Release 4.7 include/net/lib80211.h

/*
 * lib80211.h -- common bits for IEEE802.11 wireless drivers
 *
 * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
 *
 * 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
 * <j@w1.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
 *
 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
 * <jketreno@linux.intel.com>
 *
 * 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>


#define NUM_WEP_KEYS	4

enum {
	
IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
};

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 */
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