crypto/proc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Scatterlist Cryptographic API.
   4  *
   5  * Procfs information.
   6  *
   7  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   8  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
   9  */
  10
  11 #include <linux/atomic.h>
  12 #include <linux/init.h>
  13 #include <linux/crypto.h>
  14 #include <linux/fips.h>
  15 #include <linux/module.h>       /* for module_name() */
  16 #include <linux/rwsem.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/seq_file.h>
  19 #include "internal.h"
  20
  21 static void *c_start(struct seq_file *m, loff_t *pos)
  22 {
  23         down_read(&crypto_alg_sem);
  24         return seq_list_start(&crypto_alg_list, *pos);
  25 }
  26
  27 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  28 {
  29         return seq_list_next(p, &crypto_alg_list, pos);
  30 }
  31
  32 static void c_stop(struct seq_file *m, void *p)
  33 {
  34         up_read(&crypto_alg_sem);
  35 }
  36
  37 static int c_show(struct seq_file *m, void *p)
  38 {
  39         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  40
  41         seq_printf(m, "name         : %s\n", alg->cra_name);
  42         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  43         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  44         seq_printf(m, "priority     : %d\n", alg->cra_priority);
  45         seq_printf(m, "refcnt       : %u\n", refcount_read(&alg->cra_refcnt));
  46         seq_printf(m, "selftest     : %s\n",
  47                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  48                    "passed" : "unknown");
  49         seq_printf(m, "internal     : %s\n",
  50                    (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
  51                    "yes" : "no");
  52         if (fips_enabled) {
  53                 seq_printf(m, "fips         : %s\n",
  54                            (alg->cra_flags & CRYPTO_ALG_FIPS_INTERNAL) ?
  55                            "no" : "yes");
  56         }
  57
  58         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  59                 seq_printf(m, "type         : larval\n");
  60                 seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
  61                 goto out;
  62         }
  63
  64         if (alg->cra_type && alg->cra_type->show) {
  65                 alg->cra_type->show(m, alg);
  66                 goto out;
  67         }
  68
  69         switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
  70         case CRYPTO_ALG_TYPE_CIPHER:
  71                 seq_printf(m, "type         : cipher\n");
  72                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  73                 seq_printf(m, "min keysize  : %u\n",
  74                                         alg->cra_cipher.cia_min_keysize);
  75                 seq_printf(m, "max keysize  : %u\n",
  76                                         alg->cra_cipher.cia_max_keysize);
  77                 break;
  78         case CRYPTO_ALG_TYPE_COMPRESS:
  79                 seq_printf(m, "type         : compression\n");
  80                 break;
  81         default:
  82                 seq_printf(m, "type         : unknown\n");
  83                 break;
  84         }
  85
  86 out:
  87         seq_putc(m, '\n');
  88         return 0;
  89 }
  90
  91 static const struct seq_operations crypto_seq_ops = {
  92         .start          = c_start,
  93         .next           = c_next,
  94         .stop           = c_stop,
  95         .show           = c_show
  96 };
  97
  98 void __init crypto_init_proc(void)
  99 {
 100         proc_create_seq("crypto", 0, NULL, &crypto_seq_ops);
 101 }
 102
 103 void __exit crypto_exit_proc(void)
 104 {
 105         remove_proc_entry("crypto", NULL);
 106 }