ieee80211_output.c revision 1.23
1 /* $NetBSD: ieee80211_output.c,v 1.23 2004/12/27 09:25:05 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 1.23 2004/12/27 09:25:05 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 #if 0 317 /* RTS is always sent at 1 Mb/s. (XXX Really?) */ 318 d->d_rts_plcp_len = sizeof(struct ieee80211_frame_rts) * 8; 319 #endif 320 d->d_residue = 0; 321 data_dur = (bitlen * 2) / rate; 322 remainder = (bitlen * 2) % rate; 323 if (remainder != 0) { 324 d->d_residue = (rate - remainder) / 16; 325 data_dur++; 326 } 327 328 switch (rate) { 329 case 2: /* 1 Mb/s */ 330 case 4: /* 2 Mb/s */ 331 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 332 ctsrate = 2; 333 break; 334 case 11: /* 5.5 Mb/s */ 335 case 22: /* 11 Mb/s */ 336 case 44: /* 22 Mb/s */ 337 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 338 ctsrate = 4; 339 break; 340 default: 341 /* TBD */ 342 return -1; 343 } 344 345 d->d_plcp_len = data_dur; 346 347 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 348 349 d->d_rts_dur = 350 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 351 pre + data_dur + 352 ack; 353 354 d->d_data_dur = ack; 355 356 return 0; 357 } 358 359 /* 360 * Arguments in: 361 * 362 * wh: 802.11 header 363 * 364 * paylen: payload length (no FCS, no WEP header) 365 * 366 * rate: MSDU speed, units 500kb/s 367 * 368 * fraglen: fragment length, set to maximum (or higher) for no 369 * fragmentation 370 * 371 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 372 * IEEE80211_F_SHPREAMBLE (use short preamble), 373 * IEEE80211_F_SHSLOT (use short slot length) 374 * 375 * Arguments out: 376 * 377 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 378 * of first/only fragment 379 * 380 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 381 * of first/only fragment 382 */ 383 int 384 ieee80211_compute_duration(struct ieee80211_frame *wh, int len, 385 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 386 struct ieee80211_duration *dn, int *npktp, int debug) 387 { 388 int ack, rc; 389 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 390 391 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 392 hdrlen = sizeof(struct ieee80211_frame_addr4); 393 else 394 hdrlen = sizeof(struct ieee80211_frame); 395 396 paylen = len - hdrlen; 397 398 if ((flags & IEEE80211_F_PRIVACY) != 0) { 399 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 400 #if 0 /* 802.11 lets us extend a fragment's length by the length of 401 * a WEP header, AFTER fragmentation. Might want to disable 402 * this while fancy link adaptations are running. 403 */ 404 fraglen -= IEEE80211_WEP_TOTLEN; 405 #endif 406 #if 0 /* Ditto CRC? */ 407 fraglen -= IEEE80211_CRC_LEN; 408 #endif 409 } else 410 overlen = IEEE80211_CRC_LEN; 411 412 npkt = paylen / fraglen; 413 lastlen0 = paylen % fraglen; 414 415 if (npkt == 0) { 416 /* no fragments */ 417 lastlen = paylen + overlen; 418 } else if (lastlen0 != 0) { 419 /* a short fragment */ 420 lastlen = lastlen0 + overlen; 421 npkt++; 422 } else 423 lastlen = fraglen + overlen; 424 425 if (npktp != NULL) 426 *npktp = npkt; 427 428 if (npkt > 1) 429 firstlen = fraglen + overlen; 430 else 431 firstlen = paylen + overlen; 432 433 if (debug) { 434 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 435 "fraglen %d overlen %d len %d rate %d flags %08x\n", 436 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 437 overlen, len, rate, flags); 438 } 439 440 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 441 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 442 443 rc = ieee80211_compute_duration1(firstlen + hdrlen, 444 ack, flags, rate, d0); 445 if (rc == -1) 446 return rc; 447 448 if (npkt <= 1) { 449 *dn = *d0; 450 return 0; 451 } 452 return ieee80211_compute_duration1(lastlen + hdrlen, ack, flags, rate, 453 dn); 454 } 455 456 /* 457 * Add a supported rates element id to a frame. 458 */ 459 u_int8_t * 460 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 461 { 462 int nrates; 463 464 *frm++ = IEEE80211_ELEMID_RATES; 465 nrates = rs->rs_nrates; 466 if (nrates > IEEE80211_RATE_SIZE) 467 nrates = IEEE80211_RATE_SIZE; 468 *frm++ = nrates; 469 memcpy(frm, rs->rs_rates, nrates); 470 return frm + nrates; 471 } 472 473 /* 474 * Add an extended supported rates element id to a frame. 475 */ 476 u_int8_t * 477 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 478 { 479 /* 480 * Add an extended supported rates element if operating in 11g mode. 481 */ 482 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 483 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 484 *frm++ = IEEE80211_ELEMID_XRATES; 485 *frm++ = nrates; 486 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 487 frm += nrates; 488 } 489 return frm; 490 } 491 492 /* 493 * Add an ssid elemet to a frame. 494 */ 495 static u_int8_t * 496 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 497 { 498 *frm++ = IEEE80211_ELEMID_SSID; 499 *frm++ = len; 500 memcpy(frm, ssid, len); 501 return frm + len; 502 } 503 504 static struct mbuf * 505 ieee80211_getmbuf(int flags, int type, u_int pktlen) 506 { 507 struct mbuf *m; 508 509 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 510 #ifdef __FreeBSD__ 511 if (pktlen <= MHLEN) 512 MGETHDR(m, flags, type); 513 else 514 m = m_getcl(flags, type, M_PKTHDR); 515 #else 516 MGETHDR(m, flags, type); 517 if (m != NULL && pktlen > MHLEN) 518 MCLGET(m, flags); 519 #endif 520 return m; 521 } 522 523 /* 524 * Send a management frame. The node is for the destination (or ic_bss 525 * when in station mode). Nodes other than ic_bss have their reference 526 * count bumped to reflect our use for an indeterminant time. 527 */ 528 int 529 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 530 int type, int arg) 531 { 532 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 533 struct ifnet *ifp = &ic->ic_if; 534 struct mbuf *m; 535 u_int8_t *frm; 536 enum ieee80211_phymode mode; 537 u_int16_t capinfo; 538 int has_challenge, is_shared_key, ret, timer; 539 540 IASSERT(ni != NULL, ("null node")); 541 542 /* 543 * Hold a reference on the node so it doesn't go away until after 544 * the xmit is complete all the way in the driver. On error we 545 * will remove our reference. 546 */ 547 ieee80211_ref_node(ni); 548 timer = 0; 549 switch (type) { 550 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 551 /* 552 * prreq frame format 553 * [tlv] ssid 554 * [tlv] supported rates 555 * [tlv] extended supported rates 556 */ 557 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 558 2 + ic->ic_des_esslen 559 + 2 + IEEE80211_RATE_SIZE 560 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 561 if (m == NULL) 562 senderr(ENOMEM, is_tx_nombuf); 563 m->m_data += sizeof(struct ieee80211_frame); 564 frm = mtod(m, u_int8_t *); 565 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 566 mode = ieee80211_chan2mode(ic, ni->ni_chan); 567 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 568 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 569 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 570 571 timer = IEEE80211_TRANS_WAIT; 572 break; 573 574 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 575 /* 576 * probe response frame format 577 * [8] time stamp 578 * [2] beacon interval 579 * [2] cabability information 580 * [tlv] ssid 581 * [tlv] supported rates 582 * [tlv] parameter set (FH/DS) 583 * [tlv] parameter set (IBSS) 584 * [tlv] extended supported rates 585 */ 586 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 587 8 + 2 + 2 + 2 588 + 2 + ni->ni_esslen 589 + 2 + IEEE80211_RATE_SIZE 590 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 591 + 6 592 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 593 if (m == NULL) 594 senderr(ENOMEM, is_tx_nombuf); 595 m->m_data += sizeof(struct ieee80211_frame); 596 frm = mtod(m, u_int8_t *); 597 598 memset(frm, 0, 8); /* timestamp should be filled later */ 599 frm += 8; 600 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 601 frm += 2; 602 if (ic->ic_opmode == IEEE80211_M_IBSS) 603 capinfo = IEEE80211_CAPINFO_IBSS; 604 else 605 capinfo = IEEE80211_CAPINFO_ESS; 606 if (ic->ic_flags & IEEE80211_F_PRIVACY) 607 capinfo |= IEEE80211_CAPINFO_PRIVACY; 608 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 609 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 610 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 611 *(u_int16_t *)frm = htole16(capinfo); 612 frm += 2; 613 614 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 615 ic->ic_bss->ni_esslen); 616 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 617 618 if (ic->ic_phytype == IEEE80211_T_FH) { 619 *frm++ = IEEE80211_ELEMID_FHPARMS; 620 *frm++ = 5; 621 *frm++ = ni->ni_fhdwell & 0x00ff; 622 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 623 *frm++ = IEEE80211_FH_CHANSET( 624 ieee80211_chan2ieee(ic, ni->ni_chan)); 625 *frm++ = IEEE80211_FH_CHANPAT( 626 ieee80211_chan2ieee(ic, ni->ni_chan)); 627 *frm++ = ni->ni_fhindex; 628 } else { 629 *frm++ = IEEE80211_ELEMID_DSPARMS; 630 *frm++ = 1; 631 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 632 } 633 634 if (ic->ic_opmode == IEEE80211_M_IBSS) { 635 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 636 *frm++ = 2; 637 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 638 } else { /* IEEE80211_M_HOSTAP */ 639 /* TODO: TIM */ 640 *frm++ = IEEE80211_ELEMID_TIM; 641 *frm++ = 4; /* length */ 642 *frm++ = 0; /* DTIM count */ 643 *frm++ = 1; /* DTIM period */ 644 *frm++ = 0; /* bitmap control */ 645 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 646 } 647 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 648 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 649 break; 650 651 case IEEE80211_FC0_SUBTYPE_AUTH: 652 MGETHDR(m, M_DONTWAIT, MT_DATA); 653 if (m == NULL) 654 senderr(ENOMEM, is_tx_nombuf); 655 656 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 657 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 658 ni->ni_challenge != NULL); 659 660 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 661 arg == IEEE80211_AUTH_SHARED_PASS); 662 663 if (has_challenge) { 664 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 665 m->m_pkthdr.len = m->m_len = 666 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 667 } else { 668 MH_ALIGN(m, 2 * 3); 669 m->m_pkthdr.len = m->m_len = 2 * 3; 670 } 671 frm = mtod(m, u_int8_t *); 672 ((u_int16_t *)frm)[0] = 673 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 674 : htole16(IEEE80211_AUTH_ALG_OPEN); 675 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 676 ((u_int16_t *)frm)[2] = 0; /* status */ 677 678 if (has_challenge) { 679 ((u_int16_t *)frm)[3] = 680 htole16((IEEE80211_CHALLENGE_LEN << 8) | 681 IEEE80211_ELEMID_CHALLENGE); 682 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 683 IEEE80211_CHALLENGE_LEN); 684 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 685 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 686 ("%s: request encrypt frame\n", __func__)); 687 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 688 } 689 } 690 if (ic->ic_opmode == IEEE80211_M_STA) 691 timer = IEEE80211_TRANS_WAIT; 692 break; 693 694 case IEEE80211_FC0_SUBTYPE_DEAUTH: 695 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 696 ("send station %s deauthenticate (reason %d)\n", 697 ether_sprintf(ni->ni_macaddr), arg)); 698 MGETHDR(m, M_DONTWAIT, MT_DATA); 699 if (m == NULL) 700 senderr(ENOMEM, is_tx_nombuf); 701 MH_ALIGN(m, 2); 702 m->m_pkthdr.len = m->m_len = 2; 703 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 704 break; 705 706 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 707 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 708 /* 709 * asreq frame format 710 * [2] capability information 711 * [2] listen interval 712 * [6*] current AP address (reassoc only) 713 * [tlv] ssid 714 * [tlv] supported rates 715 * [tlv] extended supported rates 716 */ 717 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 718 sizeof(capinfo) 719 + sizeof(u_int16_t) 720 + IEEE80211_ADDR_LEN 721 + 2 + ni->ni_esslen 722 + 2 + IEEE80211_RATE_SIZE 723 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 724 if (m == NULL) 725 senderr(ENOMEM, is_tx_nombuf); 726 m->m_data += sizeof(struct ieee80211_frame); 727 frm = mtod(m, u_int8_t *); 728 729 capinfo = 0; 730 if (ic->ic_opmode == IEEE80211_M_IBSS) 731 capinfo |= IEEE80211_CAPINFO_IBSS; 732 else /* IEEE80211_M_STA */ 733 capinfo |= IEEE80211_CAPINFO_ESS; 734 if (ic->ic_flags & IEEE80211_F_PRIVACY) 735 capinfo |= IEEE80211_CAPINFO_PRIVACY; 736 /* 737 * NB: Some 11a AP's reject the request when 738 * short premable is set. 739 */ 740 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 741 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 742 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 743 if (ic->ic_flags & IEEE80211_F_SHSLOT) 744 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 745 *(u_int16_t *)frm = htole16(capinfo); 746 frm += 2; 747 748 *(u_int16_t *)frm = htole16(ic->ic_lintval); 749 frm += 2; 750 751 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 752 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 753 frm += IEEE80211_ADDR_LEN; 754 } 755 756 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 757 frm = ieee80211_add_rates(frm, &ni->ni_rates); 758 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 759 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 760 761 timer = IEEE80211_TRANS_WAIT; 762 break; 763 764 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 765 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 766 /* 767 * asreq frame format 768 * [2] capability information 769 * [2] status 770 * [2] association ID 771 * [tlv] supported rates 772 * [tlv] extended supported rates 773 */ 774 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 775 sizeof(capinfo) 776 + sizeof(u_int16_t) 777 + sizeof(u_int16_t) 778 + 2 + IEEE80211_RATE_SIZE 779 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 780 if (m == NULL) 781 senderr(ENOMEM, is_tx_nombuf); 782 m->m_data += sizeof(struct ieee80211_frame); 783 frm = mtod(m, u_int8_t *); 784 785 capinfo = IEEE80211_CAPINFO_ESS; 786 if (ic->ic_flags & IEEE80211_F_PRIVACY) 787 capinfo |= IEEE80211_CAPINFO_PRIVACY; 788 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 789 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 790 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 791 *(u_int16_t *)frm = htole16(capinfo); 792 frm += 2; 793 794 *(u_int16_t *)frm = htole16(arg); /* status */ 795 frm += 2; 796 797 if (arg == IEEE80211_STATUS_SUCCESS) 798 *(u_int16_t *)frm = htole16(ni->ni_associd); 799 frm += 2; 800 801 frm = ieee80211_add_rates(frm, &ni->ni_rates); 802 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 803 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 804 break; 805 806 case IEEE80211_FC0_SUBTYPE_DISASSOC: 807 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 808 ("send station %s disassociate (reason %d)\n", 809 ether_sprintf(ni->ni_macaddr), arg)); 810 MGETHDR(m, M_DONTWAIT, MT_DATA); 811 if (m == NULL) 812 senderr(ENOMEM, is_tx_nombuf); 813 MH_ALIGN(m, 2); 814 m->m_pkthdr.len = m->m_len = 2; 815 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 816 break; 817 818 default: 819 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 820 ("%s: invalid mgmt frame type %u\n", __func__, type)); 821 senderr(EINVAL, is_tx_unknownmgt); 822 /* NOTREACHED */ 823 } 824 825 ret = ieee80211_mgmt_output(ifp, ni, m, type); 826 if (ret == 0) { 827 if (timer) 828 ic->ic_mgt_timer = timer; 829 } else { 830 bad: 831 ieee80211_release_node(ic, ni); 832 } 833 return ret; 834 #undef senderr 835 } 836 837 void 838 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 839 struct mbuf *m) 840 { 841 /* Store the new packet on our queue, changing the TIM if necessary */ 842 843 if (IF_IS_EMPTY(&ni->ni_savedq)) { 844 ic->ic_set_tim(ic, ni->ni_associd, 1); 845 } 846 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 847 IF_DROP(&ni->ni_savedq); 848 m_freem(m); 849 if (ic->ic_if.if_flags & IFF_DEBUG) 850 printf("%s: station %s power save queue overflow" 851 " of size %d drops %d\n", 852 ic->ic_if.if_xname, 853 ether_sprintf(ni->ni_macaddr), 854 IEEE80211_PS_MAX_QUEUE, 855 ni->ni_savedq.ifq_drops); 856 } else { 857 /* Similar to ieee80211_mgmt_output, store the node in 858 * the rcvif field. 859 */ 860 IF_ENQUEUE(&ni->ni_savedq, m); 861 m->m_pkthdr.rcvif = (void *)ni; 862 } 863 } 864 865
Indexes created Mon Sep 22 05:09:51 GMT 2025