blob: b4c24fe3dcfb5ed575350406c9dd7ece3c006aef [file] [log] [blame]
Herbert Xufe869cd2010-10-19 21:23:00 +08001/*
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
Ying Xue1b784142015-03-02 15:37:48 +080037static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
38 size_t ignored)
Herbert Xufe869cd2010-10-19 21:23:00 +080039{
40 int limit = ALG_MAX_PAGES * PAGE_SIZE;
41 struct sock *sk = sock->sk;
42 struct alg_sock *ask = alg_sk(sk);
43 struct hash_ctx *ctx = ask->private;
Herbert Xufe869cd2010-10-19 21:23:00 +080044 long copied = 0;
45 int err;
46
47 if (limit > sk->sk_sndbuf)
48 limit = sk->sk_sndbuf;
49
50 lock_sock(sk);
51 if (!ctx->more) {
52 err = crypto_ahash_init(&ctx->req);
53 if (err)
54 goto unlock;
55 }
56
57 ctx->more = 0;
58
Al Viro01e97e62014-12-15 21:39:31 -050059 while (msg_data_left(msg)) {
60 int len = msg_data_left(msg);
Herbert Xufe869cd2010-10-19 21:23:00 +080061
Al Viro1d10eb22014-11-28 16:39:25 -050062 if (len > limit)
63 len = limit;
Herbert Xufe869cd2010-10-19 21:23:00 +080064
Al Viro1d10eb22014-11-28 16:39:25 -050065 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
66 if (len < 0) {
67 err = copied ? 0 : len;
68 goto unlock;
Herbert Xufe869cd2010-10-19 21:23:00 +080069 }
Al Viro1d10eb22014-11-28 16:39:25 -050070
71 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
72
73 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
74 &ctx->completion);
75 af_alg_free_sg(&ctx->sgl);
76 if (err)
77 goto unlock;
78
79 copied += len;
80 iov_iter_advance(&msg->msg_iter, len);
Herbert Xufe869cd2010-10-19 21:23:00 +080081 }
82
83 err = 0;
84
85 ctx->more = msg->msg_flags & MSG_MORE;
86 if (!ctx->more) {
87 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
88 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
89 &ctx->completion);
90 }
91
92unlock:
93 release_sock(sk);
94
95 return err ?: copied;
96}
97
98static ssize_t hash_sendpage(struct socket *sock, struct page *page,
99 int offset, size_t size, int flags)
100{
101 struct sock *sk = sock->sk;
102 struct alg_sock *ask = alg_sk(sk);
103 struct hash_ctx *ctx = ask->private;
104 int err;
105
Shawn Landdend3f7d562013-11-24 22:36:28 -0800106 if (flags & MSG_SENDPAGE_NOTLAST)
107 flags |= MSG_MORE;
108
Herbert Xufe869cd2010-10-19 21:23:00 +0800109 lock_sock(sk);
110 sg_init_table(ctx->sgl.sg, 1);
111 sg_set_page(ctx->sgl.sg, page, size, offset);
112
113 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
114
115 if (!(flags & MSG_MORE)) {
116 if (ctx->more)
117 err = crypto_ahash_finup(&ctx->req);
118 else
119 err = crypto_ahash_digest(&ctx->req);
120 } else {
121 if (!ctx->more) {
122 err = crypto_ahash_init(&ctx->req);
123 if (err)
124 goto unlock;
125 }
126
127 err = crypto_ahash_update(&ctx->req);
128 }
129
130 err = af_alg_wait_for_completion(err, &ctx->completion);
131 if (err)
132 goto unlock;
133
134 ctx->more = flags & MSG_MORE;
135
136unlock:
137 release_sock(sk);
138
139 return err ?: size;
140}
141
Ying Xue1b784142015-03-02 15:37:48 +0800142static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
143 int flags)
Herbert Xufe869cd2010-10-19 21:23:00 +0800144{
145 struct sock *sk = sock->sk;
146 struct alg_sock *ask = alg_sk(sk);
147 struct hash_ctx *ctx = ask->private;
148 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
149 int err;
150
151 if (len > ds)
152 len = ds;
153 else if (len < ds)
154 msg->msg_flags |= MSG_TRUNC;
155
Herbert Xufe869cd2010-10-19 21:23:00 +0800156 lock_sock(sk);
157 if (ctx->more) {
158 ctx->more = 0;
159 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
160 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
161 &ctx->completion);
162 if (err)
163 goto unlock;
164 }
165
Al Viro7eab8d92014-04-06 21:51:23 -0400166 err = memcpy_to_msg(msg, ctx->result, len);
Herbert Xufe869cd2010-10-19 21:23:00 +0800167
168unlock:
169 release_sock(sk);
170
171 return err ?: len;
172}
173
174static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
175{
176 struct sock *sk = sock->sk;
177 struct alg_sock *ask = alg_sk(sk);
178 struct hash_ctx *ctx = ask->private;
179 struct ahash_request *req = &ctx->req;
180 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
181 struct sock *sk2;
182 struct alg_sock *ask2;
183 struct hash_ctx *ctx2;
Herbert Xu4afa5f92015-11-01 17:11:19 +0800184 bool more;
Herbert Xufe869cd2010-10-19 21:23:00 +0800185 int err;
186
Herbert Xu4afa5f92015-11-01 17:11:19 +0800187 lock_sock(sk);
188 more = ctx->more;
189 err = more ? crypto_ahash_export(req, state) : 0;
190 release_sock(sk);
191
Herbert Xufe869cd2010-10-19 21:23:00 +0800192 if (err)
193 return err;
194
195 err = af_alg_accept(ask->parent, newsock);
196 if (err)
197 return err;
198
199 sk2 = newsock->sk;
200 ask2 = alg_sk(sk2);
201 ctx2 = ask2->private;
Herbert Xu4afa5f92015-11-01 17:11:19 +0800202 ctx2->more = more;
203
204 if (!more)
205 return err;
Herbert Xufe869cd2010-10-19 21:23:00 +0800206
207 err = crypto_ahash_import(&ctx2->req, state);
208 if (err) {
209 sock_orphan(sk2);
210 sock_put(sk2);
211 }
212
213 return err;
214}
215
216static struct proto_ops algif_hash_ops = {
217 .family = PF_ALG,
218
219 .connect = sock_no_connect,
220 .socketpair = sock_no_socketpair,
221 .getname = sock_no_getname,
222 .ioctl = sock_no_ioctl,
223 .listen = sock_no_listen,
224 .shutdown = sock_no_shutdown,
225 .getsockopt = sock_no_getsockopt,
226 .mmap = sock_no_mmap,
227 .bind = sock_no_bind,
228 .setsockopt = sock_no_setsockopt,
229 .poll = sock_no_poll,
230
231 .release = af_alg_release,
232 .sendmsg = hash_sendmsg,
233 .sendpage = hash_sendpage,
234 .recvmsg = hash_recvmsg,
235 .accept = hash_accept,
236};
237
238static void *hash_bind(const char *name, u32 type, u32 mask)
239{
240 return crypto_alloc_ahash(name, type, mask);
241}
242
243static void hash_release(void *private)
244{
245 crypto_free_ahash(private);
246}
247
248static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
249{
250 return crypto_ahash_setkey(private, key, keylen);
251}
252
253static void hash_sock_destruct(struct sock *sk)
254{
255 struct alg_sock *ask = alg_sk(sk);
256 struct hash_ctx *ctx = ask->private;
257
Daniel Borkmann79e88652014-11-19 17:13:11 +0100258 sock_kzfree_s(sk, ctx->result,
259 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
Herbert Xufe869cd2010-10-19 21:23:00 +0800260 sock_kfree_s(sk, ctx, ctx->len);
261 af_alg_release_parent(sk);
262}
263
264static int hash_accept_parent(void *private, struct sock *sk)
265{
266 struct hash_ctx *ctx;
267 struct alg_sock *ask = alg_sk(sk);
268 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
269 unsigned ds = crypto_ahash_digestsize(private);
270
271 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
272 if (!ctx)
273 return -ENOMEM;
274
275 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
276 if (!ctx->result) {
277 sock_kfree_s(sk, ctx, len);
278 return -ENOMEM;
279 }
280
281 memset(ctx->result, 0, ds);
282
283 ctx->len = len;
284 ctx->more = 0;
285 af_alg_init_completion(&ctx->completion);
286
287 ask->private = ctx;
288
289 ahash_request_set_tfm(&ctx->req, private);
290 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
291 af_alg_complete, &ctx->completion);
292
293 sk->sk_destruct = hash_sock_destruct;
294
295 return 0;
296}
297
298static const struct af_alg_type algif_type_hash = {
299 .bind = hash_bind,
300 .release = hash_release,
301 .setkey = hash_setkey,
302 .accept = hash_accept_parent,
303 .ops = &algif_hash_ops,
304 .name = "hash",
305 .owner = THIS_MODULE
306};
307
308static int __init algif_hash_init(void)
309{
310 return af_alg_register_type(&algif_type_hash);
311}
312
313static void __exit algif_hash_exit(void)
314{
315 int err = af_alg_unregister_type(&algif_type_hash);
316 BUG_ON(err);
317}
318
319module_init(algif_hash_init);
320module_exit(algif_hash_exit);
321MODULE_LICENSE("GPL");