ieee80211_output.c revision 1.7
1 /* $NetBSD: ieee80211_output.c,v 1.7 2003/10/15 11:43:51 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 1.5 2003/09/01 02:55:09 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.7 2003/10/15 11:43:51 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 KASSERT(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 /* XXX statistic */ 192 goto bad; 193 } 194 } 195 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 196 197 if (ic->ic_opmode != IEEE80211_M_STA) { 198 ni = ieee80211_find_node(ic, eh.ether_dhost); 199 if (ni == NULL) { 200 /* 201 * When not in station mode the 202 * destination address should always be 203 * in the node table unless this is a 204 * multicast/broadcast frame. 205 */ 206 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 207 /* ic->ic_stats.st_tx_nonode++; XXX statistic */ 208 goto bad; 209 } 210 ni = ic->ic_bss; 211 } 212 } else 213 ni = ic->ic_bss; 214 ni->ni_inact = 0; 215 216 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 217 llc = mtod(m, struct llc *); 218 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 219 llc->llc_control = LLC_UI; 220 llc->llc_snap.org_code[0] = 0; 221 llc->llc_snap.org_code[1] = 0; 222 llc->llc_snap.org_code[2] = 0; 223 llc->llc_snap.ether_type = eh.ether_type; 224 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 225 if (m == NULL) 226 goto bad; 227 wh = mtod(m, struct ieee80211_frame *); 228 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 229 *(u_int16_t *)&wh->i_dur[0] = 0; 230 *(u_int16_t *)&wh->i_seq[0] = 231 htole16(ni->ni_txseq << IEEE80211_SEQ_SEQ_SHIFT); 232 ni->ni_txseq++; 233 switch (ic->ic_opmode) { 234 case IEEE80211_M_STA: 235 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 236 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 237 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 238 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 239 break; 240 case IEEE80211_M_IBSS: 241 case IEEE80211_M_AHDEMO: 242 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 243 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 244 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 245 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 246 break; 247 case IEEE80211_M_HOSTAP: 248 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 249 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 250 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 251 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 252 break; 253 case IEEE80211_M_MONITOR: 254 goto bad; 255 } 256 *pni = ni; 257 return m; 258 bad: 259 if (m != NULL) 260 m_freem(m); 261 if (ni && ni != ic->ic_bss) 262 ieee80211_free_node(ic, ni); 263 *pni = NULL; 264 return NULL; 265 } 266 267 /* 268 * Add a supported rates element id to a frame. 269 */ 270 u_int8_t * 271 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 272 { 273 int nrates; 274 275 *frm++ = IEEE80211_ELEMID_RATES; 276 nrates = rs->rs_nrates; 277 if (nrates > IEEE80211_RATE_SIZE) 278 nrates = IEEE80211_RATE_SIZE; 279 *frm++ = nrates; 280 memcpy(frm, rs->rs_rates, nrates); 281 return frm + nrates; 282 } 283 284 /* 285 * Add an extended supported rates element id to a frame. 286 */ 287 u_int8_t * 288 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 289 { 290 /* 291 * Add an extended supported rates element if operating in 11g mode. 292 */ 293 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 294 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 295 *frm++ = IEEE80211_ELEMID_XRATES; 296 *frm++ = nrates; 297 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 298 frm += nrates; 299 } 300 return frm; 301 } 302 303 /* 304 * Add an ssid elemet to a frame. 305 */ 306 static u_int8_t * 307 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 308 { 309 *frm++ = IEEE80211_ELEMID_SSID; 310 *frm++ = len; 311 memcpy(frm, ssid, len); 312 return frm + len; 313 } 314 315 static struct mbuf * 316 ieee80211_getmbuf(int flags, int type, u_int pktlen) 317 { 318 struct mbuf *m; 319 320 KASSERT(pktlen <= MCLBYTES, ("802.11 packet too large: %u", pktlen)); 321 #ifdef __FreeBSD__ 322 if (pktlen <= MHLEN) 323 MGETHDR(m, flags, type); 324 else 325 m = m_getcl(flags, type, M_PKTHDR); 326 #else 327 MGETHDR(m, flags, type); 328 if (m != NULL && pktlen > MHLEN) 329 MCLGET(m, flags); 330 #endif 331 return m; 332 } 333 334 /* 335 * Send a management frame. The node is for the destination (or ic_bss 336 * when in station mode). Nodes other than ic_bss have their reference 337 * count bumped to reflect our use for an indeterminant time. 338 */ 339 int 340 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 341 int type, int arg) 342 { 343 #define senderr(_x) do { ret = _x; goto bad; } while (0) 344 struct ifnet *ifp = &ic->ic_if; 345 struct mbuf *m; 346 u_int8_t *frm; 347 enum ieee80211_phymode mode; 348 u_int16_t capinfo; 349 int has_challenge, is_shared_key, ret, timer; 350 351 KASSERT(ni != NULL, ("null node")); 352 353 /* 354 * Hold a reference on the node so it doesn't go away until after 355 * the xmit is complete all the way in the driver. On error we 356 * will remove our reference. 357 */ 358 if (ni != ic->ic_bss) 359 ieee80211_ref_node(ni); 360 timer = 0; 361 switch (type) { 362 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 363 /* 364 * prreq frame format 365 * [tlv] ssid 366 * [tlv] supported rates 367 * [tlv] extended supported rates 368 */ 369 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 370 2 + ic->ic_des_esslen 371 + 2 + IEEE80211_RATE_SIZE 372 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 373 if (m == NULL) 374 senderr(ENOMEM); 375 m->m_data += sizeof(struct ieee80211_frame); 376 frm = mtod(m, u_int8_t *); 377 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 378 mode = ieee80211_chan2mode(ic, ni->ni_chan); 379 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 380 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 381 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 382 383 timer = IEEE80211_TRANS_WAIT; 384 break; 385 386 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 387 /* 388 * probe response frame format 389 * [8] time stamp 390 * [2] beacon interval 391 * [2] cabability information 392 * [tlv] ssid 393 * [tlv] supported rates 394 * [tlv] parameter set (IBSS) 395 * [tlv] extended supported rates 396 */ 397 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 398 8 + 2 + 2 + 2 399 + 2 + ni->ni_esslen 400 + 2 + IEEE80211_RATE_SIZE 401 + 6 402 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 403 if (m == NULL) 404 senderr(ENOMEM); 405 m->m_data += sizeof(struct ieee80211_frame); 406 frm = mtod(m, u_int8_t *); 407 408 memset(frm, 0, 8); /* timestamp should be filled later */ 409 frm += 8; 410 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 411 frm += 2; 412 if (ic->ic_opmode == IEEE80211_M_IBSS) 413 capinfo = IEEE80211_CAPINFO_IBSS; 414 else 415 capinfo = IEEE80211_CAPINFO_ESS; 416 if (ic->ic_flags & IEEE80211_F_WEPON) 417 capinfo |= IEEE80211_CAPINFO_PRIVACY; 418 *(u_int16_t *)frm = htole16(capinfo); 419 frm += 2; 420 421 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 422 ic->ic_bss->ni_esslen); 423 frm = ieee80211_add_rates(frm, &ic->ic_bss->ni_rates); 424 425 switch (ic->ic_phytype) { 426 case IEEE80211_T_FH: 427 *frm++ = IEEE80211_ELEMID_FHPARMS; 428 *frm++ = 5; 429 *frm++ = ni->ni_fhdwell & 0x00ff; 430 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 431 *frm++ = IEEE80211_FH_CHANSET( 432 ieee80211_chan2ieee(ic, ni->ni_chan)); 433 *frm++ = IEEE80211_FH_CHANPAT( 434 ieee80211_chan2ieee(ic, ni->ni_chan)); 435 *frm++ = ni->ni_fhindex; 436 break; 437 case IEEE80211_T_OFDM: /* probably multi-mode */ 438 default: 439 if (ieee80211_chan2mode(ic, ni->ni_chan) != 440 IEEE80211_MODE_11B) { 441 if_printf(ifp, "unhandled mode %d for %s\n", 442 ieee80211_chan2mode(ic, ni->ni_chan), 443 ether_sprintf(ni->ni_macaddr)); 444 break; 445 } 446 /*FALLTHROUGH*/ 447 case IEEE80211_T_DS: 448 *frm++ = IEEE80211_ELEMID_DSPARMS; 449 *frm++ = 1; 450 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 451 break; 452 } 453 454 if (ic->ic_opmode == IEEE80211_M_IBSS) { 455 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 456 *frm++ = 2; 457 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 458 } else { /* IEEE80211_M_HOSTAP */ 459 /* TODO: TIM */ 460 *frm++ = IEEE80211_ELEMID_TIM; 461 *frm++ = 4; /* length */ 462 *frm++ = 0; /* DTIM count */ 463 *frm++ = 1; /* DTIM period */ 464 *frm++ = 0; /* bitmap control */ 465 *frm++ = 0; /* Partial Virtual Bitmap (variable length) */ 466 } 467 frm = ieee80211_add_xrates(frm, &ic->ic_bss->ni_rates); 468 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 469 break; 470 471 case IEEE80211_FC0_SUBTYPE_AUTH: 472 MGETHDR(m, M_DONTWAIT, MT_DATA); 473 if (m == NULL) 474 senderr(ENOMEM); 475 476 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 477 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 478 ni->ni_challenge != NULL); 479 480 is_shared_key = has_challenge || (ni->ni_challenge != NULL && 481 arg == IEEE80211_AUTH_SHARED_PASS); 482 483 if (has_challenge) { 484 MH_ALIGN(m, 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN); 485 m->m_pkthdr.len = m->m_len = 486 2 * 3 + 2 + IEEE80211_CHALLENGE_LEN; 487 } else { 488 MH_ALIGN(m, 2 * 3); 489 m->m_pkthdr.len = m->m_len = 2 * 3; 490 } 491 frm = mtod(m, u_int8_t *); 492 ((u_int16_t *)frm)[0] = 493 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 494 : htole16(IEEE80211_AUTH_ALG_OPEN); 495 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 496 ((u_int16_t *)frm)[2] = 0; /* status */ 497 498 if (has_challenge) { 499 ((u_int16_t *)frm)[3] = 500 htole16((IEEE80211_CHALLENGE_LEN << 8) | 501 IEEE80211_ELEMID_CHALLENGE); 502 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 503 IEEE80211_CHALLENGE_LEN); 504 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 505 IEEE80211_DPRINTF(( 506 "%s: request encrypt frame\n", __func__)); 507 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 508 } 509 } 510 if (ic->ic_opmode == IEEE80211_M_STA) 511 timer = IEEE80211_TRANS_WAIT; 512 break; 513 514 case IEEE80211_FC0_SUBTYPE_DEAUTH: 515 if (ifp->if_flags & IFF_DEBUG) 516 if_printf(ifp, "station %s deauthenticate (reason %d)\n", 517 ether_sprintf(ni->ni_macaddr), arg); 518 MGETHDR(m, M_DONTWAIT, MT_DATA); 519 if (m == NULL) 520 senderr(ENOMEM); 521 MH_ALIGN(m, 2); 522 m->m_pkthdr.len = m->m_len = 2; 523 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 524 break; 525 526 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 527 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 528 /* 529 * asreq frame format 530 * [2] capability information 531 * [2] listen interval 532 * [6*] current AP address (reassoc only) 533 * [tlv] ssid 534 * [tlv] supported rates 535 * [tlv] extended supported rates 536 */ 537 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 538 sizeof(capinfo) 539 + sizeof(u_int16_t) 540 + IEEE80211_ADDR_LEN 541 + 2 + ni->ni_esslen 542 + 2 + IEEE80211_RATE_SIZE 543 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 544 if (m == NULL) 545 senderr(ENOMEM); 546 m->m_data += sizeof(struct ieee80211_frame); 547 frm = mtod(m, u_int8_t *); 548 549 capinfo = 0; 550 if (ic->ic_opmode == IEEE80211_M_IBSS) 551 capinfo |= IEEE80211_CAPINFO_IBSS; 552 else /* IEEE80211_M_STA */ 553 capinfo |= IEEE80211_CAPINFO_ESS; 554 if (ic->ic_flags & IEEE80211_F_WEPON) 555 capinfo |= IEEE80211_CAPINFO_PRIVACY; 556 if (ic->ic_flags & IEEE80211_F_SHPREAMBLE) 557 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 558 if (ic->ic_flags & IEEE80211_F_SHSLOT) 559 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 560 *(u_int16_t *)frm = htole16(capinfo); 561 frm += 2; 562 563 *(u_int16_t *)frm = htole16(ic->ic_lintval); 564 frm += 2; 565 566 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 567 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 568 frm += IEEE80211_ADDR_LEN; 569 } 570 571 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 572 frm = ieee80211_add_rates(frm, &ni->ni_rates); 573 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 574 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 575 576 timer = IEEE80211_TRANS_WAIT; 577 break; 578 579 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 580 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 581 /* 582 * asreq frame format 583 * [2] capability information 584 * [2] status 585 * [2] association ID 586 * [tlv] supported rates 587 * [tlv] extended supported rates 588 */ 589 m = ieee80211_getmbuf(M_DONTWAIT, MT_DATA, 590 sizeof(capinfo) 591 + sizeof(u_int16_t) 592 + sizeof(u_int16_t) 593 + 2 + IEEE80211_RATE_SIZE 594 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)); 595 if (m == NULL) 596 senderr(ENOMEM); 597 m->m_data += sizeof(struct ieee80211_frame); 598 frm = mtod(m, u_int8_t *); 599 600 capinfo = IEEE80211_CAPINFO_ESS; 601 if (ic->ic_flags & IEEE80211_F_WEPON) 602 capinfo |= IEEE80211_CAPINFO_PRIVACY; 603 *(u_int16_t *)frm = htole16(capinfo); 604 frm += 2; 605 606 *(u_int16_t *)frm = htole16(arg); /* status */ 607 frm += 2; 608 609 if (arg == IEEE80211_STATUS_SUCCESS) 610 *(u_int16_t *)frm = htole16(ni->ni_associd); 611 frm += 2; 612 613 frm = ieee80211_add_rates(frm, &ni->ni_rates); 614 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 615 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 616 break; 617 618 case IEEE80211_FC0_SUBTYPE_DISASSOC: 619 if (ifp->if_flags & IFF_DEBUG) 620 if_printf(ifp, "station %s disassociate (reason %d)\n", 621 ether_sprintf(ni->ni_macaddr), arg); 622 MGETHDR(m, M_DONTWAIT, MT_DATA); 623 if (m == NULL) 624 senderr(ENOMEM); 625 MH_ALIGN(m, 2); 626 m->m_pkthdr.len = m->m_len = 2; 627 *mtod(m, u_int16_t *) = htole16(arg); /* reason */ 628 break; 629 630 default: 631 IEEE80211_DPRINTF(("%s: invalid mgmt frame type %u\n", 632 __func__, type)); 633 senderr(EINVAL); 634 /* NOTREACHED */ 635 } 636 637 ret = ieee80211_mgmt_output(ifp, ni, m, type); 638 if (ret == 0) { 639 if (timer) 640 ic->ic_mgt_timer = timer; 641 } else { 642 bad: 643 if (ni != ic->ic_bss) /* remove ref we added */ 644 ieee80211_free_node(ic, ni); 645 } 646 return ret; 647 #undef senderr 648 } 649 650 void 651 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 652 struct mbuf *m) 653 { 654 /* Store the new packet on our queue, changing the TIM if necessary */ 655 656 if (IF_IS_EMPTY(&ni->ni_savedq)) { 657 ic->ic_set_tim(ic, ni->ni_associd, 1); 658 } 659 if (ni->ni_savedq.ifq_len >= IEEE80211_PS_MAX_QUEUE) { 660 IF_DROP(&ni->ni_savedq); 661 m_freem(m); 662 if (ic->ic_if.if_flags & IFF_DEBUG) 663 printf("%s: station %s power save queue overflow" 664 " of size %d drops %d\n", 665 ic->ic_if.if_xname, 666 ether_sprintf(ni->ni_macaddr), 667 IEEE80211_PS_MAX_QUEUE, 668 ni->ni_savedq.ifq_drops); 669 } else { 670 IF_ENQUEUE(&ni->ni_savedq, m); 671 } 672 } 673 674
Indexes created Fri Sep 26 08:10:20 GMT 2025