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/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/endian.h> 40 41 #include <sys/socket.h> 42 43 #include <net/bpf.h> 44 #include <net/ethernet.h> 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/if_llc.h> 48 #include <net/if_media.h> 49 #include <net/vlan/if_vlan_var.h> 50 51 #if defined(__DragonFly__) 52 #include <net/ifq_var.h> 53 #endif 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_regdomain.h> 57 #ifdef IEEE80211_SUPPORT_SUPERG 58 #include <netproto/802_11/ieee80211_superg.h> 59 #endif 60 #ifdef IEEE80211_SUPPORT_TDMA 61 #include <netproto/802_11/ieee80211_tdma.h> 62 #endif 63 #include <netproto/802_11/ieee80211_wds.h> 64 #include <netproto/802_11/ieee80211_mesh.h> 65 66 #if defined(INET) || defined(INET6) 67 #include <netinet/in.h> 68 #endif 69 70 #ifdef INET 71 #include <netinet/if_ether.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #endif 75 #ifdef INET6 76 #include <netinet/ip6.h> 77 #endif 78 79 #if defined(__DragonFly__) 80 #else 81 #include <security/mac/mac_framework.h> 82 #endif 83 84 #define ETHER_HEADER_COPY(dst, src) \ 85 memcpy(dst, src, sizeof(struct ether_header)) 86 87 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 88 u_int hdrsize, u_int ciphdrsize, u_int mtu); 89 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 90 91 #ifdef IEEE80211_DEBUG 92 /* 93 * Decide if an outbound management frame should be 94 * printed when debugging is enabled. This filters some 95 * of the less interesting frames that come frequently 96 * (e.g. beacons). 97 */ 98 static __inline int 99 doprint(struct ieee80211vap *vap, int subtype) 100 { 101 switch (subtype) { 102 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 103 return (vap->iv_opmode == IEEE80211_M_IBSS); 104 } 105 return 1; 106 } 107 #endif 108 109 /* 110 * Transmit a frame to the given destination on the given VAP. 111 * 112 * It's up to the caller to figure out the details of who this 113 * is going to and resolving the node. 114 * 115 * This routine takes care of queuing it for power save, 116 * A-MPDU state stuff, fast-frames state stuff, encapsulation 117 * if required, then passing it up to the driver layer. 118 * 119 * This routine (for now) consumes the mbuf and frees the node 120 * reference; it ideally will return a TX status which reflects 121 * whether the mbuf was consumed or not, so the caller can 122 * free the mbuf (if appropriate) and the node reference (again, 123 * if appropriate.) 124 */ 125 int 126 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m, 127 struct ieee80211_node *ni) 128 { 129 struct ieee80211com *ic = vap->iv_ic; 130 struct ifnet *ifp = vap->iv_ifp; 131 int len, mcast; 132 133 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 134 (m->m_flags & M_PWR_SAV) == 0) { 135 /* 136 * Station in power save mode; pass the frame 137 * to the 802.11 layer and continue. We'll get 138 * the frame back when the time is right. 139 * XXX lose WDS vap linkage? 140 */ 141 if (ieee80211_pwrsave(ni, m) != 0) 142 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 143 ieee80211_free_node(ni); 144 145 /* 146 * We queued it fine, so tell the upper layer 147 * that we consumed it. 148 */ 149 return (0); 150 } 151 /* calculate priority so drivers can find the tx queue */ 152 if (ieee80211_classify(ni, m)) { 153 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 154 ni->ni_macaddr, NULL, 155 "%s", "classification failure"); 156 vap->iv_stats.is_tx_classify++; 157 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 158 m_freem(m); 159 ieee80211_free_node(ni); 160 161 /* XXX better status? */ 162 return (0); 163 } 164 /* 165 * Stash the node pointer. Note that we do this after 166 * any call to ieee80211_dwds_mcast because that code 167 * uses any existing value for rcvif to identify the 168 * interface it (might have been) received on. 169 */ 170 m->m_pkthdr.rcvif = (void *)ni; 171 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0; 172 len = m->m_pkthdr.len; 173 174 BPF_MTAP(ifp, m); /* 802.3 tx */ 175 176 /* 177 * Check if A-MPDU tx aggregation is setup or if we 178 * should try to enable it. The sta must be associated 179 * with HT and A-MPDU enabled for use. When the policy 180 * routine decides we should enable A-MPDU we issue an 181 * ADDBA request and wait for a reply. The frame being 182 * encapsulated will go out w/o using A-MPDU, or possibly 183 * it might be collected by the driver and held/retransmit. 184 * The default ic_ampdu_enable routine handles staggering 185 * ADDBA requests in case the receiver NAK's us or we are 186 * otherwise unable to establish a BA stream. 187 */ 188 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 189 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX)) { 190 if ((m->m_flags & M_EAPOL) == 0) { 191 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 192 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 193 194 ieee80211_txampdu_count_packet(tap); 195 if (IEEE80211_AMPDU_RUNNING(tap)) { 196 /* 197 * Operational, mark frame for aggregation. 198 * 199 * XXX do tx aggregation here 200 */ 201 m->m_flags |= M_AMPDU_MPDU; 202 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 203 ic->ic_ampdu_enable(ni, tap)) { 204 /* 205 * Not negotiated yet, request service. 206 */ 207 ieee80211_ampdu_request(ni, tap); 208 /* XXX hold frame for reply? */ 209 } 210 } 211 } 212 213 #ifdef IEEE80211_SUPPORT_SUPERG 214 /* 215 * Check for AMSDU/FF; queue for aggregation 216 * 217 * Note: we don't bother trying to do fast frames or 218 * A-MSDU encapsulation for 802.3 drivers. Now, we 219 * likely could do it for FF (because it's a magic 220 * atheros tunnel LLC type) but I don't think we're going 221 * to really need to. For A-MSDU we'd have to set the 222 * A-MSDU QoS bit in the wifi header, so we just plain 223 * can't do it. 224 * 225 * Strictly speaking, we could actually /do/ A-MSDU / FF 226 * with A-MPDU together which for certain circumstances 227 * is beneficial (eg A-MSDU of TCK ACKs.) However, 228 * I'll ignore that for now so existing behaviour is maintained. 229 * Later on it would be good to make "amsdu + ampdu" configurable. 230 */ 231 else if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 232 if ((! mcast) && ieee80211_amsdu_tx_ok(ni)) { 233 m = ieee80211_amsdu_check(ni, m); 234 if (m == NULL) { 235 /* NB: any ni ref held on stageq */ 236 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 237 "%s: amsdu_check queued frame\n", 238 __func__); 239 return (0); 240 } 241 } else if ((! mcast) && IEEE80211_ATH_CAP(vap, ni, 242 IEEE80211_NODE_FF)) { 243 m = ieee80211_ff_check(ni, m); 244 if (m == NULL) { 245 /* NB: any ni ref held on stageq */ 246 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 247 "%s: ff_check queued frame\n", 248 __func__); 249 return (0); 250 } 251 } 252 } 253 #endif /* IEEE80211_SUPPORT_SUPERG */ 254 255 /* 256 * Grab the TX lock - serialise the TX process from this 257 * point (where TX state is being checked/modified) 258 * through to driver queue. 259 */ 260 IEEE80211_TX_LOCK(ic); 261 262 /* 263 * XXX make the encap and transmit code a separate function 264 * so things like the FF (and later A-MSDU) path can just call 265 * it for flushed frames. 266 */ 267 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 268 /* 269 * Encapsulate the packet in prep for transmission. 270 */ 271 m = ieee80211_encap(vap, ni, m); 272 if (m == NULL) { 273 /* NB: stat+msg handled in ieee80211_encap */ 274 IEEE80211_TX_UNLOCK(ic); 275 ieee80211_free_node(ni); 276 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 277 return (ENOBUFS); 278 } 279 } 280 /* HACK - added by DragonFly, mbuf could lose rcvif assignment above */ 281 m->m_pkthdr.rcvif = (void *)ni; 282 (void) ieee80211_parent_xmitpkt(ic, m); 283 284 /* 285 * Unlock at this point - no need to hold it across 286 * ieee80211_free_node() (ie, the comlock) 287 */ 288 IEEE80211_TX_UNLOCK(ic); 289 ic->ic_lastdata = ticks; 290 291 return (0); 292 } 293 294 295 296 /* 297 * Send the given mbuf through the given vap. 298 * 299 * This consumes the mbuf regardless of whether the transmit 300 * was successful or not. 301 * 302 * This does none of the initial checks that ieee80211_start() 303 * does (eg CAC timeout, interface wakeup) - the caller must 304 * do this first. 305 */ 306 static int 307 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 308 { 309 #define IS_DWDS(vap) \ 310 (vap->iv_opmode == IEEE80211_M_WDS && \ 311 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 312 struct ieee80211com *ic = vap->iv_ic; 313 struct ifnet *ifp = vap->iv_ifp; 314 struct ieee80211_node *ni; 315 struct ether_header *eh; 316 317 /* 318 * Cancel any background scan. 319 */ 320 if (ic->ic_flags & IEEE80211_F_SCAN) 321 ieee80211_cancel_anyscan(vap); 322 /* 323 * Find the node for the destination so we can do 324 * things like power save and fast frames aggregation. 325 * 326 * NB: past this point various code assumes the first 327 * mbuf has the 802.3 header present (and contiguous). 328 */ 329 ni = NULL; 330 if (m->m_len < sizeof(struct ether_header) && 331 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 332 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 333 "discard frame, %s\n", "m_pullup failed"); 334 vap->iv_stats.is_tx_nobuf++; /* XXX */ 335 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 336 return (ENOBUFS); 337 } 338 eh = mtod(m, struct ether_header *); 339 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 340 if (IS_DWDS(vap)) { 341 /* 342 * Only unicast frames from the above go out 343 * DWDS vaps; multicast frames are handled by 344 * dispatching the frame as it comes through 345 * the AP vap (see below). 346 */ 347 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 348 eh->ether_dhost, "mcast", "%s", "on DWDS"); 349 vap->iv_stats.is_dwds_mcast++; 350 m_freem(m); 351 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 352 /* XXX better status? */ 353 return (ENOBUFS); 354 } 355 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 356 /* 357 * Spam DWDS vap's w/ multicast traffic. 358 */ 359 /* XXX only if dwds in use? */ 360 ieee80211_dwds_mcast(vap, m); 361 } 362 } 363 #ifdef IEEE80211_SUPPORT_MESH 364 if (vap->iv_opmode != IEEE80211_M_MBSS) { 365 #endif 366 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 367 if (ni == NULL) { 368 /* NB: ieee80211_find_txnode does stat+msg */ 369 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 370 m_freem(m); 371 /* XXX better status? */ 372 return (ENOBUFS); 373 } 374 if (ni->ni_associd == 0 && 375 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 376 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 377 eh->ether_dhost, NULL, 378 "sta not associated (type 0x%04x)", 379 htons(eh->ether_type)); 380 vap->iv_stats.is_tx_notassoc++; 381 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 382 m_freem(m); 383 ieee80211_free_node(ni); 384 /* XXX better status? */ 385 return (ENOBUFS); 386 } 387 #ifdef IEEE80211_SUPPORT_MESH 388 } else { 389 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 390 /* 391 * Proxy station only if configured. 392 */ 393 if (!ieee80211_mesh_isproxyena(vap)) { 394 IEEE80211_DISCARD_MAC(vap, 395 IEEE80211_MSG_OUTPUT | 396 IEEE80211_MSG_MESH, 397 eh->ether_dhost, NULL, 398 "%s", "proxy not enabled"); 399 vap->iv_stats.is_mesh_notproxy++; 400 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 401 m_freem(m); 402 /* XXX better status? */ 403 return (ENOBUFS); 404 } 405 #if defined(__DragonFly__) 406 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 407 "forward frame from DS SA(%s), DA(%s)\n", 408 ether_sprintf(eh->ether_shost), 409 ether_sprintf(eh->ether_dhost)); 410 #else 411 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 412 "forward frame from DS SA(%6D), DA(%6D)\n", 413 eh->ether_shost, ":", 414 eh->ether_dhost, ":"); 415 #endif 416 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 417 } 418 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 419 if (ni == NULL) { 420 /* 421 * NB: ieee80211_mesh_discover holds/disposes 422 * frame (e.g. queueing on path discovery). 423 */ 424 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 425 /* XXX better status? */ 426 return (ENOBUFS); 427 } 428 } 429 #endif 430 431 /* 432 * We've resolved the sender, so attempt to transmit it. 433 */ 434 435 if (vap->iv_state == IEEE80211_S_SLEEP) { 436 /* 437 * In power save; queue frame and then wakeup device 438 * for transmit. 439 */ 440 ic->ic_lastdata = ticks; 441 if (ieee80211_pwrsave(ni, m) != 0) 442 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 443 ieee80211_free_node(ni); 444 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 445 return (0); 446 } 447 448 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0) 449 return (ENOBUFS); 450 return (0); 451 #undef IS_DWDS 452 } 453 454 /* 455 * Start method for vap's. All packets from the stack come 456 * through here. We handle common processing of the packets 457 * before dispatching them to the underlying device. 458 * 459 * if_transmit() requires that the mbuf be consumed by this call 460 * regardless of the return condition. 461 */ 462 463 #if defined(__DragonFly__) 464 465 void 466 ieee80211_vap_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 467 { 468 struct ieee80211vap *vap = ifp->if_softc; 469 struct ieee80211com *ic = vap->iv_ic; 470 struct ifnet *parent = vap->iv_ifp; 471 struct mbuf *m = NULL; 472 473 /* NB: parent must be up and running */ 474 if (!IFNET_IS_UP_RUNNING(parent)) { 475 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 476 "%s: ignore queue, parent %s not up+running\n", 477 __func__, parent->if_xname); 478 /* XXX stat */ 479 /*m_freem(m);*/ 480 /*return (EINVAL);*/ 481 return; 482 } 483 484 wlan_assert_serialized(); 485 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 486 487 /* 488 * No data frames go out unless we're running. 489 * Note in particular this covers CAC and CSA 490 * states (though maybe we should check muting 491 * for CSA). 492 */ 493 if (vap->iv_state != IEEE80211_S_RUN && 494 vap->iv_state != IEEE80211_S_SLEEP) { 495 IEEE80211_LOCK(ic); 496 /* re-check under the com lock to avoid races */ 497 if (vap->iv_state != IEEE80211_S_RUN && 498 vap->iv_state != IEEE80211_S_SLEEP) { 499 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 500 "%s: ignore queue, in %s state\n", 501 __func__, ieee80211_state_name[vap->iv_state]); 502 vap->iv_stats.is_tx_badstate++; 503 IEEE80211_UNLOCK(ic); 504 ifsq_set_oactive(ifsq); 505 /*m_freem(m);*/ 506 /* return (EINVAL); */ 507 return; 508 } 509 IEEE80211_UNLOCK(ic); 510 } 511 512 wlan_serialize_exit(); 513 for (;;) { 514 m = ifsq_dequeue(ifsq); 515 if (m == NULL) 516 break; 517 518 /* 519 * Sanitize mbuf flags for net80211 use. We cannot 520 * clear M_PWR_SAV or M_MORE_DATA because these may 521 * be set for frames that are re-submitted from the 522 * power save queue. 523 * 524 * NB: This must be done before ieee80211_classify as 525 * it marks EAPOL in frames with M_EAPOL. 526 */ 527 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 528 529 /* 530 * Bump to the packet transmission path. 531 * The mbuf will be consumed here. 532 */ 533 ieee80211_start_pkt(vap, m); 534 } 535 wlan_serialize_enter(); 536 } 537 538 #else 539 540 int 541 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m) 542 { 543 struct ieee80211vap *vap = ifp->if_softc; 544 struct ieee80211com *ic = vap->iv_ic; 545 546 /* 547 * No data frames go out unless we're running. 548 * Note in particular this covers CAC and CSA 549 * states (though maybe we should check muting 550 * for CSA). 551 */ 552 if (vap->iv_state != IEEE80211_S_RUN && 553 vap->iv_state != IEEE80211_S_SLEEP) { 554 IEEE80211_LOCK(ic); 555 /* re-check under the com lock to avoid races */ 556 if (vap->iv_state != IEEE80211_S_RUN && 557 vap->iv_state != IEEE80211_S_SLEEP) { 558 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 559 "%s: ignore queue, in %s state\n", 560 __func__, ieee80211_state_name[vap->iv_state]); 561 vap->iv_stats.is_tx_badstate++; 562 IEEE80211_UNLOCK(ic); 563 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 564 m_freem(m); 565 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 566 return (ENETDOWN); 567 } 568 IEEE80211_UNLOCK(ic); 569 } 570 571 /* 572 * Sanitize mbuf flags for net80211 use. We cannot 573 * clear M_PWR_SAV or M_MORE_DATA because these may 574 * be set for frames that are re-submitted from the 575 * power save queue. 576 * 577 * NB: This must be done before ieee80211_classify as 578 * it marks EAPOL in frames with M_EAPOL. 579 */ 580 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 581 582 /* 583 * Bump to the packet transmission path. 584 * The mbuf will be consumed here. 585 */ 586 return (ieee80211_start_pkt(vap, m)); 587 } 588 589 void 590 ieee80211_vap_qflush(struct ifnet *ifp) 591 { 592 593 /* Empty for now */ 594 } 595 596 #endif 597 598 /* 599 * 802.11 raw output routine. 600 * 601 * XXX TODO: this (and other send routines) should correctly 602 * XXX keep the pwr mgmt bit set if it decides to call into the 603 * XXX driver to send a frame whilst the state is SLEEP. 604 * 605 * Otherwise the peer may decide that we're awake and flood us 606 * with traffic we are still too asleep to receive! 607 */ 608 int 609 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 610 struct mbuf *m, const struct ieee80211_bpf_params *params) 611 { 612 struct ieee80211com *ic = vap->iv_ic; 613 int error; 614 615 /* 616 * Set node - the caller has taken a reference, so ensure 617 * that the mbuf has the same node value that 618 * it would if it were going via the normal path. 619 */ 620 m->m_pkthdr.rcvif = (void *)ni; 621 622 /* 623 * Attempt to add bpf transmit parameters. 624 * 625 * For now it's ok to fail; the raw_xmit api still takes 626 * them as an option. 627 * 628 * Later on when ic_raw_xmit() has params removed, 629 * they'll have to be added - so fail the transmit if 630 * they can't be. 631 */ 632 if (params) 633 (void) ieee80211_add_xmit_params(m, params); 634 635 error = ic->ic_raw_xmit(ni, m, params); 636 if (error) { 637 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1); 638 ieee80211_free_node(ni); 639 } 640 return (error); 641 } 642 643 /* 644 * 802.11 output routine. This is (currently) used only to 645 * connect bpf write calls to the 802.11 layer for injecting 646 * raw 802.11 frames. 647 */ 648 #if defined(__DragonFly__) 649 int 650 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 651 struct sockaddr *dst, struct rtentry *rt) 652 #else 653 int 654 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 655 const struct sockaddr *dst, struct route *ro) 656 #endif 657 { 658 #define senderr(e) do { error = (e); goto bad;} while (0) 659 struct ieee80211_node *ni = NULL; 660 struct ieee80211vap *vap; 661 struct ieee80211_frame *wh; 662 struct ieee80211com *ic = NULL; 663 int error; 664 int ret; 665 666 #if defined(__DragonFly__) 667 struct ifaltq_subque *ifsq; 668 ifsq = ifq_get_subq_default(&ifp->if_snd); 669 if (ifsq_is_oactive(ifsq)) { 670 #else 671 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 672 #endif 673 /* 674 * Short-circuit requests if the vap is marked OACTIVE 675 * as this can happen because a packet came down through 676 * ieee80211_start before the vap entered RUN state in 677 * which case it's ok to just drop the frame. This 678 * should not be necessary but callers of if_output don't 679 * check OACTIVE. 680 */ 681 senderr(ENETDOWN); 682 } 683 vap = ifp->if_softc; 684 ic = vap->iv_ic; 685 /* 686 * Hand to the 802.3 code if not tagged as 687 * a raw 802.11 frame. 688 */ 689 #if defined(__DragonFly__) 690 if (dst->sa_family != AF_IEEE80211) 691 return vap->iv_output(ifp, m, dst, rt); 692 #else 693 if (dst->sa_family != AF_IEEE80211) 694 return vap->iv_output(ifp, m, dst, ro); 695 #endif 696 #ifdef MAC 697 error = mac_ifnet_check_transmit(ifp, m); 698 if (error) 699 senderr(error); 700 #endif 701 if (ifp->if_flags & IFF_MONITOR) 702 senderr(ENETDOWN); 703 if (!IFNET_IS_UP_RUNNING(ifp)) 704 senderr(ENETDOWN); 705 if (vap->iv_state == IEEE80211_S_CAC) { 706 IEEE80211_DPRINTF(vap, 707 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 708 "block %s frame in CAC state\n", "raw data"); 709 vap->iv_stats.is_tx_badstate++; 710 senderr(EIO); /* XXX */ 711 } else if (vap->iv_state == IEEE80211_S_SCAN) 712 senderr(EIO); 713 /* XXX bypass bridge, pfil, carp, etc. */ 714 715 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 716 senderr(EIO); /* XXX */ 717 wh = mtod(m, struct ieee80211_frame *); 718 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 719 IEEE80211_FC0_VERSION_0) 720 senderr(EIO); /* XXX */ 721 722 /* locate destination node */ 723 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 724 case IEEE80211_FC1_DIR_NODS: 725 case IEEE80211_FC1_DIR_FROMDS: 726 ni = ieee80211_find_txnode(vap, wh->i_addr1); 727 break; 728 case IEEE80211_FC1_DIR_TODS: 729 case IEEE80211_FC1_DIR_DSTODS: 730 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 731 senderr(EIO); /* XXX */ 732 ni = ieee80211_find_txnode(vap, wh->i_addr3); 733 break; 734 default: 735 senderr(EIO); /* XXX */ 736 } 737 if (ni == NULL) { 738 /* 739 * Permit packets w/ bpf params through regardless 740 * (see below about sa_len). 741 */ 742 if (dst->sa_len == 0) 743 senderr(EHOSTUNREACH); 744 ni = ieee80211_ref_node(vap->iv_bss); 745 } 746 747 /* 748 * Sanitize mbuf for net80211 flags leaked from above. 749 * 750 * NB: This must be done before ieee80211_classify as 751 * it marks EAPOL in frames with M_EAPOL. 752 */ 753 m->m_flags &= ~M_80211_TX; 754 755 /* calculate priority so drivers can find the tx queue */ 756 /* XXX assumes an 802.3 frame */ 757 if (ieee80211_classify(ni, m)) 758 senderr(EIO); /* XXX */ 759 760 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 761 IEEE80211_NODE_STAT(ni, tx_data); 762 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 763 IEEE80211_NODE_STAT(ni, tx_mcast); 764 m->m_flags |= M_MCAST; 765 } else 766 IEEE80211_NODE_STAT(ni, tx_ucast); 767 /* NB: ieee80211_encap does not include 802.11 header */ 768 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 769 770 IEEE80211_TX_LOCK(ic); 771 772 /* 773 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 774 * present by setting the sa_len field of the sockaddr (yes, 775 * this is a hack). 776 * NB: we assume sa_data is suitably aligned to cast. 777 */ 778 ret = ieee80211_raw_output(vap, ni, m, 779 (const struct ieee80211_bpf_params *)(dst->sa_len ? 780 dst->sa_data : NULL)); 781 IEEE80211_TX_UNLOCK(ic); 782 return (ret); 783 bad: 784 if (m != NULL) 785 m_freem(m); 786 if (ni != NULL) 787 ieee80211_free_node(ni); 788 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 789 return error; 790 #undef senderr 791 } 792 793 /* 794 * Set the direction field and address fields of an outgoing 795 * frame. Note this should be called early on in constructing 796 * a frame as it sets i_fc[1]; other bits can then be or'd in. 797 */ 798 void 799 ieee80211_send_setup( 800 struct ieee80211_node *ni, 801 struct mbuf *m, 802 int type, int tid, 803 const uint8_t sa[IEEE80211_ADDR_LEN], 804 const uint8_t da[IEEE80211_ADDR_LEN], 805 const uint8_t bssid[IEEE80211_ADDR_LEN]) 806 { 807 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 808 struct ieee80211vap *vap = ni->ni_vap; 809 struct ieee80211_tx_ampdu *tap; 810 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 811 ieee80211_seq seqno; 812 813 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic); 814 815 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 816 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 817 switch (vap->iv_opmode) { 818 case IEEE80211_M_STA: 819 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 820 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 821 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 822 IEEE80211_ADDR_COPY(wh->i_addr3, da); 823 break; 824 case IEEE80211_M_IBSS: 825 case IEEE80211_M_AHDEMO: 826 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 827 IEEE80211_ADDR_COPY(wh->i_addr1, da); 828 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 829 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 830 break; 831 case IEEE80211_M_HOSTAP: 832 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 833 IEEE80211_ADDR_COPY(wh->i_addr1, da); 834 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 835 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 836 break; 837 case IEEE80211_M_WDS: 838 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 839 IEEE80211_ADDR_COPY(wh->i_addr1, da); 840 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 841 IEEE80211_ADDR_COPY(wh->i_addr3, da); 842 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 843 break; 844 case IEEE80211_M_MBSS: 845 #ifdef IEEE80211_SUPPORT_MESH 846 if (IEEE80211_IS_MULTICAST(da)) { 847 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 848 /* XXX next hop */ 849 IEEE80211_ADDR_COPY(wh->i_addr1, da); 850 IEEE80211_ADDR_COPY(wh->i_addr2, 851 vap->iv_myaddr); 852 } else { 853 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 854 IEEE80211_ADDR_COPY(wh->i_addr1, da); 855 IEEE80211_ADDR_COPY(wh->i_addr2, 856 vap->iv_myaddr); 857 IEEE80211_ADDR_COPY(wh->i_addr3, da); 858 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 859 } 860 #endif 861 break; 862 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 863 break; 864 } 865 } else { 866 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 867 IEEE80211_ADDR_COPY(wh->i_addr1, da); 868 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 869 #ifdef IEEE80211_SUPPORT_MESH 870 if (vap->iv_opmode == IEEE80211_M_MBSS) 871 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 872 else 873 #endif 874 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 875 } 876 *(uint16_t *)&wh->i_dur[0] = 0; 877 878 tap = &ni->ni_tx_ampdu[tid]; 879 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 880 m->m_flags |= M_AMPDU_MPDU; 881 else { 882 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK, 883 type & IEEE80211_FC0_SUBTYPE_MASK)) 884 seqno = ni->ni_txseqs[tid]++; 885 else 886 seqno = 0; 887 888 *(uint16_t *)&wh->i_seq[0] = 889 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 890 M_SEQNO_SET(m, seqno); 891 } 892 893 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 894 m->m_flags |= M_MCAST; 895 #undef WH4 896 } 897 898 /* 899 * Send a management frame to the specified node. The node pointer 900 * must have a reference as the pointer will be passed to the driver 901 * and potentially held for a long time. If the frame is successfully 902 * dispatched to the driver, then it is responsible forkfreeing the 903 * reference (and potentiallykfree'ing up any associated storage); 904 * otherwise deal with reclaiming any reference (on error). 905 */ 906 int 907 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 908 struct ieee80211_bpf_params *params) 909 { 910 struct ieee80211vap *vap = ni->ni_vap; 911 struct ieee80211com *ic = ni->ni_ic; 912 struct ieee80211_frame *wh; 913 int ret; 914 915 KASSERT(ni != NULL, ("null node")); 916 917 if (vap->iv_state == IEEE80211_S_CAC) { 918 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 919 ni, "block %s frame in CAC state", 920 ieee80211_mgt_subtype_name(type)); 921 vap->iv_stats.is_tx_badstate++; 922 ieee80211_free_node(ni); 923 m_freem(m); 924 return EIO; /* XXX */ 925 } 926 927 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 928 if (m == NULL) { 929 ieee80211_free_node(ni); 930 return ENOMEM; 931 } 932 933 IEEE80211_TX_LOCK(ic); 934 935 wh = mtod(m, struct ieee80211_frame *); 936 ieee80211_send_setup(ni, m, 937 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 938 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 939 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 940 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 941 "encrypting frame (%s)", __func__); 942 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 943 } 944 m->m_flags |= M_ENCAP; /* mark encapsulated */ 945 946 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 947 M_WME_SETAC(m, params->ibp_pri); 948 949 #ifdef IEEE80211_DEBUG 950 /* avoid printing too many frames */ 951 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 952 ieee80211_msg_dumppkts(vap)) { 953 kprintf("[%s] send %s on channel %u\n", 954 ether_sprintf(wh->i_addr1), 955 ieee80211_mgt_subtype_name(type), 956 ieee80211_chan2ieee(ic, ic->ic_curchan)); 957 } 958 #endif 959 IEEE80211_NODE_STAT(ni, tx_mgmt); 960 961 ret = ieee80211_raw_output(vap, ni, m, params); 962 IEEE80211_TX_UNLOCK(ic); 963 return (ret); 964 } 965 966 static void 967 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg, 968 int status) 969 { 970 struct ieee80211vap *vap = ni->ni_vap; 971 972 wakeup(vap); 973 } 974 975 /* 976 * Send a null data frame to the specified node. If the station 977 * is setup for QoS then a QoS Null Data frame is constructed. 978 * If this is a WDS station then a 4-address frame is constructed. 979 * 980 * NB: the caller is assumed to have setup a node reference 981 * for use; this is necessary to deal with a race condition 982 * when probing for inactive stations. Like ieee80211_mgmt_output 983 * we must cleanup any node reference on error; however we 984 * can safely just unref it as we know it will never be the 985 * last reference to the node. 986 */ 987 int 988 ieee80211_send_nulldata(struct ieee80211_node *ni) 989 { 990 struct ieee80211vap *vap = ni->ni_vap; 991 struct ieee80211com *ic = ni->ni_ic; 992 struct mbuf *m; 993 struct ieee80211_frame *wh; 994 int hdrlen; 995 uint8_t *frm; 996 int ret; 997 998 if (vap->iv_state == IEEE80211_S_CAC) { 999 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 1000 ni, "block %s frame in CAC state", "null data"); 1001 ieee80211_unref_node(&ni); 1002 vap->iv_stats.is_tx_badstate++; 1003 return EIO; /* XXX */ 1004 } 1005 1006 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 1007 hdrlen = sizeof(struct ieee80211_qosframe); 1008 else 1009 hdrlen = sizeof(struct ieee80211_frame); 1010 /* NB: only WDS vap's get 4-address frames */ 1011 if (vap->iv_opmode == IEEE80211_M_WDS) 1012 hdrlen += IEEE80211_ADDR_LEN; 1013 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1014 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 1015 1016 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 1017 if (m == NULL) { 1018 /* XXX debug msg */ 1019 ieee80211_unref_node(&ni); 1020 vap->iv_stats.is_tx_nobuf++; 1021 return ENOMEM; 1022 } 1023 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 1024 ("leading space %zd", M_LEADINGSPACE(m))); 1025 M_PREPEND(m, hdrlen, M_NOWAIT); 1026 if (m == NULL) { 1027 /* NB: cannot happen */ 1028 ieee80211_free_node(ni); 1029 return ENOMEM; 1030 } 1031 1032 IEEE80211_TX_LOCK(ic); 1033 1034 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 1035 if (ni->ni_flags & IEEE80211_NODE_QOS) { 1036 const int tid = WME_AC_TO_TID(WME_AC_BE); 1037 uint8_t *qos; 1038 1039 ieee80211_send_setup(ni, m, 1040 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 1041 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 1042 1043 if (vap->iv_opmode == IEEE80211_M_WDS) 1044 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1045 else 1046 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1047 qos[0] = tid & IEEE80211_QOS_TID; 1048 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 1049 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1050 qos[1] = 0; 1051 } else { 1052 ieee80211_send_setup(ni, m, 1053 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 1054 IEEE80211_NONQOS_TID, 1055 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 1056 } 1057 if (vap->iv_opmode != IEEE80211_M_WDS) { 1058 /* NB: power management bit is never sent by an AP */ 1059 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 1060 vap->iv_opmode != IEEE80211_M_HOSTAP) 1061 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 1062 } 1063 if ((ic->ic_flags & IEEE80211_F_SCAN) && 1064 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) { 1065 ieee80211_add_callback(m, ieee80211_nulldata_transmitted, 1066 NULL); 1067 } 1068 m->m_len = m->m_pkthdr.len = hdrlen; 1069 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1070 1071 M_WME_SETAC(m, WME_AC_BE); 1072 1073 IEEE80211_NODE_STAT(ni, tx_data); 1074 1075 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 1076 "send %snull data frame on channel %u, pwr mgt %s", 1077 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 1078 ieee80211_chan2ieee(ic, ic->ic_curchan), 1079 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 1080 1081 ret = ieee80211_raw_output(vap, ni, m, NULL); 1082 IEEE80211_TX_UNLOCK(ic); 1083 return (ret); 1084 } 1085 1086 /* 1087 * Assign priority to a frame based on any vlan tag assigned 1088 * to the station and/or any Diffserv setting in an IP header. 1089 * Finally, if an ACM policy is setup (in station mode) it's 1090 * applied. 1091 */ 1092 int 1093 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 1094 { 1095 const struct ether_header *eh = mtod(m, struct ether_header *); 1096 int v_wme_ac, d_wme_ac, ac; 1097 1098 /* 1099 * Always promote PAE/EAPOL frames to high priority. 1100 */ 1101 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 1102 /* NB: mark so others don't need to check header */ 1103 m->m_flags |= M_EAPOL; 1104 ac = WME_AC_VO; 1105 goto done; 1106 } 1107 /* 1108 * Non-qos traffic goes to BE. 1109 */ 1110 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 1111 ac = WME_AC_BE; 1112 goto done; 1113 } 1114 1115 /* 1116 * If node has a vlan tag then all traffic 1117 * to it must have a matching tag. 1118 */ 1119 v_wme_ac = 0; 1120 if (ni->ni_vlan != 0) { 1121 if ((m->m_flags & M_VLANTAG) == 0) { 1122 IEEE80211_NODE_STAT(ni, tx_novlantag); 1123 return 1; 1124 } 1125 #if defined(__DragonFly__) 1126 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 1127 EVL_VLANOFTAG(ni->ni_vlan)) { 1128 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1129 return 1; 1130 } 1131 #else 1132 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 1133 EVL_VLANOFTAG(ni->ni_vlan)) { 1134 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1135 return 1; 1136 } 1137 #endif 1138 /* map vlan priority to AC */ 1139 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 1140 } 1141 1142 /* XXX m_copydata may be too slow for fast path */ 1143 #ifdef INET 1144 if (eh->ether_type == htons(ETHERTYPE_IP)) { 1145 uint8_t tos; 1146 /* 1147 * IP frame, map the DSCP bits from the TOS field. 1148 */ 1149 /* NB: ip header may not be in first mbuf */ 1150 m_copydata(m, sizeof(struct ether_header) + 1151 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 1152 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1153 d_wme_ac = TID_TO_WME_AC(tos); 1154 } else { 1155 #endif /* INET */ 1156 #ifdef INET6 1157 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 1158 uint32_t flow; 1159 uint8_t tos; 1160 /* 1161 * IPv6 frame, map the DSCP bits from the traffic class field. 1162 */ 1163 m_copydata(m, sizeof(struct ether_header) + 1164 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 1165 (caddr_t) &flow); 1166 tos = (uint8_t)(ntohl(flow) >> 20); 1167 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1168 d_wme_ac = TID_TO_WME_AC(tos); 1169 } else { 1170 #endif /* INET6 */ 1171 d_wme_ac = WME_AC_BE; 1172 #ifdef INET6 1173 } 1174 #endif 1175 #ifdef INET 1176 } 1177 #endif 1178 /* 1179 * Use highest priority AC. 1180 */ 1181 if (v_wme_ac > d_wme_ac) 1182 ac = v_wme_ac; 1183 else 1184 ac = d_wme_ac; 1185 1186 /* 1187 * Apply ACM policy. 1188 */ 1189 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 1190 static const int acmap[4] = { 1191 WME_AC_BK, /* WME_AC_BE */ 1192 WME_AC_BK, /* WME_AC_BK */ 1193 WME_AC_BE, /* WME_AC_VI */ 1194 WME_AC_VI, /* WME_AC_VO */ 1195 }; 1196 struct ieee80211com *ic = ni->ni_ic; 1197 1198 while (ac != WME_AC_BK && 1199 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 1200 ac = acmap[ac]; 1201 } 1202 done: 1203 M_WME_SETAC(m, ac); 1204 return 0; 1205 } 1206 1207 /* 1208 * Insure there is sufficient contiguous space to encapsulate the 1209 * 802.11 data frame. If room isn't already there, arrange for it. 1210 * Drivers and cipher modules assume we have done the necessary work 1211 * and fail rudely if they don't find the space they need. 1212 */ 1213 struct mbuf * 1214 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 1215 struct ieee80211_key *key, struct mbuf *m) 1216 { 1217 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 1218 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 1219 1220 if (key != NULL) { 1221 /* XXX belongs in crypto code? */ 1222 needed_space += key->wk_cipher->ic_header; 1223 /* XXX frags */ 1224 /* 1225 * When crypto is being done in the host we must insure 1226 * the data are writable for the cipher routines; clone 1227 * a writable mbuf chain. 1228 * XXX handle SWMIC specially 1229 */ 1230 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 1231 m = m_unshare(m, M_NOWAIT); 1232 if (m == NULL) { 1233 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1234 "%s: cannot get writable mbuf\n", __func__); 1235 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1236 return NULL; 1237 } 1238 } 1239 } 1240 /* 1241 * We know we are called just before stripping an Ethernet 1242 * header and prepending an LLC header. This means we know 1243 * there will be 1244 * sizeof(struct ether_header) - sizeof(struct llc) 1245 * bytes recovered to which we need additional space for the 1246 * 802.11 header and any crypto header. 1247 */ 1248 /* XXX check trailing space and copy instead? */ 1249 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1250 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1251 if (n == NULL) { 1252 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1253 "%s: cannot expand storage\n", __func__); 1254 vap->iv_stats.is_tx_nobuf++; 1255 m_freem(m); 1256 return NULL; 1257 } 1258 #if defined(__DragonFly__) 1259 KASSERT(needed_space <= MHLEN, 1260 ("not enough room, need %u got %zd\n", needed_space, MHLEN)); 1261 #else 1262 KASSERT(needed_space <= MHLEN, 1263 ("not enough room, need %u got %d\n", needed_space, MHLEN)); 1264 #endif 1265 /* 1266 * Setup new mbuf to have leading space to prepend the 1267 * 802.11 header and any crypto header bits that are 1268 * required (the latter are added when the driver calls 1269 * back to ieee80211_crypto_encap to do crypto encapsulation). 1270 */ 1271 /* NB: must be first 'cuz it clobbers m_data */ 1272 m_move_pkthdr(n, m); 1273 n->m_len = 0; /* NB: m_gethdr does not set */ 1274 n->m_data += needed_space; 1275 /* 1276 * Pull up Ethernet header to create the expected layout. 1277 * We could use m_pullup but that's overkill (i.e. we don't 1278 * need the actual data) and it cannot fail so do it inline 1279 * for speed. 1280 */ 1281 /* NB: struct ether_header is known to be contiguous */ 1282 n->m_len += sizeof(struct ether_header); 1283 m->m_len -= sizeof(struct ether_header); 1284 m->m_data += sizeof(struct ether_header); 1285 /* 1286 * Replace the head of the chain. 1287 */ 1288 n->m_next = m; 1289 m = n; 1290 } 1291 return m; 1292 #undef TO_BE_RECLAIMED 1293 } 1294 1295 /* 1296 * Return the transmit key to use in sending a unicast frame. 1297 * If a unicast key is set we use that. When no unicast key is set 1298 * we fall back to the default transmit key. 1299 */ 1300 static __inline struct ieee80211_key * 1301 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1302 struct ieee80211_node *ni) 1303 { 1304 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1305 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1306 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1307 return NULL; 1308 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1309 } else { 1310 return &ni->ni_ucastkey; 1311 } 1312 } 1313 1314 /* 1315 * Return the transmit key to use in sending a multicast frame. 1316 * Multicast traffic always uses the group key which is installed as 1317 * the default tx key. 1318 */ 1319 static __inline struct ieee80211_key * 1320 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1321 struct ieee80211_node *ni) 1322 { 1323 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1324 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1325 return NULL; 1326 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1327 } 1328 1329 /* 1330 * Encapsulate an outbound data frame. The mbuf chain is updated. 1331 * If an error is encountered NULL is returned. The caller is required 1332 * to provide a node reference and pullup the ethernet header in the 1333 * first mbuf. 1334 * 1335 * NB: Packet is assumed to be processed by ieee80211_classify which 1336 * marked EAPOL frames w/ M_EAPOL. 1337 */ 1338 struct mbuf * 1339 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1340 struct mbuf *m) 1341 { 1342 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1343 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1344 struct ieee80211com *ic = ni->ni_ic; 1345 #ifdef IEEE80211_SUPPORT_MESH 1346 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1347 struct ieee80211_meshcntl_ae10 *mc; 1348 struct ieee80211_mesh_route *rt = NULL; 1349 int dir = -1; 1350 #endif 1351 struct ether_header eh; 1352 struct ieee80211_frame *wh; 1353 struct ieee80211_key *key; 1354 struct llc *llc; 1355 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1356 ieee80211_seq seqno; 1357 int meshhdrsize, meshae; 1358 uint8_t *qos; 1359 int is_amsdu = 0; 1360 1361 IEEE80211_TX_LOCK_ASSERT(ic); 1362 1363 /* 1364 * Copy existing Ethernet header to a safe place. The 1365 * rest of the code assumes it's ok to strip it when 1366 * reorganizing state for the final encapsulation. 1367 */ 1368 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1369 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1370 1371 /* 1372 * Insure space for additional headers. First identify 1373 * transmit key to use in calculating any buffer adjustments 1374 * required. This is also used below to do privacy 1375 * encapsulation work. Then calculate the 802.11 header 1376 * size and any padding required by the driver. 1377 * 1378 * Note key may be NULL if we fall back to the default 1379 * transmit key and that is not set. In that case the 1380 * buffer may not be expanded as needed by the cipher 1381 * routines, but they will/should discard it. 1382 */ 1383 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1384 if (vap->iv_opmode == IEEE80211_M_STA || 1385 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1386 (vap->iv_opmode == IEEE80211_M_WDS && 1387 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1388 key = ieee80211_crypto_getucastkey(vap, ni); 1389 else 1390 key = ieee80211_crypto_getmcastkey(vap, ni); 1391 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1392 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1393 eh.ether_dhost, 1394 "no default transmit key (%s) deftxkey %u", 1395 __func__, vap->iv_def_txkey); 1396 vap->iv_stats.is_tx_nodefkey++; 1397 goto bad; 1398 } 1399 } else 1400 key = NULL; 1401 /* 1402 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1403 * frames so suppress use. This may be an issue if other 1404 * ap's require all data frames to be QoS-encapsulated 1405 * once negotiated in which case we'll need to make this 1406 * configurable. 1407 * NB: mesh data frames are QoS. 1408 */ 1409 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1410 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1411 (m->m_flags & M_EAPOL) == 0; 1412 if (addqos) 1413 hdrsize = sizeof(struct ieee80211_qosframe); 1414 else 1415 hdrsize = sizeof(struct ieee80211_frame); 1416 #ifdef IEEE80211_SUPPORT_MESH 1417 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1418 /* 1419 * Mesh data frames are encapsulated according to the 1420 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1421 * o Group Addressed data (aka multicast) originating 1422 * at the local sta are sent w/ 3-address format and 1423 * address extension mode 00 1424 * o Individually Addressed data (aka unicast) originating 1425 * at the local sta are sent w/ 4-address format and 1426 * address extension mode 00 1427 * o Group Addressed data forwarded from a non-mesh sta are 1428 * sent w/ 3-address format and address extension mode 01 1429 * o Individually Address data from another sta are sent 1430 * w/ 4-address format and address extension mode 10 1431 */ 1432 is4addr = 0; /* NB: don't use, disable */ 1433 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1434 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1435 KASSERT(rt != NULL, ("route is NULL")); 1436 dir = IEEE80211_FC1_DIR_DSTODS; 1437 hdrsize += IEEE80211_ADDR_LEN; 1438 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1439 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1440 vap->iv_myaddr)) { 1441 IEEE80211_NOTE_MAC(vap, 1442 IEEE80211_MSG_MESH, 1443 eh.ether_dhost, 1444 "%s", "trying to send to ourself"); 1445 goto bad; 1446 } 1447 meshae = IEEE80211_MESH_AE_10; 1448 meshhdrsize = 1449 sizeof(struct ieee80211_meshcntl_ae10); 1450 } else { 1451 meshae = IEEE80211_MESH_AE_00; 1452 meshhdrsize = 1453 sizeof(struct ieee80211_meshcntl); 1454 } 1455 } else { 1456 dir = IEEE80211_FC1_DIR_FROMDS; 1457 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1458 /* proxy group */ 1459 meshae = IEEE80211_MESH_AE_01; 1460 meshhdrsize = 1461 sizeof(struct ieee80211_meshcntl_ae01); 1462 } else { 1463 /* group */ 1464 meshae = IEEE80211_MESH_AE_00; 1465 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1466 } 1467 } 1468 } else { 1469 #endif 1470 /* 1471 * 4-address frames need to be generated for: 1472 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1473 * o packets sent through a vap marked for relaying 1474 * (e.g. a station operating with dynamic WDS) 1475 */ 1476 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1477 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1478 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1479 if (is4addr) 1480 hdrsize += IEEE80211_ADDR_LEN; 1481 meshhdrsize = meshae = 0; 1482 #ifdef IEEE80211_SUPPORT_MESH 1483 } 1484 #endif 1485 /* 1486 * Honor driver DATAPAD requirement. 1487 */ 1488 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1489 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1490 else 1491 hdrspace = hdrsize; 1492 1493 if (__predict_true((m->m_flags & M_FF) == 0)) { 1494 /* 1495 * Normal frame. 1496 */ 1497 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1498 if (m == NULL) { 1499 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1500 goto bad; 1501 } 1502 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1503 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1504 llc = mtod(m, struct llc *); 1505 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1506 llc->llc_control = LLC_UI; 1507 llc->llc_snap.org_code[0] = 0; 1508 llc->llc_snap.org_code[1] = 0; 1509 llc->llc_snap.org_code[2] = 0; 1510 llc->llc_snap.ether_type = eh.ether_type; 1511 } else { 1512 #ifdef IEEE80211_SUPPORT_SUPERG 1513 /* 1514 * Aggregated frame. Check if it's for AMSDU or FF. 1515 * 1516 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented 1517 * anywhere for some reason. But, since 11n requires 1518 * AMSDU RX, we can just assume "11n" == "AMSDU". 1519 */ 1520 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__); 1521 if (ieee80211_amsdu_tx_ok(ni)) { 1522 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key); 1523 is_amsdu = 1; 1524 } else { 1525 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1526 } 1527 if (m == NULL) 1528 #endif 1529 goto bad; 1530 } 1531 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1532 1533 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1534 if (m == NULL) { 1535 vap->iv_stats.is_tx_nobuf++; 1536 goto bad; 1537 } 1538 wh = mtod(m, struct ieee80211_frame *); 1539 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1540 *(uint16_t *)wh->i_dur = 0; 1541 qos = NULL; /* NB: quiet compiler */ 1542 if (is4addr) { 1543 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1544 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1545 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1546 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1547 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1548 } else switch (vap->iv_opmode) { 1549 case IEEE80211_M_STA: 1550 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1551 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1552 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1553 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1554 break; 1555 case IEEE80211_M_IBSS: 1556 case IEEE80211_M_AHDEMO: 1557 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1558 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1559 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1560 /* 1561 * NB: always use the bssid from iv_bss as the 1562 * neighbor's may be stale after an ibss merge 1563 */ 1564 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1565 break; 1566 case IEEE80211_M_HOSTAP: 1567 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1568 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1569 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1570 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1571 break; 1572 #ifdef IEEE80211_SUPPORT_MESH 1573 case IEEE80211_M_MBSS: 1574 /* NB: offset by hdrspace to deal with DATAPAD */ 1575 mc = (struct ieee80211_meshcntl_ae10 *) 1576 (mtod(m, uint8_t *) + hdrspace); 1577 wh->i_fc[1] = dir; 1578 switch (meshae) { 1579 case IEEE80211_MESH_AE_00: /* no proxy */ 1580 mc->mc_flags = 0; 1581 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1582 IEEE80211_ADDR_COPY(wh->i_addr1, 1583 ni->ni_macaddr); 1584 IEEE80211_ADDR_COPY(wh->i_addr2, 1585 vap->iv_myaddr); 1586 IEEE80211_ADDR_COPY(wh->i_addr3, 1587 eh.ether_dhost); 1588 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1589 eh.ether_shost); 1590 qos =((struct ieee80211_qosframe_addr4 *) 1591 wh)->i_qos; 1592 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1593 /* mcast */ 1594 IEEE80211_ADDR_COPY(wh->i_addr1, 1595 eh.ether_dhost); 1596 IEEE80211_ADDR_COPY(wh->i_addr2, 1597 vap->iv_myaddr); 1598 IEEE80211_ADDR_COPY(wh->i_addr3, 1599 eh.ether_shost); 1600 qos = ((struct ieee80211_qosframe *) 1601 wh)->i_qos; 1602 } 1603 break; 1604 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1605 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1606 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1607 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1608 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1609 mc->mc_flags = 1; 1610 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1611 eh.ether_shost); 1612 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1613 break; 1614 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1615 KASSERT(rt != NULL, ("route is NULL")); 1616 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1617 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1618 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1619 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1620 mc->mc_flags = IEEE80211_MESH_AE_10; 1621 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1622 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1623 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1624 break; 1625 default: 1626 KASSERT(0, ("meshae %d", meshae)); 1627 break; 1628 } 1629 mc->mc_ttl = ms->ms_ttl; 1630 ms->ms_seq++; 1631 le32enc(mc->mc_seq, ms->ms_seq); 1632 break; 1633 #endif 1634 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1635 default: 1636 goto bad; 1637 } 1638 if (m->m_flags & M_MORE_DATA) 1639 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1640 if (addqos) { 1641 int ac, tid; 1642 1643 if (is4addr) { 1644 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1645 /* NB: mesh case handled earlier */ 1646 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1647 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1648 ac = M_WME_GETAC(m); 1649 /* map from access class/queue to 11e header priorty value */ 1650 tid = WME_AC_TO_TID(ac); 1651 qos[0] = tid & IEEE80211_QOS_TID; 1652 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1653 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1654 #ifdef IEEE80211_SUPPORT_MESH 1655 if (vap->iv_opmode == IEEE80211_M_MBSS) 1656 qos[1] = IEEE80211_QOS_MC; 1657 else 1658 #endif 1659 qos[1] = 0; 1660 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1661 1662 /* 1663 * If this is an A-MSDU then ensure we set the 1664 * relevant field. 1665 */ 1666 if (is_amsdu) 1667 qos[0] |= IEEE80211_QOS_AMSDU; 1668 1669 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1670 /* 1671 * NB: don't assign a sequence # to potential 1672 * aggregates; we expect this happens at the 1673 * point the frame comes off any aggregation q 1674 * as otherwise we may introduce holes in the 1675 * BA sequence space and/or make window accouting 1676 * more difficult. 1677 * 1678 * XXX may want to control this with a driver 1679 * capability; this may also change when we pull 1680 * aggregation up into net80211 1681 */ 1682 seqno = ni->ni_txseqs[tid]++; 1683 *(uint16_t *)wh->i_seq = 1684 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1685 M_SEQNO_SET(m, seqno); 1686 } 1687 } else { 1688 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1689 *(uint16_t *)wh->i_seq = 1690 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1691 M_SEQNO_SET(m, seqno); 1692 1693 /* 1694 * XXX TODO: we shouldn't allow EAPOL, etc that would 1695 * be forced to be non-QoS traffic to be A-MSDU encapsulated. 1696 */ 1697 if (is_amsdu) 1698 kprintf("%s: XXX ERROR: is_amsdu set; not QoS!\n", 1699 __func__); 1700 } 1701 1702 1703 /* check if xmit fragmentation is required */ 1704 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1705 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1706 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1707 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1708 if (key != NULL) { 1709 /* 1710 * IEEE 802.1X: send EAPOL frames always in the clear. 1711 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1712 */ 1713 if ((m->m_flags & M_EAPOL) == 0 || 1714 ((vap->iv_flags & IEEE80211_F_WPA) && 1715 (vap->iv_opmode == IEEE80211_M_STA ? 1716 !IEEE80211_KEY_UNDEFINED(key) : 1717 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1718 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 1719 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1720 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1721 eh.ether_dhost, 1722 "%s", "enmic failed, discard frame"); 1723 vap->iv_stats.is_crypto_enmicfail++; 1724 goto bad; 1725 } 1726 } 1727 } 1728 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1729 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1730 goto bad; 1731 1732 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1733 1734 IEEE80211_NODE_STAT(ni, tx_data); 1735 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1736 IEEE80211_NODE_STAT(ni, tx_mcast); 1737 m->m_flags |= M_MCAST; 1738 } else 1739 IEEE80211_NODE_STAT(ni, tx_ucast); 1740 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1741 1742 return m; 1743 bad: 1744 if (m != NULL) 1745 m_freem(m); 1746 return NULL; 1747 #undef WH4 1748 #undef MC01 1749 } 1750 1751 void 1752 ieee80211_free_mbuf(struct mbuf *m) 1753 { 1754 struct mbuf *next; 1755 1756 if (m == NULL) 1757 return; 1758 1759 do { 1760 next = m->m_nextpkt; 1761 m->m_nextpkt = NULL; 1762 m_freem(m); 1763 } while ((m = next) != NULL); 1764 } 1765 1766 /* 1767 * Fragment the frame according to the specified mtu. 1768 * The size of the 802.11 header (w/o padding) is provided 1769 * so we don't need to recalculate it. We create a new 1770 * mbuf for each fragment and chain it through m_nextpkt; 1771 * we might be able to optimize this by reusing the original 1772 * packet's mbufs but that is significantly more complicated. 1773 */ 1774 static int 1775 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1776 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1777 { 1778 struct ieee80211com *ic = vap->iv_ic; 1779 struct ieee80211_frame *wh, *whf; 1780 struct mbuf *m, *prev; 1781 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1782 u_int hdrspace; 1783 1784 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1785 KASSERT(m0->m_pkthdr.len > mtu, 1786 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1787 1788 /* 1789 * Honor driver DATAPAD requirement. 1790 */ 1791 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1792 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1793 else 1794 hdrspace = hdrsize; 1795 1796 wh = mtod(m0, struct ieee80211_frame *); 1797 /* NB: mark the first frag; it will be propagated below */ 1798 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1799 totalhdrsize = hdrspace + ciphdrsize; 1800 fragno = 1; 1801 off = mtu - ciphdrsize; 1802 remainder = m0->m_pkthdr.len - off; 1803 prev = m0; 1804 do { 1805 fragsize = totalhdrsize + remainder; 1806 if (fragsize > mtu) 1807 fragsize = mtu; 1808 /* XXX fragsize can be >2048! */ 1809 KASSERT(fragsize < MCLBYTES, 1810 ("fragment size %u too big!", fragsize)); 1811 if (fragsize > MHLEN) 1812 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1813 else 1814 m = m_gethdr(M_NOWAIT, MT_DATA); 1815 if (m == NULL) 1816 goto bad; 1817 /* leave room to prepend any cipher header */ 1818 m_align(m, fragsize - ciphdrsize); 1819 1820 /* 1821 * Form the header in the fragment. Note that since 1822 * we mark the first fragment with the MORE_FRAG bit 1823 * it automatically is propagated to each fragment; we 1824 * need only clear it on the last fragment (done below). 1825 * NB: frag 1+ dont have Mesh Control field present. 1826 */ 1827 whf = mtod(m, struct ieee80211_frame *); 1828 memcpy(whf, wh, hdrsize); 1829 #ifdef IEEE80211_SUPPORT_MESH 1830 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1831 if (IEEE80211_IS_DSTODS(wh)) 1832 ((struct ieee80211_qosframe_addr4 *) 1833 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1834 else 1835 ((struct ieee80211_qosframe *) 1836 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1837 } 1838 #endif 1839 *(uint16_t *)&whf->i_seq[0] |= htole16( 1840 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1841 IEEE80211_SEQ_FRAG_SHIFT); 1842 fragno++; 1843 1844 payload = fragsize - totalhdrsize; 1845 /* NB: destination is known to be contiguous */ 1846 1847 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace); 1848 m->m_len = hdrspace + payload; 1849 m->m_pkthdr.len = hdrspace + payload; 1850 m->m_flags |= M_FRAG; 1851 1852 /* chain up the fragment */ 1853 prev->m_nextpkt = m; 1854 prev = m; 1855 1856 /* deduct fragment just formed */ 1857 remainder -= payload; 1858 off += payload; 1859 } while (remainder != 0); 1860 1861 /* set the last fragment */ 1862 m->m_flags |= M_LASTFRAG; 1863 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1864 1865 /* strip first mbuf now that everything has been copied */ 1866 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1867 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1868 1869 vap->iv_stats.is_tx_fragframes++; 1870 vap->iv_stats.is_tx_frags += fragno-1; 1871 1872 return 1; 1873 bad: 1874 /* reclaim fragments but leave original frame for caller to free */ 1875 ieee80211_free_mbuf(m0->m_nextpkt); 1876 m0->m_nextpkt = NULL; 1877 return 0; 1878 } 1879 1880 /* 1881 * Add a supported rates element id to a frame. 1882 */ 1883 uint8_t * 1884 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1885 { 1886 int nrates; 1887 1888 *frm++ = IEEE80211_ELEMID_RATES; 1889 nrates = rs->rs_nrates; 1890 if (nrates > IEEE80211_RATE_SIZE) 1891 nrates = IEEE80211_RATE_SIZE; 1892 *frm++ = nrates; 1893 memcpy(frm, rs->rs_rates, nrates); 1894 return frm + nrates; 1895 } 1896 1897 /* 1898 * Add an extended supported rates element id to a frame. 1899 */ 1900 uint8_t * 1901 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1902 { 1903 /* 1904 * Add an extended supported rates element if operating in 11g mode. 1905 */ 1906 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1907 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1908 *frm++ = IEEE80211_ELEMID_XRATES; 1909 *frm++ = nrates; 1910 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1911 frm += nrates; 1912 } 1913 return frm; 1914 } 1915 1916 /* 1917 * Add an ssid element to a frame. 1918 */ 1919 uint8_t * 1920 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1921 { 1922 *frm++ = IEEE80211_ELEMID_SSID; 1923 *frm++ = len; 1924 memcpy(frm, ssid, len); 1925 return frm + len; 1926 } 1927 1928 /* 1929 * Add an erp element to a frame. 1930 */ 1931 static uint8_t * 1932 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1933 { 1934 uint8_t erp; 1935 1936 *frm++ = IEEE80211_ELEMID_ERP; 1937 *frm++ = 1; 1938 erp = 0; 1939 if (ic->ic_nonerpsta != 0) 1940 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1941 if (ic->ic_flags & IEEE80211_F_USEPROT) 1942 erp |= IEEE80211_ERP_USE_PROTECTION; 1943 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1944 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1945 *frm++ = erp; 1946 return frm; 1947 } 1948 1949 /* 1950 * Add a CFParams element to a frame. 1951 */ 1952 static uint8_t * 1953 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1954 { 1955 #define ADDSHORT(frm, v) do { \ 1956 le16enc(frm, v); \ 1957 frm += 2; \ 1958 } while (0) 1959 *frm++ = IEEE80211_ELEMID_CFPARMS; 1960 *frm++ = 6; 1961 *frm++ = 0; /* CFP count */ 1962 *frm++ = 2; /* CFP period */ 1963 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1964 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1965 return frm; 1966 #undef ADDSHORT 1967 } 1968 1969 static __inline uint8_t * 1970 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1971 { 1972 memcpy(frm, ie->ie_data, ie->ie_len); 1973 return frm + ie->ie_len; 1974 } 1975 1976 static __inline uint8_t * 1977 add_ie(uint8_t *frm, const uint8_t *ie) 1978 { 1979 memcpy(frm, ie, 2 + ie[1]); 1980 return frm + 2 + ie[1]; 1981 } 1982 1983 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1984 /* 1985 * Add a WME information element to a frame. 1986 */ 1987 uint8_t * 1988 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1989 { 1990 static const struct ieee80211_wme_info info = { 1991 .wme_id = IEEE80211_ELEMID_VENDOR, 1992 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1993 .wme_oui = { WME_OUI_BYTES }, 1994 .wme_type = WME_OUI_TYPE, 1995 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1996 .wme_version = WME_VERSION, 1997 .wme_info = 0, 1998 }; 1999 memcpy(frm, &info, sizeof(info)); 2000 return frm + sizeof(info); 2001 } 2002 2003 /* 2004 * Add a WME parameters element to a frame. 2005 */ 2006 static uint8_t * 2007 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 2008 { 2009 #define SM(_v, _f) (((_v) << _f##_S) & _f) 2010 #define ADDSHORT(frm, v) do { \ 2011 le16enc(frm, v); \ 2012 frm += 2; \ 2013 } while (0) 2014 /* NB: this works 'cuz a param has an info at the front */ 2015 static const struct ieee80211_wme_info param = { 2016 .wme_id = IEEE80211_ELEMID_VENDOR, 2017 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 2018 .wme_oui = { WME_OUI_BYTES }, 2019 .wme_type = WME_OUI_TYPE, 2020 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 2021 .wme_version = WME_VERSION, 2022 }; 2023 int i; 2024 2025 memcpy(frm, ¶m, sizeof(param)); 2026 frm += __offsetof(struct ieee80211_wme_info, wme_info); 2027 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 2028 *frm++ = 0; /* reserved field */ 2029 for (i = 0; i < WME_NUM_AC; i++) { 2030 const struct wmeParams *ac = 2031 &wme->wme_bssChanParams.cap_wmeParams[i]; 2032 *frm++ = SM(i, WME_PARAM_ACI) 2033 | SM(ac->wmep_acm, WME_PARAM_ACM) 2034 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 2035 ; 2036 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 2037 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 2038 ; 2039 ADDSHORT(frm, ac->wmep_txopLimit); 2040 } 2041 return frm; 2042 #undef SM 2043 #undef ADDSHORT 2044 } 2045 #undef WME_OUI_BYTES 2046 2047 /* 2048 * Add an 11h Power Constraint element to a frame. 2049 */ 2050 static uint8_t * 2051 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 2052 { 2053 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 2054 /* XXX per-vap tx power limit? */ 2055 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 2056 2057 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 2058 frm[1] = 1; 2059 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 2060 return frm + 3; 2061 } 2062 2063 /* 2064 * Add an 11h Power Capability element to a frame. 2065 */ 2066 static uint8_t * 2067 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 2068 { 2069 frm[0] = IEEE80211_ELEMID_PWRCAP; 2070 frm[1] = 2; 2071 frm[2] = c->ic_minpower; 2072 frm[3] = c->ic_maxpower; 2073 return frm + 4; 2074 } 2075 2076 /* 2077 * Add an 11h Supported Channels element to a frame. 2078 */ 2079 static uint8_t * 2080 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 2081 { 2082 static const int ielen = 26; 2083 2084 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 2085 frm[1] = ielen; 2086 /* XXX not correct */ 2087 memcpy(frm+2, ic->ic_chan_avail, ielen); 2088 return frm + 2 + ielen; 2089 } 2090 2091 /* 2092 * Add an 11h Quiet time element to a frame. 2093 */ 2094 static uint8_t * 2095 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 2096 { 2097 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 2098 2099 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 2100 quiet->len = 6; 2101 if (vap->iv_quiet_count_value == 1) 2102 vap->iv_quiet_count_value = vap->iv_quiet_count; 2103 else if (vap->iv_quiet_count_value > 1) 2104 vap->iv_quiet_count_value--; 2105 2106 if (vap->iv_quiet_count_value == 0) { 2107 /* value 0 is reserved as per 802.11h standerd */ 2108 vap->iv_quiet_count_value = 1; 2109 } 2110 2111 quiet->tbttcount = vap->iv_quiet_count_value; 2112 quiet->period = vap->iv_quiet_period; 2113 quiet->duration = htole16(vap->iv_quiet_duration); 2114 quiet->offset = htole16(vap->iv_quiet_offset); 2115 return frm + sizeof(*quiet); 2116 } 2117 2118 /* 2119 * Add an 11h Channel Switch Announcement element to a frame. 2120 * Note that we use the per-vap CSA count to adjust the global 2121 * counter so we can use this routine to form probe response 2122 * frames and get the current count. 2123 */ 2124 static uint8_t * 2125 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 2126 { 2127 struct ieee80211com *ic = vap->iv_ic; 2128 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 2129 2130 csa->csa_ie = IEEE80211_ELEMID_CSA; 2131 csa->csa_len = 3; 2132 csa->csa_mode = 1; /* XXX force quiet on channel */ 2133 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 2134 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 2135 return frm + sizeof(*csa); 2136 } 2137 2138 /* 2139 * Add an 11h country information element to a frame. 2140 */ 2141 static uint8_t * 2142 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 2143 { 2144 2145 if (ic->ic_countryie == NULL || 2146 ic->ic_countryie_chan != ic->ic_bsschan) { 2147 /* 2148 * Handle lazy construction of ie. This is done on 2149 * first use and after a channel change that requires 2150 * re-calculation. 2151 */ 2152 if (ic->ic_countryie != NULL) 2153 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 2154 ic->ic_countryie = ieee80211_alloc_countryie(ic); 2155 if (ic->ic_countryie == NULL) 2156 return frm; 2157 ic->ic_countryie_chan = ic->ic_bsschan; 2158 } 2159 return add_appie(frm, ic->ic_countryie); 2160 } 2161 2162 uint8_t * 2163 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap) 2164 { 2165 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) 2166 return (add_ie(frm, vap->iv_wpa_ie)); 2167 else { 2168 /* XXX else complain? */ 2169 return (frm); 2170 } 2171 } 2172 2173 uint8_t * 2174 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap) 2175 { 2176 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL) 2177 return (add_ie(frm, vap->iv_rsn_ie)); 2178 else { 2179 /* XXX else complain? */ 2180 return (frm); 2181 } 2182 } 2183 2184 uint8_t * 2185 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni) 2186 { 2187 if (ni->ni_flags & IEEE80211_NODE_QOS) { 2188 *frm++ = IEEE80211_ELEMID_QOS; 2189 *frm++ = 1; 2190 *frm++ = 0; 2191 } 2192 2193 return (frm); 2194 } 2195 2196 /* 2197 * Send a probe request frame with the specified ssid 2198 * and any optional information element data. 2199 */ 2200 int 2201 ieee80211_send_probereq(struct ieee80211_node *ni, 2202 const uint8_t sa[IEEE80211_ADDR_LEN], 2203 const uint8_t da[IEEE80211_ADDR_LEN], 2204 const uint8_t bssid[IEEE80211_ADDR_LEN], 2205 const uint8_t *ssid, size_t ssidlen) 2206 { 2207 struct ieee80211vap *vap = ni->ni_vap; 2208 struct ieee80211com *ic = ni->ni_ic; 2209 const struct ieee80211_txparam *tp; 2210 struct ieee80211_bpf_params params; 2211 struct ieee80211_frame *wh; 2212 const struct ieee80211_rateset *rs; 2213 struct mbuf *m; 2214 uint8_t *frm; 2215 int ret; 2216 2217 if (vap->iv_state == IEEE80211_S_CAC) { 2218 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 2219 "block %s frame in CAC state", "probe request"); 2220 vap->iv_stats.is_tx_badstate++; 2221 return EIO; /* XXX */ 2222 } 2223 2224 /* 2225 * Hold a reference on the node so it doesn't go away until after 2226 * the xmit is complete all the way in the driver. On error we 2227 * will remove our reference. 2228 */ 2229 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2230 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2231 __func__, __LINE__, 2232 ni, ether_sprintf(ni->ni_macaddr), 2233 ieee80211_node_refcnt(ni)+1); 2234 ieee80211_ref_node(ni); 2235 2236 /* 2237 * prreq frame format 2238 * [tlv] ssid 2239 * [tlv] supported rates 2240 * [tlv] RSN (optional) 2241 * [tlv] extended supported rates 2242 * [tlv] WPA (optional) 2243 * [tlv] user-specified ie's 2244 */ 2245 m = ieee80211_getmgtframe(&frm, 2246 ic->ic_headroom + sizeof(struct ieee80211_frame), 2247 2 + IEEE80211_NWID_LEN 2248 + 2 + IEEE80211_RATE_SIZE 2249 + sizeof(struct ieee80211_ie_wpa) 2250 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2251 + sizeof(struct ieee80211_ie_wpa) 2252 + (vap->iv_appie_probereq != NULL ? 2253 vap->iv_appie_probereq->ie_len : 0) 2254 ); 2255 if (m == NULL) { 2256 vap->iv_stats.is_tx_nobuf++; 2257 ieee80211_free_node(ni); 2258 return ENOMEM; 2259 } 2260 2261 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 2262 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 2263 frm = ieee80211_add_rates(frm, rs); 2264 frm = ieee80211_add_rsn(frm, vap); 2265 frm = ieee80211_add_xrates(frm, rs); 2266 frm = ieee80211_add_wpa(frm, vap); 2267 if (vap->iv_appie_probereq != NULL) 2268 frm = add_appie(frm, vap->iv_appie_probereq); 2269 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2270 2271 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 2272 ("leading space %zd", M_LEADINGSPACE(m))); 2273 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2274 if (m == NULL) { 2275 /* NB: cannot happen */ 2276 ieee80211_free_node(ni); 2277 return ENOMEM; 2278 } 2279 2280 IEEE80211_TX_LOCK(ic); 2281 wh = mtod(m, struct ieee80211_frame *); 2282 ieee80211_send_setup(ni, m, 2283 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 2284 IEEE80211_NONQOS_TID, sa, da, bssid); 2285 /* XXX power management? */ 2286 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2287 2288 M_WME_SETAC(m, WME_AC_BE); 2289 2290 IEEE80211_NODE_STAT(ni, tx_probereq); 2291 IEEE80211_NODE_STAT(ni, tx_mgmt); 2292 2293 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2294 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 2295 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 2296 (int)ssidlen, ssid); 2297 2298 memset(¶ms, 0, sizeof(params)); 2299 params.ibp_pri = M_WME_GETAC(m); 2300 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 2301 params.ibp_rate0 = tp->mgmtrate; 2302 if (IEEE80211_IS_MULTICAST(da)) { 2303 params.ibp_flags |= IEEE80211_BPF_NOACK; 2304 params.ibp_try0 = 1; 2305 } else 2306 params.ibp_try0 = tp->maxretry; 2307 params.ibp_power = ni->ni_txpower; 2308 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 2309 IEEE80211_TX_UNLOCK(ic); 2310 return (ret); 2311 } 2312 2313 /* 2314 * Calculate capability information for mgt frames. 2315 */ 2316 uint16_t 2317 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2318 { 2319 struct ieee80211com *ic = vap->iv_ic; 2320 uint16_t capinfo; 2321 2322 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2323 2324 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2325 capinfo = IEEE80211_CAPINFO_ESS; 2326 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2327 capinfo = IEEE80211_CAPINFO_IBSS; 2328 else 2329 capinfo = 0; 2330 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2331 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2332 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2333 IEEE80211_IS_CHAN_2GHZ(chan)) 2334 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2335 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2336 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2337 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2338 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2339 return capinfo; 2340 } 2341 2342 /* 2343 * Send a management frame. The node is for the destination (or ic_bss 2344 * when in station mode). Nodes other than ic_bss have their reference 2345 * count bumped to reflect our use for an indeterminant time. 2346 */ 2347 int 2348 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2349 { 2350 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2351 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2352 struct ieee80211vap *vap = ni->ni_vap; 2353 struct ieee80211com *ic = ni->ni_ic; 2354 struct ieee80211_node *bss = vap->iv_bss; 2355 struct ieee80211_bpf_params params; 2356 struct mbuf *m; 2357 uint8_t *frm; 2358 uint16_t capinfo; 2359 int has_challenge, is_shared_key, ret, status; 2360 2361 KASSERT(ni != NULL, ("null node")); 2362 2363 /* 2364 * Hold a reference on the node so it doesn't go away until after 2365 * the xmit is complete all the way in the driver. On error we 2366 * will remove our reference. 2367 */ 2368 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2369 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2370 __func__, __LINE__, 2371 ni, ether_sprintf(ni->ni_macaddr), 2372 ieee80211_node_refcnt(ni)+1); 2373 ieee80211_ref_node(ni); 2374 2375 memset(¶ms, 0, sizeof(params)); 2376 switch (type) { 2377 2378 case IEEE80211_FC0_SUBTYPE_AUTH: 2379 status = arg >> 16; 2380 arg &= 0xffff; 2381 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2382 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2383 ni->ni_challenge != NULL); 2384 2385 /* 2386 * Deduce whether we're doing open authentication or 2387 * shared key authentication. We do the latter if 2388 * we're in the middle of a shared key authentication 2389 * handshake or if we're initiating an authentication 2390 * request and configured to use shared key. 2391 */ 2392 is_shared_key = has_challenge || 2393 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2394 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2395 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2396 2397 m = ieee80211_getmgtframe(&frm, 2398 ic->ic_headroom + sizeof(struct ieee80211_frame), 2399 3 * sizeof(uint16_t) 2400 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2401 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2402 ); 2403 if (m == NULL) 2404 senderr(ENOMEM, is_tx_nobuf); 2405 2406 ((uint16_t *)frm)[0] = 2407 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2408 : htole16(IEEE80211_AUTH_ALG_OPEN); 2409 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2410 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2411 2412 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2413 ((uint16_t *)frm)[3] = 2414 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2415 IEEE80211_ELEMID_CHALLENGE); 2416 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2417 IEEE80211_CHALLENGE_LEN); 2418 m->m_pkthdr.len = m->m_len = 2419 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2420 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2421 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2422 "request encrypt frame (%s)", __func__); 2423 /* mark frame for encryption */ 2424 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2425 } 2426 } else 2427 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2428 2429 /* XXX not right for shared key */ 2430 if (status == IEEE80211_STATUS_SUCCESS) 2431 IEEE80211_NODE_STAT(ni, tx_auth); 2432 else 2433 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2434 2435 if (vap->iv_opmode == IEEE80211_M_STA) 2436 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2437 (void *) vap->iv_state); 2438 break; 2439 2440 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2441 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2442 "send station deauthenticate (reason: %d (%s))", arg, 2443 ieee80211_reason_to_string(arg)); 2444 m = ieee80211_getmgtframe(&frm, 2445 ic->ic_headroom + sizeof(struct ieee80211_frame), 2446 sizeof(uint16_t)); 2447 if (m == NULL) 2448 senderr(ENOMEM, is_tx_nobuf); 2449 *(uint16_t *)frm = htole16(arg); /* reason */ 2450 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2451 2452 IEEE80211_NODE_STAT(ni, tx_deauth); 2453 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2454 2455 ieee80211_node_unauthorize(ni); /* port closed */ 2456 break; 2457 2458 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2459 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2460 /* 2461 * asreq frame format 2462 * [2] capability information 2463 * [2] listen interval 2464 * [6*] current AP address (reassoc only) 2465 * [tlv] ssid 2466 * [tlv] supported rates 2467 * [tlv] extended supported rates 2468 * [4] power capability (optional) 2469 * [28] supported channels (optional) 2470 * [tlv] HT capabilities 2471 * [tlv] WME (optional) 2472 * [tlv] Vendor OUI HT capabilities (optional) 2473 * [tlv] Atheros capabilities (if negotiated) 2474 * [tlv] AppIE's (optional) 2475 */ 2476 m = ieee80211_getmgtframe(&frm, 2477 ic->ic_headroom + sizeof(struct ieee80211_frame), 2478 sizeof(uint16_t) 2479 + sizeof(uint16_t) 2480 + IEEE80211_ADDR_LEN 2481 + 2 + IEEE80211_NWID_LEN 2482 + 2 + IEEE80211_RATE_SIZE 2483 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2484 + 4 2485 + 2 + 26 2486 + sizeof(struct ieee80211_wme_info) 2487 + sizeof(struct ieee80211_ie_htcap) 2488 + 4 + sizeof(struct ieee80211_ie_htcap) 2489 #ifdef IEEE80211_SUPPORT_SUPERG 2490 + sizeof(struct ieee80211_ath_ie) 2491 #endif 2492 + (vap->iv_appie_wpa != NULL ? 2493 vap->iv_appie_wpa->ie_len : 0) 2494 + (vap->iv_appie_assocreq != NULL ? 2495 vap->iv_appie_assocreq->ie_len : 0) 2496 ); 2497 if (m == NULL) 2498 senderr(ENOMEM, is_tx_nobuf); 2499 2500 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2501 ("wrong mode %u", vap->iv_opmode)); 2502 capinfo = IEEE80211_CAPINFO_ESS; 2503 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2504 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2505 /* 2506 * NB: Some 11a AP's reject the request when 2507 * short premable is set. 2508 */ 2509 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2510 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2511 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2512 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2513 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2514 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2515 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2516 (vap->iv_flags & IEEE80211_F_DOTH)) 2517 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2518 *(uint16_t *)frm = htole16(capinfo); 2519 frm += 2; 2520 2521 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2522 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2523 bss->ni_intval)); 2524 frm += 2; 2525 2526 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2527 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2528 frm += IEEE80211_ADDR_LEN; 2529 } 2530 2531 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2532 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2533 frm = ieee80211_add_rsn(frm, vap); 2534 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2535 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2536 frm = ieee80211_add_powercapability(frm, 2537 ic->ic_curchan); 2538 frm = ieee80211_add_supportedchannels(frm, ic); 2539 } 2540 2541 /* 2542 * Check the channel - we may be using an 11n NIC with an 2543 * 11n capable station, but we're configured to be an 11b 2544 * channel. 2545 */ 2546 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2547 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2548 ni->ni_ies.htcap_ie != NULL && 2549 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) { 2550 frm = ieee80211_add_htcap(frm, ni); 2551 } 2552 frm = ieee80211_add_wpa(frm, vap); 2553 if ((ic->ic_flags & IEEE80211_F_WME) && 2554 ni->ni_ies.wme_ie != NULL) 2555 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2556 2557 /* 2558 * Same deal - only send HT info if we're on an 11n 2559 * capable channel. 2560 */ 2561 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2562 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2563 ni->ni_ies.htcap_ie != NULL && 2564 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) { 2565 frm = ieee80211_add_htcap_vendor(frm, ni); 2566 } 2567 #ifdef IEEE80211_SUPPORT_SUPERG 2568 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2569 frm = ieee80211_add_ath(frm, 2570 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2571 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2572 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2573 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2574 } 2575 #endif /* IEEE80211_SUPPORT_SUPERG */ 2576 if (vap->iv_appie_assocreq != NULL) 2577 frm = add_appie(frm, vap->iv_appie_assocreq); 2578 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2579 2580 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2581 (void *) vap->iv_state); 2582 break; 2583 2584 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2585 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2586 /* 2587 * asresp frame format 2588 * [2] capability information 2589 * [2] status 2590 * [2] association ID 2591 * [tlv] supported rates 2592 * [tlv] extended supported rates 2593 * [tlv] HT capabilities (standard, if STA enabled) 2594 * [tlv] HT information (standard, if STA enabled) 2595 * [tlv] WME (if configured and STA enabled) 2596 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2597 * [tlv] HT information (vendor OUI, if STA enabled) 2598 * [tlv] Atheros capabilities (if STA enabled) 2599 * [tlv] AppIE's (optional) 2600 */ 2601 m = ieee80211_getmgtframe(&frm, 2602 ic->ic_headroom + sizeof(struct ieee80211_frame), 2603 sizeof(uint16_t) 2604 + sizeof(uint16_t) 2605 + sizeof(uint16_t) 2606 + 2 + IEEE80211_RATE_SIZE 2607 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2608 + sizeof(struct ieee80211_ie_htcap) + 4 2609 + sizeof(struct ieee80211_ie_htinfo) + 4 2610 + sizeof(struct ieee80211_wme_param) 2611 #ifdef IEEE80211_SUPPORT_SUPERG 2612 + sizeof(struct ieee80211_ath_ie) 2613 #endif 2614 + (vap->iv_appie_assocresp != NULL ? 2615 vap->iv_appie_assocresp->ie_len : 0) 2616 ); 2617 if (m == NULL) 2618 senderr(ENOMEM, is_tx_nobuf); 2619 2620 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2621 *(uint16_t *)frm = htole16(capinfo); 2622 frm += 2; 2623 2624 *(uint16_t *)frm = htole16(arg); /* status */ 2625 frm += 2; 2626 2627 if (arg == IEEE80211_STATUS_SUCCESS) { 2628 *(uint16_t *)frm = htole16(ni->ni_associd); 2629 IEEE80211_NODE_STAT(ni, tx_assoc); 2630 } else 2631 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2632 frm += 2; 2633 2634 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2635 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2636 /* NB: respond according to what we received */ 2637 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2638 frm = ieee80211_add_htcap(frm, ni); 2639 frm = ieee80211_add_htinfo(frm, ni); 2640 } 2641 if ((vap->iv_flags & IEEE80211_F_WME) && 2642 ni->ni_ies.wme_ie != NULL) 2643 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2644 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2645 frm = ieee80211_add_htcap_vendor(frm, ni); 2646 frm = ieee80211_add_htinfo_vendor(frm, ni); 2647 } 2648 #ifdef IEEE80211_SUPPORT_SUPERG 2649 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2650 frm = ieee80211_add_ath(frm, 2651 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2652 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2653 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2654 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2655 #endif /* IEEE80211_SUPPORT_SUPERG */ 2656 if (vap->iv_appie_assocresp != NULL) 2657 frm = add_appie(frm, vap->iv_appie_assocresp); 2658 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2659 break; 2660 2661 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2662 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2663 "send station disassociate (reason: %d (%s))", arg, 2664 ieee80211_reason_to_string(arg)); 2665 m = ieee80211_getmgtframe(&frm, 2666 ic->ic_headroom + sizeof(struct ieee80211_frame), 2667 sizeof(uint16_t)); 2668 if (m == NULL) 2669 senderr(ENOMEM, is_tx_nobuf); 2670 *(uint16_t *)frm = htole16(arg); /* reason */ 2671 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2672 2673 IEEE80211_NODE_STAT(ni, tx_disassoc); 2674 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2675 break; 2676 2677 default: 2678 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2679 "invalid mgmt frame type %u", type); 2680 senderr(EINVAL, is_tx_unknownmgt); 2681 /* NOTREACHED */ 2682 } 2683 2684 /* NB: force non-ProbeResp frames to the highest queue */ 2685 params.ibp_pri = WME_AC_VO; 2686 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2687 /* NB: we know all frames are unicast */ 2688 params.ibp_try0 = bss->ni_txparms->maxretry; 2689 params.ibp_power = bss->ni_txpower; 2690 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2691 bad: 2692 ieee80211_free_node(ni); 2693 return ret; 2694 #undef senderr 2695 #undef HTFLAGS 2696 } 2697 2698 /* 2699 * Return an mbuf with a probe response frame in it. 2700 * Space is left to prepend and 802.11 header at the 2701 * front but it's left to the caller to fill in. 2702 */ 2703 struct mbuf * 2704 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2705 { 2706 struct ieee80211vap *vap = bss->ni_vap; 2707 struct ieee80211com *ic = bss->ni_ic; 2708 const struct ieee80211_rateset *rs; 2709 struct mbuf *m; 2710 uint16_t capinfo; 2711 uint8_t *frm; 2712 2713 /* 2714 * probe response frame format 2715 * [8] time stamp 2716 * [2] beacon interval 2717 * [2] cabability information 2718 * [tlv] ssid 2719 * [tlv] supported rates 2720 * [tlv] parameter set (FH/DS) 2721 * [tlv] parameter set (IBSS) 2722 * [tlv] country (optional) 2723 * [3] power control (optional) 2724 * [5] channel switch announcement (CSA) (optional) 2725 * [tlv] extended rate phy (ERP) 2726 * [tlv] extended supported rates 2727 * [tlv] RSN (optional) 2728 * [tlv] HT capabilities 2729 * [tlv] HT information 2730 * [tlv] WPA (optional) 2731 * [tlv] WME (optional) 2732 * [tlv] Vendor OUI HT capabilities (optional) 2733 * [tlv] Vendor OUI HT information (optional) 2734 * [tlv] Atheros capabilities 2735 * [tlv] AppIE's (optional) 2736 * [tlv] Mesh ID (MBSS) 2737 * [tlv] Mesh Conf (MBSS) 2738 */ 2739 m = ieee80211_getmgtframe(&frm, 2740 ic->ic_headroom + sizeof(struct ieee80211_frame), 2741 8 2742 + sizeof(uint16_t) 2743 + sizeof(uint16_t) 2744 + 2 + IEEE80211_NWID_LEN 2745 + 2 + IEEE80211_RATE_SIZE 2746 + 7 /* max(7,3) */ 2747 + IEEE80211_COUNTRY_MAX_SIZE 2748 + 3 2749 + sizeof(struct ieee80211_csa_ie) 2750 + sizeof(struct ieee80211_quiet_ie) 2751 + 3 2752 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2753 + sizeof(struct ieee80211_ie_wpa) 2754 + sizeof(struct ieee80211_ie_htcap) 2755 + sizeof(struct ieee80211_ie_htinfo) 2756 + sizeof(struct ieee80211_ie_wpa) 2757 + sizeof(struct ieee80211_wme_param) 2758 + 4 + sizeof(struct ieee80211_ie_htcap) 2759 + 4 + sizeof(struct ieee80211_ie_htinfo) 2760 #ifdef IEEE80211_SUPPORT_SUPERG 2761 + sizeof(struct ieee80211_ath_ie) 2762 #endif 2763 #ifdef IEEE80211_SUPPORT_MESH 2764 + 2 + IEEE80211_MESHID_LEN 2765 + sizeof(struct ieee80211_meshconf_ie) 2766 #endif 2767 + (vap->iv_appie_proberesp != NULL ? 2768 vap->iv_appie_proberesp->ie_len : 0) 2769 ); 2770 if (m == NULL) { 2771 vap->iv_stats.is_tx_nobuf++; 2772 return NULL; 2773 } 2774 2775 memset(frm, 0, 8); /* timestamp should be filled later */ 2776 frm += 8; 2777 *(uint16_t *)frm = htole16(bss->ni_intval); 2778 frm += 2; 2779 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2780 *(uint16_t *)frm = htole16(capinfo); 2781 frm += 2; 2782 2783 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2784 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2785 frm = ieee80211_add_rates(frm, rs); 2786 2787 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2788 *frm++ = IEEE80211_ELEMID_FHPARMS; 2789 *frm++ = 5; 2790 *frm++ = bss->ni_fhdwell & 0x00ff; 2791 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2792 *frm++ = IEEE80211_FH_CHANSET( 2793 ieee80211_chan2ieee(ic, bss->ni_chan)); 2794 *frm++ = IEEE80211_FH_CHANPAT( 2795 ieee80211_chan2ieee(ic, bss->ni_chan)); 2796 *frm++ = bss->ni_fhindex; 2797 } else { 2798 *frm++ = IEEE80211_ELEMID_DSPARMS; 2799 *frm++ = 1; 2800 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2801 } 2802 2803 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2804 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2805 *frm++ = 2; 2806 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2807 } 2808 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2809 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2810 frm = ieee80211_add_countryie(frm, ic); 2811 if (vap->iv_flags & IEEE80211_F_DOTH) { 2812 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2813 frm = ieee80211_add_powerconstraint(frm, vap); 2814 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2815 frm = ieee80211_add_csa(frm, vap); 2816 } 2817 if (vap->iv_flags & IEEE80211_F_DOTH) { 2818 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2819 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2820 if (vap->iv_quiet) 2821 frm = ieee80211_add_quiet(frm, vap); 2822 } 2823 } 2824 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2825 frm = ieee80211_add_erp(frm, ic); 2826 frm = ieee80211_add_xrates(frm, rs); 2827 frm = ieee80211_add_rsn(frm, vap); 2828 /* 2829 * NB: legacy 11b clients do not get certain ie's. 2830 * The caller identifies such clients by passing 2831 * a token in legacy to us. Could expand this to be 2832 * any legacy client for stuff like HT ie's. 2833 */ 2834 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2835 legacy != IEEE80211_SEND_LEGACY_11B) { 2836 frm = ieee80211_add_htcap(frm, bss); 2837 frm = ieee80211_add_htinfo(frm, bss); 2838 } 2839 frm = ieee80211_add_wpa(frm, vap); 2840 if (vap->iv_flags & IEEE80211_F_WME) 2841 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2842 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2843 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2844 legacy != IEEE80211_SEND_LEGACY_11B) { 2845 frm = ieee80211_add_htcap_vendor(frm, bss); 2846 frm = ieee80211_add_htinfo_vendor(frm, bss); 2847 } 2848 #ifdef IEEE80211_SUPPORT_SUPERG 2849 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2850 legacy != IEEE80211_SEND_LEGACY_11B) 2851 frm = ieee80211_add_athcaps(frm, bss); 2852 #endif 2853 if (vap->iv_appie_proberesp != NULL) 2854 frm = add_appie(frm, vap->iv_appie_proberesp); 2855 #ifdef IEEE80211_SUPPORT_MESH 2856 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2857 frm = ieee80211_add_meshid(frm, vap); 2858 frm = ieee80211_add_meshconf(frm, vap); 2859 } 2860 #endif 2861 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2862 2863 return m; 2864 } 2865 2866 /* 2867 * Send a probe response frame to the specified mac address. 2868 * This does not go through the normal mgt frame api so we 2869 * can specify the destination address and re-use the bss node 2870 * for the sta reference. 2871 */ 2872 int 2873 ieee80211_send_proberesp(struct ieee80211vap *vap, 2874 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2875 { 2876 struct ieee80211_node *bss = vap->iv_bss; 2877 struct ieee80211com *ic = vap->iv_ic; 2878 struct ieee80211_frame *wh; 2879 struct mbuf *m; 2880 int ret; 2881 2882 if (vap->iv_state == IEEE80211_S_CAC) { 2883 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2884 "block %s frame in CAC state", "probe response"); 2885 vap->iv_stats.is_tx_badstate++; 2886 return EIO; /* XXX */ 2887 } 2888 2889 /* 2890 * Hold a reference on the node so it doesn't go away until after 2891 * the xmit is complete all the way in the driver. On error we 2892 * will remove our reference. 2893 */ 2894 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2895 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2896 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2897 ieee80211_node_refcnt(bss)+1); 2898 ieee80211_ref_node(bss); 2899 2900 m = ieee80211_alloc_proberesp(bss, legacy); 2901 if (m == NULL) { 2902 ieee80211_free_node(bss); 2903 return ENOMEM; 2904 } 2905 2906 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2907 KASSERT(m != NULL, ("no room for header")); 2908 2909 IEEE80211_TX_LOCK(ic); 2910 wh = mtod(m, struct ieee80211_frame *); 2911 ieee80211_send_setup(bss, m, 2912 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2913 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2914 /* XXX power management? */ 2915 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2916 2917 M_WME_SETAC(m, WME_AC_BE); 2918 2919 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2920 "send probe resp on channel %u to %s%s\n", 2921 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2922 legacy ? " <legacy>" : ""); 2923 IEEE80211_NODE_STAT(bss, tx_mgmt); 2924 2925 ret = ieee80211_raw_output(vap, bss, m, NULL); 2926 IEEE80211_TX_UNLOCK(ic); 2927 return (ret); 2928 } 2929 2930 /* 2931 * Allocate and build a RTS (Request To Send) control frame. 2932 */ 2933 struct mbuf * 2934 ieee80211_alloc_rts(struct ieee80211com *ic, 2935 const uint8_t ra[IEEE80211_ADDR_LEN], 2936 const uint8_t ta[IEEE80211_ADDR_LEN], 2937 uint16_t dur) 2938 { 2939 struct ieee80211_frame_rts *rts; 2940 struct mbuf *m; 2941 2942 /* XXX honor ic_headroom */ 2943 m = m_gethdr(M_NOWAIT, MT_DATA); 2944 if (m != NULL) { 2945 rts = mtod(m, struct ieee80211_frame_rts *); 2946 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2947 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2948 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2949 *(u_int16_t *)rts->i_dur = htole16(dur); 2950 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2951 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2952 2953 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2954 } 2955 return m; 2956 } 2957 2958 /* 2959 * Allocate and build a CTS (Clear To Send) control frame. 2960 */ 2961 struct mbuf * 2962 ieee80211_alloc_cts(struct ieee80211com *ic, 2963 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2964 { 2965 struct ieee80211_frame_cts *cts; 2966 struct mbuf *m; 2967 2968 /* XXX honor ic_headroom */ 2969 m = m_gethdr(M_NOWAIT, MT_DATA); 2970 if (m != NULL) { 2971 cts = mtod(m, struct ieee80211_frame_cts *); 2972 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2973 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2974 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2975 *(u_int16_t *)cts->i_dur = htole16(dur); 2976 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2977 2978 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2979 } 2980 return m; 2981 } 2982 2983 static void 2984 ieee80211_tx_mgt_timeout(void *arg) 2985 { 2986 struct ieee80211vap *vap = arg; 2987 2988 IEEE80211_LOCK(vap->iv_ic); 2989 if (vap->iv_state != IEEE80211_S_INIT && 2990 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2991 /* 2992 * NB: it's safe to specify a timeout as the reason here; 2993 * it'll only be used in the right state. 2994 */ 2995 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN, 2996 IEEE80211_SCAN_FAIL_TIMEOUT); 2997 } 2998 IEEE80211_UNLOCK(vap->iv_ic); 2999 } 3000 3001 /* 3002 * This is the callback set on net80211-sourced transmitted 3003 * authentication request frames. 3004 * 3005 * This does a couple of things: 3006 * 3007 * + If the frame transmitted was a success, it schedules a future 3008 * event which will transition the interface to scan. 3009 * If a state transition _then_ occurs before that event occurs, 3010 * said state transition will cancel this callout. 3011 * 3012 * + If the frame transmit was a failure, it immediately schedules 3013 * the transition back to scan. 3014 */ 3015 static void 3016 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 3017 { 3018 struct ieee80211vap *vap = ni->ni_vap; 3019 enum ieee80211_state ostate = (enum ieee80211_state) arg; 3020 3021 /* 3022 * Frame transmit completed; arrange timer callback. If 3023 * transmit was successfully we wait for response. Otherwise 3024 * we arrange an immediate callback instead of doing the 3025 * callback directly since we don't know what state the driver 3026 * is in (e.g. what locks it is holding). This work should 3027 * not be too time-critical and not happen too often so the 3028 * added overhead is acceptable. 3029 * 3030 * XXX what happens if !acked but response shows up before callback? 3031 */ 3032 if (vap->iv_state == ostate) { 3033 callout_reset(&vap->iv_mgtsend, 3034 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 3035 ieee80211_tx_mgt_timeout, vap); 3036 } 3037 } 3038 3039 static void 3040 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 3041 struct ieee80211_node *ni) 3042 { 3043 struct ieee80211vap *vap = ni->ni_vap; 3044 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 3045 struct ieee80211com *ic = ni->ni_ic; 3046 struct ieee80211_rateset *rs = &ni->ni_rates; 3047 uint16_t capinfo; 3048 3049 /* 3050 * beacon frame format 3051 * [8] time stamp 3052 * [2] beacon interval 3053 * [2] cabability information 3054 * [tlv] ssid 3055 * [tlv] supported rates 3056 * [3] parameter set (DS) 3057 * [8] CF parameter set (optional) 3058 * [tlv] parameter set (IBSS/TIM) 3059 * [tlv] country (optional) 3060 * [3] power control (optional) 3061 * [5] channel switch announcement (CSA) (optional) 3062 * [tlv] extended rate phy (ERP) 3063 * [tlv] extended supported rates 3064 * [tlv] RSN parameters 3065 * [tlv] HT capabilities 3066 * [tlv] HT information 3067 * XXX Vendor-specific OIDs (e.g. Atheros) 3068 * [tlv] WPA parameters 3069 * [tlv] WME parameters 3070 * [tlv] Vendor OUI HT capabilities (optional) 3071 * [tlv] Vendor OUI HT information (optional) 3072 * [tlv] Atheros capabilities (optional) 3073 * [tlv] TDMA parameters (optional) 3074 * [tlv] Mesh ID (MBSS) 3075 * [tlv] Mesh Conf (MBSS) 3076 * [tlv] application data (optional) 3077 */ 3078 3079 memset(bo, 0, sizeof(*bo)); 3080 3081 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 3082 frm += 8; 3083 *(uint16_t *)frm = htole16(ni->ni_intval); 3084 frm += 2; 3085 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3086 bo->bo_caps = (uint16_t *)frm; 3087 *(uint16_t *)frm = htole16(capinfo); 3088 frm += 2; 3089 *frm++ = IEEE80211_ELEMID_SSID; 3090 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 3091 *frm++ = ni->ni_esslen; 3092 memcpy(frm, ni->ni_essid, ni->ni_esslen); 3093 frm += ni->ni_esslen; 3094 } else 3095 *frm++ = 0; 3096 frm = ieee80211_add_rates(frm, rs); 3097 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 3098 *frm++ = IEEE80211_ELEMID_DSPARMS; 3099 *frm++ = 1; 3100 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 3101 } 3102 if (ic->ic_flags & IEEE80211_F_PCF) { 3103 bo->bo_cfp = frm; 3104 frm = ieee80211_add_cfparms(frm, ic); 3105 } 3106 bo->bo_tim = frm; 3107 if (vap->iv_opmode == IEEE80211_M_IBSS) { 3108 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 3109 *frm++ = 2; 3110 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 3111 bo->bo_tim_len = 0; 3112 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3113 vap->iv_opmode == IEEE80211_M_MBSS) { 3114 /* TIM IE is the same for Mesh and Hostap */ 3115 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 3116 3117 tie->tim_ie = IEEE80211_ELEMID_TIM; 3118 tie->tim_len = 4; /* length */ 3119 tie->tim_count = 0; /* DTIM count */ 3120 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 3121 tie->tim_bitctl = 0; /* bitmap control */ 3122 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 3123 frm += sizeof(struct ieee80211_tim_ie); 3124 bo->bo_tim_len = 1; 3125 } 3126 bo->bo_tim_trailer = frm; 3127 if ((vap->iv_flags & IEEE80211_F_DOTH) || 3128 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 3129 frm = ieee80211_add_countryie(frm, ic); 3130 if (vap->iv_flags & IEEE80211_F_DOTH) { 3131 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 3132 frm = ieee80211_add_powerconstraint(frm, vap); 3133 bo->bo_csa = frm; 3134 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 3135 frm = ieee80211_add_csa(frm, vap); 3136 } else 3137 bo->bo_csa = frm; 3138 3139 if (vap->iv_flags & IEEE80211_F_DOTH) { 3140 bo->bo_quiet = frm; 3141 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3142 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 3143 if (vap->iv_quiet) 3144 frm = ieee80211_add_quiet(frm,vap); 3145 } 3146 } else 3147 bo->bo_quiet = frm; 3148 3149 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 3150 bo->bo_erp = frm; 3151 frm = ieee80211_add_erp(frm, ic); 3152 } 3153 frm = ieee80211_add_xrates(frm, rs); 3154 frm = ieee80211_add_rsn(frm, vap); 3155 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 3156 frm = ieee80211_add_htcap(frm, ni); 3157 bo->bo_htinfo = frm; 3158 frm = ieee80211_add_htinfo(frm, ni); 3159 } 3160 frm = ieee80211_add_wpa(frm, vap); 3161 if (vap->iv_flags & IEEE80211_F_WME) { 3162 bo->bo_wme = frm; 3163 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 3164 } 3165 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 3166 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 3167 frm = ieee80211_add_htcap_vendor(frm, ni); 3168 frm = ieee80211_add_htinfo_vendor(frm, ni); 3169 } 3170 #ifdef IEEE80211_SUPPORT_SUPERG 3171 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 3172 bo->bo_ath = frm; 3173 frm = ieee80211_add_athcaps(frm, ni); 3174 } 3175 #endif 3176 #ifdef IEEE80211_SUPPORT_TDMA 3177 if (vap->iv_caps & IEEE80211_C_TDMA) { 3178 bo->bo_tdma = frm; 3179 frm = ieee80211_add_tdma(frm, vap); 3180 } 3181 #endif 3182 if (vap->iv_appie_beacon != NULL) { 3183 bo->bo_appie = frm; 3184 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 3185 frm = add_appie(frm, vap->iv_appie_beacon); 3186 } 3187 #ifdef IEEE80211_SUPPORT_MESH 3188 if (vap->iv_opmode == IEEE80211_M_MBSS) { 3189 frm = ieee80211_add_meshid(frm, vap); 3190 bo->bo_meshconf = frm; 3191 frm = ieee80211_add_meshconf(frm, vap); 3192 } 3193 #endif 3194 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 3195 bo->bo_csa_trailer_len = frm - bo->bo_csa; 3196 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 3197 } 3198 3199 /* 3200 * Allocate a beacon frame and fillin the appropriate bits. 3201 */ 3202 struct mbuf * 3203 ieee80211_beacon_alloc(struct ieee80211_node *ni) 3204 { 3205 struct ieee80211vap *vap = ni->ni_vap; 3206 struct ieee80211com *ic = ni->ni_ic; 3207 struct ifnet *ifp = vap->iv_ifp; 3208 struct ieee80211_frame *wh; 3209 struct mbuf *m; 3210 int pktlen; 3211 uint8_t *frm; 3212 3213 /* 3214 * beacon frame format 3215 * [8] time stamp 3216 * [2] beacon interval 3217 * [2] cabability information 3218 * [tlv] ssid 3219 * [tlv] supported rates 3220 * [3] parameter set (DS) 3221 * [8] CF parameter set (optional) 3222 * [tlv] parameter set (IBSS/TIM) 3223 * [tlv] country (optional) 3224 * [3] power control (optional) 3225 * [5] channel switch announcement (CSA) (optional) 3226 * [tlv] extended rate phy (ERP) 3227 * [tlv] extended supported rates 3228 * [tlv] RSN parameters 3229 * [tlv] HT capabilities 3230 * [tlv] HT information 3231 * [tlv] Vendor OUI HT capabilities (optional) 3232 * [tlv] Vendor OUI HT information (optional) 3233 * XXX Vendor-specific OIDs (e.g. Atheros) 3234 * [tlv] WPA parameters 3235 * [tlv] WME parameters 3236 * [tlv] TDMA parameters (optional) 3237 * [tlv] Mesh ID (MBSS) 3238 * [tlv] Mesh Conf (MBSS) 3239 * [tlv] application data (optional) 3240 * NB: we allocate the max space required for the TIM bitmap. 3241 * XXX how big is this? 3242 */ 3243 pktlen = 8 /* time stamp */ 3244 + sizeof(uint16_t) /* beacon interval */ 3245 + sizeof(uint16_t) /* capabilities */ 3246 + 2 + ni->ni_esslen /* ssid */ 3247 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 3248 + 2 + 1 /* DS parameters */ 3249 + 2 + 6 /* CF parameters */ 3250 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 3251 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 3252 + 2 + 1 /* power control */ 3253 + sizeof(struct ieee80211_csa_ie) /* CSA */ 3254 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 3255 + 2 + 1 /* ERP */ 3256 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 3257 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 3258 2*sizeof(struct ieee80211_ie_wpa) : 0) 3259 /* XXX conditional? */ 3260 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 3261 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 3262 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 3263 sizeof(struct ieee80211_wme_param) : 0) 3264 #ifdef IEEE80211_SUPPORT_SUPERG 3265 + sizeof(struct ieee80211_ath_ie) /* ATH */ 3266 #endif 3267 #ifdef IEEE80211_SUPPORT_TDMA 3268 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 3269 sizeof(struct ieee80211_tdma_param) : 0) 3270 #endif 3271 #ifdef IEEE80211_SUPPORT_MESH 3272 + 2 + ni->ni_meshidlen 3273 + sizeof(struct ieee80211_meshconf_ie) 3274 #endif 3275 + IEEE80211_MAX_APPIE 3276 ; 3277 m = ieee80211_getmgtframe(&frm, 3278 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 3279 if (m == NULL) { 3280 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 3281 "%s: cannot get buf; size %u\n", __func__, pktlen); 3282 vap->iv_stats.is_tx_nobuf++; 3283 return NULL; 3284 } 3285 ieee80211_beacon_construct(m, frm, ni); 3286 3287 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 3288 KASSERT(m != NULL, ("no space for 802.11 header?")); 3289 wh = mtod(m, struct ieee80211_frame *); 3290 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 3291 IEEE80211_FC0_SUBTYPE_BEACON; 3292 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 3293 *(uint16_t *)wh->i_dur = 0; 3294 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 3295 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 3296 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 3297 *(uint16_t *)wh->i_seq = 0; 3298 3299 return m; 3300 } 3301 3302 /* 3303 * Update the dynamic parts of a beacon frame based on the current state. 3304 */ 3305 int 3306 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast) 3307 { 3308 struct ieee80211vap *vap = ni->ni_vap; 3309 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 3310 struct ieee80211com *ic = ni->ni_ic; 3311 int len_changed = 0; 3312 uint16_t capinfo; 3313 struct ieee80211_frame *wh; 3314 ieee80211_seq seqno; 3315 3316 IEEE80211_LOCK(ic); 3317 /* 3318 * Handle 11h channel change when we've reached the count. 3319 * We must recalculate the beacon frame contents to account 3320 * for the new channel. Note we do this only for the first 3321 * vap that reaches this point; subsequent vaps just update 3322 * their beacon state to reflect the recalculated channel. 3323 */ 3324 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3325 vap->iv_csa_count == ic->ic_csa_count) { 3326 vap->iv_csa_count = 0; 3327 /* 3328 * Effect channel change before reconstructing the beacon 3329 * frame contents as many places reference ni_chan. 3330 */ 3331 if (ic->ic_csa_newchan != NULL) 3332 ieee80211_csa_completeswitch(ic); 3333 /* 3334 * NB: ieee80211_beacon_construct clears all pending 3335 * updates in bo_flags so we don't need to explicitly 3336 * clear IEEE80211_BEACON_CSA. 3337 */ 3338 ieee80211_beacon_construct(m, 3339 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni); 3340 3341 /* XXX do WME aggressive mode processing? */ 3342 IEEE80211_UNLOCK(ic); 3343 return 1; /* just assume length changed */ 3344 } 3345 3346 wh = mtod(m, struct ieee80211_frame *); 3347 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3348 *(uint16_t *)&wh->i_seq[0] = 3349 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3350 M_SEQNO_SET(m, seqno); 3351 3352 /* XXX faster to recalculate entirely or just changes? */ 3353 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3354 *bo->bo_caps = htole16(capinfo); 3355 3356 if (vap->iv_flags & IEEE80211_F_WME) { 3357 struct ieee80211_wme_state *wme = &ic->ic_wme; 3358 3359 /* 3360 * Check for aggressive mode change. When there is 3361 * significant high priority traffic in the BSS 3362 * throttle back BE traffic by using conservative 3363 * parameters. Otherwise BE uses aggressive params 3364 * to optimize performance of legacy/non-QoS traffic. 3365 */ 3366 if (wme->wme_flags & WME_F_AGGRMODE) { 3367 if (wme->wme_hipri_traffic > 3368 wme->wme_hipri_switch_thresh) { 3369 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3370 "%s: traffic %u, disable aggressive mode\n", 3371 __func__, wme->wme_hipri_traffic); 3372 wme->wme_flags &= ~WME_F_AGGRMODE; 3373 ieee80211_wme_updateparams_locked(vap); 3374 wme->wme_hipri_traffic = 3375 wme->wme_hipri_switch_hysteresis; 3376 } else 3377 wme->wme_hipri_traffic = 0; 3378 } else { 3379 if (wme->wme_hipri_traffic <= 3380 wme->wme_hipri_switch_thresh) { 3381 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3382 "%s: traffic %u, enable aggressive mode\n", 3383 __func__, wme->wme_hipri_traffic); 3384 wme->wme_flags |= WME_F_AGGRMODE; 3385 ieee80211_wme_updateparams_locked(vap); 3386 wme->wme_hipri_traffic = 0; 3387 } else 3388 wme->wme_hipri_traffic = 3389 wme->wme_hipri_switch_hysteresis; 3390 } 3391 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3392 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3393 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3394 } 3395 } 3396 3397 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3398 ieee80211_ht_update_beacon(vap, bo); 3399 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3400 } 3401 #ifdef IEEE80211_SUPPORT_TDMA 3402 if (vap->iv_caps & IEEE80211_C_TDMA) { 3403 /* 3404 * NB: the beacon is potentially updated every TBTT. 3405 */ 3406 ieee80211_tdma_update_beacon(vap, bo); 3407 } 3408 #endif 3409 #ifdef IEEE80211_SUPPORT_MESH 3410 if (vap->iv_opmode == IEEE80211_M_MBSS) 3411 ieee80211_mesh_update_beacon(vap, bo); 3412 #endif 3413 3414 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3415 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3416 struct ieee80211_tim_ie *tie = 3417 (struct ieee80211_tim_ie *) bo->bo_tim; 3418 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3419 u_int timlen, timoff, i; 3420 /* 3421 * ATIM/DTIM needs updating. If it fits in the 3422 * current space allocated then just copy in the 3423 * new bits. Otherwise we need to move any trailing 3424 * data to make room. Note that we know there is 3425 * contiguous space because ieee80211_beacon_allocate 3426 * insures there is space in the mbuf to write a 3427 * maximal-size virtual bitmap (based on iv_max_aid). 3428 */ 3429 /* 3430 * Calculate the bitmap size and offset, copy any 3431 * trailer out of the way, and then copy in the 3432 * new bitmap and update the information element. 3433 * Note that the tim bitmap must contain at least 3434 * one byte and any offset must be even. 3435 */ 3436 if (vap->iv_ps_pending != 0) { 3437 timoff = 128; /* impossibly large */ 3438 for (i = 0; i < vap->iv_tim_len; i++) 3439 if (vap->iv_tim_bitmap[i]) { 3440 timoff = i &~ 1; 3441 break; 3442 } 3443 KASSERT(timoff != 128, ("tim bitmap empty!")); 3444 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3445 if (vap->iv_tim_bitmap[i]) 3446 break; 3447 timlen = 1 + (i - timoff); 3448 } else { 3449 timoff = 0; 3450 timlen = 1; 3451 } 3452 if (timlen != bo->bo_tim_len) { 3453 /* copy up/down trailer */ 3454 int adjust = tie->tim_bitmap+timlen 3455 - bo->bo_tim_trailer; 3456 bcopy(bo->bo_tim_trailer, 3457 bo->bo_tim_trailer+adjust, 3458 bo->bo_tim_trailer_len); 3459 bo->bo_tim_trailer += adjust; 3460 bo->bo_erp += adjust; 3461 bo->bo_htinfo += adjust; 3462 #ifdef IEEE80211_SUPPORT_SUPERG 3463 bo->bo_ath += adjust; 3464 #endif 3465 #ifdef IEEE80211_SUPPORT_TDMA 3466 bo->bo_tdma += adjust; 3467 #endif 3468 #ifdef IEEE80211_SUPPORT_MESH 3469 bo->bo_meshconf += adjust; 3470 #endif 3471 bo->bo_appie += adjust; 3472 bo->bo_wme += adjust; 3473 bo->bo_csa += adjust; 3474 bo->bo_quiet += adjust; 3475 bo->bo_tim_len = timlen; 3476 3477 /* update information element */ 3478 tie->tim_len = 3 + timlen; 3479 tie->tim_bitctl = timoff; 3480 len_changed = 1; 3481 } 3482 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3483 bo->bo_tim_len); 3484 3485 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3486 3487 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3488 "%s: TIM updated, pending %u, off %u, len %u\n", 3489 __func__, vap->iv_ps_pending, timoff, timlen); 3490 } 3491 /* count down DTIM period */ 3492 if (tie->tim_count == 0) 3493 tie->tim_count = tie->tim_period - 1; 3494 else 3495 tie->tim_count--; 3496 /* update state for buffered multicast frames on DTIM */ 3497 if (mcast && tie->tim_count == 0) 3498 tie->tim_bitctl |= 1; 3499 else 3500 tie->tim_bitctl &= ~1; 3501 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3502 struct ieee80211_csa_ie *csa = 3503 (struct ieee80211_csa_ie *) bo->bo_csa; 3504 3505 /* 3506 * Insert or update CSA ie. If we're just starting 3507 * to count down to the channel switch then we need 3508 * to insert the CSA ie. Otherwise we just need to 3509 * drop the count. The actual change happens above 3510 * when the vap's count reaches the target count. 3511 */ 3512 if (vap->iv_csa_count == 0) { 3513 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3514 bo->bo_erp += sizeof(*csa); 3515 bo->bo_htinfo += sizeof(*csa); 3516 bo->bo_wme += sizeof(*csa); 3517 #ifdef IEEE80211_SUPPORT_SUPERG 3518 bo->bo_ath += sizeof(*csa); 3519 #endif 3520 #ifdef IEEE80211_SUPPORT_TDMA 3521 bo->bo_tdma += sizeof(*csa); 3522 #endif 3523 #ifdef IEEE80211_SUPPORT_MESH 3524 bo->bo_meshconf += sizeof(*csa); 3525 #endif 3526 bo->bo_appie += sizeof(*csa); 3527 bo->bo_csa_trailer_len += sizeof(*csa); 3528 bo->bo_quiet += sizeof(*csa); 3529 bo->bo_tim_trailer_len += sizeof(*csa); 3530 m->m_len += sizeof(*csa); 3531 m->m_pkthdr.len += sizeof(*csa); 3532 3533 ieee80211_add_csa(bo->bo_csa, vap); 3534 } else 3535 csa->csa_count--; 3536 vap->iv_csa_count++; 3537 /* NB: don't clear IEEE80211_BEACON_CSA */ 3538 } 3539 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3540 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3541 if (vap->iv_quiet) 3542 ieee80211_add_quiet(bo->bo_quiet, vap); 3543 } 3544 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3545 /* 3546 * ERP element needs updating. 3547 */ 3548 (void) ieee80211_add_erp(bo->bo_erp, ic); 3549 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3550 } 3551 #ifdef IEEE80211_SUPPORT_SUPERG 3552 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3553 ieee80211_add_athcaps(bo->bo_ath, ni); 3554 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3555 } 3556 #endif 3557 } 3558 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3559 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3560 int aielen; 3561 uint8_t *frm; 3562 3563 aielen = 0; 3564 if (aie != NULL) 3565 aielen += aie->ie_len; 3566 if (aielen != bo->bo_appie_len) { 3567 /* copy up/down trailer */ 3568 int adjust = aielen - bo->bo_appie_len; 3569 bcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3570 bo->bo_tim_trailer_len); 3571 bo->bo_tim_trailer += adjust; 3572 bo->bo_appie += adjust; 3573 bo->bo_appie_len = aielen; 3574 3575 len_changed = 1; 3576 } 3577 frm = bo->bo_appie; 3578 if (aie != NULL) 3579 frm = add_appie(frm, aie); 3580 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3581 } 3582 IEEE80211_UNLOCK(ic); 3583 3584 return len_changed; 3585 } 3586 3587 /* 3588 * Do Ethernet-LLC encapsulation for each payload in a fast frame 3589 * tunnel encapsulation. The frame is assumed to have an Ethernet 3590 * header at the front that must be stripped before prepending the 3591 * LLC followed by the Ethernet header passed in (with an Ethernet 3592 * type that specifies the payload size). 3593 */ 3594 struct mbuf * 3595 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 3596 const struct ether_header *eh) 3597 { 3598 struct llc *llc; 3599 uint16_t payload; 3600 3601 /* XXX optimize by combining m_adj+M_PREPEND */ 3602 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 3603 llc = mtod(m, struct llc *); 3604 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 3605 llc->llc_control = LLC_UI; 3606 llc->llc_snap.org_code[0] = 0; 3607 llc->llc_snap.org_code[1] = 0; 3608 llc->llc_snap.org_code[2] = 0; 3609 llc->llc_snap.ether_type = eh->ether_type; 3610 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 3611 3612 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 3613 if (m == NULL) { /* XXX cannot happen */ 3614 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 3615 "%s: no space for ether_header\n", __func__); 3616 vap->iv_stats.is_tx_nobuf++; 3617 return NULL; 3618 } 3619 ETHER_HEADER_COPY(mtod(m, void *), eh); 3620 mtod(m, struct ether_header *)->ether_type = htons(payload); 3621 return m; 3622 } 3623 3624 /* 3625 * Complete an mbuf transmission. 3626 * 3627 * For now, this simply processes a completed frame after the 3628 * driver has completed it's transmission and/or retransmission. 3629 * It assumes the frame is an 802.11 encapsulated frame. 3630 * 3631 * Later on it will grow to become the exit path for a given frame 3632 * from the driver and, depending upon how it's been encapsulated 3633 * and already transmitted, it may end up doing A-MPDU retransmission, 3634 * power save requeuing, etc. 3635 * 3636 * In order for the above to work, the driver entry point to this 3637 * must not hold any driver locks. Thus, the driver needs to delay 3638 * any actual mbuf completion until it can release said locks. 3639 * 3640 * This frees the mbuf and if the mbuf has a node reference, 3641 * the node reference will be freed. 3642 */ 3643 void 3644 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status) 3645 { 3646 3647 if (ni != NULL) { 3648 struct ifnet *ifp = ni->ni_vap->iv_ifp; 3649 3650 if (status == 0) { 3651 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 3652 #if defined(__DragonFly__) 3653 /* 3654 * On DragonFly, IFCOUNTER_OBYTES and 3655 * IFCOUNTER_OMCASTS increments are currently done 3656 * by ifq_dispatch() already. 3657 */ 3658 #else 3659 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 3660 if (m->m_flags & M_MCAST) 3661 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 3662 #endif 3663 } else 3664 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 3665 if (m->m_flags & M_TXCB) 3666 ieee80211_process_callback(ni, m, status); 3667 ieee80211_free_node(ni); 3668 } 3669 m_freem(m); 3670 } 3671