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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Interface for a module to parse TCP/IP packets.
*/
#ifndef __PACKET_PARSER_H__
#define __PACKET_PARSER_H__
#include "packet.h"
/* What layer of headers is at the head of the packet? */
enum packet_layer_t {
PACKET_LAYER_3_IP = 0, /* no layer 2 headers */
PACKET_LAYER_2_ETHERNET, /* layer 2 is Ethernet */
};
enum packet_parse_result_t {
PACKET_OK, /* no errors detected */
PACKET_BAD, /* illegal header */
PACKET_UNKNOWN_L4, /* not TCP or UDP */
};
/* Given an input packet of length 'in_bytes' stored in the buffer
* whose location is given by the packet's 'buffer' field and whose
* full size is given by the 'buffer_bytes' field, parses the packets
* and fills in packet fields 'ip_bytes', 'ip', and 'tcp'. On success,
* returns PACKET_OK; on error, returns a enum packet_parse_result_t error
* code and fills in *error with a human-readable, malloc-allocated
* error message.
*/
int parse_packet(struct packet *packet, int in_bytes,
enum packet_layer_t layer, char **error);
#endif /* __PACKET_PARSER_H__ */
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