Wiesner András
8ed6bc57ad
- TCP client/server initial implementation - TCPWindow reworked, now without MP
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
#ifndef ETHERLIB_TCP_SEGMENT_H
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#define ETHERLIB_TCP_SEGMENT_H
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#include <stdint.h>
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#include "../../packet_sieve.h"
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#define ETH_TCP_PACKET_CLASS (6)
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#define ETH_TCP_HEADER_SIZE (20)
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#define TCP_MAX_OPT_VAL_LEN (8)
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/**
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* TCP option kinds.
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*/
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typedef enum {
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TCP_OPT_KIND_EOL = 0, // End of Operation List Option
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TCP_OPT_KIND_NOP = 1, // No-Operation
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TCP_OPT_KIND_MSS = 2 // Maximum Segment Size
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} TcpOptionKind;
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/**
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* TCP options
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*/
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typedef struct TcpOption_ {
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uint8_t kind; ///< Kind of the specific option (~type)
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uint8_t size; ///< Size of value (NOT including 'kind' and 'length' fields) [=TCP opt length - 2]
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struct TcpOption_ * next; ///< Next option in the list
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uint8_t value[]; ///< Value
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} TcpOption;
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/**
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* Allocate new TCP option.
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* @param kind kind of TCP option.
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* @param size size of value
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* @return pointer to newly allocated option
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*/
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TcpOption * tcpopt_new(uint32_t kind, uint32_t size);
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/**
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* TCP segment properties.
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*/
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typedef struct {
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PcktPropsHeader
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uint16_t SourcePort; ///< Source port
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uint16_t DestinationPort; ///< Destination port
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uint32_t SequenceNumber; ///< TCP sequence number
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uint32_t AcknowledgementNumber; ///< TCP ack. number
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uint8_t DataOffset; ///< Data offset in 32-bits (4 bit-long field)
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uint16_t Flags; ///< TCP flags (9-bit, 8 + 4, but upper 3 is reserved)
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uint16_t Window; ///< TCP window
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uint16_t Checksum; ///< Checksum
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uint16_t UrgentPtr; ///< Urgent pointer
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TcpOption * options; ///< Linked list of TCP options
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} TcpProps;
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struct EthInterface_;
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/**
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* Parse raw TCP segments.
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* @param hdr pointer to the TCP packet header
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* @param size total packet size
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* @param pcktHdrLe pointer to property storage
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* @return 0 on success or -1 on failure
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*/
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int parse_tcp(const uint8_t *hdr, uint32_t size, PcktHeaderElement *pcktHdrLe, struct EthInterface_ *intf, PcktProcFnPassbackData *pb);
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/**
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* Insert TCP header.
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* @param hdr space where the header is to be inserted
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* @param headers linked list of header, top is always relevant
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*/
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void insert_tcp_header(uint8_t *hdr, const PcktHeaderElement *headers, struct EthInterface_ *intf);
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/**
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* Get the flattened size of the option chain.
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* @param optLe list of TCP options
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* @return flattened size of options
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*/
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uint32_t tcp_get_options_size(TcpOption * optLe);
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/**
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* Get TCP option by filtering against kind field.
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* @param kind option kind to lookup
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* @param opt linked list of options
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* @return pointer to option OR NULL if not found
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*/
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TcpOption * tcp_get_option_by_kind(TcpOption * opt, uint16_t kind);
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#endif //ETHERLIB_TCP_SEGMENT_H
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