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 48menu "Networking options" 49 50source "net/packet/Kconfig" 51source "net/unix/Kconfig" 52source "net/xfrm/Kconfig" 53source "net/iucv/Kconfig" 54 55config 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 79if INET 80source "net/ipv4/Kconfig" 81source "net/ipv6/Kconfig" 82source "net/netlabel/Kconfig" 83 84endif # if INET 85 86config 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 93config NET_PTP_CLASSIFY 94 def_bool n 95 96config 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 106menuconfig 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 159if NETFILTER 160 161config 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 168config 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 179config 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 194source "net/netfilter/Kconfig" 195source "net/ipv4/netfilter/Kconfig" 196source "net/ipv6/netfilter/Kconfig" 197source "net/decnet/netfilter/Kconfig" 198source "net/bridge/netfilter/Kconfig" 199 200endif 201 202source "net/dccp/Kconfig" 203source "net/sctp/Kconfig" 204source "net/rds/Kconfig" 205source "net/tipc/Kconfig" 206source "net/atm/Kconfig" 207source "net/l2tp/Kconfig" 208source "net/802/Kconfig" 209source "net/bridge/Kconfig" 210source "net/dsa/Kconfig" 211source "net/8021q/Kconfig" 212source "net/decnet/Kconfig" 213source "net/llc/Kconfig" 214source "net/ipx/Kconfig" 215source "drivers/net/appletalk/Kconfig" 216source "net/x25/Kconfig" 217source "net/lapb/Kconfig" 218source "net/phonet/Kconfig" 219source "net/6lowpan/Kconfig" 220source "net/ieee802154/Kconfig" 221source "net/mac802154/Kconfig" 222source "net/sched/Kconfig" 223source "net/dcb/Kconfig" 224source "net/dns_resolver/Kconfig" 225source "net/batman-adv/Kconfig" 226source "net/openvswitch/Kconfig" 227source "net/vmw_vsock/Kconfig" 228source "net/netlink/Kconfig" 229source "net/mpls/Kconfig" 230source "net/hsr/Kconfig" 231source "net/switchdev/Kconfig" 232 233config RPS 234 bool 235 depends on SMP && SYSFS 236 default y 237 238config RFS_ACCEL 239 bool 240 depends on RPS 241 select CPU_RMAP 242 default y 243 244config XPS 245 bool 246 depends on SMP 247 default y 248 249config 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 256config 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 263config NET_RX_BUSY_POLL 264 bool 265 default y 266 267config BQL 268 bool 269 depends on SYSFS 270 select DQL 271 default y 272 273config 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 284config 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 296menu "Network testing" 297 298config 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 313config 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 330config 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 341endmenu 342 343endmenu 344 345source "net/ax25/Kconfig" 346source "net/can/Kconfig" 347source "net/irda/Kconfig" 348source "net/bluetooth/Kconfig" 349source "net/rxrpc/Kconfig" 350 351config FIB_RULES 352 bool 353 354menuconfig WIRELESS 355 bool "Wireless" 356 depends on !S390 357 default y 358 359if WIRELESS 360 361source "net/wireless/Kconfig" 362source "net/mac80211/Kconfig" 363 364endif # WIRELESS 365 366source "net/wimax/Kconfig" 367 368source "net/rfkill/Kconfig" 369source "net/9p/Kconfig" 370source "net/caif/Kconfig" 371source "net/ceph/Kconfig" 372source "net/nfc/Kconfig" 373 374 375endif # if NET 376 377# Used by archs to tell that they support BPF_JIT 378config HAVE_BPF_JIT 379 bool 380