ieee80211_scan_sta.c revision 330446
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: stable/11/sys/net80211/ieee80211_scan_sta.c 330446 2018-03-05 06:59:30Z eadler $"); 28170530Ssam 29170530Ssam/* 30170530Ssam * IEEE 802.11 station scanning support. 31170530Ssam */ 32178354Ssam#include "opt_wlan.h" 33178354Ssam 34170530Ssam#include <sys/param.h> 35191746Sthompsa#include <sys/systm.h> 36170530Ssam#include <sys/kernel.h> 37298359Savos#include <sys/endian.h> 38295126Sglebius#include <sys/malloc.h> 39170530Ssam#include <sys/module.h> 40191746Sthompsa 41170530Ssam#include <sys/socket.h> 42170530Ssam 43170530Ssam#include <net/if.h> 44257176Sglebius#include <net/if_var.h> 45170530Ssam#include <net/if_media.h> 46170530Ssam#include <net/ethernet.h> 47170530Ssam 48170530Ssam#include <net80211/ieee80211_var.h> 49178354Ssam#include <net80211/ieee80211_input.h> 50178354Ssam#include <net80211/ieee80211_regdomain.h> 51186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 52186904Ssam#include <net80211/ieee80211_tdma.h> 53186904Ssam#endif 54195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 55195618Srpaulo#include <net80211/ieee80211_mesh.h> 56195618Srpaulo#endif 57245928Sadrian#include <net80211/ieee80211_ratectl.h> 58170530Ssam 59170530Ssam#include <net/bpf.h> 60170530Ssam 61170530Ssam/* 62170530Ssam * Parameters for managing cache entries: 63170530Ssam * 64170530Ssam * o a station with STA_FAILS_MAX failures is not considered 65170530Ssam * when picking a candidate 66170530Ssam * o a station that hasn't had an update in STA_PURGE_SCANS 67170530Ssam * (background) scans is discarded 68170530Ssam * o after STA_FAILS_AGE seconds we clear the failure count 69170530Ssam */ 70170530Ssam#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 71170530Ssam#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 72170530Ssam#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 73170530Ssam 74170530Ssam/* XXX tunable */ 75170530Ssam#define STA_RSSI_MIN 8 /* min acceptable rssi */ 76170530Ssam#define STA_RSSI_MAX 40 /* max rssi for comparison */ 77170530Ssam 78170530Ssamstruct sta_entry { 79170530Ssam struct ieee80211_scan_entry base; 80170530Ssam TAILQ_ENTRY(sta_entry) se_list; 81170530Ssam LIST_ENTRY(sta_entry) se_hash; 82170530Ssam uint8_t se_fails; /* failure to associate count */ 83170530Ssam uint8_t se_seen; /* seen during current scan */ 84170530Ssam uint8_t se_notseen; /* not seen in previous scans */ 85170530Ssam uint8_t se_flags; 86184302Ssam#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 87170530Ssam uint32_t se_avgrssi; /* LPF rssi state */ 88170530Ssam unsigned long se_lastupdate; /* time of last update */ 89170530Ssam unsigned long se_lastfail; /* time of last failure */ 90170530Ssam unsigned long se_lastassoc; /* time of last association */ 91170530Ssam u_int se_scangen; /* iterator scan gen# */ 92178354Ssam u_int se_countrygen; /* gen# of last cc notify */ 93170530Ssam}; 94170530Ssam 95170530Ssam#define STA_HASHSIZE 32 96170530Ssam/* simple hash is enough for variation of macaddr */ 97170530Ssam#define STA_HASH(addr) \ 98170530Ssam (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 99170530Ssam 100186107Ssam#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 101186107SsamCTASSERT(MAX_IEEE_CHAN >= 256); 102186107Ssam 103170530Ssamstruct sta_table { 104206617Srpaulo ieee80211_scan_table_lock_t st_lock; /* on scan table */ 105170530Ssam TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 106170530Ssam LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 107283556Sadrian ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */ 108178354Ssam u_int st_scaniter; /* gen# for iterator */ 109178354Ssam u_int st_scangen; /* scan generation # */ 110170530Ssam int st_newscan; 111178354Ssam /* ap-related state */ 112186107Ssam int st_maxrssi[MAX_IEEE_CHAN]; 113170530Ssam}; 114170530Ssam 115170530Ssamstatic void sta_flush_table(struct sta_table *); 116171409Ssam/* 117171409Ssam * match_bss returns a bitmask describing if an entry is suitable 118171409Ssam * for use. If non-zero the entry was deemed not suitable and it's 119330446Seadler * contents explains why. The following flags are or'd to this 120171409Ssam * mask and can be used to figure out why the entry was rejected. 121171409Ssam */ 122195618Srpaulo#define MATCH_CHANNEL 0x00001 /* channel mismatch */ 123195618Srpaulo#define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 124195618Srpaulo#define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 125195618Srpaulo#define MATCH_RATE 0x00008 /* rate set mismatch */ 126195618Srpaulo#define MATCH_SSID 0x00010 /* ssid mismatch */ 127195618Srpaulo#define MATCH_BSSID 0x00020 /* bssid mismatch */ 128195618Srpaulo#define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 129195618Srpaulo#define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 130195618Srpaulo#define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 131195618Srpaulo#define MATCH_CC 0x00200 /* country code mismatch */ 132300232Savos#ifdef IEEE80211_SUPPORT_TDMA 133195618Srpaulo#define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 134195618Srpaulo#define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 135195618Srpaulo#define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 136195618Srpaulo#define MATCH_TDMA_LOCAL 0x02000 /* local address */ 137195618Srpaulo#define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 138300232Savos#endif 139195618Srpaulo#define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 140195618Srpaulo#define MATCH_MESHID 0x20000 /* meshid mismatch */ 141178354Ssamstatic int match_bss(struct ieee80211vap *, 142170530Ssam const struct ieee80211_scan_state *, struct sta_entry *, int); 143178354Ssamstatic void adhoc_age(struct ieee80211_scan_state *); 144170530Ssam 145178354Ssamstatic __inline int 146178354Ssamisocmp(const uint8_t cc1[], const uint8_t cc2[]) 147178354Ssam{ 148178354Ssam return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 149178354Ssam} 150178354Ssam 151170530Ssam/* number of references from net80211 layer */ 152170530Ssamstatic int nrefs = 0; 153195618Srpaulo/* 154195618Srpaulo * Module glue. 155195618Srpaulo */ 156195618SrpauloIEEE80211_SCANNER_MODULE(sta, 1); 157170530Ssam 158170530Ssam/* 159170530Ssam * Attach prior to any scanning work. 160170530Ssam */ 161170530Ssamstatic int 162170530Ssamsta_attach(struct ieee80211_scan_state *ss) 163170530Ssam{ 164170530Ssam struct sta_table *st; 165170530Ssam 166283538Sadrian st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table), 167283538Sadrian M_80211_SCAN, 168283538Sadrian IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 169170530Ssam if (st == NULL) 170170530Ssam return 0; 171206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 172283556Sadrian IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen"); 173170530Ssam TAILQ_INIT(&st->st_entry); 174170530Ssam ss->ss_priv = st; 175170530Ssam nrefs++; /* NB: we assume caller locking */ 176170530Ssam return 1; 177170530Ssam} 178170530Ssam 179170530Ssam/* 180170530Ssam * Cleanup any private state. 181170530Ssam */ 182170530Ssamstatic int 183170530Ssamsta_detach(struct ieee80211_scan_state *ss) 184170530Ssam{ 185170530Ssam struct sta_table *st = ss->ss_priv; 186170530Ssam 187170530Ssam if (st != NULL) { 188170530Ssam sta_flush_table(st); 189206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 190283556Sadrian IEEE80211_SCAN_ITER_LOCK_DESTROY(st); 191283538Sadrian IEEE80211_FREE(st, M_80211_SCAN); 192170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 193170530Ssam nrefs--; /* NB: we assume caller locking */ 194170530Ssam } 195170530Ssam return 1; 196170530Ssam} 197170530Ssam 198170530Ssam/* 199170530Ssam * Flush all per-scan state. 200170530Ssam */ 201170530Ssamstatic int 202170530Ssamsta_flush(struct ieee80211_scan_state *ss) 203170530Ssam{ 204170530Ssam struct sta_table *st = ss->ss_priv; 205170530Ssam 206206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 207170530Ssam sta_flush_table(st); 208206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 209170530Ssam ss->ss_last = 0; 210170530Ssam return 0; 211170530Ssam} 212170530Ssam 213170530Ssam/* 214170530Ssam * Flush all entries in the scan cache. 215170530Ssam */ 216170530Ssamstatic void 217170530Ssamsta_flush_table(struct sta_table *st) 218170530Ssam{ 219170530Ssam struct sta_entry *se, *next; 220170530Ssam 221170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 222170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 223170530Ssam LIST_REMOVE(se, se_hash); 224178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 225283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 226170530Ssam } 227178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 228170530Ssam} 229170530Ssam 230170530Ssam/* 231170530Ssam * Process a beacon or probe response frame; create an 232170530Ssam * entry in the scan cache or update any previous entry. 233170530Ssam */ 234170530Ssamstatic int 235170530Ssamsta_add(struct ieee80211_scan_state *ss, 236282742Sadrian struct ieee80211_channel *curchan, 237170530Ssam const struct ieee80211_scanparams *sp, 238170530Ssam const struct ieee80211_frame *wh, 239192468Ssam int subtype, int rssi, int noise) 240170530Ssam{ 241170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 242170530Ssam#define PICK1ST(_ss) \ 243170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 244170530Ssam IEEE80211_SCAN_PICK1ST) 245170530Ssam struct sta_table *st = ss->ss_priv; 246170530Ssam const uint8_t *macaddr = wh->i_addr2; 247178354Ssam struct ieee80211vap *vap = ss->ss_vap; 248178354Ssam struct ieee80211com *ic = vap->iv_ic; 249224717Sbschmidt struct ieee80211_channel *c; 250170530Ssam struct sta_entry *se; 251170530Ssam struct ieee80211_scan_entry *ise; 252178354Ssam int hash; 253170530Ssam 254170530Ssam hash = STA_HASH(macaddr); 255170530Ssam 256206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 257170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 258170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 259170530Ssam goto found; 260283538Sadrian se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry), 261283538Sadrian M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 262170530Ssam if (se == NULL) { 263206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 264170530Ssam return 0; 265170530Ssam } 266178354Ssam se->se_scangen = st->st_scaniter-1; 267178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 268170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 269170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 270170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 271170530Ssamfound: 272170530Ssam ise = &se->base; 273170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 274170530Ssam if (sp->ssid[1] != 0 && 275170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 276170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 277170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 278170530Ssam ("rate set too large: %u", sp->rates[1])); 279170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 280170530Ssam if (sp->xrates != NULL) { 281170530Ssam /* XXX validate xrates[1] */ 282178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 283170530Ssam ("xrate set too large: %u", sp->xrates[1])); 284170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 285170530Ssam } else 286170530Ssam ise->se_xrates[1] = 0; 287170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 288178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 289173368Ssam /* 290173368Ssam * Record rssi data using extended precision LPF filter. 291173368Ssam * 292173368Ssam * NB: use only on-channel data to insure we get a good 293173368Ssam * estimate of the signal we'll see when associated. 294173368Ssam */ 295178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 296178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 297173368Ssam ise->se_noise = noise; 298173368Ssam } 299170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 300170530Ssam ise->se_intval = sp->bintval; 301170530Ssam ise->se_capinfo = sp->capinfo; 302195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 303195618Srpaulo if (sp->meshid != NULL && sp->meshid[1] != 0) 304195618Srpaulo memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 305195618Srpaulo#endif 306173368Ssam /* 307173368Ssam * Beware of overriding se_chan for frames seen 308173368Ssam * off-channel; this can cause us to attempt an 309178354Ssam * association on the wrong channel. 310173368Ssam */ 311178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 312173368Ssam /* 313173862Ssam * Off-channel, locate the home/bss channel for the sta 314178354Ssam * using the value broadcast in the DSPARMS ie. We know 315178354Ssam * sp->chan has this value because it's used to calculate 316178354Ssam * IEEE80211_BPARSE_OFFCHAN. 317173368Ssam */ 318178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 319282742Sadrian curchan->ic_flags); 320173956Ssam if (c != NULL) { 321173956Ssam ise->se_chan = c; 322173956Ssam } else if (ise->se_chan == NULL) { 323173862Ssam /* should not happen, pick something */ 324282742Sadrian ise->se_chan = curchan; 325173862Ssam } 326173862Ssam } else 327282742Sadrian ise->se_chan = curchan; 328224717Sbschmidt if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 329224717Sbschmidt /* Demote legacy networks to a non-HT channel. */ 330224717Sbschmidt c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 331224717Sbschmidt ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 332224717Sbschmidt KASSERT(c != NULL, 333224717Sbschmidt ("no legacy channel %u", ise->se_chan->ic_ieee)); 334224717Sbschmidt ise->se_chan = c; 335224717Sbschmidt } 336170530Ssam ise->se_fhdwell = sp->fhdwell; 337170530Ssam ise->se_fhindex = sp->fhindex; 338170530Ssam ise->se_erp = sp->erp; 339170530Ssam ise->se_timoff = sp->timoff; 340170530Ssam if (sp->tim != NULL) { 341170530Ssam const struct ieee80211_tim_ie *tim = 342170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 343170530Ssam ise->se_dtimperiod = tim->tim_period; 344170530Ssam } 345178354Ssam if (sp->country != NULL) { 346178354Ssam const struct ieee80211_country_ie *cie = 347178354Ssam (const struct ieee80211_country_ie *) sp->country; 348178354Ssam /* 349178354Ssam * If 11d is enabled and we're attempting to join a bss 350178354Ssam * that advertises it's country code then compare our 351178354Ssam * current settings to what we fetched from the country ie. 352178354Ssam * If our country code is unspecified or different then 353178354Ssam * dispatch an event to user space that identifies the 354178354Ssam * country code so our regdomain config can be changed. 355178354Ssam */ 356178354Ssam /* XXX only for STA mode? */ 357178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 358178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 359178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 360178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 361178354Ssam /* only issue one notify event per scan */ 362178354Ssam if (se->se_countrygen != st->st_scangen) { 363178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 364178354Ssam cie->cc); 365178354Ssam se->se_countrygen = st->st_scangen; 366178354Ssam } 367178354Ssam } 368178354Ssam ise->se_cc[0] = cie->cc[0]; 369178354Ssam ise->se_cc[1] = cie->cc[1]; 370178354Ssam } 371178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 372178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 373170530Ssam 374170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 375170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 376170530Ssam se->se_fails = 0; 377178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 378170530Ssam "%s: fails %u", __func__, se->se_fails); 379170530Ssam } 380170530Ssam 381170530Ssam se->se_lastupdate = ticks; /* update time */ 382170530Ssam se->se_seen = 1; 383170530Ssam se->se_notseen = 0; 384170530Ssam 385186107Ssam KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 386178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 387178354Ssam st->st_maxrssi[sp->bchan] = rssi; 388178354Ssam 389206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 390170530Ssam 391170530Ssam /* 392170530Ssam * If looking for a quick choice and nothing's 393170530Ssam * been found check here. 394170530Ssam */ 395178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 396170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 397170530Ssam 398170530Ssam return 1; 399170530Ssam#undef PICK1ST 400170530Ssam#undef ISPROBE 401170530Ssam} 402170530Ssam 403170530Ssam/* 404170530Ssam * Check if a channel is excluded by user request. 405170530Ssam */ 406170530Ssamstatic int 407178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 408170530Ssam{ 409178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 410178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 411178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 412170530Ssam} 413170530Ssam 414170530Ssamstatic struct ieee80211_channel * 415170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 416170530Ssam{ 417170530Ssam struct ieee80211_channel *c; 418170530Ssam int j; 419170530Ssam 420170530Ssam /* 421170530Ssam * The normal ordering in the channel list is b channel 422170530Ssam * immediately followed by g so optimize the search for 423170530Ssam * this. We'll still do a full search just in case. 424170530Ssam */ 425170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 426170530Ssam c = &ic->ic_channels[j]; 427187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 428170530Ssam return c; 429170530Ssam } 430170530Ssam for (j = 0; j < i; j++) { 431170530Ssam c = &ic->ic_channels[j]; 432187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 433170530Ssam return c; 434170530Ssam } 435170530Ssam return NULL; 436170530Ssam} 437188777Ssam 438170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 439188777Ssam [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 440188777Ssam [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 441188777Ssam [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 442188777Ssam [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 443188777Ssam [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 444188777Ssam /* check base channel */ 445188777Ssam [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 446188777Ssam [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 447188777Ssam [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 448188782Ssam [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 449188782Ssam [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 450188777Ssam /* check legacy */ 451188777Ssam [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 452188777Ssam [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 453170530Ssam}; 454170530Ssam 455170530Ssamstatic void 456178354Ssamadd_channels(struct ieee80211vap *vap, 457170530Ssam struct ieee80211_scan_state *ss, 458170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 459170530Ssam{ 460178354Ssam struct ieee80211com *ic = vap->iv_ic; 461170530Ssam struct ieee80211_channel *c, *cg; 462170530Ssam u_int modeflags; 463170530Ssam int i; 464170530Ssam 465254315Srpaulo KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 466170530Ssam modeflags = chanflags[mode]; 467170530Ssam for (i = 0; i < nfreq; i++) { 468170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 469170530Ssam break; 470170530Ssam 471170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 472178354Ssam if (c == NULL || isexcluded(vap, c)) 473170530Ssam continue; 474170530Ssam if (mode == IEEE80211_MODE_AUTO) { 475170530Ssam /* 476170530Ssam * XXX special-case 11b/g channels so we select 477178354Ssam * the g channel if both are present. 478170530Ssam */ 479178354Ssam if (IEEE80211_IS_CHAN_B(c) && 480178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 481178354Ssam c = cg; 482170530Ssam } 483170530Ssam ss->ss_chans[ss->ss_last++] = c; 484170530Ssam } 485170530Ssam} 486170530Ssam 487170530Ssamstruct scanlist { 488170530Ssam uint16_t mode; 489170530Ssam uint16_t count; 490170530Ssam const uint16_t *list; 491170530Ssam}; 492170530Ssam 493170530Ssamstatic int 494170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 495170530Ssam{ 496170530Ssam int i; 497170530Ssam 498170530Ssam for (; scan->list != NULL; scan++) { 499170530Ssam for (i = 0; i < scan->count; i++) 500170530Ssam if (scan->list[i] == c->ic_freq) 501170530Ssam return 1; 502170530Ssam } 503170530Ssam return 0; 504170530Ssam} 505170530Ssam 506189377Ssamstatic int 507189377Ssamonscanlist(const struct ieee80211_scan_state *ss, 508189377Ssam const struct ieee80211_channel *c) 509189377Ssam{ 510189377Ssam int i; 511189377Ssam 512189377Ssam for (i = 0; i < ss->ss_last; i++) 513189377Ssam if (ss->ss_chans[i] == c) 514189377Ssam return 1; 515189377Ssam return 0; 516189377Ssam} 517189377Ssam 518176653Ssamstatic void 519178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 520176653Ssam const struct scanlist table[]) 521176653Ssam{ 522178354Ssam struct ieee80211com *ic = vap->iv_ic; 523176653Ssam struct ieee80211_channel *c; 524176653Ssam int i; 525176653Ssam 526176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 527176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 528176653Ssam break; 529176653Ssam 530176653Ssam c = &ic->ic_channels[i]; 531176653Ssam /* 532176653Ssam * Ignore dynamic turbo channels; we scan them 533176653Ssam * in normal mode (i.e. not boosted). Likewise 534176653Ssam * for HT channels, they get scanned using 535176653Ssam * legacy rates. 536176653Ssam */ 537176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 538176653Ssam continue; 539176653Ssam 540176653Ssam /* 541176653Ssam * If a desired mode was specified, scan only 542176653Ssam * channels that satisfy that constraint. 543176653Ssam */ 544178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 545178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 546176653Ssam continue; 547176653Ssam 548176653Ssam /* 549176653Ssam * Skip channels excluded by user request. 550176653Ssam */ 551178354Ssam if (isexcluded(vap, c)) 552176653Ssam continue; 553176653Ssam 554176653Ssam /* 555176653Ssam * Add the channel unless it is listed in the 556176653Ssam * fixed scan order tables. This insures we 557176653Ssam * don't sweep back in channels we filtered out 558176653Ssam * above. 559176653Ssam */ 560176653Ssam if (checktable(table, c)) 561176653Ssam continue; 562176653Ssam 563176653Ssam /* Add channel to scanning list. */ 564176653Ssam ss->ss_chans[ss->ss_last++] = c; 565176653Ssam } 566189377Ssam /* 567189377Ssam * Explicitly add any desired channel if: 568189377Ssam * - not already on the scan list 569189377Ssam * - allowed by any desired mode constraint 570189377Ssam * - there is space in the scan list 571189377Ssam * This allows the channel to be used when the filtering 572189377Ssam * mechanisms would otherwise elide it (e.g HT, turbo). 573189377Ssam */ 574189377Ssam c = vap->iv_des_chan; 575189377Ssam if (c != IEEE80211_CHAN_ANYC && 576189377Ssam !onscanlist(ss, c) && 577189377Ssam (vap->iv_des_mode == IEEE80211_MODE_AUTO || 578189377Ssam vap->iv_des_mode == ieee80211_chan2mode(c)) && 579189377Ssam ss->ss_last < IEEE80211_SCAN_MAX) 580189377Ssam ss->ss_chans[ss->ss_last++] = c; 581176653Ssam} 582176653Ssam 583178354Ssamstatic void 584178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 585178354Ssam const struct scanlist table[]) 586170530Ssam{ 587170530Ssam const struct scanlist *scan; 588170530Ssam enum ieee80211_phymode mode; 589170530Ssam 590170530Ssam ss->ss_last = 0; 591170530Ssam /* 592170530Ssam * Use the table of ordered channels to construct the list 593170530Ssam * of channels for scanning. Any channels in the ordered 594170530Ssam * list not in the master list will be discarded. 595170530Ssam */ 596178354Ssam for (scan = table; scan->list != NULL; scan++) { 597170530Ssam mode = scan->mode; 598178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 599170530Ssam /* 600170530Ssam * If a desired mode was specified, scan only 601170530Ssam * channels that satisfy that constraint. 602170530Ssam */ 603178354Ssam if (vap->iv_des_mode != mode) { 604170530Ssam /* 605170530Ssam * The scan table marks 2.4Ghz channels as b 606170530Ssam * so if the desired mode is 11g, then use 607170530Ssam * the 11b channel list but upgrade the mode. 608170530Ssam */ 609275875Sadrian if (vap->iv_des_mode == IEEE80211_MODE_11G) { 610275875Sadrian if (mode == IEEE80211_MODE_11G) /* Skip the G check */ 611275875Sadrian continue; 612275875Sadrian else if (mode == IEEE80211_MODE_11B) 613275875Sadrian mode = IEEE80211_MODE_11G; /* upgrade */ 614275875Sadrian } 615170530Ssam } 616170530Ssam } else { 617170530Ssam /* 618170530Ssam * This lets add_channels upgrade an 11b channel 619170530Ssam * to 11g if available. 620170530Ssam */ 621170530Ssam if (mode == IEEE80211_MODE_11B) 622170530Ssam mode = IEEE80211_MODE_AUTO; 623170530Ssam } 624170530Ssam#ifdef IEEE80211_F_XR 625170530Ssam /* XR does not operate on turbo channels */ 626178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 627170530Ssam (mode == IEEE80211_MODE_TURBO_A || 628170530Ssam mode == IEEE80211_MODE_TURBO_G || 629170530Ssam mode == IEEE80211_MODE_STURBO_A)) 630170530Ssam continue; 631170530Ssam#endif 632170530Ssam /* 633170530Ssam * Add the list of the channels; any that are not 634170530Ssam * in the master channel list will be discarded. 635170530Ssam */ 636178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 637170530Ssam } 638170530Ssam 639170530Ssam /* 640178354Ssam * Add the channels from the ic that are not present 641178354Ssam * in the table. 642170530Ssam */ 643178354Ssam sweepchannels(ss, vap, table); 644178354Ssam} 645170530Ssam 646178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 647178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 648178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 649178354Ssam{ 5170, 5190, 5210, 5230 }; 650178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 651178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 652178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 653178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 654178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 655178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 656178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 657178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 658178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 659178354Ssam{ 2484 }; 660178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 661178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 662178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 663178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 664178354Ssam#ifdef ATH_TURBO_SCAN 665178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 666178354Ssam{ 5210, 5250, 5290 }; 667178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 668178354Ssam{ 5760, 5800 }; 669178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 670178354Ssam{ 5540, 5580, 5620, 5660 }; 671178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 672178354Ssam{ 2437 }; 673178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 674178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 675178354Ssam#endif /* ATH_TURBO_SCAN */ 676170530Ssam 677178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 678170530Ssam 679178354Ssamstatic const struct scanlist staScanTable[] = { 680178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 681178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 682178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 683178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 684178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 685178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 686178354Ssam#ifdef ATH_TURBO_SCAN 687178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 688178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 689178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 690178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 691178354Ssam#endif /* ATH_TURBO_SCAN */ 692178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 693178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 694178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 695178354Ssam#ifdef ATH_TURBO_SCAN 696178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 697178354Ssam#endif /* ATH_TURBO_SCAN */ 698178354Ssam { .list = NULL } 699178354Ssam}; 700178354Ssam 701178354Ssam/* 702178354Ssam * Start a station-mode scan by populating the channel list. 703178354Ssam */ 704178354Ssamstatic int 705178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 706178354Ssam{ 707178354Ssam struct sta_table *st = ss->ss_priv; 708178354Ssam 709178354Ssam makescanlist(ss, vap, staScanTable); 710178354Ssam 711178354Ssam if (ss->ss_mindwell == 0) 712178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 713178354Ssam if (ss->ss_maxdwell == 0) 714178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 715178354Ssam 716178354Ssam st->st_scangen++; 717170530Ssam st->st_newscan = 1; 718170530Ssam 719170530Ssam return 0; 720170530Ssam} 721170530Ssam 722170530Ssam/* 723178354Ssam * Restart a scan, typically a bg scan but can 724178354Ssam * also be a fg scan that came up empty. 725170530Ssam */ 726170530Ssamstatic int 727178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 728170530Ssam{ 729170530Ssam struct sta_table *st = ss->ss_priv; 730170530Ssam 731170530Ssam st->st_newscan = 1; 732170530Ssam return 0; 733170530Ssam} 734170530Ssam 735170530Ssam/* 736170530Ssam * Cancel an ongoing scan. 737170530Ssam */ 738170530Ssamstatic int 739178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 740170530Ssam{ 741170530Ssam return 0; 742170530Ssam} 743170530Ssam 744184302Ssam/* 745184302Ssam * Demote any supplied 11g channel to 11b. There should 746184302Ssam * always be an 11b channel but we check anyway... 747184302Ssam */ 748184302Ssamstatic struct ieee80211_channel * 749184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 750184302Ssam{ 751184302Ssam struct ieee80211_channel *c; 752178354Ssam 753184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 754184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 755184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 756184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 757184302Ssam IEEE80211_CHAN_B); 758184302Ssam if (c != NULL) 759184302Ssam chan = c; 760184302Ssam } 761184302Ssam return chan; 762184302Ssam} 763184302Ssam 764178354Ssamstatic int 765170530Ssammaxrate(const struct ieee80211_scan_entry *se) 766170530Ssam{ 767178354Ssam const struct ieee80211_ie_htcap *htcap = 768178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 769219601Sbschmidt int rmax, r, i, txstream; 770178354Ssam uint16_t caps; 771219601Sbschmidt uint8_t txparams; 772170530Ssam 773170530Ssam rmax = 0; 774178354Ssam if (htcap != NULL) { 775178354Ssam /* 776178354Ssam * HT station; inspect supported MCS and then adjust 777219601Sbschmidt * rate by channel width. 778178354Ssam */ 779219601Sbschmidt txparams = htcap->hc_mcsset[12]; 780219601Sbschmidt if (txparams & 0x3) { 781219601Sbschmidt /* 782219601Sbschmidt * TX MCS parameters defined and not equal to RX, 783219601Sbschmidt * extract the number of spartial streams and 784219601Sbschmidt * map it to the highest MCS rate. 785219601Sbschmidt */ 786219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 787219601Sbschmidt i = txstream * 8 - 1; 788219601Sbschmidt } else 789219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 790178354Ssam if (i >= 0) { 791298359Savos caps = le16dec(&htcap->hc_cap); 792219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 793219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 794178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 795219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 796219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 797219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 798219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 799178354Ssam else 800219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 801178354Ssam } 802178354Ssam } 803170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 804170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 805170530Ssam if (r > rmax) 806170530Ssam rmax = r; 807170530Ssam } 808170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 809170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 810170530Ssam if (r > rmax) 811170530Ssam rmax = r; 812170530Ssam } 813170530Ssam return rmax; 814170530Ssam} 815170530Ssam 816170530Ssam/* 817170530Ssam * Compare the capabilities of two entries and decide which is 818170530Ssam * more desirable (return >0 if a is considered better). Note 819170530Ssam * that we assume compatibility/usability has already been checked 820170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 821170530Ssam * Used to select the best scan candidate for association in a BSS. 822170530Ssam */ 823170530Ssamstatic int 824170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 825170530Ssam{ 826170530Ssam#define PREFER(_a,_b,_what) do { \ 827170530Ssam if (((_a) ^ (_b)) & (_what)) \ 828170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 829170530Ssam} while (0) 830178354Ssam int maxa, maxb; 831170530Ssam int8_t rssia, rssib; 832170530Ssam int weight; 833170530Ssam 834170530Ssam /* privacy support */ 835170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 836170530Ssam IEEE80211_CAPINFO_PRIVACY); 837170530Ssam 838170530Ssam /* compare count of previous failures */ 839170530Ssam weight = b->se_fails - a->se_fails; 840170530Ssam if (abs(weight) > 1) 841170530Ssam return weight; 842170530Ssam 843170530Ssam /* 844170530Ssam * Compare rssi. If the two are considered equivalent 845170530Ssam * then fallback to other criteria. We threshold the 846170530Ssam * comparisons to avoid selecting an ap purely by rssi 847170530Ssam * when both values may be good but one ap is otherwise 848170530Ssam * more desirable (e.g. an 11b-only ap with stronger 849170530Ssam * signal than an 11g ap). 850170530Ssam */ 851170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 852170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 853170530Ssam if (abs(rssib - rssia) < 5) { 854170530Ssam /* best/max rate preferred if signal level close enough XXX */ 855170530Ssam maxa = maxrate(&a->base); 856170530Ssam maxb = maxrate(&b->base); 857170530Ssam if (maxa != maxb) 858170530Ssam return maxa - maxb; 859170530Ssam /* XXX use freq for channel preference */ 860170530Ssam /* for now just prefer 5Ghz band to all other bands */ 861178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 862178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 863170530Ssam } 864170530Ssam /* all things being equal, use signal level */ 865170530Ssam return a->base.se_rssi - b->base.se_rssi; 866170530Ssam#undef PREFER 867170530Ssam} 868170530Ssam 869170530Ssam/* 870170530Ssam * Check rate set suitability and return the best supported rate. 871178354Ssam * XXX inspect MCS for HT 872170530Ssam */ 873170530Ssamstatic int 874184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 875184302Ssam const struct ieee80211_scan_entry *se) 876170530Ssam{ 877170530Ssam const struct ieee80211_rateset *srs; 878178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 879170530Ssam const uint8_t *rs; 880170530Ssam 881178354Ssam okrate = badrate = 0; 882170530Ssam 883184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 884170530Ssam nrs = se->se_rates[1]; 885170530Ssam rs = se->se_rates+2; 886178354Ssam /* XXX MCS */ 887184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 888170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 889170530Ssamagain: 890170530Ssam for (i = 0; i < nrs; i++) { 891288086Sadrian r = IEEE80211_RV(rs[i]); 892170530Ssam badrate = r; 893170530Ssam /* 894170530Ssam * Check any fixed rate is included. 895170530Ssam */ 896178354Ssam if (r == ucastrate) 897170530Ssam fixedrate = r; 898170530Ssam /* 899170530Ssam * Check against our supported rates. 900170530Ssam */ 901170530Ssam for (j = 0; j < srs->rs_nrates; j++) 902288086Sadrian if (r == IEEE80211_RV(srs->rs_rates[j])) { 903170530Ssam if (r > okrate) /* NB: track max */ 904170530Ssam okrate = r; 905170530Ssam break; 906170530Ssam } 907170530Ssam 908170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 909170530Ssam /* 910170530Ssam * Don't try joining a BSS, if we don't support 911170530Ssam * one of its basic rates. 912170530Ssam */ 913170530Ssam okrate = 0; 914170530Ssam goto back; 915170530Ssam } 916170530Ssam } 917170530Ssam if (rs == se->se_rates+2) { 918170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 919170530Ssam nrs = se->se_xrates[1]; 920170530Ssam rs = se->se_xrates+2; 921170530Ssam goto again; 922170530Ssam } 923170530Ssam 924170530Ssamback: 925178354Ssam if (okrate == 0 || ucastrate != fixedrate) 926170530Ssam return badrate | IEEE80211_RATE_BASIC; 927170530Ssam else 928288086Sadrian return IEEE80211_RV(okrate); 929170530Ssam} 930170530Ssam 931195618Srpaulostatic __inline int 932195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 933195618Srpaulo{ 934195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 935195618Srpaulo} 936195618Srpaulo 937170530Ssamstatic int 938170530Ssammatch_ssid(const uint8_t *ie, 939170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 940170530Ssam{ 941170530Ssam int i; 942170530Ssam 943170530Ssam for (i = 0; i < nssid; i++) { 944195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 945170530Ssam return 1; 946170530Ssam } 947170530Ssam return 0; 948170530Ssam} 949170530Ssam 950186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 951186904Ssamstatic int 952186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 953186904Ssam{ 954186904Ssam int slot, slotcnt; 955186904Ssam 956186904Ssam slotcnt = tdma->tdma_slotcnt; 957186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 958186904Ssam if (isclr(tdma->tdma_inuse, slot)) 959186904Ssam return 0; 960186904Ssam return 1; 961186904Ssam} 962186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 963186904Ssam 964170530Ssam/* 965170530Ssam * Test a scan candidate for suitability/compatibility. 966170530Ssam */ 967170530Ssamstatic int 968178354Ssammatch_bss(struct ieee80211vap *vap, 969170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 970170530Ssam int debug) 971170530Ssam{ 972178354Ssam struct ieee80211com *ic = vap->iv_ic; 973170530Ssam struct ieee80211_scan_entry *se = &se0->base; 974178354Ssam uint8_t rate; 975178354Ssam int fail; 976170530Ssam 977170530Ssam fail = 0; 978170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 979171409Ssam fail |= MATCH_CHANNEL; 980170530Ssam /* 981170530Ssam * NB: normally the desired mode is used to construct 982170530Ssam * the channel list, but it's possible for the scan 983170530Ssam * cache to include entries for stations outside this 984170530Ssam * list so we check the desired mode here to weed them 985170530Ssam * out. 986170530Ssam */ 987178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 988170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 989178354Ssam chanflags[vap->iv_des_mode]) 990171409Ssam fail |= MATCH_CHANNEL; 991178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 992170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 993171409Ssam fail |= MATCH_CAPINFO; 994186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 995186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 996186904Ssam /* 997186904Ssam * Adhoc demo network setup shouldn't really be scanning 998186904Ssam * but just in case skip stations operating in IBSS or 999186904Ssam * BSS mode. 1000186904Ssam */ 1001186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1002186904Ssam fail |= MATCH_CAPINFO; 1003186904Ssam /* 1004186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1005186904Ssam * skip if IBSS or ESS capabilities are marked and require 1006186904Ssam * the beacon have a TDMA ie present. 1007186904Ssam */ 1008186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1009186904Ssam const struct ieee80211_tdma_param *tdma = 1010186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1011189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1012186904Ssam 1013186904Ssam if (tdma == NULL) 1014186904Ssam fail |= MATCH_TDMA_NOIE; 1015189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1016189980Ssam fail |= MATCH_TDMA_VERSION; 1017186904Ssam else if (tdma->tdma_slot != 0) 1018186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1019186904Ssam else if (tdma_isfull(tdma)) 1020186904Ssam fail |= MATCH_TDMA_NOSLOT; 1021186904Ssam#if 0 1022186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1023186904Ssam fail |= MATCH_TDMA_LOCAL; 1024186904Ssam#endif 1025186904Ssam } 1026186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1027195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1028195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1029195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1030195618Srpaulo /* 1031195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1032195618Srpaulo * and two special ie's that must be present. 1033195618Srpaulo */ 1034195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1035195618Srpaulo fail |= MATCH_CAPINFO; 1036215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1037195618Srpaulo fail |= MATCH_MESH_NOID; 1038195618Srpaulo else if (ms->ms_idlen != 0 && 1039195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1040195618Srpaulo fail |= MATCH_MESHID; 1041196005Ssam#endif 1042170530Ssam } else { 1043170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1044171409Ssam fail |= MATCH_CAPINFO; 1045178354Ssam /* 1046178354Ssam * If 11d is enabled and we're attempting to join a bss 1047178354Ssam * that advertises it's country code then compare our 1048178354Ssam * current settings to what we fetched from the country ie. 1049178354Ssam * If our country code is unspecified or different then do 1050178354Ssam * not attempt to join the bss. We should have already 1051178354Ssam * dispatched an event to user space that identifies the 1052178354Ssam * new country code so our regdomain config should match. 1053178354Ssam */ 1054178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1055178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1056178354Ssam se->se_cc[0] != 0 && 1057178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1058178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1059178354Ssam fail |= MATCH_CC; 1060170530Ssam } 1061178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1062170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1063171409Ssam fail |= MATCH_PRIVACY; 1064170530Ssam } else { 1065170530Ssam /* XXX does this mean privacy is supported or required? */ 1066170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1067171409Ssam fail |= MATCH_PRIVACY; 1068170530Ssam } 1069184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1070184302Ssam rate = check_rate(vap, se->se_chan, se); 1071184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1072171409Ssam fail |= MATCH_RATE; 1073184302Ssam /* 1074184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1075184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1076184302Ssam * in the scan list to 11b and retry the rate check. 1077184302Ssam */ 1078184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1079184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1080184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1081184302Ssam fail &= ~MATCH_RATE; 1082184302Ssam se0->se_flags |= STA_DEMOTE11B; 1083184302Ssam } 1084184302Ssam } 1085184302Ssam } else if (rate < 2*24) { 1086184302Ssam /* 1087184302Ssam * This is an 11b-only ap. Check the desired mode in 1088184302Ssam * case that needs to be honored (mode 11g filters out 1089184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1090184302Ssam * in scanning to be demoted. 1091184302Ssam * 1092184302Ssam * NB: we cheat a bit here by looking at the max rate; 1093184302Ssam * we could/should check the rates. 1094184302Ssam */ 1095184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1096184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1097184302Ssam fail |= MATCH_RATE; 1098184302Ssam else 1099184302Ssam se0->se_flags |= STA_DEMOTE11B; 1100184302Ssam } 1101170530Ssam if (ss->ss_nssid != 0 && 1102171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1103171409Ssam fail |= MATCH_SSID; 1104178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1105178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1106178354Ssam fail |= MATCH_BSSID; 1107170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1108171409Ssam fail |= MATCH_FAILS; 1109170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1110171409Ssam fail |= MATCH_NOTSEEN; 1111170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1112171409Ssam fail |= MATCH_RSSI; 1113170530Ssam#ifdef IEEE80211_DEBUG 1114178354Ssam if (ieee80211_msg(vap, debug)) { 1115170530Ssam printf(" %c %s", 1116171409Ssam fail & MATCH_FAILS ? '=' : 1117171409Ssam fail & MATCH_NOTSEEN ? '^' : 1118178354Ssam fail & MATCH_CC ? '$' : 1119186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1120186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1121189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1122189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1123189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1124189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1125186904Ssam#endif 1126195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1127171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1128170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1129171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1130170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1131171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1132171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1133170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1134171409Ssam fail & MATCH_RATE ? '!' : ' '); 1135170530Ssam printf(" %4s%c", 1136170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1137189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1138171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1139170530Ssam printf(" %3s%c ", 1140170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1141170530Ssam "wep" : "no", 1142171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1143170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1144195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1145170530Ssam } 1146170530Ssam#endif 1147170530Ssam return fail; 1148170530Ssam} 1149170530Ssam 1150170530Ssamstatic void 1151170530Ssamsta_update_notseen(struct sta_table *st) 1152170530Ssam{ 1153170530Ssam struct sta_entry *se; 1154170530Ssam 1155206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1156170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1157170530Ssam /* 1158170530Ssam * If seen the reset and don't bump the count; 1159170530Ssam * otherwise bump the ``not seen'' count. Note 1160170530Ssam * that this insures that stations for which we 1161170530Ssam * see frames while not scanning but not during 1162170530Ssam * this scan will not be penalized. 1163170530Ssam */ 1164170530Ssam if (se->se_seen) 1165170530Ssam se->se_seen = 0; 1166170530Ssam else 1167170530Ssam se->se_notseen++; 1168170530Ssam } 1169206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1170170530Ssam} 1171170530Ssam 1172170530Ssamstatic void 1173170530Ssamsta_dec_fails(struct sta_table *st) 1174170530Ssam{ 1175170530Ssam struct sta_entry *se; 1176170530Ssam 1177206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1178170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1179170530Ssam if (se->se_fails) 1180170530Ssam se->se_fails--; 1181206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1182170530Ssam} 1183170530Ssam 1184170530Ssamstatic struct sta_entry * 1185178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1186170530Ssam{ 1187170530Ssam struct sta_table *st = ss->ss_priv; 1188170530Ssam struct sta_entry *se, *selbs = NULL; 1189170530Ssam 1190178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1191170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1192206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1193170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1194184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1195178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1196170530Ssam if (selbs == NULL) 1197170530Ssam selbs = se; 1198170530Ssam else if (sta_compare(se, selbs) > 0) 1199170530Ssam selbs = se; 1200170530Ssam } 1201170530Ssam } 1202206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1203170530Ssam 1204170530Ssam return selbs; 1205170530Ssam} 1206170530Ssam 1207170530Ssam/* 1208170530Ssam * Pick an ap or ibss network to join or find a channel 1209170530Ssam * to use to start an ibss network. 1210170530Ssam */ 1211170530Ssamstatic int 1212178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1213170530Ssam{ 1214170530Ssam struct sta_table *st = ss->ss_priv; 1215170530Ssam struct sta_entry *selbs; 1216184274Ssam struct ieee80211_channel *chan; 1217170530Ssam 1218178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1219178354Ssam ("wrong mode %u", vap->iv_opmode)); 1220170530Ssam 1221170530Ssam if (st->st_newscan) { 1222170530Ssam sta_update_notseen(st); 1223170530Ssam st->st_newscan = 0; 1224170530Ssam } 1225170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1226170530Ssam /* 1227170530Ssam * Manual/background scan, don't select+join the 1228170530Ssam * bss, just return. The scanning framework will 1229170530Ssam * handle notification that this has completed. 1230170530Ssam */ 1231170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1232170530Ssam return 1; 1233170530Ssam } 1234170530Ssam /* 1235170530Ssam * Automatic sequencing; look for a candidate and 1236170530Ssam * if found join the network. 1237170530Ssam */ 1238170530Ssam /* NB: unlocked read should be ok */ 1239170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1240178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1241170530Ssam "%s: no scan candidate\n", __func__); 1242178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1243178354Ssam return 0; 1244170530Ssamnotfound: 1245170530Ssam /* 1246170530Ssam * If nothing suitable was found decrement 1247170530Ssam * the failure counts so entries will be 1248170530Ssam * reconsidered the next time around. We 1249170530Ssam * really want to do this only for sta's 1250170530Ssam * where we've previously had some success. 1251170530Ssam */ 1252170530Ssam sta_dec_fails(st); 1253170530Ssam st->st_newscan = 1; 1254170530Ssam return 0; /* restart scan */ 1255170530Ssam } 1256178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1257178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1258178354Ssam return (selbs != NULL); 1259184274Ssam if (selbs == NULL) 1260170530Ssam goto notfound; 1261184274Ssam chan = selbs->base.se_chan; 1262184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1263184302Ssam chan = demote11b(vap, chan); 1264184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1265184274Ssam goto notfound; 1266170530Ssam return 1; /* terminate scan */ 1267170530Ssam} 1268170530Ssam 1269170530Ssam/* 1270170530Ssam * Lookup an entry in the scan cache. We assume we're 1271170530Ssam * called from the bottom half or such that we don't need 1272170530Ssam * to block the bottom half so that it's safe to return 1273170530Ssam * a reference to an entry w/o holding the lock on the table. 1274170530Ssam */ 1275170530Ssamstatic struct sta_entry * 1276170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1277170530Ssam{ 1278170530Ssam struct sta_entry *se; 1279170530Ssam int hash = STA_HASH(macaddr); 1280170530Ssam 1281206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1282170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1283170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1284170530Ssam break; 1285206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1286170530Ssam 1287170530Ssam return se; /* NB: unlocked */ 1288170530Ssam} 1289170530Ssam 1290170530Ssamstatic void 1291178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1292170530Ssam{ 1293178354Ssam struct ieee80211com *ic = vap->iv_ic; 1294178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1295170530Ssam struct sta_table *st = ss->ss_priv; 1296178354Ssam enum ieee80211_phymode mode; 1297170530Ssam struct sta_entry *se, *selbs; 1298178354Ssam uint8_t roamRate, curRate, ucastRate; 1299170530Ssam int8_t roamRssi, curRssi; 1300170530Ssam 1301170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1302170530Ssam if (se == NULL) { 1303170530Ssam /* XXX something is wrong */ 1304170530Ssam return; 1305170530Ssam } 1306170530Ssam 1307178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1308178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1309178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1310178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1311170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1312170530Ssam curRssi = ic->ic_node_getrssi(ni); 1313178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1314178354Ssam curRate = ni->ni_txrate; 1315178354Ssam roamRate &= IEEE80211_RATE_VAL; 1316178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1317170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1318170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1319170530Ssam } else { 1320170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1321178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1322170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1323170530Ssam } 1324170530Ssam /* 1325170530Ssam * Check if a new ap should be used and switch. 1326170530Ssam * XXX deauth current ap 1327170530Ssam */ 1328170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1329297405Sadrian if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1330170530Ssam /* 1331170530Ssam * Scan cache contents are too old; force a scan now 1332170530Ssam * if possible so we have current state to make a 1333170530Ssam * decision with. We don't kick off a bg scan if 1334170530Ssam * we're using dynamic turbo and boosted or if the 1335170530Ssam * channel is busy. 1336170530Ssam * XXX force immediate switch on scan complete 1337170530Ssam */ 1338170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1339297405Sadrian ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1340178354Ssam ieee80211_bg_scan(vap, 0); 1341170530Ssam return; 1342170530Ssam } 1343170530Ssam se->base.se_rssi = curRssi; 1344178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1345170530Ssam if (selbs != NULL && selbs != se) { 1346184274Ssam struct ieee80211_channel *chan; 1347184274Ssam 1348178354Ssam IEEE80211_DPRINTF(vap, 1349170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1350170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1351170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1352170530Ssam curRate, roamRate, curRssi, roamRssi); 1353184274Ssam 1354184274Ssam chan = selbs->base.se_chan; 1355184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1356184302Ssam chan = demote11b(vap, chan); 1357184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1358170530Ssam } 1359170530Ssam } 1360170530Ssam} 1361170530Ssam 1362170530Ssam/* 1363170530Ssam * Age entries in the scan cache. 1364170530Ssam * XXX also do roaming since it's convenient 1365170530Ssam */ 1366170530Ssamstatic void 1367170530Ssamsta_age(struct ieee80211_scan_state *ss) 1368170530Ssam{ 1369178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1370170530Ssam 1371178354Ssam adhoc_age(ss); 1372170530Ssam /* 1373170530Ssam * If rate control is enabled check periodically to see if 1374170530Ssam * we should roam from our current connection to one that 1375170530Ssam * might be better. This only applies when we're operating 1376170530Ssam * in sta mode and automatic roaming is set. 1377170530Ssam * XXX defer if busy 1378170530Ssam * XXX repeater station 1379170530Ssam * XXX do when !bgscan? 1380170530Ssam */ 1381178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1382178354Ssam ("wrong mode %u", vap->iv_opmode)); 1383178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1384213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1385178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1386170530Ssam /* XXX vap is implicit */ 1387178354Ssam sta_roam_check(ss, vap); 1388170530Ssam} 1389170530Ssam 1390170530Ssam/* 1391170530Ssam * Iterate over the entries in the scan cache, invoking 1392170530Ssam * the callback function on each one. 1393170530Ssam */ 1394170530Ssamstatic void 1395170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1396170530Ssam ieee80211_scan_iter_func *f, void *arg) 1397170530Ssam{ 1398170530Ssam struct sta_table *st = ss->ss_priv; 1399170530Ssam struct sta_entry *se; 1400170530Ssam u_int gen; 1401170530Ssam 1402283556Sadrian IEEE80211_SCAN_ITER_LOCK(st); 1403178354Ssam gen = st->st_scaniter++; 1404170530Ssamrestart: 1405206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1406170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1407170530Ssam if (se->se_scangen != gen) { 1408170530Ssam se->se_scangen = gen; 1409170530Ssam /* update public state */ 1410170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1411206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1412170530Ssam (*f)(arg, &se->base); 1413170530Ssam goto restart; 1414170530Ssam } 1415170530Ssam } 1416206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1417170530Ssam 1418283556Sadrian IEEE80211_SCAN_ITER_UNLOCK(st); 1419170530Ssam} 1420170530Ssam 1421170530Ssamstatic void 1422170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1423170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1424170530Ssam{ 1425170530Ssam struct sta_table *st = ss->ss_priv; 1426170530Ssam struct sta_entry *se; 1427170530Ssam 1428170530Ssam se = sta_lookup(st, macaddr); 1429170530Ssam if (se != NULL) { 1430170530Ssam se->se_fails++; 1431170530Ssam se->se_lastfail = ticks; 1432178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1433170530Ssam macaddr, "%s: reason %u fails %u", 1434170530Ssam __func__, reason, se->se_fails); 1435170530Ssam } 1436170530Ssam} 1437170530Ssam 1438170530Ssamstatic void 1439170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1440170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1441170530Ssam{ 1442170530Ssam struct sta_table *st = ss->ss_priv; 1443170530Ssam struct sta_entry *se; 1444170530Ssam 1445170530Ssam se = sta_lookup(st, macaddr); 1446170530Ssam if (se != NULL) { 1447170530Ssam#if 0 1448170530Ssam se->se_fails = 0; 1449178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1450170530Ssam macaddr, "%s: fails %u", 1451170530Ssam __func__, se->se_fails); 1452170530Ssam#endif 1453170530Ssam se->se_lastassoc = ticks; 1454170530Ssam } 1455170530Ssam} 1456170530Ssam 1457170530Ssamstatic const struct ieee80211_scanner sta_default = { 1458170530Ssam .scan_name = "default", 1459170530Ssam .scan_attach = sta_attach, 1460170530Ssam .scan_detach = sta_detach, 1461170530Ssam .scan_start = sta_start, 1462170530Ssam .scan_restart = sta_restart, 1463170530Ssam .scan_cancel = sta_cancel, 1464170530Ssam .scan_end = sta_pick_bss, 1465170530Ssam .scan_flush = sta_flush, 1466170530Ssam .scan_add = sta_add, 1467170530Ssam .scan_age = sta_age, 1468170530Ssam .scan_iterate = sta_iterate, 1469170530Ssam .scan_assoc_fail = sta_assoc_fail, 1470170530Ssam .scan_assoc_success = sta_assoc_success, 1471170530Ssam}; 1472195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1473170530Ssam 1474170530Ssam/* 1475170530Ssam * Adhoc mode-specific support. 1476170530Ssam */ 1477170530Ssam 1478170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1479170530Ssam{ 5180, 5200, 5220, 5240 }; 1480170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1481170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1482170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1483170530Ssam{ 5170, 5190, 5210, 5230 }; 1484170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1485170530Ssam{ 2457, 2462 }; 1486170530Ssam 1487170530Ssamstatic const struct scanlist adhocScanTable[] = { 1488170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1489170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1490170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1491170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1492170530Ssam { .list = NULL } 1493170530Ssam}; 1494170530Ssam#undef X 1495170530Ssam 1496170530Ssam/* 1497170530Ssam * Start an adhoc-mode scan by populating the channel list. 1498170530Ssam */ 1499170530Ssamstatic int 1500178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1501170530Ssam{ 1502170530Ssam struct sta_table *st = ss->ss_priv; 1503170530Ssam 1504178354Ssam makescanlist(ss, vap, adhocScanTable); 1505176653Ssam 1506178354Ssam if (ss->ss_mindwell == 0) 1507178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1508178354Ssam if (ss->ss_maxdwell == 0) 1509178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1510176653Ssam 1511178354Ssam st->st_scangen++; 1512170530Ssam st->st_newscan = 1; 1513170530Ssam 1514170530Ssam return 0; 1515170530Ssam} 1516170530Ssam 1517170530Ssam/* 1518170530Ssam * Select a channel to start an adhoc network on. 1519170530Ssam * The channel list was populated with appropriate 1520170530Ssam * channels so select one that looks least occupied. 1521170530Ssam */ 1522170530Ssamstatic struct ieee80211_channel * 1523178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1524170530Ssam{ 1525170530Ssam struct sta_table *st = ss->ss_priv; 1526170530Ssam struct sta_entry *se; 1527170530Ssam struct ieee80211_channel *c, *bestchan; 1528170530Ssam int i, bestrssi, maxrssi; 1529170530Ssam 1530170530Ssam bestchan = NULL; 1531170530Ssam bestrssi = -1; 1532170530Ssam 1533206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1534170530Ssam for (i = 0; i < ss->ss_last; i++) { 1535170530Ssam c = ss->ss_chans[i]; 1536178354Ssam /* never consider a channel with radar */ 1537178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1538176653Ssam continue; 1539178354Ssam /* skip channels disallowed by regulatory settings */ 1540178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1541178354Ssam continue; 1542178354Ssam /* check channel attributes for band compatibility */ 1543178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1544178354Ssam continue; 1545170530Ssam maxrssi = 0; 1546170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1547170530Ssam if (se->base.se_chan != c) 1548170530Ssam continue; 1549170530Ssam if (se->base.se_rssi > maxrssi) 1550170530Ssam maxrssi = se->base.se_rssi; 1551170530Ssam } 1552170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1553170530Ssam bestchan = c; 1554170530Ssam } 1555206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1556170530Ssam 1557170530Ssam return bestchan; 1558170530Ssam} 1559170530Ssam 1560170530Ssam/* 1561170530Ssam * Pick an ibss network to join or find a channel 1562170530Ssam * to use to start an ibss network. 1563170530Ssam */ 1564170530Ssamstatic int 1565178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1566170530Ssam{ 1567170530Ssam struct sta_table *st = ss->ss_priv; 1568170530Ssam struct sta_entry *selbs; 1569170530Ssam struct ieee80211_channel *chan; 1570245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1571170530Ssam 1572178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1573195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1574195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1575178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1576170530Ssam 1577170530Ssam if (st->st_newscan) { 1578170530Ssam sta_update_notseen(st); 1579170530Ssam st->st_newscan = 0; 1580170530Ssam } 1581170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1582170530Ssam /* 1583170530Ssam * Manual/background scan, don't select+join the 1584170530Ssam * bss, just return. The scanning framework will 1585170530Ssam * handle notification that this has completed. 1586170530Ssam */ 1587170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1588170530Ssam return 1; 1589170530Ssam } 1590170530Ssam /* 1591170530Ssam * Automatic sequencing; look for a candidate and 1592170530Ssam * if found join the network. 1593170530Ssam */ 1594170530Ssam /* NB: unlocked read should be ok */ 1595170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1596178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1597170530Ssam "%s: no scan candidate\n", __func__); 1598178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1599178354Ssam return 0; 1600170530Ssamnotfound: 1601186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1602186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1603186904Ssam if (vap->iv_des_nssid && 1604186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1605186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1606186904Ssam#else 1607178354Ssam if (vap->iv_des_nssid) { 1608186904Ssam#endif 1609170530Ssam /* 1610170530Ssam * No existing adhoc network to join and we have 1611170530Ssam * an ssid; start one up. If no channel was 1612170530Ssam * specified, try to select a channel. 1613170530Ssam */ 1614178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1615178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1616183421Ssam chan = adhoc_pick_channel(ss, 0); 1617178354Ssam } else 1618178354Ssam chan = vap->iv_des_chan; 1619170530Ssam if (chan != NULL) { 1620245928Sadrian /* 1621245928Sadrian * Create a HT capable IBSS; the per-node 1622245928Sadrian * probe request/response will result in 1623245928Sadrian * "correct" rate control capabilities being 1624245928Sadrian * negotiated. 1625245928Sadrian */ 1626245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1627245928Sadrian chan, vap->iv_flags_ht); 1628178354Ssam ieee80211_create_ibss(vap, chan); 1629170530Ssam return 1; 1630170530Ssam } 1631170530Ssam } 1632170530Ssam /* 1633170530Ssam * If nothing suitable was found decrement 1634170530Ssam * the failure counts so entries will be 1635170530Ssam * reconsidered the next time around. We 1636170530Ssam * really want to do this only for sta's 1637170530Ssam * where we've previously had some success. 1638170530Ssam */ 1639170530Ssam sta_dec_fails(st); 1640170530Ssam st->st_newscan = 1; 1641170530Ssam return 0; /* restart scan */ 1642170530Ssam } 1643178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1644178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1645178354Ssam return (selbs != NULL); 1646184274Ssam if (selbs == NULL) 1647170530Ssam goto notfound; 1648184274Ssam chan = selbs->base.se_chan; 1649184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1650184302Ssam chan = demote11b(vap, chan); 1651245928Sadrian /* 1652245928Sadrian * If HT is available, make it a possibility here. 1653245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1654245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1655245928Sadrian * to any subsequent nodes that support it. 1656245928Sadrian */ 1657245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1658245928Sadrian chan, vap->iv_flags_ht); 1659184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1660184274Ssam goto notfound; 1661170530Ssam return 1; /* terminate scan */ 1662170530Ssam} 1663170530Ssam 1664170530Ssam/* 1665170530Ssam * Age entries in the scan cache. 1666170530Ssam */ 1667170530Ssamstatic void 1668170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1669170530Ssam{ 1670170530Ssam struct sta_table *st = ss->ss_priv; 1671170530Ssam struct sta_entry *se, *next; 1672170530Ssam 1673206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1674170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1675170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1676170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1677170530Ssam LIST_REMOVE(se, se_hash); 1678178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1679283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 1680170530Ssam } 1681170530Ssam } 1682206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1683170530Ssam} 1684170530Ssam 1685170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1686170530Ssam .scan_name = "default", 1687170530Ssam .scan_attach = sta_attach, 1688170530Ssam .scan_detach = sta_detach, 1689170530Ssam .scan_start = adhoc_start, 1690170530Ssam .scan_restart = sta_restart, 1691170530Ssam .scan_cancel = sta_cancel, 1692170530Ssam .scan_end = adhoc_pick_bss, 1693170530Ssam .scan_flush = sta_flush, 1694178354Ssam .scan_pickchan = adhoc_pick_channel, 1695170530Ssam .scan_add = sta_add, 1696170530Ssam .scan_age = adhoc_age, 1697170530Ssam .scan_iterate = sta_iterate, 1698170530Ssam .scan_assoc_fail = sta_assoc_fail, 1699170530Ssam .scan_assoc_success = sta_assoc_success, 1700170530Ssam}; 1701195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1702195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1703170530Ssam 1704178354Ssamstatic int 1705178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1706178354Ssam{ 1707178354Ssam struct sta_table *st = ss->ss_priv; 1708178354Ssam 1709178354Ssam makescanlist(ss, vap, staScanTable); 1710178354Ssam 1711178354Ssam if (ss->ss_mindwell == 0) 1712178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1713178354Ssam if (ss->ss_maxdwell == 0) 1714178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1715178354Ssam 1716178354Ssam st->st_scangen++; 1717178354Ssam st->st_newscan = 1; 1718178354Ssam 1719178354Ssam return 0; 1720178354Ssam} 1721178354Ssam 1722170530Ssam/* 1723178354Ssam * Cancel an ongoing scan. 1724170530Ssam */ 1725170530Ssamstatic int 1726178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1727170530Ssam{ 1728178354Ssam return 0; 1729178354Ssam} 1730178354Ssam 1731178354Ssam/* 1732178354Ssam * Pick a quiet channel to use for ap operation. 1733178354Ssam */ 1734178354Ssamstatic struct ieee80211_channel * 1735178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1736178354Ssam{ 1737178354Ssam struct sta_table *st = ss->ss_priv; 1738178354Ssam struct ieee80211_channel *bestchan = NULL; 1739178354Ssam int i; 1740178354Ssam 1741178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1742178354Ssam /* NB: use scan list order to preserve channel preference */ 1743178354Ssam for (i = 0; i < ss->ss_last; i++) { 1744178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1745178354Ssam /* 1746178354Ssam * If the channel is unoccupied the max rssi 1747178354Ssam * should be zero; just take it. Otherwise 1748178354Ssam * track the channel with the lowest rssi and 1749178354Ssam * use that when all channels appear occupied. 1750178354Ssam */ 1751178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1752178354Ssam continue; 1753178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1754178354Ssam continue; 1755178354Ssam /* check channel attributes for band compatibility */ 1756178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1757178354Ssam continue; 1758186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1759178354Ssam /* XXX channel have interference */ 1760178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1761178354Ssam /* XXX use other considerations */ 1762178354Ssam return chan; 1763170530Ssam } 1764178354Ssam if (bestchan == NULL || 1765178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1766178354Ssam bestchan = chan; 1767178354Ssam } 1768178354Ssam return bestchan; 1769178354Ssam} 1770178354Ssam 1771178354Ssam/* 1772178354Ssam * Pick a quiet channel to use for ap operation. 1773178354Ssam */ 1774178354Ssamstatic int 1775178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1776178354Ssam{ 1777178354Ssam struct ieee80211com *ic = vap->iv_ic; 1778178354Ssam struct ieee80211_channel *bestchan; 1779178354Ssam 1780178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1781178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1782178354Ssam bestchan = ap_pick_channel(ss, 0); 1783178354Ssam if (bestchan == NULL) { 1784178354Ssam /* no suitable channel, should not happen */ 1785178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1786178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1787178354Ssam /* XXX print something? */ 1788178354Ssam return 0; /* restart scan */ 1789178354Ssam } 1790178354Ssam /* 1791178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1792178354Ssam */ 1793178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1794178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1795178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1796178354Ssam if (bestchan == NULL) { 1797178354Ssam /* should never happen ?? */ 1798178354Ssam return 0; 1799170530Ssam } 1800170530Ssam } 1801178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1802178354Ssam /* 1803178354Ssam * Manual/background scan, don't select+join the 1804178354Ssam * bss, just return. The scanning framework will 1805178354Ssam * handle notification that this has completed. 1806178354Ssam */ 1807178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1808178354Ssam return 1; 1809178354Ssam } 1810178354Ssam ieee80211_create_ibss(vap, 1811193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1812178354Ssam return 1; 1813170530Ssam} 1814170530Ssam 1815178354Ssamstatic const struct ieee80211_scanner ap_default = { 1816178354Ssam .scan_name = "default", 1817178354Ssam .scan_attach = sta_attach, 1818178354Ssam .scan_detach = sta_detach, 1819178354Ssam .scan_start = ap_start, 1820178354Ssam .scan_restart = sta_restart, 1821178354Ssam .scan_cancel = ap_cancel, 1822178354Ssam .scan_end = ap_end, 1823178354Ssam .scan_flush = sta_flush, 1824178354Ssam .scan_pickchan = ap_pick_channel, 1825178354Ssam .scan_add = sta_add, 1826178354Ssam .scan_age = adhoc_age, 1827178354Ssam .scan_iterate = sta_iterate, 1828178354Ssam .scan_assoc_success = sta_assoc_success, 1829178354Ssam .scan_assoc_fail = sta_assoc_fail, 1830170530Ssam}; 1831195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1832178354Ssam 1833195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1834178354Ssam/* 1835195618Srpaulo * Pick an mbss network to join or find a channel 1836195618Srpaulo * to use to start an mbss network. 1837178354Ssam */ 1838195618Srpaulostatic int 1839195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1840195618Srpaulo{ 1841195618Srpaulo struct sta_table *st = ss->ss_priv; 1842195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1843195618Srpaulo struct sta_entry *selbs; 1844195618Srpaulo struct ieee80211_channel *chan; 1845195618Srpaulo 1846195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1847195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1848195618Srpaulo 1849195618Srpaulo if (st->st_newscan) { 1850195618Srpaulo sta_update_notseen(st); 1851195618Srpaulo st->st_newscan = 0; 1852195618Srpaulo } 1853195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1854195618Srpaulo /* 1855195618Srpaulo * Manual/background scan, don't select+join the 1856195618Srpaulo * bss, just return. The scanning framework will 1857195618Srpaulo * handle notification that this has completed. 1858195618Srpaulo */ 1859195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1860195618Srpaulo return 1; 1861195618Srpaulo } 1862195618Srpaulo /* 1863195618Srpaulo * Automatic sequencing; look for a candidate and 1864195618Srpaulo * if found join the network. 1865195618Srpaulo */ 1866195618Srpaulo /* NB: unlocked read should be ok */ 1867195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1868195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1869195618Srpaulo "%s: no scan candidate\n", __func__); 1870195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1871195618Srpaulo return 0; 1872195618Srpaulonotfound: 1873195618Srpaulo if (ms->ms_idlen != 0) { 1874195618Srpaulo /* 1875195618Srpaulo * No existing mbss network to join and we have 1876195618Srpaulo * a meshid; start one up. If no channel was 1877195618Srpaulo * specified, try to select a channel. 1878195618Srpaulo */ 1879195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1880195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1881195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1882195618Srpaulo 1883195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1884195618Srpaulo if (chan != NULL) 1885195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1886195618Srpaulo chan, vap->iv_flags_ht); 1887195618Srpaulo } else 1888195618Srpaulo chan = vap->iv_des_chan; 1889195618Srpaulo if (chan != NULL) { 1890195618Srpaulo ieee80211_create_ibss(vap, chan); 1891195618Srpaulo return 1; 1892195618Srpaulo } 1893195618Srpaulo } 1894195618Srpaulo /* 1895195618Srpaulo * If nothing suitable was found decrement 1896195618Srpaulo * the failure counts so entries will be 1897195618Srpaulo * reconsidered the next time around. We 1898195618Srpaulo * really want to do this only for sta's 1899195618Srpaulo * where we've previously had some success. 1900195618Srpaulo */ 1901195618Srpaulo sta_dec_fails(st); 1902195618Srpaulo st->st_newscan = 1; 1903195618Srpaulo return 0; /* restart scan */ 1904195618Srpaulo } 1905195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1906195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1907195618Srpaulo return (selbs != NULL); 1908195618Srpaulo if (selbs == NULL) 1909195618Srpaulo goto notfound; 1910195618Srpaulo chan = selbs->base.se_chan; 1911195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1912195618Srpaulo chan = demote11b(vap, chan); 1913195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1914195618Srpaulo goto notfound; 1915195618Srpaulo return 1; /* terminate scan */ 1916195618Srpaulo} 1917195618Srpaulo 1918195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1919195618Srpaulo .scan_name = "default", 1920195618Srpaulo .scan_attach = sta_attach, 1921195618Srpaulo .scan_detach = sta_detach, 1922195618Srpaulo .scan_start = adhoc_start, 1923195618Srpaulo .scan_restart = sta_restart, 1924195618Srpaulo .scan_cancel = sta_cancel, 1925195618Srpaulo .scan_end = mesh_pick_bss, 1926195618Srpaulo .scan_flush = sta_flush, 1927195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1928195618Srpaulo .scan_add = sta_add, 1929195618Srpaulo .scan_age = adhoc_age, 1930195618Srpaulo .scan_iterate = sta_iterate, 1931195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1932195618Srpaulo .scan_assoc_success = sta_assoc_success, 1933195618Srpaulo}; 1934195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1935195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1936