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/ieee802154/Kconfig"
218 source "net/mac802154/Kconfig"
219 source "net/sched/Kconfig"
220 source "net/dcb/Kconfig"
221 source "net/dns_resolver/Kconfig"
222 source "net/batman-adv/Kconfig"
223 source "net/openvswitch/Kconfig"
224 source "net/vmw_vsock/Kconfig"
225 source "net/netlink/Kconfig"
226 source "net/mpls/Kconfig"
227 source "net/hsr/Kconfig"
231 depends on SMP && SYSFS
245 config CGROUP_NET_PRIO
246 bool "Network priority cgroup"
249 Cgroup subsystem for use in assigning processes to network priorities on
250 a per-interface basis.
252 config CGROUP_NET_CLASSID
253 boolean "Network classid cgroup"
256 Cgroup subsystem for use as general purpose socket classid marker that is
257 being used in cls_cgroup and for netfilter matching.
259 config NET_RX_BUSY_POLL
270 bool "enable BPF Just In Time compiler"
271 depends on HAVE_BPF_JIT
274 Berkeley Packet Filter filtering capabilities are normally handled
275 by an interpreter. This option allows kernel to generate a native
276 code when filter is loaded in memory. This should speedup
277 packet sniffing (libpcap/tcpdump). Note : Admin should enable
278 this feature changing /proc/sys/net/core/bpf_jit_enable
280 config NET_FLOW_LIMIT
285 The network stack has to drop packets when a receive processing CPU's
286 backlog reaches netdev_max_backlog. If a few out of many active flows
287 generate the vast majority of load, drop their traffic earlier to
288 maintain capacity for the other flows. This feature provides servers
289 with many clients some protection against DoS by a single (spoofed)
290 flow that greatly exceeds average workload.
292 menu "Network testing"
295 tristate "Packet Generator (USE WITH CAUTION)"
296 depends on INET && PROC_FS
298 This module will inject preconfigured packets, at a configurable
299 rate, out of a given interface. It is used for network interface
300 stress testing and performance analysis. If you don't understand
301 what was just said, you don't need it: say N.
303 Documentation on how to use the packet generator can be found
304 at <file:Documentation/networking/pktgen.txt>.
306 To compile this code as a module, choose M here: the
307 module will be called pktgen.
310 tristate "TCP connection probing"
311 depends on INET && PROC_FS && KPROBES
313 This module allows for capturing the changes to TCP connection
314 state in response to incoming packets. It is used for debugging
315 TCP congestion avoidance modules. If you don't understand
316 what was just said, you don't need it: say N.
318 Documentation on how to use TCP connection probing can be found
321 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
323 To compile this code as a module, choose M here: the
324 module will be called tcp_probe.
326 config NET_DROP_MONITOR
327 tristate "Network packet drop alerting service"
328 depends on INET && TRACEPOINTS
330 This feature provides an alerting service to userspace in the
331 event that packets are discarded in the network stack. Alerts
332 are broadcast via netlink socket to any listening user space
333 process. If you don't need network drop alerts, or if you are ok
334 just checking the various proc files and other utilities for
335 drop statistics, say N here.
341 source "net/ax25/Kconfig"
342 source "net/can/Kconfig"
343 source "net/irda/Kconfig"
344 source "net/bluetooth/Kconfig"
345 source "net/rxrpc/Kconfig"
357 source "net/wireless/Kconfig"
358 source "net/mac80211/Kconfig"
362 source "net/wimax/Kconfig"
364 source "net/rfkill/Kconfig"
365 source "net/9p/Kconfig"
366 source "net/caif/Kconfig"
367 source "net/ceph/Kconfig"
368 source "net/nfc/Kconfig"
373 # Used by archs to tell that they support BPF_JIT