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 */ 28 29 #include "opt_inet.h" 30 #include "opt_inet6.h" 31 #include "opt_wlan.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/mbuf.h> 36 #include <sys/kernel.h> 37 #include <sys/endian.h> 38 39 #include <sys/socket.h> 40 41 #include <net/bpf.h> 42 #include <net/ethernet.h> 43 #include <net/route.h> 44 #include <net/if.h> 45 #include <net/if_llc.h> 46 #include <net/if_media.h> 47 #include <net/ifq_var.h> 48 49 #include <netproto/802_11/ieee80211_var.h> 50 #include <netproto/802_11/ieee80211_regdomain.h> 51 #ifdef IEEE80211_SUPPORT_SUPERG 52 #include <netproto/802_11/ieee80211_superg.h> 53 #endif 54 #ifdef IEEE80211_SUPPORT_TDMA 55 #include <netproto/802_11/ieee80211_tdma.h> 56 #endif 57 #include <netproto/802_11/ieee80211_wds.h> 58 #include <netproto/802_11/ieee80211_mesh.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/if_ether.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #endif 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif 69 70 #define ETHER_HEADER_COPY(dst, src) \ 71 memcpy(dst, src, sizeof(struct ether_header)) 72 73 /* unalligned little endian access */ 74 #define LE_WRITE_2(p, v) do { \ 75 ((uint8_t *)(p))[0] = (v) & 0xff; \ 76 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 77 } while (0) 78 #define LE_WRITE_4(p, v) do { \ 79 ((uint8_t *)(p))[0] = (v) & 0xff; \ 80 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 81 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 82 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 83 } while (0) 84 85 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 86 u_int hdrsize, u_int ciphdrsize, u_int mtu); 87 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 88 89 #ifdef IEEE80211_DEBUG 90 /* 91 * Decide if an outbound management frame should be 92 * printed when debugging is enabled. This filters some 93 * of the less interesting frames that come frequently 94 * (e.g. beacons). 95 */ 96 static __inline int 97 doprint(struct ieee80211vap *vap, int subtype) 98 { 99 switch (subtype) { 100 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 101 return (vap->iv_opmode == IEEE80211_M_IBSS); 102 } 103 return 1; 104 } 105 #endif 106 107 /* 108 * Start method for vap's. All packets from the stack come 109 * through here. We handle common processing of the packets 110 * before dispatching them to the underlying device. 111 */ 112 void 113 ieee80211_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 114 { 115 #define IS_DWDS(vap) \ 116 (vap->iv_opmode == IEEE80211_M_WDS && \ 117 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 118 struct ieee80211vap *vap = ifp->if_softc; 119 struct ieee80211com *ic = vap->iv_ic; 120 struct ifnet *parent = ic->ic_ifp; 121 struct ieee80211_node *ni; 122 struct mbuf *m = NULL; 123 struct ether_header *eh; 124 int error; 125 126 wlan_assert_serialized(); 127 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 128 129 /* NB: parent must be up and running */ 130 if (!IFNET_IS_UP_RUNNING(parent)) { 131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 132 "%s: ignore queue, parent %s not up+running\n", 133 __func__, parent->if_xname); 134 /* XXX stat */ 135 ifsq_purge(ifsq); 136 return; 137 } 138 if (vap->iv_state == IEEE80211_S_SLEEP) { 139 /* 140 * In power save, wakeup device for transmit. 141 */ 142 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 143 ifsq_purge(ifsq); 144 return; 145 } 146 /* 147 * No data frames go out unless we're running. 148 * Note in particular this covers CAC and CSA 149 * states (though maybe we should check muting 150 * for CSA). 151 */ 152 if (vap->iv_state != IEEE80211_S_RUN) { 153 /* re-check under the com lock to avoid races */ 154 if (vap->iv_state != IEEE80211_S_RUN) { 155 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 156 "%s: ignore queue, in %s state\n", 157 __func__, ieee80211_state_name[vap->iv_state]); 158 vap->iv_stats.is_tx_badstate++; 159 ifsq_set_oactive(ifsq); 160 return; 161 } 162 } 163 for (;;) { 164 m = ifsq_dequeue(ifsq, NULL); 165 if (m == NULL) 166 break; 167 /* 168 * Sanitize mbuf flags for net80211 use. We cannot 169 * clear M_PWR_SAV or M_MORE_DATA because these may 170 * be set for frames that are re-submitted from the 171 * power save queue. 172 * 173 * NB: This must be done before ieee80211_classify as 174 * it marks EAPOL in frames with M_EAPOL. 175 */ 176 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 177 /* 178 * Cancel any background scan. 179 */ 180 if (ic->ic_flags & IEEE80211_F_SCAN) 181 ieee80211_cancel_anyscan(vap); 182 /* 183 * Find the node for the destination so we can do 184 * things like power save and fast frames aggregation. 185 * 186 * NB: past this point various code assumes the first 187 * mbuf has the 802.3 header present (and contiguous). 188 */ 189 ni = NULL; 190 if (m->m_len < sizeof(struct ether_header) && 191 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 192 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 193 "discard frame, %s\n", "m_pullup failed"); 194 vap->iv_stats.is_tx_nobuf++; /* XXX */ 195 IFNET_STAT_INC(ifp, oerrors, 1); 196 continue; 197 } 198 eh = mtod(m, struct ether_header *); 199 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 200 if (IS_DWDS(vap)) { 201 /* 202 * Only unicast frames from the above go out 203 * DWDS vaps; multicast frames are handled by 204 * dispatching the frame as it comes through 205 * the AP vap (see below). 206 */ 207 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 208 eh->ether_dhost, "mcast", "%s", "on DWDS"); 209 vap->iv_stats.is_dwds_mcast++; 210 m_freem(m); 211 continue; 212 } 213 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 214 /* 215 * Spam DWDS vap's w/ multicast traffic. 216 */ 217 /* XXX only if dwds in use? */ 218 ieee80211_dwds_mcast(vap, m); 219 } 220 } 221 #ifdef IEEE80211_SUPPORT_MESH 222 if (vap->iv_opmode != IEEE80211_M_MBSS) { 223 #endif 224 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 225 if (ni == NULL) { 226 /* NB: ieee80211_find_txnode does stat+msg */ 227 IFNET_STAT_INC(ifp, oerrors, 1); 228 m_freem(m); 229 continue; 230 } 231 if (ni->ni_associd == 0 && 232 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 233 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 234 eh->ether_dhost, NULL, 235 "sta not associated (type 0x%04x)", 236 htons(eh->ether_type)); 237 vap->iv_stats.is_tx_notassoc++; 238 IFNET_STAT_INC(ifp, oerrors, 1); 239 m_freem(m); 240 ieee80211_free_node(ni); 241 continue; 242 } 243 #ifdef IEEE80211_SUPPORT_MESH 244 } else { 245 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 246 /* 247 * Proxy station only if configured. 248 */ 249 if (!ieee80211_mesh_isproxyena(vap)) { 250 IEEE80211_DISCARD_MAC(vap, 251 IEEE80211_MSG_OUTPUT | 252 IEEE80211_MSG_MESH, 253 eh->ether_dhost, NULL, 254 "%s", "proxy not enabled"); 255 vap->iv_stats.is_mesh_notproxy++; 256 IFNET_STAT_INC(ifp, oerrors, 1); 257 m_freem(m); 258 continue; 259 } 260 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 261 } 262 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 263 if (ni == NULL) { 264 /* 265 * NB: ieee80211_mesh_discover holds/disposes 266 * frame (e.g. queueing on path discovery). 267 */ 268 IFNET_STAT_INC(ifp, oerrors, 1); 269 continue; 270 } 271 } 272 #endif 273 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 274 (m->m_flags & M_PWR_SAV) == 0) { 275 /* 276 * Station in power save mode; pass the frame 277 * to the 802.11 layer and continue. We'll get 278 * the frame back when the time is right. 279 * XXX lose WDS vap linkage? 280 */ 281 (void) ieee80211_pwrsave(ni, m); 282 ieee80211_free_node(ni); 283 continue; 284 } 285 /* calculate priority so drivers can find the tx queue */ 286 if (ieee80211_classify(ni, m)) { 287 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 288 eh->ether_dhost, NULL, 289 "%s", "classification failure"); 290 vap->iv_stats.is_tx_classify++; 291 IFNET_STAT_INC(ifp, oerrors, 1); 292 m_freem(m); 293 ieee80211_free_node(ni); 294 continue; 295 } 296 /* 297 * Stash the node pointer. Note that we do this after 298 * any call to ieee80211_dwds_mcast because that code 299 * uses any existing value for rcvif to identify the 300 * interface it (might have been) received on. 301 */ 302 m->m_pkthdr.rcvif = (void *)ni; 303 304 BPF_MTAP(ifp, m); /* 802.3 tx */ 305 306 /* 307 * Check if A-MPDU tx aggregation is setup or if we 308 * should try to enable it. The sta must be associated 309 * with HT and A-MPDU enabled for use. When the policy 310 * routine decides we should enable A-MPDU we issue an 311 * ADDBA request and wait for a reply. The frame being 312 * encapsulated will go out w/o using A-MPDU, or possibly 313 * it might be collected by the driver and held/retransmit. 314 * The default ic_ampdu_enable routine handles staggering 315 * ADDBA requests in case the receiver NAK's us or we are 316 * otherwise unable to establish a BA stream. 317 */ 318 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 319 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 320 (m->m_flags & M_EAPOL) == 0) { 321 const int ac = M_WME_GETAC(m); 322 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 323 324 ieee80211_txampdu_count_packet(tap); 325 if (IEEE80211_AMPDU_RUNNING(tap)) { 326 /* 327 * Operational, mark frame for aggregation. 328 * 329 * XXX do tx aggregation here 330 */ 331 m->m_flags |= M_AMPDU_MPDU; 332 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 333 ic->ic_ampdu_enable(ni, tap)) { 334 /* 335 * Not negotiated yet, request service. 336 */ 337 ieee80211_ampdu_request(ni, tap); 338 /* XXX hold frame for reply? */ 339 } 340 } 341 #ifdef IEEE80211_SUPPORT_SUPERG 342 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 343 m = ieee80211_ff_check(ni, m); 344 if (m == NULL) { 345 /* NB: any ni ref held on stageq */ 346 continue; 347 } 348 } 349 #endif /* IEEE80211_SUPPORT_SUPERG */ 350 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 351 /* 352 * Encapsulate the packet in prep for transmission. 353 */ 354 m = ieee80211_encap(vap, ni, m); 355 if (m == NULL) { 356 /* NB: stat+msg handled in ieee80211_encap */ 357 ieee80211_free_node(ni); 358 continue; 359 } 360 } 361 362 error = ieee80211_handoff(parent, m); 363 if (error != 0) { 364 /* NB: IFQ_HANDOFF reclaims mbuf */ 365 ieee80211_free_node(ni); 366 } else { 367 IFNET_STAT_INC(ifp, opackets, 1); 368 } 369 ic->ic_lastdata = ticks; 370 } 371 #undef IS_DWDS 372 } 373 374 375 /* 376 * 802.11 output routine. This is (currently) used only to 377 * connect bpf write calls to the 802.11 layer for injecting 378 * raw 802.11 frames. 379 */ 380 int 381 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 382 struct sockaddr *dst, struct rtentry *rt) 383 { 384 #define senderr(e) do { error = (e); goto bad;} while (0) 385 struct ieee80211_node *ni = NULL; 386 struct ieee80211vap *vap; 387 struct ieee80211_frame *wh; 388 struct ifaltq_subque *ifsq; 389 int error; 390 391 ifsq = ifq_get_subq_default(&ifp->if_snd); 392 if (ifsq_is_oactive(ifsq)) { 393 /* 394 * Short-circuit requests if the vap is marked OACTIVE 395 * as this can happen because a packet came down through 396 * ieee80211_start before the vap entered RUN state in 397 * which case it's ok to just drop the frame. This 398 * should not be necessary but callers of if_output don't 399 * check OACTIVE. 400 */ 401 senderr(ENETDOWN); 402 } 403 vap = ifp->if_softc; 404 /* 405 * Hand to the 802.3 code if not tagged as 406 * a raw 802.11 frame. 407 */ 408 if (dst->sa_family != AF_IEEE80211) 409 return vap->iv_output(ifp, m, dst, rt); 410 #ifdef MAC 411 error = mac_ifnet_check_transmit(ifp, m); 412 if (error) 413 senderr(error); 414 #endif 415 if (ifp->if_flags & IFF_MONITOR) 416 senderr(ENETDOWN); 417 if (!IFNET_IS_UP_RUNNING(ifp)) 418 senderr(ENETDOWN); 419 if (vap->iv_state == IEEE80211_S_CAC) { 420 IEEE80211_DPRINTF(vap, 421 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 422 "block %s frame in CAC state\n", "raw data"); 423 vap->iv_stats.is_tx_badstate++; 424 senderr(EIO); /* XXX */ 425 } 426 /* XXX bypass bridge, pfil, carp, etc. */ 427 428 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 429 senderr(EIO); /* XXX */ 430 wh = mtod(m, struct ieee80211_frame *); 431 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 432 IEEE80211_FC0_VERSION_0) 433 senderr(EIO); /* XXX */ 434 435 /* locate destination node */ 436 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 437 case IEEE80211_FC1_DIR_NODS: 438 case IEEE80211_FC1_DIR_FROMDS: 439 ni = ieee80211_find_txnode(vap, wh->i_addr1); 440 break; 441 case IEEE80211_FC1_DIR_TODS: 442 case IEEE80211_FC1_DIR_DSTODS: 443 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 444 senderr(EIO); /* XXX */ 445 ni = ieee80211_find_txnode(vap, wh->i_addr3); 446 break; 447 default: 448 senderr(EIO); /* XXX */ 449 } 450 if (ni == NULL) { 451 /* 452 * Permit packets w/ bpf params through regardless 453 * (see below about sa_len). 454 */ 455 if (dst->sa_len == 0) 456 senderr(EHOSTUNREACH); 457 ni = ieee80211_ref_node(vap->iv_bss); 458 } 459 460 /* 461 * Sanitize mbuf for net80211 flags leaked from above. 462 * 463 * NB: This must be done before ieee80211_classify as 464 * it marks EAPOL in frames with M_EAPOL. 465 */ 466 m->m_flags &= ~M_80211_TX; 467 468 /* calculate priority so drivers can find the tx queue */ 469 /* XXX assumes an 802.3 frame */ 470 if (ieee80211_classify(ni, m)) 471 senderr(EIO); /* XXX */ 472 473 IFNET_STAT_INC(ifp, opackets, 1); 474 IEEE80211_NODE_STAT(ni, tx_data); 475 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 476 IEEE80211_NODE_STAT(ni, tx_mcast); 477 m->m_flags |= M_MCAST; 478 } else 479 IEEE80211_NODE_STAT(ni, tx_ucast); 480 /* NB: ieee80211_encap does not include 802.11 header */ 481 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 482 483 /* 484 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 485 * present by setting the sa_len field of the sockaddr (yes, 486 * this is a hack). 487 * NB: we assume sa_data is suitably aligned to cast. 488 */ 489 return vap->iv_ic->ic_raw_xmit(ni, m, 490 (const struct ieee80211_bpf_params *)(dst->sa_len ? 491 dst->sa_data : NULL)); 492 bad: 493 if (m != NULL) 494 m_freem(m); 495 if (ni != NULL) 496 ieee80211_free_node(ni); 497 IFNET_STAT_INC(ifp, oerrors, 1); 498 return error; 499 #undef senderr 500 } 501 502 /* 503 * Set the direction field and address fields of an outgoing 504 * frame. Note this should be called early on in constructing 505 * a frame as it sets i_fc[1]; other bits can then be or'd in. 506 */ 507 void 508 ieee80211_send_setup( 509 struct ieee80211_node *ni, 510 struct mbuf *m, 511 int type, int tid, 512 const uint8_t sa[IEEE80211_ADDR_LEN], 513 const uint8_t da[IEEE80211_ADDR_LEN], 514 const uint8_t bssid[IEEE80211_ADDR_LEN]) 515 { 516 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 517 struct ieee80211vap *vap = ni->ni_vap; 518 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 519 ieee80211_seq seqno; 520 521 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 522 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 523 switch (vap->iv_opmode) { 524 case IEEE80211_M_STA: 525 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 526 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 527 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 528 IEEE80211_ADDR_COPY(wh->i_addr3, da); 529 break; 530 case IEEE80211_M_IBSS: 531 case IEEE80211_M_AHDEMO: 532 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 533 IEEE80211_ADDR_COPY(wh->i_addr1, da); 534 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 535 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 536 break; 537 case IEEE80211_M_HOSTAP: 538 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 539 IEEE80211_ADDR_COPY(wh->i_addr1, da); 540 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 541 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 542 break; 543 case IEEE80211_M_WDS: 544 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 545 IEEE80211_ADDR_COPY(wh->i_addr1, da); 546 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 547 IEEE80211_ADDR_COPY(wh->i_addr3, da); 548 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 549 break; 550 case IEEE80211_M_MBSS: 551 #ifdef IEEE80211_SUPPORT_MESH 552 /* XXX add support for proxied addresses */ 553 if (IEEE80211_IS_MULTICAST(da)) { 554 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 555 /* XXX next hop */ 556 IEEE80211_ADDR_COPY(wh->i_addr1, da); 557 IEEE80211_ADDR_COPY(wh->i_addr2, 558 vap->iv_myaddr); 559 } else { 560 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 561 IEEE80211_ADDR_COPY(wh->i_addr1, da); 562 IEEE80211_ADDR_COPY(wh->i_addr2, 563 vap->iv_myaddr); 564 IEEE80211_ADDR_COPY(wh->i_addr3, da); 565 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 566 } 567 #endif 568 break; 569 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 570 break; 571 } 572 } else { 573 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 574 IEEE80211_ADDR_COPY(wh->i_addr1, da); 575 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 576 #ifdef IEEE80211_SUPPORT_MESH 577 if (vap->iv_opmode == IEEE80211_M_MBSS) 578 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 579 else 580 #endif 581 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 582 } 583 *(uint16_t *)&wh->i_dur[0] = 0; 584 585 seqno = ni->ni_txseqs[tid]++; 586 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 587 M_SEQNO_SET(m, seqno); 588 589 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 590 m->m_flags |= M_MCAST; 591 #undef WH4 592 } 593 594 /* 595 * Send a management frame to the specified node. The node pointer 596 * must have a reference as the pointer will be passed to the driver 597 * and potentially held for a long time. If the frame is successfully 598 * dispatched to the driver, then it is responsible for freeing the 599 * reference (and potentially free'ing up any associated storage); 600 * otherwise deal with reclaiming any reference (on error). 601 */ 602 int 603 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 604 struct ieee80211_bpf_params *params) 605 { 606 struct ieee80211vap *vap = ni->ni_vap; 607 struct ieee80211com *ic = ni->ni_ic; 608 struct ieee80211_frame *wh; 609 #ifdef IEEE80211_DEBUG 610 char ethstr[ETHER_ADDRSTRLEN + 1]; 611 #endif 612 KASSERT(ni != NULL, ("null node")); 613 614 if (vap->iv_state == IEEE80211_S_CAC) { 615 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 616 ni, "block %s frame in CAC state", 617 ieee80211_mgt_subtype_name[ 618 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 619 IEEE80211_FC0_SUBTYPE_SHIFT]); 620 vap->iv_stats.is_tx_badstate++; 621 ieee80211_free_node(ni); 622 m_freem(m); 623 return EIO; /* XXX */ 624 } 625 626 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 627 if (m == NULL) { 628 ieee80211_free_node(ni); 629 return ENOMEM; 630 } 631 632 wh = mtod(m, struct ieee80211_frame *); 633 ieee80211_send_setup(ni, m, 634 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 635 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 636 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 637 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 638 "encrypting frame (%s)", __func__); 639 wh->i_fc[1] |= IEEE80211_FC1_WEP; 640 } 641 m->m_flags |= M_ENCAP; /* mark encapsulated */ 642 643 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 644 M_WME_SETAC(m, params->ibp_pri); 645 646 #ifdef IEEE80211_DEBUG 647 /* avoid printing too many frames */ 648 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 649 ieee80211_msg_dumppkts(vap)) { 650 kprintf("[%s] send %s on channel %u\n", 651 kether_ntoa(wh->i_addr1, ethstr), 652 ieee80211_mgt_subtype_name[ 653 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 654 IEEE80211_FC0_SUBTYPE_SHIFT], 655 ieee80211_chan2ieee(ic, ic->ic_curchan)); 656 } 657 #endif 658 IEEE80211_NODE_STAT(ni, tx_mgmt); 659 660 return ic->ic_raw_xmit(ni, m, params); 661 } 662 663 /* 664 * Send a null data frame to the specified node. If the station 665 * is setup for QoS then a QoS Null Data frame is constructed. 666 * If this is a WDS station then a 4-address frame is constructed. 667 * 668 * NB: the caller is assumed to have setup a node reference 669 * for use; this is necessary to deal with a race condition 670 * when probing for inactive stations. Like ieee80211_mgmt_output 671 * we must cleanup any node reference on error; however we 672 * can safely just unref it as we know it will never be the 673 * last reference to the node. 674 */ 675 int 676 ieee80211_send_nulldata(struct ieee80211_node *ni) 677 { 678 struct ieee80211vap *vap = ni->ni_vap; 679 struct ieee80211com *ic = ni->ni_ic; 680 struct mbuf *m; 681 struct ieee80211_frame *wh; 682 int hdrlen; 683 uint8_t *frm; 684 685 if (vap->iv_state == IEEE80211_S_CAC) { 686 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 687 ni, "block %s frame in CAC state", "null data"); 688 ieee80211_unref_node(&ni); 689 vap->iv_stats.is_tx_badstate++; 690 return EIO; /* XXX */ 691 } 692 693 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 694 hdrlen = sizeof(struct ieee80211_qosframe); 695 else 696 hdrlen = sizeof(struct ieee80211_frame); 697 /* NB: only WDS vap's get 4-address frames */ 698 if (vap->iv_opmode == IEEE80211_M_WDS) 699 hdrlen += IEEE80211_ADDR_LEN; 700 if (ic->ic_flags & IEEE80211_F_DATAPAD) 701 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 702 703 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 704 if (m == NULL) { 705 /* XXX debug msg */ 706 ieee80211_unref_node(&ni); 707 vap->iv_stats.is_tx_nobuf++; 708 return ENOMEM; 709 } 710 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 711 ("leading space %zd", M_LEADINGSPACE(m))); 712 M_PREPEND(m, hdrlen, MB_DONTWAIT); 713 if (m == NULL) { 714 /* NB: cannot happen */ 715 ieee80211_free_node(ni); 716 return ENOMEM; 717 } 718 719 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 720 if (ni->ni_flags & IEEE80211_NODE_QOS) { 721 const int tid = WME_AC_TO_TID(WME_AC_BE); 722 uint8_t *qos; 723 724 ieee80211_send_setup(ni, m, 725 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 726 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 727 728 if (vap->iv_opmode == IEEE80211_M_WDS) 729 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 730 else 731 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 732 qos[0] = tid & IEEE80211_QOS_TID; 733 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 734 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 735 qos[1] = 0; 736 } else { 737 ieee80211_send_setup(ni, m, 738 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 739 IEEE80211_NONQOS_TID, 740 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 741 } 742 if (vap->iv_opmode != IEEE80211_M_WDS) { 743 /* NB: power management bit is never sent by an AP */ 744 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 745 vap->iv_opmode != IEEE80211_M_HOSTAP) 746 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 747 } 748 m->m_len = m->m_pkthdr.len = hdrlen; 749 m->m_flags |= M_ENCAP; /* mark encapsulated */ 750 751 M_WME_SETAC(m, WME_AC_BE); 752 753 IEEE80211_NODE_STAT(ni, tx_data); 754 755 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 756 "send %snull data frame on channel %u, pwr mgt %s", 757 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 758 ieee80211_chan2ieee(ic, ic->ic_curchan), 759 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 760 761 return ic->ic_raw_xmit(ni, m, NULL); 762 } 763 764 /* 765 * Assign priority to a frame based on any vlan tag assigned 766 * to the station and/or any Diffserv setting in an IP header. 767 * Finally, if an ACM policy is setup (in station mode) it's 768 * applied. 769 */ 770 int 771 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 772 { 773 const struct ether_header *eh = mtod(m, struct ether_header *); 774 int v_wme_ac, d_wme_ac, ac; 775 776 /* 777 * Always promote PAE/EAPOL frames to high priority. 778 */ 779 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 780 /* NB: mark so others don't need to check header */ 781 m->m_flags |= M_EAPOL; 782 ac = WME_AC_VO; 783 goto done; 784 } 785 /* 786 * Non-qos traffic goes to BE. 787 */ 788 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 789 ac = WME_AC_BE; 790 goto done; 791 } 792 793 /* 794 * If node has a vlan tag then all traffic 795 * to it must have a matching tag. 796 */ 797 v_wme_ac = 0; 798 if (ni->ni_vlan != 0) { 799 if ((m->m_flags & M_VLANTAG) == 0) { 800 IEEE80211_NODE_STAT(ni, tx_novlantag); 801 return 1; 802 } 803 #ifdef __FreeBSD__ 804 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 805 EVL_VLANOFTAG(ni->ni_vlan)) { 806 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 807 return 1; 808 } 809 /* map vlan priority to AC */ 810 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 811 #endif 812 } 813 814 /* XXX m_copydata may be too slow for fast path */ 815 #ifdef INET 816 if (eh->ether_type == htons(ETHERTYPE_IP)) { 817 uint8_t tos; 818 /* 819 * IP frame, map the DSCP bits from the TOS field. 820 */ 821 /* NB: ip header may not be in first mbuf */ 822 m_copydata(m, sizeof(struct ether_header) + 823 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 824 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 825 d_wme_ac = TID_TO_WME_AC(tos); 826 } else { 827 #endif /* INET */ 828 #ifdef INET6 829 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 830 uint32_t flow; 831 uint8_t tos; 832 /* 833 * IPv6 frame, map the DSCP bits from the TOS field. 834 */ 835 m_copydata(m, sizeof(struct ether_header) + 836 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 837 (caddr_t) &flow); 838 tos = (uint8_t)(ntohl(flow) >> 20); 839 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 840 d_wme_ac = TID_TO_WME_AC(tos); 841 } else { 842 #endif /* INET6 */ 843 d_wme_ac = WME_AC_BE; 844 #ifdef INET6 845 } 846 #endif 847 #ifdef INET 848 } 849 #endif 850 /* 851 * Use highest priority AC. 852 */ 853 if (v_wme_ac > d_wme_ac) 854 ac = v_wme_ac; 855 else 856 ac = d_wme_ac; 857 858 /* 859 * Apply ACM policy. 860 */ 861 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 862 static const int acmap[4] = { 863 WME_AC_BK, /* WME_AC_BE */ 864 WME_AC_BK, /* WME_AC_BK */ 865 WME_AC_BE, /* WME_AC_VI */ 866 WME_AC_VI, /* WME_AC_VO */ 867 }; 868 struct ieee80211com *ic = ni->ni_ic; 869 870 while (ac != WME_AC_BK && 871 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 872 ac = acmap[ac]; 873 } 874 done: 875 M_WME_SETAC(m, ac); 876 return 0; 877 } 878 879 /* 880 * Insure there is sufficient contiguous space to encapsulate the 881 * 802.11 data frame. If room isn't already there, arrange for it. 882 * Drivers and cipher modules assume we have done the necessary work 883 * and fail rudely if they don't find the space they need. 884 */ 885 struct mbuf * 886 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 887 struct ieee80211_key *key, struct mbuf *m) 888 { 889 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 890 struct mbuf *mnew = NULL; 891 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 892 893 if (key != NULL) { 894 /* XXX belongs in crypto code? */ 895 needed_space += key->wk_cipher->ic_header; 896 /* XXX frags */ 897 /* 898 * When crypto is being done in the host we must insure 899 * the data are writable for the cipher routines; clone 900 * a writable mbuf chain. 901 * XXX handle SWMIC specially 902 */ 903 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 904 mnew = m_dup(m, MB_DONTWAIT); 905 if (m == NULL) { 906 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 907 "%s: cannot get writable mbuf\n", __func__); 908 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 909 return NULL; 910 } 911 m_freem(m); 912 m = mnew; 913 } 914 } 915 /* 916 * We know we are called just before stripping an Ethernet 917 * header and prepending an LLC header. This means we know 918 * there will be 919 * sizeof(struct ether_header) - sizeof(struct llc) 920 * bytes recovered to which we need additional space for the 921 * 802.11 header and any crypto header. 922 */ 923 /* XXX check trailing space and copy instead? */ 924 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 925 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type); 926 if (n == NULL) { 927 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 928 "%s: cannot expand storage\n", __func__); 929 vap->iv_stats.is_tx_nobuf++; 930 m_freem(m); 931 return NULL; 932 } 933 KASSERT(needed_space <= MHLEN, 934 ("not enough room, need %u got %zu", needed_space, MHLEN)); 935 /* 936 * Setup new mbuf to have leading space to prepend the 937 * 802.11 header and any crypto header bits that are 938 * required (the latter are added when the driver calls 939 * back to ieee80211_crypto_encap to do crypto encapsulation). 940 */ 941 /* NB: must be first 'cuz it clobbers m_data */ 942 m_move_pkthdr(n, m); 943 n->m_len = 0; /* NB: m_gethdr does not set */ 944 n->m_data += needed_space; 945 /* 946 * Pull up Ethernet header to create the expected layout. 947 * We could use m_pullup but that's overkill (i.e. we don't 948 * need the actual data) and it cannot fail so do it inline 949 * for speed. 950 */ 951 /* NB: struct ether_header is known to be contiguous */ 952 n->m_len += sizeof(struct ether_header); 953 m->m_len -= sizeof(struct ether_header); 954 m->m_data += sizeof(struct ether_header); 955 /* 956 * Replace the head of the chain. 957 */ 958 n->m_next = m; 959 m = n; 960 } 961 return m; 962 #undef TO_BE_RECLAIMED 963 } 964 965 /* 966 * Return the transmit key to use in sending a unicast frame. 967 * If a unicast key is set we use that. When no unicast key is set 968 * we fall back to the default transmit key. 969 */ 970 static __inline struct ieee80211_key * 971 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 972 struct ieee80211_node *ni) 973 { 974 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 975 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 976 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 977 return NULL; 978 return &vap->iv_nw_keys[vap->iv_def_txkey]; 979 } else { 980 return &ni->ni_ucastkey; 981 } 982 } 983 984 /* 985 * Return the transmit key to use in sending a multicast frame. 986 * Multicast traffic always uses the group key which is installed as 987 * the default tx key. 988 */ 989 static __inline struct ieee80211_key * 990 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 991 struct ieee80211_node *ni) 992 { 993 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 994 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 995 return NULL; 996 return &vap->iv_nw_keys[vap->iv_def_txkey]; 997 } 998 999 /* 1000 * Encapsulate an outbound data frame. The mbuf chain is updated. 1001 * If an error is encountered NULL is returned. The caller is required 1002 * to provide a node reference and pullup the ethernet header in the 1003 * first mbuf. 1004 * 1005 * NB: Packet is assumed to be processed by ieee80211_classify which 1006 * marked EAPOL frames w/ M_EAPOL. 1007 */ 1008 struct mbuf * 1009 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1010 struct mbuf *m) 1011 { 1012 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1013 struct ieee80211com *ic = ni->ni_ic; 1014 #ifdef IEEE80211_SUPPORT_MESH 1015 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1016 struct ieee80211_meshcntl_ae10 *mc; 1017 #endif 1018 struct ether_header eh; 1019 struct ieee80211_frame *wh; 1020 struct ieee80211_key *key; 1021 struct llc *llc; 1022 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1023 ieee80211_seq seqno; 1024 int meshhdrsize, meshae; 1025 uint8_t *qos; 1026 1027 /* 1028 * Copy existing Ethernet header to a safe place. The 1029 * rest of the code assumes it's ok to strip it when 1030 * reorganizing state for the final encapsulation. 1031 */ 1032 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1033 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1034 1035 /* 1036 * Insure space for additional headers. First identify 1037 * transmit key to use in calculating any buffer adjustments 1038 * required. This is also used below to do privacy 1039 * encapsulation work. Then calculate the 802.11 header 1040 * size and any padding required by the driver. 1041 * 1042 * Note key may be NULL if we fall back to the default 1043 * transmit key and that is not set. In that case the 1044 * buffer may not be expanded as needed by the cipher 1045 * routines, but they will/should discard it. 1046 */ 1047 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1048 if (vap->iv_opmode == IEEE80211_M_STA || 1049 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1050 (vap->iv_opmode == IEEE80211_M_WDS && 1051 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1052 key = ieee80211_crypto_getucastkey(vap, ni); 1053 else 1054 key = ieee80211_crypto_getmcastkey(vap, ni); 1055 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1056 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1057 eh.ether_dhost, 1058 "no default transmit key (%s) deftxkey %u", 1059 __func__, vap->iv_def_txkey); 1060 vap->iv_stats.is_tx_nodefkey++; 1061 goto bad; 1062 } 1063 } else 1064 key = NULL; 1065 /* 1066 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1067 * frames so suppress use. This may be an issue if other 1068 * ap's require all data frames to be QoS-encapsulated 1069 * once negotiated in which case we'll need to make this 1070 * configurable. 1071 */ 1072 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1073 (m->m_flags & M_EAPOL) == 0; 1074 if (addqos) 1075 hdrsize = sizeof(struct ieee80211_qosframe); 1076 else 1077 hdrsize = sizeof(struct ieee80211_frame); 1078 #ifdef IEEE80211_SUPPORT_MESH 1079 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1080 /* 1081 * Mesh data frames are encapsulated according to the 1082 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1083 * o Group Addressed data (aka multicast) originating 1084 * at the local sta are sent w/ 3-address format and 1085 * address extension mode 00 1086 * o Individually Addressed data (aka unicast) originating 1087 * at the local sta are sent w/ 4-address format and 1088 * address extension mode 00 1089 * o Group Addressed data forwarded from a non-mesh sta are 1090 * sent w/ 3-address format and address extension mode 01 1091 * o Individually Address data from another sta are sent 1092 * w/ 4-address format and address extension mode 10 1093 */ 1094 is4addr = 0; /* NB: don't use, disable */ 1095 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1096 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1097 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1098 /* XXX defines for AE modes */ 1099 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1100 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1101 meshae = 0; 1102 else 1103 meshae = 4; /* NB: pseudo */ 1104 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1105 meshae = 1; 1106 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1107 } else { 1108 meshae = 2; 1109 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1110 } 1111 } else { 1112 #endif 1113 /* 1114 * 4-address frames need to be generated for: 1115 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1116 * o packets sent through a vap marked for relaying 1117 * (e.g. a station operating with dynamic WDS) 1118 */ 1119 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1120 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1121 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1122 if (is4addr) 1123 hdrsize += IEEE80211_ADDR_LEN; 1124 meshhdrsize = meshae = 0; 1125 #ifdef IEEE80211_SUPPORT_MESH 1126 } 1127 #endif 1128 /* 1129 * Honor driver DATAPAD requirement. 1130 */ 1131 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1132 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1133 else 1134 hdrspace = hdrsize; 1135 1136 if (__predict_true((m->m_flags & M_FF) == 0)) { 1137 /* 1138 * Normal frame. 1139 */ 1140 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1141 if (m == NULL) { 1142 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1143 goto bad; 1144 } 1145 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1146 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1147 llc = mtod(m, struct llc *); 1148 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1149 llc->llc_control = LLC_UI; 1150 llc->llc_snap.org_code[0] = 0; 1151 llc->llc_snap.org_code[1] = 0; 1152 llc->llc_snap.org_code[2] = 0; 1153 llc->llc_snap.ether_type = eh.ether_type; 1154 } else { 1155 #ifdef IEEE80211_SUPPORT_SUPERG 1156 /* 1157 * Aggregated frame. 1158 */ 1159 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1160 if (m == NULL) 1161 #endif 1162 goto bad; 1163 } 1164 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1165 1166 M_PREPEND(m, hdrspace + meshhdrsize, MB_DONTWAIT); 1167 if (m == NULL) { 1168 vap->iv_stats.is_tx_nobuf++; 1169 goto bad; 1170 } 1171 wh = mtod(m, struct ieee80211_frame *); 1172 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1173 *(uint16_t *)wh->i_dur = 0; 1174 qos = NULL; /* NB: quiet compiler */ 1175 if (is4addr) { 1176 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1177 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1178 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1179 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1180 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1181 } else switch (vap->iv_opmode) { 1182 case IEEE80211_M_STA: 1183 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1184 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1185 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1186 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1187 break; 1188 case IEEE80211_M_IBSS: 1189 case IEEE80211_M_AHDEMO: 1190 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1191 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1192 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1193 /* 1194 * NB: always use the bssid from iv_bss as the 1195 * neighbor's may be stale after an ibss merge 1196 */ 1197 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1198 break; 1199 case IEEE80211_M_HOSTAP: 1200 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1201 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1202 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1203 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1204 break; 1205 #ifdef IEEE80211_SUPPORT_MESH 1206 case IEEE80211_M_MBSS: 1207 /* NB: offset by hdrspace to deal with DATAPAD */ 1208 mc = (struct ieee80211_meshcntl_ae10 *) 1209 (mtod(m, uint8_t *) + hdrspace); 1210 switch (meshae) { 1211 case 0: /* ucast, no proxy */ 1212 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1213 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1214 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1215 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1216 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1217 mc->mc_flags = 0; 1218 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1219 break; 1220 case 4: /* mcast, no proxy */ 1221 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1222 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1223 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1224 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1225 mc->mc_flags = 0; /* NB: AE is really 0 */ 1226 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1227 break; 1228 case 1: /* mcast, proxy */ 1229 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1230 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1231 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1232 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1233 mc->mc_flags = 1; 1234 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1235 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1236 break; 1237 case 2: /* ucast, proxy */ 1238 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1239 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1240 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1241 /* XXX not right, need MeshDA */ 1242 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1243 /* XXX assume are MeshSA */ 1244 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1245 mc->mc_flags = 2; 1246 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1247 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1248 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1249 break; 1250 default: 1251 KASSERT(0, ("meshae %d", meshae)); 1252 break; 1253 } 1254 mc->mc_ttl = ms->ms_ttl; 1255 ms->ms_seq++; 1256 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1257 break; 1258 #endif 1259 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1260 default: 1261 goto bad; 1262 } 1263 if (m->m_flags & M_MORE_DATA) 1264 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1265 if (addqos) { 1266 int ac, tid; 1267 1268 if (is4addr) { 1269 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1270 /* NB: mesh case handled earlier */ 1271 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1272 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1273 ac = M_WME_GETAC(m); 1274 /* map from access class/queue to 11e header priorty value */ 1275 tid = WME_AC_TO_TID(ac); 1276 qos[0] = tid & IEEE80211_QOS_TID; 1277 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1278 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1279 qos[1] = 0; 1280 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1281 1282 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1283 /* 1284 * NB: don't assign a sequence # to potential 1285 * aggregates; we expect this happens at the 1286 * point the frame comes off any aggregation q 1287 * as otherwise we may introduce holes in the 1288 * BA sequence space and/or make window accouting 1289 * more difficult. 1290 * 1291 * XXX may want to control this with a driver 1292 * capability; this may also change when we pull 1293 * aggregation up into net80211 1294 */ 1295 seqno = ni->ni_txseqs[tid]++; 1296 *(uint16_t *)wh->i_seq = 1297 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1298 M_SEQNO_SET(m, seqno); 1299 } 1300 } else { 1301 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1302 *(uint16_t *)wh->i_seq = 1303 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1304 M_SEQNO_SET(m, seqno); 1305 } 1306 1307 1308 /* check if xmit fragmentation is required */ 1309 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1310 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1311 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1312 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1313 if (key != NULL) { 1314 /* 1315 * IEEE 802.1X: send EAPOL frames always in the clear. 1316 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1317 */ 1318 if ((m->m_flags & M_EAPOL) == 0 || 1319 ((vap->iv_flags & IEEE80211_F_WPA) && 1320 (vap->iv_opmode == IEEE80211_M_STA ? 1321 !IEEE80211_KEY_UNDEFINED(key) : 1322 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1323 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1324 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1325 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1326 eh.ether_dhost, 1327 "%s", "enmic failed, discard frame"); 1328 vap->iv_stats.is_crypto_enmicfail++; 1329 goto bad; 1330 } 1331 } 1332 } 1333 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1334 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1335 goto bad; 1336 1337 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1338 1339 IEEE80211_NODE_STAT(ni, tx_data); 1340 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1341 IEEE80211_NODE_STAT(ni, tx_mcast); 1342 m->m_flags |= M_MCAST; 1343 } else 1344 IEEE80211_NODE_STAT(ni, tx_ucast); 1345 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1346 1347 return m; 1348 bad: 1349 if (m != NULL) 1350 m_freem(m); 1351 return NULL; 1352 #undef WH4 1353 } 1354 1355 /* 1356 * Fragment the frame according to the specified mtu. 1357 * The size of the 802.11 header (w/o padding) is provided 1358 * so we don't need to recalculate it. We create a new 1359 * mbuf for each fragment and chain it through m_nextpkt; 1360 * we might be able to optimize this by reusing the original 1361 * packet's mbufs but that is significantly more complicated. 1362 */ 1363 static int 1364 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1365 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1366 { 1367 struct ieee80211_frame *wh, *whf; 1368 struct mbuf *m, *prev, *next; 1369 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1370 1371 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1372 KASSERT(m0->m_pkthdr.len > mtu, 1373 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1374 1375 wh = mtod(m0, struct ieee80211_frame *); 1376 /* NB: mark the first frag; it will be propagated below */ 1377 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1378 totalhdrsize = hdrsize + ciphdrsize; 1379 fragno = 1; 1380 off = mtu - ciphdrsize; 1381 remainder = m0->m_pkthdr.len - off; 1382 prev = m0; 1383 do { 1384 fragsize = totalhdrsize + remainder; 1385 if (fragsize > mtu) 1386 fragsize = mtu; 1387 /* XXX fragsize can be >2048! */ 1388 KASSERT(fragsize < MCLBYTES, 1389 ("fragment size %u too big!", fragsize)); 1390 if (fragsize > MHLEN) 1391 m = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR); 1392 else 1393 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1394 if (m == NULL) 1395 goto bad; 1396 /* leave room to prepend any cipher header */ 1397 m_align(m, fragsize - ciphdrsize); 1398 1399 /* 1400 * Form the header in the fragment. Note that since 1401 * we mark the first fragment with the MORE_FRAG bit 1402 * it automatically is propagated to each fragment; we 1403 * need only clear it on the last fragment (done below). 1404 */ 1405 whf = mtod(m, struct ieee80211_frame *); 1406 memcpy(whf, wh, hdrsize); 1407 *(uint16_t *)&whf->i_seq[0] |= htole16( 1408 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1409 IEEE80211_SEQ_FRAG_SHIFT); 1410 fragno++; 1411 1412 payload = fragsize - totalhdrsize; 1413 /* NB: destination is known to be contiguous */ 1414 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1415 m->m_len = hdrsize + payload; 1416 m->m_pkthdr.len = hdrsize + payload; 1417 m->m_flags |= M_FRAG; 1418 m->m_pkthdr.rcvif = m0->m_pkthdr.rcvif; 1419 1420 /* chain up the fragment */ 1421 prev->m_nextpkt = m; 1422 prev = m; 1423 1424 /* deduct fragment just formed */ 1425 remainder -= payload; 1426 off += payload; 1427 } while (remainder != 0); 1428 1429 /* set the last fragment */ 1430 m->m_flags |= M_LASTFRAG; 1431 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1432 1433 /* strip first mbuf now that everything has been copied */ 1434 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1435 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1436 1437 vap->iv_stats.is_tx_fragframes++; 1438 vap->iv_stats.is_tx_frags += fragno-1; 1439 1440 return 1; 1441 bad: 1442 /* reclaim fragments but leave original frame for caller to free */ 1443 for (m = m0->m_nextpkt; m != NULL; m = next) { 1444 next = m->m_nextpkt; 1445 m->m_nextpkt = NULL; /* XXX paranoid */ 1446 m_freem(m); 1447 } 1448 m0->m_nextpkt = NULL; 1449 return 0; 1450 } 1451 1452 /* 1453 * Add a supported rates element id to a frame. 1454 */ 1455 uint8_t * 1456 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1457 { 1458 int nrates; 1459 1460 *frm++ = IEEE80211_ELEMID_RATES; 1461 nrates = rs->rs_nrates; 1462 if (nrates > IEEE80211_RATE_SIZE) 1463 nrates = IEEE80211_RATE_SIZE; 1464 *frm++ = nrates; 1465 memcpy(frm, rs->rs_rates, nrates); 1466 return frm + nrates; 1467 } 1468 1469 /* 1470 * Add an extended supported rates element id to a frame. 1471 */ 1472 uint8_t * 1473 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1474 { 1475 /* 1476 * Add an extended supported rates element if operating in 11g mode. 1477 */ 1478 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1479 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1480 *frm++ = IEEE80211_ELEMID_XRATES; 1481 *frm++ = nrates; 1482 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1483 frm += nrates; 1484 } 1485 return frm; 1486 } 1487 1488 /* 1489 * Add an ssid element to a frame. 1490 */ 1491 static uint8_t * 1492 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1493 { 1494 *frm++ = IEEE80211_ELEMID_SSID; 1495 *frm++ = len; 1496 memcpy(frm, ssid, len); 1497 return frm + len; 1498 } 1499 1500 /* 1501 * Add an erp element to a frame. 1502 */ 1503 static uint8_t * 1504 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1505 { 1506 uint8_t erp; 1507 1508 *frm++ = IEEE80211_ELEMID_ERP; 1509 *frm++ = 1; 1510 erp = 0; 1511 if (ic->ic_nonerpsta != 0) 1512 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1513 if (ic->ic_flags & IEEE80211_F_USEPROT) 1514 erp |= IEEE80211_ERP_USE_PROTECTION; 1515 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1516 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1517 *frm++ = erp; 1518 return frm; 1519 } 1520 1521 /* 1522 * Add a CFParams element to a frame. 1523 */ 1524 static uint8_t * 1525 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1526 { 1527 #define ADDSHORT(frm, v) do { \ 1528 LE_WRITE_2(frm, v); \ 1529 frm += 2; \ 1530 } while (0) 1531 *frm++ = IEEE80211_ELEMID_CFPARMS; 1532 *frm++ = 6; 1533 *frm++ = 0; /* CFP count */ 1534 *frm++ = 2; /* CFP period */ 1535 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1536 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1537 return frm; 1538 #undef ADDSHORT 1539 } 1540 1541 static __inline uint8_t * 1542 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1543 { 1544 memcpy(frm, ie->ie_data, ie->ie_len); 1545 return frm + ie->ie_len; 1546 } 1547 1548 static __inline uint8_t * 1549 add_ie(uint8_t *frm, const uint8_t *ie) 1550 { 1551 memcpy(frm, ie, 2 + ie[1]); 1552 return frm + 2 + ie[1]; 1553 } 1554 1555 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1556 /* 1557 * Add a WME information element to a frame. 1558 */ 1559 static uint8_t * 1560 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1561 { 1562 static const struct ieee80211_wme_info info = { 1563 .wme_id = IEEE80211_ELEMID_VENDOR, 1564 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1565 .wme_oui = { WME_OUI_BYTES }, 1566 .wme_type = WME_OUI_TYPE, 1567 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1568 .wme_version = WME_VERSION, 1569 .wme_info = 0, 1570 }; 1571 memcpy(frm, &info, sizeof(info)); 1572 return frm + sizeof(info); 1573 } 1574 1575 /* 1576 * Add a WME parameters element to a frame. 1577 */ 1578 static uint8_t * 1579 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1580 { 1581 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1582 #define ADDSHORT(frm, v) do { \ 1583 LE_WRITE_2(frm, v); \ 1584 frm += 2; \ 1585 } while (0) 1586 /* NB: this works 'cuz a param has an info at the front */ 1587 static const struct ieee80211_wme_info param = { 1588 .wme_id = IEEE80211_ELEMID_VENDOR, 1589 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1590 .wme_oui = { WME_OUI_BYTES }, 1591 .wme_type = WME_OUI_TYPE, 1592 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1593 .wme_version = WME_VERSION, 1594 }; 1595 int i; 1596 1597 memcpy(frm, ¶m, sizeof(param)); 1598 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1599 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1600 *frm++ = 0; /* reserved field */ 1601 for (i = 0; i < WME_NUM_AC; i++) { 1602 const struct wmeParams *ac = 1603 &wme->wme_bssChanParams.cap_wmeParams[i]; 1604 *frm++ = SM(i, WME_PARAM_ACI) 1605 | SM(ac->wmep_acm, WME_PARAM_ACM) 1606 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1607 ; 1608 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1609 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1610 ; 1611 ADDSHORT(frm, ac->wmep_txopLimit); 1612 } 1613 return frm; 1614 #undef SM 1615 #undef ADDSHORT 1616 } 1617 #undef WME_OUI_BYTES 1618 1619 /* 1620 * Add an 11h Power Constraint element to a frame. 1621 */ 1622 static uint8_t * 1623 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1624 { 1625 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1626 /* XXX per-vap tx power limit? */ 1627 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1628 1629 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1630 frm[1] = 1; 1631 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1632 return frm + 3; 1633 } 1634 1635 /* 1636 * Add an 11h Power Capability element to a frame. 1637 */ 1638 static uint8_t * 1639 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1640 { 1641 frm[0] = IEEE80211_ELEMID_PWRCAP; 1642 frm[1] = 2; 1643 frm[2] = c->ic_minpower; 1644 frm[3] = c->ic_maxpower; 1645 return frm + 4; 1646 } 1647 1648 /* 1649 * Add an 11h Supported Channels element to a frame. 1650 */ 1651 static uint8_t * 1652 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1653 { 1654 static const int ielen = 26; 1655 1656 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1657 frm[1] = ielen; 1658 /* XXX not correct */ 1659 memcpy(frm+2, ic->ic_chan_avail, ielen); 1660 return frm + 2 + ielen; 1661 } 1662 1663 /* 1664 * Add an 11h Channel Switch Announcement element to a frame. 1665 * Note that we use the per-vap CSA count to adjust the global 1666 * counter so we can use this routine to form probe response 1667 * frames and get the current count. 1668 */ 1669 static uint8_t * 1670 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1671 { 1672 struct ieee80211com *ic = vap->iv_ic; 1673 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1674 1675 csa->csa_ie = IEEE80211_ELEMID_CSA; 1676 csa->csa_len = 3; 1677 csa->csa_mode = 1; /* XXX force quiet on channel */ 1678 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1679 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1680 return frm + sizeof(*csa); 1681 } 1682 1683 /* 1684 * Add an 11h country information element to a frame. 1685 */ 1686 static uint8_t * 1687 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1688 { 1689 1690 if (ic->ic_countryie == NULL || 1691 ic->ic_countryie_chan != ic->ic_bsschan) { 1692 /* 1693 * Handle lazy construction of ie. This is done on 1694 * first use and after a channel change that requires 1695 * re-calculation. 1696 */ 1697 if (ic->ic_countryie != NULL) 1698 kfree(ic->ic_countryie, M_80211_NODE_IE); 1699 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1700 if (ic->ic_countryie == NULL) 1701 return frm; 1702 ic->ic_countryie_chan = ic->ic_bsschan; 1703 } 1704 return add_appie(frm, ic->ic_countryie); 1705 } 1706 1707 /* 1708 * Send a probe request frame with the specified ssid 1709 * and any optional information element data. 1710 */ 1711 int 1712 ieee80211_send_probereq(struct ieee80211_node *ni, 1713 const uint8_t sa[IEEE80211_ADDR_LEN], 1714 const uint8_t da[IEEE80211_ADDR_LEN], 1715 const uint8_t bssid[IEEE80211_ADDR_LEN], 1716 const uint8_t *ssid, size_t ssidlen) 1717 { 1718 struct ieee80211vap *vap = ni->ni_vap; 1719 struct ieee80211com *ic = ni->ni_ic; 1720 const struct ieee80211_txparam *tp; 1721 struct ieee80211_bpf_params params; 1722 const struct ieee80211_rateset *rs; 1723 struct mbuf *m; 1724 uint8_t *frm; 1725 #ifdef IEEE80211_DEBUG 1726 char ethstr[ETHER_ADDRSTRLEN + 1]; 1727 #endif 1728 1729 if (vap->iv_state == IEEE80211_S_CAC) { 1730 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1731 "block %s frame in CAC state", "probe request"); 1732 vap->iv_stats.is_tx_badstate++; 1733 return EIO; /* XXX */ 1734 } 1735 1736 /* 1737 * Hold a reference on the node so it doesn't go away until after 1738 * the xmit is complete all the way in the driver. On error we 1739 * will remove our reference. 1740 */ 1741 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1742 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1743 __func__, __LINE__, 1744 ni, kether_ntoa(ni->ni_macaddr, ethstr), 1745 ieee80211_node_refcnt(ni)+1); 1746 ieee80211_ref_node(ni); 1747 1748 /* 1749 * prreq frame format 1750 * [tlv] ssid 1751 * [tlv] supported rates 1752 * [tlv] RSN (optional) 1753 * [tlv] extended supported rates 1754 * [tlv] WPA (optional) 1755 * [tlv] user-specified ie's 1756 */ 1757 m = ieee80211_getmgtframe(&frm, 1758 ic->ic_headroom + sizeof(struct ieee80211_frame), 1759 2 + IEEE80211_NWID_LEN 1760 + 2 + IEEE80211_RATE_SIZE 1761 + sizeof(struct ieee80211_ie_wpa) 1762 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1763 + sizeof(struct ieee80211_ie_wpa) 1764 + (vap->iv_appie_probereq != NULL ? 1765 vap->iv_appie_probereq->ie_len : 0) 1766 ); 1767 if (m == NULL) { 1768 vap->iv_stats.is_tx_nobuf++; 1769 ieee80211_free_node(ni); 1770 return ENOMEM; 1771 } 1772 1773 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1774 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1775 frm = ieee80211_add_rates(frm, rs); 1776 if (vap->iv_flags & IEEE80211_F_WPA2) { 1777 if (vap->iv_rsn_ie != NULL) 1778 frm = add_ie(frm, vap->iv_rsn_ie); 1779 /* XXX else complain? */ 1780 } 1781 frm = ieee80211_add_xrates(frm, rs); 1782 if (vap->iv_flags & IEEE80211_F_WPA1) { 1783 if (vap->iv_wpa_ie != NULL) 1784 frm = add_ie(frm, vap->iv_wpa_ie); 1785 /* XXX else complain? */ 1786 } 1787 if (vap->iv_appie_probereq != NULL) 1788 frm = add_appie(frm, vap->iv_appie_probereq); 1789 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1790 1791 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1792 ("leading space %zd", M_LEADINGSPACE(m))); 1793 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1794 if (m == NULL) { 1795 /* NB: cannot happen */ 1796 ieee80211_free_node(ni); 1797 return ENOMEM; 1798 } 1799 1800 ieee80211_send_setup(ni, m, 1801 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1802 IEEE80211_NONQOS_TID, sa, da, bssid); 1803 /* XXX power management? */ 1804 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1805 1806 M_WME_SETAC(m, WME_AC_BE); 1807 1808 IEEE80211_NODE_STAT(ni, tx_probereq); 1809 IEEE80211_NODE_STAT(ni, tx_mgmt); 1810 1811 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1812 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1813 ieee80211_chan2ieee(ic, ic->ic_curchan), kether_ntoa(bssid, ethstr), 1814 (int)ssidlen, ssid); 1815 1816 memset(¶ms, 0, sizeof(params)); 1817 params.ibp_pri = M_WME_GETAC(m); 1818 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1819 params.ibp_rate0 = tp->mgmtrate; 1820 if (IEEE80211_IS_MULTICAST(da)) { 1821 params.ibp_flags |= IEEE80211_BPF_NOACK; 1822 params.ibp_try0 = 1; 1823 } else 1824 params.ibp_try0 = tp->maxretry; 1825 params.ibp_power = ni->ni_txpower; 1826 return ic->ic_raw_xmit(ni, m, ¶ms); 1827 } 1828 1829 /* 1830 * Calculate capability information for mgt frames. 1831 */ 1832 uint16_t 1833 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1834 { 1835 struct ieee80211com *ic = vap->iv_ic; 1836 uint16_t capinfo; 1837 1838 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1839 1840 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1841 capinfo = IEEE80211_CAPINFO_ESS; 1842 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1843 capinfo = IEEE80211_CAPINFO_IBSS; 1844 else 1845 capinfo = 0; 1846 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1847 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1848 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1849 IEEE80211_IS_CHAN_2GHZ(chan)) 1850 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1851 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1852 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1853 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1854 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1855 return capinfo; 1856 } 1857 1858 /* 1859 * Send a management frame. The node is for the destination (or ic_bss 1860 * when in station mode). Nodes other than ic_bss have their reference 1861 * count bumped to reflect our use for an indeterminant time. 1862 */ 1863 int 1864 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1865 { 1866 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1867 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1868 struct ieee80211vap *vap = ni->ni_vap; 1869 struct ieee80211com *ic = ni->ni_ic; 1870 struct ieee80211_node *bss = vap->iv_bss; 1871 struct ieee80211_bpf_params params; 1872 struct mbuf *m; 1873 uint8_t *frm; 1874 uint16_t capinfo; 1875 int has_challenge, is_shared_key, ret, status; 1876 #ifdef IEEE80211_DEBUG 1877 char ethstr[ETHER_ADDRSTRLEN + 1]; 1878 #endif 1879 1880 KASSERT(ni != NULL, ("null node")); 1881 1882 /* 1883 * Hold a reference on the node so it doesn't go away until after 1884 * the xmit is complete all the way in the driver. On error we 1885 * will remove our reference. 1886 */ 1887 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1888 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1889 __func__, __LINE__, 1890 ni, kether_ntoa(ni->ni_macaddr, ethstr), 1891 ieee80211_node_refcnt(ni)+1); 1892 ieee80211_ref_node(ni); 1893 1894 memset(¶ms, 0, sizeof(params)); 1895 switch (type) { 1896 1897 case IEEE80211_FC0_SUBTYPE_AUTH: 1898 status = arg >> 16; 1899 arg &= 0xffff; 1900 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1901 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1902 ni->ni_challenge != NULL); 1903 1904 /* 1905 * Deduce whether we're doing open authentication or 1906 * shared key authentication. We do the latter if 1907 * we're in the middle of a shared key authentication 1908 * handshake or if we're initiating an authentication 1909 * request and configured to use shared key. 1910 */ 1911 is_shared_key = has_challenge || 1912 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1913 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1914 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1915 1916 m = ieee80211_getmgtframe(&frm, 1917 ic->ic_headroom + sizeof(struct ieee80211_frame), 1918 3 * sizeof(uint16_t) 1919 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1920 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1921 ); 1922 if (m == NULL) 1923 senderr(ENOMEM, is_tx_nobuf); 1924 1925 ((uint16_t *)frm)[0] = 1926 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1927 : htole16(IEEE80211_AUTH_ALG_OPEN); 1928 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1929 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1930 1931 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1932 ((uint16_t *)frm)[3] = 1933 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1934 IEEE80211_ELEMID_CHALLENGE); 1935 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1936 IEEE80211_CHALLENGE_LEN); 1937 m->m_pkthdr.len = m->m_len = 1938 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1939 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1940 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1941 "request encrypt frame (%s)", __func__); 1942 /* mark frame for encryption */ 1943 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1944 } 1945 } else 1946 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1947 1948 /* XXX not right for shared key */ 1949 if (status == IEEE80211_STATUS_SUCCESS) 1950 IEEE80211_NODE_STAT(ni, tx_auth); 1951 else 1952 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1953 1954 if (vap->iv_opmode == IEEE80211_M_STA) 1955 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1956 (void *) vap->iv_state); 1957 break; 1958 1959 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1960 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1961 "send station deauthenticate (reason %d)", arg); 1962 m = ieee80211_getmgtframe(&frm, 1963 ic->ic_headroom + sizeof(struct ieee80211_frame), 1964 sizeof(uint16_t)); 1965 if (m == NULL) 1966 senderr(ENOMEM, is_tx_nobuf); 1967 *(uint16_t *)frm = htole16(arg); /* reason */ 1968 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1969 1970 IEEE80211_NODE_STAT(ni, tx_deauth); 1971 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1972 1973 ieee80211_node_unauthorize(ni); /* port closed */ 1974 break; 1975 1976 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1977 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1978 /* 1979 * asreq frame format 1980 * [2] capability information 1981 * [2] listen interval 1982 * [6*] current AP address (reassoc only) 1983 * [tlv] ssid 1984 * [tlv] supported rates 1985 * [tlv] extended supported rates 1986 * [4] power capability (optional) 1987 * [28] supported channels (optional) 1988 * [tlv] HT capabilities 1989 * [tlv] WME (optional) 1990 * [tlv] Vendor OUI HT capabilities (optional) 1991 * [tlv] Atheros capabilities (if negotiated) 1992 * [tlv] AppIE's (optional) 1993 */ 1994 m = ieee80211_getmgtframe(&frm, 1995 ic->ic_headroom + sizeof(struct ieee80211_frame), 1996 sizeof(uint16_t) 1997 + sizeof(uint16_t) 1998 + IEEE80211_ADDR_LEN 1999 + 2 + IEEE80211_NWID_LEN 2000 + 2 + IEEE80211_RATE_SIZE 2001 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2002 + 4 2003 + 2 + 26 2004 + sizeof(struct ieee80211_wme_info) 2005 + sizeof(struct ieee80211_ie_htcap) 2006 + 4 + sizeof(struct ieee80211_ie_htcap) 2007 #ifdef IEEE80211_SUPPORT_SUPERG 2008 + sizeof(struct ieee80211_ath_ie) 2009 #endif 2010 + (vap->iv_appie_wpa != NULL ? 2011 vap->iv_appie_wpa->ie_len : 0) 2012 + (vap->iv_appie_assocreq != NULL ? 2013 vap->iv_appie_assocreq->ie_len : 0) 2014 ); 2015 if (m == NULL) 2016 senderr(ENOMEM, is_tx_nobuf); 2017 2018 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2019 ("wrong mode %u", vap->iv_opmode)); 2020 capinfo = IEEE80211_CAPINFO_ESS; 2021 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2022 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2023 /* 2024 * NB: Some 11a AP's reject the request when 2025 * short premable is set. 2026 */ 2027 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2028 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2029 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2030 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2031 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2032 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2033 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2034 (vap->iv_flags & IEEE80211_F_DOTH)) 2035 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2036 *(uint16_t *)frm = htole16(capinfo); 2037 frm += 2; 2038 2039 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2040 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2041 bss->ni_intval)); 2042 frm += 2; 2043 2044 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2045 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2046 frm += IEEE80211_ADDR_LEN; 2047 } 2048 2049 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2050 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2051 if (vap->iv_flags & IEEE80211_F_WPA2) { 2052 if (vap->iv_rsn_ie != NULL) 2053 frm = add_ie(frm, vap->iv_rsn_ie); 2054 /* XXX else complain? */ 2055 } 2056 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2057 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2058 frm = ieee80211_add_powercapability(frm, 2059 ic->ic_curchan); 2060 frm = ieee80211_add_supportedchannels(frm, ic); 2061 } 2062 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2063 ni->ni_ies.htcap_ie != NULL && 2064 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2065 frm = ieee80211_add_htcap(frm, ni); 2066 if (vap->iv_flags & IEEE80211_F_WPA1) { 2067 if (vap->iv_wpa_ie != NULL) 2068 frm = add_ie(frm, vap->iv_wpa_ie); 2069 /* XXX else complain */ 2070 } 2071 if ((ic->ic_flags & IEEE80211_F_WME) && 2072 ni->ni_ies.wme_ie != NULL) 2073 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2074 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2075 ni->ni_ies.htcap_ie != NULL && 2076 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2077 frm = ieee80211_add_htcap_vendor(frm, ni); 2078 #ifdef IEEE80211_SUPPORT_SUPERG 2079 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2080 frm = ieee80211_add_ath(frm, 2081 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2082 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2083 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2084 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2085 } 2086 #endif /* IEEE80211_SUPPORT_SUPERG */ 2087 if (vap->iv_appie_assocreq != NULL) 2088 frm = add_appie(frm, vap->iv_appie_assocreq); 2089 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2090 2091 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2092 (void *) vap->iv_state); 2093 break; 2094 2095 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2096 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2097 /* 2098 * asresp frame format 2099 * [2] capability information 2100 * [2] status 2101 * [2] association ID 2102 * [tlv] supported rates 2103 * [tlv] extended supported rates 2104 * [tlv] HT capabilities (standard, if STA enabled) 2105 * [tlv] HT information (standard, if STA enabled) 2106 * [tlv] WME (if configured and STA enabled) 2107 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2108 * [tlv] HT information (vendor OUI, if STA enabled) 2109 * [tlv] Atheros capabilities (if STA enabled) 2110 * [tlv] AppIE's (optional) 2111 */ 2112 m = ieee80211_getmgtframe(&frm, 2113 ic->ic_headroom + sizeof(struct ieee80211_frame), 2114 sizeof(uint16_t) 2115 + sizeof(uint16_t) 2116 + sizeof(uint16_t) 2117 + 2 + IEEE80211_RATE_SIZE 2118 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2119 + sizeof(struct ieee80211_ie_htcap) + 4 2120 + sizeof(struct ieee80211_ie_htinfo) + 4 2121 + sizeof(struct ieee80211_wme_param) 2122 #ifdef IEEE80211_SUPPORT_SUPERG 2123 + sizeof(struct ieee80211_ath_ie) 2124 #endif 2125 + (vap->iv_appie_assocresp != NULL ? 2126 vap->iv_appie_assocresp->ie_len : 0) 2127 ); 2128 if (m == NULL) 2129 senderr(ENOMEM, is_tx_nobuf); 2130 2131 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2132 *(uint16_t *)frm = htole16(capinfo); 2133 frm += 2; 2134 2135 *(uint16_t *)frm = htole16(arg); /* status */ 2136 frm += 2; 2137 2138 if (arg == IEEE80211_STATUS_SUCCESS) { 2139 *(uint16_t *)frm = htole16(ni->ni_associd); 2140 IEEE80211_NODE_STAT(ni, tx_assoc); 2141 } else 2142 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2143 frm += 2; 2144 2145 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2146 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2147 /* NB: respond according to what we received */ 2148 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2149 frm = ieee80211_add_htcap(frm, ni); 2150 frm = ieee80211_add_htinfo(frm, ni); 2151 } 2152 if ((vap->iv_flags & IEEE80211_F_WME) && 2153 ni->ni_ies.wme_ie != NULL) 2154 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2155 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2156 frm = ieee80211_add_htcap_vendor(frm, ni); 2157 frm = ieee80211_add_htinfo_vendor(frm, ni); 2158 } 2159 #ifdef IEEE80211_SUPPORT_SUPERG 2160 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2161 frm = ieee80211_add_ath(frm, 2162 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2163 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2164 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2165 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2166 #endif /* IEEE80211_SUPPORT_SUPERG */ 2167 if (vap->iv_appie_assocresp != NULL) 2168 frm = add_appie(frm, vap->iv_appie_assocresp); 2169 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2170 break; 2171 2172 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2173 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2174 "send station disassociate (reason %d)", arg); 2175 m = ieee80211_getmgtframe(&frm, 2176 ic->ic_headroom + sizeof(struct ieee80211_frame), 2177 sizeof(uint16_t)); 2178 if (m == NULL) 2179 senderr(ENOMEM, is_tx_nobuf); 2180 *(uint16_t *)frm = htole16(arg); /* reason */ 2181 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2182 2183 IEEE80211_NODE_STAT(ni, tx_disassoc); 2184 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2185 break; 2186 2187 default: 2188 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2189 "invalid mgmt frame type %u", type); 2190 senderr(EINVAL, is_tx_unknownmgt); 2191 /* NOTREACHED */ 2192 } 2193 2194 /* NB: force non-ProbeResp frames to the highest queue */ 2195 params.ibp_pri = WME_AC_VO; 2196 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2197 /* NB: we know all frames are unicast */ 2198 params.ibp_try0 = bss->ni_txparms->maxretry; 2199 params.ibp_power = bss->ni_txpower; 2200 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2201 bad: 2202 ieee80211_free_node(ni); 2203 return ret; 2204 #undef senderr 2205 #undef HTFLAGS 2206 } 2207 2208 /* 2209 * Return an mbuf with a probe response frame in it. 2210 * Space is left to prepend and 802.11 header at the 2211 * front but it's left to the caller to fill in. 2212 */ 2213 struct mbuf * 2214 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2215 { 2216 struct ieee80211vap *vap = bss->ni_vap; 2217 struct ieee80211com *ic = bss->ni_ic; 2218 const struct ieee80211_rateset *rs; 2219 struct mbuf *m; 2220 uint16_t capinfo; 2221 uint8_t *frm; 2222 2223 /* 2224 * probe response frame format 2225 * [8] time stamp 2226 * [2] beacon interval 2227 * [2] cabability information 2228 * [tlv] ssid 2229 * [tlv] supported rates 2230 * [tlv] parameter set (FH/DS) 2231 * [tlv] parameter set (IBSS) 2232 * [tlv] country (optional) 2233 * [3] power control (optional) 2234 * [5] channel switch announcement (CSA) (optional) 2235 * [tlv] extended rate phy (ERP) 2236 * [tlv] extended supported rates 2237 * [tlv] RSN (optional) 2238 * [tlv] HT capabilities 2239 * [tlv] HT information 2240 * [tlv] WPA (optional) 2241 * [tlv] WME (optional) 2242 * [tlv] Vendor OUI HT capabilities (optional) 2243 * [tlv] Vendor OUI HT information (optional) 2244 * [tlv] Atheros capabilities 2245 * [tlv] AppIE's (optional) 2246 * [tlv] Mesh ID (MBSS) 2247 * [tlv] Mesh Conf (MBSS) 2248 */ 2249 m = ieee80211_getmgtframe(&frm, 2250 ic->ic_headroom + sizeof(struct ieee80211_frame), 2251 8 2252 + sizeof(uint16_t) 2253 + sizeof(uint16_t) 2254 + 2 + IEEE80211_NWID_LEN 2255 + 2 + IEEE80211_RATE_SIZE 2256 + 7 /* max(7,3) */ 2257 + IEEE80211_COUNTRY_MAX_SIZE 2258 + 3 2259 + sizeof(struct ieee80211_csa_ie) 2260 + 3 2261 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2262 + sizeof(struct ieee80211_ie_wpa) 2263 + sizeof(struct ieee80211_ie_htcap) 2264 + sizeof(struct ieee80211_ie_htinfo) 2265 + sizeof(struct ieee80211_ie_wpa) 2266 + sizeof(struct ieee80211_wme_param) 2267 + 4 + sizeof(struct ieee80211_ie_htcap) 2268 + 4 + sizeof(struct ieee80211_ie_htinfo) 2269 #ifdef IEEE80211_SUPPORT_SUPERG 2270 + sizeof(struct ieee80211_ath_ie) 2271 #endif 2272 #ifdef IEEE80211_SUPPORT_MESH 2273 + 2 + IEEE80211_MESHID_LEN 2274 + sizeof(struct ieee80211_meshconf_ie) 2275 #endif 2276 + (vap->iv_appie_proberesp != NULL ? 2277 vap->iv_appie_proberesp->ie_len : 0) 2278 ); 2279 if (m == NULL) { 2280 vap->iv_stats.is_tx_nobuf++; 2281 return NULL; 2282 } 2283 2284 memset(frm, 0, 8); /* timestamp should be filled later */ 2285 frm += 8; 2286 *(uint16_t *)frm = htole16(bss->ni_intval); 2287 frm += 2; 2288 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2289 *(uint16_t *)frm = htole16(capinfo); 2290 frm += 2; 2291 2292 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2293 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2294 frm = ieee80211_add_rates(frm, rs); 2295 2296 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2297 *frm++ = IEEE80211_ELEMID_FHPARMS; 2298 *frm++ = 5; 2299 *frm++ = bss->ni_fhdwell & 0x00ff; 2300 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2301 *frm++ = IEEE80211_FH_CHANSET( 2302 ieee80211_chan2ieee(ic, bss->ni_chan)); 2303 *frm++ = IEEE80211_FH_CHANPAT( 2304 ieee80211_chan2ieee(ic, bss->ni_chan)); 2305 *frm++ = bss->ni_fhindex; 2306 } else { 2307 *frm++ = IEEE80211_ELEMID_DSPARMS; 2308 *frm++ = 1; 2309 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2310 } 2311 2312 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2313 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2314 *frm++ = 2; 2315 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2316 } 2317 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2318 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2319 frm = ieee80211_add_countryie(frm, ic); 2320 if (vap->iv_flags & IEEE80211_F_DOTH) { 2321 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2322 frm = ieee80211_add_powerconstraint(frm, vap); 2323 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2324 frm = ieee80211_add_csa(frm, vap); 2325 } 2326 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2327 frm = ieee80211_add_erp(frm, ic); 2328 frm = ieee80211_add_xrates(frm, rs); 2329 if (vap->iv_flags & IEEE80211_F_WPA2) { 2330 if (vap->iv_rsn_ie != NULL) 2331 frm = add_ie(frm, vap->iv_rsn_ie); 2332 /* XXX else complain? */ 2333 } 2334 /* 2335 * NB: legacy 11b clients do not get certain ie's. 2336 * The caller identifies such clients by passing 2337 * a token in legacy to us. Could expand this to be 2338 * any legacy client for stuff like HT ie's. 2339 */ 2340 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2341 legacy != IEEE80211_SEND_LEGACY_11B) { 2342 frm = ieee80211_add_htcap(frm, bss); 2343 frm = ieee80211_add_htinfo(frm, bss); 2344 } 2345 if (vap->iv_flags & IEEE80211_F_WPA1) { 2346 if (vap->iv_wpa_ie != NULL) 2347 frm = add_ie(frm, vap->iv_wpa_ie); 2348 /* XXX else complain? */ 2349 } 2350 if (vap->iv_flags & IEEE80211_F_WME) 2351 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2352 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2353 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2354 legacy != IEEE80211_SEND_LEGACY_11B) { 2355 frm = ieee80211_add_htcap_vendor(frm, bss); 2356 frm = ieee80211_add_htinfo_vendor(frm, bss); 2357 } 2358 #ifdef IEEE80211_SUPPORT_SUPERG 2359 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2360 legacy != IEEE80211_SEND_LEGACY_11B) 2361 frm = ieee80211_add_athcaps(frm, bss); 2362 #endif 2363 if (vap->iv_appie_proberesp != NULL) 2364 frm = add_appie(frm, vap->iv_appie_proberesp); 2365 #ifdef IEEE80211_SUPPORT_MESH 2366 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2367 frm = ieee80211_add_meshid(frm, vap); 2368 frm = ieee80211_add_meshconf(frm, vap); 2369 } 2370 #endif 2371 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2372 2373 return m; 2374 } 2375 2376 /* 2377 * Send a probe response frame to the specified mac address. 2378 * This does not go through the normal mgt frame api so we 2379 * can specify the destination address and re-use the bss node 2380 * for the sta reference. 2381 */ 2382 int 2383 ieee80211_send_proberesp(struct ieee80211vap *vap, 2384 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2385 { 2386 struct ieee80211_node *bss = vap->iv_bss; 2387 struct ieee80211com *ic = vap->iv_ic; 2388 struct mbuf *m; 2389 #ifdef IEEE80211_DEBUG 2390 char ethstr[ETHER_ADDRSTRLEN + 1]; 2391 #endif 2392 2393 if (vap->iv_state == IEEE80211_S_CAC) { 2394 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2395 "block %s frame in CAC state", "probe response"); 2396 vap->iv_stats.is_tx_badstate++; 2397 return EIO; /* XXX */ 2398 } 2399 2400 /* 2401 * Hold a reference on the node so it doesn't go away until after 2402 * the xmit is complete all the way in the driver. On error we 2403 * will remove our reference. 2404 */ 2405 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2406 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2407 __func__, __LINE__, bss, kether_ntoa(bss->ni_macaddr, ethstr), 2408 ieee80211_node_refcnt(bss)+1); 2409 ieee80211_ref_node(bss); 2410 2411 m = ieee80211_alloc_proberesp(bss, legacy); 2412 if (m == NULL) { 2413 ieee80211_free_node(bss); 2414 return ENOMEM; 2415 } 2416 2417 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2418 KASSERT(m != NULL, ("no room for header")); 2419 2420 ieee80211_send_setup(bss, m, 2421 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2422 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2423 /* XXX power management? */ 2424 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2425 2426 M_WME_SETAC(m, WME_AC_BE); 2427 2428 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2429 "send probe resp on channel %u to %s%s\n", 2430 ieee80211_chan2ieee(ic, ic->ic_curchan), kether_ntoa(da, ethstr), 2431 legacy ? " <legacy>" : ""); 2432 IEEE80211_NODE_STAT(bss, tx_mgmt); 2433 2434 return ic->ic_raw_xmit(bss, m, NULL); 2435 } 2436 2437 /* 2438 * Allocate and build a RTS (Request To Send) control frame. 2439 */ 2440 struct mbuf * 2441 ieee80211_alloc_rts(struct ieee80211com *ic, 2442 const uint8_t ra[IEEE80211_ADDR_LEN], 2443 const uint8_t ta[IEEE80211_ADDR_LEN], 2444 uint16_t dur) 2445 { 2446 struct ieee80211_frame_rts *rts; 2447 struct mbuf *m; 2448 2449 /* XXX honor ic_headroom */ 2450 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2451 if (m != NULL) { 2452 rts = mtod(m, struct ieee80211_frame_rts *); 2453 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2454 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2455 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2456 *(u_int16_t *)rts->i_dur = htole16(dur); 2457 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2458 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2459 2460 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2461 } 2462 return m; 2463 } 2464 2465 /* 2466 * Allocate and build a CTS (Clear To Send) control frame. 2467 */ 2468 struct mbuf * 2469 ieee80211_alloc_cts(struct ieee80211com *ic, 2470 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2471 { 2472 struct ieee80211_frame_cts *cts; 2473 struct mbuf *m; 2474 2475 /* XXX honor ic_headroom */ 2476 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2477 if (m != NULL) { 2478 cts = mtod(m, struct ieee80211_frame_cts *); 2479 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2480 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2481 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2482 *(u_int16_t *)cts->i_dur = htole16(dur); 2483 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2484 2485 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2486 } 2487 return m; 2488 } 2489 2490 static void 2491 ieee80211_tx_mgt_timeout_callout(void *arg) 2492 { 2493 struct ieee80211_node *ni = arg; 2494 struct ieee80211vap *vap; 2495 2496 wlan_serialize_enter(); 2497 vap = ni->ni_vap; 2498 if (vap->iv_state != IEEE80211_S_INIT && 2499 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2500 /* 2501 * NB: it's safe to specify a timeout as the reason here; 2502 * it'll only be used in the right state. 2503 */ 2504 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2505 IEEE80211_SCAN_FAIL_TIMEOUT); 2506 } 2507 wlan_serialize_exit(); 2508 } 2509 2510 static void 2511 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2512 { 2513 struct ieee80211vap *vap = ni->ni_vap; 2514 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2515 2516 /* 2517 * Frame transmit completed; arrange timer callback. If 2518 * transmit was successfuly we wait for response. Otherwise 2519 * we arrange an immediate callback instead of doing the 2520 * callback directly since we don't know what state the driver 2521 * is in (e.g. what locks it is holding). This work should 2522 * not be too time-critical and not happen too often so the 2523 * added overhead is acceptable. 2524 * 2525 * XXX what happens if !acked but response shows up before callback? 2526 */ 2527 if (vap->iv_state == ostate) 2528 callout_reset(&vap->iv_mgtsend, 2529 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2530 ieee80211_tx_mgt_timeout_callout, ni); 2531 } 2532 2533 static void 2534 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2535 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2536 { 2537 struct ieee80211vap *vap = ni->ni_vap; 2538 struct ieee80211com *ic = ni->ni_ic; 2539 struct ieee80211_rateset *rs = &ni->ni_rates; 2540 uint16_t capinfo; 2541 2542 /* 2543 * beacon frame format 2544 * [8] time stamp 2545 * [2] beacon interval 2546 * [2] cabability information 2547 * [tlv] ssid 2548 * [tlv] supported rates 2549 * [3] parameter set (DS) 2550 * [8] CF parameter set (optional) 2551 * [tlv] parameter set (IBSS/TIM) 2552 * [tlv] country (optional) 2553 * [3] power control (optional) 2554 * [5] channel switch announcement (CSA) (optional) 2555 * [tlv] extended rate phy (ERP) 2556 * [tlv] extended supported rates 2557 * [tlv] RSN parameters 2558 * [tlv] HT capabilities 2559 * [tlv] HT information 2560 * XXX Vendor-specific OIDs (e.g. Atheros) 2561 * [tlv] WPA parameters 2562 * [tlv] WME parameters 2563 * [tlv] Vendor OUI HT capabilities (optional) 2564 * [tlv] Vendor OUI HT information (optional) 2565 * [tlv] Atheros capabilities (optional) 2566 * [tlv] TDMA parameters (optional) 2567 * [tlv] Mesh ID (MBSS) 2568 * [tlv] Mesh Conf (MBSS) 2569 * [tlv] application data (optional) 2570 */ 2571 2572 memset(bo, 0, sizeof(*bo)); 2573 2574 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2575 frm += 8; 2576 *(uint16_t *)frm = htole16(ni->ni_intval); 2577 frm += 2; 2578 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2579 bo->bo_caps = (uint16_t *)frm; 2580 *(uint16_t *)frm = htole16(capinfo); 2581 frm += 2; 2582 *frm++ = IEEE80211_ELEMID_SSID; 2583 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2584 *frm++ = ni->ni_esslen; 2585 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2586 frm += ni->ni_esslen; 2587 } else 2588 *frm++ = 0; 2589 frm = ieee80211_add_rates(frm, rs); 2590 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2591 *frm++ = IEEE80211_ELEMID_DSPARMS; 2592 *frm++ = 1; 2593 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2594 } 2595 if (ic->ic_flags & IEEE80211_F_PCF) { 2596 bo->bo_cfp = frm; 2597 frm = ieee80211_add_cfparms(frm, ic); 2598 } 2599 bo->bo_tim = frm; 2600 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2601 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2602 *frm++ = 2; 2603 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2604 bo->bo_tim_len = 0; 2605 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2606 vap->iv_opmode == IEEE80211_M_MBSS) { 2607 /* TIM IE is the same for Mesh and Hostap */ 2608 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2609 2610 tie->tim_ie = IEEE80211_ELEMID_TIM; 2611 tie->tim_len = 4; /* length */ 2612 tie->tim_count = 0; /* DTIM count */ 2613 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2614 tie->tim_bitctl = 0; /* bitmap control */ 2615 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2616 frm += sizeof(struct ieee80211_tim_ie); 2617 bo->bo_tim_len = 1; 2618 } 2619 bo->bo_tim_trailer = frm; 2620 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2621 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2622 frm = ieee80211_add_countryie(frm, ic); 2623 if (vap->iv_flags & IEEE80211_F_DOTH) { 2624 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2625 frm = ieee80211_add_powerconstraint(frm, vap); 2626 bo->bo_csa = frm; 2627 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2628 frm = ieee80211_add_csa(frm, vap); 2629 } else 2630 bo->bo_csa = frm; 2631 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2632 bo->bo_erp = frm; 2633 frm = ieee80211_add_erp(frm, ic); 2634 } 2635 frm = ieee80211_add_xrates(frm, rs); 2636 if (vap->iv_flags & IEEE80211_F_WPA2) { 2637 if (vap->iv_rsn_ie != NULL) 2638 frm = add_ie(frm, vap->iv_rsn_ie); 2639 /* XXX else complain */ 2640 } 2641 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2642 frm = ieee80211_add_htcap(frm, ni); 2643 bo->bo_htinfo = frm; 2644 frm = ieee80211_add_htinfo(frm, ni); 2645 } 2646 if (vap->iv_flags & IEEE80211_F_WPA1) { 2647 if (vap->iv_wpa_ie != NULL) 2648 frm = add_ie(frm, vap->iv_wpa_ie); 2649 /* XXX else complain */ 2650 } 2651 if (vap->iv_flags & IEEE80211_F_WME) { 2652 bo->bo_wme = frm; 2653 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2654 } 2655 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2656 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2657 frm = ieee80211_add_htcap_vendor(frm, ni); 2658 frm = ieee80211_add_htinfo_vendor(frm, ni); 2659 } 2660 #ifdef IEEE80211_SUPPORT_SUPERG 2661 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2662 bo->bo_ath = frm; 2663 frm = ieee80211_add_athcaps(frm, ni); 2664 } 2665 #endif 2666 #ifdef IEEE80211_SUPPORT_TDMA 2667 if (vap->iv_caps & IEEE80211_C_TDMA) { 2668 bo->bo_tdma = frm; 2669 frm = ieee80211_add_tdma(frm, vap); 2670 } 2671 #endif 2672 if (vap->iv_appie_beacon != NULL) { 2673 bo->bo_appie = frm; 2674 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2675 frm = add_appie(frm, vap->iv_appie_beacon); 2676 } 2677 #ifdef IEEE80211_SUPPORT_MESH 2678 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2679 frm = ieee80211_add_meshid(frm, vap); 2680 bo->bo_meshconf = frm; 2681 frm = ieee80211_add_meshconf(frm, vap); 2682 } 2683 #endif 2684 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2685 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2686 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2687 } 2688 2689 /* 2690 * Allocate a beacon frame and fillin the appropriate bits. 2691 */ 2692 struct mbuf * 2693 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2694 struct ieee80211_beacon_offsets *bo) 2695 { 2696 struct ieee80211vap *vap = ni->ni_vap; 2697 struct ieee80211com *ic = ni->ni_ic; 2698 struct ifnet *ifp = vap->iv_ifp; 2699 struct ieee80211_frame *wh; 2700 struct mbuf *m; 2701 int pktlen; 2702 uint8_t *frm; 2703 2704 /* 2705 * beacon frame format 2706 * [8] time stamp 2707 * [2] beacon interval 2708 * [2] cabability information 2709 * [tlv] ssid 2710 * [tlv] supported rates 2711 * [3] parameter set (DS) 2712 * [8] CF parameter set (optional) 2713 * [tlv] parameter set (IBSS/TIM) 2714 * [tlv] country (optional) 2715 * [3] power control (optional) 2716 * [5] channel switch announcement (CSA) (optional) 2717 * [tlv] extended rate phy (ERP) 2718 * [tlv] extended supported rates 2719 * [tlv] RSN parameters 2720 * [tlv] HT capabilities 2721 * [tlv] HT information 2722 * [tlv] Vendor OUI HT capabilities (optional) 2723 * [tlv] Vendor OUI HT information (optional) 2724 * XXX Vendor-specific OIDs (e.g. Atheros) 2725 * [tlv] WPA parameters 2726 * [tlv] WME parameters 2727 * [tlv] TDMA parameters (optional) 2728 * [tlv] Mesh ID (MBSS) 2729 * [tlv] Mesh Conf (MBSS) 2730 * [tlv] application data (optional) 2731 * NB: we allocate the max space required for the TIM bitmap. 2732 * XXX how big is this? 2733 */ 2734 pktlen = 8 /* time stamp */ 2735 + sizeof(uint16_t) /* beacon interval */ 2736 + sizeof(uint16_t) /* capabilities */ 2737 + 2 + ni->ni_esslen /* ssid */ 2738 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2739 + 2 + 1 /* DS parameters */ 2740 + 2 + 6 /* CF parameters */ 2741 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2742 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2743 + 2 + 1 /* power control */ 2744 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2745 + 2 + 1 /* ERP */ 2746 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2747 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2748 2*sizeof(struct ieee80211_ie_wpa) : 0) 2749 /* XXX conditional? */ 2750 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2751 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2752 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2753 sizeof(struct ieee80211_wme_param) : 0) 2754 #ifdef IEEE80211_SUPPORT_SUPERG 2755 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2756 #endif 2757 #ifdef IEEE80211_SUPPORT_TDMA 2758 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2759 sizeof(struct ieee80211_tdma_param) : 0) 2760 #endif 2761 #ifdef IEEE80211_SUPPORT_MESH 2762 + 2 + ni->ni_meshidlen 2763 + sizeof(struct ieee80211_meshconf_ie) 2764 #endif 2765 + IEEE80211_MAX_APPIE 2766 ; 2767 m = ieee80211_getmgtframe(&frm, 2768 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2769 if (m == NULL) { 2770 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2771 "%s: cannot get buf; size %u\n", __func__, pktlen); 2772 vap->iv_stats.is_tx_nobuf++; 2773 return NULL; 2774 } 2775 ieee80211_beacon_construct(m, frm, bo, ni); 2776 2777 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2778 KASSERT(m != NULL, ("no space for 802.11 header?")); 2779 wh = mtod(m, struct ieee80211_frame *); 2780 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2781 IEEE80211_FC0_SUBTYPE_BEACON; 2782 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2783 *(uint16_t *)wh->i_dur = 0; 2784 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2785 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2786 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2787 *(uint16_t *)wh->i_seq = 0; 2788 2789 return m; 2790 } 2791 2792 /* 2793 * Update the dynamic parts of a beacon frame based on the current state. 2794 */ 2795 int 2796 ieee80211_beacon_update(struct ieee80211_node *ni, 2797 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2798 { 2799 struct ieee80211vap *vap = ni->ni_vap; 2800 struct ieee80211com *ic = ni->ni_ic; 2801 int len_changed = 0; 2802 uint16_t capinfo; 2803 2804 /* 2805 * Handle 11h channel change when we've reached the count. 2806 * We must recalculate the beacon frame contents to account 2807 * for the new channel. Note we do this only for the first 2808 * vap that reaches this point; subsequent vaps just update 2809 * their beacon state to reflect the recalculated channel. 2810 */ 2811 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2812 vap->iv_csa_count == ic->ic_csa_count) { 2813 vap->iv_csa_count = 0; 2814 /* 2815 * Effect channel change before reconstructing the beacon 2816 * frame contents as many places reference ni_chan. 2817 */ 2818 if (ic->ic_csa_newchan != NULL) 2819 ieee80211_csa_completeswitch(ic); 2820 /* 2821 * NB: ieee80211_beacon_construct clears all pending 2822 * updates in bo_flags so we don't need to explicitly 2823 * clear IEEE80211_BEACON_CSA. 2824 */ 2825 ieee80211_beacon_construct(m, 2826 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2827 2828 /* XXX do WME aggressive mode processing? */ 2829 return 1; /* just assume length changed */ 2830 } 2831 2832 /* XXX faster to recalculate entirely or just changes? */ 2833 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2834 *bo->bo_caps = htole16(capinfo); 2835 2836 if (vap->iv_flags & IEEE80211_F_WME) { 2837 struct ieee80211_wme_state *wme = &ic->ic_wme; 2838 2839 /* 2840 * Check for agressive mode change. When there is 2841 * significant high priority traffic in the BSS 2842 * throttle back BE traffic by using conservative 2843 * parameters. Otherwise BE uses agressive params 2844 * to optimize performance of legacy/non-QoS traffic. 2845 */ 2846 if (wme->wme_flags & WME_F_AGGRMODE) { 2847 if (wme->wme_hipri_traffic > 2848 wme->wme_hipri_switch_thresh) { 2849 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2850 "%s: traffic %u, disable aggressive mode\n", 2851 __func__, wme->wme_hipri_traffic); 2852 wme->wme_flags &= ~WME_F_AGGRMODE; 2853 ieee80211_wme_updateparams_locked(vap); 2854 wme->wme_hipri_traffic = 2855 wme->wme_hipri_switch_hysteresis; 2856 } else 2857 wme->wme_hipri_traffic = 0; 2858 } else { 2859 if (wme->wme_hipri_traffic <= 2860 wme->wme_hipri_switch_thresh) { 2861 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2862 "%s: traffic %u, enable aggressive mode\n", 2863 __func__, wme->wme_hipri_traffic); 2864 wme->wme_flags |= WME_F_AGGRMODE; 2865 ieee80211_wme_updateparams_locked(vap); 2866 wme->wme_hipri_traffic = 0; 2867 } else 2868 wme->wme_hipri_traffic = 2869 wme->wme_hipri_switch_hysteresis; 2870 } 2871 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2872 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2873 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2874 } 2875 } 2876 2877 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2878 ieee80211_ht_update_beacon(vap, bo); 2879 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2880 } 2881 #ifdef IEEE80211_SUPPORT_TDMA 2882 if (vap->iv_caps & IEEE80211_C_TDMA) { 2883 /* 2884 * NB: the beacon is potentially updated every TBTT. 2885 */ 2886 ieee80211_tdma_update_beacon(vap, bo); 2887 } 2888 #endif 2889 #ifdef IEEE80211_SUPPORT_MESH 2890 if (vap->iv_opmode == IEEE80211_M_MBSS) 2891 ieee80211_mesh_update_beacon(vap, bo); 2892 #endif 2893 2894 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2895 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2896 struct ieee80211_tim_ie *tie = 2897 (struct ieee80211_tim_ie *) bo->bo_tim; 2898 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2899 u_int timlen, timoff, i; 2900 /* 2901 * ATIM/DTIM needs updating. If it fits in the 2902 * current space allocated then just copy in the 2903 * new bits. Otherwise we need to move any trailing 2904 * data to make room. Note that we know there is 2905 * contiguous space because ieee80211_beacon_allocate 2906 * insures there is space in the mbuf to write a 2907 * maximal-size virtual bitmap (based on iv_max_aid). 2908 */ 2909 /* 2910 * Calculate the bitmap size and offset, copy any 2911 * trailer out of the way, and then copy in the 2912 * new bitmap and update the information element. 2913 * Note that the tim bitmap must contain at least 2914 * one byte and any offset must be even. 2915 */ 2916 if (vap->iv_ps_pending != 0) { 2917 timoff = 128; /* impossibly large */ 2918 for (i = 0; i < vap->iv_tim_len; i++) 2919 if (vap->iv_tim_bitmap[i]) { 2920 timoff = i &~ 1; 2921 break; 2922 } 2923 KASSERT(timoff != 128, ("tim bitmap empty!")); 2924 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2925 if (vap->iv_tim_bitmap[i]) 2926 break; 2927 timlen = 1 + (i - timoff); 2928 } else { 2929 timoff = 0; 2930 timlen = 1; 2931 } 2932 if (timlen != bo->bo_tim_len) { 2933 /* copy up/down trailer */ 2934 int adjust = tie->tim_bitmap+timlen 2935 - bo->bo_tim_trailer; 2936 ovbcopy(bo->bo_tim_trailer, 2937 bo->bo_tim_trailer+adjust, 2938 bo->bo_tim_trailer_len); 2939 bo->bo_tim_trailer += adjust; 2940 bo->bo_erp += adjust; 2941 bo->bo_htinfo += adjust; 2942 #ifdef IEEE80211_SUPERG_SUPPORT 2943 bo->bo_ath += adjust; 2944 #endif 2945 #ifdef IEEE80211_TDMA_SUPPORT 2946 bo->bo_tdma += adjust; 2947 #endif 2948 #ifdef IEEE80211_MESH_SUPPORT 2949 bo->bo_meshconf += adjust; 2950 #endif 2951 bo->bo_appie += adjust; 2952 bo->bo_wme += adjust; 2953 bo->bo_csa += adjust; 2954 bo->bo_tim_len = timlen; 2955 2956 /* update information element */ 2957 tie->tim_len = 3 + timlen; 2958 tie->tim_bitctl = timoff; 2959 len_changed = 1; 2960 } 2961 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2962 bo->bo_tim_len); 2963 2964 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2965 2966 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2967 "%s: TIM updated, pending %u, off %u, len %u\n", 2968 __func__, vap->iv_ps_pending, timoff, timlen); 2969 } 2970 /* count down DTIM period */ 2971 if (tie->tim_count == 0) 2972 tie->tim_count = tie->tim_period - 1; 2973 else 2974 tie->tim_count--; 2975 /* update state for buffered multicast frames on DTIM */ 2976 if (mcast && tie->tim_count == 0) 2977 tie->tim_bitctl |= 1; 2978 else 2979 tie->tim_bitctl &= ~1; 2980 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2981 struct ieee80211_csa_ie *csa = 2982 (struct ieee80211_csa_ie *) bo->bo_csa; 2983 2984 /* 2985 * Insert or update CSA ie. If we're just starting 2986 * to count down to the channel switch then we need 2987 * to insert the CSA ie. Otherwise we just need to 2988 * drop the count. The actual change happens above 2989 * when the vap's count reaches the target count. 2990 */ 2991 if (vap->iv_csa_count == 0) { 2992 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2993 bo->bo_erp += sizeof(*csa); 2994 bo->bo_htinfo += sizeof(*csa); 2995 bo->bo_wme += sizeof(*csa); 2996 #ifdef IEEE80211_SUPERG_SUPPORT 2997 bo->bo_ath += sizeof(*csa); 2998 #endif 2999 #ifdef IEEE80211_TDMA_SUPPORT 3000 bo->bo_tdma += sizeof(*csa); 3001 #endif 3002 #ifdef IEEE80211_MESH_SUPPORT 3003 bo->bo_meshconf += sizeof(*csa); 3004 #endif 3005 bo->bo_appie += sizeof(*csa); 3006 bo->bo_csa_trailer_len += sizeof(*csa); 3007 bo->bo_tim_trailer_len += sizeof(*csa); 3008 m->m_len += sizeof(*csa); 3009 m->m_pkthdr.len += sizeof(*csa); 3010 3011 ieee80211_add_csa(bo->bo_csa, vap); 3012 } else 3013 csa->csa_count--; 3014 vap->iv_csa_count++; 3015 /* NB: don't clear IEEE80211_BEACON_CSA */ 3016 } 3017 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3018 /* 3019 * ERP element needs updating. 3020 */ 3021 (void) ieee80211_add_erp(bo->bo_erp, ic); 3022 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3023 } 3024 #ifdef IEEE80211_SUPPORT_SUPERG 3025 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3026 ieee80211_add_athcaps(bo->bo_ath, ni); 3027 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3028 } 3029 #endif 3030 } 3031 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3032 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3033 int aielen; 3034 uint8_t *frm; 3035 3036 aielen = 0; 3037 if (aie != NULL) 3038 aielen += aie->ie_len; 3039 if (aielen != bo->bo_appie_len) { 3040 /* copy up/down trailer */ 3041 int adjust = aielen - bo->bo_appie_len; 3042 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3043 bo->bo_tim_trailer_len); 3044 bo->bo_tim_trailer += adjust; 3045 bo->bo_appie += adjust; 3046 bo->bo_appie_len = aielen; 3047 3048 len_changed = 1; 3049 } 3050 frm = bo->bo_appie; 3051 if (aie != NULL) 3052 frm = add_appie(frm, aie); 3053 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3054 } 3055 3056 return len_changed; 3057 } 3058