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 "internal.h" 23 24 static void *c_start(struct seq_file *m, loff_t *pos) 25 { 26 struct list_head *v; 27 loff_t n = *pos; 28 29 down_read(&crypto_alg_sem); 30 list_for_each(v, &crypto_alg_list) 31 if (!n--) 32 return list_entry(v, struct crypto_alg, cra_list); 33 return NULL; 34 } 35 36 static void *c_next(struct seq_file *m, void *p, loff_t *pos) 37 { 38 struct list_head *v = p; 39 40 (*pos)++; 41 v = v->next; 42 return (v == &crypto_alg_list) ? 43 NULL : list_entry(v, struct crypto_alg, cra_list); 44 } 45 46 static void c_stop(struct seq_file *m, void *p) 47 { 48 up_read(&crypto_alg_sem); 49 } 50 51 static int c_show(struct seq_file *m, void *p) 52 { 53 struct crypto_alg *alg = (struct crypto_alg *)p; 54 55 seq_printf(m, "name : %s\n", alg->cra_name); 56 seq_printf(m, "driver : %s\n", alg->cra_driver_name); 57 seq_printf(m, "module : %s\n", module_name(alg->cra_module)); 58 seq_printf(m, "priority : %d\n", alg->cra_priority); 59 seq_printf(m, "refcnt : %d\n", atomic_read(&alg->cra_refcnt)); 60 61 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { 62 case CRYPTO_ALG_TYPE_CIPHER: 63 seq_printf(m, "type : cipher\n"); 64 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 65 seq_printf(m, "min keysize : %u\n", 66 alg->cra_cipher.cia_min_keysize); 67 seq_printf(m, "max keysize : %u\n", 68 alg->cra_cipher.cia_max_keysize); 69 break; 70 71 case CRYPTO_ALG_TYPE_DIGEST: 72 seq_printf(m, "type : digest\n"); 73 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 74 seq_printf(m, "digestsize : %u\n", 75 alg->cra_digest.dia_digestsize); 76 break; 77 case CRYPTO_ALG_TYPE_COMPRESS: 78 seq_printf(m, "type : compression\n"); 79 break; 80 default: 81 if (alg->cra_type && alg->cra_type->show) 82 alg->cra_type->show(m, alg); 83 else 84 seq_printf(m, "type : unknown\n"); 85 break; 86 } 87 88 seq_putc(m, '\n'); 89 return 0; 90 } 91 92 static struct seq_operations crypto_seq_ops = { 93 .start = c_start, 94 .next = c_next, 95 .stop = c_stop, 96 .show = c_show 97 }; 98 99 static int crypto_info_open(struct inode *inode, struct file *file) 100 { 101 return seq_open(file, &crypto_seq_ops); 102 } 103 104 static const struct file_operations proc_crypto_ops = { 105 .open = crypto_info_open, 106 .read = seq_read, 107 .llseek = seq_lseek, 108 .release = seq_release 109 }; 110 111 void __init crypto_init_proc(void) 112 { 113 struct proc_dir_entry *proc; 114 115 proc = create_proc_entry("crypto", 0, NULL); 116 if (proc) 117 proc->proc_fops = &proc_crypto_ops; 118 } 119 120 void __exit crypto_exit_proc(void) 121 { 122 remove_proc_entry("crypto", NULL); 123 } 124