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#!/bin/rc
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# ipv6on [netdir ndbfile] - configure an interface for ipv6.
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#	use ipv6 address from ndb if present,
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#	else do stateless address autoconfiguration (SLAAC).
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if (! ~ $#* 0 2 3) {
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	echo usage: $0 '[netdir ndbfile [obs-gw-v4-name]]' >[1=2]
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	exit usage
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}
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rfork e
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fn ipq {			# attr val rattr
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	ndb/ipquery $* | sed 's/^[a-z0-9]+=//'
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}
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if (~ $#* 0) {
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	netdir=/net
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	ndbf=/lib/ndb/local
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}
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if not {
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	netdir=$1
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	ndbf=$2
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}
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if (~ $netdir /net) {
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	xsfx=()
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	xdir=()
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}
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if not {
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	xsfx=(-x `{echo $netdir | sed 's;^/net;;'})
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	xdir=(-x $netdir)
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}
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fn nonnil {		# variable
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	if (~ $#$1 0) {
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		echo ipv6on: no ip for $1 >[1=2]
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		exit no-ip
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	}
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	if (! ~ $#$1 1) {
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		echo ipv6on: multiple ips for $1 >[1=2]
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		exit multiple-ips
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	}
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}
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#
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# configure v6 for link-local addresses (fe80::) & multicast (ff02::).
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# accept router advertisements, which will contain a default route.
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#
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if (! ip/ipconfig -6 $xdir ether $netdir/ether?)
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	exit 'ipconfig -6 failed'
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ip/ipconfig $xdir ether $netdir/ether? ra6 recvra 1
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# lookup any v6 address for me in ndb, else use slaac
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myeth=`{cat $netdir/ether?/addr}
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mev6=`{ndb/query -f $ndbf ether $myeth ipv6}
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if (~ $#mev6 0 || ~ $mev6 '')
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	mev6=`{ndb/query -f $ndbf sys $sysname ipv6}
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if (~ $#mev6 0 || ~ $mev6 '') {
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	# slaac: could perhaps get prefix from above RA
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	ipnet=`{ipq ether $myeth ipnet}
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	if (~ $#ipnet 0 || ~ $ipnet '')
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		ipnet=`{ipq sys $sysname ipnet}
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	nonnil ipnet
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	v6pfx=`{ipq ipnet $ipnet ipv6pfx}
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	nonnil v6pfx
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	mev6=`{ip/linklocal $myeth | sed 's/^fe80:/'$v6pfx'/'}
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}
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nonnil mev6
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#
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# configure my global v6 addresses
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#
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v6mask=`{ipq ip $mev6 ipmask}
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ip/ipconfig $xdir ether $netdir/ether?	add $mev6 $v6mask
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ip/ipconfig $xdir loopback /dev/null	add $mev6 /128