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/*
* Copyright (C) 2013 Kay Sievers
* Copyright (C) 2013 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Copyright (C) 2013 Daniel Mack <daniel@zonque.org>
* Copyright (C) 2013 Linux Foundation
*
* 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_UTIL_H
#define __KDBUS_UTIL_H
#include "linux/ioctl.h"
#include "kdbus.h"
/* all exported addresses are 64 bit */
#define KDBUS_PTR(addr) ((void __user *)(uintptr_t)(addr))
/* all exported sizes are 64 bit and data aligned to 64 bit */
#define KDBUS_ALIGN8(s) ALIGN((s), 8)
#define KDBUS_IS_ALIGNED8(s) (IS_ALIGNED(s, 8))
/* generic access and iterators over a stream of items */
#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_NEXT(item) \
(typeof(item))(((u8 *)item) + KDBUS_ALIGN8((item)->size))
#define KDBUS_ITEM_VALID(item, head) \
((item)->size > KDBUS_ITEM_HEADER_SIZE && \
(u8 *)(item) + (item)->size <= (u8 *)(head) + (head)->size) && \
(u8 *)(item) >= (u8 *)(head)
#define KDBUS_ITEMS_SIZE(head, first) \
(head)->size - offsetof(typeof(*head), first)
#define KDBUS_ITEMS_FOREACH_SIZE(item, items, size) \
for (item = items; \
((u8 *)(item) < (u8 *)(items) + (size)) && \
((u8 *)(item) >= (u8 *)(items)); \
item = KDBUS_ITEM_NEXT(item))
#define KDBUS_ITEMS_FOREACH(item, head, first) \
KDBUS_ITEMS_FOREACH_SIZE(item, (head)->first, \
KDBUS_ITEMS_SIZE(head, first))
#define KDBUS_ITEMS_END(item, head) \
((u8 *)item == ((u8 *)(head) + KDBUS_ALIGN8((head)->size)))
/**
* kdbus_size_get_user - read the size variable from user memory
* @_s: Size variable
* @_b: Buffer to read from
* @_t: Structure, "size" is a member of
*
* Return: the result of copy_from_user()
*/
#define kdbus_size_get_user(_s, _b, _t) \
({ \
u64 __user *_sz = (void __user *)(_b) + offsetof(typeof(_t), size); \
copy_from_user(_s, _sz, sizeof(__u64)); \
})
/**
* kdbus_offset_set_user - write the offset variable to user memory
* @_s: Offset variable
* @_b: Buffer to write to
* @_t: Structure, "offset" is a member of
*
* Return: the result of copy_to_user()
*/
#define kdbus_offset_set_user(_s, _b, _t) \
({ \
u64 __user *_sz = (void __user *)(_b) + offsetof(_t, offset); \
copy_to_user(_sz, _s, sizeof(__u64)); \
})
/**
* kdbus_check_strlen - check length of a string at the end a structure
* @_p: A pointer to a structure that has a size member and
* a variable string at its end
* @_s: The name of the dynamically sized string member
*
* Return: 1 if the string's end marker is withing the struct, or 0 otherwise.
*/
#define kdbus_check_strlen(_p, _s) \
({ \
size_t _max = (_p)->size - offsetof(typeof(*(_p)), _s); \
_max == 0 || strnlen((_p)->_s, _max) != _max; \
})
/**
* kdbus_item_validate_nul - check the validity of an item containing a string
* @item: Item to check
*
* Validate that a string in a given item matches the given size, and the
* string is \0 terminated.
*
* Return: true if the string in given item is valid
*/
static inline bool kdbus_item_validate_nul(const struct kdbus_item *item)
{
size_t l = item->size - KDBUS_ITEM_HEADER_SIZE;
return l > 0 && memchr(item->str, '\0', l) == item->str + l - 1;
}
/**
* kdbus_str_hash - calculate a hash
* @str: String
*
* Return: hash value
*/
static inline unsigned int kdbus_str_hash(const char *str)
{
return full_name_hash(str, strlen(str));
}
int kdbus_sysname_is_valid(const char *name);
#endif
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