SHOREWALL6-RULES(5) [FIXME: manual] SHOREWALL6-RULES(5)NAME
rules - Shorewall6 rules file
SYNOPSIS
/etc/shorewall6/rules
DESCRIPTION
Entries in this file govern connection establishment by defining
exceptions to the policies laid out in shorewall6-policy[1](5). By
default, subsequent requests and responses are automatically allowed
using connection tracking. For any particular (source,dest) pair of
zones, the rules are evaluated in the order in which they appear in
this file and the first terminating match is the one that determines
the disposition of the request. All rules are terminating except LOG
and QUEUE rules.
The rules file is divided into sections. Each section is introduced by
a "Section Header" which is a line beginning with SECTION and followed
by the section name.
Sections are as follows and must appear in the order listed:
ALL
This section was added in Shorewall 4.4.23. rules in this section
are applied, regardless of the connection tracking state of the
packet.
ESTABLISHED
Packets in the ESTABLISHED state are processed by rules in this
section.
The only ACTIONs allowed in this section are ACCEPT, DROP, REJECT,
LOG and QUEUE
There is an implicit ACCEPT rule inserted at the end of this
section.
RELATED
Packets in the RELATED state are processed by rules in this
section.
The only ACTIONs allowed in this section are ACCEPT, DROP, REJECT,
LOG and QUEUE
There is an implicit rule added at the end of this section that
invokes the RELATED_DISPOSITION (shorewall6.conf[2](5)).
INVALID
Added in Shorewall 4.5.13. Packets in the INVALID state are
processed by rules in this section.
The only Actions allowed in this section are ACCEPT, DROP, REJECT,
LOG and QUEUE.
There is an implicit rule added at the end of this section that
invokes the INVALID_DISPOSITION (shorewall6.conf[2](5)).
UNTRACKED
Added in Shorewall 4.5.13. Packets in the UNTRACKED state are
processed by rules in this section.
The only Actions allowed in this section are ACCEPT, DROP, REJECT,
LOG and QUEUE.
There is an implicit rule added at the end of this section that
invokes the UNTRACKED_DISPOSITION (shorewall6.conf[2](5)).
NEW
Packets in the NEW, INVALID and UNTRACKED states are processed by
rules in this section.
Note
If you are not familiar with Netfilter to the point where you are
comfortable with the differences between the various connection
tracking states, then it is suggested that you omit the ESTABLISHED
and RELATED sections and place all of your rules in the NEW section
(That's after the line that reads SECTION NEW').
Warning
If you specify FASTACCEPT=Yes in shorewall6.conf[2](5) then the
ESTABLISHED and RELATED sections must be empty.
An except is made if you are running Shorewall 4.4.27 or later and
you have specified a non-default value for RELATED_DISPOSITION or
RELATED_LOG_LEVEL. In that case, you may have rules in the RELATED
section of this file.
You may omit any section that you don't need. If no Section Headers
appear in the file then all rules are assumed to be in the NEW section.
The columns in the file are as follows (where the column name is
followed by a different name in parentheses, the different name is used
in the alternate specification syntax).
ACTION - target[:{log-level|none}[!][:tag]]
Specifies the action to be taken if the connection request matches
the rule. target must be one of the following.
ACCEPT
Allow the connection request.
ACCEPT+
like ACCEPT but also excludes the connection from any
subsequent matching DNAT[-] or REDIRECT[-] rules. Requires
Shorewall 4.5.14 or later.
ACCEPT!
like ACCEPT but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
action
The name of an action declared in shorewall6-actions[3](5) or
in /usr/share/shorewall/actions.std.
ADD(ipset:flags)
Added in Shorewall 4.4.12. Causes addresses and/or port numbers
to be added to the named ipset. The flags specify the address
or tuple to be added to the set and must match the type of
ipset involved. For example, for an iphash ipset, either the
SOURCE or DESTINATION address can be added using flags src or
dst respectively (see the -A command in ipset (8)).
ADD is non-terminating. Even if a packet matches the rule, it
is passed on to the next rule.
AUDIT[(accept|drop|reject)]
Added in Shorewall 4.5.10. Audits the packet with the specified
type; if the type is omitted, then drop is assumed. Require
AUDIT_TARGET support in the kernel and iptables.
A_ACCEPT, and A_ACCEPT!
Added in Shorewall 4.4.20. Audited versions of ACCEPT and
ACCEPT! respectively. Require AUDIT_TARGET support in the
kernel and iptables.
A_DROP and A_DROP!
Added in Shorewall 4.4.20. Audited versions of DROP and DROP!
respectively. Require AUDIT_TARGET support in the kernel and
iptables.
A_REJECT AND A_REJECT!
Added in Shorewall 4.4.20. Audited versions of REJECT and
REJECT! respectively. Require AUDIT_TARGET support in the
kernel and iptables.
[?]COMMENT
the rest of the line will be attached as a comment to the
Netfilter rule(s) generated by the following entries. The
comment will appear delimited by "/* ... */" in the output of
"shorewall show <chain>". To stop the comment from being
attached to further rules, simply include COMMENT on a line by
itself.
Note
Beginning with Shorewall 4.5.11, ?COMMENT is a synonym for
COMMENT and is preferred.
CONTINUE
For experts only.
Do not process any of the following rules for this (source
zone,destination zone). If the source and/or destination IP
address falls into a zone defined later in
shorewall6-zones[4](5) or in a parent zone of the source or
destination zones, then this connection request will be passed
to the rules defined for that (those) zone(s). See
shorewall6-nesting[5](5) for additional information.
CONTINUE!
like CONTINUE but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
COUNT
Simply increment the rule's packet and byte count and pass the
packet to the next rule.
DEL(ipset:flags)
Added in Shorewall 4.4.12. Causes an entry to be deleted from
the named ipset. The flags specify the address or tuple to be
deleted from the set and must match the type of ipset involved.
For example, for an iphash ipset, either the SOURCE or
DESTINATION address can be deleted using flags src or dst
respectively (see the -D command in ipset (8)).
DEL is non-terminating. Even if a packet matches the rule, it
is passed on to the next rule.
DNAT
Forward the request to another system (and optionally another
port). Requires Shorewall 4.5.14 or later.
DNAT-
Advanced users only.
Like DNAT but only generates the DNAT iptables rule and not the
companion ACCEPT rule. Requires Shorewall 4.5.14 or later.
DROP
Ignore the request.
DROP!
like DROP but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
HELPER
Added in Shorewall 4.5.7. This action requires that the HELPER
column contains the name of the Netfilter helper to be
associated with connections matching this connection. May only
be specified in the NEW section and is useful for being able to
specify a helper when the applicable policy is ACCEPT. No
destination zone should be specified in HELPER rules.
INLINE[(action)]
Added in Shorewall 4.5.16. This action allows you to construct
most of the rule yourself using ip6tables syntax. The part that
you specify must follow a semicolon (';') and is completely
free-form. If the target of the rule (the part following 'j')
is something that Shorewall supports in the ACTION column, then
you may enclose it in parentheses (e.g., INLINE(ACCEPT)).
Otherwise, you can include it after the semicolon. In this
case, you must declare the target as a builtin action in
shorewall6-actions[3](5).
Some considerations when using INLINE:
· The p, s, d, i, o, policy, and state match (state or
conntrack --ctstate) matches will always appear in the
front of the rule in that order.
· When multiple matches are specified, the compiler will keep
them in the order in which they appear (excluding the above
listed ones), but they will not necessarily be at the end
of the generated rule. For example, if addresses are
specified in the SOURCE and/or DEST columns, their
generated matches will appear after those specified using
';'.
LOG:level
Simply log the packet and continue with the next rule.
macro[(macrotarget)]
The name of a macro defined in a file named macro.macro. If the
macro accepts an action parameter (Look at the macro source to
see if it has PARAM in the TARGET column) then the macro name
is followed by the parenthesized macrotarget (ACCEPT, DROP,
REJECT, ...) to be substituted for the parameter.
Example: FTP(ACCEPT).
The older syntax where the macro name and the target are
separated by a slash (e.g. FTP/ACCEPT) is still allowed but is
deprecated.
NFLOG[(nflog-parameters)]
Added in Shorewall 4.5.9.3. Queues matching packets to a back
end logging daemon via a netlink socket then continues to the
next rule. See
http://www.shorewall.net/shorewall_logging.html[6].
Similar to LOG:NFLOG[(nflog-parameters)], except that the log
level is not changed when this ACTION is used in an action or
macro and the invocation of that action or macro specifies a
log level.
NFQUEUE[(queuenumber)]
Queues the packet to a user-space application using the
nfnetlink_queue mechanism. If a queuenumber is not specified,
queue zero (0) is assumed.
NFQUEUE![(queuenumber)]
like NFQUEUE but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
NONAT
Excludes the connection from any subsequent DNAT[-] or
REDIRECT[-] rules but doesn't generate a rule to accept the
traffic. Requires Shorewall 4.5.14 or later.
QUEUE
Queue the packet to a user-space application such as ftwall
(http://p2pwall.sf.net). The application may reinsert the
packet for further processing.
QUEUE!
like QUEUE but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
REDIRECT
Redirect the request to a server running on the firewall.
Requires Shorewall 4.5.14 or later.
REDIRECT-
Advanced users only.
Like REDIRECT but only generates the REDIRECT iptables rule and
not the companion ACCEPT rule. Requires Shorewall 4.5.14 or
later.
REJECT
disallow the request and return an icmp-unreachable or an RST
packet.
REJECT!
like REJECT but exempts the rule from being suppressed by
OPTIMIZE=1 in shorewall6.conf[2](5).
The target may optionally be followed by ":" and a syslog log level
(e.g, REJECT:info or Web(ACCEPT):debug). This causes the packet to
be logged at the specified level. Note that if the ACTION involves
destination network address translation (DNAT, REDIRECT, etc.) then
the packet is logged before the destination address is rewritten.
If the ACTION names an action declared in shorewall-actions[7](5)
or in /usr/share/shorewall/actions.std then:
· If the log level is followed by "!' then all rules in the
action are logged at the log level.
· If the log level is not followed by "!" then only those rules
in the action that do not specify logging are logged at the
specified level.
· The special log level none! suppresses logging by the action.
You may also specify ULOG or NFLOG (must be in upper case) as a log
level.This will log to the ULOG or NFLOG target for routing to a
separate log through use of ulogd
(http://www.netfilter.org/projects/ulogd/index.html).
Actions specifying logging may be followed by a log tag (a string
of alphanumeric characters) which is appended to the string
generated by the LOGPREFIX (in shorewall.conf[8](5)).
Example: ACCEPT:info:ftp would include 'ftp ' at the end of the log
prefix generated by the LOGPREFIX setting.
SOURCE -
{zone|zone-list[+]|{all|any}[+][-]}[:interface][:<{address-or-range[,address-or-range]...[exclusion]>|exclusion|+ipset|^countrycode-list}
Source hosts to which the rule applies. May be a zone declared in
/etc/shorewall6/zones, $FW to indicate the firewall itself, all,
all+, all-, all+- or none.
Beginning with Shorewall 4.4.13, you may use a zone-list which
consists of a comma-separated list of zones declared in
shorewall-zones[9] (5). This zone-list may be optionally followed
by "+" to indicate that the rule is to apply to intra-zone traffic
as well as inter-zone traffic.
When none is used either in the SOURCE or DEST column, the rule is
ignored.
all means "All Zones", including the firewall itself. all- means
"All Zones, except the firewall itself". When all[-] is used either
in the SOURCE or DEST column intra-zone traffic is not affected.
When all+[-] is "used, intra-zone traffic is affected. Beginning
with Shorewall 4.4.13, exclusion is supported -- see see
shorewall6-exclusion[10](5).
Except when all[+][-] or any[+][-] is specified, clients may be
further restricted to a list of networks and/or hosts by appending
":" and a comma-separated list of network and/or host addresses.
Hosts may be specified by IP or MAC address; mac addresses must
begin with "~" and must use "-" as a separator.
any is equivalent to all when there are no nested zones. When there
are nested zones, any only refers to top-level zones (those with no
parent zones). Note that any excludes all vserver zones, since
those zones are nested within the firewall zone.
Hosts may also be specified as an IP address range using the syntax
lowaddress-highaddress. This requires that your kernel and
ip6tables contain iprange match support. If your kernel and
ip6tables have ipset match support then you may give the name of an
ipset prefaced by "+". The ipset name may be optionally followed by
a number from 1 to 6 enclosed in square brackets ([]) to indicate
the number of levels of source bindings to be matched.
Beginning with Shorewall6 4.4.17, the primary IP address of a
firewall interface can be specified by an ampersand ('&') followed
by the logical name of the interface as found in the INTERFACE
column of shorewall6-interfaces[11] (5).
Beginning with Shorewall 4.5.4, A countrycode-list may be
specified. A countrycode-list is a comma-separated list of up to 15
two-character ISO-3661 country codes enclosed in square brackets
('[...]') and preceded by a caret ('^'). When a single country code
is given, the square brackets may be omitted. A list of country
codes supported by Shorewall may be found at
http://www.shorewall.net/ISO-3661.html. Specifying a
countrycode-list requires GeoIP Match support in your ip6tables and
Kernel.
When an interface is not specified, you may omit the angled
brackets ('<' and '>') around the address(es) or you may supply
them to improve readability.
You may exclude certain hosts from the set already defined through
use of an exclusion (see shorewall6-exclusion[10](5)).
Examples:
dmz:2002:ce7c::92b4:1::2
Host 2002:ce7c:92b4:1::2 in the DMZ
net:2001:4d48:ad51:24::/64
Subnet 2001:4d48:ad51:24::/64 on the Internet
loc:<2002:cec792b4:1::2,2002:cec792b4:1::44>
Hosts 2002:cec792b4:1::2 and 2002:cec792b4:1::44 in the local
zone.
loc:~00-A0-C9-15-39-78
Host in the local zone with MAC address 00:A0:C9:15:39:78.
net:2001:4d48:ad51:24::/64!2001:4d48:ad51:24:6:/80!2001:4d48:ad51:24:6:/80
Subnet 2001:4d48:ad51:24::/64 on the Internet except for
2001:4d48:ad51:24:6:/80.
$FW:ð0
The primary IP address of eth0 in the firewall zone (Shorewall6
4.4.17 and later).
Alternatively, clients may be specified by interface by appending
":" to the zone name followed by the interface name. For example,
loc:eth1 specifies a client that communicates with the firewall
system through eth1. This may be optionally followed by another
colon (":") and an IP/MAC/subnet address as described above (e.g.,
loc:eth1:<2002:ce7c::92b4:1::2>).
Examples:
loc:eth1:<2002:cec792b4:1::2,2002:cec792b4:1::44>
Hosts 2002:cec792b4:1::2 and 2002:cec792b4:1::44 in the Local
zone, with both originating from eth1
DEST -
{zone|zone-list[+]|all[+][-]}[:interface][:<{address-or-range[,address-or-range]...[exclusion]>|exclusion|+ipset|^countrycode-list}[:port[:random]]
Location of Server. May be a zone declared in
shorewall6-zones[4](5), $FW to indicate the firewall itself, all.
all+ or none.
Beginning with Shorewall 4.4.13, you may use a zone-list which
consists of a comma-separated list of zones declared in
shorewall-zones[9] (5). Ths zone-list may be optionally followed by
"+" to indicate that the rule is to apply to intra-zone traffic as
well as inter-zone traffic. Beginning with Shorewall-4.4.13,
exclusion is supported -- see see shorewall6-exclusion[10](5).
Beginning with Shorewall6 4.4.17, the primary IP address of a
firewall interface can be specified by an ampersand ('&') followed
by the logical name of the interface as found in the INTERFACE
column of shorewall6-interfaces[11] (5).
Beginning with Shorewall 4.5.4, A countrycode-list may be
specified. A countrycode-list is a comma-separated list of up to 15
two-character ISO-3661 country codes enclosed in square brackets
('[...]') and preceded by a caret ('^'). When a single country code
is given, the square brackets may be omitted. A list of country
codes supported by Shorewall may be found at
http://www.shorewall.net/ISO-3661.html. Specifying a
countrycode-list requires GeoIP Match support in your ip6tables and
Kernel.
When none is used either in the SOURCE or DEST column, the rule is
ignored.
When all is used either in the SOURCE or DEST column intra-zone
traffic is not affected. When all+ is used, intra-zone traffic is
affected.
If the DEST zone is a bport zone, then either:
1. the SOURCE must be all[+][-], or
2. the SOURCE zone must be another bport zone associated with the
same bridge, or
3. the SOURCE zone must be an ipv4 zone that is associated with
only the same bridge.
Except when all[+]|[-] is specified, the server may be further
restricted to a particular network, host or interface by appending
":" and the network, host or interface. See SOURCE above.
You may exclude certain hosts from the set already defined through
use of an exclusion (see shorewall6-exclusion[10](5)).
Restriction: MAC addresses are not allowed (this is a Netfilter
restriction).
If you kernel and ip6tables have ipset match support then you may
give the name of an ipset prefaced by "+". The ipset name may be
optionally followed by a number from 1 to 6 enclosed in square
brackets ([]) to indicate the number of levels of destination
bindings to be matched. Only one of the SOURCE and DEST columns may
specify an ipset name.
The port that the server is listening on may be included and
separated from the server's IP address by ":". If omitted, the
firewall will not modify the destination port. A destination port
may only be included if the ACTION is DNAT or REDIRECT.
Example 1:
loc:[2001:470:b:227::44]:3128 specifies a local server at IP
address 2001:470:b:227::44 and listening on port 3128.
Example 2:
loc:[]:3128 specifies that the destination port should be
changed to 3128 but the IP address should remain the same.
The port may be specified as a service name. You may specify a port
range in the form lowport-highport to cause connections to be
assigned to ports in the range in round-robin fashion. When a port
range is specified, lowport and highport must be given as integers;
service names are not permitted. Additionally, the port range may
be optionally followed by :random which causes assignment to ports
in the list to be random.
If the ACTION is REDIRECT or REDIRECT-, this column needs only to
contain the port number on the firewall that the request should be
redirected to. That is equivalent to specifying $FW::port.
PROTO -
{-|tcp:syn|ipp2p|ipp2p:udp|ipp2p:all|protocol-number|protocol-name|all}
Optional protocol - ipp2p* requires ipp2p match support in your
kernel and ip6tables. tcp:syn implies tcp plus the SYN flag must
be set and the RST,ACK and FIN flags must be reset.
Beginning with Shorewall6 4.4.19, this column can contain a
comma-separated list of protocol-numbers and/or protocol names
(e.g., tcp,udp).
DEST PORT(S) (dport) -
{-|port-name-number-or-range[,port-name-number-or-range]...}
Optional destination Ports. A comma-separated list of Port names
(from services(5)), port numbers or port ranges; if the protocol is
icmp, this column is interpreted as the destination icmp-type(s).
ICMP types may be specified as a numeric type, a numeric type and
code separated by a slash (e.g., 3/4), or a typename. See
http://www.shorewall.net/configuration_file_basics.htm#ICMP. Note
that prior to Shorewall6 4.4.19, only a single ICMP type may be
listed.
If the protocol is ipp2p, this column is interpreted as an ipp2p
option without the leading "--" (example bit for bit-torrent). If
no port is given, ipp2p is assumed.
A port range is expressed as lowport:highport.
This column is ignored if PROTO = all but must be entered if any of
the following columns are supplied. In that case, it is suggested
that this field contain a dash (-).
If your kernel contains multi-port match support, then only a
single Netfilter rule will be generated if in this list and the
CLIENT PORT(S) list below:
1. There are 15 or less ports listed.
2. No port ranges are included or your kernel and ip6tables contain
extended multi-port match support.
SOURCE PORT(S) (sport) -
{-|port-name-number-or-range[,port-name-number-or-range]...}
Optional source port(s). If omitted, any source port is acceptable.
Specified as a comma- separated list of port names, port numbers or
port ranges.
Beginning with Shorewall 4.5.15, you may place '=' in this column,
provided that the DEST PORT(S) column is non-empty. This causes the
rule to match when either the source port or the destination port
in a packet matches one of the ports specified in DEST PORTS(S).
Use of '=' requires multi-port match in your iptables and kernel.
Warning
Unless you really understand IP, you should leave this column
empty or place a dash (-) in the column. Most people who try to
use this column get it wrong.
If you don't want to restrict client ports but need to specify a
later column, then place "-" in this column.
If your kernel contains multi-port match support, then only a
single Netfilter rule will be generated if in this list and the
DEST PORT(S) list above:
1. There are 15 or less ports listed.
2. No port ranges are included or your kernel and ip6tables contain
extended multi-port match support.
ORIGINAL DEST (origdest) - [-]
Included for compatibility with Shorewall. Enter '-' in this column
if you need to specify one of the later columns.
RATE LIMIT (rate) -
[-|[{s|d}:[[name]:]]]rate/{sec|min|hour|day}[:burst]
You may optionally rate-limit the rule by placing a value in this
column:
rate is the number of connections per interval (sec or min) and
burst is the largest burst permitted. If no burst is given, a value
of 5 is assumed. There may be no no white-space embedded in the
specification.
Example: 10/sec:20
When s: or d: is specified, the rate applies per source IP address
or per destination IP address respectively. The name may be chosen
by the user and specifies a hash table to be used to count matching
connections. If not given, the name shorewallN (where N is a unique
integer) is assumed. Where more than one POLICY specifies the same
name, the connections counts for the rules are aggregated and the
individual rates apply to the aggregated count.
USER/GROUP (user) -
[!][user-name-or-number-or-range][:group-name-or-number-or-range]
This optional column may only be non-empty if the SOURCE is the
firewall itself.
When this column is non-empty, the rule applies only if the program
generating the output is running under the effective user and/or
group specified (or is NOT running under that id if "!" is given).
Beginning with Shorewall 4.5.8, multiple user or group names/ids
separated by commas may be specified.
Examples:
joe
program must be run by joe
:kids
program must be run by a member of the 'kids' group
!:kids
program must not be run by a member of the 'kids' group
2001-2099
UIDs 2001 through 2099 (Shorewall 4.5.6 and later)
MARK - [!]value[/mask][:C]
Defines a test on the existing packet or connection mark. The rule
will match only if the test returns true.
If you don't want to define a test but need to specify anything in
the following columns, place a "-" in this field.
!
Inverts the test (not equal)
value
Value of the packet or connection mark.
mask
A mask to be applied to the mark before testing.
:C
Designates a connection mark. If omitted, the packet mark's
value is tested.
CONNLIMIT - [!]limit[:mask]
May be used to limit the number of simultaneous connections from
each individual host to limit connections. Requires connlimit match
in your kernel and ip6tables. While the limit is only checked on
rules specifying CONNLIMIT, the number of current connections is
calculated over all current connections from the SOURCE host. By
default, the limit is applied to each host but can be made to apply
to networks of hosts by specifying a mask. The mask specifies the
width of a VLSM mask to be applied to the source address; the
number of current connections is then taken over all hosts in the
subnet source-address/mask. When ! is specified, the rule matches
when the number of connection exceeds the limit.
TIME - timeelement[&timeelement...]
May be used to limit the rule to a particular time period each day,
to particular days of the week or month, or to a range defined by
dates and times. Requires time match support in your kernel and
ip6tables.
timeelement may be:
timestart=hh:mm[:ss]
Defines the starting time of day.
timestop=hh:mm[:ss]
Defines the ending time of day.
utc
Times are expressed in Greenwich Mean Time.
localtz
Deprecated by the Netfilter team in favor of kerneltz. Times
are expressed in Local Civil Time (default).
kerneltz
Added in Shorewall 4.5.2. Times are expressed in Local Kernel
Time (requires iptables 1.4.12 or later).
weekdays=ddd[,ddd]...
where ddd is one of Mon, Tue, Wed, Thu, Fri, Sat or Sun
monthdays=dd[,dd],...
where dd is an ordinal day of the month
datestart=yyyy[-mm[-dd[Thh[:mm[:ss]]]]]
Defines the starting date and time.
datestop=yyyy[-mm[-dd[Thh[:mm[:ss]]]]]
Defines the ending date and time.
HEADERS - [!][any:|exactly:]header-list (Optional - Added in Shorewall
4.4.15)
The header-list consists of a comma-separated list of headers from
the following list.
auth, ah, or 51
Authentication Headers extension header.
esp, or 50
Encrypted Security Payload extension header.
hop, hop-by-hop or 0
Hop-by-hop options extension header.
route, ipv6-route or 41
IPv6 Route extension header.
frag, ipv6-frag or 44
IPv6 fragmentation extension header.
none, ipv6-nonxt or 59
No next header
proto, protocol or 255
Any protocol header.
If any: is specified, the rule will match if any of the listed
headers are present. If exactly: is specified, the will match
packets that exactly include all specified headers. If neither is
given, any: is assumed.
If ! is entered, the rule will match those packets which would not
be matched when ! is omitted.
SWITCH - [!]switch-name[={0|1}]
Added in Shorewall6 4.4.24 and allows enabling and disabling the
rule without requiring shorewall6 restart.
Enables the rule if the value stored in
/proc/net/nf_condition/switch-name is 1. Disables the rule if that
file contains 0 (the default). If '!' is supplied, the test is
inverted such that the rule is enabled if the file contains 0.
Within the switch-name, '@0' and '@{0}' are replaced by the name of
the chain to which the rule is a added. The switch-name (after
'@...' expansion) must begin with a letter and be composed of
letters, decimal digits, underscores or hyphens. Switch names must
be 30 characters or less in length.
Switches are normally off. To turn a switch on:
echo 1 >
/proc/net/nf_condition/switch-name
To turn it off again:
echo 0 >
/proc/net/nf_condition/switch-name
Switch settings are retained over shorewall6 restart.
Beginning with Shorewall 4.5.10, when the switch-name is followed
by =0 or =1, then the switch is initialized to off or on
respectively by the start command. Other commands do not affect the
switch setting.
HELPER - [helper]
Added in Shorewall 4.5.7.
In the NEW section, causes the named conntrack helper to be
associated with this connection; the contents of this column are
ignored unless ACTION is ACCEPT*, DNAT* or REDIRECT*.
In the RELATED section, will only match if the related connection
has the named helper associated with it.
The helper may be one of:
amanda
ftp
irc
netbios-ns
pptp
Q.931
RAS
sane
sip
snmp
tftp
If the HELPERS option is specified in shorewall.conf[8](5), then
any module specified in this column must be listed in the HELPERS
setting.
EXAMPLE
Example 1:
Accept SMTP requests from the DMZ to the internet
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL
# PORT PORT(S) DEST
ACCEPT dmz net tcp smtp
Example 4:
You want to accept SSH connections to your firewall only from
internet IP addresses 2002:ce7c::92b4:1::2 and
2002:ce7c::92b4:1::22
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL
# PORT PORT(S) DEST
ACCEPT net:<2002:ce7c::92b4:1::2,2002:ce7c::92b4:1::22> \
$FW tcp 22
Example 5:
You wish to limit SSH connections from remote systems to 1/min with
a burst of three (to allow for limited retry):
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE
# PORT(S)PORT(S) DEST LIMIT
SSH(ACCEPT) net all - - - - s:1/min:3
Example 6:
Forward port 80 to dmz host $BACKUP if switch 'primary_down' is
set.
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/ MARK CONNLIMIT TIME HEADERS SWITCH
# PORT(S)PORT(S) DEST LIMIT GROUP
DNAT net dmz:$BACKUP tcp 80 - - - - - - - - primary_down
Example 7:
Drop all email from IP addresses in the country whose ISO-3661
country code is ZZ.
#ACTION SOURCE DEST PROTO DEST
# PORT(S)
DROP net:^ZZ fw tcp 25
Example 8:
You want to generate your own rule involving ip6tables targets and
matches not supported by Shorewall.
#ACTION SOURCE DEST PROTO DEST
# PORT(S)
INLINE $FW net ; -p 6 -m mickey-mouse --name test -m set --match-set set1 src -m mickey-mouse --name test2 -j SECCTX --name test3
The above will generate the following ip6tables-restore input:
-A fw2net -p 6 -m mickey-mouse --name test -m set --match-set set1 src -m mickey-mouse --name test2 -j SECCTX --name test3
Note that SECCTX must be defined as a builtin action in
shorewall6-actions[3](5):
#ACTION OPTIONS
SECCTX builtin
FILES
/etc/shorewall6/rules
SEE ALSO
http://www.shorewall.net/shorewall_logging.html
http://shorewall.net/configuration_file_basics.htm#Pairs
shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5),
shorewall6-blacklist(5), shorewall6-blrules(5), shorewall6-hosts(5),
shorewall6-interfaces(5), shorewall6-maclist(5),
shorewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5),
shorewall6-providers(5), shorewall6-rtrules(5),
shorewall6-routestopped(5), shorewall6.conf(5), shorewall6-secmarks(5),
shorewall6-tcclasses(5), shorewall6-tcdevices(5),
shorewall6-tcrules(5), shorewall6-tos(5), shorewall6-tunnels(5),
shorewall6-zones(5)NOTES
1. shorewall6-policy
http://www.shorewall.net/manpages6/shorewall6-policy.html
2. shorewall6.conf
http://www.shorewall.net/manpages6/shorewall6.conf.html
3. shorewall6-actions
http://www.shorewall.net/manpages6/shorewall6-actions.html
4. shorewall6-zones
http://www.shorewall.net/manpages6/shorewall6-zones.html
5. shorewall6-nesting
http://www.shorewall.net/manpages6/shorewall6-nesting.html
6. http://www.shorewall.net/shorewall_logging.html
http://www.shorewall.net/shorewall.logging.html
7. shorewall-actions
http://www.shorewall.net/manpages6/shorewall-actions.html
8. shorewall.conf
http://www.shorewall.net/manpages6/shorewall.conf.html
9. shorewall-zones
http://www.shorewall.net/manpages6/shorewall-zones.html
10. shorewall6-exclusion
http://www.shorewall.net/manpages6/shorewall6-exclusion.html
11. shorewall6-interfaces
http://www.shorewall.net/manpages6/shorewall-interfaces.html
[FIXME: source] 12/19/2013 SHOREWALL6-RULES(5)
