ieee80211_crypt.h

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/*
 * Original code based on Host AP (software wireless LAN access point) driver
 * for Intersil Prism2/2.5/3.
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <[email protected]>
 * Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
 *
 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
 * <[email protected]>
 *
 * Copyright (c) 2004, Intel Corporation
 *
 * 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. See README and COPYING for
 * more details.
 */

/*
 * This file defines the interface to the ieee80211 crypto module.
 */
#ifndef IEEE80211_CRYPT_H
#define IEEE80211_CRYPT_H

#include <linux/skbuff.h>

struct ieee80211_crypto_ops {
    const char *name;

    /* init new crypto context (e.g., allocate private data space,
     * select IV, etc.); returns NULL on failure or pointer to allocated
     * private data on success */
    void * (*init)(int keyidx);

    /* deinitialize crypto context and free allocated private data */
    void (*deinit)(void *priv);

    /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
     * value from decrypt_mpdu is passed as the keyidx value for
     * decrypt_msdu. skb must have enough head and tail room for the
     * encryption; if not, error will be returned; these functions are
     * called for all MPDUs (i.e., fragments).
     */
    int (*encrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
    int (*decrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);

    /* These functions are called for full MSDUs, i.e. full frames.
     * These can be NULL if full MSDU operations are not needed. */
    int (*encrypt_msdu)(struct sk_buff *skb, int hdr_len, void *priv);
    int (*decrypt_msdu)(struct sk_buff *skb, int keyidx, int hdr_len,
                void *priv);

    int (*set_key)(void *key, int len, u8 *seq, void *priv);
    int (*get_key)(void *key, int len, u8 *seq, void *priv);

    /* procfs handler for printing out key information and possible
     * statistics */
    char * (*print_stats)(char *p, void *priv);

    /* maximum number of bytes added by encryption; encrypt buf is
     * allocated with extra_prefix_len bytes, copy of in_buf, and
     * extra_postfix_len; encrypt need not use all this space, but
     * the result must start at the beginning of the buffer and correct
     * length must be returned */
    int extra_prefix_len, extra_postfix_len;

    struct module *owner;
};

struct ieee80211_crypt_data {
    struct list_head list; /* delayed deletion list */
    struct ieee80211_crypto_ops *ops;
    void *priv;
    atomic_t refcnt;
};

int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
struct ieee80211_crypto_ops * ieee80211_get_crypto_ops(const char *name);
void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
void ieee80211_crypt_deinit_handler(unsigned long);
void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
                    struct ieee80211_crypt_data **crypt);

#endif