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ieee80211_crypt.h
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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
7  * Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
8  *
9  * Adaption to a generic IEEE 802.11 stack by James Ketrenos
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 
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 */
67 
68  struct module *owner;
69 };
70 
72  struct list_head list; /* delayed deletion list */
74  void *priv;
76 };
77 
82 void ieee80211_crypt_deinit_handler(unsigned long);
84  struct ieee80211_crypt_data **crypt);
85 
86 #endif