de551f2eb2
This patch makes the default to build IPv6 into the kernel. IPv6 now has significant traction and any remaining vestiges of IPv6 not being provided parity with IPv4 should be swept away. IPv6 is now core to the Internet and kernel. Points on IPv6 adoption: - Per Google statistics, IPv6 usage has reached 7% on the Internet and continues to exhibit an exponential growth rate https://www.google.com/intl/en/ipv6/statistics.html - Just a few days ago ARIN officially depleted its IPv4 pool - IPv6 only data centers are being successfully built (e.g. at Facebook) This patch changes the IPv6 Kconfig for IPV6. Default for CONFIG_IPV6 is set to "y" and the text has been updated to reflect the maturity of IPv6. Impact: Under some circumstances building modules in to kernel might have a performance advantage. In my testing, I did notice a very slight improvement. This will obviously increase the size of the kernel image. In my configuration I see: IPv6 as module: text data bss dec hex filename 9703666 1899288 933888 12536842 bf4c0a vmlinux IPv6 built into kernel text data bss dec hex filename 9436490 1879600 913408 12229498 ba9b7a vmlinux Which increases text size by ~270K (2.8% increase in size for me). If image size is an issue, presumably for a device which does not do IP networking (IMO we should be discouraging IPv4-only devices), IPV6 can be disabled or still built as a module. Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
261 lines
7 KiB
Plaintext
261 lines
7 KiB
Plaintext
#
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# IPv6 configuration
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#
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# IPv6 as module will cause a CRASH if you try to unload it
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menuconfig IPV6
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tristate "The IPv6 protocol"
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default y
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---help---
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Support for IP version 6 (IPv6).
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For general information about IPv6, see
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<https://en.wikipedia.org/wiki/IPv6>.
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For specific information about IPv6 under Linux, see
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Documentation/networking/ipv6.txt and read the HOWTO at
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<http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
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To compile this protocol support as a module, choose M here: the
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module will be called ipv6.
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if IPV6
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config IPV6_ROUTER_PREF
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bool "IPv6: Router Preference (RFC 4191) support"
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---help---
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Router Preference is an optional extension to the Router
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Advertisement message which improves the ability of hosts
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to pick an appropriate router, especially when the hosts
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are placed in a multi-homed network.
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If unsure, say N.
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config IPV6_ROUTE_INFO
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bool "IPv6: Route Information (RFC 4191) support"
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depends on IPV6_ROUTER_PREF
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---help---
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This is experimental support of Route Information.
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If unsure, say N.
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config IPV6_OPTIMISTIC_DAD
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bool "IPv6: Enable RFC 4429 Optimistic DAD"
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---help---
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This is experimental support for optimistic Duplicate
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Address Detection. It allows for autoconfigured addresses
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to be used more quickly.
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If unsure, say N.
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config INET6_AH
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tristate "IPv6: AH transformation"
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select XFRM_ALGO
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select CRYPTO
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select CRYPTO_HMAC
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select CRYPTO_MD5
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select CRYPTO_SHA1
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---help---
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Support for IPsec AH.
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If unsure, say Y.
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config INET6_ESP
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tristate "IPv6: ESP transformation"
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select XFRM_ALGO
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select CRYPTO
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select CRYPTO_AUTHENC
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select CRYPTO_HMAC
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select CRYPTO_MD5
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select CRYPTO_CBC
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select CRYPTO_SHA1
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select CRYPTO_DES
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---help---
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Support for IPsec ESP.
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If unsure, say Y.
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config INET6_IPCOMP
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tristate "IPv6: IPComp transformation"
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select INET6_XFRM_TUNNEL
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select XFRM_IPCOMP
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---help---
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Support for IP Payload Compression Protocol (IPComp) (RFC3173),
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typically needed for IPsec.
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If unsure, say Y.
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config IPV6_MIP6
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tristate "IPv6: Mobility"
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select XFRM
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---help---
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Support for IPv6 Mobility described in RFC 3775.
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If unsure, say N.
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config INET6_XFRM_TUNNEL
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tristate
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select INET6_TUNNEL
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default n
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config INET6_TUNNEL
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tristate
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default n
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config INET6_XFRM_MODE_TRANSPORT
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tristate "IPv6: IPsec transport mode"
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default IPV6
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select XFRM
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---help---
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Support for IPsec transport mode.
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If unsure, say Y.
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config INET6_XFRM_MODE_TUNNEL
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tristate "IPv6: IPsec tunnel mode"
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default IPV6
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select XFRM
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---help---
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Support for IPsec tunnel mode.
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If unsure, say Y.
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config INET6_XFRM_MODE_BEET
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tristate "IPv6: IPsec BEET mode"
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default IPV6
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select XFRM
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---help---
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Support for IPsec BEET mode.
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If unsure, say Y.
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config INET6_XFRM_MODE_ROUTEOPTIMIZATION
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tristate "IPv6: MIPv6 route optimization mode"
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select XFRM
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---help---
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Support for MIPv6 route optimization mode.
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config IPV6_VTI
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tristate "Virtual (secure) IPv6: tunneling"
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select IPV6_TUNNEL
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select NET_IP_TUNNEL
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depends on INET6_XFRM_MODE_TUNNEL
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---help---
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This can be used with xfrm mode tunnel to give
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the notion of a secure tunnel for IPSEC and then use routing protocol
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on top.
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config IPV6_SIT
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tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
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select INET_TUNNEL
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select NET_IP_TUNNEL
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select IPV6_NDISC_NODETYPE
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default y
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---help---
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This driver implements encapsulation of IPv6
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into IPv4 packets. This is useful if you want to connect two IPv6
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networks over an IPv4-only path.
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Saying M here will produce a module called sit. If unsure, say Y.
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config IPV6_SIT_6RD
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bool "IPv6: IPv6 Rapid Deployment (6RD)"
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depends on IPV6_SIT
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default n
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---help---
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IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
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mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
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deploy IPv6 unicast service to IPv4 sites to which it provides
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customer premise equipment. Like 6to4, it utilizes stateless IPv6 in
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IPv4 encapsulation in order to transit IPv4-only network
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infrastructure. Unlike 6to4, a 6rd service provider uses an IPv6
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prefix of its own in place of the fixed 6to4 prefix.
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With this option enabled, the SIT driver offers 6rd functionality by
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providing additional ioctl API to configure the IPv6 Prefix for in
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stead of static 2002::/16 for 6to4.
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If unsure, say N.
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config IPV6_NDISC_NODETYPE
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bool
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config IPV6_TUNNEL
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tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
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select INET6_TUNNEL
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---help---
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Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
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RFC 2473.
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If unsure, say N.
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config IPV6_GRE
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tristate "IPv6: GRE tunnel"
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select IPV6_TUNNEL
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select NET_IP_TUNNEL
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---help---
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Tunneling means encapsulating data of one protocol type within
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another protocol and sending it over a channel that understands the
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encapsulating protocol. This particular tunneling driver implements
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GRE (Generic Routing Encapsulation) and at this time allows
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encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
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This driver is useful if the other endpoint is a Cisco router: Cisco
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likes GRE much better than the other Linux tunneling driver ("IP
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tunneling" above). In addition, GRE allows multicast redistribution
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through the tunnel.
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Saying M here will produce a module called ip6_gre. If unsure, say N.
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config IPV6_MULTIPLE_TABLES
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bool "IPv6: Multiple Routing Tables"
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select FIB_RULES
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---help---
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Support multiple routing tables.
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config IPV6_SUBTREES
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bool "IPv6: source address based routing"
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depends on IPV6_MULTIPLE_TABLES
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---help---
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Enable routing by source address or prefix.
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The destination address is still the primary routing key, so mixing
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normal and source prefix specific routes in the same routing table
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may sometimes lead to unintended routing behavior. This can be
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avoided by defining different routing tables for the normal and
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source prefix specific routes.
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If unsure, say N.
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config IPV6_MROUTE
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bool "IPv6: multicast routing"
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depends on IPV6
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---help---
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Experimental support for IPv6 multicast forwarding.
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If unsure, say N.
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config IPV6_MROUTE_MULTIPLE_TABLES
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bool "IPv6: multicast policy routing"
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depends on IPV6_MROUTE
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select FIB_RULES
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help
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Normally, a multicast router runs a userspace daemon and decides
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what to do with a multicast packet based on the source and
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destination addresses. If you say Y here, the multicast router
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will also be able to take interfaces and packet marks into
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account and run multiple instances of userspace daemons
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simultaneously, each one handling a single table.
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If unsure, say N.
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config IPV6_PIMSM_V2
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bool "IPv6: PIM-SM version 2 support"
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depends on IPV6_MROUTE
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---help---
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Support for IPv6 PIM multicast routing protocol PIM-SMv2.
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If unsure, say N.
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endif # IPV6
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