Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / crypto / cryptd.c
index 704c141..7bdd61b 100644 (file)
@@ -3,6 +3,13 @@
  *
  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  *
+ * Added AEAD support to cryptd.
+ *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
+ *             Adrian Hoban <adrian.hoban@intel.com>
+ *             Gabriele Paoloni <gabriele.paoloni@intel.com>
+ *             Aidan O'Mahony (aidan.o.mahony@intel.com)
+ *    Copyright (c) 2010, Intel Corporation.
+ *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation; either version 2 of the License, or (at your option)
@@ -12,6 +19,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/internal/hash.h>
+#include <crypto/internal/aead.h>
 #include <crypto/cryptd.h>
 #include <crypto/crypto_wq.h>
 #include <linux/err.h>
@@ -31,7 +39,7 @@ struct cryptd_cpu_queue {
 };
 
 struct cryptd_queue {
-       struct cryptd_cpu_queue *cpu_queue;
+       struct cryptd_cpu_queue __percpu *cpu_queue;
 };
 
 struct cryptd_instance_ctx {
@@ -44,6 +52,11 @@ struct hashd_instance_ctx {
        struct cryptd_queue *queue;
 };
 
+struct aead_instance_ctx {
+       struct crypto_aead_spawn aead_spawn;
+       struct cryptd_queue *queue;
+};
+
 struct cryptd_blkcipher_ctx {
        struct crypto_blkcipher *child;
 };
@@ -61,6 +74,14 @@ struct cryptd_hash_request_ctx {
        struct shash_desc desc;
 };
 
+struct cryptd_aead_ctx {
+       struct crypto_aead *child;
+};
+
+struct cryptd_aead_request_ctx {
+       crypto_completion_t complete;
+};
+
 static void cryptd_queue_worker(struct work_struct *work);
 
 static int cryptd_init_queue(struct cryptd_queue *queue,
@@ -116,13 +137,18 @@ static void cryptd_queue_worker(struct work_struct *work)
        struct crypto_async_request *req, *backlog;
 
        cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
-       /* Only handle one request at a time to avoid hogging crypto
-        * workqueue. preempt_disable/enable is used to prevent
-        * being preempted by cryptd_enqueue_request() */
+       /*
+        * Only handle one request at a time to avoid hogging crypto workqueue.
+        * preempt_disable/enable is used to prevent being preempted by
+        * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
+        * cryptd_enqueue_request() being accessed from software interrupts.
+        */
+       local_bh_disable();
        preempt_disable();
        backlog = crypto_get_backlog(&cpu_queue->queue);
        req = crypto_dequeue_request(&cpu_queue->queue);
        preempt_enable();
+       local_bh_enable();
 
        if (!req)
                return;
@@ -601,6 +627,144 @@ out_put_alg:
        return err;
 }
 
+static void cryptd_aead_crypt(struct aead_request *req,
+                       struct crypto_aead *child,
+                       int err,
+                       int (*crypt)(struct aead_request *req))
+{
+       struct cryptd_aead_request_ctx *rctx;
+       rctx = aead_request_ctx(req);
+
+       if (unlikely(err == -EINPROGRESS))
+               goto out;
+       aead_request_set_tfm(req, child);
+       err = crypt( req );
+       req->base.complete = rctx->complete;
+out:
+       local_bh_disable();
+       rctx->complete(&req->base, err);
+       local_bh_enable();
+}
+
+static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
+{
+       struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
+       struct crypto_aead *child = ctx->child;
+       struct aead_request *req;
+
+       req = container_of(areq, struct aead_request, base);
+       cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
+}
+
+static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
+{
+       struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
+       struct crypto_aead *child = ctx->child;
+       struct aead_request *req;
+
+       req = container_of(areq, struct aead_request, base);
+       cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
+}
+
+static int cryptd_aead_enqueue(struct aead_request *req,
+                                   crypto_completion_t complete)
+{
+       struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
+       struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+       struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
+
+       rctx->complete = req->base.complete;
+       req->base.complete = complete;
+       return cryptd_enqueue_request(queue, &req->base);
+}
+
+static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
+{
+       return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
+}
+
+static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
+{
+       return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
+}
+
+static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
+       struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
+       struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
+       struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
+       struct crypto_aead *cipher;
+
+       cipher = crypto_spawn_aead(spawn);
+       if (IS_ERR(cipher))
+               return PTR_ERR(cipher);
+
+       crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
+       ctx->child = cipher;
+       tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
+       return 0;
+}
+
+static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
+       crypto_free_aead(ctx->child);
+}
+
+static int cryptd_create_aead(struct crypto_template *tmpl,
+                             struct rtattr **tb,
+                             struct cryptd_queue *queue)
+{
+       struct aead_instance_ctx *ctx;
+       struct crypto_instance *inst;
+       struct crypto_alg *alg;
+       int err;
+
+       alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD,
+                               CRYPTO_ALG_TYPE_MASK);
+        if (IS_ERR(alg))
+               return PTR_ERR(alg);
+
+       inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
+       err = PTR_ERR(inst);
+       if (IS_ERR(inst))
+               goto out_put_alg;
+
+       ctx = crypto_instance_ctx(inst);
+       ctx->queue = queue;
+
+       err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
+                       CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
+       if (err)
+               goto out_free_inst;
+
+       inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
+       inst->alg.cra_type = alg->cra_type;
+       inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
+       inst->alg.cra_init = cryptd_aead_init_tfm;
+       inst->alg.cra_exit = cryptd_aead_exit_tfm;
+       inst->alg.cra_aead.setkey      = alg->cra_aead.setkey;
+       inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
+       inst->alg.cra_aead.geniv       = alg->cra_aead.geniv;
+       inst->alg.cra_aead.ivsize      = alg->cra_aead.ivsize;
+       inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
+       inst->alg.cra_aead.encrypt     = cryptd_aead_encrypt_enqueue;
+       inst->alg.cra_aead.decrypt     = cryptd_aead_decrypt_enqueue;
+       inst->alg.cra_aead.givencrypt  = alg->cra_aead.givencrypt;
+       inst->alg.cra_aead.givdecrypt  = alg->cra_aead.givdecrypt;
+
+       err = crypto_register_instance(tmpl, inst);
+       if (err) {
+               crypto_drop_spawn(&ctx->aead_spawn.base);
+out_free_inst:
+               kfree(inst);
+       }
+out_put_alg:
+       crypto_mod_put(alg);
+       return err;
+}
+
 static struct cryptd_queue queue;
 
 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
@@ -616,6 +780,8 @@ static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
                return cryptd_create_blkcipher(tmpl, tb, &queue);
        case CRYPTO_ALG_TYPE_DIGEST:
                return cryptd_create_hash(tmpl, tb, &queue);
+       case CRYPTO_ALG_TYPE_AEAD:
+               return cryptd_create_aead(tmpl, tb, &queue);
        }
 
        return -EINVAL;
@@ -625,16 +791,21 @@ static void cryptd_free(struct crypto_instance *inst)
 {
        struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
        struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
+       struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 
        switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
        case CRYPTO_ALG_TYPE_AHASH:
                crypto_drop_shash(&hctx->spawn);
                kfree(ahash_instance(inst));
                return;
+       case CRYPTO_ALG_TYPE_AEAD:
+               crypto_drop_spawn(&aead_ctx->aead_spawn.base);
+               kfree(inst);
+               return;
+       default:
+               crypto_drop_spawn(&ctx->spawn);
+               kfree(inst);
        }
-
-       crypto_drop_spawn(&ctx->spawn);
-       kfree(inst);
 }
 
 static struct crypto_template cryptd_tmpl = {
@@ -724,6 +895,40 @@ void cryptd_free_ahash(struct cryptd_ahash *tfm)
 }
 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 
+struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
+                                                 u32 type, u32 mask)
+{
+       char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+       struct crypto_aead *tfm;
+
+       if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+                    "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+               return ERR_PTR(-EINVAL);
+       tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
+       if (IS_ERR(tfm))
+               return ERR_CAST(tfm);
+       if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
+               crypto_free_aead(tfm);
+               return ERR_PTR(-EINVAL);
+       }
+       return __cryptd_aead_cast(tfm);
+}
+EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
+
+struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
+{
+       struct cryptd_aead_ctx *ctx;
+       ctx = crypto_aead_ctx(&tfm->base);
+       return ctx->child;
+}
+EXPORT_SYMBOL_GPL(cryptd_aead_child);
+
+void cryptd_free_aead(struct cryptd_aead *tfm)
+{
+       crypto_free_aead(&tfm->base);
+}
+EXPORT_SYMBOL_GPL(cryptd_free_aead);
+
 static int __init cryptd_init(void)
 {
        int err;
@@ -745,7 +950,7 @@ static void __exit cryptd_exit(void)
        crypto_unregister_template(&cryptd_tmpl);
 }
 
-module_init(cryptd_init);
+subsys_initcall(cryptd_init);
 module_exit(cryptd_exit);
 
 MODULE_LICENSE("GPL");