Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
 /* Algorithms supported by virtio crypto device
  *
  * Authors: Gonglei <arei.gonglei@huawei.com>
  *
  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
  */
 
#include <linux/scatterlist.h>
#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <crypto/scatterwalk.h>
#include <linux/atomic.h>
 
#include <uapi/linux/virtio_crypto.h>
#include "virtio_crypto_common.h"
 
 
struct virtio_crypto_skcipher_ctx {
<------>struct crypto_engine_ctx enginectx;
<------>struct virtio_crypto *vcrypto;
<------>struct crypto_skcipher *tfm;
 
<------>struct virtio_crypto_sym_session_info enc_sess_info;
<------>struct virtio_crypto_sym_session_info dec_sess_info;
};
 
struct virtio_crypto_sym_request {
<------>struct virtio_crypto_request base;
 
<------>/* Cipher or aead */
<------>uint32_t type;
<------>struct virtio_crypto_skcipher_ctx *skcipher_ctx;
<------>struct skcipher_request *skcipher_req;
<------>uint8_t *iv;
<------>/* Encryption? */
<------>bool encrypt;
};
 
struct virtio_crypto_algo {
<------>uint32_t algonum;
<------>uint32_t service;
<------>unsigned int active_devs;
<------>struct skcipher_alg algo;
};
 
/*
 * The algs_lock protects the below global virtio_crypto_active_devs
 * and crypto algorithms registion.
 */
static DEFINE_MUTEX(algs_lock);
static void virtio_crypto_skcipher_finalize_req(
<------>struct virtio_crypto_sym_request *vc_sym_req,
<------>struct skcipher_request *req,
<------>int err);
 
static void virtio_crypto_dataq_sym_callback
<------><------>(struct virtio_crypto_request *vc_req, int len)
{
<------>struct virtio_crypto_sym_request *vc_sym_req =
<------><------>container_of(vc_req, struct virtio_crypto_sym_request, base);
<------>struct skcipher_request *ablk_req;
<------>int error;
 
<------>/* Finish the encrypt or decrypt process */
<------>if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
<------><------>switch (vc_req->status) {
<------><------>case VIRTIO_CRYPTO_OK:
<------><------><------>error = 0;
<------><------><------>break;
<------><------>case VIRTIO_CRYPTO_INVSESS:
<------><------>case VIRTIO_CRYPTO_ERR:
<------><------><------>error = -EINVAL;
<------><------><------>break;
<------><------>case VIRTIO_CRYPTO_BADMSG:
<------><------><------>error = -EBADMSG;
<------><------><------>break;
<------><------>default:
<------><------><------>error = -EIO;
<------><------><------>break;
<------><------>}
<------><------>ablk_req = vc_sym_req->skcipher_req;
<------><------>virtio_crypto_skcipher_finalize_req(vc_sym_req,
<------><------><------><------><------><------><------>ablk_req, error);
<------>}
}
 
static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
{
<------>u64 total = 0;
 
<------>for (total = 0; sg; sg = sg_next(sg))
<------><------>total += sg->length;
 
<------>return total;
}
 
static int
virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
{
<------>switch (key_len) {
<------>case AES_KEYSIZE_128:
<------>case AES_KEYSIZE_192:
<------>case AES_KEYSIZE_256:
<------><------>*alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
<------><------>break;
<------>default:
<------><------>return -EINVAL;
<------>}
<------>return 0;
}
 
static int virtio_crypto_alg_skcipher_init_session(
<------><------>struct virtio_crypto_skcipher_ctx *ctx,
<------><------>uint32_t alg, const uint8_t *key,
<------><------>unsigned int keylen,
<------><------>int encrypt)
{
<------>struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
<------>unsigned int tmp;
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
<------>int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
<------>int err;
<------>unsigned int num_out = 0, num_in = 0;
 
<------>/*
<------> * Avoid to do DMA from the stack, switch to using
<------> * dynamically-allocated for the key
<------> */
<------>uint8_t *cipher_key = kmemdup(key, keylen, GFP_ATOMIC);
 
<------>if (!cipher_key)
<------><------>return -ENOMEM;
 
<------>spin_lock(&vcrypto->ctrl_lock);
<------>/* Pad ctrl header */
<------>vcrypto->ctrl.header.opcode =
<------><------>cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
<------>vcrypto->ctrl.header.algo = cpu_to_le32(alg);
<------>/* Set the default dataqueue id to 0 */
<------>vcrypto->ctrl.header.queue_id = 0;
 
<------>vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
<------>/* Pad cipher's parameters */
<------>vcrypto->ctrl.u.sym_create_session.op_type =
<------><------>cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
<------>vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
<------><------>vcrypto->ctrl.header.algo;
<------>vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
<------><------>cpu_to_le32(keylen);
<------>vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
<------><------>cpu_to_le32(op);
 
<------>sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
<------>sgs[num_out++] = &outhdr;
 
<------>/* Set key */
<------>sg_init_one(&key_sg, cipher_key, keylen);
<------>sgs[num_out++] = &key_sg;
 
<------>/* Return status and session id back */
<------>sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
<------>sgs[num_out + num_in++] = &inhdr;
 
<------>err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
<------><------><------><------>num_in, vcrypto, GFP_ATOMIC);
<------>if (err < 0) {
<------><------>spin_unlock(&vcrypto->ctrl_lock);
<------><------>kfree_sensitive(cipher_key);
<------><------>return err;
<------>}
<------>virtqueue_kick(vcrypto->ctrl_vq);
 
<------>/*
<------> * Trapping into the hypervisor, so the request should be
<------> * handled immediately.
<------> */
<------>while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
<------>       !virtqueue_is_broken(vcrypto->ctrl_vq))
<------><------>cpu_relax();
 
<------>if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
<------><------>spin_unlock(&vcrypto->ctrl_lock);
<------><------>pr_err("virtio_crypto: Create session failed status: %u\n",
<------><------><------>le32_to_cpu(vcrypto->input.status));
<------><------>kfree_sensitive(cipher_key);
<------><------>return -EINVAL;
<------>}
 
<------>if (encrypt)
<------><------>ctx->enc_sess_info.session_id =
<------><------><------>le64_to_cpu(vcrypto->input.session_id);
<------>else
<------><------>ctx->dec_sess_info.session_id =
<------><------><------>le64_to_cpu(vcrypto->input.session_id);
 
<------>spin_unlock(&vcrypto->ctrl_lock);
 
<------>kfree_sensitive(cipher_key);
<------>return 0;
}
 
static int virtio_crypto_alg_skcipher_close_session(
<------><------>struct virtio_crypto_skcipher_ctx *ctx,
<------><------>int encrypt)
{
<------>struct scatterlist outhdr, status_sg, *sgs[2];
<------>unsigned int tmp;
<------>struct virtio_crypto_destroy_session_req *destroy_session;
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
<------>int err;
<------>unsigned int num_out = 0, num_in = 0;
 
<------>spin_lock(&vcrypto->ctrl_lock);
<------>vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
<------>/* Pad ctrl header */
<------>vcrypto->ctrl.header.opcode =
<------><------>cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
<------>/* Set the default virtqueue id to 0 */
<------>vcrypto->ctrl.header.queue_id = 0;
 
<------>destroy_session = &vcrypto->ctrl.u.destroy_session;
 
<------>if (encrypt)
<------><------>destroy_session->session_id =
<------><------><------>cpu_to_le64(ctx->enc_sess_info.session_id);
<------>else
<------><------>destroy_session->session_id =
<------><------><------>cpu_to_le64(ctx->dec_sess_info.session_id);
 
<------>sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
<------>sgs[num_out++] = &outhdr;
 
<------>/* Return status and session id back */
<------>sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
<------><------>sizeof(vcrypto->ctrl_status.status));
<------>sgs[num_out + num_in++] = &status_sg;
 
<------>err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
<------><------><------>num_in, vcrypto, GFP_ATOMIC);
<------>if (err < 0) {
<------><------>spin_unlock(&vcrypto->ctrl_lock);
<------><------>return err;
<------>}
<------>virtqueue_kick(vcrypto->ctrl_vq);
 
<------>while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
<------>       !virtqueue_is_broken(vcrypto->ctrl_vq))
<------><------>cpu_relax();
 
<------>if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
<------><------>spin_unlock(&vcrypto->ctrl_lock);
<------><------>pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
<------><------><------>vcrypto->ctrl_status.status,
<------><------><------>destroy_session->session_id);
 
<------><------>return -EINVAL;
<------>}
<------>spin_unlock(&vcrypto->ctrl_lock);
 
<------>return 0;
}
 
static int virtio_crypto_alg_skcipher_init_sessions(
<------><------>struct virtio_crypto_skcipher_ctx *ctx,
<------><------>const uint8_t *key, unsigned int keylen)
{
<------>uint32_t alg;
<------>int ret;
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
 
<------>if (keylen > vcrypto->max_cipher_key_len) {
<------><------>pr_err("virtio_crypto: the key is too long\n");
<------><------>return -EINVAL;
<------>}
 
<------>if (virtio_crypto_alg_validate_key(keylen, &alg))
<------><------>return -EINVAL;
 
<------>/* Create encryption session */
<------>ret = virtio_crypto_alg_skcipher_init_session(ctx,
<------><------><------>alg, key, keylen, 1);
<------>if (ret)
<------><------>return ret;
<------>/* Create decryption session */
<------>ret = virtio_crypto_alg_skcipher_init_session(ctx,
<------><------><------>alg, key, keylen, 0);
<------>if (ret) {
<------><------>virtio_crypto_alg_skcipher_close_session(ctx, 1);
<------><------>return ret;
<------>}
<------>return 0;
}
 
/* Note: kernel crypto API realization */
static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
<------><------><------><------><------> const uint8_t *key,
<------><------><------><------><------> unsigned int keylen)
{
<------>struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
<------>uint32_t alg;
<------>int ret;
 
<------>ret = virtio_crypto_alg_validate_key(keylen, &alg);
<------>if (ret)
<------><------>return ret;
 
<------>if (!ctx->vcrypto) {
<------><------>/* New key */
<------><------>int node = virtio_crypto_get_current_node();
<------><------>struct virtio_crypto *vcrypto =
<------><------><------><------>      virtcrypto_get_dev_node(node,
<------><------><------><------>      VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
<------><------>if (!vcrypto) {
<------><------><------>pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
<------><------><------>return -ENODEV;
<------><------>}
 
<------><------>ctx->vcrypto = vcrypto;
<------>} else {
<------><------>/* Rekeying, we should close the created sessions previously */
<------><------>virtio_crypto_alg_skcipher_close_session(ctx, 1);
<------><------>virtio_crypto_alg_skcipher_close_session(ctx, 0);
<------>}
 
<------>ret = virtio_crypto_alg_skcipher_init_sessions(ctx, key, keylen);
<------>if (ret) {
<------><------>virtcrypto_dev_put(ctx->vcrypto);
<------><------>ctx->vcrypto = NULL;
 
<------><------>return ret;
<------>}
 
<------>return 0;
}
 
static int
__virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
<------><------>struct skcipher_request *req,
<------><------>struct data_queue *data_vq)
{
<------>struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
<------>struct virtio_crypto_skcipher_ctx *ctx = vc_sym_req->skcipher_ctx;
<------>struct virtio_crypto_request *vc_req = &vc_sym_req->base;
<------>unsigned int ivsize = crypto_skcipher_ivsize(tfm);
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
<------>struct virtio_crypto_op_data_req *req_data;
<------>int src_nents, dst_nents;
<------>int err;
<------>unsigned long flags;
<------>struct scatterlist outhdr, iv_sg, status_sg, **sgs;
<------>u64 dst_len;
<------>unsigned int num_out = 0, num_in = 0;
<------>int sg_total;
<------>uint8_t *iv;
<------>struct scatterlist *sg;
 
<------>src_nents = sg_nents_for_len(req->src, req->cryptlen);
<------>if (src_nents < 0) {
<------><------>pr_err("Invalid number of src SG.\n");
<------><------>return src_nents;
<------>}
 
<------>dst_nents = sg_nents(req->dst);
 
<------>pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n",
<------><------><------>src_nents, dst_nents);
 
<------>/* Why 3?  outhdr + iv + inhdr */
<------>sg_total = src_nents + dst_nents + 3;
<------>sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
<------><------><------><------>dev_to_node(&vcrypto->vdev->dev));
<------>if (!sgs)
<------><------>return -ENOMEM;
 
<------>req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
<------><------><------><------>dev_to_node(&vcrypto->vdev->dev));
<------>if (!req_data) {
<------><------>kfree(sgs);
<------><------>return -ENOMEM;
<------>}
 
<------>vc_req->req_data = req_data;
<------>vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
<------>/* Head of operation */
<------>if (vc_sym_req->encrypt) {
<------><------>req_data->header.session_id =
<------><------><------>cpu_to_le64(ctx->enc_sess_info.session_id);
<------><------>req_data->header.opcode =
<------><------><------>cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
<------>} else {
<------><------>req_data->header.session_id =
<------><------><------>cpu_to_le64(ctx->dec_sess_info.session_id);
<------><------>req_data->header.opcode =
<------><------><------>cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
<------>}
<------>req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
<------>req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
<------>req_data->u.sym_req.u.cipher.para.src_data_len =
<------><------><------>cpu_to_le32(req->cryptlen);
 
<------>dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
<------>if (unlikely(dst_len > U32_MAX)) {
<------><------>pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
<------><------>err = -EINVAL;
<------><------>goto free;
<------>}
 
<------>dst_len = min_t(unsigned int, req->cryptlen, dst_len);
<------>pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
<------><------><------>req->cryptlen, dst_len);
 
<------>if (unlikely(req->cryptlen + dst_len + ivsize +
<------><------>sizeof(vc_req->status) > vcrypto->max_size)) {
<------><------>pr_err("virtio_crypto: The length is too big\n");
<------><------>err = -EINVAL;
<------><------>goto free;
<------>}
 
<------>req_data->u.sym_req.u.cipher.para.dst_data_len =
<------><------><------>cpu_to_le32((uint32_t)dst_len);
 
<------>/* Outhdr */
<------>sg_init_one(&outhdr, req_data, sizeof(*req_data));
<------>sgs[num_out++] = &outhdr;
 
<------>/* IV */
 
<------>/*
<------> * Avoid to do DMA from the stack, switch to using
<------> * dynamically-allocated for the IV
<------> */
<------>iv = kzalloc_node(ivsize, GFP_ATOMIC,
<------><------><------><------>dev_to_node(&vcrypto->vdev->dev));
<------>if (!iv) {
<------><------>err = -ENOMEM;
<------><------>goto free;
<------>}
<------>memcpy(iv, req->iv, ivsize);
<------>if (!vc_sym_req->encrypt)
<------><------>scatterwalk_map_and_copy(req->iv, req->src,
<------><------><------><------><------> req->cryptlen - AES_BLOCK_SIZE,
<------><------><------><------><------> AES_BLOCK_SIZE, 0);
 
<------>sg_init_one(&iv_sg, iv, ivsize);
<------>sgs[num_out++] = &iv_sg;
<------>vc_sym_req->iv = iv;
 
<------>/* Source data */
<------>for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
<------><------>sgs[num_out++] = sg;
 
<------>/* Destination data */
<------>for (sg = req->dst; sg; sg = sg_next(sg))
<------><------>sgs[num_out + num_in++] = sg;
 
<------>/* Status */
<------>sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
<------>sgs[num_out + num_in++] = &status_sg;
 
<------>vc_req->sgs = sgs;
 
<------>spin_lock_irqsave(&data_vq->lock, flags);
<------>err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
<------><------><------><------>num_in, vc_req, GFP_ATOMIC);
<------>virtqueue_kick(data_vq->vq);
<------>spin_unlock_irqrestore(&data_vq->lock, flags);
<------>if (unlikely(err < 0))
<------><------>goto free_iv;
 
<------>return 0;
 
free_iv:
<------>kfree_sensitive(iv);
free:
<------>kfree_sensitive(req_data);
<------>kfree(sgs);
<------>return err;
}
 
static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
{
<------>struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
<------>struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
<------>struct virtio_crypto_sym_request *vc_sym_req =
<------><------><------><------>skcipher_request_ctx(req);
<------>struct virtio_crypto_request *vc_req = &vc_sym_req->base;
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
<------>/* Use the first data virtqueue as default */
<------>struct data_queue *data_vq = &vcrypto->data_vq[0];
 
<------>if (!req->cryptlen)
<------><------>return 0;
<------>if (req->cryptlen % AES_BLOCK_SIZE)
<------><------>return -EINVAL;
 
<------>vc_req->dataq = data_vq;
<------>vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
<------>vc_sym_req->skcipher_ctx = ctx;
<------>vc_sym_req->skcipher_req = req;
<------>vc_sym_req->encrypt = true;
 
<------>return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
}
 
static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
{
<------>struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
<------>struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
<------>struct virtio_crypto_sym_request *vc_sym_req =
<------><------><------><------>skcipher_request_ctx(req);
<------>struct virtio_crypto_request *vc_req = &vc_sym_req->base;
<------>struct virtio_crypto *vcrypto = ctx->vcrypto;
<------>/* Use the first data virtqueue as default */
<------>struct data_queue *data_vq = &vcrypto->data_vq[0];
 
<------>if (!req->cryptlen)
<------><------>return 0;
<------>if (req->cryptlen % AES_BLOCK_SIZE)
<------><------>return -EINVAL;
 
<------>vc_req->dataq = data_vq;
<------>vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
<------>vc_sym_req->skcipher_ctx = ctx;
<------>vc_sym_req->skcipher_req = req;
<------>vc_sym_req->encrypt = false;
 
<------>return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
}
 
static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
{
<------>struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 
<------>crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
<------>ctx->tfm = tfm;
 
<------>ctx->enginectx.op.do_one_request = virtio_crypto_skcipher_crypt_req;
<------>ctx->enginectx.op.prepare_request = NULL;
<------>ctx->enginectx.op.unprepare_request = NULL;
<------>return 0;
}
 
static void virtio_crypto_skcipher_exit(struct crypto_skcipher *tfm)
{
<------>struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 
<------>if (!ctx->vcrypto)
<------><------>return;
 
<------>virtio_crypto_alg_skcipher_close_session(ctx, 1);
<------>virtio_crypto_alg_skcipher_close_session(ctx, 0);
<------>virtcrypto_dev_put(ctx->vcrypto);
<------>ctx->vcrypto = NULL;
}
 
int virtio_crypto_skcipher_crypt_req(
<------>struct crypto_engine *engine, void *vreq)
{
<------>struct skcipher_request *req = container_of(vreq, struct skcipher_request, base);
<------>struct virtio_crypto_sym_request *vc_sym_req =
<------><------><------><------>skcipher_request_ctx(req);
<------>struct virtio_crypto_request *vc_req = &vc_sym_req->base;
<------>struct data_queue *data_vq = vc_req->dataq;
<------>int ret;
 
<------>ret = __virtio_crypto_skcipher_do_req(vc_sym_req, req, data_vq);
<------>if (ret < 0)
<------><------>return ret;
 
<------>virtqueue_kick(data_vq->vq);
 
<------>return 0;
}
 
static void virtio_crypto_skcipher_finalize_req(
<------>struct virtio_crypto_sym_request *vc_sym_req,
<------>struct skcipher_request *req,
<------>int err)
{
<------>if (vc_sym_req->encrypt)
<------><------>scatterwalk_map_and_copy(req->iv, req->dst,
<------><------><------><------><------> req->cryptlen - AES_BLOCK_SIZE,
<------><------><------><------><------> AES_BLOCK_SIZE, 0);
<------>kfree_sensitive(vc_sym_req->iv);
<------>virtcrypto_clear_request(&vc_sym_req->base);
 
<------>crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine,
<------><------><------><------><------>   req, err);
}
 
static struct virtio_crypto_algo virtio_crypto_algs[] = { {
<------>.algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
<------>.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
<------>.algo = {
<------><------>.base.cra_name		= "cbc(aes)",
<------><------>.base.cra_driver_name	= "virtio_crypto_aes_cbc",
<------><------>.base.cra_priority	= 150,
<------><------>.base.cra_flags		= CRYPTO_ALG_ASYNC |
<------><------><------><------><------>  CRYPTO_ALG_ALLOCATES_MEMORY,
<------><------>.base.cra_blocksize	= AES_BLOCK_SIZE,
<------><------>.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
<------><------>.base.cra_module	= THIS_MODULE,
<------><------>.init			= virtio_crypto_skcipher_init,
<------><------>.exit			= virtio_crypto_skcipher_exit,
<------><------>.setkey			= virtio_crypto_skcipher_setkey,
<------><------>.decrypt		= virtio_crypto_skcipher_decrypt,
<------><------>.encrypt		= virtio_crypto_skcipher_encrypt,
<------><------>.min_keysize		= AES_MIN_KEY_SIZE,
<------><------>.max_keysize		= AES_MAX_KEY_SIZE,
<------><------>.ivsize			= AES_BLOCK_SIZE,
<------>},
} };
 
int virtio_crypto_algs_register(struct virtio_crypto *vcrypto)
{
<------>int ret = 0;
<------>int i = 0;
 
<------>mutex_lock(&algs_lock);
 
<------>for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
 
<------><------>uint32_t service = virtio_crypto_algs[i].service;
<------><------>uint32_t algonum = virtio_crypto_algs[i].algonum;
 
<------><------>if (!virtcrypto_algo_is_supported(vcrypto, service, algonum))
<------><------><------>continue;
 
<------><------>if (virtio_crypto_algs[i].active_devs == 0) {
<------><------><------>ret = crypto_register_skcipher(&virtio_crypto_algs[i].algo);
<------><------><------>if (ret)
<------><------><------><------>goto unlock;
<------><------>}
 
<------><------>virtio_crypto_algs[i].active_devs++;
<------><------>dev_info(&vcrypto->vdev->dev, "Registered algo %s\n",
<------><------><------> virtio_crypto_algs[i].algo.base.cra_name);
<------>}
 
unlock:
<------>mutex_unlock(&algs_lock);
<------>return ret;
}
 
void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto)
{
<------>int i = 0;
 
<------>mutex_lock(&algs_lock);
 
<------>for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
 
<------><------>uint32_t service = virtio_crypto_algs[i].service;
<------><------>uint32_t algonum = virtio_crypto_algs[i].algonum;
 
<------><------>if (virtio_crypto_algs[i].active_devs == 0 ||
<------><------>    !virtcrypto_algo_is_supported(vcrypto, service, algonum))
<------><------><------>continue;
 
<------><------>if (virtio_crypto_algs[i].active_devs == 1)
<------><------><------>crypto_unregister_skcipher(&virtio_crypto_algs[i].algo);
 
<------><------>virtio_crypto_algs[i].active_devs--;
<------>}
 
<------>mutex_unlock(&algs_lock);
}