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/module.h>
  29 #include <linux/atomic.h>
  30 #include <linux/if.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/ieee80211.h>
  33 #include <linux/timer.h>
  34 /* print_ssid() is intended to be used in debug (and possibly error)
  35  * messages. It should never be used for passing ssid to user space. */
  36 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
  37 #define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
  38
  39 #define NUM_WEP_KEYS    4
  40
  41 enum {
  42         IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  43 };
  44
  45 struct lib80211_crypto_ops {
  46         const char *name;
  47         struct list_head list;
  48
  49         /* init new crypto context (e.g., allocate private data space,
  50          * select IV, etc.); returns NULL on failure or pointer to allocated
  51          * private data on success */
  52         void *(*init) (int keyidx);
  53
  54         /* deinitialize crypto context and free allocated private data */
  55         void (*deinit) (void *priv);
  56
  57         /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
  58          * value from decrypt_mpdu is passed as the keyidx value for
  59          * decrypt_msdu. skb must have enough head and tail room for the
  60          * encryption; if not, error will be returned; these functions are
  61          * called for all MPDUs (i.e., fragments).
  62          */
  63         int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  64         int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
  65
  66         /* These functions are called for full MSDUs, i.e. full frames.
  67          * These can be NULL if full MSDU operations are not needed. */
  68         int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
  69         int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
  70                              void *priv);
  71
  72         int (*set_key) (void *key, int len, u8 * seq, void *priv);
  73         int (*get_key) (void *key, int len, u8 * seq, void *priv);
  74
  75         /* procfs handler for printing out key information and possible
  76          * statistics */
  77         char *(*print_stats) (char *p, void *priv);
  78
  79         /* Crypto specific flag get/set for configuration settings */
  80         unsigned long (*get_flags) (void *priv);
  81         unsigned long (*set_flags) (unsigned long flags, void *priv);
  82
  83         /* maximum number of bytes added by encryption; encrypt buf is
  84          * allocated with extra_prefix_len bytes, copy of in_buf, and
  85          * extra_postfix_len; encrypt need not use all this space, but
  86          * the result must start at the beginning of the buffer and correct
  87          * length must be returned */
  88         int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
  89         int extra_msdu_prefix_len, extra_msdu_postfix_len;
  90
  91         struct module *owner;
  92 };
  93
  94 struct lib80211_crypt_data {
  95         struct list_head list;  /* delayed deletion list */
  96         struct lib80211_crypto_ops *ops;
  97         void *priv;
  98         atomic_t refcnt;
  99 };
 100
 101 struct lib80211_crypt_info {
 102         char *name;
 103         /* Most clients will already have a lock,
 104            so just point to that. */
 105         spinlock_t *lock;
 106
 107         struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
 108         int tx_keyidx;          /* default TX key index (crypt[tx_keyidx]) */
 109         struct list_head crypt_deinit_list;
 110         struct timer_list crypt_deinit_timer;
 111         int crypt_quiesced;
 112 };
 113
 114 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 115                                 spinlock_t *lock);
 116 void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
 117 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
 118 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
 119 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
 120 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 121                                     struct lib80211_crypt_data **crypt);
 122
 123 #endif /* LIB80211_H */