1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/printk.h>
4 #include <linux/crypto.h>
5 #include <linux/rtnetlink.h>
6
7 #include <crypto/aead.h>
8 #include <crypto/authenc.h>
9 #include <crypto/des.h>
10 #include <crypto/internal/aead.h>
11 #include <crypto/scatterwalk.h>
12 #include <crypto/gcm.h>
13
14 #include "nitrox_dev.h"
15 #include "nitrox_common.h"
16 #include "nitrox_req.h"
17
18 #define GCM_AES_SALT_SIZE 4
19
20 union gph_p3 {
21 struct {
22 #ifdef __BIG_ENDIAN_BITFIELD
23 u16 iv_offset : 8;
24 u16 auth_offset : 8;
25 #else
26 u16 auth_offset : 8;
27 u16 iv_offset : 8;
28 #endif
29 };
30 u16 param;
31 };
32
nitrox_aes_gcm_setkey(struct crypto_aead * aead,const u8 * key,unsigned int keylen)33 static int nitrox_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
34 unsigned int keylen)
35 {
36 int aes_keylen;
37 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
38 struct flexi_crypto_context *fctx;
39 union fc_ctx_flags flags;
40
41 aes_keylen = flexi_aes_keylen(keylen);
42 if (aes_keylen < 0)
43 return -EINVAL;
44
45 /* fill crypto context */
46 fctx = nctx->u.fctx;
47 flags.fu = be64_to_cpu(fctx->flags.f);
48 flags.w0.aes_keylen = aes_keylen;
49 fctx->flags.f = cpu_to_be64(flags.fu);
50
51 /* copy enc key to context */
52 memset(&fctx->crypto, 0, sizeof(fctx->crypto));
53 memcpy(fctx->crypto.u.key, key, keylen);
54
55 return 0;
56 }
57
nitrox_aead_setauthsize(struct crypto_aead * aead,unsigned int authsize)58 static int nitrox_aead_setauthsize(struct crypto_aead *aead,
59 unsigned int authsize)
60 {
61 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
62 struct flexi_crypto_context *fctx = nctx->u.fctx;
63 union fc_ctx_flags flags;
64
65 flags.fu = be64_to_cpu(fctx->flags.f);
66 flags.w0.mac_len = authsize;
67 fctx->flags.f = cpu_to_be64(flags.fu);
68
69 aead->authsize = authsize;
70
71 return 0;
72 }
73
nitrox_aes_gcm_setauthsize(struct crypto_aead * aead,unsigned int authsize)74 static int nitrox_aes_gcm_setauthsize(struct crypto_aead *aead,
75 unsigned int authsize)
76 {
77 switch (authsize) {
78 case 4:
79 case 8:
80 case 12:
81 case 13:
82 case 14:
83 case 15:
84 case 16:
85 break;
86 default:
87 return -EINVAL;
88 }
89
90 return nitrox_aead_setauthsize(aead, authsize);
91 }
92
alloc_src_sglist(struct nitrox_kcrypt_request * nkreq,struct scatterlist * src,char * iv,int ivsize,int buflen)93 static int alloc_src_sglist(struct nitrox_kcrypt_request *nkreq,
94 struct scatterlist *src, char *iv, int ivsize,
95 int buflen)
96 {
97 int nents = sg_nents_for_len(src, buflen);
98 int ret;
99
100 if (nents < 0)
101 return nents;
102
103 /* IV entry */
104 nents += 1;
105 /* Allocate buffer to hold IV and input scatterlist array */
106 ret = alloc_src_req_buf(nkreq, nents, ivsize);
107 if (ret)
108 return ret;
109
110 nitrox_creq_copy_iv(nkreq->src, iv, ivsize);
111 nitrox_creq_set_src_sg(nkreq, nents, ivsize, src, buflen);
112
113 return 0;
114 }
115
alloc_dst_sglist(struct nitrox_kcrypt_request * nkreq,struct scatterlist * dst,int ivsize,int buflen)116 static int alloc_dst_sglist(struct nitrox_kcrypt_request *nkreq,
117 struct scatterlist *dst, int ivsize, int buflen)
118 {
119 int nents = sg_nents_for_len(dst, buflen);
120 int ret;
121
122 if (nents < 0)
123 return nents;
124
125 /* IV, ORH, COMPLETION entries */
126 nents += 3;
127 /* Allocate buffer to hold ORH, COMPLETION and output scatterlist
128 * array
129 */
130 ret = alloc_dst_req_buf(nkreq, nents);
131 if (ret)
132 return ret;
133
134 nitrox_creq_set_orh(nkreq);
135 nitrox_creq_set_comp(nkreq);
136 nitrox_creq_set_dst_sg(nkreq, nents, ivsize, dst, buflen);
137
138 return 0;
139 }
140
free_src_sglist(struct nitrox_kcrypt_request * nkreq)141 static void free_src_sglist(struct nitrox_kcrypt_request *nkreq)
142 {
143 kfree(nkreq->src);
144 }
145
free_dst_sglist(struct nitrox_kcrypt_request * nkreq)146 static void free_dst_sglist(struct nitrox_kcrypt_request *nkreq)
147 {
148 kfree(nkreq->dst);
149 }
150
nitrox_set_creq(struct nitrox_aead_rctx * rctx)151 static int nitrox_set_creq(struct nitrox_aead_rctx *rctx)
152 {
153 struct se_crypto_request *creq = &rctx->nkreq.creq;
154 union gph_p3 param3;
155 int ret;
156
157 creq->flags = rctx->flags;
158 creq->gfp = (rctx->flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL :
159 GFP_ATOMIC;
160
161 creq->ctrl.value = 0;
162 creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
163 creq->ctrl.s.arg = rctx->ctrl_arg;
164
165 creq->gph.param0 = cpu_to_be16(rctx->cryptlen);
166 creq->gph.param1 = cpu_to_be16(rctx->cryptlen + rctx->assoclen);
167 creq->gph.param2 = cpu_to_be16(rctx->ivsize + rctx->assoclen);
168 param3.iv_offset = 0;
169 param3.auth_offset = rctx->ivsize;
170 creq->gph.param3 = cpu_to_be16(param3.param);
171
172 creq->ctx_handle = rctx->ctx_handle;
173 creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
174
175 ret = alloc_src_sglist(&rctx->nkreq, rctx->src, rctx->iv, rctx->ivsize,
176 rctx->srclen);
177 if (ret)
178 return ret;
179
180 ret = alloc_dst_sglist(&rctx->nkreq, rctx->dst, rctx->ivsize,
181 rctx->dstlen);
182 if (ret) {
183 free_src_sglist(&rctx->nkreq);
184 return ret;
185 }
186
187 return 0;
188 }
189
nitrox_aead_callback(void * arg,int err)190 static void nitrox_aead_callback(void *arg, int err)
191 {
192 struct aead_request *areq = arg;
193 struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
194
195 free_src_sglist(&rctx->nkreq);
196 free_dst_sglist(&rctx->nkreq);
197 if (err) {
198 pr_err_ratelimited("request failed status 0x%0x\n", err);
199 err = -EINVAL;
200 }
201
202 aead_request_complete(areq, err);
203 }
204
nitrox_aes_gcm_assoclen_supported(unsigned int assoclen)205 static inline bool nitrox_aes_gcm_assoclen_supported(unsigned int assoclen)
206 {
207 if (assoclen <= 512)
208 return true;
209
210 return false;
211 }
212
nitrox_aes_gcm_enc(struct aead_request * areq)213 static int nitrox_aes_gcm_enc(struct aead_request *areq)
214 {
215 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
216 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
217 struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
218 struct se_crypto_request *creq = &rctx->nkreq.creq;
219 struct flexi_crypto_context *fctx = nctx->u.fctx;
220 int ret;
221
222 if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
223 return -EINVAL;
224
225 memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
226
227 rctx->cryptlen = areq->cryptlen;
228 rctx->assoclen = areq->assoclen;
229 rctx->srclen = areq->assoclen + areq->cryptlen;
230 rctx->dstlen = rctx->srclen + aead->authsize;
231 rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
232 rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
233 rctx->flags = areq->base.flags;
234 rctx->ctx_handle = nctx->u.ctx_handle;
235 rctx->src = areq->src;
236 rctx->dst = areq->dst;
237 rctx->ctrl_arg = ENCRYPT;
238 ret = nitrox_set_creq(rctx);
239 if (ret)
240 return ret;
241
242 /* send the crypto request */
243 return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
244 areq);
245 }
246
nitrox_aes_gcm_dec(struct aead_request * areq)247 static int nitrox_aes_gcm_dec(struct aead_request *areq)
248 {
249 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
250 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
251 struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
252 struct se_crypto_request *creq = &rctx->nkreq.creq;
253 struct flexi_crypto_context *fctx = nctx->u.fctx;
254 int ret;
255
256 if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
257 return -EINVAL;
258
259 memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
260
261 rctx->cryptlen = areq->cryptlen - aead->authsize;
262 rctx->assoclen = areq->assoclen;
263 rctx->srclen = areq->cryptlen + areq->assoclen;
264 rctx->dstlen = rctx->srclen - aead->authsize;
265 rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
266 rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
267 rctx->flags = areq->base.flags;
268 rctx->ctx_handle = nctx->u.ctx_handle;
269 rctx->src = areq->src;
270 rctx->dst = areq->dst;
271 rctx->ctrl_arg = DECRYPT;
272 ret = nitrox_set_creq(rctx);
273 if (ret)
274 return ret;
275
276 /* send the crypto request */
277 return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
278 areq);
279 }
280
nitrox_aead_init(struct crypto_aead * aead)281 static int nitrox_aead_init(struct crypto_aead *aead)
282 {
283 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
284 struct crypto_ctx_hdr *chdr;
285
286 /* get the first device */
287 nctx->ndev = nitrox_get_first_device();
288 if (!nctx->ndev)
289 return -ENODEV;
290
291 /* allocate nitrox crypto context */
292 chdr = crypto_alloc_context(nctx->ndev);
293 if (!chdr) {
294 nitrox_put_device(nctx->ndev);
295 return -ENOMEM;
296 }
297 nctx->chdr = chdr;
298 nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
299 sizeof(struct ctx_hdr));
300 nctx->u.fctx->flags.f = 0;
301
302 return 0;
303 }
304
nitrox_gcm_common_init(struct crypto_aead * aead)305 static int nitrox_gcm_common_init(struct crypto_aead *aead)
306 {
307 int ret;
308 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
309 union fc_ctx_flags *flags;
310
311 ret = nitrox_aead_init(aead);
312 if (ret)
313 return ret;
314
315 flags = &nctx->u.fctx->flags;
316 flags->w0.cipher_type = CIPHER_AES_GCM;
317 flags->w0.hash_type = AUTH_NULL;
318 flags->w0.iv_source = IV_FROM_DPTR;
319 /* ask microcode to calculate ipad/opad */
320 flags->w0.auth_input_type = 1;
321 flags->f = cpu_to_be64(flags->fu);
322
323 return 0;
324 }
325
nitrox_aes_gcm_init(struct crypto_aead * aead)326 static int nitrox_aes_gcm_init(struct crypto_aead *aead)
327 {
328 int ret;
329
330 ret = nitrox_gcm_common_init(aead);
331 if (ret)
332 return ret;
333
334 crypto_aead_set_reqsize(aead,
335 sizeof(struct aead_request) +
336 sizeof(struct nitrox_aead_rctx));
337
338 return 0;
339 }
340
nitrox_aead_exit(struct crypto_aead * aead)341 static void nitrox_aead_exit(struct crypto_aead *aead)
342 {
343 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
344
345 /* free the nitrox crypto context */
346 if (nctx->u.ctx_handle) {
347 struct flexi_crypto_context *fctx = nctx->u.fctx;
348
349 memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
350 memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
351 crypto_free_context((void *)nctx->chdr);
352 }
353 nitrox_put_device(nctx->ndev);
354
355 nctx->u.ctx_handle = 0;
356 nctx->ndev = NULL;
357 }
358
nitrox_rfc4106_setkey(struct crypto_aead * aead,const u8 * key,unsigned int keylen)359 static int nitrox_rfc4106_setkey(struct crypto_aead *aead, const u8 *key,
360 unsigned int keylen)
361 {
362 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
363 struct flexi_crypto_context *fctx = nctx->u.fctx;
364 int ret;
365
366 if (keylen < GCM_AES_SALT_SIZE)
367 return -EINVAL;
368
369 keylen -= GCM_AES_SALT_SIZE;
370 ret = nitrox_aes_gcm_setkey(aead, key, keylen);
371 if (ret)
372 return ret;
373
374 memcpy(fctx->crypto.iv, key + keylen, GCM_AES_SALT_SIZE);
375 return 0;
376 }
377
nitrox_rfc4106_setauthsize(struct crypto_aead * aead,unsigned int authsize)378 static int nitrox_rfc4106_setauthsize(struct crypto_aead *aead,
379 unsigned int authsize)
380 {
381 switch (authsize) {
382 case 8:
383 case 12:
384 case 16:
385 break;
386 default:
387 return -EINVAL;
388 }
389
390 return nitrox_aead_setauthsize(aead, authsize);
391 }
392
nitrox_rfc4106_set_aead_rctx_sglist(struct aead_request * areq)393 static int nitrox_rfc4106_set_aead_rctx_sglist(struct aead_request *areq)
394 {
395 struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
396 struct nitrox_aead_rctx *aead_rctx = &rctx->base;
397 unsigned int assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
398 struct scatterlist *sg;
399
400 if (areq->assoclen != 16 && areq->assoclen != 20)
401 return -EINVAL;
402
403 scatterwalk_map_and_copy(rctx->assoc, areq->src, 0, assoclen, 0);
404 sg_init_table(rctx->src, 3);
405 sg_set_buf(rctx->src, rctx->assoc, assoclen);
406 sg = scatterwalk_ffwd(rctx->src + 1, areq->src, areq->assoclen);
407 if (sg != rctx->src + 1)
408 sg_chain(rctx->src, 2, sg);
409
410 if (areq->src != areq->dst) {
411 sg_init_table(rctx->dst, 3);
412 sg_set_buf(rctx->dst, rctx->assoc, assoclen);
413 sg = scatterwalk_ffwd(rctx->dst + 1, areq->dst, areq->assoclen);
414 if (sg != rctx->dst + 1)
415 sg_chain(rctx->dst, 2, sg);
416 }
417
418 aead_rctx->src = rctx->src;
419 aead_rctx->dst = (areq->src == areq->dst) ? rctx->src : rctx->dst;
420
421 return 0;
422 }
423
nitrox_rfc4106_callback(void * arg,int err)424 static void nitrox_rfc4106_callback(void *arg, int err)
425 {
426 struct aead_request *areq = arg;
427 struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
428 struct nitrox_kcrypt_request *nkreq = &rctx->base.nkreq;
429
430 free_src_sglist(nkreq);
431 free_dst_sglist(nkreq);
432 if (err) {
433 pr_err_ratelimited("request failed status 0x%0x\n", err);
434 err = -EINVAL;
435 }
436
437 aead_request_complete(areq, err);
438 }
439
nitrox_rfc4106_enc(struct aead_request * areq)440 static int nitrox_rfc4106_enc(struct aead_request *areq)
441 {
442 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
443 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
444 struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
445 struct nitrox_aead_rctx *aead_rctx = &rctx->base;
446 struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
447 int ret;
448
449 aead_rctx->cryptlen = areq->cryptlen;
450 aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
451 aead_rctx->srclen = aead_rctx->assoclen + aead_rctx->cryptlen;
452 aead_rctx->dstlen = aead_rctx->srclen + aead->authsize;
453 aead_rctx->iv = areq->iv;
454 aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
455 aead_rctx->flags = areq->base.flags;
456 aead_rctx->ctx_handle = nctx->u.ctx_handle;
457 aead_rctx->ctrl_arg = ENCRYPT;
458
459 ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
460 if (ret)
461 return ret;
462
463 ret = nitrox_set_creq(aead_rctx);
464 if (ret)
465 return ret;
466
467 /* send the crypto request */
468 return nitrox_process_se_request(nctx->ndev, creq,
469 nitrox_rfc4106_callback, areq);
470 }
471
nitrox_rfc4106_dec(struct aead_request * areq)472 static int nitrox_rfc4106_dec(struct aead_request *areq)
473 {
474 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
475 struct nitrox_crypto_ctx *nctx = crypto_aead_ctx_dma(aead);
476 struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
477 struct nitrox_aead_rctx *aead_rctx = &rctx->base;
478 struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
479 int ret;
480
481 aead_rctx->cryptlen = areq->cryptlen - aead->authsize;
482 aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
483 aead_rctx->srclen =
484 areq->cryptlen - GCM_RFC4106_IV_SIZE + areq->assoclen;
485 aead_rctx->dstlen = aead_rctx->srclen - aead->authsize;
486 aead_rctx->iv = areq->iv;
487 aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
488 aead_rctx->flags = areq->base.flags;
489 aead_rctx->ctx_handle = nctx->u.ctx_handle;
490 aead_rctx->ctrl_arg = DECRYPT;
491
492 ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
493 if (ret)
494 return ret;
495
496 ret = nitrox_set_creq(aead_rctx);
497 if (ret)
498 return ret;
499
500 /* send the crypto request */
501 return nitrox_process_se_request(nctx->ndev, creq,
502 nitrox_rfc4106_callback, areq);
503 }
504
nitrox_rfc4106_init(struct crypto_aead * aead)505 static int nitrox_rfc4106_init(struct crypto_aead *aead)
506 {
507 int ret;
508
509 ret = nitrox_gcm_common_init(aead);
510 if (ret)
511 return ret;
512
513 crypto_aead_set_reqsize_dma(aead, sizeof(struct aead_request) +
514 sizeof(struct nitrox_rfc4106_rctx));
515
516 return 0;
517 }
518
519 static struct aead_alg nitrox_aeads[] = { {
520 .base = {
521 .cra_name = "gcm(aes)",
522 .cra_driver_name = "n5_aes_gcm",
523 .cra_priority = PRIO,
524 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
525 .cra_blocksize = 1,
526 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
527 .cra_alignmask = 0,
528 .cra_module = THIS_MODULE,
529 },
530 .setkey = nitrox_aes_gcm_setkey,
531 .setauthsize = nitrox_aes_gcm_setauthsize,
532 .encrypt = nitrox_aes_gcm_enc,
533 .decrypt = nitrox_aes_gcm_dec,
534 .init = nitrox_aes_gcm_init,
535 .exit = nitrox_aead_exit,
536 .ivsize = GCM_AES_IV_SIZE,
537 .maxauthsize = AES_BLOCK_SIZE,
538 }, {
539 .base = {
540 .cra_name = "rfc4106(gcm(aes))",
541 .cra_driver_name = "n5_rfc4106",
542 .cra_priority = PRIO,
543 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
544 .cra_blocksize = 1,
545 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
546 .cra_alignmask = 0,
547 .cra_module = THIS_MODULE,
548 },
549 .setkey = nitrox_rfc4106_setkey,
550 .setauthsize = nitrox_rfc4106_setauthsize,
551 .encrypt = nitrox_rfc4106_enc,
552 .decrypt = nitrox_rfc4106_dec,
553 .init = nitrox_rfc4106_init,
554 .exit = nitrox_aead_exit,
555 .ivsize = GCM_RFC4106_IV_SIZE,
556 .maxauthsize = AES_BLOCK_SIZE,
557 } };
558
nitrox_register_aeads(void)559 int nitrox_register_aeads(void)
560 {
561 return crypto_register_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
562 }
563
nitrox_unregister_aeads(void)564 void nitrox_unregister_aeads(void)
565 {
566 crypto_unregister_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
567 }
568