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 config WANT_COMPAT_NETLINK_MESSAGES
  27         bool
  28         help
  29           This option can be selected by other options that need compat
  30           netlink messages.
  31
  32 config COMPAT_NETLINK_MESSAGES
  33         def_bool y
  34         depends on COMPAT
  35         depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
  36         help
  37           This option makes it possible to send different netlink messages
  38           to tasks depending on whether the task is a compat task or not. To
  39           achieve this, you need to set skb_shinfo(skb)->frag_list to the
  40           compat skb before sending the skb, the netlink code will sort out
  41           which message to actually pass to the task.
  42
  43           Newly written code should NEVER need this option but do
  44           compat-independent messages instead!
  45
  46 menu "Networking options"
  47
  48 source "net/packet/Kconfig"
  49 source "net/unix/Kconfig"
  50 source "net/xfrm/Kconfig"
  51 source "net/iucv/Kconfig"
  52
  53 config INET
  54         bool "TCP/IP networking"
  55         ---help---
  56           These are the protocols used on the Internet and on most local
  57           Ethernets. It is highly recommended to say Y here (this will enlarge
  58           your kernel by about 400 KB), since some programs (e.g. the X window
  59           system) use TCP/IP even if your machine is not connected to any
  60           other computer. You will get the so-called loopback device which
  61           allows you to ping yourself (great fun, that!).
  62
  63           For an excellent introduction to Linux networking, please read the
  64           Linux Networking HOWTO, available from
  65           <http://www.tldp.org/docs.html#howto>.
  66
  67           If you say Y here and also to "/proc file system support" and
  68           "Sysctl support" below, you can change various aspects of the
  69           behavior of the TCP/IP code by writing to the (virtual) files in
  70           /proc/sys/net/ipv4/*; the options are explained in the file
  71           <file:Documentation/networking/ip-sysctl.txt>.
  72
  73           Short answer: say Y.
  74
  75 if INET
  76 source "net/ipv4/Kconfig"
  77 source "net/ipv6/Kconfig"
  78 source "net/netlabel/Kconfig"
  79
  80 endif # if INET
  81
  82 config NETWORK_SECMARK
  83         bool "Security Marking"
  84         help
  85           This enables security marking of network packets, similar
  86           to nfmark, but designated for security purposes.
  87           If you are unsure how to answer this question, answer N.
  88
  89 config NETWORK_PHY_TIMESTAMPING
  90         bool "Timestamping in PHY devices"
  91         depends on EXPERIMENTAL
  92         help
  93           This allows timestamping of network packets by PHYs with
  94           hardware timestamping capabilities. This option adds some
  95           overhead in the transmit and receive paths.
  96
  97           If you are unsure how to answer this question, answer N.
  98
  99 menuconfig NETFILTER
 100         bool "Network packet filtering framework (Netfilter)"
 101         ---help---
 102           Netfilter is a framework for filtering and mangling network packets
 103           that pass through your Linux box.
 104
 105           The most common use of packet filtering is to run your Linux box as
 106           a firewall protecting a local network from the Internet. The type of
 107           firewall provided by this kernel support is called a "packet
 108           filter", which means that it can reject individual network packets
 109           based on type, source, destination etc. The other kind of firewall,
 110           a "proxy-based" one, is more secure but more intrusive and more
 111           bothersome to set up; it inspects the network traffic much more
 112           closely, modifies it and has knowledge about the higher level
 113           protocols, which a packet filter lacks. Moreover, proxy-based
 114           firewalls often require changes to the programs running on the local
 115           clients. Proxy-based firewalls don't need support by the kernel, but
 116           they are often combined with a packet filter, which only works if
 117           you say Y here.
 118
 119           You should also say Y here if you intend to use your Linux box as
 120           the gateway to the Internet for a local network of machines without
 121           globally valid IP addresses. This is called "masquerading": if one
 122           of the computers on your local network wants to send something to
 123           the outside, your box can "masquerade" as that computer, i.e. it
 124           forwards the traffic to the intended outside destination, but
 125           modifies the packets to make it look like they came from the
 126           firewall box itself. It works both ways: if the outside host
 127           replies, the Linux box will silently forward the traffic to the
 128           correct local computer. This way, the computers on your local net
 129           are completely invisible to the outside world, even though they can
 130           reach the outside and can receive replies. It is even possible to
 131           run globally visible servers from within a masqueraded local network
 132           using a mechanism called portforwarding. Masquerading is also often
 133           called NAT (Network Address Translation).
 134
 135           Another use of Netfilter is in transparent proxying: if a machine on
 136           the local network tries to connect to an outside host, your Linux
 137           box can transparently forward the traffic to a local server,
 138           typically a caching proxy server.
 139
 140           Yet another use of Netfilter is building a bridging firewall. Using
 141           a bridge with Network packet filtering enabled makes iptables "see"
 142           the bridged traffic. For filtering on the lower network and Ethernet
 143           protocols over the bridge, use ebtables (under bridge netfilter
 144           configuration).
 145
 146           Various modules exist for netfilter which replace the previous
 147           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 148           proxying, and portforwarding mechanisms. Please see
 149           <file:Documentation/Changes> under "iptables" for the location of
 150           these packages.
 151
 152 if NETFILTER
 153
 154 config NETFILTER_DEBUG
 155         bool "Network packet filtering debugging"
 156         depends on NETFILTER
 157         help
 158           You can say Y here if you want to get additional messages useful in
 159           debugging the netfilter code.
 160
 161 config NETFILTER_ADVANCED
 162         bool "Advanced netfilter configuration"
 163         depends on NETFILTER
 164         default y
 165         help
 166           If you say Y here you can select between all the netfilter modules.
 167           If you say N the more unusual ones will not be shown and the
 168           basic ones needed by most people will default to 'M'.
 169
 170           If unsure, say Y.
 171
 172 config BRIDGE_NETFILTER
 173         bool "Bridged IP/ARP packets filtering"
 174         depends on BRIDGE && NETFILTER && INET
 175         depends on NETFILTER_ADVANCED
 176         default y
 177         ---help---
 178           Enabling this option will let arptables resp. iptables see bridged
 179           ARP resp. IP traffic. If you want a bridging firewall, you probably
 180           want this option enabled.
 181           Enabling or disabling this option doesn't enable or disable
 182           ebtables.
 183
 184           If unsure, say N.
 185
 186 source "net/netfilter/Kconfig"
 187 source "net/ipv4/netfilter/Kconfig"
 188 source "net/ipv6/netfilter/Kconfig"
 189 source "net/decnet/netfilter/Kconfig"
 190 source "net/bridge/netfilter/Kconfig"
 191
 192 endif
 193
 194 source "net/dccp/Kconfig"
 195 source "net/sctp/Kconfig"
 196 source "net/rds/Kconfig"
 197 source "net/tipc/Kconfig"
 198 source "net/atm/Kconfig"
 199 source "net/l2tp/Kconfig"
 200 source "net/802/Kconfig"
 201 source "net/bridge/Kconfig"
 202 source "net/dsa/Kconfig"
 203 source "net/8021q/Kconfig"
 204 source "net/decnet/Kconfig"
 205 source "net/llc/Kconfig"
 206 source "net/ipx/Kconfig"
 207 source "drivers/net/appletalk/Kconfig"
 208 source "net/x25/Kconfig"
 209 source "net/lapb/Kconfig"
 210 source "net/econet/Kconfig"
 211 source "net/wanrouter/Kconfig"
 212 source "net/phonet/Kconfig"
 213 source "net/ieee802154/Kconfig"
 214 source "net/sched/Kconfig"
 215 source "net/dcb/Kconfig"
 216 source "net/dns_resolver/Kconfig"
 217
 218 config RPS
 219         boolean
 220         depends on SMP && SYSFS
 221         default y
 222
 223 menu "Network testing"
 224
 225 config NET_PKTGEN
 226         tristate "Packet Generator (USE WITH CAUTION)"
 227         depends on PROC_FS
 228         ---help---
 229           This module will inject preconfigured packets, at a configurable
 230           rate, out of a given interface.  It is used for network interface
 231           stress testing and performance analysis.  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 <file:Documentation/networking/pktgen.txt>.
 236
 237           To compile this code as a module, choose M here: the
 238           module will be called pktgen.
 239
 240 config NET_TCPPROBE
 241         tristate "TCP connection probing"
 242         depends on INET && EXPERIMENTAL && PROC_FS && KPROBES
 243         ---help---
 244         This module allows for capturing the changes to TCP connection
 245         state in response to incoming packets. It is used for debugging
 246         TCP congestion avoidance modules. If you don't understand
 247         what was just said, you don't need it: say N.
 248
 249         Documentation on how to use TCP connection probing can be found
 250         at http://linux-net.osdl.org/index.php/TcpProbe
 251
 252         To compile this code as a module, choose M here: the
 253         module will be called tcp_probe.
 254
 255 config NET_DROP_MONITOR
 256         boolean "Network packet drop alerting service"
 257         depends on INET && EXPERIMENTAL && TRACEPOINTS
 258         ---help---
 259         This feature provides an alerting service to userspace in the
 260         event that packets are discarded in the network stack.  Alerts
 261         are broadcast via netlink socket to any listening user space
 262         process.  If you don't need network drop alerts, or if you are ok
 263         just checking the various proc files and other utilities for
 264         drop statistics, say N here.
 265
 266 endmenu
 267
 268 endmenu
 269
 270 source "net/ax25/Kconfig"
 271 source "net/can/Kconfig"
 272 source "net/irda/Kconfig"
 273 source "net/bluetooth/Kconfig"
 274 source "net/rxrpc/Kconfig"
 275
 276 config FIB_RULES
 277         bool
 278
 279 menuconfig WIRELESS
 280         bool "Wireless"
 281         depends on !S390
 282         default y
 283
 284 if WIRELESS
 285
 286 source "net/wireless/Kconfig"
 287 source "net/mac80211/Kconfig"
 288
 289 endif # WIRELESS
 290
 291 source "net/wimax/Kconfig"
 292
 293 source "net/rfkill/Kconfig"
 294 source "net/9p/Kconfig"
 295 source "net/caif/Kconfig"
 296
 297
 298 endif   # if NET