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1da177e4
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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"
ac713874 60source "net/smc/Kconfig"
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61
62config INET
63 bool "TCP/IP networking"
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64 select CRYPTO
65 select CRYPTO_AES
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66 ---help---
67 These are the protocols used on the Internet and on most local
68 Ethernets. It is highly recommended to say Y here (this will enlarge
cf80efc2 69 your kernel by about 400 KB), since some programs (e.g. the X window
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70 system) use TCP/IP even if your machine is not connected to any
71 other computer. You will get the so-called loopback device which
72 allows you to ping yourself (great fun, that!).
73
74 For an excellent introduction to Linux networking, please read the
75 Linux Networking HOWTO, available from
76 <http://www.tldp.org/docs.html#howto>.
77
78 If you say Y here and also to "/proc file system support" and
79 "Sysctl support" below, you can change various aspects of the
80 behavior of the TCP/IP code by writing to the (virtual) files in
81 /proc/sys/net/ipv4/*; the options are explained in the file
82 <file:Documentation/networking/ip-sysctl.txt>.
83
84 Short answer: say Y.
85
6a2e9b73 86if INET
1da177e4 87source "net/ipv4/Kconfig"
1da177e4 88source "net/ipv6/Kconfig"
38c94377 89source "net/netlabel/Kconfig"
1da177e4 90
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91endif # if INET
92
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93config NETWORK_SECMARK
94 bool "Security Marking"
95 help
96 This enables security marking of network packets, similar
97 to nfmark, but designated for security purposes.
98 If you are unsure how to answer this question, answer N.
99
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100config NET_PTP_CLASSIFY
101 def_bool n
102
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103config NETWORK_PHY_TIMESTAMPING
104 bool "Timestamping in PHY devices"
408eccce 105 select NET_PTP_CLASSIFY
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106 help
107 This allows timestamping of network packets by PHYs with
108 hardware timestamping capabilities. This option adds some
109 overhead in the transmit and receive paths.
110
111 If you are unsure how to answer this question, answer N.
112
1da177e4 113menuconfig NETFILTER
ef91fd52 114 bool "Network packet filtering framework (Netfilter)"
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115 ---help---
116 Netfilter is a framework for filtering and mangling network packets
117 that pass through your Linux box.
118
119 The most common use of packet filtering is to run your Linux box as
120 a firewall protecting a local network from the Internet. The type of
121 firewall provided by this kernel support is called a "packet
122 filter", which means that it can reject individual network packets
123 based on type, source, destination etc. The other kind of firewall,
124 a "proxy-based" one, is more secure but more intrusive and more
125 bothersome to set up; it inspects the network traffic much more
126 closely, modifies it and has knowledge about the higher level
127 protocols, which a packet filter lacks. Moreover, proxy-based
128 firewalls often require changes to the programs running on the local
129 clients. Proxy-based firewalls don't need support by the kernel, but
130 they are often combined with a packet filter, which only works if
131 you say Y here.
132
133 You should also say Y here if you intend to use your Linux box as
134 the gateway to the Internet for a local network of machines without
135 globally valid IP addresses. This is called "masquerading": if one
136 of the computers on your local network wants to send something to
137 the outside, your box can "masquerade" as that computer, i.e. it
138 forwards the traffic to the intended outside destination, but
139 modifies the packets to make it look like they came from the
140 firewall box itself. It works both ways: if the outside host
141 replies, the Linux box will silently forward the traffic to the
142 correct local computer. This way, the computers on your local net
143 are completely invisible to the outside world, even though they can
144 reach the outside and can receive replies. It is even possible to
145 run globally visible servers from within a masqueraded local network
146 using a mechanism called portforwarding. Masquerading is also often
147 called NAT (Network Address Translation).
148
149 Another use of Netfilter is in transparent proxying: if a machine on
150 the local network tries to connect to an outside host, your Linux
151 box can transparently forward the traffic to a local server,
152 typically a caching proxy server.
153
154 Yet another use of Netfilter is building a bridging firewall. Using
155 a bridge with Network packet filtering enabled makes iptables "see"
156 the bridged traffic. For filtering on the lower network and Ethernet
157 protocols over the bridge, use ebtables (under bridge netfilter
158 configuration).
159
160 Various modules exist for netfilter which replace the previous
161 masquerading (ipmasqadm), packet filtering (ipchains), transparent
162 proxying, and portforwarding mechanisms. Please see
163 <file:Documentation/Changes> under "iptables" for the location of
164 these packages.
165
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166if NETFILTER
167
168config NETFILTER_DEBUG
169 bool "Network packet filtering debugging"
170 depends on NETFILTER
171 help
172 You can say Y here if you want to get additional messages useful in
173 debugging the netfilter code.
174
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175config NETFILTER_ADVANCED
176 bool "Advanced netfilter configuration"
177 depends on NETFILTER
178 default y
179 help
180 If you say Y here you can select between all the netfilter modules.
692105b8 181 If you say N the more unusual ones will not be shown and the
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182 basic ones needed by most people will default to 'M'.
183
184 If unsure, say Y.
185
1da177e4 186config BRIDGE_NETFILTER
34666d46 187 tristate "Bridged IP/ARP packets filtering"
57f5877c 188 depends on BRIDGE
34666d46 189 depends on NETFILTER && INET
33b8e776 190 depends on NETFILTER_ADVANCED
34666d46 191 default m
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192 ---help---
193 Enabling this option will let arptables resp. iptables see bridged
194 ARP resp. IP traffic. If you want a bridging firewall, you probably
195 want this option enabled.
196 Enabling or disabling this option doesn't enable or disable
197 ebtables.
198
199 If unsure, say N.
200
9eb0eec7 201source "net/netfilter/Kconfig"
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202source "net/ipv4/netfilter/Kconfig"
203source "net/ipv6/netfilter/Kconfig"
204source "net/decnet/netfilter/Kconfig"
205source "net/bridge/netfilter/Kconfig"
206
207endif
208
7c657876 209source "net/dccp/Kconfig"
1da177e4 210source "net/sctp/Kconfig"
fe17f84f 211source "net/rds/Kconfig"
1e63e681 212source "net/tipc/Kconfig"
6a2e9b73 213source "net/atm/Kconfig"
fd558d18 214source "net/l2tp/Kconfig"
a19800d7 215source "net/802/Kconfig"
6a2e9b73 216source "net/bridge/Kconfig"
91da11f8 217source "net/dsa/Kconfig"
6a2e9b73 218source "net/8021q/Kconfig"
1da177e4 219source "net/decnet/Kconfig"
1da177e4 220source "net/llc/Kconfig"
1da177e4 221source "net/ipx/Kconfig"
1da177e4 222source "drivers/net/appletalk/Kconfig"
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223source "net/x25/Kconfig"
224source "net/lapb/Kconfig"
5075138d 225source "net/phonet/Kconfig"
2c6bed7c 226source "net/6lowpan/Kconfig"
9ec76716 227source "net/ieee802154/Kconfig"
1010f540 228source "net/mac802154/Kconfig"
1da177e4 229source "net/sched/Kconfig"
2f90b865 230source "net/dcb/Kconfig"
1a4240f4 231source "net/dns_resolver/Kconfig"
c6c8fea2 232source "net/batman-adv/Kconfig"
ccb1352e 233source "net/openvswitch/Kconfig"
d021c344 234source "net/vmw_vsock/Kconfig"
eaaa3139 235source "net/netlink/Kconfig"
0d89d203 236source "net/mpls/Kconfig"
f421436a 237source "net/hsr/Kconfig"
007f790c 238source "net/switchdev/Kconfig"
1b69c6d0 239source "net/l3mdev/Kconfig"
bdabad3e 240source "net/qrtr/Kconfig"
2d283bdd 241source "net/ncsi/Kconfig"
1da177e4 242
df334545 243config RPS
6341e62b 244 bool
044c8d4b 245 depends on SMP && SYSFS
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246 default y
247
c445477d 248config RFS_ACCEL
6341e62b 249 bool
0244ad00 250 depends on RPS
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251 select CPU_RMAP
252 default y
253
bf264145 254config XPS
6341e62b 255 bool
044c8d4b 256 depends on SMP
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257 default y
258
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259config HWBM
260 bool
261
86f8515f 262config CGROUP_NET_PRIO
af636337 263 bool "Network priority cgroup"
5bc1421e 264 depends on CGROUPS
2a56a1fe 265 select SOCK_CGROUP_DATA
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266 ---help---
267 Cgroup subsystem for use in assigning processes to network priorities on
86f8515f 268 a per-interface basis.
5bc1421e 269
fe1217c4 270config CGROUP_NET_CLASSID
6341e62b 271 bool "Network classid cgroup"
fe1217c4 272 depends on CGROUPS
2a56a1fe 273 select SOCK_CGROUP_DATA
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274 ---help---
275 Cgroup subsystem for use as general purpose socket classid marker that is
276 being used in cls_cgroup and for netfilter matching.
277
e0d1095a 278config NET_RX_BUSY_POLL
6341e62b 279 bool
89bf1b5a 280 default y
06021292 281
114cf580 282config BQL
6341e62b 283 bool
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284 depends on SYSFS
285 select DQL
286 default y
287
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288config BPF_JIT
289 bool "enable BPF Just In Time compiler"
6077776b 290 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
b6202f97 291 depends on MODULES
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292 ---help---
293 Berkeley Packet Filter filtering capabilities are normally handled
294 by an interpreter. This option allows kernel to generate a native
295 code when filter is loaded in memory. This should speedup
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296 packet sniffing (libpcap/tcpdump).
297
298 Note, admin should enable this feature changing:
299 /proc/sys/net/core/bpf_jit_enable
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300 /proc/sys/net/core/bpf_jit_harden (optional)
301 /proc/sys/net/core/bpf_jit_kallsyms (optional)
0a14842f 302
99bbc707 303config NET_FLOW_LIMIT
6341e62b 304 bool
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305 depends on RPS
306 default y
307 ---help---
308 The network stack has to drop packets when a receive processing CPU's
309 backlog reaches netdev_max_backlog. If a few out of many active flows
310 generate the vast majority of load, drop their traffic earlier to
311 maintain capacity for the other flows. This feature provides servers
312 with many clients some protection against DoS by a single (spoofed)
313 flow that greatly exceeds average workload.
314
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315menu "Network testing"
316
317config NET_PKTGEN
318 tristate "Packet Generator (USE WITH CAUTION)"
ffd756b3 319 depends on INET && PROC_FS
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320 ---help---
321 This module will inject preconfigured packets, at a configurable
322 rate, out of a given interface. It is used for network interface
323 stress testing and performance analysis. If you don't understand
324 what was just said, you don't need it: say N.
325
326 Documentation on how to use the packet generator can be found
327 at <file:Documentation/networking/pktgen.txt>.
328
329 To compile this code as a module, choose M here: the
330 module will be called pktgen.
331
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332config NET_TCPPROBE
333 tristate "TCP connection probing"
911f8635 334 depends on INET && PROC_FS && KPROBES
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335 ---help---
336 This module allows for capturing the changes to TCP connection
9dadaa19 337 state in response to incoming packets. It is used for debugging
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338 TCP congestion avoidance modules. If you don't understand
339 what was just said, you don't need it: say N.
340
82fe7c92 341 Documentation on how to use TCP connection probing can be found
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342 at:
343
344 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
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345
346 To compile this code as a module, choose M here: the
347 module will be called tcp_probe.
348
273ae44b 349config NET_DROP_MONITOR
cad456d5 350 tristate "Network packet drop alerting service"
911f8635 351 depends on INET && TRACEPOINTS
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352 ---help---
353 This feature provides an alerting service to userspace in the
354 event that packets are discarded in the network stack. Alerts
355 are broadcast via netlink socket to any listening user space
356 process. If you don't need network drop alerts, or if you are ok
357 just checking the various proc files and other utilities for
358 drop statistics, say N here.
359
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360endmenu
361
362endmenu
363
1da177e4 364source "net/ax25/Kconfig"
0d66548a 365source "net/can/Kconfig"
1da177e4 366source "net/irda/Kconfig"
1da177e4 367source "net/bluetooth/Kconfig"
17926a79 368source "net/rxrpc/Kconfig"
ab7ac4eb 369source "net/kcm/Kconfig"
43a0c675 370source "net/strparser/Kconfig"
d86b5e0e 371
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372config FIB_RULES
373 bool
374
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375menuconfig WIRELESS
376 bool "Wireless"
f54bfc0e 377 depends on !S390
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378 default y
379
380if WIRELESS
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381
382source "net/wireless/Kconfig"
f0706e82 383source "net/mac80211/Kconfig"
2a5e1c0e 384
5442060c 385endif # WIRELESS
2a5e1c0e 386
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387source "net/wimax/Kconfig"
388
cf4328cd 389source "net/rfkill/Kconfig"
bd238fb4 390source "net/9p/Kconfig"
3908c690 391source "net/caif/Kconfig"
3d14c5d2 392source "net/ceph/Kconfig"
3e256b8f 393source "net/nfc/Kconfig"
6ae0a628 394source "net/psample/Kconfig"
1ce84604 395source "net/ife/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
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405config LWTUNNEL_BPF
406 bool "Execute BPF program as route nexthop action"
407 depends on LWTUNNEL
408 default y if LWTUNNEL=y
409 ---help---
410 Allows to run BPF programs as a nexthop action following a route
411 lookup for incoming and outgoing packets.
412
911362c7 413config DST_CACHE
9b246841 414 bool
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415 default n
416
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417config GRO_CELLS
418 bool
419 default n
420
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421config NET_DEVLINK
422 tristate "Network physical/parent device Netlink interface"
423 help
424 Network physical/parent device Netlink interface provides
425 infrastructure to support access to physical chip-wide config and
426 monitoring.
427
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428config MAY_USE_DEVLINK
429 tristate
430 default m if NET_DEVLINK=m
431 default y if NET_DEVLINK=y || NET_DEVLINK=n
432 help
433 Drivers using the devlink infrastructure should have a dependency
434 on MAY_USE_DEVLINK to ensure they do not cause link errors when
435 devlink is a loadable module and the driver using it is built-in.
436
6a2e9b73 437endif # if NET
e47b65b0 438
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439# Used by archs to tell that they support BPF JIT compiler plus which flavour.
440# Only one of the two can be selected for a specific arch since eBPF JIT supersedes
441# the cBPF JIT.
442
443# Classic BPF JIT (cBPF)
444config HAVE_CBPF_JIT
445 bool
446
447# Extended BPF JIT (eBPF)
448config HAVE_EBPF_JIT
e47b65b0 449 bool