168 lines
3.6 KiB
C
168 lines
3.6 KiB
C
/*
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* Host AP crypto routines
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*
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* Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See README and COPYING for
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* more details.
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*/
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struct hostap_crypto_alg {
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struct list_head list;
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struct hostap_crypto_ops *ops;
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};
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struct hostap_crypto {
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struct list_head algs;
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spinlock_t lock;
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};
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static struct hostap_crypto *hcrypt;
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int hostap_register_crypto_ops(struct hostap_crypto_ops *ops)
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{
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unsigned long flags;
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struct hostap_crypto_alg *alg;
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if (hcrypt == NULL)
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return -1;
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alg = (struct hostap_crypto_alg *) kmalloc(sizeof(*alg), GFP_KERNEL);
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if (alg == NULL)
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return -ENOMEM;
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memset(alg, 0, sizeof(*alg));
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alg->ops = ops;
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spin_lock_irqsave(&hcrypt->lock, flags);
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list_add(&alg->list, &hcrypt->algs);
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spin_unlock_irqrestore(&hcrypt->lock, flags);
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printk(KERN_DEBUG "hostap_crypt: registered algorithm '%s'\n",
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ops->name);
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return 0;
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}
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int hostap_unregister_crypto_ops(struct hostap_crypto_ops *ops)
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{
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unsigned long flags;
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struct list_head *ptr;
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struct hostap_crypto_alg *del_alg = NULL;
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if (hcrypt == NULL)
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return -1;
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spin_lock_irqsave(&hcrypt->lock, flags);
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for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
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struct hostap_crypto_alg *alg =
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(struct hostap_crypto_alg *) ptr;
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if (alg->ops == ops) {
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list_del(&alg->list);
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del_alg = alg;
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break;
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}
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}
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spin_unlock_irqrestore(&hcrypt->lock, flags);
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if (del_alg) {
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printk(KERN_DEBUG "hostap_crypt: unregistered algorithm "
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"'%s'\n", ops->name);
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kfree(del_alg);
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}
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return del_alg ? 0 : -1;
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}
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struct hostap_crypto_ops * hostap_get_crypto_ops(const char *name)
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{
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unsigned long flags;
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struct list_head *ptr;
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struct hostap_crypto_alg *found_alg = NULL;
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if (hcrypt == NULL)
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return NULL;
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spin_lock_irqsave(&hcrypt->lock, flags);
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for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
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struct hostap_crypto_alg *alg =
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(struct hostap_crypto_alg *) ptr;
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if (strcmp(alg->ops->name, name) == 0) {
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found_alg = alg;
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break;
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}
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}
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spin_unlock_irqrestore(&hcrypt->lock, flags);
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if (found_alg)
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return found_alg->ops;
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else
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return NULL;
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}
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static void * hostap_crypt_null_init(int keyidx) { return (void *) 1; }
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static void hostap_crypt_null_deinit(void *priv) {}
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static struct hostap_crypto_ops hostap_crypt_null = {
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.name = "NULL",
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.init = hostap_crypt_null_init,
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.deinit = hostap_crypt_null_deinit,
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.encrypt_mpdu = NULL,
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.decrypt_mpdu = NULL,
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.encrypt_msdu = NULL,
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.decrypt_msdu = NULL,
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.set_key = NULL,
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.get_key = NULL,
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.extra_prefix_len = 0,
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.extra_postfix_len = 0
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};
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static int __init hostap_crypto_init(void)
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{
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hcrypt = (struct hostap_crypto *) kmalloc(sizeof(*hcrypt), GFP_KERNEL);
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if (hcrypt == NULL)
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return -ENOMEM;
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memset(hcrypt, 0, sizeof(*hcrypt));
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INIT_LIST_HEAD(&hcrypt->algs);
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spin_lock_init(&hcrypt->lock);
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(void) hostap_register_crypto_ops(&hostap_crypt_null);
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return 0;
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}
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static void __exit hostap_crypto_deinit(void)
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{
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struct list_head *ptr, *n;
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if (hcrypt == NULL)
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return;
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for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
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ptr = n, n = ptr->next) {
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struct hostap_crypto_alg *alg =
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(struct hostap_crypto_alg *) ptr;
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list_del(ptr);
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printk(KERN_DEBUG "hostap_crypt: unregistered algorithm "
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"'%s' (deinit)\n", alg->ops->name);
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kfree(alg);
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}
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kfree(hcrypt);
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}
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EXPORT_SYMBOL(hostap_register_crypto_ops);
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EXPORT_SYMBOL(hostap_unregister_crypto_ops);
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EXPORT_SYMBOL(hostap_get_crypto_ops);
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