Include dependency graph for tcp_input.c:

Data Structures
struct	tcp_rx_trace_t

Macros
#define	tcp_error(n, s) s,

#define	foreach_tcp_state_next

#define	tcp_next_output(is_ip4)

#define	tcp_next_drop(is_ip4)

#define	tcp_maybe_inc_counter(node_id, err, count)

#define	tcp_inc_counter(node_id, err, count)

#define	tcp_maybe_inc_err_counter(cnts, err)

#define	tcp_inc_err_counter(cnts, err, val)

#define	tcp_store_err_counters(node_id, cnts)

#define	foreach_tcp4_input_next

#define	foreach_tcp6_input_next

#define	filter_flags (TCP_FLAG_SYN\|TCP_FLAG_ACK\|TCP_FLAG_RST\|TCP_FLAG_FIN)

Typedefs
typedef enum _tcp_established_next	tcp_established_next_t

typedef enum _tcp_rcv_process_next	tcp_rcv_process_next_t

typedef enum _tcp_syn_sent_next	tcp_syn_sent_next_t

typedef enum _tcp_listen_next	tcp_listen_next_t

typedef enum _tcp_state_next	tcp_state_next_t

typedef enum _tcp_input_next	tcp_input_next_t

Functions
static u8	tcp_segment_in_rcv_wnd (tcp_connection_t *tc, u32 seq, u32 end_seq)
	Validate segment sequence number. More...

static int	tcp_segment_check_paws (tcp_connection_t *tc)
	RFC1323: Check against wrapped sequence numbers (PAWS). More...

static void	tcp_update_timestamp (tcp_connection_t *tc, u32 seq, u32 seq_end)
	Update tsval recent. More...

static void	tcp_handle_rst (tcp_connection_t *tc)

static void	tcp_program_reset_ntf (tcp_worker_ctx_t wrk, tcp_connection_t tc)

static void	tcp_rcv_rst (tcp_worker_ctx_t wrk, tcp_connection_t tc)
	Handle reset packet. More...

static int	tcp_segment_validate (tcp_worker_ctx_t wrk, tcp_connection_t tc0, vlib_buffer_t b0, tcp_header_t th0, u32 *error0)
	Validate incoming segment as per RFC793 p. More...

static int	tcp_rcv_ack_no_cc (tcp_connection_t tc, vlib_buffer_t b, u32 *error)

static void	tcp_estimate_rtt (tcp_connection_t *tc, u32 mrtt)
	Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298. More...

static void	tcp_estimate_rtt_us (tcp_connection_t *tc, f64 mrtt)

static int	tcp_update_rtt (tcp_connection_t tc, tcp_rate_sample_t rs, u32 ack)
	Update rtt estimate. More...

static void	tcp_estimate_initial_rtt (tcp_connection_t *tc)

static void	tcp_handle_postponed_dequeues (tcp_worker_ctx_t *wrk)
	Dequeue bytes for connections that have received acks in last burst. More...

static void	tcp_program_dequeue (tcp_worker_ctx_t wrk, tcp_connection_t tc)

static void	tcp_update_snd_wnd (tcp_connection_t *tc, u32 seq, u32 ack, u32 snd_wnd)
	Try to update snd_wnd based on feedback received from peer. More...

static void	tcp_cc_init_congestion (tcp_connection_t *tc)
	Init loss recovery/fast recovery. More...

static void	tcp_cc_congestion_undo (tcp_connection_t *tc)

static u8	tcp_cc_is_spurious_timeout_rxt (tcp_connection_t *tc)

static u8	tcp_cc_is_spurious_retransmit (tcp_connection_t *tc)

static u8	tcp_should_fastrecover (tcp_connection_t *tc, u8 has_sack)

static int	tcp_cc_recover (tcp_connection_t *tc)

static void	tcp_cc_update (tcp_connection_t tc, tcp_rate_sample_t rs)

static void	tcp_cc_handle_event (tcp_connection_t tc, tcp_rate_sample_t rs, u32 is_dack)
	One function to rule them all ... More...

static void	tcp_handle_old_ack (tcp_connection_t tc, tcp_rate_sample_t rs)

static u8	tcp_ack_is_dupack (tcp_connection_t tc, vlib_buffer_t b, u32 prev_snd_wnd, u32 prev_snd_una)
	Check if duplicate ack as per RFC5681 Sec. More...

static u8	tcp_ack_is_cc_event (tcp_connection_t tc, vlib_buffer_t b, u32 prev_snd_wnd, u32 prev_snd_una, u8 *is_dack)
	Checks if ack is a congestion control event. More...

static int	tcp_rcv_ack (tcp_worker_ctx_t wrk, tcp_connection_t tc, vlib_buffer_t b, tcp_header_t th, u32 *error)
	Process incoming ACK. More...

static void	tcp_program_disconnect (tcp_worker_ctx_t wrk, tcp_connection_t tc)

static void	tcp_handle_disconnects (tcp_worker_ctx_t *wrk)

static void	tcp_rcv_fin (tcp_worker_ctx_t wrk, tcp_connection_t tc, vlib_buffer_t b, u32 error)

static int	tcp_session_enqueue_data (tcp_connection_t tc, vlib_buffer_t b, u16 data_len)
	Enqueue data for delivery to application. More...

static int	tcp_session_enqueue_ooo (tcp_connection_t tc, vlib_buffer_t b, u16 data_len)
	Enqueue out-of-order data. More...

static int	tcp_buffer_discard_bytes (vlib_buffer_t *b, u32 n_bytes_to_drop)

static int	tcp_segment_rcv (tcp_worker_ctx_t wrk, tcp_connection_t tc, vlib_buffer_t *b)
	Receive buffer for connection and handle acks. More...

static u8 *	format_tcp_rx_trace (u8 s, va_list args)

static u8 *	format_tcp_rx_trace_short (u8 s, va_list args)

static void	tcp_set_rx_trace_data (tcp_rx_trace_t t0, tcp_connection_t tc0, tcp_header_t th0, vlib_buffer_t b0, u8 is_ip4)

static void	tcp_established_trace_frame (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *frame, u8 is_ip4)

static void	tcp_node_inc_counter_i (vlib_main_t *vm, u32 tcp4_node, u32 tcp6_node, u8 is_ip4, u32 evt, u32 val)

static uword	tcp46_established_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *frame, int is_ip4)

VLIB_NODE_FN()	tcp4_established_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_established_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static u8	tcp_lookup_is_valid (tcp_connection_t tc, vlib_buffer_t b, tcp_header_t *hdr)

static tcp_connection_t *	tcp_lookup_connection (u32 fib_index, vlib_buffer_t *b, u8 thread_index, u8 is_ip4)
	Lookup transport connection. More...

static tcp_connection_t *	tcp_lookup_listener (vlib_buffer_t *b, u32 fib_index, int is_ip4)

static void	tcp_check_tx_offload (tcp_connection_t *tc, int is_ipv4)

static uword	tcp46_syn_sent_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame, int is_ip4)

VLIB_NODE_FN()	tcp4_syn_sent_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_syn_sent_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp46_rcv_process_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame, int is_ip4)
	Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED as per RFC793 p. More...

VLIB_NODE_FN()	tcp4_rcv_process_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_rcv_process_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp46_listen_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame, int is_ip4)
	LISTEN state processing as per RFC 793 p. More...

VLIB_NODE_FN()	tcp4_listen_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_listen_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static void	tcp_input_trace_frame (vlib_main_t vm, vlib_node_runtime_t node, vlib_buffer_t **bs, u32 n_bufs, u8 is_ip4)

static void	tcp_input_set_error_next (tcp_main_t tm, u16 next, u32 *error, u8 is_ip4)

static void	tcp_input_dispatch_buffer (tcp_main_t tm, tcp_connection_t tc, vlib_buffer_t b, u16 next, vlib_node_runtime_t *error_node)

static uword	tcp46_input_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *frame, int is_ip4, u8 is_nolookup)

VLIB_NODE_FN()	tcp4_input_nolookup_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_input_nolookup_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp4_input_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

VLIB_NODE_FN()	tcp6_input_node (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static void	tcp_dispatch_table_init (tcp_main_t *tm)

static clib_error_t *	tcp_input_init (vlib_main_t *vm)

Variables
static char *	tcp_error_strings []

vlib_node_registration_t	tcp4_established_node
	(constructor) VLIB_REGISTER_NODE (tcp4_established_node) More...

vlib_node_registration_t	tcp6_established_node
	(constructor) VLIB_REGISTER_NODE (tcp6_established_node) More...

vlib_node_registration_t	tcp4_syn_sent_node
	(constructor) VLIB_REGISTER_NODE (tcp4_syn_sent_node) More...

vlib_node_registration_t	tcp6_syn_sent_node
	(constructor) VLIB_REGISTER_NODE (tcp6_syn_sent_node) More...

vlib_node_registration_t	tcp4_rcv_process_node
	(constructor) VLIB_REGISTER_NODE (tcp4_rcv_process_node) More...

vlib_node_registration_t	tcp6_rcv_process_node
	(constructor) VLIB_REGISTER_NODE (tcp6_rcv_process_node) More...

vlib_node_registration_t	tcp4_listen_node
	(constructor) VLIB_REGISTER_NODE (tcp4_listen_node) More...

vlib_node_registration_t	tcp6_listen_node
	(constructor) VLIB_REGISTER_NODE (tcp6_listen_node) More...

vlib_node_registration_t	tcp4_input_nolookup_node
	(constructor) VLIB_REGISTER_NODE (tcp4_input_nolookup_node) More...

vlib_node_registration_t	tcp6_input_nolookup_node
	(constructor) VLIB_REGISTER_NODE (tcp6_input_nolookup_node) More...

vlib_node_registration_t	tcp4_input_node
	(constructor) VLIB_REGISTER_NODE (tcp4_input_node) More...

vlib_node_registration_t	tcp6_input_node
	(constructor) VLIB_REGISTER_NODE (tcp6_input_node) More...

Macro Definition Documentation

◆ filter_flags

#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)

Definition at line 2744 of file tcp_input.c.

◆ foreach_tcp4_input_next

#define foreach_tcp4_input_next

Value:

_ (DROP, "ip4-drop")                          \
  _ (LISTEN, "tcp4-listen")                     \
  _ (RCV_PROCESS, "tcp4-rcv-process")           \
  _ (SYN_SENT, "tcp4-syn-sent")                 \
  _ (ESTABLISHED, "tcp4-established")           \
  _ (RESET, "tcp4-reset")                       \
  _ (PUNT, "ip4-punt")

Definition at line 2726 of file tcp_input.c.

◆ foreach_tcp6_input_next

#define foreach_tcp6_input_next

Value:

_ (DROP, "ip6-drop")                          \
  _ (LISTEN, "tcp6-listen")                     \
  _ (RCV_PROCESS, "tcp6-rcv-process")           \
  _ (SYN_SENT, "tcp6-syn-sent")                 \
  _ (ESTABLISHED, "tcp6-established")           \
  _ (RESET, "tcp6-reset")                       \
  _ (PUNT, "ip6-punt")

Definition at line 2735 of file tcp_input.c.

◆ foreach_tcp_state_next

#define foreach_tcp_state_next

Value:

_ (DROP4, "ip4-drop")                         \
  _ (DROP6, "ip6-drop")                         \
  _ (TCP4_OUTPUT, "tcp4-output")                \
  _ (TCP6_OUTPUT, "tcp6-output")

Definition at line 31 of file tcp_input.c.

◆ tcp_error

#define tcp_error	(	n,
		s
	)	s,

◆ tcp_inc_counter

#define tcp_inc_counter	(	node_id,
		err,
		count
	)

Value:

tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index,                \
                           tcp6_##node_id##_node.index, is_ip4,         \
                           err, count)

Definition at line 1455 of file tcp_input.c.

◆ tcp_inc_err_counter

#define tcp_inc_err_counter	(	cnts,
		err,
		val
	)

Value:

{                                                                       \
  cnts[err] += val;                                                     \
}

Definition at line 1463 of file tcp_input.c.

◆ tcp_maybe_inc_counter

#define tcp_maybe_inc_counter	(	node_id,
		err,
		count
	)

Value:

{                                                                       \
  if (next0 != tcp_next_drop (is_ip4))                                  \
    tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index,            \
                            tcp6_##node_id##_node.index, is_ip4, err,   \
                            1);                                         \
}

Definition at line 1448 of file tcp_input.c.

◆ tcp_maybe_inc_err_counter

#define tcp_maybe_inc_err_counter	(	cnts,
		err
	)

Value:

{                                                                       \
  cnts[err] += (next0 != tcp_next_drop (is_ip4));                       \
}

Definition at line 1459 of file tcp_input.c.

◆ tcp_next_drop

#define tcp_next_drop ( is_ip4 )

Value:

(is_ip4 ? TCP_NEXT_DROP4 \

: TCP_NEXT_DROP6)

Definition at line 81 of file tcp_input.c.

◆ tcp_next_output

#define tcp_next_output ( is_ip4 )

Value:

(is_ip4 ? TCP_NEXT_TCP4_OUTPUT \

: TCP_NEXT_TCP6_OUTPUT)

Definition at line 78 of file tcp_input.c.

◆ tcp_store_err_counters

#define tcp_store_err_counters	(	node_id,
		cnts
	)

Value:

{                                                                       \
  int i;                                                                \
  for (i = 0; i < TCP_N_ERROR; i++)                                     \
    if (cnts[i])                                                        \
      tcp_inc_counter(node_id, i, cnts[i]);                             \
}

Definition at line 1467 of file tcp_input.c.

Typedef Documentation

◆ tcp_established_next_t

typedef enum _tcp_established_next tcp_established_next_t

◆ tcp_input_next_t

typedef enum _tcp_input_next tcp_input_next_t

◆ tcp_listen_next_t

typedef enum _tcp_listen_next tcp_listen_next_t

◆ tcp_rcv_process_next_t

typedef enum _tcp_rcv_process_next tcp_rcv_process_next_t

◆ tcp_state_next_t

typedef enum _tcp_state_next tcp_state_next_t

◆ tcp_syn_sent_next_t

typedef enum _tcp_syn_sent_next tcp_syn_sent_next_t

Function Documentation

◆ format_tcp_rx_trace()

static u8* format_tcp_rx_trace	(	u8 *	s,
		va_list *	args
	)

static

Definition at line 1358 of file tcp_input.c.

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◆ format_tcp_rx_trace_short()

static u8* format_tcp_rx_trace_short	(	u8 *	s,
		va_list *	args
	)

static

Definition at line 1374 of file tcp_input.c.

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◆ tcp46_established_inline()

static uword tcp46_established_inline	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	frame,
		int	is_ip4
	)

inlinestatic

Definition at line 1477 of file tcp_input.c.

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◆ tcp46_input_inline()

static uword tcp46_input_inline	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	frame,
		int	is_ip4,
		u8	is_nolookup
	)

inlinestatic

Definition at line 2813 of file tcp_input.c.

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◆ tcp46_listen_inline()

static uword tcp46_listen_inline	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame,
		int	is_ip4
	)

inlinestatic

LISTEN state processing as per RFC 793 p.

65

Definition at line 2543 of file tcp_input.c.

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◆ tcp46_rcv_process_inline()

static uword tcp46_rcv_process_inline	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame,
		int	is_ip4
	)

inlinestatic

Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED as per RFC793 p.

64

Definition at line 2101 of file tcp_input.c.

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◆ tcp46_syn_sent_inline()

static uword tcp46_syn_sent_inline	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame,
		int	is_ip4
	)

inlinestatic

Definition at line 1786 of file tcp_input.c.

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◆ tcp4_established_node()

VLIB_NODE_FN() tcp4_established_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 1560 of file tcp_input.c.

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◆ tcp4_input_node()

VLIB_NODE_FN() tcp4_input_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2986 of file tcp_input.c.

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◆ tcp4_input_nolookup_node()

VLIB_NODE_FN() tcp4_input_nolookup_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2930 of file tcp_input.c.

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◆ tcp4_listen_node()

VLIB_NODE_FN() tcp4_listen_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2664 of file tcp_input.c.

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◆ tcp4_rcv_process_node()

VLIB_NODE_FN() tcp4_rcv_process_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2487 of file tcp_input.c.

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◆ tcp4_syn_sent_node()

VLIB_NODE_FN() tcp4_syn_sent_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2044 of file tcp_input.c.

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◆ tcp6_established_node()

VLIB_NODE_FN() tcp6_established_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 1567 of file tcp_input.c.

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◆ tcp6_input_node()

VLIB_NODE_FN() tcp6_input_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2993 of file tcp_input.c.

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◆ tcp6_input_nolookup_node()

VLIB_NODE_FN() tcp6_input_nolookup_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2938 of file tcp_input.c.

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◆ tcp6_listen_node()

VLIB_NODE_FN() tcp6_listen_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2670 of file tcp_input.c.

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◆ tcp6_rcv_process_node()

VLIB_NODE_FN() tcp6_rcv_process_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2494 of file tcp_input.c.

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◆ tcp6_syn_sent_node()

VLIB_NODE_FN() tcp6_syn_sent_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

Definition at line 2051 of file tcp_input.c.

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◆ tcp_ack_is_cc_event()

static u8 tcp_ack_is_cc_event	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32	prev_snd_wnd,
		u32	prev_snd_una,
		u8 *	is_dack
	)

static

Checks if ack is a congestion control event.

Definition at line 973 of file tcp_input.c.

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◆ tcp_ack_is_dupack()

static u8 tcp_ack_is_dupack	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32	prev_snd_wnd,
		u32	prev_snd_una
	)

inlinestatic

Check if duplicate ack as per RFC5681 Sec.

2

Definition at line 960 of file tcp_input.c.

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◆ tcp_buffer_discard_bytes()

static int tcp_buffer_discard_bytes	(	vlib_buffer_t *	b,
		u32	n_bytes_to_drop
	)

static

Definition at line 1258 of file tcp_input.c.

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◆ tcp_cc_congestion_undo()

static void tcp_cc_congestion_undo ( tcp_connection_t * tc )

static

Definition at line 699 of file tcp_input.c.

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◆ tcp_cc_handle_event()

static void tcp_cc_handle_event	(	tcp_connection_t *	tc,
		tcp_rate_sample_t *	rs,
		u32	is_dack
	)

static

One function to rule them all ...

and in the darkness bind them

Definition at line 827 of file tcp_input.c.

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◆ tcp_cc_init_congestion()

static void tcp_cc_init_congestion ( tcp_connection_t * tc )

static

Init loss recovery/fast recovery.

Triggered by dup acks as opposed to timer timeout. Note that cwnd is updated in tcp_cc_handle_event after fast retransmit

Definition at line 673 of file tcp_input.c.

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◆ tcp_cc_is_spurious_retransmit()

static u8 tcp_cc_is_spurious_retransmit ( tcp_connection_t * tc )

inlinestatic

Definition at line 718 of file tcp_input.c.

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◆ tcp_cc_is_spurious_timeout_rxt()

static u8 tcp_cc_is_spurious_timeout_rxt ( tcp_connection_t * tc )

inlinestatic

Definition at line 709 of file tcp_input.c.

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◆ tcp_cc_recover()

static int tcp_cc_recover ( tcp_connection_t * tc )

static

Definition at line 751 of file tcp_input.c.

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◆ tcp_cc_update()

static void tcp_cc_update	(	tcp_connection_t *	tc,
		tcp_rate_sample_t *	rs
	)

static

Definition at line 803 of file tcp_input.c.

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◆ tcp_check_tx_offload()

static void tcp_check_tx_offload	(	tcp_connection_t *	tc,
		int	is_ipv4
	)

inlinestatic

Definition at line 1752 of file tcp_input.c.

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◆ tcp_dispatch_table_init()

static void tcp_dispatch_table_init ( tcp_main_t * tm )

static

Definition at line 3042 of file tcp_input.c.

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◆ tcp_established_trace_frame()

static void tcp_established_trace_frame	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	frame,
		u8	is_ip4
	)

static

Definition at line 1405 of file tcp_input.c.

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◆ tcp_estimate_initial_rtt()

static void tcp_estimate_initial_rtt ( tcp_connection_t * tc )

static

Definition at line 527 of file tcp_input.c.

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◆ tcp_estimate_rtt()

static void tcp_estimate_rtt	(	tcp_connection_t *	tc,
		u32	mrtt
	)

static

Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298.

Note that although in the original article srtt and rttvar are scaled to minimize round-off errors, here we don't. Instead, we rely on better precision time measurements.

A known limitation of the algorithm is that a drop in rtt results in a rttvar increase and bigger RTO.

mrtt must be provided in TCP_TICK multiples, i.e., in us. Note that timestamps are measured as ms ticks so they must be converted before calling this function.

Definition at line 439 of file tcp_input.c.

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◆ tcp_estimate_rtt_us()

static void tcp_estimate_rtt_us	(	tcp_connection_t *	tc,
		f64	mrtt
	)

inlinestatic

Definition at line 450 of file tcp_input.c.

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◆ tcp_handle_disconnects()

static void tcp_handle_disconnects ( tcp_worker_ctx_t * wrk )

static

Definition at line 1099 of file tcp_input.c.

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◆ tcp_handle_old_ack()

static void tcp_handle_old_ack	(	tcp_connection_t *	tc,
		tcp_rate_sample_t *	rs
	)

static

Definition at line 940 of file tcp_input.c.

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◆ tcp_handle_postponed_dequeues()

static void tcp_handle_postponed_dequeues ( tcp_worker_ctx_t * wrk )

static

Dequeue bytes for connections that have received acks in last burst.

Definition at line 562 of file tcp_input.c.

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◆ tcp_handle_rst()

static void tcp_handle_rst ( tcp_connection_t * tc )

static

Definition at line 157 of file tcp_input.c.

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◆ tcp_input_dispatch_buffer()

static void tcp_input_dispatch_buffer	(	tcp_main_t *	tm,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u16 *	next,
		vlib_node_runtime_t *	error_node
	)

inlinestatic

Definition at line 2788 of file tcp_input.c.

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◆ tcp_input_init()

static clib_error_t* tcp_input_init ( vlib_main_t * vm )

static

Definition at line 3274 of file tcp_input.c.

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◆ tcp_input_set_error_next()

static void tcp_input_set_error_next	(	tcp_main_t *	tm,
		u16 *	next,
		u32 *	error,
		u8	is_ip4
	)

static

Definition at line 2769 of file tcp_input.c.

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◆ tcp_input_trace_frame()

static void tcp_input_trace_frame	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_buffer_t **	bs,
		u32	n_bufs,
		u8	is_ip4
	)

static

Definition at line 2747 of file tcp_input.c.

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◆ tcp_lookup_connection()

static tcp_connection_t* tcp_lookup_connection	(	u32	fib_index,
		vlib_buffer_t *	b,
		u8	thread_index,
		u8	is_ip4
	)

static

Lookup transport connection.

Definition at line 1681 of file tcp_input.c.

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◆ tcp_lookup_is_valid()

static u8 tcp_lookup_is_valid	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		tcp_header_t *	hdr
	)

static

Definition at line 1614 of file tcp_input.c.

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◆ tcp_lookup_listener()

static tcp_connection_t* tcp_lookup_listener	(	vlib_buffer_t *	b,
		u32	fib_index,
		int	is_ip4
	)

static

Definition at line 1722 of file tcp_input.c.

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◆ tcp_node_inc_counter_i()

static void tcp_node_inc_counter_i	(	vlib_main_t *	vm,
		u32	tcp4_node,
		u32	tcp6_node,
		u8	is_ip4,
		u32	evt,
		u32	val
	)

inlinestatic

Definition at line 1439 of file tcp_input.c.

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◆ tcp_program_dequeue()

static void tcp_program_dequeue	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

static

Definition at line 607 of file tcp_input.c.

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◆ tcp_program_disconnect()

static void tcp_program_disconnect	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

static

Definition at line 1089 of file tcp_input.c.

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◆ tcp_program_reset_ntf()

static void tcp_program_reset_ntf	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

static

Definition at line 190 of file tcp_input.c.

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◆ tcp_rcv_ack()

static int tcp_rcv_ack	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		tcp_header_t *	th,
		u32 *	error
	)

static

Process incoming ACK.

Definition at line 988 of file tcp_input.c.

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◆ tcp_rcv_ack_no_cc()

static int tcp_rcv_ack_no_cc	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32 *	error
	)

inlinestatic

Definition at line 401 of file tcp_input.c.

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◆ tcp_rcv_fin()

static void tcp_rcv_fin	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32 *	error
	)

static

Definition at line 1133 of file tcp_input.c.

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◆ tcp_rcv_rst()

static void tcp_rcv_rst	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc
	)

static

Handle reset packet.

Programs disconnect/reset notification that should be sent later by calling tcp_handle_disconnects

Definition at line 207 of file tcp_input.c.

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◆ tcp_segment_check_paws()

static int tcp_segment_check_paws ( tcp_connection_t * tc )

inlinestatic

RFC1323: Check against wrapped sequence numbers (PAWS).

If we have timestamp to echo and it's less than tsval_recent, drop segment but still send an ACK in order to retain TCP's mechanism for detecting and recovering from half-open connections

Or at least that's what the theory says. It seems that this might not work very well with packet reordering and fast retransmit. XXX

Definition at line 128 of file tcp_input.c.

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◆ tcp_segment_in_rcv_wnd()

static u8 tcp_segment_in_rcv_wnd	(	tcp_connection_t *	tc,
		u32	seq,
		u32	end_seq
	)

inlinestatic

Validate segment sequence number.

As per RFC793:

Segment Receive Test Length Window

0 0 SEG.SEQ = RCV.NXT 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND >0 0 not acceptable >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND

This ultimately consists in checking if segment falls within the window. The one important difference compared to RFC793 is that we use rcv_las, or the rcv_nxt at last ack sent instead of rcv_nxt since that's the peer's reference when computing our receive window.

This: seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) however, is too strict when we have retransmits. Instead we just check that the seq is not beyond the right edge and that the end of the segment is not less than the left edge.

N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so use rcv_nxt in the right edge window test instead of rcv_las.

Definition at line 112 of file tcp_input.c.

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◆ tcp_segment_rcv()

static int tcp_segment_rcv	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

static

Receive buffer for connection and handle acks.

It handles both in order or out-of-order data.

Definition at line 1291 of file tcp_input.c.

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◆ tcp_segment_validate()

static int tcp_segment_validate	(	tcp_worker_ctx_t *	wrk,
		tcp_connection_t *	tc0,
		vlib_buffer_t *	b0,
		tcp_header_t *	th0,
		u32 *	error0
	)

static

Validate incoming segment as per RFC793 p.

69 and RFC1323 p. 19

It first verifies if segment has a wrapped sequence number (PAWS) and then does the processing associated to the first four steps (ignoring security and precedence): sequence number, rst bit and syn bit checks.

Returns: 0 if segments passes validation.

Definition at line 259 of file tcp_input.c.

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◆ tcp_session_enqueue_data()

static int tcp_session_enqueue_data	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u16	data_len
	)

static

Enqueue data for delivery to application.

Definition at line 1156 of file tcp_input.c.

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◆ tcp_session_enqueue_ooo()

static int tcp_session_enqueue_ooo	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u16	data_len
	)

static

Enqueue out-of-order data.

Definition at line 1207 of file tcp_input.c.

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◆ tcp_set_rx_trace_data()

static void tcp_set_rx_trace_data	(	tcp_rx_trace_t *	t0,
		tcp_connection_t *	tc0,
		tcp_header_t *	th0,
		vlib_buffer_t *	b0,
		u8	is_ip4
	)

static

Definition at line 1389 of file tcp_input.c.

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◆ tcp_should_fastrecover()

static u8 tcp_should_fastrecover	(	tcp_connection_t *	tc,
		u8	has_sack
	)

inlinestatic

Definition at line 724 of file tcp_input.c.

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◆ tcp_update_rtt()

static int tcp_update_rtt	(	tcp_connection_t *	tc,
		tcp_rate_sample_t *	rs,
		u32	ack
	)

static

Update rtt estimate.

We have potentially three sources of rtt measurements:

TSOPT difference between current and echoed timestamp. It has ms precision and can be computed per ack ACK timing one sequence number is tracked per rtt with us (micro second) precision. rate sample if enabled, all outstanding bytes are tracked with us precision. Every ack and sack are a rtt sample

Middle boxes are known to fiddle with TCP options so we give higher priority to ACK timing.

For now, rate sample rtts are only used under congestion.

Definition at line 473 of file tcp_input.c.

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◆ tcp_update_snd_wnd()

static void tcp_update_snd_wnd	(	tcp_connection_t *	tc,
		u32	seq,
		u32	ack,
		u32	snd_wnd
	)

static

Try to update snd_wnd based on feedback received from peer.

If successful, and new window is 'effectively' 0, activate persist timer.

Definition at line 624 of file tcp_input.c.

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◆ tcp_update_timestamp()

static void tcp_update_timestamp	(	tcp_connection_t *	tc,
		u32	seq,
		u32	seq_end
	)

inlinestatic

Update tsval recent.

Definition at line 138 of file tcp_input.c.

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Variable Documentation

◆ tcp4_established_node

vlib_node_registration_t tcp4_established_node

Initial value:

=
{
  .name = "tcp4-established",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_established_node)

Definition at line 1575 of file tcp_input.c.

◆ tcp4_input_node

vlib_node_registration_t tcp4_input_node

Initial value:

=
{
  .name = "tcp4-input",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_INPUT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp4_input_next
  },
  .format_buffer = format_tcp_header,
  .format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_input_node)

Definition at line 3001 of file tcp_input.c.

◆ tcp4_input_nolookup_node

vlib_node_registration_t tcp4_input_nolookup_node

Initial value:

=
{
  .name = "tcp4-input-nolookup",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_INPUT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp4_input_next
  },
  .format_buffer = format_tcp_header,
  .format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_input_nolookup_node)

Definition at line 2947 of file tcp_input.c.

◆ tcp4_listen_node

vlib_node_registration_t tcp4_listen_node

Initial value:

=
{
  .name = "tcp4-listen",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_LISTEN_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_listen_node)

Definition at line 2677 of file tcp_input.c.

◆ tcp4_rcv_process_node

vlib_node_registration_t tcp4_rcv_process_node

Initial value:

=
{
  .name = "tcp4-rcv-process",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_rcv_process_node)

Definition at line 2502 of file tcp_input.c.

◆ tcp4_syn_sent_node

vlib_node_registration_t tcp4_syn_sent_node

Initial value:

=
{
  .name = "tcp4-syn-sent",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_SYN_SENT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_syn_sent_node)

Definition at line 2059 of file tcp_input.c.

◆ tcp6_established_node

vlib_node_registration_t tcp6_established_node

Initial value:

=
{
  .name = "tcp6-established",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_established_node)

Definition at line 1594 of file tcp_input.c.

◆ tcp6_input_node

vlib_node_registration_t tcp6_input_node

Initial value:

=
{
  .name = "tcp6-input",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_INPUT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp6_input_next
  },
  .format_buffer = format_tcp_header,
  .format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_input_node)

Definition at line 3021 of file tcp_input.c.

◆ tcp6_input_nolookup_node

vlib_node_registration_t tcp6_input_nolookup_node

Initial value:

=
{
  .name = "tcp6-input-nolookup",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_INPUT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp6_input_next
  },
  .format_buffer = format_tcp_header,
  .format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_input_nolookup_node)

Definition at line 2967 of file tcp_input.c.

◆ tcp6_listen_node

vlib_node_registration_t tcp6_listen_node

Initial value:

=
{
  .name = "tcp6-listen",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_LISTEN_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_listen_node)

Definition at line 2696 of file tcp_input.c.

◆ tcp6_rcv_process_node

vlib_node_registration_t tcp6_rcv_process_node

Initial value:

=
{
  .name = "tcp6-rcv-process",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_rcv_process_node)

Definition at line 2521 of file tcp_input.c.

◆ tcp6_syn_sent_node

vlib_node_registration_t tcp6_syn_sent_node

Initial value:

=
{
  .name = "tcp6-syn-sent",
  
  .vector_size = sizeof (u32),
  .n_errors = TCP_N_ERROR,
  .error_strings = tcp_error_strings,
  .n_next_nodes = TCP_SYN_SENT_N_NEXT,
  .next_nodes =
  {
#define _(s,n) 
    foreach_tcp_state_next
  },
  .format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_syn_sent_node)

Definition at line 2078 of file tcp_input.c.

◆ tcp_error_strings

char* tcp_error_strings[]

static

Initial value:

= {
#define tcp_error(n,s) 
}

Definition at line 24 of file tcp_input.c.

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ filter_flags

◆ foreach_tcp4_input_next

◆ foreach_tcp6_input_next

◆ foreach_tcp_state_next

◆ tcp_error

◆ tcp_inc_counter

◆ tcp_inc_err_counter

◆ tcp_maybe_inc_counter

◆ tcp_maybe_inc_err_counter

◆ tcp_next_drop

◆ tcp_next_output

◆ tcp_store_err_counters

Typedef Documentation

◆ tcp_established_next_t

◆ tcp_input_next_t

◆ tcp_listen_next_t

◆ tcp_rcv_process_next_t

◆ tcp_state_next_t

◆ tcp_syn_sent_next_t

Function Documentation

◆ format_tcp_rx_trace()

◆ format_tcp_rx_trace_short()

◆ tcp46_established_inline()

◆ tcp46_input_inline()

◆ tcp46_listen_inline()

◆ tcp46_rcv_process_inline()

◆ tcp46_syn_sent_inline()

◆ tcp4_established_node()

◆ tcp4_input_node()

◆ tcp4_input_nolookup_node()

◆ tcp4_listen_node()

◆ tcp4_rcv_process_node()

◆ tcp4_syn_sent_node()

◆ tcp6_established_node()

◆ tcp6_input_node()

◆ tcp6_input_nolookup_node()

◆ tcp6_listen_node()

◆ tcp6_rcv_process_node()

◆ tcp6_syn_sent_node()

◆ tcp_ack_is_cc_event()

◆ tcp_ack_is_dupack()

◆ tcp_buffer_discard_bytes()

◆ tcp_cc_congestion_undo()

◆ tcp_cc_handle_event()

◆ tcp_cc_init_congestion()

◆ tcp_cc_is_spurious_retransmit()

◆ tcp_cc_is_spurious_timeout_rxt()

◆ tcp_cc_recover()

◆ tcp_cc_update()

◆ tcp_check_tx_offload()

◆ tcp_dispatch_table_init()

◆ tcp_established_trace_frame()

◆ tcp_estimate_initial_rtt()

◆ tcp_estimate_rtt()

◆ tcp_estimate_rtt_us()

◆ tcp_handle_disconnects()

◆ tcp_handle_old_ack()

◆ tcp_handle_postponed_dequeues()

◆ tcp_handle_rst()

◆ tcp_input_dispatch_buffer()

◆ tcp_input_init()

◆ tcp_input_set_error_next()

◆ tcp_input_trace_frame()

◆ tcp_lookup_connection()

◆ tcp_lookup_is_valid()

◆ tcp_lookup_listener()

◆ tcp_node_inc_counter_i()

◆ tcp_program_dequeue()

◆ tcp_program_disconnect()

◆ tcp_program_reset_ntf()

◆ tcp_rcv_ack()

◆ tcp_rcv_ack_no_cc()

◆ tcp_rcv_fin()

◆ tcp_rcv_rst()