1
2
3
4
5
6menuconfig NET
7 bool "Networking support"
8 select NLATTR
9 select GENERIC_NET_UTILS
10 select BPF
11 help
12 Unless you really know what you are doing, you should say Y here.
13 The reason is that some programs need kernel networking support even
14 when running on a stand-alone machine that isn't connected to any
15 other computer.
16
17 If you are upgrading from an older kernel, you
18 should consider updating your networking tools too because changes
19 in the kernel and the tools often go hand in hand. The tools are
20 contained in the package net-tools, the location and version number
21 of which are given in <file:Documentation/Changes>.
22
23 For a general introduction to Linux networking, it is highly
24 recommended to read the NET-HOWTO, available from
25 <http://www.tldp.org/docs.html#howto>.
26
27if NET
28
29config WANT_COMPAT_NETLINK_MESSAGES
30 bool
31 help
32 This option can be selected by other options that need compat
33 netlink messages.
34
35config COMPAT_NETLINK_MESSAGES
36 def_bool y
37 depends on COMPAT
38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
39 help
40 This option makes it possible to send different netlink messages
41 to tasks depending on whether the task is a compat task or not. To
42 achieve this, you need to set skb_shinfo(skb)->frag_list to the
43 compat skb before sending the skb, the netlink code will sort out
44 which message to actually pass to the task.
45
46 Newly written code should NEVER need this option but do
47 compat-independent messages instead!
48
49config NET_INGRESS
50 bool
51
52config NET_EGRESS
53 bool
54
55config NET_REDIRECT
56 bool
57
58config SKB_EXTENSIONS
59 bool
60
61menu "Networking options"
62
63source "net/packet/Kconfig"
64source "net/unix/Kconfig"
65source "net/tls/Kconfig"
66source "net/xfrm/Kconfig"
67source "net/iucv/Kconfig"
68source "net/smc/Kconfig"
69source "net/xdp/Kconfig"
70
71config INET
72 bool "TCP/IP networking"
73 help
74 These are the protocols used on the Internet and on most local
75 Ethernets. It is highly recommended to say Y here (this will enlarge
76 your kernel by about 400 KB), since some programs (e.g. the X window
77 system) use TCP/IP even if your machine is not connected to any
78 other computer. You will get the so-called loopback device which
79 allows you to ping yourself (great fun, that!).
80
81 For an excellent introduction to Linux networking, please read the
82 Linux Networking HOWTO, available from
83 <http://www.tldp.org/docs.html#howto>.
84
85 If you say Y here and also to "/proc file system support" and
86 "Sysctl support" below, you can change various aspects of the
87 behavior of the TCP/IP code by writing to the (virtual) files in
88 /proc/sys/net/ipv4/*; the options are explained in the file
89 <file:Documentation/networking/ip-sysctl.rst>.
90
91 Short answer: say Y.
92
93if INET
94source "net/ipv4/Kconfig"
95source "net/ipv6/Kconfig"
96source "net/netlabel/Kconfig"
97source "net/mptcp/Kconfig"
98
99endif
100
101config NETWORK_SECMARK
102 bool "Security Marking"
103 help
104 This enables security marking of network packets, similar
105 to nfmark, but designated for security purposes.
106 If you are unsure how to answer this question, answer N.
107
108config NET_PTP_CLASSIFY
109 def_bool n
110
111config NETWORK_PHY_TIMESTAMPING
112 bool "Timestamping in PHY devices"
113 select NET_PTP_CLASSIFY
114 help
115 This allows timestamping of network packets by PHYs (or
116 other MII bus snooping devices) with hardware timestamping
117 capabilities. This option adds some overhead in the transmit
118 and receive paths.
119
120 If you are unsure how to answer this question, answer N.
121
122menuconfig NETFILTER
123 bool "Network packet filtering framework (Netfilter)"
124 help
125 Netfilter is a framework for filtering and mangling network packets
126 that pass through your Linux box.
127
128 The most common use of packet filtering is to run your Linux box as
129 a firewall protecting a local network from the Internet. The type of
130 firewall provided by this kernel support is called a "packet
131 filter", which means that it can reject individual network packets
132 based on type, source, destination etc. The other kind of firewall,
133 a "proxy-based" one, is more secure but more intrusive and more
134 bothersome to set up; it inspects the network traffic much more
135 closely, modifies it and has knowledge about the higher level
136 protocols, which a packet filter lacks. Moreover, proxy-based
137 firewalls often require changes to the programs running on the local
138 clients. Proxy-based firewalls don't need support by the kernel, but
139 they are often combined with a packet filter, which only works if
140 you say Y here.
141
142 You should also say Y here if you intend to use your Linux box as
143 the gateway to the Internet for a local network of machines without
144 globally valid IP addresses. This is called "masquerading": if one
145 of the computers on your local network wants to send something to
146 the outside, your box can "masquerade" as that computer, i.e. it
147 forwards the traffic to the intended outside destination, but
148 modifies the packets to make it look like they came from the
149 firewall box itself. It works both ways: if the outside host
150 replies, the Linux box will silently forward the traffic to the
151 correct local computer. This way, the computers on your local net
152 are completely invisible to the outside world, even though they can
153 reach the outside and can receive replies. It is even possible to
154 run globally visible servers from within a masqueraded local network
155 using a mechanism called portforwarding. Masquerading is also often
156 called NAT (Network Address Translation).
157
158 Another use of Netfilter is in transparent proxying: if a machine on
159 the local network tries to connect to an outside host, your Linux
160 box can transparently forward the traffic to a local server,
161 typically a caching proxy server.
162
163 Yet another use of Netfilter is building a bridging firewall. Using
164 a bridge with Network packet filtering enabled makes iptables "see"
165 the bridged traffic. For filtering on the lower network and Ethernet
166 protocols over the bridge, use ebtables (under bridge netfilter
167 configuration).
168
169 Various modules exist for netfilter which replace the previous
170 masquerading (ipmasqadm), packet filtering (ipchains), transparent
171 proxying, and portforwarding mechanisms. Please see
172 <file:Documentation/Changes> under "iptables" for the location of
173 these packages.
174
175if NETFILTER
176
177config NETFILTER_ADVANCED
178 bool "Advanced netfilter configuration"
179 depends on NETFILTER
180 default y
181 help
182 If you say Y here you can select between all the netfilter modules.
183 If you say N the more unusual ones will not be shown and the
184 basic ones needed by most people will default to 'M'.
185
186 If unsure, say Y.
187
188config BRIDGE_NETFILTER
189 tristate "Bridged IP/ARP packets filtering"
190 depends on BRIDGE
191 depends on NETFILTER && INET
192 depends on NETFILTER_ADVANCED
193 select NETFILTER_FAMILY_BRIDGE
194 select SKB_EXTENSIONS
195 help
196 Enabling this option will let arptables resp. iptables see bridged
197 ARP resp. IP traffic. If you want a bridging firewall, you probably
198 want this option enabled.
199 Enabling or disabling this option doesn't enable or disable
200 ebtables.
201
202 If unsure, say N.
203
204source "net/netfilter/Kconfig"
205source "net/ipv4/netfilter/Kconfig"
206source "net/ipv6/netfilter/Kconfig"
207source "net/decnet/netfilter/Kconfig"
208source "net/bridge/netfilter/Kconfig"
209
210endif
211
212source "net/bpfilter/Kconfig"
213
214source "net/dccp/Kconfig"
215source "net/sctp/Kconfig"
216source "net/rds/Kconfig"
217source "net/tipc/Kconfig"
218source "net/atm/Kconfig"
219source "net/l2tp/Kconfig"
220source "net/802/Kconfig"
221source "net/bridge/Kconfig"
222source "net/dsa/Kconfig"
223source "net/8021q/Kconfig"
224source "net/decnet/Kconfig"
225source "net/llc/Kconfig"
226source "drivers/net/appletalk/Kconfig"
227source "net/x25/Kconfig"
228source "net/lapb/Kconfig"
229source "net/phonet/Kconfig"
230source "net/6lowpan/Kconfig"
231source "net/ieee802154/Kconfig"
232source "net/mac802154/Kconfig"
233source "net/sched/Kconfig"
234source "net/dcb/Kconfig"
235source "net/dns_resolver/Kconfig"
236source "net/batman-adv/Kconfig"
237source "net/openvswitch/Kconfig"
238source "net/vmw_vsock/Kconfig"
239source "net/netlink/Kconfig"
240source "net/mpls/Kconfig"
241source "net/nsh/Kconfig"
242source "net/hsr/Kconfig"
243source "net/switchdev/Kconfig"
244source "net/l3mdev/Kconfig"
245source "net/qrtr/Kconfig"
246source "net/ncsi/Kconfig"
247
248config RPS
249 bool
250 depends on SMP && SYSFS
251 default y
252
253config RFS_ACCEL
254 bool
255 depends on RPS
256 select CPU_RMAP
257 default y
258
259config XPS
260 bool
261 depends on SMP
262 default y
263
264config HWBM
265 bool
266
267config CGROUP_NET_PRIO
268 bool "Network priority cgroup"
269 depends on CGROUPS
270 select SOCK_CGROUP_DATA
271 help
272 Cgroup subsystem for use in assigning processes to network priorities on
273 a per-interface basis.
274
275config CGROUP_NET_CLASSID
276 bool "Network classid cgroup"
277 depends on CGROUPS
278 select SOCK_CGROUP_DATA
279 help
280 Cgroup subsystem for use as general purpose socket classid marker that is
281 being used in cls_cgroup and for netfilter matching.
282
283config NET_RX_BUSY_POLL
284 bool
285 default y
286
287config BQL
288 bool
289 depends on SYSFS
290 select DQL
291 default y
292
293config BPF_JIT
294 bool "enable BPF Just In Time compiler"
295 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
296 depends on MODULES
297 help
298 Berkeley Packet Filter filtering capabilities are normally handled
299 by an interpreter. This option allows kernel to generate a native
300 code when filter is loaded in memory. This should speedup
301 packet sniffing (libpcap/tcpdump).
302
303 Note, admin should enable this feature changing:
304 /proc/sys/net/core/bpf_jit_enable
305 /proc/sys/net/core/bpf_jit_harden (optional)
306 /proc/sys/net/core/bpf_jit_kallsyms (optional)
307
308config BPF_STREAM_PARSER
309 bool "enable BPF STREAM_PARSER"
310 depends on INET
311 depends on BPF_SYSCALL
312 depends on CGROUP_BPF
313 select STREAM_PARSER
314 select NET_SOCK_MSG
315 help
316 Enabling this allows a stream parser to be used with
317 BPF_MAP_TYPE_SOCKMAP.
318
319 BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
320 It can be used to enforce socket policy, implement socket redirects,
321 etc.
322
323config NET_FLOW_LIMIT
324 bool
325 depends on RPS
326 default y
327 help
328 The network stack has to drop packets when a receive processing CPU's
329 backlog reaches netdev_max_backlog. If a few out of many active flows
330 generate the vast majority of load, drop their traffic earlier to
331 maintain capacity for the other flows. This feature provides servers
332 with many clients some protection against DoS by a single (spoofed)
333 flow that greatly exceeds average workload.
334
335menu "Network testing"
336
337config NET_PKTGEN
338 tristate "Packet Generator (USE WITH CAUTION)"
339 depends on INET && PROC_FS
340 help
341 This module will inject preconfigured packets, at a configurable
342 rate, out of a given interface. It is used for network interface
343 stress testing and performance analysis. If you don't understand
344 what was just said, you don't need it: say N.
345
346 Documentation on how to use the packet generator can be found
347 at <file:Documentation/networking/pktgen.rst>.
348
349 To compile this code as a module, choose M here: the
350 module will be called pktgen.
351
352config NET_DROP_MONITOR
353 tristate "Network packet drop alerting service"
354 depends on INET && TRACEPOINTS
355 help
356 This feature provides an alerting service to userspace in the
357 event that packets are discarded in the network stack. Alerts
358 are broadcast via netlink socket to any listening user space
359 process. If you don't need network drop alerts, or if you are ok
360 just checking the various proc files and other utilities for
361 drop statistics, say N here.
362
363endmenu
364
365endmenu
366
367source "net/ax25/Kconfig"
368source "net/can/Kconfig"
369source "net/bluetooth/Kconfig"
370source "net/rxrpc/Kconfig"
371source "net/kcm/Kconfig"
372source "net/strparser/Kconfig"
373
374config FIB_RULES
375 bool
376
377menuconfig WIRELESS
378 bool "Wireless"
379 depends on !S390
380 default y
381
382if WIRELESS
383
384source "net/wireless/Kconfig"
385source "net/mac80211/Kconfig"
386
387endif
388
389source "net/wimax/Kconfig"
390
391source "net/rfkill/Kconfig"
392source "net/9p/Kconfig"
393source "net/caif/Kconfig"
394source "net/ceph/Kconfig"
395source "net/nfc/Kconfig"
396source "net/psample/Kconfig"
397source "net/ife/Kconfig"
398
399config LWTUNNEL
400 bool "Network light weight tunnels"
401 help
402 This feature provides an infrastructure to support light weight
403 tunnels like mpls. There is no netdevice associated with a light
404 weight tunnel endpoint. Tunnel encapsulation parameters are stored
405 with light weight tunnel state associated with fib routes.
406
407config LWTUNNEL_BPF
408 bool "Execute BPF program as route nexthop action"
409 depends on LWTUNNEL && INET
410 default y if LWTUNNEL=y
411 help
412 Allows to run BPF programs as a nexthop action following a route
413 lookup for incoming and outgoing packets.
414
415config DST_CACHE
416 bool
417 default n
418
419config GRO_CELLS
420 bool
421 default n
422
423config SOCK_VALIDATE_XMIT
424 bool
425
426config NET_SOCK_MSG
427 bool
428 default n
429 help
430 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
431 ULPs (upper layer modules, e.g. TLS) to process L7 application data
432 with the help of BPF programs.
433
434config NET_DEVLINK
435 bool
436 default n
437 imply NET_DROP_MONITOR
438
439config PAGE_POOL
440 bool
441
442config FAILOVER
443 tristate "Generic failover module"
444 help
445 The failover module provides a generic interface for paravirtual
446 drivers to register a netdev and a set of ops with a failover
447 instance. The ops are used as event handlers that get called to
448 handle netdev register/unregister/link change/name change events
449 on slave pci ethernet devices with the same mac address as the
450 failover netdev. This enables paravirtual drivers to use a
451 VF as an accelerated low latency datapath. It also allows live
452 migration of VMs with direct attached VFs by failing over to the
453 paravirtual datapath when the VF is unplugged.
454
455config ETHTOOL_NETLINK
456 bool "Netlink interface for ethtool"
457 default y
458 help
459 An alternative userspace interface for ethtool based on generic
460 netlink. It provides better extensibility and some new features,
461 e.g. notification messages.
462
463endif
464
465
466
467
468
469
470config HAVE_CBPF_JIT
471 bool
472
473
474config HAVE_EBPF_JIT
475 bool
476
