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Vector Packet Processing
tcp_input.c File Reference
+ Include dependency graph for tcp_input.c:

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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 u8format_tcp_rx_trace (u8 *s, va_list *args)
 
static u8format_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_ttcp_lookup_connection (u32 fib_index, vlib_buffer_t *b, u8 thread_index, u8 is_ip4)
 Lookup transport connection. More...
 
static tcp_connection_ttcp_lookup_listener (vlib_buffer_t *b, u32 fib_index, int is_ip4)
 
static void tcp46_syn_sent_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, u32 *from, u32 n_bufs)
 
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 *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 void tcp46_rcv_process_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, u32 *from, u32 n_bufs)
 
static uword tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *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 void tcp46_listen_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, u32 *to_next, u32 n_bufs)
 
static uword tcp46_listen_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *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)
 
void tcp_check_gso (tcp_connection_t *tc)
 
static void tcp_dispatch_table_init (tcp_main_t *tm)
 
static clib_error_ttcp_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 2788 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 2770 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 2779 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,

◆ 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 1453 of file tcp_input.c.

◆ tcp_inc_err_counter

#define tcp_inc_err_counter (   cnts,
  err,
  val 
)
Value:
{ \
cnts[err] += val; \
}

Definition at line 1461 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 1446 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 1457 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 1465 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 1356 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 1372 of file tcp_input.c.

◆ 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 1475 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 2861 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 frame,
int  is_ip4 
)
inlinestatic

LISTEN state processing as per RFC 793 p.

65

Definition at line 2593 of file tcp_input.c.

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◆ tcp46_listen_trace_frame()

static void tcp46_listen_trace_frame ( vlib_main_t vm,
vlib_node_runtime_t node,
u32 to_next,
u32  n_bufs 
)
static

Definition at line 2569 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 frame,
int  is_ip4 
)
inlinestatic

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

64

Definition at line 2130 of file tcp_input.c.

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◆ tcp46_rcv_process_trace_frame()

static void tcp46_rcv_process_trace_frame ( vlib_main_t vm,
vlib_node_runtime_t node,
u32 from,
u32  n_bufs 
)
static

Definition at line 2104 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 frame,
int  is_ip4 
)
inlinestatic

Definition at line 1804 of file tcp_input.c.

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◆ tcp46_syn_sent_trace_frame()

static void tcp46_syn_sent_trace_frame ( vlib_main_t vm,
vlib_node_runtime_t node,
u32 from,
u32  n_bufs 
)
static

Definition at line 1749 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 1557 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 3034 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 2978 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 2708 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 2516 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 2051 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 1564 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 3041 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 2986 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 2714 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 2523 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 2058 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 967 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 954 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 1252 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 693 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 821 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 667 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 712 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 703 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 745 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 797 of file tcp_input.c.

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◆ tcp_check_gso()

void tcp_check_gso ( tcp_connection_t tc)

Definition at line 3090 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 1770 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 3096 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 1403 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 1093 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 934 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 2832 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 3328 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 2813 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 2791 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 1678 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 1611 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 1719 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 1437 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 601 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 1083 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 982 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 1127 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 1285 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 1150 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 1201 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 1387 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 718 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 618 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_established_node)

Definition at line 1572 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)
},
.format_buffer = format_tcp_header,
.format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_input_node)

Definition at line 3049 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)
},
.format_buffer = format_tcp_header,
.format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp4_input_nolookup_node)

Definition at line 2995 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_listen_node)

Definition at line 2721 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_rcv_process_node)

Definition at line 2531 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp4_syn_sent_node)

Definition at line 2066 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_established_node)

Definition at line 1591 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)
},
.format_buffer = format_tcp_header,
.format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_input_node)

Definition at line 3069 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)
},
.format_buffer = format_tcp_header,
.format_trace = format_tcp_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (tcp6_input_nolookup_node)

Definition at line 3015 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_listen_node)

Definition at line 2740 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_rcv_process_node)

Definition at line 2550 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)
},
.format_trace = format_tcp_rx_trace_short,
}

(constructor) VLIB_REGISTER_NODE (tcp6_syn_sent_node)

Definition at line 2085 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.

TCP_ESTABLISHED_N_NEXT
@ TCP_ESTABLISHED_N_NEXT
Definition: tcp_input.c:42
TCP_RCV_PROCESS_N_NEXT
@ TCP_RCV_PROCESS_N_NEXT
Definition: tcp_input.c:50
format_tcp_rx_trace
static u8 * format_tcp_rx_trace(u8 *s, va_list *args)
Definition: tcp_input.c:1356
tcp_next_drop
#define tcp_next_drop(is_ip4)
Definition: tcp_input.c:81
DROP
DROP
Definition: error.def:41
format_tcp_header
format_function_t format_tcp_header
Definition: format.h:100
foreach_tcp_state_next
#define foreach_tcp_state_next
Definition: tcp_input.c:31
vm
vlib_main_t * vm
X-connect all packets from the HOST to the PHY.
Definition: nat44_ei.c:3047
count
u8 count
Definition: dhcp.api:208
tcp_error_strings
static char * tcp_error_strings[]
Definition: tcp_input.c:24
TCP_INPUT_N_NEXT
@ TCP_INPUT_N_NEXT
Definition: tcp_input.c:2767
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)
Definition: tcp_input.c:1437
TCP_LISTEN_N_NEXT
@ TCP_LISTEN_N_NEXT
Definition: tcp_input.c:66
u32
unsigned int u32
Definition: types.h:88
TCP_N_ERROR
@ TCP_N_ERROR
Definition: tcp.h:40
format_tcp_rx_trace_short
static u8 * format_tcp_rx_trace_short(u8 *s, va_list *args)
Definition: tcp_input.c:1372
foreach_tcp4_input_next
#define foreach_tcp4_input_next
Definition: tcp_input.c:2770
i
int i
Definition: flowhash_template.h:376
TCP_SYN_SENT_N_NEXT
@ TCP_SYN_SENT_N_NEXT
Definition: tcp_input.c:58
foreach_tcp6_input_next
#define foreach_tcp6_input_next
Definition: tcp_input.c:2779