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Linux/crypto/proc.c

  1 /*
  2  * Scatterlist Cryptographic API.
  3  *
  4  * Procfs information.
  5  *
  6  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  7  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  8  *
  9  * This program is free software; you can redistribute it and/or modify it
 10  * under the terms of the GNU General Public License as published by the Free
 11  * Software Foundation; either version 2 of the License, or (at your option) 
 12  * any later version.
 13  *
 14  */
 15 
 16 #include <linux/atomic.h>
 17 #include <linux/init.h>
 18 #include <linux/crypto.h>
 19 #include <linux/module.h>       /* for module_name() */
 20 #include <linux/rwsem.h>
 21 #include <linux/proc_fs.h>
 22 #include <linux/seq_file.h>
 23 #include "internal.h"
 24 
 25 static void *c_start(struct seq_file *m, loff_t *pos)
 26 {
 27         down_read(&crypto_alg_sem);
 28         return seq_list_start(&crypto_alg_list, *pos);
 29 }
 30 
 31 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
 32 {
 33         return seq_list_next(p, &crypto_alg_list, pos);
 34 }
 35 
 36 static void c_stop(struct seq_file *m, void *p)
 37 {
 38         up_read(&crypto_alg_sem);
 39 }
 40 
 41 static int c_show(struct seq_file *m, void *p)
 42 {
 43         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
 44         
 45         seq_printf(m, "name         : %s\n", alg->cra_name);
 46         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
 47         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
 48         seq_printf(m, "priority     : %d\n", alg->cra_priority);
 49         seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
 50         seq_printf(m, "selftest     : %s\n",
 51                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
 52                    "passed" : "unknown");
 53         seq_printf(m, "internal     : %s\n",
 54                    (alg->cra_flags & CRYPTO_ALG_INTERNAL) ?
 55                    "yes" : "no");
 56 
 57         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
 58                 seq_printf(m, "type         : larval\n");
 59                 seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
 60                 goto out;
 61         }
 62 
 63         if (alg->cra_type && alg->cra_type->show) {
 64                 alg->cra_type->show(m, alg);
 65                 goto out;
 66         }
 67         
 68         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
 69         case CRYPTO_ALG_TYPE_CIPHER:
 70                 seq_printf(m, "type         : cipher\n");
 71                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 72                 seq_printf(m, "min keysize  : %u\n",
 73                                         alg->cra_cipher.cia_min_keysize);
 74                 seq_printf(m, "max keysize  : %u\n",
 75                                         alg->cra_cipher.cia_max_keysize);
 76                 break;
 77         case CRYPTO_ALG_TYPE_COMPRESS:
 78                 seq_printf(m, "type         : compression\n");
 79                 break;
 80         default:
 81                 seq_printf(m, "type         : unknown\n");
 82                 break;
 83         }
 84 
 85 out:
 86         seq_putc(m, '\n');
 87         return 0;
 88 }
 89 
 90 static const struct seq_operations crypto_seq_ops = {
 91         .start          = c_start,
 92         .next           = c_next,
 93         .stop           = c_stop,
 94         .show           = c_show
 95 };
 96 
 97 static int crypto_info_open(struct inode *inode, struct file *file)
 98 {
 99         return seq_open(file, &crypto_seq_ops);
100 }
101         
102 static const struct file_operations proc_crypto_ops = {
103         .open           = crypto_info_open,
104         .read           = seq_read,
105         .llseek         = seq_lseek,
106         .release        = seq_release
107 };
108 
109 void __init crypto_init_proc(void)
110 {
111         proc_create("crypto", 0, NULL, &proc_crypto_ops);
112 }
113 
114 void __exit crypto_exit_proc(void)
115 {
116         remove_proc_entry("crypto", NULL);
117 }
118 

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