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 <linux/sysctl.h> 24 #include "internal.h" 25 26 #ifdef CONFIG_CRYPTO_FIPS 27 static struct ctl_table crypto_sysctl_table[] = { 28 { 29 .procname = "fips_enabled", 30 .data = &fips_enabled, 31 .maxlen = sizeof(int), 32 .mode = 0444, 33 .proc_handler = proc_dointvec 34 }, 35 {} 36 }; 37 38 static struct ctl_table crypto_dir_table[] = { 39 { 40 .procname = "crypto", 41 .mode = 0555, 42 .child = crypto_sysctl_table 43 }, 44 {} 45 }; 46 47 static struct ctl_table_header *crypto_sysctls; 48 49 static void crypto_proc_fips_init(void) 50 { 51 crypto_sysctls = register_sysctl_table(crypto_dir_table); 52 } 53 54 static void crypto_proc_fips_exit(void) 55 { 56 if (crypto_sysctls) 57 unregister_sysctl_table(crypto_sysctls); 58 } 59 #else 60 #define crypto_proc_fips_init() 61 #define crypto_proc_fips_exit() 62 #endif 63 64 static void *c_start(struct seq_file *m, loff_t *pos) 65 { 66 down_read(&crypto_alg_sem); 67 return seq_list_start(&crypto_alg_list, *pos); 68 } 69 70 static void *c_next(struct seq_file *m, void *p, loff_t *pos) 71 { 72 return seq_list_next(p, &crypto_alg_list, pos); 73 } 74 75 static void c_stop(struct seq_file *m, void *p) 76 { 77 up_read(&crypto_alg_sem); 78 } 79 80 static int c_show(struct seq_file *m, void *p) 81 { 82 struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list); 83 84 seq_printf(m, "name : %s\n", alg->cra_name); 85 seq_printf(m, "driver : %s\n", alg->cra_driver_name); 86 seq_printf(m, "module : %s\n", module_name(alg->cra_module)); 87 seq_printf(m, "priority : %d\n", alg->cra_priority); 88 seq_printf(m, "refcnt : %d\n", atomic_read(&alg->cra_refcnt)); 89 seq_printf(m, "selftest : %s\n", 90 (alg->cra_flags & CRYPTO_ALG_TESTED) ? 91 "passed" : "unknown"); 92 93 if (alg->cra_flags & CRYPTO_ALG_LARVAL) { 94 seq_printf(m, "type : larval\n"); 95 seq_printf(m, "flags : 0x%x\n", alg->cra_flags); 96 goto out; 97 } 98 99 if (alg->cra_type && alg->cra_type->show) { 100 alg->cra_type->show(m, alg); 101 goto out; 102 } 103 104 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { 105 case CRYPTO_ALG_TYPE_CIPHER: 106 seq_printf(m, "type : cipher\n"); 107 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 108 seq_printf(m, "min keysize : %u\n", 109 alg->cra_cipher.cia_min_keysize); 110 seq_printf(m, "max keysize : %u\n", 111 alg->cra_cipher.cia_max_keysize); 112 break; 113 case CRYPTO_ALG_TYPE_COMPRESS: 114 seq_printf(m, "type : compression\n"); 115 break; 116 default: 117 seq_printf(m, "type : unknown\n"); 118 break; 119 } 120 121 out: 122 seq_putc(m, '\n'); 123 return 0; 124 } 125 126 static const struct seq_operations crypto_seq_ops = { 127 .start = c_start, 128 .next = c_next, 129 .stop = c_stop, 130 .show = c_show 131 }; 132 133 static int crypto_info_open(struct inode *inode, struct file *file) 134 { 135 return seq_open(file, &crypto_seq_ops); 136 } 137 138 static const struct file_operations proc_crypto_ops = { 139 .open = crypto_info_open, 140 .read = seq_read, 141 .llseek = seq_lseek, 142 .release = seq_release 143 }; 144 145 void __init crypto_init_proc(void) 146 { 147 proc_create("crypto", 0, NULL, &proc_crypto_ops); 148 crypto_proc_fips_init(); 149 } 150 151 void __exit crypto_exit_proc(void) 152 { 153 crypto_proc_fips_exit(); 154 remove_proc_entry("crypto", NULL); 155 } 156