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 menu "Networking options"
  52
  53 source "net/packet/Kconfig"
  54 source "net/unix/Kconfig"
  55 source "net/xfrm/Kconfig"
  56 source "net/iucv/Kconfig"
  57
  58 config INET
  59         bool "TCP/IP networking"
  60         select CRYPTO
  61         select CRYPTO_AES
  62         ---help---
  63           These are the protocols used on the Internet and on most local
  64           Ethernets. It is highly recommended to say Y here (this will enlarge
  65           your kernel by about 400 KB), since some programs (e.g. the X window
  66           system) use TCP/IP even if your machine is not connected to any
  67           other computer. You will get the so-called loopback device which
  68           allows you to ping yourself (great fun, that!).
  69
  70           For an excellent introduction to Linux networking, please read the
  71           Linux Networking HOWTO, available from
  72           <http://www.tldp.org/docs.html#howto>.
  73
  74           If you say Y here and also to "/proc file system support" and
  75           "Sysctl support" below, you can change various aspects of the
  76           behavior of the TCP/IP code by writing to the (virtual) files in
  77           /proc/sys/net/ipv4/*; the options are explained in the file
  78           <file:Documentation/networking/ip-sysctl.txt>.
  79
  80           Short answer: say Y.
  81
  82 if INET
  83 source "net/ipv4/Kconfig"
  84 source "net/ipv6/Kconfig"
  85 source "net/netlabel/Kconfig"
  86
  87 endif # if INET
  88
  89 config NETWORK_SECMARK
  90         bool "Security Marking"
  91         help
  92           This enables security marking of network packets, similar
  93           to nfmark, but designated for security purposes.
  94           If you are unsure how to answer this question, answer N.
  95
  96 config NET_PTP_CLASSIFY
  97         def_bool n
  98
  99 config NETWORK_PHY_TIMESTAMPING
 100         bool "Timestamping in PHY devices"
 101         select NET_PTP_CLASSIFY
 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         tristate "Bridged IP/ARP packets filtering"
 184         depends on BRIDGE
 185         depends on NETFILTER && INET
 186         depends on NETFILTER_ADVANCED
 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/dccp/Kconfig"
 206 source "net/sctp/Kconfig"
 207 source "net/rds/Kconfig"
 208 source "net/tipc/Kconfig"
 209 source "net/atm/Kconfig"
 210 source "net/l2tp/Kconfig"
 211 source "net/802/Kconfig"
 212 source "net/bridge/Kconfig"
 213 source "net/dsa/Kconfig"
 214 source "net/8021q/Kconfig"
 215 source "net/decnet/Kconfig"
 216 source "net/llc/Kconfig"
 217 source "net/ipx/Kconfig"
 218 source "drivers/net/appletalk/Kconfig"
 219 source "net/x25/Kconfig"
 220 source "net/lapb/Kconfig"
 221 source "net/phonet/Kconfig"
 222 source "net/6lowpan/Kconfig"
 223 source "net/ieee802154/Kconfig"
 224 source "net/mac802154/Kconfig"
 225 source "net/sched/Kconfig"
 226 source "net/dcb/Kconfig"
 227 source "net/dns_resolver/Kconfig"
 228 source "net/batman-adv/Kconfig"
 229 source "net/openvswitch/Kconfig"
 230 source "net/vmw_vsock/Kconfig"
 231 source "net/netlink/Kconfig"
 232 source "net/mpls/Kconfig"
 233 source "net/hsr/Kconfig"
 234 source "net/switchdev/Kconfig"
 235 source "net/l3mdev/Kconfig"
 236
 237 config RPS
 238         bool
 239         depends on SMP && SYSFS
 240         default y
 241
 242 config RFS_ACCEL
 243         bool
 244         depends on RPS
 245         select CPU_RMAP
 246         default y
 247
 248 config XPS
 249         bool
 250         depends on SMP
 251         default y
 252
 253 config CGROUP_NET_PRIO
 254         bool "Network priority cgroup"
 255         depends on CGROUPS
 256         ---help---
 257           Cgroup subsystem for use in assigning processes to network priorities on
 258           a per-interface basis.
 259
 260 config CGROUP_NET_CLASSID
 261         bool "Network classid cgroup"
 262         depends on CGROUPS
 263         ---help---
 264           Cgroup subsystem for use as general purpose socket classid marker that is
 265           being used in cls_cgroup and for netfilter matching.
 266
 267 config NET_RX_BUSY_POLL
 268         bool
 269         default y
 270
 271 config BQL
 272         bool
 273         depends on SYSFS
 274         select DQL
 275         default y
 276
 277 config BPF_JIT
 278         bool "enable BPF Just In Time compiler"
 279         depends on HAVE_BPF_JIT
 280         depends on MODULES
 281         ---help---
 282           Berkeley Packet Filter filtering capabilities are normally handled
 283           by an interpreter. This option allows kernel to generate a native
 284           code when filter is loaded in memory. This should speedup
 285           packet sniffing (libpcap/tcpdump).
 286
 287           Note, admin should enable this feature changing:
 288           /proc/sys/net/core/bpf_jit_enable
 289           /proc/sys/net/core/bpf_jit_harden (optional)
 290
 291 config NET_FLOW_LIMIT
 292         bool
 293         depends on RPS
 294         default y
 295         ---help---
 296           The network stack has to drop packets when a receive processing CPU's
 297           backlog reaches netdev_max_backlog. If a few out of many active flows
 298           generate the vast majority of load, drop their traffic earlier to
 299           maintain capacity for the other flows. This feature provides servers
 300           with many clients some protection against DoS by a single (spoofed)
 301           flow that greatly exceeds average workload.
 302
 303 menu "Network testing"
 304
 305 config NET_PKTGEN
 306         tristate "Packet Generator (USE WITH CAUTION)"
 307         depends on INET && PROC_FS
 308         ---help---
 309           This module will inject preconfigured packets, at a configurable
 310           rate, out of a given interface.  It is used for network interface
 311           stress testing and performance analysis.  If you don't understand
 312           what was just said, you don't need it: say N.
 313
 314           Documentation on how to use the packet generator can be found
 315           at <file:Documentation/networking/pktgen.txt>.
 316
 317           To compile this code as a module, choose M here: the
 318           module will be called pktgen.
 319
 320 config NET_TCPPROBE
 321         tristate "TCP connection probing"
 322         depends on INET && PROC_FS && KPROBES
 323         ---help---
 324         This module allows for capturing the changes to TCP connection
 325         state in response to incoming packets. It is used for debugging
 326         TCP congestion avoidance modules. If you don't understand
 327         what was just said, you don't need it: say N.
 328
 329         Documentation on how to use TCP connection probing can be found
 330         at:
 331
 332           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 333
 334         To compile this code as a module, choose M here: the
 335         module will be called tcp_probe.
 336
 337 config NET_DROP_MONITOR
 338         tristate "Network packet drop alerting service"
 339         depends on INET && TRACEPOINTS
 340         ---help---
 341         This feature provides an alerting service to userspace in the
 342         event that packets are discarded in the network stack.  Alerts
 343         are broadcast via netlink socket to any listening user space
 344         process.  If you don't need network drop alerts, or if you are ok
 345         just checking the various proc files and other utilities for
 346         drop statistics, say N here.
 347
 348 endmenu
 349
 350 endmenu
 351
 352 source "net/ax25/Kconfig"
 353 source "net/can/Kconfig"
 354 source "net/irda/Kconfig"
 355 source "net/bluetooth/Kconfig"
 356 source "net/rxrpc/Kconfig"
 357
 358 config FIB_RULES
 359         bool
 360
 361 menuconfig WIRELESS
 362         bool "Wireless"
 363         depends on !S390
 364         default y
 365
 366 if WIRELESS
 367
 368 source "net/wireless/Kconfig"
 369 source "net/mac80211/Kconfig"
 370
 371 endif # WIRELESS
 372
 373 source "net/wimax/Kconfig"
 374
 375 source "net/rfkill/Kconfig"
 376 source "net/9p/Kconfig"
 377 source "net/caif/Kconfig"
 378 source "net/ceph/Kconfig"
 379 source "net/nfc/Kconfig"
 380
 381 config LWTUNNEL
 382         bool "Network light weight tunnels"
 383         ---help---
 384           This feature provides an infrastructure to support light weight
 385           tunnels like mpls. There is no netdevice associated with a light
 386           weight tunnel endpoint. Tunnel encapsulation parameters are stored
 387           with light weight tunnel state associated with fib routes.
 388
 389 endif   # if NET
 390
 391 # Used by archs to tell that they support BPF_JIT
 392 config HAVE_BPF_JIT
 393         bool
 394
 395 config HAVE_EBPF_JIT
 396         bool