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/*
 * Scatterlist Cryptographic API.
 *
 * Procfs information.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.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 <linux/init.h>
#include <linux/crypto.h>
#include <linux/rwsem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include "internal.h"
 
extern struct list_head crypto_alg_list;
extern struct rw_semaphore crypto_alg_sem;
 
static void *c_start(struct seq_file *m, loff_t *pos)
{
	struct list_head *v;
	loff_t n = *pos;
 
	down_read(&crypto_alg_sem);
	list_for_each(v, &crypto_alg_list)
		if (!n--)
			return list_entry(v, struct crypto_alg, cra_list);
	return NULL;
}
 
static void *c_next(struct seq_file *m, void *p, loff_t *pos)
{
	struct list_head *v = p;
 
	(*pos)++;
	v = v->next;
	return (v == &crypto_alg_list) ?
		NULL : list_entry(v, struct crypto_alg, cra_list);
}
 
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 = (struct crypto_alg *)p;
 
	seq_printf(m, "name         : %s\n", alg->cra_name);
	seq_printf(m, "module       : %s\n",
		   (alg->cra_module ?
		    alg->cra_module->name :
		    "kernel"));
 
	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:
		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 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;
}