proc.c

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/*
 * Scatterlist Cryptographic API.
 *
 * Procfs information.
 *
 * Copyright (c) 2002 James Morris <[email protected]>
 * Copyright (c) 2005 Herbert Xu <[email protected]>
 *
 * 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/atomic.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/module.h>   /* for module_name() */
#include <linux/rwsem.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysctl.h>
#include "internal.h"

#ifdef CONFIG_CRYPTO_FIPS
static struct ctl_table crypto_sysctl_table[] = {
    {
        .procname       = "fips_enabled",
        .data           = &fips_enabled,
        .maxlen         = sizeof(int),
        .mode           = 0444,
        .proc_handler   = proc_dointvec
    },
    {}
};

static struct ctl_table crypto_dir_table[] = {
    {
        .procname       = "crypto",
        .mode           = 0555,
        .child          = crypto_sysctl_table
    },
    {}
};

static struct ctl_table_header *crypto_sysctls;

static void crypto_proc_fips_init(void)
{
    crypto_sysctls = register_sysctl_table(crypto_dir_table);
}

static void crypto_proc_fips_exit(void)
{
    if (crypto_sysctls)
        unregister_sysctl_table(crypto_sysctls);
}
#else
#define crypto_proc_fips_init()
#define crypto_proc_fips_exit()
#endif

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));
    seq_printf(m, "selftest     : %s\n",
           (alg->cra_flags & CRYPTO_ALG_TESTED) ?
           "passed" : "unknown");

    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 | CRYPTO_ALG_LARVAL)) {
    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_COMPRESS:
        seq_printf(m, "type         : compression\n");
        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
};

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)
{
    proc_create("crypto", 0, NULL, &proc_crypto_ops);
    crypto_proc_fips_init();
}

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