2 # IP netfilter configuration
5 menu "IP: Netfilter Configuration"
6 depends on INET && NETFILTER
12 config NF_CONNTRACK_IPV4
13 tristate "IPv4 connection tracking support (required for NAT)"
14 depends on NF_CONNTRACK
15 default m if NETFILTER_ADVANCED=n
18 Connection tracking keeps a record of what packets have passed
19 through your machine, in order to figure out how they are related
22 This is IPv4 support on Layer 3 independent connection tracking.
23 Layer 3 independent connection tracking is experimental scheme
24 which generalize ip_conntrack to support other layer 3 protocols.
26 To compile it as a module, choose M here. If unsure, say N.
29 tristate "IPv4 socket lookup support"
31 This option enables the IPv4 socket lookup infrastructure. This is
32 is required by the iptables socket match.
37 tristate "IPv4 nf_tables support"
39 This option enables the IPv4 support for nf_tables.
43 config NFT_CHAIN_ROUTE_IPV4
44 tristate "IPv4 nf_tables route chain support"
46 This option enables the "route" chain for IPv4 in nf_tables. This
47 chain type is used to force packet re-routing after mangling header
48 fields such as the source, destination, type of service and
51 config NFT_REJECT_IPV4
57 tristate "IPv4 nf_tables packet duplication support"
58 depends on !NF_CONNTRACK || NF_CONNTRACK
61 This module enables IPv4 packet duplication support for nf_tables.
65 tristate "nf_tables fib / ip route lookup support"
67 This module enables IPv4 FIB lookups, e.g. for reverse path filtering.
68 It also allows query of the FIB for the route type, e.g. local, unicast,
69 multicast or blackhole.
71 endif # NF_TABLES_IPV4
74 tristate "ARP nf_tables support"
76 This option enables the ARP support for nf_tables.
81 tristate "Netfilter IPv4 packet duplication to alternate destination"
82 depends on !NF_CONNTRACK || NF_CONNTRACK
84 This option enables the nf_dup_ipv4 core, which duplicates an IPv4
85 packet to be rerouted to another destination.
88 tristate "ARP packet logging"
89 default m if NETFILTER_ADVANCED=n
93 tristate "IPv4 packet logging"
94 default m if NETFILTER_ADVANCED=n
98 tristate "IPv4 packet rejection"
99 default m if NETFILTER_ADVANCED=n
103 depends on NF_CONNTRACK_IPV4
104 default m if NETFILTER_ADVANCED=n
107 The IPv4 NAT option allows masquerading, port forwarding and other
108 forms of full Network Address Port Translation. This can be
109 controlled by iptables or nft.
113 config NFT_CHAIN_NAT_IPV4
114 depends on NF_TABLES_IPV4
115 tristate "IPv4 nf_tables nat chain support"
117 This option enables the "nat" chain for IPv4 in nf_tables. This
118 chain type is used to perform Network Address Translation (NAT)
119 packet transformations such as the source, destination address and
120 source and destination ports.
122 config NF_NAT_MASQUERADE_IPV4
123 tristate "IPv4 masquerade support"
125 This is the kernel functionality to provide NAT in the masquerade
126 flavour (automatic source address selection).
129 tristate "IPv4 masquerading support for nf_tables"
130 depends on NF_TABLES_IPV4
132 select NF_NAT_MASQUERADE_IPV4
134 This is the expression that provides IPv4 masquerading support for
137 config NFT_REDIR_IPV4
138 tristate "IPv4 redirect support for nf_tables"
139 depends on NF_TABLES_IPV4
141 select NF_NAT_REDIRECT
143 This is the expression that provides IPv4 redirect support for
146 config NF_NAT_SNMP_BASIC
147 tristate "Basic SNMP-ALG support"
148 depends on NF_CONNTRACK_SNMP
149 depends on NETFILTER_ADVANCED
150 default NF_NAT && NF_CONNTRACK_SNMP
153 This module implements an Application Layer Gateway (ALG) for
154 SNMP payloads. In conjunction with NAT, it allows a network
155 management system to access multiple private networks with
156 conflicting addresses. It works by modifying IP addresses
157 inside SNMP payloads to match IP-layer NAT mapping.
159 This is the "basic" form of SNMP-ALG, as described in RFC 2962
161 To compile it as a module, choose M here. If unsure, say N.
163 config NF_NAT_PROTO_GRE
165 depends on NF_CT_PROTO_GRE
169 depends on NF_CONNTRACK
170 default NF_CONNTRACK_PPTP
171 select NF_NAT_PROTO_GRE
175 depends on NF_CONNTRACK
176 default NF_CONNTRACK_H323
180 config IP_NF_IPTABLES
181 tristate "IP tables support (required for filtering/masq/NAT)"
182 default m if NETFILTER_ADVANCED=n
183 select NETFILTER_XTABLES
185 iptables is a general, extensible packet identification framework.
186 The packet filtering and full NAT (masquerading, port forwarding,
187 etc) subsystems now use this: say `Y' or `M' here if you want to use
190 To compile it as a module, choose M here. If unsure, say N.
195 config IP_NF_MATCH_AH
196 tristate '"ah" match support'
197 depends on NETFILTER_ADVANCED
199 This match extension allows you to match a range of SPIs
200 inside AH header of IPSec packets.
202 To compile it as a module, choose M here. If unsure, say N.
204 config IP_NF_MATCH_ECN
205 tristate '"ecn" match support'
206 depends on NETFILTER_ADVANCED
207 select NETFILTER_XT_MATCH_ECN
209 This is a backwards-compat option for the user's convenience
210 (e.g. when running oldconfig). It selects
211 CONFIG_NETFILTER_XT_MATCH_ECN.
213 config IP_NF_MATCH_RPFILTER
214 tristate '"rpfilter" reverse path filter match support'
215 depends on NETFILTER_ADVANCED
216 depends on IP_NF_MANGLE || IP_NF_RAW
218 This option allows you to match packets whose replies would
219 go out via the interface the packet came in.
221 To compile it as a module, choose M here. If unsure, say N.
222 The module will be called ipt_rpfilter.
224 config IP_NF_MATCH_TTL
225 tristate '"ttl" match support'
226 depends on NETFILTER_ADVANCED
227 select NETFILTER_XT_MATCH_HL
229 This is a backwards-compat option for the user's convenience
230 (e.g. when running oldconfig). It selects
231 CONFIG_NETFILTER_XT_MATCH_HL.
233 # `filter', generic and specific targets
235 tristate "Packet filtering"
236 default m if NETFILTER_ADVANCED=n
238 Packet filtering defines a table `filter', which has a series of
239 rules for simple packet filtering at local input, forwarding and
240 local output. See the man page for iptables(8).
242 To compile it as a module, choose M here. If unsure, say N.
244 config IP_NF_TARGET_REJECT
245 tristate "REJECT target support"
246 depends on IP_NF_FILTER
247 select NF_REJECT_IPV4
248 default m if NETFILTER_ADVANCED=n
250 The REJECT target allows a filtering rule to specify that an ICMP
251 error should be issued in response to an incoming packet, rather
252 than silently being dropped.
254 To compile it as a module, choose M here. If unsure, say N.
256 config IP_NF_TARGET_SYNPROXY
257 tristate "SYNPROXY target support"
258 depends on NF_CONNTRACK && NETFILTER_ADVANCED
259 select NETFILTER_SYNPROXY
262 The SYNPROXY target allows you to intercept TCP connections and
263 establish them using syncookies before they are passed on to the
264 server. This allows to avoid conntrack and server resource usage
265 during SYN-flood attacks.
267 To compile it as a module, choose M here. If unsure, say N.
269 # NAT + specific targets: nf_conntrack
271 tristate "iptables NAT support"
272 depends on NF_CONNTRACK_IPV4
273 default m if NETFILTER_ADVANCED=n
276 select NETFILTER_XT_NAT
278 This enables the `nat' table in iptables. This allows masquerading,
279 port forwarding and other forms of full Network Address Port
282 To compile it as a module, choose M here. If unsure, say N.
286 config IP_NF_TARGET_MASQUERADE
287 tristate "MASQUERADE target support"
288 select NF_NAT_MASQUERADE_IPV4
289 default m if NETFILTER_ADVANCED=n
291 Masquerading is a special case of NAT: all outgoing connections are
292 changed to seem to come from a particular interface's address, and
293 if the interface goes down, those connections are lost. This is
294 only useful for dialup accounts with dynamic IP address (ie. your IP
295 address will be different on next dialup).
297 To compile it as a module, choose M here. If unsure, say N.
299 config IP_NF_TARGET_NETMAP
300 tristate "NETMAP target support"
301 depends on NETFILTER_ADVANCED
302 select NETFILTER_XT_TARGET_NETMAP
304 This is a backwards-compat option for the user's convenience
305 (e.g. when running oldconfig). It selects
306 CONFIG_NETFILTER_XT_TARGET_NETMAP.
308 config IP_NF_TARGET_REDIRECT
309 tristate "REDIRECT target support"
310 depends on NETFILTER_ADVANCED
311 select NETFILTER_XT_TARGET_REDIRECT
313 This is a backwards-compat option for the user's convenience
314 (e.g. when running oldconfig). It selects
315 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
319 # mangle + specific targets
321 tristate "Packet mangling"
322 default m if NETFILTER_ADVANCED=n
324 This option adds a `mangle' table to iptables: see the man page for
325 iptables(8). This table is used for various packet alterations
326 which can effect how the packet is routed.
328 To compile it as a module, choose M here. If unsure, say N.
330 config IP_NF_TARGET_CLUSTERIP
331 tristate "CLUSTERIP target support"
332 depends on IP_NF_MANGLE
333 depends on NF_CONNTRACK_IPV4
334 depends on NETFILTER_ADVANCED
335 select NF_CONNTRACK_MARK
337 The CLUSTERIP target allows you to build load-balancing clusters of
338 network servers without having a dedicated load-balancing
339 router/server/switch.
341 To compile it as a module, choose M here. If unsure, say N.
343 config IP_NF_TARGET_ECN
344 tristate "ECN target support"
345 depends on IP_NF_MANGLE
346 depends on NETFILTER_ADVANCED
348 This option adds a `ECN' target, which can be used in the iptables mangle
351 You can use this target to remove the ECN bits from the IPv4 header of
352 an IP packet. This is particularly useful, if you need to work around
353 existing ECN blackholes on the internet, but don't want to disable
354 ECN support in general.
356 To compile it as a module, choose M here. If unsure, say N.
358 config IP_NF_TARGET_TTL
359 tristate '"TTL" target support'
360 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
361 select NETFILTER_XT_TARGET_HL
363 This is a backwards-compatible option for the user's convenience
364 (e.g. when running oldconfig). It selects
365 CONFIG_NETFILTER_XT_TARGET_HL.
367 # raw + specific targets
369 tristate 'raw table support (required for NOTRACK/TRACE)'
371 This option adds a `raw' table to iptables. This table is the very
372 first in the netfilter framework and hooks in at the PREROUTING
375 If you want to compile it as a module, say M here and read
376 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
378 # security table for MAC policy
379 config IP_NF_SECURITY
380 tristate "Security table"
382 depends on NETFILTER_ADVANCED
384 This option adds a `security' table to iptables, for use
385 with Mandatory Access Control (MAC) policy.
389 endif # IP_NF_IPTABLES
392 config IP_NF_ARPTABLES
393 tristate "ARP tables support"
394 select NETFILTER_XTABLES
395 depends on NETFILTER_ADVANCED
397 arptables is a general, extensible packet identification framework.
398 The ARP packet filtering and mangling (manipulation)subsystems
399 use this: say Y or M here if you want to use either of those.
401 To compile it as a module, choose M here. If unsure, say N.
405 config IP_NF_ARPFILTER
406 tristate "ARP packet filtering"
408 ARP packet filtering defines a table `filter', which has a series of
409 rules for simple ARP packet filtering at local input and
410 local output. On a bridge, you can also specify filtering rules
411 for forwarded ARP packets. See the man page for arptables(8).
413 To compile it as a module, choose M here. If unsure, say N.
415 config IP_NF_ARP_MANGLE
416 tristate "ARP payload mangling"
418 Allows altering the ARP packet payload: source and destination
419 hardware and network addresses.
421 endif # IP_NF_ARPTABLES