2 # Network configuration
6 bool "Networking support"
8 select GENERIC_NET_UTILS
10 Unless you really know what you are doing, you should say Y here.
11 The reason is that some programs need kernel networking support even
12 when running on a stand-alone machine that isn't connected to any
15 If you are upgrading from an older kernel, you
16 should consider updating your networking tools too because changes
17 in the kernel and the tools often go hand in hand. The tools are
18 contained in the package net-tools, the location and version number
19 of which are given in <file:Documentation/Changes>.
21 For a general introduction to Linux networking, it is highly
22 recommended to read the NET-HOWTO, available from
23 <http://www.tldp.org/docs.html#howto>.
27 config WANT_COMPAT_NETLINK_MESSAGES
30 This option can be selected by other options that need compat
33 config COMPAT_NETLINK_MESSAGES
36 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
38 This option makes it possible to send different netlink messages
39 to tasks depending on whether the task is a compat task or not. To
40 achieve this, you need to set skb_shinfo(skb)->frag_list to the
41 compat skb before sending the skb, the netlink code will sort out
42 which message to actually pass to the task.
44 Newly written code should NEVER need this option but do
45 compat-independent messages instead!
47 menu "Networking options"
49 source "net/packet/Kconfig"
50 source "net/unix/Kconfig"
51 source "net/xfrm/Kconfig"
52 source "net/iucv/Kconfig"
55 bool "TCP/IP networking"
59 These are the protocols used on the Internet and on most local
60 Ethernets. It is highly recommended to say Y here (this will enlarge
61 your kernel by about 400 KB), since some programs (e.g. the X window
62 system) use TCP/IP even if your machine is not connected to any
63 other computer. You will get the so-called loopback device which
64 allows you to ping yourself (great fun, that!).
66 For an excellent introduction to Linux networking, please read the
67 Linux Networking HOWTO, available from
68 <http://www.tldp.org/docs.html#howto>.
70 If you say Y here and also to "/proc file system support" and
71 "Sysctl support" below, you can change various aspects of the
72 behavior of the TCP/IP code by writing to the (virtual) files in
73 /proc/sys/net/ipv4/*; the options are explained in the file
74 <file:Documentation/networking/ip-sysctl.txt>.
79 source "net/ipv4/Kconfig"
80 source "net/ipv6/Kconfig"
81 source "net/netlabel/Kconfig"
85 config NETWORK_SECMARK
86 bool "Security Marking"
88 This enables security marking of network packets, similar
89 to nfmark, but designated for security purposes.
90 If you are unsure how to answer this question, answer N.
92 config NET_PTP_CLASSIFY
95 config NETWORK_PHY_TIMESTAMPING
96 bool "Timestamping in PHY devices"
97 select NET_PTP_CLASSIFY
99 This allows timestamping of network packets by PHYs with
100 hardware timestamping capabilities. This option adds some
101 overhead in the transmit and receive paths.
103 If you are unsure how to answer this question, answer N.
106 bool "Network packet filtering framework (Netfilter)"
108 Netfilter is a framework for filtering and mangling network packets
109 that pass through your Linux box.
111 The most common use of packet filtering is to run your Linux box as
112 a firewall protecting a local network from the Internet. The type of
113 firewall provided by this kernel support is called a "packet
114 filter", which means that it can reject individual network packets
115 based on type, source, destination etc. The other kind of firewall,
116 a "proxy-based" one, is more secure but more intrusive and more
117 bothersome to set up; it inspects the network traffic much more
118 closely, modifies it and has knowledge about the higher level
119 protocols, which a packet filter lacks. Moreover, proxy-based
120 firewalls often require changes to the programs running on the local
121 clients. Proxy-based firewalls don't need support by the kernel, but
122 they are often combined with a packet filter, which only works if
125 You should also say Y here if you intend to use your Linux box as
126 the gateway to the Internet for a local network of machines without
127 globally valid IP addresses. This is called "masquerading": if one
128 of the computers on your local network wants to send something to
129 the outside, your box can "masquerade" as that computer, i.e. it
130 forwards the traffic to the intended outside destination, but
131 modifies the packets to make it look like they came from the
132 firewall box itself. It works both ways: if the outside host
133 replies, the Linux box will silently forward the traffic to the
134 correct local computer. This way, the computers on your local net
135 are completely invisible to the outside world, even though they can
136 reach the outside and can receive replies. It is even possible to
137 run globally visible servers from within a masqueraded local network
138 using a mechanism called portforwarding. Masquerading is also often
139 called NAT (Network Address Translation).
141 Another use of Netfilter is in transparent proxying: if a machine on
142 the local network tries to connect to an outside host, your Linux
143 box can transparently forward the traffic to a local server,
144 typically a caching proxy server.
146 Yet another use of Netfilter is building a bridging firewall. Using
147 a bridge with Network packet filtering enabled makes iptables "see"
148 the bridged traffic. For filtering on the lower network and Ethernet
149 protocols over the bridge, use ebtables (under bridge netfilter
152 Various modules exist for netfilter which replace the previous
153 masquerading (ipmasqadm), packet filtering (ipchains), transparent
154 proxying, and portforwarding mechanisms. Please see
155 <file:Documentation/Changes> under "iptables" for the location of
160 config NETFILTER_DEBUG
161 bool "Network packet filtering debugging"
164 You can say Y here if you want to get additional messages useful in
165 debugging the netfilter code.
167 config NETFILTER_ADVANCED
168 bool "Advanced netfilter configuration"
172 If you say Y here you can select between all the netfilter modules.
173 If you say N the more unusual ones will not be shown and the
174 basic ones needed by most people will default to 'M'.
178 config BRIDGE_NETFILTER
179 bool "Bridged IP/ARP packets filtering"
180 depends on BRIDGE && NETFILTER && INET
181 depends on NETFILTER_ADVANCED
184 Enabling this option will let arptables resp. iptables see bridged
185 ARP resp. IP traffic. If you want a bridging firewall, you probably
186 want this option enabled.
187 Enabling or disabling this option doesn't enable or disable
192 source "net/netfilter/Kconfig"
193 source "net/ipv4/netfilter/Kconfig"
194 source "net/ipv6/netfilter/Kconfig"
195 source "net/decnet/netfilter/Kconfig"
196 source "net/bridge/netfilter/Kconfig"
200 source "net/dccp/Kconfig"
201 source "net/sctp/Kconfig"
202 source "net/rds/Kconfig"
203 source "net/tipc/Kconfig"
204 source "net/atm/Kconfig"
205 source "net/l2tp/Kconfig"
206 source "net/802/Kconfig"
207 source "net/bridge/Kconfig"
208 source "net/dsa/Kconfig"
209 source "net/8021q/Kconfig"
210 source "net/decnet/Kconfig"
211 source "net/llc/Kconfig"
212 source "net/ipx/Kconfig"
213 source "drivers/net/appletalk/Kconfig"
214 source "net/x25/Kconfig"
215 source "net/lapb/Kconfig"
216 source "net/phonet/Kconfig"
217 source "net/6lowpan/Kconfig"
218 source "net/ieee802154/Kconfig"
219 source "net/mac802154/Kconfig"
220 source "net/sched/Kconfig"
221 source "net/dcb/Kconfig"
222 source "net/dns_resolver/Kconfig"
223 source "net/batman-adv/Kconfig"
224 source "net/openvswitch/Kconfig"
225 source "net/vmw_vsock/Kconfig"
226 source "net/netlink/Kconfig"
227 source "net/mpls/Kconfig"
228 source "net/hsr/Kconfig"
232 depends on SMP && SYSFS
246 config CGROUP_NET_PRIO
247 bool "Network priority cgroup"
250 Cgroup subsystem for use in assigning processes to network priorities on
251 a per-interface basis.
253 config CGROUP_NET_CLASSID
254 boolean "Network classid cgroup"
257 Cgroup subsystem for use as general purpose socket classid marker that is
258 being used in cls_cgroup and for netfilter matching.
260 config NET_RX_BUSY_POLL
271 bool "enable BPF Just In Time compiler"
272 depends on HAVE_BPF_JIT
275 Berkeley Packet Filter filtering capabilities are normally handled
276 by an interpreter. This option allows kernel to generate a native
277 code when filter is loaded in memory. This should speedup
278 packet sniffing (libpcap/tcpdump). Note : Admin should enable
279 this feature changing /proc/sys/net/core/bpf_jit_enable
281 config NET_FLOW_LIMIT
286 The network stack has to drop packets when a receive processing CPU's
287 backlog reaches netdev_max_backlog. If a few out of many active flows
288 generate the vast majority of load, drop their traffic earlier to
289 maintain capacity for the other flows. This feature provides servers
290 with many clients some protection against DoS by a single (spoofed)
291 flow that greatly exceeds average workload.
293 menu "Network testing"
296 tristate "Packet Generator (USE WITH CAUTION)"
297 depends on INET && PROC_FS
299 This module will inject preconfigured packets, at a configurable
300 rate, out of a given interface. It is used for network interface
301 stress testing and performance analysis. If you don't understand
302 what was just said, you don't need it: say N.
304 Documentation on how to use the packet generator can be found
305 at <file:Documentation/networking/pktgen.txt>.
307 To compile this code as a module, choose M here: the
308 module will be called pktgen.
311 tristate "TCP connection probing"
312 depends on INET && PROC_FS && KPROBES
314 This module allows for capturing the changes to TCP connection
315 state in response to incoming packets. It is used for debugging
316 TCP congestion avoidance modules. If you don't understand
317 what was just said, you don't need it: say N.
319 Documentation on how to use TCP connection probing can be found
322 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
324 To compile this code as a module, choose M here: the
325 module will be called tcp_probe.
327 config NET_DROP_MONITOR
328 tristate "Network packet drop alerting service"
329 depends on INET && TRACEPOINTS
331 This feature provides an alerting service to userspace in the
332 event that packets are discarded in the network stack. Alerts
333 are broadcast via netlink socket to any listening user space
334 process. If you don't need network drop alerts, or if you are ok
335 just checking the various proc files and other utilities for
336 drop statistics, say N here.
342 source "net/ax25/Kconfig"
343 source "net/can/Kconfig"
344 source "net/irda/Kconfig"
345 source "net/bluetooth/Kconfig"
346 source "net/rxrpc/Kconfig"
358 source "net/wireless/Kconfig"
359 source "net/mac80211/Kconfig"
363 source "net/wimax/Kconfig"
365 source "net/rfkill/Kconfig"
366 source "net/9p/Kconfig"
367 source "net/caif/Kconfig"
368 source "net/ceph/Kconfig"
369 source "net/nfc/Kconfig"
374 # Used by archs to tell that they support BPF_JIT