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 344223 2019-02-17 03:12:27Z avos $"); 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) { 475343510Savos KASSERT(IEEE80211_IS_CHAN_B(c), 476343510Savos ("%s: wrong channel for 'auto' mode %u / %u\n", 477343510Savos __func__, c->ic_freq, c->ic_flags)); 478343510Savos 479170530Ssam /* 480170530Ssam * XXX special-case 11b/g channels so we select 481178354Ssam * the g channel if both are present. 482170530Ssam */ 483343510Savos if ((cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 484178354Ssam c = cg; 485170530Ssam } 486170530Ssam ss->ss_chans[ss->ss_last++] = c; 487170530Ssam } 488170530Ssam} 489170530Ssam 490170530Ssamstruct scanlist { 491170530Ssam uint16_t mode; 492170530Ssam uint16_t count; 493170530Ssam const uint16_t *list; 494170530Ssam}; 495170530Ssam 496170530Ssamstatic int 497170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 498170530Ssam{ 499170530Ssam int i; 500170530Ssam 501170530Ssam for (; scan->list != NULL; scan++) { 502170530Ssam for (i = 0; i < scan->count; i++) 503170530Ssam if (scan->list[i] == c->ic_freq) 504170530Ssam return 1; 505170530Ssam } 506170530Ssam return 0; 507170530Ssam} 508170530Ssam 509189377Ssamstatic int 510189377Ssamonscanlist(const struct ieee80211_scan_state *ss, 511189377Ssam const struct ieee80211_channel *c) 512189377Ssam{ 513189377Ssam int i; 514189377Ssam 515189377Ssam for (i = 0; i < ss->ss_last; i++) 516189377Ssam if (ss->ss_chans[i] == c) 517189377Ssam return 1; 518189377Ssam return 0; 519189377Ssam} 520189377Ssam 521176653Ssamstatic void 522178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 523176653Ssam const struct scanlist table[]) 524176653Ssam{ 525178354Ssam struct ieee80211com *ic = vap->iv_ic; 526176653Ssam struct ieee80211_channel *c; 527176653Ssam int i; 528176653Ssam 529176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 530176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 531176653Ssam break; 532176653Ssam 533176653Ssam c = &ic->ic_channels[i]; 534176653Ssam /* 535176653Ssam * Ignore dynamic turbo channels; we scan them 536176653Ssam * in normal mode (i.e. not boosted). Likewise 537176653Ssam * for HT channels, they get scanned using 538176653Ssam * legacy rates. 539176653Ssam */ 540176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 541176653Ssam continue; 542176653Ssam 543176653Ssam /* 544176653Ssam * If a desired mode was specified, scan only 545176653Ssam * channels that satisfy that constraint. 546176653Ssam */ 547178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 548178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 549176653Ssam continue; 550176653Ssam 551176653Ssam /* 552176653Ssam * Skip channels excluded by user request. 553176653Ssam */ 554178354Ssam if (isexcluded(vap, c)) 555176653Ssam continue; 556176653Ssam 557176653Ssam /* 558176653Ssam * Add the channel unless it is listed in the 559176653Ssam * fixed scan order tables. This insures we 560176653Ssam * don't sweep back in channels we filtered out 561176653Ssam * above. 562176653Ssam */ 563176653Ssam if (checktable(table, c)) 564176653Ssam continue; 565176653Ssam 566176653Ssam /* Add channel to scanning list. */ 567176653Ssam ss->ss_chans[ss->ss_last++] = c; 568176653Ssam } 569189377Ssam /* 570189377Ssam * Explicitly add any desired channel if: 571189377Ssam * - not already on the scan list 572189377Ssam * - allowed by any desired mode constraint 573189377Ssam * - there is space in the scan list 574189377Ssam * This allows the channel to be used when the filtering 575189377Ssam * mechanisms would otherwise elide it (e.g HT, turbo). 576189377Ssam */ 577189377Ssam c = vap->iv_des_chan; 578189377Ssam if (c != IEEE80211_CHAN_ANYC && 579189377Ssam !onscanlist(ss, c) && 580189377Ssam (vap->iv_des_mode == IEEE80211_MODE_AUTO || 581189377Ssam vap->iv_des_mode == ieee80211_chan2mode(c)) && 582189377Ssam ss->ss_last < IEEE80211_SCAN_MAX) 583189377Ssam ss->ss_chans[ss->ss_last++] = c; 584176653Ssam} 585176653Ssam 586178354Ssamstatic void 587178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 588178354Ssam const struct scanlist table[]) 589170530Ssam{ 590170530Ssam const struct scanlist *scan; 591170530Ssam enum ieee80211_phymode mode; 592170530Ssam 593170530Ssam ss->ss_last = 0; 594170530Ssam /* 595170530Ssam * Use the table of ordered channels to construct the list 596170530Ssam * of channels for scanning. Any channels in the ordered 597170530Ssam * list not in the master list will be discarded. 598170530Ssam */ 599178354Ssam for (scan = table; scan->list != NULL; scan++) { 600170530Ssam mode = scan->mode; 601343509Savos 602343509Savos switch (mode) { 603343509Savos case IEEE80211_MODE_11B: 604343509Savos if (vap->iv_des_mode == IEEE80211_MODE_11B) 605343509Savos break; 606343509Savos 607170530Ssam /* 608343509Savos * The scan table marks 2.4Ghz channels as b 609343509Savos * so if the desired mode is 11g / 11ng, 610343509Savos * then use the 11b channel list but upgrade the mode. 611343509Savos * 612343509Savos * NB: 11b -> AUTO lets add_channels upgrade an 613343509Savos * 11b channel to 11g if available. 614170530Ssam */ 615343509Savos if (vap->iv_des_mode == IEEE80211_MODE_AUTO || 616343509Savos vap->iv_des_mode == IEEE80211_MODE_11G || 617343509Savos vap->iv_des_mode == IEEE80211_MODE_11NG) { 618343509Savos mode = vap->iv_des_mode; 619343509Savos break; 620170530Ssam } 621343509Savos 622343509Savos continue; 623343509Savos case IEEE80211_MODE_11A: 624343509Savos /* Use 11a channel list for 11na mode */ 625343509Savos if (vap->iv_des_mode == IEEE80211_MODE_11NA) { 626343509Savos mode = vap->iv_des_mode; 627343509Savos break; 628343509Savos } 629343509Savos 630343509Savos /* FALLTHROUGH */ 631343509Savos default: 632170530Ssam /* 633343509Savos * If a desired mode was specified, scan only 634343509Savos * channels that satisfy that constraint. 635170530Ssam */ 636343509Savos if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 637343509Savos vap->iv_des_mode != mode) 638343509Savos continue; 639170530Ssam } 640343509Savos 641170530Ssam#ifdef IEEE80211_F_XR 642170530Ssam /* XR does not operate on turbo channels */ 643178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 644170530Ssam (mode == IEEE80211_MODE_TURBO_A || 645170530Ssam mode == IEEE80211_MODE_TURBO_G || 646170530Ssam mode == IEEE80211_MODE_STURBO_A)) 647170530Ssam continue; 648170530Ssam#endif 649170530Ssam /* 650170530Ssam * Add the list of the channels; any that are not 651170530Ssam * in the master channel list will be discarded. 652170530Ssam */ 653178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 654170530Ssam } 655170530Ssam 656170530Ssam /* 657178354Ssam * Add the channels from the ic that are not present 658178354Ssam * in the table. 659170530Ssam */ 660178354Ssam sweepchannels(ss, vap, table); 661178354Ssam} 662170530Ssam 663178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 664178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 665178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 666178354Ssam{ 5170, 5190, 5210, 5230 }; 667178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 668178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 669178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 670178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 671178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 672178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 673178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 674178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 675178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 676178354Ssam{ 2484 }; 677178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 678178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 679178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 680178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 681178354Ssam#ifdef ATH_TURBO_SCAN 682178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 683178354Ssam{ 5210, 5250, 5290 }; 684178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 685178354Ssam{ 5760, 5800 }; 686178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 687178354Ssam{ 5540, 5580, 5620, 5660 }; 688178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 689178354Ssam{ 2437 }; 690178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 691178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 692178354Ssam#endif /* ATH_TURBO_SCAN */ 693170530Ssam 694178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 695170530Ssam 696178354Ssamstatic const struct scanlist staScanTable[] = { 697178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 698178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 699178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 700178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 701178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 702178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 703178354Ssam#ifdef ATH_TURBO_SCAN 704178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 705178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 706178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 707178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 708178354Ssam#endif /* ATH_TURBO_SCAN */ 709178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 710178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 711178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 712178354Ssam#ifdef ATH_TURBO_SCAN 713178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 714178354Ssam#endif /* ATH_TURBO_SCAN */ 715178354Ssam { .list = NULL } 716178354Ssam}; 717178354Ssam 718178354Ssam/* 719178354Ssam * Start a station-mode scan by populating the channel list. 720178354Ssam */ 721178354Ssamstatic int 722178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 723178354Ssam{ 724178354Ssam struct sta_table *st = ss->ss_priv; 725178354Ssam 726178354Ssam makescanlist(ss, vap, staScanTable); 727178354Ssam 728178354Ssam if (ss->ss_mindwell == 0) 729178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 730178354Ssam if (ss->ss_maxdwell == 0) 731178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 732178354Ssam 733178354Ssam st->st_scangen++; 734170530Ssam st->st_newscan = 1; 735170530Ssam 736170530Ssam return 0; 737170530Ssam} 738170530Ssam 739170530Ssam/* 740178354Ssam * Restart a scan, typically a bg scan but can 741178354Ssam * also be a fg scan that came up empty. 742170530Ssam */ 743170530Ssamstatic int 744178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 745170530Ssam{ 746170530Ssam struct sta_table *st = ss->ss_priv; 747170530Ssam 748170530Ssam st->st_newscan = 1; 749170530Ssam return 0; 750170530Ssam} 751170530Ssam 752170530Ssam/* 753170530Ssam * Cancel an ongoing scan. 754170530Ssam */ 755170530Ssamstatic int 756178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 757170530Ssam{ 758170530Ssam return 0; 759170530Ssam} 760170530Ssam 761184302Ssam/* 762184302Ssam * Demote any supplied 11g channel to 11b. There should 763184302Ssam * always be an 11b channel but we check anyway... 764184302Ssam */ 765184302Ssamstatic struct ieee80211_channel * 766184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 767184302Ssam{ 768184302Ssam struct ieee80211_channel *c; 769178354Ssam 770184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 771184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 772184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 773184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 774184302Ssam IEEE80211_CHAN_B); 775184302Ssam if (c != NULL) 776184302Ssam chan = c; 777184302Ssam } 778184302Ssam return chan; 779184302Ssam} 780184302Ssam 781178354Ssamstatic int 782170530Ssammaxrate(const struct ieee80211_scan_entry *se) 783170530Ssam{ 784178354Ssam const struct ieee80211_ie_htcap *htcap = 785178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 786219601Sbschmidt int rmax, r, i, txstream; 787178354Ssam uint16_t caps; 788219601Sbschmidt uint8_t txparams; 789170530Ssam 790170530Ssam rmax = 0; 791178354Ssam if (htcap != NULL) { 792178354Ssam /* 793178354Ssam * HT station; inspect supported MCS and then adjust 794219601Sbschmidt * rate by channel width. 795178354Ssam */ 796219601Sbschmidt txparams = htcap->hc_mcsset[12]; 797219601Sbschmidt if (txparams & 0x3) { 798219601Sbschmidt /* 799219601Sbschmidt * TX MCS parameters defined and not equal to RX, 800219601Sbschmidt * extract the number of spartial streams and 801219601Sbschmidt * map it to the highest MCS rate. 802219601Sbschmidt */ 803219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 804219601Sbschmidt i = txstream * 8 - 1; 805219601Sbschmidt } else 806219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 807178354Ssam if (i >= 0) { 808298359Savos caps = le16dec(&htcap->hc_cap); 809219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 810219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 811178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 812219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 813219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 814219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 815219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 816178354Ssam else 817219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 818178354Ssam } 819178354Ssam } 820170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 821170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 822170530Ssam if (r > rmax) 823170530Ssam rmax = r; 824170530Ssam } 825170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 826170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 827170530Ssam if (r > rmax) 828170530Ssam rmax = r; 829170530Ssam } 830170530Ssam return rmax; 831170530Ssam} 832170530Ssam 833170530Ssam/* 834170530Ssam * Compare the capabilities of two entries and decide which is 835170530Ssam * more desirable (return >0 if a is considered better). Note 836170530Ssam * that we assume compatibility/usability has already been checked 837170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 838170530Ssam * Used to select the best scan candidate for association in a BSS. 839170530Ssam */ 840170530Ssamstatic int 841170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 842170530Ssam{ 843170530Ssam#define PREFER(_a,_b,_what) do { \ 844170530Ssam if (((_a) ^ (_b)) & (_what)) \ 845170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 846170530Ssam} while (0) 847178354Ssam int maxa, maxb; 848170530Ssam int8_t rssia, rssib; 849170530Ssam int weight; 850170530Ssam 851170530Ssam /* privacy support */ 852170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 853170530Ssam IEEE80211_CAPINFO_PRIVACY); 854170530Ssam 855170530Ssam /* compare count of previous failures */ 856170530Ssam weight = b->se_fails - a->se_fails; 857170530Ssam if (abs(weight) > 1) 858170530Ssam return weight; 859170530Ssam 860170530Ssam /* 861170530Ssam * Compare rssi. If the two are considered equivalent 862170530Ssam * then fallback to other criteria. We threshold the 863170530Ssam * comparisons to avoid selecting an ap purely by rssi 864170530Ssam * when both values may be good but one ap is otherwise 865170530Ssam * more desirable (e.g. an 11b-only ap with stronger 866170530Ssam * signal than an 11g ap). 867170530Ssam */ 868170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 869170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 870170530Ssam if (abs(rssib - rssia) < 5) { 871170530Ssam /* best/max rate preferred if signal level close enough XXX */ 872170530Ssam maxa = maxrate(&a->base); 873170530Ssam maxb = maxrate(&b->base); 874170530Ssam if (maxa != maxb) 875170530Ssam return maxa - maxb; 876170530Ssam /* XXX use freq for channel preference */ 877170530Ssam /* for now just prefer 5Ghz band to all other bands */ 878178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 879178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 880170530Ssam } 881170530Ssam /* all things being equal, use signal level */ 882170530Ssam return a->base.se_rssi - b->base.se_rssi; 883170530Ssam#undef PREFER 884170530Ssam} 885170530Ssam 886170530Ssam/* 887170530Ssam * Check rate set suitability and return the best supported rate. 888178354Ssam * XXX inspect MCS for HT 889170530Ssam */ 890170530Ssamstatic int 891184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 892184302Ssam const struct ieee80211_scan_entry *se) 893170530Ssam{ 894170530Ssam const struct ieee80211_rateset *srs; 895178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 896170530Ssam const uint8_t *rs; 897170530Ssam 898178354Ssam okrate = badrate = 0; 899170530Ssam 900184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 901170530Ssam nrs = se->se_rates[1]; 902170530Ssam rs = se->se_rates+2; 903178354Ssam /* XXX MCS */ 904184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 905170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 906170530Ssamagain: 907170530Ssam for (i = 0; i < nrs; i++) { 908288086Sadrian r = IEEE80211_RV(rs[i]); 909170530Ssam badrate = r; 910170530Ssam /* 911170530Ssam * Check any fixed rate is included. 912170530Ssam */ 913178354Ssam if (r == ucastrate) 914170530Ssam fixedrate = r; 915170530Ssam /* 916170530Ssam * Check against our supported rates. 917170530Ssam */ 918170530Ssam for (j = 0; j < srs->rs_nrates; j++) 919288086Sadrian if (r == IEEE80211_RV(srs->rs_rates[j])) { 920170530Ssam if (r > okrate) /* NB: track max */ 921170530Ssam okrate = r; 922170530Ssam break; 923170530Ssam } 924170530Ssam 925170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 926170530Ssam /* 927170530Ssam * Don't try joining a BSS, if we don't support 928170530Ssam * one of its basic rates. 929170530Ssam */ 930170530Ssam okrate = 0; 931170530Ssam goto back; 932170530Ssam } 933170530Ssam } 934170530Ssam if (rs == se->se_rates+2) { 935170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 936170530Ssam nrs = se->se_xrates[1]; 937170530Ssam rs = se->se_xrates+2; 938170530Ssam goto again; 939170530Ssam } 940170530Ssam 941170530Ssamback: 942178354Ssam if (okrate == 0 || ucastrate != fixedrate) 943170530Ssam return badrate | IEEE80211_RATE_BASIC; 944170530Ssam else 945288086Sadrian return IEEE80211_RV(okrate); 946170530Ssam} 947170530Ssam 948195618Srpaulostatic __inline int 949195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 950195618Srpaulo{ 951195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 952195618Srpaulo} 953195618Srpaulo 954170530Ssamstatic int 955170530Ssammatch_ssid(const uint8_t *ie, 956170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 957170530Ssam{ 958170530Ssam int i; 959170530Ssam 960170530Ssam for (i = 0; i < nssid; i++) { 961195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 962170530Ssam return 1; 963170530Ssam } 964170530Ssam return 0; 965170530Ssam} 966170530Ssam 967186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 968186904Ssamstatic int 969186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 970186904Ssam{ 971186904Ssam int slot, slotcnt; 972186904Ssam 973186904Ssam slotcnt = tdma->tdma_slotcnt; 974186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 975186904Ssam if (isclr(tdma->tdma_inuse, slot)) 976186904Ssam return 0; 977186904Ssam return 1; 978186904Ssam} 979186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 980186904Ssam 981170530Ssam/* 982170530Ssam * Test a scan candidate for suitability/compatibility. 983170530Ssam */ 984170530Ssamstatic int 985178354Ssammatch_bss(struct ieee80211vap *vap, 986170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 987170530Ssam int debug) 988170530Ssam{ 989178354Ssam struct ieee80211com *ic = vap->iv_ic; 990170530Ssam struct ieee80211_scan_entry *se = &se0->base; 991178354Ssam uint8_t rate; 992178354Ssam int fail; 993170530Ssam 994170530Ssam fail = 0; 995170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 996171409Ssam fail |= MATCH_CHANNEL; 997170530Ssam /* 998170530Ssam * NB: normally the desired mode is used to construct 999170530Ssam * the channel list, but it's possible for the scan 1000170530Ssam * cache to include entries for stations outside this 1001170530Ssam * list so we check the desired mode here to weed them 1002170530Ssam * out. 1003170530Ssam */ 1004178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 1005170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 1006178354Ssam chanflags[vap->iv_des_mode]) 1007171409Ssam fail |= MATCH_CHANNEL; 1008178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 1009170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 1010171409Ssam fail |= MATCH_CAPINFO; 1011186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1012186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 1013186904Ssam /* 1014186904Ssam * Adhoc demo network setup shouldn't really be scanning 1015186904Ssam * but just in case skip stations operating in IBSS or 1016186904Ssam * BSS mode. 1017186904Ssam */ 1018186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1019186904Ssam fail |= MATCH_CAPINFO; 1020186904Ssam /* 1021186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1022186904Ssam * skip if IBSS or ESS capabilities are marked and require 1023186904Ssam * the beacon have a TDMA ie present. 1024186904Ssam */ 1025186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1026186904Ssam const struct ieee80211_tdma_param *tdma = 1027186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1028189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1029186904Ssam 1030186904Ssam if (tdma == NULL) 1031186904Ssam fail |= MATCH_TDMA_NOIE; 1032189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1033189980Ssam fail |= MATCH_TDMA_VERSION; 1034186904Ssam else if (tdma->tdma_slot != 0) 1035186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1036186904Ssam else if (tdma_isfull(tdma)) 1037186904Ssam fail |= MATCH_TDMA_NOSLOT; 1038186904Ssam#if 0 1039186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1040186904Ssam fail |= MATCH_TDMA_LOCAL; 1041186904Ssam#endif 1042186904Ssam } 1043186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1044195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1045195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1046195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1047195618Srpaulo /* 1048195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1049195618Srpaulo * and two special ie's that must be present. 1050195618Srpaulo */ 1051195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1052195618Srpaulo fail |= MATCH_CAPINFO; 1053215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1054195618Srpaulo fail |= MATCH_MESH_NOID; 1055195618Srpaulo else if (ms->ms_idlen != 0 && 1056195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1057195618Srpaulo fail |= MATCH_MESHID; 1058196005Ssam#endif 1059170530Ssam } else { 1060170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1061171409Ssam fail |= MATCH_CAPINFO; 1062178354Ssam /* 1063178354Ssam * If 11d is enabled and we're attempting to join a bss 1064178354Ssam * that advertises it's country code then compare our 1065178354Ssam * current settings to what we fetched from the country ie. 1066178354Ssam * If our country code is unspecified or different then do 1067178354Ssam * not attempt to join the bss. We should have already 1068178354Ssam * dispatched an event to user space that identifies the 1069178354Ssam * new country code so our regdomain config should match. 1070178354Ssam */ 1071178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1072178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1073178354Ssam se->se_cc[0] != 0 && 1074178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1075178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1076178354Ssam fail |= MATCH_CC; 1077170530Ssam } 1078178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1079170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1080171409Ssam fail |= MATCH_PRIVACY; 1081170530Ssam } else { 1082170530Ssam /* XXX does this mean privacy is supported or required? */ 1083170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1084171409Ssam fail |= MATCH_PRIVACY; 1085170530Ssam } 1086184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1087184302Ssam rate = check_rate(vap, se->se_chan, se); 1088184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1089171409Ssam fail |= MATCH_RATE; 1090184302Ssam /* 1091184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1092184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1093184302Ssam * in the scan list to 11b and retry the rate check. 1094184302Ssam */ 1095184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1096184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1097184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1098184302Ssam fail &= ~MATCH_RATE; 1099184302Ssam se0->se_flags |= STA_DEMOTE11B; 1100184302Ssam } 1101184302Ssam } 1102184302Ssam } else if (rate < 2*24) { 1103184302Ssam /* 1104184302Ssam * This is an 11b-only ap. Check the desired mode in 1105184302Ssam * case that needs to be honored (mode 11g filters out 1106184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1107184302Ssam * in scanning to be demoted. 1108184302Ssam * 1109184302Ssam * NB: we cheat a bit here by looking at the max rate; 1110184302Ssam * we could/should check the rates. 1111184302Ssam */ 1112184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1113184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1114184302Ssam fail |= MATCH_RATE; 1115184302Ssam else 1116184302Ssam se0->se_flags |= STA_DEMOTE11B; 1117184302Ssam } 1118170530Ssam if (ss->ss_nssid != 0 && 1119171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1120171409Ssam fail |= MATCH_SSID; 1121178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1122178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1123178354Ssam fail |= MATCH_BSSID; 1124170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1125171409Ssam fail |= MATCH_FAILS; 1126170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1127171409Ssam fail |= MATCH_NOTSEEN; 1128170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1129171409Ssam fail |= MATCH_RSSI; 1130170530Ssam#ifdef IEEE80211_DEBUG 1131178354Ssam if (ieee80211_msg(vap, debug)) { 1132170530Ssam printf(" %c %s", 1133171409Ssam fail & MATCH_FAILS ? '=' : 1134171409Ssam fail & MATCH_NOTSEEN ? '^' : 1135178354Ssam fail & MATCH_CC ? '$' : 1136186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1137186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1138189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1139189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1140189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1141189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1142186904Ssam#endif 1143195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1144171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1145170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1146171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1147170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1148171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1149171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1150170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1151171409Ssam fail & MATCH_RATE ? '!' : ' '); 1152170530Ssam printf(" %4s%c", 1153170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1154189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1155171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1156170530Ssam printf(" %3s%c ", 1157170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1158170530Ssam "wep" : "no", 1159171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1160170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1161195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1162170530Ssam } 1163170530Ssam#endif 1164170530Ssam return fail; 1165170530Ssam} 1166170530Ssam 1167170530Ssamstatic void 1168170530Ssamsta_update_notseen(struct sta_table *st) 1169170530Ssam{ 1170170530Ssam struct sta_entry *se; 1171170530Ssam 1172206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1173170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1174170530Ssam /* 1175170530Ssam * If seen the reset and don't bump the count; 1176170530Ssam * otherwise bump the ``not seen'' count. Note 1177170530Ssam * that this insures that stations for which we 1178170530Ssam * see frames while not scanning but not during 1179170530Ssam * this scan will not be penalized. 1180170530Ssam */ 1181170530Ssam if (se->se_seen) 1182170530Ssam se->se_seen = 0; 1183170530Ssam else 1184170530Ssam se->se_notseen++; 1185170530Ssam } 1186206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1187170530Ssam} 1188170530Ssam 1189170530Ssamstatic void 1190170530Ssamsta_dec_fails(struct sta_table *st) 1191170530Ssam{ 1192170530Ssam struct sta_entry *se; 1193170530Ssam 1194206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1195170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1196170530Ssam if (se->se_fails) 1197170530Ssam se->se_fails--; 1198206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1199170530Ssam} 1200170530Ssam 1201170530Ssamstatic struct sta_entry * 1202178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1203170530Ssam{ 1204170530Ssam struct sta_table *st = ss->ss_priv; 1205170530Ssam struct sta_entry *se, *selbs = NULL; 1206170530Ssam 1207178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1208170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1209206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1210170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1211184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1212178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1213170530Ssam if (selbs == NULL) 1214170530Ssam selbs = se; 1215170530Ssam else if (sta_compare(se, selbs) > 0) 1216170530Ssam selbs = se; 1217170530Ssam } 1218170530Ssam } 1219206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1220170530Ssam 1221170530Ssam return selbs; 1222170530Ssam} 1223170530Ssam 1224170530Ssam/* 1225170530Ssam * Pick an ap or ibss network to join or find a channel 1226170530Ssam * to use to start an ibss network. 1227170530Ssam */ 1228170530Ssamstatic int 1229178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1230170530Ssam{ 1231170530Ssam struct sta_table *st = ss->ss_priv; 1232170530Ssam struct sta_entry *selbs; 1233184274Ssam struct ieee80211_channel *chan; 1234170530Ssam 1235178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1236178354Ssam ("wrong mode %u", vap->iv_opmode)); 1237170530Ssam 1238170530Ssam if (st->st_newscan) { 1239170530Ssam sta_update_notseen(st); 1240170530Ssam st->st_newscan = 0; 1241170530Ssam } 1242170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1243170530Ssam /* 1244170530Ssam * Manual/background scan, don't select+join the 1245170530Ssam * bss, just return. The scanning framework will 1246170530Ssam * handle notification that this has completed. 1247170530Ssam */ 1248170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1249170530Ssam return 1; 1250170530Ssam } 1251170530Ssam /* 1252170530Ssam * Automatic sequencing; look for a candidate and 1253170530Ssam * if found join the network. 1254170530Ssam */ 1255170530Ssam /* NB: unlocked read should be ok */ 1256170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1257178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1258170530Ssam "%s: no scan candidate\n", __func__); 1259178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1260178354Ssam return 0; 1261170530Ssamnotfound: 1262170530Ssam /* 1263170530Ssam * If nothing suitable was found decrement 1264170530Ssam * the failure counts so entries will be 1265170530Ssam * reconsidered the next time around. We 1266170530Ssam * really want to do this only for sta's 1267170530Ssam * where we've previously had some success. 1268170530Ssam */ 1269170530Ssam sta_dec_fails(st); 1270170530Ssam st->st_newscan = 1; 1271170530Ssam return 0; /* restart scan */ 1272170530Ssam } 1273178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1274178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1275178354Ssam return (selbs != NULL); 1276184274Ssam if (selbs == NULL) 1277170530Ssam goto notfound; 1278184274Ssam chan = selbs->base.se_chan; 1279184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1280184302Ssam chan = demote11b(vap, chan); 1281184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1282184274Ssam goto notfound; 1283170530Ssam return 1; /* terminate scan */ 1284170530Ssam} 1285170530Ssam 1286170530Ssam/* 1287170530Ssam * Lookup an entry in the scan cache. We assume we're 1288170530Ssam * called from the bottom half or such that we don't need 1289170530Ssam * to block the bottom half so that it's safe to return 1290170530Ssam * a reference to an entry w/o holding the lock on the table. 1291170530Ssam */ 1292170530Ssamstatic struct sta_entry * 1293170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1294170530Ssam{ 1295170530Ssam struct sta_entry *se; 1296170530Ssam int hash = STA_HASH(macaddr); 1297170530Ssam 1298206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1299170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1300170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1301170530Ssam break; 1302206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1303170530Ssam 1304170530Ssam return se; /* NB: unlocked */ 1305170530Ssam} 1306170530Ssam 1307170530Ssamstatic void 1308178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1309170530Ssam{ 1310178354Ssam struct ieee80211com *ic = vap->iv_ic; 1311178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1312170530Ssam struct sta_table *st = ss->ss_priv; 1313178354Ssam enum ieee80211_phymode mode; 1314170530Ssam struct sta_entry *se, *selbs; 1315178354Ssam uint8_t roamRate, curRate, ucastRate; 1316170530Ssam int8_t roamRssi, curRssi; 1317170530Ssam 1318170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1319170530Ssam if (se == NULL) { 1320170530Ssam /* XXX something is wrong */ 1321170530Ssam return; 1322170530Ssam } 1323170530Ssam 1324178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1325178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1326178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1327344223Savos KASSERT(roamRate != 0 && roamRssi != 0, ("iv_roamparms are not" 1328344223Savos "initialized for %s mode!", ieee80211_phymode_name[mode])); 1329344223Savos 1330178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1331170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1332170530Ssam curRssi = ic->ic_node_getrssi(ni); 1333178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1334178354Ssam curRate = ni->ni_txrate; 1335178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1336170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1337170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1338170530Ssam } else { 1339170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1340178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1341170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1342170530Ssam } 1343170530Ssam /* 1344170530Ssam * Check if a new ap should be used and switch. 1345170530Ssam * XXX deauth current ap 1346170530Ssam */ 1347170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1348297405Sadrian if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1349170530Ssam /* 1350170530Ssam * Scan cache contents are too old; force a scan now 1351170530Ssam * if possible so we have current state to make a 1352170530Ssam * decision with. We don't kick off a bg scan if 1353170530Ssam * we're using dynamic turbo and boosted or if the 1354170530Ssam * channel is busy. 1355170530Ssam * XXX force immediate switch on scan complete 1356170530Ssam */ 1357170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1358297405Sadrian ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1359178354Ssam ieee80211_bg_scan(vap, 0); 1360170530Ssam return; 1361170530Ssam } 1362170530Ssam se->base.se_rssi = curRssi; 1363178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1364170530Ssam if (selbs != NULL && selbs != se) { 1365184274Ssam struct ieee80211_channel *chan; 1366184274Ssam 1367178354Ssam IEEE80211_DPRINTF(vap, 1368170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1369170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1370170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1371170530Ssam curRate, roamRate, curRssi, roamRssi); 1372184274Ssam 1373184274Ssam chan = selbs->base.se_chan; 1374184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1375184302Ssam chan = demote11b(vap, chan); 1376184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1377170530Ssam } 1378170530Ssam } 1379170530Ssam} 1380170530Ssam 1381170530Ssam/* 1382170530Ssam * Age entries in the scan cache. 1383170530Ssam * XXX also do roaming since it's convenient 1384170530Ssam */ 1385170530Ssamstatic void 1386170530Ssamsta_age(struct ieee80211_scan_state *ss) 1387170530Ssam{ 1388178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1389170530Ssam 1390178354Ssam adhoc_age(ss); 1391170530Ssam /* 1392170530Ssam * If rate control is enabled check periodically to see if 1393170530Ssam * we should roam from our current connection to one that 1394170530Ssam * might be better. This only applies when we're operating 1395170530Ssam * in sta mode and automatic roaming is set. 1396170530Ssam * XXX defer if busy 1397170530Ssam * XXX repeater station 1398170530Ssam * XXX do when !bgscan? 1399170530Ssam */ 1400178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1401178354Ssam ("wrong mode %u", vap->iv_opmode)); 1402178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1403213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1404178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1405170530Ssam /* XXX vap is implicit */ 1406178354Ssam sta_roam_check(ss, vap); 1407170530Ssam} 1408170530Ssam 1409170530Ssam/* 1410170530Ssam * Iterate over the entries in the scan cache, invoking 1411170530Ssam * the callback function on each one. 1412170530Ssam */ 1413170530Ssamstatic void 1414170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1415170530Ssam ieee80211_scan_iter_func *f, void *arg) 1416170530Ssam{ 1417170530Ssam struct sta_table *st = ss->ss_priv; 1418170530Ssam struct sta_entry *se; 1419170530Ssam u_int gen; 1420170530Ssam 1421283556Sadrian IEEE80211_SCAN_ITER_LOCK(st); 1422178354Ssam gen = st->st_scaniter++; 1423170530Ssamrestart: 1424206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1425170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1426170530Ssam if (se->se_scangen != gen) { 1427170530Ssam se->se_scangen = gen; 1428170530Ssam /* update public state */ 1429170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1430206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1431170530Ssam (*f)(arg, &se->base); 1432170530Ssam goto restart; 1433170530Ssam } 1434170530Ssam } 1435206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1436170530Ssam 1437283556Sadrian IEEE80211_SCAN_ITER_UNLOCK(st); 1438170530Ssam} 1439170530Ssam 1440170530Ssamstatic void 1441170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1442170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1443170530Ssam{ 1444170530Ssam struct sta_table *st = ss->ss_priv; 1445170530Ssam struct sta_entry *se; 1446170530Ssam 1447170530Ssam se = sta_lookup(st, macaddr); 1448170530Ssam if (se != NULL) { 1449170530Ssam se->se_fails++; 1450170530Ssam se->se_lastfail = ticks; 1451178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1452170530Ssam macaddr, "%s: reason %u fails %u", 1453170530Ssam __func__, reason, se->se_fails); 1454170530Ssam } 1455170530Ssam} 1456170530Ssam 1457170530Ssamstatic void 1458170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1459170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1460170530Ssam{ 1461170530Ssam struct sta_table *st = ss->ss_priv; 1462170530Ssam struct sta_entry *se; 1463170530Ssam 1464170530Ssam se = sta_lookup(st, macaddr); 1465170530Ssam if (se != NULL) { 1466170530Ssam#if 0 1467170530Ssam se->se_fails = 0; 1468178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1469170530Ssam macaddr, "%s: fails %u", 1470170530Ssam __func__, se->se_fails); 1471170530Ssam#endif 1472170530Ssam se->se_lastassoc = ticks; 1473170530Ssam } 1474170530Ssam} 1475170530Ssam 1476170530Ssamstatic const struct ieee80211_scanner sta_default = { 1477170530Ssam .scan_name = "default", 1478170530Ssam .scan_attach = sta_attach, 1479170530Ssam .scan_detach = sta_detach, 1480170530Ssam .scan_start = sta_start, 1481170530Ssam .scan_restart = sta_restart, 1482170530Ssam .scan_cancel = sta_cancel, 1483170530Ssam .scan_end = sta_pick_bss, 1484170530Ssam .scan_flush = sta_flush, 1485170530Ssam .scan_add = sta_add, 1486170530Ssam .scan_age = sta_age, 1487170530Ssam .scan_iterate = sta_iterate, 1488170530Ssam .scan_assoc_fail = sta_assoc_fail, 1489170530Ssam .scan_assoc_success = sta_assoc_success, 1490170530Ssam}; 1491195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1492170530Ssam 1493170530Ssam/* 1494170530Ssam * Adhoc mode-specific support. 1495170530Ssam */ 1496170530Ssam 1497170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1498170530Ssam{ 5180, 5200, 5220, 5240 }; 1499170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1500170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1501170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1502170530Ssam{ 5170, 5190, 5210, 5230 }; 1503170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1504170530Ssam{ 2457, 2462 }; 1505170530Ssam 1506170530Ssamstatic const struct scanlist adhocScanTable[] = { 1507170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1508170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1509170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1510170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1511170530Ssam { .list = NULL } 1512170530Ssam}; 1513170530Ssam#undef X 1514170530Ssam 1515170530Ssam/* 1516170530Ssam * Start an adhoc-mode scan by populating the channel list. 1517170530Ssam */ 1518170530Ssamstatic int 1519178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1520170530Ssam{ 1521170530Ssam struct sta_table *st = ss->ss_priv; 1522170530Ssam 1523178354Ssam makescanlist(ss, vap, adhocScanTable); 1524176653Ssam 1525178354Ssam if (ss->ss_mindwell == 0) 1526178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1527178354Ssam if (ss->ss_maxdwell == 0) 1528178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1529176653Ssam 1530178354Ssam st->st_scangen++; 1531170530Ssam st->st_newscan = 1; 1532170530Ssam 1533170530Ssam return 0; 1534170530Ssam} 1535170530Ssam 1536170530Ssam/* 1537170530Ssam * Select a channel to start an adhoc network on. 1538170530Ssam * The channel list was populated with appropriate 1539170530Ssam * channels so select one that looks least occupied. 1540170530Ssam */ 1541170530Ssamstatic struct ieee80211_channel * 1542178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1543170530Ssam{ 1544170530Ssam struct sta_table *st = ss->ss_priv; 1545170530Ssam struct sta_entry *se; 1546170530Ssam struct ieee80211_channel *c, *bestchan; 1547170530Ssam int i, bestrssi, maxrssi; 1548170530Ssam 1549170530Ssam bestchan = NULL; 1550170530Ssam bestrssi = -1; 1551170530Ssam 1552206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1553170530Ssam for (i = 0; i < ss->ss_last; i++) { 1554170530Ssam c = ss->ss_chans[i]; 1555178354Ssam /* never consider a channel with radar */ 1556178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1557176653Ssam continue; 1558178354Ssam /* skip channels disallowed by regulatory settings */ 1559178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1560178354Ssam continue; 1561178354Ssam /* check channel attributes for band compatibility */ 1562178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1563178354Ssam continue; 1564170530Ssam maxrssi = 0; 1565170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1566170530Ssam if (se->base.se_chan != c) 1567170530Ssam continue; 1568170530Ssam if (se->base.se_rssi > maxrssi) 1569170530Ssam maxrssi = se->base.se_rssi; 1570170530Ssam } 1571170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1572170530Ssam bestchan = c; 1573170530Ssam } 1574206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1575170530Ssam 1576170530Ssam return bestchan; 1577170530Ssam} 1578170530Ssam 1579170530Ssam/* 1580170530Ssam * Pick an ibss network to join or find a channel 1581170530Ssam * to use to start an ibss network. 1582170530Ssam */ 1583170530Ssamstatic int 1584178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1585170530Ssam{ 1586170530Ssam struct sta_table *st = ss->ss_priv; 1587170530Ssam struct sta_entry *selbs; 1588170530Ssam struct ieee80211_channel *chan; 1589245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1590170530Ssam 1591178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1592195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1593195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1594178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1595170530Ssam 1596170530Ssam if (st->st_newscan) { 1597170530Ssam sta_update_notseen(st); 1598170530Ssam st->st_newscan = 0; 1599170530Ssam } 1600170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1601170530Ssam /* 1602170530Ssam * Manual/background scan, don't select+join the 1603170530Ssam * bss, just return. The scanning framework will 1604170530Ssam * handle notification that this has completed. 1605170530Ssam */ 1606170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1607170530Ssam return 1; 1608170530Ssam } 1609170530Ssam /* 1610170530Ssam * Automatic sequencing; look for a candidate and 1611170530Ssam * if found join the network. 1612170530Ssam */ 1613170530Ssam /* NB: unlocked read should be ok */ 1614170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1615178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1616170530Ssam "%s: no scan candidate\n", __func__); 1617178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1618178354Ssam return 0; 1619170530Ssamnotfound: 1620186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1621186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1622186904Ssam if (vap->iv_des_nssid && 1623186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1624186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1625186904Ssam#else 1626178354Ssam if (vap->iv_des_nssid) { 1627186904Ssam#endif 1628170530Ssam /* 1629170530Ssam * No existing adhoc network to join and we have 1630170530Ssam * an ssid; start one up. If no channel was 1631170530Ssam * specified, try to select a channel. 1632170530Ssam */ 1633178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1634178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1635183421Ssam chan = adhoc_pick_channel(ss, 0); 1636178354Ssam } else 1637178354Ssam chan = vap->iv_des_chan; 1638170530Ssam if (chan != NULL) { 1639245928Sadrian /* 1640245928Sadrian * Create a HT capable IBSS; the per-node 1641245928Sadrian * probe request/response will result in 1642245928Sadrian * "correct" rate control capabilities being 1643245928Sadrian * negotiated. 1644245928Sadrian */ 1645245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1646245928Sadrian chan, vap->iv_flags_ht); 1647178354Ssam ieee80211_create_ibss(vap, chan); 1648170530Ssam return 1; 1649170530Ssam } 1650170530Ssam } 1651170530Ssam /* 1652170530Ssam * If nothing suitable was found decrement 1653170530Ssam * the failure counts so entries will be 1654170530Ssam * reconsidered the next time around. We 1655170530Ssam * really want to do this only for sta's 1656170530Ssam * where we've previously had some success. 1657170530Ssam */ 1658170530Ssam sta_dec_fails(st); 1659170530Ssam st->st_newscan = 1; 1660170530Ssam return 0; /* restart scan */ 1661170530Ssam } 1662178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1663178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1664178354Ssam return (selbs != NULL); 1665184274Ssam if (selbs == NULL) 1666170530Ssam goto notfound; 1667184274Ssam chan = selbs->base.se_chan; 1668184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1669184302Ssam chan = demote11b(vap, chan); 1670245928Sadrian /* 1671245928Sadrian * If HT is available, make it a possibility here. 1672245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1673245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1674245928Sadrian * to any subsequent nodes that support it. 1675245928Sadrian */ 1676245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1677245928Sadrian chan, vap->iv_flags_ht); 1678184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1679184274Ssam goto notfound; 1680170530Ssam return 1; /* terminate scan */ 1681170530Ssam} 1682170530Ssam 1683170530Ssam/* 1684170530Ssam * Age entries in the scan cache. 1685170530Ssam */ 1686170530Ssamstatic void 1687170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1688170530Ssam{ 1689170530Ssam struct sta_table *st = ss->ss_priv; 1690170530Ssam struct sta_entry *se, *next; 1691170530Ssam 1692206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1693170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1694170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1695170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1696170530Ssam LIST_REMOVE(se, se_hash); 1697178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1698283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 1699170530Ssam } 1700170530Ssam } 1701206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1702170530Ssam} 1703170530Ssam 1704170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1705170530Ssam .scan_name = "default", 1706170530Ssam .scan_attach = sta_attach, 1707170530Ssam .scan_detach = sta_detach, 1708170530Ssam .scan_start = adhoc_start, 1709170530Ssam .scan_restart = sta_restart, 1710170530Ssam .scan_cancel = sta_cancel, 1711170530Ssam .scan_end = adhoc_pick_bss, 1712170530Ssam .scan_flush = sta_flush, 1713178354Ssam .scan_pickchan = adhoc_pick_channel, 1714170530Ssam .scan_add = sta_add, 1715170530Ssam .scan_age = adhoc_age, 1716170530Ssam .scan_iterate = sta_iterate, 1717170530Ssam .scan_assoc_fail = sta_assoc_fail, 1718170530Ssam .scan_assoc_success = sta_assoc_success, 1719170530Ssam}; 1720195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1721195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1722170530Ssam 1723178354Ssamstatic int 1724178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1725178354Ssam{ 1726178354Ssam struct sta_table *st = ss->ss_priv; 1727178354Ssam 1728178354Ssam makescanlist(ss, vap, staScanTable); 1729178354Ssam 1730178354Ssam if (ss->ss_mindwell == 0) 1731178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1732178354Ssam if (ss->ss_maxdwell == 0) 1733178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1734178354Ssam 1735178354Ssam st->st_scangen++; 1736178354Ssam st->st_newscan = 1; 1737178354Ssam 1738178354Ssam return 0; 1739178354Ssam} 1740178354Ssam 1741170530Ssam/* 1742178354Ssam * Cancel an ongoing scan. 1743170530Ssam */ 1744170530Ssamstatic int 1745178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1746170530Ssam{ 1747178354Ssam return 0; 1748178354Ssam} 1749178354Ssam 1750178354Ssam/* 1751178354Ssam * Pick a quiet channel to use for ap operation. 1752178354Ssam */ 1753178354Ssamstatic struct ieee80211_channel * 1754178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1755178354Ssam{ 1756178354Ssam struct sta_table *st = ss->ss_priv; 1757178354Ssam struct ieee80211_channel *bestchan = NULL; 1758178354Ssam int i; 1759178354Ssam 1760178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1761178354Ssam /* NB: use scan list order to preserve channel preference */ 1762178354Ssam for (i = 0; i < ss->ss_last; i++) { 1763178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1764178354Ssam /* 1765178354Ssam * If the channel is unoccupied the max rssi 1766178354Ssam * should be zero; just take it. Otherwise 1767178354Ssam * track the channel with the lowest rssi and 1768178354Ssam * use that when all channels appear occupied. 1769178354Ssam */ 1770178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1771178354Ssam continue; 1772178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1773178354Ssam continue; 1774178354Ssam /* check channel attributes for band compatibility */ 1775178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1776178354Ssam continue; 1777186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1778178354Ssam /* XXX channel have interference */ 1779178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1780178354Ssam /* XXX use other considerations */ 1781178354Ssam return chan; 1782170530Ssam } 1783178354Ssam if (bestchan == NULL || 1784178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1785178354Ssam bestchan = chan; 1786178354Ssam } 1787178354Ssam return bestchan; 1788178354Ssam} 1789178354Ssam 1790178354Ssam/* 1791178354Ssam * Pick a quiet channel to use for ap operation. 1792178354Ssam */ 1793178354Ssamstatic int 1794178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1795178354Ssam{ 1796178354Ssam struct ieee80211com *ic = vap->iv_ic; 1797178354Ssam struct ieee80211_channel *bestchan; 1798178354Ssam 1799178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1800178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1801178354Ssam bestchan = ap_pick_channel(ss, 0); 1802178354Ssam if (bestchan == NULL) { 1803178354Ssam /* no suitable channel, should not happen */ 1804178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1805178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1806178354Ssam /* XXX print something? */ 1807178354Ssam return 0; /* restart scan */ 1808178354Ssam } 1809178354Ssam /* 1810178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1811178354Ssam */ 1812178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1813178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1814178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1815178354Ssam if (bestchan == NULL) { 1816178354Ssam /* should never happen ?? */ 1817178354Ssam return 0; 1818170530Ssam } 1819170530Ssam } 1820178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1821178354Ssam /* 1822178354Ssam * Manual/background scan, don't select+join the 1823178354Ssam * bss, just return. The scanning framework will 1824178354Ssam * handle notification that this has completed. 1825178354Ssam */ 1826178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1827178354Ssam return 1; 1828178354Ssam } 1829178354Ssam ieee80211_create_ibss(vap, 1830193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1831178354Ssam return 1; 1832170530Ssam} 1833170530Ssam 1834178354Ssamstatic const struct ieee80211_scanner ap_default = { 1835178354Ssam .scan_name = "default", 1836178354Ssam .scan_attach = sta_attach, 1837178354Ssam .scan_detach = sta_detach, 1838178354Ssam .scan_start = ap_start, 1839178354Ssam .scan_restart = sta_restart, 1840178354Ssam .scan_cancel = ap_cancel, 1841178354Ssam .scan_end = ap_end, 1842178354Ssam .scan_flush = sta_flush, 1843178354Ssam .scan_pickchan = ap_pick_channel, 1844178354Ssam .scan_add = sta_add, 1845178354Ssam .scan_age = adhoc_age, 1846178354Ssam .scan_iterate = sta_iterate, 1847178354Ssam .scan_assoc_success = sta_assoc_success, 1848178354Ssam .scan_assoc_fail = sta_assoc_fail, 1849170530Ssam}; 1850195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1851178354Ssam 1852195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1853178354Ssam/* 1854195618Srpaulo * Pick an mbss network to join or find a channel 1855195618Srpaulo * to use to start an mbss network. 1856178354Ssam */ 1857195618Srpaulostatic int 1858195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1859195618Srpaulo{ 1860195618Srpaulo struct sta_table *st = ss->ss_priv; 1861195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1862195618Srpaulo struct sta_entry *selbs; 1863195618Srpaulo struct ieee80211_channel *chan; 1864195618Srpaulo 1865195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1866195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1867195618Srpaulo 1868195618Srpaulo if (st->st_newscan) { 1869195618Srpaulo sta_update_notseen(st); 1870195618Srpaulo st->st_newscan = 0; 1871195618Srpaulo } 1872195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1873195618Srpaulo /* 1874195618Srpaulo * Manual/background scan, don't select+join the 1875195618Srpaulo * bss, just return. The scanning framework will 1876195618Srpaulo * handle notification that this has completed. 1877195618Srpaulo */ 1878195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1879195618Srpaulo return 1; 1880195618Srpaulo } 1881195618Srpaulo /* 1882195618Srpaulo * Automatic sequencing; look for a candidate and 1883195618Srpaulo * if found join the network. 1884195618Srpaulo */ 1885195618Srpaulo /* NB: unlocked read should be ok */ 1886195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1887195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1888195618Srpaulo "%s: no scan candidate\n", __func__); 1889195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1890195618Srpaulo return 0; 1891195618Srpaulonotfound: 1892195618Srpaulo if (ms->ms_idlen != 0) { 1893195618Srpaulo /* 1894195618Srpaulo * No existing mbss network to join and we have 1895195618Srpaulo * a meshid; start one up. If no channel was 1896195618Srpaulo * specified, try to select a channel. 1897195618Srpaulo */ 1898195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1899195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1900195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1901195618Srpaulo 1902195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1903195618Srpaulo if (chan != NULL) 1904195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1905195618Srpaulo chan, vap->iv_flags_ht); 1906195618Srpaulo } else 1907195618Srpaulo chan = vap->iv_des_chan; 1908195618Srpaulo if (chan != NULL) { 1909195618Srpaulo ieee80211_create_ibss(vap, chan); 1910195618Srpaulo return 1; 1911195618Srpaulo } 1912195618Srpaulo } 1913195618Srpaulo /* 1914195618Srpaulo * If nothing suitable was found decrement 1915195618Srpaulo * the failure counts so entries will be 1916195618Srpaulo * reconsidered the next time around. We 1917195618Srpaulo * really want to do this only for sta's 1918195618Srpaulo * where we've previously had some success. 1919195618Srpaulo */ 1920195618Srpaulo sta_dec_fails(st); 1921195618Srpaulo st->st_newscan = 1; 1922195618Srpaulo return 0; /* restart scan */ 1923195618Srpaulo } 1924195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1925195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1926195618Srpaulo return (selbs != NULL); 1927195618Srpaulo if (selbs == NULL) 1928195618Srpaulo goto notfound; 1929195618Srpaulo chan = selbs->base.se_chan; 1930195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1931195618Srpaulo chan = demote11b(vap, chan); 1932195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1933195618Srpaulo goto notfound; 1934195618Srpaulo return 1; /* terminate scan */ 1935195618Srpaulo} 1936195618Srpaulo 1937195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1938195618Srpaulo .scan_name = "default", 1939195618Srpaulo .scan_attach = sta_attach, 1940195618Srpaulo .scan_detach = sta_detach, 1941195618Srpaulo .scan_start = adhoc_start, 1942195618Srpaulo .scan_restart = sta_restart, 1943195618Srpaulo .scan_cancel = sta_cancel, 1944195618Srpaulo .scan_end = mesh_pick_bss, 1945195618Srpaulo .scan_flush = sta_flush, 1946195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1947195618Srpaulo .scan_add = sta_add, 1948195618Srpaulo .scan_age = adhoc_age, 1949195618Srpaulo .scan_iterate = sta_iterate, 1950195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1951195618Srpaulo .scan_assoc_success = sta_assoc_success, 1952195618Srpaulo}; 1953195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1954195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1955