1# 2# Network configuration 3# 4 5menuconfig NET 6 bool "Networking support" 7 select NLATTR 8 ---help--- 9 Unless you really know what you are doing, you should say Y here. 10 The reason is that some programs need kernel networking support even 11 when running on a stand-alone machine that isn't connected to any 12 other computer. 13 14 If you are upgrading from an older kernel, you 15 should consider updating your networking tools too because changes 16 in the kernel and the tools often go hand in hand. The tools are 17 contained in the package net-tools, the location and version number 18 of which are given in <file:Documentation/Changes>. 19 20 For a general introduction to Linux networking, it is highly 21 recommended to read the NET-HOWTO, available from 22 <http://www.tldp.org/docs.html#howto>. 23 24if NET 25 26config WANT_COMPAT_NETLINK_MESSAGES 27 bool 28 help 29 This option can be selected by other options that need compat 30 netlink messages. 31 32config COMPAT_NETLINK_MESSAGES 33 def_bool y 34 depends on COMPAT 35 depends on WEXT_CORE || WANT_COMPAT_NETLINK_MESSAGES 36 help 37 This option makes it possible to send different netlink messages 38 to tasks depending on whether the task is a compat task or not. To 39 achieve this, you need to set skb_shinfo(skb)->frag_list to the 40 compat skb before sending the skb, the netlink code will sort out 41 which message to actually pass to the task. 42 43 Newly written code should NEVER need this option but do 44 compat-independent messages instead! 45 46menu "Networking options" 47 48source "net/packet/Kconfig" 49source "net/unix/Kconfig" 50source "net/xfrm/Kconfig" 51source "net/iucv/Kconfig" 52 53config INET 54 bool "TCP/IP networking" 55 ---help--- 56 These are the protocols used on the Internet and on most local 57 Ethernets. It is highly recommended to say Y here (this will enlarge 58 your kernel by about 400 KB), since some programs (e.g. the X window 59 system) use TCP/IP even if your machine is not connected to any 60 other computer. You will get the so-called loopback device which 61 allows you to ping yourself (great fun, that!). 62 63 For an excellent introduction to Linux networking, please read the 64 Linux Networking HOWTO, available from 65 <http://www.tldp.org/docs.html#howto>. 66 67 If you say Y here and also to "/proc file system support" and 68 "Sysctl support" below, you can change various aspects of the 69 behavior of the TCP/IP code by writing to the (virtual) files in 70 /proc/sys/net/ipv4/*; the options are explained in the file 71 <file:Documentation/networking/ip-sysctl.txt>. 72 73 Short answer: say Y. 74 75if INET 76source "net/ipv4/Kconfig" 77source "net/ipv6/Kconfig" 78source "net/netlabel/Kconfig" 79 80endif # if INET 81 82config NETWORK_SECMARK 83 bool "Security Marking" 84 help 85 This enables security marking of network packets, similar 86 to nfmark, but designated for security purposes. 87 If you are unsure how to answer this question, answer N. 88 89config NETWORK_PHY_TIMESTAMPING 90 bool "Timestamping in PHY devices" 91 depends on EXPERIMENTAL 92 help 93 This allows timestamping of network packets by PHYs with 94 hardware timestamping capabilities. This option adds some 95 overhead in the transmit and receive paths. 96 97 If you are unsure how to answer this question, answer N. 98 99menuconfig NETFILTER 100 bool "Network packet filtering framework (Netfilter)" 101 ---help--- 102 Netfilter is a framework for filtering and mangling network packets 103 that pass through your Linux box. 104 105 The most common use of packet filtering is to run your Linux box as 106 a firewall protecting a local network from the Internet. The type of 107 firewall provided by this kernel support is called a "packet 108 filter", which means that it can reject individual network packets 109 based on type, source, destination etc. The other kind of firewall, 110 a "proxy-based" one, is more secure but more intrusive and more 111 bothersome to set up; it inspects the network traffic much more 112 closely, modifies it and has knowledge about the higher level 113 protocols, which a packet filter lacks. Moreover, proxy-based 114 firewalls often require changes to the programs running on the local 115 clients. Proxy-based firewalls don't need support by the kernel, but 116 they are often combined with a packet filter, which only works if 117 you say Y here. 118 119 You should also say Y here if you intend to use your Linux box as 120 the gateway to the Internet for a local network of machines without 121 globally valid IP addresses. This is called "masquerading": if one 122 of the computers on your local network wants to send something to 123 the outside, your box can "masquerade" as that computer, i.e. it 124 forwards the traffic to the intended outside destination, but 125 modifies the packets to make it look like they came from the 126 firewall box itself. It works both ways: if the outside host 127 replies, the Linux box will silently forward the traffic to the 128 correct local computer. This way, the computers on your local net 129 are completely invisible to the outside world, even though they can 130 reach the outside and can receive replies. It is even possible to 131 run globally visible servers from within a masqueraded local network 132 using a mechanism called portforwarding. Masquerading is also often 133 called NAT (Network Address Translation). 134 135 Another use of Netfilter is in transparent proxying: if a machine on 136 the local network tries to connect to an outside host, your Linux 137 box can transparently forward the traffic to a local server, 138 typically a caching proxy server. 139 140 Yet another use of Netfilter is building a bridging firewall. Using 141 a bridge with Network packet filtering enabled makes iptables "see" 142 the bridged traffic. For filtering on the lower network and Ethernet 143 protocols over the bridge, use ebtables (under bridge netfilter 144 configuration). 145 146 Various modules exist for netfilter which replace the previous 147 masquerading (ipmasqadm), packet filtering (ipchains), transparent 148 proxying, and portforwarding mechanisms. Please see 149 <file:Documentation/Changes> under "iptables" for the location of 150 these packages. 151 152if NETFILTER 153 154config NETFILTER_DEBUG 155 bool "Network packet filtering debugging" 156 depends on NETFILTER 157 help 158 You can say Y here if you want to get additional messages useful in 159 debugging the netfilter code. 160 161config NETFILTER_ADVANCED 162 bool "Advanced netfilter configuration" 163 depends on NETFILTER 164 default y 165 help 166 If you say Y here you can select between all the netfilter modules. 167 If you say N the more unusual ones will not be shown and the 168 basic ones needed by most people will default to 'M'. 169 170 If unsure, say Y. 171 172config BRIDGE_NETFILTER 173 bool "Bridged IP/ARP packets filtering" 174 depends on BRIDGE && NETFILTER && INET 175 depends on NETFILTER_ADVANCED 176 default y 177 ---help--- 178 Enabling this option will let arptables resp. iptables see bridged 179 ARP resp. IP traffic. If you want a bridging firewall, you probably 180 want this option enabled. 181 Enabling or disabling this option doesn't enable or disable 182 ebtables. 183 184 If unsure, say N. 185 186source "net/netfilter/Kconfig" 187source "net/ipv4/netfilter/Kconfig" 188source "net/ipv6/netfilter/Kconfig" 189source "net/decnet/netfilter/Kconfig" 190source "net/bridge/netfilter/Kconfig" 191 192endif 193 194source "net/dccp/Kconfig" 195source "net/sctp/Kconfig" 196source "net/rds/Kconfig" 197source "net/tipc/Kconfig" 198source "net/atm/Kconfig" 199source "net/l2tp/Kconfig" 200source "net/802/Kconfig" 201source "net/bridge/Kconfig" 202source "net/dsa/Kconfig" 203source "net/8021q/Kconfig" 204source "net/decnet/Kconfig" 205source "net/llc/Kconfig" 206source "net/ipx/Kconfig" 207source "drivers/net/appletalk/Kconfig" 208source "net/x25/Kconfig" 209source "net/lapb/Kconfig" 210source "net/econet/Kconfig" 211source "net/wanrouter/Kconfig" 212source "net/phonet/Kconfig" 213source "net/ieee802154/Kconfig" 214source "net/sched/Kconfig" 215source "net/dcb/Kconfig" 216source "net/dns_resolver/Kconfig" 217 218config RPS 219 boolean 220 depends on SMP && SYSFS 221 default y 222 223menu "Network testing" 224 225config NET_PKTGEN 226 tristate "Packet Generator (USE WITH CAUTION)" 227 depends on PROC_FS 228 ---help--- 229 This module will inject preconfigured packets, at a configurable 230 rate, out of a given interface. It is used for network interface 231 stress testing and performance analysis. If you don't understand 232 what was just said, you don't need it: say N. 233 234 Documentation on how to use the packet generator can be found 235 at <file:Documentation/networking/pktgen.txt>. 236 237 To compile this code as a module, choose M here: the 238 module will be called pktgen. 239 240config NET_TCPPROBE 241 tristate "TCP connection probing" 242 depends on INET && EXPERIMENTAL && PROC_FS && KPROBES 243 ---help--- 244 This module allows for capturing the changes to TCP connection 245 state in response to incoming packets. It is used for debugging 246 TCP congestion avoidance modules. If you don't understand 247 what was just said, you don't need it: say N. 248 249 Documentation on how to use TCP connection probing can be found 250 at http://linux-net.osdl.org/index.php/TcpProbe 251 252 To compile this code as a module, choose M here: the 253 module will be called tcp_probe. 254 255config NET_DROP_MONITOR 256 boolean "Network packet drop alerting service" 257 depends on INET && EXPERIMENTAL && TRACEPOINTS 258 ---help--- 259 This feature provides an alerting service to userspace in the 260 event that packets are discarded in the network stack. Alerts 261 are broadcast via netlink socket to any listening user space 262 process. If you don't need network drop alerts, or if you are ok 263 just checking the various proc files and other utilities for 264 drop statistics, say N here. 265 266endmenu 267 268endmenu 269 270source "net/ax25/Kconfig" 271source "net/can/Kconfig" 272source "net/irda/Kconfig" 273source "net/bluetooth/Kconfig" 274source "net/rxrpc/Kconfig" 275 276config FIB_RULES 277 bool 278 279menuconfig WIRELESS 280 bool "Wireless" 281 depends on !S390 282 default y 283 284if WIRELESS 285 286source "net/wireless/Kconfig" 287source "net/mac80211/Kconfig" 288 289endif # WIRELESS 290 291source "net/wimax/Kconfig" 292 293source "net/rfkill/Kconfig" 294source "net/9p/Kconfig" 295source "net/caif/Kconfig" 296 297 298endif # if NET 299