1# 2# Network configuration 3# 4 5menuconfig 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 26if NET 27 28config WANT_COMPAT_NETLINK_MESSAGES 29 bool 30 help 31 This option can be selected by other options that need compat 32 netlink messages. 33 34config 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 48config NET_INGRESS 49 bool 50 51config NET_EGRESS 52 bool 53 54config SKB_EXTENSIONS 55 bool 56 57menu "Networking options" 58 59source "net/packet/Kconfig" 60source "net/unix/Kconfig" 61source "net/tls/Kconfig" 62source "net/xfrm/Kconfig" 63source "net/iucv/Kconfig" 64source "net/smc/Kconfig" 65source "net/xdp/Kconfig" 66 67config INET 68 bool "TCP/IP networking" 69 select CRYPTO 70 select CRYPTO_AES 71 ---help--- 72 These are the protocols used on the Internet and on most local 73 Ethernets. It is highly recommended to say Y here (this will enlarge 74 your kernel by about 400 KB), since some programs (e.g. the X window 75 system) use TCP/IP even if your machine is not connected to any 76 other computer. You will get the so-called loopback device which 77 allows you to ping yourself (great fun, that!). 78 79 For an excellent introduction to Linux networking, please read the 80 Linux Networking HOWTO, available from 81 <http://www.tldp.org/docs.html#howto>. 82 83 If you say Y here and also to "/proc file system support" and 84 "Sysctl support" below, you can change various aspects of the 85 behavior of the TCP/IP code by writing to the (virtual) files in 86 /proc/sys/net/ipv4/*; the options are explained in the file 87 <file:Documentation/networking/ip-sysctl.txt>. 88 89 Short answer: say Y. 90 91if INET 92source "net/ipv4/Kconfig" 93source "net/ipv6/Kconfig" 94source "net/netlabel/Kconfig" 95 96endif # if INET 97 98config NETWORK_SECMARK 99 bool "Security Marking" 100 help 101 This enables security marking of network packets, similar 102 to nfmark, but designated for security purposes. 103 If you are unsure how to answer this question, answer N. 104 105config NET_PTP_CLASSIFY 106 def_bool n 107 108config NETWORK_PHY_TIMESTAMPING 109 bool "Timestamping in PHY devices" 110 select NET_PTP_CLASSIFY 111 help 112 This allows timestamping of network packets by PHYs with 113 hardware timestamping capabilities. This option adds some 114 overhead in the transmit and receive paths. 115 116 If you are unsure how to answer this question, answer N. 117 118menuconfig NETFILTER 119 bool "Network packet filtering framework (Netfilter)" 120 ---help--- 121 Netfilter is a framework for filtering and mangling network packets 122 that pass through your Linux box. 123 124 The most common use of packet filtering is to run your Linux box as 125 a firewall protecting a local network from the Internet. The type of 126 firewall provided by this kernel support is called a "packet 127 filter", which means that it can reject individual network packets 128 based on type, source, destination etc. The other kind of firewall, 129 a "proxy-based" one, is more secure but more intrusive and more 130 bothersome to set up; it inspects the network traffic much more 131 closely, modifies it and has knowledge about the higher level 132 protocols, which a packet filter lacks. Moreover, proxy-based 133 firewalls often require changes to the programs running on the local 134 clients. Proxy-based firewalls don't need support by the kernel, but 135 they are often combined with a packet filter, which only works if 136 you say Y here. 137 138 You should also say Y here if you intend to use your Linux box as 139 the gateway to the Internet for a local network of machines without 140 globally valid IP addresses. This is called "masquerading": if one 141 of the computers on your local network wants to send something to 142 the outside, your box can "masquerade" as that computer, i.e. it 143 forwards the traffic to the intended outside destination, but 144 modifies the packets to make it look like they came from the 145 firewall box itself. It works both ways: if the outside host 146 replies, the Linux box will silently forward the traffic to the 147 correct local computer. This way, the computers on your local net 148 are completely invisible to the outside world, even though they can 149 reach the outside and can receive replies. It is even possible to 150 run globally visible servers from within a masqueraded local network 151 using a mechanism called portforwarding. Masquerading is also often 152 called NAT (Network Address Translation). 153 154 Another use of Netfilter is in transparent proxying: if a machine on 155 the local network tries to connect to an outside host, your Linux 156 box can transparently forward the traffic to a local server, 157 typically a caching proxy server. 158 159 Yet another use of Netfilter is building a bridging firewall. Using 160 a bridge with Network packet filtering enabled makes iptables "see" 161 the bridged traffic. For filtering on the lower network and Ethernet 162 protocols over the bridge, use ebtables (under bridge netfilter 163 configuration). 164 165 Various modules exist for netfilter which replace the previous 166 masquerading (ipmasqadm), packet filtering (ipchains), transparent 167 proxying, and portforwarding mechanisms. Please see 168 <file:Documentation/Changes> under "iptables" for the location of 169 these packages. 170 171if NETFILTER 172 173config NETFILTER_ADVANCED 174 bool "Advanced netfilter configuration" 175 depends on NETFILTER 176 default y 177 help 178 If you say Y here you can select between all the netfilter modules. 179 If you say N the more unusual ones will not be shown and the 180 basic ones needed by most people will default to 'M'. 181 182 If unsure, say Y. 183 184config BRIDGE_NETFILTER 185 tristate "Bridged IP/ARP packets filtering" 186 depends on BRIDGE 187 depends on NETFILTER && INET 188 depends on NETFILTER_ADVANCED 189 select NETFILTER_FAMILY_BRIDGE 190 select SKB_EXTENSIONS 191 default m 192 ---help--- 193 Enabling this option will let arptables resp. iptables see bridged 194 ARP resp. IP traffic. If you want a bridging firewall, you probably 195 want this option enabled. 196 Enabling or disabling this option doesn't enable or disable 197 ebtables. 198 199 If unsure, say N. 200 201source "net/netfilter/Kconfig" 202source "net/ipv4/netfilter/Kconfig" 203source "net/ipv6/netfilter/Kconfig" 204source "net/decnet/netfilter/Kconfig" 205source "net/bridge/netfilter/Kconfig" 206 207endif 208 209source "net/bpfilter/Kconfig" 210 211source "net/dccp/Kconfig" 212source "net/sctp/Kconfig" 213source "net/rds/Kconfig" 214source "net/tipc/Kconfig" 215source "net/atm/Kconfig" 216source "net/l2tp/Kconfig" 217source "net/802/Kconfig" 218source "net/bridge/Kconfig" 219source "net/dsa/Kconfig" 220source "net/8021q/Kconfig" 221source "net/decnet/Kconfig" 222source "net/llc/Kconfig" 223source "drivers/net/appletalk/Kconfig" 224source "net/x25/Kconfig" 225source "net/lapb/Kconfig" 226source "net/phonet/Kconfig" 227source "net/6lowpan/Kconfig" 228source "net/ieee802154/Kconfig" 229source "net/mac802154/Kconfig" 230source "net/sched/Kconfig" 231source "net/dcb/Kconfig" 232source "net/dns_resolver/Kconfig" 233source "net/batman-adv/Kconfig" 234source "net/openvswitch/Kconfig" 235source "net/vmw_vsock/Kconfig" 236source "net/netlink/Kconfig" 237source "net/mpls/Kconfig" 238source "net/nsh/Kconfig" 239source "net/hsr/Kconfig" 240source "net/switchdev/Kconfig" 241source "net/l3mdev/Kconfig" 242source "net/qrtr/Kconfig" 243source "net/ncsi/Kconfig" 244 245config RPS 246 bool 247 depends on SMP && SYSFS 248 default y 249 250config RFS_ACCEL 251 bool 252 depends on RPS 253 select CPU_RMAP 254 default y 255 256config XPS 257 bool 258 depends on SMP 259 default y 260 261config HWBM 262 bool 263 264config CGROUP_NET_PRIO 265 bool "Network priority cgroup" 266 depends on CGROUPS 267 select SOCK_CGROUP_DATA 268 ---help--- 269 Cgroup subsystem for use in assigning processes to network priorities on 270 a per-interface basis. 271 272config CGROUP_NET_CLASSID 273 bool "Network classid cgroup" 274 depends on CGROUPS 275 select SOCK_CGROUP_DATA 276 ---help--- 277 Cgroup subsystem for use as general purpose socket classid marker that is 278 being used in cls_cgroup and for netfilter matching. 279 280config NET_RX_BUSY_POLL 281 bool 282 default y 283 284config BQL 285 bool 286 depends on SYSFS 287 select DQL 288 default y 289 290config BPF_JIT 291 bool "enable BPF Just In Time compiler" 292 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT 293 depends on MODULES 294 ---help--- 295 Berkeley Packet Filter filtering capabilities are normally handled 296 by an interpreter. This option allows kernel to generate a native 297 code when filter is loaded in memory. This should speedup 298 packet sniffing (libpcap/tcpdump). 299 300 Note, admin should enable this feature changing: 301 /proc/sys/net/core/bpf_jit_enable 302 /proc/sys/net/core/bpf_jit_harden (optional) 303 /proc/sys/net/core/bpf_jit_kallsyms (optional) 304 305config BPF_STREAM_PARSER 306 bool "enable BPF STREAM_PARSER" 307 depends on INET 308 depends on BPF_SYSCALL 309 depends on CGROUP_BPF 310 select STREAM_PARSER 311 select NET_SOCK_MSG 312 ---help--- 313 Enabling this allows a stream parser to be used with 314 BPF_MAP_TYPE_SOCKMAP. 315 316 BPF_MAP_TYPE_SOCKMAP provides a map type to use with network sockets. 317 It can be used to enforce socket policy, implement socket redirects, 318 etc. 319 320config NET_FLOW_LIMIT 321 bool 322 depends on RPS 323 default y 324 ---help--- 325 The network stack has to drop packets when a receive processing CPU's 326 backlog reaches netdev_max_backlog. If a few out of many active flows 327 generate the vast majority of load, drop their traffic earlier to 328 maintain capacity for the other flows. This feature provides servers 329 with many clients some protection against DoS by a single (spoofed) 330 flow that greatly exceeds average workload. 331 332menu "Network testing" 333 334config NET_PKTGEN 335 tristate "Packet Generator (USE WITH CAUTION)" 336 depends on INET && PROC_FS 337 ---help--- 338 This module will inject preconfigured packets, at a configurable 339 rate, out of a given interface. It is used for network interface 340 stress testing and performance analysis. If you don't understand 341 what was just said, you don't need it: say N. 342 343 Documentation on how to use the packet generator can be found 344 at <file:Documentation/networking/pktgen.txt>. 345 346 To compile this code as a module, choose M here: the 347 module will be called pktgen. 348 349config NET_DROP_MONITOR 350 tristate "Network packet drop alerting service" 351 depends on INET && TRACEPOINTS 352 ---help--- 353 This feature provides an alerting service to userspace in the 354 event that packets are discarded in the network stack. Alerts 355 are broadcast via netlink socket to any listening user space 356 process. If you don't need network drop alerts, or if you are ok 357 just checking the various proc files and other utilities for 358 drop statistics, say N here. 359 360endmenu 361 362endmenu 363 364source "net/ax25/Kconfig" 365source "net/can/Kconfig" 366source "net/bluetooth/Kconfig" 367source "net/rxrpc/Kconfig" 368source "net/kcm/Kconfig" 369source "net/strparser/Kconfig" 370 371config FIB_RULES 372 bool 373 374menuconfig WIRELESS 375 bool "Wireless" 376 depends on !S390 377 default y 378 379if WIRELESS 380 381source "net/wireless/Kconfig" 382source "net/mac80211/Kconfig" 383 384endif # WIRELESS 385 386source "net/wimax/Kconfig" 387 388source "net/rfkill/Kconfig" 389source "net/9p/Kconfig" 390source "net/caif/Kconfig" 391source "net/ceph/Kconfig" 392source "net/nfc/Kconfig" 393source "net/psample/Kconfig" 394source "net/ife/Kconfig" 395 396config LWTUNNEL 397 bool "Network light weight tunnels" 398 ---help--- 399 This feature provides an infrastructure to support light weight 400 tunnels like mpls. There is no netdevice associated with a light 401 weight tunnel endpoint. Tunnel encapsulation parameters are stored 402 with light weight tunnel state associated with fib routes. 403 404config LWTUNNEL_BPF 405 bool "Execute BPF program as route nexthop action" 406 depends on LWTUNNEL && INET 407 default y if LWTUNNEL=y 408 ---help--- 409 Allows to run BPF programs as a nexthop action following a route 410 lookup for incoming and outgoing packets. 411 412config DST_CACHE 413 bool 414 default n 415 416config GRO_CELLS 417 bool 418 default n 419 420config SOCK_VALIDATE_XMIT 421 bool 422 423config NET_SOCK_MSG 424 bool 425 default n 426 help 427 The NET_SOCK_MSG provides a framework for plain sockets (e.g. TCP) or 428 ULPs (upper layer modules, e.g. TLS) to process L7 application data 429 with the help of BPF programs. 430 431config NET_DEVLINK 432 bool 433 default n 434 435config PAGE_POOL 436 bool 437 438config FAILOVER 439 tristate "Generic failover module" 440 help 441 The failover module provides a generic interface for paravirtual 442 drivers to register a netdev and a set of ops with a failover 443 instance. The ops are used as event handlers that get called to 444 handle netdev register/unregister/link change/name change events 445 on slave pci ethernet devices with the same mac address as the 446 failover netdev. This enables paravirtual drivers to use a 447 VF as an accelerated low latency datapath. It also allows live 448 migration of VMs with direct attached VFs by failing over to the 449 paravirtual datapath when the VF is unplugged. 450 451endif # if NET 452 453# Used by archs to tell that they support BPF JIT compiler plus which flavour. 454# Only one of the two can be selected for a specific arch since eBPF JIT supersedes 455# the cBPF JIT. 456 457# Classic BPF JIT (cBPF) 458config HAVE_CBPF_JIT 459 bool 460 461# Extended BPF JIT (eBPF) 462config HAVE_EBPF_JIT 463 bool 464