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/*
* netlink/msg.c Netlink Messages Interface
*
* 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) 2003-2006 Thomas Graf <tgraf@suug.ch>
*/
#ifndef NETLINK_MSG_H_
#define NETLINK_MSG_H_
#include <netlink/netlink.h>
#include <netlink/object.h>
#include <netlink/attr.h>
struct nl_msg;
struct nl_tree;
struct ucred;
/* size calculations */
extern int nlmsg_msg_size(int);
extern int nlmsg_total_size(int);
extern int nlmsg_padlen(int);
/* payload access */
extern void * nlmsg_data(const struct nlmsghdr *);
extern int nlmsg_len(const struct nlmsghdr *);
extern void * nlmsg_tail(const struct nlmsghdr *);
/* attribute access */
extern struct nlattr * nlmsg_attrdata(const struct nlmsghdr *, int);
extern int nlmsg_attrlen(const struct nlmsghdr *, int);
/* message parsing */
extern int nlmsg_ok(const struct nlmsghdr *, int);
extern struct nlmsghdr * nlmsg_next(struct nlmsghdr *, int *);
extern int nlmsg_parse(struct nlmsghdr *, int, struct nlattr **,
int, struct nla_policy *);
extern struct nlattr * nlmsg_find_attr(struct nlmsghdr *, int, int);
extern int nlmsg_validate(struct nlmsghdr *, int, int,
struct nla_policy *);
extern struct nl_msg * nlmsg_new(void);
extern struct nl_msg * nlmsg_build(struct nlmsghdr *);
extern struct nl_msg * nlmsg_build_simple(int, int);
extern struct nl_msg * nlmsg_build_no_hdr(void);
extern struct nl_msg * nlmsg_convert(struct nlmsghdr *);
extern int nlmsg_append(struct nl_msg *, void *, size_t, int);
extern struct nlmsghdr * nlmsg_hdr(struct nl_msg *);
extern void nlmsg_free(struct nl_msg *);
/* attribute modification */
extern void nlmsg_set_proto(struct nl_msg *, int);
extern int nlmsg_get_proto(struct nl_msg *);
extern void nlmsg_set_src(struct nl_msg *, struct sockaddr_nl *);
extern struct sockaddr_nl *nlmsg_get_src(struct nl_msg *);
extern void nlmsg_set_dst(struct nl_msg *, struct sockaddr_nl *);
extern struct sockaddr_nl *nlmsg_get_dst(struct nl_msg *);
extern void nlmsg_set_creds(struct nl_msg *, struct ucred *);
extern struct ucred * nlmsg_get_creds(struct nl_msg *);
extern char * nl_nlmsgtype2str(int, char *, size_t);
extern int nl_str2nlmsgtype(const char *);
extern char * nl_nlmsg_flags2str(int, char *, size_t);
extern int nl_msg_parse(struct nl_msg *,
void (*cb)(struct nl_object *, void *),
void *);
/**
* @name Iterators
* @{
*/
/**
* @ingroup msg
* Iterate over a stream of attributes in a message
* @arg pos loop counter, set to current attribute
* @arg nlh netlink message header
* @arg hdrlen length of family header
* @arg rem initialized to len, holds bytes currently remaining in stream
*/
#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
nlmsg_attrlen(nlh, hdrlen), rem)
/**
* Iterate over a stream of messages
* @arg pos loop counter, set to current message
* @arg head head of message stream
* @arg len length of message stream
* @arg rem initialized to len, holds bytes currently remaining in stream
*/
#define nlmsg_for_each_msg(pos, head, len, rem) \
for (pos = head, rem = len; \
nlmsg_ok(pos, rem); \
pos = nlmsg_next(pos, &(rem)))
/** @} */
#endif
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