illumos: manual page: ipnet.4d

IPNET(4D) Devices IPNET(4D)

NAME

ipnet, lo0 - ipnet device driver

SYNOPSIS

/dev/ipnet/*, /dev/lo0

DESCRIPTION

The ipnet device driver creates, removes and manages nodes in the
/dev/ipnet/ namespace.

A node is created in /dev/ipnet for every IP interface on the system,
including interfaces that exist only in software and for which there is
no hardware device. The ipnet 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 ipnet driver creates a /dev/lo0 DLPI
device.

APPLICATION PROGRAMMING INTERFACE

ipnet and DLPI
Device nodes created in /dev/ipnet are DLPI style-1 devices. All M_PROTO
and M_PCPROTO-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:

DL_INFO_REQ
DL_BIND_REQ
DL_UNBIND_REQ
DL_PROMISCON_REQ
DL_PROMISCOFF_REQ
DLIOCRAW

The values returned by the driver in the DL_INFO_ACK primitive in
response to the DL_INFO_REQ are:

o Maximum SDU is INT_MAX

o Minimum SDU is 0.

o DLSAP address length is 2.

o MAC type is DL_IPNET.

o SAP length value is 2.

o Service mode is DL_CLDLS.

o No optional quality of service (QOS) support is provided.
Accordingly, the QOS fields are 0.

o Provider style is DL_STYLE1.

o Version is DL_VERSION_2.

The /dev/ipnet/* and /dev/lo0 devices only accept DL_BIND_REQ requests
for SAPs 4 (IPv4 packets), 6 (IPv6 packets), or 0 (all IP packets).
DL_BIND_REQ requests for other SAP values result in a DL_ERROR_ACK of
DL_BADSAP.

ipnet primitives
For /dev/ipnet/* devices, the DL_PROMISCON_REQ and DL_PROMISCOFF_REQ
primitives with the DL_PROMISC_PHYS flag set in the dl_level 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 DL_PROMISC_MULTI flag set,
reception of all multicast group addresses can be enabled/disabled.
DL_PROMISC_PHYS and DL_PROMISC_MULTI have no effect for /dev/lo0. When
the DL_PROMISC_SAP flag is set, reception of all IPv4/IPv6 can be
enabled/disabled.

The DLIOCRAW ioctl is supported but has no effect on the data returned
from the device.

The DL_IOC_IPNET_INFO ioctl enables/disables the inclusion of a
dl_ipnetinfo_t structure that is prepended to the IP header when
receiving packet data. When enabled, a non-zero integer is returned
reflecting the current DL_IOC_IPNET_INFO version. The dl_ipnetinfo_t data
structure is defined in <sys/dlpi.h> and includes the following fields:

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) */

The current dli_version is 1. To robustly support future dl_ipnetinfo_t
versions, consumers should check that dli_version is a value they
recognize, and must use the dli_len field to advance past the
dl_ipnetinfo_t header.

FILES

/dev/ipnet/*, /dev/lo0
Special character devices.

/kernel/drv/ipnet.conf
Configuration file.

ATTRIBUTES