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348 lines
10 KiB
Diff
348 lines
10 KiB
Diff
--- a/net80211/ieee80211_scan.c
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+++ b/net80211/ieee80211_scan.c
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@@ -97,6 +97,123 @@ struct scan_state {
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static void scan_restart_pwrsav(unsigned long);
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static void scan_next(unsigned long);
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+spinlock_t channel_lock = SPIN_LOCK_UNLOCKED;
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+static LIST_HEAD(channels_inuse);
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+
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+struct channel_inuse {
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+ struct list_head list;
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+ struct ieee80211com *ic;
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+ u16 freq;
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+ u8 bw;
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+};
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+
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+static inline u32
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+get_signal(u8 bw, u8 distance)
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+{
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+ u32 v;
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+
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+ /* signal = 1 - (distance / bw)^2 [scale: 100] */
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+ v = 100 * distance / bw;
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+ v = (100 - ((v * v) / 100));
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+ return v;
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+}
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+
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+static u32
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+get_overlap(u16 f1, u16 f2, u8 b1, u8 b2)
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+{
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+ u32 v;
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+ u16 d, c;
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+
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+ /* add offsets for sidechannel interference */
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+ b1 += (b1 / 5);
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+ b2 += (b2 / 5);
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+
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+ /* use only one direction */
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+ b1 /= 2;
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+ b2 /= 2;
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+
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+ if (f1 + b1 < f2 - b2)
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+ return 0;
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+
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+ d = f2 - f1;
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+ c = d * b1 / (b1 + b2);
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+ v = get_signal(b1, c);
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+
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+ return v * v / 100;
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+}
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+
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+static u8
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+get_channel_bw(struct ieee80211_channel *c)
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+{
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+ switch(c->ic_flags & (
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+ IEEE80211_CHAN_HALF |
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+ IEEE80211_CHAN_QUARTER |
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+ IEEE80211_CHAN_TURBO |
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+ IEEE80211_CHAN_STURBO)) {
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+ case IEEE80211_CHAN_QUARTER:
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+ return 5;
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+ case IEEE80211_CHAN_HALF:
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+ return 10;
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+ case IEEE80211_CHAN_TURBO:
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+ case IEEE80211_CHAN_STURBO:
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+ return 40;
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+ default:
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+ return 20;
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+ }
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+}
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+
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+/* must be called with channel_lock held */
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+u32
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+ieee80211_scan_get_bias(struct ieee80211_channel *c)
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+{
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+ struct channel_inuse *ch;
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+ u8 bw = get_channel_bw(c);
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+ u32 bias = 0;
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+
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+ list_for_each_entry(ch, &channels_inuse, list) {
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+ if (ch->freq == c->ic_freq) {
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+ bias += 50;
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+ continue;
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+ }
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+ if (c->ic_freq < ch->freq)
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+ bias += get_overlap(c->ic_freq, ch->freq, bw, ch->bw);
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+ else
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+ bias += get_overlap(ch->freq, c->ic_freq, ch->bw, bw);
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+ }
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+ return bias;
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+}
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+EXPORT_SYMBOL(ieee80211_scan_get_bias);
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+
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+/* must be called with channel_lock held */
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+void
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+ieee80211_scan_set_bss_channel(struct ieee80211com *ic, struct ieee80211_channel *c)
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+{
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+ unsigned long flags;
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+ struct channel_inuse *ch;
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+
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+ list_for_each_entry(ch, &channels_inuse, list) {
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+ if (ch->ic == ic)
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+ goto found;
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+ }
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+ ch = NULL;
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+found:
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+ if (c && (c != IEEE80211_CHAN_ANYC)) {
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+ if (!ch) {
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+ ch = kmalloc(sizeof(struct channel_inuse), GFP_ATOMIC);
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+ ch->ic = ic;
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+ INIT_LIST_HEAD(&ch->list);
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+ list_add(&ch->list, &channels_inuse);
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+ }
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+ ch->freq = c->ic_freq;
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+ ch->bw = get_channel_bw(c);
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+ } else if (ch) {
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+ list_del(&ch->list);
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+ kfree(ch);
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+ }
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+}
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+EXPORT_SYMBOL(ieee80211_scan_set_bss_channel);
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+
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+
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void
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ieee80211_scan_attach(struct ieee80211com *ic)
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{
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@@ -1169,7 +1286,7 @@ ieee80211_scan_dfs_action(struct ieee802
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IEEE80211_RADAR_CHANCHANGE_TBTT_COUNT;
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ic->ic_flags |= IEEE80211_F_CHANSWITCH;
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} else {
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-
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+ unsigned long flags;
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
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"%s: directly switching to channel "
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"%3d (%4d MHz)\n", __func__,
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@@ -1180,6 +1297,9 @@ ieee80211_scan_dfs_action(struct ieee802
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* change the channel here. */
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change_channel(ic, new_channel);
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ic->ic_bsschan = new_channel;
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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if (vap->iv_bss)
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vap->iv_bss->ni_chan = new_channel;
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}
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--- a/net80211/ieee80211_scan.h
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+++ b/net80211/ieee80211_scan.h
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@@ -35,6 +35,7 @@
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#define IEEE80211_SCAN_MAX IEEE80211_CHAN_MAX
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+extern spinlock_t channel_lock;
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struct ieee80211_scanner;
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struct ieee80211_scan_entry;
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@@ -116,6 +117,8 @@ void ieee80211_scan_flush(struct ieee802
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struct ieee80211_scan_entry;
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typedef int ieee80211_scan_iter_func(void *, const struct ieee80211_scan_entry *);
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int ieee80211_scan_iterate(struct ieee80211com *, ieee80211_scan_iter_func *, void *);
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+u32 ieee80211_scan_get_bias(struct ieee80211_channel *c);
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+void ieee80211_scan_set_bss_channel(struct ieee80211com *ic, struct ieee80211_channel *c);
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/*
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* Parameters supplied when adding/updating an entry in a
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--- a/net80211/ieee80211.c
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+++ b/net80211/ieee80211.c
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@@ -373,8 +373,16 @@ void
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ieee80211_ifdetach(struct ieee80211com *ic)
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{
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struct ieee80211vap *vap;
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+ unsigned long flags;
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int count;
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+ /* mark the channel as no longer in use */
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+ ic->ic_bsschan = IEEE80211_CHAN_ANYC;
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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+
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+
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/* bring down all vaps */
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TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
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ieee80211_stop(vap->iv_dev);
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--- a/net80211/ieee80211_input.c
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+++ b/net80211/ieee80211_input.c
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@@ -2775,6 +2775,7 @@ static void
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ieee80211_doth_switch_channel(struct ieee80211vap *vap)
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{
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struct ieee80211com *ic = vap->iv_ic;
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+ unsigned long flags;
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
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"%s: Channel switch to %3d (%4d MHz) NOW!\n",
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@@ -2797,6 +2798,9 @@ ieee80211_doth_switch_channel(struct iee
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ic->ic_curchan = ic->ic_bsschan = vap->iv_csa_chan;
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ic->ic_set_channel(ic);
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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}
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static void
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--- a/net80211/ieee80211_node.c
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+++ b/net80211/ieee80211_node.c
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@@ -308,6 +308,7 @@ ieee80211_create_ibss(struct ieee80211va
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{
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struct ieee80211com *ic = vap->iv_ic;
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struct ieee80211_node *ni;
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+ unsigned long flags;
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
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"%s: creating ibss on channel %u\n", __func__,
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@@ -386,6 +387,9 @@ ieee80211_create_ibss(struct ieee80211va
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ic->ic_bsschan = chan;
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ieee80211_node_set_chan(ic, ni);
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ic->ic_curmode = ieee80211_chan2mode(chan);
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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/* Update country ie information */
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ieee80211_build_countryie(ic);
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@@ -622,6 +626,7 @@ ieee80211_sta_join1(struct ieee80211_nod
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struct ieee80211vap *vap = selbs->ni_vap;
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struct ieee80211com *ic = selbs->ni_ic;
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struct ieee80211_node *obss;
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+ unsigned long flags;
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int canreassoc;
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if (vap->iv_opmode == IEEE80211_M_IBSS) {
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@@ -650,6 +655,9 @@ ieee80211_sta_join1(struct ieee80211_nod
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ic->ic_curchan = ic->ic_bsschan;
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ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
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ic->ic_set_channel(ic);
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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/*
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* Set the erp state (mostly the slot time) to deal with
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* the auto-select case; this should be redundant if the
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--- a/net80211/ieee80211_proto.c
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+++ b/net80211/ieee80211_proto.c
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@@ -1231,6 +1231,7 @@ ieee80211_dturbo_switch(struct ieee80211
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struct ieee80211vap *vap = TAILQ_FIRST(&ic->ic_vaps);
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#endif
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struct ieee80211_channel *chan;
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+ unsigned long flags;
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chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
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if (chan == NULL) { /* XXX should not happen */
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@@ -1249,6 +1250,9 @@ ieee80211_dturbo_switch(struct ieee80211
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ic->ic_bsschan = chan;
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ic->ic_curchan = chan;
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ic->ic_set_channel(ic);
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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/* NB: do not need to reset ERP state because in sta mode */
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}
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EXPORT_SYMBOL(ieee80211_dturbo_switch);
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--- a/net80211/ieee80211_wireless.c
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+++ b/net80211/ieee80211_wireless.c
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@@ -4076,8 +4076,13 @@ ieee80211_ioctl_setchanlist(struct net_d
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if (nchan == 0) /* no valid channels, disallow */
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return -EINVAL;
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if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && /* XXX */
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- isclr(chanlist, ic->ic_bsschan->ic_ieee))
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+ isclr(chanlist, ic->ic_bsschan->ic_ieee)) {
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+ unsigned long flags;
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ic->ic_bsschan = IEEE80211_CHAN_ANYC; /* invalidate */
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+ spin_lock_irqsave(&channel_lock, flags);
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+ ieee80211_scan_set_bss_channel(ic, ic->ic_bsschan);
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+ spin_unlock_irqrestore(&channel_lock, flags);
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+ }
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memcpy(ic->ic_chan_active, chanlist, sizeof(ic->ic_chan_active));
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/* update Supported Channels information element */
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--- a/net80211/ieee80211_scan_ap.c
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+++ b/net80211/ieee80211_scan_ap.c
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@@ -208,9 +208,15 @@ ap_start(struct ieee80211_scan_state *ss
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struct ieee80211com *ic = NULL;
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int i;
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unsigned int mode = 0;
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+ unsigned long sflags;
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SCAN_AP_LOCK_IRQ(as);
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ic = vap->iv_ic;
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+
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+ spin_lock_irqsave(&channel_lock, sflags);
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+ ieee80211_scan_set_bss_channel(ic, NULL);
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+ spin_unlock_irqrestore(&channel_lock, sflags);
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+
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/* Determine mode flags to match, or leave zero for auto mode */
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ss->ss_last = 0;
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ieee80211_scan_add_channels(ic, ss, vap->iv_des_mode);
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@@ -423,8 +429,10 @@ pc_cmp_idletime(struct ieee80211_channel
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if (!a->ic_idletime || !b->ic_idletime)
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return 0;
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- /* a is better than b (return < 0) when a has more idle time than b */
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- return b->ic_idletime - a->ic_idletime;
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+ /* a is better than b (return < 0) when a has more idle and less bias time than b */
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+ return
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+ ((100 - (u32) a->ic_idletime) + ieee80211_scan_get_bias(a)) -
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+ ((100 - (u32) b->ic_idletime) + ieee80211_scan_get_bias(b));
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}
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@@ -575,6 +583,7 @@ ap_end(struct ieee80211_scan_state *ss,
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struct ap_state *as = ss->ss_priv;
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struct ieee80211_channel *bestchan = NULL;
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struct ieee80211com *ic = NULL;
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+ unsigned long sflags;
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int res = 1;
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SCAN_AP_LOCK_IRQ(as);
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@@ -586,8 +595,11 @@ ap_end(struct ieee80211_scan_state *ss,
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/* record stats for the channel that was scanned last */
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ic->ic_set_channel(ic);
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+ spin_lock_irqsave(&channel_lock, sflags);
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+ ieee80211_scan_set_bss_channel(ic, NULL);
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bestchan = pick_channel(ss, vap, flags);
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if (bestchan == NULL) {
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+ spin_unlock_irqrestore(&channel_lock, sflags);
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if (ss->ss_last > 0) {
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/* no suitable channel, should not happen */
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printk(KERN_ERR "%s: %s: no suitable channel! "
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@@ -606,6 +618,7 @@ ap_end(struct ieee80211_scan_state *ss,
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bestchan->ic_freq, bestchan->ic_flags &
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~IEEE80211_CHAN_TURBO)) == NULL) {
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/* should never happen ?? */
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+ spin_unlock_irqrestore(&channel_lock, sflags);
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SCAN_AP_UNLOCK_IRQ_EARLY(as);
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return 0;
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}
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@@ -618,6 +631,9 @@ ap_end(struct ieee80211_scan_state *ss,
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as->as_action = action;
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as->as_selbss = se;
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+ ieee80211_scan_set_bss_channel(ic, bestchan);
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+ spin_unlock_irqrestore(&channel_lock, sflags);
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+
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/* Must defer action to avoid possible recursive call through
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* 80211 state machine, which would result in recursive
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* locking. */
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