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 const 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(const struct lib80211_crypto_ops *ops); 117 int lib80211_unregister_crypto_ops(const struct lib80211_crypto_ops *ops); 118 const 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