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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Software async crypto daemon.
- *
- * Copyright (c) 2006 Herbert Xu <[email protected]>
- *
- * Added AEAD support to cryptd.
- * Authors: Tadeusz Struk ([email protected])
- * Adrian Hoban <[email protected]>
- * Gabriele Paoloni <[email protected]>
- * Aidan O'Mahony ([email protected])
- * 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");
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