/
attr.h
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/
attr.h
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/*
* netlink/attr.h 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 NETLINK_ATTR_H_
#define NETLINK_ATTR_H_
#include <netlink/netlink.h>
#include <netlink/object.h>
#include <netlink/addr.h>
#include <netlink/data.h>
#ifdef __cplusplus
extern "C" {
#endif
struct nl_msg;
/**
* @name Basic Attribute Data Types
* @{
*/
/**
* @ingroup attr
* Basic attribute data types
*
* See section @core_doc{core_attr_parse,Attribute Parsing} for more details.
*/
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;
};
/* Size calculations */
extern int nla_attr_size(int payload);
extern int nla_total_size(int payload);
extern int nla_padlen(int payload);
/* Attribute parsing */
extern int nla_type(const struct nlattr *);
extern void * nla_data(const struct nlattr *);
extern int nla_len(const struct nlattr *);
extern int nla_ok(const struct nlattr *, int);
extern struct nlattr * nla_next(const struct nlattr *, int *);
extern int nla_parse(struct nlattr **, int, struct nlattr *,
int, struct nla_policy *);
extern int nla_validate(const struct nlattr *, int, int,
const struct nla_policy *);
extern struct nlattr * nla_find(const struct nlattr *, int, int);
/* Helper Functions */
extern int nla_memcpy(void *, const struct nlattr *, int);
extern size_t nla_strlcpy(char *, const struct nlattr *, size_t);
extern int nla_memcmp(const struct nlattr *, const void *, size_t);
extern int nla_strcmp(const struct nlattr *, const char *);
/* Unspecific attribute */
extern struct nlattr * nla_reserve(struct nl_msg *, int, int);
extern int nla_put(struct nl_msg *, int, int, const void *);
extern int nla_put_data(struct nl_msg *, int,
const struct nl_data *);
extern int nla_put_addr(struct nl_msg *, int, struct nl_addr *);
/* Integer attribute */
extern uint8_t nla_get_u8(const struct nlattr *);
extern int nla_put_u8(struct nl_msg *, int, uint8_t);
extern uint16_t nla_get_u16(const struct nlattr *);
extern int nla_put_u16(struct nl_msg *, int, uint16_t);
extern int32_t nla_get_s32(const struct nlattr *);
extern int nla_put_s32(struct nl_msg *, int, int32_t);
extern uint32_t nla_get_u32(const struct nlattr *);
extern int nla_put_u32(struct nl_msg *, int, uint32_t);
extern uint64_t nla_get_u64(const struct nlattr *);
extern int nla_put_u64(struct nl_msg *, int, uint64_t);
/* String attribute */
extern char * nla_get_string(const struct nlattr *);
extern char * nla_strdup(const struct nlattr *);
extern int nla_put_string(struct nl_msg *, int, const char *);
/* Flag attribute */
extern int nla_get_flag(const struct nlattr *);
extern int nla_put_flag(struct nl_msg *, int);
/* Msec attribute */
extern unsigned long nla_get_msecs(const struct nlattr *);
extern int nla_put_msecs(struct nl_msg *, int, unsigned long);
/* Attribute nesting */
extern int nla_put_nested(struct nl_msg *, int,
const struct nl_msg *);
extern struct nlattr * nla_nest_start(struct nl_msg *, int);
extern int nla_nest_end(struct nl_msg *, struct nlattr *);
extern void nla_nest_cancel(struct nl_msg *, const struct nlattr *);
extern int nla_parse_nested(struct nlattr **, int, struct nlattr *,
struct nla_policy *);
extern int nla_is_nested(const struct nlattr *);
/**
* @name Attribute Construction (Exception Based)
* @{
*/
/**
* @ingroup attr
* Add unspecific attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg attrlen Length of attribute payload.
* @arg data Head of attribute payload.
*/
#define NLA_PUT(msg, attrtype, attrlen, data) \
do { \
if (nla_put(msg, attrtype, attrlen, data) < 0) \
goto nla_put_failure; \
} while(0)
/**
* @ingroup attr
* Add atomic type attribute to netlink message.
* @arg msg Netlink message.
* @arg type Atomic type.
* @arg attrtype Attribute type.
* @arg value Head of attribute payload.
*/
#define NLA_PUT_TYPE(msg, type, attrtype, value) \
do { \
type __tmp = value; \
NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \
} while(0)
/**
* Add 8 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U8(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint8_t, attrtype, value)
/**
* Add 16 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U16(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint16_t, attrtype, value)
/**
* Add 32 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_S32(msg, attrtype, value) \
NLA_PUT_TYPE(msg, int32_t, attrtype, value)
/**
* Add 32 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U32(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint32_t, attrtype, value)
/**
* Add 64 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U64(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint64_t, attrtype, value)
/**
* Add string attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value NUL terminated character string.
*/
#define NLA_PUT_STRING(msg, attrtype, value) \
NLA_PUT(msg, attrtype, (int) strlen(value) + 1, value)
/**
* Add flag attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
*/
#define NLA_PUT_FLAG(msg, attrtype) \
NLA_PUT(msg, attrtype, 0, NULL)
/**
* Add msecs attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg msecs Numeric value in micro seconds.
*/
#define NLA_PUT_MSECS(msg, attrtype, msecs) \
NLA_PUT_U64(msg, attrtype, msecs)
/**
* Add address attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg addr Abstract address object.
*/
#define NLA_PUT_ADDR(msg, attrtype, addr) \
NLA_PUT(msg, attrtype, nl_addr_get_len(addr), \
nl_addr_get_binary_addr(addr))
/**
* Add abstract data attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg data Abstract data object.
*/
#define NLA_PUT_DATA(msg, attrtype, data) \
NLA_PUT(msg, attrtype, nl_data_get_size(data), \
nl_data_get(data))
/** @} */
/**
* @name Iterators
* @{
*/
/**
* @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)))
/**
* @ingroup attr
* Iterate over a stream of nested attributes
* @arg pos loop counter, set to current attribute
* @arg nla attribute containing the nested attributes
* @arg rem initialized to len, holds bytes currently remaining in stream
*/
#define nla_for_each_nested(pos, nla, rem) \
for (pos = nla_data(nla), rem = nla_len(nla); \
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
/** @} */
#ifdef __cplusplus
}
#endif
#endif