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