1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # Network configuration 3 # Network configuration
4 # 4 #
5 5
6 menuconfig NET 6 menuconfig NET
7 bool "Networking support" 7 bool "Networking support"
8 select NLATTR 8 select NLATTR
9 select GENERIC_NET_UTILS 9 select GENERIC_NET_UTILS
10 select BPF 10 select BPF
11 help 11 help
12 Unless you really know what you are 12 Unless you really know what you are doing, you should say Y here.
13 The reason is that some programs nee 13 The reason is that some programs need kernel networking support even
14 when running on a stand-alone machin 14 when running on a stand-alone machine that isn't connected to any
15 other computer. 15 other computer.
16 16
17 If you are upgrading from an older k 17 If you are upgrading from an older kernel, you
18 should consider updating your networ 18 should consider updating your networking tools too because changes
19 in the kernel and the tools often go 19 in the kernel and the tools often go hand in hand. The tools are
20 contained in the package net-tools, 20 contained in the package net-tools, the location and version number
21 of which are given in <file:Document 21 of which are given in <file:Documentation/Changes>.
22 22
23 For a general introduction to Linux 23 For a general introduction to Linux networking, it is highly
24 recommended to read the NET-HOWTO, a 24 recommended to read the NET-HOWTO, available from
25 <http://www.tldp.org/docs.html#howto 25 <http://www.tldp.org/docs.html#howto>.
26 26
27 if NET 27 if NET
28 28
29 config WANT_COMPAT_NETLINK_MESSAGES 29 config WANT_COMPAT_NETLINK_MESSAGES
30 bool 30 bool
31 help 31 help
32 This option can be selected by other 32 This option can be selected by other options that need compat
33 netlink messages. 33 netlink messages.
34 34
35 config COMPAT_NETLINK_MESSAGES 35 config COMPAT_NETLINK_MESSAGES
36 def_bool y 36 def_bool y
37 depends on COMPAT 37 depends on COMPAT
38 depends on WEXT_CORE || WANT_COMPAT_NE 38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
39 help 39 help
40 This option makes it possible to sen 40 This option makes it possible to send different netlink messages
41 to tasks depending on whether the ta 41 to tasks depending on whether the task is a compat task or not. To
42 achieve this, you need to set skb_sh 42 achieve this, you need to set skb_shinfo(skb)->frag_list to the
43 compat skb before sending the skb, t 43 compat skb before sending the skb, the netlink code will sort out
44 which message to actually pass to th 44 which message to actually pass to the task.
45 45
46 Newly written code should NEVER need 46 Newly written code should NEVER need this option but do
47 compat-independent messages instead! 47 compat-independent messages instead!
48 48
49 config NET_INGRESS 49 config NET_INGRESS
50 bool 50 bool
51 51
52 config NET_EGRESS 52 config NET_EGRESS
53 bool 53 bool
54 54
55 config NET_XGRESS 55 config NET_XGRESS
56 select NET_INGRESS 56 select NET_INGRESS
57 select NET_EGRESS 57 select NET_EGRESS
58 bool 58 bool
59 59
60 config NET_REDIRECT 60 config NET_REDIRECT
61 bool 61 bool
62 62
63 config SKB_DECRYPTED 63 config SKB_DECRYPTED
64 bool 64 bool
65 65
66 config SKB_EXTENSIONS 66 config SKB_EXTENSIONS
67 bool 67 bool
68 68
69 config NET_DEVMEM <<
70 def_bool y <<
71 depends on DMA_SHARED_BUFFER <<
72 depends on GENERIC_ALLOCATOR <<
73 depends on PAGE_POOL <<
74 <<
75 menu "Networking options" 69 menu "Networking options"
76 70
77 source "net/packet/Kconfig" 71 source "net/packet/Kconfig"
78 source "net/unix/Kconfig" 72 source "net/unix/Kconfig"
79 source "net/tls/Kconfig" 73 source "net/tls/Kconfig"
80 source "net/xfrm/Kconfig" 74 source "net/xfrm/Kconfig"
81 source "net/iucv/Kconfig" 75 source "net/iucv/Kconfig"
82 source "net/smc/Kconfig" 76 source "net/smc/Kconfig"
83 source "net/xdp/Kconfig" 77 source "net/xdp/Kconfig"
84 78
85 config NET_HANDSHAKE 79 config NET_HANDSHAKE
86 bool 80 bool
87 depends on SUNRPC || NVME_TARGET_TCP | 81 depends on SUNRPC || NVME_TARGET_TCP || NVME_TCP
88 default y 82 default y
89 83
90 config NET_HANDSHAKE_KUNIT_TEST 84 config NET_HANDSHAKE_KUNIT_TEST
91 tristate "KUnit tests for the handshak 85 tristate "KUnit tests for the handshake upcall mechanism" if !KUNIT_ALL_TESTS
92 default KUNIT_ALL_TESTS 86 default KUNIT_ALL_TESTS
93 depends on KUNIT 87 depends on KUNIT
94 help 88 help
95 This builds the KUnit tests for the 89 This builds the KUnit tests for the handshake upcall mechanism.
96 90
97 KUnit tests run during boot and outp 91 KUnit tests run during boot and output the results to the debug
98 log in TAP format (https://testanyth 92 log in TAP format (https://testanything.org/). Only useful for
99 kernel devs running KUnit test harne 93 kernel devs running KUnit test harness and are not for inclusion
100 into a production build. 94 into a production build.
101 95
102 For more information on KUnit and un 96 For more information on KUnit and unit tests in general, refer
103 to the KUnit documentation in Docume 97 to the KUnit documentation in Documentation/dev-tools/kunit/.
104 98
105 config INET 99 config INET
106 bool "TCP/IP networking" 100 bool "TCP/IP networking"
107 help 101 help
108 These are the protocols used on the 102 These are the protocols used on the Internet and on most local
109 Ethernets. It is highly recommended 103 Ethernets. It is highly recommended to say Y here (this will enlarge
110 your kernel by about 400 KB), since 104 your kernel by about 400 KB), since some programs (e.g. the X window
111 system) use TCP/IP even if your mach 105 system) use TCP/IP even if your machine is not connected to any
112 other computer. You will get the so- 106 other computer. You will get the so-called loopback device which
113 allows you to ping yourself (great f 107 allows you to ping yourself (great fun, that!).
114 108
115 For an excellent introduction to Lin 109 For an excellent introduction to Linux networking, please read the
116 Linux Networking HOWTO, available fr 110 Linux Networking HOWTO, available from
117 <http://www.tldp.org/docs.html#howto 111 <http://www.tldp.org/docs.html#howto>.
118 112
119 If you say Y here and also to "/proc 113 If you say Y here and also to "/proc file system support" and
120 "Sysctl support" below, you can chan 114 "Sysctl support" below, you can change various aspects of the
121 behavior of the TCP/IP code by writi 115 behavior of the TCP/IP code by writing to the (virtual) files in
122 /proc/sys/net/ipv4/*; the options ar 116 /proc/sys/net/ipv4/*; the options are explained in the file
123 <file:Documentation/networking/ip-sy 117 <file:Documentation/networking/ip-sysctl.rst>.
124 118
125 Short answer: say Y. 119 Short answer: say Y.
126 120
127 if INET 121 if INET
128 source "net/ipv4/Kconfig" 122 source "net/ipv4/Kconfig"
129 source "net/ipv6/Kconfig" 123 source "net/ipv6/Kconfig"
130 source "net/netlabel/Kconfig" 124 source "net/netlabel/Kconfig"
131 source "net/mptcp/Kconfig" 125 source "net/mptcp/Kconfig"
132 126
133 endif # if INET 127 endif # if INET
134 128
135 config NETWORK_SECMARK 129 config NETWORK_SECMARK
136 bool "Security Marking" 130 bool "Security Marking"
137 help 131 help
138 This enables security marking of net 132 This enables security marking of network packets, similar
139 to nfmark, but designated for securi 133 to nfmark, but designated for security purposes.
140 If you are unsure how to answer this 134 If you are unsure how to answer this question, answer N.
141 135
142 config NET_PTP_CLASSIFY 136 config NET_PTP_CLASSIFY
143 def_bool n 137 def_bool n
144 138
145 config NETWORK_PHY_TIMESTAMPING 139 config NETWORK_PHY_TIMESTAMPING
146 bool "Timestamping in PHY devices" 140 bool "Timestamping in PHY devices"
147 select NET_PTP_CLASSIFY 141 select NET_PTP_CLASSIFY
148 help 142 help
149 This allows timestamping of network 143 This allows timestamping of network packets by PHYs (or
150 other MII bus snooping devices) with 144 other MII bus snooping devices) with hardware timestamping
151 capabilities. This option adds some 145 capabilities. This option adds some overhead in the transmit
152 and receive paths. 146 and receive paths.
153 147
154 If you are unsure how to answer this 148 If you are unsure how to answer this question, answer N.
155 149
156 menuconfig NETFILTER 150 menuconfig NETFILTER
157 bool "Network packet filtering framewo 151 bool "Network packet filtering framework (Netfilter)"
158 help 152 help
159 Netfilter is a framework for filteri 153 Netfilter is a framework for filtering and mangling network packets
160 that pass through your Linux box. 154 that pass through your Linux box.
161 155
162 The most common use of packet filter 156 The most common use of packet filtering is to run your Linux box as
163 a firewall protecting a local networ 157 a firewall protecting a local network from the Internet. The type of
164 firewall provided by this kernel sup 158 firewall provided by this kernel support is called a "packet
165 filter", which means that it can rej 159 filter", which means that it can reject individual network packets
166 based on type, source, destination e 160 based on type, source, destination etc. The other kind of firewall,
167 a "proxy-based" one, is more secure 161 a "proxy-based" one, is more secure but more intrusive and more
168 bothersome to set up; it inspects th 162 bothersome to set up; it inspects the network traffic much more
169 closely, modifies it and has knowled 163 closely, modifies it and has knowledge about the higher level
170 protocols, which a packet filter lac 164 protocols, which a packet filter lacks. Moreover, proxy-based
171 firewalls often require changes to t 165 firewalls often require changes to the programs running on the local
172 clients. Proxy-based firewalls don't 166 clients. Proxy-based firewalls don't need support by the kernel, but
173 they are often combined with a packe 167 they are often combined with a packet filter, which only works if
174 you say Y here. 168 you say Y here.
175 169
176 You should also say Y here if you in 170 You should also say Y here if you intend to use your Linux box as
177 the gateway to the Internet for a lo 171 the gateway to the Internet for a local network of machines without
178 globally valid IP addresses. This is 172 globally valid IP addresses. This is called "masquerading": if one
179 of the computers on your local netwo 173 of the computers on your local network wants to send something to
180 the outside, your box can "masquerad 174 the outside, your box can "masquerade" as that computer, i.e. it
181 forwards the traffic to the intended 175 forwards the traffic to the intended outside destination, but
182 modifies the packets to make it look 176 modifies the packets to make it look like they came from the
183 firewall box itself. It works both w 177 firewall box itself. It works both ways: if the outside host
184 replies, the Linux box will silently 178 replies, the Linux box will silently forward the traffic to the
185 correct local computer. This way, th 179 correct local computer. This way, the computers on your local net
186 are completely invisible to the outs 180 are completely invisible to the outside world, even though they can
187 reach the outside and can receive re 181 reach the outside and can receive replies. It is even possible to
188 run globally visible servers from wi 182 run globally visible servers from within a masqueraded local network
189 using a mechanism called portforward 183 using a mechanism called portforwarding. Masquerading is also often
190 called NAT (Network Address Translat 184 called NAT (Network Address Translation).
191 185
192 Another use of Netfilter is in trans 186 Another use of Netfilter is in transparent proxying: if a machine on
193 the local network tries to connect t 187 the local network tries to connect to an outside host, your Linux
194 box can transparently forward the tr 188 box can transparently forward the traffic to a local server,
195 typically a caching proxy server. 189 typically a caching proxy server.
196 190
197 Yet another use of Netfilter is buil 191 Yet another use of Netfilter is building a bridging firewall. Using
198 a bridge with Network packet filteri 192 a bridge with Network packet filtering enabled makes iptables "see"
199 the bridged traffic. For filtering o 193 the bridged traffic. For filtering on the lower network and Ethernet
200 protocols over the bridge, use ebtab 194 protocols over the bridge, use ebtables (under bridge netfilter
201 configuration). 195 configuration).
202 196
203 Various modules exist for netfilter 197 Various modules exist for netfilter which replace the previous
204 masquerading (ipmasqadm), packet fil 198 masquerading (ipmasqadm), packet filtering (ipchains), transparent
205 proxying, and portforwarding mechani 199 proxying, and portforwarding mechanisms. Please see
206 <file:Documentation/Changes> under " 200 <file:Documentation/Changes> under "iptables" for the location of
207 these packages. 201 these packages.
208 202
209 if NETFILTER 203 if NETFILTER
210 204
211 config NETFILTER_ADVANCED 205 config NETFILTER_ADVANCED
212 bool "Advanced netfilter configuration 206 bool "Advanced netfilter configuration"
213 depends on NETFILTER 207 depends on NETFILTER
214 default y 208 default y
215 help 209 help
216 If you say Y here you can select bet 210 If you say Y here you can select between all the netfilter modules.
217 If you say N the more unusual ones w 211 If you say N the more unusual ones will not be shown and the
218 basic ones needed by most people wil 212 basic ones needed by most people will default to 'M'.
219 213
220 If unsure, say Y. 214 If unsure, say Y.
221 215
222 config BRIDGE_NETFILTER 216 config BRIDGE_NETFILTER
223 tristate "Bridged IP/ARP packets filte 217 tristate "Bridged IP/ARP packets filtering"
224 depends on BRIDGE 218 depends on BRIDGE
225 depends on NETFILTER && INET 219 depends on NETFILTER && INET
226 depends on NETFILTER_ADVANCED 220 depends on NETFILTER_ADVANCED
227 select NETFILTER_FAMILY_BRIDGE 221 select NETFILTER_FAMILY_BRIDGE
228 select SKB_EXTENSIONS 222 select SKB_EXTENSIONS
229 help 223 help
230 Enabling this option will let arptab 224 Enabling this option will let arptables resp. iptables see bridged
231 ARP resp. IP traffic. If you want a 225 ARP resp. IP traffic. If you want a bridging firewall, you probably
232 want this option enabled. 226 want this option enabled.
233 Enabling or disabling this option do 227 Enabling or disabling this option doesn't enable or disable
234 ebtables. 228 ebtables.
235 229
236 If unsure, say N. 230 If unsure, say N.
237 231
238 source "net/netfilter/Kconfig" 232 source "net/netfilter/Kconfig"
239 source "net/ipv4/netfilter/Kconfig" 233 source "net/ipv4/netfilter/Kconfig"
240 source "net/ipv6/netfilter/Kconfig" 234 source "net/ipv6/netfilter/Kconfig"
241 source "net/bridge/netfilter/Kconfig" 235 source "net/bridge/netfilter/Kconfig"
242 236
243 endif 237 endif
244 238
245 source "net/dccp/Kconfig" 239 source "net/dccp/Kconfig"
246 source "net/sctp/Kconfig" 240 source "net/sctp/Kconfig"
247 source "net/rds/Kconfig" 241 source "net/rds/Kconfig"
248 source "net/tipc/Kconfig" 242 source "net/tipc/Kconfig"
249 source "net/atm/Kconfig" 243 source "net/atm/Kconfig"
250 source "net/l2tp/Kconfig" 244 source "net/l2tp/Kconfig"
251 source "net/802/Kconfig" 245 source "net/802/Kconfig"
252 source "net/bridge/Kconfig" 246 source "net/bridge/Kconfig"
253 source "net/dsa/Kconfig" 247 source "net/dsa/Kconfig"
254 source "net/8021q/Kconfig" 248 source "net/8021q/Kconfig"
255 source "net/llc/Kconfig" 249 source "net/llc/Kconfig"
256 source "net/appletalk/Kconfig" 250 source "net/appletalk/Kconfig"
257 source "net/x25/Kconfig" 251 source "net/x25/Kconfig"
258 source "net/lapb/Kconfig" 252 source "net/lapb/Kconfig"
259 source "net/phonet/Kconfig" 253 source "net/phonet/Kconfig"
260 source "net/6lowpan/Kconfig" 254 source "net/6lowpan/Kconfig"
261 source "net/ieee802154/Kconfig" 255 source "net/ieee802154/Kconfig"
262 source "net/mac802154/Kconfig" 256 source "net/mac802154/Kconfig"
263 source "net/sched/Kconfig" 257 source "net/sched/Kconfig"
264 source "net/dcb/Kconfig" 258 source "net/dcb/Kconfig"
265 source "net/dns_resolver/Kconfig" 259 source "net/dns_resolver/Kconfig"
266 source "net/batman-adv/Kconfig" 260 source "net/batman-adv/Kconfig"
267 source "net/openvswitch/Kconfig" 261 source "net/openvswitch/Kconfig"
268 source "net/vmw_vsock/Kconfig" 262 source "net/vmw_vsock/Kconfig"
269 source "net/netlink/Kconfig" 263 source "net/netlink/Kconfig"
270 source "net/mpls/Kconfig" 264 source "net/mpls/Kconfig"
271 source "net/nsh/Kconfig" 265 source "net/nsh/Kconfig"
272 source "net/hsr/Kconfig" 266 source "net/hsr/Kconfig"
273 source "net/switchdev/Kconfig" 267 source "net/switchdev/Kconfig"
274 source "net/l3mdev/Kconfig" 268 source "net/l3mdev/Kconfig"
275 source "net/qrtr/Kconfig" 269 source "net/qrtr/Kconfig"
276 source "net/ncsi/Kconfig" 270 source "net/ncsi/Kconfig"
277 271
278 config PCPU_DEV_REFCNT 272 config PCPU_DEV_REFCNT
279 bool "Use percpu variables to maintain 273 bool "Use percpu variables to maintain network device refcount"
280 depends on SMP 274 depends on SMP
281 default y 275 default y
282 help 276 help
283 network device refcount are using pe 277 network device refcount are using per cpu variables if this option is set.
284 This can be forced to N to detect un 278 This can be forced to N to detect underflows (with a performance drop).
285 279
286 config MAX_SKB_FRAGS 280 config MAX_SKB_FRAGS
287 int "Maximum number of fragments per s 281 int "Maximum number of fragments per skb_shared_info"
288 range 17 45 282 range 17 45
289 default 17 283 default 17
290 help 284 help
291 Having more fragments per skb_shared 285 Having more fragments per skb_shared_info can help GRO efficiency.
292 This helps BIG TCP workloads, but mi 286 This helps BIG TCP workloads, but might expose bugs in some
293 legacy drivers. 287 legacy drivers.
294 This also increases memory overhead 288 This also increases memory overhead of small packets,
295 and in drivers using build_skb(). 289 and in drivers using build_skb().
296 If unsure, say 17. 290 If unsure, say 17.
297 291
298 config RPS 292 config RPS
299 bool "Receive packet steering" 293 bool "Receive packet steering"
300 depends on SMP && SYSFS 294 depends on SMP && SYSFS
301 default y 295 default y
302 help 296 help
303 Software receive side packet steerin 297 Software receive side packet steering (RPS) distributes the
304 load of received packet processing a 298 load of received packet processing across multiple CPUs.
305 299
306 config RFS_ACCEL 300 config RFS_ACCEL
307 bool "Hardware acceleration of RFS" 301 bool "Hardware acceleration of RFS"
308 depends on RPS 302 depends on RPS
309 select CPU_RMAP 303 select CPU_RMAP
310 default y 304 default y
311 help 305 help
312 Allowing drivers for multiqueue hard 306 Allowing drivers for multiqueue hardware with flow filter tables to
313 accelerate RFS. 307 accelerate RFS.
314 308
315 config SOCK_RX_QUEUE_MAPPING 309 config SOCK_RX_QUEUE_MAPPING
316 bool 310 bool
317 311
318 config XPS 312 config XPS
319 bool 313 bool
320 depends on SMP 314 depends on SMP
321 select SOCK_RX_QUEUE_MAPPING 315 select SOCK_RX_QUEUE_MAPPING
322 default y 316 default y
323 317
324 config HWBM 318 config HWBM
325 bool 319 bool
326 320
327 config CGROUP_NET_PRIO 321 config CGROUP_NET_PRIO
328 bool "Network priority cgroup" 322 bool "Network priority cgroup"
329 depends on CGROUPS 323 depends on CGROUPS
330 select SOCK_CGROUP_DATA 324 select SOCK_CGROUP_DATA
331 help 325 help
332 Cgroup subsystem for use in assignin 326 Cgroup subsystem for use in assigning processes to network priorities on
333 a per-interface basis. 327 a per-interface basis.
334 328
335 config CGROUP_NET_CLASSID 329 config CGROUP_NET_CLASSID
336 bool "Network classid cgroup" 330 bool "Network classid cgroup"
337 depends on CGROUPS 331 depends on CGROUPS
338 select SOCK_CGROUP_DATA 332 select SOCK_CGROUP_DATA
339 help 333 help
340 Cgroup subsystem for use as general 334 Cgroup subsystem for use as general purpose socket classid marker that is
341 being used in cls_cgroup and for net 335 being used in cls_cgroup and for netfilter matching.
342 336
343 config NET_RX_BUSY_POLL 337 config NET_RX_BUSY_POLL
344 bool 338 bool
345 default y if !PREEMPT_RT || (PREEMPT_R 339 default y if !PREEMPT_RT || (PREEMPT_RT && !NETCONSOLE)
346 340
347 config BQL 341 config BQL
348 bool 342 bool
349 prompt "Enable Byte Queue Limits" 343 prompt "Enable Byte Queue Limits"
350 depends on SYSFS 344 depends on SYSFS
351 select DQL 345 select DQL
352 default y 346 default y
353 347
354 config BPF_STREAM_PARSER 348 config BPF_STREAM_PARSER
355 bool "enable BPF STREAM_PARSER" 349 bool "enable BPF STREAM_PARSER"
356 depends on INET 350 depends on INET
357 depends on BPF_SYSCALL 351 depends on BPF_SYSCALL
358 depends on CGROUP_BPF 352 depends on CGROUP_BPF
359 select STREAM_PARSER 353 select STREAM_PARSER
360 select NET_SOCK_MSG 354 select NET_SOCK_MSG
361 help 355 help
362 Enabling this allows a TCP stream pa 356 Enabling this allows a TCP stream parser to be used with
363 BPF_MAP_TYPE_SOCKMAP. 357 BPF_MAP_TYPE_SOCKMAP.
364 358
365 config NET_FLOW_LIMIT 359 config NET_FLOW_LIMIT
366 bool "Net flow limit" 360 bool "Net flow limit"
367 depends on RPS 361 depends on RPS
368 default y 362 default y
369 help 363 help
370 The network stack has to drop packet 364 The network stack has to drop packets when a receive processing CPU's
371 backlog reaches netdev_max_backlog. 365 backlog reaches netdev_max_backlog. If a few out of many active flows
372 generate the vast majority of load, 366 generate the vast majority of load, drop their traffic earlier to
373 maintain capacity for the other flow 367 maintain capacity for the other flows. This feature provides servers
374 with many clients some protection ag 368 with many clients some protection against DoS by a single (spoofed)
375 flow that greatly exceeds average wo 369 flow that greatly exceeds average workload.
376 370
377 menu "Network testing" 371 menu "Network testing"
378 372
379 config NET_PKTGEN 373 config NET_PKTGEN
380 tristate "Packet Generator (USE WITH C 374 tristate "Packet Generator (USE WITH CAUTION)"
381 depends on INET && PROC_FS 375 depends on INET && PROC_FS
382 help 376 help
383 This module will inject preconfigure 377 This module will inject preconfigured packets, at a configurable
384 rate, out of a given interface. It 378 rate, out of a given interface. It is used for network interface
385 stress testing and performance analy 379 stress testing and performance analysis. If you don't understand
386 what was just said, you don't need i 380 what was just said, you don't need it: say N.
387 381
388 Documentation on how to use the pack 382 Documentation on how to use the packet generator can be found
389 at <file:Documentation/networking/pk 383 at <file:Documentation/networking/pktgen.rst>.
390 384
391 To compile this code as a module, ch 385 To compile this code as a module, choose M here: the
392 module will be called pktgen. 386 module will be called pktgen.
393 387
394 config NET_DROP_MONITOR 388 config NET_DROP_MONITOR
395 tristate "Network packet drop alerting 389 tristate "Network packet drop alerting service"
396 depends on INET && TRACEPOINTS 390 depends on INET && TRACEPOINTS
397 help 391 help
398 This feature provides an alerting se 392 This feature provides an alerting service to userspace in the
399 event that packets are discarded in 393 event that packets are discarded in the network stack. Alerts
400 are broadcast via netlink socket to 394 are broadcast via netlink socket to any listening user space
401 process. If you don't need network 395 process. If you don't need network drop alerts, or if you are ok
402 just checking the various proc files 396 just checking the various proc files and other utilities for
403 drop statistics, say N here. 397 drop statistics, say N here.
404 398
405 endmenu 399 endmenu
406 400
407 endmenu 401 endmenu
408 402
409 source "net/ax25/Kconfig" 403 source "net/ax25/Kconfig"
410 source "net/can/Kconfig" 404 source "net/can/Kconfig"
411 source "net/bluetooth/Kconfig" 405 source "net/bluetooth/Kconfig"
412 source "net/rxrpc/Kconfig" 406 source "net/rxrpc/Kconfig"
413 source "net/kcm/Kconfig" 407 source "net/kcm/Kconfig"
414 source "net/strparser/Kconfig" 408 source "net/strparser/Kconfig"
415 source "net/mctp/Kconfig" 409 source "net/mctp/Kconfig"
416 410
417 config FIB_RULES 411 config FIB_RULES
418 bool 412 bool
419 413
420 menuconfig WIRELESS 414 menuconfig WIRELESS
421 bool "Wireless" 415 bool "Wireless"
422 depends on !S390 416 depends on !S390
423 default y 417 default y
424 418
425 if WIRELESS 419 if WIRELESS
426 420
427 source "net/wireless/Kconfig" 421 source "net/wireless/Kconfig"
428 source "net/mac80211/Kconfig" 422 source "net/mac80211/Kconfig"
429 423
430 endif # WIRELESS 424 endif # WIRELESS
431 425
432 source "net/rfkill/Kconfig" 426 source "net/rfkill/Kconfig"
433 source "net/9p/Kconfig" 427 source "net/9p/Kconfig"
434 source "net/caif/Kconfig" 428 source "net/caif/Kconfig"
435 source "net/ceph/Kconfig" 429 source "net/ceph/Kconfig"
436 source "net/nfc/Kconfig" 430 source "net/nfc/Kconfig"
437 source "net/psample/Kconfig" 431 source "net/psample/Kconfig"
438 source "net/ife/Kconfig" 432 source "net/ife/Kconfig"
439 433
440 config LWTUNNEL 434 config LWTUNNEL
441 bool "Network light weight tunnels" 435 bool "Network light weight tunnels"
442 help 436 help
443 This feature provides an infrastruct 437 This feature provides an infrastructure to support light weight
444 tunnels like mpls. There is no netde 438 tunnels like mpls. There is no netdevice associated with a light
445 weight tunnel endpoint. Tunnel encap 439 weight tunnel endpoint. Tunnel encapsulation parameters are stored
446 with light weight tunnel state assoc 440 with light weight tunnel state associated with fib routes.
447 441
448 config LWTUNNEL_BPF 442 config LWTUNNEL_BPF
449 bool "Execute BPF program as route nex 443 bool "Execute BPF program as route nexthop action"
450 depends on LWTUNNEL && INET 444 depends on LWTUNNEL && INET
451 default y if LWTUNNEL=y 445 default y if LWTUNNEL=y
452 help 446 help
453 Allows to run BPF programs as a next 447 Allows to run BPF programs as a nexthop action following a route
454 lookup for incoming and outgoing pac 448 lookup for incoming and outgoing packets.
455 449
456 config DST_CACHE 450 config DST_CACHE
457 bool 451 bool
458 default n 452 default n
459 453
460 config GRO_CELLS 454 config GRO_CELLS
461 bool 455 bool
462 default n 456 default n
463 457
464 config SOCK_VALIDATE_XMIT 458 config SOCK_VALIDATE_XMIT
465 bool 459 bool
466 460
467 config NET_IEEE8021Q_HELPERS 461 config NET_IEEE8021Q_HELPERS
468 bool 462 bool
469 463
470 config NET_SELFTESTS 464 config NET_SELFTESTS
471 def_tristate PHYLIB 465 def_tristate PHYLIB
472 depends on PHYLIB && INET 466 depends on PHYLIB && INET
473 467
474 config NET_SOCK_MSG 468 config NET_SOCK_MSG
475 bool 469 bool
476 default n 470 default n
477 help 471 help
478 The NET_SOCK_MSG provides a framewor 472 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
479 ULPs (upper layer modules, e.g. TLS) 473 ULPs (upper layer modules, e.g. TLS) to process L7 application data
480 with the help of BPF programs. 474 with the help of BPF programs.
481 475
482 config NET_DEVLINK 476 config NET_DEVLINK
483 bool 477 bool
484 default n 478 default n
485 479
486 config PAGE_POOL 480 config PAGE_POOL
487 bool 481 bool
488 482
489 config PAGE_POOL_STATS 483 config PAGE_POOL_STATS
490 default n 484 default n
491 bool "Page pool stats" 485 bool "Page pool stats"
492 depends on PAGE_POOL 486 depends on PAGE_POOL
493 help 487 help
494 Enable page pool statistics to track 488 Enable page pool statistics to track page allocation and recycling
495 in page pools. This option incurs ad 489 in page pools. This option incurs additional CPU cost in allocation
496 and recycle paths and additional mem 490 and recycle paths and additional memory cost to store the statistics.
497 These statistics are only available 491 These statistics are only available if this option is enabled and if
498 the driver using the page pool suppo 492 the driver using the page pool supports exporting this data.
499 493
500 If unsure, say N. 494 If unsure, say N.
501 495
502 config FAILOVER 496 config FAILOVER
503 tristate "Generic failover module" 497 tristate "Generic failover module"
504 help 498 help
505 The failover module provides a gener 499 The failover module provides a generic interface for paravirtual
506 drivers to register a netdev and a s 500 drivers to register a netdev and a set of ops with a failover
507 instance. The ops are used as event 501 instance. The ops are used as event handlers that get called to
508 handle netdev register/unregister/li 502 handle netdev register/unregister/link change/name change events
509 on slave pci ethernet devices with t 503 on slave pci ethernet devices with the same mac address as the
510 failover netdev. This enables paravi 504 failover netdev. This enables paravirtual drivers to use a
511 VF as an accelerated low latency dat 505 VF as an accelerated low latency datapath. It also allows live
512 migration of VMs with direct attache 506 migration of VMs with direct attached VFs by failing over to the
513 paravirtual datapath when the VF is 507 paravirtual datapath when the VF is unplugged.
514 508
515 config ETHTOOL_NETLINK 509 config ETHTOOL_NETLINK
516 bool "Netlink interface for ethtool" 510 bool "Netlink interface for ethtool"
517 select DIMLIB 511 select DIMLIB
518 default y 512 default y
519 help 513 help
520 An alternative userspace interface f 514 An alternative userspace interface for ethtool based on generic
521 netlink. It provides better extensib 515 netlink. It provides better extensibility and some new features,
522 e.g. notification messages. 516 e.g. notification messages.
523 517
524 config NETDEV_ADDR_LIST_TEST 518 config NETDEV_ADDR_LIST_TEST
525 tristate "Unit tests for device addres 519 tristate "Unit tests for device address list"
526 default KUNIT_ALL_TESTS 520 default KUNIT_ALL_TESTS
527 depends on KUNIT 521 depends on KUNIT
528 522
529 config NET_TEST 523 config NET_TEST
530 tristate "KUnit tests for networking" 524 tristate "KUnit tests for networking" if !KUNIT_ALL_TESTS
531 depends on KUNIT 525 depends on KUNIT
532 default KUNIT_ALL_TESTS 526 default KUNIT_ALL_TESTS
533 help 527 help
534 KUnit tests covering core networking 528 KUnit tests covering core networking infra, such as sk_buff.
535 529
536 If unsure, say N. 530 If unsure, say N.
537 531
538 endif # if NET 532 endif # if NET
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