[linux-block.git] / net / ipv6 / Kconfig

# SPDX-License-Identifier: GPL-2.0-only
#
# IPv6 configuration
#

#   IPv6 as module will cause a CRASH if you try to unload it
menuconfig IPV6
	tristate "The IPv6 protocol"
	default y
	---help---
	  Support for IP version 6 (IPv6).

	  For general information about IPv6, see
	  <https://en.wikipedia.org/wiki/IPv6>.
	  For specific information about IPv6 under Linux, see
	  Documentation/networking/ipv6.rst and read the HOWTO at
	  <http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>

	  To compile this protocol support as a module, choose M here: the
	  module will be called ipv6.

if IPV6

config IPV6_ROUTER_PREF
	bool "IPv6: Router Preference (RFC 4191) support"
	---help---
	  Router Preference is an optional extension to the Router
	  Advertisement message which improves the ability of hosts
	  to pick an appropriate router, especially when the hosts
	  are placed in a multi-homed network.

	  If unsure, say N.

config IPV6_ROUTE_INFO
	bool "IPv6: Route Information (RFC 4191) support"
	depends on IPV6_ROUTER_PREF
	---help---
	  Support of Route Information.

	  If unsure, say N.

config IPV6_OPTIMISTIC_DAD
	bool "IPv6: Enable RFC 4429 Optimistic DAD"
	---help---
	  Support for optimistic Duplicate Address Detection. It allows for
	  autoconfigured addresses to be used more quickly.

	  If unsure, say N.

config INET6_AH
	tristate "IPv6: AH transformation"
	select XFRM_AH
	---help---
	  Support for IPsec AH (Authentication Header).

	  AH can be used with various authentication algorithms.  Besides
	  enabling AH support itself, this option enables the generic
	  implementations of the algorithms that RFC 8221 lists as MUST be
	  implemented.  If you need any other algorithms, you'll need to enable
	  them in the crypto API.  You should also enable accelerated
	  implementations of any needed algorithms when available.

	  If unsure, say Y.

config INET6_ESP
	tristate "IPv6: ESP transformation"
	select XFRM_ESP
	---help---
	  Support for IPsec ESP (Encapsulating Security Payload).

	  ESP can be used with various encryption and authentication algorithms.
	  Besides enabling ESP support itself, this option enables the generic
	  implementations of the algorithms that RFC 8221 lists as MUST be
	  implemented.  If you need any other algorithms, you'll need to enable
	  them in the crypto API.  You should also enable accelerated
	  implementations of any needed algorithms when available.

	  If unsure, say Y.

config INET6_ESP_OFFLOAD
	tristate "IPv6: ESP transformation offload"
	depends on INET6_ESP
	select XFRM_OFFLOAD
	default n
	---help---
	  Support for ESP transformation offload. This makes sense
	  only if this system really does IPsec and want to do it
	  with high throughput. A typical desktop system does not
	  need it, even if it does IPsec.

	  If unsure, say N.

config INET6_ESPINTCP
	bool "IPv6: ESP in TCP encapsulation (RFC 8229)"
	depends on XFRM && INET6_ESP
	select STREAM_PARSER
	select NET_SOCK_MSG
	select XFRM_ESPINTCP
	help
	  Support for RFC 8229 encapsulation of ESP and IKE over
	  TCP/IPv6 sockets.

	  If unsure, say N.

config INET6_IPCOMP
	tristate "IPv6: IPComp transformation"
	select INET6_XFRM_TUNNEL
	select XFRM_IPCOMP
	---help---
	  Support for IP Payload Compression Protocol (IPComp) (RFC3173),
	  typically needed for IPsec.

	  If unsure, say Y.

config IPV6_MIP6
	tristate "IPv6: Mobility"
	select XFRM
	---help---
	  Support for IPv6 Mobility described in RFC 3775.

	  If unsure, say N.

config IPV6_ILA
	tristate "IPv6: Identifier Locator Addressing (ILA)"
	depends on NETFILTER
	select DST_CACHE
	select LWTUNNEL
	---help---
	  Support for IPv6 Identifier Locator Addressing (ILA).

	  ILA is a mechanism to do network virtualization without
	  encapsulation. The basic concept of ILA is that we split an
	  IPv6 address into a 64 bit locator and 64 bit identifier. The
	  identifier is the identity of an entity in communication
	  ("who") and the locator expresses the location of the
	  entity ("where").

	  ILA can be configured using the "encap ila" option with
	  "ip -6 route" command. ILA is described in
	  https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.

	  If unsure, say N.

config INET6_XFRM_TUNNEL
	tristate
	select INET6_TUNNEL
	default n

config INET6_TUNNEL
	tristate
	default n

config IPV6_VTI
tristate "Virtual (secure) IPv6: tunneling"
	select IPV6_TUNNEL
	select NET_IP_TUNNEL
	select XFRM
	---help---
	Tunneling means encapsulating data of one protocol type within
	another protocol and sending it over a channel that understands the
	encapsulating protocol. This can be used with xfrm mode tunnel to give
	the notion of a secure tunnel for IPSEC and then use routing protocol
	on top.

config IPV6_SIT
	tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
	select INET_TUNNEL
	select NET_IP_TUNNEL
	select IPV6_NDISC_NODETYPE
	default y
	---help---
	  Tunneling means encapsulating data of one protocol type within
	  another protocol and sending it over a channel that understands the
	  encapsulating protocol. This driver implements encapsulation of IPv6
	  into IPv4 packets. This is useful if you want to connect two IPv6
	  networks over an IPv4-only path.

	  Saying M here will produce a module called sit. If unsure, say Y.

config IPV6_SIT_6RD
	bool "IPv6: IPv6 Rapid Deployment (6RD)"
	depends on IPV6_SIT
	default n
	---help---
	  IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
	  mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
	  deploy IPv6 unicast service to IPv4 sites to which it provides
	  customer premise equipment.  Like 6to4, it utilizes stateless IPv6 in
	  IPv4 encapsulation in order to transit IPv4-only network
	  infrastructure.  Unlike 6to4, a 6rd service provider uses an IPv6
	  prefix of its own in place of the fixed 6to4 prefix.

	  With this option enabled, the SIT driver offers 6rd functionality by
	  providing additional ioctl API to configure the IPv6 Prefix for in
	  stead of static 2002::/16 for 6to4.

	  If unsure, say N.

config IPV6_NDISC_NODETYPE
	bool

config IPV6_TUNNEL
	tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
	select INET6_TUNNEL
	select DST_CACHE
	select GRO_CELLS
	---help---
	  Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
	  RFC 2473.

	  If unsure, say N.

config IPV6_GRE
	tristate "IPv6: GRE tunnel"
	select IPV6_TUNNEL
	select NET_IP_TUNNEL
	depends on NET_IPGRE_DEMUX
	---help---
	  Tunneling means encapsulating data of one protocol type within
	  another protocol and sending it over a channel that understands the
	  encapsulating protocol. This particular tunneling driver implements
	  GRE (Generic Routing Encapsulation) and at this time allows
	  encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
	  This driver is useful if the other endpoint is a Cisco router: Cisco
	  likes GRE much better than the other Linux tunneling driver ("IP
	  tunneling" above). In addition, GRE allows multicast redistribution
	  through the tunnel.

	  Saying M here will produce a module called ip6_gre. If unsure, say N.

config IPV6_FOU
	tristate
	default NET_FOU && IPV6

config IPV6_FOU_TUNNEL
	tristate
	default NET_FOU_IP_TUNNELS && IPV6_FOU
	select IPV6_TUNNEL

config IPV6_MULTIPLE_TABLES
	bool "IPv6: Multiple Routing Tables"
	select FIB_RULES
	---help---
	  Support multiple routing tables.

config IPV6_SUBTREES
	bool "IPv6: source address based routing"
	depends on IPV6_MULTIPLE_TABLES
	---help---
	  Enable routing by source address or prefix.

	  The destination address is still the primary routing key, so mixing
	  normal and source prefix specific routes in the same routing table
	  may sometimes lead to unintended routing behavior.  This can be
	  avoided by defining different routing tables for the normal and
	  source prefix specific routes.

	  If unsure, say N.

config IPV6_MROUTE
	bool "IPv6: multicast routing"
	depends on IPV6
	select IP_MROUTE_COMMON
	---help---
	  Support for IPv6 multicast forwarding.
	  If unsure, say N.

config IPV6_MROUTE_MULTIPLE_TABLES
	bool "IPv6: multicast policy routing"
	depends on IPV6_MROUTE
	select FIB_RULES
	help
	  Normally, a multicast router runs a userspace daemon and decides
	  what to do with a multicast packet based on the source and
	  destination addresses. If you say Y here, the multicast router
	  will also be able to take interfaces and packet marks into
	  account and run multiple instances of userspace daemons
	  simultaneously, each one handling a single table.

	  If unsure, say N.

config IPV6_PIMSM_V2
	bool "IPv6: PIM-SM version 2 support"
	depends on IPV6_MROUTE
	---help---
	  Support for IPv6 PIM multicast routing protocol PIM-SMv2.
	  If unsure, say N.

config IPV6_SEG6_LWTUNNEL
	bool "IPv6: Segment Routing Header encapsulation support"
	depends on IPV6
	select LWTUNNEL
	select DST_CACHE
	select IPV6_MULTIPLE_TABLES
	---help---
	  Support for encapsulation of packets within an outer IPv6
	  header and a Segment Routing Header using the lightweight
	  tunnels mechanism. Also enable support for advanced local
	  processing of SRv6 packets based on their active segment.

	  If unsure, say N.

config IPV6_SEG6_HMAC
	bool "IPv6: Segment Routing HMAC support"
	depends on IPV6
	select CRYPTO_HMAC
	select CRYPTO_SHA1
	select CRYPTO_SHA256
	---help---
	  Support for HMAC signature generation and verification
	  of SR-enabled packets.

	  If unsure, say N.

config IPV6_SEG6_BPF
	def_bool y
	depends on IPV6_SEG6_LWTUNNEL
	depends on IPV6 = y

config IPV6_RPL_LWTUNNEL
	bool "IPv6: RPL Source Routing Header support"
	depends on IPV6
	select LWTUNNEL
	---help---
	  Support for RFC6554 RPL Source Routing Header using the lightweight
	  tunnels mechanism.

	  If unsure, say N.

endif # IPV6
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	#
1da177e4 LT	3	# IPv6 configuration
6a2e9b73 SR	4	#
	5
	6	# IPv6 as module will cause a CRASH if you try to unload it
0b18542b	7	menuconfig IPV6
6a2e9b73	8	tristate "The IPv6 protocol"
de551f2e	9	default y
6a2e9b73	10	---help---
de551f2e	11	Support for IP version 6 (IPv6).
6a2e9b73 SR	12
6a2e9b73 SR	13	For general information about IPv6, see
242260fb	14	<https://en.wikipedia.org/wiki/IPv6>.
de551f2e	15	For specific information about IPv6 under Linux, see
19093313	16	Documentation/networking/ipv6.rst and read the HOWTO at
de551f2e	17	<http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
6a2e9b73	18
e446a276	19	To compile this protocol support as a module, choose M here: the
6a2e9b73 SR	20	module will be called ipv6.
6a2e9b73 SR	21
0b18542b JE	22	if IPV6
0b18542b JE	23
ebacaaa0 YH	24	config IPV6_ROUTER_PREF
ebacaaa0 YH	25	bool "IPv6: Router Preference (RFC 4191) support"
ebacaaa0 YH	26	---help---
ebacaaa0 YH	27	Router Preference is an optional extension to the Router
692105b8 ML	28	Advertisement message which improves the ability of hosts
	29	to pick an appropriate router, especially when the hosts
	30	are placed in a multi-homed network.
ebacaaa0 YH	31
	32	If unsure, say N.
	33
70ceb4f5	34	config IPV6_ROUTE_INFO
f9ceb16e KC	35	bool "IPv6: Route Information (RFC 4191) support"
f9ceb16e KC	36	depends on IPV6_ROUTER_PREF
70ceb4f5	37	---help---
a9f71d0d	38	Support of Route Information.
70ceb4f5 YH	39
	40	If unsure, say N.
	41
95c385b4	42	config IPV6_OPTIMISTIC_DAD
f9ceb16e	43	bool "IPv6: Enable RFC 4429 Optimistic DAD"
95c385b4	44	---help---
a9f71d0d GH	45	Support for optimistic Duplicate Address Detection. It allows for
a9f71d0d GH	46	autoconfigured addresses to be used more quickly.
95c385b4 NH	47
	48	If unsure, say N.
	49
1da177e4 LT	50	config INET6_AH
1da177e4 LT	51	tristate "IPv6: AH transformation"
7d4e3919	52	select XFRM_AH
1da177e4	53	---help---
be013698 EB	54	Support for IPsec AH (Authentication Header).
	55
	56	AH can be used with various authentication algorithms. Besides
	57	enabling AH support itself, this option enables the generic
	58	implementations of the algorithms that RFC 8221 lists as MUST be
	59	implemented. If you need any other algorithms, you'll need to enable
	60	them in the crypto API. You should also enable accelerated
	61	implementations of any needed algorithms when available.
1da177e4 LT	62
	63	If unsure, say Y.
	64
	65	config INET6_ESP
	66	tristate "IPv6: ESP transformation"
7d4e3919	67	select XFRM_ESP
1da177e4	68	---help---
be013698 EB	69	Support for IPsec ESP (Encapsulating Security Payload).
	70
	71	ESP can be used with various encryption and authentication algorithms.
	72	Besides enabling ESP support itself, this option enables the generic
	73	implementations of the algorithms that RFC 8221 lists as MUST be
	74	implemented. If you need any other algorithms, you'll need to enable
	75	them in the crypto API. You should also enable accelerated
	76	implementations of any needed algorithms when available.
1da177e4 LT	77
	78	If unsure, say Y.
	79
7785bba2 SK	80	config INET6_ESP_OFFLOAD
	81	tristate "IPv6: ESP transformation offload"
	82	depends on INET6_ESP
	83	select XFRM_OFFLOAD
	84	default n
	85	---help---
	86	Support for ESP transformation offload. This makes sense
	87	only if this system really does IPsec and want to do it
	88	with high throughput. A typical desktop system does not
	89	need it, even if it does IPsec.
	90
	91	If unsure, say N.
	92
26333c37 SD	93	config INET6_ESPINTCP
	94	bool "IPv6: ESP in TCP encapsulation (RFC 8229)"
	95	depends on XFRM && INET6_ESP
	96	select STREAM_PARSER
	97	select NET_SOCK_MSG
	98	select XFRM_ESPINTCP
	99	help
	100	Support for RFC 8229 encapsulation of ESP and IKE over
	101	TCP/IPv6 sockets.
	102
	103	If unsure, say N.
	104
1da177e4 LT	105	config INET6_IPCOMP
1da177e4 LT	106	tristate "IPv6: IPComp transformation"
d2acc347	107	select INET6_XFRM_TUNNEL
6fccab67	108	select XFRM_IPCOMP
1da177e4 LT	109	---help---
	110	Support for IP Payload Compression Protocol (IPComp) (RFC3173),
	111	typically needed for IPsec.
	112
	113	If unsure, say Y.
	114
ee538268	115	config IPV6_MIP6
f9ceb16e	116	tristate "IPv6: Mobility"
ee538268 MN	117	select XFRM
	118	---help---
	119	Support for IPv6 Mobility described in RFC 3775.
	120
	121	If unsure, say N.
	122
65d7ab8d TH	123	config IPV6_ILA
65d7ab8d TH	124	tristate "IPv6: Identifier Locator Addressing (ILA)"
8cb964da	125	depends on NETFILTER
83ed7d1f	126	select DST_CACHE
65d7ab8d TH	127	select LWTUNNEL
	128	---help---
	129	Support for IPv6 Identifier Locator Addressing (ILA).
	130
	131	ILA is a mechanism to do network virtualization without
	132	encapsulation. The basic concept of ILA is that we split an
	133	IPv6 address into a 64 bit locator and 64 bit identifier. The
	134	identifier is the identity of an entity in communication
	135	("who") and the locator expresses the location of the
	136	entity ("where").
	137
	138	ILA can be configured using the "encap ila" option with
	139	"ip -6 route" command. ILA is described in
	140	https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.
	141
	142	If unsure, say N.
	143
d2acc347 HX	144	config INET6_XFRM_TUNNEL
	145	tristate
	146	select INET6_TUNNEL
	147	default n
	148
1da177e4	149	config INET6_TUNNEL
d2acc347 HX	150	tristate
d2acc347 HX	151	default n
1da177e4	152
ed1efb2a SK	153	config IPV6_VTI
	154	tristate "Virtual (secure) IPv6: tunneling"
	155	select IPV6_TUNNEL
876fc03a	156	select NET_IP_TUNNEL
4c145dce	157	select XFRM
ed1efb2a SK	158	---help---
	159	Tunneling means encapsulating data of one protocol type within
	160	another protocol and sending it over a channel that understands the
	161	encapsulating protocol. This can be used with xfrm mode tunnel to give
	162	the notion of a secure tunnel for IPSEC and then use routing protocol
	163	on top.
	164
989e5b96 JR	165	config IPV6_SIT
989e5b96 JR	166	tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
c73cb5a2	167	select INET_TUNNEL
f61dd388	168	select NET_IP_TUNNEL
de357cc0	169	select IPV6_NDISC_NODETYPE
989e5b96 JR	170	default y
	171	---help---
	172	Tunneling means encapsulating data of one protocol type within
	173	another protocol and sending it over a channel that understands the
	174	encapsulating protocol. This driver implements encapsulation of IPv6
5c5d6dab	175	into IPv4 packets. This is useful if you want to connect two IPv6
989e5b96 JR	176	networks over an IPv4-only path.
989e5b96 JR	177
4737f097	178	Saying M here will produce a module called sit. If unsure, say Y.
989e5b96	179
fa857afc	180	config IPV6_SIT_6RD
f9ceb16e KC	181	bool "IPv6: IPv6 Rapid Deployment (6RD)"
f9ceb16e KC	182	depends on IPV6_SIT
fa857afc YH	183	default n
	184	---help---
	185	IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
	186	mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
	187	deploy IPv6 unicast service to IPv4 sites to which it provides
	188	customer premise equipment. Like 6to4, it utilizes stateless IPv6 in
	189	IPv4 encapsulation in order to transit IPv4-only network
	190	infrastructure. Unlike 6to4, a 6rd service provider uses an IPv6
	191	prefix of its own in place of the fixed 6to4 prefix.
	192
	193	With this option enabled, the SIT driver offers 6rd functionality by
	194	providing additional ioctl API to configure the IPv6 Prefix for in
	195	stead of static 2002::/16 for 6to4.
	196
	197	If unsure, say N.
	198
de357cc0 YH	199	config IPV6_NDISC_NODETYPE
	200	bool
	201
1da177e4	202	config IPV6_TUNNEL
38fe999e	203	tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
d2acc347	204	select INET6_TUNNEL
607f725f	205	select DST_CACHE
97e219b7	206	select GRO_CELLS
1da177e4	207	---help---
38fe999e YH	208	Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
38fe999e YH	209	RFC 2473.
1da177e4 LT	210
	211	If unsure, say N.
	212
c12b395a	213	config IPV6_GRE
	214	tristate "IPv6: GRE tunnel"
	215	select IPV6_TUNNEL
f61dd388	216	select NET_IP_TUNNEL
8bf42e9e	217	depends on NET_IPGRE_DEMUX
c12b395a	218	---help---
	219	Tunneling means encapsulating data of one protocol type within
	220	another protocol and sending it over a channel that understands the
	221	encapsulating protocol. This particular tunneling driver implements
	222	GRE (Generic Routing Encapsulation) and at this time allows
	223	encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
	224	This driver is useful if the other endpoint is a Cisco router: Cisco
	225	likes GRE much better than the other Linux tunneling driver ("IP
	226	tunneling" above). In addition, GRE allows multicast redistribution
	227	through the tunnel.
	228
	229	Saying M here will produce a module called ip6_gre. If unsure, say N.
	230
fabb13db AB	231	config IPV6_FOU
	232	tristate
	233	default NET_FOU && IPV6
	234
	235	config IPV6_FOU_TUNNEL
	236	tristate
	237	default NET_FOU_IP_TUNNELS && IPV6_FOU
95e4daa8	238	select IPV6_TUNNEL
fabb13db	239
264e91b6 VN	240	config IPV6_MULTIPLE_TABLES
264e91b6 VN	241	bool "IPv6: Multiple Routing Tables"
264e91b6 VN	242	select FIB_RULES
	243	---help---
	244	Support multiple routing tables.
	245
4e96c2b4 YH	246	config IPV6_SUBTREES
4e96c2b4 YH	247	bool "IPv6: source address based routing"
264e91b6	248	depends on IPV6_MULTIPLE_TABLES
4e96c2b4 YH	249	---help---
	250	Enable routing by source address or prefix.
	251
	252	The destination address is still the primary routing key, so mixing
	253	normal and source prefix specific routes in the same routing table
	254	may sometimes lead to unintended routing behavior. This can be
	255	avoided by defining different routing tables for the normal and
	256	source prefix specific routes.
	257
	258	If unsure, say N.
	259
7bc570c8	260	config IPV6_MROUTE
f9ceb16e KC	261	bool "IPv6: multicast routing"
f9ceb16e KC	262	depends on IPV6
6853f21f	263	select IP_MROUTE_COMMON
7bc570c8	264	---help---
a9f71d0d	265	Support for IPv6 multicast forwarding.
7bc570c8 YH	266	If unsure, say N.
7bc570c8 YH	267
d1db275d PM	268	config IPV6_MROUTE_MULTIPLE_TABLES
	269	bool "IPv6: multicast policy routing"
	270	depends on IPV6_MROUTE
	271	select FIB_RULES
	272	help
	273	Normally, a multicast router runs a userspace daemon and decides
	274	what to do with a multicast packet based on the source and
	275	destination addresses. If you say Y here, the multicast router
	276	will also be able to take interfaces and packet marks into
	277	account and run multiple instances of userspace daemons
	278	simultaneously, each one handling a single table.
	279
	280	If unsure, say N.
	281
14fb64e1	282	config IPV6_PIMSM_V2
f9ceb16e	283	bool "IPv6: PIM-SM version 2 support"
14fb64e1 YH	284	depends on IPV6_MROUTE
	285	---help---
	286	Support for IPv6 PIM multicast routing protocol PIM-SMv2.
	287	If unsure, say N.
	288
46738b13 DL	289	config IPV6_SEG6_LWTUNNEL
	290	bool "IPv6: Segment Routing Header encapsulation support"
	291	depends on IPV6
	292	select LWTUNNEL
402a5bc4	293	select DST_CACHE
d7a669dd	294	select IPV6_MULTIPLE_TABLES
46738b13 DL	295	---help---
	296	Support for encapsulation of packets within an outer IPv6
	297	header and a Segment Routing Header using the lightweight
d1df6fd8 DL	298	tunnels mechanism. Also enable support for advanced local
d1df6fd8 DL	299	processing of SRv6 packets based on their active segment.
46738b13 DL	300
	301	If unsure, say N.
	302
bf355b8d DL	303	config IPV6_SEG6_HMAC
	304	bool "IPv6: Segment Routing HMAC support"
	305	depends on IPV6
	306	select CRYPTO_HMAC
	307	select CRYPTO_SHA1
	308	select CRYPTO_SHA256
	309	---help---
	310	Support for HMAC signature generation and verification
	311	of SR-enabled packets.
	312
	313	If unsure, say N.
	314
fe94cc29 MX	315	config IPV6_SEG6_BPF
	316	def_bool y
	317	depends on IPV6_SEG6_LWTUNNEL
	318	depends on IPV6 = y
	319
a7a29f9c AA	320	config IPV6_RPL_LWTUNNEL
	321	bool "IPv6: RPL Source Routing Header support"
	322	depends on IPV6
	323	select LWTUNNEL
	324	---help---
	325	Support for RFC6554 RPL Source Routing Header using the lightweight
	326	tunnels mechanism.
	327
	328	If unsure, say N.
	329
0b18542b	330	endif # IPV6