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1/*
2 * algif_skcipher: User-space interface for skcipher algorithms
3 *
4 * This file provides the user-space API for symmetric key ciphers.
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 * The following concept of the memory management is used:
14 *
15 * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
16 * filled by user space with the data submitted via sendpage/sendmsg. Filling
17 * up the TX SGL does not cause a crypto operation -- the data will only be
18 * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
19 * provide a buffer which is tracked with the RX SGL.
20 *
21 * During the processing of the recvmsg operation, the cipher request is
22 * allocated and prepared. As part of the recvmsg operation, the processed
23 * TX buffers are extracted from the TX SGL into a separate SGL.
24 *
25 * After the completion of the crypto operation, the RX SGL and the cipher
26 * request is released. The extracted TX SGL parts are released together with
27 * the RX SGL release.
28 */
29
30#include <crypto/scatterwalk.h>
31#include <crypto/skcipher.h>
32#include <crypto/if_alg.h>
33#include <linux/init.h>
34#include <linux/list.h>
35#include <linux/kernel.h>
36#include <linux/mm.h>
37#include <linux/module.h>
38#include <linux/net.h>
39#include <net/sock.h>
40
41static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
42 size_t size)
43{
44 struct sock *sk = sock->sk;
45 struct alg_sock *ask = alg_sk(sk);
46 struct sock *psk = ask->parent;
47 struct alg_sock *pask = alg_sk(psk);
48 struct crypto_skcipher *tfm = pask->private;
49 unsigned ivsize = crypto_skcipher_ivsize(tfm);
50
51 return af_alg_sendmsg(sock, msg, size, ivsize);
52}
53
54static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
55 size_t ignored, int flags)
56{
57 struct sock *sk = sock->sk;
58 struct alg_sock *ask = alg_sk(sk);
59 struct sock *psk = ask->parent;
60 struct alg_sock *pask = alg_sk(psk);
61 struct af_alg_ctx *ctx = ask->private;
62 struct crypto_skcipher *tfm = pask->private;
63 unsigned int bs = crypto_skcipher_blocksize(tfm);
64 struct af_alg_async_req *areq;
65 int err = 0;
66 size_t len = 0;
67
68 if (!ctx->used) {
69 err = af_alg_wait_for_data(sk, flags);
70 if (err)
71 return err;
72 }
73
74 /* Allocate cipher request for current operation. */
75 areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
76 crypto_skcipher_reqsize(tfm));
77 if (IS_ERR(areq))
78 return PTR_ERR(areq);
79
80 /* convert iovecs of output buffers into RX SGL */
81 err = af_alg_get_rsgl(sk, msg, flags, areq, -1, &len);
82 if (err)
83 goto free;
84
85 /* Process only as much RX buffers for which we have TX data */
86 if (len > ctx->used)
87 len = ctx->used;
88
89 /*
90 * If more buffers are to be expected to be processed, process only
91 * full block size buffers.
92 */
93 if (ctx->more || len < ctx->used)
94 len -= len % bs;
95
96 /*
97 * Create a per request TX SGL for this request which tracks the
98 * SG entries from the global TX SGL.
99 */
100 areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0);
101 if (!areq->tsgl_entries)
102 areq->tsgl_entries = 1;
103 areq->tsgl = sock_kmalloc(sk, sizeof(*areq->tsgl) * areq->tsgl_entries,
104 GFP_KERNEL);
105 if (!areq->tsgl) {
106 err = -ENOMEM;
107 goto free;
108 }
109 sg_init_table(areq->tsgl, areq->tsgl_entries);
110 af_alg_pull_tsgl(sk, len, areq->tsgl, 0);
111
112 /* Initialize the crypto operation */
113 skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
114 skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
115 areq->first_rsgl.sgl.sg, len, ctx->iv);
116
117 if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
118 /* AIO operation */
119 sock_hold(sk);
120 areq->iocb = msg->msg_iocb;
121
122 /* Remember output size that will be generated. */
123 areq->outlen = len;
124
125 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
126 CRYPTO_TFM_REQ_MAY_SLEEP,
127 af_alg_async_cb, areq);
128 err = ctx->enc ?
129 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
130 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
131
132 /* AIO operation in progress */
133 if (err == -EINPROGRESS || err == -EBUSY)
134 return -EIOCBQUEUED;
135
136 sock_put(sk);
137 } else {
138 /* Synchronous operation */
139 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
140 CRYPTO_TFM_REQ_MAY_SLEEP |
141 CRYPTO_TFM_REQ_MAY_BACKLOG,
142 crypto_req_done, &ctx->wait);
143 err = crypto_wait_req(ctx->enc ?
144 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
145 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req),
146 &ctx->wait);
147 }
148
149
150free:
151 af_alg_free_resources(areq);
152
153 return err ? err : len;
154}
155
156static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
157 size_t ignored, int flags)
158{
159 struct sock *sk = sock->sk;
160 int ret = 0;
161
162 lock_sock(sk);
163 while (msg_data_left(msg)) {
164 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
165
166 /*
167 * This error covers -EIOCBQUEUED which implies that we can
168 * only handle one AIO request. If the caller wants to have
169 * multiple AIO requests in parallel, he must make multiple
170 * separate AIO calls.
171 *
172 * Also return the error if no data has been processed so far.
173 */
174 if (err <= 0) {
175 if (err == -EIOCBQUEUED || !ret)
176 ret = err;
177 goto out;
178 }
179
180 ret += err;
181 }
182
183out:
184 af_alg_wmem_wakeup(sk);
185 release_sock(sk);
186 return ret;
187}
188
189static struct proto_ops algif_skcipher_ops = {
190 .family = PF_ALG,
191
192 .connect = sock_no_connect,
193 .socketpair = sock_no_socketpair,
194 .getname = sock_no_getname,
195 .ioctl = sock_no_ioctl,
196 .listen = sock_no_listen,
197 .shutdown = sock_no_shutdown,
198 .getsockopt = sock_no_getsockopt,
199 .mmap = sock_no_mmap,
200 .bind = sock_no_bind,
201 .accept = sock_no_accept,
202 .setsockopt = sock_no_setsockopt,
203
204 .release = af_alg_release,
205 .sendmsg = skcipher_sendmsg,
206 .sendpage = af_alg_sendpage,
207 .recvmsg = skcipher_recvmsg,
208 .poll = af_alg_poll,
209};
210
211static int skcipher_check_key(struct socket *sock)
212{
213 int err = 0;
214 struct sock *psk;
215 struct alg_sock *pask;
216 struct crypto_skcipher *tfm;
217 struct sock *sk = sock->sk;
218 struct alg_sock *ask = alg_sk(sk);
219
220 lock_sock(sk);
221 if (ask->refcnt)
222 goto unlock_child;
223
224 psk = ask->parent;
225 pask = alg_sk(ask->parent);
226 tfm = pask->private;
227
228 err = -ENOKEY;
229 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
230 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
231 goto unlock;
232
233 if (!pask->refcnt++)
234 sock_hold(psk);
235
236 ask->refcnt = 1;
237 sock_put(psk);
238
239 err = 0;
240
241unlock:
242 release_sock(psk);
243unlock_child:
244 release_sock(sk);
245
246 return err;
247}
248
249static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
250 size_t size)
251{
252 int err;
253
254 err = skcipher_check_key(sock);
255 if (err)
256 return err;
257
258 return skcipher_sendmsg(sock, msg, size);
259}
260
261static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
262 int offset, size_t size, int flags)
263{
264 int err;
265
266 err = skcipher_check_key(sock);
267 if (err)
268 return err;
269
270 return af_alg_sendpage(sock, page, offset, size, flags);
271}
272
273static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
274 size_t ignored, int flags)
275{
276 int err;
277
278 err = skcipher_check_key(sock);
279 if (err)
280 return err;
281
282 return skcipher_recvmsg(sock, msg, ignored, flags);
283}
284
285static struct proto_ops algif_skcipher_ops_nokey = {
286 .family = PF_ALG,
287
288 .connect = sock_no_connect,
289 .socketpair = sock_no_socketpair,
290 .getname = sock_no_getname,
291 .ioctl = sock_no_ioctl,
292 .listen = sock_no_listen,
293 .shutdown = sock_no_shutdown,
294 .getsockopt = sock_no_getsockopt,
295 .mmap = sock_no_mmap,
296 .bind = sock_no_bind,
297 .accept = sock_no_accept,
298 .setsockopt = sock_no_setsockopt,
299
300 .release = af_alg_release,
301 .sendmsg = skcipher_sendmsg_nokey,
302 .sendpage = skcipher_sendpage_nokey,
303 .recvmsg = skcipher_recvmsg_nokey,
304 .poll = af_alg_poll,
305};
306
307static void *skcipher_bind(const char *name, u32 type, u32 mask)
308{
309 return crypto_alloc_skcipher(name, type, mask);
310}
311
312static void skcipher_release(void *private)
313{
314 crypto_free_skcipher(private);
315}
316
317static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
318{
319 return crypto_skcipher_setkey(private, key, keylen);
320}
321
322static void skcipher_sock_destruct(struct sock *sk)
323{
324 struct alg_sock *ask = alg_sk(sk);
325 struct af_alg_ctx *ctx = ask->private;
326 struct sock *psk = ask->parent;
327 struct alg_sock *pask = alg_sk(psk);
328 struct crypto_skcipher *tfm = pask->private;
329
330 af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
331 sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm));
332 sock_kfree_s(sk, ctx, ctx->len);
333 af_alg_release_parent(sk);
334}
335
336static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
337{
338 struct af_alg_ctx *ctx;
339 struct alg_sock *ask = alg_sk(sk);
340 struct crypto_skcipher *tfm = private;
341 unsigned int len = sizeof(*ctx);
342
343 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
344 if (!ctx)
345 return -ENOMEM;
346
347 ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
348 GFP_KERNEL);
349 if (!ctx->iv) {
350 sock_kfree_s(sk, ctx, len);
351 return -ENOMEM;
352 }
353
354 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
355
356 INIT_LIST_HEAD(&ctx->tsgl_list);
357 ctx->len = len;
358 ctx->used = 0;
359 atomic_set(&ctx->rcvused, 0);
360 ctx->more = 0;
361 ctx->merge = 0;
362 ctx->enc = 0;
363 crypto_init_wait(&ctx->wait);
364
365 ask->private = ctx;
366
367 sk->sk_destruct = skcipher_sock_destruct;
368
369 return 0;
370}
371
372static int skcipher_accept_parent(void *private, struct sock *sk)
373{
374 struct crypto_skcipher *tfm = private;
375
376 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
377 return -ENOKEY;
378
379 return skcipher_accept_parent_nokey(private, sk);
380}
381
382static const struct af_alg_type algif_type_skcipher = {
383 .bind = skcipher_bind,
384 .release = skcipher_release,
385 .setkey = skcipher_setkey,
386 .accept = skcipher_accept_parent,
387 .accept_nokey = skcipher_accept_parent_nokey,
388 .ops = &algif_skcipher_ops,
389 .ops_nokey = &algif_skcipher_ops_nokey,
390 .name = "skcipher",
391 .owner = THIS_MODULE
392};
393
394static int __init algif_skcipher_init(void)
395{
396 return af_alg_register_type(&algif_type_skcipher);
397}
398
399static void __exit algif_skcipher_exit(void)
400{
401 int err = af_alg_unregister_type(&algif_type_skcipher);
402 BUG_ON(err);
403}
404
405module_init(algif_skcipher_init);
406module_exit(algif_skcipher_exit);
407MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * algif_skcipher: User-space interface for skcipher algorithms
4 *
5 * This file provides the user-space API for symmetric key ciphers.
6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * The following concept of the memory management is used:
10 *
11 * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
12 * filled by user space with the data submitted via sendpage/sendmsg. Filling
13 * up the TX SGL does not cause a crypto operation -- the data will only be
14 * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
15 * provide a buffer which is tracked with the RX SGL.
16 *
17 * During the processing of the recvmsg operation, the cipher request is
18 * allocated and prepared. As part of the recvmsg operation, the processed
19 * TX buffers are extracted from the TX SGL into a separate SGL.
20 *
21 * After the completion of the crypto operation, the RX SGL and the cipher
22 * request is released. The extracted TX SGL parts are released together with
23 * the RX SGL release.
24 */
25
26#include <crypto/scatterwalk.h>
27#include <crypto/skcipher.h>
28#include <crypto/if_alg.h>
29#include <linux/init.h>
30#include <linux/list.h>
31#include <linux/kernel.h>
32#include <linux/mm.h>
33#include <linux/module.h>
34#include <linux/net.h>
35#include <net/sock.h>
36
37static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
38 size_t size)
39{
40 struct sock *sk = sock->sk;
41 struct alg_sock *ask = alg_sk(sk);
42 struct sock *psk = ask->parent;
43 struct alg_sock *pask = alg_sk(psk);
44 struct crypto_skcipher *tfm = pask->private;
45 unsigned ivsize = crypto_skcipher_ivsize(tfm);
46
47 return af_alg_sendmsg(sock, msg, size, ivsize);
48}
49
50static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
51 size_t ignored, int flags)
52{
53 struct sock *sk = sock->sk;
54 struct alg_sock *ask = alg_sk(sk);
55 struct sock *psk = ask->parent;
56 struct alg_sock *pask = alg_sk(psk);
57 struct af_alg_ctx *ctx = ask->private;
58 struct crypto_skcipher *tfm = pask->private;
59 unsigned int bs = crypto_skcipher_blocksize(tfm);
60 struct af_alg_async_req *areq;
61 int err = 0;
62 size_t len = 0;
63
64 if (!ctx->used) {
65 err = af_alg_wait_for_data(sk, flags);
66 if (err)
67 return err;
68 }
69
70 /* Allocate cipher request for current operation. */
71 areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
72 crypto_skcipher_reqsize(tfm));
73 if (IS_ERR(areq))
74 return PTR_ERR(areq);
75
76 /* convert iovecs of output buffers into RX SGL */
77 err = af_alg_get_rsgl(sk, msg, flags, areq, -1, &len);
78 if (err)
79 goto free;
80
81 /* Process only as much RX buffers for which we have TX data */
82 if (len > ctx->used)
83 len = ctx->used;
84
85 /*
86 * If more buffers are to be expected to be processed, process only
87 * full block size buffers.
88 */
89 if (ctx->more || len < ctx->used)
90 len -= len % bs;
91
92 /*
93 * Create a per request TX SGL for this request which tracks the
94 * SG entries from the global TX SGL.
95 */
96 areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0);
97 if (!areq->tsgl_entries)
98 areq->tsgl_entries = 1;
99 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
100 areq->tsgl_entries),
101 GFP_KERNEL);
102 if (!areq->tsgl) {
103 err = -ENOMEM;
104 goto free;
105 }
106 sg_init_table(areq->tsgl, areq->tsgl_entries);
107 af_alg_pull_tsgl(sk, len, areq->tsgl, 0);
108
109 /* Initialize the crypto operation */
110 skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
111 skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
112 areq->first_rsgl.sgl.sg, len, ctx->iv);
113
114 if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
115 /* AIO operation */
116 sock_hold(sk);
117 areq->iocb = msg->msg_iocb;
118
119 /* Remember output size that will be generated. */
120 areq->outlen = len;
121
122 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
123 CRYPTO_TFM_REQ_MAY_SLEEP,
124 af_alg_async_cb, areq);
125 err = ctx->enc ?
126 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
127 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
128
129 /* AIO operation in progress */
130 if (err == -EINPROGRESS || err == -EBUSY)
131 return -EIOCBQUEUED;
132
133 sock_put(sk);
134 } else {
135 /* Synchronous operation */
136 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
137 CRYPTO_TFM_REQ_MAY_SLEEP |
138 CRYPTO_TFM_REQ_MAY_BACKLOG,
139 crypto_req_done, &ctx->wait);
140 err = crypto_wait_req(ctx->enc ?
141 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
142 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req),
143 &ctx->wait);
144 }
145
146
147free:
148 af_alg_free_resources(areq);
149
150 return err ? err : len;
151}
152
153static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
154 size_t ignored, int flags)
155{
156 struct sock *sk = sock->sk;
157 int ret = 0;
158
159 lock_sock(sk);
160 while (msg_data_left(msg)) {
161 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
162
163 /*
164 * This error covers -EIOCBQUEUED which implies that we can
165 * only handle one AIO request. If the caller wants to have
166 * multiple AIO requests in parallel, he must make multiple
167 * separate AIO calls.
168 *
169 * Also return the error if no data has been processed so far.
170 */
171 if (err <= 0) {
172 if (err == -EIOCBQUEUED || !ret)
173 ret = err;
174 goto out;
175 }
176
177 ret += err;
178 }
179
180out:
181 af_alg_wmem_wakeup(sk);
182 release_sock(sk);
183 return ret;
184}
185
186static struct proto_ops algif_skcipher_ops = {
187 .family = PF_ALG,
188
189 .connect = sock_no_connect,
190 .socketpair = sock_no_socketpair,
191 .getname = sock_no_getname,
192 .ioctl = sock_no_ioctl,
193 .listen = sock_no_listen,
194 .shutdown = sock_no_shutdown,
195 .getsockopt = sock_no_getsockopt,
196 .mmap = sock_no_mmap,
197 .bind = sock_no_bind,
198 .accept = sock_no_accept,
199 .setsockopt = sock_no_setsockopt,
200
201 .release = af_alg_release,
202 .sendmsg = skcipher_sendmsg,
203 .sendpage = af_alg_sendpage,
204 .recvmsg = skcipher_recvmsg,
205 .poll = af_alg_poll,
206};
207
208static int skcipher_check_key(struct socket *sock)
209{
210 int err = 0;
211 struct sock *psk;
212 struct alg_sock *pask;
213 struct crypto_skcipher *tfm;
214 struct sock *sk = sock->sk;
215 struct alg_sock *ask = alg_sk(sk);
216
217 lock_sock(sk);
218 if (ask->refcnt)
219 goto unlock_child;
220
221 psk = ask->parent;
222 pask = alg_sk(ask->parent);
223 tfm = pask->private;
224
225 err = -ENOKEY;
226 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
227 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
228 goto unlock;
229
230 if (!pask->refcnt++)
231 sock_hold(psk);
232
233 ask->refcnt = 1;
234 sock_put(psk);
235
236 err = 0;
237
238unlock:
239 release_sock(psk);
240unlock_child:
241 release_sock(sk);
242
243 return err;
244}
245
246static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
247 size_t size)
248{
249 int err;
250
251 err = skcipher_check_key(sock);
252 if (err)
253 return err;
254
255 return skcipher_sendmsg(sock, msg, size);
256}
257
258static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
259 int offset, size_t size, int flags)
260{
261 int err;
262
263 err = skcipher_check_key(sock);
264 if (err)
265 return err;
266
267 return af_alg_sendpage(sock, page, offset, size, flags);
268}
269
270static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
271 size_t ignored, int flags)
272{
273 int err;
274
275 err = skcipher_check_key(sock);
276 if (err)
277 return err;
278
279 return skcipher_recvmsg(sock, msg, ignored, flags);
280}
281
282static struct proto_ops algif_skcipher_ops_nokey = {
283 .family = PF_ALG,
284
285 .connect = sock_no_connect,
286 .socketpair = sock_no_socketpair,
287 .getname = sock_no_getname,
288 .ioctl = sock_no_ioctl,
289 .listen = sock_no_listen,
290 .shutdown = sock_no_shutdown,
291 .getsockopt = sock_no_getsockopt,
292 .mmap = sock_no_mmap,
293 .bind = sock_no_bind,
294 .accept = sock_no_accept,
295 .setsockopt = sock_no_setsockopt,
296
297 .release = af_alg_release,
298 .sendmsg = skcipher_sendmsg_nokey,
299 .sendpage = skcipher_sendpage_nokey,
300 .recvmsg = skcipher_recvmsg_nokey,
301 .poll = af_alg_poll,
302};
303
304static void *skcipher_bind(const char *name, u32 type, u32 mask)
305{
306 return crypto_alloc_skcipher(name, type, mask);
307}
308
309static void skcipher_release(void *private)
310{
311 crypto_free_skcipher(private);
312}
313
314static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
315{
316 return crypto_skcipher_setkey(private, key, keylen);
317}
318
319static void skcipher_sock_destruct(struct sock *sk)
320{
321 struct alg_sock *ask = alg_sk(sk);
322 struct af_alg_ctx *ctx = ask->private;
323 struct sock *psk = ask->parent;
324 struct alg_sock *pask = alg_sk(psk);
325 struct crypto_skcipher *tfm = pask->private;
326
327 af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
328 sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm));
329 sock_kfree_s(sk, ctx, ctx->len);
330 af_alg_release_parent(sk);
331}
332
333static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
334{
335 struct af_alg_ctx *ctx;
336 struct alg_sock *ask = alg_sk(sk);
337 struct crypto_skcipher *tfm = private;
338 unsigned int len = sizeof(*ctx);
339
340 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
341 if (!ctx)
342 return -ENOMEM;
343
344 ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
345 GFP_KERNEL);
346 if (!ctx->iv) {
347 sock_kfree_s(sk, ctx, len);
348 return -ENOMEM;
349 }
350
351 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
352
353 INIT_LIST_HEAD(&ctx->tsgl_list);
354 ctx->len = len;
355 ctx->used = 0;
356 atomic_set(&ctx->rcvused, 0);
357 ctx->more = 0;
358 ctx->merge = 0;
359 ctx->enc = 0;
360 crypto_init_wait(&ctx->wait);
361
362 ask->private = ctx;
363
364 sk->sk_destruct = skcipher_sock_destruct;
365
366 return 0;
367}
368
369static int skcipher_accept_parent(void *private, struct sock *sk)
370{
371 struct crypto_skcipher *tfm = private;
372
373 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
374 return -ENOKEY;
375
376 return skcipher_accept_parent_nokey(private, sk);
377}
378
379static const struct af_alg_type algif_type_skcipher = {
380 .bind = skcipher_bind,
381 .release = skcipher_release,
382 .setkey = skcipher_setkey,
383 .accept = skcipher_accept_parent,
384 .accept_nokey = skcipher_accept_parent_nokey,
385 .ops = &algif_skcipher_ops,
386 .ops_nokey = &algif_skcipher_ops_nokey,
387 .name = "skcipher",
388 .owner = THIS_MODULE
389};
390
391static int __init algif_skcipher_init(void)
392{
393 return af_alg_register_type(&algif_type_skcipher);
394}
395
396static void __exit algif_skcipher_exit(void)
397{
398 int err = af_alg_unregister_type(&algif_type_skcipher);
399 BUG_ON(err);
400}
401
402module_init(algif_skcipher_init);
403module_exit(algif_skcipher_exit);
404MODULE_LICENSE("GPL");