add devicescape 802.11 stack

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2791 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 417 insertions, 0 deletions

diff --git a/target/linux/package/ieee80211-dscape/src/sta_info.c b/target/linux/package/ieee80211-dscape/src/sta_info.c
new file mode 100644
index 0000000000..4bb9f74ba0
--- /dev/null
+++ b/target/linux/package/ieee80211-dscape/src/sta_info.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ *
+ * 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/config.h>
+#include <linux/version.h>
+#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/ieee80211.h>
+#include "ieee80211_i.h"
+#include "ieee80211_proc.h"
+#include "rate_control.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 == NULL)
+		return;
+	if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
+		local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
+		return;
+	}
+
+	while (s->hnext != NULL &&
+	       memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
+		s = s->hnext;
+	if (s->hnext != NULL)
+		s->hnext = s->hnext->hnext;
+	else
+		printk(KERN_ERR "%s: could not remove STA " MACSTR " from "
+		       "hash table\n", local->mdev->name, MAC2STR(sta->addr));
+}
+
+
+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) {
+			atomic_inc(&sta->users);
+			break;
+		}
+		sta = sta->hnext;
+	}
+	spin_unlock_bh(&local->sta_lock);
+
+	return sta;
+}
+
+
+int sta_info_min_txrate_get(struct ieee80211_local *local)
+{
+	struct sta_info *sta;
+        int min_txrate = 9999999;
+        int i;
+
+	spin_lock_bh(&local->sta_lock);
+	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 min_txrate;
+}
+
+
+void sta_info_release(struct ieee80211_local *local, struct sta_info *sta)
+{
+	struct sk_buff *skb;
+
+	if (!atomic_dec_and_test(&sta->users))
+		return;
+
+	/* 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(local, sta->rate_ctrl_priv);
+	kfree(sta);
+}
+
+
+struct sta_info * sta_info_add(struct ieee80211_local *local,
+			       struct net_device *dev, u8 *addr)
+{
+	struct sta_info *sta;
+
+	sta = kmalloc(sizeof(*sta), GFP_ATOMIC);
+	if (!sta)
+		return NULL;
+
+	memset(sta, 0, sizeof(*sta));
+
+	sta->rate_ctrl_priv = rate_control_alloc_sta(local);
+	if (sta->rate_ctrl_priv == NULL) {
+		kfree(sta);
+		return NULL;
+	}
+
+        memcpy(sta->addr, addr, ETH_ALEN);
+        sta->dev = dev;
+	skb_queue_head_init(&sta->ps_tx_buf);
+	skb_queue_head_init(&sta->tx_filtered);
+	atomic_inc(&sta->users); /* sta in hashlist etc, decremented by
+				  * sta_info_free() */
+	atomic_inc(&sta->users); /* sta used by caller, decremented by
+				  * sta_info_release() */
+	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->hw->sta_table_notification)
+		local->hw->sta_table_notification(local->mdev, local->num_sta);
+	sta->key_idx_compression = HW_KEY_IDX_INVALID;
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "%s: Added STA " MACSTR "\n",
+	       dev->name, MAC2STR(addr));
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+
+	if (!in_interrupt()) {
+		ieee80211_proc_init_sta(local, sta);
+	} else {
+		/* procfs entry adding might sleep, so schedule process context
+		 * task for adding proc entry for STAs that do not yet have
+		 * one. */
+		schedule_work(&local->sta_proc_add);
+	}
+
+	return sta;
+}
+
+
+void sta_info_free(struct ieee80211_local *local, struct sta_info *sta,
+		   int locked)
+{
+	struct sk_buff *skb;
+	struct ieee80211_sub_if_data *sdata;
+
+	if (!locked)
+		spin_lock_bh(&local->sta_lock);
+	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);
+	if (!locked)
+		spin_unlock_bh(&local->sta_lock);
+	if (local->hw->sta_table_notification)
+		local->hw->sta_table_notification(local->mdev, 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->hw->set_key) {
+			struct ieee80211_key_conf *key;
+			key = ieee80211_key_data2conf(local, sta->key);
+			if (key) {
+				local->hw->set_key(local->mdev, DISABLE_KEY,
+						   sta->addr, key, sta->aid);
+				kfree(key);
+			}
+		}
+		kfree(sta->key);
+		sta->key = NULL;
+	} 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.force_sw_encrypt = 1;
+		local->hw->set_key(local->mdev, DISABLE_KEY, sta->addr, &conf,
+				   sta->aid);
+		sta->key_idx_compression = HW_KEY_IDX_INVALID;
+	}
+
+#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "%s: Removed STA " MACSTR "\n",
+	       local->mdev->name, MAC2STR(sta->addr));
+#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
+
+	ieee80211_proc_deinit_sta(local, sta);
+
+	if (atomic_read(&sta->users) != 1) {
+		/* This is OK, but printed for debugging. The station structure
+		 * will be removed when the other user of the data calls
+		 * sta_info_release(). */
+		printk(KERN_DEBUG "%s: STA " MACSTR " users count %d when "
+		       "removing it\n", local->mdev->name, MAC2STR(sta->addr),
+		       atomic_read(&sta->users));
+	}
+
+	sta_info_release(local, sta);
+}
+
+
+static inline int sta_info_buffer_expired(struct sk_buff *skb)
+{
+        struct ieee80211_tx_packet_data *pkt_data;
+	if (!skb)
+		return 0;
+
+	/* TODO: this could be improved by passing STA listen interval into
+	 * the kernel driver and expiring frames after 2 x listen_interval x
+         * beacon interval */
+
+        pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
+
+        if (pkt_data->magic != IEEE80211_CB_MAGIC)
+                return 1;
+
+	return time_after(jiffies, pkt_data->jiffies + STA_TX_BUFFER_EXPIRE);
+}
+
+
+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(skb))
+			skb = __skb_dequeue(&sta->ps_tx_buf);
+		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 "
+			       MACSTR ")\n", MAC2STR(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 list_head *ptr;
+
+	spin_lock_bh(&local->sta_lock);
+	ptr = local->sta_list.next;
+	while (ptr && ptr != &local->sta_list) {
+		struct sta_info *sta = (struct sta_info *) ptr;
+		atomic_inc(&sta->users);
+		sta_info_cleanup_expire_buffered(local, sta);
+		sta_info_release(local, sta);
+		ptr = ptr->next;
+	}
+	spin_unlock_bh(&local->sta_lock);
+
+	local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
+	add_timer(&local->sta_cleanup);
+}
+
+
+static void sta_info_proc_add_task(void *data)
+{
+	struct ieee80211_local *local = data;
+	struct list_head *ptr;
+	struct sta_info *sta;
+	int max_adds = 100;
+
+	while (max_adds > 0) {
+		sta = NULL;
+		spin_lock_bh(&local->sta_lock);
+		list_for_each(ptr, &local->sta_list) {
+			sta = list_entry(ptr, struct sta_info, list);
+			if (!sta->proc_entry_added) {
+				atomic_inc(&sta->users);
+				break;
+			}
+			sta = NULL;
+		}
+		spin_unlock_bh(&local->sta_lock);
+
+		if (!sta)
+			break;
+
+		ieee80211_proc_init_sta(local, sta);
+		atomic_dec(&sta->users);
+
+		max_adds--;
+	}
+}
+
+
+void sta_info_init(struct ieee80211_local *local)
+{
+	spin_lock_init(&local->sta_lock);
+	INIT_LIST_HEAD(&local->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;
+
+	INIT_WORK(&local->sta_proc_add, sta_info_proc_add_task, local);
+}
+
+void sta_info_start(struct ieee80211_local *local)
+{
+	add_timer(&local->sta_cleanup);
+}
+
+void sta_info_stop(struct ieee80211_local *local)
+{
+	struct list_head *ptr;
+
+	del_timer(&local->sta_cleanup);
+
+	ptr = local->sta_list.next;
+	while (ptr && ptr != &local->sta_list) {
+		struct sta_info *sta = (struct sta_info *) ptr;
+		ptr = ptr->next;
+		sta_info_free(local, sta, 0);
+	}
+}
+
+
+void sta_info_remove_aid_ptr(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+	if (sta->aid <= 0 || !sdata->bss)
+		return;
+
+	sdata->bss->sta_aid[sta->aid - 1] = NULL;
+	if (sta->aid == sdata->bss->max_aid) {
+		while (sdata->bss->max_aid > 0 &&
+		       sdata->bss->sta_aid[sdata->bss->max_aid - 1] == NULL)
+			sdata->bss->max_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 list_head *ptr, *n;
+
+	spin_lock_bh(&local->sta_lock);
+
+	list_for_each_safe(ptr, n, &local->sta_list) {
+		struct sta_info *sta = list_entry(ptr, struct sta_info, list);
+		if (dev == NULL || dev == sta->dev)
+			sta_info_free(local, sta, 1);
+	}
+	spin_unlock_bh(&local->sta_lock);
+}