1/*
2 * Original code based on Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3.
4 *
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
6 * <j@w1.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
8 *
9 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
10 * <jketreno@linux.intel.com>
11 *
12 * Copyright (c) 2004, Intel Corporation
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation. See README and COPYING for
17 * more details.
18 */
19
20/*
21 * This file defines the interface to the ieee80211 crypto module.
22 */
23#ifndef IEEE80211_CRYPT_H
24#define IEEE80211_CRYPT_H
25
26#include <linux/types.h>
27#include <linux/list.h>
28#include <net/ieee80211.h>
29#include <asm/atomic.h>
30
31enum {
32	IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
33};
34
35struct sk_buff;
36struct module;
37
38struct ieee80211_crypto_ops {
39	const char *name;
40	struct list_head list;
41
42	/* init new crypto context (e.g., allocate private data space,
43	 * select IV, etc.); returns NULL on failure or pointer to allocated
44	 * private data on success */
45	void *(*init) (int keyidx);
46
47	/* deinitialize crypto context and free allocated private data */
48	void (*deinit) (void *priv);
49
50	int (*build_iv) (struct sk_buff * skb, int hdr_len,
51			 u8 *key, int keylen, void *priv);
52
53	/* encrypt/decrypt return < 0 on error or >= 0 on success. The return
54	 * value from decrypt_mpdu is passed as the keyidx value for
55	 * decrypt_msdu. skb must have enough head and tail room for the
56	 * encryption; if not, error will be returned; these functions are
57	 * called for all MPDUs (i.e., fragments).
58	 */
59	int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
60	int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
61
62	/* These functions are called for full MSDUs, i.e. full frames.
63	 * These can be NULL if full MSDU operations are not needed. */
64	int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
65	int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
66			     void *priv);
67
68	int (*set_key) (void *key, int len, u8 * seq, void *priv);
69	int (*get_key) (void *key, int len, u8 * seq, void *priv);
70
71	/* procfs handler for printing out key information and possible
72	 * statistics */
73	char *(*print_stats) (char *p, void *priv);
74
75	/* Crypto specific flag get/set for configuration settings */
76	unsigned long (*get_flags) (void *priv);
77	unsigned long (*set_flags) (unsigned long flags, void *priv);
78
79	/* maximum number of bytes added by encryption; encrypt buf is
80	 * allocated with extra_prefix_len bytes, copy of in_buf, and
81	 * extra_postfix_len; encrypt need not use all this space, but
82	 * the result must start at the beginning of the buffer and correct
83	 * length must be returned */
84	int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
85	int extra_msdu_prefix_len, extra_msdu_postfix_len;
86
87	struct module *owner;
88};
89
90struct ieee80211_crypt_data {
91	struct list_head list;	/* delayed deletion list */
92	struct ieee80211_crypto_ops *ops;
93	void *priv;
94	atomic_t refcnt;
95};
96
97struct ieee80211_device;
98
99int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
100int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
101struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name);
102void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
103void ieee80211_crypt_deinit_handler(unsigned long);
104void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
105				    struct ieee80211_crypt_data **crypt);
106void ieee80211_crypt_quiescing(struct ieee80211_device *ieee);
107
108#endif
109