crypto/proc.c

   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
  24 static void *c_start(struct seq_file *m, loff_t *pos)
  25 {
  26         down_read(&crypto_alg_sem);
  27         return seq_list_start(&crypto_alg_list, *pos);
  28 }
  29
  30 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  31 {
  32         return seq_list_next(p, &crypto_alg_list, pos);
  33 }
  34
  35 static void c_stop(struct seq_file *m, void *p)
  36 {
  37         up_read(&crypto_alg_sem);
  38 }
  39
  40 static int c_show(struct seq_file *m, void *p)
  41 {
  42         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  43
  44         seq_printf(m, "name         : %s\n", alg->cra_name);
  45         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  46         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  47         seq_printf(m, "priority     : %d\n", alg->cra_priority);
  48         seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  49
  50         switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
  51         case CRYPTO_ALG_TYPE_CIPHER:
  52                 seq_printf(m, "type         : cipher\n");
  53                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  54                 seq_printf(m, "min keysize  : %u\n",
  55                                         alg->cra_cipher.cia_min_keysize);
  56                 seq_printf(m, "max keysize  : %u\n",
  57                                         alg->cra_cipher.cia_max_keysize);
  58                 break;
  59
  60         case CRYPTO_ALG_TYPE_DIGEST:
  61                 seq_printf(m, "type         : digest\n");
  62                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  63                 seq_printf(m, "digestsize   : %u\n",
  64                            alg->cra_digest.dia_digestsize);
  65                 break;
  66         case CRYPTO_ALG_TYPE_COMPRESS:
  67                 seq_printf(m, "type         : compression\n");
  68                 break;
  69         default:
  70                 if (alg->cra_type && alg->cra_type->show)
  71                         alg->cra_type->show(m, alg);
  72                 else
  73                         seq_printf(m, "type         : unknown\n");
  74                 break;
  75         }
  76
  77         seq_putc(m, '\n');
  78         return 0;
  79 }
  80
  81 static struct seq_operations crypto_seq_ops = {
  82         .start          = c_start,
  83         .next           = c_next,
  84         .stop           = c_stop,
  85         .show           = c_show
  86 };
  87
  88 static int crypto_info_open(struct inode *inode, struct file *file)
  89 {
  90         return seq_open(file, &crypto_seq_ops);
  91 }
  92
  93 static const struct file_operations proc_crypto_ops = {
  94         .open           = crypto_info_open,
  95         .read           = seq_read,
  96         .llseek         = seq_lseek,
  97         .release        = seq_release
  98 };
  99
 100 void __init crypto_init_proc(void)
 101 {
 102         struct proc_dir_entry *proc;
 103
 104         proc = create_proc_entry("crypto", 0, NULL);
 105         if (proc)
 106                 proc->proc_fops = &proc_crypto_ops;
 107 }
 108
 109 void __exit crypto_exit_proc(void)
 110 {
 111         remove_proc_entry("crypto", NULL);
 112 }