diff options
Diffstat (limited to 'sys/net80211/ieee80211_scan_sta.c')
| -rw-r--r-- | sys/net80211/ieee80211_scan_sta.c | 1438 |
1 files changed, 1438 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_scan_sta.c b/sys/net80211/ieee80211_scan_sta.c new file mode 100644 index 000000000000..7bd04c83ec43 --- /dev/null +++ b/sys/net80211/ieee80211_scan_sta.c @@ -0,0 +1,1438 @@ +/*- + * Copyright (c) 2002-2007 Sam Leffler, Errno Consulting + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * IEEE 802.11 station scanning support. + */ +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> + +#include <sys/socket.h> + +#include <net/if.h> +#include <net/if_media.h> +#include <net/ethernet.h> + +#include <net80211/ieee80211_var.h> + +#include <net/bpf.h> + +/* + * Parameters for managing cache entries: + * + * o a station with STA_FAILS_MAX failures is not considered + * when picking a candidate + * o a station that hasn't had an update in STA_PURGE_SCANS + * (background) scans is discarded + * o after STA_FAILS_AGE seconds we clear the failure count + */ +#define STA_FAILS_MAX 2 /* assoc failures before ignored */ +#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ +#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ + +/* XXX tunable */ +#define STA_RSSI_MIN 8 /* min acceptable rssi */ +#define STA_RSSI_MAX 40 /* max rssi for comparison */ + +#define RSSI_LPF_LEN 10 +#define RSSI_EP_MULTIPLIER (1<<7) /* pow2 to optimize out * and / */ +#define RSSI_IN(x) ((x) * RSSI_EP_MULTIPLIER) +#define LPF_RSSI(x, y, len) (((x) * ((len) - 1) + (y)) / (len)) +#define RSSI_LPF(x, y) do { \ + if ((y) >= -20) \ + x = LPF_RSSI((x), RSSI_IN((y)), RSSI_LPF_LEN); \ +} while (0) +#define EP_RND(x, mul) \ + ((((x)%(mul)) >= ((mul)/2)) ? howmany(x, mul) : (x)/(mul)) +#define RSSI_GET(x) EP_RND(x, RSSI_EP_MULTIPLIER) + +struct sta_entry { + struct ieee80211_scan_entry base; + TAILQ_ENTRY(sta_entry) se_list; + LIST_ENTRY(sta_entry) se_hash; + uint8_t se_fails; /* failure to associate count */ + uint8_t se_seen; /* seen during current scan */ + uint8_t se_notseen; /* not seen in previous scans */ + uint8_t se_flags; +#define STA_SSID_MATCH 0x01 +#define STA_BSSID_MATCH 0x02 + uint32_t se_avgrssi; /* LPF rssi state */ + unsigned long se_lastupdate; /* time of last update */ + unsigned long se_lastfail; /* time of last failure */ + unsigned long se_lastassoc; /* time of last association */ + u_int se_scangen; /* iterator scan gen# */ +}; + +#define STA_HASHSIZE 32 +/* simple hash is enough for variation of macaddr */ +#define STA_HASH(addr) \ + (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) + +struct sta_table { + struct mtx st_lock; /* on scan table */ + TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ + LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; + struct mtx st_scanlock; /* on st_scangen */ + u_int st_scangen; /* gen# for iterator */ + int st_newscan; +}; + +static void sta_flush_table(struct sta_table *); +static int match_bss(struct ieee80211com *, + const struct ieee80211_scan_state *, struct sta_entry *, int); + +/* number of references from net80211 layer */ +static int nrefs = 0; + +/* + * Attach prior to any scanning work. + */ +static int +sta_attach(struct ieee80211_scan_state *ss) +{ + struct sta_table *st; + + MALLOC(st, struct sta_table *, sizeof(struct sta_table), + M_80211_SCAN, M_NOWAIT | M_ZERO); + if (st == NULL) + return 0; + mtx_init(&st->st_lock, "scantable", "802.11 scan table", MTX_DEF); + mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); + TAILQ_INIT(&st->st_entry); + ss->ss_priv = st; + nrefs++; /* NB: we assume caller locking */ + return 1; +} + +/* + * Cleanup any private state. + */ +static int +sta_detach(struct ieee80211_scan_state *ss) +{ + struct sta_table *st = ss->ss_priv; + + if (st != NULL) { + sta_flush_table(st); + mtx_destroy(&st->st_lock); + mtx_destroy(&st->st_scanlock); + FREE(st, M_80211_SCAN); + KASSERT(nrefs > 0, ("imbalanced attach/detach")); + nrefs--; /* NB: we assume caller locking */ + } + return 1; +} + +/* + * Flush all per-scan state. + */ +static int +sta_flush(struct ieee80211_scan_state *ss) +{ + struct sta_table *st = ss->ss_priv; + + mtx_lock(&st->st_lock); + sta_flush_table(st); + mtx_unlock(&st->st_lock); + ss->ss_last = 0; + return 0; +} + +/* + * Flush all entries in the scan cache. + */ +static void +sta_flush_table(struct sta_table *st) +{ + struct sta_entry *se, *next; + + TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { + TAILQ_REMOVE(&st->st_entry, se, se_list); + LIST_REMOVE(se, se_hash); + FREE(se, M_80211_SCAN); + } +} + +static void +saveie(uint8_t **iep, const uint8_t *ie) +{ + + if (ie == NULL) + *iep = NULL; + else + ieee80211_saveie(iep, ie); +} + +/* + * Process a beacon or probe response frame; create an + * entry in the scan cache or update any previous entry. + */ +static int +sta_add(struct ieee80211_scan_state *ss, + const struct ieee80211_scanparams *sp, + const struct ieee80211_frame *wh, + int subtype, int rssi, int noise, int rstamp) +{ +#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) +#define PICK1ST(_ss) \ + ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ + IEEE80211_SCAN_PICK1ST) + struct sta_table *st = ss->ss_priv; + const uint8_t *macaddr = wh->i_addr2; + struct ieee80211com *ic = ss->ss_ic; + struct sta_entry *se; + struct ieee80211_scan_entry *ise; + int hash; + + hash = STA_HASH(macaddr); + + mtx_lock(&st->st_lock); + LIST_FOREACH(se, &st->st_hash[hash], se_hash) + if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) + goto found; + MALLOC(se, struct sta_entry *, sizeof(struct sta_entry), + M_80211_SCAN, M_NOWAIT | M_ZERO); + if (se == NULL) { + mtx_unlock(&st->st_lock); + return 0; + } + se->se_scangen = st->st_scangen-1; + IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); + TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); + LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); +found: + ise = &se->base; + /* XXX ap beaconing multiple ssid w/ same bssid */ + if (sp->ssid[1] != 0 && + (ISPROBE(subtype) || ise->se_ssid[1] == 0)) + memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); + KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, + ("rate set too large: %u", sp->rates[1])); + memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); + if (sp->xrates != NULL) { + /* XXX validate xrates[1] */ + KASSERT(sp->xrates[1] + sp->rates[1] <= IEEE80211_RATE_MAXSIZE, + ("xrate set too large: %u", sp->xrates[1])); + memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); + } else + ise->se_xrates[1] = 0; + IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); + /* + * Record rssi data using extended precision LPF filter. + */ + if (se->se_lastupdate == 0) /* first sample */ + se->se_avgrssi = RSSI_IN(rssi); + else /* avg w/ previous samples */ + RSSI_LPF(se->se_avgrssi, rssi); + se->base.se_rssi = RSSI_GET(se->se_avgrssi); + se->base.se_noise = noise; + ise->se_rstamp = rstamp; + memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); + ise->se_intval = sp->bintval; + ise->se_capinfo = sp->capinfo; + ise->se_chan = ic->ic_curchan; + ise->se_fhdwell = sp->fhdwell; + ise->se_fhindex = sp->fhindex; + ise->se_erp = sp->erp; + ise->se_timoff = sp->timoff; + if (sp->tim != NULL) { + const struct ieee80211_tim_ie *tim = + (const struct ieee80211_tim_ie *) sp->tim; + ise->se_dtimperiod = tim->tim_period; + } + saveie(&ise->se_wme_ie, sp->wme); + saveie(&ise->se_wpa_ie, sp->wpa); + saveie(&ise->se_rsn_ie, sp->rsn); + saveie(&ise->se_ath_ie, sp->ath); + saveie(&ise->se_htcap_ie, sp->htcap); + saveie(&ise->se_htinfo_ie, sp->htinfo); + + /* clear failure count after STA_FAIL_AGE passes */ + if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { + se->se_fails = 0; + IEEE80211_NOTE_MAC(ic, IEEE80211_MSG_SCAN, macaddr, + "%s: fails %u", __func__, se->se_fails); + } + + se->se_lastupdate = ticks; /* update time */ + se->se_seen = 1; + se->se_notseen = 0; + + mtx_unlock(&st->st_lock); + + /* + * If looking for a quick choice and nothing's + * been found check here. + */ + if (PICK1ST(ss) && match_bss(ic, ss, se, IEEE80211_MSG_SCAN) == 0) + ss->ss_flags |= IEEE80211_SCAN_GOTPICK; + + return 1; +#undef PICK1ST +#undef ISPROBE +} + +/* + * Check if a channel is excluded by user request. + */ +static int +isexcluded(struct ieee80211com *ic, const struct ieee80211_channel *c) +{ + return (isclr(ic->ic_chan_active, c->ic_ieee) || + (ic->ic_des_chan != IEEE80211_CHAN_ANYC && + c->ic_freq != ic->ic_des_chan->ic_freq)); +} + +static struct ieee80211_channel * +find11gchannel(struct ieee80211com *ic, int i, int freq) +{ + struct ieee80211_channel *c; + int j; + + /* + * The normal ordering in the channel list is b channel + * immediately followed by g so optimize the search for + * this. We'll still do a full search just in case. + */ + for (j = i+1; j < ic->ic_nchans; j++) { + c = &ic->ic_channels[j]; + if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) + return c; + } + for (j = 0; j < i; j++) { + c = &ic->ic_channels[j]; + if (c->ic_freq == freq && IEEE80211_IS_CHAN_ANYG(c)) + return c; + } + return NULL; +} +static const u_int chanflags[IEEE80211_MODE_MAX] = { + IEEE80211_CHAN_B, /* IEEE80211_MODE_AUTO */ + IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ + IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ + IEEE80211_CHAN_G, /* IEEE80211_MODE_11G */ + IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ + IEEE80211_CHAN_A, /* IEEE80211_MODE_TURBO_A (check base channel)*/ + IEEE80211_CHAN_G, /* IEEE80211_MODE_TURBO_G */ + IEEE80211_CHAN_ST, /* IEEE80211_MODE_STURBO_A */ + IEEE80211_CHAN_A, /* IEEE80211_MODE_11NA (check legacy) */ + IEEE80211_CHAN_G, /* IEEE80211_MODE_11NG (check legacy) */ +}; + +static void +add_channels(struct ieee80211com *ic, + struct ieee80211_scan_state *ss, + enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) +{ +#define N(a) (sizeof(a) / sizeof(a[0])) + struct ieee80211_channel *c, *cg; + u_int modeflags; + int i; + + KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); + modeflags = chanflags[mode]; + for (i = 0; i < nfreq; i++) { + if (ss->ss_last >= IEEE80211_SCAN_MAX) + break; + + c = ieee80211_find_channel(ic, freq[i], modeflags); + if (c == NULL || isexcluded(ic, c)) + continue; + if (mode == IEEE80211_MODE_AUTO) { + /* + * XXX special-case 11b/g channels so we select + * the g channel if both are present. + */ + if (IEEE80211_IS_CHAN_B(c) && + (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) + c = cg; + } + ss->ss_chans[ss->ss_last++] = c; + } +#undef N +} + +static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ +{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; +static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ +{ 5170, 5190, 5210, 5230 }; +static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ +{ 2412, 2437, 2462, 2442, 2472 }; +static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ +{ 5745, 5765, 5785, 5805, 5825 }; +static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ +{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; +static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ +{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; +static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ +{ 2484 }; +static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ +{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; +static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ +{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; +#ifdef ATH_TURBO_SCAN +static const uint16_t rcl5[] = /* 3 static turbo channels */ +{ 5210, 5250, 5290 }; +static const uint16_t rcl6[] = /* 2 static turbo channels */ +{ 5760, 5800 }; +static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ +{ 5540, 5580, 5620, 5660 }; +static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ +{ 2437 }; +static const uint16_t rcl13[] = /* dynamic Turbo channels */ +{ 5200, 5240, 5280, 5765, 5805 }; +#endif /* ATH_TURBO_SCAN */ + +struct scanlist { + uint16_t mode; + uint16_t count; + const uint16_t *list; +}; + +#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a + +static const struct scanlist staScanTable[] = { + { IEEE80211_MODE_11B, X(rcl3) }, + { IEEE80211_MODE_11A, X(rcl1) }, + { IEEE80211_MODE_11A, X(rcl2) }, + { IEEE80211_MODE_11B, X(rcl8) }, + { IEEE80211_MODE_11B, X(rcl9) }, + { IEEE80211_MODE_11A, X(rcl4) }, +#ifdef ATH_TURBO_SCAN + { IEEE80211_MODE_STURBO_A, X(rcl5) }, + { IEEE80211_MODE_STURBO_A, X(rcl6) }, + { IEEE80211_MODE_TURBO_A, X(rcl6x) }, + { IEEE80211_MODE_TURBO_A, X(rcl13) }, +#endif /* ATH_TURBO_SCAN */ + { IEEE80211_MODE_11A, X(rcl7) }, + { IEEE80211_MODE_11B, X(rcl10) }, + { IEEE80211_MODE_11A, X(rcl11) }, +#ifdef ATH_TURBO_SCAN + { IEEE80211_MODE_TURBO_G, X(rcl12) }, +#endif /* ATH_TURBO_SCAN */ + { .list = NULL } +}; + +static int +checktable(const struct scanlist *scan, const struct ieee80211_channel *c) +{ + int i; + + for (; scan->list != NULL; scan++) { + for (i = 0; i < scan->count; i++) + if (scan->list[i] == c->ic_freq) + return 1; + } + return 0; +} + +/* + * Start a station-mode scan by populating the channel list. + */ +static int +sta_start(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ +#define N(a) (sizeof(a)/sizeof(a[0])) + struct sta_table *st = ss->ss_priv; + const struct scanlist *scan; + enum ieee80211_phymode mode; + struct ieee80211_channel *c; + int i; + + ss->ss_last = 0; + /* + * Use the table of ordered channels to construct the list + * of channels for scanning. Any channels in the ordered + * list not in the master list will be discarded. + */ + for (scan = staScanTable; scan->list != NULL; scan++) { + mode = scan->mode; + if (ic->ic_des_mode != IEEE80211_MODE_AUTO) { + /* + * If a desired mode was specified, scan only + * channels that satisfy that constraint. + */ + if (ic->ic_des_mode != mode) { + /* + * The scan table marks 2.4Ghz channels as b + * so if the desired mode is 11g, then use + * the 11b channel list but upgrade the mode. + */ + if (ic->ic_des_mode != IEEE80211_MODE_11G || + mode != IEEE80211_MODE_11B) + continue; + mode = IEEE80211_MODE_11G; /* upgrade */ + } + } else { + /* + * This lets add_channels upgrade an 11b channel + * to 11g if available. + */ + if (mode == IEEE80211_MODE_11B) + mode = IEEE80211_MODE_AUTO; + } +#ifdef IEEE80211_F_XR + /* XR does not operate on turbo channels */ + if ((ic->ic_flags & IEEE80211_F_XR) && + (mode == IEEE80211_MODE_TURBO_A || + mode == IEEE80211_MODE_TURBO_G || + mode == IEEE80211_MODE_STURBO_A)) + continue; +#endif + /* + * Add the list of the channels; any that are not + * in the master channel list will be discarded. + */ + add_channels(ic, ss, mode, scan->list, scan->count); + } + + /* + * Add the channels from the ic (from HAL) that are not present + * in the staScanTable. + */ + for (i = 0; i < ic->ic_nchans; i++) { + if (ss->ss_last >= IEEE80211_SCAN_MAX) + break; + + c = &ic->ic_channels[i]; + /* + * Ignore dynamic turbo channels; we scan them + * in normal mode (i.e. not boosted). Likewise + * for HT channels, they get scanned using + * legacy rates. + */ + if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) + continue; + + /* + * If a desired mode was specified, scan only + * channels that satisfy that constraint. + */ + if (ic->ic_des_mode != IEEE80211_MODE_AUTO && + ic->ic_des_mode != ieee80211_chan2mode(c)) + continue; + + /* + * Skip channels excluded by user request. + */ + if (isexcluded(ic, c)) + continue; + + /* + * Add the channel unless it is listed in the + * fixed scan order tables. This insures we + * don't sweep back in channels we filtered out + * above. + */ + if (checktable(staScanTable, c)) + continue; + + /* Add channel to scanning list. */ + ss->ss_chans[ss->ss_last++] = c; + } + + ss->ss_next = 0; + /* XXX tunables */ + ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ + ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ + +#ifdef IEEE80211_DEBUG + if (ieee80211_msg_scan(ic)) { + if_printf(ic->ic_ifp, "scan set "); + ieee80211_scan_dump_channels(ss); + printf(" dwell min %ld max %ld\n", + ss->ss_mindwell, ss->ss_maxdwell); + } +#endif /* IEEE80211_DEBUG */ + + st->st_newscan = 1; + + return 0; +#undef N +} + +/* + * Restart a bg scan. + */ +static int +sta_restart(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ + struct sta_table *st = ss->ss_priv; + + st->st_newscan = 1; + return 0; +} + +/* + * Cancel an ongoing scan. + */ +static int +sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ + return 0; +} + +static uint8_t +maxrate(const struct ieee80211_scan_entry *se) +{ + uint8_t rmax, r; + int i; + + rmax = 0; + for (i = 0; i < se->se_rates[1]; i++) { + r = se->se_rates[2+i] & IEEE80211_RATE_VAL; + if (r > rmax) + rmax = r; + } + for (i = 0; i < se->se_xrates[1]; i++) { + r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; + if (r > rmax) + rmax = r; + } + return rmax; +} + +/* + * Compare the capabilities of two entries and decide which is + * more desirable (return >0 if a is considered better). Note + * that we assume compatibility/usability has already been checked + * so we don't need to (e.g. validate whether privacy is supported). + * Used to select the best scan candidate for association in a BSS. + */ +static int +sta_compare(const struct sta_entry *a, const struct sta_entry *b) +{ +#define PREFER(_a,_b,_what) do { \ + if (((_a) ^ (_b)) & (_what)) \ + return ((_a) & (_what)) ? 1 : -1; \ +} while (0) + uint8_t maxa, maxb; + int8_t rssia, rssib; + int weight; + + /* desired bssid */ + PREFER(a->se_flags, b->se_flags, STA_BSSID_MATCH); + /* desired ssid */ + PREFER(a->se_flags, b->se_flags, STA_SSID_MATCH); + /* privacy support */ + PREFER(a->base.se_capinfo, b->base.se_capinfo, + IEEE80211_CAPINFO_PRIVACY); + + /* compare count of previous failures */ + weight = b->se_fails - a->se_fails; + if (abs(weight) > 1) + return weight; + + /* + * Compare rssi. If the two are considered equivalent + * then fallback to other criteria. We threshold the + * comparisons to avoid selecting an ap purely by rssi + * when both values may be good but one ap is otherwise + * more desirable (e.g. an 11b-only ap with stronger + * signal than an 11g ap). + */ + rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); + rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); + if (abs(rssib - rssia) < 5) { + /* best/max rate preferred if signal level close enough XXX */ + maxa = maxrate(&a->base); + maxb = maxrate(&b->base); + if (maxa != maxb) + return maxa - maxb; + /* XXX use freq for channel preference */ + /* for now just prefer 5Ghz band to all other bands */ + if (IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) && + !IEEE80211_IS_CHAN_5GHZ(b->base.se_chan)) + return 1; + if (!IEEE80211_IS_CHAN_5GHZ(a->base.se_chan) && + IEEE80211_IS_CHAN_5GHZ(b->base.se_chan)) + return -1; + } + /* all things being equal, use signal level */ + return a->base.se_rssi - b->base.se_rssi; +#undef PREFER +} + +/* + * Check rate set suitability and return the best supported rate. + */ +static int +check_rate(struct ieee80211com *ic, const struct ieee80211_scan_entry *se) +{ +#define RV(v) ((v) & IEEE80211_RATE_VAL) + const struct ieee80211_rateset *srs; + int i, j, nrs, r, okrate, badrate, fixedrate; + const uint8_t *rs; + + okrate = badrate = fixedrate = 0; + + srs = ieee80211_get_suprates(ic, se->se_chan); + nrs = se->se_rates[1]; + rs = se->se_rates+2; + fixedrate = IEEE80211_FIXED_RATE_NONE; +again: + for (i = 0; i < nrs; i++) { + r = RV(rs[i]); + badrate = r; + /* + * Check any fixed rate is included. + */ + if (r == ic->ic_fixed_rate) + fixedrate = r; + /* + * Check against our supported rates. + */ + for (j = 0; j < srs->rs_nrates; j++) + if (r == RV(srs->rs_rates[j])) { + if (r > okrate) /* NB: track max */ + okrate = r; + break; + } + + if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { + /* + * Don't try joining a BSS, if we don't support + * one of its basic rates. + */ + okrate = 0; + goto back; + } + } + if (rs == se->se_rates+2) { + /* scan xrates too; sort of an algol68-style for loop */ + nrs = se->se_xrates[1]; + rs = se->se_xrates+2; + goto again; + } + +back: + if (okrate == 0 || ic->ic_fixed_rate != fixedrate) + return badrate | IEEE80211_RATE_BASIC; + else + return RV(okrate); +#undef RV +} + +static int +match_ssid(const uint8_t *ie, + int nssid, const struct ieee80211_scan_ssid ssids[]) +{ + int i; + + for (i = 0; i < nssid; i++) { + if (ie[1] == ssids[i].len && + memcmp(ie+2, ssids[i].ssid, ie[1]) == 0) + return 1; + } + return 0; +} + +/* + * Test a scan candidate for suitability/compatibility. + */ +static int +match_bss(struct ieee80211com *ic, + const struct ieee80211_scan_state *ss, struct sta_entry *se0, + int debug) +{ + struct ieee80211_scan_entry *se = &se0->base; + uint8_t rate; + int fail; + + fail = 0; + if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) + fail |= 0x01; + /* + * NB: normally the desired mode is used to construct + * the channel list, but it's possible for the scan + * cache to include entries for stations outside this + * list so we check the desired mode here to weed them + * out. + */ + if (ic->ic_des_mode != IEEE80211_MODE_AUTO && + (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != + chanflags[ic->ic_des_mode]) + fail |= 0x01; + if (ic->ic_opmode == IEEE80211_M_IBSS) { + if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) + fail |= 0x02; + } else { + if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) + fail |= 0x02; + } + if (ic->ic_flags & IEEE80211_F_PRIVACY) { + if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) + fail |= 0x04; + } else { + /* XXX does this mean privacy is supported or required? */ + if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) + fail |= 0x04; + } + rate = check_rate(ic, se); + if (rate & IEEE80211_RATE_BASIC) + fail |= 0x08; + if (ss->ss_nssid != 0 && + match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) + se0->se_flags |= STA_SSID_MATCH; + else + se0->se_flags &= ~STA_SSID_MATCH; + if ((ic->ic_flags & IEEE80211_F_DESBSSID) && + IEEE80211_ADDR_EQ(ic->ic_des_bssid, se->se_bssid)) + se0->se_flags |= STA_BSSID_MATCH; + else + se0->se_flags &= ~STA_BSSID_MATCH; + if (se0->se_fails >= STA_FAILS_MAX) + fail |= 0x40; + if (se0->se_notseen >= STA_PURGE_SCANS) + fail |= 0x80; + if (se->se_rssi < STA_RSSI_MIN) + fail |= 0x100; +#ifdef IEEE80211_DEBUG + if (ieee80211_msg(ic, debug)) { + printf(" %c %s", + fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+', + ether_sprintf(se->se_macaddr)); + printf(" %s%c", ether_sprintf(se->se_bssid), + se0->se_flags & STA_BSSID_MATCH ? '*' : ' '); + printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), + fail & 0x01 ? '!' : ' '); + printf(" %+4d%c", se->se_rssi, fail & 0x100 ? '!' : ' '); + printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, + fail & 0x08 ? '!' : ' '); + printf(" %4s%c", + (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : + (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : + "????", + fail & 0x02 ? '!' : ' '); + printf(" %3s%c ", + (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? + "wep" : "no", + fail & 0x04 ? '!' : ' '); + ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); + printf("%s\n", se0->se_flags & STA_SSID_MATCH ? "*" : ""); + } +#endif + return fail; +} + +static void +sta_update_notseen(struct sta_table *st) +{ + struct sta_entry *se; + + mtx_lock(&st->st_lock); + TAILQ_FOREACH(se, &st->st_entry, se_list) { + /* + * If seen the reset and don't bump the count; + * otherwise bump the ``not seen'' count. Note + * that this insures that stations for which we + * see frames while not scanning but not during + * this scan will not be penalized. + */ + if (se->se_seen) + se->se_seen = 0; + else + se->se_notseen++; + } + mtx_unlock(&st->st_lock); +} + +static void +sta_dec_fails(struct sta_table *st) +{ + struct sta_entry *se; + + mtx_lock(&st->st_lock); + TAILQ_FOREACH(se, &st->st_entry, se_list) + if (se->se_fails) + se->se_fails--; + mtx_unlock(&st->st_lock); +} + +static struct sta_entry * +select_bss(struct ieee80211_scan_state *ss, struct ieee80211com *ic, int debug) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se, *selbs = NULL; + + IEEE80211_DPRINTF(ic, debug, " %s\n", + "macaddr bssid chan rssi rate flag wep essid"); + mtx_lock(&st->st_lock); + TAILQ_FOREACH(se, &st->st_entry, se_list) { + if (match_bss(ic, ss, se, debug) == 0) { + if (selbs == NULL) + selbs = se; + else if (sta_compare(se, selbs) > 0) + selbs = se; + } + } + mtx_unlock(&st->st_lock); + + return selbs; +} + +/* + * Pick an ap or ibss network to join or find a channel + * to use to start an ibss network. + */ +static int +sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *selbs; + + KASSERT(ic->ic_opmode == IEEE80211_M_STA, + ("wrong mode %u", ic->ic_opmode)); + + if (st->st_newscan) { + sta_update_notseen(st); + st->st_newscan = 0; + } + if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { + /* + * Manual/background scan, don't select+join the + * bss, just return. The scanning framework will + * handle notification that this has completed. + */ + ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; + return 1; + } + /* + * Automatic sequencing; look for a candidate and + * if found join the network. + */ + /* NB: unlocked read should be ok */ + if (TAILQ_FIRST(&st->st_entry) == NULL) { + IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, + "%s: no scan candidate\n", __func__); +notfound: + /* + * If nothing suitable was found decrement + * the failure counts so entries will be + * reconsidered the next time around. We + * really want to do this only for sta's + * where we've previously had some success. + */ + sta_dec_fails(st); + st->st_newscan = 1; + return 0; /* restart scan */ + } + selbs = select_bss(ss, ic, IEEE80211_MSG_SCAN); + if (selbs == NULL || !ieee80211_sta_join(ic, &selbs->base)) + goto notfound; + return 1; /* terminate scan */ +} + +/* + * Lookup an entry in the scan cache. We assume we're + * called from the bottom half or such that we don't need + * to block the bottom half so that it's safe to return + * a reference to an entry w/o holding the lock on the table. + */ +static struct sta_entry * +sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) +{ + struct sta_entry *se; + int hash = STA_HASH(macaddr); + + mtx_lock(&st->st_lock); + LIST_FOREACH(se, &st->st_hash[hash], se_hash) + if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) + break; + mtx_unlock(&st->st_lock); + + return se; /* NB: unlocked */ +} + +static void +sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ + struct ieee80211_node *ni = ic->ic_bss; + struct sta_table *st = ss->ss_priv; + struct sta_entry *se, *selbs; + uint8_t roamRate, curRate; + int8_t roamRssi, curRssi; + + se = sta_lookup(st, ni->ni_macaddr); + if (se == NULL) { + /* XXX something is wrong */ + return; + } + + /* XXX do we need 11g too? */ + if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) { + roamRate = ic->ic_roam.rate11b; + roamRssi = ic->ic_roam.rssi11b; + } else if (IEEE80211_IS_CHAN_B(ic->ic_bsschan)) { + roamRate = ic->ic_roam.rate11bOnly; + roamRssi = ic->ic_roam.rssi11bOnly; + } else { + roamRate = ic->ic_roam.rate11a; + roamRssi = ic->ic_roam.rssi11a; + } + /* NB: the most up to date rssi is in the node, not the scan cache */ + curRssi = ic->ic_node_getrssi(ni); + if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) { + curRate = ni->ni_rates.rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL; + IEEE80211_DPRINTF(ic, IEEE80211_MSG_ROAM, + "%s: currssi %d currate %u roamrssi %d roamrate %u\n", + __func__, curRssi, curRate, roamRssi, roamRate); + } else { + curRate = roamRate; /* NB: insure compare below fails */ + IEEE80211_DPRINTF(ic, IEEE80211_MSG_ROAM, + "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); + } + /* + * Check if a new ap should be used and switch. + * XXX deauth current ap + */ + if (curRate < roamRate || curRssi < roamRssi) { + if (time_after(ticks, ic->ic_lastscan + ic->ic_scanvalid)) { + /* + * Scan cache contents are too old; force a scan now + * if possible so we have current state to make a + * decision with. We don't kick off a bg scan if + * we're using dynamic turbo and boosted or if the + * channel is busy. + * XXX force immediate switch on scan complete + */ + if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && + time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)) + ieee80211_bg_scan(ic); + return; + } + se->base.se_rssi = curRssi; + selbs = select_bss(ss, ic, IEEE80211_MSG_ROAM); + if (selbs != NULL && selbs != se) { + IEEE80211_DPRINTF(ic, + IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, + "%s: ROAM: curRate %u, roamRate %u, " + "curRssi %d, roamRssi %d\n", __func__, + curRate, roamRate, curRssi, roamRssi); + ieee80211_sta_join(ic, &selbs->base); + } + } +} + +/* + * Age entries in the scan cache. + * XXX also do roaming since it's convenient + */ +static void +sta_age(struct ieee80211_scan_state *ss) +{ + struct ieee80211com *ic = ss->ss_ic; + struct sta_table *st = ss->ss_priv; + struct sta_entry *se, *next; + + mtx_lock(&st->st_lock); + TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { + if (se->se_notseen > STA_PURGE_SCANS) { + TAILQ_REMOVE(&st->st_entry, se, se_list); + LIST_REMOVE(se, se_hash); + FREE(se, M_80211_SCAN); + } + } + mtx_unlock(&st->st_lock); + /* + * If rate control is enabled check periodically to see if + * we should roam from our current connection to one that + * might be better. This only applies when we're operating + * in sta mode and automatic roaming is set. + * XXX defer if busy + * XXX repeater station + * XXX do when !bgscan? + */ + KASSERT(ic->ic_opmode == IEEE80211_M_STA, + ("wrong mode %u", ic->ic_opmode)); + if (ic->ic_roaming == IEEE80211_ROAMING_AUTO && + (ic->ic_flags & IEEE80211_F_BGSCAN) && + ic->ic_state >= IEEE80211_S_RUN) + /* XXX vap is implicit */ + sta_roam_check(ss, ic); +} + +/* + * Iterate over the entries in the scan cache, invoking + * the callback function on each one. + */ +static void +sta_iterate(struct ieee80211_scan_state *ss, + ieee80211_scan_iter_func *f, void *arg) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se; + u_int gen; + + mtx_lock(&st->st_scanlock); + gen = st->st_scangen++; +restart: + mtx_lock(&st->st_lock); + TAILQ_FOREACH(se, &st->st_entry, se_list) { + if (se->se_scangen != gen) { + se->se_scangen = gen; + /* update public state */ + se->base.se_age = ticks - se->se_lastupdate; + mtx_unlock(&st->st_lock); + (*f)(arg, &se->base); + goto restart; + } + } + mtx_unlock(&st->st_lock); + + mtx_unlock(&st->st_scanlock); +} + +static void +sta_assoc_fail(struct ieee80211_scan_state *ss, + const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se; + + se = sta_lookup(st, macaddr); + if (se != NULL) { + se->se_fails++; + se->se_lastfail = ticks; + IEEE80211_NOTE_MAC(ss->ss_ic, IEEE80211_MSG_SCAN, + macaddr, "%s: reason %u fails %u", + __func__, reason, se->se_fails); + } +} + +static void +sta_assoc_success(struct ieee80211_scan_state *ss, + const uint8_t macaddr[IEEE80211_ADDR_LEN]) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se; + + se = sta_lookup(st, macaddr); + if (se != NULL) { +#if 0 + se->se_fails = 0; + IEEE80211_NOTE_MAC(ss->ss_ic, IEEE80211_MSG_SCAN, + macaddr, "%s: fails %u", + __func__, se->se_fails); +#endif + se->se_lastassoc = ticks; + } +} + +static const struct ieee80211_scanner sta_default = { + .scan_name = "default", + .scan_attach = sta_attach, + .scan_detach = sta_detach, + .scan_start = sta_start, + .scan_restart = sta_restart, + .scan_cancel = sta_cancel, + .scan_end = sta_pick_bss, + .scan_flush = sta_flush, + .scan_add = sta_add, + .scan_age = sta_age, + .scan_iterate = sta_iterate, + .scan_assoc_fail = sta_assoc_fail, + .scan_assoc_success = sta_assoc_success, +}; + +/* + * Adhoc mode-specific support. + */ + +static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ +{ 5180, 5200, 5220, 5240 }; +static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ +{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; +static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ +{ 5170, 5190, 5210, 5230 }; +static const uint16_t adhoc11b[] = /* 10, 11 */ +{ 2457, 2462 }; + +static const struct scanlist adhocScanTable[] = { + { IEEE80211_MODE_11B, X(adhoc11b) }, + { IEEE80211_MODE_11A, X(adhocWorld) }, + { IEEE80211_MODE_11A, X(adhocFcc3) }, + { IEEE80211_MODE_11B, X(adhocMkk) }, + { .list = NULL } +}; +#undef X + +/* + * Start an adhoc-mode scan by populating the channel list. + */ +static int +adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ +#define N(a) (sizeof(a)/sizeof(a[0])) + struct sta_table *st = ss->ss_priv; + const struct scanlist *scan; + enum ieee80211_phymode mode; + + ss->ss_last = 0; + /* + * Use the table of ordered channels to construct the list + * of channels for scanning. Any channels in the ordered + * list not in the master list will be discarded. + */ + for (scan = adhocScanTable; scan->list != NULL; scan++) { + mode = scan->mode; + if (ic->ic_des_mode != IEEE80211_MODE_AUTO) { + /* + * If a desired mode was specified, scan only + * channels that satisfy that constraint. + */ + if (ic->ic_des_mode != mode) { + /* + * The scan table marks 2.4Ghz channels as b + * so if the desired mode is 11g, then use + * the 11b channel list but upgrade the mode. + */ + if (ic->ic_des_mode != IEEE80211_MODE_11G || + mode != IEEE80211_MODE_11B) + continue; + mode = IEEE80211_MODE_11G; /* upgrade */ + } + } else { + /* + * This lets add_channels upgrade an 11b channel + * to 11g if available. + */ + if (mode == IEEE80211_MODE_11B) + mode = IEEE80211_MODE_AUTO; + } +#ifdef IEEE80211_F_XR + /* XR does not operate on turbo channels */ + if ((ic->ic_flags & IEEE80211_F_XR) && + (mode == IEEE80211_MODE_TURBO_A || + mode == IEEE80211_MODE_TURBO_G)) + continue; +#endif + /* + * Add the list of the channels; any that are not + * in the master channel list will be discarded. + */ + add_channels(ic, ss, mode, scan->list, scan->count); + } + ss->ss_next = 0; + /* XXX tunables */ + ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ + ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ + +#ifdef IEEE80211_DEBUG + if (ieee80211_msg_scan(ic)) { + if_printf(ic->ic_ifp, "scan set "); + ieee80211_scan_dump_channels(ss); + printf(" dwell min %ld max %ld\n", + ss->ss_mindwell, ss->ss_maxdwell); + } +#endif /* IEEE80211_DEBUG */ + + st->st_newscan = 1; + + return 0; +#undef N +} + +/* + * Select a channel to start an adhoc network on. + * The channel list was populated with appropriate + * channels so select one that looks least occupied. + * XXX need regulatory domain constraints + */ +static struct ieee80211_channel * +adhoc_pick_channel(struct ieee80211_scan_state *ss) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se; + struct ieee80211_channel *c, *bestchan; + int i, bestrssi, maxrssi; + + bestchan = NULL; + bestrssi = -1; + + mtx_lock(&st->st_lock); + for (i = 0; i < ss->ss_last; i++) { + c = ss->ss_chans[i]; + maxrssi = 0; + TAILQ_FOREACH(se, &st->st_entry, se_list) { + if (se->base.se_chan != c) + continue; + if (se->base.se_rssi > maxrssi) + maxrssi = se->base.se_rssi; + } + if (bestchan == NULL || maxrssi < bestrssi) + bestchan = c; + } + mtx_unlock(&st->st_lock); + + return bestchan; +} + +/* + * Pick an ibss network to join or find a channel + * to use to start an ibss network. + */ +static int +adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211com *ic) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *selbs; + struct ieee80211_channel *chan; + + KASSERT(ic->ic_opmode == IEEE80211_M_IBSS || + ic->ic_opmode == IEEE80211_M_AHDEMO, + ("wrong opmode %u", ic->ic_opmode)); + + if (st->st_newscan) { + sta_update_notseen(st); + st->st_newscan = 0; + } + if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { + /* + * Manual/background scan, don't select+join the + * bss, just return. The scanning framework will + * handle notification that this has completed. + */ + ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; + return 1; + } + /* + * Automatic sequencing; look for a candidate and + * if found join the network. + */ + /* NB: unlocked read should be ok */ + if (TAILQ_FIRST(&st->st_entry) == NULL) { + IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, + "%s: no scan candidate\n", __func__); +notfound: + if (ic->ic_des_nssid) { + /* + * No existing adhoc network to join and we have + * an ssid; start one up. If no channel was + * specified, try to select a channel. + */ + if (ic->ic_des_chan == IEEE80211_CHAN_ANYC) + chan = adhoc_pick_channel(ss); + else + chan = ic->ic_des_chan; + if (chan != NULL) { + ieee80211_create_ibss(ic, chan); + return 1; + } + } + /* + * If nothing suitable was found decrement + * the failure counts so entries will be + * reconsidered the next time around. We + * really want to do this only for sta's + * where we've previously had some success. + */ + sta_dec_fails(st); + st->st_newscan = 1; + return 0; /* restart scan */ + } + selbs = select_bss(ss, ic, IEEE80211_MSG_SCAN); + if (selbs == NULL || !ieee80211_sta_join(ic, &selbs->base)) + goto notfound; + return 1; /* terminate scan */ +} + +/* + * Age entries in the scan cache. + */ +static void +adhoc_age(struct ieee80211_scan_state *ss) +{ + struct sta_table *st = ss->ss_priv; + struct sta_entry *se, *next; + + mtx_lock(&st->st_lock); + TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { + if (se->se_notseen > STA_PURGE_SCANS) { + TAILQ_REMOVE(&st->st_entry, se, se_list); + LIST_REMOVE(se, se_hash); + FREE(se, M_80211_SCAN); + } + } + mtx_unlock(&st->st_lock); +} + +static const struct ieee80211_scanner adhoc_default = { + .scan_name = "default", + .scan_attach = sta_attach, + .scan_detach = sta_detach, + .scan_start = adhoc_start, + .scan_restart = sta_restart, + .scan_cancel = sta_cancel, + .scan_end = adhoc_pick_bss, + .scan_flush = sta_flush, + .scan_add = sta_add, + .scan_age = adhoc_age, + .scan_iterate = sta_iterate, + .scan_assoc_fail = sta_assoc_fail, + .scan_assoc_success = sta_assoc_success, +}; + +/* + * Module glue. + */ +static int +wlan_modevent(module_t mod, int type, void *unused) +{ + switch (type) { + case MOD_LOAD: + ieee80211_scanner_register(IEEE80211_M_STA, &sta_default); + ieee80211_scanner_register(IEEE80211_M_IBSS, &adhoc_default); + ieee80211_scanner_register(IEEE80211_M_AHDEMO, &adhoc_default); + return 0; + case MOD_UNLOAD: + case MOD_QUIESCE: + if (nrefs) { + printf("wlan_scan_sta: still in use (%u dynamic refs)\n", + nrefs); + return EBUSY; + } + if (type == MOD_UNLOAD) { + ieee80211_scanner_unregister_all(&sta_default); + ieee80211_scanner_unregister_all(&adhoc_default); + } + return 0; + } + return EINVAL; +} + +static moduledata_t wlan_mod = { + "wlan_scan_sta", + wlan_modevent, + 0 +}; +DECLARE_MODULE(wlan_scan_sta, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); +MODULE_VERSION(wlan_scan_sta, 1); +MODULE_DEPEND(wlan_scan_sta, wlan, 1, 1, 1); |