Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_proto.c
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1 /* $NetBSD: ieee80211_proto.c,v 1.18 2005/02/26 22:45:09 perry 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 1.8 2004/04/02 20:22:25 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_proto.c,v 1.18 2005/02/26 22:45:09 perry 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 #include <net/route.h> 92 93 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 94 95 const char *ieee80211_mgt_subtype_name[] = { 96 "assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp", 97 "probe_req", "probe_resp", "reserved#6", "reserved#7", 98 "beacon", "atim", "disassoc", "auth", 99 "deauth", "reserved#13", "reserved#14", "reserved#15" 100 }; 101 const char *ieee80211_state_name[IEEE80211_S_MAX] = { 102 "INIT", /* IEEE80211_S_INIT */ 103 "SCAN", /* IEEE80211_S_SCAN */ 104 "AUTH", /* IEEE80211_S_AUTH */ 105 "ASSOC", /* IEEE80211_S_ASSOC */ 106 "RUN" /* IEEE80211_S_RUN */ 107 }; 108 109 static int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int); 110 111 void 112 ieee80211_proto_attach(struct ifnet *ifp) 113 { 114 struct ieee80211com *ic = (void *)ifp; 115 116 ifp->if_hdrlen = sizeof(struct ieee80211_frame); 117 118 #ifdef notdef 119 ic->ic_rtsthreshold = IEEE80211_RTS_DEFAULT; 120 #else 121 ic->ic_rtsthreshold = IEEE80211_RTS_MAX; 122 #endif 123 ic->ic_fragthreshold = 2346; /* XXX not used yet */ 124 ic->ic_fixed_rate = -1; /* no fixed rate */ 125 ic->ic_protmode = IEEE80211_PROT_CTSONLY; 126 127 #ifdef __FreeBSD__ 128 mtx_init(&ic->ic_mgtq.ifq_mtx, ifp->if_xname, "mgmt send q", MTX_DEF); 129 #endif 130 131 /* protocol state change handler */ 132 ic->ic_newstate = ieee80211_newstate; 133 134 /* initialize management frame handlers */ 135 ic->ic_recv_mgmt = ieee80211_recv_mgmt; 136 ic->ic_send_mgmt = ieee80211_send_mgmt; 137 } 138 139 void 140 ieee80211_proto_detach(struct ifnet *ifp) 141 { 142 struct ieee80211com *ic = (void *)ifp; 143 144 #ifdef __FreeBSD__ 145 IF_DRAIN(&ic->ic_mgtq); 146 mtx_destroy(&ic->ic_mgtq.ifq_mtx); 147 #else 148 IF_PURGE(&ic->ic_mgtq); 149 IF_PURGE(&ic->ic_pwrsaveq); 150 #endif 151 } 152 153 void 154 ieee80211_print_essid(u_int8_t *essid, int len) 155 { 156 int i; 157 u_int8_t *p; 158 159 if (len > IEEE80211_NWID_LEN) 160 len = IEEE80211_NWID_LEN; 161 /* determine printable or not */ 162 for (i = 0, p = essid; i < len; i++, p++) { 163 if (*p < ' ' || *p > 0x7e) 164 break; 165 } 166 if (i == len) { 167 printf("\""); 168 for (i = 0, p = essid; i < len; i++, p++) 169 printf("%c", *p); 170 printf("\""); 171 } else { 172 printf("0x"); 173 for (i = 0, p = essid; i < len; i++, p++) 174 printf("%02x", *p); 175 } 176 } 177 178 void 179 ieee80211_dump_pkt(u_int8_t *buf, int len, int rate, int rssi) 180 { 181 struct ieee80211_frame *wh; 182 int i; 183 184 wh = (struct ieee80211_frame *)buf; 185 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 186 case IEEE80211_FC1_DIR_NODS: 187 printf("NODS %s", ether_sprintf(wh->i_addr2)); 188 printf("->%s", ether_sprintf(wh->i_addr1)); 189 printf("(%s)", ether_sprintf(wh->i_addr3)); 190 break; 191 case IEEE80211_FC1_DIR_TODS: 192 printf("TODS %s", ether_sprintf(wh->i_addr2)); 193 printf("->%s", ether_sprintf(wh->i_addr3)); 194 printf("(%s)", ether_sprintf(wh->i_addr1)); 195 break; 196 case IEEE80211_FC1_DIR_FROMDS: 197 printf("FRDS %s", ether_sprintf(wh->i_addr3)); 198 printf("->%s", ether_sprintf(wh->i_addr1)); 199 printf("(%s)", ether_sprintf(wh->i_addr2)); 200 break; 201 case IEEE80211_FC1_DIR_DSTODS: 202 printf("DSDS %s", ether_sprintf((u_int8_t *)&wh[1])); 203 printf("->%s", ether_sprintf(wh->i_addr3)); 204 printf("(%s", ether_sprintf(wh->i_addr2)); 205 printf("->%s)", ether_sprintf(wh->i_addr1)); 206 break; 207 } 208 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 209 case IEEE80211_FC0_TYPE_DATA: 210 printf(" data"); 211 break; 212 case IEEE80211_FC0_TYPE_MGT: 213 printf(" %s", ieee80211_mgt_subtype_name[ 214 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) 215 >> IEEE80211_FC0_SUBTYPE_SHIFT]); 216 break; 217 default: 218 printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK); 219 break; 220 } 221 if (wh->i_fc[1] & IEEE80211_FC1_WEP) 222 printf(" WEP"); 223 if (rate >= 0) 224 printf(" %dM", rate / 2); 225 if (rssi >= 0) 226 printf(" +%d", rssi); 227 printf("\n"); 228 if (len > 0) { 229 for (i = 0; i < len; i++) { 230 if ((i & 1) == 0) 231 printf(" "); 232 printf("%02x", buf[i]); 233 } 234 printf("\n"); 235 } 236 } 237 238 int 239 ieee80211_fix_rate(struct ieee80211com *ic, struct ieee80211_node *ni, int flags) 240 { 241 #define RV(v) ((v) & IEEE80211_RATE_VAL) 242 int i, j, ignore, error; 243 int okrate, badrate; 244 struct ieee80211_rateset *srs, *nrs; 245 u_int8_t r; 246 247 error = 0; 248 okrate = badrate = 0; 249 srs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 250 nrs = &ni->ni_rates; 251 for (i = 0; i < nrs->rs_nrates; ) { 252 ignore = 0; 253 if (flags & IEEE80211_F_DOSORT) { 254 /* 255 * Sort rates. 256 */ 257 for (j = i + 1; j < nrs->rs_nrates; j++) { 258 if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) { 259 r = nrs->rs_rates[i]; 260 nrs->rs_rates[i] = nrs->rs_rates[j]; 261 nrs->rs_rates[j] = r; 262 } 263 } 264 } 265 r = nrs->rs_rates[i] & IEEE80211_RATE_VAL; 266 badrate = r; 267 if (flags & IEEE80211_F_DOFRATE) { 268 /* 269 * Apply fixed rate constraint. Note that we do 270 * not apply the constraint to basic rates as 271 * otherwise we may not be able to associate if 272 * the rate set we submit to the AP is invalid 273 * (e.g. fix rate at 36Mb/s which is not a basic 274 * rate for 11a operation). 275 */ 276 if ((nrs->rs_rates[i] & IEEE80211_RATE_BASIC) == 0 && 277 ic->ic_fixed_rate >= 0 && 278 r != RV(srs->rs_rates[ic->ic_fixed_rate])) 279 ignore++; 280 } 281 if (flags & IEEE80211_F_DONEGO) { 282 /* 283 * Check against supported rates. 284 */ 285 for (j = 0; j < srs->rs_nrates; j++) { 286 if (r == RV(srs->rs_rates[j])) { 287 /* 288 * Overwrite with the supported rate 289 * value so any basic rate bit is set. 290 * This insures that response we send 291 * to stations have the necessary basic 292 * rate bit set. 293 */ 294 nrs->rs_rates[i] = srs->rs_rates[j]; 295 break; 296 } 297 } 298 if (j == srs->rs_nrates) { 299 /* 300 * A rate in the node's rate set is not 301 * supported. If this is a basic rate and we 302 * are operating as an AP then this is an error. 303 * Otherwise we just discard/ignore the rate. 304 * Note that this is important for 11b stations 305 * when they want to associate with an 11g AP. 306 */ 307 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 308 (nrs->rs_rates[i] & IEEE80211_RATE_BASIC)) 309 error++; 310 ignore++; 311 } 312 } 313 if (flags & IEEE80211_F_DODEL) { 314 /* 315 * Delete unacceptable rates. 316 */ 317 if (ignore) { 318 nrs->rs_nrates--; 319 for (j = i; j < nrs->rs_nrates; j++) 320 nrs->rs_rates[j] = nrs->rs_rates[j + 1]; 321 nrs->rs_rates[j] = 0; 322 continue; 323 } 324 } 325 if (!ignore) { 326 okrate = nrs->rs_rates[i]; 327 ni->ni_txrate = i; 328 } 329 i++; 330 } 331 if (okrate == 0 || error != 0) 332 return badrate | IEEE80211_RATE_BASIC; 333 else 334 return RV(okrate); 335 #undef RV 336 } 337 338 static int 339 ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int mgt) 340 { 341 struct ifnet *ifp = &ic->ic_if; 342 struct ieee80211_node *ni; 343 enum ieee80211_state ostate; 344 ieee80211_node_critsec_decl(s); 345 int linkstate = LINK_STATE_DOWN; 346 347 ostate = ic->ic_state; 348 IEEE80211_DPRINTF(ic, IEEE80211_MSG_STATE, ("%s: %s -> %s\n", __func__, 349 ieee80211_state_name[ostate], ieee80211_state_name[nstate])); 350 ic->ic_state = nstate; /* state transition */ 351 ni = ic->ic_bss; /* NB: no reference held */ 352 switch (nstate) { 353 case IEEE80211_S_INIT: 354 switch (ostate) { 355 case IEEE80211_S_INIT: 356 break; 357 case IEEE80211_S_RUN: 358 switch (ic->ic_opmode) { 359 case IEEE80211_M_STA: 360 IEEE80211_SEND_MGMT(ic, ni, 361 IEEE80211_FC0_SUBTYPE_DISASSOC, 362 IEEE80211_REASON_ASSOC_LEAVE); 363 break; 364 case IEEE80211_M_HOSTAP: 365 ieee80211_node_critsec_begin(ic, s); 366 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 367 if (ni->ni_associd == 0) 368 continue; 369 IEEE80211_SEND_MGMT(ic, ni, 370 IEEE80211_FC0_SUBTYPE_DISASSOC, 371 IEEE80211_REASON_ASSOC_LEAVE); 372 } 373 ieee80211_node_critsec_end(ic, s); 374 break; 375 default: 376 break; 377 } 378 /* FALLTHRU */ 379 case IEEE80211_S_ASSOC: 380 switch (ic->ic_opmode) { 381 case IEEE80211_M_STA: 382 IEEE80211_SEND_MGMT(ic, ni, 383 IEEE80211_FC0_SUBTYPE_DEAUTH, 384 IEEE80211_REASON_AUTH_LEAVE); 385 break; 386 case IEEE80211_M_HOSTAP: 387 ieee80211_node_critsec_begin(ic, s); 388 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 389 IEEE80211_SEND_MGMT(ic, ni, 390 IEEE80211_FC0_SUBTYPE_DEAUTH, 391 IEEE80211_REASON_AUTH_LEAVE); 392 } 393 ieee80211_node_critsec_end(ic, s); 394 break; 395 default: 396 break; 397 } 398 /* FALLTHRU */ 399 case IEEE80211_S_AUTH: 400 case IEEE80211_S_SCAN: 401 ic->ic_mgt_timer = 0; 402 #ifdef __FreeBSD__ 403 IF_DRAIN(&ic->ic_mgtq); 404 #else 405 IF_PURGE(&ic->ic_mgtq); 406 IF_PURGE(&ic->ic_pwrsaveq); 407 #endif 408 if (ic->ic_wep_ctx != NULL) { 409 free(ic->ic_wep_ctx, M_DEVBUF); 410 ic->ic_wep_ctx = NULL; 411 } 412 ieee80211_free_allnodes(ic); 413 break; 414 } 415 break; 416 case IEEE80211_S_SCAN: 417 ic->ic_flags &= ~IEEE80211_F_SIBSS; 418 /* initialize bss for probe request */ 419 IEEE80211_ADDR_COPY(ni->ni_macaddr, ifp->if_broadcastaddr); 420 IEEE80211_ADDR_COPY(ni->ni_bssid, ifp->if_broadcastaddr); 421 ni->ni_rates = ic->ic_sup_rates[ 422 ieee80211_chan2mode(ic, ni->ni_chan)]; 423 ni->ni_associd = 0; 424 ni->ni_rstamp = 0; 425 switch (ostate) { 426 case IEEE80211_S_INIT: 427 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 428 ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 429 /* 430 * AP operation and we already have a channel; 431 * bypass the scan and startup immediately. 432 */ 433 ieee80211_create_ibss(ic, ic->ic_des_chan); 434 } else { 435 ieee80211_begin_scan(ic); 436 } 437 break; 438 case IEEE80211_S_SCAN: 439 /* scan next */ 440 if (ic->ic_flags & IEEE80211_F_ASCAN) { 441 IEEE80211_SEND_MGMT(ic, ni, 442 IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); 443 } 444 break; 445 case IEEE80211_S_RUN: 446 /* beacon miss */ 447 IEEE80211_DPRINTF(ic, IEEE80211_MSG_STATE, 448 ("no recent beacons from %s; rescanning\n", 449 ether_sprintf(ic->ic_bss->ni_bssid))); 450 /* XXX this clears the scan set */ 451 ieee80211_free_allnodes(ic); 452 /* FALLTHRU */ 453 case IEEE80211_S_AUTH: 454 case IEEE80211_S_ASSOC: 455 /* timeout restart scan */ 456 ni = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr); 457 if (ni != NULL) { 458 ni->ni_fails++; 459 } 460 ieee80211_begin_scan(ic); 461 break; 462 } 463 break; 464 case IEEE80211_S_AUTH: 465 switch (ostate) { 466 case IEEE80211_S_INIT: 467 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 468 ("%s: invalid transition\n", __func__)); 469 break; 470 case IEEE80211_S_SCAN: 471 IEEE80211_SEND_MGMT(ic, ni, 472 IEEE80211_FC0_SUBTYPE_AUTH, 1); 473 break; 474 case IEEE80211_S_AUTH: 475 case IEEE80211_S_ASSOC: 476 switch (mgt) { 477 case IEEE80211_FC0_SUBTYPE_AUTH: 478 /* ??? */ 479 IEEE80211_SEND_MGMT(ic, ni, 480 IEEE80211_FC0_SUBTYPE_AUTH, 2); 481 break; 482 case IEEE80211_FC0_SUBTYPE_DEAUTH: 483 /* ignore and retry scan on timeout */ 484 break; 485 } 486 break; 487 case IEEE80211_S_RUN: 488 switch (mgt) { 489 case IEEE80211_FC0_SUBTYPE_AUTH: 490 IEEE80211_SEND_MGMT(ic, ni, 491 IEEE80211_FC0_SUBTYPE_AUTH, 2); 492 ic->ic_state = ostate; /* stay RUN */ 493 break; 494 case IEEE80211_FC0_SUBTYPE_DEAUTH: 495 /* try to reauth */ 496 IEEE80211_SEND_MGMT(ic, ni, 497 IEEE80211_FC0_SUBTYPE_AUTH, 1); 498 break; 499 } 500 break; 501 } 502 break; 503 case IEEE80211_S_ASSOC: 504 switch (ostate) { 505 case IEEE80211_S_INIT: 506 case IEEE80211_S_SCAN: 507 case IEEE80211_S_ASSOC: 508 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 509 ("%s: invalid transition\n", __func__)); 510 break; 511 case IEEE80211_S_AUTH: 512 IEEE80211_SEND_MGMT(ic, ni, 513 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 514 break; 515 case IEEE80211_S_RUN: 516 IEEE80211_SEND_MGMT(ic, ni, 517 IEEE80211_FC0_SUBTYPE_REASSOC_REQ, 0); 518 break; 519 } 520 break; 521 case IEEE80211_S_RUN: 522 linkstate = LINK_STATE_UP; 523 switch (ostate) { 524 case IEEE80211_S_INIT: 525 case IEEE80211_S_AUTH: 526 case IEEE80211_S_RUN: 527 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 528 ("%s: invalid transition\n", __func__)); 529 break; 530 case IEEE80211_S_SCAN: /* adhoc/hostap mode */ 531 case IEEE80211_S_ASSOC: /* infra mode */ 532 IASSERT(ni->ni_txrate < ni->ni_rates.rs_nrates, 533 ("%s: bogus xmit rate %u setup", __func__, 534 ni->ni_txrate)); 535 #ifdef IEEE80211_DEBUG 536 if (ieee80211_msg_debug(ic)) { 537 if_printf(ifp, " "); 538 if (ic->ic_opmode == IEEE80211_M_STA) 539 printf("associated "); 540 else 541 printf("synchronized "); 542 printf("with %s ssid ", 543 ether_sprintf(ni->ni_bssid)); 544 ieee80211_print_essid(ic->ic_bss->ni_essid, 545 ni->ni_esslen); 546 printf(" channel %d start %uMb\n", 547 ieee80211_chan2ieee(ic, ni->ni_chan), 548 IEEE80211_RATE2MBS(ni->ni_rates.rs_rates[ni->ni_txrate])); 549 } 550 #endif 551 ic->ic_mgt_timer = 0; 552 (*ifp->if_start)(ifp); 553 break; 554 } 555 break; 556 } 557 if (ifp->if_link_state != linkstate) { 558 ifp->if_link_state = linkstate; 559 s = splnet(); 560 rt_ifmsg(ifp); 561 splx(s); 562 } 563 return 0; 564 }
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