net/Kconfig

   1 #
   2 # Network configuration
   3 #
   4
   5 menuconfig 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
  25 if NET
  26
  27 config WANT_COMPAT_NETLINK_MESSAGES
  28         bool
  29         help
  30           This option can be selected by other options that need compat
  31           netlink messages.
  32
  33 config 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
  47 menu "Networking options"
  48
  49 source "net/packet/Kconfig"
  50 source "net/unix/Kconfig"
  51 source "net/xfrm/Kconfig"
  52 source "net/iucv/Kconfig"
  53
  54 config 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
  78 if INET
  79 source "net/ipv4/Kconfig"
  80 source "net/ipv6/Kconfig"
  81 source "net/netlabel/Kconfig"
  82
  83 endif # if INET
  84
  85 config 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
  92 config 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
 101 menuconfig 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
 154 if NETFILTER
 155
 156 config 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
 163 config 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
 174 config 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
 188 source "net/netfilter/Kconfig"
 189 source "net/ipv4/netfilter/Kconfig"
 190 source "net/ipv6/netfilter/Kconfig"
 191 source "net/decnet/netfilter/Kconfig"
 192 source "net/bridge/netfilter/Kconfig"
 193
 194 endif
 195
 196 source "net/dccp/Kconfig"
 197 source "net/sctp/Kconfig"
 198 source "net/rds/Kconfig"
 199 source "net/tipc/Kconfig"
 200 source "net/atm/Kconfig"
 201 source "net/l2tp/Kconfig"
 202 source "net/802/Kconfig"
 203 source "net/bridge/Kconfig"
 204 source "net/dsa/Kconfig"
 205 source "net/8021q/Kconfig"
 206 source "net/decnet/Kconfig"
 207 source "net/llc/Kconfig"
 208 source "net/ipx/Kconfig"
 209 source "drivers/net/appletalk/Kconfig"
 210 source "net/x25/Kconfig"
 211 source "net/lapb/Kconfig"
 212 source "net/phonet/Kconfig"
 213 source "net/ieee802154/Kconfig"
 214 source "net/mac802154/Kconfig"
 215 source "net/sched/Kconfig"
 216 source "net/dcb/Kconfig"
 217 source "net/dns_resolver/Kconfig"
 218 source "net/batman-adv/Kconfig"
 219 source "net/openvswitch/Kconfig"
 220 source "net/vmw_vsock/Kconfig"
 221 source "net/netlink/Kconfig"
 222 source "net/mpls/Kconfig"
 223 source "net/hsr/Kconfig"
 224
 225 config RPS
 226         boolean
 227         depends on SMP && SYSFS
 228         default y
 229
 230 config RFS_ACCEL
 231         boolean
 232         depends on RPS
 233         select CPU_RMAP
 234         default y
 235
 236 config XPS
 237         boolean
 238         depends on SMP
 239         default y
 240
 241 config CGROUP_NET_PRIO
 242         tristate "Network priority cgroup"
 243         depends on CGROUPS
 244         ---help---
 245           Cgroup subsystem for use in assigning processes to network priorities on
 246           a per-interface basis.
 247
 248 config CGROUP_NET_CLASSID
 249         boolean "Network classid cgroup"
 250         depends on CGROUPS
 251         ---help---
 252           Cgroup subsystem for use as general purpose socket classid marker that is
 253           being used in cls_cgroup and for netfilter matching.
 254
 255 config NET_RX_BUSY_POLL
 256         boolean
 257         default y
 258
 259 config BQL
 260         boolean
 261         depends on SYSFS
 262         select DQL
 263         default y
 264
 265 config BPF_JIT
 266         bool "enable BPF Just In Time compiler"
 267         depends on HAVE_BPF_JIT
 268         depends on MODULES
 269         ---help---
 270           Berkeley Packet Filter filtering capabilities are normally handled
 271           by an interpreter. This option allows kernel to generate a native
 272           code when filter is loaded in memory. This should speedup
 273           packet sniffing (libpcap/tcpdump). Note : Admin should enable
 274           this feature changing /proc/sys/net/core/bpf_jit_enable
 275
 276 config NET_FLOW_LIMIT
 277         boolean
 278         depends on RPS
 279         default y
 280         ---help---
 281           The network stack has to drop packets when a receive processing CPU's
 282           backlog reaches netdev_max_backlog. If a few out of many active flows
 283           generate the vast majority of load, drop their traffic earlier to
 284           maintain capacity for the other flows. This feature provides servers
 285           with many clients some protection against DoS by a single (spoofed)
 286           flow that greatly exceeds average workload.
 287
 288 menu "Network testing"
 289
 290 config NET_PKTGEN
 291         tristate "Packet Generator (USE WITH CAUTION)"
 292         depends on INET && PROC_FS
 293         ---help---
 294           This module will inject preconfigured packets, at a configurable
 295           rate, out of a given interface.  It is used for network interface
 296           stress testing and performance analysis.  If you don't understand
 297           what was just said, you don't need it: say N.
 298
 299           Documentation on how to use the packet generator can be found
 300           at <file:Documentation/networking/pktgen.txt>.
 301
 302           To compile this code as a module, choose M here: the
 303           module will be called pktgen.
 304
 305 config NET_TCPPROBE
 306         tristate "TCP connection probing"
 307         depends on INET && PROC_FS && KPROBES
 308         ---help---
 309         This module allows for capturing the changes to TCP connection
 310         state in response to incoming packets. It is used for debugging
 311         TCP congestion avoidance modules. If you don't understand
 312         what was just said, you don't need it: say N.
 313
 314         Documentation on how to use TCP connection probing can be found
 315         at:
 316
 317           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
 318
 319         To compile this code as a module, choose M here: the
 320         module will be called tcp_probe.
 321
 322 config NET_DROP_MONITOR
 323         tristate "Network packet drop alerting service"
 324         depends on INET && TRACEPOINTS
 325         ---help---
 326         This feature provides an alerting service to userspace in the
 327         event that packets are discarded in the network stack.  Alerts
 328         are broadcast via netlink socket to any listening user space
 329         process.  If you don't need network drop alerts, or if you are ok
 330         just checking the various proc files and other utilities for
 331         drop statistics, say N here.
 332
 333 endmenu
 334
 335 endmenu
 336
 337 source "net/ax25/Kconfig"
 338 source "net/can/Kconfig"
 339 source "net/irda/Kconfig"
 340 source "net/bluetooth/Kconfig"
 341 source "net/rxrpc/Kconfig"
 342
 343 config FIB_RULES
 344         bool
 345
 346 menuconfig WIRELESS
 347         bool "Wireless"
 348         depends on !S390
 349         default y
 350
 351 if WIRELESS
 352
 353 source "net/wireless/Kconfig"
 354 source "net/mac80211/Kconfig"
 355
 356 endif # WIRELESS
 357
 358 source "net/wimax/Kconfig"
 359
 360 source "net/rfkill/Kconfig"
 361 source "net/9p/Kconfig"
 362 source "net/caif/Kconfig"
 363 source "net/ceph/Kconfig"
 364 source "net/nfc/Kconfig"
 365
 366
 367 endif   # if NET
 368
 369 # Used by archs to tell that they support BPF_JIT
 370 config HAVE_BPF_JIT
 371         bool