Merge tag 'nios2-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan...
[linux-2.6-block.git] / net / Kconfig
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1#
2# Network configuration
3#
4
031cf19e 5menuconfig NET
1da177e4 6 bool "Networking support"
e9cc8bdd 7 select NLATTR
4cd5773a 8 select GENERIC_NET_UTILS
f89b7755 9 select BPF
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10 ---help---
11 Unless you really know what you are doing, you should say Y here.
12 The reason is that some programs need kernel networking support even
13 when running on a stand-alone machine that isn't connected to any
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14 other computer.
15
16 If you are upgrading from an older kernel, you
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17 should consider updating your networking tools too because changes
18 in the kernel and the tools often go hand in hand. The tools are
19 contained in the package net-tools, the location and version number
20 of which are given in <file:Documentation/Changes>.
21
22 For a general introduction to Linux networking, it is highly
23 recommended to read the NET-HOWTO, available from
24 <http://www.tldp.org/docs.html#howto>.
25
6a2e9b73 26if NET
1da177e4 27
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28config WANT_COMPAT_NETLINK_MESSAGES
29 bool
30 help
31 This option can be selected by other options that need compat
32 netlink messages.
33
34config COMPAT_NETLINK_MESSAGES
35 def_bool y
36 depends on COMPAT
40b53d8a 37 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
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38 help
39 This option makes it possible to send different netlink messages
40 to tasks depending on whether the task is a compat task or not. To
41 achieve this, you need to set skb_shinfo(skb)->frag_list to the
42 compat skb before sending the skb, the netlink code will sort out
43 which message to actually pass to the task.
44
45 Newly written code should NEVER need this option but do
46 compat-independent messages instead!
47
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48config NET_INGRESS
49 bool
50
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51config NET_EGRESS
52 bool
53
6a2e9b73 54menu "Networking options"
1da177e4 55
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56source "net/packet/Kconfig"
57source "net/unix/Kconfig"
58source "net/xfrm/Kconfig"
2356f4cb 59source "net/iucv/Kconfig"
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60
61config INET
62 bool "TCP/IP networking"
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63 select CRYPTO
64 select CRYPTO_AES
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65 ---help---
66 These are the protocols used on the Internet and on most local
67 Ethernets. It is highly recommended to say Y here (this will enlarge
cf80efc2 68 your kernel by about 400 KB), since some programs (e.g. the X window
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69 system) use TCP/IP even if your machine is not connected to any
70 other computer. You will get the so-called loopback device which
71 allows you to ping yourself (great fun, that!).
72
73 For an excellent introduction to Linux networking, please read the
74 Linux Networking HOWTO, available from
75 <http://www.tldp.org/docs.html#howto>.
76
77 If you say Y here and also to "/proc file system support" and
78 "Sysctl support" below, you can change various aspects of the
79 behavior of the TCP/IP code by writing to the (virtual) files in
80 /proc/sys/net/ipv4/*; the options are explained in the file
81 <file:Documentation/networking/ip-sysctl.txt>.
82
83 Short answer: say Y.
84
6a2e9b73 85if INET
1da177e4 86source "net/ipv4/Kconfig"
1da177e4 87source "net/ipv6/Kconfig"
38c94377 88source "net/netlabel/Kconfig"
1da177e4 89
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90endif # if INET
91
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92config NETWORK_SECMARK
93 bool "Security Marking"
94 help
95 This enables security marking of network packets, similar
96 to nfmark, but designated for security purposes.
97 If you are unsure how to answer this question, answer N.
98
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99config NET_PTP_CLASSIFY
100 def_bool n
101
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102config NETWORK_PHY_TIMESTAMPING
103 bool "Timestamping in PHY devices"
408eccce 104 select NET_PTP_CLASSIFY
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105 help
106 This allows timestamping of network packets by PHYs with
107 hardware timestamping capabilities. This option adds some
108 overhead in the transmit and receive paths.
109
110 If you are unsure how to answer this question, answer N.
111
1da177e4 112menuconfig NETFILTER
ef91fd52 113 bool "Network packet filtering framework (Netfilter)"
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114 ---help---
115 Netfilter is a framework for filtering and mangling network packets
116 that pass through your Linux box.
117
118 The most common use of packet filtering is to run your Linux box as
119 a firewall protecting a local network from the Internet. The type of
120 firewall provided by this kernel support is called a "packet
121 filter", which means that it can reject individual network packets
122 based on type, source, destination etc. The other kind of firewall,
123 a "proxy-based" one, is more secure but more intrusive and more
124 bothersome to set up; it inspects the network traffic much more
125 closely, modifies it and has knowledge about the higher level
126 protocols, which a packet filter lacks. Moreover, proxy-based
127 firewalls often require changes to the programs running on the local
128 clients. Proxy-based firewalls don't need support by the kernel, but
129 they are often combined with a packet filter, which only works if
130 you say Y here.
131
132 You should also say Y here if you intend to use your Linux box as
133 the gateway to the Internet for a local network of machines without
134 globally valid IP addresses. This is called "masquerading": if one
135 of the computers on your local network wants to send something to
136 the outside, your box can "masquerade" as that computer, i.e. it
137 forwards the traffic to the intended outside destination, but
138 modifies the packets to make it look like they came from the
139 firewall box itself. It works both ways: if the outside host
140 replies, the Linux box will silently forward the traffic to the
141 correct local computer. This way, the computers on your local net
142 are completely invisible to the outside world, even though they can
143 reach the outside and can receive replies. It is even possible to
144 run globally visible servers from within a masqueraded local network
145 using a mechanism called portforwarding. Masquerading is also often
146 called NAT (Network Address Translation).
147
148 Another use of Netfilter is in transparent proxying: if a machine on
149 the local network tries to connect to an outside host, your Linux
150 box can transparently forward the traffic to a local server,
151 typically a caching proxy server.
152
153 Yet another use of Netfilter is building a bridging firewall. Using
154 a bridge with Network packet filtering enabled makes iptables "see"
155 the bridged traffic. For filtering on the lower network and Ethernet
156 protocols over the bridge, use ebtables (under bridge netfilter
157 configuration).
158
159 Various modules exist for netfilter which replace the previous
160 masquerading (ipmasqadm), packet filtering (ipchains), transparent
161 proxying, and portforwarding mechanisms. Please see
162 <file:Documentation/Changes> under "iptables" for the location of
163 these packages.
164
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165if NETFILTER
166
167config NETFILTER_DEBUG
168 bool "Network packet filtering debugging"
169 depends on NETFILTER
170 help
171 You can say Y here if you want to get additional messages useful in
172 debugging the netfilter code.
173
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174config NETFILTER_ADVANCED
175 bool "Advanced netfilter configuration"
176 depends on NETFILTER
177 default y
178 help
179 If you say Y here you can select between all the netfilter modules.
692105b8 180 If you say N the more unusual ones will not be shown and the
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181 basic ones needed by most people will default to 'M'.
182
183 If unsure, say Y.
184
1da177e4 185config BRIDGE_NETFILTER
34666d46 186 tristate "Bridged IP/ARP packets filtering"
57f5877c 187 depends on BRIDGE
34666d46 188 depends on NETFILTER && INET
33b8e776 189 depends on NETFILTER_ADVANCED
34666d46 190 default m
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191 ---help---
192 Enabling this option will let arptables resp. iptables see bridged
193 ARP resp. IP traffic. If you want a bridging firewall, you probably
194 want this option enabled.
195 Enabling or disabling this option doesn't enable or disable
196 ebtables.
197
198 If unsure, say N.
199
9eb0eec7 200source "net/netfilter/Kconfig"
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201source "net/ipv4/netfilter/Kconfig"
202source "net/ipv6/netfilter/Kconfig"
203source "net/decnet/netfilter/Kconfig"
204source "net/bridge/netfilter/Kconfig"
205
206endif
207
7c657876 208source "net/dccp/Kconfig"
1da177e4 209source "net/sctp/Kconfig"
fe17f84f 210source "net/rds/Kconfig"
1e63e681 211source "net/tipc/Kconfig"
6a2e9b73 212source "net/atm/Kconfig"
fd558d18 213source "net/l2tp/Kconfig"
a19800d7 214source "net/802/Kconfig"
6a2e9b73 215source "net/bridge/Kconfig"
91da11f8 216source "net/dsa/Kconfig"
6a2e9b73 217source "net/8021q/Kconfig"
1da177e4 218source "net/decnet/Kconfig"
1da177e4 219source "net/llc/Kconfig"
1da177e4 220source "net/ipx/Kconfig"
1da177e4 221source "drivers/net/appletalk/Kconfig"
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222source "net/x25/Kconfig"
223source "net/lapb/Kconfig"
5075138d 224source "net/phonet/Kconfig"
2c6bed7c 225source "net/6lowpan/Kconfig"
9ec76716 226source "net/ieee802154/Kconfig"
1010f540 227source "net/mac802154/Kconfig"
1da177e4 228source "net/sched/Kconfig"
2f90b865 229source "net/dcb/Kconfig"
1a4240f4 230source "net/dns_resolver/Kconfig"
c6c8fea2 231source "net/batman-adv/Kconfig"
ccb1352e 232source "net/openvswitch/Kconfig"
d021c344 233source "net/vmw_vsock/Kconfig"
eaaa3139 234source "net/netlink/Kconfig"
0d89d203 235source "net/mpls/Kconfig"
f421436a 236source "net/hsr/Kconfig"
007f790c 237source "net/switchdev/Kconfig"
1b69c6d0 238source "net/l3mdev/Kconfig"
bdabad3e 239source "net/qrtr/Kconfig"
2d283bdd 240source "net/ncsi/Kconfig"
1da177e4 241
df334545 242config RPS
6341e62b 243 bool
044c8d4b 244 depends on SMP && SYSFS
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245 default y
246
c445477d 247config RFS_ACCEL
6341e62b 248 bool
0244ad00 249 depends on RPS
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250 select CPU_RMAP
251 default y
252
bf264145 253config XPS
6341e62b 254 bool
044c8d4b 255 depends on SMP
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256 default y
257
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258config HWBM
259 bool
260
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261config SOCK_CGROUP_DATA
262 bool
263 default n
264
86f8515f 265config CGROUP_NET_PRIO
af636337 266 bool "Network priority cgroup"
5bc1421e 267 depends on CGROUPS
2a56a1fe 268 select SOCK_CGROUP_DATA
5bc1421e
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269 ---help---
270 Cgroup subsystem for use in assigning processes to network priorities on
86f8515f 271 a per-interface basis.
5bc1421e 272
fe1217c4 273config CGROUP_NET_CLASSID
6341e62b 274 bool "Network classid cgroup"
fe1217c4 275 depends on CGROUPS
2a56a1fe 276 select SOCK_CGROUP_DATA
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277 ---help---
278 Cgroup subsystem for use as general purpose socket classid marker that is
279 being used in cls_cgroup and for netfilter matching.
280
e0d1095a 281config NET_RX_BUSY_POLL
6341e62b 282 bool
89bf1b5a 283 default y
06021292 284
114cf580 285config BQL
6341e62b 286 bool
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287 depends on SYSFS
288 select DQL
289 default y
290
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291config BPF_JIT
292 bool "enable BPF Just In Time compiler"
6077776b 293 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
b6202f97 294 depends on MODULES
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295 ---help---
296 Berkeley Packet Filter filtering capabilities are normally handled
297 by an interpreter. This option allows kernel to generate a native
298 code when filter is loaded in memory. This should speedup
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299 packet sniffing (libpcap/tcpdump).
300
301 Note, admin should enable this feature changing:
302 /proc/sys/net/core/bpf_jit_enable
303 /proc/sys/net/core/bpf_jit_harden (optional)
0a14842f 304
99bbc707 305config NET_FLOW_LIMIT
6341e62b 306 bool
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307 depends on RPS
308 default y
309 ---help---
310 The network stack has to drop packets when a receive processing CPU's
311 backlog reaches netdev_max_backlog. If a few out of many active flows
312 generate the vast majority of load, drop their traffic earlier to
313 maintain capacity for the other flows. This feature provides servers
314 with many clients some protection against DoS by a single (spoofed)
315 flow that greatly exceeds average workload.
316
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317menu "Network testing"
318
319config NET_PKTGEN
320 tristate "Packet Generator (USE WITH CAUTION)"
ffd756b3 321 depends on INET && PROC_FS
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322 ---help---
323 This module will inject preconfigured packets, at a configurable
324 rate, out of a given interface. It is used for network interface
325 stress testing and performance analysis. If you don't understand
326 what was just said, you don't need it: say N.
327
328 Documentation on how to use the packet generator can be found
329 at <file:Documentation/networking/pktgen.txt>.
330
331 To compile this code as a module, choose M here: the
332 module will be called pktgen.
333
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334config NET_TCPPROBE
335 tristate "TCP connection probing"
911f8635 336 depends on INET && PROC_FS && KPROBES
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337 ---help---
338 This module allows for capturing the changes to TCP connection
9dadaa19 339 state in response to incoming packets. It is used for debugging
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340 TCP congestion avoidance modules. If you don't understand
341 what was just said, you don't need it: say N.
342
82fe7c92 343 Documentation on how to use TCP connection probing can be found
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344 at:
345
346 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
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347
348 To compile this code as a module, choose M here: the
349 module will be called tcp_probe.
350
273ae44b 351config NET_DROP_MONITOR
cad456d5 352 tristate "Network packet drop alerting service"
911f8635 353 depends on INET && TRACEPOINTS
273ae44b
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354 ---help---
355 This feature provides an alerting service to userspace in the
356 event that packets are discarded in the network stack. Alerts
357 are broadcast via netlink socket to any listening user space
358 process. If you don't need network drop alerts, or if you are ok
359 just checking the various proc files and other utilities for
360 drop statistics, say N here.
361
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362endmenu
363
364endmenu
365
1da177e4 366source "net/ax25/Kconfig"
0d66548a 367source "net/can/Kconfig"
1da177e4 368source "net/irda/Kconfig"
1da177e4 369source "net/bluetooth/Kconfig"
17926a79 370source "net/rxrpc/Kconfig"
ab7ac4eb 371source "net/kcm/Kconfig"
43a0c675 372source "net/strparser/Kconfig"
d86b5e0e 373
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374config FIB_RULES
375 bool
376
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377menuconfig WIRELESS
378 bool "Wireless"
f54bfc0e 379 depends on !S390
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380 default y
381
382if WIRELESS
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383
384source "net/wireless/Kconfig"
f0706e82 385source "net/mac80211/Kconfig"
2a5e1c0e 386
5442060c 387endif # WIRELESS
2a5e1c0e 388
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389source "net/wimax/Kconfig"
390
cf4328cd 391source "net/rfkill/Kconfig"
bd238fb4 392source "net/9p/Kconfig"
3908c690 393source "net/caif/Kconfig"
3d14c5d2 394source "net/ceph/Kconfig"
3e256b8f 395source "net/nfc/Kconfig"
3908c690 396
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397config LWTUNNEL
398 bool "Network light weight tunnels"
399 ---help---
400 This feature provides an infrastructure to support light weight
401 tunnels like mpls. There is no netdevice associated with a light
402 weight tunnel endpoint. Tunnel encapsulation parameters are stored
403 with light weight tunnel state associated with fib routes.
cf4328cd 404
911362c7 405config DST_CACHE
9b246841 406 bool
911362c7
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407 default n
408
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409config NET_DEVLINK
410 tristate "Network physical/parent device Netlink interface"
411 help
412 Network physical/parent device Netlink interface provides
413 infrastructure to support access to physical chip-wide config and
414 monitoring.
415
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416config MAY_USE_DEVLINK
417 tristate
418 default m if NET_DEVLINK=m
419 default y if NET_DEVLINK=y || NET_DEVLINK=n
420 help
421 Drivers using the devlink infrastructure should have a dependency
422 on MAY_USE_DEVLINK to ensure they do not cause link errors when
423 devlink is a loadable module and the driver using it is built-in.
424
6a2e9b73 425endif # if NET
e47b65b0 426
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427# Used by archs to tell that they support BPF JIT compiler plus which flavour.
428# Only one of the two can be selected for a specific arch since eBPF JIT supersedes
429# the cBPF JIT.
430
431# Classic BPF JIT (cBPF)
432config HAVE_CBPF_JIT
433 bool
434
435# Extended BPF JIT (eBPF)
436config HAVE_EBPF_JIT
e47b65b0 437 bool