d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Introduce a new toy interface, edsc(4). It's a discard interface

Browse Source 
imitating an Ethernet device, so vlan(4) and if_bridge(4) can be
attached to it for testing and benchmarking purposes.  Its source
can be an introduction to the anatomy of a network interface driver
due to its simplicity as well as to a bunch of comments in it.
This commit is contained in:
yar 2007-03-26 04:39:18 +00:00
parent ec89d3911e
commit cee18f9ca8
6 changed files with 125 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
share/man/man4/Makefile
View File

@ -67,6 +67,7 @@ MAN= aac.4 \
dpt.4 \
dummynet.4 \
ed.4 \
edsc.4 \
ef.4 \
ehci.4 \
em.4 \

111
share/man/man4/edsc.4 Normal file
View File

@ -0,0 +1,111 @@
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" From: @(#)lo.4 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd March 25, 2007
.Dt EDSC 4
.Os
.Sh NAME
.Nm edsc
.Nd Ethernet discard network interface
.Sh SYNOPSIS
.Cd "device edsc"
.Sh DESCRIPTION
The
.Nm
interface is a software discard mechanism which may be
used for performance analysis and software testing.
It imitates an Ethernet device, which
allows for its use in conjunction with such drivers as
.Xr if_bridge 4
and
.Xr vlan 4 .
.Pp
As with other network interfaces, an
.Nm
interface must have network addresses assigned for each address family
with which it is to be used.
These addresses may be set or changed with the
.Dv SIOCSIFADDR
.Xr ioctl 2
or
.Xr ifconfig 8
utility.
.Pp
Each
.Nm
interface is created at runtime using interface cloning.
This is most easily done with the
.Xr ifconfig 8
.Cm create
command or using the
.Va cloned_interfaces
variable in
.Xr rc.conf 5 .
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr arp 4 ,
.Xr if_bridge 4 ,
.Xr inet 4 ,
.Xr intro 4 ,
.Xr vlan 4 ,
.Xr rc.conf 5 ,
.Xr arp 8 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device was derived from the
.Xr disc 4
device and first appeared in
.Fx 7.0 .
This manpage was adapted from
.Xr disc 4 .
.Sh CAVEATS
Since outgoing packets are just discarded by
.Nm ,
ARP requests stay unreplied.
Consequently, an IP packet cannot be sent via
.Nm
until a static
.Xr arp 4
entry is created for its next hop using
.Xr arp 8 .
.Pp
Initially an
.Nm
interface has a zero link level address.
It can be changed with
.Xr ifconfig 8
.Cm lladdr
if needed.

3
sys/conf/NOTES
View File

@ -737,6 +737,8 @@ device mn # Munich32x/Falc54 Nx64kbit/sec cards.
# The `disc' device implements a minimal network interface,
# which throws away all packets sent and never receives any. It is
# included for testing purposes. This shows up as the `ds' interface.
# The `edsc' device implements a minimal Ethernet interface,
# which discards all packets sent and receives none.
# The `tap' device is a pty-like virtual Ethernet interface
# The `tun' device implements (user-)ppp and nos-tun
# The `gif' device implements IPv6 over IP4 tunneling,
@ -782,6 +784,7 @@ device sppp #Generic Synchronous PPP
device loop #Network loopback device
device bpf #Berkeley packet filter
device disc #Discard device (ds0, ds1, etc)
device edsc #Ethernet discard device
device tap #Virtual Ethernet driver
device tun #Tunnel driver (ppp(8), nos-tun(8))
device sl #Serial Line IP

1
sys/conf/files
View File

@ -1532,6 +1532,7 @@ net/if_atmsubr.c optional atm
net/if_bridge.c optional if_bridge
net/if_clone.c standard
net/if_disc.c optional disc
net/if_edsc.c optional edsc
net/if_ef.c optional ef
net/if_enc.c optional enc
net/if_ethersubr.c optional ether

1
sys/modules/Makefile
View File

@ -103,6 +103,7 @@ SUBDIR= ${_3dfx} \
${_ie} \
if_bridge \
if_disc \
if_edsc \
if_ef \
if_faith \
if_gif \

8
sys/modules/if_edsc/Makefile Normal file
View File

@ -0,0 +1,8 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../net
KMOD= if_edsc
SRCS= if_edsc.c
.include <bsd.kmod.mk>