Quelle proc.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Scatterlist Cryptographic API.
*
* Procfs information.
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
*/

#include <linux/atomic.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/fips.h>
#include <linux/module.h> /* for module_name() */
#include <linux/rwsem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include "internal.h"

static void *c_start(struct seq_file *m, loff_t *pos)
{
down_read(&crypto_alg_sem);
return seq_list_start(&crypto_alg_list, *pos);
}

static void *c_next(struct seq_file *m, void *p, loff_t *pos)
{
return seq_list_next(p, &crypto_alg_list, pos);
}

static void c_stop(struct seq_file *m, void *p)
{
up_read(&crypto_alg_sem);
}

static int c_show(struct seq_file *m, void *p)
{
struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);

seq_printf(m, "name : %s\n", alg->cra_name);
seq_printf(m, "driver : %s\n", alg->cra_driver_name);
seq_printf(m, "module : %s\n", module_name(alg->cra_module));
seq_printf(m, "priority : %d\n", alg->cra_priority);
seq_printf(m, "refcnt : %u\n", refcount_read(&alg->cra_refcnt));
seq_printf(m, "selftest : %s\n",
     (alg->cra_flags & CRYPTO_ALG_TESTED) ?
     "passed" : "unknown");
seq_printf(m, "internal : %s\n",
     str_yes_no(alg->cra_flags & CRYPTO_ALG_INTERNAL));
if (fips_enabled)
  seq_printf(m, "fips : %s\n",
   str_no_yes(alg->cra_flags & CRYPTO_ALG_FIPS_INTERNAL));

if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
  seq_printf(m, "type : larval\n");
  seq_printf(m, "flags : 0x%x\n", alg->cra_flags);
  goto out;
}

if (alg->cra_type && alg->cra_type->show) {
  alg->cra_type->show(m, alg);
  goto out;
}

switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_CIPHER:
  seq_printf(m, "type : cipher\n");
  seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
  seq_printf(m, "min keysize : %u\n",
     alg->cra_cipher.cia_min_keysize);
  seq_printf(m, "max keysize : %u\n",
     alg->cra_cipher.cia_max_keysize);
  break;
default:
  seq_printf(m, "type : unknown\n");
  break;
}

out:
seq_putc(m, '\n');
return 0;
}

static const struct seq_operations crypto_seq_ops = {
.start  = c_start,
.next  = c_next,
.stop  = c_stop,
.show  = c_show
};

void __init crypto_init_proc(void)
{
proc_create_seq("crypto", 0, NULL, &crypto_seq_ops);
}

void __exit crypto_exit_proc(void)
{
remove_proc_entry("crypto", NULL);
}

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