TCP header description. More...

#include <stdint.h>
#include "config.h"

Include dependency graph for tcp.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	tcphdr
	The TCP base header without options. More...

struct	sack_block_t
	The Selective Acknowlegment TCP option. More...

struct	tcp_option_timestamp

Macros
#define	RSF_RST_ONLY 0x04

#define	RSF_SYN_ONLY 0x02

#define	RSF_FIN_ONLY 0x01

#define	RSF_NONE 0x00

#define	ROHC_TCP_OPTS_LEN_MAX_PROTO (15U * 4U - (uint8_t) sizeof(struct tcphdr))
	The maximum length of TCP options supported by the TCP protocol. More...

#define	ROHC_TCP_OPTS_MAX_PROTO ROHC_TCP_OPTS_LEN_MAX_PROTO
	The maximum of TCP options supported by the TCP protocol. More...

#define	ROHC_TCP_OPTS_MAX 15U
	The maximum of TCP options supported by the TCP profile. More...

#define	ROHC_TCP_OPT_HDR_LEN 2U

#define	ROHC_TCP_OPT_MAX_LEN_PROTO 0xffU

#define	TCP_OLEN_MSS 4U

#define	TCP_OLEN_WS 3U

#define	TCP_OLEN_SACK_PERM 2U

#define	TCP_OLEN_TS 10U

#define	TCP_SACK_BLOCKS_MAX_NR 4U

Enumerations
enum	rohc_tcp_option_type_t { TCP_OPT_EOL = 0U, TCP_OPT_NOP = 1U, TCP_OPT_MSS = 2U, TCP_OPT_WS = 3U, TCP_OPT_SACK_PERM = 4U, TCP_OPT_SACK = 5U, TCP_OPT_TS = 8U, TCP_OPT_MAX = 255U }

Functions
static char *	tcp_opt_get_descr (const uint8_t opt_type)
	Get a string that describes the given option type. More...

Detailed Description

TCP header description.

Author: FWX rohc_.nosp@m.team.nosp@m.@dial.nosp@m.ine..nosp@m.fr; Didier Barvaux didie.nosp@m.r@ba.nosp@m.rvaux.nosp@m..org; Didier Barvaux didie.nosp@m.r.ba.nosp@m.rvaux.nosp@m.@tou.nosp@m.louse.nosp@m..viv.nosp@m.eris..nosp@m.com

Macro Definition Documentation

◆ ROHC_TCP_OPT_HDR_LEN

#define ROHC_TCP_OPT_HDR_LEN 2U

The length of the header of one TCP option

◆ ROHC_TCP_OPT_MAX_LEN_PROTO

#define ROHC_TCP_OPT_MAX_LEN_PROTO 0xffU

The maximum length of TCP options supported by the TCP protocol

◆ ROHC_TCP_OPTS_LEN_MAX_PROTO

#define ROHC_TCP_OPTS_LEN_MAX_PROTO (15U * 4U - (uint8_t) sizeof(struct tcphdr))

The maximum length of TCP options supported by the TCP protocol.

The TCP data offset is coded on 32-bit words on 4 bits, so the whole TCP header may be up to 15*4=60 bytes. The base TCP header is 20-byte long.

◆ ROHC_TCP_OPTS_MAX

#define ROHC_TCP_OPTS_MAX 15U

The maximum of TCP options supported by the TCP profile.

One TCP header may contain up to 40 bytes of options, so it may contain up 40 1-byte options, so the ROHC (de)compressors should expect such TCP packets. However the m field in the compressed list of TCP options (see RFC 6846, section 6.3.3 for more details) cannot be larger than 15, so restrict the number of TCP options that value. One TCP packet with more than 15 TCP options will be compressed with the IP-only profile.

See also: ROHC_TCP_OPTS_MAX_PROTO

◆ ROHC_TCP_OPTS_MAX_PROTO

#define ROHC_TCP_OPTS_MAX_PROTO ROHC_TCP_OPTS_LEN_MAX_PROTO

The maximum of TCP options supported by the TCP protocol.

One TCP header may contain up to 40 bytes of options, so it may contain up 40 1-byte options.

See also: ROHC_TCP_OPTS_MAX

◆ RSF_FIN_ONLY

#define RSF_FIN_ONLY 0x01

◆ RSF_NONE

#define RSF_NONE 0x00

◆ RSF_RST_ONLY

#define RSF_RST_ONLY 0x04

◆ RSF_SYN_ONLY

#define RSF_SYN_ONLY 0x02

◆ TCP_OLEN_MSS

#define TCP_OLEN_MSS 4U

◆ TCP_OLEN_SACK_PERM

#define TCP_OLEN_SACK_PERM 2U

◆ TCP_OLEN_TS

#define TCP_OLEN_TS 10U

◆ TCP_OLEN_WS

#define TCP_OLEN_WS 3U

◆ TCP_SACK_BLOCKS_MAX_NR

#define TCP_SACK_BLOCKS_MAX_NR 4U

The maximum number of SACK blocks in the TCP SACK option

Enumeration Type Documentation

◆ rohc_tcp_option_type_t

enum rohc_tcp_option_type_t

The different TCP options

Enumerator
TCP_OPT_EOL	The End of Option List (EOL) TCP option
TCP_OPT_NOP	The No OPeration (NOP) TCP option
TCP_OPT_MSS	The Maximum Segment Size (MSS) TCP option
TCP_OPT_WS	The Window Scale (WS) TCP option
TCP_OPT_SACK_PERM	The SACK Permitted TCP option
TCP_OPT_SACK	The Selective ACKnowledgement (SACK) TCP option
TCP_OPT_TS	The TimeStamp (TS) TCP option
TCP_OPT_MAX	The maximum TCP option

Function Documentation

◆ tcp_opt_get_descr()

static char * tcp_opt_get_descr ( const uint8_t opt_type )

inlinestatic

Get a string that describes the given option type.

Parameters

opt_type The type of the option to get a description for

Returns: The description of the option

Data Structures

Macros

Enumerations

Functions