aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/cryptd.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/cryptd.c')
-rw-r--r--crypto/cryptd.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/crypto/cryptd.c b/crypto/cryptd.c
new file mode 100644
index 000000000000..3ff4e1f0f032
--- /dev/null
+++ b/crypto/cryptd.c
@@ -0,0 +1,375 @@
1/*
2 * Software async crypto daemon.
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/algapi.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/kthread.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/scatterlist.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25
26#define CRYPTD_MAX_QLEN 100
27
28struct cryptd_state {
29 spinlock_t lock;
30 struct mutex mutex;
31 struct crypto_queue queue;
32 struct task_struct *task;
33};
34
35struct cryptd_instance_ctx {
36 struct crypto_spawn spawn;
37 struct cryptd_state *state;
38};
39
40struct cryptd_blkcipher_ctx {
41 struct crypto_blkcipher *child;
42};
43
44struct cryptd_blkcipher_request_ctx {
45 crypto_completion_t complete;
46};
47
48
49static inline struct cryptd_state *cryptd_get_state(struct crypto_tfm *tfm)
50{
51 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
52 struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
53 return ictx->state;
54}
55
56static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
57 const u8 *key, unsigned int keylen)
58{
59 struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
60 struct crypto_blkcipher *child = ctx->child;
61 int err;
62
63 crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
64 crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
65 CRYPTO_TFM_REQ_MASK);
66 err = crypto_blkcipher_setkey(child, key, keylen);
67 crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
68 CRYPTO_TFM_RES_MASK);
69 return err;
70}
71
72static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
73 struct crypto_blkcipher *child,
74 int err,
75 int (*crypt)(struct blkcipher_desc *desc,
76 struct scatterlist *dst,
77 struct scatterlist *src,
78 unsigned int len))
79{
80 struct cryptd_blkcipher_request_ctx *rctx;
81 struct blkcipher_desc desc;
82
83 rctx = ablkcipher_request_ctx(req);
84
85 if (unlikely(err == -EINPROGRESS)) {
86 rctx->complete(&req->base, err);
87 return;
88 }
89
90 desc.tfm = child;
91 desc.info = req->info;
92 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
93
94 err = crypt(&desc, req->dst, req->src, req->nbytes);
95
96 req->base.complete = rctx->complete;
97
98 local_bh_disable();
99 req->base.complete(&req->base, err);
100 local_bh_enable();
101}
102
103static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
104{
105 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
106 struct crypto_blkcipher *child = ctx->child;
107
108 cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
109 crypto_blkcipher_crt(child)->encrypt);
110}
111
112static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
113{
114 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
115 struct crypto_blkcipher *child = ctx->child;
116
117 cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
118 crypto_blkcipher_crt(child)->decrypt);
119}
120
121static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
122 crypto_completion_t complete)
123{
124 struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
125 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
126 struct cryptd_state *state =
127 cryptd_get_state(crypto_ablkcipher_tfm(tfm));
128 int err;
129
130 rctx->complete = req->base.complete;
131 req->base.complete = complete;
132
133 spin_lock_bh(&state->lock);
134 err = ablkcipher_enqueue_request(crypto_ablkcipher_alg(tfm), req);
135 spin_unlock_bh(&state->lock);
136
137 wake_up_process(state->task);
138 return err;
139}
140
141static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
142{
143 return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
144}
145
146static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
147{
148 return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
149}
150
151static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
152{
153 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
154 struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
155 struct crypto_spawn *spawn = &ictx->spawn;
156 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
157 struct crypto_blkcipher *cipher;
158
159 cipher = crypto_spawn_blkcipher(spawn);
160 if (IS_ERR(cipher))
161 return PTR_ERR(cipher);
162
163 ctx->child = cipher;
164 tfm->crt_ablkcipher.reqsize =
165 sizeof(struct cryptd_blkcipher_request_ctx);
166 return 0;
167}
168
169static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
170{
171 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
172 struct cryptd_state *state = cryptd_get_state(tfm);
173 int active;
174
175 mutex_lock(&state->mutex);
176 active = ablkcipher_tfm_in_queue(__crypto_ablkcipher_cast(tfm));
177 mutex_unlock(&state->mutex);
178
179 BUG_ON(active);
180
181 crypto_free_blkcipher(ctx->child);
182}
183
184static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
185 struct cryptd_state *state)
186{
187 struct crypto_instance *inst;
188 struct cryptd_instance_ctx *ctx;
189 int err;
190
191 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
192 if (IS_ERR(inst))
193 goto out;
194
195 err = -ENAMETOOLONG;
196 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
197 "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
198 goto out_free_inst;
199
200 ctx = crypto_instance_ctx(inst);
201 err = crypto_init_spawn(&ctx->spawn, alg, inst,
202 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
203 if (err)
204 goto out_free_inst;
205
206 ctx->state = state;
207
208 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
209
210 inst->alg.cra_priority = alg->cra_priority + 50;
211 inst->alg.cra_blocksize = alg->cra_blocksize;
212 inst->alg.cra_alignmask = alg->cra_alignmask;
213
214out:
215 return inst;
216
217out_free_inst:
218 kfree(inst);
219 inst = ERR_PTR(err);
220 goto out;
221}
222
223static struct crypto_instance *cryptd_alloc_blkcipher(
224 struct rtattr **tb, struct cryptd_state *state)
225{
226 struct crypto_instance *inst;
227 struct crypto_alg *alg;
228
229 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
230 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
231 if (IS_ERR(alg))
232 return ERR_PTR(PTR_ERR(alg));
233
234 inst = cryptd_alloc_instance(alg, state);
235 if (IS_ERR(inst))
236 goto out_put_alg;
237
238 inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_ASYNC;
239 inst->alg.cra_type = &crypto_ablkcipher_type;
240
241 inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
242 inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
243 inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
244
245 inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
246
247 inst->alg.cra_init = cryptd_blkcipher_init_tfm;
248 inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
249
250 inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
251 inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
252 inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
253
254 inst->alg.cra_ablkcipher.queue = &state->queue;
255
256out_put_alg:
257 crypto_mod_put(alg);
258 return inst;
259}
260
261static struct cryptd_state state;
262
263static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
264{
265 struct crypto_attr_type *algt;
266
267 algt = crypto_get_attr_type(tb);
268 if (IS_ERR(algt))
269 return ERR_PTR(PTR_ERR(algt));
270
271 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
272 case CRYPTO_ALG_TYPE_BLKCIPHER:
273 return cryptd_alloc_blkcipher(tb, &state);
274 }
275
276 return ERR_PTR(-EINVAL);
277}
278
279static void cryptd_free(struct crypto_instance *inst)
280{
281 struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
282
283 crypto_drop_spawn(&ctx->spawn);
284 kfree(inst);
285}
286
287static struct crypto_template cryptd_tmpl = {
288 .name = "cryptd",
289 .alloc = cryptd_alloc,
290 .free = cryptd_free,
291 .module = THIS_MODULE,
292};
293
294static inline int cryptd_create_thread(struct cryptd_state *state,
295 int (*fn)(void *data), const char *name)
296{
297 spin_lock_init(&state->lock);
298 mutex_init(&state->mutex);
299 crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);
300
301 state->task = kthread_create(fn, state, name);
302 if (IS_ERR(state->task))
303 return PTR_ERR(state->task);
304
305 return 0;
306}
307
308static inline void cryptd_stop_thread(struct cryptd_state *state)
309{
310 BUG_ON(state->queue.qlen);
311 kthread_stop(state->task);
312}
313
314static int cryptd_thread(void *data)
315{
316 struct cryptd_state *state = data;
317 int stop;
318
319 do {
320 struct crypto_async_request *req, *backlog;
321
322 mutex_lock(&state->mutex);
323 __set_current_state(TASK_INTERRUPTIBLE);
324
325 spin_lock_bh(&state->lock);
326 backlog = crypto_get_backlog(&state->queue);
327 req = crypto_dequeue_request(&state->queue);
328 spin_unlock_bh(&state->lock);
329
330 stop = kthread_should_stop();
331
332 if (stop || req) {
333 __set_current_state(TASK_RUNNING);
334 if (req) {
335 if (backlog)
336 backlog->complete(backlog,
337 -EINPROGRESS);
338 req->complete(req, 0);
339 }
340 }
341
342 mutex_unlock(&state->mutex);
343
344 schedule();
345 } while (!stop);
346
347 return 0;
348}
349
350static int __init cryptd_init(void)
351{
352 int err;
353
354 err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
355 if (err)
356 return err;
357
358 err = crypto_register_template(&cryptd_tmpl);
359 if (err)
360 kthread_stop(state.task);
361
362 return err;
363}
364
365static void __exit cryptd_exit(void)
366{
367 cryptd_stop_thread(&state);
368 crypto_unregister_template(&cryptd_tmpl);
369}
370
371module_init(cryptd_init);
372module_exit(cryptd_exit);
373
374MODULE_LICENSE("GPL");
375MODULE_DESCRIPTION("Software async crypto daemon");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 06:14:58 -0500