4da6679580
referencing an omitted example, include a short (Perl) example that queues an ICMP Echo message.
303 lines
8.1 KiB
Groff
303 lines
8.1 KiB
Groff
.\" Copyright 2002-2006 Sandvine 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 Sandvine Inc.; provided,
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.\" 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 Sandvine Inc.
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.\" trademarks, including the mark "SANDVINE" on advertising, endorsements,
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.\" or otherwise except as such appears in the above copyright notice or in
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.\" the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM
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.\" EXTENT PERMITTED BY LAW, SANDVINE MAKES NO REPRESENTATIONS OR WARRANTIES,
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.\" EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, INCLUDING WITHOUT LIMITATION,
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.\" ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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.\" PURPOSE, OR NON-INFRINGEMENT. SANDVINE DOES NOT WARRANT, GUARANTEE, OR
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.\" MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE
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.\" USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY
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.\" OR OTHERWISE. IN NO EVENT SHALL SANDVINE 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 SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH
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.\" DAMAGE.
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.\"
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.\" Author: Dave Chapeskie <dchapeskie@sandvine.com>
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.\" $FreeBSD$
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.\"
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.Dd October 22, 2006
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.Dt NG_SOURCE 4
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.Os
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.Sh NAME
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.Nm ng_source
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.Nd netgraph node for traffic generation
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.Sh SYNOPSIS
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.In sys/types.h
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.In netgraph/ng_source.h
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.Sh DESCRIPTION
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The
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.Nm source
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node acts as a source of packets according to the parameters set up
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using control messages and input packets.
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The
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.Nm
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node type is used primarily for testing and benchmarking.
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.Sh HOOKS
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The
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.Nm source
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node has two hooks:
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.Va input
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and
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.Va output .
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The
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.Va output
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hook must remain connected, its disconnection will shutdown the node.
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.Sh OPERATION
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The operation of the node is as follows.
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Packets received on the
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.Va input
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hook are queued internally.
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When
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.Va output
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hook is connected,
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.Nm
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node assumes that its neighbour node is of
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.Xr ng_ether 4
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node type.
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The neighbour is queried for its interface name.
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The
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.Nm
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node then uses queue of the interface for its evil purposes.
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The
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.Nm
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node also disables
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.Va autosrc
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option on neighbour
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.Xr ng_ether 4
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node.
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If interface name cannot be obtained automatically, it should
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be configured explicitly with the
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.Dv NGM_SOURCE_SETIFACE
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control message, and
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.Va autosrc
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should be turned off on
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.Xr ng_ether 4
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node manually.
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.Pp
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Once interface is configured, upon receipt of a
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.Dv NGM_SOURCE_START
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control message the node starts sending
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the previously queued packets out the
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.Va output
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hook on every clock tick as fast
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as the connected interface will take them.
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While active, on every clock tick the node checks the available space
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in the interface queue and sends that many packets out its
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.Va output
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hook.
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Once the number of packets indicated in the start message has been
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sent, or upon receipt of a
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.Dv NGM_SOURCE_STOP
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message, the node stops sending data.
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages as well as the following,
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which must be sent with the
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.Dv NGM_SOURCE_COOKIE
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attached.
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.Bl -tag -width indent
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.It Dv NGM_SOURCE_GET_STATS Pq Ic getstats
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Returns a structure containing the following fields:
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.Bl -tag -width indent
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.It Va outOctets
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The number of octets/bytes sent out the
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.Va output
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hook.
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.It Va outFrames
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The number of frames/packets sent out the
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.Va output
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hook.
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.It Va queueOctets
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The number of octets queued from the
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.Va input
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hook.
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.It Va queueFrames
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The number of frames queued from the
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.Va input
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hook.
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.It Va startTime
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The time the last start message was received.
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.It Va endTime
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The time the last end message was received or
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the output packet count was reached.
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.It Va elapsedTime
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Either
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.Va endTime Li \- Va startTime
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or current time
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\-
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.Va startTime .
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.El
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.It Dv NGM_SOURCE_CLR_STATS Pq Ic clrstats
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Clears and resets the statistics returned by
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.Ic getstats
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(except
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.Va queueOctets
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and
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.Va queueFrames ) .
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.It Dv NGM_SOURCE_GETCLR_STATS Pq Ic getclrstats
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As
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.Ic getstats
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but clears the statistics at the same time.
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.It Dv NGM_SOURCE_START Pq Ic start
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This message requires a single
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.Vt uint64_t
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parameter which is the number of packets to
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send before stopping.
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Node starts sending the queued packets out the
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.Va output
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hook.
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The
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.Va output
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hook must be connected and node must have
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interface configured.
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.It Dv NGM_SOURCE_STOP Pq Ic stop
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Stops the node if it is active.
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.It Dv NGM_SOURCE_CLR_DATA Pq Ic clrdata
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Clears the packets queued from the
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.Va input
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hook.
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.It Dv NGM_SOURCE_SETIFACE Pq Ic setiface
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This message requires the name of the interface
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to be configured as an argument.
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.It Dv NGM_SOURCE_SETPPS Pq Ic setpps
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This message requires a single
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.Vt uint32_t
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parameter which puts upper limit on the amount of packets
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sent per second.
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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, when all hooks have been disconnected, or when the
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.Va output
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hook has been disconnected.
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.Sh EXAMPLES
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Attach the node to an
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.Xr ng_ether 4
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node for an interface.
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If
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.Nm ng_ether
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is
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not already loaded you will need to do so.
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For example, these commands
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load the
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.Nm ng_ether
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module and attach the
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.Va output
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hook of a new
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.Nm source
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node to
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.Va orphans
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hook of the
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.Li bge0:
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.Nm ng_ether
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node.
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.Bd -literal -offset indent
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kldload ng_ether
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ngctl mkpeer bge0: source orphans output
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.Ed
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.Pp
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At this point the new node can be referred to as
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.Dq Li bge0:orphans .
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The
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node can be given its own name like this:
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.Pp
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.Dl "ngctl name bge0:orphans src0"
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.Pp
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After which it can be referred to as
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.Dq Li src0: .
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.Pp
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Once created, packets can be sent to the node as raw binary data.
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Each packet must be delivered in a separate netgraph message.
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.Pp
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The following example uses a short Perl script to convert the hex
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representation of an ICMP packet to binary and deliver it to the
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.Nm source
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node's
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.Va input
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hook via
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.Xr nghook 8 :
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.Bd -literal -offset indent
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perl -pe 's/(..)[ \et\en]*/chr(hex($1))/ge' <<EOF | nghook src0: input
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ff ff ff ff ff ff 00 00 00 00 00 00 08 00 45 00
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00 54 cb 13 00 00 40 01 b9 87 c0 a8 2b 65 0a 00
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00 01 08 00 f8 d0 c9 76 00 00 45 37 01 73 00 01
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04 0a 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15
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16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25
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26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 34 35
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36 37
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EOF
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.Ed
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.Pp
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To check that the node has queued these packets you can get the node
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statistics:
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.Bd -literal -offset indent
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ngctl msg bge0:orphans getstats
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Args: { queueOctets=64 queueFrames=1 }
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.Ed
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.Pp
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Send as many packets as required out the
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.Va output
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hook:
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.Pp
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.Dl "ngctl msg bge0:orphans start 16"
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.Pp
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Either wait for them to be sent (periodically fetching stats if desired)
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or send the stop message:
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.Pp
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.Dl "ngctl msg bge0:orphans stop"
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.Pp
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Check the statistics (here we use
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.Ic getclrstats
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to also clear the statistics):
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.Bd -literal -offset indent
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ngctl msg bge0:orphans getclrstats
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Args: { outOctets=1024 outFrames=16 queueOctets=64 queueFrames=1
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startTime={ tv_sec=1035305880 tv_usec=758036 } endTime={ tv_sec=1035305880
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tv_usec=759041 } elapsedTime={ tv_usec=1005 } }
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.Ed
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.Pp
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The times are from
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.Vt "struct timeval" Ns s ,
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the
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.Va tv_sec
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field is seconds since
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the Epoch and can be converted into a date string via TCL's [clock
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format] or via the
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.Xr date 1
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command:
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.Bd -literal -offset indent
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date -r 1035305880
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Tue Oct 22 12:58:00 EDT 2002
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.Ed
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_echo 4 ,
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.Xr ng_hole 4 ,
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.Xr ng_tee 4 ,
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.Xr ngctl 8 ,
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.Xr nghook 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 4.8 .
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.Sh AUTHORS
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.An Dave Chapeskie Aq dchapeskie@SANDVINE.com
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