2 # IP netfilter configuration
5 menu "IP: Netfilter Configuration"
6 depends on INET && NETFILTER
8 config NF_CONNTRACK_IPV4
9 tristate "IPv4 connection tracking support (required for NAT)"
10 depends on NF_CONNTRACK
11 default m if NETFILTER_ADVANCED=n
13 Connection tracking keeps a record of what packets have passed
14 through your machine, in order to figure out how they are related
17 This is IPv4 support on Layer 3 independent connection tracking.
18 Layer 3 independent connection tracking is experimental scheme
19 which generalize ip_conntrack to support other layer 3 protocols.
21 To compile it as a module, choose M here. If unsure, say N.
23 config NF_CONNTRACK_PROC_COMPAT
24 bool "proc/sysctl compatibility with old connection tracking"
25 depends on NF_CONNTRACK_IPV4
28 This option enables /proc and sysctl compatibility with the old
29 layer 3 dependant connection tracking. This is needed to keep
30 old programs that have not been adapted to the new names working.
35 tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
36 depends on NETFILTER_ADVANCED
38 Netfilter has the ability to queue packets to user space: the
39 netlink device can be used to access them using this driver.
41 This option enables the old IPv4-only "ip_queue" implementation
42 which has been obsoleted by the new "nfnetlink_queue" code (see
43 CONFIG_NETFILTER_NETLINK_QUEUE).
45 To compile it as a module, choose M here. If unsure, say N.
48 tristate "IP tables support (required for filtering/masq/NAT)"
49 default m if NETFILTER_ADVANCED=n
50 select NETFILTER_XTABLES
52 iptables is a general, extensible packet identification framework.
53 The packet filtering and full NAT (masquerading, port forwarding,
54 etc) subsystems now use this: say `Y' or `M' here if you want to use
57 To compile it as a module, choose M here. If unsure, say N.
60 config IP_NF_MATCH_RECENT
61 tristate '"recent" match support'
62 depends on IP_NF_IPTABLES
63 depends on NETFILTER_ADVANCED
65 This match is used for creating one or many lists of recently
66 used addresses and then matching against that/those list(s).
68 Short options are available by using 'iptables -m recent -h'
69 Official Website: <http://snowman.net/projects/ipt_recent/>
71 To compile it as a module, choose M here. If unsure, say N.
73 config IP_NF_MATCH_ECN
74 tristate '"ecn" match support'
75 depends on IP_NF_IPTABLES
76 depends on NETFILTER_ADVANCED
78 This option adds a `ECN' match, which allows you to match against
79 the IPv4 and TCP header ECN fields.
81 To compile it as a module, choose M here. If unsure, say N.
84 tristate '"ah" match support'
85 depends on IP_NF_IPTABLES
86 depends on NETFILTER_ADVANCED
88 This match extension allows you to match a range of SPIs
89 inside AH header of IPSec packets.
91 To compile it as a module, choose M here. If unsure, say N.
93 config IP_NF_MATCH_TTL
94 tristate '"ttl" match support'
95 depends on IP_NF_IPTABLES
96 depends on NETFILTER_ADVANCED
98 This adds CONFIG_IP_NF_MATCH_TTL option, which enabled the user
99 to match packets by their TTL value.
101 To compile it as a module, choose M here. If unsure, say N.
103 config IP_NF_MATCH_ADDRTYPE
104 tristate '"addrtype" address type match support'
105 depends on IP_NF_IPTABLES
106 depends on NETFILTER_ADVANCED
108 This option allows you to match what routing thinks of an address,
109 eg. UNICAST, LOCAL, BROADCAST, ...
111 If you want to compile it as a module, say M here and read
112 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
114 # `filter', generic and specific targets
116 tristate "Packet filtering"
117 depends on IP_NF_IPTABLES
118 default m if NETFILTER_ADVANCED=n
120 Packet filtering defines a table `filter', which has a series of
121 rules for simple packet filtering at local input, forwarding and
122 local output. See the man page for iptables(8).
124 To compile it as a module, choose M here. If unsure, say N.
126 config IP_NF_TARGET_REJECT
127 tristate "REJECT target support"
128 depends on IP_NF_FILTER
129 default m if NETFILTER_ADVANCED=n
131 The REJECT target allows a filtering rule to specify that an ICMP
132 error should be issued in response to an incoming packet, rather
133 than silently being dropped.
135 To compile it as a module, choose M here. If unsure, say N.
137 config IP_NF_TARGET_LOG
138 tristate "LOG target support"
139 depends on IP_NF_IPTABLES
140 default m if NETFILTER_ADVANCED=n
142 This option adds a `LOG' target, which allows you to create rules in
143 any iptables table which records the packet header to the syslog.
145 To compile it as a module, choose M here. If unsure, say N.
147 config IP_NF_TARGET_ULOG
148 tristate "ULOG target support"
149 depends on IP_NF_IPTABLES
150 default m if NETFILTER_ADVANCED=n
153 This option enables the old IPv4-only "ipt_ULOG" implementation
154 which has been obsoleted by the new "nfnetlink_log" code (see
155 CONFIG_NETFILTER_NETLINK_LOG).
157 This option adds a `ULOG' target, which allows you to create rules in
158 any iptables table. The packet is passed to a userspace logging
159 daemon using netlink multicast sockets; unlike the LOG target
160 which can only be viewed through syslog.
162 The appropriate userspace logging daemon (ulogd) may be obtained from
163 <http://www.gnumonks.org/projects/ulogd/>
165 To compile it as a module, choose M here. If unsure, say N.
167 # NAT + specific targets: nf_conntrack
170 depends on IP_NF_IPTABLES && NF_CONNTRACK_IPV4
171 default m if NETFILTER_ADVANCED=n
173 The Full NAT option allows masquerading, port forwarding and other
174 forms of full Network Address Port Translation. It is controlled by
175 the `nat' table in iptables: see the man page for iptables(8).
177 To compile it as a module, choose M here. If unsure, say N.
184 config IP_NF_TARGET_MASQUERADE
185 tristate "MASQUERADE target support"
187 default m if NETFILTER_ADVANCED=n
189 Masquerading is a special case of NAT: all outgoing connections are
190 changed to seem to come from a particular interface's address, and
191 if the interface goes down, those connections are lost. This is
192 only useful for dialup accounts with dynamic IP address (ie. your IP
193 address will be different on next dialup).
195 To compile it as a module, choose M here. If unsure, say N.
197 config IP_NF_TARGET_REDIRECT
198 tristate "REDIRECT target support"
200 depends on NETFILTER_ADVANCED
202 REDIRECT is a special case of NAT: all incoming connections are
203 mapped onto the incoming interface's address, causing the packets to
204 come to the local machine instead of passing through. This is
205 useful for transparent proxies.
207 To compile it as a module, choose M here. If unsure, say N.
209 config IP_NF_TARGET_NETMAP
210 tristate "NETMAP target support"
212 depends on NETFILTER_ADVANCED
214 NETMAP is an implementation of static 1:1 NAT mapping of network
215 addresses. It maps the network address part, while keeping the host
216 address part intact. It is similar to Fast NAT, except that
217 Netfilter's connection tracking doesn't work well with Fast NAT.
219 To compile it as a module, choose M here. If unsure, say N.
221 config NF_NAT_SNMP_BASIC
222 tristate "Basic SNMP-ALG support"
224 depends on NETFILTER_ADVANCED
227 This module implements an Application Layer Gateway (ALG) for
228 SNMP payloads. In conjunction with NAT, it allows a network
229 management system to access multiple private networks with
230 conflicting addresses. It works by modifying IP addresses
231 inside SNMP payloads to match IP-layer NAT mapping.
233 This is the "basic" form of SNMP-ALG, as described in RFC 2962
235 To compile it as a module, choose M here. If unsure, say N.
237 # If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
238 # or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
239 # From kconfig-language.txt:
241 # <expr> '&&' <expr> (6)
243 # (6) Returns the result of min(/expr/, /expr/).
244 config NF_NAT_PROTO_GRE
246 depends on NF_NAT && NF_CT_PROTO_GRE
248 config NF_NAT_PROTO_UDPLITE
250 depends on NF_NAT && NF_CT_PROTO_UDPLITE
251 default NF_NAT && NF_CT_PROTO_UDPLITE
255 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
256 default NF_NAT && NF_CONNTRACK_FTP
260 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
261 default NF_NAT && NF_CONNTRACK_IRC
265 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
266 default NF_NAT && NF_CONNTRACK_TFTP
270 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
271 default NF_NAT && NF_CONNTRACK_AMANDA
275 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
276 default NF_NAT && NF_CONNTRACK_PPTP
277 select NF_NAT_PROTO_GRE
281 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
282 default NF_NAT && NF_CONNTRACK_H323
286 depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
287 default NF_NAT && NF_CONNTRACK_SIP
289 # mangle + specific targets
291 tristate "Packet mangling"
292 depends on IP_NF_IPTABLES
293 default m if NETFILTER_ADVANCED=n
295 This option adds a `mangle' table to iptables: see the man page for
296 iptables(8). This table is used for various packet alterations
297 which can effect how the packet is routed.
299 To compile it as a module, choose M here. If unsure, say N.
301 config IP_NF_TARGET_ECN
302 tristate "ECN target support"
303 depends on IP_NF_MANGLE
304 depends on NETFILTER_ADVANCED
306 This option adds a `ECN' target, which can be used in the iptables mangle
309 You can use this target to remove the ECN bits from the IPv4 header of
310 an IP packet. This is particularly useful, if you need to work around
311 existing ECN blackholes on the internet, but don't want to disable
312 ECN support in general.
314 To compile it as a module, choose M here. If unsure, say N.
316 config IP_NF_TARGET_TTL
317 tristate 'TTL target support'
318 depends on IP_NF_MANGLE
319 depends on NETFILTER_ADVANCED
321 This option adds a `TTL' target, which enables the user to modify
322 the TTL value of the IP header.
324 While it is safe to decrement/lower the TTL, this target also enables
325 functionality to increment and set the TTL value of the IP header to
326 arbitrary values. This is EXTREMELY DANGEROUS since you can easily
327 create immortal packets that loop forever on the network.
329 To compile it as a module, choose M here. If unsure, say N.
331 config IP_NF_TARGET_CLUSTERIP
332 tristate "CLUSTERIP target support (EXPERIMENTAL)"
333 depends on IP_NF_MANGLE && EXPERIMENTAL
334 depends on NF_CONNTRACK_IPV4
335 depends on NETFILTER_ADVANCED
336 select NF_CONNTRACK_MARK
338 The CLUSTERIP target allows you to build load-balancing clusters of
339 network servers without having a dedicated load-balancing
340 router/server/switch.
342 To compile it as a module, choose M here. If unsure, say N.
344 # raw + specific targets
346 tristate 'raw table support (required for NOTRACK/TRACE)'
347 depends on IP_NF_IPTABLES
348 depends on NETFILTER_ADVANCED
350 This option adds a `raw' table to iptables. This table is the very
351 first in the netfilter framework and hooks in at the PREROUTING
354 If you want to compile it as a module, say M here and read
355 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
358 config IP_NF_ARPTABLES
359 tristate "ARP tables support"
360 select NETFILTER_XTABLES
361 depends on NETFILTER_ADVANCED
363 arptables is a general, extensible packet identification framework.
364 The ARP packet filtering and mangling (manipulation)subsystems
365 use this: say Y or M here if you want to use either of those.
367 To compile it as a module, choose M here. If unsure, say N.
369 config IP_NF_ARPFILTER
370 tristate "ARP packet filtering"
371 depends on IP_NF_ARPTABLES
373 ARP packet filtering defines a table `filter', which has a series of
374 rules for simple ARP packet filtering at local input and
375 local output. On a bridge, you can also specify filtering rules
376 for forwarded ARP packets. See the man page for arptables(8).
378 To compile it as a module, choose M here. If unsure, say N.
380 config IP_NF_ARP_MANGLE
381 tristate "ARP payload mangling"
382 depends on IP_NF_ARPTABLES
384 Allows altering the ARP packet payload: source and destination
385 hardware and network addresses.