LXR 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#include <asm/kmap_types.h>
  29
  30/* Crypto notification events. */
  31enum {
  32        CRYPTO_MSG_ALG_REQUEST,
  33        CRYPTO_MSG_ALG_REGISTER,
  34        CRYPTO_MSG_ALG_UNREGISTER,
  35        CRYPTO_MSG_TMPL_REGISTER,
  36        CRYPTO_MSG_TMPL_UNREGISTER,
  37};
  38
  39struct crypto_instance;
  40struct crypto_template;
  41
  42struct crypto_larval {
  43        struct crypto_alg alg;
  44        struct crypto_alg *adult;
  45        struct completion completion;
  46        u32 mask;
  47};
  48
  49extern struct list_head crypto_alg_list;
  50extern struct rw_semaphore crypto_alg_sem;
  51extern struct blocking_notifier_head crypto_chain;
  52
  53static inline enum km_type crypto_kmap_type(int out)
  54{
  55        enum km_type type;
  56
  57        if (in_softirq())
  58                type = out * (KM_SOFTIRQ1 - KM_SOFTIRQ0) + KM_SOFTIRQ0;
  59        else
  60                type = out * (KM_USER1 - KM_USER0) + KM_USER0;
  61
  62        return type;
  63}
  64
  65static inline void *crypto_kmap(struct page *page, int out)
  66{
  67        return kmap_atomic(page, crypto_kmap_type(out));
  68}
  69
  70static inline void crypto_kunmap(void *vaddr, int out)
  71{
  72        kunmap_atomic(vaddr, crypto_kmap_type(out));
  73}
  74
  75static inline void crypto_yield(u32 flags)
  76{
  77        if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
  78                cond_resched();
  79}
  80
  81#ifdef CONFIG_PROC_FS
  82void __init crypto_init_proc(void);
  83void __exit crypto_exit_proc(void);
  84#else
  85static inline void crypto_init_proc(void)
  86{ }
  87static inline void crypto_exit_proc(void)
  88{ }
  89#endif
  90
  91static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg)
  92{
  93        unsigned int len = alg->cra_ctxsize;
  94
  95        if (alg->cra_alignmask) {
  96                len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
  97                len += alg->cra_digest.dia_digestsize;
  98        }
  99
 100        return len;
 101}
 102
 103static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg)
 104{
 105        return alg->cra_ctxsize;
 106}
 107
 108static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
 109{
 110        return alg->cra_ctxsize;
 111}
 112
 113struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
 114struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
 115struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 116
 117int crypto_init_digest_ops(struct crypto_tfm *tfm);
 118int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 119int crypto_init_compress_ops(struct crypto_tfm *tfm);
 120
 121void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 122void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 123void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 124
 125void crypto_larval_error(const char *name, u32 type, u32 mask);
 126
 127void crypto_shoot_alg(struct crypto_alg *alg);
 128struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 129                                      u32 mask);
 130
 131int crypto_register_instance(struct crypto_template *tmpl,
 132                             struct crypto_instance *inst);
 133
 134int crypto_register_notifier(struct notifier_block *nb);
 135int crypto_unregister_notifier(struct notifier_block *nb);
 136
 137static inline void crypto_alg_put(struct crypto_alg *alg)
 138{
 139        if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
 140                alg->cra_destroy(alg);
 141}
 142
 143static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 144{
 145        return try_module_get(tmpl->module);
 146}
 147
 148static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 149{
 150        module_put(tmpl->module);
 151}
 152
 153static inline int crypto_is_larval(struct crypto_alg *alg)
 154{
 155        return alg->cra_flags & CRYPTO_ALG_LARVAL;
 156}
 157
 158static inline int crypto_is_dead(struct crypto_alg *alg)
 159{
 160        return alg->cra_flags & CRYPTO_ALG_DEAD;
 161}
 162
 163static inline int crypto_is_moribund(struct crypto_alg *alg)
 164{
 165        return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
 166}
 167
 168static inline int crypto_notify(unsigned long val, void *v)
 169{
 170        return blocking_notifier_call_chain(&crypto_chain, val, v);
 171}
 172
 173#endif  /* _CRYPTO_INTERNAL_H */
 174
 175