Release 4.18 tools/lib/bpf/nlattr.h

/* SPDX-License-Identifier: LGPL-2.1 */

/*
 * NETLINK      Netlink attributes
 *
 *      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) 2003-2013 Thomas Graf <tgraf@suug.ch>
 */

#ifndef __NLATTR_H

#define __NLATTR_H

#include <stdint.h>
#include <linux/netlink.h>
/* avoid multiple definition of netlink features */

#define __LINUX_NETLINK_H

/**
 * Standard attribute types to specify validation policy
 */

enum {
	
NLA_UNSPEC,	/**< Unspecified type, binary data chunk */
	
NLA_U8,		/**< 8 bit integer */
	
NLA_U16,	/**< 16 bit integer */
	
NLA_U32,	/**< 32 bit integer */
	
NLA_U64,	/**< 64 bit integer */
	
NLA_STRING,	/**< NUL terminated character string */
	
NLA_FLAG,	/**< Flag */
	
NLA_MSECS,	/**< Micro seconds (64bit) */
	
NLA_NESTED,	/**< Nested attributes */
	
__NLA_TYPE_MAX,
};


#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)

/**
 * @ingroup attr
 * Attribute validation policy.
 *
 * See section @core_doc{core_attr_parse,Attribute Parsing} for more details.
 */

struct nla_policy {
	/** Type of attribute or NLA_UNSPEC */
	
uint16_t	type;

	/** Minimal length of payload required */
	
uint16_t	minlen;

	/** Maximal length of payload allowed */
	
uint16_t	maxlen;
};

/**
 * @ingroup attr
 * Iterate over a stream of attributes
 * @arg pos     loop counter, set to current attribute
 * @arg head    head of attribute stream
 * @arg len     length of attribute stream
 * @arg rem     initialized to len, holds bytes currently remaining in stream
 */

#define nla_for_each_attr(pos, head, len, rem) \
	for (pos = head, rem = len; \
             nla_ok(pos, rem); \
             pos = nla_next(pos, &(rem)))

int nla_dump_errormsg(struct nlmsghdr *nlh);

#endif /* __NLATTR_H */
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Directory: tools/lib/bpf

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