drivers/staging/rtl8192u/ieee80211/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          */
  35         void * (*init)(int keyidx);
  36
  37         /* deinitialize crypto context and free allocated private data */
  38         void (*deinit)(void *priv);
  39
  40         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  41          * value from decrypt_mpdu is passed as the keyidx value for
  42          * decrypt_msdu. skb must have enough head and tail room for the
  43          * encryption; if not, error will be returned; these functions are
  44          * called for all MPDUs (i.e., fragments).
  45          */
  46         int (*encrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
  47         int (*decrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
  48
  49         /* These functions are called for full MSDUs, i.e. full frames.
  50          * These can be NULL if full MSDU operations are not needed.
  51          */
  52         int (*encrypt_msdu)(struct sk_buff *skb, int hdr_len, void *priv);
  53         int (*decrypt_msdu)(struct sk_buff *skb, int keyidx, int hdr_len,
  54                             void *priv);
  55
  56         int (*set_key)(void *key, int len, u8 *seq, void *priv);
  57         int (*get_key)(void *key, int len, u8 *seq, void *priv);
  58
  59         /* procfs handler for printing out key information and possible
  60          * statistics
  61          */
  62         char * (*print_stats)(char *p, void *priv);
  63
  64         /* maximum number of bytes added by encryption; encrypt buf is
  65          * allocated with extra_prefix_len bytes, copy of in_buf, and
  66          * extra_postfix_len; encrypt need not use all this space, but
  67          * the result must start at the beginning of the buffer and correct
  68          * length must be returned
  69          */
  70         int extra_prefix_len, extra_postfix_len;
  71
  72         struct module *owner;
  73 };
  74
  75 struct ieee80211_crypt_data {
  76         struct list_head list; /* delayed deletion list */
  77         struct ieee80211_crypto_ops *ops;
  78         void *priv;
  79         atomic_t refcnt;
  80 };
  81
  82 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
  83 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
  84 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
  85 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force);
  86 void ieee80211_crypt_deinit_handler(unsigned long data);
  87 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  88                                     struct ieee80211_crypt_data **crypt);
  89
  90 #endif