NAME¶

tcfilters - Shorewall u32 classifier rules file

SYNOPSIS¶

/etc/shorewall/tcfilters

DESCRIPTION¶

Entries in this file cause packets to be classified for traffic shaping.

Beginning with Shorewall 4.4.15, the file may contain entries for both IPv4 and IPv6. By default, all rules apply to IPv4 but that can be changed by inserting a line as follows:

IPV4

Following entries apply to IPv4.

IPV6

Following entries apply to IPv6

ALL

Following entries apply to both IPv4 and IPv6. Each entry is processed twice; once for IPv4 and once for IPv6.

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).

CLASS - interface:class

The name or number of an interface defined in shorewall-tcdevices[1](5) followed by a class number defined for that interface in shorewall-tcclasses[2](5).

SOURCE - {-|address}

Source of the packet. May be a host or network address. DNS names are not allowed.

DEST - {-|address}}

Destination of the packet. May be a host or network address. DNS names are not allowed.

You may exclude certain hosts from the set already defined through use of an exclusion (see shorewall-exclusion[3](5)).

PROTO - {-|protocol-number|protocol-name|all}

Protocol.

DEST PORT (dport) - [-|port-name-or-number]

Optional destination Ports. A Port name (from services(5)) or a port number; if the protocol is icmp, this column is interpreted as the destination icmp-type(s).

SOURCE PORT (sport) - [-|port-name-or-number]

Optional source port.

TOS (Optional) - [-|tos]

Specifies the value of the TOS field. The tos value can be any of the following:

•tos-minimize-delay

•tos-maximuze-throughput

•tos-maximize-reliability

•tos-minimize-cost

•tos-normal-service

•hex-number

•hex-number/hex-number

The hex-numbers must be exactly two digits (e.g., 0x04)x.

LENGTH - [-|number]

Optional - Must be a power of 2 between 32 and 8192 inclusive. Packets with a total length that is strictly less than the specified number will match the rule.

EXAMPLE¶

Example 1:

Place all 'ping' traffic on interface 1 in class 10. Note that ALL cannot be used because IPv4 ICMP and IPv6 ICMP are two different protocols.

       #CLASS    SOURCE    DEST         PROTO   DEST
       #                                        PORT

       IPV4

       1:10      0.0.0.0/0 0.0.0.0/0    icmp    echo-request
       1:10      0.0.0.0/0 0.0.0.0/0    icmp    echo-reply

       IPV6

       1:10      ::/0      ::/0         icmp6   echo-request
       1:10      ::/0      ::/0         icmp6   echo-reply