1/* SPDX-License-Identifier: LGPL-2.1 */
 2
 3/*
 4 * NETLINK      Netlink attributes
 5 *
 6 *	This library is free software; you can redistribute it and/or
 7 *	modify it under the terms of the GNU Lesser General Public
 8 *	License as published by the Free Software Foundation version 2.1
 9 *	of the License.
10 *
11 * Copyright (c) 2003-2013 Thomas Graf <tgraf@suug.ch>
12 */
13
14#ifndef __NLATTR_H
15#define __NLATTR_H
16
17#include <stdint.h>
18#include <linux/netlink.h>
19/* avoid multiple definition of netlink features */
20#define __LINUX_NETLINK_H
21
22/**
23 * Standard attribute types to specify validation policy
24 */
25enum {
26	NLA_UNSPEC,	/**< Unspecified type, binary data chunk */
27	NLA_U8,		/**< 8 bit integer */
28	NLA_U16,	/**< 16 bit integer */
29	NLA_U32,	/**< 32 bit integer */
30	NLA_U64,	/**< 64 bit integer */
31	NLA_STRING,	/**< NUL terminated character string */
32	NLA_FLAG,	/**< Flag */
33	NLA_MSECS,	/**< Micro seconds (64bit) */
34	NLA_NESTED,	/**< Nested attributes */
35	__NLA_TYPE_MAX,
36};
37
38#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
39
40/**
41 * @ingroup attr
42 * Attribute validation policy.
43 *
44 * See section @core_doc{core_attr_parse,Attribute Parsing} for more details.
45 */
46struct nla_policy {
47	/** Type of attribute or NLA_UNSPEC */
48	uint16_t	type;
49
50	/** Minimal length of payload required */
51	uint16_t	minlen;
52
53	/** Maximal length of payload allowed */
54	uint16_t	maxlen;
55};
56
57/**
58 * @ingroup attr
59 * Iterate over a stream of attributes
60 * @arg pos	loop counter, set to current attribute
61 * @arg head	head of attribute stream
62 * @arg len	length of attribute stream
63 * @arg rem	initialized to len, holds bytes currently remaining in stream
64 */
65#define nla_for_each_attr(pos, head, len, rem) \
66	for (pos = head, rem = len; \
67	     nla_ok(pos, rem); \
68	     pos = nla_next(pos, &(rem)))
69
70int nla_dump_errormsg(struct nlmsghdr *nlh);
71
72#endif /* __NLATTR_H */