strcf(4tcp)

strcf -- configuration file for STREAMS TCP/IP

Description

The /etc/inet/strcf file contains the configuration that slink(1Mtcp) interprets to define the STREAMS TCP/IP interface. (Note that networking interfaces are defined via the /etc/confnet.d/interface file.)

The strcf file contains several functions that perform various configuration operations, along with a sample boot function. Normally, no function should be modified to customize the configuration for a given installation. In some cases, however, it may be necessary to change existing functions or add new functions.

The tp and linkint functions perform basic linking operations. The add_interface, add_interface_SNAP, and add_loop functions configure different types of interfaces.

tp -- configure link to a transport provider

Function tp sets up the link between a transport provider, such as TCP, and IP.

   #
   # tp - configure transport provider (i.e. tcp, udp, icmp)
   # usage: tp devname
   #
   tp {
   	p = open $1
   	ip = open /dev/ip
   	plink p ip
   	close p
   }

linkint -- configure the link interface

Function linkint links the specified streams and does a sifname operation with the given name.

   #
   # linkint - link interface to ip or arp
   # usage: linkint top bottom ifname flags
   #
   linkint {
   	x = plink $1 $2
   	sifname $1 x $3 $4
   }

add_interface -- configure an Ethernet interface

Function add_interface is used to configure a cloning device driver that uses a different major number for each interface that uses Ethernet framing (see RFC 894).

   #
   # add_interface - configure ethernet-type interface for cloning driver with
   #	one major per interface. Arguments are already concatenated with
   #	the major device number (such as emd0). It is assumed that boot has
   #	already run. We open /dev/ip and link the device beneath it.
   #
   # usage: add_interface compat_ip_fd dev ifname
   #
   add_interface {
   	dev = open $2
   	addr = dlbind dev 0x800		# For Ethernet encoding
   	ip = open /dev/ip
   	linkint ip dev $3 0x4042
   	close ip
   	dev2 = open $2
   	addr = dlbind dev2 0x806	# For Ethernet encoding
   	arp = open /dev/arp
   	sifhrd	arp ether		# hardware interface is ethernet
   	linkint arp dev2 $3 0x4042
   	sifaddr arp $3 addr
   	close arp
   	close dev2
   }

add_interface_SNAP -- configure an IEEE 802.n interface

Function add_interface_SNAP is used to configure a cloning device driver that uses a different major number for each interface that uses IEEE 802.n framing.

   #
   # add_interface_SNAP - configure ethernet-type interface for cloning driver
   #	with one major per interface. This version sets up 802.n framing.
   #	Arguments are already concatenated with the major device number
   #	(such as emd0). It is assumed that boot has already run.
   #	We bind the device to the SNAP SAP for ip and link the device
   #	under ip. We also bind the device to the SNAP SAP for arp and link
   #	the device under arp.
   #
   # usage: add_interface_SNAP compat_ip_fd dev ifname
   #
   add_interface_SNAP {
   	dev = open $2
   	addr = dlbind dev 0xaa		# For IEEE 802 encoding
   	dlsubsbind dev 0x800
   	ip = open /dev/ip
   	linkint ip dev $3 0x4042
   	close ip
   	dev2 = open $2
   	addr = dlbind dev2 0xaa		# For IEEE 802 encoding
   	dlsubsbind dev2 0x806
   	arp = open /dev/arp
   	sifhrd	arp ieee		# hardware interface is ieee802 
   	linkint arp dev2 $3 0x4042
   	sifaddr arp $3 addr
   	close arp
   	close dev2
   }

add_loop -- configure a loopback interface

Function add_loop configures the loopback interface.

   #
   # add_loop - configure loopback device. It is assumed that
   #	boot has already run. We will open /dev/ip ourselves
   #	and link the device beneath it.
   #
   # usage: add_loop compat_ip_fd compat_dev ifname
   #
   #
   add_loop {
   	dev = open $2
   	addr = dlbind dev 0x800
   	ip = open /dev/ip
   	linkint ip dev $3 0x4048
   	close ip
   	close dev
   }

boot -- configure network interface at boot time

Function boot is interpreted by slink unless an alternative function is specified. Normally, only the interfaces section and possibly the queue params section will have to be customized for a given installation.

   #
   # boot - boot time configuration
   #
   boot {
   	#
   	# queue params
   	#
   	initqp /dev/udp rq 8192 49152
   	initqp /dev/ip muxrq 8192 49152 muxwq 8192 49152
   	initqp /dev/tcp muxrq 8192 49152 muxwq 8192 49152
   	#
   	# transport
   	#
   	tp /dev/tcp
   	tp /dev/udp
   	tp /dev/icmp
   	tp /dev/igmp
   	tp /dev/ipip
   	tp /dev/rip
   }

Files

/etc/confnet.d/interface: network interface definition file
/etc/inet/strcf: configuration file for STREAMS TCP/IP

References

intro(7tcp), slink(1Mtcp)