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 menu "Networking options"
  49
  50 source "net/packet/Kconfig"
  51 source "net/unix/Kconfig"
  52 source "net/xfrm/Kconfig"
  53 source "net/iucv/Kconfig"
  54
  55 config INET
  56         bool "TCP/IP networking"
  57         select CRYPTO
  58         select CRYPTO_AES
  59         ---help---
  60           These are the protocols used on the Internet and on most local
  61           Ethernets. It is highly recommended to say Y here (this will enlarge
  62           your kernel by about 400 KB), since some programs (e.g. the X window
  63           system) use TCP/IP even if your machine is not connected to any
  64           other computer. You will get the so-called loopback device which
  65           allows you to ping yourself (great fun, that!).
  66
  67           For an excellent introduction to Linux networking, please read the
  68           Linux Networking HOWTO, available from
  69           <http://www.tldp.org/docs.html#howto>.
  70
  71           If you say Y here and also to "/proc file system support" and
  72           "Sysctl support" below, you can change various aspects of the
  73           behavior of the TCP/IP code by writing to the (virtual) files in
  74           /proc/sys/net/ipv4/*; the options are explained in the file
  75           <file:Documentation/networking/ip-sysctl.txt>.
  76
  77           Short answer: say Y.
  78
  79 if INET
  80 source "net/ipv4/Kconfig"
  81 source "net/ipv6/Kconfig"
  82 source "net/netlabel/Kconfig"
  83
  84 endif # if INET
  85
  86 config NETWORK_SECMARK
  87         bool "Security Marking"
  88         help
  89           This enables security marking of network packets, similar
  90           to nfmark, but designated for security purposes.
  91           If you are unsure how to answer this question, answer N.
  92
  93 config NET_PTP_CLASSIFY
  94         def_bool n
  95
  96 config NETWORK_PHY_TIMESTAMPING
  97         bool "Timestamping in PHY devices"
  98         select NET_PTP_CLASSIFY
  99         help
 100           This allows timestamping of network packets by PHYs with
 101           hardware timestamping capabilities. This option adds some
 102           overhead in the transmit and receive paths.
 103
 104           If you are unsure how to answer this question, answer N.
 105
 106 menuconfig NETFILTER
 107         bool "Network packet filtering framework (Netfilter)"
 108         ---help---
 109           Netfilter is a framework for filtering and mangling network packets
 110           that pass through your Linux box.
 111
 112           The most common use of packet filtering is to run your Linux box as
 113           a firewall protecting a local network from the Internet. The type of
 114           firewall provided by this kernel support is called a "packet
 115           filter", which means that it can reject individual network packets
 116           based on type, source, destination etc. The other kind of firewall,
 117           a "proxy-based" one, is more secure but more intrusive and more
 118           bothersome to set up; it inspects the network traffic much more
 119           closely, modifies it and has knowledge about the higher level
 120           protocols, which a packet filter lacks. Moreover, proxy-based
 121           firewalls often require changes to the programs running on the local
 122           clients. Proxy-based firewalls don't need support by the kernel, but
 123           they are often combined with a packet filter, which only works if
 124           you say Y here.
 125
 126           You should also say Y here if you intend to use your Linux box as
 127           the gateway to the Internet for a local network of machines without
 128           globally valid IP addresses. This is called "masquerading": if one
 129           of the computers on your local network wants to send something to
 130           the outside, your box can "masquerade" as that computer, i.e. it
 131           forwards the traffic to the intended outside destination, but
 132           modifies the packets to make it look like they came from the
 133           firewall box itself. It works both ways: if the outside host
 134           replies, the Linux box will silently forward the traffic to the
 135           correct local computer. This way, the computers on your local net
 136           are completely invisible to the outside world, even though they can
 137           reach the outside and can receive replies. It is even possible to
 138           run globally visible servers from within a masqueraded local network
 139           using a mechanism called portforwarding. Masquerading is also often
 140           called NAT (Network Address Translation).
 141
 142           Another use of Netfilter is in transparent proxying: if a machine on
 143           the local network tries to connect to an outside host, your Linux
 144           box can transparently forward the traffic to a local server,
 145           typically a caching proxy server.
 146
 147           Yet another use of Netfilter is building a bridging firewall. Using
 148           a bridge with Network packet filtering enabled makes iptables "see"
 149           the bridged traffic. For filtering on the lower network and Ethernet
 150           protocols over the bridge, use ebtables (under bridge netfilter
 151           configuration).
 152
 153           Various modules exist for netfilter which replace the previous
 154           masquerading (ipmasqadm), packet filtering (ipchains), transparent
 155           proxying, and portforwarding mechanisms. Please see
 156           <file:Documentation/Changes> under "iptables" for the location of
 157           these packages.
 158
 159 if NETFILTER
 160
 161 config NETFILTER_DEBUG
 162         bool "Network packet filtering debugging"
 163         depends on NETFILTER
 164         help
 165           You can say Y here if you want to get additional messages useful in
 166           debugging the netfilter code.
 167
 168 config NETFILTER_ADVANCED
 169         bool "Advanced netfilter configuration"
 170         depends on NETFILTER
 171         default y
 172         help
 173           If you say Y here you can select between all the netfilter modules.
 174           If you say N the more unusual ones will not be shown and the
 175           basic ones needed by most people will default to 'M'.
 176
 177           If unsure, say Y.
 178
 179 config BRIDGE_NETFILTER
 180         tristate "Bridged IP/ARP packets filtering"
 181         depends on BRIDGE
 182         depends on NETFILTER && INET
 183         depends on NETFILTER_ADVANCED
 184         default m
 185         ---help---
 186           Enabling this option will let arptables resp. iptables see bridged
 187           ARP resp. IP traffic. If you want a bridging firewall, you probably
 188           want this option enabled.
 189           Enabling or disabling this option doesn't enable or disable
 190           ebtables.
 191
 192           If unsure, say N.
 193
 194 source "net/netfilter/Kconfig"
 195 source "net/ipv4/netfilter/Kconfig"
 196 source "net/ipv6/netfilter/Kconfig"
 197 source "net/decnet/netfilter/Kconfig"
 198 source "net/bridge/netfilter/Kconfig"
 199
 200 endif
 201
 202 source "net/dccp/Kconfig"
 203 source "net/sctp/Kconfig"
 204 source "net/rds/Kconfig"
 205 source "net/tipc/Kconfig"
 206 source "net/atm/Kconfig"
 207 source "net/l2tp/Kconfig"
 208 source "net/802/Kconfig"
 209 source "net/bridge/Kconfig"
 210 source "net/dsa/Kconfig"
 211 source "net/8021q/Kconfig"
 212 source "net/decnet/Kconfig"
 213 source "net/llc/Kconfig"
 214 source "net/ipx/Kconfig"
 215 source "drivers/net/appletalk/Kconfig"
 216 source "net/x25/Kconfig"
 217 source "net/lapb/Kconfig"
 218 source "net/phonet/Kconfig"
 219 source "net/6lowpan/Kconfig"
 220 source "net/ieee802154/Kconfig"
 221 source "net/mac802154/Kconfig"
 222 source "net/sched/Kconfig"
 223 source "net/dcb/Kconfig"
 224 source "net/dns_resolver/Kconfig"
 225 source "net/batman-adv/Kconfig"
 226 source "net/openvswitch/Kconfig"
 227 source "net/vmw_vsock/Kconfig"
 228 source "net/netlink/Kconfig"
 229 source "net/mpls/Kconfig"
 230 source "net/hsr/Kconfig"
 231 source "net/switchdev/Kconfig"
 232
 233 config RPS
 234         bool
 235         depends on SMP && SYSFS
 236         default y
 237
 238 config RFS_ACCEL
 239         bool
 240         depends on RPS
 241         select CPU_RMAP
 242         default y
 243
 244 config XPS
 245         bool
 246         depends on SMP
 247         default y
 248
 249 config CGROUP_NET_PRIO
 250         bool "Network priority cgroup"
 251         depends on CGROUPS
 252         ---help---
 253           Cgroup subsystem for use in assigning processes to network priorities on
 254           a per-interface basis.
 255
 256 config CGROUP_NET_CLASSID
 257         bool "Network classid cgroup"
 258         depends on CGROUPS
 259         ---help---
 260           Cgroup subsystem for use as general purpose socket classid marker that is
 261           being used in cls_cgroup and for netfilter matching.
 262
 263 config NET_RX_BUSY_POLL
 264         bool
 265         default y
 266
 267 config BQL
 268         bool
 269         depends on SYSFS
 270         select DQL
 271         default y
 272
 273 config BPF_JIT
 274         bool "enable BPF Just In Time compiler"
 275         depends on HAVE_BPF_JIT
 276         depends on MODULES
 277         ---help---
 278           Berkeley Packet Filter filtering capabilities are normally handled
 279           by an interpreter. This option allows kernel to generate a native
 280           code when filter is loaded in memory. This should speedup
 281           packet sniffing (libpcap/tcpdump). Note : Admin should enable
 282           this feature changing /proc/sys/net/core/bpf_jit_enable
 283
 284 config NET_FLOW_LIMIT
 285         bool
 286         depends on RPS
 287         default y
 288         ---help---
 289           The network stack has to drop packets when a receive processing CPU's
 290           backlog reaches netdev_max_backlog. If a few out of many active flows
 291           generate the vast majority of load, drop their traffic earlier to
 292           maintain capacity for the other flows. This feature provides servers
 293           with many clients some protection against DoS by a single (spoofed)
 294           flow that greatly exceeds average workload.
 295
 296 menu "Network testing"
 297
 298 config NET_PKTGEN
 299         tristate "Packet Generator (USE WITH CAUTION)"
 300         depends on INET && PROC_FS
 301         ---help---
 302           This module will inject preconfigured packets, at a configurable
 303           rate, out of a given interface.  It is used for network interface
 304           stress testing and performance analysis.  If you don't understand
 305           what was just said, you don't need it: say N.
 306
 307           Documentation on how to use the packet generator can be found
 308           at <file:Documentation/networking/pktgen.txt>.
 309
 310           To compile this code as a module, choose M here: the
 311           module will be called pktgen.
 312
 313 config NET_TCPPROBE
 314         tristate "TCP connection probing"
 315         depends on INET && PROC_FS && KPROBES
 316         ---help---
 317         This module allows for capturing the changes to TCP connection
 318         state in response to incoming packets. It is used for debugging
 319         TCP congestion avoidance modules. If you don't understand
 320         what was just said, you don't need it: say N.
 321
 322         Documentation on how to use TCP connection probing can be found
 323         at:
 324
 325           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 326
 327         To compile this code as a module, choose M here: the
 328         module will be called tcp_probe.
 329
 330 config NET_DROP_MONITOR
 331         tristate "Network packet drop alerting service"
 332         depends on INET && TRACEPOINTS
 333         ---help---
 334         This feature provides an alerting service to userspace in the
 335         event that packets are discarded in the network stack.  Alerts
 336         are broadcast via netlink socket to any listening user space
 337         process.  If you don't need network drop alerts, or if you are ok
 338         just checking the various proc files and other utilities for
 339         drop statistics, say N here.
 340
 341 endmenu
 342
 343 endmenu
 344
 345 source "net/ax25/Kconfig"
 346 source "net/can/Kconfig"
 347 source "net/irda/Kconfig"
 348 source "net/bluetooth/Kconfig"
 349 source "net/rxrpc/Kconfig"
 350
 351 config FIB_RULES
 352         bool
 353
 354 menuconfig WIRELESS
 355         bool "Wireless"
 356         depends on !S390
 357         default y
 358
 359 if WIRELESS
 360
 361 source "net/wireless/Kconfig"
 362 source "net/mac80211/Kconfig"
 363
 364 endif # WIRELESS
 365
 366 source "net/wimax/Kconfig"
 367
 368 source "net/rfkill/Kconfig"
 369 source "net/9p/Kconfig"
 370 source "net/caif/Kconfig"
 371 source "net/ceph/Kconfig"
 372 source "net/nfc/Kconfig"
 373
 374
 375 endif   # if NET
 376
 377 # Used by archs to tell that they support BPF_JIT
 378 config HAVE_BPF_JIT
 379         bool