tcp_output.c File Reference

Include dependency graph for tcp_output.c:

Go to the source code of this file.

Data Structures
struct	tcp_tx_trace_t

Macros
#define	foreach_tcp4_output_next
#define	foreach_tcp6_output_next
#define	tcp_error(n, s)   s,
#define	tcp_get_free_buffer_index(tm, bidx)
#define	foreach_tcp4_reset_next
#define	foreach_tcp6_reset_next

Typedefs
typedef enum _tcp_output_nect	tcp_output_next_t
typedef enum _tcp_reset_next	tcp_reset_next_t

Functions
u8 *	format_tcp_tx_trace (u8 *s, va_list *args)
void	tcp_set_snd_mss (tcp_connection_t *tc)
static u8	tcp_window_compute_scale (u32 available_space)
static u32	tcp_initial_wnd_unscaled (tcp_connection_t *tc)
	TCP's IW as recommended by RFC6928. More...
u32	tcp_initial_window_to_advertise (tcp_connection_t *tc)
	Compute initial window and scale factor. More...
u32	tcp_window_to_advertise (tcp_connection_t *tc, tcp_state_t state)
	Compute and return window to advertise, scaled as per RFC1323. More...
u32	tcp_options_write (u8 *data, tcp_options_t *opts)
	Write TCP options to segment. More...
static int	tcp_make_syn_options (tcp_options_t *opts, u8 wnd_scale)
static int	tcp_make_synack_options (tcp_connection_t *tc, tcp_options_t *opts)
static int	tcp_make_established_options (tcp_connection_t *tc, tcp_options_t *opts)
static int	tcp_make_options (tcp_connection_t *tc, tcp_options_t *opts, tcp_state_t state)
static void	tcp_reuse_buffer (vlib_main_t *vm, vlib_buffer_t *b)
void	tcp_make_ack_i (tcp_connection_t *tc, vlib_buffer_t *b, tcp_state_t state, u8 flags)
	Prepare ACK. More...
void	tcp_make_ack (tcp_connection_t *tc, vlib_buffer_t *b)
	Convert buffer to ACK. More...
void	tcp_make_fin (tcp_connection_t *tc, vlib_buffer_t *b)
	Convert buffer to FIN-ACK. More...
void	tcp_make_synack (tcp_connection_t *tc, vlib_buffer_t *b)
	Convert buffer to SYN-ACK. More...
static void	tcp_enqueue_to_ip_lookup (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4)
int	tcp_make_reset_in_place (vlib_main_t *vm, vlib_buffer_t *b0, tcp_state_t state, u32 my_thread_index, u8 is_ip4)
void	tcp_send_reset (vlib_buffer_t *pkt, u8 is_ip4)
	Send reset without reusing existing buffer. More...
void	tcp_push_ip_hdr (tcp_main_t *tm, tcp_connection_t *tc, vlib_buffer_t *b)
void	tcp_send_syn (tcp_connection_t *tc)
	Send SYN. More...
static void	tcp_enqueue_to_output (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4)
void	tcp_send_fin (tcp_connection_t *tc)
	Send FIN. More...
static u8	tcp_make_state_flags (tcp_state_t next_state)
static void	tcp_push_hdr_i (tcp_connection_t *tc, vlib_buffer_t *b, tcp_state_t next_state)
	Push TCP header and update connection variables. More...
void	tcp_timer_delack_handler (u32 index)
u32	tcp_prepare_retransmit_segment (tcp_connection_t *tc, vlib_buffer_t *b, u32 max_bytes)
	Build a retransmit segment. More...
static void	tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
void	tcp_timer_retransmit_handler (u32 index)
void	tcp_timer_retransmit_syn_handler (u32 index)
void	tcp_retransmit_first_unacked (tcp_connection_t *tc)
	Retansmit first unacked segment. More...
void	tcp_fast_retransmit (tcp_connection_t *tc)
static u32	tcp_session_has_ooo_data (tcp_connection_t *tc)
static uword	tcp46_output_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, int is_ip4)
static uword	tcp4_output (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
static uword	tcp6_output (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output)
	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output)
u32	tcp_push_header (transport_connection_t *tconn, vlib_buffer_t *b)
static uword	tcp46_send_reset_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, u8 is_ip4)
static uword	tcp4_send_reset (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
static uword	tcp6_send_reset (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset)
	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset)

Variables
vlib_node_registration_t	tcp4_output_node
	(constructor) VLIB_REGISTER_NODE (tcp4_output_node) More...
vlib_node_registration_t	tcp6_output_node
	(constructor) VLIB_REGISTER_NODE (tcp6_output_node) More...
static char *	tcp_error_strings []
u16	dummy_mtu = 400
vlib_node_registration_t	tcp4_reset_node
	(constructor) VLIB_REGISTER_NODE (tcp4_reset_node) More...
vlib_node_registration_t	tcp6_reset_node
	(constructor) VLIB_REGISTER_NODE (tcp6_reset_node) More...

Macro Definition Documentation

#define foreach_tcp4_output_next

Value:

_ (DROP, "error-drop")                        \
  _ (IP_LOOKUP, "ip4-lookup")

Definition at line 29 of file tcp_output.c.

#define foreach_tcp4_reset_next

Value:

_(DROP, "error-drop")                 \
  _(IP_LOOKUP, "ip4-lookup")

Definition at line 1352 of file tcp_output.c.

#define foreach_tcp6_output_next

Value:

_ (DROP, "error-drop")                        \
  _ (IP_LOOKUP, "ip6-lookup")

Definition at line 33 of file tcp_output.c.

#define foreach_tcp6_reset_next

Value:

_(DROP, "error-drop")                 \
  _(IP_LOOKUP, "ip6-lookup")

Definition at line 1356 of file tcp_output.c.

#define tcp_error	(		n,
			s
	)		s,

#define tcp_get_free_buffer_index	(		tm,
			bidx
	)

Value:

do {                                                                    \
  u32 *my_tx_buffers, n_free_buffers;                                   \
  u32 cpu_index = tm->vlib_main->cpu_index;                             \
  my_tx_buffers = tm->tx_buffers[cpu_index];                            \
  if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0))                      \
    {                                                                   \
      n_free_buffers = 32;      /* TODO config or macro */              \
      vec_validate (my_tx_buffers, n_free_buffers - 1);                 \
      _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list (      \
          tm->vlib_main, my_tx_buffers, n_free_buffers,                 \
          VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);                         \
      tm->tx_buffers[cpu_index] = my_tx_buffers;                        \
    }                                                                   \
  /* buffer shortage */                                                 \
  if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0))                     \
    return;                                                             \
  *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1];                    \
  _vec_len (my_tx_buffers) -= 1;                                        \
} while (0)

Definition at line 363 of file tcp_output.c.

Typedef Documentation

typedef enum _tcp_output_nect tcp_output_next_t

typedef enum _tcp_reset_next tcp_reset_next_t

Function Documentation

u8* format_tcp_tx_trace	(	u8 *	s,
		va_list *	args
	)

Definition at line 53 of file tcp_output.c.

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static uword tcp46_output_inline ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame, int  is_ip4  )

inlinestatic

Definition at line 1143 of file tcp_output.c.

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static uword tcp46_send_reset_inline ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame, u8  is_ip4  )

static

Definition at line 1361 of file tcp_output.c.

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static uword tcp4_output ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame  )

static

Definition at line 1279 of file tcp_output.c.

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static uword tcp4_send_reset ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame  )

static

Definition at line 1422 of file tcp_output.c.

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static uword tcp6_output ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame  )

static

Definition at line 1286 of file tcp_output.c.

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static uword tcp6_send_reset ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame  )

static

Definition at line 1429 of file tcp_output.c.

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static void tcp_enqueue_to_ip_lookup ( vlib_main_t *  vm, vlib_buffer_t *  b, u32  bi, u8  is_ip4  )

inlinestatic

Definition at line 510 of file tcp_output.c.

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static void tcp_enqueue_to_output ( vlib_main_t *  vm, vlib_buffer_t *  b, u32  bi, u8  is_ip4  )

inlinestatic

Definition at line 788 of file tcp_output.c.

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void tcp_fast_retransmit

(

tcp_connection_t *

tc

)

Definition at line 1098 of file tcp_output.c.

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u32 tcp_initial_window_to_advertise

(

tcp_connection_t *

tc

)

Compute initial window and scale factor.

As per RFC1323, window field in SYN and SYN-ACK segments is never scaled.

Definition at line 107 of file tcp_output.c.

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static u32 tcp_initial_wnd_unscaled ( tcp_connection_t *  tc )

inlinestatic

TCP's IW as recommended by RFC6928.

Definition at line 97 of file tcp_output.c.

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void tcp_make_ack	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Convert buffer to ACK.

Definition at line 433 of file tcp_output.c.

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void tcp_make_ack_i	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		tcp_state_t	state,
		u8	flags
	)

Prepare ACK.

Definition at line 406 of file tcp_output.c.

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static int tcp_make_established_options ( tcp_connection_t *  tc, tcp_options_t *  opts  )

inlinestatic

Definition at line 315 of file tcp_output.c.

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void tcp_make_fin	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Convert buffer to FIN-ACK.

Definition at line 447 of file tcp_output.c.

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static int tcp_make_options ( tcp_connection_t *  tc, tcp_options_t *  opts, tcp_state_t  state  )

inlinestatic

Definition at line 345 of file tcp_output.c.

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int tcp_make_reset_in_place	(	vlib_main_t *	vm,
		vlib_buffer_t *	b0,
		tcp_state_t	state,
		u32	my_thread_index,
		u8	is_ip4
	)

Definition at line 534 of file tcp_output.c.

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static u8 tcp_make_state_flags ( tcp_state_t  next_state )

inlinestatic

Definition at line 831 of file tcp_output.c.

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static int tcp_make_syn_options ( tcp_options_t *  opts, u8  wnd_scale  )

inlinestatic

Definition at line 254 of file tcp_output.c.

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void tcp_make_synack	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Convert buffer to SYN-ACK.

Definition at line 468 of file tcp_output.c.

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static int tcp_make_synack_options ( tcp_connection_t *  tc, tcp_options_t *  opts  )

inlinestatic

Definition at line 280 of file tcp_output.c.

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u32 tcp_options_write	(	u8 *	data,
		tcp_options_t *	opts
	)

Write TCP options to segment.

Definition at line 171 of file tcp_output.c.

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u32 tcp_prepare_retransmit_segment	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32	max_bytes
	)

Build a retransmit segment.

Returns

the number of bytes in the segment or 0 if there's nothing to retransmit

Definition at line 922 of file tcp_output.c.

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static void tcp_push_hdr_i ( tcp_connection_t *  tc, vlib_buffer_t *  b, tcp_state_t  next_state  )

static

Push TCP header and update connection variables.

Definition at line 854 of file tcp_output.c.

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u32 tcp_push_header	(	transport_connection_t *	tconn,
		vlib_buffer_t *	b
	)

Definition at line 1336 of file tcp_output.c.

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void tcp_push_ip_hdr	(	tcp_main_t *	tm,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Definition at line 702 of file tcp_output.c.

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void tcp_retransmit_first_unacked

(

tcp_connection_t *

tc

)

Retansmit first unacked segment.

Definition at line 1077 of file tcp_output.c.

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static void tcp_reuse_buffer ( vlib_main_t *  vm, vlib_buffer_t *  b  )

inlinestatic

Definition at line 385 of file tcp_output.c.

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void tcp_send_fin

(

tcp_connection_t *

tc

)

Send FIN.

Definition at line 811 of file tcp_output.c.

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void tcp_send_reset	(	vlib_buffer_t *	pkt,
		u8	is_ip4
	)

Send reset without reusing existing buffer.

Definition at line 629 of file tcp_output.c.

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void tcp_send_syn

(

tcp_connection_t *

tc

)

Send SYN.

Builds a SYN packet for a half-open connection and sends it to ipx_lookup. The packet is not forwarded through tcpx_output to avoid doing lookups in the half_open pool.

Definition at line 734 of file tcp_output.c.

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static u32 tcp_session_has_ooo_data ( tcp_connection_t *  tc )

inlinestatic

Definition at line 1135 of file tcp_output.c.

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void tcp_set_snd_mss

(

tcp_connection_t *

tc

)

Definition at line 64 of file tcp_output.c.

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void tcp_timer_delack_handler

(

u32

index

)

Definition at line 892 of file tcp_output.c.

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void tcp_timer_retransmit_handler

(

u32

index

)

Definition at line 1063 of file tcp_output.c.

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static void tcp_timer_retransmit_handler_i ( u32  index, u8  is_syn  )

static

Definition at line 968 of file tcp_output.c.

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void tcp_timer_retransmit_syn_handler

(

u32

index

)

Definition at line 1069 of file tcp_output.c.

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static u8 tcp_window_compute_scale ( u32  available_space )

static

Definition at line 84 of file tcp_output.c.

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u32 tcp_window_to_advertise	(	tcp_connection_t *	tc,
		tcp_state_t	state
	)

Compute and return window to advertise, scaled as per RFC1323.

Definition at line 126 of file tcp_output.c.

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VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_output_node	,
		tcp4_output
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_output_node	,
		tcp6_output
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_reset_node	,
		tcp4_send_reset
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_reset_node	,
		tcp6_send_reset
	)

Variable Documentation

u16 dummy_mtu = 400

Definition at line 50 of file tcp_output.c.

vlib_node_registration_t tcp4_output_node

Initial value:

=
{
  .function = tcp4_output,.name = "tcp4-output",
    
    .vector_size = sizeof (u32),
    .n_errors = TCP_N_ERROR,
    .error_strings = tcp_error_strings,
    .n_next_nodes = TCP_OUTPUT_N_NEXT,
    .next_nodes = {
#define _(s,n) 
    foreach_tcp4_output_next

    },
    .format_buffer = format_tcp_header,
    .format_trace = format_tcp_tx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_output_node)

Definition at line 19 of file tcp_output.c.

vlib_node_registration_t tcp4_reset_node

Initial value:

= {
  .function = tcp4_send_reset,
  .name = "tcp4-reset",
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_RESET_N_NEXT,
  .next_nodes = {
#define _(s,n) 
    foreach_tcp4_reset_next

  },
}

(constructor) VLIB_REGISTER_NODE (tcp4_reset_node)

Definition at line 1436 of file tcp_output.c.

vlib_node_registration_t tcp6_output_node

Initial value:

=
{
  .function = tcp6_output,
  .name = "tcp6-output",
    
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_OUTPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) 
    foreach_tcp6_output_next

  },
  .format_buffer = format_tcp_header,
  .format_trace = format_tcp_tx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_output_node)

Definition at line 20 of file tcp_output.c.

vlib_node_registration_t tcp6_reset_node

Initial value:

= {
  .function = tcp6_send_reset,
  .name = "tcp6-reset",
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_RESET_N_NEXT,
  .next_nodes = {
#define _(s,n) 
    foreach_tcp6_reset_next

  },
}

(constructor) VLIB_REGISTER_NODE (tcp6_reset_node)

Definition at line 1454 of file tcp_output.c.

char* tcp_error_strings[]

static

Initial value:

= {
#define tcp_error(n,s) 


}

Definition at line 37 of file tcp_output.c.