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

       Solaris DDI specific (Solaris 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

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       net_protocol_lookup(9F), netinfo(9F), net_inject_t(9S)

SunOS 5.11							    1 May 2008							    net_inject(9F)