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proc.c

/*
 * Scatterlist Cryptographic API.
 *
 * Procfs information.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version.
 *
 */

#include <asm/atomic.h>
#include <linux/init.h>
#include <linux/crypto.h>
#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       : %d\n", atomic_read(&alg->cra_refcnt));
      
      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;
            
      case CRYPTO_ALG_TYPE_DIGEST:
            seq_printf(m, "type         : digest\n");
            seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
            seq_printf(m, "digestsize   : %u\n",
                       alg->cra_digest.dia_digestsize);
            break;
      case CRYPTO_ALG_TYPE_COMPRESS:
            seq_printf(m, "type         : compression\n");
            break;
      default:
            if (alg->cra_type && alg->cra_type->show)
                  alg->cra_type->show(m, alg);
            else
                  seq_printf(m, "type         : unknown\n");
            break;
      }

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

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

static int crypto_info_open(struct inode *inode, struct file *file)
{
      return seq_open(file, &crypto_seq_ops);
}
        
static const struct file_operations proc_crypto_ops = {
      .open       = crypto_info_open,
      .read       = seq_read,
      .llseek           = seq_lseek,
      .release    = seq_release
};

void __init crypto_init_proc(void)
{
      struct proc_dir_entry *proc;
      
      proc = create_proc_entry("crypto", 0, NULL);
      if (proc)
            proc->proc_fops = &proc_crypto_ops;
}

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

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