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GATE(8) Linux GATE(8)
NAME
gate - Stream Gate Action
SYNOPSIS
tc ... action gate
[ base-time BASETIME ] [ clockid CLOCKID ]
sched-entry <gate state> <interval 1> [ <internal priority> <max octets> ]
sched-entry <gate state> <interval 2> [ <internal priority> <max octets> ]
sched-entry <gate state> <interval 3> [ <internal priority> <max octets> ]
......
sched-entry <gate state> <interval N> [ <internal priority> <max octets> ]
DESCRIPTION
GATE action allows specified ingress frames can be passed at specific time slot, or be
dropped at specific time slot. Tc filter filters the ingress frames, then tc gate action
would specify which time slot and how many bytes these frames can be passed to device and
which time slot frames would be dropped. Gate action also assign a base-time to tell when
the entry list start. Then gate action would start to repeat the gate entry list cycli-
cally at the start base-time. For the software simulation, gate action requires the user
assign reference time clock type.
PARAMETERS
base-time
Specifies the instant in nanoseconds, defining the time when the schedule starts.
If 'base-time' is a time in the past, the schedule will start at
base-time + (N * cycle-time)
where N is the smallest integer so the resulting time is greater than "now", and
"cycle-time" is the sum of all the intervals of the entries in the schedule. With-
out base-time specified, will default to be 0.
clockid
Specifies the clock to be used by qdisc's internal timer for measuring time and
scheduling events. Not valid if gate action is used for offloading filter. For ex-
ample, tc filter command with skip_sw parameter.
sched-entry
There may multiple sched-entry parameters in a single schedule. Each one has the
format:
sched-entry <gate state> <interval> [ <internal priority> <max octets> ]
<gate state> means gate states. 'open' keep gate open, 'close' keep gate close.
<interval> means how much nano seconds for this time slot.
<internal priority> means internal priority value. Present of the internal receiv-
ing queue for this stream. "-1" means wildcard. <internal priority> and <max
octets> can be omit default to be "-1" which both
value to be "-1" for this <sched-entry>.
<max octets> means how many octets size could pass in this time slot. Dropped if
overlimited. "-1" means wildcard. <max octets> can be omit default to be "-1" which
value to be "-1" for this <sched-entry>.
Note that <internal priority> and <max octets> are nothing meaning for gate state
is "close" in a "sched-entry". All frames are dropped when "sched-entry" with
"close" state.
EXAMPLES
The following example shows tc filter frames source ip match to the 192.168.0.20 will keep
the gate open for 200ms and limit the traffic to 8MB in this sched-entry. Then keep the
traffic gate to be close for 100ms. Frames arrived at gate close state would be dropped.
Then the cycle would run the gate entries periodically. The schedule will start at instant
200.0s using the reference CLOCK_TAI. The schedule is composed of two entries each of
300ms duration.
# tc qdisc add dev eth0 ingress
# tc filter add dev eth0 parent ffff: protocol ip \
flower skip_hw src_ip 192.168.0.20 \
action gate index 2 clockid CLOCK_TAI \
base-time 200000000000ns \
sched-entry open 200000000ns -1 8000000b \
sched-entry close 100000000ns
Following commands is an example to filter a stream source mac match to the
10:00:80:00:00:00 icmp frames will be dropped at any time with cycle 200ms. With a de-
fault basetime 0 and clockid is CLOCK_TAI as default.
# tc qdisc add dev eth0 ingress
# tc filter add dev eth0 parent ffff: protocol ip \
flower ip_proto icmp dst_mac 10:00:80:00:00:00 \
action gate index 12 sched-entry close 200000000ns
AUTHORS
Po Liu <Po.Liu AT nxp.com>
iproute2 12 Mar 2020 GATE(8)
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On Apache
Under GNU General Public License
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