ieee80211_scan_sta.c revision 343509
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 343509 2019-01-28 01:12:20Z 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) { 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; 598343509Savos 599343509Savos switch (mode) { 600343509Savos case IEEE80211_MODE_11B: 601343509Savos if (vap->iv_des_mode == IEEE80211_MODE_11B) 602343509Savos break; 603343509Savos 604170530Ssam /* 605343509Savos * The scan table marks 2.4Ghz channels as b 606343509Savos * so if the desired mode is 11g / 11ng, 607343509Savos * then use the 11b channel list but upgrade the mode. 608343509Savos * 609343509Savos * NB: 11b -> AUTO lets add_channels upgrade an 610343509Savos * 11b channel to 11g if available. 611170530Ssam */ 612343509Savos if (vap->iv_des_mode == IEEE80211_MODE_AUTO || 613343509Savos vap->iv_des_mode == IEEE80211_MODE_11G || 614343509Savos vap->iv_des_mode == IEEE80211_MODE_11NG) { 615343509Savos mode = vap->iv_des_mode; 616343509Savos break; 617170530Ssam } 618343509Savos 619343509Savos continue; 620343509Savos case IEEE80211_MODE_11A: 621343509Savos /* Use 11a channel list for 11na mode */ 622343509Savos if (vap->iv_des_mode == IEEE80211_MODE_11NA) { 623343509Savos mode = vap->iv_des_mode; 624343509Savos break; 625343509Savos } 626343509Savos 627343509Savos /* FALLTHROUGH */ 628343509Savos default: 629170530Ssam /* 630343509Savos * If a desired mode was specified, scan only 631343509Savos * channels that satisfy that constraint. 632170530Ssam */ 633343509Savos if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 634343509Savos vap->iv_des_mode != mode) 635343509Savos continue; 636170530Ssam } 637343509Savos 638170530Ssam#ifdef IEEE80211_F_XR 639170530Ssam /* XR does not operate on turbo channels */ 640178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 641170530Ssam (mode == IEEE80211_MODE_TURBO_A || 642170530Ssam mode == IEEE80211_MODE_TURBO_G || 643170530Ssam mode == IEEE80211_MODE_STURBO_A)) 644170530Ssam continue; 645170530Ssam#endif 646170530Ssam /* 647170530Ssam * Add the list of the channels; any that are not 648170530Ssam * in the master channel list will be discarded. 649170530Ssam */ 650178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 651170530Ssam } 652170530Ssam 653170530Ssam /* 654178354Ssam * Add the channels from the ic that are not present 655178354Ssam * in the table. 656170530Ssam */ 657178354Ssam sweepchannels(ss, vap, table); 658178354Ssam} 659170530Ssam 660178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 661178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 662178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 663178354Ssam{ 5170, 5190, 5210, 5230 }; 664178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 665178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 666178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 667178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 668178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 669178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 670178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 671178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 672178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 673178354Ssam{ 2484 }; 674178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 675178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 676178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 677178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 678178354Ssam#ifdef ATH_TURBO_SCAN 679178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 680178354Ssam{ 5210, 5250, 5290 }; 681178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 682178354Ssam{ 5760, 5800 }; 683178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 684178354Ssam{ 5540, 5580, 5620, 5660 }; 685178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 686178354Ssam{ 2437 }; 687178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 688178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 689178354Ssam#endif /* ATH_TURBO_SCAN */ 690170530Ssam 691178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 692170530Ssam 693178354Ssamstatic const struct scanlist staScanTable[] = { 694178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 695178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 696178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 697178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 698178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 699178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 700178354Ssam#ifdef ATH_TURBO_SCAN 701178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 702178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 703178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 704178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 705178354Ssam#endif /* ATH_TURBO_SCAN */ 706178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 707178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 708178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 709178354Ssam#ifdef ATH_TURBO_SCAN 710178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 711178354Ssam#endif /* ATH_TURBO_SCAN */ 712178354Ssam { .list = NULL } 713178354Ssam}; 714178354Ssam 715178354Ssam/* 716178354Ssam * Start a station-mode scan by populating the channel list. 717178354Ssam */ 718178354Ssamstatic int 719178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 720178354Ssam{ 721178354Ssam struct sta_table *st = ss->ss_priv; 722178354Ssam 723178354Ssam makescanlist(ss, vap, staScanTable); 724178354Ssam 725178354Ssam if (ss->ss_mindwell == 0) 726178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 727178354Ssam if (ss->ss_maxdwell == 0) 728178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 729178354Ssam 730178354Ssam st->st_scangen++; 731170530Ssam st->st_newscan = 1; 732170530Ssam 733170530Ssam return 0; 734170530Ssam} 735170530Ssam 736170530Ssam/* 737178354Ssam * Restart a scan, typically a bg scan but can 738178354Ssam * also be a fg scan that came up empty. 739170530Ssam */ 740170530Ssamstatic int 741178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 742170530Ssam{ 743170530Ssam struct sta_table *st = ss->ss_priv; 744170530Ssam 745170530Ssam st->st_newscan = 1; 746170530Ssam return 0; 747170530Ssam} 748170530Ssam 749170530Ssam/* 750170530Ssam * Cancel an ongoing scan. 751170530Ssam */ 752170530Ssamstatic int 753178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 754170530Ssam{ 755170530Ssam return 0; 756170530Ssam} 757170530Ssam 758184302Ssam/* 759184302Ssam * Demote any supplied 11g channel to 11b. There should 760184302Ssam * always be an 11b channel but we check anyway... 761184302Ssam */ 762184302Ssamstatic struct ieee80211_channel * 763184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 764184302Ssam{ 765184302Ssam struct ieee80211_channel *c; 766178354Ssam 767184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 768184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 769184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 770184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 771184302Ssam IEEE80211_CHAN_B); 772184302Ssam if (c != NULL) 773184302Ssam chan = c; 774184302Ssam } 775184302Ssam return chan; 776184302Ssam} 777184302Ssam 778178354Ssamstatic int 779170530Ssammaxrate(const struct ieee80211_scan_entry *se) 780170530Ssam{ 781178354Ssam const struct ieee80211_ie_htcap *htcap = 782178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 783219601Sbschmidt int rmax, r, i, txstream; 784178354Ssam uint16_t caps; 785219601Sbschmidt uint8_t txparams; 786170530Ssam 787170530Ssam rmax = 0; 788178354Ssam if (htcap != NULL) { 789178354Ssam /* 790178354Ssam * HT station; inspect supported MCS and then adjust 791219601Sbschmidt * rate by channel width. 792178354Ssam */ 793219601Sbschmidt txparams = htcap->hc_mcsset[12]; 794219601Sbschmidt if (txparams & 0x3) { 795219601Sbschmidt /* 796219601Sbschmidt * TX MCS parameters defined and not equal to RX, 797219601Sbschmidt * extract the number of spartial streams and 798219601Sbschmidt * map it to the highest MCS rate. 799219601Sbschmidt */ 800219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 801219601Sbschmidt i = txstream * 8 - 1; 802219601Sbschmidt } else 803219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 804178354Ssam if (i >= 0) { 805298359Savos caps = le16dec(&htcap->hc_cap); 806219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 807219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 808178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 809219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 810219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 811219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 812219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 813178354Ssam else 814219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 815178354Ssam } 816178354Ssam } 817170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 818170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 819170530Ssam if (r > rmax) 820170530Ssam rmax = r; 821170530Ssam } 822170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 823170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 824170530Ssam if (r > rmax) 825170530Ssam rmax = r; 826170530Ssam } 827170530Ssam return rmax; 828170530Ssam} 829170530Ssam 830170530Ssam/* 831170530Ssam * Compare the capabilities of two entries and decide which is 832170530Ssam * more desirable (return >0 if a is considered better). Note 833170530Ssam * that we assume compatibility/usability has already been checked 834170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 835170530Ssam * Used to select the best scan candidate for association in a BSS. 836170530Ssam */ 837170530Ssamstatic int 838170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 839170530Ssam{ 840170530Ssam#define PREFER(_a,_b,_what) do { \ 841170530Ssam if (((_a) ^ (_b)) & (_what)) \ 842170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 843170530Ssam} while (0) 844178354Ssam int maxa, maxb; 845170530Ssam int8_t rssia, rssib; 846170530Ssam int weight; 847170530Ssam 848170530Ssam /* privacy support */ 849170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 850170530Ssam IEEE80211_CAPINFO_PRIVACY); 851170530Ssam 852170530Ssam /* compare count of previous failures */ 853170530Ssam weight = b->se_fails - a->se_fails; 854170530Ssam if (abs(weight) > 1) 855170530Ssam return weight; 856170530Ssam 857170530Ssam /* 858170530Ssam * Compare rssi. If the two are considered equivalent 859170530Ssam * then fallback to other criteria. We threshold the 860170530Ssam * comparisons to avoid selecting an ap purely by rssi 861170530Ssam * when both values may be good but one ap is otherwise 862170530Ssam * more desirable (e.g. an 11b-only ap with stronger 863170530Ssam * signal than an 11g ap). 864170530Ssam */ 865170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 866170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 867170530Ssam if (abs(rssib - rssia) < 5) { 868170530Ssam /* best/max rate preferred if signal level close enough XXX */ 869170530Ssam maxa = maxrate(&a->base); 870170530Ssam maxb = maxrate(&b->base); 871170530Ssam if (maxa != maxb) 872170530Ssam return maxa - maxb; 873170530Ssam /* XXX use freq for channel preference */ 874170530Ssam /* for now just prefer 5Ghz band to all other bands */ 875178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 876178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 877170530Ssam } 878170530Ssam /* all things being equal, use signal level */ 879170530Ssam return a->base.se_rssi - b->base.se_rssi; 880170530Ssam#undef PREFER 881170530Ssam} 882170530Ssam 883170530Ssam/* 884170530Ssam * Check rate set suitability and return the best supported rate. 885178354Ssam * XXX inspect MCS for HT 886170530Ssam */ 887170530Ssamstatic int 888184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 889184302Ssam const struct ieee80211_scan_entry *se) 890170530Ssam{ 891170530Ssam const struct ieee80211_rateset *srs; 892178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 893170530Ssam const uint8_t *rs; 894170530Ssam 895178354Ssam okrate = badrate = 0; 896170530Ssam 897184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 898170530Ssam nrs = se->se_rates[1]; 899170530Ssam rs = se->se_rates+2; 900178354Ssam /* XXX MCS */ 901184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 902170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 903170530Ssamagain: 904170530Ssam for (i = 0; i < nrs; i++) { 905288086Sadrian r = IEEE80211_RV(rs[i]); 906170530Ssam badrate = r; 907170530Ssam /* 908170530Ssam * Check any fixed rate is included. 909170530Ssam */ 910178354Ssam if (r == ucastrate) 911170530Ssam fixedrate = r; 912170530Ssam /* 913170530Ssam * Check against our supported rates. 914170530Ssam */ 915170530Ssam for (j = 0; j < srs->rs_nrates; j++) 916288086Sadrian if (r == IEEE80211_RV(srs->rs_rates[j])) { 917170530Ssam if (r > okrate) /* NB: track max */ 918170530Ssam okrate = r; 919170530Ssam break; 920170530Ssam } 921170530Ssam 922170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 923170530Ssam /* 924170530Ssam * Don't try joining a BSS, if we don't support 925170530Ssam * one of its basic rates. 926170530Ssam */ 927170530Ssam okrate = 0; 928170530Ssam goto back; 929170530Ssam } 930170530Ssam } 931170530Ssam if (rs == se->se_rates+2) { 932170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 933170530Ssam nrs = se->se_xrates[1]; 934170530Ssam rs = se->se_xrates+2; 935170530Ssam goto again; 936170530Ssam } 937170530Ssam 938170530Ssamback: 939178354Ssam if (okrate == 0 || ucastrate != fixedrate) 940170530Ssam return badrate | IEEE80211_RATE_BASIC; 941170530Ssam else 942288086Sadrian return IEEE80211_RV(okrate); 943170530Ssam} 944170530Ssam 945195618Srpaulostatic __inline int 946195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 947195618Srpaulo{ 948195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 949195618Srpaulo} 950195618Srpaulo 951170530Ssamstatic int 952170530Ssammatch_ssid(const uint8_t *ie, 953170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 954170530Ssam{ 955170530Ssam int i; 956170530Ssam 957170530Ssam for (i = 0; i < nssid; i++) { 958195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 959170530Ssam return 1; 960170530Ssam } 961170530Ssam return 0; 962170530Ssam} 963170530Ssam 964186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 965186904Ssamstatic int 966186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 967186904Ssam{ 968186904Ssam int slot, slotcnt; 969186904Ssam 970186904Ssam slotcnt = tdma->tdma_slotcnt; 971186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 972186904Ssam if (isclr(tdma->tdma_inuse, slot)) 973186904Ssam return 0; 974186904Ssam return 1; 975186904Ssam} 976186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 977186904Ssam 978170530Ssam/* 979170530Ssam * Test a scan candidate for suitability/compatibility. 980170530Ssam */ 981170530Ssamstatic int 982178354Ssammatch_bss(struct ieee80211vap *vap, 983170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 984170530Ssam int debug) 985170530Ssam{ 986178354Ssam struct ieee80211com *ic = vap->iv_ic; 987170530Ssam struct ieee80211_scan_entry *se = &se0->base; 988178354Ssam uint8_t rate; 989178354Ssam int fail; 990170530Ssam 991170530Ssam fail = 0; 992170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 993171409Ssam fail |= MATCH_CHANNEL; 994170530Ssam /* 995170530Ssam * NB: normally the desired mode is used to construct 996170530Ssam * the channel list, but it's possible for the scan 997170530Ssam * cache to include entries for stations outside this 998170530Ssam * list so we check the desired mode here to weed them 999170530Ssam * out. 1000170530Ssam */ 1001178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 1002170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 1003178354Ssam chanflags[vap->iv_des_mode]) 1004171409Ssam fail |= MATCH_CHANNEL; 1005178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 1006170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 1007171409Ssam fail |= MATCH_CAPINFO; 1008186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1009186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 1010186904Ssam /* 1011186904Ssam * Adhoc demo network setup shouldn't really be scanning 1012186904Ssam * but just in case skip stations operating in IBSS or 1013186904Ssam * BSS mode. 1014186904Ssam */ 1015186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1016186904Ssam fail |= MATCH_CAPINFO; 1017186904Ssam /* 1018186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1019186904Ssam * skip if IBSS or ESS capabilities are marked and require 1020186904Ssam * the beacon have a TDMA ie present. 1021186904Ssam */ 1022186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1023186904Ssam const struct ieee80211_tdma_param *tdma = 1024186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1025189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1026186904Ssam 1027186904Ssam if (tdma == NULL) 1028186904Ssam fail |= MATCH_TDMA_NOIE; 1029189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1030189980Ssam fail |= MATCH_TDMA_VERSION; 1031186904Ssam else if (tdma->tdma_slot != 0) 1032186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1033186904Ssam else if (tdma_isfull(tdma)) 1034186904Ssam fail |= MATCH_TDMA_NOSLOT; 1035186904Ssam#if 0 1036186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1037186904Ssam fail |= MATCH_TDMA_LOCAL; 1038186904Ssam#endif 1039186904Ssam } 1040186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1041195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1042195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1043195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1044195618Srpaulo /* 1045195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1046195618Srpaulo * and two special ie's that must be present. 1047195618Srpaulo */ 1048195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1049195618Srpaulo fail |= MATCH_CAPINFO; 1050215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1051195618Srpaulo fail |= MATCH_MESH_NOID; 1052195618Srpaulo else if (ms->ms_idlen != 0 && 1053195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1054195618Srpaulo fail |= MATCH_MESHID; 1055196005Ssam#endif 1056170530Ssam } else { 1057170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1058171409Ssam fail |= MATCH_CAPINFO; 1059178354Ssam /* 1060178354Ssam * If 11d is enabled and we're attempting to join a bss 1061178354Ssam * that advertises it's country code then compare our 1062178354Ssam * current settings to what we fetched from the country ie. 1063178354Ssam * If our country code is unspecified or different then do 1064178354Ssam * not attempt to join the bss. We should have already 1065178354Ssam * dispatched an event to user space that identifies the 1066178354Ssam * new country code so our regdomain config should match. 1067178354Ssam */ 1068178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1069178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1070178354Ssam se->se_cc[0] != 0 && 1071178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1072178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1073178354Ssam fail |= MATCH_CC; 1074170530Ssam } 1075178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1076170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1077171409Ssam fail |= MATCH_PRIVACY; 1078170530Ssam } else { 1079170530Ssam /* XXX does this mean privacy is supported or required? */ 1080170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1081171409Ssam fail |= MATCH_PRIVACY; 1082170530Ssam } 1083184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1084184302Ssam rate = check_rate(vap, se->se_chan, se); 1085184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1086171409Ssam fail |= MATCH_RATE; 1087184302Ssam /* 1088184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1089184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1090184302Ssam * in the scan list to 11b and retry the rate check. 1091184302Ssam */ 1092184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1093184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1094184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1095184302Ssam fail &= ~MATCH_RATE; 1096184302Ssam se0->se_flags |= STA_DEMOTE11B; 1097184302Ssam } 1098184302Ssam } 1099184302Ssam } else if (rate < 2*24) { 1100184302Ssam /* 1101184302Ssam * This is an 11b-only ap. Check the desired mode in 1102184302Ssam * case that needs to be honored (mode 11g filters out 1103184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1104184302Ssam * in scanning to be demoted. 1105184302Ssam * 1106184302Ssam * NB: we cheat a bit here by looking at the max rate; 1107184302Ssam * we could/should check the rates. 1108184302Ssam */ 1109184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1110184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1111184302Ssam fail |= MATCH_RATE; 1112184302Ssam else 1113184302Ssam se0->se_flags |= STA_DEMOTE11B; 1114184302Ssam } 1115170530Ssam if (ss->ss_nssid != 0 && 1116171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1117171409Ssam fail |= MATCH_SSID; 1118178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1119178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1120178354Ssam fail |= MATCH_BSSID; 1121170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1122171409Ssam fail |= MATCH_FAILS; 1123170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1124171409Ssam fail |= MATCH_NOTSEEN; 1125170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1126171409Ssam fail |= MATCH_RSSI; 1127170530Ssam#ifdef IEEE80211_DEBUG 1128178354Ssam if (ieee80211_msg(vap, debug)) { 1129170530Ssam printf(" %c %s", 1130171409Ssam fail & MATCH_FAILS ? '=' : 1131171409Ssam fail & MATCH_NOTSEEN ? '^' : 1132178354Ssam fail & MATCH_CC ? '$' : 1133186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1134186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1135189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1136189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1137189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1138189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1139186904Ssam#endif 1140195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1141171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1142170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1143171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1144170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1145171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1146171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1147170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1148171409Ssam fail & MATCH_RATE ? '!' : ' '); 1149170530Ssam printf(" %4s%c", 1150170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1151189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1152171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1153170530Ssam printf(" %3s%c ", 1154170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1155170530Ssam "wep" : "no", 1156171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1157170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1158195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1159170530Ssam } 1160170530Ssam#endif 1161170530Ssam return fail; 1162170530Ssam} 1163170530Ssam 1164170530Ssamstatic void 1165170530Ssamsta_update_notseen(struct sta_table *st) 1166170530Ssam{ 1167170530Ssam struct sta_entry *se; 1168170530Ssam 1169206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1170170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1171170530Ssam /* 1172170530Ssam * If seen the reset and don't bump the count; 1173170530Ssam * otherwise bump the ``not seen'' count. Note 1174170530Ssam * that this insures that stations for which we 1175170530Ssam * see frames while not scanning but not during 1176170530Ssam * this scan will not be penalized. 1177170530Ssam */ 1178170530Ssam if (se->se_seen) 1179170530Ssam se->se_seen = 0; 1180170530Ssam else 1181170530Ssam se->se_notseen++; 1182170530Ssam } 1183206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1184170530Ssam} 1185170530Ssam 1186170530Ssamstatic void 1187170530Ssamsta_dec_fails(struct sta_table *st) 1188170530Ssam{ 1189170530Ssam struct sta_entry *se; 1190170530Ssam 1191206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1192170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1193170530Ssam if (se->se_fails) 1194170530Ssam se->se_fails--; 1195206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1196170530Ssam} 1197170530Ssam 1198170530Ssamstatic struct sta_entry * 1199178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1200170530Ssam{ 1201170530Ssam struct sta_table *st = ss->ss_priv; 1202170530Ssam struct sta_entry *se, *selbs = NULL; 1203170530Ssam 1204178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1205170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1206206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1207170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1208184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1209178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1210170530Ssam if (selbs == NULL) 1211170530Ssam selbs = se; 1212170530Ssam else if (sta_compare(se, selbs) > 0) 1213170530Ssam selbs = se; 1214170530Ssam } 1215170530Ssam } 1216206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1217170530Ssam 1218170530Ssam return selbs; 1219170530Ssam} 1220170530Ssam 1221170530Ssam/* 1222170530Ssam * Pick an ap or ibss network to join or find a channel 1223170530Ssam * to use to start an ibss network. 1224170530Ssam */ 1225170530Ssamstatic int 1226178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1227170530Ssam{ 1228170530Ssam struct sta_table *st = ss->ss_priv; 1229170530Ssam struct sta_entry *selbs; 1230184274Ssam struct ieee80211_channel *chan; 1231170530Ssam 1232178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1233178354Ssam ("wrong mode %u", vap->iv_opmode)); 1234170530Ssam 1235170530Ssam if (st->st_newscan) { 1236170530Ssam sta_update_notseen(st); 1237170530Ssam st->st_newscan = 0; 1238170530Ssam } 1239170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1240170530Ssam /* 1241170530Ssam * Manual/background scan, don't select+join the 1242170530Ssam * bss, just return. The scanning framework will 1243170530Ssam * handle notification that this has completed. 1244170530Ssam */ 1245170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1246170530Ssam return 1; 1247170530Ssam } 1248170530Ssam /* 1249170530Ssam * Automatic sequencing; look for a candidate and 1250170530Ssam * if found join the network. 1251170530Ssam */ 1252170530Ssam /* NB: unlocked read should be ok */ 1253170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1254178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1255170530Ssam "%s: no scan candidate\n", __func__); 1256178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1257178354Ssam return 0; 1258170530Ssamnotfound: 1259170530Ssam /* 1260170530Ssam * If nothing suitable was found decrement 1261170530Ssam * the failure counts so entries will be 1262170530Ssam * reconsidered the next time around. We 1263170530Ssam * really want to do this only for sta's 1264170530Ssam * where we've previously had some success. 1265170530Ssam */ 1266170530Ssam sta_dec_fails(st); 1267170530Ssam st->st_newscan = 1; 1268170530Ssam return 0; /* restart scan */ 1269170530Ssam } 1270178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1271178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1272178354Ssam return (selbs != NULL); 1273184274Ssam if (selbs == NULL) 1274170530Ssam goto notfound; 1275184274Ssam chan = selbs->base.se_chan; 1276184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1277184302Ssam chan = demote11b(vap, chan); 1278184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1279184274Ssam goto notfound; 1280170530Ssam return 1; /* terminate scan */ 1281170530Ssam} 1282170530Ssam 1283170530Ssam/* 1284170530Ssam * Lookup an entry in the scan cache. We assume we're 1285170530Ssam * called from the bottom half or such that we don't need 1286170530Ssam * to block the bottom half so that it's safe to return 1287170530Ssam * a reference to an entry w/o holding the lock on the table. 1288170530Ssam */ 1289170530Ssamstatic struct sta_entry * 1290170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1291170530Ssam{ 1292170530Ssam struct sta_entry *se; 1293170530Ssam int hash = STA_HASH(macaddr); 1294170530Ssam 1295206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1296170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1297170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1298170530Ssam break; 1299206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1300170530Ssam 1301170530Ssam return se; /* NB: unlocked */ 1302170530Ssam} 1303170530Ssam 1304170530Ssamstatic void 1305178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1306170530Ssam{ 1307178354Ssam struct ieee80211com *ic = vap->iv_ic; 1308178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1309170530Ssam struct sta_table *st = ss->ss_priv; 1310178354Ssam enum ieee80211_phymode mode; 1311170530Ssam struct sta_entry *se, *selbs; 1312178354Ssam uint8_t roamRate, curRate, ucastRate; 1313170530Ssam int8_t roamRssi, curRssi; 1314170530Ssam 1315170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1316170530Ssam if (se == NULL) { 1317170530Ssam /* XXX something is wrong */ 1318170530Ssam return; 1319170530Ssam } 1320170530Ssam 1321178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1322178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1323178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1324178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1325170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1326170530Ssam curRssi = ic->ic_node_getrssi(ni); 1327178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1328178354Ssam curRate = ni->ni_txrate; 1329178354Ssam roamRate &= IEEE80211_RATE_VAL; 1330178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1331170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1332170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1333170530Ssam } else { 1334170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1335178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1336170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1337170530Ssam } 1338170530Ssam /* 1339170530Ssam * Check if a new ap should be used and switch. 1340170530Ssam * XXX deauth current ap 1341170530Ssam */ 1342170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1343297405Sadrian if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1344170530Ssam /* 1345170530Ssam * Scan cache contents are too old; force a scan now 1346170530Ssam * if possible so we have current state to make a 1347170530Ssam * decision with. We don't kick off a bg scan if 1348170530Ssam * we're using dynamic turbo and boosted or if the 1349170530Ssam * channel is busy. 1350170530Ssam * XXX force immediate switch on scan complete 1351170530Ssam */ 1352170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1353297405Sadrian ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1354178354Ssam ieee80211_bg_scan(vap, 0); 1355170530Ssam return; 1356170530Ssam } 1357170530Ssam se->base.se_rssi = curRssi; 1358178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1359170530Ssam if (selbs != NULL && selbs != se) { 1360184274Ssam struct ieee80211_channel *chan; 1361184274Ssam 1362178354Ssam IEEE80211_DPRINTF(vap, 1363170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1364170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1365170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1366170530Ssam curRate, roamRate, curRssi, roamRssi); 1367184274Ssam 1368184274Ssam chan = selbs->base.se_chan; 1369184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1370184302Ssam chan = demote11b(vap, chan); 1371184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1372170530Ssam } 1373170530Ssam } 1374170530Ssam} 1375170530Ssam 1376170530Ssam/* 1377170530Ssam * Age entries in the scan cache. 1378170530Ssam * XXX also do roaming since it's convenient 1379170530Ssam */ 1380170530Ssamstatic void 1381170530Ssamsta_age(struct ieee80211_scan_state *ss) 1382170530Ssam{ 1383178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1384170530Ssam 1385178354Ssam adhoc_age(ss); 1386170530Ssam /* 1387170530Ssam * If rate control is enabled check periodically to see if 1388170530Ssam * we should roam from our current connection to one that 1389170530Ssam * might be better. This only applies when we're operating 1390170530Ssam * in sta mode and automatic roaming is set. 1391170530Ssam * XXX defer if busy 1392170530Ssam * XXX repeater station 1393170530Ssam * XXX do when !bgscan? 1394170530Ssam */ 1395178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1396178354Ssam ("wrong mode %u", vap->iv_opmode)); 1397178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1398213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1399178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1400170530Ssam /* XXX vap is implicit */ 1401178354Ssam sta_roam_check(ss, vap); 1402170530Ssam} 1403170530Ssam 1404170530Ssam/* 1405170530Ssam * Iterate over the entries in the scan cache, invoking 1406170530Ssam * the callback function on each one. 1407170530Ssam */ 1408170530Ssamstatic void 1409170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1410170530Ssam ieee80211_scan_iter_func *f, void *arg) 1411170530Ssam{ 1412170530Ssam struct sta_table *st = ss->ss_priv; 1413170530Ssam struct sta_entry *se; 1414170530Ssam u_int gen; 1415170530Ssam 1416283556Sadrian IEEE80211_SCAN_ITER_LOCK(st); 1417178354Ssam gen = st->st_scaniter++; 1418170530Ssamrestart: 1419206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1420170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1421170530Ssam if (se->se_scangen != gen) { 1422170530Ssam se->se_scangen = gen; 1423170530Ssam /* update public state */ 1424170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1425206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1426170530Ssam (*f)(arg, &se->base); 1427170530Ssam goto restart; 1428170530Ssam } 1429170530Ssam } 1430206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1431170530Ssam 1432283556Sadrian IEEE80211_SCAN_ITER_UNLOCK(st); 1433170530Ssam} 1434170530Ssam 1435170530Ssamstatic void 1436170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1437170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1438170530Ssam{ 1439170530Ssam struct sta_table *st = ss->ss_priv; 1440170530Ssam struct sta_entry *se; 1441170530Ssam 1442170530Ssam se = sta_lookup(st, macaddr); 1443170530Ssam if (se != NULL) { 1444170530Ssam se->se_fails++; 1445170530Ssam se->se_lastfail = ticks; 1446178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1447170530Ssam macaddr, "%s: reason %u fails %u", 1448170530Ssam __func__, reason, se->se_fails); 1449170530Ssam } 1450170530Ssam} 1451170530Ssam 1452170530Ssamstatic void 1453170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1454170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1455170530Ssam{ 1456170530Ssam struct sta_table *st = ss->ss_priv; 1457170530Ssam struct sta_entry *se; 1458170530Ssam 1459170530Ssam se = sta_lookup(st, macaddr); 1460170530Ssam if (se != NULL) { 1461170530Ssam#if 0 1462170530Ssam se->se_fails = 0; 1463178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1464170530Ssam macaddr, "%s: fails %u", 1465170530Ssam __func__, se->se_fails); 1466170530Ssam#endif 1467170530Ssam se->se_lastassoc = ticks; 1468170530Ssam } 1469170530Ssam} 1470170530Ssam 1471170530Ssamstatic const struct ieee80211_scanner sta_default = { 1472170530Ssam .scan_name = "default", 1473170530Ssam .scan_attach = sta_attach, 1474170530Ssam .scan_detach = sta_detach, 1475170530Ssam .scan_start = sta_start, 1476170530Ssam .scan_restart = sta_restart, 1477170530Ssam .scan_cancel = sta_cancel, 1478170530Ssam .scan_end = sta_pick_bss, 1479170530Ssam .scan_flush = sta_flush, 1480170530Ssam .scan_add = sta_add, 1481170530Ssam .scan_age = sta_age, 1482170530Ssam .scan_iterate = sta_iterate, 1483170530Ssam .scan_assoc_fail = sta_assoc_fail, 1484170530Ssam .scan_assoc_success = sta_assoc_success, 1485170530Ssam}; 1486195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1487170530Ssam 1488170530Ssam/* 1489170530Ssam * Adhoc mode-specific support. 1490170530Ssam */ 1491170530Ssam 1492170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1493170530Ssam{ 5180, 5200, 5220, 5240 }; 1494170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1495170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1496170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1497170530Ssam{ 5170, 5190, 5210, 5230 }; 1498170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1499170530Ssam{ 2457, 2462 }; 1500170530Ssam 1501170530Ssamstatic const struct scanlist adhocScanTable[] = { 1502170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1503170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1504170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1505170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1506170530Ssam { .list = NULL } 1507170530Ssam}; 1508170530Ssam#undef X 1509170530Ssam 1510170530Ssam/* 1511170530Ssam * Start an adhoc-mode scan by populating the channel list. 1512170530Ssam */ 1513170530Ssamstatic int 1514178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1515170530Ssam{ 1516170530Ssam struct sta_table *st = ss->ss_priv; 1517170530Ssam 1518178354Ssam makescanlist(ss, vap, adhocScanTable); 1519176653Ssam 1520178354Ssam if (ss->ss_mindwell == 0) 1521178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1522178354Ssam if (ss->ss_maxdwell == 0) 1523178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1524176653Ssam 1525178354Ssam st->st_scangen++; 1526170530Ssam st->st_newscan = 1; 1527170530Ssam 1528170530Ssam return 0; 1529170530Ssam} 1530170530Ssam 1531170530Ssam/* 1532170530Ssam * Select a channel to start an adhoc network on. 1533170530Ssam * The channel list was populated with appropriate 1534170530Ssam * channels so select one that looks least occupied. 1535170530Ssam */ 1536170530Ssamstatic struct ieee80211_channel * 1537178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1538170530Ssam{ 1539170530Ssam struct sta_table *st = ss->ss_priv; 1540170530Ssam struct sta_entry *se; 1541170530Ssam struct ieee80211_channel *c, *bestchan; 1542170530Ssam int i, bestrssi, maxrssi; 1543170530Ssam 1544170530Ssam bestchan = NULL; 1545170530Ssam bestrssi = -1; 1546170530Ssam 1547206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1548170530Ssam for (i = 0; i < ss->ss_last; i++) { 1549170530Ssam c = ss->ss_chans[i]; 1550178354Ssam /* never consider a channel with radar */ 1551178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1552176653Ssam continue; 1553178354Ssam /* skip channels disallowed by regulatory settings */ 1554178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1555178354Ssam continue; 1556178354Ssam /* check channel attributes for band compatibility */ 1557178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1558178354Ssam continue; 1559170530Ssam maxrssi = 0; 1560170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1561170530Ssam if (se->base.se_chan != c) 1562170530Ssam continue; 1563170530Ssam if (se->base.se_rssi > maxrssi) 1564170530Ssam maxrssi = se->base.se_rssi; 1565170530Ssam } 1566170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1567170530Ssam bestchan = c; 1568170530Ssam } 1569206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1570170530Ssam 1571170530Ssam return bestchan; 1572170530Ssam} 1573170530Ssam 1574170530Ssam/* 1575170530Ssam * Pick an ibss network to join or find a channel 1576170530Ssam * to use to start an ibss network. 1577170530Ssam */ 1578170530Ssamstatic int 1579178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1580170530Ssam{ 1581170530Ssam struct sta_table *st = ss->ss_priv; 1582170530Ssam struct sta_entry *selbs; 1583170530Ssam struct ieee80211_channel *chan; 1584245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1585170530Ssam 1586178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1587195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1588195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1589178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1590170530Ssam 1591170530Ssam if (st->st_newscan) { 1592170530Ssam sta_update_notseen(st); 1593170530Ssam st->st_newscan = 0; 1594170530Ssam } 1595170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1596170530Ssam /* 1597170530Ssam * Manual/background scan, don't select+join the 1598170530Ssam * bss, just return. The scanning framework will 1599170530Ssam * handle notification that this has completed. 1600170530Ssam */ 1601170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1602170530Ssam return 1; 1603170530Ssam } 1604170530Ssam /* 1605170530Ssam * Automatic sequencing; look for a candidate and 1606170530Ssam * if found join the network. 1607170530Ssam */ 1608170530Ssam /* NB: unlocked read should be ok */ 1609170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1610178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1611170530Ssam "%s: no scan candidate\n", __func__); 1612178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1613178354Ssam return 0; 1614170530Ssamnotfound: 1615186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1616186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1617186904Ssam if (vap->iv_des_nssid && 1618186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1619186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1620186904Ssam#else 1621178354Ssam if (vap->iv_des_nssid) { 1622186904Ssam#endif 1623170530Ssam /* 1624170530Ssam * No existing adhoc network to join and we have 1625170530Ssam * an ssid; start one up. If no channel was 1626170530Ssam * specified, try to select a channel. 1627170530Ssam */ 1628178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1629178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1630183421Ssam chan = adhoc_pick_channel(ss, 0); 1631178354Ssam } else 1632178354Ssam chan = vap->iv_des_chan; 1633170530Ssam if (chan != NULL) { 1634245928Sadrian /* 1635245928Sadrian * Create a HT capable IBSS; the per-node 1636245928Sadrian * probe request/response will result in 1637245928Sadrian * "correct" rate control capabilities being 1638245928Sadrian * negotiated. 1639245928Sadrian */ 1640245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1641245928Sadrian chan, vap->iv_flags_ht); 1642178354Ssam ieee80211_create_ibss(vap, chan); 1643170530Ssam return 1; 1644170530Ssam } 1645170530Ssam } 1646170530Ssam /* 1647170530Ssam * If nothing suitable was found decrement 1648170530Ssam * the failure counts so entries will be 1649170530Ssam * reconsidered the next time around. We 1650170530Ssam * really want to do this only for sta's 1651170530Ssam * where we've previously had some success. 1652170530Ssam */ 1653170530Ssam sta_dec_fails(st); 1654170530Ssam st->st_newscan = 1; 1655170530Ssam return 0; /* restart scan */ 1656170530Ssam } 1657178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1658178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1659178354Ssam return (selbs != NULL); 1660184274Ssam if (selbs == NULL) 1661170530Ssam goto notfound; 1662184274Ssam chan = selbs->base.se_chan; 1663184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1664184302Ssam chan = demote11b(vap, chan); 1665245928Sadrian /* 1666245928Sadrian * If HT is available, make it a possibility here. 1667245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1668245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1669245928Sadrian * to any subsequent nodes that support it. 1670245928Sadrian */ 1671245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1672245928Sadrian chan, vap->iv_flags_ht); 1673184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1674184274Ssam goto notfound; 1675170530Ssam return 1; /* terminate scan */ 1676170530Ssam} 1677170530Ssam 1678170530Ssam/* 1679170530Ssam * Age entries in the scan cache. 1680170530Ssam */ 1681170530Ssamstatic void 1682170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1683170530Ssam{ 1684170530Ssam struct sta_table *st = ss->ss_priv; 1685170530Ssam struct sta_entry *se, *next; 1686170530Ssam 1687206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1688170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1689170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1690170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1691170530Ssam LIST_REMOVE(se, se_hash); 1692178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1693283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 1694170530Ssam } 1695170530Ssam } 1696206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1697170530Ssam} 1698170530Ssam 1699170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1700170530Ssam .scan_name = "default", 1701170530Ssam .scan_attach = sta_attach, 1702170530Ssam .scan_detach = sta_detach, 1703170530Ssam .scan_start = adhoc_start, 1704170530Ssam .scan_restart = sta_restart, 1705170530Ssam .scan_cancel = sta_cancel, 1706170530Ssam .scan_end = adhoc_pick_bss, 1707170530Ssam .scan_flush = sta_flush, 1708178354Ssam .scan_pickchan = adhoc_pick_channel, 1709170530Ssam .scan_add = sta_add, 1710170530Ssam .scan_age = adhoc_age, 1711170530Ssam .scan_iterate = sta_iterate, 1712170530Ssam .scan_assoc_fail = sta_assoc_fail, 1713170530Ssam .scan_assoc_success = sta_assoc_success, 1714170530Ssam}; 1715195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1716195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1717170530Ssam 1718178354Ssamstatic int 1719178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1720178354Ssam{ 1721178354Ssam struct sta_table *st = ss->ss_priv; 1722178354Ssam 1723178354Ssam makescanlist(ss, vap, staScanTable); 1724178354Ssam 1725178354Ssam if (ss->ss_mindwell == 0) 1726178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1727178354Ssam if (ss->ss_maxdwell == 0) 1728178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1729178354Ssam 1730178354Ssam st->st_scangen++; 1731178354Ssam st->st_newscan = 1; 1732178354Ssam 1733178354Ssam return 0; 1734178354Ssam} 1735178354Ssam 1736170530Ssam/* 1737178354Ssam * Cancel an ongoing scan. 1738170530Ssam */ 1739170530Ssamstatic int 1740178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1741170530Ssam{ 1742178354Ssam return 0; 1743178354Ssam} 1744178354Ssam 1745178354Ssam/* 1746178354Ssam * Pick a quiet channel to use for ap operation. 1747178354Ssam */ 1748178354Ssamstatic struct ieee80211_channel * 1749178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1750178354Ssam{ 1751178354Ssam struct sta_table *st = ss->ss_priv; 1752178354Ssam struct ieee80211_channel *bestchan = NULL; 1753178354Ssam int i; 1754178354Ssam 1755178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1756178354Ssam /* NB: use scan list order to preserve channel preference */ 1757178354Ssam for (i = 0; i < ss->ss_last; i++) { 1758178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1759178354Ssam /* 1760178354Ssam * If the channel is unoccupied the max rssi 1761178354Ssam * should be zero; just take it. Otherwise 1762178354Ssam * track the channel with the lowest rssi and 1763178354Ssam * use that when all channels appear occupied. 1764178354Ssam */ 1765178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1766178354Ssam continue; 1767178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1768178354Ssam continue; 1769178354Ssam /* check channel attributes for band compatibility */ 1770178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1771178354Ssam continue; 1772186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1773178354Ssam /* XXX channel have interference */ 1774178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1775178354Ssam /* XXX use other considerations */ 1776178354Ssam return chan; 1777170530Ssam } 1778178354Ssam if (bestchan == NULL || 1779178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1780178354Ssam bestchan = chan; 1781178354Ssam } 1782178354Ssam return bestchan; 1783178354Ssam} 1784178354Ssam 1785178354Ssam/* 1786178354Ssam * Pick a quiet channel to use for ap operation. 1787178354Ssam */ 1788178354Ssamstatic int 1789178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1790178354Ssam{ 1791178354Ssam struct ieee80211com *ic = vap->iv_ic; 1792178354Ssam struct ieee80211_channel *bestchan; 1793178354Ssam 1794178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1795178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1796178354Ssam bestchan = ap_pick_channel(ss, 0); 1797178354Ssam if (bestchan == NULL) { 1798178354Ssam /* no suitable channel, should not happen */ 1799178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1800178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1801178354Ssam /* XXX print something? */ 1802178354Ssam return 0; /* restart scan */ 1803178354Ssam } 1804178354Ssam /* 1805178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1806178354Ssam */ 1807178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1808178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1809178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1810178354Ssam if (bestchan == NULL) { 1811178354Ssam /* should never happen ?? */ 1812178354Ssam return 0; 1813170530Ssam } 1814170530Ssam } 1815178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1816178354Ssam /* 1817178354Ssam * Manual/background scan, don't select+join the 1818178354Ssam * bss, just return. The scanning framework will 1819178354Ssam * handle notification that this has completed. 1820178354Ssam */ 1821178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1822178354Ssam return 1; 1823178354Ssam } 1824178354Ssam ieee80211_create_ibss(vap, 1825193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1826178354Ssam return 1; 1827170530Ssam} 1828170530Ssam 1829178354Ssamstatic const struct ieee80211_scanner ap_default = { 1830178354Ssam .scan_name = "default", 1831178354Ssam .scan_attach = sta_attach, 1832178354Ssam .scan_detach = sta_detach, 1833178354Ssam .scan_start = ap_start, 1834178354Ssam .scan_restart = sta_restart, 1835178354Ssam .scan_cancel = ap_cancel, 1836178354Ssam .scan_end = ap_end, 1837178354Ssam .scan_flush = sta_flush, 1838178354Ssam .scan_pickchan = ap_pick_channel, 1839178354Ssam .scan_add = sta_add, 1840178354Ssam .scan_age = adhoc_age, 1841178354Ssam .scan_iterate = sta_iterate, 1842178354Ssam .scan_assoc_success = sta_assoc_success, 1843178354Ssam .scan_assoc_fail = sta_assoc_fail, 1844170530Ssam}; 1845195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1846178354Ssam 1847195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1848178354Ssam/* 1849195618Srpaulo * Pick an mbss network to join or find a channel 1850195618Srpaulo * to use to start an mbss network. 1851178354Ssam */ 1852195618Srpaulostatic int 1853195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1854195618Srpaulo{ 1855195618Srpaulo struct sta_table *st = ss->ss_priv; 1856195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1857195618Srpaulo struct sta_entry *selbs; 1858195618Srpaulo struct ieee80211_channel *chan; 1859195618Srpaulo 1860195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1861195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1862195618Srpaulo 1863195618Srpaulo if (st->st_newscan) { 1864195618Srpaulo sta_update_notseen(st); 1865195618Srpaulo st->st_newscan = 0; 1866195618Srpaulo } 1867195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1868195618Srpaulo /* 1869195618Srpaulo * Manual/background scan, don't select+join the 1870195618Srpaulo * bss, just return. The scanning framework will 1871195618Srpaulo * handle notification that this has completed. 1872195618Srpaulo */ 1873195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1874195618Srpaulo return 1; 1875195618Srpaulo } 1876195618Srpaulo /* 1877195618Srpaulo * Automatic sequencing; look for a candidate and 1878195618Srpaulo * if found join the network. 1879195618Srpaulo */ 1880195618Srpaulo /* NB: unlocked read should be ok */ 1881195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1882195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1883195618Srpaulo "%s: no scan candidate\n", __func__); 1884195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1885195618Srpaulo return 0; 1886195618Srpaulonotfound: 1887195618Srpaulo if (ms->ms_idlen != 0) { 1888195618Srpaulo /* 1889195618Srpaulo * No existing mbss network to join and we have 1890195618Srpaulo * a meshid; start one up. If no channel was 1891195618Srpaulo * specified, try to select a channel. 1892195618Srpaulo */ 1893195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1894195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1895195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1896195618Srpaulo 1897195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1898195618Srpaulo if (chan != NULL) 1899195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1900195618Srpaulo chan, vap->iv_flags_ht); 1901195618Srpaulo } else 1902195618Srpaulo chan = vap->iv_des_chan; 1903195618Srpaulo if (chan != NULL) { 1904195618Srpaulo ieee80211_create_ibss(vap, chan); 1905195618Srpaulo return 1; 1906195618Srpaulo } 1907195618Srpaulo } 1908195618Srpaulo /* 1909195618Srpaulo * If nothing suitable was found decrement 1910195618Srpaulo * the failure counts so entries will be 1911195618Srpaulo * reconsidered the next time around. We 1912195618Srpaulo * really want to do this only for sta's 1913195618Srpaulo * where we've previously had some success. 1914195618Srpaulo */ 1915195618Srpaulo sta_dec_fails(st); 1916195618Srpaulo st->st_newscan = 1; 1917195618Srpaulo return 0; /* restart scan */ 1918195618Srpaulo } 1919195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1920195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1921195618Srpaulo return (selbs != NULL); 1922195618Srpaulo if (selbs == NULL) 1923195618Srpaulo goto notfound; 1924195618Srpaulo chan = selbs->base.se_chan; 1925195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1926195618Srpaulo chan = demote11b(vap, chan); 1927195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1928195618Srpaulo goto notfound; 1929195618Srpaulo return 1; /* terminate scan */ 1930195618Srpaulo} 1931195618Srpaulo 1932195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1933195618Srpaulo .scan_name = "default", 1934195618Srpaulo .scan_attach = sta_attach, 1935195618Srpaulo .scan_detach = sta_detach, 1936195618Srpaulo .scan_start = adhoc_start, 1937195618Srpaulo .scan_restart = sta_restart, 1938195618Srpaulo .scan_cancel = sta_cancel, 1939195618Srpaulo .scan_end = mesh_pick_bss, 1940195618Srpaulo .scan_flush = sta_flush, 1941195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1942195618Srpaulo .scan_add = sta_add, 1943195618Srpaulo .scan_age = adhoc_age, 1944195618Srpaulo .scan_iterate = sta_iterate, 1945195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1946195618Srpaulo .scan_assoc_success = sta_assoc_success, 1947195618Srpaulo}; 1948195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1949195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1950