tcp_packet.h File Reference

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Data Structures
struct	tcp_options_t

Macros
#define	foreach_tcp_flag
	Sender reduced congestion window. More...
#define	tcp_doff(_th)   ((_th)->data_offset_and_reserved >> 4)
#define	tcp_fin(_th)   ((_th)->flags & TCP_FLAG_FIN)
#define	tcp_syn(_th)   ((_th)->flags & TCP_FLAG_SYN)
#define	tcp_rst(_th)   ((_th)->flags & TCP_FLAG_RST)
#define	tcp_psh(_th)   ((_th)->flags & TCP_FLAG_PSH)
#define	tcp_ack(_th)   ((_th)->flags & TCP_FLAG_ACK)
#define	tcp_urg(_th)   ((_th)->flags & TCP_FLAG_URG)
#define	tcp_ece(_th)   ((_th)->flags & TCP_FLAG_ECE)
#define	tcp_cwr(_th)   ((_th)->flags & TCP_FLAG_CWR)
#define	tcp_is_syn(_th)   !!((_th)->flags & TCP_FLAG_SYN)
#define	tcp_is_fin(_th)   !!((_th)->flags & TCP_FLAG_FIN)
#define	foreach_tcp_options_flag
	SACK present. More...
#define	tcp_opts_mss(_to)   ((_to)->flags & TCP_OPTS_FLAG_MSS)
#define	tcp_opts_tstamp(_to)   ((_to)->flags & TCP_OPTS_FLAG_TSTAMP)
#define	tcp_opts_wscale(_to)   ((_to)->flags & TCP_OPTS_FLAG_WSCALE)
#define	tcp_opts_sack(_to)   ((_to)->flags & TCP_OPTS_FLAG_SACK)
#define	tcp_opts_sack_permitted(_to)   ((_to)->flags & TCP_OPTS_FLAG_SACK_PERMITTED)
#define	TCP_OPTION_LEN_EOL   1
#define	TCP_OPTION_LEN_NOOP   1
#define	TCP_OPTION_LEN_MSS   4
#define	TCP_OPTION_LEN_WINDOW_SCALE   3
#define	TCP_OPTION_LEN_SACK_PERMITTED   2
#define	TCP_OPTION_LEN_TIMESTAMP   10
#define	TCP_OPTION_LEN_SACK_BLOCK   8
#define	TCP_HDR_LEN_MAX   60
#define	TCP_WND_MAX   65535U
#define	TCP_MAX_WND_SCALE   14 /* See RFC 1323 */
#define	TCP_OPTS_ALIGN   4
#define	TCP_OPTS_MAX_SACK_BLOCKS   3
#define	seq_lt(_s1, _s2)   ((i32)((_s1)-(_s2)) < 0)
#define	seq_leq(_s1, _s2)   ((i32)((_s1)-(_s2)) <= 0)
#define	seq_gt(_s1, _s2)   ((i32)((_s1)-(_s2)) > 0)
#define	seq_geq(_s1, _s2)   ((i32)((_s1)-(_s2)) >= 0)
#define	seq_max(_s1, _s2)   (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
#define	timestamp_lt(_t1, _t2)   ((i32)((_t1)-(_t2)) < 0)
#define	timestamp_leq(_t1, _t2)   ((i32)((_t1)-(_t2)) <= 0)

Typedefs
typedef struct _tcp_header	tcp_header_t
typedef enum tcp_option_type	tcp_option_type_t
typedef struct _sack_block	sack_block_t

Enumerations
enum	{ TCP_N_FLAG_BITS }
enum	{ foreach_tcp_flag }
enum	tcp_option_type {   TCP_OPTION_EOL = 0, TCP_OPTION_NOOP = 1, TCP_OPTION_MSS = 2, TCP_OPTION_WINDOW_SCALE = 3,   TCP_OPTION_SACK_PERMITTED = 4, TCP_OPTION_SACK_BLOCK = 5, TCP_OPTION_TIMESTAMP = 8, TCP_OPTION_UTO = 28,   TCP_OPTION_AO = 29 }
enum	{ TCP_OPTIONS_N_FLAG_BITS }
enum	{ foreach_tcp_options_flag }

Functions
static int	tcp_header_bytes (tcp_header_t *t)
static int	tcp_options_parse (tcp_header_t *th, tcp_options_t *to, u8 is_syn)
	Parse TCP header options. More...
static u32	tcp_options_write (u8 *data, tcp_options_t *opts)
	Write TCP options to segment. More...

Macro Definition Documentation

foreach_tcp_flag

#define foreach_tcp_flag

Value:

_ (FIN) /**< No more data from sender. */             \
  _ (SYN) /**< Synchronize sequence numbers. */         \
  _ (RST) /**< Reset the connection. */                 \
  _ (PSH) /**< Push function. */                        \
  _ (ACK) /**< Ack field significant. */                \
  _ (URG) /**< Urgent pointer field significant. */     \
  _ (ECE) /**< ECN-echo. Receiver got CE packet */      \
  _ (CWR)

Sender reduced congestion window.

Definition at line 22 of file tcp_packet.h.

foreach_tcp_options_flag

#define foreach_tcp_options_flag

Value:

_ (MSS)               /**< MSS advertised in SYN */                   \
  _ (TSTAMP)            /**< Timestamp capability advertised in SYN */  \
  _ (WSCALE)            /**< Wnd scale capability advertised in SYN */  \
  _ (SACK_PERMITTED)    /**< SACK capability advertised in SYN */       \
  _ (SACK)

SACK present.

Definition at line 115 of file tcp_packet.h.

seq_geq

#define seq_geq	(		_s1,
			_s2
	)		((i32)((_s1)-(_s2)) >= 0)

Definition at line 180 of file tcp_packet.h.

seq_gt

#define seq_gt	(		_s1,
			_s2
	)		((i32)((_s1)-(_s2)) > 0)

Definition at line 179 of file tcp_packet.h.

seq_leq

#define seq_leq	(		_s1,
			_s2
	)		((i32)((_s1)-(_s2)) <= 0)

Definition at line 178 of file tcp_packet.h.

seq_lt

#define seq_lt	(		_s1,
			_s2
	)		((i32)((_s1)-(_s2)) < 0)

Definition at line 177 of file tcp_packet.h.

seq_max

#define seq_max	(		_s1,
			_s2
	)		(seq_gt((_s1), (_s2)) ? (_s1) : (_s2))

Definition at line 181 of file tcp_packet.h.

tcp_ack

#define tcp_ack

(

_th

)

((_th)->flags & TCP_FLAG_ACK)

Definition at line 83 of file tcp_packet.h.

tcp_cwr

#define tcp_cwr

(

_th

)

((_th)->flags & TCP_FLAG_CWR)

Definition at line 86 of file tcp_packet.h.

tcp_doff

#define tcp_doff

(

_th

)

((_th)->data_offset_and_reserved >> 4)

Definition at line 78 of file tcp_packet.h.

tcp_ece

#define tcp_ece

(

_th

)

((_th)->flags & TCP_FLAG_ECE)

Definition at line 85 of file tcp_packet.h.

tcp_fin

#define tcp_fin

(

_th

)

((_th)->flags & TCP_FLAG_FIN)

Definition at line 79 of file tcp_packet.h.

TCP_HDR_LEN_MAX

#define TCP_HDR_LEN_MAX   60

Definition at line 170 of file tcp_packet.h.

tcp_is_fin

#define tcp_is_fin

(

_th

)

!!((_th)->flags & TCP_FLAG_FIN)

Definition at line 90 of file tcp_packet.h.

tcp_is_syn

#define tcp_is_syn

(

_th

)

!!((_th)->flags & TCP_FLAG_SYN)

Definition at line 89 of file tcp_packet.h.

TCP_MAX_WND_SCALE

#define TCP_MAX_WND_SCALE   14 /* See RFC 1323 */

Definition at line 172 of file tcp_packet.h.

TCP_OPTION_LEN_EOL

#define TCP_OPTION_LEN_EOL   1

Definition at line 162 of file tcp_packet.h.

TCP_OPTION_LEN_MSS

#define TCP_OPTION_LEN_MSS   4

Definition at line 164 of file tcp_packet.h.

TCP_OPTION_LEN_NOOP

#define TCP_OPTION_LEN_NOOP   1

Definition at line 163 of file tcp_packet.h.

TCP_OPTION_LEN_SACK_BLOCK

#define TCP_OPTION_LEN_SACK_BLOCK   8

Definition at line 168 of file tcp_packet.h.

TCP_OPTION_LEN_SACK_PERMITTED

#define TCP_OPTION_LEN_SACK_PERMITTED   2

Definition at line 166 of file tcp_packet.h.

TCP_OPTION_LEN_TIMESTAMP

#define TCP_OPTION_LEN_TIMESTAMP   10

Definition at line 167 of file tcp_packet.h.

TCP_OPTION_LEN_WINDOW_SCALE

#define TCP_OPTION_LEN_WINDOW_SCALE   3

Definition at line 165 of file tcp_packet.h.

TCP_OPTS_ALIGN

#define TCP_OPTS_ALIGN   4

Definition at line 173 of file tcp_packet.h.

TCP_OPTS_MAX_SACK_BLOCKS

#define TCP_OPTS_MAX_SACK_BLOCKS   3

Definition at line 174 of file tcp_packet.h.

tcp_opts_mss

#define tcp_opts_mss

(

_to

)

((_to)->flags & TCP_OPTS_FLAG_MSS)

Definition at line 155 of file tcp_packet.h.

tcp_opts_sack

#define tcp_opts_sack

(

_to

)

((_to)->flags & TCP_OPTS_FLAG_SACK)

Definition at line 158 of file tcp_packet.h.

tcp_opts_sack_permitted

#define tcp_opts_sack_permitted

(

_to

)

((_to)->flags & TCP_OPTS_FLAG_SACK_PERMITTED)

Definition at line 159 of file tcp_packet.h.

tcp_opts_tstamp

#define tcp_opts_tstamp

(

_to

)

((_to)->flags & TCP_OPTS_FLAG_TSTAMP)

Definition at line 156 of file tcp_packet.h.

tcp_opts_wscale

#define tcp_opts_wscale

(

_to

)

((_to)->flags & TCP_OPTS_FLAG_WSCALE)

Definition at line 157 of file tcp_packet.h.

tcp_psh

#define tcp_psh

(

_th

)

((_th)->flags & TCP_FLAG_PSH)

Definition at line 82 of file tcp_packet.h.

tcp_rst

#define tcp_rst

(

_th

)

((_th)->flags & TCP_FLAG_RST)

Definition at line 81 of file tcp_packet.h.

tcp_syn

#define tcp_syn

(

_th

)

((_th)->flags & TCP_FLAG_SYN)

Definition at line 80 of file tcp_packet.h.

tcp_urg

#define tcp_urg

(

_th

)

((_th)->flags & TCP_FLAG_URG)

Definition at line 84 of file tcp_packet.h.

TCP_WND_MAX

#define TCP_WND_MAX   65535U

Definition at line 171 of file tcp_packet.h.

timestamp_leq

#define timestamp_leq	(		_t1,
			_t2
	)		((i32)((_t1)-(_t2)) <= 0)

Definition at line 185 of file tcp_packet.h.

timestamp_lt

#define timestamp_lt	(		_t1,
			_t2
	)		((i32)((_t1)-(_t2)) < 0)

Definition at line 184 of file tcp_packet.h.

Typedef Documentation

sack_block_t

typedef struct _sack_block sack_block_t

tcp_header_t

typedef struct _tcp_header tcp_header_t

tcp_option_type_t

typedef enum tcp_option_type tcp_option_type_t

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
TCP_N_FLAG_BITS

Definition at line 32 of file tcp_packet.h.

anonymous enum

anonymous enum

Enumerator
foreach_tcp_flag

Definition at line 40 of file tcp_packet.h.

anonymous enum

anonymous enum

Enumerator
TCP_OPTIONS_N_FLAG_BITS

Definition at line 122 of file tcp_packet.h.

anonymous enum

anonymous enum

Enumerator
foreach_tcp_options_flag

Definition at line 130 of file tcp_packet.h.

tcp_option_type

enum tcp_option_type

Enumerator
TCP_OPTION_EOL	End of options.
TCP_OPTION_NOOP	No operation.
TCP_OPTION_MSS	Limit MSS.
TCP_OPTION_WINDOW_SCALE	Window scale.
TCP_OPTION_SACK_PERMITTED	Selective Ack permitted.
TCP_OPTION_SACK_BLOCK	Selective Ack block.
TCP_OPTION_TIMESTAMP	Timestamps.
TCP_OPTION_UTO	User timeout.
TCP_OPTION_AO	Authentication Option.

Definition at line 102 of file tcp_packet.h.

Function Documentation

tcp_header_bytes()

static int tcp_header_bytes ( tcp_header_t *  t )

inlinestatic

Definition at line 93 of file tcp_packet.h.

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tcp_options_parse()

static int tcp_options_parse ( tcp_header_t *  th, tcp_options_t *  to, u8  is_syn  )

inlinestatic

Parse TCP header options.

Parameters

th	TCP header
to	TCP options data structure to be populated
is_syn	set if packet is syn

Returns

-1 if parsing failed

Definition at line 196 of file tcp_packet.h.

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tcp_options_write()

static u32 tcp_options_write ( u8 *  data, tcp_options_t *  opts  )

inlinestatic

Write TCP options to segment.

Parameters

data	buffer where to write the options
opts	options to write

Returns

length of options written

Definition at line 308 of file tcp_packet.h.

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