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
  21 extern struct list_head crypto_alg_list;
  22 extern struct rw_semaphore crypto_alg_sem;
  23
  24 static 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
  36 static 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
  46 static void c_stop(struct seq_file *m, void *p)
  47 {
  48         up_read(&crypto_alg_sem);
  49 }
  50
  51 static 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
  86 static struct seq_operations crypto_seq_ops = {
  87         .start          = c_start,
  88         .next           = c_next,
  89         .stop           = c_stop,
  90         .show           = c_show
  91 };
  92
  93 static int crypto_info_open(struct inode *inode, struct file *file)
  94 {
  95         return seq_open(file, &crypto_seq_ops);
  96 }
  97
  98 static 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
 105 void __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 }