1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Original code based on Host AP (software wireless LAN access point) driver
4 * for Intersil Prism2/2.5/3.
5 *
6 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
7 * <jkmaline@cc.hut.fi>
8 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
9 *
10 * Adaption to a generic IEEE 802.11 stack by James Ketrenos
11 * <jketreno@linux.intel.com>
12 *
13 * Copyright (c) 2004, Intel Corporation
14 */
15
16 /*
17 * This file defines the interface to the ieee80211 crypto module.
18 */
19 #ifndef IEEE80211_CRYPT_H
20 #define IEEE80211_CRYPT_H
21
22 #include <linux/skbuff.h>
23
24 struct ieee80211_crypto_ops {
25 const char *name;
26
27 /* init new crypto context (e.g., allocate private data space,
28 * select IV, etc.); returns NULL on failure or pointer to allocated
29 * private data on success
30 */
31 void * (*init)(int keyidx);
32
33 /* deinitialize crypto context and free allocated private data */
34 void (*deinit)(void *priv);
35
36 /* encrypt/decrypt return < 0 on error or >= 0 on success. The return
37 * value from decrypt_mpdu is passed as the keyidx value for
38 * decrypt_msdu. skb must have enough head and tail room for the
39 * encryption; if not, error will be returned; these functions are
40 * called for all MPDUs (i.e., fragments).
41 */
42 int (*encrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
43 int (*decrypt_mpdu)(struct sk_buff *skb, int hdr_len, void *priv);
44
45 /* These functions are called for full MSDUs, i.e. full frames.
46 * These can be NULL if full MSDU operations are not needed.
47 */
48 int (*encrypt_msdu)(struct sk_buff *skb, int hdr_len, void *priv);
49 int (*decrypt_msdu)(struct sk_buff *skb, int keyidx, int hdr_len,
50 void *priv);
51
52 int (*set_key)(void *key, int len, u8 *seq, void *priv);
53 int (*get_key)(void *key, int len, u8 *seq, void *priv);
54
55 /* procfs handler for printing out key information and possible
56 * statistics
57 */
58 char * (*print_stats)(char *p, void *priv);
59
60 /* maximum number of bytes added by encryption; encrypt buf is
61 * allocated with extra_prefix_len bytes, copy of in_buf, and
62 * extra_postfix_len; encrypt need not use all this space, but
63 * the result must start at the beginning of the buffer and correct
64 * length must be returned
65 */
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 *ieee, int force);
82 void ieee80211_crypt_deinit_handler(struct timer_list *t);
83 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
84 struct ieee80211_crypt_data **crypt);
85
86 #endif