[MAC80211]: Add mac80211 wireless stack.

Add mac80211, the IEEE 802.11 software MAC layer.

Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 386 insertions, 0 deletions

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
new file mode 100644
index 000000000000..cddaf578dc8f
--- /dev/null
+++ b/net/mac80211/sta_info.c
@@ -0,0 +1,386 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "ieee80211_rate.h"
+#include "sta_info.h"
+
+/* Caller must hold local->sta_lock */
+static void sta_info_hash_add(struct ieee80211_local *local,
+                              struct sta_info *sta)
+{
+        sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
+        local->sta_hash[STA_HASH(sta->addr)] = sta;
+}
+
+
+/* Caller must hold local->sta_lock */
+static void sta_info_hash_del(struct ieee80211_local *local,
+                              struct sta_info *sta)
+{
+        struct sta_info *s;
+
+        s = local->sta_hash[STA_HASH(sta->addr)];
+        if (!s)
+                return;
+        if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
+                local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
+                return;
+        }
+
+        while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
+                s = s->hnext;
+        if (s->hnext)
+                s->hnext = s->hnext->hnext;
+        else
+                printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
+                       "hash table\n", local->mdev->name, MAC_ARG(sta->addr));
+}
+
+static inline void __sta_info_get(struct sta_info *sta)
+{
+        kref_get(&sta->kref);
+}
+
+struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
+{
+        struct sta_info *sta;
+
+        spin_lock_bh(&local->sta_lock);
+        sta = local->sta_hash[STA_HASH(addr)];
+        while (sta) {
+                if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
+                        __sta_info_get(sta);
+                        break;
+                }
+                sta = sta->hnext;
+        }
+        spin_unlock_bh(&local->sta_lock);
+
+        return sta;
+}
+EXPORT_SYMBOL(sta_info_get);
+
+int sta_info_min_txrate_get(struct ieee80211_local *local)
+{
+        struct sta_info *sta;
+        struct ieee80211_hw_mode *mode;
+        int min_txrate = 9999999;
+        int i;
+
+        spin_lock_bh(&local->sta_lock);
+        mode = local->oper_hw_mode;
+        for (i = 0; i < STA_HASH_SIZE; i++) {
+                sta = local->sta_hash[i];
+                while (sta) {
+                        if (sta->txrate < min_txrate)
+                                min_txrate = sta->txrate;
+                        sta = sta->hnext;
+                }
+        }
+        spin_unlock_bh(&local->sta_lock);
+        if (min_txrate == 9999999)
+                min_txrate = 0;
+
+        return mode->rates[min_txrate].rate;
+}
+
+
+static void sta_info_release(struct kref *kref)
+{
+        struct sta_info *sta = container_of(kref, struct sta_info, kref);
+        struct ieee80211_local *local = sta->local;
+        struct sk_buff *skb;
+
+        /* free sta structure; it has already been removed from
+         * hash table etc. external structures. Make sure that all
+         * buffered frames are release (one might have been added
+         * after sta_info_free() was called). */
+        while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
+                local->total_ps_buffered--;
+                dev_kfree_skb_any(skb);
+        }
+        while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
+                dev_kfree_skb_any(skb);
+        }
+        rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
+        rate_control_put(sta->rate_ctrl);
+        kfree(sta);
+}
+
+
+void sta_info_put(struct sta_info *sta)
+{
+        kref_put(&sta->kref, sta_info_release);
+}
+EXPORT_SYMBOL(sta_info_put);
+
+
+struct sta_info * sta_info_add(struct ieee80211_local *local,
+                               struct net_device *dev, u8 *addr, gfp_t gfp)
+{
+        struct sta_info *sta;
+
+        sta = kzalloc(sizeof(*sta), gfp);
+        if (!sta)
+                return NULL;
+
+        kref_init(&sta->kref);
+
+        sta->rate_ctrl = rate_control_get(local->rate_ctrl);
+        sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
+        if (!sta->rate_ctrl_priv) {
+                rate_control_put(sta->rate_ctrl);
+                kref_put(&sta->kref, sta_info_release);
+                kfree(sta);
+                return NULL;
+        }
+
+        memcpy(sta->addr, addr, ETH_ALEN);
+        sta->local = local;
+        sta->dev = dev;
+        skb_queue_head_init(&sta->ps_tx_buf);
+        skb_queue_head_init(&sta->tx_filtered);
+        __sta_info_get(sta);    /* sta used by caller, decremented by
+                                 * sta_info_put() */
+        spin_lock_bh(&local->sta_lock);
+        list_add(&sta->list, &local->sta_list);
+        local->num_sta++;
+        sta_info_hash_add(local, sta);
+        spin_unlock_bh(&local->sta_lock);
+        if (local->ops->sta_table_notification)
+                local->ops->sta_table_notification(local_to_hw(local),
+                                                  local->num_sta);
+        sta->key_idx_compression = HW_KEY_IDX_INVALID;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+        printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
+               local->mdev->name, MAC_ARG(addr));
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+
+        return sta;
+}
+
+static void sta_info_remove(struct sta_info *sta)
+{
+        struct ieee80211_local *local = sta->local;
+        struct ieee80211_sub_if_data *sdata;
+
+        sta_info_hash_del(local, sta);
+        list_del(&sta->list);
+        sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+        if (sta->flags & WLAN_STA_PS) {
+                sta->flags &= ~WLAN_STA_PS;
+                if (sdata->bss)
+                        atomic_dec(&sdata->bss->num_sta_ps);
+        }
+        local->num_sta--;
+        sta_info_remove_aid_ptr(sta);
+}
+
+void sta_info_free(struct sta_info *sta, int locked)
+{
+        struct sk_buff *skb;
+        struct ieee80211_local *local = sta->local;
+
+        if (!locked) {
+                spin_lock_bh(&local->sta_lock);
+                sta_info_remove(sta);
+                spin_unlock_bh(&local->sta_lock);
+        } else {
+                sta_info_remove(sta);
+        }
+        if (local->ops->sta_table_notification)
+                local->ops->sta_table_notification(local_to_hw(local),
+                                                  local->num_sta);
+
+        while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
+                local->total_ps_buffered--;
+                dev_kfree_skb_any(skb);
+        }
+        while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
+                dev_kfree_skb_any(skb);
+        }
+
+        if (sta->key) {
+                if (local->ops->set_key) {
+                        struct ieee80211_key_conf *key;
+                        key = ieee80211_key_data2conf(local, sta->key);
+                        if (key) {
+                                local->ops->set_key(local_to_hw(local),
+                                                   DISABLE_KEY,
+                                                   sta->addr, key, sta->aid);
+                                kfree(key);
+                        }
+                }
+        } else if (sta->key_idx_compression != HW_KEY_IDX_INVALID) {
+                struct ieee80211_key_conf conf;
+                memset(&conf, 0, sizeof(conf));
+                conf.hw_key_idx = sta->key_idx_compression;
+                conf.alg = ALG_NULL;
+                conf.flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
+                local->ops->set_key(local_to_hw(local), DISABLE_KEY,
+                                   sta->addr, &conf, sta->aid);
+                sta->key_idx_compression = HW_KEY_IDX_INVALID;
+        }
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+        printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
+               local->mdev->name, MAC_ARG(sta->addr));
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+
+        if (sta->key) {
+                ieee80211_key_free(sta->key);
+                sta->key = NULL;
+        }
+
+        sta_info_put(sta);
+}
+
+
+static inline int sta_info_buffer_expired(struct ieee80211_local *local,
+                                          struct sta_info *sta,
+                                          struct sk_buff *skb)
+{
+        struct ieee80211_tx_packet_data *pkt_data;
+        int timeout;
+
+        if (!skb)
+                return 0;
+
+        pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
+
+        /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
+        timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
+                   15625) * HZ;
+        if (timeout < STA_TX_BUFFER_EXPIRE)
+                timeout = STA_TX_BUFFER_EXPIRE;
+        return time_after(jiffies, pkt_data->jiffies + timeout);
+}
+
+
+static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
+                                             struct sta_info *sta)
+{
+        unsigned long flags;
+        struct sk_buff *skb;
+
+        if (skb_queue_empty(&sta->ps_tx_buf))
+                return;
+
+        for (;;) {
+                spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
+                skb = skb_peek(&sta->ps_tx_buf);
+                if (sta_info_buffer_expired(local, sta, skb)) {
+                        skb = __skb_dequeue(&sta->ps_tx_buf);
+                        if (skb_queue_empty(&sta->ps_tx_buf))
+                                sta->flags &= ~WLAN_STA_TIM;
+                } else
+                        skb = NULL;
+                spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
+
+                if (skb) {
+                        local->total_ps_buffered--;
+                        printk(KERN_DEBUG "Buffered frame expired (STA "
+                               MAC_FMT ")\n", MAC_ARG(sta->addr));
+                        dev_kfree_skb(skb);
+                } else
+                        break;
+        }
+}
+
+
+static void sta_info_cleanup(unsigned long data)
+{
+        struct ieee80211_local *local = (struct ieee80211_local *) data;
+        struct sta_info *sta;
+
+        spin_lock_bh(&local->sta_lock);
+        list_for_each_entry(sta, &local->sta_list, list) {
+                __sta_info_get(sta);
+                sta_info_cleanup_expire_buffered(local, sta);
+                sta_info_put(sta);
+        }
+        spin_unlock_bh(&local->sta_lock);
+
+        local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
+        add_timer(&local->sta_cleanup);
+}
+
+void sta_info_init(struct ieee80211_local *local)
+{
+        spin_lock_init(&local->sta_lock);
+        INIT_LIST_HEAD(&local->sta_list);
+        INIT_LIST_HEAD(&local->deleted_sta_list);
+
+        init_timer(&local->sta_cleanup);
+        local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
+        local->sta_cleanup.data = (unsigned long) local;
+        local->sta_cleanup.function = sta_info_cleanup;
+}
+
+int sta_info_start(struct ieee80211_local *local)
+{
+        add_timer(&local->sta_cleanup);
+        return 0;
+}
+
+void sta_info_stop(struct ieee80211_local *local)
+{
+        struct sta_info *sta, *tmp;
+
+        del_timer(&local->sta_cleanup);
+
+        list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
+                /*  We don't need locking at this point. */
+                sta_info_free(sta, 0);
+        }
+}
+
+void sta_info_remove_aid_ptr(struct sta_info *sta)
+{
+        struct ieee80211_sub_if_data *sdata;
+
+        if (sta->aid <= 0)
+                return;
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+
+        if (sdata->local->ops->set_tim)
+                sdata->local->ops->set_tim(local_to_hw(sdata->local),
+                                          sta->aid, 0);
+        if (sdata->bss)
+                __bss_tim_clear(sdata->bss, sta->aid);
+}
+
+
+/**
+ * sta_info_flush - flush matching STA entries from the STA table
+ * @local: local interface data
+ * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
+ */
+void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
+{
+        struct sta_info *sta, *tmp;
+
+        spin_lock_bh(&local->sta_lock);
+        list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
+                if (!dev || dev == sta->dev)
+                        sta_info_free(sta, 1);
+        spin_unlock_bh(&local->sta_lock);
+}