net/Kconfig

   1 #
   2 # Network configuration
   3 #
   4
   5 menu "Networking"
   6
   7 config 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
  26 if NET
  27
  28 menu "Networking options"
  29
  30 config NETDEBUG
  31         bool "Network packet debugging"
  32         help
  33           You can say Y here if you want to get additional messages useful in
  34           debugging bad packets, but can overwhelm logs under denial of service
  35           attacks.
  36
  37 source "net/packet/Kconfig"
  38 source "net/unix/Kconfig"
  39 source "net/xfrm/Kconfig"
  40
  41 config INET
  42         bool "TCP/IP networking"
  43         ---help---
  44           These are the protocols used on the Internet and on most local
  45           Ethernets. It is highly recommended to say Y here (this will enlarge
  46           your kernel by about 144 KB), since some programs (e.g. the X window
  47           system) use TCP/IP even if your machine is not connected to any
  48           other computer. You will get the so-called loopback device which
  49           allows you to ping yourself (great fun, that!).
  50
  51           For an excellent introduction to Linux networking, please read the
  52           Linux Networking HOWTO, available from
  53           <http://www.tldp.org/docs.html#howto>.
  54
  55           If you say Y here and also to "/proc file system support" and
  56           "Sysctl support" below, you can change various aspects of the
  57           behavior of the TCP/IP code by writing to the (virtual) files in
  58           /proc/sys/net/ipv4/*; the options are explained in the file
  59           <file:Documentation/networking/ip-sysctl.txt>.
  60
  61           Short answer: say Y.
  62
  63 if INET
  64 source "net/ipv4/Kconfig"
  65 source "net/ipv6/Kconfig"
  66
  67 endif # if INET
  68
  69 config NETWORK_SECMARK
  70         bool "Security Marking"
  71         help
  72           This enables security marking of network packets, similar
  73           to nfmark, but designated for security purposes.
  74           If you are unsure how to answer this question, answer N.
  75
  76 menuconfig NETFILTER
  77         bool "Network packet filtering (replaces ipchains)"
  78         ---help---
  79           Netfilter is a framework for filtering and mangling network packets
  80           that pass through your Linux box.
  81
  82           The most common use of packet filtering is to run your Linux box as
  83           a firewall protecting a local network from the Internet. The type of
  84           firewall provided by this kernel support is called a "packet
  85           filter", which means that it can reject individual network packets
  86           based on type, source, destination etc. The other kind of firewall,
  87           a "proxy-based" one, is more secure but more intrusive and more
  88           bothersome to set up; it inspects the network traffic much more
  89           closely, modifies it and has knowledge about the higher level
  90           protocols, which a packet filter lacks. Moreover, proxy-based
  91           firewalls often require changes to the programs running on the local
  92           clients. Proxy-based firewalls don't need support by the kernel, but
  93           they are often combined with a packet filter, which only works if
  94           you say Y here.
  95
  96           You should also say Y here if you intend to use your Linux box as
  97           the gateway to the Internet for a local network of machines without
  98           globally valid IP addresses. This is called "masquerading": if one
  99           of the computers on your local network wants to send something to
 100           the outside, your box can "masquerade" as that computer, i.e. it
 101           forwards the traffic to the intended outside destination, but
 102           modifies the packets to make it look like they came from the
 103           firewall box itself. It works both ways: if the outside host
 104           replies, the Linux box will silently forward the traffic to the
 105           correct local computer. This way, the computers on your local net
 106           are completely invisible to the outside world, even though they can
 107           reach the outside and can receive replies. It is even possible to
 108           run globally visible servers from within a masqueraded local network
 109           using a mechanism called portforwarding. Masquerading is also often
 110           called NAT (Network Address Translation).
 111
 112           Another use of Netfilter is in transparent proxying: if a machine on
 113           the local network tries to connect to an outside host, your Linux
 114           box can transparently forward the traffic to a local server,
 115           typically a caching proxy server.
 116
 117           Yet another use of Netfilter is building a bridging firewall. Using
 118           a bridge with Network packet filtering enabled makes iptables "see"
 119           the bridged traffic. For filtering on the lower network and Ethernet
 120           protocols over the bridge, use ebtables (under bridge netfilter
 121           configuration).
 122
 123           Various modules exist for netfilter which replace the previous
 124           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 125           proxying, and portforwarding mechanisms. Please see
 126           <file:Documentation/Changes> under "iptables" for the location of
 127           these packages.
 128
 129           Make sure to say N to "Fast switching" below if you intend to say Y
 130           here, as Fast switching currently bypasses netfilter.
 131
 132           Chances are that you should say Y here if you compile a kernel which
 133           will run as a router and N for regular hosts. If unsure, say N.
 134
 135 if NETFILTER
 136
 137 config NETFILTER_DEBUG
 138         bool "Network packet filtering debugging"
 139         depends on NETFILTER
 140         help
 141           You can say Y here if you want to get additional messages useful in
 142           debugging the netfilter code.
 143
 144 config BRIDGE_NETFILTER
 145         bool "Bridged IP/ARP packets filtering"
 146         depends on BRIDGE && NETFILTER && INET
 147         default y
 148         ---help---
 149           Enabling this option will let arptables resp. iptables see bridged
 150           ARP resp. IP traffic. If you want a bridging firewall, you probably
 151           want this option enabled.
 152           Enabling or disabling this option doesn't enable or disable
 153           ebtables.
 154
 155           If unsure, say N.
 156
 157 source "net/netfilter/Kconfig"
 158 source "net/ipv4/netfilter/Kconfig"
 159 source "net/ipv6/netfilter/Kconfig"
 160 source "net/decnet/netfilter/Kconfig"
 161 source "net/bridge/netfilter/Kconfig"
 162
 163 endif
 164
 165 source "net/dccp/Kconfig"
 166 source "net/sctp/Kconfig"
 167 source "net/tipc/Kconfig"
 168 source "net/atm/Kconfig"
 169 source "net/bridge/Kconfig"
 170 source "net/8021q/Kconfig"
 171 source "net/decnet/Kconfig"
 172 source "net/llc/Kconfig"
 173 source "net/ipx/Kconfig"
 174 source "drivers/net/appletalk/Kconfig"
 175 source "net/x25/Kconfig"
 176 source "net/lapb/Kconfig"
 177
 178 config NET_DIVERT
 179         bool "Frame Diverter (EXPERIMENTAL)"
 180         depends on EXPERIMENTAL && BROKEN
 181         ---help---
 182           The Frame Diverter allows you to divert packets from the
 183           network, that are not aimed at the interface receiving it (in
 184           promisc. mode). Typically, a Linux box setup as an Ethernet bridge
 185           with the Frames Diverter on, can do some *really* transparent www
 186           caching using a Squid proxy for example.
 187
 188           This is very useful when you don't want to change your router's
 189           config (or if you simply don't have access to it).
 190
 191           The other possible usages of diverting Ethernet Frames are
 192           numberous:
 193           - reroute smtp traffic to another interface
 194           - traffic-shape certain network streams
 195           - transparently proxy smtp connections
 196           - etc...
 197
 198           For more informations, please refer to:
 199           <http://diverter.sourceforge.net/>
 200           <http://perso.wanadoo.fr/magpie/EtherDivert.html>
 201
 202           If unsure, say N.
 203
 204 source "net/econet/Kconfig"
 205 source "net/wanrouter/Kconfig"
 206 source "net/sched/Kconfig"
 207
 208 menu "Network testing"
 209
 210 config NET_PKTGEN
 211         tristate "Packet Generator (USE WITH CAUTION)"
 212         depends on PROC_FS
 213         ---help---
 214           This module will inject preconfigured packets, at a configurable
 215           rate, out of a given interface.  It is used for network interface
 216           stress testing and performance analysis.  If you don't understand
 217           what was just said, you don't need it: say N.
 218
 219           Documentation on how to use the packet generator can be found
 220           at <file:Documentation/networking/pktgen.txt>.
 221
 222           To compile this code as a module, choose M here: the
 223           module will be called pktgen.
 224
 225 config NET_TCPPROBE
 226         tristate "TCP connection probing"
 227         depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
 228         ---help---
 229         This module allows for capturing the changes to TCP connection
 230         state in response to incoming packets. It is used for debugging
 231         TCP congestion avoidance modules. If you don't understand
 232         what was just said, you don't need it: say N.
 233
 234         Documentation on how to use the packet generator can be found
 235         at http://linux-net.osdl.org/index.php/TcpProbe
 236
 237         To compile this code as a module, choose M here: the
 238         module will be called tcp_probe.
 239
 240 endmenu
 241
 242 endmenu
 243
 244 source "net/ax25/Kconfig"
 245 source "net/irda/Kconfig"
 246 source "net/bluetooth/Kconfig"
 247 source "net/ieee80211/Kconfig"
 248
 249 config WIRELESS_EXT
 250         bool
 251
 252 source "net/netlabel/Kconfig"
 253
 254 config FIB_RULES
 255         bool
 256
 257 endif   # if NET
 258 endmenu # Networking
 259