net/ipv6/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # IPv6 configuration
   4 #
   5
   6 #   IPv6 as module will cause a CRASH if you try to unload it
   7 menuconfig IPV6
   8         tristate "The IPv6 protocol"
   9         default y
  10         ---help---
  11           Support for IP version 6 (IPv6).
  12
  13           For general information about IPv6, see
  14           <https://en.wikipedia.org/wiki/IPv6>.
  15           For specific information about IPv6 under Linux, see
  16           Documentation/networking/ipv6.rst and read the HOWTO at
  17           <http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
  18
  19           To compile this protocol support as a module, choose M here: the
  20           module will be called ipv6.
  21
  22 if IPV6
  23
  24 config IPV6_ROUTER_PREF
  25         bool "IPv6: Router Preference (RFC 4191) support"
  26         ---help---
  27           Router Preference is an optional extension to the Router
  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.
  31
  32           If unsure, say N.
  33
  34 config IPV6_ROUTE_INFO
  35         bool "IPv6: Route Information (RFC 4191) support"
  36         depends on IPV6_ROUTER_PREF
  37         ---help---
  38           Support of Route Information.
  39
  40           If unsure, say N.
  41
  42 config IPV6_OPTIMISTIC_DAD
  43         bool "IPv6: Enable RFC 4429 Optimistic DAD"
  44         ---help---
  45           Support for optimistic Duplicate Address Detection. It allows for
  46           autoconfigured addresses to be used more quickly.
  47
  48           If unsure, say N.
  49
  50 config INET6_AH
  51         tristate "IPv6: AH transformation"
  52         select XFRM_ALGO
  53         select CRYPTO
  54         select CRYPTO_HMAC
  55         select CRYPTO_MD5
  56         select CRYPTO_SHA1
  57         ---help---
  58           Support for IPsec AH.
  59
  60           If unsure, say Y.
  61
  62 config INET6_ESP
  63         tristate "IPv6: ESP transformation"
  64         select XFRM_ALGO
  65         select CRYPTO
  66         select CRYPTO_AUTHENC
  67         select CRYPTO_HMAC
  68         select CRYPTO_MD5
  69         select CRYPTO_CBC
  70         select CRYPTO_SHA1
  71         select CRYPTO_DES
  72         select CRYPTO_ECHAINIV
  73         ---help---
  74           Support for IPsec ESP.
  75
  76           If unsure, say Y.
  77
  78 config INET6_ESP_OFFLOAD
  79         tristate "IPv6: ESP transformation offload"
  80         depends on INET6_ESP
  81         select XFRM_OFFLOAD
  82         default n
  83         ---help---
  84           Support for ESP transformation offload. This makes sense
  85           only if this system really does IPsec and want to do it
  86           with high throughput. A typical desktop system does not
  87           need it, even if it does IPsec.
  88
  89           If unsure, say N.
  90
  91 config INET6_IPCOMP
  92         tristate "IPv6: IPComp transformation"
  93         select INET6_XFRM_TUNNEL
  94         select XFRM_IPCOMP
  95         ---help---
  96           Support for IP Payload Compression Protocol (IPComp) (RFC3173),
  97           typically needed for IPsec.
  98
  99           If unsure, say Y.
 100
 101 config IPV6_MIP6
 102         tristate "IPv6: Mobility"
 103         select XFRM
 104         ---help---
 105           Support for IPv6 Mobility described in RFC 3775.
 106
 107           If unsure, say N.
 108
 109 config IPV6_ILA
 110         tristate "IPv6: Identifier Locator Addressing (ILA)"
 111         depends on NETFILTER
 112         select DST_CACHE
 113         select LWTUNNEL
 114         ---help---
 115           Support for IPv6 Identifier Locator Addressing (ILA).
 116
 117           ILA is a mechanism to do network virtualization without
 118           encapsulation. The basic concept of ILA is that we split an
 119           IPv6 address into a 64 bit locator and 64 bit identifier. The
 120           identifier is the identity of an entity in communication
 121           ("who") and the locator expresses the location of the
 122           entity ("where").
 123
 124           ILA can be configured using the "encap ila" option with
 125           "ip -6 route" command. ILA is described in
 126           https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.
 127
 128           If unsure, say N.
 129
 130 config INET6_XFRM_TUNNEL
 131         tristate
 132         select INET6_TUNNEL
 133         default n
 134
 135 config INET6_TUNNEL
 136         tristate
 137         default n
 138
 139 config IPV6_VTI
 140 tristate "Virtual (secure) IPv6: tunneling"
 141         select IPV6_TUNNEL
 142         select NET_IP_TUNNEL
 143         select XFRM
 144         ---help---
 145         Tunneling means encapsulating data of one protocol type within
 146         another protocol and sending it over a channel that understands the
 147         encapsulating protocol. This can be used with xfrm mode tunnel to give
 148         the notion of a secure tunnel for IPSEC and then use routing protocol
 149         on top.
 150
 151 config IPV6_SIT
 152         tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
 153         select INET_TUNNEL
 154         select NET_IP_TUNNEL
 155         select IPV6_NDISC_NODETYPE
 156         default y
 157         ---help---
 158           Tunneling means encapsulating data of one protocol type within
 159           another protocol and sending it over a channel that understands the
 160           encapsulating protocol. This driver implements encapsulation of IPv6
 161           into IPv4 packets. This is useful if you want to connect two IPv6
 162           networks over an IPv4-only path.
 163
 164           Saying M here will produce a module called sit. If unsure, say Y.
 165
 166 config IPV6_SIT_6RD
 167         bool "IPv6: IPv6 Rapid Deployment (6RD)"
 168         depends on IPV6_SIT
 169         default n
 170         ---help---
 171           IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
 172           mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
 173           deploy IPv6 unicast service to IPv4 sites to which it provides
 174           customer premise equipment.  Like 6to4, it utilizes stateless IPv6 in
 175           IPv4 encapsulation in order to transit IPv4-only network
 176           infrastructure.  Unlike 6to4, a 6rd service provider uses an IPv6
 177           prefix of its own in place of the fixed 6to4 prefix.
 178
 179           With this option enabled, the SIT driver offers 6rd functionality by
 180           providing additional ioctl API to configure the IPv6 Prefix for in
 181           stead of static 2002::/16 for 6to4.
 182
 183           If unsure, say N.
 184
 185 config IPV6_NDISC_NODETYPE
 186         bool
 187
 188 config IPV6_TUNNEL
 189         tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
 190         select INET6_TUNNEL
 191         select DST_CACHE
 192         select GRO_CELLS
 193         ---help---
 194           Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
 195           RFC 2473.
 196
 197           If unsure, say N.
 198
 199 config IPV6_GRE
 200         tristate "IPv6: GRE tunnel"
 201         select IPV6_TUNNEL
 202         select NET_IP_TUNNEL
 203         depends on NET_IPGRE_DEMUX
 204         ---help---
 205           Tunneling means encapsulating data of one protocol type within
 206           another protocol and sending it over a channel that understands the
 207           encapsulating protocol. This particular tunneling driver implements
 208           GRE (Generic Routing Encapsulation) and at this time allows
 209           encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
 210           This driver is useful if the other endpoint is a Cisco router: Cisco
 211           likes GRE much better than the other Linux tunneling driver ("IP
 212           tunneling" above). In addition, GRE allows multicast redistribution
 213           through the tunnel.
 214
 215           Saying M here will produce a module called ip6_gre. If unsure, say N.
 216
 217 config IPV6_FOU
 218         tristate
 219         default NET_FOU && IPV6
 220
 221 config IPV6_FOU_TUNNEL
 222         tristate
 223         default NET_FOU_IP_TUNNELS && IPV6_FOU
 224         select IPV6_TUNNEL
 225
 226 config IPV6_MULTIPLE_TABLES
 227         bool "IPv6: Multiple Routing Tables"
 228         select FIB_RULES
 229         ---help---
 230           Support multiple routing tables.
 231
 232 config IPV6_SUBTREES
 233         bool "IPv6: source address based routing"
 234         depends on IPV6_MULTIPLE_TABLES
 235         ---help---
 236           Enable routing by source address or prefix.
 237
 238           The destination address is still the primary routing key, so mixing
 239           normal and source prefix specific routes in the same routing table
 240           may sometimes lead to unintended routing behavior.  This can be
 241           avoided by defining different routing tables for the normal and
 242           source prefix specific routes.
 243
 244           If unsure, say N.
 245
 246 config IPV6_MROUTE
 247         bool "IPv6: multicast routing"
 248         depends on IPV6
 249         select IP_MROUTE_COMMON
 250         ---help---
 251           Support for IPv6 multicast forwarding.
 252           If unsure, say N.
 253
 254 config IPV6_MROUTE_MULTIPLE_TABLES
 255         bool "IPv6: multicast policy routing"
 256         depends on IPV6_MROUTE
 257         select FIB_RULES
 258         help
 259           Normally, a multicast router runs a userspace daemon and decides
 260           what to do with a multicast packet based on the source and
 261           destination addresses. If you say Y here, the multicast router
 262           will also be able to take interfaces and packet marks into
 263           account and run multiple instances of userspace daemons
 264           simultaneously, each one handling a single table.
 265
 266           If unsure, say N.
 267
 268 config IPV6_PIMSM_V2
 269         bool "IPv6: PIM-SM version 2 support"
 270         depends on IPV6_MROUTE
 271         ---help---
 272           Support for IPv6 PIM multicast routing protocol PIM-SMv2.
 273           If unsure, say N.
 274
 275 config IPV6_SEG6_LWTUNNEL
 276         bool "IPv6: Segment Routing Header encapsulation support"
 277         depends on IPV6
 278         select LWTUNNEL
 279         select DST_CACHE
 280         select IPV6_MULTIPLE_TABLES
 281         ---help---
 282           Support for encapsulation of packets within an outer IPv6
 283           header and a Segment Routing Header using the lightweight
 284           tunnels mechanism. Also enable support for advanced local
 285           processing of SRv6 packets based on their active segment.
 286
 287           If unsure, say N.
 288
 289 config IPV6_SEG6_HMAC
 290         bool "IPv6: Segment Routing HMAC support"
 291         depends on IPV6
 292         select CRYPTO_HMAC
 293         select CRYPTO_SHA1
 294         select CRYPTO_SHA256
 295         ---help---
 296           Support for HMAC signature generation and verification
 297           of SR-enabled packets.
 298
 299           If unsure, say N.
 300
 301 config IPV6_SEG6_BPF
 302         def_bool y
 303         depends on IPV6_SEG6_LWTUNNEL
 304         depends on IPV6 = y
 305
 306 config IPV6_RPL_LWTUNNEL
 307         bool "IPv6: RPL Source Routing Header support"
 308         depends on IPV6
 309         select LWTUNNEL
 310         ---help---
 311           Support for RFC6554 RPL Source Routing Header using the lightweight
 312           tunnels mechanism.
 313
 314           If unsure, say N.
 315
 316 endif # IPV6