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" 231 232config RPS 233 boolean 234 depends on SMP && SYSFS 235 default y 236 237config RFS_ACCEL 238 boolean 239 depends on RPS 240 select CPU_RMAP 241 default y 242 243config XPS 244 boolean 245 depends on SMP 246 default y 247 248config CGROUP_NET_PRIO 249 bool "Network priority cgroup" 250 depends on CGROUPS 251 ---help--- 252 Cgroup subsystem for use in assigning processes to network priorities on 253 a per-interface basis. 254 255config CGROUP_NET_CLASSID 256 boolean "Network classid cgroup" 257 depends on CGROUPS 258 ---help--- 259 Cgroup subsystem for use as general purpose socket classid marker that is 260 being used in cls_cgroup and for netfilter matching. 261 262config NET_RX_BUSY_POLL 263 boolean 264 default y 265 266config BQL 267 boolean 268 depends on SYSFS 269 select DQL 270 default y 271 272config BPF_JIT 273 bool "enable BPF Just In Time compiler" 274 depends on HAVE_BPF_JIT 275 depends on MODULES 276 ---help--- 277 Berkeley Packet Filter filtering capabilities are normally handled 278 by an interpreter. This option allows kernel to generate a native 279 code when filter is loaded in memory. This should speedup 280 packet sniffing (libpcap/tcpdump). Note : Admin should enable 281 this feature changing /proc/sys/net/core/bpf_jit_enable 282 283config NET_FLOW_LIMIT 284 boolean 285 depends on RPS 286 default y 287 ---help--- 288 The network stack has to drop packets when a receive processing CPU's 289 backlog reaches netdev_max_backlog. If a few out of many active flows 290 generate the vast majority of load, drop their traffic earlier to 291 maintain capacity for the other flows. This feature provides servers 292 with many clients some protection against DoS by a single (spoofed) 293 flow that greatly exceeds average workload. 294 295menu "Network testing" 296 297config NET_PKTGEN 298 tristate "Packet Generator (USE WITH CAUTION)" 299 depends on INET && PROC_FS 300 ---help--- 301 This module will inject preconfigured packets, at a configurable 302 rate, out of a given interface. It is used for network interface 303 stress testing and performance analysis. If you don't understand 304 what was just said, you don't need it: say N. 305 306 Documentation on how to use the packet generator can be found 307 at <file:Documentation/networking/pktgen.txt>. 308 309 To compile this code as a module, choose M here: the 310 module will be called pktgen. 311 312config NET_TCPPROBE 313 tristate "TCP connection probing" 314 depends on INET && PROC_FS && KPROBES 315 ---help--- 316 This module allows for capturing the changes to TCP connection 317 state in response to incoming packets. It is used for debugging 318 TCP congestion avoidance modules. If you don't understand 319 what was just said, you don't need it: say N. 320 321 Documentation on how to use TCP connection probing can be found 322 at: 323 324 http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe 325 326 To compile this code as a module, choose M here: the 327 module will be called tcp_probe. 328 329config NET_DROP_MONITOR 330 tristate "Network packet drop alerting service" 331 depends on INET && TRACEPOINTS 332 ---help--- 333 This feature provides an alerting service to userspace in the 334 event that packets are discarded in the network stack. Alerts 335 are broadcast via netlink socket to any listening user space 336 process. If you don't need network drop alerts, or if you are ok 337 just checking the various proc files and other utilities for 338 drop statistics, say N here. 339 340endmenu 341 342endmenu 343 344source "net/ax25/Kconfig" 345source "net/can/Kconfig" 346source "net/irda/Kconfig" 347source "net/bluetooth/Kconfig" 348source "net/rxrpc/Kconfig" 349 350config FIB_RULES 351 bool 352 353menuconfig WIRELESS 354 bool "Wireless" 355 depends on !S390 356 default y 357 358if WIRELESS 359 360source "net/wireless/Kconfig" 361source "net/mac80211/Kconfig" 362 363endif # WIRELESS 364 365source "net/wimax/Kconfig" 366 367source "net/rfkill/Kconfig" 368source "net/9p/Kconfig" 369source "net/caif/Kconfig" 370source "net/ceph/Kconfig" 371source "net/nfc/Kconfig" 372 373 374endif # if NET 375 376# Used by archs to tell that they support BPF_JIT 377config HAVE_BPF_JIT 378 bool 379