#include <vnet/tcp/tcp_timer.h>
#include <vnet/session/transport.h>
#include <vnet/session/session.h>
+#include <vnet/tcp/tcp_debug.h>
-#define TCP_TICK 10e-3 /**< TCP tick period (s) */
-#define THZ 1/TCP_TICK /**< TCP tick frequency */
+#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_DUPACK_THRESHOLD 3
-#define TCP_DEFAULT_RX_FIFO_SIZE 64 << 10
+#define TCP_DUPACK_THRESHOLD 3
+#define TCP_MAX_RX_FIFO_SIZE 4 << 20
+#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 \
} tcp_state_t;
format_function_t format_tcp_state;
+format_function_t format_tcp_flags;
+format_function_t format_tcp_sacks;
/** TCP timers */
#define foreach_tcp_timer \
_(DELACK, "DELAYED ACK") \
_(PERSIST, "PERSIST") \
_(KEEP, "KEEP") \
- _(2MSL, "2MSL") \
- _(RETRANSMIT_SYN, "RETRANSMIT_SYN") \
+ _(WAITCLOSE, "WAIT CLOSE") \
+ _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
_(ESTABLISH, "ESTABLISH")
typedef enum _tcp_timers
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)
#define TCP_DELACK_TIME 1 /* 0.1s */
#define TCP_ESTABLISH_TIME 750 /* 75s */
#define TCP_2MSL_TIME 300 /* 30s */
+#define TCP_CLOSEWAIT_TIME 20 /* 0.1s */
+#define TCP_CLEANUP_TIME 5 /* 0.5s 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 */
-void tcp_update_time (f64 now, u32 thread_index);
-
/** TCP connection flags */
#define foreach_tcp_connection_flag \
- _(DELACK, "Delay ACK") \
_(SNDACK, "Send ACK") \
- _(BURSTACK, "Burst ACK set") \
+ _(FINSNT, "FIN sent") \
_(SENT_RCV_WND0, "Sent 0 receive window") \
_(RECOVERY, "Recovery on") \
- _(FAST_RECOVERY, "Fast Recovery on")
+ _(FAST_RECOVERY, "Fast Recovery on") \
+ _(FR_1_SMSS, "Sent 1 SMSS")
typedef enum _tcp_connection_flag_bits
{
#undef _
};
-#define TCP_MAX_SACK_BLOCKS 5 /**< Max number of SACK blocks stored */
+#define TCP_MAX_SACK_BLOCKS 15 /**< Max number of SACK blocks stored */
#define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
typedef struct _sack_scoreboard_hole
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 to first entry */
+ 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 */
} sack_scoreboard_t;
typedef enum _tcp_cc_algorithm_type
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 irs; /**< initial remote sequence */
/* Options */
- tcp_options_t opt; /**< TCP connection options parsed */
+ tcp_options_t rcv_opts; /**< Rx options for connection */
+ tcp_options_t snd_opts; /**< Tx options for connection */
+ 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 */
sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
- u8 rcv_dupacks; /**< Number of DUPACKs received */
+ u16 rcv_dupacks; /**< Number of DUPACKs received */
u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */
/* Congestion control */
u32 cwnd; /**< Congestion window */
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 rtx_bytes; /**< Retransmitted bytes */
- u32 tsecr_last_ack; /**< Timestamp echoed to us in last health ACK */
+ 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 */
/* RTT and RTO */
u32 rtt_ts; /**< Timestamp for tracked ACK */
u32 rtt_seq; /**< Sequence number for tracked ACK */
- u16 snd_mss; /**< Send MSS */
+ 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 */
} tcp_connection_t;
struct _tcp_cc_algorithm
#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_FAST_RECOVERY | TCP_CONN_RECOVERY))
-#define tcp_recovery_off(tc) ((tc)->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_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_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);
+}
typedef enum
{
/* Per worker-thread timer wheel for connections timers */
tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
- /* Convenience per worker-thread vector of connections to DELACK */
- u32 **delack_connections;
+// /* Convenience per worker-thread vector of connections to DELACK */
+// u32 **delack_connections;
/* Pool of half-open connections on which we've sent a SYN */
tcp_connection_t *half_open_connections;
/* Congestion control algorithms registered */
tcp_cc_algorithm_t *cc_algos;
+ /* Flag that indicates if stack is on or off */
+ u8 is_enabled;
+
+ /** Number of preallocated connections */
+ u32 preallocated_connections;
+ u32 preallocated_half_open_connections;
+
+ /** 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;
+
/* convenience */
vlib_main_t *vlib_main;
vnet_main_t *vnet_main;
return &tcp_main;
}
+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);
+}
+
+clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
+
always_inline tcp_connection_t *
tcp_connection_get (u32 conn_index, u32 thread_index)
{
+ 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);
}
void tcp_connection_close (tcp_connection_t * tc);
void tcp_connection_cleanup (tcp_connection_t * tc);
void tcp_connection_del (tcp_connection_t * tc);
+void tcp_connection_reset (tcp_connection_t * tc);
+
+u8 *format_tcp_connection_id (u8 * s, va_list * args);
+u8 *format_tcp_connection (u8 * s, va_list * args);
+u8 *format_tcp_scoreboard (u8 * s, va_list * args);
always_inline tcp_connection_t *
tcp_listener_get (u32 tli)
}
void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b);
-void tcp_make_finack (tcp_connection_t * tc, 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 (vlib_buffer_t * pkt, u8 is_ip4);
void tcp_send_syn (tcp_connection_t * tc);
void tcp_send_fin (tcp_connection_t * tc);
-void tcp_set_snd_mss (tcp_connection_t * tc);
+void tcp_init_mss (tcp_connection_t * tc);
+void tcp_update_snd_mss (tcp_connection_t * tc);
+void tcp_update_rto (tcp_connection_t * tc);
always_inline u32
tcp_end_seq (tcp_header_t * th, u32 len)
#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))
/* Modulo arithmetic for timestamps */
#define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0)
#define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0)
+/**
+ * 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;
+}
+
+/**
+ * Our estimate of the number of bytes in flight (pipe size)
+ */
always_inline u32
tcp_flight_size (const tcp_connection_t * tc)
{
- return tc->snd_una_max - tc->snd_una - tc->sack_sb.sacked_bytes
- + tc->rtx_bytes;
+ 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;
}
/**
return available_wnd - flight_size;
}
-void tcp_retransmit_first_unacked (tcp_connection_t * tc);
+i32 tcp_rcv_wnd_available (tcp_connection_t * tc);
+u32 tcp_snd_space (tcp_connection_t * tc);
+void tcp_update_rcv_wnd (tcp_connection_t * tc);
+void tcp_retransmit_first_unacked (tcp_connection_t * tc);
+void tcp_fast_retransmit_no_sack (tcp_connection_t * tc);
+void tcp_fast_retransmit_sack (tcp_connection_t * tc);
void tcp_fast_retransmit (tcp_connection_t * tc);
+void tcp_cc_init_congestion (tcp_connection_t * tc);
+int tcp_cc_recover (tcp_connection_t * tc);
+void tcp_cc_fastrecovery_exit (tcp_connection_t * tc);
+
+fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
+
+/* Made public for unit testing only */
+void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end);
always_inline u32
tcp_time_now (void)
return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock;
}
+always_inline void
+tcp_update_time (f64 now, u32 thread_index)
+{
+ tw_timer_expire_timers_16t_2w_512sl (&tcp_main.timer_wheels[thread_index],
+ now);
+}
+
u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
u32
tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
- u32 max_bytes);
+ u32 offset, u32 max_bytes);
void tcp_connection_timers_init (tcp_connection_t * tc);
void tcp_connection_timers_reset (tcp_connection_t * tc);
-
void tcp_connection_init_vars (tcp_connection_t * tc);
always_inline void
always_inline void
tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
{
+ ASSERT (tc->c_thread_index == vlib_get_thread_index ());
tc->timers[timer_id]
= tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
tc->c_c_index, timer_id, interval);
}
-always_inline void
-tcp_retransmit_timer_set (tcp_main_t * tm, tcp_connection_t * tc)
-{
- /* XXX Switch to faster TW */
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
- clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
-}
-
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;
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_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index],
tc->timers[timer_id]);
tc->c_c_index, timer_id, interval);
}
+/* XXX Switch retransmit to faster TW */
+always_inline void
+tcp_retransmit_timer_set (tcp_connection_t * tc)
+{
+ 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);
+}
+
+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_set (tc);
+ }
+ else
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
+ clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+}
+
always_inline u8
tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
{
return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
}
+#define tcp_validate_txf_size(_tc, _a) \
+ ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
+ || stream_session_tx_fifo_max_dequeue (&_tc->connection) >= _a)
+
void
scoreboard_remove_hole (sack_scoreboard_t * sb,
sack_scoreboard_hole_t * hole);
+void scoreboard_update_lost (tcp_connection_t * tc, sack_scoreboard_t * sb);
+sack_scoreboard_hole_t *scoreboard_insert_hole (sack_scoreboard_t * sb,
+ u32 prev_index, u32 start,
+ u32 end);
+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);
+void scoreboard_init_high_rxt (sack_scoreboard_t * sb);
+
+always_inline sack_scoreboard_hole_t *
+scoreboard_get_hole (sack_scoreboard_t * sb, u32 index)
+{
+ if (index != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, index);
+ return 0;
+}
always_inline sack_scoreboard_hole_t *
scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
return 0;
}
+always_inline sack_scoreboard_hole_t *
+scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, hole->prev);
+ return 0;
+}
+
always_inline sack_scoreboard_hole_t *
scoreboard_first_hole (sack_scoreboard_t * sb)
{
return 0;
}
+always_inline sack_scoreboard_hole_t *
+scoreboard_last_hole (sack_scoreboard_t * sb)
+{
+ if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, sb->tail);
+ return 0;
+}
+
always_inline void
scoreboard_clear (sack_scoreboard_t * sb)
{
- sack_scoreboard_hole_t *hole = scoreboard_first_hole (sb);
+ sack_scoreboard_hole_t *hole;
while ((hole = scoreboard_first_hole (sb)))
{
scoreboard_remove_hole (sb, hole);
}
+ ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX);
+ sb->sacked_bytes = 0;
+ sb->last_sacked_bytes = 0;
+ sb->last_bytes_delivered = 0;
+ sb->snd_una_adv = 0;
+ sb->high_sacked = 0;
+ sb->high_rxt = 0;
+ sb->lost_bytes = 0;
+ sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
}
always_inline u32
return hole->end - hole->start;
}
+always_inline u32
+scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ return hole - sb->holes;
+}
+
+always_inline void
+scoreboard_init (sack_scoreboard_t * sb)
+{
+ sb->head = TCP_INVALID_SACK_HOLE_INDEX;
+ sb->tail = TCP_INVALID_SACK_HOLE_INDEX;
+ sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
+}
+
+void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack);
+
always_inline void
tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
const tcp_cc_algorithm_t * vft)
/**
* 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
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