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
  26 static struct ctl_table crypto_sysctl_table[] = {
  27         {
  28                 .ctl_name       = CTL_UNNUMBERED,
  29                 .procname       = "fips_enabled",
  30                 .data           = &fips_enabled,
  31                 .maxlen         = sizeof(int),
  32                 .mode           = 0444,
  33                 .proc_handler   = &proc_dointvec
  34         },
  35         {
  36                 .ctl_name = 0,
  37         },
  38 };
  39
  40 static struct ctl_table crypto_dir_table[] = {
  41         {
  42                 .ctl_name       = CTL_UNNUMBERED,
  43                 .procname       = "crypto",
  44                 .mode           = 0555,
  45                 .child          = crypto_sysctl_table
  46         },
  47         {
  48                 .ctl_name = 0,
  49         },
  50 };
  51
  52 static struct ctl_table_header *crypto_sysctls;
  53
  54 static void crypto_proc_fips_init(void)
  55 {
  56         crypto_sysctls = register_sysctl_table(crypto_dir_table);
  57 }
  58
  59 static void crypto_proc_fips_exit(void)
  60 {
  61         if (crypto_sysctls)
  62                 unregister_sysctl_table(crypto_sysctls);
  63 }
  64 #else
  65 #define crypto_proc_fips_init()
  66 #define crypto_proc_fips_exit()
  67 #endif
  68
  69 static void *c_start(struct seq_file *m, loff_t *pos)
  70 {
  71         down_read(&crypto_alg_sem);
  72         return seq_list_start(&crypto_alg_list, *pos);
  73 }
  74
  75 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  76 {
  77         return seq_list_next(p, &crypto_alg_list, pos);
  78 }
  79
  80 static void c_stop(struct seq_file *m, void *p)
  81 {
  82         up_read(&crypto_alg_sem);
  83 }
  84
  85 static int c_show(struct seq_file *m, void *p)
  86 {
  87         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  88
  89         seq_printf(m, "name         : %s\n", alg->cra_name);
  90         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  91         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  92         seq_printf(m, "priority     : %d\n", alg->cra_priority);
  93         seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
  94         seq_printf(m, "selftest     : %s\n",
  95                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  96                    "passed" : "unknown");
  97
  98         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
  99         case CRYPTO_ALG_TYPE_CIPHER:
 100                 seq_printf(m, "type         : cipher\n");
 101                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 102                 seq_printf(m, "min keysize  : %u\n",
 103                                         alg->cra_cipher.cia_min_keysize);
 104                 seq_printf(m, "max keysize  : %u\n",
 105                                         alg->cra_cipher.cia_max_keysize);
 106                 break;
 107
 108         case CRYPTO_ALG_TYPE_DIGEST:
 109                 seq_printf(m, "type         : digest\n");
 110                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 111                 seq_printf(m, "digestsize   : %u\n",
 112                            alg->cra_digest.dia_digestsize);
 113                 break;
 114         case CRYPTO_ALG_TYPE_COMPRESS:
 115                 seq_printf(m, "type         : compression\n");
 116                 break;
 117         default:
 118                 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
 119                         seq_printf(m, "type         : larval\n");
 120                         seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
 121                 } else if (alg->cra_type && alg->cra_type->show)
 122                         alg->cra_type->show(m, alg);
 123                 else
 124                         seq_printf(m, "type         : unknown\n");
 125                 break;
 126         }
 127
 128         seq_putc(m, '\n');
 129         return 0;
 130 }
 131
 132 static const struct seq_operations crypto_seq_ops = {
 133         .start          = c_start,
 134         .next           = c_next,
 135         .stop           = c_stop,
 136         .show           = c_show
 137 };
 138
 139 static int crypto_info_open(struct inode *inode, struct file *file)
 140 {
 141         return seq_open(file, &crypto_seq_ops);
 142 }
 143
 144 static const struct file_operations proc_crypto_ops = {
 145         .open           = crypto_info_open,
 146         .read           = seq_read,
 147         .llseek         = seq_lseek,
 148         .release        = seq_release
 149 };
 150
 151 void __init crypto_init_proc(void)
 152 {
 153         proc_create("crypto", 0, NULL, &proc_crypto_ops);
 154         crypto_proc_fips_init();
 155 }
 156
 157 void __exit crypto_exit_proc(void)
 158 {
 159         crypto_proc_fips_exit();
 160         remove_proc_entry("crypto", NULL);
 161 }