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Linux 2.6 - man page for libnetlink (linux section 3)

libnetlink(3)									    libnetlink(3)

NAME
       libnetlink - A library for accessing the netlink service

SYNOPSIS
       #include <asm/types.h>
       #include <libnetlink.h>
       #include <linux/netlink.h>
       #include <linux/rtnetlink.h>

       int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)

       int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)

       int rtnl_send(struct rtnl_handle *rth, char *buf, int len)

       int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)

       int rtnl_dump_filter(struct rtnl_handle *rth,
		      int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
		      void *arg1,
		      int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
		      void *arg2)

       int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
		  unsigned groups, struct nlmsghdr *answer,
		  int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
		  void *jarg)

       int rtnl_listen(struct rtnl_handle *rtnl,
		  int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
		  void *jarg)

       int rtnl_from_file(FILE *rtnl,
		  int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
		  void *jarg)

       int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)

       int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)

       int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)

       int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)

DESCRIPTION
       libnetlink provides a higher level interface to rtnetlink(7).  The read functions return 0
       on success and a negative errno on failure.  The send functions return the amount of  data
       sent, or -1 on error.

       rtnl_open
	      Open  a  rtnetlink  socket  and  save the state into the rth handle. This handle is
	      passed to all subsequent calls.  subscriptions is a bitmap of the rtnetlink  multi-
	      cast groups the socket will be a member of.

       rtnl_wilddump_request
	      Request a full dump of the type database for family addresses.  type is a rtnetlink
	      message type.

       rtnl_dump_request
	      Request a full dump of the type data buffer into buf with maximum  length  of  len.
	      type is a rtnetlink message type.

       rtnl_dump_filter
	      Receive  netlink data after a request and filter it.  The filter callback checks if
	      the received message is wanted. It gets the source address of the message, the mes-
	      sage itself and arg1 as arguments. 0 as return means that the filter passed, a neg-
	      ative value is returned by rtnl_dump_filter in case of error. NULL for filter means
	      to  not  use  a  filter.	junk is used to filter messages not destined to the local
	      socket.  Only one message bundle is received. Unless there is no	message  pending,
	      this function does not block.

       rtnl_listen
	      Receive netlink data after a request and pass it to handler.  handler is a callback
	      that gets the message source address, the message itself, and the  jarg  cookie  as
	      arguments.  It  will get called for all received messages.  Only one message bundle
	      is received. Unless there is no message pending this function does not block.

       rtnl_from_file
	      Works like rtnl_listen, but reads a netlink message bundle from the file	file  and
	      passes  the messages to handler for parsing. The file contains raw data as received
	      from a rtnetlink socket.

       The following functions are useful to construct	custom	rtnetlink  messages.  For  simple
       database  dumping with filtering it is better to use the higher level functions above. See
       rtnetlink(3) and netlink(3) on how to generate a rtnetlink message. The following  utility
       functions require a continuous buffer that already contains a netlink message header and a
       rtnetlink request.

       rtnl_send
	      Send the rtnetlink message in buf of length len to handle rth.

       addattr32
	      Add a __u32 attribute of type type and with value data to netlink message n,  which
	      is part of a buffer of length maxlen.

       addattr_l
	      Add a variable length attribute of type type and with value data and alen length to
	      netlink message n, which is part of a buffer of length maxlen.  data is copied.

       rta_addattr32
	      Initialize the rtnetlink attribute rta with a __u32 data value.

       rta_addattr32
	      Initialize the rtnetlink attribute rta with a variable length data value.

BUGS
       The functions sometimes use fprintf and exit when a  fatal  error  occurs.   This  library
       should be named librtnetlink.

AUTHORS
       netlink/rtnetlink  was designed and written by Alexey Kuznetsov.  Andi Kleen wrote the man
       page.

SEE ALSO
       netlink(7), rtnetlink(7)
       /usr/include/linux/rtnetlink.h

										    libnetlink(3)


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