xref: /openbmc/linux/include/net/lib80211.h (revision b6dcefde)
1 /*
2  * lib80211.h -- common bits for IEEE802.11 wireless drivers
3  *
4  * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
5  *
6  * Some bits copied from old ieee80211 component, w/ original copyright
7  * notices below:
8  *
9  * Original code based on Host AP (software wireless LAN access point) driver
10  * for Intersil Prism2/2.5/3.
11  *
12  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
13  * <j@w1.fi>
14  * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
15  *
16  * Adaption to a generic IEEE 802.11 stack by James Ketrenos
17  * <jketreno@linux.intel.com>
18  *
19  * Copyright (c) 2004, Intel Corporation
20  *
21  */
22 
23 #ifndef LIB80211_H
24 #define LIB80211_H
25 
26 #include <linux/types.h>
27 #include <linux/list.h>
28 #include <linux/module.h>
29 #include <asm/atomic.h>
30 #include <linux/if.h>
31 #include <linux/skbuff.h>
32 #include <linux/ieee80211.h>
33 #include <linux/timer.h>
34 /* print_ssid() is intended to be used in debug (and possibly error)
35  * messages. It should never be used for passing ssid to user space. */
36 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
37 #define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
38 
39 #define NUM_WEP_KEYS	4
40 
41 enum {
42 	IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0),
43 };
44 
45 struct lib80211_crypto_ops {
46 	const char *name;
47 	struct list_head list;
48 
49 	/* init new crypto context (e.g., allocate private data space,
50 	 * select IV, etc.); returns NULL on failure or pointer to allocated
51 	 * private data on success */
52 	void *(*init) (int keyidx);
53 
54 	/* deinitialize crypto context and free allocated private data */
55 	void (*deinit) (void *priv);
56 
57 	int (*build_iv) (struct sk_buff * skb, int hdr_len,
58 			 u8 *key, int keylen, void *priv);
59 
60 	/* encrypt/decrypt return < 0 on error or >= 0 on success. The return
61 	 * value from decrypt_mpdu is passed as the keyidx value for
62 	 * decrypt_msdu. skb must have enough head and tail room for the
63 	 * encryption; if not, error will be returned; these functions are
64 	 * called for all MPDUs (i.e., fragments).
65 	 */
66 	int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
67 	int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv);
68 
69 	/* These functions are called for full MSDUs, i.e. full frames.
70 	 * These can be NULL if full MSDU operations are not needed. */
71 	int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv);
72 	int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len,
73 			     void *priv);
74 
75 	int (*set_key) (void *key, int len, u8 * seq, void *priv);
76 	int (*get_key) (void *key, int len, u8 * seq, void *priv);
77 
78 	/* procfs handler for printing out key information and possible
79 	 * statistics */
80 	char *(*print_stats) (char *p, void *priv);
81 
82 	/* Crypto specific flag get/set for configuration settings */
83 	unsigned long (*get_flags) (void *priv);
84 	unsigned long (*set_flags) (unsigned long flags, void *priv);
85 
86 	/* maximum number of bytes added by encryption; encrypt buf is
87 	 * allocated with extra_prefix_len bytes, copy of in_buf, and
88 	 * extra_postfix_len; encrypt need not use all this space, but
89 	 * the result must start at the beginning of the buffer and correct
90 	 * length must be returned */
91 	int extra_mpdu_prefix_len, extra_mpdu_postfix_len;
92 	int extra_msdu_prefix_len, extra_msdu_postfix_len;
93 
94 	struct module *owner;
95 };
96 
97 struct lib80211_crypt_data {
98 	struct list_head list;	/* delayed deletion list */
99 	struct lib80211_crypto_ops *ops;
100 	void *priv;
101 	atomic_t refcnt;
102 };
103 
104 struct lib80211_crypt_info {
105 	char *name;
106 	/* Most clients will already have a lock,
107 	   so just point to that. */
108 	spinlock_t *lock;
109 
110 	struct lib80211_crypt_data *crypt[NUM_WEP_KEYS];
111 	int tx_keyidx;		/* default TX key index (crypt[tx_keyidx]) */
112 	struct list_head crypt_deinit_list;
113 	struct timer_list crypt_deinit_timer;
114 	int crypt_quiesced;
115 };
116 
117 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
118                                 spinlock_t *lock);
119 void lib80211_crypt_info_free(struct lib80211_crypt_info *info);
120 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops);
121 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops);
122 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name);
123 void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *, int);
124 void lib80211_crypt_deinit_handler(unsigned long);
125 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
126 				    struct lib80211_crypt_data **crypt);
127 void lib80211_crypt_quiescing(struct lib80211_crypt_info *info);
128 
129 #endif /* LIB80211_H */
130