ieee80211_output.c revision 1.24
1 /* $NetBSD: ieee80211_output.c,v 1.24 2004/12/27 10:47:57 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.10 2004/04/02 23:25:39 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.24 2004/12/27 10:47:57 dyoung Exp $"); 39 #endif 40 41 #include "opt_inet.h" 42 43 #ifdef __NetBSD__ 44 #include "bpfilter.h" 45 #endif /* __NetBSD__ */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/mbuf.h> 50 #include <sys/malloc.h> 51 #include <sys/kernel.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/endian.h> 55 #include <sys/errno.h> 56 #ifdef __FreeBSD__ 57 #include <sys/bus.h> 58 #endif 59 #include <sys/proc.h> 60 #include <sys/sysctl.h> 61 62 #ifdef __FreeBSD__ 63 #include <machine/atomic.h> 64 #endif 65 66 #include <net/if.h> 67 #include <net/if_dl.h> 68 #include <net/if_media.h> 69 #include <net/if_arp.h> 70 #ifdef __FreeBSD__ 71 #include <net/ethernet.h> 72 #else 73 #include <net/if_ether.h> 74 #endif 75 #include <net/if_llc.h> 76 77 #include <net80211/ieee80211_var.h> 78 #include <net80211/ieee80211_compat.h> 79 80 #if NBPFILTER > 0 81 #include <net/bpf.h> 82 #endif 83 84 #ifdef INET 85 #include <netinet/in.h> 86 #ifdef __FreeBSD__ 87 #include <netinet/if_ether.h> 88 #else 89 #include <net/if_ether.h> 90 #endif 91 #endif 92 93 #ifdef IEEE80211_DEBUG 94 /* 95 * Decide if an outbound management frame should be 96 * printed when debugging is enabled. This filters some 97 * of the less interesting frames that come frequently 98 * (e.g. beacons). 99 */ 100 static __inline int 101 doprint(struct ieee80211com *ic, int subtype) 102 { 103 switch (subtype) { 104 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 105 return (ic->ic_opmode == IEEE80211_M_IBSS); 106 } 107 return 1; 108 } 109 #endif 110 111 /* 112 * Send a management frame to the specified node. The node pointer 113 * must have a reference as the pointer will be passed to the driver 114 * and potentially held for a long time. If the frame is successfully 115 * dispatched to the driver, then it is responsible for freeing the 116 * reference (and potentially free'ing up any associated storage). 117 */ 118 static int 119 ieee80211_mgmt_output(struct ifnet *ifp, struct ieee80211_node *ni, 120 struct mbuf *m, int type) 121 { 122 struct ieee80211com *ic = (void *)ifp; 123 struct ieee80211_frame *wh; 124 125 IASSERT(ni != NULL, ("null node")); 126 ni->ni_inact = 0; 127 128 /* 129 * Yech, hack alert! We want to pass the node down to the 130 * driver's start routine. If we don't do so then the start 131 * routine must immediately look it up again and that can 132 * cause a lock order reversal if, for example, this frame 133 * is being sent because the station is being timedout and 134 * the frame being sent is a DEAUTH message. We could stick 135 * this in an m_tag and tack that on to the mbuf. However 136 * that's rather expensive to do for every frame so instead 137 * we stuff it in the rcvif field since outbound frames do 138 * not (presently) use this. 139 */ 140 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 141 if (m == NULL) 142 return ENOMEM; 143 #ifdef __FreeBSD__ 144 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 145 #endif 146 m->m_pkthdr.rcvif = (void *)ni; 147 148 wh = mtod(m, struct ieee80211_frame *); 149 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type; 150 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 151 *(u_int16_t *)&wh->i_dur[0] = 0; 152 *(u_int16_t *)&wh->i_seq[0] = 153 htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT); 154 ni->ni_txseq++; 155 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 156 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 157 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 158 159 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 160 m->m_flags &= ~M_LINK0; 161 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 162 ("%s: encrypting frame for %s\n", 163 __func__, ether_sprintf(wh->i_addr1))); 164 wh->i_fc[1] |= IEEE80211_FC1_WEP; 165 } 166 #ifdef IEEE80211_DEBUG 167 /* avoid printing too many frames */ 168 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 169 ieee80211_msg_dumppkts(ic)) { 170 if_printf(ifp, "sending %s to %s on channel %u\n", 171 ieee80211_mgt_subtype_name[ 172 (type & IEEE80211_FC0_SUBTYPE_MASK) 173 >> IEEE80211_FC0_SUBTYPE_SHIFT], 174 ether_sprintf(ni->ni_macaddr), 175 ieee80211_chan2ieee(ic, ni->ni_chan)); 176 } 177 #endif 178 IF_ENQUEUE(&ic->ic_mgtq, m); 179 ifp->if_timer = 1; 180 (*ifp->if_start)(ifp); 181 return 0; 182 } 183 184 /* 185 * Encapsulate an outbound data frame. The mbuf chain is updated and 186 * a reference to the destination node is returned. If an error is 187 * encountered NULL is returned and the node reference will also be NULL. 188 * 189 * NB: The caller is responsible for free'ing a returned node reference. 190 * The convention is ic_bss is not reference counted; the caller must 191 * maintain that. 192 */ 193 struct mbuf * 194 ieee80211_encap(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node **pni) 195 { 196 struct ieee80211com *ic = (void *)ifp; 197 struct ether_header eh; 198 struct ieee80211_frame *wh; 199 struct ieee80211_node *ni = NULL; 200 struct llc *llc; 201 202 if (m->m_len < sizeof(struct ether_header)) { 203 m = m_pullup(m, sizeof(struct ether_header)); 204 if (m == NULL) { 205 ic->ic_stats.is_tx_nombuf++; 206 goto bad; 207 } 208 } 209 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 210 211 ni = ieee80211_find_txnode(ic, eh.ether_dhost); 212 if (ni == NULL) { 213 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 214 ("%s: no node for dst %s, discard frame\n", 215 __func__, ether_sprintf(eh.ether_dhost))); 216 ic->ic_stats.is_tx_nonode++; 217 goto bad; 218 } 219 ni->ni_inact = 0; 220 221 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 222 llc = mtod(m, struct llc *); 223 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 224 llc->llc_control = LLC_UI; 225 llc->llc_snap.org_code[0] = 0; 226 llc->llc_snap.org_code[1] = 0; 227 llc->llc_snap.org_code[2] = 0; 228 llc->llc_snap.ether_type = eh.ether_type; 229 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 230 if (m == NULL) { 231 ic->ic_stats.is_tx_nombuf++; 232 goto bad; 233 } 234 wh = mtod(m, struct ieee80211_frame *); 235 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 236 *(u_int16_t *)&wh->i_dur[0] = 0; 237 *(u_int16_t *)&wh->i_seq[0] = 238 htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT); 239 ni->ni_txseq++; 240 switch (ic->ic_opmode) { 241 case IEEE80211_M_STA: 242 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 243 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 244 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 245 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 246 break; 247 case IEEE80211_M_IBSS: 248 case IEEE80211_M_AHDEMO: 249 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 250 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 251 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 252 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 253 break; 254 case IEEE80211_M_HOSTAP: 255 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 256 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 257 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 258 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 259 break; 260 case IEEE80211_M_MONITOR: 261 goto bad; 262 } 263 if (ic->ic_flags & IEEE80211_F_PRIVACY) 264 wh->i_fc[1] |= IEEE80211_FC1_WEP; 265 *pni = ni; 266 return m; 267 bad: 268 if (m != NULL) 269 m_freem(m); 270 if (ni != NULL) 271 ieee80211_release_node(ic, ni); 272 *pni = NULL; 273 return NULL; 274 } 275 276 /* 277 * Arguments in: 278 * 279 * paylen: payload length (no FCS, no WEP header) 280 * 281 * hdrlen: header length 282 * 283 * rate: MSDU speed, units 500kb/s 284 * 285 * flags: IEEE80211_F_SHPREAMBLE (use short preamble), 286 * IEEE80211_F_SHSLOT (use short slot length) 287 * 288 * Arguments out: 289 * 290 * d: 802.11 Duration field for RTS, 291 * 802.11 Duration field for data frame, 292 * PLCP Length for data frame, 293 * residual octets at end of data slot 294 */ 295 static int 296 ieee80211_compute_duration1(int len, int use_ack, uint32_t flags, int rate, 297 struct ieee80211_duration *d) 298 { 299 int pre, ctsrate; 300 int ack, bitlen, data_dur, remainder; 301 302 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 303 * DATA reserves medium for SIFS | ACK 304 * 305 * XXXMYC: no ACK on multicast/broadcast or control packets 306 */ 307 308 bitlen = len * 8; 309 310 pre = IEEE80211_DUR_DS_SIFS; 311 if ((flags & IEEE80211_F_SHPREAMBLE) != 0) 312 pre += IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR; 313 else 314 pre += IEEE80211_DUR_DS_LONG_PREAMBLE + IEEE80211_DUR_DS_SLOW_PLCPHDR; 315 316 d->d_residue = 0; 317 data_dur = (bitlen * 2) / rate; 318 remainder = (bitlen * 2) % rate; 319 if (remainder != 0) { 320 d->d_residue = (rate - remainder) / 16; 321 data_dur++; 322 } 323 324 switch (rate) { 325 case 2: /* 1 Mb/s */ 326 case 4: /* 2 Mb/s */ 327 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 328 ctsrate = 2; 329 break; 330 case 11: /* 5.5 Mb/s */ 331 case 22: /* 11 Mb/s */ 332 case 44: /* 22 Mb/s */ 333 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 334 ctsrate = 4; 335 break; 336 default: 337 /* TBD */ 338 return -1; 339 } 340 341 d->d_plcp_len = data_dur; 342 343 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 344 345 d->d_rts_dur = 346 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 347 pre + data_dur + 348 ack; 349 350 d->d_data_dur = ack; 351 352 return 0; 353 } 354 355 /* 356 * Arguments in: 357 * 358 * wh: 802.11 header 359 * 360 * paylen: payload length (no FCS, no WEP header) 361 * 362 * rate: MSDU speed, units 500kb/s 363 * 364 * fraglen: fragment length, set to maximum (or higher) for no 365 * fragmentation 366 * 367 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 368 * IEEE80211_F_SHPREAMBLE (use short preamble), 369 * IEEE80211_F_SHSLOT (use short slot length) 370 * 371 * Arguments out: 372 * 373 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 374 * of first/only fragment 375 * 376 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 377 * of first/only fragment 378 */ 379 int 380 ieee80211_compute_duration(struct ieee80211_frame *wh, int len, 381 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 382 struct ieee80211_duration *dn, int *npktp, int debug) 383 { 384 int ack, rc; 385 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 386 387 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 388 hdrlen = sizeof(struct ieee80211_frame_addr4); 389 else 390 hdrlen = sizeof(struct ieee80211_frame); 391 392 paylen = len - hdrlen; 393 394 if ((flags & IEEE80211_F_PRIVACY) != 0) 395 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 396 else 397 overlen = IEEE80211_CRC_LEN; 398 399 npkt = paylen / fraglen; 400 lastlen0 = paylen % fraglen; 401 402 if (npkt == 0) /* no fragments */ 403 lastlen = paylen + overlen; 404 else if (lastlen0 != 0) { /* a short "tail" fragment */ 405 lastlen = lastlen0 + overlen; 406 npkt++; 407 } else /* full-length "tail" fragment */ 408 lastlen = fraglen + overlen; 409 410 if (npktp != NULL) 411 *npktp = npkt; 412 413 if (npkt > 1) 414 firstlen = fraglen + overlen; 415 else 416 firstlen = paylen + overlen; 417 418 if (debug) { 419 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 420 "fraglen %d overlen %d len %d rate %d flags %08x\n", 421 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 422 overlen, len, rate, flags); 423 } 424 425 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 426 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 427 428 rc = ieee80211_compute_duration1(firstlen + hdrlen, 429 ack, flags, rate, d0); 430 if (rc == -1) 431 return rc; 432 433 if (npkt <= 1) { 434 *dn = *d0; 435 return 0; 436 } 437 return ieee80211_compute_duration1(lastlen + hdrlen, ack, flags, rate, 438 dn); 439 } 440 441 /* 442 * Add a supported rates element id to a frame. 443 */ 444 u_int8_t * 445 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 446 { 447 int nrates; 448 449 *frm++ = IEEE80211_ELEMID_RATES; 450 nrates = rs->rs_nrates; 451 if (nrates > IEEE80211_RATE_SIZE) 452 nrates = IEEE80211_RATE_SIZE; 453 *frm++ = nrates; 454 memcpy(frm, rs->rs_rates, nrates); 455 return frm + nrates; 456 } 457 458 /* 459 * Add an extended supported rates element id to a frame. 460 */ 461 u_int8_t * 462 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 463 { 464 /* 465 * Add an extended supported rates element if operating in 11g mode. 466 */ 467 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 468 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 469 *frm++ = IEEE80211_ELEMID_XRATES; 470 *frm++ = nrates; 471 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 472 frm += nrates; 473 } 474 return frm; 475 } 476 477 /* 478 * Add an ssid elemet to a frame. 479 */ 480 static u_int8_t * 481 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 482 { 483 *frm++ = IEEE80211_ELEMID_SSID; 484 *frm++ = len; 485 memcpy(frm, ssid, len); 486 return frm + len; 487 } 488 489 static struct mbuf * 490 ieee80211_getmbuf(int flags, int type, u_int pktlen) 491 { 492 struct mbuf *m; 493 494 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 495 #ifdef __FreeBSD__ 496 if (pktlen <= MHLEN) 497 MGETHDR(m, flags, type); 498 else 499 m = m_getcl(flags, type, M_PKTHDR); 500 #else 501 MGETHDR(m, flags, type); 502 if (m != NULL && pktlen > MHLEN) 503 MCLGET(m, flags); 504 #endif 505 return m; 506 } 507 508 /* 509 * Send a management frame. The node is for the destination (or ic_bss 510 * when in station mode). Nodes other than ic_bss have their reference 511 * count bumped to reflect our use for an indeterminant time. 512 */ 513 int 514 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 515 int type, int arg) 516 { 517 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 518 struct ifnet *ifp = &ic->ic_if; 519 struct mbuf *m; 520 u_int8_t *frm; 521 enum ieee80211_phymode mode; 522 u_int16_t capinfo; 523 int has_challenge, is_shared_key, ret, timer; 524 525 IASSERT(ni != NULL, ("null node")); 526 527 /* 528 * Hold a reference on the node so it doesn't go away until after 529 * the xmit is complete all the way in the driver. On error we 530 * will remove our reference. 531 */ 532 ieee80211_ref_node(ni); 533 timer = 0; 534 switch (type) { 535 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 536 /* 537 * prreq frame format 538 * [tlv] ssid 539 * [tlv] supported rates 540 * [tlv] extended supported rates 541 */ 542 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 543 2 + ic->ic_des_esslen 544 + 2 + IEEE80211_RATE_SIZE 545 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 546 if (m == NULL) 547 senderr(ENOMEM, is_tx_nombuf); 548 m->m_data += sizeof(struct ieee80211_frame); 549 frm = mtod(m, u_int8_t *); 550 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 551 mode = ieee80211_chan2mode(ic, ni->ni_chan); 552 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 553 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 554 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 555 556 timer = IEEE80211_TRANS_WAIT; 557 break; 558 559 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 560 /* 561 * probe response frame format 562 * [8] time stamp 563 * [2] beacon interval 564 * [2] cabability information 565 * [tlv] ssid 566 * [tlv] supported rates 567 * [tlv] parameter set (FH/DS) 568 * [tlv] parameter set (IBSS) 569 * [tlv] extended supported rates 570 */ 571 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 572 8 + 2 + 2 + 2 573 + 2 + ni->ni_esslen 574 + 2 + IEEE80211_RATE_SIZE 575 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 576 + 6 577 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 578 if (m == NULL) 579 senderr(ENOMEM, is_tx_nombuf); 580 m->m_data += sizeof(struct ieee80211_frame); 581 frm = mtod(m, u_int8_t *); 582 583 memset(frm, 0, 8); /* timestamp should be filled later */ 584 frm += 8; 585 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 586 frm += 2; 587 if (ic->ic_opmode == IEEE80211_M_IBSS) 588 capinfo = IEEE80211_CAPINFO_IBSS; 589 else 590 capinfo = IEEE80211_CAPINFO_ESS; 591 if (ic->ic_flags & IEEE80211_F_PRIVACY) 592 capinfo |= IEEE80211_CAPINFO_PRIVACY; 593 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 594 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 595 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 596 *(u_int16_t *)frm = htole16(capinfo); 597 frm += 2; 598 599 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 600 ic->ic_bss->ni_esslen); 601 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 602 603 if (ic->ic_phytype == IEEE80211_T_FH) { 604 *frm++ = IEEE80211_ELEMID_FHPARMS; 605 *frm++ = 5; 606 *frm++ = ni->ni_fhdwell & 0x00ff; 607 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 608 *frm++ = IEEE80211_FH_CHANSET( 609 ieee80211_chan2ieee(ic, ni->ni_chan)); 610 *frm++ = IEEE80211_FH_CHANPAT( 611 ieee80211_chan2ieee(ic, ni->ni_chan)); 612 *frm++ = ni->ni_fhindex; 613 } else { 614 *frm++ = IEEE80211_ELEMID_DSPARMS; 615 *frm++ = 1; 616 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 617 } 618 619 if (ic->ic_opmode == IEEE80211_M_IBSS) { 620 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 621 *frm++ = 2; 622 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 623 } else { /* IEEE80211_M_HOSTAP */ 624 /* TODO: TIM */ 625 *frm++ = IEEE80211_ELEMID_TIM; 626 *frm++ = 4; /* length */ 627 *frm++ = 0; /* DTIM count */ 628 *frm++ = 1; /* DTIM period */ 629 *frm++ = 0; /* bitmap control */ 630 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 631 } 632 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 633 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 634 break; 635 636 case IEEE80211_FC0_SUBTYPE_AUTH: 637 MGETHDR(m, M_DONTWAIT, MT_DATA); 638 if (m == NULL) 639 senderr(ENOMEM, is_tx_nombuf); 640 641 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 642 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 643 ni->ni_challenge != NULL); 644 645 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 646 arg == IEEE80211_AUTH_SHARED_PASS); 647 648 if (has_challenge) { 649 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 650 m->m_pkthdr.len = m->m_len = 651 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 652 } else { 653 MH_ALIGN(m, 2 * 3); 654 m->m_pkthdr.len = m->m_len = 2 * 3; 655 } 656 frm = mtod(m, u_int8_t *); 657 ((u_int16_t *)frm)[0] = 658 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 659 : htole16(IEEE80211_AUTH_ALG_OPEN); 660 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 661 ((u_int16_t *)frm)[2] = 0; /* status */ 662 663 if (has_challenge) { 664 ((u_int16_t *)frm)[3] = 665 htole16((IEEE80211_CHALLENGE_LEN << 8) | 666 IEEE80211_ELEMID_CHALLENGE); 667 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 668 IEEE80211_CHALLENGE_LEN); 669 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 670 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 671 ("%s: request encrypt frame\n", __func__)); 672 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 673 } 674 } 675 if (ic->ic_opmode == IEEE80211_M_STA) 676 timer = IEEE80211_TRANS_WAIT; 677 break; 678 679 case IEEE80211_FC0_SUBTYPE_DEAUTH: 680 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 681 ("send station %s deauthenticate (reason %d)\n", 682 ether_sprintf(ni->ni_macaddr), arg)); 683 MGETHDR(m, M_DONTWAIT, MT_DATA); 684 if (m == NULL) 685 senderr(ENOMEM, is_tx_nombuf); 686 MH_ALIGN(m, 2); 687 m->m_pkthdr.len = m->m_len = 2; 688 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 689 break; 690 691 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 692 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 693 /* 694 * asreq frame format 695 * [2] capability information 696 * [2] listen interval 697 * [6*] current AP address (reassoc only) 698 * [tlv] ssid 699 * [tlv] supported rates 700 * [tlv] extended supported rates 701 */ 702 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 703 sizeof(capinfo) 704 + sizeof(u_int16_t) 705 + IEEE80211_ADDR_LEN 706 + 2 + ni->ni_esslen 707 + 2 + IEEE80211_RATE_SIZE 708 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 709 if (m == NULL) 710 senderr(ENOMEM, is_tx_nombuf); 711 m->m_data += sizeof(struct ieee80211_frame); 712 frm = mtod(m, u_int8_t *); 713 714 capinfo = 0; 715 if (ic->ic_opmode == IEEE80211_M_IBSS) 716 capinfo |= IEEE80211_CAPINFO_IBSS; 717 else /* IEEE80211_M_STA */ 718 capinfo |= IEEE80211_CAPINFO_ESS; 719 if (ic->ic_flags & IEEE80211_F_PRIVACY) 720 capinfo |= IEEE80211_CAPINFO_PRIVACY; 721 /* 722 * NB: Some 11a AP's reject the request when 723 * short premable is set. 724 */ 725 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 726 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 727 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 728 if (ic->ic_flags & IEEE80211_F_SHSLOT) 729 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 730 *(u_int16_t *)frm = htole16(capinfo); 731 frm += 2; 732 733 *(u_int16_t *)frm = htole16(ic->ic_lintval); 734 frm += 2; 735 736 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 737 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 738 frm += IEEE80211_ADDR_LEN; 739 } 740 741 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 742 frm = ieee80211_add_rates(frm, &ni->ni_rates); 743 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 744 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 745 746 timer = IEEE80211_TRANS_WAIT; 747 break; 748 749 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 750 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 751 /* 752 * asreq frame format 753 * [2] capability information 754 * [2] status 755 * [2] association ID 756 * [tlv] supported rates 757 * [tlv] extended supported rates 758 */ 759 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 760 sizeof(capinfo) 761 + sizeof(u_int16_t) 762 + sizeof(u_int16_t) 763 + 2 + IEEE80211_RATE_SIZE 764 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 765 if (m == NULL) 766 senderr(ENOMEM, is_tx_nombuf); 767 m->m_data += sizeof(struct ieee80211_frame); 768 frm = mtod(m, u_int8_t *); 769 770 capinfo = IEEE80211_CAPINFO_ESS; 771 if (ic->ic_flags & IEEE80211_F_PRIVACY) 772 capinfo |= IEEE80211_CAPINFO_PRIVACY; 773 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 774 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 775 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 776 *(u_int16_t *)frm = htole16(capinfo); 777 frm += 2; 778 779 *(u_int16_t *)frm = htole16(arg); /* status */ 780 frm += 2; 781 782 if (arg == IEEE80211_STATUS_SUCCESS) 783 *(u_int16_t *)frm = htole16(ni->ni_associd); 784 frm += 2; 785 786 frm = ieee80211_add_rates(frm, &ni->ni_rates); 787 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 788 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 789 break; 790 791 case IEEE80211_FC0_SUBTYPE_DISASSOC: 792 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 793 ("send station %s disassociate (reason %d)\n", 794 ether_sprintf(ni->ni_macaddr), arg)); 795 MGETHDR(m, M_DONTWAIT, MT_DATA); 796 if (m == NULL) 797 senderr(ENOMEM, is_tx_nombuf); 798 MH_ALIGN(m, 2); 799 m->m_pkthdr.len = m->m_len = 2; 800 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 801 break; 802 803 default: 804 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 805 ("%s: invalid mgmt frame type %u\n", __func__, type)); 806 senderr(EINVAL, is_tx_unknownmgt); 807 /* NOTREACHED */ 808 } 809 810 ret = ieee80211_mgmt_output(ifp, ni, m, type); 811 if (ret == 0) { 812 if (timer) 813 ic->ic_mgt_timer = timer; 814 } else { 815 bad: 816 ieee80211_release_node(ic, ni); 817 } 818 return ret; 819 #undef senderr 820 } 821 822 void 823 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 824 struct mbuf *m) 825 { 826 /* Store the new packet on our queue, changing the TIM if necessary */ 827 828 if (IF_IS_EMPTY(&ni->ni_savedq)) { 829 ic->ic_set_tim(ic, ni->ni_associd, 1); 830 } 831 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 832 IF_DROP(&ni->ni_savedq); 833 m_freem(m); 834 if (ic->ic_if.if_flags & IFF_DEBUG) 835 printf("%s: station %s power save queue overflow" 836 " of size %d drops %d\n", 837 ic->ic_if.if_xname, 838 ether_sprintf(ni->ni_macaddr), 839 IEEE80211_PS_MAX_QUEUE, 840 ni->ni_savedq.ifq_drops); 841 } else { 842 /* Similar to ieee80211_mgmt_output, store the node in 843 * the rcvif field. 844 */ 845 IF_ENQUEUE(&ni->ni_savedq, m); 846 m->m_pkthdr.rcvif = (void *)ni; 847 } 848 } 849 850
Indexes created Mon Sep 22 13:09:51 GMT 2025