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				.\"-
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				.\"
				gbeUnsubmitted Done Inline Actions The "All rights reserved." should be dropped. gbe: The "All rights reserved." should be dropped.
				afedorovUnsubmitted Done Inline Actions While we're here, maybe it should be added: "SPDX-License-Identifier: BSD-2-Clause-FreeBSD" afedorov: While we're here, maybe it should be added: "SPDX-License-Identifier: BSD-2-Clause-FreeBSD"
				.\" Copyright (c) 2019 IKS Service GmbH
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				.\" Author: Lutz Donnerhacke <lutz@donnerhacke.de>
				.\"
				.\" $FreeBSD$
				.\"
				.Dd November 20, 2020
				.Dt NG_VLAN_ROTATE 4
				.Os
				.Sh NAME
				.Nm ng_vlan_rotate
				.Nd IEEE 802.1ad VLAN manipulation netgraph node type
				.Sh SYNOPSIS
				.In sys/types.h
				.In netgraph.h
				.In netgraph/ng_vlan_rotate.h
				.Sh DESCRIPTION
				The
				.Nm vlan_rotate
				node type manipulates the order of VLAN tags of frames tagged
				according to the IEEE 802.1ad (an extension of IEEE 802.1Q) standard
				between different hooks.
				.Pp
				Each node has four special hooks,
				.Va original ,
				.Va ordered ,
				.Va excessive ,
				and
				.Va incomplete .
				.Pp
				A frame tagged with an arbitrary number of
				.Dv ETHERTYPE_VLAN ,
				.Dv ETHERTYPE_QINQ ,
				and
				.Dv 0x9100
				tags received on the
				.Va original
				hook will be rearranged to a new order of those tags and is sent out
				the
				.Dq ordered
				hook.
				After successful processing the
				.Va histogram
				counter for the observed stack size increments.
				.Pp
				If it contains fewer VLANs in the stack, than the configured
				.Va min
				bruefferUnsubmitted Done Inline Actions Stray comma after stack. brueffer: Stray comma after stack.
				limit, the frame is sent out to the
				.Va incomplete
				hook and the
				.Va incomplete
				counter increments.
				.Pp
				bruefferUnsubmitted Done Inline Actions stray comma brueffer: stray comma
				If there are more VLANs in the stack than the configured
				.Va max
				limit, the frame is sent out to the
				.Va excessive
				hook and the
				.Va excessive
				counter increments.
				.Pp
				If the destination hook is not connected, the frame is dropped and the
				.Va drops
				counter increments.
				.Pp
				For Ethernet frames received on the
				.Va ordered
				hook, the transformation is reversed and is passed to the
				.Va original
				hook.
				bruefferUnsubmitted Done Inline Actions stray comma brueffer: stray comma
				Please note that this process is identical to the one described
				above, besides the ordered/original hooks are swapped and the
				transformation is reversed.
				.Pp
				bruefferUnsubmitted Done Inline Actions on -> on the brueffer: on -> on the
				An Ethernet frame received on the
				.Va incomplete
				or
				.Va excessive
				hook is forwarded to the
				.Va original
				hook without any modification.
				.Pp
				This node supports only one operation at the moment: Rotation of the
				VLANs in the stack.
				Setting the configuration parameter
				.Va rot
				to a positive value, the stack will roll up by this amount.
				Negative values will roll down.
				A typical scenario is setting the value to 1 in order to bring the
				innermost VLAN tag to the outmost level.
				Rotation includes the VLAN id, the ether type, and the QOS parameters
				pcp and cfi.
				Typical QOS handling refers to the outmost setting, so be careful to
				keep your QOS intact.
				.Sh HOOKS
				This node type supports the following hooks:
				.Bl -tag -width incomplete
				.It Va original
				Typically this hook would be connected to a
				.Xr ng_ether 4
				node, using the
				.Va lower
				hook connected to a carrier network.
				.It Va ordered
				Typically this hook would be connected to a
				.Xr ng_vlan 4
				type node using the
				.Va downstream
				hook in order to separate services.
				.It Va excessive
				see below.
				.It Va incomplete
				Typically those hooks would be attached to a
				.Xr ng_eiface 4
				type node using the
				.Va ether
				hook for anomaly monitoring purposes.
				.El
				.Sh CONTROL MESSAGES
				This node type supports the generic control messages, plus the following:
				.Bl -tag -width foo
				.It Dv NGM_VLANROTATE_GET_CONF Pq Ic getconf
				Read the current configuration.
				.It Dv NGM_VLANROTATE_SET_CONF Pq Ic setconf
				Set the current configuration.
				.It Dv NGM_VLANROTATE_GET_STAT Pq Ic getstat
				Read the current statistics.
				.It Dv NGM_VLANROTATE_CLR_STAT Pq Ic clrstat
				Zeroize the statistics.
				.It Dv NGM_VLANROTATE_GETCLR_STAT Pq Ic getclrstat
				Read the current statistics and zeroize it in one step.
				.El
				.Sh EXAMPLES
				The first example demonstrates how to rotate double or triple tagged
				bruefferUnsubmitted Done Inline Actions stray comma brueffer: stray comma
				frames so that the innermost C-VLAN can be used as service
				discriminator.
				The single or double tagged frames (C-VLAN removed) are sent out to an
				interface pointing to different infrastucture.
				.Bd -literal
				#!/bin/sh

				BNG_IF=ixl3
				VOIP_IF=bge2

				ngctl -f- <<EOF
				mkpeer ${BNG_IF}: vlan_rotate lower original
				name ${BNG_IF}:lower rotate
				msg rotate: setconf { min=2 max=3 rot=1 }
				mkpeer rotate: vlan ordered downstream
				name rotate:ordered services
				connect services: ${VOIP_IF} voip lower
				msg services: addfilter { vlan=123 hook="voip" }
				EOF
				.Ed
				.Pp
				Now inject the following sample frame on the
				.Dv BNG_IF
				interface:
				.Bd -literal
				00:00:00:00:01:01 > 00:01:02:03:04:05,
				ethertype 802.1Q-9100 (0x9100), length 110: vlan 2, p 1,
				ethertype 802.1Q-QinQ, vlan 101, p 0,
				ethertype 802.1Q, vlan 123, p 7,
				ethertype IPv4, (tos 0x0, ttl 64, id 15994, offset 0, flags [none],
				proto ICMP (1), length 84) 192.168.140.101 > 192.168.140.1:
				ICMP echo request, id 40234, seq 0, length 64
				.Ed
				.Pp
				The frame ejected on the
				.Va ordered
				hook will look like this:
				.Bd -literal
				00:00:00:00:01:01 > 00:01:02:03:04:05,
				ethertype 802.1Q (0x8100), length 110: vlan 123, p 7,
				ethertype 802.1Q-9100, vlan 2, p 1,
				ethertype 802.1Q-QinQ, vlan 101, p 0,
				ethertype IPv4, (tos 0x0, ttl 64, id 15994, offset 0, flags [none],
				proto ICMP (1), length 84) 192.168.140.101 > 192.168.140.1:
				ICMP echo request, id 40234, seq 0, length 64
				.Ed
				.Pp
				Hence, the frame pushed out to the
				.Dv VOIP_IF
				will have this form:
				.Bd -literal
				00:00:00:00:01:01 > 00:01:02:03:04:05,
				ethertype 802.1Q-9100, vlan 2, p 1,
				ethertype 802.1Q-QinQ, vlan 101, p 0,
				ethertype IPv4, (tos 0x0, ttl 64, id 15994, offset 0, flags [none],
				proto ICMP (1), length 84) 192.168.140.101 > 192.168.140.1:
				ICMP echo request, id 40234, seq 0, length 64
				.Ed
				.Pp
				The second example distinguishes between double tagged and single
				tagged frames.
				.Bd -literal
				#!/bin/sh

				IN_IF=bge1

				ngctl -f- <<EOF
				mkpeer ${IN_IF}: vlan_rotate lower original
				name ${IN_IF}:lower separate
				msg separate: setconf { min=1 max=1 rot=0 }
				mkpeer separate: eiface incomplete ether
				name separate:incomplete untagged
				mkpeer separate: eiface ordered ether
				name separate:ordered tagged
				EOF
				.Ed
				.Pp
				Setting the
				.Va rot
				parameter to zero (or omitting it) does not change
				the order of the tags within the frame.
				Frames with more VLAN tags are dropped.
				.Sh SHUTDOWN
				This node shuts down upon receipt of a
				.Dv NGM_SHUTDOWN
				control message, or when all hooks have been disconnected.
				.Sh SEE ALSO
				.Xr netgraph 4 ,
				.Xr ng_eiface 4 ,
				.Xr ng_ether 4 ,
				.Xr ng_vlan 4 ,
				.Xr ngctl 8
				.Sh HISTORY
				The
				.Nm ng_vlan_rotate
				node type appeared in
				bruefferUnsubmitted Done Inline Actions This can simply be ".Fx 12.1", we don't count prereleases, betas etc here. brueffer: This can simply be ".Fx 12.1", we don't count prereleases, betas etc here.
				bruefferUnsubmitted Done Inline Actions This can simply be .Nm brueffer: This can simply be .Nm
				bruefferUnsubmitted Not Done Inline Actions You fixed a different .Nm than the one I pointed out ;-) This one in HISTORY can be simply .Nm as well. brueffer: You fixed a different .Nm than the one I pointed out ;-) This one in HISTORY can be simply .Nm…
				.Fx 12.1 .
				.Sh AUTHORS
				.An Lutz Donnerhacke Aq Mt lutz@donnerhacke.de