net/Kconfig

   1 #
   2 # Network configuration
   3 #
   4
   5 menuconfig NET
   6         bool "Networking support"
   7         select NLATTR
   8         select GENERIC_NET_UTILS
   9         select BPF
  10         ---help---
  11           Unless you really know what you are doing, you should say Y here.
  12           The reason is that some programs need kernel networking support even
  13           when running on a stand-alone machine that isn't connected to any
  14           other computer.
  15
  16           If you are upgrading from an older kernel, you
  17           should consider updating your networking tools too because changes
  18           in the kernel and the tools often go hand in hand. The tools are
  19           contained in the package net-tools, the location and version number
  20           of which are given in <file:Documentation/Changes>.
  21
  22           For a general introduction to Linux networking, it is highly
  23           recommended to read the NET-HOWTO, available from
  24           <http://www.tldp.org/docs.html#howto>.
  25
  26 if NET
  27
  28 config WANT_COMPAT_NETLINK_MESSAGES
  29         bool
  30         help
  31           This option can be selected by other options that need compat
  32           netlink messages.
  33
  34 config COMPAT_NETLINK_MESSAGES
  35         def_bool y
  36         depends on COMPAT
  37         depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES
  38         help
  39           This option makes it possible to send different netlink messages
  40           to tasks depending on whether the task is a compat task or not. To
  41           achieve this, you need to set skb_shinfo(skb)->frag_list to the
  42           compat skb before sending the skb, the netlink code will sort out
  43           which message to actually pass to the task.
  44
  45           Newly written code should NEVER need this option but do
  46           compat-independent messages instead!
  47
  48 config NET_INGRESS
  49         bool
  50
  51 config NET_EGRESS
  52         bool
  53
  54 menu "Networking options"
  55
  56 source "net/packet/Kconfig"
  57 source "net/unix/Kconfig"
  58 source "net/tls/Kconfig"
  59 source "net/xfrm/Kconfig"
  60 source "net/iucv/Kconfig"
  61 source "net/smc/Kconfig"
  62
  63 config INET
  64         bool "TCP/IP networking"
  65         select CRYPTO
  66         select CRYPTO_AES
  67         ---help---
  68           These are the protocols used on the Internet and on most local
  69           Ethernets. It is highly recommended to say Y here (this will enlarge
  70           your kernel by about 400 KB), since some programs (e.g. the X window
  71           system) use TCP/IP even if your machine is not connected to any
  72           other computer. You will get the so-called loopback device which
  73           allows you to ping yourself (great fun, that!).
  74
  75           For an excellent introduction to Linux networking, please read the
  76           Linux Networking HOWTO, available from
  77           <http://www.tldp.org/docs.html#howto>.
  78
  79           If you say Y here and also to "/proc file system support" and
  80           "Sysctl support" below, you can change various aspects of the
  81           behavior of the TCP/IP code by writing to the (virtual) files in
  82           /proc/sys/net/ipv4/*; the options are explained in the file
  83           <file:Documentation/networking/ip-sysctl.txt>.
  84
  85           Short answer: say Y.
  86
  87 if INET
  88 source "net/ipv4/Kconfig"
  89 source "net/ipv6/Kconfig"
  90 source "net/netlabel/Kconfig"
  91
  92 endif # if INET
  93
  94 config NETWORK_SECMARK
  95         bool "Security Marking"
  96         help
  97           This enables security marking of network packets, similar
  98           to nfmark, but designated for security purposes.
  99           If you are unsure how to answer this question, answer N.
 100
 101 config NET_PTP_CLASSIFY
 102         def_bool n
 103
 104 config NETWORK_PHY_TIMESTAMPING
 105         bool "Timestamping in PHY devices"
 106         select NET_PTP_CLASSIFY
 107         help
 108           This allows timestamping of network packets by PHYs with
 109           hardware timestamping capabilities. This option adds some
 110           overhead in the transmit and receive paths.
 111
 112           If you are unsure how to answer this question, answer N.
 113
 114 menuconfig NETFILTER
 115         bool "Network packet filtering framework (Netfilter)"
 116         ---help---
 117           Netfilter is a framework for filtering and mangling network packets
 118           that pass through your Linux box.
 119
 120           The most common use of packet filtering is to run your Linux box as
 121           a firewall protecting a local network from the Internet. The type of
 122           firewall provided by this kernel support is called a "packet
 123           filter", which means that it can reject individual network packets
 124           based on type, source, destination etc. The other kind of firewall,
 125           a "proxy-based" one, is more secure but more intrusive and more
 126           bothersome to set up; it inspects the network traffic much more
 127           closely, modifies it and has knowledge about the higher level
 128           protocols, which a packet filter lacks. Moreover, proxy-based
 129           firewalls often require changes to the programs running on the local
 130           clients. Proxy-based firewalls don't need support by the kernel, but
 131           they are often combined with a packet filter, which only works if
 132           you say Y here.
 133
 134           You should also say Y here if you intend to use your Linux box as
 135           the gateway to the Internet for a local network of machines without
 136           globally valid IP addresses. This is called "masquerading": if one
 137           of the computers on your local network wants to send something to
 138           the outside, your box can "masquerade" as that computer, i.e. it
 139           forwards the traffic to the intended outside destination, but
 140           modifies the packets to make it look like they came from the
 141           firewall box itself. It works both ways: if the outside host
 142           replies, the Linux box will silently forward the traffic to the
 143           correct local computer. This way, the computers on your local net
 144           are completely invisible to the outside world, even though they can
 145           reach the outside and can receive replies. It is even possible to
 146           run globally visible servers from within a masqueraded local network
 147           using a mechanism called portforwarding. Masquerading is also often
 148           called NAT (Network Address Translation).
 149
 150           Another use of Netfilter is in transparent proxying: if a machine on
 151           the local network tries to connect to an outside host, your Linux
 152           box can transparently forward the traffic to a local server,
 153           typically a caching proxy server.
 154
 155           Yet another use of Netfilter is building a bridging firewall. Using
 156           a bridge with Network packet filtering enabled makes iptables "see"
 157           the bridged traffic. For filtering on the lower network and Ethernet
 158           protocols over the bridge, use ebtables (under bridge netfilter
 159           configuration).
 160
 161           Various modules exist for netfilter which replace the previous
 162           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 163           proxying, and portforwarding mechanisms. Please see
 164           <file:Documentation/Changes> under "iptables" for the location of
 165           these packages.
 166
 167 if NETFILTER
 168
 169 config NETFILTER_ADVANCED
 170         bool "Advanced netfilter configuration"
 171         depends on NETFILTER
 172         default y
 173         help
 174           If you say Y here you can select between all the netfilter modules.
 175           If you say N the more unusual ones will not be shown and the
 176           basic ones needed by most people will default to 'M'.
 177
 178           If unsure, say Y.
 179
 180 config BRIDGE_NETFILTER
 181         tristate "Bridged IP/ARP packets filtering"
 182         depends on BRIDGE
 183         depends on NETFILTER && INET
 184         depends on NETFILTER_ADVANCED
 185         default m
 186         ---help---
 187           Enabling this option will let arptables resp. iptables see bridged
 188           ARP resp. IP traffic. If you want a bridging firewall, you probably
 189           want this option enabled.
 190           Enabling or disabling this option doesn't enable or disable
 191           ebtables.
 192
 193           If unsure, say N.
 194
 195 source "net/netfilter/Kconfig"
 196 source "net/ipv4/netfilter/Kconfig"
 197 source "net/ipv6/netfilter/Kconfig"
 198 source "net/decnet/netfilter/Kconfig"
 199 source "net/bridge/netfilter/Kconfig"
 200
 201 endif
 202
 203 source "net/dccp/Kconfig"
 204 source "net/sctp/Kconfig"
 205 source "net/rds/Kconfig"
 206 source "net/tipc/Kconfig"
 207 source "net/atm/Kconfig"
 208 source "net/l2tp/Kconfig"
 209 source "net/802/Kconfig"
 210 source "net/bridge/Kconfig"
 211 source "net/dsa/Kconfig"
 212 source "net/8021q/Kconfig"
 213 source "net/decnet/Kconfig"
 214 source "net/llc/Kconfig"
 215 source "net/ipx/Kconfig"
 216 source "drivers/net/appletalk/Kconfig"
 217 source "net/x25/Kconfig"
 218 source "net/lapb/Kconfig"
 219 source "net/phonet/Kconfig"
 220 source "net/6lowpan/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 source "net/mpls/Kconfig"
 231 source "net/nsh/Kconfig"
 232 source "net/hsr/Kconfig"
 233 source "net/switchdev/Kconfig"
 234 source "net/l3mdev/Kconfig"
 235 source "net/qrtr/Kconfig"
 236 source "net/ncsi/Kconfig"
 237
 238 config RPS
 239         bool
 240         depends on SMP && SYSFS
 241         default y
 242
 243 config RFS_ACCEL
 244         bool
 245         depends on RPS
 246         select CPU_RMAP
 247         default y
 248
 249 config XPS
 250         bool
 251         depends on SMP
 252         default y
 253
 254 config HWBM
 255        bool
 256
 257 config CGROUP_NET_PRIO
 258         bool "Network priority cgroup"
 259         depends on CGROUPS
 260         select SOCK_CGROUP_DATA
 261         ---help---
 262           Cgroup subsystem for use in assigning processes to network priorities on
 263           a per-interface basis.
 264
 265 config CGROUP_NET_CLASSID
 266         bool "Network classid cgroup"
 267         depends on CGROUPS
 268         select SOCK_CGROUP_DATA
 269         ---help---
 270           Cgroup subsystem for use as general purpose socket classid marker that is
 271           being used in cls_cgroup and for netfilter matching.
 272
 273 config NET_RX_BUSY_POLL
 274         bool
 275         default y
 276
 277 config BQL
 278         bool
 279         depends on SYSFS
 280         select DQL
 281         default y
 282
 283 config BPF_JIT
 284         bool "enable BPF Just In Time compiler"
 285         depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
 286         depends on MODULES
 287         ---help---
 288           Berkeley Packet Filter filtering capabilities are normally handled
 289           by an interpreter. This option allows kernel to generate a native
 290           code when filter is loaded in memory. This should speedup
 291           packet sniffing (libpcap/tcpdump).
 292
 293           Note, admin should enable this feature changing:
 294           /proc/sys/net/core/bpf_jit_enable
 295           /proc/sys/net/core/bpf_jit_harden   (optional)
 296           /proc/sys/net/core/bpf_jit_kallsyms (optional)
 297
 298 config BPF_STREAM_PARSER
 299         bool "enable BPF STREAM_PARSER"
 300         depends on BPF_SYSCALL
 301         select STREAM_PARSER
 302         ---help---
 303          Enabling this allows a stream parser to be used with
 304          BPF_MAP_TYPE_SOCKMAP.
 305
 306          BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
 307          It can be used to enforce socket policy, implement socket redirects,
 308          etc.
 309
 310 config NET_FLOW_LIMIT
 311         bool
 312         depends on RPS
 313         default y
 314         ---help---
 315           The network stack has to drop packets when a receive processing CPU's
 316           backlog reaches netdev_max_backlog. If a few out of many active flows
 317           generate the vast majority of load, drop their traffic earlier to
 318           maintain capacity for the other flows. This feature provides servers
 319           with many clients some protection against DoS by a single (spoofed)
 320           flow that greatly exceeds average workload.
 321
 322 menu "Network testing"
 323
 324 config NET_PKTGEN
 325         tristate "Packet Generator (USE WITH CAUTION)"
 326         depends on INET && PROC_FS
 327         ---help---
 328           This module will inject preconfigured packets, at a configurable
 329           rate, out of a given interface.  It is used for network interface
 330           stress testing and performance analysis.  If you don't understand
 331           what was just said, you don't need it: say N.
 332
 333           Documentation on how to use the packet generator can be found
 334           at <file:Documentation/networking/pktgen.txt>.
 335
 336           To compile this code as a module, choose M here: the
 337           module will be called pktgen.
 338
 339 config NET_TCPPROBE
 340         tristate "TCP connection probing"
 341         depends on INET && PROC_FS && KPROBES
 342         ---help---
 343         This module allows for capturing the changes to TCP connection
 344         state in response to incoming packets. It is used for debugging
 345         TCP congestion avoidance modules. If you don't understand
 346         what was just said, you don't need it: say N.
 347
 348         Documentation on how to use TCP connection probing can be found
 349         at:
 350
 351           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 352
 353         To compile this code as a module, choose M here: the
 354         module will be called tcp_probe.
 355
 356 config NET_DROP_MONITOR
 357         tristate "Network packet drop alerting service"
 358         depends on INET && TRACEPOINTS
 359         ---help---
 360         This feature provides an alerting service to userspace in the
 361         event that packets are discarded in the network stack.  Alerts
 362         are broadcast via netlink socket to any listening user space
 363         process.  If you don't need network drop alerts, or if you are ok
 364         just checking the various proc files and other utilities for
 365         drop statistics, say N here.
 366
 367 endmenu
 368
 369 endmenu
 370
 371 source "net/ax25/Kconfig"
 372 source "net/can/Kconfig"
 373 source "net/bluetooth/Kconfig"
 374 source "net/rxrpc/Kconfig"
 375 source "net/kcm/Kconfig"
 376 source "net/strparser/Kconfig"
 377
 378 config FIB_RULES
 379         bool
 380
 381 menuconfig WIRELESS
 382         bool "Wireless"
 383         depends on !S390
 384         default y
 385
 386 if WIRELESS
 387
 388 source "net/wireless/Kconfig"
 389 source "net/mac80211/Kconfig"
 390
 391 endif # WIRELESS
 392
 393 source "net/wimax/Kconfig"
 394
 395 source "net/rfkill/Kconfig"
 396 source "net/9p/Kconfig"
 397 source "net/caif/Kconfig"
 398 source "net/ceph/Kconfig"
 399 source "net/nfc/Kconfig"
 400 source "net/psample/Kconfig"
 401 source "net/ife/Kconfig"
 402
 403 config LWTUNNEL
 404         bool "Network light weight tunnels"
 405         ---help---
 406           This feature provides an infrastructure to support light weight
 407           tunnels like mpls. There is no netdevice associated with a light
 408           weight tunnel endpoint. Tunnel encapsulation parameters are stored
 409           with light weight tunnel state associated with fib routes.
 410
 411 config LWTUNNEL_BPF
 412         bool "Execute BPF program as route nexthop action"
 413         depends on LWTUNNEL
 414         default y if LWTUNNEL=y
 415         ---help---
 416           Allows to run BPF programs as a nexthop action following a route
 417           lookup for incoming and outgoing packets.
 418
 419 config DST_CACHE
 420         bool
 421         default n
 422
 423 config GRO_CELLS
 424         bool
 425         default n
 426
 427 config NET_DEVLINK
 428         tristate "Network physical/parent device Netlink interface"
 429         help
 430           Network physical/parent device Netlink interface provides
 431           infrastructure to support access to physical chip-wide config and
 432           monitoring.
 433
 434 config MAY_USE_DEVLINK
 435         tristate
 436         default m if NET_DEVLINK=m
 437         default y if NET_DEVLINK=y || NET_DEVLINK=n
 438         help
 439           Drivers using the devlink infrastructure should have a dependency
 440           on MAY_USE_DEVLINK to ensure they do not cause link errors when
 441           devlink is a loadable module and the driver using it is built-in.
 442
 443 endif   # if NET
 444
 445 # Used by archs to tell that they support BPF JIT compiler plus which flavour.
 446 # Only one of the two can be selected for a specific arch since eBPF JIT supersedes
 447 # the cBPF JIT.
 448
 449 # Classic BPF JIT (cBPF)
 450 config HAVE_CBPF_JIT
 451         bool
 452
 453 # Extended BPF JIT (eBPF)
 454 config HAVE_EBPF_JIT
 455         bool