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

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