include/net/lib80211.h

   1 /*
   2  * lib80211.h -- common bits for IEEE802.11 wireless drivers
   3  *
   4  * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
   5  *
   6  * Some bits copied from old ieee80211 component, w/ original copyright
   7  * notices below:
   8  *
   9  * Original code based on Host AP (software wireless LAN access point) driver
  10  * for Intersil Prism2/2.5/3.
  11  *
  12  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
  13  * <j@w1.fi>
  14  * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
  15  *
  16  * Adaption to a generic IEEE 802.11 stack by James Ketrenos
  17  * <jketreno@linux.intel.com>
  18  *
  19  * Copyright (c) 2004, Intel Corporation
  20  *
  21  */
  22
  23 #ifndef LIB80211_H
  24 #define LIB80211_H
  25
  26 #include <linux/types.h>
  27 #include <linux/list.h>
  28 #include <linux/atomic.h>
  29 #include <linux/if.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/ieee80211.h>
  32 #include <linux/timer.h>
  33 #include <linux/seq_file.h>
  34
  35 #define NUM_WEP_KEYS    4
  36
  37 enum {
  38         IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  39 };
  40
  41 struct module;
  42
  43 struct lib80211_crypto_ops {
  44         const char *name;
  45         struct list_head list;
  46
  47         /* init new crypto context (e.g., allocate private data space,
  48          * select IV, etc.); returns NULL on failure or pointer to allocated
  49          * private data on success */
  50         void *(*init) (int keyidx);
  51
  52         /* deinitialize crypto context and free allocated private data */
  53         void (*deinit) (void *priv);
  54
  55         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  56          * value from decrypt_mpdu is passed as the keyidx value for
  57          * decrypt_msdu. skb must have enough head and tail room for the
  58          * encryption; if not, error will be returned; these functions are
  59          * called for all MPDUs (i.e., fragments).
  60          */
  61         int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  62         int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  63
  64         /* These functions are called for full MSDUs, i.e. full frames.
  65          * These can be NULL if full MSDU operations are not needed. */
  66         int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  67         int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  68                              void *priv);
  69
  70         int (*set_key) (void *key, int len, u8 * seq, void *priv);
  71         int (*get_key) (void *key, int len, u8 * seq, void *priv);
  72
  73         /* procfs handler for printing out key information and possible
  74          * statistics */
  75         void (*print_stats) (struct seq_file *m, void *priv);
  76
  77         /* Crypto specific flag get/set for configuration settings */
  78         unsigned long (*get_flags) (void *priv);
  79         unsigned long (*set_flags) (unsigned long flags, void *priv);
  80
  81         /* maximum number of bytes added by encryption; encrypt buf is
  82          * allocated with extra_prefix_len bytes, copy of in_buf, and
  83          * extra_postfix_len; encrypt need not use all this space, but
  84          * the result must start at the beginning of the buffer and correct
  85          * length must be returned */
  86         int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  87         int extra_msdu_prefix_len, extra_msdu_postfix_len;
  88
  89         struct module *owner;
  90 };
  91
  92 struct lib80211_crypt_data {
  93         struct list_head list;  /* delayed deletion list */
  94         struct lib80211_crypto_ops *ops;
  95         void *priv;
  96         atomic_t refcnt;
  97 };
  98
  99 struct lib80211_crypt_info {
 100         char *name;
 101         /* Most clients will already have a lock,
 102            so just point to that. */
 103         spinlock_t *lock;
 104
 105         struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
 106         int tx_keyidx;          /* default TX key index (crypt[tx_keyidx]) */
 107         struct list_head crypt_deinit_list;
 108         struct timer_list crypt_deinit_timer;
 109         int crypt_quiesced;
 110 };
 111
 112 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 113                                 spinlock_t *lock);
 114 void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
 115 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
 116 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
 117 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
 118 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 119                                     struct lib80211_crypt_data **crypt);
 120
 121 #endif /* LIB80211_H */