Add missing userland support files from previous commit for the new
multicast source filter API functions.
This commit is contained in:
bms
parent
294e2f4e5d
commit
9429c72430
183
lib/libc/net/sourcefilter.3
Normal file
183
lib/libc/net/sourcefilter.3
Normal file
@ -0,0 +1,183 @@
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.\" Copyright (c) 2007 Bruce M. Simpson. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Bruce M. Simpson ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL Bruce M. Simpson BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 12, 2007
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.Dt SOURCEFILTER 3
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.Os
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.Sh NAME
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.Nm sourcefilter
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.Nd advanced multicast group membership API
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.Sh SYNOPSIS
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.In sys/socket.h
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.In netinet/in.h
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.Ft int
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.Fo getipv4sourcefilter
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.Fa "int s"
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.Fa "struct in_addr interface"
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.Fa "struct in_addr group"
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.Fa "uint32_t *fmode"
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.Fa "uint32_t *numsrc"
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.Fa "struct in_addr *slist"
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.Fc
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.Ft int
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.Fo getsourcefilter
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.Fa "int s"
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.Fa "uint32_t interface"
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.Fa "struct sockaddr *group"
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.Fa "socklen_t grouplen"
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.Fa "uint32_t *fmode"
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.Fa "uint32_t *numsrc"
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.Fa "struct sockaddr_storage *slist"
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.Fc
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.Ft int
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.Fo setipv4sourcefilter
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.Fa "int s"
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.Fa "struct in_addr interface"
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.Fa "struct in_addr group"
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.Fa "uint32_t fmode"
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.Fa "uint32_t numsrc"
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.Fa "struct in_addr *slist"
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.Fc
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.Ft int
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.Fo setsourcefilter
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.Fa "int s"
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.Fa "uint32_t interface"
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.Fa "struct sockaddr *group"
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.Fa "socklen_t grouplen"
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.Fa "uint32_t fmode"
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.Fa "uint32_t numsrc"
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.Fa "struct sockaddr_storage *slist"
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.Fc
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.Sh DESCRIPTION
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The
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.Nm
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functions implement the advanced, full-state multicast API
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defined in RFC 3678.
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An application may use these functions to atomically set and
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retrieve the multicast source address filters associated with a socket
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.Fa s
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and a multicast
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.Fa group .
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.Pp
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The protocol-independent functions
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.Fn getsourcefilter
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and
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.Fn setsourcefilter
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allow an application to join a multicast group on an interface by
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passing its index for the
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.Fa interface
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argument.
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The
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argument.
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.Fa grouplen
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argument specifies the size of the structure pointed to by
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.Fa group .
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.Pp
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For the
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.Fn setipv4sourcefilter
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and
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.Fn setsourcefilter
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functions.
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the
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.Fa fmode
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argument may be used to place the socket into inclusive or exclusive
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group membership modes, by using the
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.Dv MCAST_INCLUDE
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or
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.Dv MCAST_EXCLUDE
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constants respectively.
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The
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.Fa numsrc
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argument specifies the number of source entries in the
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.Fa slist
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array.
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A value of 0 will remove all source filters from the socket.
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The changes will be communicated to IGMPv3 and/or MLDv2 routers
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on the local network as appropriate.
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.Sh IMPLEMENTATION NOTES
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The IPv4 specific versions of these functions are implemented in terms
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of the protocol-independent functions.
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Application writers are encouraged to use the protocol-independent functions
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for efficiency, and upwards compatibility with IPv6 networks.
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.Sh RETURN VALUES
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.Rv -std getsourcefilter getipv4sourcefilter setsourcefilter setipv4sourcefilter
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.Sh ERRORS
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The
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.Nm
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functions may fail because of:
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.Bl -tag -width Er
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.It Bq Er EADDRNOTAVAIL
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The network interface which the
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.Dv interface
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argument refers to was not configured in the system,
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or the system is not a member of the
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.Dv group .
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.It Bq Er EAFNOSUPPORT
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The
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.Dv group
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and/or one or more of the
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.Dv slist
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arguments were of an address family unsupported by the system,
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or the address family of the
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.Dv group
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and
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.Dv slist
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arguments were not identical.
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.It Bq Er EINVAL
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The
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.Dv group
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argument does not contain a multicast address.
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The
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.Dv fmode
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argument is invalid; it must be set to either
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.Dv MCAST_INCLUDE
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or
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.Dv MCAST_EXCLUDE .
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The
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.Dv numsrc
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or
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.Dv slist
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arguments do not specify a source list.
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.It Bq Er ENOMEM
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Insufficient memory was available to carry out the requested
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operation.
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.El
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.Sh SEE ALSO
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.Xr ip 4 ,
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.Xr ip6 4 ,
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.Xr multicast 4
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.Rs
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.%A D. Thaler
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.%A B. Fenner
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.%A B. Quinn
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.%T "Socket Interface Extensions for Multicast Source Filters"
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.%N RFC 3678
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.%D Jan 2004
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.Re
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.Sh HISTORY
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The
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.Nm
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functions first appeared in
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.Fx 7.0 .
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.Sh AUTHORS
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Bruce M. Simpson
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.Aq bms@FreeBSD.org
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404
lib/libc/net/sourcefilter.c
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404
lib/libc/net/sourcefilter.c
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@ -0,0 +1,404 @@
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/*-
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* Copyright (c) 2007 Bruce M. Simpson.
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of Bruce M. Simpson nor the names of other
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRUCE M. SIMPSON AND AFFILIATES
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRUCE M. SIMPSON OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if_dl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <assert.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <string.h>
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#include "un-namespace.h"
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/*
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* Advanced (Full-state) multicast group membership APIs [RFC3678]
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* Currently this module assumes IPv4 support (INET) in the base system.
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*/
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#ifndef INET
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#define INET
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#endif
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union sockunion {
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struct sockaddr_storage ss;
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struct sockaddr sa;
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struct sockaddr_dl sdl;
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#ifdef INET
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struct sockaddr_in sin;
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#endif
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#ifdef INET6
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struct sockaddr_in6 sin6;
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#endif
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};
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typedef union sockunion sockunion_t;
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#ifndef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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/*
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* Internal: Map an IPv4 unicast address to an interface index.
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* This is quite inefficient so it is recommended applications use
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* the newer, more portable, protocol independent API.
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*/
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static uint32_t
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__inaddr_to_index(in_addr_t ifaddr)
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{
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struct ifaddrs *ifa;
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struct ifaddrs *ifaddrs;
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char *ifname;
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int ifindex;
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sockunion_t *psu;
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if (getifaddrs(&ifaddrs) < 0)
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return (0);
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ifindex = 0;
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ifname = NULL;
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/*
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* Pass #1: Find the ifaddr entry corresponding to the
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* supplied IPv4 address. We should really use the ifindex
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* consistently for matches, however it is not available to
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* us on this pass.
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*/
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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psu = (sockunion_t *)ifa->ifa_addr;
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if (psu && psu->ss.ss_family == AF_INET &&
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psu->sin.sin_addr.s_addr == ifaddr) {
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ifname = ifa->ifa_name;
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break;
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}
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}
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if (ifname == NULL)
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goto out;
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/*
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* Pass #2: Find the index of the interface matching the name
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* we obtained from looking up the IPv4 ifaddr in pass #1.
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* There must be a better way of doing this.
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*/
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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psu = (sockunion_t *)ifa->ifa_addr;
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if (psu && psu->ss.ss_family == AF_LINK &&
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strcmp(ifa->ifa_name, ifname) == 0) {
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ifindex = psu->sdl.sdl_index;
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break;
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}
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}
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assert(ifindex != 0);
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out:
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freeifaddrs(ifaddrs);
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return (ifindex);
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}
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/*
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* Set IPv4 source filter list in use on socket.
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*
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* Stubbed to setsourcefilter(). Performs conversion of structures which
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* may be inefficient; applications are encouraged to use the
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* protocol-independent API.
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*/
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int
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setipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
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uint32_t fmode, uint32_t numsrc, struct in_addr *slist)
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{
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#ifdef INET
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sockunion_t tmpgroup;
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struct in_addr *pina;
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sockunion_t *psu, *tmpslist;
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int err;
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size_t i;
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uint32_t ifindex;
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assert(s != -1);
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tmpslist = NULL;
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if (!IN_MULTICAST(ntohl(group.s_addr)) ||
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(fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE)) {
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errno = EINVAL;
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return (-1);
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}
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ifindex = __inaddr_to_index(interface.s_addr);
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if (ifindex == 0) {
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errno = EADDRNOTAVAIL;
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return (-1);
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}
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memset(&tmpgroup, 0, sizeof(sockunion_t));
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tmpgroup.sin.sin_family = AF_INET;
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tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
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tmpgroup.sin.sin_addr = group;
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if (numsrc != 0 || slist != NULL) {
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tmpslist = calloc(numsrc, sizeof(sockunion_t));
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if (tmpslist == NULL) {
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errno = ENOMEM;
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return (-1);
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}
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pina = slist;
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psu = tmpslist;
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for (i = 0; i < numsrc; i++, pina++, psu++) {
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psu->sin.sin_family = AF_INET;
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psu->sin.sin_len = sizeof(struct sockaddr_in);
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psu->sin.sin_addr = *pina;
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}
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}
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err = setsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
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sizeof(struct sockaddr_in), fmode, numsrc,
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(struct sockaddr_storage *)tmpslist);
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if (tmpslist != NULL)
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free(tmpslist);
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return (err);
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#else /* !INET */
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return (EAFNOSUPPORT);
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#endif /* INET */
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}
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/*
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||||||
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* Get IPv4 source filter list in use on socket.
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|
*
|
||||||
|
* Stubbed to getsourcefilter(). Performs conversion of structures which
|
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|
* may be inefficient; applications are encouraged to use the
|
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* protocol-independent API.
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* An slist of NULL may be used for guessing the required buffer size.
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*/
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int
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||||||
|
getipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
|
||||||
|
uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist)
|
||||||
|
{
|
||||||
|
sockunion_t *psu, *tmpslist;
|
||||||
|
sockunion_t tmpgroup;
|
||||||
|
struct in_addr *pina;
|
||||||
|
int err;
|
||||||
|
size_t i;
|
||||||
|
uint32_t ifindex, onumsrc;
|
||||||
|
|
||||||
|
assert(s != -1);
|
||||||
|
assert(fmode != NULL);
|
||||||
|
assert(numsrc != NULL);
|
||||||
|
|
||||||
|
onumsrc = *numsrc;
|
||||||
|
*numsrc = 0;
|
||||||
|
tmpslist = NULL;
|
||||||
|
|
||||||
|
if (!IN_MULTICAST(ntohl(group.s_addr)) ||
|
||||||
|
(onumsrc != 0 && slist == NULL)) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
|
||||||
|
ifindex = __inaddr_to_index(interface.s_addr);
|
||||||
|
if (ifindex == 0) {
|
||||||
|
errno = EADDRNOTAVAIL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
|
||||||
|
memset(&tmpgroup, 0, sizeof(sockunion_t));
|
||||||
|
tmpgroup.sin.sin_family = AF_INET;
|
||||||
|
tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
|
||||||
|
tmpgroup.sin.sin_addr = group;
|
||||||
|
|
||||||
|
if (onumsrc != 0 || slist != NULL) {
|
||||||
|
tmpslist = calloc(onumsrc, sizeof(sockunion_t));
|
||||||
|
if (tmpslist == NULL) {
|
||||||
|
errno = ENOMEM;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
err = getsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
|
||||||
|
sizeof(struct sockaddr_in), fmode, numsrc,
|
||||||
|
(struct sockaddr_storage *)tmpslist);
|
||||||
|
|
||||||
|
if (tmpslist != NULL && *numsrc != 0) {
|
||||||
|
pina = slist;
|
||||||
|
psu = tmpslist;
|
||||||
|
for (i = 0; i < MIN(onumsrc, *numsrc); i++, psu++) {
|
||||||
|
if (psu->ss.ss_family != AF_INET)
|
||||||
|
continue;
|
||||||
|
*pina++ = psu->sin.sin_addr;
|
||||||
|
}
|
||||||
|
free(tmpslist);
|
||||||
|
}
|
||||||
|
|
||||||
|
return (err);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Set protocol-independent source filter list in use on socket.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
setsourcefilter(int s, uint32_t interface, struct sockaddr *group,
|
||||||
|
socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
|
||||||
|
struct sockaddr_storage *slist)
|
||||||
|
{
|
||||||
|
struct __msfilterreq msfr;
|
||||||
|
sockunion_t *psu;
|
||||||
|
int level, optname;
|
||||||
|
|
||||||
|
if (fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
|
||||||
|
psu = (sockunion_t *)group;
|
||||||
|
switch (psu->ss.ss_family) {
|
||||||
|
#ifdef INET
|
||||||
|
case AF_INET:
|
||||||
|
if ((grouplen != sizeof(struct sockaddr_in) ||
|
||||||
|
!IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
level = IPPROTO_IP;
|
||||||
|
optname = IP_MSFILTER;
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef INET6
|
||||||
|
case AF_INET6:
|
||||||
|
if (grouplen != sizeof(struct sockaddr_in6) ||
|
||||||
|
!IN6_IS_ADDR_MULTICAST(psu->sin6.sin6_addr)) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
level = IPPROTO_IPV6;
|
||||||
|
optname = IPV6_MSFILTER;
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
default:
|
||||||
|
errno = EAFNOSUPPORT;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
|
||||||
|
memset(&msfr, 0, sizeof(msfr));
|
||||||
|
msfr.msfr_ifindex = interface;
|
||||||
|
msfr.msfr_fmode = fmode;
|
||||||
|
msfr.msfr_nsrcs = numsrc;
|
||||||
|
memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
|
||||||
|
msfr.msfr_srcs = slist; /* pointer */
|
||||||
|
|
||||||
|
return (setsockopt(s, level, optname, &msfr, sizeof(msfr)));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Get protocol-independent source filter list in use on socket.
|
||||||
|
* An slist of NULL may be used for guessing the required buffer size.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
getsourcefilter(int s, uint32_t interface, struct sockaddr *group,
|
||||||
|
socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc,
|
||||||
|
struct sockaddr_storage *slist)
|
||||||
|
{
|
||||||
|
struct __msfilterreq msfr;
|
||||||
|
sockunion_t *psu;
|
||||||
|
int err, level, optlen, optname;
|
||||||
|
|
||||||
|
if (interface == 0 || group == NULL || numsrc == NULL ||
|
||||||
|
fmode == NULL) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
|
||||||
|
*numsrc = 0;
|
||||||
|
*fmode = 0;
|
||||||
|
|
||||||
|
psu = (sockunion_t *)group;
|
||||||
|
switch (psu->ss.ss_family) {
|
||||||
|
#ifdef INET
|
||||||
|
case AF_INET:
|
||||||
|
if ((grouplen != sizeof(struct sockaddr_in) ||
|
||||||
|
!IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
level = IPPROTO_IP;
|
||||||
|
optname = IP_MSFILTER;
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
#ifdef INET6
|
||||||
|
case AF_INET6:
|
||||||
|
if (grouplen != sizeof(struct sockaddr_in6) ||
|
||||||
|
!IN6_IS_ADDR_MULTICAST(psu->sin6.sin6_addr)) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return (-1);
|
||||||
|
}
|
||||||
|
level = IPPROTO_IPV6;
|
||||||
|
optname = IPV6_MSFILTER;
|
||||||
|
break;
|
||||||
|
#endif
|
||||||
|
default:
|
||||||
|
errno = EAFNOSUPPORT;
|
||||||
|
return (-1);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
optlen = sizeof(struct __msfilterreq);
|
||||||
|
memset(&msfr, 0, optlen);
|
||||||
|
msfr.msfr_ifindex = interface;
|
||||||
|
msfr.msfr_fmode = 0;
|
||||||
|
msfr.msfr_nsrcs = *numsrc;
|
||||||
|
memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* msfr_srcs is a pointer to a vector of sockaddr_storage. It
|
||||||
|
* may be NULL. The kernel will always return the total number
|
||||||
|
* of filter entries for the group in msfr.msfr_nsrcs.
|
||||||
|
*/
|
||||||
|
msfr.msfr_srcs = slist;
|
||||||
|
err = getsockopt(s, level, optname, &msfr, &optlen);
|
||||||
|
if (err == 0) {
|
||||||
|
*numsrc = msfr.msfr_nsrcs;
|
||||||
|
*fmode = msfr.msfr_fmode;
|
||||||
|
}
|
||||||
|
|
||||||
|
return (err);
|
||||||
|
}
|
||||||
Loading…
x
Reference in New Issue
Block a user