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Annotation of embedaddon/strongswan/src/libstrongswan/networking/packet.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2012 Tobias Brunner
        !             3:  * Copyright (C) 2005-2006 Martin Willi
        !             4:  * Copyright (C) 2005 Jan Hutter
        !             5:  * HSR Hochschule fuer Technik Rapperswil
        !             6:  *
        !             7:  * This program is free software; you can redistribute it and/or modify it
        !             8:  * under the terms of the GNU General Public License as published by the
        !             9:  * Free Software Foundation; either version 2 of the License, or (at your
        !            10:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !            11:  *
        !            12:  * This program is distributed in the hope that it will be useful, but
        !            13:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            15:  * for more details.
        !            16:  */
        !            17: 
        !            18: #include "packet.h"
        !            19: 
        !            20: typedef struct private_packet_t private_packet_t;
        !            21: 
        !            22: /**
        !            23:  * Private data of an packet_t object.
        !            24:  */
        !            25: struct private_packet_t {
        !            26: 
        !            27:        /**
        !            28:         * Public part of a packet_t object.
        !            29:         */
        !            30:        packet_t public;
        !            31: 
        !            32:        /**
        !            33:         * source address
        !            34:         */
        !            35:        host_t *source;
        !            36: 
        !            37:        /**
        !            38:         * destination address
        !            39:         */
        !            40:        host_t *destination;
        !            41: 
        !            42:        /**
        !            43:         * DSCP value on packet
        !            44:         */
        !            45:        uint8_t dscp;
        !            46: 
        !            47:         /**
        !            48:          * message data
        !            49:          */
        !            50:        chunk_t data;
        !            51: 
        !            52:        /**
        !            53:         * actual chunk returned from get_data, adjusted when skip_bytes is called
        !            54:         */
        !            55:        chunk_t adjusted_data;
        !            56: };
        !            57: 
        !            58: METHOD(packet_t, set_source, void,
        !            59:        private_packet_t *this, host_t *source)
        !            60: {
        !            61:        DESTROY_IF(this->source);
        !            62:        this->source = source;
        !            63: }
        !            64: 
        !            65: METHOD(packet_t, set_destination, void,
        !            66:        private_packet_t *this, host_t *destination)
        !            67: {
        !            68:        DESTROY_IF(this->destination);
        !            69:        this->destination = destination;
        !            70: }
        !            71: 
        !            72: METHOD(packet_t, get_source, host_t*,
        !            73:        private_packet_t *this)
        !            74: {
        !            75:        return this->source;
        !            76: }
        !            77: 
        !            78: METHOD(packet_t, get_destination, host_t*,
        !            79:        private_packet_t *this)
        !            80: {
        !            81:        return this->destination;
        !            82: }
        !            83: 
        !            84: METHOD(packet_t, get_data, chunk_t,
        !            85:        private_packet_t *this)
        !            86: {
        !            87:        return this->adjusted_data;
        !            88: }
        !            89: 
        !            90: METHOD(packet_t, set_data, void,
        !            91:        private_packet_t *this, chunk_t data)
        !            92: {
        !            93:        free(this->data.ptr);
        !            94:        this->adjusted_data = this->data = data;
        !            95: }
        !            96: 
        !            97: METHOD(packet_t, get_dscp, uint8_t,
        !            98:        private_packet_t *this)
        !            99: {
        !           100:        return this->dscp;
        !           101: }
        !           102: METHOD(packet_t, set_dscp, void,
        !           103:        private_packet_t *this, uint8_t value)
        !           104: {
        !           105:        this->dscp = value;
        !           106: }
        !           107: 
        !           108: METHOD(packet_t, skip_bytes, void,
        !           109:        private_packet_t *this, size_t bytes)
        !           110: {
        !           111:        this->adjusted_data = chunk_skip(this->adjusted_data, bytes);
        !           112: }
        !           113: 
        !           114: METHOD(packet_t, destroy, void,
        !           115:        private_packet_t *this)
        !           116: {
        !           117:        DESTROY_IF(this->source);
        !           118:        DESTROY_IF(this->destination);
        !           119:        free(this->data.ptr);
        !           120:        free(this);
        !           121: }
        !           122: 
        !           123: METHOD(packet_t, clone_, packet_t*,
        !           124:        private_packet_t *this)
        !           125: {
        !           126:        packet_t *other;
        !           127: 
        !           128:        other = packet_create();
        !           129:        if (this->destination)
        !           130:        {
        !           131:                other->set_destination(other,
        !           132:                                                           this->destination->clone(this->destination));
        !           133:        }
        !           134:        if (this->source)
        !           135:        {
        !           136:                other->set_source(other, this->source->clone(this->source));
        !           137:        }
        !           138:        if (this->data.ptr)
        !           139:        {
        !           140:                other->set_data(other, chunk_clone(this->adjusted_data));
        !           141:        }
        !           142:        other->set_dscp(other, this->dscp);
        !           143:        return other;
        !           144: }
        !           145: 
        !           146: /**
        !           147:  * Described in header.
        !           148:  */
        !           149: packet_t *packet_create_from_data(host_t *src, host_t *dst, chunk_t data)
        !           150: {
        !           151:        private_packet_t *this;
        !           152: 
        !           153:        INIT(this,
        !           154:                .public = {
        !           155:                        .set_data = _set_data,
        !           156:                        .get_data = _get_data,
        !           157:                        .set_source = _set_source,
        !           158:                        .get_source = _get_source,
        !           159:                        .set_destination = _set_destination,
        !           160:                        .get_destination = _get_destination,
        !           161:                        .get_dscp = _get_dscp,
        !           162:                        .set_dscp = _set_dscp,
        !           163:                        .skip_bytes = _skip_bytes,
        !           164:                        .clone = _clone_,
        !           165:                        .destroy = _destroy,
        !           166:                },
        !           167:                .source = src,
        !           168:                .destination = dst,
        !           169:                .adjusted_data = data,
        !           170:                .data = data,
        !           171:        );
        !           172: 
        !           173:        return &this->public;
        !           174: }
        !           175: 
        !           176: /*
        !           177:  * Described in header.
        !           178:  */
        !           179: packet_t *packet_create()
        !           180: {
        !           181:        return packet_create_from_data(NULL, NULL, chunk_empty);
        !           182: }