/*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*/
#include <vppinfra/sparse_vec.h>
-#include <vnet/tcp/tcp_packet.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/ip6_fib.h>
#include <vnet/tcp/tcp.h>
+#include <vnet/tcp/tcp_inlines.h>
#include <vnet/session/session.h>
#include <math.h>
#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;
-
/**
* Validate segment sequence number. As per RFC793:
*
&& seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd));
}
-/**
- * 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;
- u8 opt_len, opts_len, kind;
- int j;
- sack_block_t b;
-
- opts_len = (tcp_doff (th) << 2) - sizeof (tcp_header_t);
- 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
- | TCP_OPTS_FLAG_SACK);
-
- for (; opts_len > 0; opts_len -= opt_len, data += opt_len)
- {
- kind = data[0];
-
- /* Get options length */
- if (kind == TCP_OPTION_EOL)
- break;
- else if (kind == TCP_OPTION_NOOP)
- {
- opt_len = 1;
- continue;
- }
- else
- {
- /* broken options */
- if (opts_len < 2)
- return -1;
- opt_len = data[1];
-
- /* weird option length */
- if (opt_len < 2 || opt_len > opts_len)
- return -1;
- }
-
- /* Parse options */
- switch (kind)
- {
- case TCP_OPTION_MSS:
- if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th))
- {
- to->flags |= TCP_OPTS_FLAG_MSS;
- to->mss = clib_net_to_host_u16 (*(u16 *) (data + 2));
- }
- break;
- case TCP_OPTION_WINDOW_SCALE:
- if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th))
- {
- to->flags |= TCP_OPTS_FLAG_WSCALE;
- to->wscale = data[2];
- if (to->wscale > TCP_MAX_WND_SCALE)
- {
- clib_warning ("Illegal window scaling value: %d",
- to->wscale);
- to->wscale = TCP_MAX_WND_SCALE;
- }
- }
- break;
- case TCP_OPTION_TIMESTAMP:
- if (opt_len == TCP_OPTION_LEN_TIMESTAMP)
- {
- to->flags |= TCP_OPTS_FLAG_TSTAMP;
- to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2));
- to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6));
- }
- break;
- case TCP_OPTION_SACK_PERMITTED:
- if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th))
- to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
- break;
- case TCP_OPTION_SACK_BLOCK:
- /* If SACK permitted was not advertised or a SYN, break */
- if ((to->flags & TCP_OPTS_FLAG_SACK_PERMITTED) == 0 || tcp_syn (th))
- break;
-
- /* If too short or not correctly formatted, break */
- if (opt_len < 10 || ((opt_len - 2) % TCP_OPTION_LEN_SACK_BLOCK))
- break;
-
- to->flags |= TCP_OPTS_FLAG_SACK;
- to->n_sack_blocks = (opt_len - 2) / TCP_OPTION_LEN_SACK_BLOCK;
- vec_reset_length (to->sacks);
- for (j = 0; j < to->n_sack_blocks; 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;
- default:
- /* Nothing to see here */
- 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
always_inline int
tcp_segment_check_paws (tcp_connection_t * tc)
{
- return tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent
+ return tcp_opts_tstamp (&tc->rcv_opts)
&& timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent);
}
{
ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval));
tc->tsval_recent = tc->rcv_opts.tsval;
- tc->tsval_recent_age = tcp_time_now ();
+ tc->tsval_recent_age = tcp_time_tstamp (tc->c_thread_index);
+ }
+}
+
+static void
+tcp_handle_rst (tcp_connection_t * tc)
+{
+ switch (tc->rst_state)
+ {
+ case TCP_STATE_SYN_RCVD:
+ /* Cleanup everything. App wasn't notified yet */
+ session_transport_delete_notify (&tc->connection);
+ tcp_connection_cleanup (tc);
+ break;
+ case TCP_STATE_SYN_SENT:
+ session_stream_connect_notify (&tc->connection, SESSION_E_REFUSED);
+ tcp_connection_cleanup (tc);
+ break;
+ case TCP_STATE_ESTABLISHED:
+ session_transport_reset_notify (&tc->connection);
+ session_transport_closed_notify (&tc->connection);
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_FIN_WAIT_1:
+ case TCP_STATE_FIN_WAIT_2:
+ case TCP_STATE_CLOSING:
+ case TCP_STATE_LAST_ACK:
+ session_transport_closed_notify (&tc->connection);
+ break;
+ case TCP_STATE_CLOSED:
+ case TCP_STATE_TIME_WAIT:
+ break;
+ default:
+ TCP_DBG ("reset state: %u", tc->state);
+ }
+}
+
+static void
+tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ if (!tcp_disconnect_pending (tc))
+ {
+ tc->rst_state = tc->state;
+ vec_add1 (wrk->pending_resets, tc->c_c_index);
+ tcp_disconnect_pending_on (tc);
+ }
+}
+
+/**
+ * Handle reset packet
+ *
+ * Programs disconnect/reset notification that should be sent
+ * later by calling @ref tcp_handle_disconnects
+ */
+static void
+tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ TCP_EVT (TCP_EVT_RST_RCVD, tc);
+ switch (tc->state)
+ {
+ case TCP_STATE_SYN_RCVD:
+ tcp_program_reset_ntf (wrk, tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ break;
+ case TCP_STATE_SYN_SENT:
+ /* Do not program ntf because the connection is half-open */
+ tc->rst_state = tc->state;
+ tcp_handle_rst (tc);
+ break;
+ case TCP_STATE_ESTABLISHED:
+ tcp_connection_timers_reset (tc);
+ tcp_cong_recovery_off (tc);
+ tcp_program_reset_ntf (wrk, tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_FIN_WAIT_1:
+ case TCP_STATE_FIN_WAIT_2:
+ case TCP_STATE_CLOSING:
+ case TCP_STATE_LAST_ACK:
+ tcp_connection_timers_reset (tc);
+ tcp_cong_recovery_off (tc);
+ tcp_program_reset_ntf (wrk, tc);
+ /* Make sure we mark the session as closed. In some states we may
+ * be still trying to send data */
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
+ break;
+ case TCP_STATE_CLOSED:
+ case TCP_STATE_TIME_WAIT:
+ break;
+ default:
+ TCP_DBG ("reset state: %u", tc->state);
}
}
* @return 0 if segments passes validation.
*/
static int
-tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0,
- vlib_buffer_t * b0, tcp_header_t * th0,
- u32 * next0, u32 * error0)
+tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
+ vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0)
{
/* We could get a burst of RSTs interleaved with acks */
if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
{
tcp_send_reset (tc0);
*error0 = TCP_ERROR_CONNECTION_CLOSED;
- goto drop;
+ goto error;
}
if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0)))
{
*error0 = TCP_ERROR_SEGMENT_INVALID;
- goto drop;
+ goto error;
}
- if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts)))
+ if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0)))
{
- clib_warning ("options parse error");
*error0 = TCP_ERROR_OPTIONS;
- goto drop;
+ goto error;
}
if (PREDICT_FALSE (tcp_segment_check_paws (tc0)))
{
*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);
+ TCP_EVT (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_tstamp (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?");
+ tc0->tsval_recent = tc0->rcv_opts.tsval;
+ clib_warning ("paws failed: 24-day old segment");
}
- else
+ /* Drop after ack if not rst. Resets can fail paws check as per
+ * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT
+ * be subjected to the PAWS check by verifying an acceptable value in
+ * SEG.TSval */
+ else if (!tcp_rst (th0))
{
- /* Drop after ack if not rst */
- if (!tcp_rst (th0))
- {
- tcp_make_ack (tc0, b0);
- TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
- goto error;
- }
+ tcp_program_ack (tc0);
+ TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
+ goto error;
}
- goto drop;
}
/* 1st: check sequence number */
if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number,
vnet_buffer (b0)->tcp.seq_end))
{
- *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))
+ /* SYN/SYN-ACK retransmit */
+ if (tcp_syn (th0)
+ && vnet_buffer (b0)->tcp.seq_number == tc0->rcv_nxt - 1)
{
- /* If not RST, send dup ack */
- if (!tcp_rst (th0))
+ tcp_options_parse (th0, &tc0->rcv_opts, 1);
+ if (tc0->state == TCP_STATE_SYN_RCVD)
{
- tcp_make_ack (tc0, b0);
- TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
- goto error;
+ tcp_send_synack (tc0);
+ TCP_EVT (TCP_EVT_SYN_RCVD, tc0, 0);
+ *error0 = TCP_ERROR_SYNS_RCVD;
}
- goto drop;
+ else
+ {
+ tcp_program_ack (tc0);
+ TCP_EVT (TCP_EVT_SYNACK_RCVD, tc0);
+ *error0 = TCP_ERROR_SYN_ACKS_RCVD;
+ }
+ goto error;
+ }
+
+ /* 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 < tc0->snd_mss
+ && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)
+ goto check_reset;
+
+ /* If we entered recovery and peer did so as well, there's a chance that
+ * dup acks won't be acceptable on either end because seq_end may be less
+ * than rcv_las. This can happen if acks are lost in both directions. */
+ if (tcp_in_recovery (tc0)
+ && seq_geq (vnet_buffer (b0)->tcp.seq_number,
+ tc0->rcv_las - tc0->rcv_wnd)
+ && seq_leq (vnet_buffer (b0)->tcp.seq_end,
+ tc0->rcv_nxt + tc0->rcv_wnd))
+ goto check_reset;
+
+ *error0 = TCP_ERROR_RCV_WND;
+
+ /* If we advertised a zero rcv_wnd and the segment is in the past or the
+ * next one that we expect, it is probably a window probe */
+ if ((tc0->flags & TCP_CONN_ZERO_RWND_SENT)
+ && seq_lt (vnet_buffer (b0)->tcp.seq_end,
+ tc0->rcv_las + tc0->rcv_opts.mss))
+ *error0 = TCP_ERROR_ZERO_RWND;
+
+ tc0->errors.below_data_wnd += seq_lt (vnet_buffer (b0)->tcp.seq_end,
+ tc0->rcv_las);
+
+ /* If not RST, send dup ack */
+ if (!tcp_rst (th0))
+ {
+ tcp_program_dupack (tc0);
+ TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
}
+ goto error;
+
+ check_reset:
+ ;
}
/* 2nd: check the RST bit */
if (PREDICT_FALSE (tcp_rst (th0)))
{
- tcp_connection_reset (tc0);
+ tcp_rcv_rst (wrk, tc0);
*error0 = TCP_ERROR_RST_RCVD;
- goto drop;
+ goto error;
}
/* 3rd: check security and precedence (skip) */
- /* 4th: check the SYN bit */
+ /* 4th: check the SYN bit (in window) */
if (PREDICT_FALSE (tcp_syn (th0)))
{
- /* TODO implement RFC 5961 */
- if (tc0->state == TCP_STATE_SYN_RCVD)
- {
- tcp_make_synack (tc0, b0);
- TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0);
- }
- else
- {
- tcp_make_ack (tc0, b0);
- TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0);
- }
+ /* As per RFC5961 send challenge ack instead of reset */
+ tcp_program_ack (tc0);
+ *error0 = TCP_ERROR_SPURIOUS_SYN;
goto error;
}
vnet_buffer (b0)->tcp.seq_end);
return 0;
-drop:
- *next0 = tcp_next_drop (tc0->c_is_ip4);
- return -1;
error:
- *next0 = tcp_next_output (tc0->c_is_ip4);
return -1;
}
always_inline int
-tcp_rcv_ack_is_acceptable (tcp_connection_t * tc0, vlib_buffer_t * tb0)
+tcp_rcv_ack_no_cc (tcp_connection_t * tc, vlib_buffer_t * b, u32 * error)
{
/* SND.UNA =< SEG.ACK =< SND.NXT */
- return (seq_leq (tc0->snd_una, vnet_buffer (tb0)->tcp.ack_number)
- && seq_leq (vnet_buffer (tb0)->tcp.ack_number, tc0->snd_nxt));
+ if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number)
+ && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
+ {
+ if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
+ && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
+ {
+ tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
+ goto acceptable;
+ }
+ *error = TCP_ERROR_ACK_INVALID;
+ return -1;
+ }
+
+acceptable:
+ tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
+ tc->snd_una = vnet_buffer (b)->tcp.ack_number;
+ *error = TCP_ERROR_ACK_OK;
+ return 0;
}
/**
* Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298
*
- * Note that although the original article, srtt and rttvar are scaled
+ * Note that although in the original article srtt and rttvar are scaled
* to minimize round-off errors, here we don't. Instead, we rely on
* better precision time measurements.
*
- * TODO support us rtt resolution
+ * A known limitation of the algorithm is that a drop in rtt results in a
+ * rttvar increase and bigger RTO.
+ *
+ * mrtt must be provided in @ref TCP_TICK multiples, i.e., in us. Note that
+ * timestamps are measured as ms ticks so they must be converted before
+ * calling this function.
*/
static void
tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt)
{
int err, diff;
- if (tc->srtt != 0)
- {
- err = mrtt - tc->srtt;
-
- /* XXX Drop in RTT results in RTTVAR increase and bigger RTO.
- * The increase should be bound */
- 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;
- }
+ err = mrtt - tc->srtt;
+ 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);
}
-void
-tcp_update_rto (tcp_connection_t * tc)
+static inline void
+tcp_estimate_rtt_us (tcp_connection_t * tc, f64 mrtt)
{
- tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX);
- tc->rto = clib_max (tc->rto, TCP_RTO_MIN);
+ tc->mrtt_us = tc->mrtt_us + (mrtt - tc->mrtt_us) * 0.125;
}
/**
- * Update RTT estimate and RTO timer
+ * Update rtt estimate
*
- * 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.
+ * We have potentially three sources of rtt measurements:
*
- * This should be called only if previously sent bytes have been acked.
+ * TSOPT difference between current and echoed timestamp. It has ms
+ * precision and can be computed per ack
+ * ACK timing one sequence number is tracked per rtt with us (micro second)
+ * precision.
+ * rate sample if enabled, all outstanding bytes are tracked with us
+ * precision. Every ack and sack are a rtt sample
*
- * return 1 if valid rtt 0 otherwise
+ * Middle boxes are known to fiddle with TCP options so we give higher
+ * priority to ACK timing.
+ *
+ * For now, rate sample rtts are only used under congestion.
*/
static int
-tcp_update_rtt (tcp_connection_t * tc, u32 ack)
+tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack)
{
u32 mrtt = 0;
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
- if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)
+ if (tcp_in_cong_recovery (tc))
{
- if (tcp_in_recovery (tc))
- return 0;
- goto done;
+ /* Accept rtt estimates for samples that have not been retransmitted */
+ if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ || (rs->flags & TCP_BTS_IS_RXT))
+ goto done;
+ if (rs->rtt_time)
+ tcp_estimate_rtt_us (tc, rs->rtt_time);
+ mrtt = rs->rtt_time * THZ;
+ goto estimate_rtt;
}
if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
{
- mrtt = tcp_time_now () - tc->rtt_ts;
+ f64 sample = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts;
+ tcp_estimate_rtt_us (tc, sample);
+ mrtt = clib_max ((u32) (sample * THZ), 1);
+ /* Allow measuring of a new RTT */
+ tc->rtt_ts = 0;
}
/* As per RFC7323 TSecr can be used for RTTM only if the segment advances
* snd_una, i.e., the left side of the send window:
* seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */
else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr)
{
- mrtt = tcp_time_now () - tc->rcv_opts.tsecr;
+ mrtt = clib_max (tcp_tstamp (tc) - tc->rcv_opts.tsecr, 1);
+ mrtt *= TCP_TSTP_TO_HZ;
}
+estimate_rtt:
+
/* Ignore dubious measurements */
if (mrtt == 0 || mrtt > TCP_RTT_MAX)
goto done;
done:
- /* 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;
return 0;
}
-/**
- * Dequeue bytes that have been acked and while at it update RTT estimates.
- */
-static void
-tcp_dequeue_acked (tcp_connection_t * tc, u32 ack)
-{
- /* Dequeue the newly ACKed add SACKed bytes */
- stream_session_dequeue_drop (&tc->connection,
- tc->bytes_acked + tc->sack_sb.snd_una_adv);
-
- tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
-
- /* Update rtt and rto */
- tcp_update_rtt (tc, ack);
-
- /* If everything has been acked, stop retransmit timer
- * otherwise update. */
- tcp_retransmit_timer_update (tc);
-}
-
-/**
- * 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 == prev_snd_una)
- && seq_gt (tc->snd_una_max, tc->snd_una)
- && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
- && (prev_snd_wnd == tc->snd_wnd));
-}
-
-/**
- * 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;
-
- if (hole->next != TCP_INVALID_SACK_HOLE_INDEX)
- {
- 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)
- {
- prev = pool_elt_at_index (sb->holes, hole->prev);
- prev->next = hole->next;
- }
- else
- {
- 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)
- memset (hole, 0xfe, sizeof (*hole));
-
- pool_put (sb->holes, hole);
-}
-
-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, *prev;
- u32 hole_index;
-
- pool_get (sb->holes, hole);
- memset (hole, 0, sizeof (*hole));
-
- hole->start = start;
- hole->end = end;
- hole_index = scoreboard_hole_index (sb, hole);
-
- prev = scoreboard_get_hole (sb, prev_index);
- if (prev)
- {
- 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;
- }
- else
- {
- sb->head = hole_index;
- hole->prev = TCP_INVALID_SACK_HOLE_INDEX;
- hole->next = TCP_INVALID_SACK_HOLE_INDEX;
- }
-
- return hole;
-}
-
-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_sent_1_smss,
- u8 * can_rescue, u8 * snd_limited)
+tcp_estimate_initial_rtt (tcp_connection_t * tc)
{
- 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);
+ u8 thread_index = vlib_num_workers ()? 1 : 0;
+ int mrtt;
- /* Nothing, return */
- if (!hole)
+ if (tc->rtt_ts)
{
- 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);
+ tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts;
+ tc->mrtt_us = clib_max (tc->mrtt_us, 0.0001);
+ mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1);
+ tc->rtt_ts = 0;
}
else
{
- /* Rule (2): output takes care of transmitting new data */
- if (!have_sent_1_smss)
- {
- hole = 0;
- sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX;
- }
- /* Rule (3): if hole not lost */
- else if (seq_lt (hole->start, sb->high_sacked))
- {
- *snd_limited = 1;
- 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;
- }
+ mrtt = tcp_tstamp (tc) - tc->rcv_opts.tsecr;
+ mrtt = clib_max (mrtt, 1) * TCP_TSTP_TO_HZ;
+ /* Due to retransmits we don't know the initial mrtt */
+ if (tc->rto_boff && mrtt > 1 * THZ)
+ mrtt = 1 * THZ;
+ tc->mrtt_us = (f64) mrtt *TCP_TICK;
}
- 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 seq)
-{
- sack_scoreboard_hole_t *hole;
- hole = scoreboard_first_hole (sb);
- if (hole)
+ if (mrtt > 0 && mrtt < TCP_RTT_MAX)
{
- seq = seq_gt (seq, hole->start) ? seq : hole->start;
- sb->cur_rxt_hole = sb->head;
- }
- sb->high_rxt = seq;
-}
-
-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);
+ /* First measurement as per RFC 6298 */
+ tc->srtt = mrtt;
+ tc->rttvar = mrtt >> 1;
}
- 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;
+ tcp_update_rto (tc);
}
/**
- * Test that scoreboard is sane after recovery
- *
- * Returns 1 if scoreboard is empty or if first hole beyond
- * snd_una.
+ * Dequeue bytes for connections that have received acks in last burst
*/
-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, *last_hole;
- u32 blk_index = 0, old_sacked_bytes, hole_index;
- int i, j;
-
- 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;
-
- old_sacked_bytes = sb->sacked_bytes;
-
- /* 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->rcv_opts.sacks, tmp);
- }
-
- 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->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->rcv_opts.sacks[i];
- tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j];
- tc->rcv_opts.sacks[j] = tmp;
- }
-
- if (sb->head == TCP_INVALID_SACK_HOLE_INDEX)
- {
- /* 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;
- }
+static void
+tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk)
+{
+ u32 thread_index = wrk->vm->thread_index;
+ u32 *pending_deq_acked;
+ tcp_connection_t *tc;
+ int i;
- /* Walk the holes with the SACK blocks */
- hole = pool_elt_at_index (sb->holes, sb->head);
- while (hole && blk_index < vec_len (tc->rcv_opts.sacks))
+ 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++)
{
- blk = &tc->rcv_opts.sacks[blk_index];
- if (seq_leq (blk->start, hole->start))
- {
- /* Block covers hole. Remove hole */
- if (seq_geq (blk->end, hole->end))
- {
- next_hole = scoreboard_next_hole (sb, hole);
+ tc = tcp_connection_get (pending_deq_acked[i], thread_index);
+ tc->flags &= ~TCP_CONN_DEQ_PENDING;
- /* Byte accounting: snd_una needs to be advanced */
- if (blk->end == ack)
- {
- 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
- {
- ASSERT (seq_geq (sb->high_sacked, ack));
- sb->snd_una_adv = sb->high_sacked - ack;
- sb->last_bytes_delivered += sb->high_sacked - hole->end;
- }
- }
+ if (PREDICT_FALSE (!tc->burst_acked))
+ continue;
- scoreboard_remove_hole (sb, hole);
- hole = next_hole;
- }
- /* Partial 'head' overlap */
- else
- {
- if (seq_gt (blk->end, hole->start))
- {
- hole->start = blk->end;
- }
- blk_index++;
- }
- }
- else
- {
- /* Hole must be split */
- if (seq_lt (blk->end, hole->end))
- {
- 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 if (seq_lt (blk->start, hole->end))
- {
- hole->end = blk->start;
- }
- hole = scoreboard_next_hole (sb, hole);
- }
+ /* Dequeue the newly ACKed bytes */
+ session_tx_fifo_dequeue_drop (&tc->connection, tc->burst_acked);
+ tcp_validate_txf_size (tc, tc->snd_nxt - tc->snd_una);
+
+ if (tcp_is_descheduled (tc))
+ tcp_reschedule (tc);
+
+ /* If everything has been acked, stop retransmit timer
+ * otherwise update. */
+ tcp_retransmit_timer_update (&wrk->timer_wheel, tc);
+
+ /* Update pacer based on our new cwnd estimate */
+ tcp_connection_tx_pacer_update (tc);
+
+ tc->burst_acked = 0;
}
+ _vec_len (wrk->pending_deq_acked) = 0;
+}
- if (pool_elts (sb->holes) == 1)
+static void
+tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ if (!(tc->flags & TCP_CONN_DEQ_PENDING))
{
- hole = scoreboard_first_hole (sb);
- if (hole->start == ack + sb->snd_una_adv
- && hole->end == tc->snd_una_max)
- scoreboard_remove_hole (sb, hole);
+ vec_add1 (wrk->pending_deq_acked, tc->c_c_index);
+ tc->flags |= TCP_CONN_DEQ_PENDING;
}
-
- 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
- || 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));
- ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc)
- || sb->holes[sb->head].start == ack + sb->snd_una_adv);
- TCP_EVT_DBG (TCP_EVT_CC_SCOREBOARD, tc);
+ tc->burst_acked += tc->bytes_acked;
}
/**
tc->snd_wnd = snd_wnd;
tc->snd_wl1 = seq;
tc->snd_wl2 = ack;
- TCP_EVT_DBG (TCP_EVT_SND_WND, tc);
+ TCP_EVT (TCP_EVT_SND_WND, tc);
- if (tc->snd_wnd < tc->snd_mss)
+ if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
{
/* Set persist timer if not set and we just got 0 wnd */
if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST)
&& !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))
- tcp_persist_timer_set (tc);
+ {
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+ tcp_persist_timer_set (&wrk->timer_wheel, tc);
+ }
}
else
{
- tcp_persist_timer_reset (tc);
- if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
+ if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST)))
+ {
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+ tcp_persist_timer_reset (&wrk->timer_wheel, tc);
+ }
+
+ if (PREDICT_FALSE (tcp_is_descheduled (tc)))
+ tcp_reschedule (tc);
+
+ if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
{
tc->rto_boff = 0;
tcp_update_rto (tc);
* Triggered by dup acks as opposed to timer timeout. Note that cwnd is
* updated in @ref tcp_cc_handle_event after fast retransmit
*/
-void
+static void
tcp_cc_init_congestion (tcp_connection_t * tc)
{
tcp_fastrecovery_on (tc);
- tc->snd_congestion = tc->snd_una_max;
+ tc->snd_congestion = tc->snd_nxt;
tc->cwnd_acc_bytes = 0;
- tc->cc_algo->congestion (tc);
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4);
-}
+ tc->snd_rxt_bytes = 0;
+ tc->rxt_delivered = 0;
+ tc->prr_delivered = 0;
+ tc->prr_start = tc->snd_una;
+ tc->prev_ssthresh = tc->ssthresh;
+ tc->prev_cwnd = tc->cwnd;
-static void
-tcp_cc_recovery_exit (tcp_connection_t * 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);
-}
+ tc->snd_rxt_ts = tcp_tstamp (tc);
+ tcp_cc_congestion (tc);
-void
-tcp_cc_fastrecovery_exit (tcp_connection_t * tc)
-{
- tc->cc_algo->recovered (tc);
- tc->snd_rxt_bytes = 0;
- tc->rcv_dupacks = 0;
- tc->snd_nxt = tc->snd_una_max;
- tcp_fastrecovery_off (tc);
- tcp_fastrecovery_1_smss_off (tc);
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
+ /* 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 */
+ if (!tcp_opts_sack_permitted (&tc->rcv_opts))
+ tc->cwnd += TCP_DUPACK_THRESHOLD * tc->snd_mss;
+
+ tc->fr_occurences += 1;
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 4);
}
static void
{
tc->cwnd = tc->prev_cwnd;
tc->ssthresh = tc->prev_ssthresh;
- tc->snd_nxt = tc->snd_una_max;
- tc->rcv_dupacks = 0;
- if (tcp_in_recovery (tc))
- tcp_cc_recovery_exit (tc);
+ tcp_cc_undo_recovery (tc);
ASSERT (tc->rto_boff == 0);
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5);
- /* TODO extend for fastrecovery */
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 5);
}
-static u8
-tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
+static inline u8
+tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc)
{
return (tcp_in_recovery (tc) && tc->rto_boff == 1
&& tc->snd_rxt_ts
&& timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
}
+static inline u8
+tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
+{
+ return (tcp_cc_is_spurious_timeout_rxt (tc));
+}
+
+static inline u8
+tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack)
+{
+ if (!has_sack)
+ {
+ /* 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 0;
+ }
+ }
+ return tc->sack_sb.lost_bytes || tc->rcv_dupacks >= tc->sack_sb.reorder;
+}
+
static int
tcp_cc_recover (tcp_connection_t * tc)
{
+ sack_scoreboard_hole_t *hole;
+ u8 is_spurious = 0;
+
ASSERT (tcp_in_cong_recovery (tc));
+
if (tcp_cc_is_spurious_retransmit (tc))
{
tcp_cc_congestion_undo (tc);
- return 1;
+ is_spurious = 1;
}
- if (tcp_in_recovery (tc))
- tcp_cc_recovery_exit (tc);
- else if (tcp_in_fastrecovery (tc))
- tcp_cc_fastrecovery_exit (tc);
+ tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
+ tc->rcv_dupacks = 0;
+
+ /* Previous recovery left us congested. Continue sending as part
+ * of the current recovery event with an updated snd_congestion */
+ if (tc->sack_sb.sacked_bytes)
+ {
+ tc->snd_congestion = tc->snd_nxt;
+ tcp_program_retransmit (tc);
+ return is_spurious;
+ }
+
+ tc->rxt_delivered = 0;
+ tc->snd_rxt_bytes = 0;
+ tc->snd_rxt_ts = 0;
+ tc->prr_delivered = 0;
+ tc->rtt_ts = 0;
+ tc->flags &= ~TCP_CONN_RXT_PENDING;
+
+ hole = scoreboard_first_hole (&tc->sack_sb);
+ if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt)
+ scoreboard_clear (&tc->sack_sb);
+
+ if (!tcp_in_recovery (tc) && !is_spurious)
+ tcp_cc_recovered (tc);
+
+ tcp_fastrecovery_off (tc);
+ tcp_fastrecovery_first_off (tc);
+ tcp_recovery_off (tc);
+ TCP_EVT (TCP_EVT_CC_EVT, tc, 3);
ASSERT (tc->rto_boff == 0);
ASSERT (!tcp_in_cong_recovery (tc));
ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
- return 0;
+
+ return is_spurious;
}
static void
-tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b)
+tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs)
{
ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
/* Congestion avoidance */
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ tcp_cc_rcv_ack (tc, rs);
/* If a cumulative ack, make sure dupacks is 0 */
tc->rcv_dupacks = 0;
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));
-}
-
/**
* One function to rule them all ... and in the darkness bind them
*/
static void
-tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
+tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
+ u32 is_dack)
{
- u32 rxt_delivered;
+ u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts);
+
+ /* If reneging, wait for timer based retransmits */
+ if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging))
+ return;
- if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts))
- {
- if (tc->bytes_acked)
- goto partial_ack;
- tcp_fast_retransmit (tc);
- return;
- }
/*
- * Duplicate ACK. Check if we should enter fast recovery, or if already in
- * it account for the bytes that left the network.
+ * If not in recovery, figure out if we should enter
*/
- else if (is_dack && !tcp_in_recovery (tc))
+ if (!tcp_in_cong_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);
+ ASSERT (is_dack);
tc->rcv_dupacks++;
+ TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
+ tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
- /* Pure duplicate ack. If some data got acked, it's handled lower */
- if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked)
+ if (tcp_should_fastrecover (tc, has_sack))
{
- ASSERT (tcp_in_fastrecovery (tc));
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
- return;
+ tcp_cc_init_congestion (tc);
+
+ if (has_sack)
+ scoreboard_init_rxt (&tc->sack_sb, tc->snd_una);
+
+ tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
+ tcp_program_retransmit (tc);
}
- else if (tcp_should_fastrecover (tc))
- {
- ASSERT (!tcp_in_fastrecovery (tc));
-
- /* If of of the two conditions lower hold, reset dupacks because
- * we're probably after timeout (RFC6582 heuristics).
- * If Cumulative ack does not cover more than congestion threshold,
- * and:
- * 1) The following doesn't hold: The congestion window is greater
- * than SMSS bytes and the difference between highest_ack
- * and prev_highest_ack is at most 4*SMSS bytes
- * 2) Echoed timestamp in the last non-dup ack does not equal the
- * stored timestamp
- */
- if (seq_leq (tc->snd_una, tc->snd_congestion)
- && ((!(tc->cwnd > tc->snd_mss
- && tc->bytes_acked <= 4 * tc->snd_mss))
- || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
- {
- tc->rcv_dupacks = 0;
- return;
- }
- tcp_cc_init_congestion (tc);
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
+ return;
+ }
- /* The first segment MUST be retransmitted */
- tcp_retransmit_first_unacked (tc);
+ /*
+ * Already in recovery
+ */
- /* Post retransmit update cwnd to ssthresh and account for the
- * three segments that have left the network and should've been
- * buffered at the receiver XXX */
- tc->cwnd = tc->ssthresh + tc->rcv_dupacks * tc->snd_mss;
- ASSERT (tc->cwnd >= tc->snd_mss);
+ /*
+ * Process (re)transmit feedback. Output path uses this to decide how much
+ * more data to release into the network
+ */
+ if (has_sack)
+ {
+ if (!tc->bytes_acked && tc->sack_sb.rxt_sacked)
+ tcp_fastrecovery_first_on (tc);
- /* If cwnd allows, send more data */
- if (tcp_opts_sack_permitted (&tc->rcv_opts))
- {
- scoreboard_init_high_rxt (&tc->sack_sb,
- tc->snd_una + tc->snd_mss);
- tcp_fast_retransmit_sack (tc);
- }
- else
- {
- tcp_fast_retransmit_no_sack (tc);
- }
- return;
- }
- else if (!tc->bytes_acked
- || (tc->bytes_acked && !tcp_in_cong_recovery (tc)))
+ tc->rxt_delivered += tc->sack_sb.rxt_sacked;
+ tc->prr_delivered += tc->bytes_acked + tc->sack_sb.last_sacked_bytes
+ - tc->sack_sb.last_bytes_delivered;
+ }
+ else
+ {
+ if (is_dack)
{
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK);
- return;
+ tc->rcv_dupacks += 1;
+ TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
}
+ tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked,
+ tc->snd_rxt_bytes);
+ if (is_dack)
+ tc->prr_delivered += clib_min (tc->snd_mss,
+ tc->snd_nxt - tc->snd_una);
else
- goto partial_ack;
- }
-
- if (!tc->bytes_acked)
- return;
+ tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked,
+ tc->snd_mss *
+ tc->rcv_dupacks);
-partial_ack:
- TCP_EVT_DBG (TCP_EVT_CC_PACK, tc);
+ /* If partial ack, assume that the first un-acked segment was lost */
+ if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
+ tcp_fastrecovery_first_on (tc);
+ }
/*
- * Legitimate ACK. 1) See if we can exit recovery
+ * See if we can exit and stop retransmitting
*/
- /* XXX limit this only to first partial ack? */
- if (seq_lt (tc->snd_una, tc->snd_congestion))
- tcp_retransmit_timer_force_update (tc);
- else
- tcp_retransmit_timer_update (tc);
-
if (seq_geq (tc->snd_una, tc->snd_congestion))
{
/* If spurious return, we've already updated everything */
return;
}
- tc->snd_nxt = tc->snd_una_max;
-
/* Treat as congestion avoidance ack */
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+ tcp_cc_rcv_ack (tc, rs);
return;
}
+ tcp_program_retransmit (tc);
+
/*
- * Legitimate ACK. 2) If PARTIAL ACK try to retransmit
+ * Notify cc of the event
*/
+ if (!tc->bytes_acked)
+ {
+ tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
+ return;
+ }
+
/* RFC6675: If the incoming ACK is a cumulative acknowledgment,
* reset dupacks to 0. Also needed if in congestion recovery */
tc->rcv_dupacks = 0;
- /* Post RTO timeout don't try anything fancy */
if (tcp_in_recovery (tc))
- {
- tc->cc_algo->rcv_ack (tc);
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
- transport_add_tx_event (&tc->connection);
- return;
- }
+ tcp_cc_rcv_ack (tc, rs);
+ else
+ tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs);
+}
- /* Remove retransmitted bytes that have been delivered */
- ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv
- >= tc->sack_sb.last_bytes_delivered
- || (tc->flags & TCP_CONN_FINSNT));
+static void
+tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
+{
+ if (!tcp_in_cong_recovery (tc))
+ return;
- if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt))
- {
- /* If we have sacks and we haven't gotten an ack beyond high_rxt,
- * remove sacked bytes delivered */
- rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv
- - tc->sack_sb.last_bytes_delivered;
- ASSERT (tc->snd_rxt_bytes >= rxt_delivered);
- tc->snd_rxt_bytes -= rxt_delivered;
- }
- else
- {
- /* Either all retransmitted holes have been acked, or we're
- * "in the blind" and retransmitting segment by segment */
- tc->snd_rxt_bytes = 0;
- }
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ tcp_rcv_sacks (tc, tc->snd_una);
- tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK);
+ tc->bytes_acked = 0;
- /*
- * Since this was a partial ack, try to retransmit some more data
- */
- tcp_fast_retransmit (tc);
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ tcp_cc_handle_event (tc, rs, 1);
+}
+
+/**
+ * Check if duplicate ack as per RFC5681 Sec. 2
+ */
+always_inline 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 == prev_snd_una)
+ && seq_gt (tc->snd_nxt, tc->snd_una)
+ && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
+ && (prev_snd_wnd == tc->snd_wnd));
+}
+
+/**
+ * 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' as well */
+ *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));
}
/**
* Process incoming ACK
*/
static int
-tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b,
- tcp_header_t * th, u32 * next, u32 * error)
+tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
+ tcp_header_t * th, u32 * error)
{
u32 prev_snd_wnd, prev_snd_una;
+ tcp_rate_sample_t rs = { 0 };
u8 is_dack;
- TCP_EVT_DBG (TCP_EVT_CC_STAT, tc);
+ TCP_EVT (TCP_EVT_CC_STAT, tc);
/* 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)))
{
- /* 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))
+ /* We've probably entered recovery and the peer still has some
+ * of the data we've sent. Update snd_nxt and accept the ack */
+ if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
+ && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
{
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_make_ack (tc, b);
- *next = tcp_next_output (tc->c_is_ip4);
- *error = TCP_ERROR_ACK_INVALID;
- 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;
+ tc->errors.above_ack_wnd += 1;
*error = TCP_ERROR_ACK_FUTURE;
+ TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number);
+ return -1;
}
/* If old ACK, probably it's an old dupack */
if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)))
{
+ tc->errors.below_ack_wnd += 1;
*error = TCP_ERROR_ACK_OLD;
- 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);
+ TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number);
+
+ if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd))
+ return -1;
+
+ tcp_handle_old_ack (tc, &rs);
+
/* Don't drop yet */
return 0;
}
+process_ack:
+
/*
* Looks okay, process feedback
*/
-process_ack:
+
if (tcp_opts_sack_permitted (&tc->rcv_opts))
tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_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;
+ tc->snd_una = vnet_buffer (b)->tcp.ack_number;
tcp_validate_txf_size (tc, tc->bytes_acked);
- if (tc->bytes_acked)
- tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number);
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_sample_delivery_rate (tc, &rs);
+
+ if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes)
+ {
+ tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number);
+ if (tc->bytes_acked)
+ tcp_program_dequeue (wrk, tc);
+ }
- TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc);
+ TCP_EVT (TCP_EVT_ACK_RCVD, tc);
/*
* 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);
+ tcp_cc_handle_event (tc, &rs, is_dack);
+ tc->dupacks_in += is_dack;
if (!tcp_in_cong_recovery (tc))
- return 0;
+ {
+ *error = TCP_ERROR_ACK_OK;
+ return 0;
+ }
*error = TCP_ERROR_ACK_DUP;
if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
return 0;
/*
* Update congestion control (slow start/congestion avoidance)
*/
- tcp_cc_update (tc, b);
+ tcp_cc_update (tc, &rs);
*error = TCP_ERROR_ACK_OK;
return 0;
}
-static u8
-tcp_sack_vector_is_sane (sack_block_t * sacks)
+static void
+tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
{
- int i;
- for (i = 1; i < vec_len (sacks); i++)
+ if (!tcp_disconnect_pending (tc))
{
- if (sacks[i - 1].end == sacks[i].start)
- return 0;
+ vec_add1 (wrk->pending_disconnects, tc->c_c_index);
+ tcp_disconnect_pending_on (tc);
}
- return 1;
}
-/**
- * Build SACK list as per RFC2018.
- *
- * Makes sure the first block contains the segment that generated the current
- * ACK and the following ones are the ones most recently reported in SACK
- * blocks.
- *
- * @param tc TCP connection for which the SACK list is updated
- * @param start Start sequence number of the newest SACK block
- * @param end End sequence of the newest SACK block
- */
-void
-tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end)
+static void
+tcp_handle_disconnects (tcp_worker_ctx_t * wrk)
{
- sack_block_t *new_list = 0, *block = 0;
+ u32 thread_index, *pending_disconnects, *pending_resets;
+ tcp_connection_t *tc;
int i;
- /* 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))
- {
- 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++)
+ if (vec_len (wrk->pending_disconnects))
{
- /* Discard if rcv_nxt advanced beyond current block */
- if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt))
- continue;
-
- /* 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)))
+ thread_index = wrk->vm->thread_index;
+ pending_disconnects = wrk->pending_disconnects;
+ for (i = 0; i < vec_len (pending_disconnects); i++)
{
- 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;
+ tc = tcp_connection_get (pending_disconnects[i], thread_index);
+ tcp_disconnect_pending_off (tc);
+ session_transport_closing_notify (&tc->connection);
}
+ _vec_len (wrk->pending_disconnects) = 0;
+ }
- /* 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
+ if (vec_len (wrk->pending_resets))
+ {
+ thread_index = wrk->vm->thread_index;
+ pending_resets = wrk->pending_resets;
+ for (i = 0; i < vec_len (pending_resets); i++)
{
- clib_warning ("sack discarded");
+ tc = tcp_connection_get (pending_resets[i], thread_index);
+ tcp_disconnect_pending_off (tc);
+ tcp_handle_rst (tc);
}
+ _vec_len (wrk->pending_resets) = 0;
}
-
- 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)
+static void
+tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
+ u32 * error)
{
- 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;
+ /* Reject out-of-order fins */
+ if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt)
+ return;
+
+ /* Account for the FIN and send ack */
+ tc->rcv_nxt += 1;
+ tc->flags |= TCP_CONN_FINRCVD;
+ tcp_program_ack (tc);
+ /* Enter CLOSE-WAIT and notify session. To avoid lingering
+ * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
+ tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
+ tcp_program_disconnect (wrk, tc);
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.closewait_time);
+ TCP_EVT (TCP_EVT_FIN_RCVD, tc);
+ *error = TCP_ERROR_FIN_RCVD;
}
/** Enqueue data for delivery to application */
ASSERT (data_len);
written = session_enqueue_stream_connection (&tc->connection, b, 0,
1 /* queue event */ , 1);
+ tc->bytes_in += written;
- TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written);
+ TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written);
/* Update rcv_nxt */
if (PREDICT_TRUE (written == data_len))
else if (written > data_len)
{
tc->rcv_nxt += written;
-
- /* Send ACK confirming the update */
- tc->flags |= TCP_CONN_SNDACK;
- TCP_EVT_DBG (TCP_EVT_CC_INPUT, tc, data_len, written);
+ TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written);
}
else if (written > 0)
{
/* We've written something but FIFO is probably full now */
tc->rcv_nxt += written;
-
- /* Depending on how fast the app is, all remaining buffers in burst will
- * not be enqueued. Inform peer */
- tc->flags |= TCP_CONN_SNDACK;
-
error = TCP_ERROR_PARTIALLY_ENQUEUED;
}
else
{
- tc->flags |= TCP_CONN_SNDACK;
+ /* Packet made it through for ack processing */
+ if (tc->rcv_wnd < tc->snd_mss)
+ return TCP_ERROR_ZERO_RWND;
+
return TCP_ERROR_FIFO_FULL;
}
/* Update SACK list if need be */
- if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ if (tcp_opts_sack_permitted (&tc->rcv_opts) && vec_len (tc->snd_sacks))
{
/* Remove SACK blocks that have been delivered */
tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
u16 data_len)
{
- stream_session_t *s0;
+ session_t *s0;
int rv, offset;
ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
/* Nothing written */
if (rv)
{
- TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0);
+ TCP_EVT (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);
+ TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len);
+ tc->bytes_in += data_len;
/* Update SACK list if in use */
if (tcp_opts_sack_permitted (&tc->rcv_opts))
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);
+ newest = svm_fifo_newest_ooo_segment (s0->rx_fifo);
if (newest)
{
- offset = ooo_segment_offset (s0->server_rx_fifo, newest);
+ offset = ooo_segment_offset_prod (s0->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);
+ end = start + ooo_segment_length (s0->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);
+ svm_fifo_newest_ooo_segment_reset (s0->rx_fifo);
+ TCP_EVT (TCP_EVT_CC_SACKS, tc);
}
}
return TCP_ERROR_ENQUEUED_OOO;
}
-/**
- * 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)
-{
- /* 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)
{
* It handles both in order or out-of-order data.
*/
static int
-tcp_segment_rcv (tcp_connection_t * tc, vlib_buffer_t * b, u32 * next0)
+tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
+ vlib_buffer_t * b)
{
u32 error, n_bytes_to_drop, n_data_bytes;
vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
n_data_bytes = vnet_buffer (b)->tcp.data_len;
ASSERT (n_data_bytes);
+ tc->data_segs_in += 1;
+
+ /* Make sure we don't consume trailing bytes */
+ if (PREDICT_FALSE (b->current_length > n_data_bytes))
+ b->current_length = n_data_bytes;
/* Handle out-of-order data */
if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
* retransmissions since we may not have any data to send */
if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
{
- tcp_make_ack (tc, b);
+ tcp_program_dupack (tc);
+ tc->errors.below_data_wnd++;
error = TCP_ERROR_SEGMENT_OLD;
- *next0 = tcp_next_output (tc->c_is_ip4);
goto done;
}
if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
{
error = TCP_ERROR_SEGMENT_OLD;
- *next0 = tcp_next_drop (tc->c_is_ip4);
goto done;
}
goto in_order;
/* RFC2581: Enqueue and send DUPACK for fast retransmit */
error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
- *next0 = tcp_next_output (tc->c_is_ip4);
- tcp_make_ack (tc, b);
- vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK;
- TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
+ tcp_program_dupack (tc);
+ TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
+ tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end,
+ tc->rcv_las + tc->rcv_wnd);
goto done;
}
/* 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);
- if (tcp_can_delack (tc))
- {
- *next0 = tcp_next_drop (tc->c_is_ip4);
- if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK))
- tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME);
- goto done;
- }
-
- *next0 = tcp_next_output (tc->c_is_ip4);
- tcp_make_ack (tc, b);
+ tcp_program_ack (tc);
done:
return error;
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 *);
+ tcp_connection_t *tc = &t->tcp_connection;
u32 indent = format_get_indent (s);
- 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);
+ s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc,
+ format_tcp_state, tc->state, format_white_space, indent,
+ format_tcp_header, &t->tcp_header, 128);
return s;
}
{
if (tc0)
{
- clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection));
+ clib_memcpy_fast (&t0->tcp_connection, tc0,
+ sizeof (t0->tcp_connection));
}
else
{
th0 = tcp_buffer_hdr (b0);
}
- clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
+ clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header));
}
static void
vlib_frame_t * frame, int is_ip4)
{
u32 thread_index = vm->thread_index, errors = 0;
- u32 n_left_from, next_index, *from, *to_next;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 err_counters[TCP_N_ERROR] = { 0 };
- u8 is_fin = 0;
+ u32 n_left_from, *from;
if (node->flags & VLIB_NODE_FLAG_TRACE)
tcp_established_trace_frame (vm, node, frame, is_ip4);
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
- next_index = node->cached_next_index;
+
+ vlib_get_buffers (vm, from, bufs, n_left_from);
+ b = bufs;
while (n_left_from > 0)
{
- u32 n_left_to_next;
+ u32 error = TCP_ERROR_ACK_OK;
+ tcp_connection_t *tc;
+ tcp_header_t *th;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
- while (n_left_from > 0 && n_left_to_next > 0)
+ if (n_left_from > 1)
{
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *th0 = 0;
- tcp_connection_t *tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ACK_OK;
-
- if (n_left_from > 1)
- {
- vlib_buffer_t *pb;
- pb = vlib_get_buffer (vm, from[1]);
- vlib_prefetch_buffer_header (pb, LOAD);
- CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
- }
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
- tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
- thread_index);
+ vlib_prefetch_buffer_header (b[1], LOAD);
+ CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto done;
- }
+ tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
+ thread_index);
- th0 = tcp_buffer_hdr (b0);
- /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
- * dangling reference. */
- is_fin = tcp_is_fin (th0);
+ if (PREDICT_FALSE (tc == 0))
+ {
+ error = TCP_ERROR_INVALID_CONNECTION;
+ goto done;
+ }
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len;
+ th = tcp_buffer_hdr (b[0]);
- /* TODO header prediction fast path */
+ /* TODO header prediction fast path */
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0,
- &error0)))
- {
- tcp_maybe_inc_err_counter (err_counters, error0);
- TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp);
- goto done;
- }
+ /* 1-4: check SEQ, RST, SYN */
+ if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], th, &error)))
+ {
+ TCP_EVT (TCP_EVT_SEG_INVALID, tc, vnet_buffer (b[0])->tcp);
+ goto done;
+ }
- /* 5: check the ACK field */
- if (PREDICT_FALSE (tcp_rcv_ack (tc0, b0, th0, &next0, &error0)))
- {
- tcp_maybe_inc_err_counter (err_counters, error0);
- goto done;
- }
+ /* 5: check the ACK field */
+ if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc, b[0], th, &error)))
+ goto done;
- /* 6: check the URG bit TODO */
+ /* 6: check the URG bit TODO */
- /* 7: process the segment text */
- if (vnet_buffer (b0)->tcp.data_len)
- {
- error0 = tcp_segment_rcv (tc0, b0, &next0);
- tcp_maybe_inc_err_counter (err_counters, error0);
- }
+ /* 7: process the segment text */
+ if (vnet_buffer (b[0])->tcp.data_len)
+ error = tcp_segment_rcv (wrk, tc, b[0]);
- /* 8: check the FIN bit */
- if (PREDICT_FALSE (is_fin))
- {
- /* Enter CLOSE-WAIT and notify session. To avoid lingering
- * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
- /* Account for the FIN if nothing else was received */
- if (vnet_buffer (b0)->tcp.data_len == 0)
- tc0->rcv_nxt += 1;
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (tc0->c_is_ip4);
- tc0->state = TCP_STATE_CLOSE_WAIT;
- stream_session_disconnect_notify (&tc0->connection);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
- tcp_inc_err_counter (err_counters, TCP_ERROR_FIN_RCVD, 1);
- }
+ /* 8: check the FIN bit */
+ if (PREDICT_FALSE (tcp_is_fin (th)))
+ tcp_rcv_fin (wrk, tc, b[0], &error);
- done:
- b0->error = node->errors[error0];
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
- }
+ done:
+ tcp_inc_err_counter (err_counters, error, 1);
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ n_left_from -= 1;
+ b += 1;
}
- errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
- thread_index);
- err_counters[TCP_ERROR_EVENT_FIFO_FULL] = errors;
+ errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
+ thread_index);
+ err_counters[TCP_ERROR_MSG_QUEUE_FULL] = errors;
tcp_store_err_counters (established, err_counters);
- tcp_flush_frame_to_output (vm, thread_index, is_ip4);
+ tcp_handle_postponed_dequeues (wrk);
+ tcp_handle_disconnects (wrk);
+ vlib_buffer_free (vm, from, frame->n_vectors);
return frame->n_vectors;
}
-static uword
-tcp4_established (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ );
}
-static uword
-tcp6_established (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp4_established_node) =
{
- .function = tcp4_established,
.name = "tcp4-established",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp4_established_node, tcp4_established);
-
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp6_established_node) =
{
- .function = tcp6_established,
.name = "tcp6-established",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established);
-
-vlib_node_registration_t tcp4_syn_sent_node;
-vlib_node_registration_t tcp6_syn_sent_node;
-
static u8
-tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr)
+tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b,
+ tcp_header_t * hdr)
{
transport_connection_t *tmp = 0;
u64 handle;
if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN)
return 1;
+ u8 is_ip_valid = 0, val_l, val_r;
+
+ if (tc->connection.is_ip4)
+ {
+ ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b);
+
+ val_l = !ip4_address_compare (&ip4_hdr->dst_address,
+ &tc->connection.lcl_ip.ip4);
+ val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1);
+ val_r = !ip4_address_compare (&ip4_hdr->src_address,
+ &tc->connection.rmt_ip.ip4);
+ val_r = val_r || tc->state == TCP_STATE_LISTEN;
+ is_ip_valid = val_l && val_r;
+ }
+ else
+ {
+ ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b);
+
+ val_l = !ip6_address_compare (&ip6_hdr->dst_address,
+ &tc->connection.lcl_ip.ip6);
+ val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0);
+ val_r = !ip6_address_compare (&ip6_hdr->src_address,
+ &tc->connection.rmt_ip.ip6);
+ val_r = val_r || tc->state == TCP_STATE_LISTEN;
+ is_ip_valid = val_l && val_r;
+ }
+
u8 is_valid = (tc->c_lcl_port == hdr->dst_port
&& (tc->state == TCP_STATE_LISTEN
- || tc->c_rmt_port == hdr->src_port));
+ || tc->c_rmt_port == hdr->src_port) && is_ip_valid);
if (!is_valid)
{
&& tmp->rmt_port == hdr->src_port)
{
TCP_DBG ("half-open is valid!");
+ is_valid = 1;
}
}
}
TRANSPORT_PROTO_TCP,
thread_index, &is_filtered);
tc = tcp_get_connection_from_transport (tconn);
- ASSERT (tcp_lookup_is_valid (tc, tcp));
+ ASSERT (tcp_lookup_is_valid (tc, b, tcp));
}
else
{
TRANSPORT_PROTO_TCP,
thread_index, &is_filtered);
tc = tcp_get_connection_from_transport (tconn);
- ASSERT (tcp_lookup_is_valid (tc, tcp));
+ ASSERT (tcp_lookup_is_valid (tc, b, tcp));
}
return tc;
}
-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 tcp_connection_t *
+tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
- u32 n_left_from, next_index, *from, *to_next;
- u32 my_thread_index = vm->thread_index, errors = 0;
+ session_t *s;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
+ if (is_ip4)
+ {
+ ip4_header_t *ip4 = vlib_buffer_get_current (b);
+ tcp_header_t *tcp = tcp_buffer_hdr (b);
+ s = session_lookup_listener4 (fib_index,
+ &ip4->dst_address,
+ tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
+ }
+ else
+ {
+ ip6_header_t *ip6 = vlib_buffer_get_current (b);
+ tcp_header_t *tcp = tcp_buffer_hdr (b);
+ s = session_lookup_listener6 (fib_index,
+ &ip6->dst_address,
+ tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
- next_index = node->cached_next_index;
+ }
+ if (PREDICT_TRUE (s != 0))
+ return tcp_get_connection_from_transport (transport_get_listener
+ (TRANSPORT_PROTO_TCP,
+ s->connection_index));
+ else
+ return 0;
+}
- while (n_left_from > 0)
+static void
+tcp46_syn_sent_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
+ u32 *from, u32 n_bufs)
+{
+ tcp_connection_t *tc = 0;
+ tcp_rx_trace_t *t;
+ vlib_buffer_t *b;
+ int i;
+
+ for (i = 0; i < n_bufs; i++)
{
- u32 n_left_to_next;
+ b = vlib_get_buffer (vm, from[i]);
+ if (!(b->flags & VLIB_BUFFER_IS_TRACED))
+ continue;
+ tc =
+ tcp_half_open_connection_get (vnet_buffer (b)->tcp.connection_index);
+ t = vlib_add_trace (vm, node, b, sizeof (*t));
+ tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
+ }
+}
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+always_inline void
+tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ const dpo_id_t *dpo;
+ const load_balance_t *lb;
+ vnet_hw_interface_t *hw_if;
+ u32 sw_if_idx, lb_idx;
- while (n_left_from > 0 && n_left_to_next > 0)
- {
- u32 bi0, ack0, seq0;
- vlib_buffer_t *b0;
- tcp_rx_trace_t *t0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- tcp_connection_t *new_tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ENQUEUED;
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
- tc0 =
- tcp_half_open_connection_get (vnet_buffer (b0)->
- tcp.connection_index);
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto drop;
- }
+ if (is_ipv4)
+ {
+ ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4);
+ lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr);
+ }
+ else
+ {
+ ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6);
+ lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr);
+ }
- /* 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;
- }
+ lb = load_balance_get (lb_idx);
+ if (PREDICT_FALSE (lb->lb_n_buckets > 1))
+ return;
+ dpo = load_balance_get_bucket_i (lb, 0);
- ack0 = vnet_buffer (b0)->tcp.ack_number;
- seq0 = vnet_buffer (b0)->tcp.seq_number;
- tcp0 = tcp_buffer_hdr (b0);
+ sw_if_idx = dpo_get_urpf (dpo);
+ if (PREDICT_FALSE (sw_if_idx == ~0))
+ return;
- /* Crude check to see if the connection handle does not match
- * the packet. Probably connection just switched to established */
- if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port
- || tcp0->src_port != tc0->c_rmt_port))
- goto drop;
+ hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx);
+ if (hw_if->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO)
+ tc->cfg_flags |= TCP_CFG_F_TSO;
+}
- if (PREDICT_FALSE
- (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0)))
- goto drop;
+always_inline uword
+tcp46_syn_sent_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame, int is_ip4)
+{
+ u32 n_left_from, *from, thread_index = vm->thread_index, errors = 0;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
- /* 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;
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
- /*
- * 1. check the ACK bit
- */
+ if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
+ tcp46_syn_sent_trace_frame (vm, node, from, n_left_from);
- /*
- * If the ACK bit is set
- * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
- * the RST bit is set, if so drop the segment and return)
- * <SEQ=SEG.ACK><CTL=RST>
- * and discard the segment. Return.
- * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
- */
- if (tcp_ack (tcp0))
- {
- if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt))
- {
- clib_warning ("ack not in rcv wnd");
- if (!tcp_rst (tcp0))
- tcp_send_reset_w_pkt (tc0, b0, is_ip4);
- goto drop;
- }
+ vlib_get_buffers (vm, from, bufs, n_left_from);
+ b = bufs;
- /* Make sure ACK is valid */
- if (seq_gt (tc0->snd_una, ack0))
- {
- clib_warning ("ack invalid");
- goto drop;
- }
- }
+ while (n_left_from > 0)
+ {
+ u32 ack, seq, error = TCP_ERROR_NONE;
+ tcp_connection_t *tc, *new_tc;
+ tcp_header_t *tcp;
- /*
- * 2. check the RST bit
- */
+ tc = tcp_half_open_connection_get (
+ vnet_buffer (b[0])->tcp.connection_index);
+ if (PREDICT_FALSE (tc == 0))
+ {
+ error = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
- if (tcp_rst (tcp0))
- {
- /* If ACK is acceptable, signal client that peer is not
- * willing to accept connection and drop connection*/
- if (tcp_ack (tcp0))
- tcp_connection_reset (tc0);
- goto drop;
- }
+ /* Half-open completed or cancelled recently but the connection
+ * was't removed yet by the owning thread */
+ if (PREDICT_FALSE (tc->flags & TCP_CONN_HALF_OPEN_DONE))
+ {
+ error = TCP_ERROR_SPURIOUS_SYN_ACK;
+ goto drop;
+ }
- /*
- * 3. check the security and precedence (skipped)
- */
+ ack = vnet_buffer (b[0])->tcp.ack_number;
+ seq = vnet_buffer (b[0])->tcp.seq_number;
+ tcp = tcp_buffer_hdr (b[0]);
- /*
- * 4. check the SYN bit
- */
+ /* Crude check to see if the connection handle does not match
+ * the packet. Probably connection just switched to established */
+ if (PREDICT_FALSE (tcp->dst_port != tc->c_lcl_port ||
+ tcp->src_port != tc->c_rmt_port))
+ {
+ error = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
+
+ if (PREDICT_FALSE (!tcp_ack (tcp) && !tcp_rst (tcp) && !tcp_syn (tcp)))
+ {
+ error = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /* No SYN flag. Drop. */
- if (!tcp_syn (tcp0))
+ /* SYNs consume sequence numbers */
+ vnet_buffer (b[0])->tcp.seq_end += tcp_is_syn (tcp);
+
+ /*
+ * 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 (tcp))
+ {
+ if (seq_leq (ack, tc->iss) || seq_gt (ack, tc->snd_nxt))
{
- clib_warning ("not synack");
+ if (!tcp_rst (tcp))
+ tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
+ error = TCP_ERROR_RCV_WND;
goto drop;
}
- /* Parse options */
- if (tcp_options_parse (tcp0, &tc0->rcv_opts))
+ /* Make sure ACK is valid */
+ if (seq_gt (tc->snd_una, ack))
{
- clib_warning ("options parse fail");
+ error = TCP_ERROR_ACK_INVALID;
goto drop;
}
+ }
- /* Valid SYN or SYN-ACK. Move connection from half-open pool to
- * current thread pool. */
- pool_get (tm->connections[my_thread_index], new_tc0);
- clib_memcpy (new_tc0, tc0, sizeof (*new_tc0));
- new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index];
- new_tc0->c_thread_index = my_thread_index;
- new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
- new_tc0->irs = seq0;
- new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
- new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] =
- TCP_TIMER_HANDLE_INVALID;
- new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-
- /* If this is not the owning thread, wait for syn retransmit to
- * expire and cleanup then */
- if (tcp_half_open_connection_cleanup (tc0))
- tc0->flags |= TCP_CONN_HALF_OPEN_DONE;
-
- if (tcp_opts_tstamp (&new_tc0->rcv_opts))
- {
- new_tc0->tsval_recent = new_tc0->rcv_opts.tsval;
- new_tc0->tsval_recent_age = tcp_time_now ();
- }
+ /*
+ * 2. check the RST bit
+ */
- if (tcp_opts_wscale (&new_tc0->rcv_opts))
- new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
+ if (tcp_rst (tcp))
+ {
+ /* If ACK is acceptable, signal client that peer is not
+ * willing to accept connection and drop connection*/
+ if (tcp_ack (tcp))
+ tcp_rcv_rst (wrk, tc);
+ error = TCP_ERROR_RST_RCVD;
+ goto drop;
+ }
- 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;
+ /*
+ * 3. check the security and precedence (skipped)
+ */
- tcp_connection_init_vars (new_tc0);
+ /*
+ * 4. check the SYN bit
+ */
- /* SYN-ACK: See if we can switch to ESTABLISHED state */
- if (PREDICT_TRUE (tcp_ack (tcp0)))
- {
- /* Our SYN is ACKed: we have iss < ack = snd_una */
+ /* No SYN flag. Drop. */
+ if (!tcp_syn (tcp))
+ {
+ error = TCP_ERROR_SEGMENT_INVALID;
+ goto drop;
+ }
- /* TODO Dequeue acknowledged segments if we support Fast Open */
- new_tc0->snd_una = ack0;
- new_tc0->state = TCP_STATE_ESTABLISHED;
+ /* Parse options */
+ if (tcp_options_parse (tcp, &tc->rcv_opts, 1))
+ {
+ error = TCP_ERROR_OPTIONS;
+ goto drop;
+ }
- /* Make sure las is initialized for the wnd computation */
- new_tc0->rcv_las = new_tc0->rcv_nxt;
+ /* Valid SYN or SYN-ACK. Move connection from half-open pool to
+ * current thread pool. */
+ new_tc = tcp_connection_alloc_w_base (thread_index, tc);
+ new_tc->rcv_nxt = vnet_buffer (b[0])->tcp.seq_end;
+ new_tc->irs = seq;
+ new_tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
+ new_tc->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
- /* Notify app that we have connection. If session layer can't
- * allocate session send reset */
- if (session_stream_connect_notify (&new_tc0->connection, 0))
- {
- clib_warning ("connect notify fail");
- tcp_send_reset_w_pkt (new_tc0, b0, is_ip4);
- tcp_connection_cleanup (new_tc0);
- goto drop;
- }
+ if (tcp_opts_tstamp (&new_tc->rcv_opts))
+ {
+ new_tc->tsval_recent = new_tc->rcv_opts.tsval;
+ new_tc->tsval_recent_age = tcp_time_tstamp (thread_index);
+ }
- /* Make sure after data segment processing ACK is sent */
- new_tc0->flags |= TCP_CONN_SNDACK;
+ if (tcp_opts_wscale (&new_tc->rcv_opts))
+ new_tc->snd_wscale = new_tc->rcv_opts.wscale;
+ else
+ new_tc->rcv_wscale = 0;
- /* Update rtt with the syn-ack sample */
- tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number);
- TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0);
- }
- /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
- else
- {
- new_tc0->state = TCP_STATE_SYN_RCVD;
+ new_tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
+ << new_tc->snd_wscale;
+ new_tc->snd_wl1 = seq;
+ new_tc->snd_wl2 = ack;
- /* 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;
- }
+ tcp_connection_init_vars (new_tc);
- tc0->rtt_ts = 0;
- tcp_init_snd_vars (tc0);
- tcp_make_synack (new_tc0, b0);
- next0 = tcp_next_output (is_ip4);
+ /* SYN-ACK: See if we can switch to ESTABLISHED state */
+ if (PREDICT_TRUE (tcp_ack (tcp)))
+ {
+ /* Our SYN is ACKed: we have iss < ack = snd_una */
- goto drop;
- }
+ /* TODO Dequeue acknowledged segments if we support Fast Open */
+ new_tc->snd_una = ack;
+ new_tc->state = TCP_STATE_ESTABLISHED;
- /* Read data, if any */
- if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len))
- {
- clib_warning ("rcvd data in syn-sent");
- error0 = tcp_segment_rcv (new_tc0, b0, &next0);
- if (error0 == TCP_ERROR_ACK_OK)
- error0 = TCP_ERROR_SYN_ACKS_RCVD;
- tcp_maybe_inc_counter (syn_sent, error0, 1);
- }
- else
+ /* Make sure las is initialized for the wnd computation */
+ new_tc->rcv_las = new_tc->rcv_nxt;
+
+ /* Notify app that we have connection. If session layer can't
+ * allocate session send reset */
+ if (session_stream_connect_notify (&new_tc->connection,
+ SESSION_E_NONE))
{
- tcp_make_ack (new_tc0, b0);
- next0 = tcp_next_output (new_tc0->c_is_ip4);
+ tcp_send_reset_w_pkt (new_tc, b[0], thread_index, is_ip4);
+ tcp_connection_cleanup (new_tc);
+ error = TCP_ERROR_CREATE_SESSION_FAIL;
+ goto cleanup_ho;
}
- drop:
+ transport_fifos_init_ooo (&new_tc->connection);
+ new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
+ /* Update rtt with the syn-ack sample */
+ tcp_estimate_initial_rtt (new_tc);
+ TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc);
+ error = TCP_ERROR_SYN_ACKS_RCVD;
+ }
+ /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
+ else
+ {
+ new_tc->state = TCP_STATE_SYN_RCVD;
- b0->error = error0 ? node->errors[error0] : 0;
- if (PREDICT_FALSE
- ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0))
+ /* Notify app that we have connection */
+ if (session_stream_connect_notify (&new_tc->connection,
+ SESSION_E_NONE))
{
- t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
- clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header));
- clib_memcpy (&t0->tcp_connection, tc0,
- sizeof (t0->tcp_connection));
+ tcp_connection_cleanup (new_tc);
+ tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
+ TCP_EVT (TCP_EVT_RST_SENT, tc);
+ error = TCP_ERROR_CREATE_SESSION_FAIL;
+ goto cleanup_ho;
}
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ transport_fifos_init_ooo (&new_tc->connection);
+ new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
+ new_tc->rtt_ts = 0;
+ tcp_init_snd_vars (new_tc);
+ tcp_send_synack (new_tc);
+ error = TCP_ERROR_SYNS_RCVD;
+ goto cleanup_ho;
+ }
+
+ if (!(new_tc->cfg_flags & TCP_CFG_F_NO_TSO))
+ tcp_check_tx_offload (new_tc, is_ip4);
+
+ /* Read data, if any */
+ if (PREDICT_FALSE (vnet_buffer (b[0])->tcp.data_len))
+ {
+ clib_warning ("rcvd data in syn-sent");
+ error = tcp_segment_rcv (wrk, new_tc, b[0]);
+ if (error == TCP_ERROR_ACK_OK)
+ error = TCP_ERROR_SYN_ACKS_RCVD;
+ }
+ else
+ {
+ /* Send ack now instead of programming it because connection was
+ * just established and it's not optional. */
+ tcp_send_ack (new_tc);
}
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ cleanup_ho:
+
+ /* If this is not the owning thread, wait for syn retransmit to
+ * expire and cleanup then */
+ if (tcp_half_open_connection_cleanup (tc))
+ tc->flags |= TCP_CONN_HALF_OPEN_DONE;
+
+ drop:
+
+ b += 1;
+ n_left_from -= 1;
+ tcp_inc_counter (syn_sent, error, 1);
}
- errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
- my_thread_index);
- tcp_inc_counter (syn_sent, TCP_ERROR_EVENT_FIFO_FULL, errors);
- return from_frame->n_vectors;
+ errors =
+ session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index);
+ tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors);
+ vlib_buffer_free (vm, from, frame->n_vectors);
+ tcp_handle_disconnects (wrk);
+
+ return frame->n_vectors;
}
-static uword
-tcp4_syn_sent (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ );
}
-static uword
-tcp6_syn_sent_rcv (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp4_syn_sent_node) =
{
- .function = tcp4_syn_sent,
.name = "tcp4-syn-sent",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp4_syn_sent_node, tcp4_syn_sent);
-
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp6_syn_sent_node) =
{
- .function = tcp6_syn_sent_rcv,
.name = "tcp6-syn-sent",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv);
+static void
+tcp46_rcv_process_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
+ u32 *from, u32 n_bufs)
+{
+ u32 thread_index = vm->thread_index;
+ tcp_connection_t *tc = 0;
+ tcp_rx_trace_t *t;
+ vlib_buffer_t *b;
+ int i;
-vlib_node_registration_t tcp4_rcv_process_node;
-vlib_node_registration_t tcp6_rcv_process_node;
+ for (i = 0; i < n_bufs; i++)
+ {
+ b = vlib_get_buffer (vm, from[i]);
+ if (!(b->flags & VLIB_BUFFER_IS_TRACED))
+ continue;
+ tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
+ thread_index);
+ t = vlib_add_trace (vm, node, b, sizeof (*t));
+ tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
+ }
+}
/**
* Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
* as per RFC793 p. 64
*/
always_inline uword
-tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip4)
+tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame, int is_ip4)
{
- u32 n_left_from, next_index, *from, *to_next, n_fins = 0;
- u32 my_thread_index = vm->thread_index, errors = 0;
+ u32 thread_index = vm->thread_index, errors, n_left_from, *from, max_deq;
+ tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
+ tcp46_rcv_process_trace_frame (vm, node, from, n_left_from);
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
- next_index = node->cached_next_index;
+ vlib_get_buffers (vm, from, bufs, n_left_from);
+ b = bufs;
while (n_left_from > 0)
{
- u32 n_left_to_next;
+ u32 error = TCP_ERROR_NONE;
+ tcp_header_t *tcp = 0;
+ tcp_connection_t *tc;
+ u8 is_fin;
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- while (n_left_from > 0 && n_left_to_next > 0)
+ tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
+ thread_index);
+ if (PREDICT_FALSE (tc == 0))
{
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_header_t *tcp0 = 0;
- tcp_connection_t *tc0;
- u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_NONE;
- u8 is_fin0;
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
- tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
- my_thread_index);
- if (PREDICT_FALSE (tc0 == 0))
- {
- error0 = TCP_ERROR_INVALID_CONNECTION;
- goto drop;
- }
-
- tcp0 = tcp_buffer_hdr (b0);
- is_fin0 = tcp_is_fin (tcp0);
+ error = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
- /* SYNs, FINs and data consume sequence numbers */
- vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len;
+ tcp = tcp_buffer_hdr (b[0]);
+ is_fin = tcp_is_fin (tcp);
- if (CLIB_DEBUG)
+ if (CLIB_DEBUG)
+ {
+ if (!(tc->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
{
tcp_connection_t *tmp;
- tmp = tcp_lookup_connection (tc0->c_fib_index, b0,
- my_thread_index, is_ip4);
- if (tmp->state != tc0->state)
+ tmp = tcp_lookup_connection (tc->c_fib_index, b[0], thread_index,
+ is_ip4);
+ if (tmp->state != tc->state)
{
- clib_warning ("state changed");
+ if (tc->state != TCP_STATE_CLOSED)
+ clib_warning ("state changed");
goto drop;
}
}
+ }
- /*
- * Special treatment for CLOSED
- */
- if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
- {
- error0 = TCP_ERROR_CONNECTION_CLOSED;
- goto drop;
- }
+ /*
+ * Special treatment for CLOSED
+ */
+ if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED))
+ {
+ error = TCP_ERROR_CONNECTION_CLOSED;
+ goto drop;
+ }
- /*
- * For all other states (except LISTEN)
- */
+ /*
+ * For all other states (except LISTEN)
+ */
+
+ /* 1-4: check SEQ, RST, SYN */
+ if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], tcp, &error)))
+ goto drop;
+
+ /* 5: check the ACK field */
+ switch (tc->state)
+ {
+ case TCP_STATE_SYN_RCVD:
- /* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0,
- &next0, &error0)))
+ /* Make sure the segment is exactly right */
+ if (tc->rcv_nxt != vnet_buffer (b[0])->tcp.seq_number || is_fin)
{
- tcp_maybe_inc_counter (rcv_process, error0, 1);
+ tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
+ error = TCP_ERROR_SEGMENT_INVALID;
goto drop;
}
- /* 5: check the ACK field */
- switch (tc0->state)
- {
- case TCP_STATE_SYN_RCVD:
- /*
- * If the segment acknowledgment is not acceptable, form a
- * reset segment,
- * <SEQ=SEG.ACK><CTL=RST>
- * and send it.
- */
- if (!tcp_rcv_ack_is_acceptable (tc0, b0))
- {
- TCP_DBG ("connection not accepted");
- tcp_send_reset_w_pkt (tc0, b0, is_ip4);
- error0 = TCP_ERROR_ACK_INVALID;
- goto drop;
- }
-
- /* Update rtt and rto */
- tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number);
-
- /* Switch state to ESTABLISHED */
- tc0->state = TCP_STATE_ESTABLISHED;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
-
- /* Initialize session variables */
- tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
- tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
- << tc0->rcv_opts.wscale;
- tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
- tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
-
- /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
- tcp_retransmit_timer_reset (tc0);
- tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
- stream_session_accept_notify (&tc0->connection);
- error0 = TCP_ERROR_ACK_OK;
- break;
- case TCP_STATE_ESTABLISHED:
- /* We can get packets in established state here because they
- * were enqueued before state change */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
-
- break;
- case TCP_STATE_FIN_WAIT_1:
- /* In addition to the processing for the ESTABLISHED state, if
- * our FIN is now acknowledged then enter FIN-WAIT-2 and
- * continue processing in that state. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
-
- /* Still have to send the FIN */
- if (tc0->flags & TCP_CONN_FINPNDG)
- {
- /* TX fifo finally drained */
- if (!session_tx_fifo_max_dequeue (&tc0->connection))
- tcp_send_fin (tc0);
- }
- /* If FIN is ACKed */
- else if (tc0->snd_una == tc0->snd_una_max)
- {
- 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 (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
- break;
- case TCP_STATE_CLOSE_WAIT:
- /* Do the same processing as for the ESTABLISHED state. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
- if (tc0->flags & TCP_CONN_FINPNDG)
- {
- /* TX fifo finally drained */
- if (!session_tx_fifo_max_dequeue (&tc0->connection))
- {
- tcp_send_fin (tc0);
- tcp_connection_timers_reset (tc0);
- tc0->state = TCP_STATE_LAST_ACK;
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE,
- TCP_2MSL_TIME);
- }
- }
- break;
- case TCP_STATE_CLOSING:
- /* In addition to the processing for the ESTABLISHED state, if
- * the ACK acknowledges our FIN then enter the TIME-WAIT state,
- * otherwise ignore the segment. */
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
- {
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- goto drop;
- }
-
- tc0->state = TCP_STATE_TIME_WAIT;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ /*
+ * If the segment acknowledgment is not acceptable, form a
+ * reset segment,
+ * <SEQ=SEG.ACK><CTL=RST>
+ * and send it.
+ */
+ if (tcp_rcv_ack_no_cc (tc, b[0], &error))
+ {
+ tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
+ error = TCP_ERROR_SEGMENT_INVALID;
goto drop;
+ }
- break;
- case TCP_STATE_LAST_ACK:
- /* The only thing that [should] arrive in this state is an
- * acknowledgment of our FIN. If our FIN is now acknowledged,
- * delete the TCB, enter the CLOSED state, and return. */
+ /* Update rtt and rto */
+ tcp_estimate_initial_rtt (tc);
+ tcp_connection_tx_pacer_update (tc);
- if (!tcp_rcv_ack_is_acceptable (tc0, b0))
- {
- error0 = TCP_ERROR_ACK_INVALID;
- goto drop;
- }
- error0 = TCP_ERROR_ACK_OK;
- tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
- /* Apparently our ACK for the peer's FIN was lost */
- if (is_fin0 && tc0->snd_una != tc0->snd_una_max)
- {
- tcp_send_fin (tc0);
- goto drop;
- }
+ /* Switch state to ESTABLISHED */
+ tc->state = TCP_STATE_ESTABLISHED;
+ TCP_EVT (TCP_EVT_STATE_CHANGE, tc);
- tc0->state = TCP_STATE_CLOSED;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ if (!(tc->cfg_flags & TCP_CFG_F_NO_TSO))
+ tcp_check_tx_offload (tc, is_ip4);
- /* 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);
+ /* Initialize session variables */
+ tc->snd_una = vnet_buffer (b[0])->tcp.ack_number;
+ tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
+ << tc->rcv_opts.wscale;
+ tc->snd_wl1 = vnet_buffer (b[0])->tcp.seq_number;
+ tc->snd_wl2 = vnet_buffer (b[0])->tcp.ack_number;
+ /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
+ tcp_retransmit_timer_reset (&wrk->timer_wheel, tc);
+ if (session_stream_accept_notify (&tc->connection))
+ {
+ error = TCP_ERROR_MSG_QUEUE_FULL;
+ tcp_send_reset (tc);
+ session_transport_delete_notify (&tc->connection);
+ tcp_connection_cleanup (tc);
goto drop;
+ }
+ error = 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, tc, b[0], tcp, &error))
+ 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. */
+ 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, tc, b[0], tcp, &error))
+ goto drop;
+
+ /* Still have to send the FIN */
+ if (tc->flags & TCP_CONN_FINPNDG)
+ {
+ /* TX fifo finally drained */
+ max_deq = transport_max_tx_dequeue (&tc->connection);
+ if (max_deq <= tc->burst_acked)
+ tcp_send_fin (tc);
+ /* If a fin was received and data was acked extend wait */
+ else if ((tc->flags & TCP_CONN_FINRCVD) && tc->bytes_acked)
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.closewait_time);
+ }
+ /* If FIN is ACKed */
+ else if (tc->snd_una == tc->snd_nxt)
+ {
+ /* Stop all retransmit timers because we have nothing more
+ * to send. */
+ tcp_connection_timers_reset (tc);
- if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
+ /* We already have a FIN but didn't transition to CLOSING
+ * because of outstanding tx data. Close the connection. */
+ if (tc->flags & TCP_CONN_FINRCVD)
{
- tcp_maybe_inc_counter (rcv_process, error0, 1);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
goto drop;
}
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- goto drop;
-
- break;
- default:
- ASSERT (0);
+ tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_2);
+ /* Enable waitclose because we're willing to wait for peer's
+ * FIN but not indefinitely. */
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.finwait2_time);
+
+ /* Don't try to deq the FIN acked */
+ if (tc->burst_acked > 1)
+ session_tx_fifo_dequeue_drop (&tc->connection,
+ tc->burst_acked - 1);
+ tc->burst_acked = 0;
}
+ 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_no_cc (tc, b[0], &error))
+ goto drop;
+ tc->burst_acked = 0;
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ /* Do the same processing as for the ESTABLISHED state. */
+ if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
+ goto drop;
- /* 6: check the URG bit TODO */
+ if (!(tc->flags & TCP_CONN_FINPNDG))
+ break;
- /* 7: process the segment text */
- switch (tc0->state)
- {
- case TCP_STATE_ESTABLISHED:
- case TCP_STATE_FIN_WAIT_1:
- case TCP_STATE_FIN_WAIT_2:
- if (vnet_buffer (b0)->tcp.data_len)
- {
- error0 = tcp_segment_rcv (tc0, b0, &next0);
- tcp_maybe_inc_counter (rcv_process, error0, 1);
- }
- else if (is_fin0)
- tc0->rcv_nxt += 1;
- break;
- case TCP_STATE_CLOSE_WAIT:
- case TCP_STATE_CLOSING:
- case TCP_STATE_LAST_ACK:
- case TCP_STATE_TIME_WAIT:
- /* This should not occur, since a FIN has been received from the
- * remote side. Ignore the segment text. */
- break;
- }
+ /* Still have outstanding tx data */
+ max_deq = transport_max_tx_dequeue (&tc->connection);
+ if (max_deq > tc->burst_acked)
+ break;
+
+ tcp_send_fin (tc);
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.lastack_time);
+ break;
+ case TCP_STATE_CLOSING:
+ /* In addition to the processing for the ESTABLISHED state, if
+ * the ACK acknowledges our FIN then enter the TIME-WAIT state,
+ * otherwise ignore the segment. */
+ if (tcp_rcv_ack_no_cc (tc, b[0], &error))
+ goto drop;
+
+ if (tc->snd_una != tc->snd_nxt)
+ goto drop;
+
+ tcp_connection_timers_reset (tc);
+ tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.timewait_time);
+ session_transport_closed_notify (&tc->connection);
+ goto drop;
+
+ break;
+ case TCP_STATE_LAST_ACK:
+ /* The only thing that [should] arrive in this state is an
+ * acknowledgment of our FIN. If our FIN is now acknowledged,
+ * delete the TCB, enter the CLOSED state, and return. */
- /* 8: check the FIN bit */
- if (!is_fin0)
+ if (tcp_rcv_ack_no_cc (tc, b[0], &error))
goto drop;
- switch (tc0->state)
+ /* Apparently our ACK for the peer's FIN was lost */
+ if (is_fin && tc->snd_una != tc->snd_nxt)
{
- case TCP_STATE_ESTABLISHED:
- case TCP_STATE_SYN_RCVD:
- /* Send FIN-ACK notify app and enter CLOSE-WAIT */
- tcp_connection_timers_reset (tc0);
- tcp_make_fin (tc0, b0);
- tc0->snd_nxt += 1;
- tc0->snd_una_max = tc0->snd_nxt;
- tcp_retransmit_timer_set (tc0);
- next0 = tcp_next_output (tc0->c_is_ip4);
- stream_session_disconnect_notify (&tc0->connection);
- tc0->state = TCP_STATE_CLOSE_WAIT;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- break;
- case TCP_STATE_CLOSE_WAIT:
- case TCP_STATE_CLOSING:
- case TCP_STATE_LAST_ACK:
- /* move along .. */
- break;
- case TCP_STATE_FIN_WAIT_1:
- tc0->state = TCP_STATE_CLOSING;
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- /* Wait for ACK but not forever */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
- break;
- case TCP_STATE_FIN_WAIT_2:
- /* Got FIN, send ACK! Be more aggressive with resource cleanup */
- tc0->state = TCP_STATE_TIME_WAIT;
- tcp_connection_timers_reset (tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- tcp_make_ack (tc0, b0);
- next0 = tcp_next_output (is_ip4);
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
- break;
- case TCP_STATE_TIME_WAIT:
- /* Remain in the TIME-WAIT state. Restart the time-wait
- * timeout.
- */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
- break;
+ tcp_send_fin (tc);
+ goto drop;
}
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
- n_fins += 1;
- drop:
- b0->error = error0 ? node->errors[error0] : 0;
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ session_transport_closed_notify (&tc->connection);
+
+ /* 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 (tc);
+ tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
+
+ 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. */
+
+ if (tcp_rcv_ack_no_cc (tc, b[0], &error))
+ goto drop;
+
+ if (!is_fin)
+ goto drop;
+
+ tcp_program_ack (tc);
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.timewait_time);
+ goto drop;
+
+ break;
+ default:
+ ASSERT (0);
+ }
+
+ /* 6: check the URG bit TODO */
+
+ /* 7: process the segment text */
+ switch (tc->state)
+ {
+ case TCP_STATE_ESTABLISHED:
+ case TCP_STATE_FIN_WAIT_1:
+ case TCP_STATE_FIN_WAIT_2:
+ if (vnet_buffer (b[0])->tcp.data_len)
+ error = tcp_segment_rcv (wrk, tc, b[0]);
+ /* Don't accept out of order fins lower */
+ if (vnet_buffer (b[0])->tcp.seq_end != tc->rcv_nxt)
+ goto drop;
+ 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;
+ }
+
+ /* 8: check the FIN bit */
+ if (!is_fin)
+ goto drop;
+
+ TCP_EVT (TCP_EVT_FIN_RCVD, tc);
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ switch (tc->state)
+ {
+ case TCP_STATE_ESTABLISHED:
+ /* Account for the FIN and send ack */
+ tc->rcv_nxt += 1;
+ tcp_program_ack (tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
+ tcp_program_disconnect (wrk, tc);
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.closewait_time);
+ break;
+ case TCP_STATE_SYN_RCVD:
+ /* Send FIN-ACK, enter LAST-ACK and because the app was not
+ * notified yet, set a cleanup timer instead of relying on
+ * disconnect notify and the implicit close call. */
+ tcp_connection_timers_reset (tc);
+ tc->rcv_nxt += 1;
+ tcp_send_fin (tc);
+ tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.lastack_time);
+ break;
+ case TCP_STATE_CLOSE_WAIT:
+ case TCP_STATE_CLOSING:
+ case TCP_STATE_LAST_ACK:
+ /* move along .. */
+ break;
+ case TCP_STATE_FIN_WAIT_1:
+ tc->rcv_nxt += 1;
+
+ if (tc->flags & TCP_CONN_FINPNDG)
{
- tcp_rx_trace_t *t0 =
- vlib_add_trace (vm, node, b0, sizeof (*t0));
- tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4);
+ /* If data is outstanding, stay in FIN_WAIT_1 and try to finish
+ * sending it. Since we already received a fin, do not wait
+ * for too long. */
+ tc->flags |= TCP_CONN_FINRCVD;
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.closewait_time);
}
-
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ else
+ {
+ tcp_connection_set_state (tc, TCP_STATE_CLOSING);
+ tcp_program_ack (tc);
+ /* Wait for ACK for our FIN but not forever */
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.closing_time);
+ }
+ break;
+ case TCP_STATE_FIN_WAIT_2:
+ /* Got FIN, send ACK! Be more aggressive with resource cleanup */
+ tc->rcv_nxt += 1;
+ tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
+ tcp_connection_timers_reset (tc);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.timewait_time);
+ tcp_program_ack (tc);
+ session_transport_closed_notify (&tc->connection);
+ break;
+ case TCP_STATE_TIME_WAIT:
+ /* Remain in the TIME-WAIT state. Restart the time-wait
+ * timeout.
+ */
+ tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.timewait_time);
+ break;
}
+ error = TCP_ERROR_FIN_RCVD;
+
+ drop:
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ b += 1;
+ n_left_from -= 1;
+ tcp_inc_counter (rcv_process, error, 1);
}
- errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP,
- my_thread_index);
- tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors);
- tcp_inc_counter (rcv_process, TCP_ERROR_FIN_RCVD, n_fins);
- return from_frame->n_vectors;
+ errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
+ thread_index);
+ tcp_inc_counter (rcv_process, TCP_ERROR_MSG_QUEUE_FULL, errors);
+ tcp_handle_postponed_dequeues (wrk);
+ tcp_handle_disconnects (wrk);
+ vlib_buffer_free (vm, from, frame->n_vectors);
+
+ return frame->n_vectors;
}
-static uword
-tcp4_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
}
-static uword
-tcp6_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp4_rcv_process_node) =
{
- .function = tcp4_rcv_process,
.name = "tcp4-rcv-process",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp4_rcv_process_node, tcp4_rcv_process);
-
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp6_rcv_process_node) =
{
- .function = tcp6_rcv_process,
.name = "tcp6-rcv-process",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp6_rcv_process_node, tcp6_rcv_process);
+static void
+tcp46_listen_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
+ u32 *to_next, u32 n_bufs)
+{
+ tcp_connection_t *tc = 0;
+ tcp_rx_trace_t *t;
+ vlib_buffer_t *b;
+ int i;
-vlib_node_registration_t tcp4_listen_node;
-vlib_node_registration_t tcp6_listen_node;
+ for (i = 0; i < n_bufs; i++)
+ {
+ b = vlib_get_buffer (vm, to_next[i]);
+ if (!(b->flags & VLIB_BUFFER_IS_TRACED))
+ continue;
+ if (vnet_buffer (b)->tcp.flags == TCP_STATE_LISTEN)
+ tc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index);
+ t = vlib_add_trace (vm, node, b, sizeof (*t));
+ tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
+ }
+}
/**
* LISTEN state processing as per RFC 793 p. 65
*/
always_inline uword
-tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip4)
+tcp46_listen_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame, int is_ip4)
{
- u32 n_left_from, next_index, *from, *to_next, n_syns = 0;
- u32 my_thread_index = vm->thread_index;
+ u32 n_left_from, *from, n_syns = 0;
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+ u32 thread_index = vm->thread_index;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
+ if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
+ tcp46_listen_trace_frame (vm, node, from, n_left_from);
- next_index = node->cached_next_index;
+ vlib_get_buffers (vm, from, bufs, n_left_from);
+ b = bufs;
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 error = TCP_ERROR_NONE;
+ tcp_connection_t *lc, *child;
- while (n_left_from > 0 && n_left_to_next > 0)
+ /* Flags initialized with connection state after lookup */
+ if (vnet_buffer (b[0])->tcp.flags == TCP_STATE_LISTEN)
{
- u32 bi0;
- vlib_buffer_t *b0;
- tcp_rx_trace_t *t0;
- tcp_header_t *th0 = 0;
- tcp_connection_t *lc0;
- ip4_header_t *ip40;
- ip6_header_t *ip60;
- tcp_connection_t *child0;
- u32 error0 = TCP_ERROR_NONE, next0 = tcp_next_drop (is_ip4);
-
- bi0 = from[0];
- to_next[0] = bi0;
- from += 1;
- to_next += 1;
- n_left_from -= 1;
- n_left_to_next -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
- lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index);
-
- if (is_ip4)
+ lc = tcp_listener_get (vnet_buffer (b[0])->tcp.connection_index);
+ }
+ else
+ {
+ tcp_connection_t *tc;
+ tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
+ thread_index);
+ if (tc->state != TCP_STATE_TIME_WAIT)
{
- ip40 = vlib_buffer_get_current (b0);
- th0 = ip4_next_header (ip40);
+ error = TCP_ERROR_CREATE_EXISTS;
+ goto done;
}
- else
+ lc = tcp_lookup_listener (b[0], tc->c_fib_index, is_ip4);
+ /* clean up the old session */
+ tcp_connection_del (tc);
+ /* listener was cleaned up */
+ if (!lc)
{
- ip60 = vlib_buffer_get_current (b0);
- th0 = ip6_next_header (ip60);
+ error = TCP_ERROR_NO_LISTENER;
+ goto done;
}
+ }
- /* Create child session. For syn-flood protection use filter */
-
- /* 1. first check for an RST: handled in dispatch */
- /* if (tcp_rst (th0))
- goto drop; */
-
- /* 2. second check for an ACK: handled in dispatch */
- /* if (tcp_ack (th0))
- {
- tcp_send_reset (b0, is_ip4);
- goto drop;
- } */
-
- /* 3. check for a SYN (did that already) */
-
- /* 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;
- }
+ /* Make sure connection wasn't just created */
+ child =
+ tcp_lookup_connection (lc->c_fib_index, b[0], thread_index, is_ip4);
+ if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN))
+ {
+ error = TCP_ERROR_CREATE_EXISTS;
+ goto done;
+ }
- /* 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;
+ /* Create child session. For syn-flood protection use filter */
- 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));
- }
+ /* 1. first check for an RST: handled by input dispatch */
- if (tcp_options_parse (th0, &child0->rcv_opts))
- {
- clib_warning ("options parse fail");
- goto drop;
- }
+ /* 2. second check for an ACK: handled by input dispatch */
- 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];
+ /* 3. check for a SYN (did that already) */
- /* 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 ();
- }
+ /* Create child session and send SYN-ACK */
+ child = tcp_connection_alloc (thread_index);
- if (tcp_opts_wscale (&child0->rcv_opts))
- child0->snd_wscale = child0->rcv_opts.wscale;
+ if (tcp_options_parse (tcp_buffer_hdr (b[0]), &child->rcv_opts, 1))
+ {
+ error = TCP_ERROR_OPTIONS;
+ tcp_connection_free (child);
+ goto done;
+ }
- 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;
+ tcp_init_w_buffer (child, b[0], is_ip4);
- tcp_connection_init_vars (child0);
- TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1);
+ child->state = TCP_STATE_SYN_RCVD;
+ child->c_fib_index = lc->c_fib_index;
+ child->cc_algo = lc->cc_algo;
+ tcp_connection_init_vars (child);
+ child->rto = TCP_RTO_MIN;
- 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;
- }
+ /*
+ * This initializes elog track, must be done before synack.
+ * We also do it before possible tcp_connection_cleanup() as it
+ * generates TCP_EVT_DELETE event.
+ */
+ TCP_EVT (TCP_EVT_SYN_RCVD, child, 1);
- /* Reuse buffer to make syn-ack and send */
- tcp_make_synack (child0, b0);
- next0 = tcp_next_output (is_ip4);
- tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME);
+ if (session_stream_accept (&child->connection, lc->c_s_index,
+ lc->c_thread_index, 0 /* notify */ ))
+ {
+ tcp_connection_cleanup (child);
+ error = TCP_ERROR_CREATE_SESSION_FAIL;
+ goto done;
+ }
- drop:
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
- clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header));
- clib_memcpy (&t0->tcp_connection, lc0,
- sizeof (t0->tcp_connection));
- }
+ transport_fifos_init_ooo (&child->connection);
+ child->tx_fifo_size = transport_tx_fifo_size (&child->connection);
- n_syns += (error0 == TCP_ERROR_NONE);
- b0->error = node->errors[error0];
+ tcp_send_synack (child);
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
- }
+ done:
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ b += 1;
+ n_left_from -= 1;
+ n_syns += (error == TCP_ERROR_NONE);
}
tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns);
- return from_frame->n_vectors;
+ vlib_buffer_free (vm, from, frame->n_vectors);
+
+ return frame->n_vectors;
}
-static uword
-tcp4_listen (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ );
}
-static uword
-tcp6_listen (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp4_listen_node) =
{
- .function = tcp4_listen,
.name = "tcp4-listen",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp4_listen_node, tcp4_listen);
-
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp6_listen_node) =
{
- .function = tcp6_listen,
.name = "tcp6-listen",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp6_listen_node, tcp6_listen);
-
-vlib_node_registration_t tcp4_input_node;
-vlib_node_registration_t tcp6_input_node;
-
typedef enum _tcp_input_next
{
TCP_INPUT_NEXT_DROP,
static void
tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4)
{
- if (*error == TCP_ERROR_FILTERED)
+ if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD)
{
*next = TCP_INPUT_NEXT_DROP;
}
}
}
-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;
-
- 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);
-}
-
static inline void
tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc,
- vlib_buffer_t * b, u16 * next, u32 * error)
+ vlib_buffer_t * b, u16 * next,
+ vlib_node_runtime_t * error_node)
{
tcp_header_t *tcp;
+ u32 error;
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;
+ error = tm->dispatch_table[tc->state][flags].error;
+ tc->segs_in += 1;
- 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;
+ /* Track connection state when packet was received. It helps
+ * @ref tcp46_listen_inline detect port reuse */
+ 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);
+ if (PREDICT_FALSE (error != TCP_ERROR_NONE))
+ {
+ b->error = error_node->errors[error];
+ if (error == TCP_ERROR_DISPATCH)
+ clib_warning ("tcp conn %u disp error state %U flags %U",
+ tc->c_c_index, format_tcp_state, tc->state,
+ format_tcp_flags, (int) flags);
}
}
always_inline uword
tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, int is_ip4)
+ vlib_frame_t * frame, int is_ip4, u8 is_nolookup)
{
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;
- tcp_set_time_now (thread_index);
+ tcp_update_time_now (tcp_get_worker (thread_index));
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next[0] = next[1] = TCP_INPUT_NEXT_DROP;
- tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4);
- tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4);
+ tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
+ is_nolookup);
+ tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4,
+ is_nolookup);
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])));
+ ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
+ ASSERT (tcp_lookup_is_valid (tc1, b[1], 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;
- tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0);
- tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1);
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
+ tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
}
else
{
if (PREDICT_TRUE (tc0 != 0))
{
- ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0])));
+ ASSERT (tcp_lookup_is_valid (tc0, b[0], 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);
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
}
else
- tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
+ {
+ tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
+ b[0]->error = node->errors[error0];
+ }
if (PREDICT_TRUE (tc1 != 0))
{
- ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1])));
+ ASSERT (tcp_lookup_is_valid (tc1, b[1], 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);
+ tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
}
else
- tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
+ {
+ tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
+ b[1]->error = node->errors[error1];
+ }
}
b += 2;
}
next[0] = TCP_INPUT_NEXT_DROP;
- tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4);
+ tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
+ is_nolookup);
if (PREDICT_TRUE (tc0 != 0))
{
- ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0])));
+ ASSERT (tcp_lookup_is_valid (tc0, b[0], 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);
+ tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
}
else
- tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
+ {
+ tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
+ b[0]->error = node->errors[error0];
+ }
b += 1;
next += 1;
return frame->n_vectors;
}
-static uword
-tcp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
+ 1 /* is_nolookup */ );
+}
+
+VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
+ 1 /* is_nolookup */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (tcp4_input_nolookup_node) =
+{
+ .name = "tcp4-input-nolookup",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_errors = TCP_N_ERROR,
+ .error_strings = tcp_error_strings,
+ .n_next_nodes = TCP_INPUT_N_NEXT,
+ .next_nodes =
+ {
+#define _(s,n) [TCP_INPUT_NEXT_##s] = n,
+ foreach_tcp4_input_next
+#undef _
+ },
+ .format_buffer = format_tcp_header,
+ .format_trace = format_tcp_rx_trace,
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (tcp6_input_nolookup_node) =
+{
+ .name = "tcp6-input-nolookup",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_errors = TCP_N_ERROR,
+ .error_strings = tcp_error_strings,
+ .n_next_nodes = TCP_INPUT_N_NEXT,
+ .next_nodes =
+ {
+#define _(s,n) [TCP_INPUT_NEXT_##s] = n,
+ foreach_tcp6_input_next
+#undef _
+ },
+ .format_buffer = format_tcp_header,
+ .format_trace = format_tcp_rx_trace,
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FN (tcp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
- return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ );
+ return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
+ 0 /* is_nolookup */ );
}
-static uword
-tcp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
+VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
{
- return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ );
+ return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
+ 0 /* is_nolookup */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp4_input_node) =
{
- .function = tcp4_input,
.name = "tcp4-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp4_input_node, tcp4_input);
-
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (tcp6_input_node) =
{
- .function = tcp6_input,
.name = "tcp6-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
};
/* *INDENT-ON* */
-VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input);
+#ifndef CLIB_MARCH_VARIANT
+void
+tcp_check_gso (tcp_connection_t *tc)
+{
+ tcp_check_tx_offload (tc, tc->c_is_ip4);
+}
static void
tcp_dispatch_table_init (tcp_main_t * tm)
tm->dispatch_table[TCP_STATE_##t][f].error = (e); \
} while (0)
- /* SYNs for new connections -> tcp-listen. */
+ /* RFC 793: In LISTEN if RST drop and if ACK return RST */
+ _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID);
+ _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION);
_(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_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
+ TCP_ERROR_ACK_INVALID);
+ _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_INVALID_CONNECTION);
+ _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID);
_(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
- TCP_ERROR_NONE);
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_SEGMENT_INVALID);
+ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
/* 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_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN, 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_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
/* SYN-ACK for a SYN */
_(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
TCP_ERROR_NONE);
_(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
_(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
TCP_ERROR_NONE);
+ _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
+ _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
+ TCP_ERROR_NONE);
/* ACK for for established connection -> tcp-established. */
_(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
/* FIN for for established connection -> tcp-established. */
_(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
_(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
+ TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED,
+ TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
+ TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | 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);
+ _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
+ TCP_ERROR_NONE);
+ _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
+ _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
/* 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, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
_(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
_(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
_(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | 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);
+ _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(FIN_WAIT_2, TCP_FLAG_SYN, 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);
+ _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(CLOSE_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
_(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_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | 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_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
_(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
+ TCP_ERROR_NONE);
+ _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
+ TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, 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_RST | TCP_FLAG_ACK, 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);
+ /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An
+ * incoming segment not containing a RST causes a RST to be sent in
+ * response.*/
_(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
- _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
+ TCP_ERROR_CONNECTION_CLOSED);
+ _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
+ _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
+ _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
TCP_ERROR_CONNECTION_CLOSED);
#undef _
}
VLIB_INIT_FUNCTION (tcp_input_init);
+#endif /* CLIB_MARCH_VARIANT */
+
/*
* fd.io coding-style-patch-verification: ON
*
Code Review / vpp.git / blobdiff