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 .ctl_name = CTL_UNNUMBERED, 29 .procname = "fips_enabled", 30 .data = &fips_enabled, 31 .maxlen = sizeof(int), 32 .mode = 0444, 33 .proc_handler = &proc_dointvec 34 }, 35 { 36 .ctl_name = 0, 37 }, 38 }; 39 40 static struct ctl_table crypto_dir_table[] = { 41 { 42 .ctl_name = CTL_UNNUMBERED, 43 .procname = "crypto", 44 .mode = 0555, 45 .child = crypto_sysctl_table 46 }, 47 { 48 .ctl_name = 0, 49 }, 50 }; 51 52 static struct ctl_table_header *crypto_sysctls; 53 54 static void crypto_proc_fips_init(void) 55 { 56 crypto_sysctls = register_sysctl_table(crypto_dir_table); 57 } 58 59 static void crypto_proc_fips_exit(void) 60 { 61 if (crypto_sysctls) 62 unregister_sysctl_table(crypto_sysctls); 63 } 64 #else 65 #define crypto_proc_fips_init() 66 #define crypto_proc_fips_exit() 67 #endif 68 69 static void *c_start(struct seq_file *m, loff_t *pos) 70 { 71 down_read(&crypto_alg_sem); 72 return seq_list_start(&crypto_alg_list, *pos); 73 } 74 75 static void *c_next(struct seq_file *m, void *p, loff_t *pos) 76 { 77 return seq_list_next(p, &crypto_alg_list, pos); 78 } 79 80 static void c_stop(struct seq_file *m, void *p) 81 { 82 up_read(&crypto_alg_sem); 83 } 84 85 static int c_show(struct seq_file *m, void *p) 86 { 87 struct crypto_alg *alg = list_entry(p, struct crypto_alg, cra_list); 88 89 seq_printf(m, "name : %s\n", alg->cra_name); 90 seq_printf(m, "driver : %s\n", alg->cra_driver_name); 91 seq_printf(m, "module : %s\n", module_name(alg->cra_module)); 92 seq_printf(m, "priority : %d\n", alg->cra_priority); 93 seq_printf(m, "refcnt : %d\n", atomic_read(&alg->cra_refcnt)); 94 seq_printf(m, "selftest : %s\n", 95 (alg->cra_flags & CRYPTO_ALG_TESTED) ? 96 "passed" : "unknown"); 97 98 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { 99 case CRYPTO_ALG_TYPE_CIPHER: 100 seq_printf(m, "type : cipher\n"); 101 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 102 seq_printf(m, "min keysize : %u\n", 103 alg->cra_cipher.cia_min_keysize); 104 seq_printf(m, "max keysize : %u\n", 105 alg->cra_cipher.cia_max_keysize); 106 break; 107 108 case CRYPTO_ALG_TYPE_DIGEST: 109 seq_printf(m, "type : digest\n"); 110 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 111 seq_printf(m, "digestsize : %u\n", 112 alg->cra_digest.dia_digestsize); 113 break; 114 case CRYPTO_ALG_TYPE_COMPRESS: 115 seq_printf(m, "type : compression\n"); 116 break; 117 default: 118 if (alg->cra_flags & CRYPTO_ALG_LARVAL) { 119 seq_printf(m, "type : larval\n"); 120 seq_printf(m, "flags : 0x%x\n", alg->cra_flags); 121 } else if (alg->cra_type && alg->cra_type->show) 122 alg->cra_type->show(m, alg); 123 else 124 seq_printf(m, "type : unknown\n"); 125 break; 126 } 127 128 seq_putc(m, '\n'); 129 return 0; 130 } 131 132 static const struct seq_operations crypto_seq_ops = { 133 .start = c_start, 134 .next = c_next, 135 .stop = c_stop, 136 .show = c_show 137 }; 138 139 static int crypto_info_open(struct inode *inode, struct file *file) 140 { 141 return seq_open(file, &crypto_seq_ops); 142 } 143 144 static const struct file_operations proc_crypto_ops = { 145 .open = crypto_info_open, 146 .read = seq_read, 147 .llseek = seq_lseek, 148 .release = seq_release 149 }; 150 151 void __init crypto_init_proc(void) 152 { 153 proc_create("crypto", 0, NULL, &proc_crypto_ops); 154 crypto_proc_fips_init(); 155 } 156 157 void __exit crypto_exit_proc(void) 158 { 159 crypto_proc_fips_exit(); 160 remove_proc_entry("crypto", NULL); 161 } 162