'\" te
.\" Copyright (C) 2008, 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.  See the License for the specific language governing permissions and limitations under the License.
.\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.TH NET_INJECT 9F "May 1, 2008"
.SH NAME
net_inject \- determine if a network interface name exists for a network
protocol
.SH SYNOPSIS
.nf
#include <sys/neti.h>

\fBint\fR \fBnet_inject\fR(\fBconst\fR \fBnet_data_t\fR \fInet\fR, \fBinject_t\fR \fIstyle\fR,
      \fBnet_inject_t\fR *\fIpacket\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH PARAMETERS
.ne 2
.na
\fB\fInet\fR\fR
.ad
.RS 10n
value returned from a successful call to \fBnet_protocol_lookup\fR(9F).
.RE

.sp
.ne 2
.na
\fB\fIstyle\fR\fR
.ad
.RS 10n
method that determines how this packet is to be injected into the network or
kernel.
.RE

.sp
.ne 2
.na
\fB\fIpacket\fR\fR
.ad
.RS 10n
details about the packet to be injected.
.RE

.SH DESCRIPTION
The \fBnet_inject()\fR function provides an interface to allow delivery of
network layer (layer 3) packets either into the kernel or onto the network. The
method of delivery is determined by style.
.sp
.LP
If \fBNI_QUEUE_IN\fR is specified, the packet is scheduled for delivery up into
the kernel, imitating its reception by a network interface. In this mode,
\fBpacket->ni_addr\fR is ignored and \fB packet->ni_physical\fR  specifies the
interface for which the packet is made to appear as if it arrived on.
.sp
.LP
If \fBNI_QUEUE_OUT\fR is specified, the packet is scheduled for delivery out of
the kernel, as if it were being sent by a raw socket. In this mode,
\fBpacket->ni_addr\fR and \fBpacket->ni_physical\fR are both ignored.
.sp
.LP
Neither \fBNI_QUEUE_IN\fR or \fBNI_QUEUE_OUT\fR cause the packet to be
immediately processed by the kernel. Instead, the packet is added to a list and
a timeout is scheduled (if there are none already pending) to deliver the
packet. The  call to \fBnet_inject()\fR returns once the setup has been
completed, and not after the packet has been processed. The packet processing
is completed on a different thread and in a different context to that of the
original packet. Thus, a packet queued up using \fBnet_inject()\fR for either
\fBNI_QUEUE_IN\fR or \fBNI_QUEUE_OUT\fR is presented to the packet event again.
A packet received by a hook from \fBNH_PHYSICAL_IN\fR and then queued up with
\fBNI_QUEUE_IN\fR is seen by the hook as another \fBNH_PHYSICAL_IN\fR packet.
This also applies to both \fBNH_PHYSICAL_OUT\fR and \fBNI_QUEUE_OUT\fR packets.
.sp
.LP
If \fBNI_DIRECT_OUT\fR is specified, an attempt is made to send the packet out
to a network interface immediately. No processing on the packet, aside from
prepending any required layer 2 information, is made. In this instance,
\fBpacket->ni_addr\fR may be used to specify the next hop (for the purpose of
link layer address resolution) and \fBpacket->ni_physical\fR determines which
interface the packet should be sent out.
.sp
.LP
For all three packets, \fBpacket->ni_packet\fR must point to an \fBmblk\fR
structure with the packet to be delivered.
.sp
.LP
See \fBnet_inject_t\fR(9S) for more details on the structure
\fBnet_inject_t\fR.
.SH RETURN VALUES
The \fBnet_inject()\fR function returns:
.sp
.ne 2
.na
\fB-1\fR
.ad
.RS 6n
The network protocol does not support this function.
.RE

.sp
.ne 2
.na
\fB0\fR
.ad
.RS 6n
The packet is successfully queued or sent.
.RE

.sp
.ne 2
.na
\fB1\fR
.ad
.RS 6n
The packet could not be queued up or sent out immediately.
.RE

.SH CONTEXT
The \fBnet_inject()\fR function may be called from user,  kernel, or interrupt
context.
.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
.TE

.SH SEE ALSO
.BR net_protocol_lookup (9F),
.BR netinfo (9F),
.BR net_inject_t (9S)