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/module.h>       /* for module_name() */
  15 #include <linux/rwsem.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/seq_file.h>
  18 #include "internal.h"
  19
  20 static void *c_start(struct seq_file *m, loff_t *pos)
  21 {
  22         down_read(&crypto_alg_sem);
  23         return seq_list_start(&crypto_alg_list, *pos);
  24 }
  25
  26 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
  27 {
  28         return seq_list_next(p, &crypto_alg_list, pos);
  29 }
  30
  31 static void c_stop(struct seq_file *m, void *p)
  32 {
  33         up_read(&crypto_alg_sem);
  34 }
  35
  36 static int c_show(struct seq_file *m, void *p)
  37 {
  38         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
  39
  40         seq_printf(m, "name         : %s\n", alg->cra_name);
  41         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
  42         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
  43         seq_printf(m, "priority     : %d\n", alg->cra_priority);
  44         seq_printf(m, "refcnt       : %u\n", refcount_read(&alg->cra_refcnt));
  45         seq_printf(m, "selftest     : %s\n",
  46                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
  47                    "passed" : "unknown");
  48         seq_printf(m, "internal     : %s\n",
  49                    (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
  50                    "yes" : "no");
  51
  52         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  53                 seq_printf(m, "type         : larval\n");
  54                 seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
  55                 goto out;
  56         }
  57
  58         if (alg->cra_type && alg->cra_type->show) {
  59                 alg->cra_type->show(m, alg);
  60                 goto out;
  61         }
  62
  63         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
  64         case CRYPTO_ALG_TYPE_CIPHER:
  65                 seq_printf(m, "type         : cipher\n");
  66                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  67                 seq_printf(m, "min keysize  : %u\n",
  68                                         alg->cra_cipher.cia_min_keysize);
  69                 seq_printf(m, "max keysize  : %u\n",
  70                                         alg->cra_cipher.cia_max_keysize);
  71                 break;
  72         case CRYPTO_ALG_TYPE_COMPRESS:
  73                 seq_printf(m, "type         : compression\n");
  74                 break;
  75         default:
  76                 seq_printf(m, "type         : unknown\n");
  77                 break;
  78         }
  79
  80 out:
  81         seq_putc(m, '\n');
  82         return 0;
  83 }
  84
  85 static const struct seq_operations crypto_seq_ops = {
  86         .start          = c_start,
  87         .next           = c_next,
  88         .stop           = c_stop,
  89         .show           = c_show
  90 };
  91
  92 void __init crypto_init_proc(void)
  93 {
  94         proc_create_seq("crypto", 0, NULL, &crypto_seq_ops);
  95 }
  96
  97 void __exit crypto_exit_proc(void)
  98 {
  99         remove_proc_entry("crypto", NULL);
 100 }