mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 14:15:51 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25525 3c298f89-4303-0410-b956-a3cf2f4a3e73
280 lines
5.8 KiB
C
280 lines
5.8 KiB
C
/*
|
|
* lib/object.c Generic Cacheable Object
|
|
*
|
|
* This library 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 version 2.1
|
|
* of the License.
|
|
*
|
|
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
|
|
*/
|
|
|
|
/**
|
|
* @ingroup cache
|
|
* @defgroup object Object
|
|
* @{
|
|
*/
|
|
|
|
#include <netlink-local.h>
|
|
#include <netlink/netlink.h>
|
|
#include <netlink/cache.h>
|
|
#include <netlink/object.h>
|
|
#include <netlink/utils.h>
|
|
|
|
static inline struct nl_object_ops *obj_ops(struct nl_object *obj)
|
|
{
|
|
if (!obj->ce_ops)
|
|
BUG();
|
|
|
|
return obj->ce_ops;
|
|
}
|
|
|
|
/**
|
|
* @name Object Creation/Deletion
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Allocate a new object of kind specified by the operations handle
|
|
* @arg ops cache operations handle
|
|
* @return The new object or NULL
|
|
*/
|
|
struct nl_object *nl_object_alloc(struct nl_object_ops *ops)
|
|
{
|
|
struct nl_object *new;
|
|
|
|
if (ops->oo_size < sizeof(*new))
|
|
BUG();
|
|
|
|
new = calloc(1, ops->oo_size);
|
|
if (!new)
|
|
return NULL;
|
|
|
|
new->ce_refcnt = 1;
|
|
nl_init_list_head(&new->ce_list);
|
|
|
|
new->ce_ops = ops;
|
|
if (ops->oo_constructor)
|
|
ops->oo_constructor(new);
|
|
|
|
NL_DBG(4, "Allocated new object %p\n", new);
|
|
|
|
return new;
|
|
}
|
|
|
|
#ifdef disabled
|
|
/**
|
|
* Allocate a new object of kind specified by the name
|
|
* @arg kind name of object type
|
|
* @return The new object or nULL
|
|
*/
|
|
int nl_object_alloc_name(const char *kind, struct nl_object **result)
|
|
{
|
|
struct nl_cache_ops *ops;
|
|
|
|
ops = nl_cache_ops_lookup(kind);
|
|
if (!ops)
|
|
return -NLE_OPNOTSUPP;
|
|
|
|
if (!(*result = nl_object_alloc(ops->co_obj_ops)))
|
|
return -NLE_NOMEM;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
struct nl_derived_object {
|
|
NLHDR_COMMON
|
|
char data;
|
|
};
|
|
|
|
/**
|
|
* Allocate a new object and copy all data from an existing object
|
|
* @arg obj object to inherite data from
|
|
* @return The new object or NULL.
|
|
*/
|
|
struct nl_object *nl_object_clone(struct nl_object *obj)
|
|
{
|
|
struct nl_object *new;
|
|
struct nl_object_ops *ops = obj_ops(obj);
|
|
int doff = offsetof(struct nl_derived_object, data);
|
|
int size;
|
|
|
|
new = nl_object_alloc(ops);
|
|
if (!new)
|
|
return NULL;
|
|
|
|
size = ops->oo_size - doff;
|
|
if (size < 0)
|
|
BUG();
|
|
|
|
new->ce_ops = obj->ce_ops;
|
|
new->ce_msgtype = obj->ce_msgtype;
|
|
|
|
if (size)
|
|
memcpy((void *)new + doff, (void *)obj + doff, size);
|
|
|
|
if (ops->oo_clone) {
|
|
if (ops->oo_clone(new, obj) < 0) {
|
|
nl_object_free(new);
|
|
return NULL;
|
|
}
|
|
} else if (size && ops->oo_free_data)
|
|
BUG();
|
|
|
|
return new;
|
|
}
|
|
|
|
/**
|
|
* Free a cacheable object
|
|
* @arg obj object to free
|
|
*
|
|
* @return 0 or a negative error code.
|
|
*/
|
|
void nl_object_free(struct nl_object *obj)
|
|
{
|
|
struct nl_object_ops *ops = obj_ops(obj);
|
|
|
|
if (obj->ce_refcnt > 0)
|
|
NL_DBG(1, "Warning: Freeing object in use...\n");
|
|
|
|
if (obj->ce_cache)
|
|
nl_cache_remove(obj);
|
|
|
|
if (ops->oo_free_data)
|
|
ops->oo_free_data(obj);
|
|
|
|
free(obj);
|
|
|
|
NL_DBG(4, "Freed object %p\n", obj);
|
|
}
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @name Reference Management
|
|
* @{
|
|
*/
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @name Utillities
|
|
* @{
|
|
*/
|
|
|
|
#ifdef disabled
|
|
/**
|
|
* Dump this object according to the specified parameters
|
|
* @arg obj object to dump
|
|
* @arg params dumping parameters
|
|
*/
|
|
void nl_object_dump(struct nl_object *obj, struct nl_dump_params *params)
|
|
{
|
|
dump_from_ops(obj, params);
|
|
}
|
|
|
|
/**
|
|
* Check if the identifiers of two objects are identical
|
|
* @arg a an object
|
|
* @arg b another object of same type
|
|
*
|
|
* @return true if both objects have equal identifiers, otherwise false.
|
|
*/
|
|
int nl_object_identical(struct nl_object *a, struct nl_object *b)
|
|
{
|
|
struct nl_object_ops *ops = obj_ops(a);
|
|
int req_attrs;
|
|
|
|
/* Both objects must be of same type */
|
|
if (ops != obj_ops(b))
|
|
return 0;
|
|
|
|
req_attrs = ops->oo_id_attrs;
|
|
|
|
/* Both objects must provide all required attributes to uniquely
|
|
* identify an object */
|
|
if ((a->ce_mask & req_attrs) != req_attrs ||
|
|
(b->ce_mask & req_attrs) != req_attrs)
|
|
return 0;
|
|
|
|
/* Can't judge unless we can compare */
|
|
if (ops->oo_compare == NULL)
|
|
return 0;
|
|
|
|
return !(ops->oo_compare(a, b, req_attrs, 0));
|
|
}
|
|
|
|
/**
|
|
* Compute bitmask representing difference in attribute values
|
|
* @arg a an object
|
|
* @arg b another object of same type
|
|
*
|
|
* The bitmask returned is specific to an object type, each bit set represents
|
|
* an attribute which mismatches in either of the two objects. Unavailability
|
|
* of an attribute in one object and presence in the other is regarded a
|
|
* mismatch as well.
|
|
*
|
|
* @return Bitmask describing differences or 0 if they are completely identical.
|
|
*/
|
|
uint32_t nl_object_diff(struct nl_object *a, struct nl_object *b)
|
|
{
|
|
struct nl_object_ops *ops = obj_ops(a);
|
|
|
|
if (ops != obj_ops(b) || ops->oo_compare == NULL)
|
|
return UINT_MAX;
|
|
|
|
return ops->oo_compare(a, b, ~0, 0);
|
|
}
|
|
|
|
/**
|
|
* Match a filter against an object
|
|
* @arg obj object to check
|
|
* @arg filter object of same type acting as filter
|
|
*
|
|
* @return 1 if the object matches the filter or 0
|
|
* if no filter procedure is available or if the
|
|
* filter does not match.
|
|
*/
|
|
int nl_object_match_filter(struct nl_object *obj, struct nl_object *filter)
|
|
{
|
|
struct nl_object_ops *ops = obj_ops(obj);
|
|
|
|
if (ops != obj_ops(filter) || ops->oo_compare == NULL)
|
|
return 0;
|
|
|
|
return !(ops->oo_compare(obj, filter, filter->ce_mask,
|
|
LOOSE_COMPARISON));
|
|
}
|
|
|
|
/**
|
|
* Convert bitmask of attributes to a character string
|
|
* @arg obj object of same type as attribute bitmask
|
|
* @arg attrs bitmask of attribute types
|
|
* @arg buf destination buffer
|
|
* @arg len length of destination buffer
|
|
*
|
|
* Converts the bitmask of attribute types into a list of attribute
|
|
* names separated by comas.
|
|
*
|
|
* @return destination buffer.
|
|
*/
|
|
char *nl_object_attrs2str(struct nl_object *obj, uint32_t attrs,
|
|
char *buf, size_t len)
|
|
{
|
|
struct nl_object_ops *ops = obj_ops(obj);
|
|
|
|
if (ops->oo_attrs2str != NULL)
|
|
return ops->oo_attrs2str(attrs, buf, len);
|
|
else {
|
|
memset(buf, 0, len);
|
|
return buf;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/** @} */
|
|
|
|
/** @} */
|