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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 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");
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_alloc_result(struct sock *sk, struct hash_ctx *ctx)
43{
44 unsigned ds;
45
46 if (ctx->result)
47 return 0;
48
49 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
50
51 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
52 if (!ctx->result)
53 return -ENOMEM;
54
55 memset(ctx->result, 0, ds);
56
57 return 0;
58}
59
60static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
61{
62 unsigned ds;
63
64 if (!ctx->result)
65 return;
66
67 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
68
69 sock_kzfree_s(sk, ctx->result, ds);
70 ctx->result = NULL;
71}
72
73static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
74 size_t ignored)
75{
76 int limit = ALG_MAX_PAGES * PAGE_SIZE;
77 struct sock *sk = sock->sk;
78 struct alg_sock *ask = alg_sk(sk);
79 struct hash_ctx *ctx = ask->private;
80 long copied = 0;
81 int err;
82
83 if (limit > sk->sk_sndbuf)
84 limit = sk->sk_sndbuf;
85
86 lock_sock(sk);
87 if (!ctx->more) {
88 if ((msg->msg_flags & MSG_MORE))
89 hash_free_result(sk, ctx);
90
91 err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
92 &ctx->completion);
93 if (err)
94 goto unlock;
95 }
96
97 ctx->more = 0;
98
99 while (msg_data_left(msg)) {
100 int len = msg_data_left(msg);
101
102 if (len > limit)
103 len = limit;
104
105 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
106 if (len < 0) {
107 err = copied ? 0 : len;
108 goto unlock;
109 }
110
111 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
112
113 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
114 &ctx->completion);
115 af_alg_free_sg(&ctx->sgl);
116 if (err)
117 goto unlock;
118
119 copied += len;
120 iov_iter_advance(&msg->msg_iter, len);
121 }
122
123 err = 0;
124
125 ctx->more = msg->msg_flags & MSG_MORE;
126 if (!ctx->more) {
127 err = hash_alloc_result(sk, ctx);
128 if (err)
129 goto unlock;
130
131 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
132 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
133 &ctx->completion);
134 }
135
136unlock:
137 release_sock(sk);
138
139 return err ?: copied;
140}
141
142static ssize_t hash_sendpage(struct socket *sock, struct page *page,
143 int offset, size_t size, int flags)
144{
145 struct sock *sk = sock->sk;
146 struct alg_sock *ask = alg_sk(sk);
147 struct hash_ctx *ctx = ask->private;
148 int err;
149
150 if (flags & MSG_SENDPAGE_NOTLAST)
151 flags |= MSG_MORE;
152
153 lock_sock(sk);
154 sg_init_table(ctx->sgl.sg, 1);
155 sg_set_page(ctx->sgl.sg, page, size, offset);
156
157 if (!(flags & MSG_MORE)) {
158 err = hash_alloc_result(sk, ctx);
159 if (err)
160 goto unlock;
161 } else if (!ctx->more)
162 hash_free_result(sk, ctx);
163
164 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
165
166 if (!(flags & MSG_MORE)) {
167 if (ctx->more)
168 err = crypto_ahash_finup(&ctx->req);
169 else
170 err = crypto_ahash_digest(&ctx->req);
171 } else {
172 if (!ctx->more) {
173 err = crypto_ahash_init(&ctx->req);
174 err = af_alg_wait_for_completion(err, &ctx->completion);
175 if (err)
176 goto unlock;
177 }
178
179 err = crypto_ahash_update(&ctx->req);
180 }
181
182 err = af_alg_wait_for_completion(err, &ctx->completion);
183 if (err)
184 goto unlock;
185
186 ctx->more = flags & MSG_MORE;
187
188unlock:
189 release_sock(sk);
190
191 return err ?: size;
192}
193
194static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
195 int flags)
196{
197 struct sock *sk = sock->sk;
198 struct alg_sock *ask = alg_sk(sk);
199 struct hash_ctx *ctx = ask->private;
200 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
201 bool result;
202 int err;
203
204 if (len > ds)
205 len = ds;
206 else if (len < ds)
207 msg->msg_flags |= MSG_TRUNC;
208
209 lock_sock(sk);
210 result = ctx->result;
211 err = hash_alloc_result(sk, ctx);
212 if (err)
213 goto unlock;
214
215 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
216
217 if (!result && !ctx->more) {
218 err = af_alg_wait_for_completion(
219 crypto_ahash_init(&ctx->req),
220 &ctx->completion);
221 if (err)
222 goto unlock;
223 }
224
225 if (!result || ctx->more) {
226 ctx->more = 0;
227 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
228 &ctx->completion);
229 if (err)
230 goto unlock;
231 }
232
233 err = memcpy_to_msg(msg, ctx->result, len);
234
235unlock:
236 hash_free_result(sk, ctx);
237 release_sock(sk);
238
239 return err ?: len;
240}
241
242static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
243{
244 struct sock *sk = sock->sk;
245 struct alg_sock *ask = alg_sk(sk);
246 struct hash_ctx *ctx = ask->private;
247 struct ahash_request *req = &ctx->req;
248 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
249 struct sock *sk2;
250 struct alg_sock *ask2;
251 struct hash_ctx *ctx2;
252 bool more;
253 int err;
254
255 lock_sock(sk);
256 more = ctx->more;
257 err = more ? crypto_ahash_export(req, state) : 0;
258 release_sock(sk);
259
260 if (err)
261 return err;
262
263 err = af_alg_accept(ask->parent, newsock);
264 if (err)
265 return err;
266
267 sk2 = newsock->sk;
268 ask2 = alg_sk(sk2);
269 ctx2 = ask2->private;
270 ctx2->more = more;
271
272 if (!more)
273 return err;
274
275 err = crypto_ahash_import(&ctx2->req, state);
276 if (err) {
277 sock_orphan(sk2);
278 sock_put(sk2);
279 }
280
281 return err;
282}
283
284static struct proto_ops algif_hash_ops = {
285 .family = PF_ALG,
286
287 .connect = sock_no_connect,
288 .socketpair = sock_no_socketpair,
289 .getname = sock_no_getname,
290 .ioctl = sock_no_ioctl,
291 .listen = sock_no_listen,
292 .shutdown = sock_no_shutdown,
293 .getsockopt = sock_no_getsockopt,
294 .mmap = sock_no_mmap,
295 .bind = sock_no_bind,
296 .setsockopt = sock_no_setsockopt,
297 .poll = sock_no_poll,
298
299 .release = af_alg_release,
300 .sendmsg = hash_sendmsg,
301 .sendpage = hash_sendpage,
302 .recvmsg = hash_recvmsg,
303 .accept = hash_accept,
304};
305
306static int hash_check_key(struct socket *sock)
307{
308 int err = 0;
309 struct sock *psk;
310 struct alg_sock *pask;
311 struct algif_hash_tfm *tfm;
312 struct sock *sk = sock->sk;
313 struct alg_sock *ask = alg_sk(sk);
314
315 lock_sock(sk);
316 if (ask->refcnt)
317 goto unlock_child;
318
319 psk = ask->parent;
320 pask = alg_sk(ask->parent);
321 tfm = pask->private;
322
323 err = -ENOKEY;
324 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
325 if (!tfm->has_key)
326 goto unlock;
327
328 if (!pask->refcnt++)
329 sock_hold(psk);
330
331 ask->refcnt = 1;
332 sock_put(psk);
333
334 err = 0;
335
336unlock:
337 release_sock(psk);
338unlock_child:
339 release_sock(sk);
340
341 return err;
342}
343
344static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
345 size_t size)
346{
347 int err;
348
349 err = hash_check_key(sock);
350 if (err)
351 return err;
352
353 return hash_sendmsg(sock, msg, size);
354}
355
356static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
357 int offset, size_t size, int flags)
358{
359 int err;
360
361 err = hash_check_key(sock);
362 if (err)
363 return err;
364
365 return hash_sendpage(sock, page, offset, size, flags);
366}
367
368static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
369 size_t ignored, int flags)
370{
371 int err;
372
373 err = hash_check_key(sock);
374 if (err)
375 return err;
376
377 return hash_recvmsg(sock, msg, ignored, flags);
378}
379
380static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
381 int flags)
382{
383 int err;
384
385 err = hash_check_key(sock);
386 if (err)
387 return err;
388
389 return hash_accept(sock, newsock, flags);
390}
391
392static struct proto_ops algif_hash_ops_nokey = {
393 .family = PF_ALG,
394
395 .connect = sock_no_connect,
396 .socketpair = sock_no_socketpair,
397 .getname = sock_no_getname,
398 .ioctl = sock_no_ioctl,
399 .listen = sock_no_listen,
400 .shutdown = sock_no_shutdown,
401 .getsockopt = sock_no_getsockopt,
402 .mmap = sock_no_mmap,
403 .bind = sock_no_bind,
404 .setsockopt = sock_no_setsockopt,
405 .poll = sock_no_poll,
406
407 .release = af_alg_release,
408 .sendmsg = hash_sendmsg_nokey,
409 .sendpage = hash_sendpage_nokey,
410 .recvmsg = hash_recvmsg_nokey,
411 .accept = hash_accept_nokey,
412};
413
414static void *hash_bind(const char *name, u32 type, u32 mask)
415{
416 struct algif_hash_tfm *tfm;
417 struct crypto_ahash *hash;
418
419 tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
420 if (!tfm)
421 return ERR_PTR(-ENOMEM);
422
423 hash = crypto_alloc_ahash(name, type, mask);
424 if (IS_ERR(hash)) {
425 kfree(tfm);
426 return ERR_CAST(hash);
427 }
428
429 tfm->hash = hash;
430
431 return tfm;
432}
433
434static void hash_release(void *private)
435{
436 struct algif_hash_tfm *tfm = private;
437
438 crypto_free_ahash(tfm->hash);
439 kfree(tfm);
440}
441
442static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
443{
444 struct algif_hash_tfm *tfm = private;
445 int err;
446
447 err = crypto_ahash_setkey(tfm->hash, key, keylen);
448 tfm->has_key = !err;
449
450 return err;
451}
452
453static void hash_sock_destruct(struct sock *sk)
454{
455 struct alg_sock *ask = alg_sk(sk);
456 struct hash_ctx *ctx = ask->private;
457
458 hash_free_result(sk, ctx);
459 sock_kfree_s(sk, ctx, ctx->len);
460 af_alg_release_parent(sk);
461}
462
463static int hash_accept_parent_nokey(void *private, struct sock *sk)
464{
465 struct hash_ctx *ctx;
466 struct alg_sock *ask = alg_sk(sk);
467 struct algif_hash_tfm *tfm = private;
468 struct crypto_ahash *hash = tfm->hash;
469 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
470
471 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
472 if (!ctx)
473 return -ENOMEM;
474
475 ctx->result = NULL;
476 ctx->len = len;
477 ctx->more = 0;
478 af_alg_init_completion(&ctx->completion);
479
480 ask->private = ctx;
481
482 ahash_request_set_tfm(&ctx->req, hash);
483 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
484 af_alg_complete, &ctx->completion);
485
486 sk->sk_destruct = hash_sock_destruct;
487
488 return 0;
489}
490
491static int hash_accept_parent(void *private, struct sock *sk)
492{
493 struct algif_hash_tfm *tfm = private;
494
495 if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
496 return -ENOKEY;
497
498 return hash_accept_parent_nokey(private, sk);
499}
500
501static const struct af_alg_type algif_type_hash = {
502 .bind = hash_bind,
503 .release = hash_release,
504 .setkey = hash_setkey,
505 .accept = hash_accept_parent,
506 .accept_nokey = hash_accept_parent_nokey,
507 .ops = &algif_hash_ops,
508 .ops_nokey = &algif_hash_ops_nokey,
509 .name = "hash",
510 .owner = THIS_MODULE
511};
512
513static int __init algif_hash_init(void)
514{
515 return af_alg_register_type(&algif_type_hash);
516}
517
518static void __exit algif_hash_exit(void)
519{
520 int err = af_alg_unregister_type(&algif_type_hash);
521 BUG_ON(err);
522}
523
524module_init(algif_hash_init);
525module_exit(algif_hash_exit);
526MODULE_LICENSE("GPL");