Root/crypto/cryptd.c

1/*
2 * Software async crypto daemon.
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * Added AEAD support to cryptd.
7 * Authors: Tadeusz Struk (tadeusz.struk@intel.com)
8 * Adrian Hoban <adrian.hoban@intel.com>
9 * Gabriele Paoloni <gabriele.paoloni@intel.com>
10 * Aidan O'Mahony (aidan.o.mahony@intel.com)
11 * Copyright (c) 2010, Intel Corporation.
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
17 *
18 */
19
20#include <crypto/algapi.h>
21#include <crypto/internal/hash.h>
22#include <crypto/internal/aead.h>
23#include <crypto/cryptd.h>
24#include <crypto/crypto_wq.h>
25#include <linux/err.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/list.h>
29#include <linux/module.h>
30#include <linux/scatterlist.h>
31#include <linux/sched.h>
32#include <linux/slab.h>
33
34#define CRYPTD_MAX_CPU_QLEN 100
35
36struct cryptd_cpu_queue {
37    struct crypto_queue queue;
38    struct work_struct work;
39};
40
41struct cryptd_queue {
42    struct cryptd_cpu_queue __percpu *cpu_queue;
43};
44
45struct cryptd_instance_ctx {
46    struct crypto_spawn spawn;
47    struct cryptd_queue *queue;
48};
49
50struct hashd_instance_ctx {
51    struct crypto_shash_spawn spawn;
52    struct cryptd_queue *queue;
53};
54
55struct aead_instance_ctx {
56    struct crypto_aead_spawn aead_spawn;
57    struct cryptd_queue *queue;
58};
59
60struct cryptd_blkcipher_ctx {
61    struct crypto_blkcipher *child;
62};
63
64struct cryptd_blkcipher_request_ctx {
65    crypto_completion_t complete;
66};
67
68struct cryptd_hash_ctx {
69    struct crypto_shash *child;
70};
71
72struct cryptd_hash_request_ctx {
73    crypto_completion_t complete;
74    struct shash_desc desc;
75};
76
77struct cryptd_aead_ctx {
78    struct crypto_aead *child;
79};
80
81struct cryptd_aead_request_ctx {
82    crypto_completion_t complete;
83};
84
85static void cryptd_queue_worker(struct work_struct *work);
86
87static int cryptd_init_queue(struct cryptd_queue *queue,
88                 unsigned int max_cpu_qlen)
89{
90    int cpu;
91    struct cryptd_cpu_queue *cpu_queue;
92
93    queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
94    if (!queue->cpu_queue)
95        return -ENOMEM;
96    for_each_possible_cpu(cpu) {
97        cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
98        crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
99        INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
100    }
101    return 0;
102}
103
104static void cryptd_fini_queue(struct cryptd_queue *queue)
105{
106    int cpu;
107    struct cryptd_cpu_queue *cpu_queue;
108
109    for_each_possible_cpu(cpu) {
110        cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
111        BUG_ON(cpu_queue->queue.qlen);
112    }
113    free_percpu(queue->cpu_queue);
114}
115
116static int cryptd_enqueue_request(struct cryptd_queue *queue,
117                  struct crypto_async_request *request)
118{
119    int cpu, err;
120    struct cryptd_cpu_queue *cpu_queue;
121
122    cpu = get_cpu();
123    cpu_queue = this_cpu_ptr(queue->cpu_queue);
124    err = crypto_enqueue_request(&cpu_queue->queue, request);
125    queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
126    put_cpu();
127
128    return err;
129}
130
131/* Called in workqueue context, do one real cryption work (via
132 * req->complete) and reschedule itself if there are more work to
133 * do. */
134static void cryptd_queue_worker(struct work_struct *work)
135{
136    struct cryptd_cpu_queue *cpu_queue;
137    struct crypto_async_request *req, *backlog;
138
139    cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
140    /* Only handle one request at a time to avoid hogging crypto
141     * workqueue. preempt_disable/enable is used to prevent
142     * being preempted by cryptd_enqueue_request() */
143    preempt_disable();
144    backlog = crypto_get_backlog(&cpu_queue->queue);
145    req = crypto_dequeue_request(&cpu_queue->queue);
146    preempt_enable();
147
148    if (!req)
149        return;
150
151    if (backlog)
152        backlog->complete(backlog, -EINPROGRESS);
153    req->complete(req, 0);
154
155    if (cpu_queue->queue.qlen)
156        queue_work(kcrypto_wq, &cpu_queue->work);
157}
158
159static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
160{
161    struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
162    struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
163    return ictx->queue;
164}
165
166static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
167                   const u8 *key, unsigned int keylen)
168{
169    struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
170    struct crypto_blkcipher *child = ctx->child;
171    int err;
172
173    crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
174    crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
175                      CRYPTO_TFM_REQ_MASK);
176    err = crypto_blkcipher_setkey(child, key, keylen);
177    crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
178                        CRYPTO_TFM_RES_MASK);
179    return err;
180}
181
182static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
183                   struct crypto_blkcipher *child,
184                   int err,
185                   int (*crypt)(struct blkcipher_desc *desc,
186                        struct scatterlist *dst,
187                        struct scatterlist *src,
188                        unsigned int len))
189{
190    struct cryptd_blkcipher_request_ctx *rctx;
191    struct blkcipher_desc desc;
192
193    rctx = ablkcipher_request_ctx(req);
194
195    if (unlikely(err == -EINPROGRESS))
196        goto out;
197
198    desc.tfm = child;
199    desc.info = req->info;
200    desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
201
202    err = crypt(&desc, req->dst, req->src, req->nbytes);
203
204    req->base.complete = rctx->complete;
205
206out:
207    local_bh_disable();
208    rctx->complete(&req->base, err);
209    local_bh_enable();
210}
211
212static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
213{
214    struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
215    struct crypto_blkcipher *child = ctx->child;
216
217    cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
218                   crypto_blkcipher_crt(child)->encrypt);
219}
220
221static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
222{
223    struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
224    struct crypto_blkcipher *child = ctx->child;
225
226    cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
227                   crypto_blkcipher_crt(child)->decrypt);
228}
229
230static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
231                    crypto_completion_t complete)
232{
233    struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
234    struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
235    struct cryptd_queue *queue;
236
237    queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
238    rctx->complete = req->base.complete;
239    req->base.complete = complete;
240
241    return cryptd_enqueue_request(queue, &req->base);
242}
243
244static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
245{
246    return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
247}
248
249static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
250{
251    return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
252}
253
254static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
255{
256    struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
257    struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
258    struct crypto_spawn *spawn = &ictx->spawn;
259    struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
260    struct crypto_blkcipher *cipher;
261
262    cipher = crypto_spawn_blkcipher(spawn);
263    if (IS_ERR(cipher))
264        return PTR_ERR(cipher);
265
266    ctx->child = cipher;
267    tfm->crt_ablkcipher.reqsize =
268        sizeof(struct cryptd_blkcipher_request_ctx);
269    return 0;
270}
271
272static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
273{
274    struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
275
276    crypto_free_blkcipher(ctx->child);
277}
278
279static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
280                   unsigned int tail)
281{
282    char *p;
283    struct crypto_instance *inst;
284    int err;
285
286    p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
287    if (!p)
288        return ERR_PTR(-ENOMEM);
289
290    inst = (void *)(p + head);
291
292    err = -ENAMETOOLONG;
293    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
294             "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
295        goto out_free_inst;
296
297    memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
298
299    inst->alg.cra_priority = alg->cra_priority + 50;
300    inst->alg.cra_blocksize = alg->cra_blocksize;
301    inst->alg.cra_alignmask = alg->cra_alignmask;
302
303out:
304    return p;
305
306out_free_inst:
307    kfree(p);
308    p = ERR_PTR(err);
309    goto out;
310}
311
312static int cryptd_create_blkcipher(struct crypto_template *tmpl,
313                   struct rtattr **tb,
314                   struct cryptd_queue *queue)
315{
316    struct cryptd_instance_ctx *ctx;
317    struct crypto_instance *inst;
318    struct crypto_alg *alg;
319    int err;
320
321    alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
322                  CRYPTO_ALG_TYPE_MASK);
323    if (IS_ERR(alg))
324        return PTR_ERR(alg);
325
326    inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
327    err = PTR_ERR(inst);
328    if (IS_ERR(inst))
329        goto out_put_alg;
330
331    ctx = crypto_instance_ctx(inst);
332    ctx->queue = queue;
333
334    err = crypto_init_spawn(&ctx->spawn, alg, inst,
335                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
336    if (err)
337        goto out_free_inst;
338
339    inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
340    inst->alg.cra_type = &crypto_ablkcipher_type;
341
342    inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
343    inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
344    inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
345
346    inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
347
348    inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
349
350    inst->alg.cra_init = cryptd_blkcipher_init_tfm;
351    inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
352
353    inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
354    inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
355    inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
356
357    err = crypto_register_instance(tmpl, inst);
358    if (err) {
359        crypto_drop_spawn(&ctx->spawn);
360out_free_inst:
361        kfree(inst);
362    }
363
364out_put_alg:
365    crypto_mod_put(alg);
366    return err;
367}
368
369static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
370{
371    struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
372    struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
373    struct crypto_shash_spawn *spawn = &ictx->spawn;
374    struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
375    struct crypto_shash *hash;
376
377    hash = crypto_spawn_shash(spawn);
378    if (IS_ERR(hash))
379        return PTR_ERR(hash);
380
381    ctx->child = hash;
382    crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
383                 sizeof(struct cryptd_hash_request_ctx) +
384                 crypto_shash_descsize(hash));
385    return 0;
386}
387
388static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
389{
390    struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
391
392    crypto_free_shash(ctx->child);
393}
394
395static int cryptd_hash_setkey(struct crypto_ahash *parent,
396                   const u8 *key, unsigned int keylen)
397{
398    struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent);
399    struct crypto_shash *child = ctx->child;
400    int err;
401
402    crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
403    crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
404                      CRYPTO_TFM_REQ_MASK);
405    err = crypto_shash_setkey(child, key, keylen);
406    crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
407                       CRYPTO_TFM_RES_MASK);
408    return err;
409}
410
411static int cryptd_hash_enqueue(struct ahash_request *req,
412                crypto_completion_t complete)
413{
414    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
415    struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
416    struct cryptd_queue *queue =
417        cryptd_get_queue(crypto_ahash_tfm(tfm));
418
419    rctx->complete = req->base.complete;
420    req->base.complete = complete;
421
422    return cryptd_enqueue_request(queue, &req->base);
423}
424
425static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
426{
427    struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
428    struct crypto_shash *child = ctx->child;
429    struct ahash_request *req = ahash_request_cast(req_async);
430    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
431    struct shash_desc *desc = &rctx->desc;
432
433    if (unlikely(err == -EINPROGRESS))
434        goto out;
435
436    desc->tfm = child;
437    desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
438
439    err = crypto_shash_init(desc);
440
441    req->base.complete = rctx->complete;
442
443out:
444    local_bh_disable();
445    rctx->complete(&req->base, err);
446    local_bh_enable();
447}
448
449static int cryptd_hash_init_enqueue(struct ahash_request *req)
450{
451    return cryptd_hash_enqueue(req, cryptd_hash_init);
452}
453
454static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
455{
456    struct ahash_request *req = ahash_request_cast(req_async);
457    struct cryptd_hash_request_ctx *rctx;
458
459    rctx = ahash_request_ctx(req);
460
461    if (unlikely(err == -EINPROGRESS))
462        goto out;
463
464    err = shash_ahash_update(req, &rctx->desc);
465
466    req->base.complete = rctx->complete;
467
468out:
469    local_bh_disable();
470    rctx->complete(&req->base, err);
471    local_bh_enable();
472}
473
474static int cryptd_hash_update_enqueue(struct ahash_request *req)
475{
476    return cryptd_hash_enqueue(req, cryptd_hash_update);
477}
478
479static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
480{
481    struct ahash_request *req = ahash_request_cast(req_async);
482    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
483
484    if (unlikely(err == -EINPROGRESS))
485        goto out;
486
487    err = crypto_shash_final(&rctx->desc, req->result);
488
489    req->base.complete = rctx->complete;
490
491out:
492    local_bh_disable();
493    rctx->complete(&req->base, err);
494    local_bh_enable();
495}
496
497static int cryptd_hash_final_enqueue(struct ahash_request *req)
498{
499    return cryptd_hash_enqueue(req, cryptd_hash_final);
500}
501
502static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
503{
504    struct ahash_request *req = ahash_request_cast(req_async);
505    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
506
507    if (unlikely(err == -EINPROGRESS))
508        goto out;
509
510    err = shash_ahash_finup(req, &rctx->desc);
511
512    req->base.complete = rctx->complete;
513
514out:
515    local_bh_disable();
516    rctx->complete(&req->base, err);
517    local_bh_enable();
518}
519
520static int cryptd_hash_finup_enqueue(struct ahash_request *req)
521{
522    return cryptd_hash_enqueue(req, cryptd_hash_finup);
523}
524
525static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
526{
527    struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
528    struct crypto_shash *child = ctx->child;
529    struct ahash_request *req = ahash_request_cast(req_async);
530    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
531    struct shash_desc *desc = &rctx->desc;
532
533    if (unlikely(err == -EINPROGRESS))
534        goto out;
535
536    desc->tfm = child;
537    desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
538
539    err = shash_ahash_digest(req, desc);
540
541    req->base.complete = rctx->complete;
542
543out:
544    local_bh_disable();
545    rctx->complete(&req->base, err);
546    local_bh_enable();
547}
548
549static int cryptd_hash_digest_enqueue(struct ahash_request *req)
550{
551    return cryptd_hash_enqueue(req, cryptd_hash_digest);
552}
553
554static int cryptd_hash_export(struct ahash_request *req, void *out)
555{
556    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
557
558    return crypto_shash_export(&rctx->desc, out);
559}
560
561static int cryptd_hash_import(struct ahash_request *req, const void *in)
562{
563    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
564
565    return crypto_shash_import(&rctx->desc, in);
566}
567
568static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
569                  struct cryptd_queue *queue)
570{
571    struct hashd_instance_ctx *ctx;
572    struct ahash_instance *inst;
573    struct shash_alg *salg;
574    struct crypto_alg *alg;
575    int err;
576
577    salg = shash_attr_alg(tb[1], 0, 0);
578    if (IS_ERR(salg))
579        return PTR_ERR(salg);
580
581    alg = &salg->base;
582    inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
583                     sizeof(*ctx));
584    err = PTR_ERR(inst);
585    if (IS_ERR(inst))
586        goto out_put_alg;
587
588    ctx = ahash_instance_ctx(inst);
589    ctx->queue = queue;
590
591    err = crypto_init_shash_spawn(&ctx->spawn, salg,
592                      ahash_crypto_instance(inst));
593    if (err)
594        goto out_free_inst;
595
596    inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
597
598    inst->alg.halg.digestsize = salg->digestsize;
599    inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
600
601    inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
602    inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
603
604    inst->alg.init = cryptd_hash_init_enqueue;
605    inst->alg.update = cryptd_hash_update_enqueue;
606    inst->alg.final = cryptd_hash_final_enqueue;
607    inst->alg.finup = cryptd_hash_finup_enqueue;
608    inst->alg.export = cryptd_hash_export;
609    inst->alg.import = cryptd_hash_import;
610    inst->alg.setkey = cryptd_hash_setkey;
611    inst->alg.digest = cryptd_hash_digest_enqueue;
612
613    err = ahash_register_instance(tmpl, inst);
614    if (err) {
615        crypto_drop_shash(&ctx->spawn);
616out_free_inst:
617        kfree(inst);
618    }
619
620out_put_alg:
621    crypto_mod_put(alg);
622    return err;
623}
624
625static void cryptd_aead_crypt(struct aead_request *req,
626            struct crypto_aead *child,
627            int err,
628            int (*crypt)(struct aead_request *req))
629{
630    struct cryptd_aead_request_ctx *rctx;
631    rctx = aead_request_ctx(req);
632
633    if (unlikely(err == -EINPROGRESS))
634        goto out;
635    aead_request_set_tfm(req, child);
636    err = crypt( req );
637    req->base.complete = rctx->complete;
638out:
639    local_bh_disable();
640    rctx->complete(&req->base, err);
641    local_bh_enable();
642}
643
644static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
645{
646    struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
647    struct crypto_aead *child = ctx->child;
648    struct aead_request *req;
649
650    req = container_of(areq, struct aead_request, base);
651    cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
652}
653
654static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
655{
656    struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
657    struct crypto_aead *child = ctx->child;
658    struct aead_request *req;
659
660    req = container_of(areq, struct aead_request, base);
661    cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
662}
663
664static int cryptd_aead_enqueue(struct aead_request *req,
665                    crypto_completion_t complete)
666{
667    struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
668    struct crypto_aead *tfm = crypto_aead_reqtfm(req);
669    struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
670
671    rctx->complete = req->base.complete;
672    req->base.complete = complete;
673    return cryptd_enqueue_request(queue, &req->base);
674}
675
676static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
677{
678    return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
679}
680
681static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
682{
683    return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
684}
685
686static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
687{
688    struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
689    struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
690    struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
691    struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
692    struct crypto_aead *cipher;
693
694    cipher = crypto_spawn_aead(spawn);
695    if (IS_ERR(cipher))
696        return PTR_ERR(cipher);
697
698    crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
699    ctx->child = cipher;
700    tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
701    return 0;
702}
703
704static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
705{
706    struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
707    crypto_free_aead(ctx->child);
708}
709
710static int cryptd_create_aead(struct crypto_template *tmpl,
711                      struct rtattr **tb,
712                  struct cryptd_queue *queue)
713{
714    struct aead_instance_ctx *ctx;
715    struct crypto_instance *inst;
716    struct crypto_alg *alg;
717    int err;
718
719    alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD,
720                CRYPTO_ALG_TYPE_MASK);
721        if (IS_ERR(alg))
722        return PTR_ERR(alg);
723
724    inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
725    err = PTR_ERR(inst);
726    if (IS_ERR(inst))
727        goto out_put_alg;
728
729    ctx = crypto_instance_ctx(inst);
730    ctx->queue = queue;
731
732    err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
733            CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
734    if (err)
735        goto out_free_inst;
736
737    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
738    inst->alg.cra_type = alg->cra_type;
739    inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
740    inst->alg.cra_init = cryptd_aead_init_tfm;
741    inst->alg.cra_exit = cryptd_aead_exit_tfm;
742    inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
743    inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
744    inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
745    inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
746    inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
747    inst->alg.cra_aead.encrypt = cryptd_aead_encrypt_enqueue;
748    inst->alg.cra_aead.decrypt = cryptd_aead_decrypt_enqueue;
749    inst->alg.cra_aead.givencrypt = alg->cra_aead.givencrypt;
750    inst->alg.cra_aead.givdecrypt = alg->cra_aead.givdecrypt;
751
752    err = crypto_register_instance(tmpl, inst);
753    if (err) {
754        crypto_drop_spawn(&ctx->aead_spawn.base);
755out_free_inst:
756        kfree(inst);
757    }
758out_put_alg:
759    crypto_mod_put(alg);
760    return err;
761}
762
763static struct cryptd_queue queue;
764
765static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
766{
767    struct crypto_attr_type *algt;
768
769    algt = crypto_get_attr_type(tb);
770    if (IS_ERR(algt))
771        return PTR_ERR(algt);
772
773    switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
774    case CRYPTO_ALG_TYPE_BLKCIPHER:
775        return cryptd_create_blkcipher(tmpl, tb, &queue);
776    case CRYPTO_ALG_TYPE_DIGEST:
777        return cryptd_create_hash(tmpl, tb, &queue);
778    case CRYPTO_ALG_TYPE_AEAD:
779        return cryptd_create_aead(tmpl, tb, &queue);
780    }
781
782    return -EINVAL;
783}
784
785static void cryptd_free(struct crypto_instance *inst)
786{
787    struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
788    struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
789    struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
790
791    switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
792    case CRYPTO_ALG_TYPE_AHASH:
793        crypto_drop_shash(&hctx->spawn);
794        kfree(ahash_instance(inst));
795        return;
796    case CRYPTO_ALG_TYPE_AEAD:
797        crypto_drop_spawn(&aead_ctx->aead_spawn.base);
798        kfree(inst);
799        return;
800    default:
801        crypto_drop_spawn(&ctx->spawn);
802        kfree(inst);
803    }
804}
805
806static struct crypto_template cryptd_tmpl = {
807    .name = "cryptd",
808    .create = cryptd_create,
809    .free = cryptd_free,
810    .module = THIS_MODULE,
811};
812
813struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
814                          u32 type, u32 mask)
815{
816    char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
817    struct crypto_tfm *tfm;
818
819    if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
820             "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
821        return ERR_PTR(-EINVAL);
822    type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
823    type |= CRYPTO_ALG_TYPE_BLKCIPHER;
824    mask &= ~CRYPTO_ALG_TYPE_MASK;
825    mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
826    tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
827    if (IS_ERR(tfm))
828        return ERR_CAST(tfm);
829    if (tfm->__crt_alg->cra_module != THIS_MODULE) {
830        crypto_free_tfm(tfm);
831        return ERR_PTR(-EINVAL);
832    }
833
834    return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
835}
836EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
837
838struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
839{
840    struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
841    return ctx->child;
842}
843EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
844
845void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
846{
847    crypto_free_ablkcipher(&tfm->base);
848}
849EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
850
851struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
852                    u32 type, u32 mask)
853{
854    char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
855    struct crypto_ahash *tfm;
856
857    if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
858             "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
859        return ERR_PTR(-EINVAL);
860    tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
861    if (IS_ERR(tfm))
862        return ERR_CAST(tfm);
863    if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
864        crypto_free_ahash(tfm);
865        return ERR_PTR(-EINVAL);
866    }
867
868    return __cryptd_ahash_cast(tfm);
869}
870EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
871
872struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
873{
874    struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
875
876    return ctx->child;
877}
878EXPORT_SYMBOL_GPL(cryptd_ahash_child);
879
880struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
881{
882    struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
883    return &rctx->desc;
884}
885EXPORT_SYMBOL_GPL(cryptd_shash_desc);
886
887void cryptd_free_ahash(struct cryptd_ahash *tfm)
888{
889    crypto_free_ahash(&tfm->base);
890}
891EXPORT_SYMBOL_GPL(cryptd_free_ahash);
892
893struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
894                          u32 type, u32 mask)
895{
896    char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
897    struct crypto_aead *tfm;
898
899    if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
900             "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
901        return ERR_PTR(-EINVAL);
902    tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
903    if (IS_ERR(tfm))
904        return ERR_CAST(tfm);
905    if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
906        crypto_free_aead(tfm);
907        return ERR_PTR(-EINVAL);
908    }
909    return __cryptd_aead_cast(tfm);
910}
911EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
912
913struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
914{
915    struct cryptd_aead_ctx *ctx;
916    ctx = crypto_aead_ctx(&tfm->base);
917    return ctx->child;
918}
919EXPORT_SYMBOL_GPL(cryptd_aead_child);
920
921void cryptd_free_aead(struct cryptd_aead *tfm)
922{
923    crypto_free_aead(&tfm->base);
924}
925EXPORT_SYMBOL_GPL(cryptd_free_aead);
926
927static int __init cryptd_init(void)
928{
929    int err;
930
931    err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
932    if (err)
933        return err;
934
935    err = crypto_register_template(&cryptd_tmpl);
936    if (err)
937        cryptd_fini_queue(&queue);
938
939    return err;
940}
941
942static void __exit cryptd_exit(void)
943{
944    cryptd_fini_queue(&queue);
945    crypto_unregister_template(&cryptd_tmpl);
946}
947
948module_init(cryptd_init);
949module_exit(cryptd_exit);
950
951MODULE_LICENSE("GPL");
952MODULE_DESCRIPTION("Software async crypto daemon");
953

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