diff options
Diffstat (limited to 'crypto/cryptd.c')
| -rw-r--r-- | crypto/cryptd.c | 1401 |
1 files changed, 1401 insertions, 0 deletions
diff --git a/crypto/cryptd.c b/crypto/cryptd.c new file mode 100644 index 000000000..e0c8e907b --- /dev/null +++ b/crypto/cryptd.c @@ -0,0 +1,1401 @@ +/* + * 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. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ + +#include <crypto/internal/hash.h> +#include <crypto/internal/aead.h> +#include <crypto/internal/skcipher.h> +#include <crypto/cryptd.h> +#include <crypto/crypto_wq.h> +#include <linux/atomic.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> + +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"); + +struct cryptd_cpu_queue { + struct crypto_queue queue; + struct work_struct work; +}; + +struct cryptd_queue { + 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_blkcipher_ctx { + atomic_t refcnt; + struct crypto_blkcipher *child; +}; + +struct cryptd_blkcipher_request_ctx { + crypto_completion_t complete; +}; + +struct cryptd_skcipher_ctx { + atomic_t refcnt; + struct crypto_skcipher *child; +}; + +struct cryptd_skcipher_request_ctx { + crypto_completion_t complete; +}; + +struct cryptd_hash_ctx { + atomic_t refcnt; + struct crypto_shash *child; +}; + +struct cryptd_hash_request_ctx { + crypto_completion_t complete; + struct shash_desc desc; +}; + +struct cryptd_aead_ctx { + atomic_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 cpu, err; + struct cryptd_cpu_queue *cpu_queue; + atomic_t *refcnt; + + cpu = get_cpu(); + 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_put_cpu; + + queue_work_on(cpu, kcrypto_wq, &cpu_queue->work); + + if (!atomic_read(refcnt)) + goto out_put_cpu; + + atomic_inc(refcnt); + +out_put_cpu: + put_cpu(); + + 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. + * preempt_disable/enable is used to prevent being preempted by + * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent + * cryptd_enqueue_request() being accessed from software interrupts. + */ + local_bh_disable(); + preempt_disable(); + backlog = crypto_get_backlog(&cpu_queue->queue); + req = crypto_dequeue_request(&cpu_queue->queue); + preempt_enable(); + local_bh_enable(); + + if (!req) + return; + + if (backlog) + backlog->complete(backlog, -EINPROGRESS); + req->complete(req, 0); + + if (cpu_queue->queue.qlen) + queue_work(kcrypto_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 inline void cryptd_check_internal(struct rtattr **tb, u32 *type, + u32 *mask) +{ + struct crypto_attr_type *algt; + + algt = crypto_get_attr_type(tb); + if (IS_ERR(algt)) + return; + + *type |= algt->type & CRYPTO_ALG_INTERNAL; + *mask |= algt->mask & CRYPTO_ALG_INTERNAL; +} + +static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent, + const u8 *key, unsigned int keylen) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent); + struct crypto_blkcipher *child = ctx->child; + int err; + + crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + err = crypto_blkcipher_setkey(child, key, keylen); + crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) & + CRYPTO_TFM_RES_MASK); + return err; +} + +static void cryptd_blkcipher_crypt(struct ablkcipher_request *req, + struct crypto_blkcipher *child, + int err, + int (*crypt)(struct blkcipher_desc *desc, + struct scatterlist *dst, + struct scatterlist *src, + unsigned int len)) +{ + struct cryptd_blkcipher_request_ctx *rctx; + struct cryptd_blkcipher_ctx *ctx; + struct crypto_ablkcipher *tfm; + struct blkcipher_desc desc; + int refcnt; + + rctx = ablkcipher_request_ctx(req); + + if (unlikely(err == -EINPROGRESS)) + goto out; + + desc.tfm = child; + desc.info = req->info; + desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; + + err = crypt(&desc, req->dst, req->src, req->nbytes); + + req->base.complete = rctx->complete; + +out: + tfm = crypto_ablkcipher_reqtfm(req); + ctx = crypto_ablkcipher_ctx(tfm); + refcnt = atomic_read(&ctx->refcnt); + + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt)) + crypto_free_ablkcipher(tfm); +} + +static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); + struct crypto_blkcipher *child = ctx->child; + + cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, + crypto_blkcipher_crt(child)->encrypt); +} + +static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); + struct crypto_blkcipher *child = ctx->child; + + cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, + crypto_blkcipher_crt(child)->decrypt); +} + +static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req, + crypto_completion_t compl) +{ + struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req); + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); + struct cryptd_queue *queue; + + queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm)); + rctx->complete = req->base.complete; + req->base.complete = compl; + + return cryptd_enqueue_request(queue, &req->base); +} + +static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req) +{ + return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt); +} + +static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req) +{ + return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt); +} + +static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm) +{ + struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); + struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); + struct crypto_spawn *spawn = &ictx->spawn; + struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); + struct crypto_blkcipher *cipher; + + cipher = crypto_spawn_blkcipher(spawn); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + ctx->child = cipher; + tfm->crt_ablkcipher.reqsize = + sizeof(struct cryptd_blkcipher_request_ctx); + return 0; +} + +static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); + + crypto_free_blkcipher(ctx->child); +} + +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 void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head, + unsigned int tail) +{ + char *p; + struct crypto_instance *inst; + int err; + + p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL); + if (!p) + return ERR_PTR(-ENOMEM); + + inst = (void *)(p + head); + + err = cryptd_init_instance(inst, alg); + if (err) + goto out_free_inst; + +out: + return p; + +out_free_inst: + kfree(p); + p = ERR_PTR(err); + goto out; +} + +static int cryptd_create_blkcipher(struct crypto_template *tmpl, + struct rtattr **tb, + struct cryptd_queue *queue) +{ + struct cryptd_instance_ctx *ctx; + struct crypto_instance *inst; + struct crypto_alg *alg; + u32 type = CRYPTO_ALG_TYPE_BLKCIPHER; + u32 mask = CRYPTO_ALG_TYPE_MASK; + int err; + + cryptd_check_internal(tb, &type, &mask); + + alg = crypto_get_attr_alg(tb, type, mask); + if (IS_ERR(alg)) + return PTR_ERR(alg); + + inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx)); + err = PTR_ERR(inst); + if (IS_ERR(inst)) + goto out_put_alg; + + ctx = crypto_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_init_spawn(&ctx->spawn, alg, inst, + CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); + if (err) + goto out_free_inst; + + type = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC; + if (alg->cra_flags & CRYPTO_ALG_INTERNAL) + type |= CRYPTO_ALG_INTERNAL; + inst->alg.cra_flags = type; + inst->alg.cra_type = &crypto_ablkcipher_type; + + inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize; + inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize; + inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize; + + inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv; + + inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx); + + inst->alg.cra_init = cryptd_blkcipher_init_tfm; + inst->alg.cra_exit = cryptd_blkcipher_exit_tfm; + + inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey; + inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue; + inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue; + + err = crypto_register_instance(tmpl, inst); + if (err) { + crypto_drop_spawn(&ctx->spawn); +out_free_inst: + kfree(inst); + } + +out_put_alg: + crypto_mod_put(alg); + return err; +} + +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; + int err; + + crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + err = crypto_skcipher_setkey(child, key, keylen); + crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) & + CRYPTO_TFM_RES_MASK); + return err; +} + +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 = atomic_read(&ctx->refcnt); + + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && atomic_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 crypto_skcipher *child = ctx->child; + SKCIPHER_REQUEST_ON_STACK(subreq, 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 crypto_skcipher *child = ctx->child; + SKCIPHER_REQUEST_ON_STACK(subreq, 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)); + 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 cryptd_queue *queue) +{ + struct skcipherd_instance_ctx *ctx; + struct skcipher_instance *inst; + struct skcipher_alg *alg; + const char *name; + u32 type; + u32 mask; + int err; + + type = 0; + mask = CRYPTO_ALG_ASYNC; + + cryptd_check_internal(tb, &type, &mask); + + name = crypto_attr_alg_name(tb[1]); + if (IS_ERR(name)) + return PTR_ERR(name); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = skcipher_instance_ctx(inst); + ctx->queue = queue; + + crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst)); + err = crypto_grab_skcipher(&ctx->spawn, name, type, mask); + if (err) + goto out_free_inst; + + alg = crypto_spawn_skcipher_alg(&ctx->spawn); + err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base); + if (err) + goto out_drop_skcipher; + + 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) { +out_drop_skcipher: + crypto_drop_skcipher(&ctx->spawn); +out_free_inst: + kfree(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; + int err; + + crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) & + CRYPTO_TFM_REQ_MASK); + err = crypto_shash_setkey(child, key, keylen); + crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) & + CRYPTO_TFM_RES_MASK); + return err; +} + +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 = atomic_read(&ctx->refcnt); + + local_bh_disable(); + rctx->complete(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && atomic_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; + desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; + + 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; + desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; + + 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; + desc->flags = req->base.flags; + + return crypto_shash_import(desc, in); +} + +static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, + struct cryptd_queue *queue) +{ + struct hashd_instance_ctx *ctx; + struct ahash_instance *inst; + struct shash_alg *salg; + struct crypto_alg *alg; + u32 type = 0; + u32 mask = 0; + int err; + + cryptd_check_internal(tb, &type, &mask); + + salg = shash_attr_alg(tb[1], type, mask); + if (IS_ERR(salg)) + return PTR_ERR(salg); + + alg = &salg->base; + inst = cryptd_alloc_instance(alg, ahash_instance_headroom(), + sizeof(*ctx)); + err = PTR_ERR(inst); + if (IS_ERR(inst)) + goto out_put_alg; + + ctx = ahash_instance_ctx(inst); + ctx->queue = queue; + + err = crypto_init_shash_spawn(&ctx->spawn, salg, + ahash_crypto_instance(inst)); + if (err) + goto out_free_inst; + + inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC | + (alg->cra_flags & (CRYPTO_ALG_INTERNAL | + CRYPTO_ALG_OPTIONAL_KEY)); + + inst->alg.halg.digestsize = salg->digestsize; + inst->alg.halg.statesize = salg->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(salg)) + inst->alg.setkey = cryptd_hash_setkey; + inst->alg.digest = cryptd_hash_digest_enqueue; + + err = ahash_register_instance(tmpl, inst); + if (err) { + crypto_drop_shash(&ctx->spawn); +out_free_inst: + kfree(inst); + } + +out_put_alg: + crypto_mod_put(alg); + 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 = atomic_read(&ctx->refcnt); + + local_bh_disable(); + compl(&req->base, err); + local_bh_enable(); + + if (err != -EINPROGRESS && refcnt && atomic_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 int cryptd_create_aead(struct crypto_template *tmpl, + struct rtattr **tb, + struct cryptd_queue *queue) +{ + struct aead_instance_ctx *ctx; + struct aead_instance *inst; + struct aead_alg *alg; + const char *name; + u32 type = 0; + u32 mask = CRYPTO_ALG_ASYNC; + int err; + + cryptd_check_internal(tb, &type, &mask); + + name = crypto_attr_alg_name(tb[1]); + if (IS_ERR(name)) + return PTR_ERR(name); + + inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + ctx = aead_instance_ctx(inst); + ctx->queue = queue; + + crypto_set_aead_spawn(&ctx->aead_spawn, aead_crypto_instance(inst)); + err = crypto_grab_aead(&ctx->aead_spawn, name, type, mask); + if (err) + goto out_free_inst; + + alg = crypto_spawn_aead_alg(&ctx->aead_spawn); + err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base); + if (err) + goto out_drop_aead; + + 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; + + err = aead_register_instance(tmpl, inst); + if (err) { +out_drop_aead: + crypto_drop_aead(&ctx->aead_spawn); +out_free_inst: + kfree(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_BLKCIPHER: + if ((algt->type & CRYPTO_ALG_TYPE_MASK) == + CRYPTO_ALG_TYPE_BLKCIPHER) + return cryptd_create_blkcipher(tmpl, tb, &queue); + + return cryptd_create_skcipher(tmpl, tb, &queue); + case CRYPTO_ALG_TYPE_DIGEST: + return cryptd_create_hash(tmpl, tb, &queue); + case CRYPTO_ALG_TYPE_AEAD: + return cryptd_create_aead(tmpl, tb, &queue); + } + + return -EINVAL; +} + +static void cryptd_free(struct crypto_instance *inst) +{ + struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst); + struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst); + struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst); + + switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) { + case CRYPTO_ALG_TYPE_AHASH: + crypto_drop_shash(&hctx->spawn); + kfree(ahash_instance(inst)); + return; + case CRYPTO_ALG_TYPE_AEAD: + crypto_drop_aead(&aead_ctx->aead_spawn); + kfree(aead_instance(inst)); + return; + default: + crypto_drop_spawn(&ctx->spawn); + kfree(inst); + } +} + +static struct crypto_template cryptd_tmpl = { + .name = "cryptd", + .create = cryptd_create, + .free = cryptd_free, + .module = THIS_MODULE, +}; + +struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name, + u32 type, u32 mask) +{ + char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; + struct cryptd_blkcipher_ctx *ctx; + struct crypto_tfm *tfm; + + if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, + "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-EINVAL); + type = crypto_skcipher_type(type); + mask &= ~CRYPTO_ALG_TYPE_MASK; + mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK); + tfm = crypto_alloc_base(cryptd_alg_name, type, mask); + if (IS_ERR(tfm)) + return ERR_CAST(tfm); + if (tfm->__crt_alg->cra_module != THIS_MODULE) { + crypto_free_tfm(tfm); + return ERR_PTR(-EINVAL); + } + + ctx = crypto_tfm_ctx(tfm); + atomic_set(&ctx->refcnt, 1); + + return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm)); +} +EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher); + +struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base); + return ctx->child; +} +EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child); + +bool cryptd_ablkcipher_queued(struct cryptd_ablkcipher *tfm) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base); + + return atomic_read(&ctx->refcnt) - 1; +} +EXPORT_SYMBOL_GPL(cryptd_ablkcipher_queued); + +void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm) +{ + struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base); + + if (atomic_dec_and_test(&ctx->refcnt)) + crypto_free_ablkcipher(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher); + +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); + atomic_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 atomic_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 (atomic_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); + atomic_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 atomic_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 (atomic_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); + atomic_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 atomic_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 (atomic_dec_and_test(&ctx->refcnt)) + crypto_free_aead(&tfm->base); +} +EXPORT_SYMBOL_GPL(cryptd_free_aead); + +static int __init cryptd_init(void) +{ + int err; + + err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen); + if (err) + return err; + + err = crypto_register_template(&cryptd_tmpl); + if (err) + cryptd_fini_queue(&queue); + + return err; +} + +static void __exit cryptd_exit(void) +{ + 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"); |