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sys/net80211/ieee80211_output.c
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1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/9.1/sys/net80211/ieee80211_output.c 231304 2012-02-09 20:57:25Z bz $"); 29 30 #include "opt_inet.h" 31 #include "opt_inet6.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/kernel.h> 38 #include <sys/endian.h> 39 40 #include <sys/socket.h> 41 42 #include <net/bpf.h> 43 #include <net/ethernet.h> 44 #include <net/if.h> 45 #include <net/if_llc.h> 46 #include <net/if_media.h> 47 #include <net/if_vlan_var.h> 48 49 #include <net80211/ieee80211_var.h> 50 #include <net80211/ieee80211_regdomain.h> 51 #ifdef IEEE80211_SUPPORT_SUPERG 52 #include <net80211/ieee80211_superg.h> 53 #endif 54 #ifdef IEEE80211_SUPPORT_TDMA 55 #include <net80211/ieee80211_tdma.h> 56 #endif 57 #include <net80211/ieee80211_wds.h> 58 #include <net80211/ieee80211_mesh.h> 59 60 #if defined(INET) || defined(INET6) 61 #include <netinet/in.h> 62 #endif 63 64 #ifdef INET 65 #include <netinet/if_ether.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/ip.h> 68 #endif 69 #ifdef INET6 70 #include <netinet/ip6.h> 71 #endif 72 73 #include <security/mac/mac_framework.h> 74 75 #define ETHER_HEADER_COPY(dst, src) \ 76 memcpy(dst, src, sizeof(struct ether_header)) 77 78 /* unalligned little endian access */ 79 #define LE_WRITE_2(p, v) do { \ 80 ((uint8_t *)(p))[0] = (v) & 0xff; \ 81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 82 } while (0) 83 #define LE_WRITE_4(p, v) do { \ 84 ((uint8_t *)(p))[0] = (v) & 0xff; \ 85 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 86 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 87 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 88 } while (0) 89 90 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 91 u_int hdrsize, u_int ciphdrsize, u_int mtu); 92 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 93 94 #ifdef IEEE80211_DEBUG 95 /* 96 * Decide if an outbound management frame should be 97 * printed when debugging is enabled. This filters some 98 * of the less interesting frames that come frequently 99 * (e.g. beacons). 100 */ 101 static __inline int 102 doprint(struct ieee80211vap *vap, int subtype) 103 { 104 switch (subtype) { 105 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 106 return (vap->iv_opmode == IEEE80211_M_IBSS); 107 } 108 return 1; 109 } 110 #endif 111 112 /* 113 * Start method for vap's. All packets from the stack come 114 * through here. We handle common processing of the packets 115 * before dispatching them to the underlying device. 116 */ 117 void 118 ieee80211_start(struct ifnet *ifp) 119 { 120 #define IS_DWDS(vap) \ 121 (vap->iv_opmode == IEEE80211_M_WDS && \ 122 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 123 struct ieee80211vap *vap = ifp->if_softc; 124 struct ieee80211com *ic = vap->iv_ic; 125 struct ifnet *parent = ic->ic_ifp; 126 struct ieee80211_node *ni; 127 struct mbuf *m; 128 struct ether_header *eh; 129 int error; 130 131 /* NB: parent must be up and running */ 132 if (!IFNET_IS_UP_RUNNING(parent)) { 133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 134 "%s: ignore queue, parent %s not up+running\n", 135 __func__, parent->if_xname); 136 /* XXX stat */ 137 return; 138 } 139 if (vap->iv_state == IEEE80211_S_SLEEP) { 140 /* 141 * In power save, wakeup device for transmit. 142 */ 143 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 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 IEEE80211_LOCK(ic); 154 /* re-check under the com lock to avoid races */ 155 if (vap->iv_state != IEEE80211_S_RUN) { 156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 157 "%s: ignore queue, in %s state\n", 158 __func__, ieee80211_state_name[vap->iv_state]); 159 vap->iv_stats.is_tx_badstate++; 160 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 161 IEEE80211_UNLOCK(ic); 162 return; 163 } 164 IEEE80211_UNLOCK(ic); 165 } 166 for (;;) { 167 IFQ_DEQUEUE(&ifp->if_snd, m); 168 if (m == NULL) 169 break; 170 /* 171 * Sanitize mbuf flags for net80211 use. We cannot 172 * clear M_PWR_SAV or M_MORE_DATA because these may 173 * be set for frames that are re-submitted from the 174 * power save queue. 175 * 176 * NB: This must be done before ieee80211_classify as 177 * it marks EAPOL in frames with M_EAPOL. 178 */ 179 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 180 /* 181 * Cancel any background scan. 182 */ 183 if (ic->ic_flags & IEEE80211_F_SCAN) 184 ieee80211_cancel_anyscan(vap); 185 /* 186 * Find the node for the destination so we can do 187 * things like power save and fast frames aggregation. 188 * 189 * NB: past this point various code assumes the first 190 * mbuf has the 802.3 header present (and contiguous). 191 */ 192 ni = NULL; 193 if (m->m_len < sizeof(struct ether_header) && 194 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 195 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 196 "discard frame, %s\n", "m_pullup failed"); 197 vap->iv_stats.is_tx_nobuf++; /* XXX */ 198 ifp->if_oerrors++; 199 continue; 200 } 201 eh = mtod(m, struct ether_header *); 202 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 203 if (IS_DWDS(vap)) { 204 /* 205 * Only unicast frames from the above go out 206 * DWDS vaps; multicast frames are handled by 207 * dispatching the frame as it comes through 208 * the AP vap (see below). 209 */ 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 211 eh->ether_dhost, "mcast", "%s", "on DWDS"); 212 vap->iv_stats.is_dwds_mcast++; 213 m_freem(m); 214 continue; 215 } 216 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 217 /* 218 * Spam DWDS vap's w/ multicast traffic. 219 */ 220 /* XXX only if dwds in use? */ 221 ieee80211_dwds_mcast(vap, m); 222 } 223 } 224 #ifdef IEEE80211_SUPPORT_MESH 225 if (vap->iv_opmode != IEEE80211_M_MBSS) { 226 #endif 227 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 228 if (ni == NULL) { 229 /* NB: ieee80211_find_txnode does stat+msg */ 230 ifp->if_oerrors++; 231 m_freem(m); 232 continue; 233 } 234 if (ni->ni_associd == 0 && 235 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 236 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 237 eh->ether_dhost, NULL, 238 "sta not associated (type 0x%04x)", 239 htons(eh->ether_type)); 240 vap->iv_stats.is_tx_notassoc++; 241 ifp->if_oerrors++; 242 m_freem(m); 243 ieee80211_free_node(ni); 244 continue; 245 } 246 #ifdef IEEE80211_SUPPORT_MESH 247 } else { 248 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 249 /* 250 * Proxy station only if configured. 251 */ 252 if (!ieee80211_mesh_isproxyena(vap)) { 253 IEEE80211_DISCARD_MAC(vap, 254 IEEE80211_MSG_OUTPUT | 255 IEEE80211_MSG_MESH, 256 eh->ether_dhost, NULL, 257 "%s", "proxy not enabled"); 258 vap->iv_stats.is_mesh_notproxy++; 259 ifp->if_oerrors++; 260 m_freem(m); 261 continue; 262 } 263 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 264 } 265 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 266 if (ni == NULL) { 267 /* 268 * NB: ieee80211_mesh_discover holds/disposes 269 * frame (e.g. queueing on path discovery). 270 */ 271 ifp->if_oerrors++; 272 continue; 273 } 274 } 275 #endif 276 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 277 (m->m_flags & M_PWR_SAV) == 0) { 278 /* 279 * Station in power save mode; pass the frame 280 * to the 802.11 layer and continue. We'll get 281 * the frame back when the time is right. 282 * XXX lose WDS vap linkage? 283 */ 284 (void) ieee80211_pwrsave(ni, m); 285 ieee80211_free_node(ni); 286 continue; 287 } 288 /* calculate priority so drivers can find the tx queue */ 289 if (ieee80211_classify(ni, m)) { 290 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 291 eh->ether_dhost, NULL, 292 "%s", "classification failure"); 293 vap->iv_stats.is_tx_classify++; 294 ifp->if_oerrors++; 295 m_freem(m); 296 ieee80211_free_node(ni); 297 continue; 298 } 299 /* 300 * Stash the node pointer. Note that we do this after 301 * any call to ieee80211_dwds_mcast because that code 302 * uses any existing value for rcvif to identify the 303 * interface it (might have been) received on. 304 */ 305 m->m_pkthdr.rcvif = (void *)ni; 306 307 BPF_MTAP(ifp, m); /* 802.3 tx */ 308 309 /* 310 * Check if A-MPDU tx aggregation is setup or if we 311 * should try to enable it. The sta must be associated 312 * with HT and A-MPDU enabled for use. When the policy 313 * routine decides we should enable A-MPDU we issue an 314 * ADDBA request and wait for a reply. The frame being 315 * encapsulated will go out w/o using A-MPDU, or possibly 316 * it might be collected by the driver and held/retransmit. 317 * The default ic_ampdu_enable routine handles staggering 318 * ADDBA requests in case the receiver NAK's us or we are 319 * otherwise unable to establish a BA stream. 320 */ 321 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 322 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 323 (m->m_flags & M_EAPOL) == 0) { 324 const int ac = M_WME_GETAC(m); 325 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 326 327 ieee80211_txampdu_count_packet(tap); 328 if (IEEE80211_AMPDU_RUNNING(tap)) { 329 /* 330 * Operational, mark frame for aggregation. 331 * 332 * XXX do tx aggregation here 333 */ 334 m->m_flags |= M_AMPDU_MPDU; 335 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 336 ic->ic_ampdu_enable(ni, tap)) { 337 /* 338 * Not negotiated yet, request service. 339 */ 340 ieee80211_ampdu_request(ni, tap); 341 /* XXX hold frame for reply? */ 342 } 343 } 344 #ifdef IEEE80211_SUPPORT_SUPERG 345 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 346 m = ieee80211_ff_check(ni, m); 347 if (m == NULL) { 348 /* NB: any ni ref held on stageq */ 349 continue; 350 } 351 } 352 #endif /* IEEE80211_SUPPORT_SUPERG */ 353 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 354 /* 355 * Encapsulate the packet in prep for transmission. 356 */ 357 m = ieee80211_encap(vap, ni, m); 358 if (m == NULL) { 359 /* NB: stat+msg handled in ieee80211_encap */ 360 ieee80211_free_node(ni); 361 continue; 362 } 363 } 364 365 error = parent->if_transmit(parent, m); 366 if (error != 0) { 367 /* NB: IFQ_HANDOFF reclaims mbuf */ 368 ieee80211_free_node(ni); 369 } else { 370 ifp->if_opackets++; 371 } 372 ic->ic_lastdata = ticks; 373 } 374 #undef IS_DWDS 375 } 376 377 /* 378 * 802.11 output routine. This is (currently) used only to 379 * connect bpf write calls to the 802.11 layer for injecting 380 * raw 802.11 frames. 381 */ 382 int 383 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 384 struct sockaddr *dst, struct route *ro) 385 { 386 #define senderr(e) do { error = (e); goto bad;} while (0) 387 struct ieee80211_node *ni = NULL; 388 struct ieee80211vap *vap; 389 struct ieee80211_frame *wh; 390 int error; 391 392 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 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, ro); 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 } else if (vap->iv_state == IEEE80211_S_SCAN) 426 senderr(EIO); 427 /* XXX bypass bridge, pfil, carp, etc. */ 428 429 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 430 senderr(EIO); /* XXX */ 431 wh = mtod(m, struct ieee80211_frame *); 432 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 433 IEEE80211_FC0_VERSION_0) 434 senderr(EIO); /* XXX */ 435 436 /* locate destination node */ 437 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 438 case IEEE80211_FC1_DIR_NODS: 439 case IEEE80211_FC1_DIR_FROMDS: 440 ni = ieee80211_find_txnode(vap, wh->i_addr1); 441 break; 442 case IEEE80211_FC1_DIR_TODS: 443 case IEEE80211_FC1_DIR_DSTODS: 444 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 445 senderr(EIO); /* XXX */ 446 ni = ieee80211_find_txnode(vap, wh->i_addr3); 447 break; 448 default: 449 senderr(EIO); /* XXX */ 450 } 451 if (ni == NULL) { 452 /* 453 * Permit packets w/ bpf params through regardless 454 * (see below about sa_len). 455 */ 456 if (dst->sa_len == 0) 457 senderr(EHOSTUNREACH); 458 ni = ieee80211_ref_node(vap->iv_bss); 459 } 460 461 /* 462 * Sanitize mbuf for net80211 flags leaked from above. 463 * 464 * NB: This must be done before ieee80211_classify as 465 * it marks EAPOL in frames with M_EAPOL. 466 */ 467 m->m_flags &= ~M_80211_TX; 468 469 /* calculate priority so drivers can find the tx queue */ 470 /* XXX assumes an 802.3 frame */ 471 if (ieee80211_classify(ni, m)) 472 senderr(EIO); /* XXX */ 473 474 ifp->if_opackets++; 475 IEEE80211_NODE_STAT(ni, tx_data); 476 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 477 IEEE80211_NODE_STAT(ni, tx_mcast); 478 m->m_flags |= M_MCAST; 479 } else 480 IEEE80211_NODE_STAT(ni, tx_ucast); 481 /* NB: ieee80211_encap does not include 802.11 header */ 482 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 483 484 /* 485 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 486 * present by setting the sa_len field of the sockaddr (yes, 487 * this is a hack). 488 * NB: we assume sa_data is suitably aligned to cast. 489 */ 490 return vap->iv_ic->ic_raw_xmit(ni, m, 491 (const struct ieee80211_bpf_params *)(dst->sa_len ? 492 dst->sa_data : NULL)); 493 bad: 494 if (m != NULL) 495 m_freem(m); 496 if (ni != NULL) 497 ieee80211_free_node(ni); 498 ifp->if_oerrors++; 499 return error; 500 #undef senderr 501 } 502 503 /* 504 * Set the direction field and address fields of an outgoing 505 * frame. Note this should be called early on in constructing 506 * a frame as it sets i_fc[1]; other bits can then be or'd in. 507 */ 508 void 509 ieee80211_send_setup( 510 struct ieee80211_node *ni, 511 struct mbuf *m, 512 int type, int tid, 513 const uint8_t sa[IEEE80211_ADDR_LEN], 514 const uint8_t da[IEEE80211_ADDR_LEN], 515 const uint8_t bssid[IEEE80211_ADDR_LEN]) 516 { 517 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 518 struct ieee80211vap *vap = ni->ni_vap; 519 struct ieee80211_tx_ampdu *tap; 520 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 521 ieee80211_seq seqno; 522 523 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 524 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 525 switch (vap->iv_opmode) { 526 case IEEE80211_M_STA: 527 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 528 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 529 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 530 IEEE80211_ADDR_COPY(wh->i_addr3, da); 531 break; 532 case IEEE80211_M_IBSS: 533 case IEEE80211_M_AHDEMO: 534 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 535 IEEE80211_ADDR_COPY(wh->i_addr1, da); 536 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 537 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 538 break; 539 case IEEE80211_M_HOSTAP: 540 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 541 IEEE80211_ADDR_COPY(wh->i_addr1, da); 542 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 543 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 544 break; 545 case IEEE80211_M_WDS: 546 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 547 IEEE80211_ADDR_COPY(wh->i_addr1, da); 548 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 549 IEEE80211_ADDR_COPY(wh->i_addr3, da); 550 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 551 break; 552 case IEEE80211_M_MBSS: 553 #ifdef IEEE80211_SUPPORT_MESH 554 /* XXX add support for proxied addresses */ 555 if (IEEE80211_IS_MULTICAST(da)) { 556 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 557 /* XXX next hop */ 558 IEEE80211_ADDR_COPY(wh->i_addr1, da); 559 IEEE80211_ADDR_COPY(wh->i_addr2, 560 vap->iv_myaddr); 561 } else { 562 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 563 IEEE80211_ADDR_COPY(wh->i_addr1, da); 564 IEEE80211_ADDR_COPY(wh->i_addr2, 565 vap->iv_myaddr); 566 IEEE80211_ADDR_COPY(wh->i_addr3, da); 567 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 568 } 569 #endif 570 break; 571 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 572 break; 573 } 574 } else { 575 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 576 IEEE80211_ADDR_COPY(wh->i_addr1, da); 577 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 578 #ifdef IEEE80211_SUPPORT_MESH 579 if (vap->iv_opmode == IEEE80211_M_MBSS) 580 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 581 else 582 #endif 583 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 584 } 585 *(uint16_t *)&wh->i_dur[0] = 0; 586 587 tap = &ni->ni_tx_ampdu[TID_TO_WME_AC(tid)]; 588 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 589 m->m_flags |= M_AMPDU_MPDU; 590 else { 591 seqno = ni->ni_txseqs[tid]++; 592 *(uint16_t *)&wh->i_seq[0] = 593 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 594 M_SEQNO_SET(m, seqno); 595 } 596 597 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 598 m->m_flags |= M_MCAST; 599 #undef WH4 600 } 601 602 /* 603 * Send a management frame to the specified node. The node pointer 604 * must have a reference as the pointer will be passed to the driver 605 * and potentially held for a long time. If the frame is successfully 606 * dispatched to the driver, then it is responsible for freeing the 607 * reference (and potentially free'ing up any associated storage); 608 * otherwise deal with reclaiming any reference (on error). 609 */ 610 int 611 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 612 struct ieee80211_bpf_params *params) 613 { 614 struct ieee80211vap *vap = ni->ni_vap; 615 struct ieee80211com *ic = ni->ni_ic; 616 struct ieee80211_frame *wh; 617 618 KASSERT(ni != NULL, ("null node")); 619 620 if (vap->iv_state == IEEE80211_S_CAC) { 621 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 622 ni, "block %s frame in CAC state", 623 ieee80211_mgt_subtype_name[ 624 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 625 IEEE80211_FC0_SUBTYPE_SHIFT]); 626 vap->iv_stats.is_tx_badstate++; 627 ieee80211_free_node(ni); 628 m_freem(m); 629 return EIO; /* XXX */ 630 } 631 632 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 633 if (m == NULL) { 634 ieee80211_free_node(ni); 635 return ENOMEM; 636 } 637 638 wh = mtod(m, struct ieee80211_frame *); 639 ieee80211_send_setup(ni, m, 640 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 641 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 642 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 643 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 644 "encrypting frame (%s)", __func__); 645 wh->i_fc[1] |= IEEE80211_FC1_WEP; 646 } 647 m->m_flags |= M_ENCAP; /* mark encapsulated */ 648 649 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 650 M_WME_SETAC(m, params->ibp_pri); 651 652 #ifdef IEEE80211_DEBUG 653 /* avoid printing too many frames */ 654 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 655 ieee80211_msg_dumppkts(vap)) { 656 printf("[%s] send %s on channel %u\n", 657 ether_sprintf(wh->i_addr1), 658 ieee80211_mgt_subtype_name[ 659 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 660 IEEE80211_FC0_SUBTYPE_SHIFT], 661 ieee80211_chan2ieee(ic, ic->ic_curchan)); 662 } 663 #endif 664 IEEE80211_NODE_STAT(ni, tx_mgmt); 665 666 return ic->ic_raw_xmit(ni, m, params); 667 } 668 669 /* 670 * Send a null data frame to the specified node. If the station 671 * is setup for QoS then a QoS Null Data frame is constructed. 672 * If this is a WDS station then a 4-address frame is constructed. 673 * 674 * NB: the caller is assumed to have setup a node reference 675 * for use; this is necessary to deal with a race condition 676 * when probing for inactive stations. Like ieee80211_mgmt_output 677 * we must cleanup any node reference on error; however we 678 * can safely just unref it as we know it will never be the 679 * last reference to the node. 680 */ 681 int 682 ieee80211_send_nulldata(struct ieee80211_node *ni) 683 { 684 struct ieee80211vap *vap = ni->ni_vap; 685 struct ieee80211com *ic = ni->ni_ic; 686 struct mbuf *m; 687 struct ieee80211_frame *wh; 688 int hdrlen; 689 uint8_t *frm; 690 691 if (vap->iv_state == IEEE80211_S_CAC) { 692 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 693 ni, "block %s frame in CAC state", "null data"); 694 ieee80211_unref_node(&ni); 695 vap->iv_stats.is_tx_badstate++; 696 return EIO; /* XXX */ 697 } 698 699 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 700 hdrlen = sizeof(struct ieee80211_qosframe); 701 else 702 hdrlen = sizeof(struct ieee80211_frame); 703 /* NB: only WDS vap's get 4-address frames */ 704 if (vap->iv_opmode == IEEE80211_M_WDS) 705 hdrlen += IEEE80211_ADDR_LEN; 706 if (ic->ic_flags & IEEE80211_F_DATAPAD) 707 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 708 709 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 710 if (m == NULL) { 711 /* XXX debug msg */ 712 ieee80211_unref_node(&ni); 713 vap->iv_stats.is_tx_nobuf++; 714 return ENOMEM; 715 } 716 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 717 ("leading space %zd", M_LEADINGSPACE(m))); 718 M_PREPEND(m, hdrlen, M_DONTWAIT); 719 if (m == NULL) { 720 /* NB: cannot happen */ 721 ieee80211_free_node(ni); 722 return ENOMEM; 723 } 724 725 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 726 if (ni->ni_flags & IEEE80211_NODE_QOS) { 727 const int tid = WME_AC_TO_TID(WME_AC_BE); 728 uint8_t *qos; 729 730 ieee80211_send_setup(ni, m, 731 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 732 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 733 734 if (vap->iv_opmode == IEEE80211_M_WDS) 735 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 736 else 737 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 738 qos[0] = tid & IEEE80211_QOS_TID; 739 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 740 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 741 qos[1] = 0; 742 } else { 743 ieee80211_send_setup(ni, m, 744 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 745 IEEE80211_NONQOS_TID, 746 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 747 } 748 if (vap->iv_opmode != IEEE80211_M_WDS) { 749 /* NB: power management bit is never sent by an AP */ 750 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 751 vap->iv_opmode != IEEE80211_M_HOSTAP) 752 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 753 } 754 m->m_len = m->m_pkthdr.len = hdrlen; 755 m->m_flags |= M_ENCAP; /* mark encapsulated */ 756 757 M_WME_SETAC(m, WME_AC_BE); 758 759 IEEE80211_NODE_STAT(ni, tx_data); 760 761 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 762 "send %snull data frame on channel %u, pwr mgt %s", 763 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 764 ieee80211_chan2ieee(ic, ic->ic_curchan), 765 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 766 767 return ic->ic_raw_xmit(ni, m, NULL); 768 } 769 770 /* 771 * Assign priority to a frame based on any vlan tag assigned 772 * to the station and/or any Diffserv setting in an IP header. 773 * Finally, if an ACM policy is setup (in station mode) it's 774 * applied. 775 */ 776 int 777 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 778 { 779 const struct ether_header *eh = mtod(m, struct ether_header *); 780 int v_wme_ac, d_wme_ac, ac; 781 782 /* 783 * Always promote PAE/EAPOL frames to high priority. 784 */ 785 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 786 /* NB: mark so others don't need to check header */ 787 m->m_flags |= M_EAPOL; 788 ac = WME_AC_VO; 789 goto done; 790 } 791 /* 792 * Non-qos traffic goes to BE. 793 */ 794 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 795 ac = WME_AC_BE; 796 goto done; 797 } 798 799 /* 800 * If node has a vlan tag then all traffic 801 * to it must have a matching tag. 802 */ 803 v_wme_ac = 0; 804 if (ni->ni_vlan != 0) { 805 if ((m->m_flags & M_VLANTAG) == 0) { 806 IEEE80211_NODE_STAT(ni, tx_novlantag); 807 return 1; 808 } 809 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 810 EVL_VLANOFTAG(ni->ni_vlan)) { 811 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 812 return 1; 813 } 814 /* map vlan priority to AC */ 815 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 816 } 817 818 /* XXX m_copydata may be too slow for fast path */ 819 #ifdef INET 820 if (eh->ether_type == htons(ETHERTYPE_IP)) { 821 uint8_t tos; 822 /* 823 * IP frame, map the DSCP bits from the TOS field. 824 */ 825 /* NB: ip header may not be in first mbuf */ 826 m_copydata(m, sizeof(struct ether_header) + 827 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 828 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 829 d_wme_ac = TID_TO_WME_AC(tos); 830 } else { 831 #endif /* INET */ 832 #ifdef INET6 833 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 834 uint32_t flow; 835 uint8_t tos; 836 /* 837 * IPv6 frame, map the DSCP bits from the traffic class field. 838 */ 839 m_copydata(m, sizeof(struct ether_header) + 840 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 841 (caddr_t) &flow); 842 tos = (uint8_t)(ntohl(flow) >> 20); 843 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 844 d_wme_ac = TID_TO_WME_AC(tos); 845 } else { 846 #endif /* INET6 */ 847 d_wme_ac = WME_AC_BE; 848 #ifdef INET6 849 } 850 #endif 851 #ifdef INET 852 } 853 #endif 854 /* 855 * Use highest priority AC. 856 */ 857 if (v_wme_ac > d_wme_ac) 858 ac = v_wme_ac; 859 else 860 ac = d_wme_ac; 861 862 /* 863 * Apply ACM policy. 864 */ 865 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 866 static const int acmap[4] = { 867 WME_AC_BK, /* WME_AC_BE */ 868 WME_AC_BK, /* WME_AC_BK */ 869 WME_AC_BE, /* WME_AC_VI */ 870 WME_AC_VI, /* WME_AC_VO */ 871 }; 872 struct ieee80211com *ic = ni->ni_ic; 873 874 while (ac != WME_AC_BK && 875 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 876 ac = acmap[ac]; 877 } 878 done: 879 M_WME_SETAC(m, ac); 880 return 0; 881 } 882 883 /* 884 * Insure there is sufficient contiguous space to encapsulate the 885 * 802.11 data frame. If room isn't already there, arrange for it. 886 * Drivers and cipher modules assume we have done the necessary work 887 * and fail rudely if they don't find the space they need. 888 */ 889 struct mbuf * 890 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 891 struct ieee80211_key *key, struct mbuf *m) 892 { 893 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 894 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 895 896 if (key != NULL) { 897 /* XXX belongs in crypto code? */ 898 needed_space += key->wk_cipher->ic_header; 899 /* XXX frags */ 900 /* 901 * When crypto is being done in the host we must insure 902 * the data are writable for the cipher routines; clone 903 * a writable mbuf chain. 904 * XXX handle SWMIC specially 905 */ 906 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 907 m = m_unshare(m, M_NOWAIT); 908 if (m == NULL) { 909 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 910 "%s: cannot get writable mbuf\n", __func__); 911 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 912 return NULL; 913 } 914 } 915 } 916 /* 917 * We know we are called just before stripping an Ethernet 918 * header and prepending an LLC header. This means we know 919 * there will be 920 * sizeof(struct ether_header) - sizeof(struct llc) 921 * bytes recovered to which we need additional space for the 922 * 802.11 header and any crypto header. 923 */ 924 /* XXX check trailing space and copy instead? */ 925 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 926 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 927 if (n == NULL) { 928 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 929 "%s: cannot expand storage\n", __func__); 930 vap->iv_stats.is_tx_nobuf++; 931 m_freem(m); 932 return NULL; 933 } 934 KASSERT(needed_space <= MHLEN, 935 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 936 /* 937 * Setup new mbuf to have leading space to prepend the 938 * 802.11 header and any crypto header bits that are 939 * required (the latter are added when the driver calls 940 * back to ieee80211_crypto_encap to do crypto encapsulation). 941 */ 942 /* NB: must be first 'cuz it clobbers m_data */ 943 m_move_pkthdr(n, m); 944 n->m_len = 0; /* NB: m_gethdr does not set */ 945 n->m_data += needed_space; 946 /* 947 * Pull up Ethernet header to create the expected layout. 948 * We could use m_pullup but that's overkill (i.e. we don't 949 * need the actual data) and it cannot fail so do it inline 950 * for speed. 951 */ 952 /* NB: struct ether_header is known to be contiguous */ 953 n->m_len += sizeof(struct ether_header); 954 m->m_len -= sizeof(struct ether_header); 955 m->m_data += sizeof(struct ether_header); 956 /* 957 * Replace the head of the chain. 958 */ 959 n->m_next = m; 960 m = n; 961 } 962 return m; 963 #undef TO_BE_RECLAIMED 964 } 965 966 /* 967 * Return the transmit key to use in sending a unicast frame. 968 * If a unicast key is set we use that. When no unicast key is set 969 * we fall back to the default transmit key. 970 */ 971 static __inline struct ieee80211_key * 972 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 973 struct ieee80211_node *ni) 974 { 975 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 976 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 977 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 978 return NULL; 979 return &vap->iv_nw_keys[vap->iv_def_txkey]; 980 } else { 981 return &ni->ni_ucastkey; 982 } 983 } 984 985 /* 986 * Return the transmit key to use in sending a multicast frame. 987 * Multicast traffic always uses the group key which is installed as 988 * the default tx key. 989 */ 990 static __inline struct ieee80211_key * 991 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 992 struct ieee80211_node *ni) 993 { 994 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 995 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 996 return NULL; 997 return &vap->iv_nw_keys[vap->iv_def_txkey]; 998 } 999 1000 /* 1001 * Encapsulate an outbound data frame. The mbuf chain is updated. 1002 * If an error is encountered NULL is returned. The caller is required 1003 * to provide a node reference and pullup the ethernet header in the 1004 * first mbuf. 1005 * 1006 * NB: Packet is assumed to be processed by ieee80211_classify which 1007 * marked EAPOL frames w/ M_EAPOL. 1008 */ 1009 struct mbuf * 1010 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1011 struct mbuf *m) 1012 { 1013 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1014 struct ieee80211com *ic = ni->ni_ic; 1015 #ifdef IEEE80211_SUPPORT_MESH 1016 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1017 struct ieee80211_meshcntl_ae10 *mc; 1018 #endif 1019 struct ether_header eh; 1020 struct ieee80211_frame *wh; 1021 struct ieee80211_key *key; 1022 struct llc *llc; 1023 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1024 ieee80211_seq seqno; 1025 int meshhdrsize, meshae; 1026 uint8_t *qos; 1027 1028 /* 1029 * Copy existing Ethernet header to a safe place. The 1030 * rest of the code assumes it's ok to strip it when 1031 * reorganizing state for the final encapsulation. 1032 */ 1033 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1034 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1035 1036 /* 1037 * Insure space for additional headers. First identify 1038 * transmit key to use in calculating any buffer adjustments 1039 * required. This is also used below to do privacy 1040 * encapsulation work. Then calculate the 802.11 header 1041 * size and any padding required by the driver. 1042 * 1043 * Note key may be NULL if we fall back to the default 1044 * transmit key and that is not set. In that case the 1045 * buffer may not be expanded as needed by the cipher 1046 * routines, but they will/should discard it. 1047 */ 1048 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1049 if (vap->iv_opmode == IEEE80211_M_STA || 1050 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1051 (vap->iv_opmode == IEEE80211_M_WDS && 1052 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1053 key = ieee80211_crypto_getucastkey(vap, ni); 1054 else 1055 key = ieee80211_crypto_getmcastkey(vap, ni); 1056 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1057 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1058 eh.ether_dhost, 1059 "no default transmit key (%s) deftxkey %u", 1060 __func__, vap->iv_def_txkey); 1061 vap->iv_stats.is_tx_nodefkey++; 1062 goto bad; 1063 } 1064 } else 1065 key = NULL; 1066 /* 1067 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1068 * frames so suppress use. This may be an issue if other 1069 * ap's require all data frames to be QoS-encapsulated 1070 * once negotiated in which case we'll need to make this 1071 * configurable. 1072 */ 1073 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1074 (m->m_flags & M_EAPOL) == 0; 1075 if (addqos) 1076 hdrsize = sizeof(struct ieee80211_qosframe); 1077 else 1078 hdrsize = sizeof(struct ieee80211_frame); 1079 #ifdef IEEE80211_SUPPORT_MESH 1080 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1081 /* 1082 * Mesh data frames are encapsulated according to the 1083 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1084 * o Group Addressed data (aka multicast) originating 1085 * at the local sta are sent w/ 3-address format and 1086 * address extension mode 00 1087 * o Individually Addressed data (aka unicast) originating 1088 * at the local sta are sent w/ 4-address format and 1089 * address extension mode 00 1090 * o Group Addressed data forwarded from a non-mesh sta are 1091 * sent w/ 3-address format and address extension mode 01 1092 * o Individually Address data from another sta are sent 1093 * w/ 4-address format and address extension mode 10 1094 */ 1095 is4addr = 0; /* NB: don't use, disable */ 1096 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1097 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1098 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1099 /* XXX defines for AE modes */ 1100 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1101 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1102 meshae = 0; 1103 else 1104 meshae = 4; /* NB: pseudo */ 1105 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1106 meshae = 1; 1107 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1108 } else { 1109 meshae = 2; 1110 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1111 } 1112 } else { 1113 #endif 1114 /* 1115 * 4-address frames need to be generated for: 1116 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1117 * o packets sent through a vap marked for relaying 1118 * (e.g. a station operating with dynamic WDS) 1119 */ 1120 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1121 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1122 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1123 if (is4addr) 1124 hdrsize += IEEE80211_ADDR_LEN; 1125 meshhdrsize = meshae = 0; 1126 #ifdef IEEE80211_SUPPORT_MESH 1127 } 1128 #endif 1129 /* 1130 * Honor driver DATAPAD requirement. 1131 */ 1132 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1133 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1134 else 1135 hdrspace = hdrsize; 1136 1137 if (__predict_true((m->m_flags & M_FF) == 0)) { 1138 /* 1139 * Normal frame. 1140 */ 1141 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1142 if (m == NULL) { 1143 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1144 goto bad; 1145 } 1146 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1147 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1148 llc = mtod(m, struct llc *); 1149 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1150 llc->llc_control = LLC_UI; 1151 llc->llc_snap.org_code[0] = 0; 1152 llc->llc_snap.org_code[1] = 0; 1153 llc->llc_snap.org_code[2] = 0; 1154 llc->llc_snap.ether_type = eh.ether_type; 1155 } else { 1156 #ifdef IEEE80211_SUPPORT_SUPERG 1157 /* 1158 * Aggregated frame. 1159 */ 1160 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1161 if (m == NULL) 1162 #endif 1163 goto bad; 1164 } 1165 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1166 1167 M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT); 1168 if (m == NULL) { 1169 vap->iv_stats.is_tx_nobuf++; 1170 goto bad; 1171 } 1172 wh = mtod(m, struct ieee80211_frame *); 1173 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1174 *(uint16_t *)wh->i_dur = 0; 1175 qos = NULL; /* NB: quiet compiler */ 1176 if (is4addr) { 1177 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1178 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1179 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1180 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1181 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1182 } else switch (vap->iv_opmode) { 1183 case IEEE80211_M_STA: 1184 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1185 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1186 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1187 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1188 break; 1189 case IEEE80211_M_IBSS: 1190 case IEEE80211_M_AHDEMO: 1191 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1192 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1193 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1194 /* 1195 * NB: always use the bssid from iv_bss as the 1196 * neighbor's may be stale after an ibss merge 1197 */ 1198 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1199 break; 1200 case IEEE80211_M_HOSTAP: 1201 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1202 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1203 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1204 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1205 break; 1206 #ifdef IEEE80211_SUPPORT_MESH 1207 case IEEE80211_M_MBSS: 1208 /* NB: offset by hdrspace to deal with DATAPAD */ 1209 mc = (struct ieee80211_meshcntl_ae10 *) 1210 (mtod(m, uint8_t *) + hdrspace); 1211 switch (meshae) { 1212 case 0: /* ucast, no proxy */ 1213 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1214 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1215 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1216 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1217 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1218 mc->mc_flags = 0; 1219 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1220 break; 1221 case 4: /* mcast, no proxy */ 1222 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1223 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1224 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1225 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1226 mc->mc_flags = 0; /* NB: AE is really 0 */ 1227 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1228 break; 1229 case 1: /* mcast, proxy */ 1230 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1231 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1232 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1233 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1234 mc->mc_flags = 1; 1235 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1236 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1237 break; 1238 case 2: /* ucast, proxy */ 1239 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1240 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1241 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1242 /* XXX not right, need MeshDA */ 1243 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1244 /* XXX assume are MeshSA */ 1245 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1246 mc->mc_flags = 2; 1247 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1248 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1249 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1250 break; 1251 default: 1252 KASSERT(0, ("meshae %d", meshae)); 1253 break; 1254 } 1255 mc->mc_ttl = ms->ms_ttl; 1256 ms->ms_seq++; 1257 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1258 break; 1259 #endif 1260 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1261 default: 1262 goto bad; 1263 } 1264 if (m->m_flags & M_MORE_DATA) 1265 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1266 if (addqos) { 1267 int ac, tid; 1268 1269 if (is4addr) { 1270 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1271 /* NB: mesh case handled earlier */ 1272 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1273 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1274 ac = M_WME_GETAC(m); 1275 /* map from access class/queue to 11e header priorty value */ 1276 tid = WME_AC_TO_TID(ac); 1277 qos[0] = tid & IEEE80211_QOS_TID; 1278 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1279 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1280 qos[1] = 0; 1281 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1282 1283 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1284 /* 1285 * NB: don't assign a sequence # to potential 1286 * aggregates; we expect this happens at the 1287 * point the frame comes off any aggregation q 1288 * as otherwise we may introduce holes in the 1289 * BA sequence space and/or make window accouting 1290 * more difficult. 1291 * 1292 * XXX may want to control this with a driver 1293 * capability; this may also change when we pull 1294 * aggregation up into net80211 1295 */ 1296 seqno = ni->ni_txseqs[tid]++; 1297 *(uint16_t *)wh->i_seq = 1298 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1299 M_SEQNO_SET(m, seqno); 1300 } 1301 } else { 1302 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1303 *(uint16_t *)wh->i_seq = 1304 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1305 M_SEQNO_SET(m, seqno); 1306 } 1307 1308 1309 /* check if xmit fragmentation is required */ 1310 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1311 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1312 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1313 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1314 if (key != NULL) { 1315 /* 1316 * IEEE 802.1X: send EAPOL frames always in the clear. 1317 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1318 */ 1319 if ((m->m_flags & M_EAPOL) == 0 || 1320 ((vap->iv_flags & IEEE80211_F_WPA) && 1321 (vap->iv_opmode == IEEE80211_M_STA ? 1322 !IEEE80211_KEY_UNDEFINED(key) : 1323 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1324 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1325 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1326 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1327 eh.ether_dhost, 1328 "%s", "enmic failed, discard frame"); 1329 vap->iv_stats.is_crypto_enmicfail++; 1330 goto bad; 1331 } 1332 } 1333 } 1334 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1335 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1336 goto bad; 1337 1338 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1339 1340 IEEE80211_NODE_STAT(ni, tx_data); 1341 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1342 IEEE80211_NODE_STAT(ni, tx_mcast); 1343 m->m_flags |= M_MCAST; 1344 } else 1345 IEEE80211_NODE_STAT(ni, tx_ucast); 1346 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1347 1348 return m; 1349 bad: 1350 if (m != NULL) 1351 m_freem(m); 1352 return NULL; 1353 #undef WH4 1354 } 1355 1356 /* 1357 * Fragment the frame according to the specified mtu. 1358 * The size of the 802.11 header (w/o padding) is provided 1359 * so we don't need to recalculate it. We create a new 1360 * mbuf for each fragment and chain it through m_nextpkt; 1361 * we might be able to optimize this by reusing the original 1362 * packet's mbufs but that is significantly more complicated. 1363 */ 1364 static int 1365 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1366 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1367 { 1368 struct ieee80211_frame *wh, *whf; 1369 struct mbuf *m, *prev, *next; 1370 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1371 1372 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1373 KASSERT(m0->m_pkthdr.len > mtu, 1374 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1375 1376 wh = mtod(m0, struct ieee80211_frame *); 1377 /* NB: mark the first frag; it will be propagated below */ 1378 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1379 totalhdrsize = hdrsize + ciphdrsize; 1380 fragno = 1; 1381 off = mtu - ciphdrsize; 1382 remainder = m0->m_pkthdr.len - off; 1383 prev = m0; 1384 do { 1385 fragsize = totalhdrsize + remainder; 1386 if (fragsize > mtu) 1387 fragsize = mtu; 1388 /* XXX fragsize can be >2048! */ 1389 KASSERT(fragsize < MCLBYTES, 1390 ("fragment size %u too big!", fragsize)); 1391 if (fragsize > MHLEN) 1392 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1393 else 1394 m = m_gethdr(M_DONTWAIT, MT_DATA); 1395 if (m == NULL) 1396 goto bad; 1397 /* leave room to prepend any cipher header */ 1398 m_align(m, fragsize - ciphdrsize); 1399 1400 /* 1401 * Form the header in the fragment. Note that since 1402 * we mark the first fragment with the MORE_FRAG bit 1403 * it automatically is propagated to each fragment; we 1404 * need only clear it on the last fragment (done below). 1405 */ 1406 whf = mtod(m, struct ieee80211_frame *); 1407 memcpy(whf, wh, hdrsize); 1408 *(uint16_t *)&whf->i_seq[0] |= htole16( 1409 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1410 IEEE80211_SEQ_FRAG_SHIFT); 1411 fragno++; 1412 1413 payload = fragsize - totalhdrsize; 1414 /* NB: destination is known to be contiguous */ 1415 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1416 m->m_len = hdrsize + payload; 1417 m->m_pkthdr.len = hdrsize + payload; 1418 m->m_flags |= M_FRAG; 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 free(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 struct ieee80211_frame *wh; 1723 const struct ieee80211_rateset *rs; 1724 struct mbuf *m; 1725 uint8_t *frm; 1726 1727 if (vap->iv_state == IEEE80211_S_CAC) { 1728 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1729 "block %s frame in CAC state", "probe request"); 1730 vap->iv_stats.is_tx_badstate++; 1731 return EIO; /* XXX */ 1732 } 1733 1734 /* 1735 * Hold a reference on the node so it doesn't go away until after 1736 * the xmit is complete all the way in the driver. On error we 1737 * will remove our reference. 1738 */ 1739 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1740 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1741 __func__, __LINE__, 1742 ni, ether_sprintf(ni->ni_macaddr), 1743 ieee80211_node_refcnt(ni)+1); 1744 ieee80211_ref_node(ni); 1745 1746 /* 1747 * prreq frame format 1748 * [tlv] ssid 1749 * [tlv] supported rates 1750 * [tlv] RSN (optional) 1751 * [tlv] extended supported rates 1752 * [tlv] WPA (optional) 1753 * [tlv] user-specified ie's 1754 */ 1755 m = ieee80211_getmgtframe(&frm, 1756 ic->ic_headroom + sizeof(struct ieee80211_frame), 1757 2 + IEEE80211_NWID_LEN 1758 + 2 + IEEE80211_RATE_SIZE 1759 + sizeof(struct ieee80211_ie_wpa) 1760 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1761 + sizeof(struct ieee80211_ie_wpa) 1762 + (vap->iv_appie_probereq != NULL ? 1763 vap->iv_appie_probereq->ie_len : 0) 1764 ); 1765 if (m == NULL) { 1766 vap->iv_stats.is_tx_nobuf++; 1767 ieee80211_free_node(ni); 1768 return ENOMEM; 1769 } 1770 1771 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1772 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1773 frm = ieee80211_add_rates(frm, rs); 1774 if (vap->iv_flags & IEEE80211_F_WPA2) { 1775 if (vap->iv_rsn_ie != NULL) 1776 frm = add_ie(frm, vap->iv_rsn_ie); 1777 /* XXX else complain? */ 1778 } 1779 frm = ieee80211_add_xrates(frm, rs); 1780 if (vap->iv_flags & IEEE80211_F_WPA1) { 1781 if (vap->iv_wpa_ie != NULL) 1782 frm = add_ie(frm, vap->iv_wpa_ie); 1783 /* XXX else complain? */ 1784 } 1785 if (vap->iv_appie_probereq != NULL) 1786 frm = add_appie(frm, vap->iv_appie_probereq); 1787 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1788 1789 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1790 ("leading space %zd", M_LEADINGSPACE(m))); 1791 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1792 if (m == NULL) { 1793 /* NB: cannot happen */ 1794 ieee80211_free_node(ni); 1795 return ENOMEM; 1796 } 1797 1798 wh = mtod(m, struct ieee80211_frame *); 1799 ieee80211_send_setup(ni, m, 1800 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1801 IEEE80211_NONQOS_TID, sa, da, bssid); 1802 /* XXX power management? */ 1803 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1804 1805 M_WME_SETAC(m, WME_AC_BE); 1806 1807 IEEE80211_NODE_STAT(ni, tx_probereq); 1808 IEEE80211_NODE_STAT(ni, tx_mgmt); 1809 1810 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1811 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1812 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1813 ssidlen, ssid); 1814 1815 memset(¶ms, 0, sizeof(params)); 1816 params.ibp_pri = M_WME_GETAC(m); 1817 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1818 params.ibp_rate0 = tp->mgmtrate; 1819 if (IEEE80211_IS_MULTICAST(da)) { 1820 params.ibp_flags |= IEEE80211_BPF_NOACK; 1821 params.ibp_try0 = 1; 1822 } else 1823 params.ibp_try0 = tp->maxretry; 1824 params.ibp_power = ni->ni_txpower; 1825 return ic->ic_raw_xmit(ni, m, ¶ms); 1826 } 1827 1828 /* 1829 * Calculate capability information for mgt frames. 1830 */ 1831 uint16_t 1832 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1833 { 1834 struct ieee80211com *ic = vap->iv_ic; 1835 uint16_t capinfo; 1836 1837 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1838 1839 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1840 capinfo = IEEE80211_CAPINFO_ESS; 1841 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1842 capinfo = IEEE80211_CAPINFO_IBSS; 1843 else 1844 capinfo = 0; 1845 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1846 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1847 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1848 IEEE80211_IS_CHAN_2GHZ(chan)) 1849 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1850 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1851 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1852 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1853 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1854 return capinfo; 1855 } 1856 1857 /* 1858 * Send a management frame. The node is for the destination (or ic_bss 1859 * when in station mode). Nodes other than ic_bss have their reference 1860 * count bumped to reflect our use for an indeterminant time. 1861 */ 1862 int 1863 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1864 { 1865 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1866 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1867 struct ieee80211vap *vap = ni->ni_vap; 1868 struct ieee80211com *ic = ni->ni_ic; 1869 struct ieee80211_node *bss = vap->iv_bss; 1870 struct ieee80211_bpf_params params; 1871 struct mbuf *m; 1872 uint8_t *frm; 1873 uint16_t capinfo; 1874 int has_challenge, is_shared_key, ret, status; 1875 1876 KASSERT(ni != NULL, ("null node")); 1877 1878 /* 1879 * Hold a reference on the node so it doesn't go away until after 1880 * the xmit is complete all the way in the driver. On error we 1881 * will remove our reference. 1882 */ 1883 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1884 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1885 __func__, __LINE__, 1886 ni, ether_sprintf(ni->ni_macaddr), 1887 ieee80211_node_refcnt(ni)+1); 1888 ieee80211_ref_node(ni); 1889 1890 memset(¶ms, 0, sizeof(params)); 1891 switch (type) { 1892 1893 case IEEE80211_FC0_SUBTYPE_AUTH: 1894 status = arg >> 16; 1895 arg &= 0xffff; 1896 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1897 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1898 ni->ni_challenge != NULL); 1899 1900 /* 1901 * Deduce whether we're doing open authentication or 1902 * shared key authentication. We do the latter if 1903 * we're in the middle of a shared key authentication 1904 * handshake or if we're initiating an authentication 1905 * request and configured to use shared key. 1906 */ 1907 is_shared_key = has_challenge || 1908 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1909 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1910 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1911 1912 m = ieee80211_getmgtframe(&frm, 1913 ic->ic_headroom + sizeof(struct ieee80211_frame), 1914 3 * sizeof(uint16_t) 1915 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1916 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1917 ); 1918 if (m == NULL) 1919 senderr(ENOMEM, is_tx_nobuf); 1920 1921 ((uint16_t *)frm)[0] = 1922 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1923 : htole16(IEEE80211_AUTH_ALG_OPEN); 1924 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1925 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1926 1927 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1928 ((uint16_t *)frm)[3] = 1929 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1930 IEEE80211_ELEMID_CHALLENGE); 1931 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1932 IEEE80211_CHALLENGE_LEN); 1933 m->m_pkthdr.len = m->m_len = 1934 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1935 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1936 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1937 "request encrypt frame (%s)", __func__); 1938 /* mark frame for encryption */ 1939 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1940 } 1941 } else 1942 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1943 1944 /* XXX not right for shared key */ 1945 if (status == IEEE80211_STATUS_SUCCESS) 1946 IEEE80211_NODE_STAT(ni, tx_auth); 1947 else 1948 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1949 1950 if (vap->iv_opmode == IEEE80211_M_STA) 1951 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1952 (void *) vap->iv_state); 1953 break; 1954 1955 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1956 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1957 "send station deauthenticate (reason %d)", arg); 1958 m = ieee80211_getmgtframe(&frm, 1959 ic->ic_headroom + sizeof(struct ieee80211_frame), 1960 sizeof(uint16_t)); 1961 if (m == NULL) 1962 senderr(ENOMEM, is_tx_nobuf); 1963 *(uint16_t *)frm = htole16(arg); /* reason */ 1964 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1965 1966 IEEE80211_NODE_STAT(ni, tx_deauth); 1967 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1968 1969 ieee80211_node_unauthorize(ni); /* port closed */ 1970 break; 1971 1972 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1973 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1974 /* 1975 * asreq frame format 1976 * [2] capability information 1977 * [2] listen interval 1978 * [6*] current AP address (reassoc only) 1979 * [tlv] ssid 1980 * [tlv] supported rates 1981 * [tlv] extended supported rates 1982 * [4] power capability (optional) 1983 * [28] supported channels (optional) 1984 * [tlv] HT capabilities 1985 * [tlv] WME (optional) 1986 * [tlv] Vendor OUI HT capabilities (optional) 1987 * [tlv] Atheros capabilities (if negotiated) 1988 * [tlv] AppIE's (optional) 1989 */ 1990 m = ieee80211_getmgtframe(&frm, 1991 ic->ic_headroom + sizeof(struct ieee80211_frame), 1992 sizeof(uint16_t) 1993 + sizeof(uint16_t) 1994 + IEEE80211_ADDR_LEN 1995 + 2 + IEEE80211_NWID_LEN 1996 + 2 + IEEE80211_RATE_SIZE 1997 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1998 + 4 1999 + 2 + 26 2000 + sizeof(struct ieee80211_wme_info) 2001 + sizeof(struct ieee80211_ie_htcap) 2002 + 4 + sizeof(struct ieee80211_ie_htcap) 2003 #ifdef IEEE80211_SUPPORT_SUPERG 2004 + sizeof(struct ieee80211_ath_ie) 2005 #endif 2006 + (vap->iv_appie_wpa != NULL ? 2007 vap->iv_appie_wpa->ie_len : 0) 2008 + (vap->iv_appie_assocreq != NULL ? 2009 vap->iv_appie_assocreq->ie_len : 0) 2010 ); 2011 if (m == NULL) 2012 senderr(ENOMEM, is_tx_nobuf); 2013 2014 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2015 ("wrong mode %u", vap->iv_opmode)); 2016 capinfo = IEEE80211_CAPINFO_ESS; 2017 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2018 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2019 /* 2020 * NB: Some 11a AP's reject the request when 2021 * short premable is set. 2022 */ 2023 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2024 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2025 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2026 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2027 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2028 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2029 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2030 (vap->iv_flags & IEEE80211_F_DOTH)) 2031 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2032 *(uint16_t *)frm = htole16(capinfo); 2033 frm += 2; 2034 2035 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2036 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2037 bss->ni_intval)); 2038 frm += 2; 2039 2040 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2041 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2042 frm += IEEE80211_ADDR_LEN; 2043 } 2044 2045 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2046 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2047 if (vap->iv_flags & IEEE80211_F_WPA2) { 2048 if (vap->iv_rsn_ie != NULL) 2049 frm = add_ie(frm, vap->iv_rsn_ie); 2050 /* XXX else complain? */ 2051 } 2052 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2053 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2054 frm = ieee80211_add_powercapability(frm, 2055 ic->ic_curchan); 2056 frm = ieee80211_add_supportedchannels(frm, ic); 2057 } 2058 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2059 ni->ni_ies.htcap_ie != NULL && 2060 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2061 frm = ieee80211_add_htcap(frm, ni); 2062 if (vap->iv_flags & IEEE80211_F_WPA1) { 2063 if (vap->iv_wpa_ie != NULL) 2064 frm = add_ie(frm, vap->iv_wpa_ie); 2065 /* XXX else complain */ 2066 } 2067 if ((ic->ic_flags & IEEE80211_F_WME) && 2068 ni->ni_ies.wme_ie != NULL) 2069 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2070 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2071 ni->ni_ies.htcap_ie != NULL && 2072 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2073 frm = ieee80211_add_htcap_vendor(frm, ni); 2074 #ifdef IEEE80211_SUPPORT_SUPERG 2075 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2076 frm = ieee80211_add_ath(frm, 2077 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2078 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2079 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2080 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2081 } 2082 #endif /* IEEE80211_SUPPORT_SUPERG */ 2083 if (vap->iv_appie_assocreq != NULL) 2084 frm = add_appie(frm, vap->iv_appie_assocreq); 2085 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2086 2087 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2088 (void *) vap->iv_state); 2089 break; 2090 2091 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2092 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2093 /* 2094 * asresp frame format 2095 * [2] capability information 2096 * [2] status 2097 * [2] association ID 2098 * [tlv] supported rates 2099 * [tlv] extended supported rates 2100 * [tlv] HT capabilities (standard, if STA enabled) 2101 * [tlv] HT information (standard, if STA enabled) 2102 * [tlv] WME (if configured and STA enabled) 2103 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2104 * [tlv] HT information (vendor OUI, if STA enabled) 2105 * [tlv] Atheros capabilities (if STA enabled) 2106 * [tlv] AppIE's (optional) 2107 */ 2108 m = ieee80211_getmgtframe(&frm, 2109 ic->ic_headroom + sizeof(struct ieee80211_frame), 2110 sizeof(uint16_t) 2111 + sizeof(uint16_t) 2112 + sizeof(uint16_t) 2113 + 2 + IEEE80211_RATE_SIZE 2114 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2115 + sizeof(struct ieee80211_ie_htcap) + 4 2116 + sizeof(struct ieee80211_ie_htinfo) + 4 2117 + sizeof(struct ieee80211_wme_param) 2118 #ifdef IEEE80211_SUPPORT_SUPERG 2119 + sizeof(struct ieee80211_ath_ie) 2120 #endif 2121 + (vap->iv_appie_assocresp != NULL ? 2122 vap->iv_appie_assocresp->ie_len : 0) 2123 ); 2124 if (m == NULL) 2125 senderr(ENOMEM, is_tx_nobuf); 2126 2127 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2128 *(uint16_t *)frm = htole16(capinfo); 2129 frm += 2; 2130 2131 *(uint16_t *)frm = htole16(arg); /* status */ 2132 frm += 2; 2133 2134 if (arg == IEEE80211_STATUS_SUCCESS) { 2135 *(uint16_t *)frm = htole16(ni->ni_associd); 2136 IEEE80211_NODE_STAT(ni, tx_assoc); 2137 } else 2138 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2139 frm += 2; 2140 2141 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2142 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2143 /* NB: respond according to what we received */ 2144 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2145 frm = ieee80211_add_htcap(frm, ni); 2146 frm = ieee80211_add_htinfo(frm, ni); 2147 } 2148 if ((vap->iv_flags & IEEE80211_F_WME) && 2149 ni->ni_ies.wme_ie != NULL) 2150 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2151 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2152 frm = ieee80211_add_htcap_vendor(frm, ni); 2153 frm = ieee80211_add_htinfo_vendor(frm, ni); 2154 } 2155 #ifdef IEEE80211_SUPPORT_SUPERG 2156 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2157 frm = ieee80211_add_ath(frm, 2158 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2159 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2160 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2161 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2162 #endif /* IEEE80211_SUPPORT_SUPERG */ 2163 if (vap->iv_appie_assocresp != NULL) 2164 frm = add_appie(frm, vap->iv_appie_assocresp); 2165 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2166 break; 2167 2168 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2169 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2170 "send station disassociate (reason %d)", arg); 2171 m = ieee80211_getmgtframe(&frm, 2172 ic->ic_headroom + sizeof(struct ieee80211_frame), 2173 sizeof(uint16_t)); 2174 if (m == NULL) 2175 senderr(ENOMEM, is_tx_nobuf); 2176 *(uint16_t *)frm = htole16(arg); /* reason */ 2177 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2178 2179 IEEE80211_NODE_STAT(ni, tx_disassoc); 2180 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2181 break; 2182 2183 default: 2184 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2185 "invalid mgmt frame type %u", type); 2186 senderr(EINVAL, is_tx_unknownmgt); 2187 /* NOTREACHED */ 2188 } 2189 2190 /* NB: force non-ProbeResp frames to the highest queue */ 2191 params.ibp_pri = WME_AC_VO; 2192 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2193 /* NB: we know all frames are unicast */ 2194 params.ibp_try0 = bss->ni_txparms->maxretry; 2195 params.ibp_power = bss->ni_txpower; 2196 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2197 bad: 2198 ieee80211_free_node(ni); 2199 return ret; 2200 #undef senderr 2201 #undef HTFLAGS 2202 } 2203 2204 /* 2205 * Return an mbuf with a probe response frame in it. 2206 * Space is left to prepend and 802.11 header at the 2207 * front but it's left to the caller to fill in. 2208 */ 2209 struct mbuf * 2210 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2211 { 2212 struct ieee80211vap *vap = bss->ni_vap; 2213 struct ieee80211com *ic = bss->ni_ic; 2214 const struct ieee80211_rateset *rs; 2215 struct mbuf *m; 2216 uint16_t capinfo; 2217 uint8_t *frm; 2218 2219 /* 2220 * probe response frame format 2221 * [8] time stamp 2222 * [2] beacon interval 2223 * [2] cabability information 2224 * [tlv] ssid 2225 * [tlv] supported rates 2226 * [tlv] parameter set (FH/DS) 2227 * [tlv] parameter set (IBSS) 2228 * [tlv] country (optional) 2229 * [3] power control (optional) 2230 * [5] channel switch announcement (CSA) (optional) 2231 * [tlv] extended rate phy (ERP) 2232 * [tlv] extended supported rates 2233 * [tlv] RSN (optional) 2234 * [tlv] HT capabilities 2235 * [tlv] HT information 2236 * [tlv] WPA (optional) 2237 * [tlv] WME (optional) 2238 * [tlv] Vendor OUI HT capabilities (optional) 2239 * [tlv] Vendor OUI HT information (optional) 2240 * [tlv] Atheros capabilities 2241 * [tlv] AppIE's (optional) 2242 * [tlv] Mesh ID (MBSS) 2243 * [tlv] Mesh Conf (MBSS) 2244 */ 2245 m = ieee80211_getmgtframe(&frm, 2246 ic->ic_headroom + sizeof(struct ieee80211_frame), 2247 8 2248 + sizeof(uint16_t) 2249 + sizeof(uint16_t) 2250 + 2 + IEEE80211_NWID_LEN 2251 + 2 + IEEE80211_RATE_SIZE 2252 + 7 /* max(7,3) */ 2253 + IEEE80211_COUNTRY_MAX_SIZE 2254 + 3 2255 + sizeof(struct ieee80211_csa_ie) 2256 + 3 2257 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2258 + sizeof(struct ieee80211_ie_wpa) 2259 + sizeof(struct ieee80211_ie_htcap) 2260 + sizeof(struct ieee80211_ie_htinfo) 2261 + sizeof(struct ieee80211_ie_wpa) 2262 + sizeof(struct ieee80211_wme_param) 2263 + 4 + sizeof(struct ieee80211_ie_htcap) 2264 + 4 + sizeof(struct ieee80211_ie_htinfo) 2265 #ifdef IEEE80211_SUPPORT_SUPERG 2266 + sizeof(struct ieee80211_ath_ie) 2267 #endif 2268 #ifdef IEEE80211_SUPPORT_MESH 2269 + 2 + IEEE80211_MESHID_LEN 2270 + sizeof(struct ieee80211_meshconf_ie) 2271 #endif 2272 + (vap->iv_appie_proberesp != NULL ? 2273 vap->iv_appie_proberesp->ie_len : 0) 2274 ); 2275 if (m == NULL) { 2276 vap->iv_stats.is_tx_nobuf++; 2277 return NULL; 2278 } 2279 2280 memset(frm, 0, 8); /* timestamp should be filled later */ 2281 frm += 8; 2282 *(uint16_t *)frm = htole16(bss->ni_intval); 2283 frm += 2; 2284 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2285 *(uint16_t *)frm = htole16(capinfo); 2286 frm += 2; 2287 2288 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2289 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2290 frm = ieee80211_add_rates(frm, rs); 2291 2292 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2293 *frm++ = IEEE80211_ELEMID_FHPARMS; 2294 *frm++ = 5; 2295 *frm++ = bss->ni_fhdwell & 0x00ff; 2296 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2297 *frm++ = IEEE80211_FH_CHANSET( 2298 ieee80211_chan2ieee(ic, bss->ni_chan)); 2299 *frm++ = IEEE80211_FH_CHANPAT( 2300 ieee80211_chan2ieee(ic, bss->ni_chan)); 2301 *frm++ = bss->ni_fhindex; 2302 } else { 2303 *frm++ = IEEE80211_ELEMID_DSPARMS; 2304 *frm++ = 1; 2305 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2306 } 2307 2308 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2309 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2310 *frm++ = 2; 2311 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2312 } 2313 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2314 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2315 frm = ieee80211_add_countryie(frm, ic); 2316 if (vap->iv_flags & IEEE80211_F_DOTH) { 2317 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2318 frm = ieee80211_add_powerconstraint(frm, vap); 2319 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2320 frm = ieee80211_add_csa(frm, vap); 2321 } 2322 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2323 frm = ieee80211_add_erp(frm, ic); 2324 frm = ieee80211_add_xrates(frm, rs); 2325 if (vap->iv_flags & IEEE80211_F_WPA2) { 2326 if (vap->iv_rsn_ie != NULL) 2327 frm = add_ie(frm, vap->iv_rsn_ie); 2328 /* XXX else complain? */ 2329 } 2330 /* 2331 * NB: legacy 11b clients do not get certain ie's. 2332 * The caller identifies such clients by passing 2333 * a token in legacy to us. Could expand this to be 2334 * any legacy client for stuff like HT ie's. 2335 */ 2336 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2337 legacy != IEEE80211_SEND_LEGACY_11B) { 2338 frm = ieee80211_add_htcap(frm, bss); 2339 frm = ieee80211_add_htinfo(frm, bss); 2340 } 2341 if (vap->iv_flags & IEEE80211_F_WPA1) { 2342 if (vap->iv_wpa_ie != NULL) 2343 frm = add_ie(frm, vap->iv_wpa_ie); 2344 /* XXX else complain? */ 2345 } 2346 if (vap->iv_flags & IEEE80211_F_WME) 2347 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2348 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2349 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2350 legacy != IEEE80211_SEND_LEGACY_11B) { 2351 frm = ieee80211_add_htcap_vendor(frm, bss); 2352 frm = ieee80211_add_htinfo_vendor(frm, bss); 2353 } 2354 #ifdef IEEE80211_SUPPORT_SUPERG 2355 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2356 legacy != IEEE80211_SEND_LEGACY_11B) 2357 frm = ieee80211_add_athcaps(frm, bss); 2358 #endif 2359 if (vap->iv_appie_proberesp != NULL) 2360 frm = add_appie(frm, vap->iv_appie_proberesp); 2361 #ifdef IEEE80211_SUPPORT_MESH 2362 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2363 frm = ieee80211_add_meshid(frm, vap); 2364 frm = ieee80211_add_meshconf(frm, vap); 2365 } 2366 #endif 2367 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2368 2369 return m; 2370 } 2371 2372 /* 2373 * Send a probe response frame to the specified mac address. 2374 * This does not go through the normal mgt frame api so we 2375 * can specify the destination address and re-use the bss node 2376 * for the sta reference. 2377 */ 2378 int 2379 ieee80211_send_proberesp(struct ieee80211vap *vap, 2380 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2381 { 2382 struct ieee80211_node *bss = vap->iv_bss; 2383 struct ieee80211com *ic = vap->iv_ic; 2384 struct ieee80211_frame *wh; 2385 struct mbuf *m; 2386 2387 if (vap->iv_state == IEEE80211_S_CAC) { 2388 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2389 "block %s frame in CAC state", "probe response"); 2390 vap->iv_stats.is_tx_badstate++; 2391 return EIO; /* XXX */ 2392 } 2393 2394 /* 2395 * Hold a reference on the node so it doesn't go away until after 2396 * the xmit is complete all the way in the driver. On error we 2397 * will remove our reference. 2398 */ 2399 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2400 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2401 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2402 ieee80211_node_refcnt(bss)+1); 2403 ieee80211_ref_node(bss); 2404 2405 m = ieee80211_alloc_proberesp(bss, legacy); 2406 if (m == NULL) { 2407 ieee80211_free_node(bss); 2408 return ENOMEM; 2409 } 2410 2411 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2412 KASSERT(m != NULL, ("no room for header")); 2413 2414 wh = mtod(m, struct ieee80211_frame *); 2415 ieee80211_send_setup(bss, m, 2416 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2417 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2418 /* XXX power management? */ 2419 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2420 2421 M_WME_SETAC(m, WME_AC_BE); 2422 2423 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2424 "send probe resp on channel %u to %s%s\n", 2425 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2426 legacy ? " <legacy>" : ""); 2427 IEEE80211_NODE_STAT(bss, tx_mgmt); 2428 2429 return ic->ic_raw_xmit(bss, m, NULL); 2430 } 2431 2432 /* 2433 * Allocate and build a RTS (Request To Send) control frame. 2434 */ 2435 struct mbuf * 2436 ieee80211_alloc_rts(struct ieee80211com *ic, 2437 const uint8_t ra[IEEE80211_ADDR_LEN], 2438 const uint8_t ta[IEEE80211_ADDR_LEN], 2439 uint16_t dur) 2440 { 2441 struct ieee80211_frame_rts *rts; 2442 struct mbuf *m; 2443 2444 /* XXX honor ic_headroom */ 2445 m = m_gethdr(M_DONTWAIT, MT_DATA); 2446 if (m != NULL) { 2447 rts = mtod(m, struct ieee80211_frame_rts *); 2448 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2449 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2450 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2451 *(u_int16_t *)rts->i_dur = htole16(dur); 2452 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2453 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2454 2455 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2456 } 2457 return m; 2458 } 2459 2460 /* 2461 * Allocate and build a CTS (Clear To Send) control frame. 2462 */ 2463 struct mbuf * 2464 ieee80211_alloc_cts(struct ieee80211com *ic, 2465 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2466 { 2467 struct ieee80211_frame_cts *cts; 2468 struct mbuf *m; 2469 2470 /* XXX honor ic_headroom */ 2471 m = m_gethdr(M_DONTWAIT, MT_DATA); 2472 if (m != NULL) { 2473 cts = mtod(m, struct ieee80211_frame_cts *); 2474 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2475 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2476 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2477 *(u_int16_t *)cts->i_dur = htole16(dur); 2478 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2479 2480 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2481 } 2482 return m; 2483 } 2484 2485 static void 2486 ieee80211_tx_mgt_timeout(void *arg) 2487 { 2488 struct ieee80211_node *ni = arg; 2489 struct ieee80211vap *vap = ni->ni_vap; 2490 2491 if (vap->iv_state != IEEE80211_S_INIT && 2492 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2493 /* 2494 * NB: it's safe to specify a timeout as the reason here; 2495 * it'll only be used in the right state. 2496 */ 2497 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2498 IEEE80211_SCAN_FAIL_TIMEOUT); 2499 } 2500 } 2501 2502 static void 2503 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2504 { 2505 struct ieee80211vap *vap = ni->ni_vap; 2506 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2507 2508 /* 2509 * Frame transmit completed; arrange timer callback. If 2510 * transmit was successfuly we wait for response. Otherwise 2511 * we arrange an immediate callback instead of doing the 2512 * callback directly since we don't know what state the driver 2513 * is in (e.g. what locks it is holding). This work should 2514 * not be too time-critical and not happen too often so the 2515 * added overhead is acceptable. 2516 * 2517 * XXX what happens if !acked but response shows up before callback? 2518 */ 2519 if (vap->iv_state == ostate) 2520 callout_reset(&vap->iv_mgtsend, 2521 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2522 ieee80211_tx_mgt_timeout, ni); 2523 } 2524 2525 static void 2526 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2527 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2528 { 2529 struct ieee80211vap *vap = ni->ni_vap; 2530 struct ieee80211com *ic = ni->ni_ic; 2531 struct ieee80211_rateset *rs = &ni->ni_rates; 2532 uint16_t capinfo; 2533 2534 /* 2535 * beacon frame format 2536 * [8] time stamp 2537 * [2] beacon interval 2538 * [2] cabability information 2539 * [tlv] ssid 2540 * [tlv] supported rates 2541 * [3] parameter set (DS) 2542 * [8] CF parameter set (optional) 2543 * [tlv] parameter set (IBSS/TIM) 2544 * [tlv] country (optional) 2545 * [3] power control (optional) 2546 * [5] channel switch announcement (CSA) (optional) 2547 * [tlv] extended rate phy (ERP) 2548 * [tlv] extended supported rates 2549 * [tlv] RSN parameters 2550 * [tlv] HT capabilities 2551 * [tlv] HT information 2552 * XXX Vendor-specific OIDs (e.g. Atheros) 2553 * [tlv] WPA parameters 2554 * [tlv] WME parameters 2555 * [tlv] Vendor OUI HT capabilities (optional) 2556 * [tlv] Vendor OUI HT information (optional) 2557 * [tlv] Atheros capabilities (optional) 2558 * [tlv] TDMA parameters (optional) 2559 * [tlv] Mesh ID (MBSS) 2560 * [tlv] Mesh Conf (MBSS) 2561 * [tlv] application data (optional) 2562 */ 2563 2564 memset(bo, 0, sizeof(*bo)); 2565 2566 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2567 frm += 8; 2568 *(uint16_t *)frm = htole16(ni->ni_intval); 2569 frm += 2; 2570 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2571 bo->bo_caps = (uint16_t *)frm; 2572 *(uint16_t *)frm = htole16(capinfo); 2573 frm += 2; 2574 *frm++ = IEEE80211_ELEMID_SSID; 2575 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2576 *frm++ = ni->ni_esslen; 2577 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2578 frm += ni->ni_esslen; 2579 } else 2580 *frm++ = 0; 2581 frm = ieee80211_add_rates(frm, rs); 2582 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2583 *frm++ = IEEE80211_ELEMID_DSPARMS; 2584 *frm++ = 1; 2585 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2586 } 2587 if (ic->ic_flags & IEEE80211_F_PCF) { 2588 bo->bo_cfp = frm; 2589 frm = ieee80211_add_cfparms(frm, ic); 2590 } 2591 bo->bo_tim = frm; 2592 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2593 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2594 *frm++ = 2; 2595 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2596 bo->bo_tim_len = 0; 2597 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2598 vap->iv_opmode == IEEE80211_M_MBSS) { 2599 /* TIM IE is the same for Mesh and Hostap */ 2600 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2601 2602 tie->tim_ie = IEEE80211_ELEMID_TIM; 2603 tie->tim_len = 4; /* length */ 2604 tie->tim_count = 0; /* DTIM count */ 2605 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2606 tie->tim_bitctl = 0; /* bitmap control */ 2607 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2608 frm += sizeof(struct ieee80211_tim_ie); 2609 bo->bo_tim_len = 1; 2610 } 2611 bo->bo_tim_trailer = frm; 2612 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2613 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2614 frm = ieee80211_add_countryie(frm, ic); 2615 if (vap->iv_flags & IEEE80211_F_DOTH) { 2616 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2617 frm = ieee80211_add_powerconstraint(frm, vap); 2618 bo->bo_csa = frm; 2619 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2620 frm = ieee80211_add_csa(frm, vap); 2621 } else 2622 bo->bo_csa = frm; 2623 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2624 bo->bo_erp = frm; 2625 frm = ieee80211_add_erp(frm, ic); 2626 } 2627 frm = ieee80211_add_xrates(frm, rs); 2628 if (vap->iv_flags & IEEE80211_F_WPA2) { 2629 if (vap->iv_rsn_ie != NULL) 2630 frm = add_ie(frm, vap->iv_rsn_ie); 2631 /* XXX else complain */ 2632 } 2633 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2634 frm = ieee80211_add_htcap(frm, ni); 2635 bo->bo_htinfo = frm; 2636 frm = ieee80211_add_htinfo(frm, ni); 2637 } 2638 if (vap->iv_flags & IEEE80211_F_WPA1) { 2639 if (vap->iv_wpa_ie != NULL) 2640 frm = add_ie(frm, vap->iv_wpa_ie); 2641 /* XXX else complain */ 2642 } 2643 if (vap->iv_flags & IEEE80211_F_WME) { 2644 bo->bo_wme = frm; 2645 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2646 } 2647 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2648 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2649 frm = ieee80211_add_htcap_vendor(frm, ni); 2650 frm = ieee80211_add_htinfo_vendor(frm, ni); 2651 } 2652 #ifdef IEEE80211_SUPPORT_SUPERG 2653 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2654 bo->bo_ath = frm; 2655 frm = ieee80211_add_athcaps(frm, ni); 2656 } 2657 #endif 2658 #ifdef IEEE80211_SUPPORT_TDMA 2659 if (vap->iv_caps & IEEE80211_C_TDMA) { 2660 bo->bo_tdma = frm; 2661 frm = ieee80211_add_tdma(frm, vap); 2662 } 2663 #endif 2664 if (vap->iv_appie_beacon != NULL) { 2665 bo->bo_appie = frm; 2666 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2667 frm = add_appie(frm, vap->iv_appie_beacon); 2668 } 2669 #ifdef IEEE80211_SUPPORT_MESH 2670 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2671 frm = ieee80211_add_meshid(frm, vap); 2672 bo->bo_meshconf = frm; 2673 frm = ieee80211_add_meshconf(frm, vap); 2674 } 2675 #endif 2676 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2677 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2678 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2679 } 2680 2681 /* 2682 * Allocate a beacon frame and fillin the appropriate bits. 2683 */ 2684 struct mbuf * 2685 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2686 struct ieee80211_beacon_offsets *bo) 2687 { 2688 struct ieee80211vap *vap = ni->ni_vap; 2689 struct ieee80211com *ic = ni->ni_ic; 2690 struct ifnet *ifp = vap->iv_ifp; 2691 struct ieee80211_frame *wh; 2692 struct mbuf *m; 2693 int pktlen; 2694 uint8_t *frm; 2695 2696 /* 2697 * beacon frame format 2698 * [8] time stamp 2699 * [2] beacon interval 2700 * [2] cabability information 2701 * [tlv] ssid 2702 * [tlv] supported rates 2703 * [3] parameter set (DS) 2704 * [8] CF parameter set (optional) 2705 * [tlv] parameter set (IBSS/TIM) 2706 * [tlv] country (optional) 2707 * [3] power control (optional) 2708 * [5] channel switch announcement (CSA) (optional) 2709 * [tlv] extended rate phy (ERP) 2710 * [tlv] extended supported rates 2711 * [tlv] RSN parameters 2712 * [tlv] HT capabilities 2713 * [tlv] HT information 2714 * [tlv] Vendor OUI HT capabilities (optional) 2715 * [tlv] Vendor OUI HT information (optional) 2716 * XXX Vendor-specific OIDs (e.g. Atheros) 2717 * [tlv] WPA parameters 2718 * [tlv] WME parameters 2719 * [tlv] TDMA parameters (optional) 2720 * [tlv] Mesh ID (MBSS) 2721 * [tlv] Mesh Conf (MBSS) 2722 * [tlv] application data (optional) 2723 * NB: we allocate the max space required for the TIM bitmap. 2724 * XXX how big is this? 2725 */ 2726 pktlen = 8 /* time stamp */ 2727 + sizeof(uint16_t) /* beacon interval */ 2728 + sizeof(uint16_t) /* capabilities */ 2729 + 2 + ni->ni_esslen /* ssid */ 2730 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2731 + 2 + 1 /* DS parameters */ 2732 + 2 + 6 /* CF parameters */ 2733 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2734 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2735 + 2 + 1 /* power control */ 2736 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2737 + 2 + 1 /* ERP */ 2738 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2739 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2740 2*sizeof(struct ieee80211_ie_wpa) : 0) 2741 /* XXX conditional? */ 2742 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2743 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2744 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2745 sizeof(struct ieee80211_wme_param) : 0) 2746 #ifdef IEEE80211_SUPPORT_SUPERG 2747 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2748 #endif 2749 #ifdef IEEE80211_SUPPORT_TDMA 2750 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2751 sizeof(struct ieee80211_tdma_param) : 0) 2752 #endif 2753 #ifdef IEEE80211_SUPPORT_MESH 2754 + 2 + ni->ni_meshidlen 2755 + sizeof(struct ieee80211_meshconf_ie) 2756 #endif 2757 + IEEE80211_MAX_APPIE 2758 ; 2759 m = ieee80211_getmgtframe(&frm, 2760 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2761 if (m == NULL) { 2762 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2763 "%s: cannot get buf; size %u\n", __func__, pktlen); 2764 vap->iv_stats.is_tx_nobuf++; 2765 return NULL; 2766 } 2767 ieee80211_beacon_construct(m, frm, bo, ni); 2768 2769 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2770 KASSERT(m != NULL, ("no space for 802.11 header?")); 2771 wh = mtod(m, struct ieee80211_frame *); 2772 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2773 IEEE80211_FC0_SUBTYPE_BEACON; 2774 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2775 *(uint16_t *)wh->i_dur = 0; 2776 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2777 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2778 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2779 *(uint16_t *)wh->i_seq = 0; 2780 2781 return m; 2782 } 2783 2784 /* 2785 * Update the dynamic parts of a beacon frame based on the current state. 2786 */ 2787 int 2788 ieee80211_beacon_update(struct ieee80211_node *ni, 2789 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2790 { 2791 struct ieee80211vap *vap = ni->ni_vap; 2792 struct ieee80211com *ic = ni->ni_ic; 2793 int len_changed = 0; 2794 uint16_t capinfo; 2795 struct ieee80211_frame *wh; 2796 ieee80211_seq seqno; 2797 2798 IEEE80211_LOCK(ic); 2799 /* 2800 * Handle 11h channel change when we've reached the count. 2801 * We must recalculate the beacon frame contents to account 2802 * for the new channel. Note we do this only for the first 2803 * vap that reaches this point; subsequent vaps just update 2804 * their beacon state to reflect the recalculated channel. 2805 */ 2806 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2807 vap->iv_csa_count == ic->ic_csa_count) { 2808 vap->iv_csa_count = 0; 2809 /* 2810 * Effect channel change before reconstructing the beacon 2811 * frame contents as many places reference ni_chan. 2812 */ 2813 if (ic->ic_csa_newchan != NULL) 2814 ieee80211_csa_completeswitch(ic); 2815 /* 2816 * NB: ieee80211_beacon_construct clears all pending 2817 * updates in bo_flags so we don't need to explicitly 2818 * clear IEEE80211_BEACON_CSA. 2819 */ 2820 ieee80211_beacon_construct(m, 2821 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2822 2823 /* XXX do WME aggressive mode processing? */ 2824 IEEE80211_UNLOCK(ic); 2825 return 1; /* just assume length changed */ 2826 } 2827 2828 wh = mtod(m, struct ieee80211_frame *); 2829 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 2830 *(uint16_t *)&wh->i_seq[0] = 2831 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 2832 M_SEQNO_SET(m, seqno); 2833 2834 /* XXX faster to recalculate entirely or just changes? */ 2835 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2836 *bo->bo_caps = htole16(capinfo); 2837 2838 if (vap->iv_flags & IEEE80211_F_WME) { 2839 struct ieee80211_wme_state *wme = &ic->ic_wme; 2840 2841 /* 2842 * Check for agressive mode change. When there is 2843 * significant high priority traffic in the BSS 2844 * throttle back BE traffic by using conservative 2845 * parameters. Otherwise BE uses agressive params 2846 * to optimize performance of legacy/non-QoS traffic. 2847 */ 2848 if (wme->wme_flags & WME_F_AGGRMODE) { 2849 if (wme->wme_hipri_traffic > 2850 wme->wme_hipri_switch_thresh) { 2851 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2852 "%s: traffic %u, disable aggressive mode\n", 2853 __func__, wme->wme_hipri_traffic); 2854 wme->wme_flags &= ~WME_F_AGGRMODE; 2855 ieee80211_wme_updateparams_locked(vap); 2856 wme->wme_hipri_traffic = 2857 wme->wme_hipri_switch_hysteresis; 2858 } else 2859 wme->wme_hipri_traffic = 0; 2860 } else { 2861 if (wme->wme_hipri_traffic <= 2862 wme->wme_hipri_switch_thresh) { 2863 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2864 "%s: traffic %u, enable aggressive mode\n", 2865 __func__, wme->wme_hipri_traffic); 2866 wme->wme_flags |= WME_F_AGGRMODE; 2867 ieee80211_wme_updateparams_locked(vap); 2868 wme->wme_hipri_traffic = 0; 2869 } else 2870 wme->wme_hipri_traffic = 2871 wme->wme_hipri_switch_hysteresis; 2872 } 2873 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2874 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2875 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2876 } 2877 } 2878 2879 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2880 ieee80211_ht_update_beacon(vap, bo); 2881 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2882 } 2883 #ifdef IEEE80211_SUPPORT_TDMA 2884 if (vap->iv_caps & IEEE80211_C_TDMA) { 2885 /* 2886 * NB: the beacon is potentially updated every TBTT. 2887 */ 2888 ieee80211_tdma_update_beacon(vap, bo); 2889 } 2890 #endif 2891 #ifdef IEEE80211_SUPPORT_MESH 2892 if (vap->iv_opmode == IEEE80211_M_MBSS) 2893 ieee80211_mesh_update_beacon(vap, bo); 2894 #endif 2895 2896 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2897 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2898 struct ieee80211_tim_ie *tie = 2899 (struct ieee80211_tim_ie *) bo->bo_tim; 2900 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2901 u_int timlen, timoff, i; 2902 /* 2903 * ATIM/DTIM needs updating. If it fits in the 2904 * current space allocated then just copy in the 2905 * new bits. Otherwise we need to move any trailing 2906 * data to make room. Note that we know there is 2907 * contiguous space because ieee80211_beacon_allocate 2908 * insures there is space in the mbuf to write a 2909 * maximal-size virtual bitmap (based on iv_max_aid). 2910 */ 2911 /* 2912 * Calculate the bitmap size and offset, copy any 2913 * trailer out of the way, and then copy in the 2914 * new bitmap and update the information element. 2915 * Note that the tim bitmap must contain at least 2916 * one byte and any offset must be even. 2917 */ 2918 if (vap->iv_ps_pending != 0) { 2919 timoff = 128; /* impossibly large */ 2920 for (i = 0; i < vap->iv_tim_len; i++) 2921 if (vap->iv_tim_bitmap[i]) { 2922 timoff = i &~ 1; 2923 break; 2924 } 2925 KASSERT(timoff != 128, ("tim bitmap empty!")); 2926 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2927 if (vap->iv_tim_bitmap[i]) 2928 break; 2929 timlen = 1 + (i - timoff); 2930 } else { 2931 timoff = 0; 2932 timlen = 1; 2933 } 2934 if (timlen != bo->bo_tim_len) { 2935 /* copy up/down trailer */ 2936 int adjust = tie->tim_bitmap+timlen 2937 - bo->bo_tim_trailer; 2938 ovbcopy(bo->bo_tim_trailer, 2939 bo->bo_tim_trailer+adjust, 2940 bo->bo_tim_trailer_len); 2941 bo->bo_tim_trailer += adjust; 2942 bo->bo_erp += adjust; 2943 bo->bo_htinfo += adjust; 2944 #ifdef IEEE80211_SUPPORT_SUPERG 2945 bo->bo_ath += adjust; 2946 #endif 2947 #ifdef IEEE80211_SUPPORT_TDMA 2948 bo->bo_tdma += adjust; 2949 #endif 2950 #ifdef IEEE80211_SUPPORT_MESH 2951 bo->bo_meshconf += adjust; 2952 #endif 2953 bo->bo_appie += adjust; 2954 bo->bo_wme += adjust; 2955 bo->bo_csa += adjust; 2956 bo->bo_tim_len = timlen; 2957 2958 /* update information element */ 2959 tie->tim_len = 3 + timlen; 2960 tie->tim_bitctl = timoff; 2961 len_changed = 1; 2962 } 2963 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2964 bo->bo_tim_len); 2965 2966 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2967 2968 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2969 "%s: TIM updated, pending %u, off %u, len %u\n", 2970 __func__, vap->iv_ps_pending, timoff, timlen); 2971 } 2972 /* count down DTIM period */ 2973 if (tie->tim_count == 0) 2974 tie->tim_count = tie->tim_period - 1; 2975 else 2976 tie->tim_count--; 2977 /* update state for buffered multicast frames on DTIM */ 2978 if (mcast && tie->tim_count == 0) 2979 tie->tim_bitctl |= 1; 2980 else 2981 tie->tim_bitctl &= ~1; 2982 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2983 struct ieee80211_csa_ie *csa = 2984 (struct ieee80211_csa_ie *) bo->bo_csa; 2985 2986 /* 2987 * Insert or update CSA ie. If we're just starting 2988 * to count down to the channel switch then we need 2989 * to insert the CSA ie. Otherwise we just need to 2990 * drop the count. The actual change happens above 2991 * when the vap's count reaches the target count. 2992 */ 2993 if (vap->iv_csa_count == 0) { 2994 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2995 bo->bo_erp += sizeof(*csa); 2996 bo->bo_htinfo += sizeof(*csa); 2997 bo->bo_wme += sizeof(*csa); 2998 #ifdef IEEE80211_SUPPORT_SUPERG 2999 bo->bo_ath += sizeof(*csa); 3000 #endif 3001 #ifdef IEEE80211_SUPPORT_TDMA 3002 bo->bo_tdma += sizeof(*csa); 3003 #endif 3004 #ifdef IEEE80211_SUPPORT_MESH 3005 bo->bo_meshconf += sizeof(*csa); 3006 #endif 3007 bo->bo_appie += sizeof(*csa); 3008 bo->bo_csa_trailer_len += sizeof(*csa); 3009 bo->bo_tim_trailer_len += sizeof(*csa); 3010 m->m_len += sizeof(*csa); 3011 m->m_pkthdr.len += sizeof(*csa); 3012 3013 ieee80211_add_csa(bo->bo_csa, vap); 3014 } else 3015 csa->csa_count--; 3016 vap->iv_csa_count++; 3017 /* NB: don't clear IEEE80211_BEACON_CSA */ 3018 } 3019 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3020 /* 3021 * ERP element needs updating. 3022 */ 3023 (void) ieee80211_add_erp(bo->bo_erp, ic); 3024 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3025 } 3026 #ifdef IEEE80211_SUPPORT_SUPERG 3027 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3028 ieee80211_add_athcaps(bo->bo_ath, ni); 3029 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3030 } 3031 #endif 3032 } 3033 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3034 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3035 int aielen; 3036 uint8_t *frm; 3037 3038 aielen = 0; 3039 if (aie != NULL) 3040 aielen += aie->ie_len; 3041 if (aielen != bo->bo_appie_len) { 3042 /* copy up/down trailer */ 3043 int adjust = aielen - bo->bo_appie_len; 3044 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3045 bo->bo_tim_trailer_len); 3046 bo->bo_tim_trailer += adjust; 3047 bo->bo_appie += adjust; 3048 bo->bo_appie_len = aielen; 3049 3050 len_changed = 1; 3051 } 3052 frm = bo->bo_appie; 3053 if (aie != NULL) 3054 frm = add_appie(frm, aie); 3055 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3056 } 3057 IEEE80211_UNLOCK(ic); 3058 3059 return len_changed; 3060 }
Cache object: b9aeb7c4a38b7fd30b1902f84aa384c9
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