diff options
Diffstat (limited to '')
| -rw-r--r-- | crypto/cryptd.c | 1102 |
1 files changed, 1102 insertions, 0 deletions
diff --git a/crypto/cryptd.c b/crypto/cryptd.c new file mode 100644 index 000000000..ca3a40fc7 --- /dev/null +++ b/crypto/cryptd.c @@ -0,0 +1,1102 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Software async crypto daemon. + * + * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> + * + * Added AEAD support to cryptd. + * Authors: Tadeusz Struk (tadeusz.struk@intel.com) + * Adrian Hoban <adrian.hoban@intel.com> + * Gabriele Paoloni <gabriele.paoloni@intel.com> + * Aidan O'Mahony (aidan.o.mahony@intel.com) + * Copyright (c) 2010, Intel Corporation. + */ + +#include <crypto/internal/hash.h> +#include <crypto/internal/aead.h> +#include <crypto/internal/skcipher.h> +#include <crypto/cryptd.h> +#include <linux/refcount.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/scatterlist.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +static unsigned int cryptd_max_cpu_qlen = 1000; +module_param(cryptd_max_cpu_qlen, uint, 0); +MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth"); + +static struct workqueue_struct *cryptd_wq; + +struct cryptd_cpu_queue { + struct crypto_queue queue; + struct work_struct work; +}; + +struct cryptd_queue { + /* + * Protected by disabling BH to allow enqueueing from softinterrupt and + * dequeuing from kworker (cryptd_queue_worker()). + */ + struct cryptd_cpu_queue __percpu *cpu_queue; +}; + +struct cryptd_instance_ctx { + struct crypto_spawn spawn; + struct cryptd_queue *queue; +}; + +struct skcipherd_instance_ctx { + struct crypto_skcipher_spawn spawn; + struct cryptd_queue *queue; +}; + +struct hashd_instance_ctx { + struct crypto_shash_spawn spawn; + struct cryptd_queue *queue; +}; + +struct aead_instance_ctx { + struct crypto_aead_spawn aead_spawn; + struct cryptd_queue *queue; +}; + +struct cryptd_skcipher_ctx { + refcount_t refcnt; + struct crypto_skcipher *child; +}; + +struct cryptd_skcipher_request_ctx { + crypto_completion_t complete; + struct skcipher_request req; +}; + +struct cryptd_hash_ctx { + refcount_t refcnt; + struct crypto_shash *child; +}; + +struct cryptd_hash_request_ctx { + crypto_completion_t complete; + struct shash_desc desc; +}; + +struct cryptd_aead_ctx { + refcount_t refcnt; + struct crypto_aead *child; +}; + +struct cryptd_aead_request_ctx { + crypto_completion_t complete; +}; + +static void cryptd_queue_worker(struct work_struct *work); + +static int cryptd_init_queue(struct cryptd_queue *queue, + unsigned int max_cpu_qlen) +{ + int cpu; + struct cryptd_cpu_queue *cpu_queue; + + queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue); + if (!queue->cpu_queue) + return -ENOMEM; + for_each_possible_cpu(cpu) { + cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); + crypto_init_queue(&cpu_queue->queue, max_cpu_qlen); + INIT_WORK(&cpu_queue->work, cryptd_queue_worker); + } + pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen); + return 0; +} + +static void cryptd_fini_queue(struct cryptd_queue *queue) +{ + int cpu; + struct cryptd_cpu_queue *cpu_queue; + + for_each_possible_cpu(cpu) { + cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); + BUG_ON(cpu_queue->queue.qlen); + } + free_percpu(queue->cpu_queue); +} + +static int cryptd_enqueue_request(struct cryptd_queue *queue, + struct crypto_async_request *request) +{ + int err; + struct cryptd_cpu_queue *cpu_queue; + refcount_t *refcnt; + + local_bh_disable(); + cpu_queue = this_cpu_ptr(queue->cpu_queue); + err = crypto_enqueue_request(&cpu_queue->queue, request); + + refcnt = crypto_tfm_ctx(request->tfm); + + if (err == -ENOSPC) + goto out; + + queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work); + + if (!refcount_read(refcnt)) + goto out; + + refcount_inc(refcnt); + +out: + local_bh_enable(); + + return err; +} + +/* Called in workqueue context, do one real cryption work (via + * req->complete) and reschedule itself if there are more work to + * do. */ +static void cryptd_queue_worker(struct work_struct *work) +{ + struct cryptd_cpu_queue *cpu_queue; + struct crypto_async_request *req, *backlog; + + cpu_queue = container_of(work, struct cryptd_cpu_queue, work); + /* + * Only handle one request at a time to avoid hogging crypto workqueue. + */ + local_bh_disable(); + backlog = crypto_get_backlog(&cpu_queue->queue); + req = crypto_dequeue_request(&cpu_queue->queue); + local_bh_enable(); + + if (!req) + return; + + if (backlog) + backlog->complete(backlog, -EINPROGRESS); + req->complete(req, 0); + + if (cpu_queue->queue.qlen) + queue_work(cryptd_wq, &cpu_queue->work); +} + +static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm) +{ + struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); + struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); + return ictx->queue; +} + +static void cryptd_type_and_mask(struct crypto_attr_type *algt, + u32 *type, u32 *mask) +{ + /* + * cryptd is allowed to wrap internal algorithms, but in that case the + * resulting cryptd instance will be marked as internal as well. + */ + *type = algt->type & CRYPTO_ALG_INTERNAL; + *mask = algt->mask & CRYPTO_ALG_INTERNAL; + + /* No point in cryptd wrapping an algorithm that's already async. */ + *mask |= CRYPTO_ALG_ASYNC; + + *mask |= crypto_algt_inherited_mask(algt); +} + +static int cryptd_init_instance(struct crypto_instance *inst, + struct crypto_alg *alg) +{ + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", + alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + return -ENAMETOOLONG; + + memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); + + inst->alg.cra_priority = alg->cra_priority + 50; + inst->alg.cra_blocksize = alg->cra_blocksize; + inst->alg.cra_alignmask = alg->cra_alignmask; + + return 0; +} + +static int cryptd_skcipher_setkey(struct crypto_skcipher *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent); + struct crypto_skcipher *child = ctx->child; + + crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(child, + crypto_skcipher_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + return crypto_skcipher_setkey(child, key, keylen); +} + +static void cryptd_skcipher_complete(struct skcipher_request *req, int err) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + int refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_skcipher(tfm); +} + +static void cryptd_skcipher_encrypt(struct crypto_async_request *base, + int err) +{ + struct skcipher_request *req = skcipher_request_cast(base); + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_request *subreq = &rctx->req; + struct crypto_skcipher *child = ctx->child; + + if (unlikely(err == -EINPROGRESS)) + goto out; + + skcipher_request_set_tfm(subreq, child); + skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP, + NULL, NULL); + skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, + req->iv); + + err = crypto_skcipher_encrypt(subreq); + skcipher_request_zero(subreq); + + req->base.complete = rctx->complete; + +out: + cryptd_skcipher_complete(req, err); +} + +static void cryptd_skcipher_decrypt(struct crypto_async_request *base, + int err) +{ + struct skcipher_request *req = skcipher_request_cast(base); + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_request *subreq = &rctx->req; + struct crypto_skcipher *child = ctx->child; + + if (unlikely(err == -EINPROGRESS)) + goto out; + + skcipher_request_set_tfm(subreq, child); + skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP, + NULL, NULL); + skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, + req->iv); + + err = crypto_skcipher_decrypt(subreq); + skcipher_request_zero(subreq); + + req->base.complete = rctx->complete; + +out: + cryptd_skcipher_complete(req, err); +} + +static int cryptd_skcipher_enqueue(struct skcipher_request *req, + crypto_completion_t compl) +{ + struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct cryptd_queue *queue; + + queue = cryptd_get_queue(crypto_skcipher_tfm(tfm)); + rctx->complete = req->base.complete; + req->base.complete = compl; + + return cryptd_enqueue_request(queue, &req->base); +} + +static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req) +{ + return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt); +} + +static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req) +{ + return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt); +} + +static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm) +{ + struct skcipher_instance *inst = skcipher_alg_instance(tfm); + struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst); + struct crypto_skcipher_spawn *spawn = &ictx->spawn; + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_skcipher *cipher; + + cipher = crypto_spawn_skcipher(spawn); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + ctx->child = cipher; + crypto_skcipher_set_reqsize( + tfm, sizeof(struct cryptd_skcipher_request_ctx) + + crypto_skcipher_reqsize(cipher)); + return 0; +} + +static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); + + crypto_free_skcipher(ctx->child); +} + +static void cryptd_skcipher_free(struct skcipher_instance *inst) +{ + struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst); + + crypto_drop_skcipher(&ctx->spawn); + kfree(inst); +} + +static int cryptd_create_skcipher(struct crypto_template *tmpl, + struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct skcipherd_instance_ctx *ctx; + struct skcipher_instance *inst; + struct skcipher_alg *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = skcipher_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + + alg = crypto_spawn_skcipher_alg(&ctx->spawn); + err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & CRYPTO_ALG_INTERNAL); + inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg); + inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg); + inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg); + inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg); + + inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx); + + inst->alg.init = cryptd_skcipher_init_tfm; + inst->alg.exit = cryptd_skcipher_exit_tfm; + + inst->alg.setkey = cryptd_skcipher_setkey; + inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue; + inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue; + + inst->free = cryptd_skcipher_free; + + err = skcipher_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_skcipher_free(inst); + } + return err; +} + +static int cryptd_hash_init_tfm(struct crypto_tfm *tfm) +{ + struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); + struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst); + struct crypto_shash_spawn *spawn = &ictx->spawn; + struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); + struct crypto_shash *hash; + + hash = crypto_spawn_shash(spawn); + if (IS_ERR(hash)) + return PTR_ERR(hash); + + ctx->child = hash; + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct cryptd_hash_request_ctx) + + crypto_shash_descsize(hash)); + return 0; +} + +static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); + + crypto_free_shash(ctx->child); +} + +static int cryptd_hash_setkey(struct crypto_ahash *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent); + struct crypto_shash *child = ctx->child; + + crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + return crypto_shash_setkey(child, key, keylen); +} + +static int cryptd_hash_enqueue(struct ahash_request *req, + crypto_completion_t compl) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_queue *queue = + cryptd_get_queue(crypto_ahash_tfm(tfm)); + + rctx->complete = req->base.complete; + req->base.complete = compl; + + return cryptd_enqueue_request(queue, &req->base); +} + +static void cryptd_hash_complete(struct ahash_request *req, int err) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + int refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_ahash(tfm); +} + +static void cryptd_hash_init(struct crypto_async_request *req_async, int err) +{ + struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); + struct crypto_shash *child = ctx->child; + struct ahash_request *req = ahash_request_cast(req_async); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + struct shash_desc *desc = &rctx->desc; + + if (unlikely(err == -EINPROGRESS)) + goto out; + + desc->tfm = child; + + err = crypto_shash_init(desc); + + req->base.complete = rctx->complete; + +out: + cryptd_hash_complete(req, err); +} + +static int cryptd_hash_init_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_init); +} + +static void cryptd_hash_update(struct crypto_async_request *req_async, int err) +{ + struct ahash_request *req = ahash_request_cast(req_async); + struct cryptd_hash_request_ctx *rctx; + + rctx = ahash_request_ctx(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + + err = shash_ahash_update(req, &rctx->desc); + + req->base.complete = rctx->complete; + +out: + cryptd_hash_complete(req, err); +} + +static int cryptd_hash_update_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_update); +} + +static void cryptd_hash_final(struct crypto_async_request *req_async, int err) +{ + struct ahash_request *req = ahash_request_cast(req_async); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + + err = crypto_shash_final(&rctx->desc, req->result); + + req->base.complete = rctx->complete; + +out: + cryptd_hash_complete(req, err); +} + +static int cryptd_hash_final_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_final); +} + +static void cryptd_hash_finup(struct crypto_async_request *req_async, int err) +{ + struct ahash_request *req = ahash_request_cast(req_async); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + + err = shash_ahash_finup(req, &rctx->desc); + + req->base.complete = rctx->complete; + +out: + cryptd_hash_complete(req, err); +} + +static int cryptd_hash_finup_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_finup); +} + +static void cryptd_hash_digest(struct crypto_async_request *req_async, int err) +{ + struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); + struct crypto_shash *child = ctx->child; + struct ahash_request *req = ahash_request_cast(req_async); + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + struct shash_desc *desc = &rctx->desc; + + if (unlikely(err == -EINPROGRESS)) + goto out; + + desc->tfm = child; + + err = shash_ahash_digest(req, desc); + + req->base.complete = rctx->complete; + +out: + cryptd_hash_complete(req, err); +} + +static int cryptd_hash_digest_enqueue(struct ahash_request *req) +{ + return cryptd_hash_enqueue(req, cryptd_hash_digest); +} + +static int cryptd_hash_export(struct ahash_request *req, void *out) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + + return crypto_shash_export(&rctx->desc, out); +} + +static int cryptd_hash_import(struct ahash_request *req, const void *in) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct shash_desc *desc = cryptd_shash_desc(req); + + desc->tfm = ctx->child; + + return crypto_shash_import(desc, in); +} + +static void cryptd_hash_free(struct ahash_instance *inst) +{ + struct hashd_instance_ctx *ctx = ahash_instance_ctx(inst); + + crypto_drop_shash(&ctx->spawn); + kfree(inst); +} + +static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct hashd_instance_ctx *ctx; + struct ahash_instance *inst; + struct shash_alg *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = ahash_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + alg = crypto_spawn_shash_alg(&ctx->spawn); + + err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.halg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL| + CRYPTO_ALG_OPTIONAL_KEY)); + inst->alg.halg.digestsize = alg->digestsize; + inst->alg.halg.statesize = alg->statesize; + inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx); + + inst->alg.halg.base.cra_init = cryptd_hash_init_tfm; + inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm; + + inst->alg.init = cryptd_hash_init_enqueue; + inst->alg.update = cryptd_hash_update_enqueue; + inst->alg.final = cryptd_hash_final_enqueue; + inst->alg.finup = cryptd_hash_finup_enqueue; + inst->alg.export = cryptd_hash_export; + inst->alg.import = cryptd_hash_import; + if (crypto_shash_alg_has_setkey(alg)) + inst->alg.setkey = cryptd_hash_setkey; + inst->alg.digest = cryptd_hash_digest_enqueue; + + inst->free = cryptd_hash_free; + + err = ahash_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_hash_free(inst); + } + return err; +} + +static int cryptd_aead_setkey(struct crypto_aead *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent); + struct crypto_aead *child = ctx->child; + + return crypto_aead_setkey(child, key, keylen); +} + +static int cryptd_aead_setauthsize(struct crypto_aead *parent, + unsigned int authsize) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent); + struct crypto_aead *child = ctx->child; + + return crypto_aead_setauthsize(child, authsize); +} + +static void cryptd_aead_crypt(struct aead_request *req, + struct crypto_aead *child, + int err, + int (*crypt)(struct aead_request *req)) +{ + struct cryptd_aead_request_ctx *rctx; + struct cryptd_aead_ctx *ctx; + crypto_completion_t compl; + struct crypto_aead *tfm; + int refcnt; + + rctx = aead_request_ctx(req); + compl = rctx->complete; + + tfm = crypto_aead_reqtfm(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + aead_request_set_tfm(req, child); + err = crypt( req ); + +out: + ctx = crypto_aead_ctx(tfm); + refcnt = refcount_read(&ctx->refcnt); + + local_bh_disable(); + compl(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt)) + crypto_free_aead(tfm); +} + +static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err) +{ + struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm); + struct crypto_aead *child = ctx->child; + struct aead_request *req; + + req = container_of(areq, struct aead_request, base); + cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt); +} + +static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err) +{ + struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm); + struct crypto_aead *child = ctx->child; + struct aead_request *req; + + req = container_of(areq, struct aead_request, base); + cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt); +} + +static int cryptd_aead_enqueue(struct aead_request *req, + crypto_completion_t compl) +{ + struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req); + struct crypto_aead *tfm = crypto_aead_reqtfm(req); + struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm)); + + rctx->complete = req->base.complete; + req->base.complete = compl; + return cryptd_enqueue_request(queue, &req->base); +} + +static int cryptd_aead_encrypt_enqueue(struct aead_request *req) +{ + return cryptd_aead_enqueue(req, cryptd_aead_encrypt ); +} + +static int cryptd_aead_decrypt_enqueue(struct aead_request *req) +{ + return cryptd_aead_enqueue(req, cryptd_aead_decrypt ); +} + +static int cryptd_aead_init_tfm(struct crypto_aead *tfm) +{ + struct aead_instance *inst = aead_alg_instance(tfm); + struct aead_instance_ctx *ictx = aead_instance_ctx(inst); + struct crypto_aead_spawn *spawn = &ictx->aead_spawn; + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm); + struct crypto_aead *cipher; + + cipher = crypto_spawn_aead(spawn); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + ctx->child = cipher; + crypto_aead_set_reqsize( + tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx), + crypto_aead_reqsize(cipher))); + return 0; +} + +static void cryptd_aead_exit_tfm(struct crypto_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm); + crypto_free_aead(ctx->child); +} + +static void cryptd_aead_free(struct aead_instance *inst) +{ + struct aead_instance_ctx *ctx = aead_instance_ctx(inst); + + crypto_drop_aead(&ctx->aead_spawn); + kfree(inst); +} + +static int cryptd_create_aead(struct crypto_template *tmpl, + struct rtattr **tb, + struct crypto_attr_type *algt, + struct cryptd_queue *queue) +{ + struct aead_instance_ctx *ctx; + struct aead_instance *inst; + struct aead_alg *alg; + u32 type; + u32 mask; + int err; + + cryptd_type_and_mask(algt, &type, &mask); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = aead_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), type, mask); + if (err) + goto err_free_inst; + + alg = crypto_spawn_aead_alg(&ctx->aead_spawn); + err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC | + (alg->base.cra_flags & CRYPTO_ALG_INTERNAL); + inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx); + + inst->alg.ivsize = crypto_aead_alg_ivsize(alg); + inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); + + inst->alg.init = cryptd_aead_init_tfm; + inst->alg.exit = cryptd_aead_exit_tfm; + inst->alg.setkey = cryptd_aead_setkey; + inst->alg.setauthsize = cryptd_aead_setauthsize; + inst->alg.encrypt = cryptd_aead_encrypt_enqueue; + inst->alg.decrypt = cryptd_aead_decrypt_enqueue; + + inst->free = cryptd_aead_free; + + err = aead_register_instance(tmpl, inst); + if (err) { +err_free_inst: + cryptd_aead_free(inst); + } + return err; +} + +static struct cryptd_queue queue; + +static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct crypto_attr_type *algt; + + algt = crypto_get_attr_type(tb); + if (IS_ERR(algt)) + return PTR_ERR(algt); + + switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { + case CRYPTO_ALG_TYPE_SKCIPHER: + return cryptd_create_skcipher(tmpl, tb, algt, &queue); + case CRYPTO_ALG_TYPE_HASH: + return cryptd_create_hash(tmpl, tb, algt, &queue); + case CRYPTO_ALG_TYPE_AEAD: + return cryptd_create_aead(tmpl, tb, algt, &queue); + } + + return -EINVAL; +} + +static struct crypto_template cryptd_tmpl = { + .name = "cryptd", + .create = cryptd_create, + .module = THIS_MODULE, +}; + +struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct cryptd_skcipher_ctx *ctx; + struct crypto_skcipher *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + + tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + + if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { + crypto_free_skcipher(tfm); + return ERR_PTR(-EINVAL); + } + + ctx = crypto_skcipher_ctx(tfm); + refcount_set(&ctx->refcnt, 1); + + return container_of(tfm, struct cryptd_skcipher, base); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher); + +struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base); + + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_skcipher_child); + +bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base); + + return refcount_read(&ctx->refcnt) - 1; +} +EXPORT_SYMBOL_GPL(cryptd_skcipher_queued); + +void cryptd_free_skcipher(struct cryptd_skcipher *tfm) +{ + struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base); + + if (refcount_dec_and_test(&ctx->refcnt)) + crypto_free_skcipher(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_skcipher); + +struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct cryptd_hash_ctx *ctx; + struct crypto_ahash *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { + crypto_free_ahash(tfm); + return ERR_PTR(-EINVAL); + } + + ctx = crypto_ahash_ctx(tfm); + refcount_set(&ctx->refcnt, 1); + + return __cryptd_ahash_cast(tfm); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_ahash); + +struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); + + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_ahash_child); + +struct shash_desc *cryptd_shash_desc(struct ahash_request *req) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + return &rctx->desc; +} +EXPORT_SYMBOL_GPL(cryptd_shash_desc); + +bool cryptd_ahash_queued(struct cryptd_ahash *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); + + return refcount_read(&ctx->refcnt) - 1; +} +EXPORT_SYMBOL_GPL(cryptd_ahash_queued); + +void cryptd_free_ahash(struct cryptd_ahash *tfm) +{ + struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); + + if (refcount_dec_and_test(&ctx->refcnt)) + crypto_free_ahash(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_ahash); + +struct cryptd_aead *cryptd_alloc_aead(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct cryptd_aead_ctx *ctx; + struct crypto_aead *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + tfm = crypto_alloc_aead(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { + crypto_free_aead(tfm); + return ERR_PTR(-EINVAL); + } + + ctx = crypto_aead_ctx(tfm); + refcount_set(&ctx->refcnt, 1); + + return __cryptd_aead_cast(tfm); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_aead); + +struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx; + ctx = crypto_aead_ctx(&tfm->base); + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_aead_child); + +bool cryptd_aead_queued(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base); + + return refcount_read(&ctx->refcnt) - 1; +} +EXPORT_SYMBOL_GPL(cryptd_aead_queued); + +void cryptd_free_aead(struct cryptd_aead *tfm) +{ + struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base); + + if (refcount_dec_and_test(&ctx->refcnt)) + crypto_free_aead(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_aead); + +static int __init cryptd_init(void) +{ + int err; + + cryptd_wq = alloc_workqueue("cryptd", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE, + 1); + if (!cryptd_wq) + return -ENOMEM; + + err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen); + if (err) + goto err_destroy_wq; + + err = crypto_register_template(&cryptd_tmpl); + if (err) + goto err_fini_queue; + + return 0; + +err_fini_queue: + cryptd_fini_queue(&queue); +err_destroy_wq: + destroy_workqueue(cryptd_wq); + return err; +} + +static void __exit cryptd_exit(void) +{ + destroy_workqueue(cryptd_wq); + cryptd_fini_queue(&queue); + crypto_unregister_template(&cryptd_tmpl); +} + +subsys_initcall(cryptd_init); +module_exit(cryptd_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Software async crypto daemon"); +MODULE_ALIAS_CRYPTO("cryptd"); |