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Author: Dave Chapeskie <dchapeskie@sandvine.com>
$FreeBSD: head/share/man/man4/ng_source.4 144675 2005-04-05 17:27:36Z glebius $
.Dd April 5, 2005 .Dt NG_SOURCE 4 .Os .Sh NAME .Nm ng_source .Nd netgraph node for traffic generation .Sh SYNOPSIS n sys/types.h n netgraph/ng_source.h .Sh DESCRIPTION The .Nm source node acts as a source of packets according to the parameters set up using control messages and input packets. The .Nm node type is used primarily for testing and benchmarking. .Sh HOOKS The .Nm source node has two hooks: .Va input and .Va output . The .Va output hook must remain connected, its disconnection will shutdown the node. .Sh OPERATION The operation of the node is as follows. Packets received on the .Va input hook are queued internally. When .Va output hook is connected, .Nm node assumes that its neighbour node is of .Xr ng_ether node type. The neighbor is queried for its interface name. .Nm node then uses queue of the interface for its evil purposes. .Nm node also disables .Va autosrc option on neighbour .Xr ng_ether node. If interface name can't be obtained automatically, it should be configured explicitly with help of .Dv NGM_SOURCE_SETIFACE control message, and .Va autosrc should be turned off on .Xr ng_ether node manually.
p Once interface is configured, upon receival of .Dv NGM_SOURCE_START control message the node starts sending the previously queued packets out the .Va output hook on every clock tick as fast as the connected interface will take them. While active, on every clock tick the node checks the available space in the interface queue and sends that many packets out its .Va output hook. Once the number of packets indicated in the start message have been sent, or upon reception of a stop message, the node stops sending data. .Sh CONTROL MESSAGES This node type supports the generic control messages as well as the following, which must be sent with the .Dv NGM_SOURCE_COOKIE attached. l -tag -width indent t Dv NGM_SOURCE_GET_STATS Pq Ic getstats Returns a structure containing the following fields: l -tag -width indent t Va outOctets The number of octets/bytes sent out the .Dv output hook. t Va outFrames The number of frames/packets sent out the .Dv output hook. t Va queueOctets The number of octets queued from the .Dv input hook. t Va queueFrames The number of frames queued from the .Dv input hook. t Va startTime The time the last start message was received. t Va endTime The time the last end message was received or the output packet count was reached. t Va elapsedTime Either .Va endTime Li - Va startTime or current time - .Va startTime . .El t Dv NGM_SOURCE_CLR_STATS Pq Ic clrstats Clears and resets the statistics returned by c getstats (except .Va queueOctets and .Va queueFrames ) . t Dv NGM_SOURCE_GETCLR_STATS Pq Ic getclrstats As c getstats but clears the statistics at the same time. t Dv NGM_SOURCE_START Pq Ic start This message requires a single .Vt uint64_t parameter which is the number of packets to send before stopping. Node starts sending the queued packets out the output hook. The output hook must be connected and node must have interface configured. t Dv NGM_SOURCE_STOP Pq Ic stop Stops the node if it is active. t Dv NGM_SOURCE_CLR_DATA Pq Ic clrdata Clears the packets queued from the .Dv input hook. t Dv NGM_SOURCE_SETIFACE Pq Ic setiface This message requires a string argument - name of the interface to be configured. .El .Sh SHUTDOWN This node shuts down upon receipt of a .Dv NGM_SHUTDOWN control message, when all hooks has been disconnected, or when the .Va output hook has been disconnected. .Sh EXAMPLES Attach the node to an .Xr ng_ether 4 node for an interface. If .Nm ng_ether is not already loaded you will need to do so. For example, these commands load the .Nm ng_ether module and attach the .Dv output hook of a new .Nm source node to .Dv orphans hook of the .Li bge0: .Nm ng_ether node. d -literal -offset indent kldload ng_ether ngctl mkpeer bge0: source orphans output .Ed
p At this point the new node can be referred to as .Dq Li bge0:orphans . The node can be given its own name like this:
p .Dl "ngctl name bge0:orphans src0"
p After which it can be referred to as .Dq Li src0: .
p Once created, packets need to be sent to the node, the TCL net package can be used to generate these packets:
p [Sandvine specific TCL code example omitted]
p To feed the output of the above TCL script to the .Nm source node's .Dv input hook via .Xr nghook 8 :
p .Dl "tcl genPacket | nghook bge0:orphans input"
p To check that the node has queued these packets you can get the node statistics: d -literal -offset indent ngctl msg bge0:orphans getstats Args: { queueOctets=64 queueFrames=1 } .Ed
p Send as many packets as required out the .Dv output hook:
p .Dl "ngctl msg bge0:orphans start 16"
p Either wait for them to be sent (periodically fetching stats if desired) or send the stop message:
p .Dl "ngctl msg bge0:orphans stop"
p Check the statistics (here we use c getclrstats to also clear the statistics): d -literal -offset indent ngctl msg bge0:orphans getclrstats Args: { outOctets=1024 outFrames=16 queueOctets=64 queueFrames=1 startTime={ tv_sec=1035305880 tv_usec=758036 } endTime={ tv_sec=1035305880 tv_usec=759041 } elapsedTime={ tv_usec=1005 } } .Ed
p The times are from .Vt "struct timeval" Ns s , the .Va tv_sec field is seconds since the Epoch and can be converted into a date string via TCL's [clock format] or via the .Xr date 1 command: d -literal -offset indent date -r 1035305880 Tue Oct 22 12:58:00 EDT 2002 .Ed .Sh SEE ALSO .Xr netgraph 4 , .Xr ng_echo 4 , .Xr ng_hole 4 , .Xr ng_tee 4 , .Xr ngctl 8 , .Xr nghook 8 .Sh HISTORY The .Nm node type was implemented in .Fx 4.8 . .Sh AUTHORS .An Dave Chapeskie Aq dchapeskie@SANDVINE.com