'\" te
.\" Copyright (c) 2009, Sun Microsystems, Inc. All Rights Reserved
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
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.TH IPNET 4D "Apr 8, 2009"
.SH NAME
ipnet, lo0 \- ipnet device driver
.SH SYNOPSIS
.LP
.nf
\fB/dev/ipnet/*, /dev/lo0\fR
.fi

.SH DESCRIPTION
.sp
.LP
The \fBipnet\fR device driver creates, removes and manages nodes in the
\fB/dev/ipnet/\fR namespace.
.sp
.LP
A node is created in \fB/dev/ipnet\fR for every IP interface on the system,
including interfaces that exist only in software and for which there is no
hardware device. The \fBipnet\fR device also provides access to all IP traffic
to and from the system. To provide access to packets that are internally
looped-back in IP, the \fBipnet\fR driver creates a \fB/dev/lo0\fR DLPI device.
.SH APPLICATION PROGRAMMING INTERFACE
.SS "ipnet and DLPI"
.sp
.LP
Device nodes created in \fB/dev/ipnet\fR are DLPI style-1 devices. All
\fBM_PROTO\fR and \fBM_PCPROTO\fR-type messages are interpreted as DLPI
primitives. Because the device is read-only and packets can only be observed by
opening them, the following subset of DLPI primitives is supported:
.sp
.in +2
.nf
DL_INFO_REQ
DL_BIND_REQ
DL_UNBIND_REQ
DL_PROMISCON_REQ
DL_PROMISCOFF_REQ
DLIOCRAW
.fi
.in -2

.sp
.LP
The values returned by the driver in the \fBDL_INFO_ACK\fR primitive in
response to the \fBDL_INFO_REQ\fR are:
.RS +4
.TP
.ie t \(bu
.el o
Maximum \fBSDU\fR is \fBINT_MAX\fR
.RE
.RS +4
.TP
.ie t \(bu
.el o
Minimum \fBSDU\fR is \fB0\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fBDLSAP\fR address length is \fB2.\fR
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fBMAC\fR type is \fBDL_IPNET\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fBSAP\fR length value is \fB2\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Service mode is \fBDL_CLDLS\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
No optional quality of service (QOS) support is provided. Accordingly, the QOS
fields are 0.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Provider style is \fBDL_STYLE1\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Version is \fBDL_VERSION_2\fR.
.RE
.sp
.LP
The \fB/dev/ipnet/*\fR and \fB/dev/lo0\fR devices only accept \fBDL_BIND_REQ\fR
requests for SAPs 4 (IPv4 packets), 6 (IPv6 packets), or 0 (all IP packets).
\fBDL_BIND_REQ\fR requests for other SAP values result in a \fBDL_ERROR_ACK\fR
of \fBDL_BADSAP\fR.
.SS "ipnet primitives"
.sp
.LP
For \fB/dev/ipnet/*\fR devices, the \fBDL_PROMISCON_REQ\fR and
\fBDL_PROMISCOFF_REQ\fR primitives with the \fBDL_PROMISC_PHYS\fR flag set in
the \fBdl_level\fR field enables/disables the reception of all packets. When
disabled, only packets with addresses matching any of the configured addresses
on the IP interface are received. When used with the \fBDL_PROMISC_MULTI\fR
flag set, reception of all multicast group addresses can be enabled/disabled.
\fBDL_PROMISC_PHYS\fR and \fBDL_PROMISC_MULTI\fR have no effect for
\fB/dev/lo0\fR. When the \fBDL_PROMISC_SAP\fR flag is set, reception of all
IPv4/IPv6 can be enabled/disabled.
.sp
.LP
The \fBDLIOCRAW\fR ioctl is supported but has no effect on the data returned
from the device.
.sp
.LP
The \fBDL_IOC_IPNET_INFO\fR ioctl enables/disables the inclusion of a
\fBdl_ipnetinfo_t\fR structure that is prepended to the IP header when
receiving packet data. When enabled, a non-zero integer is returned reflecting
the current \fBDL_IOC_IPNET_INFO\fR version. The \fBdl_ipnetinfo_t\fR data
structure is defined in \fB<sys/dlpi.h>\fR and includes the following fields:
.sp
.in +2
.nf
uint8_t  dli_version;  /* DL_IPNETINFO_* version */
uint8_t  dli_ipver;    /* packet IP header version */
uint16_t dli_len;      /* length of dl_ipnetinfo_t */
uint64_t dli_srczone;  /* packet source zone ID (if any) */
uint64_t dli_dstzone;  /* packet dest zone ID (if any) */
.fi
.in -2

.sp
.LP
The current \fBdli_version\fR is 1. To robustly support future
\fBdl_ipnetinfo_t\fR versions, consumers should check that \fBdli_version\fR is
a value they recognize, and must use the \fBdli_len\fR field to advance past
the \fBdl_ipnetinfo_t\fR header.
.SH FILES
.sp
.ne 2
.na
\fB\fB/dev/ipnet/*, /dev/lo0\fR\fR
.ad
.RS 26n
Special character devices.
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/ipnet.conf\fR\fR
.ad
.RS 26n
Configuration file.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
l l
l l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	SPARC, x86
Interface Stability	Committed
.TE

.SH SEE ALSO
.sp
.LP
.BR dlpi (4P),
.BR attributes (7)