sk_chk_filter man page on Scientific

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SK_CHK_FILTER(9)	       Linux Networking		      SK_CHK_FILTER(9)

NAME
       sk_chk_filter - verify socket filter code

SYNOPSIS
       int sk_chk_filter(struct sock_filter * filter, int flen);

ARGUMENTS
       filter
	   filter to verify

       flen
	   length of filter

DESCRIPTION
       Check the userĀ“s filter code. If we let some ugly filter code slip
       through kaboom! The filter must contain no references or jumps that are
       out of range, no illegal instructions, and must end with a RET
       instruction.

       All jumps are forward as they are not signed.

       Returns 0 if the rule set is legal or -EINVAL if not.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		      SK_CHK_FILTER(9)
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