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279 lines
8.3 KiB
Groff
279 lines
8.3 KiB
Groff
.\" Copyright (c) 2000 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 13, 2012
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.Dt NG_ONE2MANY 4
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.Os
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.Sh NAME
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.Nm ng_one2many
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.Nd packet multiplexing netgraph node type
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.Sh SYNOPSIS
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.In sys/types.h
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.In netgraph/ng_one2many.h
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.Sh DESCRIPTION
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The
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.Nm one2many
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provides a simple mechanism for routing packets over several links
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in a one-to-many (and in the reverse direction, many-to-one) fashion.
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There is a single hook named
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.Dv one ,
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and multiple hooks named
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.Dv many0 ,
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.Dv many1 ,
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etc.
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Packets received on any of the
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.Dv many
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hooks are forwarded out the
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.Dv one
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hook.
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Packets received on the
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.Dv one
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hook are forwarded out one or more of the
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.Dv many
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hooks; which hook(s) is determined by the node's configured
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transmit algorithm.
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Packets are not altered in any way.
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.Pp
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Each of the connected many links may be considered to be up or down.
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Packets are never delivered out a many hook that is down.
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How a link is determined to be up or down depends on the node's
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configured link failure detection algorithm.
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.Pp
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Before an interface or link can be plumbed into a group, its status
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must be marked as being
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.Dq up .
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This is normally setup during the initial boot stages by
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.Xr rc.conf 5 .
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It is also possible to change an interface's status to
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.Dq up
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by using the
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.Xr ifconfig 8
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utility.
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.Sh TRANSMIT ALGORITHMS
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.Bl -tag -width foo
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.It Dv NG_ONE2MANY_XMIT_ROUNDROBIN
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Packets are delivered out the many hooks in sequential order.
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Each packet goes out on a different
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.Dv many
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hook.
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.It Dv NG_ONE2MANY_XMIT_ALL
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Packets are delivered out all the
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.Dv many
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hooks.
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Each packet goes out each
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.Dv many
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hook.
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.It Dv NG_ONE2MANY_XMIT_FAILOVER
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Packets are delivered out the first active
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.Dv many
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hook.
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.El
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.Pp
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In the future other algorithms may be added as well.
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.Sh LINK FAILURE DETECTION
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The node distinguishes between active and failed links.
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Data is sent only to active links.
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The following link failure detection algorithms are available:
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.Bl -tag -width foo
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.It Dv NG_ONE2MANY_FAIL_MANUAL
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The node is explicitly told which of the links are up via the
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.Dv NGM_ONE2MANY_SET_CONFIG
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control message (see below).
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Newly connected links are down until configured otherwise.
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.It Dv NG_ONE2MANY_FAIL_NOTIFY
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The node listens to flow control message from
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.Va many
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hooks, and considers link failed if
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.Dv NGM_LINK_IS_DOWN
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is received.
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If the
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.Dv NGM_LINK_IS_UP
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message is received, node considers link active.
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.El
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.Pp
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In the future other algorithms may be added as well.
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.Pp
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When all links are considered failed, node sends the
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.Dv NGM_LINK_IS_DOWN
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message towards the
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.Va one
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hook.
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When at least one link comes up, node sends the
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.Dv NGM_LINK_IS_UP
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message towards the
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.Va one
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hook.
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.Sh HOOKS
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This node type supports up to
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.Dv NG_ONE2MANY_MAX_LINKS
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hooks named
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.Dv many0 ,
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.Dv many1 ,
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etc.,
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plus a single hook named
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.Dv one .
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the
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following:
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.Bl -tag -width foo
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.It Dv NGM_ONE2MANY_SET_CONFIG Pq Ic setconfig
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Sets the node configuration using a
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.Dv "struct ng_one2many_link_config"
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as the control message argument:
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.Bd -literal
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/* Node configuration structure */
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struct ng_one2many_config {
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uint32_t xmitAlg; /* how to distribute packets */
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uint32_t failAlg; /* how to detect link failure */
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u_char enabledLinks[NG_ONE2MANY_MAX_LINKS];
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};
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.Ed
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.Pp
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Currently, the valid settings for the
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.Dv xmitAlg
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field are
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.Dv NG_ONE2MANY_XMIT_ROUNDROBIN
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(default) or
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.Dv NG_ONE2MANY_XMIT_ALL .
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The valid settings for
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.Dv failAlg
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are
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.Dv NG_ONE2MANY_FAIL_MANUAL
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(default) or
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.Dv NG_ONE2MANY_FAIL_NOTIFY .
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.It Dv NGM_ONE2MANY_GET_CONFIG Pq Ic getconfig
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Returns the current node configuration in a
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.Dv "struct ng_one2many_link_config" .
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.It Dv NGM_ONE2MANY_GET_STATS Pq Ic getstats
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This command takes a 32 bit link number as an argument and
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returns a
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.Dv "struct ng_one2many_link_stats"
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containing statistics for the corresponding
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.Dv many
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link, which may or may not be currently connected:
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.Bd -literal
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/* Statistics structure (one for each link) */
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struct ng_one2many_link_stats {
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uint64_t recvOctets; /* total octets rec'd on link */
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uint64_t recvPackets; /* total pkts rec'd on link */
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uint64_t xmitOctets; /* total octets xmit'd on link */
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uint64_t xmitPackets; /* total pkts xmit'd on link */
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uint64_t memoryFailures; /* times couldn't get mem or mbuf */
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};
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.Ed
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.Pp
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To access statistics for the
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.Dv one
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link, use the link number
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.Dv -1 .
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.It Dv NGM_ONE2MANY_CLR_STATS Pq Ic clrstats
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This command takes a 32 bit link number as an argument and
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clears the statistics for that link.
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.It Dv NGM_ONE2MANY_GETCLR_STATS Pq Ic getclrstats
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Same as
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.Dv NGM_ONE2MANY_GET_STATS ,
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but also atomically clears the statistics for the link as well.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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.Sh EXAMPLES
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The following commands will set up Ethernet interfaces
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.Dv fxp0
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to deliver packets alternating over the physical interfaces
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corresponding to networking interfaces
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.Dv fxp0
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through
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.Dv fxp3 :
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.Bd -literal
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# Plumb nodes together
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ngctl mkpeer fxp0: one2many upper one
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ngctl connect fxp0: fxp0:upper lower many0
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ngctl connect fxp1: fxp0:upper lower many1
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ngctl connect fxp2: fxp0:upper lower many2
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ngctl connect fxp3: fxp0:upper lower many3
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# Allow fxp1 through fxp3 to xmit/recv fxp0 frames
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ngctl msg fxp1: setpromisc 1
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ngctl msg fxp2: setpromisc 1
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ngctl msg fxp3: setpromisc 1
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ngctl msg fxp1: setautosrc 0
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ngctl msg fxp2: setautosrc 0
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ngctl msg fxp3: setautosrc 0
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# Configure all four links as up
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ngctl msg fxp0:upper \\
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setconfig "{ xmitAlg=1 failAlg=1 enabledLinks=[ 1 1 1 1 ] }"
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# Bring up interface
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ifconfig fxp0 192.168.1.1 netmask 0xfffffffc
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.Ed
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.Pp
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With a similar setup on a peer machine (using the address
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192.168.1.2), a point-to-point
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Ethernet connection with four times normal bandwidth is
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achieved.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_bridge 4 ,
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.Xr ng_ether 4 ,
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.Xr ng_hub 4 ,
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.Xr ifconfig 8 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.2 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm one2many
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netgraph node (with round-robin algorithm) was written by
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.An Archie Cobbs
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.Aq archie@FreeBSD.org .
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The all algorithm was added by
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.An Rogier R. Mulhuijzen
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.Aq drwilco@drwilco.net .
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.Sh BUGS
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More transmit and link failure algorithms should be supported.
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A good candidate is Cisco's Etherchannel.
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