148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
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* netlink/msg.c Netlink Messages Interface
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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) 2003-2006 Thomas Graf <tgraf@suug.ch>
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*/
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#ifndef NETLINK_MSG_H_
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#define NETLINK_MSG_H_
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#include <netlink/netlink.h>
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#include <netlink/object.h>
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#include <netlink/attr.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define NL_DONTPAD 0
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/**
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* @ingroup msg
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* @brief
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* Will cause the netlink port to be set to the port assigned to
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* the netlink icoket ust before sending the message off.
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*
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* @note Requires the use of nl_send_auto()!
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*/
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#define NL_AUTO_PORT 0
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#define NL_AUTO_PID NL_AUTO_PORT
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/**
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* @ingroup msg
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* @brief
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* May be used to refer to a sequence number which should be
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* automatically set just before sending the message off.
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*
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* @note Requires the use of nl_send_auto()!
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*/
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#define NL_AUTO_SEQ 0
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struct nl_msg;
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struct nl_tree;
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struct ucred;
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extern int nlmsg_size(int);
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extern int nlmsg_total_size(int);
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extern int nlmsg_padlen(int);
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extern void * nlmsg_data(const struct nlmsghdr *);
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extern int nlmsg_datalen(const struct nlmsghdr *);
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extern void * nlmsg_tail(const struct nlmsghdr *);
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/* attribute access */
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extern struct nlattr * nlmsg_attrdata(const struct nlmsghdr *, int);
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extern int nlmsg_attrlen(const struct nlmsghdr *, int);
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/* message parsing */
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extern int nlmsg_valid_hdr(const struct nlmsghdr *, int);
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extern int nlmsg_ok(const struct nlmsghdr *, int);
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extern struct nlmsghdr * nlmsg_next(struct nlmsghdr *, int *);
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extern int nlmsg_parse(struct nlmsghdr *, int, struct nlattr **,
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int, struct nla_policy *);
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extern struct nlattr * nlmsg_find_attr(struct nlmsghdr *, int, int);
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extern int nlmsg_validate(struct nlmsghdr *, int, int,
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struct nla_policy *);
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extern struct nl_msg * nlmsg_alloc(void);
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extern struct nl_msg * nlmsg_alloc_size(size_t);
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extern struct nl_msg * nlmsg_alloc_simple(int, int);
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extern void nlmsg_set_default_size(size_t);
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extern struct nl_msg * nlmsg_inherit(struct nlmsghdr *);
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extern struct nl_msg * nlmsg_convert(struct nlmsghdr *);
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extern void * nlmsg_reserve(struct nl_msg *, size_t, int);
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extern int nlmsg_append(struct nl_msg *, void *, size_t, int);
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extern int nlmsg_expand(struct nl_msg *, size_t);
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extern struct nlmsghdr * nlmsg_put(struct nl_msg *, uint32_t, uint32_t,
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int, int, int);
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extern struct nlmsghdr * nlmsg_hdr(struct nl_msg *);
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extern void nlmsg_get(struct nl_msg *);
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extern void nlmsg_free(struct nl_msg *);
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/* attribute modification */
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extern void nlmsg_set_proto(struct nl_msg *, int);
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extern int nlmsg_get_proto(struct nl_msg *);
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extern size_t nlmsg_get_max_size(struct nl_msg *);
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extern void nlmsg_set_src(struct nl_msg *, struct sockaddr_nl *);
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extern struct sockaddr_nl *nlmsg_get_src(struct nl_msg *);
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extern void nlmsg_set_dst(struct nl_msg *, struct sockaddr_nl *);
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extern struct sockaddr_nl *nlmsg_get_dst(struct nl_msg *);
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extern void nlmsg_set_creds(struct nl_msg *, struct ucred *);
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extern struct ucred * nlmsg_get_creds(struct nl_msg *);
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extern char * nl_nlmsgtype2str(int, char *, size_t);
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extern int nl_str2nlmsgtype(const char *);
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extern char * nl_nlmsg_flags2str(int, char *, size_t);
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extern int nl_msg_parse(struct nl_msg *,
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void (*cb)(struct nl_object *, void *),
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void *);
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extern void nl_msg_dump(struct nl_msg *, FILE *);
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/**
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* @name Iterators
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* @{
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*/
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/**
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* @ingroup msg
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* Iterate over a stream of attributes in a message
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* @arg pos loop counter, set to current attribute
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* @arg nlh netlink message header
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* @arg hdrlen length of family header
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* @arg rem initialized to len, holds bytes currently remaining in stream
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*/
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#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
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nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
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nlmsg_attrlen(nlh, hdrlen), rem)
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/**
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* Iterate over a stream of messages
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* @arg pos loop counter, set to current message
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* @arg head head of message stream
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* @arg len length of message stream
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*/
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#define nlmsg_for_each(pos, head, len) \
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for (int rem = len, pos = head; \
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nlmsg_ok(pos, rem); \
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pos = nlmsg_next(pos, &rem))
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#define nlmsg_for_each_msg(pos, head, len, rem) \
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nlmsg_for_each(pos, head, len)
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif
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