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TOMOYO Linux Cross Reference
Linux/crypto/proc.c

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  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 <asm/atomic.h>
 17 #include <linux/init.h>
 18 #include <linux/crypto.h>
 19 #include <linux/rwsem.h>
 20 #include <linux/proc_fs.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/sysctl.h>
 23 #include "internal.h"
 24 
 25 #ifdef CONFIG_CRYPTO_FIPS
 26 static struct ctl_table crypto_sysctl_table[] = {
 27         {
 28                 .procname       = "fips_enabled",
 29                 .data           = &fips_enabled,
 30                 .maxlen         = sizeof(int),
 31                 .mode           = 0444,
 32                 .proc_handler   = proc_dointvec
 33         },
 34         {}
 35 };
 36 
 37 static struct ctl_table crypto_dir_table[] = {
 38         {
 39                 .procname       = "crypto",
 40                 .mode           = 0555,
 41                 .child          = crypto_sysctl_table
 42         },
 43         {}
 44 };
 45 
 46 static struct ctl_table_header *crypto_sysctls;
 47 
 48 static void crypto_proc_fips_init(void)
 49 {
 50         crypto_sysctls = register_sysctl_table(crypto_dir_table);
 51 }
 52 
 53 static void crypto_proc_fips_exit(void)
 54 {
 55         if (crypto_sysctls)
 56                 unregister_sysctl_table(crypto_sysctls);
 57 }
 58 #else
 59 #define crypto_proc_fips_init()
 60 #define crypto_proc_fips_exit()
 61 #endif
 62 
 63 static void *c_start(struct seq_file *m, loff_t *pos)
 64 {
 65         down_read(&crypto_alg_sem);
 66         return seq_list_start(&crypto_alg_list, *pos);
 67 }
 68 
 69 static void *c_next(struct seq_file *m, void *p, loff_t *pos)
 70 {
 71         return seq_list_next(p, &crypto_alg_list, pos);
 72 }
 73 
 74 static void c_stop(struct seq_file *m, void *p)
 75 {
 76         up_read(&crypto_alg_sem);
 77 }
 78 
 79 static int c_show(struct seq_file *m, void *p)
 80 {
 81         struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list);
 82         
 83         seq_printf(m, "name         : %s\n", alg->cra_name);
 84         seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
 85         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
 86         seq_printf(m, "priority     : %d\n", alg->cra_priority);
 87         seq_printf(m, "refcnt       : %d\n", atomic_read(&alg->cra_refcnt));
 88         seq_printf(m, "selftest     : %s\n",
 89                    (alg->cra_flags & CRYPTO_ALG_TESTED) ?
 90                    "passed" : "unknown");
 91 
 92         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
 93                 seq_printf(m, "type         : larval\n");
 94                 seq_printf(m, "flags        : 0x%x\n", alg->cra_flags);
 95                 goto out;
 96         }
 97 
 98         if (alg->cra_type && alg->cra_type->show) {
 99                 alg->cra_type->show(m, alg);
100                 goto out;
101         }
102         
103         switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
104         case CRYPTO_ALG_TYPE_CIPHER:
105                 seq_printf(m, "type         : cipher\n");
106                 seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
107                 seq_printf(m, "min keysize  : %u\n",
108                                         alg->cra_cipher.cia_min_keysize);
109                 seq_printf(m, "max keysize  : %u\n",
110                                         alg->cra_cipher.cia_max_keysize);
111                 break;
112         case CRYPTO_ALG_TYPE_COMPRESS:
113                 seq_printf(m, "type         : compression\n");
114                 break;
115         default:
116                 seq_printf(m, "type         : unknown\n");
117                 break;
118         }
119 
120 out:
121         seq_putc(m, '\n');
122         return 0;
123 }
124 
125 static const struct seq_operations crypto_seq_ops = {
126         .start          = c_start,
127         .next           = c_next,
128         .stop           = c_stop,
129         .show           = c_show
130 };
131 
132 static int crypto_info_open(struct inode *inode, struct file *file)
133 {
134         return seq_open(file, &crypto_seq_ops);
135 }
136         
137 static const struct file_operations proc_crypto_ops = {
138         .open           = crypto_info_open,
139         .read           = seq_read,
140         .llseek         = seq_lseek,
141         .release        = seq_release
142 };
143 
144 void __init crypto_init_proc(void)
145 {
146         proc_create("crypto", 0, NULL, &proc_crypto_ops);
147         crypto_proc_fips_init();
148 }
149 
150 void __exit crypto_exit_proc(void)
151 {
152         crypto_proc_fips_exit();
153         remove_proc_entry("crypto", NULL);
154 }
155 

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