ieee80211_scan_sta.c revision 184210
1170530Ssam/*- 2178354Ssam * Copyright (c) 2002-2008 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 184210 2008-10-23 19:57:13Z des $"); 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> 48170530Ssam 49170530Ssam#include <net/bpf.h> 50170530Ssam 51170530Ssam/* 52170530Ssam * Parameters for managing cache entries: 53170530Ssam * 54170530Ssam * o a station with STA_FAILS_MAX failures is not considered 55170530Ssam * when picking a candidate 56170530Ssam * o a station that hasn't had an update in STA_PURGE_SCANS 57170530Ssam * (background) scans is discarded 58170530Ssam * o after STA_FAILS_AGE seconds we clear the failure count 59170530Ssam */ 60170530Ssam#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 61170530Ssam#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 62170530Ssam#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 63170530Ssam 64170530Ssam/* XXX tunable */ 65170530Ssam#define STA_RSSI_MIN 8 /* min acceptable rssi */ 66170530Ssam#define STA_RSSI_MAX 40 /* max rssi for comparison */ 67170530Ssam 68170530Ssamstruct sta_entry { 69170530Ssam struct ieee80211_scan_entry base; 70170530Ssam TAILQ_ENTRY(sta_entry) se_list; 71170530Ssam LIST_ENTRY(sta_entry) se_hash; 72170530Ssam uint8_t se_fails; /* failure to associate count */ 73170530Ssam uint8_t se_seen; /* seen during current scan */ 74170530Ssam uint8_t se_notseen; /* not seen in previous scans */ 75170530Ssam uint8_t se_flags; 76178354Ssam#define STA_SSID_MATCH 0x01 77178354Ssam#define STA_BSSID_MATCH 0x02 78170530Ssam uint32_t se_avgrssi; /* LPF rssi state */ 79170530Ssam unsigned long se_lastupdate; /* time of last update */ 80170530Ssam unsigned long se_lastfail; /* time of last failure */ 81170530Ssam unsigned long se_lastassoc; /* time of last association */ 82170530Ssam u_int se_scangen; /* iterator scan gen# */ 83178354Ssam u_int se_countrygen; /* gen# of last cc notify */ 84170530Ssam}; 85170530Ssam 86170530Ssam#define STA_HASHSIZE 32 87170530Ssam/* simple hash is enough for variation of macaddr */ 88170530Ssam#define STA_HASH(addr) \ 89170530Ssam (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 90170530Ssam 91170530Ssamstruct sta_table { 92170530Ssam struct mtx st_lock; /* on scan table */ 93170530Ssam TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 94170530Ssam LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 95178354Ssam struct mtx st_scanlock; /* on st_scaniter */ 96178354Ssam u_int st_scaniter; /* gen# for iterator */ 97178354Ssam u_int st_scangen; /* scan generation # */ 98170530Ssam int st_newscan; 99178354Ssam /* ap-related state */ 100178354Ssam int st_maxrssi[IEEE80211_CHAN_MAX]; 101170530Ssam}; 102170530Ssam 103170530Ssamstatic void sta_flush_table(struct sta_table *); 104171409Ssam/* 105171409Ssam * match_bss returns a bitmask describing if an entry is suitable 106171409Ssam * for use. If non-zero the entry was deemed not suitable and it's 107171409Ssam * contents explains why. The following flags are or'd to to this 108171409Ssam * mask and can be used to figure out why the entry was rejected. 109171409Ssam */ 110171409Ssam#define MATCH_CHANNEL 0x001 /* channel mismatch */ 111171409Ssam#define MATCH_CAPINFO 0x002 /* capabilities mismatch, e.g. no ess */ 112171409Ssam#define MATCH_PRIVACY 0x004 /* privacy mismatch */ 113171409Ssam#define MATCH_RATE 0x008 /* rate set mismatch */ 114171409Ssam#define MATCH_SSID 0x010 /* ssid mismatch */ 115171409Ssam#define MATCH_BSSID 0x020 /* bssid mismatch */ 116171409Ssam#define MATCH_FAILS 0x040 /* too many failed auth attempts */ 117171409Ssam#define MATCH_NOTSEEN 0x080 /* not seen in recent scans */ 118171409Ssam#define MATCH_RSSI 0x100 /* rssi deemed too low to use */ 119178354Ssam#define MATCH_CC 0x200 /* country code mismatch */ 120178354Ssamstatic int match_bss(struct ieee80211vap *, 121170530Ssam const struct ieee80211_scan_state *, struct sta_entry *, int); 122178354Ssamstatic void adhoc_age(struct ieee80211_scan_state *); 123170530Ssam 124178354Ssamstatic __inline int 125178354Ssamisocmp(const uint8_t cc1[], const uint8_t cc2[]) 126178354Ssam{ 127178354Ssam return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 128178354Ssam} 129178354Ssam 130170530Ssam/* number of references from net80211 layer */ 131170530Ssamstatic int nrefs = 0; 132170530Ssam 133170530Ssam/* 134170530Ssam * Attach prior to any scanning work. 135170530Ssam */ 136170530Ssamstatic int 137170530Ssamsta_attach(struct ieee80211_scan_state *ss) 138170530Ssam{ 139170530Ssam struct sta_table *st; 140170530Ssam 141184210Sdes MALLOC(st, struct sta_table *, sizeof(struct sta_table), 142170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 143170530Ssam if (st == NULL) 144170530Ssam return 0; 145170530Ssam mtx_init(&st->st_lock, "scantable", "802.11 scan table", MTX_DEF); 146170530Ssam mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 147170530Ssam TAILQ_INIT(&st->st_entry); 148170530Ssam ss->ss_priv = st; 149170530Ssam nrefs++; /* NB: we assume caller locking */ 150170530Ssam return 1; 151170530Ssam} 152170530Ssam 153170530Ssam/* 154170530Ssam * Cleanup any private state. 155170530Ssam */ 156170530Ssamstatic int 157170530Ssamsta_detach(struct ieee80211_scan_state *ss) 158170530Ssam{ 159170530Ssam struct sta_table *st = ss->ss_priv; 160170530Ssam 161170530Ssam if (st != NULL) { 162170530Ssam sta_flush_table(st); 163170530Ssam mtx_destroy(&st->st_lock); 164170530Ssam mtx_destroy(&st->st_scanlock); 165184210Sdes FREE(st, M_80211_SCAN); 166170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 167170530Ssam nrefs--; /* NB: we assume caller locking */ 168170530Ssam } 169170530Ssam return 1; 170170530Ssam} 171170530Ssam 172170530Ssam/* 173170530Ssam * Flush all per-scan state. 174170530Ssam */ 175170530Ssamstatic int 176170530Ssamsta_flush(struct ieee80211_scan_state *ss) 177170530Ssam{ 178170530Ssam struct sta_table *st = ss->ss_priv; 179170530Ssam 180170530Ssam mtx_lock(&st->st_lock); 181170530Ssam sta_flush_table(st); 182170530Ssam mtx_unlock(&st->st_lock); 183170530Ssam ss->ss_last = 0; 184170530Ssam return 0; 185170530Ssam} 186170530Ssam 187170530Ssam/* 188170530Ssam * Flush all entries in the scan cache. 189170530Ssam */ 190170530Ssamstatic void 191170530Ssamsta_flush_table(struct sta_table *st) 192170530Ssam{ 193170530Ssam struct sta_entry *se, *next; 194170530Ssam 195170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 196170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 197170530Ssam LIST_REMOVE(se, se_hash); 198178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 199184210Sdes FREE(se, M_80211_SCAN); 200170530Ssam } 201178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 202170530Ssam} 203170530Ssam 204170530Ssam/* 205170530Ssam * Process a beacon or probe response frame; create an 206170530Ssam * entry in the scan cache or update any previous entry. 207170530Ssam */ 208170530Ssamstatic int 209170530Ssamsta_add(struct ieee80211_scan_state *ss, 210170530Ssam const struct ieee80211_scanparams *sp, 211170530Ssam const struct ieee80211_frame *wh, 212170530Ssam int subtype, int rssi, int noise, int rstamp) 213170530Ssam{ 214170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 215170530Ssam#define PICK1ST(_ss) \ 216170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 217170530Ssam IEEE80211_SCAN_PICK1ST) 218170530Ssam struct sta_table *st = ss->ss_priv; 219170530Ssam const uint8_t *macaddr = wh->i_addr2; 220178354Ssam struct ieee80211vap *vap = ss->ss_vap; 221178354Ssam struct ieee80211com *ic = vap->iv_ic; 222170530Ssam struct sta_entry *se; 223170530Ssam struct ieee80211_scan_entry *ise; 224178354Ssam int hash; 225170530Ssam 226170530Ssam hash = STA_HASH(macaddr); 227170530Ssam 228170530Ssam mtx_lock(&st->st_lock); 229170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 230170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 231170530Ssam goto found; 232184210Sdes MALLOC(se, struct sta_entry *, sizeof(struct sta_entry), 233170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 234170530Ssam if (se == NULL) { 235170530Ssam mtx_unlock(&st->st_lock); 236170530Ssam return 0; 237170530Ssam } 238178354Ssam se->se_scangen = st->st_scaniter-1; 239178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 240170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 241170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 242170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 243170530Ssamfound: 244170530Ssam ise = &se->base; 245170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 246170530Ssam if (sp->ssid[1] != 0 && 247170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 248170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 249170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 250170530Ssam ("rate set too large: %u", sp->rates[1])); 251170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 252170530Ssam if (sp->xrates != NULL) { 253170530Ssam /* XXX validate xrates[1] */ 254178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 255170530Ssam ("xrate set too large: %u", sp->xrates[1])); 256170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 257170530Ssam } else 258170530Ssam ise->se_xrates[1] = 0; 259170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 260178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 261173368Ssam /* 262173368Ssam * Record rssi data using extended precision LPF filter. 263173368Ssam * 264173368Ssam * NB: use only on-channel data to insure we get a good 265173368Ssam * estimate of the signal we'll see when associated. 266173368Ssam */ 267178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 268178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 269173368Ssam ise->se_noise = noise; 270173368Ssam } 271170530Ssam ise->se_rstamp = rstamp; 272170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 273170530Ssam ise->se_intval = sp->bintval; 274170530Ssam ise->se_capinfo = sp->capinfo; 275173368Ssam /* 276173368Ssam * Beware of overriding se_chan for frames seen 277173368Ssam * off-channel; this can cause us to attempt an 278178354Ssam * association on the wrong channel. 279173368Ssam */ 280178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 281173862Ssam struct ieee80211_channel *c; 282173368Ssam /* 283173862Ssam * Off-channel, locate the home/bss channel for the sta 284178354Ssam * using the value broadcast in the DSPARMS ie. We know 285178354Ssam * sp->chan has this value because it's used to calculate 286178354Ssam * IEEE80211_BPARSE_OFFCHAN. 287173368Ssam */ 288178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 289178354Ssam ic->ic_curchan->ic_flags); 290173956Ssam if (c != NULL) { 291173956Ssam ise->se_chan = c; 292173956Ssam } else if (ise->se_chan == NULL) { 293173862Ssam /* should not happen, pick something */ 294178354Ssam ise->se_chan = ic->ic_curchan; 295173862Ssam } 296173862Ssam } else 297178354Ssam ise->se_chan = ic->ic_curchan; 298170530Ssam ise->se_fhdwell = sp->fhdwell; 299170530Ssam ise->se_fhindex = sp->fhindex; 300170530Ssam ise->se_erp = sp->erp; 301170530Ssam ise->se_timoff = sp->timoff; 302170530Ssam if (sp->tim != NULL) { 303170530Ssam const struct ieee80211_tim_ie *tim = 304170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 305170530Ssam ise->se_dtimperiod = tim->tim_period; 306170530Ssam } 307178354Ssam if (sp->country != NULL) { 308178354Ssam const struct ieee80211_country_ie *cie = 309178354Ssam (const struct ieee80211_country_ie *) sp->country; 310178354Ssam /* 311178354Ssam * If 11d is enabled and we're attempting to join a bss 312178354Ssam * that advertises it's country code then compare our 313178354Ssam * current settings to what we fetched from the country ie. 314178354Ssam * If our country code is unspecified or different then 315178354Ssam * dispatch an event to user space that identifies the 316178354Ssam * country code so our regdomain config can be changed. 317178354Ssam */ 318178354Ssam /* XXX only for STA mode? */ 319178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 320178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 321178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 322178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 323178354Ssam /* only issue one notify event per scan */ 324178354Ssam if (se->se_countrygen != st->st_scangen) { 325178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 326178354Ssam cie->cc); 327178354Ssam se->se_countrygen = st->st_scangen; 328178354Ssam } 329178354Ssam } 330178354Ssam ise->se_cc[0] = cie->cc[0]; 331178354Ssam ise->se_cc[1] = cie->cc[1]; 332178354Ssam } 333178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 334178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 335170530Ssam 336170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 337170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 338170530Ssam se->se_fails = 0; 339178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 340170530Ssam "%s: fails %u", __func__, se->se_fails); 341170530Ssam } 342170530Ssam 343170530Ssam se->se_lastupdate = ticks; /* update time */ 344170530Ssam se->se_seen = 1; 345170530Ssam se->se_notseen = 0; 346170530Ssam 347178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 348178354Ssam st->st_maxrssi[sp->bchan] = rssi; 349178354Ssam 350170530Ssam mtx_unlock(&st->st_lock); 351170530Ssam 352170530Ssam /* 353170530Ssam * If looking for a quick choice and nothing's 354170530Ssam * been found check here. 355170530Ssam */ 356178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 357170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 358170530Ssam 359170530Ssam return 1; 360170530Ssam#undef PICK1ST 361170530Ssam#undef ISPROBE 362170530Ssam} 363170530Ssam 364170530Ssam/* 365170530Ssam * Check if a channel is excluded by user request. 366170530Ssam */ 367170530Ssamstatic int 368178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 369170530Ssam{ 370178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 371178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 372178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 373170530Ssam} 374170530Ssam 375170530Ssamstatic struct ieee80211_channel * 376170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 377170530Ssam{ 378170530Ssam struct ieee80211_channel *c; 379170530Ssam int j; 380170530Ssam 381170530Ssam /* 382170530Ssam * The normal ordering in the channel list is b channel 383170530Ssam * immediately followed by g so optimize the search for 384170530Ssam * this. We'll still do a full search just in case. 385170530Ssam */ 386170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 387170530Ssam c = &ic->ic_channels[j]; 388170530Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) 389170530Ssam return c; 390170530Ssam } 391170530Ssam for (j = 0; j < i; j++) { 392170530Ssam c = &ic->ic_channels[j]; 393170530Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) 394170530Ssam return c; 395170530Ssam } 396170530Ssam return NULL; 397170530Ssam} 398170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 399170530Ssam IEEE80211_CHAN_B, /* IEEE80211_MODE_AUTO */ 400170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 401170530Ssam IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 402170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_11G */ 403170530Ssam IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 404170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_TURBO_A (check base channel)*/ 405170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_TURBO_G */ 406170530Ssam IEEE80211_CHAN_ST, /* IEEE80211_MODE_STURBO_A */ 407170530Ssam IEEE80211_CHAN_A, /* IEEE80211_MODE_11NA (check legacy) */ 408170530Ssam IEEE80211_CHAN_G, /* IEEE80211_MODE_11NG (check legacy) */ 409170530Ssam}; 410170530Ssam 411170530Ssamstatic void 412178354Ssamadd_channels(struct ieee80211vap *vap, 413170530Ssam struct ieee80211_scan_state *ss, 414170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 415170530Ssam{ 416170530Ssam#define N(a) (sizeof(a) / sizeof(a[0])) 417178354Ssam struct ieee80211com *ic = vap->iv_ic; 418170530Ssam struct ieee80211_channel *c, *cg; 419170530Ssam u_int modeflags; 420170530Ssam int i; 421170530Ssam 422170530Ssam KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 423170530Ssam modeflags = chanflags[mode]; 424170530Ssam for (i = 0; i < nfreq; i++) { 425170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 426170530Ssam break; 427170530Ssam 428170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 429178354Ssam if (c == NULL || isexcluded(vap, c)) 430170530Ssam continue; 431170530Ssam if (mode == IEEE80211_MODE_AUTO) { 432170530Ssam /* 433170530Ssam * XXX special-case 11b/g channels so we select 434178354Ssam * the g channel if both are present. 435170530Ssam */ 436178354Ssam if (IEEE80211_IS_CHAN_B(c) && 437178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 438178354Ssam c = cg; 439170530Ssam } 440170530Ssam ss->ss_chans[ss->ss_last++] = c; 441170530Ssam } 442170530Ssam#undef N 443170530Ssam} 444170530Ssam 445170530Ssamstruct scanlist { 446170530Ssam uint16_t mode; 447170530Ssam uint16_t count; 448170530Ssam const uint16_t *list; 449170530Ssam}; 450170530Ssam 451170530Ssamstatic int 452170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 453170530Ssam{ 454170530Ssam int i; 455170530Ssam 456170530Ssam for (; scan->list != NULL; scan++) { 457170530Ssam for (i = 0; i < scan->count; i++) 458170530Ssam if (scan->list[i] == c->ic_freq) 459170530Ssam return 1; 460170530Ssam } 461170530Ssam return 0; 462170530Ssam} 463170530Ssam 464176653Ssamstatic void 465178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 466176653Ssam const struct scanlist table[]) 467176653Ssam{ 468178354Ssam struct ieee80211com *ic = vap->iv_ic; 469176653Ssam struct ieee80211_channel *c; 470176653Ssam int i; 471176653Ssam 472176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 473176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 474176653Ssam break; 475176653Ssam 476176653Ssam c = &ic->ic_channels[i]; 477176653Ssam /* 478176653Ssam * Ignore dynamic turbo channels; we scan them 479176653Ssam * in normal mode (i.e. not boosted). Likewise 480176653Ssam * for HT channels, they get scanned using 481176653Ssam * legacy rates. 482176653Ssam */ 483176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 484176653Ssam continue; 485176653Ssam 486176653Ssam /* 487176653Ssam * If a desired mode was specified, scan only 488176653Ssam * channels that satisfy that constraint. 489176653Ssam */ 490178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 491178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 492176653Ssam continue; 493176653Ssam 494176653Ssam /* 495176653Ssam * Skip channels excluded by user request. 496176653Ssam */ 497178354Ssam if (isexcluded(vap, c)) 498176653Ssam continue; 499176653Ssam 500176653Ssam /* 501176653Ssam * Add the channel unless it is listed in the 502176653Ssam * fixed scan order tables. This insures we 503176653Ssam * don't sweep back in channels we filtered out 504176653Ssam * above. 505176653Ssam */ 506176653Ssam if (checktable(table, c)) 507176653Ssam continue; 508176653Ssam 509176653Ssam /* Add channel to scanning list. */ 510176653Ssam ss->ss_chans[ss->ss_last++] = c; 511176653Ssam } 512176653Ssam} 513176653Ssam 514178354Ssamstatic void 515178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 516178354Ssam const struct scanlist table[]) 517170530Ssam{ 518170530Ssam const struct scanlist *scan; 519170530Ssam enum ieee80211_phymode mode; 520170530Ssam 521170530Ssam ss->ss_last = 0; 522170530Ssam /* 523170530Ssam * Use the table of ordered channels to construct the list 524170530Ssam * of channels for scanning. Any channels in the ordered 525170530Ssam * list not in the master list will be discarded. 526170530Ssam */ 527178354Ssam for (scan = table; scan->list != NULL; scan++) { 528170530Ssam mode = scan->mode; 529178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 530170530Ssam /* 531170530Ssam * If a desired mode was specified, scan only 532170530Ssam * channels that satisfy that constraint. 533170530Ssam */ 534178354Ssam if (vap->iv_des_mode != mode) { 535170530Ssam /* 536170530Ssam * The scan table marks 2.4Ghz channels as b 537170530Ssam * so if the desired mode is 11g, then use 538170530Ssam * the 11b channel list but upgrade the mode. 539170530Ssam */ 540178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_11G || 541170530Ssam mode != IEEE80211_MODE_11B) 542170530Ssam continue; 543170530Ssam mode = IEEE80211_MODE_11G; /* upgrade */ 544170530Ssam } 545170530Ssam } else { 546170530Ssam /* 547170530Ssam * This lets add_channels upgrade an 11b channel 548170530Ssam * to 11g if available. 549170530Ssam */ 550170530Ssam if (mode == IEEE80211_MODE_11B) 551170530Ssam mode = IEEE80211_MODE_AUTO; 552170530Ssam } 553170530Ssam#ifdef IEEE80211_F_XR 554170530Ssam /* XR does not operate on turbo channels */ 555178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 556170530Ssam (mode == IEEE80211_MODE_TURBO_A || 557170530Ssam mode == IEEE80211_MODE_TURBO_G || 558170530Ssam mode == IEEE80211_MODE_STURBO_A)) 559170530Ssam continue; 560170530Ssam#endif 561170530Ssam /* 562170530Ssam * Add the list of the channels; any that are not 563170530Ssam * in the master channel list will be discarded. 564170530Ssam */ 565178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 566170530Ssam } 567170530Ssam 568170530Ssam /* 569178354Ssam * Add the channels from the ic that are not present 570178354Ssam * in the table. 571170530Ssam */ 572178354Ssam sweepchannels(ss, vap, table); 573178354Ssam} 574170530Ssam 575178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 576178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 577178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 578178354Ssam{ 5170, 5190, 5210, 5230 }; 579178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 580178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 581178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 582178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 583178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 584178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 585178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 586178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 587178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 588178354Ssam{ 2484 }; 589178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 590178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 591178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 592178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 593178354Ssam#ifdef ATH_TURBO_SCAN 594178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 595178354Ssam{ 5210, 5250, 5290 }; 596178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 597178354Ssam{ 5760, 5800 }; 598178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 599178354Ssam{ 5540, 5580, 5620, 5660 }; 600178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 601178354Ssam{ 2437 }; 602178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 603178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 604178354Ssam#endif /* ATH_TURBO_SCAN */ 605170530Ssam 606178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 607170530Ssam 608178354Ssamstatic const struct scanlist staScanTable[] = { 609178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 610178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 611178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 612178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 613178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 614178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 615178354Ssam#ifdef ATH_TURBO_SCAN 616178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 617178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 618178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 619178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 620178354Ssam#endif /* ATH_TURBO_SCAN */ 621178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 622178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 623178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 624178354Ssam#ifdef ATH_TURBO_SCAN 625178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 626178354Ssam#endif /* ATH_TURBO_SCAN */ 627178354Ssam { .list = NULL } 628178354Ssam}; 629178354Ssam 630178354Ssam/* 631178354Ssam * Start a station-mode scan by populating the channel list. 632178354Ssam */ 633178354Ssamstatic int 634178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 635178354Ssam{ 636178354Ssam struct sta_table *st = ss->ss_priv; 637178354Ssam 638178354Ssam makescanlist(ss, vap, staScanTable); 639178354Ssam 640178354Ssam if (ss->ss_mindwell == 0) 641178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 642178354Ssam if (ss->ss_maxdwell == 0) 643178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 644178354Ssam 645178354Ssam st->st_scangen++; 646170530Ssam st->st_newscan = 1; 647170530Ssam 648170530Ssam return 0; 649170530Ssam} 650170530Ssam 651170530Ssam/* 652178354Ssam * Restart a scan, typically a bg scan but can 653178354Ssam * also be a fg scan that came up empty. 654170530Ssam */ 655170530Ssamstatic int 656178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 657170530Ssam{ 658170530Ssam struct sta_table *st = ss->ss_priv; 659170530Ssam 660170530Ssam st->st_newscan = 1; 661170530Ssam return 0; 662170530Ssam} 663170530Ssam 664170530Ssam/* 665170530Ssam * Cancel an ongoing scan. 666170530Ssam */ 667170530Ssamstatic int 668178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 669170530Ssam{ 670170530Ssam return 0; 671170530Ssam} 672170530Ssam 673178354Ssam/* unalligned little endian access */ 674178354Ssam#define LE_READ_2(p) \ 675178354Ssam ((uint16_t) \ 676178354Ssam ((((const uint8_t *)(p))[0] ) | \ 677178354Ssam (((const uint8_t *)(p))[1] << 8))) 678178354Ssam 679178354Ssamstatic int 680170530Ssammaxrate(const struct ieee80211_scan_entry *se) 681170530Ssam{ 682178354Ssam const struct ieee80211_ie_htcap *htcap = 683178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 684178354Ssam int rmax, r, i; 685178354Ssam uint16_t caps; 686170530Ssam 687170530Ssam rmax = 0; 688178354Ssam if (htcap != NULL) { 689178354Ssam /* 690178354Ssam * HT station; inspect supported MCS and then adjust 691178354Ssam * rate by channel width. Could also include short GI 692178354Ssam * in this if we want to be extra accurate. 693178354Ssam */ 694178354Ssam /* XXX assumes MCS15 is max */ 695178354Ssam for (i = 15; i >= 0 && isclr(htcap->hc_mcsset, i); i--) 696178354Ssam ; 697178354Ssam if (i >= 0) { 698178354Ssam caps = LE_READ_2(&htcap->hc_cap); 699178354Ssam /* XXX short/long GI */ 700178354Ssam if (caps & IEEE80211_HTCAP_CHWIDTH40) 701178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 702178354Ssam else 703178354Ssam rmax = ieee80211_htrates[i].ht40_rate_800ns; 704178354Ssam } 705178354Ssam } 706170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 707170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 708170530Ssam if (r > rmax) 709170530Ssam rmax = r; 710170530Ssam } 711170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 712170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 713170530Ssam if (r > rmax) 714170530Ssam rmax = r; 715170530Ssam } 716170530Ssam return rmax; 717170530Ssam} 718170530Ssam 719170530Ssam/* 720170530Ssam * Compare the capabilities of two entries and decide which is 721170530Ssam * more desirable (return >0 if a is considered better). Note 722170530Ssam * that we assume compatibility/usability has already been checked 723170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 724170530Ssam * Used to select the best scan candidate for association in a BSS. 725170530Ssam */ 726170530Ssamstatic int 727170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 728170530Ssam{ 729170530Ssam#define PREFER(_a,_b,_what) do { \ 730170530Ssam if (((_a) ^ (_b)) & (_what)) \ 731170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 732170530Ssam} while (0) 733178354Ssam int maxa, maxb; 734170530Ssam int8_t rssia, rssib; 735170530Ssam int weight; 736170530Ssam 737170530Ssam /* privacy support */ 738170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 739170530Ssam IEEE80211_CAPINFO_PRIVACY); 740170530Ssam 741170530Ssam /* compare count of previous failures */ 742170530Ssam weight = b->se_fails - a->se_fails; 743170530Ssam if (abs(weight) > 1) 744170530Ssam return weight; 745170530Ssam 746170530Ssam /* 747170530Ssam * Compare rssi. If the two are considered equivalent 748170530Ssam * then fallback to other criteria. We threshold the 749170530Ssam * comparisons to avoid selecting an ap purely by rssi 750170530Ssam * when both values may be good but one ap is otherwise 751170530Ssam * more desirable (e.g. an 11b-only ap with stronger 752170530Ssam * signal than an 11g ap). 753170530Ssam */ 754170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 755170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 756170530Ssam if (abs(rssib - rssia) < 5) { 757170530Ssam /* best/max rate preferred if signal level close enough XXX */ 758170530Ssam maxa = maxrate(&a->base); 759170530Ssam maxb = maxrate(&b->base); 760170530Ssam if (maxa != maxb) 761170530Ssam return maxa - maxb; 762170530Ssam /* XXX use freq for channel preference */ 763170530Ssam /* for now just prefer 5Ghz band to all other bands */ 764178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 765178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 766170530Ssam } 767170530Ssam /* all things being equal, use signal level */ 768170530Ssam return a->base.se_rssi - b->base.se_rssi; 769170530Ssam#undef PREFER 770170530Ssam} 771170530Ssam 772170530Ssam/* 773170530Ssam * Check rate set suitability and return the best supported rate. 774178354Ssam * XXX inspect MCS for HT 775170530Ssam */ 776170530Ssamstatic int 777178354Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se) 778170530Ssam{ 779170530Ssam#define RV(v) ((v) & IEEE80211_RATE_VAL) 780170530Ssam const struct ieee80211_rateset *srs; 781178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 782170530Ssam const uint8_t *rs; 783170530Ssam 784178354Ssam okrate = badrate = 0; 785170530Ssam 786178354Ssam srs = ieee80211_get_suprates(vap->iv_ic, se->se_chan); 787170530Ssam nrs = se->se_rates[1]; 788170530Ssam rs = se->se_rates+2; 789178354Ssam /* XXX MCS */ 790178354Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(se->se_chan)].ucastrate; 791170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 792170530Ssamagain: 793170530Ssam for (i = 0; i < nrs; i++) { 794170530Ssam r = RV(rs[i]); 795170530Ssam badrate = r; 796170530Ssam /* 797170530Ssam * Check any fixed rate is included. 798170530Ssam */ 799178354Ssam if (r == ucastrate) 800170530Ssam fixedrate = r; 801170530Ssam /* 802170530Ssam * Check against our supported rates. 803170530Ssam */ 804170530Ssam for (j = 0; j < srs->rs_nrates; j++) 805170530Ssam if (r == RV(srs->rs_rates[j])) { 806170530Ssam if (r > okrate) /* NB: track max */ 807170530Ssam okrate = r; 808170530Ssam break; 809170530Ssam } 810170530Ssam 811170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 812170530Ssam /* 813170530Ssam * Don't try joining a BSS, if we don't support 814170530Ssam * one of its basic rates. 815170530Ssam */ 816170530Ssam okrate = 0; 817170530Ssam goto back; 818170530Ssam } 819170530Ssam } 820170530Ssam if (rs == se->se_rates+2) { 821170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 822170530Ssam nrs = se->se_xrates[1]; 823170530Ssam rs = se->se_xrates+2; 824170530Ssam goto again; 825170530Ssam } 826170530Ssam 827170530Ssamback: 828178354Ssam if (okrate == 0 || ucastrate != fixedrate) 829170530Ssam return badrate | IEEE80211_RATE_BASIC; 830170530Ssam else 831170530Ssam return RV(okrate); 832170530Ssam#undef RV 833170530Ssam} 834170530Ssam 835170530Ssamstatic int 836170530Ssammatch_ssid(const uint8_t *ie, 837170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 838170530Ssam{ 839170530Ssam int i; 840170530Ssam 841170530Ssam for (i = 0; i < nssid; i++) { 842170530Ssam if (ie[1] == ssids[i].len && 843170530Ssam memcmp(ie+2, ssids[i].ssid, ie[1]) == 0) 844170530Ssam return 1; 845170530Ssam } 846170530Ssam return 0; 847170530Ssam} 848170530Ssam 849170530Ssam/* 850170530Ssam * Test a scan candidate for suitability/compatibility. 851170530Ssam */ 852170530Ssamstatic int 853178354Ssammatch_bss(struct ieee80211vap *vap, 854170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 855170530Ssam int debug) 856170530Ssam{ 857178354Ssam struct ieee80211com *ic = vap->iv_ic; 858170530Ssam struct ieee80211_scan_entry *se = &se0->base; 859178354Ssam uint8_t rate; 860178354Ssam int fail; 861170530Ssam 862170530Ssam fail = 0; 863170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 864171409Ssam fail |= MATCH_CHANNEL; 865170530Ssam /* 866170530Ssam * NB: normally the desired mode is used to construct 867170530Ssam * the channel list, but it's possible for the scan 868170530Ssam * cache to include entries for stations outside this 869170530Ssam * list so we check the desired mode here to weed them 870170530Ssam * out. 871170530Ssam */ 872178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 873170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 874178354Ssam chanflags[vap->iv_des_mode]) 875171409Ssam fail |= MATCH_CHANNEL; 876178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 877170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 878171409Ssam fail |= MATCH_CAPINFO; 879170530Ssam } else { 880170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 881171409Ssam fail |= MATCH_CAPINFO; 882178354Ssam /* 883178354Ssam * If 11d is enabled and we're attempting to join a bss 884178354Ssam * that advertises it's country code then compare our 885178354Ssam * current settings to what we fetched from the country ie. 886178354Ssam * If our country code is unspecified or different then do 887178354Ssam * not attempt to join the bss. We should have already 888178354Ssam * dispatched an event to user space that identifies the 889178354Ssam * new country code so our regdomain config should match. 890178354Ssam */ 891178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 892178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 893178354Ssam se->se_cc[0] != 0 && 894178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 895178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 896178354Ssam fail |= MATCH_CC; 897170530Ssam } 898178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 899170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 900171409Ssam fail |= MATCH_PRIVACY; 901170530Ssam } else { 902170530Ssam /* XXX does this mean privacy is supported or required? */ 903170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 904171409Ssam fail |= MATCH_PRIVACY; 905170530Ssam } 906178354Ssam rate = check_rate(vap, se); 907170530Ssam if (rate & IEEE80211_RATE_BASIC) 908171409Ssam fail |= MATCH_RATE; 909170530Ssam if (ss->ss_nssid != 0 && 910171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 911171409Ssam fail |= MATCH_SSID; 912178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 913178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 914178354Ssam fail |= MATCH_BSSID; 915170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 916171409Ssam fail |= MATCH_FAILS; 917170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 918171409Ssam fail |= MATCH_NOTSEEN; 919170530Ssam if (se->se_rssi < STA_RSSI_MIN) 920171409Ssam fail |= MATCH_RSSI; 921170530Ssam#ifdef IEEE80211_DEBUG 922178354Ssam if (ieee80211_msg(vap, debug)) { 923170530Ssam printf(" %c %s", 924171409Ssam fail & MATCH_FAILS ? '=' : 925171409Ssam fail & MATCH_NOTSEEN ? '^' : 926178354Ssam fail & MATCH_CC ? '$' : 927171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 928170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 929171409Ssam fail & MATCH_BSSID ? '!' : ' '); 930170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 931171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 932171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 933170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 934171409Ssam fail & MATCH_RATE ? '!' : ' '); 935170530Ssam printf(" %4s%c", 936170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 937170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 938170530Ssam "????", 939171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 940170530Ssam printf(" %3s%c ", 941170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 942170530Ssam "wep" : "no", 943171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 944170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 945171409Ssam printf("%s\n", fail & MATCH_SSID ? "!" : ""); 946170530Ssam } 947170530Ssam#endif 948170530Ssam return fail; 949170530Ssam} 950170530Ssam 951170530Ssamstatic void 952170530Ssamsta_update_notseen(struct sta_table *st) 953170530Ssam{ 954170530Ssam struct sta_entry *se; 955170530Ssam 956170530Ssam mtx_lock(&st->st_lock); 957170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 958170530Ssam /* 959170530Ssam * If seen the reset and don't bump the count; 960170530Ssam * otherwise bump the ``not seen'' count. Note 961170530Ssam * that this insures that stations for which we 962170530Ssam * see frames while not scanning but not during 963170530Ssam * this scan will not be penalized. 964170530Ssam */ 965170530Ssam if (se->se_seen) 966170530Ssam se->se_seen = 0; 967170530Ssam else 968170530Ssam se->se_notseen++; 969170530Ssam } 970170530Ssam mtx_unlock(&st->st_lock); 971170530Ssam} 972170530Ssam 973170530Ssamstatic void 974170530Ssamsta_dec_fails(struct sta_table *st) 975170530Ssam{ 976170530Ssam struct sta_entry *se; 977170530Ssam 978170530Ssam mtx_lock(&st->st_lock); 979170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 980170530Ssam if (se->se_fails) 981170530Ssam se->se_fails--; 982170530Ssam mtx_unlock(&st->st_lock); 983170530Ssam} 984170530Ssam 985170530Ssamstatic struct sta_entry * 986178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 987170530Ssam{ 988170530Ssam struct sta_table *st = ss->ss_priv; 989170530Ssam struct sta_entry *se, *selbs = NULL; 990170530Ssam 991178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 992170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 993170530Ssam mtx_lock(&st->st_lock); 994170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 995178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 996178354Ssam ieee80211_ies_expand(&se->base.se_ies); 997170530Ssam if (selbs == NULL) 998170530Ssam selbs = se; 999170530Ssam else if (sta_compare(se, selbs) > 0) 1000170530Ssam selbs = se; 1001170530Ssam } 1002170530Ssam } 1003170530Ssam mtx_unlock(&st->st_lock); 1004170530Ssam 1005170530Ssam return selbs; 1006170530Ssam} 1007170530Ssam 1008170530Ssam/* 1009170530Ssam * Pick an ap or ibss network to join or find a channel 1010170530Ssam * to use to start an ibss network. 1011170530Ssam */ 1012170530Ssamstatic int 1013178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1014170530Ssam{ 1015170530Ssam struct sta_table *st = ss->ss_priv; 1016170530Ssam struct sta_entry *selbs; 1017170530Ssam 1018178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1019178354Ssam ("wrong mode %u", vap->iv_opmode)); 1020170530Ssam 1021170530Ssam if (st->st_newscan) { 1022170530Ssam sta_update_notseen(st); 1023170530Ssam st->st_newscan = 0; 1024170530Ssam } 1025170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1026170530Ssam /* 1027170530Ssam * Manual/background scan, don't select+join the 1028170530Ssam * bss, just return. The scanning framework will 1029170530Ssam * handle notification that this has completed. 1030170530Ssam */ 1031170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1032170530Ssam return 1; 1033170530Ssam } 1034170530Ssam /* 1035170530Ssam * Automatic sequencing; look for a candidate and 1036170530Ssam * if found join the network. 1037170530Ssam */ 1038170530Ssam /* NB: unlocked read should be ok */ 1039170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1040178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1041170530Ssam "%s: no scan candidate\n", __func__); 1042178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1043178354Ssam return 0; 1044170530Ssamnotfound: 1045170530Ssam /* 1046170530Ssam * If nothing suitable was found decrement 1047170530Ssam * the failure counts so entries will be 1048170530Ssam * reconsidered the next time around. We 1049170530Ssam * really want to do this only for sta's 1050170530Ssam * where we've previously had some success. 1051170530Ssam */ 1052170530Ssam sta_dec_fails(st); 1053170530Ssam st->st_newscan = 1; 1054170530Ssam return 0; /* restart scan */ 1055170530Ssam } 1056178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1057178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1058178354Ssam return (selbs != NULL); 1059178354Ssam if (selbs == NULL || !ieee80211_sta_join(vap, &selbs->base)) 1060170530Ssam goto notfound; 1061170530Ssam return 1; /* terminate scan */ 1062170530Ssam} 1063170530Ssam 1064170530Ssam/* 1065170530Ssam * Lookup an entry in the scan cache. We assume we're 1066170530Ssam * called from the bottom half or such that we don't need 1067170530Ssam * to block the bottom half so that it's safe to return 1068170530Ssam * a reference to an entry w/o holding the lock on the table. 1069170530Ssam */ 1070170530Ssamstatic struct sta_entry * 1071170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1072170530Ssam{ 1073170530Ssam struct sta_entry *se; 1074170530Ssam int hash = STA_HASH(macaddr); 1075170530Ssam 1076170530Ssam mtx_lock(&st->st_lock); 1077170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1078170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1079170530Ssam break; 1080170530Ssam mtx_unlock(&st->st_lock); 1081170530Ssam 1082170530Ssam return se; /* NB: unlocked */ 1083170530Ssam} 1084170530Ssam 1085170530Ssamstatic void 1086178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1087170530Ssam{ 1088178354Ssam struct ieee80211com *ic = vap->iv_ic; 1089178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1090170530Ssam struct sta_table *st = ss->ss_priv; 1091178354Ssam enum ieee80211_phymode mode; 1092170530Ssam struct sta_entry *se, *selbs; 1093178354Ssam uint8_t roamRate, curRate, ucastRate; 1094170530Ssam int8_t roamRssi, curRssi; 1095170530Ssam 1096170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1097170530Ssam if (se == NULL) { 1098170530Ssam /* XXX something is wrong */ 1099170530Ssam return; 1100170530Ssam } 1101170530Ssam 1102178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1103178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1104178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1105178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1106170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1107170530Ssam curRssi = ic->ic_node_getrssi(ni); 1108178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1109178354Ssam curRate = ni->ni_txrate; 1110178354Ssam roamRate &= IEEE80211_RATE_VAL; 1111178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1112170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1113170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1114170530Ssam } else { 1115170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1116178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1117170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1118170530Ssam } 1119170530Ssam /* 1120170530Ssam * Check if a new ap should be used and switch. 1121170530Ssam * XXX deauth current ap 1122170530Ssam */ 1123170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1124178354Ssam if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1125170530Ssam /* 1126170530Ssam * Scan cache contents are too old; force a scan now 1127170530Ssam * if possible so we have current state to make a 1128170530Ssam * decision with. We don't kick off a bg scan if 1129170530Ssam * we're using dynamic turbo and boosted or if the 1130170530Ssam * channel is busy. 1131170530Ssam * XXX force immediate switch on scan complete 1132170530Ssam */ 1133170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1134178354Ssam time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1135178354Ssam ieee80211_bg_scan(vap, 0); 1136170530Ssam return; 1137170530Ssam } 1138170530Ssam se->base.se_rssi = curRssi; 1139178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1140170530Ssam if (selbs != NULL && selbs != se) { 1141178354Ssam IEEE80211_DPRINTF(vap, 1142170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1143170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1144170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1145170530Ssam curRate, roamRate, curRssi, roamRssi); 1146178354Ssam ieee80211_sta_join(vap, &selbs->base); 1147170530Ssam } 1148170530Ssam } 1149170530Ssam} 1150170530Ssam 1151170530Ssam/* 1152170530Ssam * Age entries in the scan cache. 1153170530Ssam * XXX also do roaming since it's convenient 1154170530Ssam */ 1155170530Ssamstatic void 1156170530Ssamsta_age(struct ieee80211_scan_state *ss) 1157170530Ssam{ 1158178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1159170530Ssam 1160178354Ssam adhoc_age(ss); 1161170530Ssam /* 1162170530Ssam * If rate control is enabled check periodically to see if 1163170530Ssam * we should roam from our current connection to one that 1164170530Ssam * might be better. This only applies when we're operating 1165170530Ssam * in sta mode and automatic roaming is set. 1166170530Ssam * XXX defer if busy 1167170530Ssam * XXX repeater station 1168170530Ssam * XXX do when !bgscan? 1169170530Ssam */ 1170178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1171178354Ssam ("wrong mode %u", vap->iv_opmode)); 1172178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1173178354Ssam (vap->iv_ic->ic_flags & IEEE80211_F_BGSCAN) && 1174178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1175170530Ssam /* XXX vap is implicit */ 1176178354Ssam sta_roam_check(ss, vap); 1177170530Ssam} 1178170530Ssam 1179170530Ssam/* 1180170530Ssam * Iterate over the entries in the scan cache, invoking 1181170530Ssam * the callback function on each one. 1182170530Ssam */ 1183170530Ssamstatic void 1184170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1185170530Ssam ieee80211_scan_iter_func *f, void *arg) 1186170530Ssam{ 1187170530Ssam struct sta_table *st = ss->ss_priv; 1188170530Ssam struct sta_entry *se; 1189170530Ssam u_int gen; 1190170530Ssam 1191170530Ssam mtx_lock(&st->st_scanlock); 1192178354Ssam gen = st->st_scaniter++; 1193170530Ssamrestart: 1194170530Ssam mtx_lock(&st->st_lock); 1195170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1196170530Ssam if (se->se_scangen != gen) { 1197170530Ssam se->se_scangen = gen; 1198170530Ssam /* update public state */ 1199170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1200170530Ssam mtx_unlock(&st->st_lock); 1201170530Ssam (*f)(arg, &se->base); 1202170530Ssam goto restart; 1203170530Ssam } 1204170530Ssam } 1205170530Ssam mtx_unlock(&st->st_lock); 1206170530Ssam 1207170530Ssam mtx_unlock(&st->st_scanlock); 1208170530Ssam} 1209170530Ssam 1210170530Ssamstatic void 1211170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1212170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1213170530Ssam{ 1214170530Ssam struct sta_table *st = ss->ss_priv; 1215170530Ssam struct sta_entry *se; 1216170530Ssam 1217170530Ssam se = sta_lookup(st, macaddr); 1218170530Ssam if (se != NULL) { 1219170530Ssam se->se_fails++; 1220170530Ssam se->se_lastfail = ticks; 1221178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1222170530Ssam macaddr, "%s: reason %u fails %u", 1223170530Ssam __func__, reason, se->se_fails); 1224170530Ssam } 1225170530Ssam} 1226170530Ssam 1227170530Ssamstatic void 1228170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1229170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1230170530Ssam{ 1231170530Ssam struct sta_table *st = ss->ss_priv; 1232170530Ssam struct sta_entry *se; 1233170530Ssam 1234170530Ssam se = sta_lookup(st, macaddr); 1235170530Ssam if (se != NULL) { 1236170530Ssam#if 0 1237170530Ssam se->se_fails = 0; 1238178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1239170530Ssam macaddr, "%s: fails %u", 1240170530Ssam __func__, se->se_fails); 1241170530Ssam#endif 1242170530Ssam se->se_lastassoc = ticks; 1243170530Ssam } 1244170530Ssam} 1245170530Ssam 1246170530Ssamstatic const struct ieee80211_scanner sta_default = { 1247170530Ssam .scan_name = "default", 1248170530Ssam .scan_attach = sta_attach, 1249170530Ssam .scan_detach = sta_detach, 1250170530Ssam .scan_start = sta_start, 1251170530Ssam .scan_restart = sta_restart, 1252170530Ssam .scan_cancel = sta_cancel, 1253170530Ssam .scan_end = sta_pick_bss, 1254170530Ssam .scan_flush = sta_flush, 1255170530Ssam .scan_add = sta_add, 1256170530Ssam .scan_age = sta_age, 1257170530Ssam .scan_iterate = sta_iterate, 1258170530Ssam .scan_assoc_fail = sta_assoc_fail, 1259170530Ssam .scan_assoc_success = sta_assoc_success, 1260170530Ssam}; 1261170530Ssam 1262170530Ssam/* 1263170530Ssam * Adhoc mode-specific support. 1264170530Ssam */ 1265170530Ssam 1266170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1267170530Ssam{ 5180, 5200, 5220, 5240 }; 1268170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1269170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1270170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1271170530Ssam{ 5170, 5190, 5210, 5230 }; 1272170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1273170530Ssam{ 2457, 2462 }; 1274170530Ssam 1275170530Ssamstatic const struct scanlist adhocScanTable[] = { 1276170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1277170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1278170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1279170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1280170530Ssam { .list = NULL } 1281170530Ssam}; 1282170530Ssam#undef X 1283170530Ssam 1284170530Ssam/* 1285170530Ssam * Start an adhoc-mode scan by populating the channel list. 1286170530Ssam */ 1287170530Ssamstatic int 1288178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1289170530Ssam{ 1290170530Ssam struct sta_table *st = ss->ss_priv; 1291170530Ssam 1292178354Ssam makescanlist(ss, vap, adhocScanTable); 1293176653Ssam 1294178354Ssam if (ss->ss_mindwell == 0) 1295178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1296178354Ssam if (ss->ss_maxdwell == 0) 1297178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1298176653Ssam 1299178354Ssam st->st_scangen++; 1300170530Ssam st->st_newscan = 1; 1301170530Ssam 1302170530Ssam return 0; 1303170530Ssam} 1304170530Ssam 1305170530Ssam/* 1306170530Ssam * Select a channel to start an adhoc network on. 1307170530Ssam * The channel list was populated with appropriate 1308170530Ssam * channels so select one that looks least occupied. 1309170530Ssam */ 1310170530Ssamstatic struct ieee80211_channel * 1311178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1312170530Ssam{ 1313170530Ssam struct sta_table *st = ss->ss_priv; 1314170530Ssam struct sta_entry *se; 1315170530Ssam struct ieee80211_channel *c, *bestchan; 1316170530Ssam int i, bestrssi, maxrssi; 1317170530Ssam 1318170530Ssam bestchan = NULL; 1319170530Ssam bestrssi = -1; 1320170530Ssam 1321170530Ssam mtx_lock(&st->st_lock); 1322170530Ssam for (i = 0; i < ss->ss_last; i++) { 1323170530Ssam c = ss->ss_chans[i]; 1324178354Ssam /* never consider a channel with radar */ 1325178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1326176653Ssam continue; 1327178354Ssam /* skip channels disallowed by regulatory settings */ 1328178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1329178354Ssam continue; 1330178354Ssam /* check channel attributes for band compatibility */ 1331178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1332178354Ssam continue; 1333170530Ssam maxrssi = 0; 1334170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1335170530Ssam if (se->base.se_chan != c) 1336170530Ssam continue; 1337170530Ssam if (se->base.se_rssi > maxrssi) 1338170530Ssam maxrssi = se->base.se_rssi; 1339170530Ssam } 1340170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1341170530Ssam bestchan = c; 1342170530Ssam } 1343170530Ssam mtx_unlock(&st->st_lock); 1344170530Ssam 1345170530Ssam return bestchan; 1346170530Ssam} 1347170530Ssam 1348170530Ssam/* 1349170530Ssam * Pick an ibss network to join or find a channel 1350170530Ssam * to use to start an ibss network. 1351170530Ssam */ 1352170530Ssamstatic int 1353178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1354170530Ssam{ 1355170530Ssam struct sta_table *st = ss->ss_priv; 1356170530Ssam struct sta_entry *selbs; 1357170530Ssam struct ieee80211_channel *chan; 1358170530Ssam 1359178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1360178354Ssam vap->iv_opmode == IEEE80211_M_AHDEMO, 1361178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1362170530Ssam 1363170530Ssam if (st->st_newscan) { 1364170530Ssam sta_update_notseen(st); 1365170530Ssam st->st_newscan = 0; 1366170530Ssam } 1367170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1368170530Ssam /* 1369170530Ssam * Manual/background scan, don't select+join the 1370170530Ssam * bss, just return. The scanning framework will 1371170530Ssam * handle notification that this has completed. 1372170530Ssam */ 1373170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1374170530Ssam return 1; 1375170530Ssam } 1376170530Ssam /* 1377170530Ssam * Automatic sequencing; look for a candidate and 1378170530Ssam * if found join the network. 1379170530Ssam */ 1380170530Ssam /* NB: unlocked read should be ok */ 1381170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1382178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1383170530Ssam "%s: no scan candidate\n", __func__); 1384178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1385178354Ssam return 0; 1386170530Ssamnotfound: 1387178354Ssam if (vap->iv_des_nssid) { 1388170530Ssam /* 1389170530Ssam * No existing adhoc network to join and we have 1390170530Ssam * an ssid; start one up. If no channel was 1391170530Ssam * specified, try to select a channel. 1392170530Ssam */ 1393178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1394178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1395183421Ssam struct ieee80211com *ic = vap->iv_ic; 1396183421Ssam 1397183421Ssam chan = adhoc_pick_channel(ss, 0); 1398183421Ssam if (chan != NULL) 1399183421Ssam chan = ieee80211_ht_adjust_channel(ic, 1400183421Ssam chan, vap->iv_flags_ext); 1401178354Ssam } else 1402178354Ssam chan = vap->iv_des_chan; 1403170530Ssam if (chan != NULL) { 1404178354Ssam ieee80211_create_ibss(vap, chan); 1405170530Ssam return 1; 1406170530Ssam } 1407170530Ssam } 1408170530Ssam /* 1409170530Ssam * If nothing suitable was found decrement 1410170530Ssam * the failure counts so entries will be 1411170530Ssam * reconsidered the next time around. We 1412170530Ssam * really want to do this only for sta's 1413170530Ssam * where we've previously had some success. 1414170530Ssam */ 1415170530Ssam sta_dec_fails(st); 1416170530Ssam st->st_newscan = 1; 1417170530Ssam return 0; /* restart scan */ 1418170530Ssam } 1419178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1420178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1421178354Ssam return (selbs != NULL); 1422178354Ssam if (selbs == NULL || !ieee80211_sta_join(vap, &selbs->base)) 1423170530Ssam goto notfound; 1424170530Ssam return 1; /* terminate scan */ 1425170530Ssam} 1426170530Ssam 1427170530Ssam/* 1428170530Ssam * Age entries in the scan cache. 1429170530Ssam */ 1430170530Ssamstatic void 1431170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1432170530Ssam{ 1433170530Ssam struct sta_table *st = ss->ss_priv; 1434170530Ssam struct sta_entry *se, *next; 1435170530Ssam 1436170530Ssam mtx_lock(&st->st_lock); 1437170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1438170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1439170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1440170530Ssam LIST_REMOVE(se, se_hash); 1441178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1442184210Sdes FREE(se, M_80211_SCAN); 1443170530Ssam } 1444170530Ssam } 1445170530Ssam mtx_unlock(&st->st_lock); 1446170530Ssam} 1447170530Ssam 1448170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1449170530Ssam .scan_name = "default", 1450170530Ssam .scan_attach = sta_attach, 1451170530Ssam .scan_detach = sta_detach, 1452170530Ssam .scan_start = adhoc_start, 1453170530Ssam .scan_restart = sta_restart, 1454170530Ssam .scan_cancel = sta_cancel, 1455170530Ssam .scan_end = adhoc_pick_bss, 1456170530Ssam .scan_flush = sta_flush, 1457178354Ssam .scan_pickchan = adhoc_pick_channel, 1458170530Ssam .scan_add = sta_add, 1459170530Ssam .scan_age = adhoc_age, 1460170530Ssam .scan_iterate = sta_iterate, 1461170530Ssam .scan_assoc_fail = sta_assoc_fail, 1462170530Ssam .scan_assoc_success = sta_assoc_success, 1463170530Ssam}; 1464170530Ssam 1465178354Ssamstatic void 1466178354Ssamap_force_promisc(struct ieee80211com *ic) 1467178354Ssam{ 1468178354Ssam struct ifnet *ifp = ic->ic_ifp; 1469178354Ssam 1470178354Ssam IEEE80211_LOCK(ic); 1471178354Ssam /* set interface into promiscuous mode */ 1472178354Ssam ifp->if_flags |= IFF_PROMISC; 1473178354Ssam ic->ic_update_promisc(ifp); 1474178354Ssam IEEE80211_UNLOCK(ic); 1475178354Ssam} 1476178354Ssam 1477178354Ssamstatic void 1478178354Ssamap_reset_promisc(struct ieee80211com *ic) 1479178354Ssam{ 1480178354Ssam IEEE80211_LOCK(ic); 1481178354Ssam ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1482178354Ssam IEEE80211_UNLOCK(ic); 1483178354Ssam} 1484178354Ssam 1485178354Ssamstatic int 1486178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1487178354Ssam{ 1488178354Ssam struct sta_table *st = ss->ss_priv; 1489178354Ssam 1490178354Ssam makescanlist(ss, vap, staScanTable); 1491178354Ssam 1492178354Ssam if (ss->ss_mindwell == 0) 1493178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1494178354Ssam if (ss->ss_maxdwell == 0) 1495178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1496178354Ssam 1497178354Ssam st->st_scangen++; 1498178354Ssam st->st_newscan = 1; 1499178354Ssam 1500178354Ssam ap_force_promisc(vap->iv_ic); 1501178354Ssam return 0; 1502178354Ssam} 1503178354Ssam 1504170530Ssam/* 1505178354Ssam * Cancel an ongoing scan. 1506170530Ssam */ 1507170530Ssamstatic int 1508178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1509170530Ssam{ 1510178354Ssam ap_reset_promisc(vap->iv_ic); 1511178354Ssam return 0; 1512178354Ssam} 1513178354Ssam 1514178354Ssam/* 1515178354Ssam * Pick a quiet channel to use for ap operation. 1516178354Ssam */ 1517178354Ssamstatic struct ieee80211_channel * 1518178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1519178354Ssam{ 1520178354Ssam struct sta_table *st = ss->ss_priv; 1521178354Ssam struct ieee80211_channel *bestchan = NULL; 1522178354Ssam int i; 1523178354Ssam 1524178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1525178354Ssam /* NB: use scan list order to preserve channel preference */ 1526178354Ssam for (i = 0; i < ss->ss_last; i++) { 1527178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1528178354Ssam /* 1529178354Ssam * If the channel is unoccupied the max rssi 1530178354Ssam * should be zero; just take it. Otherwise 1531178354Ssam * track the channel with the lowest rssi and 1532178354Ssam * use that when all channels appear occupied. 1533178354Ssam */ 1534178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1535178354Ssam continue; 1536178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1537178354Ssam continue; 1538178354Ssam /* check channel attributes for band compatibility */ 1539178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1540178354Ssam continue; 1541178354Ssam /* XXX channel have interference */ 1542178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1543178354Ssam /* XXX use other considerations */ 1544178354Ssam return chan; 1545170530Ssam } 1546178354Ssam if (bestchan == NULL || 1547178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1548178354Ssam bestchan = chan; 1549178354Ssam } 1550178354Ssam return bestchan; 1551178354Ssam} 1552178354Ssam 1553178354Ssam/* 1554178354Ssam * Pick a quiet channel to use for ap operation. 1555178354Ssam */ 1556178354Ssamstatic int 1557178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1558178354Ssam{ 1559178354Ssam struct ieee80211com *ic = vap->iv_ic; 1560178354Ssam struct ieee80211_channel *bestchan; 1561178354Ssam 1562178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1563178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1564178354Ssam bestchan = ap_pick_channel(ss, 0); 1565178354Ssam if (bestchan == NULL) { 1566178354Ssam /* no suitable channel, should not happen */ 1567178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1568178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1569178354Ssam /* XXX print something? */ 1570178354Ssam return 0; /* restart scan */ 1571178354Ssam } 1572178354Ssam /* 1573178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1574178354Ssam */ 1575178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1576178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1577178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1578178354Ssam if (bestchan == NULL) { 1579178354Ssam /* should never happen ?? */ 1580178354Ssam return 0; 1581170530Ssam } 1582170530Ssam } 1583178354Ssam ap_reset_promisc(ic); 1584178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1585178354Ssam /* 1586178354Ssam * Manual/background scan, don't select+join the 1587178354Ssam * bss, just return. The scanning framework will 1588178354Ssam * handle notification that this has completed. 1589178354Ssam */ 1590178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1591178354Ssam return 1; 1592178354Ssam } 1593178354Ssam ieee80211_create_ibss(vap, 1594178354Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ext)); 1595178354Ssam return 1; 1596170530Ssam} 1597170530Ssam 1598178354Ssamstatic const struct ieee80211_scanner ap_default = { 1599178354Ssam .scan_name = "default", 1600178354Ssam .scan_attach = sta_attach, 1601178354Ssam .scan_detach = sta_detach, 1602178354Ssam .scan_start = ap_start, 1603178354Ssam .scan_restart = sta_restart, 1604178354Ssam .scan_cancel = ap_cancel, 1605178354Ssam .scan_end = ap_end, 1606178354Ssam .scan_flush = sta_flush, 1607178354Ssam .scan_pickchan = ap_pick_channel, 1608178354Ssam .scan_add = sta_add, 1609178354Ssam .scan_age = adhoc_age, 1610178354Ssam .scan_iterate = sta_iterate, 1611178354Ssam .scan_assoc_success = sta_assoc_success, 1612178354Ssam .scan_assoc_fail = sta_assoc_fail, 1613170530Ssam}; 1614178354Ssam 1615178354Ssam/* 1616178354Ssam * Module glue. 1617178354Ssam */ 1618178354SsamIEEE80211_SCANNER_MODULE(sta, 1); 1619178354SsamIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1620178354SsamIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1621178354SsamIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1622178354SsamIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1623