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![Herbert Xu](/assets/img/avatar_default.png)
Use the new crypto_engine_op interface where the callback is stored in the algorithm object. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
653 lines
17 KiB
C
653 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#include <crypto/engine.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/scatterlist.h>
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#include <uapi/linux/virtio_crypto.h>
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#include "virtio_crypto_common.h"
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struct virtio_crypto_skcipher_ctx {
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struct virtio_crypto *vcrypto;
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struct crypto_skcipher *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_skcipher_ctx *skcipher_ctx;
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struct skcipher_request *skcipher_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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struct virtio_crypto_algo {
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uint32_t algonum;
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uint32_t service;
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unsigned int active_devs;
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struct skcipher_engine_alg algo;
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};
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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 void virtio_crypto_skcipher_finalize_req(
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struct virtio_crypto_sym_request *vc_sym_req,
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struct skcipher_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 skcipher_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->skcipher_req;
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virtio_crypto_skcipher_finalize_req(vc_sym_req,
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ablk_req, error);
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}
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}
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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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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_skcipher_init_session(
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struct virtio_crypto_skcipher_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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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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struct virtio_crypto_op_ctrl_req *ctrl;
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struct virtio_crypto_session_input *input;
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struct virtio_crypto_sym_create_session_req *sym_create_session;
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struct virtio_crypto_ctrl_request *vc_ctrl_req;
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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 = kmemdup(key, keylen, GFP_ATOMIC);
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if (!cipher_key)
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return -ENOMEM;
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vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
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if (!vc_ctrl_req) {
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err = -ENOMEM;
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goto out;
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}
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/* Pad ctrl header */
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ctrl = &vc_ctrl_req->ctrl;
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ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
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ctrl->header.algo = cpu_to_le32(alg);
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/* Set the default dataqueue id to 0 */
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ctrl->header.queue_id = 0;
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input = &vc_ctrl_req->input;
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input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
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/* Pad cipher's parameters */
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sym_create_session = &ctrl->u.sym_create_session;
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sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
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sym_create_session->u.cipher.para.algo = ctrl->header.algo;
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sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
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sym_create_session->u.cipher.para.op = cpu_to_le32(op);
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sg_init_one(&outhdr, ctrl, sizeof(*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, input, sizeof(*input));
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sgs[num_out + num_in++] = &inhdr;
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err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
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if (err < 0)
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goto out;
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if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
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pr_err("virtio_crypto: Create session failed status: %u\n",
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le32_to_cpu(input->status));
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err = -EINVAL;
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goto out;
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}
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if (encrypt)
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ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
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else
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ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
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err = 0;
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out:
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kfree(vc_ctrl_req);
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kfree_sensitive(cipher_key);
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return err;
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}
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static int virtio_crypto_alg_skcipher_close_session(
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struct virtio_crypto_skcipher_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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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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struct virtio_crypto_op_ctrl_req *ctrl;
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struct virtio_crypto_inhdr *ctrl_status;
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struct virtio_crypto_ctrl_request *vc_ctrl_req;
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vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
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if (!vc_ctrl_req)
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return -ENOMEM;
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ctrl_status = &vc_ctrl_req->ctrl_status;
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ctrl_status->status = VIRTIO_CRYPTO_ERR;
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/* Pad ctrl header */
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ctrl = &vc_ctrl_req->ctrl;
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ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
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/* Set the default virtqueue id to 0 */
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ctrl->header.queue_id = 0;
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destroy_session = &ctrl->u.destroy_session;
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if (encrypt)
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destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id);
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else
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destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id);
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sg_init_one(&outhdr, ctrl, sizeof(*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, &ctrl_status->status, sizeof(ctrl_status->status));
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sgs[num_out + num_in++] = &status_sg;
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err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
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if (err < 0)
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goto out;
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if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
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pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
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ctrl_status->status, destroy_session->session_id);
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err = -EINVAL;
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goto out;
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}
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err = 0;
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out:
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kfree(vc_ctrl_req);
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return err;
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}
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static int virtio_crypto_alg_skcipher_init_sessions(
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struct virtio_crypto_skcipher_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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return -EINVAL;
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}
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if (virtio_crypto_alg_validate_key(keylen, &alg))
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return -EINVAL;
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/* Create encryption session */
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ret = virtio_crypto_alg_skcipher_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_skcipher_init_session(ctx,
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alg, key, keylen, 0);
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if (ret) {
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virtio_crypto_alg_skcipher_close_session(ctx, 1);
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return ret;
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}
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return 0;
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}
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/* Note: kernel crypto API realization */
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static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *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_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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uint32_t alg;
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int ret;
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ret = virtio_crypto_alg_validate_key(keylen, &alg);
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if (ret)
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return 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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VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
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if (!vcrypto) {
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pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
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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_skcipher_close_session(ctx, 1);
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virtio_crypto_alg_skcipher_close_session(ctx, 0);
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}
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ret = virtio_crypto_alg_skcipher_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
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__virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
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struct skcipher_request *req,
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struct data_queue *data_vq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct virtio_crypto_skcipher_ctx *ctx = vc_sym_req->skcipher_ctx;
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struct virtio_crypto_request *vc_req = &vc_sym_req->base;
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unsigned int ivsize = crypto_skcipher_ivsize(tfm);
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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struct virtio_crypto_op_data_req *req_data;
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int src_nents, dst_nents;
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int err;
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unsigned long flags;
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struct scatterlist outhdr, iv_sg, status_sg, **sgs;
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u64 dst_len;
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unsigned int num_out = 0, num_in = 0;
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int sg_total;
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uint8_t *iv;
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struct scatterlist *sg;
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src_nents = sg_nents_for_len(req->src, req->cryptlen);
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if (src_nents < 0) {
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pr_err("Invalid number of src SG.\n");
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return src_nents;
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}
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dst_nents = sg_nents(req->dst);
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pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n",
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src_nents, dst_nents);
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/* Why 3? outhdr + iv + inhdr */
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sg_total = src_nents + dst_nents + 3;
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sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
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dev_to_node(&vcrypto->vdev->dev));
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if (!sgs)
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return -ENOMEM;
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req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
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dev_to_node(&vcrypto->vdev->dev));
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if (!req_data) {
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kfree(sgs);
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return -ENOMEM;
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}
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vc_req->req_data = req_data;
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vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
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/* Head of operation */
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if (vc_sym_req->encrypt) {
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req_data->header.session_id =
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cpu_to_le64(ctx->enc_sess_info.session_id);
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req_data->header.opcode =
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cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
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} else {
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req_data->header.session_id =
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cpu_to_le64(ctx->dec_sess_info.session_id);
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req_data->header.opcode =
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cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
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}
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req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
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req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
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req_data->u.sym_req.u.cipher.para.src_data_len =
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cpu_to_le32(req->cryptlen);
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dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
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if (unlikely(dst_len > U32_MAX)) {
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pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
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err = -EINVAL;
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goto free;
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}
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dst_len = min_t(unsigned int, req->cryptlen, dst_len);
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pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
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req->cryptlen, dst_len);
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if (unlikely(req->cryptlen + dst_len + ivsize +
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sizeof(vc_req->status) > vcrypto->max_size)) {
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pr_err("virtio_crypto: The length is too big\n");
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err = -EINVAL;
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goto free;
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}
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req_data->u.sym_req.u.cipher.para.dst_data_len =
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cpu_to_le32((uint32_t)dst_len);
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/* Outhdr */
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sg_init_one(&outhdr, req_data, sizeof(*req_data));
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sgs[num_out++] = &outhdr;
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/* IV */
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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 IV
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*/
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iv = kzalloc_node(ivsize, GFP_ATOMIC,
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dev_to_node(&vcrypto->vdev->dev));
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if (!iv) {
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err = -ENOMEM;
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goto free;
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}
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memcpy(iv, req->iv, ivsize);
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if (!vc_sym_req->encrypt)
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scatterwalk_map_and_copy(req->iv, req->src,
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req->cryptlen - AES_BLOCK_SIZE,
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AES_BLOCK_SIZE, 0);
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sg_init_one(&iv_sg, iv, ivsize);
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sgs[num_out++] = &iv_sg;
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vc_sym_req->iv = iv;
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/* Source data */
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for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
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sgs[num_out++] = sg;
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/* Destination data */
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for (sg = req->dst; sg; sg = sg_next(sg))
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sgs[num_out + num_in++] = sg;
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/* Status */
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sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
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sgs[num_out + num_in++] = &status_sg;
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vc_req->sgs = sgs;
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spin_lock_irqsave(&data_vq->lock, flags);
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err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
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num_in, vc_req, GFP_ATOMIC);
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virtqueue_kick(data_vq->vq);
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spin_unlock_irqrestore(&data_vq->lock, flags);
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if (unlikely(err < 0))
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goto free_iv;
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return 0;
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free_iv:
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kfree_sensitive(iv);
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free:
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kfree_sensitive(req_data);
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kfree(sgs);
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return err;
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}
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static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
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struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
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struct virtio_crypto_sym_request *vc_sym_req =
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skcipher_request_ctx(req);
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struct virtio_crypto_request *vc_req = &vc_sym_req->base;
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struct virtio_crypto *vcrypto = ctx->vcrypto;
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/* Use the first data virtqueue as default */
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struct data_queue *data_vq = &vcrypto->data_vq[0];
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if (!req->cryptlen)
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return 0;
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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;
|
|
|
|
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 = {
|
|
.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,
|
|
},
|
|
.algo.op = {
|
|
.do_one_request = virtio_crypto_skcipher_crypt_req,
|
|
},
|
|
} };
|
|
|
|
int virtio_crypto_skcipher_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_engine_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.base.cra_name);
|
|
}
|
|
|
|
unlock:
|
|
mutex_unlock(&algs_lock);
|
|
return ret;
|
|
}
|
|
|
|
void virtio_crypto_skcipher_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_engine_unregister_skcipher(&virtio_crypto_algs[i].algo);
|
|
|
|
virtio_crypto_algs[i].active_devs--;
|
|
}
|
|
|
|
mutex_unlock(&algs_lock);
|
|
}
|