2016-12-15 10:03:16 +08:00
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/* Algorithms supported by virtio crypto device
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*
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* Authors: Gonglei <arei.gonglei@huawei.com>
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*
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* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/scatterlist.h>
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#include <crypto/algapi.h>
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#include <linux/err.h>
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#include <crypto/scatterwalk.h>
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#include <linux/atomic.h>
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#include <uapi/linux/virtio_crypto.h>
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#include "virtio_crypto_common.h"
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2017-06-23 23:31:19 +08:00
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struct virtio_crypto_ablkcipher_ctx {
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struct virtio_crypto *vcrypto;
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struct crypto_tfm *tfm;
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struct virtio_crypto_sym_session_info enc_sess_info;
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struct virtio_crypto_sym_session_info dec_sess_info;
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};
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struct virtio_crypto_sym_request {
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struct virtio_crypto_request base;
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/* Cipher or aead */
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uint32_t type;
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struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
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struct ablkcipher_request *ablkcipher_req;
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uint8_t *iv;
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/* Encryption? */
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bool encrypt;
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};
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2016-12-15 10:03:16 +08:00
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/*
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* The algs_lock protects the below global virtio_crypto_active_devs
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* and crypto algorithms registion.
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*/
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static DEFINE_MUTEX(algs_lock);
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static unsigned int virtio_crypto_active_devs;
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2017-06-23 23:31:19 +08:00
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static void virtio_crypto_ablkcipher_finalize_req(
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struct virtio_crypto_sym_request *vc_sym_req,
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struct ablkcipher_request *req,
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int err);
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static void virtio_crypto_dataq_sym_callback
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(struct virtio_crypto_request *vc_req, int len)
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{
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struct virtio_crypto_sym_request *vc_sym_req =
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container_of(vc_req, struct virtio_crypto_sym_request, base);
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struct ablkcipher_request *ablk_req;
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int error;
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/* Finish the encrypt or decrypt process */
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if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
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switch (vc_req->status) {
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case VIRTIO_CRYPTO_OK:
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error = 0;
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break;
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case VIRTIO_CRYPTO_INVSESS:
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case VIRTIO_CRYPTO_ERR:
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error = -EINVAL;
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break;
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case VIRTIO_CRYPTO_BADMSG:
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error = -EBADMSG;
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break;
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default:
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error = -EIO;
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break;
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}
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ablk_req = vc_sym_req->ablkcipher_req;
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virtio_crypto_ablkcipher_finalize_req(vc_sym_req,
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ablk_req, error);
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}
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}
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2016-12-15 10:03:16 +08:00
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static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
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{
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u64 total = 0;
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for (total = 0; sg; sg = sg_next(sg))
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total += sg->length;
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return total;
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}
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static int
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virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
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{
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switch (key_len) {
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case AES_KEYSIZE_128:
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case AES_KEYSIZE_192:
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case AES_KEYSIZE_256:
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*alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
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break;
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default:
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pr_err("virtio_crypto: Unsupported key length: %d\n",
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key_len);
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return -EINVAL;
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}
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return 0;
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}
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static int virtio_crypto_alg_ablkcipher_init_session(
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struct virtio_crypto_ablkcipher_ctx *ctx,
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uint32_t alg, const uint8_t *key,
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unsigned int keylen,
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int encrypt)
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{
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struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
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unsigned int tmp;
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
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int err;
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unsigned int num_out = 0, num_in = 0;
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/*
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* Avoid to do DMA from the stack, switch to using
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* dynamically-allocated for the key
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*/
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uint8_t *cipher_key = kmalloc(keylen, GFP_ATOMIC);
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if (!cipher_key)
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return -ENOMEM;
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memcpy(cipher_key, key, keylen);
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spin_lock(&vcrypto->ctrl_lock);
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/* Pad ctrl header */
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vcrypto->ctrl.header.opcode =
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cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
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vcrypto->ctrl.header.algo = cpu_to_le32(alg);
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/* Set the default dataqueue id to 0 */
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vcrypto->ctrl.header.queue_id = 0;
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vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
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/* Pad cipher's parameters */
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vcrypto->ctrl.u.sym_create_session.op_type =
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cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
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vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
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vcrypto->ctrl.header.algo;
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vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
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cpu_to_le32(keylen);
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vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
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cpu_to_le32(op);
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sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
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sgs[num_out++] = &outhdr;
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/* Set key */
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sg_init_one(&key_sg, cipher_key, keylen);
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sgs[num_out++] = &key_sg;
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/* Return status and session id back */
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sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
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sgs[num_out + num_in++] = &inhdr;
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err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
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num_in, vcrypto, GFP_ATOMIC);
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if (err < 0) {
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spin_unlock(&vcrypto->ctrl_lock);
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kzfree(cipher_key);
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return err;
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}
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virtqueue_kick(vcrypto->ctrl_vq);
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/*
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* Trapping into the hypervisor, so the request should be
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* handled immediately.
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*/
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while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
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!virtqueue_is_broken(vcrypto->ctrl_vq))
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cpu_relax();
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if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
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spin_unlock(&vcrypto->ctrl_lock);
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pr_err("virtio_crypto: Create session failed status: %u\n",
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le32_to_cpu(vcrypto->input.status));
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kzfree(cipher_key);
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return -EINVAL;
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}
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if (encrypt)
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ctx->enc_sess_info.session_id =
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le64_to_cpu(vcrypto->input.session_id);
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else
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ctx->dec_sess_info.session_id =
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le64_to_cpu(vcrypto->input.session_id);
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spin_unlock(&vcrypto->ctrl_lock);
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kzfree(cipher_key);
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return 0;
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}
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static int virtio_crypto_alg_ablkcipher_close_session(
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struct virtio_crypto_ablkcipher_ctx *ctx,
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int encrypt)
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{
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struct scatterlist outhdr, status_sg, *sgs[2];
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unsigned int tmp;
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struct virtio_crypto_destroy_session_req *destroy_session;
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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int err;
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unsigned int num_out = 0, num_in = 0;
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spin_lock(&vcrypto->ctrl_lock);
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vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
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/* Pad ctrl header */
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vcrypto->ctrl.header.opcode =
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cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
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/* Set the default virtqueue id to 0 */
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vcrypto->ctrl.header.queue_id = 0;
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destroy_session = &vcrypto->ctrl.u.destroy_session;
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if (encrypt)
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destroy_session->session_id =
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cpu_to_le64(ctx->enc_sess_info.session_id);
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else
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destroy_session->session_id =
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cpu_to_le64(ctx->dec_sess_info.session_id);
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sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
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sgs[num_out++] = &outhdr;
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/* Return status and session id back */
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sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
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sizeof(vcrypto->ctrl_status.status));
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sgs[num_out + num_in++] = &status_sg;
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err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
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num_in, vcrypto, GFP_ATOMIC);
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if (err < 0) {
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spin_unlock(&vcrypto->ctrl_lock);
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return err;
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}
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virtqueue_kick(vcrypto->ctrl_vq);
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while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
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!virtqueue_is_broken(vcrypto->ctrl_vq))
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cpu_relax();
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if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
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spin_unlock(&vcrypto->ctrl_lock);
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pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
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vcrypto->ctrl_status.status,
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destroy_session->session_id);
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return -EINVAL;
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}
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spin_unlock(&vcrypto->ctrl_lock);
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return 0;
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}
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static int virtio_crypto_alg_ablkcipher_init_sessions(
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struct virtio_crypto_ablkcipher_ctx *ctx,
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const uint8_t *key, unsigned int keylen)
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{
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uint32_t alg;
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int ret;
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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if (keylen > vcrypto->max_cipher_key_len) {
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pr_err("virtio_crypto: the key is too long\n");
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goto bad_key;
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}
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if (virtio_crypto_alg_validate_key(keylen, &alg))
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goto bad_key;
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/* Create encryption session */
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ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
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alg, key, keylen, 1);
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if (ret)
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return ret;
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/* Create decryption session */
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ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
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alg, key, keylen, 0);
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if (ret) {
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virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
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return ret;
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}
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return 0;
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bad_key:
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crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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/* Note: kernel crypto API realization */
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static int virtio_crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
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const uint8_t *key,
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unsigned int keylen)
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{
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struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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int ret;
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if (!ctx->vcrypto) {
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/* New key */
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int node = virtio_crypto_get_current_node();
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struct virtio_crypto *vcrypto =
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virtcrypto_get_dev_node(node);
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if (!vcrypto) {
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pr_err("virtio_crypto: Could not find a virtio device in the system");
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return -ENODEV;
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}
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ctx->vcrypto = vcrypto;
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} else {
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/* Rekeying, we should close the created sessions previously */
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virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
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virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
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}
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ret = virtio_crypto_alg_ablkcipher_init_sessions(ctx, key, keylen);
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if (ret) {
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virtcrypto_dev_put(ctx->vcrypto);
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ctx->vcrypto = NULL;
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return ret;
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}
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return 0;
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}
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static int
|
2017-06-23 23:31:19 +08:00
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__virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
|
2016-12-15 10:03:16 +08:00
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struct ablkcipher_request *req,
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2016-12-27 14:49:07 +08:00
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struct data_queue *data_vq)
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2016-12-15 10:03:16 +08:00
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{
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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2017-06-23 23:31:19 +08:00
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struct virtio_crypto_ablkcipher_ctx *ctx = vc_sym_req->ablkcipher_ctx;
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struct virtio_crypto_request *vc_req = &vc_sym_req->base;
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2016-12-15 10:03:16 +08:00
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unsigned int ivsize = crypto_ablkcipher_ivsize(tfm);
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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|
|
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;
|
|
|
|
int i;
|
|
|
|
u64 dst_len;
|
|
|
|
unsigned int num_out = 0, num_in = 0;
|
|
|
|
int sg_total;
|
|
|
|
uint8_t *iv;
|
|
|
|
|
|
|
|
src_nents = sg_nents_for_len(req->src, req->nbytes);
|
|
|
|
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 = kzalloc_node(sg_total * sizeof(*sgs), GFP_ATOMIC,
|
|
|
|
dev_to_node(&vcrypto->vdev->dev));
|
|
|
|
if (!sgs)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
req_data = kzalloc_node(sizeof(*req_data), GFP_ATOMIC,
|
|
|
|
dev_to_node(&vcrypto->vdev->dev));
|
|
|
|
if (!req_data) {
|
|
|
|
kfree(sgs);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
vc_req->req_data = req_data;
|
2017-06-23 23:31:19 +08:00
|
|
|
vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
|
2016-12-15 10:03:16 +08:00
|
|
|
/* Head of operation */
|
2017-06-23 23:31:19 +08:00
|
|
|
if (vc_sym_req->encrypt) {
|
2016-12-15 10:03:16 +08:00
|
|
|
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->nbytes);
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
|
|
|
|
req->nbytes, dst_len);
|
|
|
|
|
|
|
|
if (unlikely(req->nbytes + 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->info, ivsize);
|
|
|
|
sg_init_one(&iv_sg, iv, ivsize);
|
|
|
|
sgs[num_out++] = &iv_sg;
|
2017-06-23 23:31:19 +08:00
|
|
|
vc_sym_req->iv = iv;
|
2016-12-15 10:03:16 +08:00
|
|
|
|
|
|
|
/* Source data */
|
|
|
|
for (i = 0; i < src_nents; i++)
|
|
|
|
sgs[num_out++] = &req->src[i];
|
|
|
|
|
|
|
|
/* Destination data */
|
|
|
|
for (i = 0; i < dst_nents; i++)
|
|
|
|
sgs[num_out + num_in++] = &req->dst[i];
|
|
|
|
|
|
|
|
/* 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:
|
|
|
|
kzfree(iv);
|
|
|
|
free:
|
|
|
|
kzfree(req_data);
|
|
|
|
kfree(sgs);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtio_crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
|
|
|
|
{
|
|
|
|
struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
|
|
|
|
struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
|
2017-06-23 23:31:19 +08:00
|
|
|
struct virtio_crypto_sym_request *vc_sym_req =
|
|
|
|
ablkcipher_request_ctx(req);
|
|
|
|
struct virtio_crypto_request *vc_req = &vc_sym_req->base;
|
2016-12-15 10:03:16 +08:00
|
|
|
struct virtio_crypto *vcrypto = ctx->vcrypto;
|
|
|
|
/* Use the first data virtqueue as default */
|
|
|
|
struct data_queue *data_vq = &vcrypto->data_vq[0];
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
vc_req->dataq = data_vq;
|
2017-06-23 23:31:19 +08:00
|
|
|
vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
|
|
|
|
vc_sym_req->ablkcipher_ctx = ctx;
|
|
|
|
vc_sym_req->ablkcipher_req = req;
|
|
|
|
vc_sym_req->encrypt = true;
|
2016-12-15 10:03:16 +08:00
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
return crypto_transfer_cipher_request_to_engine(data_vq->engine, req);
|
2016-12-15 10:03:16 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int virtio_crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
|
|
|
|
{
|
|
|
|
struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
|
|
|
|
struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
|
2017-06-23 23:31:19 +08:00
|
|
|
struct virtio_crypto_sym_request *vc_sym_req =
|
|
|
|
ablkcipher_request_ctx(req);
|
|
|
|
struct virtio_crypto_request *vc_req = &vc_sym_req->base;
|
2016-12-15 10:03:16 +08:00
|
|
|
struct virtio_crypto *vcrypto = ctx->vcrypto;
|
|
|
|
/* Use the first data virtqueue as default */
|
|
|
|
struct data_queue *data_vq = &vcrypto->data_vq[0];
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
vc_req->dataq = data_vq;
|
2017-06-23 23:31:19 +08:00
|
|
|
vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
|
|
|
|
vc_sym_req->ablkcipher_ctx = ctx;
|
|
|
|
vc_sym_req->ablkcipher_req = req;
|
|
|
|
vc_sym_req->encrypt = false;
|
2016-12-15 10:03:16 +08:00
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
return crypto_transfer_cipher_request_to_engine(data_vq->engine, req);
|
2016-12-15 10:03:16 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int virtio_crypto_ablkcipher_init(struct crypto_tfm *tfm)
|
|
|
|
{
|
|
|
|
struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
|
2017-06-23 23:31:19 +08:00
|
|
|
tfm->crt_ablkcipher.reqsize = sizeof(struct virtio_crypto_sym_request);
|
2016-12-15 10:03:16 +08:00
|
|
|
ctx->tfm = tfm;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtio_crypto_ablkcipher_exit(struct crypto_tfm *tfm)
|
|
|
|
{
|
|
|
|
struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
|
|
|
|
if (!ctx->vcrypto)
|
|
|
|
return;
|
|
|
|
|
|
|
|
virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
|
|
|
|
virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
|
|
|
|
virtcrypto_dev_put(ctx->vcrypto);
|
|
|
|
ctx->vcrypto = NULL;
|
|
|
|
}
|
|
|
|
|
2016-12-27 14:49:07 +08:00
|
|
|
int virtio_crypto_ablkcipher_crypt_req(
|
|
|
|
struct crypto_engine *engine,
|
|
|
|
struct ablkcipher_request *req)
|
|
|
|
{
|
2017-06-23 23:31:19 +08:00
|
|
|
struct virtio_crypto_sym_request *vc_sym_req =
|
|
|
|
ablkcipher_request_ctx(req);
|
|
|
|
struct virtio_crypto_request *vc_req = &vc_sym_req->base;
|
2016-12-27 14:49:07 +08:00
|
|
|
struct data_queue *data_vq = vc_req->dataq;
|
|
|
|
int ret;
|
|
|
|
|
2017-06-23 23:31:19 +08:00
|
|
|
ret = __virtio_crypto_ablkcipher_do_req(vc_sym_req, req, data_vq);
|
2016-12-27 14:49:07 +08:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
virtqueue_kick(data_vq->vq);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-06-23 23:31:19 +08:00
|
|
|
static void virtio_crypto_ablkcipher_finalize_req(
|
|
|
|
struct virtio_crypto_sym_request *vc_sym_req,
|
2016-12-27 14:49:07 +08:00
|
|
|
struct ablkcipher_request *req,
|
|
|
|
int err)
|
|
|
|
{
|
2017-06-23 23:31:19 +08:00
|
|
|
crypto_finalize_cipher_request(vc_sym_req->base.dataq->engine,
|
|
|
|
req, err);
|
|
|
|
kzfree(vc_sym_req->iv);
|
|
|
|
virtcrypto_clear_request(&vc_sym_req->base);
|
2016-12-27 14:49:07 +08:00
|
|
|
}
|
|
|
|
|
2016-12-15 10:03:16 +08:00
|
|
|
static struct crypto_alg virtio_crypto_algs[] = { {
|
|
|
|
.cra_name = "cbc(aes)",
|
|
|
|
.cra_driver_name = "virtio_crypto_aes_cbc",
|
2017-01-13 17:34:16 +08:00
|
|
|
.cra_priority = 150,
|
2016-12-15 10:03:16 +08:00
|
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
|
|
.cra_ctxsize = sizeof(struct virtio_crypto_ablkcipher_ctx),
|
|
|
|
.cra_alignmask = 0,
|
|
|
|
.cra_module = THIS_MODULE,
|
|
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
|
|
.cra_init = virtio_crypto_ablkcipher_init,
|
|
|
|
.cra_exit = virtio_crypto_ablkcipher_exit,
|
|
|
|
.cra_u = {
|
|
|
|
.ablkcipher = {
|
|
|
|
.setkey = virtio_crypto_ablkcipher_setkey,
|
|
|
|
.decrypt = virtio_crypto_ablkcipher_decrypt,
|
|
|
|
.encrypt = virtio_crypto_ablkcipher_encrypt,
|
|
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
|
|
},
|
|
|
|
},
|
|
|
|
} };
|
|
|
|
|
|
|
|
int virtio_crypto_algs_register(void)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
mutex_lock(&algs_lock);
|
|
|
|
if (++virtio_crypto_active_devs != 1)
|
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
ret = crypto_register_algs(virtio_crypto_algs,
|
|
|
|
ARRAY_SIZE(virtio_crypto_algs));
|
|
|
|
if (ret)
|
|
|
|
virtio_crypto_active_devs--;
|
|
|
|
|
|
|
|
unlock:
|
|
|
|
mutex_unlock(&algs_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void virtio_crypto_algs_unregister(void)
|
|
|
|
{
|
|
|
|
mutex_lock(&algs_lock);
|
|
|
|
if (--virtio_crypto_active_devs != 0)
|
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
crypto_unregister_algs(virtio_crypto_algs,
|
|
|
|
ARRAY_SIZE(virtio_crypto_algs));
|
|
|
|
|
|
|
|
unlock:
|
|
|
|
mutex_unlock(&algs_lock);
|
|
|
|
}
|