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/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 if (tmpl->create) { 72 err = tmpl->create(tmpl, param->tb); 73 continue; 74 } 75 76 inst = tmpl->alloc(param->tb); 77 if (IS_ERR(inst)) 78 err = PTR_ERR(inst); 79 else if ((err = crypto_register_instance(tmpl, inst))) 80 tmpl->free(inst); 81 } while (err == -EAGAIN && !signal_pending(current)); 82 83 crypto_tmpl_put(tmpl); 84 85 if (err) 86 goto err; 87 88 out: 89 kfree(param); 90 module_put_and_exit(0); 91 92 err: 93 crypto_larval_error(param->larval, param->otype, param->omask); 94 goto out; 95 } 96 97 static int cryptomgr_schedule_probe(struct crypto_larval *larval) 98 { 99 struct task_struct *thread; 100 struct cryptomgr_param *param; 101 const char *name = larval->alg.cra_name; 102 const char *p; 103 unsigned int len; 104 int i; 105 106 if (!try_module_get(THIS_MODULE)) 107 goto err; 108 109 param = kzalloc(sizeof(*param), GFP_KERNEL); 110 if (!param) 111 goto err_put_module; 112 113 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) 114 ; 115 116 len = p - name; 117 if (!len || *p != '(') 118 goto err_free_param; 119 120 memcpy(param->template, name, len); 121 122 i = 0; 123 for (;;) { 124 int notnum = 0; 125 126 name = ++p; 127 len = 0; 128 129 for (; isalnum(*p) || *p == '-' || *p == '_'; p++) 130 notnum |= !isdigit(*p); 131 132 if (*p == '(') { 133 int recursion = 0; 134 135 for (;;) { 136 if (!*++p) 137 goto err_free_param; 138 if (*p == '(') 139 recursion++; 140 else if (*p == ')' && !recursion--) 141 break; 142 } 143 144 notnum = 1; 145 p++; 146 } 147 148 len = p - name; 149 if (!len) 150 goto err_free_param; 151 152 if (notnum) { 153 param->attrs[i].alg.attr.rta_len = 154 sizeof(param->attrs[i].alg); 155 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; 156 memcpy(param->attrs[i].alg.data.name, name, len); 157 } else { 158 param->attrs[i].nu32.attr.rta_len = 159 sizeof(param->attrs[i].nu32); 160 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; 161 param->attrs[i].nu32.data.num = 162 simple_strtol(name, NULL, 0); 163 } 164 165 param->tb[i + 1] = ¶m->attrs[i].attr; 166 i++; 167 168 if (i >= CRYPTO_MAX_ATTRS) 169 goto err_free_param; 170 171 if (*p == ')') 172 break; 173 174 if (*p != ',') 175 goto err_free_param; 176 } 177 178 if (!i) 179 goto err_free_param; 180 181 param->tb[i + 1] = NULL; 182 183 param->type.attr.rta_len = sizeof(param->type); 184 param->type.attr.rta_type = CRYPTOA_TYPE; 185 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; 186 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; 187 param->tb[0] = ¶m->type.attr; 188 189 param->otype = larval->alg.cra_flags; 190 param->omask = larval->mask; 191 192 memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); 193 194 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); 195 if (IS_ERR(thread)) 196 goto err_free_param; 197 198 return NOTIFY_STOP; 199 200 err_free_param: 201 kfree(param); 202 err_put_module: 203 module_put(THIS_MODULE); 204 err: 205 return NOTIFY_OK; 206 } 207 208 static int cryptomgr_test(void *data) 209 { 210 struct crypto_test_param *param = data; 211 u32 type = param->type; 212 int err = 0; 213 214 if (type & CRYPTO_ALG_TESTED) 215 goto skiptest; 216 217 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); 218 219 skiptest: 220 crypto_alg_tested(param->driver, err); 221 222 kfree(param); 223 module_put_and_exit(0); 224 } 225 226 static int cryptomgr_schedule_test(struct crypto_alg *alg) 227 { 228 struct task_struct *thread; 229 struct crypto_test_param *param; 230 u32 type; 231 232 if (!try_module_get(THIS_MODULE)) 233 goto err; 234 235 param = kzalloc(sizeof(*param), GFP_KERNEL); 236 if (!param) 237 goto err_put_module; 238 239 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); 240 memcpy(param->alg, alg->cra_name, sizeof(param->alg)); 241 type = alg->cra_flags; 242 243 /* This piece of crap needs to disappear into per-type test hooks. */ 244 if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & 245 CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) && 246 ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == 247 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : 248 alg->cra_ablkcipher.ivsize)) || 249 (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) && 250 alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize)) 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 } 278 279 return NOTIFY_DONE; 280 } 281 282 static struct notifier_block cryptomgr_notifier = { 283 .notifier_call = cryptomgr_notify, 284 }; 285 286 static int __init cryptomgr_init(void) 287 { 288 return crypto_register_notifier(&cryptomgr_notifier); 289 } 290 291 static void __exit cryptomgr_exit(void) 292 { 293 int err = crypto_unregister_notifier(&cryptomgr_notifier); 294 BUG_ON(err); 295 } 296 297 subsys_initcall(cryptomgr_init); 298 module_exit(cryptomgr_exit); 299 300 MODULE_LICENSE("GPL"); 301 MODULE_DESCRIPTION("Crypto Algorithm Manager"); 302