LXR RHEL4/crypto/proc.c

   1/*
   2 * Scatterlist Cryptographic API.
   3 *
   4 * Procfs information.
   5 *
   6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by the Free
  10 * Software Foundation; either version 2 of the License, or (at your option) 
  11 * any later version.
  12 *
  13 */
  14#include <linux/init.h>
  15#include <linux/crypto.h>
  16#include <linux/rwsem.h>
  17#include <linux/proc_fs.h>
  18#include <linux/seq_file.h>
  19#include "internal.h"
  20
  21extern struct list_head crypto_alg_list;
  22extern struct rw_semaphore crypto_alg_sem;
  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, "module       : %s\n", module_name(alg->cra_module));
  57        
  58        switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
  59        case CRYPTO_ALG_TYPE_CIPHER:
  60                seq_printf(m, "type         : cipher\n");
  61                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  62                seq_printf(m, "min keysize  : %u\n",
  63                                        alg->cra_cipher.cia_min_keysize);
  64                seq_printf(m, "max keysize  : %u\n",
  65                                        alg->cra_cipher.cia_max_keysize);
  66                break;
  67                
  68        case CRYPTO_ALG_TYPE_DIGEST:
  69                seq_printf(m, "type         : digest\n");
  70                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  71                seq_printf(m, "digestsize   : %u\n",
  72                           alg->cra_digest.dia_digestsize);
  73                break;
  74        case CRYPTO_ALG_TYPE_COMPRESS:
  75                seq_printf(m, "type         : compression\n");
  76                break;
  77        default:
  78                seq_printf(m, "type         : unknown\n");
  79                break;
  80        }
  81
  82        seq_putc(m, '\n');
  83        return 0;
  84}
  85
  86static struct seq_operations crypto_seq_ops = {
  87        .start          = c_start,
  88        .next           = c_next,
  89        .stop           = c_stop,
  90        .show           = c_show
  91};
  92
  93static int crypto_info_open(struct inode *inode, struct file *file)
  94{
  95        return seq_open(file, &crypto_seq_ops);
  96}
  97        
  98static struct file_operations proc_crypto_ops = {
  99        .open           = crypto_info_open,
 100        .read           = seq_read,
 101        .llseek         = seq_lseek,
 102        .release        = seq_release
 103};
 104
 105void __init crypto_init_proc(void)
 106{
 107        struct proc_dir_entry *proc;
 108        
 109        proc = create_proc_entry("crypto", 0, NULL);
 110        if (proc)
 111                proc->proc_fops = &proc_crypto_ops;
 112}
 113