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/*
* Copyright (C) 2013-2015 Kay Sievers
* Copyright (C) 2013-2015 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Copyright (C) 2013-2015 Daniel Mack <daniel@zonque.org>
* Copyright (C) 2013-2015 David Herrmann <dh.herrmann@gmail.com>
* Copyright (C) 2013-2015 Linux Foundation
* Copyright (C) 2014-2015 Djalal Harouni <tixxdz@opendz.org>
*
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*/
#ifndef __KDBUS_ITEM_H
#define __KDBUS_ITEM_H
#include <linux/kernel.h>
#include <uapi/linux/kdbus.h>
#include "util.h"
/* generic access and iterators over a stream of items */
#define KDBUS_ITEM_NEXT(_i) (typeof(_i))((u8 *)(_i) + KDBUS_ALIGN8((_i)->size))
#define KDBUS_ITEMS_SIZE(_h, _is) ((_h)->size - offsetof(typeof(*(_h)), _is))
#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
#define KDBUS_ITEM_SIZE(_s) KDBUS_ALIGN8(KDBUS_ITEM_HEADER_SIZE + (_s))
#define KDBUS_ITEM_PAYLOAD_SIZE(_i) ((_i)->size - KDBUS_ITEM_HEADER_SIZE)
#define KDBUS_ITEMS_FOREACH(_i, _is, _s) \
for ((_i) = (_is); \
((u8 *)(_i) < (u8 *)(_is) + (_s)) && \
((u8 *)(_i) >= (u8 *)(_is)); \
(_i) = KDBUS_ITEM_NEXT(_i))
#define KDBUS_ITEM_VALID(_i, _is, _s) \
((_i)->size >= KDBUS_ITEM_HEADER_SIZE && \
(u8 *)(_i) + (_i)->size > (u8 *)(_i) && \
(u8 *)(_i) + (_i)->size <= (u8 *)(_is) + (_s) && \
(u8 *)(_i) >= (u8 *)(_is))
#define KDBUS_ITEMS_END(_i, _is, _s) \
((u8 *)(_i) == ((u8 *)(_is) + KDBUS_ALIGN8(_s)))
/**
* struct kdbus_item_header - Describes the fix part of an item
* @size: The total size of the item
* @type: The item type, one of KDBUS_ITEM_*
*/
struct kdbus_item_header {
u64 size;
u64 type;
};
int kdbus_item_validate_name(const struct kdbus_item *item);
int kdbus_item_validate(const struct kdbus_item *item);
int kdbus_items_validate(const struct kdbus_item *items, size_t items_size);
struct kdbus_item *kdbus_item_set(struct kdbus_item *item, u64 type,
const void *data, size_t len);
#endif
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