/* All TCP nodes have the same outgoing arcs */
#define foreach_tcp_state_next \
- _ (DROP, "error-drop") \
+ _ (DROP4, "ip4-drop") \
+ _ (DROP6, "ip6-drop") \
_ (TCP4_OUTPUT, "tcp4-output") \
_ (TCP6_OUTPUT, "tcp6-output")
#define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \
: TCP_NEXT_TCP6_OUTPUT)
+#define tcp_next_drop(is_ip4) (is_ip4 ? TCP_NEXT_DROP4 \
+ : TCP_NEXT_DROP6)
+
vlib_node_registration_t tcp4_established_node;
vlib_node_registration_t tcp6_established_node;
* or the rcv_nxt at last ack sent instead of rcv_nxt since that's the
* peer's reference when computing our receive window.
*
- * This accepts only segments within the window.
+ * This:
+ * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las)
+ * however, is too strict when we have retransmits. Instead we just check that
+ * the seq is not beyond the right edge and that the end of the segment is not
+ * less than the left edge.
+ *
+ * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so
+ * use rcv_nxt in the right edge window test instead of rcv_las.
+ *
*/
always_inline u8
tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq)
{
- return seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd)
- && seq_geq (seq, tc->rcv_nxt);
+ return (seq_geq (end_seq, tc->rcv_las)
+ && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd));
}
-void
+/**
+ * Parse TCP header options.
+ *
+ * @param th TCP header
+ * @param to TCP options data structure to be populated
+ * @return -1 if parsing failed
+ */
+static int
tcp_options_parse (tcp_header_t * th, tcp_options_t * to)
{
const u8 *data;
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)
{
if (kind == TCP_OPTION_EOL)
break;
else if (kind == TCP_OPTION_NOOP)
- opt_len = 1;
+ {
+ opt_len = 1;
+ continue;
+ }
else
{
/* broken options */
if (opts_len < 2)
- break;
+ return -1;
opt_len = data[1];
/* weird option length */
if (opt_len < 2 || opt_len > opts_len)
- break;
+ return -1;
}
/* Parse options */
vec_reset_length (to->sacks);
for (j = 0; j < to->n_sack_blocks; j++)
{
- b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 4 * j));
- b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 4 * j));
+ b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j));
+ b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j));
vec_add1 (to->sacks, b);
}
break;
continue;
}
}
+ return 0;
}
+/**
+ * RFC1323: Check against wrapped sequence numbers (PAWS). If we have
+ * timestamp to echo and it's less than tsval_recent, drop segment
+ * but still send an ACK in order to retain TCP's mechanism for detecting
+ * and recovering from half-open connections
+ *
+ * Or at least that's what the theory says. It seems that this might not work
+ * very well with packet reordering and fast retransmit. XXX
+ */
always_inline int
tcp_segment_check_paws (tcp_connection_t * tc)
{
- /* XXX normally test for timestamp should be lt instead of leq, but for
- * local testing this is not enough */
- return tcp_opts_tstamp (&tc->opt) && tc->tsval_recent
- && timestamp_lt (tc->opt.tsval, tc->tsval_recent);
+ return tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent
+ && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent);
+}
+
+/**
+ * Update tsval recent
+ */
+always_inline void
+tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end)
+{
+ /*
+ * RFC1323: If Last.ACK.sent falls within the range of sequence numbers
+ * of an incoming segment:
+ * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN
+ * then the TSval from the segment is copied to TS.Recent;
+ * otherwise, the TSval is ignored.
+ */
+ if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las)
+ && seq_leq (tc->rcv_las, seq_end))
+ {
+ ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval));
+ tc->tsval_recent = tc->rcv_opts.tsval;
+ 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)
+tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
+ vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0)
{
- u8 paws_failed;
+ /* 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 error;
+ }
if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0)))
- return -1;
+ {
+ *error0 = TCP_ERROR_SEGMENT_INVALID;
+ goto error;
+ }
- tcp_options_parse (th0, &tc0->opt);
+ if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts)))
+ {
+ clib_warning ("options parse error");
+ *error0 = TCP_ERROR_OPTIONS;
+ goto error;
+ }
- /* RFC1323: Check against wrapped sequence numbers (PAWS). If we have
- * timestamp to echo and it's less than tsval_recent, drop segment
- * but still send an ACK in order to retain TCP's mechanism for detecting
- * and recovering from half-open connections */
- paws_failed = tcp_segment_check_paws (tc0);
- if (paws_failed)
+ if (PREDICT_FALSE (tcp_segment_check_paws (tc0)))
{
- clib_warning ("paws failed");
+ *error0 = TCP_ERROR_PAWS;
+ if (CLIB_DEBUG > 2)
+ clib_warning ("paws failed\n%U", format_tcp_connection, tc0, 2);
+ TCP_EVT_DBG (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number,
+ vnet_buffer (b0)->tcp.seq_end);
/* 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;
+ clib_warning ("paws failed - really old segment. REALLY?");
}
else
{
/* Drop after ack if not rst */
if (!tcp_rst (th0))
{
- tcp_make_ack (tc0, b0);
- *next0 = tcp_next_output (tc0->c_is_ip4);
- return -1;
+ tcp_program_ack (wrk, tc0);
+ TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
}
}
+ goto error;
}
/* 1st: check sequence number */
if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number,
vnet_buffer (b0)->tcp.seq_end))
{
- if (!tcp_rst (th0))
+ *error0 = TCP_ERROR_RCV_WND;
+ /* If our window is 0 and the packet is in sequence, let it pass
+ * through for ack processing. It should be dropped later. */
+ if (!(tc0->rcv_wnd == 0
+ && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number))
{
- /* Send dup ack */
- tcp_make_ack (tc0, b0);
- *next0 = tcp_next_output (tc0->c_is_ip4);
+ /* If not RST, send dup ack */
+ if (!tcp_rst (th0))
+ {
+ tcp_program_dupack (wrk, tc0);
+ TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
+ }
+ goto error;
}
- return -1;
}
/* 2nd: check the RST bit */
- if (tcp_rst (th0))
+ if (PREDICT_FALSE (tcp_rst (th0)))
{
tcp_connection_reset (tc0);
- return -1;
+ *error0 = TCP_ERROR_RST_RCVD;
+ goto error;
}
/* 3rd: check security and precedence (skip) */
/* 4th: check the SYN bit */
- if (tcp_syn (th0))
- {
- tcp_send_reset (b0, tc0->c_is_ip4);
- return -1;
- }
-
- /* If PAWS passed and segment in window, save timestamp */
- if (!paws_failed)
+ if (PREDICT_FALSE (tcp_syn (th0)))
{
- tc0->tsval_recent = tc0->opt.tsval;
- tc0->tsval_recent_age = tcp_time_now ();
+ /* TODO implement RFC 5961 */
+ if (tc0->state == TCP_STATE_SYN_RCVD)
+ {
+ tcp_send_synack (tc0);
+ TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0);
+ }
+ else
+ {
+ tcp_program_ack (wrk, tc0);
+ TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0);
+ }
+ goto error;
}
+ /* If segment in window, save timestamp */
+ tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number,
+ vnet_buffer (b0)->tcp.seq_end);
return 0;
+
+error:
+ return -1;
}
always_inline int
static void
tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt)
{
- int err;
+ int err, diff;
if (tc->srtt != 0)
{
err = mrtt - tc->srtt;
- tc->srtt += err >> 3;
/* XXX Drop in RTT results in RTTVAR increase and bigger RTO.
* The increase should be bound */
- tc->rttvar += (clib_abs (err) - tc->rttvar) >> 2;
+ tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1);
+ diff = (clib_abs (err) - (int) tc->rttvar) >> 2;
+ tc->rttvar = clib_max ((int) tc->rttvar + diff, 1);
}
else
{
/* First measurement. */
tc->srtt = mrtt;
- tc->rttvar = mrtt << 1;
+ tc->rttvar = mrtt >> 1;
}
}
-/** Update RTT estimate and RTO timer
+void
+tcp_update_rto (tcp_connection_t * tc)
+{
+ tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX);
+ tc->rto = clib_max (tc->rto, TCP_RTO_MIN);
+}
+
+/**
+ * Update RTT estimate and RTO timer
*
* Measure RTT: We have two sources of RTT measurements: TSOPT and ACK
* timing. Middle boxes are known to fiddle with TCP options so we
* should give higher priority to ACK timing.
*
+ * This should be called only if previously sent bytes have been acked.
+ *
* return 1 if valid rtt 0 otherwise
*/
static int
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
- if (tc->rtt_seq && seq_gt (ack, tc->rtt_seq) && !tc->rto_boff)
+ if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)
{
- mrtt = tcp_time_now () - tc->rtt_ts;
- tc->rtt_seq = 0;
+ if (tcp_in_recovery (tc))
+ return 0;
+ goto done;
}
+ if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
+ {
+ 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). Note: last condition could be dropped, we don't
- * try to update rtt for dupacks */
- else if (tcp_opts_tstamp (&tc->opt) && tc->opt.tsecr && tc->bytes_acked)
+ * 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->opt.tsecr;
+ u32 now = tcp_time_now_w_thread (tc->c_thread_index);
+ mrtt = clib_max (now - tc->rcv_opts.tsecr, 1);
}
/* Ignore dubious measurements */
if (mrtt == 0 || mrtt > TCP_RTT_MAX)
- return 0;
+ goto done;
tcp_estimate_rtt (tc, mrtt);
- tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX);
+done:
- return 1;
+ /* Allow measuring of a new RTT */
+ tc->rtt_ts = 0;
+
+ /* If we got here something must've been ACKed so make sure boff is 0,
+ * even if mrtt is not valid since we update the rto lower */
+ tc->rto_boff = 0;
+ tcp_update_rto (tc);
+
+ return 0;
}
/**
- * 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 bytes */
- stream_session_dequeue_drop (&tc->connection, tc->bytes_acked);
+ u32 thread_index = wrk->vm->thread_index;
+ u32 *pending_deq_acked;
+ tcp_connection_t *tc;
+ int i;
- /* Update rtt and rto */
- if (tcp_update_rtt (tc, ack))
+ if (!vec_len (wrk->pending_deq_acked))
+ return;
+
+ pending_deq_acked = wrk->pending_deq_acked;
+ for (i = 0; i < vec_len (pending_deq_acked); i++)
{
- /* Good ACK received and valid RTT, make sure retransmit backoff is 0 */
- tc->rto_boff = 0;
+ tc = tcp_connection_get (pending_deq_acked[i], thread_index);
+ tc->flags &= ~TCP_CONN_DEQ_PENDING;
+
+ /* 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;
}
-/** Check if dupack as per RFC5681 Sec. 2 */
-always_inline u8
-tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 new_snd_wnd)
+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;
+}
+
+/**
+ * Check if duplicate ack as per RFC5681 Sec. 2
+ */
+static u8
+tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd,
+ u32 prev_snd_una)
{
- return ((vnet_buffer (b)->tcp.ack_number == tc->snd_una)
+ return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una)
&& seq_gt (tc->snd_una_max, tc->snd_una)
&& (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
- && (new_snd_wnd == tc->snd_wnd));
+ && (prev_snd_wnd == tc->snd_wnd));
}
-void
+/**
+ * Checks if ack is a congestion control event.
+ */
+static u8
+tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b,
+ u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack)
+{
+ /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are
+ * defined to be 'duplicate' */
+ *is_dack = tc->sack_sb.last_sacked_bytes
+ || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una);
+
+ return ((*is_dack || tcp_in_cong_recovery (tc)) && !tcp_is_lost_fin (tc));
+}
+
+static u32
+scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes));
+ return hole - sb->holes;
+}
+
+static u32
+scoreboard_hole_bytes (sack_scoreboard_hole_t * hole)
+{
+ return hole->end - hole->start;
+}
+
+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;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
+{
+ if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, hole->next);
+ return 0;
+}
+
+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;
+}
+
+sack_scoreboard_hole_t *
+scoreboard_first_hole (sack_scoreboard_t * sb)
+{
+ if (sb->head != TCP_INVALID_SACK_HOLE_INDEX)
+ return pool_elt_at_index (sb->holes, sb->head);
+ return 0;
+}
+
+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;
+}
+
+static void
scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole)
{
sack_scoreboard_hole_t *next, *prev;
next = pool_elt_at_index (sb->holes, hole->next);
next->prev = hole->prev;
}
+ else
+ {
+ sb->tail = hole->prev;
+ }
if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX)
{
sb->head = hole->next;
}
+ if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole)
+ sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
+
+ /* Poison the entry */
+ if (CLIB_DEBUG > 0)
+ clib_memset (hole, 0xfe, sizeof (*hole));
+
pool_put (sb->holes, hole);
}
-sack_scoreboard_hole_t *
-scoreboard_insert_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * prev,
+static sack_scoreboard_hole_t *
+scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index,
u32 start, u32 end)
{
- sack_scoreboard_hole_t *hole, *next;
+ sack_scoreboard_hole_t *hole, *next, *prev;
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;
- hole_index = hole - sb->holes;
+ hole_index = scoreboard_hole_index (sb, hole);
+ prev = scoreboard_get_hole (sb, prev_index);
if (prev)
{
- hole->prev = prev - sb->holes;
+ hole->prev = prev_index;
hole->next = prev->next;
if ((next = scoreboard_next_hole (sb, hole)))
next->prev = hole_index;
+ else
+ sb->tail = hole_index;
prev->next = hole_index;
}
}
static void
+scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb)
+{
+ sack_scoreboard_hole_t *left, *right;
+ u32 bytes = 0, blks = 0;
+
+ sb->lost_bytes = 0;
+ sb->sacked_bytes = 0;
+ left = scoreboard_last_hole (sb);
+ if (!left)
+ return;
+
+ if (seq_gt (sb->high_sacked, left->end))
+ {
+ bytes = sb->high_sacked - left->end;
+ blks = 1;
+ }
+
+ 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 += right->start - left->end;
+ blks++;
+ }
+
+ /* left is first lost */
+ if (left)
+ {
+ 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;
+}
+
+/**
+ * Figure out the next hole to retransmit
+ *
+ * Follows logic proposed in RFC6675 Sec. 4, NextSeg()
+ */
+sack_scoreboard_hole_t *
+scoreboard_next_rxt_hole (sack_scoreboard_t * sb,
+ sack_scoreboard_hole_t * start,
+ u8 have_unsent, u8 * can_rescue, u8 * snd_limited)
+{
+ sack_scoreboard_hole_t *hole = 0;
+
+ hole = start ? start : scoreboard_first_hole (sb);
+ while (hole && seq_leq (hole->end, sb->high_rxt) && hole->is_lost)
+ hole = scoreboard_next_hole (sb, hole);
+
+ /* Nothing, return */
+ if (!hole)
+ {
+ sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
+ return 0;
+ }
+
+ /* Rule (1): if higher than rxt, less than high_sacked and lost */
+ if (hole->is_lost && seq_lt (hole->start, sb->high_sacked))
+ {
+ sb->cur_rxt_hole = scoreboard_hole_index (sb, hole);
+ }
+ else
+ {
+ /* Rule (2): available unsent data */
+ if (have_unsent)
+ {
+ 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 = 0;
+ sb->cur_rxt_hole = scoreboard_hole_index (sb, hole);
+ }
+ /* Rule (4): if hole beyond high_sacked */
+ else
+ {
+ ASSERT (seq_geq (hole->start, sb->high_sacked));
+ *snd_limited = 1;
+ *can_rescue = 1;
+ /* HighRxt MUST NOT be updated */
+ return 0;
+ }
+ }
+
+ if (hole && seq_lt (sb->high_rxt, hole->start))
+ sb->high_rxt = hole->start;
+
+ return hole;
+}
+
+static void
+scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 snd_una)
+{
+ sack_scoreboard_hole_t *hole;
+ hole = scoreboard_first_hole (sb);
+ if (hole)
+ {
+ snd_una = seq_gt (snd_una, hole->start) ? snd_una : hole->start;
+ sb->cur_rxt_hole = sb->head;
+ }
+ sb->high_rxt = snd_una;
+ sb->rescue_rxt = snd_una - 1;
+}
+
+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
+scoreboard_clear (sack_scoreboard_t * 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);
+ ASSERT (pool_elts (sb->holes) == 0);
+ 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;
+}
+
+/**
+ * Test that scoreboard is sane after recovery
+ *
+ * Returns 1 if scoreboard is empty or if first hole beyond
+ * snd_una.
+ */
+static u8
+tcp_scoreboard_is_sane_post_recovery (tcp_connection_t * tc)
+{
+ sack_scoreboard_hole_t *hole;
+ hole = scoreboard_first_hole (&tc->sack_sb);
+ return (!hole || (seq_geq (hole->start, tc->snd_una)
+ && seq_lt (hole->end, tc->snd_una_max)));
+}
+
+void
tcp_rcv_sacks (tcp_connection_t * tc, u32 ack)
{
sack_scoreboard_t *sb = &tc->sack_sb;
sack_block_t *blk, tmp;
- sack_scoreboard_hole_t *hole, *next_hole;
- u32 blk_index = 0;
+ sack_scoreboard_hole_t *hole, *next_hole, *last_hole;
+ u32 blk_index = 0, old_sacked_bytes, hole_index;
int i, j;
- if (!tcp_opts_sack (tc) && sb->head == TCP_INVALID_SACK_HOLE_INDEX)
+ sb->last_sacked_bytes = 0;
+ sb->last_bytes_delivered = 0;
+ sb->snd_una_adv = 0;
+
+ if (!tcp_opts_sack (&tc->rcv_opts)
+ && sb->head == TCP_INVALID_SACK_HOLE_INDEX)
return;
- /* Remove invalid blocks */
- vec_foreach (blk, tc->opt.sacks)
- {
- if (seq_lt (blk->start, blk->end)
- && seq_gt (blk->start, tc->snd_una)
- && seq_gt (blk->start, ack) && seq_lt (blk->end, tc->snd_nxt))
- continue;
+ old_sacked_bytes = sb->sacked_bytes;
- vec_del1 (tc->opt.sacks, blk - tc->opt.sacks);
- }
+ /* Remove invalid blocks */
+ blk = tc->rcv_opts.sacks;
+ while (blk < vec_end (tc->rcv_opts.sacks))
+ {
+ if (seq_lt (blk->start, blk->end)
+ && seq_gt (blk->start, tc->snd_una)
+ && seq_gt (blk->start, ack) && seq_leq (blk->end, tc->snd_una_max))
+ {
+ blk++;
+ continue;
+ }
+ vec_del1 (tc->rcv_opts.sacks, blk - tc->rcv_opts.sacks);
+ }
/* Add block for cumulative ack */
if (seq_gt (ack, tc->snd_una))
{
tmp.start = tc->snd_una;
tmp.end = ack;
- vec_add1 (tc->opt.sacks, tmp);
+ vec_add1 (tc->rcv_opts.sacks, tmp);
}
- if (vec_len (tc->opt.sacks) == 0)
+ if (vec_len (tc->rcv_opts.sacks) == 0)
return;
+ tcp_scoreboard_trace_add (tc, ack);
+
/* Make sure blocks are ordered */
- for (i = 0; i < vec_len (tc->opt.sacks); i++)
- for (j = i; j < vec_len (tc->opt.sacks); j++)
- if (seq_lt (tc->opt.sacks[j].start, tc->opt.sacks[i].start))
+ for (i = 0; i < vec_len (tc->rcv_opts.sacks); i++)
+ for (j = i + 1; j < vec_len (tc->rcv_opts.sacks); j++)
+ if (seq_lt (tc->rcv_opts.sacks[j].start, tc->rcv_opts.sacks[i].start))
{
- tmp = tc->opt.sacks[i];
- tc->opt.sacks[i] = tc->opt.sacks[j];
- tc->opt.sacks[j] = tmp;
+ tmp = tc->rcv_opts.sacks[i];
+ tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j];
+ tc->rcv_opts.sacks[j] = tmp;
}
- /* If no holes, insert the first that covers all outstanding bytes */
if (sb->head == TCP_INVALID_SACK_HOLE_INDEX)
{
- scoreboard_insert_hole (sb, 0, tc->snd_una, tc->snd_una_max);
+ /* If no holes, insert the first that covers all outstanding bytes */
+ last_hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX,
+ tc->snd_una, tc->snd_una_max);
+ sb->tail = scoreboard_hole_index (sb, last_hole);
+ tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1];
+ sb->high_sacked = tmp.end;
+ }
+ else
+ {
+ /* If we have holes but snd_una_max is beyond the last hole, update
+ * last hole end */
+ tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1];
+ last_hole = scoreboard_last_hole (sb);
+ if (seq_gt (tc->snd_una_max, last_hole->end))
+ {
+ if (seq_geq (last_hole->start, sb->high_sacked))
+ {
+ last_hole->end = tc->snd_una_max;
+ }
+ /* New hole after high sacked block */
+ else if (seq_lt (sb->high_sacked, tc->snd_una_max))
+ {
+ scoreboard_insert_hole (sb, sb->tail, sb->high_sacked,
+ tc->snd_una_max);
+ }
+ }
+ /* Keep track of max byte sacked for when the last hole
+ * is acked */
+ if (seq_gt (tmp.end, sb->high_sacked))
+ sb->high_sacked = tmp.end;
}
/* Walk the holes with the SACK blocks */
hole = pool_elt_at_index (sb->holes, sb->head);
- while (hole && blk_index < vec_len (tc->opt.sacks))
+ while (hole && blk_index < vec_len (tc->rcv_opts.sacks))
{
- blk = &tc->opt.sacks[blk_index];
-
+ blk = &tc->rcv_opts.sacks[blk_index];
if (seq_leq (blk->start, hole->start))
{
/* Block covers hole. Remove hole */
{
next_hole = scoreboard_next_hole (sb, hole);
- /* Byte accounting */
- if (seq_lt (hole->end, ack))
+ /* Byte accounting: snd_una needs to be advanced */
+ if (blk->end == ack)
{
- /* Bytes lost because snd wnd left edge advances */
- if (seq_lt (next_hole->start, ack))
- sb->sacked_bytes -= next_hole->start - hole->end;
+ if (next_hole)
+ {
+ if (seq_lt (ack, next_hole->start))
+ sb->snd_una_adv = next_hole->start - ack;
+ sb->last_bytes_delivered +=
+ next_hole->start - hole->end;
+ }
else
- sb->sacked_bytes -= ack - hole->end;
- }
- else
- {
- sb->sacked_bytes += scoreboard_hole_bytes (hole);
+ {
+ ASSERT (seq_geq (sb->high_sacked, ack));
+ sb->snd_una_adv = sb->high_sacked - ack;
+ sb->last_bytes_delivered += sb->high_sacked - hole->end;
+ }
}
scoreboard_remove_hole (sb, hole);
hole = next_hole;
}
- /* Partial overlap */
+ /* Partial 'head' overlap */
else
{
- sb->sacked_bytes += blk->end - hole->start;
- hole->start = blk->end;
+ if (seq_gt (blk->end, hole->start))
+ {
+ hole->start = blk->end;
+ }
blk_index++;
}
}
else
{
/* Hole must be split */
- if (seq_leq (blk->end, hole->end))
+ if (seq_lt (blk->end, hole->end))
{
- sb->sacked_bytes += blk->end - blk->start;
- scoreboard_insert_hole (sb, hole, blk->end, hole->end);
- hole->end = blk->start - 1;
+ hole_index = scoreboard_hole_index (sb, hole);
+ next_hole = scoreboard_insert_hole (sb, hole_index, blk->end,
+ hole->end);
+
+ /* Pool might've moved */
+ hole = scoreboard_get_hole (sb, hole_index);
+ hole->end = blk->start;
blk_index++;
+ ASSERT (hole->next == scoreboard_hole_index (sb, next_hole));
}
- else
+ else if (seq_lt (blk->start, hole->end))
{
- sb->sacked_bytes += hole->end - blk->start + 1;
- hole->end = blk->start - 1;
- hole = scoreboard_next_hole (sb, hole);
+ hole->end = blk->start;
}
+ hole = scoreboard_next_hole (sb, hole);
}
}
+
+ 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 || 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) || 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);
}
-/** Update snd_wnd
+/**
+ * Try to update snd_wnd based on feedback received from peer.
*
- * If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set
- * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */
+ * If successful, and new window is 'effectively' 0, activate persist
+ * timer.
+ */
static void
tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd)
{
- if (tc->snd_wl1 < seq || (tc->snd_wl1 == seq && tc->snd_wl2 <= ack))
+ /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set
+ * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */
+ if (seq_lt (tc->snd_wl1, seq)
+ || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack)))
{
tc->snd_wnd = snd_wnd;
tc->snd_wl1 = seq;
tc->snd_wl2 = ack;
+ TCP_EVT_DBG (TCP_EVT_SND_WND, tc);
+
+ 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)
+ && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))
+ tcp_persist_timer_set (tc);
+ }
+ else
+ {
+ tcp_persist_timer_reset (tc);
+ if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
+ {
+ tc->rto_boff = 0;
+ tcp_update_rto (tc);
+ }
+ }
}
}
-static void
-tcp_cc_congestion (tcp_connection_t * tc)
+/**
+ * Init loss recovery/fast recovery.
+ *
+ * Triggered by dup acks as opposed to timer timeout. Note that cwnd is
+ * updated in @ref tcp_cc_handle_event after fast retransmit
+ */
+void
+tcp_cc_init_congestion (tcp_connection_t * 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);
}
static void
-tcp_cc_recover (tcp_connection_t * tc)
+tcp_cc_recovery_exit (tcp_connection_t * tc)
{
- if (tcp_in_fastrecovery (tc))
- {
- tc->cc_algo->recovered (tc);
- tcp_recovery_off (tc);
- }
- else if (tcp_in_recovery (tc))
- {
- tcp_recovery_off (tc);
- tc->cwnd = tcp_loss_wnd (tc);
- }
+ tc->rto_boff = 0;
+ tcp_update_rto (tc);
+ tc->snd_rxt_ts = 0;
+ tc->snd_nxt = tc->snd_una_max;
+ tcp_recovery_off (tc);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
}
-static void
-tcp_cc_rcv_ack (tcp_connection_t * tc)
+void
+tcp_cc_fastrecovery_exit (tcp_connection_t * tc)
{
- u8 partial_ack;
+ tc->cc_algo->recovered (tc);
+ tc->snd_rxt_bytes = 0;
+ tc->rcv_dupacks = 0;
+ tc->snd_nxt = tc->snd_una_max;
+ tc->snd_rxt_bytes = 0;
- if (tcp_in_recovery (tc))
- {
- partial_ack = seq_lt (tc->snd_una, tc->snd_una_max);
- if (!partial_ack)
- {
- /* Clear retransmitted bytes. */
- tc->rtx_bytes = 0;
- tcp_cc_recover (tc);
- }
- else
- {
- /* Clear retransmitted bytes. XXX should we clear all? */
- tc->rtx_bytes = 0;
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK);
+ tcp_fastrecovery_off (tc);
+ tcp_fastrecovery_1_smss_off (tc);
+ tcp_fastrecovery_first_off (tc);
- /* Retransmit first unacked segment */
- tcp_retransmit_first_unacked (tc);
- }
- }
- else
- {
- tc->cc_algo->rcv_ack (tc);
- }
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
+}
+static void
+tcp_cc_congestion_undo (tcp_connection_t * tc)
+{
+ tc->cwnd = tc->prev_cwnd;
+ tc->ssthresh = tc->prev_ssthresh;
+ tc->snd_nxt = tc->snd_una_max;
tc->rcv_dupacks = 0;
- tc->tsecr_last_ack = tc->opt.tsecr;
+ 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);
+}
+
+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
+ && tcp_opts_tstamp (&tc->rcv_opts)
+ && 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));
+ if (tcp_cc_is_spurious_retransmit (tc))
+ {
+ tcp_cc_congestion_undo (tc);
+ return 1;
+ }
+
+ 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);
+ ASSERT (!tcp_in_cong_recovery (tc));
+ ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
+ return 0;
+}
+
+static void
+tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b)
+{
+ ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
+
+ /* Congestion avoidance */
+ tcp_cc_rcv_ack (tc);
+
+ /* If a cumulative ack, make sure dupacks is 0 */
+ tc->rcv_dupacks = 0;
+
+ /* When dupacks hits the threshold we only enter fast retransmit if
+ * cumulative ack covers more than snd_congestion. Should snd_una
+ * wrap this test may fail under otherwise valid circumstances.
+ * Therefore, proactively update snd_congestion when wrap detected. */
+ if (PREDICT_FALSE
+ (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked)
+ && seq_gt (tc->snd_congestion, tc->snd_una)))
+ tc->snd_congestion = tc->snd_una - 1;
+}
+
+static u8
+tcp_should_fastrecover_sack (tcp_connection_t * tc)
+{
+ return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes;
+}
+
+static u8
+tcp_should_fastrecover (tcp_connection_t * tc)
+{
+ return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD
+ || 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
+ */
static void
-tcp_cc_rcv_dupack (tcp_connection_t * tc, u32 ack)
+tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
{
- ASSERT (tc->snd_una == ack);
+ u32 rxt_delivered;
- tc->rcv_dupacks++;
- if (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
+ if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts))
{
- /* RFC6582 NewReno heuristic to avoid multiple fast retransmits */
- if (tc->opt.tsecr != tc->tsecr_last_ack)
+ if (tc->bytes_acked)
+ goto partial_ack;
+ tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc);
+ return;
+ }
+ /*
+ * Duplicate ACK. Check if we should enter fast recovery, or if already in
+ * it account for the bytes that left the network.
+ */
+ else if (is_dack && !tcp_in_recovery (tc))
+ {
+ TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1);
+ ASSERT (tc->snd_una != tc->snd_una_max
+ || tc->sack_sb.last_sacked_bytes);
+
+ tc->rcv_dupacks++;
+
+ /* Pure duplicate ack. If some data got acked, it's handled lower */
+ if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked)
+ {
+ ASSERT (tcp_in_fastrecovery (tc));
+ tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
+ return;
+ }
+ else if (tcp_should_fastrecover (tc))
+ {
+ u32 pacer_wnd;
+
+ ASSERT (!tcp_in_fastrecovery (tc));
+
+ /* 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);
+
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ {
+ tc->cwnd = tc->ssthresh;
+ scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una);
+ }
+ else
+ {
+ /* 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
+ || (tc->bytes_acked && !tcp_in_cong_recovery (tc)))
+ {
+ tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
+ return;
+ }
+ 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;
}
+ }
- tcp_fastrecovery_on (tc);
+ if (!tc->bytes_acked)
+ return;
+
+partial_ack:
+ TCP_EVT_DBG (TCP_EVT_CC_PACK, tc);
- /* Handle congestion and dupack */
- tcp_cc_congestion (tc);
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
+ /*
+ * Legitimate ACK. 1) See if we can exit recovery
+ */
- tcp_fast_retransmit (tc);
+ if (seq_geq (tc->snd_una, tc->snd_congestion))
+ {
+ tcp_retransmit_timer_update (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 */
- tc->cwnd = tc->ssthresh + TCP_DUPACK_THRESHOLD * tc->snd_mss;
+ /* If spurious return, we've already updated everything */
+ if (tcp_cc_recover (tc))
+ {
+ tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ return;
+ }
+
+ tc->snd_nxt = tc->snd_una_max;
+
+ /* Treat as congestion avoidance ack */
+ tcp_cc_rcv_ack (tc);
+ return;
}
- else if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD)
+
+ /*
+ * 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))
+ {
+ tcp_cc_rcv_ack (tc);
+ transport_add_tx_event (&tc->connection);
+ return;
+ }
+
+ /* Remove retransmitted bytes that have been delivered */
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
- ASSERT (tcp_in_fastrecovery (tc));
+ ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv
+ >= tc->sack_sb.last_bytes_delivered
+ || (tc->flags & TCP_CONN_FINSNT));
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
+ /* If we have sacks and we haven't gotten an ack beyond high_rxt,
+ * remove sacked bytes 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
+ {
+ 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;
}
-}
-void
-tcp_cc_init (tcp_connection_t * tc)
-{
- tc->cc_algo = tcp_cc_algo_get (TCP_CC_NEWRENO);
- tc->cc_algo->init (tc);
+ tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK);
+
+ /*
+ * Since this was a partial ack, try to retransmit some more data
+ */
+ 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 new_snd_wnd;
+ u32 prev_snd_wnd, prev_snd_una;
+ u8 is_dack;
+
+ TCP_EVT_DBG (TCP_EVT_CC_STAT, tc);
- /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) then send an
- * ACK, drop the segment, and return */
- if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt))
+ /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */
+ if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
{
- tcp_make_ack (tc, b);
- *next = tcp_next_output (tc->c_is_ip4);
- *error = TCP_ERROR_ACK_INVALID;
- return -1;
+ /* When we entered recovery, we reset snd_nxt to snd_una. Seems peer
+ * still has the data so accept the ack */
+ if (tcp_in_recovery (tc)
+ && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_congestion))
+ {
+ tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
+ if (seq_gt (tc->snd_nxt, tc->snd_una_max))
+ tc->snd_una_max = tc->snd_nxt;
+ goto process_ack;
+ }
+
+ /* If we have outstanding data and this is within the window, accept it,
+ * probably retransmit has timed out. Otherwise ACK segment and then
+ * drop it */
+ if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max))
+ {
+ 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;
+ }
+
+ TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 2,
+ vnet_buffer (b)->tcp.ack_number);
+
+ tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
}
- /* If old ACK, discard */
- if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
+ /* If old ACK, probably it's an old dupack */
+ if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)))
{
*error = TCP_ERROR_ACK_OLD;
- return -1;
+ TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 1,
+ vnet_buffer (b)->tcp.ack_number);
+ if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
+ tcp_cc_handle_event (tc, 1);
+ /* Don't drop yet */
+ return 0;
}
- if (tcp_opts_sack_permitted (&tc->opt))
+ /*
+ * Looks okay, process feedback
+ */
+process_ack:
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
- new_snd_wnd = clib_net_to_host_u16 (th->window) << tc->snd_wscale;
+ prev_snd_wnd = tc->snd_wnd;
+ prev_snd_una = tc->snd_una;
+ tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number,
+ vnet_buffer (b)->tcp.ack_number,
+ clib_net_to_host_u16 (th->window) << tc->snd_wscale);
+ tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
+ tc->snd_una = vnet_buffer (b)->tcp.ack_number + tc->sack_sb.snd_una_adv;
+ tcp_validate_txf_size (tc, tc->bytes_acked);
- if (tcp_ack_is_dupack (tc, b, new_snd_wnd))
+ if (tc->bytes_acked)
{
- tcp_cc_rcv_dupack (tc, vnet_buffer (b)->tcp.ack_number);
- *error = TCP_ERROR_ACK_DUP;
- return -1;
+ tcp_program_dequeue (wrk, tc);
+ tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number);
}
- /* Valid ACK */
- tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
- tc->snd_una = vnet_buffer (b)->tcp.ack_number;
-
- /* Dequeue ACKed packet and update RTT */
- tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number);
-
- tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number,
- vnet_buffer (b)->tcp.ack_number, new_snd_wnd);
-
- /* Updates congestion control (slow start/congestion avoidance) */
- tcp_cc_rcv_ack (tc);
-
TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc);
- /* If everything has been acked, stop retransmit timer
- * otherwise update */
- if (tc->snd_una == tc->snd_una_max)
- tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
- else
- tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, tc->rto);
+ /*
+ * Check if we have congestion event
+ */
+ if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack))
+ {
+ tcp_cc_handle_event (tc, is_dack);
+ if (!tcp_in_cong_recovery (tc))
+ return 0;
+ *error = TCP_ERROR_ACK_DUP;
+ if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
+ return 0;
+ return -1;
+ }
+
+ /*
+ * Update congestion control (slow start/congestion avoidance)
+ */
+ tcp_cc_update (tc, b);
+ *error = TCP_ERROR_ACK_OK;
return 0;
}
+static u8
+tcp_sack_vector_is_sane (sack_block_t * sacks)
+{
+ int i;
+ for (i = 1; i < vec_len (sacks); i++)
+ {
+ if (sacks[i - 1].end == sacks[i].start)
+ return 0;
+ }
+ return 1;
+}
+
/**
* Build SACK list as per RFC2018.
*
* @param start Start sequence number of the newest SACK block
* @param end End sequence of the newest SACK block
*/
-static void
+void
tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end)
{
- sack_block_t *new_list = 0, block;
- u32 n_elts;
+ sack_block_t *new_list = 0, *block = 0;
int i;
- u8 new_head = 0;
/* If the first segment is ooo add it to the list. Last write might've moved
* rcv_nxt over the first segment. */
if (seq_lt (tc->rcv_nxt, start))
{
- block.start = start;
- block.end = end;
- vec_add1 (new_list, block);
- new_head = 1;
+ vec_add2 (new_list, block, 1);
+ block->start = start;
+ block->end = end;
}
/* Find the blocks still worth keeping. */
for (i = 0; i < vec_len (tc->snd_sacks); i++)
{
- /* Discard if:
- * 1) rcv_nxt advanced beyond current block OR
- * 2) Segment overlapped by the first segment, i.e., it has been merged
- * into it.*/
- if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)
- || seq_leq (tc->snd_sacks[i].start, end))
+ /* Discard if rcv_nxt advanced beyond current block */
+ if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt))
continue;
- /* Save subsequent segments to new SACK list. */
- n_elts = clib_min (vec_len (tc->snd_sacks) - i,
- TCP_MAX_SACK_BLOCKS - new_head);
- vec_insert_elts (new_list, &tc->snd_sacks[i], n_elts, new_head);
- break;
+ /* Merge or drop if segment overlapped by the new segment */
+ if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start)
+ && seq_leq (tc->snd_sacks[i].start, new_list[0].end)))
+ {
+ if (seq_lt (tc->snd_sacks[i].start, new_list[0].start))
+ new_list[0].start = tc->snd_sacks[i].start;
+ if (seq_lt (new_list[0].end, tc->snd_sacks[i].end))
+ new_list[0].end = tc->snd_sacks[i].end;
+ continue;
+ }
+
+ /* Save to new SACK list if we have space. */
+ if (vec_len (new_list) < TCP_MAX_SACK_BLOCKS)
+ {
+ vec_add1 (new_list, tc->snd_sacks[i]);
+ }
+ else
+ {
+ clib_warning ("sack discarded");
+ }
}
+ ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS);
+
/* Replace old vector with new one */
vec_free (tc->snd_sacks);
tc->snd_sacks = new_list;
+
+ /* Segments should not 'touch' */
+ ASSERT (tcp_sack_vector_is_sane (tc->snd_sacks));
+}
+
+u32
+tcp_sack_list_bytes (tcp_connection_t * tc)
+{
+ u32 bytes = 0, i;
+ for (i = 0; i < vec_len (tc->snd_sacks); i++)
+ bytes += tc->snd_sacks[i].end - tc->snd_sacks[i].start;
+ return bytes;
}
/** Enqueue data for delivery to application */
-always_inline u32
+static int
tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
u16 data_len)
{
- int written;
+ int written, error = TCP_ERROR_ENQUEUED;
- /* Pure ACK. Update rcv_nxt and be done. */
- if (PREDICT_FALSE (data_len == 0))
- {
- tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end;
- return TCP_ERROR_PURE_ACK;
- }
+ ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
+ ASSERT (data_len);
+ written = session_enqueue_stream_connection (&tc->connection, b, 0,
+ 1 /* queue event */ , 1);
- written = stream_session_enqueue_data (&tc->connection,
- vlib_buffer_get_current (b),
- data_len, 1 /* queue event */ );
+ TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written);
/* Update rcv_nxt */
if (PREDICT_TRUE (written == data_len))
{
- tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end;
+ tc->rcv_nxt += written;
}
/* If more data written than expected, account for out-of-order bytes. */
else if (written > data_len)
{
- tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end + written - data_len;
-
- /* Send ACK confirming the update */
- tc->flags |= TCP_CONN_SNDACK;
-
- /* Update SACK list if need be */
- if (tcp_opts_sack_permitted (&tc->opt))
- {
- /* Remove SACK blocks that have been delivered */
- tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
- }
+ tc->rcv_nxt += written;
+ 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;
+ error = TCP_ERROR_PARTIALLY_ENQUEUED;
}
else
{
- ASSERT (0);
return TCP_ERROR_FIFO_FULL;
}
- return TCP_ERROR_ENQUEUED;
+ /* Update SACK list if need be */
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ {
+ /* Remove SACK blocks that have been delivered */
+ tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
+ }
+
+ return error;
}
/** Enqueue out-of-order data */
-always_inline u32
+static int
tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
u16 data_len)
{
stream_session_t *s0;
- u32 offset, seq;
+ int rv, offset;
- s0 = stream_session_get (tc->c_s_index, tc->c_thread_index);
- seq = vnet_buffer (b)->tcp.seq_number;
- offset = seq - tc->rcv_nxt;
+ ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
+ ASSERT (data_len);
- if (svm_fifo_enqueue_with_offset (s0->server_rx_fifo, s0->pid, offset,
- data_len, vlib_buffer_get_current (b)))
- return TCP_ERROR_FIFO_FULL;
+ /* Enqueue out-of-order data with relative offset */
+ rv = session_enqueue_stream_connection (&tc->connection, b,
+ vnet_buffer (b)->tcp.seq_number -
+ tc->rcv_nxt, 0 /* queue event */ ,
+ 0);
+
+ /* Nothing written */
+ if (rv)
+ {
+ TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0);
+ return TCP_ERROR_FIFO_FULL;
+ }
+
+ TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, data_len);
/* Update SACK list if in use */
- if (tcp_opts_sack_permitted (&tc->opt))
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
ooo_segment_t *newest;
u32 start, end;
+ s0 = session_get (tc->c_s_index, tc->c_thread_index);
+
/* Get the newest segment from the fifo */
newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo);
- start = tc->rcv_nxt + ooo_segment_offset (s0->server_rx_fifo, newest);
- end = tc->rcv_nxt + ooo_segment_end_offset (s0->server_rx_fifo, newest);
-
- tcp_update_sack_list (tc, start, end);
+ if (newest)
+ {
+ offset = ooo_segment_offset (s0->server_rx_fifo, newest);
+ ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt);
+ start = tc->rcv_nxt + offset;
+ end = start + ooo_segment_length (s0->server_rx_fifo, newest);
+ tcp_update_sack_list (tc, start, end);
+ svm_fifo_newest_ooo_segment_reset (s0->server_rx_fifo);
+ TCP_EVT_DBG (TCP_EVT_CC_SACKS, tc);
+ }
}
- return TCP_ERROR_ENQUEUED;
+ return TCP_ERROR_ENQUEUED_OOO;
}
/**
- * Check if ACK could be delayed. DELACK timer is set only after frame is
- * processed so this can return true for a full bursts of packets.
+ * Check if ACK could be delayed. If ack can be delayed, it should return
+ * true for a full frame. If we're always acking return 0.
*/
always_inline int
tcp_can_delack (tcp_connection_t * tc)
{
- /* If there's no DELACK timer set and the last window sent wasn't 0 we
- * can safely delay. */
- if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)
- && (tc->flags & TCP_CONN_SENT_RCV_WND0) == 0
- && (tc->flags & TCP_CONN_SNDACK) == 0)
- return 1;
+ /* Send ack if ... */
+ if (TCP_ALWAYS_ACK
+ /* just sent a rcv wnd 0 */
+ || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0
+ /* constrained to send ack */
+ || (tc->flags & TCP_CONN_SNDACK) != 0
+ /* we're almost out of tx wnd */
+ || tcp_available_cc_snd_space (tc) < 4 * tc->snd_mss)
+ return 0;
+
+ return 1;
+}
+static int
+tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
+{
+ u32 discard, first = b->current_length;
+ vlib_main_t *vm = vlib_get_main ();
+
+ /* Handle multi-buffer segments */
+ if (n_bytes_to_drop > b->current_length)
+ {
+ if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
+ return -1;
+ do
+ {
+ discard = clib_min (n_bytes_to_drop, b->current_length);
+ vlib_buffer_advance (b, discard);
+ b = vlib_get_buffer (vm, b->next_buffer);
+ n_bytes_to_drop -= discard;
+ }
+ while (n_bytes_to_drop);
+ if (n_bytes_to_drop > first)
+ b->total_length_not_including_first_buffer -= n_bytes_to_drop - first;
+ }
+ else
+ vlib_buffer_advance (b, n_bytes_to_drop);
+ vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop;
return 0;
}
+/**
+ * Receive buffer for connection and handle acks
+ *
+ * It handles both in order or out-of-order data.
+ */
static int
-tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b,
- u16 n_data_bytes, u32 * next0)
+tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ vlib_buffer_t * b)
{
- u32 error = 0;
+ u32 error, n_bytes_to_drop, n_data_bytes;
+
+ vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
+ n_data_bytes = vnet_buffer (b)->tcp.data_len;
+ ASSERT (n_data_bytes);
/* Handle out-of-order data */
if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
{
- error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
-
- /* Don't send more than 3 dupacks per burst
- * XXX decide if this is good */
- if (tc->snt_dupacks < 3)
+ /* Old sequence numbers allowed through because they overlapped
+ * the rx window */
+ if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt))
{
- /* RFC2581: Send DUPACK for fast retransmit */
- tcp_make_ack (tc, b);
- *next0 = tcp_next_output (tc->c_is_ip4);
-
- /* Mark as DUPACK. We may filter these in output if
- * the burst fills the holes. */
- vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK;
+ /* Completely in the past (possible retransmit). Ack
+ * retransmissions since we may not have any data to send */
+ if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
+ {
+ tcp_program_ack (wrk, tc);
+ error = TCP_ERROR_SEGMENT_OLD;
+ goto done;
+ }
- tc->snt_dupacks++;
+ /* Chop off the bytes in the past and see if what is left
+ * can be enqueued in order */
+ n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number;
+ n_data_bytes -= n_bytes_to_drop;
+ vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt;
+ if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
+ {
+ error = TCP_ERROR_SEGMENT_OLD;
+ goto done;
+ }
+ goto in_order;
}
+ /* RFC2581: Enqueue and send DUPACK for fast retransmit */
+ error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
+ tcp_program_dupack (wrk, tc);
+ TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
goto done;
}
+in_order:
+
/* In order data, enqueue. Fifo figures out by itself if any out-of-order
* segments can be enqueued after fifo tail offset changes. */
error = tcp_session_enqueue_data (tc, b, n_data_bytes);
-
- TCP_EVT_DBG (TCP_EVT_INPUT, tc, n_data_bytes);
-
- /* Check if ACK can be delayed */
if (tcp_can_delack (tc))
{
- /* Nothing to do for pure ACKs */
- if (n_data_bytes == 0)
- goto done;
-
- /* If connection has not been previously marked for delay ack
- * add it to the list and flag it */
- if (!tc->flags & TCP_CONN_DELACK)
- {
- vec_add1 (tm->delack_connections[tc->c_thread_index],
- tc->c_c_index);
- tc->flags |= TCP_CONN_DELACK;
- }
+ if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK))
+ tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME);
+ goto done;
}
- else
- {
- /* Check if a packet has already been enqueued to output for burst.
- * If yes, then drop this one, otherwise, let it pass through to
- * output */
- if ((tc->flags & TCP_CONN_BURSTACK) == 0)
- {
- *next0 = tcp_next_output (tc->c_is_ip4);
- tcp_make_ack (tc, b);
- error = TCP_ERROR_ENQUEUED;
- /* TODO: maybe add counter to ensure N acks will be sent/burst */
- tc->flags |= TCP_CONN_BURSTACK;
- }
- }
+ tcp_program_ack (wrk, tc);
done:
return error;
}
-void
-delack_timers_init (tcp_main_t * tm, u32 thread_index)
+typedef struct
{
- tcp_connection_t *tc;
- u32 i, *conns;
- tw_timer_wheel_16t_2w_512sl_t *tw;
+ tcp_header_t tcp_header;
+ tcp_connection_t tcp_connection;
+} tcp_rx_trace_t;
- tw = &tm->timer_wheels[thread_index];
- conns = tm->delack_connections[thread_index];
- for (i = 0; i < vec_len (conns); i++)
- {
- tc = pool_elt_at_index (tm->connections[thread_index], conns[i]);
- ASSERT (0 != tc);
+static u8 *
+format_tcp_rx_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
+ u32 indent = format_get_indent (s);
- tc->timers[TCP_TIMER_DELACK]
- = tw_timer_start_16t_2w_512sl (tw, conns[i],
- TCP_TIMER_DELACK, TCP_DELACK_TIME);
- }
- vec_reset_length (tm->delack_connections[thread_index]);
+ s = format (s, "%U\n%U%U",
+ format_tcp_header, &t->tcp_header, 128,
+ format_white_space, indent,
+ format_tcp_connection, &t->tcp_connection, 1);
+
+ return s;
}
-always_inline uword
-tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip4)
+static u8 *
+format_tcp_rx_trace_short (u8 * s, va_list * args)
{
- u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->cpu_index, errors = 0;
- tcp_main_t *tm = vnet_get_tcp_main ();
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
+ s = format (s, "%d -> %d (%U)",
+ clib_net_to_host_u16 (t->tcp_header.dst_port),
+ clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state,
+ t->tcp_connection.state);
- next_index = node->cached_next_index;
+ return s;
+}
- while (n_left_from > 0)
+static void
+tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0,
+ tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4)
+{
+ if (tc0)
{
- u32 n_left_to_next;
+ clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection));
+ }
+ else
+ {
+ th0 = tcp_buffer_hdr (b0);
+ }
+ clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
+}
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+static void
+tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, u8 is_ip4)
+{
+ u32 *from, n_left;
- while (n_left_from > 0 && n_left_to_next > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *th0 = 0;
- tcp_connection_t *tc0;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- u32 n_advance_bytes0, n_data_bytes0;
- u32 next0 = TCP_ESTABLISHED_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED;
+ n_left = frame->n_vectors;
+ from = vlib_frame_vector_args (frame);
+
+ while (n_left >= 1)
+ {
+ tcp_connection_t *tc0;
+ tcp_rx_trace_t *t0;
+ tcp_header_t *th0;
+ vlib_buffer_t *b0;
+ u32 bi0;
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
- b0 = vlib_get_buffer (vm, bi0);
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
- my_thread_index);
+ vm->thread_index);
+ th0 = tcp_buffer_hdr (b0);
+ tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4);
+ }
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto drop;
- }
+ from += 1;
+ n_left -= 1;
+ }
+}
- /* Checksum computed by ipx_local no need to compute again */
+always_inline void
+tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
+ u8 is_ip4, u32 evt, u32 val)
+{
+ if (is_ip4)
+ vlib_node_increment_counter (vm, tcp4_node, evt, val);
+ else
+ vlib_node_increment_counter (vm, tcp6_node, evt, val);
+}
- if (is_ip4)
- {
- ip40 = vlib_buffer_get_current (b0);
- th0 = ip4_next_header (ip40);
- n_advance_bytes0 = (ip4_header_bytes (ip40)
- + tcp_header_bytes (th0));
- n_data_bytes0 = clib_net_to_host_u16 (ip40->length)
- - n_advance_bytes0;
- }
- else
- {
- ip60 = vlib_buffer_get_current (b0);
- th0 = ip6_next_header (ip60);
- n_advance_bytes0 = tcp_header_bytes (th0);
- n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length)
- - n_advance_bytes0;
- n_advance_bytes0 += sizeof (ip60[0]);
- }
+#define tcp_maybe_inc_counter(node_id, err, count) \
+{ \
+ if (next0 != tcp_next_drop (is_ip4)) \
+ tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
+ tcp6_##node_id##_node.index, is_ip4, err, \
+ 1); \
+}
+#define tcp_inc_counter(node_id, err, count) \
+ tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
+ tcp6_##node_id##_node.index, is_ip4, \
+ err, count)
+#define tcp_maybe_inc_err_counter(cnts, err) \
+{ \
+ cnts[err] += (next0 != tcp_next_drop (is_ip4)); \
+}
+#define tcp_inc_err_counter(cnts, err, val) \
+{ \
+ cnts[err] += val; \
+}
+#define tcp_store_err_counters(node_id, cnts) \
+{ \
+ int i; \
+ for (i = 0; i < TCP_N_ERROR; i++) \
+ if (cnts[i]) \
+ tcp_inc_counter(node_id, i, cnts[i]); \
+}
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (th0) + tcp_is_fin (th0) + n_data_bytes0;
- /* TODO header prediction fast path */
+always_inline uword
+tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_ip4)
+{
+ u32 thread_index = vm->thread_index, errors = 0;
+ 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;
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0)))
- {
- error0 = TCP_ERROR_SEGMENT_INVALID;
- goto drop;
- }
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ tcp_established_trace_frame (vm, node, frame, is_ip4);
- /* 5: check the ACK field */
- if (tcp_rcv_ack (tc0, b0, th0, &next0, &error0))
- {
- goto drop;
- }
+ first_buffer = from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
- /* 6: check the URG bit TODO */
+ while (n_left_from > 0)
+ {
+ u32 bi0, error0 = TCP_ERROR_ACK_OK;
+ vlib_buffer_t *b0;
+ tcp_header_t *th0 = 0;
+ tcp_connection_t *tc0;
- /* 7: process the segment text */
- vlib_buffer_advance (b0, n_advance_bytes0);
- error0 = tcp_segment_rcv (tm, tc0, b0, n_data_bytes0, &next0);
+ 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);
+ }
- /* 8: check the FIN bit */
- if (tcp_fin (th0))
- {
- /* Enter CLOSE-WAIT and notify session. Don't send ACK, instead
- * wait for session to call close. To avoid lingering
- * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
- tc0->state = TCP_STATE_CLOSE_WAIT;
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
- stream_session_disconnect_notify (&tc0->connection);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
- }
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
- drop:
- b0->error = node->errors[error0];
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
+ b0 = vlib_get_buffer (vm, bi0);
+ tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
+ thread_index);
- }
+ if (PREDICT_FALSE (tc0 == 0))
+ {
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto done;
+ }
+
+ 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);
+
+ /* 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;
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ /* TODO header prediction fast path */
+
+ /* 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;
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
+ /* 5: check the ACK field */
+ if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0)))
+ goto done;
- errors = session_manager_flush_enqueue_events (my_thread_index);
- if (errors)
- {
- if (is_ip4)
- vlib_node_increment_counter (vm, tcp4_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
- else
- vlib_node_increment_counter (vm, tcp6_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
+ /* 6: check the URG bit TODO */
+
+ /* 7: process the segment text */
+ if (vnet_buffer (b0)->tcp.data_len)
+ error0 = tcp_segment_rcv (wrk, tc0, b0);
+
+ /* 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;
+ }
+
+ done:
+ tcp_inc_err_counter (err_counters, error0, 1);
}
- delack_timers_init (tm, my_thread_index);
+ 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_handle_postponed_dequeues (wrk);
+ vlib_buffer_free (vm, first_buffer, frame->n_vectors);
- return from_frame->n_vectors;
+ return frame->n_vectors;
}
static uword
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
vlib_node_registration_t tcp4_syn_sent_node;
vlib_node_registration_t tcp6_syn_sent_node;
-always_inline uword
-tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip4)
+static u8
+tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->cpu_index, errors = 0;
- u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP;
+ transport_connection_t *tmp = 0;
+ u64 handle;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
+ if (!tc)
+ return 1;
- next_index = node->cached_next_index;
+ /* Proxy case */
+ if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN)
+ return 1;
- while (n_left_from > 0)
- {
- u32 n_left_to_next;
+ u8 is_valid = (tc->c_lcl_port == hdr->dst_port
+ && (tc->state == TCP_STATE_LISTEN
+ || tc->c_rmt_port == hdr->src_port));
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ if (!is_valid)
+ {
+ handle = session_lookup_half_open_handle (&tc->connection);
+ tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF,
+ tc->c_proto, tc->c_is_ip4);
- while (n_left_from > 0 && n_left_to_next > 0)
+ if (tmp)
{
- u32 bi0, ack0, seq0;
- vlib_buffer_t *b0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- u32 n_advance_bytes0, n_data_bytes0;
- tcp_connection_t *new_tc0;
- u32 next0 = TCP_SYN_SENT_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED;
+ if (tmp->lcl_port == hdr->dst_port
+ && tmp->rmt_port == hdr->src_port)
+ {
+ TCP_DBG ("half-open is valid!");
+ }
+ }
+ }
+ return is_valid;
+}
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+/**
+ * Lookup transport connection
+ */
+static tcp_connection_t *
+tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
+ u8 is_ip4)
+{
+ tcp_header_t *tcp;
+ transport_connection_t *tconn;
+ tcp_connection_t *tc;
+ u8 is_filtered = 0;
+ if (is_ip4)
+ {
+ ip4_header_t *ip4;
+ ip4 = vlib_buffer_get_current (b);
+ tcp = ip4_next_header (ip4);
+ tconn = session_lookup_connection_wt4 (fib_index,
+ &ip4->dst_address,
+ &ip4->src_address,
+ tcp->dst_port,
+ tcp->src_port,
+ TRANSPORT_PROTO_TCP,
+ thread_index, &is_filtered);
+ tc = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc, tcp));
+ }
+ else
+ {
+ ip6_header_t *ip6;
+ ip6 = vlib_buffer_get_current (b);
+ tcp = ip6_next_header (ip6);
+ tconn = session_lookup_connection_wt6 (fib_index,
+ &ip6->dst_address,
+ &ip6->src_address,
+ tcp->dst_port,
+ tcp->src_port,
+ TRANSPORT_PROTO_TCP,
+ thread_index, &is_filtered);
+ tc = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc, tcp));
+ }
+ return tc;
+}
- b0 = vlib_get_buffer (vm, bi0);
- tc0 =
- tcp_half_open_connection_get (vnet_buffer (b0)->
- tcp.connection_index);
+always_inline uword
+tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, int is_ip4)
+{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ 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);
- ack0 = vnet_buffer (b0)->tcp.ack_number;
- seq0 = vnet_buffer (b0)->tcp.seq_number;
+ from = first_buffer = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
- /* Checksum computed by ipx_local no need to compute again */
+ while (n_left_from > 0)
+ {
+ 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;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 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;
+ }
- if (is_ip4)
- {
- ip40 = vlib_buffer_get_current (b0);
- tcp0 = ip4_next_header (ip40);
- n_advance_bytes0 = (ip4_header_bytes (ip40)
- + tcp_header_bytes (tcp0));
- n_data_bytes0 = clib_net_to_host_u16 (ip40->length)
- - n_advance_bytes0;
- }
- else
- {
- ip60 = vlib_buffer_get_current (b0);
- tcp0 = ip6_next_header (ip60);
- n_advance_bytes0 = tcp_header_bytes (tcp0);
- n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length)
- - n_advance_bytes0;
- n_advance_bytes0 += sizeof (ip60[0]);
- }
+ /* 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 (PREDICT_FALSE
- (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0)))
- goto drop;
+ ack0 = vnet_buffer (b0)->tcp.ack_number;
+ seq0 = vnet_buffer (b0)->tcp.seq_number;
+ tcp0 = tcp_buffer_hdr (b0);
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = seq0 + tcp_is_syn (tcp0)
- + tcp_is_fin (tcp0) + n_data_bytes0;
+ /* 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;
+ }
- /*
- * 1. check the ACK bit
- */
+ if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0)
+ && !tcp_syn (tcp0)))
+ {
+ error0 = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /*
- * 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))
+ /* 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))
{
- if (ack0 <= tc0->iss || ack0 > tc0->snd_nxt)
- {
- if (!tcp_rst (tcp0))
- tcp_send_reset (b0, is_ip4);
-
- goto drop;
- }
-
- /* Make sure ACK is valid */
- if (tc0->snd_una > ack0)
- goto drop;
+ if (!tcp_rst (tcp0))
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ error0 = TCP_ERROR_RCV_WND;
+ goto drop;
}
- /*
- * 2. check the RST bit
- */
-
- if (tcp_rst (tcp0))
+ /* Make sure ACK is valid */
+ if (seq_gt (tc0->snd_una, ack0))
{
- /* If ACK is acceptable, signal client that peer is not
- * willing to accept connection and drop connection*/
- if (tcp_ack (tcp0))
- {
- stream_session_connect_notify (&tc0->connection, sst,
- 1 /* fail */ );
- tcp_connection_cleanup (tc0);
- }
+ error0 = TCP_ERROR_ACK_INVALID;
goto drop;
}
+ }
- /*
- * 3. check the security and precedence (skipped)
- */
-
- /*
- * 4. check the SYN bit
- */
-
- /* No SYN flag. Drop. */
- if (!tcp_syn (tcp0))
- goto drop;
-
- /* Stop connection establishment and retransmit timers */
- tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
- tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT_SYN);
-
- /* 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_thread_index = my_thread_index;
-
- /* Cleanup half-open connection XXX lock */
- pool_put (tm->half_open_connections, tc0);
-
- new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
- new_tc0->irs = seq0;
-
- /* Parse options */
- tcp_options_parse (tcp0, &new_tc0->opt);
+ /*
+ * 2. check the RST bit
+ */
- if (tcp_opts_tstamp (&new_tc0->opt))
- {
- new_tc0->tsval_recent = new_tc0->opt.tsval;
- new_tc0->tsval_recent_age = tcp_time_now ();
- }
+ 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;
+ }
- if (tcp_opts_wscale (&new_tc0->opt))
- new_tc0->snd_wscale = new_tc0->opt.wscale;
+ /*
+ * 3. check the security and precedence (skipped)
+ */
- /* No scaling */
- new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window);
- new_tc0->snd_wl1 = seq0;
- new_tc0->snd_wl2 = ack0;
+ /*
+ * 4. check the SYN bit
+ */
- tcp_connection_init_vars (new_tc0);
+ /* No SYN flag. Drop. */
+ if (!tcp_syn (tcp0))
+ {
+ clib_warning ("not synack");
+ error0 = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /* SYN-ACK: See if we can switch to ESTABLISHED state */
- if (tcp_ack (tcp0))
- {
- /* Our SYN is ACKed: we have iss < ack = snd_una */
+ /* Parse options */
+ if (tcp_options_parse (tcp0, &tc0->rcv_opts))
+ {
+ clib_warning ("options parse fail");
+ error0 = TCP_ERROR_OPTIONS;
+ goto drop;
+ }
- /* TODO Dequeue acknowledged segments if we support Fast Open */
- new_tc0->snd_una = ack0;
- new_tc0->state = TCP_STATE_ESTABLISHED;
+ /* 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 ();
+ }
- /* Make sure las is initialized for the wnd computation */
- new_tc0->rcv_las = new_tc0->rcv_nxt;
+ if (tcp_opts_wscale (&new_tc0->rcv_opts))
+ new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
- /* Notify app that we have connection */
- stream_session_connect_notify (&new_tc0->connection, sst, 0);
+ 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;
- /* Make sure after data segment processing ACK is sent */
- new_tc0->flags |= TCP_CONN_SNDACK;
- }
- /* 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 */
- stream_session_connect_notify (&new_tc0->connection, sst, 0);
+ /* 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 */
- 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 (n_data_bytes0)
- {
- error0 =
- tcp_segment_rcv (tm, new_tc0, b0, n_data_bytes0, &next0);
- if (error0 == TCP_ERROR_PURE_ACK)
- error0 = TCP_ERROR_SYN_ACKS_RCVD;
- }
- 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))
+ /* 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;
}
- 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);
- }
-
- errors = session_manager_flush_enqueue_events (my_thread_index);
- if (errors)
- {
- if (is_ip4)
- vlib_node_increment_counter (vm, tcp4_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
+ /* 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
- vlib_node_increment_counter (vm, tcp6_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
+ {
+ 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;
}
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
#define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
foreach_tcp_state_next
#undef _
- }
-,};
+ },
+ .format_trace = format_tcp_rx_trace_short,
+};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv);
+
+vlib_node_registration_t tcp4_rcv_process_node;
+vlib_node_registration_t tcp6_rcv_process_node;
+
/**
* Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
* as per RFC793 p. 64
tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
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->cpu_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;
-
- 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, error0 = TCP_ERROR_NONE;
+ tcp_header_t *tcp0 = 0;
+ tcp_connection_t *tc0;
+ vlib_buffer_t *b0;
+ u8 is_fin0;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ 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;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- u32 n_advance_bytes0, n_data_bytes0;
- u32 next0 = TCP_RCV_PROCESS_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED;
+ 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;
}
+ }
- /* Checksum computed by ipx_local no need to compute again */
+ /*
+ * Special treatment for CLOSED
+ */
+ if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
+ {
+ error0 = TCP_ERROR_CONNECTION_CLOSED;
+ goto drop;
+ }
- if (is_ip4)
- {
- ip40 = vlib_buffer_get_current (b0);
- tcp0 = ip4_next_header (ip40);
- n_advance_bytes0 = (ip4_header_bytes (ip40)
- + tcp_header_bytes (tcp0));
- n_data_bytes0 = clib_net_to_host_u16 (ip40->length)
- - n_advance_bytes0;
- }
- else
- {
- ip60 = vlib_buffer_get_current (b0);
- tcp0 = ip6_next_header (ip60);
- n_advance_bytes0 = tcp_header_bytes (tcp0);
- n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length)
- - n_advance_bytes0;
- n_advance_bytes0 += sizeof (ip60[0]);
- }
+ /*
+ * For all other states (except LISTEN)
+ */
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (tcp0) + tcp_is_fin (tcp0) + n_data_bytes0;
+ /* 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.
*/
- switch (tc0->state)
+ if (!tcp_rcv_ack_is_acceptable (tc0, b0))
{
- case TCP_STATE_CLOSED:
+ TCP_DBG ("connection not accepted");
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ error0 = TCP_ERROR_ACK_INVALID;
goto drop;
- break;
}
- /*
- * 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;
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE
- (tcp_segment_validate (vm, tc0, b0, tcp0, &next0)))
+ 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;
+
+ /* Still have to send the FIN */
+ if (tc0->flags & TCP_CONN_FINPNDG)
{
- error0 = TCP_ERROR_SEGMENT_INVALID;
- goto drop;
+ /* 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)
+ {
+ 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_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;
- /* 5: check the ACK field */
- switch (tc0->state)
+ if (tc0->flags & TCP_CONN_FINPNDG)
{
- 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_send_reset (b0, is_ip4);
- goto drop;
- }
- /* Switch state to ESTABLISHED */
- tc0->state = TCP_STATE_ESTABLISHED;
-
- /* Initialize session variables */
- tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
- tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
- << tc0->opt.wscale;
- tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
- tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
-
- /* Shoulder tap the server */
- stream_session_accept_notify (&tc0->connection);
-
- /* Reset SYN-ACK retransmit timer */
- tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT);
- 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))
- 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))
- goto drop;
-
- /* If FIN is ACKed */
- if (tc0->snd_una == tc0->snd_una_max)
+ /* TX fifo finally drained */
+ if (!session_tx_fifo_max_dequeue (&tc0->connection))
{
- tc0->state = TCP_STATE_FIN_WAIT_2;
- /* Stop all timers, 2MSL will be set lower */
+ 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))
- goto drop;
- /* check if rtx queue is empty and ack CLOSE TODO */
- break;
- case TCP_STATE_CLOSE_WAIT:
- /* Do the same processing as for the ESTABLISHED state. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- goto drop;
- 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))
- goto drop;
-
- /* XXX test that send queue empty */
- tc0->state = TCP_STATE_TIME_WAIT;
- goto drop;
-
- break;
- case TCP_STATE_LAST_ACK:
- /* The only thing that can 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))
- goto drop;
-
- tc0->state = TCP_STATE_CLOSED;
+ }
+ 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;
- /* Don't delete the connection/session yet. Instead, wait a
- * reasonable amount of time until the pipes are cleared. In
- * particular, this makes sure that we won't have dead sessions
- * when processing events on the tx path */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
+ 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;
- /* Stop retransmit */
- tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT);
+ 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;
-
- 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. */
-
- /* TODO */
+ }
+ 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;
- default:
- ASSERT (0);
}
- /* 6: check the URG bit TODO */
+ tc0->state = TCP_STATE_CLOSED;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- /* 7: process the segment text */
- switch (tc0->state)
- {
- case TCP_STATE_ESTABLISHED:
- case TCP_STATE_FIN_WAIT_1:
- case TCP_STATE_FIN_WAIT_2:
- error0 = tcp_segment_rcv (tm, tc0, b0, n_data_bytes0, &next0);
- 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;
- }
+ /* 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);
+
+ 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. */
- /* 8: check the FIN bit */
- if (!tcp_fin (tcp0))
+ if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
goto drop;
- 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);
- next0 = tcp_next_output (tc0->c_is_ip4);
- stream_session_disconnect_notify (&tc0->connection);
- tc0->state = TCP_STATE_CLOSE_WAIT;
- 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_TIME_WAIT;
- tcp_connection_timers_reset (tc0);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
- break;
- case TCP_STATE_FIN_WAIT_2:
- /* Got FIN, send ACK! */
- tc0->state = TCP_STATE_TIME_WAIT;
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- break;
- case TCP_STATE_TIME_WAIT:
- /* Remain in the TIME-WAIT state. Restart the 2 MSL time-wait
- * timeout.
- */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
- break;
- }
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
+ tcp_program_ack (wrk, tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ goto drop;
- b0->error = error0 ? node->errors[error0] : 0;
+ break;
+ default:
+ ASSERT (0);
+ }
- drop:
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
+ /* 6: check the URG bit TODO */
- }
+ /* 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;
+ }
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ /* 8: check the FIN bit */
+ if (!is_fin0)
+ goto drop;
+
+ 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);
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
+ drop:
- errors = session_manager_flush_enqueue_events (my_thread_index);
- if (errors)
- {
- if (is_ip4)
- vlib_node_increment_counter (vm, tcp4_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
- else
- vlib_node_increment_counter (vm, tcp6_established_node.index,
- TCP_ERROR_EVENT_FIFO_FULL, errors);
+ 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,
+ thread_index);
+ tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors);
+ tcp_handle_postponed_dequeues (wrk);
+ vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
+
return from_frame->n_vectors;
}
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
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;
- u32 my_thread_index = vm->cpu_index;
- tcp_main_t *tm = vnet_get_tcp_main ();
- u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP;
+ 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);
+ 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;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index);
- while (n_left_from > 0 && n_left_to_next > 0)
+ if (is_ip4)
{
- u32 bi0;
- vlib_buffer_t *b0;
- 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_SYNS_RCVD, next0 = TCP_LISTEN_NEXT_DROP;
-
- 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);
- lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index);
-
- 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);
- }
-
- /* Create child session. For syn-flood protection use filter */
-
- /* 1. first check for an RST */
- if (tcp_rst (th0))
- goto drop;
-
- /* 2. second check for an ACK */
- if (tcp_ack (th0))
- {
- tcp_send_reset (b0, is_ip4);
- goto drop;
- }
+ ip40 = vlib_buffer_get_current (b0);
+ th0 = ip4_next_header (ip40);
+ }
+ else
+ {
+ ip60 = vlib_buffer_get_current (b0);
+ th0 = ip6_next_header (ip60);
+ }
- /* 3. check for a SYN (did that already) */
+ /* Create child session. For syn-flood protection use filter */
- /* Create child session and send SYN-ACK */
- pool_get (tm->connections[my_thread_index], child0);
- memset (child0, 0, sizeof (*child0));
+ /* 1. first check for an RST: handled in dispatch */
+ /* if (tcp_rst (th0))
+ goto drop;
+ */
- child0->c_c_index = child0 - tm->connections[my_thread_index];
- child0->c_lcl_port = lc0->c_lcl_port;
- child0->c_rmt_port = th0->src_port;
- child0->c_is_ip4 = is_ip4;
- child0->c_thread_index = my_thread_index;
+ /* 2. second check for an ACK: handled in dispatch */
+ /* if (tcp_ack (th0))
+ {
+ tcp_send_reset (b0, is_ip4);
+ 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));
- }
+ /* 3. check for a SYN (did that already) */
- if (stream_session_accept (&child0->connection, lc0->c_s_index, sst,
- 0 /* notify */ ))
- {
- error0 = TCP_ERROR_CREATE_SESSION_FAIL;
- 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;
+ }
- tcp_options_parse (th0, &child0->opt);
+ /* 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;
- child0->irs = vnet_buffer (b0)->tcp.seq_number;
- child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1;
- child0->state = TCP_STATE_SYN_RCVD;
+ 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));
+ }
- /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK}
- * segments are used to initialize PAWS. */
- if (tcp_opts_tstamp (&child0->opt))
- {
- child0->tsval_recent = child0->opt.tsval;
- child0->tsval_recent_age = tcp_time_now ();
- }
+ if (tcp_options_parse (th0, &child0->rcv_opts))
+ {
+ clib_warning ("options parse fail");
+ goto drop;
+ }
- if (tcp_opts_wscale (&child0->opt))
- child0->snd_wscale = child0->opt.wscale;
+ 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];
- /* No scaling */
- child0->snd_wnd = clib_net_to_host_u16 (th0->window);
- child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
- child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
+ /* 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 ();
+ }
- tcp_connection_init_vars (child0);
+ if (tcp_opts_wscale (&child0->rcv_opts))
+ child0->snd_wscale = child0->rcv_opts.wscale;
- TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0);
+ 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;
- /* Reuse buffer to make syn-ack and send */
- tcp_make_synack (child0, b0);
- next0 = tcp_next_output (is_ip4);
+ tcp_connection_init_vars (child0);
+ TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1);
- drop:
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
+ 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_send_synack (child0);
+ tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME);
- 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;
}
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
foreach_tcp_state_next
#undef _
},
+ .format_trace = format_tcp_rx_trace_short,
};
/* *INDENT-ON* */
TCP_INPUT_NEXT_SYN_SENT,
TCP_INPUT_NEXT_ESTABLISHED,
TCP_INPUT_NEXT_RESET,
+ TCP_INPUT_NEXT_PUNT,
TCP_INPUT_N_NEXT
} tcp_input_next_t;
#define foreach_tcp4_input_next \
- _ (DROP, "error-drop") \
+ _ (DROP, "ip4-drop") \
_ (LISTEN, "tcp4-listen") \
_ (RCV_PROCESS, "tcp4-rcv-process") \
_ (SYN_SENT, "tcp4-syn-sent") \
_ (ESTABLISHED, "tcp4-established") \
- _ (RESET, "tcp4-reset")
+ _ (RESET, "tcp4-reset") \
+ _ (PUNT, "ip4-punt")
#define foreach_tcp6_input_next \
- _ (DROP, "error-drop") \
+ _ (DROP, "ip6-drop") \
_ (LISTEN, "tcp6-listen") \
_ (RCV_PROCESS, "tcp6-rcv-process") \
_ (SYN_SENT, "tcp6-syn-sent") \
_ (ESTABLISHED, "tcp6-established") \
- _ (RESET, "tcp6-reset")
+ _ (RESET, "tcp6-reset") \
+ _ (PUNT, "ip6-punt")
-typedef struct
+#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
+
+static void
+tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4)
{
- u16 src_port;
- u16 dst_port;
- u8 state;
-} tcp_rx_trace_t;
+ tcp_connection_t *tc;
+ tcp_header_t *tcp;
+ tcp_rx_trace_t *t;
+ int i;
-u8 *
-format_tcp_rx_trace (u8 * s, va_list * args)
+ for (i = 0; i < n_bufs; i++)
+ {
+ if (bs[i]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ t = vlib_add_trace (vm, node, bs[i], sizeof (*t));
+ tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index,
+ vm->thread_index);
+ tcp = vlib_buffer_get_current (bs[i]);
+ tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4);
+ }
+ }
+}
+
+static void
+tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4)
{
- CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
- CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
- tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
+ if (*error == TCP_ERROR_FILTERED)
+ {
+ *next = TCP_INPUT_NEXT_DROP;
+ }
+ else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6))
+ {
+ *next = TCP_INPUT_NEXT_PUNT;
+ *error = TCP_ERROR_PUNT;
+ }
+ else
+ {
+ *next = TCP_INPUT_NEXT_RESET;
+ *error = TCP_ERROR_NO_LISTENER;
+ }
+}
- s = format (s, "TCP: src-port %d dst-port %U%s\n",
- clib_net_to_host_u16 (t->src_port),
- clib_net_to_host_u16 (t->dst_port), format_tcp_state, t->state);
+static inline tcp_connection_t *
+tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error,
+ u8 is_ip4)
+{
+ u32 fib_index = vnet_buffer (b)->ip.fib_index;
+ int n_advance_bytes, n_data_bytes;
+ transport_connection_t *tc;
+ tcp_header_t *tcp;
+ u8 is_filtered = 0;
- return s;
+ if (is_ip4)
+ {
+ ip4_header_t *ip4 = vlib_buffer_get_current (b);
+ tcp = ip4_next_header (ip4);
+ vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4;
+ n_advance_bytes = (ip4_header_bytes (ip4) + tcp_header_bytes (tcp));
+ n_data_bytes = clib_net_to_host_u16 (ip4->length) - n_advance_bytes;
+
+ /* Length check. Checksum computed by ipx_local no need to compute again */
+ if (PREDICT_FALSE (n_advance_bytes < 0))
+ {
+ *error = TCP_ERROR_LENGTH;
+ return 0;
+ }
+
+ tc = session_lookup_connection_wt4 (fib_index, &ip4->dst_address,
+ &ip4->src_address, tcp->dst_port,
+ tcp->src_port, TRANSPORT_PROTO_TCP,
+ thread_index, &is_filtered);
+ }
+ else
+ {
+ ip6_header_t *ip6 = vlib_buffer_get_current (b);
+ tcp = ip6_next_header (ip6);
+ vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip6;
+ n_advance_bytes = tcp_header_bytes (tcp);
+ n_data_bytes = clib_net_to_host_u16 (ip6->payload_length)
+ - n_advance_bytes;
+ n_advance_bytes += sizeof (ip6[0]);
+
+ if (PREDICT_FALSE (n_advance_bytes < 0))
+ {
+ *error = TCP_ERROR_LENGTH;
+ return 0;
+ }
+
+ tc = session_lookup_connection_wt6 (fib_index, &ip6->dst_address,
+ &ip6->src_address, tcp->dst_port,
+ tcp->src_port, TRANSPORT_PROTO_TCP,
+ thread_index, &is_filtered);
+ }
+
+ vnet_buffer (b)->tcp.seq_number = clib_net_to_host_u32 (tcp->seq_number);
+ vnet_buffer (b)->tcp.ack_number = clib_net_to_host_u32 (tcp->ack_number);
+ vnet_buffer (b)->tcp.data_offset = n_advance_bytes;
+ vnet_buffer (b)->tcp.data_len = n_data_bytes;
+ vnet_buffer (b)->tcp.flags = 0;
+
+ *error = is_filtered ? TCP_ERROR_FILTERED : *error;
+
+ return tcp_get_connection_from_transport (tc);
}
-#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
+static inline void
+tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc,
+ vlib_buffer_t * b, u16 * next, u32 * error)
+{
+ tcp_header_t *tcp;
+ u8 flags;
+
+ tcp = tcp_buffer_hdr (b);
+ flags = tcp->flags & filter_flags;
+ *next = tm->dispatch_table[tc->state][flags].next;
+ *error = tm->dispatch_table[tc->state][flags].error;
+
+ if (PREDICT_FALSE (*error == TCP_ERROR_DISPATCH
+ || *next == TCP_INPUT_NEXT_RESET))
+ {
+ /* Overload tcp flags to store state */
+ tcp_state_t state = tc->state;
+ vnet_buffer (b)->tcp.flags = tc->state;
+
+ if (*error == TCP_ERROR_DISPATCH)
+ clib_warning ("disp error state %U flags %U", format_tcp_state,
+ state, format_tcp_flags, (int) flags);
+ }
+}
always_inline uword
tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip4)
+ vlib_frame_t * frame, int is_ip4)
{
- u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->cpu_index;
+ u32 n_left_from, *from, thread_index = vm->thread_index;
tcp_main_t *tm = vnet_get_tcp_main ();
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+ u16 nexts[VLIB_FRAME_SIZE], *next;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
+ tcp_set_time_now (tcp_get_worker (thread_index));
- next_index = node->cached_next_index;
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ vlib_get_buffers (vm, from, bufs, n_left_from);
- while (n_left_from > 0)
+ b = bufs;
+ next = nexts;
+
+ while (n_left_from >= 4)
{
- u32 n_left_to_next;
+ u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER;
+ tcp_connection_t *tc0, *tc1;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ {
+ vlib_prefetch_buffer_header (b[2], STORE);
+ CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
- while (n_left_from > 0 && n_left_to_next > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- u32 error0 = TCP_ERROR_NO_LISTENER, next0 = TCP_INPUT_NEXT_DROP;
- u8 flags0;
+ vlib_prefetch_buffer_header (b[3], STORE);
+ CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ next[0] = next[1] = TCP_INPUT_NEXT_DROP;
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
+ tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4);
+ tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4);
- b0 = vlib_get_buffer (vm, bi0);
- vnet_buffer (b0)->tcp.flags = 0;
+ if (PREDICT_TRUE (!tc0 + !tc1 == 0))
+ {
+ ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0])));
+ ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1])));
+
+ vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
+ vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
- if (is_ip4)
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0);
+ tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1);
+ }
+ else
+ {
+ if (PREDICT_TRUE (tc0 != 0))
{
- ip40 = vlib_buffer_get_current (b0);
- tcp0 = ip4_next_header (ip40);
-
- /* lookup session */
- tc0 =
- (tcp_connection_t *)
- stream_session_lookup_transport4 (&ip40->dst_address,
- &ip40->src_address,
- tcp0->dst_port,
- tcp0->src_port,
- SESSION_TYPE_IP4_TCP,
- my_thread_index);
+ ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0])));
+ vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0);
}
else
- {
- ip60 = vlib_buffer_get_current (b0);
- tcp0 = ip6_next_header (ip60);
- tc0 =
- (tcp_connection_t *)
- stream_session_lookup_transport6 (&ip60->src_address,
- &ip60->dst_address,
- tcp0->src_port,
- tcp0->dst_port,
- SESSION_TYPE_IP6_TCP,
- my_thread_index);
- }
+ tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
- /* Session exists */
- if (PREDICT_TRUE (0 != tc0))
+ if (PREDICT_TRUE (tc1 != 0))
{
- /* Save connection index */
- vnet_buffer (b0)->tcp.connection_index = tc0->c_c_index;
- vnet_buffer (b0)->tcp.seq_number =
- clib_net_to_host_u32 (tcp0->seq_number);
- vnet_buffer (b0)->tcp.ack_number =
- clib_net_to_host_u32 (tcp0->ack_number);
-
- flags0 = tcp0->flags & filter_flags;
- next0 = tm->dispatch_table[tc0->state][flags0].next;
- error0 = tm->dispatch_table[tc0->state][flags0].error;
-
- if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH))
- {
- /* Overload tcp flags to store state */
- vnet_buffer (b0)->tcp.flags = tc0->state;
- }
+ ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1])));
+ vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
+ tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1);
}
else
- {
- /* Send reset */
- next0 = TCP_INPUT_NEXT_RESET;
- error0 = TCP_ERROR_NO_LISTENER;
- }
-
- b0->error = error0 ? node->errors[error0] : 0;
+ tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
+ }
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
+ b += 2;
+ next += 2;
+ n_left_from -= 2;
+ }
+ while (n_left_from > 0)
+ {
+ tcp_connection_t *tc0;
+ u32 error0 = TCP_ERROR_NO_LISTENER;
- }
+ if (n_left_from > 1)
+ {
+ vlib_prefetch_buffer_header (b[1], STORE);
+ CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ next[0] = TCP_INPUT_NEXT_DROP;
+ tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4);
+ if (PREDICT_TRUE (tc0 != 0))
+ {
+ ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0])));
+ vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0);
}
+ else
+ tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ b += 1;
+ next += 1;
+ n_left_from -= 1;
}
- return from_frame->n_vectors;
+ if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
+ tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4);
+
+ vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+ return frame->n_vectors;
}
static uword
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input);
-void
-tcp_update_time (f64 now, u32 thread_index)
-{
- tcp_main_t *tm = vnet_get_tcp_main ();
- tw_timer_expire_timers_16t_2w_512sl (&tm->timer_wheels[thread_index], now);
-}
static void
tcp_dispatch_table_init (tcp_main_t * tm)
/* SYNs for new connections -> tcp-listen. */
_(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
+ _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE);
+ _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_RST_RCVD);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
+ TCP_ERROR_NONE);
/* 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);
/* SYN-ACK for a SYN */
_(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
TCP_ERROR_NONE);
_(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
TCP_ERROR_NONE);
_(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
+ TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
+ TCP_ERROR_NONE);
/* ACK or FIN-ACK to our FIN */
_(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
/* FIN in reply to our FIN from the other side */
_(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
/* FIN confirming that the peer (app) has closed */
_(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
+ _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
_(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN, 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);
+ _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
+ _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
+ _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_CONNECTION_CLOSED);
#undef _
}
-clib_error_t *
+static clib_error_t *
tcp_input_init (vlib_main_t * vm)
{
clib_error_t *error = 0;
Code Review / vpp.git / blobdiff