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Linux/net/Kconfig

  1 #
  2 # Network configuration
  3 #
  4 
  5 menuconfig 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 
 26 if NET
 27 
 28 config WANT_COMPAT_NETLINK_MESSAGES
 29         bool
 30         help
 31           This option can be selected by other options that need compat
 32           netlink messages.
 33 
 34 config 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 
 48 config NET_INGRESS
 49         bool
 50 
 51 config NET_EGRESS
 52         bool
 53 
 54 menu "Networking options"
 55 
 56 source "net/packet/Kconfig"
 57 source "net/unix/Kconfig"
 58 source "net/xfrm/Kconfig"
 59 source "net/iucv/Kconfig"
 60 
 61 config INET
 62         bool "TCP/IP networking"
 63         select CRYPTO
 64         select CRYPTO_AES
 65         ---help---
 66           These are the protocols used on the Internet and on most local
 67           Ethernets. It is highly recommended to say Y here (this will enlarge
 68           your kernel by about 400 KB), since some programs (e.g. the X window
 69           system) use TCP/IP even if your machine is not connected to any
 70           other computer. You will get the so-called loopback device which
 71           allows you to ping yourself (great fun, that!).
 72 
 73           For an excellent introduction to Linux networking, please read the
 74           Linux Networking HOWTO, available from
 75           <http://www.tldp.org/docs.html#howto>.
 76 
 77           If you say Y here and also to "/proc file system support" and
 78           "Sysctl support" below, you can change various aspects of the
 79           behavior of the TCP/IP code by writing to the (virtual) files in
 80           /proc/sys/net/ipv4/*; the options are explained in the file
 81           <file:Documentation/networking/ip-sysctl.txt>.
 82 
 83           Short answer: say Y.
 84 
 85 if INET
 86 source "net/ipv4/Kconfig"
 87 source "net/ipv6/Kconfig"
 88 source "net/netlabel/Kconfig"
 89 
 90 endif # if INET
 91 
 92 config NETWORK_SECMARK
 93         bool "Security Marking"
 94         help
 95           This enables security marking of network packets, similar
 96           to nfmark, but designated for security purposes.
 97           If you are unsure how to answer this question, answer N.
 98 
 99 config NET_PTP_CLASSIFY
100         def_bool n
101 
102 config NETWORK_PHY_TIMESTAMPING
103         bool "Timestamping in PHY devices"
104         select NET_PTP_CLASSIFY
105         help
106           This allows timestamping of network packets by PHYs with
107           hardware timestamping capabilities. This option adds some
108           overhead in the transmit and receive paths.
109 
110           If you are unsure how to answer this question, answer N.
111 
112 menuconfig NETFILTER
113         bool "Network packet filtering framework (Netfilter)"
114         ---help---
115           Netfilter is a framework for filtering and mangling network packets
116           that pass through your Linux box.
117 
118           The most common use of packet filtering is to run your Linux box as
119           a firewall protecting a local network from the Internet. The type of
120           firewall provided by this kernel support is called a "packet
121           filter", which means that it can reject individual network packets
122           based on type, source, destination etc. The other kind of firewall,
123           a "proxy-based" one, is more secure but more intrusive and more
124           bothersome to set up; it inspects the network traffic much more
125           closely, modifies it and has knowledge about the higher level
126           protocols, which a packet filter lacks. Moreover, proxy-based
127           firewalls often require changes to the programs running on the local
128           clients. Proxy-based firewalls don't need support by the kernel, but
129           they are often combined with a packet filter, which only works if
130           you say Y here.
131 
132           You should also say Y here if you intend to use your Linux box as
133           the gateway to the Internet for a local network of machines without
134           globally valid IP addresses. This is called "masquerading": if one
135           of the computers on your local network wants to send something to
136           the outside, your box can "masquerade" as that computer, i.e. it
137           forwards the traffic to the intended outside destination, but
138           modifies the packets to make it look like they came from the
139           firewall box itself. It works both ways: if the outside host
140           replies, the Linux box will silently forward the traffic to the
141           correct local computer. This way, the computers on your local net
142           are completely invisible to the outside world, even though they can
143           reach the outside and can receive replies. It is even possible to
144           run globally visible servers from within a masqueraded local network
145           using a mechanism called portforwarding. Masquerading is also often
146           called NAT (Network Address Translation).
147 
148           Another use of Netfilter is in transparent proxying: if a machine on
149           the local network tries to connect to an outside host, your Linux
150           box can transparently forward the traffic to a local server,
151           typically a caching proxy server.
152 
153           Yet another use of Netfilter is building a bridging firewall. Using
154           a bridge with Network packet filtering enabled makes iptables "see"
155           the bridged traffic. For filtering on the lower network and Ethernet
156           protocols over the bridge, use ebtables (under bridge netfilter
157           configuration).
158 
159           Various modules exist for netfilter which replace the previous
160           masquerading (ipmasqadm), packet filtering (ipchains), transparent
161           proxying, and portforwarding mechanisms. Please see
162           <file:Documentation/Changes> under "iptables" for the location of
163           these packages.
164 
165 if NETFILTER
166 
167 config NETFILTER_DEBUG
168         bool "Network packet filtering debugging"
169         depends on NETFILTER
170         help
171           You can say Y here if you want to get additional messages useful in
172           debugging the netfilter code.
173 
174 config NETFILTER_ADVANCED
175         bool "Advanced netfilter configuration"
176         depends on NETFILTER
177         default y
178         help
179           If you say Y here you can select between all the netfilter modules.
180           If you say N the more unusual ones will not be shown and the
181           basic ones needed by most people will default to 'M'.
182 
183           If unsure, say Y.
184 
185 config BRIDGE_NETFILTER
186         tristate "Bridged IP/ARP packets filtering"
187         depends on BRIDGE
188         depends on NETFILTER && INET
189         depends on NETFILTER_ADVANCED
190         default m
191         ---help---
192           Enabling this option will let arptables resp. iptables see bridged
193           ARP resp. IP traffic. If you want a bridging firewall, you probably
194           want this option enabled.
195           Enabling or disabling this option doesn't enable or disable
196           ebtables.
197 
198           If unsure, say N.
199 
200 source "net/netfilter/Kconfig"
201 source "net/ipv4/netfilter/Kconfig"
202 source "net/ipv6/netfilter/Kconfig"
203 source "net/decnet/netfilter/Kconfig"
204 source "net/bridge/netfilter/Kconfig"
205 
206 endif
207 
208 source "net/dccp/Kconfig"
209 source "net/sctp/Kconfig"
210 source "net/rds/Kconfig"
211 source "net/tipc/Kconfig"
212 source "net/atm/Kconfig"
213 source "net/l2tp/Kconfig"
214 source "net/802/Kconfig"
215 source "net/bridge/Kconfig"
216 source "net/dsa/Kconfig"
217 source "net/8021q/Kconfig"
218 source "net/decnet/Kconfig"
219 source "net/llc/Kconfig"
220 source "net/ipx/Kconfig"
221 source "drivers/net/appletalk/Kconfig"
222 source "net/x25/Kconfig"
223 source "net/lapb/Kconfig"
224 source "net/phonet/Kconfig"
225 source "net/6lowpan/Kconfig"
226 source "net/ieee802154/Kconfig"
227 source "net/mac802154/Kconfig"
228 source "net/sched/Kconfig"
229 source "net/dcb/Kconfig"
230 source "net/dns_resolver/Kconfig"
231 source "net/batman-adv/Kconfig"
232 source "net/openvswitch/Kconfig"
233 source "net/vmw_vsock/Kconfig"
234 source "net/netlink/Kconfig"
235 source "net/mpls/Kconfig"
236 source "net/hsr/Kconfig"
237 source "net/switchdev/Kconfig"
238 source "net/l3mdev/Kconfig"
239 
240 config RPS
241         bool
242         depends on SMP && SYSFS
243         default y
244 
245 config RFS_ACCEL
246         bool
247         depends on RPS
248         select CPU_RMAP
249         default y
250 
251 config XPS
252         bool
253         depends on SMP
254         default y
255 
256 config SOCK_CGROUP_DATA
257         bool
258         default n
259 
260 config CGROUP_NET_PRIO
261         bool "Network priority cgroup"
262         depends on CGROUPS
263         select SOCK_CGROUP_DATA
264         ---help---
265           Cgroup subsystem for use in assigning processes to network priorities on
266           a per-interface basis.
267 
268 config CGROUP_NET_CLASSID
269         bool "Network classid cgroup"
270         depends on CGROUPS
271         select SOCK_CGROUP_DATA
272         ---help---
273           Cgroup subsystem for use as general purpose socket classid marker that is
274           being used in cls_cgroup and for netfilter matching.
275 
276 config NET_RX_BUSY_POLL
277         bool
278         default y
279 
280 config BQL
281         bool
282         depends on SYSFS
283         select DQL
284         default y
285 
286 config BPF_JIT
287         bool "enable BPF Just In Time compiler"
288         depends on HAVE_BPF_JIT
289         depends on MODULES
290         ---help---
291           Berkeley Packet Filter filtering capabilities are normally handled
292           by an interpreter. This option allows kernel to generate a native
293           code when filter is loaded in memory. This should speedup
294           packet sniffing (libpcap/tcpdump). Note : Admin should enable
295           this feature changing /proc/sys/net/core/bpf_jit_enable
296 
297 config NET_FLOW_LIMIT
298         bool
299         depends on RPS
300         default y
301         ---help---
302           The network stack has to drop packets when a receive processing CPU's
303           backlog reaches netdev_max_backlog. If a few out of many active flows
304           generate the vast majority of load, drop their traffic earlier to
305           maintain capacity for the other flows. This feature provides servers
306           with many clients some protection against DoS by a single (spoofed)
307           flow that greatly exceeds average workload.
308 
309 menu "Network testing"
310 
311 config NET_PKTGEN
312         tristate "Packet Generator (USE WITH CAUTION)"
313         depends on INET && PROC_FS
314         ---help---
315           This module will inject preconfigured packets, at a configurable
316           rate, out of a given interface.  It is used for network interface
317           stress testing and performance analysis.  If you don't understand
318           what was just said, you don't need it: say N.
319 
320           Documentation on how to use the packet generator can be found
321           at <file:Documentation/networking/pktgen.txt>.
322 
323           To compile this code as a module, choose M here: the
324           module will be called pktgen.
325 
326 config NET_TCPPROBE
327         tristate "TCP connection probing"
328         depends on INET && PROC_FS && KPROBES
329         ---help---
330         This module allows for capturing the changes to TCP connection
331         state in response to incoming packets. It is used for debugging
332         TCP congestion avoidance modules. If you don't understand
333         what was just said, you don't need it: say N.
334 
335         Documentation on how to use TCP connection probing can be found
336         at:
337         
338           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
339 
340         To compile this code as a module, choose M here: the
341         module will be called tcp_probe.
342 
343 config NET_DROP_MONITOR
344         tristate "Network packet drop alerting service"
345         depends on INET && TRACEPOINTS
346         ---help---
347         This feature provides an alerting service to userspace in the
348         event that packets are discarded in the network stack.  Alerts
349         are broadcast via netlink socket to any listening user space
350         process.  If you don't need network drop alerts, or if you are ok
351         just checking the various proc files and other utilities for
352         drop statistics, say N here.
353 
354 endmenu
355 
356 endmenu
357 
358 source "net/ax25/Kconfig"
359 source "net/can/Kconfig"
360 source "net/irda/Kconfig"
361 source "net/bluetooth/Kconfig"
362 source "net/rxrpc/Kconfig"
363 
364 config FIB_RULES
365         bool
366 
367 menuconfig WIRELESS
368         bool "Wireless"
369         depends on !S390
370         default y
371 
372 if WIRELESS
373 
374 source "net/wireless/Kconfig"
375 source "net/mac80211/Kconfig"
376 
377 endif # WIRELESS
378 
379 source "net/wimax/Kconfig"
380 
381 source "net/rfkill/Kconfig"
382 source "net/9p/Kconfig"
383 source "net/caif/Kconfig"
384 source "net/ceph/Kconfig"
385 source "net/nfc/Kconfig"
386 
387 config LWTUNNEL
388         bool "Network light weight tunnels"
389         ---help---
390           This feature provides an infrastructure to support light weight
391           tunnels like mpls. There is no netdevice associated with a light
392           weight tunnel endpoint. Tunnel encapsulation parameters are stored
393           with light weight tunnel state associated with fib routes.
394 
395 endif   # if NET
396 
397 # Used by archs to tell that they support BPF_JIT
398 config HAVE_BPF_JIT
399         bool

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