1 /* $NetBSD: ieee80211_node.c,v 1.60 2007/12/20 20:56:18 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 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_node.c,v 1.65 2005/08/13 17:50:21 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.60 2007/12/20 20:56:18 dyoung Exp $"); 40 #endif 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/mbuf.h> 47 #include <sys/malloc.h> 48 #include <sys/kernel.h> 49 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/endian.h> 53 #include <sys/errno.h> 54 #include <sys/proc.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_media.h> 59 #include <net/if_arp.h> 60 #include <net/if_ether.h> 61 #include <net/if_llc.h> 62 63 #include <net80211/ieee80211_netbsd.h> 64 #include <net80211/ieee80211_var.h> 65 66 #include <net/bpf.h> 67 68 #ifdef INET 69 #include <netinet/in.h> 70 #include <net/if_ether.h> 71 #endif 72 73 /* 74 * Association id's are managed with a bit vector. 75 */ 76 #define IEEE80211_AID_SET(b, w) \ 77 ((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32))) 78 #define IEEE80211_AID_CLR(b, w) \ 79 ((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32))) 80 #define IEEE80211_AID_ISSET(b, w) \ 81 ((w)[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32))) 82 83 static struct ieee80211_node *node_alloc(struct ieee80211_node_table *); 84 static void node_cleanup(struct ieee80211_node *); 85 static void node_free(struct ieee80211_node *); 86 static u_int8_t node_getrssi(const struct ieee80211_node *); 87 88 static void ieee80211_setup_node(struct ieee80211_node_table *, 89 struct ieee80211_node *, const u_int8_t *); 90 static void _ieee80211_free_node(struct ieee80211_node *); 91 static void ieee80211_free_allnodes(struct ieee80211_node_table *); 92 93 static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *); 94 static void ieee80211_timeout_stations(struct ieee80211_node_table *); 95 96 static void ieee80211_set_tim(struct ieee80211_node *, int set); 97 98 static void ieee80211_node_table_init(struct ieee80211com *ic, 99 struct ieee80211_node_table *nt, const char *name, 100 int inact, int keyixmax, 101 void (*timeout)(struct ieee80211_node_table *)); 102 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt); 103 104 MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state"); 105 106 void 107 ieee80211_node_attach(struct ieee80211com *ic) 108 { 109 110 ic->ic_node_alloc = node_alloc; 111 ic->ic_node_free = node_free; 112 ic->ic_node_cleanup = node_cleanup; 113 ic->ic_node_getrssi = node_getrssi; 114 115 /* default station inactivity timer setings */ 116 ic->ic_inact_init = IEEE80211_INACT_INIT; 117 ic->ic_inact_auth = IEEE80211_INACT_AUTH; 118 ic->ic_inact_run = IEEE80211_INACT_RUN; 119 ic->ic_inact_probe = IEEE80211_INACT_PROBE; 120 121 /* NB: driver should override */ 122 ic->ic_max_aid = IEEE80211_AID_DEF; 123 ic->ic_set_tim = ieee80211_set_tim; 124 } 125 126 void 127 ieee80211_node_lateattach(struct ieee80211com *ic) 128 { 129 struct ieee80211_rsnparms *rsn; 130 131 if (ic->ic_max_aid > IEEE80211_AID_MAX) 132 ic->ic_max_aid = IEEE80211_AID_MAX; 133 ic->ic_aid_bitmap = malloc(howmany(ic->ic_max_aid, 32) * 134 sizeof(u_int32_t), M_DEVBUF, M_NOWAIT | M_ZERO); 135 if (ic->ic_aid_bitmap == NULL) { 136 /* XXX no way to recover */ 137 printf("%s: no memory for AID bitmap!\n", __func__); 138 ic->ic_max_aid = 0; 139 } 140 141 /* XXX defer until using hostap/ibss mode */ 142 ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t); 143 ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, M_NOWAIT | M_ZERO); 144 if (ic->ic_tim_bitmap == NULL) { 145 /* XXX no way to recover */ 146 printf("%s: no memory for TIM bitmap!\n", __func__); 147 } 148 149 ieee80211_node_table_init(ic, &ic->ic_sta, "station", 150 IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix, 151 ieee80211_timeout_stations); 152 ieee80211_node_table_init(ic, &ic->ic_scan, "scan", 153 IEEE80211_INACT_SCAN, 0, 154 ieee80211_timeout_scan_candidates); 155 156 ieee80211_reset_bss(ic); 157 /* 158 * Setup "global settings" in the bss node so that 159 * each new station automatically inherits them. 160 */ 161 rsn = &ic->ic_bss->ni_rsn; 162 /* WEP, TKIP, and AES-CCM are always supported */ 163 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP; 164 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP; 165 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM; 166 if (ic->ic_caps & IEEE80211_C_AES) 167 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB; 168 if (ic->ic_caps & IEEE80211_C_CKIP) 169 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP; 170 /* 171 * Default unicast cipher to WEP for 802.1x use. If 172 * WPA is enabled the management code will set these 173 * values to reflect. 174 */ 175 rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP; 176 rsn->rsn_ucastkeylen = 104 / NBBY; 177 /* 178 * WPA says the multicast cipher is the lowest unicast 179 * cipher supported. But we skip WEP which would 180 * otherwise be used based on this criteria. 181 */ 182 rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP; 183 rsn->rsn_mcastkeylen = 128 / NBBY; 184 185 /* 186 * We support both WPA-PSK and 802.1x; the one used 187 * is determined by the authentication mode and the 188 * setting of the PSK state. 189 */ 190 rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK; 191 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 192 193 ic->ic_auth = ieee80211_authenticator_get(ic->ic_bss->ni_authmode); 194 } 195 196 void 197 ieee80211_node_detach(struct ieee80211com *ic) 198 { 199 200 if (ic->ic_bss != NULL) { 201 ieee80211_free_node(ic->ic_bss); 202 ic->ic_bss = NULL; 203 } 204 ieee80211_node_table_cleanup(&ic->ic_scan); 205 ieee80211_node_table_cleanup(&ic->ic_sta); 206 if (ic->ic_aid_bitmap != NULL) { 207 FREE(ic->ic_aid_bitmap, M_DEVBUF); 208 ic->ic_aid_bitmap = NULL; 209 } 210 if (ic->ic_tim_bitmap != NULL) { 211 FREE(ic->ic_tim_bitmap, M_DEVBUF); 212 ic->ic_tim_bitmap = NULL; 213 } 214 } 215 216 /* 217 * Port authorize/unauthorize interfaces for use by an authenticator. 218 */ 219 220 void 221 ieee80211_node_authorize(struct ieee80211_node *ni) 222 { 223 struct ieee80211com *ic = ni->ni_ic; 224 225 ni->ni_flags |= IEEE80211_NODE_AUTH; 226 ni->ni_inact_reload = ic->ic_inact_run; 227 } 228 229 void 230 ieee80211_node_unauthorize(struct ieee80211_node *ni) 231 { 232 ni->ni_flags &= ~IEEE80211_NODE_AUTH; 233 } 234 235 /* 236 * Set/change the channel. The rate set is also updated as 237 * to insure a consistent view by drivers. 238 */ 239 static void 240 ieee80211_set_chan(struct ieee80211com *ic, 241 struct ieee80211_node *ni, struct ieee80211_channel *chan) 242 { 243 if (chan == IEEE80211_CHAN_ANYC) /* XXX while scanning */ 244 chan = ic->ic_curchan; 245 ni->ni_chan = chan; 246 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; 247 } 248 249 /* 250 * AP scanning support. 251 */ 252 253 #ifdef IEEE80211_DEBUG 254 static void 255 dump_chanlist(const u_char chans[]) 256 { 257 const char *sep; 258 int i; 259 260 sep = " "; 261 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 262 if (isset(chans, i)) { 263 printf("%s%u", sep, i); 264 sep = ", "; 265 } 266 } 267 #endif /* IEEE80211_DEBUG */ 268 269 /* 270 * Initialize the channel set to scan based on the 271 * of available channels and the current PHY mode. 272 */ 273 static void 274 ieee80211_reset_scan(struct ieee80211com *ic) 275 { 276 277 /* XXX ic_des_chan should be handled with ic_chan_active */ 278 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 279 memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan)); 280 setbit(ic->ic_chan_scan, 281 ieee80211_chan2ieee(ic, ic->ic_des_chan)); 282 } else 283 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 284 sizeof(ic->ic_chan_active)); 285 #ifdef IEEE80211_DEBUG 286 if (ieee80211_msg_scan(ic)) { 287 printf("%s: scan set:", __func__); 288 dump_chanlist(ic->ic_chan_scan); 289 printf(" start chan %u\n", 290 ieee80211_chan2ieee(ic, ic->ic_curchan)); 291 } 292 #endif /* IEEE80211_DEBUG */ 293 } 294 295 /* 296 * Begin an active scan. 297 */ 298 void 299 ieee80211_begin_scan(struct ieee80211com *ic, int reset) 300 { 301 302 ic->ic_scan.nt_scangen++; 303 /* 304 * In all but hostap mode scanning starts off in 305 * an active mode before switching to passive. 306 */ 307 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 308 ic->ic_flags |= IEEE80211_F_ASCAN; 309 ic->ic_stats.is_scan_active++; 310 } else 311 ic->ic_stats.is_scan_passive++; 312 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 313 "begin %s scan in %s mode, scangen %u\n", 314 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive", 315 ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen); 316 /* 317 * Clear scan state and flush any previously seen AP's. 318 */ 319 ieee80211_reset_scan(ic); 320 if (reset) 321 ieee80211_free_allnodes(&ic->ic_scan); 322 323 ic->ic_flags |= IEEE80211_F_SCAN; 324 325 /* Scan the next channel. */ 326 ieee80211_next_scan(ic); 327 } 328 329 /* 330 * Switch to the next channel marked for scanning. 331 */ 332 int 333 ieee80211_next_scan(struct ieee80211com *ic) 334 { 335 struct ieee80211_channel *chan; 336 337 /* 338 * Insure any previous mgt frame timeouts don't fire. 339 * This assumes the driver does the right thing in 340 * flushing anything queued in the driver and below. 341 */ 342 ic->ic_mgt_timer = 0; 343 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 344 345 chan = ic->ic_curchan; 346 do { 347 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 348 chan = &ic->ic_channels[0]; 349 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 350 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 351 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 352 "%s: chan %d->%d\n", __func__, 353 ieee80211_chan2ieee(ic, ic->ic_curchan), 354 ieee80211_chan2ieee(ic, chan)); 355 ic->ic_curchan = chan; 356 /* 357 * XXX drivers should do this as needed, 358 * XXX for now maintain compatibility 359 */ 360 ic->ic_bss->ni_rates = 361 ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; 362 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 363 return 1; 364 } 365 } while (chan != ic->ic_curchan); 366 ieee80211_end_scan(ic); 367 return 0; 368 } 369 370 /* 371 * Probe the curent channel, if allowed, while scanning. 372 * If the channel is not marked passive-only then send 373 * a probe request immediately. Otherwise mark state and 374 * listen for beacons on the channel; if we receive something 375 * then we'll transmit a probe request. 376 */ 377 void 378 ieee80211_probe_curchan(struct ieee80211com *ic, int force) 379 { 380 struct ifnet *ifp = ic->ic_ifp; 381 382 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) { 383 /* 384 * XXX send both broadcast+directed probe request 385 */ 386 ieee80211_send_probereq(ic->ic_bss, 387 ic->ic_myaddr, ifp->if_broadcastaddr, 388 ifp->if_broadcastaddr, 389 ic->ic_des_essid, ic->ic_des_esslen, 390 ic->ic_opt_ie, ic->ic_opt_ie_len); 391 } else 392 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 393 } 394 395 static __inline void 396 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss) 397 { 398 /* propagate useful state */ 399 nbss->ni_authmode = obss->ni_authmode; 400 nbss->ni_txpower = obss->ni_txpower; 401 nbss->ni_vlan = obss->ni_vlan; 402 nbss->ni_rsn = obss->ni_rsn; 403 /* XXX statistics? */ 404 } 405 406 void 407 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 408 { 409 struct ieee80211_node_table *nt; 410 struct ieee80211_node *ni; 411 412 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 413 "%s: creating ibss\n", __func__); 414 415 /* 416 * Create the station/neighbor table. Note that for adhoc 417 * mode we make the initial inactivity timer longer since 418 * we create nodes only through discovery and they typically 419 * are long-lived associations. 420 */ 421 nt = &ic->ic_sta; 422 IEEE80211_NODE_LOCK(nt); 423 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 424 nt->nt_name = "station"; 425 nt->nt_inact_init = ic->ic_inact_init; 426 } else { 427 nt->nt_name = "neighbor"; 428 nt->nt_inact_init = ic->ic_inact_run; 429 } 430 IEEE80211_NODE_UNLOCK(nt); 431 432 ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr); 433 if (ni == NULL) { 434 /* XXX recovery? */ 435 return; 436 } 437 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 438 ni->ni_esslen = ic->ic_des_esslen; 439 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 440 copy_bss(ni, ic->ic_bss); 441 ni->ni_intval = ic->ic_bintval; 442 if (ic->ic_flags & IEEE80211_F_PRIVACY) 443 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 444 if (ic->ic_phytype == IEEE80211_T_FH) { 445 ni->ni_fhdwell = 200; /* XXX */ 446 ni->ni_fhindex = 1; 447 } 448 if (ic->ic_opmode == IEEE80211_M_IBSS) { 449 ic->ic_flags |= IEEE80211_F_SIBSS; 450 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */ 451 if (ic->ic_flags & IEEE80211_F_DESBSSID) 452 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); 453 else 454 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 455 } 456 /* 457 * Fix the channel and related attributes. 458 */ 459 ieee80211_set_chan(ic, ni, chan); 460 ic->ic_curchan = chan; 461 ic->ic_curmode = ieee80211_chan2mode(ic, chan); 462 /* 463 * Do mode-specific rate setup. 464 */ 465 if (ic->ic_curmode == IEEE80211_MODE_11G) { 466 /* 467 * Use a mixed 11b/11g rate set. 468 */ 469 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); 470 } else if (ic->ic_curmode == IEEE80211_MODE_11B) { 471 /* 472 * Force pure 11b rate set. 473 */ 474 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); 475 } 476 477 (void) ieee80211_sta_join(ic, ieee80211_ref_node(ni)); 478 } 479 480 void 481 ieee80211_reset_bss(struct ieee80211com *ic) 482 { 483 struct ieee80211_node *ni, *obss; 484 485 ieee80211_node_table_reset(&ic->ic_scan); 486 ieee80211_node_table_reset(&ic->ic_sta); 487 488 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); 489 IASSERT(ni != NULL, ("unable to setup inital BSS node")); 490 obss = ic->ic_bss; 491 ic->ic_bss = ieee80211_ref_node(ni); 492 if (obss != NULL) { 493 copy_bss(ni, obss); 494 ni->ni_intval = ic->ic_bintval; 495 ieee80211_free_node(obss); 496 } 497 } 498 499 /* XXX tunable */ 500 #define STA_FAILS_MAX 2 /* assoc failures before ignored */ 501 502 static int 503 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 504 { 505 u_int8_t rate; 506 int fail; 507 508 fail = 0; 509 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 510 fail |= 0x01; 511 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 512 ni->ni_chan != ic->ic_des_chan) 513 fail |= 0x01; 514 if (ic->ic_opmode == IEEE80211_M_IBSS) { 515 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 516 fail |= 0x02; 517 } else { 518 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 519 fail |= 0x02; 520 } 521 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 522 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 523 fail |= 0x04; 524 } else { 525 /* XXX does this mean privacy is supported or required? */ 526 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 527 fail |= 0x04; 528 } 529 rate = ieee80211_fix_rate(ni, IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE); 530 if (rate & IEEE80211_RATE_BASIC) 531 fail |= 0x08; 532 if (ic->ic_des_esslen != 0 && 533 (ni->ni_esslen != ic->ic_des_esslen || 534 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 535 fail |= 0x10; 536 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 537 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 538 fail |= 0x20; 539 if (ni->ni_fails >= STA_FAILS_MAX) 540 fail |= 0x40; 541 #ifdef IEEE80211_DEBUG 542 if (ieee80211_msg_scan(ic)) { 543 printf(" %c %s", 544 fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+', 545 ether_sprintf(ni->ni_macaddr)); 546 printf(" %s%c", ether_sprintf(ni->ni_bssid), 547 fail & 0x20 ? '!' : ' '); 548 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 549 fail & 0x01 ? '!' : ' '); 550 printf(" %+4d", ni->ni_rssi); 551 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 552 fail & 0x08 ? '!' : ' '); 553 printf(" %4s%c", 554 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 555 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 556 "????", 557 fail & 0x02 ? '!' : ' '); 558 printf(" %3s%c ", 559 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 560 "wep" : "no", 561 fail & 0x04 ? '!' : ' '); 562 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 563 printf("%s\n", fail & 0x10 ? "!" : ""); 564 } 565 #endif 566 return fail; 567 } 568 569 static __inline u_int8_t 570 maxrate(const struct ieee80211_node *ni) 571 { 572 const struct ieee80211_rateset *rs = &ni->ni_rates; 573 /* NB: assumes rate set is sorted (happens on frame receive) */ 574 return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL; 575 } 576 577 /* 578 * Compare the capabilities of two nodes and decide which is 579 * more desirable (return >0 if a is considered better). Note 580 * that we assume compatibility/usability has already been checked 581 * so we don't need to (e.g. validate whether privacy is supported). 582 * Used to select the best scan candidate for association in a BSS. 583 */ 584 static int 585 ieee80211_node_compare(struct ieee80211com *ic, 586 const struct ieee80211_node *a, 587 const struct ieee80211_node *b) 588 { 589 u_int8_t maxa, maxb; 590 u_int8_t rssia, rssib; 591 int weight; 592 593 /* privacy support preferred */ 594 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) && 595 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 596 return 1; 597 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 && 598 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)) 599 return -1; 600 601 /* compare count of previous failures */ 602 weight = b->ni_fails - a->ni_fails; 603 if (abs(weight) > 1) 604 return weight; 605 606 rssia = ic->ic_node_getrssi(a); 607 rssib = ic->ic_node_getrssi(b); 608 if (abs(rssib - rssia) < 5) { 609 /* best/max rate preferred if signal level close enough XXX */ 610 maxa = maxrate(a); 611 maxb = maxrate(b); 612 if (maxa != maxb) 613 return maxa - maxb; 614 /* XXX use freq for channel preference */ 615 /* for now just prefer 5 GHz band to all other bands */ 616 if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 617 !IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 618 return 1; 619 if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 620 IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 621 return -1; 622 } 623 /* all things being equal, use signal level */ 624 return rssia - rssib; 625 } 626 627 /* 628 * Mark an ongoing scan stopped. 629 */ 630 void 631 ieee80211_cancel_scan(struct ieee80211com *ic) 632 { 633 634 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n", 635 __func__, 636 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); 637 638 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); 639 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 640 } 641 642 /* 643 * Complete a scan of potential channels. 644 */ 645 void 646 ieee80211_end_scan(struct ieee80211com *ic) 647 { 648 struct ieee80211_node_table *nt = &ic->ic_scan; 649 struct ieee80211_node *ni, *selbs; 650 651 ieee80211_cancel_scan(ic); 652 ieee80211_notify_scan_done(ic); 653 654 #ifndef IEEE80211_NO_HOSTAP 655 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 656 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ 657 int i, bestchan; 658 u_int8_t rssi; 659 660 /* 661 * The passive scan to look for existing AP's completed, 662 * select a channel to camp on. Identify the channels 663 * that already have one or more AP's and try to locate 664 * an unoccupied one. If that fails, pick a channel that 665 * looks to be quietest. 666 */ 667 memset(maxrssi, 0, sizeof(maxrssi)); 668 IEEE80211_NODE_LOCK(nt); 669 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 670 rssi = ic->ic_node_getrssi(ni); 671 i = ieee80211_chan2ieee(ic, ni->ni_chan); 672 if (rssi > maxrssi[i]) 673 maxrssi[i] = rssi; 674 } 675 IEEE80211_NODE_UNLOCK(nt); 676 /* XXX select channel more intelligently */ 677 bestchan = -1; 678 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 679 if (isset(ic->ic_chan_active, i)) { 680 /* 681 * If the channel is unoccupied the max rssi 682 * should be zero; just take it. Otherwise 683 * track the channel with the lowest rssi and 684 * use that when all channels appear occupied. 685 */ 686 if (maxrssi[i] == 0) { 687 bestchan = i; 688 break; 689 } 690 if (bestchan == -1 || 691 maxrssi[i] < maxrssi[bestchan]) 692 bestchan = i; 693 } 694 if (bestchan != -1) { 695 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); 696 return; 697 } 698 /* no suitable channel, should not happen */ 699 } 700 #endif /* !IEEE80211_NO_HOSTAP */ 701 702 /* 703 * When manually sequencing the state machine; scan just once 704 * regardless of whether we have a candidate or not. The 705 * controlling application is expected to setup state and 706 * initiate an association. 707 */ 708 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) 709 return; 710 /* 711 * Automatic sequencing; look for a candidate and 712 * if found join the network. 713 */ 714 /* NB: unlocked read should be ok */ 715 if (TAILQ_FIRST(&nt->nt_node) == NULL) { 716 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 717 "%s: no scan candidate\n", __func__); 718 notfound: 719 if (ic->ic_opmode == IEEE80211_M_IBSS && 720 (ic->ic_flags & IEEE80211_F_IBSSON) && 721 ic->ic_des_esslen != 0) { 722 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 723 return; 724 } 725 /* 726 * Decrement the failure counts so entries will be 727 * reconsidered the next time around. We really want 728 * to do this only for sta's where we've previously 729 * had some success. 730 */ 731 IEEE80211_NODE_LOCK(nt); 732 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) 733 if (ni->ni_fails) 734 ni->ni_fails--; 735 IEEE80211_NODE_UNLOCK(nt); 736 /* 737 * Reset the list of channels to scan and start again. 738 */ 739 ieee80211_reset_scan(ic); 740 ic->ic_flags |= IEEE80211_F_SCAN; 741 ieee80211_next_scan(ic); 742 return; 743 } 744 selbs = NULL; 745 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", 746 "macaddr bssid chan rssi rate flag wep essid"); 747 IEEE80211_NODE_LOCK(nt); 748 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 749 if (ieee80211_match_bss(ic, ni) == 0) { 750 if (selbs == NULL) 751 selbs = ni; 752 else if (ieee80211_node_compare(ic, ni, selbs) > 0) 753 selbs = ni; 754 } 755 } 756 if (selbs != NULL) /* NB: grab ref while dropping lock */ 757 (void) ieee80211_ref_node(selbs); 758 IEEE80211_NODE_UNLOCK(nt); 759 if (selbs == NULL) 760 goto notfound; 761 if (!ieee80211_sta_join(ic, selbs)) { 762 ieee80211_free_node(selbs); 763 goto notfound; 764 } 765 } 766 767 /* 768 * Handle 802.11 ad hoc network merge. The 769 * convention, set by the Wireless Ethernet Compatibility Alliance 770 * (WECA), is that an 802.11 station will change its BSSID to match 771 * the "oldest" 802.11 ad hoc network, on the same channel, that 772 * has the station's desired SSID. The "oldest" 802.11 network 773 * sends beacons with the greatest TSF timestamp. 774 * 775 * The caller is assumed to validate TSF's before attempting a merge. 776 * 777 * Return !0 if the BSSID changed, 0 otherwise. 778 */ 779 int 780 ieee80211_ibss_merge(struct ieee80211_node *ni) 781 { 782 struct ieee80211com *ic = ni->ni_ic; 783 784 if (ni == ic->ic_bss || 785 IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 786 /* unchanged, nothing to do */ 787 return 0; 788 } 789 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ 790 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 791 "%s: merge failed, capabilities mismatch\n", __func__); 792 ic->ic_stats.is_ibss_capmismatch++; 793 return 0; 794 } 795 if (!ieee80211_sta_join(ic, ieee80211_ref_node(ni))) 796 return 0; 797 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 798 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, 799 ether_sprintf(ni->ni_bssid), 800 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 801 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 802 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" 803 ); 804 ic->ic_flags &= ~IEEE80211_F_SIBSS; 805 return 1; 806 } 807 808 /* 809 * Join the specified IBSS/BSS network. The node is assumed to 810 * be passed in with a held reference. 811 */ 812 int 813 ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) 814 { 815 struct ieee80211_node *obss; 816 817 if (ic->ic_opmode == IEEE80211_M_IBSS) { 818 struct ieee80211_node_table *nt; 819 /* 820 * Delete unusable rates; we've already checked 821 * that the negotiated rate set is acceptable. 822 */ 823 ieee80211_fix_rate(selbs, IEEE80211_F_DODEL); 824 /* 825 * Fillin the neighbor table; it will already 826 * exist if we are simply switching mastership. 827 * XXX ic_sta always setup so this is unnecessary? 828 */ 829 nt = &ic->ic_sta; 830 IEEE80211_NODE_LOCK(nt); 831 nt->nt_name = "neighbor"; 832 nt->nt_inact_init = ic->ic_inact_run; 833 IEEE80211_NODE_UNLOCK(nt); 834 } 835 836 /* 837 * Committed to selbs, setup state. 838 */ 839 obss = ic->ic_bss; 840 ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */ 841 if (obss != NULL) { 842 copy_bss(selbs, obss); 843 ieee80211_free_node(obss); 844 } 845 /* 846 * Set the erp state (mostly the slot time) to deal with 847 * the auto-select case; this should be redundant if the 848 * mode is locked. 849 */ 850 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 851 ic->ic_curchan = selbs->ni_chan; 852 ieee80211_reset_erp(ic); 853 ieee80211_wme_initparams(ic); 854 855 if (ic->ic_opmode == IEEE80211_M_STA) 856 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 857 else 858 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 859 return 1; 860 } 861 862 /* 863 * Leave the specified IBSS/BSS network. The node is assumed to 864 * be passed in with a held reference. 865 */ 866 void 867 ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 868 { 869 ic->ic_node_cleanup(ni); 870 ieee80211_notify_node_leave(ic, ni); 871 } 872 873 int 874 ieee80211_get_rate(const struct ieee80211_node * const ni) 875 { 876 #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL) 877 int ix, rate; 878 struct ieee80211com *ic = ni->ni_ic; 879 const struct ieee80211_rateset *rs; 880 881 IASSERT(ni != NULL, ("ni != NULL")); 882 IASSERT(ieee80211_node_refcnt(ni) > 0, 883 ("refcnt(ni) == %d", ieee80211_node_refcnt(ni))); 884 IASSERT(ic != NULL, ("ic != NULL")); 885 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 886 rs = &ic->ic_sup_rates[ic->ic_curmode]; 887 rate = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL; 888 for (ix = ni->ni_rates.rs_nrates - 1; 889 ix >= 0 && RATE(ix) != rate; ix--) 890 ; 891 if (ix < 0) { 892 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG, 893 "%s: fixed rate %d (%d.%d Mb/s) not in rate set", 894 __func__, ic->ic_fixed_rate, (rate * 5) / 10, 895 (rate * 5) % 10); 896 goto no_rate; 897 } 898 } else if (ic->ic_state == IEEE80211_S_RUN) 899 rate = ni->ni_rates.rs_rates[ni->ni_txrate]; 900 else { 901 no_rate: 902 rs = &ni->ni_rates; 903 /* Choose node's lowest basic rate, or else its lowest rate. */ 904 for (ix = 0; ix < rs->rs_nrates; ix++) { 905 if (rs->rs_rates[ix] & IEEE80211_RATE_BASIC) 906 return rs->rs_rates[ix] & IEEE80211_RATE_VAL; 907 } 908 return ni->ni_rates.rs_rates[0] & IEEE80211_RATE_VAL; 909 } 910 return rate & IEEE80211_RATE_VAL; 911 } 912 913 static struct ieee80211_node * 914 node_alloc(struct ieee80211_node_table *nt) 915 { 916 struct ieee80211_node *ni; 917 918 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 919 M_80211_NODE, M_NOWAIT | M_ZERO); 920 return ni; 921 } 922 923 /* 924 * Reclaim any resources in a node and reset any critical 925 * state. Typically nodes are free'd immediately after, 926 * but in some cases the storage may be reused so we need 927 * to insure consistent state (should probably fix that). 928 */ 929 static void 930 node_cleanup(struct ieee80211_node *ni) 931 { 932 #define N(a) (sizeof(a)/sizeof(a[0])) 933 struct ieee80211com *ic = ni->ni_ic; 934 int i, qlen; 935 936 /* NB: preserve ni_table */ 937 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 938 ic->ic_ps_sta--; 939 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 940 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 941 "[%s] power save mode off, %u sta's in ps mode\n", 942 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 943 } 944 /* 945 * Clear AREF flag that marks the authorization refcnt bump 946 * has happened. This is probably not needed as the node 947 * should always be removed from the table so not found but 948 * do it just in case. 949 */ 950 ni->ni_flags &= ~IEEE80211_NODE_AREF; 951 952 /* 953 * Drain power save queue and, if needed, clear TIM. 954 */ 955 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 956 if (qlen != 0 && ic->ic_set_tim != NULL) 957 ic->ic_set_tim(ni, 0); 958 959 ni->ni_associd = 0; 960 if (ni->ni_challenge != NULL) { 961 FREE(ni->ni_challenge, M_DEVBUF); 962 ni->ni_challenge = NULL; 963 } 964 /* 965 * Preserve SSID, WPA, and WME ie's so the bss node is 966 * reusable during a re-auth/re-assoc state transition. 967 * If we remove these data they will not be recreated 968 * because they come from a probe-response or beacon frame 969 * which cannot be expected prior to the association-response. 970 * This should not be an issue when operating in other modes 971 * as stations leaving always go through a full state transition 972 * which will rebuild this state. 973 * 974 * XXX does this leave us open to inheriting old state? 975 */ 976 for (i = 0; i < N(ni->ni_rxfrag); i++) 977 if (ni->ni_rxfrag[i] != NULL) { 978 m_freem(ni->ni_rxfrag[i]); 979 ni->ni_rxfrag[i] = NULL; 980 } 981 /* 982 * Must be careful here to remove any key map entry w/o a LOR. 983 */ 984 ieee80211_node_delucastkey(ni); 985 #undef N 986 } 987 988 static void 989 node_free(struct ieee80211_node *ni) 990 { 991 struct ieee80211com *ic = ni->ni_ic; 992 993 ic->ic_node_cleanup(ni); 994 if (ni->ni_wpa_ie != NULL) 995 FREE(ni->ni_wpa_ie, M_DEVBUF); 996 if (ni->ni_wme_ie != NULL) 997 FREE(ni->ni_wme_ie, M_DEVBUF); 998 IEEE80211_NODE_SAVEQ_DESTROY(ni); 999 FREE(ni, M_80211_NODE); 1000 } 1001 1002 static u_int8_t 1003 node_getrssi(const struct ieee80211_node *ni) 1004 { 1005 return ni->ni_rssi; 1006 } 1007 1008 static void 1009 ieee80211_setup_node(struct ieee80211_node_table *nt, 1010 struct ieee80211_node *ni, const u_int8_t *macaddr) 1011 { 1012 struct ieee80211com *ic = nt->nt_ic; 1013 int hash; 1014 1015 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1016 "%s %p<%s> in %s table\n", __func__, ni, 1017 ether_sprintf(macaddr), nt->nt_name); 1018 1019 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 1020 hash = IEEE80211_NODE_HASH(macaddr); 1021 ieee80211_node_initref(ni); /* mark referenced */ 1022 ni->ni_chan = IEEE80211_CHAN_ANYC; 1023 ni->ni_authmode = IEEE80211_AUTH_OPEN; 1024 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 1025 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 1026 ni->ni_inact_reload = nt->nt_inact_init; 1027 ni->ni_inact = ni->ni_inact_reload; 1028 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 1029 1030 IEEE80211_NODE_LOCK(nt); 1031 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 1032 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 1033 ni->ni_table = nt; 1034 ni->ni_ic = ic; 1035 IEEE80211_NODE_UNLOCK(nt); 1036 } 1037 1038 struct ieee80211_node * 1039 ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1040 { 1041 struct ieee80211com *ic = nt->nt_ic; 1042 struct ieee80211_node *ni; 1043 1044 ni = ic->ic_node_alloc(nt); 1045 if (ni != NULL) 1046 ieee80211_setup_node(nt, ni, macaddr); 1047 else 1048 ic->ic_stats.is_rx_nodealloc++; 1049 return ni; 1050 } 1051 1052 /* 1053 * Craft a temporary node suitable for sending a management frame 1054 * to the specified station. We craft only as much state as we 1055 * need to do the work since the node will be immediately reclaimed 1056 * once the send completes. 1057 */ 1058 struct ieee80211_node * 1059 ieee80211_tmp_node(struct ieee80211com *ic, const u_int8_t *macaddr) 1060 { 1061 struct ieee80211_node *ni; 1062 1063 ni = ic->ic_node_alloc(&ic->ic_sta); 1064 if (ni != NULL) { 1065 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1066 "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr)); 1067 1068 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 1069 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 1070 ieee80211_node_initref(ni); /* mark referenced */ 1071 ni->ni_txpower = ic->ic_bss->ni_txpower; 1072 /* NB: required by ieee80211_fix_rate */ 1073 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 1074 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, 1075 IEEE80211_KEYIX_NONE); 1076 /* XXX optimize away */ 1077 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 1078 1079 ni->ni_table = NULL; /* NB: pedantic */ 1080 ni->ni_ic = ic; 1081 } else { 1082 /* XXX msg */ 1083 ic->ic_stats.is_rx_nodealloc++; 1084 } 1085 return ni; 1086 } 1087 1088 struct ieee80211_node * 1089 ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1090 { 1091 struct ieee80211com *ic = nt->nt_ic; 1092 struct ieee80211_node *ni; 1093 1094 ni = ic->ic_node_alloc(nt); 1095 if (ni != NULL) { 1096 ieee80211_setup_node(nt, ni, macaddr); 1097 /* 1098 * Inherit from ic_bss. 1099 */ 1100 ni->ni_authmode = ic->ic_bss->ni_authmode; 1101 ni->ni_txpower = ic->ic_bss->ni_txpower; 1102 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 1103 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 1104 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 1105 ni->ni_rsn = ic->ic_bss->ni_rsn; 1106 } else 1107 ic->ic_stats.is_rx_nodealloc++; 1108 return ni; 1109 } 1110 1111 static struct ieee80211_node * 1112 #ifdef IEEE80211_DEBUG_REFCNT 1113 _ieee80211_find_node_debug(struct ieee80211_node_table *nt, 1114 const u_int8_t *macaddr, const char *func, int line) 1115 #else 1116 _ieee80211_find_node(struct ieee80211_node_table *nt, 1117 const u_int8_t *macaddr) 1118 #endif 1119 { 1120 struct ieee80211_node *ni; 1121 int hash; 1122 1123 IEEE80211_NODE_LOCK_ASSERT(nt); 1124 1125 hash = IEEE80211_NODE_HASH(macaddr); 1126 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1127 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 1128 ieee80211_ref_node(ni); /* mark referenced */ 1129 #ifdef IEEE80211_DEBUG_REFCNT 1130 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1131 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, 1132 func, line, 1133 ni, ether_sprintf(ni->ni_macaddr), 1134 ieee80211_node_refcnt(ni)); 1135 #endif 1136 return ni; 1137 } 1138 } 1139 return NULL; 1140 } 1141 #ifdef IEEE80211_DEBUG_REFCNT 1142 #define _ieee80211_find_node(nt, mac) \ 1143 _ieee80211_find_node_debug(nt, mac, func, line) 1144 #endif 1145 1146 struct ieee80211_node * 1147 #ifdef IEEE80211_DEBUG_REFCNT 1148 ieee80211_find_node_debug(struct ieee80211_node_table *nt, 1149 const u_int8_t *macaddr, const char *func, int line) 1150 #else 1151 ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1152 #endif 1153 { 1154 struct ieee80211_node *ni; 1155 1156 IEEE80211_NODE_LOCK(nt); 1157 ni = _ieee80211_find_node(nt, macaddr); 1158 IEEE80211_NODE_UNLOCK(nt); 1159 return ni; 1160 } 1161 1162 /* 1163 * Fake up a node; this handles node discovery in adhoc mode. 1164 * Note that for the driver's benefit we we treat this like 1165 * an association so the driver has an opportunity to setup 1166 * it's private state. 1167 */ 1168 struct ieee80211_node * 1169 ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1170 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1171 { 1172 struct ieee80211com *ic = nt->nt_ic; 1173 struct ieee80211_node *ni; 1174 1175 ni = ieee80211_dup_bss(nt, macaddr); 1176 if (ni != NULL) { 1177 /* XXX no rate negotiation; just dup */ 1178 ni->ni_rates = ic->ic_bss->ni_rates; 1179 if (ic->ic_newassoc != NULL) 1180 ic->ic_newassoc(ni, 1); 1181 /* XXX not right for 802.1x/WPA */ 1182 ieee80211_node_authorize(ni); 1183 } 1184 return ni; 1185 } 1186 1187 #ifdef IEEE80211_DEBUG 1188 static void 1189 dump_probe_beacon(u_int8_t subtype, int isnew, 1190 const u_int8_t mac[IEEE80211_ADDR_LEN], 1191 const struct ieee80211_scanparams *sp) 1192 { 1193 1194 printf("[%s] %s%s on chan %u (bss chan %u) ", 1195 ether_sprintf(mac), isnew ? "new " : "", 1196 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1197 sp->chan, sp->bchan); 1198 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1199 printf("\n"); 1200 1201 if (isnew) { 1202 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1203 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1204 if (sp->country != NULL) { 1205 #ifdef __FreeBSD__ 1206 printf(" country info %*D", 1207 sp->country[1], sp->country+2, " "); 1208 #else 1209 int i; 1210 printf(" country info"); 1211 for (i = 0; i < sp->country[1]; i++) 1212 printf(" %02x", sp->country[i+2]); 1213 #endif 1214 } 1215 printf("\n"); 1216 } 1217 } 1218 #endif /* IEEE80211_DEBUG */ 1219 1220 static void 1221 saveie(u_int8_t **iep, const u_int8_t *ie) 1222 { 1223 1224 if (ie == NULL) 1225 *iep = NULL; 1226 else 1227 ieee80211_saveie(iep, ie); 1228 } 1229 1230 /* 1231 * Process a beacon or probe response frame. 1232 */ 1233 void 1234 ieee80211_add_scan(struct ieee80211com *ic, 1235 const struct ieee80211_scanparams *sp, 1236 const struct ieee80211_frame *wh, 1237 int subtype, int rssi, int rstamp) 1238 { 1239 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1240 struct ieee80211_node_table *nt = &ic->ic_scan; 1241 struct ieee80211_node *ni; 1242 int newnode = 0; 1243 1244 ni = ieee80211_find_node(nt, wh->i_addr2); 1245 if (ni == NULL) { 1246 /* 1247 * Create a new entry. 1248 */ 1249 ni = ic->ic_node_alloc(nt); 1250 if (ni == NULL) { 1251 ic->ic_stats.is_rx_nodealloc++; 1252 return; 1253 } 1254 ieee80211_setup_node(nt, ni, wh->i_addr2); 1255 /* 1256 * XXX inherit from ic_bss. 1257 */ 1258 ni->ni_authmode = ic->ic_bss->ni_authmode; 1259 ni->ni_txpower = ic->ic_bss->ni_txpower; 1260 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 1261 ieee80211_set_chan(ic, ni, ic->ic_curchan); 1262 ni->ni_rsn = ic->ic_bss->ni_rsn; 1263 newnode = 1; 1264 } 1265 #ifdef IEEE80211_DEBUG 1266 if (ieee80211_msg_scan(ic) && (ic->ic_flags & IEEE80211_F_SCAN)) 1267 dump_probe_beacon(subtype, newnode, wh->i_addr2, sp); 1268 #endif 1269 /* XXX ap beaconing multiple ssid w/ same bssid */ 1270 if (sp->ssid[1] != 0 && 1271 (ISPROBE(subtype) || ni->ni_esslen == 0)) { 1272 ni->ni_esslen = sp->ssid[1]; 1273 memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); 1274 memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]); 1275 } 1276 ni->ni_scangen = ic->ic_scan.nt_scangen; 1277 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); 1278 ni->ni_rssi = rssi; 1279 ni->ni_rstamp = rstamp; 1280 memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp)); 1281 ni->ni_intval = sp->bintval; 1282 ni->ni_capinfo = sp->capinfo; 1283 ni->ni_chan = &ic->ic_channels[sp->chan]; 1284 ni->ni_fhdwell = sp->fhdwell; 1285 ni->ni_fhindex = sp->fhindex; 1286 ni->ni_erp = sp->erp; 1287 if (sp->tim != NULL) { 1288 struct ieee80211_tim_ie *ie = 1289 (struct ieee80211_tim_ie *) sp->tim; 1290 1291 ni->ni_dtim_count = ie->tim_count; 1292 ni->ni_dtim_period = ie->tim_period; 1293 } 1294 /* 1295 * Record the byte offset from the mac header to 1296 * the start of the TIM information element for 1297 * use by hardware and/or to speedup software 1298 * processing of beacon frames. 1299 */ 1300 ni->ni_timoff = sp->timoff; 1301 /* 1302 * Record optional information elements that might be 1303 * used by applications or drivers. 1304 */ 1305 saveie(&ni->ni_wme_ie, sp->wme); 1306 saveie(&ni->ni_wpa_ie, sp->wpa); 1307 1308 /* NB: must be after ni_chan is setup */ 1309 ieee80211_setup_rates(ni, sp->rates, sp->xrates, IEEE80211_F_DOSORT); 1310 1311 if (!newnode) 1312 ieee80211_free_node(ni); 1313 #undef ISPROBE 1314 } 1315 1316 void 1317 ieee80211_init_neighbor(struct ieee80211com *ic, struct ieee80211_node *ni, 1318 const struct ieee80211_frame *wh, const struct ieee80211_scanparams *sp, 1319 int isnew) 1320 { 1321 ni->ni_esslen = sp->ssid[1]; 1322 memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]); 1323 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); 1324 memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp)); 1325 ni->ni_intval = sp->bintval; 1326 ni->ni_capinfo = sp->capinfo; 1327 ni->ni_chan = ic->ic_bss->ni_chan; 1328 ni->ni_fhdwell = sp->fhdwell; 1329 ni->ni_fhindex = sp->fhindex; 1330 ni->ni_erp = sp->erp; 1331 ni->ni_timoff = sp->timoff; 1332 if (sp->wme != NULL) 1333 ieee80211_saveie(&ni->ni_wme_ie, sp->wme); 1334 if (sp->wpa != NULL) 1335 ieee80211_saveie(&ni->ni_wpa_ie, sp->wpa); 1336 1337 /* NB: must be after ni_chan is setup */ 1338 ieee80211_setup_rates(ni, sp->rates, sp->xrates, 1339 IEEE80211_F_DODEL | IEEE80211_F_DONEGO | IEEE80211_F_DOSORT); 1340 1341 if (ic->ic_newassoc != NULL) 1342 ic->ic_newassoc(ni, isnew); 1343 } 1344 1345 /* 1346 * Do node discovery in adhoc mode on receipt of a beacon 1347 * or probe response frame. Note that for the driver's 1348 * benefit we we treat this like an association so the 1349 * driver has an opportunity to setup it's private state. 1350 */ 1351 struct ieee80211_node * 1352 ieee80211_add_neighbor(struct ieee80211com *ic, 1353 const struct ieee80211_frame *wh, 1354 const struct ieee80211_scanparams *sp) 1355 { 1356 struct ieee80211_node *ni; 1357 1358 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */ 1359 if (ni != NULL) { 1360 ieee80211_init_neighbor(ic, ni, wh, sp, 1); 1361 /* XXX not right for 802.1x/WPA */ 1362 ieee80211_node_authorize(ni); 1363 } 1364 return ni; 1365 } 1366 1367 #define IS_CTL(wh) \ 1368 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1369 #define IS_PSPOLL(wh) \ 1370 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1371 /* 1372 * Locate the node for sender, track state, and then pass the 1373 * (referenced) node up to the 802.11 layer for its use. We 1374 * are required to pass some node so we fall back to ic_bss 1375 * when this frame is from an unknown sender. The 802.11 layer 1376 * knows this means the sender wasn't in the node table and 1377 * acts accordingly. 1378 */ 1379 struct ieee80211_node * 1380 #ifdef IEEE80211_DEBUG_REFCNT 1381 ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1382 const struct ieee80211_frame_min *wh, const char *func, int line) 1383 #else 1384 ieee80211_find_rxnode(struct ieee80211com *ic, 1385 const struct ieee80211_frame_min *wh) 1386 #endif 1387 { 1388 struct ieee80211_node_table *nt; 1389 struct ieee80211_node *ni; 1390 1391 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1392 if (ic->ic_opmode == IEEE80211_M_STA || 1393 ic->ic_opmode == IEEE80211_M_MONITOR || 1394 (ic->ic_flags & IEEE80211_F_SCAN)) 1395 nt = &ic->ic_scan; 1396 else 1397 nt = &ic->ic_sta; 1398 /* XXX check ic_bss first in station mode */ 1399 /* XXX 4-address frames? */ 1400 IEEE80211_NODE_LOCK(nt); 1401 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1402 ni = _ieee80211_find_node(nt, wh->i_addr1); 1403 else 1404 ni = _ieee80211_find_node(nt, wh->i_addr2); 1405 if (ni == NULL) 1406 ni = ieee80211_ref_node(ic->ic_bss); 1407 IEEE80211_NODE_UNLOCK(nt); 1408 1409 return ni; 1410 } 1411 1412 /* 1413 * Like ieee80211_find_rxnode but use the supplied h/w 1414 * key index as a hint to locate the node in the key 1415 * mapping table. If an entry is present at the key 1416 * index we return it; otherwise do a normal lookup and 1417 * update the mapping table if the station has a unicast 1418 * key assigned to it. 1419 */ 1420 struct ieee80211_node * 1421 #ifdef IEEE80211_DEBUG_REFCNT 1422 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic, 1423 const struct ieee80211_frame_min *wh, ieee80211_keyix keyix, 1424 const char *func, int line) 1425 #else 1426 ieee80211_find_rxnode_withkey(struct ieee80211com *ic, 1427 const struct ieee80211_frame_min *wh, ieee80211_keyix keyix) 1428 #endif 1429 { 1430 struct ieee80211_node_table *nt; 1431 struct ieee80211_node *ni; 1432 1433 if (ic->ic_opmode == IEEE80211_M_STA || 1434 ic->ic_opmode == IEEE80211_M_MONITOR || 1435 (ic->ic_flags & IEEE80211_F_SCAN)) 1436 nt = &ic->ic_scan; 1437 else 1438 nt = &ic->ic_sta; 1439 IEEE80211_NODE_LOCK(nt); 1440 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) 1441 ni = nt->nt_keyixmap[keyix]; 1442 else 1443 ni = NULL; 1444 if (ni == NULL) { 1445 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1446 ni = _ieee80211_find_node(nt, wh->i_addr1); 1447 else 1448 ni = _ieee80211_find_node(nt, wh->i_addr2); 1449 if (ni == NULL) 1450 ni = ieee80211_ref_node(ic->ic_bss); 1451 if (nt->nt_keyixmap != NULL) { 1452 /* 1453 * If the station has a unicast key cache slot 1454 * assigned update the key->node mapping table. 1455 */ 1456 keyix = ni->ni_ucastkey.wk_rxkeyix; 1457 /* XXX can keyixmap[keyix] != NULL? */ 1458 if (keyix < nt->nt_keyixmax && 1459 nt->nt_keyixmap[keyix] == NULL) { 1460 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1461 "%s: add key map entry %p<%s> refcnt %d\n", 1462 __func__, ni, ether_sprintf(ni->ni_macaddr), 1463 ieee80211_node_refcnt(ni)+1); 1464 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni); 1465 } 1466 } 1467 } else { 1468 ieee80211_ref_node(ni); 1469 } 1470 IEEE80211_NODE_UNLOCK(nt); 1471 1472 return ni; 1473 } 1474 #undef IS_PSPOLL 1475 #undef IS_CTL 1476 1477 /* 1478 * Return a reference to the appropriate node for sending 1479 * a data frame. This handles node discovery in adhoc networks. 1480 */ 1481 struct ieee80211_node * 1482 #ifdef IEEE80211_DEBUG_REFCNT 1483 ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1484 const char *func, int line) 1485 #else 1486 ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1487 #endif 1488 { 1489 struct ieee80211_node_table *nt = &ic->ic_sta; 1490 struct ieee80211_node *ni; 1491 1492 /* 1493 * The destination address should be in the node table 1494 * unless this is a multicast/broadcast frame. We can 1495 * also optimize station mode operation, all frames go 1496 * to the bss node. 1497 */ 1498 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1499 IEEE80211_NODE_LOCK(nt); 1500 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) 1501 ni = ieee80211_ref_node(ic->ic_bss); 1502 else 1503 ni = _ieee80211_find_node(nt, macaddr); 1504 IEEE80211_NODE_UNLOCK(nt); 1505 1506 if (ni == NULL) { 1507 if (ic->ic_opmode == IEEE80211_M_IBSS || 1508 ic->ic_opmode == IEEE80211_M_AHDEMO) { 1509 /* 1510 * In adhoc mode cons up a node for the destination. 1511 * Note that we need an additional reference for the 1512 * caller to be consistent with _ieee80211_find_node. 1513 */ 1514 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1515 if (ni != NULL) 1516 (void) ieee80211_ref_node(ni); 1517 } else { 1518 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1519 "[%s] no node, discard frame (%s)\n", 1520 ether_sprintf(macaddr), __func__); 1521 ic->ic_stats.is_tx_nonode++; 1522 } 1523 } 1524 return ni; 1525 } 1526 1527 /* 1528 * Like find but search based on the channel too. 1529 */ 1530 struct ieee80211_node * 1531 #ifdef IEEE80211_DEBUG_REFCNT 1532 ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1533 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1534 const char *func, int line) 1535 #else 1536 ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1537 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1538 #endif 1539 { 1540 struct ieee80211_node *ni; 1541 int hash; 1542 1543 hash = IEEE80211_NODE_HASH(macaddr); 1544 IEEE80211_NODE_LOCK(nt); 1545 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1546 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1547 ni->ni_chan == chan) { 1548 ieee80211_ref_node(ni); /* mark referenced */ 1549 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1550 #ifdef IEEE80211_DEBUG_REFCNT 1551 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, 1552 func, line, 1553 #else 1554 "%s %p<%s> refcnt %d\n", __func__, 1555 #endif 1556 ni, ether_sprintf(ni->ni_macaddr), 1557 ieee80211_node_refcnt(ni)); 1558 break; 1559 } 1560 } 1561 IEEE80211_NODE_UNLOCK(nt); 1562 return ni; 1563 } 1564 1565 struct ieee80211_node * 1566 ieee80211_refine_node_for_beacon(struct ieee80211com *ic, 1567 struct ieee80211_node *ni0, struct ieee80211_channel *chan, 1568 const u_int8_t *ssid) 1569 { 1570 struct ieee80211_node_table *nt = ni0->ni_table; 1571 struct ieee80211_node *best, *ni; 1572 int best_score = 0, score; 1573 1574 if (nt == NULL) 1575 return ni0; 1576 1577 best = ni0; 1578 if (ssid[1] == 0 || best->ni_esslen == 0) 1579 best_score = 1; 1580 else if (ssid[1] == best->ni_esslen && 1581 memcmp(ssid + 2, best->ni_essid, ssid[1]) == 0) 1582 best_score = 2; 1583 else 1584 best_score = 0; 1585 1586 IEEE80211_NODE_LOCK(nt); 1587 for (ni = LIST_NEXT(ni0, ni_hash); ni != NULL; 1588 ni = LIST_NEXT(ni, ni_hash)) { 1589 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, best->ni_macaddr) || 1590 ni->ni_ic != best->ni_ic || ni->ni_chan != chan) 1591 continue; 1592 1593 if (ssid[1] == 0 || ni->ni_esslen == 0) 1594 score = 1; 1595 else if (ssid[1] == ni->ni_esslen && 1596 memcmp(ssid + 2, ni->ni_essid, ssid[1]) == 0) 1597 score = 2; 1598 else 1599 continue; 1600 1601 if (score > best_score) { 1602 best = ni; 1603 best_score = score; 1604 } 1605 } 1606 IEEE80211_NODE_UNLOCK(nt); 1607 return best; 1608 } 1609 1610 /* 1611 * Like find but search based on the ssid too. 1612 */ 1613 struct ieee80211_node * 1614 #ifdef IEEE80211_DEBUG_REFCNT 1615 ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, 1616 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, 1617 const char *func, int line) 1618 #else 1619 ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, 1620 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) 1621 #endif 1622 { 1623 #define MATCH_SSID(ni, ssid, ssidlen) \ 1624 (ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0) 1625 static const u_int8_t zeromac[IEEE80211_ADDR_LEN]; 1626 struct ieee80211com *ic = nt->nt_ic; 1627 struct ieee80211_node *ni; 1628 int hash; 1629 1630 IEEE80211_NODE_LOCK(nt); 1631 /* 1632 * A mac address that is all zero means match only the ssid; 1633 * otherwise we must match both. 1634 */ 1635 if (IEEE80211_ADDR_EQ(macaddr, zeromac)) { 1636 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1637 if (MATCH_SSID(ni, ssid, ssidlen)) 1638 break; 1639 } 1640 } else { 1641 hash = IEEE80211_NODE_HASH(macaddr); 1642 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1643 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1644 MATCH_SSID(ni, ssid, ssidlen)) 1645 break; 1646 } 1647 } 1648 if (ni != NULL) { 1649 ieee80211_ref_node(ni); /* mark referenced */ 1650 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1651 #ifdef IEEE80211_DEBUG_REFCNT 1652 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, 1653 func, line, 1654 #else 1655 "%s %p<%s> refcnt %d\n", __func__, 1656 #endif 1657 ni, ether_sprintf(ni->ni_macaddr), 1658 ieee80211_node_refcnt(ni)); 1659 } 1660 IEEE80211_NODE_UNLOCK(nt); 1661 return ni; 1662 #undef MATCH_SSID 1663 } 1664 1665 static void 1666 _ieee80211_free_node(struct ieee80211_node *ni) 1667 { 1668 struct ieee80211com *ic = ni->ni_ic; 1669 struct ieee80211_node_table *nt = ni->ni_table; 1670 1671 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1672 "%s %p<%s> in %s table\n", __func__, ni, 1673 ether_sprintf(ni->ni_macaddr), 1674 nt != NULL ? nt->nt_name : "<gone>"); 1675 1676 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1677 if (nt != NULL) { 1678 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1679 LIST_REMOVE(ni, ni_hash); 1680 } 1681 ic->ic_node_free(ni); 1682 } 1683 1684 void 1685 #ifdef IEEE80211_DEBUG_REFCNT 1686 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1687 #else 1688 ieee80211_free_node(struct ieee80211_node *ni) 1689 #endif 1690 { 1691 struct ieee80211_node_table *nt = ni->ni_table; 1692 1693 #ifdef IEEE80211_DEBUG_REFCNT 1694 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1695 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, 1696 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1697 #endif 1698 if (nt != NULL) { 1699 IEEE80211_NODE_LOCK(nt); 1700 if (ieee80211_node_dectestref(ni)) { 1701 /* 1702 * Last reference, reclaim state. 1703 */ 1704 _ieee80211_free_node(ni); 1705 } else if (ieee80211_node_refcnt(ni) == 1 && 1706 nt->nt_keyixmap != NULL) { 1707 ieee80211_keyix keyix; 1708 /* 1709 * Check for a last reference in the key mapping table. 1710 */ 1711 keyix = ni->ni_ucastkey.wk_rxkeyix; 1712 if (keyix < nt->nt_keyixmax && 1713 nt->nt_keyixmap[keyix] == ni) { 1714 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1715 "%s: %p<%s> clear key map entry", __func__, 1716 ni, ether_sprintf(ni->ni_macaddr)); 1717 nt->nt_keyixmap[keyix] = NULL; 1718 ieee80211_node_decref(ni); /* XXX needed? */ 1719 _ieee80211_free_node(ni); 1720 } 1721 } 1722 IEEE80211_NODE_UNLOCK(nt); 1723 } else { 1724 if (ieee80211_node_dectestref(ni)) 1725 _ieee80211_free_node(ni); 1726 } 1727 } 1728 1729 /* 1730 * Reclaim a unicast key and clear any key cache state. 1731 */ 1732 int 1733 ieee80211_node_delucastkey(struct ieee80211_node *ni) 1734 { 1735 struct ieee80211com *ic = ni->ni_ic; 1736 struct ieee80211_node_table *nt = &ic->ic_sta; 1737 struct ieee80211_node *nikey; 1738 ieee80211_keyix keyix; 1739 int isowned, status; 1740 1741 /* 1742 * NB: We must beware of LOR here; deleting the key 1743 * can cause the crypto layer to block traffic updates 1744 * which can generate a LOR against the node table lock; 1745 * grab it here and stash the key index for our use below. 1746 * 1747 * Must also beware of recursion on the node table lock. 1748 * When called from node_cleanup we may already have 1749 * the node table lock held. Unfortunately there's no 1750 * way to separate out this path so we must do this 1751 * conditionally. 1752 */ 1753 isowned = IEEE80211_NODE_IS_LOCKED(nt); 1754 if (!isowned) 1755 IEEE80211_NODE_LOCK(nt); 1756 keyix = ni->ni_ucastkey.wk_rxkeyix; 1757 status = ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 1758 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) { 1759 nikey = nt->nt_keyixmap[keyix]; 1760 nt->nt_keyixmap[keyix] = NULL;; 1761 } else 1762 nikey = NULL; 1763 if (!isowned) 1764 IEEE80211_NODE_UNLOCK(&ic->ic_sta); 1765 1766 if (nikey != NULL) { 1767 IASSERT(nikey == ni, 1768 ("key map out of sync, ni %p nikey %p", ni, nikey)); 1769 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1770 "%s: delete key map entry %p<%s> refcnt %d\n", 1771 __func__, ni, ether_sprintf(ni->ni_macaddr), 1772 ieee80211_node_refcnt(ni)-1); 1773 ieee80211_free_node(ni); 1774 } 1775 return status; 1776 } 1777 1778 /* 1779 * Reclaim a node. If this is the last reference count then 1780 * do the normal free work. Otherwise remove it from the node 1781 * table and mark it gone by clearing the back-reference. 1782 */ 1783 static void 1784 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1785 { 1786 ieee80211_keyix keyix; 1787 1788 IEEE80211_NODE_LOCK_ASSERT(nt); 1789 1790 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1791 "%s: remove %p<%s> from %s table, refcnt %d\n", 1792 __func__, ni, ether_sprintf(ni->ni_macaddr), 1793 nt->nt_name, ieee80211_node_refcnt(ni)-1); 1794 /* 1795 * Clear any entry in the unicast key mapping table. 1796 * We need to do it here so rx lookups don't find it 1797 * in the mapping table even if it's not in the hash 1798 * table. We cannot depend on the mapping table entry 1799 * being cleared because the node may not be free'd. 1800 */ 1801 keyix = ni->ni_ucastkey.wk_rxkeyix; 1802 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax && 1803 nt->nt_keyixmap[keyix] == ni) { 1804 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1805 "%s: %p<%s> clear key map entry\n", 1806 __func__, ni, ether_sprintf(ni->ni_macaddr)); 1807 nt->nt_keyixmap[keyix] = NULL; 1808 ieee80211_node_decref(ni); /* NB: don't need free */ 1809 } 1810 if (!ieee80211_node_dectestref(ni)) { 1811 /* 1812 * Other references are present, just remove the 1813 * node from the table so it cannot be found. When 1814 * the references are dropped storage will be 1815 * reclaimed. 1816 */ 1817 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1818 LIST_REMOVE(ni, ni_hash); 1819 ni->ni_table = NULL; /* clear reference */ 1820 } else 1821 _ieee80211_free_node(ni); 1822 } 1823 1824 static void 1825 ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1826 { 1827 struct ieee80211com *ic = nt->nt_ic; 1828 struct ieee80211_node *ni; 1829 1830 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1831 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1832 1833 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1834 if (ni->ni_associd != 0) { 1835 if (ic->ic_auth->ia_node_leave != NULL) 1836 ic->ic_auth->ia_node_leave(ic, ni); 1837 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1838 } 1839 node_reclaim(nt, ni); 1840 } 1841 ieee80211_reset_erp(ic); 1842 } 1843 1844 static void 1845 ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1846 { 1847 1848 IEEE80211_NODE_LOCK(nt); 1849 ieee80211_free_allnodes_locked(nt); 1850 IEEE80211_NODE_UNLOCK(nt); 1851 } 1852 1853 /* 1854 * Timeout entries in the scan cache. 1855 */ 1856 static void 1857 ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1858 { 1859 struct ieee80211com *ic = nt->nt_ic; 1860 struct ieee80211_node *ni, *tni; 1861 1862 IEEE80211_NODE_LOCK(nt); 1863 ni = ic->ic_bss; 1864 /* XXX belongs elsewhere */ 1865 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1866 m_freem(ni->ni_rxfrag[0]); 1867 ni->ni_rxfrag[0] = NULL; 1868 } 1869 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1870 if (ni->ni_inact && --ni->ni_inact == 0) { 1871 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1872 "[%s] scan candidate purged from cache " 1873 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1874 ieee80211_node_refcnt(ni)); 1875 node_reclaim(nt, ni); 1876 } 1877 } 1878 IEEE80211_NODE_UNLOCK(nt); 1879 1880 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1881 } 1882 1883 /* 1884 * Timeout inactive stations and do related housekeeping. 1885 * Note that we cannot hold the node lock while sending a 1886 * frame as this would lead to a LOR. Instead we use a 1887 * generation number to mark nodes that we've scanned and 1888 * drop the lock and restart a scan if we have to time out 1889 * a node. Since we are single-threaded by virtue of 1890 * controlling the inactivity timer we can be sure this will 1891 * process each node only once. 1892 */ 1893 static void 1894 ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1895 { 1896 struct ieee80211com *ic = nt->nt_ic; 1897 struct ieee80211_node *ni; 1898 u_int gen; 1899 int isadhoc; 1900 1901 isadhoc = (ic->ic_opmode == IEEE80211_M_IBSS || 1902 ic->ic_opmode == IEEE80211_M_AHDEMO); 1903 IEEE80211_SCAN_LOCK(nt); 1904 gen = ++nt->nt_scangen; 1905 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1906 "%s: %s scangen %u\n", __func__, nt->nt_name, gen); 1907 restart: 1908 IEEE80211_NODE_LOCK(nt); 1909 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1910 if (ni->ni_scangen == gen) /* previously handled */ 1911 continue; 1912 ni->ni_scangen = gen; 1913 /* 1914 * Ignore entries for which have yet to receive an 1915 * authentication frame. These are transient and 1916 * will be reclaimed when the last reference to them 1917 * goes away (when frame xmits complete). 1918 */ 1919 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1920 (ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1921 continue; 1922 /* 1923 * Free fragment if not needed anymore 1924 * (last fragment older than 1s). 1925 * XXX doesn't belong here 1926 */ 1927 if (ni->ni_rxfrag[0] != NULL && 1928 ticks > ni->ni_rxfragstamp + hz) { 1929 m_freem(ni->ni_rxfrag[0]); 1930 ni->ni_rxfrag[0] = NULL; 1931 } 1932 /* 1933 * Special case ourself; we may be idle for extended periods 1934 * of time and regardless reclaiming our state is wrong. 1935 */ 1936 if (ni == ic->ic_bss) 1937 continue; 1938 ni->ni_inact--; 1939 if (ni->ni_associd != 0 || isadhoc) { 1940 /* 1941 * Age frames on the power save queue. The 1942 * aging interval is 4 times the listen 1943 * interval specified by the station. This 1944 * number is factored into the age calculations 1945 * when the frame is placed on the queue. We 1946 * store ages as time differences we can check 1947 * and/or adjust only the head of the list. 1948 */ 1949 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1950 struct mbuf *m; 1951 int discard = 0; 1952 1953 IEEE80211_NODE_SAVEQ_LOCK(ni); 1954 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1955 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1956 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1957 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1958 m_freem(m); 1959 discard++; 1960 } 1961 if (m != NULL) 1962 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1963 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1964 1965 if (discard != 0) { 1966 IEEE80211_DPRINTF(ic, 1967 IEEE80211_MSG_POWER, 1968 "[%s] discard %u frames for age\n", 1969 ether_sprintf(ni->ni_macaddr), 1970 discard); 1971 IEEE80211_NODE_STAT_ADD(ni, 1972 ps_discard, discard); 1973 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1974 ic->ic_set_tim(ni, 0); 1975 } 1976 } 1977 /* 1978 * Probe the station before time it out. We 1979 * send a null data frame which may not be 1980 * universally supported by drivers (need it 1981 * for ps-poll support so it should be...). 1982 */ 1983 if (0 < ni->ni_inact && 1984 ni->ni_inact <= ic->ic_inact_probe) { 1985 IEEE80211_NOTE(ic, 1986 IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, 1987 ni, "%s", 1988 "probe station due to inactivity"); 1989 /* 1990 * Grab a reference before unlocking the table 1991 * so the node cannot be reclaimed before we 1992 * send the frame. ieee80211_send_nulldata 1993 * understands we've done this and reclaims the 1994 * ref for us as needed. 1995 */ 1996 ieee80211_ref_node(ni); 1997 IEEE80211_NODE_UNLOCK(nt); 1998 ieee80211_send_nulldata(ni); 1999 /* XXX stat? */ 2000 goto restart; 2001 } 2002 } 2003 if (ni->ni_inact <= 0) { 2004 IEEE80211_NOTE(ic, 2005 IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni, 2006 "station timed out due to inactivity " 2007 "(refcnt %u)", ieee80211_node_refcnt(ni)); 2008 /* 2009 * Send a deauthenticate frame and drop the station. 2010 * This is somewhat complicated due to reference counts 2011 * and locking. At this point a station will typically 2012 * have a reference count of 1. ieee80211_node_leave 2013 * will do a "free" of the node which will drop the 2014 * reference count. But in the meantime a reference 2015 * will be held by the deauth frame. The actual reclaim 2016 * of the node will happen either after the tx is 2017 * completed or by ieee80211_node_leave. 2018 * 2019 * Separately we must drop the node lock before sending 2020 * in case the driver takes a lock, as this will result 2021 * in LOR between the node lock and the driver lock. 2022 */ 2023 IEEE80211_NODE_UNLOCK(nt); 2024 if (ni->ni_associd != 0) { 2025 IEEE80211_SEND_MGMT(ic, ni, 2026 IEEE80211_FC0_SUBTYPE_DEAUTH, 2027 IEEE80211_REASON_AUTH_EXPIRE); 2028 } 2029 ieee80211_node_leave(ic, ni); 2030 ic->ic_stats.is_node_timeout++; 2031 goto restart; 2032 } 2033 } 2034 IEEE80211_NODE_UNLOCK(nt); 2035 2036 IEEE80211_SCAN_UNLOCK(nt); 2037 2038 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 2039 } 2040 2041 void 2042 ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 2043 { 2044 struct ieee80211_node *ni; 2045 u_int gen; 2046 2047 IEEE80211_SCAN_LOCK(nt); 2048 gen = ++nt->nt_scangen; 2049 restart: 2050 IEEE80211_NODE_LOCK(nt); 2051 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 2052 if (ni->ni_scangen != gen) { 2053 ni->ni_scangen = gen; 2054 (void) ieee80211_ref_node(ni); 2055 IEEE80211_NODE_UNLOCK(nt); 2056 (*f)(arg, ni); 2057 ieee80211_free_node(ni); 2058 goto restart; 2059 } 2060 } 2061 IEEE80211_NODE_UNLOCK(nt); 2062 2063 IEEE80211_SCAN_UNLOCK(nt); 2064 } 2065 2066 void 2067 ieee80211_dump_node(struct ieee80211_node_table *nt, 2068 struct ieee80211_node *ni) 2069 { 2070 printf("0x%p: mac %s refcnt %d\n", ni, 2071 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 2072 printf("\tscangen %u authmode %u flags 0x%x\n", 2073 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 2074 printf("\tassocid 0x%x txpower %u vlan %u\n", 2075 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 2076 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 2077 ni->ni_txseqs[0], 2078 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 2079 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 2080 ni->ni_rxfragstamp); 2081 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 2082 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 2083 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 2084 ether_sprintf(ni->ni_bssid), 2085 ni->ni_esslen, ni->ni_essid, 2086 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 2087 printf("\tfails %u inact %u txrate %u\n", 2088 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 2089 } 2090 2091 void 2092 ieee80211_dump_nodes(struct ieee80211_node_table *nt) 2093 { 2094 ieee80211_iterate_nodes(nt, 2095 (ieee80211_iter_func *) ieee80211_dump_node, nt); 2096 } 2097 2098 /* 2099 * Handle a station joining an 11g network. 2100 */ 2101 static void 2102 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 2103 { 2104 2105 /* 2106 * Station isn't capable of short slot time. Bump 2107 * the count of long slot time stations and disable 2108 * use of short slot time. Note that the actual switch 2109 * over to long slot time use may not occur until the 2110 * next beacon transmission (per sec. 7.3.1.4 of 11g). 2111 */ 2112 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 2113 ic->ic_longslotsta++; 2114 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2115 "[%s] station needs long slot time, count %d\n", 2116 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 2117 /* XXX vap's w/ conflicting needs won't work */ 2118 ieee80211_set_shortslottime(ic, 0); 2119 } 2120 /* 2121 * If the new station is not an ERP station 2122 * then bump the counter and enable protection 2123 * if configured. 2124 */ 2125 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 2126 ic->ic_nonerpsta++; 2127 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2128 "[%s] station is !ERP, %d non-ERP stations associated\n", 2129 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 2130 /* 2131 * If protection is configured, enable it. 2132 */ 2133 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 2134 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2135 "%s: enable use of protection\n", __func__); 2136 ic->ic_flags |= IEEE80211_F_USEPROT; 2137 } 2138 /* 2139 * If station does not support short preamble 2140 * then we must enable use of Barker preamble. 2141 */ 2142 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 2143 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2144 "[%s] station needs long preamble\n", 2145 ether_sprintf(ni->ni_macaddr)); 2146 ic->ic_flags |= IEEE80211_F_USEBARKER; 2147 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 2148 } 2149 } else 2150 ni->ni_flags |= IEEE80211_NODE_ERP; 2151 } 2152 2153 void 2154 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 2155 { 2156 int newassoc; 2157 2158 if (ni->ni_associd == 0) { 2159 u_int16_t aid; 2160 2161 /* 2162 * It would be good to search the bitmap 2163 * more efficiently, but this will do for now. 2164 */ 2165 for (aid = 1; aid < ic->ic_max_aid; aid++) { 2166 if (!IEEE80211_AID_ISSET(aid, 2167 ic->ic_aid_bitmap)) 2168 break; 2169 } 2170 if (aid >= ic->ic_max_aid) { 2171 IEEE80211_SEND_MGMT(ic, ni, resp, 2172 IEEE80211_REASON_ASSOC_TOOMANY); 2173 ieee80211_node_leave(ic, ni); 2174 return; 2175 } 2176 ni->ni_associd = aid | 0xc000; 2177 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 2178 ic->ic_sta_assoc++; 2179 newassoc = 1; 2180 if (ic->ic_curmode == IEEE80211_MODE_11G) 2181 ieee80211_node_join_11g(ic, ni); 2182 } else 2183 newassoc = 0; 2184 2185 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 2186 "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n", 2187 ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re", 2188 IEEE80211_NODE_AID(ni), 2189 ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long", 2190 ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long", 2191 ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "", 2192 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 2193 ); 2194 2195 /* give driver a chance to setup state like ni_txrate */ 2196 if (ic->ic_newassoc != NULL) 2197 ic->ic_newassoc(ni, newassoc); 2198 ni->ni_inact_reload = ic->ic_inact_auth; 2199 ni->ni_inact = ni->ni_inact_reload; 2200 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 2201 /* tell the authenticator about new station */ 2202 if (ic->ic_auth->ia_node_join != NULL) 2203 ic->ic_auth->ia_node_join(ic, ni); 2204 ieee80211_notify_node_join(ic, ni, newassoc); 2205 } 2206 2207 /* 2208 * Handle a station leaving an 11g network. 2209 */ 2210 static void 2211 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 2212 { 2213 2214 IASSERT(ic->ic_curmode == IEEE80211_MODE_11G, 2215 ("not in 11g, bss %u:0x%x, curmode %u", ni->ni_chan->ic_freq, 2216 ni->ni_chan->ic_flags, ic->ic_curmode)); 2217 2218 /* 2219 * If a long slot station do the slot time bookkeeping. 2220 */ 2221 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 2222 IASSERT(ic->ic_longslotsta > 0, 2223 ("bogus long slot station count %d", ic->ic_longslotsta)); 2224 ic->ic_longslotsta--; 2225 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2226 "[%s] long slot time station leaves, count now %d\n", 2227 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 2228 if (ic->ic_longslotsta == 0) { 2229 /* 2230 * Re-enable use of short slot time if supported 2231 * and not operating in IBSS mode (per spec). 2232 */ 2233 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 2234 ic->ic_opmode != IEEE80211_M_IBSS) { 2235 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2236 "%s: re-enable use of short slot time\n", 2237 __func__); 2238 ieee80211_set_shortslottime(ic, 1); 2239 } 2240 } 2241 } 2242 /* 2243 * If a non-ERP station do the protection-related bookkeeping. 2244 */ 2245 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 2246 IASSERT(ic->ic_nonerpsta > 0, 2247 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 2248 ic->ic_nonerpsta--; 2249 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2250 "[%s] non-ERP station leaves, count now %d\n", 2251 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 2252 if (ic->ic_nonerpsta == 0) { 2253 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2254 "%s: disable use of protection\n", __func__); 2255 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2256 /* XXX verify mode? */ 2257 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 2258 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2259 "%s: re-enable use of short preamble\n", 2260 __func__); 2261 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 2262 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 2263 } 2264 } 2265 } 2266 } 2267 2268 /* 2269 * Handle bookkeeping for station deauthentication/disassociation 2270 * when operating as an ap. 2271 */ 2272 void 2273 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 2274 { 2275 struct ieee80211_node_table *nt = ni->ni_table; 2276 2277 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 2278 "[%s] station with aid %d leaves\n", 2279 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 2280 2281 IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 2282 ic->ic_opmode == IEEE80211_M_IBSS || 2283 ic->ic_opmode == IEEE80211_M_AHDEMO, 2284 ("unexpected operating mode %u", ic->ic_opmode)); 2285 /* 2286 * If node wasn't previously associated all 2287 * we need to do is reclaim the reference. 2288 */ 2289 /* XXX ibss mode bypasses 11g and notification */ 2290 if (ni->ni_associd == 0) 2291 goto done; 2292 /* 2293 * Tell the authenticator the station is leaving. 2294 * Note that we must do this before yanking the 2295 * association id as the authenticator uses the 2296 * associd to locate it's state block. 2297 */ 2298 if (ic->ic_auth->ia_node_leave != NULL) 2299 ic->ic_auth->ia_node_leave(ic, ni); 2300 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 2301 ni->ni_associd = 0; 2302 ic->ic_sta_assoc--; 2303 2304 if (ic->ic_curmode == IEEE80211_MODE_11G) 2305 ieee80211_node_leave_11g(ic, ni); 2306 /* 2307 * Cleanup station state. In particular clear various 2308 * state that might otherwise be reused if the node 2309 * is reused before the reference count goes to zero 2310 * (and memory is reclaimed). 2311 */ 2312 ieee80211_sta_leave(ic, ni); 2313 done: 2314 /* 2315 * Remove the node from any table it's recorded in and 2316 * drop the caller's reference. Removal from the table 2317 * is important to insure the node is not reprocessed 2318 * for inactivity. 2319 */ 2320 if (nt != NULL) { 2321 IEEE80211_NODE_LOCK(nt); 2322 node_reclaim(nt, ni); 2323 IEEE80211_NODE_UNLOCK(nt); 2324 } else 2325 ieee80211_free_node(ni); 2326 } 2327 2328 u_int8_t 2329 ieee80211_getrssi(struct ieee80211com *ic) 2330 { 2331 #define NZ(x) ((x) == 0 ? 1 : (x)) 2332 struct ieee80211_node_table *nt = &ic->ic_sta; 2333 u_int32_t rssi_samples, rssi_total; 2334 struct ieee80211_node *ni; 2335 2336 rssi_total = 0; 2337 rssi_samples = 0; 2338 switch (ic->ic_opmode) { 2339 case IEEE80211_M_IBSS: /* average of all ibss neighbors */ 2340 /* XXX locking */ 2341 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) 2342 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 2343 rssi_samples++; 2344 rssi_total += ic->ic_node_getrssi(ni); 2345 } 2346 break; 2347 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 2348 /* XXX locking */ 2349 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 2350 rssi_samples++; 2351 rssi_total += ic->ic_node_getrssi(ni); 2352 } 2353 break; 2354 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 2355 #ifndef IEEE80211_NO_HOSTAP 2356 /* XXX locking */ 2357 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) 2358 if (IEEE80211_AID(ni->ni_associd) != 0) { 2359 rssi_samples++; 2360 rssi_total += ic->ic_node_getrssi(ni); 2361 } 2362 #endif /* !IEEE80211_NO_HOSTAP */ 2363 break; 2364 case IEEE80211_M_MONITOR: /* XXX */ 2365 case IEEE80211_M_STA: /* use stats from associated ap */ 2366 default: 2367 if (ic->ic_bss != NULL) 2368 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 2369 rssi_samples = 1; 2370 break; 2371 } 2372 return rssi_total / NZ(rssi_samples); 2373 #undef NZ 2374 } 2375 2376 /* 2377 * Indicate whether there are frames queued for a station in power-save mode. 2378 */ 2379 static void 2380 ieee80211_set_tim(struct ieee80211_node *ni, int set) 2381 { 2382 struct ieee80211com *ic = ni->ni_ic; 2383 u_int16_t aid; 2384 2385 IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 2386 ic->ic_opmode == IEEE80211_M_IBSS, 2387 ("operating mode %u", ic->ic_opmode)); 2388 2389 aid = IEEE80211_AID(ni->ni_associd); 2390 IASSERT(aid < ic->ic_max_aid, 2391 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 2392 2393 IEEE80211_BEACON_LOCK(ic); 2394 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 2395 if (set) { 2396 setbit(ic->ic_tim_bitmap, aid); 2397 ic->ic_ps_pending++; 2398 } else { 2399 clrbit(ic->ic_tim_bitmap, aid); 2400 ic->ic_ps_pending--; 2401 } 2402 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 2403 } 2404 IEEE80211_BEACON_UNLOCK(ic); 2405 } 2406 2407 /* 2408 * Node table support. 2409 */ 2410 2411 static void 2412 ieee80211_node_table_init(struct ieee80211com *ic, 2413 struct ieee80211_node_table *nt, 2414 const char *name, int inact, int keyixmax, 2415 void (*timeout)(struct ieee80211_node_table *)) 2416 { 2417 2418 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 2419 "%s %s table, inact %u\n", __func__, name, inact); 2420 2421 nt->nt_ic = ic; 2422 /* XXX need unit */ 2423 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 2424 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 2425 TAILQ_INIT(&nt->nt_node); 2426 nt->nt_name = name; 2427 nt->nt_scangen = 1; 2428 nt->nt_inact_init = inact; 2429 nt->nt_timeout = timeout; 2430 nt->nt_keyixmax = keyixmax; 2431 if (nt->nt_keyixmax > 0) { 2432 nt->nt_keyixmap = malloc(keyixmax * 2433 sizeof(struct ieee80211_node *), M_80211_NODE, 2434 M_NOWAIT | M_ZERO); 2435 if (nt->nt_keyixmap == NULL) 2436 if_printf(ic->ic_ifp, 2437 "Cannot allocate key index map with %u entries\n", 2438 keyixmax); 2439 } else 2440 nt->nt_keyixmap = NULL; 2441 } 2442 2443 void 2444 ieee80211_node_table_reset(struct ieee80211_node_table *nt) 2445 { 2446 2447 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 2448 "%s %s table\n", __func__, nt->nt_name); 2449 2450 IEEE80211_NODE_LOCK(nt); 2451 nt->nt_inact_timer = 0; 2452 ieee80211_free_allnodes_locked(nt); 2453 IEEE80211_NODE_UNLOCK(nt); 2454 } 2455 2456 static void 2457 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 2458 { 2459 2460 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 2461 "%s %s table\n", __func__, nt->nt_name); 2462 2463 IEEE80211_NODE_LOCK(nt); 2464 ieee80211_free_allnodes_locked(nt); 2465 IEEE80211_NODE_UNLOCK(nt); 2466 if (nt->nt_keyixmap != NULL) { 2467 /* XXX verify all entries are NULL */ 2468 int i; 2469 for (i = 0; i < nt->nt_keyixmax; i++) 2470 if (nt->nt_keyixmap[i] != NULL) 2471 printf("%s: %s[%u] still active\n", __func__, 2472 nt->nt_name, i); 2473 FREE(nt->nt_keyixmap, M_80211_NODE); 2474 nt->nt_keyixmap = NULL; 2475 } 2476 IEEE80211_SCAN_LOCK_DESTROY(nt); 2477 IEEE80211_NODE_LOCK_DESTROY(nt); 2478 } 2479