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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 source "net/qrtr/Kconfig"
240 source "net/ncsi/Kconfig"
241 
242 config RPS
243         bool
244         depends on SMP && SYSFS
245         default y
246 
247 config RFS_ACCEL
248         bool
249         depends on RPS
250         select CPU_RMAP
251         default y
252 
253 config XPS
254         bool
255         depends on SMP
256         default y
257 
258 config HWBM
259        bool
260 
261 config CGROUP_NET_PRIO
262         bool "Network priority cgroup"
263         depends on CGROUPS
264         select SOCK_CGROUP_DATA
265         ---help---
266           Cgroup subsystem for use in assigning processes to network priorities on
267           a per-interface basis.
268 
269 config CGROUP_NET_CLASSID
270         bool "Network classid cgroup"
271         depends on CGROUPS
272         select SOCK_CGROUP_DATA
273         ---help---
274           Cgroup subsystem for use as general purpose socket classid marker that is
275           being used in cls_cgroup and for netfilter matching.
276 
277 config NET_RX_BUSY_POLL
278         bool
279         default y
280 
281 config BQL
282         bool
283         depends on SYSFS
284         select DQL
285         default y
286 
287 config BPF_JIT
288         bool "enable BPF Just In Time compiler"
289         depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
290         depends on MODULES
291         ---help---
292           Berkeley Packet Filter filtering capabilities are normally handled
293           by an interpreter. This option allows kernel to generate a native
294           code when filter is loaded in memory. This should speedup
295           packet sniffing (libpcap/tcpdump).
296 
297           Note, admin should enable this feature changing:
298           /proc/sys/net/core/bpf_jit_enable
299           /proc/sys/net/core/bpf_jit_harden (optional)
300 
301 config NET_FLOW_LIMIT
302         bool
303         depends on RPS
304         default y
305         ---help---
306           The network stack has to drop packets when a receive processing CPU's
307           backlog reaches netdev_max_backlog. If a few out of many active flows
308           generate the vast majority of load, drop their traffic earlier to
309           maintain capacity for the other flows. This feature provides servers
310           with many clients some protection against DoS by a single (spoofed)
311           flow that greatly exceeds average workload.
312 
313 menu "Network testing"
314 
315 config NET_PKTGEN
316         tristate "Packet Generator (USE WITH CAUTION)"
317         depends on INET && PROC_FS
318         ---help---
319           This module will inject preconfigured packets, at a configurable
320           rate, out of a given interface.  It is used for network interface
321           stress testing and performance analysis.  If you don't understand
322           what was just said, you don't need it: say N.
323 
324           Documentation on how to use the packet generator can be found
325           at <file:Documentation/networking/pktgen.txt>.
326 
327           To compile this code as a module, choose M here: the
328           module will be called pktgen.
329 
330 config NET_TCPPROBE
331         tristate "TCP connection probing"
332         depends on INET && PROC_FS && KPROBES
333         ---help---
334         This module allows for capturing the changes to TCP connection
335         state in response to incoming packets. It is used for debugging
336         TCP congestion avoidance modules. If you don't understand
337         what was just said, you don't need it: say N.
338 
339         Documentation on how to use TCP connection probing can be found
340         at:
341         
342           http://www.linuxfoundation.org/collaborate/workgroups/networking/tcpprobe
343 
344         To compile this code as a module, choose M here: the
345         module will be called tcp_probe.
346 
347 config NET_DROP_MONITOR
348         tristate "Network packet drop alerting service"
349         depends on INET && TRACEPOINTS
350         ---help---
351         This feature provides an alerting service to userspace in the
352         event that packets are discarded in the network stack.  Alerts
353         are broadcast via netlink socket to any listening user space
354         process.  If you don't need network drop alerts, or if you are ok
355         just checking the various proc files and other utilities for
356         drop statistics, say N here.
357 
358 endmenu
359 
360 endmenu
361 
362 source "net/ax25/Kconfig"
363 source "net/can/Kconfig"
364 source "net/irda/Kconfig"
365 source "net/bluetooth/Kconfig"
366 source "net/rxrpc/Kconfig"
367 source "net/kcm/Kconfig"
368 source "net/strparser/Kconfig"
369 
370 config FIB_RULES
371         bool
372 
373 menuconfig WIRELESS
374         bool "Wireless"
375         depends on !S390
376         default y
377 
378 if WIRELESS
379 
380 source "net/wireless/Kconfig"
381 source "net/mac80211/Kconfig"
382 
383 endif # WIRELESS
384 
385 source "net/wimax/Kconfig"
386 
387 source "net/rfkill/Kconfig"
388 source "net/9p/Kconfig"
389 source "net/caif/Kconfig"
390 source "net/ceph/Kconfig"
391 source "net/nfc/Kconfig"
392 
393 config LWTUNNEL
394         bool "Network light weight tunnels"
395         ---help---
396           This feature provides an infrastructure to support light weight
397           tunnels like mpls. There is no netdevice associated with a light
398           weight tunnel endpoint. Tunnel encapsulation parameters are stored
399           with light weight tunnel state associated with fib routes.
400 
401 config LWTUNNEL_BPF
402         bool "Execute BPF program as route nexthop action"
403         depends on LWTUNNEL
404         default y if LWTUNNEL=y
405         ---help---
406           Allows to run BPF programs as a nexthop action following a route
407           lookup for incoming and outgoing packets.
408 
409 config DST_CACHE
410         bool
411         default n
412 
413 config NET_DEVLINK
414         tristate "Network physical/parent device Netlink interface"
415         help
416           Network physical/parent device Netlink interface provides
417           infrastructure to support access to physical chip-wide config and
418           monitoring.
419 
420 config MAY_USE_DEVLINK
421         tristate
422         default m if NET_DEVLINK=m
423         default y if NET_DEVLINK=y || NET_DEVLINK=n
424         help
425           Drivers using the devlink infrastructure should have a dependency
426           on MAY_USE_DEVLINK to ensure they do not cause link errors when
427           devlink is a loadable module and the driver using it is built-in.
428 
429 endif   # if NET
430 
431 # Used by archs to tell that they support BPF JIT compiler plus which flavour.
432 # Only one of the two can be selected for a specific arch since eBPF JIT supersedes
433 # the cBPF JIT.
434 
435 # Classic BPF JIT (cBPF)
436 config HAVE_CBPF_JIT
437         bool
438 
439 # Extended BPF JIT (eBPF)
440 config HAVE_EBPF_JIT
441         bool

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