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 <linux/atomic.h>
  17 #include <linux/init.h>
  18 #include <linux/crypto.h>
  19 #include <linux/module.h>       /* for module_name() */
  20 #include <linux/rwsem.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include "internal.h"
  24
  25 static void *c_start(struct seq_file *m, loff_t *pos)
  26 {
  27         down_read(&crypto_alg_sem);
  28         return seq_list_start(&crypto_alg_list, *pos);
  29 }
  30
  31 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  32 {
  33         return seq_list_next(p, &crypto_alg_list, pos);
  34 }
  35
  36 static void c_stop(struct seq_file *m, void *p)
  37 {
  38         up_read(&crypto_alg_sem);
  39 }
  40
  41 static int c_show(struct seq_file *m, void *p)
  42 {
  43         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  44
  45         seq_printf(m, "name         : %s\n", alg->cra_name);
  46         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  47         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  48         seq_printf(m, "priority     : %d\n", alg->cra_priority);
  49         seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  50         seq_printf(m, "selftest     : %s\n",
  51                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  52                    "passed" : "unknown");
  53         seq_printf(m, "internal     : %s\n",
  54                    (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
  55                    "yes" : "no");
  56
  57         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  58                 seq_printf(m, "type         : larval\n");
  59                 seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
  60                 goto out;
  61         }
  62
  63         if (alg->cra_type && alg->cra_type->show) {
  64                 alg->cra_type->show(m, alg);
  65                 goto out;
  66         }
  67
  68         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
  69         case CRYPTO_ALG_TYPE_CIPHER:
  70                 seq_printf(m, "type         : cipher\n");
  71                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  72                 seq_printf(m, "min keysize  : %u\n",
  73                                         alg->cra_cipher.cia_min_keysize);
  74                 seq_printf(m, "max keysize  : %u\n",
  75                                         alg->cra_cipher.cia_max_keysize);
  76                 break;
  77         case CRYPTO_ALG_TYPE_COMPRESS:
  78                 seq_printf(m, "type         : compression\n");
  79                 break;
  80         default:
  81                 seq_printf(m, "type         : unknown\n");
  82                 break;
  83         }
  84
  85 out:
  86         seq_putc(m, '\n');
  87         return 0;
  88 }
  89
  90 static const struct seq_operations crypto_seq_ops = {
  91         .start          = c_start,
  92         .next           = c_next,
  93         .stop           = c_stop,
  94         .show           = c_show
  95 };
  96
  97 static int crypto_info_open(struct inode *inode, struct file *file)
  98 {
  99         return seq_open(file, &crypto_seq_ops);
 100 }
 101
 102 static const struct file_operations proc_crypto_ops = {
 103         .open           = crypto_info_open,
 104         .read           = seq_read,
 105         .llseek         = seq_lseek,
 106         .release        = seq_release
 107 };
 108
 109 void __init crypto_init_proc(void)
 110 {
 111         proc_create("crypto", 0, NULL, &proc_crypto_ops);
 112 }
 113
 114 void __exit crypto_exit_proc(void)
 115 {
 116         remove_proc_entry("crypto", NULL);
 117 }