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.
28 config NF_CONNTRACK_PROC_COMPAT
29 bool "proc/sysctl compatibility with old connection tracking"
30 depends on NF_CONNTRACK_PROCFS && NF_CONNTRACK_IPV4
33 This option enables /proc and sysctl compatibility with the old
34 layer 3 dependent connection tracking. This is needed to keep
35 old programs that have not been adapted to the new names working.
42 tristate "IPv4 nf_tables support"
44 This option enables the IPv4 support for nf_tables.
48 config NFT_CHAIN_ROUTE_IPV4
49 tristate "IPv4 nf_tables route chain support"
51 This option enables the "route" chain for IPv4 in nf_tables. This
52 chain type is used to force packet re-routing after mangling header
53 fields such as the source, destination, type of service and
56 config NFT_REJECT_IPV4
62 tristate "IPv4 nf_tables packet duplication support"
63 depends on !NF_CONNTRACK || NF_CONNTRACK
66 This module enables IPv4 packet duplication support for nf_tables.
68 endif # NF_TABLES_IPV4
71 tristate "ARP nf_tables support"
73 This option enables the ARP support for nf_tables.
78 tristate "Netfilter IPv4 packet duplication to alternate destination"
79 depends on !NF_CONNTRACK || NF_CONNTRACK
81 This option enables the nf_dup_ipv4 core, which duplicates an IPv4
82 packet to be rerouted to another destination.
85 tristate "ARP packet logging"
86 default m if NETFILTER_ADVANCED=n
90 tristate "IPv4 packet logging"
91 default m if NETFILTER_ADVANCED=n
95 tristate "IPv4 packet rejection"
96 default m if NETFILTER_ADVANCED=n
100 depends on NF_CONNTRACK_IPV4
101 default m if NETFILTER_ADVANCED=n
104 The IPv4 NAT option allows masquerading, port forwarding and other
105 forms of full Network Address Port Translation. This can be
106 controlled by iptables or nft.
110 config NFT_CHAIN_NAT_IPV4
111 depends on NF_TABLES_IPV4
112 tristate "IPv4 nf_tables nat chain support"
114 This option enables the "nat" chain for IPv4 in nf_tables. This
115 chain type is used to perform Network Address Translation (NAT)
116 packet transformations such as the source, destination address and
117 source and destination ports.
119 config NF_NAT_MASQUERADE_IPV4
120 tristate "IPv4 masquerade support"
122 This is the kernel functionality to provide NAT in the masquerade
123 flavour (automatic source address selection).
126 tristate "IPv4 masquerading support for nf_tables"
127 depends on NF_TABLES_IPV4
129 select NF_NAT_MASQUERADE_IPV4
131 This is the expression that provides IPv4 masquerading support for
134 config NFT_REDIR_IPV4
135 tristate "IPv4 redirect support for nf_tables"
136 depends on NF_TABLES_IPV4
138 select NF_NAT_REDIRECT
140 This is the expression that provides IPv4 redirect support for
143 config NF_NAT_SNMP_BASIC
144 tristate "Basic SNMP-ALG support"
145 depends on NF_CONNTRACK_SNMP
146 depends on NETFILTER_ADVANCED
147 default NF_NAT && NF_CONNTRACK_SNMP
150 This module implements an Application Layer Gateway (ALG) for
151 SNMP payloads. In conjunction with NAT, it allows a network
152 management system to access multiple private networks with
153 conflicting addresses. It works by modifying IP addresses
154 inside SNMP payloads to match IP-layer NAT mapping.
156 This is the "basic" form of SNMP-ALG, as described in RFC 2962
158 To compile it as a module, choose M here. If unsure, say N.
160 config NF_NAT_PROTO_GRE
162 depends on NF_CT_PROTO_GRE
166 depends on NF_CONNTRACK
167 default NF_CONNTRACK_PPTP
168 select NF_NAT_PROTO_GRE
172 depends on NF_CONNTRACK
173 default NF_CONNTRACK_H323
177 config IP_NF_IPTABLES
178 tristate "IP tables support (required for filtering/masq/NAT)"
179 default m if NETFILTER_ADVANCED=n
180 select NETFILTER_XTABLES
182 iptables is a general, extensible packet identification framework.
183 The packet filtering and full NAT (masquerading, port forwarding,
184 etc) subsystems now use this: say `Y' or `M' here if you want to use
187 To compile it as a module, choose M here. If unsure, say N.
192 config IP_NF_MATCH_AH
193 tristate '"ah" match support'
194 depends on NETFILTER_ADVANCED
196 This match extension allows you to match a range of SPIs
197 inside AH header of IPSec packets.
199 To compile it as a module, choose M here. If unsure, say N.
201 config IP_NF_MATCH_ECN
202 tristate '"ecn" match support'
203 depends on NETFILTER_ADVANCED
204 select NETFILTER_XT_MATCH_ECN
206 This is a backwards-compat option for the user's convenience
207 (e.g. when running oldconfig). It selects
208 CONFIG_NETFILTER_XT_MATCH_ECN.
210 config IP_NF_MATCH_RPFILTER
211 tristate '"rpfilter" reverse path filter match support'
212 depends on NETFILTER_ADVANCED
213 depends on IP_NF_MANGLE || IP_NF_RAW
215 This option allows you to match packets whose replies would
216 go out via the interface the packet came in.
218 To compile it as a module, choose M here. If unsure, say N.
219 The module will be called ipt_rpfilter.
221 config IP_NF_MATCH_TTL
222 tristate '"ttl" match support'
223 depends on NETFILTER_ADVANCED
224 select NETFILTER_XT_MATCH_HL
226 This is a backwards-compat option for the user's convenience
227 (e.g. when running oldconfig). It selects
228 CONFIG_NETFILTER_XT_MATCH_HL.
230 # `filter', generic and specific targets
232 tristate "Packet filtering"
233 default m if NETFILTER_ADVANCED=n
235 Packet filtering defines a table `filter', which has a series of
236 rules for simple packet filtering at local input, forwarding and
237 local output. See the man page for iptables(8).
239 To compile it as a module, choose M here. If unsure, say N.
241 config IP_NF_TARGET_REJECT
242 tristate "REJECT target support"
243 depends on IP_NF_FILTER
244 select NF_REJECT_IPV4
245 default m if NETFILTER_ADVANCED=n
247 The REJECT target allows a filtering rule to specify that an ICMP
248 error should be issued in response to an incoming packet, rather
249 than silently being dropped.
251 To compile it as a module, choose M here. If unsure, say N.
253 config IP_NF_TARGET_SYNPROXY
254 tristate "SYNPROXY target support"
255 depends on NF_CONNTRACK && NETFILTER_ADVANCED
256 select NETFILTER_SYNPROXY
259 The SYNPROXY target allows you to intercept TCP connections and
260 establish them using syncookies before they are passed on to the
261 server. This allows to avoid conntrack and server resource usage
262 during SYN-flood attacks.
264 To compile it as a module, choose M here. If unsure, say N.
266 # NAT + specific targets: nf_conntrack
268 tristate "iptables NAT support"
269 depends on NF_CONNTRACK_IPV4
270 default m if NETFILTER_ADVANCED=n
273 select NETFILTER_XT_NAT
275 This enables the `nat' table in iptables. This allows masquerading,
276 port forwarding and other forms of full Network Address Port
279 To compile it as a module, choose M here. If unsure, say N.
283 config IP_NF_TARGET_MASQUERADE
284 tristate "MASQUERADE target support"
285 select NF_NAT_MASQUERADE_IPV4
286 default m if NETFILTER_ADVANCED=n
288 Masquerading is a special case of NAT: all outgoing connections are
289 changed to seem to come from a particular interface's address, and
290 if the interface goes down, those connections are lost. This is
291 only useful for dialup accounts with dynamic IP address (ie. your IP
292 address will be different on next dialup).
294 To compile it as a module, choose M here. If unsure, say N.
296 config IP_NF_TARGET_NETMAP
297 tristate "NETMAP target support"
298 depends on NETFILTER_ADVANCED
299 select NETFILTER_XT_TARGET_NETMAP
301 This is a backwards-compat option for the user's convenience
302 (e.g. when running oldconfig). It selects
303 CONFIG_NETFILTER_XT_TARGET_NETMAP.
305 config IP_NF_TARGET_REDIRECT
306 tristate "REDIRECT target support"
307 depends on NETFILTER_ADVANCED
308 select NETFILTER_XT_TARGET_REDIRECT
310 This is a backwards-compat option for the user's convenience
311 (e.g. when running oldconfig). It selects
312 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
316 # mangle + specific targets
318 tristate "Packet mangling"
319 default m if NETFILTER_ADVANCED=n
321 This option adds a `mangle' table to iptables: see the man page for
322 iptables(8). This table is used for various packet alterations
323 which can effect how the packet is routed.
325 To compile it as a module, choose M here. If unsure, say N.
327 config IP_NF_TARGET_CLUSTERIP
328 tristate "CLUSTERIP target support"
329 depends on IP_NF_MANGLE
330 depends on NF_CONNTRACK_IPV4
331 depends on NETFILTER_ADVANCED
332 select NF_CONNTRACK_MARK
334 The CLUSTERIP target allows you to build load-balancing clusters of
335 network servers without having a dedicated load-balancing
336 router/server/switch.
338 To compile it as a module, choose M here. If unsure, say N.
340 config IP_NF_TARGET_ECN
341 tristate "ECN target support"
342 depends on IP_NF_MANGLE
343 depends on NETFILTER_ADVANCED
345 This option adds a `ECN' target, which can be used in the iptables mangle
348 You can use this target to remove the ECN bits from the IPv4 header of
349 an IP packet. This is particularly useful, if you need to work around
350 existing ECN blackholes on the internet, but don't want to disable
351 ECN support in general.
353 To compile it as a module, choose M here. If unsure, say N.
355 config IP_NF_TARGET_TTL
356 tristate '"TTL" target support'
357 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
358 select NETFILTER_XT_TARGET_HL
360 This is a backwards-compatible option for the user's convenience
361 (e.g. when running oldconfig). It selects
362 CONFIG_NETFILTER_XT_TARGET_HL.
364 # raw + specific targets
366 tristate 'raw table support (required for NOTRACK/TRACE)'
368 This option adds a `raw' table to iptables. This table is the very
369 first in the netfilter framework and hooks in at the PREROUTING
372 If you want to compile it as a module, say M here and read
373 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
375 # security table for MAC policy
376 config IP_NF_SECURITY
377 tristate "Security table"
379 depends on NETFILTER_ADVANCED
381 This option adds a `security' table to iptables, for use
382 with Mandatory Access Control (MAC) policy.
386 endif # IP_NF_IPTABLES
389 config IP_NF_ARPTABLES
390 tristate "ARP tables support"
391 select NETFILTER_XTABLES
392 depends on NETFILTER_ADVANCED
394 arptables is a general, extensible packet identification framework.
395 The ARP packet filtering and mangling (manipulation)subsystems
396 use this: say Y or M here if you want to use either of those.
398 To compile it as a module, choose M here. If unsure, say N.
402 config IP_NF_ARPFILTER
403 tristate "ARP packet filtering"
405 ARP packet filtering defines a table `filter', which has a series of
406 rules for simple ARP packet filtering at local input and
407 local output. On a bridge, you can also specify filtering rules
408 for forwarded ARP packets. See the man page for arptables(8).
410 To compile it as a module, choose M here. If unsure, say N.
412 config IP_NF_ARP_MANGLE
413 tristate "ARP payload mangling"
415 Allows altering the ARP packet payload: source and destination
416 hardware and network addresses.
418 endif # IP_NF_ARPTABLES