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Author: Dave Chapeskie
$FreeBSD: stable/10/share/man/man4/ng_source.4 242997 2012-11-13 20:41:36Z joel $
.Dd March 1, 2007 .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 4 node type. The neighbour is queried for its interface name. The .Nm node then uses queue of the interface for its evil purposes. The .Nm node also disables .Va autosrc option on neighbour .Xr ng_ether 4 node. If interface name cannot be obtained automatically, it should be configured explicitly with the .Dv NGM_SOURCE_SETIFACE control message, and .Va autosrc should be turned off on .Xr ng_ether 4 node manually.
p Once interface is configured, upon receipt of a .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 has been sent, or upon receipt of a .Dv NGM_SOURCE_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 foo t Dv NGM_SOURCE_GET_STATS Pq Ic getstats Returns a structure containing the following fields: l -tag -width ".Va elapsedTime" t Va outOctets The number of octets/bytes sent out the .Va output hook. t Va outFrames The number of frames/packets sent out the .Va output hook. t Va queueOctets The number of octets queued from the .Va input hook. t Va queueFrames The number of frames queued from the .Va 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 .Va output hook. The .Va 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 .Va input hook. t Dv NGM_SOURCE_SETIFACE Pq Ic setiface This message requires the name of the interface to be configured as an argument. t Dv NGM_SOURCE_SETPPS Pq Ic setpps This message requires a single .Vt uint32_t parameter which puts upper limit on the amount of packets sent per second. t Dv NGM_SOURCE_SET_TIMESTAMP Pq Ic settimestamp This message specifies that a timestamp (in the format of a .Vt "struct timeval" ) should be inserted in the transmitted packets. This message requires a structure containing the following fields: l -tag -width ".Va offset" t Va offset The offset from the beginning of the packet at which the timestamp is to be inserted. t Va flags Set to 1 to enable the timestamp. .El t Dv NGM_SOURCE_GET_TIMESTAMP Pq Ic gettimestamp Returns the current timestamp settings in the form of the structure described above. t Dv NGM_SOURCE_SET_COUNTER Pq Ic setcounter This message specifies that a counter should be embedded in transmitted packets. Up to four counters may be independently configured. This message requires a structure containing the following fields: l -tag -width ".Va increment" t Va offset The offset from the beginning of the packet at which the counter is to be inserted. t Va flags Set to 1 to enable the counter. t Va width The byte width of the counter. It may be 1, 2, or 4. t Va next_val The value for the next insertion of the counter. t Va min_val The minimum value to be used by the counter. t Va max_val The maximum value to be used by the counter. t Va increment The value to be added to the counter after each insertion. It may be negative. t Va index The counter to be configured, from 0 to 3. .El t Dv NGM_SOURCE_GET_COUNTER Pq Ic getcounter This message requires a single .Vt uint8_t parameter which specifies the counter to query. Returns the current counter settings in the form of the structure described above. .El .Sh SHUTDOWN This node shuts down upon receipt of a .Dv NGM_SHUTDOWN control message, when all hooks have 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 .Va output hook of a new .Nm source node to .Va 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 can be sent to the node as raw binary data. Each packet must be delivered in a separate netgraph message.
p The following example uses a short Perl script to convert the hex representation of an ICMP packet to binary and deliver it to the .Nm source node's .Va input hook via .Xr nghook 8 : d -literal -offset indent perl -pe 's/(..)[ \et\en]*/chr(hex($1))/ge' <<EOF | nghook src0: input ff ff ff ff ff ff 00 00 00 00 00 00 08 00 45 00 00 54 cb 13 00 00 40 01 b9 87 c0 a8 2b 65 0a 00 00 01 08 00 f8 d0 c9 76 00 00 45 37 01 73 00 01 04 0a 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 34 35 36 37 EOF .Ed
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 .Va 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