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 /* print_ssid() is intended to be used in debug (and possibly error)
  36  * messages. It should never be used for passing ssid to user space. */
  37 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
  38 #define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
  39
  40 #define NUM_WEP_KEYS    4
  41
  42 enum {
  43         IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  44 };
  45
  46 struct module;
  47
  48 struct lib80211_crypto_ops {
  49         const char *name;
  50         struct list_head list;
  51
  52         /* init new crypto context (e.g., allocate private data space,
  53          * select IV, etc.); returns NULL on failure or pointer to allocated
  54          * private data on success */
  55         void *(*init) (int keyidx);
  56
  57         /* deinitialize crypto context and free allocated private data */
  58         void (*deinit) (void *priv);
  59
  60         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  61          * value from decrypt_mpdu is passed as the keyidx value for
  62          * decrypt_msdu. skb must have enough head and tail room for the
  63          * encryption; if not, error will be returned; these functions are
  64          * called for all MPDUs (i.e., fragments).
  65          */
  66         int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  67         int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  68
  69         /* These functions are called for full MSDUs, i.e. full frames.
  70          * These can be NULL if full MSDU operations are not needed. */
  71         int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  72         int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  73                              void *priv);
  74
  75         int (*set_key) (void *key, int len, u8 * seq, void *priv);
  76         int (*get_key) (void *key, int len, u8 * seq, void *priv);
  77
  78         /* procfs handler for printing out key information and possible
  79          * statistics */
  80         void (*print_stats) (struct seq_file *m, void *priv);
  81
  82         /* Crypto specific flag get/set for configuration settings */
  83         unsigned long (*get_flags) (void *priv);
  84         unsigned long (*set_flags) (unsigned long flags, void *priv);
  85
  86         /* maximum number of bytes added by encryption; encrypt buf is
  87          * allocated with extra_prefix_len bytes, copy of in_buf, and
  88          * extra_postfix_len; encrypt need not use all this space, but
  89          * the result must start at the beginning of the buffer and correct
  90          * length must be returned */
  91         int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  92         int extra_msdu_prefix_len, extra_msdu_postfix_len;
  93
  94         struct module *owner;
  95 };
  96
  97 struct lib80211_crypt_data {
  98         struct list_head list;  /* delayed deletion list */
  99         struct lib80211_crypto_ops *ops;
 100         void *priv;
 101         atomic_t refcnt;
 102 };
 103
 104 struct lib80211_crypt_info {
 105         char *name;
 106         /* Most clients will already have a lock,
 107            so just point to that. */
 108         spinlock_t *lock;
 109
 110         struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
 111         int tx_keyidx;          /* default TX key index (crypt[tx_keyidx]) */
 112         struct list_head crypt_deinit_list;
 113         struct timer_list crypt_deinit_timer;
 114         int crypt_quiesced;
 115 };
 116
 117 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 118                                 spinlock_t *lock);
 119 void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
 120 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
 121 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
 122 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
 123 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 124                                     struct lib80211_crypt_data **crypt);
 125
 126 #endif /* LIB80211_H */