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 source "net/xdp/Kconfig"
  63
  64 config INET
  65         bool "TCP/IP networking"
  66         select CRYPTO
  67         select CRYPTO_AES
  68         ---help---
  69           These are the protocols used on the Internet and on most local
  70           Ethernets. It is highly recommended to say Y here (this will enlarge
  71           your kernel by about 400 KB), since some programs (e.g. the X window
  72           system) use TCP/IP even if your machine is not connected to any
  73           other computer. You will get the so-called loopback device which
  74           allows you to ping yourself (great fun, that!).
  75
  76           For an excellent introduction to Linux networking, please read the
  77           Linux Networking HOWTO, available from
  78           <http://www.tldp.org/docs.html#howto>.
  79
  80           If you say Y here and also to "/proc file system support" and
  81           "Sysctl support" below, you can change various aspects of the
  82           behavior of the TCP/IP code by writing to the (virtual) files in
  83           /proc/sys/net/ipv4/*; the options are explained in the file
  84           <file:Documentation/networking/ip-sysctl.txt>.
  85
  86           Short answer: say Y.
  87
  88 if INET
  89 source "net/ipv4/Kconfig"
  90 source "net/ipv6/Kconfig"
  91 source "net/netlabel/Kconfig"
  92
  93 endif # if INET
  94
  95 config NETWORK_SECMARK
  96         bool "Security Marking"
  97         help
  98           This enables security marking of network packets, similar
  99           to nfmark, but designated for security purposes.
 100           If you are unsure how to answer this question, answer N.
 101
 102 config NET_PTP_CLASSIFY
 103         def_bool n
 104
 105 config NETWORK_PHY_TIMESTAMPING
 106         bool "Timestamping in PHY devices"
 107         select NET_PTP_CLASSIFY
 108         help
 109           This allows timestamping of network packets by PHYs with
 110           hardware timestamping capabilities. This option adds some
 111           overhead in the transmit and receive paths.
 112
 113           If you are unsure how to answer this question, answer N.
 114
 115 menuconfig NETFILTER
 116         bool "Network packet filtering framework (Netfilter)"
 117         ---help---
 118           Netfilter is a framework for filtering and mangling network packets
 119           that pass through your Linux box.
 120
 121           The most common use of packet filtering is to run your Linux box as
 122           a firewall protecting a local network from the Internet. The type of
 123           firewall provided by this kernel support is called a "packet
 124           filter", which means that it can reject individual network packets
 125           based on type, source, destination etc. The other kind of firewall,
 126           a "proxy-based" one, is more secure but more intrusive and more
 127           bothersome to set up; it inspects the network traffic much more
 128           closely, modifies it and has knowledge about the higher level
 129           protocols, which a packet filter lacks. Moreover, proxy-based
 130           firewalls often require changes to the programs running on the local
 131           clients. Proxy-based firewalls don't need support by the kernel, but
 132           they are often combined with a packet filter, which only works if
 133           you say Y here.
 134
 135           You should also say Y here if you intend to use your Linux box as
 136           the gateway to the Internet for a local network of machines without
 137           globally valid IP addresses. This is called "masquerading": if one
 138           of the computers on your local network wants to send something to
 139           the outside, your box can "masquerade" as that computer, i.e. it
 140           forwards the traffic to the intended outside destination, but
 141           modifies the packets to make it look like they came from the
 142           firewall box itself. It works both ways: if the outside host
 143           replies, the Linux box will silently forward the traffic to the
 144           correct local computer. This way, the computers on your local net
 145           are completely invisible to the outside world, even though they can
 146           reach the outside and can receive replies. It is even possible to
 147           run globally visible servers from within a masqueraded local network
 148           using a mechanism called portforwarding. Masquerading is also often
 149           called NAT (Network Address Translation).
 150
 151           Another use of Netfilter is in transparent proxying: if a machine on
 152           the local network tries to connect to an outside host, your Linux
 153           box can transparently forward the traffic to a local server,
 154           typically a caching proxy server.
 155
 156           Yet another use of Netfilter is building a bridging firewall. Using
 157           a bridge with Network packet filtering enabled makes iptables "see"
 158           the bridged traffic. For filtering on the lower network and Ethernet
 159           protocols over the bridge, use ebtables (under bridge netfilter
 160           configuration).
 161
 162           Various modules exist for netfilter which replace the previous
 163           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 164           proxying, and portforwarding mechanisms. Please see
 165           <file:Documentation/Changes> under "iptables" for the location of
 166           these packages.
 167
 168 if NETFILTER
 169
 170 config NETFILTER_ADVANCED
 171         bool "Advanced netfilter configuration"
 172         depends on NETFILTER
 173         default y
 174         help
 175           If you say Y here you can select between all the netfilter modules.
 176           If you say N the more unusual ones will not be shown and the
 177           basic ones needed by most people will default to 'M'.
 178
 179           If unsure, say Y.
 180
 181 config BRIDGE_NETFILTER
 182         tristate "Bridged IP/ARP packets filtering"
 183         depends on BRIDGE
 184         depends on NETFILTER && INET
 185         depends on NETFILTER_ADVANCED
 186         select NETFILTER_FAMILY_BRIDGE
 187         default m
 188         ---help---
 189           Enabling this option will let arptables resp. iptables see bridged
 190           ARP resp. IP traffic. If you want a bridging firewall, you probably
 191           want this option enabled.
 192           Enabling or disabling this option doesn't enable or disable
 193           ebtables.
 194
 195           If unsure, say N.
 196
 197 source "net/netfilter/Kconfig"
 198 source "net/ipv4/netfilter/Kconfig"
 199 source "net/ipv6/netfilter/Kconfig"
 200 source "net/decnet/netfilter/Kconfig"
 201 source "net/bridge/netfilter/Kconfig"
 202
 203 endif
 204
 205 source "net/bpfilter/Kconfig"
 206
 207 source "net/dccp/Kconfig"
 208 source "net/sctp/Kconfig"
 209 source "net/rds/Kconfig"
 210 source "net/tipc/Kconfig"
 211 source "net/atm/Kconfig"
 212 source "net/l2tp/Kconfig"
 213 source "net/802/Kconfig"
 214 source "net/bridge/Kconfig"
 215 source "net/dsa/Kconfig"
 216 source "net/8021q/Kconfig"
 217 source "net/decnet/Kconfig"
 218 source "net/llc/Kconfig"
 219 source "drivers/net/appletalk/Kconfig"
 220 source "net/x25/Kconfig"
 221 source "net/lapb/Kconfig"
 222 source "net/phonet/Kconfig"
 223 source "net/6lowpan/Kconfig"
 224 source "net/ieee802154/Kconfig"
 225 source "net/mac802154/Kconfig"
 226 source "net/sched/Kconfig"
 227 source "net/dcb/Kconfig"
 228 source "net/dns_resolver/Kconfig"
 229 source "net/batman-adv/Kconfig"
 230 source "net/openvswitch/Kconfig"
 231 source "net/vmw_vsock/Kconfig"
 232 source "net/netlink/Kconfig"
 233 source "net/mpls/Kconfig"
 234 source "net/nsh/Kconfig"
 235 source "net/hsr/Kconfig"
 236 source "net/switchdev/Kconfig"
 237 source "net/l3mdev/Kconfig"
 238 source "net/qrtr/Kconfig"
 239 source "net/ncsi/Kconfig"
 240
 241 config RPS
 242         bool
 243         depends on SMP && SYSFS
 244         default y
 245
 246 config RFS_ACCEL
 247         bool
 248         depends on RPS
 249         select CPU_RMAP
 250         default y
 251
 252 config XPS
 253         bool
 254         depends on SMP
 255         default y
 256
 257 config HWBM
 258        bool
 259
 260 config CGROUP_NET_PRIO
 261         bool "Network priority cgroup"
 262         depends on CGROUPS
 263         select SOCK_CGROUP_DATA
 264         ---help---
 265           Cgroup subsystem for use in assigning processes to network priorities on
 266           a per-interface basis.
 267
 268 config CGROUP_NET_CLASSID
 269         bool "Network classid cgroup"
 270         depends on CGROUPS
 271         select SOCK_CGROUP_DATA
 272         ---help---
 273           Cgroup subsystem for use as general purpose socket classid marker that is
 274           being used in cls_cgroup and for netfilter matching.
 275
 276 config NET_RX_BUSY_POLL
 277         bool
 278         default y
 279
 280 config BQL
 281         bool
 282         depends on SYSFS
 283         select DQL
 284         default y
 285
 286 config BPF_JIT
 287         bool "enable BPF Just In Time compiler"
 288         depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
 289         depends on MODULES
 290         ---help---
 291           Berkeley Packet Filter filtering capabilities are normally handled
 292           by an interpreter. This option allows kernel to generate a native
 293           code when filter is loaded in memory. This should speedup
 294           packet sniffing (libpcap/tcpdump).
 295
 296           Note, admin should enable this feature changing:
 297           /proc/sys/net/core/bpf_jit_enable
 298           /proc/sys/net/core/bpf_jit_harden   (optional)
 299           /proc/sys/net/core/bpf_jit_kallsyms (optional)
 300
 301 config BPF_STREAM_PARSER
 302         bool "enable BPF STREAM_PARSER"
 303         depends on BPF_SYSCALL
 304         select STREAM_PARSER
 305         ---help---
 306          Enabling this allows a stream parser to be used with
 307          BPF_MAP_TYPE_SOCKMAP.
 308
 309          BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets.
 310          It can be used to enforce socket policy, implement socket redirects,
 311          etc.
 312
 313 config NET_FLOW_LIMIT
 314         bool
 315         depends on RPS
 316         default y
 317         ---help---
 318           The network stack has to drop packets when a receive processing CPU's
 319           backlog reaches netdev_max_backlog. If a few out of many active flows
 320           generate the vast majority of load, drop their traffic earlier to
 321           maintain capacity for the other flows. This feature provides servers
 322           with many clients some protection against DoS by a single (spoofed)
 323           flow that greatly exceeds average workload.
 324
 325 menu "Network testing"
 326
 327 config NET_PKTGEN
 328         tristate "Packet Generator (USE WITH CAUTION)"
 329         depends on INET && PROC_FS
 330         ---help---
 331           This module will inject preconfigured packets, at a configurable
 332           rate, out of a given interface.  It is used for network interface
 333           stress testing and performance analysis.  If you don't understand
 334           what was just said, you don't need it: say N.
 335
 336           Documentation on how to use the packet generator can be found
 337           at <file:Documentation/networking/pktgen.txt>.
 338
 339           To compile this code as a module, choose M here: the
 340           module will be called pktgen.
 341
 342 config NET_DROP_MONITOR
 343         tristate "Network packet drop alerting service"
 344         depends on INET && TRACEPOINTS
 345         ---help---
 346         This feature provides an alerting service to userspace in the
 347         event that packets are discarded in the network stack.  Alerts
 348         are broadcast via netlink socket to any listening user space
 349         process.  If you don't need network drop alerts, or if you are ok
 350         just checking the various proc files and other utilities for
 351         drop statistics, say N here.
 352
 353 endmenu
 354
 355 endmenu
 356
 357 source "net/ax25/Kconfig"
 358 source "net/can/Kconfig"
 359 source "net/bluetooth/Kconfig"
 360 source "net/rxrpc/Kconfig"
 361 source "net/kcm/Kconfig"
 362 source "net/strparser/Kconfig"
 363
 364 config FIB_RULES
 365         bool
 366
 367 menuconfig WIRELESS
 368         bool "Wireless"
 369         depends on !S390
 370         default y
 371
 372 if WIRELESS
 373
 374 source "net/wireless/Kconfig"
 375 source "net/mac80211/Kconfig"
 376
 377 endif # WIRELESS
 378
 379 source "net/wimax/Kconfig"
 380
 381 source "net/rfkill/Kconfig"
 382 source "net/9p/Kconfig"
 383 source "net/caif/Kconfig"
 384 source "net/ceph/Kconfig"
 385 source "net/nfc/Kconfig"
 386 source "net/psample/Kconfig"
 387 source "net/ife/Kconfig"
 388
 389 config LWTUNNEL
 390         bool "Network light weight tunnels"
 391         ---help---
 392           This feature provides an infrastructure to support light weight
 393           tunnels like mpls. There is no netdevice associated with a light
 394           weight tunnel endpoint. Tunnel encapsulation parameters are stored
 395           with light weight tunnel state associated with fib routes.
 396
 397 config LWTUNNEL_BPF
 398         bool "Execute BPF program as route nexthop action"
 399         depends on LWTUNNEL
 400         default y if LWTUNNEL=y
 401         ---help---
 402           Allows to run BPF programs as a nexthop action following a route
 403           lookup for incoming and outgoing packets.
 404
 405 config DST_CACHE
 406         bool
 407         default n
 408
 409 config GRO_CELLS
 410         bool
 411         default n
 412
 413 config SOCK_VALIDATE_XMIT
 414         bool
 415
 416 config NET_DEVLINK
 417         tristate "Network physical/parent device Netlink interface"
 418         help
 419           Network physical/parent device Netlink interface provides
 420           infrastructure to support access to physical chip-wide config and
 421           monitoring.
 422
 423 config MAY_USE_DEVLINK
 424         tristate
 425         default m if NET_DEVLINK=m
 426         default y if NET_DEVLINK=y || NET_DEVLINK=n
 427         help
 428           Drivers using the devlink infrastructure should have a dependency
 429           on MAY_USE_DEVLINK to ensure they do not cause link errors when
 430           devlink is a loadable module and the driver using it is built-in.
 431
 432 config PAGE_POOL
 433        bool
 434
 435 config FAILOVER
 436         tristate "Generic failover module"
 437         help
 438           The failover module provides a generic interface for paravirtual
 439           drivers to register a netdev and a set of ops with a failover
 440           instance. The ops are used as event handlers that get called to
 441           handle netdev register/unregister/link change/name change events
 442           on slave pci ethernet devices with the same mac address as the
 443           failover netdev. This enables paravirtual drivers to use a
 444           VF as an accelerated low latency datapath. It also allows live
 445           migration of VMs with direct attached VFs by failing over to the
 446           paravirtual datapath when the VF is unplugged.
 447
 448 endif   # if NET
 449
 450 # Used by archs to tell that they support BPF JIT compiler plus which flavour.
 451 # Only one of the two can be selected for a specific arch since eBPF JIT supersedes
 452 # the cBPF JIT.
 453
 454 # Classic BPF JIT (cBPF)
 455 config HAVE_CBPF_JIT
 456         bool
 457
 458 # Extended BPF JIT (eBPF)
 459 config HAVE_EBPF_JIT
 460         bool