ParseRule.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed ParseRule (int * argcp, char const * argvp [], struct rule * rule, struct cspec * cspec);
     *
     *   rules.h
     *
     *   This module takes an argument vector and an argument count
     *   and fills in a classification rule structure that is suitable for
     *   sending in a VS_CLASSIFICATION MME;
     *
     *   This module is currently used by plcrule and pibruin;
     *
     *
     *   Contributor(s):
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *	Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #include <memory.h>
    #include <errno.h>

    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/error.h"
    #include "../ether/ether.h"
    #include "../plc/rules.h"

    signed ParseRule (int * argcp, char const ** argvp [], struct MMERule * rule, struct cspec * cspec)

    {
    	int argc = * argcp;
    	char const ** argv = * argvp;
    	union
    	{
    		uint32_t wide;
    		uint16_t word;
    		uint8_t byte [4];
    	}
    	temp;
    	signed code;
    	struct MMEClassifier * classifier = (struct MMEClassifier *) (& rule->CLASSIFIER);
    	if ((code = lookup (* argv++, actions, SIZEOF (actions))) == -1)
    	{
    		assist (* -- argv, CLASSIFIER_ACTION_NAME, actions, SIZEOF (actions));
    	}
    	rule->MACTION = (uint8_t) (code);
    	argc--;
    	if ((code = lookup (* argv++, operands, SIZEOF (operands))) == -1)
    	{
    		assist (* -- argv, CLASSIFIER_OPERAND_NAME, operands, SIZEOF (operands));
    	}
    	rule->MOPERAND = (uint8_t) (code);
    	argc--;
    	while ((* argv) && (lookup (* argv, controls, SIZEOF (controls)) == -1))
    	{
    		if ((code = lookup (* argv++, fields, SIZEOF (fields))) == -1)
    		{
    			assist (* -- argv, CLASSIFIER_FIELD_NAME, fields, SIZEOF (fields));
    		}
    		classifier->CR_PID = (uint8_t) (code);
    		argc--;
    		if ((code = lookup (* argv++, operators, SIZEOF (operators))) == -1)
    		{
    			assist (* -- argv, CLASSIFIER_OPERATOR_NAME, operators, SIZEOF (operators));
    		}
    		classifier->CR_OPERAND = (uint8_t) (code);
    		argc--;
    		if (! argc || ! * argv)
    		{
    			error (1, ENOTSUP, "I have %s '%s' but no value", CLASSIFIER_OPERATOR_NAME, * -- argv);
    		}
    		switch (classifier->CR_PID)
    		{
    		case FIELD_ETH_SA:
    		case FIELD_ETH_DA:
    			bytespec (* argv++, classifier->CR_VALUE, ETHER_ADDR_LEN);
    			break;
    		case FIELD_IPV4_SA:
    		case FIELD_IPV4_DA:
    			ipv4spec (* argv++, classifier->CR_VALUE);
    			break;
    		case FIELD_IPV6_SA:
    		case FIELD_IPV6_DA:
    			ipv6spec (* argv++, classifier->CR_VALUE);
    			break;
    		case FIELD_VLAN_UP:
    		case FIELD_IPV6_TC:
    		case FIELD_IPV4_TOS:
    		case FIELD_IPV4_PROT:
    			classifier->CR_VALUE [0] = (uint8_t) (basespec (* argv++, 0, sizeof (classifier->CR_VALUE [0])));
    			break;
    		case FIELD_VLAN_ID:
    		case FIELD_TCP_SP:
    		case FIELD_TCP_DP:
    		case FIELD_UDP_SP:
    		case FIELD_UDP_DP:
    		case FIELD_IP_SP:
    		case FIELD_IP_DP:
    			temp.word = (uint16_t) (basespec (* argv++, 0, sizeof (temp.word)));
    			temp.word = htons (temp.word);
    			memcpy (classifier->CR_VALUE, & temp, sizeof (temp.word));
    			break;
    		case FIELD_ETH_TYPE:
    			temp.word = (uint16_t) (basespec (* argv++, 0, sizeof (temp.word)));
    			temp.word = htons (temp.word);
    			memcpy (classifier->CR_VALUE, & temp, sizeof (temp.word));
    			break;
    		case FIELD_IPV6_FL:
    			temp.wide = (uint32_t) (basespec (* argv++, 0, sizeof (temp.wide))) & 0x000FFFFF;
    			temp.wide = htonl (temp.wide);
    			memcpy (classifier->CR_VALUE, & temp.byte [1], 3);
    			break;
    		case FIELD_HPAV_MME:
    			bytespec (* argv++, classifier->CR_VALUE, sizeof (uint16_t) +  sizeof (uint8_t));
    			temp.byte [0] = classifier->CR_VALUE [1];
    			classifier->CR_VALUE [1] = classifier->CR_VALUE [2];
    			classifier->CR_VALUE [2] = temp.byte [0];
    			break;
    		case FIELD_TCP_ACK:
    			if ((code = lookup (* argv++, states, SIZEOF (states))) == -1)
    			{
    				assist (* -- argv, CLASSIFIER_STATE_NAME, states, SIZEOF (states));
    			}
    			memset (classifier->CR_VALUE, 0, sizeof (classifier->CR_VALUE));
    			break;
    		case FIELD_VLAN_TAG:
    			if ((code = lookup (* argv++, states, SIZEOF (states))) == -1)
    			{
    				assist (* -- argv, CLASSIFIER_STATE_NAME, states, SIZEOF (states));
    			}
    			memset (classifier->CR_VALUE, 0, sizeof (classifier->CR_VALUE));
    			classifier->CR_OPERAND ^= code;
    			break;
    		default:
    			error (1, ENOTSUP, "%s", argv [- 2]);
    			break;
    		}
    		rule->NUM_CLASSIFIERS++;
    		classifier++;
    		argc--;
    	}
    	memcpy (classifier, cspec, sizeof (* cspec));
    	if ((code = lookup (* argv++, controls, SIZEOF (controls))) == -1)
    	{
    		assist (* -- argv, CLASSIFIER_CONTROL_NAME, controls, SIZEOF (controls));
    	}
    	rule->MCONTROL = (uint8_t) (code);
    	argc--;
    	if ((code = lookup (* argv++, volatilities, SIZEOF (volatilities))) == -1)
    	{
    		assist (* -- argv, CLASSIFIER_VOLATILITY_NAME, volatilities, SIZEOF (volatilities));
    	}
    	rule->MVOLATILITY = (uint8_t) (code);
    	argc--;
    	* argcp = argc;
    	* argvp = argv;
    	return (0);
    }

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