linux/crypto/proc.c
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   1/*
   2 * Scatterlist Cryptographic API.
   3 *
   4 * Procfs information.
   5 *
   6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   7 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
   8 *
   9 * This program is free software; you can redistribute it and/or modify it
  10 * under the terms of the GNU General Public License as published by the Free
  11 * Software Foundation; either version 2 of the License, or (at your option) 
  12 * any later version.
  13 *
  14 */
  15
  16#include <asm/atomic.h>
  17#include <linux/init.h>
  18#include <linux/crypto.h>
  19#include <linux/rwsem.h>
  20#include <linux/proc_fs.h>
  21#include <linux/seq_file.h>
  22#include "internal.h"
  23
  24static void *c_start(struct seq_file *m, loff_t *pos)
  25{
  26        struct list_head *v;
  27        loff_t n = *pos;
  28
  29        down_read(&crypto_alg_sem);
  30        list_for_each(v, &crypto_alg_list)
  31                if (!n--)
  32                        return list_entry(v, struct crypto_alg, cra_list);
  33        return NULL;
  34}
  35
  36static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  37{
  38        struct list_head *v = p;
  39        
  40        (*pos)++;
  41        v = v->next;
  42        return (v == &crypto_alg_list) ?
  43                NULL : list_entry(v, struct crypto_alg, cra_list);
  44}
  45
  46static void c_stop(struct seq_file *m, void *p)
  47{
  48        up_read(&crypto_alg_sem);
  49}
  50
  51static int c_show(struct seq_file *m, void *p)
  52{
  53        struct crypto_alg *alg = (struct crypto_alg *)p;
  54        
  55        seq_printf(m, "name         : %s\n", alg->cra_name);
  56        seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  57        seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  58        seq_printf(m, "priority     : %d\n", alg->cra_priority);
  59        seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  60        
  61        switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
  62        case CRYPTO_ALG_TYPE_CIPHER:
  63                seq_printf(m, "type         : cipher\n");
  64                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  65                seq_printf(m, "min keysize  : %u\n",
  66                                        alg->cra_cipher.cia_min_keysize);
  67                seq_printf(m, "max keysize  : %u\n",
  68                                        alg->cra_cipher.cia_max_keysize);
  69                break;
  70                
  71        case CRYPTO_ALG_TYPE_DIGEST:
  72                seq_printf(m, "type         : digest\n");
  73                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  74                seq_printf(m, "digestsize   : %u\n",
  75                           alg->cra_digest.dia_digestsize);
  76                break;
  77        case CRYPTO_ALG_TYPE_COMPRESS:
  78                seq_printf(m, "type         : compression\n");
  79                break;
  80        default:
  81                if (alg->cra_type && alg->cra_type->show)
  82                        alg->cra_type->show(m, alg);
  83                else
  84                        seq_printf(m, "type         : unknown\n");
  85                break;
  86        }
  87
  88        seq_putc(m, '\n');
  89        return 0;
  90}
  91
  92static struct seq_operations crypto_seq_ops = {
  93        .start          = c_start,
  94        .next           = c_next,
  95        .stop           = c_stop,
  96        .show           = c_show
  97};
  98
  99static int crypto_info_open(struct inode *inode, struct file *file)
 100{
 101        return seq_open(file, &crypto_seq_ops);
 102}
 103        
 104static struct file_operations proc_crypto_ops = {
 105        .open           = crypto_info_open,
 106        .read           = seq_read,
 107        .llseek         = seq_lseek,
 108        .release        = seq_release
 109};
 110
 111void __init crypto_init_proc(void)
 112{
 113        struct proc_dir_entry *proc;
 114        
 115        proc = create_proc_entry("crypto", 0, NULL);
 116        if (proc)
 117                proc->proc_fops = &proc_crypto_ops;
 118}
 119
 120void __exit crypto_exit_proc(void)
 121{
 122        remove_proc_entry("crypto", NULL);
 123}
 124
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