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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 | err = copied ? 0 : newlen; |
73 | goto unlock; |
74 | } |
75 | |
76 | ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, |
77 | newlen); |
78 | |
79 | err = af_alg_wait_for_completion( |
80 | crypto_ahash_update(&ctx->req), |
81 | &ctx->completion); |
82 | |
83 | af_alg_free_sg(&ctx->sgl); |
84 | |
85 | if (err) |
86 | goto unlock; |
87 | |
88 | seglen -= newlen; |
89 | from += newlen; |
90 | copied += newlen; |
91 | } |
92 | } |
93 | |
94 | err = 0; |
95 | |
96 | ctx->more = msg->msg_flags & MSG_MORE; |
97 | if (!ctx->more) { |
98 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
99 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
100 | &ctx->completion); |
101 | } |
102 | |
103 | unlock: |
104 | release_sock(sk); |
105 | |
106 | return err ?: copied; |
107 | } |
108 | |
109 | static ssize_t hash_sendpage(struct socket *sock, struct page *page, |
110 | int offset, size_t size, int flags) |
111 | { |
112 | struct sock *sk = sock->sk; |
113 | struct alg_sock *ask = alg_sk(sk); |
114 | struct hash_ctx *ctx = ask->private; |
115 | int err; |
116 | |
117 | lock_sock(sk); |
118 | sg_init_table(ctx->sgl.sg, 1); |
119 | sg_set_page(ctx->sgl.sg, page, size, offset); |
120 | |
121 | ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size); |
122 | |
123 | if (!(flags & MSG_MORE)) { |
124 | if (ctx->more) |
125 | err = crypto_ahash_finup(&ctx->req); |
126 | else |
127 | err = crypto_ahash_digest(&ctx->req); |
128 | } else { |
129 | if (!ctx->more) { |
130 | err = crypto_ahash_init(&ctx->req); |
131 | if (err) |
132 | goto unlock; |
133 | } |
134 | |
135 | err = crypto_ahash_update(&ctx->req); |
136 | } |
137 | |
138 | err = af_alg_wait_for_completion(err, &ctx->completion); |
139 | if (err) |
140 | goto unlock; |
141 | |
142 | ctx->more = flags & MSG_MORE; |
143 | |
144 | unlock: |
145 | release_sock(sk); |
146 | |
147 | return err ?: size; |
148 | } |
149 | |
150 | static int hash_recvmsg(struct kiocb *unused, struct socket *sock, |
151 | struct msghdr *msg, size_t len, int flags) |
152 | { |
153 | struct sock *sk = sock->sk; |
154 | struct alg_sock *ask = alg_sk(sk); |
155 | struct hash_ctx *ctx = ask->private; |
156 | unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)); |
157 | int err; |
158 | |
159 | if (len > ds) |
160 | len = ds; |
161 | else if (len < ds) |
162 | msg->msg_flags |= MSG_TRUNC; |
163 | |
164 | msg->msg_namelen = 0; |
165 | |
166 | lock_sock(sk); |
167 | if (ctx->more) { |
168 | ctx->more = 0; |
169 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
170 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
171 | &ctx->completion); |
172 | if (err) |
173 | goto unlock; |
174 | } |
175 | |
176 | err = memcpy_toiovec(msg->msg_iov, ctx->result, len); |
177 | |
178 | unlock: |
179 | release_sock(sk); |
180 | |
181 | return err ?: len; |
182 | } |
183 | |
184 | static int hash_accept(struct socket *sock, struct socket *newsock, int flags) |
185 | { |
186 | struct sock *sk = sock->sk; |
187 | struct alg_sock *ask = alg_sk(sk); |
188 | struct hash_ctx *ctx = ask->private; |
189 | struct ahash_request *req = &ctx->req; |
190 | char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))]; |
191 | struct sock *sk2; |
192 | struct alg_sock *ask2; |
193 | struct hash_ctx *ctx2; |
194 | int err; |
195 | |
196 | err = crypto_ahash_export(req, state); |
197 | if (err) |
198 | return err; |
199 | |
200 | err = af_alg_accept(ask->parent, newsock); |
201 | if (err) |
202 | return err; |
203 | |
204 | sk2 = newsock->sk; |
205 | ask2 = alg_sk(sk2); |
206 | ctx2 = ask2->private; |
207 | ctx2->more = 1; |
208 | |
209 | err = crypto_ahash_import(&ctx2->req, state); |
210 | if (err) { |
211 | sock_orphan(sk2); |
212 | sock_put(sk2); |
213 | } |
214 | |
215 | return err; |
216 | } |
217 | |
218 | static struct proto_ops algif_hash_ops = { |
219 | .family = PF_ALG, |
220 | |
221 | .connect = sock_no_connect, |
222 | .socketpair = sock_no_socketpair, |
223 | .getname = sock_no_getname, |
224 | .ioctl = sock_no_ioctl, |
225 | .listen = sock_no_listen, |
226 | .shutdown = sock_no_shutdown, |
227 | .getsockopt = sock_no_getsockopt, |
228 | .mmap = sock_no_mmap, |
229 | .bind = sock_no_bind, |
230 | .setsockopt = sock_no_setsockopt, |
231 | .poll = sock_no_poll, |
232 | |
233 | .release = af_alg_release, |
234 | .sendmsg = hash_sendmsg, |
235 | .sendpage = hash_sendpage, |
236 | .recvmsg = hash_recvmsg, |
237 | .accept = hash_accept, |
238 | }; |
239 | |
240 | static void *hash_bind(const char *name, u32 type, u32 mask) |
241 | { |
242 | return crypto_alloc_ahash(name, type, mask); |
243 | } |
244 | |
245 | static void hash_release(void *private) |
246 | { |
247 | crypto_free_ahash(private); |
248 | } |
249 | |
250 | static int hash_setkey(void *private, const u8 *key, unsigned int keylen) |
251 | { |
252 | return crypto_ahash_setkey(private, key, keylen); |
253 | } |
254 | |
255 | static void hash_sock_destruct(struct sock *sk) |
256 | { |
257 | struct alg_sock *ask = alg_sk(sk); |
258 | struct hash_ctx *ctx = ask->private; |
259 | |
260 | sock_kfree_s(sk, ctx->result, |
261 | crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req))); |
262 | sock_kfree_s(sk, ctx, ctx->len); |
263 | af_alg_release_parent(sk); |
264 | } |
265 | |
266 | static int hash_accept_parent(void *private, struct sock *sk) |
267 | { |
268 | struct hash_ctx *ctx; |
269 | struct alg_sock *ask = alg_sk(sk); |
270 | unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private); |
271 | unsigned ds = crypto_ahash_digestsize(private); |
272 | |
273 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); |
274 | if (!ctx) |
275 | return -ENOMEM; |
276 | |
277 | ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL); |
278 | if (!ctx->result) { |
279 | sock_kfree_s(sk, ctx, len); |
280 | return -ENOMEM; |
281 | } |
282 | |
283 | memset(ctx->result, 0, ds); |
284 | |
285 | ctx->len = len; |
286 | ctx->more = 0; |
287 | af_alg_init_completion(&ctx->completion); |
288 | |
289 | ask->private = ctx; |
290 | |
291 | ahash_request_set_tfm(&ctx->req, private); |
292 | ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
293 | af_alg_complete, &ctx->completion); |
294 | |
295 | sk->sk_destruct = hash_sock_destruct; |
296 | |
297 | return 0; |
298 | } |
299 | |
300 | static const struct af_alg_type algif_type_hash = { |
301 | .bind = hash_bind, |
302 | .release = hash_release, |
303 | .setkey = hash_setkey, |
304 | .accept = hash_accept_parent, |
305 | .ops = &algif_hash_ops, |
306 | .name = "hash", |
307 | .owner = THIS_MODULE |
308 | }; |
309 | |
310 | static int __init algif_hash_init(void) |
311 | { |
312 | return af_alg_register_type(&algif_type_hash); |
313 | } |
314 | |
315 | static void __exit algif_hash_exit(void) |
316 | { |
317 | int err = af_alg_unregister_type(&algif_type_hash); |
318 | BUG_ON(err); |
319 | } |
320 | |
321 | module_init(algif_hash_init); |
322 | module_exit(algif_hash_exit); |
323 | MODULE_LICENSE("GPL"); |
324 |
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