xref: /openbmc/linux/include/net/lib80211.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * lib80211.h -- common bits for IEEE802.11 wireless drivers
4  *
5  * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
6  *
7  * Some bits copied from old ieee80211 component, w/ original copyright
8  * notices below:
9  *
10  * Original code based on Host AP (software wireless LAN access point) driver
11  * for Intersil Prism2/2.5/3.
12  *
13  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
14  * <j@w1.fi>
15  * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
16  *
17  * Adaption to a generic IEEE 802.11 stack by James Ketrenos
18  * <jketreno@linux.intel.com>
19  *
20  * Copyright (c) 2004, Intel Corporation
21  *
22  */
23 
24 #ifndef LIB80211_H
25 #define LIB80211_H
26 
27 #include <linux/types.h>
28 #include <linux/list.h>
29 #include <linux/atomic.h>
30 #include <linux/if.h>
31 #include <linux/skbuff.h>
32 #include <linux/ieee80211.h>
33 #include <linux/timer.h>
34 #include <linux/seq_file.h>
35 
36 #define NUM_WEP_KEYS	4
37 
38 enum {
39 	IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
40 };
41 
42 struct module;
43 
44 struct lib80211_crypto_ops {
45 	const char *name;
46 	struct list_head list;
47 
48 	/* init new crypto context (e.g., allocate private data space,
49 	 * select IV, etc.); returns NULL on failure or pointer to allocated
50 	 * private data on success */
51 	void *(*init) (int keyidx);
52 
53 	/* deinitialize crypto context and free allocated private data */
54 	void (*deinit) (void *priv);
55 
56 	/* encrypt/decrypt return < 0 on error or >= 0 on success. The return
57 	 * value from decrypt_mpdu is passed as the keyidx value for
58 	 * decrypt_msdu. skb must have enough head and tail room for the
59 	 * encryption; if not, error will be returned; these functions are
60 	 * called for all MPDUs (i.e., fragments).
61 	 */
62 	int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
63 	int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
64 
65 	/* These functions are called for full MSDUs, i.e. full frames.
66 	 * These can be NULL if full MSDU operations are not needed. */
67 	int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
68 	int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
69 			     void *priv);
70 
71 	int (*set_key) (void *key, int len, u8 * seq, void *priv);
72 	int (*get_key) (void *key, int len, u8 * seq, void *priv);
73 
74 	/* procfs handler for printing out key information and possible
75 	 * statistics */
76 	void (*print_stats) (struct seq_file *m, void *priv);
77 
78 	/* Crypto specific flag get/set for configuration settings */
79 	unsigned long (*get_flags) (void *priv);
80 	unsigned long (*set_flags) (unsigned long flags, void *priv);
81 
82 	/* maximum number of bytes added by encryption; encrypt buf is
83 	 * allocated with extra_prefix_len bytes, copy of in_buf, and
84 	 * extra_postfix_len; encrypt need not use all this space, but
85 	 * the result must start at the beginning of the buffer and correct
86 	 * length must be returned */
87 	int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
88 	int extra_msdu_prefix_len, extra_msdu_postfix_len;
89 
90 	struct module *owner;
91 };
92 
93 struct lib80211_crypt_data {
94 	struct list_head list;	/* delayed deletion list */
95 	struct lib80211_crypto_ops *ops;
96 	void *priv;
97 	atomic_t refcnt;
98 };
99 
100 struct lib80211_crypt_info {
101 	char *name;
102 	/* Most clients will already have a lock,
103 	   so just point to that. */
104 	spinlock_t *lock;
105 
106 	struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
107 	int tx_keyidx;		/* default TX key index (crypt[tx_keyidx]) */
108 	struct list_head crypt_deinit_list;
109 	struct timer_list crypt_deinit_timer;
110 	int crypt_quiesced;
111 };
112 
113 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
114                                 spinlock_t *lock);
115 void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
116 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
117 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
118 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
119 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
120 				    struct lib80211_crypt_data **crypt);
121 
122 #endif /* LIB80211_H */
123