Tribblix: manual page: net

NET_INJECT(9F) Kernel Functions for Drivers NET_INJECT(9F)

NAME

net_inject - determine if a network interface name exists for a
network protocol

SYNOPSIS

#include <sys/neti.h>

int net_inject(const net_data_t net, inject_t style,
net_inject_t *packet);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

net
value returned from a successful call to
net_protocol_lookup(9F).

style
method that determines how this packet is to be injected
into the network or kernel.

packet
details about the packet to be injected.

DESCRIPTION

The net_inject() 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.

If NI_QUEUE_IN is specified, the packet is scheduled for delivery up
into the kernel, imitating its reception by a network interface. In
this mode, packet->ni_addr is ignored and packet->ni_physical
specifies the interface for which the packet is made to appear as if
it arrived on.

If NI_QUEUE_OUT 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, packet->ni_addr and packet->ni_physical are both ignored.

Neither NI_QUEUE_IN or NI_QUEUE_OUT 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 net_inject() 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 net_inject() for either NI_QUEUE_IN or
NI_QUEUE_OUT is presented to the packet event again. A packet
received by a hook from NH_PHYSICAL_IN and then queued up with
NI_QUEUE_IN is seen by the hook as another NH_PHYSICAL_IN packet.
This also applies to both NH_PHYSICAL_OUT and NI_QUEUE_OUT packets.

If NI_DIRECT_OUT 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, packet->ni_addr may be used to specify the next hop
(for the purpose of link layer address resolution) and
packet->ni_physical determines which interface the packet should be
sent out.

For all three packets, packet->ni_packet must point to an mblk
structure with the packet to be delivered.

See net_inject_t(9S) for more details on the structure net_inject_t.

RETURN VALUES

The net_inject() function returns:

-1
The network protocol does not support this function.

0
The packet is successfully queued or sent.

1
The packet could not be queued up or sent out immediately.

CONTEXT

The net_inject() function may be called from user, kernel, or
interrupt context.

ATTRIBUTES