1170530Ssam/*- 2186904Ssam * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3170530Ssam * All rights reserved. 4170530Ssam * 5170530Ssam * Redistribution and use in source and binary forms, with or without 6170530Ssam * modification, are permitted provided that the following conditions 7170530Ssam * are met: 8170530Ssam * 1. Redistributions of source code must retain the above copyright 9170530Ssam * notice, this list of conditions and the following disclaimer. 10170530Ssam * 2. Redistributions in binary form must reproduce the above copyright 11170530Ssam * notice, this list of conditions and the following disclaimer in the 12170530Ssam * documentation and/or other materials provided with the distribution. 13170530Ssam * 14170530Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15170530Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16170530Ssam * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17170530Ssam * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18170530Ssam * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19170530Ssam * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20170530Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21170530Ssam * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22170530Ssam * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23170530Ssam * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24170530Ssam */ 25170530Ssam 26170530Ssam#include <sys/cdefs.h> 27170530Ssam__FBSDID("$FreeBSD: stable/10/sys/net80211/ieee80211_scan_sta.c 343818 2019-02-06 01:53:01Z avos $"); 28170530Ssam 29170530Ssam/* 30170530Ssam * IEEE 802.11 station scanning support. 31170530Ssam */ 32178354Ssam#include "opt_wlan.h" 33178354Ssam 34170530Ssam#include <sys/param.h> 35191746Sthompsa#include <sys/systm.h> 36170530Ssam#include <sys/kernel.h> 37170530Ssam#include <sys/module.h> 38191746Sthompsa 39170530Ssam#include <sys/socket.h> 40170530Ssam 41170530Ssam#include <net/if.h> 42170530Ssam#include <net/if_media.h> 43170530Ssam#include <net/ethernet.h> 44170530Ssam 45170530Ssam#include <net80211/ieee80211_var.h> 46178354Ssam#include <net80211/ieee80211_input.h> 47178354Ssam#include <net80211/ieee80211_regdomain.h> 48186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 49186904Ssam#include <net80211/ieee80211_tdma.h> 50186904Ssam#endif 51195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 52195618Srpaulo#include <net80211/ieee80211_mesh.h> 53195618Srpaulo#endif 54245928Sadrian#include <net80211/ieee80211_ratectl.h> 55170530Ssam 56170530Ssam#include <net/bpf.h> 57170530Ssam 58170530Ssam/* 59170530Ssam * Parameters for managing cache entries: 60170530Ssam * 61170530Ssam * o a station with STA_FAILS_MAX failures is not considered 62170530Ssam * when picking a candidate 63170530Ssam * o a station that hasn't had an update in STA_PURGE_SCANS 64170530Ssam * (background) scans is discarded 65170530Ssam * o after STA_FAILS_AGE seconds we clear the failure count 66170530Ssam */ 67170530Ssam#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 68170530Ssam#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 69170530Ssam#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 70170530Ssam 71170530Ssam/* XXX tunable */ 72170530Ssam#define STA_RSSI_MIN 8 /* min acceptable rssi */ 73170530Ssam#define STA_RSSI_MAX 40 /* max rssi for comparison */ 74170530Ssam 75170530Ssamstruct sta_entry { 76170530Ssam struct ieee80211_scan_entry base; 77170530Ssam TAILQ_ENTRY(sta_entry) se_list; 78170530Ssam LIST_ENTRY(sta_entry) se_hash; 79170530Ssam uint8_t se_fails; /* failure to associate count */ 80170530Ssam uint8_t se_seen; /* seen during current scan */ 81170530Ssam uint8_t se_notseen; /* not seen in previous scans */ 82170530Ssam uint8_t se_flags; 83184302Ssam#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 84170530Ssam uint32_t se_avgrssi; /* LPF rssi state */ 85170530Ssam unsigned long se_lastupdate; /* time of last update */ 86170530Ssam unsigned long se_lastfail; /* time of last failure */ 87170530Ssam unsigned long se_lastassoc; /* time of last association */ 88170530Ssam u_int se_scangen; /* iterator scan gen# */ 89178354Ssam u_int se_countrygen; /* gen# of last cc notify */ 90170530Ssam}; 91170530Ssam 92170530Ssam#define STA_HASHSIZE 32 93170530Ssam/* simple hash is enough for variation of macaddr */ 94170530Ssam#define STA_HASH(addr) \ 95170530Ssam (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 96170530Ssam 97186107Ssam#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 98186107SsamCTASSERT(MAX_IEEE_CHAN >= 256); 99186107Ssam 100170530Ssamstruct sta_table { 101206617Srpaulo ieee80211_scan_table_lock_t st_lock; /* on scan table */ 102170530Ssam TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 103170530Ssam LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 104178354Ssam struct mtx st_scanlock; /* on st_scaniter */ 105178354Ssam u_int st_scaniter; /* gen# for iterator */ 106178354Ssam u_int st_scangen; /* scan generation # */ 107170530Ssam int st_newscan; 108178354Ssam /* ap-related state */ 109186107Ssam int st_maxrssi[MAX_IEEE_CHAN]; 110170530Ssam}; 111170530Ssam 112170530Ssamstatic void sta_flush_table(struct sta_table *); 113171409Ssam/* 114171409Ssam * match_bss returns a bitmask describing if an entry is suitable 115171409Ssam * for use. If non-zero the entry was deemed not suitable and it's 116171409Ssam * contents explains why. The following flags are or'd to to this 117171409Ssam * mask and can be used to figure out why the entry was rejected. 118171409Ssam */ 119195618Srpaulo#define MATCH_CHANNEL 0x00001 /* channel mismatch */ 120195618Srpaulo#define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 121195618Srpaulo#define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 122195618Srpaulo#define MATCH_RATE 0x00008 /* rate set mismatch */ 123195618Srpaulo#define MATCH_SSID 0x00010 /* ssid mismatch */ 124195618Srpaulo#define MATCH_BSSID 0x00020 /* bssid mismatch */ 125195618Srpaulo#define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 126195618Srpaulo#define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 127195618Srpaulo#define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 128195618Srpaulo#define MATCH_CC 0x00200 /* country code mismatch */ 129195618Srpaulo#define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 130195618Srpaulo#define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 131195618Srpaulo#define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 132195618Srpaulo#define MATCH_TDMA_LOCAL 0x02000 /* local address */ 133195618Srpaulo#define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 134195618Srpaulo#define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 135195618Srpaulo#define MATCH_MESHID 0x20000 /* meshid mismatch */ 136178354Ssamstatic int match_bss(struct ieee80211vap *, 137170530Ssam const struct ieee80211_scan_state *, struct sta_entry *, int); 138178354Ssamstatic void adhoc_age(struct ieee80211_scan_state *); 139170530Ssam 140178354Ssamstatic __inline int 141178354Ssamisocmp(const uint8_t cc1[], const uint8_t cc2[]) 142178354Ssam{ 143178354Ssam return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 144178354Ssam} 145178354Ssam 146170530Ssam/* number of references from net80211 layer */ 147170530Ssamstatic int nrefs = 0; 148195618Srpaulo/* 149195618Srpaulo * Module glue. 150195618Srpaulo */ 151195618SrpauloIEEE80211_SCANNER_MODULE(sta, 1); 152170530Ssam 153170530Ssam/* 154170530Ssam * Attach prior to any scanning work. 155170530Ssam */ 156170530Ssamstatic int 157170530Ssamsta_attach(struct ieee80211_scan_state *ss) 158170530Ssam{ 159170530Ssam struct sta_table *st; 160170530Ssam 161186302Ssam st = (struct sta_table *) malloc(sizeof(struct sta_table), 162170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 163170530Ssam if (st == NULL) 164170530Ssam return 0; 165206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 166170530Ssam mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 167170530Ssam TAILQ_INIT(&st->st_entry); 168170530Ssam ss->ss_priv = st; 169170530Ssam nrefs++; /* NB: we assume caller locking */ 170170530Ssam return 1; 171170530Ssam} 172170530Ssam 173170530Ssam/* 174170530Ssam * Cleanup any private state. 175170530Ssam */ 176170530Ssamstatic int 177170530Ssamsta_detach(struct ieee80211_scan_state *ss) 178170530Ssam{ 179170530Ssam struct sta_table *st = ss->ss_priv; 180170530Ssam 181170530Ssam if (st != NULL) { 182170530Ssam sta_flush_table(st); 183206617Srpaulo IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 184170530Ssam mtx_destroy(&st->st_scanlock); 185186302Ssam free(st, M_80211_SCAN); 186170530Ssam KASSERT(nrefs > 0, ("imbalanced attach/detach")); 187170530Ssam nrefs--; /* NB: we assume caller locking */ 188170530Ssam } 189170530Ssam return 1; 190170530Ssam} 191170530Ssam 192170530Ssam/* 193170530Ssam * Flush all per-scan state. 194170530Ssam */ 195170530Ssamstatic int 196170530Ssamsta_flush(struct ieee80211_scan_state *ss) 197170530Ssam{ 198170530Ssam struct sta_table *st = ss->ss_priv; 199170530Ssam 200206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 201170530Ssam sta_flush_table(st); 202206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 203170530Ssam ss->ss_last = 0; 204170530Ssam return 0; 205170530Ssam} 206170530Ssam 207170530Ssam/* 208170530Ssam * Flush all entries in the scan cache. 209170530Ssam */ 210170530Ssamstatic void 211170530Ssamsta_flush_table(struct sta_table *st) 212170530Ssam{ 213170530Ssam struct sta_entry *se, *next; 214170530Ssam 215170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 216170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 217170530Ssam LIST_REMOVE(se, se_hash); 218178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 219186302Ssam free(se, M_80211_SCAN); 220170530Ssam } 221178354Ssam memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 222170530Ssam} 223170530Ssam 224170530Ssam/* 225170530Ssam * Process a beacon or probe response frame; create an 226170530Ssam * entry in the scan cache or update any previous entry. 227170530Ssam */ 228170530Ssamstatic int 229170530Ssamsta_add(struct ieee80211_scan_state *ss, 230170530Ssam const struct ieee80211_scanparams *sp, 231170530Ssam const struct ieee80211_frame *wh, 232192468Ssam int subtype, int rssi, int noise) 233170530Ssam{ 234170530Ssam#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 235170530Ssam#define PICK1ST(_ss) \ 236170530Ssam ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 237170530Ssam IEEE80211_SCAN_PICK1ST) 238170530Ssam struct sta_table *st = ss->ss_priv; 239170530Ssam const uint8_t *macaddr = wh->i_addr2; 240178354Ssam struct ieee80211vap *vap = ss->ss_vap; 241178354Ssam struct ieee80211com *ic = vap->iv_ic; 242224717Sbschmidt struct ieee80211_channel *c; 243170530Ssam struct sta_entry *se; 244170530Ssam struct ieee80211_scan_entry *ise; 245178354Ssam int hash; 246170530Ssam 247170530Ssam hash = STA_HASH(macaddr); 248170530Ssam 249206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 250170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 251170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 252170530Ssam goto found; 253186302Ssam se = (struct sta_entry *) malloc(sizeof(struct sta_entry), 254170530Ssam M_80211_SCAN, M_NOWAIT | M_ZERO); 255170530Ssam if (se == NULL) { 256206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 257170530Ssam return 0; 258170530Ssam } 259178354Ssam se->se_scangen = st->st_scaniter-1; 260178354Ssam se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 261170530Ssam IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 262170530Ssam TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 263170530Ssam LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 264170530Ssamfound: 265170530Ssam ise = &se->base; 266170530Ssam /* XXX ap beaconing multiple ssid w/ same bssid */ 267170530Ssam if (sp->ssid[1] != 0 && 268170530Ssam (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 269170530Ssam memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 270170530Ssam KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 271170530Ssam ("rate set too large: %u", sp->rates[1])); 272170530Ssam memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 273170530Ssam if (sp->xrates != NULL) { 274170530Ssam /* XXX validate xrates[1] */ 275178354Ssam KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 276170530Ssam ("xrate set too large: %u", sp->xrates[1])); 277170530Ssam memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 278170530Ssam } else 279170530Ssam ise->se_xrates[1] = 0; 280170530Ssam IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 281178354Ssam if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 282173368Ssam /* 283173368Ssam * Record rssi data using extended precision LPF filter. 284173368Ssam * 285173368Ssam * NB: use only on-channel data to insure we get a good 286173368Ssam * estimate of the signal we'll see when associated. 287173368Ssam */ 288178354Ssam IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 289178354Ssam ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 290173368Ssam ise->se_noise = noise; 291173368Ssam } 292170530Ssam memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 293170530Ssam ise->se_intval = sp->bintval; 294170530Ssam ise->se_capinfo = sp->capinfo; 295195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 296195618Srpaulo if (sp->meshid != NULL && sp->meshid[1] != 0) 297195618Srpaulo memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 298195618Srpaulo#endif 299173368Ssam /* 300173368Ssam * Beware of overriding se_chan for frames seen 301173368Ssam * off-channel; this can cause us to attempt an 302178354Ssam * association on the wrong channel. 303173368Ssam */ 304178354Ssam if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 305173368Ssam /* 306173862Ssam * Off-channel, locate the home/bss channel for the sta 307178354Ssam * using the value broadcast in the DSPARMS ie. We know 308178354Ssam * sp->chan has this value because it's used to calculate 309178354Ssam * IEEE80211_BPARSE_OFFCHAN. 310173368Ssam */ 311178354Ssam c = ieee80211_find_channel_byieee(ic, sp->chan, 312178354Ssam ic->ic_curchan->ic_flags); 313173956Ssam if (c != NULL) { 314173956Ssam ise->se_chan = c; 315173956Ssam } else if (ise->se_chan == NULL) { 316173862Ssam /* should not happen, pick something */ 317178354Ssam ise->se_chan = ic->ic_curchan; 318173862Ssam } 319173862Ssam } else 320178354Ssam ise->se_chan = ic->ic_curchan; 321224717Sbschmidt if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 322224717Sbschmidt /* Demote legacy networks to a non-HT channel. */ 323224717Sbschmidt c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 324224717Sbschmidt ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 325224717Sbschmidt KASSERT(c != NULL, 326224717Sbschmidt ("no legacy channel %u", ise->se_chan->ic_ieee)); 327224717Sbschmidt ise->se_chan = c; 328224717Sbschmidt } 329170530Ssam ise->se_fhdwell = sp->fhdwell; 330170530Ssam ise->se_fhindex = sp->fhindex; 331170530Ssam ise->se_erp = sp->erp; 332170530Ssam ise->se_timoff = sp->timoff; 333170530Ssam if (sp->tim != NULL) { 334170530Ssam const struct ieee80211_tim_ie *tim = 335170530Ssam (const struct ieee80211_tim_ie *) sp->tim; 336170530Ssam ise->se_dtimperiod = tim->tim_period; 337170530Ssam } 338178354Ssam if (sp->country != NULL) { 339178354Ssam const struct ieee80211_country_ie *cie = 340178354Ssam (const struct ieee80211_country_ie *) sp->country; 341178354Ssam /* 342178354Ssam * If 11d is enabled and we're attempting to join a bss 343178354Ssam * that advertises it's country code then compare our 344178354Ssam * current settings to what we fetched from the country ie. 345178354Ssam * If our country code is unspecified or different then 346178354Ssam * dispatch an event to user space that identifies the 347178354Ssam * country code so our regdomain config can be changed. 348178354Ssam */ 349178354Ssam /* XXX only for STA mode? */ 350178354Ssam if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 351178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 352178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 353178354Ssam !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 354178354Ssam /* only issue one notify event per scan */ 355178354Ssam if (se->se_countrygen != st->st_scangen) { 356178354Ssam ieee80211_notify_country(vap, ise->se_bssid, 357178354Ssam cie->cc); 358178354Ssam se->se_countrygen = st->st_scangen; 359178354Ssam } 360178354Ssam } 361178354Ssam ise->se_cc[0] = cie->cc[0]; 362178354Ssam ise->se_cc[1] = cie->cc[1]; 363178354Ssam } 364178354Ssam /* NB: no need to setup ie ptrs; they are not (currently) used */ 365178354Ssam (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 366170530Ssam 367170530Ssam /* clear failure count after STA_FAIL_AGE passes */ 368170530Ssam if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 369170530Ssam se->se_fails = 0; 370178354Ssam IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 371170530Ssam "%s: fails %u", __func__, se->se_fails); 372170530Ssam } 373170530Ssam 374170530Ssam se->se_lastupdate = ticks; /* update time */ 375170530Ssam se->se_seen = 1; 376170530Ssam se->se_notseen = 0; 377170530Ssam 378186107Ssam KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 379178354Ssam if (rssi > st->st_maxrssi[sp->bchan]) 380178354Ssam st->st_maxrssi[sp->bchan] = rssi; 381178354Ssam 382206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 383170530Ssam 384170530Ssam /* 385170530Ssam * If looking for a quick choice and nothing's 386170530Ssam * been found check here. 387170530Ssam */ 388178354Ssam if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 389170530Ssam ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 390170530Ssam 391170530Ssam return 1; 392170530Ssam#undef PICK1ST 393170530Ssam#undef ISPROBE 394170530Ssam} 395170530Ssam 396170530Ssam/* 397170530Ssam * Check if a channel is excluded by user request. 398170530Ssam */ 399170530Ssamstatic int 400178354Ssamisexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 401170530Ssam{ 402178354Ssam return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 403178354Ssam (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 404178354Ssam c->ic_freq != vap->iv_des_chan->ic_freq)); 405170530Ssam} 406170530Ssam 407170530Ssamstatic struct ieee80211_channel * 408170530Ssamfind11gchannel(struct ieee80211com *ic, int i, int freq) 409170530Ssam{ 410170530Ssam struct ieee80211_channel *c; 411170530Ssam int j; 412170530Ssam 413170530Ssam /* 414170530Ssam * The normal ordering in the channel list is b channel 415170530Ssam * immediately followed by g so optimize the search for 416170530Ssam * this. We'll still do a full search just in case. 417170530Ssam */ 418170530Ssam for (j = i+1; j < ic->ic_nchans; j++) { 419170530Ssam c = &ic->ic_channels[j]; 420187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 421170530Ssam return c; 422170530Ssam } 423170530Ssam for (j = 0; j < i; j++) { 424170530Ssam c = &ic->ic_channels[j]; 425187991Ssam if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 426170530Ssam return c; 427170530Ssam } 428170530Ssam return NULL; 429170530Ssam} 430188777Ssam 431170530Ssamstatic const u_int chanflags[IEEE80211_MODE_MAX] = { 432188777Ssam [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 433188777Ssam [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 434188777Ssam [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 435188777Ssam [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 436188777Ssam [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 437188777Ssam /* check base channel */ 438188777Ssam [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 439188777Ssam [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 440188777Ssam [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 441188782Ssam [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 442188782Ssam [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 443188777Ssam /* check legacy */ 444188777Ssam [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 445188777Ssam [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 446170530Ssam}; 447170530Ssam 448170530Ssamstatic void 449178354Ssamadd_channels(struct ieee80211vap *vap, 450170530Ssam struct ieee80211_scan_state *ss, 451170530Ssam enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 452170530Ssam{ 453178354Ssam struct ieee80211com *ic = vap->iv_ic; 454170530Ssam struct ieee80211_channel *c, *cg; 455170530Ssam u_int modeflags; 456170530Ssam int i; 457170530Ssam 458254315Srpaulo KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 459170530Ssam modeflags = chanflags[mode]; 460170530Ssam for (i = 0; i < nfreq; i++) { 461170530Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 462170530Ssam break; 463170530Ssam 464170530Ssam c = ieee80211_find_channel(ic, freq[i], modeflags); 465178354Ssam if (c == NULL || isexcluded(vap, c)) 466170530Ssam continue; 467170530Ssam if (mode == IEEE80211_MODE_AUTO) { 468170530Ssam /* 469170530Ssam * XXX special-case 11b/g channels so we select 470178354Ssam * the g channel if both are present. 471170530Ssam */ 472178354Ssam if (IEEE80211_IS_CHAN_B(c) && 473178354Ssam (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 474178354Ssam c = cg; 475170530Ssam } 476170530Ssam ss->ss_chans[ss->ss_last++] = c; 477170530Ssam } 478170530Ssam} 479170530Ssam 480170530Ssamstruct scanlist { 481170530Ssam uint16_t mode; 482170530Ssam uint16_t count; 483170530Ssam const uint16_t *list; 484170530Ssam}; 485170530Ssam 486170530Ssamstatic int 487170530Ssamchecktable(const struct scanlist *scan, const struct ieee80211_channel *c) 488170530Ssam{ 489170530Ssam int i; 490170530Ssam 491170530Ssam for (; scan->list != NULL; scan++) { 492170530Ssam for (i = 0; i < scan->count; i++) 493170530Ssam if (scan->list[i] == c->ic_freq) 494170530Ssam return 1; 495170530Ssam } 496170530Ssam return 0; 497170530Ssam} 498170530Ssam 499189377Ssamstatic int 500189377Ssamonscanlist(const struct ieee80211_scan_state *ss, 501189377Ssam const struct ieee80211_channel *c) 502189377Ssam{ 503189377Ssam int i; 504189377Ssam 505189377Ssam for (i = 0; i < ss->ss_last; i++) 506189377Ssam if (ss->ss_chans[i] == c) 507189377Ssam return 1; 508189377Ssam return 0; 509189377Ssam} 510189377Ssam 511176653Ssamstatic void 512178354Ssamsweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 513176653Ssam const struct scanlist table[]) 514176653Ssam{ 515178354Ssam struct ieee80211com *ic = vap->iv_ic; 516176653Ssam struct ieee80211_channel *c; 517176653Ssam int i; 518176653Ssam 519176653Ssam for (i = 0; i < ic->ic_nchans; i++) { 520176653Ssam if (ss->ss_last >= IEEE80211_SCAN_MAX) 521176653Ssam break; 522176653Ssam 523176653Ssam c = &ic->ic_channels[i]; 524176653Ssam /* 525176653Ssam * Ignore dynamic turbo channels; we scan them 526176653Ssam * in normal mode (i.e. not boosted). Likewise 527176653Ssam * for HT channels, they get scanned using 528176653Ssam * legacy rates. 529176653Ssam */ 530176653Ssam if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 531176653Ssam continue; 532176653Ssam 533176653Ssam /* 534176653Ssam * If a desired mode was specified, scan only 535176653Ssam * channels that satisfy that constraint. 536176653Ssam */ 537178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 538178354Ssam vap->iv_des_mode != ieee80211_chan2mode(c)) 539176653Ssam continue; 540176653Ssam 541176653Ssam /* 542176653Ssam * Skip channels excluded by user request. 543176653Ssam */ 544178354Ssam if (isexcluded(vap, c)) 545176653Ssam continue; 546176653Ssam 547176653Ssam /* 548176653Ssam * Add the channel unless it is listed in the 549176653Ssam * fixed scan order tables. This insures we 550176653Ssam * don't sweep back in channels we filtered out 551176653Ssam * above. 552176653Ssam */ 553176653Ssam if (checktable(table, c)) 554176653Ssam continue; 555176653Ssam 556176653Ssam /* Add channel to scanning list. */ 557176653Ssam ss->ss_chans[ss->ss_last++] = c; 558176653Ssam } 559189377Ssam /* 560189377Ssam * Explicitly add any desired channel if: 561189377Ssam * - not already on the scan list 562189377Ssam * - allowed by any desired mode constraint 563189377Ssam * - there is space in the scan list 564189377Ssam * This allows the channel to be used when the filtering 565189377Ssam * mechanisms would otherwise elide it (e.g HT, turbo). 566189377Ssam */ 567189377Ssam c = vap->iv_des_chan; 568189377Ssam if (c != IEEE80211_CHAN_ANYC && 569189377Ssam !onscanlist(ss, c) && 570189377Ssam (vap->iv_des_mode == IEEE80211_MODE_AUTO || 571189377Ssam vap->iv_des_mode == ieee80211_chan2mode(c)) && 572189377Ssam ss->ss_last < IEEE80211_SCAN_MAX) 573189377Ssam ss->ss_chans[ss->ss_last++] = c; 574176653Ssam} 575176653Ssam 576178354Ssamstatic void 577178354Ssammakescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 578178354Ssam const struct scanlist table[]) 579170530Ssam{ 580170530Ssam const struct scanlist *scan; 581170530Ssam enum ieee80211_phymode mode; 582170530Ssam 583170530Ssam ss->ss_last = 0; 584170530Ssam /* 585170530Ssam * Use the table of ordered channels to construct the list 586170530Ssam * of channels for scanning. Any channels in the ordered 587170530Ssam * list not in the master list will be discarded. 588170530Ssam */ 589178354Ssam for (scan = table; scan->list != NULL; scan++) { 590170530Ssam mode = scan->mode; 591178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 592170530Ssam /* 593170530Ssam * If a desired mode was specified, scan only 594170530Ssam * channels that satisfy that constraint. 595170530Ssam */ 596178354Ssam if (vap->iv_des_mode != mode) { 597170530Ssam /* 598170530Ssam * The scan table marks 2.4Ghz channels as b 599170530Ssam * so if the desired mode is 11g, then use 600170530Ssam * the 11b channel list but upgrade the mode. 601170530Ssam */ 602178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_11G || 603170530Ssam mode != IEEE80211_MODE_11B) 604170530Ssam continue; 605170530Ssam mode = IEEE80211_MODE_11G; /* upgrade */ 606170530Ssam } 607170530Ssam } else { 608170530Ssam /* 609170530Ssam * This lets add_channels upgrade an 11b channel 610170530Ssam * to 11g if available. 611170530Ssam */ 612170530Ssam if (mode == IEEE80211_MODE_11B) 613170530Ssam mode = IEEE80211_MODE_AUTO; 614170530Ssam } 615170530Ssam#ifdef IEEE80211_F_XR 616170530Ssam /* XR does not operate on turbo channels */ 617178354Ssam if ((vap->iv_flags & IEEE80211_F_XR) && 618170530Ssam (mode == IEEE80211_MODE_TURBO_A || 619170530Ssam mode == IEEE80211_MODE_TURBO_G || 620170530Ssam mode == IEEE80211_MODE_STURBO_A)) 621170530Ssam continue; 622170530Ssam#endif 623170530Ssam /* 624170530Ssam * Add the list of the channels; any that are not 625170530Ssam * in the master channel list will be discarded. 626170530Ssam */ 627178354Ssam add_channels(vap, ss, mode, scan->list, scan->count); 628170530Ssam } 629170530Ssam 630170530Ssam /* 631178354Ssam * Add the channels from the ic that are not present 632178354Ssam * in the table. 633170530Ssam */ 634178354Ssam sweepchannels(ss, vap, table); 635178354Ssam} 636170530Ssam 637178354Ssamstatic const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 638178354Ssam{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 639178354Ssamstatic const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 640178354Ssam{ 5170, 5190, 5210, 5230 }; 641178354Ssamstatic const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 642178354Ssam{ 2412, 2437, 2462, 2442, 2472 }; 643178354Ssamstatic const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 644178354Ssam{ 5745, 5765, 5785, 5805, 5825 }; 645178354Ssamstatic const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 646178354Ssam{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 647178354Ssamstatic const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 648178354Ssam{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 649178354Ssamstatic const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 650178354Ssam{ 2484 }; 651178354Ssamstatic const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 652178354Ssam{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 653178354Ssamstatic const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 654178354Ssam{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 655178354Ssam#ifdef ATH_TURBO_SCAN 656178354Ssamstatic const uint16_t rcl5[] = /* 3 static turbo channels */ 657178354Ssam{ 5210, 5250, 5290 }; 658178354Ssamstatic const uint16_t rcl6[] = /* 2 static turbo channels */ 659178354Ssam{ 5760, 5800 }; 660178354Ssamstatic const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 661178354Ssam{ 5540, 5580, 5620, 5660 }; 662178354Ssamstatic const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 663178354Ssam{ 2437 }; 664178354Ssamstatic const uint16_t rcl13[] = /* dynamic Turbo channels */ 665178354Ssam{ 5200, 5240, 5280, 5765, 5805 }; 666178354Ssam#endif /* ATH_TURBO_SCAN */ 667170530Ssam 668178354Ssam#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 669170530Ssam 670178354Ssamstatic const struct scanlist staScanTable[] = { 671178354Ssam { IEEE80211_MODE_11B, X(rcl3) }, 672178354Ssam { IEEE80211_MODE_11A, X(rcl1) }, 673178354Ssam { IEEE80211_MODE_11A, X(rcl2) }, 674178354Ssam { IEEE80211_MODE_11B, X(rcl8) }, 675178354Ssam { IEEE80211_MODE_11B, X(rcl9) }, 676178354Ssam { IEEE80211_MODE_11A, X(rcl4) }, 677178354Ssam#ifdef ATH_TURBO_SCAN 678178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl5) }, 679178354Ssam { IEEE80211_MODE_STURBO_A, X(rcl6) }, 680178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 681178354Ssam { IEEE80211_MODE_TURBO_A, X(rcl13) }, 682178354Ssam#endif /* ATH_TURBO_SCAN */ 683178354Ssam { IEEE80211_MODE_11A, X(rcl7) }, 684178354Ssam { IEEE80211_MODE_11B, X(rcl10) }, 685178354Ssam { IEEE80211_MODE_11A, X(rcl11) }, 686178354Ssam#ifdef ATH_TURBO_SCAN 687178354Ssam { IEEE80211_MODE_TURBO_G, X(rcl12) }, 688178354Ssam#endif /* ATH_TURBO_SCAN */ 689178354Ssam { .list = NULL } 690178354Ssam}; 691178354Ssam 692178354Ssam/* 693178354Ssam * Start a station-mode scan by populating the channel list. 694178354Ssam */ 695178354Ssamstatic int 696178354Ssamsta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 697178354Ssam{ 698178354Ssam struct sta_table *st = ss->ss_priv; 699178354Ssam 700178354Ssam makescanlist(ss, vap, staScanTable); 701178354Ssam 702178354Ssam if (ss->ss_mindwell == 0) 703178354Ssam ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 704178354Ssam if (ss->ss_maxdwell == 0) 705178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 706178354Ssam 707178354Ssam st->st_scangen++; 708170530Ssam st->st_newscan = 1; 709170530Ssam 710170530Ssam return 0; 711170530Ssam} 712170530Ssam 713170530Ssam/* 714178354Ssam * Restart a scan, typically a bg scan but can 715178354Ssam * also be a fg scan that came up empty. 716170530Ssam */ 717170530Ssamstatic int 718178354Ssamsta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 719170530Ssam{ 720170530Ssam struct sta_table *st = ss->ss_priv; 721170530Ssam 722170530Ssam st->st_newscan = 1; 723170530Ssam return 0; 724170530Ssam} 725170530Ssam 726170530Ssam/* 727170530Ssam * Cancel an ongoing scan. 728170530Ssam */ 729170530Ssamstatic int 730178354Ssamsta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 731170530Ssam{ 732170530Ssam return 0; 733170530Ssam} 734170530Ssam 735178354Ssam/* unalligned little endian access */ 736178354Ssam#define LE_READ_2(p) \ 737178354Ssam ((uint16_t) \ 738178354Ssam ((((const uint8_t *)(p))[0] ) | \ 739178354Ssam (((const uint8_t *)(p))[1] << 8))) 740184302Ssam 741184302Ssam/* 742184302Ssam * Demote any supplied 11g channel to 11b. There should 743184302Ssam * always be an 11b channel but we check anyway... 744184302Ssam */ 745184302Ssamstatic struct ieee80211_channel * 746184302Ssamdemote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 747184302Ssam{ 748184302Ssam struct ieee80211_channel *c; 749178354Ssam 750184302Ssam if (IEEE80211_IS_CHAN_ANYG(chan) && 751184302Ssam vap->iv_des_mode == IEEE80211_MODE_AUTO) { 752184302Ssam c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 753184302Ssam (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 754184302Ssam IEEE80211_CHAN_B); 755184302Ssam if (c != NULL) 756184302Ssam chan = c; 757184302Ssam } 758184302Ssam return chan; 759184302Ssam} 760184302Ssam 761178354Ssamstatic int 762170530Ssammaxrate(const struct ieee80211_scan_entry *se) 763170530Ssam{ 764178354Ssam const struct ieee80211_ie_htcap *htcap = 765178354Ssam (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 766219601Sbschmidt int rmax, r, i, txstream; 767178354Ssam uint16_t caps; 768219601Sbschmidt uint8_t txparams; 769170530Ssam 770170530Ssam rmax = 0; 771178354Ssam if (htcap != NULL) { 772178354Ssam /* 773178354Ssam * HT station; inspect supported MCS and then adjust 774219601Sbschmidt * rate by channel width. 775178354Ssam */ 776219601Sbschmidt txparams = htcap->hc_mcsset[12]; 777219601Sbschmidt if (txparams & 0x3) { 778219601Sbschmidt /* 779219601Sbschmidt * TX MCS parameters defined and not equal to RX, 780219601Sbschmidt * extract the number of spartial streams and 781219601Sbschmidt * map it to the highest MCS rate. 782219601Sbschmidt */ 783219601Sbschmidt txstream = ((txparams & 0xc) >> 2) + 1; 784219601Sbschmidt i = txstream * 8 - 1; 785219601Sbschmidt } else 786219601Sbschmidt for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 787178354Ssam if (i >= 0) { 788178354Ssam caps = LE_READ_2(&htcap->hc_cap); 789219601Sbschmidt if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 790219601Sbschmidt (caps & IEEE80211_HTCAP_SHORTGI40)) 791178354Ssam rmax = ieee80211_htrates[i].ht40_rate_400ns; 792219601Sbschmidt else if (caps & IEEE80211_HTCAP_CHWIDTH40) 793219601Sbschmidt rmax = ieee80211_htrates[i].ht40_rate_800ns; 794219601Sbschmidt else if (caps & IEEE80211_HTCAP_SHORTGI20) 795219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_400ns; 796178354Ssam else 797219601Sbschmidt rmax = ieee80211_htrates[i].ht20_rate_800ns; 798178354Ssam } 799178354Ssam } 800170530Ssam for (i = 0; i < se->se_rates[1]; i++) { 801170530Ssam r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 802170530Ssam if (r > rmax) 803170530Ssam rmax = r; 804170530Ssam } 805170530Ssam for (i = 0; i < se->se_xrates[1]; i++) { 806170530Ssam r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 807170530Ssam if (r > rmax) 808170530Ssam rmax = r; 809170530Ssam } 810170530Ssam return rmax; 811170530Ssam} 812170530Ssam 813170530Ssam/* 814170530Ssam * Compare the capabilities of two entries and decide which is 815170530Ssam * more desirable (return >0 if a is considered better). Note 816170530Ssam * that we assume compatibility/usability has already been checked 817170530Ssam * so we don't need to (e.g. validate whether privacy is supported). 818170530Ssam * Used to select the best scan candidate for association in a BSS. 819170530Ssam */ 820170530Ssamstatic int 821170530Ssamsta_compare(const struct sta_entry *a, const struct sta_entry *b) 822170530Ssam{ 823170530Ssam#define PREFER(_a,_b,_what) do { \ 824170530Ssam if (((_a) ^ (_b)) & (_what)) \ 825170530Ssam return ((_a) & (_what)) ? 1 : -1; \ 826170530Ssam} while (0) 827178354Ssam int maxa, maxb; 828170530Ssam int8_t rssia, rssib; 829170530Ssam int weight; 830170530Ssam 831170530Ssam /* privacy support */ 832170530Ssam PREFER(a->base.se_capinfo, b->base.se_capinfo, 833170530Ssam IEEE80211_CAPINFO_PRIVACY); 834170530Ssam 835170530Ssam /* compare count of previous failures */ 836170530Ssam weight = b->se_fails - a->se_fails; 837170530Ssam if (abs(weight) > 1) 838170530Ssam return weight; 839170530Ssam 840170530Ssam /* 841170530Ssam * Compare rssi. If the two are considered equivalent 842170530Ssam * then fallback to other criteria. We threshold the 843170530Ssam * comparisons to avoid selecting an ap purely by rssi 844170530Ssam * when both values may be good but one ap is otherwise 845170530Ssam * more desirable (e.g. an 11b-only ap with stronger 846170530Ssam * signal than an 11g ap). 847170530Ssam */ 848170530Ssam rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 849170530Ssam rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 850170530Ssam if (abs(rssib - rssia) < 5) { 851170530Ssam /* best/max rate preferred if signal level close enough XXX */ 852170530Ssam maxa = maxrate(&a->base); 853170530Ssam maxb = maxrate(&b->base); 854170530Ssam if (maxa != maxb) 855170530Ssam return maxa - maxb; 856170530Ssam /* XXX use freq for channel preference */ 857170530Ssam /* for now just prefer 5Ghz band to all other bands */ 858178354Ssam PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 859178354Ssam IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 860170530Ssam } 861170530Ssam /* all things being equal, use signal level */ 862170530Ssam return a->base.se_rssi - b->base.se_rssi; 863170530Ssam#undef PREFER 864170530Ssam} 865170530Ssam 866170530Ssam/* 867170530Ssam * Check rate set suitability and return the best supported rate. 868178354Ssam * XXX inspect MCS for HT 869170530Ssam */ 870170530Ssamstatic int 871184302Ssamcheck_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 872184302Ssam const struct ieee80211_scan_entry *se) 873170530Ssam{ 874170530Ssam#define RV(v) ((v) & IEEE80211_RATE_VAL) 875170530Ssam const struct ieee80211_rateset *srs; 876178354Ssam int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 877170530Ssam const uint8_t *rs; 878170530Ssam 879178354Ssam okrate = badrate = 0; 880170530Ssam 881184302Ssam srs = ieee80211_get_suprates(vap->iv_ic, chan); 882170530Ssam nrs = se->se_rates[1]; 883170530Ssam rs = se->se_rates+2; 884178354Ssam /* XXX MCS */ 885184302Ssam ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 886170530Ssam fixedrate = IEEE80211_FIXED_RATE_NONE; 887170530Ssamagain: 888170530Ssam for (i = 0; i < nrs; i++) { 889170530Ssam r = RV(rs[i]); 890170530Ssam badrate = r; 891170530Ssam /* 892170530Ssam * Check any fixed rate is included. 893170530Ssam */ 894178354Ssam if (r == ucastrate) 895170530Ssam fixedrate = r; 896170530Ssam /* 897170530Ssam * Check against our supported rates. 898170530Ssam */ 899170530Ssam for (j = 0; j < srs->rs_nrates; j++) 900170530Ssam if (r == RV(srs->rs_rates[j])) { 901170530Ssam if (r > okrate) /* NB: track max */ 902170530Ssam okrate = r; 903170530Ssam break; 904170530Ssam } 905170530Ssam 906170530Ssam if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 907170530Ssam /* 908170530Ssam * Don't try joining a BSS, if we don't support 909170530Ssam * one of its basic rates. 910170530Ssam */ 911170530Ssam okrate = 0; 912170530Ssam goto back; 913170530Ssam } 914170530Ssam } 915170530Ssam if (rs == se->se_rates+2) { 916170530Ssam /* scan xrates too; sort of an algol68-style for loop */ 917170530Ssam nrs = se->se_xrates[1]; 918170530Ssam rs = se->se_xrates+2; 919170530Ssam goto again; 920170530Ssam } 921170530Ssam 922170530Ssamback: 923178354Ssam if (okrate == 0 || ucastrate != fixedrate) 924170530Ssam return badrate | IEEE80211_RATE_BASIC; 925170530Ssam else 926170530Ssam return RV(okrate); 927170530Ssam#undef RV 928170530Ssam} 929170530Ssam 930195618Srpaulostatic __inline int 931195618Srpaulomatch_id(const uint8_t *ie, const uint8_t *val, int len) 932195618Srpaulo{ 933195618Srpaulo return (ie[1] == len && memcmp(ie+2, val, len) == 0); 934195618Srpaulo} 935195618Srpaulo 936170530Ssamstatic int 937170530Ssammatch_ssid(const uint8_t *ie, 938170530Ssam int nssid, const struct ieee80211_scan_ssid ssids[]) 939170530Ssam{ 940170530Ssam int i; 941170530Ssam 942170530Ssam for (i = 0; i < nssid; i++) { 943195618Srpaulo if (match_id(ie, ssids[i].ssid, ssids[i].len)) 944170530Ssam return 1; 945170530Ssam } 946170530Ssam return 0; 947170530Ssam} 948170530Ssam 949186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 950186904Ssamstatic int 951186904Ssamtdma_isfull(const struct ieee80211_tdma_param *tdma) 952186904Ssam{ 953186904Ssam int slot, slotcnt; 954186904Ssam 955186904Ssam slotcnt = tdma->tdma_slotcnt; 956186904Ssam for (slot = slotcnt-1; slot >= 0; slot--) 957186904Ssam if (isclr(tdma->tdma_inuse, slot)) 958186904Ssam return 0; 959186904Ssam return 1; 960186904Ssam} 961186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 962186904Ssam 963170530Ssam/* 964170530Ssam * Test a scan candidate for suitability/compatibility. 965170530Ssam */ 966170530Ssamstatic int 967178354Ssammatch_bss(struct ieee80211vap *vap, 968170530Ssam const struct ieee80211_scan_state *ss, struct sta_entry *se0, 969170530Ssam int debug) 970170530Ssam{ 971178354Ssam struct ieee80211com *ic = vap->iv_ic; 972170530Ssam struct ieee80211_scan_entry *se = &se0->base; 973178354Ssam uint8_t rate; 974178354Ssam int fail; 975170530Ssam 976170530Ssam fail = 0; 977170530Ssam if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 978171409Ssam fail |= MATCH_CHANNEL; 979170530Ssam /* 980170530Ssam * NB: normally the desired mode is used to construct 981170530Ssam * the channel list, but it's possible for the scan 982170530Ssam * cache to include entries for stations outside this 983170530Ssam * list so we check the desired mode here to weed them 984170530Ssam * out. 985170530Ssam */ 986178354Ssam if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 987170530Ssam (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 988178354Ssam chanflags[vap->iv_des_mode]) 989171409Ssam fail |= MATCH_CHANNEL; 990178354Ssam if (vap->iv_opmode == IEEE80211_M_IBSS) { 991170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 992171409Ssam fail |= MATCH_CAPINFO; 993186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 994186904Ssam } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 995186904Ssam /* 996186904Ssam * Adhoc demo network setup shouldn't really be scanning 997186904Ssam * but just in case skip stations operating in IBSS or 998186904Ssam * BSS mode. 999186904Ssam */ 1000186904Ssam if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1001186904Ssam fail |= MATCH_CAPINFO; 1002186904Ssam /* 1003186904Ssam * TDMA operation cannot coexist with a normal 802.11 network; 1004186904Ssam * skip if IBSS or ESS capabilities are marked and require 1005186904Ssam * the beacon have a TDMA ie present. 1006186904Ssam */ 1007186904Ssam if (vap->iv_caps & IEEE80211_C_TDMA) { 1008186904Ssam const struct ieee80211_tdma_param *tdma = 1009186904Ssam (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1010189980Ssam const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1011186904Ssam 1012186904Ssam if (tdma == NULL) 1013186904Ssam fail |= MATCH_TDMA_NOIE; 1014189980Ssam else if (tdma->tdma_version != ts->tdma_version) 1015189980Ssam fail |= MATCH_TDMA_VERSION; 1016186904Ssam else if (tdma->tdma_slot != 0) 1017186904Ssam fail |= MATCH_TDMA_NOTMASTER; 1018186904Ssam else if (tdma_isfull(tdma)) 1019186904Ssam fail |= MATCH_TDMA_NOSLOT; 1020186904Ssam#if 0 1021186904Ssam else if (ieee80211_local_address(se->se_macaddr)) 1022186904Ssam fail |= MATCH_TDMA_LOCAL; 1023186904Ssam#endif 1024186904Ssam } 1025186904Ssam#endif /* IEEE80211_SUPPORT_TDMA */ 1026195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1027195618Srpaulo } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1028195618Srpaulo const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1029195618Srpaulo /* 1030195618Srpaulo * Mesh nodes have IBSS & ESS bits in capinfo turned off 1031195618Srpaulo * and two special ie's that must be present. 1032195618Srpaulo */ 1033195618Srpaulo if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1034195618Srpaulo fail |= MATCH_CAPINFO; 1035215699Sbschmidt else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1036195618Srpaulo fail |= MATCH_MESH_NOID; 1037195618Srpaulo else if (ms->ms_idlen != 0 && 1038195618Srpaulo match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1039195618Srpaulo fail |= MATCH_MESHID; 1040196005Ssam#endif 1041170530Ssam } else { 1042170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1043171409Ssam fail |= MATCH_CAPINFO; 1044178354Ssam /* 1045178354Ssam * If 11d is enabled and we're attempting to join a bss 1046178354Ssam * that advertises it's country code then compare our 1047178354Ssam * current settings to what we fetched from the country ie. 1048178354Ssam * If our country code is unspecified or different then do 1049178354Ssam * not attempt to join the bss. We should have already 1050178354Ssam * dispatched an event to user space that identifies the 1051178354Ssam * new country code so our regdomain config should match. 1052178354Ssam */ 1053178354Ssam if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1054178354Ssam (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1055178354Ssam se->se_cc[0] != 0 && 1056178354Ssam (ic->ic_regdomain.country == CTRY_DEFAULT || 1057178354Ssam !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1058178354Ssam fail |= MATCH_CC; 1059170530Ssam } 1060178354Ssam if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1061170530Ssam if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1062171409Ssam fail |= MATCH_PRIVACY; 1063170530Ssam } else { 1064170530Ssam /* XXX does this mean privacy is supported or required? */ 1065170530Ssam if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1066171409Ssam fail |= MATCH_PRIVACY; 1067170530Ssam } 1068184302Ssam se0->se_flags &= ~STA_DEMOTE11B; 1069184302Ssam rate = check_rate(vap, se->se_chan, se); 1070184302Ssam if (rate & IEEE80211_RATE_BASIC) { 1071171409Ssam fail |= MATCH_RATE; 1072184302Ssam /* 1073184302Ssam * An 11b-only ap will give a rate mismatch if there is an 1074184302Ssam * OFDM fixed tx rate for 11g. Try downgrading the channel 1075184302Ssam * in the scan list to 11b and retry the rate check. 1076184302Ssam */ 1077184302Ssam if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1078184302Ssam rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1079184302Ssam if ((rate & IEEE80211_RATE_BASIC) == 0) { 1080184302Ssam fail &= ~MATCH_RATE; 1081184302Ssam se0->se_flags |= STA_DEMOTE11B; 1082184302Ssam } 1083184302Ssam } 1084184302Ssam } else if (rate < 2*24) { 1085184302Ssam /* 1086184302Ssam * This is an 11b-only ap. Check the desired mode in 1087184302Ssam * case that needs to be honored (mode 11g filters out 1088184302Ssam * 11b-only ap's). Otherwise force any 11g channel used 1089184302Ssam * in scanning to be demoted. 1090184302Ssam * 1091184302Ssam * NB: we cheat a bit here by looking at the max rate; 1092184302Ssam * we could/should check the rates. 1093184302Ssam */ 1094184302Ssam if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1095184302Ssam vap->iv_des_mode == IEEE80211_MODE_11B)) 1096184302Ssam fail |= MATCH_RATE; 1097184302Ssam else 1098184302Ssam se0->se_flags |= STA_DEMOTE11B; 1099184302Ssam } 1100170530Ssam if (ss->ss_nssid != 0 && 1101171409Ssam !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1102171409Ssam fail |= MATCH_SSID; 1103178354Ssam if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1104178354Ssam !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1105178354Ssam fail |= MATCH_BSSID; 1106170530Ssam if (se0->se_fails >= STA_FAILS_MAX) 1107171409Ssam fail |= MATCH_FAILS; 1108170530Ssam if (se0->se_notseen >= STA_PURGE_SCANS) 1109171409Ssam fail |= MATCH_NOTSEEN; 1110170530Ssam if (se->se_rssi < STA_RSSI_MIN) 1111171409Ssam fail |= MATCH_RSSI; 1112170530Ssam#ifdef IEEE80211_DEBUG 1113178354Ssam if (ieee80211_msg(vap, debug)) { 1114170530Ssam printf(" %c %s", 1115171409Ssam fail & MATCH_FAILS ? '=' : 1116171409Ssam fail & MATCH_NOTSEEN ? '^' : 1117178354Ssam fail & MATCH_CC ? '$' : 1118186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1119186904Ssam fail & MATCH_TDMA_NOIE ? '&' : 1120189980Ssam fail & MATCH_TDMA_VERSION ? 'v' : 1121189980Ssam fail & MATCH_TDMA_NOTMASTER ? 's' : 1122189980Ssam fail & MATCH_TDMA_NOSLOT ? 'f' : 1123189980Ssam fail & MATCH_TDMA_LOCAL ? 'l' : 1124186904Ssam#endif 1125195618Srpaulo fail & MATCH_MESH_NOID ? 'm' : 1126171409Ssam fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1127170530Ssam printf(" %s%c", ether_sprintf(se->se_bssid), 1128171409Ssam fail & MATCH_BSSID ? '!' : ' '); 1129170530Ssam printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1130171409Ssam fail & MATCH_CHANNEL ? '!' : ' '); 1131171409Ssam printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1132170530Ssam printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1133171409Ssam fail & MATCH_RATE ? '!' : ' '); 1134170530Ssam printf(" %4s%c", 1135170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1136189980Ssam (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1137171409Ssam fail & MATCH_CAPINFO ? '!' : ' '); 1138170530Ssam printf(" %3s%c ", 1139170530Ssam (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1140170530Ssam "wep" : "no", 1141171409Ssam fail & MATCH_PRIVACY ? '!' : ' '); 1142170530Ssam ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1143195618Srpaulo printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1144170530Ssam } 1145170530Ssam#endif 1146170530Ssam return fail; 1147170530Ssam} 1148170530Ssam 1149170530Ssamstatic void 1150170530Ssamsta_update_notseen(struct sta_table *st) 1151170530Ssam{ 1152170530Ssam struct sta_entry *se; 1153170530Ssam 1154206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1155170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1156170530Ssam /* 1157170530Ssam * If seen the reset and don't bump the count; 1158170530Ssam * otherwise bump the ``not seen'' count. Note 1159170530Ssam * that this insures that stations for which we 1160170530Ssam * see frames while not scanning but not during 1161170530Ssam * this scan will not be penalized. 1162170530Ssam */ 1163170530Ssam if (se->se_seen) 1164170530Ssam se->se_seen = 0; 1165170530Ssam else 1166170530Ssam se->se_notseen++; 1167170530Ssam } 1168206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1169170530Ssam} 1170170530Ssam 1171170530Ssamstatic void 1172170530Ssamsta_dec_fails(struct sta_table *st) 1173170530Ssam{ 1174170530Ssam struct sta_entry *se; 1175170530Ssam 1176206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1177170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) 1178170530Ssam if (se->se_fails) 1179170530Ssam se->se_fails--; 1180206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1181170530Ssam} 1182170530Ssam 1183170530Ssamstatic struct sta_entry * 1184178354Ssamselect_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1185170530Ssam{ 1186170530Ssam struct sta_table *st = ss->ss_priv; 1187170530Ssam struct sta_entry *se, *selbs = NULL; 1188170530Ssam 1189178354Ssam IEEE80211_DPRINTF(vap, debug, " %s\n", 1190170530Ssam "macaddr bssid chan rssi rate flag wep essid"); 1191206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1192170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1193184275Ssam ieee80211_ies_expand(&se->base.se_ies); 1194178354Ssam if (match_bss(vap, ss, se, debug) == 0) { 1195170530Ssam if (selbs == NULL) 1196170530Ssam selbs = se; 1197170530Ssam else if (sta_compare(se, selbs) > 0) 1198170530Ssam selbs = se; 1199170530Ssam } 1200170530Ssam } 1201206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1202170530Ssam 1203170530Ssam return selbs; 1204170530Ssam} 1205170530Ssam 1206170530Ssam/* 1207170530Ssam * Pick an ap or ibss network to join or find a channel 1208170530Ssam * to use to start an ibss network. 1209170530Ssam */ 1210170530Ssamstatic int 1211178354Ssamsta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1212170530Ssam{ 1213170530Ssam struct sta_table *st = ss->ss_priv; 1214170530Ssam struct sta_entry *selbs; 1215184274Ssam struct ieee80211_channel *chan; 1216170530Ssam 1217178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1218178354Ssam ("wrong mode %u", vap->iv_opmode)); 1219170530Ssam 1220170530Ssam if (st->st_newscan) { 1221170530Ssam sta_update_notseen(st); 1222170530Ssam st->st_newscan = 0; 1223170530Ssam } 1224170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1225170530Ssam /* 1226170530Ssam * Manual/background scan, don't select+join the 1227170530Ssam * bss, just return. The scanning framework will 1228170530Ssam * handle notification that this has completed. 1229170530Ssam */ 1230170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1231170530Ssam return 1; 1232170530Ssam } 1233170530Ssam /* 1234170530Ssam * Automatic sequencing; look for a candidate and 1235170530Ssam * if found join the network. 1236170530Ssam */ 1237170530Ssam /* NB: unlocked read should be ok */ 1238170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1239178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1240170530Ssam "%s: no scan candidate\n", __func__); 1241178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1242178354Ssam return 0; 1243170530Ssamnotfound: 1244170530Ssam /* 1245170530Ssam * If nothing suitable was found decrement 1246170530Ssam * the failure counts so entries will be 1247170530Ssam * reconsidered the next time around. We 1248170530Ssam * really want to do this only for sta's 1249170530Ssam * where we've previously had some success. 1250170530Ssam */ 1251170530Ssam sta_dec_fails(st); 1252170530Ssam st->st_newscan = 1; 1253170530Ssam return 0; /* restart scan */ 1254170530Ssam } 1255178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1256178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1257178354Ssam return (selbs != NULL); 1258184274Ssam if (selbs == NULL) 1259170530Ssam goto notfound; 1260184274Ssam chan = selbs->base.se_chan; 1261184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1262184302Ssam chan = demote11b(vap, chan); 1263184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1264184274Ssam goto notfound; 1265170530Ssam return 1; /* terminate scan */ 1266170530Ssam} 1267170530Ssam 1268170530Ssam/* 1269170530Ssam * Lookup an entry in the scan cache. We assume we're 1270170530Ssam * called from the bottom half or such that we don't need 1271170530Ssam * to block the bottom half so that it's safe to return 1272170530Ssam * a reference to an entry w/o holding the lock on the table. 1273170530Ssam */ 1274170530Ssamstatic struct sta_entry * 1275170530Ssamsta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1276170530Ssam{ 1277170530Ssam struct sta_entry *se; 1278170530Ssam int hash = STA_HASH(macaddr); 1279170530Ssam 1280206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1281170530Ssam LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1282170530Ssam if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1283170530Ssam break; 1284206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1285170530Ssam 1286170530Ssam return se; /* NB: unlocked */ 1287170530Ssam} 1288170530Ssam 1289170530Ssamstatic void 1290178354Ssamsta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1291170530Ssam{ 1292178354Ssam struct ieee80211com *ic = vap->iv_ic; 1293178354Ssam struct ieee80211_node *ni = vap->iv_bss; 1294170530Ssam struct sta_table *st = ss->ss_priv; 1295178354Ssam enum ieee80211_phymode mode; 1296170530Ssam struct sta_entry *se, *selbs; 1297178354Ssam uint8_t roamRate, curRate, ucastRate; 1298170530Ssam int8_t roamRssi, curRssi; 1299170530Ssam 1300170530Ssam se = sta_lookup(st, ni->ni_macaddr); 1301170530Ssam if (se == NULL) { 1302170530Ssam /* XXX something is wrong */ 1303170530Ssam return; 1304170530Ssam } 1305170530Ssam 1306178354Ssam mode = ieee80211_chan2mode(ic->ic_bsschan); 1307178354Ssam roamRate = vap->iv_roamparms[mode].rate; 1308178354Ssam roamRssi = vap->iv_roamparms[mode].rssi; 1309178354Ssam ucastRate = vap->iv_txparms[mode].ucastrate; 1310170530Ssam /* NB: the most up to date rssi is in the node, not the scan cache */ 1311170530Ssam curRssi = ic->ic_node_getrssi(ni); 1312178354Ssam if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1313178354Ssam curRate = ni->ni_txrate; 1314178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1315170530Ssam "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1316170530Ssam __func__, curRssi, curRate, roamRssi, roamRate); 1317170530Ssam } else { 1318170530Ssam curRate = roamRate; /* NB: insure compare below fails */ 1319178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1320170530Ssam "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1321170530Ssam } 1322170530Ssam /* 1323170530Ssam * Check if a new ap should be used and switch. 1324170530Ssam * XXX deauth current ap 1325170530Ssam */ 1326170530Ssam if (curRate < roamRate || curRssi < roamRssi) { 1327178354Ssam if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1328170530Ssam /* 1329170530Ssam * Scan cache contents are too old; force a scan now 1330170530Ssam * if possible so we have current state to make a 1331170530Ssam * decision with. We don't kick off a bg scan if 1332170530Ssam * we're using dynamic turbo and boosted or if the 1333170530Ssam * channel is busy. 1334170530Ssam * XXX force immediate switch on scan complete 1335170530Ssam */ 1336170530Ssam if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1337178354Ssam time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1338178354Ssam ieee80211_bg_scan(vap, 0); 1339170530Ssam return; 1340170530Ssam } 1341170530Ssam se->base.se_rssi = curRssi; 1342178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1343170530Ssam if (selbs != NULL && selbs != se) { 1344184274Ssam struct ieee80211_channel *chan; 1345184274Ssam 1346178354Ssam IEEE80211_DPRINTF(vap, 1347170530Ssam IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1348170530Ssam "%s: ROAM: curRate %u, roamRate %u, " 1349170530Ssam "curRssi %d, roamRssi %d\n", __func__, 1350170530Ssam curRate, roamRate, curRssi, roamRssi); 1351184274Ssam 1352184274Ssam chan = selbs->base.se_chan; 1353184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1354184302Ssam chan = demote11b(vap, chan); 1355184274Ssam (void) ieee80211_sta_join(vap, chan, &selbs->base); 1356170530Ssam } 1357170530Ssam } 1358170530Ssam} 1359170530Ssam 1360170530Ssam/* 1361170530Ssam * Age entries in the scan cache. 1362170530Ssam * XXX also do roaming since it's convenient 1363170530Ssam */ 1364170530Ssamstatic void 1365170530Ssamsta_age(struct ieee80211_scan_state *ss) 1366170530Ssam{ 1367178354Ssam struct ieee80211vap *vap = ss->ss_vap; 1368170530Ssam 1369178354Ssam adhoc_age(ss); 1370170530Ssam /* 1371170530Ssam * If rate control is enabled check periodically to see if 1372170530Ssam * we should roam from our current connection to one that 1373170530Ssam * might be better. This only applies when we're operating 1374170530Ssam * in sta mode and automatic roaming is set. 1375170530Ssam * XXX defer if busy 1376170530Ssam * XXX repeater station 1377170530Ssam * XXX do when !bgscan? 1378170530Ssam */ 1379178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1380178354Ssam ("wrong mode %u", vap->iv_opmode)); 1381178354Ssam if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1382213321Sadrian (vap->iv_flags & IEEE80211_F_BGSCAN) && 1383178354Ssam vap->iv_state >= IEEE80211_S_RUN) 1384170530Ssam /* XXX vap is implicit */ 1385178354Ssam sta_roam_check(ss, vap); 1386170530Ssam} 1387170530Ssam 1388170530Ssam/* 1389170530Ssam * Iterate over the entries in the scan cache, invoking 1390170530Ssam * the callback function on each one. 1391170530Ssam */ 1392170530Ssamstatic void 1393170530Ssamsta_iterate(struct ieee80211_scan_state *ss, 1394170530Ssam ieee80211_scan_iter_func *f, void *arg) 1395170530Ssam{ 1396170530Ssam struct sta_table *st = ss->ss_priv; 1397170530Ssam struct sta_entry *se; 1398170530Ssam u_int gen; 1399170530Ssam 1400170530Ssam mtx_lock(&st->st_scanlock); 1401178354Ssam gen = st->st_scaniter++; 1402170530Ssamrestart: 1403206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1404170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1405170530Ssam if (se->se_scangen != gen) { 1406170530Ssam se->se_scangen = gen; 1407170530Ssam /* update public state */ 1408170530Ssam se->base.se_age = ticks - se->se_lastupdate; 1409206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1410170530Ssam (*f)(arg, &se->base); 1411170530Ssam goto restart; 1412170530Ssam } 1413170530Ssam } 1414206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1415170530Ssam 1416170530Ssam mtx_unlock(&st->st_scanlock); 1417170530Ssam} 1418170530Ssam 1419170530Ssamstatic void 1420170530Ssamsta_assoc_fail(struct ieee80211_scan_state *ss, 1421170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1422170530Ssam{ 1423170530Ssam struct sta_table *st = ss->ss_priv; 1424170530Ssam struct sta_entry *se; 1425170530Ssam 1426170530Ssam se = sta_lookup(st, macaddr); 1427170530Ssam if (se != NULL) { 1428170530Ssam se->se_fails++; 1429170530Ssam se->se_lastfail = ticks; 1430178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1431170530Ssam macaddr, "%s: reason %u fails %u", 1432170530Ssam __func__, reason, se->se_fails); 1433170530Ssam } 1434170530Ssam} 1435170530Ssam 1436170530Ssamstatic void 1437170530Ssamsta_assoc_success(struct ieee80211_scan_state *ss, 1438170530Ssam const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1439170530Ssam{ 1440170530Ssam struct sta_table *st = ss->ss_priv; 1441170530Ssam struct sta_entry *se; 1442170530Ssam 1443170530Ssam se = sta_lookup(st, macaddr); 1444170530Ssam if (se != NULL) { 1445170530Ssam#if 0 1446170530Ssam se->se_fails = 0; 1447178354Ssam IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1448170530Ssam macaddr, "%s: fails %u", 1449170530Ssam __func__, se->se_fails); 1450170530Ssam#endif 1451170530Ssam se->se_lastassoc = ticks; 1452170530Ssam } 1453170530Ssam} 1454170530Ssam 1455170530Ssamstatic const struct ieee80211_scanner sta_default = { 1456170530Ssam .scan_name = "default", 1457170530Ssam .scan_attach = sta_attach, 1458170530Ssam .scan_detach = sta_detach, 1459170530Ssam .scan_start = sta_start, 1460170530Ssam .scan_restart = sta_restart, 1461170530Ssam .scan_cancel = sta_cancel, 1462170530Ssam .scan_end = sta_pick_bss, 1463170530Ssam .scan_flush = sta_flush, 1464170530Ssam .scan_add = sta_add, 1465170530Ssam .scan_age = sta_age, 1466170530Ssam .scan_iterate = sta_iterate, 1467170530Ssam .scan_assoc_fail = sta_assoc_fail, 1468170530Ssam .scan_assoc_success = sta_assoc_success, 1469170530Ssam}; 1470195618SrpauloIEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1471170530Ssam 1472170530Ssam/* 1473170530Ssam * Adhoc mode-specific support. 1474170530Ssam */ 1475170530Ssam 1476170530Ssamstatic const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1477170530Ssam{ 5180, 5200, 5220, 5240 }; 1478170530Ssamstatic const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1479170530Ssam{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1480170530Ssamstatic const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1481170530Ssam{ 5170, 5190, 5210, 5230 }; 1482170530Ssamstatic const uint16_t adhoc11b[] = /* 10, 11 */ 1483170530Ssam{ 2457, 2462 }; 1484170530Ssam 1485170530Ssamstatic const struct scanlist adhocScanTable[] = { 1486170530Ssam { IEEE80211_MODE_11B, X(adhoc11b) }, 1487170530Ssam { IEEE80211_MODE_11A, X(adhocWorld) }, 1488170530Ssam { IEEE80211_MODE_11A, X(adhocFcc3) }, 1489170530Ssam { IEEE80211_MODE_11B, X(adhocMkk) }, 1490170530Ssam { .list = NULL } 1491170530Ssam}; 1492170530Ssam#undef X 1493170530Ssam 1494170530Ssam/* 1495170530Ssam * Start an adhoc-mode scan by populating the channel list. 1496170530Ssam */ 1497170530Ssamstatic int 1498178354Ssamadhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1499170530Ssam{ 1500170530Ssam struct sta_table *st = ss->ss_priv; 1501170530Ssam 1502178354Ssam makescanlist(ss, vap, adhocScanTable); 1503176653Ssam 1504178354Ssam if (ss->ss_mindwell == 0) 1505178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1506178354Ssam if (ss->ss_maxdwell == 0) 1507178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1508176653Ssam 1509178354Ssam st->st_scangen++; 1510170530Ssam st->st_newscan = 1; 1511170530Ssam 1512170530Ssam return 0; 1513170530Ssam} 1514170530Ssam 1515170530Ssam/* 1516170530Ssam * Select a channel to start an adhoc network on. 1517170530Ssam * The channel list was populated with appropriate 1518170530Ssam * channels so select one that looks least occupied. 1519170530Ssam */ 1520170530Ssamstatic struct ieee80211_channel * 1521178354Ssamadhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1522170530Ssam{ 1523170530Ssam struct sta_table *st = ss->ss_priv; 1524170530Ssam struct sta_entry *se; 1525170530Ssam struct ieee80211_channel *c, *bestchan; 1526170530Ssam int i, bestrssi, maxrssi; 1527170530Ssam 1528170530Ssam bestchan = NULL; 1529170530Ssam bestrssi = -1; 1530170530Ssam 1531206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1532170530Ssam for (i = 0; i < ss->ss_last; i++) { 1533170530Ssam c = ss->ss_chans[i]; 1534178354Ssam /* never consider a channel with radar */ 1535178354Ssam if (IEEE80211_IS_CHAN_RADAR(c)) 1536176653Ssam continue; 1537178354Ssam /* skip channels disallowed by regulatory settings */ 1538178354Ssam if (IEEE80211_IS_CHAN_NOADHOC(c)) 1539178354Ssam continue; 1540178354Ssam /* check channel attributes for band compatibility */ 1541178354Ssam if (flags != 0 && (c->ic_flags & flags) != flags) 1542178354Ssam continue; 1543170530Ssam maxrssi = 0; 1544170530Ssam TAILQ_FOREACH(se, &st->st_entry, se_list) { 1545170530Ssam if (se->base.se_chan != c) 1546170530Ssam continue; 1547170530Ssam if (se->base.se_rssi > maxrssi) 1548170530Ssam maxrssi = se->base.se_rssi; 1549170530Ssam } 1550170530Ssam if (bestchan == NULL || maxrssi < bestrssi) 1551170530Ssam bestchan = c; 1552170530Ssam } 1553206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1554170530Ssam 1555170530Ssam return bestchan; 1556170530Ssam} 1557170530Ssam 1558170530Ssam/* 1559170530Ssam * Pick an ibss network to join or find a channel 1560170530Ssam * to use to start an ibss network. 1561170530Ssam */ 1562170530Ssamstatic int 1563178354Ssamadhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1564170530Ssam{ 1565170530Ssam struct sta_table *st = ss->ss_priv; 1566170530Ssam struct sta_entry *selbs; 1567170530Ssam struct ieee80211_channel *chan; 1568245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1569170530Ssam 1570178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1571195618Srpaulo vap->iv_opmode == IEEE80211_M_AHDEMO || 1572195618Srpaulo vap->iv_opmode == IEEE80211_M_MBSS, 1573178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1574170530Ssam 1575170530Ssam if (st->st_newscan) { 1576170530Ssam sta_update_notseen(st); 1577170530Ssam st->st_newscan = 0; 1578170530Ssam } 1579170530Ssam if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1580170530Ssam /* 1581170530Ssam * Manual/background scan, don't select+join the 1582170530Ssam * bss, just return. The scanning framework will 1583170530Ssam * handle notification that this has completed. 1584170530Ssam */ 1585170530Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1586170530Ssam return 1; 1587170530Ssam } 1588170530Ssam /* 1589170530Ssam * Automatic sequencing; look for a candidate and 1590170530Ssam * if found join the network. 1591170530Ssam */ 1592170530Ssam /* NB: unlocked read should be ok */ 1593170530Ssam if (TAILQ_FIRST(&st->st_entry) == NULL) { 1594178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1595170530Ssam "%s: no scan candidate\n", __func__); 1596178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1597178354Ssam return 0; 1598170530Ssamnotfound: 1599186904Ssam /* NB: never auto-start a tdma network for slot !0 */ 1600186904Ssam#ifdef IEEE80211_SUPPORT_TDMA 1601186904Ssam if (vap->iv_des_nssid && 1602186904Ssam ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1603186904Ssam ieee80211_tdma_getslot(vap) == 0)) { 1604186904Ssam#else 1605178354Ssam if (vap->iv_des_nssid) { 1606186904Ssam#endif 1607170530Ssam /* 1608170530Ssam * No existing adhoc network to join and we have 1609170530Ssam * an ssid; start one up. If no channel was 1610170530Ssam * specified, try to select a channel. 1611170530Ssam */ 1612178354Ssam if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1613178354Ssam IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1614183421Ssam chan = adhoc_pick_channel(ss, 0); 1615178354Ssam } else 1616178354Ssam chan = vap->iv_des_chan; 1617170530Ssam if (chan != NULL) { 1618245928Sadrian struct ieee80211com *ic = vap->iv_ic; 1619245928Sadrian /* 1620245928Sadrian * Create a HT capable IBSS; the per-node 1621245928Sadrian * probe request/response will result in 1622245928Sadrian * "correct" rate control capabilities being 1623245928Sadrian * negotiated. 1624245928Sadrian */ 1625245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1626245928Sadrian chan, vap->iv_flags_ht); 1627178354Ssam ieee80211_create_ibss(vap, chan); 1628170530Ssam return 1; 1629170530Ssam } 1630170530Ssam } 1631170530Ssam /* 1632170530Ssam * If nothing suitable was found decrement 1633170530Ssam * the failure counts so entries will be 1634170530Ssam * reconsidered the next time around. We 1635170530Ssam * really want to do this only for sta's 1636170530Ssam * where we've previously had some success. 1637170530Ssam */ 1638170530Ssam sta_dec_fails(st); 1639170530Ssam st->st_newscan = 1; 1640170530Ssam return 0; /* restart scan */ 1641170530Ssam } 1642178354Ssam selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1643178354Ssam if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1644178354Ssam return (selbs != NULL); 1645184274Ssam if (selbs == NULL) 1646170530Ssam goto notfound; 1647184274Ssam chan = selbs->base.se_chan; 1648184302Ssam if (selbs->se_flags & STA_DEMOTE11B) 1649184302Ssam chan = demote11b(vap, chan); 1650245928Sadrian /* 1651245928Sadrian * If HT is available, make it a possibility here. 1652245928Sadrian * The intent is to enable HT20/HT40 when joining a non-HT 1653245928Sadrian * IBSS node; we can then advertise HT IEs and speak HT 1654245928Sadrian * to any subsequent nodes that support it. 1655245928Sadrian */ 1656245928Sadrian chan = ieee80211_ht_adjust_channel(ic, 1657245928Sadrian chan, vap->iv_flags_ht); 1658184274Ssam if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1659184274Ssam goto notfound; 1660170530Ssam return 1; /* terminate scan */ 1661170530Ssam} 1662170530Ssam 1663170530Ssam/* 1664170530Ssam * Age entries in the scan cache. 1665170530Ssam */ 1666170530Ssamstatic void 1667170530Ssamadhoc_age(struct ieee80211_scan_state *ss) 1668170530Ssam{ 1669170530Ssam struct sta_table *st = ss->ss_priv; 1670170530Ssam struct sta_entry *se, *next; 1671170530Ssam 1672206617Srpaulo IEEE80211_SCAN_TABLE_LOCK(st); 1673170530Ssam TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1674170530Ssam if (se->se_notseen > STA_PURGE_SCANS) { 1675170530Ssam TAILQ_REMOVE(&st->st_entry, se, se_list); 1676170530Ssam LIST_REMOVE(se, se_hash); 1677178354Ssam ieee80211_ies_cleanup(&se->base.se_ies); 1678186302Ssam free(se, M_80211_SCAN); 1679170530Ssam } 1680170530Ssam } 1681206617Srpaulo IEEE80211_SCAN_TABLE_UNLOCK(st); 1682170530Ssam} 1683170530Ssam 1684170530Ssamstatic const struct ieee80211_scanner adhoc_default = { 1685170530Ssam .scan_name = "default", 1686170530Ssam .scan_attach = sta_attach, 1687170530Ssam .scan_detach = sta_detach, 1688170530Ssam .scan_start = adhoc_start, 1689170530Ssam .scan_restart = sta_restart, 1690170530Ssam .scan_cancel = sta_cancel, 1691170530Ssam .scan_end = adhoc_pick_bss, 1692170530Ssam .scan_flush = sta_flush, 1693178354Ssam .scan_pickchan = adhoc_pick_channel, 1694170530Ssam .scan_add = sta_add, 1695170530Ssam .scan_age = adhoc_age, 1696170530Ssam .scan_iterate = sta_iterate, 1697170530Ssam .scan_assoc_fail = sta_assoc_fail, 1698170530Ssam .scan_assoc_success = sta_assoc_success, 1699170530Ssam}; 1700195618SrpauloIEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1701195618SrpauloIEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1702170530Ssam 1703178354Ssamstatic void 1704178354Ssamap_force_promisc(struct ieee80211com *ic) 1705178354Ssam{ 1706178354Ssam struct ifnet *ifp = ic->ic_ifp; 1707178354Ssam 1708178354Ssam IEEE80211_LOCK(ic); 1709178354Ssam /* set interface into promiscuous mode */ 1710178354Ssam ifp->if_flags |= IFF_PROMISC; 1711191746Sthompsa ieee80211_runtask(ic, &ic->ic_promisc_task); 1712178354Ssam IEEE80211_UNLOCK(ic); 1713178354Ssam} 1714178354Ssam 1715178354Ssamstatic void 1716178354Ssamap_reset_promisc(struct ieee80211com *ic) 1717178354Ssam{ 1718178354Ssam IEEE80211_LOCK(ic); 1719178354Ssam ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1720178354Ssam IEEE80211_UNLOCK(ic); 1721178354Ssam} 1722178354Ssam 1723178354Ssamstatic int 1724178354Ssamap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1725178354Ssam{ 1726178354Ssam struct sta_table *st = ss->ss_priv; 1727178354Ssam 1728178354Ssam makescanlist(ss, vap, staScanTable); 1729178354Ssam 1730178354Ssam if (ss->ss_mindwell == 0) 1731178354Ssam ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1732178354Ssam if (ss->ss_maxdwell == 0) 1733178354Ssam ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1734178354Ssam 1735178354Ssam st->st_scangen++; 1736178354Ssam st->st_newscan = 1; 1737178354Ssam 1738178354Ssam ap_force_promisc(vap->iv_ic); 1739178354Ssam return 0; 1740178354Ssam} 1741178354Ssam 1742170530Ssam/* 1743178354Ssam * Cancel an ongoing scan. 1744170530Ssam */ 1745170530Ssamstatic int 1746178354Ssamap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1747170530Ssam{ 1748178354Ssam ap_reset_promisc(vap->iv_ic); 1749178354Ssam return 0; 1750178354Ssam} 1751178354Ssam 1752178354Ssam/* 1753178354Ssam * Pick a quiet channel to use for ap operation. 1754178354Ssam */ 1755178354Ssamstatic struct ieee80211_channel * 1756178354Ssamap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1757178354Ssam{ 1758178354Ssam struct sta_table *st = ss->ss_priv; 1759178354Ssam struct ieee80211_channel *bestchan = NULL; 1760178354Ssam int i; 1761178354Ssam 1762178354Ssam /* XXX select channel more intelligently, e.g. channel spread, power */ 1763178354Ssam /* NB: use scan list order to preserve channel preference */ 1764178354Ssam for (i = 0; i < ss->ss_last; i++) { 1765178354Ssam struct ieee80211_channel *chan = ss->ss_chans[i]; 1766178354Ssam /* 1767178354Ssam * If the channel is unoccupied the max rssi 1768178354Ssam * should be zero; just take it. Otherwise 1769178354Ssam * track the channel with the lowest rssi and 1770178354Ssam * use that when all channels appear occupied. 1771178354Ssam */ 1772178354Ssam if (IEEE80211_IS_CHAN_RADAR(chan)) 1773178354Ssam continue; 1774178354Ssam if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1775178354Ssam continue; 1776178354Ssam /* check channel attributes for band compatibility */ 1777178354Ssam if (flags != 0 && (chan->ic_flags & flags) != flags) 1778178354Ssam continue; 1779186107Ssam KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1780178354Ssam /* XXX channel have interference */ 1781178354Ssam if (st->st_maxrssi[chan->ic_ieee] == 0) { 1782178354Ssam /* XXX use other considerations */ 1783178354Ssam return chan; 1784170530Ssam } 1785178354Ssam if (bestchan == NULL || 1786178354Ssam st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1787178354Ssam bestchan = chan; 1788178354Ssam } 1789178354Ssam return bestchan; 1790178354Ssam} 1791178354Ssam 1792178354Ssam/* 1793178354Ssam * Pick a quiet channel to use for ap operation. 1794178354Ssam */ 1795178354Ssamstatic int 1796178354Ssamap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1797178354Ssam{ 1798178354Ssam struct ieee80211com *ic = vap->iv_ic; 1799178354Ssam struct ieee80211_channel *bestchan; 1800178354Ssam 1801178354Ssam KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1802178354Ssam ("wrong opmode %u", vap->iv_opmode)); 1803178354Ssam bestchan = ap_pick_channel(ss, 0); 1804178354Ssam if (bestchan == NULL) { 1805178354Ssam /* no suitable channel, should not happen */ 1806178354Ssam IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1807178354Ssam "%s: no suitable channel! (should not happen)\n", __func__); 1808178354Ssam /* XXX print something? */ 1809178354Ssam return 0; /* restart scan */ 1810178354Ssam } 1811178354Ssam /* 1812178354Ssam * If this is a dynamic turbo channel, start with the unboosted one. 1813178354Ssam */ 1814178354Ssam if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1815178354Ssam bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1816178354Ssam bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1817178354Ssam if (bestchan == NULL) { 1818178354Ssam /* should never happen ?? */ 1819178354Ssam return 0; 1820170530Ssam } 1821170530Ssam } 1822178354Ssam ap_reset_promisc(ic); 1823178354Ssam if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1824178354Ssam /* 1825178354Ssam * Manual/background scan, don't select+join the 1826178354Ssam * bss, just return. The scanning framework will 1827178354Ssam * handle notification that this has completed. 1828178354Ssam */ 1829178354Ssam ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1830178354Ssam return 1; 1831178354Ssam } 1832178354Ssam ieee80211_create_ibss(vap, 1833193655Ssam ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1834178354Ssam return 1; 1835170530Ssam} 1836170530Ssam 1837178354Ssamstatic const struct ieee80211_scanner ap_default = { 1838178354Ssam .scan_name = "default", 1839178354Ssam .scan_attach = sta_attach, 1840178354Ssam .scan_detach = sta_detach, 1841178354Ssam .scan_start = ap_start, 1842178354Ssam .scan_restart = sta_restart, 1843178354Ssam .scan_cancel = ap_cancel, 1844178354Ssam .scan_end = ap_end, 1845178354Ssam .scan_flush = sta_flush, 1846178354Ssam .scan_pickchan = ap_pick_channel, 1847178354Ssam .scan_add = sta_add, 1848178354Ssam .scan_age = adhoc_age, 1849178354Ssam .scan_iterate = sta_iterate, 1850178354Ssam .scan_assoc_success = sta_assoc_success, 1851178354Ssam .scan_assoc_fail = sta_assoc_fail, 1852170530Ssam}; 1853195618SrpauloIEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1854178354Ssam 1855195618Srpaulo#ifdef IEEE80211_SUPPORT_MESH 1856178354Ssam/* 1857195618Srpaulo * Pick an mbss network to join or find a channel 1858195618Srpaulo * to use to start an mbss network. 1859178354Ssam */ 1860195618Srpaulostatic int 1861195618Srpaulomesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1862195618Srpaulo{ 1863195618Srpaulo struct sta_table *st = ss->ss_priv; 1864195618Srpaulo struct ieee80211_mesh_state *ms = vap->iv_mesh; 1865195618Srpaulo struct sta_entry *selbs; 1866195618Srpaulo struct ieee80211_channel *chan; 1867195618Srpaulo 1868195618Srpaulo KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1869195618Srpaulo ("wrong opmode %u", vap->iv_opmode)); 1870195618Srpaulo 1871195618Srpaulo if (st->st_newscan) { 1872195618Srpaulo sta_update_notseen(st); 1873195618Srpaulo st->st_newscan = 0; 1874195618Srpaulo } 1875195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1876195618Srpaulo /* 1877195618Srpaulo * Manual/background scan, don't select+join the 1878195618Srpaulo * bss, just return. The scanning framework will 1879195618Srpaulo * handle notification that this has completed. 1880195618Srpaulo */ 1881195618Srpaulo ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1882195618Srpaulo return 1; 1883195618Srpaulo } 1884195618Srpaulo /* 1885195618Srpaulo * Automatic sequencing; look for a candidate and 1886195618Srpaulo * if found join the network. 1887195618Srpaulo */ 1888195618Srpaulo /* NB: unlocked read should be ok */ 1889195618Srpaulo if (TAILQ_FIRST(&st->st_entry) == NULL) { 1890195618Srpaulo IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1891195618Srpaulo "%s: no scan candidate\n", __func__); 1892195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1893195618Srpaulo return 0; 1894195618Srpaulonotfound: 1895195618Srpaulo if (ms->ms_idlen != 0) { 1896195618Srpaulo /* 1897195618Srpaulo * No existing mbss network to join and we have 1898195618Srpaulo * a meshid; start one up. If no channel was 1899195618Srpaulo * specified, try to select a channel. 1900195618Srpaulo */ 1901195618Srpaulo if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1902195618Srpaulo IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1903195618Srpaulo struct ieee80211com *ic = vap->iv_ic; 1904195618Srpaulo 1905195618Srpaulo chan = adhoc_pick_channel(ss, 0); 1906195618Srpaulo if (chan != NULL) 1907195618Srpaulo chan = ieee80211_ht_adjust_channel(ic, 1908195618Srpaulo chan, vap->iv_flags_ht); 1909195618Srpaulo } else 1910195618Srpaulo chan = vap->iv_des_chan; 1911195618Srpaulo if (chan != NULL) { 1912195618Srpaulo ieee80211_create_ibss(vap, chan); 1913195618Srpaulo return 1; 1914195618Srpaulo } 1915195618Srpaulo } 1916195618Srpaulo /* 1917195618Srpaulo * If nothing suitable was found decrement 1918195618Srpaulo * the failure counts so entries will be 1919195618Srpaulo * reconsidered the next time around. We 1920195618Srpaulo * really want to do this only for sta's 1921195618Srpaulo * where we've previously had some success. 1922195618Srpaulo */ 1923195618Srpaulo sta_dec_fails(st); 1924195618Srpaulo st->st_newscan = 1; 1925195618Srpaulo return 0; /* restart scan */ 1926195618Srpaulo } 1927195618Srpaulo selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1928195618Srpaulo if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1929195618Srpaulo return (selbs != NULL); 1930195618Srpaulo if (selbs == NULL) 1931195618Srpaulo goto notfound; 1932195618Srpaulo chan = selbs->base.se_chan; 1933195618Srpaulo if (selbs->se_flags & STA_DEMOTE11B) 1934195618Srpaulo chan = demote11b(vap, chan); 1935195618Srpaulo if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1936195618Srpaulo goto notfound; 1937195618Srpaulo return 1; /* terminate scan */ 1938195618Srpaulo} 1939195618Srpaulo 1940195618Srpaulostatic const struct ieee80211_scanner mesh_default = { 1941195618Srpaulo .scan_name = "default", 1942195618Srpaulo .scan_attach = sta_attach, 1943195618Srpaulo .scan_detach = sta_detach, 1944195618Srpaulo .scan_start = adhoc_start, 1945195618Srpaulo .scan_restart = sta_restart, 1946195618Srpaulo .scan_cancel = sta_cancel, 1947195618Srpaulo .scan_end = mesh_pick_bss, 1948195618Srpaulo .scan_flush = sta_flush, 1949195618Srpaulo .scan_pickchan = adhoc_pick_channel, 1950195618Srpaulo .scan_add = sta_add, 1951195618Srpaulo .scan_age = adhoc_age, 1952195618Srpaulo .scan_iterate = sta_iterate, 1953195618Srpaulo .scan_assoc_fail = sta_assoc_fail, 1954195618Srpaulo .scan_assoc_success = sta_assoc_success, 1955195618Srpaulo}; 1956195618SrpauloIEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1957195618Srpaulo#endif /* IEEE80211_SUPPORT_MESH */ 1958