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 NET_UDP_TUNNEL 324 select NET_UDP_TUNNEL
325 help 325 help
326 Foo over UDP allows any IP protocol 326 Foo over UDP allows any IP protocol to be directly encapsulated
327 over UDP include tunnels (IPIP, GRE, 327 over UDP include tunnels (IPIP, GRE, SIT). By encapsulating in UDP
328 network mechanisms and optimizations 328 network mechanisms and optimizations for UDP (such as ECMP
329 and RSS) can be leveraged to provide 329 and RSS) can be leveraged to provide better service.
330 330
331 config NET_FOU_IP_TUNNELS 331 config NET_FOU_IP_TUNNELS
332 bool "IP: FOU encapsulation of IP tunn 332 bool "IP: FOU encapsulation of IP tunnels"
333 depends on NET_IPIP || NET_IPGRE || IP 333 depends on NET_IPIP || NET_IPGRE || IPV6_SIT
334 select NET_FOU 334 select NET_FOU
335 help 335 help
336 Allow configuration of FOU or GUE en 336 Allow configuration of FOU or GUE encapsulation for IP tunnels.
337 When this option is enabled IP tunne 337 When this option is enabled IP tunnels can be configured to use
338 FOU or GUE encapsulation. 338 FOU or GUE encapsulation.
339 339
340 config INET_AH 340 config INET_AH
341 tristate "IP: AH transformation" 341 tristate "IP: AH transformation"
342 select XFRM_AH 342 select XFRM_AH
343 help 343 help
344 Support for IPsec AH (Authentication 344 Support for IPsec AH (Authentication Header).
345 345
346 AH can be used with various authenti 346 AH can be used with various authentication algorithms. Besides
347 enabling AH support itself, this opt 347 enabling AH support itself, this option enables the generic
348 implementations of the algorithms th 348 implementations of the algorithms that RFC 8221 lists as MUST be
349 implemented. If you need any other 349 implemented. If you need any other algorithms, you'll need to enable
350 them in the crypto API. You should 350 them in the crypto API. You should also enable accelerated
351 implementations of any needed algori 351 implementations of any needed algorithms when available.
352 352
353 If unsure, say Y. 353 If unsure, say Y.
354 354
355 config INET_ESP 355 config INET_ESP
356 tristate "IP: ESP transformation" 356 tristate "IP: ESP transformation"
357 select XFRM_ESP 357 select XFRM_ESP
358 help 358 help
359 Support for IPsec ESP (Encapsulating 359 Support for IPsec ESP (Encapsulating Security Payload).
360 360
361 ESP can be used with various encrypt 361 ESP can be used with various encryption and authentication algorithms.
362 Besides enabling ESP support itself, 362 Besides enabling ESP support itself, this option enables the generic
363 implementations of the algorithms th 363 implementations of the algorithms that RFC 8221 lists as MUST be
364 implemented. If you need any other 364 implemented. If you need any other algorithms, you'll need to enable
365 them in the crypto API. You should 365 them in the crypto API. You should also enable accelerated
366 implementations of any needed algori 366 implementations of any needed algorithms when available.
367 367
368 If unsure, say Y. 368 If unsure, say Y.
369 369
370 config INET_ESP_OFFLOAD 370 config INET_ESP_OFFLOAD
371 tristate "IP: ESP transformation offlo 371 tristate "IP: ESP transformation offload"
372 depends on INET_ESP 372 depends on INET_ESP
373 select XFRM_OFFLOAD 373 select XFRM_OFFLOAD
374 default n 374 default n
375 help 375 help
376 Support for ESP transformation offlo 376 Support for ESP transformation offload. This makes sense
377 only if this system really does IPse 377 only if this system really does IPsec and want to do it
378 with high throughput. A typical desk 378 with high throughput. A typical desktop system does not
379 need it, even if it does IPsec. 379 need it, even if it does IPsec.
380 380
381 If unsure, say N. 381 If unsure, say N.
382 382
383 config INET_ESPINTCP 383 config INET_ESPINTCP
384 bool "IP: ESP in TCP encapsulation (RF 384 bool "IP: ESP in TCP encapsulation (RFC 8229)"
385 depends on XFRM && INET_ESP 385 depends on XFRM && INET_ESP
386 select STREAM_PARSER 386 select STREAM_PARSER
387 select NET_SOCK_MSG 387 select NET_SOCK_MSG
388 select XFRM_ESPINTCP 388 select XFRM_ESPINTCP
389 help 389 help
390 Support for RFC 8229 encapsulation o 390 Support for RFC 8229 encapsulation of ESP and IKE over
391 TCP/IPv4 sockets. 391 TCP/IPv4 sockets.
392 392
393 If unsure, say N. 393 If unsure, say N.
394 394
395 config INET_IPCOMP 395 config INET_IPCOMP
396 tristate "IP: IPComp transformation" 396 tristate "IP: IPComp transformation"
397 select INET_XFRM_TUNNEL 397 select INET_XFRM_TUNNEL
398 select XFRM_IPCOMP 398 select XFRM_IPCOMP
399 help 399 help
400 Support for IP Payload Compression P 400 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
401 typically needed for IPsec. 401 typically needed for IPsec.
402 402
403 If unsure, say Y. 403 If unsure, say Y.
404 404
405 config INET_TABLE_PERTURB_ORDER 405 config INET_TABLE_PERTURB_ORDER
406 int "INET: Source port perturbation ta 406 int "INET: Source port perturbation table size (as power of 2)" if EXPERT
407 default 16 407 default 16
408 help 408 help
409 Source port perturbation table size 409 Source port perturbation table size (as power of 2) for
410 RFC 6056 3.3.4. Algorithm 4: Double 410 RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm.
411 411
412 The default is almost always what yo 412 The default is almost always what you want.
413 Only change this if you know what yo 413 Only change this if you know what you are doing.
414 414
415 config INET_XFRM_TUNNEL 415 config INET_XFRM_TUNNEL
416 tristate 416 tristate
417 select INET_TUNNEL 417 select INET_TUNNEL
418 default n 418 default n
419 419
420 config INET_TUNNEL 420 config INET_TUNNEL
421 tristate 421 tristate
422 default n 422 default n
423 423
424 config INET_DIAG 424 config INET_DIAG
425 tristate "INET: socket monitoring inte 425 tristate "INET: socket monitoring interface"
426 default y 426 default y
427 help 427 help
428 Support for INET (TCP, DCCP, etc) so 428 Support for INET (TCP, DCCP, etc) socket monitoring interface used by
429 native Linux tools such as ss. ss is 429 native Linux tools such as ss. ss is included in iproute2, currently
430 downloadable at: 430 downloadable at:
431 431
432 http://www.linuxfoundation.org/col 432 http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2
433 433
434 If unsure, say Y. 434 If unsure, say Y.
435 435
436 config INET_TCP_DIAG 436 config INET_TCP_DIAG
437 depends on INET_DIAG 437 depends on INET_DIAG
438 def_tristate INET_DIAG 438 def_tristate INET_DIAG
439 439
440 config INET_UDP_DIAG 440 config INET_UDP_DIAG
441 tristate "UDP: socket monitoring inter 441 tristate "UDP: socket monitoring interface"
442 depends on INET_DIAG && (IPV6 || IPV6= 442 depends on INET_DIAG && (IPV6 || IPV6=n)
443 default n 443 default n
444 help 444 help
445 Support for UDP socket monitoring in 445 Support for UDP socket monitoring interface used by the ss tool.
446 If unsure, say Y. 446 If unsure, say Y.
447 447
448 config INET_RAW_DIAG 448 config INET_RAW_DIAG
449 tristate "RAW: socket monitoring inter 449 tristate "RAW: socket monitoring interface"
450 depends on INET_DIAG && (IPV6 || IPV6= 450 depends on INET_DIAG && (IPV6 || IPV6=n)
451 default n 451 default n
452 help 452 help
453 Support for RAW socket monitoring in 453 Support for RAW socket monitoring interface used by the ss tool.
454 If unsure, say Y. 454 If unsure, say Y.
455 455
456 config INET_DIAG_DESTROY 456 config INET_DIAG_DESTROY
457 bool "INET: allow privileged process t 457 bool "INET: allow privileged process to administratively close sockets"
458 depends on INET_DIAG 458 depends on INET_DIAG
459 default n 459 default n
460 help 460 help
461 Provides a SOCK_DESTROY operation th 461 Provides a SOCK_DESTROY operation that allows privileged processes
462 (e.g., a connection manager or a net 462 (e.g., a connection manager or a network administration tool such as
463 ss) to close sockets opened by other 463 ss) to close sockets opened by other processes. Closing a socket in
464 this way interrupts any blocking rea 464 this way interrupts any blocking read/write/connect operations on
465 the socket and causes future socket 465 the socket and causes future socket calls to behave as if the socket
466 had been disconnected. 466 had been disconnected.
467 If unsure, say N. 467 If unsure, say N.
468 468
469 menuconfig TCP_CONG_ADVANCED 469 menuconfig TCP_CONG_ADVANCED
470 bool "TCP: advanced congestion control 470 bool "TCP: advanced congestion control"
471 help 471 help
472 Support for selection of various TCP 472 Support for selection of various TCP congestion control
473 modules. 473 modules.
474 474
475 Nearly all users can safely say no h 475 Nearly all users can safely say no here, and a safe default
476 selection will be made (CUBIC with n 476 selection will be made (CUBIC with new Reno as a fallback).
477 477
478 If unsure, say N. 478 If unsure, say N.
479 479
480 if TCP_CONG_ADVANCED 480 if TCP_CONG_ADVANCED
481 481
482 config TCP_CONG_BIC 482 config TCP_CONG_BIC
483 tristate "Binary Increase Congestion ( 483 tristate "Binary Increase Congestion (BIC) control"
484 default m 484 default m
485 help 485 help
486 BIC-TCP is a sender-side only change 486 BIC-TCP is a sender-side only change that ensures a linear RTT
487 fairness under large windows while o 487 fairness under large windows while offering both scalability and
488 bounded TCP-friendliness. The protoc 488 bounded TCP-friendliness. The protocol combines two schemes
489 called additive increase and binary 489 called additive increase and binary search increase. When the
490 congestion window is large, additive 490 congestion window is large, additive increase with a large
491 increment ensures linear RTT fairnes 491 increment ensures linear RTT fairness as well as good
492 scalability. Under small congestion 492 scalability. Under small congestion windows, binary search
493 increase provides TCP friendliness. 493 increase provides TCP friendliness.
494 See http://www.csc.ncsu.edu/faculty/ 494 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
495 495
496 config TCP_CONG_CUBIC 496 config TCP_CONG_CUBIC
497 tristate "CUBIC TCP" 497 tristate "CUBIC TCP"
498 default y 498 default y
499 help 499 help
500 This is version 2.0 of BIC-TCP which 500 This is version 2.0 of BIC-TCP which uses a cubic growth function
501 among other techniques. 501 among other techniques.
502 See http://www.csc.ncsu.edu/faculty/ 502 See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
503 503
504 config TCP_CONG_WESTWOOD 504 config TCP_CONG_WESTWOOD
505 tristate "TCP Westwood+" 505 tristate "TCP Westwood+"
506 default m 506 default m
507 help 507 help
508 TCP Westwood+ is a sender-side only 508 TCP Westwood+ is a sender-side only modification of the TCP Reno
509 protocol stack that optimizes the pe 509 protocol stack that optimizes the performance of TCP congestion
510 control. It is based on end-to-end b 510 control. It is based on end-to-end bandwidth estimation to set
511 congestion window and slow start thr 511 congestion window and slow start threshold after a congestion
512 episode. Using this estimation, TCP 512 episode. Using this estimation, TCP Westwood+ adaptively sets a
513 slow start threshold and a congestio 513 slow start threshold and a congestion window which takes into
514 account the bandwidth used at the t 514 account the bandwidth used at the time congestion is experienced.
515 TCP Westwood+ significantly increase 515 TCP Westwood+ significantly increases fairness wrt TCP Reno in
516 wired networks and throughput over w 516 wired networks and throughput over wireless links.
517 517
518 config TCP_CONG_HTCP 518 config TCP_CONG_HTCP
519 tristate "H-TCP" 519 tristate "H-TCP"
520 default m 520 default m
521 help 521 help
522 H-TCP is a send-side only modificati 522 H-TCP is a send-side only modifications of the TCP Reno
523 protocol stack that optimizes the pe 523 protocol stack that optimizes the performance of TCP
524 congestion control for high speed ne 524 congestion control for high speed network links. It uses a
525 modeswitch to change the alpha and b 525 modeswitch to change the alpha and beta parameters of TCP Reno
526 based on network conditions and in a 526 based on network conditions and in a way so as to be fair with
527 other Reno and H-TCP flows. 527 other Reno and H-TCP flows.
528 528
529 config TCP_CONG_HSTCP 529 config TCP_CONG_HSTCP
530 tristate "High Speed TCP" 530 tristate "High Speed TCP"
531 default n 531 default n
532 help 532 help
533 Sally Floyd's High Speed TCP (RFC 36 533 Sally Floyd's High Speed TCP (RFC 3649) congestion control.
534 A modification to TCP's congestion c 534 A modification to TCP's congestion control mechanism for use
535 with large congestion windows. A tab 535 with large congestion windows. A table indicates how much to
536 increase the congestion window by wh 536 increase the congestion window by when an ACK is received.
537 For more detail see https://www.icir 537 For more detail see https://www.icir.org/floyd/hstcp.html
538 538
539 config TCP_CONG_HYBLA 539 config TCP_CONG_HYBLA
540 tristate "TCP-Hybla congestion control 540 tristate "TCP-Hybla congestion control algorithm"
541 default n 541 default n
542 help 542 help
543 TCP-Hybla is a sender-side only chan 543 TCP-Hybla is a sender-side only change that eliminates penalization of
544 long-RTT, large-bandwidth connection 544 long-RTT, large-bandwidth connections, like when satellite legs are
545 involved, especially when sharing a 545 involved, especially when sharing a common bottleneck with normal
546 terrestrial connections. 546 terrestrial connections.
547 547
548 config TCP_CONG_VEGAS 548 config TCP_CONG_VEGAS
549 tristate "TCP Vegas" 549 tristate "TCP Vegas"
550 default n 550 default n
551 help 551 help
552 TCP Vegas is a sender-side only chan 552 TCP Vegas is a sender-side only change to TCP that anticipates
553 the onset of congestion by estimatin 553 the onset of congestion by estimating the bandwidth. TCP Vegas
554 adjusts the sending rate by modifyin 554 adjusts the sending rate by modifying the congestion
555 window. TCP Vegas should provide les 555 window. TCP Vegas should provide less packet loss, but it is
556 not as aggressive as TCP Reno. 556 not as aggressive as TCP Reno.
557 557
558 config TCP_CONG_NV 558 config TCP_CONG_NV
559 tristate "TCP NV" 559 tristate "TCP NV"
560 default n 560 default n
561 help 561 help
562 TCP NV is a follow up to TCP Vegas. 562 TCP NV is a follow up to TCP Vegas. It has been modified to deal with
563 10G networks, measurement noise intr 563 10G networks, measurement noise introduced by LRO, GRO and interrupt
564 coalescence. In addition, it will de 564 coalescence. In addition, it will decrease its cwnd multiplicatively
565 instead of linearly. 565 instead of linearly.
566 566
567 Note that in general congestion avoi 567 Note that in general congestion avoidance (cwnd decreased when # packets
568 queued grows) cannot coexist with co 568 queued grows) cannot coexist with congestion control (cwnd decreased only
569 when there is packet loss) due to fa 569 when there is packet loss) due to fairness issues. One scenario when they
570 can coexist safely is when the CA fl 570 can coexist safely is when the CA flows have RTTs << CC flows RTTs.
571 571
572 For further details see http://www.b 572 For further details see http://www.brakmo.org/networking/tcp-nv/
573 573
574 config TCP_CONG_SCALABLE 574 config TCP_CONG_SCALABLE
575 tristate "Scalable TCP" 575 tristate "Scalable TCP"
576 default n 576 default n
577 help 577 help
578 Scalable TCP is a sender-side only c 578 Scalable TCP is a sender-side only change to TCP which uses a
579 MIMD congestion control algorithm wh 579 MIMD congestion control algorithm which has some nice scaling
580 properties, though is known to have 580 properties, though is known to have fairness issues.
581 See http://www.deneholme.net/tom/sca 581 See http://www.deneholme.net/tom/scalable/
582 582
583 config TCP_CONG_LP 583 config TCP_CONG_LP
584 tristate "TCP Low Priority" 584 tristate "TCP Low Priority"
585 default n 585 default n
586 help 586 help
587 TCP Low Priority (TCP-LP), a distrib 587 TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
588 to utilize only the excess network b 588 to utilize only the excess network bandwidth as compared to the
589 ``fair share`` of bandwidth as targe 589 ``fair share`` of bandwidth as targeted by TCP.
590 See http://www-ece.rice.edu/networks 590 See http://www-ece.rice.edu/networks/TCP-LP/
591 591
592 config TCP_CONG_VENO 592 config TCP_CONG_VENO
593 tristate "TCP Veno" 593 tristate "TCP Veno"
594 default n 594 default n
595 help 595 help
596 TCP Veno is a sender-side only enhan 596 TCP Veno is a sender-side only enhancement of TCP to obtain better
597 throughput over wireless networks. T 597 throughput over wireless networks. TCP Veno makes use of state
598 distinguishing to circumvent the dif 598 distinguishing to circumvent the difficult judgment of the packet loss
599 type. TCP Veno cuts down less conges 599 type. TCP Veno cuts down less congestion window in response to random
600 loss packets. 600 loss packets.
601 See <http://ieeexplore.ieee.org/xpl/ 601 See <http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1177186>
602 602
603 config TCP_CONG_YEAH 603 config TCP_CONG_YEAH
604 tristate "YeAH TCP" 604 tristate "YeAH TCP"
605 select TCP_CONG_VEGAS 605 select TCP_CONG_VEGAS
606 default n 606 default n
607 help 607 help
608 YeAH-TCP is a sender-side high-speed 608 YeAH-TCP is a sender-side high-speed enabled TCP congestion control
609 algorithm, which uses a mixed loss/d 609 algorithm, which uses a mixed loss/delay approach to compute the
610 congestion window. It's design goals 610 congestion window. It's design goals target high efficiency,
611 internal, RTT and Reno fairness, res 611 internal, RTT and Reno fairness, resilience to link loss while
612 keeping network elements load as low 612 keeping network elements load as low as possible.
613 613
614 For further details look here: 614 For further details look here:
615 http://wil.cs.caltech.edu/pfldnet2 615 http://wil.cs.caltech.edu/pfldnet2007/paper/YeAH_TCP.pdf
616 616
617 config TCP_CONG_ILLINOIS 617 config TCP_CONG_ILLINOIS
618 tristate "TCP Illinois" 618 tristate "TCP Illinois"
619 default n 619 default n
620 help 620 help
621 TCP-Illinois is a sender-side modifi 621 TCP-Illinois is a sender-side modification of TCP Reno for
622 high speed long delay links. It uses 622 high speed long delay links. It uses round-trip-time to
623 adjust the alpha and beta parameters 623 adjust the alpha and beta parameters to achieve a higher average
624 throughput and maintain fairness. 624 throughput and maintain fairness.
625 625
626 For further details see: 626 For further details see:
627 http://www.ews.uiuc.edu/~shaoliu/t 627 http://www.ews.uiuc.edu/~shaoliu/tcpillinois/index.html
628 628
629 config TCP_CONG_DCTCP 629 config TCP_CONG_DCTCP
630 tristate "DataCenter TCP (DCTCP)" 630 tristate "DataCenter TCP (DCTCP)"
631 default n 631 default n
632 help 632 help
633 DCTCP leverages Explicit Congestion 633 DCTCP leverages Explicit Congestion Notification (ECN) in the network to
634 provide multi-bit feedback to the en 634 provide multi-bit feedback to the end hosts. It is designed to provide:
635 635
636 - High burst tolerance (incast due t 636 - High burst tolerance (incast due to partition/aggregate),
637 - Low latency (short flows, queries) 637 - Low latency (short flows, queries),
638 - High throughput (continuous data u 638 - High throughput (continuous data updates, large file transfers) with
639 commodity, shallow-buffered switch 639 commodity, shallow-buffered switches.
640 640
641 All switches in the data center netw 641 All switches in the data center network running DCTCP must support
642 ECN marking and be configured for ma 642 ECN marking and be configured for marking when reaching defined switch
643 buffer thresholds. The default ECN m 643 buffer thresholds. The default ECN marking threshold heuristic for
644 DCTCP on switches is 20 packets (30K 644 DCTCP on switches is 20 packets (30KB) at 1Gbps, and 65 packets
645 (~100KB) at 10Gbps, but might need f 645 (~100KB) at 10Gbps, but might need further careful tweaking.
646 646
647 For further details see: 647 For further details see:
648 http://simula.stanford.edu/~alizad 648 http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
649 649
650 config TCP_CONG_CDG 650 config TCP_CONG_CDG
651 tristate "CAIA Delay-Gradient (CDG)" 651 tristate "CAIA Delay-Gradient (CDG)"
652 default n 652 default n
653 help 653 help
654 CAIA Delay-Gradient (CDG) is a TCP c 654 CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
655 the TCP sender in order to: 655 the TCP sender in order to:
656 656
657 o Use the delay gradient as a conges 657 o Use the delay gradient as a congestion signal.
658 o Back off with an average probabili 658 o Back off with an average probability that is independent of the RTT.
659 o Coexist with flows that use loss-b 659 o Coexist with flows that use loss-based congestion control.
660 o Tolerate packet loss unrelated to 660 o Tolerate packet loss unrelated to congestion.
661 661
662 For further details see: 662 For further details see:
663 D.A. Hayes and G. Armitage. "Revis 663 D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
664 delay gradients." In Networking 20 664 delay gradients." In Networking 2011. Preprint:
665 http://caia.swin.edu.au/cv/dahayes 665 http://caia.swin.edu.au/cv/dahayes/content/networking2011-cdg-preprint.pdf
666 666
667 config TCP_CONG_BBR 667 config TCP_CONG_BBR
668 tristate "BBR TCP" 668 tristate "BBR TCP"
669 default n 669 default n
670 help 670 help
671 671
672 BBR (Bottleneck Bandwidth and RTT) T 672 BBR (Bottleneck Bandwidth and RTT) TCP congestion control aims to
673 maximize network utilization and min 673 maximize network utilization and minimize queues. It builds an explicit
674 model of the bottleneck delivery rat 674 model of the bottleneck delivery rate and path round-trip propagation
675 delay. It tolerates packet loss and 675 delay. It tolerates packet loss and delay unrelated to congestion. It
676 can operate over LAN, WAN, cellular, 676 can operate over LAN, WAN, cellular, wifi, or cable modem links. It can
677 coexist with flows that use loss-bas 677 coexist with flows that use loss-based congestion control, and can
678 operate with shallow buffers, deep b 678 operate with shallow buffers, deep buffers, bufferbloat, policers, or
679 AQM schemes that do not provide a de 679 AQM schemes that do not provide a delay signal. It requires the fq
680 ("Fair Queue") pacing packet schedul 680 ("Fair Queue") pacing packet scheduler.
681 681
682 choice 682 choice
683 prompt "Default TCP congestion control 683 prompt "Default TCP congestion control"
684 default DEFAULT_CUBIC 684 default DEFAULT_CUBIC
685 help 685 help
686 Select the TCP congestion control th 686 Select the TCP congestion control that will be used by default
687 for all connections. 687 for all connections.
688 688
689 config DEFAULT_BIC 689 config DEFAULT_BIC
690 bool "Bic" if TCP_CONG_BIC=y 690 bool "Bic" if TCP_CONG_BIC=y
691 691
692 config DEFAULT_CUBIC 692 config DEFAULT_CUBIC
693 bool "Cubic" if TCP_CONG_CUBIC 693 bool "Cubic" if TCP_CONG_CUBIC=y
694 694
695 config DEFAULT_HTCP 695 config DEFAULT_HTCP
696 bool "Htcp" if TCP_CONG_HTCP=y 696 bool "Htcp" if TCP_CONG_HTCP=y
697 697
698 config DEFAULT_HYBLA 698 config DEFAULT_HYBLA
699 bool "Hybla" if TCP_CONG_HYBLA 699 bool "Hybla" if TCP_CONG_HYBLA=y
700 700
701 config DEFAULT_VEGAS 701 config DEFAULT_VEGAS
702 bool "Vegas" if TCP_CONG_VEGAS 702 bool "Vegas" if TCP_CONG_VEGAS=y
703 703
704 config DEFAULT_VENO 704 config DEFAULT_VENO
705 bool "Veno" if TCP_CONG_VENO=y 705 bool "Veno" if TCP_CONG_VENO=y
706 706
707 config DEFAULT_WESTWOOD 707 config DEFAULT_WESTWOOD
708 bool "Westwood" if TCP_CONG_WE 708 bool "Westwood" if TCP_CONG_WESTWOOD=y
709 709
710 config DEFAULT_DCTCP 710 config DEFAULT_DCTCP
711 bool "DCTCP" if TCP_CONG_DCTCP 711 bool "DCTCP" if TCP_CONG_DCTCP=y
712 712
713 config DEFAULT_CDG 713 config DEFAULT_CDG
714 bool "CDG" if TCP_CONG_CDG=y 714 bool "CDG" if TCP_CONG_CDG=y
715 715
716 config DEFAULT_BBR 716 config DEFAULT_BBR
717 bool "BBR" if TCP_CONG_BBR=y 717 bool "BBR" if TCP_CONG_BBR=y
718 718
719 config DEFAULT_RENO 719 config DEFAULT_RENO
720 bool "Reno" 720 bool "Reno"
721 endchoice 721 endchoice
722 722
723 endif 723 endif
724 724
725 config TCP_CONG_CUBIC 725 config TCP_CONG_CUBIC
726 tristate 726 tristate
727 depends on !TCP_CONG_ADVANCED 727 depends on !TCP_CONG_ADVANCED
728 default y 728 default y
729 729
730 config DEFAULT_TCP_CONG 730 config DEFAULT_TCP_CONG
731 string 731 string
732 default "bic" if DEFAULT_BIC 732 default "bic" if DEFAULT_BIC
733 default "cubic" if DEFAULT_CUBIC 733 default "cubic" if DEFAULT_CUBIC
734 default "htcp" if DEFAULT_HTCP 734 default "htcp" if DEFAULT_HTCP
735 default "hybla" if DEFAULT_HYBLA 735 default "hybla" if DEFAULT_HYBLA
736 default "vegas" if DEFAULT_VEGAS 736 default "vegas" if DEFAULT_VEGAS
737 default "westwood" if DEFAULT_WESTWOOD 737 default "westwood" if DEFAULT_WESTWOOD
738 default "veno" if DEFAULT_VENO 738 default "veno" if DEFAULT_VENO
739 default "reno" if DEFAULT_RENO 739 default "reno" if DEFAULT_RENO
740 default "dctcp" if DEFAULT_DCTCP 740 default "dctcp" if DEFAULT_DCTCP
741 default "cdg" if DEFAULT_CDG 741 default "cdg" if DEFAULT_CDG
742 default "bbr" if DEFAULT_BBR 742 default "bbr" if DEFAULT_BBR
743 default "cubic" 743 default "cubic"
744 744
745 config TCP_SIGPOOL 745 config TCP_SIGPOOL
746 tristate 746 tristate
747 747
748 config TCP_AO 748 config TCP_AO
749 bool "TCP: Authentication Option (RFC5 749 bool "TCP: Authentication Option (RFC5925)"
750 select CRYPTO 750 select CRYPTO
751 select TCP_SIGPOOL 751 select TCP_SIGPOOL
752 depends on 64BIT && IPV6 != m # seq-nu 752 depends on 64BIT && IPV6 != m # seq-number extension needs WRITE_ONCE(u64)
753 help 753 help
754 TCP-AO specifies the use of stronger 754 TCP-AO specifies the use of stronger Message Authentication Codes (MACs),
755 protects against replays for long-li 755 protects against replays for long-lived TCP connections, and
756 provides more details on the associa 756 provides more details on the association of security with TCP
757 connections than TCP MD5 (See RFC592 757 connections than TCP MD5 (See RFC5925)
758 758
759 If unsure, say N. 759 If unsure, say N.
760 760
761 config TCP_MD5SIG 761 config TCP_MD5SIG
762 bool "TCP: MD5 Signature Option suppor 762 bool "TCP: MD5 Signature Option support (RFC2385)"
763 select CRYPTO 763 select CRYPTO
764 select CRYPTO_MD5 764 select CRYPTO_MD5
765 select TCP_SIGPOOL 765 select TCP_SIGPOOL
766 help 766 help
767 RFC2385 specifies a method of giving 767 RFC2385 specifies a method of giving MD5 protection to TCP sessions.
768 Its main (only?) use is to protect B 768 Its main (only?) use is to protect BGP sessions between core routers
769 on the Internet. 769 on the Internet.
770 770
771 If unsure, say N. 771 If unsure, say N.
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