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_options_parse (tcp_header_t th, tcp_options_t to)
	Parse TCP header options. 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 int	tcp_segment_validate (vlib_main_t vm, tcp_connection_t tc0, vlib_buffer_t b0, tcp_header_t th0, u32 next0, u32 error0)
	Validate incoming segment as per RFC793 p. More...

static int	tcp_rcv_ack_is_acceptable (tcp_connection_t tc0, vlib_buffer_t tb0)

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

void	tcp_update_rto (tcp_connection_t *tc)

static int	tcp_update_rtt (tcp_connection_t *tc, u32 ack)
	Update RTT estimate and RTO timer. More...

static void	tcp_dequeue_acked (tcp_connection_t *tc, u32 ack)
	Dequeue bytes that have been acked and while at it update RTT estimates. More...

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 u32	scoreboard_hole_index (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

static u32	scoreboard_hole_bytes (sack_scoreboard_hole_t *hole)

sack_scoreboard_hole_t *	scoreboard_get_hole (sack_scoreboard_t *sb, u32 index)

sack_scoreboard_hole_t *	scoreboard_next_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

sack_scoreboard_hole_t *	scoreboard_prev_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

sack_scoreboard_hole_t *	scoreboard_first_hole (sack_scoreboard_t *sb)

sack_scoreboard_hole_t *	scoreboard_last_hole (sack_scoreboard_t *sb)

static void	scoreboard_remove_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t hole)

static sack_scoreboard_hole_t *	scoreboard_insert_hole (sack_scoreboard_t *sb, u32 prev_index, u32 start, u32 end)

static void	scoreboard_update_bytes (tcp_connection_t tc, sack_scoreboard_t sb)

sack_scoreboard_hole_t *	scoreboard_next_rxt_hole (sack_scoreboard_t sb, sack_scoreboard_hole_t start, u8 have_sent_1_smss, u8 can_rescue, u8 snd_limited)
	Figure out the next hole to retransmit. More...

static void	scoreboard_init_high_rxt (sack_scoreboard_t *sb, u32 seq)

void	scoreboard_init (sack_scoreboard_t *sb)

void	scoreboard_clear (sack_scoreboard_t *sb)

static u8	tcp_scoreboard_is_sane_post_recovery (tcp_connection_t *tc)
	Test that scoreboard is sane after recovery. More...

void	tcp_rcv_sacks (tcp_connection_t *tc, u32 ack)

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...

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

static void	tcp_cc_recovery_exit (tcp_connection_t *tc)

void	tcp_cc_fastrecovery_exit (tcp_connection_t *tc)

static void	tcp_cc_congestion_undo (tcp_connection_t *tc)

static u8	tcp_cc_is_spurious_retransmit (tcp_connection_t *tc)

static int	tcp_cc_recover (tcp_connection_t *tc)

static void	tcp_cc_update (tcp_connection_t tc, vlib_buffer_t b)

static u8	tcp_should_fastrecover_sack (tcp_connection_t *tc)

static u8	tcp_should_fastrecover (tcp_connection_t *tc)

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

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

static u8	tcp_sack_vector_is_sane (sack_block_t *sacks)

void	tcp_update_sack_list (tcp_connection_t *tc, u32 start, u32 end)
	Build SACK list as per RFC2018. More...

u32	tcp_sack_list_bytes (tcp_connection_t *tc)

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_can_delack (tcp_connection_t *tc)
	Check if ACK could be delayed. More...

static int	tcp_buffer_discard_bytes (vlib_buffer_t *b, u32 n_bytes_to_drop)

static int	tcp_segment_rcv (tcp_connection_t tc, vlib_buffer_t b, u32 *next0)
	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)

static uword	tcp4_established (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp6_established (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_established_node, tcp4_established)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established)

static u8	tcp_lookup_is_valid (tcp_connection_t tc, 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 uword	tcp46_syn_sent_inline (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame, int is_ip4)

static uword	tcp4_syn_sent (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp6_syn_sent_rcv (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_syn_sent_node, tcp4_syn_sent)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv)

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...

static uword	tcp4_rcv_process (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp6_rcv_process (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_rcv_process_node, tcp4_rcv_process)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_rcv_process_node, tcp6_rcv_process)

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...

static uword	tcp4_listen (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp6_listen (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_listen_node, tcp4_listen)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_listen_node, tcp6_listen)

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 tcp_connection_t *	tcp_input_lookup_buffer (vlib_buffer_t b, u8 thread_index, 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, u32 *error)

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

static uword	tcp4_input (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

static uword	tcp6_input (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *from_frame)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp4_input_node, tcp4_input)

	VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input)

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_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

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

Definition at line 3142 of file tcp_input.c.

#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 3124 of file tcp_input.c.

#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 3133 of file tcp_input.c.

#define foreach_tcp_state_next

Value:

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

Definition at line 29 of file tcp_input.c.

#define tcp_error	(	n,
		s
	)	s,

#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 1850 of file tcp_input.c.

#define tcp_inc_err_counter	(	cnts,
		err,
		val
	)

Value:

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

Definition at line 1858 of file tcp_input.c.

#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 1843 of file tcp_input.c.

#define tcp_maybe_inc_err_counter	(	cnts,
		err
	)

Value:

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

Definition at line 1854 of file tcp_input.c.

#define tcp_next_drop ( is_ip4 )

Value:

(is_ip4 ? TCP_NEXT_DROP4 \

: TCP_NEXT_DROP6)

Definition at line 79 of file tcp_input.c.

#define tcp_next_output ( is_ip4 )

Value:

(is_ip4 ? TCP_NEXT_TCP4_OUTPUT \

: TCP_NEXT_TCP6_OUTPUT)

Definition at line 76 of file tcp_input.c.

#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 1862 of file tcp_input.c.

Typedef Documentation

typedef enum _tcp_established_next tcp_established_next_t

typedef enum _tcp_input_next tcp_input_next_t

typedef enum _tcp_listen_next tcp_listen_next_t

typedef enum _tcp_rcv_process_next tcp_rcv_process_next_t

typedef enum _tcp_state_next tcp_state_next_t

typedef enum _tcp_syn_sent_next tcp_syn_sent_next_t

Function Documentation

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

static

Definition at line 1754 of file tcp_input.c.

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

static

Definition at line 1770 of file tcp_input.c.

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void scoreboard_clear ( sack_scoreboard_t * sb )

Definition at line 794 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_first_hole ( sack_scoreboard_t * sb )

Definition at line 580 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_get_hole	(	sack_scoreboard_t *	sb,
		u32	index
	)

Definition at line 556 of file tcp_input.c.

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static u32 scoreboard_hole_bytes ( sack_scoreboard_hole_t * hole )

static

Definition at line 550 of file tcp_input.c.

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static u32 scoreboard_hole_index	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

static

Definition at line 543 of file tcp_input.c.

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void scoreboard_init ( sack_scoreboard_t * sb )

Definition at line 786 of file tcp_input.c.

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static void scoreboard_init_high_rxt	(	sack_scoreboard_t *	sb,
		u32	seq
	)

static

Definition at line 773 of file tcp_input.c.

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static sack_scoreboard_hole_t* scoreboard_insert_hole	(	sack_scoreboard_t *	sb,
		u32	prev_index,
		u32	start,
		u32	end
	)

static

Definition at line 631 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_last_hole ( sack_scoreboard_t * sb )

Definition at line 588 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_next_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

Definition at line 564 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_next_rxt_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	start,
		u8	have_sent_1_smss,
		u8 *	can_rescue,
		u8 *	snd_limited
	)

Figure out the next hole to retransmit.

Follows logic proposed in RFC6675 Sec. 4, NextSeg()

Definition at line 718 of file tcp_input.c.

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sack_scoreboard_hole_t* scoreboard_prev_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

Definition at line 572 of file tcp_input.c.

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static void scoreboard_remove_hole	(	sack_scoreboard_t *	sb,
		sack_scoreboard_hole_t *	hole
	)

static

Definition at line 596 of file tcp_input.c.

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static void scoreboard_update_bytes	(	tcp_connection_t *	tc,
		sack_scoreboard_t *	sb
	)

static

Definition at line 668 of file tcp_input.c.

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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 1872 of file tcp_input.c.

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

inlinestatic

Definition at line 3274 of file tcp_input.c.

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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 2889 of file tcp_input.c.

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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 2467 of file tcp_input.c.

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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 2138 of file tcp_input.c.

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static uword tcp4_established	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 1997 of file tcp_input.c.

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static uword tcp4_input	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 3380 of file tcp_input.c.

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static uword tcp4_listen	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 3052 of file tcp_input.c.

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static uword tcp4_rcv_process	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 2825 of file tcp_input.c.

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static uword tcp4_syn_sent	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 2402 of file tcp_input.c.

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static uword tcp6_established	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 2004 of file tcp_input.c.

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static uword tcp6_input	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 3387 of file tcp_input.c.

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static uword tcp6_listen	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 3059 of file tcp_input.c.

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static uword tcp6_rcv_process	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 2832 of file tcp_input.c.

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static uword tcp6_syn_sent_rcv	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	from_frame
	)

static

Definition at line 2409 of file tcp_input.c.

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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 531 of file tcp_input.c.

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

static

Check if duplicate ack as per RFC5681 Sec.

2

Definition at line 518 of file tcp_input.c.

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static int tcp_buffer_discard_bytes	(	vlib_buffer_t *	b,
		u32	n_bytes_to_drop
	)

static

Definition at line 1646 of file tcp_input.c.

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static int tcp_can_delack ( tcp_connection_t * tc )

inlinestatic

Check if ACK could be delayed.

If ack can be delayed, it should return true for a full frame. If we're always acking return 0.

Definition at line 1630 of file tcp_input.c.

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static void tcp_cc_congestion_undo ( tcp_connection_t * tc )

static

Definition at line 1083 of file tcp_input.c.

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void tcp_cc_fastrecovery_exit ( tcp_connection_t * tc )

Definition at line 1071 of file tcp_input.c.

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static void tcp_cc_handle_event	(	tcp_connection_t *	tc,
		u32	is_dack
	)

static

One function to rule them all ...

and in the darkness bind them

Definition at line 1165 of file tcp_input.c.

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void tcp_cc_init_congestion ( tcp_connection_t * tc )

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 1050 of file tcp_input.c.

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static u8 tcp_cc_is_spurious_retransmit ( tcp_connection_t * tc )

static

Definition at line 1097 of file tcp_input.c.

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static int tcp_cc_recover ( tcp_connection_t * tc )

static

Definition at line 1106 of file tcp_input.c.

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static void tcp_cc_recovery_exit ( tcp_connection_t * tc )

static

Definition at line 1060 of file tcp_input.c.

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static void tcp_cc_update	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b
	)

static

Definition at line 1127 of file tcp_input.c.

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static void tcp_dequeue_acked	(	tcp_connection_t *	tc,
		u32	ack
	)

static

Dequeue bytes that have been acked and while at it update RTT estimates.

Definition at line 498 of file tcp_input.c.

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static void tcp_dispatch_table_init ( tcp_main_t * tm )

static

Definition at line 3440 of file tcp_input.c.

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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 1800 of file tcp_input.c.

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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 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.

TODO support us rtt resolution

Definition at line 409 of file tcp_input.c.

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static void tcp_input_dispatch_buffer	(	tcp_main_t *	tm,
		tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u16 *	next,
		u32 *	error
	)

inlinestatic

Definition at line 3249 of file tcp_input.c.

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static clib_error_t* tcp_input_init ( vlib_main_t * vm )

static

Definition at line 3524 of file tcp_input.c.

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static tcp_connection_t* tcp_input_lookup_buffer	(	vlib_buffer_t *	b,
		u8	thread_index,
		u32 *	error,
		u8	is_ip4
	)

inlinestatic

Definition at line 3186 of file tcp_input.c.

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

static

Definition at line 3167 of file tcp_input.c.

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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 3145 of file tcp_input.c.

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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 2097 of file tcp_input.c.

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

static

Definition at line 2059 of file tcp_input.c.

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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 1834 of file tcp_input.c.

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

static

Parse TCP header options.

Parameters

th	TCP header
to	TCP options data structure to be populated

Returns: -1 if parsing failed

Definition at line 127 of file tcp_input.c.

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

static

Process incoming ACK.

Definition at line 1335 of file tcp_input.c.

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static int tcp_rcv_ack_is_acceptable	(	tcp_connection_t *	tc0,
		vlib_buffer_t *	tb0
	)

inlinestatic

Definition at line 392 of file tcp_input.c.

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void tcp_rcv_sacks	(	tcp_connection_t *	tc,
		u32	ack
	)

Definition at line 829 of file tcp_input.c.

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u32 tcp_sack_list_bytes ( tcp_connection_t * tc )

Definition at line 1511 of file tcp_input.c.

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static u8 tcp_sack_vector_is_sane ( sack_block_t * sacks )

static

Definition at line 1434 of file tcp_input.c.

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static u8 tcp_scoreboard_is_sane_post_recovery ( tcp_connection_t * tc )

static

Test that scoreboard is sane after recovery.

Returns 1 if scoreboard is empty or if first hole beyond snd_una.

Definition at line 820 of file tcp_input.c.

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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 237 of file tcp_input.c.

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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 113 of file tcp_input.c.

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static int tcp_segment_rcv	(	tcp_connection_t *	tc,
		vlib_buffer_t *	b,
		u32 *	next0
	)

static

Receive buffer for connection and handle acks.

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

Definition at line 1679 of file tcp_input.c.

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static int tcp_segment_validate	(	vlib_main_t *	vm,
		tcp_connection_t *	tc0,
		vlib_buffer_t *	b0,
		tcp_header_t *	th0,
		u32 *	next0,
		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 275 of file tcp_input.c.

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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 1521 of file tcp_input.c.

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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 1576 of file tcp_input.c.

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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 1785 of file tcp_input.c.

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static u8 tcp_should_fastrecover ( tcp_connection_t * tc )

static

Definition at line 1155 of file tcp_input.c.

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static u8 tcp_should_fastrecover_sack ( tcp_connection_t * tc )

static

Definition at line 1149 of file tcp_input.c.

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void tcp_update_rto ( tcp_connection_t * tc )

Definition at line 432 of file tcp_input.c.

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static int tcp_update_rtt	(	tcp_connection_t *	tc,
		u32	ack
	)

static

Update RTT estimate and RTO timer.

Measure RTT: We have two sources of RTT measurements: TSOPT and ACK timing. Middle boxes are known to fiddle with TCP options so we should give higher priority to ACK timing.

This should be called only if previously sent bytes have been acked.

return 1 if valid rtt 0 otherwise

Definition at line 450 of file tcp_input.c.

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void tcp_update_sack_list	(	tcp_connection_t *	tc,
		u32	start,
		u32	end
	)

Build SACK list as per RFC2018.

Makes sure the first block contains the segment that generated the current ACK and the following ones are the ones most recently reported in SACK blocks.

Parameters

tc	TCP connection for which the SACK list is updated
start	Start sequence number of the newest SACK block
end	End sequence of the newest SACK block

Definition at line 1457 of file tcp_input.c.

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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 1012 of file tcp_input.c.

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

inlinestatic

Update tsval recent.

Definition at line 247 of file tcp_input.c.

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VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_established_node	,
		tcp4_established
	)

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VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_established_node	,
		tcp6_established
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_syn_sent_node	,
		tcp4_syn_sent
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_syn_sent_node	,
		tcp6_syn_sent_rcv
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_rcv_process_node	,
		tcp4_rcv_process
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_rcv_process_node	,
		tcp6_rcv_process
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_listen_node	,
		tcp4_listen
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_listen_node	,
		tcp6_listen
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp4_input_node	,
		tcp4_input
	)

VLIB_NODE_FUNCTION_MULTIARCH	(	tcp6_input_node	,
		tcp6_input
	)

Variable Documentation

vlib_node_registration_t tcp4_established_node

Initial value:

=
{
  .function = tcp4_established,
  .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 82 of file tcp_input.c.

vlib_node_registration_t tcp4_input_node

Initial value:

=
{
  .function = tcp4_input,
  .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 3109 of file tcp_input.c.

vlib_node_registration_t tcp4_listen_node

Initial value:

=
{
  .function = tcp4_listen,
  .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 2882 of file tcp_input.c.

vlib_node_registration_t tcp4_rcv_process_node

Initial value:

=
{
  .function = tcp4_rcv_process,
  .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 2459 of file tcp_input.c.

vlib_node_registration_t tcp4_syn_sent_node

Initial value:

=
{
  .function = tcp4_syn_sent,
  .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 2055 of file tcp_input.c.

vlib_node_registration_t tcp6_established_node

Initial value:

=
{
  .function = tcp6_established,
  .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 83 of file tcp_input.c.

vlib_node_registration_t tcp6_input_node

Initial value:

=
{
  .function = tcp6_input,
  .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 3110 of file tcp_input.c.

vlib_node_registration_t tcp6_listen_node

Initial value:

=
{
  .function = tcp6_listen,
  .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 2883 of file tcp_input.c.

vlib_node_registration_t tcp6_rcv_process_node

Initial value:

=
{
  .function = tcp6_rcv_process,
  .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 2460 of file tcp_input.c.

vlib_node_registration_t tcp6_syn_sent_node

Initial value:

=
{
  .function = tcp6_syn_sent_rcv,
  .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 2056 of file tcp_input.c.

char* tcp_error_strings[]

static

Initial value:

= {
#define tcp_error(n,s) 
}

Definition at line 22 of file tcp_input.c.

Data Structures

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation