ieee80211_scan_sta.c revision 186904
1170530Ssam/*- 2186904Ssam * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3170530Ssam * All rights reserved. 4170530Ssam * 5170530Ssam * Redistribution and use in source and binary forms, with or without 6170530Ssam * modification, are permitted provided that the following conditions 7170530Ssam * are met: 8170530Ssam * 1. Redistributions of source code must retain the above copyright 9170530Ssam * notice, this list of conditions and the following disclaimer. 10170530Ssam * 2. Redistributions in binary form must reproduce the above copyright 11170530Ssam * notice, this list of conditions and the following disclaimer in the 12170530Ssam * documentation and/or other materials provided with the distribution. 13170530Ssam * 14170530Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15170530Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16170530Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17170530Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18170530Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19170530Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20170530Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21170530Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22170530Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23170530Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24170530Ssam */ 25170530Ssam 26170530Ssam#include <sys/cdefs.h> 27170530Ssam__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_scan_sta.c 186904 2009-01-08 17:12:47Z sam $"); 28170530Ssam 29170530Ssam/* 30170530Ssam * IEEE 802.11 station scanning support. 31170530Ssam */ 32178354Ssam#include "opt_wlan.h" 33178354Ssam 34170530Ssam#include <sys/param.h> 35170530Ssam#include <sys/systm.h> 36170530Ssam#include <sys/kernel.h> 37170530Ssam#include <sys/module.h> 38170530Ssam 39170530Ssam#include <sys/socket.h> 40170530Ssam 41170530Ssam#include <net/if.h> 42170530Ssam#include <net/if_media.h> 43170530Ssam#include <net/ethernet.h> 44170530Ssam 45170530Ssam#include <net80211/ieee80211_var.h> 46178354Ssam#include <net80211/ieee80211_input.h> 47178354Ssam#include <net80211/ieee80211_regdomain.h> 48186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 49186904Ssam#include <net80211/ieee80211_tdma.h> 50186904Ssam#endif 51170530Ssam 52170530Ssam#include <net/bpf.h> 53170530Ssam 54170530Ssam/* 55170530Ssam * Parameters for managing cache entries: 56170530Ssam * 57170530Ssam * o a station with STA_FAILS_MAX failures is not considered 58170530Ssam * when picking a candidate 59170530Ssam * o a station that hasn't had an update in STA_PURGE_SCANS 60170530Ssam * (background) scans is discarded 61170530Ssam * o after STA_FAILS_AGE seconds we clear the failure count 62170530Ssam */ 63170530Ssam#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 64170530Ssam#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 65170530Ssam#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 66170530Ssam 67170530Ssam/* XXX tunable */ 68170530Ssam#define STA_RSSI_MIN 8 /* min acceptable rssi */ 69170530Ssam#define STA_RSSI_MAX 40 /* max rssi for comparison */ 70170530Ssam 71170530Ssamstruct sta_entry { 72170530Ssam struct ieee80211_scan_entry base; 73170530Ssam TAILQ_ENTRY(sta_entry) se_list; 74170530Ssam LIST_ENTRY(sta_entry) se_hash; 75170530Ssam uint8_t se_fails; /* failure to associate count */ 76170530Ssam uint8_t se_seen; /* seen during current scan */ 77170530Ssam uint8_t se_notseen; /* not seen in previous scans */ 78170530Ssam uint8_t se_flags; 79184302Ssam#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 80170530Ssam uint32_t se_avgrssi; /* LPF rssi state */ 81170530Ssam unsigned long se_lastupdate; /* time of last update */ 82170530Ssam unsigned long se_lastfail; /* time of last failure */ 83170530Ssam unsigned long se_lastassoc; /* time of last association */ 84170530Ssam u_int se_scangen; /* iterator scan gen# */ 85178354Ssam u_int se_countrygen; /* gen# of last cc notify */ 86170530Ssam}; 87170530Ssam 88170530Ssam#define STA_HASHSIZE 32 89170530Ssam/* simple hash is enough for variation of macaddr */ 90170530Ssam#define STA_HASH(addr) \ 91170530Ssam (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 92170530Ssam 93186107Ssam#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 94186107SsamCTASSERT(MAX_IEEE_CHAN >= 256); 95186107Ssam 96170530Ssamstruct sta_table { 97170530Ssam struct mtx st_lock; /* on scan table */ 98170530Ssam TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 99170530Ssam LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 100178354Ssam struct mtx st_scanlock; /* on st_scaniter */ 101178354Ssam u_int st_scaniter; /* gen# for iterator */ 102178354Ssam u_int st_scangen; /* scan generation # */ 103170530Ssam int st_newscan; 104178354Ssam /* ap-related state */ 105186107Ssam int st_maxrssi[MAX_IEEE_CHAN]; 106170530Ssam}; 107170530Ssam 108170530Ssamstatic void sta_flush_table(struct sta_table *); 109171409Ssam/* 110171409Ssam * match_bss returns a bitmask describing if an entry is suitable 111171409Ssam * for use. If non-zero the entry was deemed not suitable and it's 112171409Ssam * contents explains why. The following flags are or'd to to this 113171409Ssam * mask and can be used to figure out why the entry was rejected. 114171409Ssam */ 115184302Ssam#define MATCH_CHANNEL 0x0001 /* channel mismatch */ 116184302Ssam#define MATCH_CAPINFO 0x0002 /* capabilities mismatch, e.g. no ess */ 117184302Ssam#define MATCH_PRIVACY 0x0004 /* privacy mismatch */ 118184302Ssam#define MATCH_RATE 0x0008 /* rate set mismatch */ 119184302Ssam#define MATCH_SSID 0x0010 /* ssid mismatch */ 120184302Ssam#define MATCH_BSSID 0x0020 /* bssid mismatch */ 121184302Ssam#define MATCH_FAILS 0x0040 /* too many failed auth attempts */ 122184302Ssam#define MATCH_NOTSEEN 0x0080 /* not seen in recent scans */ 123184302Ssam#define MATCH_RSSI 0x0100 /* rssi deemed too low to use */ 124184302Ssam#define MATCH_CC 0x0200 /* country code mismatch */ 125186904Ssam#define MATCH_TDMA_NOIE 0x0400 /* no TDMA ie */ 126186904Ssam#define MATCH_TDMA_NOTMASTER 0x0800 /* not TDMA master */ 127186904Ssam#define MATCH_TDMA_NOSLOT 0x1000 /* all TDMA slots occupied */ 128186904Ssam#define MATCH_TDMA_LOCAL 0x2000 /* local address */ 129178354Ssamstatic int match_bss(struct ieee80211vap *, 130170530Ssam const struct ieee80211_scan_state *, struct sta_entry *, int); 131178354Ssamstatic void adhoc_age(struct ieee80211_scan_state *); 132170530Ssam 133178354Ssamstatic __inline int 134178354Ssamisocmp(const uint8_t cc1[], const uint8_t cc2[]) 135178354Ssam{ 136178354Ssam return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 137178354Ssam} 138178354Ssam 139170530Ssam/* number of references from net80211 layer */ 140170530Ssamstatic int nrefs = 0; 141170530Ssam 142170530Ssam/* 143170530Ssam * Attach prior to any scanning work. 144170530Ssam */ 145170530Ssamstatic int 146170530Ssamsta_attach(struct ieee80211_scan_state *ss) 147170530Ssam{ 148170530Ssam struct sta_table *st; 149170530Ssam 150186302Ssam st = (struct sta_table *) malloc(sizeof(struct sta_table), 151170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 152170530Ssam if (st == NULL) 153170530Ssam return 0; 154170530Ssam mtx_init(&st->st_lock, "scantable", "802.11 scan table", MTX_DEF); 155170530Ssam mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 156170530Ssam TAILQ_INIT(&st->st_entry); 157170530Ssam ss->ss_priv = st; 158170530Ssam nrefs++; /* NB: we assume caller locking */ 159170530Ssam return 1; 160170530Ssam} 161170530Ssam 162170530Ssam/* 163170530Ssam * Cleanup any private state. 164170530Ssam */ 165170530Ssamstatic int 166170530Ssamsta_detach(struct ieee80211_scan_state *ss) 167170530Ssam{ 168170530Ssam struct sta_table *st = ss->ss_priv; 169170530Ssam 170170530Ssam if (st != NULL) { 171170530Ssam sta_flush_table(st); 172170530Ssam mtx_destroy(&st->st_lock); 173170530Ssam mtx_destroy(&st->st_scanlock); 174186302Ssam free(st, M_80211_SCAN); 175170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 176170530Ssam nrefs--; /* NB: we assume caller locking */ 177170530Ssam } 178170530Ssam return 1; 179170530Ssam} 180170530Ssam 181170530Ssam/* 182170530Ssam * Flush all per-scan state. 183170530Ssam */ 184170530Ssamstatic int 185170530Ssamsta_flush(struct ieee80211_scan_state *ss) 186170530Ssam{ 187170530Ssam struct sta_table *st = ss->ss_priv; 188170530Ssam 189170530Ssam mtx_lock(&st->st_lock); 190170530Ssam sta_flush_table(st); 191170530Ssam mtx_unlock(&st->st_lock); 192170530Ssam ss->ss_last = 0; 193170530Ssam return 0; 194170530Ssam} 195170530Ssam 196170530Ssam/* 197170530Ssam * Flush all entries in the scan cache. 198170530Ssam */ 199170530Ssamstatic void 200170530Ssamsta_flush_table(struct sta_table *st) 201170530Ssam{ 202170530Ssam struct sta_entry *se, *next; 203170530Ssam 204170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 205170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 206170530Ssam LIST_REMOVE(se, se_hash); 207178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 208186302Ssam free(se, M_80211_SCAN); 209170530Ssam } 210178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 211170530Ssam} 212170530Ssam 213170530Ssam/* 214170530Ssam * Process a beacon or probe response frame; create an 215170530Ssam * entry in the scan cache or update any previous entry. 216170530Ssam */ 217170530Ssamstatic int 218170530Ssamsta_add(struct ieee80211_scan_state *ss, 219170530Ssam const struct ieee80211_scanparams *sp, 220170530Ssam const struct ieee80211_frame *wh, 221170530Ssam int subtype, int rssi, int noise, int rstamp) 222170530Ssam{ 223170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 224170530Ssam#define PICK1ST(_ss) \ 225170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 226170530Ssam IEEE80211_SCAN_PICK1ST) 227170530Ssam struct sta_table *st = ss->ss_priv; 228170530Ssam const uint8_t *macaddr = wh->i_addr2; 229178354Ssam struct ieee80211vap *vap = ss->ss_vap; 230178354Ssam struct ieee80211com *ic = vap->iv_ic; 231170530Ssam struct sta_entry *se; 232170530Ssam struct ieee80211_scan_entry *ise; 233178354Ssam int hash; 234170530Ssam 235170530Ssam hash = STA_HASH(macaddr); 236170530Ssam 237170530Ssam mtx_lock(&st->st_lock); 238170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 239170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 240170530Ssam goto found; 241186302Ssam se = (struct sta_entry *) malloc(sizeof(struct sta_entry), 242170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 243170530Ssam if (se == NULL) { 244170530Ssam mtx_unlock(&st->st_lock); 245170530Ssam return 0; 246170530Ssam } 247178354Ssam se->se_scangen = st->st_scaniter-1; 248178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 249170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 250170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 251170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 252170530Ssamfound: 253170530Ssam ise = &se->base; 254170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 255170530Ssam if (sp->ssid[1] != 0 && 256170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 257170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 258170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 259170530Ssam ("rate set too large: %u", sp->rates[1])); 260170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 261170530Ssam if (sp->xrates != NULL) { 262170530Ssam /* XXX validate xrates[1] */ 263178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 264170530Ssam ("xrate set too large: %u", sp->xrates[1])); 265170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 266170530Ssam } else 267170530Ssam ise->se_xrates[1] = 0; 268170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 269178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 270173368Ssam /* 271173368Ssam * Record rssi data using extended precision LPF filter. 272173368Ssam * 273173368Ssam * NB: use only on-channel data to insure we get a good 274173368Ssam * estimate of the signal we'll see when associated. 275173368Ssam */ 276178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 277178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 278173368Ssam ise->se_noise = noise; 279173368Ssam } 280170530Ssam ise->se_rstamp = rstamp; 281170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 282170530Ssam ise->se_intval = sp->bintval; 283170530Ssam ise->se_capinfo = sp->capinfo; 284173368Ssam /* 285173368Ssam * Beware of overriding se_chan for frames seen 286173368Ssam * off-channel; this can cause us to attempt an 287178354Ssam * association on the wrong channel. 288173368Ssam */ 289178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 290173862Ssam struct ieee80211_channel *c; 291173368Ssam /* 292173862Ssam * Off-channel, locate the home/bss channel for the sta 293178354Ssam * using the value broadcast in the DSPARMS ie. We know 294178354Ssam * sp->chan has this value because it's used to calculate 295178354Ssam * IEEE80211_BPARSE_OFFCHAN. 296173368Ssam */ 297178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 298178354Ssam ic->ic_curchan->ic_flags); 299173956Ssam if (c != NULL) { 300173956Ssam ise->se_chan = c; 301173956Ssam } else if (ise->se_chan == NULL) { 302173862Ssam /* should not happen, pick something */ 303178354Ssam ise->se_chan = ic->ic_curchan; 304173862Ssam } 305173862Ssam } else 306178354Ssam ise->se_chan = ic->ic_curchan; 307170530Ssam ise->se_fhdwell = sp->fhdwell; 308170530Ssam ise->se_fhindex = sp->fhindex; 309170530Ssam ise->se_erp = sp->erp; 310170530Ssam ise->se_timoff = sp->timoff; 311170530Ssam if (sp->tim != NULL) { 312170530Ssam const struct ieee80211_tim_ie *tim = 313170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 314170530Ssam ise->se_dtimperiod = tim->tim_period; 315170530Ssam } 316178354Ssam if (sp->country != NULL) { 317178354Ssam const struct ieee80211_country_ie *cie = 318178354Ssam (const struct ieee80211_country_ie *) sp->country; 319178354Ssam /* 320178354Ssam * If 11d is enabled and we're attempting to join a bss 321178354Ssam * that advertises it's country code then compare our 322178354Ssam * current settings to what we fetched from the country ie. 323178354Ssam * If our country code is unspecified or different then 324178354Ssam * dispatch an event to user space that identifies the 325178354Ssam * country code so our regdomain config can be changed. 326178354Ssam */ 327178354Ssam /* XXX only for STA mode? */ 328178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 329178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 330178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 331178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 332178354Ssam /* only issue one notify event per scan */ 333178354Ssam if (se->se_countrygen != st->st_scangen) { 334178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 335178354Ssam cie->cc); 336178354Ssam se->se_countrygen = st->st_scangen; 337178354Ssam } 338178354Ssam } 339178354Ssam ise->se_cc[0] = cie->cc[0]; 340178354Ssam ise->se_cc[1] = cie->cc[1]; 341178354Ssam } 342178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 343178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 344170530Ssam 345170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 346170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 347170530Ssam se->se_fails = 0; 348178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 349170530Ssam "%s: fails %u", __func__, se->se_fails); 350170530Ssam } 351170530Ssam 352170530Ssam se->se_lastupdate = ticks; /* update time */ 353170530Ssam se->se_seen = 1; 354170530Ssam se->se_notseen = 0; 355170530Ssam 356186107Ssam KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 357178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 358178354Ssam st->st_maxrssi[sp->bchan] = rssi; 359178354Ssam 360170530Ssam mtx_unlock(&st->st_lock); 361170530Ssam 362170530Ssam /* 363170530Ssam * If looking for a quick choice and nothing's 364170530Ssam * been found check here. 365170530Ssam */ 366178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 367170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 368170530Ssam 369170530Ssam return 1; 370170530Ssam#undef PICK1ST 371170530Ssam#undef ISPROBE 372170530Ssam} 373170530Ssam 374170530Ssam/* 375170530Ssam * Check if a channel is excluded by user request. 376170530Ssam */ 377170530Ssamstatic int 378178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 379170530Ssam{ 380178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 381178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 382178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 383170530Ssam} 384170530Ssam 385170530Ssamstatic struct ieee80211_channel * 386170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 387170530Ssam{ 388170530Ssam struct ieee80211_channel *c; 389170530Ssam int j; 390170530Ssam 391170530Ssam /* 392170530Ssam * The normal ordering in the channel list is b channel 393170530Ssam * immediately followed by g so optimize the search for 394170530Ssam * this. We'll still do a full search just in case. 395170530Ssam */ 396170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 397170530Ssam c = &ic->ic_channels[j]; 398170530Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) 399170530Ssam return c; 400170530Ssam } 401170530Ssam for (j = 0; j < i; j++) { 402170530Ssam c = &ic->ic_channels[j]; 403170530Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) 404170530Ssam return c; 405170530Ssam } 406170530Ssam return NULL; 407170530Ssam} 408170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 409170530Ssam IEEE80211_CHAN_B, /* IEEE80211_MODE_AUTO */ 410170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 411170530Ssam IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 412170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_11G */ 413170530Ssam IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 414170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_TURBO_A (check base channel)*/ 415170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_TURBO_G */ 416170530Ssam IEEE80211_CHAN_ST, /* IEEE80211_MODE_STURBO_A */ 417170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_11NA (check legacy) */ 418170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_11NG (check legacy) */ 419170530Ssam}; 420170530Ssam 421170530Ssamstatic void 422178354Ssamadd_channels(struct ieee80211vap *vap, 423170530Ssam struct ieee80211_scan_state *ss, 424170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 425170530Ssam{ 426170530Ssam#define N(a) (sizeof(a) / sizeof(a[0])) 427178354Ssam struct ieee80211com *ic = vap->iv_ic; 428170530Ssam struct ieee80211_channel *c, *cg; 429170530Ssam u_int modeflags; 430170530Ssam int i; 431170530Ssam 432170530Ssam KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 433170530Ssam modeflags = chanflags[mode]; 434170530Ssam for (i = 0; i < nfreq; i++) { 435170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 436170530Ssam break; 437170530Ssam 438170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 439178354Ssam if (c == NULL || isexcluded(vap, c)) 440170530Ssam continue; 441170530Ssam if (mode == IEEE80211_MODE_AUTO) { 442170530Ssam /* 443170530Ssam * XXX special-case 11b/g channels so we select 444178354Ssam * the g channel if both are present. 445170530Ssam */ 446178354Ssam if (IEEE80211_IS_CHAN_B(c) && 447178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 448178354Ssam c = cg; 449170530Ssam } 450170530Ssam ss->ss_chans[ss->ss_last++] = c; 451170530Ssam } 452170530Ssam#undef N 453170530Ssam} 454170530Ssam 455170530Ssamstruct scanlist { 456170530Ssam uint16_t mode; 457170530Ssam uint16_t count; 458170530Ssam const uint16_t *list; 459170530Ssam}; 460170530Ssam 461170530Ssamstatic int 462170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 463170530Ssam{ 464170530Ssam int i; 465170530Ssam 466170530Ssam for (; scan->list != NULL; scan++) { 467170530Ssam for (i = 0; i < scan->count; i++) 468170530Ssam if (scan->list[i] == c->ic_freq) 469170530Ssam return 1; 470170530Ssam } 471170530Ssam return 0; 472170530Ssam} 473170530Ssam 474176653Ssamstatic void 475178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 476176653Ssam const struct scanlist table[]) 477176653Ssam{ 478178354Ssam struct ieee80211com *ic = vap->iv_ic; 479176653Ssam struct ieee80211_channel *c; 480176653Ssam int i; 481176653Ssam 482176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 483176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 484176653Ssam break; 485176653Ssam 486176653Ssam c = &ic->ic_channels[i]; 487176653Ssam /* 488176653Ssam * Ignore dynamic turbo channels; we scan them 489176653Ssam * in normal mode (i.e. not boosted). Likewise 490176653Ssam * for HT channels, they get scanned using 491176653Ssam * legacy rates. 492176653Ssam */ 493176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 494176653Ssam continue; 495176653Ssam 496176653Ssam /* 497176653Ssam * If a desired mode was specified, scan only 498176653Ssam * channels that satisfy that constraint. 499176653Ssam */ 500178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 501178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 502176653Ssam continue; 503176653Ssam 504176653Ssam /* 505176653Ssam * Skip channels excluded by user request. 506176653Ssam */ 507178354Ssam if (isexcluded(vap, c)) 508176653Ssam continue; 509176653Ssam 510176653Ssam /* 511176653Ssam * Add the channel unless it is listed in the 512176653Ssam * fixed scan order tables. This insures we 513176653Ssam * don't sweep back in channels we filtered out 514176653Ssam * above. 515176653Ssam */ 516176653Ssam if (checktable(table, c)) 517176653Ssam continue; 518176653Ssam 519176653Ssam /* Add channel to scanning list. */ 520176653Ssam ss->ss_chans[ss->ss_last++] = c; 521176653Ssam } 522176653Ssam} 523176653Ssam 524178354Ssamstatic void 525178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 526178354Ssam const struct scanlist table[]) 527170530Ssam{ 528170530Ssam const struct scanlist *scan; 529170530Ssam enum ieee80211_phymode mode; 530170530Ssam 531170530Ssam ss->ss_last = 0; 532170530Ssam /* 533170530Ssam * Use the table of ordered channels to construct the list 534170530Ssam * of channels for scanning. Any channels in the ordered 535170530Ssam * list not in the master list will be discarded. 536170530Ssam */ 537178354Ssam for (scan = table; scan->list != NULL; scan++) { 538170530Ssam mode = scan->mode; 539178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 540170530Ssam /* 541170530Ssam * If a desired mode was specified, scan only 542170530Ssam * channels that satisfy that constraint. 543170530Ssam */ 544178354Ssam if (vap->iv_des_mode != mode) { 545170530Ssam /* 546170530Ssam * The scan table marks 2.4Ghz channels as b 547170530Ssam * so if the desired mode is 11g, then use 548170530Ssam * the 11b channel list but upgrade the mode. 549170530Ssam */ 550178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_11G || 551170530Ssam mode != IEEE80211_MODE_11B) 552170530Ssam continue; 553170530Ssam mode = IEEE80211_MODE_11G; /* upgrade */ 554170530Ssam } 555170530Ssam } else { 556170530Ssam /* 557170530Ssam * This lets add_channels upgrade an 11b channel 558170530Ssam * to 11g if available. 559170530Ssam */ 560170530Ssam if (mode == IEEE80211_MODE_11B) 561170530Ssam mode = IEEE80211_MODE_AUTO; 562170530Ssam } 563170530Ssam#ifdef IEEE80211_F_XR 564170530Ssam /* XR does not operate on turbo channels */ 565178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 566170530Ssam (mode == IEEE80211_MODE_TURBO_A || 567170530Ssam mode == IEEE80211_MODE_TURBO_G || 568170530Ssam mode == IEEE80211_MODE_STURBO_A)) 569170530Ssam continue; 570170530Ssam#endif 571170530Ssam /* 572170530Ssam * Add the list of the channels; any that are not 573170530Ssam * in the master channel list will be discarded. 574170530Ssam */ 575178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 576170530Ssam } 577170530Ssam 578170530Ssam /* 579178354Ssam * Add the channels from the ic that are not present 580178354Ssam * in the table. 581170530Ssam */ 582178354Ssam sweepchannels(ss, vap, table); 583178354Ssam} 584170530Ssam 585178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 586178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 587178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 588178354Ssam{ 5170, 5190, 5210, 5230 }; 589178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 590178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 591178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 592178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 593178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 594178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 595178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 596178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 597178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 598178354Ssam{ 2484 }; 599178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 600178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 601178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 602178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 603178354Ssam#ifdef ATH_TURBO_SCAN 604178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 605178354Ssam{ 5210, 5250, 5290 }; 606178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 607178354Ssam{ 5760, 5800 }; 608178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 609178354Ssam{ 5540, 5580, 5620, 5660 }; 610178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 611178354Ssam{ 2437 }; 612178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 613178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 614178354Ssam#endif /* ATH_TURBO_SCAN */ 615170530Ssam 616178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 617170530Ssam 618178354Ssamstatic const struct scanlist staScanTable[] = { 619178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 620178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 621178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 622178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 623178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 624178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 625178354Ssam#ifdef ATH_TURBO_SCAN 626178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 627178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 628178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 629178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 630178354Ssam#endif /* ATH_TURBO_SCAN */ 631178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 632178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 633178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 634178354Ssam#ifdef ATH_TURBO_SCAN 635178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 636178354Ssam#endif /* ATH_TURBO_SCAN */ 637178354Ssam { .list = NULL } 638178354Ssam}; 639178354Ssam 640178354Ssam/* 641178354Ssam * Start a station-mode scan by populating the channel list. 642178354Ssam */ 643178354Ssamstatic int 644178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 645178354Ssam{ 646178354Ssam struct sta_table *st = ss->ss_priv; 647178354Ssam 648178354Ssam makescanlist(ss, vap, staScanTable); 649178354Ssam 650178354Ssam if (ss->ss_mindwell == 0) 651178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 652178354Ssam if (ss->ss_maxdwell == 0) 653178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 654178354Ssam 655178354Ssam st->st_scangen++; 656170530Ssam st->st_newscan = 1; 657170530Ssam 658170530Ssam return 0; 659170530Ssam} 660170530Ssam 661170530Ssam/* 662178354Ssam * Restart a scan, typically a bg scan but can 663178354Ssam * also be a fg scan that came up empty. 664170530Ssam */ 665170530Ssamstatic int 666178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 667170530Ssam{ 668170530Ssam struct sta_table *st = ss->ss_priv; 669170530Ssam 670170530Ssam st->st_newscan = 1; 671170530Ssam return 0; 672170530Ssam} 673170530Ssam 674170530Ssam/* 675170530Ssam * Cancel an ongoing scan. 676170530Ssam */ 677170530Ssamstatic int 678178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 679170530Ssam{ 680170530Ssam return 0; 681170530Ssam} 682170530Ssam 683178354Ssam/* unalligned little endian access */ 684178354Ssam#define LE_READ_2(p) \ 685178354Ssam ((uint16_t) \ 686178354Ssam ((((const uint8_t *)(p))[0] ) | \ 687178354Ssam (((const uint8_t *)(p))[1] << 8))) 688184302Ssam 689184302Ssam/* 690184302Ssam * Demote any supplied 11g channel to 11b. There should 691184302Ssam * always be an 11b channel but we check anyway... 692184302Ssam */ 693184302Ssamstatic struct ieee80211_channel * 694184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 695184302Ssam{ 696184302Ssam struct ieee80211_channel *c; 697178354Ssam 698184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 699184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 700184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 701184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 702184302Ssam IEEE80211_CHAN_B); 703184302Ssam if (c != NULL) 704184302Ssam chan = c; 705184302Ssam } 706184302Ssam return chan; 707184302Ssam} 708184302Ssam 709178354Ssamstatic int 710170530Ssammaxrate(const struct ieee80211_scan_entry *se) 711170530Ssam{ 712178354Ssam const struct ieee80211_ie_htcap *htcap = 713178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 714178354Ssam int rmax, r, i; 715178354Ssam uint16_t caps; 716170530Ssam 717170530Ssam rmax = 0; 718178354Ssam if (htcap != NULL) { 719178354Ssam /* 720178354Ssam * HT station; inspect supported MCS and then adjust 721178354Ssam * rate by channel width. Could also include short GI 722178354Ssam * in this if we want to be extra accurate. 723178354Ssam */ 724178354Ssam /* XXX assumes MCS15 is max */ 725178354Ssam for (i = 15; i >= 0 && isclr(htcap->hc_mcsset, i); i--) 726178354Ssam ; 727178354Ssam if (i >= 0) { 728178354Ssam caps = LE_READ_2(&htcap->hc_cap); 729178354Ssam /* XXX short/long GI */ 730178354Ssam if (caps & IEEE80211_HTCAP_CHWIDTH40) 731178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 732178354Ssam else 733178354Ssam rmax = ieee80211_htrates[i].ht40_rate_800ns; 734178354Ssam } 735178354Ssam } 736170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 737170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 738170530Ssam if (r > rmax) 739170530Ssam rmax = r; 740170530Ssam } 741170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 742170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 743170530Ssam if (r > rmax) 744170530Ssam rmax = r; 745170530Ssam } 746170530Ssam return rmax; 747170530Ssam} 748170530Ssam 749170530Ssam/* 750170530Ssam * Compare the capabilities of two entries and decide which is 751170530Ssam * more desirable (return >0 if a is considered better). Note 752170530Ssam * that we assume compatibility/usability has already been checked 753170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 754170530Ssam * Used to select the best scan candidate for association in a BSS. 755170530Ssam */ 756170530Ssamstatic int 757170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 758170530Ssam{ 759170530Ssam#define PREFER(_a,_b,_what) do { \ 760170530Ssam if (((_a) ^ (_b)) & (_what)) \ 761170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 762170530Ssam} while (0) 763178354Ssam int maxa, maxb; 764170530Ssam int8_t rssia, rssib; 765170530Ssam int weight; 766170530Ssam 767170530Ssam /* privacy support */ 768170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 769170530Ssam IEEE80211_CAPINFO_PRIVACY); 770170530Ssam 771170530Ssam /* compare count of previous failures */ 772170530Ssam weight = b->se_fails - a->se_fails; 773170530Ssam if (abs(weight) > 1) 774170530Ssam return weight; 775170530Ssam 776170530Ssam /* 777170530Ssam * Compare rssi. If the two are considered equivalent 778170530Ssam * then fallback to other criteria. We threshold the 779170530Ssam * comparisons to avoid selecting an ap purely by rssi 780170530Ssam * when both values may be good but one ap is otherwise 781170530Ssam * more desirable (e.g. an 11b-only ap with stronger 782170530Ssam * signal than an 11g ap). 783170530Ssam */ 784170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 785170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 786170530Ssam if (abs(rssib - rssia) < 5) { 787170530Ssam /* best/max rate preferred if signal level close enough XXX */ 788170530Ssam maxa = maxrate(&a->base); 789170530Ssam maxb = maxrate(&b->base); 790170530Ssam if (maxa != maxb) 791170530Ssam return maxa - maxb; 792170530Ssam /* XXX use freq for channel preference */ 793170530Ssam /* for now just prefer 5Ghz band to all other bands */ 794178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 795178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 796170530Ssam } 797170530Ssam /* all things being equal, use signal level */ 798170530Ssam return a->base.se_rssi - b->base.se_rssi; 799170530Ssam#undef PREFER 800170530Ssam} 801170530Ssam 802170530Ssam/* 803170530Ssam * Check rate set suitability and return the best supported rate. 804178354Ssam * XXX inspect MCS for HT 805170530Ssam */ 806170530Ssamstatic int 807184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 808184302Ssam const struct ieee80211_scan_entry *se) 809170530Ssam{ 810170530Ssam#define RV(v) ((v) & IEEE80211_RATE_VAL) 811170530Ssam const struct ieee80211_rateset *srs; 812178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 813170530Ssam const uint8_t *rs; 814170530Ssam 815178354Ssam okrate = badrate = 0; 816170530Ssam 817184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 818170530Ssam nrs = se->se_rates[1]; 819170530Ssam rs = se->se_rates+2; 820178354Ssam /* XXX MCS */ 821184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 822170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 823170530Ssamagain: 824170530Ssam for (i = 0; i < nrs; i++) { 825170530Ssam r = RV(rs[i]); 826170530Ssam badrate = r; 827170530Ssam /* 828170530Ssam * Check any fixed rate is included. 829170530Ssam */ 830178354Ssam if (r == ucastrate) 831170530Ssam fixedrate = r; 832170530Ssam /* 833170530Ssam * Check against our supported rates. 834170530Ssam */ 835170530Ssam for (j = 0; j < srs->rs_nrates; j++) 836170530Ssam if (r == RV(srs->rs_rates[j])) { 837170530Ssam if (r > okrate) /* NB: track max */ 838170530Ssam okrate = r; 839170530Ssam break; 840170530Ssam } 841170530Ssam 842170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 843170530Ssam /* 844170530Ssam * Don't try joining a BSS, if we don't support 845170530Ssam * one of its basic rates. 846170530Ssam */ 847170530Ssam okrate = 0; 848170530Ssam goto back; 849170530Ssam } 850170530Ssam } 851170530Ssam if (rs == se->se_rates+2) { 852170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 853170530Ssam nrs = se->se_xrates[1]; 854170530Ssam rs = se->se_xrates+2; 855170530Ssam goto again; 856170530Ssam } 857170530Ssam 858170530Ssamback: 859178354Ssam if (okrate == 0 || ucastrate != fixedrate) 860170530Ssam return badrate | IEEE80211_RATE_BASIC; 861170530Ssam else 862170530Ssam return RV(okrate); 863170530Ssam#undef RV 864170530Ssam} 865170530Ssam 866170530Ssamstatic int 867170530Ssammatch_ssid(const uint8_t *ie, 868170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 869170530Ssam{ 870170530Ssam int i; 871170530Ssam 872170530Ssam for (i = 0; i < nssid; i++) { 873170530Ssam if (ie[1] == ssids[i].len && 874170530Ssam memcmp(ie+2, ssids[i].ssid, ie[1]) == 0) 875170530Ssam return 1; 876170530Ssam } 877170530Ssam return 0; 878170530Ssam} 879170530Ssam 880186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 881186904Ssamstatic int 882186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 883186904Ssam{ 884186904Ssam int slot, slotcnt; 885186904Ssam 886186904Ssam slotcnt = tdma->tdma_slotcnt; 887186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 888186904Ssam if (isclr(tdma->tdma_inuse, slot)) 889186904Ssam return 0; 890186904Ssam return 1; 891186904Ssam} 892186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 893186904Ssam 894170530Ssam/* 895170530Ssam * Test a scan candidate for suitability/compatibility. 896170530Ssam */ 897170530Ssamstatic int 898178354Ssammatch_bss(struct ieee80211vap *vap, 899170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 900170530Ssam int debug) 901170530Ssam{ 902178354Ssam struct ieee80211com *ic = vap->iv_ic; 903170530Ssam struct ieee80211_scan_entry *se = &se0->base; 904178354Ssam uint8_t rate; 905178354Ssam int fail; 906170530Ssam 907170530Ssam fail = 0; 908170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 909171409Ssam fail |= MATCH_CHANNEL; 910170530Ssam /* 911170530Ssam * NB: normally the desired mode is used to construct 912170530Ssam * the channel list, but it's possible for the scan 913170530Ssam * cache to include entries for stations outside this 914170530Ssam * list so we check the desired mode here to weed them 915170530Ssam * out. 916170530Ssam */ 917178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 918170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 919178354Ssam chanflags[vap->iv_des_mode]) 920171409Ssam fail |= MATCH_CHANNEL; 921178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 922170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 923171409Ssam fail |= MATCH_CAPINFO; 924186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 925186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 926186904Ssam /* 927186904Ssam * Adhoc demo network setup shouldn't really be scanning 928186904Ssam * but just in case skip stations operating in IBSS or 929186904Ssam * BSS mode. 930186904Ssam */ 931186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 932186904Ssam fail |= MATCH_CAPINFO; 933186904Ssam /* 934186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 935186904Ssam * skip if IBSS or ESS capabilities are marked and require 936186904Ssam * the beacon have a TDMA ie present. 937186904Ssam */ 938186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 939186904Ssam const struct ieee80211_tdma_param *tdma = 940186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 941186904Ssam 942186904Ssam if (tdma == NULL) 943186904Ssam fail |= MATCH_TDMA_NOIE; 944186904Ssam else if (tdma->tdma_slot != 0) 945186904Ssam fail |= MATCH_TDMA_NOTMASTER; 946186904Ssam else if (tdma_isfull(tdma)) 947186904Ssam fail |= MATCH_TDMA_NOSLOT; 948186904Ssam#if 0 949186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 950186904Ssam fail |= MATCH_TDMA_LOCAL; 951186904Ssam#endif 952186904Ssam } 953186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 954170530Ssam } else { 955170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 956171409Ssam fail |= MATCH_CAPINFO; 957178354Ssam /* 958178354Ssam * If 11d is enabled and we're attempting to join a bss 959178354Ssam * that advertises it's country code then compare our 960178354Ssam * current settings to what we fetched from the country ie. 961178354Ssam * If our country code is unspecified or different then do 962178354Ssam * not attempt to join the bss. We should have already 963178354Ssam * dispatched an event to user space that identifies the 964178354Ssam * new country code so our regdomain config should match. 965178354Ssam */ 966178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 967178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 968178354Ssam se->se_cc[0] != 0 && 969178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 970178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 971178354Ssam fail |= MATCH_CC; 972170530Ssam } 973178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 974170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 975171409Ssam fail |= MATCH_PRIVACY; 976170530Ssam } else { 977170530Ssam /* XXX does this mean privacy is supported or required? */ 978170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 979171409Ssam fail |= MATCH_PRIVACY; 980170530Ssam } 981184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 982184302Ssam rate = check_rate(vap, se->se_chan, se); 983184302Ssam if (rate & IEEE80211_RATE_BASIC) { 984171409Ssam fail |= MATCH_RATE; 985184302Ssam /* 986184302Ssam * An 11b-only ap will give a rate mismatch if there is an 987184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 988184302Ssam * in the scan list to 11b and retry the rate check. 989184302Ssam */ 990184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 991184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 992184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 993184302Ssam fail &= ~MATCH_RATE; 994184302Ssam se0->se_flags |= STA_DEMOTE11B; 995184302Ssam } 996184302Ssam } 997184302Ssam } else if (rate < 2*24) { 998184302Ssam /* 999184302Ssam * This is an 11b-only ap. Check the desired mode in 1000184302Ssam * case that needs to be honored (mode 11g filters out 1001184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1002184302Ssam * in scanning to be demoted. 1003184302Ssam * 1004184302Ssam * NB: we cheat a bit here by looking at the max rate; 1005184302Ssam * we could/should check the rates. 1006184302Ssam */ 1007184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1008184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1009184302Ssam fail |= MATCH_RATE; 1010184302Ssam else 1011184302Ssam se0->se_flags |= STA_DEMOTE11B; 1012184302Ssam } 1013170530Ssam if (ss->ss_nssid != 0 && 1014171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1015171409Ssam fail |= MATCH_SSID; 1016178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1017178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1018178354Ssam fail |= MATCH_BSSID; 1019170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1020171409Ssam fail |= MATCH_FAILS; 1021170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1022171409Ssam fail |= MATCH_NOTSEEN; 1023170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1024171409Ssam fail |= MATCH_RSSI; 1025170530Ssam#ifdef IEEE80211_DEBUG 1026178354Ssam if (ieee80211_msg(vap, debug)) { 1027170530Ssam printf(" %c %s", 1028171409Ssam fail & MATCH_FAILS ? '=' : 1029171409Ssam fail & MATCH_NOTSEEN ? '^' : 1030178354Ssam fail & MATCH_CC ? '$' : 1031186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1032186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1033186904Ssam fail & MATCH_TDMA_NOTMASTER ? ':' : 1034186904Ssam fail & MATCH_TDMA_NOSLOT ? '@' : 1035186904Ssam fail & MATCH_TDMA_LOCAL ? '#' : 1036186904Ssam#endif 1037171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1038170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1039171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1040170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1041171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1042171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1043170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1044171409Ssam fail & MATCH_RATE ? '!' : ' '); 1045170530Ssam printf(" %4s%c", 1046170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1047170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 1048170530Ssam "????", 1049171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1050170530Ssam printf(" %3s%c ", 1051170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1052170530Ssam "wep" : "no", 1053171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1054170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1055171409Ssam printf("%s\n", fail & MATCH_SSID ? "!" : ""); 1056170530Ssam } 1057170530Ssam#endif 1058170530Ssam return fail; 1059170530Ssam} 1060170530Ssam 1061170530Ssamstatic void 1062170530Ssamsta_update_notseen(struct sta_table *st) 1063170530Ssam{ 1064170530Ssam struct sta_entry *se; 1065170530Ssam 1066170530Ssam mtx_lock(&st->st_lock); 1067170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1068170530Ssam /* 1069170530Ssam * If seen the reset and don't bump the count; 1070170530Ssam * otherwise bump the ``not seen'' count. Note 1071170530Ssam * that this insures that stations for which we 1072170530Ssam * see frames while not scanning but not during 1073170530Ssam * this scan will not be penalized. 1074170530Ssam */ 1075170530Ssam if (se->se_seen) 1076170530Ssam se->se_seen = 0; 1077170530Ssam else 1078170530Ssam se->se_notseen++; 1079170530Ssam } 1080170530Ssam mtx_unlock(&st->st_lock); 1081170530Ssam} 1082170530Ssam 1083170530Ssamstatic void 1084170530Ssamsta_dec_fails(struct sta_table *st) 1085170530Ssam{ 1086170530Ssam struct sta_entry *se; 1087170530Ssam 1088170530Ssam mtx_lock(&st->st_lock); 1089170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1090170530Ssam if (se->se_fails) 1091170530Ssam se->se_fails--; 1092170530Ssam mtx_unlock(&st->st_lock); 1093170530Ssam} 1094170530Ssam 1095170530Ssamstatic struct sta_entry * 1096178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1097170530Ssam{ 1098170530Ssam struct sta_table *st = ss->ss_priv; 1099170530Ssam struct sta_entry *se, *selbs = NULL; 1100170530Ssam 1101178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1102170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1103170530Ssam mtx_lock(&st->st_lock); 1104170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1105184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1106178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1107170530Ssam if (selbs == NULL) 1108170530Ssam selbs = se; 1109170530Ssam else if (sta_compare(se, selbs) > 0) 1110170530Ssam selbs = se; 1111170530Ssam } 1112170530Ssam } 1113170530Ssam mtx_unlock(&st->st_lock); 1114170530Ssam 1115170530Ssam return selbs; 1116170530Ssam} 1117170530Ssam 1118170530Ssam/* 1119170530Ssam * Pick an ap or ibss network to join or find a channel 1120170530Ssam * to use to start an ibss network. 1121170530Ssam */ 1122170530Ssamstatic int 1123178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1124170530Ssam{ 1125170530Ssam struct sta_table *st = ss->ss_priv; 1126170530Ssam struct sta_entry *selbs; 1127184274Ssam struct ieee80211_channel *chan; 1128170530Ssam 1129178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1130178354Ssam ("wrong mode %u", vap->iv_opmode)); 1131170530Ssam 1132170530Ssam if (st->st_newscan) { 1133170530Ssam sta_update_notseen(st); 1134170530Ssam st->st_newscan = 0; 1135170530Ssam } 1136170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1137170530Ssam /* 1138170530Ssam * Manual/background scan, don't select+join the 1139170530Ssam * bss, just return. The scanning framework will 1140170530Ssam * handle notification that this has completed. 1141170530Ssam */ 1142170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1143170530Ssam return 1; 1144170530Ssam } 1145170530Ssam /* 1146170530Ssam * Automatic sequencing; look for a candidate and 1147170530Ssam * if found join the network. 1148170530Ssam */ 1149170530Ssam /* NB: unlocked read should be ok */ 1150170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1151178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1152170530Ssam "%s: no scan candidate\n", __func__); 1153178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1154178354Ssam return 0; 1155170530Ssamnotfound: 1156170530Ssam /* 1157170530Ssam * If nothing suitable was found decrement 1158170530Ssam * the failure counts so entries will be 1159170530Ssam * reconsidered the next time around. We 1160170530Ssam * really want to do this only for sta's 1161170530Ssam * where we've previously had some success. 1162170530Ssam */ 1163170530Ssam sta_dec_fails(st); 1164170530Ssam st->st_newscan = 1; 1165170530Ssam return 0; /* restart scan */ 1166170530Ssam } 1167178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1168178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1169178354Ssam return (selbs != NULL); 1170184274Ssam if (selbs == NULL) 1171170530Ssam goto notfound; 1172184274Ssam chan = selbs->base.se_chan; 1173184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1174184302Ssam chan = demote11b(vap, chan); 1175184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1176184274Ssam goto notfound; 1177170530Ssam return 1; /* terminate scan */ 1178170530Ssam} 1179170530Ssam 1180170530Ssam/* 1181170530Ssam * Lookup an entry in the scan cache. We assume we're 1182170530Ssam * called from the bottom half or such that we don't need 1183170530Ssam * to block the bottom half so that it's safe to return 1184170530Ssam * a reference to an entry w/o holding the lock on the table. 1185170530Ssam */ 1186170530Ssamstatic struct sta_entry * 1187170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1188170530Ssam{ 1189170530Ssam struct sta_entry *se; 1190170530Ssam int hash = STA_HASH(macaddr); 1191170530Ssam 1192170530Ssam mtx_lock(&st->st_lock); 1193170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1194170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1195170530Ssam break; 1196170530Ssam mtx_unlock(&st->st_lock); 1197170530Ssam 1198170530Ssam return se; /* NB: unlocked */ 1199170530Ssam} 1200170530Ssam 1201170530Ssamstatic void 1202178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1203170530Ssam{ 1204178354Ssam struct ieee80211com *ic = vap->iv_ic; 1205178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1206170530Ssam struct sta_table *st = ss->ss_priv; 1207178354Ssam enum ieee80211_phymode mode; 1208170530Ssam struct sta_entry *se, *selbs; 1209178354Ssam uint8_t roamRate, curRate, ucastRate; 1210170530Ssam int8_t roamRssi, curRssi; 1211170530Ssam 1212170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1213170530Ssam if (se == NULL) { 1214170530Ssam /* XXX something is wrong */ 1215170530Ssam return; 1216170530Ssam } 1217170530Ssam 1218178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1219178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1220178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1221178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1222170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1223170530Ssam curRssi = ic->ic_node_getrssi(ni); 1224178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1225178354Ssam curRate = ni->ni_txrate; 1226178354Ssam roamRate &= IEEE80211_RATE_VAL; 1227178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1228170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1229170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1230170530Ssam } else { 1231170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1232178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1233170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1234170530Ssam } 1235170530Ssam /* 1236170530Ssam * Check if a new ap should be used and switch. 1237170530Ssam * XXX deauth current ap 1238170530Ssam */ 1239170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1240178354Ssam if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1241170530Ssam /* 1242170530Ssam * Scan cache contents are too old; force a scan now 1243170530Ssam * if possible so we have current state to make a 1244170530Ssam * decision with. We don't kick off a bg scan if 1245170530Ssam * we're using dynamic turbo and boosted or if the 1246170530Ssam * channel is busy. 1247170530Ssam * XXX force immediate switch on scan complete 1248170530Ssam */ 1249170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1250178354Ssam time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1251178354Ssam ieee80211_bg_scan(vap, 0); 1252170530Ssam return; 1253170530Ssam } 1254170530Ssam se->base.se_rssi = curRssi; 1255178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1256170530Ssam if (selbs != NULL && selbs != se) { 1257184274Ssam struct ieee80211_channel *chan; 1258184274Ssam 1259178354Ssam IEEE80211_DPRINTF(vap, 1260170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1261170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1262170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1263170530Ssam curRate, roamRate, curRssi, roamRssi); 1264184274Ssam 1265184274Ssam chan = selbs->base.se_chan; 1266184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1267184302Ssam chan = demote11b(vap, chan); 1268184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1269170530Ssam } 1270170530Ssam } 1271170530Ssam} 1272170530Ssam 1273170530Ssam/* 1274170530Ssam * Age entries in the scan cache. 1275170530Ssam * XXX also do roaming since it's convenient 1276170530Ssam */ 1277170530Ssamstatic void 1278170530Ssamsta_age(struct ieee80211_scan_state *ss) 1279170530Ssam{ 1280178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1281170530Ssam 1282178354Ssam adhoc_age(ss); 1283170530Ssam /* 1284170530Ssam * If rate control is enabled check periodically to see if 1285170530Ssam * we should roam from our current connection to one that 1286170530Ssam * might be better. This only applies when we're operating 1287170530Ssam * in sta mode and automatic roaming is set. 1288170530Ssam * XXX defer if busy 1289170530Ssam * XXX repeater station 1290170530Ssam * XXX do when !bgscan? 1291170530Ssam */ 1292178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1293178354Ssam ("wrong mode %u", vap->iv_opmode)); 1294178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1295178354Ssam (vap->iv_ic->ic_flags & IEEE80211_F_BGSCAN) && 1296178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1297170530Ssam /* XXX vap is implicit */ 1298178354Ssam sta_roam_check(ss, vap); 1299170530Ssam} 1300170530Ssam 1301170530Ssam/* 1302170530Ssam * Iterate over the entries in the scan cache, invoking 1303170530Ssam * the callback function on each one. 1304170530Ssam */ 1305170530Ssamstatic void 1306170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1307170530Ssam ieee80211_scan_iter_func *f, void *arg) 1308170530Ssam{ 1309170530Ssam struct sta_table *st = ss->ss_priv; 1310170530Ssam struct sta_entry *se; 1311170530Ssam u_int gen; 1312170530Ssam 1313170530Ssam mtx_lock(&st->st_scanlock); 1314178354Ssam gen = st->st_scaniter++; 1315170530Ssamrestart: 1316170530Ssam mtx_lock(&st->st_lock); 1317170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1318170530Ssam if (se->se_scangen != gen) { 1319170530Ssam se->se_scangen = gen; 1320170530Ssam /* update public state */ 1321170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1322170530Ssam mtx_unlock(&st->st_lock); 1323170530Ssam (*f)(arg, &se->base); 1324170530Ssam goto restart; 1325170530Ssam } 1326170530Ssam } 1327170530Ssam mtx_unlock(&st->st_lock); 1328170530Ssam 1329170530Ssam mtx_unlock(&st->st_scanlock); 1330170530Ssam} 1331170530Ssam 1332170530Ssamstatic void 1333170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1334170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1335170530Ssam{ 1336170530Ssam struct sta_table *st = ss->ss_priv; 1337170530Ssam struct sta_entry *se; 1338170530Ssam 1339170530Ssam se = sta_lookup(st, macaddr); 1340170530Ssam if (se != NULL) { 1341170530Ssam se->se_fails++; 1342170530Ssam se->se_lastfail = ticks; 1343178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1344170530Ssam macaddr, "%s: reason %u fails %u", 1345170530Ssam __func__, reason, se->se_fails); 1346170530Ssam } 1347170530Ssam} 1348170530Ssam 1349170530Ssamstatic void 1350170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1351170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1352170530Ssam{ 1353170530Ssam struct sta_table *st = ss->ss_priv; 1354170530Ssam struct sta_entry *se; 1355170530Ssam 1356170530Ssam se = sta_lookup(st, macaddr); 1357170530Ssam if (se != NULL) { 1358170530Ssam#if 0 1359170530Ssam se->se_fails = 0; 1360178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1361170530Ssam macaddr, "%s: fails %u", 1362170530Ssam __func__, se->se_fails); 1363170530Ssam#endif 1364170530Ssam se->se_lastassoc = ticks; 1365170530Ssam } 1366170530Ssam} 1367170530Ssam 1368170530Ssamstatic const struct ieee80211_scanner sta_default = { 1369170530Ssam .scan_name = "default", 1370170530Ssam .scan_attach = sta_attach, 1371170530Ssam .scan_detach = sta_detach, 1372170530Ssam .scan_start = sta_start, 1373170530Ssam .scan_restart = sta_restart, 1374170530Ssam .scan_cancel = sta_cancel, 1375170530Ssam .scan_end = sta_pick_bss, 1376170530Ssam .scan_flush = sta_flush, 1377170530Ssam .scan_add = sta_add, 1378170530Ssam .scan_age = sta_age, 1379170530Ssam .scan_iterate = sta_iterate, 1380170530Ssam .scan_assoc_fail = sta_assoc_fail, 1381170530Ssam .scan_assoc_success = sta_assoc_success, 1382170530Ssam}; 1383170530Ssam 1384170530Ssam/* 1385170530Ssam * Adhoc mode-specific support. 1386170530Ssam */ 1387170530Ssam 1388170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1389170530Ssam{ 5180, 5200, 5220, 5240 }; 1390170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1391170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1392170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1393170530Ssam{ 5170, 5190, 5210, 5230 }; 1394170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1395170530Ssam{ 2457, 2462 }; 1396170530Ssam 1397170530Ssamstatic const struct scanlist adhocScanTable[] = { 1398170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1399170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1400170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1401170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1402170530Ssam { .list = NULL } 1403170530Ssam}; 1404170530Ssam#undef X 1405170530Ssam 1406170530Ssam/* 1407170530Ssam * Start an adhoc-mode scan by populating the channel list. 1408170530Ssam */ 1409170530Ssamstatic int 1410178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1411170530Ssam{ 1412170530Ssam struct sta_table *st = ss->ss_priv; 1413170530Ssam 1414178354Ssam makescanlist(ss, vap, adhocScanTable); 1415176653Ssam 1416178354Ssam if (ss->ss_mindwell == 0) 1417178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1418178354Ssam if (ss->ss_maxdwell == 0) 1419178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1420176653Ssam 1421178354Ssam st->st_scangen++; 1422170530Ssam st->st_newscan = 1; 1423170530Ssam 1424170530Ssam return 0; 1425170530Ssam} 1426170530Ssam 1427170530Ssam/* 1428170530Ssam * Select a channel to start an adhoc network on. 1429170530Ssam * The channel list was populated with appropriate 1430170530Ssam * channels so select one that looks least occupied. 1431170530Ssam */ 1432170530Ssamstatic struct ieee80211_channel * 1433178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1434170530Ssam{ 1435170530Ssam struct sta_table *st = ss->ss_priv; 1436170530Ssam struct sta_entry *se; 1437170530Ssam struct ieee80211_channel *c, *bestchan; 1438170530Ssam int i, bestrssi, maxrssi; 1439170530Ssam 1440170530Ssam bestchan = NULL; 1441170530Ssam bestrssi = -1; 1442170530Ssam 1443170530Ssam mtx_lock(&st->st_lock); 1444170530Ssam for (i = 0; i < ss->ss_last; i++) { 1445170530Ssam c = ss->ss_chans[i]; 1446178354Ssam /* never consider a channel with radar */ 1447178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1448176653Ssam continue; 1449178354Ssam /* skip channels disallowed by regulatory settings */ 1450178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1451178354Ssam continue; 1452178354Ssam /* check channel attributes for band compatibility */ 1453178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1454178354Ssam continue; 1455170530Ssam maxrssi = 0; 1456170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1457170530Ssam if (se->base.se_chan != c) 1458170530Ssam continue; 1459170530Ssam if (se->base.se_rssi > maxrssi) 1460170530Ssam maxrssi = se->base.se_rssi; 1461170530Ssam } 1462170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1463170530Ssam bestchan = c; 1464170530Ssam } 1465170530Ssam mtx_unlock(&st->st_lock); 1466170530Ssam 1467170530Ssam return bestchan; 1468170530Ssam} 1469170530Ssam 1470170530Ssam/* 1471170530Ssam * Pick an ibss network to join or find a channel 1472170530Ssam * to use to start an ibss network. 1473170530Ssam */ 1474170530Ssamstatic int 1475178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1476170530Ssam{ 1477170530Ssam struct sta_table *st = ss->ss_priv; 1478170530Ssam struct sta_entry *selbs; 1479170530Ssam struct ieee80211_channel *chan; 1480170530Ssam 1481178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1482178354Ssam vap->iv_opmode == IEEE80211_M_AHDEMO, 1483178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1484170530Ssam 1485170530Ssam if (st->st_newscan) { 1486170530Ssam sta_update_notseen(st); 1487170530Ssam st->st_newscan = 0; 1488170530Ssam } 1489170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1490170530Ssam /* 1491170530Ssam * Manual/background scan, don't select+join the 1492170530Ssam * bss, just return. The scanning framework will 1493170530Ssam * handle notification that this has completed. 1494170530Ssam */ 1495170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1496170530Ssam return 1; 1497170530Ssam } 1498170530Ssam /* 1499170530Ssam * Automatic sequencing; look for a candidate and 1500170530Ssam * if found join the network. 1501170530Ssam */ 1502170530Ssam /* NB: unlocked read should be ok */ 1503170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1504178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1505170530Ssam "%s: no scan candidate\n", __func__); 1506178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1507178354Ssam return 0; 1508170530Ssamnotfound: 1509186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1510186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1511186904Ssam if (vap->iv_des_nssid && 1512186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1513186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1514186904Ssam#else 1515178354Ssam if (vap->iv_des_nssid) { 1516186904Ssam#endif 1517170530Ssam /* 1518170530Ssam * No existing adhoc network to join and we have 1519170530Ssam * an ssid; start one up. If no channel was 1520170530Ssam * specified, try to select a channel. 1521170530Ssam */ 1522178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1523178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1524183421Ssam struct ieee80211com *ic = vap->iv_ic; 1525183421Ssam 1526183421Ssam chan = adhoc_pick_channel(ss, 0); 1527183421Ssam if (chan != NULL) 1528183421Ssam chan = ieee80211_ht_adjust_channel(ic, 1529183421Ssam chan, vap->iv_flags_ext); 1530178354Ssam } else 1531178354Ssam chan = vap->iv_des_chan; 1532170530Ssam if (chan != NULL) { 1533178354Ssam ieee80211_create_ibss(vap, chan); 1534170530Ssam return 1; 1535170530Ssam } 1536170530Ssam } 1537170530Ssam /* 1538170530Ssam * If nothing suitable was found decrement 1539170530Ssam * the failure counts so entries will be 1540170530Ssam * reconsidered the next time around. We 1541170530Ssam * really want to do this only for sta's 1542170530Ssam * where we've previously had some success. 1543170530Ssam */ 1544170530Ssam sta_dec_fails(st); 1545170530Ssam st->st_newscan = 1; 1546170530Ssam return 0; /* restart scan */ 1547170530Ssam } 1548178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1549178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1550178354Ssam return (selbs != NULL); 1551184274Ssam if (selbs == NULL) 1552170530Ssam goto notfound; 1553184274Ssam chan = selbs->base.se_chan; 1554184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1555184302Ssam chan = demote11b(vap, chan); 1556184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1557184274Ssam goto notfound; 1558170530Ssam return 1; /* terminate scan */ 1559170530Ssam} 1560170530Ssam 1561170530Ssam/* 1562170530Ssam * Age entries in the scan cache. 1563170530Ssam */ 1564170530Ssamstatic void 1565170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1566170530Ssam{ 1567170530Ssam struct sta_table *st = ss->ss_priv; 1568170530Ssam struct sta_entry *se, *next; 1569170530Ssam 1570170530Ssam mtx_lock(&st->st_lock); 1571170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1572170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1573170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1574170530Ssam LIST_REMOVE(se, se_hash); 1575178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1576186302Ssam free(se, M_80211_SCAN); 1577170530Ssam } 1578170530Ssam } 1579170530Ssam mtx_unlock(&st->st_lock); 1580170530Ssam} 1581170530Ssam 1582170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1583170530Ssam .scan_name = "default", 1584170530Ssam .scan_attach = sta_attach, 1585170530Ssam .scan_detach = sta_detach, 1586170530Ssam .scan_start = adhoc_start, 1587170530Ssam .scan_restart = sta_restart, 1588170530Ssam .scan_cancel = sta_cancel, 1589170530Ssam .scan_end = adhoc_pick_bss, 1590170530Ssam .scan_flush = sta_flush, 1591178354Ssam .scan_pickchan = adhoc_pick_channel, 1592170530Ssam .scan_add = sta_add, 1593170530Ssam .scan_age = adhoc_age, 1594170530Ssam .scan_iterate = sta_iterate, 1595170530Ssam .scan_assoc_fail = sta_assoc_fail, 1596170530Ssam .scan_assoc_success = sta_assoc_success, 1597170530Ssam}; 1598170530Ssam 1599178354Ssamstatic void 1600178354Ssamap_force_promisc(struct ieee80211com *ic) 1601178354Ssam{ 1602178354Ssam struct ifnet *ifp = ic->ic_ifp; 1603178354Ssam 1604178354Ssam IEEE80211_LOCK(ic); 1605178354Ssam /* set interface into promiscuous mode */ 1606178354Ssam ifp->if_flags |= IFF_PROMISC; 1607178354Ssam ic->ic_update_promisc(ifp); 1608178354Ssam IEEE80211_UNLOCK(ic); 1609178354Ssam} 1610178354Ssam 1611178354Ssamstatic void 1612178354Ssamap_reset_promisc(struct ieee80211com *ic) 1613178354Ssam{ 1614178354Ssam IEEE80211_LOCK(ic); 1615178354Ssam ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1616178354Ssam IEEE80211_UNLOCK(ic); 1617178354Ssam} 1618178354Ssam 1619178354Ssamstatic int 1620178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1621178354Ssam{ 1622178354Ssam struct sta_table *st = ss->ss_priv; 1623178354Ssam 1624178354Ssam makescanlist(ss, vap, staScanTable); 1625178354Ssam 1626178354Ssam if (ss->ss_mindwell == 0) 1627178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1628178354Ssam if (ss->ss_maxdwell == 0) 1629178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1630178354Ssam 1631178354Ssam st->st_scangen++; 1632178354Ssam st->st_newscan = 1; 1633178354Ssam 1634178354Ssam ap_force_promisc(vap->iv_ic); 1635178354Ssam return 0; 1636178354Ssam} 1637178354Ssam 1638170530Ssam/* 1639178354Ssam * Cancel an ongoing scan. 1640170530Ssam */ 1641170530Ssamstatic int 1642178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1643170530Ssam{ 1644178354Ssam ap_reset_promisc(vap->iv_ic); 1645178354Ssam return 0; 1646178354Ssam} 1647178354Ssam 1648178354Ssam/* 1649178354Ssam * Pick a quiet channel to use for ap operation. 1650178354Ssam */ 1651178354Ssamstatic struct ieee80211_channel * 1652178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1653178354Ssam{ 1654178354Ssam struct sta_table *st = ss->ss_priv; 1655178354Ssam struct ieee80211_channel *bestchan = NULL; 1656178354Ssam int i; 1657178354Ssam 1658178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1659178354Ssam /* NB: use scan list order to preserve channel preference */ 1660178354Ssam for (i = 0; i < ss->ss_last; i++) { 1661178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1662178354Ssam /* 1663178354Ssam * If the channel is unoccupied the max rssi 1664178354Ssam * should be zero; just take it. Otherwise 1665178354Ssam * track the channel with the lowest rssi and 1666178354Ssam * use that when all channels appear occupied. 1667178354Ssam */ 1668178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1669178354Ssam continue; 1670178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1671178354Ssam continue; 1672178354Ssam /* check channel attributes for band compatibility */ 1673178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1674178354Ssam continue; 1675186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1676178354Ssam /* XXX channel have interference */ 1677178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1678178354Ssam /* XXX use other considerations */ 1679178354Ssam return chan; 1680170530Ssam } 1681178354Ssam if (bestchan == NULL || 1682178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1683178354Ssam bestchan = chan; 1684178354Ssam } 1685178354Ssam return bestchan; 1686178354Ssam} 1687178354Ssam 1688178354Ssam/* 1689178354Ssam * Pick a quiet channel to use for ap operation. 1690178354Ssam */ 1691178354Ssamstatic int 1692178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1693178354Ssam{ 1694178354Ssam struct ieee80211com *ic = vap->iv_ic; 1695178354Ssam struct ieee80211_channel *bestchan; 1696178354Ssam 1697178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1698178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1699178354Ssam bestchan = ap_pick_channel(ss, 0); 1700178354Ssam if (bestchan == NULL) { 1701178354Ssam /* no suitable channel, should not happen */ 1702178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1703178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1704178354Ssam /* XXX print something? */ 1705178354Ssam return 0; /* restart scan */ 1706178354Ssam } 1707178354Ssam /* 1708178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1709178354Ssam */ 1710178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1711178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1712178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1713178354Ssam if (bestchan == NULL) { 1714178354Ssam /* should never happen ?? */ 1715178354Ssam return 0; 1716170530Ssam } 1717170530Ssam } 1718178354Ssam ap_reset_promisc(ic); 1719178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1720178354Ssam /* 1721178354Ssam * Manual/background scan, don't select+join the 1722178354Ssam * bss, just return. The scanning framework will 1723178354Ssam * handle notification that this has completed. 1724178354Ssam */ 1725178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1726178354Ssam return 1; 1727178354Ssam } 1728178354Ssam ieee80211_create_ibss(vap, 1729178354Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ext)); 1730178354Ssam return 1; 1731170530Ssam} 1732170530Ssam 1733178354Ssamstatic const struct ieee80211_scanner ap_default = { 1734178354Ssam .scan_name = "default", 1735178354Ssam .scan_attach = sta_attach, 1736178354Ssam .scan_detach = sta_detach, 1737178354Ssam .scan_start = ap_start, 1738178354Ssam .scan_restart = sta_restart, 1739178354Ssam .scan_cancel = ap_cancel, 1740178354Ssam .scan_end = ap_end, 1741178354Ssam .scan_flush = sta_flush, 1742178354Ssam .scan_pickchan = ap_pick_channel, 1743178354Ssam .scan_add = sta_add, 1744178354Ssam .scan_age = adhoc_age, 1745178354Ssam .scan_iterate = sta_iterate, 1746178354Ssam .scan_assoc_success = sta_assoc_success, 1747178354Ssam .scan_assoc_fail = sta_assoc_fail, 1748170530Ssam}; 1749178354Ssam 1750178354Ssam/* 1751178354Ssam * Module glue. 1752178354Ssam */ 1753178354SsamIEEE80211_SCANNER_MODULE(sta, 1); 1754178354SsamIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1755178354SsamIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1756178354SsamIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1757178354SsamIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1758