LXR linux/include/net/ieee80211

   1/*
   2 * Original code based on Host AP (software wireless LAN access point) driver
   3 * for Intersil Prism2/2.5/3.
   4 *
   5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   6 * <j@w1.fi>
   7 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
   8 *
   9 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
  10 * <jketreno@linux.intel.com>
  11 *
  12 * Copyright (c) 2004, Intel Corporation
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2 as
  16 * published by the Free Software Foundation. See README and COPYING for
  17 * more details.
  18 */
  19
  20/*
  21 * This file defines the interface to the ieee80211 crypto module.
  22 */
  23#ifndef IEEE80211_CRYPT_H
  24#define IEEE80211_CRYPT_H
  25
  26#include <linux/types.h>
  27#include <linux/list.h>
  28#include <net/ieee80211.h>
  29#include <asm/atomic.h>
  30
  31enum {
  32        IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  33};
  34
  35struct sk_buff;
  36struct module;
  37
  38struct ieee80211_crypto_ops {
  39        const char *name;
  40        struct list_head list;
  41
  42        /* init new crypto context (e.g., allocate private data space,
  43         * select IV, etc.); returns NULL on failure or pointer to allocated
  44         * private data on success */
  45        void *(*init) (int keyidx);
  46
  47        /* deinitialize crypto context and free allocated private data */
  48        void (*deinit) (void *priv);
  49
  50        int (*build_iv) (struct sk_buff * skb, int hdr_len,
  51                         u8 *key, int keylen, void *priv);
  52
  53        /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  54         * value from decrypt_mpdu is passed as the keyidx value for
  55         * decrypt_msdu. skb must have enough head and tail room for the
  56         * encryption; if not, error will be returned; these functions are
  57         * called for all MPDUs (i.e., fragments).
  58         */
  59        int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  60        int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  61
  62        /* These functions are called for full MSDUs, i.e. full frames.
  63         * These can be NULL if full MSDU operations are not needed. */
  64        int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  65        int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  66                             void *priv);
  67
  68        int (*set_key) (void *key, int len, u8 * seq, void *priv);
  69        int (*get_key) (void *key, int len, u8 * seq, void *priv);
  70
  71        /* procfs handler for printing out key information and possible
  72         * statistics */
  73        char *(*print_stats) (char *p, void *priv);
  74
  75        /* Crypto specific flag get/set for configuration settings */
  76        unsigned long (*get_flags) (void *priv);
  77        unsigned long (*set_flags) (unsigned long flags, void *priv);
  78
  79        /* maximum number of bytes added by encryption; encrypt buf is
  80         * allocated with extra_prefix_len bytes, copy of in_buf, and
  81         * extra_postfix_len; encrypt need not use all this space, but
  82         * the result must start at the beginning of the buffer and correct
  83         * length must be returned */
  84        int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  85        int extra_msdu_prefix_len, extra_msdu_postfix_len;
  86
  87        struct module *owner;
  88};
  89
  90struct ieee80211_crypt_data {
  91        struct list_head list;  /* delayed deletion list */
  92        struct ieee80211_crypto_ops *ops;
  93        void *priv;
  94        atomic_t refcnt;
  95};
  96
  97struct ieee80211_device;
  98
  99int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
 100int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
 101struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
 102void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
 103void ieee80211_crypt_deinit_handler(unsigned long);
 104void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
 105                                    struct ieee80211_crypt_data **crypt);
 106void ieee80211_crypt_quiescing(struct ieee80211_device *ieee);
 107
 108#endif
 109