net/Kconfig

   1 #
   2 # Network configuration
   3 #
   4
   5 menuconfig NET
   6         bool "Networking support"
   7         select NLATTR
   8         ---help---
   9           Unless you really know what you are doing, you should say Y here.
  10           The reason is that some programs need kernel networking support even
  11           when running on a stand-alone machine that isn't connected to any
  12           other computer.
  13
  14           If you are upgrading from an older kernel, you
  15           should consider updating your networking tools too because changes
  16           in the kernel and the tools often go hand in hand. The tools are
  17           contained in the package net-tools, the location and version number
  18           of which are given in <file:Documentation/Changes>.
  19
  20           For a general introduction to Linux networking, it is highly
  21           recommended to read the NET-HOWTO, available from
  22           <http://www.tldp.org/docs.html#howto>.
  23
  24 if NET
  25
  26 menu "Networking options"
  27
  28 source "net/packet/Kconfig"
  29 source "net/unix/Kconfig"
  30 source "net/xfrm/Kconfig"
  31 source "net/iucv/Kconfig"
  32
  33 config INET
  34         bool "TCP/IP networking"
  35         ---help---
  36           These are the protocols used on the Internet and on most local
  37           Ethernets. It is highly recommended to say Y here (this will enlarge
  38           your kernel by about 400 KB), since some programs (e.g. the X window
  39           system) use TCP/IP even if your machine is not connected to any
  40           other computer. You will get the so-called loopback device which
  41           allows you to ping yourself (great fun, that!).
  42
  43           For an excellent introduction to Linux networking, please read the
  44           Linux Networking HOWTO, available from
  45           <http://www.tldp.org/docs.html#howto>.
  46
  47           If you say Y here and also to "/proc file system support" and
  48           "Sysctl support" below, you can change various aspects of the
  49           behavior of the TCP/IP code by writing to the (virtual) files in
  50           /proc/sys/net/ipv4/*; the options are explained in the file
  51           <file:Documentation/networking/ip-sysctl.txt>.
  52
  53           Short answer: say Y.
  54
  55 if INET
  56 source "net/ipv4/Kconfig"
  57 source "net/ipv6/Kconfig"
  58 source "net/netlabel/Kconfig"
  59
  60 endif # if INET
  61
  62 config NETWORK_SECMARK
  63         bool "Security Marking"
  64         help
  65           This enables security marking of network packets, similar
  66           to nfmark, but designated for security purposes.
  67           If you are unsure how to answer this question, answer N.
  68
  69 menuconfig NETFILTER
  70         bool "Network packet filtering framework (Netfilter)"
  71         ---help---
  72           Netfilter is a framework for filtering and mangling network packets
  73           that pass through your Linux box.
  74
  75           The most common use of packet filtering is to run your Linux box as
  76           a firewall protecting a local network from the Internet. The type of
  77           firewall provided by this kernel support is called a "packet
  78           filter", which means that it can reject individual network packets
  79           based on type, source, destination etc. The other kind of firewall,
  80           a "proxy-based" one, is more secure but more intrusive and more
  81           bothersome to set up; it inspects the network traffic much more
  82           closely, modifies it and has knowledge about the higher level
  83           protocols, which a packet filter lacks. Moreover, proxy-based
  84           firewalls often require changes to the programs running on the local
  85           clients. Proxy-based firewalls don't need support by the kernel, but
  86           they are often combined with a packet filter, which only works if
  87           you say Y here.
  88
  89           You should also say Y here if you intend to use your Linux box as
  90           the gateway to the Internet for a local network of machines without
  91           globally valid IP addresses. This is called "masquerading": if one
  92           of the computers on your local network wants to send something to
  93           the outside, your box can "masquerade" as that computer, i.e. it
  94           forwards the traffic to the intended outside destination, but
  95           modifies the packets to make it look like they came from the
  96           firewall box itself. It works both ways: if the outside host
  97           replies, the Linux box will silently forward the traffic to the
  98           correct local computer. This way, the computers on your local net
  99           are completely invisible to the outside world, even though they can
 100           reach the outside and can receive replies. It is even possible to
 101           run globally visible servers from within a masqueraded local network
 102           using a mechanism called portforwarding. Masquerading is also often
 103           called NAT (Network Address Translation).
 104
 105           Another use of Netfilter is in transparent proxying: if a machine on
 106           the local network tries to connect to an outside host, your Linux
 107           box can transparently forward the traffic to a local server,
 108           typically a caching proxy server.
 109
 110           Yet another use of Netfilter is building a bridging firewall. Using
 111           a bridge with Network packet filtering enabled makes iptables "see"
 112           the bridged traffic. For filtering on the lower network and Ethernet
 113           protocols over the bridge, use ebtables (under bridge netfilter
 114           configuration).
 115
 116           Various modules exist for netfilter which replace the previous
 117           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 118           proxying, and portforwarding mechanisms. Please see
 119           <file:Documentation/Changes> under "iptables" for the location of
 120           these packages.
 121
 122           Make sure to say N to "Fast switching" below if you intend to say Y
 123           here, as Fast switching currently bypasses netfilter.
 124
 125           Chances are that you should say Y here if you compile a kernel which
 126           will run as a router and N for regular hosts. If unsure, say N.
 127
 128 if NETFILTER
 129
 130 config NETFILTER_DEBUG
 131         bool "Network packet filtering debugging"
 132         depends on NETFILTER
 133         help
 134           You can say Y here if you want to get additional messages useful in
 135           debugging the netfilter code.
 136
 137 config NETFILTER_ADVANCED
 138         bool "Advanced netfilter configuration"
 139         depends on NETFILTER
 140         default y
 141         help
 142           If you say Y here you can select between all the netfilter modules.
 143           If you say N the more unusual ones will not be shown and the
 144           basic ones needed by most people will default to 'M'.
 145
 146           If unsure, say Y.
 147
 148 config BRIDGE_NETFILTER
 149         bool "Bridged IP/ARP packets filtering"
 150         depends on BRIDGE && NETFILTER && INET
 151         depends on NETFILTER_ADVANCED
 152         default y
 153         ---help---
 154           Enabling this option will let arptables resp. iptables see bridged
 155           ARP resp. IP traffic. If you want a bridging firewall, you probably
 156           want this option enabled.
 157           Enabling or disabling this option doesn't enable or disable
 158           ebtables.
 159
 160           If unsure, say N.
 161
 162 source "net/netfilter/Kconfig"
 163 source "net/ipv4/netfilter/Kconfig"
 164 source "net/ipv6/netfilter/Kconfig"
 165 source "net/decnet/netfilter/Kconfig"
 166 source "net/bridge/netfilter/Kconfig"
 167
 168 endif
 169
 170 source "net/dccp/Kconfig"
 171 source "net/sctp/Kconfig"
 172 source "net/rds/Kconfig"
 173 source "net/tipc/Kconfig"
 174 source "net/atm/Kconfig"
 175 source "net/802/Kconfig"
 176 source "net/bridge/Kconfig"
 177 source "net/dsa/Kconfig"
 178 source "net/8021q/Kconfig"
 179 source "net/decnet/Kconfig"
 180 source "net/llc/Kconfig"
 181 source "net/ipx/Kconfig"
 182 source "drivers/net/appletalk/Kconfig"
 183 source "net/x25/Kconfig"
 184 source "net/lapb/Kconfig"
 185 source "net/econet/Kconfig"
 186 source "net/wanrouter/Kconfig"
 187 source "net/phonet/Kconfig"
 188 source "net/sched/Kconfig"
 189 source "net/dcb/Kconfig"
 190
 191 menu "Network testing"
 192
 193 config NET_PKTGEN
 194         tristate "Packet Generator (USE WITH CAUTION)"
 195         depends on PROC_FS
 196         ---help---
 197           This module will inject preconfigured packets, at a configurable
 198           rate, out of a given interface.  It is used for network interface
 199           stress testing and performance analysis.  If you don't understand
 200           what was just said, you don't need it: say N.
 201
 202           Documentation on how to use the packet generator can be found
 203           at <file:Documentation/networking/pktgen.txt>.
 204
 205           To compile this code as a module, choose M here: the
 206           module will be called pktgen.
 207
 208 config NET_TCPPROBE
 209         tristate "TCP connection probing"
 210         depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
 211         ---help---
 212         This module allows for capturing the changes to TCP connection
 213         state in response to incoming packets. It is used for debugging
 214         TCP congestion avoidance modules. If you don't understand
 215         what was just said, you don't need it: say N.
 216
 217         Documentation on how to use TCP connection probing can be found
 218         at http://linux-net.osdl.org/index.php/TcpProbe
 219
 220         To compile this code as a module, choose M here: the
 221         module will be called tcp_probe.
 222
 223 config NET_DROP_MONITOR
 224         boolean "Network packet drop alerting service"
 225         depends on INET && EXPERIMENTAL && TRACEPOINTS
 226         ---help---
 227         This feature provides an alerting service to userspace in the
 228         event that packets are discarded in the network stack.  Alerts
 229         are broadcast via netlink socket to any listening user space
 230         process.  If you don't need network drop alerts, or if you are ok
 231         just checking the various proc files and other utilities for
 232         drop statistics, say N here.
 233
 234 endmenu
 235
 236 endmenu
 237
 238 source "net/ax25/Kconfig"
 239 source "net/can/Kconfig"
 240 source "net/irda/Kconfig"
 241 source "net/bluetooth/Kconfig"
 242 source "net/rxrpc/Kconfig"
 243
 244 config FIB_RULES
 245         bool
 246
 247 menuconfig WIRELESS
 248         bool "Wireless"
 249         depends on !S390
 250         default y
 251
 252 if WIRELESS
 253
 254 source "net/wireless/Kconfig"
 255 source "net/mac80211/Kconfig"
 256
 257 endif # WIRELESS
 258
 259 source "net/wimax/Kconfig"
 260
 261 source "net/rfkill/Kconfig"
 262 source "net/9p/Kconfig"
 263
 264 endif   # if NET