All possible combinations problem Post: 302961606

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Top Forums Shell Programming and Scripting All possible combinations problem Post 302961606 by RudiC on Tuesday 1st of December 2015 03:33:51 PM

Old

12-01-2015

Registered User

Checking for a set bit outside a "mask" value can be easily done with "binary" operations; unfortunately, awk doesn't allow for this, afaik. bash can do it:

Code:

V1=$((2#1))
V8=$((2#01000))
MASK=$((2#11100))
echo $MASK
28
echo $((V1 | MASK))
29
echo $((V8 | MASK))
28
echo $(((V8 | MASK) == MASK))
1
echo $(((V1 | MASK) == MASK))
0

You see that bit0 is NOT in MASK, but bit7 is.

RudiC

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tc-tcindex

Traffic control index filter(8) 				       Linux					   Traffic control index filter(8)

NAME

       tcindex - traffic control index filter

SYNOPSIS

       tc filter ... tcindex [ hash SIZE ] [ mask MASK ] [ shift SHIFT ] [ pass_on | fall_through ] [ classid CLASSID ] [ action ACTION_SPEC ]

DESCRIPTION

       This  filter allows to match packets based on their tcindex field value, i.e. the combination of the DSCP and ECN fields as present in IPv4
       and IPv6 headers.

OPTIONS

       action ACTION_SPEC
	      Apply an action from the generic actions framework on matching packets.

       classid CLASSID
	      Push matching packets into the class identified by CLASSID.

       hash SIZE
	      Hash table size in entries to use. Defaults to 64.

       mask MASK
	      An optional bitmask to binary AND to the packet's tcindex field before use.

       shift SHIFT
	      The number of bits to right-shift a packet's tcindex value before use. If a mask has been set, masking is done before shifting.

       pass_on
	      If this flag is set, failure to find a class for the resulting ID will make the filter fail and lead to the next filter  being  con-
	      sulted.

       fall_through
	      This  is	the  opposite  of  pass_on  and the default. The filter will classify the packet even if there is no class present for the
	      resulting class ID.

SEE ALSO

       tc(8)

iproute2							    21 Oct 2015 				   Traffic control index filter(8)