2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 * IEEE 802.11 station scanning support.
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
39 #include <sys/socket.h>
42 #include <net/if_var.h>
43 #include <net/if_media.h>
44 #include <net/ethernet.h>
46 #include <net80211/ieee80211_var.h>
47 #include <net80211/ieee80211_input.h>
48 #include <net80211/ieee80211_regdomain.h>
49 #ifdef IEEE80211_SUPPORT_TDMA
50 #include <net80211/ieee80211_tdma.h>
52 #ifdef IEEE80211_SUPPORT_MESH
53 #include <net80211/ieee80211_mesh.h>
55 #include <net80211/ieee80211_ratectl.h>
60 * Parameters for managing cache entries:
62 * o a station with STA_FAILS_MAX failures is not considered
63 * when picking a candidate
64 * o a station that hasn't had an update in STA_PURGE_SCANS
65 * (background) scans is discarded
66 * o after STA_FAILS_AGE seconds we clear the failure count
68 #define STA_FAILS_MAX 2 /* assoc failures before ignored */
69 #define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */
70 #define STA_PURGE_SCANS 2 /* age for purging entries (scans) */
73 #define STA_RSSI_MIN 8 /* min acceptable rssi */
74 #define STA_RSSI_MAX 40 /* max rssi for comparison */
77 struct ieee80211_scan_entry base;
78 TAILQ_ENTRY(sta_entry) se_list;
79 LIST_ENTRY(sta_entry) se_hash;
80 uint8_t se_fails; /* failure to associate count */
81 uint8_t se_seen; /* seen during current scan */
82 uint8_t se_notseen; /* not seen in previous scans */
84 #define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */
85 uint32_t se_avgrssi; /* LPF rssi state */
86 unsigned long se_lastupdate; /* time of last update */
87 unsigned long se_lastfail; /* time of last failure */
88 unsigned long se_lastassoc; /* time of last association */
89 u_int se_scangen; /* iterator scan gen# */
90 u_int se_countrygen; /* gen# of last cc notify */
93 #define STA_HASHSIZE 32
94 /* simple hash is enough for variation of macaddr */
95 #define STA_HASH(addr) \
96 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE)
98 #define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */
99 CTASSERT(MAX_IEEE_CHAN >= 256);
102 ieee80211_scan_table_lock_t st_lock; /* on scan table */
103 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */
104 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE];
105 ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */
106 u_int st_scaniter; /* gen# for iterator */
107 u_int st_scangen; /* scan generation # */
109 /* ap-related state */
110 int st_maxrssi[MAX_IEEE_CHAN];
113 static void sta_flush_table(struct sta_table *);
115 * match_bss returns a bitmask describing if an entry is suitable
116 * for use. If non-zero the entry was deemed not suitable and it's
117 * contents explains why. The following flags are or'd to to this
118 * mask and can be used to figure out why the entry was rejected.
120 #define MATCH_CHANNEL 0x00001 /* channel mismatch */
121 #define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */
122 #define MATCH_PRIVACY 0x00004 /* privacy mismatch */
123 #define MATCH_RATE 0x00008 /* rate set mismatch */
124 #define MATCH_SSID 0x00010 /* ssid mismatch */
125 #define MATCH_BSSID 0x00020 /* bssid mismatch */
126 #define MATCH_FAILS 0x00040 /* too many failed auth attempts */
127 #define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */
128 #define MATCH_RSSI 0x00100 /* rssi deemed too low to use */
129 #define MATCH_CC 0x00200 /* country code mismatch */
130 #define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */
131 #define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */
132 #define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */
133 #define MATCH_TDMA_LOCAL 0x02000 /* local address */
134 #define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */
135 #define MATCH_MESH_NOID 0x10000 /* no MESHID ie */
136 #define MATCH_MESHID 0x20000 /* meshid mismatch */
137 static int match_bss(struct ieee80211vap *,
138 const struct ieee80211_scan_state *, struct sta_entry *, int);
139 static void adhoc_age(struct ieee80211_scan_state *);
142 isocmp(const uint8_t cc1[], const uint8_t cc2[])
144 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]);
147 /* number of references from net80211 layer */
148 static int nrefs = 0;
152 IEEE80211_SCANNER_MODULE(sta, 1);
155 * Attach prior to any scanning work.
158 sta_attach(struct ieee80211_scan_state *ss)
160 struct sta_table *st;
162 st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table),
164 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
167 IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable");
168 IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen");
169 TAILQ_INIT(&st->st_entry);
171 nrefs++; /* NB: we assume caller locking */
176 * Cleanup any private state.
179 sta_detach(struct ieee80211_scan_state *ss)
181 struct sta_table *st = ss->ss_priv;
185 IEEE80211_SCAN_TABLE_LOCK_DESTROY(st);
186 IEEE80211_SCAN_ITER_LOCK_DESTROY(st);
187 IEEE80211_FREE(st, M_80211_SCAN);
188 KASSERT(nrefs > 0, ("imbalanced attach/detach"));
189 nrefs--; /* NB: we assume caller locking */
195 * Flush all per-scan state.
198 sta_flush(struct ieee80211_scan_state *ss)
200 struct sta_table *st = ss->ss_priv;
202 IEEE80211_SCAN_TABLE_LOCK(st);
204 IEEE80211_SCAN_TABLE_UNLOCK(st);
210 * Flush all entries in the scan cache.
213 sta_flush_table(struct sta_table *st)
215 struct sta_entry *se, *next;
217 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
218 TAILQ_REMOVE(&st->st_entry, se, se_list);
219 LIST_REMOVE(se, se_hash);
220 ieee80211_ies_cleanup(&se->base.se_ies);
221 IEEE80211_FREE(se, M_80211_SCAN);
223 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi));
227 * Process a beacon or probe response frame; create an
228 * entry in the scan cache or update any previous entry.
231 sta_add(struct ieee80211_scan_state *ss,
232 struct ieee80211_channel *curchan,
233 const struct ieee80211_scanparams *sp,
234 const struct ieee80211_frame *wh,
235 int subtype, int rssi, int noise)
237 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
238 #define PICK1ST(_ss) \
239 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \
240 IEEE80211_SCAN_PICK1ST)
241 struct sta_table *st = ss->ss_priv;
242 const uint8_t *macaddr = wh->i_addr2;
243 struct ieee80211vap *vap = ss->ss_vap;
244 struct ieee80211com *ic = vap->iv_ic;
245 struct ieee80211_channel *c;
246 struct sta_entry *se;
247 struct ieee80211_scan_entry *ise;
250 hash = STA_HASH(macaddr);
252 IEEE80211_SCAN_TABLE_LOCK(st);
253 LIST_FOREACH(se, &st->st_hash[hash], se_hash)
254 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr))
256 se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry),
257 M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
259 IEEE80211_SCAN_TABLE_UNLOCK(st);
262 se->se_scangen = st->st_scaniter-1;
263 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
264 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr);
265 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list);
266 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash);
269 /* XXX ap beaconing multiple ssid w/ same bssid */
270 if (sp->ssid[1] != 0 &&
271 (ISPROBE(subtype) || ise->se_ssid[1] == 0))
272 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]);
273 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE,
274 ("rate set too large: %u", sp->rates[1]));
275 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]);
276 if (sp->xrates != NULL) {
277 /* XXX validate xrates[1] */
278 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE,
279 ("xrate set too large: %u", sp->xrates[1]));
280 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]);
282 ise->se_xrates[1] = 0;
283 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3);
284 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) {
286 * Record rssi data using extended precision LPF filter.
288 * NB: use only on-channel data to insure we get a good
289 * estimate of the signal we'll see when associated.
291 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi);
292 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi);
293 ise->se_noise = noise;
295 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp));
296 ise->se_intval = sp->bintval;
297 ise->se_capinfo = sp->capinfo;
298 #ifdef IEEE80211_SUPPORT_MESH
299 if (sp->meshid != NULL && sp->meshid[1] != 0)
300 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]);
303 * Beware of overriding se_chan for frames seen
304 * off-channel; this can cause us to attempt an
305 * association on the wrong channel.
307 if (sp->status & IEEE80211_BPARSE_OFFCHAN) {
309 * Off-channel, locate the home/bss channel for the sta
310 * using the value broadcast in the DSPARMS ie. We know
311 * sp->chan has this value because it's used to calculate
312 * IEEE80211_BPARSE_OFFCHAN.
314 c = ieee80211_find_channel_byieee(ic, sp->chan,
318 } else if (ise->se_chan == NULL) {
319 /* should not happen, pick something */
320 ise->se_chan = curchan;
323 ise->se_chan = curchan;
324 if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) {
325 /* Demote legacy networks to a non-HT channel. */
326 c = ieee80211_find_channel(ic, ise->se_chan->ic_freq,
327 ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT);
329 ("no legacy channel %u", ise->se_chan->ic_ieee));
332 ise->se_fhdwell = sp->fhdwell;
333 ise->se_fhindex = sp->fhindex;
334 ise->se_erp = sp->erp;
335 ise->se_timoff = sp->timoff;
336 if (sp->tim != NULL) {
337 const struct ieee80211_tim_ie *tim =
338 (const struct ieee80211_tim_ie *) sp->tim;
339 ise->se_dtimperiod = tim->tim_period;
341 if (sp->country != NULL) {
342 const struct ieee80211_country_ie *cie =
343 (const struct ieee80211_country_ie *) sp->country;
345 * If 11d is enabled and we're attempting to join a bss
346 * that advertises it's country code then compare our
347 * current settings to what we fetched from the country ie.
348 * If our country code is unspecified or different then
349 * dispatch an event to user space that identifies the
350 * country code so our regdomain config can be changed.
352 /* XXX only for STA mode? */
353 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) ||
354 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) &&
355 (ic->ic_regdomain.country == CTRY_DEFAULT ||
356 !isocmp(cie->cc, ic->ic_regdomain.isocc))) {
357 /* only issue one notify event per scan */
358 if (se->se_countrygen != st->st_scangen) {
359 ieee80211_notify_country(vap, ise->se_bssid,
361 se->se_countrygen = st->st_scangen;
364 ise->se_cc[0] = cie->cc[0];
365 ise->se_cc[1] = cie->cc[1];
367 /* NB: no need to setup ie ptrs; they are not (currently) used */
368 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len);
370 /* clear failure count after STA_FAIL_AGE passes */
371 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) {
373 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr,
374 "%s: fails %u", __func__, se->se_fails);
377 se->se_lastupdate = ticks; /* update time */
381 KASSERT(sizeof(sp->bchan) == 1, ("bchan size"));
382 if (rssi > st->st_maxrssi[sp->bchan])
383 st->st_maxrssi[sp->bchan] = rssi;
385 IEEE80211_SCAN_TABLE_UNLOCK(st);
388 * If looking for a quick choice and nothing's
389 * been found check here.
391 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0)
392 ss->ss_flags |= IEEE80211_SCAN_GOTPICK;
400 * Check if a channel is excluded by user request.
403 isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c)
405 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) ||
406 (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
407 c->ic_freq != vap->iv_des_chan->ic_freq));
410 static struct ieee80211_channel *
411 find11gchannel(struct ieee80211com *ic, int i, int freq)
413 struct ieee80211_channel *c;
417 * The normal ordering in the channel list is b channel
418 * immediately followed by g so optimize the search for
419 * this. We'll still do a full search just in case.
421 for (j = i+1; j < ic->ic_nchans; j++) {
422 c = &ic->ic_channels[j];
423 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c))
426 for (j = 0; j < i; j++) {
427 c = &ic->ic_channels[j];
428 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c))
434 static const u_int chanflags[IEEE80211_MODE_MAX] = {
435 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B,
436 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A,
437 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B,
438 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G,
439 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS,
440 /* check base channel */
441 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A,
442 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G,
443 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST,
444 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF,
445 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER,
447 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A,
448 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G,
452 add_channels(struct ieee80211vap *vap,
453 struct ieee80211_scan_state *ss,
454 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq)
456 struct ieee80211com *ic = vap->iv_ic;
457 struct ieee80211_channel *c, *cg;
461 KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode));
462 modeflags = chanflags[mode];
463 for (i = 0; i < nfreq; i++) {
464 if (ss->ss_last >= IEEE80211_SCAN_MAX)
467 c = ieee80211_find_channel(ic, freq[i], modeflags);
468 if (c == NULL || isexcluded(vap, c))
470 if (mode == IEEE80211_MODE_AUTO) {
472 * XXX special-case 11b/g channels so we select
473 * the g channel if both are present.
475 if (IEEE80211_IS_CHAN_B(c) &&
476 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL)
479 ss->ss_chans[ss->ss_last++] = c;
486 const uint16_t *list;
490 checktable(const struct scanlist *scan, const struct ieee80211_channel *c)
494 for (; scan->list != NULL; scan++) {
495 for (i = 0; i < scan->count; i++)
496 if (scan->list[i] == c->ic_freq)
503 onscanlist(const struct ieee80211_scan_state *ss,
504 const struct ieee80211_channel *c)
508 for (i = 0; i < ss->ss_last; i++)
509 if (ss->ss_chans[i] == c)
515 sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
516 const struct scanlist table[])
518 struct ieee80211com *ic = vap->iv_ic;
519 struct ieee80211_channel *c;
522 for (i = 0; i < ic->ic_nchans; i++) {
523 if (ss->ss_last >= IEEE80211_SCAN_MAX)
526 c = &ic->ic_channels[i];
528 * Ignore dynamic turbo channels; we scan them
529 * in normal mode (i.e. not boosted). Likewise
530 * for HT channels, they get scanned using
533 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c))
537 * If a desired mode was specified, scan only
538 * channels that satisfy that constraint.
540 if (vap->iv_des_mode != IEEE80211_MODE_AUTO &&
541 vap->iv_des_mode != ieee80211_chan2mode(c))
545 * Skip channels excluded by user request.
547 if (isexcluded(vap, c))
551 * Add the channel unless it is listed in the
552 * fixed scan order tables. This insures we
553 * don't sweep back in channels we filtered out
556 if (checktable(table, c))
559 /* Add channel to scanning list. */
560 ss->ss_chans[ss->ss_last++] = c;
563 * Explicitly add any desired channel if:
564 * - not already on the scan list
565 * - allowed by any desired mode constraint
566 * - there is space in the scan list
567 * This allows the channel to be used when the filtering
568 * mechanisms would otherwise elide it (e.g HT, turbo).
570 c = vap->iv_des_chan;
571 if (c != IEEE80211_CHAN_ANYC &&
572 !onscanlist(ss, c) &&
573 (vap->iv_des_mode == IEEE80211_MODE_AUTO ||
574 vap->iv_des_mode == ieee80211_chan2mode(c)) &&
575 ss->ss_last < IEEE80211_SCAN_MAX)
576 ss->ss_chans[ss->ss_last++] = c;
580 makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
581 const struct scanlist table[])
583 const struct scanlist *scan;
584 enum ieee80211_phymode mode;
588 * Use the table of ordered channels to construct the list
589 * of channels for scanning. Any channels in the ordered
590 * list not in the master list will be discarded.
592 for (scan = table; scan->list != NULL; scan++) {
594 if (vap->iv_des_mode != IEEE80211_MODE_AUTO) {
596 * If a desired mode was specified, scan only
597 * channels that satisfy that constraint.
599 if (vap->iv_des_mode != mode) {
601 * The scan table marks 2.4Ghz channels as b
602 * so if the desired mode is 11g, then use
603 * the 11b channel list but upgrade the mode.
605 if (vap->iv_des_mode == IEEE80211_MODE_11G) {
606 if (mode == IEEE80211_MODE_11G) /* Skip the G check */
608 else if (mode == IEEE80211_MODE_11B)
609 mode = IEEE80211_MODE_11G; /* upgrade */
614 * This lets add_channels upgrade an 11b channel
615 * to 11g if available.
617 if (mode == IEEE80211_MODE_11B)
618 mode = IEEE80211_MODE_AUTO;
620 #ifdef IEEE80211_F_XR
621 /* XR does not operate on turbo channels */
622 if ((vap->iv_flags & IEEE80211_F_XR) &&
623 (mode == IEEE80211_MODE_TURBO_A ||
624 mode == IEEE80211_MODE_TURBO_G ||
625 mode == IEEE80211_MODE_STURBO_A))
629 * Add the list of the channels; any that are not
630 * in the master channel list will be discarded.
632 add_channels(vap, ss, mode, scan->list, scan->count);
636 * Add the channels from the ic that are not present
639 sweepchannels(ss, vap, table);
642 static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */
643 { 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 };
644 static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */
645 { 5170, 5190, 5210, 5230 };
646 static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */
647 { 2412, 2437, 2462, 2442, 2472 };
648 static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */
649 { 5745, 5765, 5785, 5805, 5825 };
650 static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */
651 { 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 };
652 static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */
653 { 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 };
654 static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */
656 static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */
657 { 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 };
658 static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */
659 { 5040, 5060, 5080, 4920, 4940, 4960, 4980 };
660 #ifdef ATH_TURBO_SCAN
661 static const uint16_t rcl5[] = /* 3 static turbo channels */
662 { 5210, 5250, 5290 };
663 static const uint16_t rcl6[] = /* 2 static turbo channels */
665 static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */
666 { 5540, 5580, 5620, 5660 };
667 static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */
669 static const uint16_t rcl13[] = /* dynamic Turbo channels */
670 { 5200, 5240, 5280, 5765, 5805 };
671 #endif /* ATH_TURBO_SCAN */
673 #define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a
675 static const struct scanlist staScanTable[] = {
676 { IEEE80211_MODE_11B, X(rcl3) },
677 { IEEE80211_MODE_11A, X(rcl1) },
678 { IEEE80211_MODE_11A, X(rcl2) },
679 { IEEE80211_MODE_11B, X(rcl8) },
680 { IEEE80211_MODE_11B, X(rcl9) },
681 { IEEE80211_MODE_11A, X(rcl4) },
682 #ifdef ATH_TURBO_SCAN
683 { IEEE80211_MODE_STURBO_A, X(rcl5) },
684 { IEEE80211_MODE_STURBO_A, X(rcl6) },
685 { IEEE80211_MODE_TURBO_A, X(rcl6x) },
686 { IEEE80211_MODE_TURBO_A, X(rcl13) },
687 #endif /* ATH_TURBO_SCAN */
688 { IEEE80211_MODE_11A, X(rcl7) },
689 { IEEE80211_MODE_11B, X(rcl10) },
690 { IEEE80211_MODE_11A, X(rcl11) },
691 #ifdef ATH_TURBO_SCAN
692 { IEEE80211_MODE_TURBO_G, X(rcl12) },
693 #endif /* ATH_TURBO_SCAN */
698 * Start a station-mode scan by populating the channel list.
701 sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
703 struct sta_table *st = ss->ss_priv;
705 makescanlist(ss, vap, staScanTable);
707 if (ss->ss_mindwell == 0)
708 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */
709 if (ss->ss_maxdwell == 0)
710 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
719 * Restart a scan, typically a bg scan but can
720 * also be a fg scan that came up empty.
723 sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
725 struct sta_table *st = ss->ss_priv;
732 * Cancel an ongoing scan.
735 sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
740 /* unaligned little endian access */
741 #define LE_READ_2(p) \
743 ((((const uint8_t *)(p))[0] ) | \
744 (((const uint8_t *)(p))[1] << 8)))
747 * Demote any supplied 11g channel to 11b. There should
748 * always be an 11b channel but we check anyway...
750 static struct ieee80211_channel *
751 demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan)
753 struct ieee80211_channel *c;
755 if (IEEE80211_IS_CHAN_ANYG(chan) &&
756 vap->iv_des_mode == IEEE80211_MODE_AUTO) {
757 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq,
758 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) |
767 maxrate(const struct ieee80211_scan_entry *se)
769 const struct ieee80211_ie_htcap *htcap =
770 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie;
771 int rmax, r, i, txstream;
778 * HT station; inspect supported MCS and then adjust
779 * rate by channel width.
781 txparams = htcap->hc_mcsset[12];
782 if (txparams & 0x3) {
784 * TX MCS parameters defined and not equal to RX,
785 * extract the number of spartial streams and
786 * map it to the highest MCS rate.
788 txstream = ((txparams & 0xc) >> 2) + 1;
789 i = txstream * 8 - 1;
791 for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--);
793 caps = LE_READ_2(&htcap->hc_cap);
794 if ((caps & IEEE80211_HTCAP_CHWIDTH40) &&
795 (caps & IEEE80211_HTCAP_SHORTGI40))
796 rmax = ieee80211_htrates[i].ht40_rate_400ns;
797 else if (caps & IEEE80211_HTCAP_CHWIDTH40)
798 rmax = ieee80211_htrates[i].ht40_rate_800ns;
799 else if (caps & IEEE80211_HTCAP_SHORTGI20)
800 rmax = ieee80211_htrates[i].ht20_rate_400ns;
802 rmax = ieee80211_htrates[i].ht20_rate_800ns;
805 for (i = 0; i < se->se_rates[1]; i++) {
806 r = se->se_rates[2+i] & IEEE80211_RATE_VAL;
810 for (i = 0; i < se->se_xrates[1]; i++) {
811 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL;
819 * Compare the capabilities of two entries and decide which is
820 * more desirable (return >0 if a is considered better). Note
821 * that we assume compatibility/usability has already been checked
822 * so we don't need to (e.g. validate whether privacy is supported).
823 * Used to select the best scan candidate for association in a BSS.
826 sta_compare(const struct sta_entry *a, const struct sta_entry *b)
828 #define PREFER(_a,_b,_what) do { \
829 if (((_a) ^ (_b)) & (_what)) \
830 return ((_a) & (_what)) ? 1 : -1; \
836 /* privacy support */
837 PREFER(a->base.se_capinfo, b->base.se_capinfo,
838 IEEE80211_CAPINFO_PRIVACY);
840 /* compare count of previous failures */
841 weight = b->se_fails - a->se_fails;
846 * Compare rssi. If the two are considered equivalent
847 * then fallback to other criteria. We threshold the
848 * comparisons to avoid selecting an ap purely by rssi
849 * when both values may be good but one ap is otherwise
850 * more desirable (e.g. an 11b-only ap with stronger
851 * signal than an 11g ap).
853 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX);
854 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX);
855 if (abs(rssib - rssia) < 5) {
856 /* best/max rate preferred if signal level close enough XXX */
857 maxa = maxrate(&a->base);
858 maxb = maxrate(&b->base);
861 /* XXX use freq for channel preference */
862 /* for now just prefer 5Ghz band to all other bands */
863 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan),
864 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1);
866 /* all things being equal, use signal level */
867 return a->base.se_rssi - b->base.se_rssi;
872 * Check rate set suitability and return the best supported rate.
873 * XXX inspect MCS for HT
876 check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan,
877 const struct ieee80211_scan_entry *se)
879 #define RV(v) ((v) & IEEE80211_RATE_VAL)
880 const struct ieee80211_rateset *srs;
881 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate;
884 okrate = badrate = 0;
886 srs = ieee80211_get_suprates(vap->iv_ic, chan);
887 nrs = se->se_rates[1];
890 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate;
891 fixedrate = IEEE80211_FIXED_RATE_NONE;
893 for (i = 0; i < nrs; i++) {
897 * Check any fixed rate is included.
902 * Check against our supported rates.
904 for (j = 0; j < srs->rs_nrates; j++)
905 if (r == RV(srs->rs_rates[j])) {
906 if (r > okrate) /* NB: track max */
911 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) {
913 * Don't try joining a BSS, if we don't support
914 * one of its basic rates.
920 if (rs == se->se_rates+2) {
921 /* scan xrates too; sort of an algol68-style for loop */
922 nrs = se->se_xrates[1];
923 rs = se->se_xrates+2;
928 if (okrate == 0 || ucastrate != fixedrate)
929 return badrate | IEEE80211_RATE_BASIC;
936 match_id(const uint8_t *ie, const uint8_t *val, int len)
938 return (ie[1] == len && memcmp(ie+2, val, len) == 0);
942 match_ssid(const uint8_t *ie,
943 int nssid, const struct ieee80211_scan_ssid ssids[])
947 for (i = 0; i < nssid; i++) {
948 if (match_id(ie, ssids[i].ssid, ssids[i].len))
954 #ifdef IEEE80211_SUPPORT_TDMA
956 tdma_isfull(const struct ieee80211_tdma_param *tdma)
960 slotcnt = tdma->tdma_slotcnt;
961 for (slot = slotcnt-1; slot >= 0; slot--)
962 if (isclr(tdma->tdma_inuse, slot))
966 #endif /* IEEE80211_SUPPORT_TDMA */
969 * Test a scan candidate for suitability/compatibility.
972 match_bss(struct ieee80211vap *vap,
973 const struct ieee80211_scan_state *ss, struct sta_entry *se0,
976 struct ieee80211com *ic = vap->iv_ic;
977 struct ieee80211_scan_entry *se = &se0->base;
982 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan)))
983 fail |= MATCH_CHANNEL;
985 * NB: normally the desired mode is used to construct
986 * the channel list, but it's possible for the scan
987 * cache to include entries for stations outside this
988 * list so we check the desired mode here to weed them
991 if (vap->iv_des_mode != IEEE80211_MODE_AUTO &&
992 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
993 chanflags[vap->iv_des_mode])
994 fail |= MATCH_CHANNEL;
995 if (vap->iv_opmode == IEEE80211_M_IBSS) {
996 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
997 fail |= MATCH_CAPINFO;
998 #ifdef IEEE80211_SUPPORT_TDMA
999 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
1001 * Adhoc demo network setup shouldn't really be scanning
1002 * but just in case skip stations operating in IBSS or
1005 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS))
1006 fail |= MATCH_CAPINFO;
1008 * TDMA operation cannot coexist with a normal 802.11 network;
1009 * skip if IBSS or ESS capabilities are marked and require
1010 * the beacon have a TDMA ie present.
1012 if (vap->iv_caps & IEEE80211_C_TDMA) {
1013 const struct ieee80211_tdma_param *tdma =
1014 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie;
1015 const struct ieee80211_tdma_state *ts = vap->iv_tdma;
1018 fail |= MATCH_TDMA_NOIE;
1019 else if (tdma->tdma_version != ts->tdma_version)
1020 fail |= MATCH_TDMA_VERSION;
1021 else if (tdma->tdma_slot != 0)
1022 fail |= MATCH_TDMA_NOTMASTER;
1023 else if (tdma_isfull(tdma))
1024 fail |= MATCH_TDMA_NOSLOT;
1026 else if (ieee80211_local_address(se->se_macaddr))
1027 fail |= MATCH_TDMA_LOCAL;
1030 #endif /* IEEE80211_SUPPORT_TDMA */
1031 #ifdef IEEE80211_SUPPORT_MESH
1032 } else if (vap->iv_opmode == IEEE80211_M_MBSS) {
1033 const struct ieee80211_mesh_state *ms = vap->iv_mesh;
1035 * Mesh nodes have IBSS & ESS bits in capinfo turned off
1036 * and two special ie's that must be present.
1038 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS))
1039 fail |= MATCH_CAPINFO;
1040 else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID)
1041 fail |= MATCH_MESH_NOID;
1042 else if (ms->ms_idlen != 0 &&
1043 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen))
1044 fail |= MATCH_MESHID;
1047 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0)
1048 fail |= MATCH_CAPINFO;
1050 * If 11d is enabled and we're attempting to join a bss
1051 * that advertises it's country code then compare our
1052 * current settings to what we fetched from the country ie.
1053 * If our country code is unspecified or different then do
1054 * not attempt to join the bss. We should have already
1055 * dispatched an event to user space that identifies the
1056 * new country code so our regdomain config should match.
1058 if ((IEEE80211_IS_CHAN_11D(se->se_chan) ||
1059 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) &&
1060 se->se_cc[0] != 0 &&
1061 (ic->ic_regdomain.country == CTRY_DEFAULT ||
1062 !isocmp(se->se_cc, ic->ic_regdomain.isocc)))
1065 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1066 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
1067 fail |= MATCH_PRIVACY;
1069 /* XXX does this mean privacy is supported or required? */
1070 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY)
1071 fail |= MATCH_PRIVACY;
1073 se0->se_flags &= ~STA_DEMOTE11B;
1074 rate = check_rate(vap, se->se_chan, se);
1075 if (rate & IEEE80211_RATE_BASIC) {
1078 * An 11b-only ap will give a rate mismatch if there is an
1079 * OFDM fixed tx rate for 11g. Try downgrading the channel
1080 * in the scan list to 11b and retry the rate check.
1082 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) {
1083 rate = check_rate(vap, demote11b(vap, se->se_chan), se);
1084 if ((rate & IEEE80211_RATE_BASIC) == 0) {
1085 fail &= ~MATCH_RATE;
1086 se0->se_flags |= STA_DEMOTE11B;
1089 } else if (rate < 2*24) {
1091 * This is an 11b-only ap. Check the desired mode in
1092 * case that needs to be honored (mode 11g filters out
1093 * 11b-only ap's). Otherwise force any 11g channel used
1094 * in scanning to be demoted.
1096 * NB: we cheat a bit here by looking at the max rate;
1097 * we could/should check the rates.
1099 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO ||
1100 vap->iv_des_mode == IEEE80211_MODE_11B))
1103 se0->se_flags |= STA_DEMOTE11B;
1105 if (ss->ss_nssid != 0 &&
1106 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid))
1108 if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
1109 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid))
1110 fail |= MATCH_BSSID;
1111 if (se0->se_fails >= STA_FAILS_MAX)
1112 fail |= MATCH_FAILS;
1113 if (se0->se_notseen >= STA_PURGE_SCANS)
1114 fail |= MATCH_NOTSEEN;
1115 if (se->se_rssi < STA_RSSI_MIN)
1117 #ifdef IEEE80211_DEBUG
1118 if (ieee80211_msg(vap, debug)) {
1120 fail & MATCH_FAILS ? '=' :
1121 fail & MATCH_NOTSEEN ? '^' :
1122 fail & MATCH_CC ? '$' :
1123 #ifdef IEEE80211_SUPPORT_TDMA
1124 fail & MATCH_TDMA_NOIE ? '&' :
1125 fail & MATCH_TDMA_VERSION ? 'v' :
1126 fail & MATCH_TDMA_NOTMASTER ? 's' :
1127 fail & MATCH_TDMA_NOSLOT ? 'f' :
1128 fail & MATCH_TDMA_LOCAL ? 'l' :
1130 fail & MATCH_MESH_NOID ? 'm' :
1131 fail ? '-' : '+', ether_sprintf(se->se_macaddr));
1132 printf(" %s%c", ether_sprintf(se->se_bssid),
1133 fail & MATCH_BSSID ? '!' : ' ');
1134 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan),
1135 fail & MATCH_CHANNEL ? '!' : ' ');
1136 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' ');
1137 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
1138 fail & MATCH_RATE ? '!' : ' ');
1140 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
1141 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "",
1142 fail & MATCH_CAPINFO ? '!' : ' ');
1144 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
1146 fail & MATCH_PRIVACY ? '!' : ' ');
1147 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]);
1148 printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : "");
1155 sta_update_notseen(struct sta_table *st)
1157 struct sta_entry *se;
1159 IEEE80211_SCAN_TABLE_LOCK(st);
1160 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1162 * If seen the reset and don't bump the count;
1163 * otherwise bump the ``not seen'' count. Note
1164 * that this insures that stations for which we
1165 * see frames while not scanning but not during
1166 * this scan will not be penalized.
1173 IEEE80211_SCAN_TABLE_UNLOCK(st);
1177 sta_dec_fails(struct sta_table *st)
1179 struct sta_entry *se;
1181 IEEE80211_SCAN_TABLE_LOCK(st);
1182 TAILQ_FOREACH(se, &st->st_entry, se_list)
1185 IEEE80211_SCAN_TABLE_UNLOCK(st);
1188 static struct sta_entry *
1189 select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug)
1191 struct sta_table *st = ss->ss_priv;
1192 struct sta_entry *se, *selbs = NULL;
1194 IEEE80211_DPRINTF(vap, debug, " %s\n",
1195 "macaddr bssid chan rssi rate flag wep essid");
1196 IEEE80211_SCAN_TABLE_LOCK(st);
1197 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1198 ieee80211_ies_expand(&se->base.se_ies);
1199 if (match_bss(vap, ss, se, debug) == 0) {
1202 else if (sta_compare(se, selbs) > 0)
1206 IEEE80211_SCAN_TABLE_UNLOCK(st);
1212 * Pick an ap or ibss network to join or find a channel
1213 * to use to start an ibss network.
1216 sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1218 struct sta_table *st = ss->ss_priv;
1219 struct sta_entry *selbs;
1220 struct ieee80211_channel *chan;
1222 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1223 ("wrong mode %u", vap->iv_opmode));
1225 if (st->st_newscan) {
1226 sta_update_notseen(st);
1229 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1231 * Manual/background scan, don't select+join the
1232 * bss, just return. The scanning framework will
1233 * handle notification that this has completed.
1235 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1239 * Automatic sequencing; look for a candidate and
1240 * if found join the network.
1242 /* NB: unlocked read should be ok */
1243 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1244 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1245 "%s: no scan candidate\n", __func__);
1246 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1250 * If nothing suitable was found decrement
1251 * the failure counts so entries will be
1252 * reconsidered the next time around. We
1253 * really want to do this only for sta's
1254 * where we've previously had some success.
1258 return 0; /* restart scan */
1260 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1261 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1262 return (selbs != NULL);
1265 chan = selbs->base.se_chan;
1266 if (selbs->se_flags & STA_DEMOTE11B)
1267 chan = demote11b(vap, chan);
1268 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1270 return 1; /* terminate scan */
1274 * Lookup an entry in the scan cache. We assume we're
1275 * called from the bottom half or such that we don't need
1276 * to block the bottom half so that it's safe to return
1277 * a reference to an entry w/o holding the lock on the table.
1279 static struct sta_entry *
1280 sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN])
1282 struct sta_entry *se;
1283 int hash = STA_HASH(macaddr);
1285 IEEE80211_SCAN_TABLE_LOCK(st);
1286 LIST_FOREACH(se, &st->st_hash[hash], se_hash)
1287 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr))
1289 IEEE80211_SCAN_TABLE_UNLOCK(st);
1291 return se; /* NB: unlocked */
1295 sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1297 struct ieee80211com *ic = vap->iv_ic;
1298 struct ieee80211_node *ni = vap->iv_bss;
1299 struct sta_table *st = ss->ss_priv;
1300 enum ieee80211_phymode mode;
1301 struct sta_entry *se, *selbs;
1302 uint8_t roamRate, curRate, ucastRate;
1303 int8_t roamRssi, curRssi;
1305 se = sta_lookup(st, ni->ni_macaddr);
1307 /* XXX something is wrong */
1311 mode = ieee80211_chan2mode(ic->ic_bsschan);
1312 roamRate = vap->iv_roamparms[mode].rate;
1313 roamRssi = vap->iv_roamparms[mode].rssi;
1314 ucastRate = vap->iv_txparms[mode].ucastrate;
1315 /* NB: the most up to date rssi is in the node, not the scan cache */
1316 curRssi = ic->ic_node_getrssi(ni);
1317 if (ucastRate == IEEE80211_FIXED_RATE_NONE) {
1318 curRate = ni->ni_txrate;
1319 roamRate &= IEEE80211_RATE_VAL;
1320 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
1321 "%s: currssi %d currate %u roamrssi %d roamrate %u\n",
1322 __func__, curRssi, curRate, roamRssi, roamRate);
1324 curRate = roamRate; /* NB: insure compare below fails */
1325 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
1326 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi);
1329 * Check if a new ap should be used and switch.
1330 * XXX deauth current ap
1332 if (curRate < roamRate || curRssi < roamRssi) {
1333 if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) {
1335 * Scan cache contents are too old; force a scan now
1336 * if possible so we have current state to make a
1337 * decision with. We don't kick off a bg scan if
1338 * we're using dynamic turbo and boosted or if the
1340 * XXX force immediate switch on scan complete
1342 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1343 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))
1344 ieee80211_bg_scan(vap, 0);
1347 se->base.se_rssi = curRssi;
1348 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM);
1349 if (selbs != NULL && selbs != se) {
1350 struct ieee80211_channel *chan;
1352 IEEE80211_DPRINTF(vap,
1353 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG,
1354 "%s: ROAM: curRate %u, roamRate %u, "
1355 "curRssi %d, roamRssi %d\n", __func__,
1356 curRate, roamRate, curRssi, roamRssi);
1358 chan = selbs->base.se_chan;
1359 if (selbs->se_flags & STA_DEMOTE11B)
1360 chan = demote11b(vap, chan);
1361 (void) ieee80211_sta_join(vap, chan, &selbs->base);
1367 * Age entries in the scan cache.
1368 * XXX also do roaming since it's convenient
1371 sta_age(struct ieee80211_scan_state *ss)
1373 struct ieee80211vap *vap = ss->ss_vap;
1377 * If rate control is enabled check periodically to see if
1378 * we should roam from our current connection to one that
1379 * might be better. This only applies when we're operating
1380 * in sta mode and automatic roaming is set.
1382 * XXX repeater station
1383 * XXX do when !bgscan?
1385 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1386 ("wrong mode %u", vap->iv_opmode));
1387 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO &&
1388 (vap->iv_flags & IEEE80211_F_BGSCAN) &&
1389 vap->iv_state >= IEEE80211_S_RUN)
1390 /* XXX vap is implicit */
1391 sta_roam_check(ss, vap);
1395 * Iterate over the entries in the scan cache, invoking
1396 * the callback function on each one.
1399 sta_iterate(struct ieee80211_scan_state *ss,
1400 ieee80211_scan_iter_func *f, void *arg)
1402 struct sta_table *st = ss->ss_priv;
1403 struct sta_entry *se;
1406 IEEE80211_SCAN_ITER_LOCK(st);
1407 gen = st->st_scaniter++;
1409 IEEE80211_SCAN_TABLE_LOCK(st);
1410 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1411 if (se->se_scangen != gen) {
1412 se->se_scangen = gen;
1413 /* update public state */
1414 se->base.se_age = ticks - se->se_lastupdate;
1415 IEEE80211_SCAN_TABLE_UNLOCK(st);
1416 (*f)(arg, &se->base);
1420 IEEE80211_SCAN_TABLE_UNLOCK(st);
1422 IEEE80211_SCAN_ITER_UNLOCK(st);
1426 sta_assoc_fail(struct ieee80211_scan_state *ss,
1427 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason)
1429 struct sta_table *st = ss->ss_priv;
1430 struct sta_entry *se;
1432 se = sta_lookup(st, macaddr);
1435 se->se_lastfail = ticks;
1436 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
1437 macaddr, "%s: reason %u fails %u",
1438 __func__, reason, se->se_fails);
1443 sta_assoc_success(struct ieee80211_scan_state *ss,
1444 const uint8_t macaddr[IEEE80211_ADDR_LEN])
1446 struct sta_table *st = ss->ss_priv;
1447 struct sta_entry *se;
1449 se = sta_lookup(st, macaddr);
1453 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
1454 macaddr, "%s: fails %u",
1455 __func__, se->se_fails);
1457 se->se_lastassoc = ticks;
1461 static const struct ieee80211_scanner sta_default = {
1462 .scan_name = "default",
1463 .scan_attach = sta_attach,
1464 .scan_detach = sta_detach,
1465 .scan_start = sta_start,
1466 .scan_restart = sta_restart,
1467 .scan_cancel = sta_cancel,
1468 .scan_end = sta_pick_bss,
1469 .scan_flush = sta_flush,
1470 .scan_add = sta_add,
1471 .scan_age = sta_age,
1472 .scan_iterate = sta_iterate,
1473 .scan_assoc_fail = sta_assoc_fail,
1474 .scan_assoc_success = sta_assoc_success,
1476 IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default);
1479 * Adhoc mode-specific support.
1482 static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */
1483 { 5180, 5200, 5220, 5240 };
1484 static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */
1485 { 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 };
1486 static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */
1487 { 5170, 5190, 5210, 5230 };
1488 static const uint16_t adhoc11b[] = /* 10, 11 */
1491 static const struct scanlist adhocScanTable[] = {
1492 { IEEE80211_MODE_11B, X(adhoc11b) },
1493 { IEEE80211_MODE_11A, X(adhocWorld) },
1494 { IEEE80211_MODE_11A, X(adhocFcc3) },
1495 { IEEE80211_MODE_11B, X(adhocMkk) },
1501 * Start an adhoc-mode scan by populating the channel list.
1504 adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1506 struct sta_table *st = ss->ss_priv;
1508 makescanlist(ss, vap, adhocScanTable);
1510 if (ss->ss_mindwell == 0)
1511 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */
1512 if (ss->ss_maxdwell == 0)
1513 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
1522 * Select a channel to start an adhoc network on.
1523 * The channel list was populated with appropriate
1524 * channels so select one that looks least occupied.
1526 static struct ieee80211_channel *
1527 adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags)
1529 struct sta_table *st = ss->ss_priv;
1530 struct sta_entry *se;
1531 struct ieee80211_channel *c, *bestchan;
1532 int i, bestrssi, maxrssi;
1537 IEEE80211_SCAN_TABLE_LOCK(st);
1538 for (i = 0; i < ss->ss_last; i++) {
1539 c = ss->ss_chans[i];
1540 /* never consider a channel with radar */
1541 if (IEEE80211_IS_CHAN_RADAR(c))
1543 /* skip channels disallowed by regulatory settings */
1544 if (IEEE80211_IS_CHAN_NOADHOC(c))
1546 /* check channel attributes for band compatibility */
1547 if (flags != 0 && (c->ic_flags & flags) != flags)
1550 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1551 if (se->base.se_chan != c)
1553 if (se->base.se_rssi > maxrssi)
1554 maxrssi = se->base.se_rssi;
1556 if (bestchan == NULL || maxrssi < bestrssi)
1559 IEEE80211_SCAN_TABLE_UNLOCK(st);
1565 * Pick an ibss network to join or find a channel
1566 * to use to start an ibss network.
1569 adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1571 struct sta_table *st = ss->ss_priv;
1572 struct sta_entry *selbs;
1573 struct ieee80211_channel *chan;
1574 struct ieee80211com *ic = vap->iv_ic;
1576 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS ||
1577 vap->iv_opmode == IEEE80211_M_AHDEMO ||
1578 vap->iv_opmode == IEEE80211_M_MBSS,
1579 ("wrong opmode %u", vap->iv_opmode));
1581 if (st->st_newscan) {
1582 sta_update_notseen(st);
1585 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1587 * Manual/background scan, don't select+join the
1588 * bss, just return. The scanning framework will
1589 * handle notification that this has completed.
1591 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1595 * Automatic sequencing; look for a candidate and
1596 * if found join the network.
1598 /* NB: unlocked read should be ok */
1599 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1600 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1601 "%s: no scan candidate\n", __func__);
1602 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1605 /* NB: never auto-start a tdma network for slot !0 */
1606 #ifdef IEEE80211_SUPPORT_TDMA
1607 if (vap->iv_des_nssid &&
1608 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 ||
1609 ieee80211_tdma_getslot(vap) == 0)) {
1611 if (vap->iv_des_nssid) {
1614 * No existing adhoc network to join and we have
1615 * an ssid; start one up. If no channel was
1616 * specified, try to select a channel.
1618 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC ||
1619 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
1620 chan = adhoc_pick_channel(ss, 0);
1622 chan = vap->iv_des_chan;
1624 struct ieee80211com *ic = vap->iv_ic;
1626 * Create a HT capable IBSS; the per-node
1627 * probe request/response will result in
1628 * "correct" rate control capabilities being
1631 chan = ieee80211_ht_adjust_channel(ic,
1632 chan, vap->iv_flags_ht);
1633 ieee80211_create_ibss(vap, chan);
1638 * If nothing suitable was found decrement
1639 * the failure counts so entries will be
1640 * reconsidered the next time around. We
1641 * really want to do this only for sta's
1642 * where we've previously had some success.
1646 return 0; /* restart scan */
1648 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1649 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1650 return (selbs != NULL);
1653 chan = selbs->base.se_chan;
1654 if (selbs->se_flags & STA_DEMOTE11B)
1655 chan = demote11b(vap, chan);
1657 * If HT is available, make it a possibility here.
1658 * The intent is to enable HT20/HT40 when joining a non-HT
1659 * IBSS node; we can then advertise HT IEs and speak HT
1660 * to any subsequent nodes that support it.
1662 chan = ieee80211_ht_adjust_channel(ic,
1663 chan, vap->iv_flags_ht);
1664 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1666 return 1; /* terminate scan */
1670 * Age entries in the scan cache.
1673 adhoc_age(struct ieee80211_scan_state *ss)
1675 struct sta_table *st = ss->ss_priv;
1676 struct sta_entry *se, *next;
1678 IEEE80211_SCAN_TABLE_LOCK(st);
1679 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
1680 if (se->se_notseen > STA_PURGE_SCANS) {
1681 TAILQ_REMOVE(&st->st_entry, se, se_list);
1682 LIST_REMOVE(se, se_hash);
1683 ieee80211_ies_cleanup(&se->base.se_ies);
1684 IEEE80211_FREE(se, M_80211_SCAN);
1687 IEEE80211_SCAN_TABLE_UNLOCK(st);
1690 static const struct ieee80211_scanner adhoc_default = {
1691 .scan_name = "default",
1692 .scan_attach = sta_attach,
1693 .scan_detach = sta_detach,
1694 .scan_start = adhoc_start,
1695 .scan_restart = sta_restart,
1696 .scan_cancel = sta_cancel,
1697 .scan_end = adhoc_pick_bss,
1698 .scan_flush = sta_flush,
1699 .scan_pickchan = adhoc_pick_channel,
1700 .scan_add = sta_add,
1701 .scan_age = adhoc_age,
1702 .scan_iterate = sta_iterate,
1703 .scan_assoc_fail = sta_assoc_fail,
1704 .scan_assoc_success = sta_assoc_success,
1706 IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default);
1707 IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default);
1710 ap_force_promisc(struct ieee80211com *ic)
1712 struct ifnet *ifp = ic->ic_ifp;
1715 /* set interface into promiscuous mode */
1716 ifp->if_flags |= IFF_PROMISC;
1717 ieee80211_runtask(ic, &ic->ic_promisc_task);
1718 IEEE80211_UNLOCK(ic);
1722 ap_reset_promisc(struct ieee80211com *ic)
1725 ieee80211_syncifflag_locked(ic, IFF_PROMISC);
1726 IEEE80211_UNLOCK(ic);
1730 ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1732 struct sta_table *st = ss->ss_priv;
1734 makescanlist(ss, vap, staScanTable);
1736 if (ss->ss_mindwell == 0)
1737 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */
1738 if (ss->ss_maxdwell == 0)
1739 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
1744 ap_force_promisc(vap->iv_ic);
1749 * Cancel an ongoing scan.
1752 ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1754 ap_reset_promisc(vap->iv_ic);
1759 * Pick a quiet channel to use for ap operation.
1761 static struct ieee80211_channel *
1762 ap_pick_channel(struct ieee80211_scan_state *ss, int flags)
1764 struct sta_table *st = ss->ss_priv;
1765 struct ieee80211_channel *bestchan = NULL;
1768 /* XXX select channel more intelligently, e.g. channel spread, power */
1769 /* NB: use scan list order to preserve channel preference */
1770 for (i = 0; i < ss->ss_last; i++) {
1771 struct ieee80211_channel *chan = ss->ss_chans[i];
1773 * If the channel is unoccupied the max rssi
1774 * should be zero; just take it. Otherwise
1775 * track the channel with the lowest rssi and
1776 * use that when all channels appear occupied.
1778 if (IEEE80211_IS_CHAN_RADAR(chan))
1780 if (IEEE80211_IS_CHAN_NOHOSTAP(chan))
1782 /* check channel attributes for band compatibility */
1783 if (flags != 0 && (chan->ic_flags & flags) != flags)
1785 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size"));
1786 /* XXX channel have interference */
1787 if (st->st_maxrssi[chan->ic_ieee] == 0) {
1788 /* XXX use other considerations */
1791 if (bestchan == NULL ||
1792 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee])
1799 * Pick a quiet channel to use for ap operation.
1802 ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1804 struct ieee80211com *ic = vap->iv_ic;
1805 struct ieee80211_channel *bestchan;
1807 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
1808 ("wrong opmode %u", vap->iv_opmode));
1809 bestchan = ap_pick_channel(ss, 0);
1810 if (bestchan == NULL) {
1811 /* no suitable channel, should not happen */
1812 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1813 "%s: no suitable channel! (should not happen)\n", __func__);
1814 /* XXX print something? */
1815 return 0; /* restart scan */
1818 * If this is a dynamic turbo channel, start with the unboosted one.
1820 if (IEEE80211_IS_CHAN_TURBO(bestchan)) {
1821 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq,
1822 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO);
1823 if (bestchan == NULL) {
1824 /* should never happen ?? */
1828 ap_reset_promisc(ic);
1829 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) {
1831 * Manual/background scan, don't select+join the
1832 * bss, just return. The scanning framework will
1833 * handle notification that this has completed.
1835 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1838 ieee80211_create_ibss(vap,
1839 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht));
1843 static const struct ieee80211_scanner ap_default = {
1844 .scan_name = "default",
1845 .scan_attach = sta_attach,
1846 .scan_detach = sta_detach,
1847 .scan_start = ap_start,
1848 .scan_restart = sta_restart,
1849 .scan_cancel = ap_cancel,
1851 .scan_flush = sta_flush,
1852 .scan_pickchan = ap_pick_channel,
1853 .scan_add = sta_add,
1854 .scan_age = adhoc_age,
1855 .scan_iterate = sta_iterate,
1856 .scan_assoc_success = sta_assoc_success,
1857 .scan_assoc_fail = sta_assoc_fail,
1859 IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default);
1861 #ifdef IEEE80211_SUPPORT_MESH
1863 * Pick an mbss network to join or find a channel
1864 * to use to start an mbss network.
1867 mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1869 struct sta_table *st = ss->ss_priv;
1870 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1871 struct sta_entry *selbs;
1872 struct ieee80211_channel *chan;
1874 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1875 ("wrong opmode %u", vap->iv_opmode));
1877 if (st->st_newscan) {
1878 sta_update_notseen(st);
1881 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1883 * Manual/background scan, don't select+join the
1884 * bss, just return. The scanning framework will
1885 * handle notification that this has completed.
1887 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1891 * Automatic sequencing; look for a candidate and
1892 * if found join the network.
1894 /* NB: unlocked read should be ok */
1895 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1896 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1897 "%s: no scan candidate\n", __func__);
1898 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1901 if (ms->ms_idlen != 0) {
1903 * No existing mbss network to join and we have
1904 * a meshid; start one up. If no channel was
1905 * specified, try to select a channel.
1907 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC ||
1908 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
1909 struct ieee80211com *ic = vap->iv_ic;
1911 chan = adhoc_pick_channel(ss, 0);
1913 chan = ieee80211_ht_adjust_channel(ic,
1914 chan, vap->iv_flags_ht);
1916 chan = vap->iv_des_chan;
1918 ieee80211_create_ibss(vap, chan);
1923 * If nothing suitable was found decrement
1924 * the failure counts so entries will be
1925 * reconsidered the next time around. We
1926 * really want to do this only for sta's
1927 * where we've previously had some success.
1931 return 0; /* restart scan */
1933 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1934 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1935 return (selbs != NULL);
1938 chan = selbs->base.se_chan;
1939 if (selbs->se_flags & STA_DEMOTE11B)
1940 chan = demote11b(vap, chan);
1941 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1943 return 1; /* terminate scan */
1946 static const struct ieee80211_scanner mesh_default = {
1947 .scan_name = "default",
1948 .scan_attach = sta_attach,
1949 .scan_detach = sta_detach,
1950 .scan_start = adhoc_start,
1951 .scan_restart = sta_restart,
1952 .scan_cancel = sta_cancel,
1953 .scan_end = mesh_pick_bss,
1954 .scan_flush = sta_flush,
1955 .scan_pickchan = adhoc_pick_channel,
1956 .scan_add = sta_add,
1957 .scan_age = adhoc_age,
1958 .scan_iterate = sta_iterate,
1959 .scan_assoc_fail = sta_assoc_fail,
1960 .scan_assoc_success = sta_assoc_success,
1962 IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default);
1963 #endif /* IEEE80211_SUPPORT_MESH */