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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 { local_lock_t bh_lock; 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 { struct skcipher_request req;};
struct cryptd_hash_ctx { refcount_t refcnt; struct crypto_shash *child;};
struct cryptd_hash_request_ctx { crypto_completion_t complete; void *data; struct shash_desc desc;};
struct cryptd_aead_ctx { refcount_t refcnt; struct crypto_aead *child;};
struct cryptd_aead_request_ctx { struct aead_request req;};
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); local_lock_init(&cpu_queue->bh_lock); } 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(); local_lock_nested_bh(&queue->cpu_queue->bh_lock); 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_unlock_nested_bh(&queue->cpu_queue->bh_lock); 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(); __local_lock_nested_bh(&cpu_queue->bh_lock); backlog = crypto_get_backlog(&cpu_queue->queue); req = crypto_dequeue_request(&cpu_queue->queue); __local_unlock_nested_bh(&cpu_queue->bh_lock); local_bh_enable();
if (!req) return;
if (backlog) crypto_request_complete(backlog, -EINPROGRESS); crypto_request_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 struct skcipher_request *cryptd_skcipher_prepare( struct skcipher_request *req, int err){ struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq = &rctx->req; struct cryptd_skcipher_ctx *ctx; struct crypto_skcipher *child;
req->base.complete = subreq->base.complete; req->base.data = subreq->base.data;
if (unlikely(err == -EINPROGRESS)) return NULL;
ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); child = ctx->child;
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);
return subreq;}
static void cryptd_skcipher_complete(struct skcipher_request *req, int err, crypto_completion_t complete){ 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; int refcnt = refcount_read(&ctx->refcnt);
local_bh_disable(); skcipher_request_complete(req, err); local_bh_enable();
if (unlikely(err == -EINPROGRESS)) { subreq->base.complete = req->base.complete; subreq->base.data = req->base.data; req->base.complete = complete; req->base.data = req; } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) crypto_free_skcipher(tfm);}
static void cryptd_skcipher_encrypt(void *data, int err){ struct skcipher_request *req = data; struct skcipher_request *subreq;
subreq = cryptd_skcipher_prepare(req, err); if (likely(subreq)) err = crypto_skcipher_encrypt(subreq);
cryptd_skcipher_complete(req, err, cryptd_skcipher_encrypt);}
static void cryptd_skcipher_decrypt(void *data, int err){ struct skcipher_request *req = data; struct skcipher_request *subreq;
subreq = cryptd_skcipher_prepare(req, err); if (likely(subreq)) err = crypto_skcipher_decrypt(subreq);
cryptd_skcipher_complete(req, err, cryptd_skcipher_decrypt);}
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 skcipher_request *subreq = &rctx->req; struct cryptd_queue *queue;
queue = cryptd_get_queue(crypto_skcipher_tfm(tfm)); subreq->base.complete = req->base.complete; subreq->base.data = req->base.data; req->base.complete = compl; req->base.data = req;
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_common *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_common(&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 = alg->ivsize; inst->alg.chunksize = alg->chunksize; inst->alg.min_keysize = alg->min_keysize; inst->alg.max_keysize = alg->max_keysize;
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_ahash *tfm){ struct ahash_instance *inst = ahash_alg_instance(tfm); struct hashd_instance_ctx *ictx = ahash_instance_ctx(inst); struct crypto_shash_spawn *spawn = &ictx->spawn; struct cryptd_hash_ctx *ctx = crypto_ahash_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(tfm, sizeof(struct cryptd_hash_request_ctx) + crypto_shash_descsize(hash)); return 0;}
static void cryptd_hash_exit_tfm(struct crypto_ahash *tfm){ struct cryptd_hash_ctx *ctx = crypto_ahash_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; rctx->data = req->base.data; req->base.complete = compl; req->base.data = req;
return cryptd_enqueue_request(queue, &req->base);}
static struct shash_desc *cryptd_hash_prepare(struct ahash_request *req, int err){ struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
req->base.complete = rctx->complete; req->base.data = rctx->data;
if (unlikely(err == -EINPROGRESS)) return NULL;
return &rctx->desc;}
static void cryptd_hash_complete(struct ahash_request *req, int err, crypto_completion_t complete){ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); int refcnt = refcount_read(&ctx->refcnt);
local_bh_disable(); ahash_request_complete(req, err); local_bh_enable();
if (err == -EINPROGRESS) { req->base.complete = complete; req->base.data = req; } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) crypto_free_ahash(tfm);}
static void cryptd_hash_init(void *data, int err){ struct ahash_request *req = data; struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); struct crypto_shash *child = ctx->child; struct shash_desc *desc;
desc = cryptd_hash_prepare(req, err); if (unlikely(!desc)) goto out;
desc->tfm = child;
err = crypto_shash_init(desc);
out: cryptd_hash_complete(req, err, cryptd_hash_init);}
static int cryptd_hash_init_enqueue(struct ahash_request *req){ return cryptd_hash_enqueue(req, cryptd_hash_init);}
static void cryptd_hash_update(void *data, int err){ struct ahash_request *req = data; struct shash_desc *desc;
desc = cryptd_hash_prepare(req, err); if (likely(desc)) err = shash_ahash_update(req, desc);
cryptd_hash_complete(req, err, cryptd_hash_update);}
static int cryptd_hash_update_enqueue(struct ahash_request *req){ return cryptd_hash_enqueue(req, cryptd_hash_update);}
static void cryptd_hash_final(void *data, int err){ struct ahash_request *req = data; struct shash_desc *desc;
desc = cryptd_hash_prepare(req, err); if (likely(desc)) err = crypto_shash_final(desc, req->result);
cryptd_hash_complete(req, err, cryptd_hash_final);}
static int cryptd_hash_final_enqueue(struct ahash_request *req){ return cryptd_hash_enqueue(req, cryptd_hash_final);}
static void cryptd_hash_finup(void *data, int err){ struct ahash_request *req = data; struct shash_desc *desc;
desc = cryptd_hash_prepare(req, err); if (likely(desc)) err = shash_ahash_finup(req, desc);
cryptd_hash_complete(req, err, cryptd_hash_finup);}
static int cryptd_hash_finup_enqueue(struct ahash_request *req){ return cryptd_hash_enqueue(req, cryptd_hash_finup);}
static void cryptd_hash_digest(void *data, int err){ struct ahash_request *req = data; struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm); struct crypto_shash *child = ctx->child; struct shash_desc *desc;
desc = cryptd_hash_prepare(req, err); if (unlikely(!desc)) goto out;
desc->tfm = child;
err = shash_ahash_digest(req, desc);
out: cryptd_hash_complete(req, err, cryptd_hash_digest);}
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 cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); struct shash_desc *desc = &rctx->desc;
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.init_tfm = cryptd_hash_init_tfm; inst->alg.exit_tfm = 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), crypto_completion_t compl){ struct cryptd_aead_request_ctx *rctx; struct aead_request *subreq; struct cryptd_aead_ctx *ctx; struct crypto_aead *tfm; int refcnt;
rctx = aead_request_ctx(req); subreq = &rctx->req; req->base.complete = subreq->base.complete; req->base.data = subreq->base.data;
tfm = crypto_aead_reqtfm(req);
if (unlikely(err == -EINPROGRESS)) goto out;
aead_request_set_tfm(subreq, child); aead_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL); aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, req->iv); aead_request_set_ad(subreq, req->assoclen);
err = crypt(subreq);
out: ctx = crypto_aead_ctx(tfm); refcnt = refcount_read(&ctx->refcnt);
local_bh_disable(); aead_request_complete(req, err); local_bh_enable();
if (err == -EINPROGRESS) { subreq->base.complete = req->base.complete; subreq->base.data = req->base.data; req->base.complete = compl; req->base.data = req; } else if (refcnt && refcount_dec_and_test(&ctx->refcnt)) crypto_free_aead(tfm);}
static void cryptd_aead_encrypt(void *data, int err){ struct aead_request *req = data; struct cryptd_aead_ctx *ctx; struct crypto_aead *child;
ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); child = ctx->child; cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt, cryptd_aead_encrypt);}
static void cryptd_aead_decrypt(void *data, int err){ struct aead_request *req = data; struct cryptd_aead_ctx *ctx; struct crypto_aead *child;
ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); child = ctx->child; cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt, cryptd_aead_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)); struct aead_request *subreq = &rctx->req;
subreq->base.complete = req->base.complete; subreq->base.data = req->base.data; req->base.complete = compl; req->base.data = req; 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, 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_LSKCIPHER: 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_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 | WQ_PERCPU, 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);}
module_init(cryptd_init);module_exit(cryptd_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Software async crypto daemon");MODULE_ALIAS_CRYPTO("cryptd");