idn - inter-domain network device driver
The idn driver is a multi-thread, loadable, clonable,
STREAMS-based pseudo driver that supports the connectionless
Data Link Provider Interface dlpi(7P) over the Sun Enter-
prise 10000 Gigplane-XB Interconnect. This connection is
permitted only between domains within the same Sun Enter-
prise 10000 server.
The idn driver supports 1 to 32 logical network interfaces
that can be connected to domains linked to the local domain
through the domain_link(1M) command. (See domain_link(1M) in
the Sun Enterprise 10000 SSP 3.2 Reference Manual for more
information.) The idn driver works in conjunction with the
System Service Processor (SSP) to perform domain
linking/unlinking and automated linking upon host bootup.
The /dev/idn device is used to access all IDN services pro-
vided by the system.
IDN and DLPI
The idn driver is a style-2 Data Link Service provider. All
M_PROTO and M_PCPROTO-type messages are interpreted as DLPI
primitives. For the idn driver to associate the opened
stream with a particular device (ppa), you must send an
explicit DL_ATTACH_REQ message. The ppa ID is interpreted
as an unsigned long and indicates the corresponding device
instance (unit) number. The DL_ERROR_ACK error is returned
by the driver if the ppa field value does not correspond to
a valid device-instance number for the system. The device is
initialized on first attach and de-initialized (stopped) on
the last detach.
o The maximum SDU is configurable by using the idn.conf
file and has a range of 512 bytes to 512 Kbytes. The
default value is 16384 bytes.
o The minimum SDU is 0.
o The Service Access Pointer (SAP) address length is 8.
o The MAC type is DL_ETHER.
o The SAP length value is -2, meaning the physical
address component is followed immediately by a 2-byte
SAP component within the DLSAP address.
o The service mode is DL_CLDLS.
o Optional quality of service (QOS) is not presently
supported; accordingly, the QOS fields are 0.
o The provider style is DL_STYLE2.
o The version is DL_VERSION_2.
o The broadcast address value is Ethernet/IEEE broadcast
address (0xFFFFFF). The idn driver supports broadcast
by issuing messages to each target individually. The
idn driver is inherently a point-to-point network
between domains. When the idn driver is in the
DL_ATTACHED state, the user must send a DL_BIND_REQ
request to associate a particular SAP with the stream.
The idn driver interprets the SAP field within the
DL_BIND_REQ message as an Ethernet type and valid
values for the SAP field are in the range of 0 to
0xFFFF. Only one Ethernet type can be bound to the
stream at any time.
If a SAP with a value of 0 is selected, the receiver will be
in 802.3 mode. All frames received from the media having a
type field in the range of 0 to 1500 are assumed to be 802.3
frames and are routed up all open streams which are bound to
SAP value 0. If more than one stream is in 802.3 mode,
then the frame will be duplicated and routed up as multiple
stream DL_UNITDATA_IND messages.
In transmission, the driver checks the SAP field of the
DL_BIND_REQ to determine if the SAP value is 0, and if the
destination type field is in the range of 0 to 1500. If
either is true, the driver computes the length of the mes-
sage, (excluding the initial message block M_PROTO mblk) of
all subsequent DL_UNITDATA_REQ messages and transmits 802.3
frames that have this value in the MAC frame header length
The driver also supports raw M_DATA mode. When the user
sends a DLIOCRAW ioctl, the particular stream is put in raw
mode. A complete frame and a proper ether header is expected
as part of the data.
The DLSAP address format consists of the 6-byte, physical
address component (Ethernet) followed immediately by the 2-
byte SAP component (type), producing an 8-byte DLSAP
address. Applications should not hardcode to this particular
implementation-specific DLSAP address format, but instead
should use information returned in the DL_INFO_ACK primitive
to compose and decompose DLSAP addresses. The SAP length,
full DLSAP length, and SAP physical ordering are included
within the DL_INFO_ACK primitive. The physical address
length can be computed by subtracting the SAP length from
the full DLSAP address length or by issuing the
DL_PHYS_ADDR_REQ message to obtain the current physical
address associated with the stream.
When the idn driver is in the DL_BOUND state, you can
transmit frames on the IDN by sending DL_UNITDATA_REQ mes-
sages to the driver. The driver then routes received IDN
frames up the open and bound streams having a SAP which
matches the Ethernet type as DL_UNITDATA_IND messages. If
necessary, received IDN frames are duplicated and routed up
multiple open streams. The DLSAP address contained within
the DL_UNITDATA_REQ and DL_UNITDATA_IND messages consists of
both the SAP (type) and physical (Ethernet) components.
In addition to the mandatory connectionless DLPI message
set, the idn driver supports the following primitives:
The DL_ENABMULTI_REQ and DL_DISABMULTI_REQ primitives which
enable or disable, respectively, the reception of individual
multicast group addresses. A set of multicast addresses may
be iteratively created and modified on a per-stream basis
using these primitives. These primitives are accepted by
the driver in any state following the DL_ATTACHED state.
The DL_PROMISCON_REQ and DL_PROMISCOFF_REQ primitives, which
with the DL_PROMISC_PHYS flag set in the dl_level field,
enable or disable, respectively, the reception of all prom-
iscuous frames on the media, including frames generated by
the local domain. When used with the DL_PROMISC_SAP flag set
in the dl_level field, these primitives enable or disable,
respectively, the reception of all SAP (Ethernet type)
values. When used with the DL_PROMISC_MULTI flag set in the
dl_level field, these primitives enable or disable, respec-
tively, the reception of all multicast group addresses. The
effect of each is always on a per-stream basis and indepen-
dent of the other SAP and physical level configurations on
this stream or other streams.
The DL_PHYS_ADDR_REQ primitive which returns the 6-octet,
Ethernet address associated with (or attached to) the stream
in the DL_PHYS_ADDR_ACK primitive. This primitive is valid
only in states following a successful DL_ATTACH_REQ request.
Because the driver maintains domain address information in
the address to direct packets to the correct destination,
the DL_SET_PHYS_ADDR_REQ primitive is not allowed.
The following files are supported:
IDN special character device
System-wide and per-interface default device driver
netstat(1M), ndd(1M), dlpi(7P)
domain_link(1M) in the Sun Enterprise 10000 SSP 3.2 Refer-
Sun Enterprise 10000 InterDomain Networks User Guide
The idn driver supports a set of properties that can be set
by using the driver.conf file for the IDN. See the Sun
Enterprise 10000 InterDomain Networks User Guide for more
information about the properties in the driver.conf(4),
(idn.conf, for IDNs).
Man(1) output converted with