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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * algif_hash: User-space interface for hash algorithms
4 *
5 * This file provides the user-space API for hash algorithms.
6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 */
9
10#include <crypto/hash.h>
11#include <crypto/if_alg.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/module.h>
16#include <linux/net.h>
17#include <net/sock.h>
18
19struct hash_ctx {
20 struct af_alg_sgl sgl;
21
22 u8 *result;
23
24 struct crypto_wait wait;
25
26 unsigned int len;
27 bool more;
28
29 struct ahash_request req;
30};
31
32static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
33{
34 unsigned ds;
35
36 if (ctx->result)
37 return 0;
38
39 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
40
41 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
42 if (!ctx->result)
43 return -ENOMEM;
44
45 memset(ctx->result, 0, ds);
46
47 return 0;
48}
49
50static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
51{
52 unsigned ds;
53
54 if (!ctx->result)
55 return;
56
57 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
58
59 sock_kzfree_s(sk, ctx->result, ds);
60 ctx->result = NULL;
61}
62
63static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
64 size_t ignored)
65{
66 int limit = ALG_MAX_PAGES * PAGE_SIZE;
67 struct sock *sk = sock->sk;
68 struct alg_sock *ask = alg_sk(sk);
69 struct hash_ctx *ctx = ask->private;
70 long copied = 0;
71 int err;
72
73 if (limit > sk->sk_sndbuf)
74 limit = sk->sk_sndbuf;
75
76 lock_sock(sk);
77 if (!ctx->more) {
78 if ((msg->msg_flags & MSG_MORE))
79 hash_free_result(sk, ctx);
80
81 err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
82 if (err)
83 goto unlock;
84 }
85
86 ctx->more = false;
87
88 while (msg_data_left(msg)) {
89 int len = msg_data_left(msg);
90
91 if (len > limit)
92 len = limit;
93
94 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
95 if (len < 0) {
96 err = copied ? 0 : len;
97 goto unlock;
98 }
99
100 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
101
102 err = crypto_wait_req(crypto_ahash_update(&ctx->req),
103 &ctx->wait);
104 af_alg_free_sg(&ctx->sgl);
105 if (err) {
106 iov_iter_revert(&msg->msg_iter, len);
107 goto unlock;
108 }
109
110 copied += len;
111 }
112
113 err = 0;
114
115 ctx->more = msg->msg_flags & MSG_MORE;
116 if (!ctx->more) {
117 err = hash_alloc_result(sk, ctx);
118 if (err)
119 goto unlock;
120
121 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
122 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
123 &ctx->wait);
124 }
125
126unlock:
127 release_sock(sk);
128
129 return err ?: copied;
130}
131
132static ssize_t hash_sendpage(struct socket *sock, struct page *page,
133 int offset, size_t size, int flags)
134{
135 struct sock *sk = sock->sk;
136 struct alg_sock *ask = alg_sk(sk);
137 struct hash_ctx *ctx = ask->private;
138 int err;
139
140 if (flags & MSG_SENDPAGE_NOTLAST)
141 flags |= MSG_MORE;
142
143 lock_sock(sk);
144 sg_init_table(ctx->sgl.sg, 1);
145 sg_set_page(ctx->sgl.sg, page, size, offset);
146
147 if (!(flags & MSG_MORE)) {
148 err = hash_alloc_result(sk, ctx);
149 if (err)
150 goto unlock;
151 } else if (!ctx->more)
152 hash_free_result(sk, ctx);
153
154 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
155
156 if (!(flags & MSG_MORE)) {
157 if (ctx->more)
158 err = crypto_ahash_finup(&ctx->req);
159 else
160 err = crypto_ahash_digest(&ctx->req);
161 } else {
162 if (!ctx->more) {
163 err = crypto_ahash_init(&ctx->req);
164 err = crypto_wait_req(err, &ctx->wait);
165 if (err)
166 goto unlock;
167 }
168
169 err = crypto_ahash_update(&ctx->req);
170 }
171
172 err = crypto_wait_req(err, &ctx->wait);
173 if (err)
174 goto unlock;
175
176 ctx->more = flags & MSG_MORE;
177
178unlock:
179 release_sock(sk);
180
181 return err ?: size;
182}
183
184static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
185 int flags)
186{
187 struct sock *sk = sock->sk;
188 struct alg_sock *ask = alg_sk(sk);
189 struct hash_ctx *ctx = ask->private;
190 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
191 bool result;
192 int err;
193
194 if (len > ds)
195 len = ds;
196 else if (len < ds)
197 msg->msg_flags |= MSG_TRUNC;
198
199 lock_sock(sk);
200 result = ctx->result;
201 err = hash_alloc_result(sk, ctx);
202 if (err)
203 goto unlock;
204
205 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
206
207 if (!result && !ctx->more) {
208 err = crypto_wait_req(crypto_ahash_init(&ctx->req),
209 &ctx->wait);
210 if (err)
211 goto unlock;
212 }
213
214 if (!result || ctx->more) {
215 ctx->more = false;
216 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
217 &ctx->wait);
218 if (err)
219 goto unlock;
220 }
221
222 err = memcpy_to_msg(msg, ctx->result, len);
223
224unlock:
225 hash_free_result(sk, ctx);
226 release_sock(sk);
227
228 return err ?: len;
229}
230
231static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
232 bool kern)
233{
234 struct sock *sk = sock->sk;
235 struct alg_sock *ask = alg_sk(sk);
236 struct hash_ctx *ctx = ask->private;
237 struct ahash_request *req = &ctx->req;
238 char state[HASH_MAX_STATESIZE];
239 struct sock *sk2;
240 struct alg_sock *ask2;
241 struct hash_ctx *ctx2;
242 bool more;
243 int err;
244
245 lock_sock(sk);
246 more = ctx->more;
247 err = more ? crypto_ahash_export(req, state) : 0;
248 release_sock(sk);
249
250 if (err)
251 return err;
252
253 err = af_alg_accept(ask->parent, newsock, kern);
254 if (err)
255 return err;
256
257 sk2 = newsock->sk;
258 ask2 = alg_sk(sk2);
259 ctx2 = ask2->private;
260 ctx2->more = more;
261
262 if (!more)
263 return err;
264
265 err = crypto_ahash_import(&ctx2->req, state);
266 if (err) {
267 sock_orphan(sk2);
268 sock_put(sk2);
269 }
270
271 return err;
272}
273
274static struct proto_ops algif_hash_ops = {
275 .family = PF_ALG,
276
277 .connect = sock_no_connect,
278 .socketpair = sock_no_socketpair,
279 .getname = sock_no_getname,
280 .ioctl = sock_no_ioctl,
281 .listen = sock_no_listen,
282 .shutdown = sock_no_shutdown,
283 .mmap = sock_no_mmap,
284 .bind = sock_no_bind,
285
286 .release = af_alg_release,
287 .sendmsg = hash_sendmsg,
288 .sendpage = hash_sendpage,
289 .recvmsg = hash_recvmsg,
290 .accept = hash_accept,
291};
292
293static int hash_check_key(struct socket *sock)
294{
295 int err = 0;
296 struct sock *psk;
297 struct alg_sock *pask;
298 struct crypto_ahash *tfm;
299 struct sock *sk = sock->sk;
300 struct alg_sock *ask = alg_sk(sk);
301
302 lock_sock(sk);
303 if (!atomic_read(&ask->nokey_refcnt))
304 goto unlock_child;
305
306 psk = ask->parent;
307 pask = alg_sk(ask->parent);
308 tfm = pask->private;
309
310 err = -ENOKEY;
311 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
312 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
313 goto unlock;
314
315 atomic_dec(&pask->nokey_refcnt);
316 atomic_set(&ask->nokey_refcnt, 0);
317
318 err = 0;
319
320unlock:
321 release_sock(psk);
322unlock_child:
323 release_sock(sk);
324
325 return err;
326}
327
328static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
329 size_t size)
330{
331 int err;
332
333 err = hash_check_key(sock);
334 if (err)
335 return err;
336
337 return hash_sendmsg(sock, msg, size);
338}
339
340static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
341 int offset, size_t size, int flags)
342{
343 int err;
344
345 err = hash_check_key(sock);
346 if (err)
347 return err;
348
349 return hash_sendpage(sock, page, offset, size, flags);
350}
351
352static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
353 size_t ignored, int flags)
354{
355 int err;
356
357 err = hash_check_key(sock);
358 if (err)
359 return err;
360
361 return hash_recvmsg(sock, msg, ignored, flags);
362}
363
364static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
365 int flags, bool kern)
366{
367 int err;
368
369 err = hash_check_key(sock);
370 if (err)
371 return err;
372
373 return hash_accept(sock, newsock, flags, kern);
374}
375
376static struct proto_ops algif_hash_ops_nokey = {
377 .family = PF_ALG,
378
379 .connect = sock_no_connect,
380 .socketpair = sock_no_socketpair,
381 .getname = sock_no_getname,
382 .ioctl = sock_no_ioctl,
383 .listen = sock_no_listen,
384 .shutdown = sock_no_shutdown,
385 .mmap = sock_no_mmap,
386 .bind = sock_no_bind,
387
388 .release = af_alg_release,
389 .sendmsg = hash_sendmsg_nokey,
390 .sendpage = hash_sendpage_nokey,
391 .recvmsg = hash_recvmsg_nokey,
392 .accept = hash_accept_nokey,
393};
394
395static void *hash_bind(const char *name, u32 type, u32 mask)
396{
397 return crypto_alloc_ahash(name, type, mask);
398}
399
400static void hash_release(void *private)
401{
402 crypto_free_ahash(private);
403}
404
405static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
406{
407 return crypto_ahash_setkey(private, key, keylen);
408}
409
410static void hash_sock_destruct(struct sock *sk)
411{
412 struct alg_sock *ask = alg_sk(sk);
413 struct hash_ctx *ctx = ask->private;
414
415 hash_free_result(sk, ctx);
416 sock_kfree_s(sk, ctx, ctx->len);
417 af_alg_release_parent(sk);
418}
419
420static int hash_accept_parent_nokey(void *private, struct sock *sk)
421{
422 struct crypto_ahash *tfm = private;
423 struct alg_sock *ask = alg_sk(sk);
424 struct hash_ctx *ctx;
425 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
426
427 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
428 if (!ctx)
429 return -ENOMEM;
430
431 ctx->result = NULL;
432 ctx->len = len;
433 ctx->more = false;
434 crypto_init_wait(&ctx->wait);
435
436 ask->private = ctx;
437
438 ahash_request_set_tfm(&ctx->req, tfm);
439 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
440 crypto_req_done, &ctx->wait);
441
442 sk->sk_destruct = hash_sock_destruct;
443
444 return 0;
445}
446
447static int hash_accept_parent(void *private, struct sock *sk)
448{
449 struct crypto_ahash *tfm = private;
450
451 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
452 return -ENOKEY;
453
454 return hash_accept_parent_nokey(private, sk);
455}
456
457static const struct af_alg_type algif_type_hash = {
458 .bind = hash_bind,
459 .release = hash_release,
460 .setkey = hash_setkey,
461 .accept = hash_accept_parent,
462 .accept_nokey = hash_accept_parent_nokey,
463 .ops = &algif_hash_ops,
464 .ops_nokey = &algif_hash_ops_nokey,
465 .name = "hash",
466 .owner = THIS_MODULE
467};
468
469static int __init algif_hash_init(void)
470{
471 return af_alg_register_type(&algif_type_hash);
472}
473
474static void __exit algif_hash_exit(void)
475{
476 int err = af_alg_unregister_type(&algif_type_hash);
477 BUG_ON(err);
478}
479
480module_init(algif_hash_init);
481module_exit(algif_hash_exit);
482MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * algif_hash: User-space interface for hash algorithms
4 *
5 * This file provides the user-space API for hash algorithms.
6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 */
9
10#include <crypto/hash.h>
11#include <crypto/if_alg.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/module.h>
16#include <linux/net.h>
17#include <net/sock.h>
18
19struct hash_ctx {
20 struct af_alg_sgl sgl;
21
22 u8 *result;
23
24 struct crypto_wait wait;
25
26 unsigned int len;
27 bool more;
28
29 struct ahash_request req;
30};
31
32static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
33{
34 unsigned ds;
35
36 if (ctx->result)
37 return 0;
38
39 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
40
41 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
42 if (!ctx->result)
43 return -ENOMEM;
44
45 memset(ctx->result, 0, ds);
46
47 return 0;
48}
49
50static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
51{
52 unsigned ds;
53
54 if (!ctx->result)
55 return;
56
57 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
58
59 sock_kzfree_s(sk, ctx->result, ds);
60 ctx->result = NULL;
61}
62
63static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
64 size_t ignored)
65{
66 int limit = ALG_MAX_PAGES * PAGE_SIZE;
67 struct sock *sk = sock->sk;
68 struct alg_sock *ask = alg_sk(sk);
69 struct hash_ctx *ctx = ask->private;
70 long copied = 0;
71 int err;
72
73 if (limit > sk->sk_sndbuf)
74 limit = sk->sk_sndbuf;
75
76 lock_sock(sk);
77 if (!ctx->more) {
78 if ((msg->msg_flags & MSG_MORE))
79 hash_free_result(sk, ctx);
80
81 err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
82 if (err)
83 goto unlock;
84 }
85
86 ctx->more = 0;
87
88 while (msg_data_left(msg)) {
89 int len = msg_data_left(msg);
90
91 if (len > limit)
92 len = limit;
93
94 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
95 if (len < 0) {
96 err = copied ? 0 : len;
97 goto unlock;
98 }
99
100 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
101
102 err = crypto_wait_req(crypto_ahash_update(&ctx->req),
103 &ctx->wait);
104 af_alg_free_sg(&ctx->sgl);
105 if (err)
106 goto unlock;
107
108 copied += len;
109 iov_iter_advance(&msg->msg_iter, len);
110 }
111
112 err = 0;
113
114 ctx->more = msg->msg_flags & MSG_MORE;
115 if (!ctx->more) {
116 err = hash_alloc_result(sk, ctx);
117 if (err)
118 goto unlock;
119
120 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
121 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
122 &ctx->wait);
123 }
124
125unlock:
126 release_sock(sk);
127
128 return err ?: copied;
129}
130
131static ssize_t hash_sendpage(struct socket *sock, struct page *page,
132 int offset, size_t size, int flags)
133{
134 struct sock *sk = sock->sk;
135 struct alg_sock *ask = alg_sk(sk);
136 struct hash_ctx *ctx = ask->private;
137 int err;
138
139 if (flags & MSG_SENDPAGE_NOTLAST)
140 flags |= MSG_MORE;
141
142 lock_sock(sk);
143 sg_init_table(ctx->sgl.sg, 1);
144 sg_set_page(ctx->sgl.sg, page, size, offset);
145
146 if (!(flags & MSG_MORE)) {
147 err = hash_alloc_result(sk, ctx);
148 if (err)
149 goto unlock;
150 } else if (!ctx->more)
151 hash_free_result(sk, ctx);
152
153 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
154
155 if (!(flags & MSG_MORE)) {
156 if (ctx->more)
157 err = crypto_ahash_finup(&ctx->req);
158 else
159 err = crypto_ahash_digest(&ctx->req);
160 } else {
161 if (!ctx->more) {
162 err = crypto_ahash_init(&ctx->req);
163 err = crypto_wait_req(err, &ctx->wait);
164 if (err)
165 goto unlock;
166 }
167
168 err = crypto_ahash_update(&ctx->req);
169 }
170
171 err = crypto_wait_req(err, &ctx->wait);
172 if (err)
173 goto unlock;
174
175 ctx->more = flags & MSG_MORE;
176
177unlock:
178 release_sock(sk);
179
180 return err ?: size;
181}
182
183static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
184 int flags)
185{
186 struct sock *sk = sock->sk;
187 struct alg_sock *ask = alg_sk(sk);
188 struct hash_ctx *ctx = ask->private;
189 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
190 bool result;
191 int err;
192
193 if (len > ds)
194 len = ds;
195 else if (len < ds)
196 msg->msg_flags |= MSG_TRUNC;
197
198 lock_sock(sk);
199 result = ctx->result;
200 err = hash_alloc_result(sk, ctx);
201 if (err)
202 goto unlock;
203
204 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
205
206 if (!result && !ctx->more) {
207 err = crypto_wait_req(crypto_ahash_init(&ctx->req),
208 &ctx->wait);
209 if (err)
210 goto unlock;
211 }
212
213 if (!result || ctx->more) {
214 ctx->more = 0;
215 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
216 &ctx->wait);
217 if (err)
218 goto unlock;
219 }
220
221 err = memcpy_to_msg(msg, ctx->result, len);
222
223unlock:
224 hash_free_result(sk, ctx);
225 release_sock(sk);
226
227 return err ?: len;
228}
229
230static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
231 bool kern)
232{
233 struct sock *sk = sock->sk;
234 struct alg_sock *ask = alg_sk(sk);
235 struct hash_ctx *ctx = ask->private;
236 struct ahash_request *req = &ctx->req;
237 char state[HASH_MAX_STATESIZE];
238 struct sock *sk2;
239 struct alg_sock *ask2;
240 struct hash_ctx *ctx2;
241 bool more;
242 int err;
243
244 lock_sock(sk);
245 more = ctx->more;
246 err = more ? crypto_ahash_export(req, state) : 0;
247 release_sock(sk);
248
249 if (err)
250 return err;
251
252 err = af_alg_accept(ask->parent, newsock, kern);
253 if (err)
254 return err;
255
256 sk2 = newsock->sk;
257 ask2 = alg_sk(sk2);
258 ctx2 = ask2->private;
259 ctx2->more = more;
260
261 if (!more)
262 return err;
263
264 err = crypto_ahash_import(&ctx2->req, state);
265 if (err) {
266 sock_orphan(sk2);
267 sock_put(sk2);
268 }
269
270 return err;
271}
272
273static struct proto_ops algif_hash_ops = {
274 .family = PF_ALG,
275
276 .connect = sock_no_connect,
277 .socketpair = sock_no_socketpair,
278 .getname = sock_no_getname,
279 .ioctl = sock_no_ioctl,
280 .listen = sock_no_listen,
281 .shutdown = sock_no_shutdown,
282 .getsockopt = sock_no_getsockopt,
283 .mmap = sock_no_mmap,
284 .bind = sock_no_bind,
285 .setsockopt = sock_no_setsockopt,
286
287 .release = af_alg_release,
288 .sendmsg = hash_sendmsg,
289 .sendpage = hash_sendpage,
290 .recvmsg = hash_recvmsg,
291 .accept = hash_accept,
292};
293
294static int hash_check_key(struct socket *sock)
295{
296 int err = 0;
297 struct sock *psk;
298 struct alg_sock *pask;
299 struct crypto_ahash *tfm;
300 struct sock *sk = sock->sk;
301 struct alg_sock *ask = alg_sk(sk);
302
303 lock_sock(sk);
304 if (ask->refcnt)
305 goto unlock_child;
306
307 psk = ask->parent;
308 pask = alg_sk(ask->parent);
309 tfm = pask->private;
310
311 err = -ENOKEY;
312 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
313 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
314 goto unlock;
315
316 if (!pask->refcnt++)
317 sock_hold(psk);
318
319 ask->refcnt = 1;
320 sock_put(psk);
321
322 err = 0;
323
324unlock:
325 release_sock(psk);
326unlock_child:
327 release_sock(sk);
328
329 return err;
330}
331
332static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
333 size_t size)
334{
335 int err;
336
337 err = hash_check_key(sock);
338 if (err)
339 return err;
340
341 return hash_sendmsg(sock, msg, size);
342}
343
344static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
345 int offset, size_t size, int flags)
346{
347 int err;
348
349 err = hash_check_key(sock);
350 if (err)
351 return err;
352
353 return hash_sendpage(sock, page, offset, size, flags);
354}
355
356static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
357 size_t ignored, int flags)
358{
359 int err;
360
361 err = hash_check_key(sock);
362 if (err)
363 return err;
364
365 return hash_recvmsg(sock, msg, ignored, flags);
366}
367
368static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
369 int flags, bool kern)
370{
371 int err;
372
373 err = hash_check_key(sock);
374 if (err)
375 return err;
376
377 return hash_accept(sock, newsock, flags, kern);
378}
379
380static struct proto_ops algif_hash_ops_nokey = {
381 .family = PF_ALG,
382
383 .connect = sock_no_connect,
384 .socketpair = sock_no_socketpair,
385 .getname = sock_no_getname,
386 .ioctl = sock_no_ioctl,
387 .listen = sock_no_listen,
388 .shutdown = sock_no_shutdown,
389 .getsockopt = sock_no_getsockopt,
390 .mmap = sock_no_mmap,
391 .bind = sock_no_bind,
392 .setsockopt = sock_no_setsockopt,
393
394 .release = af_alg_release,
395 .sendmsg = hash_sendmsg_nokey,
396 .sendpage = hash_sendpage_nokey,
397 .recvmsg = hash_recvmsg_nokey,
398 .accept = hash_accept_nokey,
399};
400
401static void *hash_bind(const char *name, u32 type, u32 mask)
402{
403 return crypto_alloc_ahash(name, type, mask);
404}
405
406static void hash_release(void *private)
407{
408 crypto_free_ahash(private);
409}
410
411static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
412{
413 return crypto_ahash_setkey(private, key, keylen);
414}
415
416static void hash_sock_destruct(struct sock *sk)
417{
418 struct alg_sock *ask = alg_sk(sk);
419 struct hash_ctx *ctx = ask->private;
420
421 hash_free_result(sk, ctx);
422 sock_kfree_s(sk, ctx, ctx->len);
423 af_alg_release_parent(sk);
424}
425
426static int hash_accept_parent_nokey(void *private, struct sock *sk)
427{
428 struct crypto_ahash *tfm = private;
429 struct alg_sock *ask = alg_sk(sk);
430 struct hash_ctx *ctx;
431 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
432
433 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
434 if (!ctx)
435 return -ENOMEM;
436
437 ctx->result = NULL;
438 ctx->len = len;
439 ctx->more = 0;
440 crypto_init_wait(&ctx->wait);
441
442 ask->private = ctx;
443
444 ahash_request_set_tfm(&ctx->req, tfm);
445 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
446 crypto_req_done, &ctx->wait);
447
448 sk->sk_destruct = hash_sock_destruct;
449
450 return 0;
451}
452
453static int hash_accept_parent(void *private, struct sock *sk)
454{
455 struct crypto_ahash *tfm = private;
456
457 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
458 return -ENOKEY;
459
460 return hash_accept_parent_nokey(private, sk);
461}
462
463static const struct af_alg_type algif_type_hash = {
464 .bind = hash_bind,
465 .release = hash_release,
466 .setkey = hash_setkey,
467 .accept = hash_accept_parent,
468 .accept_nokey = hash_accept_parent_nokey,
469 .ops = &algif_hash_ops,
470 .ops_nokey = &algif_hash_ops_nokey,
471 .name = "hash",
472 .owner = THIS_MODULE
473};
474
475static int __init algif_hash_init(void)
476{
477 return af_alg_register_type(&algif_type_hash);
478}
479
480static void __exit algif_hash_exit(void)
481{
482 int err = af_alg_unregister_type(&algif_type_hash);
483 BUG_ON(err);
484}
485
486module_init(algif_hash_init);
487module_exit(algif_hash_exit);
488MODULE_LICENSE("GPL");