ieee80211_node.c revision 119150
1116742Ssam/*- 2116904Ssam * Copyright (c) 2001 Atsushi Onoe 3116742Ssam * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 4116742Ssam * All rights reserved. 5116742Ssam * 6116742Ssam * Redistribution and use in source and binary forms, with or without 7116742Ssam * modification, are permitted provided that the following conditions 8116742Ssam * are met: 9116742Ssam * 1. Redistributions of source code must retain the above copyright 10116904Ssam * notice, this list of conditions and the following disclaimer. 11116904Ssam * 2. Redistributions in binary form must reproduce the above copyright 12116904Ssam * notice, this list of conditions and the following disclaimer in the 13116904Ssam * documentation and/or other materials provided with the distribution. 14116904Ssam * 3. The name of the author may not be used to endorse or promote products 15116904Ssam * derived from this software without specific prior written permission. 16116742Ssam * 17116742Ssam * Alternatively, this software may be distributed under the terms of the 18116742Ssam * GNU General Public License ("GPL") version 2 as published by the Free 19116742Ssam * Software Foundation. 20116742Ssam * 21116904Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22116904Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23116904Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24116904Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25116904Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26116904Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27116904Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28116904Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29116904Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30116904Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31116742Ssam */ 32116742Ssam 33116742Ssam#include <sys/cdefs.h> 34116742Ssam__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_node.c 119150 2003-08-19 22:17:04Z sam $"); 35116742Ssam 36116742Ssam#include "opt_inet.h" 37116742Ssam 38116742Ssam#include <sys/param.h> 39116742Ssam#include <sys/systm.h> 40116742Ssam#include <sys/mbuf.h> 41116742Ssam#include <sys/malloc.h> 42116742Ssam#include <sys/kernel.h> 43116742Ssam#include <sys/socket.h> 44116742Ssam#include <sys/sockio.h> 45116742Ssam#include <sys/endian.h> 46116742Ssam#include <sys/errno.h> 47116742Ssam#include <sys/bus.h> 48116742Ssam#include <sys/proc.h> 49116742Ssam#include <sys/sysctl.h> 50116742Ssam 51116742Ssam#include <machine/atomic.h> 52116742Ssam 53116742Ssam#include <net/if.h> 54116742Ssam#include <net/if_dl.h> 55116742Ssam#include <net/if_media.h> 56116742Ssam#include <net/if_arp.h> 57116742Ssam#include <net/ethernet.h> 58116742Ssam#include <net/if_llc.h> 59116742Ssam 60116742Ssam#include <net80211/ieee80211_var.h> 61116742Ssam 62116742Ssam#include <net/bpf.h> 63116742Ssam 64116742Ssam#ifdef INET 65116742Ssam#include <netinet/in.h> 66116742Ssam#include <netinet/if_ether.h> 67116742Ssam#endif 68116742Ssam 69116742Ssamstatic struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); 70116742Ssamstatic void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); 71116742Ssamstatic void ieee80211_node_copy(struct ieee80211com *, 72116742Ssam struct ieee80211_node *, const struct ieee80211_node *); 73116742Ssamstatic void ieee80211_setup_node(struct ieee80211com *ic, 74116742Ssam struct ieee80211_node *ni, u_int8_t *macaddr); 75116742Ssamstatic void _ieee80211_free_node(struct ieee80211com *, 76116742Ssam struct ieee80211_node *); 77116742Ssam 78116742Ssamvoid 79116742Ssamieee80211_node_attach(struct ifnet *ifp) 80116742Ssam{ 81116742Ssam struct ieee80211com *ic = (void *)ifp; 82116742Ssam 83116742Ssam /* XXX need unit */ 84116742Ssam mtx_init(&ic->ic_nodelock, ifp->if_name, "802.11 node table", MTX_DEF); 85116742Ssam TAILQ_INIT(&ic->ic_node); 86116742Ssam ic->ic_node_alloc = ieee80211_node_alloc; 87116742Ssam ic->ic_node_free = ieee80211_node_free; 88116742Ssam ic->ic_node_copy = ieee80211_node_copy; 89118887Ssam} 90118887Ssam 91118887Ssamvoid 92118887Ssamieee80211_node_lateattach(struct ifnet *ifp) 93118887Ssam{ 94118887Ssam struct ieee80211com *ic = (void *)ifp; 95118887Ssam 96116742Ssam ic->ic_bss = (*ic->ic_node_alloc)(ic); 97117041Ssam KASSERT(ic->ic_bss != NULL, ("unable to setup inital BSS node")); 98117041Ssam ic->ic_bss->ni_chan = IEEE80211_CHAN_ANYC; 99116742Ssam} 100116742Ssam 101116742Ssamvoid 102116742Ssamieee80211_node_detach(struct ifnet *ifp) 103116742Ssam{ 104116742Ssam struct ieee80211com *ic = (void *)ifp; 105116742Ssam 106116742Ssam if (ic->ic_bss != NULL) 107116742Ssam (*ic->ic_node_free)(ic, ic->ic_bss); 108116742Ssam ieee80211_free_allnodes(ic); 109116742Ssam mtx_destroy(&ic->ic_nodelock); 110116742Ssam} 111116742Ssam 112116742Ssam/* 113116742Ssam * AP scanning support. 114116742Ssam */ 115116742Ssam 116116742Ssam/* 117116742Ssam * Initialize the active channel set based on the set 118116742Ssam * of available channels and the current PHY mode. 119116742Ssam */ 120117811Ssamstatic void 121116742Ssamieee80211_reset_scan(struct ifnet *ifp) 122116742Ssam{ 123116742Ssam struct ieee80211com *ic = (void *)ifp; 124116742Ssam 125116742Ssam memcpy(ic->ic_chan_scan, ic->ic_chan_active, 126116742Ssam sizeof(ic->ic_chan_active)); 127117811Ssam /* NB: hack, setup so next_scan starts with the first channel */ 128117811Ssam if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 129117811Ssam ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 130116742Ssam} 131116742Ssam 132116742Ssam/* 133116742Ssam * Begin an active scan. 134116742Ssam */ 135116742Ssamvoid 136117811Ssamieee80211_begin_scan(struct ifnet *ifp) 137116742Ssam{ 138116742Ssam struct ieee80211com *ic = (void *)ifp; 139116742Ssam 140117811Ssam /* 141117811Ssam * In all but hostap mode scanning starts off in 142117811Ssam * an active mode before switching to passive. 143117811Ssam */ 144117811Ssam if (ic->ic_opmode != IEEE80211_M_HOSTAP) 145117811Ssam ic->ic_flags |= IEEE80211_F_ASCAN; 146116742Ssam if (ifp->if_flags & IFF_DEBUG) 147116742Ssam if_printf(ifp, "begin %s scan\n", 148117811Ssam (ic->ic_flags & IEEE80211_F_ASCAN) ? 149116742Ssam "active" : "passive"); 150116742Ssam /* 151117811Ssam * Clear scan state and flush any previously seen 152117811Ssam * AP's. Note that the latter assumes we don't act 153117811Ssam * as both an AP and a station, otherwise we'll 154117811Ssam * potentially flush state of stations associated 155117811Ssam * with us. 156116742Ssam */ 157117811Ssam ieee80211_reset_scan(ifp); 158116742Ssam ieee80211_free_allnodes(ic); 159116742Ssam 160117811Ssam /* Scan the next channel. */ 161117811Ssam ieee80211_next_scan(ifp); 162116742Ssam} 163116742Ssam 164116742Ssam/* 165116742Ssam * Switch to the next channel marked for scanning. 166116742Ssam */ 167116742Ssamvoid 168116742Ssamieee80211_next_scan(struct ifnet *ifp) 169116742Ssam{ 170116742Ssam struct ieee80211com *ic = (void *)ifp; 171116742Ssam struct ieee80211_channel *chan; 172116742Ssam 173116742Ssam chan = ic->ic_bss->ni_chan; 174116742Ssam for (;;) { 175116742Ssam if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 176116742Ssam chan = &ic->ic_channels[0]; 177116742Ssam if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 178116742Ssam /* 179116742Ssam * Honor channels marked passive-only 180116742Ssam * during an active scan. 181116742Ssam */ 182116742Ssam if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 183116742Ssam (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 184116742Ssam break; 185116742Ssam } 186116742Ssam if (chan == ic->ic_bss->ni_chan) { 187116742Ssam ieee80211_end_scan(ifp); 188116742Ssam return; 189116742Ssam } 190116742Ssam } 191116742Ssam clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 192116742Ssam IEEE80211_DPRINTF(("ieee80211_next_scan: chan %d->%d\n", 193116742Ssam ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 194116742Ssam ieee80211_chan2ieee(ic, chan))); 195116742Ssam ic->ic_bss->ni_chan = chan; 196117811Ssam ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 197116742Ssam} 198116742Ssam 199116742Ssamvoid 200116742Ssamieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 201116742Ssam{ 202116742Ssam struct ieee80211_node *ni; 203116742Ssam struct ifnet *ifp = &ic->ic_if; 204116742Ssam 205116742Ssam ni = ic->ic_bss; 206116742Ssam if (ifp->if_flags & IFF_DEBUG) 207116742Ssam if_printf(ifp, "creating ibss\n"); 208116742Ssam ic->ic_flags |= IEEE80211_F_SIBSS; 209116742Ssam ni->ni_chan = chan; 210116742Ssam ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 211116742Ssam IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 212116742Ssam IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 213116742Ssam if (ic->ic_opmode == IEEE80211_M_IBSS) 214116742Ssam ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 215116742Ssam ni->ni_esslen = ic->ic_des_esslen; 216116742Ssam memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 217116742Ssam ni->ni_rssi = 0; 218116742Ssam ni->ni_rstamp = 0; 219116742Ssam memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 220116742Ssam ni->ni_intval = ic->ic_lintval; 221116742Ssam ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 222116742Ssam if (ic->ic_flags & IEEE80211_F_WEPON) 223116742Ssam ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 224116742Ssam if (ic->ic_phytype == IEEE80211_T_FH) { 225116742Ssam ni->ni_fhdwell = 200; /* XXX */ 226116742Ssam ni->ni_fhindex = 1; 227116742Ssam } 228117811Ssam ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 229116742Ssam} 230116742Ssam 231116742Ssam/* 232116742Ssam * Complete a scan of potential channels. 233116742Ssam */ 234116742Ssamvoid 235116742Ssamieee80211_end_scan(struct ifnet *ifp) 236116742Ssam{ 237116742Ssam struct ieee80211com *ic = (void *)ifp; 238116742Ssam struct ieee80211_node *ni, *nextbs, *selbs; 239116742Ssam u_int8_t rate; 240116742Ssam int i, fail; 241116742Ssam 242116742Ssam ic->ic_flags &= ~IEEE80211_F_ASCAN; 243116742Ssam ni = TAILQ_FIRST(&ic->ic_node); 244116742Ssam 245116742Ssam if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 246116742Ssam /* XXX off stack? */ 247116742Ssam u_char occupied[roundup(IEEE80211_CHAN_MAX, NBBY)]; 248116742Ssam /* 249116742Ssam * The passive scan to look for existing AP's completed, 250116742Ssam * select a channel to camp on. Identify the channels 251116742Ssam * that already have one or more AP's and try to locate 252116742Ssam * an unnoccupied one. If that fails, pick a random 253116742Ssam * channel from the active set. 254116742Ssam */ 255116742Ssam for (; ni != NULL; ni = nextbs) { 256116742Ssam ieee80211_ref_node(ni); 257116742Ssam nextbs = TAILQ_NEXT(ni, ni_list); 258116742Ssam setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 259116742Ssam ieee80211_free_node(ic, ni); 260116742Ssam } 261116742Ssam for (i = 0; i < IEEE80211_CHAN_MAX; i++) 262116742Ssam if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 263116742Ssam break; 264116742Ssam if (i == IEEE80211_CHAN_MAX) { 265116742Ssam fail = arc4random() & 3; /* random 0-3 */ 266116742Ssam for (i = 0; i < IEEE80211_CHAN_MAX; i++) 267116742Ssam if (isset(ic->ic_chan_active, i) && fail-- == 0) 268116742Ssam break; 269116742Ssam } 270116742Ssam ieee80211_create_ibss(ic, &ic->ic_channels[i]); 271116742Ssam return; 272116742Ssam } 273116742Ssam if (ni == NULL) { 274116742Ssam IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__)); 275116742Ssam notfound: 276116742Ssam if (ic->ic_opmode == IEEE80211_M_IBSS && 277116742Ssam (ic->ic_flags & IEEE80211_F_IBSSON) && 278116742Ssam ic->ic_des_esslen != 0) { 279116742Ssam ieee80211_create_ibss(ic, ic->ic_ibss_chan); 280116742Ssam return; 281116742Ssam } 282116742Ssam /* 283116742Ssam * Reset the list of channels to scan and start again. 284116742Ssam */ 285116742Ssam ieee80211_reset_scan(ifp); 286116742Ssam ieee80211_next_scan(ifp); 287116742Ssam return; 288116742Ssam } 289116742Ssam selbs = NULL; 290116742Ssam if (ifp->if_flags & IFF_DEBUG) 291119150Ssam if_printf(ifp, "\tmacaddr bssid chan rssi rate flag wep essid\n"); 292116742Ssam for (; ni != NULL; ni = nextbs) { 293116742Ssam ieee80211_ref_node(ni); 294116742Ssam nextbs = TAILQ_NEXT(ni, ni_list); 295116742Ssam if (ni->ni_fails) { 296116742Ssam /* 297116742Ssam * The configuration of the access points may change 298116742Ssam * during my scan. So delete the entry for the AP 299116742Ssam * and retry to associate if there is another beacon. 300116742Ssam */ 301116742Ssam if (ni->ni_fails++ > 2) 302116742Ssam ieee80211_free_node(ic, ni); 303116742Ssam continue; 304116742Ssam } 305116742Ssam fail = 0; 306116742Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 307116742Ssam fail |= 0x01; 308116742Ssam if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 309116742Ssam ni->ni_chan != ic->ic_des_chan) 310116742Ssam fail |= 0x01; 311116742Ssam if (ic->ic_opmode == IEEE80211_M_IBSS) { 312116742Ssam if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 313116742Ssam fail |= 0x02; 314116742Ssam } else { 315116742Ssam if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 316116742Ssam fail |= 0x02; 317116742Ssam } 318116742Ssam if (ic->ic_flags & IEEE80211_F_WEPON) { 319116742Ssam if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 320116742Ssam fail |= 0x04; 321116742Ssam } else { 322116742Ssam if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 323116742Ssam fail |= 0x04; 324116742Ssam } 325116742Ssam rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 326116742Ssam if (rate & IEEE80211_RATE_BASIC) 327116742Ssam fail |= 0x08; 328116742Ssam if (ic->ic_des_esslen != 0 && 329116742Ssam (ni->ni_esslen != ic->ic_des_esslen || 330116742Ssam memcmp(ni->ni_essid, ic->ic_des_essid, 331116742Ssam ic->ic_des_esslen != 0))) 332116742Ssam fail |= 0x10; 333116742Ssam if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 334116742Ssam !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 335116742Ssam fail |= 0x20; 336116742Ssam if (ifp->if_flags & IFF_DEBUG) { 337116742Ssam printf(" %c %s", fail ? '-' : '+', 338116742Ssam ether_sprintf(ni->ni_macaddr)); 339116742Ssam printf(" %s%c", ether_sprintf(ni->ni_bssid), 340116742Ssam fail & 0x20 ? '!' : ' '); 341116742Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 342116742Ssam fail & 0x01 ? '!' : ' '); 343116742Ssam printf(" %+4d", ni->ni_rssi); 344116742Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 345116742Ssam fail & 0x08 ? '!' : ' '); 346116742Ssam printf(" %4s%c", 347116742Ssam (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 348116742Ssam (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 349116742Ssam "????", 350116742Ssam fail & 0x02 ? '!' : ' '); 351116742Ssam printf(" %3s%c ", 352116742Ssam (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 353116742Ssam "wep" : "no", 354116742Ssam fail & 0x04 ? '!' : ' '); 355116742Ssam ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 356116742Ssam printf("%s\n", fail & 0x10 ? "!" : ""); 357116742Ssam } 358116742Ssam if (!fail) { 359116742Ssam if (selbs == NULL) 360116742Ssam selbs = ni; 361116742Ssam else if (ni->ni_rssi > selbs->ni_rssi) { 362116742Ssam ieee80211_unref_node(&selbs); 363116742Ssam selbs = ni; 364116742Ssam } else 365116742Ssam ieee80211_unref_node(&ni); 366116742Ssam } else { 367116742Ssam ieee80211_unref_node(&ni); 368116742Ssam } 369116742Ssam } 370116742Ssam if (selbs == NULL) 371116742Ssam goto notfound; 372116742Ssam (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 373116742Ssam if (ic->ic_opmode == IEEE80211_M_IBSS) { 374116742Ssam ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE | 375116742Ssam IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 376116742Ssam if (ic->ic_bss->ni_rates.rs_nrates == 0) { 377116742Ssam selbs->ni_fails++; 378116742Ssam ieee80211_unref_node(&selbs); 379116742Ssam goto notfound; 380116742Ssam } 381116742Ssam ieee80211_unref_node(&selbs); 382117811Ssam ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 383116742Ssam } else { 384116742Ssam ieee80211_unref_node(&selbs); 385117811Ssam ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 386116742Ssam } 387116742Ssam} 388116742Ssam 389116742Ssamstatic struct ieee80211_node * 390116742Ssamieee80211_node_alloc(struct ieee80211com *ic) 391116742Ssam{ 392116742Ssam return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 393116742Ssam M_NOWAIT | M_ZERO); 394116742Ssam} 395116742Ssam 396116742Ssamstatic void 397116742Ssamieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 398116742Ssam{ 399116742Ssam free(ni, M_DEVBUF); 400116742Ssam} 401116742Ssam 402116742Ssamstatic void 403116742Ssamieee80211_node_copy(struct ieee80211com *ic, 404116742Ssam struct ieee80211_node *dst, const struct ieee80211_node *src) 405116742Ssam{ 406116742Ssam *dst = *src; 407116742Ssam} 408116742Ssam 409116742Ssamstatic void 410116742Ssamieee80211_setup_node(struct ieee80211com *ic, 411116742Ssam struct ieee80211_node *ni, u_int8_t *macaddr) 412116742Ssam{ 413116742Ssam int hash; 414116742Ssam 415116742Ssam IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 416116742Ssam hash = IEEE80211_NODE_HASH(macaddr); 417116742Ssam ni->ni_refcnt = 1; /* mark referenced */ 418116742Ssam mtx_lock(&ic->ic_nodelock); 419116742Ssam TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list); 420116742Ssam LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash); 421116742Ssam /* 422116742Ssam * Note we don't enable the inactive timer when acting 423116742Ssam * as a station. Nodes created in this mode represent 424116742Ssam * AP's identified while scanning. If we time them out 425116742Ssam * then several things happen: we can't return the data 426116742Ssam * to users to show the list of AP's we encountered, and 427116742Ssam * more importantly, we'll incorrectly deauthenticate 428116742Ssam * ourself because the inactivity timer will kick us off. 429116742Ssam */ 430116742Ssam if (ic->ic_opmode != IEEE80211_M_STA) 431116742Ssam ic->ic_inact_timer = IEEE80211_INACT_WAIT; 432116742Ssam mtx_unlock(&ic->ic_nodelock); 433116742Ssam} 434116742Ssam 435116742Ssamstruct ieee80211_node * 436116742Ssamieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr) 437116742Ssam{ 438116742Ssam struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 439116742Ssam if (ni != NULL) 440116742Ssam ieee80211_setup_node(ic, ni, macaddr); 441116742Ssam return ni; 442116742Ssam} 443116742Ssam 444116742Ssamstruct ieee80211_node * 445116742Ssamieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr) 446116742Ssam{ 447116742Ssam struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 448116742Ssam if (ni != NULL) { 449116742Ssam memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node)); 450116742Ssam ieee80211_setup_node(ic, ni, macaddr); 451116742Ssam } 452116742Ssam return ni; 453116742Ssam} 454116742Ssam 455116742Ssamstruct ieee80211_node * 456116742Ssamieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr) 457116742Ssam{ 458116742Ssam struct ieee80211_node *ni; 459116742Ssam int hash; 460116742Ssam 461116742Ssam hash = IEEE80211_NODE_HASH(macaddr); 462116742Ssam mtx_lock(&ic->ic_nodelock); 463116742Ssam LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 464116742Ssam if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 465116742Ssam atomic_add_int(&ni->ni_refcnt, 1); /* mark referenced */ 466116742Ssam break; 467116742Ssam } 468116742Ssam } 469116742Ssam mtx_unlock(&ic->ic_nodelock); 470116742Ssam return ni; 471116742Ssam} 472116742Ssam 473116742Ssam/* 474116742Ssam * Like find but search based on the channel too. 475116742Ssam */ 476116742Ssamstruct ieee80211_node * 477116742Ssamieee80211_lookup_node(struct ieee80211com *ic, 478116742Ssam u_int8_t *macaddr, struct ieee80211_channel *chan) 479116742Ssam{ 480116742Ssam struct ieee80211_node *ni; 481116742Ssam int hash; 482116742Ssam 483116742Ssam hash = IEEE80211_NODE_HASH(macaddr); 484116742Ssam mtx_lock(&ic->ic_nodelock); 485116742Ssam LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 486116742Ssam if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { 487116742Ssam atomic_add_int(&ni->ni_refcnt, 1);/* mark referenced */ 488116742Ssam break; 489116742Ssam } 490116742Ssam } 491116742Ssam mtx_unlock(&ic->ic_nodelock); 492116742Ssam return ni; 493116742Ssam} 494116742Ssam 495116742Ssamstatic void 496116742Ssam_ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 497116742Ssam{ 498119150Ssam KASSERT(ni != ic->ic_bss, ("freeing bss node")); 499119150Ssam 500116742Ssam TAILQ_REMOVE(&ic->ic_node, ni, ni_list); 501116742Ssam LIST_REMOVE(ni, ni_hash); 502116742Ssam if (TAILQ_EMPTY(&ic->ic_node)) 503116742Ssam ic->ic_inact_timer = 0; 504116742Ssam (*ic->ic_node_free)(ic, ni); 505116742Ssam} 506116742Ssam 507116742Ssamvoid 508116742Ssamieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 509116742Ssam{ 510119150Ssam KASSERT(ni != ic->ic_bss, ("freeing ic_bss")); 511119150Ssam 512116742Ssam /* XXX need equivalent of atomic_dec_and_test */ 513116742Ssam atomic_subtract_int(&ni->ni_refcnt, 1); 514116742Ssam if (atomic_cmpset_int(&ni->ni_refcnt, 0, 1)) { 515116742Ssam mtx_lock(&ic->ic_nodelock); 516116742Ssam _ieee80211_free_node(ic, ni); 517116742Ssam mtx_unlock(&ic->ic_nodelock); 518116742Ssam } 519116742Ssam} 520116742Ssam 521116742Ssamvoid 522116742Ssamieee80211_free_allnodes(struct ieee80211com *ic) 523116742Ssam{ 524116742Ssam struct ieee80211_node *ni; 525116742Ssam 526116742Ssam mtx_lock(&ic->ic_nodelock); 527116742Ssam while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL) 528116742Ssam _ieee80211_free_node(ic, ni); 529116742Ssam mtx_unlock(&ic->ic_nodelock); 530116742Ssam} 531116742Ssam 532116742Ssamvoid 533116742Ssamieee80211_timeout_nodes(struct ieee80211com *ic) 534116742Ssam{ 535116742Ssam struct ieee80211_node *ni, *nextbs; 536116742Ssam 537116742Ssam mtx_lock(&ic->ic_nodelock); 538116742Ssam for (ni = TAILQ_FIRST(&ic->ic_node); ni != NULL;) { 539119150Ssam if (++ni->ni_inact > IEEE80211_INACT_MAX) { 540119150Ssam IEEE80211_DPRINTF(("station %s timed out " 541116742Ssam "due to inactivity (%u secs)\n", 542116742Ssam ether_sprintf(ni->ni_macaddr), 543116742Ssam ni->ni_inact)); 544119150Ssam nextbs = TAILQ_NEXT(ni, ni_list); 545119150Ssam /* 546119150Ssam * Send a deauthenticate frame. 547119150Ssam */ 548119150Ssam IEEE80211_SEND_MGMT(ic, ni, 549119150Ssam IEEE80211_FC0_SUBTYPE_DEAUTH, 550119150Ssam IEEE80211_REASON_AUTH_EXPIRE); 551119150Ssam ieee80211_free_node(ic, ni); 552119150Ssam ni = nextbs; 553119150Ssam } else 554119150Ssam ni = TAILQ_NEXT(ni, ni_list); 555116742Ssam } 556116742Ssam if (!TAILQ_EMPTY(&ic->ic_node)) 557116742Ssam ic->ic_inact_timer = IEEE80211_INACT_WAIT; 558116742Ssam mtx_unlock(&ic->ic_nodelock); 559116742Ssam} 560116742Ssam 561116742Ssamvoid 562116742Ssamieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) 563116742Ssam{ 564116742Ssam struct ieee80211_node *ni; 565116742Ssam 566116742Ssam mtx_lock(&ic->ic_nodelock); 567116742Ssam TAILQ_FOREACH(ni, &ic->ic_node, ni_list) 568116742Ssam (*f)(arg, ni); 569116742Ssam mtx_unlock(&ic->ic_nodelock); 570116742Ssam} 571