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 <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 <linux/sysctl.h>
  24#include "internal.h"
  25
  26#ifdef CONFIG_CRYPTO_FIPS
  27static struct ctl_table crypto_sysctl_table[] = {
  28        {
  29                .procname       = "fips_enabled",
  30                .data           = &fips_enabled,
  31                .maxlen         = sizeof(int),
  32                .mode           = 0444,
  33                .proc_handler   = proc_dointvec
  34        },
  35        {}
  36};
  37
  38static struct ctl_table crypto_dir_table[] = {
  39        {
  40                .procname       = "crypto",
  41                .mode           = 0555,
  42                .child          = crypto_sysctl_table
  43        },
  44        {}
  45};
  46
  47static struct ctl_table_header *crypto_sysctls;
  48
  49static void crypto_proc_fips_init(void)
  50{
  51        crypto_sysctls = register_sysctl_table(crypto_dir_table);
  52}
  53
  54static void crypto_proc_fips_exit(void)
  55{
  56        if (crypto_sysctls)
  57                unregister_sysctl_table(crypto_sysctls);
  58}
  59#else
  60#define crypto_proc_fips_init()
  61#define crypto_proc_fips_exit()
  62#endif
  63
  64static void *c_start(struct seq_file *m, loff_t *pos)
  65{
  66        down_read(&crypto_alg_sem);
  67        return seq_list_start(&crypto_alg_list, *pos);
  68}
  69
  70static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  71{
  72        return seq_list_next(p, &crypto_alg_list, pos);
  73}
  74
  75static void c_stop(struct seq_file *m, void *p)
  76{
  77        up_read(&crypto_alg_sem);
  78}
  79
  80static int c_show(struct seq_file *m, void *p)
  81{
  82        struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  83        
  84        seq_printf(m, "name         : %s\n", alg->cra_name);
  85        seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  86        seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  87        seq_printf(m, "priority     : %d\n", alg->cra_priority);
  88        seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  89        seq_printf(m, "selftest     : %s\n",
  90                   (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  91                   "passed" : "unknown");
  92
  93        if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  94                seq_printf(m, "type         : larval\n");
  95                seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
  96                goto out;
  97        }
  98
  99        if (alg->cra_type && alg->cra_type->show) {
 100                alg->cra_type->show(m, alg);
 101                goto out;
 102        }
 103        
 104        switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
 105        case CRYPTO_ALG_TYPE_CIPHER:
 106                seq_printf(m, "type         : cipher\n");
 107                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 108                seq_printf(m, "min keysize  : %u\n",
 109                                        alg->cra_cipher.cia_min_keysize);
 110                seq_printf(m, "max keysize  : %u\n",
 111                                        alg->cra_cipher.cia_max_keysize);
 112                break;
 113        case CRYPTO_ALG_TYPE_COMPRESS:
 114                seq_printf(m, "type         : compression\n");
 115                break;
 116        default:
 117                seq_printf(m, "type         : unknown\n");
 118                break;
 119        }
 120
 121out:
 122        seq_putc(m, '\n');
 123        return 0;
 124}
 125
 126static const struct seq_operations crypto_seq_ops = {
 127        .start          = c_start,
 128        .next           = c_next,
 129        .stop           = c_stop,
 130        .show           = c_show
 131};
 132
 133static int crypto_info_open(struct inode *inode, struct file *file)
 134{
 135        return seq_open(file, &crypto_seq_ops);
 136}
 137        
 138static const struct file_operations proc_crypto_ops = {
 139        .open           = crypto_info_open,
 140        .read           = seq_read,
 141        .llseek         = seq_lseek,
 142        .release        = seq_release
 143};
 144
 145void __init crypto_init_proc(void)
 146{
 147        proc_create("crypto", 0, NULL, &proc_crypto_ops);
 148        crypto_proc_fips_init();
 149}
 150
 151void __exit crypto_exit_proc(void)
 152{
 153        crypto_proc_fips_exit();
 154        remove_proc_entry("crypto", NULL);
 155}
 156