diff options
Diffstat (limited to 'sys/net80211/ieee80211_scan_sta.c')
| -rw-r--r-- | sys/net80211/ieee80211_scan_sta.c | 89 |
1 files changed, 72 insertions, 17 deletions
diff --git a/sys/net80211/ieee80211_scan_sta.c b/sys/net80211/ieee80211_scan_sta.c index debbdfb..e3a4bda 100644 --- a/sys/net80211/ieee80211_scan_sta.c +++ b/sys/net80211/ieee80211_scan_sta.c @@ -73,8 +73,7 @@ struct sta_entry { 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 +#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ uint32_t se_avgrssi; /* LPF rssi state */ unsigned long se_lastupdate; /* time of last update */ unsigned long se_lastfail; /* time of last failure */ @@ -107,16 +106,16 @@ static void sta_flush_table(struct sta_table *); * contents explains why. The following flags are or'd to to this * mask and can be used to figure out why the entry was rejected. */ -#define MATCH_CHANNEL 0x001 /* channel mismatch */ -#define MATCH_CAPINFO 0x002 /* capabilities mismatch, e.g. no ess */ -#define MATCH_PRIVACY 0x004 /* privacy mismatch */ -#define MATCH_RATE 0x008 /* rate set mismatch */ -#define MATCH_SSID 0x010 /* ssid mismatch */ -#define MATCH_BSSID 0x020 /* bssid mismatch */ -#define MATCH_FAILS 0x040 /* too many failed auth attempts */ -#define MATCH_NOTSEEN 0x080 /* not seen in recent scans */ -#define MATCH_RSSI 0x100 /* rssi deemed too low to use */ -#define MATCH_CC 0x200 /* country code mismatch */ +#define MATCH_CHANNEL 0x0001 /* channel mismatch */ +#define MATCH_CAPINFO 0x0002 /* capabilities mismatch, e.g. no ess */ +#define MATCH_PRIVACY 0x0004 /* privacy mismatch */ +#define MATCH_RATE 0x0008 /* rate set mismatch */ +#define MATCH_SSID 0x0010 /* ssid mismatch */ +#define MATCH_BSSID 0x0020 /* bssid mismatch */ +#define MATCH_FAILS 0x0040 /* too many failed auth attempts */ +#define MATCH_NOTSEEN 0x0080 /* not seen in recent scans */ +#define MATCH_RSSI 0x0100 /* rssi deemed too low to use */ +#define MATCH_CC 0x0200 /* country code mismatch */ static int match_bss(struct ieee80211vap *, const struct ieee80211_scan_state *, struct sta_entry *, int); static void adhoc_age(struct ieee80211_scan_state *); @@ -675,6 +674,26 @@ sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) ((uint16_t) \ ((((const uint8_t *)(p))[0] ) | \ (((const uint8_t *)(p))[1] << 8))) + +/* + * Demote any supplied 11g channel to 11b. There should + * always be an 11b channel but we check anyway... + */ +static struct ieee80211_channel * +demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) +{ + struct ieee80211_channel *c; + + if (IEEE80211_IS_CHAN_ANYG(chan) && + vap->iv_des_mode == IEEE80211_MODE_AUTO) { + c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, + (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | + IEEE80211_CHAN_B); + if (c != NULL) + chan = c; + } + return chan; +} static int maxrate(const struct ieee80211_scan_entry *se) @@ -774,7 +793,8 @@ sta_compare(const struct sta_entry *a, const struct sta_entry *b) * XXX inspect MCS for HT */ static int -check_rate(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se) +check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, + const struct ieee80211_scan_entry *se) { #define RV(v) ((v) & IEEE80211_RATE_VAL) const struct ieee80211_rateset *srs; @@ -783,11 +803,11 @@ check_rate(struct ieee80211vap *vap, const struct ieee80211_scan_entry *se) okrate = badrate = 0; - srs = ieee80211_get_suprates(vap->iv_ic, se->se_chan); + srs = ieee80211_get_suprates(vap->iv_ic, chan); nrs = se->se_rates[1]; rs = se->se_rates+2; /* XXX MCS */ - ucastrate = vap->iv_txparms[ieee80211_chan2mode(se->se_chan)].ucastrate; + ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; fixedrate = IEEE80211_FIXED_RATE_NONE; again: for (i = 0; i < nrs; i++) { @@ -903,9 +923,38 @@ match_bss(struct ieee80211vap *vap, if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) fail |= MATCH_PRIVACY; } - rate = check_rate(vap, se); - if (rate & IEEE80211_RATE_BASIC) + se0->se_flags &= ~STA_DEMOTE11B; + rate = check_rate(vap, se->se_chan, se); + if (rate & IEEE80211_RATE_BASIC) { fail |= MATCH_RATE; + /* + * An 11b-only ap will give a rate mismatch if there is an + * OFDM fixed tx rate for 11g. Try downgrading the channel + * in the scan list to 11b and retry the rate check. + */ + if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { + rate = check_rate(vap, demote11b(vap, se->se_chan), se); + if ((rate & IEEE80211_RATE_BASIC) == 0) { + fail &= ~MATCH_RATE; + se0->se_flags |= STA_DEMOTE11B; + } + } + } else if (rate < 2*24) { + /* + * This is an 11b-only ap. Check the desired mode in + * case that needs to be honored (mode 11g filters out + * 11b-only ap's). Otherwise force any 11g channel used + * in scanning to be demoted. + * + * NB: we cheat a bit here by looking at the max rate; + * we could/should check the rates. + */ + if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || + vap->iv_des_mode == IEEE80211_MODE_11B)) + fail |= MATCH_RATE; + else + se0->se_flags |= STA_DEMOTE11B; + } if (ss->ss_nssid != 0 && !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) fail |= MATCH_SSID; @@ -1060,6 +1109,8 @@ notfound: if (selbs == NULL) goto notfound; chan = selbs->base.se_chan; + if (selbs->se_flags & STA_DEMOTE11B) + chan = demote11b(vap, chan); if (!ieee80211_sta_join(vap, chan, &selbs->base)) goto notfound; return 1; /* terminate scan */ @@ -1151,6 +1202,8 @@ sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) curRate, roamRate, curRssi, roamRssi); chan = selbs->base.se_chan; + if (selbs->se_flags & STA_DEMOTE11B) + chan = demote11b(vap, chan); (void) ieee80211_sta_join(vap, chan, &selbs->base); } } @@ -1430,6 +1483,8 @@ notfound: if (selbs == NULL) goto notfound; chan = selbs->base.se_chan; + if (selbs->se_flags & STA_DEMOTE11B) + chan = demote11b(vap, chan); if (!ieee80211_sta_join(vap, chan, &selbs->base)) goto notfound; return 1; /* terminate scan */ |
