| 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"); |