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security_classes

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  • asn1_ber_bytecode.h 2.53 KiB
    /* ASN.1 BER/DER/CER parsing state machine internal definitions
     *
     * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
     * Written by David Howells (dhowells@redhat.com)
     *
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public Licence
     * as published by the Free Software Foundation; either version
     * 2 of the Licence, or (at your option) any later version.
     */
    
    #ifndef _LINUX_ASN1_BER_BYTECODE_H
    #define _LINUX_ASN1_BER_BYTECODE_H
    
    #ifdef __KERNEL__
    #include <linux/types.h>
    #endif
    #include <linux/asn1.h>
    
    typedef int (*asn1_action_t)(void *context,
    			     size_t hdrlen, /* In case of ANY type */
    			     unsigned char tag, /* In case of ANY type */
    			     const void *value, size_t vlen);
    
    struct asn1_decoder {
    	const unsigned char *machine;
    	size_t machlen;
    	const asn1_action_t *actions;
    };
    
    enum asn1_opcode {
    	/* The tag-matching ops come first and the odd-numbered slots
    	 * are for OR_SKIP ops.
    	 */
    #define ASN1_OP_MATCH__SKIP		  0x01
    #define ASN1_OP_MATCH__ACT		  0x02
    #define ASN1_OP_MATCH__JUMP		  0x04
    #define ASN1_OP_MATCH__ANY		  0x08
    #define ASN1_OP_MATCH__COND		  0x10
    
    	ASN1_OP_MATCH			= 0x00,
    	ASN1_OP_MATCH_OR_SKIP		= 0x01,
    	ASN1_OP_MATCH_ACT		= 0x02,
    	ASN1_OP_MATCH_ACT_OR_SKIP	= 0x03,
    	ASN1_OP_MATCH_JUMP		= 0x04,
    	ASN1_OP_MATCH_JUMP_OR_SKIP	= 0x05,
    	ASN1_OP_MATCH_ANY		= 0x08,
    	ASN1_OP_MATCH_ANY_ACT		= 0x0a,
    	/* Everything before here matches unconditionally */
    
    	ASN1_OP_COND_MATCH_OR_SKIP	= 0x11,
    	ASN1_OP_COND_MATCH_ACT_OR_SKIP	= 0x13,
    	ASN1_OP_COND_MATCH_JUMP_OR_SKIP	= 0x15,
    	ASN1_OP_COND_MATCH_ANY		= 0x18,
    	ASN1_OP_COND_MATCH_ANY_ACT	= 0x1a,
    
    	/* Everything before here will want a tag from the data */
    #define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT
    
    	/* These are here to help fill up space */
    	ASN1_OP_COND_FAIL		= 0x1b,
    	ASN1_OP_COMPLETE		= 0x1c,
    	ASN1_OP_ACT			= 0x1d,
    	ASN1_OP_RETURN			= 0x1e,
    
    	/* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
    	ASN1_OP_END_SEQ			= 0x20,
    	ASN1_OP_END_SET			= 0x21,
    	ASN1_OP_END_SEQ_OF		= 0x22,
    	ASN1_OP_END_SET_OF		= 0x23,
    	ASN1_OP_END_SEQ_ACT		= 0x24,
    	ASN1_OP_END_SET_ACT		= 0x25,
    	ASN1_OP_END_SEQ_OF_ACT		= 0x26,
    	ASN1_OP_END_SET_OF_ACT		= 0x27,
    #define ASN1_OP_END__SET		  0x01
    #define ASN1_OP_END__OF			  0x02
    #define ASN1_OP_END__ACT		  0x04
    
    	ASN1_OP__NR
    };
    
    #define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
    #define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
    #define _jump_target(N) (N)
    #define _action(N) (N)
    
    #endif /* _LINUX_ASN1_BER_BYTECODE_H */