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400c40cf SM |
1 | /* |
2 | * algif_aead: User-space interface for AEAD algorithms | |
3 | * | |
4 | * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de> | |
5 | * | |
6 | * This file provides the user-space API for AEAD ciphers. | |
7 | * | |
8 | * This file is derived from algif_skcipher.c. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | */ | |
15 | ||
16 | #include <crypto/scatterwalk.h> | |
17 | #include <crypto/if_alg.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/net.h> | |
24 | #include <net/sock.h> | |
25 | ||
26 | struct aead_sg_list { | |
27 | unsigned int cur; | |
28 | struct scatterlist sg[ALG_MAX_PAGES]; | |
29 | }; | |
30 | ||
31 | struct aead_ctx { | |
32 | struct aead_sg_list tsgl; | |
33 | /* | |
34 | * RSGL_MAX_ENTRIES is an artificial limit where user space at maximum | |
35 | * can cause the kernel to allocate RSGL_MAX_ENTRIES * ALG_MAX_PAGES | |
7b2a18e0 | 36 | * pages |
400c40cf SM |
37 | */ |
38 | #define RSGL_MAX_ENTRIES ALG_MAX_PAGES | |
39 | struct af_alg_sgl rsgl[RSGL_MAX_ENTRIES]; | |
40 | ||
41 | void *iv; | |
42 | ||
43 | struct af_alg_completion completion; | |
44 | ||
45 | unsigned long used; | |
46 | ||
47 | unsigned int len; | |
48 | bool more; | |
49 | bool merge; | |
50 | bool enc; | |
51 | ||
52 | size_t aead_assoclen; | |
53 | struct aead_request aead_req; | |
54 | }; | |
55 | ||
56 | static inline int aead_sndbuf(struct sock *sk) | |
57 | { | |
58 | struct alg_sock *ask = alg_sk(sk); | |
59 | struct aead_ctx *ctx = ask->private; | |
60 | ||
61 | return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) - | |
62 | ctx->used, 0); | |
63 | } | |
64 | ||
65 | static inline bool aead_writable(struct sock *sk) | |
66 | { | |
67 | return PAGE_SIZE <= aead_sndbuf(sk); | |
68 | } | |
69 | ||
70 | static inline bool aead_sufficient_data(struct aead_ctx *ctx) | |
71 | { | |
72 | unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req)); | |
73 | ||
74 | return (ctx->used >= (ctx->aead_assoclen + (ctx->enc ? 0 : as))); | |
75 | } | |
76 | ||
77 | static void aead_put_sgl(struct sock *sk) | |
78 | { | |
79 | struct alg_sock *ask = alg_sk(sk); | |
80 | struct aead_ctx *ctx = ask->private; | |
81 | struct aead_sg_list *sgl = &ctx->tsgl; | |
82 | struct scatterlist *sg = sgl->sg; | |
83 | unsigned int i; | |
84 | ||
85 | for (i = 0; i < sgl->cur; i++) { | |
86 | if (!sg_page(sg + i)) | |
87 | continue; | |
88 | ||
89 | put_page(sg_page(sg + i)); | |
90 | sg_assign_page(sg + i, NULL); | |
91 | } | |
92 | sgl->cur = 0; | |
93 | ctx->used = 0; | |
94 | ctx->more = 0; | |
95 | ctx->merge = 0; | |
96 | } | |
97 | ||
98 | static void aead_wmem_wakeup(struct sock *sk) | |
99 | { | |
100 | struct socket_wq *wq; | |
101 | ||
102 | if (!aead_writable(sk)) | |
103 | return; | |
104 | ||
105 | rcu_read_lock(); | |
106 | wq = rcu_dereference(sk->sk_wq); | |
107 | if (wq_has_sleeper(wq)) | |
108 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
109 | POLLRDNORM | | |
110 | POLLRDBAND); | |
111 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
112 | rcu_read_unlock(); | |
113 | } | |
114 | ||
115 | static int aead_wait_for_data(struct sock *sk, unsigned flags) | |
116 | { | |
117 | struct alg_sock *ask = alg_sk(sk); | |
118 | struct aead_ctx *ctx = ask->private; | |
119 | long timeout; | |
120 | DEFINE_WAIT(wait); | |
121 | int err = -ERESTARTSYS; | |
122 | ||
123 | if (flags & MSG_DONTWAIT) | |
124 | return -EAGAIN; | |
125 | ||
126 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
127 | ||
128 | for (;;) { | |
129 | if (signal_pending(current)) | |
130 | break; | |
131 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
132 | timeout = MAX_SCHEDULE_TIMEOUT; | |
133 | if (sk_wait_event(sk, &timeout, !ctx->more)) { | |
134 | err = 0; | |
135 | break; | |
136 | } | |
137 | } | |
138 | finish_wait(sk_sleep(sk), &wait); | |
139 | ||
140 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
141 | ||
142 | return err; | |
143 | } | |
144 | ||
145 | static void aead_data_wakeup(struct sock *sk) | |
146 | { | |
147 | struct alg_sock *ask = alg_sk(sk); | |
148 | struct aead_ctx *ctx = ask->private; | |
149 | struct socket_wq *wq; | |
150 | ||
151 | if (ctx->more) | |
152 | return; | |
153 | if (!ctx->used) | |
154 | return; | |
155 | ||
156 | rcu_read_lock(); | |
157 | wq = rcu_dereference(sk->sk_wq); | |
158 | if (wq_has_sleeper(wq)) | |
159 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
160 | POLLRDNORM | | |
161 | POLLRDBAND); | |
162 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); | |
163 | rcu_read_unlock(); | |
164 | } | |
165 | ||
eccd02f3 | 166 | static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
400c40cf SM |
167 | { |
168 | struct sock *sk = sock->sk; | |
169 | struct alg_sock *ask = alg_sk(sk); | |
170 | struct aead_ctx *ctx = ask->private; | |
171 | unsigned ivsize = | |
172 | crypto_aead_ivsize(crypto_aead_reqtfm(&ctx->aead_req)); | |
173 | struct aead_sg_list *sgl = &ctx->tsgl; | |
174 | struct af_alg_control con = {}; | |
175 | long copied = 0; | |
176 | bool enc = 0; | |
177 | bool init = 0; | |
178 | int err = -EINVAL; | |
179 | ||
180 | if (msg->msg_controllen) { | |
181 | err = af_alg_cmsg_send(msg, &con); | |
182 | if (err) | |
183 | return err; | |
184 | ||
185 | init = 1; | |
186 | switch (con.op) { | |
187 | case ALG_OP_ENCRYPT: | |
188 | enc = 1; | |
189 | break; | |
190 | case ALG_OP_DECRYPT: | |
191 | enc = 0; | |
192 | break; | |
193 | default: | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | if (con.iv && con.iv->ivlen != ivsize) | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | lock_sock(sk); | |
202 | if (!ctx->more && ctx->used) | |
203 | goto unlock; | |
204 | ||
205 | if (init) { | |
206 | ctx->enc = enc; | |
207 | if (con.iv) | |
208 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
209 | ||
210 | ctx->aead_assoclen = con.aead_assoclen; | |
211 | } | |
212 | ||
213 | while (size) { | |
214 | unsigned long len = size; | |
215 | struct scatterlist *sg = NULL; | |
216 | ||
217 | /* use the existing memory in an allocated page */ | |
218 | if (ctx->merge) { | |
219 | sg = sgl->sg + sgl->cur - 1; | |
220 | len = min_t(unsigned long, len, | |
221 | PAGE_SIZE - sg->offset - sg->length); | |
222 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
223 | sg->offset + sg->length, | |
224 | msg, len); | |
225 | if (err) | |
226 | goto unlock; | |
227 | ||
228 | sg->length += len; | |
229 | ctx->merge = (sg->offset + sg->length) & | |
230 | (PAGE_SIZE - 1); | |
231 | ||
232 | ctx->used += len; | |
233 | copied += len; | |
234 | size -= len; | |
235 | continue; | |
236 | } | |
237 | ||
238 | if (!aead_writable(sk)) { | |
239 | /* user space sent too much data */ | |
240 | aead_put_sgl(sk); | |
241 | err = -EMSGSIZE; | |
242 | goto unlock; | |
243 | } | |
244 | ||
245 | /* allocate a new page */ | |
246 | len = min_t(unsigned long, size, aead_sndbuf(sk)); | |
247 | while (len) { | |
248 | int plen = 0; | |
249 | ||
250 | if (sgl->cur >= ALG_MAX_PAGES) { | |
251 | aead_put_sgl(sk); | |
252 | err = -E2BIG; | |
253 | goto unlock; | |
254 | } | |
255 | ||
256 | sg = sgl->sg + sgl->cur; | |
257 | plen = min_t(int, len, PAGE_SIZE); | |
258 | ||
259 | sg_assign_page(sg, alloc_page(GFP_KERNEL)); | |
260 | err = -ENOMEM; | |
261 | if (!sg_page(sg)) | |
262 | goto unlock; | |
263 | ||
264 | err = memcpy_from_msg(page_address(sg_page(sg)), | |
265 | msg, plen); | |
266 | if (err) { | |
267 | __free_page(sg_page(sg)); | |
268 | sg_assign_page(sg, NULL); | |
269 | goto unlock; | |
270 | } | |
271 | ||
272 | sg->offset = 0; | |
273 | sg->length = plen; | |
274 | len -= plen; | |
275 | ctx->used += plen; | |
276 | copied += plen; | |
277 | sgl->cur++; | |
278 | size -= plen; | |
279 | ctx->merge = plen & (PAGE_SIZE - 1); | |
280 | } | |
281 | } | |
282 | ||
283 | err = 0; | |
284 | ||
285 | ctx->more = msg->msg_flags & MSG_MORE; | |
286 | if (!ctx->more && !aead_sufficient_data(ctx)) { | |
287 | aead_put_sgl(sk); | |
288 | err = -EMSGSIZE; | |
289 | } | |
290 | ||
291 | unlock: | |
292 | aead_data_wakeup(sk); | |
293 | release_sock(sk); | |
294 | ||
295 | return err ?: copied; | |
296 | } | |
297 | ||
298 | static ssize_t aead_sendpage(struct socket *sock, struct page *page, | |
299 | int offset, size_t size, int flags) | |
300 | { | |
301 | struct sock *sk = sock->sk; | |
302 | struct alg_sock *ask = alg_sk(sk); | |
303 | struct aead_ctx *ctx = ask->private; | |
304 | struct aead_sg_list *sgl = &ctx->tsgl; | |
305 | int err = -EINVAL; | |
306 | ||
307 | if (flags & MSG_SENDPAGE_NOTLAST) | |
308 | flags |= MSG_MORE; | |
309 | ||
310 | if (sgl->cur >= ALG_MAX_PAGES) | |
311 | return -E2BIG; | |
312 | ||
313 | lock_sock(sk); | |
314 | if (!ctx->more && ctx->used) | |
315 | goto unlock; | |
316 | ||
317 | if (!size) | |
318 | goto done; | |
319 | ||
320 | if (!aead_writable(sk)) { | |
321 | /* user space sent too much data */ | |
322 | aead_put_sgl(sk); | |
323 | err = -EMSGSIZE; | |
324 | goto unlock; | |
325 | } | |
326 | ||
327 | ctx->merge = 0; | |
328 | ||
329 | get_page(page); | |
330 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
331 | sgl->cur++; | |
332 | ctx->used += size; | |
333 | ||
334 | err = 0; | |
335 | ||
336 | done: | |
337 | ctx->more = flags & MSG_MORE; | |
338 | if (!ctx->more && !aead_sufficient_data(ctx)) { | |
339 | aead_put_sgl(sk); | |
340 | err = -EMSGSIZE; | |
341 | } | |
342 | ||
343 | unlock: | |
344 | aead_data_wakeup(sk); | |
345 | release_sock(sk); | |
346 | ||
347 | return err ?: size; | |
348 | } | |
349 | ||
eccd02f3 | 350 | static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
400c40cf SM |
351 | { |
352 | struct sock *sk = sock->sk; | |
353 | struct alg_sock *ask = alg_sk(sk); | |
354 | struct aead_ctx *ctx = ask->private; | |
355 | unsigned bs = crypto_aead_blocksize(crypto_aead_reqtfm(&ctx->aead_req)); | |
356 | unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req)); | |
357 | struct aead_sg_list *sgl = &ctx->tsgl; | |
358 | struct scatterlist *sg = NULL; | |
359 | struct scatterlist assoc[ALG_MAX_PAGES]; | |
360 | size_t assoclen = 0; | |
361 | unsigned int i = 0; | |
362 | int err = -EINVAL; | |
363 | unsigned long used = 0; | |
364 | size_t outlen = 0; | |
365 | size_t usedpages = 0; | |
366 | unsigned int cnt = 0; | |
367 | ||
368 | /* Limit number of IOV blocks to be accessed below */ | |
369 | if (msg->msg_iter.nr_segs > RSGL_MAX_ENTRIES) | |
370 | return -ENOMSG; | |
371 | ||
372 | lock_sock(sk); | |
373 | ||
374 | /* | |
375 | * AEAD memory structure: For encryption, the tag is appended to the | |
376 | * ciphertext which implies that the memory allocated for the ciphertext | |
377 | * must be increased by the tag length. For decryption, the tag | |
378 | * is expected to be concatenated to the ciphertext. The plaintext | |
379 | * therefore has a memory size of the ciphertext minus the tag length. | |
380 | * | |
381 | * The memory structure for cipher operation has the following | |
382 | * structure: | |
383 | * AEAD encryption input: assoc data || plaintext | |
384 | * AEAD encryption output: cipherntext || auth tag | |
385 | * AEAD decryption input: assoc data || ciphertext || auth tag | |
386 | * AEAD decryption output: plaintext | |
387 | */ | |
388 | ||
389 | if (ctx->more) { | |
390 | err = aead_wait_for_data(sk, flags); | |
391 | if (err) | |
392 | goto unlock; | |
393 | } | |
394 | ||
395 | used = ctx->used; | |
396 | ||
397 | /* | |
398 | * Make sure sufficient data is present -- note, the same check is | |
399 | * is also present in sendmsg/sendpage. The checks in sendpage/sendmsg | |
400 | * shall provide an information to the data sender that something is | |
401 | * wrong, but they are irrelevant to maintain the kernel integrity. | |
402 | * We need this check here too in case user space decides to not honor | |
403 | * the error message in sendmsg/sendpage and still call recvmsg. This | |
404 | * check here protects the kernel integrity. | |
405 | */ | |
406 | if (!aead_sufficient_data(ctx)) | |
407 | goto unlock; | |
408 | ||
409 | /* | |
410 | * The cipher operation input data is reduced by the associated data | |
411 | * length as this data is processed separately later on. | |
412 | */ | |
413 | used -= ctx->aead_assoclen; | |
414 | ||
415 | if (ctx->enc) { | |
416 | /* round up output buffer to multiple of block size */ | |
417 | outlen = ((used + bs - 1) / bs * bs); | |
418 | /* add the size needed for the auth tag to be created */ | |
419 | outlen += as; | |
420 | } else { | |
421 | /* output data size is input without the authentication tag */ | |
422 | outlen = used - as; | |
423 | /* round up output buffer to multiple of block size */ | |
424 | outlen = ((outlen + bs - 1) / bs * bs); | |
425 | } | |
426 | ||
427 | /* convert iovecs of output buffers into scatterlists */ | |
428 | while (iov_iter_count(&msg->msg_iter)) { | |
429 | size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter), | |
430 | (outlen - usedpages)); | |
431 | ||
432 | /* make one iovec available as scatterlist */ | |
433 | err = af_alg_make_sg(&ctx->rsgl[cnt], &msg->msg_iter, | |
434 | seglen); | |
435 | if (err < 0) | |
436 | goto unlock; | |
437 | usedpages += err; | |
7b2a18e0 | 438 | /* chain the new scatterlist with previous one */ |
400c40cf | 439 | if (cnt) |
7b2a18e0 TS |
440 | af_alg_link_sg(&ctx->rsgl[cnt-1], &ctx->rsgl[cnt]); |
441 | ||
400c40cf SM |
442 | /* we do not need more iovecs as we have sufficient memory */ |
443 | if (outlen <= usedpages) | |
444 | break; | |
445 | iov_iter_advance(&msg->msg_iter, err); | |
446 | cnt++; | |
447 | } | |
448 | ||
449 | err = -EINVAL; | |
450 | /* ensure output buffer is sufficiently large */ | |
451 | if (usedpages < outlen) | |
452 | goto unlock; | |
453 | ||
454 | sg_init_table(assoc, ALG_MAX_PAGES); | |
455 | assoclen = ctx->aead_assoclen; | |
456 | /* | |
457 | * Split scatterlist into two: first part becomes AD, second part | |
458 | * is plaintext / ciphertext. The first part is assigned to assoc | |
459 | * scatterlist. When this loop finishes, sg points to the start of the | |
460 | * plaintext / ciphertext. | |
461 | */ | |
462 | for (i = 0; i < ctx->tsgl.cur; i++) { | |
463 | sg = sgl->sg + i; | |
464 | if (sg->length <= assoclen) { | |
465 | /* AD is larger than one page */ | |
466 | sg_set_page(assoc + i, sg_page(sg), | |
467 | sg->length, sg->offset); | |
468 | assoclen -= sg->length; | |
469 | if (i >= ctx->tsgl.cur) | |
470 | goto unlock; | |
471 | } else if (!assoclen) { | |
472 | /* current page is to start of plaintext / ciphertext */ | |
473 | if (i) | |
474 | /* AD terminates at page boundary */ | |
475 | sg_mark_end(assoc + i - 1); | |
476 | else | |
477 | /* AD size is zero */ | |
478 | sg_mark_end(assoc); | |
479 | break; | |
480 | } else { | |
481 | /* AD does not terminate at page boundary */ | |
482 | sg_set_page(assoc + i, sg_page(sg), | |
483 | assoclen, sg->offset); | |
484 | sg_mark_end(assoc + i); | |
485 | /* plaintext / ciphertext starts after AD */ | |
486 | sg->length -= assoclen; | |
487 | sg->offset += assoclen; | |
488 | break; | |
489 | } | |
490 | } | |
491 | ||
492 | aead_request_set_assoc(&ctx->aead_req, assoc, ctx->aead_assoclen); | |
493 | aead_request_set_crypt(&ctx->aead_req, sg, ctx->rsgl[0].sg, used, | |
494 | ctx->iv); | |
495 | ||
496 | err = af_alg_wait_for_completion(ctx->enc ? | |
497 | crypto_aead_encrypt(&ctx->aead_req) : | |
498 | crypto_aead_decrypt(&ctx->aead_req), | |
499 | &ctx->completion); | |
500 | ||
501 | if (err) { | |
502 | /* EBADMSG implies a valid cipher operation took place */ | |
503 | if (err == -EBADMSG) | |
504 | aead_put_sgl(sk); | |
505 | goto unlock; | |
506 | } | |
507 | ||
508 | aead_put_sgl(sk); | |
509 | ||
510 | err = 0; | |
511 | ||
512 | unlock: | |
513 | for (i = 0; i < cnt; i++) | |
514 | af_alg_free_sg(&ctx->rsgl[i]); | |
515 | ||
516 | aead_wmem_wakeup(sk); | |
517 | release_sock(sk); | |
518 | ||
519 | return err ? err : outlen; | |
520 | } | |
521 | ||
522 | static unsigned int aead_poll(struct file *file, struct socket *sock, | |
523 | poll_table *wait) | |
524 | { | |
525 | struct sock *sk = sock->sk; | |
526 | struct alg_sock *ask = alg_sk(sk); | |
527 | struct aead_ctx *ctx = ask->private; | |
528 | unsigned int mask; | |
529 | ||
530 | sock_poll_wait(file, sk_sleep(sk), wait); | |
531 | mask = 0; | |
532 | ||
533 | if (!ctx->more) | |
534 | mask |= POLLIN | POLLRDNORM; | |
535 | ||
536 | if (aead_writable(sk)) | |
537 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
538 | ||
539 | return mask; | |
540 | } | |
541 | ||
542 | static struct proto_ops algif_aead_ops = { | |
543 | .family = PF_ALG, | |
544 | ||
545 | .connect = sock_no_connect, | |
546 | .socketpair = sock_no_socketpair, | |
547 | .getname = sock_no_getname, | |
548 | .ioctl = sock_no_ioctl, | |
549 | .listen = sock_no_listen, | |
550 | .shutdown = sock_no_shutdown, | |
551 | .getsockopt = sock_no_getsockopt, | |
552 | .mmap = sock_no_mmap, | |
553 | .bind = sock_no_bind, | |
554 | .accept = sock_no_accept, | |
555 | .setsockopt = sock_no_setsockopt, | |
556 | ||
557 | .release = af_alg_release, | |
558 | .sendmsg = aead_sendmsg, | |
559 | .sendpage = aead_sendpage, | |
560 | .recvmsg = aead_recvmsg, | |
561 | .poll = aead_poll, | |
562 | }; | |
563 | ||
564 | static void *aead_bind(const char *name, u32 type, u32 mask) | |
565 | { | |
566 | return crypto_alloc_aead(name, type, mask); | |
567 | } | |
568 | ||
569 | static void aead_release(void *private) | |
570 | { | |
571 | crypto_free_aead(private); | |
572 | } | |
573 | ||
574 | static int aead_setauthsize(void *private, unsigned int authsize) | |
575 | { | |
576 | return crypto_aead_setauthsize(private, authsize); | |
577 | } | |
578 | ||
579 | static int aead_setkey(void *private, const u8 *key, unsigned int keylen) | |
580 | { | |
581 | return crypto_aead_setkey(private, key, keylen); | |
582 | } | |
583 | ||
584 | static void aead_sock_destruct(struct sock *sk) | |
585 | { | |
586 | struct alg_sock *ask = alg_sk(sk); | |
587 | struct aead_ctx *ctx = ask->private; | |
588 | unsigned int ivlen = crypto_aead_ivsize( | |
589 | crypto_aead_reqtfm(&ctx->aead_req)); | |
590 | ||
591 | aead_put_sgl(sk); | |
592 | sock_kzfree_s(sk, ctx->iv, ivlen); | |
593 | sock_kfree_s(sk, ctx, ctx->len); | |
594 | af_alg_release_parent(sk); | |
595 | } | |
596 | ||
597 | static int aead_accept_parent(void *private, struct sock *sk) | |
598 | { | |
599 | struct aead_ctx *ctx; | |
600 | struct alg_sock *ask = alg_sk(sk); | |
601 | unsigned int len = sizeof(*ctx) + crypto_aead_reqsize(private); | |
602 | unsigned int ivlen = crypto_aead_ivsize(private); | |
603 | ||
604 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); | |
605 | if (!ctx) | |
606 | return -ENOMEM; | |
607 | memset(ctx, 0, len); | |
608 | ||
609 | ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL); | |
610 | if (!ctx->iv) { | |
611 | sock_kfree_s(sk, ctx, len); | |
612 | return -ENOMEM; | |
613 | } | |
614 | memset(ctx->iv, 0, ivlen); | |
615 | ||
616 | ctx->len = len; | |
617 | ctx->used = 0; | |
618 | ctx->more = 0; | |
619 | ctx->merge = 0; | |
620 | ctx->enc = 0; | |
621 | ctx->tsgl.cur = 0; | |
622 | ctx->aead_assoclen = 0; | |
623 | af_alg_init_completion(&ctx->completion); | |
624 | sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES); | |
625 | ||
626 | ask->private = ctx; | |
627 | ||
628 | aead_request_set_tfm(&ctx->aead_req, private); | |
629 | aead_request_set_callback(&ctx->aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
630 | af_alg_complete, &ctx->completion); | |
631 | ||
632 | sk->sk_destruct = aead_sock_destruct; | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | static const struct af_alg_type algif_type_aead = { | |
638 | .bind = aead_bind, | |
639 | .release = aead_release, | |
640 | .setkey = aead_setkey, | |
641 | .setauthsize = aead_setauthsize, | |
642 | .accept = aead_accept_parent, | |
643 | .ops = &algif_aead_ops, | |
644 | .name = "aead", | |
645 | .owner = THIS_MODULE | |
646 | }; | |
647 | ||
648 | static int __init algif_aead_init(void) | |
649 | { | |
650 | return af_alg_register_type(&algif_type_aead); | |
651 | } | |
652 | ||
653 | static void __exit algif_aead_exit(void) | |
654 | { | |
655 | int err = af_alg_unregister_type(&algif_type_aead); | |
656 | BUG_ON(err); | |
657 | } | |
658 | ||
659 | module_init(algif_aead_init); | |
660 | module_exit(algif_aead_exit); | |
661 | MODULE_LICENSE("GPL"); | |
662 | MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>"); | |
663 | MODULE_DESCRIPTION("AEAD kernel crypto API user space interface"); |