tcfilters — Shorewall u32/basic classifier rules file
/etc/shorewall[6]/tcfilters
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 specification syntax).
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).
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). 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.
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). 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 exclusion (see shorewall-exclusion(5)).
Protocol.
Beginning with Shorewall 4.5.12, this column can accept a comma-separated list of protocols.
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).
Optional source port.
This column was previously labelled SOURCE PORT(S).
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.
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
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
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-replyAdd 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 10Add 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