Update jail startup script for multi-IPv4/v6/no-IP jails.

Note: this is only really necessary because of the ifconfig
      logic to add/remove the jail IPs upon start/stop.
      Consensus among simon and I is that the logic should
      really be factored out from the startup script and put
      into a proper management solution.

- We now support starting of no-IP jails.
- Remove the global jail_<jname>_netmask option as it is only
  helpful to set netmasks/prefixes for the right address
  family and per address.
- Implement jail_<jname>_ip options to support both
  address familes with regard to ifconfig logic.
- Implement _multi<n> support suffix to the jail_<jname>_ip
  option to configure additional addresses to avoid overlong,
  unreadbale jail_<jname>_ip lines with lots of addresses.

Submitted by:	initial work from Ruben van Staveren
Discussed on:	freebsd-jail in Nov 2008.
Reviewed by:	simon, ru (partial, older version)
MFC after:	1 week

1 files changed, 7 insertions, 5 deletions

diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf
index 99cf2d2..40c35df 100644
--- a/etc/defaults/rc.conf
+++ b/etc/defaults/rc.conf
@@ -617,14 +617,16 @@ jail_sysvipc_allow="NO"	# Allow SystemV IPC use from within a jail
 # each jail, specified in jail_list, with the following variables.
 # NOTES:
 # - replace 'example' with the jail's name.
-# - except rootdir, hostname and ip, all of the following variables may be made
-#   global jail variables if you don't specify a jail name (ie. jail_interface).
+# - except rootdir, hostname, ip and the _multi<n> addresses,
+#   all of the following variables may be made global jail variables
+#   if you don't specify a jail name (ie. jail_interface, jail_devfs_ruleset).
 #
 #jail_example_rootdir="/usr/jail/default"	# Jail's root directory
 #jail_example_hostname="default.domain.com"	# Jail's hostname
-#jail_example_ip="192.0.2.10"			# Jail's IP number
-#jail_example_interface=""			# Interface to create the IP alias on
-#jail_example_fib="0"				# routing table for setfib(1) 
+#jail_example_interface=""			# Jail's interface variable to create IP aliases on
+#jail_example_fib="0"				# Routing table for setfib(1) 
+#jail_example_ip="192.0.2.10,2001:db8::17"	# Jail's primary IPv4 and IPv6 address
+#jail_example_ip_multi0="2001:db8::10"		#  and another IPv6 address
 #jail_example_exec_start="/bin/sh /etc/rc"		# command to execute in jail for starting
 #jail_example_exec_afterstart0="/bin/sh command"	# command to execute after the one for 
 							# starting the jail. More than one can be