tcp: Remove the unused api
[linux-block.git] / net / Kconfig
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ec8f24b7 1# SPDX-License-Identifier: GPL-2.0-only
1da177e4
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2#
3# Network configuration
4#
5
031cf19e 6menuconfig NET
1da177e4 7 bool "Networking support"
e9cc8bdd 8 select NLATTR
4cd5773a 9 select GENERIC_NET_UTILS
f89b7755 10 select BPF
a7f7f624 11 help
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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
d5950b43 15 other computer.
e446a276 16
d5950b43 17 If you are upgrading from an older kernel, you
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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
6a2e9b73 27if NET
1da177e4 28
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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
40b53d8a 38 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
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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
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49config NET_INGRESS
50 bool
51
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52config NET_EGRESS
53 bool
54
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55config NET_REDIRECT
56 bool
57
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58config SKB_EXTENSIONS
59 bool
60
6a2e9b73 61menu "Networking options"
1da177e4 62
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63source "net/packet/Kconfig"
64source "net/unix/Kconfig"
3c4d7559 65source "net/tls/Kconfig"
6a2e9b73 66source "net/xfrm/Kconfig"
2356f4cb 67source "net/iucv/Kconfig"
ac713874 68source "net/smc/Kconfig"
68e8b849 69source "net/xdp/Kconfig"
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70
71config INET
72 bool "TCP/IP networking"
a7f7f624 73 help
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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
cf80efc2 76 your kernel by about 400 KB), since some programs (e.g. the X window
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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
1cec2cac 89 <file:Documentation/networking/ip-sysctl.rst>.
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90
91 Short answer: say Y.
92
6a2e9b73 93if INET
1da177e4 94source "net/ipv4/Kconfig"
1da177e4 95source "net/ipv6/Kconfig"
38c94377 96source "net/netlabel/Kconfig"
f870fa0b 97source "net/mptcp/Kconfig"
1da177e4 98
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99endif # if INET
100
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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
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108config NET_PTP_CLASSIFY
109 def_bool n
110
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111config NETWORK_PHY_TIMESTAMPING
112 bool "Timestamping in PHY devices"
408eccce 113 select NET_PTP_CLASSIFY
c1f19b51 114 help
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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.
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119
120 If you are unsure how to answer this question, answer N.
121
1da177e4 122menuconfig NETFILTER
ef91fd52 123 bool "Network packet filtering framework (Netfilter)"
a7f7f624 124 help
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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
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175if NETFILTER
176
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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.
692105b8 183 If you say N the more unusual ones will not be shown and the
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184 basic ones needed by most people will default to 'M'.
185
186 If unsure, say Y.
187
1da177e4 188config BRIDGE_NETFILTER
34666d46 189 tristate "Bridged IP/ARP packets filtering"
57f5877c 190 depends on BRIDGE
34666d46 191 depends on NETFILTER && INET
33b8e776 192 depends on NETFILTER_ADVANCED
2a95183a 193 select NETFILTER_FAMILY_BRIDGE
de8bda1d 194 select SKB_EXTENSIONS
a7f7f624 195 help
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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
9eb0eec7 204source "net/netfilter/Kconfig"
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205source "net/ipv4/netfilter/Kconfig"
206source "net/ipv6/netfilter/Kconfig"
207source "net/decnet/netfilter/Kconfig"
208source "net/bridge/netfilter/Kconfig"
209
210endif
211
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212source "net/bpfilter/Kconfig"
213
7c657876 214source "net/dccp/Kconfig"
1da177e4 215source "net/sctp/Kconfig"
fe17f84f 216source "net/rds/Kconfig"
1e63e681 217source "net/tipc/Kconfig"
6a2e9b73 218source "net/atm/Kconfig"
fd558d18 219source "net/l2tp/Kconfig"
a19800d7 220source "net/802/Kconfig"
6a2e9b73 221source "net/bridge/Kconfig"
91da11f8 222source "net/dsa/Kconfig"
6a2e9b73 223source "net/8021q/Kconfig"
1da177e4 224source "net/decnet/Kconfig"
1da177e4 225source "net/llc/Kconfig"
1da177e4 226source "drivers/net/appletalk/Kconfig"
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227source "net/x25/Kconfig"
228source "net/lapb/Kconfig"
5075138d 229source "net/phonet/Kconfig"
2c6bed7c 230source "net/6lowpan/Kconfig"
9ec76716 231source "net/ieee802154/Kconfig"
1010f540 232source "net/mac802154/Kconfig"
1da177e4 233source "net/sched/Kconfig"
2f90b865 234source "net/dcb/Kconfig"
1a4240f4 235source "net/dns_resolver/Kconfig"
c6c8fea2 236source "net/batman-adv/Kconfig"
ccb1352e 237source "net/openvswitch/Kconfig"
d021c344 238source "net/vmw_vsock/Kconfig"
eaaa3139 239source "net/netlink/Kconfig"
0d89d203 240source "net/mpls/Kconfig"
c411ed85 241source "net/nsh/Kconfig"
f421436a 242source "net/hsr/Kconfig"
007f790c 243source "net/switchdev/Kconfig"
1b69c6d0 244source "net/l3mdev/Kconfig"
bdabad3e 245source "net/qrtr/Kconfig"
2d283bdd 246source "net/ncsi/Kconfig"
1da177e4 247
919067cc
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248config PCPU_DEV_REFCNT
249 bool "Use percpu variables to maintain network device refcount"
250 depends on SMP
251 default y
252 help
253 network device refcount are using per cpu variables if this option is set.
254 This can be forced to N to detect underflows (with a performance drop).
255
df334545 256config RPS
6341e62b 257 bool
044c8d4b 258 depends on SMP && SYSFS
df334545
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259 default y
260
c445477d 261config RFS_ACCEL
6341e62b 262 bool
0244ad00 263 depends on RPS
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264 select CPU_RMAP
265 default y
266
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267config SOCK_RX_QUEUE_MAPPING
268 bool
269
bf264145 270config XPS
6341e62b 271 bool
044c8d4b 272 depends on SMP
4e1beecc 273 select SOCK_RX_QUEUE_MAPPING
bf264145
TH
274 default y
275
8cb2d8bf 276config HWBM
43da1411 277 bool
8cb2d8bf 278
86f8515f 279config CGROUP_NET_PRIO
af636337 280 bool "Network priority cgroup"
5bc1421e 281 depends on CGROUPS
2a56a1fe 282 select SOCK_CGROUP_DATA
a7f7f624 283 help
5bc1421e 284 Cgroup subsystem for use in assigning processes to network priorities on
86f8515f 285 a per-interface basis.
5bc1421e 286
fe1217c4 287config CGROUP_NET_CLASSID
6341e62b 288 bool "Network classid cgroup"
fe1217c4 289 depends on CGROUPS
2a56a1fe 290 select SOCK_CGROUP_DATA
a7f7f624 291 help
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292 Cgroup subsystem for use as general purpose socket classid marker that is
293 being used in cls_cgroup and for netfilter matching.
294
e0d1095a 295config NET_RX_BUSY_POLL
6341e62b 296 bool
20ab39d1 297 default y if !PREEMPT_RT
06021292 298
114cf580 299config BQL
6341e62b 300 bool
114cf580
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301 depends on SYSFS
302 select DQL
303 default y
304
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305config BPF_STREAM_PARSER
306 bool "enable BPF STREAM_PARSER"
604326b4 307 depends on INET
08848246 308 depends on BPF_SYSCALL
604326b4 309 depends on CGROUP_BPF
08848246 310 select STREAM_PARSER
604326b4 311 select NET_SOCK_MSG
a7f7f624 312 help
88759609 313 Enabling this allows a TCP stream parser to be used with
43da1411 314 BPF_MAP_TYPE_SOCKMAP.
08848246 315
99bbc707 316config NET_FLOW_LIMIT
6341e62b 317 bool
99bbc707
WB
318 depends on RPS
319 default y
a7f7f624 320 help
99bbc707
WB
321 The network stack has to drop packets when a receive processing CPU's
322 backlog reaches netdev_max_backlog. If a few out of many active flows
323 generate the vast majority of load, drop their traffic earlier to
324 maintain capacity for the other flows. This feature provides servers
325 with many clients some protection against DoS by a single (spoofed)
326 flow that greatly exceeds average workload.
327
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328menu "Network testing"
329
330config NET_PKTGEN
331 tristate "Packet Generator (USE WITH CAUTION)"
ffd756b3 332 depends on INET && PROC_FS
a7f7f624 333 help
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334 This module will inject preconfigured packets, at a configurable
335 rate, out of a given interface. It is used for network interface
336 stress testing and performance analysis. If you don't understand
337 what was just said, you don't need it: say N.
338
339 Documentation on how to use the packet generator can be found
c1e4535f 340 at <file:Documentation/networking/pktgen.rst>.
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341
342 To compile this code as a module, choose M here: the
343 module will be called pktgen.
344
273ae44b 345config NET_DROP_MONITOR
cad456d5 346 tristate "Network packet drop alerting service"
911f8635 347 depends on INET && TRACEPOINTS
a7f7f624 348 help
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349 This feature provides an alerting service to userspace in the
350 event that packets are discarded in the network stack. Alerts
351 are broadcast via netlink socket to any listening user space
352 process. If you don't need network drop alerts, or if you are ok
353 just checking the various proc files and other utilities for
354 drop statistics, say N here.
273ae44b 355
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356endmenu
357
358endmenu
359
1da177e4 360source "net/ax25/Kconfig"
0d66548a 361source "net/can/Kconfig"
1da177e4 362source "net/bluetooth/Kconfig"
17926a79 363source "net/rxrpc/Kconfig"
ab7ac4eb 364source "net/kcm/Kconfig"
43a0c675 365source "net/strparser/Kconfig"
bc49d816 366source "net/mctp/Kconfig"
d86b5e0e 367
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368config FIB_RULES
369 bool
370
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371menuconfig WIRELESS
372 bool "Wireless"
f54bfc0e 373 depends on !S390
5442060c
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374 default y
375
376if WIRELESS
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377
378source "net/wireless/Kconfig"
f0706e82 379source "net/mac80211/Kconfig"
2a5e1c0e 380
5442060c 381endif # WIRELESS
2a5e1c0e 382
cf4328cd 383source "net/rfkill/Kconfig"
bd238fb4 384source "net/9p/Kconfig"
3908c690 385source "net/caif/Kconfig"
3d14c5d2 386source "net/ceph/Kconfig"
3e256b8f 387source "net/nfc/Kconfig"
6ae0a628 388source "net/psample/Kconfig"
1ce84604 389source "net/ife/Kconfig"
3908c690 390
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391config LWTUNNEL
392 bool "Network light weight tunnels"
a7f7f624 393 help
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394 This feature provides an infrastructure to support light weight
395 tunnels like mpls. There is no netdevice associated with a light
396 weight tunnel endpoint. Tunnel encapsulation parameters are stored
397 with light weight tunnel state associated with fib routes.
cf4328cd 398
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399config LWTUNNEL_BPF
400 bool "Execute BPF program as route nexthop action"
b251f9f6 401 depends on LWTUNNEL && INET
3a0af8fd 402 default y if LWTUNNEL=y
a7f7f624 403 help
3a0af8fd
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404 Allows to run BPF programs as a nexthop action following a route
405 lookup for incoming and outgoing packets.
406
911362c7 407config DST_CACHE
9b246841 408 bool
911362c7
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409 default n
410
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411config GRO_CELLS
412 bool
413 default n
414
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415config SOCK_VALIDATE_XMIT
416 bool
417
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418config NET_SELFTESTS
419 def_tristate PHYLIB
4a52dd8f 420 depends on PHYLIB && INET
3e1e58d6 421
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422config NET_SOCK_MSG
423 bool
424 default n
425 help
426 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
427 ULPs (upper layer modules, e.g. TLS) to process L7 application data
428 with the help of BPF programs.
429
bfcd3a46 430config NET_DEVLINK
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431 bool
432 default n
bfcd3a46 433
ff7d6b27 434config PAGE_POOL
43da1411 435 bool
ff7d6b27 436
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437config FAILOVER
438 tristate "Generic failover module"
439 help
440 The failover module provides a generic interface for paravirtual
441 drivers to register a netdev and a set of ops with a failover
442 instance. The ops are used as event handlers that get called to
443 handle netdev register/unregister/link change/name change events
444 on slave pci ethernet devices with the same mac address as the
445 failover netdev. This enables paravirtual drivers to use a
446 VF as an accelerated low latency datapath. It also allows live
447 migration of VMs with direct attached VFs by failing over to the
448 paravirtual datapath when the VF is unplugged.
449
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450config ETHTOOL_NETLINK
451 bool "Netlink interface for ethtool"
452 default y
453 help
454 An alternative userspace interface for ethtool based on generic
455 netlink. It provides better extensibility and some new features,
456 e.g. notification messages.
457
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458config NETDEV_ADDR_LIST_TEST
459 tristate "Unit tests for device address list"
460 default KUNIT_ALL_TESTS
461 depends on KUNIT
462
6a2e9b73 463endif # if NET