14cf49a43SJulian Elischer.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 24cf49a43SJulian Elischer.\" All rights reserved. 34cf49a43SJulian Elischer.\" 44cf49a43SJulian Elischer.\" Subject to the following obligations and disclaimer of warranty, use and 54cf49a43SJulian Elischer.\" redistribution of this software, in source or object code forms, with or 64cf49a43SJulian Elischer.\" without modifications are expressly permitted by Whistle Communications; 74cf49a43SJulian Elischer.\" provided, however, that: 84cf49a43SJulian Elischer.\" 1. Any and all reproductions of the source or object code must include the 94cf49a43SJulian Elischer.\" copyright notice above and the following disclaimer of warranties; and 104cf49a43SJulian Elischer.\" 2. No rights are granted, in any manner or form, to use Whistle 114cf49a43SJulian Elischer.\" Communications, Inc. trademarks, including the mark "WHISTLE 124cf49a43SJulian Elischer.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 134cf49a43SJulian Elischer.\" such appears in the above copyright notice or in the software. 144cf49a43SJulian Elischer.\" 154cf49a43SJulian Elischer.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 164cf49a43SJulian Elischer.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 174cf49a43SJulian Elischer.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 184cf49a43SJulian Elischer.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 194cf49a43SJulian Elischer.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 204cf49a43SJulian Elischer.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 214cf49a43SJulian Elischer.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 224cf49a43SJulian Elischer.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 234cf49a43SJulian Elischer.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 244cf49a43SJulian Elischer.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 254cf49a43SJulian Elischer.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 264cf49a43SJulian Elischer.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 274cf49a43SJulian Elischer.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 284cf49a43SJulian Elischer.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 294cf49a43SJulian Elischer.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 304cf49a43SJulian Elischer.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 314cf49a43SJulian Elischer.\" OF SUCH DAMAGE. 324cf49a43SJulian Elischer.\" 33eddc45e7SJeroen Ruigrok van der Werven.\" Author: Archie Cobbs <archie@FreeBSD.org> 344cf49a43SJulian Elischer.\" $Whistle: ng_UI.8,v 1.4 1999/01/25 02:37:56 archie Exp $ 354cf49a43SJulian Elischer.\" 364cf49a43SJulian Elischer.Dd January 19, 1999 37bec35b9aSArchie Cobbs.Dt NG_UI 4 383d45e180SRuslan Ermilov.Os 394cf49a43SJulian Elischer.Sh NAME 404cf49a43SJulian Elischer.Nm ng_UI 414cf49a43SJulian Elischer.Nd UI netgraph node type 424cf49a43SJulian Elischer.Sh SYNOPSIS 4332eef9aeSRuslan Ermilov.In netgraph/ng_UI.h 444cf49a43SJulian Elischer.Sh DESCRIPTION 454cf49a43SJulian ElischerThe 464cf49a43SJulian Elischer.Nm UI 474cf49a43SJulian Elischernode type has two hooks, 484cf49a43SJulian Elischer.Dv upstream 494cf49a43SJulian Elischerand 504cf49a43SJulian Elischer.Dv downstream . 514cf49a43SJulian ElischerPackets received on 524cf49a43SJulian Elischer.Dv downstream 534cf49a43SJulian Elischermust have 0x03 (indicating unnumbered information) as their first byte; 545203edcdSRuslan Ermilovif not the packet is dropped. 555203edcdSRuslan ErmilovThis byte is then stripped and the 564cf49a43SJulian Elischerremainder of the packet sent out on 574cf49a43SJulian Elischer.Dv upstream . 584cf49a43SJulian Elischer.Pp 594cf49a43SJulian ElischerConversely, packets received on 604cf49a43SJulian Elischer.Dv upstream 614cf49a43SJulian Elischerwill have a 0x03 byte prepended to them before being forwarded out on the 624cf49a43SJulian Elischer.Dv downstream 634cf49a43SJulian Elischerhook. 644cf49a43SJulian Elischer.Sh HOOKS 654cf49a43SJulian ElischerThis node type supports the following hooks: 66c60bda17SJoel Dahl.Bl -tag -width ".Va downstream" 67c60bda17SJoel Dahl.It Va downstream 685203edcdSRuslan ErmilovDownstream connection. 695203edcdSRuslan ErmilovPackets on this side of the node have a 0x03 as 704cf49a43SJulian Elischertheir first byte. 71c60bda17SJoel Dahl.It Va upstream 725203edcdSRuslan ErmilovUpstream connection. 735203edcdSRuslan ErmilovPackets on this side of the node have the 744cf49a43SJulian Elischerinitial 0x03 byte stripped off. 754cf49a43SJulian Elischer.El 764cf49a43SJulian Elischer.Sh CONTROL MESSAGES 774cf49a43SJulian ElischerThis node type supports only the generic control messages. 784cf49a43SJulian Elischer.Sh SHUTDOWN 794cf49a43SJulian ElischerThis node shuts down upon receipt of a 804cf49a43SJulian Elischer.Dv NGM_SHUTDOWN 814cf49a43SJulian Elischercontrol message, or when both hooks have been disconnected. 824cf49a43SJulian Elischer.Sh SEE ALSO 834cf49a43SJulian Elischer.Xr netgraph 4 , 84bec35b9aSArchie Cobbs.Xr ngctl 8 8551291597SJulian Elischer.Sh HISTORY 8651291597SJulian ElischerThe 8751291597SJulian Elischer.Nm 8851291597SJulian Elischernode type was implemented in 8951291597SJulian Elischer.Fx 4.0 . 9051291597SJulian Elischer.Sh AUTHORS 91*6c899950SBaptiste Daroussin.An Julian Elischer Aq Mt julian@FreeBSD.org 92