1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # IPv6 configuration 3 # IPv6 configuration
4 # 4 #
5 5
6 # IPv6 as module will cause a CRASH if you t 6 # IPv6 as module will cause a CRASH if you try to unload it
7 menuconfig IPV6 7 menuconfig IPV6
8 tristate "The IPv6 protocol" 8 tristate "The IPv6 protocol"
9 default y 9 default y
10 select CRYPTO_LIB_SHA1 <<
11 help 10 help
12 Support for IP version 6 (IPv6). 11 Support for IP version 6 (IPv6).
13 12
14 For general information about IPv6, 13 For general information about IPv6, see
15 <https://en.wikipedia.org/wiki/IPv6> 14 <https://en.wikipedia.org/wiki/IPv6>.
16 For specific information about IPv6 15 For specific information about IPv6 under Linux, see
17 Documentation/networking/ipv6.rst an 16 Documentation/networking/ipv6.rst and read the HOWTO at
18 <https://www.tldp.org/HOWTO/Linux+IP 17 <https://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
19 18
20 To compile this protocol support as 19 To compile this protocol support as a module, choose M here: the
21 module will be called ipv6. 20 module will be called ipv6.
22 21
23 if IPV6 22 if IPV6
24 23
25 config IPV6_ROUTER_PREF 24 config IPV6_ROUTER_PREF
26 bool "IPv6: Router Preference (RFC 419 25 bool "IPv6: Router Preference (RFC 4191) support"
27 help 26 help
28 Router Preference is an optional ext 27 Router Preference is an optional extension to the Router
29 Advertisement message which improves 28 Advertisement message which improves the ability of hosts
30 to pick an appropriate router, espec 29 to pick an appropriate router, especially when the hosts
31 are placed in a multi-homed network. 30 are placed in a multi-homed network.
32 31
33 If unsure, say N. 32 If unsure, say N.
34 33
35 config IPV6_ROUTE_INFO 34 config IPV6_ROUTE_INFO
36 bool "IPv6: Route Information (RFC 419 35 bool "IPv6: Route Information (RFC 4191) support"
37 depends on IPV6_ROUTER_PREF 36 depends on IPV6_ROUTER_PREF
38 help 37 help
39 Support of Route Information. 38 Support of Route Information.
40 39
41 If unsure, say N. 40 If unsure, say N.
42 41
43 config IPV6_OPTIMISTIC_DAD 42 config IPV6_OPTIMISTIC_DAD
44 bool "IPv6: Enable RFC 4429 Optimistic 43 bool "IPv6: Enable RFC 4429 Optimistic DAD"
45 help 44 help
46 Support for optimistic Duplicate Add 45 Support for optimistic Duplicate Address Detection. It allows for
47 autoconfigured addresses to be used 46 autoconfigured addresses to be used more quickly.
48 47
49 If unsure, say N. 48 If unsure, say N.
50 49
51 config INET6_AH 50 config INET6_AH
52 tristate "IPv6: AH transformation" 51 tristate "IPv6: AH transformation"
53 select XFRM_AH 52 select XFRM_AH
54 help 53 help
55 Support for IPsec AH (Authentication 54 Support for IPsec AH (Authentication Header).
56 55
57 AH can be used with various authenti 56 AH can be used with various authentication algorithms. Besides
58 enabling AH support itself, this opt 57 enabling AH support itself, this option enables the generic
59 implementations of the algorithms th 58 implementations of the algorithms that RFC 8221 lists as MUST be
60 implemented. If you need any other 59 implemented. If you need any other algorithms, you'll need to enable
61 them in the crypto API. You should 60 them in the crypto API. You should also enable accelerated
62 implementations of any needed algori 61 implementations of any needed algorithms when available.
63 62
64 If unsure, say Y. 63 If unsure, say Y.
65 64
66 config INET6_ESP 65 config INET6_ESP
67 tristate "IPv6: ESP transformation" 66 tristate "IPv6: ESP transformation"
68 select XFRM_ESP 67 select XFRM_ESP
69 help 68 help
70 Support for IPsec ESP (Encapsulating 69 Support for IPsec ESP (Encapsulating Security Payload).
71 70
72 ESP can be used with various encrypt 71 ESP can be used with various encryption and authentication algorithms.
73 Besides enabling ESP support itself, 72 Besides enabling ESP support itself, this option enables the generic
74 implementations of the algorithms th 73 implementations of the algorithms that RFC 8221 lists as MUST be
75 implemented. If you need any other 74 implemented. If you need any other algorithms, you'll need to enable
76 them in the crypto API. You should 75 them in the crypto API. You should also enable accelerated
77 implementations of any needed algori 76 implementations of any needed algorithms when available.
78 77
79 If unsure, say Y. 78 If unsure, say Y.
80 79
81 config INET6_ESP_OFFLOAD 80 config INET6_ESP_OFFLOAD
82 tristate "IPv6: ESP transformation off 81 tristate "IPv6: ESP transformation offload"
83 depends on INET6_ESP 82 depends on INET6_ESP
84 select XFRM_OFFLOAD 83 select XFRM_OFFLOAD
85 default n 84 default n
86 help 85 help
87 Support for ESP transformation offlo 86 Support for ESP transformation offload. This makes sense
88 only if this system really does IPse 87 only if this system really does IPsec and want to do it
89 with high throughput. A typical desk 88 with high throughput. A typical desktop system does not
90 need it, even if it does IPsec. 89 need it, even if it does IPsec.
91 90
92 If unsure, say N. 91 If unsure, say N.
93 92
94 config INET6_ESPINTCP 93 config INET6_ESPINTCP
95 bool "IPv6: ESP in TCP encapsulation ( 94 bool "IPv6: ESP in TCP encapsulation (RFC 8229)"
96 depends on XFRM && INET6_ESP 95 depends on XFRM && INET6_ESP
97 select STREAM_PARSER 96 select STREAM_PARSER
98 select NET_SOCK_MSG 97 select NET_SOCK_MSG
99 select XFRM_ESPINTCP 98 select XFRM_ESPINTCP
100 help 99 help
101 Support for RFC 8229 encapsulation o 100 Support for RFC 8229 encapsulation of ESP and IKE over
102 TCP/IPv6 sockets. 101 TCP/IPv6 sockets.
103 102
104 If unsure, say N. 103 If unsure, say N.
105 104
106 config INET6_IPCOMP 105 config INET6_IPCOMP
107 tristate "IPv6: IPComp transformation" 106 tristate "IPv6: IPComp transformation"
108 select INET6_XFRM_TUNNEL 107 select INET6_XFRM_TUNNEL
109 select XFRM_IPCOMP 108 select XFRM_IPCOMP
110 help 109 help
111 Support for IP Payload Compression P 110 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
112 typically needed for IPsec. 111 typically needed for IPsec.
113 112
114 If unsure, say Y. 113 If unsure, say Y.
115 114
116 config IPV6_MIP6 115 config IPV6_MIP6
117 tristate "IPv6: Mobility" 116 tristate "IPv6: Mobility"
118 select XFRM 117 select XFRM
119 help 118 help
120 Support for IPv6 Mobility described 119 Support for IPv6 Mobility described in RFC 3775.
121 120
122 If unsure, say N. 121 If unsure, say N.
123 122
124 config IPV6_ILA 123 config IPV6_ILA
125 tristate "IPv6: Identifier Locator Add 124 tristate "IPv6: Identifier Locator Addressing (ILA)"
126 depends on NETFILTER 125 depends on NETFILTER
127 select DST_CACHE 126 select DST_CACHE
128 select LWTUNNEL 127 select LWTUNNEL
129 help 128 help
130 Support for IPv6 Identifier Locator 129 Support for IPv6 Identifier Locator Addressing (ILA).
131 130
132 ILA is a mechanism to do network vir 131 ILA is a mechanism to do network virtualization without
133 encapsulation. The basic concept of 132 encapsulation. The basic concept of ILA is that we split an
134 IPv6 address into a 64 bit locator a 133 IPv6 address into a 64 bit locator and 64 bit identifier. The
135 identifier is the identity of an ent 134 identifier is the identity of an entity in communication
136 ("who") and the locator expresses th 135 ("who") and the locator expresses the location of the
137 entity ("where"). 136 entity ("where").
138 137
139 ILA can be configured using the "enc 138 ILA can be configured using the "encap ila" option with
140 "ip -6 route" command. ILA is descri 139 "ip -6 route" command. ILA is described in
141 https://tools.ietf.org/html/draft-he 140 https://tools.ietf.org/html/draft-herbert-nvo3-ila-00.
142 141
143 If unsure, say N. 142 If unsure, say N.
144 143
145 config INET6_XFRM_TUNNEL 144 config INET6_XFRM_TUNNEL
146 tristate 145 tristate
147 select INET6_TUNNEL 146 select INET6_TUNNEL
148 default n 147 default n
149 148
150 config INET6_TUNNEL 149 config INET6_TUNNEL
151 tristate 150 tristate
152 default n 151 default n
153 152
154 config IPV6_VTI 153 config IPV6_VTI
155 tristate "Virtual (secure) IPv6: tunne !! 154 tristate "Virtual (secure) IPv6: tunneling"
156 select IPV6_TUNNEL 155 select IPV6_TUNNEL
157 select NET_IP_TUNNEL 156 select NET_IP_TUNNEL
158 select XFRM 157 select XFRM
159 help 158 help
160 Tunneling means encapsulating data of 159 Tunneling means encapsulating data of one protocol type within
161 another protocol and sending it over a 160 another protocol and sending it over a channel that understands the
162 encapsulating protocol. This can be us 161 encapsulating protocol. This can be used with xfrm mode tunnel to give
163 the notion of a secure tunnel for IPSE 162 the notion of a secure tunnel for IPSEC and then use routing protocol
164 on top. 163 on top.
165 164
166 config IPV6_SIT 165 config IPV6_SIT
167 tristate "IPv6: IPv6-in-IPv4 tunnel (S 166 tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
168 select INET_TUNNEL 167 select INET_TUNNEL
169 select NET_IP_TUNNEL 168 select NET_IP_TUNNEL
170 select IPV6_NDISC_NODETYPE 169 select IPV6_NDISC_NODETYPE
171 default y 170 default y
172 help 171 help
173 Tunneling means encapsulating data o 172 Tunneling means encapsulating data of one protocol type within
174 another protocol and sending it over 173 another protocol and sending it over a channel that understands the
175 encapsulating protocol. This driver 174 encapsulating protocol. This driver implements encapsulation of IPv6
176 into IPv4 packets. This is useful if 175 into IPv4 packets. This is useful if you want to connect two IPv6
177 networks over an IPv4-only path. 176 networks over an IPv4-only path.
178 177
179 Saying M here will produce a module 178 Saying M here will produce a module called sit. If unsure, say Y.
180 179
181 config IPV6_SIT_6RD 180 config IPV6_SIT_6RD
182 bool "IPv6: IPv6 Rapid Deployment (6RD 181 bool "IPv6: IPv6 Rapid Deployment (6RD)"
183 depends on IPV6_SIT 182 depends on IPV6_SIT
184 default n 183 default n
185 help 184 help
186 IPv6 Rapid Deployment (6rd; draft-ie 185 IPv6 Rapid Deployment (6rd; draft-ietf-softwire-ipv6-6rd) builds upon
187 mechanisms of 6to4 (RFC3056) to enab 186 mechanisms of 6to4 (RFC3056) to enable a service provider to rapidly
188 deploy IPv6 unicast service to IPv4 187 deploy IPv6 unicast service to IPv4 sites to which it provides
189 customer premise equipment. Like 6t 188 customer premise equipment. Like 6to4, it utilizes stateless IPv6 in
190 IPv4 encapsulation in order to trans 189 IPv4 encapsulation in order to transit IPv4-only network
191 infrastructure. Unlike 6to4, a 6rd 190 infrastructure. Unlike 6to4, a 6rd service provider uses an IPv6
192 prefix of its own in place of the fi 191 prefix of its own in place of the fixed 6to4 prefix.
193 192
194 With this option enabled, the SIT dr 193 With this option enabled, the SIT driver offers 6rd functionality by
195 providing additional ioctl API to co 194 providing additional ioctl API to configure the IPv6 Prefix for in
196 stead of static 2002::/16 for 6to4. 195 stead of static 2002::/16 for 6to4.
197 196
198 If unsure, say N. 197 If unsure, say N.
199 198
200 config IPV6_NDISC_NODETYPE 199 config IPV6_NDISC_NODETYPE
201 bool 200 bool
202 201
203 config IPV6_TUNNEL 202 config IPV6_TUNNEL
204 tristate "IPv6: IP-in-IPv6 tunnel (RFC 203 tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
205 select INET6_TUNNEL 204 select INET6_TUNNEL
206 select DST_CACHE 205 select DST_CACHE
207 select GRO_CELLS 206 select GRO_CELLS
208 help 207 help
209 Support for IPv6-in-IPv6 and IPv4-in 208 Support for IPv6-in-IPv6 and IPv4-in-IPv6 tunnels described in
210 RFC 2473. 209 RFC 2473.
211 210
212 If unsure, say N. 211 If unsure, say N.
213 212
214 config IPV6_GRE 213 config IPV6_GRE
215 tristate "IPv6: GRE tunnel" 214 tristate "IPv6: GRE tunnel"
216 select IPV6_TUNNEL 215 select IPV6_TUNNEL
217 select NET_IP_TUNNEL 216 select NET_IP_TUNNEL
218 depends on NET_IPGRE_DEMUX 217 depends on NET_IPGRE_DEMUX
219 help 218 help
220 Tunneling means encapsulating data o 219 Tunneling means encapsulating data of one protocol type within
221 another protocol and sending it over 220 another protocol and sending it over a channel that understands the
222 encapsulating protocol. This particu 221 encapsulating protocol. This particular tunneling driver implements
223 GRE (Generic Routing Encapsulation) 222 GRE (Generic Routing Encapsulation) and at this time allows
224 encapsulating of IPv4 or IPv6 over e 223 encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
225 This driver is useful if the other e 224 This driver is useful if the other endpoint is a Cisco router: Cisco
226 likes GRE much better than the other 225 likes GRE much better than the other Linux tunneling driver ("IP
227 tunneling" above). In addition, GRE 226 tunneling" above). In addition, GRE allows multicast redistribution
228 through the tunnel. 227 through the tunnel.
229 228
230 Saying M here will produce a module 229 Saying M here will produce a module called ip6_gre. If unsure, say N.
231 230
232 config IPV6_FOU 231 config IPV6_FOU
233 tristate 232 tristate
234 default NET_FOU && IPV6 233 default NET_FOU && IPV6
235 234
236 config IPV6_FOU_TUNNEL 235 config IPV6_FOU_TUNNEL
237 tristate 236 tristate
238 default NET_FOU_IP_TUNNELS && IPV6_FOU 237 default NET_FOU_IP_TUNNELS && IPV6_FOU
239 select IPV6_TUNNEL 238 select IPV6_TUNNEL
240 239
241 config IPV6_MULTIPLE_TABLES 240 config IPV6_MULTIPLE_TABLES
242 bool "IPv6: Multiple Routing Tables" 241 bool "IPv6: Multiple Routing Tables"
243 select FIB_RULES 242 select FIB_RULES
244 help 243 help
245 Support multiple routing tables. 244 Support multiple routing tables.
246 245
247 config IPV6_SUBTREES 246 config IPV6_SUBTREES
248 bool "IPv6: source address based routi 247 bool "IPv6: source address based routing"
249 depends on IPV6_MULTIPLE_TABLES 248 depends on IPV6_MULTIPLE_TABLES
250 help 249 help
251 Enable routing by source address or 250 Enable routing by source address or prefix.
252 251
253 The destination address is still the 252 The destination address is still the primary routing key, so mixing
254 normal and source prefix specific ro 253 normal and source prefix specific routes in the same routing table
255 may sometimes lead to unintended rou 254 may sometimes lead to unintended routing behavior. This can be
256 avoided by defining different routin 255 avoided by defining different routing tables for the normal and
257 source prefix specific routes. 256 source prefix specific routes.
258 257
259 If unsure, say N. 258 If unsure, say N.
260 259
261 config IPV6_MROUTE 260 config IPV6_MROUTE
262 bool "IPv6: multicast routing" 261 bool "IPv6: multicast routing"
263 depends on IPV6 262 depends on IPV6
264 select IP_MROUTE_COMMON 263 select IP_MROUTE_COMMON
265 help 264 help
266 Support for IPv6 multicast forwardin 265 Support for IPv6 multicast forwarding.
267 If unsure, say N. 266 If unsure, say N.
268 267
269 config IPV6_MROUTE_MULTIPLE_TABLES 268 config IPV6_MROUTE_MULTIPLE_TABLES
270 bool "IPv6: multicast policy routing" 269 bool "IPv6: multicast policy routing"
271 depends on IPV6_MROUTE 270 depends on IPV6_MROUTE
272 select FIB_RULES 271 select FIB_RULES
273 help 272 help
274 Normally, a multicast router runs a 273 Normally, a multicast router runs a userspace daemon and decides
275 what to do with a multicast packet b 274 what to do with a multicast packet based on the source and
276 destination addresses. If you say Y 275 destination addresses. If you say Y here, the multicast router
277 will also be able to take interfaces 276 will also be able to take interfaces and packet marks into
278 account and run multiple instances o 277 account and run multiple instances of userspace daemons
279 simultaneously, each one handling a 278 simultaneously, each one handling a single table.
280 279
281 If unsure, say N. 280 If unsure, say N.
282 281
283 config IPV6_PIMSM_V2 282 config IPV6_PIMSM_V2
284 bool "IPv6: PIM-SM version 2 support" 283 bool "IPv6: PIM-SM version 2 support"
285 depends on IPV6_MROUTE 284 depends on IPV6_MROUTE
286 help 285 help
287 Support for IPv6 PIM multicast routi 286 Support for IPv6 PIM multicast routing protocol PIM-SMv2.
288 If unsure, say N. 287 If unsure, say N.
289 288
290 config IPV6_SEG6_LWTUNNEL 289 config IPV6_SEG6_LWTUNNEL
291 bool "IPv6: Segment Routing Header enc 290 bool "IPv6: Segment Routing Header encapsulation support"
292 depends on IPV6 291 depends on IPV6
293 select LWTUNNEL 292 select LWTUNNEL
294 select DST_CACHE 293 select DST_CACHE
295 select IPV6_MULTIPLE_TABLES 294 select IPV6_MULTIPLE_TABLES
296 help 295 help
297 Support for encapsulation of packets 296 Support for encapsulation of packets within an outer IPv6
298 header and a Segment Routing Header 297 header and a Segment Routing Header using the lightweight
299 tunnels mechanism. Also enable suppo 298 tunnels mechanism. Also enable support for advanced local
300 processing of SRv6 packets based on 299 processing of SRv6 packets based on their active segment.
301 300
302 If unsure, say N. 301 If unsure, say N.
303 302
304 config IPV6_SEG6_HMAC 303 config IPV6_SEG6_HMAC
305 bool "IPv6: Segment Routing HMAC suppo 304 bool "IPv6: Segment Routing HMAC support"
306 depends on IPV6 305 depends on IPV6
307 select CRYPTO 306 select CRYPTO
308 select CRYPTO_HMAC 307 select CRYPTO_HMAC
309 select CRYPTO_SHA1 308 select CRYPTO_SHA1
310 select CRYPTO_SHA256 309 select CRYPTO_SHA256
311 help 310 help
312 Support for HMAC signature generatio 311 Support for HMAC signature generation and verification
313 of SR-enabled packets. 312 of SR-enabled packets.
314 313
315 If unsure, say N. 314 If unsure, say N.
316 315
317 config IPV6_SEG6_BPF 316 config IPV6_SEG6_BPF
318 def_bool y 317 def_bool y
319 depends on IPV6_SEG6_LWTUNNEL 318 depends on IPV6_SEG6_LWTUNNEL
320 depends on IPV6 = y 319 depends on IPV6 = y
321 320
322 config IPV6_RPL_LWTUNNEL 321 config IPV6_RPL_LWTUNNEL
323 bool "IPv6: RPL Source Routing Header 322 bool "IPv6: RPL Source Routing Header support"
324 depends on IPV6 323 depends on IPV6
325 select LWTUNNEL 324 select LWTUNNEL
326 select DST_CACHE 325 select DST_CACHE
327 help 326 help
328 Support for RFC6554 RPL Source Routi 327 Support for RFC6554 RPL Source Routing Header using the lightweight
329 tunnels mechanism. 328 tunnels mechanism.
330 329
331 If unsure, say N. 330 If unsure, say N.
332 331
333 config IPV6_IOAM6_LWTUNNEL 332 config IPV6_IOAM6_LWTUNNEL
334 bool "IPv6: IOAM Pre-allocated Trace i 333 bool "IPv6: IOAM Pre-allocated Trace insertion support"
335 depends on IPV6 334 depends on IPV6
336 select LWTUNNEL 335 select LWTUNNEL
337 select DST_CACHE <<
338 help 336 help
339 Support for the insertion of IOAM Pr !! 337 Support for the inline insertion of IOAM Pre-allocated
340 Header using the lightweight tunnels !! 338 Trace Header (only on locally generated packets), using
>> 339 the lightweight tunnels mechanism.
341 340
342 If unsure, say N. 341 If unsure, say N.
343 342
344 endif # IPV6 343 endif # IPV6
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