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![Huang Ying](/assets/img/avatar_default.png)
Use crypto_alloc_base() instead of crypto_alloc_ablkcipher() to allocate underlying tfm in cryptd_alloc_ablkcipher. Because crypto_alloc_ablkcipher() prefer GENIV encapsulated crypto instead of raw one, while cryptd_alloc_ablkcipher needed the raw one. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
648 lines
17 KiB
C
648 lines
17 KiB
C
/*
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* Software async crypto daemon.
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/hash.h>
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#include <crypto/cryptd.h>
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#include <crypto/crypto_wq.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#define CRYPTD_MAX_CPU_QLEN 100
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struct cryptd_cpu_queue {
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struct crypto_queue queue;
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struct work_struct work;
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};
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struct cryptd_queue {
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struct cryptd_cpu_queue *cpu_queue;
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};
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struct cryptd_instance_ctx {
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struct crypto_spawn spawn;
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struct cryptd_queue *queue;
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};
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struct cryptd_blkcipher_ctx {
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struct crypto_blkcipher *child;
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};
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struct cryptd_blkcipher_request_ctx {
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crypto_completion_t complete;
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};
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struct cryptd_hash_ctx {
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struct crypto_hash *child;
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};
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struct cryptd_hash_request_ctx {
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crypto_completion_t complete;
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};
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static void cryptd_queue_worker(struct work_struct *work);
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static int cryptd_init_queue(struct cryptd_queue *queue,
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unsigned int max_cpu_qlen)
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{
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int cpu;
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struct cryptd_cpu_queue *cpu_queue;
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queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
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if (!queue->cpu_queue)
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return -ENOMEM;
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for_each_possible_cpu(cpu) {
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cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
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crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
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INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
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}
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return 0;
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}
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static void cryptd_fini_queue(struct cryptd_queue *queue)
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{
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int cpu;
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struct cryptd_cpu_queue *cpu_queue;
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for_each_possible_cpu(cpu) {
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cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
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BUG_ON(cpu_queue->queue.qlen);
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}
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free_percpu(queue->cpu_queue);
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}
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static int cryptd_enqueue_request(struct cryptd_queue *queue,
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struct crypto_async_request *request)
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{
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int cpu, err;
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struct cryptd_cpu_queue *cpu_queue;
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cpu = get_cpu();
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cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
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err = crypto_enqueue_request(&cpu_queue->queue, request);
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queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
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put_cpu();
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return err;
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}
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/* Called in workqueue context, do one real cryption work (via
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* req->complete) and reschedule itself if there are more work to
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* do. */
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static void cryptd_queue_worker(struct work_struct *work)
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{
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struct cryptd_cpu_queue *cpu_queue;
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struct crypto_async_request *req, *backlog;
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cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
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/* Only handle one request at a time to avoid hogging crypto
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* workqueue. preempt_disable/enable is used to prevent
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* being preempted by cryptd_enqueue_request() */
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preempt_disable();
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backlog = crypto_get_backlog(&cpu_queue->queue);
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req = crypto_dequeue_request(&cpu_queue->queue);
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preempt_enable();
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if (!req)
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return;
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if (backlog)
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backlog->complete(backlog, -EINPROGRESS);
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req->complete(req, 0);
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if (cpu_queue->queue.qlen)
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queue_work(kcrypto_wq, &cpu_queue->work);
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}
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static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
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return ictx->queue;
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}
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static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
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const u8 *key, unsigned int keylen)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
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struct crypto_blkcipher *child = ctx->child;
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int err;
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crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_blkcipher_setkey(child, key, keylen);
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crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
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struct crypto_blkcipher *child,
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int err,
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int (*crypt)(struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src,
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unsigned int len))
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{
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struct cryptd_blkcipher_request_ctx *rctx;
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struct blkcipher_desc desc;
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rctx = ablkcipher_request_ctx(req);
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if (unlikely(err == -EINPROGRESS))
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goto out;
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desc.tfm = child;
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desc.info = req->info;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypt(&desc, req->dst, req->src, req->nbytes);
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req->base.complete = rctx->complete;
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out:
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local_bh_disable();
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rctx->complete(&req->base, err);
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local_bh_enable();
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}
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static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
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struct crypto_blkcipher *child = ctx->child;
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cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
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crypto_blkcipher_crt(child)->encrypt);
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}
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static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
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struct crypto_blkcipher *child = ctx->child;
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cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
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crypto_blkcipher_crt(child)->decrypt);
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}
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static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
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crypto_completion_t complete)
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{
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struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct cryptd_queue *queue;
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queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
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rctx->complete = req->base.complete;
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req->base.complete = complete;
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return cryptd_enqueue_request(queue, &req->base);
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}
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static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
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{
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return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
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}
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static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
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{
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return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
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}
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static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct crypto_spawn *spawn = &ictx->spawn;
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_blkcipher *cipher;
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cipher = crypto_spawn_blkcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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tfm->crt_ablkcipher.reqsize =
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sizeof(struct cryptd_blkcipher_request_ctx);
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return 0;
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}
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static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
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{
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struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_blkcipher(ctx->child);
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}
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static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
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struct cryptd_queue *queue)
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{
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struct crypto_instance *inst;
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struct cryptd_instance_ctx *ctx;
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int err;
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
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if (!inst) {
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inst = ERR_PTR(-ENOMEM);
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goto out;
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}
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
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goto out_free_inst;
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ctx = crypto_instance_ctx(inst);
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err = crypto_init_spawn(&ctx->spawn, alg, inst,
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CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
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if (err)
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goto out_free_inst;
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ctx->queue = queue;
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memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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inst->alg.cra_priority = alg->cra_priority + 50;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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out:
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return inst;
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out_free_inst:
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kfree(inst);
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inst = ERR_PTR(err);
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goto out;
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}
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static struct crypto_instance *cryptd_alloc_blkcipher(
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struct rtattr **tb, struct cryptd_queue *queue)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
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CRYPTO_ALG_TYPE_MASK);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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inst = cryptd_alloc_instance(alg, queue);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
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inst->alg.cra_type = &crypto_ablkcipher_type;
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inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
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inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
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inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
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inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
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inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
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inst->alg.cra_init = cryptd_blkcipher_init_tfm;
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inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
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inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
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inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
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inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
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struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct crypto_spawn *spawn = &ictx->spawn;
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_hash *cipher;
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cipher = crypto_spawn_hash(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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tfm->crt_ahash.reqsize =
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sizeof(struct cryptd_hash_request_ctx);
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return 0;
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}
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static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
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{
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_hash(ctx->child);
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}
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static int cryptd_hash_setkey(struct crypto_ahash *parent,
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const u8 *key, unsigned int keylen)
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{
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struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent);
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struct crypto_hash *child = ctx->child;
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int err;
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crypto_hash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_hash_set_flags(child, crypto_ahash_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_hash_setkey(child, key, keylen);
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crypto_ahash_set_flags(parent, crypto_hash_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static int cryptd_hash_enqueue(struct ahash_request *req,
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crypto_completion_t complete)
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{
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struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct cryptd_queue *queue =
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cryptd_get_queue(crypto_ahash_tfm(tfm));
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rctx->complete = req->base.complete;
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req->base.complete = complete;
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return cryptd_enqueue_request(queue, &req->base);
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}
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static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
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{
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
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struct crypto_hash *child = ctx->child;
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struct ahash_request *req = ahash_request_cast(req_async);
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struct cryptd_hash_request_ctx *rctx;
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struct hash_desc desc;
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rctx = ahash_request_ctx(req);
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if (unlikely(err == -EINPROGRESS))
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goto out;
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desc.tfm = child;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypto_hash_crt(child)->init(&desc);
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req->base.complete = rctx->complete;
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out:
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local_bh_disable();
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rctx->complete(&req->base, err);
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local_bh_enable();
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}
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static int cryptd_hash_init_enqueue(struct ahash_request *req)
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{
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return cryptd_hash_enqueue(req, cryptd_hash_init);
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}
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static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
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{
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
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struct crypto_hash *child = ctx->child;
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struct ahash_request *req = ahash_request_cast(req_async);
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struct cryptd_hash_request_ctx *rctx;
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struct hash_desc desc;
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rctx = ahash_request_ctx(req);
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if (unlikely(err == -EINPROGRESS))
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goto out;
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desc.tfm = child;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypto_hash_crt(child)->update(&desc,
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req->src,
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req->nbytes);
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req->base.complete = rctx->complete;
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out:
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local_bh_disable();
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rctx->complete(&req->base, err);
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local_bh_enable();
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}
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static int cryptd_hash_update_enqueue(struct ahash_request *req)
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{
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return cryptd_hash_enqueue(req, cryptd_hash_update);
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}
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static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
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{
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
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struct crypto_hash *child = ctx->child;
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struct ahash_request *req = ahash_request_cast(req_async);
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struct cryptd_hash_request_ctx *rctx;
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struct hash_desc desc;
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rctx = ahash_request_ctx(req);
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if (unlikely(err == -EINPROGRESS))
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goto out;
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desc.tfm = child;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypto_hash_crt(child)->final(&desc, req->result);
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req->base.complete = rctx->complete;
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out:
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local_bh_disable();
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rctx->complete(&req->base, err);
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local_bh_enable();
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}
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static int cryptd_hash_final_enqueue(struct ahash_request *req)
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{
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return cryptd_hash_enqueue(req, cryptd_hash_final);
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}
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static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
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{
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struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
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struct crypto_hash *child = ctx->child;
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struct ahash_request *req = ahash_request_cast(req_async);
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struct cryptd_hash_request_ctx *rctx;
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struct hash_desc desc;
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rctx = ahash_request_ctx(req);
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if (unlikely(err == -EINPROGRESS))
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goto out;
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desc.tfm = child;
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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|
|
err = crypto_hash_crt(child)->digest(&desc,
|
|
req->src,
|
|
req->nbytes,
|
|
req->result);
|
|
|
|
req->base.complete = rctx->complete;
|
|
|
|
out:
|
|
local_bh_disable();
|
|
rctx->complete(&req->base, err);
|
|
local_bh_enable();
|
|
}
|
|
|
|
static int cryptd_hash_digest_enqueue(struct ahash_request *req)
|
|
{
|
|
return cryptd_hash_enqueue(req, cryptd_hash_digest);
|
|
}
|
|
|
|
static struct crypto_instance *cryptd_alloc_hash(
|
|
struct rtattr **tb, struct cryptd_queue *queue)
|
|
{
|
|
struct crypto_instance *inst;
|
|
struct crypto_alg *alg;
|
|
|
|
alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
|
|
CRYPTO_ALG_TYPE_HASH_MASK);
|
|
if (IS_ERR(alg))
|
|
return ERR_PTR(PTR_ERR(alg));
|
|
|
|
inst = cryptd_alloc_instance(alg, queue);
|
|
if (IS_ERR(inst))
|
|
goto out_put_alg;
|
|
|
|
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC;
|
|
inst->alg.cra_type = &crypto_ahash_type;
|
|
|
|
inst->alg.cra_ahash.digestsize = alg->cra_hash.digestsize;
|
|
inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
|
|
|
|
inst->alg.cra_init = cryptd_hash_init_tfm;
|
|
inst->alg.cra_exit = cryptd_hash_exit_tfm;
|
|
|
|
inst->alg.cra_ahash.init = cryptd_hash_init_enqueue;
|
|
inst->alg.cra_ahash.update = cryptd_hash_update_enqueue;
|
|
inst->alg.cra_ahash.final = cryptd_hash_final_enqueue;
|
|
inst->alg.cra_ahash.setkey = cryptd_hash_setkey;
|
|
inst->alg.cra_ahash.digest = cryptd_hash_digest_enqueue;
|
|
|
|
out_put_alg:
|
|
crypto_mod_put(alg);
|
|
return inst;
|
|
}
|
|
|
|
static struct cryptd_queue queue;
|
|
|
|
static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
if (IS_ERR(algt))
|
|
return ERR_CAST(algt);
|
|
|
|
switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
|
|
case CRYPTO_ALG_TYPE_BLKCIPHER:
|
|
return cryptd_alloc_blkcipher(tb, &queue);
|
|
case CRYPTO_ALG_TYPE_DIGEST:
|
|
return cryptd_alloc_hash(tb, &queue);
|
|
}
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void cryptd_free(struct crypto_instance *inst)
|
|
{
|
|
struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
|
|
|
|
crypto_drop_spawn(&ctx->spawn);
|
|
kfree(inst);
|
|
}
|
|
|
|
static struct crypto_template cryptd_tmpl = {
|
|
.name = "cryptd",
|
|
.alloc = cryptd_alloc,
|
|
.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 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_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
|
|
type |= CRYPTO_ALG_TYPE_BLKCIPHER;
|
|
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);
|
|
}
|
|
|
|
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);
|
|
|
|
void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
|
|
{
|
|
crypto_free_ablkcipher(&tfm->base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
|
|
|
|
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);
|
|
}
|
|
|
|
module_init(cryptd_init);
|
|
module_exit(cryptd_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Software async crypto daemon");
|