1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 /*
4  * Copyright (C) 2016 Cavium, Inc.
5  */
6 
7 #include <crypto/aes.h>
8 #include <crypto/algapi.h>
9 #include <crypto/authenc.h>
10 #include <crypto/internal/des.h>
11 #include <crypto/xts.h>
12 #include <linux/crypto.h>
13 #include <linux/err.h>
14 #include <linux/list.h>
15 #include <linux/scatterlist.h>
16 
17 #include "cptvf.h"
18 #include "cptvf_algs.h"
19 
20 struct cpt_device_handle {
21 	void *cdev[MAX_DEVICES];
22 	u32 dev_count;
23 };
24 
25 static struct cpt_device_handle dev_handle;
26 
27 static void cvm_callback(u32 status, void *arg)
28 {
29 	struct crypto_async_request *req = (struct crypto_async_request *)arg;
30 
31 	req->complete(req, !status);
32 }
33 
34 static inline void update_input_iv(struct cpt_request_info *req_info,
35 				   u8 *iv, u32 enc_iv_len,
36 				   u32 *argcnt)
37 {
38 	/* Setting the iv information */
39 	req_info->in[*argcnt].vptr = (void *)iv;
40 	req_info->in[*argcnt].size = enc_iv_len;
41 	req_info->req.dlen += enc_iv_len;
42 
43 	++(*argcnt);
44 }
45 
46 static inline void update_output_iv(struct cpt_request_info *req_info,
47 				    u8 *iv, u32 enc_iv_len,
48 				    u32 *argcnt)
49 {
50 	/* Setting the iv information */
51 	req_info->out[*argcnt].vptr = (void *)iv;
52 	req_info->out[*argcnt].size = enc_iv_len;
53 	req_info->rlen += enc_iv_len;
54 
55 	++(*argcnt);
56 }
57 
58 static inline void update_input_data(struct cpt_request_info *req_info,
59 				     struct scatterlist *inp_sg,
60 				     u32 nbytes, u32 *argcnt)
61 {
62 	req_info->req.dlen += nbytes;
63 
64 	while (nbytes) {
65 		u32 len = min(nbytes, inp_sg->length);
66 		u8 *ptr = sg_virt(inp_sg);
67 
68 		req_info->in[*argcnt].vptr = (void *)ptr;
69 		req_info->in[*argcnt].size = len;
70 		nbytes -= len;
71 
72 		++(*argcnt);
73 		++inp_sg;
74 	}
75 }
76 
77 static inline void update_output_data(struct cpt_request_info *req_info,
78 				      struct scatterlist *outp_sg,
79 				      u32 nbytes, u32 *argcnt)
80 {
81 	req_info->rlen += nbytes;
82 
83 	while (nbytes) {
84 		u32 len = min(nbytes, outp_sg->length);
85 		u8 *ptr = sg_virt(outp_sg);
86 
87 		req_info->out[*argcnt].vptr = (void *)ptr;
88 		req_info->out[*argcnt].size = len;
89 		nbytes -= len;
90 		++(*argcnt);
91 		++outp_sg;
92 	}
93 }
94 
95 static inline u32 create_ctx_hdr(struct ablkcipher_request *req, u32 enc,
96 				 u32 *argcnt)
97 {
98 	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
99 	struct cvm_enc_ctx *ctx = crypto_ablkcipher_ctx(tfm);
100 	struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
101 	struct fc_context *fctx = &rctx->fctx;
102 	u64 *offset_control = &rctx->control_word;
103 	u32 enc_iv_len = crypto_ablkcipher_ivsize(tfm);
104 	struct cpt_request_info *req_info = &rctx->cpt_req;
105 	u64 *ctrl_flags = NULL;
106 
107 	req_info->ctrl.s.grp = 0;
108 	req_info->ctrl.s.dma_mode = DMA_GATHER_SCATTER;
109 	req_info->ctrl.s.se_req = SE_CORE_REQ;
110 
111 	req_info->req.opcode.s.major = MAJOR_OP_FC |
112 					DMA_MODE_FLAG(DMA_GATHER_SCATTER);
113 	if (enc)
114 		req_info->req.opcode.s.minor = 2;
115 	else
116 		req_info->req.opcode.s.minor = 3;
117 
118 	req_info->req.param1 = req->nbytes; /* Encryption Data length */
119 	req_info->req.param2 = 0; /*Auth data length */
120 
121 	fctx->enc.enc_ctrl.e.enc_cipher = ctx->cipher_type;
122 	fctx->enc.enc_ctrl.e.aes_key = ctx->key_type;
123 	fctx->enc.enc_ctrl.e.iv_source = FROM_DPTR;
124 
125 	if (ctx->cipher_type == AES_XTS)
126 		memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len * 2);
127 	else
128 		memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len);
129 	ctrl_flags = (u64 *)&fctx->enc.enc_ctrl.flags;
130 	*ctrl_flags = cpu_to_be64(*ctrl_flags);
131 
132 	*offset_control = cpu_to_be64(((u64)(enc_iv_len) << 16));
133 	/* Storing  Packet Data Information in offset
134 	 * Control Word First 8 bytes
135 	 */
136 	req_info->in[*argcnt].vptr = (u8 *)offset_control;
137 	req_info->in[*argcnt].size = CONTROL_WORD_LEN;
138 	req_info->req.dlen += CONTROL_WORD_LEN;
139 	++(*argcnt);
140 
141 	req_info->in[*argcnt].vptr = (u8 *)fctx;
142 	req_info->in[*argcnt].size = sizeof(struct fc_context);
143 	req_info->req.dlen += sizeof(struct fc_context);
144 
145 	++(*argcnt);
146 
147 	return 0;
148 }
149 
150 static inline u32 create_input_list(struct ablkcipher_request  *req, u32 enc,
151 				    u32 enc_iv_len)
152 {
153 	struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
154 	struct cpt_request_info *req_info = &rctx->cpt_req;
155 	u32 argcnt =  0;
156 
157 	create_ctx_hdr(req, enc, &argcnt);
158 	update_input_iv(req_info, req->info, enc_iv_len, &argcnt);
159 	update_input_data(req_info, req->src, req->nbytes, &argcnt);
160 	req_info->incnt = argcnt;
161 
162 	return 0;
163 }
164 
165 static inline void store_cb_info(struct ablkcipher_request *req,
166 				 struct cpt_request_info *req_info)
167 {
168 	req_info->callback = (void *)cvm_callback;
169 	req_info->callback_arg = (void *)&req->base;
170 }
171 
172 static inline void create_output_list(struct ablkcipher_request *req,
173 				      u32 enc_iv_len)
174 {
175 	struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
176 	struct cpt_request_info *req_info = &rctx->cpt_req;
177 	u32 argcnt = 0;
178 
179 	/* OUTPUT Buffer Processing
180 	 * AES encryption/decryption output would be
181 	 * received in the following format
182 	 *
183 	 * ------IV--------|------ENCRYPTED/DECRYPTED DATA-----|
184 	 * [ 16 Bytes/     [   Request Enc/Dec/ DATA Len AES CBC ]
185 	 */
186 	/* Reading IV information */
187 	update_output_iv(req_info, req->info, enc_iv_len, &argcnt);
188 	update_output_data(req_info, req->dst, req->nbytes, &argcnt);
189 	req_info->outcnt = argcnt;
190 }
191 
192 static inline int cvm_enc_dec(struct ablkcipher_request *req, u32 enc)
193 {
194 	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
195 	struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
196 	u32 enc_iv_len = crypto_ablkcipher_ivsize(tfm);
197 	struct fc_context *fctx = &rctx->fctx;
198 	struct cpt_request_info *req_info = &rctx->cpt_req;
199 	void *cdev = NULL;
200 	int status;
201 
202 	memset(req_info, 0, sizeof(struct cpt_request_info));
203 	memset(fctx, 0, sizeof(struct fc_context));
204 	create_input_list(req, enc, enc_iv_len);
205 	create_output_list(req, enc_iv_len);
206 	store_cb_info(req, req_info);
207 	cdev = dev_handle.cdev[smp_processor_id()];
208 	status = cptvf_do_request(cdev, req_info);
209 	/* We perform an asynchronous send and once
210 	 * the request is completed the driver would
211 	 * intimate through  registered call back functions
212 	 */
213 
214 	if (status)
215 		return status;
216 	else
217 		return -EINPROGRESS;
218 }
219 
220 static int cvm_encrypt(struct ablkcipher_request *req)
221 {
222 	return cvm_enc_dec(req, true);
223 }
224 
225 static int cvm_decrypt(struct ablkcipher_request *req)
226 {
227 	return cvm_enc_dec(req, false);
228 }
229 
230 static int cvm_xts_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
231 		   u32 keylen)
232 {
233 	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
234 	struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
235 	int err;
236 	const u8 *key1 = key;
237 	const u8 *key2 = key + (keylen / 2);
238 
239 	err = xts_check_key(tfm, key, keylen);
240 	if (err)
241 		return err;
242 	ctx->key_len = keylen;
243 	memcpy(ctx->enc_key, key1, keylen / 2);
244 	memcpy(ctx->enc_key + KEY2_OFFSET, key2, keylen / 2);
245 	ctx->cipher_type = AES_XTS;
246 	switch (ctx->key_len) {
247 	case 32:
248 		ctx->key_type = AES_128_BIT;
249 		break;
250 	case 64:
251 		ctx->key_type = AES_256_BIT;
252 		break;
253 	default:
254 		return -EINVAL;
255 	}
256 
257 	return 0;
258 }
259 
260 static int cvm_validate_keylen(struct cvm_enc_ctx *ctx, u32 keylen)
261 {
262 	if ((keylen == 16) || (keylen == 24) || (keylen == 32)) {
263 		ctx->key_len = keylen;
264 		switch (ctx->key_len) {
265 		case 16:
266 			ctx->key_type = AES_128_BIT;
267 			break;
268 		case 24:
269 			ctx->key_type = AES_192_BIT;
270 			break;
271 		case 32:
272 			ctx->key_type = AES_256_BIT;
273 			break;
274 		default:
275 			return -EINVAL;
276 		}
277 
278 		if (ctx->cipher_type == DES3_CBC)
279 			ctx->key_type = 0;
280 
281 		return 0;
282 	}
283 
284 	return -EINVAL;
285 }
286 
287 static int cvm_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
288 		      u32 keylen, u8 cipher_type)
289 {
290 	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
291 	struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
292 
293 	ctx->cipher_type = cipher_type;
294 	if (!cvm_validate_keylen(ctx, keylen)) {
295 		memcpy(ctx->enc_key, key, keylen);
296 		return 0;
297 	} else {
298 		crypto_ablkcipher_set_flags(cipher,
299 					    CRYPTO_TFM_RES_BAD_KEY_LEN);
300 		return -EINVAL;
301 	}
302 }
303 
304 static int cvm_cbc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
305 			      u32 keylen)
306 {
307 	return cvm_setkey(cipher, key, keylen, AES_CBC);
308 }
309 
310 static int cvm_ecb_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
311 			      u32 keylen)
312 {
313 	return cvm_setkey(cipher, key, keylen, AES_ECB);
314 }
315 
316 static int cvm_cfb_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
317 			      u32 keylen)
318 {
319 	return cvm_setkey(cipher, key, keylen, AES_CFB);
320 }
321 
322 static int cvm_cbc_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
323 			       u32 keylen)
324 {
325 	return verify_ablkcipher_des3_key(cipher, key) ?:
326 	       cvm_setkey(cipher, key, keylen, DES3_CBC);
327 }
328 
329 static int cvm_ecb_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
330 			       u32 keylen)
331 {
332 	return verify_ablkcipher_des3_key(cipher, key) ?:
333 	       cvm_setkey(cipher, key, keylen, DES3_ECB);
334 }
335 
336 static int cvm_enc_dec_init(struct crypto_tfm *tfm)
337 {
338 	tfm->crt_ablkcipher.reqsize = sizeof(struct cvm_req_ctx);
339 	return 0;
340 }
341 
342 static struct crypto_alg algs[] = { {
343 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
344 	.cra_blocksize = AES_BLOCK_SIZE,
345 	.cra_ctxsize = sizeof(struct cvm_enc_ctx),
346 	.cra_alignmask = 7,
347 	.cra_priority = 4001,
348 	.cra_name = "xts(aes)",
349 	.cra_driver_name = "cavium-xts-aes",
350 	.cra_type = &crypto_ablkcipher_type,
351 	.cra_u = {
352 		.ablkcipher = {
353 			.ivsize = AES_BLOCK_SIZE,
354 			.min_keysize = 2 * AES_MIN_KEY_SIZE,
355 			.max_keysize = 2 * AES_MAX_KEY_SIZE,
356 			.setkey = cvm_xts_setkey,
357 			.encrypt = cvm_encrypt,
358 			.decrypt = cvm_decrypt,
359 		},
360 	},
361 	.cra_init = cvm_enc_dec_init,
362 	.cra_module = THIS_MODULE,
363 }, {
364 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
365 	.cra_blocksize = AES_BLOCK_SIZE,
366 	.cra_ctxsize = sizeof(struct cvm_enc_ctx),
367 	.cra_alignmask = 7,
368 	.cra_priority = 4001,
369 	.cra_name = "cbc(aes)",
370 	.cra_driver_name = "cavium-cbc-aes",
371 	.cra_type = &crypto_ablkcipher_type,
372 	.cra_u = {
373 		.ablkcipher = {
374 			.ivsize = AES_BLOCK_SIZE,
375 			.min_keysize = AES_MIN_KEY_SIZE,
376 			.max_keysize = AES_MAX_KEY_SIZE,
377 			.setkey = cvm_cbc_aes_setkey,
378 			.encrypt = cvm_encrypt,
379 			.decrypt = cvm_decrypt,
380 		},
381 	},
382 	.cra_init = cvm_enc_dec_init,
383 	.cra_module = THIS_MODULE,
384 }, {
385 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
386 	.cra_blocksize = AES_BLOCK_SIZE,
387 	.cra_ctxsize = sizeof(struct cvm_enc_ctx),
388 	.cra_alignmask = 7,
389 	.cra_priority = 4001,
390 	.cra_name = "ecb(aes)",
391 	.cra_driver_name = "cavium-ecb-aes",
392 	.cra_type = &crypto_ablkcipher_type,
393 	.cra_u = {
394 		.ablkcipher = {
395 			.ivsize = AES_BLOCK_SIZE,
396 			.min_keysize = AES_MIN_KEY_SIZE,
397 			.max_keysize = AES_MAX_KEY_SIZE,
398 			.setkey = cvm_ecb_aes_setkey,
399 			.encrypt = cvm_encrypt,
400 			.decrypt = cvm_decrypt,
401 		},
402 	},
403 	.cra_init = cvm_enc_dec_init,
404 	.cra_module = THIS_MODULE,
405 }, {
406 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
407 	.cra_blocksize = AES_BLOCK_SIZE,
408 	.cra_ctxsize = sizeof(struct cvm_enc_ctx),
409 	.cra_alignmask = 7,
410 	.cra_priority = 4001,
411 	.cra_name = "cfb(aes)",
412 	.cra_driver_name = "cavium-cfb-aes",
413 	.cra_type = &crypto_ablkcipher_type,
414 	.cra_u = {
415 		.ablkcipher = {
416 			.ivsize = AES_BLOCK_SIZE,
417 			.min_keysize = AES_MIN_KEY_SIZE,
418 			.max_keysize = AES_MAX_KEY_SIZE,
419 			.setkey = cvm_cfb_aes_setkey,
420 			.encrypt = cvm_encrypt,
421 			.decrypt = cvm_decrypt,
422 		},
423 	},
424 	.cra_init = cvm_enc_dec_init,
425 	.cra_module = THIS_MODULE,
426 }, {
427 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
428 	.cra_blocksize = DES3_EDE_BLOCK_SIZE,
429 	.cra_ctxsize = sizeof(struct cvm_des3_ctx),
430 	.cra_alignmask = 7,
431 	.cra_priority = 4001,
432 	.cra_name = "cbc(des3_ede)",
433 	.cra_driver_name = "cavium-cbc-des3_ede",
434 	.cra_type = &crypto_ablkcipher_type,
435 	.cra_u = {
436 		.ablkcipher = {
437 			.min_keysize = DES3_EDE_KEY_SIZE,
438 			.max_keysize = DES3_EDE_KEY_SIZE,
439 			.ivsize = DES_BLOCK_SIZE,
440 			.setkey = cvm_cbc_des3_setkey,
441 			.encrypt = cvm_encrypt,
442 			.decrypt = cvm_decrypt,
443 		},
444 	},
445 	.cra_init = cvm_enc_dec_init,
446 	.cra_module = THIS_MODULE,
447 }, {
448 	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
449 	.cra_blocksize = DES3_EDE_BLOCK_SIZE,
450 	.cra_ctxsize = sizeof(struct cvm_des3_ctx),
451 	.cra_alignmask = 7,
452 	.cra_priority = 4001,
453 	.cra_name = "ecb(des3_ede)",
454 	.cra_driver_name = "cavium-ecb-des3_ede",
455 	.cra_type = &crypto_ablkcipher_type,
456 	.cra_u = {
457 		.ablkcipher = {
458 			.min_keysize = DES3_EDE_KEY_SIZE,
459 			.max_keysize = DES3_EDE_KEY_SIZE,
460 			.ivsize = DES_BLOCK_SIZE,
461 			.setkey = cvm_ecb_des3_setkey,
462 			.encrypt = cvm_encrypt,
463 			.decrypt = cvm_decrypt,
464 		},
465 	},
466 	.cra_init = cvm_enc_dec_init,
467 	.cra_module = THIS_MODULE,
468 } };
469 
470 static inline int cav_register_algs(void)
471 {
472 	int err = 0;
473 
474 	err = crypto_register_algs(algs, ARRAY_SIZE(algs));
475 	if (err)
476 		return err;
477 
478 	return 0;
479 }
480 
481 static inline void cav_unregister_algs(void)
482 {
483 	crypto_unregister_algs(algs, ARRAY_SIZE(algs));
484 }
485 
486 int cvm_crypto_init(struct cpt_vf *cptvf)
487 {
488 	struct pci_dev *pdev = cptvf->pdev;
489 	u32 dev_count;
490 
491 	dev_count = dev_handle.dev_count;
492 	dev_handle.cdev[dev_count] = cptvf;
493 	dev_handle.dev_count++;
494 
495 	if (dev_count == 3) {
496 		if (cav_register_algs()) {
497 			dev_err(&pdev->dev, "Error in registering crypto algorithms\n");
498 			return -EINVAL;
499 		}
500 	}
501 
502 	return 0;
503 }
504 
505 void cvm_crypto_exit(void)
506 {
507 	u32 dev_count;
508 
509 	dev_count = --dev_handle.dev_count;
510 	if (!dev_count)
511 		cav_unregister_algs();
512 }
513