Added in Shorewall 5.0.7. When this option is specified, the action is expected to have at least two parameters; the first is a target and the second is either 'audit' or omitted. If the second is 'audit', then the first must be an auditable target (ACCEPT, DROP or REJECT).

Added in Shorewall 4.5.16. Defines the action as a rule target that is supported by your iptables but is not directly supported by Shorewall. The action may be used as the rule target in an INLINE rule in shorewall-rules[1](5).

Beginning with Shorewall 4.6.0, the Netfilter table(s) in which the builtin can be used may be specified: filter, nat, mangle and raw. If no table name(s) are given, then filter is assumed. The table names follow builtin and are separated by commas; for example, "FOOBAR builtin,filter,mangle" would specify FOOBAR as a builtin target that can be used in the filter and mangle tables.

Beginning with Shorewall 4.6.4, you may specify the terminating option with builtin to indicate to the Shorewall optimizer that the action is terminating (the current packet will not be passed to the next rule in the chain).

Causes the action body (defined in action.action-name) to be expanded in-line like a macro rather than in its own chain. You can list Shorewall Standard Actions in this file to specify the inline option.

Added in Shorewall 5.0.8. Performs the same function as nolog (below), with the addition that the jump to the actions chain is logged if a log level is specified on the action invocation. For inline actions, this option is identical to nolog.

Added in Shorewall 5.0.7. Specifies that this action is to be used in shorewall-mangle(5)[2] rather than shorewall-rules(5)[1].

Added in Shorewall 5.0.13. Specifies that this action is to be used in shorewall-snat(5)[3] rather than shorewall-rules(5)[1]. The mangle and nat options are mutually exclusive.

Causes any later inline option for the same action to be ignored with a warning.

Added in Shorewall 4.5.11. When this option is specified, the compiler does not automatically apply the log level and/or tag from the invocation of the action to all rules inside of the action. Rather, it simply sets the $_loglevel and $_logtag shell variables which can be used within the action body to apply those logging options only to a subset of the rules.

Added in Shorewall 5.1.10. Specifies that the action is only usable with the specified protocol (name or number). When the action is invoked with no protocol specified in the PROTO column, or if the action is used as a Policy Action, the named protocol will be assumed. If a protocol is specified in the PROTO column of an invocation, then it must match the named protocol.

The proto option has no effect if the inline or builtin option is specified. A warning is issued if proto is specified along with builtin.

Added in Shorewall 5.2.6. Requires that the proto option be previously given and indicates that this action may only be applied to flows with the specified protocol and portorservice. portorservice may be a valid port number or the name of a service defined in /etc/services to be usable with the specified protocol. If a port or service is specified in the DPORT column of an invocation, then it must match the named portorservice.

Added in Shorewall 5.1.1. When specified, this option causes the rules file section name and a comma to be prepended to the parameters passed to the action (if any). Note that this means that the first parameter passed to the action by the user is actually the second parameter to the action. If the action is invoked out of the blrules file, 'BLACKLIST' is used as the section name.

Given that neither the snat nor the mangle file is sectioned, this parameter has no effect when mangle or nat is specified.

Added in Shorewall 5.0.7. Reserved for use by Shorewall in actions.std.

Added in Shorewall 4.6.4. When used with builtin, indicates that the built-in action is termiating (i.e., if the action is jumped to, the next rule in the chain is not evaluated).