linux/crypto/proc.c
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   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
  20static 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
  26static 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
  31static void c_stop(struct seq_file *m, void *p)
  32{
  33        up_read(&crypto_alg_sem);
  34}
  35
  36static 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) {
  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
  80out:
  81        seq_putc(m, '\n');
  82        return 0;
  83}
  84
  85static 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
  92void __init crypto_init_proc(void)
  93{
  94        proc_create_seq("crypto", 0, NULL, &crypto_seq_ops);
  95}
  96
  97void __exit crypto_exit_proc(void)
  98{
  99        remove_proc_entry("crypto", NULL);
 100}
 101
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