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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");
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_chunksize(tfm);
60 struct af_alg_async_req *areq;
61 int err = 0;
62 size_t len = 0;
63
64 if (!ctx->init || (ctx->more && ctx->used < bs)) {
65 err = af_alg_wait_for_data(sk, flags, bs);
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, ctx->used, &len);
78 if (err)
79 goto free;
80
81 /*
82 * If more buffers are to be expected to be processed, process only
83 * full block size buffers.
84 */
85 if (ctx->more || len < ctx->used)
86 len -= len % bs;
87
88 /*
89 * Create a per request TX SGL for this request which tracks the
90 * SG entries from the global TX SGL.
91 */
92 areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0);
93 if (!areq->tsgl_entries)
94 areq->tsgl_entries = 1;
95 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
96 areq->tsgl_entries),
97 GFP_KERNEL);
98 if (!areq->tsgl) {
99 err = -ENOMEM;
100 goto free;
101 }
102 sg_init_table(areq->tsgl, areq->tsgl_entries);
103 af_alg_pull_tsgl(sk, len, areq->tsgl, 0);
104
105 /* Initialize the crypto operation */
106 skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
107 skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
108 areq->first_rsgl.sgl.sg, len, ctx->iv);
109
110 if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
111 /* AIO operation */
112 sock_hold(sk);
113 areq->iocb = msg->msg_iocb;
114
115 /* Remember output size that will be generated. */
116 areq->outlen = len;
117
118 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
119 CRYPTO_TFM_REQ_MAY_SLEEP,
120 af_alg_async_cb, areq);
121 err = ctx->enc ?
122 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
123 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
124
125 /* AIO operation in progress */
126 if (err == -EINPROGRESS || err == -EBUSY)
127 return -EIOCBQUEUED;
128
129 sock_put(sk);
130 } else {
131 /* Synchronous operation */
132 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
133 CRYPTO_TFM_REQ_MAY_SLEEP |
134 CRYPTO_TFM_REQ_MAY_BACKLOG,
135 crypto_req_done, &ctx->wait);
136 err = crypto_wait_req(ctx->enc ?
137 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
138 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req),
139 &ctx->wait);
140 }
141
142
143free:
144 af_alg_free_resources(areq);
145
146 return err ? err : len;
147}
148
149static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
150 size_t ignored, int flags)
151{
152 struct sock *sk = sock->sk;
153 int ret = 0;
154
155 lock_sock(sk);
156 while (msg_data_left(msg)) {
157 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
158
159 /*
160 * This error covers -EIOCBQUEUED which implies that we can
161 * only handle one AIO request. If the caller wants to have
162 * multiple AIO requests in parallel, he must make multiple
163 * separate AIO calls.
164 *
165 * Also return the error if no data has been processed so far.
166 */
167 if (err <= 0) {
168 if (err == -EIOCBQUEUED || !ret)
169 ret = err;
170 goto out;
171 }
172
173 ret += err;
174 }
175
176out:
177 af_alg_wmem_wakeup(sk);
178 release_sock(sk);
179 return ret;
180}
181
182static struct proto_ops algif_skcipher_ops = {
183 .family = PF_ALG,
184
185 .connect = sock_no_connect,
186 .socketpair = sock_no_socketpair,
187 .getname = sock_no_getname,
188 .ioctl = sock_no_ioctl,
189 .listen = sock_no_listen,
190 .shutdown = sock_no_shutdown,
191 .mmap = sock_no_mmap,
192 .bind = sock_no_bind,
193 .accept = sock_no_accept,
194
195 .release = af_alg_release,
196 .sendmsg = skcipher_sendmsg,
197 .sendpage = af_alg_sendpage,
198 .recvmsg = skcipher_recvmsg,
199 .poll = af_alg_poll,
200};
201
202static int skcipher_check_key(struct socket *sock)
203{
204 int err = 0;
205 struct sock *psk;
206 struct alg_sock *pask;
207 struct crypto_skcipher *tfm;
208 struct sock *sk = sock->sk;
209 struct alg_sock *ask = alg_sk(sk);
210
211 lock_sock(sk);
212 if (!atomic_read(&ask->nokey_refcnt))
213 goto unlock_child;
214
215 psk = ask->parent;
216 pask = alg_sk(ask->parent);
217 tfm = pask->private;
218
219 err = -ENOKEY;
220 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
221 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
222 goto unlock;
223
224 atomic_dec(&pask->nokey_refcnt);
225 atomic_set(&ask->nokey_refcnt, 0);
226
227 err = 0;
228
229unlock:
230 release_sock(psk);
231unlock_child:
232 release_sock(sk);
233
234 return err;
235}
236
237static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
238 size_t size)
239{
240 int err;
241
242 err = skcipher_check_key(sock);
243 if (err)
244 return err;
245
246 return skcipher_sendmsg(sock, msg, size);
247}
248
249static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
250 int offset, size_t size, int flags)
251{
252 int err;
253
254 err = skcipher_check_key(sock);
255 if (err)
256 return err;
257
258 return af_alg_sendpage(sock, page, offset, size, flags);
259}
260
261static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
262 size_t ignored, int flags)
263{
264 int err;
265
266 err = skcipher_check_key(sock);
267 if (err)
268 return err;
269
270 return skcipher_recvmsg(sock, msg, ignored, flags);
271}
272
273static struct proto_ops algif_skcipher_ops_nokey = {
274 .family = PF_ALG,
275
276 .connect = sock_no_connect,
277 .socketpair = sock_no_socketpair,
278 .getname = sock_no_getname,
279 .ioctl = sock_no_ioctl,
280 .listen = sock_no_listen,
281 .shutdown = sock_no_shutdown,
282 .mmap = sock_no_mmap,
283 .bind = sock_no_bind,
284 .accept = sock_no_accept,
285
286 .release = af_alg_release,
287 .sendmsg = skcipher_sendmsg_nokey,
288 .sendpage = skcipher_sendpage_nokey,
289 .recvmsg = skcipher_recvmsg_nokey,
290 .poll = af_alg_poll,
291};
292
293static void *skcipher_bind(const char *name, u32 type, u32 mask)
294{
295 return crypto_alloc_skcipher(name, type, mask);
296}
297
298static void skcipher_release(void *private)
299{
300 crypto_free_skcipher(private);
301}
302
303static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
304{
305 return crypto_skcipher_setkey(private, key, keylen);
306}
307
308static void skcipher_sock_destruct(struct sock *sk)
309{
310 struct alg_sock *ask = alg_sk(sk);
311 struct af_alg_ctx *ctx = ask->private;
312 struct sock *psk = ask->parent;
313 struct alg_sock *pask = alg_sk(psk);
314 struct crypto_skcipher *tfm = pask->private;
315
316 af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
317 sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm));
318 sock_kfree_s(sk, ctx, ctx->len);
319 af_alg_release_parent(sk);
320}
321
322static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
323{
324 struct af_alg_ctx *ctx;
325 struct alg_sock *ask = alg_sk(sk);
326 struct crypto_skcipher *tfm = private;
327 unsigned int len = sizeof(*ctx);
328
329 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
330 if (!ctx)
331 return -ENOMEM;
332 memset(ctx, 0, len);
333
334 ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
335 GFP_KERNEL);
336 if (!ctx->iv) {
337 sock_kfree_s(sk, ctx, len);
338 return -ENOMEM;
339 }
340 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
341
342 INIT_LIST_HEAD(&ctx->tsgl_list);
343 ctx->len = len;
344 crypto_init_wait(&ctx->wait);
345
346 ask->private = ctx;
347
348 sk->sk_destruct = skcipher_sock_destruct;
349
350 return 0;
351}
352
353static int skcipher_accept_parent(void *private, struct sock *sk)
354{
355 struct crypto_skcipher *tfm = private;
356
357 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
358 return -ENOKEY;
359
360 return skcipher_accept_parent_nokey(private, sk);
361}
362
363static const struct af_alg_type algif_type_skcipher = {
364 .bind = skcipher_bind,
365 .release = skcipher_release,
366 .setkey = skcipher_setkey,
367 .accept = skcipher_accept_parent,
368 .accept_nokey = skcipher_accept_parent_nokey,
369 .ops = &algif_skcipher_ops,
370 .ops_nokey = &algif_skcipher_ops_nokey,
371 .name = "skcipher",
372 .owner = THIS_MODULE
373};
374
375static int __init algif_skcipher_init(void)
376{
377 return af_alg_register_type(&algif_type_skcipher);
378}
379
380static void __exit algif_skcipher_exit(void)
381{
382 int err = af_alg_unregister_type(&algif_type_skcipher);
383 BUG_ON(err);
384}
385
386module_init(algif_skcipher_init);
387module_exit(algif_skcipher_exit);
388MODULE_LICENSE("GPL");