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path: root/drivers/staging/dst/crypto.c
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Diffstat (limited to 'drivers/staging/dst/crypto.c')
-rw-r--r--drivers/staging/dst/crypto.c733
1 files changed, 0 insertions, 733 deletions
diff --git a/drivers/staging/dst/crypto.c b/drivers/staging/dst/crypto.c
deleted file mode 100644
index 351295c97a4..00000000000
--- a/drivers/staging/dst/crypto.c
+++ /dev/null
@@ -1,733 +0,0 @@
-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * 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) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bio.h>
-#include <linux/crypto.h>
-#include <linux/dst.h>
-#include <linux/kernel.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-/*
- * Tricky bastard, but IV can be more complex with time...
- */
-static inline u64 dst_gen_iv(struct dst_trans *t)
-{
- return t->gen;
-}
-
-/*
- * Crypto machinery: hash/cipher support for the given crypto controls.
- */
-static struct crypto_hash *dst_init_hash(struct dst_crypto_ctl *ctl, u8 *key)
-{
- int err;
- struct crypto_hash *hash;
-
- hash = crypto_alloc_hash(ctl->hash_algo, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(hash)) {
- err = PTR_ERR(hash);
- dprintk("%s: failed to allocate hash '%s', err: %d.\n",
- __func__, ctl->hash_algo, err);
- goto err_out_exit;
- }
-
- ctl->crypto_attached_size = crypto_hash_digestsize(hash);
-
- if (!ctl->hash_keysize)
- return hash;
-
- err = crypto_hash_setkey(hash, key, ctl->hash_keysize);
- if (err) {
- dprintk("%s: failed to set key for hash '%s', err: %d.\n",
- __func__, ctl->hash_algo, err);
- goto err_out_free;
- }
-
- return hash;
-
-err_out_free:
- crypto_free_hash(hash);
-err_out_exit:
- return ERR_PTR(err);
-}
-
-static struct crypto_ablkcipher *dst_init_cipher(struct dst_crypto_ctl *ctl,
- u8 *key)
-{
- int err = -EINVAL;
- struct crypto_ablkcipher *cipher;
-
- if (!ctl->cipher_keysize)
- goto err_out_exit;
-
- cipher = crypto_alloc_ablkcipher(ctl->cipher_algo, 0, 0);
- if (IS_ERR(cipher)) {
- err = PTR_ERR(cipher);
- dprintk("%s: failed to allocate cipher '%s', err: %d.\n",
- __func__, ctl->cipher_algo, err);
- goto err_out_exit;
- }
-
- crypto_ablkcipher_clear_flags(cipher, ~0);
-
- err = crypto_ablkcipher_setkey(cipher, key, ctl->cipher_keysize);
- if (err) {
- dprintk("%s: failed to set key for cipher '%s', err: %d.\n",
- __func__, ctl->cipher_algo, err);
- goto err_out_free;
- }
-
- return cipher;
-
-err_out_free:
- crypto_free_ablkcipher(cipher);
-err_out_exit:
- return ERR_PTR(err);
-}
-
-/*
- * Crypto engine has a pool of pages to encrypt data into before sending
- * it over the network. This pool is freed/allocated here.
- */
-static void dst_crypto_pages_free(struct dst_crypto_engine *e)
-{
- unsigned int i;
-
- for (i = 0; i < e->page_num; ++i)
- __free_page(e->pages[i]);
- kfree(e->pages);
-}
-
-static int dst_crypto_pages_alloc(struct dst_crypto_engine *e, int num)
-{
- int i;
-
- e->pages = kmalloc(num * sizeof(struct page **), GFP_KERNEL);
- if (!e->pages)
- return -ENOMEM;
-
- for (i = 0; i < num; ++i) {
- e->pages[i] = alloc_page(GFP_KERNEL);
- if (!e->pages[i])
- goto err_out_free_pages;
- }
-
- e->page_num = num;
- return 0;
-
-err_out_free_pages:
- while (--i >= 0)
- __free_page(e->pages[i]);
-
- kfree(e->pages);
- return -ENOMEM;
-}
-
-/*
- * Initialize crypto engine for given node.
- * Setup cipher/hash, keys, pool of threads and private data.
- */
-static int dst_crypto_engine_init(struct dst_crypto_engine *e,
- struct dst_node *n)
-{
- int err;
- struct dst_crypto_ctl *ctl = &n->crypto;
-
- err = dst_crypto_pages_alloc(e, n->max_pages);
- if (err)
- goto err_out_exit;
-
- e->size = PAGE_SIZE;
- e->data = kmalloc(e->size, GFP_KERNEL);
- if (!e->data) {
- err = -ENOMEM;
- goto err_out_free_pages;
- }
-
- if (ctl->hash_algo[0]) {
- e->hash = dst_init_hash(ctl, n->hash_key);
- if (IS_ERR(e->hash)) {
- err = PTR_ERR(e->hash);
- e->hash = NULL;
- goto err_out_free;
- }
- }
-
- if (ctl->cipher_algo[0]) {
- e->cipher = dst_init_cipher(ctl, n->cipher_key);
- if (IS_ERR(e->cipher)) {
- err = PTR_ERR(e->cipher);
- e->cipher = NULL;
- goto err_out_free_hash;
- }
- }
-
- return 0;
-
-err_out_free_hash:
- crypto_free_hash(e->hash);
-err_out_free:
- kfree(e->data);
-err_out_free_pages:
- dst_crypto_pages_free(e);
-err_out_exit:
- return err;
-}
-
-static void dst_crypto_engine_exit(struct dst_crypto_engine *e)
-{
- if (e->hash)
- crypto_free_hash(e->hash);
- if (e->cipher)
- crypto_free_ablkcipher(e->cipher);
- dst_crypto_pages_free(e);
- kfree(e->data);
-}
-
-/*
- * Waiting for cipher processing to be completed.
- */
-struct dst_crypto_completion {
- struct completion complete;
- int error;
-};
-
-static void dst_crypto_complete(struct crypto_async_request *req, int err)
-{
- struct dst_crypto_completion *c = req->data;
-
- if (err == -EINPROGRESS)
- return;
-
- dprintk("%s: req: %p, err: %d.\n", __func__, req, err);
- c->error = err;
- complete(&c->complete);
-}
-
-static int dst_crypto_process(struct ablkcipher_request *req,
- struct scatterlist *sg_dst, struct scatterlist *sg_src,
- void *iv, int enc, unsigned long timeout)
-{
- struct dst_crypto_completion c;
- int err;
-
- init_completion(&c.complete);
- c.error = -EINPROGRESS;
-
- ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
- dst_crypto_complete, &c);
-
- ablkcipher_request_set_crypt(req, sg_src, sg_dst, sg_src->length, iv);
-
- if (enc)
- err = crypto_ablkcipher_encrypt(req);
- else
- err = crypto_ablkcipher_decrypt(req);
-
- switch (err) {
- case -EINPROGRESS:
- case -EBUSY:
- err = wait_for_completion_interruptible_timeout(&c.complete,
- timeout);
- if (!err)
- err = -ETIMEDOUT;
- else
- err = c.error;
- break;
- default:
- break;
- }
-
- return err;
-}
-
-/*
- * DST uses generic iteration approach for data crypto processing.
- * Single block IO request is switched into array of scatterlists,
- * which are submitted to the crypto processing iterator.
- *
- * Input and output iterator initialization are different, since
- * in output case we can not encrypt data in-place and need a
- * temporary storage, which is then being sent to the remote peer.
- */
-static int dst_trans_iter_out(struct bio *bio, struct dst_crypto_engine *e,
- int (*iterator) (struct dst_crypto_engine *e,
- struct scatterlist *dst,
- struct scatterlist *src))
-{
- struct bio_vec *bv;
- int err, i;
-
- sg_init_table(e->src, bio->bi_vcnt);
- sg_init_table(e->dst, bio->bi_vcnt);
-
- bio_for_each_segment(bv, bio, i) {
- sg_set_page(&e->src[i], bv->bv_page, bv->bv_len, bv->bv_offset);
- sg_set_page(&e->dst[i], e->pages[i], bv->bv_len, bv->bv_offset);
-
- err = iterator(e, &e->dst[i], &e->src[i]);
- if (err)
- return err;
- }
-
- return 0;
-}
-
-static int dst_trans_iter_in(struct bio *bio, struct dst_crypto_engine *e,
- int (*iterator) (struct dst_crypto_engine *e,
- struct scatterlist *dst,
- struct scatterlist *src))
-{
- struct bio_vec *bv;
- int err, i;
-
- sg_init_table(e->src, bio->bi_vcnt);
- sg_init_table(e->dst, bio->bi_vcnt);
-
- bio_for_each_segment(bv, bio, i) {
- sg_set_page(&e->src[i], bv->bv_page, bv->bv_len, bv->bv_offset);
- sg_set_page(&e->dst[i], bv->bv_page, bv->bv_len, bv->bv_offset);
-
- err = iterator(e, &e->dst[i], &e->src[i]);
- if (err)
- return err;
- }
-
- return 0;
-}
-
-static int dst_crypt_iterator(struct dst_crypto_engine *e,
- struct scatterlist *sg_dst, struct scatterlist *sg_src)
-{
- struct ablkcipher_request *req = e->data;
- u8 iv[32];
-
- memset(iv, 0, sizeof(iv));
-
- memcpy(iv, &e->iv, sizeof(e->iv));
-
- return dst_crypto_process(req, sg_dst, sg_src, iv, e->enc, e->timeout);
-}
-
-static int dst_crypt(struct dst_crypto_engine *e, struct bio *bio)
-{
- struct ablkcipher_request *req = e->data;
-
- memset(req, 0, sizeof(struct ablkcipher_request));
- ablkcipher_request_set_tfm(req, e->cipher);
-
- if (e->enc)
- return dst_trans_iter_out(bio, e, dst_crypt_iterator);
- else
- return dst_trans_iter_in(bio, e, dst_crypt_iterator);
-}
-
-static int dst_hash_iterator(struct dst_crypto_engine *e,
- struct scatterlist *sg_dst, struct scatterlist *sg_src)
-{
- return crypto_hash_update(e->data, sg_src, sg_src->length);
-}
-
-static int dst_hash(struct dst_crypto_engine *e, struct bio *bio, void *dst)
-{
- struct hash_desc *desc = e->data;
- int err;
-
- desc->tfm = e->hash;
- desc->flags = 0;
-
- err = crypto_hash_init(desc);
- if (err)
- return err;
-
- err = dst_trans_iter_in(bio, e, dst_hash_iterator);
- if (err)
- return err;
-
- err = crypto_hash_final(desc, dst);
- if (err)
- return err;
-
- return 0;
-}
-
-/*
- * Initialize/cleanup a crypto thread. The only thing it should
- * do is to allocate a pool of pages as temporary storage.
- * And to setup cipher and/or hash.
- */
-static void *dst_crypto_thread_init(void *data)
-{
- struct dst_node *n = data;
- struct dst_crypto_engine *e;
- int err = -ENOMEM;
-
- e = kzalloc(sizeof(struct dst_crypto_engine), GFP_KERNEL);
- if (!e)
- goto err_out_exit;
- e->src = kcalloc(2 * n->max_pages, sizeof(struct scatterlist),
- GFP_KERNEL);
- if (!e->src)
- goto err_out_free;
-
- e->dst = e->src + n->max_pages;
-
- err = dst_crypto_engine_init(e, n);
- if (err)
- goto err_out_free_all;
-
- return e;
-
-err_out_free_all:
- kfree(e->src);
-err_out_free:
- kfree(e);
-err_out_exit:
- return ERR_PTR(err);
-}
-
-static void dst_crypto_thread_cleanup(void *private)
-{
- struct dst_crypto_engine *e = private;
-
- dst_crypto_engine_exit(e);
- kfree(e->src);
- kfree(e);
-}
-
-/*
- * Initialize crypto engine for given node: store keys, create pool
- * of threads, initialize each one.
- *
- * Each thread has unique ID, but 0 and 1 are reserved for receiving and
- * accepting threads (if export node), so IDs could start from 2, but starting
- * them from 10 allows easily understand what this thread is for.
- */
-int dst_node_crypto_init(struct dst_node *n, struct dst_crypto_ctl *ctl)
-{
- void *key = (ctl + 1);
- int err = -ENOMEM, i;
- char name[32];
-
- if (ctl->hash_keysize) {
- n->hash_key = kmalloc(ctl->hash_keysize, GFP_KERNEL);
- if (!n->hash_key)
- goto err_out_exit;
- memcpy(n->hash_key, key, ctl->hash_keysize);
- }
-
- if (ctl->cipher_keysize) {
- n->cipher_key = kmalloc(ctl->cipher_keysize, GFP_KERNEL);
- if (!n->cipher_key)
- goto err_out_free_hash;
- memcpy(n->cipher_key, key, ctl->cipher_keysize);
- }
- memcpy(&n->crypto, ctl, sizeof(struct dst_crypto_ctl));
-
- for (i = 0; i < ctl->thread_num; ++i) {
- snprintf(name, sizeof(name), "%s-crypto-%d", n->name, i);
- /* Unique ids... */
- err = thread_pool_add_worker(n->pool, name, i + 10,
- dst_crypto_thread_init, dst_crypto_thread_cleanup, n);
- if (err)
- goto err_out_free_threads;
- }
-
- return 0;
-
-err_out_free_threads:
- while (--i >= 0)
- thread_pool_del_worker_id(n->pool, i+10);
-
- if (ctl->cipher_keysize)
- kfree(n->cipher_key);
- ctl->cipher_keysize = 0;
-err_out_free_hash:
- if (ctl->hash_keysize)
- kfree(n->hash_key);
- ctl->hash_keysize = 0;
-err_out_exit:
- return err;
-}
-
-void dst_node_crypto_exit(struct dst_node *n)
-{
- struct dst_crypto_ctl *ctl = &n->crypto;
-
- if (ctl->cipher_algo[0] || ctl->hash_algo[0]) {
- kfree(n->hash_key);
- kfree(n->cipher_key);
- }
-}
-
-/*
- * Thrad pool setup callback. Just stores a transaction in private data.
- */
-static int dst_trans_crypto_setup(void *crypto_engine, void *trans)
-{
- struct dst_crypto_engine *e = crypto_engine;
-
- e->private = trans;
- return 0;
-}
-
-#if 0
-static void dst_dump_bio(struct bio *bio)
-{
- u8 *p;
- struct bio_vec *bv;
- int i;
-
- bio_for_each_segment(bv, bio, i) {
- dprintk("%s: %llu/%u: size: %u, offset: %u, data: ",
- __func__, bio->bi_sector, bio->bi_size,
- bv->bv_len, bv->bv_offset);
-
- p = kmap(bv->bv_page) + bv->bv_offset;
- for (i = 0; i < bv->bv_len; ++i)
- printk(KERN_DEBUG "%02x ", p[i]);
- kunmap(bv->bv_page);
- printk("\n");
- }
-}
-#endif
-
-/*
- * Encrypt/hash data and send it to the network.
- */
-static int dst_crypto_process_sending(struct dst_crypto_engine *e,
- struct bio *bio, u8 *hash)
-{
- int err;
-
- if (e->cipher) {
- err = dst_crypt(e, bio);
- if (err)
- goto err_out_exit;
- }
-
- if (e->hash) {
- err = dst_hash(e, bio, hash);
- if (err)
- goto err_out_exit;
-
-#ifdef CONFIG_DST_DEBUG
- {
- unsigned int i;
-
- /* dst_dump_bio(bio); */
-
- printk(KERN_DEBUG "%s: bio: %llu/%u, rw: %lu, hash: ",
- __func__, (u64)bio->bi_sector,
- bio->bi_size, bio_data_dir(bio));
- for (i = 0; i < crypto_hash_digestsize(e->hash); ++i)
- printk("%02x ", hash[i]);
- printk("\n");
- }
-#endif
- }
-
- return 0;
-
-err_out_exit:
- return err;
-}
-
-/*
- * Check if received data is valid. Decipher if it is.
- */
-static int dst_crypto_process_receiving(struct dst_crypto_engine *e,
- struct bio *bio, u8 *hash, u8 *recv_hash)
-{
- int err;
-
- if (e->hash) {
- int mismatch;
-
- err = dst_hash(e, bio, hash);
- if (err)
- goto err_out_exit;
-
- mismatch = !!memcmp(recv_hash, hash,
- crypto_hash_digestsize(e->hash));
-#ifdef CONFIG_DST_DEBUG
- /* dst_dump_bio(bio); */
-
- printk(KERN_DEBUG "%s: bio: %llu/%u, rw: %lu, hash mismatch: %d",
- __func__, (u64)bio->bi_sector, bio->bi_size,
- bio_data_dir(bio), mismatch);
- if (mismatch) {
- unsigned int i;
-
- printk(", recv/calc: ");
- for (i = 0; i < crypto_hash_digestsize(e->hash); ++i)
- printk("%02x/%02x ", recv_hash[i], hash[i]);
-
- }
- printk("\n");
-#endif
- err = -1;
- if (mismatch)
- goto err_out_exit;
- }
-
- if (e->cipher) {
- err = dst_crypt(e, bio);
- if (err)
- goto err_out_exit;
- }
-
- return 0;
-
-err_out_exit:
- return err;
-}
-
-/*
- * Thread pool callback to encrypt data and send it to the netowork.
- */
-static int dst_trans_crypto_action(void *crypto_engine, void *schedule_data)
-{
- struct dst_crypto_engine *e = crypto_engine;
- struct dst_trans *t = schedule_data;
- struct bio *bio = t->bio;
- int err;
-
- dprintk("%s: t: %p, gen: %llu, cipher: %p, hash: %p.\n",
- __func__, t, t->gen, e->cipher, e->hash);
-
- e->enc = t->enc;
- e->iv = dst_gen_iv(t);
-
- if (bio_data_dir(bio) == WRITE) {
- err = dst_crypto_process_sending(e, bio, t->cmd.hash);
- if (err)
- goto err_out_exit;
-
- if (e->hash) {
- t->cmd.csize = crypto_hash_digestsize(e->hash);
- t->cmd.size += t->cmd.csize;
- }
-
- return dst_trans_send(t);
- } else {
- u8 *hash = e->data + e->size/2;
-
- err = dst_crypto_process_receiving(e, bio, hash, t->cmd.hash);
- if (err)
- goto err_out_exit;
-
- dst_trans_remove(t);
- dst_trans_put(t);
- }
-
- return 0;
-
-err_out_exit:
- t->error = err;
- dst_trans_put(t);
- return err;
-}
-
-/*
- * Schedule crypto processing for given transaction.
- */
-int dst_trans_crypto(struct dst_trans *t)
-{
- struct dst_node *n = t->n;
- int err;
-
- err = thread_pool_schedule(n->pool,
- dst_trans_crypto_setup, dst_trans_crypto_action,
- t, MAX_SCHEDULE_TIMEOUT);
- if (err)
- goto err_out_exit;
-
- return 0;
-
-err_out_exit:
- dst_trans_put(t);
- return err;
-}
-
-/*
- * Crypto machinery for the export node.
- */
-static int dst_export_crypto_setup(void *crypto_engine, void *bio)
-{
- struct dst_crypto_engine *e = crypto_engine;
-
- e->private = bio;
- return 0;
-}
-
-static int dst_export_crypto_action(void *crypto_engine, void *schedule_data)
-{
- struct dst_crypto_engine *e = crypto_engine;
- struct bio *bio = schedule_data;
- struct dst_export_priv *p = bio->bi_private;
- int err;
-
- dprintk("%s: e: %p, data: %p, bio: %llu/%u, dir: %lu.\n",
- __func__, e, e->data, (u64)bio->bi_sector,
- bio->bi_size, bio_data_dir(bio));
-
- e->enc = (bio_data_dir(bio) == READ);
- e->iv = p->cmd.id;
-
- if (bio_data_dir(bio) == WRITE) {
- u8 *hash = e->data + e->size/2;
-
- err = dst_crypto_process_receiving(e, bio, hash, p->cmd.hash);
- if (err)
- goto err_out_exit;
-
- generic_make_request(bio);
- } else {
- err = dst_crypto_process_sending(e, bio, p->cmd.hash);
- if (err)
- goto err_out_exit;
-
- if (e->hash) {
- p->cmd.csize = crypto_hash_digestsize(e->hash);
- p->cmd.size += p->cmd.csize;
- }
-
- err = dst_export_send_bio(bio);
- }
- return 0;
-
-err_out_exit:
- bio_put(bio);
- return err;
-}
-
-int dst_export_crypto(struct dst_node *n, struct bio *bio)
-{
- int err;
-
- err = thread_pool_schedule(n->pool,
- dst_export_crypto_setup, dst_export_crypto_action,
- bio, MAX_SCHEDULE_TIMEOUT);
- if (err)
- goto err_out_exit;
-
- return 0;
-
-err_out_exit:
- bio_put(bio);
- return err;
-}