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 * $FreeBSD: head/sys/net80211/ieee80211_output.c 198384 2009-10-23 11:13:08Z rpaulo $ 27 * $DragonFly$ 28 */ 29 30 #include "opt_inet.h" 31 #include "opt_inet6.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/kernel.h> 38 #include <sys/endian.h> 39 40 #include <sys/socket.h> 41 42 #include <net/bpf.h> 43 #include <net/ethernet.h> 44 #include <net/route.h> 45 #include <net/if.h> 46 #include <net/if_llc.h> 47 #include <net/if_media.h> 48 #include <net/ifq_var.h> 49 50 #include <netproto/802_11/ieee80211_var.h> 51 #include <netproto/802_11/ieee80211_regdomain.h> 52 #ifdef IEEE80211_SUPPORT_SUPERG 53 #include <netproto/802_11/ieee80211_superg.h> 54 #endif 55 #ifdef IEEE80211_SUPPORT_TDMA 56 #include <netproto/802_11/ieee80211_tdma.h> 57 #endif 58 #include <netproto/802_11/ieee80211_wds.h> 59 #include <netproto/802_11/ieee80211_mesh.h> 60 61 #ifdef INET 62 #include <netinet/in.h> 63 #include <netinet/if_ether.h> 64 #include <netinet/in_systm.h> 65 #include <netinet/ip.h> 66 #endif 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 71 #define ETHER_HEADER_COPY(dst, src) \ 72 memcpy(dst, src, sizeof(struct ether_header)) 73 74 /* unalligned little endian access */ 75 #define LE_WRITE_2(p, v) do { \ 76 ((uint8_t *)(p))[0] = (v) & 0xff; \ 77 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 78 } while (0) 79 #define LE_WRITE_4(p, v) do { \ 80 ((uint8_t *)(p))[0] = (v) & 0xff; \ 81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 82 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 83 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 84 } while (0) 85 86 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 87 u_int hdrsize, u_int ciphdrsize, u_int mtu); 88 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 89 90 #ifdef IEEE80211_DEBUG 91 /* 92 * Decide if an outbound management frame should be 93 * printed when debugging is enabled. This filters some 94 * of the less interesting frames that come frequently 95 * (e.g. beacons). 96 */ 97 static __inline int 98 doprint(struct ieee80211vap *vap, int subtype) 99 { 100 switch (subtype) { 101 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 102 return (vap->iv_opmode == IEEE80211_M_IBSS); 103 } 104 return 1; 105 } 106 #endif 107 108 /* 109 * Start method for vap's. All packets from the stack come 110 * through here. We handle common processing of the packets 111 * before dispatching them to the underlying device. 112 */ 113 void 114 ieee80211_start(struct ifnet *ifp) 115 { 116 #define IS_DWDS(vap) \ 117 (vap->iv_opmode == IEEE80211_M_WDS && \ 118 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 119 struct ieee80211vap *vap = ifp->if_softc; 120 struct ieee80211com *ic = vap->iv_ic; 121 struct ifnet *parent = ic->ic_ifp; 122 struct ieee80211_node *ni; 123 struct mbuf *m = NULL; 124 struct ether_header *eh; 125 int error; 126 127 /* NB: parent must be up and running */ 128 if (!IFNET_IS_UP_RUNNING(parent)) { 129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 130 "%s: ignore queue, parent %s not up+running\n", 131 __func__, parent->if_xname); 132 /* XXX stat */ 133 ifq_purge(&ifp->if_snd); 134 return; 135 } 136 if (vap->iv_state == IEEE80211_S_SLEEP) { 137 /* 138 * In power save, wakeup device for transmit. 139 */ 140 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 141 ifq_purge(&ifp->if_snd); 142 return; 143 } 144 /* 145 * No data frames go out unless we're running. 146 * Note in particular this covers CAC and CSA 147 * states (though maybe we should check muting 148 * for CSA). 149 */ 150 if (vap->iv_state != IEEE80211_S_RUN) { 151 IEEE80211_LOCK(ic); 152 /* re-check under the com lock to avoid races */ 153 if (vap->iv_state != IEEE80211_S_RUN) { 154 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 155 "%s: ignore queue, in %s state\n", 156 __func__, ieee80211_state_name[vap->iv_state]); 157 vap->iv_stats.is_tx_badstate++; 158 ifp->if_flags |= IFF_OACTIVE; 159 IEEE80211_UNLOCK(ic); 160 return; 161 } 162 IEEE80211_UNLOCK(ic); 163 } 164 for (;;) { 165 m = ifq_dequeue(&ifp->if_snd, NULL); 166 if (m == NULL) 167 break; 168 /* 169 * Sanitize mbuf flags for net80211 use. We cannot 170 * clear M_PWR_SAV or M_MORE_DATA because these may 171 * be set for frames that are re-submitted from the 172 * power save queue. 173 * 174 * NB: This must be done before ieee80211_classify as 175 * it marks EAPOL in frames with M_EAPOL. 176 */ 177 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 178 /* 179 * Cancel any background scan. 180 */ 181 if (ic->ic_flags & IEEE80211_F_SCAN) 182 ieee80211_cancel_anyscan(vap); 183 /* 184 * Find the node for the destination so we can do 185 * things like power save and fast frames aggregation. 186 * 187 * NB: past this point various code assumes the first 188 * mbuf has the 802.3 header present (and contiguous). 189 */ 190 ni = NULL; 191 if (m->m_len < sizeof(struct ether_header) && 192 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 193 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 194 "discard frame, %s\n", "m_pullup failed"); 195 vap->iv_stats.is_tx_nobuf++; /* XXX */ 196 ifp->if_oerrors++; 197 continue; 198 } 199 eh = mtod(m, struct ether_header *); 200 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 201 if (IS_DWDS(vap)) { 202 /* 203 * Only unicast frames from the above go out 204 * DWDS vaps; multicast frames are handled by 205 * dispatching the frame as it comes through 206 * the AP vap (see below). 207 */ 208 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 209 eh->ether_dhost, "mcast", "%s", "on DWDS"); 210 vap->iv_stats.is_dwds_mcast++; 211 m_freem(m); 212 continue; 213 } 214 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 215 /* 216 * Spam DWDS vap's w/ multicast traffic. 217 */ 218 /* XXX only if dwds in use? */ 219 ieee80211_dwds_mcast(vap, m); 220 } 221 } 222 #ifdef IEEE80211_SUPPORT_MESH 223 if (vap->iv_opmode != IEEE80211_M_MBSS) { 224 #endif 225 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 226 if (ni == NULL) { 227 /* NB: ieee80211_find_txnode does stat+msg */ 228 ifp->if_oerrors++; 229 m_freem(m); 230 continue; 231 } 232 if (ni->ni_associd == 0 && 233 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 234 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 235 eh->ether_dhost, NULL, 236 "sta not associated (type 0x%04x)", 237 htons(eh->ether_type)); 238 vap->iv_stats.is_tx_notassoc++; 239 ifp->if_oerrors++; 240 m_freem(m); 241 ieee80211_free_node(ni); 242 continue; 243 } 244 #ifdef IEEE80211_SUPPORT_MESH 245 } else { 246 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 247 /* 248 * Proxy station only if configured. 249 */ 250 if (!ieee80211_mesh_isproxyena(vap)) { 251 IEEE80211_DISCARD_MAC(vap, 252 IEEE80211_MSG_OUTPUT | 253 IEEE80211_MSG_MESH, 254 eh->ether_dhost, NULL, 255 "%s", "proxy not enabled"); 256 vap->iv_stats.is_mesh_notproxy++; 257 ifp->if_oerrors++; 258 m_freem(m); 259 continue; 260 } 261 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 262 } 263 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 264 if (ni == NULL) { 265 /* 266 * NB: ieee80211_mesh_discover holds/disposes 267 * frame (e.g. queueing on path discovery). 268 */ 269 ifp->if_oerrors++; 270 continue; 271 } 272 } 273 #endif 274 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 275 (m->m_flags & M_PWR_SAV) == 0) { 276 /* 277 * Station in power save mode; pass the frame 278 * to the 802.11 layer and continue. We'll get 279 * the frame back when the time is right. 280 * XXX lose WDS vap linkage? 281 */ 282 (void) ieee80211_pwrsave(ni, m); 283 ieee80211_free_node(ni); 284 continue; 285 } 286 /* calculate priority so drivers can find the tx queue */ 287 if (ieee80211_classify(ni, m)) { 288 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 289 eh->ether_dhost, NULL, 290 "%s", "classification failure"); 291 vap->iv_stats.is_tx_classify++; 292 ifp->if_oerrors++; 293 m_freem(m); 294 ieee80211_free_node(ni); 295 continue; 296 } 297 /* 298 * Stash the node pointer. Note that we do this after 299 * any call to ieee80211_dwds_mcast because that code 300 * uses any existing value for rcvif to identify the 301 * interface it (might have been) received on. 302 */ 303 m->m_pkthdr.rcvif = (void *)ni; 304 305 BPF_MTAP(ifp, m); /* 802.3 tx */ 306 307 /* 308 * Check if A-MPDU tx aggregation is setup or if we 309 * should try to enable it. The sta must be associated 310 * with HT and A-MPDU enabled for use. When the policy 311 * routine decides we should enable A-MPDU we issue an 312 * ADDBA request and wait for a reply. The frame being 313 * encapsulated will go out w/o using A-MPDU, or possibly 314 * it might be collected by the driver and held/retransmit. 315 * The default ic_ampdu_enable routine handles staggering 316 * ADDBA requests in case the receiver NAK's us or we are 317 * otherwise unable to establish a BA stream. 318 */ 319 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 320 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 321 (m->m_flags & M_EAPOL) == 0) { 322 const int ac = M_WME_GETAC(m); 323 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 324 325 ieee80211_txampdu_count_packet(tap); 326 if (IEEE80211_AMPDU_RUNNING(tap)) { 327 /* 328 * Operational, mark frame for aggregation. 329 * 330 * XXX do tx aggregation here 331 */ 332 m->m_flags |= M_AMPDU_MPDU; 333 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 334 ic->ic_ampdu_enable(ni, tap)) { 335 /* 336 * Not negotiated yet, request service. 337 */ 338 ieee80211_ampdu_request(ni, tap); 339 /* XXX hold frame for reply? */ 340 } 341 } 342 #ifdef IEEE80211_SUPPORT_SUPERG 343 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 344 m = ieee80211_ff_check(ni, m); 345 if (m == NULL) { 346 /* NB: any ni ref held on stageq */ 347 continue; 348 } 349 } 350 #endif /* IEEE80211_SUPPORT_SUPERG */ 351 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 352 /* 353 * Encapsulate the packet in prep for transmission. 354 */ 355 m = ieee80211_encap(vap, ni, m); 356 if (m == NULL) { 357 /* NB: stat+msg handled in ieee80211_encap */ 358 ieee80211_free_node(ni); 359 continue; 360 } 361 } 362 363 error = ieee80211_handoff(parent, m); 364 if (error != 0) { 365 /* NB: IFQ_HANDOFF reclaims mbuf */ 366 ieee80211_free_node(ni); 367 } else { 368 ifp->if_opackets++; 369 } 370 ic->ic_lastdata = ticks; 371 } 372 #undef IS_DWDS 373 } 374 375 376 /* 377 * 802.11 output routine. This is (currently) used only to 378 * connect bpf write calls to the 802.11 layer for injecting 379 * raw 802.11 frames. 380 */ 381 int 382 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 383 struct sockaddr *dst, struct rtentry *rt) 384 { 385 #define senderr(e) do { error = (e); goto bad;} while (0) 386 struct ieee80211_node *ni = NULL; 387 struct ieee80211vap *vap; 388 struct ieee80211_frame *wh; 389 int error; 390 391 if (ifp->if_flags & IFF_OACTIVE) { 392 /* 393 * Short-circuit requests if the vap is marked OACTIVE 394 * as this can happen because a packet came down through 395 * ieee80211_start before the vap entered RUN state in 396 * which case it's ok to just drop the frame. This 397 * should not be necessary but callers of if_output don't 398 * check OACTIVE. 399 */ 400 senderr(ENETDOWN); 401 } 402 vap = ifp->if_softc; 403 /* 404 * Hand to the 802.3 code if not tagged as 405 * a raw 802.11 frame. 406 */ 407 if (dst->sa_family != AF_IEEE80211) 408 return vap->iv_output(ifp, m, dst, rt); 409 #ifdef MAC 410 error = mac_ifnet_check_transmit(ifp, m); 411 if (error) 412 senderr(error); 413 #endif 414 if (ifp->if_flags & IFF_MONITOR) 415 senderr(ENETDOWN); 416 if (!IFNET_IS_UP_RUNNING(ifp)) 417 senderr(ENETDOWN); 418 if (vap->iv_state == IEEE80211_S_CAC) { 419 IEEE80211_DPRINTF(vap, 420 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 421 "block %s frame in CAC state\n", "raw data"); 422 vap->iv_stats.is_tx_badstate++; 423 senderr(EIO); /* XXX */ 424 } 425 /* XXX bypass bridge, pfil, carp, etc. */ 426 427 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 428 senderr(EIO); /* XXX */ 429 wh = mtod(m, struct ieee80211_frame *); 430 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 431 IEEE80211_FC0_VERSION_0) 432 senderr(EIO); /* XXX */ 433 434 /* locate destination node */ 435 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 436 case IEEE80211_FC1_DIR_NODS: 437 case IEEE80211_FC1_DIR_FROMDS: 438 ni = ieee80211_find_txnode(vap, wh->i_addr1); 439 break; 440 case IEEE80211_FC1_DIR_TODS: 441 case IEEE80211_FC1_DIR_DSTODS: 442 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 443 senderr(EIO); /* XXX */ 444 ni = ieee80211_find_txnode(vap, wh->i_addr3); 445 break; 446 default: 447 senderr(EIO); /* XXX */ 448 } 449 if (ni == NULL) { 450 /* 451 * Permit packets w/ bpf params through regardless 452 * (see below about sa_len). 453 */ 454 if (dst->sa_len == 0) 455 senderr(EHOSTUNREACH); 456 ni = ieee80211_ref_node(vap->iv_bss); 457 } 458 459 /* 460 * Sanitize mbuf for net80211 flags leaked from above. 461 * 462 * NB: This must be done before ieee80211_classify as 463 * it marks EAPOL in frames with M_EAPOL. 464 */ 465 m->m_flags &= ~M_80211_TX; 466 467 /* calculate priority so drivers can find the tx queue */ 468 /* XXX assumes an 802.3 frame */ 469 if (ieee80211_classify(ni, m)) 470 senderr(EIO); /* XXX */ 471 472 ifp->if_opackets++; 473 IEEE80211_NODE_STAT(ni, tx_data); 474 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 475 IEEE80211_NODE_STAT(ni, tx_mcast); 476 m->m_flags |= M_MCAST; 477 } else 478 IEEE80211_NODE_STAT(ni, tx_ucast); 479 /* NB: ieee80211_encap does not include 802.11 header */ 480 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 481 482 /* 483 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 484 * present by setting the sa_len field of the sockaddr (yes, 485 * this is a hack). 486 * NB: we assume sa_data is suitably aligned to cast. 487 */ 488 return vap->iv_ic->ic_raw_xmit(ni, m, 489 (const struct ieee80211_bpf_params *)(dst->sa_len ? 490 dst->sa_data : NULL)); 491 bad: 492 if (m != NULL) 493 m_freem(m); 494 if (ni != NULL) 495 ieee80211_free_node(ni); 496 ifp->if_oerrors++; 497 return error; 498 #undef senderr 499 } 500 501 /* 502 * Set the direction field and address fields of an outgoing 503 * frame. Note this should be called early on in constructing 504 * a frame as it sets i_fc[1]; other bits can then be or'd in. 505 */ 506 void 507 ieee80211_send_setup( 508 struct ieee80211_node *ni, 509 struct mbuf *m, 510 int type, int tid, 511 const uint8_t sa[IEEE80211_ADDR_LEN], 512 const uint8_t da[IEEE80211_ADDR_LEN], 513 const uint8_t bssid[IEEE80211_ADDR_LEN]) 514 { 515 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 516 struct ieee80211vap *vap = ni->ni_vap; 517 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 518 ieee80211_seq seqno; 519 520 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 521 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 522 switch (vap->iv_opmode) { 523 case IEEE80211_M_STA: 524 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 525 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 526 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 527 IEEE80211_ADDR_COPY(wh->i_addr3, da); 528 break; 529 case IEEE80211_M_IBSS: 530 case IEEE80211_M_AHDEMO: 531 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 532 IEEE80211_ADDR_COPY(wh->i_addr1, da); 533 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 534 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 535 break; 536 case IEEE80211_M_HOSTAP: 537 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 538 IEEE80211_ADDR_COPY(wh->i_addr1, da); 539 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 540 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 541 break; 542 case IEEE80211_M_WDS: 543 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 544 IEEE80211_ADDR_COPY(wh->i_addr1, da); 545 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 546 IEEE80211_ADDR_COPY(wh->i_addr3, da); 547 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 548 break; 549 case IEEE80211_M_MBSS: 550 #ifdef IEEE80211_SUPPORT_MESH 551 /* XXX add support for proxied addresses */ 552 if (IEEE80211_IS_MULTICAST(da)) { 553 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 554 /* XXX next hop */ 555 IEEE80211_ADDR_COPY(wh->i_addr1, da); 556 IEEE80211_ADDR_COPY(wh->i_addr2, 557 vap->iv_myaddr); 558 } else { 559 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 560 IEEE80211_ADDR_COPY(wh->i_addr1, da); 561 IEEE80211_ADDR_COPY(wh->i_addr2, 562 vap->iv_myaddr); 563 IEEE80211_ADDR_COPY(wh->i_addr3, da); 564 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 565 } 566 #endif 567 break; 568 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 569 break; 570 } 571 } else { 572 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 573 IEEE80211_ADDR_COPY(wh->i_addr1, da); 574 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 575 #ifdef IEEE80211_SUPPORT_MESH 576 if (vap->iv_opmode == IEEE80211_M_MBSS) 577 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 578 else 579 #endif 580 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 581 } 582 *(uint16_t *)&wh->i_dur[0] = 0; 583 584 seqno = ni->ni_txseqs[tid]++; 585 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 586 M_SEQNO_SET(m, seqno); 587 588 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 589 m->m_flags |= M_MCAST; 590 #undef WH4 591 } 592 593 /* 594 * Send a management frame to the specified node. The node pointer 595 * must have a reference as the pointer will be passed to the driver 596 * and potentially held for a long time. If the frame is successfully 597 * dispatched to the driver, then it is responsible for freeing the 598 * reference (and potentially free'ing up any associated storage); 599 * otherwise deal with reclaiming any reference (on error). 600 */ 601 int 602 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 603 struct ieee80211_bpf_params *params) 604 { 605 struct ieee80211vap *vap = ni->ni_vap; 606 struct ieee80211com *ic = ni->ni_ic; 607 struct ieee80211_frame *wh; 608 609 KASSERT(ni != NULL, ("null node")); 610 611 if (vap->iv_state == IEEE80211_S_CAC) { 612 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 613 ni, "block %s frame in CAC state", 614 ieee80211_mgt_subtype_name[ 615 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 616 IEEE80211_FC0_SUBTYPE_SHIFT]); 617 vap->iv_stats.is_tx_badstate++; 618 ieee80211_free_node(ni); 619 m_freem(m); 620 return EIO; /* XXX */ 621 } 622 623 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 624 if (m == NULL) { 625 ieee80211_free_node(ni); 626 return ENOMEM; 627 } 628 629 wh = mtod(m, struct ieee80211_frame *); 630 ieee80211_send_setup(ni, m, 631 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 632 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 633 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 634 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 635 "encrypting frame (%s)", __func__); 636 wh->i_fc[1] |= IEEE80211_FC1_WEP; 637 } 638 m->m_flags |= M_ENCAP; /* mark encapsulated */ 639 640 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 641 M_WME_SETAC(m, params->ibp_pri); 642 643 #ifdef IEEE80211_DEBUG 644 /* avoid printing too many frames */ 645 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 646 ieee80211_msg_dumppkts(vap)) { 647 kprintf("[%6D] send %s on channel %u\n", 648 wh->i_addr1, ":", 649 ieee80211_mgt_subtype_name[ 650 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 651 IEEE80211_FC0_SUBTYPE_SHIFT], 652 ieee80211_chan2ieee(ic, ic->ic_curchan)); 653 } 654 #endif 655 IEEE80211_NODE_STAT(ni, tx_mgmt); 656 657 return ic->ic_raw_xmit(ni, m, params); 658 } 659 660 /* 661 * Send a null data frame to the specified node. If the station 662 * is setup for QoS then a QoS Null Data frame is constructed. 663 * If this is a WDS station then a 4-address frame is constructed. 664 * 665 * NB: the caller is assumed to have setup a node reference 666 * for use; this is necessary to deal with a race condition 667 * when probing for inactive stations. Like ieee80211_mgmt_output 668 * we must cleanup any node reference on error; however we 669 * can safely just unref it as we know it will never be the 670 * last reference to the node. 671 */ 672 int 673 ieee80211_send_nulldata(struct ieee80211_node *ni) 674 { 675 struct ieee80211vap *vap = ni->ni_vap; 676 struct ieee80211com *ic = ni->ni_ic; 677 struct mbuf *m; 678 struct ieee80211_frame *wh; 679 int hdrlen; 680 uint8_t *frm; 681 682 if (vap->iv_state == IEEE80211_S_CAC) { 683 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 684 ni, "block %s frame in CAC state", "null data"); 685 ieee80211_unref_node(&ni); 686 vap->iv_stats.is_tx_badstate++; 687 return EIO; /* XXX */ 688 } 689 690 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 691 hdrlen = sizeof(struct ieee80211_qosframe); 692 else 693 hdrlen = sizeof(struct ieee80211_frame); 694 /* NB: only WDS vap's get 4-address frames */ 695 if (vap->iv_opmode == IEEE80211_M_WDS) 696 hdrlen += IEEE80211_ADDR_LEN; 697 if (ic->ic_flags & IEEE80211_F_DATAPAD) 698 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 699 700 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 701 if (m == NULL) { 702 /* XXX debug msg */ 703 ieee80211_unref_node(&ni); 704 vap->iv_stats.is_tx_nobuf++; 705 return ENOMEM; 706 } 707 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 708 ("leading space %zd", M_LEADINGSPACE(m))); 709 M_PREPEND(m, hdrlen, MB_DONTWAIT); 710 if (m == NULL) { 711 /* NB: cannot happen */ 712 ieee80211_free_node(ni); 713 return ENOMEM; 714 } 715 716 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 717 if (ni->ni_flags & IEEE80211_NODE_QOS) { 718 const int tid = WME_AC_TO_TID(WME_AC_BE); 719 uint8_t *qos; 720 721 ieee80211_send_setup(ni, m, 722 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 723 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 724 725 if (vap->iv_opmode == IEEE80211_M_WDS) 726 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 727 else 728 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 729 qos[0] = tid & IEEE80211_QOS_TID; 730 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 731 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 732 qos[1] = 0; 733 } else { 734 ieee80211_send_setup(ni, m, 735 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 736 IEEE80211_NONQOS_TID, 737 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 738 } 739 if (vap->iv_opmode != IEEE80211_M_WDS) { 740 /* NB: power management bit is never sent by an AP */ 741 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 742 vap->iv_opmode != IEEE80211_M_HOSTAP) 743 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 744 } 745 m->m_len = m->m_pkthdr.len = hdrlen; 746 m->m_flags |= M_ENCAP; /* mark encapsulated */ 747 748 M_WME_SETAC(m, WME_AC_BE); 749 750 IEEE80211_NODE_STAT(ni, tx_data); 751 752 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 753 "send %snull data frame on channel %u, pwr mgt %s", 754 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 755 ieee80211_chan2ieee(ic, ic->ic_curchan), 756 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 757 758 return ic->ic_raw_xmit(ni, m, NULL); 759 } 760 761 /* 762 * Assign priority to a frame based on any vlan tag assigned 763 * to the station and/or any Diffserv setting in an IP header. 764 * Finally, if an ACM policy is setup (in station mode) it's 765 * applied. 766 */ 767 int 768 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 769 { 770 const struct ether_header *eh = mtod(m, struct ether_header *); 771 int v_wme_ac, d_wme_ac, ac; 772 773 /* 774 * Always promote PAE/EAPOL frames to high priority. 775 */ 776 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 777 /* NB: mark so others don't need to check header */ 778 m->m_flags |= M_EAPOL; 779 ac = WME_AC_VO; 780 goto done; 781 } 782 /* 783 * Non-qos traffic goes to BE. 784 */ 785 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 786 ac = WME_AC_BE; 787 goto done; 788 } 789 790 /* 791 * If node has a vlan tag then all traffic 792 * to it must have a matching tag. 793 */ 794 v_wme_ac = 0; 795 if (ni->ni_vlan != 0) { 796 if ((m->m_flags & M_VLANTAG) == 0) { 797 IEEE80211_NODE_STAT(ni, tx_novlantag); 798 return 1; 799 } 800 #ifdef __FreeBSD__ 801 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 802 EVL_VLANOFTAG(ni->ni_vlan)) { 803 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 804 return 1; 805 } 806 /* map vlan priority to AC */ 807 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 808 #endif 809 } 810 811 /* XXX m_copydata may be too slow for fast path */ 812 #ifdef INET 813 if (eh->ether_type == htons(ETHERTYPE_IP)) { 814 uint8_t tos; 815 /* 816 * IP frame, map the DSCP bits from the TOS field. 817 */ 818 /* NB: ip header may not be in first mbuf */ 819 m_copydata(m, sizeof(struct ether_header) + 820 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 821 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 822 d_wme_ac = TID_TO_WME_AC(tos); 823 } else { 824 #endif /* INET */ 825 #ifdef INET6 826 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 827 uint32_t flow; 828 uint8_t tos; 829 /* 830 * IPv6 frame, map the DSCP bits from the TOS field. 831 */ 832 m_copydata(m, sizeof(struct ether_header) + 833 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 834 (caddr_t) &flow); 835 tos = (uint8_t)(ntohl(flow) >> 20); 836 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 837 d_wme_ac = TID_TO_WME_AC(tos); 838 } else { 839 #endif /* INET6 */ 840 d_wme_ac = WME_AC_BE; 841 #ifdef INET6 842 } 843 #endif 844 #ifdef INET 845 } 846 #endif 847 /* 848 * Use highest priority AC. 849 */ 850 if (v_wme_ac > d_wme_ac) 851 ac = v_wme_ac; 852 else 853 ac = d_wme_ac; 854 855 /* 856 * Apply ACM policy. 857 */ 858 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 859 static const int acmap[4] = { 860 WME_AC_BK, /* WME_AC_BE */ 861 WME_AC_BK, /* WME_AC_BK */ 862 WME_AC_BE, /* WME_AC_VI */ 863 WME_AC_VI, /* WME_AC_VO */ 864 }; 865 struct ieee80211com *ic = ni->ni_ic; 866 867 while (ac != WME_AC_BK && 868 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 869 ac = acmap[ac]; 870 } 871 done: 872 M_WME_SETAC(m, ac); 873 return 0; 874 } 875 876 /* 877 * Insure there is sufficient contiguous space to encapsulate the 878 * 802.11 data frame. If room isn't already there, arrange for it. 879 * Drivers and cipher modules assume we have done the necessary work 880 * and fail rudely if they don't find the space they need. 881 */ 882 struct mbuf * 883 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 884 struct ieee80211_key *key, struct mbuf *m) 885 { 886 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 887 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 888 889 if (key != NULL) { 890 /* XXX belongs in crypto code? */ 891 needed_space += key->wk_cipher->ic_header; 892 /* XXX frags */ 893 /* 894 * When crypto is being done in the host we must insure 895 * the data are writable for the cipher routines; clone 896 * a writable mbuf chain. 897 * XXX handle SWMIC specially 898 */ 899 #ifdef __FreeBSD__ 900 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 901 m = m_unshare(m, MB_DONTWAIT); 902 if (m == NULL) { 903 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 904 "%s: cannot get writable mbuf\n", __func__); 905 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 906 return NULL; 907 } 908 } 909 #endif 910 } 911 /* 912 * We know we are called just before stripping an Ethernet 913 * header and prepending an LLC header. This means we know 914 * there will be 915 * sizeof(struct ether_header) - sizeof(struct llc) 916 * bytes recovered to which we need additional space for the 917 * 802.11 header and any crypto header. 918 */ 919 /* XXX check trailing space and copy instead? */ 920 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 921 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type); 922 if (n == NULL) { 923 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 924 "%s: cannot expand storage\n", __func__); 925 vap->iv_stats.is_tx_nobuf++; 926 m_freem(m); 927 return NULL; 928 } 929 KASSERT(needed_space <= MHLEN, 930 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 931 /* 932 * Setup new mbuf to have leading space to prepend the 933 * 802.11 header and any crypto header bits that are 934 * required (the latter are added when the driver calls 935 * back to ieee80211_crypto_encap to do crypto encapsulation). 936 */ 937 /* NB: must be first 'cuz it clobbers m_data */ 938 m_move_pkthdr(n, m); 939 n->m_len = 0; /* NB: m_gethdr does not set */ 940 n->m_data += needed_space; 941 /* 942 * Pull up Ethernet header to create the expected layout. 943 * We could use m_pullup but that's overkill (i.e. we don't 944 * need the actual data) and it cannot fail so do it inline 945 * for speed. 946 */ 947 /* NB: struct ether_header is known to be contiguous */ 948 n->m_len += sizeof(struct ether_header); 949 m->m_len -= sizeof(struct ether_header); 950 m->m_data += sizeof(struct ether_header); 951 /* 952 * Replace the head of the chain. 953 */ 954 n->m_next = m; 955 m = n; 956 } 957 return m; 958 #undef TO_BE_RECLAIMED 959 } 960 961 /* 962 * Return the transmit key to use in sending a unicast frame. 963 * If a unicast key is set we use that. When no unicast key is set 964 * we fall back to the default transmit key. 965 */ 966 static __inline struct ieee80211_key * 967 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 968 struct ieee80211_node *ni) 969 { 970 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 971 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 972 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 973 return NULL; 974 return &vap->iv_nw_keys[vap->iv_def_txkey]; 975 } else { 976 return &ni->ni_ucastkey; 977 } 978 } 979 980 /* 981 * Return the transmit key to use in sending a multicast frame. 982 * Multicast traffic always uses the group key which is installed as 983 * the default tx key. 984 */ 985 static __inline struct ieee80211_key * 986 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 987 struct ieee80211_node *ni) 988 { 989 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 990 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 991 return NULL; 992 return &vap->iv_nw_keys[vap->iv_def_txkey]; 993 } 994 995 /* 996 * Encapsulate an outbound data frame. The mbuf chain is updated. 997 * If an error is encountered NULL is returned. The caller is required 998 * to provide a node reference and pullup the ethernet header in the 999 * first mbuf. 1000 * 1001 * NB: Packet is assumed to be processed by ieee80211_classify which 1002 * marked EAPOL frames w/ M_EAPOL. 1003 */ 1004 struct mbuf * 1005 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1006 struct mbuf *m) 1007 { 1008 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1009 struct ieee80211com *ic = ni->ni_ic; 1010 #ifdef IEEE80211_SUPPORT_MESH 1011 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1012 struct ieee80211_meshcntl_ae10 *mc; 1013 #endif 1014 struct ether_header eh; 1015 struct ieee80211_frame *wh; 1016 struct ieee80211_key *key; 1017 struct llc *llc; 1018 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1019 ieee80211_seq seqno; 1020 int meshhdrsize, meshae; 1021 uint8_t *qos; 1022 1023 /* 1024 * Copy existing Ethernet header to a safe place. The 1025 * rest of the code assumes it's ok to strip it when 1026 * reorganizing state for the final encapsulation. 1027 */ 1028 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1029 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1030 1031 /* 1032 * Insure space for additional headers. First identify 1033 * transmit key to use in calculating any buffer adjustments 1034 * required. This is also used below to do privacy 1035 * encapsulation work. Then calculate the 802.11 header 1036 * size and any padding required by the driver. 1037 * 1038 * Note key may be NULL if we fall back to the default 1039 * transmit key and that is not set. In that case the 1040 * buffer may not be expanded as needed by the cipher 1041 * routines, but they will/should discard it. 1042 */ 1043 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1044 if (vap->iv_opmode == IEEE80211_M_STA || 1045 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1046 (vap->iv_opmode == IEEE80211_M_WDS && 1047 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1048 key = ieee80211_crypto_getucastkey(vap, ni); 1049 else 1050 key = ieee80211_crypto_getmcastkey(vap, ni); 1051 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1052 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1053 eh.ether_dhost, 1054 "no default transmit key (%s) deftxkey %u", 1055 __func__, vap->iv_def_txkey); 1056 vap->iv_stats.is_tx_nodefkey++; 1057 goto bad; 1058 } 1059 } else 1060 key = NULL; 1061 /* 1062 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1063 * frames so suppress use. This may be an issue if other 1064 * ap's require all data frames to be QoS-encapsulated 1065 * once negotiated in which case we'll need to make this 1066 * configurable. 1067 */ 1068 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1069 (m->m_flags & M_EAPOL) == 0; 1070 if (addqos) 1071 hdrsize = sizeof(struct ieee80211_qosframe); 1072 else 1073 hdrsize = sizeof(struct ieee80211_frame); 1074 #ifdef IEEE80211_SUPPORT_MESH 1075 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1076 /* 1077 * Mesh data frames are encapsulated according to the 1078 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1079 * o Group Addressed data (aka multicast) originating 1080 * at the local sta are sent w/ 3-address format and 1081 * address extension mode 00 1082 * o Individually Addressed data (aka unicast) originating 1083 * at the local sta are sent w/ 4-address format and 1084 * address extension mode 00 1085 * o Group Addressed data forwarded from a non-mesh sta are 1086 * sent w/ 3-address format and address extension mode 01 1087 * o Individually Address data from another sta are sent 1088 * w/ 4-address format and address extension mode 10 1089 */ 1090 is4addr = 0; /* NB: don't use, disable */ 1091 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1092 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1093 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1094 /* XXX defines for AE modes */ 1095 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1096 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1097 meshae = 0; 1098 else 1099 meshae = 4; /* NB: pseudo */ 1100 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1101 meshae = 1; 1102 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1103 } else { 1104 meshae = 2; 1105 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1106 } 1107 } else { 1108 #endif 1109 /* 1110 * 4-address frames need to be generated for: 1111 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1112 * o packets sent through a vap marked for relaying 1113 * (e.g. a station operating with dynamic WDS) 1114 */ 1115 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1116 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1117 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1118 if (is4addr) 1119 hdrsize += IEEE80211_ADDR_LEN; 1120 meshhdrsize = meshae = 0; 1121 #ifdef IEEE80211_SUPPORT_MESH 1122 } 1123 #endif 1124 /* 1125 * Honor driver DATAPAD requirement. 1126 */ 1127 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1128 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1129 else 1130 hdrspace = hdrsize; 1131 1132 if (__predict_true((m->m_flags & M_FF) == 0)) { 1133 /* 1134 * Normal frame. 1135 */ 1136 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1137 if (m == NULL) { 1138 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1139 goto bad; 1140 } 1141 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1142 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1143 llc = mtod(m, struct llc *); 1144 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1145 llc->llc_control = LLC_UI; 1146 llc->llc_snap.org_code[0] = 0; 1147 llc->llc_snap.org_code[1] = 0; 1148 llc->llc_snap.org_code[2] = 0; 1149 llc->llc_snap.ether_type = eh.ether_type; 1150 } else { 1151 #ifdef IEEE80211_SUPPORT_SUPERG 1152 /* 1153 * Aggregated frame. 1154 */ 1155 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1156 if (m == NULL) 1157 #endif 1158 goto bad; 1159 } 1160 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1161 1162 M_PREPEND(m, hdrspace + meshhdrsize, MB_DONTWAIT); 1163 if (m == NULL) { 1164 vap->iv_stats.is_tx_nobuf++; 1165 goto bad; 1166 } 1167 wh = mtod(m, struct ieee80211_frame *); 1168 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1169 *(uint16_t *)wh->i_dur = 0; 1170 qos = NULL; /* NB: quiet compiler */ 1171 if (is4addr) { 1172 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1173 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1174 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1175 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1176 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1177 } else switch (vap->iv_opmode) { 1178 case IEEE80211_M_STA: 1179 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1180 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1181 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1182 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1183 break; 1184 case IEEE80211_M_IBSS: 1185 case IEEE80211_M_AHDEMO: 1186 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1187 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1188 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1189 /* 1190 * NB: always use the bssid from iv_bss as the 1191 * neighbor's may be stale after an ibss merge 1192 */ 1193 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1194 break; 1195 case IEEE80211_M_HOSTAP: 1196 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1197 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1198 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1199 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1200 break; 1201 #ifdef IEEE80211_SUPPORT_MESH 1202 case IEEE80211_M_MBSS: 1203 /* NB: offset by hdrspace to deal with DATAPAD */ 1204 mc = (struct ieee80211_meshcntl_ae10 *) 1205 (mtod(m, uint8_t *) + hdrspace); 1206 switch (meshae) { 1207 case 0: /* ucast, no proxy */ 1208 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1209 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1210 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1211 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1212 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1213 mc->mc_flags = 0; 1214 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1215 break; 1216 case 4: /* mcast, no proxy */ 1217 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1218 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1219 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1220 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1221 mc->mc_flags = 0; /* NB: AE is really 0 */ 1222 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1223 break; 1224 case 1: /* mcast, proxy */ 1225 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1226 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1227 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1228 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1229 mc->mc_flags = 1; 1230 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1231 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1232 break; 1233 case 2: /* ucast, proxy */ 1234 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1235 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1236 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1237 /* XXX not right, need MeshDA */ 1238 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1239 /* XXX assume are MeshSA */ 1240 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1241 mc->mc_flags = 2; 1242 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1243 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1244 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1245 break; 1246 default: 1247 KASSERT(0, ("meshae %d", meshae)); 1248 break; 1249 } 1250 mc->mc_ttl = ms->ms_ttl; 1251 ms->ms_seq++; 1252 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1253 break; 1254 #endif 1255 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1256 default: 1257 goto bad; 1258 } 1259 if (m->m_flags & M_MORE_DATA) 1260 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1261 if (addqos) { 1262 int ac, tid; 1263 1264 if (is4addr) { 1265 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1266 /* NB: mesh case handled earlier */ 1267 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1268 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1269 ac = M_WME_GETAC(m); 1270 /* map from access class/queue to 11e header priorty value */ 1271 tid = WME_AC_TO_TID(ac); 1272 qos[0] = tid & IEEE80211_QOS_TID; 1273 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1274 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1275 qos[1] = 0; 1276 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1277 1278 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1279 /* 1280 * NB: don't assign a sequence # to potential 1281 * aggregates; we expect this happens at the 1282 * point the frame comes off any aggregation q 1283 * as otherwise we may introduce holes in the 1284 * BA sequence space and/or make window accouting 1285 * more difficult. 1286 * 1287 * XXX may want to control this with a driver 1288 * capability; this may also change when we pull 1289 * aggregation up into net80211 1290 */ 1291 seqno = ni->ni_txseqs[tid]++; 1292 *(uint16_t *)wh->i_seq = 1293 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1294 M_SEQNO_SET(m, seqno); 1295 } 1296 } else { 1297 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1298 *(uint16_t *)wh->i_seq = 1299 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1300 M_SEQNO_SET(m, seqno); 1301 } 1302 1303 1304 /* check if xmit fragmentation is required */ 1305 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1306 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1307 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1308 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1309 if (key != NULL) { 1310 /* 1311 * IEEE 802.1X: send EAPOL frames always in the clear. 1312 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1313 */ 1314 if ((m->m_flags & M_EAPOL) == 0 || 1315 ((vap->iv_flags & IEEE80211_F_WPA) && 1316 (vap->iv_opmode == IEEE80211_M_STA ? 1317 !IEEE80211_KEY_UNDEFINED(key) : 1318 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1319 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1320 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1321 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1322 eh.ether_dhost, 1323 "%s", "enmic failed, discard frame"); 1324 vap->iv_stats.is_crypto_enmicfail++; 1325 goto bad; 1326 } 1327 } 1328 } 1329 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1330 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1331 goto bad; 1332 1333 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1334 1335 IEEE80211_NODE_STAT(ni, tx_data); 1336 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1337 IEEE80211_NODE_STAT(ni, tx_mcast); 1338 m->m_flags |= M_MCAST; 1339 } else 1340 IEEE80211_NODE_STAT(ni, tx_ucast); 1341 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1342 1343 return m; 1344 bad: 1345 if (m != NULL) 1346 m_freem(m); 1347 return NULL; 1348 #undef WH4 1349 } 1350 1351 /* 1352 * Fragment the frame according to the specified mtu. 1353 * The size of the 802.11 header (w/o padding) is provided 1354 * so we don't need to recalculate it. We create a new 1355 * mbuf for each fragment and chain it through m_nextpkt; 1356 * we might be able to optimize this by reusing the original 1357 * packet's mbufs but that is significantly more complicated. 1358 */ 1359 static int 1360 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1361 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1362 { 1363 struct ieee80211_frame *wh, *whf; 1364 struct mbuf *m, *prev, *next; 1365 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1366 1367 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1368 KASSERT(m0->m_pkthdr.len > mtu, 1369 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1370 1371 wh = mtod(m0, struct ieee80211_frame *); 1372 /* NB: mark the first frag; it will be propagated below */ 1373 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1374 totalhdrsize = hdrsize + ciphdrsize; 1375 fragno = 1; 1376 off = mtu - ciphdrsize; 1377 remainder = m0->m_pkthdr.len - off; 1378 prev = m0; 1379 do { 1380 fragsize = totalhdrsize + remainder; 1381 if (fragsize > mtu) 1382 fragsize = mtu; 1383 /* XXX fragsize can be >2048! */ 1384 KASSERT(fragsize < MCLBYTES, 1385 ("fragment size %u too big!", fragsize)); 1386 if (fragsize > MHLEN) 1387 m = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR); 1388 else 1389 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1390 if (m == NULL) 1391 goto bad; 1392 /* leave room to prepend any cipher header */ 1393 m_align(m, fragsize - ciphdrsize); 1394 1395 /* 1396 * Form the header in the fragment. Note that since 1397 * we mark the first fragment with the MORE_FRAG bit 1398 * it automatically is propagated to each fragment; we 1399 * need only clear it on the last fragment (done below). 1400 */ 1401 whf = mtod(m, struct ieee80211_frame *); 1402 memcpy(whf, wh, hdrsize); 1403 *(uint16_t *)&whf->i_seq[0] |= htole16( 1404 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1405 IEEE80211_SEQ_FRAG_SHIFT); 1406 fragno++; 1407 1408 payload = fragsize - totalhdrsize; 1409 /* NB: destination is known to be contiguous */ 1410 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1411 m->m_len = hdrsize + payload; 1412 m->m_pkthdr.len = hdrsize + payload; 1413 m->m_flags |= M_FRAG; 1414 1415 /* chain up the fragment */ 1416 prev->m_nextpkt = m; 1417 prev = m; 1418 1419 /* deduct fragment just formed */ 1420 remainder -= payload; 1421 off += payload; 1422 } while (remainder != 0); 1423 1424 /* set the last fragment */ 1425 m->m_flags |= M_LASTFRAG; 1426 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1427 1428 /* strip first mbuf now that everything has been copied */ 1429 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1430 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1431 1432 vap->iv_stats.is_tx_fragframes++; 1433 vap->iv_stats.is_tx_frags += fragno-1; 1434 1435 return 1; 1436 bad: 1437 /* reclaim fragments but leave original frame for caller to free */ 1438 for (m = m0->m_nextpkt; m != NULL; m = next) { 1439 next = m->m_nextpkt; 1440 m->m_nextpkt = NULL; /* XXX paranoid */ 1441 m_freem(m); 1442 } 1443 m0->m_nextpkt = NULL; 1444 return 0; 1445 } 1446 1447 /* 1448 * Add a supported rates element id to a frame. 1449 */ 1450 uint8_t * 1451 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1452 { 1453 int nrates; 1454 1455 *frm++ = IEEE80211_ELEMID_RATES; 1456 nrates = rs->rs_nrates; 1457 if (nrates > IEEE80211_RATE_SIZE) 1458 nrates = IEEE80211_RATE_SIZE; 1459 *frm++ = nrates; 1460 memcpy(frm, rs->rs_rates, nrates); 1461 return frm + nrates; 1462 } 1463 1464 /* 1465 * Add an extended supported rates element id to a frame. 1466 */ 1467 uint8_t * 1468 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1469 { 1470 /* 1471 * Add an extended supported rates element if operating in 11g mode. 1472 */ 1473 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1474 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1475 *frm++ = IEEE80211_ELEMID_XRATES; 1476 *frm++ = nrates; 1477 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1478 frm += nrates; 1479 } 1480 return frm; 1481 } 1482 1483 /* 1484 * Add an ssid element to a frame. 1485 */ 1486 static uint8_t * 1487 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1488 { 1489 *frm++ = IEEE80211_ELEMID_SSID; 1490 *frm++ = len; 1491 memcpy(frm, ssid, len); 1492 return frm + len; 1493 } 1494 1495 /* 1496 * Add an erp element to a frame. 1497 */ 1498 static uint8_t * 1499 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1500 { 1501 uint8_t erp; 1502 1503 *frm++ = IEEE80211_ELEMID_ERP; 1504 *frm++ = 1; 1505 erp = 0; 1506 if (ic->ic_nonerpsta != 0) 1507 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1508 if (ic->ic_flags & IEEE80211_F_USEPROT) 1509 erp |= IEEE80211_ERP_USE_PROTECTION; 1510 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1511 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1512 *frm++ = erp; 1513 return frm; 1514 } 1515 1516 /* 1517 * Add a CFParams element to a frame. 1518 */ 1519 static uint8_t * 1520 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1521 { 1522 #define ADDSHORT(frm, v) do { \ 1523 LE_WRITE_2(frm, v); \ 1524 frm += 2; \ 1525 } while (0) 1526 *frm++ = IEEE80211_ELEMID_CFPARMS; 1527 *frm++ = 6; 1528 *frm++ = 0; /* CFP count */ 1529 *frm++ = 2; /* CFP period */ 1530 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1531 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1532 return frm; 1533 #undef ADDSHORT 1534 } 1535 1536 static __inline uint8_t * 1537 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1538 { 1539 memcpy(frm, ie->ie_data, ie->ie_len); 1540 return frm + ie->ie_len; 1541 } 1542 1543 static __inline uint8_t * 1544 add_ie(uint8_t *frm, const uint8_t *ie) 1545 { 1546 memcpy(frm, ie, 2 + ie[1]); 1547 return frm + 2 + ie[1]; 1548 } 1549 1550 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1551 /* 1552 * Add a WME information element to a frame. 1553 */ 1554 static uint8_t * 1555 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1556 { 1557 static const struct ieee80211_wme_info info = { 1558 .wme_id = IEEE80211_ELEMID_VENDOR, 1559 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1560 .wme_oui = { WME_OUI_BYTES }, 1561 .wme_type = WME_OUI_TYPE, 1562 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1563 .wme_version = WME_VERSION, 1564 .wme_info = 0, 1565 }; 1566 memcpy(frm, &info, sizeof(info)); 1567 return frm + sizeof(info); 1568 } 1569 1570 /* 1571 * Add a WME parameters element to a frame. 1572 */ 1573 static uint8_t * 1574 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1575 { 1576 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1577 #define ADDSHORT(frm, v) do { \ 1578 LE_WRITE_2(frm, v); \ 1579 frm += 2; \ 1580 } while (0) 1581 /* NB: this works 'cuz a param has an info at the front */ 1582 static const struct ieee80211_wme_info param = { 1583 .wme_id = IEEE80211_ELEMID_VENDOR, 1584 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1585 .wme_oui = { WME_OUI_BYTES }, 1586 .wme_type = WME_OUI_TYPE, 1587 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1588 .wme_version = WME_VERSION, 1589 }; 1590 int i; 1591 1592 memcpy(frm, ¶m, sizeof(param)); 1593 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1594 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1595 *frm++ = 0; /* reserved field */ 1596 for (i = 0; i < WME_NUM_AC; i++) { 1597 const struct wmeParams *ac = 1598 &wme->wme_bssChanParams.cap_wmeParams[i]; 1599 *frm++ = SM(i, WME_PARAM_ACI) 1600 | SM(ac->wmep_acm, WME_PARAM_ACM) 1601 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1602 ; 1603 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1604 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1605 ; 1606 ADDSHORT(frm, ac->wmep_txopLimit); 1607 } 1608 return frm; 1609 #undef SM 1610 #undef ADDSHORT 1611 } 1612 #undef WME_OUI_BYTES 1613 1614 /* 1615 * Add an 11h Power Constraint element to a frame. 1616 */ 1617 static uint8_t * 1618 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1619 { 1620 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1621 /* XXX per-vap tx power limit? */ 1622 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1623 1624 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1625 frm[1] = 1; 1626 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1627 return frm + 3; 1628 } 1629 1630 /* 1631 * Add an 11h Power Capability element to a frame. 1632 */ 1633 static uint8_t * 1634 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1635 { 1636 frm[0] = IEEE80211_ELEMID_PWRCAP; 1637 frm[1] = 2; 1638 frm[2] = c->ic_minpower; 1639 frm[3] = c->ic_maxpower; 1640 return frm + 4; 1641 } 1642 1643 /* 1644 * Add an 11h Supported Channels element to a frame. 1645 */ 1646 static uint8_t * 1647 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1648 { 1649 static const int ielen = 26; 1650 1651 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1652 frm[1] = ielen; 1653 /* XXX not correct */ 1654 memcpy(frm+2, ic->ic_chan_avail, ielen); 1655 return frm + 2 + ielen; 1656 } 1657 1658 /* 1659 * Add an 11h Channel Switch Announcement element to a frame. 1660 * Note that we use the per-vap CSA count to adjust the global 1661 * counter so we can use this routine to form probe response 1662 * frames and get the current count. 1663 */ 1664 static uint8_t * 1665 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1666 { 1667 struct ieee80211com *ic = vap->iv_ic; 1668 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1669 1670 csa->csa_ie = IEEE80211_ELEMID_CSA; 1671 csa->csa_len = 3; 1672 csa->csa_mode = 1; /* XXX force quiet on channel */ 1673 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1674 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1675 return frm + sizeof(*csa); 1676 } 1677 1678 /* 1679 * Add an 11h country information element to a frame. 1680 */ 1681 static uint8_t * 1682 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1683 { 1684 1685 if (ic->ic_countryie == NULL || 1686 ic->ic_countryie_chan != ic->ic_bsschan) { 1687 /* 1688 * Handle lazy construction of ie. This is done on 1689 * first use and after a channel change that requires 1690 * re-calculation. 1691 */ 1692 if (ic->ic_countryie != NULL) 1693 kfree(ic->ic_countryie, M_80211_NODE_IE); 1694 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1695 if (ic->ic_countryie == NULL) 1696 return frm; 1697 ic->ic_countryie_chan = ic->ic_bsschan; 1698 } 1699 return add_appie(frm, ic->ic_countryie); 1700 } 1701 1702 /* 1703 * Send a probe request frame with the specified ssid 1704 * and any optional information element data. 1705 */ 1706 int 1707 ieee80211_send_probereq(struct ieee80211_node *ni, 1708 const uint8_t sa[IEEE80211_ADDR_LEN], 1709 const uint8_t da[IEEE80211_ADDR_LEN], 1710 const uint8_t bssid[IEEE80211_ADDR_LEN], 1711 const uint8_t *ssid, size_t ssidlen) 1712 { 1713 struct ieee80211vap *vap = ni->ni_vap; 1714 struct ieee80211com *ic = ni->ni_ic; 1715 const struct ieee80211_txparam *tp; 1716 struct ieee80211_bpf_params params; 1717 struct ieee80211_frame *wh; 1718 const struct ieee80211_rateset *rs; 1719 struct mbuf *m; 1720 uint8_t *frm; 1721 1722 if (vap->iv_state == IEEE80211_S_CAC) { 1723 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1724 "block %s frame in CAC state", "probe request"); 1725 vap->iv_stats.is_tx_badstate++; 1726 return EIO; /* XXX */ 1727 } 1728 1729 /* 1730 * Hold a reference on the node so it doesn't go away until after 1731 * the xmit is complete all the way in the driver. On error we 1732 * will remove our reference. 1733 */ 1734 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1735 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1736 __func__, __LINE__, 1737 ni, ni->ni_macaddr, ":", 1738 ieee80211_node_refcnt(ni)+1); 1739 ieee80211_ref_node(ni); 1740 1741 /* 1742 * prreq frame format 1743 * [tlv] ssid 1744 * [tlv] supported rates 1745 * [tlv] RSN (optional) 1746 * [tlv] extended supported rates 1747 * [tlv] WPA (optional) 1748 * [tlv] user-specified ie's 1749 */ 1750 m = ieee80211_getmgtframe(&frm, 1751 ic->ic_headroom + sizeof(struct ieee80211_frame), 1752 2 + IEEE80211_NWID_LEN 1753 + 2 + IEEE80211_RATE_SIZE 1754 + sizeof(struct ieee80211_ie_wpa) 1755 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1756 + sizeof(struct ieee80211_ie_wpa) 1757 + (vap->iv_appie_probereq != NULL ? 1758 vap->iv_appie_probereq->ie_len : 0) 1759 ); 1760 if (m == NULL) { 1761 vap->iv_stats.is_tx_nobuf++; 1762 ieee80211_free_node(ni); 1763 return ENOMEM; 1764 } 1765 1766 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1767 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1768 frm = ieee80211_add_rates(frm, rs); 1769 if (vap->iv_flags & IEEE80211_F_WPA2) { 1770 if (vap->iv_rsn_ie != NULL) 1771 frm = add_ie(frm, vap->iv_rsn_ie); 1772 /* XXX else complain? */ 1773 } 1774 frm = ieee80211_add_xrates(frm, rs); 1775 if (vap->iv_flags & IEEE80211_F_WPA1) { 1776 if (vap->iv_wpa_ie != NULL) 1777 frm = add_ie(frm, vap->iv_wpa_ie); 1778 /* XXX else complain? */ 1779 } 1780 if (vap->iv_appie_probereq != NULL) 1781 frm = add_appie(frm, vap->iv_appie_probereq); 1782 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1783 1784 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1785 ("leading space %zd", M_LEADINGSPACE(m))); 1786 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1787 if (m == NULL) { 1788 /* NB: cannot happen */ 1789 ieee80211_free_node(ni); 1790 return ENOMEM; 1791 } 1792 1793 wh = mtod(m, struct ieee80211_frame *); 1794 ieee80211_send_setup(ni, m, 1795 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1796 IEEE80211_NONQOS_TID, sa, da, bssid); 1797 /* XXX power management? */ 1798 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1799 1800 M_WME_SETAC(m, WME_AC_BE); 1801 1802 IEEE80211_NODE_STAT(ni, tx_probereq); 1803 IEEE80211_NODE_STAT(ni, tx_mgmt); 1804 1805 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1806 "send probe req on channel %u bssid %6D ssid \"%.*s\"\n", 1807 ieee80211_chan2ieee(ic, ic->ic_curchan), bssid, ":", 1808 ssidlen, ssid); 1809 1810 memset(¶ms, 0, sizeof(params)); 1811 params.ibp_pri = M_WME_GETAC(m); 1812 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1813 params.ibp_rate0 = tp->mgmtrate; 1814 if (IEEE80211_IS_MULTICAST(da)) { 1815 params.ibp_flags |= IEEE80211_BPF_NOACK; 1816 params.ibp_try0 = 1; 1817 } else 1818 params.ibp_try0 = tp->maxretry; 1819 params.ibp_power = ni->ni_txpower; 1820 return ic->ic_raw_xmit(ni, m, ¶ms); 1821 } 1822 1823 /* 1824 * Calculate capability information for mgt frames. 1825 */ 1826 uint16_t 1827 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1828 { 1829 struct ieee80211com *ic = vap->iv_ic; 1830 uint16_t capinfo; 1831 1832 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1833 1834 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1835 capinfo = IEEE80211_CAPINFO_ESS; 1836 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1837 capinfo = IEEE80211_CAPINFO_IBSS; 1838 else 1839 capinfo = 0; 1840 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1841 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1842 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1843 IEEE80211_IS_CHAN_2GHZ(chan)) 1844 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1845 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1846 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1847 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1848 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1849 return capinfo; 1850 } 1851 1852 /* 1853 * Send a management frame. The node is for the destination (or ic_bss 1854 * when in station mode). Nodes other than ic_bss have their reference 1855 * count bumped to reflect our use for an indeterminant time. 1856 */ 1857 int 1858 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1859 { 1860 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1861 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1862 struct ieee80211vap *vap = ni->ni_vap; 1863 struct ieee80211com *ic = ni->ni_ic; 1864 struct ieee80211_node *bss = vap->iv_bss; 1865 struct ieee80211_bpf_params params; 1866 struct mbuf *m; 1867 uint8_t *frm; 1868 uint16_t capinfo; 1869 int has_challenge, is_shared_key, ret, status; 1870 1871 KASSERT(ni != NULL, ("null node")); 1872 1873 /* 1874 * Hold a reference on the node so it doesn't go away until after 1875 * the xmit is complete all the way in the driver. On error we 1876 * will remove our reference. 1877 */ 1878 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1879 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1880 __func__, __LINE__, 1881 ni, ni->ni_macaddr, ":", 1882 ieee80211_node_refcnt(ni)+1); 1883 ieee80211_ref_node(ni); 1884 1885 memset(¶ms, 0, sizeof(params)); 1886 switch (type) { 1887 1888 case IEEE80211_FC0_SUBTYPE_AUTH: 1889 status = arg >> 16; 1890 arg &= 0xffff; 1891 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1892 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1893 ni->ni_challenge != NULL); 1894 1895 /* 1896 * Deduce whether we're doing open authentication or 1897 * shared key authentication. We do the latter if 1898 * we're in the middle of a shared key authentication 1899 * handshake or if we're initiating an authentication 1900 * request and configured to use shared key. 1901 */ 1902 is_shared_key = has_challenge || 1903 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1904 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1905 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1906 1907 m = ieee80211_getmgtframe(&frm, 1908 ic->ic_headroom + sizeof(struct ieee80211_frame), 1909 3 * sizeof(uint16_t) 1910 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1911 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1912 ); 1913 if (m == NULL) 1914 senderr(ENOMEM, is_tx_nobuf); 1915 1916 ((uint16_t *)frm)[0] = 1917 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1918 : htole16(IEEE80211_AUTH_ALG_OPEN); 1919 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1920 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1921 1922 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1923 ((uint16_t *)frm)[3] = 1924 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1925 IEEE80211_ELEMID_CHALLENGE); 1926 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1927 IEEE80211_CHALLENGE_LEN); 1928 m->m_pkthdr.len = m->m_len = 1929 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1930 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1931 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1932 "request encrypt frame (%s)", __func__); 1933 /* mark frame for encryption */ 1934 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1935 } 1936 } else 1937 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1938 1939 /* XXX not right for shared key */ 1940 if (status == IEEE80211_STATUS_SUCCESS) 1941 IEEE80211_NODE_STAT(ni, tx_auth); 1942 else 1943 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1944 1945 if (vap->iv_opmode == IEEE80211_M_STA) 1946 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1947 (void *) vap->iv_state); 1948 break; 1949 1950 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1951 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1952 "send station deauthenticate (reason %d)", arg); 1953 m = ieee80211_getmgtframe(&frm, 1954 ic->ic_headroom + sizeof(struct ieee80211_frame), 1955 sizeof(uint16_t)); 1956 if (m == NULL) 1957 senderr(ENOMEM, is_tx_nobuf); 1958 *(uint16_t *)frm = htole16(arg); /* reason */ 1959 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1960 1961 IEEE80211_NODE_STAT(ni, tx_deauth); 1962 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1963 1964 ieee80211_node_unauthorize(ni); /* port closed */ 1965 break; 1966 1967 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1968 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1969 /* 1970 * asreq frame format 1971 * [2] capability information 1972 * [2] listen interval 1973 * [6*] current AP address (reassoc only) 1974 * [tlv] ssid 1975 * [tlv] supported rates 1976 * [tlv] extended supported rates 1977 * [4] power capability (optional) 1978 * [28] supported channels (optional) 1979 * [tlv] HT capabilities 1980 * [tlv] WME (optional) 1981 * [tlv] Vendor OUI HT capabilities (optional) 1982 * [tlv] Atheros capabilities (if negotiated) 1983 * [tlv] AppIE's (optional) 1984 */ 1985 m = ieee80211_getmgtframe(&frm, 1986 ic->ic_headroom + sizeof(struct ieee80211_frame), 1987 sizeof(uint16_t) 1988 + sizeof(uint16_t) 1989 + IEEE80211_ADDR_LEN 1990 + 2 + IEEE80211_NWID_LEN 1991 + 2 + IEEE80211_RATE_SIZE 1992 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1993 + 4 1994 + 2 + 26 1995 + sizeof(struct ieee80211_wme_info) 1996 + sizeof(struct ieee80211_ie_htcap) 1997 + 4 + sizeof(struct ieee80211_ie_htcap) 1998 #ifdef IEEE80211_SUPPORT_SUPERG 1999 + sizeof(struct ieee80211_ath_ie) 2000 #endif 2001 + (vap->iv_appie_wpa != NULL ? 2002 vap->iv_appie_wpa->ie_len : 0) 2003 + (vap->iv_appie_assocreq != NULL ? 2004 vap->iv_appie_assocreq->ie_len : 0) 2005 ); 2006 if (m == NULL) 2007 senderr(ENOMEM, is_tx_nobuf); 2008 2009 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2010 ("wrong mode %u", vap->iv_opmode)); 2011 capinfo = IEEE80211_CAPINFO_ESS; 2012 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2013 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2014 /* 2015 * NB: Some 11a AP's reject the request when 2016 * short premable is set. 2017 */ 2018 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2019 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2020 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2021 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2022 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2023 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2024 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2025 (vap->iv_flags & IEEE80211_F_DOTH)) 2026 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2027 *(uint16_t *)frm = htole16(capinfo); 2028 frm += 2; 2029 2030 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2031 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2032 bss->ni_intval)); 2033 frm += 2; 2034 2035 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2036 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2037 frm += IEEE80211_ADDR_LEN; 2038 } 2039 2040 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2041 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2042 if (vap->iv_flags & IEEE80211_F_WPA2) { 2043 if (vap->iv_rsn_ie != NULL) 2044 frm = add_ie(frm, vap->iv_rsn_ie); 2045 /* XXX else complain? */ 2046 } 2047 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2048 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2049 frm = ieee80211_add_powercapability(frm, 2050 ic->ic_curchan); 2051 frm = ieee80211_add_supportedchannels(frm, ic); 2052 } 2053 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2054 ni->ni_ies.htcap_ie != NULL && 2055 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2056 frm = ieee80211_add_htcap(frm, ni); 2057 if (vap->iv_flags & IEEE80211_F_WPA1) { 2058 if (vap->iv_wpa_ie != NULL) 2059 frm = add_ie(frm, vap->iv_wpa_ie); 2060 /* XXX else complain */ 2061 } 2062 if ((ic->ic_flags & IEEE80211_F_WME) && 2063 ni->ni_ies.wme_ie != NULL) 2064 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2065 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2066 ni->ni_ies.htcap_ie != NULL && 2067 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2068 frm = ieee80211_add_htcap_vendor(frm, ni); 2069 #ifdef IEEE80211_SUPPORT_SUPERG 2070 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2071 frm = ieee80211_add_ath(frm, 2072 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2073 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2074 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2075 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2076 } 2077 #endif /* IEEE80211_SUPPORT_SUPERG */ 2078 if (vap->iv_appie_assocreq != NULL) 2079 frm = add_appie(frm, vap->iv_appie_assocreq); 2080 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2081 2082 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2083 (void *) vap->iv_state); 2084 break; 2085 2086 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2087 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2088 /* 2089 * asresp frame format 2090 * [2] capability information 2091 * [2] status 2092 * [2] association ID 2093 * [tlv] supported rates 2094 * [tlv] extended supported rates 2095 * [tlv] HT capabilities (standard, if STA enabled) 2096 * [tlv] HT information (standard, if STA enabled) 2097 * [tlv] WME (if configured and STA enabled) 2098 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2099 * [tlv] HT information (vendor OUI, if STA enabled) 2100 * [tlv] Atheros capabilities (if STA enabled) 2101 * [tlv] AppIE's (optional) 2102 */ 2103 m = ieee80211_getmgtframe(&frm, 2104 ic->ic_headroom + sizeof(struct ieee80211_frame), 2105 sizeof(uint16_t) 2106 + sizeof(uint16_t) 2107 + sizeof(uint16_t) 2108 + 2 + IEEE80211_RATE_SIZE 2109 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2110 + sizeof(struct ieee80211_ie_htcap) + 4 2111 + sizeof(struct ieee80211_ie_htinfo) + 4 2112 + sizeof(struct ieee80211_wme_param) 2113 #ifdef IEEE80211_SUPPORT_SUPERG 2114 + sizeof(struct ieee80211_ath_ie) 2115 #endif 2116 + (vap->iv_appie_assocresp != NULL ? 2117 vap->iv_appie_assocresp->ie_len : 0) 2118 ); 2119 if (m == NULL) 2120 senderr(ENOMEM, is_tx_nobuf); 2121 2122 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2123 *(uint16_t *)frm = htole16(capinfo); 2124 frm += 2; 2125 2126 *(uint16_t *)frm = htole16(arg); /* status */ 2127 frm += 2; 2128 2129 if (arg == IEEE80211_STATUS_SUCCESS) { 2130 *(uint16_t *)frm = htole16(ni->ni_associd); 2131 IEEE80211_NODE_STAT(ni, tx_assoc); 2132 } else 2133 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2134 frm += 2; 2135 2136 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2137 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2138 /* NB: respond according to what we received */ 2139 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2140 frm = ieee80211_add_htcap(frm, ni); 2141 frm = ieee80211_add_htinfo(frm, ni); 2142 } 2143 if ((vap->iv_flags & IEEE80211_F_WME) && 2144 ni->ni_ies.wme_ie != NULL) 2145 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2146 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2147 frm = ieee80211_add_htcap_vendor(frm, ni); 2148 frm = ieee80211_add_htinfo_vendor(frm, ni); 2149 } 2150 #ifdef IEEE80211_SUPPORT_SUPERG 2151 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2152 frm = ieee80211_add_ath(frm, 2153 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2154 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2155 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2156 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2157 #endif /* IEEE80211_SUPPORT_SUPERG */ 2158 if (vap->iv_appie_assocresp != NULL) 2159 frm = add_appie(frm, vap->iv_appie_assocresp); 2160 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2161 break; 2162 2163 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2164 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2165 "send station disassociate (reason %d)", arg); 2166 m = ieee80211_getmgtframe(&frm, 2167 ic->ic_headroom + sizeof(struct ieee80211_frame), 2168 sizeof(uint16_t)); 2169 if (m == NULL) 2170 senderr(ENOMEM, is_tx_nobuf); 2171 *(uint16_t *)frm = htole16(arg); /* reason */ 2172 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2173 2174 IEEE80211_NODE_STAT(ni, tx_disassoc); 2175 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2176 break; 2177 2178 default: 2179 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2180 "invalid mgmt frame type %u", type); 2181 senderr(EINVAL, is_tx_unknownmgt); 2182 /* NOTREACHED */ 2183 } 2184 2185 /* NB: force non-ProbeResp frames to the highest queue */ 2186 params.ibp_pri = WME_AC_VO; 2187 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2188 /* NB: we know all frames are unicast */ 2189 params.ibp_try0 = bss->ni_txparms->maxretry; 2190 params.ibp_power = bss->ni_txpower; 2191 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2192 bad: 2193 ieee80211_free_node(ni); 2194 return ret; 2195 #undef senderr 2196 #undef HTFLAGS 2197 } 2198 2199 /* 2200 * Return an mbuf with a probe response frame in it. 2201 * Space is left to prepend and 802.11 header at the 2202 * front but it's left to the caller to fill in. 2203 */ 2204 struct mbuf * 2205 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2206 { 2207 struct ieee80211vap *vap = bss->ni_vap; 2208 struct ieee80211com *ic = bss->ni_ic; 2209 const struct ieee80211_rateset *rs; 2210 struct mbuf *m; 2211 uint16_t capinfo; 2212 uint8_t *frm; 2213 2214 /* 2215 * probe response frame format 2216 * [8] time stamp 2217 * [2] beacon interval 2218 * [2] cabability information 2219 * [tlv] ssid 2220 * [tlv] supported rates 2221 * [tlv] parameter set (FH/DS) 2222 * [tlv] parameter set (IBSS) 2223 * [tlv] country (optional) 2224 * [3] power control (optional) 2225 * [5] channel switch announcement (CSA) (optional) 2226 * [tlv] extended rate phy (ERP) 2227 * [tlv] extended supported rates 2228 * [tlv] RSN (optional) 2229 * [tlv] HT capabilities 2230 * [tlv] HT information 2231 * [tlv] WPA (optional) 2232 * [tlv] WME (optional) 2233 * [tlv] Vendor OUI HT capabilities (optional) 2234 * [tlv] Vendor OUI HT information (optional) 2235 * [tlv] Atheros capabilities 2236 * [tlv] AppIE's (optional) 2237 * [tlv] Mesh ID (MBSS) 2238 * [tlv] Mesh Conf (MBSS) 2239 */ 2240 m = ieee80211_getmgtframe(&frm, 2241 ic->ic_headroom + sizeof(struct ieee80211_frame), 2242 8 2243 + sizeof(uint16_t) 2244 + sizeof(uint16_t) 2245 + 2 + IEEE80211_NWID_LEN 2246 + 2 + IEEE80211_RATE_SIZE 2247 + 7 /* max(7,3) */ 2248 + IEEE80211_COUNTRY_MAX_SIZE 2249 + 3 2250 + sizeof(struct ieee80211_csa_ie) 2251 + 3 2252 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2253 + sizeof(struct ieee80211_ie_wpa) 2254 + sizeof(struct ieee80211_ie_htcap) 2255 + sizeof(struct ieee80211_ie_htinfo) 2256 + sizeof(struct ieee80211_ie_wpa) 2257 + sizeof(struct ieee80211_wme_param) 2258 + 4 + sizeof(struct ieee80211_ie_htcap) 2259 + 4 + sizeof(struct ieee80211_ie_htinfo) 2260 #ifdef IEEE80211_SUPPORT_SUPERG 2261 + sizeof(struct ieee80211_ath_ie) 2262 #endif 2263 #ifdef IEEE80211_SUPPORT_MESH 2264 + 2 + IEEE80211_MESHID_LEN 2265 + sizeof(struct ieee80211_meshconf_ie) 2266 #endif 2267 + (vap->iv_appie_proberesp != NULL ? 2268 vap->iv_appie_proberesp->ie_len : 0) 2269 ); 2270 if (m == NULL) { 2271 vap->iv_stats.is_tx_nobuf++; 2272 return NULL; 2273 } 2274 2275 memset(frm, 0, 8); /* timestamp should be filled later */ 2276 frm += 8; 2277 *(uint16_t *)frm = htole16(bss->ni_intval); 2278 frm += 2; 2279 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2280 *(uint16_t *)frm = htole16(capinfo); 2281 frm += 2; 2282 2283 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2284 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2285 frm = ieee80211_add_rates(frm, rs); 2286 2287 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2288 *frm++ = IEEE80211_ELEMID_FHPARMS; 2289 *frm++ = 5; 2290 *frm++ = bss->ni_fhdwell & 0x00ff; 2291 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2292 *frm++ = IEEE80211_FH_CHANSET( 2293 ieee80211_chan2ieee(ic, bss->ni_chan)); 2294 *frm++ = IEEE80211_FH_CHANPAT( 2295 ieee80211_chan2ieee(ic, bss->ni_chan)); 2296 *frm++ = bss->ni_fhindex; 2297 } else { 2298 *frm++ = IEEE80211_ELEMID_DSPARMS; 2299 *frm++ = 1; 2300 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2301 } 2302 2303 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2304 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2305 *frm++ = 2; 2306 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2307 } 2308 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2309 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2310 frm = ieee80211_add_countryie(frm, ic); 2311 if (vap->iv_flags & IEEE80211_F_DOTH) { 2312 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2313 frm = ieee80211_add_powerconstraint(frm, vap); 2314 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2315 frm = ieee80211_add_csa(frm, vap); 2316 } 2317 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2318 frm = ieee80211_add_erp(frm, ic); 2319 frm = ieee80211_add_xrates(frm, rs); 2320 if (vap->iv_flags & IEEE80211_F_WPA2) { 2321 if (vap->iv_rsn_ie != NULL) 2322 frm = add_ie(frm, vap->iv_rsn_ie); 2323 /* XXX else complain? */ 2324 } 2325 /* 2326 * NB: legacy 11b clients do not get certain ie's. 2327 * The caller identifies such clients by passing 2328 * a token in legacy to us. Could expand this to be 2329 * any legacy client for stuff like HT ie's. 2330 */ 2331 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2332 legacy != IEEE80211_SEND_LEGACY_11B) { 2333 frm = ieee80211_add_htcap(frm, bss); 2334 frm = ieee80211_add_htinfo(frm, bss); 2335 } 2336 if (vap->iv_flags & IEEE80211_F_WPA1) { 2337 if (vap->iv_wpa_ie != NULL) 2338 frm = add_ie(frm, vap->iv_wpa_ie); 2339 /* XXX else complain? */ 2340 } 2341 if (vap->iv_flags & IEEE80211_F_WME) 2342 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2343 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2344 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2345 legacy != IEEE80211_SEND_LEGACY_11B) { 2346 frm = ieee80211_add_htcap_vendor(frm, bss); 2347 frm = ieee80211_add_htinfo_vendor(frm, bss); 2348 } 2349 #ifdef IEEE80211_SUPPORT_SUPERG 2350 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2351 legacy != IEEE80211_SEND_LEGACY_11B) 2352 frm = ieee80211_add_athcaps(frm, bss); 2353 #endif 2354 if (vap->iv_appie_proberesp != NULL) 2355 frm = add_appie(frm, vap->iv_appie_proberesp); 2356 #ifdef IEEE80211_SUPPORT_MESH 2357 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2358 frm = ieee80211_add_meshid(frm, vap); 2359 frm = ieee80211_add_meshconf(frm, vap); 2360 } 2361 #endif 2362 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2363 2364 return m; 2365 } 2366 2367 /* 2368 * Send a probe response frame to the specified mac address. 2369 * This does not go through the normal mgt frame api so we 2370 * can specify the destination address and re-use the bss node 2371 * for the sta reference. 2372 */ 2373 int 2374 ieee80211_send_proberesp(struct ieee80211vap *vap, 2375 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2376 { 2377 struct ieee80211_node *bss = vap->iv_bss; 2378 struct ieee80211com *ic = vap->iv_ic; 2379 struct ieee80211_frame *wh; 2380 struct mbuf *m; 2381 2382 if (vap->iv_state == IEEE80211_S_CAC) { 2383 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2384 "block %s frame in CAC state", "probe response"); 2385 vap->iv_stats.is_tx_badstate++; 2386 return EIO; /* XXX */ 2387 } 2388 2389 /* 2390 * Hold a reference on the node so it doesn't go away until after 2391 * the xmit is complete all the way in the driver. On error we 2392 * will remove our reference. 2393 */ 2394 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2395 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 2396 __func__, __LINE__, bss, bss->ni_macaddr, ":", 2397 ieee80211_node_refcnt(bss)+1); 2398 ieee80211_ref_node(bss); 2399 2400 m = ieee80211_alloc_proberesp(bss, legacy); 2401 if (m == NULL) { 2402 ieee80211_free_node(bss); 2403 return ENOMEM; 2404 } 2405 2406 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2407 KASSERT(m != NULL, ("no room for header")); 2408 2409 wh = mtod(m, struct ieee80211_frame *); 2410 ieee80211_send_setup(bss, m, 2411 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2412 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2413 /* XXX power management? */ 2414 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2415 2416 M_WME_SETAC(m, WME_AC_BE); 2417 2418 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2419 "send probe resp on channel %u to %6D%s\n", 2420 ieee80211_chan2ieee(ic, ic->ic_curchan), da, ":", 2421 legacy ? " <legacy>" : ""); 2422 IEEE80211_NODE_STAT(bss, tx_mgmt); 2423 2424 return ic->ic_raw_xmit(bss, m, NULL); 2425 } 2426 2427 /* 2428 * Allocate and build a RTS (Request To Send) control frame. 2429 */ 2430 struct mbuf * 2431 ieee80211_alloc_rts(struct ieee80211com *ic, 2432 const uint8_t ra[IEEE80211_ADDR_LEN], 2433 const uint8_t ta[IEEE80211_ADDR_LEN], 2434 uint16_t dur) 2435 { 2436 struct ieee80211_frame_rts *rts; 2437 struct mbuf *m; 2438 2439 /* XXX honor ic_headroom */ 2440 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2441 if (m != NULL) { 2442 rts = mtod(m, struct ieee80211_frame_rts *); 2443 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2444 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2445 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2446 *(u_int16_t *)rts->i_dur = htole16(dur); 2447 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2448 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2449 2450 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2451 } 2452 return m; 2453 } 2454 2455 /* 2456 * Allocate and build a CTS (Clear To Send) control frame. 2457 */ 2458 struct mbuf * 2459 ieee80211_alloc_cts(struct ieee80211com *ic, 2460 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2461 { 2462 struct ieee80211_frame_cts *cts; 2463 struct mbuf *m; 2464 2465 /* XXX honor ic_headroom */ 2466 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2467 if (m != NULL) { 2468 cts = mtod(m, struct ieee80211_frame_cts *); 2469 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2470 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2471 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2472 *(u_int16_t *)cts->i_dur = htole16(dur); 2473 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2474 2475 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2476 } 2477 return m; 2478 } 2479 2480 static void 2481 ieee80211_tx_mgt_timeout(void *arg) 2482 { 2483 struct ieee80211_node *ni = arg; 2484 struct ieee80211vap *vap = ni->ni_vap; 2485 2486 if (vap->iv_state != IEEE80211_S_INIT && 2487 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2488 /* 2489 * NB: it's safe to specify a timeout as the reason here; 2490 * it'll only be used in the right state. 2491 */ 2492 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2493 IEEE80211_SCAN_FAIL_TIMEOUT); 2494 } 2495 } 2496 2497 static void 2498 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2499 { 2500 struct ieee80211vap *vap = ni->ni_vap; 2501 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2502 2503 /* 2504 * Frame transmit completed; arrange timer callback. If 2505 * transmit was successfuly we wait for response. Otherwise 2506 * we arrange an immediate callback instead of doing the 2507 * callback directly since we don't know what state the driver 2508 * is in (e.g. what locks it is holding). This work should 2509 * not be too time-critical and not happen too often so the 2510 * added overhead is acceptable. 2511 * 2512 * XXX what happens if !acked but response shows up before callback? 2513 */ 2514 if (vap->iv_state == ostate) 2515 callout_reset(&vap->iv_mgtsend, 2516 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2517 ieee80211_tx_mgt_timeout, ni); 2518 } 2519 2520 static void 2521 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2522 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2523 { 2524 struct ieee80211vap *vap = ni->ni_vap; 2525 struct ieee80211com *ic = ni->ni_ic; 2526 struct ieee80211_rateset *rs = &ni->ni_rates; 2527 uint16_t capinfo; 2528 2529 /* 2530 * beacon frame format 2531 * [8] time stamp 2532 * [2] beacon interval 2533 * [2] cabability information 2534 * [tlv] ssid 2535 * [tlv] supported rates 2536 * [3] parameter set (DS) 2537 * [8] CF parameter set (optional) 2538 * [tlv] parameter set (IBSS/TIM) 2539 * [tlv] country (optional) 2540 * [3] power control (optional) 2541 * [5] channel switch announcement (CSA) (optional) 2542 * [tlv] extended rate phy (ERP) 2543 * [tlv] extended supported rates 2544 * [tlv] RSN parameters 2545 * [tlv] HT capabilities 2546 * [tlv] HT information 2547 * XXX Vendor-specific OIDs (e.g. Atheros) 2548 * [tlv] WPA parameters 2549 * [tlv] WME parameters 2550 * [tlv] Vendor OUI HT capabilities (optional) 2551 * [tlv] Vendor OUI HT information (optional) 2552 * [tlv] Atheros capabilities (optional) 2553 * [tlv] TDMA parameters (optional) 2554 * [tlv] Mesh ID (MBSS) 2555 * [tlv] Mesh Conf (MBSS) 2556 * [tlv] application data (optional) 2557 */ 2558 2559 memset(bo, 0, sizeof(*bo)); 2560 2561 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2562 frm += 8; 2563 *(uint16_t *)frm = htole16(ni->ni_intval); 2564 frm += 2; 2565 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2566 bo->bo_caps = (uint16_t *)frm; 2567 *(uint16_t *)frm = htole16(capinfo); 2568 frm += 2; 2569 *frm++ = IEEE80211_ELEMID_SSID; 2570 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2571 *frm++ = ni->ni_esslen; 2572 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2573 frm += ni->ni_esslen; 2574 } else 2575 *frm++ = 0; 2576 frm = ieee80211_add_rates(frm, rs); 2577 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2578 *frm++ = IEEE80211_ELEMID_DSPARMS; 2579 *frm++ = 1; 2580 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2581 } 2582 if (ic->ic_flags & IEEE80211_F_PCF) { 2583 bo->bo_cfp = frm; 2584 frm = ieee80211_add_cfparms(frm, ic); 2585 } 2586 bo->bo_tim = frm; 2587 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2588 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2589 *frm++ = 2; 2590 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2591 bo->bo_tim_len = 0; 2592 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2593 vap->iv_opmode == IEEE80211_M_MBSS) { 2594 /* TIM IE is the same for Mesh and Hostap */ 2595 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2596 2597 tie->tim_ie = IEEE80211_ELEMID_TIM; 2598 tie->tim_len = 4; /* length */ 2599 tie->tim_count = 0; /* DTIM count */ 2600 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2601 tie->tim_bitctl = 0; /* bitmap control */ 2602 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2603 frm += sizeof(struct ieee80211_tim_ie); 2604 bo->bo_tim_len = 1; 2605 } 2606 bo->bo_tim_trailer = frm; 2607 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2608 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2609 frm = ieee80211_add_countryie(frm, ic); 2610 if (vap->iv_flags & IEEE80211_F_DOTH) { 2611 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2612 frm = ieee80211_add_powerconstraint(frm, vap); 2613 bo->bo_csa = frm; 2614 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2615 frm = ieee80211_add_csa(frm, vap); 2616 } else 2617 bo->bo_csa = frm; 2618 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2619 bo->bo_erp = frm; 2620 frm = ieee80211_add_erp(frm, ic); 2621 } 2622 frm = ieee80211_add_xrates(frm, rs); 2623 if (vap->iv_flags & IEEE80211_F_WPA2) { 2624 if (vap->iv_rsn_ie != NULL) 2625 frm = add_ie(frm, vap->iv_rsn_ie); 2626 /* XXX else complain */ 2627 } 2628 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2629 frm = ieee80211_add_htcap(frm, ni); 2630 bo->bo_htinfo = frm; 2631 frm = ieee80211_add_htinfo(frm, ni); 2632 } 2633 if (vap->iv_flags & IEEE80211_F_WPA1) { 2634 if (vap->iv_wpa_ie != NULL) 2635 frm = add_ie(frm, vap->iv_wpa_ie); 2636 /* XXX else complain */ 2637 } 2638 if (vap->iv_flags & IEEE80211_F_WME) { 2639 bo->bo_wme = frm; 2640 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2641 } 2642 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2643 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2644 frm = ieee80211_add_htcap_vendor(frm, ni); 2645 frm = ieee80211_add_htinfo_vendor(frm, ni); 2646 } 2647 #ifdef IEEE80211_SUPPORT_SUPERG 2648 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2649 bo->bo_ath = frm; 2650 frm = ieee80211_add_athcaps(frm, ni); 2651 } 2652 #endif 2653 #ifdef IEEE80211_SUPPORT_TDMA 2654 if (vap->iv_caps & IEEE80211_C_TDMA) { 2655 bo->bo_tdma = frm; 2656 frm = ieee80211_add_tdma(frm, vap); 2657 } 2658 #endif 2659 if (vap->iv_appie_beacon != NULL) { 2660 bo->bo_appie = frm; 2661 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2662 frm = add_appie(frm, vap->iv_appie_beacon); 2663 } 2664 #ifdef IEEE80211_SUPPORT_MESH 2665 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2666 frm = ieee80211_add_meshid(frm, vap); 2667 bo->bo_meshconf = frm; 2668 frm = ieee80211_add_meshconf(frm, vap); 2669 } 2670 #endif 2671 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2672 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2673 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2674 } 2675 2676 /* 2677 * Allocate a beacon frame and fillin the appropriate bits. 2678 */ 2679 struct mbuf * 2680 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2681 struct ieee80211_beacon_offsets *bo) 2682 { 2683 struct ieee80211vap *vap = ni->ni_vap; 2684 struct ieee80211com *ic = ni->ni_ic; 2685 struct ifnet *ifp = vap->iv_ifp; 2686 struct ieee80211_frame *wh; 2687 struct mbuf *m; 2688 int pktlen; 2689 uint8_t *frm; 2690 2691 /* 2692 * beacon frame format 2693 * [8] time stamp 2694 * [2] beacon interval 2695 * [2] cabability information 2696 * [tlv] ssid 2697 * [tlv] supported rates 2698 * [3] parameter set (DS) 2699 * [8] CF parameter set (optional) 2700 * [tlv] parameter set (IBSS/TIM) 2701 * [tlv] country (optional) 2702 * [3] power control (optional) 2703 * [5] channel switch announcement (CSA) (optional) 2704 * [tlv] extended rate phy (ERP) 2705 * [tlv] extended supported rates 2706 * [tlv] RSN parameters 2707 * [tlv] HT capabilities 2708 * [tlv] HT information 2709 * [tlv] Vendor OUI HT capabilities (optional) 2710 * [tlv] Vendor OUI HT information (optional) 2711 * XXX Vendor-specific OIDs (e.g. Atheros) 2712 * [tlv] WPA parameters 2713 * [tlv] WME parameters 2714 * [tlv] TDMA parameters (optional) 2715 * [tlv] Mesh ID (MBSS) 2716 * [tlv] Mesh Conf (MBSS) 2717 * [tlv] application data (optional) 2718 * NB: we allocate the max space required for the TIM bitmap. 2719 * XXX how big is this? 2720 */ 2721 pktlen = 8 /* time stamp */ 2722 + sizeof(uint16_t) /* beacon interval */ 2723 + sizeof(uint16_t) /* capabilities */ 2724 + 2 + ni->ni_esslen /* ssid */ 2725 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2726 + 2 + 1 /* DS parameters */ 2727 + 2 + 6 /* CF parameters */ 2728 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2729 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2730 + 2 + 1 /* power control */ 2731 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2732 + 2 + 1 /* ERP */ 2733 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2734 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2735 2*sizeof(struct ieee80211_ie_wpa) : 0) 2736 /* XXX conditional? */ 2737 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2738 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2739 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2740 sizeof(struct ieee80211_wme_param) : 0) 2741 #ifdef IEEE80211_SUPPORT_SUPERG 2742 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2743 #endif 2744 #ifdef IEEE80211_SUPPORT_TDMA 2745 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2746 sizeof(struct ieee80211_tdma_param) : 0) 2747 #endif 2748 #ifdef IEEE80211_SUPPORT_MESH 2749 + 2 + ni->ni_meshidlen 2750 + sizeof(struct ieee80211_meshconf_ie) 2751 #endif 2752 + IEEE80211_MAX_APPIE 2753 ; 2754 m = ieee80211_getmgtframe(&frm, 2755 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2756 if (m == NULL) { 2757 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2758 "%s: cannot get buf; size %u\n", __func__, pktlen); 2759 vap->iv_stats.is_tx_nobuf++; 2760 return NULL; 2761 } 2762 ieee80211_beacon_construct(m, frm, bo, ni); 2763 2764 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2765 KASSERT(m != NULL, ("no space for 802.11 header?")); 2766 wh = mtod(m, struct ieee80211_frame *); 2767 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2768 IEEE80211_FC0_SUBTYPE_BEACON; 2769 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2770 *(uint16_t *)wh->i_dur = 0; 2771 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2772 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2773 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2774 *(uint16_t *)wh->i_seq = 0; 2775 2776 return m; 2777 } 2778 2779 /* 2780 * Update the dynamic parts of a beacon frame based on the current state. 2781 */ 2782 int 2783 ieee80211_beacon_update(struct ieee80211_node *ni, 2784 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2785 { 2786 struct ieee80211vap *vap = ni->ni_vap; 2787 struct ieee80211com *ic = ni->ni_ic; 2788 int len_changed = 0; 2789 uint16_t capinfo; 2790 2791 IEEE80211_LOCK(ic); 2792 /* 2793 * Handle 11h channel change when we've reached the count. 2794 * We must recalculate the beacon frame contents to account 2795 * for the new channel. Note we do this only for the first 2796 * vap that reaches this point; subsequent vaps just update 2797 * their beacon state to reflect the recalculated channel. 2798 */ 2799 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2800 vap->iv_csa_count == ic->ic_csa_count) { 2801 vap->iv_csa_count = 0; 2802 /* 2803 * Effect channel change before reconstructing the beacon 2804 * frame contents as many places reference ni_chan. 2805 */ 2806 if (ic->ic_csa_newchan != NULL) 2807 ieee80211_csa_completeswitch(ic); 2808 /* 2809 * NB: ieee80211_beacon_construct clears all pending 2810 * updates in bo_flags so we don't need to explicitly 2811 * clear IEEE80211_BEACON_CSA. 2812 */ 2813 ieee80211_beacon_construct(m, 2814 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2815 2816 /* XXX do WME aggressive mode processing? */ 2817 IEEE80211_UNLOCK(ic); 2818 return 1; /* just assume length changed */ 2819 } 2820 2821 /* XXX faster to recalculate entirely or just changes? */ 2822 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2823 *bo->bo_caps = htole16(capinfo); 2824 2825 if (vap->iv_flags & IEEE80211_F_WME) { 2826 struct ieee80211_wme_state *wme = &ic->ic_wme; 2827 2828 /* 2829 * Check for agressive mode change. When there is 2830 * significant high priority traffic in the BSS 2831 * throttle back BE traffic by using conservative 2832 * parameters. Otherwise BE uses agressive params 2833 * to optimize performance of legacy/non-QoS traffic. 2834 */ 2835 if (wme->wme_flags & WME_F_AGGRMODE) { 2836 if (wme->wme_hipri_traffic > 2837 wme->wme_hipri_switch_thresh) { 2838 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2839 "%s: traffic %u, disable aggressive mode\n", 2840 __func__, wme->wme_hipri_traffic); 2841 wme->wme_flags &= ~WME_F_AGGRMODE; 2842 ieee80211_wme_updateparams_locked(vap); 2843 wme->wme_hipri_traffic = 2844 wme->wme_hipri_switch_hysteresis; 2845 } else 2846 wme->wme_hipri_traffic = 0; 2847 } else { 2848 if (wme->wme_hipri_traffic <= 2849 wme->wme_hipri_switch_thresh) { 2850 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2851 "%s: traffic %u, enable aggressive mode\n", 2852 __func__, wme->wme_hipri_traffic); 2853 wme->wme_flags |= WME_F_AGGRMODE; 2854 ieee80211_wme_updateparams_locked(vap); 2855 wme->wme_hipri_traffic = 0; 2856 } else 2857 wme->wme_hipri_traffic = 2858 wme->wme_hipri_switch_hysteresis; 2859 } 2860 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2861 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2862 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2863 } 2864 } 2865 2866 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2867 ieee80211_ht_update_beacon(vap, bo); 2868 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2869 } 2870 #ifdef IEEE80211_SUPPORT_TDMA 2871 if (vap->iv_caps & IEEE80211_C_TDMA) { 2872 /* 2873 * NB: the beacon is potentially updated every TBTT. 2874 */ 2875 ieee80211_tdma_update_beacon(vap, bo); 2876 } 2877 #endif 2878 #ifdef IEEE80211_SUPPORT_MESH 2879 if (vap->iv_opmode == IEEE80211_M_MBSS) 2880 ieee80211_mesh_update_beacon(vap, bo); 2881 #endif 2882 2883 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2884 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2885 struct ieee80211_tim_ie *tie = 2886 (struct ieee80211_tim_ie *) bo->bo_tim; 2887 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2888 u_int timlen, timoff, i; 2889 /* 2890 * ATIM/DTIM needs updating. If it fits in the 2891 * current space allocated then just copy in the 2892 * new bits. Otherwise we need to move any trailing 2893 * data to make room. Note that we know there is 2894 * contiguous space because ieee80211_beacon_allocate 2895 * insures there is space in the mbuf to write a 2896 * maximal-size virtual bitmap (based on iv_max_aid). 2897 */ 2898 /* 2899 * Calculate the bitmap size and offset, copy any 2900 * trailer out of the way, and then copy in the 2901 * new bitmap and update the information element. 2902 * Note that the tim bitmap must contain at least 2903 * one byte and any offset must be even. 2904 */ 2905 if (vap->iv_ps_pending != 0) { 2906 timoff = 128; /* impossibly large */ 2907 for (i = 0; i < vap->iv_tim_len; i++) 2908 if (vap->iv_tim_bitmap[i]) { 2909 timoff = i &~ 1; 2910 break; 2911 } 2912 KASSERT(timoff != 128, ("tim bitmap empty!")); 2913 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2914 if (vap->iv_tim_bitmap[i]) 2915 break; 2916 timlen = 1 + (i - timoff); 2917 } else { 2918 timoff = 0; 2919 timlen = 1; 2920 } 2921 if (timlen != bo->bo_tim_len) { 2922 /* copy up/down trailer */ 2923 int adjust = tie->tim_bitmap+timlen 2924 - bo->bo_tim_trailer; 2925 ovbcopy(bo->bo_tim_trailer, 2926 bo->bo_tim_trailer+adjust, 2927 bo->bo_tim_trailer_len); 2928 bo->bo_tim_trailer += adjust; 2929 bo->bo_erp += adjust; 2930 bo->bo_htinfo += adjust; 2931 #ifdef IEEE80211_SUPERG_SUPPORT 2932 bo->bo_ath += adjust; 2933 #endif 2934 #ifdef IEEE80211_TDMA_SUPPORT 2935 bo->bo_tdma += adjust; 2936 #endif 2937 #ifdef IEEE80211_MESH_SUPPORT 2938 bo->bo_meshconf += adjust; 2939 #endif 2940 bo->bo_appie += adjust; 2941 bo->bo_wme += adjust; 2942 bo->bo_csa += adjust; 2943 bo->bo_tim_len = timlen; 2944 2945 /* update information element */ 2946 tie->tim_len = 3 + timlen; 2947 tie->tim_bitctl = timoff; 2948 len_changed = 1; 2949 } 2950 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2951 bo->bo_tim_len); 2952 2953 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2954 2955 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2956 "%s: TIM updated, pending %u, off %u, len %u\n", 2957 __func__, vap->iv_ps_pending, timoff, timlen); 2958 } 2959 /* count down DTIM period */ 2960 if (tie->tim_count == 0) 2961 tie->tim_count = tie->tim_period - 1; 2962 else 2963 tie->tim_count--; 2964 /* update state for buffered multicast frames on DTIM */ 2965 if (mcast && tie->tim_count == 0) 2966 tie->tim_bitctl |= 1; 2967 else 2968 tie->tim_bitctl &= ~1; 2969 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2970 struct ieee80211_csa_ie *csa = 2971 (struct ieee80211_csa_ie *) bo->bo_csa; 2972 2973 /* 2974 * Insert or update CSA ie. If we're just starting 2975 * to count down to the channel switch then we need 2976 * to insert the CSA ie. Otherwise we just need to 2977 * drop the count. The actual change happens above 2978 * when the vap's count reaches the target count. 2979 */ 2980 if (vap->iv_csa_count == 0) { 2981 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2982 bo->bo_erp += sizeof(*csa); 2983 bo->bo_htinfo += sizeof(*csa); 2984 bo->bo_wme += sizeof(*csa); 2985 #ifdef IEEE80211_SUPERG_SUPPORT 2986 bo->bo_ath += sizeof(*csa); 2987 #endif 2988 #ifdef IEEE80211_TDMA_SUPPORT 2989 bo->bo_tdma += sizeof(*csa); 2990 #endif 2991 #ifdef IEEE80211_MESH_SUPPORT 2992 bo->bo_meshconf += sizeof(*csa); 2993 #endif 2994 bo->bo_appie += sizeof(*csa); 2995 bo->bo_csa_trailer_len += sizeof(*csa); 2996 bo->bo_tim_trailer_len += sizeof(*csa); 2997 m->m_len += sizeof(*csa); 2998 m->m_pkthdr.len += sizeof(*csa); 2999 3000 ieee80211_add_csa(bo->bo_csa, vap); 3001 } else 3002 csa->csa_count--; 3003 vap->iv_csa_count++; 3004 /* NB: don't clear IEEE80211_BEACON_CSA */ 3005 } 3006 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3007 /* 3008 * ERP element needs updating. 3009 */ 3010 (void) ieee80211_add_erp(bo->bo_erp, ic); 3011 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3012 } 3013 #ifdef IEEE80211_SUPPORT_SUPERG 3014 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3015 ieee80211_add_athcaps(bo->bo_ath, ni); 3016 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3017 } 3018 #endif 3019 } 3020 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3021 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3022 int aielen; 3023 uint8_t *frm; 3024 3025 aielen = 0; 3026 if (aie != NULL) 3027 aielen += aie->ie_len; 3028 if (aielen != bo->bo_appie_len) { 3029 /* copy up/down trailer */ 3030 int adjust = aielen - bo->bo_appie_len; 3031 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3032 bo->bo_tim_trailer_len); 3033 bo->bo_tim_trailer += adjust; 3034 bo->bo_appie += adjust; 3035 bo->bo_appie_len = aielen; 3036 3037 len_changed = 1; 3038 } 3039 frm = bo->bo_appie; 3040 if (aie != NULL) 3041 frm = add_appie(frm, aie); 3042 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3043 } 3044 IEEE80211_UNLOCK(ic); 3045 3046 return len_changed; 3047 } 3048