linux/net/Kconfig
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   1#
   2# Network configuration
   3#
   4
   5menuconfig NET
   6        bool "Networking support"
   7        select NLATTR
   8        select GENERIC_NET_UTILS
   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
  25if NET
  26
  27config WANT_COMPAT_NETLINK_MESSAGES
  28        bool
  29        help
  30          This option can be selected by other options that need compat
  31          netlink messages.
  32
  33config COMPAT_NETLINK_MESSAGES
  34        def_bool y
  35        depends on COMPAT
  36        depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
  37        help
  38          This option makes it possible to send different netlink messages
  39          to tasks depending on whether the task is a compat task or not. To
  40          achieve this, you need to set skb_shinfo(skb)->frag_list to the
  41          compat skb before sending the skb, the netlink code will sort out
  42          which message to actually pass to the task.
  43
  44          Newly written code should NEVER need this option but do
  45          compat-independent messages instead!
  46
  47menu "Networking options"
  48
  49source "net/packet/Kconfig"
  50source "net/unix/Kconfig"
  51source "net/xfrm/Kconfig"
  52source "net/iucv/Kconfig"
  53
  54config INET
  55        bool "TCP/IP networking"
  56        select CRYPTO
  57        select CRYPTO_AES
  58        ---help---
  59          These are the protocols used on the Internet and on most local
  60          Ethernets. It is highly recommended to say Y here (this will enlarge
  61          your kernel by about 400 KB), since some programs (e.g. the X window
  62          system) use TCP/IP even if your machine is not connected to any
  63          other computer. You will get the so-called loopback device which
  64          allows you to ping yourself (great fun, that!).
  65
  66          For an excellent introduction to Linux networking, please read the
  67          Linux Networking HOWTO, available from
  68          <http://www.tldp.org/docs.html#howto>.
  69
  70          If you say Y here and also to "/proc file system support" and
  71          "Sysctl support" below, you can change various aspects of the
  72          behavior of the TCP/IP code by writing to the (virtual) files in
  73          /proc/sys/net/ipv4/*; the options are explained in the file
  74          <file:Documentation/networking/ip-sysctl.txt>.
  75
  76          Short answer: say Y.
  77
  78if INET
  79source "net/ipv4/Kconfig"
  80source "net/ipv6/Kconfig"
  81source "net/netlabel/Kconfig"
  82
  83endif # if INET
  84
  85config NETWORK_SECMARK
  86        bool "Security Marking"
  87        help
  88          This enables security marking of network packets, similar
  89          to nfmark, but designated for security purposes.
  90          If you are unsure how to answer this question, answer N.
  91
  92config NETWORK_PHY_TIMESTAMPING
  93        bool "Timestamping in PHY devices"
  94        help
  95          This allows timestamping of network packets by PHYs with
  96          hardware timestamping capabilities. This option adds some
  97          overhead in the transmit and receive paths.
  98
  99          If you are unsure how to answer this question, answer N.
 100
 101menuconfig NETFILTER
 102        bool "Network packet filtering framework (Netfilter)"
 103        ---help---
 104          Netfilter is a framework for filtering and mangling network packets
 105          that pass through your Linux box.
 106
 107          The most common use of packet filtering is to run your Linux box as
 108          a firewall protecting a local network from the Internet. The type of
 109          firewall provided by this kernel support is called a "packet
 110          filter", which means that it can reject individual network packets
 111          based on type, source, destination etc. The other kind of firewall,
 112          a "proxy-based" one, is more secure but more intrusive and more
 113          bothersome to set up; it inspects the network traffic much more
 114          closely, modifies it and has knowledge about the higher level
 115          protocols, which a packet filter lacks. Moreover, proxy-based
 116          firewalls often require changes to the programs running on the local
 117          clients. Proxy-based firewalls don't need support by the kernel, but
 118          they are often combined with a packet filter, which only works if
 119          you say Y here.
 120
 121          You should also say Y here if you intend to use your Linux box as
 122          the gateway to the Internet for a local network of machines without
 123          globally valid IP addresses. This is called "masquerading": if one
 124          of the computers on your local network wants to send something to
 125          the outside, your box can "masquerade" as that computer, i.e. it
 126          forwards the traffic to the intended outside destination, but
 127          modifies the packets to make it look like they came from the
 128          firewall box itself. It works both ways: if the outside host
 129          replies, the Linux box will silently forward the traffic to the
 130          correct local computer. This way, the computers on your local net
 131          are completely invisible to the outside world, even though they can
 132          reach the outside and can receive replies. It is even possible to
 133          run globally visible servers from within a masqueraded local network
 134          using a mechanism called portforwarding. Masquerading is also often
 135          called NAT (Network Address Translation).
 136
 137          Another use of Netfilter is in transparent proxying: if a machine on
 138          the local network tries to connect to an outside host, your Linux
 139          box can transparently forward the traffic to a local server,
 140          typically a caching proxy server.
 141
 142          Yet another use of Netfilter is building a bridging firewall. Using
 143          a bridge with Network packet filtering enabled makes iptables "see"
 144          the bridged traffic. For filtering on the lower network and Ethernet
 145          protocols over the bridge, use ebtables (under bridge netfilter
 146          configuration).
 147
 148          Various modules exist for netfilter which replace the previous
 149          masquerading (ipmasqadm), packet filtering (ipchains), transparent
 150          proxying, and portforwarding mechanisms. Please see
 151          <file:Documentation/Changes> under "iptables" for the location of
 152          these packages.
 153
 154if NETFILTER
 155
 156config NETFILTER_DEBUG
 157        bool "Network packet filtering debugging"
 158        depends on NETFILTER
 159        help
 160          You can say Y here if you want to get additional messages useful in
 161          debugging the netfilter code.
 162
 163config NETFILTER_ADVANCED
 164        bool "Advanced netfilter configuration"
 165        depends on NETFILTER
 166        default y
 167        help
 168          If you say Y here you can select between all the netfilter modules.
 169          If you say N the more unusual ones will not be shown and the
 170          basic ones needed by most people will default to 'M'.
 171
 172          If unsure, say Y.
 173
 174config BRIDGE_NETFILTER
 175        bool "Bridged IP/ARP packets filtering"
 176        depends on BRIDGE && NETFILTER && INET
 177        depends on NETFILTER_ADVANCED
 178        default y
 179        ---help---
 180          Enabling this option will let arptables resp. iptables see bridged
 181          ARP resp. IP traffic. If you want a bridging firewall, you probably
 182          want this option enabled.
 183          Enabling or disabling this option doesn't enable or disable
 184          ebtables.
 185
 186          If unsure, say N.
 187
 188source "net/netfilter/Kconfig"
 189source "net/ipv4/netfilter/Kconfig"
 190source "net/ipv6/netfilter/Kconfig"
 191source "net/decnet/netfilter/Kconfig"
 192source "net/bridge/netfilter/Kconfig"
 193
 194endif
 195
 196source "net/dccp/Kconfig"
 197source "net/sctp/Kconfig"
 198source "net/rds/Kconfig"
 199source "net/tipc/Kconfig"
 200source "net/atm/Kconfig"
 201source "net/l2tp/Kconfig"
 202source "net/802/Kconfig"
 203source "net/bridge/Kconfig"
 204source "net/dsa/Kconfig"
 205source "net/8021q/Kconfig"
 206source "net/decnet/Kconfig"
 207source "net/llc/Kconfig"
 208source "net/ipx/Kconfig"
 209source "drivers/net/appletalk/Kconfig"
 210source "net/x25/Kconfig"
 211source "net/lapb/Kconfig"
 212source "net/phonet/Kconfig"
 213source "net/ieee802154/Kconfig"
 214source "net/mac802154/Kconfig"
 215source "net/sched/Kconfig"
 216source "net/dcb/Kconfig"
 217source "net/dns_resolver/Kconfig"
 218source "net/batman-adv/Kconfig"
 219source "net/openvswitch/Kconfig"
 220source "net/vmw_vsock/Kconfig"
 221source "net/netlink/Kconfig"
 222source "net/mpls/Kconfig"
 223
 224config RPS
 225        boolean
 226        depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
 227        default y
 228
 229config RFS_ACCEL
 230        boolean
 231        depends on RPS && GENERIC_HARDIRQS
 232        select CPU_RMAP
 233        default y
 234
 235config XPS
 236        boolean
 237        depends on SMP && USE_GENERIC_SMP_HELPERS
 238        default y
 239
 240config NETPRIO_CGROUP
 241        tristate "Network priority cgroup"
 242        depends on CGROUPS
 243        ---help---
 244          Cgroup subsystem for use in assigning processes to network priorities on
 245          a per-interface basis
 246
 247config NET_RX_BUSY_POLL
 248        boolean
 249        default y
 250
 251config BQL
 252        boolean
 253        depends on SYSFS
 254        select DQL
 255        default y
 256
 257config BPF_JIT
 258        bool "enable BPF Just In Time compiler"
 259        depends on HAVE_BPF_JIT
 260        depends on MODULES
 261        ---help---
 262          Berkeley Packet Filter filtering capabilities are normally handled
 263          by an interpreter. This option allows kernel to generate a native
 264          code when filter is loaded in memory. This should speedup
 265          packet sniffing (libpcap/tcpdump). Note : Admin should enable
 266          this feature changing /proc/sys/net/core/bpf_jit_enable
 267
 268config NET_FLOW_LIMIT
 269        boolean
 270        depends on RPS
 271        default y
 272        ---help---
 273          The network stack has to drop packets when a receive processing CPU's
 274          backlog reaches netdev_max_backlog. If a few out of many active flows
 275          generate the vast majority of load, drop their traffic earlier to
 276          maintain capacity for the other flows. This feature provides servers
 277          with many clients some protection against DoS by a single (spoofed)
 278          flow that greatly exceeds average workload.
 279
 280menu "Network testing"
 281
 282config NET_PKTGEN
 283        tristate "Packet Generator (USE WITH CAUTION)"
 284        depends on PROC_FS
 285        ---help---
 286          This module will inject preconfigured packets, at a configurable
 287          rate, out of a given interface.  It is used for network interface
 288          stress testing and performance analysis.  If you don't understand
 289          what was just said, you don't need it: say N.
 290
 291          Documentation on how to use the packet generator can be found
 292          at <file:Documentation/networking/pktgen.txt>.
 293
 294          To compile this code as a module, choose M here: the
 295          module will be called pktgen.
 296
 297config NET_TCPPROBE
 298        tristate "TCP connection probing"
 299        depends on INET && PROC_FS && KPROBES
 300        ---help---
 301        This module allows for capturing the changes to TCP connection
 302        state in response to incoming packets. It is used for debugging
 303        TCP congestion avoidance modules. If you don't understand
 304        what was just said, you don't need it: say N.
 305
 306        Documentation on how to use TCP connection probing can be found
 307        at:
 308        
 309          http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 310
 311        To compile this code as a module, choose M here: the
 312        module will be called tcp_probe.
 313
 314config NET_DROP_MONITOR
 315        tristate "Network packet drop alerting service"
 316        depends on INET && TRACEPOINTS
 317        ---help---
 318        This feature provides an alerting service to userspace in the
 319        event that packets are discarded in the network stack.  Alerts
 320        are broadcast via netlink socket to any listening user space
 321        process.  If you don't need network drop alerts, or if you are ok
 322        just checking the various proc files and other utilities for
 323        drop statistics, say N here.
 324
 325endmenu
 326
 327endmenu
 328
 329source "net/ax25/Kconfig"
 330source "net/can/Kconfig"
 331source "net/irda/Kconfig"
 332source "net/bluetooth/Kconfig"
 333source "net/rxrpc/Kconfig"
 334
 335config FIB_RULES
 336        bool
 337
 338menuconfig WIRELESS
 339        bool "Wireless"
 340        depends on !S390
 341        default y
 342
 343if WIRELESS
 344
 345source "net/wireless/Kconfig"
 346source "net/mac80211/Kconfig"
 347
 348endif # WIRELESS
 349
 350source "net/wimax/Kconfig"
 351
 352source "net/rfkill/Kconfig"
 353source "net/9p/Kconfig"
 354source "net/caif/Kconfig"
 355source "net/ceph/Kconfig"
 356source "net/nfc/Kconfig"
 357
 358
 359endif   # if NET
 360
 361# Used by archs to tell that they support BPF_JIT
 362config HAVE_BPF_JIT
 363        bool
 364
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