2 # Network configuration
6 bool "Networking support"
8 select GENERIC_NET_UTILS
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
16 If you are upgrading from an older kernel, you
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>.
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>.
28 config WANT_COMPAT_NETLINK_MESSAGES
31 This option can be selected by other options that need compat
34 config COMPAT_NETLINK_MESSAGES
37 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
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.
45 Newly written code should NEVER need this option but do
46 compat-independent messages instead!
57 menu "Networking options"
59 source "net/packet/Kconfig"
60 source "net/unix/Kconfig"
61 source "net/tls/Kconfig"
62 source "net/xfrm/Kconfig"
63 source "net/iucv/Kconfig"
64 source "net/smc/Kconfig"
65 source "net/xdp/Kconfig"
68 bool "TCP/IP networking"
72 These are the protocols used on the Internet and on most local
73 Ethernets. It is highly recommended to say Y here (this will enlarge
74 your kernel by about 400 KB), since some programs (e.g. the X window
75 system) use TCP/IP even if your machine is not connected to any
76 other computer. You will get the so-called loopback device which
77 allows you to ping yourself (great fun, that!).
79 For an excellent introduction to Linux networking, please read the
80 Linux Networking HOWTO, available from
81 <http://www.tldp.org/docs.html#howto>.
83 If you say Y here and also to "/proc file system support" and
84 "Sysctl support" below, you can change various aspects of the
85 behavior of the TCP/IP code by writing to the (virtual) files in
86 /proc/sys/net/ipv4/*; the options are explained in the file
87 <file:Documentation/networking/ip-sysctl.txt>.
92 source "net/ipv4/Kconfig"
93 source "net/ipv6/Kconfig"
94 source "net/netlabel/Kconfig"
98 config NETWORK_SECMARK
99 bool "Security Marking"
101 This enables security marking of network packets, similar
102 to nfmark, but designated for security purposes.
103 If you are unsure how to answer this question, answer N.
105 config NET_PTP_CLASSIFY
108 config NETWORK_PHY_TIMESTAMPING
109 bool "Timestamping in PHY devices"
110 select NET_PTP_CLASSIFY
112 This allows timestamping of network packets by PHYs with
113 hardware timestamping capabilities. This option adds some
114 overhead in the transmit and receive paths.
116 If you are unsure how to answer this question, answer N.
119 bool "Network packet filtering framework (Netfilter)"
121 Netfilter is a framework for filtering and mangling network packets
122 that pass through your Linux box.
124 The most common use of packet filtering is to run your Linux box as
125 a firewall protecting a local network from the Internet. The type of
126 firewall provided by this kernel support is called a "packet
127 filter", which means that it can reject individual network packets
128 based on type, source, destination etc. The other kind of firewall,
129 a "proxy-based" one, is more secure but more intrusive and more
130 bothersome to set up; it inspects the network traffic much more
131 closely, modifies it and has knowledge about the higher level
132 protocols, which a packet filter lacks. Moreover, proxy-based
133 firewalls often require changes to the programs running on the local
134 clients. Proxy-based firewalls don't need support by the kernel, but
135 they are often combined with a packet filter, which only works if
138 You should also say Y here if you intend to use your Linux box as
139 the gateway to the Internet for a local network of machines without
140 globally valid IP addresses. This is called "masquerading": if one
141 of the computers on your local network wants to send something to
142 the outside, your box can "masquerade" as that computer, i.e. it
143 forwards the traffic to the intended outside destination, but
144 modifies the packets to make it look like they came from the
145 firewall box itself. It works both ways: if the outside host
146 replies, the Linux box will silently forward the traffic to the
147 correct local computer. This way, the computers on your local net
148 are completely invisible to the outside world, even though they can
149 reach the outside and can receive replies. It is even possible to
150 run globally visible servers from within a masqueraded local network
151 using a mechanism called portforwarding. Masquerading is also often
152 called NAT (Network Address Translation).
154 Another use of Netfilter is in transparent proxying: if a machine on
155 the local network tries to connect to an outside host, your Linux
156 box can transparently forward the traffic to a local server,
157 typically a caching proxy server.
159 Yet another use of Netfilter is building a bridging firewall. Using
160 a bridge with Network packet filtering enabled makes iptables "see"
161 the bridged traffic. For filtering on the lower network and Ethernet
162 protocols over the bridge, use ebtables (under bridge netfilter
165 Various modules exist for netfilter which replace the previous
166 masquerading (ipmasqadm), packet filtering (ipchains), transparent
167 proxying, and portforwarding mechanisms. Please see
168 <file:Documentation/Changes> under "iptables" for the location of
173 config NETFILTER_ADVANCED
174 bool "Advanced netfilter configuration"
178 If you say Y here you can select between all the netfilter modules.
179 If you say N the more unusual ones will not be shown and the
180 basic ones needed by most people will default to 'M'.
184 config BRIDGE_NETFILTER
185 tristate "Bridged IP/ARP packets filtering"
187 depends on NETFILTER && INET
188 depends on NETFILTER_ADVANCED
189 select NETFILTER_FAMILY_BRIDGE
190 select SKB_EXTENSIONS
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
201 source "net/netfilter/Kconfig"
202 source "net/ipv4/netfilter/Kconfig"
203 source "net/ipv6/netfilter/Kconfig"
204 source "net/decnet/netfilter/Kconfig"
205 source "net/bridge/netfilter/Kconfig"
209 source "net/bpfilter/Kconfig"
211 source "net/dccp/Kconfig"
212 source "net/sctp/Kconfig"
213 source "net/rds/Kconfig"
214 source "net/tipc/Kconfig"
215 source "net/atm/Kconfig"
216 source "net/l2tp/Kconfig"
217 source "net/802/Kconfig"
218 source "net/bridge/Kconfig"
219 source "net/dsa/Kconfig"
220 source "net/8021q/Kconfig"
221 source "net/decnet/Kconfig"
222 source "net/llc/Kconfig"
223 source "drivers/net/appletalk/Kconfig"
224 source "net/x25/Kconfig"
225 source "net/lapb/Kconfig"
226 source "net/phonet/Kconfig"
227 source "net/6lowpan/Kconfig"
228 source "net/ieee802154/Kconfig"
229 source "net/mac802154/Kconfig"
230 source "net/sched/Kconfig"
231 source "net/dcb/Kconfig"
232 source "net/dns_resolver/Kconfig"
233 source "net/batman-adv/Kconfig"
234 source "net/openvswitch/Kconfig"
235 source "net/vmw_vsock/Kconfig"
236 source "net/netlink/Kconfig"
237 source "net/mpls/Kconfig"
238 source "net/nsh/Kconfig"
239 source "net/hsr/Kconfig"
240 source "net/switchdev/Kconfig"
241 source "net/l3mdev/Kconfig"
242 source "net/qrtr/Kconfig"
243 source "net/ncsi/Kconfig"
247 depends on SMP && SYSFS
264 config CGROUP_NET_PRIO
265 bool "Network priority cgroup"
267 select SOCK_CGROUP_DATA
269 Cgroup subsystem for use in assigning processes to network priorities on
270 a per-interface basis.
272 config CGROUP_NET_CLASSID
273 bool "Network classid cgroup"
275 select SOCK_CGROUP_DATA
277 Cgroup subsystem for use as general purpose socket classid marker that is
278 being used in cls_cgroup and for netfilter matching.
280 config NET_RX_BUSY_POLL
291 bool "enable BPF Just In Time compiler"
292 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
295 Berkeley Packet Filter filtering capabilities are normally handled
296 by an interpreter. This option allows kernel to generate a native
297 code when filter is loaded in memory. This should speedup
298 packet sniffing (libpcap/tcpdump).
300 Note, admin should enable this feature changing:
301 /proc/sys/net/core/bpf_jit_enable
302 /proc/sys/net/core/bpf_jit_harden (optional)
303 /proc/sys/net/core/bpf_jit_kallsyms (optional)
305 config BPF_STREAM_PARSER
306 bool "enable BPF STREAM_PARSER"
308 depends on BPF_SYSCALL
309 depends on CGROUP_BPF
313 Enabling this allows a stream parser to be used with
314 BPF_MAP_TYPE_SOCKMAP.
316 BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
317 It can be used to enforce socket policy, implement socket redirects,
320 config NET_FLOW_LIMIT
325 The network stack has to drop packets when a receive processing CPU's
326 backlog reaches netdev_max_backlog. If a few out of many active flows
327 generate the vast majority of load, drop their traffic earlier to
328 maintain capacity for the other flows. This feature provides servers
329 with many clients some protection against DoS by a single (spoofed)
330 flow that greatly exceeds average workload.
332 menu "Network testing"
335 tristate "Packet Generator (USE WITH CAUTION)"
336 depends on INET && PROC_FS
338 This module will inject preconfigured packets, at a configurable
339 rate, out of a given interface. It is used for network interface
340 stress testing and performance analysis. If you don't understand
341 what was just said, you don't need it: say N.
343 Documentation on how to use the packet generator can be found
344 at <file:Documentation/networking/pktgen.txt>.
346 To compile this code as a module, choose M here: the
347 module will be called pktgen.
349 config NET_DROP_MONITOR
350 tristate "Network packet drop alerting service"
351 depends on INET && TRACEPOINTS
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.
364 source "net/ax25/Kconfig"
365 source "net/can/Kconfig"
366 source "net/bluetooth/Kconfig"
367 source "net/rxrpc/Kconfig"
368 source "net/kcm/Kconfig"
369 source "net/strparser/Kconfig"
381 source "net/wireless/Kconfig"
382 source "net/mac80211/Kconfig"
386 source "net/wimax/Kconfig"
388 source "net/rfkill/Kconfig"
389 source "net/9p/Kconfig"
390 source "net/caif/Kconfig"
391 source "net/ceph/Kconfig"
392 source "net/nfc/Kconfig"
393 source "net/psample/Kconfig"
394 source "net/ife/Kconfig"
397 bool "Network light weight tunnels"
399 This feature provides an infrastructure to support light weight
400 tunnels like mpls. There is no netdevice associated with a light
401 weight tunnel endpoint. Tunnel encapsulation parameters are stored
402 with light weight tunnel state associated with fib routes.
405 bool "Execute BPF program as route nexthop action"
406 depends on LWTUNNEL && INET
407 default y if LWTUNNEL=y
409 Allows to run BPF programs as a nexthop action following a route
410 lookup for incoming and outgoing packets.
420 config SOCK_VALIDATE_XMIT
427 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or
428 ULPs (upper layer modules, e.g. TLS) to process L7 application data
429 with the help of BPF programs.
439 tristate "Generic failover module"
441 The failover module provides a generic interface for paravirtual
442 drivers to register a netdev and a set of ops with a failover
443 instance. The ops are used as event handlers that get called to
444 handle netdev register/unregister/link change/name change events
445 on slave pci ethernet devices with the same mac address as the
446 failover netdev. This enables paravirtual drivers to use a
447 VF as an accelerated low latency datapath. It also allows live
448 migration of VMs with direct attached VFs by failing over to the
449 paravirtual datapath when the VF is unplugged.
453 # Used by archs to tell that they support BPF JIT compiler plus which flavour.
454 # Only one of the two can be selected for a specific arch since eBPF JIT supersedes
457 # Classic BPF JIT (cBPF)
461 # Extended BPF JIT (eBPF)