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