shorewall-accounting

## Name

accounting — Shorewall Accounting file

## Synopsis

`/etc/shorewall[6]/accounting`

## Description

Accounting rules exist simply to count packets and bytes in categories that you define in this file. You may display these rules and their packet and byte counters using the shorewall show accounting command.

Beginning with Shorewall 4.4.18, the accounting structure can be created with three root chains:

- accountin: Rules that are valid in the INPUT chain (may not specify an output interface).

- accountout: Rules that are valid in the OUTPUT chain (may not specify an input interface or a MAC address).

- accounting: Other rules.

The new structure is enabled by sectioning the accounting file in a manner similar to the rules file. The sections are INPUT, OUTPUT and FORWARD and must appear in that order (although any of them may be omitted). The first non-commentary record in the accounting file must be a section header when sectioning is used.

### Warning

If sections are not used, the Shorewall rules compiler cannot detect certain violations of netfilter restrictions. These violations can result in run-time errors such as the following:

> iptables-restore v1.4.13: Can't use -o with INPUT

Beginning with Shorewall 4.4.20, the ACCOUNTING_TABLE setting was added to shorewall.conf and shorewall6.conf. That setting determines the Netfilter table (filter or mangle) where the accounting rules are added. When ACCOUNTING_TABLE=mangle is specified, the available sections are PREROUTING, INPUT, OUTPUT, FORWARD and POSTROUTING.

Section headers have the form:

`?SECTION` `section-name`

When sections are enabled:

- A jump to a user-defined accounting chain must appear before entries that add rules to that chain. This eliminates loops and unreferenced chains.

- An output interface may not be specified in the PREROUTING and INPUT sections.

- In the OUTPUT and POSTROUTING sections:

  - An input interface may not be specified

  - Jumps to a chain defined in the INPUT or PREROUTING sections that specifies an input interface are prohibited

  - MAC addresses may not be used

  - Jump to a chain defined in the INPUT or PREROUTING section that specifies a MAC address are prohibited.

- The default value of the CHAIN column is:

  - accountin in the INPUT section

  - accountout in the OUTPUT section

  - accountfwd in the FORWARD section

  - accountpre in the PREROUTING section

  - accountpost in the POSTROUTING section

- Traffic addressed to the firewall goes through the rules defined in the INPUT section.

- Traffic originating on the firewall goes through the rules defined in the OUTPUT section.

- Traffic being forwarded through the firewall goes through the rules from the FORWARD sections.

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 - {COUNT|DONE|chain[:{COUNT|JUMP}]|ACCOUNT(`table`,`network`)|[?]COMMENT comment}

  What to do when a matching packet is found.

  COUNT

    Simply count the match and continue with the next rule

  DONE

    Count the match and don't attempt to match any other accounting rules in the chain specified in the CHAIN column.

  chain[:COUNT]

    Where chain is the name of a chain; shorewall will create the chain automatically if it doesn't already exist. If a second chain is mentioned in the CHAIN column, then a jump from this second chain to `chain` is created. If no chain is named in the CHAIN column, then a jump from the default chain to `chain` is created. If :COUNT is included, a counting rule matching this entry will be added to chain. The chain may not exceed 29 characters in length and may be composed of letters, digits, dash ('-') and underscore ('_').

  chain:JUMP

    Like the previous option without the :COUNT part.

  ACCOUNT(`table`,`network`)

    This action implements per-IP accounting and was added in Shorewall 4.4.17. Requires the ACCOUNT Target capability in your iptables and kernel (see the output of shorewall show capabilities).

    `table`

      is the name of an accounting table (you choose the name). All rules specifying the same name will have their per-IP counters accumulated in the same table.

    `network`

      is an IPv4 network in CIDR notation (e.g., 192.168.1.0/24). The network can be as large as a /8 (class A).

    One nice feature of per-IP accounting is that the counters survive shorewall restart. This has a downside, however. If you change the network associated with an accounting table, then you must shorewall stop; shorewall start to have a successful restart (counters will be cleared).

    The counters in a `table` are printed using the iptaccount utility. For a command synopsis, type:

    iptaccount --help

    As of February 2011, the ACCOUNT Target capability and the iptaccount utility are only available when xtables-addons is installed. See https://shorewall.org/Accounting.html#perIP for additional information.

  INLINE

    Added in Shorewall 4.5.16. Allows free form iptables matches to be specified following a ';'. In the generated iptables rule(s), the free form matches will follow any matches that are generated by the column contents.

  NFACCT({`object`[!]}[,...])

    Added in Shorewall 4.5.7. Provides a form of accounting that survives shorewall stop/shorewall start and shorewall restart. Requires the NFaccnt Match capability in your kernel and iptables. `object` names an nfacct object (see man nfaccnt(8)). Multiple rules can specify the same `object`; all packets that match any of the rules increment the packet and bytes count of the object.

    Prior to Shorewall 4.5.16, only one `object` could be specified. Beginning with Shorewall 4.5.16, an arbitrary number of objects may be given.

    With Shorewall 4.5.16 or later, an nfacct `object` in the list may optionally be followed by ! to indicate that the nfacct `object` will be incremented unconditionally for each packet. When ! is omitted, the `object` will be incremented only if all of the matches in the rule succeed.

  NFLOG[(nflog-parameters)] - Added in Shorewall-4.4.20.

    Causes each matching packet to be sent via the currently loaded logging back-end (usually nfnetlink_log) where it is available to accounting daemons through a netlink socket.

  ?COMMENT

    The remainder of the line is treated as a comment which is attached to subsequent rules until another COMMENT line is found or until the end of the file is reached. To stop adding comments to rules, use a line with only the word ?COMMENT.

CHAIN - {-|chain}

  The name of a chain. If specified as - the accounting chain is assumed when the file is un-sectioned. When the file is sectioned, the default is one of accountin, accountout, etc. depending on the section. This is the chain where the accounting rule is added. The chain will be created if it doesn't already exist. The chain may not exceed 29 characters in length.

SOURCE - {-|any|all|interface|interface: address|address}

  Packet Source.

  The name of an `interface`, an `address` (host or net) or an `interface` name followed by ":" and a host or net `address`. An ipset name is also accepted as an `address`.

DEST - {-|any|all|interface|interface: address|address}

  This column was formerly named DESTINATION.

  Packet Destination.

  Format same as SOURCE column.

PROTO - {-|{any|all|protocol-name|protocol-number|ipp2p[:{udp|all}]}[,...]}

  This column was formerly named PROTOCOL

  A protocol-name (from protocols(5)), a protocol-number, ipp2p, ipp2p:udp or ipp2p:all

  Beginning with Shorewall 4.5.12, this column can accept a comma-separated list of protocols.

DPORT - {-|any|all|ipp2p-option|port-name-or-number[,port-name-or-number]...}

  Destination Port number. Service name from services(5) or port number. May only be specified if the protocol is TCP (6), UDP (17), DCCP (33), SCTP (132) or UDPLITE (136).

  You may place a comma-separated list of port names or numbers in this column if your kernel and iptables include multi-port match support.

  If the PROTOCOL is ipp2p then this column must contain an ipp2p-option ("iptables -m ipp2p --help") without the leading "--". If no option is given in this column, ipp2p is assumed.

  This column was formerly named DEST PORT(S).

SPORT - {-|any|all|port-name-or-number[,port-name-or-number]...}

  Service name from services(5) or port number. May only be specified if the protocol is TCP (6), UDP (17), DCCP (33), SCTP (132) or UDPLITE (136).

  You may place a comma-separated list of port numbers in this column if your kernel and iptables include multi-port match support.

  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 DPORT. Use of '=' requires multi-port match in your iptables and kernel.

  This column was formerly labelled SOURCE PORT(S).

USER - [!][user-name-or-number][:group-name-or-number][+program-name]

  This column was formerly named USER/GROUP and may only be non-empty if the CHAIN is OUTPUT.

  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).

  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

  +upnpd

    #program named upnpd

    ### Important

    The ability to specify a program name was removed from Netfilter in kernel version 2.6.14.

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.

IPSEC - option-list (Optional - Added in Shorewall 4.4.13 but broken until 4.5.4.1 )

  The option-list consists of a comma-separated list of options from the following list. Only packets that will be encrypted or have been decrypted via an SA that matches these options will have their source address changed.

  reqid=number

    where number is specified using setkey(8) using the 'unique:number option for the SPD level.

  spi=<number>

    where number is the SPI of the SA used to encrypt/decrypt packets.

  proto=ah|esp|ipcomp

    IPSEC Encapsulation Protocol

  mss=number

    sets the MSS field in TCP packets

  mode=transport|tunnel

    IPSEC mode

  tunnel-src=address[/mask]

    only available with mode=tunnel

  tunnel-dst=address[/mask]

    only available with mode=tunnel

  strict

    Means that packets must match all rules.

  next

    Separates rules; can only be used with strict

  yes or ipsec

    When used by itself, causes all traffic that will be encrypted/encapsulated or has been decrypted/un-encapsulated to match the rule.

  no or none

    When used by itself, causes all traffic that will not be encrypted/encapsulated or has been decrypted/un-encapsulated to match the rule.

  in

    May only be used in the FORWARD section and must be the first or the only item the list. Indicates that matching packets have been decrypted in input.

  out

    May only be used in the FORWARD section and must be the first or the only item in the list. Indicates that matching packets will be encrypted on output.

  If this column is non-empty and sections are not used, then:

  - A chain NAME appearing in the ACTION column must be a chain branched either directly or indirectly from the accipsecin or accipsecout chain.

  - The CHAIN column must contain either accipsecin or accipsecout or a chain branched either directly or indirectly from those chains.

  - These rules will NOT appear in the accounting chain.

In all of the above columns except ACTION and CHAIN, the values -, any and all may be used as wildcard'gs. Omitted trailing columns are also treated as wildcard'g.

## FILES

/etc/shorewall/accounting

/etc/shorewall6/accounting

## See ALSO

shorewall-logging(5)

https://shorewall.org/configuration_file_basics.htm#Pairs

shorewall(8)