You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.8 KiB
80 lines
2.8 KiB
|
|
gact <ACTION> [RAND] [INDEX]
|
|
|
|
Where:
|
|
ACTION := reclassify | drop | continue | pass | ok
|
|
RAND := random <RANDTYPE> <ACTION> <VAL>
|
|
RANDTYPE := netrand | determ
|
|
VAL : = value not exceeding 10000
|
|
INDEX := index value used
|
|
|
|
ACTION semantics
|
|
- pass and ok are equivalent to accept
|
|
- continue allows to restart classification lookup
|
|
- drop drops packets
|
|
- reclassify implies continue classification where we left off
|
|
|
|
randomization
|
|
--------------
|
|
|
|
At the moment there are only two algorithms. One is deterministic
|
|
and the other uses internal kernel netrand.
|
|
|
|
Examples:
|
|
|
|
Rules can be installed on both ingress and egress - this shows ingress
|
|
only
|
|
|
|
tc qdisc add dev eth0 ingress
|
|
|
|
# example 1
|
|
tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src \
|
|
10.0.0.9/32 flowid 1:16 action drop
|
|
|
|
ping -c 20 10.0.0.9
|
|
|
|
--
|
|
filter u32
|
|
filter u32 fh 800: ht divisor 1
|
|
filter u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:16 (rule hit 32 success 20)
|
|
match 0a000009/ffffffff at 12 (success 20 )
|
|
action order 1: gact action drop
|
|
random type none pass val 0
|
|
index 1 ref 1 bind 1 installed 59 sec used 35 sec
|
|
Sent 1680 bytes 20 pkts (dropped 20, overlimits 0 )
|
|
|
|
----
|
|
|
|
# example 2
|
|
#allow 1 out 10 randomly using the netrand generator
|
|
tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src \
|
|
10.0.0.9/32 flowid 1:16 action drop random netrand ok 10
|
|
|
|
ping -c 20 10.0.0.9
|
|
|
|
----
|
|
filter protocol ip pref 6 u32 filter protocol ip pref 6 u32 fh 800: ht divisor 1filter protocol ip pref 6 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:16 (rule hit 20 success 20)
|
|
match 0a000009/ffffffff at 12 (success 20 )
|
|
action order 1: gact action drop
|
|
random type netrand pass val 10
|
|
index 5 ref 1 bind 1 installed 49 sec used 25 sec
|
|
Sent 1680 bytes 20 pkts (dropped 16, overlimits 0 )
|
|
|
|
--------
|
|
#alternative: deterministically accept every second packet
|
|
tc filter add dev eth0 parent ffff: protocol ip prio 6 u32 match ip src \
|
|
10.0.0.9/32 flowid 1:16 action drop random determ ok 2
|
|
|
|
ping -c 20 10.0.0.9
|
|
|
|
tc -s filter show parent ffff: dev eth0
|
|
-----
|
|
filter protocol ip pref 6 u32 filter protocol ip pref 6 u32 fh 800: ht divisor 1filter protocol ip pref 6 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:16 (rule hit 20 success 20)
|
|
match 0a000009/ffffffff at 12 (success 20 )
|
|
action order 1: gact action drop
|
|
random type determ pass val 2
|
|
index 4 ref 1 bind 1 installed 118 sec used 82 sec
|
|
Sent 1680 bytes 20 pkts (dropped 10, overlimits 0 )
|
|
-----
|
|
|