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/types.h>
  27 #include <linux/list.h>
  28 #include <net/ieee80211.h>
  29 #include <asm/atomic.h>
  30
  31 enum {
  32         IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  33 };
  34
  35 struct sk_buff;
  36 struct module;
  37
  38 struct 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, void *priv);
  51
  52         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  53          * value from decrypt_mpdu is passed as the keyidx value for
  54          * decrypt_msdu. skb must have enough head and tail room for the
  55          * encryption; if not, error will be returned; these functions are
  56          * called for all MPDUs (i.e., fragments).
  57          */
  58         int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  59         int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  60
  61         /* These functions are called for full MSDUs, i.e. full frames.
  62          * These can be NULL if full MSDU operations are not needed. */
  63         int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  64         int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  65                              void *priv);
  66
  67         int (*set_key) (void *key, int len, u8 * seq, void *priv);
  68         int (*get_key) (void *key, int len, u8 * seq, void *priv);
  69
  70         /* procfs handler for printing out key information and possible
  71          * statistics */
  72         char *(*print_stats) (char *p, void *priv);
  73
  74         /* Crypto specific flag get/set for configuration settings */
  75         unsigned long (*get_flags) (void *priv);
  76         unsigned long (*set_flags) (unsigned long flags, void *priv);
  77
  78         /* maximum number of bytes added by encryption; encrypt buf is
  79          * allocated with extra_prefix_len bytes, copy of in_buf, and
  80          * extra_postfix_len; encrypt need not use all this space, but
  81          * the result must start at the beginning of the buffer and correct
  82          * length must be returned */
  83         int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  84         int extra_msdu_prefix_len, extra_msdu_postfix_len;
  85
  86         struct module *owner;
  87 };
  88
  89 struct ieee80211_crypt_data {
  90         struct list_head list;  /* delayed deletion list */
  91         struct ieee80211_crypto_ops *ops;
  92         void *priv;
  93         atomic_t refcnt;
  94 };
  95
  96 struct ieee80211_device;
  97
  98 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
  99 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
 100 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
 101 void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
 102 void ieee80211_crypt_deinit_handler(unsigned long);
 103 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
 104                                     struct ieee80211_crypt_data **crypt);
 105 void ieee80211_crypt_quiescing(struct ieee80211_device *ieee);
 106
 107 #endif