include/net/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 enum {
  29         IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1<<0),
  30 };
  31
  32 struct ieee80211_crypto_ops {
  33         const char *name;
  34
  35         /* init new crypto context (e.g., allocate private data space,
  36          * select IV, etc.); returns NULL on failure or pointer to allocated
  37          * private data on success */
  38         void *(*init) (int keyidx);
  39
  40         /* deinitialize crypto context and free allocated private data */
  41         void (*deinit) (void *priv);
  42
  43         int (*build_iv) (struct sk_buff * skb, int hdr_len, void *priv);
  44
  45         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  46          * value from decrypt_mpdu is passed as the keyidx value for
  47          * decrypt_msdu. skb must have enough head and tail room for the
  48          * encryption; if not, error will be returned; these functions are
  49          * called for all MPDUs (i.e., fragments).
  50          */
  51         int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  52         int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  53
  54         /* These functions are called for full MSDUs, i.e. full frames.
  55          * These can be NULL if full MSDU operations are not needed. */
  56         int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  57         int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  58                              void *priv);
  59
  60         int (*set_key) (void *key, int len, u8 * seq, void *priv);
  61         int (*get_key) (void *key, int len, u8 * seq, void *priv);
  62
  63         /* procfs handler for printing out key information and possible
  64          * statistics */
  65         char *(*print_stats) (char *p, void *priv);
  66
  67         /* Crypto specific flag get/set for configuration settings */
  68         unsigned long (*get_flags)(void *priv);
  69         unsigned long (*set_flags)(unsigned long flags, void *priv);
  70
  71         /* maximum number of bytes added by encryption; encrypt buf is
  72          * allocated with extra_prefix_len bytes, copy of in_buf, and
  73          * extra_postfix_len; encrypt need not use all this space, but
  74          * the result must start at the beginning of the buffer and correct
  75          * length must be returned */
  76         int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  77         int extra_msdu_prefix_len, extra_msdu_postfix_len;
  78
  79         struct module *owner;
  80 };
  81
  82 struct ieee80211_crypt_data {
  83         struct list_head list;  /* delayed deletion list */
  84         struct ieee80211_crypto_ops *ops;
  85         void *priv;
  86         atomic_t refcnt;
  87 };
  88
  89 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
  90 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
  91 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
  92 void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
  93 void ieee80211_crypt_deinit_handler(unsigned long);
  94 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
  95                                     struct ieee80211_crypt_data **crypt);
  96 void ieee80211_crypt_quiescing(struct ieee80211_device *ieee);
  97
  98 #endif