ieee80211_output.c revision 1.12
1 /* $NetBSD: ieee80211_output.c,v 1.12 2004/04/30 23:58:17 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 1.12 2004/04/30 23:58:17 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 /* 94 * Send a management frame to the specified node. The node pointer 95 * must have a reference as the pointer will be passed to the driver 96 * and potentially held for a long time. If the frame is successfully 97 * dispatched to the driver, then it is responsible for freeing the 98 * reference (and potentially free'ing up any associated storage). 99 */ 100 static int 101 ieee80211_mgmt_output(struct ifnet *ifp, struct ieee80211_node *ni, 102 struct mbuf *m, int type) 103 { 104 struct ieee80211com *ic = (void *)ifp; 105 struct ieee80211_frame *wh; 106 107 IASSERT(ni != NULL, ("null node")); 108 ni->ni_inact = 0; 109 110 /* 111 * Yech, hack alert! We want to pass the node down to the 112 * driver's start routine. If we don't do so then the start 113 * routine must immediately look it up again and that can 114 * cause a lock order reversal if, for example, this frame 115 * is being sent because the station is being timedout and 116 * the frame being sent is a DEAUTH message. We could stick 117 * this in an m_tag and tack that on to the mbuf. However 118 * that's rather expensive to do for every frame so instead 119 * we stuff it in the rcvif field since outbound frames do 120 * not (presently) use this. 121 */ 122 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 123 if (m == NULL) 124 return ENOMEM; 125 #ifdef __FreeBSD__ 126 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 127 #endif 128 m->m_pkthdr.rcvif = (void *)ni; 129 130 wh = mtod(m, struct ieee80211_frame *); 131 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type; 132 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 133 *(u_int16_t *)&wh->i_dur[0] = 0; 134 *(u_int16_t *)&wh->i_seq[0] = 135 htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT); 136 ni->ni_txseq++; 137 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 138 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 139 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 140 141 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 142 m->m_flags &= ~M_LINK0; 143 IEEE80211_DPRINTF(("%s: encrypting frame for %s\n", __func__, 144 ether_sprintf(wh->i_addr1))); 145 wh->i_fc[1] |= IEEE80211_FC1_WEP; 146 } 147 148 if (ifp->if_flags & IFF_DEBUG) { 149 /* avoid to print too many frames */ 150 if (ic->ic_opmode == IEEE80211_M_IBSS || 151 #ifdef IEEE80211_DEBUG 152 ieee80211_debug > 1 || 153 #endif 154 (type & IEEE80211_FC0_SUBTYPE_MASK) != 155 IEEE80211_FC0_SUBTYPE_PROBE_RESP) 156 if_printf(ifp, "sending %s to %s on channel %u\n", 157 ieee80211_mgt_subtype_name[ 158 (type & IEEE80211_FC0_SUBTYPE_MASK) 159 >> IEEE80211_FC0_SUBTYPE_SHIFT], 160 ether_sprintf(ni->ni_macaddr), 161 ieee80211_chan2ieee(ic, ni->ni_chan)); 162 } 163 164 IF_ENQUEUE(&ic->ic_mgtq, m); 165 ifp->if_timer = 1; 166 (*ifp->if_start)(ifp); 167 return 0; 168 } 169 170 /* 171 * Encapsulate an outbound data frame. The mbuf chain is updated and 172 * a reference to the destination node is returned. If an error is 173 * encountered NULL is returned and the node reference will also be NULL. 174 * 175 * NB: The caller is responsible for free'ing a returned node reference. 176 * The convention is ic_bss is not reference counted; the caller must 177 * maintain that. 178 */ 179 struct mbuf * 180 ieee80211_encap(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node **pni) 181 { 182 struct ieee80211com *ic = (void *)ifp; 183 struct ether_header eh; 184 struct ieee80211_frame *wh; 185 struct ieee80211_node *ni = NULL; 186 struct llc *llc; 187 188 if (m->m_len < sizeof(struct ether_header)) { 189 m = m_pullup(m, sizeof(struct ether_header)); 190 if (m == NULL) { 191 ic->ic_stats.is_tx_nombuf++; 192 goto bad; 193 } 194 } 195 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 196 197 ni = ieee80211_find_txnode(ic, eh.ether_dhost); 198 if (ni == NULL) { 199 IEEE80211_DPRINTF(("%s: no node for dst %s, discard frame\n", 200 __func__, ether_sprintf(eh.ether_dhost))); 201 ic->ic_stats.is_tx_nonode++; 202 goto bad; 203 } 204 ni->ni_inact = 0; 205 206 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 207 llc = mtod(m, struct llc *); 208 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 209 llc->llc_control = LLC_UI; 210 llc->llc_snap.org_code[0] = 0; 211 llc->llc_snap.org_code[1] = 0; 212 llc->llc_snap.org_code[2] = 0; 213 llc->llc_snap.ether_type = eh.ether_type; 214 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 215 if (m == NULL) { 216 ic->ic_stats.is_tx_nombuf++; 217 goto bad; 218 } 219 wh = mtod(m, struct ieee80211_frame *); 220 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 221 *(u_int16_t *)&wh->i_dur[0] = 0; 222 *(u_int16_t *)&wh->i_seq[0] = 223 htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT); 224 ni->ni_txseq++; 225 switch (ic->ic_opmode) { 226 case IEEE80211_M_STA: 227 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 228 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 229 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 230 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 231 break; 232 case IEEE80211_M_IBSS: 233 case IEEE80211_M_AHDEMO: 234 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 235 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 236 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 237 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 238 break; 239 case IEEE80211_M_HOSTAP: 240 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 241 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 242 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 243 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 244 break; 245 case IEEE80211_M_MONITOR: 246 goto bad; 247 } 248 *pni = ni; 249 return m; 250 bad: 251 if (m != NULL) 252 m_freem(m); 253 if (ni && ni != ic->ic_bss) 254 ieee80211_free_node(ic, ni); 255 *pni = NULL; 256 return NULL; 257 } 258 259 /* 260 * Add a supported rates element id to a frame. 261 */ 262 u_int8_t * 263 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 264 { 265 int nrates; 266 267 *frm++ = IEEE80211_ELEMID_RATES; 268 nrates = rs->rs_nrates; 269 if (nrates > IEEE80211_RATE_SIZE) 270 nrates = IEEE80211_RATE_SIZE; 271 *frm++ = nrates; 272 memcpy(frm, rs->rs_rates, nrates); 273 return frm + nrates; 274 } 275 276 /* 277 * Add an extended supported rates element id to a frame. 278 */ 279 u_int8_t * 280 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 281 { 282 /* 283 * Add an extended supported rates element if operating in 11g mode. 284 */ 285 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 286 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 287 *frm++ = IEEE80211_ELEMID_XRATES; 288 *frm++ = nrates; 289 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 290 frm += nrates; 291 } 292 return frm; 293 } 294 295 /* 296 * Add an ssid elemet to a frame. 297 */ 298 static u_int8_t * 299 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 300 { 301 *frm++ = IEEE80211_ELEMID_SSID; 302 *frm++ = len; 303 memcpy(frm, ssid, len); 304 return frm + len; 305 } 306 307 static struct mbuf * 308 ieee80211_getmbuf(int flags, int type, u_int pktlen) 309 { 310 struct mbuf *m; 311 312 IASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 313 #ifdef __FreeBSD__ 314 if (pktlen <= MHLEN) 315 MGETHDR(m, flags, type); 316 else 317 m = m_getcl(flags, type, M_PKTHDR); 318 #else 319 MGETHDR(m, flags, type); 320 if (m != NULL && pktlen > MHLEN) 321 MCLGET(m, flags); 322 #endif 323 return m; 324 } 325 326 /* 327 * Send a management frame. The node is for the destination (or ic_bss 328 * when in station mode). Nodes other than ic_bss have their reference 329 * count bumped to reflect our use for an indeterminant time. 330 */ 331 int 332 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 333 int type, int arg) 334 { 335 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 336 struct ifnet *ifp = &ic->ic_if; 337 struct mbuf *m; 338 u_int8_t *frm; 339 enum ieee80211_phymode mode; 340 u_int16_t capinfo; 341 int has_challenge, is_shared_key, ret, timer; 342 343 IASSERT(ni != NULL, ("null node")); 344 345 /* 346 * Hold a reference on the node so it doesn't go away until after 347 * the xmit is complete all the way in the driver. On error we 348 * will remove our reference. 349 */ 350 if (ni != ic->ic_bss) 351 ieee80211_ref_node(ni); 352 timer = 0; 353 switch (type) { 354 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 355 /* 356 * prreq frame format 357 * [tlv] ssid 358 * [tlv] supported rates 359 * [tlv] extended supported rates 360 */ 361 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 362 2 + ic->ic_des_esslen 363 + 2 + IEEE80211_RATE_SIZE 364 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 365 if (m == NULL) 366 senderr(ENOMEM, is_tx_nombuf); 367 m->m_data += sizeof(struct ieee80211_frame); 368 frm = mtod(m, u_int8_t *); 369 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 370 mode = ieee80211_chan2mode(ic, ni->ni_chan); 371 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 372 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 373 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 374 375 timer = IEEE80211_TRANS_WAIT; 376 break; 377 378 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 379 /* 380 * probe response frame format 381 * [8] time stamp 382 * [2] beacon interval 383 * [2] cabability information 384 * [tlv] ssid 385 * [tlv] supported rates 386 * [tlv] parameter set (FH/DS) 387 * [tlv] parameter set (IBSS) 388 * [tlv] extended supported rates 389 */ 390 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 391 8 + 2 + 2 + 2 392 + 2 + ni->ni_esslen 393 + 2 + IEEE80211_RATE_SIZE 394 + (ic->ic_phytype == IEEE80211_T_FH ? 7 : 3) 395 + 6 396 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 397 if (m == NULL) 398 senderr(ENOMEM, is_tx_nombuf); 399 m->m_data += sizeof(struct ieee80211_frame); 400 frm = mtod(m, u_int8_t *); 401 402 memset(frm, 0, 8); /* timestamp should be filled later */ 403 frm += 8; 404 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 405 frm += 2; 406 if (ic->ic_opmode == IEEE80211_M_IBSS) 407 capinfo = IEEE80211_CAPINFO_IBSS; 408 else 409 capinfo = IEEE80211_CAPINFO_ESS; 410 if (ic->ic_flags & IEEE80211_F_WEPON) 411 capinfo |= IEEE80211_CAPINFO_PRIVACY; 412 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 413 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 414 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 415 *(u_int16_t *)frm = htole16(capinfo); 416 frm += 2; 417 418 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 419 ic->ic_bss->ni_esslen); 420 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 421 422 if (ic->ic_phytype == IEEE80211_T_FH) { 423 *frm++ = IEEE80211_ELEMID_FHPARMS; 424 *frm++ = 5; 425 *frm++ = ni->ni_fhdwell & 0x00ff; 426 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 427 *frm++ = IEEE80211_FH_CHANSET( 428 ieee80211_chan2ieee(ic, ni->ni_chan)); 429 *frm++ = IEEE80211_FH_CHANPAT( 430 ieee80211_chan2ieee(ic, ni->ni_chan)); 431 *frm++ = ni->ni_fhindex; 432 } else { 433 *frm++ = IEEE80211_ELEMID_DSPARMS; 434 *frm++ = 1; 435 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 436 } 437 438 if (ic->ic_opmode == IEEE80211_M_IBSS) { 439 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 440 *frm++ = 2; 441 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 442 } else { /* IEEE80211_M_HOSTAP */ 443 /* TODO: TIM */ 444 *frm++ = IEEE80211_ELEMID_TIM; 445 *frm++ = 4; /* length */ 446 *frm++ = 0; /* DTIM count */ 447 *frm++ = 1; /* DTIM period */ 448 *frm++ = 0; /* bitmap control */ 449 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 450 } 451 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 452 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 453 break; 454 455 case IEEE80211_FC0_SUBTYPE_AUTH: 456 MGETHDR(m, M_DONTWAIT, MT_DATA); 457 if (m == NULL) 458 senderr(ENOMEM, is_tx_nombuf); 459 460 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 461 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 462 ni->ni_challenge != NULL); 463 464 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 465 arg == IEEE80211_AUTH_SHARED_PASS); 466 467 if (has_challenge) { 468 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 469 m->m_pkthdr.len = m->m_len = 470 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 471 } else { 472 MH_ALIGN(m, 2 * 3); 473 m->m_pkthdr.len = m->m_len = 2 * 3; 474 } 475 frm = mtod(m, u_int8_t *); 476 ((u_int16_t *)frm)[0] = 477 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 478 : htole16(IEEE80211_AUTH_ALG_OPEN); 479 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 480 ((u_int16_t *)frm)[2] = 0; /* status */ 481 482 if (has_challenge) { 483 ((u_int16_t *)frm)[3] = 484 htole16((IEEE80211_CHALLENGE_LEN << 8) | 485 IEEE80211_ELEMID_CHALLENGE); 486 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 487 IEEE80211_CHALLENGE_LEN); 488 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 489 IEEE80211_DPRINTF(( 490 "%s: request encrypt frame\n", __func__)); 491 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 492 } 493 } 494 if (ic->ic_opmode == IEEE80211_M_STA) 495 timer = IEEE80211_TRANS_WAIT; 496 break; 497 498 case IEEE80211_FC0_SUBTYPE_DEAUTH: 499 if (ifp->if_flags & IFF_DEBUG) 500 if_printf(ifp, "station %s deauthenticate (reason %d)\n", 501 ether_sprintf(ni->ni_macaddr), arg); 502 MGETHDR(m, M_DONTWAIT, MT_DATA); 503 if (m == NULL) 504 senderr(ENOMEM, is_tx_nombuf); 505 MH_ALIGN(m, 2); 506 m->m_pkthdr.len = m->m_len = 2; 507 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 508 break; 509 510 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 511 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 512 /* 513 * asreq frame format 514 * [2] capability information 515 * [2] listen interval 516 * [6*] current AP address (reassoc only) 517 * [tlv] ssid 518 * [tlv] supported rates 519 * [tlv] extended supported rates 520 */ 521 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 522 sizeof(capinfo) 523 + sizeof(u_int16_t) 524 + IEEE80211_ADDR_LEN 525 + 2 + ni->ni_esslen 526 + 2 + IEEE80211_RATE_SIZE 527 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 528 if (m == NULL) 529 senderr(ENOMEM, is_tx_nombuf); 530 m->m_data += sizeof(struct ieee80211_frame); 531 frm = mtod(m, u_int8_t *); 532 533 capinfo = 0; 534 if (ic->ic_opmode == IEEE80211_M_IBSS) 535 capinfo |= IEEE80211_CAPINFO_IBSS; 536 else /* IEEE80211_M_STA */ 537 capinfo |= IEEE80211_CAPINFO_ESS; 538 if (ic->ic_flags & IEEE80211_F_WEPON) 539 capinfo |= IEEE80211_CAPINFO_PRIVACY; 540 /* 541 * NB: Some 11a AP's reject the request when 542 * short premable is set. 543 */ 544 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 545 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 546 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 547 if (ic->ic_flags & IEEE80211_F_SHSLOT) 548 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 549 *(u_int16_t *)frm = htole16(capinfo); 550 frm += 2; 551 552 *(u_int16_t *)frm = htole16(ic->ic_lintval); 553 frm += 2; 554 555 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 556 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 557 frm += IEEE80211_ADDR_LEN; 558 } 559 560 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 561 frm = ieee80211_add_rates(frm, &ni->ni_rates); 562 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 563 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 564 565 timer = IEEE80211_TRANS_WAIT; 566 break; 567 568 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 569 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 570 /* 571 * asreq frame format 572 * [2] capability information 573 * [2] status 574 * [2] association ID 575 * [tlv] supported rates 576 * [tlv] extended supported rates 577 */ 578 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 579 sizeof(capinfo) 580 + sizeof(u_int16_t) 581 + sizeof(u_int16_t) 582 + 2 + IEEE80211_RATE_SIZE 583 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 584 if (m == NULL) 585 senderr(ENOMEM, is_tx_nombuf); 586 m->m_data += sizeof(struct ieee80211_frame); 587 frm = mtod(m, u_int8_t *); 588 589 capinfo = IEEE80211_CAPINFO_ESS; 590 if (ic->ic_flags & IEEE80211_F_WEPON) 591 capinfo |= IEEE80211_CAPINFO_PRIVACY; 592 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 593 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 594 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 595 *(u_int16_t *)frm = htole16(capinfo); 596 frm += 2; 597 598 *(u_int16_t *)frm = htole16(arg); /* status */ 599 frm += 2; 600 601 if (arg == IEEE80211_STATUS_SUCCESS) 602 *(u_int16_t *)frm = htole16(ni->ni_associd); 603 frm += 2; 604 605 frm = ieee80211_add_rates(frm, &ni->ni_rates); 606 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 607 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 608 break; 609 610 case IEEE80211_FC0_SUBTYPE_DISASSOC: 611 if (ifp->if_flags & IFF_DEBUG) 612 if_printf(ifp, "station %s disassociate (reason %d)\n", 613 ether_sprintf(ni->ni_macaddr), arg); 614 MGETHDR(m, M_DONTWAIT, MT_DATA); 615 if (m == NULL) 616 senderr(ENOMEM, is_tx_nombuf); 617 MH_ALIGN(m, 2); 618 m->m_pkthdr.len = m->m_len = 2; 619 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 620 break; 621 622 default: 623 IEEE80211_DPRINTF(("%s: invalid mgmt frame type %u\n", 624 __func__, type)); 625 senderr(EINVAL, is_tx_unknownmgt); 626 /* NOTREACHED */ 627 } 628 629 ret = ieee80211_mgmt_output(ifp, ni, m, type); 630 if (ret == 0) { 631 if (timer) 632 ic->ic_mgt_timer = timer; 633 } else { 634 bad: 635 if (ni != ic->ic_bss) /* remove ref we added */ 636 ieee80211_free_node(ic, ni); 637 } 638 return ret; 639 #undef senderr 640 } 641 642 void 643 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 644 struct mbuf *m) 645 { 646 /* Store the new packet on our queue, changing the TIM if necessary */ 647 648 if (IF_IS_EMPTY(&ni->ni_savedq)) { 649 ic->ic_set_tim(ic, ni->ni_associd, 1); 650 } 651 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 652 IF_DROP(&ni->ni_savedq); 653 m_freem(m); 654 if (ic->ic_if.if_flags & IFF_DEBUG) 655 printf("%s: station %s power save queue overflow" 656 " of size %d drops %d\n", 657 ic->ic_if.if_xname, 658 ether_sprintf(ni->ni_macaddr), 659 IEEE80211_PS_MAX_QUEUE, 660 ni->ni_savedq.ifq_drops); 661 } else { 662 /* Similar to ieee80211_mgmt_output, store the node in 663 * the rcvif field. 664 */ 665 IF_ENQUEUE(&ni->ni_savedq, m); 666 m->m_pkthdr.rcvif = (void *)ni; 667 } 668 } 669 670
Indexes created Mon Sep 22 21:09:42 GMT 2025