228 lines
7.3 KiB
Groff
228 lines
7.3 KiB
Groff
.\" Copyright (c) 2000 Whistle Communications, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Subject to the following obligations and disclaimer of warranty, use and
|
|
.\" redistribution of this software, in source or object code forms, with or
|
|
.\" without modifications are expressly permitted by Whistle Communications;
|
|
.\" provided, however, that:
|
|
.\" 1. Any and all reproductions of the source or object code must include the
|
|
.\" copyright notice above and the following disclaimer of warranties; and
|
|
.\" 2. No rights are granted, in any manner or form, to use Whistle
|
|
.\" Communications, Inc. trademarks, including the mark "WHISTLE
|
|
.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
.\" such appears in the above copyright notice or in the software.
|
|
.\"
|
|
.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
|
|
.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
|
|
.\" OF SUCH DAMAGE.
|
|
.\"
|
|
.\" Author: Archie Cobbs <archie@FreeBSD.org>
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 26, 2001
|
|
.Dt NG_ONE2MANY 4
|
|
.Os FreeBSD
|
|
.Sh NAME
|
|
.Nm ng_one2many
|
|
.Nd packet multiplexing netgraph node type
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <netgraph/ng_one2many.h>
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm one2many
|
|
provides a simple mechanism for routing packets over several links
|
|
in a one-to-many (and in the reverse direction, many-to-one) fashion.
|
|
There is a single hook named
|
|
.Dv one ,
|
|
and multiple hooks named
|
|
.Dv many0 ,
|
|
.Dv many1 ,
|
|
etc.
|
|
Packets received on any of the
|
|
.Dv many
|
|
hooks are forwarded out the
|
|
.Dv one
|
|
hook.
|
|
Packets received on the
|
|
.Dv one
|
|
hook are forwarded out one or more of the
|
|
.Dv many
|
|
hooks; which hook(s) is determined by the node's configured
|
|
transmit algorithm.
|
|
Packets are not altered in any way.
|
|
.Pp
|
|
Each of the connected many links may be considered to be up or down.
|
|
Packets are never delivered out a many hook that is down.
|
|
How a link is determined to be up or down depends on the node's
|
|
configured link failure detection algorithm.
|
|
.Sh TRANSMIT ALGORITHMS
|
|
.Bl -tag -width foo
|
|
.It NG_ONE2MANY_XMIT_ROUNDROBIN
|
|
Packets are delivered out the many hooks in sequential order.
|
|
Each packet goes out on a different
|
|
.Dv many
|
|
hook.
|
|
.It NG_ONE2MANY_XMIT_ALL
|
|
Packets are delivered out all the
|
|
.Dv many
|
|
hooks. Each packet goes out each
|
|
.Dv many
|
|
hook.
|
|
.El
|
|
.Pp
|
|
In the future other algorithms may be added as well.
|
|
.Sh LINK FAILURE DETECTION
|
|
At this time, the only algorithm for determining when a link
|
|
has failed, other than the hook being disconnected, is the
|
|
``manual'' algorithm: the node is explicitly told which of
|
|
the links are up via the
|
|
.Dv NGM_ONE2MANY_SET_CONFIG
|
|
control message (see below).
|
|
Newly connected links are down until configured otherwise.
|
|
.Pp
|
|
In the future other algorithms may be added as well.
|
|
.Sh HOOKS
|
|
This node type supports up to
|
|
.Dv NG_ONE2MANY_MAX_LINKS
|
|
hooks named
|
|
.Dv many0 ,
|
|
.Dv many1 ,
|
|
etc.,
|
|
plus a single hook named
|
|
.Dv one .
|
|
.Sh CONTROL MESSAGES
|
|
This node type supports the generic control messages, plus the
|
|
following:
|
|
.Bl -tag -width foo
|
|
.It Dv NGM_ONE2MANY_SET_CONFIG
|
|
Sets the node configuration using a
|
|
.Dv "struct ng_one2many_link_config"
|
|
as the control message argument:
|
|
.Bd -literal -offset 0n
|
|
/* Node configuration structure */
|
|
struct ng_one2many_config {
|
|
u_int32_t xmitAlg; /* how to distribute packets */
|
|
u_int32_t failAlg; /* how to detect link failure */
|
|
u_char enabledLinks[NG_ONE2MANY_MAX_LINKS];
|
|
};
|
|
.Ed
|
|
.Pp
|
|
Currently, the only valid setting for the
|
|
.Dv xmitAlg
|
|
field is
|
|
.Dv NG_ONE2MANY_XMIT_ROUNDROBIN ;
|
|
this is also the default setting.
|
|
The only valid setting for
|
|
.Dv failAlg
|
|
is
|
|
.Dv NG_ONE2MANY_FAIL_MANUAL ;
|
|
this is also the default setting.
|
|
.It Dv NGM_ONE2MANY_GET_CONFIG
|
|
Returns the current node configuration in a
|
|
.Dv "struct ng_one2many_link_config" .
|
|
.It Dv NGM_ONE2MANY_GET_STATS
|
|
This command takes a 32 bit link number as an argument and
|
|
returns a
|
|
.Dv "struct ng_one2many_link_stats"
|
|
containing statistics for the corresponding
|
|
.Dv many
|
|
link, which may or may not be currently connected:
|
|
.Bd -literal -offset 0n
|
|
/* Statistics structure (one for each link) */
|
|
struct ng_one2many_link_stats {
|
|
u_int64_t recvOctets; /* total octets rec'd on link */
|
|
u_int64_t recvPackets; /* total pkts rec'd on link */
|
|
u_int64_t xmitOctets; /* total octets xmit'd on link */
|
|
u_int64_t xmitPackets; /* total pkts xmit'd on link */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
To access statistics for the
|
|
.Dv one
|
|
link, use the link number
|
|
.Dv -1 .
|
|
.It Dv NGM_ONE2MANY_CLR_STATS
|
|
This command takes a 32 bit link number as an argument and
|
|
clears the statistics for that link.
|
|
.It Dv NGM_ONE2MANY_GETCLR_STATS
|
|
Same as
|
|
.Dv NGM_ONE2MANY_GET_STATS ,
|
|
but also atomically clears the statistics for the link as well.
|
|
.El
|
|
.Sh SHUTDOWN
|
|
This node shuts down upon receipt of a
|
|
.Dv NGM_SHUTDOWN
|
|
control message, or when all hooks have been disconnected.
|
|
.Sh EXAMPLES
|
|
The following commands will set up Ethernet interfaces
|
|
.Dv fxp0
|
|
to deliver packets alternating over the physical interfaces
|
|
corresponding to networking interfaces
|
|
.Dv fxp0
|
|
through
|
|
.Dv fxp3 :
|
|
.Bd -literal -offset 0n
|
|
# Plumb nodes together
|
|
ngctl mkpeer fxp0: one2many upper one
|
|
ngctl connect fxp0: fxp0:upper lower many0
|
|
ngctl connect fxp1: fxp0:upper lower many1
|
|
ngctl connect fxp2: fxp0:upper lower many2
|
|
ngctl connect fxp3: fxp0:upper lower many3
|
|
# Allow fxp1 through fxp3 to xmit/recv fxp0 frames
|
|
ngctl msg fxp1: setpromisc 1
|
|
ngctl msg fxp3: setpromisc 1
|
|
ngctl msg fxp2: setpromisc 1
|
|
ngctl msg fxp1: setautosrc 0
|
|
ngctl msg fxp3: setautosrc 0
|
|
ngctl msg fxp2: setautosrc 0
|
|
# Configure all four links as up
|
|
ngctl msg fxp0:upper \\
|
|
setconfig "{ xmitAlg=1 failAlg=1 enabledLinks=[ 1 1 1 1 ] }"
|
|
# Bring up interface
|
|
ifconfig fxp0 192.168.1.1 netmask 0xfffffffc
|
|
.Ed
|
|
.Pp
|
|
With a similar setup on a peer machine (using the address
|
|
192.168.1.2), a point-to-point
|
|
Ethernet connection with four times normal bandwidth is
|
|
achieved.
|
|
.Sh BUGS
|
|
More transmit and link failure algorithms should be supported.
|
|
A good candidate is Cisco's Etherchannel.
|
|
.Sh SEE ALSO
|
|
.Xr netgraph 4 ,
|
|
.Xr ng_bridge 4 ,
|
|
.Xr ng_ether 4 ,
|
|
.Xr ngctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
node type was implemented in
|
|
.Fx 4.2 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm one2many
|
|
netgraph node (with round-robin algorithm) was written by
|
|
.An Archie Cobbs
|
|
.Aq archie@FreeBSD.org .
|
|
The all algorithm was added by
|
|
.An Rogier R. Mulhuijzen
|
|
.Aq drwilco@drwilco.net .
|