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
  27 static 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
  38 static struct ctl_table crypto_dir_table[] = {
  39         {
  40                 .procname       = "crypto",
  41                 .mode           = 0555,
  42                 .child          = crypto_sysctl_table
  43         },
  44         {}
  45 };
  46
  47 static struct ctl_table_header *crypto_sysctls;
  48
  49 static void crypto_proc_fips_init(void)
  50 {
  51         crypto_sysctls = register_sysctl_table(crypto_dir_table);
  52 }
  53
  54 static 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
  64 static 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
  70 static 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
  75 static void c_stop(struct seq_file *m, void *p)
  76 {
  77         up_read(&crypto_alg_sem);
  78 }
  79
  80 static 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
 121 out:
 122         seq_putc(m, '\n');
 123         return 0;
 124 }
 125
 126 static 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
 133 static int crypto_info_open(struct inode *inode, struct file *file)
 134 {
 135         return seq_open(file, &crypto_seq_ops);
 136 }
 137
 138 static 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
 145 void __init crypto_init_proc(void)
 146 {
 147         proc_create("crypto", 0, NULL, &proc_crypto_ops);
 148         crypto_proc_fips_init();
 149 }
 150
 151 void __exit crypto_exit_proc(void)
 152 {
 153         crypto_proc_fips_exit();
 154         remove_proc_entry("crypto", NULL);
 155 }