ieee80211_proto.c revision 1.4
1 /* $NetBSD: ieee80211_proto.c,v 1.4 2003/09/28 02:35:20 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_proto.c,v 1.3 2003/07/20 21:36:08 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_proto.c,v 1.4 2003/09/28 02:35:20 dyoung Exp $"); 39 #endif 40 41 /* 42 * IEEE 802.11 protocol support. 43 */ 44 45 #include "opt_inet.h" 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 #include <net/bpf.h> 81 82 #ifdef INET 83 #include <netinet/in.h> 84 #ifdef __FreeBSD__ 85 #include <netinet/if_ether.h> 86 #else 87 #include <net/if_ether.h> 88 #endif 89 #endif 90 91 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 92 93 const char *ieee80211_mgt_subtype_name[] = { 94 "assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp", 95 "probe_req", "probe_resp", "reserved#6", "reserved#7", 96 "beacon", "atim", "disassoc", "auth", 97 "deauth", "reserved#13", "reserved#14", "reserved#15" 98 }; 99 const char *ieee80211_state_name[IEEE80211_S_MAX] = { 100 "INIT", /* IEEE80211_S_INIT */ 101 "SCAN", /* IEEE80211_S_SCAN */ 102 "AUTH", /* IEEE80211_S_AUTH */ 103 "ASSOC", /* IEEE80211_S_ASSOC */ 104 "RUN" /* IEEE80211_S_RUN */ 105 }; 106 107 static int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int); 108 109 void 110 ieee80211_proto_attach(struct ifnet *ifp) 111 { 112 struct ieee80211com *ic = (void *)ifp; 113 114 ifp->if_hdrlen = sizeof(struct ieee80211_frame); 115 116 #ifdef notdef 117 ic->ic_rtsthreshold = IEEE80211_RTS_DEFAULT; 118 #else 119 ic->ic_rtsthreshold = IEEE80211_RTS_MAX; 120 #endif 121 ic->ic_fragthreshold = 2346; /* XXX not used yet */ 122 ic->ic_fixed_rate = -1; /* no fixed rate */ 123 124 #ifdef __FreeBSD__ 125 mtx_init(&ic->ic_mgtq.ifq_mtx, ifp->if_name, "mgmt send q", MTX_DEF); 126 #endif 127 128 /* protocol state change handler */ 129 ic->ic_newstate = ieee80211_newstate; 130 131 /* initialize management frame handlers */ 132 ic->ic_recv_mgmt = ieee80211_recv_mgmt; 133 ic->ic_send_mgmt = ieee80211_send_mgmt; 134 } 135 136 void 137 ieee80211_proto_detach(struct ifnet *ifp) 138 { 139 struct ieee80211com *ic = (void *)ifp; 140 141 #ifdef __FreeBSD__ 142 IF_DRAIN(&ic->ic_mgtq); 143 mtx_destroy(&ic->ic_mgtq.ifq_mtx); 144 #else 145 IF_PURGE(&ic->ic_mgtq); 146 #endif 147 } 148 149 void 150 ieee80211_print_essid(u_int8_t *essid, int len) 151 { 152 int i; 153 u_int8_t *p; 154 155 if (len > IEEE80211_NWID_LEN) 156 len = IEEE80211_NWID_LEN; 157 /* determine printable or not */ 158 for (i = 0, p = essid; i < len; i++, p++) { 159 if (*p < ' ' || *p > 0x7e) 160 break; 161 } 162 if (i == len) { 163 printf("\""); 164 for (i = 0, p = essid; i < len; i++, p++) 165 printf("%c", *p); 166 printf("\""); 167 } else { 168 printf("0x"); 169 for (i = 0, p = essid; i < len; i++, p++) 170 printf("%02x", *p); 171 } 172 } 173 174 void 175 ieee80211_dump_pkt(u_int8_t *buf, int len, int rate, int rssi) 176 { 177 struct ieee80211_frame *wh; 178 int i; 179 180 wh = (struct ieee80211_frame *)buf; 181 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 182 case IEEE80211_FC1_DIR_NODS: 183 printf("NODS %s", ether_sprintf(wh->i_addr2)); 184 printf("->%s", ether_sprintf(wh->i_addr1)); 185 printf("(%s)", ether_sprintf(wh->i_addr3)); 186 break; 187 case IEEE80211_FC1_DIR_TODS: 188 printf("TODS %s", ether_sprintf(wh->i_addr2)); 189 printf("->%s", ether_sprintf(wh->i_addr3)); 190 printf("(%s)", ether_sprintf(wh->i_addr1)); 191 break; 192 case IEEE80211_FC1_DIR_FROMDS: 193 printf("FRDS %s", ether_sprintf(wh->i_addr3)); 194 printf("->%s", ether_sprintf(wh->i_addr1)); 195 printf("(%s)", ether_sprintf(wh->i_addr2)); 196 break; 197 case IEEE80211_FC1_DIR_DSTODS: 198 printf("DSDS %s", ether_sprintf((u_int8_t *)&wh[1])); 199 printf("->%s", ether_sprintf(wh->i_addr3)); 200 printf("(%s", ether_sprintf(wh->i_addr2)); 201 printf("->%s)", ether_sprintf(wh->i_addr1)); 202 break; 203 } 204 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 205 case IEEE80211_FC0_TYPE_DATA: 206 printf(" data"); 207 break; 208 case IEEE80211_FC0_TYPE_MGT: 209 printf(" %s", ieee80211_mgt_subtype_name[ 210 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) 211 >> IEEE80211_FC0_SUBTYPE_SHIFT]); 212 break; 213 default: 214 printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK); 215 break; 216 } 217 if (wh->i_fc[1] & IEEE80211_FC1_WEP) 218 printf(" WEP"); 219 if (rate >= 0) 220 printf(" %dM", rate / 2); 221 if (rssi >= 0) 222 printf(" +%d", rssi); 223 printf("\n"); 224 if (len > 0) { 225 for (i = 0; i < len; i++) { 226 if ((i & 1) == 0) 227 printf(" "); 228 printf("%02x", buf[i]); 229 } 230 printf("\n"); 231 } 232 } 233 234 int 235 ieee80211_fix_rate(struct ieee80211com *ic, struct ieee80211_node *ni, int flags) 236 { 237 #define RV(v) ((v) & IEEE80211_RATE_VAL) 238 int i, j, ignore, error; 239 int okrate, badrate; 240 struct ieee80211_rateset *srs, *nrs; 241 u_int8_t r; 242 243 error = 0; 244 okrate = badrate = 0; 245 srs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 246 nrs = &ni->ni_rates; 247 for (i = 0; i < ni->ni_rates.rs_nrates; ) { 248 ignore = 0; 249 if (flags & IEEE80211_F_DOSORT) { 250 /* 251 * Sort rates. 252 */ 253 for (j = i + 1; j < nrs->rs_nrates; j++) { 254 if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) { 255 r = nrs->rs_rates[i]; 256 nrs->rs_rates[i] = nrs->rs_rates[j]; 257 nrs->rs_rates[j] = r; 258 } 259 } 260 } 261 r = nrs->rs_rates[i] & IEEE80211_RATE_VAL; 262 badrate = r; 263 if (flags & IEEE80211_F_DOFRATE) { 264 /* 265 * Apply fixed rate constraint. Note that we do 266 * not apply the constraint to basic rates as 267 * otherwise we may not be able to associate if 268 * the rate set we submit to the AP is invalid 269 * (e.g. fix rate at 36Mb/s which is not a basic 270 * rate for 11a operation). 271 */ 272 if ((nrs->rs_rates[i] & IEEE80211_RATE_BASIC) == 0 && 273 ic->ic_fixed_rate >= 0 && 274 r != RV(srs->rs_rates[ic->ic_fixed_rate])) 275 ignore++; 276 } 277 if (flags & IEEE80211_F_DONEGO) { 278 /* 279 * Check against supported rates. 280 */ 281 for (j = 0; j < srs->rs_nrates; j++) { 282 if (r == RV(srs->rs_rates[j])) 283 break; 284 } 285 if (j == srs->rs_nrates) { 286 if (nrs->rs_rates[i] & IEEE80211_RATE_BASIC) 287 error++; 288 ignore++; 289 } 290 } 291 if (flags & IEEE80211_F_DODEL) { 292 /* 293 * Delete unacceptable rates. 294 */ 295 if (ignore) { 296 nrs->rs_nrates--; 297 for (j = i; j < nrs->rs_nrates; j++) 298 nrs->rs_rates[j] = nrs->rs_rates[j + 1]; 299 nrs->rs_rates[j] = 0; 300 continue; 301 } 302 } 303 if (!ignore) 304 okrate = nrs->rs_rates[i]; 305 i++; 306 } 307 if (okrate == 0 || error != 0) 308 return badrate | IEEE80211_RATE_BASIC; 309 else 310 return RV(okrate); 311 #undef RV 312 } 313 314 static int 315 ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int mgt) 316 { 317 struct ifnet *ifp = &ic->ic_if; 318 struct ieee80211_node *ni; 319 enum ieee80211_state ostate; 320 ieee80211_node_critsec_decl(s); 321 322 ostate = ic->ic_state; 323 IEEE80211_DPRINTF(("%s: %s -> %s\n", __func__, 324 ieee80211_state_name[ostate], ieee80211_state_name[nstate])); 325 ic->ic_state = nstate; /* state transition */ 326 ni = ic->ic_bss; /* NB: no reference held */ 327 switch (nstate) { 328 case IEEE80211_S_INIT: 329 switch (ostate) { 330 case IEEE80211_S_INIT: 331 break; 332 case IEEE80211_S_RUN: 333 switch (ic->ic_opmode) { 334 case IEEE80211_M_STA: 335 IEEE80211_SEND_MGMT(ic, ni, 336 IEEE80211_FC0_SUBTYPE_DISASSOC, 337 IEEE80211_REASON_ASSOC_LEAVE); 338 break; 339 case IEEE80211_M_HOSTAP: 340 ieee80211_node_critsec_begin(ic, s); 341 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 342 if (ni->ni_associd == 0) 343 continue; 344 IEEE80211_SEND_MGMT(ic, ni, 345 IEEE80211_FC0_SUBTYPE_DISASSOC, 346 IEEE80211_REASON_ASSOC_LEAVE); 347 } 348 ieee80211_node_critsec_end(ic, s); 349 break; 350 default: 351 break; 352 } 353 /* FALLTHRU */ 354 case IEEE80211_S_ASSOC: 355 switch (ic->ic_opmode) { 356 case IEEE80211_M_STA: 357 IEEE80211_SEND_MGMT(ic, ni, 358 IEEE80211_FC0_SUBTYPE_DEAUTH, 359 IEEE80211_REASON_AUTH_LEAVE); 360 break; 361 case IEEE80211_M_HOSTAP: 362 ieee80211_node_critsec_begin(ic, s); 363 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 364 IEEE80211_SEND_MGMT(ic, ni, 365 IEEE80211_FC0_SUBTYPE_DEAUTH, 366 IEEE80211_REASON_AUTH_LEAVE); 367 } 368 ieee80211_node_critsec_end(ic, s); 369 break; 370 default: 371 break; 372 } 373 /* FALLTHRU */ 374 case IEEE80211_S_AUTH: 375 case IEEE80211_S_SCAN: 376 ic->ic_mgt_timer = 0; 377 #ifdef __FreeBSD__ 378 IF_DRAIN(&ic->ic_mgtq); 379 #else 380 IF_PURGE(&ic->ic_mgtq); 381 #endif 382 if (ic->ic_wep_ctx != NULL) { 383 free(ic->ic_wep_ctx, M_DEVBUF); 384 ic->ic_wep_ctx = NULL; 385 } 386 ieee80211_free_allnodes(ic); 387 break; 388 } 389 break; 390 case IEEE80211_S_SCAN: 391 ic->ic_flags &= ~IEEE80211_F_SIBSS; 392 /* initialize bss for probe request */ 393 IEEE80211_ADDR_COPY(ni->ni_macaddr, ifp->if_broadcastaddr); 394 IEEE80211_ADDR_COPY(ni->ni_bssid, ifp->if_broadcastaddr); 395 ni->ni_rates = ic->ic_sup_rates[ 396 ieee80211_chan2mode(ic, ni->ni_chan)]; 397 ni->ni_associd = 0; 398 ni->ni_rstamp = 0; 399 switch (ostate) { 400 case IEEE80211_S_INIT: 401 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 402 ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 403 /* 404 * AP operation and we already have a channel; 405 * bypass the scan and startup immediately. 406 */ 407 ieee80211_create_ibss(ic, ic->ic_des_chan); 408 } else { 409 ieee80211_begin_scan(ifp); 410 } 411 break; 412 case IEEE80211_S_SCAN: 413 /* scan next */ 414 if (ic->ic_flags & IEEE80211_F_ASCAN) { 415 IEEE80211_SEND_MGMT(ic, ni, 416 IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); 417 } 418 break; 419 case IEEE80211_S_RUN: 420 /* beacon miss */ 421 if (ifp->if_flags & IFF_DEBUG) { 422 /* XXX bssid clobbered above */ 423 if_printf(ifp, "no recent beacons from %s;" 424 " rescanning\n", 425 ether_sprintf(ic->ic_bss->ni_bssid)); 426 } 427 ieee80211_free_allnodes(ic); 428 /* FALLTHRU */ 429 case IEEE80211_S_AUTH: 430 case IEEE80211_S_ASSOC: 431 /* timeout restart scan */ 432 ni = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr); 433 if (ni != NULL) { 434 ni->ni_fails++; 435 ieee80211_unref_node(&ni); 436 } 437 ieee80211_begin_scan(ifp); 438 break; 439 } 440 break; 441 case IEEE80211_S_AUTH: 442 switch (ostate) { 443 case IEEE80211_S_INIT: 444 IEEE80211_DPRINTF(("%s: invalid transition\n", 445 __func__)); 446 break; 447 case IEEE80211_S_SCAN: 448 IEEE80211_SEND_MGMT(ic, ni, 449 IEEE80211_FC0_SUBTYPE_AUTH, 1); 450 break; 451 case IEEE80211_S_AUTH: 452 case IEEE80211_S_ASSOC: 453 switch (mgt) { 454 case IEEE80211_FC0_SUBTYPE_AUTH: 455 /* ??? */ 456 IEEE80211_SEND_MGMT(ic, ni, 457 IEEE80211_FC0_SUBTYPE_AUTH, 2); 458 break; 459 case IEEE80211_FC0_SUBTYPE_DEAUTH: 460 /* ignore and retry scan on timeout */ 461 break; 462 } 463 break; 464 case IEEE80211_S_RUN: 465 switch (mgt) { 466 case IEEE80211_FC0_SUBTYPE_AUTH: 467 IEEE80211_SEND_MGMT(ic, ni, 468 IEEE80211_FC0_SUBTYPE_AUTH, 2); 469 ic->ic_state = ostate; /* stay RUN */ 470 break; 471 case IEEE80211_FC0_SUBTYPE_DEAUTH: 472 /* try to reauth */ 473 IEEE80211_SEND_MGMT(ic, ni, 474 IEEE80211_FC0_SUBTYPE_AUTH, 1); 475 break; 476 } 477 break; 478 } 479 break; 480 case IEEE80211_S_ASSOC: 481 switch (ostate) { 482 case IEEE80211_S_INIT: 483 case IEEE80211_S_SCAN: 484 case IEEE80211_S_ASSOC: 485 IEEE80211_DPRINTF(("%s: invalid transition\n", 486 __func__)); 487 break; 488 case IEEE80211_S_AUTH: 489 IEEE80211_SEND_MGMT(ic, ni, 490 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 491 break; 492 case IEEE80211_S_RUN: 493 IEEE80211_SEND_MGMT(ic, ni, 494 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 1); 495 break; 496 } 497 break; 498 case IEEE80211_S_RUN: 499 switch (ostate) { 500 case IEEE80211_S_INIT: 501 case IEEE80211_S_AUTH: 502 case IEEE80211_S_RUN: 503 IEEE80211_DPRINTF(("%s: invalid transition\n", 504 __func__)); 505 break; 506 case IEEE80211_S_SCAN: /* adhoc/hostap mode */ 507 case IEEE80211_S_ASSOC: /* infra mode */ 508 KASSERT(ni->ni_txrate < ni->ni_rates.rs_nrates, 509 ("%s: bogus xmit rate %u setup\n", __func__, 510 ni->ni_txrate)); 511 if (ifp->if_flags & IFF_DEBUG) { 512 if_printf(ifp, " "); 513 if (ic->ic_opmode == IEEE80211_M_STA) 514 printf("associated "); 515 else 516 printf("synchronized "); 517 printf("with %s ssid ", 518 ether_sprintf(ni->ni_bssid)); 519 ieee80211_print_essid(ic->ic_bss->ni_essid, 520 ni->ni_esslen); 521 printf(" channel %d start %uMb\n", 522 ieee80211_chan2ieee(ic, ni->ni_chan), 523 IEEE80211_RATE2MBS(ni->ni_rates.rs_rates[ni->ni_txrate])); 524 } 525 ic->ic_mgt_timer = 0; 526 (*ifp->if_start)(ifp); 527 break; 528 } 529 break; 530 } 531 return 0; 532 } 533
Indexes created Tue Sep 23 14:10:03 GMT 2025