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21#include <linux/scatterlist.h>
22#include <crypto/algapi.h>
23#include <linux/err.h>
24#include <crypto/scatterwalk.h>
25#include <linux/atomic.h>
26
27#include <uapi/linux/virtio_crypto.h>
28#include "virtio_crypto_common.h"
29
30
31struct virtio_crypto_ablkcipher_ctx {
32 struct virtio_crypto *vcrypto;
33 struct crypto_tfm *tfm;
34
35 struct virtio_crypto_sym_session_info enc_sess_info;
36 struct virtio_crypto_sym_session_info dec_sess_info;
37};
38
39struct virtio_crypto_sym_request {
40 struct virtio_crypto_request base;
41
42
43 uint32_t type;
44 struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
45 struct ablkcipher_request *ablkcipher_req;
46 uint8_t *iv;
47
48 bool encrypt;
49};
50
51
52
53
54
55static DEFINE_MUTEX(algs_lock);
56static unsigned int virtio_crypto_active_devs;
57static void virtio_crypto_ablkcipher_finalize_req(
58 struct virtio_crypto_sym_request *vc_sym_req,
59 struct ablkcipher_request *req,
60 int err);
61
62static void virtio_crypto_dataq_sym_callback
63 (struct virtio_crypto_request *vc_req, int len)
64{
65 struct virtio_crypto_sym_request *vc_sym_req =
66 container_of(vc_req, struct virtio_crypto_sym_request, base);
67 struct ablkcipher_request *ablk_req;
68 int error;
69
70
71 if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
72 switch (vc_req->status) {
73 case VIRTIO_CRYPTO_OK:
74 error = 0;
75 break;
76 case VIRTIO_CRYPTO_INVSESS:
77 case VIRTIO_CRYPTO_ERR:
78 error = -EINVAL;
79 break;
80 case VIRTIO_CRYPTO_BADMSG:
81 error = -EBADMSG;
82 break;
83 default:
84 error = -EIO;
85 break;
86 }
87 ablk_req = vc_sym_req->ablkcipher_req;
88 virtio_crypto_ablkcipher_finalize_req(vc_sym_req,
89 ablk_req, error);
90 }
91}
92
93static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
94{
95 u64 total = 0;
96
97 for (total = 0; sg; sg = sg_next(sg))
98 total += sg->length;
99
100 return total;
101}
102
103static int
104virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
105{
106 switch (key_len) {
107 case AES_KEYSIZE_128:
108 case AES_KEYSIZE_192:
109 case AES_KEYSIZE_256:
110 *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
111 break;
112 default:
113 pr_err("virtio_crypto: Unsupported key length: %d\n",
114 key_len);
115 return -EINVAL;
116 }
117 return 0;
118}
119
120static int virtio_crypto_alg_ablkcipher_init_session(
121 struct virtio_crypto_ablkcipher_ctx *ctx,
122 uint32_t alg, const uint8_t *key,
123 unsigned int keylen,
124 int encrypt)
125{
126 struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
127 unsigned int tmp;
128 struct virtio_crypto *vcrypto = ctx->vcrypto;
129 int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
130 int err;
131 unsigned int num_out = 0, num_in = 0;
132
133
134
135
136
137 uint8_t *cipher_key = kmalloc(keylen, GFP_ATOMIC);
138
139 if (!cipher_key)
140 return -ENOMEM;
141
142 memcpy(cipher_key, key, keylen);
143
144 spin_lock(&vcrypto->ctrl_lock);
145
146 vcrypto->ctrl.header.opcode =
147 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
148 vcrypto->ctrl.header.algo = cpu_to_le32(alg);
149
150 vcrypto->ctrl.header.queue_id = 0;
151
152 vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
153
154 vcrypto->ctrl.u.sym_create_session.op_type =
155 cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
156 vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
157 vcrypto->ctrl.header.algo;
158 vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
159 cpu_to_le32(keylen);
160 vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
161 cpu_to_le32(op);
162
163 sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
164 sgs[num_out++] = &outhdr;
165
166
167 sg_init_one(&key_sg, cipher_key, keylen);
168 sgs[num_out++] = &key_sg;
169
170
171 sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
172 sgs[num_out + num_in++] = &inhdr;
173
174 err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
175 num_in, vcrypto, GFP_ATOMIC);
176 if (err < 0) {
177 spin_unlock(&vcrypto->ctrl_lock);
178 kzfree(cipher_key);
179 return err;
180 }
181 virtqueue_kick(vcrypto->ctrl_vq);
182
183
184
185
186
187 while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
188 !virtqueue_is_broken(vcrypto->ctrl_vq))
189 cpu_relax();
190
191 if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
192 spin_unlock(&vcrypto->ctrl_lock);
193 pr_err("virtio_crypto: Create session failed status: %u\n",
194 le32_to_cpu(vcrypto->input.status));
195 kzfree(cipher_key);
196 return -EINVAL;
197 }
198
199 if (encrypt)
200 ctx->enc_sess_info.session_id =
201 le64_to_cpu(vcrypto->input.session_id);
202 else
203 ctx->dec_sess_info.session_id =
204 le64_to_cpu(vcrypto->input.session_id);
205
206 spin_unlock(&vcrypto->ctrl_lock);
207
208 kzfree(cipher_key);
209 return 0;
210}
211
212static int virtio_crypto_alg_ablkcipher_close_session(
213 struct virtio_crypto_ablkcipher_ctx *ctx,
214 int encrypt)
215{
216 struct scatterlist outhdr, status_sg, *sgs[2];
217 unsigned int tmp;
218 struct virtio_crypto_destroy_session_req *destroy_session;
219 struct virtio_crypto *vcrypto = ctx->vcrypto;
220 int err;
221 unsigned int num_out = 0, num_in = 0;
222
223 spin_lock(&vcrypto->ctrl_lock);
224 vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
225
226 vcrypto->ctrl.header.opcode =
227 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
228
229 vcrypto->ctrl.header.queue_id = 0;
230
231 destroy_session = &vcrypto->ctrl.u.destroy_session;
232
233 if (encrypt)
234 destroy_session->session_id =
235 cpu_to_le64(ctx->enc_sess_info.session_id);
236 else
237 destroy_session->session_id =
238 cpu_to_le64(ctx->dec_sess_info.session_id);
239
240 sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
241 sgs[num_out++] = &outhdr;
242
243
244 sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
245 sizeof(vcrypto->ctrl_status.status));
246 sgs[num_out + num_in++] = &status_sg;
247
248 err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
249 num_in, vcrypto, GFP_ATOMIC);
250 if (err < 0) {
251 spin_unlock(&vcrypto->ctrl_lock);
252 return err;
253 }
254 virtqueue_kick(vcrypto->ctrl_vq);
255
256 while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
257 !virtqueue_is_broken(vcrypto->ctrl_vq))
258 cpu_relax();
259
260 if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
261 spin_unlock(&vcrypto->ctrl_lock);
262 pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
263 vcrypto->ctrl_status.status,
264 destroy_session->session_id);
265
266 return -EINVAL;
267 }
268 spin_unlock(&vcrypto->ctrl_lock);
269
270 return 0;
271}
272
273static int virtio_crypto_alg_ablkcipher_init_sessions(
274 struct virtio_crypto_ablkcipher_ctx *ctx,
275 const uint8_t *key, unsigned int keylen)
276{
277 uint32_t alg;
278 int ret;
279 struct virtio_crypto *vcrypto = ctx->vcrypto;
280
281 if (keylen > vcrypto->max_cipher_key_len) {
282 pr_err("virtio_crypto: the key is too long\n");
283 goto bad_key;
284 }
285
286 if (virtio_crypto_alg_validate_key(keylen, &alg))
287 goto bad_key;
288
289
290 ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
291 alg, key, keylen, 1);
292 if (ret)
293 return ret;
294
295 ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
296 alg, key, keylen, 0);
297 if (ret) {
298 virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
299 return ret;
300 }
301 return 0;
302
303bad_key:
304 crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
305 return -EINVAL;
306}
307
308
309static int virtio_crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
310 const uint8_t *key,
311 unsigned int keylen)
312{
313 struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm);
314 int ret;
315
316 if (!ctx->vcrypto) {
317
318 int node = virtio_crypto_get_current_node();
319 struct virtio_crypto *vcrypto =
320 virtcrypto_get_dev_node(node);
321 if (!vcrypto) {
322 pr_err("virtio_crypto: Could not find a virtio device in the system");
323 return -ENODEV;
324 }
325
326 ctx->vcrypto = vcrypto;
327 } else {
328
329 virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
330 virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
331 }
332
333 ret = virtio_crypto_alg_ablkcipher_init_sessions(ctx, key, keylen);
334 if (ret) {
335 virtcrypto_dev_put(ctx->vcrypto);
336 ctx->vcrypto = NULL;
337
338 return ret;
339 }
340
341 return 0;
342}
343
344static int
345__virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
346 struct ablkcipher_request *req,
347 struct data_queue *data_vq)
348{
349 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
350 struct virtio_crypto_ablkcipher_ctx *ctx = vc_sym_req->ablkcipher_ctx;
351 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
352 unsigned int ivsize = crypto_ablkcipher_ivsize(tfm);
353 struct virtio_crypto *vcrypto = ctx->vcrypto;
354 struct virtio_crypto_op_data_req *req_data;
355 int src_nents, dst_nents;
356 int err;
357 unsigned long flags;
358 struct scatterlist outhdr, iv_sg, status_sg, **sgs;
359 int i;
360 u64 dst_len;
361 unsigned int num_out = 0, num_in = 0;
362 int sg_total;
363 uint8_t *iv;
364
365 src_nents = sg_nents_for_len(req->src, req->nbytes);
366 dst_nents = sg_nents(req->dst);
367
368 pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n",
369 src_nents, dst_nents);
370
371
372 sg_total = src_nents + dst_nents + 3;
373 sgs = kzalloc_node(sg_total * sizeof(*sgs), GFP_ATOMIC,
374 dev_to_node(&vcrypto->vdev->dev));
375 if (!sgs)
376 return -ENOMEM;
377
378 req_data = kzalloc_node(sizeof(*req_data), GFP_ATOMIC,
379 dev_to_node(&vcrypto->vdev->dev));
380 if (!req_data) {
381 kfree(sgs);
382 return -ENOMEM;
383 }
384
385 vc_req->req_data = req_data;
386 vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
387
388 if (vc_sym_req->encrypt) {
389 req_data->header.session_id =
390 cpu_to_le64(ctx->enc_sess_info.session_id);
391 req_data->header.opcode =
392 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
393 } else {
394 req_data->header.session_id =
395 cpu_to_le64(ctx->dec_sess_info.session_id);
396 req_data->header.opcode =
397 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
398 }
399 req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
400 req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
401 req_data->u.sym_req.u.cipher.para.src_data_len =
402 cpu_to_le32(req->nbytes);
403
404 dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
405 if (unlikely(dst_len > U32_MAX)) {
406 pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
407 err = -EINVAL;
408 goto free;
409 }
410
411 pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
412 req->nbytes, dst_len);
413
414 if (unlikely(req->nbytes + dst_len + ivsize +
415 sizeof(vc_req->status) > vcrypto->max_size)) {
416 pr_err("virtio_crypto: The length is too big\n");
417 err = -EINVAL;
418 goto free;
419 }
420
421 req_data->u.sym_req.u.cipher.para.dst_data_len =
422 cpu_to_le32((uint32_t)dst_len);
423
424
425 sg_init_one(&outhdr, req_data, sizeof(*req_data));
426 sgs[num_out++] = &outhdr;
427
428
429
430
431
432
433
434 iv = kzalloc_node(ivsize, GFP_ATOMIC,
435 dev_to_node(&vcrypto->vdev->dev));
436 if (!iv) {
437 err = -ENOMEM;
438 goto free;
439 }
440 memcpy(iv, req->info, ivsize);
441 sg_init_one(&iv_sg, iv, ivsize);
442 sgs[num_out++] = &iv_sg;
443 vc_sym_req->iv = iv;
444
445
446 for (i = 0; i < src_nents; i++)
447 sgs[num_out++] = &req->src[i];
448
449
450 for (i = 0; i < dst_nents; i++)
451 sgs[num_out + num_in++] = &req->dst[i];
452
453
454 sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
455 sgs[num_out + num_in++] = &status_sg;
456
457 vc_req->sgs = sgs;
458
459 spin_lock_irqsave(&data_vq->lock, flags);
460 err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
461 num_in, vc_req, GFP_ATOMIC);
462 virtqueue_kick(data_vq->vq);
463 spin_unlock_irqrestore(&data_vq->lock, flags);
464 if (unlikely(err < 0))
465 goto free_iv;
466
467 return 0;
468
469free_iv:
470 kzfree(iv);
471free:
472 kzfree(req_data);
473 kfree(sgs);
474 return err;
475}
476
477static int virtio_crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
478{
479 struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
480 struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
481 struct virtio_crypto_sym_request *vc_sym_req =
482 ablkcipher_request_ctx(req);
483 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
484 struct virtio_crypto *vcrypto = ctx->vcrypto;
485
486 struct data_queue *data_vq = &vcrypto->data_vq[0];
487
488 vc_req->dataq = data_vq;
489 vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
490 vc_sym_req->ablkcipher_ctx = ctx;
491 vc_sym_req->ablkcipher_req = req;
492 vc_sym_req->encrypt = true;
493
494 return crypto_transfer_cipher_request_to_engine(data_vq->engine, req);
495}
496
497static int virtio_crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
498{
499 struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
500 struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
501 struct virtio_crypto_sym_request *vc_sym_req =
502 ablkcipher_request_ctx(req);
503 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
504 struct virtio_crypto *vcrypto = ctx->vcrypto;
505
506 struct data_queue *data_vq = &vcrypto->data_vq[0];
507
508 vc_req->dataq = data_vq;
509 vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
510 vc_sym_req->ablkcipher_ctx = ctx;
511 vc_sym_req->ablkcipher_req = req;
512 vc_sym_req->encrypt = false;
513
514 return crypto_transfer_cipher_request_to_engine(data_vq->engine, req);
515}
516
517static int virtio_crypto_ablkcipher_init(struct crypto_tfm *tfm)
518{
519 struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
520
521 tfm->crt_ablkcipher.reqsize = sizeof(struct virtio_crypto_sym_request);
522 ctx->tfm = tfm;
523
524 return 0;
525}
526
527static void virtio_crypto_ablkcipher_exit(struct crypto_tfm *tfm)
528{
529 struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
530
531 if (!ctx->vcrypto)
532 return;
533
534 virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
535 virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
536 virtcrypto_dev_put(ctx->vcrypto);
537 ctx->vcrypto = NULL;
538}
539
540int virtio_crypto_ablkcipher_crypt_req(
541 struct crypto_engine *engine,
542 struct ablkcipher_request *req)
543{
544 struct virtio_crypto_sym_request *vc_sym_req =
545 ablkcipher_request_ctx(req);
546 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
547 struct data_queue *data_vq = vc_req->dataq;
548 int ret;
549
550 ret = __virtio_crypto_ablkcipher_do_req(vc_sym_req, req, data_vq);
551 if (ret < 0)
552 return ret;
553
554 virtqueue_kick(data_vq->vq);
555
556 return 0;
557}
558
559static void virtio_crypto_ablkcipher_finalize_req(
560 struct virtio_crypto_sym_request *vc_sym_req,
561 struct ablkcipher_request *req,
562 int err)
563{
564 crypto_finalize_cipher_request(vc_sym_req->base.dataq->engine,
565 req, err);
566 kzfree(vc_sym_req->iv);
567 virtcrypto_clear_request(&vc_sym_req->base);
568}
569
570static struct crypto_alg virtio_crypto_algs[] = { {
571 .cra_name = "cbc(aes)",
572 .cra_driver_name = "virtio_crypto_aes_cbc",
573 .cra_priority = 150,
574 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
575 .cra_blocksize = AES_BLOCK_SIZE,
576 .cra_ctxsize = sizeof(struct virtio_crypto_ablkcipher_ctx),
577 .cra_alignmask = 0,
578 .cra_module = THIS_MODULE,
579 .cra_type = &crypto_ablkcipher_type,
580 .cra_init = virtio_crypto_ablkcipher_init,
581 .cra_exit = virtio_crypto_ablkcipher_exit,
582 .cra_u = {
583 .ablkcipher = {
584 .setkey = virtio_crypto_ablkcipher_setkey,
585 .decrypt = virtio_crypto_ablkcipher_decrypt,
586 .encrypt = virtio_crypto_ablkcipher_encrypt,
587 .min_keysize = AES_MIN_KEY_SIZE,
588 .max_keysize = AES_MAX_KEY_SIZE,
589 .ivsize = AES_BLOCK_SIZE,
590 },
591 },
592} };
593
594int virtio_crypto_algs_register(void)
595{
596 int ret = 0;
597
598 mutex_lock(&algs_lock);
599 if (++virtio_crypto_active_devs != 1)
600 goto unlock;
601
602 ret = crypto_register_algs(virtio_crypto_algs,
603 ARRAY_SIZE(virtio_crypto_algs));
604 if (ret)
605 virtio_crypto_active_devs--;
606
607unlock:
608 mutex_unlock(&algs_lock);
609 return ret;
610}
611
612void virtio_crypto_algs_unregister(void)
613{
614 mutex_lock(&algs_lock);
615 if (--virtio_crypto_active_devs != 0)
616 goto unlock;
617
618 crypto_unregister_algs(virtio_crypto_algs,
619 ARRAY_SIZE(virtio_crypto_algs));
620
621unlock:
622 mutex_unlock(&algs_lock);
623}
624
