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