root/include/net/ieee80211_crypt.h

INCLUDED FROM

/*
 * 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
 * <j@w1.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
 *
 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
 * <jketreno@linux.intel.com>
 *
 * 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/types.h>
#include <linux/list.h>
#include <net/ieee80211.h>
#include <asm/atomic.h>

enum {
        IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
};

struct sk_buff;
struct module;

struct ieee80211_crypto_ops {
        const char *name;
        struct list_head list;

        /* 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);

        int (*build_iv) (struct sk_buff * skb, int hdr_len,
                         u8 *key, int keylen, 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);

        /* Crypto specific flag get/set for configuration settings */
        unsigned long (*get_flags) (void *priv);
        unsigned long (*set_flags) (unsigned long flags, 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_mpdu_prefix_len, extra_mpdu_postfix_len;
        int extra_msdu_prefix_len, extra_msdu_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;
};

struct ieee80211_device;

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);
void ieee80211_crypt_quiescing(struct ieee80211_device *ieee);

#endif