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/malloc.h>
38 #include <sys/module.h>
40 #include <sys/socket.h>
43 #include <net/if_var.h>
44 #include <net/if_media.h>
45 #include <net/ethernet.h>
47 #include <net80211/ieee80211_var.h>
48 #include <net80211/ieee80211_input.h>
49 #include <net80211/ieee80211_regdomain.h>
50 #ifdef IEEE80211_SUPPORT_TDMA
51 #include <net80211/ieee80211_tdma.h>
53 #ifdef IEEE80211_SUPPORT_MESH
54 #include <net80211/ieee80211_mesh.h>
56 #include <net80211/ieee80211_ratectl.h>
61 * Parameters for managing cache entries:
63 * o a station with STA_FAILS_MAX failures is not considered
64 * when picking a candidate
65 * o a station that hasn't had an update in STA_PURGE_SCANS
66 * (background) scans is discarded
67 * o after STA_FAILS_AGE seconds we clear the failure count
69 #define STA_FAILS_MAX 2 /* assoc failures before ignored */
70 #define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */
71 #define STA_PURGE_SCANS 2 /* age for purging entries (scans) */
74 #define STA_RSSI_MIN 8 /* min acceptable rssi */
75 #define STA_RSSI_MAX 40 /* max rssi for comparison */
78 struct ieee80211_scan_entry base;
79 TAILQ_ENTRY(sta_entry) se_list;
80 LIST_ENTRY(sta_entry) se_hash;
81 uint8_t se_fails; /* failure to associate count */
82 uint8_t se_seen; /* seen during current scan */
83 uint8_t se_notseen; /* not seen in previous scans */
85 #define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */
86 uint32_t se_avgrssi; /* LPF rssi state */
87 unsigned long se_lastupdate; /* time of last update */
88 unsigned long se_lastfail; /* time of last failure */
89 unsigned long se_lastassoc; /* time of last association */
90 u_int se_scangen; /* iterator scan gen# */
91 u_int se_countrygen; /* gen# of last cc notify */
94 #define STA_HASHSIZE 32
95 /* simple hash is enough for variation of macaddr */
96 #define STA_HASH(addr) \
97 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE)
99 #define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */
100 CTASSERT(MAX_IEEE_CHAN >= 256);
103 ieee80211_scan_table_lock_t st_lock; /* on scan table */
104 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */
105 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE];
106 ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */
107 u_int st_scaniter; /* gen# for iterator */
108 u_int st_scangen; /* scan generation # */
110 /* ap-related state */
111 int st_maxrssi[MAX_IEEE_CHAN];
114 static void sta_flush_table(struct sta_table *);
116 * match_bss returns a bitmask describing if an entry is suitable
117 * for use. If non-zero the entry was deemed not suitable and it's
118 * contents explains why. The following flags are or'd to to this
119 * mask and can be used to figure out why the entry was rejected.
121 #define MATCH_CHANNEL 0x00001 /* channel mismatch */
122 #define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */
123 #define MATCH_PRIVACY 0x00004 /* privacy mismatch */
124 #define MATCH_RATE 0x00008 /* rate set mismatch */
125 #define MATCH_SSID 0x00010 /* ssid mismatch */
126 #define MATCH_BSSID 0x00020 /* bssid mismatch */
127 #define MATCH_FAILS 0x00040 /* too many failed auth attempts */
128 #define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */
129 #define MATCH_RSSI 0x00100 /* rssi deemed too low to use */
130 #define MATCH_CC 0x00200 /* country code mismatch */
131 #define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */
132 #define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */
133 #define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */
134 #define MATCH_TDMA_LOCAL 0x02000 /* local address */
135 #define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */
136 #define MATCH_MESH_NOID 0x10000 /* no MESHID ie */
137 #define MATCH_MESHID 0x20000 /* meshid mismatch */
138 static int match_bss(struct ieee80211vap *,
139 const struct ieee80211_scan_state *, struct sta_entry *, int);
140 static void adhoc_age(struct ieee80211_scan_state *);
143 isocmp(const uint8_t cc1[], const uint8_t cc2[])
145 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]);
148 /* number of references from net80211 layer */
149 static int nrefs = 0;
153 IEEE80211_SCANNER_MODULE(sta, 1);
156 * Attach prior to any scanning work.
159 sta_attach(struct ieee80211_scan_state *ss)
161 struct sta_table *st;
163 st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table),
165 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
168 IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable");
169 IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen");
170 TAILQ_INIT(&st->st_entry);
172 nrefs++; /* NB: we assume caller locking */
177 * Cleanup any private state.
180 sta_detach(struct ieee80211_scan_state *ss)
182 struct sta_table *st = ss->ss_priv;
186 IEEE80211_SCAN_TABLE_LOCK_DESTROY(st);
187 IEEE80211_SCAN_ITER_LOCK_DESTROY(st);
188 IEEE80211_FREE(st, M_80211_SCAN);
189 KASSERT(nrefs > 0, ("imbalanced attach/detach"));
190 nrefs--; /* NB: we assume caller locking */
196 * Flush all per-scan state.
199 sta_flush(struct ieee80211_scan_state *ss)
201 struct sta_table *st = ss->ss_priv;
203 IEEE80211_SCAN_TABLE_LOCK(st);
205 IEEE80211_SCAN_TABLE_UNLOCK(st);
211 * Flush all entries in the scan cache.
214 sta_flush_table(struct sta_table *st)
216 struct sta_entry *se, *next;
218 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
219 TAILQ_REMOVE(&st->st_entry, se, se_list);
220 LIST_REMOVE(se, se_hash);
221 ieee80211_ies_cleanup(&se->base.se_ies);
222 IEEE80211_FREE(se, M_80211_SCAN);
224 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi));
228 * Process a beacon or probe response frame; create an
229 * entry in the scan cache or update any previous entry.
232 sta_add(struct ieee80211_scan_state *ss,
233 struct ieee80211_channel *curchan,
234 const struct ieee80211_scanparams *sp,
235 const struct ieee80211_frame *wh,
236 int subtype, int rssi, int noise)
238 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
239 #define PICK1ST(_ss) \
240 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \
241 IEEE80211_SCAN_PICK1ST)
242 struct sta_table *st = ss->ss_priv;
243 const uint8_t *macaddr = wh->i_addr2;
244 struct ieee80211vap *vap = ss->ss_vap;
245 struct ieee80211com *ic = vap->iv_ic;
246 struct ieee80211_channel *c;
247 struct sta_entry *se;
248 struct ieee80211_scan_entry *ise;
251 hash = STA_HASH(macaddr);
253 IEEE80211_SCAN_TABLE_LOCK(st);
254 LIST_FOREACH(se, &st->st_hash[hash], se_hash)
255 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr))
257 se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry),
258 M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
260 IEEE80211_SCAN_TABLE_UNLOCK(st);
263 se->se_scangen = st->st_scaniter-1;
264 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
265 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr);
266 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list);
267 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash);
270 /* XXX ap beaconing multiple ssid w/ same bssid */
271 if (sp->ssid[1] != 0 &&
272 (ISPROBE(subtype) || ise->se_ssid[1] == 0))
273 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]);
274 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE,
275 ("rate set too large: %u", sp->rates[1]));
276 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]);
277 if (sp->xrates != NULL) {
278 /* XXX validate xrates[1] */
279 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE,
280 ("xrate set too large: %u", sp->xrates[1]));
281 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]);
283 ise->se_xrates[1] = 0;
284 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3);
285 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) {
287 * Record rssi data using extended precision LPF filter.
289 * NB: use only on-channel data to insure we get a good
290 * estimate of the signal we'll see when associated.
292 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi);
293 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi);
294 ise->se_noise = noise;
296 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp));
297 ise->se_intval = sp->bintval;
298 ise->se_capinfo = sp->capinfo;
299 #ifdef IEEE80211_SUPPORT_MESH
300 if (sp->meshid != NULL && sp->meshid[1] != 0)
301 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]);
304 * Beware of overriding se_chan for frames seen
305 * off-channel; this can cause us to attempt an
306 * association on the wrong channel.
308 if (sp->status & IEEE80211_BPARSE_OFFCHAN) {
310 * Off-channel, locate the home/bss channel for the sta
311 * using the value broadcast in the DSPARMS ie. We know
312 * sp->chan has this value because it's used to calculate
313 * IEEE80211_BPARSE_OFFCHAN.
315 c = ieee80211_find_channel_byieee(ic, sp->chan,
319 } else if (ise->se_chan == NULL) {
320 /* should not happen, pick something */
321 ise->se_chan = curchan;
324 ise->se_chan = curchan;
325 if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) {
326 /* Demote legacy networks to a non-HT channel. */
327 c = ieee80211_find_channel(ic, ise->se_chan->ic_freq,
328 ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT);
330 ("no legacy channel %u", ise->se_chan->ic_ieee));
333 ise->se_fhdwell = sp->fhdwell;
334 ise->se_fhindex = sp->fhindex;
335 ise->se_erp = sp->erp;
336 ise->se_timoff = sp->timoff;
337 if (sp->tim != NULL) {
338 const struct ieee80211_tim_ie *tim =
339 (const struct ieee80211_tim_ie *) sp->tim;
340 ise->se_dtimperiod = tim->tim_period;
342 if (sp->country != NULL) {
343 const struct ieee80211_country_ie *cie =
344 (const struct ieee80211_country_ie *) sp->country;
346 * If 11d is enabled and we're attempting to join a bss
347 * that advertises it's country code then compare our
348 * current settings to what we fetched from the country ie.
349 * If our country code is unspecified or different then
350 * dispatch an event to user space that identifies the
351 * country code so our regdomain config can be changed.
353 /* XXX only for STA mode? */
354 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) ||
355 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) &&
356 (ic->ic_regdomain.country == CTRY_DEFAULT ||
357 !isocmp(cie->cc, ic->ic_regdomain.isocc))) {
358 /* only issue one notify event per scan */
359 if (se->se_countrygen != st->st_scangen) {
360 ieee80211_notify_country(vap, ise->se_bssid,
362 se->se_countrygen = st->st_scangen;
365 ise->se_cc[0] = cie->cc[0];
366 ise->se_cc[1] = cie->cc[1];
368 /* NB: no need to setup ie ptrs; they are not (currently) used */
369 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len);
371 /* clear failure count after STA_FAIL_AGE passes */
372 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) {
374 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr,
375 "%s: fails %u", __func__, se->se_fails);
378 se->se_lastupdate = ticks; /* update time */
382 KASSERT(sizeof(sp->bchan) == 1, ("bchan size"));
383 if (rssi > st->st_maxrssi[sp->bchan])
384 st->st_maxrssi[sp->bchan] = rssi;
386 IEEE80211_SCAN_TABLE_UNLOCK(st);
389 * If looking for a quick choice and nothing's
390 * been found check here.
392 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0)
393 ss->ss_flags |= IEEE80211_SCAN_GOTPICK;
401 * Check if a channel is excluded by user request.
404 isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c)
406 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) ||
407 (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
408 c->ic_freq != vap->iv_des_chan->ic_freq));
411 static struct ieee80211_channel *
412 find11gchannel(struct ieee80211com *ic, int i, int freq)
414 struct ieee80211_channel *c;
418 * The normal ordering in the channel list is b channel
419 * immediately followed by g so optimize the search for
420 * this. We'll still do a full search just in case.
422 for (j = i+1; j < ic->ic_nchans; j++) {
423 c = &ic->ic_channels[j];
424 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c))
427 for (j = 0; j < i; j++) {
428 c = &ic->ic_channels[j];
429 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c))
435 static const u_int chanflags[IEEE80211_MODE_MAX] = {
436 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B,
437 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A,
438 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B,
439 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G,
440 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS,
441 /* check base channel */
442 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A,
443 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G,
444 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST,
445 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF,
446 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER,
448 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A,
449 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G,
453 add_channels(struct ieee80211vap *vap,
454 struct ieee80211_scan_state *ss,
455 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq)
457 struct ieee80211com *ic = vap->iv_ic;
458 struct ieee80211_channel *c, *cg;
462 KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode));
463 modeflags = chanflags[mode];
464 for (i = 0; i < nfreq; i++) {
465 if (ss->ss_last >= IEEE80211_SCAN_MAX)
468 c = ieee80211_find_channel(ic, freq[i], modeflags);
469 if (c == NULL || isexcluded(vap, c))
471 if (mode == IEEE80211_MODE_AUTO) {
473 * XXX special-case 11b/g channels so we select
474 * the g channel if both are present.
476 if (IEEE80211_IS_CHAN_B(c) &&
477 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL)
480 ss->ss_chans[ss->ss_last++] = c;
487 const uint16_t *list;
491 checktable(const struct scanlist *scan, const struct ieee80211_channel *c)
495 for (; scan->list != NULL; scan++) {
496 for (i = 0; i < scan->count; i++)
497 if (scan->list[i] == c->ic_freq)
504 onscanlist(const struct ieee80211_scan_state *ss,
505 const struct ieee80211_channel *c)
509 for (i = 0; i < ss->ss_last; i++)
510 if (ss->ss_chans[i] == c)
516 sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
517 const struct scanlist table[])
519 struct ieee80211com *ic = vap->iv_ic;
520 struct ieee80211_channel *c;
523 for (i = 0; i < ic->ic_nchans; i++) {
524 if (ss->ss_last >= IEEE80211_SCAN_MAX)
527 c = &ic->ic_channels[i];
529 * Ignore dynamic turbo channels; we scan them
530 * in normal mode (i.e. not boosted). Likewise
531 * for HT channels, they get scanned using
534 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c))
538 * If a desired mode was specified, scan only
539 * channels that satisfy that constraint.
541 if (vap->iv_des_mode != IEEE80211_MODE_AUTO &&
542 vap->iv_des_mode != ieee80211_chan2mode(c))
546 * Skip channels excluded by user request.
548 if (isexcluded(vap, c))
552 * Add the channel unless it is listed in the
553 * fixed scan order tables. This insures we
554 * don't sweep back in channels we filtered out
557 if (checktable(table, c))
560 /* Add channel to scanning list. */
561 ss->ss_chans[ss->ss_last++] = c;
564 * Explicitly add any desired channel if:
565 * - not already on the scan list
566 * - allowed by any desired mode constraint
567 * - there is space in the scan list
568 * This allows the channel to be used when the filtering
569 * mechanisms would otherwise elide it (e.g HT, turbo).
571 c = vap->iv_des_chan;
572 if (c != IEEE80211_CHAN_ANYC &&
573 !onscanlist(ss, c) &&
574 (vap->iv_des_mode == IEEE80211_MODE_AUTO ||
575 vap->iv_des_mode == ieee80211_chan2mode(c)) &&
576 ss->ss_last < IEEE80211_SCAN_MAX)
577 ss->ss_chans[ss->ss_last++] = c;
581 makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap,
582 const struct scanlist table[])
584 const struct scanlist *scan;
585 enum ieee80211_phymode mode;
589 * Use the table of ordered channels to construct the list
590 * of channels for scanning. Any channels in the ordered
591 * list not in the master list will be discarded.
593 for (scan = table; scan->list != NULL; scan++) {
595 if (vap->iv_des_mode != IEEE80211_MODE_AUTO) {
597 * If a desired mode was specified, scan only
598 * channels that satisfy that constraint.
600 if (vap->iv_des_mode != mode) {
602 * The scan table marks 2.4Ghz channels as b
603 * so if the desired mode is 11g, then use
604 * the 11b channel list but upgrade the mode.
606 if (vap->iv_des_mode == IEEE80211_MODE_11G) {
607 if (mode == IEEE80211_MODE_11G) /* Skip the G check */
609 else if (mode == IEEE80211_MODE_11B)
610 mode = IEEE80211_MODE_11G; /* upgrade */
615 * This lets add_channels upgrade an 11b channel
616 * to 11g if available.
618 if (mode == IEEE80211_MODE_11B)
619 mode = IEEE80211_MODE_AUTO;
621 #ifdef IEEE80211_F_XR
622 /* XR does not operate on turbo channels */
623 if ((vap->iv_flags & IEEE80211_F_XR) &&
624 (mode == IEEE80211_MODE_TURBO_A ||
625 mode == IEEE80211_MODE_TURBO_G ||
626 mode == IEEE80211_MODE_STURBO_A))
630 * Add the list of the channels; any that are not
631 * in the master channel list will be discarded.
633 add_channels(vap, ss, mode, scan->list, scan->count);
637 * Add the channels from the ic that are not present
640 sweepchannels(ss, vap, table);
643 static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */
644 { 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 };
645 static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */
646 { 5170, 5190, 5210, 5230 };
647 static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */
648 { 2412, 2437, 2462, 2442, 2472 };
649 static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */
650 { 5745, 5765, 5785, 5805, 5825 };
651 static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */
652 { 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 };
653 static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */
654 { 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 };
655 static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */
657 static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */
658 { 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 };
659 static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */
660 { 5040, 5060, 5080, 4920, 4940, 4960, 4980 };
661 #ifdef ATH_TURBO_SCAN
662 static const uint16_t rcl5[] = /* 3 static turbo channels */
663 { 5210, 5250, 5290 };
664 static const uint16_t rcl6[] = /* 2 static turbo channels */
666 static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */
667 { 5540, 5580, 5620, 5660 };
668 static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */
670 static const uint16_t rcl13[] = /* dynamic Turbo channels */
671 { 5200, 5240, 5280, 5765, 5805 };
672 #endif /* ATH_TURBO_SCAN */
674 #define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a
676 static const struct scanlist staScanTable[] = {
677 { IEEE80211_MODE_11B, X(rcl3) },
678 { IEEE80211_MODE_11A, X(rcl1) },
679 { IEEE80211_MODE_11A, X(rcl2) },
680 { IEEE80211_MODE_11B, X(rcl8) },
681 { IEEE80211_MODE_11B, X(rcl9) },
682 { IEEE80211_MODE_11A, X(rcl4) },
683 #ifdef ATH_TURBO_SCAN
684 { IEEE80211_MODE_STURBO_A, X(rcl5) },
685 { IEEE80211_MODE_STURBO_A, X(rcl6) },
686 { IEEE80211_MODE_TURBO_A, X(rcl6x) },
687 { IEEE80211_MODE_TURBO_A, X(rcl13) },
688 #endif /* ATH_TURBO_SCAN */
689 { IEEE80211_MODE_11A, X(rcl7) },
690 { IEEE80211_MODE_11B, X(rcl10) },
691 { IEEE80211_MODE_11A, X(rcl11) },
692 #ifdef ATH_TURBO_SCAN
693 { IEEE80211_MODE_TURBO_G, X(rcl12) },
694 #endif /* ATH_TURBO_SCAN */
699 * Start a station-mode scan by populating the channel list.
702 sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
704 struct sta_table *st = ss->ss_priv;
706 makescanlist(ss, vap, staScanTable);
708 if (ss->ss_mindwell == 0)
709 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */
710 if (ss->ss_maxdwell == 0)
711 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
720 * Restart a scan, typically a bg scan but can
721 * also be a fg scan that came up empty.
724 sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
726 struct sta_table *st = ss->ss_priv;
733 * Cancel an ongoing scan.
736 sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
742 * Demote any supplied 11g channel to 11b. There should
743 * always be an 11b channel but we check anyway...
745 static struct ieee80211_channel *
746 demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan)
748 struct ieee80211_channel *c;
750 if (IEEE80211_IS_CHAN_ANYG(chan) &&
751 vap->iv_des_mode == IEEE80211_MODE_AUTO) {
752 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq,
753 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) |
762 maxrate(const struct ieee80211_scan_entry *se)
764 const struct ieee80211_ie_htcap *htcap =
765 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie;
766 int rmax, r, i, txstream;
773 * HT station; inspect supported MCS and then adjust
774 * rate by channel width.
776 txparams = htcap->hc_mcsset[12];
777 if (txparams & 0x3) {
779 * TX MCS parameters defined and not equal to RX,
780 * extract the number of spartial streams and
781 * map it to the highest MCS rate.
783 txstream = ((txparams & 0xc) >> 2) + 1;
784 i = txstream * 8 - 1;
786 for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--);
788 caps = LE_READ_2(&htcap->hc_cap);
789 if ((caps & IEEE80211_HTCAP_CHWIDTH40) &&
790 (caps & IEEE80211_HTCAP_SHORTGI40))
791 rmax = ieee80211_htrates[i].ht40_rate_400ns;
792 else if (caps & IEEE80211_HTCAP_CHWIDTH40)
793 rmax = ieee80211_htrates[i].ht40_rate_800ns;
794 else if (caps & IEEE80211_HTCAP_SHORTGI20)
795 rmax = ieee80211_htrates[i].ht20_rate_400ns;
797 rmax = ieee80211_htrates[i].ht20_rate_800ns;
800 for (i = 0; i < se->se_rates[1]; i++) {
801 r = se->se_rates[2+i] & IEEE80211_RATE_VAL;
805 for (i = 0; i < se->se_xrates[1]; i++) {
806 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL;
814 * Compare the capabilities of two entries and decide which is
815 * more desirable (return >0 if a is considered better). Note
816 * that we assume compatibility/usability has already been checked
817 * so we don't need to (e.g. validate whether privacy is supported).
818 * Used to select the best scan candidate for association in a BSS.
821 sta_compare(const struct sta_entry *a, const struct sta_entry *b)
823 #define PREFER(_a,_b,_what) do { \
824 if (((_a) ^ (_b)) & (_what)) \
825 return ((_a) & (_what)) ? 1 : -1; \
831 /* privacy support */
832 PREFER(a->base.se_capinfo, b->base.se_capinfo,
833 IEEE80211_CAPINFO_PRIVACY);
835 /* compare count of previous failures */
836 weight = b->se_fails - a->se_fails;
841 * Compare rssi. If the two are considered equivalent
842 * then fallback to other criteria. We threshold the
843 * comparisons to avoid selecting an ap purely by rssi
844 * when both values may be good but one ap is otherwise
845 * more desirable (e.g. an 11b-only ap with stronger
846 * signal than an 11g ap).
848 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX);
849 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX);
850 if (abs(rssib - rssia) < 5) {
851 /* best/max rate preferred if signal level close enough XXX */
852 maxa = maxrate(&a->base);
853 maxb = maxrate(&b->base);
856 /* XXX use freq for channel preference */
857 /* for now just prefer 5Ghz band to all other bands */
858 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan),
859 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1);
861 /* all things being equal, use signal level */
862 return a->base.se_rssi - b->base.se_rssi;
867 * Check rate set suitability and return the best supported rate.
868 * XXX inspect MCS for HT
871 check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan,
872 const struct ieee80211_scan_entry *se)
874 const struct ieee80211_rateset *srs;
875 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate;
878 okrate = badrate = 0;
880 srs = ieee80211_get_suprates(vap->iv_ic, chan);
881 nrs = se->se_rates[1];
884 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate;
885 fixedrate = IEEE80211_FIXED_RATE_NONE;
887 for (i = 0; i < nrs; i++) {
888 r = IEEE80211_RV(rs[i]);
891 * Check any fixed rate is included.
896 * Check against our supported rates.
898 for (j = 0; j < srs->rs_nrates; j++)
899 if (r == IEEE80211_RV(srs->rs_rates[j])) {
900 if (r > okrate) /* NB: track max */
905 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) {
907 * Don't try joining a BSS, if we don't support
908 * one of its basic rates.
914 if (rs == se->se_rates+2) {
915 /* scan xrates too; sort of an algol68-style for loop */
916 nrs = se->se_xrates[1];
917 rs = se->se_xrates+2;
922 if (okrate == 0 || ucastrate != fixedrate)
923 return badrate | IEEE80211_RATE_BASIC;
925 return IEEE80211_RV(okrate);
929 match_id(const uint8_t *ie, const uint8_t *val, int len)
931 return (ie[1] == len && memcmp(ie+2, val, len) == 0);
935 match_ssid(const uint8_t *ie,
936 int nssid, const struct ieee80211_scan_ssid ssids[])
940 for (i = 0; i < nssid; i++) {
941 if (match_id(ie, ssids[i].ssid, ssids[i].len))
947 #ifdef IEEE80211_SUPPORT_TDMA
949 tdma_isfull(const struct ieee80211_tdma_param *tdma)
953 slotcnt = tdma->tdma_slotcnt;
954 for (slot = slotcnt-1; slot >= 0; slot--)
955 if (isclr(tdma->tdma_inuse, slot))
959 #endif /* IEEE80211_SUPPORT_TDMA */
962 * Test a scan candidate for suitability/compatibility.
965 match_bss(struct ieee80211vap *vap,
966 const struct ieee80211_scan_state *ss, struct sta_entry *se0,
969 struct ieee80211com *ic = vap->iv_ic;
970 struct ieee80211_scan_entry *se = &se0->base;
975 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan)))
976 fail |= MATCH_CHANNEL;
978 * NB: normally the desired mode is used to construct
979 * the channel list, but it's possible for the scan
980 * cache to include entries for stations outside this
981 * list so we check the desired mode here to weed them
984 if (vap->iv_des_mode != IEEE80211_MODE_AUTO &&
985 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
986 chanflags[vap->iv_des_mode])
987 fail |= MATCH_CHANNEL;
988 if (vap->iv_opmode == IEEE80211_M_IBSS) {
989 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
990 fail |= MATCH_CAPINFO;
991 #ifdef IEEE80211_SUPPORT_TDMA
992 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
994 * Adhoc demo network setup shouldn't really be scanning
995 * but just in case skip stations operating in IBSS or
998 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS))
999 fail |= MATCH_CAPINFO;
1001 * TDMA operation cannot coexist with a normal 802.11 network;
1002 * skip if IBSS or ESS capabilities are marked and require
1003 * the beacon have a TDMA ie present.
1005 if (vap->iv_caps & IEEE80211_C_TDMA) {
1006 const struct ieee80211_tdma_param *tdma =
1007 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie;
1008 const struct ieee80211_tdma_state *ts = vap->iv_tdma;
1011 fail |= MATCH_TDMA_NOIE;
1012 else if (tdma->tdma_version != ts->tdma_version)
1013 fail |= MATCH_TDMA_VERSION;
1014 else if (tdma->tdma_slot != 0)
1015 fail |= MATCH_TDMA_NOTMASTER;
1016 else if (tdma_isfull(tdma))
1017 fail |= MATCH_TDMA_NOSLOT;
1019 else if (ieee80211_local_address(se->se_macaddr))
1020 fail |= MATCH_TDMA_LOCAL;
1023 #endif /* IEEE80211_SUPPORT_TDMA */
1024 #ifdef IEEE80211_SUPPORT_MESH
1025 } else if (vap->iv_opmode == IEEE80211_M_MBSS) {
1026 const struct ieee80211_mesh_state *ms = vap->iv_mesh;
1028 * Mesh nodes have IBSS & ESS bits in capinfo turned off
1029 * and two special ie's that must be present.
1031 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS))
1032 fail |= MATCH_CAPINFO;
1033 else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID)
1034 fail |= MATCH_MESH_NOID;
1035 else if (ms->ms_idlen != 0 &&
1036 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen))
1037 fail |= MATCH_MESHID;
1040 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0)
1041 fail |= MATCH_CAPINFO;
1043 * If 11d is enabled and we're attempting to join a bss
1044 * that advertises it's country code then compare our
1045 * current settings to what we fetched from the country ie.
1046 * If our country code is unspecified or different then do
1047 * not attempt to join the bss. We should have already
1048 * dispatched an event to user space that identifies the
1049 * new country code so our regdomain config should match.
1051 if ((IEEE80211_IS_CHAN_11D(se->se_chan) ||
1052 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) &&
1053 se->se_cc[0] != 0 &&
1054 (ic->ic_regdomain.country == CTRY_DEFAULT ||
1055 !isocmp(se->se_cc, ic->ic_regdomain.isocc)))
1058 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1059 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
1060 fail |= MATCH_PRIVACY;
1062 /* XXX does this mean privacy is supported or required? */
1063 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY)
1064 fail |= MATCH_PRIVACY;
1066 se0->se_flags &= ~STA_DEMOTE11B;
1067 rate = check_rate(vap, se->se_chan, se);
1068 if (rate & IEEE80211_RATE_BASIC) {
1071 * An 11b-only ap will give a rate mismatch if there is an
1072 * OFDM fixed tx rate for 11g. Try downgrading the channel
1073 * in the scan list to 11b and retry the rate check.
1075 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) {
1076 rate = check_rate(vap, demote11b(vap, se->se_chan), se);
1077 if ((rate & IEEE80211_RATE_BASIC) == 0) {
1078 fail &= ~MATCH_RATE;
1079 se0->se_flags |= STA_DEMOTE11B;
1082 } else if (rate < 2*24) {
1084 * This is an 11b-only ap. Check the desired mode in
1085 * case that needs to be honored (mode 11g filters out
1086 * 11b-only ap's). Otherwise force any 11g channel used
1087 * in scanning to be demoted.
1089 * NB: we cheat a bit here by looking at the max rate;
1090 * we could/should check the rates.
1092 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO ||
1093 vap->iv_des_mode == IEEE80211_MODE_11B))
1096 se0->se_flags |= STA_DEMOTE11B;
1098 if (ss->ss_nssid != 0 &&
1099 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid))
1101 if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
1102 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid))
1103 fail |= MATCH_BSSID;
1104 if (se0->se_fails >= STA_FAILS_MAX)
1105 fail |= MATCH_FAILS;
1106 if (se0->se_notseen >= STA_PURGE_SCANS)
1107 fail |= MATCH_NOTSEEN;
1108 if (se->se_rssi < STA_RSSI_MIN)
1110 #ifdef IEEE80211_DEBUG
1111 if (ieee80211_msg(vap, debug)) {
1113 fail & MATCH_FAILS ? '=' :
1114 fail & MATCH_NOTSEEN ? '^' :
1115 fail & MATCH_CC ? '$' :
1116 #ifdef IEEE80211_SUPPORT_TDMA
1117 fail & MATCH_TDMA_NOIE ? '&' :
1118 fail & MATCH_TDMA_VERSION ? 'v' :
1119 fail & MATCH_TDMA_NOTMASTER ? 's' :
1120 fail & MATCH_TDMA_NOSLOT ? 'f' :
1121 fail & MATCH_TDMA_LOCAL ? 'l' :
1123 fail & MATCH_MESH_NOID ? 'm' :
1124 fail ? '-' : '+', ether_sprintf(se->se_macaddr));
1125 printf(" %s%c", ether_sprintf(se->se_bssid),
1126 fail & MATCH_BSSID ? '!' : ' ');
1127 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan),
1128 fail & MATCH_CHANNEL ? '!' : ' ');
1129 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' ');
1130 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
1131 fail & MATCH_RATE ? '!' : ' ');
1133 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
1134 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "",
1135 fail & MATCH_CAPINFO ? '!' : ' ');
1137 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
1139 fail & MATCH_PRIVACY ? '!' : ' ');
1140 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]);
1141 printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : "");
1148 sta_update_notseen(struct sta_table *st)
1150 struct sta_entry *se;
1152 IEEE80211_SCAN_TABLE_LOCK(st);
1153 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1155 * If seen the reset and don't bump the count;
1156 * otherwise bump the ``not seen'' count. Note
1157 * that this insures that stations for which we
1158 * see frames while not scanning but not during
1159 * this scan will not be penalized.
1166 IEEE80211_SCAN_TABLE_UNLOCK(st);
1170 sta_dec_fails(struct sta_table *st)
1172 struct sta_entry *se;
1174 IEEE80211_SCAN_TABLE_LOCK(st);
1175 TAILQ_FOREACH(se, &st->st_entry, se_list)
1178 IEEE80211_SCAN_TABLE_UNLOCK(st);
1181 static struct sta_entry *
1182 select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug)
1184 struct sta_table *st = ss->ss_priv;
1185 struct sta_entry *se, *selbs = NULL;
1187 IEEE80211_DPRINTF(vap, debug, " %s\n",
1188 "macaddr bssid chan rssi rate flag wep essid");
1189 IEEE80211_SCAN_TABLE_LOCK(st);
1190 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1191 ieee80211_ies_expand(&se->base.se_ies);
1192 if (match_bss(vap, ss, se, debug) == 0) {
1195 else if (sta_compare(se, selbs) > 0)
1199 IEEE80211_SCAN_TABLE_UNLOCK(st);
1205 * Pick an ap or ibss network to join or find a channel
1206 * to use to start an ibss network.
1209 sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1211 struct sta_table *st = ss->ss_priv;
1212 struct sta_entry *selbs;
1213 struct ieee80211_channel *chan;
1215 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1216 ("wrong mode %u", vap->iv_opmode));
1218 if (st->st_newscan) {
1219 sta_update_notseen(st);
1222 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1224 * Manual/background scan, don't select+join the
1225 * bss, just return. The scanning framework will
1226 * handle notification that this has completed.
1228 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1232 * Automatic sequencing; look for a candidate and
1233 * if found join the network.
1235 /* NB: unlocked read should be ok */
1236 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1238 "%s: no scan candidate\n", __func__);
1239 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1243 * If nothing suitable was found decrement
1244 * the failure counts so entries will be
1245 * reconsidered the next time around. We
1246 * really want to do this only for sta's
1247 * where we've previously had some success.
1251 return 0; /* restart scan */
1253 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1254 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1255 return (selbs != NULL);
1258 chan = selbs->base.se_chan;
1259 if (selbs->se_flags & STA_DEMOTE11B)
1260 chan = demote11b(vap, chan);
1261 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1263 return 1; /* terminate scan */
1267 * Lookup an entry in the scan cache. We assume we're
1268 * called from the bottom half or such that we don't need
1269 * to block the bottom half so that it's safe to return
1270 * a reference to an entry w/o holding the lock on the table.
1272 static struct sta_entry *
1273 sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN])
1275 struct sta_entry *se;
1276 int hash = STA_HASH(macaddr);
1278 IEEE80211_SCAN_TABLE_LOCK(st);
1279 LIST_FOREACH(se, &st->st_hash[hash], se_hash)
1280 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr))
1282 IEEE80211_SCAN_TABLE_UNLOCK(st);
1284 return se; /* NB: unlocked */
1288 sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1290 struct ieee80211com *ic = vap->iv_ic;
1291 struct ieee80211_node *ni = vap->iv_bss;
1292 struct sta_table *st = ss->ss_priv;
1293 enum ieee80211_phymode mode;
1294 struct sta_entry *se, *selbs;
1295 uint8_t roamRate, curRate, ucastRate;
1296 int8_t roamRssi, curRssi;
1298 se = sta_lookup(st, ni->ni_macaddr);
1300 /* XXX something is wrong */
1304 mode = ieee80211_chan2mode(ic->ic_bsschan);
1305 roamRate = vap->iv_roamparms[mode].rate;
1306 roamRssi = vap->iv_roamparms[mode].rssi;
1307 ucastRate = vap->iv_txparms[mode].ucastrate;
1308 /* NB: the most up to date rssi is in the node, not the scan cache */
1309 curRssi = ic->ic_node_getrssi(ni);
1310 if (ucastRate == IEEE80211_FIXED_RATE_NONE) {
1311 curRate = ni->ni_txrate;
1312 roamRate &= IEEE80211_RATE_VAL;
1313 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
1314 "%s: currssi %d currate %u roamrssi %d roamrate %u\n",
1315 __func__, curRssi, curRate, roamRssi, roamRate);
1317 curRate = roamRate; /* NB: insure compare below fails */
1318 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM,
1319 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi);
1322 * Check if a new ap should be used and switch.
1323 * XXX deauth current ap
1325 if (curRate < roamRate || curRssi < roamRssi) {
1326 if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) {
1328 * Scan cache contents are too old; force a scan now
1329 * if possible so we have current state to make a
1330 * decision with. We don't kick off a bg scan if
1331 * we're using dynamic turbo and boosted or if the
1333 * XXX force immediate switch on scan complete
1335 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1336 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))
1337 ieee80211_bg_scan(vap, 0);
1340 se->base.se_rssi = curRssi;
1341 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM);
1342 if (selbs != NULL && selbs != se) {
1343 struct ieee80211_channel *chan;
1345 IEEE80211_DPRINTF(vap,
1346 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG,
1347 "%s: ROAM: curRate %u, roamRate %u, "
1348 "curRssi %d, roamRssi %d\n", __func__,
1349 curRate, roamRate, curRssi, roamRssi);
1351 chan = selbs->base.se_chan;
1352 if (selbs->se_flags & STA_DEMOTE11B)
1353 chan = demote11b(vap, chan);
1354 (void) ieee80211_sta_join(vap, chan, &selbs->base);
1360 * Age entries in the scan cache.
1361 * XXX also do roaming since it's convenient
1364 sta_age(struct ieee80211_scan_state *ss)
1366 struct ieee80211vap *vap = ss->ss_vap;
1370 * If rate control is enabled check periodically to see if
1371 * we should roam from our current connection to one that
1372 * might be better. This only applies when we're operating
1373 * in sta mode and automatic roaming is set.
1375 * XXX repeater station
1376 * XXX do when !bgscan?
1378 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1379 ("wrong mode %u", vap->iv_opmode));
1380 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO &&
1381 (vap->iv_flags & IEEE80211_F_BGSCAN) &&
1382 vap->iv_state >= IEEE80211_S_RUN)
1383 /* XXX vap is implicit */
1384 sta_roam_check(ss, vap);
1388 * Iterate over the entries in the scan cache, invoking
1389 * the callback function on each one.
1392 sta_iterate(struct ieee80211_scan_state *ss,
1393 ieee80211_scan_iter_func *f, void *arg)
1395 struct sta_table *st = ss->ss_priv;
1396 struct sta_entry *se;
1399 IEEE80211_SCAN_ITER_LOCK(st);
1400 gen = st->st_scaniter++;
1402 IEEE80211_SCAN_TABLE_LOCK(st);
1403 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1404 if (se->se_scangen != gen) {
1405 se->se_scangen = gen;
1406 /* update public state */
1407 se->base.se_age = ticks - se->se_lastupdate;
1408 IEEE80211_SCAN_TABLE_UNLOCK(st);
1409 (*f)(arg, &se->base);
1413 IEEE80211_SCAN_TABLE_UNLOCK(st);
1415 IEEE80211_SCAN_ITER_UNLOCK(st);
1419 sta_assoc_fail(struct ieee80211_scan_state *ss,
1420 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason)
1422 struct sta_table *st = ss->ss_priv;
1423 struct sta_entry *se;
1425 se = sta_lookup(st, macaddr);
1428 se->se_lastfail = ticks;
1429 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
1430 macaddr, "%s: reason %u fails %u",
1431 __func__, reason, se->se_fails);
1436 sta_assoc_success(struct ieee80211_scan_state *ss,
1437 const uint8_t macaddr[IEEE80211_ADDR_LEN])
1439 struct sta_table *st = ss->ss_priv;
1440 struct sta_entry *se;
1442 se = sta_lookup(st, macaddr);
1446 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN,
1447 macaddr, "%s: fails %u",
1448 __func__, se->se_fails);
1450 se->se_lastassoc = ticks;
1454 static const struct ieee80211_scanner sta_default = {
1455 .scan_name = "default",
1456 .scan_attach = sta_attach,
1457 .scan_detach = sta_detach,
1458 .scan_start = sta_start,
1459 .scan_restart = sta_restart,
1460 .scan_cancel = sta_cancel,
1461 .scan_end = sta_pick_bss,
1462 .scan_flush = sta_flush,
1463 .scan_add = sta_add,
1464 .scan_age = sta_age,
1465 .scan_iterate = sta_iterate,
1466 .scan_assoc_fail = sta_assoc_fail,
1467 .scan_assoc_success = sta_assoc_success,
1469 IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default);
1472 * Adhoc mode-specific support.
1475 static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */
1476 { 5180, 5200, 5220, 5240 };
1477 static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */
1478 { 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 };
1479 static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */
1480 { 5170, 5190, 5210, 5230 };
1481 static const uint16_t adhoc11b[] = /* 10, 11 */
1484 static const struct scanlist adhocScanTable[] = {
1485 { IEEE80211_MODE_11B, X(adhoc11b) },
1486 { IEEE80211_MODE_11A, X(adhocWorld) },
1487 { IEEE80211_MODE_11A, X(adhocFcc3) },
1488 { IEEE80211_MODE_11B, X(adhocMkk) },
1494 * Start an adhoc-mode scan by populating the channel list.
1497 adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1499 struct sta_table *st = ss->ss_priv;
1501 makescanlist(ss, vap, adhocScanTable);
1503 if (ss->ss_mindwell == 0)
1504 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */
1505 if (ss->ss_maxdwell == 0)
1506 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
1515 * Select a channel to start an adhoc network on.
1516 * The channel list was populated with appropriate
1517 * channels so select one that looks least occupied.
1519 static struct ieee80211_channel *
1520 adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags)
1522 struct sta_table *st = ss->ss_priv;
1523 struct sta_entry *se;
1524 struct ieee80211_channel *c, *bestchan;
1525 int i, bestrssi, maxrssi;
1530 IEEE80211_SCAN_TABLE_LOCK(st);
1531 for (i = 0; i < ss->ss_last; i++) {
1532 c = ss->ss_chans[i];
1533 /* never consider a channel with radar */
1534 if (IEEE80211_IS_CHAN_RADAR(c))
1536 /* skip channels disallowed by regulatory settings */
1537 if (IEEE80211_IS_CHAN_NOADHOC(c))
1539 /* check channel attributes for band compatibility */
1540 if (flags != 0 && (c->ic_flags & flags) != flags)
1543 TAILQ_FOREACH(se, &st->st_entry, se_list) {
1544 if (se->base.se_chan != c)
1546 if (se->base.se_rssi > maxrssi)
1547 maxrssi = se->base.se_rssi;
1549 if (bestchan == NULL || maxrssi < bestrssi)
1552 IEEE80211_SCAN_TABLE_UNLOCK(st);
1558 * Pick an ibss network to join or find a channel
1559 * to use to start an ibss network.
1562 adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1564 struct sta_table *st = ss->ss_priv;
1565 struct sta_entry *selbs;
1566 struct ieee80211_channel *chan;
1567 struct ieee80211com *ic = vap->iv_ic;
1569 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS ||
1570 vap->iv_opmode == IEEE80211_M_AHDEMO ||
1571 vap->iv_opmode == IEEE80211_M_MBSS,
1572 ("wrong opmode %u", vap->iv_opmode));
1574 if (st->st_newscan) {
1575 sta_update_notseen(st);
1578 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1580 * Manual/background scan, don't select+join the
1581 * bss, just return. The scanning framework will
1582 * handle notification that this has completed.
1584 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1588 * Automatic sequencing; look for a candidate and
1589 * if found join the network.
1591 /* NB: unlocked read should be ok */
1592 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1593 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1594 "%s: no scan candidate\n", __func__);
1595 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1598 /* NB: never auto-start a tdma network for slot !0 */
1599 #ifdef IEEE80211_SUPPORT_TDMA
1600 if (vap->iv_des_nssid &&
1601 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 ||
1602 ieee80211_tdma_getslot(vap) == 0)) {
1604 if (vap->iv_des_nssid) {
1607 * No existing adhoc network to join and we have
1608 * an ssid; start one up. If no channel was
1609 * specified, try to select a channel.
1611 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC ||
1612 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
1613 chan = adhoc_pick_channel(ss, 0);
1615 chan = vap->iv_des_chan;
1617 struct ieee80211com *ic = vap->iv_ic;
1619 * Create a HT capable IBSS; the per-node
1620 * probe request/response will result in
1621 * "correct" rate control capabilities being
1624 chan = ieee80211_ht_adjust_channel(ic,
1625 chan, vap->iv_flags_ht);
1626 ieee80211_create_ibss(vap, chan);
1631 * If nothing suitable was found decrement
1632 * the failure counts so entries will be
1633 * reconsidered the next time around. We
1634 * really want to do this only for sta's
1635 * where we've previously had some success.
1639 return 0; /* restart scan */
1641 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1642 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1643 return (selbs != NULL);
1646 chan = selbs->base.se_chan;
1647 if (selbs->se_flags & STA_DEMOTE11B)
1648 chan = demote11b(vap, chan);
1650 * If HT is available, make it a possibility here.
1651 * The intent is to enable HT20/HT40 when joining a non-HT
1652 * IBSS node; we can then advertise HT IEs and speak HT
1653 * to any subsequent nodes that support it.
1655 chan = ieee80211_ht_adjust_channel(ic,
1656 chan, vap->iv_flags_ht);
1657 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1659 return 1; /* terminate scan */
1663 * Age entries in the scan cache.
1666 adhoc_age(struct ieee80211_scan_state *ss)
1668 struct sta_table *st = ss->ss_priv;
1669 struct sta_entry *se, *next;
1671 IEEE80211_SCAN_TABLE_LOCK(st);
1672 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) {
1673 if (se->se_notseen > STA_PURGE_SCANS) {
1674 TAILQ_REMOVE(&st->st_entry, se, se_list);
1675 LIST_REMOVE(se, se_hash);
1676 ieee80211_ies_cleanup(&se->base.se_ies);
1677 IEEE80211_FREE(se, M_80211_SCAN);
1680 IEEE80211_SCAN_TABLE_UNLOCK(st);
1683 static const struct ieee80211_scanner adhoc_default = {
1684 .scan_name = "default",
1685 .scan_attach = sta_attach,
1686 .scan_detach = sta_detach,
1687 .scan_start = adhoc_start,
1688 .scan_restart = sta_restart,
1689 .scan_cancel = sta_cancel,
1690 .scan_end = adhoc_pick_bss,
1691 .scan_flush = sta_flush,
1692 .scan_pickchan = adhoc_pick_channel,
1693 .scan_add = sta_add,
1694 .scan_age = adhoc_age,
1695 .scan_iterate = sta_iterate,
1696 .scan_assoc_fail = sta_assoc_fail,
1697 .scan_assoc_success = sta_assoc_success,
1699 IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default);
1700 IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default);
1703 ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1705 struct sta_table *st = ss->ss_priv;
1707 makescanlist(ss, vap, staScanTable);
1709 if (ss->ss_mindwell == 0)
1710 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */
1711 if (ss->ss_maxdwell == 0)
1712 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */
1721 * Cancel an ongoing scan.
1724 ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1730 * Pick a quiet channel to use for ap operation.
1732 static struct ieee80211_channel *
1733 ap_pick_channel(struct ieee80211_scan_state *ss, int flags)
1735 struct sta_table *st = ss->ss_priv;
1736 struct ieee80211_channel *bestchan = NULL;
1739 /* XXX select channel more intelligently, e.g. channel spread, power */
1740 /* NB: use scan list order to preserve channel preference */
1741 for (i = 0; i < ss->ss_last; i++) {
1742 struct ieee80211_channel *chan = ss->ss_chans[i];
1744 * If the channel is unoccupied the max rssi
1745 * should be zero; just take it. Otherwise
1746 * track the channel with the lowest rssi and
1747 * use that when all channels appear occupied.
1749 if (IEEE80211_IS_CHAN_RADAR(chan))
1751 if (IEEE80211_IS_CHAN_NOHOSTAP(chan))
1753 /* check channel attributes for band compatibility */
1754 if (flags != 0 && (chan->ic_flags & flags) != flags)
1756 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size"));
1757 /* XXX channel have interference */
1758 if (st->st_maxrssi[chan->ic_ieee] == 0) {
1759 /* XXX use other considerations */
1762 if (bestchan == NULL ||
1763 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee])
1770 * Pick a quiet channel to use for ap operation.
1773 ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1775 struct ieee80211com *ic = vap->iv_ic;
1776 struct ieee80211_channel *bestchan;
1778 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
1779 ("wrong opmode %u", vap->iv_opmode));
1780 bestchan = ap_pick_channel(ss, 0);
1781 if (bestchan == NULL) {
1782 /* no suitable channel, should not happen */
1783 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1784 "%s: no suitable channel! (should not happen)\n", __func__);
1785 /* XXX print something? */
1786 return 0; /* restart scan */
1789 * If this is a dynamic turbo channel, start with the unboosted one.
1791 if (IEEE80211_IS_CHAN_TURBO(bestchan)) {
1792 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq,
1793 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO);
1794 if (bestchan == NULL) {
1795 /* should never happen ?? */
1799 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) {
1801 * Manual/background scan, don't select+join the
1802 * bss, just return. The scanning framework will
1803 * handle notification that this has completed.
1805 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1808 ieee80211_create_ibss(vap,
1809 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht));
1813 static const struct ieee80211_scanner ap_default = {
1814 .scan_name = "default",
1815 .scan_attach = sta_attach,
1816 .scan_detach = sta_detach,
1817 .scan_start = ap_start,
1818 .scan_restart = sta_restart,
1819 .scan_cancel = ap_cancel,
1821 .scan_flush = sta_flush,
1822 .scan_pickchan = ap_pick_channel,
1823 .scan_add = sta_add,
1824 .scan_age = adhoc_age,
1825 .scan_iterate = sta_iterate,
1826 .scan_assoc_success = sta_assoc_success,
1827 .scan_assoc_fail = sta_assoc_fail,
1829 IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default);
1831 #ifdef IEEE80211_SUPPORT_MESH
1833 * Pick an mbss network to join or find a channel
1834 * to use to start an mbss network.
1837 mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap)
1839 struct sta_table *st = ss->ss_priv;
1840 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1841 struct sta_entry *selbs;
1842 struct ieee80211_channel *chan;
1844 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1845 ("wrong opmode %u", vap->iv_opmode));
1847 if (st->st_newscan) {
1848 sta_update_notseen(st);
1851 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) {
1853 * Manual/background scan, don't select+join the
1854 * bss, just return. The scanning framework will
1855 * handle notification that this has completed.
1857 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
1861 * Automatic sequencing; look for a candidate and
1862 * if found join the network.
1864 /* NB: unlocked read should be ok */
1865 if (TAILQ_FIRST(&st->st_entry) == NULL) {
1866 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1867 "%s: no scan candidate\n", __func__);
1868 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1871 if (ms->ms_idlen != 0) {
1873 * No existing mbss network to join and we have
1874 * a meshid; start one up. If no channel was
1875 * specified, try to select a channel.
1877 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC ||
1878 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
1879 struct ieee80211com *ic = vap->iv_ic;
1881 chan = adhoc_pick_channel(ss, 0);
1883 chan = ieee80211_ht_adjust_channel(ic,
1884 chan, vap->iv_flags_ht);
1886 chan = vap->iv_des_chan;
1888 ieee80211_create_ibss(vap, chan);
1893 * If nothing suitable was found decrement
1894 * the failure counts so entries will be
1895 * reconsidered the next time around. We
1896 * really want to do this only for sta's
1897 * where we've previously had some success.
1901 return 0; /* restart scan */
1903 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN);
1904 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN)
1905 return (selbs != NULL);
1908 chan = selbs->base.se_chan;
1909 if (selbs->se_flags & STA_DEMOTE11B)
1910 chan = demote11b(vap, chan);
1911 if (!ieee80211_sta_join(vap, chan, &selbs->base))
1913 return 1; /* terminate scan */
1916 static const struct ieee80211_scanner mesh_default = {
1917 .scan_name = "default",
1918 .scan_attach = sta_attach,
1919 .scan_detach = sta_detach,
1920 .scan_start = adhoc_start,
1921 .scan_restart = sta_restart,
1922 .scan_cancel = sta_cancel,
1923 .scan_end = mesh_pick_bss,
1924 .scan_flush = sta_flush,
1925 .scan_pickchan = adhoc_pick_channel,
1926 .scan_add = sta_add,
1927 .scan_age = adhoc_age,
1928 .scan_iterate = sta_iterate,
1929 .scan_assoc_fail = sta_assoc_fail,
1930 .scan_assoc_success = sta_assoc_success,
1932 IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default);
1933 #endif /* IEEE80211_SUPPORT_MESH */