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