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 51menu "Networking options" 52 53source "net/packet/Kconfig" 54source "net/unix/Kconfig" 55source "net/xfrm/Kconfig" 56source "net/iucv/Kconfig" 57 58config 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 82if INET 83source "net/ipv4/Kconfig" 84source "net/ipv6/Kconfig" 85source "net/netlabel/Kconfig" 86 87endif # if INET 88 89config 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 96config NET_PTP_CLASSIFY 97 def_bool n 98 99config 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 109menuconfig 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 162if NETFILTER 163 164config 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 171config 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 182config 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 197source "net/netfilter/Kconfig" 198source "net/ipv4/netfilter/Kconfig" 199source "net/ipv6/netfilter/Kconfig" 200source "net/decnet/netfilter/Kconfig" 201source "net/bridge/netfilter/Kconfig" 202 203endif 204 205source "net/dccp/Kconfig" 206source "net/sctp/Kconfig" 207source "net/rds/Kconfig" 208source "net/tipc/Kconfig" 209source "net/atm/Kconfig" 210source "net/l2tp/Kconfig" 211source "net/802/Kconfig" 212source "net/bridge/Kconfig" 213source "net/dsa/Kconfig" 214source "net/8021q/Kconfig" 215source "net/decnet/Kconfig" 216source "net/llc/Kconfig" 217source "net/ipx/Kconfig" 218source "drivers/net/appletalk/Kconfig" 219source "net/x25/Kconfig" 220source "net/lapb/Kconfig" 221source "net/phonet/Kconfig" 222source "net/6lowpan/Kconfig" 223source "net/ieee802154/Kconfig" 224source "net/mac802154/Kconfig" 225source "net/sched/Kconfig" 226source "net/dcb/Kconfig" 227source "net/dns_resolver/Kconfig" 228source "net/batman-adv/Kconfig" 229source "net/openvswitch/Kconfig" 230source "net/vmw_vsock/Kconfig" 231source "net/netlink/Kconfig" 232source "net/mpls/Kconfig" 233source "net/hsr/Kconfig" 234source "net/switchdev/Kconfig" 235 236config RPS 237 bool 238 depends on SMP && SYSFS 239 default y 240 241config RFS_ACCEL 242 bool 243 depends on RPS 244 select CPU_RMAP 245 default y 246 247config XPS 248 bool 249 depends on SMP 250 default y 251 252config CGROUP_NET_PRIO 253 bool "Network priority cgroup" 254 depends on CGROUPS 255 ---help--- 256 Cgroup subsystem for use in assigning processes to network priorities on 257 a per-interface basis. 258 259config CGROUP_NET_CLASSID 260 bool "Network classid cgroup" 261 depends on CGROUPS 262 ---help--- 263 Cgroup subsystem for use as general purpose socket classid marker that is 264 being used in cls_cgroup and for netfilter matching. 265 266config NET_RX_BUSY_POLL 267 bool 268 default y 269 270config BQL 271 bool 272 depends on SYSFS 273 select DQL 274 default y 275 276config BPF_JIT 277 bool "enable BPF Just In Time compiler" 278 depends on HAVE_BPF_JIT 279 depends on MODULES 280 ---help--- 281 Berkeley Packet Filter filtering capabilities are normally handled 282 by an interpreter. This option allows kernel to generate a native 283 code when filter is loaded in memory. This should speedup 284 packet sniffing (libpcap/tcpdump). Note : Admin should enable 285 this feature changing /proc/sys/net/core/bpf_jit_enable 286 287config NET_FLOW_LIMIT 288 bool 289 depends on RPS 290 default y 291 ---help--- 292 The network stack has to drop packets when a receive processing CPU's 293 backlog reaches netdev_max_backlog. If a few out of many active flows 294 generate the vast majority of load, drop their traffic earlier to 295 maintain capacity for the other flows. This feature provides servers 296 with many clients some protection against DoS by a single (spoofed) 297 flow that greatly exceeds average workload. 298 299menu "Network testing" 300 301config NET_PKTGEN 302 tristate "Packet Generator (USE WITH CAUTION)" 303 depends on INET && PROC_FS 304 ---help--- 305 This module will inject preconfigured packets, at a configurable 306 rate, out of a given interface. It is used for network interface 307 stress testing and performance analysis. If you don't understand 308 what was just said, you don't need it: say N. 309 310 Documentation on how to use the packet generator can be found 311 at <file:Documentation/networking/pktgen.txt>. 312 313 To compile this code as a module, choose M here: the 314 module will be called pktgen. 315 316config NET_TCPPROBE 317 tristate "TCP connection probing" 318 depends on INET && PROC_FS && KPROBES 319 ---help--- 320 This module allows for capturing the changes to TCP connection 321 state in response to incoming packets. It is used for debugging 322 TCP congestion avoidance modules. If you don't understand 323 what was just said, you don't need it: say N. 324 325 Documentation on how to use TCP connection probing can be found 326 at: 327 328 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe 329 330 To compile this code as a module, choose M here: the 331 module will be called tcp_probe. 332 333config NET_DROP_MONITOR 334 tristate "Network packet drop alerting service" 335 depends on INET && TRACEPOINTS 336 ---help--- 337 This feature provides an alerting service to userspace in the 338 event that packets are discarded in the network stack. Alerts 339 are broadcast via netlink socket to any listening user space 340 process. If you don't need network drop alerts, or if you are ok 341 just checking the various proc files and other utilities for 342 drop statistics, say N here. 343 344endmenu 345 346endmenu 347 348source "net/ax25/Kconfig" 349source "net/can/Kconfig" 350source "net/irda/Kconfig" 351source "net/bluetooth/Kconfig" 352source "net/rxrpc/Kconfig" 353 354config FIB_RULES 355 bool 356 357menuconfig WIRELESS 358 bool "Wireless" 359 depends on !S390 360 default y 361 362if WIRELESS 363 364source "net/wireless/Kconfig" 365source "net/mac80211/Kconfig" 366 367endif # WIRELESS 368 369source "net/wimax/Kconfig" 370 371source "net/rfkill/Kconfig" 372source "net/9p/Kconfig" 373source "net/caif/Kconfig" 374source "net/ceph/Kconfig" 375source "net/nfc/Kconfig" 376 377 378endif # if NET 379 380# Used by archs to tell that they support BPF_JIT 381config HAVE_BPF_JIT 382 bool 383