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* lib80211.h -- common bits for IEEE802.11 wireless drivers
* Copyright (c) 2008, John W. Linville <>
* Some bits copied from old ieee80211 component, w/ original copyright
* notices below:
* Original code based on Host AP (software wireless LAN access point) driver
* for Intersil Prism2/2.5/3.
* Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
* <>
* Copyright (c) 2002-2003, Jouni Malinen <>
* Adaption to a generic IEEE 802.11 stack by James Ketrenos
* <>
* Copyright (c) 2004, Intel Corporation
#ifndef LIB80211_H
#define LIB80211_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/atomic.h>
#include <linux/if.h>
#include <linux/skbuff.h>
#include <linux/ieee80211.h>
#include <linux/timer.h>
#include <linux/seq_file.h>
/* print_ssid() is intended to be used in debug (and possibly error)
* messages. It should never be used for passing ssid to user space. */
const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
#define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
#define NUM_WEP_KEYS 4
enum {
struct module;
struct lib80211_crypto_ops {
const char *name;
struct list_head list;
/* init new crypto context (e.g., allocate private data space,
* select IV, etc.); returns NULL on failure or pointer to allocated
* private data on success */
void *(*init) (int keyidx);
/* deinitialize crypto context and free allocated private data */
void (*deinit) (void *priv);
/* encrypt/decrypt return < 0 on error or >= 0 on success. The return
* value from decrypt_mpdu is passed as the keyidx value for
* decrypt_msdu. skb must have enough head and tail room for the
* encryption; if not, error will be returned; these functions are
* called for all MPDUs (i.e., fragments).
int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
/* These functions are called for full MSDUs, i.e. full frames.
* These can be NULL if full MSDU operations are not needed. */
int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
void *priv);
int (*set_key) (void *key, int len, u8 * seq, void *priv);
int (*get_key) (void *key, int len, u8 * seq, void *priv);
/* procfs handler for printing out key information and possible
* statistics */
void (*print_stats) (struct seq_file *m, void *priv);
/* Crypto specific flag get/set for configuration settings */
unsigned long (*get_flags) (void *priv);
unsigned long (*set_flags) (unsigned long flags, void *priv);
/* maximum number of bytes added by encryption; encrypt buf is
* allocated with extra_prefix_len bytes, copy of in_buf, and
* extra_postfix_len; encrypt need not use all this space, but
* the result must start at the beginning of the buffer and correct
* length must be returned */
int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
int extra_msdu_prefix_len, extra_msdu_postfix_len;
struct module *owner;
struct lib80211_crypt_data {
struct list_head list; /* delayed deletion list */
struct lib80211_crypto_ops *ops;
void *priv;
atomic_t refcnt;
struct lib80211_crypt_info {
char *name;
/* Most clients will already have a lock,
so just point to that. */
spinlock_t *lock;
struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
int tx_keyidx; /* default TX key index (crypt[tx_keyidx]) */
struct list_head crypt_deinit_list;
struct timer_list crypt_deinit_timer;
int crypt_quiesced;
int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
spinlock_t *lock);
void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
struct lib80211_crypt_data **crypt);
#endif /* LIB80211_H */