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!
48 menu "Networking options"
50 source "net/packet/Kconfig"
51 source "net/unix/Kconfig"
52 source "net/xfrm/Kconfig"
53 source "net/iucv/Kconfig"
56 bool "TCP/IP networking"
60 These are the protocols used on the Internet and on most local
61 Ethernets. It is highly recommended to say Y here (this will enlarge
62 your kernel by about 400 KB), since some programs (e.g. the X window
63 system) use TCP/IP even if your machine is not connected to any
64 other computer. You will get the so-called loopback device which
65 allows you to ping yourself (great fun, that!).
67 For an excellent introduction to Linux networking, please read the
68 Linux Networking HOWTO, available from
69 <http://www.tldp.org/docs.html#howto>.
71 If you say Y here and also to "/proc file system support" and
72 "Sysctl support" below, you can change various aspects of the
73 behavior of the TCP/IP code by writing to the (virtual) files in
74 /proc/sys/net/ipv4/*; the options are explained in the file
75 <file:Documentation/networking/ip-sysctl.txt>.
80 source "net/ipv4/Kconfig"
81 source "net/ipv6/Kconfig"
82 source "net/netlabel/Kconfig"
86 config NETWORK_SECMARK
87 bool "Security Marking"
89 This enables security marking of network packets, similar
90 to nfmark, but designated for security purposes.
91 If you are unsure how to answer this question, answer N.
93 config NET_PTP_CLASSIFY
96 config NETWORK_PHY_TIMESTAMPING
97 bool "Timestamping in PHY devices"
98 select NET_PTP_CLASSIFY
100 This allows timestamping of network packets by PHYs with
101 hardware timestamping capabilities. This option adds some
102 overhead in the transmit and receive paths.
104 If you are unsure how to answer this question, answer N.
107 bool "Network packet filtering framework (Netfilter)"
109 Netfilter is a framework for filtering and mangling network packets
110 that pass through your Linux box.
112 The most common use of packet filtering is to run your Linux box as
113 a firewall protecting a local network from the Internet. The type of
114 firewall provided by this kernel support is called a "packet
115 filter", which means that it can reject individual network packets
116 based on type, source, destination etc. The other kind of firewall,
117 a "proxy-based" one, is more secure but more intrusive and more
118 bothersome to set up; it inspects the network traffic much more
119 closely, modifies it and has knowledge about the higher level
120 protocols, which a packet filter lacks. Moreover, proxy-based
121 firewalls often require changes to the programs running on the local
122 clients. Proxy-based firewalls don't need support by the kernel, but
123 they are often combined with a packet filter, which only works if
126 You should also say Y here if you intend to use your Linux box as
127 the gateway to the Internet for a local network of machines without
128 globally valid IP addresses. This is called "masquerading": if one
129 of the computers on your local network wants to send something to
130 the outside, your box can "masquerade" as that computer, i.e. it
131 forwards the traffic to the intended outside destination, but
132 modifies the packets to make it look like they came from the
133 firewall box itself. It works both ways: if the outside host
134 replies, the Linux box will silently forward the traffic to the
135 correct local computer. This way, the computers on your local net
136 are completely invisible to the outside world, even though they can
137 reach the outside and can receive replies. It is even possible to
138 run globally visible servers from within a masqueraded local network
139 using a mechanism called portforwarding. Masquerading is also often
140 called NAT (Network Address Translation).
142 Another use of Netfilter is in transparent proxying: if a machine on
143 the local network tries to connect to an outside host, your Linux
144 box can transparently forward the traffic to a local server,
145 typically a caching proxy server.
147 Yet another use of Netfilter is building a bridging firewall. Using
148 a bridge with Network packet filtering enabled makes iptables "see"
149 the bridged traffic. For filtering on the lower network and Ethernet
150 protocols over the bridge, use ebtables (under bridge netfilter
153 Various modules exist for netfilter which replace the previous
154 masquerading (ipmasqadm), packet filtering (ipchains), transparent
155 proxying, and portforwarding mechanisms. Please see
156 <file:Documentation/Changes> under "iptables" for the location of
161 config NETFILTER_DEBUG
162 bool "Network packet filtering debugging"
165 You can say Y here if you want to get additional messages useful in
166 debugging the netfilter code.
168 config NETFILTER_ADVANCED
169 bool "Advanced netfilter configuration"
173 If you say Y here you can select between all the netfilter modules.
174 If you say N the more unusual ones will not be shown and the
175 basic ones needed by most people will default to 'M'.
179 config BRIDGE_NETFILTER
180 tristate "Bridged IP/ARP packets filtering"
182 depends on NETFILTER && INET
183 depends on NETFILTER_ADVANCED
186 Enabling this option will let arptables resp. iptables see bridged
187 ARP resp. IP traffic. If you want a bridging firewall, you probably
188 want this option enabled.
189 Enabling or disabling this option doesn't enable or disable
194 source "net/netfilter/Kconfig"
195 source "net/ipv4/netfilter/Kconfig"
196 source "net/ipv6/netfilter/Kconfig"
197 source "net/decnet/netfilter/Kconfig"
198 source "net/bridge/netfilter/Kconfig"
202 source "net/dccp/Kconfig"
203 source "net/sctp/Kconfig"
204 source "net/rds/Kconfig"
205 source "net/tipc/Kconfig"
206 source "net/atm/Kconfig"
207 source "net/l2tp/Kconfig"
208 source "net/802/Kconfig"
209 source "net/bridge/Kconfig"
210 source "net/dsa/Kconfig"
211 source "net/8021q/Kconfig"
212 source "net/decnet/Kconfig"
213 source "net/llc/Kconfig"
214 source "net/ipx/Kconfig"
215 source "drivers/net/appletalk/Kconfig"
216 source "net/x25/Kconfig"
217 source "net/lapb/Kconfig"
218 source "net/phonet/Kconfig"
219 source "net/6lowpan/Kconfig"
220 source "net/ieee802154/Kconfig"
221 source "net/mac802154/Kconfig"
222 source "net/sched/Kconfig"
223 source "net/dcb/Kconfig"
224 source "net/dns_resolver/Kconfig"
225 source "net/batman-adv/Kconfig"
226 source "net/openvswitch/Kconfig"
227 source "net/vmw_vsock/Kconfig"
228 source "net/netlink/Kconfig"
229 source "net/mpls/Kconfig"
230 source "net/hsr/Kconfig"
231 source "net/switchdev/Kconfig"
235 depends on SMP && SYSFS
249 config CGROUP_NET_PRIO
250 bool "Network priority cgroup"
253 Cgroup subsystem for use in assigning processes to network priorities on
254 a per-interface basis.
256 config CGROUP_NET_CLASSID
257 bool "Network classid cgroup"
260 Cgroup subsystem for use as general purpose socket classid marker that is
261 being used in cls_cgroup and for netfilter matching.
263 config NET_RX_BUSY_POLL
274 bool "enable BPF Just In Time compiler"
275 depends on HAVE_BPF_JIT
278 Berkeley Packet Filter filtering capabilities are normally handled
279 by an interpreter. This option allows kernel to generate a native
280 code when filter is loaded in memory. This should speedup
281 packet sniffing (libpcap/tcpdump). Note : Admin should enable
282 this feature changing /proc/sys/net/core/bpf_jit_enable
284 config NET_FLOW_LIMIT
289 The network stack has to drop packets when a receive processing CPU's
290 backlog reaches netdev_max_backlog. If a few out of many active flows
291 generate the vast majority of load, drop their traffic earlier to
292 maintain capacity for the other flows. This feature provides servers
293 with many clients some protection against DoS by a single (spoofed)
294 flow that greatly exceeds average workload.
296 menu "Network testing"
299 tristate "Packet Generator (USE WITH CAUTION)"
300 depends on INET && PROC_FS
302 This module will inject preconfigured packets, at a configurable
303 rate, out of a given interface. It is used for network interface
304 stress testing and performance analysis. If you don't understand
305 what was just said, you don't need it: say N.
307 Documentation on how to use the packet generator can be found
308 at <file:Documentation/networking/pktgen.txt>.
310 To compile this code as a module, choose M here: the
311 module will be called pktgen.
314 tristate "TCP connection probing"
315 depends on INET && PROC_FS && KPROBES
317 This module allows for capturing the changes to TCP connection
318 state in response to incoming packets. It is used for debugging
319 TCP congestion avoidance modules. If you don't understand
320 what was just said, you don't need it: say N.
322 Documentation on how to use TCP connection probing can be found
325 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
327 To compile this code as a module, choose M here: the
328 module will be called tcp_probe.
330 config NET_DROP_MONITOR
331 tristate "Network packet drop alerting service"
332 depends on INET && TRACEPOINTS
334 This feature provides an alerting service to userspace in the
335 event that packets are discarded in the network stack. Alerts
336 are broadcast via netlink socket to any listening user space
337 process. If you don't need network drop alerts, or if you are ok
338 just checking the various proc files and other utilities for
339 drop statistics, say N here.
345 source "net/ax25/Kconfig"
346 source "net/can/Kconfig"
347 source "net/irda/Kconfig"
348 source "net/bluetooth/Kconfig"
349 source "net/rxrpc/Kconfig"
361 source "net/wireless/Kconfig"
362 source "net/mac80211/Kconfig"
366 source "net/wimax/Kconfig"
368 source "net/rfkill/Kconfig"
369 source "net/9p/Kconfig"
370 source "net/caif/Kconfig"
371 source "net/ceph/Kconfig"
372 source "net/nfc/Kconfig"
377 # Used by archs to tell that they support BPF_JIT