1# 2# Network configuration 3# 4 5menuconfig 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 25if NET 26 27config WANT_COMPAT_NETLINK_MESSAGES 28 bool 29 help 30 This option can be selected by other options that need compat 31 netlink messages. 32 33config 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 47menu "Networking options" 48 49source "net/packet/Kconfig" 50source "net/unix/Kconfig" 51source "net/xfrm/Kconfig" 52source "net/iucv/Kconfig" 53 54config 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 78if INET 79source "net/ipv4/Kconfig" 80source "net/ipv6/Kconfig" 81source "net/netlabel/Kconfig" 82 83endif # if INET 84 85config 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 92config NET_PTP_CLASSIFY 93 def_bool n 94 95config NETWORK_PHY_TIMESTAMPING 96 bool "Timestamping in PHY devices" 97 select NET_PTP_CLASSIFY 98 help 99 This allows timestamping of network packets by PHYs with 100 hardware timestamping capabilities. This option adds some 101 overhead in the transmit and receive paths. 102 103 If you are unsure how to answer this question, answer N. 104 105menuconfig NETFILTER 106 bool "Network packet filtering framework (Netfilter)" 107 ---help--- 108 Netfilter is a framework for filtering and mangling network packets 109 that pass through your Linux box. 110 111 The most common use of packet filtering is to run your Linux box as 112 a firewall protecting a local network from the Internet. The type of 113 firewall provided by this kernel support is called a "packet 114 filter", which means that it can reject individual network packets 115 based on type, source, destination etc. The other kind of firewall, 116 a "proxy-based" one, is more secure but more intrusive and more 117 bothersome to set up; it inspects the network traffic much more 118 closely, modifies it and has knowledge about the higher level 119 protocols, which a packet filter lacks. Moreover, proxy-based 120 firewalls often require changes to the programs running on the local 121 clients. Proxy-based firewalls don't need support by the kernel, but 122 they are often combined with a packet filter, which only works if 123 you say Y here. 124 125 You should also say Y here if you intend to use your Linux box as 126 the gateway to the Internet for a local network of machines without 127 globally valid IP addresses. This is called "masquerading": if one 128 of the computers on your local network wants to send something to 129 the outside, your box can "masquerade" as that computer, i.e. it 130 forwards the traffic to the intended outside destination, but 131 modifies the packets to make it look like they came from the 132 firewall box itself. It works both ways: if the outside host 133 replies, the Linux box will silently forward the traffic to the 134 correct local computer. This way, the computers on your local net 135 are completely invisible to the outside world, even though they can 136 reach the outside and can receive replies. It is even possible to 137 run globally visible servers from within a masqueraded local network 138 using a mechanism called portforwarding. Masquerading is also often 139 called NAT (Network Address Translation). 140 141 Another use of Netfilter is in transparent proxying: if a machine on 142 the local network tries to connect to an outside host, your Linux 143 box can transparently forward the traffic to a local server, 144 typically a caching proxy server. 145 146 Yet another use of Netfilter is building a bridging firewall. Using 147 a bridge with Network packet filtering enabled makes iptables "see" 148 the bridged traffic. For filtering on the lower network and Ethernet 149 protocols over the bridge, use ebtables (under bridge netfilter 150 configuration). 151 152 Various modules exist for netfilter which replace the previous 153 masquerading (ipmasqadm), packet filtering (ipchains), transparent 154 proxying, and portforwarding mechanisms. Please see 155 <file:Documentation/Changes> under "iptables" for the location of 156 these packages. 157 158if NETFILTER 159 160config NETFILTER_DEBUG 161 bool "Network packet filtering debugging" 162 depends on NETFILTER 163 help 164 You can say Y here if you want to get additional messages useful in 165 debugging the netfilter code. 166 167config NETFILTER_ADVANCED 168 bool "Advanced netfilter configuration" 169 depends on NETFILTER 170 default y 171 help 172 If you say Y here you can select between all the netfilter modules. 173 If you say N the more unusual ones will not be shown and the 174 basic ones needed by most people will default to 'M'. 175 176 If unsure, say Y. 177 178config BRIDGE_NETFILTER 179 tristate "Bridged IP/ARP packets filtering" 180 depends on BRIDGE 181 depends on NETFILTER && INET 182 depends on NETFILTER_ADVANCED 183 default m 184 ---help--- 185 Enabling this option will let arptables resp. iptables see bridged 186 ARP resp. IP traffic. If you want a bridging firewall, you probably 187 want this option enabled. 188 Enabling or disabling this option doesn't enable or disable 189 ebtables. 190 191 If unsure, say N. 192 193source "net/netfilter/Kconfig" 194source "net/ipv4/netfilter/Kconfig" 195source "net/ipv6/netfilter/Kconfig" 196source "net/decnet/netfilter/Kconfig" 197source "net/bridge/netfilter/Kconfig" 198 199endif 200 201source "net/dccp/Kconfig" 202source "net/sctp/Kconfig" 203source "net/rds/Kconfig" 204source "net/tipc/Kconfig" 205source "net/atm/Kconfig" 206source "net/l2tp/Kconfig" 207source "net/802/Kconfig" 208source "net/bridge/Kconfig" 209source "net/dsa/Kconfig" 210source "net/8021q/Kconfig" 211source "net/decnet/Kconfig" 212source "net/llc/Kconfig" 213source "net/ipx/Kconfig" 214source "drivers/net/appletalk/Kconfig" 215source "net/x25/Kconfig" 216source "net/lapb/Kconfig" 217source "net/phonet/Kconfig" 218source "net/6lowpan/Kconfig" 219source "net/ieee802154/Kconfig" 220source "net/mac802154/Kconfig" 221source "net/sched/Kconfig" 222source "net/dcb/Kconfig" 223source "net/dns_resolver/Kconfig" 224source "net/batman-adv/Kconfig" 225source "net/openvswitch/Kconfig" 226source "net/vmw_vsock/Kconfig" 227source "net/netlink/Kconfig" 228source "net/mpls/Kconfig" 229source "net/hsr/Kconfig" 230 231config RPS 232 boolean 233 depends on SMP && SYSFS 234 default y 235 236config RFS_ACCEL 237 boolean 238 depends on RPS 239 select CPU_RMAP 240 default y 241 242config XPS 243 boolean 244 depends on SMP 245 default y 246 247config CGROUP_NET_PRIO 248 bool "Network priority cgroup" 249 depends on CGROUPS 250 ---help--- 251 Cgroup subsystem for use in assigning processes to network priorities on 252 a per-interface basis. 253 254config CGROUP_NET_CLASSID 255 boolean "Network classid cgroup" 256 depends on CGROUPS 257 ---help--- 258 Cgroup subsystem for use as general purpose socket classid marker that is 259 being used in cls_cgroup and for netfilter matching. 260 261config NET_RX_BUSY_POLL 262 boolean 263 default y 264 265config BQL 266 boolean 267 depends on SYSFS 268 select DQL 269 default y 270 271config BPF_JIT 272 bool "enable BPF Just In Time compiler" 273 depends on HAVE_BPF_JIT 274 depends on MODULES 275 ---help--- 276 Berkeley Packet Filter filtering capabilities are normally handled 277 by an interpreter. This option allows kernel to generate a native 278 code when filter is loaded in memory. This should speedup 279 packet sniffing (libpcap/tcpdump). Note : Admin should enable 280 this feature changing /proc/sys/net/core/bpf_jit_enable 281 282config NET_FLOW_LIMIT 283 boolean 284 depends on RPS 285 default y 286 ---help--- 287 The network stack has to drop packets when a receive processing CPU's 288 backlog reaches netdev_max_backlog. If a few out of many active flows 289 generate the vast majority of load, drop their traffic earlier to 290 maintain capacity for the other flows. This feature provides servers 291 with many clients some protection against DoS by a single (spoofed) 292 flow that greatly exceeds average workload. 293 294menu "Network testing" 295 296config NET_PKTGEN 297 tristate "Packet Generator (USE WITH CAUTION)" 298 depends on INET && PROC_FS 299 ---help--- 300 This module will inject preconfigured packets, at a configurable 301 rate, out of a given interface. It is used for network interface 302 stress testing and performance analysis. If you don't understand 303 what was just said, you don't need it: say N. 304 305 Documentation on how to use the packet generator can be found 306 at <file:Documentation/networking/pktgen.txt>. 307 308 To compile this code as a module, choose M here: the 309 module will be called pktgen. 310 311config NET_TCPPROBE 312 tristate "TCP connection probing" 313 depends on INET && PROC_FS && KPROBES 314 ---help--- 315 This module allows for capturing the changes to TCP connection 316 state in response to incoming packets. It is used for debugging 317 TCP congestion avoidance modules. If you don't understand 318 what was just said, you don't need it: say N. 319 320 Documentation on how to use TCP connection probing can be found 321 at: 322 323 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe 324 325 To compile this code as a module, choose M here: the 326 module will be called tcp_probe. 327 328config NET_DROP_MONITOR 329 tristate "Network packet drop alerting service" 330 depends on INET && TRACEPOINTS 331 ---help--- 332 This feature provides an alerting service to userspace in the 333 event that packets are discarded in the network stack. Alerts 334 are broadcast via netlink socket to any listening user space 335 process. If you don't need network drop alerts, or if you are ok 336 just checking the various proc files and other utilities for 337 drop statistics, say N here. 338 339endmenu 340 341endmenu 342 343source "net/ax25/Kconfig" 344source "net/can/Kconfig" 345source "net/irda/Kconfig" 346source "net/bluetooth/Kconfig" 347source "net/rxrpc/Kconfig" 348 349config FIB_RULES 350 bool 351 352menuconfig WIRELESS 353 bool "Wireless" 354 depends on !S390 355 default y 356 357if WIRELESS 358 359source "net/wireless/Kconfig" 360source "net/mac80211/Kconfig" 361 362endif # WIRELESS 363 364source "net/wimax/Kconfig" 365 366source "net/rfkill/Kconfig" 367source "net/9p/Kconfig" 368source "net/caif/Kconfig" 369source "net/ceph/Kconfig" 370source "net/nfc/Kconfig" 371 372 373endif # if NET 374 375# Used by archs to tell that they support BPF_JIT 376config HAVE_BPF_JIT 377 bool 378