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