LXR linux/include/linux/asn1_ber

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* ASN.1 BER/DER/CER parsing state machine internal definitions
   3 *
   4 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 */
   7
   8#ifndef _LINUX_ASN1_BER_BYTECODE_H
   9#define _LINUX_ASN1_BER_BYTECODE_H
  10
  11#ifdef __KERNEL__
  12#include <linux/types.h>
  13#endif
  14#include <linux/asn1.h>
  15
  16typedef int (*asn1_action_t)(void *context,
  17                             size_t hdrlen, /* In case of ANY type */
  18                             unsigned char tag, /* In case of ANY type */
  19                             const void *value, size_t vlen);
  20
  21struct asn1_decoder {
  22        const unsigned char *machine;
  23        size_t machlen;
  24        const asn1_action_t *actions;
  25};
  26
  27enum asn1_opcode {
  28        /* The tag-matching ops come first and the odd-numbered slots
  29         * are for OR_SKIP ops.
  30         */
  31#define ASN1_OP_MATCH__SKIP               0x01
  32#define ASN1_OP_MATCH__ACT                0x02
  33#define ASN1_OP_MATCH__JUMP               0x04
  34#define ASN1_OP_MATCH__ANY                0x08
  35#define ASN1_OP_MATCH__COND               0x10
  36
  37        ASN1_OP_MATCH                   = 0x00,
  38        ASN1_OP_MATCH_OR_SKIP           = 0x01,
  39        ASN1_OP_MATCH_ACT               = 0x02,
  40        ASN1_OP_MATCH_ACT_OR_SKIP       = 0x03,
  41        ASN1_OP_MATCH_JUMP              = 0x04,
  42        ASN1_OP_MATCH_JUMP_OR_SKIP      = 0x05,
  43        ASN1_OP_MATCH_ANY               = 0x08,
  44        ASN1_OP_MATCH_ANY_OR_SKIP       = 0x09,
  45        ASN1_OP_MATCH_ANY_ACT           = 0x0a,
  46        ASN1_OP_MATCH_ANY_ACT_OR_SKIP   = 0x0b,
  47        /* Everything before here matches unconditionally */
  48
  49        ASN1_OP_COND_MATCH_OR_SKIP      = 0x11,
  50        ASN1_OP_COND_MATCH_ACT_OR_SKIP  = 0x13,
  51        ASN1_OP_COND_MATCH_JUMP_OR_SKIP = 0x15,
  52        ASN1_OP_COND_MATCH_ANY          = 0x18,
  53        ASN1_OP_COND_MATCH_ANY_OR_SKIP  = 0x19,
  54        ASN1_OP_COND_MATCH_ANY_ACT      = 0x1a,
  55        ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP = 0x1b,
  56
  57        /* Everything before here will want a tag from the data */
  58#define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP
  59
  60        /* These are here to help fill up space */
  61        ASN1_OP_COND_FAIL               = 0x1c,
  62        ASN1_OP_COMPLETE                = 0x1d,
  63        ASN1_OP_ACT                     = 0x1e,
  64        ASN1_OP_MAYBE_ACT               = 0x1f,
  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_RETURN                  = 0x28,
  80
  81        ASN1_OP__NR
  82};
  83
  84#define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
  85#define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
  86#define _jump_target(N) (N)
  87#define _action(N) (N)
  88
  89#endif /* _LINUX_ASN1_BER_BYTECODE_H */
  90