ieee80211_scan_sta.c revision 283556
1170530Ssam/*- 2186904Ssam * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3170530Ssam * All rights reserved. 4170530Ssam * 5170530Ssam * Redistribution and use in source and binary forms, with or without 6170530Ssam * modification, are permitted provided that the following conditions 7170530Ssam * are met: 8170530Ssam * 1. Redistributions of source code must retain the above copyright 9170530Ssam * notice, this list of conditions and the following disclaimer. 10170530Ssam * 2. Redistributions in binary form must reproduce the above copyright 11170530Ssam * notice, this list of conditions and the following disclaimer in the 12170530Ssam * documentation and/or other materials provided with the distribution. 13170530Ssam * 14170530Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15170530Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16170530Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17170530Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18170530Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19170530Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20170530Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21170530Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22170530Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23170530Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24170530Ssam */ 25170530Ssam 26170530Ssam#include <sys/cdefs.h> 27170530Ssam__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_scan_sta.c 283556 2015-05-26 04:37:59Z adrian $"); 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> 37170530Ssam#include <sys/module.h> 38191746Sthompsa 39170530Ssam#include <sys/socket.h> 40170530Ssam 41170530Ssam#include <net/if.h> 42257176Sglebius#include <net/if_var.h> 43170530Ssam#include <net/if_media.h> 44170530Ssam#include <net/ethernet.h> 45170530Ssam 46170530Ssam#include <net80211/ieee80211_var.h> 47178354Ssam#include <net80211/ieee80211_input.h> 48178354Ssam#include <net80211/ieee80211_regdomain.h> 49186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 50186904Ssam#include <net80211/ieee80211_tdma.h> 51186904Ssam#endif 52195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 53195618Srpaulo#include <net80211/ieee80211_mesh.h> 54195618Srpaulo#endif 55245928Sadrian#include <net80211/ieee80211_ratectl.h> 56170530Ssam 57170530Ssam#include <net/bpf.h> 58170530Ssam 59170530Ssam/* 60170530Ssam * Parameters for managing cache entries: 61170530Ssam * 62170530Ssam * o a station with STA_FAILS_MAX failures is not considered 63170530Ssam * when picking a candidate 64170530Ssam * o a station that hasn't had an update in STA_PURGE_SCANS 65170530Ssam * (background) scans is discarded 66170530Ssam * o after STA_FAILS_AGE seconds we clear the failure count 67170530Ssam */ 68170530Ssam#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 69170530Ssam#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 70170530Ssam#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 71170530Ssam 72170530Ssam/* XXX tunable */ 73170530Ssam#define STA_RSSI_MIN 8 /* min acceptable rssi */ 74170530Ssam#define STA_RSSI_MAX 40 /* max rssi for comparison */ 75170530Ssam 76170530Ssamstruct sta_entry { 77170530Ssam struct ieee80211_scan_entry base; 78170530Ssam TAILQ_ENTRY(sta_entry) se_list; 79170530Ssam LIST_ENTRY(sta_entry) se_hash; 80170530Ssam uint8_t se_fails; /* failure to associate count */ 81170530Ssam uint8_t se_seen; /* seen during current scan */ 82170530Ssam uint8_t se_notseen; /* not seen in previous scans */ 83170530Ssam uint8_t se_flags; 84184302Ssam#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 85170530Ssam uint32_t se_avgrssi; /* LPF rssi state */ 86170530Ssam unsigned long se_lastupdate; /* time of last update */ 87170530Ssam unsigned long se_lastfail; /* time of last failure */ 88170530Ssam unsigned long se_lastassoc; /* time of last association */ 89170530Ssam u_int se_scangen; /* iterator scan gen# */ 90178354Ssam u_int se_countrygen; /* gen# of last cc notify */ 91170530Ssam}; 92170530Ssam 93170530Ssam#define STA_HASHSIZE 32 94170530Ssam/* simple hash is enough for variation of macaddr */ 95170530Ssam#define STA_HASH(addr) \ 96170530Ssam (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 97170530Ssam 98186107Ssam#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 99186107SsamCTASSERT(MAX_IEEE_CHAN >= 256); 100186107Ssam 101170530Ssamstruct sta_table { 102206617Srpaulo ieee80211_scan_table_lock_t st_lock; /* on scan table */ 103170530Ssam TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 104170530Ssam LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 105283556Sadrian ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */ 106178354Ssam u_int st_scaniter; /* gen# for iterator */ 107178354Ssam u_int st_scangen; /* scan generation # */ 108170530Ssam int st_newscan; 109178354Ssam /* ap-related state */ 110186107Ssam int st_maxrssi[MAX_IEEE_CHAN]; 111170530Ssam}; 112170530Ssam 113170530Ssamstatic void sta_flush_table(struct sta_table *); 114171409Ssam/* 115171409Ssam * match_bss returns a bitmask describing if an entry is suitable 116171409Ssam * for use. If non-zero the entry was deemed not suitable and it's 117171409Ssam * contents explains why. The following flags are or'd to to this 118171409Ssam * mask and can be used to figure out why the entry was rejected. 119171409Ssam */ 120195618Srpaulo#define MATCH_CHANNEL 0x00001 /* channel mismatch */ 121195618Srpaulo#define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 122195618Srpaulo#define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 123195618Srpaulo#define MATCH_RATE 0x00008 /* rate set mismatch */ 124195618Srpaulo#define MATCH_SSID 0x00010 /* ssid mismatch */ 125195618Srpaulo#define MATCH_BSSID 0x00020 /* bssid mismatch */ 126195618Srpaulo#define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 127195618Srpaulo#define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 128195618Srpaulo#define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 129195618Srpaulo#define MATCH_CC 0x00200 /* country code mismatch */ 130195618Srpaulo#define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 131195618Srpaulo#define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 132195618Srpaulo#define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 133195618Srpaulo#define MATCH_TDMA_LOCAL 0x02000 /* local address */ 134195618Srpaulo#define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 135195618Srpaulo#define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 136195618Srpaulo#define MATCH_MESHID 0x20000 /* meshid mismatch */ 137178354Ssamstatic int match_bss(struct ieee80211vap *, 138170530Ssam const struct ieee80211_scan_state *, struct sta_entry *, int); 139178354Ssamstatic void adhoc_age(struct ieee80211_scan_state *); 140170530Ssam 141178354Ssamstatic __inline int 142178354Ssamisocmp(const uint8_t cc1[], const uint8_t cc2[]) 143178354Ssam{ 144178354Ssam return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 145178354Ssam} 146178354Ssam 147170530Ssam/* number of references from net80211 layer */ 148170530Ssamstatic int nrefs = 0; 149195618Srpaulo/* 150195618Srpaulo * Module glue. 151195618Srpaulo */ 152195618SrpauloIEEE80211_SCANNER_MODULE(sta, 1); 153170530Ssam 154170530Ssam/* 155170530Ssam * Attach prior to any scanning work. 156170530Ssam */ 157170530Ssamstatic int 158170530Ssamsta_attach(struct ieee80211_scan_state *ss) 159170530Ssam{ 160170530Ssam struct sta_table *st; 161170530Ssam 162283538Sadrian st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table), 163283538Sadrian M_80211_SCAN, 164283538Sadrian IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 165170530Ssam if (st == NULL) 166170530Ssam return 0; 167206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 168283556Sadrian IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen"); 169170530Ssam TAILQ_INIT(&st->st_entry); 170170530Ssam ss->ss_priv = st; 171170530Ssam nrefs++; /* NB: we assume caller locking */ 172170530Ssam return 1; 173170530Ssam} 174170530Ssam 175170530Ssam/* 176170530Ssam * Cleanup any private state. 177170530Ssam */ 178170530Ssamstatic int 179170530Ssamsta_detach(struct ieee80211_scan_state *ss) 180170530Ssam{ 181170530Ssam struct sta_table *st = ss->ss_priv; 182170530Ssam 183170530Ssam if (st != NULL) { 184170530Ssam sta_flush_table(st); 185206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 186283556Sadrian IEEE80211_SCAN_ITER_LOCK_DESTROY(st); 187283538Sadrian IEEE80211_FREE(st, M_80211_SCAN); 188170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 189170530Ssam nrefs--; /* NB: we assume caller locking */ 190170530Ssam } 191170530Ssam return 1; 192170530Ssam} 193170530Ssam 194170530Ssam/* 195170530Ssam * Flush all per-scan state. 196170530Ssam */ 197170530Ssamstatic int 198170530Ssamsta_flush(struct ieee80211_scan_state *ss) 199170530Ssam{ 200170530Ssam struct sta_table *st = ss->ss_priv; 201170530Ssam 202206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 203170530Ssam sta_flush_table(st); 204206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 205170530Ssam ss->ss_last = 0; 206170530Ssam return 0; 207170530Ssam} 208170530Ssam 209170530Ssam/* 210170530Ssam * Flush all entries in the scan cache. 211170530Ssam */ 212170530Ssamstatic void 213170530Ssamsta_flush_table(struct sta_table *st) 214170530Ssam{ 215170530Ssam struct sta_entry *se, *next; 216170530Ssam 217170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 218170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 219170530Ssam LIST_REMOVE(se, se_hash); 220178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 221283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 222170530Ssam } 223178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 224170530Ssam} 225170530Ssam 226170530Ssam/* 227170530Ssam * Process a beacon or probe response frame; create an 228170530Ssam * entry in the scan cache or update any previous entry. 229170530Ssam */ 230170530Ssamstatic int 231170530Ssamsta_add(struct ieee80211_scan_state *ss, 232282742Sadrian struct ieee80211_channel *curchan, 233170530Ssam const struct ieee80211_scanparams *sp, 234170530Ssam const struct ieee80211_frame *wh, 235192468Ssam int subtype, int rssi, int noise) 236170530Ssam{ 237170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 238170530Ssam#define PICK1ST(_ss) \ 239170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 240170530Ssam IEEE80211_SCAN_PICK1ST) 241170530Ssam struct sta_table *st = ss->ss_priv; 242170530Ssam const uint8_t *macaddr = wh->i_addr2; 243178354Ssam struct ieee80211vap *vap = ss->ss_vap; 244178354Ssam struct ieee80211com *ic = vap->iv_ic; 245224717Sbschmidt struct ieee80211_channel *c; 246170530Ssam struct sta_entry *se; 247170530Ssam struct ieee80211_scan_entry *ise; 248178354Ssam int hash; 249170530Ssam 250170530Ssam hash = STA_HASH(macaddr); 251170530Ssam 252206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 253170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 254170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 255170530Ssam goto found; 256283538Sadrian se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry), 257283538Sadrian M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 258170530Ssam if (se == NULL) { 259206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 260170530Ssam return 0; 261170530Ssam } 262178354Ssam se->se_scangen = st->st_scaniter-1; 263178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 264170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 265170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 266170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 267170530Ssamfound: 268170530Ssam ise = &se->base; 269170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 270170530Ssam if (sp->ssid[1] != 0 && 271170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 272170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 273170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 274170530Ssam ("rate set too large: %u", sp->rates[1])); 275170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 276170530Ssam if (sp->xrates != NULL) { 277170530Ssam /* XXX validate xrates[1] */ 278178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 279170530Ssam ("xrate set too large: %u", sp->xrates[1])); 280170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 281170530Ssam } else 282170530Ssam ise->se_xrates[1] = 0; 283170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 284178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 285173368Ssam /* 286173368Ssam * Record rssi data using extended precision LPF filter. 287173368Ssam * 288173368Ssam * NB: use only on-channel data to insure we get a good 289173368Ssam * estimate of the signal we'll see when associated. 290173368Ssam */ 291178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 292178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 293173368Ssam ise->se_noise = noise; 294173368Ssam } 295170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 296170530Ssam ise->se_intval = sp->bintval; 297170530Ssam ise->se_capinfo = sp->capinfo; 298195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 299195618Srpaulo if (sp->meshid != NULL && sp->meshid[1] != 0) 300195618Srpaulo memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 301195618Srpaulo#endif 302173368Ssam /* 303173368Ssam * Beware of overriding se_chan for frames seen 304173368Ssam * off-channel; this can cause us to attempt an 305178354Ssam * association on the wrong channel. 306173368Ssam */ 307178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 308173368Ssam /* 309173862Ssam * Off-channel, locate the home/bss channel for the sta 310178354Ssam * using the value broadcast in the DSPARMS ie. We know 311178354Ssam * sp->chan has this value because it's used to calculate 312178354Ssam * IEEE80211_BPARSE_OFFCHAN. 313173368Ssam */ 314178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 315282742Sadrian curchan->ic_flags); 316173956Ssam if (c != NULL) { 317173956Ssam ise->se_chan = c; 318173956Ssam } else if (ise->se_chan == NULL) { 319173862Ssam /* should not happen, pick something */ 320282742Sadrian ise->se_chan = curchan; 321173862Ssam } 322173862Ssam } else 323282742Sadrian ise->se_chan = curchan; 324224717Sbschmidt if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 325224717Sbschmidt /* Demote legacy networks to a non-HT channel. */ 326224717Sbschmidt c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 327224717Sbschmidt ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 328224717Sbschmidt KASSERT(c != NULL, 329224717Sbschmidt ("no legacy channel %u", ise->se_chan->ic_ieee)); 330224717Sbschmidt ise->se_chan = c; 331224717Sbschmidt } 332170530Ssam ise->se_fhdwell = sp->fhdwell; 333170530Ssam ise->se_fhindex = sp->fhindex; 334170530Ssam ise->se_erp = sp->erp; 335170530Ssam ise->se_timoff = sp->timoff; 336170530Ssam if (sp->tim != NULL) { 337170530Ssam const struct ieee80211_tim_ie *tim = 338170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 339170530Ssam ise->se_dtimperiod = tim->tim_period; 340170530Ssam } 341178354Ssam if (sp->country != NULL) { 342178354Ssam const struct ieee80211_country_ie *cie = 343178354Ssam (const struct ieee80211_country_ie *) sp->country; 344178354Ssam /* 345178354Ssam * If 11d is enabled and we're attempting to join a bss 346178354Ssam * that advertises it's country code then compare our 347178354Ssam * current settings to what we fetched from the country ie. 348178354Ssam * If our country code is unspecified or different then 349178354Ssam * dispatch an event to user space that identifies the 350178354Ssam * country code so our regdomain config can be changed. 351178354Ssam */ 352178354Ssam /* XXX only for STA mode? */ 353178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 354178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 355178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 356178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 357178354Ssam /* only issue one notify event per scan */ 358178354Ssam if (se->se_countrygen != st->st_scangen) { 359178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 360178354Ssam cie->cc); 361178354Ssam se->se_countrygen = st->st_scangen; 362178354Ssam } 363178354Ssam } 364178354Ssam ise->se_cc[0] = cie->cc[0]; 365178354Ssam ise->se_cc[1] = cie->cc[1]; 366178354Ssam } 367178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 368178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 369170530Ssam 370170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 371170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 372170530Ssam se->se_fails = 0; 373178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 374170530Ssam "%s: fails %u", __func__, se->se_fails); 375170530Ssam } 376170530Ssam 377170530Ssam se->se_lastupdate = ticks; /* update time */ 378170530Ssam se->se_seen = 1; 379170530Ssam se->se_notseen = 0; 380170530Ssam 381186107Ssam KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 382178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 383178354Ssam st->st_maxrssi[sp->bchan] = rssi; 384178354Ssam 385206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 386170530Ssam 387170530Ssam /* 388170530Ssam * If looking for a quick choice and nothing's 389170530Ssam * been found check here. 390170530Ssam */ 391178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 392170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 393170530Ssam 394170530Ssam return 1; 395170530Ssam#undef PICK1ST 396170530Ssam#undef ISPROBE 397170530Ssam} 398170530Ssam 399170530Ssam/* 400170530Ssam * Check if a channel is excluded by user request. 401170530Ssam */ 402170530Ssamstatic int 403178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 404170530Ssam{ 405178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 406178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 407178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 408170530Ssam} 409170530Ssam 410170530Ssamstatic struct ieee80211_channel * 411170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 412170530Ssam{ 413170530Ssam struct ieee80211_channel *c; 414170530Ssam int j; 415170530Ssam 416170530Ssam /* 417170530Ssam * The normal ordering in the channel list is b channel 418170530Ssam * immediately followed by g so optimize the search for 419170530Ssam * this. We'll still do a full search just in case. 420170530Ssam */ 421170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 422170530Ssam c = &ic->ic_channels[j]; 423187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 424170530Ssam return c; 425170530Ssam } 426170530Ssam for (j = 0; j < i; j++) { 427170530Ssam c = &ic->ic_channels[j]; 428187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 429170530Ssam return c; 430170530Ssam } 431170530Ssam return NULL; 432170530Ssam} 433188777Ssam 434170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 435188777Ssam [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 436188777Ssam [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 437188777Ssam [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 438188777Ssam [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 439188777Ssam [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 440188777Ssam /* check base channel */ 441188777Ssam [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 442188777Ssam [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 443188777Ssam [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 444188782Ssam [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 445188782Ssam [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 446188777Ssam /* check legacy */ 447188777Ssam [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 448188777Ssam [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 449170530Ssam}; 450170530Ssam 451170530Ssamstatic void 452178354Ssamadd_channels(struct ieee80211vap *vap, 453170530Ssam struct ieee80211_scan_state *ss, 454170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 455170530Ssam{ 456178354Ssam struct ieee80211com *ic = vap->iv_ic; 457170530Ssam struct ieee80211_channel *c, *cg; 458170530Ssam u_int modeflags; 459170530Ssam int i; 460170530Ssam 461254315Srpaulo KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 462170530Ssam modeflags = chanflags[mode]; 463170530Ssam for (i = 0; i < nfreq; i++) { 464170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 465170530Ssam break; 466170530Ssam 467170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 468178354Ssam if (c == NULL || isexcluded(vap, c)) 469170530Ssam continue; 470170530Ssam if (mode == IEEE80211_MODE_AUTO) { 471170530Ssam /* 472170530Ssam * XXX special-case 11b/g channels so we select 473178354Ssam * the g channel if both are present. 474170530Ssam */ 475178354Ssam if (IEEE80211_IS_CHAN_B(c) && 476178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 477178354Ssam c = cg; 478170530Ssam } 479170530Ssam ss->ss_chans[ss->ss_last++] = c; 480170530Ssam } 481170530Ssam} 482170530Ssam 483170530Ssamstruct scanlist { 484170530Ssam uint16_t mode; 485170530Ssam uint16_t count; 486170530Ssam const uint16_t *list; 487170530Ssam}; 488170530Ssam 489170530Ssamstatic int 490170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 491170530Ssam{ 492170530Ssam int i; 493170530Ssam 494170530Ssam for (; scan->list != NULL; scan++) { 495170530Ssam for (i = 0; i < scan->count; i++) 496170530Ssam if (scan->list[i] == c->ic_freq) 497170530Ssam return 1; 498170530Ssam } 499170530Ssam return 0; 500170530Ssam} 501170530Ssam 502189377Ssamstatic int 503189377Ssamonscanlist(const struct ieee80211_scan_state *ss, 504189377Ssam const struct ieee80211_channel *c) 505189377Ssam{ 506189377Ssam int i; 507189377Ssam 508189377Ssam for (i = 0; i < ss->ss_last; i++) 509189377Ssam if (ss->ss_chans[i] == c) 510189377Ssam return 1; 511189377Ssam return 0; 512189377Ssam} 513189377Ssam 514176653Ssamstatic void 515178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 516176653Ssam const struct scanlist table[]) 517176653Ssam{ 518178354Ssam struct ieee80211com *ic = vap->iv_ic; 519176653Ssam struct ieee80211_channel *c; 520176653Ssam int i; 521176653Ssam 522176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 523176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 524176653Ssam break; 525176653Ssam 526176653Ssam c = &ic->ic_channels[i]; 527176653Ssam /* 528176653Ssam * Ignore dynamic turbo channels; we scan them 529176653Ssam * in normal mode (i.e. not boosted). Likewise 530176653Ssam * for HT channels, they get scanned using 531176653Ssam * legacy rates. 532176653Ssam */ 533176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 534176653Ssam continue; 535176653Ssam 536176653Ssam /* 537176653Ssam * If a desired mode was specified, scan only 538176653Ssam * channels that satisfy that constraint. 539176653Ssam */ 540178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 541178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 542176653Ssam continue; 543176653Ssam 544176653Ssam /* 545176653Ssam * Skip channels excluded by user request. 546176653Ssam */ 547178354Ssam if (isexcluded(vap, c)) 548176653Ssam continue; 549176653Ssam 550176653Ssam /* 551176653Ssam * Add the channel unless it is listed in the 552176653Ssam * fixed scan order tables. This insures we 553176653Ssam * don't sweep back in channels we filtered out 554176653Ssam * above. 555176653Ssam */ 556176653Ssam if (checktable(table, c)) 557176653Ssam continue; 558176653Ssam 559176653Ssam /* Add channel to scanning list. */ 560176653Ssam ss->ss_chans[ss->ss_last++] = c; 561176653Ssam } 562189377Ssam /* 563189377Ssam * Explicitly add any desired channel if: 564189377Ssam * - not already on the scan list 565189377Ssam * - allowed by any desired mode constraint 566189377Ssam * - there is space in the scan list 567189377Ssam * This allows the channel to be used when the filtering 568189377Ssam * mechanisms would otherwise elide it (e.g HT, turbo). 569189377Ssam */ 570189377Ssam c = vap->iv_des_chan; 571189377Ssam if (c != IEEE80211_CHAN_ANYC && 572189377Ssam !onscanlist(ss, c) && 573189377Ssam (vap->iv_des_mode == IEEE80211_MODE_AUTO || 574189377Ssam vap->iv_des_mode == ieee80211_chan2mode(c)) && 575189377Ssam ss->ss_last < IEEE80211_SCAN_MAX) 576189377Ssam ss->ss_chans[ss->ss_last++] = c; 577176653Ssam} 578176653Ssam 579178354Ssamstatic void 580178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 581178354Ssam const struct scanlist table[]) 582170530Ssam{ 583170530Ssam const struct scanlist *scan; 584170530Ssam enum ieee80211_phymode mode; 585170530Ssam 586170530Ssam ss->ss_last = 0; 587170530Ssam /* 588170530Ssam * Use the table of ordered channels to construct the list 589170530Ssam * of channels for scanning. Any channels in the ordered 590170530Ssam * list not in the master list will be discarded. 591170530Ssam */ 592178354Ssam for (scan = table; scan->list != NULL; scan++) { 593170530Ssam mode = scan->mode; 594178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 595170530Ssam /* 596170530Ssam * If a desired mode was specified, scan only 597170530Ssam * channels that satisfy that constraint. 598170530Ssam */ 599178354Ssam if (vap->iv_des_mode != mode) { 600170530Ssam /* 601170530Ssam * The scan table marks 2.4Ghz channels as b 602170530Ssam * so if the desired mode is 11g, then use 603170530Ssam * the 11b channel list but upgrade the mode. 604170530Ssam */ 605275875Sadrian if (vap->iv_des_mode == IEEE80211_MODE_11G) { 606275875Sadrian if (mode == IEEE80211_MODE_11G) /* Skip the G check */ 607275875Sadrian continue; 608275875Sadrian else if (mode == IEEE80211_MODE_11B) 609275875Sadrian mode = IEEE80211_MODE_11G; /* upgrade */ 610275875Sadrian } 611170530Ssam } 612170530Ssam } else { 613170530Ssam /* 614170530Ssam * This lets add_channels upgrade an 11b channel 615170530Ssam * to 11g if available. 616170530Ssam */ 617170530Ssam if (mode == IEEE80211_MODE_11B) 618170530Ssam mode = IEEE80211_MODE_AUTO; 619170530Ssam } 620170530Ssam#ifdef IEEE80211_F_XR 621170530Ssam /* XR does not operate on turbo channels */ 622178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 623170530Ssam (mode == IEEE80211_MODE_TURBO_A || 624170530Ssam mode == IEEE80211_MODE_TURBO_G || 625170530Ssam mode == IEEE80211_MODE_STURBO_A)) 626170530Ssam continue; 627170530Ssam#endif 628170530Ssam /* 629170530Ssam * Add the list of the channels; any that are not 630170530Ssam * in the master channel list will be discarded. 631170530Ssam */ 632178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 633170530Ssam } 634170530Ssam 635170530Ssam /* 636178354Ssam * Add the channels from the ic that are not present 637178354Ssam * in the table. 638170530Ssam */ 639178354Ssam sweepchannels(ss, vap, table); 640178354Ssam} 641170530Ssam 642178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 643178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 644178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 645178354Ssam{ 5170, 5190, 5210, 5230 }; 646178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 647178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 648178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 649178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 650178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 651178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 652178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 653178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 654178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 655178354Ssam{ 2484 }; 656178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 657178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 658178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 659178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 660178354Ssam#ifdef ATH_TURBO_SCAN 661178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 662178354Ssam{ 5210, 5250, 5290 }; 663178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 664178354Ssam{ 5760, 5800 }; 665178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 666178354Ssam{ 5540, 5580, 5620, 5660 }; 667178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 668178354Ssam{ 2437 }; 669178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 670178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 671178354Ssam#endif /* ATH_TURBO_SCAN */ 672170530Ssam 673178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 674170530Ssam 675178354Ssamstatic const struct scanlist staScanTable[] = { 676178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 677178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 678178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 679178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 680178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 681178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 682178354Ssam#ifdef ATH_TURBO_SCAN 683178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 684178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 685178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 686178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 687178354Ssam#endif /* ATH_TURBO_SCAN */ 688178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 689178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 690178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 691178354Ssam#ifdef ATH_TURBO_SCAN 692178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 693178354Ssam#endif /* ATH_TURBO_SCAN */ 694178354Ssam { .list = NULL } 695178354Ssam}; 696178354Ssam 697178354Ssam/* 698178354Ssam * Start a station-mode scan by populating the channel list. 699178354Ssam */ 700178354Ssamstatic int 701178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 702178354Ssam{ 703178354Ssam struct sta_table *st = ss->ss_priv; 704178354Ssam 705178354Ssam makescanlist(ss, vap, staScanTable); 706178354Ssam 707178354Ssam if (ss->ss_mindwell == 0) 708178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 709178354Ssam if (ss->ss_maxdwell == 0) 710178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 711178354Ssam 712178354Ssam st->st_scangen++; 713170530Ssam st->st_newscan = 1; 714170530Ssam 715170530Ssam return 0; 716170530Ssam} 717170530Ssam 718170530Ssam/* 719178354Ssam * Restart a scan, typically a bg scan but can 720178354Ssam * also be a fg scan that came up empty. 721170530Ssam */ 722170530Ssamstatic int 723178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 724170530Ssam{ 725170530Ssam struct sta_table *st = ss->ss_priv; 726170530Ssam 727170530Ssam st->st_newscan = 1; 728170530Ssam return 0; 729170530Ssam} 730170530Ssam 731170530Ssam/* 732170530Ssam * Cancel an ongoing scan. 733170530Ssam */ 734170530Ssamstatic int 735178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 736170530Ssam{ 737170530Ssam return 0; 738170530Ssam} 739170530Ssam 740258736Srpaulo/* unaligned little endian access */ 741178354Ssam#define LE_READ_2(p) \ 742178354Ssam ((uint16_t) \ 743178354Ssam ((((const uint8_t *)(p))[0] ) | \ 744178354Ssam (((const uint8_t *)(p))[1] << 8))) 745184302Ssam 746184302Ssam/* 747184302Ssam * Demote any supplied 11g channel to 11b. There should 748184302Ssam * always be an 11b channel but we check anyway... 749184302Ssam */ 750184302Ssamstatic struct ieee80211_channel * 751184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 752184302Ssam{ 753184302Ssam struct ieee80211_channel *c; 754178354Ssam 755184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 756184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 757184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 758184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 759184302Ssam IEEE80211_CHAN_B); 760184302Ssam if (c != NULL) 761184302Ssam chan = c; 762184302Ssam } 763184302Ssam return chan; 764184302Ssam} 765184302Ssam 766178354Ssamstatic int 767170530Ssammaxrate(const struct ieee80211_scan_entry *se) 768170530Ssam{ 769178354Ssam const struct ieee80211_ie_htcap *htcap = 770178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 771219601Sbschmidt int rmax, r, i, txstream; 772178354Ssam uint16_t caps; 773219601Sbschmidt uint8_t txparams; 774170530Ssam 775170530Ssam rmax = 0; 776178354Ssam if (htcap != NULL) { 777178354Ssam /* 778178354Ssam * HT station; inspect supported MCS and then adjust 779219601Sbschmidt * rate by channel width. 780178354Ssam */ 781219601Sbschmidt txparams = htcap->hc_mcsset[12]; 782219601Sbschmidt if (txparams & 0x3) { 783219601Sbschmidt /* 784219601Sbschmidt * TX MCS parameters defined and not equal to RX, 785219601Sbschmidt * extract the number of spartial streams and 786219601Sbschmidt * map it to the highest MCS rate. 787219601Sbschmidt */ 788219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 789219601Sbschmidt i = txstream * 8 - 1; 790219601Sbschmidt } else 791219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 792178354Ssam if (i >= 0) { 793178354Ssam caps = LE_READ_2(&htcap->hc_cap); 794219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 795219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 796178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 797219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 798219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 799219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 800219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 801178354Ssam else 802219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 803178354Ssam } 804178354Ssam } 805170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 806170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 807170530Ssam if (r > rmax) 808170530Ssam rmax = r; 809170530Ssam } 810170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 811170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 812170530Ssam if (r > rmax) 813170530Ssam rmax = r; 814170530Ssam } 815170530Ssam return rmax; 816170530Ssam} 817170530Ssam 818170530Ssam/* 819170530Ssam * Compare the capabilities of two entries and decide which is 820170530Ssam * more desirable (return >0 if a is considered better). Note 821170530Ssam * that we assume compatibility/usability has already been checked 822170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 823170530Ssam * Used to select the best scan candidate for association in a BSS. 824170530Ssam */ 825170530Ssamstatic int 826170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 827170530Ssam{ 828170530Ssam#define PREFER(_a,_b,_what) do { \ 829170530Ssam if (((_a) ^ (_b)) & (_what)) \ 830170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 831170530Ssam} while (0) 832178354Ssam int maxa, maxb; 833170530Ssam int8_t rssia, rssib; 834170530Ssam int weight; 835170530Ssam 836170530Ssam /* privacy support */ 837170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 838170530Ssam IEEE80211_CAPINFO_PRIVACY); 839170530Ssam 840170530Ssam /* compare count of previous failures */ 841170530Ssam weight = b->se_fails - a->se_fails; 842170530Ssam if (abs(weight) > 1) 843170530Ssam return weight; 844170530Ssam 845170530Ssam /* 846170530Ssam * Compare rssi. If the two are considered equivalent 847170530Ssam * then fallback to other criteria. We threshold the 848170530Ssam * comparisons to avoid selecting an ap purely by rssi 849170530Ssam * when both values may be good but one ap is otherwise 850170530Ssam * more desirable (e.g. an 11b-only ap with stronger 851170530Ssam * signal than an 11g ap). 852170530Ssam */ 853170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 854170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 855170530Ssam if (abs(rssib - rssia) < 5) { 856170530Ssam /* best/max rate preferred if signal level close enough XXX */ 857170530Ssam maxa = maxrate(&a->base); 858170530Ssam maxb = maxrate(&b->base); 859170530Ssam if (maxa != maxb) 860170530Ssam return maxa - maxb; 861170530Ssam /* XXX use freq for channel preference */ 862170530Ssam /* for now just prefer 5Ghz band to all other bands */ 863178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 864178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 865170530Ssam } 866170530Ssam /* all things being equal, use signal level */ 867170530Ssam return a->base.se_rssi - b->base.se_rssi; 868170530Ssam#undef PREFER 869170530Ssam} 870170530Ssam 871170530Ssam/* 872170530Ssam * Check rate set suitability and return the best supported rate. 873178354Ssam * XXX inspect MCS for HT 874170530Ssam */ 875170530Ssamstatic int 876184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 877184302Ssam const struct ieee80211_scan_entry *se) 878170530Ssam{ 879170530Ssam#define RV(v) ((v) & IEEE80211_RATE_VAL) 880170530Ssam const struct ieee80211_rateset *srs; 881178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 882170530Ssam const uint8_t *rs; 883170530Ssam 884178354Ssam okrate = badrate = 0; 885170530Ssam 886184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 887170530Ssam nrs = se->se_rates[1]; 888170530Ssam rs = se->se_rates+2; 889178354Ssam /* XXX MCS */ 890184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 891170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 892170530Ssamagain: 893170530Ssam for (i = 0; i < nrs; i++) { 894170530Ssam r = RV(rs[i]); 895170530Ssam badrate = r; 896170530Ssam /* 897170530Ssam * Check any fixed rate is included. 898170530Ssam */ 899178354Ssam if (r == ucastrate) 900170530Ssam fixedrate = r; 901170530Ssam /* 902170530Ssam * Check against our supported rates. 903170530Ssam */ 904170530Ssam for (j = 0; j < srs->rs_nrates; j++) 905170530Ssam if (r == RV(srs->rs_rates[j])) { 906170530Ssam if (r > okrate) /* NB: track max */ 907170530Ssam okrate = r; 908170530Ssam break; 909170530Ssam } 910170530Ssam 911170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 912170530Ssam /* 913170530Ssam * Don't try joining a BSS, if we don't support 914170530Ssam * one of its basic rates. 915170530Ssam */ 916170530Ssam okrate = 0; 917170530Ssam goto back; 918170530Ssam } 919170530Ssam } 920170530Ssam if (rs == se->se_rates+2) { 921170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 922170530Ssam nrs = se->se_xrates[1]; 923170530Ssam rs = se->se_xrates+2; 924170530Ssam goto again; 925170530Ssam } 926170530Ssam 927170530Ssamback: 928178354Ssam if (okrate == 0 || ucastrate != fixedrate) 929170530Ssam return badrate | IEEE80211_RATE_BASIC; 930170530Ssam else 931170530Ssam return RV(okrate); 932170530Ssam#undef RV 933170530Ssam} 934170530Ssam 935195618Srpaulostatic __inline int 936195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 937195618Srpaulo{ 938195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 939195618Srpaulo} 940195618Srpaulo 941170530Ssamstatic int 942170530Ssammatch_ssid(const uint8_t *ie, 943170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 944170530Ssam{ 945170530Ssam int i; 946170530Ssam 947170530Ssam for (i = 0; i < nssid; i++) { 948195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 949170530Ssam return 1; 950170530Ssam } 951170530Ssam return 0; 952170530Ssam} 953170530Ssam 954186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 955186904Ssamstatic int 956186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 957186904Ssam{ 958186904Ssam int slot, slotcnt; 959186904Ssam 960186904Ssam slotcnt = tdma->tdma_slotcnt; 961186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 962186904Ssam if (isclr(tdma->tdma_inuse, slot)) 963186904Ssam return 0; 964186904Ssam return 1; 965186904Ssam} 966186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 967186904Ssam 968170530Ssam/* 969170530Ssam * Test a scan candidate for suitability/compatibility. 970170530Ssam */ 971170530Ssamstatic int 972178354Ssammatch_bss(struct ieee80211vap *vap, 973170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 974170530Ssam int debug) 975170530Ssam{ 976178354Ssam struct ieee80211com *ic = vap->iv_ic; 977170530Ssam struct ieee80211_scan_entry *se = &se0->base; 978178354Ssam uint8_t rate; 979178354Ssam int fail; 980170530Ssam 981170530Ssam fail = 0; 982170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 983171409Ssam fail |= MATCH_CHANNEL; 984170530Ssam /* 985170530Ssam * NB: normally the desired mode is used to construct 986170530Ssam * the channel list, but it's possible for the scan 987170530Ssam * cache to include entries for stations outside this 988170530Ssam * list so we check the desired mode here to weed them 989170530Ssam * out. 990170530Ssam */ 991178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 992170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 993178354Ssam chanflags[vap->iv_des_mode]) 994171409Ssam fail |= MATCH_CHANNEL; 995178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 996170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 997171409Ssam fail |= MATCH_CAPINFO; 998186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 999186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 1000186904Ssam /* 1001186904Ssam * Adhoc demo network setup shouldn't really be scanning 1002186904Ssam * but just in case skip stations operating in IBSS or 1003186904Ssam * BSS mode. 1004186904Ssam */ 1005186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1006186904Ssam fail |= MATCH_CAPINFO; 1007186904Ssam /* 1008186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1009186904Ssam * skip if IBSS or ESS capabilities are marked and require 1010186904Ssam * the beacon have a TDMA ie present. 1011186904Ssam */ 1012186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1013186904Ssam const struct ieee80211_tdma_param *tdma = 1014186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1015189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1016186904Ssam 1017186904Ssam if (tdma == NULL) 1018186904Ssam fail |= MATCH_TDMA_NOIE; 1019189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1020189980Ssam fail |= MATCH_TDMA_VERSION; 1021186904Ssam else if (tdma->tdma_slot != 0) 1022186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1023186904Ssam else if (tdma_isfull(tdma)) 1024186904Ssam fail |= MATCH_TDMA_NOSLOT; 1025186904Ssam#if 0 1026186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1027186904Ssam fail |= MATCH_TDMA_LOCAL; 1028186904Ssam#endif 1029186904Ssam } 1030186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1031195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1032195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1033195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1034195618Srpaulo /* 1035195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1036195618Srpaulo * and two special ie's that must be present. 1037195618Srpaulo */ 1038195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1039195618Srpaulo fail |= MATCH_CAPINFO; 1040215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1041195618Srpaulo fail |= MATCH_MESH_NOID; 1042195618Srpaulo else if (ms->ms_idlen != 0 && 1043195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1044195618Srpaulo fail |= MATCH_MESHID; 1045196005Ssam#endif 1046170530Ssam } else { 1047170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1048171409Ssam fail |= MATCH_CAPINFO; 1049178354Ssam /* 1050178354Ssam * If 11d is enabled and we're attempting to join a bss 1051178354Ssam * that advertises it's country code then compare our 1052178354Ssam * current settings to what we fetched from the country ie. 1053178354Ssam * If our country code is unspecified or different then do 1054178354Ssam * not attempt to join the bss. We should have already 1055178354Ssam * dispatched an event to user space that identifies the 1056178354Ssam * new country code so our regdomain config should match. 1057178354Ssam */ 1058178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1059178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1060178354Ssam se->se_cc[0] != 0 && 1061178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1062178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1063178354Ssam fail |= MATCH_CC; 1064170530Ssam } 1065178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1066170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1067171409Ssam fail |= MATCH_PRIVACY; 1068170530Ssam } else { 1069170530Ssam /* XXX does this mean privacy is supported or required? */ 1070170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1071171409Ssam fail |= MATCH_PRIVACY; 1072170530Ssam } 1073184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1074184302Ssam rate = check_rate(vap, se->se_chan, se); 1075184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1076171409Ssam fail |= MATCH_RATE; 1077184302Ssam /* 1078184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1079184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1080184302Ssam * in the scan list to 11b and retry the rate check. 1081184302Ssam */ 1082184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1083184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1084184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1085184302Ssam fail &= ~MATCH_RATE; 1086184302Ssam se0->se_flags |= STA_DEMOTE11B; 1087184302Ssam } 1088184302Ssam } 1089184302Ssam } else if (rate < 2*24) { 1090184302Ssam /* 1091184302Ssam * This is an 11b-only ap. Check the desired mode in 1092184302Ssam * case that needs to be honored (mode 11g filters out 1093184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1094184302Ssam * in scanning to be demoted. 1095184302Ssam * 1096184302Ssam * NB: we cheat a bit here by looking at the max rate; 1097184302Ssam * we could/should check the rates. 1098184302Ssam */ 1099184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1100184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1101184302Ssam fail |= MATCH_RATE; 1102184302Ssam else 1103184302Ssam se0->se_flags |= STA_DEMOTE11B; 1104184302Ssam } 1105170530Ssam if (ss->ss_nssid != 0 && 1106171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1107171409Ssam fail |= MATCH_SSID; 1108178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1109178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1110178354Ssam fail |= MATCH_BSSID; 1111170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1112171409Ssam fail |= MATCH_FAILS; 1113170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1114171409Ssam fail |= MATCH_NOTSEEN; 1115170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1116171409Ssam fail |= MATCH_RSSI; 1117170530Ssam#ifdef IEEE80211_DEBUG 1118178354Ssam if (ieee80211_msg(vap, debug)) { 1119170530Ssam printf(" %c %s", 1120171409Ssam fail & MATCH_FAILS ? '=' : 1121171409Ssam fail & MATCH_NOTSEEN ? '^' : 1122178354Ssam fail & MATCH_CC ? '$' : 1123186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1124186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1125189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1126189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1127189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1128189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1129186904Ssam#endif 1130195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1131171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1132170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1133171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1134170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1135171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1136171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1137170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1138171409Ssam fail & MATCH_RATE ? '!' : ' '); 1139170530Ssam printf(" %4s%c", 1140170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1141189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1142171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1143170530Ssam printf(" %3s%c ", 1144170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1145170530Ssam "wep" : "no", 1146171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1147170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1148195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1149170530Ssam } 1150170530Ssam#endif 1151170530Ssam return fail; 1152170530Ssam} 1153170530Ssam 1154170530Ssamstatic void 1155170530Ssamsta_update_notseen(struct sta_table *st) 1156170530Ssam{ 1157170530Ssam struct sta_entry *se; 1158170530Ssam 1159206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1160170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1161170530Ssam /* 1162170530Ssam * If seen the reset and don't bump the count; 1163170530Ssam * otherwise bump the ``not seen'' count. Note 1164170530Ssam * that this insures that stations for which we 1165170530Ssam * see frames while not scanning but not during 1166170530Ssam * this scan will not be penalized. 1167170530Ssam */ 1168170530Ssam if (se->se_seen) 1169170530Ssam se->se_seen = 0; 1170170530Ssam else 1171170530Ssam se->se_notseen++; 1172170530Ssam } 1173206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1174170530Ssam} 1175170530Ssam 1176170530Ssamstatic void 1177170530Ssamsta_dec_fails(struct sta_table *st) 1178170530Ssam{ 1179170530Ssam struct sta_entry *se; 1180170530Ssam 1181206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1182170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1183170530Ssam if (se->se_fails) 1184170530Ssam se->se_fails--; 1185206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1186170530Ssam} 1187170530Ssam 1188170530Ssamstatic struct sta_entry * 1189178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1190170530Ssam{ 1191170530Ssam struct sta_table *st = ss->ss_priv; 1192170530Ssam struct sta_entry *se, *selbs = NULL; 1193170530Ssam 1194178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1195170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1196206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1197170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1198184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1199178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1200170530Ssam if (selbs == NULL) 1201170530Ssam selbs = se; 1202170530Ssam else if (sta_compare(se, selbs) > 0) 1203170530Ssam selbs = se; 1204170530Ssam } 1205170530Ssam } 1206206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1207170530Ssam 1208170530Ssam return selbs; 1209170530Ssam} 1210170530Ssam 1211170530Ssam/* 1212170530Ssam * Pick an ap or ibss network to join or find a channel 1213170530Ssam * to use to start an ibss network. 1214170530Ssam */ 1215170530Ssamstatic int 1216178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1217170530Ssam{ 1218170530Ssam struct sta_table *st = ss->ss_priv; 1219170530Ssam struct sta_entry *selbs; 1220184274Ssam struct ieee80211_channel *chan; 1221170530Ssam 1222178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1223178354Ssam ("wrong mode %u", vap->iv_opmode)); 1224170530Ssam 1225170530Ssam if (st->st_newscan) { 1226170530Ssam sta_update_notseen(st); 1227170530Ssam st->st_newscan = 0; 1228170530Ssam } 1229170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1230170530Ssam /* 1231170530Ssam * Manual/background scan, don't select+join the 1232170530Ssam * bss, just return. The scanning framework will 1233170530Ssam * handle notification that this has completed. 1234170530Ssam */ 1235170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1236170530Ssam return 1; 1237170530Ssam } 1238170530Ssam /* 1239170530Ssam * Automatic sequencing; look for a candidate and 1240170530Ssam * if found join the network. 1241170530Ssam */ 1242170530Ssam /* NB: unlocked read should be ok */ 1243170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1244178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1245170530Ssam "%s: no scan candidate\n", __func__); 1246178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1247178354Ssam return 0; 1248170530Ssamnotfound: 1249170530Ssam /* 1250170530Ssam * If nothing suitable was found decrement 1251170530Ssam * the failure counts so entries will be 1252170530Ssam * reconsidered the next time around. We 1253170530Ssam * really want to do this only for sta's 1254170530Ssam * where we've previously had some success. 1255170530Ssam */ 1256170530Ssam sta_dec_fails(st); 1257170530Ssam st->st_newscan = 1; 1258170530Ssam return 0; /* restart scan */ 1259170530Ssam } 1260178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1261178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1262178354Ssam return (selbs != NULL); 1263184274Ssam if (selbs == NULL) 1264170530Ssam goto notfound; 1265184274Ssam chan = selbs->base.se_chan; 1266184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1267184302Ssam chan = demote11b(vap, chan); 1268184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1269184274Ssam goto notfound; 1270170530Ssam return 1; /* terminate scan */ 1271170530Ssam} 1272170530Ssam 1273170530Ssam/* 1274170530Ssam * Lookup an entry in the scan cache. We assume we're 1275170530Ssam * called from the bottom half or such that we don't need 1276170530Ssam * to block the bottom half so that it's safe to return 1277170530Ssam * a reference to an entry w/o holding the lock on the table. 1278170530Ssam */ 1279170530Ssamstatic struct sta_entry * 1280170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1281170530Ssam{ 1282170530Ssam struct sta_entry *se; 1283170530Ssam int hash = STA_HASH(macaddr); 1284170530Ssam 1285206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1286170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1287170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1288170530Ssam break; 1289206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1290170530Ssam 1291170530Ssam return se; /* NB: unlocked */ 1292170530Ssam} 1293170530Ssam 1294170530Ssamstatic void 1295178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1296170530Ssam{ 1297178354Ssam struct ieee80211com *ic = vap->iv_ic; 1298178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1299170530Ssam struct sta_table *st = ss->ss_priv; 1300178354Ssam enum ieee80211_phymode mode; 1301170530Ssam struct sta_entry *se, *selbs; 1302178354Ssam uint8_t roamRate, curRate, ucastRate; 1303170530Ssam int8_t roamRssi, curRssi; 1304170530Ssam 1305170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1306170530Ssam if (se == NULL) { 1307170530Ssam /* XXX something is wrong */ 1308170530Ssam return; 1309170530Ssam } 1310170530Ssam 1311178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1312178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1313178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1314178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1315170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1316170530Ssam curRssi = ic->ic_node_getrssi(ni); 1317178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1318178354Ssam curRate = ni->ni_txrate; 1319178354Ssam roamRate &= IEEE80211_RATE_VAL; 1320178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1321170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1322170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1323170530Ssam } else { 1324170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1325178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1326170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1327170530Ssam } 1328170530Ssam /* 1329170530Ssam * Check if a new ap should be used and switch. 1330170530Ssam * XXX deauth current ap 1331170530Ssam */ 1332170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1333178354Ssam if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1334170530Ssam /* 1335170530Ssam * Scan cache contents are too old; force a scan now 1336170530Ssam * if possible so we have current state to make a 1337170530Ssam * decision with. We don't kick off a bg scan if 1338170530Ssam * we're using dynamic turbo and boosted or if the 1339170530Ssam * channel is busy. 1340170530Ssam * XXX force immediate switch on scan complete 1341170530Ssam */ 1342170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1343178354Ssam time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1344178354Ssam ieee80211_bg_scan(vap, 0); 1345170530Ssam return; 1346170530Ssam } 1347170530Ssam se->base.se_rssi = curRssi; 1348178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1349170530Ssam if (selbs != NULL && selbs != se) { 1350184274Ssam struct ieee80211_channel *chan; 1351184274Ssam 1352178354Ssam IEEE80211_DPRINTF(vap, 1353170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1354170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1355170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1356170530Ssam curRate, roamRate, curRssi, roamRssi); 1357184274Ssam 1358184274Ssam chan = selbs->base.se_chan; 1359184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1360184302Ssam chan = demote11b(vap, chan); 1361184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1362170530Ssam } 1363170530Ssam } 1364170530Ssam} 1365170530Ssam 1366170530Ssam/* 1367170530Ssam * Age entries in the scan cache. 1368170530Ssam * XXX also do roaming since it's convenient 1369170530Ssam */ 1370170530Ssamstatic void 1371170530Ssamsta_age(struct ieee80211_scan_state *ss) 1372170530Ssam{ 1373178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1374170530Ssam 1375178354Ssam adhoc_age(ss); 1376170530Ssam /* 1377170530Ssam * If rate control is enabled check periodically to see if 1378170530Ssam * we should roam from our current connection to one that 1379170530Ssam * might be better. This only applies when we're operating 1380170530Ssam * in sta mode and automatic roaming is set. 1381170530Ssam * XXX defer if busy 1382170530Ssam * XXX repeater station 1383170530Ssam * XXX do when !bgscan? 1384170530Ssam */ 1385178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1386178354Ssam ("wrong mode %u", vap->iv_opmode)); 1387178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1388213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1389178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1390170530Ssam /* XXX vap is implicit */ 1391178354Ssam sta_roam_check(ss, vap); 1392170530Ssam} 1393170530Ssam 1394170530Ssam/* 1395170530Ssam * Iterate over the entries in the scan cache, invoking 1396170530Ssam * the callback function on each one. 1397170530Ssam */ 1398170530Ssamstatic void 1399170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1400170530Ssam ieee80211_scan_iter_func *f, void *arg) 1401170530Ssam{ 1402170530Ssam struct sta_table *st = ss->ss_priv; 1403170530Ssam struct sta_entry *se; 1404170530Ssam u_int gen; 1405170530Ssam 1406283556Sadrian IEEE80211_SCAN_ITER_LOCK(st); 1407178354Ssam gen = st->st_scaniter++; 1408170530Ssamrestart: 1409206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1410170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1411170530Ssam if (se->se_scangen != gen) { 1412170530Ssam se->se_scangen = gen; 1413170530Ssam /* update public state */ 1414170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1415206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1416170530Ssam (*f)(arg, &se->base); 1417170530Ssam goto restart; 1418170530Ssam } 1419170530Ssam } 1420206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1421170530Ssam 1422283556Sadrian IEEE80211_SCAN_ITER_UNLOCK(st); 1423170530Ssam} 1424170530Ssam 1425170530Ssamstatic void 1426170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1427170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1428170530Ssam{ 1429170530Ssam struct sta_table *st = ss->ss_priv; 1430170530Ssam struct sta_entry *se; 1431170530Ssam 1432170530Ssam se = sta_lookup(st, macaddr); 1433170530Ssam if (se != NULL) { 1434170530Ssam se->se_fails++; 1435170530Ssam se->se_lastfail = ticks; 1436178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1437170530Ssam macaddr, "%s: reason %u fails %u", 1438170530Ssam __func__, reason, se->se_fails); 1439170530Ssam } 1440170530Ssam} 1441170530Ssam 1442170530Ssamstatic void 1443170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1444170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1445170530Ssam{ 1446170530Ssam struct sta_table *st = ss->ss_priv; 1447170530Ssam struct sta_entry *se; 1448170530Ssam 1449170530Ssam se = sta_lookup(st, macaddr); 1450170530Ssam if (se != NULL) { 1451170530Ssam#if 0 1452170530Ssam se->se_fails = 0; 1453178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1454170530Ssam macaddr, "%s: fails %u", 1455170530Ssam __func__, se->se_fails); 1456170530Ssam#endif 1457170530Ssam se->se_lastassoc = ticks; 1458170530Ssam } 1459170530Ssam} 1460170530Ssam 1461170530Ssamstatic const struct ieee80211_scanner sta_default = { 1462170530Ssam .scan_name = "default", 1463170530Ssam .scan_attach = sta_attach, 1464170530Ssam .scan_detach = sta_detach, 1465170530Ssam .scan_start = sta_start, 1466170530Ssam .scan_restart = sta_restart, 1467170530Ssam .scan_cancel = sta_cancel, 1468170530Ssam .scan_end = sta_pick_bss, 1469170530Ssam .scan_flush = sta_flush, 1470170530Ssam .scan_add = sta_add, 1471170530Ssam .scan_age = sta_age, 1472170530Ssam .scan_iterate = sta_iterate, 1473170530Ssam .scan_assoc_fail = sta_assoc_fail, 1474170530Ssam .scan_assoc_success = sta_assoc_success, 1475170530Ssam}; 1476195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1477170530Ssam 1478170530Ssam/* 1479170530Ssam * Adhoc mode-specific support. 1480170530Ssam */ 1481170530Ssam 1482170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1483170530Ssam{ 5180, 5200, 5220, 5240 }; 1484170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1485170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1486170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1487170530Ssam{ 5170, 5190, 5210, 5230 }; 1488170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1489170530Ssam{ 2457, 2462 }; 1490170530Ssam 1491170530Ssamstatic const struct scanlist adhocScanTable[] = { 1492170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1493170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1494170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1495170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1496170530Ssam { .list = NULL } 1497170530Ssam}; 1498170530Ssam#undef X 1499170530Ssam 1500170530Ssam/* 1501170530Ssam * Start an adhoc-mode scan by populating the channel list. 1502170530Ssam */ 1503170530Ssamstatic int 1504178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1505170530Ssam{ 1506170530Ssam struct sta_table *st = ss->ss_priv; 1507170530Ssam 1508178354Ssam makescanlist(ss, vap, adhocScanTable); 1509176653Ssam 1510178354Ssam if (ss->ss_mindwell == 0) 1511178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1512178354Ssam if (ss->ss_maxdwell == 0) 1513178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1514176653Ssam 1515178354Ssam st->st_scangen++; 1516170530Ssam st->st_newscan = 1; 1517170530Ssam 1518170530Ssam return 0; 1519170530Ssam} 1520170530Ssam 1521170530Ssam/* 1522170530Ssam * Select a channel to start an adhoc network on. 1523170530Ssam * The channel list was populated with appropriate 1524170530Ssam * channels so select one that looks least occupied. 1525170530Ssam */ 1526170530Ssamstatic struct ieee80211_channel * 1527178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1528170530Ssam{ 1529170530Ssam struct sta_table *st = ss->ss_priv; 1530170530Ssam struct sta_entry *se; 1531170530Ssam struct ieee80211_channel *c, *bestchan; 1532170530Ssam int i, bestrssi, maxrssi; 1533170530Ssam 1534170530Ssam bestchan = NULL; 1535170530Ssam bestrssi = -1; 1536170530Ssam 1537206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1538170530Ssam for (i = 0; i < ss->ss_last; i++) { 1539170530Ssam c = ss->ss_chans[i]; 1540178354Ssam /* never consider a channel with radar */ 1541178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1542176653Ssam continue; 1543178354Ssam /* skip channels disallowed by regulatory settings */ 1544178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1545178354Ssam continue; 1546178354Ssam /* check channel attributes for band compatibility */ 1547178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1548178354Ssam continue; 1549170530Ssam maxrssi = 0; 1550170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1551170530Ssam if (se->base.se_chan != c) 1552170530Ssam continue; 1553170530Ssam if (se->base.se_rssi > maxrssi) 1554170530Ssam maxrssi = se->base.se_rssi; 1555170530Ssam } 1556170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1557170530Ssam bestchan = c; 1558170530Ssam } 1559206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1560170530Ssam 1561170530Ssam return bestchan; 1562170530Ssam} 1563170530Ssam 1564170530Ssam/* 1565170530Ssam * Pick an ibss network to join or find a channel 1566170530Ssam * to use to start an ibss network. 1567170530Ssam */ 1568170530Ssamstatic int 1569178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1570170530Ssam{ 1571170530Ssam struct sta_table *st = ss->ss_priv; 1572170530Ssam struct sta_entry *selbs; 1573170530Ssam struct ieee80211_channel *chan; 1574245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1575170530Ssam 1576178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1577195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1578195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1579178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1580170530Ssam 1581170530Ssam if (st->st_newscan) { 1582170530Ssam sta_update_notseen(st); 1583170530Ssam st->st_newscan = 0; 1584170530Ssam } 1585170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1586170530Ssam /* 1587170530Ssam * Manual/background scan, don't select+join the 1588170530Ssam * bss, just return. The scanning framework will 1589170530Ssam * handle notification that this has completed. 1590170530Ssam */ 1591170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1592170530Ssam return 1; 1593170530Ssam } 1594170530Ssam /* 1595170530Ssam * Automatic sequencing; look for a candidate and 1596170530Ssam * if found join the network. 1597170530Ssam */ 1598170530Ssam /* NB: unlocked read should be ok */ 1599170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1600178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1601170530Ssam "%s: no scan candidate\n", __func__); 1602178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1603178354Ssam return 0; 1604170530Ssamnotfound: 1605186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1606186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1607186904Ssam if (vap->iv_des_nssid && 1608186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1609186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1610186904Ssam#else 1611178354Ssam if (vap->iv_des_nssid) { 1612186904Ssam#endif 1613170530Ssam /* 1614170530Ssam * No existing adhoc network to join and we have 1615170530Ssam * an ssid; start one up. If no channel was 1616170530Ssam * specified, try to select a channel. 1617170530Ssam */ 1618178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1619178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1620183421Ssam chan = adhoc_pick_channel(ss, 0); 1621178354Ssam } else 1622178354Ssam chan = vap->iv_des_chan; 1623170530Ssam if (chan != NULL) { 1624245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1625245928Sadrian /* 1626245928Sadrian * Create a HT capable IBSS; the per-node 1627245928Sadrian * probe request/response will result in 1628245928Sadrian * "correct" rate control capabilities being 1629245928Sadrian * negotiated. 1630245928Sadrian */ 1631245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1632245928Sadrian chan, vap->iv_flags_ht); 1633178354Ssam ieee80211_create_ibss(vap, chan); 1634170530Ssam return 1; 1635170530Ssam } 1636170530Ssam } 1637170530Ssam /* 1638170530Ssam * If nothing suitable was found decrement 1639170530Ssam * the failure counts so entries will be 1640170530Ssam * reconsidered the next time around. We 1641170530Ssam * really want to do this only for sta's 1642170530Ssam * where we've previously had some success. 1643170530Ssam */ 1644170530Ssam sta_dec_fails(st); 1645170530Ssam st->st_newscan = 1; 1646170530Ssam return 0; /* restart scan */ 1647170530Ssam } 1648178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1649178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1650178354Ssam return (selbs != NULL); 1651184274Ssam if (selbs == NULL) 1652170530Ssam goto notfound; 1653184274Ssam chan = selbs->base.se_chan; 1654184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1655184302Ssam chan = demote11b(vap, chan); 1656245928Sadrian /* 1657245928Sadrian * If HT is available, make it a possibility here. 1658245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1659245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1660245928Sadrian * to any subsequent nodes that support it. 1661245928Sadrian */ 1662245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1663245928Sadrian chan, vap->iv_flags_ht); 1664184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1665184274Ssam goto notfound; 1666170530Ssam return 1; /* terminate scan */ 1667170530Ssam} 1668170530Ssam 1669170530Ssam/* 1670170530Ssam * Age entries in the scan cache. 1671170530Ssam */ 1672170530Ssamstatic void 1673170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1674170530Ssam{ 1675170530Ssam struct sta_table *st = ss->ss_priv; 1676170530Ssam struct sta_entry *se, *next; 1677170530Ssam 1678206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1679170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1680170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1681170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1682170530Ssam LIST_REMOVE(se, se_hash); 1683178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1684283538Sadrian IEEE80211_FREE(se, M_80211_SCAN); 1685170530Ssam } 1686170530Ssam } 1687206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1688170530Ssam} 1689170530Ssam 1690170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1691170530Ssam .scan_name = "default", 1692170530Ssam .scan_attach = sta_attach, 1693170530Ssam .scan_detach = sta_detach, 1694170530Ssam .scan_start = adhoc_start, 1695170530Ssam .scan_restart = sta_restart, 1696170530Ssam .scan_cancel = sta_cancel, 1697170530Ssam .scan_end = adhoc_pick_bss, 1698170530Ssam .scan_flush = sta_flush, 1699178354Ssam .scan_pickchan = adhoc_pick_channel, 1700170530Ssam .scan_add = sta_add, 1701170530Ssam .scan_age = adhoc_age, 1702170530Ssam .scan_iterate = sta_iterate, 1703170530Ssam .scan_assoc_fail = sta_assoc_fail, 1704170530Ssam .scan_assoc_success = sta_assoc_success, 1705170530Ssam}; 1706195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1707195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1708170530Ssam 1709178354Ssamstatic void 1710178354Ssamap_force_promisc(struct ieee80211com *ic) 1711178354Ssam{ 1712178354Ssam struct ifnet *ifp = ic->ic_ifp; 1713178354Ssam 1714178354Ssam IEEE80211_LOCK(ic); 1715178354Ssam /* set interface into promiscuous mode */ 1716178354Ssam ifp->if_flags |= IFF_PROMISC; 1717191746Sthompsa ieee80211_runtask(ic, &ic->ic_promisc_task); 1718178354Ssam IEEE80211_UNLOCK(ic); 1719178354Ssam} 1720178354Ssam 1721178354Ssamstatic void 1722178354Ssamap_reset_promisc(struct ieee80211com *ic) 1723178354Ssam{ 1724178354Ssam IEEE80211_LOCK(ic); 1725178354Ssam ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1726178354Ssam IEEE80211_UNLOCK(ic); 1727178354Ssam} 1728178354Ssam 1729178354Ssamstatic int 1730178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1731178354Ssam{ 1732178354Ssam struct sta_table *st = ss->ss_priv; 1733178354Ssam 1734178354Ssam makescanlist(ss, vap, staScanTable); 1735178354Ssam 1736178354Ssam if (ss->ss_mindwell == 0) 1737178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1738178354Ssam if (ss->ss_maxdwell == 0) 1739178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1740178354Ssam 1741178354Ssam st->st_scangen++; 1742178354Ssam st->st_newscan = 1; 1743178354Ssam 1744178354Ssam ap_force_promisc(vap->iv_ic); 1745178354Ssam return 0; 1746178354Ssam} 1747178354Ssam 1748170530Ssam/* 1749178354Ssam * Cancel an ongoing scan. 1750170530Ssam */ 1751170530Ssamstatic int 1752178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1753170530Ssam{ 1754178354Ssam ap_reset_promisc(vap->iv_ic); 1755178354Ssam return 0; 1756178354Ssam} 1757178354Ssam 1758178354Ssam/* 1759178354Ssam * Pick a quiet channel to use for ap operation. 1760178354Ssam */ 1761178354Ssamstatic struct ieee80211_channel * 1762178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1763178354Ssam{ 1764178354Ssam struct sta_table *st = ss->ss_priv; 1765178354Ssam struct ieee80211_channel *bestchan = NULL; 1766178354Ssam int i; 1767178354Ssam 1768178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1769178354Ssam /* NB: use scan list order to preserve channel preference */ 1770178354Ssam for (i = 0; i < ss->ss_last; i++) { 1771178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1772178354Ssam /* 1773178354Ssam * If the channel is unoccupied the max rssi 1774178354Ssam * should be zero; just take it. Otherwise 1775178354Ssam * track the channel with the lowest rssi and 1776178354Ssam * use that when all channels appear occupied. 1777178354Ssam */ 1778178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1779178354Ssam continue; 1780178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1781178354Ssam continue; 1782178354Ssam /* check channel attributes for band compatibility */ 1783178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1784178354Ssam continue; 1785186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1786178354Ssam /* XXX channel have interference */ 1787178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1788178354Ssam /* XXX use other considerations */ 1789178354Ssam return chan; 1790170530Ssam } 1791178354Ssam if (bestchan == NULL || 1792178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1793178354Ssam bestchan = chan; 1794178354Ssam } 1795178354Ssam return bestchan; 1796178354Ssam} 1797178354Ssam 1798178354Ssam/* 1799178354Ssam * Pick a quiet channel to use for ap operation. 1800178354Ssam */ 1801178354Ssamstatic int 1802178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1803178354Ssam{ 1804178354Ssam struct ieee80211com *ic = vap->iv_ic; 1805178354Ssam struct ieee80211_channel *bestchan; 1806178354Ssam 1807178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1808178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1809178354Ssam bestchan = ap_pick_channel(ss, 0); 1810178354Ssam if (bestchan == NULL) { 1811178354Ssam /* no suitable channel, should not happen */ 1812178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1813178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1814178354Ssam /* XXX print something? */ 1815178354Ssam return 0; /* restart scan */ 1816178354Ssam } 1817178354Ssam /* 1818178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1819178354Ssam */ 1820178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1821178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1822178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1823178354Ssam if (bestchan == NULL) { 1824178354Ssam /* should never happen ?? */ 1825178354Ssam return 0; 1826170530Ssam } 1827170530Ssam } 1828178354Ssam ap_reset_promisc(ic); 1829178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1830178354Ssam /* 1831178354Ssam * Manual/background scan, don't select+join the 1832178354Ssam * bss, just return. The scanning framework will 1833178354Ssam * handle notification that this has completed. 1834178354Ssam */ 1835178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1836178354Ssam return 1; 1837178354Ssam } 1838178354Ssam ieee80211_create_ibss(vap, 1839193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1840178354Ssam return 1; 1841170530Ssam} 1842170530Ssam 1843178354Ssamstatic const struct ieee80211_scanner ap_default = { 1844178354Ssam .scan_name = "default", 1845178354Ssam .scan_attach = sta_attach, 1846178354Ssam .scan_detach = sta_detach, 1847178354Ssam .scan_start = ap_start, 1848178354Ssam .scan_restart = sta_restart, 1849178354Ssam .scan_cancel = ap_cancel, 1850178354Ssam .scan_end = ap_end, 1851178354Ssam .scan_flush = sta_flush, 1852178354Ssam .scan_pickchan = ap_pick_channel, 1853178354Ssam .scan_add = sta_add, 1854178354Ssam .scan_age = adhoc_age, 1855178354Ssam .scan_iterate = sta_iterate, 1856178354Ssam .scan_assoc_success = sta_assoc_success, 1857178354Ssam .scan_assoc_fail = sta_assoc_fail, 1858170530Ssam}; 1859195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1860178354Ssam 1861195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1862178354Ssam/* 1863195618Srpaulo * Pick an mbss network to join or find a channel 1864195618Srpaulo * to use to start an mbss network. 1865178354Ssam */ 1866195618Srpaulostatic int 1867195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1868195618Srpaulo{ 1869195618Srpaulo struct sta_table *st = ss->ss_priv; 1870195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1871195618Srpaulo struct sta_entry *selbs; 1872195618Srpaulo struct ieee80211_channel *chan; 1873195618Srpaulo 1874195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1875195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1876195618Srpaulo 1877195618Srpaulo if (st->st_newscan) { 1878195618Srpaulo sta_update_notseen(st); 1879195618Srpaulo st->st_newscan = 0; 1880195618Srpaulo } 1881195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1882195618Srpaulo /* 1883195618Srpaulo * Manual/background scan, don't select+join the 1884195618Srpaulo * bss, just return. The scanning framework will 1885195618Srpaulo * handle notification that this has completed. 1886195618Srpaulo */ 1887195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1888195618Srpaulo return 1; 1889195618Srpaulo } 1890195618Srpaulo /* 1891195618Srpaulo * Automatic sequencing; look for a candidate and 1892195618Srpaulo * if found join the network. 1893195618Srpaulo */ 1894195618Srpaulo /* NB: unlocked read should be ok */ 1895195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1896195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1897195618Srpaulo "%s: no scan candidate\n", __func__); 1898195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1899195618Srpaulo return 0; 1900195618Srpaulonotfound: 1901195618Srpaulo if (ms->ms_idlen != 0) { 1902195618Srpaulo /* 1903195618Srpaulo * No existing mbss network to join and we have 1904195618Srpaulo * a meshid; start one up. If no channel was 1905195618Srpaulo * specified, try to select a channel. 1906195618Srpaulo */ 1907195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1908195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1909195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1910195618Srpaulo 1911195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1912195618Srpaulo if (chan != NULL) 1913195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1914195618Srpaulo chan, vap->iv_flags_ht); 1915195618Srpaulo } else 1916195618Srpaulo chan = vap->iv_des_chan; 1917195618Srpaulo if (chan != NULL) { 1918195618Srpaulo ieee80211_create_ibss(vap, chan); 1919195618Srpaulo return 1; 1920195618Srpaulo } 1921195618Srpaulo } 1922195618Srpaulo /* 1923195618Srpaulo * If nothing suitable was found decrement 1924195618Srpaulo * the failure counts so entries will be 1925195618Srpaulo * reconsidered the next time around. We 1926195618Srpaulo * really want to do this only for sta's 1927195618Srpaulo * where we've previously had some success. 1928195618Srpaulo */ 1929195618Srpaulo sta_dec_fails(st); 1930195618Srpaulo st->st_newscan = 1; 1931195618Srpaulo return 0; /* restart scan */ 1932195618Srpaulo } 1933195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1934195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1935195618Srpaulo return (selbs != NULL); 1936195618Srpaulo if (selbs == NULL) 1937195618Srpaulo goto notfound; 1938195618Srpaulo chan = selbs->base.se_chan; 1939195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1940195618Srpaulo chan = demote11b(vap, chan); 1941195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1942195618Srpaulo goto notfound; 1943195618Srpaulo return 1; /* terminate scan */ 1944195618Srpaulo} 1945195618Srpaulo 1946195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1947195618Srpaulo .scan_name = "default", 1948195618Srpaulo .scan_attach = sta_attach, 1949195618Srpaulo .scan_detach = sta_detach, 1950195618Srpaulo .scan_start = adhoc_start, 1951195618Srpaulo .scan_restart = sta_restart, 1952195618Srpaulo .scan_cancel = sta_cancel, 1953195618Srpaulo .scan_end = mesh_pick_bss, 1954195618Srpaulo .scan_flush = sta_flush, 1955195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1956195618Srpaulo .scan_add = sta_add, 1957195618Srpaulo .scan_age = adhoc_age, 1958195618Srpaulo .scan_iterate = sta_iterate, 1959195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1960195618Srpaulo .scan_assoc_success = sta_assoc_success, 1961195618Srpaulo}; 1962195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1963195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1964