Date: Mon, 9 Mar 2009 16:51:40 +0000 (UTC) From: Bruce M Simpson <bms@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r189584 - head/share/man/man4 Message-ID: <200903091651.n29GpecS031938@svn.freebsd.org>
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Author: bms Date: Mon Mar 9 16:51:40 2009 New Revision: 189584 URL: http://svn.freebsd.org/changeset/base/189584 Log: Add igmp(4) man page, do not connect to build yet. Added: head/share/man/man4/igmp.4 (contents, props changed) Added: head/share/man/man4/igmp.4 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man4/igmp.4 Mon Mar 9 16:51:40 2009 (r189584) @@ -0,0 +1,139 @@ +.\" +.\" Copyright (c) 2009 Bruce Simpson. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. Neither the name of the project nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd March 9, 2009 +.Dt IGMP 4 +.Os +.Sh NAME +.Nm igmp +.Nd Internet Group Management Protocol +.Sh SYNOPSIS +.In sys/types.h +.In sys/socket.h +.In netinet/in.h +.In netinet/in_systm.h +.In netinet/ip.h +.In netinet/igmp.h +.Ft int +.Fn socket AF_INET SOCK_RAW IPPROTO_IGMP +.Sh DESCRIPTION +.Tn IGMP +is a control plane protocol used by IPv4 hosts and routers to +propagate multicast group membership information. +Normally this protocol is not used directly, except by the kernel +itself, in response to multicast membership requests by user +applications. +Routing protocols may open a raw socket to directly interact with +.Nm . +.Pp +As of +.Fx 8.0 , +IGMP version 3 is implemented. +This adds support for Source-Specific Multicast (SSM), whereby +applications may communicate to upstream multicast routers that +they are only interested in receiving multicast streams from +particular sources. +.\" +.Sh SYSCTL VARIABLES +.Pp +.Bl -tag -width indent +.\" +.It net.inet.igmp.stats +This opaque read-only variable exposes the stack-wide IGMPv3 +protocol statistics to +.Xr netstat 1 . +.\" +.It net.inet.igmp.ifinfo +This opaque read-only variable exposes the per-link IGMPv3 status to +.Xr ifmcstat 8 . +.\" +.It net.inet.igmp.gsrdelay +This variable specifies the time threshold, in seconds, for processing +Group-and-Source Specific Queries (GSR). +As GSR query processing requires maintaining state on the host, +it may cause memory to be allocated, and is therefore a potential +attack point for Denial-of-Service (DoS). +If more than one GSR query is received within this threshold, +it will be dropped, to mitigate the potential for DoS. +.\" +.It net.inet.igmp.default_version +This variable controls the default version of IGMP to be used on all links. +This sysctl is normally set to 3 by default. +.\" +.It net.inet.igmp.legacysupp +If this variable is non-zero, then IGMP v1 and v2 membership reports +received on a link will be allowed to suppress the IGMP v3 state-change +reports which would otherwise be issued by this host. +This sysctl is normally enabled by default. +.\" +.It net.inet.igmp.v2enable +If this variable is non-zero, then IGMP v2 membership queries will be +processed by this host, and backwards compatibility will be enabled +until the v2 'Old Querier Present' timer expires. +This sysctl is normally enabled by default. +.\" +.It net.inet.igmp.v1enable +If this variable is non-zero, then IGMP v1 membership queries will be +processed by this host, and backwards compatibility will be enabled +until the v1 'Old Querier Present' timer expires. +This sysctl is normally enabled by default. +.\" +.It net.inet.igmp.sendlocal +If this variable is non-zero, then IGMP state-changes for groups in +the 224.0.0.0/24 link-scope prefix will be issued. +This behaviour is recommended if deploying +.Fx +in a network environment with layer 2 devices which snoop IGMP traffic +to mitigate multicast propagation throughout the network. +This sysctl is normally enabled by default. +.\" +.It net.inet.igmp.sendra +If this variable is non-zero, then IGMP v2 and v3 reports will contain +the IP Router Alert option. +This sysctl is normally enabled by default. +.\" +.It net.inet.igmp.recvifkludge +If this variable is non-zero, then received IGMP reports which contain +0.0.0.0 as their source will be rewritten to contain the subnet address. +This is useful when there are hosts on-link which have not yet been +configured with a primary IPv4 address. +This sysctl is normally enabled by default. +.\" +.El +.Sh SEE ALSO +.Xr ifmcstat 8 , +.Xr inet 4 , +.Xr multicast 4 , +.Xr netstat 1 , +.Xr sourcefilter 3 +.Sh HISTORY +The +.Nm +manual page re-appeared in +.Fx 8.0 .
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