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1/*
2 * algif_skcipher: User-space interface for skcipher algorithms
3 *
4 * This file provides the user-space API for symmetric key ciphers.
5 *
6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 */
14
15#include <crypto/scatterwalk.h>
16#include <crypto/skcipher.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
26struct skcipher_sg_list {
27 struct list_head list;
28
29 int cur;
30
31 struct scatterlist sg[0];
32};
33
34struct skcipher_ctx {
35 struct list_head tsgl;
36 struct af_alg_sgl rsgl;
37
38 void *iv;
39
40 struct af_alg_completion completion;
41
42 unsigned used;
43
44 unsigned int len;
45 bool more;
46 bool merge;
47 bool enc;
48
49 struct ablkcipher_request req;
50};
51
52#define MAX_SGL_ENTS ((PAGE_SIZE - sizeof(struct skcipher_sg_list)) / \
53 sizeof(struct scatterlist) - 1)
54
55static inline int skcipher_sndbuf(struct sock *sk)
56{
57 struct alg_sock *ask = alg_sk(sk);
58 struct skcipher_ctx *ctx = ask->private;
59
60 return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
61 ctx->used, 0);
62}
63
64static inline bool skcipher_writable(struct sock *sk)
65{
66 return PAGE_SIZE <= skcipher_sndbuf(sk);
67}
68
69static int skcipher_alloc_sgl(struct sock *sk)
70{
71 struct alg_sock *ask = alg_sk(sk);
72 struct skcipher_ctx *ctx = ask->private;
73 struct skcipher_sg_list *sgl;
74 struct scatterlist *sg = NULL;
75
76 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
77 if (!list_empty(&ctx->tsgl))
78 sg = sgl->sg;
79
80 if (!sg || sgl->cur >= MAX_SGL_ENTS) {
81 sgl = sock_kmalloc(sk, sizeof(*sgl) +
82 sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1),
83 GFP_KERNEL);
84 if (!sgl)
85 return -ENOMEM;
86
87 sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
88 sgl->cur = 0;
89
90 if (sg)
91 scatterwalk_sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
92
93 list_add_tail(&sgl->list, &ctx->tsgl);
94 }
95
96 return 0;
97}
98
99static void skcipher_pull_sgl(struct sock *sk, int used)
100{
101 struct alg_sock *ask = alg_sk(sk);
102 struct skcipher_ctx *ctx = ask->private;
103 struct skcipher_sg_list *sgl;
104 struct scatterlist *sg;
105 int i;
106
107 while (!list_empty(&ctx->tsgl)) {
108 sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list,
109 list);
110 sg = sgl->sg;
111
112 for (i = 0; i < sgl->cur; i++) {
113 int plen = min_t(int, used, sg[i].length);
114
115 if (!sg_page(sg + i))
116 continue;
117
118 sg[i].length -= plen;
119 sg[i].offset += plen;
120
121 used -= plen;
122 ctx->used -= plen;
123
124 if (sg[i].length)
125 return;
126
127 put_page(sg_page(sg + i));
128 sg_assign_page(sg + i, NULL);
129 }
130
131 list_del(&sgl->list);
132 sock_kfree_s(sk, sgl,
133 sizeof(*sgl) + sizeof(sgl->sg[0]) *
134 (MAX_SGL_ENTS + 1));
135 }
136
137 if (!ctx->used)
138 ctx->merge = 0;
139}
140
141static void skcipher_free_sgl(struct sock *sk)
142{
143 struct alg_sock *ask = alg_sk(sk);
144 struct skcipher_ctx *ctx = ask->private;
145
146 skcipher_pull_sgl(sk, ctx->used);
147}
148
149static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags)
150{
151 long timeout;
152 DEFINE_WAIT(wait);
153 int err = -ERESTARTSYS;
154
155 if (flags & MSG_DONTWAIT)
156 return -EAGAIN;
157
158 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
159
160 for (;;) {
161 if (signal_pending(current))
162 break;
163 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
164 timeout = MAX_SCHEDULE_TIMEOUT;
165 if (sk_wait_event(sk, &timeout, skcipher_writable(sk))) {
166 err = 0;
167 break;
168 }
169 }
170 finish_wait(sk_sleep(sk), &wait);
171
172 return err;
173}
174
175static void skcipher_wmem_wakeup(struct sock *sk)
176{
177 struct socket_wq *wq;
178
179 if (!skcipher_writable(sk))
180 return;
181
182 rcu_read_lock();
183 wq = rcu_dereference(sk->sk_wq);
184 if (wq_has_sleeper(wq))
185 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
186 POLLRDNORM |
187 POLLRDBAND);
188 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
189 rcu_read_unlock();
190}
191
192static int skcipher_wait_for_data(struct sock *sk, unsigned flags)
193{
194 struct alg_sock *ask = alg_sk(sk);
195 struct skcipher_ctx *ctx = ask->private;
196 long timeout;
197 DEFINE_WAIT(wait);
198 int err = -ERESTARTSYS;
199
200 if (flags & MSG_DONTWAIT) {
201 return -EAGAIN;
202 }
203
204 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
205
206 for (;;) {
207 if (signal_pending(current))
208 break;
209 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
210 timeout = MAX_SCHEDULE_TIMEOUT;
211 if (sk_wait_event(sk, &timeout, ctx->used)) {
212 err = 0;
213 break;
214 }
215 }
216 finish_wait(sk_sleep(sk), &wait);
217
218 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
219
220 return err;
221}
222
223static void skcipher_data_wakeup(struct sock *sk)
224{
225 struct alg_sock *ask = alg_sk(sk);
226 struct skcipher_ctx *ctx = ask->private;
227 struct socket_wq *wq;
228
229 if (!ctx->used)
230 return;
231
232 rcu_read_lock();
233 wq = rcu_dereference(sk->sk_wq);
234 if (wq_has_sleeper(wq))
235 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
236 POLLRDNORM |
237 POLLRDBAND);
238 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
239 rcu_read_unlock();
240}
241
242static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock,
243 struct msghdr *msg, size_t size)
244{
245 struct sock *sk = sock->sk;
246 struct alg_sock *ask = alg_sk(sk);
247 struct skcipher_ctx *ctx = ask->private;
248 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
249 unsigned ivsize = crypto_ablkcipher_ivsize(tfm);
250 struct skcipher_sg_list *sgl;
251 struct af_alg_control con = {};
252 long copied = 0;
253 bool enc = 0;
254 int err;
255 int i;
256
257 if (msg->msg_controllen) {
258 err = af_alg_cmsg_send(msg, &con);
259 if (err)
260 return err;
261
262 switch (con.op) {
263 case ALG_OP_ENCRYPT:
264 enc = 1;
265 break;
266 case ALG_OP_DECRYPT:
267 enc = 0;
268 break;
269 default:
270 return -EINVAL;
271 }
272
273 if (con.iv && con.iv->ivlen != ivsize)
274 return -EINVAL;
275 }
276
277 err = -EINVAL;
278
279 lock_sock(sk);
280 if (!ctx->more && ctx->used)
281 goto unlock;
282
283 if (!ctx->used) {
284 ctx->enc = enc;
285 if (con.iv)
286 memcpy(ctx->iv, con.iv->iv, ivsize);
287 }
288
289 while (size) {
290 struct scatterlist *sg;
291 unsigned long len = size;
292 int plen;
293
294 if (ctx->merge) {
295 sgl = list_entry(ctx->tsgl.prev,
296 struct skcipher_sg_list, list);
297 sg = sgl->sg + sgl->cur - 1;
298 len = min_t(unsigned long, len,
299 PAGE_SIZE - sg->offset - sg->length);
300
301 err = memcpy_fromiovec(page_address(sg_page(sg)) +
302 sg->offset + sg->length,
303 msg->msg_iov, len);
304 if (err)
305 goto unlock;
306
307 sg->length += len;
308 ctx->merge = (sg->offset + sg->length) &
309 (PAGE_SIZE - 1);
310
311 ctx->used += len;
312 copied += len;
313 size -= len;
314 continue;
315 }
316
317 if (!skcipher_writable(sk)) {
318 err = skcipher_wait_for_wmem(sk, msg->msg_flags);
319 if (err)
320 goto unlock;
321 }
322
323 len = min_t(unsigned long, len, skcipher_sndbuf(sk));
324
325 err = skcipher_alloc_sgl(sk);
326 if (err)
327 goto unlock;
328
329 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
330 sg = sgl->sg;
331 do {
332 i = sgl->cur;
333 plen = min_t(int, len, PAGE_SIZE);
334
335 sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
336 err = -ENOMEM;
337 if (!sg_page(sg + i))
338 goto unlock;
339
340 err = memcpy_fromiovec(page_address(sg_page(sg + i)),
341 msg->msg_iov, plen);
342 if (err) {
343 __free_page(sg_page(sg + i));
344 sg_assign_page(sg + i, NULL);
345 goto unlock;
346 }
347
348 sg[i].length = plen;
349 len -= plen;
350 ctx->used += plen;
351 copied += plen;
352 size -= plen;
353 sgl->cur++;
354 } while (len && sgl->cur < MAX_SGL_ENTS);
355
356 ctx->merge = plen & (PAGE_SIZE - 1);
357 }
358
359 err = 0;
360
361 ctx->more = msg->msg_flags & MSG_MORE;
362 if (!ctx->more && !list_empty(&ctx->tsgl))
363 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
364
365unlock:
366 skcipher_data_wakeup(sk);
367 release_sock(sk);
368
369 return copied ?: err;
370}
371
372static ssize_t skcipher_sendpage(struct socket *sock, struct page *page,
373 int offset, size_t size, int flags)
374{
375 struct sock *sk = sock->sk;
376 struct alg_sock *ask = alg_sk(sk);
377 struct skcipher_ctx *ctx = ask->private;
378 struct skcipher_sg_list *sgl;
379 int err = -EINVAL;
380
381 if (flags & MSG_SENDPAGE_NOTLAST)
382 flags |= MSG_MORE;
383
384 lock_sock(sk);
385 if (!ctx->more && ctx->used)
386 goto unlock;
387
388 if (!size)
389 goto done;
390
391 if (!skcipher_writable(sk)) {
392 err = skcipher_wait_for_wmem(sk, flags);
393 if (err)
394 goto unlock;
395 }
396
397 err = skcipher_alloc_sgl(sk);
398 if (err)
399 goto unlock;
400
401 ctx->merge = 0;
402 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
403
404 get_page(page);
405 sg_set_page(sgl->sg + sgl->cur, page, size, offset);
406 sgl->cur++;
407 ctx->used += size;
408
409done:
410 ctx->more = flags & MSG_MORE;
411 if (!ctx->more && !list_empty(&ctx->tsgl))
412 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
413
414unlock:
415 skcipher_data_wakeup(sk);
416 release_sock(sk);
417
418 return err ?: size;
419}
420
421static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
422 struct msghdr *msg, size_t ignored, int flags)
423{
424 struct sock *sk = sock->sk;
425 struct alg_sock *ask = alg_sk(sk);
426 struct skcipher_ctx *ctx = ask->private;
427 unsigned bs = crypto_ablkcipher_blocksize(crypto_ablkcipher_reqtfm(
428 &ctx->req));
429 struct skcipher_sg_list *sgl;
430 struct scatterlist *sg;
431 unsigned long iovlen;
432 struct iovec *iov;
433 int err = -EAGAIN;
434 int used;
435 long copied = 0;
436
437 lock_sock(sk);
438 for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
439 iovlen--, iov++) {
440 unsigned long seglen = iov->iov_len;
441 char __user *from = iov->iov_base;
442
443 while (seglen) {
444 sgl = list_first_entry(&ctx->tsgl,
445 struct skcipher_sg_list, list);
446 sg = sgl->sg;
447
448 while (!sg->length)
449 sg++;
450
451 used = ctx->used;
452 if (!used) {
453 err = skcipher_wait_for_data(sk, flags);
454 if (err)
455 goto unlock;
456 }
457
458 used = min_t(unsigned long, used, seglen);
459
460 used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
461 err = used;
462 if (err < 0)
463 goto unlock;
464
465 if (ctx->more || used < ctx->used)
466 used -= used % bs;
467
468 err = -EINVAL;
469 if (!used)
470 goto free;
471
472 ablkcipher_request_set_crypt(&ctx->req, sg,
473 ctx->rsgl.sg, used,
474 ctx->iv);
475
476 err = af_alg_wait_for_completion(
477 ctx->enc ?
478 crypto_ablkcipher_encrypt(&ctx->req) :
479 crypto_ablkcipher_decrypt(&ctx->req),
480 &ctx->completion);
481
482free:
483 af_alg_free_sg(&ctx->rsgl);
484
485 if (err)
486 goto unlock;
487
488 copied += used;
489 from += used;
490 seglen -= used;
491 skcipher_pull_sgl(sk, used);
492 }
493 }
494
495 err = 0;
496
497unlock:
498 skcipher_wmem_wakeup(sk);
499 release_sock(sk);
500
501 return copied ?: err;
502}
503
504
505static unsigned int skcipher_poll(struct file *file, struct socket *sock,
506 poll_table *wait)
507{
508 struct sock *sk = sock->sk;
509 struct alg_sock *ask = alg_sk(sk);
510 struct skcipher_ctx *ctx = ask->private;
511 unsigned int mask;
512
513 sock_poll_wait(file, sk_sleep(sk), wait);
514 mask = 0;
515
516 if (ctx->used)
517 mask |= POLLIN | POLLRDNORM;
518
519 if (skcipher_writable(sk))
520 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
521
522 return mask;
523}
524
525static struct proto_ops algif_skcipher_ops = {
526 .family = PF_ALG,
527
528 .connect = sock_no_connect,
529 .socketpair = sock_no_socketpair,
530 .getname = sock_no_getname,
531 .ioctl = sock_no_ioctl,
532 .listen = sock_no_listen,
533 .shutdown = sock_no_shutdown,
534 .getsockopt = sock_no_getsockopt,
535 .mmap = sock_no_mmap,
536 .bind = sock_no_bind,
537 .accept = sock_no_accept,
538 .setsockopt = sock_no_setsockopt,
539
540 .release = af_alg_release,
541 .sendmsg = skcipher_sendmsg,
542 .sendpage = skcipher_sendpage,
543 .recvmsg = skcipher_recvmsg,
544 .poll = skcipher_poll,
545};
546
547static void *skcipher_bind(const char *name, u32 type, u32 mask)
548{
549 return crypto_alloc_ablkcipher(name, type, mask);
550}
551
552static void skcipher_release(void *private)
553{
554 crypto_free_ablkcipher(private);
555}
556
557static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
558{
559 return crypto_ablkcipher_setkey(private, key, keylen);
560}
561
562static void skcipher_sock_destruct(struct sock *sk)
563{
564 struct alg_sock *ask = alg_sk(sk);
565 struct skcipher_ctx *ctx = ask->private;
566 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
567
568 skcipher_free_sgl(sk);
569 sock_kfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
570 sock_kfree_s(sk, ctx, ctx->len);
571 af_alg_release_parent(sk);
572}
573
574static int skcipher_accept_parent(void *private, struct sock *sk)
575{
576 struct skcipher_ctx *ctx;
577 struct alg_sock *ask = alg_sk(sk);
578 unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(private);
579
580 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
581 if (!ctx)
582 return -ENOMEM;
583
584 ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(private),
585 GFP_KERNEL);
586 if (!ctx->iv) {
587 sock_kfree_s(sk, ctx, len);
588 return -ENOMEM;
589 }
590
591 memset(ctx->iv, 0, crypto_ablkcipher_ivsize(private));
592
593 INIT_LIST_HEAD(&ctx->tsgl);
594 ctx->len = len;
595 ctx->used = 0;
596 ctx->more = 0;
597 ctx->merge = 0;
598 ctx->enc = 0;
599 af_alg_init_completion(&ctx->completion);
600
601 ask->private = ctx;
602
603 ablkcipher_request_set_tfm(&ctx->req, private);
604 ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
605 af_alg_complete, &ctx->completion);
606
607 sk->sk_destruct = skcipher_sock_destruct;
608
609 return 0;
610}
611
612static const struct af_alg_type algif_type_skcipher = {
613 .bind = skcipher_bind,
614 .release = skcipher_release,
615 .setkey = skcipher_setkey,
616 .accept = skcipher_accept_parent,
617 .ops = &algif_skcipher_ops,
618 .name = "skcipher",
619 .owner = THIS_MODULE
620};
621
622static int __init algif_skcipher_init(void)
623{
624 return af_alg_register_type(&algif_type_skcipher);
625}
626
627static void __exit algif_skcipher_exit(void)
628{
629 int err = af_alg_unregister_type(&algif_type_skcipher);
630 BUG_ON(err);
631}
632
633module_init(algif_skcipher_init);
634module_exit(algif_skcipher_exit);
635MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * algif_skcipher: User-space interface for skcipher algorithms
4 *
5 * This file provides the user-space API for symmetric key ciphers.
6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * The following concept of the memory management is used:
10 *
11 * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
12 * filled by user space with the data submitted via sendpage/sendmsg. Filling
13 * up the TX SGL does not cause a crypto operation -- the data will only be
14 * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
15 * provide a buffer which is tracked with the RX SGL.
16 *
17 * During the processing of the recvmsg operation, the cipher request is
18 * allocated and prepared. As part of the recvmsg operation, the processed
19 * TX buffers are extracted from the TX SGL into a separate SGL.
20 *
21 * After the completion of the crypto operation, the RX SGL and the cipher
22 * request is released. The extracted TX SGL parts are released together with
23 * the RX SGL release.
24 */
25
26#include <crypto/scatterwalk.h>
27#include <crypto/skcipher.h>
28#include <crypto/if_alg.h>
29#include <linux/init.h>
30#include <linux/list.h>
31#include <linux/kernel.h>
32#include <linux/mm.h>
33#include <linux/module.h>
34#include <linux/net.h>
35#include <net/sock.h>
36
37static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
38 size_t size)
39{
40 struct sock *sk = sock->sk;
41 struct alg_sock *ask = alg_sk(sk);
42 struct sock *psk = ask->parent;
43 struct alg_sock *pask = alg_sk(psk);
44 struct crypto_skcipher *tfm = pask->private;
45 unsigned ivsize = crypto_skcipher_ivsize(tfm);
46
47 return af_alg_sendmsg(sock, msg, size, ivsize);
48}
49
50static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
51 size_t ignored, int flags)
52{
53 struct sock *sk = sock->sk;
54 struct alg_sock *ask = alg_sk(sk);
55 struct sock *psk = ask->parent;
56 struct alg_sock *pask = alg_sk(psk);
57 struct af_alg_ctx *ctx = ask->private;
58 struct crypto_skcipher *tfm = pask->private;
59 unsigned int bs = crypto_skcipher_blocksize(tfm);
60 struct af_alg_async_req *areq;
61 int err = 0;
62 size_t len = 0;
63
64 if (!ctx->used) {
65 err = af_alg_wait_for_data(sk, flags);
66 if (err)
67 return err;
68 }
69
70 /* Allocate cipher request for current operation. */
71 areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
72 crypto_skcipher_reqsize(tfm));
73 if (IS_ERR(areq))
74 return PTR_ERR(areq);
75
76 /* convert iovecs of output buffers into RX SGL */
77 err = af_alg_get_rsgl(sk, msg, flags, areq, -1, &len);
78 if (err)
79 goto free;
80
81 /* Process only as much RX buffers for which we have TX data */
82 if (len > ctx->used)
83 len = ctx->used;
84
85 /*
86 * If more buffers are to be expected to be processed, process only
87 * full block size buffers.
88 */
89 if (ctx->more || len < ctx->used)
90 len -= len % bs;
91
92 /*
93 * Create a per request TX SGL for this request which tracks the
94 * SG entries from the global TX SGL.
95 */
96 areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0);
97 if (!areq->tsgl_entries)
98 areq->tsgl_entries = 1;
99 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
100 areq->tsgl_entries),
101 GFP_KERNEL);
102 if (!areq->tsgl) {
103 err = -ENOMEM;
104 goto free;
105 }
106 sg_init_table(areq->tsgl, areq->tsgl_entries);
107 af_alg_pull_tsgl(sk, len, areq->tsgl, 0);
108
109 /* Initialize the crypto operation */
110 skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
111 skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
112 areq->first_rsgl.sgl.sg, len, ctx->iv);
113
114 if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
115 /* AIO operation */
116 sock_hold(sk);
117 areq->iocb = msg->msg_iocb;
118
119 /* Remember output size that will be generated. */
120 areq->outlen = len;
121
122 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
123 CRYPTO_TFM_REQ_MAY_SLEEP,
124 af_alg_async_cb, areq);
125 err = ctx->enc ?
126 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
127 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
128
129 /* AIO operation in progress */
130 if (err == -EINPROGRESS || err == -EBUSY)
131 return -EIOCBQUEUED;
132
133 sock_put(sk);
134 } else {
135 /* Synchronous operation */
136 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
137 CRYPTO_TFM_REQ_MAY_SLEEP |
138 CRYPTO_TFM_REQ_MAY_BACKLOG,
139 crypto_req_done, &ctx->wait);
140 err = crypto_wait_req(ctx->enc ?
141 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
142 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req),
143 &ctx->wait);
144 }
145
146
147free:
148 af_alg_free_resources(areq);
149
150 return err ? err : len;
151}
152
153static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
154 size_t ignored, int flags)
155{
156 struct sock *sk = sock->sk;
157 int ret = 0;
158
159 lock_sock(sk);
160 while (msg_data_left(msg)) {
161 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
162
163 /*
164 * This error covers -EIOCBQUEUED which implies that we can
165 * only handle one AIO request. If the caller wants to have
166 * multiple AIO requests in parallel, he must make multiple
167 * separate AIO calls.
168 *
169 * Also return the error if no data has been processed so far.
170 */
171 if (err <= 0) {
172 if (err == -EIOCBQUEUED || !ret)
173 ret = err;
174 goto out;
175 }
176
177 ret += err;
178 }
179
180out:
181 af_alg_wmem_wakeup(sk);
182 release_sock(sk);
183 return ret;
184}
185
186static struct proto_ops algif_skcipher_ops = {
187 .family = PF_ALG,
188
189 .connect = sock_no_connect,
190 .socketpair = sock_no_socketpair,
191 .getname = sock_no_getname,
192 .ioctl = sock_no_ioctl,
193 .listen = sock_no_listen,
194 .shutdown = sock_no_shutdown,
195 .getsockopt = sock_no_getsockopt,
196 .mmap = sock_no_mmap,
197 .bind = sock_no_bind,
198 .accept = sock_no_accept,
199 .setsockopt = sock_no_setsockopt,
200
201 .release = af_alg_release,
202 .sendmsg = skcipher_sendmsg,
203 .sendpage = af_alg_sendpage,
204 .recvmsg = skcipher_recvmsg,
205 .poll = af_alg_poll,
206};
207
208static int skcipher_check_key(struct socket *sock)
209{
210 int err = 0;
211 struct sock *psk;
212 struct alg_sock *pask;
213 struct crypto_skcipher *tfm;
214 struct sock *sk = sock->sk;
215 struct alg_sock *ask = alg_sk(sk);
216
217 lock_sock(sk);
218 if (ask->refcnt)
219 goto unlock_child;
220
221 psk = ask->parent;
222 pask = alg_sk(ask->parent);
223 tfm = pask->private;
224
225 err = -ENOKEY;
226 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
227 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
228 goto unlock;
229
230 if (!pask->refcnt++)
231 sock_hold(psk);
232
233 ask->refcnt = 1;
234 sock_put(psk);
235
236 err = 0;
237
238unlock:
239 release_sock(psk);
240unlock_child:
241 release_sock(sk);
242
243 return err;
244}
245
246static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
247 size_t size)
248{
249 int err;
250
251 err = skcipher_check_key(sock);
252 if (err)
253 return err;
254
255 return skcipher_sendmsg(sock, msg, size);
256}
257
258static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
259 int offset, size_t size, int flags)
260{
261 int err;
262
263 err = skcipher_check_key(sock);
264 if (err)
265 return err;
266
267 return af_alg_sendpage(sock, page, offset, size, flags);
268}
269
270static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
271 size_t ignored, int flags)
272{
273 int err;
274
275 err = skcipher_check_key(sock);
276 if (err)
277 return err;
278
279 return skcipher_recvmsg(sock, msg, ignored, flags);
280}
281
282static struct proto_ops algif_skcipher_ops_nokey = {
283 .family = PF_ALG,
284
285 .connect = sock_no_connect,
286 .socketpair = sock_no_socketpair,
287 .getname = sock_no_getname,
288 .ioctl = sock_no_ioctl,
289 .listen = sock_no_listen,
290 .shutdown = sock_no_shutdown,
291 .getsockopt = sock_no_getsockopt,
292 .mmap = sock_no_mmap,
293 .bind = sock_no_bind,
294 .accept = sock_no_accept,
295 .setsockopt = sock_no_setsockopt,
296
297 .release = af_alg_release,
298 .sendmsg = skcipher_sendmsg_nokey,
299 .sendpage = skcipher_sendpage_nokey,
300 .recvmsg = skcipher_recvmsg_nokey,
301 .poll = af_alg_poll,
302};
303
304static void *skcipher_bind(const char *name, u32 type, u32 mask)
305{
306 return crypto_alloc_skcipher(name, type, mask);
307}
308
309static void skcipher_release(void *private)
310{
311 crypto_free_skcipher(private);
312}
313
314static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
315{
316 return crypto_skcipher_setkey(private, key, keylen);
317}
318
319static void skcipher_sock_destruct(struct sock *sk)
320{
321 struct alg_sock *ask = alg_sk(sk);
322 struct af_alg_ctx *ctx = ask->private;
323 struct sock *psk = ask->parent;
324 struct alg_sock *pask = alg_sk(psk);
325 struct crypto_skcipher *tfm = pask->private;
326
327 af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
328 sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm));
329 sock_kfree_s(sk, ctx, ctx->len);
330 af_alg_release_parent(sk);
331}
332
333static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
334{
335 struct af_alg_ctx *ctx;
336 struct alg_sock *ask = alg_sk(sk);
337 struct crypto_skcipher *tfm = private;
338 unsigned int len = sizeof(*ctx);
339
340 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
341 if (!ctx)
342 return -ENOMEM;
343
344 ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
345 GFP_KERNEL);
346 if (!ctx->iv) {
347 sock_kfree_s(sk, ctx, len);
348 return -ENOMEM;
349 }
350
351 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
352
353 INIT_LIST_HEAD(&ctx->tsgl_list);
354 ctx->len = len;
355 ctx->used = 0;
356 atomic_set(&ctx->rcvused, 0);
357 ctx->more = 0;
358 ctx->merge = 0;
359 ctx->enc = 0;
360 crypto_init_wait(&ctx->wait);
361
362 ask->private = ctx;
363
364 sk->sk_destruct = skcipher_sock_destruct;
365
366 return 0;
367}
368
369static int skcipher_accept_parent(void *private, struct sock *sk)
370{
371 struct crypto_skcipher *tfm = private;
372
373 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
374 return -ENOKEY;
375
376 return skcipher_accept_parent_nokey(private, sk);
377}
378
379static const struct af_alg_type algif_type_skcipher = {
380 .bind = skcipher_bind,
381 .release = skcipher_release,
382 .setkey = skcipher_setkey,
383 .accept = skcipher_accept_parent,
384 .accept_nokey = skcipher_accept_parent_nokey,
385 .ops = &algif_skcipher_ops,
386 .ops_nokey = &algif_skcipher_ops_nokey,
387 .name = "skcipher",
388 .owner = THIS_MODULE
389};
390
391static int __init algif_skcipher_init(void)
392{
393 return af_alg_register_type(&algif_type_skcipher);
394}
395
396static void __exit algif_skcipher_exit(void)
397{
398 int err = af_alg_unregister_type(&algif_type_skcipher);
399 BUG_ON(err);
400}
401
402module_init(algif_skcipher_init);
403module_exit(algif_skcipher_exit);
404MODULE_LICENSE("GPL");