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727 lines
17 KiB
C
727 lines
17 KiB
C
/*
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* netlink/attr.h Netlink Attributes
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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*/
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#ifndef NETLINK_ATTR_H_
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#define NETLINK_ATTR_H_
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#include <netlink/netlink.h>
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#include <netlink/object.h>
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#include <netlink/addr.h>
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#include <netlink/data.h>
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#include <netlink/msg.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct nl_msg;
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/**
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* @name Basic Attribute Data Types
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* @{
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*/
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/**
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* @ingroup attr
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* Basic attribute data types
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*
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* See \ref attr_datatypes for more details.
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*/
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enum {
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NLA_UNSPEC, /**< Unspecified type, binary data chunk */
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NLA_U8, /**< 8 bit integer */
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NLA_U16, /**< 16 bit integer */
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NLA_U32, /**< 32 bit integer */
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NLA_U64, /**< 64 bit integer */
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NLA_STRING, /**< NUL terminated character string */
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NLA_FLAG, /**< Flag */
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NLA_MSECS, /**< Micro seconds (64bit) */
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NLA_NESTED, /**< Nested attributes */
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__NLA_TYPE_MAX,
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};
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#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
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/** @} */
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/**
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* @ingroup attr
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* Attribute validation policy.
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*
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* See \ref attr_datatypes for more details.
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*/
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struct nla_policy {
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/** Type of attribute or NLA_UNSPEC */
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uint16_t type;
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/** Minimal length of payload required */
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uint16_t minlen;
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/** Maximal length of payload allowed */
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uint16_t maxlen;
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};
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/* Attribute parsing */
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extern int nla_ok(const struct nlattr *, int);
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extern struct nlattr * nla_next(const struct nlattr *, int *);
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extern int nla_parse(struct nlattr **, int, struct nlattr *,
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int, struct nla_policy *);
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extern int nla_validate(struct nlattr *, int, int,
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struct nla_policy *);
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extern struct nlattr * nla_find(struct nlattr *, int, int);
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/* Unspecific attribute */
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extern struct nlattr * nla_reserve(struct nl_msg *, int, int);
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extern int nla_put(struct nl_msg *, int, int, const void *);
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/**
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* nlmsg_find_attr - find a specific attribute in a netlink message
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* @arg nlh netlink message header
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* @arg hdrlen length of familiy specific header
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* @arg attrtype type of attribute to look for
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*
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* Returns the first attribute which matches the specified type.
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*/
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static inline struct nlattr *nlmsg_find_attr(struct nlmsghdr *nlh, int hdrlen, int attrtype)
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{
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return nla_find(nlmsg_attrdata(nlh, hdrlen),
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nlmsg_attrlen(nlh, hdrlen), attrtype);
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}
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/**
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* Return size of attribute whithout padding.
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* @arg payload Payload length of attribute.
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*
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* @code
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* <-------- nla_attr_size(payload) --------->
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* +------------------+- - -+- - - - - - - - - +- - -+
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* | Attribute Header | Pad | Payload | Pad |
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* +------------------+- - -+- - - - - - - - - +- - -+
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* @endcode
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*
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* @return Size of attribute in bytes without padding.
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*/
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static inline int nla_attr_size(int payload)
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{
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return NLA_HDRLEN + payload;
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}
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/**
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* Return size of attribute including padding.
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* @arg payload Payload length of attribute.
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*
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* @code
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* <----------- nla_total_size(payload) ----------->
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* +------------------+- - -+- - - - - - - - - +- - -+
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* | Attribute Header | Pad | Payload | Pad |
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* +------------------+- - -+- - - - - - - - - +- - -+
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* @endcode
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*
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* @return Size of attribute in bytes.
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*/
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static inline int nla_total_size(int payload)
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{
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return NLA_ALIGN(nla_attr_size(payload));
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}
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/**
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* Return length of padding at the tail of the attribute.
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* @arg payload Payload length of attribute.
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*
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* @code
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* +------------------+- - -+- - - - - - - - - +- - -+
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* | Attribute Header | Pad | Payload | Pad |
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* +------------------+- - -+- - - - - - - - - +- - -+
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* <--->
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* @endcode
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*
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* @return Length of padding in bytes.
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*/
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static inline int nla_padlen(int payload)
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{
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return nla_total_size(payload) - nla_attr_size(payload);
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}
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/**
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* Return type of the attribute.
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* @arg nla Attribute.
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*
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* @return Type of attribute.
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*/
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static inline int nla_type(const struct nlattr *nla)
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{
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return nla->nla_type & NLA_TYPE_MASK;
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}
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/**
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* Return pointer to the payload section.
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* @arg nla Attribute.
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*
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* @return Pointer to start of payload section.
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*/
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static inline void *nla_data(const struct nlattr *nla)
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{
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return (char *) nla + NLA_HDRLEN;
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}
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/**
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* Return length of the payload .
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* @arg nla Attribute
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*
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* @return Length of payload in bytes.
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*/
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static inline int nla_len(const struct nlattr *nla)
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{
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return nla->nla_len - NLA_HDRLEN;
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}
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/**
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* Copy attribute payload to another memory area.
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* @arg dest Pointer to destination memory area.
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* @arg src Attribute
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* @arg count Number of bytes to copy at most.
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*
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* Note: The number of bytes copied is limited by the length of
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* the attribute payload.
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*
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* @return The number of bytes copied to dest.
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*/
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static inline int nla_memcpy(void *dest, struct nlattr *src, int count)
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{
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int minlen;
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if (!src)
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return 0;
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minlen = min_t(int, count, nla_len(src));
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memcpy(dest, nla_data(src), minlen);
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return minlen;
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}
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/**
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* Add abstract data as unspecific attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg data Abstract data object.
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*
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* Equivalent to nla_put() except that the length of the payload is
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* derived from the abstract data object.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_data(struct nl_msg *msg, int attrtype, struct nl_data *data)
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{
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return nla_put(msg, attrtype, nl_data_get_size(data),
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nl_data_get(data));
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}
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/**
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* Add abstract address as unspecific attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg addr Abstract address object.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_addr(struct nl_msg *msg, int attrtype, struct nl_addr *addr)
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{
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return nla_put(msg, attrtype, nl_addr_get_len(addr),
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nl_addr_get_binary_addr(addr));
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}
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/** @} */
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/**
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* @name Integer Attributes
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*/
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/**
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* Add 8 bit integer attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg value Numeric value to store as payload.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_u8(struct nl_msg *msg, int attrtype, uint8_t value)
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{
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return nla_put(msg, attrtype, sizeof(uint8_t), &value);
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}
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/**
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* Return value of 8 bit integer attribute.
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* @arg nla 8 bit integer attribute
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*
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* @return Payload as 8 bit integer.
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*/
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static inline uint8_t nla_get_u8(struct nlattr *nla)
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{
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return *(uint8_t *) nla_data(nla);
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}
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/**
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* Add 16 bit integer attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg value Numeric value to store as payload.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_u16(struct nl_msg *msg, int attrtype, uint16_t value)
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{
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return nla_put(msg, attrtype, sizeof(uint16_t), &value);
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}
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/**
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* Return payload of 16 bit integer attribute.
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* @arg nla 16 bit integer attribute
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*
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* @return Payload as 16 bit integer.
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*/
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static inline uint16_t nla_get_u16(struct nlattr *nla)
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{
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return *(uint16_t *) nla_data(nla);
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}
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/**
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* Add 32 bit integer attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg value Numeric value to store as payload.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_u32(struct nl_msg *msg, int attrtype, uint32_t value)
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{
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return nla_put(msg, attrtype, sizeof(uint32_t), &value);
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}
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/**
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* Return payload of 32 bit integer attribute.
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* @arg nla 32 bit integer attribute.
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*
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* @return Payload as 32 bit integer.
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*/
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static inline uint32_t nla_get_u32(struct nlattr *nla)
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{
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return *(uint32_t *) nla_data(nla);
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}
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/**
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* Add 64 bit integer attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg value Numeric value to store as payload.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_u64(struct nl_msg *msg, int attrtype, uint64_t value)
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{
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return nla_put(msg, attrtype, sizeof(uint64_t), &value);
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}
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/**
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* Return payload of u64 attribute
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* @arg nla u64 netlink attribute
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*
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* @return Payload as 64 bit integer.
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*/
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static inline uint64_t nla_get_u64(struct nlattr *nla)
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{
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uint64_t tmp;
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nla_memcpy(&tmp, nla, sizeof(tmp));
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return tmp;
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}
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/**
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* Add string attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg str NUL terminated string.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_string(struct nl_msg *msg, int attrtype, const char *str)
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{
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return nla_put(msg, attrtype, strlen(str) + 1, str);
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}
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/**
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* Return payload of string attribute.
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* @arg nla String attribute.
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*
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* @return Pointer to attribute payload.
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*/
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static inline char *nla_get_string(struct nlattr *nla)
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{
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return (char *) nla_data(nla);
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}
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static inline char *nla_strdup(struct nlattr *nla)
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{
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return strdup(nla_get_string(nla));
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}
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/** @} */
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/**
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* @name Flag Attribute
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*/
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/**
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* Add flag netlink attribute to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_flag(struct nl_msg *msg, int attrtype)
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{
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return nla_put(msg, attrtype, 0, NULL);
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}
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/**
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* Return true if flag attribute is set.
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* @arg nla Flag netlink attribute.
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*
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* @return True if flag is set, otherwise false.
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*/
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static inline int nla_get_flag(struct nlattr *nla)
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{
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return !!nla;
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}
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/** @} */
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/**
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* @name Microseconds Attribute
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*/
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/**
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* Add a msecs netlink attribute to a netlink message
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* @arg n netlink message
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* @arg attrtype attribute type
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* @arg msecs number of msecs
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*/
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static inline int nla_put_msecs(struct nl_msg *n, int attrtype, unsigned long msecs)
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{
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return nla_put_u64(n, attrtype, msecs);
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}
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/**
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* Return payload of msecs attribute
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* @arg nla msecs netlink attribute
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*
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* @return the number of milliseconds.
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*/
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static inline unsigned long nla_get_msecs(struct nlattr *nla)
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{
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return nla_get_u64(nla);
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}
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/**
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* Add nested attributes to netlink message.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type.
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* @arg nested Message containing attributes to be nested.
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*
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* Takes the attributes found in the \a nested message and appends them
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* to the message \a msg nested in a container of the type \a attrtype.
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* The \a nested message may not have a family specific header.
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*
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* @see nla_put
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_put_nested(struct nl_msg *msg, int attrtype, struct nl_msg *nested)
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{
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return nla_put(msg, attrtype, nlmsg_len(nested->nm_nlh),
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nlmsg_data(nested->nm_nlh));
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}
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/**
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* Start a new level of nested attributes.
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* @arg msg Netlink message.
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* @arg attrtype Attribute type of container.
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*
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* @return Pointer to container attribute.
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*/
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static inline struct nlattr *nla_nest_start(struct nl_msg *msg, int attrtype)
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{
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struct nlattr *start = (struct nlattr *) nlmsg_tail(msg->nm_nlh);
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if (nla_put(msg, attrtype, 0, NULL) < 0)
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return NULL;
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return start;
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}
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/**
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* Finalize nesting of attributes.
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* @arg msg Netlink message.
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* @arg start Container attribute as returned from nla_nest_start().
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*
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* Corrects the container attribute header to include the appeneded attributes.
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*
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* @return 0
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*/
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static inline int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
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{
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start->nla_len = (unsigned char *) nlmsg_tail(msg->nm_nlh) -
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(unsigned char *) start;
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return 0;
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}
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/**
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* Create attribute index based on nested attribute
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* @arg tb Index array to be filled (maxtype+1 elements).
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* @arg maxtype Maximum attribute type expected and accepted.
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* @arg nla Nested Attribute.
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* @arg policy Attribute validation policy.
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*
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* Feeds the stream of attributes nested into the specified attribute
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* to nla_parse().
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*
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* @see nla_parse
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* @return 0 on success or a negative error code.
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*/
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static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
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struct nla_policy *policy)
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{
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return nla_parse(tb, maxtype, (struct nlattr *)nla_data(nla), nla_len(nla), policy);
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}
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/**
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* Compare attribute payload with memory area.
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* @arg nla Attribute.
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* @arg data Memory area to compare to.
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* @arg size Number of bytes to compare.
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*
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* @see memcmp(3)
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* @return An integer less than, equal to, or greater than zero.
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*/
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static inline int nla_memcmp(const struct nlattr *nla, const void *data, size_t size)
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{
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int d = nla_len(nla) - size;
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if (d == 0)
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d = memcmp(nla_data(nla), data, size);
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return d;
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}
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/**
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* Compare string attribute payload with string
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* @arg nla Attribute of type NLA_STRING.
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* @arg str NUL terminated string.
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*
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* @see strcmp(3)
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* @return An integer less than, equal to, or greater than zero.
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*/
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static inline int nla_strcmp(const struct nlattr *nla, const char *str)
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{
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int len = strlen(str) + 1;
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int d = nla_len(nla) - len;
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if (d == 0)
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d = memcmp(nla_data(nla), str, len);
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return d;
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}
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/**
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* Copy string attribute payload to a buffer.
|
|
* @arg dst Pointer to destination buffer.
|
|
* @arg nla Attribute of type NLA_STRING.
|
|
* @arg dstsize Size of destination buffer in bytes.
|
|
*
|
|
* Copies at most dstsize - 1 bytes to the destination buffer.
|
|
* The result is always a valid NUL terminated string. Unlike
|
|
* strlcpy the destination buffer is always padded out.
|
|
*
|
|
* @return The length of string attribute without the terminating NUL.
|
|
*/
|
|
static inline size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
|
|
{
|
|
size_t srclen = (size_t)nla_len(nla);
|
|
char *src = (char*)nla_data(nla);
|
|
|
|
if (srclen > 0 && src[srclen - 1] == '\0')
|
|
srclen--;
|
|
|
|
if (dstsize > 0) {
|
|
size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen;
|
|
|
|
memset(dst, 0, dstsize);
|
|
memcpy(dst, src, len);
|
|
}
|
|
|
|
return srclen;
|
|
}
|
|
|
|
|
|
/**
|
|
* @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_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, 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))
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @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 = (struct nlattr *)nla_data(nla), rem = nla_len(nla); \
|
|
nla_ok(pos, rem); \
|
|
pos = nla_next(pos, &(rem)))
|
|
|
|
/** @} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|