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/signal.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; 125 126 for (; isalnum(*p) || *p == '-' || *p == '_'; p++) 127 notnum |= !isdigit(*p); 128 129 if (*p == '(') { 130 int recursion = 0; 131 132 for (;;) { 133 if (!*++p) 134 goto err_free_param; 135 if (*p == '(') 136 recursion++; 137 else if (*p == ')' && !recursion--) 138 break; 139 } 140 141 notnum = 1; 142 p++; 143 } 144 145 len = p - name; 146 if (!len) 147 goto err_free_param; 148 149 if (notnum) { 150 param->attrs[i].alg.attr.rta_len = 151 sizeof(param->attrs[i].alg); 152 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; 153 memcpy(param->attrs[i].alg.data.name, name, len); 154 } else { 155 param->attrs[i].nu32.attr.rta_len = 156 sizeof(param->attrs[i].nu32); 157 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; 158 param->attrs[i].nu32.data.num = 159 simple_strtol(name, NULL, 0); 160 } 161 162 param->tb[i + 1] = ¶m->attrs[i].attr; 163 i++; 164 165 if (i >= CRYPTO_MAX_ATTRS) 166 goto err_free_param; 167 168 if (*p == ')') 169 break; 170 171 if (*p != ',') 172 goto err_free_param; 173 } 174 175 if (!i) 176 goto err_free_param; 177 178 param->tb[i + 1] = NULL; 179 180 param->type.attr.rta_len = sizeof(param->type); 181 param->type.attr.rta_type = CRYPTOA_TYPE; 182 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; 183 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; 184 param->tb[0] = ¶m->type.attr; 185 186 param->otype = larval->alg.cra_flags; 187 param->omask = larval->mask; 188 189 crypto_alg_get(&larval->alg); 190 param->larval = larval; 191 192 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); 193 if (IS_ERR(thread)) 194 goto err_put_larval; 195 196 wait_for_completion_interruptible(&larval->completion); 197 198 return NOTIFY_STOP; 199 200 err_put_larval: 201 crypto_alg_put(&larval->alg); 202 err_free_param: 203 kfree(param); 204 err_put_module: 205 module_put(THIS_MODULE); 206 err: 207 return NOTIFY_OK; 208 } 209 210 static int cryptomgr_test(void *data) 211 { 212 struct crypto_test_param *param = data; 213 u32 type = param->type; 214 int err = 0; 215 216 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS 217 goto skiptest; 218 #endif 219 220 if (type & CRYPTO_ALG_TESTED) 221 goto skiptest; 222 223 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); 224 225 skiptest: 226 crypto_alg_tested(param->driver, err); 227 228 kfree(param); 229 module_put_and_exit(0); 230 } 231 232 static int cryptomgr_schedule_test(struct crypto_alg *alg) 233 { 234 struct task_struct *thread; 235 struct crypto_test_param *param; 236 u32 type; 237 238 if (!try_module_get(THIS_MODULE)) 239 goto err; 240 241 param = kzalloc(sizeof(*param), GFP_KERNEL); 242 if (!param) 243 goto err_put_module; 244 245 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); 246 memcpy(param->alg, alg->cra_name, sizeof(param->alg)); 247 type = alg->cra_flags; 248 249 /* Do not test internal algorithms. */ 250 if (type & CRYPTO_ALG_INTERNAL) 251 type |= CRYPTO_ALG_TESTED; 252 253 param->type = type; 254 255 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); 256 if (IS_ERR(thread)) 257 goto err_free_param; 258 259 return NOTIFY_STOP; 260 261 err_free_param: 262 kfree(param); 263 err_put_module: 264 module_put(THIS_MODULE); 265 err: 266 return NOTIFY_OK; 267 } 268 269 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, 270 void *data) 271 { 272 switch (msg) { 273 case CRYPTO_MSG_ALG_REQUEST: 274 return cryptomgr_schedule_probe(data); 275 case CRYPTO_MSG_ALG_REGISTER: 276 return cryptomgr_schedule_test(data); 277 case CRYPTO_MSG_ALG_LOADED: 278 break; 279 } 280 281 return NOTIFY_DONE; 282 } 283 284 static struct notifier_block cryptomgr_notifier = { 285 .notifier_call = cryptomgr_notify, 286 }; 287 288 static int __init cryptomgr_init(void) 289 { 290 return crypto_register_notifier(&cryptomgr_notifier); 291 } 292 293 static void __exit cryptomgr_exit(void) 294 { 295 int err = crypto_unregister_notifier(&cryptomgr_notifier); 296 BUG_ON(err); 297 } 298 299 subsys_initcall(cryptomgr_init); 300 module_exit(cryptomgr_exit); 301 302 MODULE_LICENSE("GPL"); 303 MODULE_DESCRIPTION("Crypto Algorithm Manager"); 304