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	foreach_tcp4_reset_next
#define	foreach_tcp6_reset_next

Typedefs
typedef enum _tcp_output_next	tcp_output_next_t
typedef enum _tcp_reset_next	tcp_reset_next_t

Functions
u8 *	format_tcp_tx_trace (u8 *s, va_list *args)
static u8	tcp_window_compute_scale (u32 window)
void	tcp_update_rcv_mss (tcp_connection_t *tc)
	Update max segment size we're able to process. More...
static u32	tcp_initial_wnd_unscaled (tcp_connection_t *tc)
	TCP's initial window. 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...
void	tcp_update_rcv_wnd (tcp_connection_t *tc)
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)
void	tcp_update_snd_mss (tcp_connection_t *tc)
	Update snd_mss to reflect the effective segment size that we can send by taking into account all TCP options, including SACKs. More...
void	tcp_init_mss (tcp_connection_t *tc)
static int	tcp_alloc_tx_buffers (tcp_main_t *tm, u8 thread_index, u32 n_free_buffers)
static int	tcp_get_free_buffer_index (tcp_main_t *tm, u32 *bidx)
static void	tcp_return_buffer (tcp_main_t *tm)
static void *	tcp_reuse_buffer (vlib_main_t *vm, vlib_buffer_t *b)
static void *	tcp_init_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_syn (tcp_connection_t *tc, vlib_buffer_t *b)
	Convert buffer to SYN. 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_i (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4, u32 fib_index, u8 flush)
static void	tcp_enqueue_to_ip_lookup_now (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4, u32 fib_index)
static void	tcp_enqueue_to_ip_lookup (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4, u32 fib_index)
static void	tcp_enqueue_to_output_i (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4, u8 flush)
static void	tcp_enqueue_to_output (vlib_main_t *vm, vlib_buffer_t *b, u32 bi, u8 is_ip4)
static void	tcp_enqueue_to_output_now (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, u8 thread_index, u8 is_ip4)
void	tcp_send_reset_w_pkt (tcp_connection_t *tc, vlib_buffer_t *pkt, u8 is_ip4)
	Send reset without reusing existing buffer. More...
void	tcp_send_reset (tcp_connection_t *tc)
	Build and set reset packet for connection. 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...
void	tcp_flush_frame_to_output (vlib_main_t *vm, u8 thread_index, u8 is_ip4)
	Flush tx frame populated by retransmits and timer pops. More...
static void	tcp_flush_frame_to_ip_lookup (vlib_main_t *vm, u8 thread_index, u8 is_ip4)
	Flush ip lookup tx frames populated by timer pops. More...
void	tcp_flush_frames_to_output (u8 thread_index)
	Flush v4 and v6 tcp and ip-lookup tx frames for thread index. More...
void	tcp_send_fin (tcp_connection_t *tc)
	Send FIN. More...
static u8	tcp_make_state_flags (tcp_connection_t *tc, tcp_state_t next_state)
static void	tcp_push_hdr_i (tcp_connection_t *tc, vlib_buffer_t *b, tcp_state_t next_state, u8 compute_opts)
	Push TCP header and update connection variables. More...
void	tcp_send_ack (tcp_connection_t *tc)
void	tcp_timer_delack_handler (u32 index)
	Delayed ack timer handler. More...
u32	tcp_prepare_retransmit_segment (tcp_connection_t *tc, u32 offset, u32 max_deq_bytes, vlib_buffer_t **b)
	Build a retransmit segment. More...
static void	tcp_rtx_timeout_cc (tcp_connection_t *tc)
	Reset congestion control, switch cwnd to loss window and try again. 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_timer_persist_handler (u32 index)
	Got 0 snd_wnd from peer, try to do something about it. More...
void	tcp_retransmit_first_unacked (tcp_connection_t *tc)
	Retransmit first unacked segment. More...
void	tcp_fast_retransmit_sack (tcp_connection_t *tc)
	Do fast retransmit with SACKs. More...
void	tcp_fast_retransmit_no_sack (tcp_connection_t *tc)
	Fast retransmit without SACK info. More...
void	tcp_fast_retransmit (tcp_connection_t *tc)
	Do fast retransmit. More...
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 = 1460
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 30 of file tcp_output.c.

#define foreach_tcp4_reset_next

Value:

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

Definition at line 1999 of file tcp_output.c.

#define foreach_tcp6_output_next

Value:

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

Definition at line 34 of file tcp_output.c.

#define foreach_tcp6_reset_next

Value:

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

Definition at line 2003 of file tcp_output.c.

#define tcp_error	(		n,
			s
	)		s,

Typedef Documentation

typedef enum _tcp_output_next 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 1751 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 2008 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 1918 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 2077 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 1925 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 2084 of file tcp_output.c.

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static int tcp_alloc_tx_buffers ( tcp_main_t *  tm, u8  thread_index, u32  n_free_buffers  )

inlinestatic

Definition at line 440 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, u32  fib_index  )

inlinestatic

Definition at line 676 of file tcp_output.c.

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static void tcp_enqueue_to_ip_lookup_i ( vlib_main_t *  vm, vlib_buffer_t *  b, u32  bi, u8  is_ip4, u32  fib_index, u8  flush  )

inlinestatic

Definition at line 632 of file tcp_output.c.

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

inlinestatic

Definition at line 669 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 717 of file tcp_output.c.

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

inlinestatic

Definition at line 683 of file tcp_output.c.

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

inlinestatic

Definition at line 723 of file tcp_output.c.

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void tcp_fast_retransmit

(

tcp_connection_t *

tc

)

Do fast retransmit.

Definition at line 1734 of file tcp_output.c.

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void tcp_fast_retransmit_no_sack

(

tcp_connection_t *

tc

)

Fast retransmit without SACK info.

Definition at line 1697 of file tcp_output.c.

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void tcp_fast_retransmit_sack

(

tcp_connection_t *

tc

)

Do fast retransmit with SACKs.

Definition at line 1620 of file tcp_output.c.

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static void tcp_flush_frame_to_ip_lookup ( vlib_main_t *  vm, u8  thread_index, u8  is_ip4  )

inlinestatic

Flush ip lookup tx frames populated by timer pops.

Definition at line 1022 of file tcp_output.c.

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void tcp_flush_frame_to_output	(	vlib_main_t *	vm,
		u8	thread_index,
		u8	is_ip4
	)

Flush tx frame populated by retransmits and timer pops.

Definition at line 1006 of file tcp_output.c.

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void tcp_flush_frames_to_output

(

u8

thread_index

)

Flush v4 and v6 tcp and ip-lookup tx frames for thread index.

Definition at line 1039 of file tcp_output.c.

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static int tcp_get_free_buffer_index ( tcp_main_t *  tm, u32 *  bidx  )

inlinestatic

Definition at line 462 of file tcp_output.c.

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

inlinestatic

Definition at line 503 of file tcp_output.c.

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void tcp_init_mss

(

tcp_connection_t *

tc

)

Definition at line 415 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 113 of file tcp_output.c.

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static u32 tcp_initial_wnd_unscaled ( tcp_connection_t *  tc )

inlinestatic

TCP's initial window.

Definition at line 94 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 544 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 519 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 348 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 559 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 379 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,
		u8	thread_index,
		u8	is_ip4
	)

Definition at line 730 of file tcp_output.c.

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static u8 tcp_make_state_flags ( tcp_connection_t *  tc, tcp_state_t  next_state  )

inlinestatic

Definition at line 1085 of file tcp_output.c.

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void tcp_make_syn	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

Convert buffer to SYN.

Definition at line 577 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 284 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 602 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 313 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 201 of file tcp_output.c.

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u32 tcp_prepare_retransmit_segment	(	tcp_connection_t *	tc,
		u32	offset,
		u32	max_deq_bytes,
		vlib_buffer_t **	b
	)

Build a retransmit segment.

Returns

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

Definition at line 1198 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, u8  compute_opts  )

static

Push TCP header and update connection variables.

Definition at line 1111 of file tcp_output.c.

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u32 tcp_push_header	(	transport_connection_t *	tconn,
		vlib_buffer_t *	b
	)

Definition at line 1975 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 939 of file tcp_output.c.

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void tcp_retransmit_first_unacked

(

tcp_connection_t *

tc

)

Retransmit first unacked segment.

Definition at line 1597 of file tcp_output.c.

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static void tcp_return_buffer ( tcp_main_t *  tm )

inlinestatic

Definition at line 481 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 487 of file tcp_output.c.

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static void tcp_rtx_timeout_cc ( tcp_connection_t *  tc )

static

Reset congestion control, switch cwnd to loss window and try again.

Definition at line 1336 of file tcp_output.c.

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void tcp_send_ack

(

tcp_connection_t *

tc

)

Definition at line 1157 of file tcp_output.c.

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void tcp_send_fin

(

tcp_connection_t *

tc

)

Send FIN.

Definition at line 1052 of file tcp_output.c.

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void tcp_send_reset

(

tcp_connection_t *

tc

)

Build and set reset packet for connection.

Definition at line 893 of file tcp_output.c.

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void tcp_send_reset_w_pkt	(	tcp_connection_t *	tc,
		vlib_buffer_t *	pkt,
		u8	is_ip4
	)

Send reset without reusing existing buffer.

It extracts connection info out of original packet

Definition at line 814 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 970 of file tcp_output.c.

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static u32 tcp_session_has_ooo_data ( tcp_connection_t *  tc )

inlinestatic

Definition at line 1744 of file tcp_output.c.

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void tcp_timer_delack_handler

(

u32

index

)

Delayed ack timer handler.

Sends delayed ACK when timer expires

Definition at line 1181 of file tcp_output.c.

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void tcp_timer_persist_handler

(

u32

index

)

Got 0 snd_wnd from peer, try to do something about it.

Definition at line 1523 of file tcp_output.c.

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void tcp_timer_retransmit_handler

(

u32

index

)

Definition at line 1507 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 1354 of file tcp_output.c.

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void tcp_timer_retransmit_syn_handler

(

u32

index

)

Definition at line 1513 of file tcp_output.c.

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void tcp_update_rcv_mss

(

tcp_connection_t *

tc

)

Update max segment size we're able to process.

The value is constrained by our interface's MTU and IP options. It is also what we advertise to our peer.

Definition at line 84 of file tcp_output.c.

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void tcp_update_rcv_wnd

(

tcp_connection_t *

tc

)

Definition at line 152 of file tcp_output.c.

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void tcp_update_snd_mss

(

tcp_connection_t *

tc

)

Update snd_mss to reflect the effective segment size that we can send by taking into account all TCP options, including SACKs.

Definition at line 402 of file tcp_output.c.

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static u8 tcp_window_compute_scale ( u32  window )

static

Definition at line 69 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 132 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 = 1460

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 20 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

  },
  .format_trace = format_tcp_tx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_reset_node)

Definition at line 2091 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 21 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

  },
  .format_trace = format_tcp_tx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_reset_node)

Definition at line 2110 of file tcp_output.c.

char* tcp_error_strings[]

static

Initial value:

= {
#define tcp_error(n,s) 


}

Definition at line 38 of file tcp_output.c.