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