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SOURCEFILTER(3)		 BSD Library Functions Manual	       SOURCEFILTER(3)

NAME
     sourcefilter -- advanced multicast	group membership API

SYNOPSIS
     #include <sys/socket.h>
     #include <netinet/in.h>

     int
     getipv4sourcefilter(int s,	struct in_addr interface,
	 struct	in_addr	group, uint32_t	*fmode,	uint32_t *numsrc,
	 struct	in_addr	*slist);

     int
     getsourcefilter(int s, uint32_t interface,	struct sockaddr	*group,
	 socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc,
	 struct	sockaddr_storage *slist);

     int
     setipv4sourcefilter(int s,	struct in_addr interface,
	 struct	in_addr	group, uint32_t	fmode, uint32_t	numsrc,
	 struct	in_addr	*slist);

     int
     setsourcefilter(int s, uint32_t interface,	struct sockaddr	*group,
	 socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
	 struct	sockaddr_storage *slist);

DESCRIPTION
     The sourcefilter functions	implement the advanced,	full-state multicast
     API defined in RFC	3678.  An application may use these functions to atom-
     ically set	and retrieve the multicast source address filters associated
     with a socket s and a multicast group.

     The protocol-independent functions	getsourcefilter() and
     setsourcefilter() allow an	application to join a multicast	group on an
     interface by passing its index for	the interface argument.	 The argument.
     grouplen argument specifies the size of the structure pointed to by
     group.

     For the setipv4sourcefilter() and setsourcefilter() functions.  the fmode
     argument may be used to place the socket into inclusive or	exclusive
     group membership modes, by	using the MCAST_INCLUDE	or MCAST_EXCLUDE con-
     stants respectively.  The numsrc argument specifies the number of source
     entries in	the slist array.  A value of 0 will remove all source filters
     from the socket.  The changes will	be communicated	to IGMPv3 and/or MLDv2
     routers on	the local network as appropriate.

IMPLEMENTATION NOTES
     The IPv4 specific versions	of these functions are implemented in terms of
     the protocol-independent functions.  Application writers are encouraged
     to	use the	protocol-independent functions for efficiency, and upwards
     compatibility with	IPv6 networks.

RETURN VALUES
     The getsourcefilter(), getipv4sourcefilter(), setsourcefilter(), and
     setipv4sourcefilter() functions return the	value 0	if successful; other-
     wise the value -1 is returned and the global variable errno is set	to in-
     dicate the	error.

ERRORS
     The sourcefilter functions	may fail because of:

     [EADDRNOTAVAIL]	The network interface which the	interface argument
			refers to was not configured in	the system, or the
			system is not a	member of the group.

     [EAFNOSUPPORT]	The group and/or one or	more of	the slist arguments
			were of	an address family unsupported by the system,
			or the address family of the group and slist arguments
			were not identical.

     [EINVAL]		The group argument does	not contain a multicast	ad-
			dress.	The fmode argument is invalid; it must be set
			to either MCAST_INCLUDE	or MCAST_EXCLUDE.  The numsrc
			or slist arguments do not specify a source list.

     [ENOMEM]		Insufficient memory was	available to carry out the re-
			quested	operation.

SEE ALSO
     ip(4), ip6(4), multicast(4)

     D.	Thaler,	B. Fenner, and B. Quinn, Socket	Interface Extensions for
     Multicast Source Filters, RFC 3678, Jan 2004.

HISTORY
     The sourcefilter functions	first appeared in FreeBSD 7.0.

AUTHORS
     Bruce M. Simpson <bms@FreeBSD.org>

BSD				 June 12, 2007				   BSD
NAME | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | RETURN VALUES | ERRORS | SEE ALSO | HISTORY | AUTHORS

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