88 lines
2.5 KiB
C
Executable File
88 lines
2.5 KiB
C
Executable File
/*
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* Copyright (c) 1991 by Sun Microsystems, Inc.
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*/
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#ifndef _SYS_PFMOD_H
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#define _SYS_PFMOD_H
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#pragma ident "@(#)pfmod.h 1.4 93/02/04 SMI"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Ioctls.
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*/
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#define PFIOC ('P' << 8)
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#define PFIOCSETF (PFIOC|1) /* replace current packet filter */
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#define ENMAXFILTERS 255 /* maximum filter short words */
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/*
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* filter structure for SETF
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*/
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struct packetfilt {
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u_char Pf_Priority; /* priority of filter */
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u_char Pf_FilterLen; /* length of filter cmd list */
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u_short Pf_Filter[ENMAXFILTERS]; /* filter command list */
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};
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/*
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* We now allow specification of up to MAXFILTERS (short) words of a filter
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* command list to be applied to incoming packets to determine if
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* those packets should be given to a particular open ethernet file.
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*
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* In this context, "word" means a short (16-bit) integer.
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*
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* Each open enet file specifies the filter command list via ioctl.
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* Each filter command list specifies a sequence of actions that leaves a
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* boolean value on the top of an internal stack. Each word of the
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* command list specifies an action from the set {PUSHLIT, PUSHZERO,
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* PUSHWORD+N} which respectively push the next word of the filter, zero,
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* or word N of the incoming packet on the stack, and a binary operator
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* from the set {EQ, LT, LE, GT, GE, AND, OR, XOR} which operates on the
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* top two elements of the stack and replaces them with its result. The
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* special action NOPUSH and the special operator NOP can be used to only
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* perform the binary operation or to only push a value on the stack.
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*
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* If the final value of the filter operation is true, then the packet is
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* accepted for the open file which specified the filter.
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*/
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/* these must sum to sizeof (u_short)! */
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#define ENF_NBPA 10 /* # bits / action */
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#define ENF_NBPO 6 /* # bits / operator */
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/* binary operators */
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#define ENF_NOP (0 << ENF_NBPA)
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#define ENF_EQ (1 << ENF_NBPA)
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#define ENF_LT (2 << ENF_NBPA)
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#define ENF_LE (3 << ENF_NBPA)
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#define ENF_GT (4 << ENF_NBPA)
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#define ENF_GE (5 << ENF_NBPA)
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#define ENF_AND (6 << ENF_NBPA)
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#define ENF_OR (7 << ENF_NBPA)
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#define ENF_XOR (8 << ENF_NBPA)
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#define ENF_COR (9 << ENF_NBPA)
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#define ENF_CAND (10 << ENF_NBPA)
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#define ENF_CNOR (11 << ENF_NBPA)
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#define ENF_CNAND (12 << ENF_NBPA)
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#define ENF_NEQ (13 << ENF_NBPA)
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/* stack actions */
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#define ENF_NOPUSH 0
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#define ENF_PUSHLIT 1
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#define ENF_PUSHZERO 2
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#define ENF_PUSHONE 3
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#define ENF_PUSHFFFF 4
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#define ENF_PUSHFF00 5
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#define ENF_PUSH00FF 6
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#define ENF_PUSHWORD 16
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_PFMOD_H */
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