1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # IP configuration 3 # IP configuration
4 # 4 #
5 config IP_MULTICAST 5 config IP_MULTICAST
6 bool "IP: multicasting" 6 bool "IP: multicasting"
7 help 7 help
8 This is code for addressing several 8 This is code for addressing several networked computers at once,
9 enlarging your kernel by about 2 KB. 9 enlarging your kernel by about 2 KB. You need multicasting if you
10 intend to participate in the MBONE, 10 intend to participate in the MBONE, a high bandwidth network on top
11 of the Internet which carries audio 11 of the Internet which carries audio and video broadcasts. More
12 information about the MBONE is on th 12 information about the MBONE is on the WWW at
13 <https://www.savetz.com/mbone/>. For 13 <https://www.savetz.com/mbone/>. For most people, it's safe to say N.
14 14
15 config IP_ADVANCED_ROUTER 15 config IP_ADVANCED_ROUTER
16 bool "IP: advanced router" 16 bool "IP: advanced router"
17 help 17 help
18 If you intend to run your Linux box 18 If you intend to run your Linux box mostly as a router, i.e. as a
19 computer that forwards and redistrib 19 computer that forwards and redistributes network packets, say Y; you
20 will then be presented with several 20 will then be presented with several options that allow more precise
21 control about the routing process. 21 control about the routing process.
22 22
23 The answer to this question won't di 23 The answer to this question won't directly affect the kernel:
24 answering N will just cause the conf 24 answering N will just cause the configurator to skip all the
25 questions about advanced routing. 25 questions about advanced routing.
26 26
27 Note that your box can only act as a 27 Note that your box can only act as a router if you enable IP
28 forwarding in your kernel; you can d 28 forwarding in your kernel; you can do that by saying Y to "/proc
29 file system support" and "Sysctl sup 29 file system support" and "Sysctl support" below and executing the
30 line 30 line
31 31
32 echo "1" > /proc/sys/net/ipv4/ip_for 32 echo "1" > /proc/sys/net/ipv4/ip_forward
33 33
34 at boot time after the /proc file sy 34 at boot time after the /proc file system has been mounted.
35 35
36 If you turn on IP forwarding, you sh 36 If you turn on IP forwarding, you should consider the rp_filter, which
37 automatically rejects incoming packe 37 automatically rejects incoming packets if the routing table entry
38 for their source address doesn't mat 38 for their source address doesn't match the network interface they're
39 arriving on. This has security advan 39 arriving on. This has security advantages because it prevents the
40 so-called IP spoofing, however it ca 40 so-called IP spoofing, however it can pose problems if you use
41 asymmetric routing (packets from you 41 asymmetric routing (packets from you to a host take a different path
42 than packets from that host to you) 42 than packets from that host to you) or if you operate a non-routing
43 host which has several IP addresses 43 host which has several IP addresses on different interfaces. To turn
44 rp_filter on use: 44 rp_filter on use:
45 45
46 echo 1 > /proc/sys/net/ipv4/conf/<de 46 echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
47 or 47 or
48 echo 1 > /proc/sys/net/ipv4/conf/all 48 echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
49 49
50 Note that some distributions enable 50 Note that some distributions enable it in startup scripts.
51 For details about rp_filter strict a 51 For details about rp_filter strict and loose mode read
52 <file:Documentation/networking/ip-sy 52 <file:Documentation/networking/ip-sysctl.rst>.
53 53
54 If unsure, say N here. 54 If unsure, say N here.
55 55
56 config IP_FIB_TRIE_STATS 56 config IP_FIB_TRIE_STATS
57 bool "FIB TRIE statistics" 57 bool "FIB TRIE statistics"
58 depends on IP_ADVANCED_ROUTER 58 depends on IP_ADVANCED_ROUTER
59 help 59 help
60 Keep track of statistics on structur 60 Keep track of statistics on structure of FIB TRIE table.
61 Useful for testing and measuring TRI 61 Useful for testing and measuring TRIE performance.
62 62
63 config IP_MULTIPLE_TABLES 63 config IP_MULTIPLE_TABLES
64 bool "IP: policy routing" 64 bool "IP: policy routing"
65 depends on IP_ADVANCED_ROUTER 65 depends on IP_ADVANCED_ROUTER
66 select FIB_RULES 66 select FIB_RULES
67 help 67 help
68 Normally, a router decides what to d 68 Normally, a router decides what to do with a received packet based
69 solely on the packet's final destina 69 solely on the packet's final destination address. If you say Y here,
70 the Linux router will also be able t 70 the Linux router will also be able to take the packet's source
71 address into account. Furthermore, t 71 address into account. Furthermore, the TOS (Type-Of-Service) field
72 of the packet can be used for routin 72 of the packet can be used for routing decisions as well.
73 73
74 If you need more information, see th 74 If you need more information, see the Linux Advanced
75 Routing and Traffic Control document 75 Routing and Traffic Control documentation at
76 <https://lartc.org/howto/lartc.rpdb. 76 <https://lartc.org/howto/lartc.rpdb.html>
77 77
78 If unsure, say N. 78 If unsure, say N.
79 79
80 config IP_ROUTE_MULTIPATH 80 config IP_ROUTE_MULTIPATH
81 bool "IP: equal cost multipath" 81 bool "IP: equal cost multipath"
82 depends on IP_ADVANCED_ROUTER 82 depends on IP_ADVANCED_ROUTER
83 help 83 help
84 Normally, the routing tables specify 84 Normally, the routing tables specify a single action to be taken in
85 a deterministic manner for a given p 85 a deterministic manner for a given packet. If you say Y here
86 however, it becomes possible to atta 86 however, it becomes possible to attach several actions to a packet
87 pattern, in effect specifying severa 87 pattern, in effect specifying several alternative paths to travel
88 for those packets. The router consid 88 for those packets. The router considers all these paths to be of
89 equal "cost" and chooses one of them 89 equal "cost" and chooses one of them in a non-deterministic fashion
90 if a matching packet arrives. 90 if a matching packet arrives.
91 91
92 config IP_ROUTE_VERBOSE 92 config IP_ROUTE_VERBOSE
93 bool "IP: verbose route monitoring" 93 bool "IP: verbose route monitoring"
94 depends on IP_ADVANCED_ROUTER 94 depends on IP_ADVANCED_ROUTER
95 help 95 help
96 If you say Y here, which is recommen 96 If you say Y here, which is recommended, then the kernel will print
97 verbose messages regarding the routi 97 verbose messages regarding the routing, for example warnings about
98 received packets which look strange 98 received packets which look strange and could be evidence of an
99 attack or a misconfigured system som 99 attack or a misconfigured system somewhere. The information is
100 handled by the klogd daemon which is 100 handled by the klogd daemon which is responsible for kernel messages
101 ("man klogd"). 101 ("man klogd").
102 102
103 config IP_ROUTE_CLASSID 103 config IP_ROUTE_CLASSID
104 bool 104 bool
105 105
106 config IP_PNP 106 config IP_PNP
107 bool "IP: kernel level autoconfigurati 107 bool "IP: kernel level autoconfiguration"
108 help 108 help
109 This enables automatic configuration 109 This enables automatic configuration of IP addresses of devices and
110 of the routing table during kernel b 110 of the routing table during kernel boot, based on either information
111 supplied on the kernel command line 111 supplied on the kernel command line or by BOOTP or RARP protocols.
112 You need to say Y only for diskless 112 You need to say Y only for diskless machines requiring network
113 access to boot (in which case you wa 113 access to boot (in which case you want to say Y to "Root file system
114 on NFS" as well), because all other 114 on NFS" as well), because all other machines configure the network
115 in their startup scripts. 115 in their startup scripts.
116 116
117 config IP_PNP_DHCP 117 config IP_PNP_DHCP
118 bool "IP: DHCP support" 118 bool "IP: DHCP support"
119 depends on IP_PNP 119 depends on IP_PNP
120 help 120 help
121 If you want your Linux box to mount 121 If you want your Linux box to mount its whole root file system (the
122 one containing the directory /) from 122 one containing the directory /) from some other computer over the
123 net via NFS and you want the IP addr 123 net via NFS and you want the IP address of your computer to be
124 discovered automatically at boot tim 124 discovered automatically at boot time using the DHCP protocol (a
125 special protocol designed for doing 125 special protocol designed for doing this job), say Y here. In case
126 the boot ROM of your network card wa 126 the boot ROM of your network card was designed for booting Linux and
127 does DHCP itself, providing all nece 127 does DHCP itself, providing all necessary information on the kernel
128 command line, you can say N here. 128 command line, you can say N here.
129 129
130 If unsure, say Y. Note that if you w 130 If unsure, say Y. Note that if you want to use DHCP, a DHCP server
131 must be operating on your network. 131 must be operating on your network. Read
132 <file:Documentation/admin-guide/nfs/ 132 <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
133 133
134 config IP_PNP_BOOTP 134 config IP_PNP_BOOTP
135 bool "IP: BOOTP support" 135 bool "IP: BOOTP support"
136 depends on IP_PNP 136 depends on IP_PNP
137 help 137 help
138 If you want your Linux box to mount 138 If you want your Linux box to mount its whole root file system (the
139 one containing the directory /) from 139 one containing the directory /) from some other computer over the
140 net via NFS and you want the IP addr 140 net via NFS and you want the IP address of your computer to be
141 discovered automatically at boot tim 141 discovered automatically at boot time using the BOOTP protocol (a
142 special protocol designed for doing 142 special protocol designed for doing this job), say Y here. In case
143 the boot ROM of your network card wa 143 the boot ROM of your network card was designed for booting Linux and
144 does BOOTP itself, providing all nec 144 does BOOTP itself, providing all necessary information on the kernel
145 command line, you can say N here. If 145 command line, you can say N here. If unsure, say Y. Note that if you
146 want to use BOOTP, a BOOTP server mu 146 want to use BOOTP, a BOOTP server must be operating on your network.
147 Read <file:Documentation/admin-guide 147 Read <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
148 148
149 config IP_PNP_RARP 149 config IP_PNP_RARP
150 bool "IP: RARP support" 150 bool "IP: RARP support"
151 depends on IP_PNP 151 depends on IP_PNP
152 help 152 help
153 If you want your Linux box to mount 153 If you want your Linux box to mount its whole root file system (the
154 one containing the directory /) from 154 one containing the directory /) from some other computer over the
155 net via NFS and you want the IP addr 155 net via NFS and you want the IP address of your computer to be
156 discovered automatically at boot tim 156 discovered automatically at boot time using the RARP protocol (an
157 older protocol which is being obsole 157 older protocol which is being obsoleted by BOOTP and DHCP), say Y
158 here. Note that if you want to use R 158 here. Note that if you want to use RARP, a RARP server must be
159 operating on your network. Read 159 operating on your network. Read
160 <file:Documentation/admin-guide/nfs/ 160 <file:Documentation/admin-guide/nfs/nfsroot.rst> for details.
161 161
162 config NET_IPIP 162 config NET_IPIP
163 tristate "IP: tunneling" 163 tristate "IP: tunneling"
164 select INET_TUNNEL 164 select INET_TUNNEL
165 select NET_IP_TUNNEL 165 select NET_IP_TUNNEL
166 help 166 help
167 Tunneling means encapsulating data o 167 Tunneling means encapsulating data of one protocol type within
168 another protocol and sending it over 168 another protocol and sending it over a channel that understands the
169 encapsulating protocol. This particu 169 encapsulating protocol. This particular tunneling driver implements
170 encapsulation of IP within IP, which 170 encapsulation of IP within IP, which sounds kind of pointless, but
171 can be useful if you want to make yo 171 can be useful if you want to make your (or some other) machine
172 appear on a different network than i 172 appear on a different network than it physically is, or to use
173 mobile-IP facilities (allowing lapto 173 mobile-IP facilities (allowing laptops to seamlessly move between
174 networks without changing their IP a 174 networks without changing their IP addresses).
175 175
176 Saying Y to this option will produce 176 Saying Y to this option will produce two modules ( = code which can
177 be inserted in and removed from the 177 be inserted in and removed from the running kernel whenever you
178 want). Most people won't need this a 178 want). Most people won't need this and can say N.
179 179
180 config NET_IPGRE_DEMUX 180 config NET_IPGRE_DEMUX
181 tristate "IP: GRE demultiplexer" 181 tristate "IP: GRE demultiplexer"
182 help 182 help
183 This is helper module to demultiplex 183 This is helper module to demultiplex GRE packets on GRE version field criteria.
184 Required by ip_gre and pptp modules. 184 Required by ip_gre and pptp modules.
185 185
186 config NET_IP_TUNNEL 186 config NET_IP_TUNNEL
187 tristate 187 tristate
188 select DST_CACHE 188 select DST_CACHE
189 select GRO_CELLS 189 select GRO_CELLS
190 default n 190 default n
191 191
192 config NET_IPGRE 192 config NET_IPGRE
193 tristate "IP: GRE tunnels over IP" 193 tristate "IP: GRE tunnels over IP"
194 depends on (IPV6 || IPV6=n) && NET_IPG 194 depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX
195 select NET_IP_TUNNEL 195 select NET_IP_TUNNEL
196 help 196 help
197 Tunneling means encapsulating data o 197 Tunneling means encapsulating data of one protocol type within
198 another protocol and sending it over 198 another protocol and sending it over a channel that understands the
199 encapsulating protocol. This particu 199 encapsulating protocol. This particular tunneling driver implements
200 GRE (Generic Routing Encapsulation) 200 GRE (Generic Routing Encapsulation) and at this time allows
201 encapsulating of IPv4 or IPv6 over e 201 encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure.
202 This driver is useful if the other e 202 This driver is useful if the other endpoint is a Cisco router: Cisco
203 likes GRE much better than the other 203 likes GRE much better than the other Linux tunneling driver ("IP
204 tunneling" above). In addition, GRE 204 tunneling" above). In addition, GRE allows multicast redistribution
205 through the tunnel. 205 through the tunnel.
206 206
207 config NET_IPGRE_BROADCAST 207 config NET_IPGRE_BROADCAST
208 bool "IP: broadcast GRE over IP" 208 bool "IP: broadcast GRE over IP"
209 depends on IP_MULTICAST && NET_IPGRE 209 depends on IP_MULTICAST && NET_IPGRE
210 help 210 help
211 One application of GRE/IP is to cons 211 One application of GRE/IP is to construct a broadcast WAN (Wide Area
212 Network), which looks like a normal 212 Network), which looks like a normal Ethernet LAN (Local Area
213 Network), but can be distributed all 213 Network), but can be distributed all over the Internet. If you want
214 to do that, say Y here and to "IP mu 214 to do that, say Y here and to "IP multicast routing" below.
215 215
216 config IP_MROUTE_COMMON 216 config IP_MROUTE_COMMON
217 bool 217 bool
218 depends on IP_MROUTE || IPV6_MROUTE 218 depends on IP_MROUTE || IPV6_MROUTE
219 219
220 config IP_MROUTE 220 config IP_MROUTE
221 bool "IP: multicast routing" 221 bool "IP: multicast routing"
222 depends on IP_MULTICAST 222 depends on IP_MULTICAST
223 select IP_MROUTE_COMMON 223 select IP_MROUTE_COMMON
224 help 224 help
225 This is used if you want your machin 225 This is used if you want your machine to act as a router for IP
226 packets that have several destinatio 226 packets that have several destination addresses. It is needed on the
227 MBONE, a high bandwidth network on t 227 MBONE, a high bandwidth network on top of the Internet which carries
228 audio and video broadcasts. In order 228 audio and video broadcasts. In order to do that, you would most
229 likely run the program mrouted. If y 229 likely run the program mrouted. If you haven't heard about it, you
230 don't need it. 230 don't need it.
231 231
232 config IP_MROUTE_MULTIPLE_TABLES 232 config IP_MROUTE_MULTIPLE_TABLES
233 bool "IP: multicast policy routing" 233 bool "IP: multicast policy routing"
234 depends on IP_MROUTE && IP_ADVANCED_RO 234 depends on IP_MROUTE && IP_ADVANCED_ROUTER
235 select FIB_RULES 235 select FIB_RULES
236 help 236 help
237 Normally, a multicast router runs a 237 Normally, a multicast router runs a userspace daemon and decides
238 what to do with a multicast packet b 238 what to do with a multicast packet based on the source and
239 destination addresses. If you say Y 239 destination addresses. If you say Y here, the multicast router
240 will also be able to take interfaces 240 will also be able to take interfaces and packet marks into
241 account and run multiple instances o 241 account and run multiple instances of userspace daemons
242 simultaneously, each one handling a 242 simultaneously, each one handling a single table.
243 243
244 If unsure, say N. 244 If unsure, say N.
245 245
246 config IP_PIMSM_V1 246 config IP_PIMSM_V1
247 bool "IP: PIM-SM version 1 support" 247 bool "IP: PIM-SM version 1 support"
248 depends on IP_MROUTE 248 depends on IP_MROUTE
249 help 249 help
250 Kernel side support for Sparse Mode 250 Kernel side support for Sparse Mode PIM (Protocol Independent
251 Multicast) version 1. This multicast 251 Multicast) version 1. This multicast routing protocol is used widely
252 because Cisco supports it. You need 252 because Cisco supports it. You need special software to use it
253 (pimd-v1). Please see <http://netweb 253 (pimd-v1). Please see <http://netweb.usc.edu/pim/> for more
254 information about PIM. 254 information about PIM.
255 255
256 Say Y if you want to use PIM-SM v1. 256 Say Y if you want to use PIM-SM v1. Note that you can say N here if
257 you just want to use Dense Mode PIM. 257 you just want to use Dense Mode PIM.
258 258
259 config IP_PIMSM_V2 259 config IP_PIMSM_V2
260 bool "IP: PIM-SM version 2 support" 260 bool "IP: PIM-SM version 2 support"
261 depends on IP_MROUTE 261 depends on IP_MROUTE
262 help 262 help
263 Kernel side support for Sparse Mode 263 Kernel side support for Sparse Mode PIM version 2. In order to use
264 this, you need an experimental routi 264 this, you need an experimental routing daemon supporting it (pimd or
265 gated-5). This routing protocol is n 265 gated-5). This routing protocol is not used widely, so say N unless
266 you want to play with it. 266 you want to play with it.
267 267
268 config SYN_COOKIES 268 config SYN_COOKIES
269 bool "IP: TCP syncookie support" 269 bool "IP: TCP syncookie support"
270 help 270 help
271 Normal TCP/IP networking is open to 271 Normal TCP/IP networking is open to an attack known as "SYN
272 flooding". This denial-of-service at 272 flooding". This denial-of-service attack prevents legitimate remote
273 users from being able to connect to 273 users from being able to connect to your computer during an ongoing
274 attack and requires very little work 274 attack and requires very little work from the attacker, who can
275 operate from anywhere on the Interne 275 operate from anywhere on the Internet.
276 276
277 SYN cookies provide protection again 277 SYN cookies provide protection against this type of attack. If you
278 say Y here, the TCP/IP stack will us 278 say Y here, the TCP/IP stack will use a cryptographic challenge
279 protocol known as "SYN cookies" to e 279 protocol known as "SYN cookies" to enable legitimate users to
280 continue to connect, even when your 280 continue to connect, even when your machine is under attack. There
281 is no need for the legitimate users 281 is no need for the legitimate users to change their TCP/IP software;
282 SYN cookies work transparently to th 282 SYN cookies work transparently to them. For technical information
283 about SYN cookies, check out <https: 283 about SYN cookies, check out <https://cr.yp.to/syncookies.html>.
284 284
285 If you are SYN flooded, the source a 285 If you are SYN flooded, the source address reported by the kernel is
286 likely to have been forged by the at 286 likely to have been forged by the attacker; it is only reported as
287 an aid in tracing the packets to the 287 an aid in tracing the packets to their actual source and should not
288 be taken as absolute truth. 288 be taken as absolute truth.
289 289
290 SYN cookies may prevent correct erro 290 SYN cookies may prevent correct error reporting on clients when the
291 server is really overloaded. If this 291 server is really overloaded. If this happens frequently better turn
292 them off. 292 them off.
293 293
294 If you say Y here, you can disable S 294 If you say Y here, you can disable SYN cookies at run time by
295 saying Y to "/proc file system suppo 295 saying Y to "/proc file system support" and
296 "Sysctl support" below and executing 296 "Sysctl support" below and executing the command
297 297
298 echo 0 > /proc/sys/net/ipv4/tcp_sync 298 echo 0 > /proc/sys/net/ipv4/tcp_syncookies
299 299
300 after the /proc file system has been 300 after the /proc file system has been mounted.
301 301
302 If unsure, say N. 302 If unsure, say N.
303 303
304 config NET_IPVTI 304 config NET_IPVTI
305 tristate "Virtual (secure) IP: tunneli 305 tristate "Virtual (secure) IP: tunneling"
306 depends on IPV6 || IPV6=n 306 depends on IPV6 || IPV6=n
307 select INET_TUNNEL 307 select INET_TUNNEL
308 select NET_IP_TUNNEL 308 select NET_IP_TUNNEL
309 select XFRM 309 select XFRM
310 help 310 help
311 Tunneling means encapsulating data o 311 Tunneling means encapsulating data of one protocol type within
312 another protocol and sending it over 312 another protocol and sending it over a channel that understands the
313 encapsulating protocol. This can be 313 encapsulating protocol. This can be used with xfrm mode tunnel to give
314 the notion of a secure tunnel for IP 314 the notion of a secure tunnel for IPSEC and then use routing protocol
315 on top. 315 on top.
316 316
317 config NET_UDP_TUNNEL 317 config NET_UDP_TUNNEL
318 tristate 318 tristate
319 select NET_IP_TUNNEL 319 select NET_IP_TUNNEL
320 default n 320 default n
321 321
322 config NET_FOU 322 config NET_FOU
323 tristate "IP: Foo (IP protocols) over 323 tristate "IP: Foo (IP protocols) over UDP"
>> 324 select XFRM
324 select NET_UDP_TUNNEL 325 select NET_UDP_TUNNEL
325 help 326 help
326 Foo over UDP allows any IP protocol 327 Foo over UDP allows any IP protocol to be directly encapsulated
327 over UDP include tunnels (IPIP, GRE, 328 over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP
328 network mechanisms and optimizations 329 network mechanisms and optimizations for UDP (such as ECMP
329 and RSS) can be leveraged to provide 330 and RSS) can be leveraged to provide better service.
330 331
331 config NET_FOU_IP_TUNNELS 332 config NET_FOU_IP_TUNNELS
332 bool "IP: FOU encapsulation of IP tunn 333 bool "IP: FOU encapsulation of IP tunnels"
333 depends on NET_IPIP || NET_IPGRE || IP 334 depends on NET_IPIP || NET_IPGRE || IPV6_SIT
334 select NET_FOU 335 select NET_FOU
335 help 336 help
336 Allow configuration of FOU or GUE en 337 Allow configuration of FOU or GUE encapsulation for IP tunnels.
337 When this option is enabled IP tunne 338 When this option is enabled IP tunnels can be configured to use
338 FOU or GUE encapsulation. 339 FOU or GUE encapsulation.
339 340
340 config INET_AH 341 config INET_AH
341 tristate "IP: AH transformation" 342 tristate "IP: AH transformation"
342 select XFRM_AH 343 select XFRM_AH
343 help 344 help
344 Support for IPsec AH (Authentication 345 Support for IPsec AH (Authentication Header).
345 346
346 AH can be used with various authenti 347 AH can be used with various authentication algorithms. Besides
347 enabling AH support itself, this opt 348 enabling AH support itself, this option enables the generic
348 implementations of the algorithms th 349 implementations of the algorithms that RFC 8221 lists as MUST be
349 implemented. If you need any other 350 implemented. If you need any other algorithms, you'll need to enable
350 them in the crypto API. You should 351 them in the crypto API. You should also enable accelerated
351 implementations of any needed algori 352 implementations of any needed algorithms when available.
352 353
353 If unsure, say Y. 354 If unsure, say Y.
354 355
355 config INET_ESP 356 config INET_ESP
356 tristate "IP: ESP transformation" 357 tristate "IP: ESP transformation"
357 select XFRM_ESP 358 select XFRM_ESP
358 help 359 help
359 Support for IPsec ESP (Encapsulating 360 Support for IPsec ESP (Encapsulating Security Payload).
360 361
361 ESP can be used with various encrypt 362 ESP can be used with various encryption and authentication algorithms.
362 Besides enabling ESP support itself, 363 Besides enabling ESP support itself, this option enables the generic
363 implementations of the algorithms th 364 implementations of the algorithms that RFC 8221 lists as MUST be
364 implemented. If you need any other 365 implemented. If you need any other algorithms, you'll need to enable
365 them in the crypto API. You should 366 them in the crypto API. You should also enable accelerated
366 implementations of any needed algori 367 implementations of any needed algorithms when available.
367 368
368 If unsure, say Y. 369 If unsure, say Y.
369 370
370 config INET_ESP_OFFLOAD 371 config INET_ESP_OFFLOAD
371 tristate "IP: ESP transformation offlo 372 tristate "IP: ESP transformation offload"
372 depends on INET_ESP 373 depends on INET_ESP
373 select XFRM_OFFLOAD 374 select XFRM_OFFLOAD
374 default n 375 default n
375 help 376 help
376 Support for ESP transformation offlo 377 Support for ESP transformation offload. This makes sense
377 only if this system really does IPse 378 only if this system really does IPsec and want to do it
378 with high throughput. A typical desk 379 with high throughput. A typical desktop system does not
379 need it, even if it does IPsec. 380 need it, even if it does IPsec.
380 381
381 If unsure, say N. 382 If unsure, say N.
382 383
383 config INET_ESPINTCP 384 config INET_ESPINTCP
384 bool "IP: ESP in TCP encapsulation (RF 385 bool "IP: ESP in TCP encapsulation (RFC 8229)"
385 depends on XFRM && INET_ESP 386 depends on XFRM && INET_ESP
386 select STREAM_PARSER 387 select STREAM_PARSER
387 select NET_SOCK_MSG 388 select NET_SOCK_MSG
388 select XFRM_ESPINTCP 389 select XFRM_ESPINTCP
389 help 390 help
390 Support for RFC 8229 encapsulation o 391 Support for RFC 8229 encapsulation of ESP and IKE over
391 TCP/IPv4 sockets. 392 TCP/IPv4 sockets.
392 393
393 If unsure, say N. 394 If unsure, say N.
394 395
395 config INET_IPCOMP 396 config INET_IPCOMP
396 tristate "IP: IPComp transformation" 397 tristate "IP: IPComp transformation"
397 select INET_XFRM_TUNNEL 398 select INET_XFRM_TUNNEL
398 select XFRM_IPCOMP 399 select XFRM_IPCOMP
399 help 400 help
400 Support for IP Payload Compression P 401 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
401 typically needed for IPsec. 402 typically needed for IPsec.
402 403
403 If unsure, say Y. 404 If unsure, say Y.
404 405
405 config INET_TABLE_PERTURB_ORDER <<
406 int "INET: Source port perturbation ta <<
407 default 16 <<
408 help <<
409 Source port perturbation table size <<
410 RFC 6056 3.3.4. Algorithm 4: Double <<
411 <<
412 The default is almost always what yo <<
413 Only change this if you know what yo <<
414 <<
415 config INET_XFRM_TUNNEL 406 config INET_XFRM_TUNNEL
416 tristate 407 tristate
417 select INET_TUNNEL 408 select INET_TUNNEL
418 default n 409 default n
419 410
420 config INET_TUNNEL 411 config INET_TUNNEL
421 tristate 412 tristate
422 default n 413 default n
423 414
424 config INET_DIAG 415 config INET_DIAG
425 tristate "INET: socket monitoring inte 416 tristate "INET: socket monitoring interface"
426 default y 417 default y
427 help 418 help
428 Support for INET (TCP, DCCP, etc) so 419 Support for INET (TCP, DCCP, etc) socket monitoring interface used by
429 native Linux tools such as ss. ss is 420 native Linux tools such as ss. ss is included in iproute2, currently
430 downloadable at: 421 downloadable at:
431 422
432 http://www.linuxfoundation.org/col 423 http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2
433 424
434 If unsure, say Y. 425 If unsure, say Y.
435 426
436 config INET_TCP_DIAG 427 config INET_TCP_DIAG
437 depends on INET_DIAG 428 depends on INET_DIAG
438 def_tristate INET_DIAG 429 def_tristate INET_DIAG
439 430
440 config INET_UDP_DIAG 431 config INET_UDP_DIAG
441 tristate "UDP: socket monitoring inter 432 tristate "UDP: socket monitoring interface"
442 depends on INET_DIAG && (IPV6 || IPV6= 433 depends on INET_DIAG && (IPV6 || IPV6=n)
443 default n 434 default n
444 help 435 help
445 Support for UDP socket monitoring in 436 Support for UDP socket monitoring interface used by the ss tool.
446 If unsure, say Y. 437 If unsure, say Y.
447 438
448 config INET_RAW_DIAG 439 config INET_RAW_DIAG
449 tristate "RAW: socket monitoring inter 440 tristate "RAW: socket monitoring interface"
450 depends on INET_DIAG && (IPV6 || IPV6= 441 depends on INET_DIAG && (IPV6 || IPV6=n)
451 default n 442 default n
452 help 443 help
453 Support for RAW socket monitoring in 444 Support for RAW socket monitoring interface used by the ss tool.
454 If unsure, say Y. 445 If unsure, say Y.
455 446
456 config INET_DIAG_DESTROY 447 config INET_DIAG_DESTROY
457 bool "INET: allow privileged process t 448 bool "INET: allow privileged process to administratively close sockets"
458 depends on INET_DIAG 449 depends on INET_DIAG
459 default n 450 default n
460 help 451 help
461 Provides a SOCK_DESTROY operation th 452 Provides a SOCK_DESTROY operation that allows privileged processes
462 (e.g., a connection manager or a net 453 (e.g., a connection manager or a network administration tool such as
463 ss) to close sockets opened by other 454 ss) to close sockets opened by other processes. Closing a socket in
464 this way interrupts any blocking rea 455 this way interrupts any blocking read/write/connect operations on
465 the socket and causes future socket 456 the socket and causes future socket calls to behave as if the socket
466 had been disconnected. 457 had been disconnected.
467 If unsure, say N. 458 If unsure, say N.
468 459
469 menuconfig TCP_CONG_ADVANCED 460 menuconfig TCP_CONG_ADVANCED
470 bool "TCP: advanced congestion control 461 bool "TCP: advanced congestion control"
471 help 462 help
472 Support for selection of various TCP 463 Support for selection of various TCP congestion control
473 modules. 464 modules.
474 465
475 Nearly all users can safely say no h 466 Nearly all users can safely say no here, and a safe default
476 selection will be made (CUBIC with n 467 selection will be made (CUBIC with new Reno as a fallback).
477 468
478 If unsure, say N. 469 If unsure, say N.
479 470
480 if TCP_CONG_ADVANCED 471 if TCP_CONG_ADVANCED
481 472
482 config TCP_CONG_BIC 473 config TCP_CONG_BIC
483 tristate "Binary Increase Congestion ( 474 tristate "Binary Increase Congestion (BIC) control"
484 default m 475 default m
485 help 476 help
486 BIC-TCP is a sender-side only change 477 BIC-TCP is a sender-side only change that ensures a linear RTT
487 fairness under large windows while o 478 fairness under large windows while offering both scalability and
488 bounded TCP-friendliness. The protoc 479 bounded TCP-friendliness. The protocol combines two schemes
489 called additive increase and binary 480 called additive increase and binary search increase. When the
490 congestion window is large, additive 481 congestion window is large, additive increase with a large
491 increment ensures linear RTT fairnes 482 increment ensures linear RTT fairness as well as good
492 scalability. Under small congestion 483 scalability. Under small congestion windows, binary search
493 increase provides TCP friendliness. 484 increase provides TCP friendliness.
494 See http://www.csc.ncsu.edu/faculty/ 485 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
495 486
496 config TCP_CONG_CUBIC 487 config TCP_CONG_CUBIC
497 tristate "CUBIC TCP" 488 tristate "CUBIC TCP"
498 default y 489 default y
499 help 490 help
500 This is version 2.0 of BIC-TCP which 491 This is version 2.0 of BIC-TCP which uses a cubic growth function
501 among other techniques. 492 among other techniques.
502 See http://www.csc.ncsu.edu/faculty/ 493 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
503 494
504 config TCP_CONG_WESTWOOD 495 config TCP_CONG_WESTWOOD
505 tristate "TCP Westwood+" 496 tristate "TCP Westwood+"
506 default m 497 default m
507 help 498 help
508 TCP Westwood+ is a sender-side only 499 TCP Westwood+ is a sender-side only modification of the TCP Reno
509 protocol stack that optimizes the pe 500 protocol stack that optimizes the performance of TCP congestion
510 control. It is based on end-to-end b 501 control. It is based on end-to-end bandwidth estimation to set
511 congestion window and slow start thr 502 congestion window and slow start threshold after a congestion
512 episode. Using this estimation, TCP 503 episode. Using this estimation, TCP Westwood+ adaptively sets a
513 slow start threshold and a congestio 504 slow start threshold and a congestion window which takes into
514 account the bandwidth used at the t 505 account the bandwidth used at the time congestion is experienced.
515 TCP Westwood+ significantly increase 506 TCP Westwood+ significantly increases fairness wrt TCP Reno in
516 wired networks and throughput over w 507 wired networks and throughput over wireless links.
517 508
518 config TCP_CONG_HTCP 509 config TCP_CONG_HTCP
519 tristate "H-TCP" 510 tristate "H-TCP"
520 default m 511 default m
521 help 512 help
522 H-TCP is a send-side only modificati 513 H-TCP is a send-side only modifications of the TCP Reno
523 protocol stack that optimizes the pe 514 protocol stack that optimizes the performance of TCP
524 congestion control for high speed ne 515 congestion control for high speed network links. It uses a
525 modeswitch to change the alpha and b 516 modeswitch to change the alpha and beta parameters of TCP Reno
526 based on network conditions and in a 517 based on network conditions and in a way so as to be fair with
527 other Reno and H-TCP flows. 518 other Reno and H-TCP flows.
528 519
529 config TCP_CONG_HSTCP 520 config TCP_CONG_HSTCP
530 tristate "High Speed TCP" 521 tristate "High Speed TCP"
531 default n 522 default n
532 help 523 help
533 Sally Floyd's High Speed TCP (RFC 36 524 Sally Floyd's High Speed TCP (RFC 3649) congestion control.
534 A modification to TCP's congestion c 525 A modification to TCP's congestion control mechanism for use
535 with large congestion windows. A tab 526 with large congestion windows. A table indicates how much to
536 increase the congestion window by wh 527 increase the congestion window by when an ACK is received.
537 For more detail see https://www.icir 528 For more detail see https://www.icir.org/floyd/hstcp.html
538 529
539 config TCP_CONG_HYBLA 530 config TCP_CONG_HYBLA
540 tristate "TCP-Hybla congestion control 531 tristate "TCP-Hybla congestion control algorithm"
541 default n 532 default n
542 help 533 help
543 TCP-Hybla is a sender-side only chan 534 TCP-Hybla is a sender-side only change that eliminates penalization of
544 long-RTT, large-bandwidth connection 535 long-RTT, large-bandwidth connections, like when satellite legs are
545 involved, especially when sharing a 536 involved, especially when sharing a common bottleneck with normal
546 terrestrial connections. 537 terrestrial connections.
547 538
548 config TCP_CONG_VEGAS 539 config TCP_CONG_VEGAS
549 tristate "TCP Vegas" 540 tristate "TCP Vegas"
550 default n 541 default n
551 help 542 help
552 TCP Vegas is a sender-side only chan 543 TCP Vegas is a sender-side only change to TCP that anticipates
553 the onset of congestion by estimatin 544 the onset of congestion by estimating the bandwidth. TCP Vegas
554 adjusts the sending rate by modifyin 545 adjusts the sending rate by modifying the congestion
555 window. TCP Vegas should provide les 546 window. TCP Vegas should provide less packet loss, but it is
556 not as aggressive as TCP Reno. 547 not as aggressive as TCP Reno.
557 548
558 config TCP_CONG_NV 549 config TCP_CONG_NV
559 tristate "TCP NV" 550 tristate "TCP NV"
560 default n 551 default n
561 help 552 help
562 TCP NV is a follow up to TCP Vegas. 553 TCP NV is a follow up to TCP Vegas. It has been modified to deal with
563 10G networks, measurement noise intr 554 10G networks, measurement noise introduced by LRO, GRO and interrupt
564 coalescence. In addition, it will de 555 coalescence. In addition, it will decrease its cwnd multiplicatively
565 instead of linearly. 556 instead of linearly.
566 557
567 Note that in general congestion avoi 558 Note that in general congestion avoidance (cwnd decreased when # packets
568 queued grows) cannot coexist with co 559 queued grows) cannot coexist with congestion control (cwnd decreased only
569 when there is packet loss) due to fa 560 when there is packet loss) due to fairness issues. One scenario when they
570 can coexist safely is when the CA fl 561 can coexist safely is when the CA flows have RTTs << CC flows RTTs.
571 562
572 For further details see http://www.b 563 For further details see http://www.brakmo.org/networking/tcp-nv/
573 564
574 config TCP_CONG_SCALABLE 565 config TCP_CONG_SCALABLE
575 tristate "Scalable TCP" 566 tristate "Scalable TCP"
576 default n 567 default n
577 help 568 help
578 Scalable TCP is a sender-side only c 569 Scalable TCP is a sender-side only change to TCP which uses a
579 MIMD congestion control algorithm wh 570 MIMD congestion control algorithm which has some nice scaling
580 properties, though is known to have 571 properties, though is known to have fairness issues.
581 See http://www.deneholme.net/tom/sca 572 See http://www.deneholme.net/tom/scalable/
582 573
583 config TCP_CONG_LP 574 config TCP_CONG_LP
584 tristate "TCP Low Priority" 575 tristate "TCP Low Priority"
585 default n 576 default n
586 help 577 help
587 TCP Low Priority (TCP-LP), a distrib 578 TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
588 to utilize only the excess network b 579 to utilize only the excess network bandwidth as compared to the
589 ``fair share`` of bandwidth as targe 580 ``fair share`` of bandwidth as targeted by TCP.
590 See http://www-ece.rice.edu/networks 581 See http://www-ece.rice.edu/networks/TCP-LP/
591 582
592 config TCP_CONG_VENO 583 config TCP_CONG_VENO
593 tristate "TCP Veno" 584 tristate "TCP Veno"
594 default n 585 default n
595 help 586 help
596 TCP Veno is a sender-side only enhan 587 TCP Veno is a sender-side only enhancement of TCP to obtain better
597 throughput over wireless networks. T 588 throughput over wireless networks. TCP Veno makes use of state
598 distinguishing to circumvent the dif 589 distinguishing to circumvent the difficult judgment of the packet loss
599 type. TCP Veno cuts down less conges 590 type. TCP Veno cuts down less congestion window in response to random
600 loss packets. 591 loss packets.
601 See <http://ieeexplore.ieee.org/xpl/ 592 See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186>
602 593
603 config TCP_CONG_YEAH 594 config TCP_CONG_YEAH
604 tristate "YeAH TCP" 595 tristate "YeAH TCP"
605 select TCP_CONG_VEGAS 596 select TCP_CONG_VEGAS
606 default n 597 default n
607 help 598 help
608 YeAH-TCP is a sender-side high-speed 599 YeAH-TCP is a sender-side high-speed enabled TCP congestion control
609 algorithm, which uses a mixed loss/d 600 algorithm, which uses a mixed loss/delay approach to compute the
610 congestion window. It's design goals 601 congestion window. It's design goals target high efficiency,
611 internal, RTT and Reno fairness, res 602 internal, RTT and Reno fairness, resilience to link loss while
612 keeping network elements load as low 603 keeping network elements load as low as possible.
613 604
614 For further details look here: 605 For further details look here:
615 http://wil.cs.caltech.edu/pfldnet2 606 http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
616 607
617 config TCP_CONG_ILLINOIS 608 config TCP_CONG_ILLINOIS
618 tristate "TCP Illinois" 609 tristate "TCP Illinois"
619 default n 610 default n
620 help 611 help
621 TCP-Illinois is a sender-side modifi 612 TCP-Illinois is a sender-side modification of TCP Reno for
622 high speed long delay links. It uses 613 high speed long delay links. It uses round-trip-time to
623 adjust the alpha and beta parameters 614 adjust the alpha and beta parameters to achieve a higher average
624 throughput and maintain fairness. 615 throughput and maintain fairness.
625 616
626 For further details see: 617 For further details see:
627 http://www.ews.uiuc.edu/~shaoliu/t 618 http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
628 619
629 config TCP_CONG_DCTCP 620 config TCP_CONG_DCTCP
630 tristate "DataCenter TCP (DCTCP)" 621 tristate "DataCenter TCP (DCTCP)"
631 default n 622 default n
632 help 623 help
633 DCTCP leverages Explicit Congestion 624 DCTCP leverages Explicit Congestion Notification (ECN) in the network to
634 provide multi-bit feedback to the en 625 provide multi-bit feedback to the end hosts. It is designed to provide:
635 626
636 - High burst tolerance (incast due t 627 - High burst tolerance (incast due to partition/aggregate),
637 - Low latency (short flows, queries) 628 - Low latency (short flows, queries),
638 - High throughput (continuous data u 629 - High throughput (continuous data updates, large file transfers) with
639 commodity, shallow-buffered switch 630 commodity, shallow-buffered switches.
640 631
641 All switches in the data center netw 632 All switches in the data center network running DCTCP must support
642 ECN marking and be configured for ma 633 ECN marking and be configured for marking when reaching defined switch
643 buffer thresholds. The default ECN m 634 buffer thresholds. The default ECN marking threshold heuristic for
644 DCTCP on switches is 20 packets (30K 635 DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
645 (~100KB) at 10Gbps, but might need f 636 (~100KB) at 10Gbps, but might need further careful tweaking.
646 637
647 For further details see: 638 For further details see:
648 http://simula.stanford.edu/~alizad 639 http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
649 640
650 config TCP_CONG_CDG 641 config TCP_CONG_CDG
651 tristate "CAIA Delay-Gradient (CDG)" 642 tristate "CAIA Delay-Gradient (CDG)"
652 default n 643 default n
653 help 644 help
654 CAIA Delay-Gradient (CDG) is a TCP c 645 CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
655 the TCP sender in order to: 646 the TCP sender in order to:
656 647
657 o Use the delay gradient as a conges 648 o Use the delay gradient as a congestion signal.
658 o Back off with an average probabili 649 o Back off with an average probability that is independent of the RTT.
659 o Coexist with flows that use loss-b 650 o Coexist with flows that use loss-based congestion control.
660 o Tolerate packet loss unrelated to 651 o Tolerate packet loss unrelated to congestion.
661 652
662 For further details see: 653 For further details see:
663 D.A. Hayes and G. Armitage. "Revis 654 D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
664 delay gradients." In Networking 20 !! 655 delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg
665 http://caia.swin.edu.au/cv/dahayes <<
666 656
667 config TCP_CONG_BBR 657 config TCP_CONG_BBR
668 tristate "BBR TCP" 658 tristate "BBR TCP"
669 default n 659 default n
670 help 660 help
671 661
672 BBR (Bottleneck Bandwidth and RTT) T 662 BBR (Bottleneck Bandwidth and RTT) TCP congestion control aims to
673 maximize network utilization and min 663 maximize network utilization and minimize queues. It builds an explicit
674 model of the bottleneck delivery rat 664 model of the bottleneck delivery rate and path round-trip propagation
675 delay. It tolerates packet loss and 665 delay. It tolerates packet loss and delay unrelated to congestion. It
676 can operate over LAN, WAN, cellular, 666 can operate over LAN, WAN, cellular, wifi, or cable modem links. It can
677 coexist with flows that use loss-bas 667 coexist with flows that use loss-based congestion control, and can
678 operate with shallow buffers, deep b 668 operate with shallow buffers, deep buffers, bufferbloat, policers, or
679 AQM schemes that do not provide a de 669 AQM schemes that do not provide a delay signal. It requires the fq
680 ("Fair Queue") pacing packet schedul 670 ("Fair Queue") pacing packet scheduler.
681 671
682 choice 672 choice
683 prompt "Default TCP congestion control 673 prompt "Default TCP congestion control"
684 default DEFAULT_CUBIC 674 default DEFAULT_CUBIC
685 help 675 help
686 Select the TCP congestion control th 676 Select the TCP congestion control that will be used by default
687 for all connections. 677 for all connections.
688 678
689 config DEFAULT_BIC 679 config DEFAULT_BIC
690 bool "Bic" if TCP_CONG_BIC=y 680 bool "Bic" if TCP_CONG_BIC=y
691 681
692 config DEFAULT_CUBIC 682 config DEFAULT_CUBIC
693 bool "Cubic" if TCP_CONG_CUBIC 683 bool "Cubic" if TCP_CONG_CUBIC=y
694 684
695 config DEFAULT_HTCP 685 config DEFAULT_HTCP
696 bool "Htcp" if TCP_CONG_HTCP=y 686 bool "Htcp" if TCP_CONG_HTCP=y
697 687
698 config DEFAULT_HYBLA 688 config DEFAULT_HYBLA
699 bool "Hybla" if TCP_CONG_HYBLA 689 bool "Hybla" if TCP_CONG_HYBLA=y
700 690
701 config DEFAULT_VEGAS 691 config DEFAULT_VEGAS
702 bool "Vegas" if TCP_CONG_VEGAS 692 bool "Vegas" if TCP_CONG_VEGAS=y
703 693
704 config DEFAULT_VENO 694 config DEFAULT_VENO
705 bool "Veno" if TCP_CONG_VENO=y 695 bool "Veno" if TCP_CONG_VENO=y
706 696
707 config DEFAULT_WESTWOOD 697 config DEFAULT_WESTWOOD
708 bool "Westwood" if TCP_CONG_WE 698 bool "Westwood" if TCP_CONG_WESTWOOD=y
709 699
710 config DEFAULT_DCTCP 700 config DEFAULT_DCTCP
711 bool "DCTCP" if TCP_CONG_DCTCP 701 bool "DCTCP" if TCP_CONG_DCTCP=y
712 702
713 config DEFAULT_CDG 703 config DEFAULT_CDG
714 bool "CDG" if TCP_CONG_CDG=y 704 bool "CDG" if TCP_CONG_CDG=y
715 705
716 config DEFAULT_BBR 706 config DEFAULT_BBR
717 bool "BBR" if TCP_CONG_BBR=y 707 bool "BBR" if TCP_CONG_BBR=y
718 708
719 config DEFAULT_RENO 709 config DEFAULT_RENO
720 bool "Reno" 710 bool "Reno"
721 endchoice 711 endchoice
722 712
723 endif 713 endif
724 714
725 config TCP_CONG_CUBIC 715 config TCP_CONG_CUBIC
726 tristate 716 tristate
727 depends on !TCP_CONG_ADVANCED 717 depends on !TCP_CONG_ADVANCED
728 default y 718 default y
729 719
730 config DEFAULT_TCP_CONG 720 config DEFAULT_TCP_CONG
731 string 721 string
732 default "bic" if DEFAULT_BIC 722 default "bic" if DEFAULT_BIC
733 default "cubic" if DEFAULT_CUBIC 723 default "cubic" if DEFAULT_CUBIC
734 default "htcp" if DEFAULT_HTCP 724 default "htcp" if DEFAULT_HTCP
735 default "hybla" if DEFAULT_HYBLA 725 default "hybla" if DEFAULT_HYBLA
736 default "vegas" if DEFAULT_VEGAS 726 default "vegas" if DEFAULT_VEGAS
737 default "westwood" if DEFAULT_WESTWOOD 727 default "westwood" if DEFAULT_WESTWOOD
738 default "veno" if DEFAULT_VENO 728 default "veno" if DEFAULT_VENO
739 default "reno" if DEFAULT_RENO 729 default "reno" if DEFAULT_RENO
740 default "dctcp" if DEFAULT_DCTCP 730 default "dctcp" if DEFAULT_DCTCP
741 default "cdg" if DEFAULT_CDG 731 default "cdg" if DEFAULT_CDG
742 default "bbr" if DEFAULT_BBR 732 default "bbr" if DEFAULT_BBR
743 default "cubic" 733 default "cubic"
744 734
745 config TCP_SIGPOOL <<
746 tristate <<
747 <<
748 config TCP_AO <<
749 bool "TCP: Authentication Option (RFC5 <<
750 select CRYPTO <<
751 select TCP_SIGPOOL <<
752 depends on 64BIT && IPV6 != m # seq-nu <<
753 help <<
754 TCP-AO specifies the use of stronger <<
755 protects against replays for long-li <<
756 provides more details on the associa <<
757 connections than TCP MD5 (See RFC592 <<
758 <<
759 If unsure, say N. <<
760 <<
761 config TCP_MD5SIG 735 config TCP_MD5SIG
762 bool "TCP: MD5 Signature Option suppor 736 bool "TCP: MD5 Signature Option support (RFC2385)"
763 select CRYPTO 737 select CRYPTO
764 select CRYPTO_MD5 738 select CRYPTO_MD5
765 select TCP_SIGPOOL <<
766 help 739 help
767 RFC2385 specifies a method of giving 740 RFC2385 specifies a method of giving MD5 protection to TCP sessions.
768 Its main (only?) use is to protect B 741 Its main (only?) use is to protect BGP sessions between core routers
769 on the Internet. 742 on the Internet.
770 743
771 If unsure, say N. 744 If unsure, say N.
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