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 * <jkmaline@cc.hut.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.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/skbuff.h>
27
28 struct ieee80211_crypto_ops {
29 const char *name;
30
31 /* init new crypto context (e.g., allocate private data space,
32 * select IV, etc.); returns NULL on failure or pointer to allocated
33 * private data on success */
34 void * (*init)(int keyidx);
35
36 /* deinitialize crypto context and free allocated private data */
37 void (*deinit)(void *priv);
38
39 /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
40 * value from decrypt_mpdu is passed as the keyidx value for
41 * decrypt_msdu. skb must have enough head and tail room for the
42 * encryption; if not, error will be returned; these functions are
43 * called for all MPDUs (i.e., fragments).
44 */
45 int (*encrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
46 int (*decrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
47
48 /* These functions are called for full MSDUs, i.e. full frames.
49 * These can be NULL if full MSDU operations are not needed. */
50 int (*encrypt_msdu)(struct sk_buff *skb, int hdr_len, void *priv);
51 int (*decrypt_msdu)(struct sk_buff *skb, int keyidx, int hdr_len,
52 void *priv);
53
54 int (*set_key)(void *key, int len, u8 *seq, void *priv);
55 int (*get_key)(void *key, int len, u8 *seq, void *priv);
56
57 /* procfs handler for printing out key information and possible
58 * statistics */
59 char * (*print_stats)(char *p, void *priv);
60
61 /* maximum number of bytes added by encryption; encrypt buf is
62 * allocated with extra_prefix_len bytes, copy of in_buf, and
63 * extra_postfix_len; encrypt need not use all this space, but
64 * the result must start at the beginning of the buffer and correct
65 * length must be returned */
66 int extra_prefix_len, extra_postfix_len;
67
68 struct module *owner;
69 };
70
71 struct ieee80211_crypt_data {
72 struct list_head list; /* delayed deletion list */
73 struct ieee80211_crypto_ops *ops;
74 void *priv;
75 atomic_t refcnt;
76 };
77
78 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops);
79 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops);
80 struct ieee80211_crypto_ops * ieee80211_get_crypto_ops(const char *name);
81 void ieee80211_crypt_deinit_entries(struct ieee80211_device *, int);
82 void ieee80211_crypt_deinit_handler(unsigned long);
83 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
84 struct ieee80211_crypt_data **crypt);
85
86 #endif
87
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