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 NETLINK_MMAP
  27         bool "Netlink: mmaped IO"
  28         help
  29           This option enables support for memory mapped netlink IO. This
  30           reduces overhead by avoiding copying data between kernel- and
  31           userspace.
  32
  33           If unsure, say N.
  34
  35 config WANT_COMPAT_NETLINK_MESSAGES
  36         bool
  37         help
  38           This option can be selected by other options that need compat
  39           netlink messages.
  40
  41 config COMPAT_NETLINK_MESSAGES
  42         def_bool y
  43         depends on COMPAT
  44         depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
  45         help
  46           This option makes it possible to send different netlink messages
  47           to tasks depending on whether the task is a compat task or not. To
  48           achieve this, you need to set skb_shinfo(skb)->frag_list to the
  49           compat skb before sending the skb, the netlink code will sort out
  50           which message to actually pass to the task.
  51
  52           Newly written code should NEVER need this option but do
  53           compat-independent messages instead!
  54
  55 menu "Networking options"
  56
  57 source "net/packet/Kconfig"
  58 source "net/unix/Kconfig"
  59 source "net/xfrm/Kconfig"
  60 source "net/iucv/Kconfig"
  61
  62 config INET
  63         bool "TCP/IP networking"
  64         select CRYPTO
  65         select CRYPTO_AES
  66         ---help---
  67           These are the protocols used on the Internet and on most local
  68           Ethernets. It is highly recommended to say Y here (this will enlarge
  69           your kernel by about 400 KB), since some programs (e.g. the X window
  70           system) use TCP/IP even if your machine is not connected to any
  71           other computer. You will get the so-called loopback device which
  72           allows you to ping yourself (great fun, that!).
  73
  74           For an excellent introduction to Linux networking, please read the
  75           Linux Networking HOWTO, available from
  76           <http://www.tldp.org/docs.html#howto>.
  77
  78           If you say Y here and also to "/proc file system support" and
  79           "Sysctl support" below, you can change various aspects of the
  80           behavior of the TCP/IP code by writing to the (virtual) files in
  81           /proc/sys/net/ipv4/*; the options are explained in the file
  82           <file:Documentation/networking/ip-sysctl.txt>.
  83
  84           Short answer: say Y.
  85
  86 if INET
  87 source "net/ipv4/Kconfig"
  88 source "net/ipv6/Kconfig"
  89 source "net/netlabel/Kconfig"
  90
  91 endif # if INET
  92
  93 config NETWORK_SECMARK
  94         bool "Security Marking"
  95         help
  96           This enables security marking of network packets, similar
  97           to nfmark, but designated for security purposes.
  98           If you are unsure how to answer this question, answer N.
  99
 100 config NETWORK_PHY_TIMESTAMPING
 101         bool "Timestamping in PHY devices"
 102         help
 103           This allows timestamping of network packets by PHYs with
 104           hardware timestamping capabilities. This option adds some
 105           overhead in the transmit and receive paths.
 106
 107           If you are unsure how to answer this question, answer N.
 108
 109 menuconfig NETFILTER
 110         bool "Network packet filtering framework (Netfilter)"
 111         ---help---
 112           Netfilter is a framework for filtering and mangling network packets
 113           that pass through your Linux box.
 114
 115           The most common use of packet filtering is to run your Linux box as
 116           a firewall protecting a local network from the Internet. The type of
 117           firewall provided by this kernel support is called a "packet
 118           filter", which means that it can reject individual network packets
 119           based on type, source, destination etc. The other kind of firewall,
 120           a "proxy-based" one, is more secure but more intrusive and more
 121           bothersome to set up; it inspects the network traffic much more
 122           closely, modifies it and has knowledge about the higher level
 123           protocols, which a packet filter lacks. Moreover, proxy-based
 124           firewalls often require changes to the programs running on the local
 125           clients. Proxy-based firewalls don't need support by the kernel, but
 126           they are often combined with a packet filter, which only works if
 127           you say Y here.
 128
 129           You should also say Y here if you intend to use your Linux box as
 130           the gateway to the Internet for a local network of machines without
 131           globally valid IP addresses. This is called "masquerading": if one
 132           of the computers on your local network wants to send something to
 133           the outside, your box can "masquerade" as that computer, i.e. it
 134           forwards the traffic to the intended outside destination, but
 135           modifies the packets to make it look like they came from the
 136           firewall box itself. It works both ways: if the outside host
 137           replies, the Linux box will silently forward the traffic to the
 138           correct local computer. This way, the computers on your local net
 139           are completely invisible to the outside world, even though they can
 140           reach the outside and can receive replies. It is even possible to
 141           run globally visible servers from within a masqueraded local network
 142           using a mechanism called portforwarding. Masquerading is also often
 143           called NAT (Network Address Translation).
 144
 145           Another use of Netfilter is in transparent proxying: if a machine on
 146           the local network tries to connect to an outside host, your Linux
 147           box can transparently forward the traffic to a local server,
 148           typically a caching proxy server.
 149
 150           Yet another use of Netfilter is building a bridging firewall. Using
 151           a bridge with Network packet filtering enabled makes iptables "see"
 152           the bridged traffic. For filtering on the lower network and Ethernet
 153           protocols over the bridge, use ebtables (under bridge netfilter
 154           configuration).
 155
 156           Various modules exist for netfilter which replace the previous
 157           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 158           proxying, and portforwarding mechanisms. Please see
 159           <file:Documentation/Changes> under "iptables" for the location of
 160           these packages.
 161
 162 if NETFILTER
 163
 164 config NETFILTER_DEBUG
 165         bool "Network packet filtering debugging"
 166         depends on NETFILTER
 167         help
 168           You can say Y here if you want to get additional messages useful in
 169           debugging the netfilter code.
 170
 171 config NETFILTER_ADVANCED
 172         bool "Advanced netfilter configuration"
 173         depends on NETFILTER
 174         default y
 175         help
 176           If you say Y here you can select between all the netfilter modules.
 177           If you say N the more unusual ones will not be shown and the
 178           basic ones needed by most people will default to 'M'.
 179
 180           If unsure, say Y.
 181
 182 config BRIDGE_NETFILTER
 183         bool "Bridged IP/ARP packets filtering"
 184         depends on BRIDGE && NETFILTER && INET
 185         depends on NETFILTER_ADVANCED
 186         default y
 187         ---help---
 188           Enabling this option will let arptables resp. iptables see bridged
 189           ARP resp. IP traffic. If you want a bridging firewall, you probably
 190           want this option enabled.
 191           Enabling or disabling this option doesn't enable or disable
 192           ebtables.
 193
 194           If unsure, say N.
 195
 196 source "net/netfilter/Kconfig"
 197 source "net/ipv4/netfilter/Kconfig"
 198 source "net/ipv6/netfilter/Kconfig"
 199 source "net/decnet/netfilter/Kconfig"
 200 source "net/bridge/netfilter/Kconfig"
 201
 202 endif
 203
 204 source "net/dccp/Kconfig"
 205 source "net/sctp/Kconfig"
 206 source "net/rds/Kconfig"
 207 source "net/tipc/Kconfig"
 208 source "net/atm/Kconfig"
 209 source "net/l2tp/Kconfig"
 210 source "net/802/Kconfig"
 211 source "net/bridge/Kconfig"
 212 source "net/dsa/Kconfig"
 213 source "net/8021q/Kconfig"
 214 source "net/decnet/Kconfig"
 215 source "net/llc/Kconfig"
 216 source "net/ipx/Kconfig"
 217 source "drivers/net/appletalk/Kconfig"
 218 source "net/x25/Kconfig"
 219 source "net/lapb/Kconfig"
 220 source "net/phonet/Kconfig"
 221 source "net/ieee802154/Kconfig"
 222 source "net/mac802154/Kconfig"
 223 source "net/sched/Kconfig"
 224 source "net/dcb/Kconfig"
 225 source "net/dns_resolver/Kconfig"
 226 source "net/batman-adv/Kconfig"
 227 source "net/openvswitch/Kconfig"
 228 source "net/vmw_vsock/Kconfig"
 229 source "net/netlink/Kconfig"
 230
 231 config RPS
 232         boolean
 233         depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
 234         default y
 235
 236 config RFS_ACCEL
 237         boolean
 238         depends on RPS && GENERIC_HARDIRQS
 239         select CPU_RMAP
 240         default y
 241
 242 config XPS
 243         boolean
 244         depends on SMP && USE_GENERIC_SMP_HELPERS
 245         default y
 246
 247 config NETPRIO_CGROUP
 248         tristate "Network priority cgroup"
 249         depends on CGROUPS
 250         ---help---
 251           Cgroup subsystem for use in assigning processes to network priorities on
 252           a per-interface basis
 253
 254 config BQL
 255         boolean
 256         depends on SYSFS
 257         select DQL
 258         default y
 259
 260 config BPF_JIT
 261         bool "enable BPF Just In Time compiler"
 262         depends on HAVE_BPF_JIT
 263         depends on MODULES
 264         ---help---
 265           Berkeley Packet Filter filtering capabilities are normally handled
 266           by an interpreter. This option allows kernel to generate a native
 267           code when filter is loaded in memory. This should speedup
 268           packet sniffing (libpcap/tcpdump). Note : Admin should enable
 269           this feature changing /proc/sys/net/core/bpf_jit_enable
 270
 271 menu "Network testing"
 272
 273 config NET_PKTGEN
 274         tristate "Packet Generator (USE WITH CAUTION)"
 275         depends on PROC_FS
 276         ---help---
 277           This module will inject preconfigured packets, at a configurable
 278           rate, out of a given interface.  It is used for network interface
 279           stress testing and performance analysis.  If you don't understand
 280           what was just said, you don't need it: say N.
 281
 282           Documentation on how to use the packet generator can be found
 283           at <file:Documentation/networking/pktgen.txt>.
 284
 285           To compile this code as a module, choose M here: the
 286           module will be called pktgen.
 287
 288 config NET_TCPPROBE
 289         tristate "TCP connection probing"
 290         depends on INET && PROC_FS && KPROBES
 291         ---help---
 292         This module allows for capturing the changes to TCP connection
 293         state in response to incoming packets. It is used for debugging
 294         TCP congestion avoidance modules. If you don't understand
 295         what was just said, you don't need it: say N.
 296
 297         Documentation on how to use TCP connection probing can be found
 298         at:
 299
 300           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 301
 302         To compile this code as a module, choose M here: the
 303         module will be called tcp_probe.
 304
 305 config NET_DROP_MONITOR
 306         tristate "Network packet drop alerting service"
 307         depends on INET && TRACEPOINTS
 308         ---help---
 309         This feature provides an alerting service to userspace in the
 310         event that packets are discarded in the network stack.  Alerts
 311         are broadcast via netlink socket to any listening user space
 312         process.  If you don't need network drop alerts, or if you are ok
 313         just checking the various proc files and other utilities for
 314         drop statistics, say N here.
 315
 316 endmenu
 317
 318 endmenu
 319
 320 source "net/ax25/Kconfig"
 321 source "net/can/Kconfig"
 322 source "net/irda/Kconfig"
 323 source "net/bluetooth/Kconfig"
 324 source "net/rxrpc/Kconfig"
 325
 326 config FIB_RULES
 327         bool
 328
 329 menuconfig WIRELESS
 330         bool "Wireless"
 331         depends on !S390
 332         default y
 333
 334 if WIRELESS
 335
 336 source "net/wireless/Kconfig"
 337 source "net/mac80211/Kconfig"
 338
 339 endif # WIRELESS
 340
 341 source "net/wimax/Kconfig"
 342
 343 source "net/rfkill/Kconfig"
 344 source "net/9p/Kconfig"
 345 source "net/caif/Kconfig"
 346 source "net/ceph/Kconfig"
 347 source "net/nfc/Kconfig"
 348
 349
 350 endif   # if NET
 351
 352 # Used by archs to tell that they support BPF_JIT
 353 config HAVE_BPF_JIT
 354         bool