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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 | |
24 | struct 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 | |
37 | static int hash_sendmsg(struct kiocb *unused, struct socket *sock, |
38 | struct msghdr *msg, size_t ignored) |
39 | { |
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; |
44 | unsigned long iovlen; |
45 | struct iovec *iov; |
46 | long copied = 0; |
47 | int err; |
48 | |
49 | if (limit > sk->sk_sndbuf) |
50 | limit = sk->sk_sndbuf; |
51 | |
52 | lock_sock(sk); |
53 | if (!ctx->more) { |
54 | err = crypto_ahash_init(&ctx->req); |
55 | if (err) |
56 | goto unlock; |
57 | } |
58 | |
59 | ctx->more = 0; |
60 | |
61 | for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0; |
62 | iovlen--, iov++) { |
63 | unsigned long seglen = iov->iov_len; |
64 | char __user *from = iov->iov_base; |
65 | |
66 | while (seglen) { |
67 | int len = min_t(unsigned long, seglen, limit); |
68 | int newlen; |
69 | |
70 | newlen = af_alg_make_sg(&ctx->sgl, from, len, 0); |
71 | if (newlen < 0) |
72 | goto unlock; |
73 | |
74 | ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, |
75 | newlen); |
76 | |
77 | err = af_alg_wait_for_completion( |
78 | crypto_ahash_update(&ctx->req), |
79 | &ctx->completion); |
80 | |
81 | af_alg_free_sg(&ctx->sgl); |
82 | |
83 | if (err) |
84 | goto unlock; |
85 | |
86 | seglen -= newlen; |
87 | from += newlen; |
88 | copied += newlen; |
89 | } |
90 | } |
91 | |
92 | err = 0; |
93 | |
94 | ctx->more = msg->msg_flags & MSG_MORE; |
95 | if (!ctx->more) { |
96 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
97 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
98 | &ctx->completion); |
99 | } |
100 | |
101 | unlock: |
102 | release_sock(sk); |
103 | |
104 | return err ?: copied; |
105 | } |
106 | |
107 | static ssize_t hash_sendpage(struct socket *sock, struct page *page, |
108 | int offset, size_t size, int flags) |
109 | { |
110 | struct sock *sk = sock->sk; |
111 | struct alg_sock *ask = alg_sk(sk); |
112 | struct hash_ctx *ctx = ask->private; |
113 | int err; |
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 | if (err) |
130 | goto unlock; |
131 | } |
132 | |
133 | err = crypto_ahash_update(&ctx->req); |
134 | } |
135 | |
136 | err = af_alg_wait_for_completion(err, &ctx->completion); |
137 | if (err) |
138 | goto unlock; |
139 | |
140 | ctx->more = flags & MSG_MORE; |
141 | |
142 | unlock: |
143 | release_sock(sk); |
144 | |
145 | return err ?: size; |
146 | } |
147 | |
148 | static int hash_recvmsg(struct kiocb *unused, struct socket *sock, |
149 | struct msghdr *msg, size_t len, int flags) |
150 | { |
151 | struct sock *sk = sock->sk; |
152 | struct alg_sock *ask = alg_sk(sk); |
153 | struct hash_ctx *ctx = ask->private; |
154 | unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)); |
155 | int err; |
156 | |
157 | if (len > ds) |
158 | len = ds; |
159 | else if (len < ds) |
160 | msg->msg_flags |= MSG_TRUNC; |
161 | |
162 | lock_sock(sk); |
163 | if (ctx->more) { |
164 | ctx->more = 0; |
165 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
166 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
167 | &ctx->completion); |
168 | if (err) |
169 | goto unlock; |
170 | } |
171 | |
172 | err = memcpy_toiovec(msg->msg_iov, ctx->result, len); |
173 | |
174 | unlock: |
175 | release_sock(sk); |
176 | |
177 | return err ?: len; |
178 | } |
179 | |
180 | static int hash_accept(struct socket *sock, struct socket *newsock, 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 | struct ahash_request *req = &ctx->req; |
186 | char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))]; |
187 | struct sock *sk2; |
188 | struct alg_sock *ask2; |
189 | struct hash_ctx *ctx2; |
190 | int err; |
191 | |
192 | err = crypto_ahash_export(req, state); |
193 | if (err) |
194 | return err; |
195 | |
196 | err = af_alg_accept(ask->parent, newsock); |
197 | if (err) |
198 | return err; |
199 | |
200 | sk2 = newsock->sk; |
201 | ask2 = alg_sk(sk2); |
202 | ctx2 = ask2->private; |
203 | ctx2->more = 1; |
204 | |
205 | err = crypto_ahash_import(&ctx2->req, state); |
206 | if (err) { |
207 | sock_orphan(sk2); |
208 | sock_put(sk2); |
209 | } |
210 | |
211 | return err; |
212 | } |
213 | |
214 | static struct proto_ops algif_hash_ops = { |
215 | .family = PF_ALG, |
216 | |
217 | .connect = sock_no_connect, |
218 | .socketpair = sock_no_socketpair, |
219 | .getname = sock_no_getname, |
220 | .ioctl = sock_no_ioctl, |
221 | .listen = sock_no_listen, |
222 | .shutdown = sock_no_shutdown, |
223 | .getsockopt = sock_no_getsockopt, |
224 | .mmap = sock_no_mmap, |
225 | .bind = sock_no_bind, |
226 | .setsockopt = sock_no_setsockopt, |
227 | .poll = sock_no_poll, |
228 | |
229 | .release = af_alg_release, |
230 | .sendmsg = hash_sendmsg, |
231 | .sendpage = hash_sendpage, |
232 | .recvmsg = hash_recvmsg, |
233 | .accept = hash_accept, |
234 | }; |
235 | |
236 | static void *hash_bind(const char *name, u32 type, u32 mask) |
237 | { |
238 | return crypto_alloc_ahash(name, type, mask); |
239 | } |
240 | |
241 | static void hash_release(void *private) |
242 | { |
243 | crypto_free_ahash(private); |
244 | } |
245 | |
246 | static int hash_setkey(void *private, const u8 *key, unsigned int keylen) |
247 | { |
248 | return crypto_ahash_setkey(private, key, keylen); |
249 | } |
250 | |
251 | static void hash_sock_destruct(struct sock *sk) |
252 | { |
253 | struct alg_sock *ask = alg_sk(sk); |
254 | struct hash_ctx *ctx = ask->private; |
255 | |
256 | sock_kfree_s(sk, ctx->result, |
257 | crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req))); |
258 | sock_kfree_s(sk, ctx, ctx->len); |
259 | af_alg_release_parent(sk); |
260 | } |
261 | |
262 | static int hash_accept_parent(void *private, struct sock *sk) |
263 | { |
264 | struct hash_ctx *ctx; |
265 | struct alg_sock *ask = alg_sk(sk); |
266 | unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private); |
267 | unsigned ds = crypto_ahash_digestsize(private); |
268 | |
269 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); |
270 | if (!ctx) |
271 | return -ENOMEM; |
272 | |
273 | ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL); |
274 | if (!ctx->result) { |
275 | sock_kfree_s(sk, ctx, len); |
276 | return -ENOMEM; |
277 | } |
278 | |
279 | memset(ctx->result, 0, ds); |
280 | |
281 | ctx->len = len; |
282 | ctx->more = 0; |
283 | af_alg_init_completion(&ctx->completion); |
284 | |
285 | ask->private = ctx; |
286 | |
287 | ahash_request_set_tfm(&ctx->req, private); |
288 | ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
289 | af_alg_complete, &ctx->completion); |
290 | |
291 | sk->sk_destruct = hash_sock_destruct; |
292 | |
293 | return 0; |
294 | } |
295 | |
296 | static const struct af_alg_type algif_type_hash = { |
297 | .bind = hash_bind, |
298 | .release = hash_release, |
299 | .setkey = hash_setkey, |
300 | .accept = hash_accept_parent, |
301 | .ops = &algif_hash_ops, |
302 | .name = "hash", |
303 | .owner = THIS_MODULE |
304 | }; |
305 | |
306 | static int __init algif_hash_init(void) |
307 | { |
308 | return af_alg_register_type(&algif_type_hash); |
309 | } |
310 | |
311 | static void __exit algif_hash_exit(void) |
312 | { |
313 | int err = af_alg_unregister_type(&algif_type_hash); |
314 | BUG_ON(err); |
315 | } |
316 | |
317 | module_init(algif_hash_init); |
318 | module_exit(algif_hash_exit); |
319 | MODULE_LICENSE("GPL"); |
320 |
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