xref: /openbmc/linux/net/Kconfig (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1#
2# Network configuration
3#
4
5menu "Networking"
6
7config NET
8	bool "Networking support"
9	---help---
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
13	  other computer.
14
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>.
20
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>.
24
25# Make sure that all config symbols are dependent on NET
26if NET
27
28menu "Networking options"
29
30source "net/packet/Kconfig"
31source "net/unix/Kconfig"
32source "net/xfrm/Kconfig"
33
34config INET
35	bool "TCP/IP networking"
36	---help---
37	  These are the protocols used on the Internet and on most local
38	  Ethernets. It is highly recommended to say Y here (this will enlarge
39	  your kernel by about 144 KB), since some programs (e.g. the X window
40	  system) use TCP/IP even if your machine is not connected to any
41	  other computer. You will get the so-called loopback device which
42	  allows you to ping yourself (great fun, that!).
43
44	  For an excellent introduction to Linux networking, please read the
45	  Linux Networking HOWTO, available from
46	  <http://www.tldp.org/docs.html#howto>.
47
48	  If you say Y here and also to "/proc file system support" and
49	  "Sysctl support" below, you can change various aspects of the
50	  behavior of the TCP/IP code by writing to the (virtual) files in
51	  /proc/sys/net/ipv4/*; the options are explained in the file
52	  <file:Documentation/networking/ip-sysctl.txt>.
53
54	  Short answer: say Y.
55
56if INET
57source "net/ipv4/Kconfig"
58source "net/ipv6/Kconfig"
59
60endif # if INET
61
62menuconfig NETFILTER
63	bool "Network packet filtering (replaces ipchains)"
64	---help---
65	  Netfilter is a framework for filtering and mangling network packets
66	  that pass through your Linux box.
67
68	  The most common use of packet filtering is to run your Linux box as
69	  a firewall protecting a local network from the Internet. The type of
70	  firewall provided by this kernel support is called a "packet
71	  filter", which means that it can reject individual network packets
72	  based on type, source, destination etc. The other kind of firewall,
73	  a "proxy-based" one, is more secure but more intrusive and more
74	  bothersome to set up; it inspects the network traffic much more
75	  closely, modifies it and has knowledge about the higher level
76	  protocols, which a packet filter lacks. Moreover, proxy-based
77	  firewalls often require changes to the programs running on the local
78	  clients. Proxy-based firewalls don't need support by the kernel, but
79	  they are often combined with a packet filter, which only works if
80	  you say Y here.
81
82	  You should also say Y here if you intend to use your Linux box as
83	  the gateway to the Internet for a local network of machines without
84	  globally valid IP addresses. This is called "masquerading": if one
85	  of the computers on your local network wants to send something to
86	  the outside, your box can "masquerade" as that computer, i.e. it
87	  forwards the traffic to the intended outside destination, but
88	  modifies the packets to make it look like they came from the
89	  firewall box itself. It works both ways: if the outside host
90	  replies, the Linux box will silently forward the traffic to the
91	  correct local computer. This way, the computers on your local net
92	  are completely invisible to the outside world, even though they can
93	  reach the outside and can receive replies. It is even possible to
94	  run globally visible servers from within a masqueraded local network
95	  using a mechanism called portforwarding. Masquerading is also often
96	  called NAT (Network Address Translation).
97
98	  Another use of Netfilter is in transparent proxying: if a machine on
99	  the local network tries to connect to an outside host, your Linux
100	  box can transparently forward the traffic to a local server,
101	  typically a caching proxy server.
102
103	  Yet another use of Netfilter is building a bridging firewall. Using
104	  a bridge with Network packet filtering enabled makes iptables "see"
105	  the bridged traffic. For filtering on the lower network and Ethernet
106	  protocols over the bridge, use ebtables (under bridge netfilter
107	  configuration).
108
109	  Various modules exist for netfilter which replace the previous
110	  masquerading (ipmasqadm), packet filtering (ipchains), transparent
111	  proxying, and portforwarding mechanisms. Please see
112	  <file:Documentation/Changes> under "iptables" for the location of
113	  these packages.
114
115	  Make sure to say N to "Fast switching" below if you intend to say Y
116	  here, as Fast switching currently bypasses netfilter.
117
118	  Chances are that you should say Y here if you compile a kernel which
119	  will run as a router and N for regular hosts. If unsure, say N.
120
121if NETFILTER
122
123config NETFILTER_DEBUG
124	bool "Network packet filtering debugging"
125	depends on NETFILTER
126	help
127	  You can say Y here if you want to get additional messages useful in
128	  debugging the netfilter code.
129
130config BRIDGE_NETFILTER
131	bool "Bridged IP/ARP packets filtering"
132	depends on BRIDGE && NETFILTER && INET
133	default y
134	---help---
135	  Enabling this option will let arptables resp. iptables see bridged
136	  ARP resp. IP traffic. If you want a bridging firewall, you probably
137	  want this option enabled.
138	  Enabling or disabling this option doesn't enable or disable
139	  ebtables.
140
141	  If unsure, say N.
142
143source "net/netfilter/Kconfig"
144source "net/ipv4/netfilter/Kconfig"
145source "net/ipv6/netfilter/Kconfig"
146source "net/decnet/netfilter/Kconfig"
147source "net/bridge/netfilter/Kconfig"
148
149endif
150
151source "net/dccp/Kconfig"
152source "net/sctp/Kconfig"
153source "net/atm/Kconfig"
154source "net/bridge/Kconfig"
155source "net/8021q/Kconfig"
156source "net/decnet/Kconfig"
157source "net/llc/Kconfig"
158source "net/ipx/Kconfig"
159source "drivers/net/appletalk/Kconfig"
160source "net/x25/Kconfig"
161source "net/lapb/Kconfig"
162
163config NET_DIVERT
164	bool "Frame Diverter (EXPERIMENTAL)"
165	depends on EXPERIMENTAL
166	---help---
167	  The Frame Diverter allows you to divert packets from the
168	  network, that are not aimed at the interface receiving it (in
169	  promisc. mode). Typically, a Linux box setup as an Ethernet bridge
170	  with the Frames Diverter on, can do some *really* transparent www
171	  caching using a Squid proxy for example.
172
173	  This is very useful when you don't want to change your router's
174	  config (or if you simply don't have access to it).
175
176	  The other possible usages of diverting Ethernet Frames are
177	  numberous:
178	  - reroute smtp traffic to another interface
179	  - traffic-shape certain network streams
180	  - transparently proxy smtp connections
181	  - etc...
182
183	  For more informations, please refer to:
184	  <http://diverter.sourceforge.net/>
185	  <http://perso.wanadoo.fr/magpie/EtherDivert.html>
186
187	  If unsure, say N.
188
189source "net/econet/Kconfig"
190source "net/wanrouter/Kconfig"
191source "net/sched/Kconfig"
192
193menu "Network testing"
194
195config NET_PKTGEN
196	tristate "Packet Generator (USE WITH CAUTION)"
197	depends on PROC_FS
198	---help---
199	  This module will inject preconfigured packets, at a configurable
200	  rate, out of a given interface.  It is used for network interface
201	  stress testing and performance analysis.  If you don't understand
202	  what was just said, you don't need it: say N.
203
204	  Documentation on how to use the packet generator can be found
205	  at <file:Documentation/networking/pktgen.txt>.
206
207	  To compile this code as a module, choose M here: the
208	  module will be called pktgen.
209
210endmenu
211
212endmenu
213
214source "net/ax25/Kconfig"
215source "net/irda/Kconfig"
216source "net/bluetooth/Kconfig"
217source "net/ieee80211/Kconfig"
218
219endif   # if NET
220endmenu # Networking
221
222