ieee80211_output.c revision 1.15
1 /* $NetBSD: ieee80211_output.c,v 1.15 2004/07/23 08:25:25 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 1.15 2004/07/23 08:25:25 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_WEPON) 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 && ni != ic->ic_bss) 271 ieee80211_free_node(ic, ni); 272 *pni = NULL; 273 return NULL; 274 } 275 276 /* 277 * Add a supported rates element id to a frame. 278 */ 279 u_int8_t * 280 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 281 { 282 int nrates; 283 284 *frm++ = IEEE80211_ELEMID_RATES; 285 nrates = rs->rs_nrates; 286 if (nrates > IEEE80211_RATE_SIZE) 287 nrates = IEEE80211_RATE_SIZE; 288 *frm++ = nrates; 289 memcpy(frm, rs->rs_rates, nrates); 290 return frm + nrates; 291 } 292 293 /* 294 * Add an extended supported rates element id to a frame. 295 */ 296 u_int8_t * 297 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 298 { 299 /* 300 * Add an extended supported rates element if operating in 11g mode. 301 */ 302 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 303 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 304 *frm++ = IEEE80211_ELEMID_XRATES; 305 *frm++ = nrates; 306 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 307 frm += nrates; 308 } 309 return frm; 310 } 311 312 /* 313 * Add an ssid elemet to a frame. 314 */ 315 static u_int8_t * 316 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 317 { 318 *frm++ = IEEE80211_ELEMID_SSID; 319 *frm++ = len; 320 memcpy(frm, ssid, len); 321 return frm + len; 322 } 323 324 static struct mbuf * 325 ieee80211_getmbuf(int flags, int type, u_int pktlen) 326 { 327 struct mbuf *m; 328 329 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 330 #ifdef __FreeBSD__ 331 if (pktlen <= MHLEN) 332 MGETHDR(m, flags, type); 333 else 334 m = m_getcl(flags, type, M_PKTHDR); 335 #else 336 MGETHDR(m, flags, type); 337 if (m != NULL && pktlen > MHLEN) 338 MCLGET(m, flags); 339 #endif 340 return m; 341 } 342 343 /* 344 * Send a management frame. The node is for the destination (or ic_bss 345 * when in station mode). Nodes other than ic_bss have their reference 346 * count bumped to reflect our use for an indeterminant time. 347 */ 348 int 349 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 350 int type, int arg) 351 { 352 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 353 struct ifnet *ifp = &ic->ic_if; 354 struct mbuf *m; 355 u_int8_t *frm; 356 enum ieee80211_phymode mode; 357 u_int16_t capinfo; 358 int has_challenge, is_shared_key, ret, timer; 359 360 IASSERT(ni != NULL, ("null node")); 361 362 /* 363 * Hold a reference on the node so it doesn't go away until after 364 * the xmit is complete all the way in the driver. On error we 365 * will remove our reference. 366 */ 367 if (ni != ic->ic_bss) 368 ieee80211_ref_node(ni); 369 timer = 0; 370 switch (type) { 371 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 372 /* 373 * prreq frame format 374 * [tlv] ssid 375 * [tlv] supported rates 376 * [tlv] extended supported rates 377 */ 378 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 379 2 + ic->ic_des_esslen 380 + 2 + IEEE80211_RATE_SIZE 381 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 382 if (m == NULL) 383 senderr(ENOMEM, is_tx_nombuf); 384 m->m_data += sizeof(struct ieee80211_frame); 385 frm = mtod(m, u_int8_t *); 386 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 387 mode = ieee80211_chan2mode(ic, ni->ni_chan); 388 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 389 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 390 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 391 392 timer = IEEE80211_TRANS_WAIT; 393 break; 394 395 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 396 /* 397 * probe response frame format 398 * [8] time stamp 399 * [2] beacon interval 400 * [2] cabability information 401 * [tlv] ssid 402 * [tlv] supported rates 403 * [tlv] parameter set (FH/DS) 404 * [tlv] parameter set (IBSS) 405 * [tlv] extended supported rates 406 */ 407 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 408 8 + 2 + 2 + 2 409 + 2 + ni->ni_esslen 410 + 2 + IEEE80211_RATE_SIZE 411 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 412 + 6 413 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 414 if (m == NULL) 415 senderr(ENOMEM, is_tx_nombuf); 416 m->m_data += sizeof(struct ieee80211_frame); 417 frm = mtod(m, u_int8_t *); 418 419 memset(frm, 0, 8); /* timestamp should be filled later */ 420 frm += 8; 421 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 422 frm += 2; 423 if (ic->ic_opmode == IEEE80211_M_IBSS) 424 capinfo = IEEE80211_CAPINFO_IBSS; 425 else 426 capinfo = IEEE80211_CAPINFO_ESS; 427 if (ic->ic_flags & IEEE80211_F_WEPON) 428 capinfo |= IEEE80211_CAPINFO_PRIVACY; 429 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 430 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 431 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 432 *(u_int16_t *)frm = htole16(capinfo); 433 frm += 2; 434 435 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 436 ic->ic_bss->ni_esslen); 437 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 438 439 if (ic->ic_phytype == IEEE80211_T_FH) { 440 *frm++ = IEEE80211_ELEMID_FHPARMS; 441 *frm++ = 5; 442 *frm++ = ni->ni_fhdwell & 0x00ff; 443 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 444 *frm++ = IEEE80211_FH_CHANSET( 445 ieee80211_chan2ieee(ic, ni->ni_chan)); 446 *frm++ = IEEE80211_FH_CHANPAT( 447 ieee80211_chan2ieee(ic, ni->ni_chan)); 448 *frm++ = ni->ni_fhindex; 449 } else { 450 *frm++ = IEEE80211_ELEMID_DSPARMS; 451 *frm++ = 1; 452 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 453 } 454 455 if (ic->ic_opmode == IEEE80211_M_IBSS) { 456 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 457 *frm++ = 2; 458 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 459 } else { /* IEEE80211_M_HOSTAP */ 460 /* TODO: TIM */ 461 *frm++ = IEEE80211_ELEMID_TIM; 462 *frm++ = 4; /* length */ 463 *frm++ = 0; /* DTIM count */ 464 *frm++ = 1; /* DTIM period */ 465 *frm++ = 0; /* bitmap control */ 466 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 467 } 468 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 469 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 470 break; 471 472 case IEEE80211_FC0_SUBTYPE_AUTH: 473 MGETHDR(m, M_DONTWAIT, MT_DATA); 474 if (m == NULL) 475 senderr(ENOMEM, is_tx_nombuf); 476 477 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 478 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 479 ni->ni_challenge != NULL); 480 481 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 482 arg == IEEE80211_AUTH_SHARED_PASS); 483 484 if (has_challenge) { 485 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 486 m->m_pkthdr.len = m->m_len = 487 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 488 } else { 489 MH_ALIGN(m, 2 * 3); 490 m->m_pkthdr.len = m->m_len = 2 * 3; 491 } 492 frm = mtod(m, u_int8_t *); 493 ((u_int16_t *)frm)[0] = 494 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 495 : htole16(IEEE80211_AUTH_ALG_OPEN); 496 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 497 ((u_int16_t *)frm)[2] = 0; /* status */ 498 499 if (has_challenge) { 500 ((u_int16_t *)frm)[3] = 501 htole16((IEEE80211_CHALLENGE_LEN << 8) | 502 IEEE80211_ELEMID_CHALLENGE); 503 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 504 IEEE80211_CHALLENGE_LEN); 505 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 506 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 507 ("%s: request encrypt frame\n", __func__)); 508 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 509 } 510 } 511 if (ic->ic_opmode == IEEE80211_M_STA) 512 timer = IEEE80211_TRANS_WAIT; 513 break; 514 515 case IEEE80211_FC0_SUBTYPE_DEAUTH: 516 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 517 ("send station %s deauthenticate (reason %d)\n", 518 ether_sprintf(ni->ni_macaddr), arg)); 519 MGETHDR(m, M_DONTWAIT, MT_DATA); 520 if (m == NULL) 521 senderr(ENOMEM, is_tx_nombuf); 522 MH_ALIGN(m, 2); 523 m->m_pkthdr.len = m->m_len = 2; 524 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 525 break; 526 527 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 528 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 529 /* 530 * asreq frame format 531 * [2] capability information 532 * [2] listen interval 533 * [6*] current AP address (reassoc only) 534 * [tlv] ssid 535 * [tlv] supported rates 536 * [tlv] extended supported rates 537 */ 538 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 539 sizeof(capinfo) 540 + sizeof(u_int16_t) 541 + IEEE80211_ADDR_LEN 542 + 2 + ni->ni_esslen 543 + 2 + IEEE80211_RATE_SIZE 544 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 545 if (m == NULL) 546 senderr(ENOMEM, is_tx_nombuf); 547 m->m_data += sizeof(struct ieee80211_frame); 548 frm = mtod(m, u_int8_t *); 549 550 capinfo = 0; 551 if (ic->ic_opmode == IEEE80211_M_IBSS) 552 capinfo |= IEEE80211_CAPINFO_IBSS; 553 else /* IEEE80211_M_STA */ 554 capinfo |= IEEE80211_CAPINFO_ESS; 555 if (ic->ic_flags & IEEE80211_F_WEPON) 556 capinfo |= IEEE80211_CAPINFO_PRIVACY; 557 /* 558 * NB: Some 11a AP's reject the request when 559 * short premable is set. 560 */ 561 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 562 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 563 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 564 if (ic->ic_flags & IEEE80211_F_SHSLOT) 565 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 566 *(u_int16_t *)frm = htole16(capinfo); 567 frm += 2; 568 569 *(u_int16_t *)frm = htole16(ic->ic_lintval); 570 frm += 2; 571 572 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 573 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 574 frm += IEEE80211_ADDR_LEN; 575 } 576 577 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 578 frm = ieee80211_add_rates(frm, &ni->ni_rates); 579 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 580 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 581 582 timer = IEEE80211_TRANS_WAIT; 583 break; 584 585 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 586 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 587 /* 588 * asreq frame format 589 * [2] capability information 590 * [2] status 591 * [2] association ID 592 * [tlv] supported rates 593 * [tlv] extended supported rates 594 */ 595 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 596 sizeof(capinfo) 597 + sizeof(u_int16_t) 598 + sizeof(u_int16_t) 599 + 2 + IEEE80211_RATE_SIZE 600 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 601 if (m == NULL) 602 senderr(ENOMEM, is_tx_nombuf); 603 m->m_data += sizeof(struct ieee80211_frame); 604 frm = mtod(m, u_int8_t *); 605 606 capinfo = IEEE80211_CAPINFO_ESS; 607 if (ic->ic_flags & IEEE80211_F_WEPON) 608 capinfo |= IEEE80211_CAPINFO_PRIVACY; 609 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 610 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 611 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 612 *(u_int16_t *)frm = htole16(capinfo); 613 frm += 2; 614 615 *(u_int16_t *)frm = htole16(arg); /* status */ 616 frm += 2; 617 618 if (arg == IEEE80211_STATUS_SUCCESS) 619 *(u_int16_t *)frm = htole16(ni->ni_associd); 620 frm += 2; 621 622 frm = ieee80211_add_rates(frm, &ni->ni_rates); 623 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 624 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 625 break; 626 627 case IEEE80211_FC0_SUBTYPE_DISASSOC: 628 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 629 ("send station %s disassociate (reason %d)\n", 630 ether_sprintf(ni->ni_macaddr), arg)); 631 MGETHDR(m, M_DONTWAIT, MT_DATA); 632 if (m == NULL) 633 senderr(ENOMEM, is_tx_nombuf); 634 MH_ALIGN(m, 2); 635 m->m_pkthdr.len = m->m_len = 2; 636 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 637 break; 638 639 default: 640 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 641 ("%s: invalid mgmt frame type %u\n", __func__, type)); 642 senderr(EINVAL, is_tx_unknownmgt); 643 /* NOTREACHED */ 644 } 645 646 ret = ieee80211_mgmt_output(ifp, ni, m, type); 647 if (ret == 0) { 648 if (timer) 649 ic->ic_mgt_timer = timer; 650 } else { 651 bad: 652 if (ni != ic->ic_bss) /* remove ref we added */ 653 ieee80211_free_node(ic, ni); 654 } 655 return ret; 656 #undef senderr 657 } 658 659 void 660 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 661 struct mbuf *m) 662 { 663 /* Store the new packet on our queue, changing the TIM if necessary */ 664 665 if (IF_IS_EMPTY(&ni->ni_savedq)) { 666 ic->ic_set_tim(ic, ni->ni_associd, 1); 667 } 668 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 669 IF_DROP(&ni->ni_savedq); 670 m_freem(m); 671 if (ic->ic_if.if_flags & IFF_DEBUG) 672 printf("%s: station %s power save queue overflow" 673 " of size %d drops %d\n", 674 ic->ic_if.if_xname, 675 ether_sprintf(ni->ni_macaddr), 676 IEEE80211_PS_MAX_QUEUE, 677 ni->ni_savedq.ifq_drops); 678 } else { 679 /* Similar to ieee80211_mgmt_output, store the node in 680 * the rcvif field. 681 */ 682 IF_ENQUEUE(&ni->ni_savedq, m); 683 m->m_pkthdr.rcvif = (void *)ni; 684 } 685 } 686 687
Indexes created Tue Sep 23 02:09:52 GMT 2025