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