Author: dteske
Date: Sun Feb 7 16:41:54 2016
New Revision: 295373
URL: https://svnweb.freebsd.org/changeset/base/295373
Log:
Add two scripts for vnet jails
One for if_bridge(4) back-end, another for ng_bridge(4) back-end
Sponsored by: FIS Global, Inc.
Added:
head/share/examples/jails/jib (contents, props changed)
head/share/examples/jails/jng (contents, props changed)
Added: head/share/examples/jails/jib
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/examples/jails/jib Sun Feb 7 16:41:54 2016
(r295373)
@@ -0,0 +1,367 @@
+#!/bin/sh
+#-
+# Copyright (c) 2016 Devin Teske
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+############################################################ IDENT(1)
+#
+# $Title: if_bridge(4) management script for vnet jails $
+#
+############################################################ INFORMATION
+#
+# Use this tool with jail.conf(5) (or rc.conf(5) ``legacy'' configuration) to
+# manage `vnet' interfaces. In jail.conf(5) format:
+#
+# ### BEGIN EXCERPT ###
+#
+# xxx {
+# host.hostname = "xxx.yyy";
+# path = "/vm/xxx";
+#
+# #
+# # NB: Below 2-lines required
+# # NB: The number of eNb_xxx interfaces should match the number of
+# # arguments given to `jib addm xxx' in exec.prestart value.
+# #
+# vnet;
+# vnet.interface = "e0b_xxx e1b_xxx ...";
+#
+# exec.clean;
+# exec.system_user = "root";
+# exec.jail_user = "root";
+#
+# #
+# # NB: Below 2-lines required
+# # NB: The number of arguments after `jib addm xxx' should match
+# # the number of eNb_xxx arguments in vnet.interface value.
+# #
+# exec.prestart += "jib addm xxx em0 em1 ...";
+# exec.poststop += "jib destroy xxx";
+#
+# # Standard recipe
+# exec.start += "/bin/sh /etc/rc";
+# exec.stop = "/bin/sh /etc/rc.shutdown";
+# exec.consolelog = "/var/log/jail_xxx_console.log";
+# mount.devfs;
+#
+# # Optional (default off)
+# #allow.mount;
+# #allow.set_hostname = 1;
+# #allow.sysvipc = 1;
+# #devfs_ruleset = "11"; # rule to unhide bpf for DHCP
+# }
+#
+# ### END EXCERPT ###
+#
+# In rc.conf(5) ``legacy'' format (used when /etc/jail.conf does not exist):
+#
+# ### BEGIN EXCERPT ###
+#
+# jail_enable="YES"
+# jail_list="xxx"
+#
+# #
+# # Global presets for all jails
+# #
+# jail_devfs_enable="YES" # mount devfs
+#
+# #
+# # Global options (default off)
+# #
+# #jail_mount_enable="YES" # mount /etc/fstab.{name}
+# #jail_set_hostname_allow="YES" # Allow hostname to change
+# #jail_sysvipc_allow="YES" # Allow SysV Interprocess Comm.
+#
+# # xxx
+# jail_xxx_hostname="xxx.shxd.cx" # hostname
+# jail_xxx_rootdir="/vm/xxx" # root directory
+# jail_xxx_vnet_interfaces="e0b_xxx e1bxxx ..." # vnet interface(s)
+# jail_xxx_exec_prestart0="jib addm xxx em0 em1 ..." # bridge interface(s)
+# jail_xxx_exec_poststop0="jib destroy xxx" # destroy interface(s)
+# #jail_xxx_mount_enable="YES" # mount /etc/fstab.xxx
+# #jail_xxx_devfs_ruleset="11" # rule to unhide bpf for DHCP
+#
+# ### END EXCERPT ###
+#
+# Note that the legacy rc.conf(5) format is converted to
+# /var/run/jail.{name}.conf by /etc/rc.d/jail if jail.conf(5) is missing.
+#
+# ASIDE: dhclient(8) inside a vnet jail...
+#
+# To allow dhclient(8) to work inside a vnet jail, make sure the following
+# appears in /etc/devfs.rules (which should be created if it doesn't exist):
+#
+# [devfsrules_jail=11]
+# add include $devfsrules_hide_all
+# add include $devfsrules_unhide_basic
+# add include $devfsrules_unhide_login
+# add include $devfsrules_unhide_bpf
+#
+# And set ether devfs.ruleset="11" (jail.conf(5)) or
+# jail_{name}_devfs_ruleset="11" (rc.conf(5)).
+#
+# NB: While this tool can't create every type of desirable topology, it should
+# handle most setups, minus some which considered exotic or purpose-built.
+#
+############################################################ GLOBALS
+
+pgm="${0##*/}" # Program basename
+
+#
+# Global exit status
+#
+SUCCESS=0
+FAILURE=1
+
+############################################################ FUNCTIONS
+
+usage()
+{
+ local action usage descr
+ exec >&2
+ echo "Usage: $pgm action [arguments]"
+ echo "Actions:"
+ for action in \
+ addm \
+ show \
+ show1 \
+ destroy \
+ ; do
+ eval usage=\"\$jib_${action}_usage\"
+ [ "$usage" ] || continue
+ eval descr=\"\$jib_${action}_descr\"
+ printf "\t%s\n\t\t%s\n" "$usage" "$descr"
+ done
+ exit $FAILURE
+}
+
+action_usage()
+{
+ local usage action="$1"
+ eval usage=\"\$jib_${action}_usage\"
+ echo "Usage: $pgm $usage" >&2
+ exit $FAILURE
+}
+
+mustberoot_to_continue()
+{
+ if [ "$( id -u )" -ne 0 ]; then
+ echo "Must run as root!" >&2
+ exit $FAILURE
+ fi
+}
+
+jib_addm_usage="addm [-b BRIDGE_NAME] NAME interface0 [interface1 ...]"
+jib_addm_descr="Creates e0b_NAME [e1b_NAME ...]"
+jib_addm()
+{
+ local OPTIND=1 OPTARG flag bridge=bridge
+ while getopts b: flag; do
+ case "$flag" in
+ b) bridge="${OPTARG:-bridge}" ;;
+ *) action_usage addm # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND - 1 ))
+
+ local name="$1"
+ [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -gt 1 ] ||
+ action_usage addm # NOTREACHED
+ shift 1 # name
+
+ mustberoot_to_continue
+
+ local iface iface_devid eiface_devid_a eiface_devid_b
+ local new num quad i=0
+ for iface in $*; do
+
+ # 1. Make sure the interface doesn't exist already
+ ifconfig "e${i}a_$name" > /dev/null 2>&1 && continue
+
+ # 2. Bring the interface up
+ ifconfig $iface up || return
+
+ # 3. Make sure the interface has been bridged
+ if ! ifconfig "$iface$bridge" > /dev/null 2>&1; then
+ new=$( ifconfig bridge create ) || return
+ ifconfig $new addm $iface || return
+ ifconfig $new name "$iface$bridge" || return
+ fi
+
+ # 4. Create a new interface to the bridge
+ new=$( ifconfig epair create ) || return
+ ifconfig "$iface$bridge" addm $new || return
+
+ # 5. Rename the new interface
+ ifconfig $new name "e${i}a_$name" || return
+ ifconfig ${new%a}b name "e${i}b_$name" || return
+
+ #
+ # 6. Set the MAC address of the new interface using a sensible
+ # algorithm to prevent conflicts on the network.
+ #
+ # The formula I'm using is ``SP:SS:SI:II:II:II'' where:
+ # + S denotes 16 bits of sum(1) data, split because P (below).
+ # + P denotes the special nibble whose value, if one of
+ # 2, 6, A, or E (but usually 2) denotes a privately
+ # administered MAC address (while remaining routable).
+ # + I denotes bits that are inherited from parent interface.
+ #
+ # The S bits are a CRC-16 checksum of NAME, allowing the jail
+ # to change the epair(4) generation order without affecting the
+ # MAC address. Meanwhile, if the jail NAME changes (e.g., it
+ # was duplicated and given a new name with no other changes),
+ # the underlying network interface changes, or the jail is
+ # moved to another host, the MAC address will be recalculated
+ # to a new, similarly unique value preventing conflict.
+ #
+ iface_devid=$( ifconfig $iface ether | awk '/ether/,$0=$2' )
+ eiface_devid_a=${iface_devid#??:??:?}
+ eiface_devid_b=${iface_devid#??:??:?}
+ num=$( set -- `echo -n $name | sum` && echo $1 )
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid_a=:$quad$eiface_devid_a
+ eiface_devid_b=:$quad$eiface_devid_b
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid_a=$quad$eiface_devid_a
+ eiface_devid_b=$quad$eiface_devid_b
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid_a=2:$quad$eiface_devid_a
+ eiface_devid_b=6:$quad$eiface_devid_b
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid_a=$quad$eiface_devid_a
+ eiface_devid_b=$quad$eiface_devid_b
+ ifconfig "e${i}a_$name" ether $eiface_devid_a > /dev/null 2>&1
+ ifconfig "e${i}b_$name" ether $eiface_devid_b > /dev/null 2>&1
+
+ i=$(( $i + 1 )) # on to next ng{i}_name
+ done # for iface
+}
+
+jib_show_usage="show"
+jib_show_descr="List possible NAME values for \`show NAME'"
+jib_show1_usage="show NAME"
+jib_show1_descr="Lists ng0_NAME [ng1_NAME ...]"
+jib_show2_usage="show [NAME]"
+jib_show()
+{
+ local OPTIND=1 OPTARG flag
+ while getopts "" flag; do
+ case "$flag" in
+ *) action_usage show2 # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND - 1 ))
+ if [ $# -eq 0 ]; then
+ ifconfig | awk '
+ /^[^:[:space:]]+:/ {
+ iface = $1
+ sub(/:.*/, "", iface)
+ next
+ }
+ $1 == "groups:" {
+ for (n = split($0, group); n > 1; n--) {
+ if (group[n] != "bridge") continue
+ print iface
+ next
+ }
+ }' |
+ xargs -rn1 ifconfig |
+ awk '$1 == "member:" &&
+ sub(/^e[[:digit:]]+a_/, "", $2), $0 = $2' |
+ sort -u
+ return
+ fi
+ ifconfig | awk -v name="$1" '
+ match($0, /^e[[:digit:]]+a_/) && sub(/:.*/, "") &&
+ substr($1, RSTART + RLENGTH) == name
+ ' | sort
+}
+
+jib_destroy_usage="destroy NAME"
+jib_destroy_descr="Destroy e0b_NAME [e1b_NAME ...]"
+jib_destroy()
+{
+ local OPTIND=1 OPTARG flag
+ while getopts "" flag; do
+ case "$flag" in
+ *) action_usage destroy # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND -1 ))
+ local name="$1"
+ [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -eq 1 ] ||
+ action_usage destroy # NOTREACHED
+ mustberoot_to_continue
+ jib_show "$name" | xargs -rn1 -I eiface ifconfig eiface destroy
+}
+
+############################################################ MAIN
+
+#
+# Command-line arguments
+#
+action="$1"
+[ "$action" ] || usage # NOTREACHED
+
+#
+# Validate action argument
+#
+if [ "$BASH_VERSION" ]; then
+ type="$( type -t "jib_$action" )" || usage # NOTREACHED
+else
+ type="$( type "jib_$action" 2> /dev/null )" || usage # NOTREACHED
+fi
+case "$type" in
+*function)
+ shift 1 # action
+ eval "jib_$action" \"\$@\"
+ ;;
+*) usage # NOTREACHED
+esac
+
+################################################################################
+# END
+################################################################################
Added: head/share/examples/jails/jng
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/examples/jails/jng Sun Feb 7 16:41:54 2016
(r295373)
@@ -0,0 +1,416 @@
+#!/bin/sh
+#-
+# Copyright (c) 2016 Devin Teske
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+############################################################ IDENT(1)
+#
+# $Title: netgraph(4) management script for vnet jails $
+#
+############################################################ INFORMATION
+#
+# Use this tool with jail.conf(5) (or rc.conf(5) ``legacy'' configuration) to
+# manage `vnet' interfaces. In jail.conf(5) format:
+#
+# ### BEGIN EXCERPT ###
+#
+# xxx {
+# host.hostname = "xxx.yyy";
+# path = "/vm/xxx";
+#
+# #
+# # NB: Below 2-lines required
+# # NB: The number of ngN_xxx interfaces should match the number of
+# # arguments given to `jng bridge xxx' in exec.prestart value.
+# #
+# vnet;
+# vnet.interface = "ng0_xxx ng1_xxx ...";
+#
+# exec.clean;
+# exec.system_user = "root";
+# exec.jail_user = "root";
+#
+# #
+# # NB: Below 2-lines required
+# # NB: The number of arguments after `jng bridge xxx' should match
+# # the number of ngN_xxx arguments in vnet.interface value.
+# #
+# exec.prestart += "jng bridge xxx em0 em1 ...";
+# exec.poststop += "jng shutdown xxx";
+#
+# # Standard recipe
+# exec.start += "/bin/sh /etc/rc";
+# exec.stop = "/bin/sh /etc/rc.shutdown";
+# exec.consolelog = "/var/log/jail_xxx_console.log";
+# mount.devfs;
+#
+# # Optional (default off)
+# #allow.mount;
+# #allow.set_hostname = 1;
+# #allow.sysvipc = 1;
+# #devfs_ruleset = "11"; # rule to unhide bpf for DHCP
+# }
+#
+# ### END EXCERPT ###
+#
+# In rc.conf(5) ``legacy'' format (used when /etc/jail.conf does not exist):
+#
+# ### BEGIN EXCERPT ###
+#
+# jail_enable="YES"
+# jail_list="xxx"
+#
+# #
+# # Global presets for all jails
+# #
+# jail_devfs_enable="YES" # mount devfs
+#
+# #
+# # Global options (default off)
+# #
+# #jail_mount_enable="YES" # mount /etc/fstab.{name}
+# #jail_set_hostname_allow="YES" # Allow hostname to change
+# #jail_sysvipc_allow="YES" # Allow SysV Interprocess Comm.
+#
+# # xxx
+# jail_xxx_hostname="xxx.shxd.cx" # hostname
+# jail_xxx_rootdir="/vm/xxx" # root directory
+# jail_xxx_vnet_interfaces="ng0_xxx ng1xxx ..." # vnet interface(s)
+# jail_xxx_exec_prestart0="jng bridge xxx em0 em1 ..." # bridge interface(s)
+# jail_xxx_exec_poststop0="jng shutdown xxx" # destroy interface(s)
+# #jail_xxx_mount_enable="YES" # mount /etc/fstab.xxx
+# #jail_xxx_devfs_ruleset="11" # rule to unhide bpf for DHCP
+#
+# ### END EXCERPT ###
+#
+# Note that the legacy rc.conf(5) format is converted to
+# /var/run/jail.{name}.conf by /etc/rc.d/jail if jail.conf(5) is missing.
+#
+# ASIDE: dhclient(8) inside a vnet jail...
+#
+# To allow dhclient(8) to work inside a vnet jail, make sure the following
+# appears in /etc/devfs.rules (which should be created if it doesn't exist):
+#
+# [devfsrules_jail=11]
+# add include $devfsrules_hide_all
+# add include $devfsrules_unhide_basic
+# add include $devfsrules_unhide_login
+# add include $devfsrules_unhide_bpf
+#
+# And set ether devfs.ruleset="11" (jail.conf(5)) or
+# jail_{name}_devfs_ruleset="11" (rc.conf(5)).
+#
+# NB: While this tool can't create every type of desirable topology, it should
+# handle most setups, minus some which considered exotic or purpose-built.
+#
+############################################################ GLOBALS
+
+pgm="${0##*/}" # Program basename
+
+#
+# Global exit status
+#
+SUCCESS=0
+FAILURE=1
+
+############################################################ FUNCTIONS
+
+usage()
+{
+ local action usage descr
+ exec >&2
+ echo "Usage: $pgm action [arguments]"
+ echo "Actions:"
+ for action in \
+ bridge \
+ graph \
+ show \
+ show1 \
+ shutdown \
+ ; do
+ eval usage=\"\$jng_${action}_usage\"
+ [ "$usage" ] || continue
+ eval descr=\"\$jng_${action}_descr\"
+ printf "\t%s\n\t\t%s\n" "$usage" "$descr"
+ done
+ exit $FAILURE
+}
+
+action_usage()
+{
+ local usage action="$1"
+ eval usage=\"\$jng_${action}_usage\"
+ echo "Usage: $pgm $usage" >&2
+ exit $FAILURE
+}
+
+mustberoot_to_continue()
+{
+ if [ "$( id -u )" -ne 0 ]; then
+ echo "Must run as root!" >&2
+ exit $FAILURE
+ fi
+}
+
+jng_bridge_usage="bridge [-b BRIDGE_NAME] NAME interface0 [interface1 ...]"
+jng_bridge_descr="Create ng0_NAME [ng1_NAME ...]"
+jng_bridge()
+{
+ local OPTIND=1 OPTARG flag bridge=bridge
+ while getopts b: flag; do
+ case "$flag" in
+ b) bridge="$OPTARG"
+ [ "$bridge" ] || action_usage bridge ;; # NOTREACHED
+ *) action_usage bridge # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND - 1 ))
+
+ local name="$1"
+ [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -gt 1 ] ||
+ action_usage bridge # NOTREACHED
+ shift 1 # name
+
+ mustberoot_to_continue
+
+ local iface iface_devid eiface eiface_devid
+ local new num quad i=0
+ for iface in $*; do
+
+ # 0. Make sure the interface doesn't exist already
+ eiface=ng${i}_$name
+ ngctl msg "$eiface:" getifname > /dev/null 2>&1 && continue
+
+ # 1. Bring the interface up
+ ifconfig $iface up || return
+
+ # 2. Set promiscuous mode and don't overwrite src addr
+ ngctl msg $iface: setpromisc 1 || return
+ ngctl msg $iface: setautosrc 0 || return
+
+ # 3. Make sure the interface has been bridged
+ if ! ngctl info ${iface}bridge: > /dev/null 2>&1; then
+ ngctl mkpeer $iface: bridge lower link0 || return
+ ngctl connect $iface: $iface:lower upper link1 ||
+ return
+ ngctl name $iface:lower ${iface}bridge || return
+ fi
+
+ # 3.5. Optionally create a secondary bridge
+ if [ "$bridge" != "bridge" ] &&
+ ! ngctl info "$iface$bridge:" > /dev/null 2>&1
+ then
+ num=2
+ while ngctl msg ${iface}bridge: getstats $num \
+ > /dev/null 2>&1
+ do
+ num=$(( $num + 1 ))
+ done
+ ngctl mkpeer $iface:lower bridge link$num link1 ||
+ return
+ ngctl name ${iface}bridge:link$num "$iface$bridge" ||
+ return
+ fi
+
+ # 4. Create a new interface to the bridge
+ num=2
+ while ngctl msg "$iface$bridge:" getstats $num > /dev/null 2>&1
+ do
+ num=$(( $num + 1 ))
+ done
+ ngctl mkpeer "$iface$bridge:" eiface link$num ether || return
+
+ # 5. Rename the new interface
+ while [ ${#eiface} -gt 15 ]; do # OS limitation
+ eiface=${eiface%?}
+ done
+ new=$( set -- `ngctl show -n "$iface$bridge:link$num"` &&
+ echo $2 ) || return
+ ngctl name "$iface$bridge:link$num" $eiface || return
+ ifconfig $new name $eiface || return
+
+ #
+ # 6. Set the MAC address of the new interface using a sensible
+ # algorithm to prevent conflicts on the network.
+ #
+ # The formula I'm using is ``SP:SS:SI:II:II:II'' where:
+ # + S denotes 16 bits of sum(1) data, split because P (below).
+ # + P denotes the special nibble whose value, if one of
+ # 2, 6, A, or E (but usually 2) denotes a privately
+ # administered MAC address (while remaining routable).
+ # + I denotes bits that are inherited from parent interface.
+ #
+ # The S bits are a CRC-16 checksum of NAME, allowing the jail
+ # to change link numbers in ng_bridge(4) without affecting the
+ # MAC address. Meanwhile, if the jail NAME changes (e.g., it
+ # was duplicated and given a new name with no other changes),
+ # the underlying network interface changes, or the jail is
+ # moved to another host, the MAC address will be recalculated
+ # to a new, similarly unique value preventing conflict.
+ #
+ iface_devid=$( ifconfig $iface ether | awk '/ether/,$0=$2' )
+ eiface_devid=${iface_devid#??:??:?}
+ num=$( set -- `echo -n $name | sum` && echo $1 )
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid=:$quad$eiface_devid
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid=$quad$eiface_devid
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid=2:$quad$eiface_devid
+ num=$(( $num >> 4 ))
+ quad=$(( $num & 15 ))
+ case "$quad" in
+ 10) quad=a ;; 11) quad=b ;; 12) quad=c ;;
+ 13) quad=d ;; 14) quad=e ;; 15) quad=f ;;
+ esac
+ eiface_devid=$quad$eiface_devid
+ ifconfig $eiface ether $eiface_devid > /dev/null 2>&1
+
+ i=$(( $i + 1 )) # on to next ng{i}_name
+ done # for iface
+}
+
+jng_graph_usage="graph [-f] [-T type] [-o output]"
+jng_graph_descr="Generate network graph (default output is \`jng.svg')"
+jng_graph()
+{
+ local OPTIND=1 OPTARG flag
+ local output=jng.svg output_type= force=
+ while getopts fo:T: flag; do
+ case "$flag" in
+ f) force=1 ;;
+ o) output="$OPTARG" ;;
+ T) output_type="$OPTARG" ;;
+ *) action_usage graph # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND - 1 ))
+ [ $# -eq 0 -a "$output" ] || action_usage graph # NOTREACHED
+ mustberoot_to_continue
+ if [ -e "$output" -a ! "$force" ]; then
+ echo "$output: Already exists (use \`-f' to overwrite)" >&2
+ return $FAILURE
+ fi
+ if [ ! "$output_type" ]; then
+ local valid suffix
+ valid=$( dot -Txxx 2>&1 )
+ for suffix in ${valid##*:}; do
+ [ "$output" != "${output%.$suffix}" ] || continue
+ output_type=$suffix
+ break
+ done
+ fi
+ ngctl dot | dot ${output_type:+-T "$output_type"} -o "$output"
+}
+
+jng_show_usage="show"
+jng_show_descr="List possible NAME values for \`show NAME'"
+jng_show1_usage="show NAME"
+jng_show1_descr="Lists ng0_NAME [ng1_NAME ...]"
+jng_show2_usage="show [NAME]"
+jng_show()
+{
+ local OPTIND=1 OPTARG flag
+ while getopts "" flag; do
+ case "$flag" in
+ *) action_usage show2 # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND - 1 ))
+ mustberoot_to_continue
+ if [ $# -eq 0 ]; then
+ ngctl ls | awk '$4=="bridge",$0=$2' |
+ xargs -rn1 -Ibridge ngctl show bridge: |
+ awk 'sub(/^ng[[:digit:]]+_/, "", $2), $0 = $2' |
+ sort -u
+ return
+ fi
+ ngctl ls | awk -v name="$1" '
+ match($2, /^ng[[:digit:]]+_/) &&
+ substr($2, RSTART + RLENGTH) == name &&
+ $4 == "eiface", $0 = $2
+ ' | sort
+}
+
+jng_shutdown_usage="shutdown NAME"
+jng_shutdown_descr="Shutdown ng0_NAME [ng1_NAME ...]"
+jng_shutdown()
+{
+ local OPTIND=1 OPTARG flag
+ while getopts "" flag; do
+ case "$flag" in
+ *) action_usage shutdown # NOTREACHED
+ esac
+ done
+ shift $(( $OPTIND -1 ))
+ local name="$1"
+ [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -eq 1 ] ||
+ action_usage shutdown # NOTREACHED
+ mustberoot_to_continue
+ jng_show "$name" | xargs -rn1 -I eiface ngctl shutdown eiface:
+}
+
+############################################################ MAIN
+
+#
+# Command-line arguments
+#
+action="$1"
+[ "$action" ] || usage # NOTREACHED
+
+#
+# Validate action argument
+#
+if [ "$BASH_VERSION" ]; then
+ type="$( type -t "jng_$action" )" || usage # NOTREACHED
+else
+ type="$( type "jng_$action" 2> /dev/null )" || usage # NOTREACHED
+fi
+case "$type" in
+*function)
+ shift 1 # action
+ eval "jng_$action" \"\$@\"
+ ;;
+*) usage # NOTREACHED
+esac
+
+################################################################################
+# END
+################################################################################
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