/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
-#include <vnet/tcp/tcp_packet.h>
-#include <vnet/tcp/tcp_timer.h>
-#include <vnet/session/transport.h>
#include <vnet/session/session.h>
+#include <vnet/tcp/tcp_types.h>
+#include <vnet/tcp/tcp_timer.h>
#include <vnet/tcp/tcp_debug.h>
+#include <vnet/tcp/tcp_sack.h>
+#include <vnet/tcp/tcp_bt.h>
+#include <vnet/tcp/tcp_cc.h>
-#define TCP_TICK 0.001 /**< TCP tick period (s) */
-#define THZ (u32) (1/TCP_TICK) /**< TCP tick frequency */
-#define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */
-#define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
-#define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
-#define TCP_MAX_OPTION_SPACE 40
-#define TCP_CC_DATA_SZ 20
-
-#define TCP_DUPACK_THRESHOLD 3
-#define TCP_MAX_RX_FIFO_SIZE 32 << 20
-#define TCP_MIN_RX_FIFO_SIZE 4 << 10
-#define TCP_IW_N_SEGMENTS 10
-#define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */
-#define TCP_USE_SACKS 1 /**< Disable only for testing */
-
-/** TCP FSM state definitions as per RFC793. */
-#define foreach_tcp_fsm_state \
- _(CLOSED, "CLOSED") \
- _(LISTEN, "LISTEN") \
- _(SYN_SENT, "SYN_SENT") \
- _(SYN_RCVD, "SYN_RCVD") \
- _(ESTABLISHED, "ESTABLISHED") \
- _(CLOSE_WAIT, "CLOSE_WAIT") \
- _(FIN_WAIT_1, "FIN_WAIT_1") \
- _(LAST_ACK, "LAST_ACK") \
- _(CLOSING, "CLOSING") \
- _(FIN_WAIT_2, "FIN_WAIT_2") \
- _(TIME_WAIT, "TIME_WAIT")
-
-typedef enum _tcp_state
-{
-#define _(sym, str) TCP_STATE_##sym,
- foreach_tcp_fsm_state
-#undef _
- TCP_N_STATES
-} tcp_state_t;
-
-format_function_t format_tcp_state;
-format_function_t format_tcp_flags;
-format_function_t format_tcp_sacks;
-format_function_t format_tcp_rcv_sacks;
+typedef void (timer_expiration_handler) (tcp_connection_t * tc);
-/** TCP timers */
-#define foreach_tcp_timer \
- _(RETRANSMIT, "RETRANSMIT") \
- _(DELACK, "DELAYED ACK") \
- _(PERSIST, "PERSIST") \
- _(KEEP, "KEEP") \
- _(WAITCLOSE, "WAIT CLOSE") \
- _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
- _(ESTABLISH, "ESTABLISH")
-
-typedef enum _tcp_timers
-{
-#define _(sym, str) TCP_TIMER_##sym,
- foreach_tcp_timer
-#undef _
- TCP_N_TIMERS
-} tcp_timers_e;
-
-typedef void (timer_expiration_handler) (u32 index);
-
-extern timer_expiration_handler tcp_timer_delack_handler;
extern timer_expiration_handler tcp_timer_retransmit_handler;
extern timer_expiration_handler tcp_timer_persist_handler;
extern timer_expiration_handler tcp_timer_retransmit_syn_handler;
-#define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
-
-/* Timer delays as multiples of 100ms */
-#define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP
- * ticks to timer units */
-#define TCP_DELACK_TIME 1 /* 0.1s */
-#define TCP_ESTABLISH_TIME 750 /* 75s */
-#define TCP_SYN_RCVD_TIME 600 /* 60s */
-#define TCP_2MSL_TIME 300 /* 30s */
-#define TCP_CLOSEWAIT_TIME 20 /* 2s */
-#define TCP_TIMEWAIT_TIME 100 /* 10s */
-#define TCP_CLEANUP_TIME 10 /* 1s Time to wait before cleanup */
-#define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */
-
-#define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
-#define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
-#define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
-#define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
-#define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
-
-/** TCP connection flags */
-#define foreach_tcp_connection_flag \
- _(SNDACK, "Send ACK") \
- _(FINSNT, "FIN sent") \
- _(SENT_RCV_WND0, "Sent 0 rcv_wnd") \
- _(RECOVERY, "Recovery") \
- _(FAST_RECOVERY, "Fast Recovery") \
- _(FR_1_SMSS, "Sent 1 SMSS") \
- _(HALF_OPEN_DONE, "Half-open completed") \
- _(FINPNDG, "FIN pending") \
- _(FRXT_PENDING, "Fast-retransmit pending") \
- _(FRXT_FIRST, "Fast-retransmit first again") \
- _(DEQ_PENDING, "Pending dequeue acked") \
-
-typedef enum _tcp_connection_flag_bits
-{
-#define _(sym, str) TCP_CONN_##sym##_BIT,
- foreach_tcp_connection_flag
-#undef _
- TCP_CONN_N_FLAG_BITS
-} tcp_connection_flag_bits_e;
-
-typedef enum _tcp_connection_flag
-{
-#define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
- foreach_tcp_connection_flag
-#undef _
- TCP_CONN_N_FLAGS
-} tcp_connection_flags_e;
-
-/** TCP buffer flags */
-#define foreach_tcp_buf_flag \
- _ (ACK) /**< Sending ACK. */ \
- _ (DUPACK) /**< Sending DUPACK. */ \
-
-enum
-{
-#define _(f) TCP_BUF_BIT_##f,
- foreach_tcp_buf_flag
-#undef _
- TCP_N_BUF_BITS,
-};
-
-enum
-{
-#define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f,
- foreach_tcp_buf_flag
-#undef _
-};
-
-#define TCP_SCOREBOARD_TRACE (0)
-#define TCP_MAX_SACK_BLOCKS 256 /**< Max number of SACK blocks stored */
-#define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
-
-typedef struct _scoreboard_trace_elt
-{
- u32 start;
- u32 end;
- u32 ack;
- u32 snd_una_max;
- u32 group;
-} scoreboard_trace_elt_t;
-
-typedef struct _sack_scoreboard_hole
-{
- u32 next; /**< Index for next entry in linked list */
- u32 prev; /**< Index for previous entry in linked list */
- u32 start; /**< Start sequence number */
- u32 end; /**< End sequence number */
- u8 is_lost; /**< Mark hole as lost */
-} sack_scoreboard_hole_t;
-
-typedef struct _sack_scoreboard
-{
- sack_scoreboard_hole_t *holes; /**< Pool of holes */
- u32 head; /**< Index of first entry */
- u32 tail; /**< Index of last entry */
- u32 sacked_bytes; /**< Number of bytes sacked in sb */
- u32 last_sacked_bytes; /**< Number of bytes last sacked */
- u32 last_bytes_delivered; /**< Number of sack bytes delivered */
- u32 snd_una_adv; /**< Bytes to add to snd_una */
- u32 high_sacked; /**< Highest byte sacked (fack) */
- u32 high_rxt; /**< Highest retransmitted sequence */
- u32 rescue_rxt; /**< Rescue sequence number */
- u32 lost_bytes; /**< Bytes lost as per RFC6675 */
- u32 cur_rxt_hole; /**< Retransmitting from this hole */
-
-#if TCP_SCOREBOARD_TRACE
- scoreboard_trace_elt_t *trace;
-#endif
-
-} sack_scoreboard_t;
-
-#if TCP_SCOREBOARD_TRACE
-#define tcp_scoreboard_trace_add(_tc, _ack) \
-{ \
- static u64 _group = 0; \
- sack_scoreboard_t *_sb = &_tc->sack_sb; \
- sack_block_t *_sack, *_sacks; \
- scoreboard_trace_elt_t *_elt; \
- int i; \
- _group++; \
- _sacks = _tc->rcv_opts.sacks; \
- for (i = 0; i < vec_len (_sacks); i++) \
- { \
- _sack = &_sacks[i]; \
- vec_add2 (_sb->trace, _elt, 1); \
- _elt->start = _sack->start; \
- _elt->end = _sack->end; \
- _elt->ack = _elt->end == _ack ? _ack : 0; \
- _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \
- _elt->group = _group; \
- } \
-}
-#else
-#define tcp_scoreboard_trace_add(_tc, _ack)
-#endif
-
-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);
-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);
-void scoreboard_clear (sack_scoreboard_t * sb);
-void scoreboard_init (sack_scoreboard_t * sb);
-u8 *format_tcp_scoreboard (u8 * s, va_list * args);
-
-typedef enum _tcp_cc_algorithm_type
-{
- TCP_CC_NEWRENO,
- TCP_CC_CUBIC,
-} tcp_cc_algorithm_type_e;
-
-typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
-
-typedef enum _tcp_cc_ack_t
-{
- TCP_CC_ACK,
- TCP_CC_DUPACK,
- TCP_CC_PARTIALACK
-} tcp_cc_ack_t;
-
-typedef struct _tcp_connection
-{
- CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
- transport_connection_t connection; /**< Common transport data. First! */
-
- u8 state; /**< TCP state as per tcp_state_t */
- u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
- u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
-
- /* TODO RFC4898 */
-
- /** Send sequence variables RFC793 */
- u32 snd_una; /**< oldest unacknowledged sequence number */
- u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
- u32 snd_wnd; /**< send window */
- u32 snd_wl1; /**< seq number used for last snd.wnd update */
- u32 snd_wl2; /**< ack number used for last snd.wnd update */
- u32 snd_nxt; /**< next seq number to be sent */
- u16 snd_mss; /**< Effective send max seg (data) size */
-
- /** Receive sequence variables RFC793 */
- u32 rcv_nxt; /**< next sequence number expected */
- u32 rcv_wnd; /**< receive window we expect */
-
- u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
- u32 iss; /**< initial sent sequence */
- u32 irs; /**< initial remote sequence */
-
- /* Options */
- u8 snd_opts_len; /**< Tx options len */
- u8 rcv_wscale; /**< Window scale to advertise to peer */
- u8 snd_wscale; /**< Window scale to use when sending */
- u32 tsval_recent; /**< Last timestamp received */
- u32 tsval_recent_age; /**< When last updated tstamp_recent*/
- tcp_options_t snd_opts; /**< Tx options for connection */
- tcp_options_t rcv_opts; /**< Rx options for connection */
-
- sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
- sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
-
- u16 rcv_dupacks; /**< Number of DUPACKs received */
- u8 pending_dupacks; /**< Number of DUPACKs to be sent */
-
- /* Congestion control */
- u32 cwnd; /**< Congestion window */
- u32 cwnd_acc_bytes; /**< Bytes accumulated for cwnd increment */
- u32 ssthresh; /**< Slow-start threshold */
- u32 prev_ssthresh; /**< ssthresh before congestion */
- u32 prev_cwnd; /**< ssthresh before congestion */
- u32 bytes_acked; /**< Bytes acknowledged by current segment */
- u32 burst_acked; /**< Bytes acknowledged in current burst */
- u32 snd_rxt_bytes; /**< Retransmitted bytes */
- u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
- u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
- u32 snd_congestion; /**< snd_una_max when congestion is detected */
- tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
- u8 cc_data[TCP_CC_DATA_SZ]; /**< Congestion control algo private data */
-
- /* RTT and RTO */
- u32 rto; /**< Retransmission timeout */
- u32 rto_boff; /**< Index for RTO backoff */
- u32 srtt; /**< Smoothed RTT */
- u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
- u32 rtt_seq; /**< Sequence number for tracked ACK */
- f64 rtt_ts; /**< Timestamp for tracked ACK */
- f64 mrtt_us; /**< High precision mrtt from tracked acks */
-
- u16 mss; /**< Our max seg size that includes options */
- u32 limited_transmit; /**< snd_nxt when limited transmit starts */
- u32 last_fib_check; /**< Last time we checked fib route for peer */
- u32 sw_if_index; /**< Interface for the connection */
- u32 tx_fifo_size; /**< Tx fifo size. Used to constrain cwnd */
-} tcp_connection_t;
-
-struct _tcp_cc_algorithm
-{
- void (*rcv_ack) (tcp_connection_t * tc);
- void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack);
- void (*congestion) (tcp_connection_t * tc);
- void (*recovered) (tcp_connection_t * tc);
- void (*init) (tcp_connection_t * tc);
-};
-
-#define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
-#define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
-#define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
-#define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
-#define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
-#define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
-#define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
-#define tcp_fastrecovery_sent_1_smss(tc) ((tc)->flags & TCP_CONN_FR_1_SMSS)
-#define tcp_fastrecovery_1_smss_on(tc) ((tc)->flags |= TCP_CONN_FR_1_SMSS)
-#define tcp_fastrecovery_1_smss_off(tc) ((tc)->flags &= ~TCP_CONN_FR_1_SMSS)
-#define tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST)
-#define tcp_fastrecovery_first_on(tc) ((tc)->flags |= TCP_CONN_FRXT_FIRST)
-#define tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST)
-
-#define tcp_in_cong_recovery(tc) ((tc)->flags & \
- (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
-
-always_inline void
-tcp_cong_recovery_off (tcp_connection_t * tc)
-{
- tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
- tcp_fastrecovery_1_smss_off (tc);
- tcp_fastrecovery_first_off (tc);
-}
-
typedef enum _tcp_error
{
#define tcp_error(n,s) TCP_ERROR_##n,
u8 next, error;
} tcp_lookup_dispatch_t;
+#define foreach_tcp_wrk_stat \
+ _(timer_expirations, u64, "timer expirations") \
+ _(rxt_segs, u64, "segments retransmitted") \
+ _(tr_events, u32, "timer retransmit events") \
+ _(to_closewait, u32, "timeout close-wait") \
+ _(to_closewait2, u32, "timeout close-wait w/data") \
+ _(to_finwait1, u32, "timeout fin-wait-1") \
+ _(to_finwait2, u32, "timeout fin-wait-2") \
+ _(to_lastack, u32, "timeout last-ack") \
+ _(to_closing, u32, "timeout closing") \
+ _(tr_abort, u32, "timer retransmit abort") \
+ _(rst_unread, u32, "reset on close due to unread data") \
+ _(no_buffer, u32, "out of buffers") \
+
+typedef struct tcp_wrk_stats_
+{
+#define _(name, type, str) type name;
+ foreach_tcp_wrk_stat
+#undef _
+} tcp_wrk_stats_t;
+
+typedef struct tcp_free_req_
+{
+ clib_time_type_t free_time;
+ u32 connection_index;
+} tcp_cleanup_req_t;
+
typedef struct tcp_worker_ctx_
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
- u32 time_now; /**< worker time */
- tw_timer_wheel_16t_2w_512sl_t timer_wheel; /**< worker timer wheel */
- u32 *tx_buffers; /**< tx buffer free list */
- vlib_frame_t *tx_frames[2]; /**< tx frames for tcp 4/6
- output nodes */
- vlib_frame_t *ip_lookup_tx_frames[2]; /**< tx frames for ip 4/6
- lookup nodes */
- u32 *pending_fast_rxt; /**< vector of connections
- needing fast rxt */
- u32 *ongoing_fast_rxt; /**< vector of connections
- now doing fast rxt */
- u32 *postponed_fast_rxt; /**< vector of connections
- that will do fast rxt */
+
+ /** worker's pool of connections */
+ tcp_connection_t *connections;
+
+ /** vector of pending ack dequeues */
u32 *pending_deq_acked;
- u32 *pending_acks;
- vlib_main_t *vm; /**< pointer to vm */
- CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
- u8 cached_opts[40]; /**< cached 'on the wire'
- options for bursts */
+ /** vector of pending disconnect notifications */
+ u32 *pending_disconnects;
-} tcp_worker_ctx_t;
+ /** vector of pending reset notifications */
+ u32 *pending_resets;
-typedef struct _tcp_main
-{
- /* Per-worker thread tcp connection pools */
- tcp_connection_t **connections;
+ /** convenience pointer to this thread's vlib main */
+ vlib_main_t *vm;
- /* Pool of listeners. */
- tcp_connection_t *listener_pool;
+ /** Time used for high precision (us) measurements in seconds */
+ f64 time_us;
- /** Dispatch table by state and flags */
- tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
+ /** Time measured in @ref TCP_TSTAMP_TICK used for time stamps */
+ u32 time_tstamp;
- u8 log2_tstamp_clocks_per_tick;
- f64 tstamp_ticks_per_clock;
+ /* Max timers to be handled per dispatch loop */
+ u32 max_timers_per_loop;
- /** per-worker context */
- tcp_worker_ctx_t *wrk_ctx;
+ /* Fifo of pending timer expirations */
+ u32 *pending_timers;
- /* Pool of half-open connections on which we've sent a SYN */
- tcp_connection_t *half_open_connections;
- clib_spinlock_t half_open_lock;
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
- /* Congestion control algorithms registered */
- tcp_cc_algorithm_t *cc_algos;
+ /** cached 'on the wire' options for bursts */
+ u8 cached_opts[40];
- /** vlib buffer size */
- u32 bytes_per_buffer;
+ /** tx buffer free list */
+ u32 *tx_buffers;
- /*
- * Configuration
- */
+ /* fifo of pending free requests */
+ tcp_cleanup_req_t *pending_cleanups;
- /* Flag that indicates if stack is on or off */
- u8 is_enabled;
+ /** Session layer edge indices to tcp output */
+ u32 tco_next_node[2];
+
+ /** worker timer wheel */
+ tcp_timer_wheel_t timer_wheel;
- /** Max rx fifo size for a session. It is used in to compute the
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
+
+ tcp_wrk_stats_t stats;
+} tcp_worker_ctx_t;
+
+#define tcp_worker_stats_inc(_wrk,_stat,_val) \
+ _wrk->stats._stat += _val
+
+typedef struct tcp_iss_seed_
+{
+ u64 first;
+ u64 second;
+} tcp_iss_seed_t;
+
+typedef struct tcp_configuration_
+{
+ /** Max rx fifo size for a session (in bytes). It is used in to compute the
* rfc 7323 window scaling factor */
u32 max_rx_fifo;
- /** Number of preallocated connections */
- u32 preallocated_connections;
- u32 preallocated_half_open_connections;
+ /** Min rx fifo for a session (in bytes) */
+ u32 min_rx_fifo;
- /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
- ip4_address_t *ip4_src_addresses;
- u32 last_v4_address_rotor;
- u32 last_v6_address_rotor;
- ip6_address_t *ip6_src_addresses;
+ /** Default MTU to be used when establishing connections */
+ u16 default_mtu;
+
+ /** Initial CWND multiplier, which multiplies MSS to determine initial CWND.
+ * Set 0 to determine the initial CWND by another way */
+ u16 initial_cwnd_multiplier;
/** Enable tx pacing for new connections */
- u8 tx_pacing;
+ u8 enable_tx_pacing;
- u8 punt_unknown4;
- u8 punt_unknown6;
+ /** Allow use of TSO whenever available */
+ u8 allow_tso;
- /** fault-injection */
- f64 buffer_fail_fraction;
+ /** Set if csum offloading is enabled */
+ u8 csum_offload;
- u8 cc_algo;
-} tcp_main_t;
+ /** Default congestion control algorithm type */
+ tcp_cc_algorithm_type_e cc_algo;
-extern tcp_main_t tcp_main;
-extern vlib_node_registration_t tcp4_input_node;
-extern vlib_node_registration_t tcp6_input_node;
-extern vlib_node_registration_t tcp4_output_node;
-extern vlib_node_registration_t tcp6_output_node;
+ /** Min rwnd, as number of snd_mss segments, for update ack to be sent after
+ * a zero rwnd advertisement */
+ u32 rwnd_min_update_ack;
-always_inline tcp_main_t *
-vnet_get_tcp_main ()
-{
- return &tcp_main;
-}
+ /** Timer ticks to wait for close from app */
+ u32 closewait_time;
-always_inline tcp_worker_ctx_t *
-tcp_get_worker (u32 thread_index)
-{
- return &tcp_main.wrk_ctx[thread_index];
-}
+ /** Timer ticks to wait in time-wait. Also known as 2MSL */
+ u32 timewait_time;
-always_inline tcp_header_t *
-tcp_buffer_hdr (vlib_buffer_t * b)
-{
- ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
- return (tcp_header_t *) (b->data + b->current_data
- + vnet_buffer (b)->tcp.hdr_offset);
-}
+ /** Timer ticks to wait in fin-wait1 to send fin and rcv fin-ack */
+ u32 finwait1_time;
-#if (VLIB_BUFFER_TRACE_TRAJECTORY)
-#define tcp_trajectory_add_start(b, start) \
-{ \
- (*vlib_buffer_trace_trajectory_cb) (b, start); \
-}
-#else
-#define tcp_trajectory_add_start(b, start)
-#endif
+ /** Timer ticks to wait in last ack for ack */
+ u32 lastack_time;
-clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
+ /** Timer ticks to wait in fin-wait2 for fin */
+ u32 finwait2_time;
-void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
+ /** Timer ticks to wait in closing for fin ack */
+ u32 closing_time;
-always_inline tcp_connection_t *
-tcp_connection_get (u32 conn_index, u32 thread_index)
-{
- if (PREDICT_FALSE
- (pool_is_free_index (tcp_main.connections[thread_index], conn_index)))
- return 0;
- return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
-}
+ /** Time to wait (sec) before cleaning up the connection */
+ f32 cleanup_time;
-always_inline tcp_connection_t *
-tcp_connection_get_if_valid (u32 conn_index, u32 thread_index)
-{
- if (tcp_main.connections[thread_index] == 0)
- return 0;
- if (pool_is_free_index (tcp_main.connections[thread_index], conn_index))
- return 0;
- return pool_elt_at_index (tcp_main.connections[thread_index], conn_index);
-}
+ /** Number of preallocated connections */
+ u32 preallocated_connections;
-always_inline tcp_connection_t *
-tcp_get_connection_from_transport (transport_connection_t * tconn)
-{
- return (tcp_connection_t *) tconn;
-}
+ /** Number of preallocated half-open connections */
+ u32 preallocated_half_open_connections;
-void tcp_connection_close (tcp_connection_t * tc);
-void tcp_connection_cleanup (tcp_connection_t * tc);
-void tcp_connection_del (tcp_connection_t * tc);
-int tcp_half_open_connection_cleanup (tcp_connection_t * tc);
-tcp_connection_t *tcp_connection_new (u8 thread_index);
-void tcp_connection_reset (tcp_connection_t * tc);
-int tcp_configure_v4_source_address_range (vlib_main_t * vm,
- ip4_address_t * start,
- ip4_address_t * end, u32 table_id);
-int tcp_configure_v6_source_address_range (vlib_main_t * vm,
- ip6_address_t * start,
- ip6_address_t * end, u32 table_id);
-void tcp_api_reference (void);
-u8 *format_tcp_connection (u8 * s, va_list * args);
+ /** Maxium allowed GSO packet size */
+ u32 max_gso_size;
-always_inline tcp_connection_t *
-tcp_listener_get (u32 tli)
-{
- return pool_elt_at_index (tcp_main.listener_pool, tli);
-}
+ /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
+ ip4_address_t *ip4_src_addrs;
+ ip6_address_t *ip6_src_addrs;
-always_inline tcp_connection_t *
-tcp_half_open_connection_get (u32 conn_index)
-{
- tcp_connection_t *tc = 0;
- clib_spinlock_lock_if_init (&tcp_main.half_open_lock);
- if (!pool_is_free_index (tcp_main.half_open_connections, conn_index))
- tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index);
- clib_spinlock_unlock_if_init (&tcp_main.half_open_lock);
- return tc;
-}
+ /** Fault-injection. Debug only */
+ f64 buffer_fail_fraction;
+} tcp_configuration_t;
-void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b);
-void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b);
-void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b);
-void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
- u8 is_ip4);
-void tcp_send_reset (tcp_connection_t * tc);
-void tcp_send_syn (tcp_connection_t * tc);
-void tcp_send_synack (tcp_connection_t * tc);
-void tcp_send_fin (tcp_connection_t * tc);
-void tcp_init_mss (tcp_connection_t * tc);
-void tcp_update_burst_snd_vars (tcp_connection_t * tc);
-void tcp_update_rto (tcp_connection_t * tc);
-void tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4);
-void tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk);
-void tcp_program_fastretransmit (tcp_worker_ctx_t * wrk,
- tcp_connection_t * tc);
-void tcp_do_fastretransmits (tcp_worker_ctx_t * wrk);
-
-void tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
-void tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
-void tcp_send_acks (tcp_worker_ctx_t * wrk);
-
-always_inline u32
-tcp_end_seq (tcp_header_t * th, u32 len)
+typedef struct _tcp_main
{
- return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len;
-}
-
-/* Modulo arithmetic for TCP sequence numbers */
-#define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0)
-#define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0)
-#define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0)
-#define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0)
-#define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2))
+ /** per-worker context */
+ tcp_worker_ctx_t *wrk_ctx;
-/* Modulo arithmetic for timestamps */
-#define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
-#define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
+ /* Pool of listeners. */
+ tcp_connection_t *listener_pool;
-/**
- * Our estimate of the number of bytes that have left the network
- */
-always_inline u32
-tcp_bytes_out (const tcp_connection_t * tc)
-{
- if (tcp_opts_sack_permitted (&tc->rcv_opts))
- return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes;
- else
- return tc->rcv_dupacks * tc->snd_mss;
-}
+ /** vlib buffer size */
+ u32 bytes_per_buffer;
-/**
- * Our estimate of the number of bytes in flight (pipe size)
- */
-always_inline u32
-tcp_flight_size (const tcp_connection_t * tc)
-{
- int flight_size;
-
- flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc)
- + tc->snd_rxt_bytes;
-
- if (flight_size < 0)
- {
- if (0)
- clib_warning
- ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d",
- tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc),
- tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes,
- tc->rcv_opts.flags);
- return 0;
- }
-
- return flight_size;
-}
+ /** Session layer edge indices to ip lookup (syns, rst) */
+ u32 ipl_next_node[2];
-/**
- * Initial cwnd as per RFC5681
- */
-always_inline u32
-tcp_initial_cwnd (const tcp_connection_t * tc)
-{
- if (tc->snd_mss > 2190)
- return 2 * tc->snd_mss;
- else if (tc->snd_mss > 1095)
- return 3 * tc->snd_mss;
- else
- return 4 * tc->snd_mss;
-}
+ /** Dispatch table by state and flags */
+ tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
-/*
- * Accumulate acked bytes for cwnd increase
- *
- * Once threshold bytes are accumulated, snd_mss bytes are added
- * to the cwnd.
- */
-always_inline void
-tcp_cwnd_accumulate (tcp_connection_t * tc, u32 thresh, u32 bytes)
-{
- tc->cwnd_acc_bytes += bytes;
- if (tc->cwnd_acc_bytes >= thresh)
- {
- u32 inc = tc->cwnd_acc_bytes / thresh;
- tc->cwnd_acc_bytes -= inc * thresh;
- tc->cwnd += inc * tc->snd_mss;
- tc->cwnd = clib_min (tc->cwnd, tc->tx_fifo_size);
- }
-}
+ clib_spinlock_t half_open_lock;
-always_inline u32
-tcp_loss_wnd (const tcp_connection_t * tc)
-{
- return tc->snd_mss;
-}
+ /** Pool of half-open connections on which we've sent a SYN */
+ tcp_connection_t *half_open_connections;
-always_inline u32
-tcp_available_snd_wnd (const tcp_connection_t * tc)
-{
- return clib_min (tc->cwnd, tc->snd_wnd);
-}
+ /** Seed used to generate random iss */
+ tcp_iss_seed_t iss_seed;
-always_inline u32
-tcp_available_output_snd_space (const tcp_connection_t * tc)
-{
- u32 available_wnd = tcp_available_snd_wnd (tc);
- int flight_size = (int) (tc->snd_nxt - tc->snd_una);
+ /** Congestion control algorithms registered */
+ tcp_cc_algorithm_t *cc_algos;
- if (available_wnd <= flight_size)
- return 0;
+ /** Hash table of cc algorithms by name */
+ uword *cc_algo_by_name;
- return available_wnd - flight_size;
-}
+ /** Last cc algo registered */
+ tcp_cc_algorithm_type_e cc_last_type;
-/**
- * Estimate of how many bytes we can still push into the network
- */
-always_inline u32
-tcp_available_cc_snd_space (const tcp_connection_t * tc)
-{
- u32 available_wnd = tcp_available_snd_wnd (tc);
- u32 flight_size = tcp_flight_size (tc);
+ /** Flag that indicates if stack is on or off */
+ u8 is_enabled;
- if (available_wnd <= flight_size)
- return 0;
+ /** Flag that indicates if v4 punting is enabled */
+ u8 punt_unknown4;
- return available_wnd - flight_size;
-}
+ /** Flag that indicates if v6 punting is enabled */
+ u8 punt_unknown6;
-always_inline u8
-tcp_is_lost_fin (tcp_connection_t * tc)
-{
- if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1)
- return 1;
- return 0;
-}
+ /** Rotor for v4 source addresses */
+ u32 last_v4_addr_rotor;
-u32 tcp_snd_space (tcp_connection_t * tc);
-int tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk,
- tcp_connection_t * tc);
-int tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk,
- tcp_connection_t * tc, u32 burst_size);
-int tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size);
-int tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
- u32 burst_size);
-void tcp_cc_init_congestion (tcp_connection_t * tc);
-void tcp_cc_fastrecovery_exit (tcp_connection_t * tc);
+ /** Rotor for v6 source addresses */
+ u32 last_v6_addr_rotor;
-fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
+ /** Protocol configuration */
+ tcp_configuration_t cfg;
+} tcp_main_t;
-/* Made public for unit testing only */
-void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
-u32 tcp_sack_list_bytes (tcp_connection_t * tc);
+extern tcp_main_t tcp_main;
+extern vlib_node_registration_t tcp4_input_node;
+extern vlib_node_registration_t tcp6_input_node;
+extern vlib_node_registration_t tcp4_output_node;
+extern vlib_node_registration_t tcp6_output_node;
+extern vlib_node_registration_t tcp4_established_node;
+extern vlib_node_registration_t tcp6_established_node;
+extern vlib_node_registration_t tcp4_syn_sent_node;
+extern vlib_node_registration_t tcp6_syn_sent_node;
+extern vlib_node_registration_t tcp4_rcv_process_node;
+extern vlib_node_registration_t tcp6_rcv_process_node;
+extern vlib_node_registration_t tcp4_listen_node;
+extern vlib_node_registration_t tcp6_listen_node;
+
+#define tcp_cfg tcp_main.cfg
+#define tcp_node_index(node_id, is_ip4) \
+ ((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index)
-always_inline u32
-tcp_time_now (void)
+always_inline tcp_main_t *
+vnet_get_tcp_main ()
{
- return tcp_main.wrk_ctx[vlib_get_thread_index ()].time_now;
+ return &tcp_main;
}
-always_inline u32
-tcp_time_now_w_thread (u32 thread_index)
+always_inline tcp_worker_ctx_t *
+tcp_get_worker (u32 thread_index)
{
- return tcp_main.wrk_ctx[thread_index].time_now;
+ ASSERT (thread_index < vec_len (tcp_main.wrk_ctx));
+ return &tcp_main.wrk_ctx[thread_index];
}
-always_inline f64
-tcp_time_now_us (u32 thread_index)
-{
- return transport_time_now (thread_index);
-}
+tcp_connection_t *tcp_connection_alloc (u8 thread_index);
+tcp_connection_t *tcp_connection_alloc_w_base (u8 thread_index,
+ tcp_connection_t * base);
+void tcp_connection_free (tcp_connection_t * tc);
+void tcp_connection_close (tcp_connection_t * tc);
+void tcp_connection_cleanup (tcp_connection_t * tc);
+void tcp_connection_del (tcp_connection_t * tc);
+int tcp_half_open_connection_cleanup (tcp_connection_t * tc);
-always_inline u32
-tcp_set_time_now (tcp_worker_ctx_t * wrk)
-{
- wrk->time_now = clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
- return wrk->time_now;
-}
+void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
+ u32 thread_index, u8 is_ip4);
+void tcp_send_reset (tcp_connection_t * tc);
+void tcp_send_syn (tcp_connection_t * tc);
+void tcp_send_synack (tcp_connection_t * tc);
+void tcp_send_fin (tcp_connection_t * tc);
+void tcp_send_ack (tcp_connection_t * tc);
+void tcp_send_window_update_ack (tcp_connection_t * tc);
-u32 tcp_push_header (tcp_connection_t * tconn, vlib_buffer_t * b);
+void tcp_program_ack (tcp_connection_t * tc);
+void tcp_program_dupack (tcp_connection_t * tc);
+void tcp_program_retransmit (tcp_connection_t * tc);
+
+void tcp_update_burst_snd_vars (tcp_connection_t * tc);
+u32 tcp_snd_space (tcp_connection_t * tc);
+int tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc);
+void tcp_reschedule (tcp_connection_t * tc);
+fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
+u32 tcp_session_push_header (transport_connection_t * tconn,
+ vlib_buffer_t * b);
+int tcp_session_custom_tx (void *conn, transport_send_params_t * sp);
void tcp_connection_timers_init (tcp_connection_t * tc);
void tcp_connection_timers_reset (tcp_connection_t * tc);
void tcp_connection_tx_pacer_update (tcp_connection_t * tc);
void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
u32 start_bucket);
+void tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
+void tcp_check_gso (tcp_connection_t *tc);
-always_inline void
-tcp_cc_rcv_ack (tcp_connection_t * tc)
-{
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
-}
-
-always_inline void
-tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
-{
- ASSERT (tc->c_thread_index == vlib_get_thread_index ());
- ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID);
- tc->timers[timer_id] =
- tw_timer_start_16t_2w_512sl (&tcp_main.
- wrk_ctx[tc->c_thread_index].timer_wheel,
- tc->c_c_index, timer_id, interval);
-}
-
-always_inline void
-tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
-{
- ASSERT (tc->c_thread_index == vlib_get_thread_index ());
- if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
- return;
-
- tw_timer_stop_16t_2w_512sl (&tcp_main.
- wrk_ctx[tc->c_thread_index].timer_wheel,
- tc->timers[timer_id]);
- tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
-}
-
-always_inline void
-tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
-{
- ASSERT (tc->c_thread_index == vlib_get_thread_index ());
- if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
- tw_timer_update_16t_2w_512sl (&tcp_main.
- wrk_ctx[tc->c_thread_index].timer_wheel,
- tc->timers[timer_id], interval);
- else
- tc->timers[timer_id] =
- tw_timer_start_16t_2w_512sl (&tcp_main.
- wrk_ctx[tc->c_thread_index].timer_wheel,
- tc->c_c_index, timer_id, interval);
-}
-
-always_inline void
-tcp_retransmit_timer_set (tcp_connection_t * tc)
-{
- ASSERT (tc->snd_una != tc->snd_una_max);
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
- clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
-}
-
-always_inline void
-tcp_retransmit_timer_reset (tcp_connection_t * tc)
-{
- tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
-}
-
-always_inline void
-tcp_retransmit_timer_force_update (tcp_connection_t * tc)
-{
- tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
- clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
-}
-
-always_inline void
-tcp_persist_timer_set (tcp_connection_t * tc)
-{
- /* Reuse RTO. It's backed off in handler */
- tcp_timer_set (tc, TCP_TIMER_PERSIST,
- clib_max (tc->rto * TCP_TO_TIMER_TICK,
- TCP_TIMER_PERSIST_MIN));
-}
-
-always_inline void
-tcp_persist_timer_update (tcp_connection_t * tc)
-{
- tcp_timer_update (tc, TCP_TIMER_PERSIST,
- clib_max (tc->rto * TCP_TO_TIMER_TICK,
- TCP_TIMER_PERSIST_MIN));
-}
-
-always_inline void
-tcp_persist_timer_reset (tcp_connection_t * tc)
-{
- tcp_timer_reset (tc, TCP_TIMER_PERSIST);
-}
+void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
+int tcp_configure_v4_source_address_range (vlib_main_t * vm,
+ ip4_address_t * start,
+ ip4_address_t * end, u32 table_id);
+int tcp_configure_v6_source_address_range (vlib_main_t * vm,
+ ip6_address_t * start,
+ ip6_address_t * end, u32 table_id);
-always_inline void
-tcp_retransmit_timer_update (tcp_connection_t * tc)
-{
- if (tc->snd_una == tc->snd_una_max)
- {
- tcp_retransmit_timer_reset (tc);
- if (tc->snd_wnd < tc->snd_mss)
- tcp_persist_timer_update (tc);
- }
- else
- tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
- clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
-}
+clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
-always_inline u8
-tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
-{
- return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
-}
+format_function_t format_tcp_state;
+format_function_t format_tcp_flags;
+format_function_t format_tcp_sacks;
+format_function_t format_tcp_rcv_sacks;
+format_function_t format_tcp_connection;
+format_function_t format_tcp_connection_id;
#define tcp_validate_txf_size(_tc, _a) \
ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
- || session_tx_fifo_max_dequeue (&_tc->connection) >= _a)
-
-void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
-u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose);
-
-void tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
- const tcp_cc_algorithm_t * vft);
-
-tcp_cc_algorithm_t *tcp_cc_algo_get (tcp_cc_algorithm_type_e type);
-
-static inline void *
-tcp_cc_data (tcp_connection_t * tc)
-{
- return (void *) tc->cc_data;
-}
-
-void newreno_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type);
-
-/**
- * Push TCP header to buffer
- *
- * @param vm - vlib_main
- * @param b - buffer to write the header to
- * @param sp_net - source port net order
- * @param dp_net - destination port net order
- * @param seq - sequence number net order
- * @param ack - ack number net order
- * @param tcp_hdr_opts_len - header and options length in bytes
- * @param flags - header flags
- * @param wnd - window size
- *
- * @return - pointer to start of TCP header
- */
-always_inline void *
-vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq,
- u32 ack, u8 tcp_hdr_opts_len, u8 flags,
- u16 wnd)
-{
- tcp_header_t *th;
-
- th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len);
-
- th->src_port = sp;
- th->dst_port = dp;
- th->seq_number = seq;
- th->ack_number = ack;
- th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4;
- th->flags = flags;
- th->window = wnd;
- th->checksum = 0;
- th->urgent_pointer = 0;
- return th;
-}
-
-/**
- * Push TCP header to buffer
- *
- * @param b - buffer to write the header to
- * @param sp_net - source port net order
- * @param dp_net - destination port net order
- * @param seq - sequence number host order
- * @param ack - ack number host order
- * @param tcp_hdr_opts_len - header and options length in bytes
- * @param flags - header flags
- * @param wnd - window size
- *
- * @return - pointer to start of TCP header
- */
-always_inline void *
-vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq,
- u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd)
-{
- return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net,
- clib_host_to_net_u32 (seq),
- clib_host_to_net_u32 (ack),
- tcp_hdr_opts_len, flags,
- clib_host_to_net_u16 (wnd));
-}
+ || transport_max_tx_dequeue (&_tc->connection) >= _a)
#endif /* _vnet_tcp_h_ */
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