ieee80211_output.c revision 1.22
1 /* $NetBSD: ieee80211_output.c,v 1.22 2004/12/27 05:35:33 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 1.22 2004/12/27 05:35:33 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 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, uint32_t flags, int rate, 297 struct ieee80211_duration *d) 298 { 299 int pre, ctsrate; 300 int 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 d->d_rts_dur = 348 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 349 pre + data_dur + 350 pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate; 351 352 d->d_data_dur = 353 pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / rate; 354 355 return 0; 356 } 357 358 /* 359 * Arguments in: 360 * 361 * wh: 802.11 header 362 * 363 * paylen: payload length (no FCS, no WEP header) 364 * 365 * rate: MSDU speed, units 500kb/s 366 * 367 * fraglen: fragment length, set to maximum (or higher) for no 368 * fragmentation 369 * 370 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 371 * IEEE80211_F_SHPREAMBLE (use short preamble), 372 * IEEE80211_F_SHSLOT (use short slot length) 373 * 374 * Arguments out: 375 * 376 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 377 * of first/only fragment 378 * 379 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 380 * of first/only fragment 381 */ 382 int 383 ieee80211_compute_duration(struct ieee80211_frame *wh, int len, 384 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 385 struct ieee80211_duration *dn, int *npktp, int debug) 386 { 387 int rc; 388 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 389 390 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 391 hdrlen = sizeof(struct ieee80211_frame_addr4); 392 else 393 hdrlen = sizeof(struct ieee80211_frame); 394 395 paylen = len - hdrlen; 396 397 if ((flags & IEEE80211_F_PRIVACY) != 0) { 398 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 399 #if 0 /* 802.11 lets us extend a fragment's length by the length of 400 * a WEP header, AFTER fragmentation. Might want to disable 401 * this while fancy link adaptations are running. 402 */ 403 fraglen -= IEEE80211_WEP_TOTLEN; 404 #endif 405 #if 0 /* Ditto CRC? */ 406 fraglen -= IEEE80211_CRC_LEN; 407 #endif 408 } else 409 overlen = IEEE80211_CRC_LEN; 410 411 npkt = paylen / fraglen; 412 lastlen0 = paylen % fraglen; 413 414 if (npkt == 0) { 415 /* no fragments */ 416 lastlen = paylen + overlen; 417 } else if (lastlen0 != 0) { 418 /* a short fragment */ 419 lastlen = lastlen0 + overlen; 420 npkt++; 421 } else 422 lastlen = fraglen + overlen; 423 424 if (npktp != NULL) 425 *npktp = npkt; 426 427 if (npkt > 1) 428 firstlen = fraglen + overlen; 429 else 430 firstlen = paylen + overlen; 431 432 if (debug) { 433 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 434 "fraglen %d overlen %d len %d rate %d flags %08x\n", 435 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 436 overlen, len, rate, flags); 437 } 438 rc = ieee80211_compute_duration1(firstlen + hdrlen, flags, rate, d0); 439 if (rc == -1) 440 return rc; 441 442 if (npkt <= 1) { 443 *dn = *d0; 444 return 0; 445 } 446 return ieee80211_compute_duration1(lastlen + hdrlen, flags, rate, dn); 447 } 448 449 /* 450 * Add a supported rates element id to a frame. 451 */ 452 u_int8_t * 453 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 454 { 455 int nrates; 456 457 *frm++ = IEEE80211_ELEMID_RATES; 458 nrates = rs->rs_nrates; 459 if (nrates > IEEE80211_RATE_SIZE) 460 nrates = IEEE80211_RATE_SIZE; 461 *frm++ = nrates; 462 memcpy(frm, rs->rs_rates, nrates); 463 return frm + nrates; 464 } 465 466 /* 467 * Add an extended supported rates element id to a frame. 468 */ 469 u_int8_t * 470 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 471 { 472 /* 473 * Add an extended supported rates element if operating in 11g mode. 474 */ 475 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 476 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 477 *frm++ = IEEE80211_ELEMID_XRATES; 478 *frm++ = nrates; 479 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 480 frm += nrates; 481 } 482 return frm; 483 } 484 485 /* 486 * Add an ssid elemet to a frame. 487 */ 488 static u_int8_t * 489 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 490 { 491 *frm++ = IEEE80211_ELEMID_SSID; 492 *frm++ = len; 493 memcpy(frm, ssid, len); 494 return frm + len; 495 } 496 497 static struct mbuf * 498 ieee80211_getmbuf(int flags, int type, u_int pktlen) 499 { 500 struct mbuf *m; 501 502 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 503 #ifdef __FreeBSD__ 504 if (pktlen <= MHLEN) 505 MGETHDR(m, flags, type); 506 else 507 m = m_getcl(flags, type, M_PKTHDR); 508 #else 509 MGETHDR(m, flags, type); 510 if (m != NULL && pktlen > MHLEN) 511 MCLGET(m, flags); 512 #endif 513 return m; 514 } 515 516 /* 517 * Send a management frame. The node is for the destination (or ic_bss 518 * when in station mode). Nodes other than ic_bss have their reference 519 * count bumped to reflect our use for an indeterminant time. 520 */ 521 int 522 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 523 int type, int arg) 524 { 525 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 526 struct ifnet *ifp = &ic->ic_if; 527 struct mbuf *m; 528 u_int8_t *frm; 529 enum ieee80211_phymode mode; 530 u_int16_t capinfo; 531 int has_challenge, is_shared_key, ret, timer; 532 533 IASSERT(ni != NULL, ("null node")); 534 535 /* 536 * Hold a reference on the node so it doesn't go away until after 537 * the xmit is complete all the way in the driver. On error we 538 * will remove our reference. 539 */ 540 ieee80211_ref_node(ni); 541 timer = 0; 542 switch (type) { 543 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 544 /* 545 * prreq frame format 546 * [tlv] ssid 547 * [tlv] supported rates 548 * [tlv] extended supported rates 549 */ 550 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 551 2 + ic->ic_des_esslen 552 + 2 + IEEE80211_RATE_SIZE 553 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 554 if (m == NULL) 555 senderr(ENOMEM, is_tx_nombuf); 556 m->m_data += sizeof(struct ieee80211_frame); 557 frm = mtod(m, u_int8_t *); 558 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 559 mode = ieee80211_chan2mode(ic, ni->ni_chan); 560 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 561 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 562 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 563 564 timer = IEEE80211_TRANS_WAIT; 565 break; 566 567 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 568 /* 569 * probe response frame format 570 * [8] time stamp 571 * [2] beacon interval 572 * [2] cabability information 573 * [tlv] ssid 574 * [tlv] supported rates 575 * [tlv] parameter set (FH/DS) 576 * [tlv] parameter set (IBSS) 577 * [tlv] extended supported rates 578 */ 579 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 580 8 + 2 + 2 + 2 581 + 2 + ni->ni_esslen 582 + 2 + IEEE80211_RATE_SIZE 583 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 584 + 6 585 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 586 if (m == NULL) 587 senderr(ENOMEM, is_tx_nombuf); 588 m->m_data += sizeof(struct ieee80211_frame); 589 frm = mtod(m, u_int8_t *); 590 591 memset(frm, 0, 8); /* timestamp should be filled later */ 592 frm += 8; 593 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 594 frm += 2; 595 if (ic->ic_opmode == IEEE80211_M_IBSS) 596 capinfo = IEEE80211_CAPINFO_IBSS; 597 else 598 capinfo = IEEE80211_CAPINFO_ESS; 599 if (ic->ic_flags & IEEE80211_F_PRIVACY) 600 capinfo |= IEEE80211_CAPINFO_PRIVACY; 601 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 602 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 603 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 604 *(u_int16_t *)frm = htole16(capinfo); 605 frm += 2; 606 607 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 608 ic->ic_bss->ni_esslen); 609 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 610 611 if (ic->ic_phytype == IEEE80211_T_FH) { 612 *frm++ = IEEE80211_ELEMID_FHPARMS; 613 *frm++ = 5; 614 *frm++ = ni->ni_fhdwell & 0x00ff; 615 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 616 *frm++ = IEEE80211_FH_CHANSET( 617 ieee80211_chan2ieee(ic, ni->ni_chan)); 618 *frm++ = IEEE80211_FH_CHANPAT( 619 ieee80211_chan2ieee(ic, ni->ni_chan)); 620 *frm++ = ni->ni_fhindex; 621 } else { 622 *frm++ = IEEE80211_ELEMID_DSPARMS; 623 *frm++ = 1; 624 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 625 } 626 627 if (ic->ic_opmode == IEEE80211_M_IBSS) { 628 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 629 *frm++ = 2; 630 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 631 } else { /* IEEE80211_M_HOSTAP */ 632 /* TODO: TIM */ 633 *frm++ = IEEE80211_ELEMID_TIM; 634 *frm++ = 4; /* length */ 635 *frm++ = 0; /* DTIM count */ 636 *frm++ = 1; /* DTIM period */ 637 *frm++ = 0; /* bitmap control */ 638 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 639 } 640 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 641 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 642 break; 643 644 case IEEE80211_FC0_SUBTYPE_AUTH: 645 MGETHDR(m, M_DONTWAIT, MT_DATA); 646 if (m == NULL) 647 senderr(ENOMEM, is_tx_nombuf); 648 649 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 650 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 651 ni->ni_challenge != NULL); 652 653 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 654 arg == IEEE80211_AUTH_SHARED_PASS); 655 656 if (has_challenge) { 657 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 658 m->m_pkthdr.len = m->m_len = 659 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 660 } else { 661 MH_ALIGN(m, 2 * 3); 662 m->m_pkthdr.len = m->m_len = 2 * 3; 663 } 664 frm = mtod(m, u_int8_t *); 665 ((u_int16_t *)frm)[0] = 666 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 667 : htole16(IEEE80211_AUTH_ALG_OPEN); 668 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 669 ((u_int16_t *)frm)[2] = 0; /* status */ 670 671 if (has_challenge) { 672 ((u_int16_t *)frm)[3] = 673 htole16((IEEE80211_CHALLENGE_LEN << 8) | 674 IEEE80211_ELEMID_CHALLENGE); 675 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 676 IEEE80211_CHALLENGE_LEN); 677 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 678 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 679 ("%s: request encrypt frame\n", __func__)); 680 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 681 } 682 } 683 if (ic->ic_opmode == IEEE80211_M_STA) 684 timer = IEEE80211_TRANS_WAIT; 685 break; 686 687 case IEEE80211_FC0_SUBTYPE_DEAUTH: 688 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 689 ("send station %s deauthenticate (reason %d)\n", 690 ether_sprintf(ni->ni_macaddr), arg)); 691 MGETHDR(m, M_DONTWAIT, MT_DATA); 692 if (m == NULL) 693 senderr(ENOMEM, is_tx_nombuf); 694 MH_ALIGN(m, 2); 695 m->m_pkthdr.len = m->m_len = 2; 696 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 697 break; 698 699 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 700 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 701 /* 702 * asreq frame format 703 * [2] capability information 704 * [2] listen interval 705 * [6*] current AP address (reassoc only) 706 * [tlv] ssid 707 * [tlv] supported rates 708 * [tlv] extended supported rates 709 */ 710 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 711 sizeof(capinfo) 712 + sizeof(u_int16_t) 713 + IEEE80211_ADDR_LEN 714 + 2 + ni->ni_esslen 715 + 2 + IEEE80211_RATE_SIZE 716 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 717 if (m == NULL) 718 senderr(ENOMEM, is_tx_nombuf); 719 m->m_data += sizeof(struct ieee80211_frame); 720 frm = mtod(m, u_int8_t *); 721 722 capinfo = 0; 723 if (ic->ic_opmode == IEEE80211_M_IBSS) 724 capinfo |= IEEE80211_CAPINFO_IBSS; 725 else /* IEEE80211_M_STA */ 726 capinfo |= IEEE80211_CAPINFO_ESS; 727 if (ic->ic_flags & IEEE80211_F_PRIVACY) 728 capinfo |= IEEE80211_CAPINFO_PRIVACY; 729 /* 730 * NB: Some 11a AP's reject the request when 731 * short premable is set. 732 */ 733 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 734 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 735 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 736 if (ic->ic_flags & IEEE80211_F_SHSLOT) 737 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 738 *(u_int16_t *)frm = htole16(capinfo); 739 frm += 2; 740 741 *(u_int16_t *)frm = htole16(ic->ic_lintval); 742 frm += 2; 743 744 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 745 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 746 frm += IEEE80211_ADDR_LEN; 747 } 748 749 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 750 frm = ieee80211_add_rates(frm, &ni->ni_rates); 751 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 752 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 753 754 timer = IEEE80211_TRANS_WAIT; 755 break; 756 757 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 758 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 759 /* 760 * asreq frame format 761 * [2] capability information 762 * [2] status 763 * [2] association ID 764 * [tlv] supported rates 765 * [tlv] extended supported rates 766 */ 767 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 768 sizeof(capinfo) 769 + sizeof(u_int16_t) 770 + sizeof(u_int16_t) 771 + 2 + IEEE80211_RATE_SIZE 772 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 773 if (m == NULL) 774 senderr(ENOMEM, is_tx_nombuf); 775 m->m_data += sizeof(struct ieee80211_frame); 776 frm = mtod(m, u_int8_t *); 777 778 capinfo = IEEE80211_CAPINFO_ESS; 779 if (ic->ic_flags & IEEE80211_F_PRIVACY) 780 capinfo |= IEEE80211_CAPINFO_PRIVACY; 781 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 782 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 783 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 784 *(u_int16_t *)frm = htole16(capinfo); 785 frm += 2; 786 787 *(u_int16_t *)frm = htole16(arg); /* status */ 788 frm += 2; 789 790 if (arg == IEEE80211_STATUS_SUCCESS) 791 *(u_int16_t *)frm = htole16(ni->ni_associd); 792 frm += 2; 793 794 frm = ieee80211_add_rates(frm, &ni->ni_rates); 795 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 796 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 797 break; 798 799 case IEEE80211_FC0_SUBTYPE_DISASSOC: 800 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 801 ("send station %s disassociate (reason %d)\n", 802 ether_sprintf(ni->ni_macaddr), arg)); 803 MGETHDR(m, M_DONTWAIT, MT_DATA); 804 if (m == NULL) 805 senderr(ENOMEM, is_tx_nombuf); 806 MH_ALIGN(m, 2); 807 m->m_pkthdr.len = m->m_len = 2; 808 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 809 break; 810 811 default: 812 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 813 ("%s: invalid mgmt frame type %u\n", __func__, type)); 814 senderr(EINVAL, is_tx_unknownmgt); 815 /* NOTREACHED */ 816 } 817 818 ret = ieee80211_mgmt_output(ifp, ni, m, type); 819 if (ret == 0) { 820 if (timer) 821 ic->ic_mgt_timer = timer; 822 } else { 823 bad: 824 ieee80211_release_node(ic, ni); 825 } 826 return ret; 827 #undef senderr 828 } 829 830 void 831 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 832 struct mbuf *m) 833 { 834 /* Store the new packet on our queue, changing the TIM if necessary */ 835 836 if (IF_IS_EMPTY(&ni->ni_savedq)) { 837 ic->ic_set_tim(ic, ni->ni_associd, 1); 838 } 839 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 840 IF_DROP(&ni->ni_savedq); 841 m_freem(m); 842 if (ic->ic_if.if_flags & IFF_DEBUG) 843 printf("%s: station %s power save queue overflow" 844 " of size %d drops %d\n", 845 ic->ic_if.if_xname, 846 ether_sprintf(ni->ni_macaddr), 847 IEEE80211_PS_MAX_QUEUE, 848 ni->ni_savedq.ifq_drops); 849 } else { 850 /* Similar to ieee80211_mgmt_output, store the node in 851 * the rcvif field. 852 */ 853 IF_ENQUEUE(&ni->ni_savedq, m); 854 m->m_pkthdr.rcvif = (void *)ni; 855 } 856 } 857 858
Indexes created Fri Sep 26 08:10:20 GMT 2025