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/atomic.h> 29 #include <linux/if.h> 30 #include <linux/skbuff.h> 31 #include <linux/ieee80211.h> 32 #include <linux/timer.h> 33 /* print_ssid() is intended to be used in debug (and possibly error) 34 * messages. It should never be used for passing ssid to user space. */ 35 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len); 36 #define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused 37 38 #define NUM_WEP_KEYS 4 39 40 enum { 41 IEEE80211_CRYPTO_TKIP_COUNTERMEASURES = (1 << 0), 42 }; 43 44 struct module; 45 46 struct lib80211_crypto_ops { 47 const char *name; 48 struct list_head list; 49 50 /* init new crypto context (e.g., allocate private data space, 51 * select IV, etc.); returns NULL on failure or pointer to allocated 52 * private data on success */ 53 void *(*init) (int keyidx); 54 55 /* deinitialize crypto context and free allocated private data */ 56 void (*deinit) (void *priv); 57 58 /* encrypt/decrypt return < 0 on error or >= 0 on success. The return 59 * value from decrypt_mpdu is passed as the keyidx value for 60 * decrypt_msdu. skb must have enough head and tail room for the 61 * encryption; if not, error will be returned; these functions are 62 * called for all MPDUs (i.e., fragments). 63 */ 64 int (*encrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv); 65 int (*decrypt_mpdu) (struct sk_buff * skb, int hdr_len, void *priv); 66 67 /* These functions are called for full MSDUs, i.e. full frames. 68 * These can be NULL if full MSDU operations are not needed. */ 69 int (*encrypt_msdu) (struct sk_buff * skb, int hdr_len, void *priv); 70 int (*decrypt_msdu) (struct sk_buff * skb, int keyidx, int hdr_len, 71 void *priv); 72 73 int (*set_key) (void *key, int len, u8 * seq, void *priv); 74 int (*get_key) (void *key, int len, u8 * seq, void *priv); 75 76 /* procfs handler for printing out key information and possible 77 * statistics */ 78 char *(*print_stats) (char *p, void *priv); 79 80 /* Crypto specific flag get/set for configuration settings */ 81 unsigned long (*get_flags) (void *priv); 82 unsigned long (*set_flags) (unsigned long flags, void *priv); 83 84 /* maximum number of bytes added by encryption; encrypt buf is 85 * allocated with extra_prefix_len bytes, copy of in_buf, and 86 * extra_postfix_len; encrypt need not use all this space, but 87 * the result must start at the beginning of the buffer and correct 88 * length must be returned */ 89 int extra_mpdu_prefix_len, extra_mpdu_postfix_len; 90 int extra_msdu_prefix_len, extra_msdu_postfix_len; 91 92 struct module *owner; 93 }; 94 95 struct lib80211_crypt_data { 96 struct list_head list; /* delayed deletion list */ 97 struct lib80211_crypto_ops *ops; 98 void *priv; 99 atomic_t refcnt; 100 }; 101 102 struct lib80211_crypt_info { 103 char *name; 104 /* Most clients will already have a lock, 105 so just point to that. */ 106 spinlock_t *lock; 107 108 struct lib80211_crypt_data *crypt[NUM_WEP_KEYS]; 109 int tx_keyidx; /* default TX key index (crypt[tx_keyidx]) */ 110 struct list_head crypt_deinit_list; 111 struct timer_list crypt_deinit_timer; 112 int crypt_quiesced; 113 }; 114 115 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, 116 spinlock_t *lock); 117 void lib80211_crypt_info_free(struct lib80211_crypt_info *info); 118 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops); 119 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops); 120 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name); 121 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, 122 struct lib80211_crypt_data **crypt); 123 124 #endif /* LIB80211_H */ 125