ieee80211_output.c revision 1.25
1 /* $NetBSD: ieee80211_output.c,v 1.25 2005/01/04 00:36:18 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 1.25 2005/01/04 00:36:18 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 MGETHDR(m, flags, type); 496 if (m != NULL && pktlen > MHLEN) { 497 MCLGET(m, flags); 498 if ((m->m_flags & M_EXT) == 0) { 499 m_free(m); 500 m = NULL; 501 } 502 } 503 return m; 504 } 505 506 /* 507 * Send a management frame. The node is for the destination (or ic_bss 508 * when in station mode). Nodes other than ic_bss have their reference 509 * count bumped to reflect our use for an indeterminant time. 510 */ 511 int 512 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 513 int type, int arg) 514 { 515 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 516 struct ifnet *ifp = &ic->ic_if; 517 struct mbuf *m; 518 u_int8_t *frm; 519 enum ieee80211_phymode mode; 520 u_int16_t capinfo; 521 int has_challenge, is_shared_key, ret, timer; 522 523 IASSERT(ni != NULL, ("null node")); 524 525 /* 526 * Hold a reference on the node so it doesn't go away until after 527 * the xmit is complete all the way in the driver. On error we 528 * will remove our reference. 529 */ 530 ieee80211_ref_node(ni); 531 timer = 0; 532 switch (type) { 533 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 534 /* 535 * prreq frame format 536 * [tlv] ssid 537 * [tlv] supported rates 538 * [tlv] extended supported rates 539 */ 540 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 541 2 + ic->ic_des_esslen 542 + 2 + IEEE80211_RATE_SIZE 543 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 544 if (m == NULL) 545 senderr(ENOMEM, is_tx_nombuf); 546 m->m_data += sizeof(struct ieee80211_frame); 547 frm = mtod(m, u_int8_t *); 548 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 549 mode = ieee80211_chan2mode(ic, ni->ni_chan); 550 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 551 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 552 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 553 554 timer = IEEE80211_TRANS_WAIT; 555 break; 556 557 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 558 /* 559 * probe response frame format 560 * [8] time stamp 561 * [2] beacon interval 562 * [2] cabability information 563 * [tlv] ssid 564 * [tlv] supported rates 565 * [tlv] parameter set (FH/DS) 566 * [tlv] parameter set (IBSS) 567 * [tlv] extended supported rates 568 */ 569 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 570 8 + 2 + 2 + 2 571 + 2 + ni->ni_esslen 572 + 2 + IEEE80211_RATE_SIZE 573 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 574 + 6 575 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 576 if (m == NULL) 577 senderr(ENOMEM, is_tx_nombuf); 578 m->m_data += sizeof(struct ieee80211_frame); 579 frm = mtod(m, u_int8_t *); 580 581 memset(frm, 0, 8); /* timestamp should be filled later */ 582 frm += 8; 583 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 584 frm += 2; 585 if (ic->ic_opmode == IEEE80211_M_IBSS) 586 capinfo = IEEE80211_CAPINFO_IBSS; 587 else 588 capinfo = IEEE80211_CAPINFO_ESS; 589 if (ic->ic_flags & IEEE80211_F_PRIVACY) 590 capinfo |= IEEE80211_CAPINFO_PRIVACY; 591 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 592 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 593 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 594 *(u_int16_t *)frm = htole16(capinfo); 595 frm += 2; 596 597 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 598 ic->ic_bss->ni_esslen); 599 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 600 601 if (ic->ic_phytype == IEEE80211_T_FH) { 602 *frm++ = IEEE80211_ELEMID_FHPARMS; 603 *frm++ = 5; 604 *frm++ = ni->ni_fhdwell & 0x00ff; 605 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 606 *frm++ = IEEE80211_FH_CHANSET( 607 ieee80211_chan2ieee(ic, ni->ni_chan)); 608 *frm++ = IEEE80211_FH_CHANPAT( 609 ieee80211_chan2ieee(ic, ni->ni_chan)); 610 *frm++ = ni->ni_fhindex; 611 } else { 612 *frm++ = IEEE80211_ELEMID_DSPARMS; 613 *frm++ = 1; 614 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 615 } 616 617 if (ic->ic_opmode == IEEE80211_M_IBSS) { 618 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 619 *frm++ = 2; 620 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 621 } else { /* IEEE80211_M_HOSTAP */ 622 /* TODO: TIM */ 623 *frm++ = IEEE80211_ELEMID_TIM; 624 *frm++ = 4; /* length */ 625 *frm++ = 0; /* DTIM count */ 626 *frm++ = 1; /* DTIM period */ 627 *frm++ = 0; /* bitmap control */ 628 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 629 } 630 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 631 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 632 break; 633 634 case IEEE80211_FC0_SUBTYPE_AUTH: 635 MGETHDR(m, M_DONTWAIT, MT_DATA); 636 if (m == NULL) 637 senderr(ENOMEM, is_tx_nombuf); 638 639 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 640 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 641 ni->ni_challenge != NULL); 642 643 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 644 arg == IEEE80211_AUTH_SHARED_PASS); 645 646 if (has_challenge) { 647 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 648 m->m_pkthdr.len = m->m_len = 649 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 650 } else { 651 MH_ALIGN(m, 2 * 3); 652 m->m_pkthdr.len = m->m_len = 2 * 3; 653 } 654 frm = mtod(m, u_int8_t *); 655 ((u_int16_t *)frm)[0] = 656 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 657 : htole16(IEEE80211_AUTH_ALG_OPEN); 658 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 659 ((u_int16_t *)frm)[2] = 0; /* status */ 660 661 if (has_challenge) { 662 ((u_int16_t *)frm)[3] = 663 htole16((IEEE80211_CHALLENGE_LEN << 8) | 664 IEEE80211_ELEMID_CHALLENGE); 665 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 666 IEEE80211_CHALLENGE_LEN); 667 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 668 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 669 ("%s: request encrypt frame\n", __func__)); 670 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 671 } 672 } 673 if (ic->ic_opmode == IEEE80211_M_STA) 674 timer = IEEE80211_TRANS_WAIT; 675 break; 676 677 case IEEE80211_FC0_SUBTYPE_DEAUTH: 678 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 679 ("send station %s deauthenticate (reason %d)\n", 680 ether_sprintf(ni->ni_macaddr), arg)); 681 MGETHDR(m, M_DONTWAIT, MT_DATA); 682 if (m == NULL) 683 senderr(ENOMEM, is_tx_nombuf); 684 MH_ALIGN(m, 2); 685 m->m_pkthdr.len = m->m_len = 2; 686 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 687 break; 688 689 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 690 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 691 /* 692 * asreq frame format 693 * [2] capability information 694 * [2] listen interval 695 * [6*] current AP address (reassoc only) 696 * [tlv] ssid 697 * [tlv] supported rates 698 * [tlv] extended supported rates 699 */ 700 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 701 sizeof(capinfo) 702 + sizeof(u_int16_t) 703 + IEEE80211_ADDR_LEN 704 + 2 + ni->ni_esslen 705 + 2 + IEEE80211_RATE_SIZE 706 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 707 if (m == NULL) 708 senderr(ENOMEM, is_tx_nombuf); 709 m->m_data += sizeof(struct ieee80211_frame); 710 frm = mtod(m, u_int8_t *); 711 712 capinfo = 0; 713 if (ic->ic_opmode == IEEE80211_M_IBSS) 714 capinfo |= IEEE80211_CAPINFO_IBSS; 715 else /* IEEE80211_M_STA */ 716 capinfo |= IEEE80211_CAPINFO_ESS; 717 if (ic->ic_flags & IEEE80211_F_PRIVACY) 718 capinfo |= IEEE80211_CAPINFO_PRIVACY; 719 /* 720 * NB: Some 11a AP's reject the request when 721 * short premable is set. 722 */ 723 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 724 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 725 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 726 if (ic->ic_flags & IEEE80211_F_SHSLOT) 727 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 728 *(u_int16_t *)frm = htole16(capinfo); 729 frm += 2; 730 731 *(u_int16_t *)frm = htole16(ic->ic_lintval); 732 frm += 2; 733 734 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 735 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 736 frm += IEEE80211_ADDR_LEN; 737 } 738 739 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 740 frm = ieee80211_add_rates(frm, &ni->ni_rates); 741 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 742 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 743 744 timer = IEEE80211_TRANS_WAIT; 745 break; 746 747 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 748 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 749 /* 750 * asreq frame format 751 * [2] capability information 752 * [2] status 753 * [2] association ID 754 * [tlv] supported rates 755 * [tlv] extended supported rates 756 */ 757 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 758 sizeof(capinfo) 759 + sizeof(u_int16_t) 760 + sizeof(u_int16_t) 761 + 2 + IEEE80211_RATE_SIZE 762 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 763 if (m == NULL) 764 senderr(ENOMEM, is_tx_nombuf); 765 m->m_data += sizeof(struct ieee80211_frame); 766 frm = mtod(m, u_int8_t *); 767 768 capinfo = IEEE80211_CAPINFO_ESS; 769 if (ic->ic_flags & IEEE80211_F_PRIVACY) 770 capinfo |= IEEE80211_CAPINFO_PRIVACY; 771 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 772 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 773 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 774 *(u_int16_t *)frm = htole16(capinfo); 775 frm += 2; 776 777 *(u_int16_t *)frm = htole16(arg); /* status */ 778 frm += 2; 779 780 if (arg == IEEE80211_STATUS_SUCCESS) 781 *(u_int16_t *)frm = htole16(ni->ni_associd); 782 frm += 2; 783 784 frm = ieee80211_add_rates(frm, &ni->ni_rates); 785 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 786 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 787 break; 788 789 case IEEE80211_FC0_SUBTYPE_DISASSOC: 790 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 791 ("send station %s disassociate (reason %d)\n", 792 ether_sprintf(ni->ni_macaddr), arg)); 793 MGETHDR(m, M_DONTWAIT, MT_DATA); 794 if (m == NULL) 795 senderr(ENOMEM, is_tx_nombuf); 796 MH_ALIGN(m, 2); 797 m->m_pkthdr.len = m->m_len = 2; 798 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 799 break; 800 801 default: 802 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 803 ("%s: invalid mgmt frame type %u\n", __func__, type)); 804 senderr(EINVAL, is_tx_unknownmgt); 805 /* NOTREACHED */ 806 } 807 808 ret = ieee80211_mgmt_output(ifp, ni, m, type); 809 if (ret == 0) { 810 if (timer) 811 ic->ic_mgt_timer = timer; 812 } else { 813 bad: 814 ieee80211_release_node(ic, ni); 815 } 816 return ret; 817 #undef senderr 818 } 819 820 void 821 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 822 struct mbuf *m) 823 { 824 /* Store the new packet on our queue, changing the TIM if necessary */ 825 826 if (IF_IS_EMPTY(&ni->ni_savedq)) { 827 ic->ic_set_tim(ic, ni->ni_associd, 1); 828 } 829 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 830 IF_DROP(&ni->ni_savedq); 831 m_freem(m); 832 if (ic->ic_if.if_flags & IFF_DEBUG) 833 printf("%s: station %s power save queue overflow" 834 " of size %d drops %d\n", 835 ic->ic_if.if_xname, 836 ether_sprintf(ni->ni_macaddr), 837 IEEE80211_PS_MAX_QUEUE, 838 ni->ni_savedq.ifq_drops); 839 } else { 840 /* Similar to ieee80211_mgmt_output, store the node in 841 * the rcvif field. 842 */ 843 IF_ENQUEUE(&ni->ni_savedq, m); 844 m->m_pkthdr.rcvif = (void *)ni; 845 } 846 } 847 848
Indexes created Fri Sep 26 20:09:58 GMT 2025