Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Create default crypto algorithm instances. |
| 3 | * |
| 4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the Free |
| 8 | * Software Foundation; either version 2 of the License, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/crypto.h> |
| 14 | #include <linux/ctype.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/init.h> |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 17 | #include <linux/kthread.h> |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 18 | #include <linux/module.h> |
| 19 | #include <linux/notifier.h> |
| 20 | #include <linux/rtnetlink.h> |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 21 | #include <linux/sched.h> |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 22 | #include <linux/string.h> |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 23 | |
| 24 | #include "internal.h" |
| 25 | |
| 26 | struct cryptomgr_param { |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 27 | struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 28 | |
| 29 | struct { |
| 30 | struct rtattr attr; |
| 31 | struct crypto_attr_type data; |
| 32 | } type; |
| 33 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 34 | union { |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 35 | struct rtattr attr; |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 36 | struct { |
| 37 | struct rtattr attr; |
| 38 | struct crypto_attr_alg data; |
| 39 | } alg; |
| 40 | struct { |
| 41 | struct rtattr attr; |
| 42 | struct crypto_attr_u32 data; |
| 43 | } nu32; |
| 44 | } attrs[CRYPTO_MAX_ATTRS]; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 45 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 46 | char larval[CRYPTO_MAX_ALG_NAME]; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 47 | char template[CRYPTO_MAX_ALG_NAME]; |
| 48 | }; |
| 49 | |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 50 | static int cryptomgr_probe(void *data) |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 51 | { |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 52 | struct cryptomgr_param *param = data; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 53 | struct crypto_template *tmpl; |
| 54 | struct crypto_instance *inst; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 55 | int err; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 56 | |
| 57 | tmpl = crypto_lookup_template(param->template); |
| 58 | if (!tmpl) |
| 59 | goto err; |
| 60 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 61 | do { |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 62 | inst = tmpl->alloc(param->tb); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 63 | if (IS_ERR(inst)) |
| 64 | err = PTR_ERR(inst); |
| 65 | else if ((err = crypto_register_instance(tmpl, inst))) |
| 66 | tmpl->free(inst); |
| 67 | } while (err == -EAGAIN && !signal_pending(current)); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 68 | |
| 69 | crypto_tmpl_put(tmpl); |
| 70 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 71 | if (err) |
| 72 | goto err; |
| 73 | |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 74 | out: |
| 75 | kfree(param); |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 76 | module_put_and_exit(0); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 77 | |
| 78 | err: |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 79 | crypto_larval_error(param->larval, param->type.data.type, |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 80 | param->type.data.mask); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 81 | goto out; |
| 82 | } |
| 83 | |
| 84 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) |
| 85 | { |
Herbert Xu | 1605b84 | 2007-05-09 13:04:39 +1000 | [diff] [blame] | 86 | struct task_struct *thread; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 87 | struct cryptomgr_param *param; |
| 88 | const char *name = larval->alg.cra_name; |
| 89 | const char *p; |
| 90 | unsigned int len; |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 91 | int i; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 92 | |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 93 | if (!try_module_get(THIS_MODULE)) |
| 94 | goto err; |
| 95 | |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 96 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 97 | if (!param) |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 98 | goto err_put_module; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 99 | |
| 100 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) |
| 101 | ; |
| 102 | |
| 103 | len = p - name; |
| 104 | if (!len || *p != '(') |
| 105 | goto err_free_param; |
| 106 | |
| 107 | memcpy(param->template, name, len); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 108 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 109 | i = 0; |
| 110 | for (;;) { |
| 111 | int notnum = 0; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 112 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 113 | name = ++p; |
| 114 | len = 0; |
| 115 | |
| 116 | for (; isalnum(*p) || *p == '-' || *p == '_'; p++) |
| 117 | notnum |= !isdigit(*p); |
| 118 | |
| 119 | if (*p == '(') { |
| 120 | int recursion = 0; |
| 121 | |
| 122 | for (;;) { |
| 123 | if (!*++p) |
| 124 | goto err_free_param; |
| 125 | if (*p == '(') |
| 126 | recursion++; |
| 127 | else if (*p == ')' && !recursion--) |
| 128 | break; |
| 129 | } |
| 130 | |
| 131 | notnum = 1; |
| 132 | } |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 133 | |
| 134 | len = p - name; |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 135 | if (!len) |
| 136 | goto err_free_param; |
| 137 | |
| 138 | if (notnum) { |
| 139 | param->attrs[i].alg.attr.rta_len = |
| 140 | sizeof(param->attrs[i].alg); |
| 141 | param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; |
| 142 | memcpy(param->attrs[i].alg.data.name, name, len); |
| 143 | } else { |
| 144 | param->attrs[i].nu32.attr.rta_len = |
| 145 | sizeof(param->attrs[i].nu32); |
| 146 | param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; |
| 147 | param->attrs[i].nu32.data.num = |
| 148 | simple_strtol(name, NULL, 0); |
| 149 | } |
| 150 | |
| 151 | param->tb[i + 1] = ¶m->attrs[i].attr; |
| 152 | i++; |
| 153 | |
| 154 | if (WARN_ON(i >= CRYPTO_MAX_ATTRS)) |
| 155 | goto err_free_param; |
| 156 | |
| 157 | if (*p == ')') |
| 158 | break; |
| 159 | |
| 160 | if (*p != ',') |
| 161 | goto err_free_param; |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 162 | } |
| 163 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 164 | if (!i) |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 165 | goto err_free_param; |
| 166 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 167 | param->tb[i + 1] = NULL; |
| 168 | |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 169 | param->type.attr.rta_len = sizeof(param->type); |
| 170 | param->type.attr.rta_type = CRYPTOA_TYPE; |
| 171 | param->type.data.type = larval->alg.cra_flags; |
| 172 | param->type.data.mask = larval->mask; |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 173 | param->tb[0] = ¶m->type.attr; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 174 | |
Herbert Xu | 39e1ee0 | 2007-08-29 19:27:26 +0800 | [diff] [blame^] | 175 | memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 176 | |
Herbert Xu | 1605b84 | 2007-05-09 13:04:39 +1000 | [diff] [blame] | 177 | thread = kthread_run(cryptomgr_probe, param, "cryptomgr"); |
| 178 | if (IS_ERR(thread)) |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 179 | goto err_free_param; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 180 | |
| 181 | return NOTIFY_STOP; |
| 182 | |
| 183 | err_free_param: |
| 184 | kfree(param); |
Herbert Xu | cf02f5d | 2007-03-29 17:32:59 +1000 | [diff] [blame] | 185 | err_put_module: |
| 186 | module_put(THIS_MODULE); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 187 | err: |
| 188 | return NOTIFY_OK; |
| 189 | } |
| 190 | |
| 191 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, |
| 192 | void *data) |
| 193 | { |
| 194 | switch (msg) { |
| 195 | case CRYPTO_MSG_ALG_REQUEST: |
| 196 | return cryptomgr_schedule_probe(data); |
| 197 | } |
| 198 | |
| 199 | return NOTIFY_DONE; |
| 200 | } |
| 201 | |
| 202 | static struct notifier_block cryptomgr_notifier = { |
| 203 | .notifier_call = cryptomgr_notify, |
| 204 | }; |
| 205 | |
| 206 | static int __init cryptomgr_init(void) |
| 207 | { |
| 208 | return crypto_register_notifier(&cryptomgr_notifier); |
| 209 | } |
| 210 | |
| 211 | static void __exit cryptomgr_exit(void) |
| 212 | { |
| 213 | int err = crypto_unregister_notifier(&cryptomgr_notifier); |
| 214 | BUG_ON(err); |
| 215 | } |
| 216 | |
| 217 | module_init(cryptomgr_init); |
| 218 | module_exit(cryptomgr_exit); |
| 219 | |
| 220 | MODULE_LICENSE("GPL"); |
| 221 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |