LXR linux/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 <linux/sysctl.h>
  23#include "internal.h"
  24
  25#ifdef CONFIG_CRYPTO_FIPS
  26static struct ctl_table crypto_sysctl_table[] = {
  27        {
  28                .procname       = "fips_enabled",
  29                .data           = &fips_enabled,
  30                .maxlen         = sizeof(int),
  31                .mode           = 0444,
  32                .proc_handler   = proc_dointvec
  33        },
  34        {}
  35};
  36
  37static struct ctl_table crypto_dir_table[] = {
  38        {
  39                .procname       = "crypto",
  40                .mode           = 0555,
  41                .child          = crypto_sysctl_table
  42        },
  43        {}
  44};
  45
  46static struct ctl_table_header *crypto_sysctls;
  47
  48static void crypto_proc_fips_init(void)
  49{
  50        crypto_sysctls = register_sysctl_table(crypto_dir_table);
  51}
  52
  53static void crypto_proc_fips_exit(void)
  54{
  55        if (crypto_sysctls)
  56                unregister_sysctl_table(crypto_sysctls);
  57}
  58#else
  59#define crypto_proc_fips_init()
  60#define crypto_proc_fips_exit()
  61#endif
  62
  63static void *c_start(struct seq_file *m, loff_t *pos)
  64{
  65        down_read(&crypto_alg_sem);
  66        return seq_list_start(&crypto_alg_list, *pos);
  67}
  68
  69static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  70{
  71        return seq_list_next(p, &crypto_alg_list, pos);
  72}
  73
  74static void c_stop(struct seq_file *m, void *p)
  75{
  76        up_read(&crypto_alg_sem);
  77}
  78
  79static int c_show(struct seq_file *m, void *p)
  80{
  81        struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  82        
  83        seq_printf(m, "name         : %s\n", alg->cra_name);
  84        seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  85        seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  86        seq_printf(m, "priority     : %d\n", alg->cra_priority);
  87        seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  88        seq_printf(m, "selftest     : %s\n",
  89                   (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  90                   "passed" : "unknown");
  91
  92        if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  93                seq_printf(m, "type         : larval\n");
  94                seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
  95                goto out;
  96        }
  97
  98        if (alg->cra_type && alg->cra_type->show) {
  99                alg->cra_type->show(m, alg);
 100                goto out;
 101        }
 102        
 103        switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
 104        case CRYPTO_ALG_TYPE_CIPHER:
 105                seq_printf(m, "type         : cipher\n");
 106                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 107                seq_printf(m, "min keysize  : %u\n",
 108                                        alg->cra_cipher.cia_min_keysize);
 109                seq_printf(m, "max keysize  : %u\n",
 110                                        alg->cra_cipher.cia_max_keysize);
 111                break;
 112        case CRYPTO_ALG_TYPE_COMPRESS:
 113                seq_printf(m, "type         : compression\n");
 114                break;
 115        default:
 116                seq_printf(m, "type         : unknown\n");
 117                break;
 118        }
 119
 120out:
 121        seq_putc(m, '\n');
 122        return 0;
 123}
 124
 125static const struct seq_operations crypto_seq_ops = {
 126        .start          = c_start,
 127        .next           = c_next,
 128        .stop           = c_stop,
 129        .show           = c_show
 130};
 131
 132static int crypto_info_open(struct inode *inode, struct file *file)
 133{
 134        return seq_open(file, &crypto_seq_ops);
 135}
 136        
 137static const struct file_operations proc_crypto_ops = {
 138        .open           = crypto_info_open,
 139        .read           = seq_read,
 140        .llseek         = seq_lseek,
 141        .release        = seq_release
 142};
 143
 144void __init crypto_init_proc(void)
 145{
 146        proc_create("crypto", 0, NULL, &proc_crypto_ops);
 147        crypto_proc_fips_init();
 148}
 149
 150void __exit crypto_exit_proc(void)
 151{
 152        crypto_proc_fips_exit();
 153        remove_proc_entry("crypto", NULL);
 154}
 155