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/* 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. */
  37const 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
  42enum {
  43        IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
  44};
  45
  46struct module;
  47
  48struct 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
  97struct 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
 104struct 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
 117int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 118                                spinlock_t *lock);
 119void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
 120int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
 121int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
 122struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
 123void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
 124                                    struct lib80211_crypt_data **crypt);
 125
 126#endif /* LIB80211_H */
 127