| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * pcrypt - Parallel crypto wrapper. |
| 4 | * |
| 5 | * Copyright (C) 2009 secunet Security Networks AG |
| 6 | * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com> |
| 7 | */ |
| 8 | |
| 9 | #include <crypto/algapi.h> |
| 10 | #include <crypto/internal/aead.h> |
| 11 | #include <linux/atomic.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/kobject.h> |
| 17 | #include <linux/cpu.h> |
| 18 | #include <crypto/pcrypt.h> |
| 19 | |
| 20 | static struct padata_instance *pencrypt; |
| 21 | static struct padata_instance *pdecrypt; |
| 22 | static struct kset *pcrypt_kset; |
| 23 | |
| 24 | struct pcrypt_instance_ctx { |
| 25 | struct crypto_aead_spawn spawn; |
| 26 | struct padata_shell *psenc; |
| 27 | struct padata_shell *psdec; |
| 28 | atomic_t tfm_count; |
| 29 | }; |
| 30 | |
| 31 | struct pcrypt_aead_ctx { |
| 32 | struct crypto_aead *child; |
| 33 | unsigned int cb_cpu; |
| 34 | }; |
| 35 | |
| 36 | static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx( |
| 37 | struct crypto_aead *tfm) |
| 38 | { |
| 39 | return aead_instance_ctx(aead_alg_instance(tfm)); |
| 40 | } |
| 41 | |
| 42 | static int pcrypt_aead_setkey(struct crypto_aead *parent, |
| 43 | const u8 *key, unsigned int keylen) |
| 44 | { |
| 45 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); |
| 46 | |
| 47 | return crypto_aead_setkey(ctx->child, key, keylen); |
| 48 | } |
| 49 | |
| 50 | static int pcrypt_aead_setauthsize(struct crypto_aead *parent, |
| 51 | unsigned int authsize) |
| 52 | { |
| 53 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); |
| 54 | |
| 55 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 56 | } |
| 57 | |
| 58 | static void pcrypt_aead_serial(struct padata_priv *padata) |
| 59 | { |
| 60 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 61 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 62 | |
| 63 | aead_request_complete(req->base.data, padata->info); |
| 64 | } |
| 65 | |
| 66 | static void pcrypt_aead_done(void *data, int err) |
| 67 | { |
| 68 | struct aead_request *req = data; |
| 69 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 70 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 71 | |
| 72 | padata->info = err; |
| 73 | |
| 74 | padata_do_serial(padata); |
| 75 | } |
| 76 | |
| 77 | static void pcrypt_aead_enc(struct padata_priv *padata) |
| 78 | { |
| 79 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 80 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 81 | int ret; |
| 82 | |
| 83 | ret = crypto_aead_encrypt(req); |
| 84 | |
| 85 | if (ret == -EINPROGRESS) |
| 86 | return; |
| 87 | |
| 88 | padata->info = ret; |
| 89 | padata_do_serial(padata); |
| 90 | } |
| 91 | |
| 92 | static int pcrypt_aead_encrypt(struct aead_request *req) |
| 93 | { |
| 94 | int err; |
| 95 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 96 | struct aead_request *creq = pcrypt_request_ctx(preq); |
| 97 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 98 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 99 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); |
| 100 | u32 flags = aead_request_flags(req); |
| 101 | struct pcrypt_instance_ctx *ictx; |
| 102 | |
| 103 | ictx = pcrypt_tfm_ictx(aead); |
| 104 | |
| 105 | memset(padata, 0, sizeof(struct padata_priv)); |
| 106 | |
| 107 | padata->parallel = pcrypt_aead_enc; |
| 108 | padata->serial = pcrypt_aead_serial; |
| 109 | |
| 110 | aead_request_set_tfm(creq, ctx->child); |
| 111 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
| 112 | pcrypt_aead_done, req); |
| 113 | aead_request_set_crypt(creq, req->src, req->dst, |
| 114 | req->cryptlen, req->iv); |
| 115 | aead_request_set_ad(creq, req->assoclen); |
| 116 | |
| 117 | err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu); |
| 118 | if (!err) |
| 119 | return -EINPROGRESS; |
| 120 | |
| 121 | return err; |
| 122 | } |
| 123 | |
| 124 | static void pcrypt_aead_dec(struct padata_priv *padata) |
| 125 | { |
| 126 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 127 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 128 | int ret; |
| 129 | |
| 130 | ret = crypto_aead_decrypt(req); |
| 131 | |
| 132 | if (ret == -EINPROGRESS) |
| 133 | return; |
| 134 | |
| 135 | padata->info = ret; |
| 136 | padata_do_serial(padata); |
| 137 | } |
| 138 | |
| 139 | static int pcrypt_aead_decrypt(struct aead_request *req) |
| 140 | { |
| 141 | int err; |
| 142 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 143 | struct aead_request *creq = pcrypt_request_ctx(preq); |
| 144 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 145 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 146 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); |
| 147 | u32 flags = aead_request_flags(req); |
| 148 | struct pcrypt_instance_ctx *ictx; |
| 149 | |
| 150 | ictx = pcrypt_tfm_ictx(aead); |
| 151 | |
| 152 | memset(padata, 0, sizeof(struct padata_priv)); |
| 153 | |
| 154 | padata->parallel = pcrypt_aead_dec; |
| 155 | padata->serial = pcrypt_aead_serial; |
| 156 | |
| 157 | aead_request_set_tfm(creq, ctx->child); |
| 158 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
| 159 | pcrypt_aead_done, req); |
| 160 | aead_request_set_crypt(creq, req->src, req->dst, |
| 161 | req->cryptlen, req->iv); |
| 162 | aead_request_set_ad(creq, req->assoclen); |
| 163 | |
| 164 | err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu); |
| 165 | if (!err) |
| 166 | return -EINPROGRESS; |
| 167 | |
| 168 | return err; |
| 169 | } |
| 170 | |
| 171 | static int pcrypt_aead_init_tfm(struct crypto_aead *tfm) |
| 172 | { |
| 173 | int cpu, cpu_index; |
| 174 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 175 | struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst); |
| 176 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); |
| 177 | struct crypto_aead *cipher; |
| 178 | |
| 179 | cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) % |
| 180 | cpumask_weight(cpu_online_mask); |
| 181 | |
| 182 | ctx->cb_cpu = cpumask_first(cpu_online_mask); |
| 183 | for (cpu = 0; cpu < cpu_index; cpu++) |
| 184 | ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask); |
| 185 | |
| 186 | cipher = crypto_spawn_aead(&ictx->spawn); |
| 187 | |
| 188 | if (IS_ERR(cipher)) |
| 189 | return PTR_ERR(cipher); |
| 190 | |
| 191 | ctx->child = cipher; |
| 192 | crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) + |
| 193 | sizeof(struct aead_request) + |
| 194 | crypto_aead_reqsize(cipher)); |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm) |
| 200 | { |
| 201 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm); |
| 202 | |
| 203 | crypto_free_aead(ctx->child); |
| 204 | } |
| 205 | |
| 206 | static void pcrypt_free(struct aead_instance *inst) |
| 207 | { |
| 208 | struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst); |
| 209 | |
| 210 | crypto_drop_aead(&ctx->spawn); |
| 211 | padata_free_shell(ctx->psdec); |
| 212 | padata_free_shell(ctx->psenc); |
| 213 | kfree(inst); |
| 214 | } |
| 215 | |
| 216 | static int pcrypt_init_instance(struct crypto_instance *inst, |
| 217 | struct crypto_alg *alg) |
| 218 | { |
| 219 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 220 | "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| 221 | return -ENAMETOOLONG; |
| 222 | |
| 223 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
| 224 | |
| 225 | inst->alg.cra_priority = alg->cra_priority + 100; |
| 226 | inst->alg.cra_blocksize = alg->cra_blocksize; |
| 227 | inst->alg.cra_alignmask = alg->cra_alignmask; |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb, |
| 233 | struct crypto_attr_type *algt) |
| 234 | { |
| 235 | struct pcrypt_instance_ctx *ctx; |
| 236 | struct aead_instance *inst; |
| 237 | struct aead_alg *alg; |
| 238 | u32 mask = crypto_algt_inherited_mask(algt); |
| 239 | int err; |
| 240 | |
| 241 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 242 | if (!inst) |
| 243 | return -ENOMEM; |
| 244 | |
| 245 | err = -ENOMEM; |
| 246 | |
| 247 | ctx = aead_instance_ctx(inst); |
| 248 | ctx->psenc = padata_alloc_shell(pencrypt); |
| 249 | if (!ctx->psenc) |
| 250 | goto err_free_inst; |
| 251 | |
| 252 | ctx->psdec = padata_alloc_shell(pdecrypt); |
| 253 | if (!ctx->psdec) |
| 254 | goto err_free_inst; |
| 255 | |
| 256 | err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst), |
| 257 | crypto_attr_alg_name(tb[1]), 0, mask); |
| 258 | if (err) |
| 259 | goto err_free_inst; |
| 260 | |
| 261 | alg = crypto_spawn_aead_alg(&ctx->spawn); |
| 262 | err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base); |
| 263 | if (err) |
| 264 | goto err_free_inst; |
| 265 | |
| 266 | inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC; |
| 267 | |
| 268 | inst->alg.ivsize = crypto_aead_alg_ivsize(alg); |
| 269 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
| 270 | |
| 271 | inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); |
| 272 | |
| 273 | inst->alg.init = pcrypt_aead_init_tfm; |
| 274 | inst->alg.exit = pcrypt_aead_exit_tfm; |
| 275 | |
| 276 | inst->alg.setkey = pcrypt_aead_setkey; |
| 277 | inst->alg.setauthsize = pcrypt_aead_setauthsize; |
| 278 | inst->alg.encrypt = pcrypt_aead_encrypt; |
| 279 | inst->alg.decrypt = pcrypt_aead_decrypt; |
| 280 | |
| 281 | inst->free = pcrypt_free; |
| 282 | |
| 283 | err = aead_register_instance(tmpl, inst); |
| 284 | if (err) { |
| 285 | err_free_inst: |
| 286 | pcrypt_free(inst); |
| 287 | } |
| 288 | return err; |
| 289 | } |
| 290 | |
| 291 | static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb) |
| 292 | { |
| 293 | struct crypto_attr_type *algt; |
| 294 | |
| 295 | algt = crypto_get_attr_type(tb); |
| 296 | if (IS_ERR(algt)) |
| 297 | return PTR_ERR(algt); |
| 298 | |
| 299 | switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { |
| 300 | case CRYPTO_ALG_TYPE_AEAD: |
| 301 | return pcrypt_create_aead(tmpl, tb, algt); |
| 302 | } |
| 303 | |
| 304 | return -EINVAL; |
| 305 | } |
| 306 | |
| 307 | static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) |
| 308 | { |
| 309 | int ret; |
| 310 | |
| 311 | pinst->kobj.kset = pcrypt_kset; |
| 312 | ret = kobject_add(&pinst->kobj, NULL, "%s", name); |
| 313 | if (!ret) |
| 314 | kobject_uevent(&pinst->kobj, KOBJ_ADD); |
| 315 | |
| 316 | return ret; |
| 317 | } |
| 318 | |
| 319 | static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) |
| 320 | { |
| 321 | int ret = -ENOMEM; |
| 322 | |
| 323 | *pinst = padata_alloc(name); |
| 324 | if (!*pinst) |
| 325 | return ret; |
| 326 | |
| 327 | ret = pcrypt_sysfs_add(*pinst, name); |
| 328 | if (ret) |
| 329 | padata_free(*pinst); |
| 330 | |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | static struct crypto_template pcrypt_tmpl = { |
| 335 | .name = "pcrypt", |
| 336 | .create = pcrypt_create, |
| 337 | .module = THIS_MODULE, |
| 338 | }; |
| 339 | |
| 340 | static int __init pcrypt_init(void) |
| 341 | { |
| 342 | int err = -ENOMEM; |
| 343 | |
| 344 | pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj); |
| 345 | if (!pcrypt_kset) |
| 346 | goto err; |
| 347 | |
| 348 | err = pcrypt_init_padata(&pencrypt, "pencrypt"); |
| 349 | if (err) |
| 350 | goto err_unreg_kset; |
| 351 | |
| 352 | err = pcrypt_init_padata(&pdecrypt, "pdecrypt"); |
| 353 | if (err) |
| 354 | goto err_deinit_pencrypt; |
| 355 | |
| 356 | return crypto_register_template(&pcrypt_tmpl); |
| 357 | |
| 358 | err_deinit_pencrypt: |
| 359 | padata_free(pencrypt); |
| 360 | err_unreg_kset: |
| 361 | kset_unregister(pcrypt_kset); |
| 362 | err: |
| 363 | return err; |
| 364 | } |
| 365 | |
| 366 | static void __exit pcrypt_exit(void) |
| 367 | { |
| 368 | crypto_unregister_template(&pcrypt_tmpl); |
| 369 | |
| 370 | padata_free(pencrypt); |
| 371 | padata_free(pdecrypt); |
| 372 | |
| 373 | kset_unregister(pcrypt_kset); |
| 374 | } |
| 375 | |
| 376 | subsys_initcall(pcrypt_init); |
| 377 | module_exit(pcrypt_exit); |
| 378 | |
| 379 | MODULE_LICENSE("GPL"); |
| 380 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
| 381 | MODULE_DESCRIPTION("Parallel crypto wrapper"); |
| 382 | MODULE_ALIAS_CRYPTO("pcrypt"); |