1.\" $NetBSD: virt.4,v 1.2 2010/11/17 18:03:49 wiz Exp $ 2.\" 3.\" Copyright (c) 2010 Antti Kantee 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd November 15, 2010 27.Dt VIRT 4 28.Os 29.Sh NAME 30.Nm virt 31.Nd rump virtual network interface 32.Sh SYNOPSIS 33.In rump/rump.h 34.Ft int 35.Fo rump_pub_virtif_create 36.Fa "int num" 37.Fc 38.Sh DESCRIPTION 39The 40.Nm 41interface acts as a link between a rump virtual kernel and a host 42.Xr tap 4 43interface. 44Interface number <n> always corresponds with the host tap interface tap<n>. 45All data sent by 46.Nm 47is written into 48.Pa /dev/tap<n> 49and all data read from 50.Pa /dev/tap<n> 51is passed as Ethernet input to the rump virtual kernel. 52.Pp 53A 54.Nm 55interface can be created in two ways: 56.Bl -bullet 57.It 58Programmatically by calling 59.Fn rump_pub_virtif_create . 60.It 61Dynamically at runtime with 62.Xr ifconfig 8 63or equivalent using the 64.Em create 65command. 66.El 67.Pp 68Destroying a 69.Nm 70interface is possible only through 71.Xr ifconfig 8 72.Em destroy . 73.Pp 74The host's 75.Xr tap 4 76interface can be further bridged with hardware interfaces to provide 77full Internet access to a rump kernel. 78.Sh SEE ALSO 79.Xr rump 3 , 80.Xr bridge 4 , 81.Xr tap 4 , 82.Xr brconfig 8 , 83.Xr ifconfig 8 84