ieee80211_scan_sta.c revision 275875
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 275875 2014-12-18 05:17:18Z 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]; 105178354Ssam struct mtx 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 162186302Ssam st = (struct sta_table *) malloc(sizeof(struct sta_table), 163170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 164170530Ssam if (st == NULL) 165170530Ssam return 0; 166206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 167170530Ssam mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 168170530Ssam TAILQ_INIT(&st->st_entry); 169170530Ssam ss->ss_priv = st; 170170530Ssam nrefs++; /* NB: we assume caller locking */ 171170530Ssam return 1; 172170530Ssam} 173170530Ssam 174170530Ssam/* 175170530Ssam * Cleanup any private state. 176170530Ssam */ 177170530Ssamstatic int 178170530Ssamsta_detach(struct ieee80211_scan_state *ss) 179170530Ssam{ 180170530Ssam struct sta_table *st = ss->ss_priv; 181170530Ssam 182170530Ssam if (st != NULL) { 183170530Ssam sta_flush_table(st); 184206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 185170530Ssam mtx_destroy(&st->st_scanlock); 186186302Ssam free(st, M_80211_SCAN); 187170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 188170530Ssam nrefs--; /* NB: we assume caller locking */ 189170530Ssam } 190170530Ssam return 1; 191170530Ssam} 192170530Ssam 193170530Ssam/* 194170530Ssam * Flush all per-scan state. 195170530Ssam */ 196170530Ssamstatic int 197170530Ssamsta_flush(struct ieee80211_scan_state *ss) 198170530Ssam{ 199170530Ssam struct sta_table *st = ss->ss_priv; 200170530Ssam 201206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 202170530Ssam sta_flush_table(st); 203206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 204170530Ssam ss->ss_last = 0; 205170530Ssam return 0; 206170530Ssam} 207170530Ssam 208170530Ssam/* 209170530Ssam * Flush all entries in the scan cache. 210170530Ssam */ 211170530Ssamstatic void 212170530Ssamsta_flush_table(struct sta_table *st) 213170530Ssam{ 214170530Ssam struct sta_entry *se, *next; 215170530Ssam 216170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 217170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 218170530Ssam LIST_REMOVE(se, se_hash); 219178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 220186302Ssam free(se, M_80211_SCAN); 221170530Ssam } 222178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 223170530Ssam} 224170530Ssam 225170530Ssam/* 226170530Ssam * Process a beacon or probe response frame; create an 227170530Ssam * entry in the scan cache or update any previous entry. 228170530Ssam */ 229170530Ssamstatic int 230170530Ssamsta_add(struct ieee80211_scan_state *ss, 231170530Ssam const struct ieee80211_scanparams *sp, 232170530Ssam const struct ieee80211_frame *wh, 233192468Ssam int subtype, int rssi, int noise) 234170530Ssam{ 235170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 236170530Ssam#define PICK1ST(_ss) \ 237170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 238170530Ssam IEEE80211_SCAN_PICK1ST) 239170530Ssam struct sta_table *st = ss->ss_priv; 240170530Ssam const uint8_t *macaddr = wh->i_addr2; 241178354Ssam struct ieee80211vap *vap = ss->ss_vap; 242178354Ssam struct ieee80211com *ic = vap->iv_ic; 243224717Sbschmidt struct ieee80211_channel *c; 244170530Ssam struct sta_entry *se; 245170530Ssam struct ieee80211_scan_entry *ise; 246178354Ssam int hash; 247170530Ssam 248170530Ssam hash = STA_HASH(macaddr); 249170530Ssam 250206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 251170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 252170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 253170530Ssam goto found; 254186302Ssam se = (struct sta_entry *) malloc(sizeof(struct sta_entry), 255170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 256170530Ssam if (se == NULL) { 257206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 258170530Ssam return 0; 259170530Ssam } 260178354Ssam se->se_scangen = st->st_scaniter-1; 261178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 262170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 263170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 264170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 265170530Ssamfound: 266170530Ssam ise = &se->base; 267170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 268170530Ssam if (sp->ssid[1] != 0 && 269170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 270170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 271170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 272170530Ssam ("rate set too large: %u", sp->rates[1])); 273170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 274170530Ssam if (sp->xrates != NULL) { 275170530Ssam /* XXX validate xrates[1] */ 276178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 277170530Ssam ("xrate set too large: %u", sp->xrates[1])); 278170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 279170530Ssam } else 280170530Ssam ise->se_xrates[1] = 0; 281170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 282178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 283173368Ssam /* 284173368Ssam * Record rssi data using extended precision LPF filter. 285173368Ssam * 286173368Ssam * NB: use only on-channel data to insure we get a good 287173368Ssam * estimate of the signal we'll see when associated. 288173368Ssam */ 289178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 290178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 291173368Ssam ise->se_noise = noise; 292173368Ssam } 293170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 294170530Ssam ise->se_intval = sp->bintval; 295170530Ssam ise->se_capinfo = sp->capinfo; 296195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 297195618Srpaulo if (sp->meshid != NULL && sp->meshid[1] != 0) 298195618Srpaulo memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 299195618Srpaulo#endif 300173368Ssam /* 301173368Ssam * Beware of overriding se_chan for frames seen 302173368Ssam * off-channel; this can cause us to attempt an 303178354Ssam * association on the wrong channel. 304173368Ssam */ 305178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 306173368Ssam /* 307173862Ssam * Off-channel, locate the home/bss channel for the sta 308178354Ssam * using the value broadcast in the DSPARMS ie. We know 309178354Ssam * sp->chan has this value because it's used to calculate 310178354Ssam * IEEE80211_BPARSE_OFFCHAN. 311173368Ssam */ 312178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 313178354Ssam ic->ic_curchan->ic_flags); 314173956Ssam if (c != NULL) { 315173956Ssam ise->se_chan = c; 316173956Ssam } else if (ise->se_chan == NULL) { 317173862Ssam /* should not happen, pick something */ 318178354Ssam ise->se_chan = ic->ic_curchan; 319173862Ssam } 320173862Ssam } else 321178354Ssam ise->se_chan = ic->ic_curchan; 322224717Sbschmidt if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 323224717Sbschmidt /* Demote legacy networks to a non-HT channel. */ 324224717Sbschmidt c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 325224717Sbschmidt ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 326224717Sbschmidt KASSERT(c != NULL, 327224717Sbschmidt ("no legacy channel %u", ise->se_chan->ic_ieee)); 328224717Sbschmidt ise->se_chan = c; 329224717Sbschmidt } 330170530Ssam ise->se_fhdwell = sp->fhdwell; 331170530Ssam ise->se_fhindex = sp->fhindex; 332170530Ssam ise->se_erp = sp->erp; 333170530Ssam ise->se_timoff = sp->timoff; 334170530Ssam if (sp->tim != NULL) { 335170530Ssam const struct ieee80211_tim_ie *tim = 336170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 337170530Ssam ise->se_dtimperiod = tim->tim_period; 338170530Ssam } 339178354Ssam if (sp->country != NULL) { 340178354Ssam const struct ieee80211_country_ie *cie = 341178354Ssam (const struct ieee80211_country_ie *) sp->country; 342178354Ssam /* 343178354Ssam * If 11d is enabled and we're attempting to join a bss 344178354Ssam * that advertises it's country code then compare our 345178354Ssam * current settings to what we fetched from the country ie. 346178354Ssam * If our country code is unspecified or different then 347178354Ssam * dispatch an event to user space that identifies the 348178354Ssam * country code so our regdomain config can be changed. 349178354Ssam */ 350178354Ssam /* XXX only for STA mode? */ 351178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 352178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 353178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 354178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 355178354Ssam /* only issue one notify event per scan */ 356178354Ssam if (se->se_countrygen != st->st_scangen) { 357178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 358178354Ssam cie->cc); 359178354Ssam se->se_countrygen = st->st_scangen; 360178354Ssam } 361178354Ssam } 362178354Ssam ise->se_cc[0] = cie->cc[0]; 363178354Ssam ise->se_cc[1] = cie->cc[1]; 364178354Ssam } 365178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 366178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 367170530Ssam 368170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 369170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 370170530Ssam se->se_fails = 0; 371178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 372170530Ssam "%s: fails %u", __func__, se->se_fails); 373170530Ssam } 374170530Ssam 375170530Ssam se->se_lastupdate = ticks; /* update time */ 376170530Ssam se->se_seen = 1; 377170530Ssam se->se_notseen = 0; 378170530Ssam 379186107Ssam KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 380178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 381178354Ssam st->st_maxrssi[sp->bchan] = rssi; 382178354Ssam 383206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 384170530Ssam 385170530Ssam /* 386170530Ssam * If looking for a quick choice and nothing's 387170530Ssam * been found check here. 388170530Ssam */ 389178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 390170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 391170530Ssam 392170530Ssam return 1; 393170530Ssam#undef PICK1ST 394170530Ssam#undef ISPROBE 395170530Ssam} 396170530Ssam 397170530Ssam/* 398170530Ssam * Check if a channel is excluded by user request. 399170530Ssam */ 400170530Ssamstatic int 401178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 402170530Ssam{ 403178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 404178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 405178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 406170530Ssam} 407170530Ssam 408170530Ssamstatic struct ieee80211_channel * 409170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 410170530Ssam{ 411170530Ssam struct ieee80211_channel *c; 412170530Ssam int j; 413170530Ssam 414170530Ssam /* 415170530Ssam * The normal ordering in the channel list is b channel 416170530Ssam * immediately followed by g so optimize the search for 417170530Ssam * this. We'll still do a full search just in case. 418170530Ssam */ 419170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 420170530Ssam c = &ic->ic_channels[j]; 421187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 422170530Ssam return c; 423170530Ssam } 424170530Ssam for (j = 0; j < i; j++) { 425170530Ssam c = &ic->ic_channels[j]; 426187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 427170530Ssam return c; 428170530Ssam } 429170530Ssam return NULL; 430170530Ssam} 431188777Ssam 432170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 433188777Ssam [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 434188777Ssam [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 435188777Ssam [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 436188777Ssam [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 437188777Ssam [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 438188777Ssam /* check base channel */ 439188777Ssam [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 440188777Ssam [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 441188777Ssam [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 442188782Ssam [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 443188782Ssam [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 444188777Ssam /* check legacy */ 445188777Ssam [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 446188777Ssam [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 447170530Ssam}; 448170530Ssam 449170530Ssamstatic void 450178354Ssamadd_channels(struct ieee80211vap *vap, 451170530Ssam struct ieee80211_scan_state *ss, 452170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 453170530Ssam{ 454178354Ssam struct ieee80211com *ic = vap->iv_ic; 455170530Ssam struct ieee80211_channel *c, *cg; 456170530Ssam u_int modeflags; 457170530Ssam int i; 458170530Ssam 459254315Srpaulo KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 460170530Ssam modeflags = chanflags[mode]; 461170530Ssam for (i = 0; i < nfreq; i++) { 462170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 463170530Ssam break; 464170530Ssam 465170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 466178354Ssam if (c == NULL || isexcluded(vap, c)) 467170530Ssam continue; 468170530Ssam if (mode == IEEE80211_MODE_AUTO) { 469170530Ssam /* 470170530Ssam * XXX special-case 11b/g channels so we select 471178354Ssam * the g channel if both are present. 472170530Ssam */ 473178354Ssam if (IEEE80211_IS_CHAN_B(c) && 474178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 475178354Ssam c = cg; 476170530Ssam } 477170530Ssam ss->ss_chans[ss->ss_last++] = c; 478170530Ssam } 479170530Ssam} 480170530Ssam 481170530Ssamstruct scanlist { 482170530Ssam uint16_t mode; 483170530Ssam uint16_t count; 484170530Ssam const uint16_t *list; 485170530Ssam}; 486170530Ssam 487170530Ssamstatic int 488170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 489170530Ssam{ 490170530Ssam int i; 491170530Ssam 492170530Ssam for (; scan->list != NULL; scan++) { 493170530Ssam for (i = 0; i < scan->count; i++) 494170530Ssam if (scan->list[i] == c->ic_freq) 495170530Ssam return 1; 496170530Ssam } 497170530Ssam return 0; 498170530Ssam} 499170530Ssam 500189377Ssamstatic int 501189377Ssamonscanlist(const struct ieee80211_scan_state *ss, 502189377Ssam const struct ieee80211_channel *c) 503189377Ssam{ 504189377Ssam int i; 505189377Ssam 506189377Ssam for (i = 0; i < ss->ss_last; i++) 507189377Ssam if (ss->ss_chans[i] == c) 508189377Ssam return 1; 509189377Ssam return 0; 510189377Ssam} 511189377Ssam 512176653Ssamstatic void 513178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 514176653Ssam const struct scanlist table[]) 515176653Ssam{ 516178354Ssam struct ieee80211com *ic = vap->iv_ic; 517176653Ssam struct ieee80211_channel *c; 518176653Ssam int i; 519176653Ssam 520176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 521176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 522176653Ssam break; 523176653Ssam 524176653Ssam c = &ic->ic_channels[i]; 525176653Ssam /* 526176653Ssam * Ignore dynamic turbo channels; we scan them 527176653Ssam * in normal mode (i.e. not boosted). Likewise 528176653Ssam * for HT channels, they get scanned using 529176653Ssam * legacy rates. 530176653Ssam */ 531176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 532176653Ssam continue; 533176653Ssam 534176653Ssam /* 535176653Ssam * If a desired mode was specified, scan only 536176653Ssam * channels that satisfy that constraint. 537176653Ssam */ 538178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 539178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 540176653Ssam continue; 541176653Ssam 542176653Ssam /* 543176653Ssam * Skip channels excluded by user request. 544176653Ssam */ 545178354Ssam if (isexcluded(vap, c)) 546176653Ssam continue; 547176653Ssam 548176653Ssam /* 549176653Ssam * Add the channel unless it is listed in the 550176653Ssam * fixed scan order tables. This insures we 551176653Ssam * don't sweep back in channels we filtered out 552176653Ssam * above. 553176653Ssam */ 554176653Ssam if (checktable(table, c)) 555176653Ssam continue; 556176653Ssam 557176653Ssam /* Add channel to scanning list. */ 558176653Ssam ss->ss_chans[ss->ss_last++] = c; 559176653Ssam } 560189377Ssam /* 561189377Ssam * Explicitly add any desired channel if: 562189377Ssam * - not already on the scan list 563189377Ssam * - allowed by any desired mode constraint 564189377Ssam * - there is space in the scan list 565189377Ssam * This allows the channel to be used when the filtering 566189377Ssam * mechanisms would otherwise elide it (e.g HT, turbo). 567189377Ssam */ 568189377Ssam c = vap->iv_des_chan; 569189377Ssam if (c != IEEE80211_CHAN_ANYC && 570189377Ssam !onscanlist(ss, c) && 571189377Ssam (vap->iv_des_mode == IEEE80211_MODE_AUTO || 572189377Ssam vap->iv_des_mode == ieee80211_chan2mode(c)) && 573189377Ssam ss->ss_last < IEEE80211_SCAN_MAX) 574189377Ssam ss->ss_chans[ss->ss_last++] = c; 575176653Ssam} 576176653Ssam 577178354Ssamstatic void 578178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 579178354Ssam const struct scanlist table[]) 580170530Ssam{ 581170530Ssam const struct scanlist *scan; 582170530Ssam enum ieee80211_phymode mode; 583170530Ssam 584170530Ssam ss->ss_last = 0; 585170530Ssam /* 586170530Ssam * Use the table of ordered channels to construct the list 587170530Ssam * of channels for scanning. Any channels in the ordered 588170530Ssam * list not in the master list will be discarded. 589170530Ssam */ 590178354Ssam for (scan = table; scan->list != NULL; scan++) { 591170530Ssam mode = scan->mode; 592178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 593170530Ssam /* 594170530Ssam * If a desired mode was specified, scan only 595170530Ssam * channels that satisfy that constraint. 596170530Ssam */ 597178354Ssam if (vap->iv_des_mode != mode) { 598170530Ssam /* 599170530Ssam * The scan table marks 2.4Ghz channels as b 600170530Ssam * so if the desired mode is 11g, then use 601170530Ssam * the 11b channel list but upgrade the mode. 602170530Ssam */ 603275875Sadrian if (vap->iv_des_mode == IEEE80211_MODE_11G) { 604275875Sadrian if (mode == IEEE80211_MODE_11G) /* Skip the G check */ 605275875Sadrian continue; 606275875Sadrian else if (mode == IEEE80211_MODE_11B) 607275875Sadrian mode = IEEE80211_MODE_11G; /* upgrade */ 608275875Sadrian } 609170530Ssam } 610170530Ssam } else { 611170530Ssam /* 612170530Ssam * This lets add_channels upgrade an 11b channel 613170530Ssam * to 11g if available. 614170530Ssam */ 615170530Ssam if (mode == IEEE80211_MODE_11B) 616170530Ssam mode = IEEE80211_MODE_AUTO; 617170530Ssam } 618170530Ssam#ifdef IEEE80211_F_XR 619170530Ssam /* XR does not operate on turbo channels */ 620178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 621170530Ssam (mode == IEEE80211_MODE_TURBO_A || 622170530Ssam mode == IEEE80211_MODE_TURBO_G || 623170530Ssam mode == IEEE80211_MODE_STURBO_A)) 624170530Ssam continue; 625170530Ssam#endif 626170530Ssam /* 627170530Ssam * Add the list of the channels; any that are not 628170530Ssam * in the master channel list will be discarded. 629170530Ssam */ 630178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 631170530Ssam } 632170530Ssam 633170530Ssam /* 634178354Ssam * Add the channels from the ic that are not present 635178354Ssam * in the table. 636170530Ssam */ 637178354Ssam sweepchannels(ss, vap, table); 638178354Ssam} 639170530Ssam 640178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 641178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 642178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 643178354Ssam{ 5170, 5190, 5210, 5230 }; 644178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 645178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 646178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 647178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 648178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 649178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 650178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 651178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 652178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 653178354Ssam{ 2484 }; 654178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 655178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 656178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 657178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 658178354Ssam#ifdef ATH_TURBO_SCAN 659178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 660178354Ssam{ 5210, 5250, 5290 }; 661178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 662178354Ssam{ 5760, 5800 }; 663178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 664178354Ssam{ 5540, 5580, 5620, 5660 }; 665178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 666178354Ssam{ 2437 }; 667178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 668178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 669178354Ssam#endif /* ATH_TURBO_SCAN */ 670170530Ssam 671178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 672170530Ssam 673178354Ssamstatic const struct scanlist staScanTable[] = { 674178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 675178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 676178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 677178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 678178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 679178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 680178354Ssam#ifdef ATH_TURBO_SCAN 681178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 682178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 683178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 684178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 685178354Ssam#endif /* ATH_TURBO_SCAN */ 686178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 687178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 688178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 689178354Ssam#ifdef ATH_TURBO_SCAN 690178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 691178354Ssam#endif /* ATH_TURBO_SCAN */ 692178354Ssam { .list = NULL } 693178354Ssam}; 694178354Ssam 695178354Ssam/* 696178354Ssam * Start a station-mode scan by populating the channel list. 697178354Ssam */ 698178354Ssamstatic int 699178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 700178354Ssam{ 701178354Ssam struct sta_table *st = ss->ss_priv; 702178354Ssam 703178354Ssam makescanlist(ss, vap, staScanTable); 704178354Ssam 705178354Ssam if (ss->ss_mindwell == 0) 706178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 707178354Ssam if (ss->ss_maxdwell == 0) 708178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 709178354Ssam 710178354Ssam st->st_scangen++; 711170530Ssam st->st_newscan = 1; 712170530Ssam 713170530Ssam return 0; 714170530Ssam} 715170530Ssam 716170530Ssam/* 717178354Ssam * Restart a scan, typically a bg scan but can 718178354Ssam * also be a fg scan that came up empty. 719170530Ssam */ 720170530Ssamstatic int 721178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 722170530Ssam{ 723170530Ssam struct sta_table *st = ss->ss_priv; 724170530Ssam 725170530Ssam st->st_newscan = 1; 726170530Ssam return 0; 727170530Ssam} 728170530Ssam 729170530Ssam/* 730170530Ssam * Cancel an ongoing scan. 731170530Ssam */ 732170530Ssamstatic int 733178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 734170530Ssam{ 735170530Ssam return 0; 736170530Ssam} 737170530Ssam 738258736Srpaulo/* unaligned little endian access */ 739178354Ssam#define LE_READ_2(p) \ 740178354Ssam ((uint16_t) \ 741178354Ssam ((((const uint8_t *)(p))[0] ) | \ 742178354Ssam (((const uint8_t *)(p))[1] << 8))) 743184302Ssam 744184302Ssam/* 745184302Ssam * Demote any supplied 11g channel to 11b. There should 746184302Ssam * always be an 11b channel but we check anyway... 747184302Ssam */ 748184302Ssamstatic struct ieee80211_channel * 749184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 750184302Ssam{ 751184302Ssam struct ieee80211_channel *c; 752178354Ssam 753184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 754184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 755184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 756184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 757184302Ssam IEEE80211_CHAN_B); 758184302Ssam if (c != NULL) 759184302Ssam chan = c; 760184302Ssam } 761184302Ssam return chan; 762184302Ssam} 763184302Ssam 764178354Ssamstatic int 765170530Ssammaxrate(const struct ieee80211_scan_entry *se) 766170530Ssam{ 767178354Ssam const struct ieee80211_ie_htcap *htcap = 768178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 769219601Sbschmidt int rmax, r, i, txstream; 770178354Ssam uint16_t caps; 771219601Sbschmidt uint8_t txparams; 772170530Ssam 773170530Ssam rmax = 0; 774178354Ssam if (htcap != NULL) { 775178354Ssam /* 776178354Ssam * HT station; inspect supported MCS and then adjust 777219601Sbschmidt * rate by channel width. 778178354Ssam */ 779219601Sbschmidt txparams = htcap->hc_mcsset[12]; 780219601Sbschmidt if (txparams & 0x3) { 781219601Sbschmidt /* 782219601Sbschmidt * TX MCS parameters defined and not equal to RX, 783219601Sbschmidt * extract the number of spartial streams and 784219601Sbschmidt * map it to the highest MCS rate. 785219601Sbschmidt */ 786219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 787219601Sbschmidt i = txstream * 8 - 1; 788219601Sbschmidt } else 789219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 790178354Ssam if (i >= 0) { 791178354Ssam caps = LE_READ_2(&htcap->hc_cap); 792219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 793219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 794178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 795219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 796219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 797219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 798219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 799178354Ssam else 800219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 801178354Ssam } 802178354Ssam } 803170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 804170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 805170530Ssam if (r > rmax) 806170530Ssam rmax = r; 807170530Ssam } 808170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 809170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 810170530Ssam if (r > rmax) 811170530Ssam rmax = r; 812170530Ssam } 813170530Ssam return rmax; 814170530Ssam} 815170530Ssam 816170530Ssam/* 817170530Ssam * Compare the capabilities of two entries and decide which is 818170530Ssam * more desirable (return >0 if a is considered better). Note 819170530Ssam * that we assume compatibility/usability has already been checked 820170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 821170530Ssam * Used to select the best scan candidate for association in a BSS. 822170530Ssam */ 823170530Ssamstatic int 824170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 825170530Ssam{ 826170530Ssam#define PREFER(_a,_b,_what) do { \ 827170530Ssam if (((_a) ^ (_b)) & (_what)) \ 828170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 829170530Ssam} while (0) 830178354Ssam int maxa, maxb; 831170530Ssam int8_t rssia, rssib; 832170530Ssam int weight; 833170530Ssam 834170530Ssam /* privacy support */ 835170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 836170530Ssam IEEE80211_CAPINFO_PRIVACY); 837170530Ssam 838170530Ssam /* compare count of previous failures */ 839170530Ssam weight = b->se_fails - a->se_fails; 840170530Ssam if (abs(weight) > 1) 841170530Ssam return weight; 842170530Ssam 843170530Ssam /* 844170530Ssam * Compare rssi. If the two are considered equivalent 845170530Ssam * then fallback to other criteria. We threshold the 846170530Ssam * comparisons to avoid selecting an ap purely by rssi 847170530Ssam * when both values may be good but one ap is otherwise 848170530Ssam * more desirable (e.g. an 11b-only ap with stronger 849170530Ssam * signal than an 11g ap). 850170530Ssam */ 851170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 852170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 853170530Ssam if (abs(rssib - rssia) < 5) { 854170530Ssam /* best/max rate preferred if signal level close enough XXX */ 855170530Ssam maxa = maxrate(&a->base); 856170530Ssam maxb = maxrate(&b->base); 857170530Ssam if (maxa != maxb) 858170530Ssam return maxa - maxb; 859170530Ssam /* XXX use freq for channel preference */ 860170530Ssam /* for now just prefer 5Ghz band to all other bands */ 861178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 862178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 863170530Ssam } 864170530Ssam /* all things being equal, use signal level */ 865170530Ssam return a->base.se_rssi - b->base.se_rssi; 866170530Ssam#undef PREFER 867170530Ssam} 868170530Ssam 869170530Ssam/* 870170530Ssam * Check rate set suitability and return the best supported rate. 871178354Ssam * XXX inspect MCS for HT 872170530Ssam */ 873170530Ssamstatic int 874184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 875184302Ssam const struct ieee80211_scan_entry *se) 876170530Ssam{ 877170530Ssam#define RV(v) ((v) & IEEE80211_RATE_VAL) 878170530Ssam const struct ieee80211_rateset *srs; 879178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 880170530Ssam const uint8_t *rs; 881170530Ssam 882178354Ssam okrate = badrate = 0; 883170530Ssam 884184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 885170530Ssam nrs = se->se_rates[1]; 886170530Ssam rs = se->se_rates+2; 887178354Ssam /* XXX MCS */ 888184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 889170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 890170530Ssamagain: 891170530Ssam for (i = 0; i < nrs; i++) { 892170530Ssam r = RV(rs[i]); 893170530Ssam badrate = r; 894170530Ssam /* 895170530Ssam * Check any fixed rate is included. 896170530Ssam */ 897178354Ssam if (r == ucastrate) 898170530Ssam fixedrate = r; 899170530Ssam /* 900170530Ssam * Check against our supported rates. 901170530Ssam */ 902170530Ssam for (j = 0; j < srs->rs_nrates; j++) 903170530Ssam if (r == RV(srs->rs_rates[j])) { 904170530Ssam if (r > okrate) /* NB: track max */ 905170530Ssam okrate = r; 906170530Ssam break; 907170530Ssam } 908170530Ssam 909170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 910170530Ssam /* 911170530Ssam * Don't try joining a BSS, if we don't support 912170530Ssam * one of its basic rates. 913170530Ssam */ 914170530Ssam okrate = 0; 915170530Ssam goto back; 916170530Ssam } 917170530Ssam } 918170530Ssam if (rs == se->se_rates+2) { 919170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 920170530Ssam nrs = se->se_xrates[1]; 921170530Ssam rs = se->se_xrates+2; 922170530Ssam goto again; 923170530Ssam } 924170530Ssam 925170530Ssamback: 926178354Ssam if (okrate == 0 || ucastrate != fixedrate) 927170530Ssam return badrate | IEEE80211_RATE_BASIC; 928170530Ssam else 929170530Ssam return RV(okrate); 930170530Ssam#undef RV 931170530Ssam} 932170530Ssam 933195618Srpaulostatic __inline int 934195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 935195618Srpaulo{ 936195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 937195618Srpaulo} 938195618Srpaulo 939170530Ssamstatic int 940170530Ssammatch_ssid(const uint8_t *ie, 941170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 942170530Ssam{ 943170530Ssam int i; 944170530Ssam 945170530Ssam for (i = 0; i < nssid; i++) { 946195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 947170530Ssam return 1; 948170530Ssam } 949170530Ssam return 0; 950170530Ssam} 951170530Ssam 952186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 953186904Ssamstatic int 954186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 955186904Ssam{ 956186904Ssam int slot, slotcnt; 957186904Ssam 958186904Ssam slotcnt = tdma->tdma_slotcnt; 959186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 960186904Ssam if (isclr(tdma->tdma_inuse, slot)) 961186904Ssam return 0; 962186904Ssam return 1; 963186904Ssam} 964186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 965186904Ssam 966170530Ssam/* 967170530Ssam * Test a scan candidate for suitability/compatibility. 968170530Ssam */ 969170530Ssamstatic int 970178354Ssammatch_bss(struct ieee80211vap *vap, 971170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 972170530Ssam int debug) 973170530Ssam{ 974178354Ssam struct ieee80211com *ic = vap->iv_ic; 975170530Ssam struct ieee80211_scan_entry *se = &se0->base; 976178354Ssam uint8_t rate; 977178354Ssam int fail; 978170530Ssam 979170530Ssam fail = 0; 980170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 981171409Ssam fail |= MATCH_CHANNEL; 982170530Ssam /* 983170530Ssam * NB: normally the desired mode is used to construct 984170530Ssam * the channel list, but it's possible for the scan 985170530Ssam * cache to include entries for stations outside this 986170530Ssam * list so we check the desired mode here to weed them 987170530Ssam * out. 988170530Ssam */ 989178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 990170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 991178354Ssam chanflags[vap->iv_des_mode]) 992171409Ssam fail |= MATCH_CHANNEL; 993178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 994170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 995171409Ssam fail |= MATCH_CAPINFO; 996186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 997186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 998186904Ssam /* 999186904Ssam * Adhoc demo network setup shouldn't really be scanning 1000186904Ssam * but just in case skip stations operating in IBSS or 1001186904Ssam * BSS mode. 1002186904Ssam */ 1003186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1004186904Ssam fail |= MATCH_CAPINFO; 1005186904Ssam /* 1006186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1007186904Ssam * skip if IBSS or ESS capabilities are marked and require 1008186904Ssam * the beacon have a TDMA ie present. 1009186904Ssam */ 1010186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1011186904Ssam const struct ieee80211_tdma_param *tdma = 1012186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1013189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1014186904Ssam 1015186904Ssam if (tdma == NULL) 1016186904Ssam fail |= MATCH_TDMA_NOIE; 1017189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1018189980Ssam fail |= MATCH_TDMA_VERSION; 1019186904Ssam else if (tdma->tdma_slot != 0) 1020186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1021186904Ssam else if (tdma_isfull(tdma)) 1022186904Ssam fail |= MATCH_TDMA_NOSLOT; 1023186904Ssam#if 0 1024186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1025186904Ssam fail |= MATCH_TDMA_LOCAL; 1026186904Ssam#endif 1027186904Ssam } 1028186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1029195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1030195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1031195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1032195618Srpaulo /* 1033195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1034195618Srpaulo * and two special ie's that must be present. 1035195618Srpaulo */ 1036195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1037195618Srpaulo fail |= MATCH_CAPINFO; 1038215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1039195618Srpaulo fail |= MATCH_MESH_NOID; 1040195618Srpaulo else if (ms->ms_idlen != 0 && 1041195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1042195618Srpaulo fail |= MATCH_MESHID; 1043196005Ssam#endif 1044170530Ssam } else { 1045170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1046171409Ssam fail |= MATCH_CAPINFO; 1047178354Ssam /* 1048178354Ssam * If 11d is enabled and we're attempting to join a bss 1049178354Ssam * that advertises it's country code then compare our 1050178354Ssam * current settings to what we fetched from the country ie. 1051178354Ssam * If our country code is unspecified or different then do 1052178354Ssam * not attempt to join the bss. We should have already 1053178354Ssam * dispatched an event to user space that identifies the 1054178354Ssam * new country code so our regdomain config should match. 1055178354Ssam */ 1056178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1057178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1058178354Ssam se->se_cc[0] != 0 && 1059178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1060178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1061178354Ssam fail |= MATCH_CC; 1062170530Ssam } 1063178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1064170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1065171409Ssam fail |= MATCH_PRIVACY; 1066170530Ssam } else { 1067170530Ssam /* XXX does this mean privacy is supported or required? */ 1068170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1069171409Ssam fail |= MATCH_PRIVACY; 1070170530Ssam } 1071184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1072184302Ssam rate = check_rate(vap, se->se_chan, se); 1073184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1074171409Ssam fail |= MATCH_RATE; 1075184302Ssam /* 1076184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1077184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1078184302Ssam * in the scan list to 11b and retry the rate check. 1079184302Ssam */ 1080184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1081184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1082184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1083184302Ssam fail &= ~MATCH_RATE; 1084184302Ssam se0->se_flags |= STA_DEMOTE11B; 1085184302Ssam } 1086184302Ssam } 1087184302Ssam } else if (rate < 2*24) { 1088184302Ssam /* 1089184302Ssam * This is an 11b-only ap. Check the desired mode in 1090184302Ssam * case that needs to be honored (mode 11g filters out 1091184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1092184302Ssam * in scanning to be demoted. 1093184302Ssam * 1094184302Ssam * NB: we cheat a bit here by looking at the max rate; 1095184302Ssam * we could/should check the rates. 1096184302Ssam */ 1097184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1098184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1099184302Ssam fail |= MATCH_RATE; 1100184302Ssam else 1101184302Ssam se0->se_flags |= STA_DEMOTE11B; 1102184302Ssam } 1103170530Ssam if (ss->ss_nssid != 0 && 1104171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1105171409Ssam fail |= MATCH_SSID; 1106178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1107178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1108178354Ssam fail |= MATCH_BSSID; 1109170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1110171409Ssam fail |= MATCH_FAILS; 1111170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1112171409Ssam fail |= MATCH_NOTSEEN; 1113170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1114171409Ssam fail |= MATCH_RSSI; 1115170530Ssam#ifdef IEEE80211_DEBUG 1116178354Ssam if (ieee80211_msg(vap, debug)) { 1117170530Ssam printf(" %c %s", 1118171409Ssam fail & MATCH_FAILS ? '=' : 1119171409Ssam fail & MATCH_NOTSEEN ? '^' : 1120178354Ssam fail & MATCH_CC ? '$' : 1121186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1122186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1123189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1124189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1125189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1126189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1127186904Ssam#endif 1128195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1129171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1130170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1131171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1132170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1133171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1134171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1135170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1136171409Ssam fail & MATCH_RATE ? '!' : ' '); 1137170530Ssam printf(" %4s%c", 1138170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1139189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1140171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1141170530Ssam printf(" %3s%c ", 1142170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1143170530Ssam "wep" : "no", 1144171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1145170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1146195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1147170530Ssam } 1148170530Ssam#endif 1149170530Ssam return fail; 1150170530Ssam} 1151170530Ssam 1152170530Ssamstatic void 1153170530Ssamsta_update_notseen(struct sta_table *st) 1154170530Ssam{ 1155170530Ssam struct sta_entry *se; 1156170530Ssam 1157206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1158170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1159170530Ssam /* 1160170530Ssam * If seen the reset and don't bump the count; 1161170530Ssam * otherwise bump the ``not seen'' count. Note 1162170530Ssam * that this insures that stations for which we 1163170530Ssam * see frames while not scanning but not during 1164170530Ssam * this scan will not be penalized. 1165170530Ssam */ 1166170530Ssam if (se->se_seen) 1167170530Ssam se->se_seen = 0; 1168170530Ssam else 1169170530Ssam se->se_notseen++; 1170170530Ssam } 1171206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1172170530Ssam} 1173170530Ssam 1174170530Ssamstatic void 1175170530Ssamsta_dec_fails(struct sta_table *st) 1176170530Ssam{ 1177170530Ssam struct sta_entry *se; 1178170530Ssam 1179206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1180170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1181170530Ssam if (se->se_fails) 1182170530Ssam se->se_fails--; 1183206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1184170530Ssam} 1185170530Ssam 1186170530Ssamstatic struct sta_entry * 1187178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1188170530Ssam{ 1189170530Ssam struct sta_table *st = ss->ss_priv; 1190170530Ssam struct sta_entry *se, *selbs = NULL; 1191170530Ssam 1192178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1193170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1194206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1195170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1196184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1197178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1198170530Ssam if (selbs == NULL) 1199170530Ssam selbs = se; 1200170530Ssam else if (sta_compare(se, selbs) > 0) 1201170530Ssam selbs = se; 1202170530Ssam } 1203170530Ssam } 1204206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1205170530Ssam 1206170530Ssam return selbs; 1207170530Ssam} 1208170530Ssam 1209170530Ssam/* 1210170530Ssam * Pick an ap or ibss network to join or find a channel 1211170530Ssam * to use to start an ibss network. 1212170530Ssam */ 1213170530Ssamstatic int 1214178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1215170530Ssam{ 1216170530Ssam struct sta_table *st = ss->ss_priv; 1217170530Ssam struct sta_entry *selbs; 1218184274Ssam struct ieee80211_channel *chan; 1219170530Ssam 1220178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1221178354Ssam ("wrong mode %u", vap->iv_opmode)); 1222170530Ssam 1223170530Ssam if (st->st_newscan) { 1224170530Ssam sta_update_notseen(st); 1225170530Ssam st->st_newscan = 0; 1226170530Ssam } 1227170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1228170530Ssam /* 1229170530Ssam * Manual/background scan, don't select+join the 1230170530Ssam * bss, just return. The scanning framework will 1231170530Ssam * handle notification that this has completed. 1232170530Ssam */ 1233170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1234170530Ssam return 1; 1235170530Ssam } 1236170530Ssam /* 1237170530Ssam * Automatic sequencing; look for a candidate and 1238170530Ssam * if found join the network. 1239170530Ssam */ 1240170530Ssam /* NB: unlocked read should be ok */ 1241170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1242178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1243170530Ssam "%s: no scan candidate\n", __func__); 1244178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1245178354Ssam return 0; 1246170530Ssamnotfound: 1247170530Ssam /* 1248170530Ssam * If nothing suitable was found decrement 1249170530Ssam * the failure counts so entries will be 1250170530Ssam * reconsidered the next time around. We 1251170530Ssam * really want to do this only for sta's 1252170530Ssam * where we've previously had some success. 1253170530Ssam */ 1254170530Ssam sta_dec_fails(st); 1255170530Ssam st->st_newscan = 1; 1256170530Ssam return 0; /* restart scan */ 1257170530Ssam } 1258178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1259178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1260178354Ssam return (selbs != NULL); 1261184274Ssam if (selbs == NULL) 1262170530Ssam goto notfound; 1263184274Ssam chan = selbs->base.se_chan; 1264184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1265184302Ssam chan = demote11b(vap, chan); 1266184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1267184274Ssam goto notfound; 1268170530Ssam return 1; /* terminate scan */ 1269170530Ssam} 1270170530Ssam 1271170530Ssam/* 1272170530Ssam * Lookup an entry in the scan cache. We assume we're 1273170530Ssam * called from the bottom half or such that we don't need 1274170530Ssam * to block the bottom half so that it's safe to return 1275170530Ssam * a reference to an entry w/o holding the lock on the table. 1276170530Ssam */ 1277170530Ssamstatic struct sta_entry * 1278170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1279170530Ssam{ 1280170530Ssam struct sta_entry *se; 1281170530Ssam int hash = STA_HASH(macaddr); 1282170530Ssam 1283206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1284170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1285170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1286170530Ssam break; 1287206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1288170530Ssam 1289170530Ssam return se; /* NB: unlocked */ 1290170530Ssam} 1291170530Ssam 1292170530Ssamstatic void 1293178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1294170530Ssam{ 1295178354Ssam struct ieee80211com *ic = vap->iv_ic; 1296178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1297170530Ssam struct sta_table *st = ss->ss_priv; 1298178354Ssam enum ieee80211_phymode mode; 1299170530Ssam struct sta_entry *se, *selbs; 1300178354Ssam uint8_t roamRate, curRate, ucastRate; 1301170530Ssam int8_t roamRssi, curRssi; 1302170530Ssam 1303170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1304170530Ssam if (se == NULL) { 1305170530Ssam /* XXX something is wrong */ 1306170530Ssam return; 1307170530Ssam } 1308170530Ssam 1309178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1310178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1311178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1312178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1313170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1314170530Ssam curRssi = ic->ic_node_getrssi(ni); 1315178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1316178354Ssam curRate = ni->ni_txrate; 1317178354Ssam roamRate &= IEEE80211_RATE_VAL; 1318178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1319170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1320170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1321170530Ssam } else { 1322170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1323178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1324170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1325170530Ssam } 1326170530Ssam /* 1327170530Ssam * Check if a new ap should be used and switch. 1328170530Ssam * XXX deauth current ap 1329170530Ssam */ 1330170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1331178354Ssam if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1332170530Ssam /* 1333170530Ssam * Scan cache contents are too old; force a scan now 1334170530Ssam * if possible so we have current state to make a 1335170530Ssam * decision with. We don't kick off a bg scan if 1336170530Ssam * we're using dynamic turbo and boosted or if the 1337170530Ssam * channel is busy. 1338170530Ssam * XXX force immediate switch on scan complete 1339170530Ssam */ 1340170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1341178354Ssam time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1342178354Ssam ieee80211_bg_scan(vap, 0); 1343170530Ssam return; 1344170530Ssam } 1345170530Ssam se->base.se_rssi = curRssi; 1346178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1347170530Ssam if (selbs != NULL && selbs != se) { 1348184274Ssam struct ieee80211_channel *chan; 1349184274Ssam 1350178354Ssam IEEE80211_DPRINTF(vap, 1351170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1352170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1353170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1354170530Ssam curRate, roamRate, curRssi, roamRssi); 1355184274Ssam 1356184274Ssam chan = selbs->base.se_chan; 1357184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1358184302Ssam chan = demote11b(vap, chan); 1359184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1360170530Ssam } 1361170530Ssam } 1362170530Ssam} 1363170530Ssam 1364170530Ssam/* 1365170530Ssam * Age entries in the scan cache. 1366170530Ssam * XXX also do roaming since it's convenient 1367170530Ssam */ 1368170530Ssamstatic void 1369170530Ssamsta_age(struct ieee80211_scan_state *ss) 1370170530Ssam{ 1371178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1372170530Ssam 1373178354Ssam adhoc_age(ss); 1374170530Ssam /* 1375170530Ssam * If rate control is enabled check periodically to see if 1376170530Ssam * we should roam from our current connection to one that 1377170530Ssam * might be better. This only applies when we're operating 1378170530Ssam * in sta mode and automatic roaming is set. 1379170530Ssam * XXX defer if busy 1380170530Ssam * XXX repeater station 1381170530Ssam * XXX do when !bgscan? 1382170530Ssam */ 1383178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1384178354Ssam ("wrong mode %u", vap->iv_opmode)); 1385178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1386213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1387178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1388170530Ssam /* XXX vap is implicit */ 1389178354Ssam sta_roam_check(ss, vap); 1390170530Ssam} 1391170530Ssam 1392170530Ssam/* 1393170530Ssam * Iterate over the entries in the scan cache, invoking 1394170530Ssam * the callback function on each one. 1395170530Ssam */ 1396170530Ssamstatic void 1397170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1398170530Ssam ieee80211_scan_iter_func *f, void *arg) 1399170530Ssam{ 1400170530Ssam struct sta_table *st = ss->ss_priv; 1401170530Ssam struct sta_entry *se; 1402170530Ssam u_int gen; 1403170530Ssam 1404170530Ssam mtx_lock(&st->st_scanlock); 1405178354Ssam gen = st->st_scaniter++; 1406170530Ssamrestart: 1407206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1408170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1409170530Ssam if (se->se_scangen != gen) { 1410170530Ssam se->se_scangen = gen; 1411170530Ssam /* update public state */ 1412170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1413206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1414170530Ssam (*f)(arg, &se->base); 1415170530Ssam goto restart; 1416170530Ssam } 1417170530Ssam } 1418206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1419170530Ssam 1420170530Ssam mtx_unlock(&st->st_scanlock); 1421170530Ssam} 1422170530Ssam 1423170530Ssamstatic void 1424170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1425170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1426170530Ssam{ 1427170530Ssam struct sta_table *st = ss->ss_priv; 1428170530Ssam struct sta_entry *se; 1429170530Ssam 1430170530Ssam se = sta_lookup(st, macaddr); 1431170530Ssam if (se != NULL) { 1432170530Ssam se->se_fails++; 1433170530Ssam se->se_lastfail = ticks; 1434178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1435170530Ssam macaddr, "%s: reason %u fails %u", 1436170530Ssam __func__, reason, se->se_fails); 1437170530Ssam } 1438170530Ssam} 1439170530Ssam 1440170530Ssamstatic void 1441170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1442170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1443170530Ssam{ 1444170530Ssam struct sta_table *st = ss->ss_priv; 1445170530Ssam struct sta_entry *se; 1446170530Ssam 1447170530Ssam se = sta_lookup(st, macaddr); 1448170530Ssam if (se != NULL) { 1449170530Ssam#if 0 1450170530Ssam se->se_fails = 0; 1451178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1452170530Ssam macaddr, "%s: fails %u", 1453170530Ssam __func__, se->se_fails); 1454170530Ssam#endif 1455170530Ssam se->se_lastassoc = ticks; 1456170530Ssam } 1457170530Ssam} 1458170530Ssam 1459170530Ssamstatic const struct ieee80211_scanner sta_default = { 1460170530Ssam .scan_name = "default", 1461170530Ssam .scan_attach = sta_attach, 1462170530Ssam .scan_detach = sta_detach, 1463170530Ssam .scan_start = sta_start, 1464170530Ssam .scan_restart = sta_restart, 1465170530Ssam .scan_cancel = sta_cancel, 1466170530Ssam .scan_end = sta_pick_bss, 1467170530Ssam .scan_flush = sta_flush, 1468170530Ssam .scan_add = sta_add, 1469170530Ssam .scan_age = sta_age, 1470170530Ssam .scan_iterate = sta_iterate, 1471170530Ssam .scan_assoc_fail = sta_assoc_fail, 1472170530Ssam .scan_assoc_success = sta_assoc_success, 1473170530Ssam}; 1474195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1475170530Ssam 1476170530Ssam/* 1477170530Ssam * Adhoc mode-specific support. 1478170530Ssam */ 1479170530Ssam 1480170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1481170530Ssam{ 5180, 5200, 5220, 5240 }; 1482170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1483170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1484170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1485170530Ssam{ 5170, 5190, 5210, 5230 }; 1486170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1487170530Ssam{ 2457, 2462 }; 1488170530Ssam 1489170530Ssamstatic const struct scanlist adhocScanTable[] = { 1490170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1491170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1492170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1493170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1494170530Ssam { .list = NULL } 1495170530Ssam}; 1496170530Ssam#undef X 1497170530Ssam 1498170530Ssam/* 1499170530Ssam * Start an adhoc-mode scan by populating the channel list. 1500170530Ssam */ 1501170530Ssamstatic int 1502178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1503170530Ssam{ 1504170530Ssam struct sta_table *st = ss->ss_priv; 1505170530Ssam 1506178354Ssam makescanlist(ss, vap, adhocScanTable); 1507176653Ssam 1508178354Ssam if (ss->ss_mindwell == 0) 1509178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1510178354Ssam if (ss->ss_maxdwell == 0) 1511178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1512176653Ssam 1513178354Ssam st->st_scangen++; 1514170530Ssam st->st_newscan = 1; 1515170530Ssam 1516170530Ssam return 0; 1517170530Ssam} 1518170530Ssam 1519170530Ssam/* 1520170530Ssam * Select a channel to start an adhoc network on. 1521170530Ssam * The channel list was populated with appropriate 1522170530Ssam * channels so select one that looks least occupied. 1523170530Ssam */ 1524170530Ssamstatic struct ieee80211_channel * 1525178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1526170530Ssam{ 1527170530Ssam struct sta_table *st = ss->ss_priv; 1528170530Ssam struct sta_entry *se; 1529170530Ssam struct ieee80211_channel *c, *bestchan; 1530170530Ssam int i, bestrssi, maxrssi; 1531170530Ssam 1532170530Ssam bestchan = NULL; 1533170530Ssam bestrssi = -1; 1534170530Ssam 1535206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1536170530Ssam for (i = 0; i < ss->ss_last; i++) { 1537170530Ssam c = ss->ss_chans[i]; 1538178354Ssam /* never consider a channel with radar */ 1539178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1540176653Ssam continue; 1541178354Ssam /* skip channels disallowed by regulatory settings */ 1542178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1543178354Ssam continue; 1544178354Ssam /* check channel attributes for band compatibility */ 1545178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1546178354Ssam continue; 1547170530Ssam maxrssi = 0; 1548170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1549170530Ssam if (se->base.se_chan != c) 1550170530Ssam continue; 1551170530Ssam if (se->base.se_rssi > maxrssi) 1552170530Ssam maxrssi = se->base.se_rssi; 1553170530Ssam } 1554170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1555170530Ssam bestchan = c; 1556170530Ssam } 1557206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1558170530Ssam 1559170530Ssam return bestchan; 1560170530Ssam} 1561170530Ssam 1562170530Ssam/* 1563170530Ssam * Pick an ibss network to join or find a channel 1564170530Ssam * to use to start an ibss network. 1565170530Ssam */ 1566170530Ssamstatic int 1567178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1568170530Ssam{ 1569170530Ssam struct sta_table *st = ss->ss_priv; 1570170530Ssam struct sta_entry *selbs; 1571170530Ssam struct ieee80211_channel *chan; 1572245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1573170530Ssam 1574178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1575195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1576195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1577178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1578170530Ssam 1579170530Ssam if (st->st_newscan) { 1580170530Ssam sta_update_notseen(st); 1581170530Ssam st->st_newscan = 0; 1582170530Ssam } 1583170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1584170530Ssam /* 1585170530Ssam * Manual/background scan, don't select+join the 1586170530Ssam * bss, just return. The scanning framework will 1587170530Ssam * handle notification that this has completed. 1588170530Ssam */ 1589170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1590170530Ssam return 1; 1591170530Ssam } 1592170530Ssam /* 1593170530Ssam * Automatic sequencing; look for a candidate and 1594170530Ssam * if found join the network. 1595170530Ssam */ 1596170530Ssam /* NB: unlocked read should be ok */ 1597170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1598178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1599170530Ssam "%s: no scan candidate\n", __func__); 1600178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1601178354Ssam return 0; 1602170530Ssamnotfound: 1603186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1604186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1605186904Ssam if (vap->iv_des_nssid && 1606186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1607186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1608186904Ssam#else 1609178354Ssam if (vap->iv_des_nssid) { 1610186904Ssam#endif 1611170530Ssam /* 1612170530Ssam * No existing adhoc network to join and we have 1613170530Ssam * an ssid; start one up. If no channel was 1614170530Ssam * specified, try to select a channel. 1615170530Ssam */ 1616178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1617178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1618183421Ssam chan = adhoc_pick_channel(ss, 0); 1619178354Ssam } else 1620178354Ssam chan = vap->iv_des_chan; 1621170530Ssam if (chan != NULL) { 1622245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1623245928Sadrian /* 1624245928Sadrian * Create a HT capable IBSS; the per-node 1625245928Sadrian * probe request/response will result in 1626245928Sadrian * "correct" rate control capabilities being 1627245928Sadrian * negotiated. 1628245928Sadrian */ 1629245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1630245928Sadrian chan, vap->iv_flags_ht); 1631178354Ssam ieee80211_create_ibss(vap, chan); 1632170530Ssam return 1; 1633170530Ssam } 1634170530Ssam } 1635170530Ssam /* 1636170530Ssam * If nothing suitable was found decrement 1637170530Ssam * the failure counts so entries will be 1638170530Ssam * reconsidered the next time around. We 1639170530Ssam * really want to do this only for sta's 1640170530Ssam * where we've previously had some success. 1641170530Ssam */ 1642170530Ssam sta_dec_fails(st); 1643170530Ssam st->st_newscan = 1; 1644170530Ssam return 0; /* restart scan */ 1645170530Ssam } 1646178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1647178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1648178354Ssam return (selbs != NULL); 1649184274Ssam if (selbs == NULL) 1650170530Ssam goto notfound; 1651184274Ssam chan = selbs->base.se_chan; 1652184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1653184302Ssam chan = demote11b(vap, chan); 1654245928Sadrian /* 1655245928Sadrian * If HT is available, make it a possibility here. 1656245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1657245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1658245928Sadrian * to any subsequent nodes that support it. 1659245928Sadrian */ 1660245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1661245928Sadrian chan, vap->iv_flags_ht); 1662184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1663184274Ssam goto notfound; 1664170530Ssam return 1; /* terminate scan */ 1665170530Ssam} 1666170530Ssam 1667170530Ssam/* 1668170530Ssam * Age entries in the scan cache. 1669170530Ssam */ 1670170530Ssamstatic void 1671170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1672170530Ssam{ 1673170530Ssam struct sta_table *st = ss->ss_priv; 1674170530Ssam struct sta_entry *se, *next; 1675170530Ssam 1676206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1677170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1678170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1679170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1680170530Ssam LIST_REMOVE(se, se_hash); 1681178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1682186302Ssam free(se, M_80211_SCAN); 1683170530Ssam } 1684170530Ssam } 1685206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1686170530Ssam} 1687170530Ssam 1688170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1689170530Ssam .scan_name = "default", 1690170530Ssam .scan_attach = sta_attach, 1691170530Ssam .scan_detach = sta_detach, 1692170530Ssam .scan_start = adhoc_start, 1693170530Ssam .scan_restart = sta_restart, 1694170530Ssam .scan_cancel = sta_cancel, 1695170530Ssam .scan_end = adhoc_pick_bss, 1696170530Ssam .scan_flush = sta_flush, 1697178354Ssam .scan_pickchan = adhoc_pick_channel, 1698170530Ssam .scan_add = sta_add, 1699170530Ssam .scan_age = adhoc_age, 1700170530Ssam .scan_iterate = sta_iterate, 1701170530Ssam .scan_assoc_fail = sta_assoc_fail, 1702170530Ssam .scan_assoc_success = sta_assoc_success, 1703170530Ssam}; 1704195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1705195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1706170530Ssam 1707178354Ssamstatic void 1708178354Ssamap_force_promisc(struct ieee80211com *ic) 1709178354Ssam{ 1710178354Ssam struct ifnet *ifp = ic->ic_ifp; 1711178354Ssam 1712178354Ssam IEEE80211_LOCK(ic); 1713178354Ssam /* set interface into promiscuous mode */ 1714178354Ssam ifp->if_flags |= IFF_PROMISC; 1715191746Sthompsa ieee80211_runtask(ic, &ic->ic_promisc_task); 1716178354Ssam IEEE80211_UNLOCK(ic); 1717178354Ssam} 1718178354Ssam 1719178354Ssamstatic void 1720178354Ssamap_reset_promisc(struct ieee80211com *ic) 1721178354Ssam{ 1722178354Ssam IEEE80211_LOCK(ic); 1723178354Ssam ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1724178354Ssam IEEE80211_UNLOCK(ic); 1725178354Ssam} 1726178354Ssam 1727178354Ssamstatic int 1728178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1729178354Ssam{ 1730178354Ssam struct sta_table *st = ss->ss_priv; 1731178354Ssam 1732178354Ssam makescanlist(ss, vap, staScanTable); 1733178354Ssam 1734178354Ssam if (ss->ss_mindwell == 0) 1735178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1736178354Ssam if (ss->ss_maxdwell == 0) 1737178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1738178354Ssam 1739178354Ssam st->st_scangen++; 1740178354Ssam st->st_newscan = 1; 1741178354Ssam 1742178354Ssam ap_force_promisc(vap->iv_ic); 1743178354Ssam return 0; 1744178354Ssam} 1745178354Ssam 1746170530Ssam/* 1747178354Ssam * Cancel an ongoing scan. 1748170530Ssam */ 1749170530Ssamstatic int 1750178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1751170530Ssam{ 1752178354Ssam ap_reset_promisc(vap->iv_ic); 1753178354Ssam return 0; 1754178354Ssam} 1755178354Ssam 1756178354Ssam/* 1757178354Ssam * Pick a quiet channel to use for ap operation. 1758178354Ssam */ 1759178354Ssamstatic struct ieee80211_channel * 1760178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1761178354Ssam{ 1762178354Ssam struct sta_table *st = ss->ss_priv; 1763178354Ssam struct ieee80211_channel *bestchan = NULL; 1764178354Ssam int i; 1765178354Ssam 1766178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1767178354Ssam /* NB: use scan list order to preserve channel preference */ 1768178354Ssam for (i = 0; i < ss->ss_last; i++) { 1769178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1770178354Ssam /* 1771178354Ssam * If the channel is unoccupied the max rssi 1772178354Ssam * should be zero; just take it. Otherwise 1773178354Ssam * track the channel with the lowest rssi and 1774178354Ssam * use that when all channels appear occupied. 1775178354Ssam */ 1776178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1777178354Ssam continue; 1778178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1779178354Ssam continue; 1780178354Ssam /* check channel attributes for band compatibility */ 1781178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1782178354Ssam continue; 1783186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1784178354Ssam /* XXX channel have interference */ 1785178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1786178354Ssam /* XXX use other considerations */ 1787178354Ssam return chan; 1788170530Ssam } 1789178354Ssam if (bestchan == NULL || 1790178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1791178354Ssam bestchan = chan; 1792178354Ssam } 1793178354Ssam return bestchan; 1794178354Ssam} 1795178354Ssam 1796178354Ssam/* 1797178354Ssam * Pick a quiet channel to use for ap operation. 1798178354Ssam */ 1799178354Ssamstatic int 1800178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1801178354Ssam{ 1802178354Ssam struct ieee80211com *ic = vap->iv_ic; 1803178354Ssam struct ieee80211_channel *bestchan; 1804178354Ssam 1805178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1806178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1807178354Ssam bestchan = ap_pick_channel(ss, 0); 1808178354Ssam if (bestchan == NULL) { 1809178354Ssam /* no suitable channel, should not happen */ 1810178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1811178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1812178354Ssam /* XXX print something? */ 1813178354Ssam return 0; /* restart scan */ 1814178354Ssam } 1815178354Ssam /* 1816178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1817178354Ssam */ 1818178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1819178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1820178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1821178354Ssam if (bestchan == NULL) { 1822178354Ssam /* should never happen ?? */ 1823178354Ssam return 0; 1824170530Ssam } 1825170530Ssam } 1826178354Ssam ap_reset_promisc(ic); 1827178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1828178354Ssam /* 1829178354Ssam * Manual/background scan, don't select+join the 1830178354Ssam * bss, just return. The scanning framework will 1831178354Ssam * handle notification that this has completed. 1832178354Ssam */ 1833178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1834178354Ssam return 1; 1835178354Ssam } 1836178354Ssam ieee80211_create_ibss(vap, 1837193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1838178354Ssam return 1; 1839170530Ssam} 1840170530Ssam 1841178354Ssamstatic const struct ieee80211_scanner ap_default = { 1842178354Ssam .scan_name = "default", 1843178354Ssam .scan_attach = sta_attach, 1844178354Ssam .scan_detach = sta_detach, 1845178354Ssam .scan_start = ap_start, 1846178354Ssam .scan_restart = sta_restart, 1847178354Ssam .scan_cancel = ap_cancel, 1848178354Ssam .scan_end = ap_end, 1849178354Ssam .scan_flush = sta_flush, 1850178354Ssam .scan_pickchan = ap_pick_channel, 1851178354Ssam .scan_add = sta_add, 1852178354Ssam .scan_age = adhoc_age, 1853178354Ssam .scan_iterate = sta_iterate, 1854178354Ssam .scan_assoc_success = sta_assoc_success, 1855178354Ssam .scan_assoc_fail = sta_assoc_fail, 1856170530Ssam}; 1857195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1858178354Ssam 1859195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1860178354Ssam/* 1861195618Srpaulo * Pick an mbss network to join or find a channel 1862195618Srpaulo * to use to start an mbss network. 1863178354Ssam */ 1864195618Srpaulostatic int 1865195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1866195618Srpaulo{ 1867195618Srpaulo struct sta_table *st = ss->ss_priv; 1868195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1869195618Srpaulo struct sta_entry *selbs; 1870195618Srpaulo struct ieee80211_channel *chan; 1871195618Srpaulo 1872195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1873195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1874195618Srpaulo 1875195618Srpaulo if (st->st_newscan) { 1876195618Srpaulo sta_update_notseen(st); 1877195618Srpaulo st->st_newscan = 0; 1878195618Srpaulo } 1879195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1880195618Srpaulo /* 1881195618Srpaulo * Manual/background scan, don't select+join the 1882195618Srpaulo * bss, just return. The scanning framework will 1883195618Srpaulo * handle notification that this has completed. 1884195618Srpaulo */ 1885195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1886195618Srpaulo return 1; 1887195618Srpaulo } 1888195618Srpaulo /* 1889195618Srpaulo * Automatic sequencing; look for a candidate and 1890195618Srpaulo * if found join the network. 1891195618Srpaulo */ 1892195618Srpaulo /* NB: unlocked read should be ok */ 1893195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1894195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1895195618Srpaulo "%s: no scan candidate\n", __func__); 1896195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1897195618Srpaulo return 0; 1898195618Srpaulonotfound: 1899195618Srpaulo if (ms->ms_idlen != 0) { 1900195618Srpaulo /* 1901195618Srpaulo * No existing mbss network to join and we have 1902195618Srpaulo * a meshid; start one up. If no channel was 1903195618Srpaulo * specified, try to select a channel. 1904195618Srpaulo */ 1905195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1906195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1907195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1908195618Srpaulo 1909195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1910195618Srpaulo if (chan != NULL) 1911195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1912195618Srpaulo chan, vap->iv_flags_ht); 1913195618Srpaulo } else 1914195618Srpaulo chan = vap->iv_des_chan; 1915195618Srpaulo if (chan != NULL) { 1916195618Srpaulo ieee80211_create_ibss(vap, chan); 1917195618Srpaulo return 1; 1918195618Srpaulo } 1919195618Srpaulo } 1920195618Srpaulo /* 1921195618Srpaulo * If nothing suitable was found decrement 1922195618Srpaulo * the failure counts so entries will be 1923195618Srpaulo * reconsidered the next time around. We 1924195618Srpaulo * really want to do this only for sta's 1925195618Srpaulo * where we've previously had some success. 1926195618Srpaulo */ 1927195618Srpaulo sta_dec_fails(st); 1928195618Srpaulo st->st_newscan = 1; 1929195618Srpaulo return 0; /* restart scan */ 1930195618Srpaulo } 1931195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1932195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1933195618Srpaulo return (selbs != NULL); 1934195618Srpaulo if (selbs == NULL) 1935195618Srpaulo goto notfound; 1936195618Srpaulo chan = selbs->base.se_chan; 1937195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1938195618Srpaulo chan = demote11b(vap, chan); 1939195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1940195618Srpaulo goto notfound; 1941195618Srpaulo return 1; /* terminate scan */ 1942195618Srpaulo} 1943195618Srpaulo 1944195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1945195618Srpaulo .scan_name = "default", 1946195618Srpaulo .scan_attach = sta_attach, 1947195618Srpaulo .scan_detach = sta_detach, 1948195618Srpaulo .scan_start = adhoc_start, 1949195618Srpaulo .scan_restart = sta_restart, 1950195618Srpaulo .scan_cancel = sta_cancel, 1951195618Srpaulo .scan_end = mesh_pick_bss, 1952195618Srpaulo .scan_flush = sta_flush, 1953195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1954195618Srpaulo .scan_add = sta_add, 1955195618Srpaulo .scan_age = adhoc_age, 1956195618Srpaulo .scan_iterate = sta_iterate, 1957195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1958195618Srpaulo .scan_assoc_success = sta_assoc_success, 1959195618Srpaulo}; 1960195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1961195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1962