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Linux/crypto/internal.h

  1 /*
  2  * Cryptographic API.
  3  *
  4  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  5  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License as published by the Free
  9  * Software Foundation; either version 2 of the License, or (at your option)
 10  * any later version.
 11  *
 12  */
 13 #ifndef _CRYPTO_INTERNAL_H
 14 #define _CRYPTO_INTERNAL_H
 15 
 16 #include <crypto/algapi.h>
 17 #include <linux/completion.h>
 18 #include <linux/mm.h>
 19 #include <linux/highmem.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/init.h>
 22 #include <linux/list.h>
 23 #include <linux/module.h>
 24 #include <linux/kernel.h>
 25 #include <linux/notifier.h>
 26 #include <linux/rwsem.h>
 27 #include <linux/slab.h>
 28 
 29 /* Crypto notification events. */
 30 enum {
 31         CRYPTO_MSG_ALG_REQUEST,
 32         CRYPTO_MSG_ALG_REGISTER,
 33         CRYPTO_MSG_ALG_UNREGISTER,
 34         CRYPTO_MSG_TMPL_REGISTER,
 35         CRYPTO_MSG_TMPL_UNREGISTER,
 36 };
 37 
 38 struct crypto_instance;
 39 struct crypto_template;
 40 
 41 struct crypto_larval {
 42         struct crypto_alg alg;
 43         struct crypto_alg *adult;
 44         struct completion completion;
 45         u32 mask;
 46 };
 47 
 48 extern struct list_head crypto_alg_list;
 49 extern struct rw_semaphore crypto_alg_sem;
 50 extern struct blocking_notifier_head crypto_chain;
 51 
 52 #ifdef CONFIG_PROC_FS
 53 void __init crypto_init_proc(void);
 54 void __exit crypto_exit_proc(void);
 55 #else
 56 static inline void crypto_init_proc(void)
 57 { }
 58 static inline void crypto_exit_proc(void)
 59 { }
 60 #endif
 61 
 62 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg)
 63 {
 64         return alg->cra_ctxsize;
 65 }
 66 
 67 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
 68 {
 69         return alg->cra_ctxsize;
 70 }
 71 
 72 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
 73 struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask);
 74 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 75 
 76 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 77 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 78 
 79 struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask);
 80 void crypto_larval_kill(struct crypto_alg *alg);
 81 struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask);
 82 void crypto_alg_tested(const char *name, int err);
 83 
 84 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 85                           struct crypto_alg *nalg);
 86 void crypto_remove_final(struct list_head *list);
 87 void crypto_shoot_alg(struct crypto_alg *alg);
 88 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 89                                       u32 mask);
 90 void *crypto_create_tfm(struct crypto_alg *alg,
 91                         const struct crypto_type *frontend);
 92 struct crypto_alg *crypto_find_alg(const char *alg_name,
 93                                    const struct crypto_type *frontend,
 94                                    u32 type, u32 mask);
 95 void *crypto_alloc_tfm(const char *alg_name,
 96                        const struct crypto_type *frontend, u32 type, u32 mask);
 97 
 98 int crypto_register_notifier(struct notifier_block *nb);
 99 int crypto_unregister_notifier(struct notifier_block *nb);
100 int crypto_probing_notify(unsigned long val, void *v);
101 
102 unsigned int crypto_alg_extsize(struct crypto_alg *alg);
103 
104 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
105                         u32 type, u32 mask);
106 
107 static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
108 {
109         atomic_inc(&alg->cra_refcnt);
110         return alg;
111 }
112 
113 static inline void crypto_alg_put(struct crypto_alg *alg)
114 {
115         if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
116                 alg->cra_destroy(alg);
117 }
118 
119 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
120 {
121         return try_module_get(tmpl->module);
122 }
123 
124 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
125 {
126         module_put(tmpl->module);
127 }
128 
129 static inline int crypto_is_larval(struct crypto_alg *alg)
130 {
131         return alg->cra_flags & CRYPTO_ALG_LARVAL;
132 }
133 
134 static inline int crypto_is_dead(struct crypto_alg *alg)
135 {
136         return alg->cra_flags & CRYPTO_ALG_DEAD;
137 }
138 
139 static inline int crypto_is_moribund(struct crypto_alg *alg)
140 {
141         return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
142 }
143 
144 static inline void crypto_notify(unsigned long val, void *v)
145 {
146         blocking_notifier_call_chain(&crypto_chain, val, v);
147 }
148 
149 #endif  /* _CRYPTO_INTERNAL_H */
150 
151 

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