libnetlink man page on ElementaryOS

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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 multicast 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 maxi‐
	      mum 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 message itself	 and  arg1  as
	      arguments.  0 as return means that the filter passed, a negative
	      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 mes‐
	      sages not destined to the local socket.  Only one message bundle
	      is  received.  If there is a 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. If there is a 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	 should	 contain raw data as received from a rtnetlink
	      socket.

       The following functions are useful to construct custom  rtnetlink  mes‐
       sages.  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
       This library is meant for internal use, use libmnl for new programs.

       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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