Provided by: shorewall_5.2.8-6_all 
NAME
tcfilters - Shorewall u32/basic classifier rules file
SYNOPSIS
/etc/shorewall[6]/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|+ipset}
Source of the packet. May be a host or network address. DNS names are not allowed. Beginning with
Shorewall 4.6.0, an ipset name (prefixed with '+') may be used if your kernel and ip6tables have the
Basic Ematch capability and you set BASIC_FILTERS=Yes in shorewall.conf (5)[3]. The ipset name may
optionally be followed by a number or a comma separated list of src and/or dst enclosed in square
brackets ([...]). See shorewall-ipsets(5)[4] for details.
DEST - {-|address|+ipset}
Destination of the packet. May be a host or network address. DNS names are not allowed. Beginning
with Shorewall 4.6.0, an ipset name (prefixed with '+') may be used if your kernel and ip6tables have
the Basic Ematch capability and you set BASIC_FILTERS=Yes in shorewall.conf (5)[3]. The ipset name
may optionally be followed by a number or a comma separated list of src and/or dst enclosed in square
brackets ([...]). See shorewall-ipsets(5)[4] for details.
You may exclude certain hosts from the set already defined through use of an exclusion (see
shorewall-exclusion[5](5)).
PROTO - {-|{protocol-number|protocol-name|all}[,...]}
Protocol.
Beginning with Shorewall 4.5.12, this column can accept a comma-separated list of protocols.
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).
This column was previously labelled DEST PORT(S).
SPORT - [-|port-name-or-number]
Optional source port.
This column was previously labelled SOURCE PORT(S).
TOS (Optional) - [-|tos]
Specifies the value of the TOS field. The tos value can be any of the following:
• tos-minimize-delay
• tos-maximize-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.
PRIORITY - [-|priority]
Added in Shorewall 4.5.8. Specifies the rule priority. The priority value must be > 0 and <= 65535.
When a priority is not given:
• For Shorewall versions prior to 4.5.8 - all filters have priority 10.
• For Shorewall 4.5.8 and later - for each device, the compiler maintains a high-water priority
with an initial value of 0. When a filter has no priority, the high-water priority is incremented
by 1 and assigned to the filter. When a priority greater than the high-water priority is entered
in this column, the high-water priority is set to the specified priority. An attempt to assign a
priority value greater than 65535 (explicitly or implicitly) raises an error.
The default priority values used by other Shorewall-generated filters are as follows:
• Classify by packet mark - ( class priority << 8 ) | 20.
• Ingress policing - 10
• Simple TC ACK packets - 1
• Complex TC ACK packets - ( class priority << 8 ) | 10.
• Classify by TOS - ( class priority << 8 ) | 15.
• Class with 'occurs' - 65535
EXAMPLE
IPv4 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 DPORT
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
IPv4 Example 2:
Add two filters with priority 10 (Shorewall 4.5.8 or later).
#CLASS SOURCE DEST PROTO DPORT PRIORITY
IPV4
1:10 0.0.0.0/0 0.0.0.0/0 icmp echo-request 10
1:10 0.0.0.0/0 0.0.0.0/0 icmp echo-reply 10
IPv6 Example 1:
Add two filters with priority 10 (Shorewall 4.5.8 or later).
#CLASS SOURCE DEST PROTO DPORT PRIORITY
IPV6
1:10 ::/0 ::/0 icmp echo-request 10
1:10 ::/0 ::/0 icmp echo-reply 10
FILES
/etc/shorewall/tcfilters
/etc/shorewall6/tcfilters
SEE ALSO
https://shorewall.org/traffic_shaping.htm[6]
https://shorewall.org/MultiISP.html[7]
https://shorewall.org/PacketMarking.html[8]
https://shorewall.org/configuration_file_basics.htm#Pairs[9]
shorewall(8)
NOTES
1. shorewall-tcdevices
https://shorewall.org/manpages/shorewall-tcdevices.html
2. shorewall-tcclasses
https://shorewall.org/manpages/shorewall-tcclasses.html
3. shorewall.conf (5)
https://shorewall.org/manpages/shorewall.conf.html
4. shorewall-ipsets(5)
https://shorewall.org/manpages/shorewall-ipsets.html
5. shorewall-exclusion
https://shorewall.org/manpages/shorewall-exclusion.html
6. https://shorewall.org/traffic_shaping.htm
https://shorewall.org/traffic_shaping.htm
7. https://shorewall.org/MultiISP.html
https://shorewall.org/MultiISP.html
8. https://shorewall.org/PacketMarking.html
https://shorewall.org/PacketMarking.html
9. https://shorewall.org/configuration_file_basics.htm#Pairs
https://shorewall.org/configuration_file_basics.htm#Pairs
Configuration Files 09/24/2020 SHOREWALL-TCFILTERS(5)