linux/include/linux/asn1_ber_bytecode.h
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   1/* ASN.1 BER/DER/CER parsing state machine internal definitions
   2 *
   3 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11
  12#ifndef _LINUX_ASN1_BER_BYTECODE_H
  13#define _LINUX_ASN1_BER_BYTECODE_H
  14
  15#ifdef __KERNEL__
  16#include <linux/types.h>
  17#endif
  18#include <linux/asn1.h>
  19
  20typedef int (*asn1_action_t)(void *context,
  21                             size_t hdrlen, /* In case of ANY type */
  22                             unsigned char tag, /* In case of ANY type */
  23                             const void *value, size_t vlen);
  24
  25struct asn1_decoder {
  26        const unsigned char *machine;
  27        size_t machlen;
  28        const asn1_action_t *actions;
  29};
  30
  31enum asn1_opcode {
  32        /* The tag-matching ops come first and the odd-numbered slots
  33         * are for OR_SKIP ops.
  34         */
  35#define ASN1_OP_MATCH__SKIP               0x01
  36#define ASN1_OP_MATCH__ACT                0x02
  37#define ASN1_OP_MATCH__JUMP               0x04
  38#define ASN1_OP_MATCH__ANY                0x08
  39#define ASN1_OP_MATCH__COND               0x10
  40
  41        ASN1_OP_MATCH                   = 0x00,
  42        ASN1_OP_MATCH_OR_SKIP           = 0x01,
  43        ASN1_OP_MATCH_ACT               = 0x02,
  44        ASN1_OP_MATCH_ACT_OR_SKIP       = 0x03,
  45        ASN1_OP_MATCH_JUMP              = 0x04,
  46        ASN1_OP_MATCH_JUMP_OR_SKIP      = 0x05,
  47        ASN1_OP_MATCH_ANY               = 0x08,
  48        ASN1_OP_MATCH_ANY_ACT           = 0x0a,
  49        /* Everything before here matches unconditionally */
  50
  51        ASN1_OP_COND_MATCH_OR_SKIP      = 0x11,
  52        ASN1_OP_COND_MATCH_ACT_OR_SKIP  = 0x13,
  53        ASN1_OP_COND_MATCH_JUMP_OR_SKIP = 0x15,
  54        ASN1_OP_COND_MATCH_ANY          = 0x18,
  55        ASN1_OP_COND_MATCH_ANY_ACT      = 0x1a,
  56
  57        /* Everything before here will want a tag from the data */
  58#define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT
  59
  60        /* These are here to help fill up space */
  61        ASN1_OP_COND_FAIL               = 0x1b,
  62        ASN1_OP_COMPLETE                = 0x1c,
  63        ASN1_OP_ACT                     = 0x1d,
  64        ASN1_OP_RETURN                  = 0x1e,
  65
  66        /* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
  67        ASN1_OP_END_SEQ                 = 0x20,
  68        ASN1_OP_END_SET                 = 0x21,
  69        ASN1_OP_END_SEQ_OF              = 0x22,
  70        ASN1_OP_END_SET_OF              = 0x23,
  71        ASN1_OP_END_SEQ_ACT             = 0x24,
  72        ASN1_OP_END_SET_ACT             = 0x25,
  73        ASN1_OP_END_SEQ_OF_ACT          = 0x26,
  74        ASN1_OP_END_SET_OF_ACT          = 0x27,
  75#define ASN1_OP_END__SET                  0x01
  76#define ASN1_OP_END__OF                   0x02
  77#define ASN1_OP_END__ACT                  0x04
  78
  79        ASN1_OP__NR
  80};
  81
  82#define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
  83#define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
  84#define _jump_target(N) (N)
  85#define _action(N) (N)
  86
  87#endif /* _LINUX_ASN1_BER_BYTECODE_H */
  88
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