LXR linux/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
  37enum {
  38        IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  39};
  40
  41struct module;
  42
  43struct 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
  92struct 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
  99struct 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
 112int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 113                                spinlock_t *lock);
 114void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
 115int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
 116int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
 117struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
 118void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 119                                    struct lib80211_crypt_data **crypt);
 120
 121#endif /* LIB80211_H */
 122