#
  # 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.txt 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---
  	  This is experimental support of Route Information.
  
  	  If unsure, say N.

  config IPV6_OPTIMISTIC_DAD

  	bool "IPv6: Enable RFC 4429 Optimistic DAD"

  	---help---
  	  This is experimental 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_ALGO

  	select CRYPTO
  	select CRYPTO_HMAC
  	select CRYPTO_MD5
  	select CRYPTO_SHA1
  	---help---
  	  Support for IPsec AH.
  
  	  If unsure, say Y.
  
  config INET6_ESP
  	tristate "IPv6: ESP transformation"

  	select XFRM_ALGO

  	select CRYPTO

  	select CRYPTO_AUTHENC

  	select CRYPTO_HMAC
  	select CRYPTO_MD5

  	select CRYPTO_CBC

  	select CRYPTO_SHA1
  	select CRYPTO_DES

  	select CRYPTO_ECHAINIV

  	---help---
  	  Support for IPsec ESP.
  
  	  If unsure, say Y.
  
  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 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 INET6_XFRM_MODE_TRANSPORT
  	tristate "IPv6: IPsec transport mode"

  	default IPV6
  	select XFRM
  	---help---
  	  Support for IPsec transport mode.
  
  	  If unsure, say Y.
  
  config INET6_XFRM_MODE_TUNNEL
  	tristate "IPv6: IPsec tunnel mode"

  	default IPV6
  	select XFRM
  	---help---
  	  Support for IPsec tunnel mode.
  
  	  If unsure, say Y.

  config INET6_XFRM_MODE_BEET
  	tristate "IPv6: IPsec BEET mode"

  	default IPV6
  	select XFRM
  	---help---
  	  Support for IPsec BEET mode.
  
  	  If unsure, say Y.

  config INET6_XFRM_MODE_ROUTEOPTIMIZATION

  	tristate "IPv6: MIPv6 route optimization mode"

  	select XFRM
  	---help---
  	  Support for MIPv6 route optimization mode.

  config IPV6_VTI
  tristate "Virtual (secure) IPv6: tunneling"
  	select IPV6_TUNNEL

  	select NET_IP_TUNNEL

  	depends on INET6_XFRM_MODE_TUNNEL
  	---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

  	---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

  	---help---
  	  Experimental 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.

  endif # IPV6