Loading...
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 struct sock *sk = sock->sk;
67 struct alg_sock *ask = alg_sk(sk);
68 struct hash_ctx *ctx = ask->private;
69 ssize_t copied = 0;
70 size_t len, max_pages, npages;
71 bool continuing, need_init = false;
72 int err;
73
74 max_pages = min_t(size_t, ALG_MAX_PAGES,
75 DIV_ROUND_UP(sk->sk_sndbuf, PAGE_SIZE));
76
77 lock_sock(sk);
78 continuing = ctx->more;
79
80 if (!continuing) {
81 /* Discard a previous request that wasn't marked MSG_MORE. */
82 hash_free_result(sk, ctx);
83 if (!msg_data_left(msg))
84 goto done; /* Zero-length; don't start new req */
85 need_init = true;
86 } else if (!msg_data_left(msg)) {
87 /*
88 * No data - finalise the prev req if MSG_MORE so any error
89 * comes out here.
90 */
91 if (!(msg->msg_flags & MSG_MORE)) {
92 err = hash_alloc_result(sk, ctx);
93 if (err)
94 goto unlock_free_result;
95 ahash_request_set_crypt(&ctx->req, NULL,
96 ctx->result, 0);
97 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
98 &ctx->wait);
99 if (err)
100 goto unlock_free_result;
101 }
102 goto done_more;
103 }
104
105 while (msg_data_left(msg)) {
106 ctx->sgl.sgt.sgl = ctx->sgl.sgl;
107 ctx->sgl.sgt.nents = 0;
108 ctx->sgl.sgt.orig_nents = 0;
109
110 err = -EIO;
111 npages = iov_iter_npages(&msg->msg_iter, max_pages);
112 if (npages == 0)
113 goto unlock_free;
114
115 sg_init_table(ctx->sgl.sgl, npages);
116
117 ctx->sgl.need_unpin = iov_iter_extract_will_pin(&msg->msg_iter);
118
119 err = extract_iter_to_sg(&msg->msg_iter, LONG_MAX,
120 &ctx->sgl.sgt, npages, 0);
121 if (err < 0)
122 goto unlock_free;
123 len = err;
124 sg_mark_end(ctx->sgl.sgt.sgl + ctx->sgl.sgt.nents - 1);
125
126 if (!msg_data_left(msg)) {
127 err = hash_alloc_result(sk, ctx);
128 if (err)
129 goto unlock_free;
130 }
131
132 ahash_request_set_crypt(&ctx->req, ctx->sgl.sgt.sgl,
133 ctx->result, len);
134
135 if (!msg_data_left(msg) && !continuing &&
136 !(msg->msg_flags & MSG_MORE)) {
137 err = crypto_ahash_digest(&ctx->req);
138 } else {
139 if (need_init) {
140 err = crypto_wait_req(
141 crypto_ahash_init(&ctx->req),
142 &ctx->wait);
143 if (err)
144 goto unlock_free;
145 need_init = false;
146 }
147
148 if (msg_data_left(msg) || (msg->msg_flags & MSG_MORE))
149 err = crypto_ahash_update(&ctx->req);
150 else
151 err = crypto_ahash_finup(&ctx->req);
152 continuing = true;
153 }
154
155 err = crypto_wait_req(err, &ctx->wait);
156 if (err)
157 goto unlock_free;
158
159 copied += len;
160 af_alg_free_sg(&ctx->sgl);
161 }
162
163done_more:
164 ctx->more = msg->msg_flags & MSG_MORE;
165done:
166 err = 0;
167unlock:
168 release_sock(sk);
169 return copied ?: err;
170
171unlock_free:
172 af_alg_free_sg(&ctx->sgl);
173unlock_free_result:
174 hash_free_result(sk, ctx);
175 ctx->more = false;
176 goto unlock;
177}
178
179static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
180 int flags)
181{
182 struct sock *sk = sock->sk;
183 struct alg_sock *ask = alg_sk(sk);
184 struct hash_ctx *ctx = ask->private;
185 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
186 bool result;
187 int err;
188
189 if (len > ds)
190 len = ds;
191 else if (len < ds)
192 msg->msg_flags |= MSG_TRUNC;
193
194 lock_sock(sk);
195 result = ctx->result;
196 err = hash_alloc_result(sk, ctx);
197 if (err)
198 goto unlock;
199
200 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
201
202 if (!result && !ctx->more) {
203 err = crypto_wait_req(crypto_ahash_init(&ctx->req),
204 &ctx->wait);
205 if (err)
206 goto unlock;
207 }
208
209 if (!result || ctx->more) {
210 ctx->more = false;
211 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
212 &ctx->wait);
213 if (err)
214 goto unlock;
215 }
216
217 err = memcpy_to_msg(msg, ctx->result, len);
218
219unlock:
220 hash_free_result(sk, ctx);
221 release_sock(sk);
222
223 return err ?: len;
224}
225
226static int hash_accept(struct socket *sock, struct socket *newsock,
227 struct proto_accept_arg *arg)
228{
229 struct sock *sk = sock->sk;
230 struct alg_sock *ask = alg_sk(sk);
231 struct hash_ctx *ctx = ask->private;
232 struct ahash_request *req = &ctx->req;
233 struct crypto_ahash *tfm;
234 struct sock *sk2;
235 struct alg_sock *ask2;
236 struct hash_ctx *ctx2;
237 char *state;
238 bool more;
239 int err;
240
241 tfm = crypto_ahash_reqtfm(req);
242 state = kmalloc(crypto_ahash_statesize(tfm), GFP_KERNEL);
243 err = -ENOMEM;
244 if (!state)
245 goto out;
246
247 lock_sock(sk);
248 more = ctx->more;
249 err = more ? crypto_ahash_export(req, state) : 0;
250 release_sock(sk);
251
252 if (err)
253 goto out_free_state;
254
255 err = af_alg_accept(ask->parent, newsock, arg);
256 if (err)
257 goto out_free_state;
258
259 sk2 = newsock->sk;
260 ask2 = alg_sk(sk2);
261 ctx2 = ask2->private;
262 ctx2->more = more;
263
264 if (!more)
265 goto out_free_state;
266
267 err = crypto_ahash_import(&ctx2->req, state);
268 if (err) {
269 sock_orphan(sk2);
270 sock_put(sk2);
271 }
272
273out_free_state:
274 kfree_sensitive(state);
275
276out:
277 return err;
278}
279
280static struct proto_ops algif_hash_ops = {
281 .family = PF_ALG,
282
283 .connect = sock_no_connect,
284 .socketpair = sock_no_socketpair,
285 .getname = sock_no_getname,
286 .ioctl = sock_no_ioctl,
287 .listen = sock_no_listen,
288 .shutdown = sock_no_shutdown,
289 .mmap = sock_no_mmap,
290 .bind = sock_no_bind,
291
292 .release = af_alg_release,
293 .sendmsg = hash_sendmsg,
294 .recvmsg = hash_recvmsg,
295 .accept = hash_accept,
296};
297
298static int hash_check_key(struct socket *sock)
299{
300 int err = 0;
301 struct sock *psk;
302 struct alg_sock *pask;
303 struct crypto_ahash *tfm;
304 struct sock *sk = sock->sk;
305 struct alg_sock *ask = alg_sk(sk);
306
307 lock_sock(sk);
308 if (!atomic_read(&ask->nokey_refcnt))
309 goto unlock_child;
310
311 psk = ask->parent;
312 pask = alg_sk(ask->parent);
313 tfm = pask->private;
314
315 err = -ENOKEY;
316 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
317 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
318 goto unlock;
319
320 atomic_dec(&pask->nokey_refcnt);
321 atomic_set(&ask->nokey_refcnt, 0);
322
323 err = 0;
324
325unlock:
326 release_sock(psk);
327unlock_child:
328 release_sock(sk);
329
330 return err;
331}
332
333static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
334 size_t size)
335{
336 int err;
337
338 err = hash_check_key(sock);
339 if (err)
340 return err;
341
342 return hash_sendmsg(sock, msg, size);
343}
344
345static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
346 size_t ignored, int flags)
347{
348 int err;
349
350 err = hash_check_key(sock);
351 if (err)
352 return err;
353
354 return hash_recvmsg(sock, msg, ignored, flags);
355}
356
357static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
358 struct proto_accept_arg *arg)
359{
360 int err;
361
362 err = hash_check_key(sock);
363 if (err)
364 return err;
365
366 return hash_accept(sock, newsock, arg);
367}
368
369static struct proto_ops algif_hash_ops_nokey = {
370 .family = PF_ALG,
371
372 .connect = sock_no_connect,
373 .socketpair = sock_no_socketpair,
374 .getname = sock_no_getname,
375 .ioctl = sock_no_ioctl,
376 .listen = sock_no_listen,
377 .shutdown = sock_no_shutdown,
378 .mmap = sock_no_mmap,
379 .bind = sock_no_bind,
380
381 .release = af_alg_release,
382 .sendmsg = hash_sendmsg_nokey,
383 .recvmsg = hash_recvmsg_nokey,
384 .accept = hash_accept_nokey,
385};
386
387static void *hash_bind(const char *name, u32 type, u32 mask)
388{
389 return crypto_alloc_ahash(name, type, mask);
390}
391
392static void hash_release(void *private)
393{
394 crypto_free_ahash(private);
395}
396
397static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
398{
399 return crypto_ahash_setkey(private, key, keylen);
400}
401
402static void hash_sock_destruct(struct sock *sk)
403{
404 struct alg_sock *ask = alg_sk(sk);
405 struct hash_ctx *ctx = ask->private;
406
407 hash_free_result(sk, ctx);
408 sock_kfree_s(sk, ctx, ctx->len);
409 af_alg_release_parent(sk);
410}
411
412static int hash_accept_parent_nokey(void *private, struct sock *sk)
413{
414 struct crypto_ahash *tfm = private;
415 struct alg_sock *ask = alg_sk(sk);
416 struct hash_ctx *ctx;
417 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
418
419 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
420 if (!ctx)
421 return -ENOMEM;
422
423 ctx->result = NULL;
424 ctx->len = len;
425 ctx->more = false;
426 crypto_init_wait(&ctx->wait);
427
428 ask->private = ctx;
429
430 ahash_request_set_tfm(&ctx->req, tfm);
431 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
432 crypto_req_done, &ctx->wait);
433
434 sk->sk_destruct = hash_sock_destruct;
435
436 return 0;
437}
438
439static int hash_accept_parent(void *private, struct sock *sk)
440{
441 struct crypto_ahash *tfm = private;
442
443 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
444 return -ENOKEY;
445
446 return hash_accept_parent_nokey(private, sk);
447}
448
449static const struct af_alg_type algif_type_hash = {
450 .bind = hash_bind,
451 .release = hash_release,
452 .setkey = hash_setkey,
453 .accept = hash_accept_parent,
454 .accept_nokey = hash_accept_parent_nokey,
455 .ops = &algif_hash_ops,
456 .ops_nokey = &algif_hash_ops_nokey,
457 .name = "hash",
458 .owner = THIS_MODULE
459};
460
461static int __init algif_hash_init(void)
462{
463 return af_alg_register_type(&algif_type_hash);
464}
465
466static void __exit algif_hash_exit(void)
467{
468 int err = af_alg_unregister_type(&algif_type_hash);
469 BUG_ON(err);
470}
471
472module_init(algif_hash_init);
473module_exit(algif_hash_exit);
474MODULE_DESCRIPTION("Userspace interface for hash algorithms");
475MODULE_LICENSE("GPL");