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 NETWORK_PHY_TIMESTAMPING
93 bool "Timestamping in PHY devices"
95 This allows timestamping of network packets by PHYs with
96 hardware timestamping capabilities. This option adds some
97 overhead in the transmit and receive paths.
99 If you are unsure how to answer this question, answer N.
102 bool "Network packet filtering framework (Netfilter)"
104 Netfilter is a framework for filtering and mangling network packets
105 that pass through your Linux box.
107 The most common use of packet filtering is to run your Linux box as
108 a firewall protecting a local network from the Internet. The type of
109 firewall provided by this kernel support is called a "packet
110 filter", which means that it can reject individual network packets
111 based on type, source, destination etc. The other kind of firewall,
112 a "proxy-based" one, is more secure but more intrusive and more
113 bothersome to set up; it inspects the network traffic much more
114 closely, modifies it and has knowledge about the higher level
115 protocols, which a packet filter lacks. Moreover, proxy-based
116 firewalls often require changes to the programs running on the local
117 clients. Proxy-based firewalls don't need support by the kernel, but
118 they are often combined with a packet filter, which only works if
121 You should also say Y here if you intend to use your Linux box as
122 the gateway to the Internet for a local network of machines without
123 globally valid IP addresses. This is called "masquerading": if one
124 of the computers on your local network wants to send something to
125 the outside, your box can "masquerade" as that computer, i.e. it
126 forwards the traffic to the intended outside destination, but
127 modifies the packets to make it look like they came from the
128 firewall box itself. It works both ways: if the outside host
129 replies, the Linux box will silently forward the traffic to the
130 correct local computer. This way, the computers on your local net
131 are completely invisible to the outside world, even though they can
132 reach the outside and can receive replies. It is even possible to
133 run globally visible servers from within a masqueraded local network
134 using a mechanism called portforwarding. Masquerading is also often
135 called NAT (Network Address Translation).
137 Another use of Netfilter is in transparent proxying: if a machine on
138 the local network tries to connect to an outside host, your Linux
139 box can transparently forward the traffic to a local server,
140 typically a caching proxy server.
142 Yet another use of Netfilter is building a bridging firewall. Using
143 a bridge with Network packet filtering enabled makes iptables "see"
144 the bridged traffic. For filtering on the lower network and Ethernet
145 protocols over the bridge, use ebtables (under bridge netfilter
148 Various modules exist for netfilter which replace the previous
149 masquerading (ipmasqadm), packet filtering (ipchains), transparent
150 proxying, and portforwarding mechanisms. Please see
151 <file:Documentation/Changes> under "iptables" for the location of
156 config NETFILTER_DEBUG
157 bool "Network packet filtering debugging"
160 You can say Y here if you want to get additional messages useful in
161 debugging the netfilter code.
163 config NETFILTER_ADVANCED
164 bool "Advanced netfilter configuration"
168 If you say Y here you can select between all the netfilter modules.
169 If you say N the more unusual ones will not be shown and the
170 basic ones needed by most people will default to 'M'.
174 config BRIDGE_NETFILTER
175 bool "Bridged IP/ARP packets filtering"
176 depends on BRIDGE && NETFILTER && INET
177 depends on NETFILTER_ADVANCED
180 Enabling this option will let arptables resp. iptables see bridged
181 ARP resp. IP traffic. If you want a bridging firewall, you probably
182 want this option enabled.
183 Enabling or disabling this option doesn't enable or disable
188 source "net/netfilter/Kconfig"
189 source "net/ipv4/netfilter/Kconfig"
190 source "net/ipv6/netfilter/Kconfig"
191 source "net/decnet/netfilter/Kconfig"
192 source "net/bridge/netfilter/Kconfig"
196 source "net/dccp/Kconfig"
197 source "net/sctp/Kconfig"
198 source "net/rds/Kconfig"
199 source "net/tipc/Kconfig"
200 source "net/atm/Kconfig"
201 source "net/l2tp/Kconfig"
202 source "net/802/Kconfig"
203 source "net/bridge/Kconfig"
204 source "net/dsa/Kconfig"
205 source "net/8021q/Kconfig"
206 source "net/decnet/Kconfig"
207 source "net/llc/Kconfig"
208 source "net/ipx/Kconfig"
209 source "drivers/net/appletalk/Kconfig"
210 source "net/x25/Kconfig"
211 source "net/lapb/Kconfig"
212 source "net/phonet/Kconfig"
213 source "net/ieee802154/Kconfig"
214 source "net/mac802154/Kconfig"
215 source "net/sched/Kconfig"
216 source "net/dcb/Kconfig"
217 source "net/dns_resolver/Kconfig"
218 source "net/batman-adv/Kconfig"
219 source "net/openvswitch/Kconfig"
220 source "net/vmw_vsock/Kconfig"
221 source "net/netlink/Kconfig"
222 source "net/mpls/Kconfig"
223 source "net/hsr/Kconfig"
227 depends on SMP && SYSFS
241 config NETPRIO_CGROUP
242 tristate "Network priority cgroup"
245 Cgroup subsystem for use in assigning processes to network priorities on
246 a per-interface basis
248 config NET_RX_BUSY_POLL
259 bool "enable BPF Just In Time compiler"
260 depends on HAVE_BPF_JIT
263 Berkeley Packet Filter filtering capabilities are normally handled
264 by an interpreter. This option allows kernel to generate a native
265 code when filter is loaded in memory. This should speedup
266 packet sniffing (libpcap/tcpdump). Note : Admin should enable
267 this feature changing /proc/sys/net/core/bpf_jit_enable
269 config NET_FLOW_LIMIT
274 The network stack has to drop packets when a receive processing CPU's
275 backlog reaches netdev_max_backlog. If a few out of many active flows
276 generate the vast majority of load, drop their traffic earlier to
277 maintain capacity for the other flows. This feature provides servers
278 with many clients some protection against DoS by a single (spoofed)
279 flow that greatly exceeds average workload.
281 menu "Network testing"
284 tristate "Packet Generator (USE WITH CAUTION)"
285 depends on INET && PROC_FS
287 This module will inject preconfigured packets, at a configurable
288 rate, out of a given interface. It is used for network interface
289 stress testing and performance analysis. If you don't understand
290 what was just said, you don't need it: say N.
292 Documentation on how to use the packet generator can be found
293 at <file:Documentation/networking/pktgen.txt>.
295 To compile this code as a module, choose M here: the
296 module will be called pktgen.
299 tristate "TCP connection probing"
300 depends on INET && PROC_FS && KPROBES
302 This module allows for capturing the changes to TCP connection
303 state in response to incoming packets. It is used for debugging
304 TCP congestion avoidance modules. If you don't understand
305 what was just said, you don't need it: say N.
307 Documentation on how to use TCP connection probing can be found
310 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
312 To compile this code as a module, choose M here: the
313 module will be called tcp_probe.
315 config NET_DROP_MONITOR
316 tristate "Network packet drop alerting service"
317 depends on INET && TRACEPOINTS
319 This feature provides an alerting service to userspace in the
320 event that packets are discarded in the network stack. Alerts
321 are broadcast via netlink socket to any listening user space
322 process. If you don't need network drop alerts, or if you are ok
323 just checking the various proc files and other utilities for
324 drop statistics, say N here.
330 source "net/ax25/Kconfig"
331 source "net/can/Kconfig"
332 source "net/irda/Kconfig"
333 source "net/bluetooth/Kconfig"
334 source "net/rxrpc/Kconfig"
346 source "net/wireless/Kconfig"
347 source "net/mac80211/Kconfig"
351 source "net/wimax/Kconfig"
353 source "net/rfkill/Kconfig"
354 source "net/9p/Kconfig"
355 source "net/caif/Kconfig"
356 source "net/ceph/Kconfig"
357 source "net/nfc/Kconfig"
362 # Used by archs to tell that they support BPF_JIT