data = (const u8 *) (th + 1);
/* Zero out all flags but those set in SYN */
- to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE);
+ to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE
+ | TCP_OPTS_FLAG_SACK);
for (; opts_len > 0; opts_len -= opt_len, data += opt_len)
{
{
ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval));
tc->tsval_recent = tc->rcv_opts.tsval;
- tc->tsval_recent_age = tcp_time_now ();
+ tc->tsval_recent_age = tcp_time_now_w_thread (tc->c_thread_index);
}
}
* @return 0 if segments passes validation.
*/
static int
-tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0,
- vlib_buffer_t * b0, tcp_header_t * th0,
- u32 * next0, u32 * error0)
+tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
+ vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0)
{
/* We could get a burst of RSTs interleaved with acks */
if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
{
tcp_send_reset (tc0);
*error0 = TCP_ERROR_CONNECTION_CLOSED;
- goto drop;
+ goto error;
}
if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0)))
{
*error0 = TCP_ERROR_SEGMENT_INVALID;
- goto drop;
+ goto error;
}
if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts)))
{
clib_warning ("options parse error");
*error0 = TCP_ERROR_OPTIONS;
- goto drop;
+ goto error;
}
if (PREDICT_FALSE (tcp_segment_check_paws (tc0)))
/* If it just so happens that a segment updates tsval_recent for a
* segment over 24 days old, invalidate tsval_recent. */
if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE,
- tcp_time_now ()))
+ tcp_time_now_w_thread (tc0->c_thread_index)))
{
/* Age isn't reset until we get a valid tsval (bsd inspired) */
tc0->tsval_recent = 0;
/* Drop after ack if not rst */
if (!tcp_rst (th0))
{
- tcp_make_ack (tc0, b0);
+ tcp_program_ack (wrk, tc0);
TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
- goto error;
}
}
- goto drop;
+ goto error;
}
/* 1st: check sequence number */
/* If not RST, send dup ack */
if (!tcp_rst (th0))
{
- tcp_make_ack (tc0, b0);
+ tcp_program_dupack (wrk, tc0);
TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
- goto error;
}
- goto drop;
+ goto error;
}
}
{
tcp_connection_reset (tc0);
*error0 = TCP_ERROR_RST_RCVD;
- goto drop;
+ goto error;
}
/* 3rd: check security and precedence (skip) */
/* TODO implement RFC 5961 */
if (tc0->state == TCP_STATE_SYN_RCVD)
{
- tcp_make_synack (tc0, b0);
+ tcp_send_synack (tc0);
TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0);
}
else
{
- tcp_make_ack (tc0, b0);
+ tcp_program_ack (wrk, tc0);
TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0);
}
goto error;
vnet_buffer (b0)->tcp.seq_end);
return 0;
-drop:
- *next0 = tcp_next_drop (tc0->c_is_ip4);
- return -1;
error:
- *next0 = tcp_next_output (tc0->c_is_ip4);
return -1;
}
if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
{
- mrtt = tcp_time_now () - tc->rtt_ts;
+ tc->mrtt_us = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts;
+ mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1);
}
/* As per RFC7323 TSecr can be used for RTTM only if the segment advances
* snd_una, i.e., the left side of the send window:
* seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */
else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr)
{
- mrtt = tcp_time_now () - tc->rcv_opts.tsecr;
+ u32 now = tcp_time_now_w_thread (tc->c_thread_index);
+ mrtt = clib_max (now - tc->rcv_opts.tsecr, 1);
}
/* Ignore dubious measurements */
}
/**
- * Dequeue bytes that have been acked and while at it update RTT estimates.
+ * Dequeue bytes for connections that have received acks in last burst
*/
static void
-tcp_dequeue_acked (tcp_connection_t * tc, u32 ack)
+tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk)
{
- /* Dequeue the newly ACKed add SACKed bytes */
- stream_session_dequeue_drop (&tc->connection,
- tc->bytes_acked + tc->sack_sb.snd_una_adv);
+ u32 thread_index = wrk->vm->thread_index;
+ u32 *pending_deq_acked;
+ tcp_connection_t *tc;
+ int i;
- tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
+ if (!vec_len (wrk->pending_deq_acked))
+ return;
- /* Update rtt and rto */
- tcp_update_rtt (tc, ack);
+ pending_deq_acked = wrk->pending_deq_acked;
+ for (i = 0; i < vec_len (pending_deq_acked); i++)
+ {
+ tc = tcp_connection_get (pending_deq_acked[i], thread_index);
+ tc->flags &= ~TCP_CONN_DEQ_PENDING;
- /* If everything has been acked, stop retransmit timer
- * otherwise update. */
- tcp_retransmit_timer_update (tc);
+ /* Dequeue the newly ACKed bytes */
+ stream_session_dequeue_drop (&tc->connection, tc->burst_acked);
+ tc->burst_acked = 0;
+ tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
+
+ /* If everything has been acked, stop retransmit timer
+ * otherwise update. */
+ tcp_retransmit_timer_update (tc);
+ }
+ _vec_len (wrk->pending_deq_acked) = 0;
+}
+
+static void
+tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ if (!(tc->flags & TCP_CONN_DEQ_PENDING))
+ {
+ vec_add1 (wrk->pending_deq_acked, tc->c_c_index);
+ tc->flags |= TCP_CONN_DEQ_PENDING;
+ }
+ tc->burst_acked += tc->bytes_acked + tc->sack_sb.snd_una_adv;
}
/**
/* Poison the entry */
if (CLIB_DEBUG > 0)
- memset (hole, 0xfe, sizeof (*hole));
+ clib_memset (hole, 0xfe, sizeof (*hole));
pool_put (sb->holes, hole);
}
u32 hole_index;
pool_get (sb->holes, hole);
- memset (hole, 0, sizeof (*hole));
+ clib_memset (hole, 0, sizeof (*hole));
hole->start = start;
hole->end = end;
static void
scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb)
{
- sack_scoreboard_hole_t *hole, *prev;
+ sack_scoreboard_hole_t *left, *right;
u32 bytes = 0, blks = 0;
sb->lost_bytes = 0;
sb->sacked_bytes = 0;
- hole = scoreboard_last_hole (sb);
- if (!hole)
+ left = scoreboard_last_hole (sb);
+ if (!left)
return;
- if (seq_gt (sb->high_sacked, hole->end))
+ if (seq_gt (sb->high_sacked, left->end))
{
- bytes = sb->high_sacked - hole->end;
+ bytes = sb->high_sacked - left->end;
blks = 1;
}
- while ((prev = scoreboard_prev_hole (sb, hole))
- && (bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss
- && blks < TCP_DUPACK_THRESHOLD))
+ while ((right = left)
+ && bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss
+ && blks < TCP_DUPACK_THRESHOLD
+ /* left not updated if above conditions fail */
+ && (left = scoreboard_prev_hole (sb, right)))
{
- bytes += hole->start - prev->end;
+ bytes += right->start - left->end;
blks++;
- hole = prev;
}
- while (hole)
+ /* left is first lost */
+ if (left)
{
- sb->lost_bytes += scoreboard_hole_bytes (hole);
- hole->is_lost = 1;
- prev = hole;
- hole = scoreboard_prev_hole (sb, hole);
- if (hole)
- bytes += prev->start - hole->end;
+ do
+ {
+ sb->lost_bytes += scoreboard_hole_bytes (right);
+ left->is_lost = 1;
+ left = scoreboard_prev_hole (sb, right);
+ if (left)
+ bytes += right->start - left->end;
+ }
+ while ((right = left));
}
+
sb->sacked_bytes = bytes;
}
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)
+ u8 have_unsent, u8 * can_rescue, u8 * snd_limited)
{
sack_scoreboard_hole_t *hole = 0;
}
else
{
- /* Rule (2): output takes care of transmitting new data */
- if (!have_sent_1_smss)
+ /* Rule (2): available unsent data */
+ if (have_unsent)
{
- hole = 0;
sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
+ return 0;
}
/* Rule (3): if hole not lost */
else if (seq_lt (hole->start, sb->high_sacked))
{
- *snd_limited = 1;
+ *snd_limited = 0;
sb->cur_rxt_hole = scoreboard_hole_index (sb, hole);
}
/* Rule (4): if hole beyond high_sacked */
}
static void
-scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 seq)
+scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 snd_una)
{
sack_scoreboard_hole_t *hole;
hole = scoreboard_first_hole (sb);
if (hole)
{
- seq = seq_gt (seq, hole->start) ? seq : hole->start;
+ snd_una = seq_gt (snd_una, hole->start) ? snd_una : hole->start;
sb->cur_rxt_hole = sb->head;
}
- sb->high_rxt = seq;
+ sb->high_rxt = snd_una;
+ sb->rescue_rxt = snd_una - 1;
}
void
{
sack_scoreboard_hole_t *hole;
hole = scoreboard_first_hole (&tc->sack_sb);
- return (!hole || seq_geq (hole->start, tc->snd_una));
+ return (!hole || (seq_geq (hole->start, tc->snd_una)
+ && seq_lt (hole->end, tc->snd_una_max)));
}
void
}
}
+ if (pool_elts (sb->holes) == 1)
+ {
+ hole = scoreboard_first_hole (sb);
+ if (hole->start == ack + sb->snd_una_adv
+ && hole->end == tc->snd_una_max)
+ scoreboard_remove_hole (sb, hole);
+ }
+
scoreboard_update_bytes (tc, sb);
sb->last_sacked_bytes = sb->sacked_bytes
- (old_sacked_bytes - sb->last_bytes_delivered);
ASSERT (sb->last_sacked_bytes <= sb->sacked_bytes || tcp_in_recovery (tc));
- ASSERT (sb->sacked_bytes == 0
+ ASSERT (sb->sacked_bytes == 0 || tcp_in_recovery (tc)
|| sb->sacked_bytes < tc->snd_una_max - seq_max (tc->snd_una, ack));
ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_una_max
- - seq_max (tc->snd_una, ack));
+ - seq_max (tc->snd_una, ack) || tcp_in_recovery (tc));
ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc)
|| sb->holes[sb->head].start == ack + sb->snd_una_adv);
TCP_EVT_DBG (TCP_EVT_CC_SCOREBOARD, tc);
tc->snd_wl2 = ack;
TCP_EVT_DBG (TCP_EVT_SND_WND, tc);
- if (tc->snd_wnd < tc->snd_mss)
+ if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
{
/* Set persist timer if not set and we just got 0 wnd */
if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST)
else
{
tcp_persist_timer_reset (tc);
- if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
+ if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
{
tc->rto_boff = 0;
tcp_update_rto (tc);
tcp_fastrecovery_on (tc);
tc->snd_congestion = tc->snd_una_max;
tc->cwnd_acc_bytes = 0;
+ tc->snd_rxt_bytes = 0;
+ tc->prev_ssthresh = tc->ssthresh;
+ tc->prev_cwnd = tc->cwnd;
tc->cc_algo->congestion (tc);
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4);
}
tc->snd_rxt_bytes = 0;
tc->rcv_dupacks = 0;
tc->snd_nxt = tc->snd_una_max;
+ tc->snd_rxt_bytes = 0;
+
tcp_fastrecovery_off (tc);
tcp_fastrecovery_1_smss_off (tc);
+ tcp_fastrecovery_first_off (tc);
+
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
}
tc->rcv_dupacks = 0;
if (tcp_in_recovery (tc))
tcp_cc_recovery_exit (tc);
+ else if (tcp_in_fastrecovery (tc))
+ tcp_cc_fastrecovery_exit (tc);
ASSERT (tc->rto_boff == 0);
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5);
- /* TODO extend for fastrecovery */
}
-static u8
-tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
+static inline u8
+tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc)
{
return (tcp_in_recovery (tc) && tc->rto_boff == 1
&& tc->snd_rxt_ts
&& timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
}
+static inline u8
+tcp_cc_is_spurious_fast_rxt (tcp_connection_t * tc)
+{
+ return (tcp_in_fastrecovery (tc)
+ && tc->cwnd > tc->ssthresh + 3 * tc->snd_mss);
+}
+
+static u8
+tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
+{
+ return (tcp_cc_is_spurious_timeout_rxt (tc)
+ || tcp_cc_is_spurious_fast_rxt (tc));
+}
+
static int
tcp_cc_recover (tcp_connection_t * tc)
{
ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
/* Congestion avoidance */
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ tcp_cc_rcv_ack (tc);
/* If a cumulative ack, make sure dupacks is 0 */
tc->rcv_dupacks = 0;
|| tcp_should_fastrecover_sack (tc));
}
+void
+tcp_program_fastretransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ if (!(tc->flags & TCP_CONN_FRXT_PENDING))
+ {
+ vec_add1 (wrk->pending_fast_rxt, tc->c_c_index);
+ tc->flags |= TCP_CONN_FRXT_PENDING;
+ }
+}
+
+void
+tcp_do_fastretransmits (tcp_worker_ctx_t * wrk)
+{
+ u32 *ongoing_fast_rxt, burst_bytes, sent_bytes, thread_index;
+ u32 max_burst_size, burst_size, n_segs = 0, n_segs_now;
+ tcp_connection_t *tc;
+ u64 last_cpu_time;
+ int i;
+
+ if (vec_len (wrk->pending_fast_rxt) == 0
+ && vec_len (wrk->postponed_fast_rxt) == 0)
+ return;
+
+ thread_index = wrk->vm->thread_index;
+ last_cpu_time = wrk->vm->clib_time.last_cpu_time;
+ ongoing_fast_rxt = wrk->ongoing_fast_rxt;
+ vec_append (ongoing_fast_rxt, wrk->postponed_fast_rxt);
+ vec_append (ongoing_fast_rxt, wrk->pending_fast_rxt);
+
+ _vec_len (wrk->postponed_fast_rxt) = 0;
+ _vec_len (wrk->pending_fast_rxt) = 0;
+
+ max_burst_size = VLIB_FRAME_SIZE / vec_len (ongoing_fast_rxt);
+ max_burst_size = clib_max (max_burst_size, 1);
+
+ for (i = 0; i < vec_len (ongoing_fast_rxt); i++)
+ {
+ if (n_segs >= VLIB_FRAME_SIZE)
+ {
+ vec_add1 (wrk->postponed_fast_rxt, ongoing_fast_rxt[i]);
+ continue;
+ }
+
+ tc = tcp_connection_get (ongoing_fast_rxt[i], thread_index);
+ tc->flags &= ~TCP_CONN_FRXT_PENDING;
+
+ if (!tcp_in_fastrecovery (tc))
+ continue;
+
+ burst_size = clib_min (max_burst_size, VLIB_FRAME_SIZE - n_segs);
+ burst_bytes = transport_connection_tx_pacer_burst (&tc->connection,
+ last_cpu_time);
+ burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss);
+ if (!burst_size)
+ {
+ tcp_program_fastretransmit (wrk, tc);
+ continue;
+ }
+
+ n_segs_now = tcp_fast_retransmit (wrk, tc, burst_size);
+ sent_bytes = clib_min (n_segs_now * tc->snd_mss, burst_bytes);
+ transport_connection_tx_pacer_update_bytes (&tc->connection,
+ sent_bytes);
+ n_segs += n_segs_now;
+ }
+ _vec_len (ongoing_fast_rxt) = 0;
+ wrk->ongoing_fast_rxt = ongoing_fast_rxt;
+}
+
/**
* One function to rule them all ... and in the darkness bind them
*/
{
if (tc->bytes_acked)
goto partial_ack;
- tcp_fast_retransmit (tc);
+ tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc);
return;
}
/*
}
else if (tcp_should_fastrecover (tc))
{
+ u32 pacer_wnd;
+
ASSERT (!tcp_in_fastrecovery (tc));
- /* If of of the two conditions lower hold, reset dupacks because
- * we're probably after timeout (RFC6582 heuristics).
- * If Cumulative ack does not cover more than congestion threshold,
- * and:
- * 1) The following doesn't hold: The congestion window is greater
- * than SMSS bytes and the difference between highest_ack
- * and prev_highest_ack is at most 4*SMSS bytes
- * 2) Echoed timestamp in the last non-dup ack does not equal the
- * stored timestamp
- */
- if (seq_leq (tc->snd_una, tc->snd_congestion)
- && ((!(tc->cwnd > tc->snd_mss
- && tc->bytes_acked <= 4 * tc->snd_mss))
- || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
+ /* Heuristic to catch potential late dupacks
+ * after fast retransmit exits */
+ if (is_dack && tc->snd_una == tc->snd_congestion
+ && timestamp_leq (tc->rcv_opts.tsecr, tc->tsecr_last_ack))
{
tc->rcv_dupacks = 0;
return;
tcp_cc_init_congestion (tc);
tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
- /* The first segment MUST be retransmitted */
- tcp_retransmit_first_unacked (tc);
-
- /* Post retransmit update cwnd to ssthresh and account for the
- * three segments that have left the network and should've been
- * buffered at the receiver XXX */
- tc->cwnd = tc->ssthresh + tc->rcv_dupacks * tc->snd_mss;
- ASSERT (tc->cwnd >= tc->snd_mss);
-
- /* If cwnd allows, send more data */
if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
- scoreboard_init_high_rxt (&tc->sack_sb,
- tc->snd_una + tc->snd_mss);
- tcp_fast_retransmit_sack (tc);
+ tc->cwnd = tc->ssthresh;
+ scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una);
}
else
{
- tcp_fast_retransmit_no_sack (tc);
+ /* Post retransmit update cwnd to ssthresh and account for the
+ * three segments that have left the network and should've been
+ * buffered at the receiver XXX */
+ tc->cwnd = tc->ssthresh + 3 * tc->snd_mss;
}
+
+ /* Constrain rate until we get a partial ack */
+ pacer_wnd = clib_max (0.1 * tc->cwnd, 2 * tc->snd_mss);
+ tcp_connection_tx_pacer_reset (tc, pacer_wnd,
+ 0 /* start bucket */ );
+ tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index),
+ tc);
return;
}
else if (!tc->bytes_acked
else
goto partial_ack;
}
+ /* Don't allow entry in fast recovery if still in recovery, for now */
+ else if (0 && is_dack && tcp_in_recovery (tc))
+ {
+ /* If of of the two conditions lower hold, reset dupacks because
+ * we're probably after timeout (RFC6582 heuristics).
+ * If Cumulative ack does not cover more than congestion threshold,
+ * and:
+ * 1) The following doesn't hold: The congestion window is greater
+ * than SMSS bytes and the difference between highest_ack
+ * and prev_highest_ack is at most 4*SMSS bytes
+ * 2) Echoed timestamp in the last non-dup ack does not equal the
+ * stored timestamp
+ */
+ if (seq_leq (tc->snd_una, tc->snd_congestion)
+ && ((!(tc->cwnd > tc->snd_mss
+ && tc->bytes_acked <= 4 * tc->snd_mss))
+ || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
+ {
+ tc->rcv_dupacks = 0;
+ return;
+ }
+ }
if (!tc->bytes_acked)
return;
/*
* Legitimate ACK. 1) See if we can exit recovery
*/
- /* XXX limit this only to first partial ack? */
- if (seq_lt (tc->snd_una, tc->snd_congestion))
- tcp_retransmit_timer_force_update (tc);
- else
- tcp_retransmit_timer_update (tc);
if (seq_geq (tc->snd_una, tc->snd_congestion))
{
+ tcp_retransmit_timer_update (tc);
+
/* If spurious return, we've already updated everything */
if (tcp_cc_recover (tc))
{
tc->snd_nxt = tc->snd_una_max;
/* Treat as congestion avoidance ack */
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ tcp_cc_rcv_ack (tc);
return;
}
* Legitimate ACK. 2) If PARTIAL ACK try to retransmit
*/
+ /* Update the pacing rate. For the first partial ack we move from
+ * the artificially constrained rate to the one after congestion */
+ tcp_connection_tx_pacer_update (tc);
+
+ /* XXX limit this only to first partial ack? */
+ tcp_retransmit_timer_force_update (tc);
+
/* RFC6675: If the incoming ACK is a cumulative acknowledgment,
* reset dupacks to 0. Also needed if in congestion recovery */
tc->rcv_dupacks = 0;
/* Post RTO timeout don't try anything fancy */
if (tcp_in_recovery (tc))
{
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ tcp_cc_rcv_ack (tc);
transport_add_tx_event (&tc->connection);
return;
}
/* Remove retransmitted bytes that have been delivered */
- ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv
- >= tc->sack_sb.last_bytes_delivered
- || (tc->flags & TCP_CONN_FINSNT));
-
- if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt))
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
+ ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv
+ >= tc->sack_sb.last_bytes_delivered
+ || (tc->flags & TCP_CONN_FINSNT));
+
/* If we have sacks and we haven't gotten an ack beyond high_rxt,
* remove sacked bytes delivered */
- rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv
- - tc->sack_sb.last_bytes_delivered;
- ASSERT (tc->snd_rxt_bytes >= rxt_delivered);
- tc->snd_rxt_bytes -= rxt_delivered;
+ if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt))
+ {
+ rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv
+ - tc->sack_sb.last_bytes_delivered;
+ ASSERT (tc->snd_rxt_bytes >= rxt_delivered);
+ tc->snd_rxt_bytes -= rxt_delivered;
+ }
+ else
+ {
+ /* Apparently all retransmitted holes have been acked */
+ tc->snd_rxt_bytes = 0;
+ tc->sack_sb.high_rxt = tc->snd_una;
+ }
}
else
{
- /* Either all retransmitted holes have been acked, or we're
- * "in the blind" and retransmitting segment by segment */
- tc->snd_rxt_bytes = 0;
+ tcp_fastrecovery_first_on (tc);
+ /* Reuse last bytes delivered to track total bytes acked */
+ tc->sack_sb.last_bytes_delivered += tc->bytes_acked;
+ if (tc->snd_rxt_bytes > tc->bytes_acked)
+ tc->snd_rxt_bytes -= tc->bytes_acked;
+ else
+ tc->snd_rxt_bytes = 0;
}
tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK);
/*
* Since this was a partial ack, try to retransmit some more data
*/
- tcp_fast_retransmit (tc);
+ tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc);
}
/**
* Process incoming ACK
*/
static int
-tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b,
- tcp_header_t * th, u32 * next, u32 * error)
+tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
+ tcp_header_t * th, u32 * error)
{
u32 prev_snd_wnd, prev_snd_una;
u8 is_dack;
* drop it */
if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max))
{
- tcp_make_ack (tc, b);
- *next = tcp_next_output (tc->c_is_ip4);
- *error = TCP_ERROR_ACK_INVALID;
+ tcp_program_ack (wrk, tc);
+ *error = TCP_ERROR_ACK_FUTURE;
TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0,
vnet_buffer (b)->tcp.ack_number);
return -1;
vnet_buffer (b)->tcp.ack_number);
tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
- *error = TCP_ERROR_ACK_FUTURE;
}
/* If old ACK, probably it's an old dupack */
tcp_validate_txf_size (tc, tc->bytes_acked);
if (tc->bytes_acked)
- tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number);
+ {
+ tcp_program_dequeue (wrk, tc);
+ tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number);
+ }
TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc);
if (!tcp_in_cong_recovery (tc))
return 0;
*error = TCP_ERROR_ACK_DUP;
- return vnet_buffer (b)->tcp.data_len ? 0 : -1;
+ if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
+ return 0;
+ return -1;
}
/*
else if (written > data_len)
{
tc->rcv_nxt += written;
-
- /* Send ACK confirming the update */
- tc->flags |= TCP_CONN_SNDACK;
TCP_EVT_DBG (TCP_EVT_CC_INPUT, tc, data_len, written);
}
else if (written > 0)
{
/* We've written something but FIFO is probably full now */
tc->rcv_nxt += written;
-
- /* Depending on how fast the app is, all remaining buffers in burst will
- * not be enqueued. Inform peer */
- tc->flags |= TCP_CONN_SNDACK;
-
error = TCP_ERROR_PARTIALLY_ENQUEUED;
}
else
{
- tc->flags |= TCP_CONN_SNDACK;
return TCP_ERROR_FIFO_FULL;
}
* It handles both in order or out-of-order data.
*/
static int
-tcp_segment_rcv (tcp_connection_t * tc, vlib_buffer_t * b, u32 * next0)
+tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ vlib_buffer_t * b)
{
u32 error, n_bytes_to_drop, n_data_bytes;
* retransmissions since we may not have any data to send */
if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
{
- tcp_make_ack (tc, b);
+ tcp_program_ack (wrk, tc);
error = TCP_ERROR_SEGMENT_OLD;
- *next0 = tcp_next_output (tc->c_is_ip4);
goto done;
}
if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
{
error = TCP_ERROR_SEGMENT_OLD;
- *next0 = tcp_next_drop (tc->c_is_ip4);
goto done;
}
goto in_order;
/* RFC2581: Enqueue and send DUPACK for fast retransmit */
error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
- *next0 = tcp_next_output (tc->c_is_ip4);
- tcp_make_ack (tc, b);
- vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK;
+ tcp_program_dupack (wrk, tc);
TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
goto done;
}
error = tcp_session_enqueue_data (tc, b, n_data_bytes);
if (tcp_can_delack (tc))
{
- *next0 = tcp_next_drop (tc->c_is_ip4);
if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK))
tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME);
goto done;
}
- *next0 = tcp_next_output (tc->c_is_ip4);
- tcp_make_ack (tc, b);
+ tcp_program_ack (wrk, tc);
done:
return error;
vlib_frame_t * frame, int is_ip4)
{
u32 thread_index = vm->thread_index, errors = 0;
- u32 n_left_from, next_index, *from, *to_next;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ u32 n_left_from, *from, *first_buffer;
u16 err_counters[TCP_N_ERROR] = { 0 };
u8 is_fin = 0;
if (node->flags & VLIB_NODE_FLAG_TRACE)
tcp_established_trace_frame (vm, node, frame, is_ip4);
- from = vlib_frame_vector_args (frame);
+ first_buffer = from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
- next_index = node->cached_next_index;
while (n_left_from > 0)
{
- u32 n_left_to_next;
+ u32 bi0, error0 = TCP_ERROR_ACK_OK;
+ vlib_buffer_t *b0;
+ tcp_header_t *th0 = 0;
+ tcp_connection_t *tc0;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
- while (n_left_from > 0 && n_left_to_next > 0)
+ if (n_left_from > 1)
{
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *th0 = 0;
- tcp_connection_t *tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ACK_OK;
-
- if (n_left_from > 1)
- {
- vlib_buffer_t *pb;
- pb = vlib_get_buffer (vm, from[1]);
- vlib_prefetch_buffer_header (pb, LOAD);
- CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
- }
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+ vlib_buffer_t *pb;
+ pb = vlib_get_buffer (vm, from[1]);
+ vlib_prefetch_buffer_header (pb, LOAD);
+ CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
- b0 = vlib_get_buffer (vm, bi0);
- tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
- thread_index);
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto done;
- }
+ b0 = vlib_get_buffer (vm, bi0);
+ tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
+ thread_index);
- th0 = tcp_buffer_hdr (b0);
- /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
- * dangling reference. */
- is_fin = tcp_is_fin (th0);
+ if (PREDICT_FALSE (tc0 == 0))
+ {
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto done;
+ }
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len;
+ th0 = tcp_buffer_hdr (b0);
+ /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
+ * dangling reference. */
+ is_fin = tcp_is_fin (th0);
- /* TODO header prediction fast path */
+ /* SYNs, FINs and data consume sequence numbers */
+ vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
+ + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len;
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0,
- &error0)))
- {
- tcp_maybe_inc_err_counter (err_counters, error0);
- TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp);
- goto done;
- }
+ /* TODO header prediction fast path */
- /* 5: check the ACK field */
- if (PREDICT_FALSE (tcp_rcv_ack (tc0, b0, th0, &next0, &error0)))
- {
- tcp_maybe_inc_err_counter (err_counters, error0);
- goto done;
- }
+ /* 1-4: check SEQ, RST, SYN */
+ if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, th0, &error0)))
+ {
+ TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp);
+ goto done;
+ }
- /* 6: check the URG bit TODO */
+ /* 5: check the ACK field */
+ if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0)))
+ goto done;
- /* 7: process the segment text */
- if (vnet_buffer (b0)->tcp.data_len)
- {
- error0 = tcp_segment_rcv (tc0, b0, &next0);
- tcp_maybe_inc_err_counter (err_counters, error0);
- }
+ /* 6: check the URG bit TODO */
- /* 8: check the FIN bit */
- if (PREDICT_FALSE (is_fin))
- {
- /* Enter CLOSE-WAIT and notify session. To avoid lingering
- * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
- /* Account for the FIN if nothing else was received */
- if (vnet_buffer (b0)->tcp.data_len == 0)
- tc0->rcv_nxt += 1;
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (tc0->c_is_ip4);
- tc0->state = TCP_STATE_CLOSE_WAIT;
- stream_session_disconnect_notify (&tc0->connection);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
- tcp_inc_err_counter (err_counters, TCP_ERROR_FIN_RCVD, 1);
- }
+ /* 7: process the segment text */
+ if (vnet_buffer (b0)->tcp.data_len)
+ error0 = tcp_segment_rcv (wrk, tc0, b0);
- done:
- b0->error = node->errors[error0];
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ /* 8: check the FIN bit */
+ if (PREDICT_FALSE (is_fin))
+ {
+ /* Enter CLOSE-WAIT and notify session. To avoid lingering
+ * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
+ /* Account for the FIN if nothing else was received */
+ if (vnet_buffer (b0)->tcp.data_len == 0)
+ tc0->rcv_nxt += 1;
+ tcp_program_ack (wrk, tc0);
+ tc0->state = TCP_STATE_CLOSE_WAIT;
+ stream_session_disconnect_notify (&tc0->connection);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+ TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
+ error0 = TCP_ERROR_FIN_RCVD;
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ done:
+ tcp_inc_err_counter (err_counters, error0, 1);
}
errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
thread_index);
err_counters[TCP_ERROR_EVENT_FIFO_FULL] = errors;
tcp_store_err_counters (established, err_counters);
- tcp_flush_frame_to_output (vm, thread_index, is_ip4);
+ tcp_handle_postponed_dequeues (wrk);
+ vlib_buffer_free (vm, first_buffer, frame->n_vectors);
return frame->n_vectors;
}
vlib_frame_t * from_frame, int is_ip4)
{
tcp_main_t *tm = vnet_get_tcp_main ();
- u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->thread_index, errors = 0;
+ u32 n_left_from, *from, *first_buffer, errors = 0;
+ u32 my_thread_index = vm->thread_index;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (my_thread_index);
- from = vlib_frame_vector_args (from_frame);
+ from = first_buffer = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
- next_index = node->cached_next_index;
-
while (n_left_from > 0)
{
- u32 n_left_to_next;
+ u32 bi0, ack0, seq0, error0 = TCP_ERROR_NONE;
+ tcp_connection_t *tc0, *new_tc0;
+ tcp_header_t *tcp0 = 0;
+ tcp_rx_trace_t *t0;
+ vlib_buffer_t *b0;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
- while (n_left_from > 0 && n_left_to_next > 0)
+ b0 = vlib_get_buffer (vm, bi0);
+ tc0 =
+ tcp_half_open_connection_get (vnet_buffer (b0)->tcp.connection_index);
+ if (PREDICT_FALSE (tc0 == 0))
{
- u32 bi0, ack0, seq0;
- vlib_buffer_t *b0;
- tcp_rx_trace_t *t0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- tcp_connection_t *new_tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ENQUEUED;
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
- tc0 =
- tcp_half_open_connection_get (vnet_buffer (b0)->
- tcp.connection_index);
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto drop;
- }
-
- /* Half-open completed recently but the connection was't removed
- * yet by the owning thread */
- if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE))
- {
- /* Make sure the connection actually exists */
- ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0,
- my_thread_index, is_ip4));
- goto drop;
- }
-
- ack0 = vnet_buffer (b0)->tcp.ack_number;
- seq0 = vnet_buffer (b0)->tcp.seq_number;
- tcp0 = tcp_buffer_hdr (b0);
-
- /* Crude check to see if the connection handle does not match
- * the packet. Probably connection just switched to established */
- if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port
- || tcp0->src_port != tc0->c_rmt_port))
- goto drop;
-
- if (PREDICT_FALSE
- (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0)))
- goto drop;
-
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = seq0 + tcp_is_syn (tcp0)
- + tcp_is_fin (tcp0) + vnet_buffer (b0)->tcp.data_len;
-
- /*
- * 1. check the ACK bit
- */
-
- /*
- * If the ACK bit is set
- * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
- * the RST bit is set, if so drop the segment and return)
- * <SEQ=SEG.ACK><CTL=RST>
- * and discard the segment. Return.
- * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
- */
- if (tcp_ack (tcp0))
- {
- if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt))
- {
- clib_warning ("ack not in rcv wnd");
- if (!tcp_rst (tcp0))
- tcp_send_reset_w_pkt (tc0, b0, is_ip4);
- goto drop;
- }
-
- /* Make sure ACK is valid */
- if (seq_gt (tc0->snd_una, ack0))
- {
- clib_warning ("ack invalid");
- goto drop;
- }
- }
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
- /*
- * 2. check the RST bit
- */
+ /* Half-open completed recently but the connection was't removed
+ * yet by the owning thread */
+ if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE))
+ {
+ /* Make sure the connection actually exists */
+ ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0,
+ my_thread_index, is_ip4));
+ goto drop;
+ }
- if (tcp_rst (tcp0))
- {
- /* If ACK is acceptable, signal client that peer is not
- * willing to accept connection and drop connection*/
- if (tcp_ack (tcp0))
- tcp_connection_reset (tc0);
- goto drop;
- }
+ ack0 = vnet_buffer (b0)->tcp.ack_number;
+ seq0 = vnet_buffer (b0)->tcp.seq_number;
+ tcp0 = tcp_buffer_hdr (b0);
- /*
- * 3. check the security and precedence (skipped)
- */
+ /* Crude check to see if the connection handle does not match
+ * the packet. Probably connection just switched to established */
+ if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port
+ || tcp0->src_port != tc0->c_rmt_port))
+ {
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
- /*
- * 4. check the SYN bit
- */
+ if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0)
+ && !tcp_syn (tcp0)))
+ {
+ error0 = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /* No SYN flag. Drop. */
- if (!tcp_syn (tcp0))
+ /* SYNs, FINs and data consume sequence numbers */
+ vnet_buffer (b0)->tcp.seq_end =
+ seq0 + tcp_is_syn (tcp0) + tcp_is_fin (tcp0) +
+ vnet_buffer (b0)->tcp.data_len;
+
+ /*
+ * 1. check the ACK bit
+ */
+
+ /*
+ * If the ACK bit is set
+ * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
+ * the RST bit is set, if so drop the segment and return)
+ * <SEQ=SEG.ACK><CTL=RST>
+ * and discard the segment. Return.
+ * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
+ */
+ if (tcp_ack (tcp0))
+ {
+ if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt))
{
- clib_warning ("not synack");
+ if (!tcp_rst (tcp0))
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ error0 = TCP_ERROR_RCV_WND;
goto drop;
}
- /* Parse options */
- if (tcp_options_parse (tcp0, &tc0->rcv_opts))
+ /* Make sure ACK is valid */
+ if (seq_gt (tc0->snd_una, ack0))
{
- clib_warning ("options parse fail");
+ error0 = TCP_ERROR_ACK_INVALID;
goto drop;
}
+ }
- /* Valid SYN or SYN-ACK. Move connection from half-open pool to
- * current thread pool. */
- pool_get (tm->connections[my_thread_index], new_tc0);
- clib_memcpy (new_tc0, tc0, sizeof (*new_tc0));
- new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index];
- new_tc0->c_thread_index = my_thread_index;
- new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
- new_tc0->irs = seq0;
- new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
- new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] =
- TCP_TIMER_HANDLE_INVALID;
- new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-
- /* If this is not the owning thread, wait for syn retransmit to
- * expire and cleanup then */
- if (tcp_half_open_connection_cleanup (tc0))
- tc0->flags |= TCP_CONN_HALF_OPEN_DONE;
-
- if (tcp_opts_tstamp (&new_tc0->rcv_opts))
- {
- new_tc0->tsval_recent = new_tc0->rcv_opts.tsval;
- new_tc0->tsval_recent_age = tcp_time_now ();
- }
+ /*
+ * 2. check the RST bit
+ */
- if (tcp_opts_wscale (&new_tc0->rcv_opts))
- new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
+ if (tcp_rst (tcp0))
+ {
+ /* If ACK is acceptable, signal client that peer is not
+ * willing to accept connection and drop connection*/
+ if (tcp_ack (tcp0))
+ tcp_connection_reset (tc0);
+ error0 = TCP_ERROR_RST_RCVD;
+ goto drop;
+ }
- /* RFC1323: SYN and SYN-ACK wnd not scaled */
- new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window);
- new_tc0->snd_wl1 = seq0;
- new_tc0->snd_wl2 = ack0;
+ /*
+ * 3. check the security and precedence (skipped)
+ */
- tcp_connection_init_vars (new_tc0);
+ /*
+ * 4. check the SYN bit
+ */
- /* SYN-ACK: See if we can switch to ESTABLISHED state */
- if (PREDICT_TRUE (tcp_ack (tcp0)))
- {
- /* Our SYN is ACKed: we have iss < ack = snd_una */
+ /* No SYN flag. Drop. */
+ if (!tcp_syn (tcp0))
+ {
+ clib_warning ("not synack");
+ error0 = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /* TODO Dequeue acknowledged segments if we support Fast Open */
- new_tc0->snd_una = ack0;
- new_tc0->state = TCP_STATE_ESTABLISHED;
+ /* Parse options */
+ if (tcp_options_parse (tcp0, &tc0->rcv_opts))
+ {
+ clib_warning ("options parse fail");
+ error0 = TCP_ERROR_OPTIONS;
+ goto drop;
+ }
- /* Make sure las is initialized for the wnd computation */
- new_tc0->rcv_las = new_tc0->rcv_nxt;
+ /* Valid SYN or SYN-ACK. Move connection from half-open pool to
+ * current thread pool. */
+ pool_get (tm->connections[my_thread_index], new_tc0);
+ clib_memcpy (new_tc0, tc0, sizeof (*new_tc0));
+ new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index];
+ new_tc0->c_thread_index = my_thread_index;
+ new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
+ new_tc0->irs = seq0;
+ new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
+ new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
+ new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ /* If this is not the owning thread, wait for syn retransmit to
+ * expire and cleanup then */
+ if (tcp_half_open_connection_cleanup (tc0))
+ tc0->flags |= TCP_CONN_HALF_OPEN_DONE;
+
+ if (tcp_opts_tstamp (&new_tc0->rcv_opts))
+ {
+ new_tc0->tsval_recent = new_tc0->rcv_opts.tsval;
+ new_tc0->tsval_recent_age = tcp_time_now ();
+ }
- /* Notify app that we have connection. If session layer can't
- * allocate session send reset */
- if (session_stream_connect_notify (&new_tc0->connection, 0))
- {
- clib_warning ("connect notify fail");
- tcp_send_reset_w_pkt (new_tc0, b0, is_ip4);
- tcp_connection_cleanup (new_tc0);
- goto drop;
- }
+ if (tcp_opts_wscale (&new_tc0->rcv_opts))
+ new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
- /* Make sure after data segment processing ACK is sent */
- new_tc0->flags |= TCP_CONN_SNDACK;
+ new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
+ << new_tc0->snd_wscale;
+ new_tc0->snd_wl1 = seq0;
+ new_tc0->snd_wl2 = ack0;
- /* Update rtt with the syn-ack sample */
- tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number);
- TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0);
- }
- /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
- else
- {
- new_tc0->state = TCP_STATE_SYN_RCVD;
+ tcp_connection_init_vars (new_tc0);
- /* Notify app that we have connection */
- if (session_stream_connect_notify (&new_tc0->connection, 0))
- {
- tcp_connection_cleanup (new_tc0);
- tcp_send_reset_w_pkt (tc0, b0, is_ip4);
- TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0);
- goto drop;
- }
+ /* SYN-ACK: See if we can switch to ESTABLISHED state */
+ if (PREDICT_TRUE (tcp_ack (tcp0)))
+ {
+ /* Our SYN is ACKed: we have iss < ack = snd_una */
- tc0->rtt_ts = 0;
- tcp_init_snd_vars (tc0);
- tcp_make_synack (new_tc0, b0);
- next0 = tcp_next_output (is_ip4);
+ /* TODO Dequeue acknowledged segments if we support Fast Open */
+ new_tc0->snd_una = ack0;
+ new_tc0->state = TCP_STATE_ESTABLISHED;
- goto drop;
- }
+ /* Make sure las is initialized for the wnd computation */
+ new_tc0->rcv_las = new_tc0->rcv_nxt;
- /* Read data, if any */
- if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len))
- {
- clib_warning ("rcvd data in syn-sent");
- error0 = tcp_segment_rcv (new_tc0, b0, &next0);
- if (error0 == TCP_ERROR_ACK_OK)
- error0 = TCP_ERROR_SYN_ACKS_RCVD;
- tcp_maybe_inc_counter (syn_sent, error0, 1);
- }
- else
+ /* Notify app that we have connection. If session layer can't
+ * allocate session send reset */
+ if (session_stream_connect_notify (&new_tc0->connection, 0))
{
- tcp_make_ack (new_tc0, b0);
- next0 = tcp_next_output (new_tc0->c_is_ip4);
+ clib_warning ("connect notify fail");
+ tcp_send_reset_w_pkt (new_tc0, b0, is_ip4);
+ tcp_connection_cleanup (new_tc0);
+ goto drop;
}
- drop:
+ /* Update rtt with the syn-ack sample */
+ tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number);
+ TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0);
+ error0 = TCP_ERROR_SYN_ACKS_RCVD;
+ }
+ /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
+ else
+ {
+ new_tc0->state = TCP_STATE_SYN_RCVD;
- b0->error = error0 ? node->errors[error0] : 0;
- if (PREDICT_FALSE
- ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0))
+ /* Notify app that we have connection */
+ if (session_stream_connect_notify (&new_tc0->connection, 0))
{
- t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
- clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header));
- clib_memcpy (&t0->tcp_connection, tc0,
- sizeof (t0->tcp_connection));
+ tcp_connection_cleanup (new_tc0);
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0);
+ goto drop;
}
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ tc0->rtt_ts = 0;
+ tcp_init_snd_vars (tc0);
+ tcp_send_synack (new_tc0);
+ error0 = TCP_ERROR_SYNS_RCVD;
+ goto drop;
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ /* Read data, if any */
+ if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len))
+ {
+ clib_warning ("rcvd data in syn-sent");
+ error0 = tcp_segment_rcv (wrk, new_tc0, b0);
+ if (error0 == TCP_ERROR_ACK_OK)
+ error0 = TCP_ERROR_SYN_ACKS_RCVD;
+ }
+ else
+ {
+ tcp_program_ack (wrk, new_tc0);
+ }
+
+ drop:
+
+ tcp_inc_counter (syn_sent, error0, 1);
+ if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0))
+ {
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header));
+ clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection));
+ }
}
errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
my_thread_index);
tcp_inc_counter (syn_sent, TCP_ERROR_EVENT_FIFO_FULL, errors);
+ vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
+
return from_frame->n_vectors;
}
tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame, int is_ip4)
{
- u32 n_left_from, next_index, *from, *to_next, n_fins = 0;
- u32 my_thread_index = vm->thread_index, errors = 0;
+ u32 thread_index = vm->thread_index, errors = 0, *first_buffer;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ u32 n_left_from, *from;
- from = vlib_frame_vector_args (from_frame);
+ from = first_buffer = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
- next_index = node->cached_next_index;
while (n_left_from > 0)
{
- u32 n_left_to_next;
+ u32 bi0, error0 = TCP_ERROR_NONE;
+ tcp_header_t *tcp0 = 0;
+ tcp_connection_t *tc0;
+ vlib_buffer_t *b0;
+ u8 is_fin0;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
- while (n_left_from > 0 && n_left_to_next > 0)
+ b0 = vlib_get_buffer (vm, bi0);
+ tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
+ thread_index);
+ if (PREDICT_FALSE (tc0 == 0))
{
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_NONE;
- u8 is_fin0;
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+ tcp0 = tcp_buffer_hdr (b0);
+ is_fin0 = tcp_is_fin (tcp0);
- b0 = vlib_get_buffer (vm, bi0);
- tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
- my_thread_index);
- if (PREDICT_FALSE (tc0 == 0))
+ /* SYNs, FINs and data consume sequence numbers */
+ vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
+ + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len;
+
+ if (CLIB_DEBUG)
+ {
+ tcp_connection_t *tmp;
+ tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index,
+ is_ip4);
+ if (tmp->state != tc0->state)
{
- error0 = TCP_ERROR_INVALID_CONNECTION;
+ clib_warning ("state changed");
goto drop;
}
+ }
- tcp0 = tcp_buffer_hdr (b0);
- is_fin0 = tcp_is_fin (tcp0);
+ /*
+ * Special treatment for CLOSED
+ */
+ if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
+ {
+ error0 = TCP_ERROR_CONNECTION_CLOSED;
+ goto drop;
+ }
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len;
+ /*
+ * For all other states (except LISTEN)
+ */
- if (CLIB_DEBUG)
- {
- tcp_connection_t *tmp;
- tmp = tcp_lookup_connection (tc0->c_fib_index, b0,
- my_thread_index, is_ip4);
- if (tmp->state != tc0->state)
- {
- clib_warning ("state changed");
- goto drop;
- }
- }
+ /* 1-4: check SEQ, RST, SYN */
+ if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, tcp0, &error0)))
+ goto drop;
+ /* 5: check the ACK field */
+ switch (tc0->state)
+ {
+ case TCP_STATE_SYN_RCVD:
/*
- * Special treatment for CLOSED
+ * If the segment acknowledgment is not acceptable, form a
+ * reset segment,
+ * <SEQ=SEG.ACK><CTL=RST>
+ * and send it.
*/
- if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
+ if (!tcp_rcv_ack_is_acceptable (tc0, b0))
{
- error0 = TCP_ERROR_CONNECTION_CLOSED;
+ TCP_DBG ("connection not accepted");
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ error0 = TCP_ERROR_ACK_INVALID;
goto drop;
}
- /*
- * For all other states (except LISTEN)
- */
+ /* Update rtt and rto */
+ tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number);
+
+ /* Switch state to ESTABLISHED */
+ tc0->state = TCP_STATE_ESTABLISHED;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+
+ /* Initialize session variables */
+ tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
+ tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
+ << tc0->rcv_opts.wscale;
+ tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
+ tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
+
+ /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
+ tcp_retransmit_timer_reset (tc0);
+ tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
+ stream_session_accept_notify (&tc0->connection);
+ error0 = TCP_ERROR_ACK_OK;
+ break;
+ case TCP_STATE_ESTABLISHED:
+ /* We can get packets in established state here because they
+ * were enqueued before state change */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
+
+ break;
+ case TCP_STATE_FIN_WAIT_1:
+ /* In addition to the processing for the ESTABLISHED state, if
+ * our FIN is now acknowledged then enter FIN-WAIT-2 and
+ * continue processing in that state. */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0,
- &next0, &error0)))
+ /* Still have to send the FIN */
+ if (tc0->flags & TCP_CONN_FINPNDG)
{
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
+ /* TX fifo finally drained */
+ if (!session_tx_fifo_max_dequeue (&tc0->connection))
+ tcp_send_fin (tc0);
}
-
- /* 5: check the ACK field */
- switch (tc0->state)
+ /* If FIN is ACKed */
+ else if (tc0->snd_una == tc0->snd_una_max)
{
- case TCP_STATE_SYN_RCVD:
- /*
- * If the segment acknowledgment is not acceptable, form a
- * reset segment,
- * <SEQ=SEG.ACK><CTL=RST>
- * and send it.
- */
- if (!tcp_rcv_ack_is_acceptable (tc0, b0))
- {
- TCP_DBG ("connection not accepted");
- tcp_send_reset_w_pkt (tc0, b0, is_ip4);
- error0 = TCP_ERROR_ACK_INVALID;
- goto drop;
- }
-
- /* Update rtt and rto */
- tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number);
-
- /* Switch state to ESTABLISHED */
- tc0->state = TCP_STATE_ESTABLISHED;
+ tc0->state = TCP_STATE_FIN_WAIT_2;
TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- /* Initialize session variables */
- tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
- tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
- << tc0->rcv_opts.wscale;
- tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
- tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
-
- /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
- tcp_retransmit_timer_reset (tc0);
- tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
- stream_session_accept_notify (&tc0->connection);
- error0 = TCP_ERROR_ACK_OK;
- break;
- case TCP_STATE_ESTABLISHED:
- /* We can get packets in established state here because they
- * were enqueued before state change */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
-
- break;
- case TCP_STATE_FIN_WAIT_1:
- /* In addition to the processing for the ESTABLISHED state, if
- * our FIN is now acknowledged then enter FIN-WAIT-2 and
- * continue processing in that state. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
+ /* Stop all retransmit timers because we have nothing more
+ * to send. Enable waitclose though because we're willing to
+ * wait for peer's FIN but not indefinitely. */
+ tcp_connection_timers_reset (tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ }
+ break;
+ case TCP_STATE_FIN_WAIT_2:
+ /* In addition to the processing for the ESTABLISHED state, if
+ * the retransmission queue is empty, the user's CLOSE can be
+ * acknowledged ("ok") but do not delete the TCB. */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ /* Do the same processing as for the ESTABLISHED state. */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
- /* Still have to send the FIN */
- if (tc0->flags & TCP_CONN_FINPNDG)
- {
- /* TX fifo finally drained */
- if (!session_tx_fifo_max_dequeue (&tc0->connection))
- tcp_send_fin (tc0);
- }
- /* If FIN is ACKed */
- else if (tc0->snd_una == tc0->snd_una_max)
+ if (tc0->flags & TCP_CONN_FINPNDG)
+ {
+ /* TX fifo finally drained */
+ if (!session_tx_fifo_max_dequeue (&tc0->connection))
{
- tc0->state = TCP_STATE_FIN_WAIT_2;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
-
- /* Stop all retransmit timers because we have nothing more
- * to send. Enable waitclose though because we're willing to
- * wait for peer's FIN but not indefinitely. */
+ tcp_send_fin (tc0);
tcp_connection_timers_reset (tc0);
+ tc0->state = TCP_STATE_LAST_ACK;
tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
}
- break;
- case TCP_STATE_FIN_WAIT_2:
- /* In addition to the processing for the ESTABLISHED state, if
- * the retransmission queue is empty, the user's CLOSE can be
- * acknowledged ("ok") but do not delete the TCB. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
- break;
- case TCP_STATE_CLOSE_WAIT:
- /* Do the same processing as for the ESTABLISHED state. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
- if (tc0->flags & TCP_CONN_FINPNDG)
- {
- /* TX fifo finally drained */
- if (!session_tx_fifo_max_dequeue (&tc0->connection))
- {
- tcp_send_fin (tc0);
- tcp_connection_timers_reset (tc0);
- tc0->state = TCP_STATE_LAST_ACK;
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE,
- TCP_2MSL_TIME);
- }
- }
- break;
- case TCP_STATE_CLOSING:
- /* In addition to the processing for the ESTABLISHED state, if
- * the ACK acknowledges our FIN then enter the TIME-WAIT state,
- * otherwise ignore the segment. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
-
- tc0->state = TCP_STATE_TIME_WAIT;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- goto drop;
-
- break;
- case TCP_STATE_LAST_ACK:
- /* The only thing that [should] arrive in this state is an
- * acknowledgment of our FIN. If our FIN is now acknowledged,
- * delete the TCB, enter the CLOSED state, and return. */
+ }
+ break;
+ case TCP_STATE_CLOSING:
+ /* In addition to the processing for the ESTABLISHED state, if
+ * the ACK acknowledges our FIN then enter the TIME-WAIT state,
+ * otherwise ignore the segment. */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
- if (!tcp_rcv_ack_is_acceptable (tc0, b0))
- {
- error0 = TCP_ERROR_ACK_INVALID;
- goto drop;
- }
- error0 = TCP_ERROR_ACK_OK;
- tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
- /* Apparently our ACK for the peer's FIN was lost */
- if (is_fin0 && tc0->snd_una != tc0->snd_una_max)
- {
- tcp_send_fin (tc0);
- goto drop;
- }
+ tc0->state = TCP_STATE_TIME_WAIT;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ goto drop;
- tc0->state = TCP_STATE_CLOSED;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- /* Delete the connection/session since the pipes should be
- * clear by now */
- tcp_connection_del (tc0);
+ break;
+ case TCP_STATE_LAST_ACK:
+ /* The only thing that [should] arrive in this state is an
+ * acknowledgment of our FIN. If our FIN is now acknowledged,
+ * delete the TCB, enter the CLOSED state, and return. */
+ if (!tcp_rcv_ack_is_acceptable (tc0, b0))
+ {
+ error0 = TCP_ERROR_ACK_INVALID;
+ goto drop;
+ }
+ error0 = TCP_ERROR_ACK_OK;
+ tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
+ /* Apparently our ACK for the peer's FIN was lost */
+ if (is_fin0 && tc0->snd_una != tc0->snd_una_max)
+ {
+ tcp_send_fin (tc0);
goto drop;
+ }
- break;
- case TCP_STATE_TIME_WAIT:
- /* The only thing that can arrive in this state is a
- * retransmission of the remote FIN. Acknowledge it, and restart
- * the 2 MSL timeout. */
+ tc0->state = TCP_STATE_CLOSED;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
+ /* Don't free the connection from the data path since
+ * we can't ensure that we have no packets already enqueued
+ * to output. Rely instead on the waitclose timer */
+ tcp_connection_timers_reset (tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, 1);
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- goto drop;
+ goto drop;
- break;
- default:
- ASSERT (0);
- }
+ break;
+ case TCP_STATE_TIME_WAIT:
+ /* The only thing that can arrive in this state is a
+ * retransmission of the remote FIN. Acknowledge it, and restart
+ * the 2 MSL timeout. */
- /* 6: check the URG bit TODO */
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
+ goto drop;
- /* 7: process the segment text */
- switch (tc0->state)
- {
- case TCP_STATE_ESTABLISHED:
- case TCP_STATE_FIN_WAIT_1:
- case TCP_STATE_FIN_WAIT_2:
- if (vnet_buffer (b0)->tcp.data_len)
- {
- error0 = tcp_segment_rcv (tc0, b0, &next0);
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- }
- else if (is_fin0)
- tc0->rcv_nxt += 1;
- break;
- case TCP_STATE_CLOSE_WAIT:
- case TCP_STATE_CLOSING:
- case TCP_STATE_LAST_ACK:
- case TCP_STATE_TIME_WAIT:
- /* This should not occur, since a FIN has been received from the
- * remote side. Ignore the segment text. */
- break;
- }
+ tcp_program_ack (wrk, tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ goto drop;
- /* 8: check the FIN bit */
- if (!is_fin0)
- goto drop;
+ break;
+ default:
+ ASSERT (0);
+ }
- switch (tc0->state)
- {
- case TCP_STATE_ESTABLISHED:
- case TCP_STATE_SYN_RCVD:
- /* Send FIN-ACK notify app and enter CLOSE-WAIT */
- tcp_connection_timers_reset (tc0);
- tcp_make_fin (tc0, b0);
- tc0->snd_nxt += 1;
- tc0->snd_una_max = tc0->snd_nxt;
- tcp_retransmit_timer_set (tc0);
- next0 = tcp_next_output (tc0->c_is_ip4);
- stream_session_disconnect_notify (&tc0->connection);
- tc0->state = TCP_STATE_CLOSE_WAIT;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- break;
- case TCP_STATE_CLOSE_WAIT:
- case TCP_STATE_CLOSING:
- case TCP_STATE_LAST_ACK:
- /* move along .. */
- break;
- case TCP_STATE_FIN_WAIT_1:
- tc0->state = TCP_STATE_CLOSING;
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- /* Wait for ACK but not forever */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
- break;
- case TCP_STATE_FIN_WAIT_2:
- /* Got FIN, send ACK! Be more aggressive with resource cleanup */
- tc0->state = TCP_STATE_TIME_WAIT;
- tcp_connection_timers_reset (tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- break;
- case TCP_STATE_TIME_WAIT:
- /* Remain in the TIME-WAIT state. Restart the time-wait
- * timeout.
- */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- break;
- }
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
- n_fins += 1;
+ /* 6: check the URG bit TODO */
- drop:
- b0->error = error0 ? node->errors[error0] : 0;
+ /* 7: process the segment text */
+ switch (tc0->state)
+ {
+ case TCP_STATE_ESTABLISHED:
+ case TCP_STATE_FIN_WAIT_1:
+ case TCP_STATE_FIN_WAIT_2:
+ if (vnet_buffer (b0)->tcp.data_len)
+ error0 = tcp_segment_rcv (wrk, tc0, b0);
+ else if (is_fin0)
+ tc0->rcv_nxt += 1;
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_CLOSING:
+ case TCP_STATE_LAST_ACK:
+ case TCP_STATE_TIME_WAIT:
+ /* This should not occur, since a FIN has been received from the
+ * remote side. Ignore the segment text. */
+ break;
+ }
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- tcp_rx_trace_t *t0 =
- vlib_add_trace (vm, node, b0, sizeof (*t0));
- tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4);
- }
+ /* 8: check the FIN bit */
+ if (!is_fin0)
+ goto drop;
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ switch (tc0->state)
+ {
+ case TCP_STATE_ESTABLISHED:
+ case TCP_STATE_SYN_RCVD:
+ /* Send FIN-ACK notify app and enter CLOSE-WAIT */
+ tcp_connection_timers_reset (tc0);
+ tcp_send_fin (tc0);
+ stream_session_disconnect_notify (&tc0->connection);
+ tc0->state = TCP_STATE_CLOSE_WAIT;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_CLOSING:
+ case TCP_STATE_LAST_ACK:
+ /* move along .. */
+ break;
+ case TCP_STATE_FIN_WAIT_1:
+ tc0->state = TCP_STATE_CLOSING;
+ tcp_program_ack (wrk, tc0);
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ /* Wait for ACK but not forever */
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ break;
+ case TCP_STATE_FIN_WAIT_2:
+ /* Got FIN, send ACK! Be more aggressive with resource cleanup */
+ tc0->state = TCP_STATE_TIME_WAIT;
+ tcp_connection_timers_reset (tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ tcp_program_ack (wrk, tc0);
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ break;
+ case TCP_STATE_TIME_WAIT:
+ /* Remain in the TIME-WAIT state. Restart the time-wait
+ * timeout.
+ */
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ break;
}
+ error0 = TCP_ERROR_FIN_RCVD;
+ TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
+
+ drop:
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ tcp_inc_counter (rcv_process, error0, 1);
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ tcp_rx_trace_t *t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4);
+ }
}
errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
- my_thread_index);
+ thread_index);
tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors);
- tcp_inc_counter (rcv_process, TCP_ERROR_FIN_RCVD, n_fins);
+ tcp_handle_postponed_dequeues (wrk);
+ vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
+
return from_frame->n_vectors;
}
tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame, int is_ip4)
{
- u32 n_left_from, next_index, *from, *to_next, n_syns = 0;
+ u32 n_left_from, *from, n_syns = 0, *first_buffer;
u32 my_thread_index = vm->thread_index;
- from = vlib_frame_vector_args (from_frame);
+ from = first_buffer = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
- next_index = node->cached_next_index;
-
while (n_left_from > 0)
{
- u32 n_left_to_next;
-
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- while (n_left_from > 0 && n_left_to_next > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_rx_trace_t *t0;
- tcp_header_t *th0 = 0;
- tcp_connection_t *lc0;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- tcp_connection_t *child0;
- u32 error0 = TCP_ERROR_NONE, next0 = tcp_next_drop (is_ip4);
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+ u32 bi0;
+ vlib_buffer_t *b0;
+ tcp_rx_trace_t *t0;
+ tcp_header_t *th0 = 0;
+ tcp_connection_t *lc0;
+ ip4_header_t *ip40;
+ ip6_header_t *ip60;
+ tcp_connection_t *child0;
+ u32 error0 = TCP_ERROR_NONE;
- b0 = vlib_get_buffer (vm, bi0);
- lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index);
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
- if (is_ip4)
- {
- ip40 = vlib_buffer_get_current (b0);
- th0 = ip4_next_header (ip40);
- }
- else
- {
- ip60 = vlib_buffer_get_current (b0);
- th0 = ip6_next_header (ip60);
- }
+ b0 = vlib_get_buffer (vm, bi0);
+ lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index);
- /* Create child session. For syn-flood protection use filter */
+ if (is_ip4)
+ {
+ ip40 = vlib_buffer_get_current (b0);
+ th0 = ip4_next_header (ip40);
+ }
+ else
+ {
+ ip60 = vlib_buffer_get_current (b0);
+ th0 = ip6_next_header (ip60);
+ }
- /* 1. first check for an RST: handled in dispatch */
- /* if (tcp_rst (th0))
- goto drop; */
+ /* Create child session. For syn-flood protection use filter */
- /* 2. second check for an ACK: handled in dispatch */
- /* if (tcp_ack (th0))
- {
- tcp_send_reset (b0, is_ip4);
- goto drop;
- } */
+ /* 1. first check for an RST: handled in dispatch */
+ /* if (tcp_rst (th0))
+ goto drop;
+ */
- /* 3. check for a SYN (did that already) */
+ /* 2. second check for an ACK: handled in dispatch */
+ /* if (tcp_ack (th0))
+ {
+ tcp_send_reset (b0, is_ip4);
+ goto drop;
+ }
+ */
- /* Make sure connection wasn't just created */
- child0 = tcp_lookup_connection (lc0->c_fib_index, b0,
- my_thread_index, is_ip4);
- if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN))
- {
- error0 = TCP_ERROR_CREATE_EXISTS;
- goto drop;
- }
+ /* 3. check for a SYN (did that already) */
- /* Create child session and send SYN-ACK */
- child0 = tcp_connection_new (my_thread_index);
- child0->c_lcl_port = th0->dst_port;
- child0->c_rmt_port = th0->src_port;
- child0->c_is_ip4 = is_ip4;
- child0->state = TCP_STATE_SYN_RCVD;
- child0->c_fib_index = lc0->c_fib_index;
+ /* Make sure connection wasn't just created */
+ child0 = tcp_lookup_connection (lc0->c_fib_index, b0, my_thread_index,
+ is_ip4);
+ if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN))
+ {
+ error0 = TCP_ERROR_CREATE_EXISTS;
+ goto drop;
+ }
- if (is_ip4)
- {
- child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32;
- child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32;
- }
- else
- {
- clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address,
- sizeof (ip6_address_t));
- clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address,
- sizeof (ip6_address_t));
- }
+ /* Create child session and send SYN-ACK */
+ child0 = tcp_connection_new (my_thread_index);
+ child0->c_lcl_port = th0->dst_port;
+ child0->c_rmt_port = th0->src_port;
+ child0->c_is_ip4 = is_ip4;
+ child0->state = TCP_STATE_SYN_RCVD;
+ child0->c_fib_index = lc0->c_fib_index;
- if (tcp_options_parse (th0, &child0->rcv_opts))
- {
- clib_warning ("options parse fail");
- goto drop;
- }
+ if (is_ip4)
+ {
+ child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32;
+ child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32;
+ }
+ else
+ {
+ clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address,
+ sizeof (ip6_address_t));
+ clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address,
+ sizeof (ip6_address_t));
+ }
- child0->irs = vnet_buffer (b0)->tcp.seq_number;
- child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1;
- child0->rcv_las = child0->rcv_nxt;
- child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ if (tcp_options_parse (th0, &child0->rcv_opts))
+ {
+ clib_warning ("options parse fail");
+ goto drop;
+ }
- /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK}
- * segments are used to initialize PAWS. */
- if (tcp_opts_tstamp (&child0->rcv_opts))
- {
- child0->tsval_recent = child0->rcv_opts.tsval;
- child0->tsval_recent_age = tcp_time_now ();
- }
+ child0->irs = vnet_buffer (b0)->tcp.seq_number;
+ child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1;
+ child0->rcv_las = child0->rcv_nxt;
+ child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- if (tcp_opts_wscale (&child0->rcv_opts))
- child0->snd_wscale = child0->rcv_opts.wscale;
+ /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK}
+ * segments are used to initialize PAWS. */
+ if (tcp_opts_tstamp (&child0->rcv_opts))
+ {
+ child0->tsval_recent = child0->rcv_opts.tsval;
+ child0->tsval_recent_age = tcp_time_now ();
+ }
- child0->snd_wnd = clib_net_to_host_u16 (th0->window)
- << child0->snd_wscale;
- child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
- child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
+ if (tcp_opts_wscale (&child0->rcv_opts))
+ child0->snd_wscale = child0->rcv_opts.wscale;
- tcp_connection_init_vars (child0);
- TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1);
+ child0->snd_wnd = clib_net_to_host_u16 (th0->window)
+ << child0->snd_wscale;
+ child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
+ child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
- if (stream_session_accept (&child0->connection, lc0->c_s_index,
- 0 /* notify */ ))
- {
- clib_warning ("session accept fail");
- tcp_connection_cleanup (child0);
- error0 = TCP_ERROR_CREATE_SESSION_FAIL;
- goto drop;
- }
+ tcp_connection_init_vars (child0);
+ TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1);
- /* Reuse buffer to make syn-ack and send */
- tcp_make_synack (child0, b0);
- next0 = tcp_next_output (is_ip4);
- tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME);
+ if (stream_session_accept (&child0->connection, lc0->c_s_index,
+ 0 /* notify */ ))
+ {
+ clib_warning ("session accept fail");
+ tcp_connection_cleanup (child0);
+ error0 = TCP_ERROR_CREATE_SESSION_FAIL;
+ goto drop;
+ }
- drop:
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
- clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
- clib_memcpy (&t0->tcp_connection, lc0,
- sizeof (t0->tcp_connection));
- }
+ tcp_send_synack (child0);
+ tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME);
- n_syns += (error0 == TCP_ERROR_NONE);
- b0->error = node->errors[error0];
+ drop:
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
+ clib_memcpy (&t0->tcp_connection, lc0, sizeof (t0->tcp_connection));
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ n_syns += (error0 == TCP_ERROR_NONE);
}
tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns);
+ vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
+
return from_frame->n_vectors;
}
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 nexts[VLIB_FRAME_SIZE], *next;
- tcp_set_time_now (thread_index);
+ tcp_set_time_now (tcp_get_worker (thread_index));
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
/* ACK for for a SYN-ACK -> tcp-rcv-process. */
_(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
_(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
_(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
_(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
Code Review / vpp.git / blobdiff