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           <https://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_AH
  53         help
  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.
  62
  63           If unsure, say Y.
  64
  65 config INET6_ESP
  66         tristate "IPv6: ESP transformation"
  67         select XFRM_ESP
  68         help
  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.
  77
  78           If unsure, say Y.
  79
  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
  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
 105 config INET6_IPCOMP
 106         tristate "IPv6: IPComp transformation"
 107         select INET6_XFRM_TUNNEL
 108         select XFRM_IPCOMP
 109         help
 110           Support for IP Payload Compression Protocol (IPComp) (RFC3173),
 111           typically needed for IPsec.
 112
 113           If unsure, say Y.
 114
 115 config IPV6_MIP6
 116         tristate "IPv6: Mobility"
 117         select XFRM
 118         help
 119           Support for IPv6 Mobility described in RFC 3775.
 120
 121           If unsure, say N.
 122
 123 config IPV6_ILA
 124         tristate "IPv6: Identifier Locator Addressing (ILA)"
 125         depends on NETFILTER
 126         select DST_CACHE
 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
 144 config INET6_XFRM_TUNNEL
 145         tristate
 146         select INET6_TUNNEL
 147         default n
 148
 149 config INET6_TUNNEL
 150         tristate
 151         default n
 152
 153 config IPV6_VTI
 154 tristate "Virtual (secure) IPv6: tunneling"
 155         select IPV6_TUNNEL
 156         select NET_IP_TUNNEL
 157         select XFRM
 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
 165 config IPV6_SIT
 166         tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
 167         select INET_TUNNEL
 168         select NET_IP_TUNNEL
 169         select IPV6_NDISC_NODETYPE
 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
 175           into IPv4 packets. This is useful if you want to connect two IPv6
 176           networks over an IPv4-only path.
 177
 178           Saying M here will produce a module called sit. If unsure, say Y.
 179
 180 config IPV6_SIT_6RD
 181         bool "IPv6: IPv6 Rapid Deployment (6RD)"
 182         depends on IPV6_SIT
 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
 199 config IPV6_NDISC_NODETYPE
 200         bool
 201
 202 config IPV6_TUNNEL
 203         tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
 204         select INET6_TUNNEL
 205         select DST_CACHE
 206         select GRO_CELLS
 207         help
 208           Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
 209           RFC 2473.
 210
 211           If unsure, say N.
 212
 213 config IPV6_GRE
 214         tristate "IPv6: GRE tunnel"
 215         select IPV6_TUNNEL
 216         select NET_IP_TUNNEL
 217         depends on NET_IPGRE_DEMUX
 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
 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
 238         select IPV6_TUNNEL
 239
 240 config IPV6_MULTIPLE_TABLES
 241         bool "IPv6: Multiple Routing Tables"
 242         select FIB_RULES
 243         help
 244           Support multiple routing tables.
 245
 246 config IPV6_SUBTREES
 247         bool "IPv6: source address based routing"
 248         depends on IPV6_MULTIPLE_TABLES
 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
 260 config IPV6_MROUTE
 261         bool "IPv6: multicast routing"
 262         depends on IPV6
 263         select IP_MROUTE_COMMON
 264         help
 265           Support for IPv6 multicast forwarding.
 266           If unsure, say N.
 267
 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
 282 config IPV6_PIMSM_V2
 283         bool "IPv6: PIM-SM version 2 support"
 284         depends on IPV6_MROUTE
 285         help
 286           Support for IPv6 PIM multicast routing protocol PIM-SMv2.
 287           If unsure, say N.
 288
 289 config IPV6_SEG6_LWTUNNEL
 290         bool "IPv6: Segment Routing Header encapsulation support"
 291         depends on IPV6
 292         select LWTUNNEL
 293         select DST_CACHE
 294         select IPV6_MULTIPLE_TABLES
 295         help
 296           Support for encapsulation of packets within an outer IPv6
 297           header and a Segment Routing Header using the lightweight
 298           tunnels mechanism. Also enable support for advanced local
 299           processing of SRv6 packets based on their active segment.
 300
 301           If unsure, say N.
 302
 303 config IPV6_SEG6_HMAC
 304         bool "IPv6: Segment Routing HMAC support"
 305         depends on IPV6
 306         select CRYPTO
 307         select CRYPTO_HMAC
 308         select CRYPTO_SHA1
 309         select CRYPTO_SHA256
 310         help
 311           Support for HMAC signature generation and verification
 312           of SR-enabled packets.
 313
 314           If unsure, say N.
 315
 316 config IPV6_SEG6_BPF
 317         def_bool y
 318         depends on IPV6_SEG6_LWTUNNEL
 319         depends on IPV6 = y
 320
 321 config IPV6_RPL_LWTUNNEL
 322         bool "IPv6: RPL Source Routing Header support"
 323         depends on IPV6
 324         select LWTUNNEL
 325         help
 326           Support for RFC6554 RPL Source Routing Header using the lightweight
 327           tunnels mechanism.
 328
 329           If unsure, say N.
 330
 331 endif # IPV6