaim fragments but leave original frame for caller to free */ 1779 for (m = m0->m_nextpkt; m != NULL; m = next) { 1780 next = m->m_nextpkt; 1781 m->m_nextpkt = NULL; /* XXX paranoid */ 1782 m_freem(m); 1783 } 1784 m0->m_nextpkt = NULL; 1785 return 0; 1786 } 1787 1788 /* 1789 * Add a supported rates element id to a frame. 1790 */ 1791 uint8_t * 1792 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1793 { 1794 int nrates; 1795 1796 *frm++ = IEEE80211_ELEMID_RATES; 1797 nrates = rs->rs_nrates; 1798 if (nrates > IEEE80211_RATE_SIZE) 1799 nrates = IEEE80211_RATE_SIZE; 1800 *frm++ = nrates; 1801 memcpy(frm, rs->rs_rates, nrates); 1802 return frm + nrates; 1803 } 1804 1805 /* 1806 * Add an extended supported rates element id to a frame. 1807 */ 1808 uint8_t * 1809 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1810 { 1811 /* 1812 * Add an extended supported rates element if operating in 11g mode. 1813 */ 1814 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1815 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1816 *frm++ = IEEE80211_ELEMID_XRATES; 1817 *frm++ = nrates; 1818 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1819 frm += nrates; 1820 } 1821 return frm; 1822 } 1823 1824 /* 1825 * Add an ssid element to a frame. 1826 */ 1827 uint8_t * 1828 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1829 { 1830 *frm++ = IEEE80211_ELEMID_SSID; 1831 *frm++ = len; 1832 memcpy(frm, ssid, len); 1833 return frm + len; 1834 } 1835 1836 /* 1837 * Add an erp element to a frame. 1838 */ 1839 static uint8_t * 1840 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1841 { 1842 uint8_t erp; 1843 1844 *frm++ = IEEE80211_ELEMID_ERP; 1845 *frm++ = 1; 1846 erp = 0; 1847 if (ic->ic_nonerpsta != 0) 1848 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1849 if (ic->ic_flags & IEEE80211_F_USEPROT) 1850 erp |= IEEE80211_ERP_USE_PROTECTION; 1851 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1852 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1853 *frm++ = erp; 1854 return frm; 1855 } 1856 1857 /* 1858 * Add a CFParams element to a frame. 1859 */ 1860 static uint8_t * 1861 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1862 { 1863 #define ADDSHORT(frm, v) do { \ 1864 LE_WRITE_2(frm, v); \ 1865 frm += 2; \ 1866 } while (0) 1867 *frm++ = IEEE80211_ELEMID_CFPARMS; 1868 *frm++ = 6; 1869 *frm++ = 0; /* CFP count */ 1870 *frm++ = 2; /* CFP period */ 1871 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1872 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1873 return frm; 1874 #undef ADDSHORT 1875 } 1876 1877 static __inline uint8_t * 1878 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1879 { 1880 memcpy(frm, ie->ie_data, ie->ie_len); 1881 return frm + ie->ie_len; 1882 } 1883 1884 static __inline uint8_t * 1885 add_ie(uint8_t *frm, const uint8_t *ie) 1886 { 1887 memcpy(frm, ie, 2 + ie[1]); 1888 return frm + 2 + ie[1]; 1889 } 1890 1891 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1892 /* 1893 * Add a WME information element to a frame. 1894 */ 1895 static uint8_t * 1896 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1897 { 1898 static const struct ieee80211_wme_info info = { 1899 .wme_id = IEEE80211_ELEMID_VENDOR, 1900 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1901 .wme_oui = { WME_OUI_BYTES }, 1902 .wme_type = WME_OUI_TYPE, 1903 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1904 .wme_version = WME_VERSION, 1905 .wme_info = 0, 1906 }; 1907 memcpy(frm, &info, sizeof(info)); 1908 return frm + sizeof(info); 1909 } 1910 1911 /* 1912 * Add a WME parameters element to a frame. 1913 */ 1914 static uint8_t * 1915 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1916 { 1917 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1918 #define ADDSHORT(frm, v) do { \ 1919 LE_WRITE_2(frm, v); \ 1920 frm += 2; \ 1921 } while (0) 1922 /* NB: this works 'cuz a param has an info at the front */ 1923 static const struct ieee80211_wme_info param = { 1924 .wme_id = IEEE80211_ELEMID_VENDOR, 1925 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1926 .wme_oui = { WME_OUI_BYTES }, 1927 .wme_type = WME_OUI_TYPE, 1928 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1929 .wme_version = WME_VERSION, 1930 }; 1931 int i; 1932 1933 memcpy(frm, ¶m, sizeof(param)); 1934 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1935 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1936 *frm++ = 0; /* reserved field */ 1937 for (i = 0; i < WME_NUM_AC; i++) { 1938 const struct wmeParams *ac = 1939 &wme->wme_bssChanParams.cap_wmeParams[i]; 1940 *frm++ = SM(i, WME_PARAM_ACI) 1941 | SM(ac->wmep_acm, WME_PARAM_ACM) 1942 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1943 ; 1944 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1945 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1946 ; 1947 ADDSHORT(frm, ac->wmep_txopLimit); 1948 } 1949 return frm; 1950 #undef SM 1951 #undef ADDSHORT 1952 } 1953 #undef WME_OUI_BYTES 1954 1955 /* 1956 * Add an 11h Power Constraint element to a frame. 1957 */ 1958 static uint8_t * 1959 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1960 { 1961 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1962 /* XXX per-vap tx power limit? */ 1963 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1964 1965 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1966 frm[1] = 1; 1967 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1968 return frm + 3; 1969 } 1970 1971 /* 1972 * Add an 11h Power Capability element to a frame. 1973 */ 1974 static uint8_t * 1975 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1976 { 1977 frm[0] = IEEE80211_ELEMID_PWRCAP; 1978 frm[1] = 2; 1979 frm[2] = c->ic_minpower; 1980 frm[3] = c->ic_maxpower; 1981 return frm + 4; 1982 } 1983 1984 /* 1985 * Add an 11h Supported Channels element to a frame. 1986 */ 1987 static uint8_t * 1988 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1989 { 1990 static const int ielen = 26; 1991 1992 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1993 frm[1] = ielen; 1994 /* XXX not correct */ 1995 memcpy(frm+2, ic->ic_chan_avail, ielen); 1996 return frm + 2 + ielen; 1997 } 1998 1999 /* 2000 * Add an 11h Quiet time element to a frame. 2001 */ 2002 static uint8_t * 2003 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 2004 { 2005 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 2006 2007 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 2008 quiet->len = 6; 2009 if (vap->iv_quiet_count_value == 1) 2010 vap->iv_quiet_count_value = vap->iv_quiet_count; 2011 else if (vap->iv_quiet_count_value > 1) 2012 vap->iv_quiet_count_value--; 2013 2014 if (vap->iv_quiet_count_value == 0) { 2015 /* value 0 is reserved as per 802.11h standerd */ 2016 vap->iv_quiet_count_value = 1; 2017 } 2018 2019 quiet->tbttcount = vap->iv_quiet_count_value; 2020 quiet->period = vap->iv_quiet_period; 2021 quiet->duration = htole16(vap->iv_quiet_duration); 2022 quiet->offset = htole16(vap->iv_quiet_offset); 2023 return frm + sizeof(*quiet); 2024 } 2025 2026 /* 2027 * Add an 11h Channel Switch Announcement element to a frame. 2028 * Note that we use the per-vap CSA count to adjust the global 2029 * counter so we can use this routine to form probe response 2030 * frames and get the current count. 2031 */ 2032 static uint8_t * 2033 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 2034 { 2035 struct ieee80211com *ic = vap->iv_ic; 2036 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 2037 2038 csa->csa_ie = IEEE80211_ELEMID_CSA; 2039 csa->csa_len = 3; 2040 csa->csa_mode = 1; /* XXX force quiet on channel */ 2041 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 2042 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 2043 return frm + sizeof(*csa); 2044 } 2045 2046 /* 2047 * Add an 11h country information element to a frame. 2048 */ 2049 static uint8_t * 2050 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 2051 { 2052 2053 if (ic->ic_countryie == NULL || 2054 ic->ic_countryie_chan != ic->ic_bsschan) { 2055 /* 2056 * Handle lazy construction of ie. This is done on 2057 * first use and after a channel change that requires 2058 * re-calculation. 2059 */ 2060 if (ic->ic_countryie != NULL) 2061 kfree(ic->ic_countryie, M_80211_NODE_IE); 2062 ic->ic_countryie = ieee80211_alloc_countryie(ic); 2063 if (ic->ic_countryie == NULL) 2064 return frm; 2065 ic->ic_countryie_chan = ic->ic_bsschan; 2066 } 2067 return add_appie(frm, ic->ic_countryie); 2068 } 2069 2070 uint8_t * 2071 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap) 2072 { 2073 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) 2074 return (add_ie(frm, vap->iv_wpa_ie)); 2075 else { 2076 /* XXX else complain? */ 2077 return (frm); 2078 } 2079 } 2080 2081 uint8_t * 2082 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap) 2083 { 2084 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL) 2085 return (add_ie(frm, vap->iv_rsn_ie)); 2086 else { 2087 /* XXX else complain? */ 2088 return (frm); 2089 } 2090 } 2091 2092 uint8_t * 2093 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni) 2094 { 2095 if (ni->ni_flags & IEEE80211_NODE_QOS) { 2096 *frm++ = IEEE80211_ELEMID_QOS; 2097 *frm++ = 1; 2098 *frm++ = 0; 2099 } 2100 2101 return (frm); 2102 } 2103 2104 /* 2105 * Send a probe request frame with the specified ssid 2106 * and any optional information element data. 2107 */ 2108 int 2109 ieee80211_send_probereq(struct ieee80211_node *ni, 2110 const uint8_t sa[IEEE80211_ADDR_LEN], 2111 const uint8_t da[IEEE80211_ADDR_LEN], 2112 const uint8_t bssid[IEEE80211_ADDR_LEN], 2113 const uint8_t *ssid, size_t ssidlen) 2114 { 2115 struct ieee80211vap *vap = ni->ni_vap; 2116 struct ieee80211com *ic = ni->ni_ic; 2117 const struct ieee80211_txparam *tp; 2118 struct ieee80211_bpf_params params; 2119 struct ieee80211_frame *wh; 2120 const struct ieee80211_rateset *rs; 2121 struct mbuf *m; 2122 uint8_t *frm; 2123 int ret; 2124 2125 if (vap->iv_state == IEEE80211_S_CAC) { 2126 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 2127 "block %s frame in CAC state", "probe request"); 2128 vap->iv_stats.is_tx_badstate++; 2129 return EIO; /* XXX */ 2130 } 2131 2132 /* 2133 * Hold a reference on the node so it doesn't go away until after 2134 * the xmit is complete all the way in the driver. On error we 2135 * will remove our reference. 2136 */ 2137 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2138 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2139 __func__, __LINE__, 2140 ni, ether_sprintf(ni->ni_macaddr), 2141 ieee80211_node_refcnt(ni)+1); 2142 ieee80211_ref_node(ni); 2143 2144 /* 2145 * prreq frame format 2146 * [tlv] ssid 2147 * [tlv] supported rates 2148 * [tlv] RSN (optional) 2149 * [tlv] extended supported rates 2150 * [tlv] WPA (optional) 2151 * [tlv] user-specified ie's 2152 */ 2153 m = ieee80211_getmgtframe(&frm, 2154 ic->ic_headroom + sizeof(struct ieee80211_frame), 2155 2 + IEEE80211_NWID_LEN 2156 + 2 + IEEE80211_RATE_SIZE 2157 + sizeof(struct ieee80211_ie_wpa) 2158 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2159 + sizeof(struct ieee80211_ie_wpa) 2160 + (vap->iv_appie_probereq != NULL ? 2161 vap->iv_appie_probereq->ie_len : 0) 2162 ); 2163 if (m == NULL) { 2164 vap->iv_stats.is_tx_nobuf++; 2165 ieee80211_free_node(ni); 2166 return ENOMEM; 2167 } 2168 2169 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 2170 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 2171 frm = ieee80211_add_rates(frm, rs); 2172 frm = ieee80211_add_rsn(frm, vap); 2173 frm = ieee80211_add_xrates(frm, rs); 2174 frm = ieee80211_add_wpa(frm, vap); 2175 if (vap->iv_appie_probereq != NULL) 2176 frm = add_appie(frm, vap->iv_appie_probereq); 2177 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2178 2179 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 2180 ("leading space %zd", M_LEADINGSPACE(m))); 2181 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2182 if (m == NULL) { 2183 /* NB: cannot happen */ 2184 ieee80211_free_node(ni); 2185 return ENOMEM; 2186 } 2187 2188 IEEE80211_TX_LOCK(ic); 2189 wh = mtod(m, struct ieee80211_frame *); 2190 ieee80211_send_setup(ni, m, 2191 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 2192 IEEE80211_NONQOS_TID, sa, da, bssid); 2193 /* XXX power management? */ 2194 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2195 2196 M_WME_SETAC(m, WME_AC_BE); 2197 2198 IEEE80211_NODE_STAT(ni, tx_probereq); 2199 IEEE80211_NODE_STAT(ni, tx_mgmt); 2200 2201 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2202 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 2203 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 2204 (int)ssidlen, ssid); 2205 2206 memset(¶ms, 0, sizeof(params)); 2207 params.ibp_pri = M_WME_GETAC(m); 2208 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 2209 params.ibp_rate0 = tp->mgmtrate; 2210 if (IEEE80211_IS_MULTICAST(da)) { 2211 params.ibp_flags |= IEEE80211_BPF_NOACK; 2212 params.ibp_try0 = 1; 2213 } else 2214 params.ibp_try0 = tp->maxretry; 2215 params.ibp_power = ni->ni_txpower; 2216 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 2217 IEEE80211_TX_UNLOCK(ic); 2218 return (ret); 2219 } 2220 2221 /* 2222 * Calculate capability information for mgt frames. 2223 */ 2224 uint16_t 2225 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2226 { 2227 struct ieee80211com *ic = vap->iv_ic; 2228 uint16_t capinfo; 2229 2230 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2231 2232 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2233 capinfo = IEEE80211_CAPINFO_ESS; 2234 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2235 capinfo = IEEE80211_CAPINFO_IBSS; 2236 else 2237 capinfo = 0; 2238 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2239 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2240 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2241 IEEE80211_IS_CHAN_2GHZ(chan)) 2242 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2243 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2244 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2245 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2246 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2247 return capinfo; 2248 } 2249 2250 /* 2251 * Send a management frame. The node is for the destination (or ic_bss 2252 * when in station mode). Nodes other than ic_bss have their reference 2253 * count bumped to reflect our use for an indeterminant time. 2254 */ 2255 int 2256 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2257 { 2258 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2259 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2260 struct ieee80211vap *vap = ni->ni_vap; 2261 struct ieee80211com *ic = ni->ni_ic; 2262 struct ieee80211_node *bss = vap->iv_bss; 2263 struct ieee80211_bpf_params params; 2264 struct mbuf *m; 2265 uint8_t *frm; 2266 uint16_t capinfo; 2267 int has_challenge, is_shared_key, ret, status; 2268 2269 KASSERT(ni != NULL, ("null node")); 2270 2271 /* 2272 * Hold a reference on the node so it doesn't go away until after 2273 * the xmit is complete all the way in the driver. On error we 2274 * will remove our reference. 2275 */ 2276 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2277 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2278 __func__, __LINE__, 2279 ni, ether_sprintf(ni->ni_macaddr), 2280 ieee80211_node_refcnt(ni)+1); 2281 ieee80211_ref_node(ni); 2282 2283 memset(¶ms, 0, sizeof(params)); 2284 switch (type) { 2285 2286 case IEEE80211_FC0_SUBTYPE_AUTH: 2287 status = arg >> 16; 2288 arg &= 0xffff; 2289 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2290 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2291 ni->ni_challenge != NULL); 2292 2293 /* 2294 * Deduce whether we're doing open authentication or 2295 * shared key authentication. We do the latter if 2296 * we're in the middle of a shared key authentication 2297 * handshake or if we're initiating an authentication 2298 * request and configured to use shared key. 2299 */ 2300 is_shared_key = has_challenge || 2301 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2302 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2303 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2304 2305 m = ieee80211_getmgtframe(&frm, 2306 ic->ic_headroom + sizeof(struct ieee80211_frame), 2307 3 * sizeof(uint16_t) 2308 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2309 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2310 ); 2311 if (m == NULL) 2312 senderr(ENOMEM, is_tx_nobuf); 2313 2314 ((uint16_t *)frm)[0] = 2315 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2316 : htole16(IEEE80211_AUTH_ALG_OPEN); 2317 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2318 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2319 2320 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2321 ((uint16_t *)frm)[3] = 2322 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2323 IEEE80211_ELEMID_CHALLENGE); 2324 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2325 IEEE80211_CHALLENGE_LEN); 2326 m->m_pkthdr.len = m->m_len = 2327 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2328 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2329 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2330 "request encrypt frame (%s)", __func__); 2331 /* mark frame for encryption */ 2332 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2333 } 2334 } else 2335 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2336 2337 /* XXX not right for shared key */ 2338 if (status == IEEE80211_STATUS_SUCCESS) 2339 IEEE80211_NODE_STAT(ni, tx_auth); 2340 else 2341 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2342 2343 if (vap->iv_opmode == IEEE80211_M_STA) 2344 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2345 (void *) vap->iv_state); 2346 break; 2347 2348 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2349 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2350 "send station deauthenticate (reason %d)", arg); 2351 m = ieee80211_getmgtframe(&frm, 2352 ic->ic_headroom + sizeof(struct ieee80211_frame), 2353 sizeof(uint16_t)); 2354 if (m == NULL) 2355 senderr(ENOMEM, is_tx_nobuf); 2356 *(uint16_t *)frm = htole16(arg); /* reason */ 2357 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2358 2359 IEEE80211_NODE_STAT(ni, tx_deauth); 2360 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2361 2362 ieee80211_node_unauthorize(ni); /* port closed */ 2363 break; 2364 2365 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2366 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2367 /* 2368 * asreq frame format 2369 * [2] capability information 2370 * [2] listen interval 2371 * [6*] current AP address (reassoc only) 2372 * [tlv] ssid 2373 * [tlv] supported rates 2374 * [tlv] extended supported rates 2375 * [4] power capability (optional) 2376 * [28] supported channels (optional) 2377 * [tlv] HT capabilities 2378 * [tlv] WME (optional) 2379 * [tlv] Vendor OUI HT capabilities (optional) 2380 * [tlv] Atheros capabilities (if negotiated) 2381 * [tlv] AppIE's (optional) 2382 */ 2383 m = ieee80211_getmgtframe(&frm, 2384 ic->ic_headroom + sizeof(struct ieee80211_frame), 2385 sizeof(uint16_t) 2386 + sizeof(uint16_t) 2387 + IEEE80211_ADDR_LEN 2388 + 2 + IEEE80211_NWID_LEN 2389 + 2 + IEEE80211_RATE_SIZE 2390 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2391 + 4 2392 + 2 + 26 2393 + sizeof(struct ieee80211_wme_info) 2394 + sizeof(struct ieee80211_ie_htcap) 2395 + 4 + sizeof(struct ieee80211_ie_htcap) 2396 #ifdef IEEE80211_SUPPORT_SUPERG 2397 + sizeof(struct ieee80211_ath_ie) 2398 #endif 2399 + (vap->iv_appie_wpa != NULL ? 2400 vap->iv_appie_wpa->ie_len : 0) 2401 + (vap->iv_appie_assocreq != NULL ? 2402 vap->iv_appie_assocreq->ie_len : 0) 2403 ); 2404 if (m == NULL) 2405 senderr(ENOMEM, is_tx_nobuf); 2406 2407 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2408 ("wrong mode %u", vap->iv_opmode)); 2409 capinfo = IEEE80211_CAPINFO_ESS; 2410 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2411 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2412 /* 2413 * NB: Some 11a AP's reject the request when 2414 * short premable is set. 2415 */ 2416 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2417 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2418 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2419 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2420 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2421 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2422 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2423 (vap->iv_flags & IEEE80211_F_DOTH)) 2424 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2425 *(uint16_t *)frm = htole16(capinfo); 2426 frm += 2; 2427 2428 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2429 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2430 bss->ni_intval)); 2431 frm += 2; 2432 2433 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2434 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2435 frm += IEEE80211_ADDR_LEN; 2436 } 2437 2438 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2439 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2440 frm = ieee80211_add_rsn(frm, vap); 2441 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2442 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2443 frm = ieee80211_add_powercapability(frm, 2444 ic->ic_curchan); 2445 frm = ieee80211_add_supportedchannels(frm, ic); 2446 } 2447 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2448 ni->ni_ies.htcap_ie != NULL && 2449 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2450 frm = ieee80211_add_htcap(frm, ni); 2451 frm = ieee80211_add_wpa(frm, vap); 2452 if ((ic->ic_flags & IEEE80211_F_WME) && 2453 ni->ni_ies.wme_ie != NULL) 2454 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2455 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2456 ni->ni_ies.htcap_ie != NULL && 2457 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2458 frm = ieee80211_add_htcap_vendor(frm, ni); 2459 #ifdef IEEE80211_SUPPORT_SUPERG 2460 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2461 frm = ieee80211_add_ath(frm, 2462 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2463 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2464 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2465 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2466 } 2467 #endif /* IEEE80211_SUPPORT_SUPERG */ 2468 if (vap->iv_appie_assocreq != NULL) 2469 frm = add_appie(frm, vap->iv_appie_assocreq); 2470 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2471 2472 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2473 (void *) vap->iv_state); 2474 break; 2475 2476 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2477 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2478 /* 2479 * asresp frame format 2480 * [2] capability information 2481 * [2] status 2482 * [2] association ID 2483 * [tlv] supported rates 2484 * [tlv] extended supported rates 2485 * [tlv] HT capabilities (standard, if STA enabled) 2486 * [tlv] HT information (standard, if STA enabled) 2487 * [tlv] WME (if configured and STA enabled) 2488 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2489 * [tlv] HT information (vendor OUI, if STA enabled) 2490 * [tlv] Atheros capabilities (if STA enabled) 2491 * [tlv] AppIE's (optional) 2492 */ 2493 m = ieee80211_getmgtframe(&frm, 2494 ic->ic_headroom + sizeof(struct ieee80211_frame), 2495 sizeof(uint16_t) 2496 + sizeof(uint16_t) 2497 + sizeof(uint16_t) 2498 + 2 + IEEE80211_RATE_SIZE 2499 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2500 + sizeof(struct ieee80211_ie_htcap) + 4 2501 + sizeof(struct ieee80211_ie_htinfo) + 4 2502 + sizeof(struct ieee80211_wme_param) 2503 #ifdef IEEE80211_SUPPORT_SUPERG 2504 + sizeof(struct ieee80211_ath_ie) 2505 #endif 2506 + (vap->iv_appie_assocresp != NULL ? 2507 vap->iv_appie_assocresp->ie_len : 0) 2508 ); 2509 if (m == NULL) 2510 senderr(ENOMEM, is_tx_nobuf); 2511 2512 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2513 *(uint16_t *)frm = htole16(capinfo); 2514 frm += 2; 2515 2516 *(uint16_t *)frm = htole16(arg); /* status */ 2517 frm += 2; 2518 2519 if (arg == IEEE80211_STATUS_SUCCESS) { 2520 *(uint16_t *)frm = htole16(ni->ni_associd); 2521 IEEE80211_NODE_STAT(ni, tx_assoc); 2522 } else 2523 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2524 frm += 2; 2525 2526 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2527 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2528 /* NB: respond according to what we received */ 2529 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2530 frm = ieee80211_add_htcap(frm, ni); 2531 frm = ieee80211_add_htinfo(frm, ni); 2532 } 2533 if ((vap->iv_flags & IEEE80211_F_WME) && 2534 ni->ni_ies.wme_ie != NULL) 2535 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2536 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2537 frm = ieee80211_add_htcap_vendor(frm, ni); 2538 frm = ieee80211_add_htinfo_vendor(frm, ni); 2539 } 2540 #ifdef IEEE80211_SUPPORT_SUPERG 2541 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2542 frm = ieee80211_add_ath(frm, 2543 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2544 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2545 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2546 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2547 #endif /* IEEE80211_SUPPORT_SUPERG */ 2548 if (vap->iv_appie_assocresp != NULL) 2549 frm = add_appie(frm, vap->iv_appie_assocresp); 2550 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2551 break; 2552 2553 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2554 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2555 "send station disassociate (reason %d)", arg); 2556 m = ieee80211_getmgtframe(&frm, 2557 ic->ic_headroom + sizeof(struct ieee80211_frame), 2558 sizeof(uint16_t)); 2559 if (m == NULL) 2560 senderr(ENOMEM, is_tx_nobuf); 2561 *(uint16_t *)frm = htole16(arg); /* reason */ 2562 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2563 2564 IEEE80211_NODE_STAT(ni, tx_disassoc); 2565 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2566 break; 2567 2568 default: 2569 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2570 "invalid mgmt frame type %u", type); 2571 senderr(EINVAL, is_tx_unknownmgt); 2572 /* NOTREACHED */ 2573 } 2574 2575 /* NB: force non-ProbeResp frames to the highest queue */ 2576 params.ibp_pri = WME_AC_VO; 2577 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2578 /* NB: we know all frames are unicast */ 2579 params.ibp_try0 = bss->ni_txparms->maxretry; 2580 params.ibp_power = bss->ni_txpower; 2581 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2582 bad: 2583 ieee80211_free_node(ni); 2584 return ret; 2585 #undef senderr 2586 #undef HTFLAGS 2587 } 2588 2589 /* 2590 * Return an mbuf with a probe response frame in it. 2591 * Space is left to prepend and 802.11 header at the 2592 * front but it's left to the caller to fill in. 2593 */ 2594 struct mbuf * 2595 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2596 { 2597 struct ieee80211vap *vap = bss->ni_vap; 2598 struct ieee80211com *ic = bss->ni_ic; 2599 const struct ieee80211_rateset *rs; 2600 struct mbuf *m; 2601 uint16_t capinfo; 2602 uint8_t *frm; 2603 2604 /* 2605 * probe response frame format 2606 * [8] time stamp 2607 * [2] beacon interval 2608 * [2] cabability information 2609 * [tlv] ssid 2610 * [tlv] supported rates 2611 * [tlv] parameter set (FH/DS) 2612 * [tlv] parameter set (IBSS) 2613 * [tlv] country (optional) 2614 * [3] power control (optional) 2615 * [5] channel switch announcement (CSA) (optional) 2616 * [tlv] extended rate phy (ERP) 2617 * [tlv] extended supported rates 2618 * [tlv] RSN (optional) 2619 * [tlv] HT capabilities 2620 * [tlv] HT information 2621 * [tlv] WPA (optional) 2622 * [tlv] WME (optional) 2623 * [tlv] Vendor OUI HT capabilities (optional) 2624 * [tlv] Vendor OUI HT information (optional) 2625 * [tlv] Atheros capabilities 2626 * [tlv] AppIE's (optional) 2627 * [tlv] Mesh ID (MBSS) 2628 * [tlv] Mesh Conf (MBSS) 2629 */ 2630 m = ieee80211_getmgtframe(&frm, 2631 ic->ic_headroom + sizeof(struct ieee80211_frame), 2632 8 2633 + sizeof(uint16_t) 2634 + sizeof(uint16_t) 2635 + 2 + IEEE80211_NWID_LEN 2636 + 2 + IEEE80211_RATE_SIZE 2637 + 7 /* max(7,3) */ 2638 + IEEE80211_COUNTRY_MAX_SIZE 2639 + 3 2640 + sizeof(struct ieee80211_csa_ie) 2641 + sizeof(struct ieee80211_quiet_ie) 2642 + 3 2643 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2644 + sizeof(struct ieee80211_ie_wpa) 2645 + sizeof(struct ieee80211_ie_htcap) 2646 + sizeof(struct ieee80211_ie_htinfo) 2647 + sizeof(struct ieee80211_ie_wpa) 2648 + sizeof(struct ieee80211_wme_param) 2649 + 4 + sizeof(struct ieee80211_ie_htcap) 2650 + 4 + sizeof(struct ieee80211_ie_htinfo) 2651 #ifdef IEEE80211_SUPPORT_SUPERG 2652 + sizeof(struct ieee80211_ath_ie) 2653 #endif 2654 #ifdef IEEE80211_SUPPORT_MESH 2655 + 2 + IEEE80211_MESHID_LEN 2656 + sizeof(struct ieee80211_meshconf_ie) 2657 #endif 2658 + (vap->iv_appie_proberesp != NULL ? 2659 vap->iv_appie_proberesp->ie_len : 0) 2660 ); 2661 if (m == NULL) { 2662 vap->iv_stats.is_tx_nobuf++; 2663 return NULL; 2664 } 2665 2666 memset(frm, 0, 8); /* timestamp should be filled later */ 2667 frm += 8; 2668 *(uint16_t *)frm = htole16(bss->ni_intval); 2669 frm += 2; 2670 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2671 *(uint16_t *)frm = htole16(capinfo); 2672 frm += 2; 2673 2674 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2675 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2676 frm = ieee80211_add_rates(frm, rs); 2677 2678 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2679 *frm++ = IEEE80211_ELEMID_FHPARMS; 2680 *frm++ = 5; 2681 *frm++ = bss->ni_fhdwell & 0x00ff; 2682 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2683 *frm++ = IEEE80211_FH_CHANSET( 2684 ieee80211_chan2ieee(ic, bss->ni_chan)); 2685 *frm++ = IEEE80211_FH_CHANPAT( 2686 ieee80211_chan2ieee(ic, bss->ni_chan)); 2687 *frm++ = bss->ni_fhindex; 2688 } else { 2689 *frm++ = IEEE80211_ELEMID_DSPARMS; 2690 *frm++ = 1; 2691 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2692 } 2693 2694 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2695 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2696 *frm++ = 2; 2697 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2698 } 2699 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2700 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2701 frm = ieee80211_add_countryie(frm, ic); 2702 if (vap->iv_flags & IEEE80211_F_DOTH) { 2703 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2704 frm = ieee80211_add_powerconstraint(frm, vap); 2705 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2706 frm = ieee80211_add_csa(frm, vap); 2707 } 2708 if (vap->iv_flags & IEEE80211_F_DOTH) { 2709 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2710 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2711 if (vap->iv_quiet) 2712 frm = ieee80211_add_quiet(frm, vap); 2713 } 2714 } 2715 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2716 frm = ieee80211_add_erp(frm, ic); 2717 frm = ieee80211_add_xrates(frm, rs); 2718 frm = ieee80211_add_rsn(frm, vap); 2719 /* 2720 * NB: legacy 11b clients do not get certain ie's. 2721 * The caller identifies such clients by passing 2722 * a token in legacy to us. Could expand this to be 2723 * any legacy client for stuff like HT ie's. 2724 */ 2725 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2726 legacy != IEEE80211_SEND_LEGACY_11B) { 2727 frm = ieee80211_add_htcap(frm, bss); 2728 frm = ieee80211_add_htinfo(frm, bss); 2729 } 2730 frm = ieee80211_add_wpa(frm, vap); 2731 if (vap->iv_flags & IEEE80211_F_WME) 2732 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2733 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2734 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2735 legacy != IEEE80211_SEND_LEGACY_11B) { 2736 frm = ieee80211_add_htcap_vendor(frm, bss); 2737 frm = ieee80211_add_htinfo_vendor(frm, bss); 2738 } 2739 #ifdef IEEE80211_SUPPORT_SUPERG 2740 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2741 legacy != IEEE80211_SEND_LEGACY_11B) 2742 frm = ieee80211_add_athcaps(frm, bss); 2743 #endif 2744 if (vap->iv_appie_proberesp != NULL) 2745 frm = add_appie(frm, vap->iv_appie_proberesp); 2746 #ifdef IEEE80211_SUPPORT_MESH 2747 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2748 frm = ieee80211_add_meshid(frm, vap); 2749 frm = ieee80211_add_meshconf(frm, vap); 2750 } 2751 #endif 2752 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2753 2754 return m; 2755 } 2756 2757 /* 2758 * Send a probe response frame to the specified mac address. 2759 * This does not go through the normal mgt frame api so we 2760 * can specify the destination address and re-use the bss node 2761 * for the sta reference. 2762 */ 2763 int 2764 ieee80211_send_proberesp(struct ieee80211vap *vap, 2765 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2766 { 2767 struct ieee80211_node *bss = vap->iv_bss; 2768 struct ieee80211com *ic = vap->iv_ic; 2769 struct ieee80211_frame *wh; 2770 struct mbuf *m; 2771 int ret; 2772 2773 if (vap->iv_state == IEEE80211_S_CAC) { 2774 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2775 "block %s frame in CAC state", "probe response"); 2776 vap->iv_stats.is_tx_badstate++; 2777 return EIO; /* XXX */ 2778 } 2779 2780 /* 2781 * Hold a reference on the node so it doesn't go away until after 2782 * the xmit is complete all the way in the driver. On error we 2783 * will remove our reference. 2784 */ 2785 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2786 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2787 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2788 ieee80211_node_refcnt(bss)+1); 2789 ieee80211_ref_node(bss); 2790 2791 m = ieee80211_alloc_proberesp(bss, legacy); 2792 if (m == NULL) { 2793 ieee80211_free_node(bss); 2794 return ENOMEM; 2795 } 2796 2797 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2798 KASSERT(m != NULL, ("no room for header")); 2799 2800 IEEE80211_TX_LOCK(ic); 2801 wh = mtod(m, struct ieee80211_frame *); 2802 ieee80211_send_setup(bss, m, 2803 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2804 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2805 /* XXX power management? */ 2806 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2807 2808 M_WME_SETAC(m, WME_AC_BE); 2809 2810 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2811 "send probe resp on channel %u to %s%s\n", 2812 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2813 legacy ? " <legacy>" : ""); 2814 IEEE80211_NODE_STAT(bss, tx_mgmt); 2815 2816 ret = ieee80211_raw_output(vap, bss, m, NULL); 2817 IEEE80211_TX_UNLOCK(ic); 2818 return (ret); 2819 } 2820 2821 /* 2822 * Allocate and build a RTS (Request To Send) control frame. 2823 */ 2824 struct mbuf * 2825 ieee80211_alloc_rts(struct ieee80211com *ic, 2826 const uint8_t ra[IEEE80211_ADDR_LEN], 2827 const uint8_t ta[IEEE80211_ADDR_LEN], 2828 uint16_t dur) 2829 { 2830 struct ieee80211_frame_rts *rts; 2831 struct mbuf *m; 2832 2833 /* XXX honor ic_headroom */ 2834 m = m_gethdr(M_NOWAIT, MT_DATA); 2835 if (m != NULL) { 2836 rts = mtod(m, struct ieee80211_frame_rts *); 2837 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2838 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2839 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2840 *(u_int16_t *)rts->i_dur = htole16(dur); 2841 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2842 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2843 2844 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2845 } 2846 return m; 2847 } 2848 2849 /* 2850 * Allocate and build a CTS (Clear To Send) control frame. 2851 */ 2852 struct mbuf * 2853 ieee80211_alloc_cts(struct ieee80211com *ic, 2854 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2855 { 2856 struct ieee80211_frame_cts *cts; 2857 struct mbuf *m; 2858 2859 /* XXX honor ic_headroom */ 2860 m = m_gethdr(M_NOWAIT, MT_DATA); 2861 if (m != NULL) { 2862 cts = mtod(m, struct ieee80211_frame_cts *); 2863 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2864 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2865 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2866 *(u_int16_t *)cts->i_dur = htole16(dur); 2867 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2868 2869 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2870 } 2871 return m; 2872 } 2873 2874 static void 2875 ieee80211_tx_mgt_timeout(void *arg) 2876 { 2877 struct ieee80211vap *vap = arg; 2878 2879 IEEE80211_LOCK(vap->iv_ic); 2880 if (vap->iv_state != IEEE80211_S_INIT && 2881 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2882 /* 2883 * NB: it's safe to specify a timeout as the reason here; 2884 * it'll only be used in the right state. 2885 */ 2886 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN, 2887 IEEE80211_SCAN_FAIL_TIMEOUT); 2888 } 2889 IEEE80211_UNLOCK(vap->iv_ic); 2890 } 2891 2892 /* 2893 * This is the callback set on net80211-sourced transmitted 2894 * authentication request frames. 2895 * 2896 * This does a couple of things: 2897 * 2898 * + If the frame transmitted was a success, it schedules a future 2899 * event which will transition the interface to scan. 2900 * If a state transition _then_ occurs before that event occurs, 2901 * said state transition will cancel this callout. 2902 * 2903 * + If the frame transmit was a failure, it immediately schedules 2904 * the transition back to scan. 2905 */ 2906 static void 2907 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2908 { 2909 struct ieee80211vap *vap = ni->ni_vap; 2910 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2911 2912 /* 2913 * Frame transmit completed; arrange timer callback. If 2914 * transmit was successfuly we wait for response. Otherwise 2915 * we arrange an immediate callback instead of doing the 2916 * callback directly since we don't know what state the driver 2917 * is in (e.g. what locks it is holding). This work should 2918 * not be too time-critical and not happen too often so the 2919 * added overhead is acceptable. 2920 * 2921 * XXX what happens if !acked but response shows up before callback? 2922 */ 2923 if (vap->iv_state == ostate) { 2924 callout_reset(&vap->iv_mgtsend, 2925 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2926 ieee80211_tx_mgt_timeout, vap); 2927 } 2928 } 2929 2930 static void 2931 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2932 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2933 { 2934 struct ieee80211vap *vap = ni->ni_vap; 2935 struct ieee80211com *ic = ni->ni_ic; 2936 struct ieee80211_rateset *rs = &ni->ni_rates; 2937 uint16_t capinfo; 2938 2939 /* 2940 * beacon frame format 2941 * [8] time stamp 2942 * [2] beacon interval 2943 * [2] cabability information 2944 * [tlv] ssid 2945 * [tlv] supported rates 2946 * [3] parameter set (DS) 2947 * [8] CF parameter set (optional) 2948 * [tlv] parameter set (IBSS/TIM) 2949 * [tlv] country (optional) 2950 * [3] power control (optional) 2951 * [5] channel switch announcement (CSA) (optional) 2952 * [tlv] extended rate phy (ERP) 2953 * [tlv] extended supported rates 2954 * [tlv] RSN parameters 2955 * [tlv] HT capabilities 2956 * [tlv] HT information 2957 * XXX Vendor-specific OIDs (e.g. Atheros) 2958 * [tlv] WPA parameters 2959 * [tlv] WME parameters 2960 * [tlv] Vendor OUI HT capabilities (optional) 2961 * [tlv] Vendor OUI HT information (optional) 2962 * [tlv] Atheros capabilities (optional) 2963 * [tlv] TDMA parameters (optional) 2964 * [tlv] Mesh ID (MBSS) 2965 * [tlv] Mesh Conf (MBSS) 2966 * [tlv] application data (optional) 2967 */ 2968 2969 memset(bo, 0, sizeof(*bo)); 2970 2971 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2972 frm += 8; 2973 *(uint16_t *)frm = htole16(ni->ni_intval); 2974 frm += 2; 2975 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2976 bo->bo_caps = (uint16_t *)frm; 2977 *(uint16_t *)frm = htole16(capinfo); 2978 frm += 2; 2979 *frm++ = IEEE80211_ELEMID_SSID; 2980 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2981 *frm++ = ni->ni_esslen; 2982 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2983 frm += ni->ni_esslen; 2984 } else 2985 *frm++ = 0; 2986 frm = ieee80211_add_rates(frm, rs); 2987 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2988 *frm++ = IEEE80211_ELEMID_DSPARMS; 2989 *frm++ = 1; 2990 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2991 } 2992 if (ic->ic_flags & IEEE80211_F_PCF) { 2993 bo->bo_cfp = frm; 2994 frm = ieee80211_add_cfparms(frm, ic); 2995 } 2996 bo->bo_tim = frm; 2997 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2998 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2999 *frm++ = 2; 3000 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 3001 bo->bo_tim_len = 0; 3002 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3003 vap->iv_opmode == IEEE80211_M_MBSS) { 3004 /* TIM IE is the same for Mesh and Hostap */ 3005 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 3006 3007 tie->tim_ie = IEEE80211_ELEMID_TIM; 3008 tie->tim_len = 4; /* length */ 3009 tie->tim_count = 0; /* DTIM count */ 3010 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 3011 tie->tim_bitctl = 0; /* bitmap control */ 3012 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 3013 frm += sizeof(struct ieee80211_tim_ie); 3014 bo->bo_tim_len = 1; 3015 } 3016 bo->bo_tim_trailer = frm; 3017 if ((vap->iv_flags & IEEE80211_F_DOTH) || 3018 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 3019 frm = ieee80211_add_countryie(frm, ic); 3020 if (vap->iv_flags & IEEE80211_F_DOTH) { 3021 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 3022 frm = ieee80211_add_powerconstraint(frm, vap); 3023 bo->bo_csa = frm; 3024 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 3025 frm = ieee80211_add_csa(frm, vap); 3026 } else 3027 bo->bo_csa = frm; 3028 3029 if (vap->iv_flags & IEEE80211_F_DOTH) { 3030 bo->bo_quiet = frm; 3031 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3032 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 3033 if (vap->iv_quiet) 3034 frm = ieee80211_add_quiet(frm,vap); 3035 } 3036 } else 3037 bo->bo_quiet = frm; 3038 3039 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 3040 bo->bo_erp = frm; 3041 frm = ieee80211_add_erp(frm, ic); 3042 } 3043 frm = ieee80211_add_xrates(frm, rs); 3044 frm = ieee80211_add_rsn(frm, vap); 3045 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 3046 frm = ieee80211_add_htcap(frm, ni); 3047 bo->bo_htinfo = frm; 3048 frm = ieee80211_add_htinfo(frm, ni); 3049 } 3050 frm = ieee80211_add_wpa(frm, vap); 3051 if (vap->iv_flags & IEEE80211_F_WME) { 3052 bo->bo_wme = frm; 3053 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 3054 } 3055 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 3056 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 3057 frm = ieee80211_add_htcap_vendor(frm, ni); 3058 frm = ieee80211_add_htinfo_vendor(frm, ni); 3059 } 3060 #ifdef IEEE80211_SUPPORT_SUPERG 3061 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 3062 bo->bo_ath = frm; 3063 frm = ieee80211_add_athcaps(frm, ni); 3064 } 3065 #endif 3066 #ifdef IEEE80211_SUPPORT_TDMA 3067 if (vap->iv_caps & IEEE80211_C_TDMA) { 3068 bo->bo_tdma = frm; 3069 frm = ieee80211_add_tdma(frm, vap); 3070 } 3071 #endif 3072 if (vap->iv_appie_beacon != NULL) { 3073 bo->bo_appie = frm; 3074 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 3075 frm = add_appie(frm, vap->iv_appie_beacon); 3076 } 3077 #ifdef IEEE80211_SUPPORT_MESH 3078 if (vap->iv_opmode == IEEE80211_M_MBSS) { 3079 frm = ieee80211_add_meshid(frm, vap); 3080 bo->bo_meshconf = frm; 3081 frm = ieee80211_add_meshconf(frm, vap); 3082 } 3083 #endif 3084 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 3085 bo->bo_csa_trailer_len = frm - bo->bo_csa; 3086 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 3087 } 3088 3089 /* 3090 * Allocate a beacon frame and fillin the appropriate bits. 3091 */ 3092 struct mbuf * 3093 ieee80211_beacon_alloc(struct ieee80211_node *ni, 3094 struct ieee80211_beacon_offsets *bo) 3095 { 3096 struct ieee80211vap *vap = ni->ni_vap; 3097 struct ieee80211com *ic = ni->ni_ic; 3098 struct ifnet *ifp = vap->iv_ifp; 3099 struct ieee80211_frame *wh; 3100 struct mbuf *m; 3101 int pktlen; 3102 uint8_t *frm; 3103 3104 /* 3105 * beacon frame format 3106 * [8] time stamp 3107 * [2] beacon interval 3108 * [2] cabability information 3109 * [tlv] ssid 3110 * [tlv] supported rates 3111 * [3] parameter set (DS) 3112 * [8] CF parameter set (optional) 3113 * [tlv] parameter set (IBSS/TIM) 3114 * [tlv] country (optional) 3115 * [3] power control (optional) 3116 * [5] channel switch announcement (CSA) (optional) 3117 * [tlv] extended rate phy (ERP) 3118 * [tlv] extended supported rates 3119 * [tlv] RSN parameters 3120 * [tlv] HT capabilities 3121 * [tlv] HT information 3122 * [tlv] Vendor OUI HT capabilities (optional) 3123 * [tlv] Vendor OUI HT information (optional) 3124 * XXX Vendor-specific OIDs (e.g. Atheros) 3125 * [tlv] WPA parameters 3126 * [tlv] WME parameters 3127 * [tlv] TDMA parameters (optional) 3128 * [tlv] Mesh ID (MBSS) 3129 * [tlv] Mesh Conf (MBSS) 3130 * [tlv] application data (optional) 3131 * NB: we allocate the max space required for the TIM bitmap. 3132 * XXX how big is this? 3133 */ 3134 pktlen = 8 /* time stamp */ 3135 + sizeof(uint16_t) /* beacon interval */ 3136 + sizeof(uint16_t) /* capabilities */ 3137 + 2 + ni->ni_esslen /* ssid */ 3138 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 3139 + 2 + 1 /* DS parameters */ 3140 + 2 + 6 /* CF parameters */ 3141 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 3142 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 3143 + 2 + 1 /* power control */ 3144 + sizeof(struct ieee80211_csa_ie) /* CSA */ 3145 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 3146 + 2 + 1 /* ERP */ 3147 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 3148 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 3149 2*sizeof(struct ieee80211_ie_wpa) : 0) 3150 /* XXX conditional? */ 3151 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 3152 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 3153 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 3154 sizeof(struct ieee80211_wme_param) : 0) 3155 #ifdef IEEE80211_SUPPORT_SUPERG 3156 + sizeof(struct ieee80211_ath_ie) /* ATH */ 3157 #endif 3158 #ifdef IEEE80211_SUPPORT_TDMA 3159 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 3160 sizeof(struct ieee80211_tdma_param) : 0) 3161 #endif 3162 #ifdef IEEE80211_SUPPORT_MESH 3163 + 2 + ni->ni_meshidlen 3164 + sizeof(struct ieee80211_meshconf_ie) 3165 #endif 3166 + IEEE80211_MAX_APPIE 3167 ; 3168 m = ieee80211_getmgtframe(&frm, 3169 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 3170 if (m == NULL) { 3171 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 3172 "%s: cannot get buf; size %u\n", __func__, pktlen); 3173 vap->iv_stats.is_tx_nobuf++; 3174 return NULL; 3175 } 3176 ieee80211_beacon_construct(m, frm, bo, ni); 3177 3178 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 3179 KASSERT(m != NULL, ("no space for 802.11 header?")); 3180 wh = mtod(m, struct ieee80211_frame *); 3181 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 3182 IEEE80211_FC0_SUBTYPE_BEACON; 3183 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 3184 *(uint16_t *)wh->i_dur = 0; 3185 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 3186 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 3187 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 3188 *(uint16_t *)wh->i_seq = 0; 3189 3190 return m; 3191 } 3192 3193 /* 3194 * Update the dynamic parts of a beacon frame based on the current state. 3195 */ 3196 int 3197 ieee80211_beacon_update(struct ieee80211_node *ni, 3198 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 3199 { 3200 struct ieee80211vap *vap = ni->ni_vap; 3201 struct ieee80211com *ic = ni->ni_ic; 3202 int len_changed = 0; 3203 uint16_t capinfo; 3204 struct ieee80211_frame *wh; 3205 ieee80211_seq seqno; 3206 3207 IEEE80211_LOCK(ic); 3208 /* 3209 * Handle 11h channel change when we've reached the count. 3210 * We must recalculate the beacon frame contents to account 3211 * for the new channel. Note we do this only for the first 3212 * vap that reaches this point; subsequent vaps just update 3213 * their beacon state to reflect the recalculated channel. 3214 */ 3215 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3216 vap->iv_csa_count == ic->ic_csa_count) { 3217 vap->iv_csa_count = 0; 3218 /* 3219 * Effect channel change before reconstructing the beacon 3220 * frame contents as many places reference ni_chan. 3221 */ 3222 if (ic->ic_csa_newchan != NULL) 3223 ieee80211_csa_completeswitch(ic); 3224 /* 3225 * NB: ieee80211_beacon_construct clears all pending 3226 * updates in bo_flags so we don't need to explicitly 3227 * clear IEEE80211_BEACON_CSA. 3228 */ 3229 ieee80211_beacon_construct(m, 3230 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 3231 3232 /* XXX do WME aggressive mode processing? */ 3233 IEEE80211_UNLOCK(ic); 3234 return 1; /* just assume length changed */ 3235 } 3236 3237 wh = mtod(m, struct ieee80211_frame *); 3238 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3239 *(uint16_t *)&wh->i_seq[0] = 3240 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3241 M_SEQNO_SET(m, seqno); 3242 3243 /* XXX faster to recalculate entirely or just changes? */ 3244 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3245 *bo->bo_caps = htole16(capinfo); 3246 3247 if (vap->iv_flags & IEEE80211_F_WME) { 3248 struct ieee80211_wme_state *wme = &ic->ic_wme; 3249 3250 /* 3251 * Check for agressive mode change. When there is 3252 * significant high priority traffic in the BSS 3253 * throttle back BE traffic by using conservative 3254 * parameters. Otherwise BE uses agressive params 3255 * to optimize performance of legacy/non-QoS traffic. 3256 */ 3257 if (wme->wme_flags & WME_F_AGGRMODE) { 3258 if (wme->wme_hipri_traffic > 3259 wme->wme_hipri_switch_thresh) { 3260 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3261 "%s: traffic %u, disable aggressive mode\n", 3262 __func__, wme->wme_hipri_traffic); 3263 wme->wme_flags &= ~WME_F_AGGRMODE; 3264 ieee80211_wme_updateparams_locked(vap); 3265 wme->wme_hipri_traffic = 3266 wme->wme_hipri_switch_hysteresis; 3267 } else 3268 wme->wme_hipri_traffic = 0; 3269 } else { 3270 if (wme->wme_hipri_traffic <= 3271 wme->wme_hipri_switch_thresh) { 3272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3273 "%s: traffic %u, enable aggressive mode\n", 3274 __func__, wme->wme_hipri_traffic); 3275 wme->wme_flags |= WME_F_AGGRMODE; 3276 ieee80211_wme_updateparams_locked(vap); 3277 wme->wme_hipri_traffic = 0; 3278 } else 3279 wme->wme_hipri_traffic = 3280 wme->wme_hipri_switch_hysteresis; 3281 } 3282 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3283 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3284 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3285 } 3286 } 3287 3288 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3289 ieee80211_ht_update_beacon(vap, bo); 3290 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3291 } 3292 #ifdef IEEE80211_SUPPORT_TDMA 3293 if (vap->iv_caps & IEEE80211_C_TDMA) { 3294 /* 3295 * NB: the beacon is potentially updated every TBTT. 3296 */ 3297 ieee80211_tdma_update_beacon(vap, bo); 3298 } 3299 #endif 3300 #ifdef IEEE80211_SUPPORT_MESH 3301 if (vap->iv_opmode == IEEE80211_M_MBSS) 3302 ieee80211_mesh_update_beacon(vap, bo); 3303 #endif 3304 3305 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3306 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3307 struct ieee80211_tim_ie *tie = 3308 (struct ieee80211_tim_ie *) bo->bo_tim; 3309 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3310 u_int timlen, timoff, i; 3311 /* 3312 * ATIM/DTIM needs updating. If it fits in the 3313 * current space allocated then just copy in the 3314 * new bits. Otherwise we need to move any trailing 3315 * data to make room. Note that we know there is 3316 * contiguous space because ieee80211_beacon_allocate 3317 * insures there is space in the mbuf to write a 3318 * maximal-size virtual bitmap (based on iv_max_aid). 3319 */ 3320 /* 3321 * Calculate the bitmap size and offset, copy any 3322 * trailer out of the way, and then copy in the 3323 * new bitmap and update the information element. 3324 * Note that the tim bitmap must contain at least 3325 * one byte and any offset must be even. 3326 */ 3327 if (vap->iv_ps_pending != 0) { 3328 timoff = 128; /* impossibly large */ 3329 for (i = 0; i < vap->iv_tim_len; i++) 3330 if (vap->iv_tim_bitmap[i]) { 3331 timoff = i &~ 1; 3332 break; 3333 } 3334 KASSERT(timoff != 128, ("tim bitmap empty!")); 3335 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3336 if (vap->iv_tim_bitmap[i]) 3337 break; 3338 timlen = 1 + (i - timoff); 3339 } else { 3340 timoff = 0; 3341 timlen = 1; 3342 } 3343 if (timlen != bo->bo_tim_len) { 3344 /* copy up/down trailer */ 3345 int adjust = tie->tim_bitmap+timlen 3346 - bo->bo_tim_trailer; 3347 ovbcopy(bo->bo_tim_trailer, 3348 bo->bo_tim_trailer+adjust, 3349 bo->bo_tim_trailer_len); 3350 bo->bo_tim_trailer += adjust; 3351 bo->bo_erp += adjust; 3352 bo->bo_htinfo += adjust; 3353 #ifdef IEEE80211_SUPPORT_SUPERG 3354 bo->bo_ath += adjust; 3355 #endif 3356 #ifdef IEEE80211_SUPPORT_TDMA 3357 bo->bo_tdma += adjust; 3358 #endif 3359 #ifdef IEEE80211_SUPPORT_MESH 3360 bo->bo_meshconf += adjust; 3361 #endif 3362 bo->bo_appie += adjust; 3363 bo->bo_wme += adjust; 3364 bo->bo_csa += adjust; 3365 bo->bo_quiet += adjust; 3366 bo->bo_tim_len = timlen; 3367 3368 /* update information element */ 3369 tie->tim_len = 3 + timlen; 3370 tie->tim_bitctl = timoff; 3371 len_changed = 1; 3372 } 3373 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3374 bo->bo_tim_len); 3375 3376 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3377 3378 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3379 "%s: TIM updated, pending %u, off %u, len %u\n", 3380 __func__, vap->iv_ps_pending, timoff, timlen); 3381 } 3382 /* count down DTIM period */ 3383 if (tie->tim_count == 0) 3384 tie->tim_count = tie->tim_period - 1; 3385 else 3386 tie->tim_count--; 3387 /* update state for buffered multicast frames on DTIM */ 3388 if (mcast && tie->tim_count == 0) 3389 tie->tim_bitctl |= 1; 3390 else 3391 tie->tim_bitctl &= ~1; 3392 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3393 struct ieee80211_csa_ie *csa = 3394 (struct ieee80211_csa_ie *) bo->bo_csa; 3395 3396 /* 3397 * Insert or update CSA ie. If we're just starting 3398 * to count down to the channel switch then we need 3399 * to insert the CSA ie. Otherwise we just need to 3400 * drop the count. The actual change happens above 3401 * when the vap's count reaches the target count. 3402 */ 3403 if (vap->iv_csa_count == 0) { 3404 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3405 bo->bo_erp += sizeof(*csa); 3406 bo->bo_htinfo += sizeof(*csa); 3407 bo->bo_wme += sizeof(*csa); 3408 #ifdef IEEE80211_SUPPORT_SUPERG 3409 bo->bo_ath += sizeof(*csa); 3410 #endif 3411 #ifdef IEEE80211_SUPPORT_TDMA 3412 bo->bo_tdma += sizeof(*csa); 3413 #endif 3414 #ifdef IEEE80211_SUPPORT_MESH 3415 bo->bo_meshconf += sizeof(*csa); 3416 #endif 3417 bo->bo_appie += sizeof(*csa); 3418 bo->bo_csa_trailer_len += sizeof(*csa); 3419 bo->bo_quiet += sizeof(*csa); 3420 bo->bo_tim_trailer_len += sizeof(*csa); 3421 m->m_len += sizeof(*csa); 3422 m->m_pkthdr.len += sizeof(*csa); 3423 3424 ieee80211_add_csa(bo->bo_csa, vap); 3425 } else 3426 csa->csa_count--; 3427 vap->iv_csa_count++; 3428 /* NB: don't clear IEEE80211_BEACON_CSA */ 3429 } 3430 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3431 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3432 if (vap->iv_quiet) 3433 ieee80211_add_quiet(bo->bo_quiet, vap); 3434 } 3435 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3436 /* 3437 * ERP element needs updating. 3438 */ 3439 (void) ieee80211_add_erp(bo->bo_erp, ic); 3440 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3441 } 3442 #ifdef IEEE80211_SUPPORT_SUPERG 3443 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3444 ieee80211_add_athcaps(bo->bo_ath, ni); 3445 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3446 } 3447 #endif 3448 } 3449 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3450 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3451 int aielen; 3452 uint8_t *frm; 3453 3454 aielen = 0; 3455 if (aie != NULL) 3456 aielen += aie->ie_len; 3457 if (aielen != bo->bo_appie_len) { 3458 /* copy up/down trailer */ 3459 int adjust = aielen - bo->bo_appie_len; 3460 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3461 bo->bo_tim_trailer_len); 3462 bo->bo_tim_trailer += adjust; 3463 bo->bo_appie += adjust; 3464 bo->bo_appie_len = aielen; 3465 3466 len_changed = 1; 3467 } 3468 frm = bo->bo_appie; 3469 if (aie != NULL) 3470 frm = add_appie(frm, aie); 3471 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3472 } 3473 IEEE80211_UNLOCK(ic); 3474 3475 return len_changed; 3476 } 3477 3478 /* 3479 * Do Ethernet-LLC encapsulation for each payload in a fast frame 3480 * tunnel encapsulation. The frame is assumed to have an Ethernet 3481 * header at the front that must be stripped before prepending the 3482 * LLC followed by the Ethernet header passed in (with an Ethernet 3483 * type that specifies the payload size). 3484 */ 3485 struct mbuf * 3486 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 3487 const struct ether_header *eh) 3488 { 3489 struct llc *llc; 3490 uint16_t payload; 3491 3492 /* XXX optimize by combining m_adj+M_PREPEND */ 3493 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 3494 llc = mtod(m, struct llc *); 3495 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 3496 llc->llc_control = LLC_UI; 3497 llc->llc_snap.org_code[0] = 0; 3498 llc->llc_snap.org_code[1] = 0; 3499 llc->llc_snap.org_code[2] = 0; 3500 llc->llc_snap.ether_type = eh->ether_type; 3501 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 3502 3503 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 3504 if (m == NULL) { /* XXX cannot happen */ 3505 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 3506 "%s: no space for ether_header\n", __func__); 3507 vap->iv_stats.is_tx_nobuf++; 3508 return NULL; 3509 } 3510 ETHER_HEADER_COPY(mtod(m, void *), eh); 3511 mtod(m, struct ether_header *)->ether_type = htons(payload); 3512 return m; 3513 } 3514 3515 /* 3516 * Complete an mbuf transmission. 3517 * 3518 * For now, this simply processes a completed frame after the 3519 * driver has completed it's transmission and/or retransmission. 3520 * It assumes the frame is an 802.11 encapsulated frame. 3521 * 3522 * Later on it will grow to become the exit path for a given frame 3523 * from the driver and, depending upon how it's been encapsulated 3524 * and already transmitted, it may end up doing A-MPDU retransmission, 3525 * power save requeuing, etc. 3526 * 3527 * In order for the above to work, the driver entry point to this 3528 * must not hold any driver locks. Thus, the driver needs to delay 3529 * any actual mbuf completion until it can release said locks. 3530 * 3531 * This frees the mbuf and if the mbuf has a node reference, 3532 * the node reference will be freed. 3533 */ 3534 void 3535 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status) 3536 { 3537 3538 if (ni != NULL) { 3539 if (m->m_flags & M_TXCB) 3540 ieee80211_process_callback(ni, m, status); 3541 ieee80211_free_node(ni); 3542 } 3543 m_freem(m); 3544 } 3545