include/linux/asn1_ber_bytecode.h

   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
  20 typedef 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
  25 struct asn1_decoder {
  26         const unsigned char *machine;
  27         size_t machlen;
  28         const asn1_action_t *actions;
  29 };
  30
  31 enum 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 */