1 files changed, 284 insertions, 0 deletions

diff --git a/net/wireless/lib80211.c b/net/wireless/lib80211.c
new file mode 100644
index 000000000000..97d411f74507
--- /dev/null
+++ b/net/wireless/lib80211.c
@@ -0,0 +1,284 @@
+/*
+ * lib80211 -- common bits for IEEE802.11 drivers
+ *
+ * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
+ *
+ * Portions copied from old ieee80211 component, w/ original copyright
+ * notices below:
+ *
+ * Host AP crypto routines
+ *
+ * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
+ * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/ieee80211.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <net/lib80211.h>
+
+#define DRV_NAME        "lib80211"
+
+#define DRV_DESCRIPTION "common routines for IEEE802.11 drivers"
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
+MODULE_LICENSE("GPL");
+
+struct lib80211_crypto_alg {
+        struct list_head list;
+        struct lib80211_crypto_ops *ops;
+};
+
+static LIST_HEAD(lib80211_crypto_algs);
+static DEFINE_SPINLOCK(lib80211_crypto_lock);
+
+const char *print_ssid(char *buf, const char *ssid, u8 ssid_len)
+{
+        const char *s = ssid;
+        char *d = buf;
+
+        ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN);
+        while (ssid_len--) {
+                if (isprint(*s)) {
+                        *d++ = *s++;
+                        continue;
+                }
+
+                *d++ = '\\';
+                if (*s == '\0')
+                        *d++ = '0';
+                else if (*s == '\n')
+                        *d++ = 'n';
+                else if (*s == '\r')
+                        *d++ = 'r';
+                else if (*s == '\t')
+                        *d++ = 't';
+                else if (*s == '\\')
+                        *d++ = '\\';
+                else
+                        d += snprintf(d, 3, "%03o", *s);
+                s++;
+        }
+        *d = '\0';
+        return buf;
+}
+EXPORT_SYMBOL(print_ssid);
+
+int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
+                                spinlock_t *lock)
+{
+        memset(info, 0, sizeof(*info));
+
+        info->name = name;
+        info->lock = lock;
+
+        INIT_LIST_HEAD(&info->crypt_deinit_list);
+        setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
+                        (unsigned long)info);
+
+        return 0;
+}
+EXPORT_SYMBOL(lib80211_crypt_info_init);
+
+void lib80211_crypt_info_free(struct lib80211_crypt_info *info)
+{
+        int i;
+
+        lib80211_crypt_quiescing(info);
+        del_timer_sync(&info->crypt_deinit_timer);
+        lib80211_crypt_deinit_entries(info, 1);
+
+        for (i = 0; i < NUM_WEP_KEYS; i++) {
+                struct lib80211_crypt_data *crypt = info->crypt[i];
+                if (crypt) {
+                        if (crypt->ops) {
+                                crypt->ops->deinit(crypt->priv);
+                                module_put(crypt->ops->owner);
+                        }
+                        kfree(crypt);
+                        info->crypt[i] = NULL;
+                }
+        }
+}
+EXPORT_SYMBOL(lib80211_crypt_info_free);
+
+void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force)
+{
+        struct lib80211_crypt_data *entry, *next;
+        unsigned long flags;
+
+        spin_lock_irqsave(info->lock, flags);
+        list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) {
+                if (atomic_read(&entry->refcnt) != 0 && !force)
+                        continue;
+
+                list_del(&entry->list);
+
+                if (entry->ops) {
+                        entry->ops->deinit(entry->priv);
+                        module_put(entry->ops->owner);
+                }
+                kfree(entry);
+        }
+        spin_unlock_irqrestore(info->lock, flags);
+}
+EXPORT_SYMBOL(lib80211_crypt_deinit_entries);
+
+/* After this, crypt_deinit_list won't accept new members */
+void lib80211_crypt_quiescing(struct lib80211_crypt_info *info)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(info->lock, flags);
+        info->crypt_quiesced = 1;
+        spin_unlock_irqrestore(info->lock, flags);
+}
+EXPORT_SYMBOL(lib80211_crypt_quiescing);
+
+void lib80211_crypt_deinit_handler(unsigned long data)
+{
+        struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data;
+        unsigned long flags;
+
+        lib80211_crypt_deinit_entries(info, 0);
+
+        spin_lock_irqsave(info->lock, flags);
+        if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) {
+                printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
+                       "deletion list\n", info->name);
+                info->crypt_deinit_timer.expires = jiffies + HZ;
+                add_timer(&info->crypt_deinit_timer);
+        }
+        spin_unlock_irqrestore(info->lock, flags);
+}
+EXPORT_SYMBOL(lib80211_crypt_deinit_handler);
+
+void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
+                                    struct lib80211_crypt_data **crypt)
+{
+        struct lib80211_crypt_data *tmp;
+        unsigned long flags;
+
+        if (*crypt == NULL)
+                return;
+
+        tmp = *crypt;
+        *crypt = NULL;
+
+        /* must not run ops->deinit() while there may be pending encrypt or
+         * decrypt operations. Use a list of delayed deinits to avoid needing
+         * locking. */
+
+        spin_lock_irqsave(info->lock, flags);
+        if (!info->crypt_quiesced) {
+                list_add(&tmp->list, &info->crypt_deinit_list);
+                if (!timer_pending(&info->crypt_deinit_timer)) {
+                        info->crypt_deinit_timer.expires = jiffies + HZ;
+                        add_timer(&info->crypt_deinit_timer);
+                }
+        }
+        spin_unlock_irqrestore(info->lock, flags);
+}
+EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);
+
+int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops)
+{
+        unsigned long flags;
+        struct lib80211_crypto_alg *alg;
+
+        alg = kzalloc(sizeof(*alg), GFP_KERNEL);
+        if (alg == NULL)
+                return -ENOMEM;
+
+        alg->ops = ops;
+
+        spin_lock_irqsave(&lib80211_crypto_lock, flags);
+        list_add(&alg->list, &lib80211_crypto_algs);
+        spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
+
+        printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n",
+               ops->name);
+
+        return 0;
+}
+EXPORT_SYMBOL(lib80211_register_crypto_ops);
+
+int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
+{
+        struct lib80211_crypto_alg *alg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&lib80211_crypto_lock, flags);
+        list_for_each_entry(alg, &lib80211_crypto_algs, list) {
+                if (alg->ops == ops)
+                        goto found;
+        }
+        spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
+        return -EINVAL;
+
+      found:
+        printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm "
+               "'%s'\n", ops->name);
+        list_del(&alg->list);
+        spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
+        kfree(alg);
+        return 0;
+}
+EXPORT_SYMBOL(lib80211_unregister_crypto_ops);
+
+struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name)
+{
+        struct lib80211_crypto_alg *alg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&lib80211_crypto_lock, flags);
+        list_for_each_entry(alg, &lib80211_crypto_algs, list) {
+                if (strcmp(alg->ops->name, name) == 0)
+                        goto found;
+        }
+        spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
+        return NULL;
+
+      found:
+        spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
+        return alg->ops;
+}
+EXPORT_SYMBOL(lib80211_get_crypto_ops);
+
+static void *lib80211_crypt_null_init(int keyidx)
+{
+        return (void *)1;
+}
+
+static void lib80211_crypt_null_deinit(void *priv)
+{
+}
+
+static struct lib80211_crypto_ops lib80211_crypt_null = {
+        .name = "NULL",
+        .init = lib80211_crypt_null_init,
+        .deinit = lib80211_crypt_null_deinit,
+        .owner = THIS_MODULE,
+};
+
+static int __init lib80211_init(void)
+{
+        printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n");
+        return lib80211_register_crypto_ops(&lib80211_crypt_null);
+}
+
+static void __exit lib80211_exit(void)
+{
+        lib80211_unregister_crypto_ops(&lib80211_crypt_null);
+        BUG_ON(!list_empty(&lib80211_crypto_algs));
+}
+
+module_init(lib80211_init);
+module_exit(lib80211_exit);