Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#
2# Network configuration
3#
4
5menuconfig NET
6 bool "Networking support"
7 select NLATTR
8 select GENERIC_NET_UTILS
9 ---help---
10 Unless you really know what you are doing, you should say Y here.
11 The reason is that some programs need kernel networking support even
12 when running on a stand-alone machine that isn't connected to any
13 other computer.
14
15 If you are upgrading from an older kernel, you
16 should consider updating your networking tools too because changes
17 in the kernel and the tools often go hand in hand. The tools are
18 contained in the package net-tools, the location and version number
19 of which are given in <file:Documentation/Changes>.
20
21 For a general introduction to Linux networking, it is highly
22 recommended to read the NET-HOWTO, available from
23 <http://www.tldp.org/docs.html#howto>.
24
25if NET
26
27config WANT_COMPAT_NETLINK_MESSAGES
28 bool
29 help
30 This option can be selected by other options that need compat
31 netlink messages.
32
33config COMPAT_NETLINK_MESSAGES
34 def_bool y
35 depends on COMPAT
36 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
37 help
38 This option makes it possible to send different netlink messages
39 to tasks depending on whether the task is a compat task or not. To
40 achieve this, you need to set skb_shinfo(skb)->frag_list to the
41 compat skb before sending the skb, the netlink code will sort out
42 which message to actually pass to the task.
43
44 Newly written code should NEVER need this option but do
45 compat-independent messages instead!
46
47menu "Networking options"
48
49source "net/packet/Kconfig"
50source "net/unix/Kconfig"
51source "net/xfrm/Kconfig"
52source "net/iucv/Kconfig"
53
54config INET
55 bool "TCP/IP networking"
56 select CRYPTO
57 select CRYPTO_AES
58 ---help---
59 These are the protocols used on the Internet and on most local
60 Ethernets. It is highly recommended to say Y here (this will enlarge
61 your kernel by about 400 KB), since some programs (e.g. the X window
62 system) use TCP/IP even if your machine is not connected to any
63 other computer. You will get the so-called loopback device which
64 allows you to ping yourself (great fun, that!).
65
66 For an excellent introduction to Linux networking, please read the
67 Linux Networking HOWTO, available from
68 <http://www.tldp.org/docs.html#howto>.
69
70 If you say Y here and also to "/proc file system support" and
71 "Sysctl support" below, you can change various aspects of the
72 behavior of the TCP/IP code by writing to the (virtual) files in
73 /proc/sys/net/ipv4/*; the options are explained in the file
74 <file:Documentation/networking/ip-sysctl.txt>.
75
76 Short answer: say Y.
77
78if INET
79source "net/ipv4/Kconfig"
80source "net/ipv6/Kconfig"
81source "net/netlabel/Kconfig"
82
83endif # if INET
84
85config NETWORK_SECMARK
86 bool "Security Marking"
87 help
88 This enables security marking of network packets, similar
89 to nfmark, but designated for security purposes.
90 If you are unsure how to answer this question, answer N.
91
92config NETWORK_PHY_TIMESTAMPING
93 bool "Timestamping in PHY devices"
94 help
95 This allows timestamping of network packets by PHYs with
96 hardware timestamping capabilities. This option adds some
97 overhead in the transmit and receive paths.
98
99 If you are unsure how to answer this question, answer N.
100
101menuconfig NETFILTER
102 bool "Network packet filtering framework (Netfilter)"
103 ---help---
104 Netfilter is a framework for filtering and mangling network packets
105 that pass through your Linux box.
106
107 The most common use of packet filtering is to run your Linux box as
108 a firewall protecting a local network from the Internet. The type of
109 firewall provided by this kernel support is called a "packet
110 filter", which means that it can reject individual network packets
111 based on type, source, destination etc. The other kind of firewall,
112 a "proxy-based" one, is more secure but more intrusive and more
113 bothersome to set up; it inspects the network traffic much more
114 closely, modifies it and has knowledge about the higher level
115 protocols, which a packet filter lacks. Moreover, proxy-based
116 firewalls often require changes to the programs running on the local
117 clients. Proxy-based firewalls don't need support by the kernel, but
118 they are often combined with a packet filter, which only works if
119 you say Y here.
120
121 You should also say Y here if you intend to use your Linux box as
122 the gateway to the Internet for a local network of machines without
123 globally valid IP addresses. This is called "masquerading": if one
124 of the computers on your local network wants to send something to
125 the outside, your box can "masquerade" as that computer, i.e. it
126 forwards the traffic to the intended outside destination, but
127 modifies the packets to make it look like they came from the
128 firewall box itself. It works both ways: if the outside host
129 replies, the Linux box will silently forward the traffic to the
130 correct local computer. This way, the computers on your local net
131 are completely invisible to the outside world, even though they can
132 reach the outside and can receive replies. It is even possible to
133 run globally visible servers from within a masqueraded local network
134 using a mechanism called portforwarding. Masquerading is also often
135 called NAT (Network Address Translation).
136
137 Another use of Netfilter is in transparent proxying: if a machine on
138 the local network tries to connect to an outside host, your Linux
139 box can transparently forward the traffic to a local server,
140 typically a caching proxy server.
141
142 Yet another use of Netfilter is building a bridging firewall. Using
143 a bridge with Network packet filtering enabled makes iptables "see"
144 the bridged traffic. For filtering on the lower network and Ethernet
145 protocols over the bridge, use ebtables (under bridge netfilter
146 configuration).
147
148 Various modules exist for netfilter which replace the previous
149 masquerading (ipmasqadm), packet filtering (ipchains), transparent
150 proxying, and portforwarding mechanisms. Please see
151 <file:Documentation/Changes> under "iptables" for the location of
152 these packages.
153
154if NETFILTER
155
156config NETFILTER_DEBUG
157 bool "Network packet filtering debugging"
158 depends on NETFILTER
159 help
160 You can say Y here if you want to get additional messages useful in
161 debugging the netfilter code.
162
163config NETFILTER_ADVANCED
164 bool "Advanced netfilter configuration"
165 depends on NETFILTER
166 default y
167 help
168 If you say Y here you can select between all the netfilter modules.
169 If you say N the more unusual ones will not be shown and the
170 basic ones needed by most people will default to 'M'.
171
172 If unsure, say Y.
173
174config BRIDGE_NETFILTER
175 bool "Bridged IP/ARP packets filtering"
176 depends on BRIDGE && NETFILTER && INET
177 depends on NETFILTER_ADVANCED
178 default y
179 ---help---
180 Enabling this option will let arptables resp. iptables see bridged
181 ARP resp. IP traffic. If you want a bridging firewall, you probably
182 want this option enabled.
183 Enabling or disabling this option doesn't enable or disable
184 ebtables.
185
186 If unsure, say N.
187
188source "net/netfilter/Kconfig"
189source "net/ipv4/netfilter/Kconfig"
190source "net/ipv6/netfilter/Kconfig"
191source "net/decnet/netfilter/Kconfig"
192source "net/bridge/netfilter/Kconfig"
193
194endif
195
196source "net/dccp/Kconfig"
197source "net/sctp/Kconfig"
198source "net/rds/Kconfig"
199source "net/tipc/Kconfig"
200source "net/atm/Kconfig"
201source "net/l2tp/Kconfig"
202source "net/802/Kconfig"
203source "net/bridge/Kconfig"
204source "net/dsa/Kconfig"
205source "net/8021q/Kconfig"
206source "net/decnet/Kconfig"
207source "net/llc/Kconfig"
208source "net/ipx/Kconfig"
209source "drivers/net/appletalk/Kconfig"
210source "net/x25/Kconfig"
211source "net/lapb/Kconfig"
212source "net/phonet/Kconfig"
213source "net/ieee802154/Kconfig"
214source "net/mac802154/Kconfig"
215source "net/sched/Kconfig"
216source "net/dcb/Kconfig"
217source "net/dns_resolver/Kconfig"
218source "net/batman-adv/Kconfig"
219source "net/openvswitch/Kconfig"
220source "net/vmw_vsock/Kconfig"
221source "net/netlink/Kconfig"
222source "net/mpls/Kconfig"
223source "net/hsr/Kconfig"
224
225config RPS
226 boolean
227 depends on SMP && SYSFS
228 default y
229
230config RFS_ACCEL
231 boolean
232 depends on RPS
233 select CPU_RMAP
234 default y
235
236config XPS
237 boolean
238 depends on SMP
239 default y
240
241config CGROUP_NET_PRIO
242 tristate "Network priority cgroup"
243 depends on CGROUPS
244 ---help---
245 Cgroup subsystem for use in assigning processes to network priorities on
246 a per-interface basis.
247
248config CGROUP_NET_CLASSID
249 boolean "Network classid cgroup"
250 depends on CGROUPS
251 ---help---
252 Cgroup subsystem for use as general purpose socket classid marker that is
253 being used in cls_cgroup and for netfilter matching.
254
255config NET_RX_BUSY_POLL
256 boolean
257 default y
258
259config BQL
260 boolean
261 depends on SYSFS
262 select DQL
263 default y
264
265config BPF_JIT
266 bool "enable BPF Just In Time compiler"
267 depends on HAVE_BPF_JIT
268 depends on MODULES
269 ---help---
270 Berkeley Packet Filter filtering capabilities are normally handled
271 by an interpreter. This option allows kernel to generate a native
272 code when filter is loaded in memory. This should speedup
273 packet sniffing (libpcap/tcpdump). Note : Admin should enable
274 this feature changing /proc/sys/net/core/bpf_jit_enable
275
276config NET_FLOW_LIMIT
277 boolean
278 depends on RPS
279 default y
280 ---help---
281 The network stack has to drop packets when a receive processing CPU's
282 backlog reaches netdev_max_backlog. If a few out of many active flows
283 generate the vast majority of load, drop their traffic earlier to
284 maintain capacity for the other flows. This feature provides servers
285 with many clients some protection against DoS by a single (spoofed)
286 flow that greatly exceeds average workload.
287
288menu "Network testing"
289
290config NET_PKTGEN
291 tristate "Packet Generator (USE WITH CAUTION)"
292 depends on INET && PROC_FS
293 ---help---
294 This module will inject preconfigured packets, at a configurable
295 rate, out of a given interface. It is used for network interface
296 stress testing and performance analysis. If you don't understand
297 what was just said, you don't need it: say N.
298
299 Documentation on how to use the packet generator can be found
300 at <file:Documentation/networking/pktgen.txt>.
301
302 To compile this code as a module, choose M here: the
303 module will be called pktgen.
304
305config NET_TCPPROBE
306 tristate "TCP connection probing"
307 depends on INET && PROC_FS && KPROBES
308 ---help---
309 This module allows for capturing the changes to TCP connection
310 state in response to incoming packets. It is used for debugging
311 TCP congestion avoidance modules. If you don't understand
312 what was just said, you don't need it: say N.
313
314 Documentation on how to use TCP connection probing can be found
315 at:
316
317 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
318
319 To compile this code as a module, choose M here: the
320 module will be called tcp_probe.
321
322config NET_DROP_MONITOR
323 tristate "Network packet drop alerting service"
324 depends on INET && TRACEPOINTS
325 ---help---
326 This feature provides an alerting service to userspace in the
327 event that packets are discarded in the network stack. Alerts
328 are broadcast via netlink socket to any listening user space
329 process. If you don't need network drop alerts, or if you are ok
330 just checking the various proc files and other utilities for
331 drop statistics, say N here.
332
333endmenu
334
335endmenu
336
337source "net/ax25/Kconfig"
338source "net/can/Kconfig"
339source "net/irda/Kconfig"
340source "net/bluetooth/Kconfig"
341source "net/rxrpc/Kconfig"
342
343config FIB_RULES
344 bool
345
346menuconfig WIRELESS
347 bool "Wireless"
348 depends on !S390
349 default y
350
351if WIRELESS
352
353source "net/wireless/Kconfig"
354source "net/mac80211/Kconfig"
355
356endif # WIRELESS
357
358source "net/wimax/Kconfig"
359
360source "net/rfkill/Kconfig"
361source "net/9p/Kconfig"
362source "net/caif/Kconfig"
363source "net/ceph/Kconfig"
364source "net/nfc/Kconfig"
365
366
367endif # if NET
368
369# Used by archs to tell that they support BPF_JIT
370config HAVE_BPF_JIT
371 bool