drivers/staging/rtl8192u/ieee80211_crypt.h

   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  * <jkmaline@cc.hut.fi>
   7  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.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/skbuff.h>
  27
  28 struct ieee80211_crypto_ops {
  29         const char *name;
  30
  31         /* init new crypto context (e.g., allocate private data space,
  32          * select IV, etc.); returns NULL on failure or pointer to allocated
  33          * private data on success */
  34         void * (*init)(int keyidx);
  35
  36         /* deinitialize crypto context and free allocated private data */
  37         void (*deinit)(void *priv);
  38
  39         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  40          * value from decrypt_mpdu is passed as the keyidx value for
  41          * decrypt_msdu. skb must have enough head and tail room for the
  42          * encryption; if not, error will be returned; these functions are
  43          * called for all MPDUs (i.e., fragments).
  44          */
  45         int (*encrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
  46         int (*decrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
  47
  48         /* These functions are called for full MSDUs, i.e. full frames.
  49          * These can be NULL if full MSDU operations are not needed. */
  50         int (*encrypt_msdu)(struct sk_buff *skb, int hdr_len, void *priv);
  51         int (*decrypt_msdu)(struct sk_buff *skb, int keyidx, int hdr_len,
  52                             void *priv);
  53
  54         int (*set_key)(void *key, int len, u8 *seq, void *priv);
  55         int (*get_key)(void *key, int len, u8 *seq, void *priv);
  56
  57         /* procfs handler for printing out key information and possible
  58          * statistics */
  59         char * (*print_stats)(char *p, void *priv);
  60
  61         /* maximum number of bytes added by encryption; encrypt buf is
  62          * allocated with extra_prefix_len bytes, copy of in_buf, and
  63          * extra_postfix_len; encrypt need not use all this space, but
  64          * the result must start at the beginning of the buffer and correct
  65          * length must be returned */
  66         int extra_prefix_len, extra_postfix_len;
  67
  68         struct module *owner;
  69 };
  70
  71 struct ieee80211_crypt_data {
  72         struct list_head list; /* delayed deletion list */
  73         struct ieee80211_crypto_ops *ops;
  74         void *priv;
  75         atomic_t refcnt;
  76 };
  77
  78 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
  79 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
  80 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
  81 void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
  82 void ieee80211_crypt_deinit_handler(unsigned long);
  83 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  84                                     struct ieee80211_crypt_data **crypt);
  85
  86 #endif