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

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