tcfilters - Shorewall u32/basic classifier rules file
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:
Following entries apply to IPv4.
Following entries apply to IPv6
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
The name or number of an interface defined in
shorewall-tcdevices(5) followed by a class number defined for
that interface in shorewall-tcclasses(5).
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). 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) for details.
Destination of the packet. May be a host or
. 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
. 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)
 for details.
You may exclude certain hosts from the set already defined through use of an
Beginning with Shorewall 4.5.12, this column can accept a comma-separated list
Optional destination Ports. A Port name (from
services(5)) or a port number
; if the protocol is icmp
column is interpreted as the destination icmp-type(s).
This column was previously labelled DEST PORT(S).
Optional source port.
This column was previously labelled SOURCE PORT(S).
(Optional) - [-
Specifies the value of the TOS field. The
value can be any of the following:
s must be exactly two digits (e.g., 0x04)x.
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.
Added in Shorewall 4.5.8. Specifies the rule
. 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
The default priority values used by other Shorewall-generated filters are as
•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
Place all 'ping' traffic on interface 1 in
class 10. Note that ALL cannot be used because IPv4 ICMP and IPv6 ICMP are two
#CLASS SOURCE DEST PROTO DPORT
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
1:10 ::/0 ::/0 icmp6 echo-request
1:10 ::/0 ::/0 icmp6 echo-reply
Add two filters with priority 10 (Shorewall
4.5.8 or later).
#CLASS SOURCE DEST PROTO DPORT PRIORITY
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
shorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-ecn(5), shorewall-exclusion(5),
shorewall-hosts(5), shorewall_interfaces(5), shorewall-ipsets(5),
shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5),
shorewall-netmap(5), shorewall-params(5), shorewall-policy(5),
shorewall-providers(5), shorewall-proxyarp(5), shorewall-rtrules(5),
shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)
- shorewall.conf (5)