ieee80211_output.c revision 1.20
1 /* $NetBSD: ieee80211_output.c,v 1.20 2004/12/27 01:51:49 mycroft 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 1.20 2004/12/27 01:51:49 mycroft 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 data frame, 291 * PLCP Length for data frame, 292 * PLCP Service field for data frame, 293 * 802.11 Duration field for RTS 294 */ 295 static int 296 ieee80211_compute_duration1(int len, uint32_t flags, int rate, 297 struct ieee80211_duration *d) 298 { 299 int ack, bitlen, cts, data_dur, remainder; 300 301 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 302 * DATA reserves medium for SIFS | ACK 303 */ 304 305 bitlen = len * 8; 306 307 #if 0 308 /* RTS is always sent at 1 Mb/s. (XXX Really?) */ 309 d->d_rts_plcp_len = sizeof(struct ieee80211_frame_rts) * 8; 310 #endif 311 d->d_residue = 0; 312 data_dur = (bitlen * 2) / rate; 313 314 switch (rate) { 315 case 2: /* 1 Mb/s */ 316 case 4: /* 2 Mb/s */ 317 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 318 cts = IEEE80211_DUR_DS_SLOW_CTS; 319 ack = IEEE80211_DUR_DS_SLOW_ACK; 320 break; 321 case 11: /* 5.5 Mb/s */ 322 case 22: /* 11 Mb/s */ 323 case 44: /* 22 Mb/s */ 324 remainder = (bitlen * 2) % rate; 325 if (remainder != 0) { 326 data_dur++; 327 d->d_residue = (rate - remainder) / 16; 328 } 329 330 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 331 cts = IEEE80211_DUR_DS_FAST_CTS; 332 ack = IEEE80211_DUR_DS_FAST_ACK; 333 break; 334 default: 335 /* TBD */ 336 return -1; 337 } 338 339 d->d_plcp_len = data_dur; 340 341 d->d_rts_dur = data_dur + 3 * (IEEE80211_DUR_DS_SIFS + 342 IEEE80211_DUR_DS_SHORT_PREAMBLE + 343 IEEE80211_DUR_DS_FAST_PLCPHDR) + cts + ack; 344 345 /* Note that this is the amount of time reserved *after* 346 * the packet is transmitted: just long enough for a SIFS 347 * and an ACK. 348 */ 349 d->d_data_dur = IEEE80211_DUR_DS_SIFS + 350 IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR + 351 ack; 352 353 if ((flags & IEEE80211_F_SHPREAMBLE) != 0) 354 return 0; 355 356 d->d_rts_dur += 3 * IEEE80211_DUR_DS_PREAMBLE_DIFFERENCE + 357 3 * IEEE80211_DUR_DS_PLCPHDR_DIFFERENCE; 358 d->d_data_dur += IEEE80211_DUR_DS_PREAMBLE_DIFFERENCE + 359 IEEE80211_DUR_DS_PLCPHDR_DIFFERENCE; 360 return 0; 361 } 362 363 /* 364 * Arguments in: 365 * 366 * wh: 802.11 header 367 * 368 * paylen: payload length (no FCS, no WEP header) 369 * 370 * rate: MSDU speed, units 500kb/s 371 * 372 * fraglen: fragment length, set to maximum (or higher) for no 373 * fragmentation 374 * 375 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 376 * IEEE80211_F_SHPREAMBLE (use short preamble), 377 * IEEE80211_F_SHSLOT (use short slot length) 378 * 379 * Arguments out: 380 * 381 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 382 * of first/only fragment 383 * 384 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 385 * of first/only fragment 386 */ 387 int 388 ieee80211_compute_duration(struct ieee80211_frame *wh, int len, 389 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 390 struct ieee80211_duration *dn, int *npktp, int debug) 391 { 392 int rc; 393 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 394 395 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 396 hdrlen = sizeof(struct ieee80211_frame_addr4); 397 else 398 hdrlen = sizeof(struct ieee80211_frame); 399 400 paylen = len - hdrlen; 401 402 if ((flags & IEEE80211_F_PRIVACY) != 0) { 403 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 404 #if 0 /* 802.11 lets us extend a fragment's length by the length of 405 * a WEP header, AFTER fragmentation. Might want to disable 406 * this while fancy link adaptations are running. 407 */ 408 fraglen -= IEEE80211_WEP_TOTLEN; 409 #endif 410 #if 0 /* Ditto CRC? */ 411 fraglen -= IEEE80211_CRC_LEN; 412 #endif 413 } else 414 overlen = IEEE80211_CRC_LEN; 415 416 npkt = paylen / fraglen; 417 lastlen0 = paylen % fraglen; 418 419 if (npkt == 0) { 420 /* no fragments */ 421 lastlen = paylen + overlen; 422 } else if (lastlen0 != 0) { 423 /* a short fragment */ 424 lastlen = lastlen0 + overlen; 425 npkt++; 426 } else 427 lastlen = fraglen + overlen; 428 429 if (npktp != NULL) 430 *npktp = npkt; 431 432 if (npkt > 1) 433 firstlen = fraglen + overlen; 434 else 435 firstlen = paylen + overlen; 436 437 if (debug) { 438 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 439 "fraglen %d overlen %d len %d rate %d flags %08x\n", 440 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 441 overlen, len, rate, flags); 442 } 443 rc = ieee80211_compute_duration1(firstlen + hdrlen, flags, rate, d0); 444 if (rc == -1) 445 return rc; 446 447 if (npkt <= 1) { 448 *dn = *d0; 449 return 0; 450 } 451 return ieee80211_compute_duration1(lastlen + hdrlen, flags, rate, dn); 452 } 453 454 /* 455 * Add a supported rates element id to a frame. 456 */ 457 u_int8_t * 458 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 459 { 460 int nrates; 461 462 *frm++ = IEEE80211_ELEMID_RATES; 463 nrates = rs->rs_nrates; 464 if (nrates > IEEE80211_RATE_SIZE) 465 nrates = IEEE80211_RATE_SIZE; 466 *frm++ = nrates; 467 memcpy(frm, rs->rs_rates, nrates); 468 return frm + nrates; 469 } 470 471 /* 472 * Add an extended supported rates element id to a frame. 473 */ 474 u_int8_t * 475 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 476 { 477 /* 478 * Add an extended supported rates element if operating in 11g mode. 479 */ 480 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 481 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 482 *frm++ = IEEE80211_ELEMID_XRATES; 483 *frm++ = nrates; 484 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 485 frm += nrates; 486 } 487 return frm; 488 } 489 490 /* 491 * Add an ssid elemet to a frame. 492 */ 493 static u_int8_t * 494 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 495 { 496 *frm++ = IEEE80211_ELEMID_SSID; 497 *frm++ = len; 498 memcpy(frm, ssid, len); 499 return frm + len; 500 } 501 502 static struct mbuf * 503 ieee80211_getmbuf(int flags, int type, u_int pktlen) 504 { 505 struct mbuf *m; 506 507 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 508 #ifdef __FreeBSD__ 509 if (pktlen <= MHLEN) 510 MGETHDR(m, flags, type); 511 else 512 m = m_getcl(flags, type, M_PKTHDR); 513 #else 514 MGETHDR(m, flags, type); 515 if (m != NULL && pktlen > MHLEN) 516 MCLGET(m, flags); 517 #endif 518 return m; 519 } 520 521 /* 522 * Send a management frame. The node is for the destination (or ic_bss 523 * when in station mode). Nodes other than ic_bss have their reference 524 * count bumped to reflect our use for an indeterminant time. 525 */ 526 int 527 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 528 int type, int arg) 529 { 530 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 531 struct ifnet *ifp = &ic->ic_if; 532 struct mbuf *m; 533 u_int8_t *frm; 534 enum ieee80211_phymode mode; 535 u_int16_t capinfo; 536 int has_challenge, is_shared_key, ret, timer; 537 538 IASSERT(ni != NULL, ("null node")); 539 540 /* 541 * Hold a reference on the node so it doesn't go away until after 542 * the xmit is complete all the way in the driver. On error we 543 * will remove our reference. 544 */ 545 ieee80211_ref_node(ni); 546 timer = 0; 547 switch (type) { 548 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 549 /* 550 * prreq frame format 551 * [tlv] ssid 552 * [tlv] supported rates 553 * [tlv] extended supported rates 554 */ 555 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 556 2 + ic->ic_des_esslen 557 + 2 + IEEE80211_RATE_SIZE 558 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 559 if (m == NULL) 560 senderr(ENOMEM, is_tx_nombuf); 561 m->m_data += sizeof(struct ieee80211_frame); 562 frm = mtod(m, u_int8_t *); 563 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 564 mode = ieee80211_chan2mode(ic, ni->ni_chan); 565 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 566 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 567 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 568 569 timer = IEEE80211_TRANS_WAIT; 570 break; 571 572 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 573 /* 574 * probe response frame format 575 * [8] time stamp 576 * [2] beacon interval 577 * [2] cabability information 578 * [tlv] ssid 579 * [tlv] supported rates 580 * [tlv] parameter set (FH/DS) 581 * [tlv] parameter set (IBSS) 582 * [tlv] extended supported rates 583 */ 584 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 585 8 + 2 + 2 + 2 586 + 2 + ni->ni_esslen 587 + 2 + IEEE80211_RATE_SIZE 588 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 589 + 6 590 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 591 if (m == NULL) 592 senderr(ENOMEM, is_tx_nombuf); 593 m->m_data += sizeof(struct ieee80211_frame); 594 frm = mtod(m, u_int8_t *); 595 596 memset(frm, 0, 8); /* timestamp should be filled later */ 597 frm += 8; 598 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 599 frm += 2; 600 if (ic->ic_opmode == IEEE80211_M_IBSS) 601 capinfo = IEEE80211_CAPINFO_IBSS; 602 else 603 capinfo = IEEE80211_CAPINFO_ESS; 604 if (ic->ic_flags & IEEE80211_F_PRIVACY) 605 capinfo |= IEEE80211_CAPINFO_PRIVACY; 606 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 607 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 608 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 609 *(u_int16_t *)frm = htole16(capinfo); 610 frm += 2; 611 612 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 613 ic->ic_bss->ni_esslen); 614 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 615 616 if (ic->ic_phytype == IEEE80211_T_FH) { 617 *frm++ = IEEE80211_ELEMID_FHPARMS; 618 *frm++ = 5; 619 *frm++ = ni->ni_fhdwell & 0x00ff; 620 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 621 *frm++ = IEEE80211_FH_CHANSET( 622 ieee80211_chan2ieee(ic, ni->ni_chan)); 623 *frm++ = IEEE80211_FH_CHANPAT( 624 ieee80211_chan2ieee(ic, ni->ni_chan)); 625 *frm++ = ni->ni_fhindex; 626 } else { 627 *frm++ = IEEE80211_ELEMID_DSPARMS; 628 *frm++ = 1; 629 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 630 } 631 632 if (ic->ic_opmode == IEEE80211_M_IBSS) { 633 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 634 *frm++ = 2; 635 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 636 } else { /* IEEE80211_M_HOSTAP */ 637 /* TODO: TIM */ 638 *frm++ = IEEE80211_ELEMID_TIM; 639 *frm++ = 4; /* length */ 640 *frm++ = 0; /* DTIM count */ 641 *frm++ = 1; /* DTIM period */ 642 *frm++ = 0; /* bitmap control */ 643 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 644 } 645 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 646 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 647 break; 648 649 case IEEE80211_FC0_SUBTYPE_AUTH: 650 MGETHDR(m, M_DONTWAIT, MT_DATA); 651 if (m == NULL) 652 senderr(ENOMEM, is_tx_nombuf); 653 654 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 655 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 656 ni->ni_challenge != NULL); 657 658 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 659 arg == IEEE80211_AUTH_SHARED_PASS); 660 661 if (has_challenge) { 662 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 663 m->m_pkthdr.len = m->m_len = 664 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 665 } else { 666 MH_ALIGN(m, 2 * 3); 667 m->m_pkthdr.len = m->m_len = 2 * 3; 668 } 669 frm = mtod(m, u_int8_t *); 670 ((u_int16_t *)frm)[0] = 671 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 672 : htole16(IEEE80211_AUTH_ALG_OPEN); 673 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 674 ((u_int16_t *)frm)[2] = 0; /* status */ 675 676 if (has_challenge) { 677 ((u_int16_t *)frm)[3] = 678 htole16((IEEE80211_CHALLENGE_LEN << 8) | 679 IEEE80211_ELEMID_CHALLENGE); 680 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 681 IEEE80211_CHALLENGE_LEN); 682 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 683 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 684 ("%s: request encrypt frame\n", __func__)); 685 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 686 } 687 } 688 if (ic->ic_opmode == IEEE80211_M_STA) 689 timer = IEEE80211_TRANS_WAIT; 690 break; 691 692 case IEEE80211_FC0_SUBTYPE_DEAUTH: 693 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 694 ("send station %s deauthenticate (reason %d)\n", 695 ether_sprintf(ni->ni_macaddr), arg)); 696 MGETHDR(m, M_DONTWAIT, MT_DATA); 697 if (m == NULL) 698 senderr(ENOMEM, is_tx_nombuf); 699 MH_ALIGN(m, 2); 700 m->m_pkthdr.len = m->m_len = 2; 701 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 702 break; 703 704 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 705 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 706 /* 707 * asreq frame format 708 * [2] capability information 709 * [2] listen interval 710 * [6*] current AP address (reassoc only) 711 * [tlv] ssid 712 * [tlv] supported rates 713 * [tlv] extended supported rates 714 */ 715 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 716 sizeof(capinfo) 717 + sizeof(u_int16_t) 718 + IEEE80211_ADDR_LEN 719 + 2 + ni->ni_esslen 720 + 2 + IEEE80211_RATE_SIZE 721 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 722 if (m == NULL) 723 senderr(ENOMEM, is_tx_nombuf); 724 m->m_data += sizeof(struct ieee80211_frame); 725 frm = mtod(m, u_int8_t *); 726 727 capinfo = 0; 728 if (ic->ic_opmode == IEEE80211_M_IBSS) 729 capinfo |= IEEE80211_CAPINFO_IBSS; 730 else /* IEEE80211_M_STA */ 731 capinfo |= IEEE80211_CAPINFO_ESS; 732 if (ic->ic_flags & IEEE80211_F_PRIVACY) 733 capinfo |= IEEE80211_CAPINFO_PRIVACY; 734 /* 735 * NB: Some 11a AP's reject the request when 736 * short premable is set. 737 */ 738 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 739 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 740 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 741 if (ic->ic_flags & IEEE80211_F_SHSLOT) 742 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 743 *(u_int16_t *)frm = htole16(capinfo); 744 frm += 2; 745 746 *(u_int16_t *)frm = htole16(ic->ic_lintval); 747 frm += 2; 748 749 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 750 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 751 frm += IEEE80211_ADDR_LEN; 752 } 753 754 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 755 frm = ieee80211_add_rates(frm, &ni->ni_rates); 756 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 757 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 758 759 timer = IEEE80211_TRANS_WAIT; 760 break; 761 762 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 763 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 764 /* 765 * asreq frame format 766 * [2] capability information 767 * [2] status 768 * [2] association ID 769 * [tlv] supported rates 770 * [tlv] extended supported rates 771 */ 772 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 773 sizeof(capinfo) 774 + sizeof(u_int16_t) 775 + sizeof(u_int16_t) 776 + 2 + IEEE80211_RATE_SIZE 777 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 778 if (m == NULL) 779 senderr(ENOMEM, is_tx_nombuf); 780 m->m_data += sizeof(struct ieee80211_frame); 781 frm = mtod(m, u_int8_t *); 782 783 capinfo = IEEE80211_CAPINFO_ESS; 784 if (ic->ic_flags & IEEE80211_F_PRIVACY) 785 capinfo |= IEEE80211_CAPINFO_PRIVACY; 786 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 787 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 788 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 789 *(u_int16_t *)frm = htole16(capinfo); 790 frm += 2; 791 792 *(u_int16_t *)frm = htole16(arg); /* status */ 793 frm += 2; 794 795 if (arg == IEEE80211_STATUS_SUCCESS) 796 *(u_int16_t *)frm = htole16(ni->ni_associd); 797 frm += 2; 798 799 frm = ieee80211_add_rates(frm, &ni->ni_rates); 800 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 801 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 802 break; 803 804 case IEEE80211_FC0_SUBTYPE_DISASSOC: 805 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 806 ("send station %s disassociate (reason %d)\n", 807 ether_sprintf(ni->ni_macaddr), arg)); 808 MGETHDR(m, M_DONTWAIT, MT_DATA); 809 if (m == NULL) 810 senderr(ENOMEM, is_tx_nombuf); 811 MH_ALIGN(m, 2); 812 m->m_pkthdr.len = m->m_len = 2; 813 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 814 break; 815 816 default: 817 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 818 ("%s: invalid mgmt frame type %u\n", __func__, type)); 819 senderr(EINVAL, is_tx_unknownmgt); 820 /* NOTREACHED */ 821 } 822 823 ret = ieee80211_mgmt_output(ifp, ni, m, type); 824 if (ret == 0) { 825 if (timer) 826 ic->ic_mgt_timer = timer; 827 } else { 828 bad: 829 ieee80211_release_node(ic, ni); 830 } 831 return ret; 832 #undef senderr 833 } 834 835 void 836 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 837 struct mbuf *m) 838 { 839 /* Store the new packet on our queue, changing the TIM if necessary */ 840 841 if (IF_IS_EMPTY(&ni->ni_savedq)) { 842 ic->ic_set_tim(ic, ni->ni_associd, 1); 843 } 844 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 845 IF_DROP(&ni->ni_savedq); 846 m_freem(m); 847 if (ic->ic_if.if_flags & IFF_DEBUG) 848 printf("%s: station %s power save queue overflow" 849 " of size %d drops %d\n", 850 ic->ic_if.if_xname, 851 ether_sprintf(ni->ni_macaddr), 852 IEEE80211_PS_MAX_QUEUE, 853 ni->ni_savedq.ifq_drops); 854 } else { 855 /* Similar to ieee80211_mgmt_output, store the node in 856 * the rcvif field. 857 */ 858 IF_ENQUEUE(&ni->ni_savedq, m); 859 m->m_pkthdr.rcvif = (void *)ni; 860 } 861 } 862 863
Indexes created Thu Sep 25 06:09:39 GMT 2025