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/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                 .procname       = "fips_enabled",
  29                 .data           = &fips_enabled,
  30                 .maxlen         = sizeof(int),
  31                 .mode           = 0444,
  32                 .proc_handler   = proc_dointvec
  33         },
  34         {}
  35 };
  36
  37 static struct ctl_table crypto_dir_table[] = {
  38         {
  39                 .procname       = "crypto",
  40                 .mode           = 0555,
  41                 .child          = crypto_sysctl_table
  42         },
  43         {}
  44 };
  45
  46 static struct ctl_table_header *crypto_sysctls;
  47
  48 static void crypto_proc_fips_init(void)
  49 {
  50         crypto_sysctls = register_sysctl_table(crypto_dir_table);
  51 }
  52
  53 static 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
  63 static 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
  69 static 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
  74 static void c_stop(struct seq_file *m, void *p)
  75 {
  76         up_read(&crypto_alg_sem);
  77 }
  78
  79 static 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
 120 out:
 121         seq_putc(m, '\n');
 122         return 0;
 123 }
 124
 125 static 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
 132 static int crypto_info_open(struct inode *inode, struct file *file)
 133 {
 134         return seq_open(file, &crypto_seq_ops);
 135 }
 136
 137 static 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
 144 void __init crypto_init_proc(void)
 145 {
 146         proc_create("crypto", 0, NULL, &proc_crypto_ops);
 147         crypto_proc_fips_init();
 148 }
 149
 150 void __exit crypto_exit_proc(void)
 151 {
 152         crypto_proc_fips_exit();
 153         remove_proc_entry("crypto", NULL);
 154 }