385e3f1a14
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
880 lines
19 KiB
C
880 lines
19 KiB
C
/*
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* 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/crypto.h>
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#include <linux/highmem.h>
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#include <linux/kthread.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include "netfs.h"
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static struct crypto_hash *pohmelfs_init_hash(struct pohmelfs_sb *psb)
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{
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int err;
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struct crypto_hash *hash;
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hash = crypto_alloc_hash(psb->hash_string, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(hash)) {
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err = PTR_ERR(hash);
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dprintk("%s: idx: %u: failed to allocate hash '%s', err: %d.\n",
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__func__, psb->idx, psb->hash_string, err);
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goto err_out_exit;
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}
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psb->crypto_attached_size = crypto_hash_digestsize(hash);
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if (!psb->hash_keysize)
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return hash;
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err = crypto_hash_setkey(hash, psb->hash_key, psb->hash_keysize);
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if (err) {
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dprintk("%s: idx: %u: failed to set key for hash '%s', err: %d.\n",
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__func__, psb->idx, psb->hash_string, err);
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goto err_out_free;
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}
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return hash;
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err_out_free:
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crypto_free_hash(hash);
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err_out_exit:
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return ERR_PTR(err);
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}
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static struct crypto_ablkcipher *pohmelfs_init_cipher(struct pohmelfs_sb *psb)
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{
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int err = -EINVAL;
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struct crypto_ablkcipher *cipher;
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if (!psb->cipher_keysize)
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goto err_out_exit;
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cipher = crypto_alloc_ablkcipher(psb->cipher_string, 0, 0);
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if (IS_ERR(cipher)) {
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err = PTR_ERR(cipher);
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dprintk("%s: idx: %u: failed to allocate cipher '%s', err: %d.\n",
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__func__, psb->idx, psb->cipher_string, err);
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goto err_out_exit;
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}
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crypto_ablkcipher_clear_flags(cipher, ~0);
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err = crypto_ablkcipher_setkey(cipher, psb->cipher_key, psb->cipher_keysize);
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if (err) {
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dprintk("%s: idx: %u: failed to set key for cipher '%s', err: %d.\n",
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__func__, psb->idx, psb->cipher_string, err);
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goto err_out_free;
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}
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return cipher;
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err_out_free:
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crypto_free_ablkcipher(cipher);
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err_out_exit:
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return ERR_PTR(err);
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}
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int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb)
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{
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int err;
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e->page_num = 0;
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e->size = PAGE_SIZE;
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e->data = kmalloc(e->size, GFP_KERNEL);
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if (!e->data) {
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err = -ENOMEM;
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goto err_out_exit;
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}
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if (psb->hash_string) {
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e->hash = pohmelfs_init_hash(psb);
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if (IS_ERR(e->hash)) {
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err = PTR_ERR(e->hash);
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e->hash = NULL;
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goto err_out_free;
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}
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}
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if (psb->cipher_string) {
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e->cipher = pohmelfs_init_cipher(psb);
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if (IS_ERR(e->cipher)) {
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err = PTR_ERR(e->cipher);
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e->cipher = NULL;
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goto err_out_free_hash;
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}
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}
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return 0;
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err_out_free_hash:
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crypto_free_hash(e->hash);
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err_out_free:
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kfree(e->data);
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err_out_exit:
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return err;
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}
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void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e)
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{
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if (e->hash)
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crypto_free_hash(e->hash);
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if (e->cipher)
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crypto_free_ablkcipher(e->cipher);
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kfree(e->data);
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}
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static void pohmelfs_crypto_complete(struct crypto_async_request *req, int err)
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{
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struct pohmelfs_crypto_completion *c = req->data;
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if (err == -EINPROGRESS)
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return;
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dprintk("%s: req: %p, err: %d.\n", __func__, req, err);
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c->error = err;
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complete(&c->complete);
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}
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static int pohmelfs_crypto_process(struct ablkcipher_request *req,
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struct scatterlist *sg_dst, struct scatterlist *sg_src,
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void *iv, int enc, unsigned long timeout)
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{
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struct pohmelfs_crypto_completion complete;
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int err;
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init_completion(&complete.complete);
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complete.error = -EINPROGRESS;
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ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
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pohmelfs_crypto_complete, &complete);
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ablkcipher_request_set_crypt(req, sg_src, sg_dst, sg_src->length, iv);
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if (enc)
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err = crypto_ablkcipher_encrypt(req);
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else
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err = crypto_ablkcipher_decrypt(req);
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switch (err) {
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case -EINPROGRESS:
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case -EBUSY:
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err = wait_for_completion_interruptible_timeout(&complete.complete,
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timeout);
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if (!err)
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err = -ETIMEDOUT;
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else
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err = complete.error;
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break;
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default:
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break;
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}
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return err;
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}
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int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 cmd_iv,
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void *data, struct page *page, unsigned int size)
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{
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int err;
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struct scatterlist sg;
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if (!e->cipher && !e->hash)
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return 0;
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dprintk("%s: eng: %p, iv: %llx, data: %p, page: %p/%lu, size: %u.\n",
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__func__, e, cmd_iv, data, page, (page)?page->index:0, size);
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if (data) {
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sg_init_one(&sg, data, size);
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} else {
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sg_init_table(&sg, 1);
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sg_set_page(&sg, page, size, 0);
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}
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if (e->cipher) {
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struct ablkcipher_request *req = e->data + crypto_hash_digestsize(e->hash);
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u8 iv[32];
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memset(iv, 0, sizeof(iv));
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memcpy(iv, &cmd_iv, sizeof(cmd_iv));
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ablkcipher_request_set_tfm(req, e->cipher);
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err = pohmelfs_crypto_process(req, &sg, &sg, iv, 0, e->timeout);
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if (err)
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goto err_out_exit;
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}
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if (e->hash) {
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struct hash_desc desc;
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void *dst = e->data + e->size/2;
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desc.tfm = e->hash;
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desc.flags = 0;
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err = crypto_hash_init(&desc);
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if (err)
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goto err_out_exit;
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err = crypto_hash_update(&desc, &sg, size);
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if (err)
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goto err_out_exit;
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err = crypto_hash_final(&desc, dst);
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if (err)
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goto err_out_exit;
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err = !!memcmp(dst, e->data, crypto_hash_digestsize(e->hash));
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if (err) {
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#ifdef CONFIG_POHMELFS_DEBUG
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unsigned int i;
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unsigned char *recv = e->data, *calc = dst;
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dprintk("%s: eng: %p, hash: %p, cipher: %p: iv : %llx, hash mismatch (recv/calc): ",
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__func__, e, e->hash, e->cipher, cmd_iv);
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for (i=0; i<crypto_hash_digestsize(e->hash); ++i) {
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#if 0
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dprintka("%02x ", recv[i]);
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if (recv[i] != calc[i]) {
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dprintka("| calc byte: %02x.\n", calc[i]);
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break;
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}
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#else
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dprintka("%02x/%02x ", recv[i], calc[i]);
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#endif
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}
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dprintk("\n");
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#endif
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goto err_out_exit;
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} else {
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dprintk("%s: eng: %p, hash: %p, cipher: %p: hashes matched.\n",
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__func__, e, e->hash, e->cipher);
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}
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}
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dprintk("%s: eng: %p, size: %u, hash: %p, cipher: %p: completed.\n",
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__func__, e, e->size, e->hash, e->cipher);
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return 0;
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err_out_exit:
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dprintk("%s: eng: %p, hash: %p, cipher: %p: err: %d.\n",
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__func__, e, e->hash, e->cipher, err);
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return err;
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}
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static int pohmelfs_trans_iter(struct netfs_trans *t, struct pohmelfs_crypto_engine *e,
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int (* iterator) (struct pohmelfs_crypto_engine *e,
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struct scatterlist *dst,
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struct scatterlist *src))
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{
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void *data = t->iovec.iov_base + sizeof(struct netfs_cmd) + t->psb->crypto_attached_size;
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unsigned int size = t->iovec.iov_len - sizeof(struct netfs_cmd) - t->psb->crypto_attached_size;
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struct netfs_cmd *cmd = data;
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unsigned int sz, pages = t->attached_pages, i, csize, cmd_cmd, dpage_idx;
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struct scatterlist sg_src, sg_dst;
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int err;
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while (size) {
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cmd = data;
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cmd_cmd = __be16_to_cpu(cmd->cmd);
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csize = __be32_to_cpu(cmd->size);
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cmd->iv = __cpu_to_be64(e->iv);
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if (cmd_cmd == NETFS_READ_PAGES || cmd_cmd == NETFS_READ_PAGE)
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csize = __be16_to_cpu(cmd->ext);
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sz = csize + __be16_to_cpu(cmd->cpad) + sizeof(struct netfs_cmd);
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dprintk("%s: size: %u, sz: %u, cmd_size: %u, cmd_cpad: %u.\n",
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__func__, size, sz, __be32_to_cpu(cmd->size), __be16_to_cpu(cmd->cpad));
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data += sz;
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size -= sz;
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sg_init_one(&sg_src, cmd->data, sz - sizeof(struct netfs_cmd));
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sg_init_one(&sg_dst, cmd->data, sz - sizeof(struct netfs_cmd));
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err = iterator(e, &sg_dst, &sg_src);
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if (err)
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return err;
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}
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if (!pages)
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return 0;
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dpage_idx = 0;
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for (i=0; i<t->page_num; ++i) {
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struct page *page = t->pages[i];
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struct page *dpage = e->pages[dpage_idx];
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if (!page)
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continue;
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sg_init_table(&sg_src, 1);
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sg_init_table(&sg_dst, 1);
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sg_set_page(&sg_src, page, page_private(page), 0);
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sg_set_page(&sg_dst, dpage, page_private(page), 0);
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err = iterator(e, &sg_dst, &sg_src);
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if (err)
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return err;
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pages--;
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if (!pages)
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break;
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dpage_idx++;
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}
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return 0;
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}
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static int pohmelfs_encrypt_iterator(struct pohmelfs_crypto_engine *e,
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struct scatterlist *sg_dst, struct scatterlist *sg_src)
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{
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struct ablkcipher_request *req = e->data;
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u8 iv[32];
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memset(iv, 0, sizeof(iv));
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memcpy(iv, &e->iv, sizeof(e->iv));
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return pohmelfs_crypto_process(req, sg_dst, sg_src, iv, 1, e->timeout);
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}
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static int pohmelfs_encrypt(struct pohmelfs_crypto_thread *tc)
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{
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struct netfs_trans *t = tc->trans;
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struct pohmelfs_crypto_engine *e = &tc->eng;
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struct ablkcipher_request *req = e->data;
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memset(req, 0, sizeof(struct ablkcipher_request));
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ablkcipher_request_set_tfm(req, e->cipher);
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e->iv = pohmelfs_gen_iv(t);
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return pohmelfs_trans_iter(t, e, pohmelfs_encrypt_iterator);
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}
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static int pohmelfs_hash_iterator(struct pohmelfs_crypto_engine *e,
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struct scatterlist *sg_dst, struct scatterlist *sg_src)
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{
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return crypto_hash_update(e->data, sg_src, sg_src->length);
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}
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static int pohmelfs_hash(struct pohmelfs_crypto_thread *tc)
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{
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struct pohmelfs_crypto_engine *e = &tc->eng;
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struct hash_desc *desc = e->data;
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unsigned char *dst = tc->trans->iovec.iov_base + sizeof(struct netfs_cmd);
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int err;
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desc->tfm = e->hash;
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desc->flags = 0;
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err = crypto_hash_init(desc);
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if (err)
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return err;
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err = pohmelfs_trans_iter(tc->trans, e, pohmelfs_hash_iterator);
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if (err)
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return err;
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err = crypto_hash_final(desc, dst);
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if (err)
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return err;
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{
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unsigned int i;
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dprintk("%s: ", __func__);
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for (i=0; i<tc->psb->crypto_attached_size; ++i)
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dprintka("%02x ", dst[i]);
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dprintka("\n");
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}
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return 0;
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}
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static void pohmelfs_crypto_pages_free(struct pohmelfs_crypto_engine *e)
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{
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unsigned int i;
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for (i=0; i<e->page_num; ++i)
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__free_page(e->pages[i]);
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kfree(e->pages);
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}
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static int pohmelfs_crypto_pages_alloc(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb)
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{
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unsigned int i;
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e->pages = kmalloc(psb->trans_max_pages * sizeof(struct page *), GFP_KERNEL);
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if (!e->pages)
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return -ENOMEM;
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for (i=0; i<psb->trans_max_pages; ++i) {
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e->pages[i] = alloc_page(GFP_KERNEL);
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if (!e->pages[i])
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break;
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}
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e->page_num = i;
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if (!e->page_num)
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goto err_out_free;
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return 0;
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err_out_free:
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kfree(e->pages);
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return -ENOMEM;
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}
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static void pohmelfs_sys_crypto_exit_one(struct pohmelfs_crypto_thread *t)
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{
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struct pohmelfs_sb *psb = t->psb;
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if (t->thread)
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kthread_stop(t->thread);
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mutex_lock(&psb->crypto_thread_lock);
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list_del(&t->thread_entry);
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psb->crypto_thread_num--;
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mutex_unlock(&psb->crypto_thread_lock);
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pohmelfs_crypto_engine_exit(&t->eng);
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pohmelfs_crypto_pages_free(&t->eng);
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kfree(t);
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}
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static int pohmelfs_crypto_finish(struct netfs_trans *t, struct pohmelfs_sb *psb, int err)
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{
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struct netfs_cmd *cmd = t->iovec.iov_base;
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netfs_convert_cmd(cmd);
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if (likely(!err))
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err = netfs_trans_finish_send(t, psb);
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t->result = err;
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netfs_trans_put(t);
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return err;
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}
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void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th)
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{
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struct pohmelfs_sb *psb = th->psb;
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th->page = NULL;
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th->trans = NULL;
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mutex_lock(&psb->crypto_thread_lock);
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list_move_tail(&th->thread_entry, &psb->crypto_ready_list);
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mutex_unlock(&psb->crypto_thread_lock);
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wake_up(&psb->wait);
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}
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static int pohmelfs_crypto_thread_trans(struct pohmelfs_crypto_thread *t)
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{
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struct netfs_trans *trans;
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int err = 0;
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trans = t->trans;
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trans->eng = NULL;
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if (t->eng.hash) {
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err = pohmelfs_hash(t);
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if (err)
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goto out_complete;
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}
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if (t->eng.cipher) {
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err = pohmelfs_encrypt(t);
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if (err)
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goto out_complete;
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trans->eng = &t->eng;
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}
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out_complete:
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t->page = NULL;
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t->trans = NULL;
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if (!trans->eng)
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pohmelfs_crypto_thread_make_ready(t);
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|
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pohmelfs_crypto_finish(trans, t->psb, err);
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_crypto_thread_page(struct pohmelfs_crypto_thread *t)
|
|
{
|
|
struct pohmelfs_crypto_engine *e = &t->eng;
|
|
struct page *page = t->page;
|
|
int err;
|
|
|
|
WARN_ON(!PageChecked(page));
|
|
|
|
err = pohmelfs_crypto_process_input_data(e, e->iv, NULL, page, t->size);
|
|
if (!err)
|
|
SetPageUptodate(page);
|
|
else
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
pohmelfs_crypto_thread_make_ready(t);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_crypto_thread_func(void *data)
|
|
{
|
|
struct pohmelfs_crypto_thread *t = data;
|
|
|
|
while (!kthread_should_stop()) {
|
|
wait_event_interruptible(t->wait, kthread_should_stop() ||
|
|
t->trans || t->page);
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
if (!t->trans && !t->page)
|
|
continue;
|
|
|
|
dprintk("%s: thread: %p, trans: %p, page: %p.\n",
|
|
__func__, t, t->trans, t->page);
|
|
|
|
if (t->trans)
|
|
pohmelfs_crypto_thread_trans(t);
|
|
else if (t->page)
|
|
pohmelfs_crypto_thread_page(t);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pohmelfs_crypto_flush(struct pohmelfs_sb *psb, struct list_head *head)
|
|
{
|
|
while (!list_empty(head)) {
|
|
struct pohmelfs_crypto_thread *t = NULL;
|
|
|
|
mutex_lock(&psb->crypto_thread_lock);
|
|
if (!list_empty(head)) {
|
|
t = list_first_entry(head, struct pohmelfs_crypto_thread, thread_entry);
|
|
list_del_init(&t->thread_entry);
|
|
}
|
|
mutex_unlock(&psb->crypto_thread_lock);
|
|
|
|
if (t)
|
|
pohmelfs_sys_crypto_exit_one(t);
|
|
}
|
|
}
|
|
|
|
static void pohmelfs_sys_crypto_exit(struct pohmelfs_sb *psb)
|
|
{
|
|
while (!list_empty(&psb->crypto_active_list) || !list_empty(&psb->crypto_ready_list)) {
|
|
dprintk("%s: crypto_thread_num: %u.\n", __func__, psb->crypto_thread_num);
|
|
pohmelfs_crypto_flush(psb, &psb->crypto_active_list);
|
|
pohmelfs_crypto_flush(psb, &psb->crypto_ready_list);
|
|
}
|
|
}
|
|
|
|
static int pohmelfs_sys_crypto_init(struct pohmelfs_sb *psb)
|
|
{
|
|
unsigned int i;
|
|
struct pohmelfs_crypto_thread *t;
|
|
struct pohmelfs_config *c;
|
|
struct netfs_state *st;
|
|
int err;
|
|
|
|
list_for_each_entry(c, &psb->state_list, config_entry) {
|
|
st = &c->state;
|
|
|
|
err = pohmelfs_crypto_engine_init(&st->eng, psb);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
dprintk("%s: st: %p, eng: %p, hash: %p, cipher: %p.\n",
|
|
__func__, st, &st->eng, &st->eng.hash, &st->eng.cipher);
|
|
}
|
|
|
|
for (i=0; i<psb->crypto_thread_num; ++i) {
|
|
err = -ENOMEM;
|
|
t = kzalloc(sizeof(struct pohmelfs_crypto_thread), GFP_KERNEL);
|
|
if (!t)
|
|
goto err_out_free_state_engines;
|
|
|
|
init_waitqueue_head(&t->wait);
|
|
|
|
t->psb = psb;
|
|
t->trans = NULL;
|
|
t->eng.thread = t;
|
|
|
|
err = pohmelfs_crypto_engine_init(&t->eng, psb);
|
|
if (err)
|
|
goto err_out_free_state_engines;
|
|
|
|
err = pohmelfs_crypto_pages_alloc(&t->eng, psb);
|
|
if (err)
|
|
goto err_out_free;
|
|
|
|
t->thread = kthread_run(pohmelfs_crypto_thread_func, t,
|
|
"pohmelfs-crypto-%d-%d", psb->idx, i);
|
|
if (IS_ERR(t->thread)) {
|
|
err = PTR_ERR(t->thread);
|
|
t->thread = NULL;
|
|
goto err_out_free;
|
|
}
|
|
|
|
if (t->eng.cipher)
|
|
psb->crypto_align_size = crypto_ablkcipher_blocksize(t->eng.cipher);
|
|
|
|
mutex_lock(&psb->crypto_thread_lock);
|
|
list_add_tail(&t->thread_entry, &psb->crypto_ready_list);
|
|
mutex_unlock(&psb->crypto_thread_lock);
|
|
}
|
|
|
|
psb->crypto_thread_num = i;
|
|
return 0;
|
|
|
|
err_out_free:
|
|
pohmelfs_sys_crypto_exit_one(t);
|
|
err_out_free_state_engines:
|
|
list_for_each_entry(c, &psb->state_list, config_entry) {
|
|
st = &c->state;
|
|
pohmelfs_crypto_engine_exit(&st->eng);
|
|
}
|
|
err_out_exit:
|
|
pohmelfs_sys_crypto_exit(psb);
|
|
return err;
|
|
}
|
|
|
|
void pohmelfs_crypto_exit(struct pohmelfs_sb *psb)
|
|
{
|
|
pohmelfs_sys_crypto_exit(psb);
|
|
|
|
kfree(psb->hash_string);
|
|
kfree(psb->cipher_string);
|
|
}
|
|
|
|
static int pohmelfs_crypt_init_complete(struct page **pages, unsigned int page_num,
|
|
void *private, int err)
|
|
{
|
|
struct pohmelfs_sb *psb = private;
|
|
|
|
psb->flags = -err;
|
|
dprintk("%s: err: %d.\n", __func__, err);
|
|
|
|
wake_up(&psb->wait);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_crypto_init_handshake(struct pohmelfs_sb *psb)
|
|
{
|
|
struct netfs_trans *t;
|
|
struct netfs_crypto_capabilities *cap;
|
|
struct netfs_cmd *cmd;
|
|
char *str;
|
|
int err = -ENOMEM, size;
|
|
|
|
size = sizeof(struct netfs_crypto_capabilities) +
|
|
psb->cipher_strlen + psb->hash_strlen + 2; /* 0 bytes */
|
|
|
|
t = netfs_trans_alloc(psb, size, 0, 0);
|
|
if (!t)
|
|
goto err_out_exit;
|
|
|
|
t->complete = pohmelfs_crypt_init_complete;
|
|
t->private = psb;
|
|
|
|
cmd = netfs_trans_current(t);
|
|
cap = (struct netfs_crypto_capabilities *)(cmd + 1);
|
|
str = (char *)(cap + 1);
|
|
|
|
cmd->cmd = NETFS_CAPABILITIES;
|
|
cmd->id = POHMELFS_CRYPTO_CAPABILITIES;
|
|
cmd->size = size;
|
|
cmd->start = 0;
|
|
cmd->ext = 0;
|
|
cmd->csize = 0;
|
|
|
|
netfs_convert_cmd(cmd);
|
|
netfs_trans_update(cmd, t, size);
|
|
|
|
cap->hash_strlen = psb->hash_strlen;
|
|
if (cap->hash_strlen) {
|
|
sprintf(str, "%s", psb->hash_string);
|
|
str += cap->hash_strlen;
|
|
}
|
|
|
|
cap->cipher_strlen = psb->cipher_strlen;
|
|
cap->cipher_keysize = psb->cipher_keysize;
|
|
if (cap->cipher_strlen)
|
|
sprintf(str, "%s", psb->cipher_string);
|
|
|
|
netfs_convert_crypto_capabilities(cap);
|
|
|
|
psb->flags = ~0;
|
|
err = netfs_trans_finish(t, psb);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
err = wait_event_interruptible_timeout(psb->wait, (psb->flags != ~0),
|
|
psb->wait_on_page_timeout);
|
|
if (!err)
|
|
err = -ETIMEDOUT;
|
|
else
|
|
err = -psb->flags;
|
|
|
|
if (!err)
|
|
psb->perform_crypto = 1;
|
|
psb->flags = 0;
|
|
|
|
/*
|
|
* At this point NETFS_CAPABILITIES response command
|
|
* should setup superblock in a way, which is acceptible
|
|
* for both client and server, so if server refuses connection,
|
|
* it will send error in transaction response.
|
|
*/
|
|
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
return err;
|
|
}
|
|
|
|
int pohmelfs_crypto_init(struct pohmelfs_sb *psb)
|
|
{
|
|
int err;
|
|
|
|
if (!psb->cipher_string && !psb->hash_string)
|
|
return 0;
|
|
|
|
err = pohmelfs_crypto_init_handshake(psb);
|
|
if (err)
|
|
return err;
|
|
|
|
err = pohmelfs_sys_crypto_init(psb);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pohmelfs_crypto_thread_get(struct pohmelfs_sb *psb,
|
|
int (* action)(struct pohmelfs_crypto_thread *t, void *data), void *data)
|
|
{
|
|
struct pohmelfs_crypto_thread *t = NULL;
|
|
int err;
|
|
|
|
while (!t) {
|
|
err = wait_event_interruptible_timeout(psb->wait,
|
|
!list_empty(&psb->crypto_ready_list),
|
|
psb->wait_on_page_timeout);
|
|
|
|
t = NULL;
|
|
err = 0;
|
|
mutex_lock(&psb->crypto_thread_lock);
|
|
if (!list_empty(&psb->crypto_ready_list)) {
|
|
t = list_entry(psb->crypto_ready_list.prev,
|
|
struct pohmelfs_crypto_thread,
|
|
thread_entry);
|
|
|
|
list_move_tail(&t->thread_entry,
|
|
&psb->crypto_active_list);
|
|
|
|
action(t, data);
|
|
wake_up(&t->wait);
|
|
|
|
}
|
|
mutex_unlock(&psb->crypto_thread_lock);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int pohmelfs_trans_crypt_action(struct pohmelfs_crypto_thread *t, void *data)
|
|
{
|
|
struct netfs_trans *trans = data;
|
|
|
|
netfs_trans_get(trans);
|
|
t->trans = trans;
|
|
|
|
dprintk("%s: t: %p, gen: %u, thread: %p.\n", __func__, trans, trans->gen, t);
|
|
return 0;
|
|
}
|
|
|
|
int pohmelfs_trans_crypt(struct netfs_trans *trans, struct pohmelfs_sb *psb)
|
|
{
|
|
if ((!psb->hash_string && !psb->cipher_string) || !psb->perform_crypto) {
|
|
netfs_trans_get(trans);
|
|
return pohmelfs_crypto_finish(trans, psb, 0);
|
|
}
|
|
|
|
return pohmelfs_crypto_thread_get(psb, pohmelfs_trans_crypt_action, trans);
|
|
}
|
|
|
|
struct pohmelfs_crypto_input_action_data {
|
|
struct page *page;
|
|
struct pohmelfs_crypto_engine *e;
|
|
u64 iv;
|
|
unsigned int size;
|
|
};
|
|
|
|
static int pohmelfs_crypt_input_page_action(struct pohmelfs_crypto_thread *t, void *data)
|
|
{
|
|
struct pohmelfs_crypto_input_action_data *act = data;
|
|
|
|
memcpy(t->eng.data, act->e->data, t->psb->crypto_attached_size);
|
|
|
|
t->size = act->size;
|
|
t->eng.iv = act->iv;
|
|
|
|
t->page = act->page;
|
|
return 0;
|
|
}
|
|
|
|
int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e,
|
|
struct page *page, unsigned int size, u64 iv)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct pohmelfs_crypto_input_action_data act;
|
|
int err = -ENOENT;
|
|
|
|
act.page = page;
|
|
act.e = e;
|
|
act.size = size;
|
|
act.iv = iv;
|
|
|
|
err = pohmelfs_crypto_thread_get(POHMELFS_SB(inode->i_sb),
|
|
pohmelfs_crypt_input_page_action, &act);
|
|
if (err)
|
|
goto err_out_exit;
|
|
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
SetPageUptodate(page);
|
|
page_cache_release(page);
|
|
|
|
return err;
|
|
}
|