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 <crypto/internal/aead.h> 14 #include <linux/completion.h> 15 #include <linux/ctype.h> 16 #include <linux/err.h> 17 #include <linux/init.h> 18 #include <linux/kthread.h> 19 #include <linux/module.h> 20 #include <linux/notifier.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/sched.h> 23 #include <linux/slab.h> 24 #include <linux/string.h> 25 26 #include "internal.h" 27 28 struct cryptomgr_param { 29 struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; 30 31 struct { 32 struct rtattr attr; 33 struct crypto_attr_type data; 34 } type; 35 36 union { 37 struct rtattr attr; 38 struct { 39 struct rtattr attr; 40 struct crypto_attr_alg data; 41 } alg; 42 struct { 43 struct rtattr attr; 44 struct crypto_attr_u32 data; 45 } nu32; 46 } attrs[CRYPTO_MAX_ATTRS]; 47 48 char template[CRYPTO_MAX_ALG_NAME]; 49 50 struct crypto_larval *larval; 51 52 u32 otype; 53 u32 omask; 54 }; 55 56 struct crypto_test_param { 57 char driver[CRYPTO_MAX_ALG_NAME]; 58 char alg[CRYPTO_MAX_ALG_NAME]; 59 u32 type; 60 }; 61 62 static int cryptomgr_probe(void *data) 63 { 64 struct cryptomgr_param *param = data; 65 struct crypto_template *tmpl; 66 struct crypto_instance *inst; 67 int err; 68 69 tmpl = crypto_lookup_template(param->template); 70 if (!tmpl) 71 goto out; 72 73 do { 74 if (tmpl->create) { 75 err = tmpl->create(tmpl, param->tb); 76 continue; 77 } 78 79 inst = tmpl->alloc(param->tb); 80 if (IS_ERR(inst)) 81 err = PTR_ERR(inst); 82 else if ((err = crypto_register_instance(tmpl, inst))) 83 tmpl->free(inst); 84 } while (err == -EAGAIN && !signal_pending(current)); 85 86 crypto_tmpl_put(tmpl); 87 88 out: 89 complete_all(¶m->larval->completion); 90 crypto_alg_put(¶m->larval->alg); 91 kfree(param); 92 module_put_and_exit(0); 93 } 94 95 static int cryptomgr_schedule_probe(struct crypto_larval *larval) 96 { 97 struct task_struct *thread; 98 struct cryptomgr_param *param; 99 const char *name = larval->alg.cra_name; 100 const char *p; 101 unsigned int len; 102 int i; 103 104 if (!try_module_get(THIS_MODULE)) 105 goto err; 106 107 param = kzalloc(sizeof(*param), GFP_KERNEL); 108 if (!param) 109 goto err_put_module; 110 111 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) 112 ; 113 114 len = p - name; 115 if (!len || *p != '(') 116 goto err_free_param; 117 118 memcpy(param->template, name, len); 119 120 i = 0; 121 for (;;) { 122 int notnum = 0; 123 124 name = ++p; 125 len = 0; 126 127 for (; isalnum(*p) || *p == '-' || *p == '_'; p++) 128 notnum |= !isdigit(*p); 129 130 if (*p == '(') { 131 int recursion = 0; 132 133 for (;;) { 134 if (!*++p) 135 goto err_free_param; 136 if (*p == '(') 137 recursion++; 138 else if (*p == ')' && !recursion--) 139 break; 140 } 141 142 notnum = 1; 143 p++; 144 } 145 146 len = p - name; 147 if (!len) 148 goto err_free_param; 149 150 if (notnum) { 151 param->attrs[i].alg.attr.rta_len = 152 sizeof(param->attrs[i].alg); 153 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; 154 memcpy(param->attrs[i].alg.data.name, name, len); 155 } else { 156 param->attrs[i].nu32.attr.rta_len = 157 sizeof(param->attrs[i].nu32); 158 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; 159 param->attrs[i].nu32.data.num = 160 simple_strtol(name, NULL, 0); 161 } 162 163 param->tb[i + 1] = ¶m->attrs[i].attr; 164 i++; 165 166 if (i >= CRYPTO_MAX_ATTRS) 167 goto err_free_param; 168 169 if (*p == ')') 170 break; 171 172 if (*p != ',') 173 goto err_free_param; 174 } 175 176 if (!i) 177 goto err_free_param; 178 179 param->tb[i + 1] = NULL; 180 181 param->type.attr.rta_len = sizeof(param->type); 182 param->type.attr.rta_type = CRYPTOA_TYPE; 183 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; 184 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; 185 param->tb[0] = ¶m->type.attr; 186 187 param->otype = larval->alg.cra_flags; 188 param->omask = larval->mask; 189 190 crypto_alg_get(&larval->alg); 191 param->larval = larval; 192 193 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); 194 if (IS_ERR(thread)) 195 goto err_put_larval; 196 197 wait_for_completion_interruptible(&larval->completion); 198 199 return NOTIFY_STOP; 200 201 err_put_larval: 202 crypto_alg_put(&larval->alg); 203 err_free_param: 204 kfree(param); 205 err_put_module: 206 module_put(THIS_MODULE); 207 err: 208 return NOTIFY_OK; 209 } 210 211 static int cryptomgr_test(void *data) 212 { 213 struct crypto_test_param *param = data; 214 u32 type = param->type; 215 int err = 0; 216 217 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS 218 goto skiptest; 219 #endif 220 221 if (type & CRYPTO_ALG_TESTED) 222 goto skiptest; 223 224 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); 225 226 skiptest: 227 crypto_alg_tested(param->driver, err); 228 229 kfree(param); 230 module_put_and_exit(0); 231 } 232 233 static int cryptomgr_schedule_test(struct crypto_alg *alg) 234 { 235 struct task_struct *thread; 236 struct crypto_test_param *param; 237 u32 type; 238 239 if (!try_module_get(THIS_MODULE)) 240 goto err; 241 242 param = kzalloc(sizeof(*param), GFP_KERNEL); 243 if (!param) 244 goto err_put_module; 245 246 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); 247 memcpy(param->alg, alg->cra_name, sizeof(param->alg)); 248 type = alg->cra_flags; 249 250 /* This piece of crap needs to disappear into per-type test hooks. */ 251 if (!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & 252 CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) && 253 ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == 254 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : 255 alg->cra_ablkcipher.ivsize)) 256 type |= CRYPTO_ALG_TESTED; 257 258 param->type = type; 259 260 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); 261 if (IS_ERR(thread)) 262 goto err_free_param; 263 264 return NOTIFY_STOP; 265 266 err_free_param: 267 kfree(param); 268 err_put_module: 269 module_put(THIS_MODULE); 270 err: 271 return NOTIFY_OK; 272 } 273 274 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, 275 void *data) 276 { 277 switch (msg) { 278 case CRYPTO_MSG_ALG_REQUEST: 279 return cryptomgr_schedule_probe(data); 280 case CRYPTO_MSG_ALG_REGISTER: 281 return cryptomgr_schedule_test(data); 282 } 283 284 return NOTIFY_DONE; 285 } 286 287 static struct notifier_block cryptomgr_notifier = { 288 .notifier_call = cryptomgr_notify, 289 }; 290 291 static int __init cryptomgr_init(void) 292 { 293 return crypto_register_notifier(&cryptomgr_notifier); 294 } 295 296 static void __exit cryptomgr_exit(void) 297 { 298 int err = crypto_unregister_notifier(&cryptomgr_notifier); 299 BUG_ON(err); 300 } 301 302 subsys_initcall(cryptomgr_init); 303 module_exit(cryptomgr_exit); 304 305 MODULE_LICENSE("GPL"); 306 MODULE_DESCRIPTION("Crypto Algorithm Manager"); 307