X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_input.c;h=9c303eb01a5fb58f31fedc4a2338853914b3e607;hb=7ac053b27fee8f9e437cf7b61357943356381061;hp=67af4321bd32404c8f304fec116476475b3d3743;hpb=e69f4954a9de40a47f0bc27cdab0ba44e6985dac;p=vpp.git diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index 67af4321bd3..9c303eb01a5 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -27,7 +27,8 @@ static char *tcp_error_strings[] = { /* All TCP nodes have the same outgoing arcs */ #define foreach_tcp_state_next \ - _ (DROP, "error-drop") \ + _ (DROP4, "ip4-drop") \ + _ (DROP6, "ip6-drop") \ _ (TCP4_OUTPUT, "tcp4-output") \ _ (TCP6_OUTPUT, "tcp6-output") @@ -75,6 +76,9 @@ typedef enum _tcp_state_next #define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \ : TCP_NEXT_TCP6_OUTPUT) +#define tcp_next_drop(is_ip4) (is_ip4 ? TCP_NEXT_DROP4 \ + : TCP_NEXT_DROP6) + vlib_node_registration_t tcp4_established_node; vlib_node_registration_t tcp6_established_node; @@ -95,16 +99,31 @@ vlib_node_registration_t tcp6_established_node; * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the * peer's reference when computing our receive window. * - * This accepts only segments within the window. + * This: + * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) + * however, is too strict when we have retransmits. Instead we just check that + * the seq is not beyond the right edge and that the end of the segment is not + * less than the left edge. + * + * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so + * use rcv_nxt in the right edge window test instead of rcv_las. + * */ always_inline u8 tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) { - return seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) - && seq_geq (seq, tc->rcv_nxt); + return (seq_geq (end_seq, tc->rcv_las) + && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); } -void +/** + * Parse TCP header options. + * + * @param th TCP header + * @param to TCP options data structure to be populated + * @return -1 if parsing failed + */ +static int tcp_options_parse (tcp_header_t * th, tcp_options_t * to) { const u8 *data; @@ -116,7 +135,8 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) data = (const u8 *) (th + 1); /* Zero out all flags but those set in SYN */ - to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE); + to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE + | TCP_OPTS_FLAG_SACK); for (; opts_len > 0; opts_len -= opt_len, data += opt_len) { @@ -126,17 +146,20 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) if (kind == TCP_OPTION_EOL) break; else if (kind == TCP_OPTION_NOOP) - opt_len = 1; + { + opt_len = 1; + continue; + } else { /* broken options */ if (opts_len < 2) - break; + return -1; opt_len = data[1]; /* weird option length */ if (opt_len < 2 || opt_len > opts_len) - break; + return -1; } /* Parse options */ @@ -188,8 +211,8 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) vec_reset_length (to->sacks); for (j = 0; j < to->n_sack_blocks; j++) { - b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 4 * j)); - b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 4 * j)); + b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j)); + b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j)); vec_add1 (to->sacks, b); } break; @@ -198,15 +221,45 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to) continue; } } + return 0; } +/** + * RFC1323: Check against wrapped sequence numbers (PAWS). If we have + * timestamp to echo and it's less than tsval_recent, drop segment + * but still send an ACK in order to retain TCP's mechanism for detecting + * and recovering from half-open connections + * + * Or at least that's what the theory says. It seems that this might not work + * very well with packet reordering and fast retransmit. XXX + */ always_inline int tcp_segment_check_paws (tcp_connection_t * tc) { - /* XXX normally test for timestamp should be lt instead of leq, but for - * local testing this is not enough */ - return tcp_opts_tstamp (&tc->opt) && tc->tsval_recent - && timestamp_lt (tc->opt.tsval, tc->tsval_recent); + return tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent + && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); +} + +/** + * Update tsval recent + */ +always_inline void +tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) +{ + /* + * RFC1323: If Last.ACK.sent falls within the range of sequence numbers + * of an incoming segment: + * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN + * then the TSval from the segment is copied to TS.Recent; + * otherwise, the TSval is ignored. + */ + if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) + && seq_leq (tc->rcv_las, seq_end)) + { + ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); + tc->tsval_recent = tc->rcv_opts.tsval; + tc->tsval_recent_age = tcp_time_now_w_thread (tc->c_thread_index); + } } /** @@ -219,82 +272,113 @@ tcp_segment_check_paws (tcp_connection_t * tc) * @return 0 if segments passes validation. */ static int -tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0, - vlib_buffer_t * b0, tcp_header_t * th0, u32 * next0) +tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, + vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0) { - u8 paws_failed; + /* We could get a burst of RSTs interleaved with acks */ + if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) + { + tcp_send_reset (tc0); + *error0 = TCP_ERROR_CONNECTION_CLOSED; + goto error; + } if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) - return -1; + { + *error0 = TCP_ERROR_SEGMENT_INVALID; + goto error; + } - tcp_options_parse (th0, &tc0->opt); + if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts))) + { + clib_warning ("options parse error"); + *error0 = TCP_ERROR_OPTIONS; + goto error; + } - /* RFC1323: Check against wrapped sequence numbers (PAWS). If we have - * timestamp to echo and it's less than tsval_recent, drop segment - * but still send an ACK in order to retain TCP's mechanism for detecting - * and recovering from half-open connections */ - paws_failed = tcp_segment_check_paws (tc0); - if (paws_failed) + if (PREDICT_FALSE (tcp_segment_check_paws (tc0))) { - clib_warning ("paws failed"); + *error0 = TCP_ERROR_PAWS; + if (CLIB_DEBUG > 2) + clib_warning ("paws failed\n%U", format_tcp_connection, tc0, 2); + TCP_EVT_DBG (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, + vnet_buffer (b0)->tcp.seq_end); /* If it just so happens that a segment updates tsval_recent for a * segment over 24 days old, invalidate tsval_recent. */ if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, - tcp_time_now ())) + tcp_time_now_w_thread (tc0->c_thread_index))) { /* Age isn't reset until we get a valid tsval (bsd inspired) */ tc0->tsval_recent = 0; + clib_warning ("paws failed - really old segment. REALLY?"); } else { /* Drop after ack if not rst */ if (!tcp_rst (th0)) { - tcp_make_ack (tc0, b0); - *next0 = tcp_next_output (tc0->c_is_ip4); - return -1; + tcp_program_ack (wrk, tc0); + TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); } } + goto error; } /* 1st: check sequence number */ if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, vnet_buffer (b0)->tcp.seq_end)) { - if (!tcp_rst (th0)) + *error0 = TCP_ERROR_RCV_WND; + /* If our window is 0 and the packet is in sequence, let it pass + * through for ack processing. It should be dropped later. */ + if (!(tc0->rcv_wnd == 0 + && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)) { - /* Send dup ack */ - tcp_make_ack (tc0, b0); - *next0 = tcp_next_output (tc0->c_is_ip4); + /* If not RST, send dup ack */ + if (!tcp_rst (th0)) + { + tcp_program_dupack (wrk, tc0); + TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); + } + goto error; } - return -1; } /* 2nd: check the RST bit */ - if (tcp_rst (th0)) + if (PREDICT_FALSE (tcp_rst (th0))) { tcp_connection_reset (tc0); - return -1; + *error0 = TCP_ERROR_RST_RCVD; + goto error; } /* 3rd: check security and precedence (skip) */ /* 4th: check the SYN bit */ - if (tcp_syn (th0)) - { - tcp_send_reset (b0, tc0->c_is_ip4); - return -1; - } - - /* If PAWS passed and segment in window, save timestamp */ - if (!paws_failed) + if (PREDICT_FALSE (tcp_syn (th0))) { - tc0->tsval_recent = tc0->opt.tsval; - tc0->tsval_recent_age = tcp_time_now (); + /* TODO implement RFC 5961 */ + if (tc0->state == TCP_STATE_SYN_RCVD) + { + tcp_send_synack (tc0); + TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); + } + else + { + tcp_program_ack (wrk, tc0); + TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0); + } + goto error; } + /* If segment in window, save timestamp */ + tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, + vnet_buffer (b0)->tcp.seq_end); return 0; + +error: + return -1; } always_inline int @@ -317,31 +401,42 @@ tcp_rcv_ack_is_acceptable (tcp_connection_t * tc0, vlib_buffer_t * tb0) static void tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) { - int err; + int err, diff; if (tc->srtt != 0) { err = mrtt - tc->srtt; - tc->srtt += err >> 3; /* XXX Drop in RTT results in RTTVAR increase and bigger RTO. * The increase should be bound */ - tc->rttvar += (clib_abs (err) - tc->rttvar) >> 2; + tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); + diff = (clib_abs (err) - (int) tc->rttvar) >> 2; + tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); } else { /* First measurement. */ tc->srtt = mrtt; - tc->rttvar = mrtt << 1; + tc->rttvar = mrtt >> 1; } } -/** Update RTT estimate and RTO timer +void +tcp_update_rto (tcp_connection_t * tc) +{ + tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX); + tc->rto = clib_max (tc->rto, TCP_RTO_MIN); +} + +/** + * Update RTT estimate and RTO timer * * Measure RTT: We have two sources of RTT measurements: TSOPT and ACK * timing. Middle boxes are known to fiddle with TCP options so we * should give higher priority to ACK timing. * + * This should be called only if previously sent bytes have been acked. + * * return 1 if valid rtt 0 otherwise */ static int @@ -351,60 +446,171 @@ tcp_update_rtt (tcp_connection_t * tc, u32 ack) /* Karn's rule, part 1. Don't use retransmitted segments to estimate * RTT because they're ambiguous. */ - if (tc->rtt_seq && seq_gt (ack, tc->rtt_seq) && !tc->rto_boff) + if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) { - mrtt = tcp_time_now () - tc->rtt_ts; - tc->rtt_seq = 0; + if (tcp_in_recovery (tc)) + return 0; + goto done; } + if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) + { + tc->mrtt_us = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts; + mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1); + } /* As per RFC7323 TSecr can be used for RTTM only if the segment advances * snd_una, i.e., the left side of the send window: - * seq_lt (tc->snd_una, ack). Note: last condition could be dropped, we don't - * try to update rtt for dupacks */ - else if (tcp_opts_tstamp (&tc->opt) && tc->opt.tsecr && tc->bytes_acked) + * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ + else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) { - mrtt = tcp_time_now () - tc->opt.tsecr; + u32 now = tcp_time_now_w_thread (tc->c_thread_index); + mrtt = clib_max (now - tc->rcv_opts.tsecr, 1); } /* Ignore dubious measurements */ if (mrtt == 0 || mrtt > TCP_RTT_MAX) - return 0; + goto done; tcp_estimate_rtt (tc, mrtt); - tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX); +done: - return 1; + /* Allow measuring of a new RTT */ + tc->rtt_ts = 0; + + /* If we got here something must've been ACKed so make sure boff is 0, + * even if mrtt is not valid since we update the rto lower */ + tc->rto_boff = 0; + tcp_update_rto (tc); + + return 0; } /** - * Dequeue bytes that have been acked and while at it update RTT estimates. + * Dequeue bytes for connections that have received acks in last burst */ static void -tcp_dequeue_acked (tcp_connection_t * tc, u32 ack) +tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) { - /* Dequeue the newly ACKed bytes */ - stream_session_dequeue_drop (&tc->connection, tc->bytes_acked); + u32 thread_index = wrk->vm->thread_index; + u32 *pending_deq_acked; + tcp_connection_t *tc; + int i; - /* Update rtt and rto */ - if (tcp_update_rtt (tc, ack)) + if (!vec_len (wrk->pending_deq_acked)) + return; + + pending_deq_acked = wrk->pending_deq_acked; + for (i = 0; i < vec_len (pending_deq_acked); i++) { - /* Good ACK received and valid RTT, make sure retransmit backoff is 0 */ - tc->rto_boff = 0; + tc = tcp_connection_get (pending_deq_acked[i], thread_index); + tc->flags &= ~TCP_CONN_DEQ_PENDING; + + /* Dequeue the newly ACKed bytes */ + stream_session_dequeue_drop (&tc->connection, tc->burst_acked); + tc->burst_acked = 0; + tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); + + /* If everything has been acked, stop retransmit timer + * otherwise update. */ + tcp_retransmit_timer_update (tc); } + _vec_len (wrk->pending_deq_acked) = 0; } -/** Check if dupack as per RFC5681 Sec. 2 */ -always_inline u8 -tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 new_snd_wnd) +static void +tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!(tc->flags & TCP_CONN_DEQ_PENDING)) + { + vec_add1 (wrk->pending_deq_acked, tc->c_c_index); + tc->flags |= TCP_CONN_DEQ_PENDING; + } + tc->burst_acked += tc->bytes_acked + tc->sack_sb.snd_una_adv; +} + +/** + * Check if duplicate ack as per RFC5681 Sec. 2 + */ +static u8 +tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, + u32 prev_snd_una) { - return ((vnet_buffer (b)->tcp.ack_number == tc->snd_una) + return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) && seq_gt (tc->snd_una_max, tc->snd_una) && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) - && (new_snd_wnd == tc->snd_wnd)); + && (prev_snd_wnd == tc->snd_wnd)); } -void +/** + * Checks if ack is a congestion control event. + */ +static u8 +tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, + u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) +{ + /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are + * defined to be 'duplicate' */ + *is_dack = tc->sack_sb.last_sacked_bytes + || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); + + return ((*is_dack || tcp_in_cong_recovery (tc)) && !tcp_is_lost_fin (tc)); +} + +static u32 +scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) +{ + ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes)); + return hole - sb->holes; +} + +static u32 +scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) +{ + return hole->end - hole->start; +} + +sack_scoreboard_hole_t * +scoreboard_get_hole (sack_scoreboard_t * sb, u32 index) +{ + if (index != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, index); + return 0; +} + +sack_scoreboard_hole_t * +scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) +{ + if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, hole->next); + return 0; +} + +sack_scoreboard_hole_t * +scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) +{ + if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, hole->prev); + return 0; +} + +sack_scoreboard_hole_t * +scoreboard_first_hole (sack_scoreboard_t * sb) +{ + if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, sb->head); + return 0; +} + +sack_scoreboard_hole_t * +scoreboard_last_hole (sack_scoreboard_t * sb) +{ + if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, sb->tail); + return 0; +} + +static void scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) { sack_scoreboard_hole_t *next, *prev; @@ -414,6 +620,10 @@ scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) 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) { @@ -425,30 +635,40 @@ scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) sb->head = hole->next; } + if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole) + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; + + /* Poison the entry */ + if (CLIB_DEBUG > 0) + clib_memset (hole, 0xfe, sizeof (*hole)); + pool_put (sb->holes, hole); } -sack_scoreboard_hole_t * -scoreboard_insert_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * prev, +static sack_scoreboard_hole_t * +scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index, u32 start, u32 end) { - sack_scoreboard_hole_t *hole, *next; + sack_scoreboard_hole_t *hole, *next, *prev; u32 hole_index; pool_get (sb->holes, hole); - memset (hole, 0, sizeof (*hole)); + clib_memset (hole, 0, sizeof (*hole)); hole->start = start; hole->end = end; - hole_index = hole - sb->holes; + hole_index = scoreboard_hole_index (sb, hole); + prev = scoreboard_get_hole (sb, prev_index); if (prev) { - hole->prev = prev - sb->holes; + hole->prev = prev_index; hole->next = prev->next; if ((next = scoreboard_next_hole (sb, hole))) next->prev = hole_index; + else + sb->tail = hole_index; prev->next = hole_index; } @@ -463,61 +683,261 @@ scoreboard_insert_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * prev, } static void +scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb) +{ + sack_scoreboard_hole_t *left, *right; + u32 bytes = 0, blks = 0; + + sb->lost_bytes = 0; + sb->sacked_bytes = 0; + left = scoreboard_last_hole (sb); + if (!left) + return; + + if (seq_gt (sb->high_sacked, left->end)) + { + bytes = sb->high_sacked - left->end; + blks = 1; + } + + while ((right = left) + && bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss + && blks < TCP_DUPACK_THRESHOLD + /* left not updated if above conditions fail */ + && (left = scoreboard_prev_hole (sb, right))) + { + bytes += right->start - left->end; + blks++; + } + + /* left is first lost */ + if (left) + { + do + { + sb->lost_bytes += scoreboard_hole_bytes (right); + left->is_lost = 1; + left = scoreboard_prev_hole (sb, right); + if (left) + bytes += right->start - left->end; + } + while ((right = left)); + } + + sb->sacked_bytes = bytes; +} + +/** + * Figure out the next hole to retransmit + * + * Follows logic proposed in RFC6675 Sec. 4, NextSeg() + */ +sack_scoreboard_hole_t * +scoreboard_next_rxt_hole (sack_scoreboard_t * sb, + sack_scoreboard_hole_t * start, + u8 have_unsent, u8 * can_rescue, u8 * snd_limited) +{ + sack_scoreboard_hole_t *hole = 0; + + hole = start ? start : scoreboard_first_hole (sb); + while (hole && seq_leq (hole->end, sb->high_rxt) && hole->is_lost) + hole = scoreboard_next_hole (sb, hole); + + /* Nothing, return */ + if (!hole) + { + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; + return 0; + } + + /* Rule (1): if higher than rxt, less than high_sacked and lost */ + if (hole->is_lost && seq_lt (hole->start, sb->high_sacked)) + { + sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); + } + else + { + /* Rule (2): available unsent data */ + if (have_unsent) + { + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; + return 0; + } + /* Rule (3): if hole not lost */ + else if (seq_lt (hole->start, sb->high_sacked)) + { + *snd_limited = 0; + sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); + } + /* Rule (4): if hole beyond high_sacked */ + else + { + ASSERT (seq_geq (hole->start, sb->high_sacked)); + *snd_limited = 1; + *can_rescue = 1; + /* HighRxt MUST NOT be updated */ + return 0; + } + } + + if (hole && seq_lt (sb->high_rxt, hole->start)) + sb->high_rxt = hole->start; + + return hole; +} + +static void +scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 snd_una) +{ + sack_scoreboard_hole_t *hole; + hole = scoreboard_first_hole (sb); + if (hole) + { + snd_una = seq_gt (snd_una, hole->start) ? snd_una : hole->start; + sb->cur_rxt_hole = sb->head; + } + sb->high_rxt = snd_una; + sb->rescue_rxt = snd_una - 1; +} + +void +scoreboard_init (sack_scoreboard_t * sb) +{ + sb->head = TCP_INVALID_SACK_HOLE_INDEX; + sb->tail = TCP_INVALID_SACK_HOLE_INDEX; + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; +} + +void +scoreboard_clear (sack_scoreboard_t * sb) +{ + sack_scoreboard_hole_t *hole; + while ((hole = scoreboard_first_hole (sb))) + { + scoreboard_remove_hole (sb, hole); + } + ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX); + ASSERT (pool_elts (sb->holes) == 0); + sb->sacked_bytes = 0; + sb->last_sacked_bytes = 0; + sb->last_bytes_delivered = 0; + sb->snd_una_adv = 0; + sb->high_sacked = 0; + sb->high_rxt = 0; + sb->lost_bytes = 0; + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; +} + +/** + * Test that scoreboard is sane after recovery + * + * Returns 1 if scoreboard is empty or if first hole beyond + * snd_una. + */ +static u8 +tcp_scoreboard_is_sane_post_recovery (tcp_connection_t * tc) +{ + sack_scoreboard_hole_t *hole; + hole = scoreboard_first_hole (&tc->sack_sb); + return (!hole || (seq_geq (hole->start, tc->snd_una) + && seq_lt (hole->end, tc->snd_una_max))); +} + +void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) { sack_scoreboard_t *sb = &tc->sack_sb; sack_block_t *blk, tmp; - sack_scoreboard_hole_t *hole, *next_hole; - u32 blk_index = 0; + sack_scoreboard_hole_t *hole, *next_hole, *last_hole; + u32 blk_index = 0, old_sacked_bytes, hole_index; int i, j; - if (!tcp_opts_sack (tc) && sb->head == TCP_INVALID_SACK_HOLE_INDEX) + sb->last_sacked_bytes = 0; + sb->last_bytes_delivered = 0; + sb->snd_una_adv = 0; + + if (!tcp_opts_sack (&tc->rcv_opts) + && sb->head == TCP_INVALID_SACK_HOLE_INDEX) return; - /* Remove invalid blocks */ - vec_foreach (blk, tc->opt.sacks) - { - if (seq_lt (blk->start, blk->end) - && seq_gt (blk->start, tc->snd_una) - && seq_gt (blk->start, ack) && seq_lt (blk->end, tc->snd_nxt)) - continue; + old_sacked_bytes = sb->sacked_bytes; - vec_del1 (tc->opt.sacks, blk - tc->opt.sacks); - } + /* Remove invalid blocks */ + blk = tc->rcv_opts.sacks; + while (blk < vec_end (tc->rcv_opts.sacks)) + { + if (seq_lt (blk->start, blk->end) + && seq_gt (blk->start, tc->snd_una) + && seq_gt (blk->start, ack) && seq_leq (blk->end, tc->snd_una_max)) + { + blk++; + continue; + } + vec_del1 (tc->rcv_opts.sacks, blk - tc->rcv_opts.sacks); + } /* Add block for cumulative ack */ if (seq_gt (ack, tc->snd_una)) { tmp.start = tc->snd_una; tmp.end = ack; - vec_add1 (tc->opt.sacks, tmp); + vec_add1 (tc->rcv_opts.sacks, tmp); } - if (vec_len (tc->opt.sacks) == 0) + if (vec_len (tc->rcv_opts.sacks) == 0) return; + tcp_scoreboard_trace_add (tc, ack); + /* Make sure blocks are ordered */ - for (i = 0; i < vec_len (tc->opt.sacks); i++) - for (j = i; j < vec_len (tc->opt.sacks); j++) - if (seq_lt (tc->opt.sacks[j].start, tc->opt.sacks[i].start)) + for (i = 0; i < vec_len (tc->rcv_opts.sacks); i++) + for (j = i + 1; j < vec_len (tc->rcv_opts.sacks); j++) + if (seq_lt (tc->rcv_opts.sacks[j].start, tc->rcv_opts.sacks[i].start)) { - tmp = tc->opt.sacks[i]; - tc->opt.sacks[i] = tc->opt.sacks[j]; - tc->opt.sacks[j] = tmp; + tmp = tc->rcv_opts.sacks[i]; + tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j]; + tc->rcv_opts.sacks[j] = tmp; } - /* If no holes, insert the first that covers all outstanding bytes */ if (sb->head == TCP_INVALID_SACK_HOLE_INDEX) { - scoreboard_insert_hole (sb, 0, tc->snd_una, tc->snd_una_max); + /* If no holes, insert the first that covers all outstanding bytes */ + last_hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, + tc->snd_una, tc->snd_una_max); + sb->tail = scoreboard_hole_index (sb, last_hole); + tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; + sb->high_sacked = tmp.end; + } + else + { + /* If we have holes but snd_una_max is beyond the last hole, update + * last hole end */ + tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; + last_hole = scoreboard_last_hole (sb); + if (seq_gt (tc->snd_una_max, last_hole->end)) + { + if (seq_geq (last_hole->start, sb->high_sacked)) + { + last_hole->end = tc->snd_una_max; + } + /* New hole after high sacked block */ + else if (seq_lt (sb->high_sacked, tc->snd_una_max)) + { + scoreboard_insert_hole (sb, sb->tail, sb->high_sacked, + tc->snd_una_max); + } + } + /* Keep track of max byte sacked for when the last hole + * is acked */ + if (seq_gt (tmp.end, sb->high_sacked)) + sb->high_sacked = tmp.end; } /* Walk the holes with the SACK blocks */ hole = pool_elt_at_index (sb->holes, sb->head); - while (hole && blk_index < vec_len (tc->opt.sacks)) + while (hole && blk_index < vec_len (tc->rcv_opts.sacks)) { - blk = &tc->opt.sacks[blk_index]; - + blk = &tc->rcv_opts.sacks[blk_index]; if (seq_leq (blk->start, hole->start)) { /* Block covers hole. Remove hole */ @@ -525,223 +945,640 @@ tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) { next_hole = scoreboard_next_hole (sb, hole); - /* Byte accounting */ - if (seq_lt (hole->end, ack)) + /* Byte accounting: snd_una needs to be advanced */ + if (blk->end == ack) { - /* Bytes lost because snd wnd left edge advances */ - if (seq_lt (next_hole->start, ack)) - sb->sacked_bytes -= next_hole->start - hole->end; + if (next_hole) + { + if (seq_lt (ack, next_hole->start)) + sb->snd_una_adv = next_hole->start - ack; + sb->last_bytes_delivered += + next_hole->start - hole->end; + } else - sb->sacked_bytes -= ack - hole->end; - } - else - { - sb->sacked_bytes += scoreboard_hole_bytes (hole); + { + ASSERT (seq_geq (sb->high_sacked, ack)); + sb->snd_una_adv = sb->high_sacked - ack; + sb->last_bytes_delivered += sb->high_sacked - hole->end; + } } scoreboard_remove_hole (sb, hole); hole = next_hole; } - /* Partial overlap */ + /* Partial 'head' overlap */ else { - sb->sacked_bytes += blk->end - hole->start; - hole->start = blk->end; + if (seq_gt (blk->end, hole->start)) + { + hole->start = blk->end; + } blk_index++; } } else { /* Hole must be split */ - if (seq_leq (blk->end, hole->end)) + if (seq_lt (blk->end, hole->end)) { - sb->sacked_bytes += blk->end - blk->start; - scoreboard_insert_hole (sb, hole, blk->end, hole->end); - hole->end = blk->start - 1; + hole_index = scoreboard_hole_index (sb, hole); + next_hole = scoreboard_insert_hole (sb, hole_index, blk->end, + hole->end); + + /* Pool might've moved */ + hole = scoreboard_get_hole (sb, hole_index); + hole->end = blk->start; blk_index++; + ASSERT (hole->next == scoreboard_hole_index (sb, next_hole)); } - else + else if (seq_lt (blk->start, hole->end)) { - sb->sacked_bytes += hole->end - blk->start + 1; - hole->end = blk->start - 1; - hole = scoreboard_next_hole (sb, hole); + hole->end = blk->start; } + hole = scoreboard_next_hole (sb, hole); } } + + if (pool_elts (sb->holes) == 1) + { + hole = scoreboard_first_hole (sb); + if (hole->start == ack + sb->snd_una_adv + && hole->end == tc->snd_una_max) + scoreboard_remove_hole (sb, hole); + } + + scoreboard_update_bytes (tc, sb); + sb->last_sacked_bytes = sb->sacked_bytes + - (old_sacked_bytes - sb->last_bytes_delivered); + ASSERT (sb->last_sacked_bytes <= sb->sacked_bytes || tcp_in_recovery (tc)); + ASSERT (sb->sacked_bytes == 0 || tcp_in_recovery (tc) + || sb->sacked_bytes < tc->snd_una_max - seq_max (tc->snd_una, ack)); + ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_una_max + - seq_max (tc->snd_una, ack) || tcp_in_recovery (tc)); + ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc) + || sb->holes[sb->head].start == ack + sb->snd_una_adv); + TCP_EVT_DBG (TCP_EVT_CC_SCOREBOARD, tc); } -/** Update snd_wnd +/** + * Try to update snd_wnd based on feedback received from peer. * - * If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set - * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */ + * If successful, and new window is 'effectively' 0, activate persist + * timer. + */ static void tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) { - if (tc->snd_wl1 < seq || (tc->snd_wl1 == seq && tc->snd_wl2 <= ack)) + /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set + * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */ + if (seq_lt (tc->snd_wl1, seq) + || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) { tc->snd_wnd = snd_wnd; tc->snd_wl1 = seq; tc->snd_wl2 = ack; + TCP_EVT_DBG (TCP_EVT_SND_WND, tc); + + if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) + { + /* Set persist timer if not set and we just got 0 wnd */ + if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) + && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) + tcp_persist_timer_set (tc); + } + else + { + tcp_persist_timer_reset (tc); + if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0)) + { + tc->rto_boff = 0; + tcp_update_rto (tc); + } + } } } -static void -tcp_cc_congestion (tcp_connection_t * tc) +/** + * Init loss recovery/fast recovery. + * + * Triggered by dup acks as opposed to timer timeout. Note that cwnd is + * updated in @ref tcp_cc_handle_event after fast retransmit + */ +void +tcp_cc_init_congestion (tcp_connection_t * tc) { + tcp_fastrecovery_on (tc); + tc->snd_congestion = tc->snd_una_max; + tc->cwnd_acc_bytes = 0; + tc->snd_rxt_bytes = 0; + tc->prev_ssthresh = tc->ssthresh; + tc->prev_cwnd = tc->cwnd; tc->cc_algo->congestion (tc); + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4); } static void -tcp_cc_recover (tcp_connection_t * tc) +tcp_cc_recovery_exit (tcp_connection_t * tc) { - if (tcp_in_fastrecovery (tc)) - { - tc->cc_algo->recovered (tc); - tcp_recovery_off (tc); - } - else if (tcp_in_recovery (tc)) - { - tcp_recovery_off (tc); - tc->cwnd = tcp_loss_wnd (tc); - } + tc->rto_boff = 0; + tcp_update_rto (tc); + tc->snd_rxt_ts = 0; + tc->snd_nxt = tc->snd_una_max; + tcp_recovery_off (tc); + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); } -static void -tcp_cc_rcv_ack (tcp_connection_t * tc) +void +tcp_cc_fastrecovery_exit (tcp_connection_t * tc) { - u8 partial_ack; + tc->cc_algo->recovered (tc); + tc->snd_rxt_bytes = 0; + tc->rcv_dupacks = 0; + tc->snd_nxt = tc->snd_una_max; + tc->snd_rxt_bytes = 0; - if (tcp_in_recovery (tc)) - { - partial_ack = seq_lt (tc->snd_una, tc->snd_una_max); - if (!partial_ack) - { - /* Clear retransmitted bytes. */ - tc->rtx_bytes = 0; - tcp_cc_recover (tc); - } - else - { - /* Clear retransmitted bytes. XXX should we clear all? */ - tc->rtx_bytes = 0; - tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK); + tcp_fastrecovery_off (tc); + tcp_fastrecovery_1_smss_off (tc); + tcp_fastrecovery_first_off (tc); - /* Retransmit first unacked segment */ - tcp_retransmit_first_unacked (tc); - } - } - else - { - tc->cc_algo->rcv_ack (tc); - } + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); +} +static void +tcp_cc_congestion_undo (tcp_connection_t * tc) +{ + tc->cwnd = tc->prev_cwnd; + tc->ssthresh = tc->prev_ssthresh; + tc->snd_nxt = tc->snd_una_max; tc->rcv_dupacks = 0; - tc->tsecr_last_ack = tc->opt.tsecr; + if (tcp_in_recovery (tc)) + tcp_cc_recovery_exit (tc); + else if (tcp_in_fastrecovery (tc)) + tcp_cc_fastrecovery_exit (tc); + ASSERT (tc->rto_boff == 0); + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5); +} + +static inline u8 +tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) +{ + return (tcp_in_recovery (tc) && tc->rto_boff == 1 + && tc->snd_rxt_ts + && tcp_opts_tstamp (&tc->rcv_opts) + && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); +} + +static inline u8 +tcp_cc_is_spurious_fast_rxt (tcp_connection_t * tc) +{ + return (tcp_in_fastrecovery (tc) + && tc->cwnd > tc->ssthresh + 3 * tc->snd_mss); +} + +static u8 +tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) +{ + return (tcp_cc_is_spurious_timeout_rxt (tc) + || tcp_cc_is_spurious_fast_rxt (tc)); +} + +static int +tcp_cc_recover (tcp_connection_t * tc) +{ + ASSERT (tcp_in_cong_recovery (tc)); + if (tcp_cc_is_spurious_retransmit (tc)) + { + tcp_cc_congestion_undo (tc); + return 1; + } + + if (tcp_in_recovery (tc)) + tcp_cc_recovery_exit (tc); + else if (tcp_in_fastrecovery (tc)) + tcp_cc_fastrecovery_exit (tc); + + ASSERT (tc->rto_boff == 0); + ASSERT (!tcp_in_cong_recovery (tc)); + ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); + return 0; +} + +static void +tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b) +{ + ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); + + /* Congestion avoidance */ + tcp_cc_rcv_ack (tc); + + /* If a cumulative ack, make sure dupacks is 0 */ + tc->rcv_dupacks = 0; + + /* When dupacks hits the threshold we only enter fast retransmit if + * cumulative ack covers more than snd_congestion. Should snd_una + * wrap this test may fail under otherwise valid circumstances. + * Therefore, proactively update snd_congestion when wrap detected. */ + if (PREDICT_FALSE + (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked) + && seq_gt (tc->snd_congestion, tc->snd_una))) + tc->snd_congestion = tc->snd_una - 1; +} + +static u8 +tcp_should_fastrecover_sack (tcp_connection_t * tc) +{ + return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes; +} + +static u8 +tcp_should_fastrecover (tcp_connection_t * tc) +{ + return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD + || tcp_should_fastrecover_sack (tc)); +} + +void +tcp_program_fastretransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!(tc->flags & TCP_CONN_FRXT_PENDING)) + { + vec_add1 (wrk->pending_fast_rxt, tc->c_c_index); + tc->flags |= TCP_CONN_FRXT_PENDING; + } +} + +void +tcp_do_fastretransmits (tcp_worker_ctx_t * wrk) +{ + u32 *ongoing_fast_rxt, burst_bytes, sent_bytes, thread_index; + u32 max_burst_size, burst_size, n_segs = 0, n_segs_now; + tcp_connection_t *tc; + u64 last_cpu_time; + int i; + + if (vec_len (wrk->pending_fast_rxt) == 0 + && vec_len (wrk->postponed_fast_rxt) == 0) + return; + + thread_index = wrk->vm->thread_index; + last_cpu_time = wrk->vm->clib_time.last_cpu_time; + ongoing_fast_rxt = wrk->ongoing_fast_rxt; + vec_append (ongoing_fast_rxt, wrk->postponed_fast_rxt); + vec_append (ongoing_fast_rxt, wrk->pending_fast_rxt); + + _vec_len (wrk->postponed_fast_rxt) = 0; + _vec_len (wrk->pending_fast_rxt) = 0; + + max_burst_size = VLIB_FRAME_SIZE / vec_len (ongoing_fast_rxt); + max_burst_size = clib_max (max_burst_size, 1); + + for (i = 0; i < vec_len (ongoing_fast_rxt); i++) + { + if (n_segs >= VLIB_FRAME_SIZE) + { + vec_add1 (wrk->postponed_fast_rxt, ongoing_fast_rxt[i]); + continue; + } + + tc = tcp_connection_get (ongoing_fast_rxt[i], thread_index); + tc->flags &= ~TCP_CONN_FRXT_PENDING; + + if (!tcp_in_fastrecovery (tc)) + continue; + + burst_size = clib_min (max_burst_size, VLIB_FRAME_SIZE - n_segs); + burst_bytes = transport_connection_tx_pacer_burst (&tc->connection, + last_cpu_time); + burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); + if (!burst_size) + { + tcp_program_fastretransmit (wrk, tc); + continue; + } + + n_segs_now = tcp_fast_retransmit (wrk, tc, burst_size); + sent_bytes = clib_min (n_segs_now * tc->snd_mss, burst_bytes); + transport_connection_tx_pacer_update_bytes (&tc->connection, + sent_bytes); + n_segs += n_segs_now; + } + _vec_len (ongoing_fast_rxt) = 0; + wrk->ongoing_fast_rxt = ongoing_fast_rxt; } +/** + * One function to rule them all ... and in the darkness bind them + */ static void -tcp_cc_rcv_dupack (tcp_connection_t * tc, u32 ack) +tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack) { - ASSERT (tc->snd_una == ack); + u32 rxt_delivered; - tc->rcv_dupacks++; - if (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) + if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts)) { - /* RFC6582 NewReno heuristic to avoid multiple fast retransmits */ - if (tc->opt.tsecr != tc->tsecr_last_ack) + if (tc->bytes_acked) + goto partial_ack; + tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc); + return; + } + /* + * Duplicate ACK. Check if we should enter fast recovery, or if already in + * it account for the bytes that left the network. + */ + else if (is_dack && !tcp_in_recovery (tc)) + { + TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1); + ASSERT (tc->snd_una != tc->snd_una_max + || tc->sack_sb.last_sacked_bytes); + + tc->rcv_dupacks++; + + /* Pure duplicate ack. If some data got acked, it's handled lower */ + if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked) + { + ASSERT (tcp_in_fastrecovery (tc)); + tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); + return; + } + else if (tcp_should_fastrecover (tc)) + { + u32 pacer_wnd; + + ASSERT (!tcp_in_fastrecovery (tc)); + + /* Heuristic to catch potential late dupacks + * after fast retransmit exits */ + if (is_dack && tc->snd_una == tc->snd_congestion + && timestamp_leq (tc->rcv_opts.tsecr, tc->tsecr_last_ack)) + { + tc->rcv_dupacks = 0; + return; + } + + tcp_cc_init_congestion (tc); + tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); + + if (tcp_opts_sack_permitted (&tc->rcv_opts)) + { + tc->cwnd = tc->ssthresh; + scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una); + } + else + { + /* Post retransmit update cwnd to ssthresh and account for the + * three segments that have left the network and should've been + * buffered at the receiver XXX */ + tc->cwnd = tc->ssthresh + 3 * tc->snd_mss; + } + + /* Constrain rate until we get a partial ack */ + pacer_wnd = clib_max (0.1 * tc->cwnd, 2 * tc->snd_mss); + tcp_connection_tx_pacer_reset (tc, pacer_wnd, + 0 /* start bucket */ ); + tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), + tc); + return; + } + else if (!tc->bytes_acked + || (tc->bytes_acked && !tcp_in_cong_recovery (tc))) + { + tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); + return; + } + else + goto partial_ack; + } + /* Don't allow entry in fast recovery if still in recovery, for now */ + else if (0 && is_dack && tcp_in_recovery (tc)) + { + /* If of of the two conditions lower hold, reset dupacks because + * we're probably after timeout (RFC6582 heuristics). + * If Cumulative ack does not cover more than congestion threshold, + * and: + * 1) The following doesn't hold: The congestion window is greater + * than SMSS bytes and the difference between highest_ack + * and prev_highest_ack is at most 4*SMSS bytes + * 2) Echoed timestamp in the last non-dup ack does not equal the + * stored timestamp + */ + if (seq_leq (tc->snd_una, tc->snd_congestion) + && ((!(tc->cwnd > tc->snd_mss + && tc->bytes_acked <= 4 * tc->snd_mss)) + || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) { tc->rcv_dupacks = 0; return; } + } - tcp_fastrecovery_on (tc); + if (!tc->bytes_acked) + return; + +partial_ack: + TCP_EVT_DBG (TCP_EVT_CC_PACK, tc); - /* Handle congestion and dupack */ - tcp_cc_congestion (tc); - tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); + /* + * Legitimate ACK. 1) See if we can exit recovery + */ - tcp_fast_retransmit (tc); + if (seq_geq (tc->snd_una, tc->snd_congestion)) + { + tcp_retransmit_timer_update (tc); - /* Post retransmit update cwnd to ssthresh and account for the - * three segments that have left the network and should've been - * buffered at the receiver */ - tc->cwnd = tc->ssthresh + TCP_DUPACK_THRESHOLD * tc->snd_mss; + /* If spurious return, we've already updated everything */ + if (tcp_cc_recover (tc)) + { + tc->tsecr_last_ack = tc->rcv_opts.tsecr; + return; + } + + tc->snd_nxt = tc->snd_una_max; + + /* Treat as congestion avoidance ack */ + tcp_cc_rcv_ack (tc); + return; } - else if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD) + + /* + * Legitimate ACK. 2) If PARTIAL ACK try to retransmit + */ + + /* Update the pacing rate. For the first partial ack we move from + * the artificially constrained rate to the one after congestion */ + tcp_connection_tx_pacer_update (tc); + + /* XXX limit this only to first partial ack? */ + tcp_retransmit_timer_force_update (tc); + + /* RFC6675: If the incoming ACK is a cumulative acknowledgment, + * reset dupacks to 0. Also needed if in congestion recovery */ + tc->rcv_dupacks = 0; + + /* Post RTO timeout don't try anything fancy */ + if (tcp_in_recovery (tc)) + { + tcp_cc_rcv_ack (tc); + transport_add_tx_event (&tc->connection); + return; + } + + /* Remove retransmitted bytes that have been delivered */ + if (tcp_opts_sack_permitted (&tc->rcv_opts)) { - ASSERT (tcp_in_fastrecovery (tc)); + ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv + >= tc->sack_sb.last_bytes_delivered + || (tc->flags & TCP_CONN_FINSNT)); - tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); + /* If we have sacks and we haven't gotten an ack beyond high_rxt, + * remove sacked bytes delivered */ + if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt)) + { + rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv + - tc->sack_sb.last_bytes_delivered; + ASSERT (tc->snd_rxt_bytes >= rxt_delivered); + tc->snd_rxt_bytes -= rxt_delivered; + } + else + { + /* Apparently all retransmitted holes have been acked */ + tc->snd_rxt_bytes = 0; + tc->sack_sb.high_rxt = tc->snd_una; + } + } + else + { + tcp_fastrecovery_first_on (tc); + /* Reuse last bytes delivered to track total bytes acked */ + tc->sack_sb.last_bytes_delivered += tc->bytes_acked; + if (tc->snd_rxt_bytes > tc->bytes_acked) + tc->snd_rxt_bytes -= tc->bytes_acked; + else + tc->snd_rxt_bytes = 0; } -} -void -tcp_cc_init (tcp_connection_t * tc) -{ - tc->cc_algo = tcp_cc_algo_get (TCP_CC_NEWRENO); - tc->cc_algo->init (tc); + tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK); + + /* + * Since this was a partial ack, try to retransmit some more data + */ + tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc); } +/** + * Process incoming ACK + */ static int -tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b, - tcp_header_t * th, u32 * next, u32 * error) +tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, + tcp_header_t * th, u32 * error) { - u32 new_snd_wnd; + u32 prev_snd_wnd, prev_snd_una; + u8 is_dack; + + TCP_EVT_DBG (TCP_EVT_CC_STAT, tc); - /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) then send an - * ACK, drop the segment, and return */ - if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)) + /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ + if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt))) { - tcp_make_ack (tc, b); - *next = tcp_next_output (tc->c_is_ip4); - *error = TCP_ERROR_ACK_INVALID; - return -1; + /* When we entered recovery, we reset snd_nxt to snd_una. Seems peer + * still has the data so accept the ack */ + if (tcp_in_recovery (tc) + && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_congestion)) + { + tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; + if (seq_gt (tc->snd_nxt, tc->snd_una_max)) + tc->snd_una_max = tc->snd_nxt; + goto process_ack; + } + + /* If we have outstanding data and this is within the window, accept it, + * probably retransmit has timed out. Otherwise ACK segment and then + * drop it */ + if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)) + { + tcp_program_ack (wrk, tc); + *error = TCP_ERROR_ACK_FUTURE; + TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0, + vnet_buffer (b)->tcp.ack_number); + return -1; + } + + TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 2, + vnet_buffer (b)->tcp.ack_number); + + tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; } - /* If old ACK, discard */ - if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)) + /* If old ACK, probably it's an old dupack */ + if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))) { *error = TCP_ERROR_ACK_OLD; - return -1; + TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 1, + vnet_buffer (b)->tcp.ack_number); + if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) + tcp_cc_handle_event (tc, 1); + /* Don't drop yet */ + return 0; } - if (tcp_opts_sack_permitted (&tc->opt)) + /* + * Looks okay, process feedback + */ +process_ack: + if (tcp_opts_sack_permitted (&tc->rcv_opts)) tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); - new_snd_wnd = clib_net_to_host_u16 (th->window) << tc->snd_wscale; + prev_snd_wnd = tc->snd_wnd; + prev_snd_una = tc->snd_una; + tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, + vnet_buffer (b)->tcp.ack_number, + clib_net_to_host_u16 (th->window) << tc->snd_wscale); + tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; + tc->snd_una = vnet_buffer (b)->tcp.ack_number + tc->sack_sb.snd_una_adv; + tcp_validate_txf_size (tc, tc->bytes_acked); - if (tcp_ack_is_dupack (tc, b, new_snd_wnd)) + if (tc->bytes_acked) { - tcp_cc_rcv_dupack (tc, vnet_buffer (b)->tcp.ack_number); - *error = TCP_ERROR_ACK_DUP; - return -1; + tcp_program_dequeue (wrk, tc); + tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number); } - /* Valid ACK */ - tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; - tc->snd_una = vnet_buffer (b)->tcp.ack_number; - - /* Dequeue ACKed packet and update RTT */ - tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number); - - tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, - vnet_buffer (b)->tcp.ack_number, new_snd_wnd); - - /* Updates congestion control (slow start/congestion avoidance) */ - tcp_cc_rcv_ack (tc); - TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc); - /* If everything has been acked, stop retransmit timer - * otherwise update */ - if (tc->snd_una == tc->snd_una_max) - tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT); - else - tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, tc->rto); + /* + * Check if we have congestion event + */ + if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack)) + { + tcp_cc_handle_event (tc, is_dack); + if (!tcp_in_cong_recovery (tc)) + return 0; + *error = TCP_ERROR_ACK_DUP; + if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th)) + return 0; + return -1; + } + + /* + * Update congestion control (slow start/congestion avoidance) + */ + tcp_cc_update (tc, b); + *error = TCP_ERROR_ACK_OK; return 0; } +static u8 +tcp_sack_vector_is_sane (sack_block_t * sacks) +{ + int i; + for (i = 1; i < vec_len (sacks); i++) + { + if (sacks[i - 1].end == sacks[i].start) + return 0; + } + return 1; +} + /** * Build SACK list as per RFC2018. * @@ -753,369 +1590,508 @@ tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b, * @param start Start sequence number of the newest SACK block * @param end End sequence of the newest SACK block */ -static void +void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end) { - sack_block_t *new_list = 0, block; - u32 n_elts; + sack_block_t *new_list = 0, *block = 0; int i; - u8 new_head = 0; /* If the first segment is ooo add it to the list. Last write might've moved * rcv_nxt over the first segment. */ if (seq_lt (tc->rcv_nxt, start)) { - block.start = start; - block.end = end; - vec_add1 (new_list, block); - new_head = 1; + vec_add2 (new_list, block, 1); + block->start = start; + block->end = end; } /* Find the blocks still worth keeping. */ for (i = 0; i < vec_len (tc->snd_sacks); i++) { - /* Discard if: - * 1) rcv_nxt advanced beyond current block OR - * 2) Segment overlapped by the first segment, i.e., it has been merged - * into it.*/ - if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt) - || seq_leq (tc->snd_sacks[i].start, end)) + /* Discard if rcv_nxt advanced beyond current block */ + if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)) continue; - /* Save subsequent segments to new SACK list. */ - n_elts = clib_min (vec_len (tc->snd_sacks) - i, - TCP_MAX_SACK_BLOCKS - new_head); - vec_insert_elts (new_list, &tc->snd_sacks[i], n_elts, new_head); - break; + /* Merge or drop if segment overlapped by the new segment */ + if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start) + && seq_leq (tc->snd_sacks[i].start, new_list[0].end))) + { + if (seq_lt (tc->snd_sacks[i].start, new_list[0].start)) + new_list[0].start = tc->snd_sacks[i].start; + if (seq_lt (new_list[0].end, tc->snd_sacks[i].end)) + new_list[0].end = tc->snd_sacks[i].end; + continue; + } + + /* Save to new SACK list if we have space. */ + if (vec_len (new_list) < TCP_MAX_SACK_BLOCKS) + { + vec_add1 (new_list, tc->snd_sacks[i]); + } + else + { + clib_warning ("sack discarded"); + } } + ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS); + /* Replace old vector with new one */ vec_free (tc->snd_sacks); tc->snd_sacks = new_list; + + /* Segments should not 'touch' */ + ASSERT (tcp_sack_vector_is_sane (tc->snd_sacks)); +} + +u32 +tcp_sack_list_bytes (tcp_connection_t * tc) +{ + u32 bytes = 0, i; + for (i = 0; i < vec_len (tc->snd_sacks); i++) + bytes += tc->snd_sacks[i].end - tc->snd_sacks[i].start; + return bytes; } /** Enqueue data for delivery to application */ -always_inline u32 +static int tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, u16 data_len) { - int written; + int written, error = TCP_ERROR_ENQUEUED; - /* Pure ACK. Update rcv_nxt and be done. */ - if (PREDICT_FALSE (data_len == 0)) - { - tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end; - return TCP_ERROR_PURE_ACK; - } + ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); + ASSERT (data_len); + written = session_enqueue_stream_connection (&tc->connection, b, 0, + 1 /* queue event */ , 1); - written = stream_session_enqueue_data (&tc->connection, - vlib_buffer_get_current (b), - data_len, 1 /* queue event */ ); + TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written); /* Update rcv_nxt */ if (PREDICT_TRUE (written == data_len)) { - tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end; + tc->rcv_nxt += written; } /* If more data written than expected, account for out-of-order bytes. */ else if (written > data_len) { - tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end + written - data_len; - - /* Send ACK confirming the update */ - tc->flags |= TCP_CONN_SNDACK; - - /* Update SACK list if need be */ - if (tcp_opts_sack_permitted (&tc->opt)) - { - /* Remove SACK blocks that have been delivered */ - tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); - } + tc->rcv_nxt += written; + TCP_EVT_DBG (TCP_EVT_CC_INPUT, tc, data_len, written); + } + else if (written > 0) + { + /* We've written something but FIFO is probably full now */ + tc->rcv_nxt += written; + error = TCP_ERROR_PARTIALLY_ENQUEUED; } else { - ASSERT (0); return TCP_ERROR_FIFO_FULL; } - return TCP_ERROR_ENQUEUED; + /* Update SACK list if need be */ + if (tcp_opts_sack_permitted (&tc->rcv_opts)) + { + /* Remove SACK blocks that have been delivered */ + tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); + } + + return error; } /** Enqueue out-of-order data */ -always_inline u32 +static int tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, u16 data_len) { stream_session_t *s0; - u32 offset, seq; + int rv, offset; - s0 = stream_session_get (tc->c_s_index, tc->c_thread_index); - seq = vnet_buffer (b)->tcp.seq_number; - offset = seq - tc->rcv_nxt; + ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); + ASSERT (data_len); - if (svm_fifo_enqueue_with_offset (s0->server_rx_fifo, s0->pid, offset, - data_len, vlib_buffer_get_current (b))) - return TCP_ERROR_FIFO_FULL; + /* Enqueue out-of-order data with relative offset */ + rv = session_enqueue_stream_connection (&tc->connection, b, + vnet_buffer (b)->tcp.seq_number - + tc->rcv_nxt, 0 /* queue event */ , + 0); + + /* Nothing written */ + if (rv) + { + TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0); + return TCP_ERROR_FIFO_FULL; + } + + TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, data_len); /* Update SACK list if in use */ - if (tcp_opts_sack_permitted (&tc->opt)) + if (tcp_opts_sack_permitted (&tc->rcv_opts)) { ooo_segment_t *newest; u32 start, end; + s0 = session_get (tc->c_s_index, tc->c_thread_index); + /* Get the newest segment from the fifo */ newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo); - start = tc->rcv_nxt + ooo_segment_offset (s0->server_rx_fifo, newest); - end = tc->rcv_nxt + ooo_segment_end_offset (s0->server_rx_fifo, newest); - - tcp_update_sack_list (tc, start, end); + if (newest) + { + offset = ooo_segment_offset (s0->server_rx_fifo, newest); + ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); + start = tc->rcv_nxt + offset; + end = start + ooo_segment_length (s0->server_rx_fifo, newest); + tcp_update_sack_list (tc, start, end); + svm_fifo_newest_ooo_segment_reset (s0->server_rx_fifo); + TCP_EVT_DBG (TCP_EVT_CC_SACKS, tc); + } } - return TCP_ERROR_ENQUEUED; + return TCP_ERROR_ENQUEUED_OOO; } /** - * Check if ACK could be delayed. DELACK timer is set only after frame is - * processed so this can return true for a full bursts of packets. + * Check if ACK could be delayed. If ack can be delayed, it should return + * true for a full frame. If we're always acking return 0. */ always_inline int tcp_can_delack (tcp_connection_t * tc) { - /* If there's no DELACK timer set and the last window sent wasn't 0 we - * can safely delay. */ - if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK) - && (tc->flags & TCP_CONN_SENT_RCV_WND0) == 0 - && (tc->flags & TCP_CONN_SNDACK) == 0) - return 1; + /* Send ack if ... */ + if (TCP_ALWAYS_ACK + /* just sent a rcv wnd 0 */ + || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0 + /* constrained to send ack */ + || (tc->flags & TCP_CONN_SNDACK) != 0 + /* we're almost out of tx wnd */ + || tcp_available_cc_snd_space (tc) < 4 * tc->snd_mss) + return 0; + + return 1; +} +static int +tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) +{ + u32 discard, first = b->current_length; + vlib_main_t *vm = vlib_get_main (); + + /* Handle multi-buffer segments */ + if (n_bytes_to_drop > b->current_length) + { + if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) + return -1; + do + { + discard = clib_min (n_bytes_to_drop, b->current_length); + vlib_buffer_advance (b, discard); + b = vlib_get_buffer (vm, b->next_buffer); + n_bytes_to_drop -= discard; + } + while (n_bytes_to_drop); + if (n_bytes_to_drop > first) + b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; + } + else + vlib_buffer_advance (b, n_bytes_to_drop); + vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; return 0; } +/** + * Receive buffer for connection and handle acks + * + * It handles both in order or out-of-order data. + */ static int -tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b, - u16 n_data_bytes, u32 * next0) +tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, + vlib_buffer_t * b) { - u32 error = 0; + u32 error, n_bytes_to_drop, n_data_bytes; + + vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); + n_data_bytes = vnet_buffer (b)->tcp.data_len; + ASSERT (n_data_bytes); /* Handle out-of-order data */ if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) { - error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); - - /* Don't send more than 3 dupacks per burst - * XXX decide if this is good */ - if (tc->snt_dupacks < 3) + /* Old sequence numbers allowed through because they overlapped + * the rx window */ + if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) { - /* RFC2581: Send DUPACK for fast retransmit */ - tcp_make_ack (tc, b); - *next0 = tcp_next_output (tc->c_is_ip4); - - /* Mark as DUPACK. We may filter these in output if - * the burst fills the holes. */ - vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK; + /* Completely in the past (possible retransmit). Ack + * retransmissions since we may not have any data to send */ + if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) + { + tcp_program_ack (wrk, tc); + error = TCP_ERROR_SEGMENT_OLD; + goto done; + } - tc->snt_dupacks++; + /* Chop off the bytes in the past and see if what is left + * can be enqueued in order */ + n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; + n_data_bytes -= n_bytes_to_drop; + vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; + if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) + { + error = TCP_ERROR_SEGMENT_OLD; + goto done; + } + goto in_order; } + /* RFC2581: Enqueue and send DUPACK for fast retransmit */ + error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); + tcp_program_dupack (wrk, tc); + TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp); goto done; } +in_order: + /* In order data, enqueue. Fifo figures out by itself if any out-of-order * segments can be enqueued after fifo tail offset changes. */ error = tcp_session_enqueue_data (tc, b, n_data_bytes); - - TCP_EVT_DBG (TCP_EVT_INPUT, tc, n_data_bytes); - - /* Check if ACK can be delayed */ if (tcp_can_delack (tc)) { - /* Nothing to do for pure ACKs */ - if (n_data_bytes == 0) - goto done; - - /* If connection has not been previously marked for delay ack - * add it to the list and flag it */ - if (!tc->flags & TCP_CONN_DELACK) - { - vec_add1 (tm->delack_connections[tc->c_thread_index], - tc->c_c_index); - tc->flags |= TCP_CONN_DELACK; - } + if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)) + tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME); + goto done; } - else - { - /* Check if a packet has already been enqueued to output for burst. - * If yes, then drop this one, otherwise, let it pass through to - * output */ - if ((tc->flags & TCP_CONN_BURSTACK) == 0) - { - *next0 = tcp_next_output (tc->c_is_ip4); - tcp_make_ack (tc, b); - error = TCP_ERROR_ENQUEUED; - /* TODO: maybe add counter to ensure N acks will be sent/burst */ - tc->flags |= TCP_CONN_BURSTACK; - } - } + tcp_program_ack (wrk, tc); done: return error; } -void -delack_timers_init (tcp_main_t * tm, u32 thread_index) +typedef struct { - tcp_connection_t *tc; - u32 i, *conns; - tw_timer_wheel_16t_2w_512sl_t *tw; + tcp_header_t tcp_header; + tcp_connection_t tcp_connection; +} tcp_rx_trace_t; - tw = &tm->timer_wheels[thread_index]; - conns = tm->delack_connections[thread_index]; - for (i = 0; i < vec_len (conns); i++) - { - tc = pool_elt_at_index (tm->connections[thread_index], conns[i]); - ASSERT (0 != tc); +static u8 * +format_tcp_rx_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); + u32 indent = format_get_indent (s); - tc->timers[TCP_TIMER_DELACK] - = tw_timer_start_16t_2w_512sl (tw, conns[i], - TCP_TIMER_DELACK, TCP_DELACK_TIME); - } - vec_reset_length (tm->delack_connections[thread_index]); + s = format (s, "%U\n%U%U", + format_tcp_header, &t->tcp_header, 128, + format_white_space, indent, + format_tcp_connection, &t->tcp_connection, 1); + + return s; } -always_inline uword -tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame, int is_ip4) +static u8 * +format_tcp_rx_trace_short (u8 * s, va_list * args) { - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->cpu_index, errors = 0; - tcp_main_t *tm = vnet_get_tcp_main (); + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); - from = vlib_frame_vector_args (from_frame); - n_left_from = from_frame->n_vectors; + s = format (s, "%d -> %d (%U)", + clib_net_to_host_u16 (t->tcp_header.dst_port), + clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state, + t->tcp_connection.state); - next_index = node->cached_next_index; + return s; +} - while (n_left_from > 0) +static void +tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, + tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) +{ + if (tc0) { - u32 n_left_to_next; + clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection)); + } + else + { + th0 = tcp_buffer_hdr (b0); + } + clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); +} - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); +static void +tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, u8 is_ip4) +{ + u32 *from, n_left; - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - tcp_header_t *th0 = 0; - tcp_connection_t *tc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - u32 n_advance_bytes0, n_data_bytes0; - u32 next0 = TCP_ESTABLISHED_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; + n_left = frame->n_vectors; + from = vlib_frame_vector_args (frame); + + while (n_left >= 1) + { + tcp_connection_t *tc0; + tcp_rx_trace_t *t0; + tcp_header_t *th0; + vlib_buffer_t *b0; + u32 bi0; - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); - b0 = vlib_get_buffer (vm, bi0); + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, - my_thread_index); + vm->thread_index); + th0 = tcp_buffer_hdr (b0); + tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); + } - if (PREDICT_FALSE (tc0 == 0)) - { - error0 = TCP_ERROR_INVALID_CONNECTION; - goto drop; - } + from += 1; + n_left -= 1; + } +} - /* Checksum computed by ipx_local no need to compute again */ +always_inline void +tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node, + u8 is_ip4, u32 evt, u32 val) +{ + if (is_ip4) + vlib_node_increment_counter (vm, tcp4_node, evt, val); + else + vlib_node_increment_counter (vm, tcp6_node, evt, val); +} - if (is_ip4) - { - ip40 = vlib_buffer_get_current (b0); - th0 = ip4_next_header (ip40); - n_advance_bytes0 = (ip4_header_bytes (ip40) - + tcp_header_bytes (th0)); - n_data_bytes0 = clib_net_to_host_u16 (ip40->length) - - n_advance_bytes0; - } - else - { - ip60 = vlib_buffer_get_current (b0); - th0 = ip6_next_header (ip60); - n_advance_bytes0 = tcp_header_bytes (th0); - n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length) - - n_advance_bytes0; - n_advance_bytes0 += sizeof (ip60[0]); - } +#define tcp_maybe_inc_counter(node_id, err, count) \ +{ \ + if (next0 != tcp_next_drop (is_ip4)) \ + tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ + tcp6_##node_id##_node.index, is_ip4, err, \ + 1); \ +} +#define tcp_inc_counter(node_id, err, count) \ + tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ + tcp6_##node_id##_node.index, is_ip4, \ + err, count) +#define tcp_maybe_inc_err_counter(cnts, err) \ +{ \ + cnts[err] += (next0 != tcp_next_drop (is_ip4)); \ +} +#define tcp_inc_err_counter(cnts, err, val) \ +{ \ + cnts[err] += val; \ +} +#define tcp_store_err_counters(node_id, cnts) \ +{ \ + int i; \ + for (i = 0; i < TCP_N_ERROR; i++) \ + if (cnts[i]) \ + tcp_inc_counter(node_id, i, cnts[i]); \ +} - /* SYNs, FINs and data consume sequence numbers */ - vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number - + tcp_is_syn (th0) + tcp_is_fin (th0) + n_data_bytes0; - /* TODO header prediction fast path */ +always_inline uword +tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, int is_ip4) +{ + u32 thread_index = vm->thread_index, errors = 0; + tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); + u32 n_left_from, *from, *first_buffer; + u16 err_counters[TCP_N_ERROR] = { 0 }; + u8 is_fin = 0; - /* 1-4: check SEQ, RST, SYN */ - if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0))) - { - error0 = TCP_ERROR_SEGMENT_INVALID; - goto drop; - } + if (node->flags & VLIB_NODE_FLAG_TRACE) + tcp_established_trace_frame (vm, node, frame, is_ip4); - /* 5: check the ACK field */ - if (tcp_rcv_ack (tc0, b0, th0, &next0, &error0)) - { - goto drop; - } + first_buffer = from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; - /* 6: check the URG bit TODO */ + while (n_left_from > 0) + { + u32 bi0, error0 = TCP_ERROR_ACK_OK; + vlib_buffer_t *b0; + tcp_header_t *th0 = 0; + tcp_connection_t *tc0; - /* 7: process the segment text */ - vlib_buffer_advance (b0, n_advance_bytes0); - error0 = tcp_segment_rcv (tm, tc0, b0, n_data_bytes0, &next0); + if (n_left_from > 1) + { + vlib_buffer_t *pb; + pb = vlib_get_buffer (vm, from[1]); + vlib_prefetch_buffer_header (pb, LOAD); + CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); + } - /* 8: check the FIN bit */ - if (tcp_fin (th0)) - { - /* Enter CLOSE-WAIT and notify session. Don't send ACK, instead - * wait for session to call close. To avoid lingering - * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ - tc0->state = TCP_STATE_CLOSE_WAIT; - TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); - stream_session_disconnect_notify (&tc0->connection); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); - } + bi0 = from[0]; + from += 1; + n_left_from -= 1; - drop: - b0->error = node->errors[error0]; - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { + b0 = vlib_get_buffer (vm, bi0); + tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, + thread_index); - } + if (PREDICT_FALSE (tc0 == 0)) + { + error0 = TCP_ERROR_INVALID_CONNECTION; + goto done; + } + + th0 = tcp_buffer_hdr (b0); + /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a + * dangling reference. */ + is_fin = tcp_is_fin (th0); + + /* SYNs, FINs and data consume sequence numbers */ + vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number + + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len; - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + /* TODO header prediction fast path */ + + /* 1-4: check SEQ, RST, SYN */ + if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, th0, &error0))) + { + TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp); + goto done; } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } + /* 5: check the ACK field */ + if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0))) + goto done; - errors = session_manager_flush_enqueue_events (my_thread_index); - if (errors) - { - if (is_ip4) - vlib_node_increment_counter (vm, tcp4_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); - else - vlib_node_increment_counter (vm, tcp6_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); + /* 6: check the URG bit TODO */ + + /* 7: process the segment text */ + if (vnet_buffer (b0)->tcp.data_len) + error0 = tcp_segment_rcv (wrk, tc0, b0); + + /* 8: check the FIN bit */ + if (PREDICT_FALSE (is_fin)) + { + /* Enter CLOSE-WAIT and notify session. To avoid lingering + * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ + /* Account for the FIN if nothing else was received */ + if (vnet_buffer (b0)->tcp.data_len == 0) + tc0->rcv_nxt += 1; + tcp_program_ack (wrk, tc0); + tc0->state = TCP_STATE_CLOSE_WAIT; + stream_session_disconnect_notify (&tc0->connection); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); + TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); + error0 = TCP_ERROR_FIN_RCVD; + } + + done: + tcp_inc_err_counter (err_counters, error0, 1); } - delack_timers_init (tm, my_thread_index); + errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, + thread_index); + err_counters[TCP_ERROR_EVENT_FIFO_FULL] = errors; + tcp_store_err_counters (established, err_counters); + tcp_handle_postponed_dequeues (wrk); + vlib_buffer_free (vm, first_buffer, frame->n_vectors); - return from_frame->n_vectors; + return frame->n_vectors; } static uword @@ -1148,6 +2124,7 @@ VLIB_REGISTER_NODE (tcp4_established_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -1169,6 +2146,7 @@ VLIB_REGISTER_NODE (tcp6_established_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -1178,246 +2156,331 @@ 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; -always_inline uword -tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame, int is_ip4) +static u8 +tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) { - tcp_main_t *tm = vnet_get_tcp_main (); - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->cpu_index, errors = 0; - u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP; + transport_connection_t *tmp = 0; + u64 handle; - from = vlib_frame_vector_args (from_frame); - n_left_from = from_frame->n_vectors; + if (!tc) + return 1; - next_index = node->cached_next_index; + /* Proxy case */ + if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) + return 1; - while (n_left_from > 0) - { - u32 n_left_to_next; + u8 is_valid = (tc->c_lcl_port == hdr->dst_port + && (tc->state == TCP_STATE_LISTEN + || tc->c_rmt_port == hdr->src_port)); - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + if (!is_valid) + { + handle = session_lookup_half_open_handle (&tc->connection); + tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF, + tc->c_proto, tc->c_is_ip4); - while (n_left_from > 0 && n_left_to_next > 0) + if (tmp) { - u32 bi0, ack0, seq0; - vlib_buffer_t *b0; - tcp_header_t *tcp0 = 0; - tcp_connection_t *tc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - u32 n_advance_bytes0, n_data_bytes0; - tcp_connection_t *new_tc0; - u32 next0 = TCP_SYN_SENT_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; + if (tmp->lcl_port == hdr->dst_port + && tmp->rmt_port == hdr->src_port) + { + TCP_DBG ("half-open is valid!"); + } + } + } + return is_valid; +} - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; +/** + * Lookup transport connection + */ +static tcp_connection_t * +tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, + u8 is_ip4) +{ + tcp_header_t *tcp; + transport_connection_t *tconn; + tcp_connection_t *tc; + u8 is_filtered = 0; + if (is_ip4) + { + ip4_header_t *ip4; + ip4 = vlib_buffer_get_current (b); + tcp = ip4_next_header (ip4); + tconn = session_lookup_connection_wt4 (fib_index, + &ip4->dst_address, + &ip4->src_address, + tcp->dst_port, + tcp->src_port, + TRANSPORT_PROTO_TCP, + thread_index, &is_filtered); + tc = tcp_get_connection_from_transport (tconn); + ASSERT (tcp_lookup_is_valid (tc, tcp)); + } + else + { + ip6_header_t *ip6; + ip6 = vlib_buffer_get_current (b); + tcp = ip6_next_header (ip6); + tconn = session_lookup_connection_wt6 (fib_index, + &ip6->dst_address, + &ip6->src_address, + tcp->dst_port, + tcp->src_port, + TRANSPORT_PROTO_TCP, + thread_index, &is_filtered); + tc = tcp_get_connection_from_transport (tconn); + ASSERT (tcp_lookup_is_valid (tc, tcp)); + } + return tc; +} - b0 = vlib_get_buffer (vm, bi0); - tc0 = - tcp_half_open_connection_get (vnet_buffer (b0)-> - tcp.connection_index); +always_inline uword +tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame, int is_ip4) +{ + tcp_main_t *tm = vnet_get_tcp_main (); + u32 n_left_from, *from, *first_buffer, errors = 0; + u32 my_thread_index = vm->thread_index; + tcp_worker_ctx_t *wrk = tcp_get_worker (my_thread_index); - ack0 = vnet_buffer (b0)->tcp.ack_number; - seq0 = vnet_buffer (b0)->tcp.seq_number; + from = first_buffer = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; - /* Checksum computed by ipx_local no need to compute again */ + while (n_left_from > 0) + { + u32 bi0, ack0, seq0, error0 = TCP_ERROR_NONE; + tcp_connection_t *tc0, *new_tc0; + tcp_header_t *tcp0 = 0; + tcp_rx_trace_t *t0; + vlib_buffer_t *b0; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + + b0 = vlib_get_buffer (vm, bi0); + tc0 = + tcp_half_open_connection_get (vnet_buffer (b0)->tcp.connection_index); + if (PREDICT_FALSE (tc0 == 0)) + { + error0 = TCP_ERROR_INVALID_CONNECTION; + goto drop; + } - if (is_ip4) - { - ip40 = vlib_buffer_get_current (b0); - tcp0 = ip4_next_header (ip40); - n_advance_bytes0 = (ip4_header_bytes (ip40) - + tcp_header_bytes (tcp0)); - n_data_bytes0 = clib_net_to_host_u16 (ip40->length) - - n_advance_bytes0; - } - else - { - ip60 = vlib_buffer_get_current (b0); - tcp0 = ip6_next_header (ip60); - n_advance_bytes0 = tcp_header_bytes (tcp0); - n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length) - - n_advance_bytes0; - n_advance_bytes0 += sizeof (ip60[0]); - } + /* Half-open completed recently but the connection was't removed + * yet by the owning thread */ + if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) + { + /* Make sure the connection actually exists */ + ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0, + my_thread_index, is_ip4)); + goto drop; + } - if (PREDICT_FALSE - (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0))) - goto drop; + ack0 = vnet_buffer (b0)->tcp.ack_number; + seq0 = vnet_buffer (b0)->tcp.seq_number; + tcp0 = tcp_buffer_hdr (b0); - /* SYNs, FINs and data consume sequence numbers */ - vnet_buffer (b0)->tcp.seq_end = seq0 + tcp_is_syn (tcp0) - + tcp_is_fin (tcp0) + n_data_bytes0; + /* Crude check to see if the connection handle does not match + * the packet. Probably connection just switched to established */ + if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port + || tcp0->src_port != tc0->c_rmt_port)) + { + error0 = TCP_ERROR_INVALID_CONNECTION; + goto drop; + } - /* - * 1. check the ACK bit - */ + if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0) + && !tcp_syn (tcp0))) + { + error0 = TCP_ERROR_SEGMENT_INVALID; + goto drop; + } - /* - * If the ACK bit is set - * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless - * the RST bit is set, if so drop the segment and return) - * - * and discard the segment. Return. - * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. - */ - if (tcp_ack (tcp0)) + /* SYNs, FINs and data consume sequence numbers */ + vnet_buffer (b0)->tcp.seq_end = + seq0 + tcp_is_syn (tcp0) + tcp_is_fin (tcp0) + + vnet_buffer (b0)->tcp.data_len; + + /* + * 1. check the ACK bit + */ + + /* + * If the ACK bit is set + * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless + * the RST bit is set, if so drop the segment and return) + * + * and discard the segment. Return. + * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. + */ + if (tcp_ack (tcp0)) + { + if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) { - if (ack0 <= tc0->iss || ack0 > tc0->snd_nxt) - { - if (!tcp_rst (tcp0)) - tcp_send_reset (b0, is_ip4); - - goto drop; - } - - /* Make sure ACK is valid */ - if (tc0->snd_una > ack0) - goto drop; + if (!tcp_rst (tcp0)) + tcp_send_reset_w_pkt (tc0, b0, is_ip4); + error0 = TCP_ERROR_RCV_WND; + goto drop; } - /* - * 2. check the RST bit - */ - - if (tcp_rst (tcp0)) + /* Make sure ACK is valid */ + if (seq_gt (tc0->snd_una, ack0)) { - /* If ACK is acceptable, signal client that peer is not - * willing to accept connection and drop connection*/ - if (tcp_ack (tcp0)) - { - stream_session_connect_notify (&tc0->connection, sst, - 1 /* fail */ ); - tcp_connection_cleanup (tc0); - } + error0 = TCP_ERROR_ACK_INVALID; goto drop; } + } - /* - * 3. check the security and precedence (skipped) - */ - - /* - * 4. check the SYN bit - */ - - /* No SYN flag. Drop. */ - if (!tcp_syn (tcp0)) - goto drop; - - /* Stop connection establishment and retransmit timers */ - tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); - tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT_SYN); - - /* Valid SYN or SYN-ACK. Move connection from half-open pool to - * current thread pool. */ - pool_get (tm->connections[my_thread_index], new_tc0); - clib_memcpy (new_tc0, tc0, sizeof (*new_tc0)); - - new_tc0->c_thread_index = my_thread_index; - - /* Cleanup half-open connection XXX lock */ - pool_put (tm->half_open_connections, tc0); - - new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; - new_tc0->irs = seq0; - - /* Parse options */ - tcp_options_parse (tcp0, &new_tc0->opt); + /* + * 2. check the RST bit + */ - if (tcp_opts_tstamp (&new_tc0->opt)) - { - new_tc0->tsval_recent = new_tc0->opt.tsval; - new_tc0->tsval_recent_age = tcp_time_now (); - } + if (tcp_rst (tcp0)) + { + /* If ACK is acceptable, signal client that peer is not + * willing to accept connection and drop connection*/ + if (tcp_ack (tcp0)) + tcp_connection_reset (tc0); + error0 = TCP_ERROR_RST_RCVD; + goto drop; + } - if (tcp_opts_wscale (&new_tc0->opt)) - new_tc0->snd_wscale = new_tc0->opt.wscale; + /* + * 3. check the security and precedence (skipped) + */ - /* No scaling */ - new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window); - new_tc0->snd_wl1 = seq0; - new_tc0->snd_wl2 = ack0; + /* + * 4. check the SYN bit + */ - tcp_connection_init_vars (new_tc0); + /* No SYN flag. Drop. */ + if (!tcp_syn (tcp0)) + { + clib_warning ("not synack"); + error0 = TCP_ERROR_SEGMENT_INVALID; + goto drop; + } - /* SYN-ACK: See if we can switch to ESTABLISHED state */ - if (tcp_ack (tcp0)) - { - /* Our SYN is ACKed: we have iss < ack = snd_una */ + /* Parse options */ + if (tcp_options_parse (tcp0, &tc0->rcv_opts)) + { + clib_warning ("options parse fail"); + error0 = TCP_ERROR_OPTIONS; + goto drop; + } - /* TODO Dequeue acknowledged segments if we support Fast Open */ - new_tc0->snd_una = ack0; - new_tc0->state = TCP_STATE_ESTABLISHED; + /* Valid SYN or SYN-ACK. Move connection from half-open pool to + * current thread pool. */ + pool_get (tm->connections[my_thread_index], new_tc0); + clib_memcpy (new_tc0, tc0, sizeof (*new_tc0)); + new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index]; + new_tc0->c_thread_index = my_thread_index; + new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; + new_tc0->irs = seq0; + new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; + new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; + new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + /* If this is not the owning thread, wait for syn retransmit to + * expire and cleanup then */ + if (tcp_half_open_connection_cleanup (tc0)) + tc0->flags |= TCP_CONN_HALF_OPEN_DONE; + + if (tcp_opts_tstamp (&new_tc0->rcv_opts)) + { + new_tc0->tsval_recent = new_tc0->rcv_opts.tsval; + new_tc0->tsval_recent_age = tcp_time_now (); + } - /* Make sure las is initialized for the wnd computation */ - new_tc0->rcv_las = new_tc0->rcv_nxt; + if (tcp_opts_wscale (&new_tc0->rcv_opts)) + new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; - /* Notify app that we have connection */ - stream_session_connect_notify (&new_tc0->connection, sst, 0); + new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) + << new_tc0->snd_wscale; + new_tc0->snd_wl1 = seq0; + new_tc0->snd_wl2 = ack0; - /* Make sure after data segment processing ACK is sent */ - new_tc0->flags |= TCP_CONN_SNDACK; - } - /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ - else - { - new_tc0->state = TCP_STATE_SYN_RCVD; + tcp_connection_init_vars (new_tc0); - /* Notify app that we have connection */ - stream_session_connect_notify (&new_tc0->connection, sst, 0); + /* SYN-ACK: See if we can switch to ESTABLISHED state */ + if (PREDICT_TRUE (tcp_ack (tcp0))) + { + /* Our SYN is ACKed: we have iss < ack = snd_una */ - tcp_make_synack (new_tc0, b0); - next0 = tcp_next_output (is_ip4); + /* TODO Dequeue acknowledged segments if we support Fast Open */ + new_tc0->snd_una = ack0; + new_tc0->state = TCP_STATE_ESTABLISHED; - goto drop; - } + /* Make sure las is initialized for the wnd computation */ + new_tc0->rcv_las = new_tc0->rcv_nxt; - /* Read data, if any */ - if (n_data_bytes0) - { - error0 = - tcp_segment_rcv (tm, new_tc0, b0, n_data_bytes0, &next0); - if (error0 == TCP_ERROR_PURE_ACK) - error0 = TCP_ERROR_SYN_ACKS_RCVD; - } - else + /* Notify app that we have connection. If session layer can't + * allocate session send reset */ + if (session_stream_connect_notify (&new_tc0->connection, 0)) { - tcp_make_ack (new_tc0, b0); - next0 = tcp_next_output (new_tc0->c_is_ip4); + clib_warning ("connect notify fail"); + tcp_send_reset_w_pkt (new_tc0, b0, is_ip4); + tcp_connection_cleanup (new_tc0); + goto drop; } - drop: + /* Update rtt with the syn-ack sample */ + tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number); + TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0); + error0 = TCP_ERROR_SYN_ACKS_RCVD; + } + /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ + else + { + new_tc0->state = TCP_STATE_SYN_RCVD; - b0->error = error0 ? node->errors[error0] : 0; - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + /* Notify app that we have connection */ + if (session_stream_connect_notify (&new_tc0->connection, 0)) { - + tcp_connection_cleanup (new_tc0); + tcp_send_reset_w_pkt (tc0, b0, is_ip4); + TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0); + goto drop; } - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + tc0->rtt_ts = 0; + tcp_init_snd_vars (tc0); + tcp_send_synack (new_tc0); + error0 = TCP_ERROR_SYNS_RCVD; + goto drop; } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - errors = session_manager_flush_enqueue_events (my_thread_index); - if (errors) - { - if (is_ip4) - vlib_node_increment_counter (vm, tcp4_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); + /* Read data, if any */ + if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) + { + clib_warning ("rcvd data in syn-sent"); + error0 = tcp_segment_rcv (wrk, new_tc0, b0); + if (error0 == TCP_ERROR_ACK_OK) + error0 = TCP_ERROR_SYN_ACKS_RCVD; + } else - vlib_node_increment_counter (vm, tcp6_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); + { + tcp_program_ack (wrk, new_tc0); + } + + drop: + + tcp_inc_counter (syn_sent, error0, 1); + if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0)) + { + t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); + clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header)); + clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection)); + } } + errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, + my_thread_index); + tcp_inc_counter (syn_sent, TCP_ERROR_EVENT_FIFO_FULL, errors); + vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); + return from_frame->n_vectors; } @@ -1451,6 +2514,7 @@ VLIB_REGISTER_NODE (tcp4_syn_sent_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -1471,11 +2535,16 @@ VLIB_REGISTER_NODE (tcp6_syn_sent_node) = #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, foreach_tcp_state_next #undef _ - } -,}; + }, + .format_trace = format_tcp_rx_trace_short, +}; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv); + +vlib_node_registration_t tcp4_rcv_process_node; +vlib_node_registration_t tcp6_rcv_process_node; + /** * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED * as per RFC793 p. 64 @@ -1484,293 +2553,310 @@ always_inline uword tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) { - tcp_main_t *tm = vnet_get_tcp_main (); - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->cpu_index, errors = 0; + u32 thread_index = vm->thread_index, errors = 0, *first_buffer; + tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); + u32 n_left_from, *from; - from = vlib_frame_vector_args (from_frame); + from = first_buffer = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; - next_index = node->cached_next_index; - while (n_left_from > 0) { - u32 n_left_to_next; - - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left_from > 0 && n_left_to_next > 0) + u32 bi0, error0 = TCP_ERROR_NONE; + tcp_header_t *tcp0 = 0; + tcp_connection_t *tc0; + vlib_buffer_t *b0; + u8 is_fin0; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + + b0 = vlib_get_buffer (vm, bi0); + tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, + thread_index); + if (PREDICT_FALSE (tc0 == 0)) { - u32 bi0; - vlib_buffer_t *b0; - tcp_header_t *tcp0 = 0; - tcp_connection_t *tc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - u32 n_advance_bytes0, n_data_bytes0; - u32 next0 = TCP_RCV_PROCESS_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; + error0 = TCP_ERROR_INVALID_CONNECTION; + goto drop; + } - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; + tcp0 = tcp_buffer_hdr (b0); + is_fin0 = tcp_is_fin (tcp0); - b0 = vlib_get_buffer (vm, bi0); - tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, - my_thread_index); - if (PREDICT_FALSE (tc0 == 0)) + /* SYNs, FINs and data consume sequence numbers */ + vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number + + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len; + + if (CLIB_DEBUG) + { + tcp_connection_t *tmp; + tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index, + is_ip4); + if (tmp->state != tc0->state) { - error0 = TCP_ERROR_INVALID_CONNECTION; + clib_warning ("state changed"); goto drop; } + } - /* Checksum computed by ipx_local no need to compute again */ + /* + * Special treatment for CLOSED + */ + if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) + { + error0 = TCP_ERROR_CONNECTION_CLOSED; + goto drop; + } - if (is_ip4) - { - ip40 = vlib_buffer_get_current (b0); - tcp0 = ip4_next_header (ip40); - n_advance_bytes0 = (ip4_header_bytes (ip40) - + tcp_header_bytes (tcp0)); - n_data_bytes0 = clib_net_to_host_u16 (ip40->length) - - n_advance_bytes0; - } - else - { - ip60 = vlib_buffer_get_current (b0); - tcp0 = ip6_next_header (ip60); - n_advance_bytes0 = tcp_header_bytes (tcp0); - n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length) - - n_advance_bytes0; - n_advance_bytes0 += sizeof (ip60[0]); - } + /* + * For all other states (except LISTEN) + */ - /* SYNs, FINs and data consume sequence numbers */ - vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number - + tcp_is_syn (tcp0) + tcp_is_fin (tcp0) + n_data_bytes0; + /* 1-4: check SEQ, RST, SYN */ + if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, tcp0, &error0))) + goto drop; + /* 5: check the ACK field */ + switch (tc0->state) + { + case TCP_STATE_SYN_RCVD: /* - * Special treatment for CLOSED + * If the segment acknowledgment is not acceptable, form a + * reset segment, + * + * and send it. */ - switch (tc0->state) + if (!tcp_rcv_ack_is_acceptable (tc0, b0)) { - case TCP_STATE_CLOSED: + TCP_DBG ("connection not accepted"); + tcp_send_reset_w_pkt (tc0, b0, is_ip4); + error0 = TCP_ERROR_ACK_INVALID; goto drop; - break; } - /* - * For all other states (except LISTEN) - */ + /* Update rtt and rto */ + tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number); + + /* Switch state to ESTABLISHED */ + tc0->state = TCP_STATE_ESTABLISHED; + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + + /* Initialize session variables */ + tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; + tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) + << tc0->rcv_opts.wscale; + tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; + tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; + + /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ + tcp_retransmit_timer_reset (tc0); + tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); + stream_session_accept_notify (&tc0->connection); + error0 = TCP_ERROR_ACK_OK; + break; + case TCP_STATE_ESTABLISHED: + /* We can get packets in established state here because they + * were enqueued before state change */ + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) + goto drop; - /* 1-4: check SEQ, RST, SYN */ - if (PREDICT_FALSE - (tcp_segment_validate (vm, tc0, b0, tcp0, &next0))) + break; + case TCP_STATE_FIN_WAIT_1: + /* In addition to the processing for the ESTABLISHED state, if + * our FIN is now acknowledged then enter FIN-WAIT-2 and + * continue processing in that state. */ + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) + goto drop; + + /* Still have to send the FIN */ + if (tc0->flags & TCP_CONN_FINPNDG) { - error0 = TCP_ERROR_SEGMENT_INVALID; - goto drop; + /* TX fifo finally drained */ + if (!session_tx_fifo_max_dequeue (&tc0->connection)) + tcp_send_fin (tc0); + } + /* If FIN is ACKed */ + else if (tc0->snd_una == tc0->snd_una_max) + { + tc0->state = TCP_STATE_FIN_WAIT_2; + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + + /* Stop all retransmit timers because we have nothing more + * to send. Enable waitclose though because we're willing to + * wait for peer's FIN but not indefinitely. */ + tcp_connection_timers_reset (tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); } + break; + case TCP_STATE_FIN_WAIT_2: + /* In addition to the processing for the ESTABLISHED state, if + * the retransmission queue is empty, the user's CLOSE can be + * acknowledged ("ok") but do not delete the TCB. */ + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) + goto drop; + break; + case TCP_STATE_CLOSE_WAIT: + /* Do the same processing as for the ESTABLISHED state. */ + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) + goto drop; - /* 5: check the ACK field */ - switch (tc0->state) + if (tc0->flags & TCP_CONN_FINPNDG) { - case TCP_STATE_SYN_RCVD: - /* - * If the segment acknowledgment is not acceptable, form a - * reset segment, - * - * and send it. - */ - if (!tcp_rcv_ack_is_acceptable (tc0, b0)) - { - tcp_send_reset (b0, is_ip4); - goto drop; - } - /* Switch state to ESTABLISHED */ - tc0->state = TCP_STATE_ESTABLISHED; - - /* Initialize session variables */ - tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; - tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) - << tc0->opt.wscale; - tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; - tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; - - /* Shoulder tap the server */ - stream_session_accept_notify (&tc0->connection); - - /* Reset SYN-ACK retransmit timer */ - tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT); - break; - case TCP_STATE_ESTABLISHED: - /* We can get packets in established state here because they - * were enqueued before state change */ - if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) - goto drop; - - break; - case TCP_STATE_FIN_WAIT_1: - /* In addition to the processing for the ESTABLISHED state, if - * our FIN is now acknowledged then enter FIN-WAIT-2 and - * continue processing in that state. */ - if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) - goto drop; - - /* If FIN is ACKed */ - if (tc0->snd_una == tc0->snd_una_max) + /* TX fifo finally drained */ + if (!session_tx_fifo_max_dequeue (&tc0->connection)) { - tc0->state = TCP_STATE_FIN_WAIT_2; - /* Stop all timers, 2MSL will be set lower */ + tcp_send_fin (tc0); tcp_connection_timers_reset (tc0); + tc0->state = TCP_STATE_LAST_ACK; + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); } - break; - case TCP_STATE_FIN_WAIT_2: - /* In addition to the processing for the ESTABLISHED state, if - * the retransmission queue is empty, the user's CLOSE can be - * acknowledged ("ok") but do not delete the TCB. */ - if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) - goto drop; - /* check if rtx queue is empty and ack CLOSE TODO */ - break; - case TCP_STATE_CLOSE_WAIT: - /* Do the same processing as for the ESTABLISHED state. */ - if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) - goto drop; - break; - case TCP_STATE_CLOSING: - /* In addition to the processing for the ESTABLISHED state, if - * the ACK acknowledges our FIN then enter the TIME-WAIT state, - * otherwise ignore the segment. */ - if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) - goto drop; - - /* XXX test that send queue empty */ - tc0->state = TCP_STATE_TIME_WAIT; - goto drop; - - break; - case TCP_STATE_LAST_ACK: - /* The only thing that can arrive in this state is an - * acknowledgment of our FIN. If our FIN is now acknowledged, - * delete the TCB, enter the CLOSED state, and return. */ - - if (!tcp_rcv_ack_is_acceptable (tc0, b0)) - goto drop; - - tc0->state = TCP_STATE_CLOSED; + } + break; + case TCP_STATE_CLOSING: + /* In addition to the processing for the ESTABLISHED state, if + * the ACK acknowledges our FIN then enter the TIME-WAIT state, + * otherwise ignore the segment. */ + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) + goto drop; - /* Don't delete the connection/session yet. Instead, wait a - * reasonable amount of time until the pipes are cleared. In - * particular, this makes sure that we won't have dead sessions - * when processing events on the tx path */ - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); + tc0->state = TCP_STATE_TIME_WAIT; + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); + goto drop; - /* Stop retransmit */ - tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT); + break; + case TCP_STATE_LAST_ACK: + /* The only thing that [should] arrive in this state is an + * acknowledgment of our FIN. If our FIN is now acknowledged, + * delete the TCB, enter the CLOSED state, and return. */ + if (!tcp_rcv_ack_is_acceptable (tc0, b0)) + { + error0 = TCP_ERROR_ACK_INVALID; goto drop; - - break; - case TCP_STATE_TIME_WAIT: - /* The only thing that can arrive in this state is a - * retransmission of the remote FIN. Acknowledge it, and restart - * the 2 MSL timeout. */ - - /* TODO */ + } + error0 = TCP_ERROR_ACK_OK; + tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; + /* Apparently our ACK for the peer's FIN was lost */ + if (is_fin0 && tc0->snd_una != tc0->snd_una_max) + { + tcp_send_fin (tc0); goto drop; - break; - default: - ASSERT (0); } - /* 6: check the URG bit TODO */ + tc0->state = TCP_STATE_CLOSED; + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); - /* 7: process the segment text */ - switch (tc0->state) - { - case TCP_STATE_ESTABLISHED: - case TCP_STATE_FIN_WAIT_1: - case TCP_STATE_FIN_WAIT_2: - error0 = tcp_segment_rcv (tm, tc0, b0, n_data_bytes0, &next0); - break; - case TCP_STATE_CLOSE_WAIT: - case TCP_STATE_CLOSING: - case TCP_STATE_LAST_ACK: - case TCP_STATE_TIME_WAIT: - /* This should not occur, since a FIN has been received from the - * remote side. Ignore the segment text. */ - break; - } + /* Don't free the connection from the data path since + * we can't ensure that we have no packets already enqueued + * to output. Rely instead on the waitclose timer */ + tcp_connection_timers_reset (tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, 1); + + goto drop; + + break; + case TCP_STATE_TIME_WAIT: + /* The only thing that can arrive in this state is a + * retransmission of the remote FIN. Acknowledge it, and restart + * the 2 MSL timeout. */ - /* 8: check the FIN bit */ - if (!tcp_fin (tcp0)) + if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) goto drop; - switch (tc0->state) - { - case TCP_STATE_ESTABLISHED: - case TCP_STATE_SYN_RCVD: - /* Send FIN-ACK notify app and enter CLOSE-WAIT */ - tcp_connection_timers_reset (tc0); - tcp_make_fin (tc0, b0); - next0 = tcp_next_output (tc0->c_is_ip4); - stream_session_disconnect_notify (&tc0->connection); - tc0->state = TCP_STATE_CLOSE_WAIT; - break; - case TCP_STATE_CLOSE_WAIT: - case TCP_STATE_CLOSING: - case TCP_STATE_LAST_ACK: - /* move along .. */ - break; - case TCP_STATE_FIN_WAIT_1: - tc0->state = TCP_STATE_TIME_WAIT; - tcp_connection_timers_reset (tc0); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); - break; - case TCP_STATE_FIN_WAIT_2: - /* Got FIN, send ACK! */ - tc0->state = TCP_STATE_TIME_WAIT; - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); - tcp_make_ack (tc0, b0); - next0 = tcp_next_output (is_ip4); - break; - case TCP_STATE_TIME_WAIT: - /* Remain in the TIME-WAIT state. Restart the 2 MSL time-wait - * timeout. - */ - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); - break; - } - TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); + tcp_program_ack (wrk, tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); + goto drop; - b0->error = error0 ? node->errors[error0] : 0; + break; + default: + ASSERT (0); + } - drop: - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { + /* 6: check the URG bit TODO */ - } + /* 7: process the segment text */ + switch (tc0->state) + { + case TCP_STATE_ESTABLISHED: + case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_FIN_WAIT_2: + if (vnet_buffer (b0)->tcp.data_len) + error0 = tcp_segment_rcv (wrk, tc0, b0); + else if (is_fin0) + tc0->rcv_nxt += 1; + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + case TCP_STATE_TIME_WAIT: + /* This should not occur, since a FIN has been received from the + * remote side. Ignore the segment text. */ + break; + } - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + /* 8: check the FIN bit */ + if (!is_fin0) + goto drop; + + switch (tc0->state) + { + case TCP_STATE_ESTABLISHED: + case TCP_STATE_SYN_RCVD: + /* Send FIN-ACK notify app and enter CLOSE-WAIT */ + tcp_connection_timers_reset (tc0); + tcp_send_fin (tc0); + stream_session_disconnect_notify (&tc0->connection); + tc0->state = TCP_STATE_CLOSE_WAIT; + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + /* move along .. */ + break; + case TCP_STATE_FIN_WAIT_1: + tc0->state = TCP_STATE_CLOSING; + tcp_program_ack (wrk, tc0); + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + /* Wait for ACK but not forever */ + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); + break; + case TCP_STATE_FIN_WAIT_2: + /* Got FIN, send ACK! Be more aggressive with resource cleanup */ + tc0->state = TCP_STATE_TIME_WAIT; + tcp_connection_timers_reset (tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); + tcp_program_ack (wrk, tc0); + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + break; + case TCP_STATE_TIME_WAIT: + /* Remain in the TIME-WAIT state. Restart the time-wait + * timeout. + */ + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); + break; } + error0 = TCP_ERROR_FIN_RCVD; + TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } + drop: - errors = session_manager_flush_enqueue_events (my_thread_index); - if (errors) - { - if (is_ip4) - vlib_node_increment_counter (vm, tcp4_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); - else - vlib_node_increment_counter (vm, tcp6_established_node.index, - TCP_ERROR_EVENT_FIFO_FULL, errors); + tcp_inc_counter (rcv_process, error0, 1); + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + tcp_rx_trace_t *t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); + tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); + } } + errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, + thread_index); + tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors); + tcp_handle_postponed_dequeues (wrk); + vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); + return from_frame->n_vectors; } @@ -1804,6 +2890,7 @@ VLIB_REGISTER_NODE (tcp4_rcv_process_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -1825,6 +2912,7 @@ VLIB_REGISTER_NODE (tcp6_rcv_process_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -1840,143 +2928,146 @@ always_inline uword tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) { - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->cpu_index; - tcp_main_t *tm = vnet_get_tcp_main (); - u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP; + u32 n_left_from, *from, n_syns = 0, *first_buffer; + u32 my_thread_index = vm->thread_index; - from = vlib_frame_vector_args (from_frame); + from = first_buffer = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; - next_index = node->cached_next_index; - while (n_left_from > 0) { - u32 n_left_to_next; - - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + u32 bi0; + vlib_buffer_t *b0; + tcp_rx_trace_t *t0; + tcp_header_t *th0 = 0; + tcp_connection_t *lc0; + ip4_header_t *ip40; + ip6_header_t *ip60; + tcp_connection_t *child0; + u32 error0 = TCP_ERROR_NONE; + + bi0 = from[0]; + from += 1; + n_left_from -= 1; + + b0 = vlib_get_buffer (vm, bi0); + lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); - while (n_left_from > 0 && n_left_to_next > 0) + if (is_ip4) { - u32 bi0; - vlib_buffer_t *b0; - tcp_header_t *th0 = 0; - tcp_connection_t *lc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - tcp_connection_t *child0; - u32 error0 = TCP_ERROR_SYNS_RCVD, next0 = TCP_LISTEN_NEXT_DROP; - - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; - - b0 = vlib_get_buffer (vm, bi0); - lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); - - if (is_ip4) - { - ip40 = vlib_buffer_get_current (b0); - th0 = ip4_next_header (ip40); - } - else - { - ip60 = vlib_buffer_get_current (b0); - th0 = ip6_next_header (ip60); - } - - /* Create child session. For syn-flood protection use filter */ - - /* 1. first check for an RST */ - if (tcp_rst (th0)) - goto drop; - - /* 2. second check for an ACK */ - if (tcp_ack (th0)) - { - tcp_send_reset (b0, is_ip4); - goto drop; - } + ip40 = vlib_buffer_get_current (b0); + th0 = ip4_next_header (ip40); + } + else + { + ip60 = vlib_buffer_get_current (b0); + th0 = ip6_next_header (ip60); + } - /* 3. check for a SYN (did that already) */ + /* Create child session. For syn-flood protection use filter */ - /* Create child session and send SYN-ACK */ - pool_get (tm->connections[my_thread_index], child0); - memset (child0, 0, sizeof (*child0)); + /* 1. first check for an RST: handled in dispatch */ + /* if (tcp_rst (th0)) + goto drop; + */ - child0->c_c_index = child0 - tm->connections[my_thread_index]; - child0->c_lcl_port = lc0->c_lcl_port; - child0->c_rmt_port = th0->src_port; - child0->c_is_ip4 = is_ip4; - child0->c_thread_index = my_thread_index; + /* 2. second check for an ACK: handled in dispatch */ + /* if (tcp_ack (th0)) + { + tcp_send_reset (b0, is_ip4); + goto drop; + } + */ - if (is_ip4) - { - child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32; - child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32; - } - else - { - clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address, - sizeof (ip6_address_t)); - clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address, - sizeof (ip6_address_t)); - } + /* 3. check for a SYN (did that already) */ - if (stream_session_accept (&child0->connection, lc0->c_s_index, sst, - 0 /* notify */ )) - { - error0 = TCP_ERROR_CREATE_SESSION_FAIL; - goto drop; - } + /* Make sure connection wasn't just created */ + child0 = tcp_lookup_connection (lc0->c_fib_index, b0, my_thread_index, + is_ip4); + if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN)) + { + error0 = TCP_ERROR_CREATE_EXISTS; + goto drop; + } - tcp_options_parse (th0, &child0->opt); + /* Create child session and send SYN-ACK */ + child0 = tcp_connection_new (my_thread_index); + child0->c_lcl_port = th0->dst_port; + child0->c_rmt_port = th0->src_port; + child0->c_is_ip4 = is_ip4; + child0->state = TCP_STATE_SYN_RCVD; + child0->c_fib_index = lc0->c_fib_index; - child0->irs = vnet_buffer (b0)->tcp.seq_number; - child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1; - child0->state = TCP_STATE_SYN_RCVD; + if (is_ip4) + { + child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32; + child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32; + } + else + { + clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address, + sizeof (ip6_address_t)); + clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address, + sizeof (ip6_address_t)); + } - /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} - * segments are used to initialize PAWS. */ - if (tcp_opts_tstamp (&child0->opt)) - { - child0->tsval_recent = child0->opt.tsval; - child0->tsval_recent_age = tcp_time_now (); - } + if (tcp_options_parse (th0, &child0->rcv_opts)) + { + clib_warning ("options parse fail"); + goto drop; + } - if (tcp_opts_wscale (&child0->opt)) - child0->snd_wscale = child0->opt.wscale; + child0->irs = vnet_buffer (b0)->tcp.seq_number; + child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1; + child0->rcv_las = child0->rcv_nxt; + child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - /* No scaling */ - child0->snd_wnd = clib_net_to_host_u16 (th0->window); - child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; - child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; + /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} + * segments are used to initialize PAWS. */ + if (tcp_opts_tstamp (&child0->rcv_opts)) + { + child0->tsval_recent = child0->rcv_opts.tsval; + child0->tsval_recent_age = tcp_time_now (); + } - tcp_connection_init_vars (child0); + if (tcp_opts_wscale (&child0->rcv_opts)) + child0->snd_wscale = child0->rcv_opts.wscale; - TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0); + child0->snd_wnd = clib_net_to_host_u16 (th0->window) + << child0->snd_wscale; + child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; + child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; - /* Reuse buffer to make syn-ack and send */ - tcp_make_synack (child0, b0); - next0 = tcp_next_output (is_ip4); + tcp_connection_init_vars (child0); + TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1); - drop: - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { + if (stream_session_accept (&child0->connection, lc0->c_s_index, + 0 /* notify */ )) + { + clib_warning ("session accept fail"); + tcp_connection_cleanup (child0); + error0 = TCP_ERROR_CREATE_SESSION_FAIL; + goto drop; + } - } + tcp_send_synack (child0); + tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME); - b0->error = node->errors[error0]; + drop: - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); + clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); + clib_memcpy (&t0->tcp_connection, lc0, sizeof (t0->tcp_connection)); } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); + n_syns += (error0 == TCP_ERROR_NONE); } + + tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); + vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); + return from_frame->n_vectors; } @@ -2010,6 +3101,7 @@ VLIB_REGISTER_NODE (tcp4_listen_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -2031,6 +3123,7 @@ VLIB_REGISTER_NODE (tcp6_listen_node) = foreach_tcp_state_next #undef _ }, + .format_trace = format_tcp_rx_trace_short, }; /* *INDENT-ON* */ @@ -2047,159 +3140,263 @@ typedef enum _tcp_input_next TCP_INPUT_NEXT_SYN_SENT, TCP_INPUT_NEXT_ESTABLISHED, TCP_INPUT_NEXT_RESET, + TCP_INPUT_NEXT_PUNT, TCP_INPUT_N_NEXT } tcp_input_next_t; #define foreach_tcp4_input_next \ - _ (DROP, "error-drop") \ + _ (DROP, "ip4-drop") \ _ (LISTEN, "tcp4-listen") \ _ (RCV_PROCESS, "tcp4-rcv-process") \ _ (SYN_SENT, "tcp4-syn-sent") \ _ (ESTABLISHED, "tcp4-established") \ - _ (RESET, "tcp4-reset") + _ (RESET, "tcp4-reset") \ + _ (PUNT, "ip4-punt") #define foreach_tcp6_input_next \ - _ (DROP, "error-drop") \ + _ (DROP, "ip6-drop") \ _ (LISTEN, "tcp6-listen") \ _ (RCV_PROCESS, "tcp6-rcv-process") \ _ (SYN_SENT, "tcp6-syn-sent") \ _ (ESTABLISHED, "tcp6-established") \ - _ (RESET, "tcp6-reset") + _ (RESET, "tcp6-reset") \ + _ (PUNT, "ip6-punt") -typedef struct +#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) + +static void +tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4) { - u16 src_port; - u16 dst_port; - u8 state; -} tcp_rx_trace_t; + tcp_connection_t *tc; + tcp_header_t *tcp; + tcp_rx_trace_t *t; + int i; -u8 * -format_tcp_rx_trace (u8 * s, va_list * args) + for (i = 0; i < n_bufs; i++) + { + if (bs[i]->flags & VLIB_BUFFER_IS_TRACED) + { + t = vlib_add_trace (vm, node, bs[i], sizeof (*t)); + tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index, + vm->thread_index); + tcp = vlib_buffer_get_current (bs[i]); + tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4); + } + } +} + +static void +tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) { - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); + if (*error == TCP_ERROR_FILTERED) + { + *next = TCP_INPUT_NEXT_DROP; + } + else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6)) + { + *next = TCP_INPUT_NEXT_PUNT; + *error = TCP_ERROR_PUNT; + } + else + { + *next = TCP_INPUT_NEXT_RESET; + *error = TCP_ERROR_NO_LISTENER; + } +} - s = format (s, "TCP: src-port %d dst-port %U%s\n", - clib_net_to_host_u16 (t->src_port), - clib_net_to_host_u16 (t->dst_port), format_tcp_state, t->state); +static inline tcp_connection_t * +tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, + u8 is_ip4) +{ + u32 fib_index = vnet_buffer (b)->ip.fib_index; + int n_advance_bytes, n_data_bytes; + transport_connection_t *tc; + tcp_header_t *tcp; + u8 is_filtered = 0; - return s; + if (is_ip4) + { + ip4_header_t *ip4 = vlib_buffer_get_current (b); + tcp = ip4_next_header (ip4); + vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4; + n_advance_bytes = (ip4_header_bytes (ip4) + tcp_header_bytes (tcp)); + n_data_bytes = clib_net_to_host_u16 (ip4->length) - n_advance_bytes; + + /* Length check. Checksum computed by ipx_local no need to compute again */ + if (PREDICT_FALSE (n_advance_bytes < 0)) + { + *error = TCP_ERROR_LENGTH; + return 0; + } + + tc = session_lookup_connection_wt4 (fib_index, &ip4->dst_address, + &ip4->src_address, tcp->dst_port, + tcp->src_port, TRANSPORT_PROTO_TCP, + thread_index, &is_filtered); + } + else + { + ip6_header_t *ip6 = vlib_buffer_get_current (b); + tcp = ip6_next_header (ip6); + vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip6; + n_advance_bytes = tcp_header_bytes (tcp); + n_data_bytes = clib_net_to_host_u16 (ip6->payload_length) + - n_advance_bytes; + n_advance_bytes += sizeof (ip6[0]); + + if (PREDICT_FALSE (n_advance_bytes < 0)) + { + *error = TCP_ERROR_LENGTH; + return 0; + } + + tc = session_lookup_connection_wt6 (fib_index, &ip6->dst_address, + &ip6->src_address, tcp->dst_port, + tcp->src_port, TRANSPORT_PROTO_TCP, + thread_index, &is_filtered); + } + + vnet_buffer (b)->tcp.seq_number = clib_net_to_host_u32 (tcp->seq_number); + vnet_buffer (b)->tcp.ack_number = clib_net_to_host_u32 (tcp->ack_number); + vnet_buffer (b)->tcp.data_offset = n_advance_bytes; + vnet_buffer (b)->tcp.data_len = n_data_bytes; + vnet_buffer (b)->tcp.flags = 0; + + *error = is_filtered ? TCP_ERROR_FILTERED : *error; + + return tcp_get_connection_from_transport (tc); } -#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) +static inline void +tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc, + vlib_buffer_t * b, u16 * next, u32 * error) +{ + tcp_header_t *tcp; + u8 flags; + + tcp = tcp_buffer_hdr (b); + flags = tcp->flags & filter_flags; + *next = tm->dispatch_table[tc->state][flags].next; + *error = tm->dispatch_table[tc->state][flags].error; + + if (PREDICT_FALSE (*error == TCP_ERROR_DISPATCH + || *next == TCP_INPUT_NEXT_RESET)) + { + /* Overload tcp flags to store state */ + tcp_state_t state = tc->state; + vnet_buffer (b)->tcp.flags = tc->state; + + if (*error == TCP_ERROR_DISPATCH) + clib_warning ("disp error state %U flags %U", format_tcp_state, + state, format_tcp_flags, (int) flags); + } +} always_inline uword tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame, int is_ip4) + vlib_frame_t * frame, int is_ip4) { - u32 n_left_from, next_index, *from, *to_next; - u32 my_thread_index = vm->cpu_index; + u32 n_left_from, *from, thread_index = vm->thread_index; tcp_main_t *tm = vnet_get_tcp_main (); + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + u16 nexts[VLIB_FRAME_SIZE], *next; - from = vlib_frame_vector_args (from_frame); - n_left_from = from_frame->n_vectors; + tcp_set_time_now (tcp_get_worker (thread_index)); - next_index = node->cached_next_index; + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + vlib_get_buffers (vm, from, bufs, n_left_from); - while (n_left_from > 0) + b = bufs; + next = nexts; + + while (n_left_from >= 4) { - u32 n_left_to_next; + u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER; + tcp_connection_t *tc0, *tc1; - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + { + vlib_prefetch_buffer_header (b[2], STORE); + CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - tcp_header_t *tcp0 = 0; - tcp_connection_t *tc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - u32 error0 = TCP_ERROR_NO_LISTENER, next0 = TCP_INPUT_NEXT_DROP; - u8 flags0; + vlib_prefetch_buffer_header (b[3], STORE); + CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); + } + + next[0] = next[1] = TCP_INPUT_NEXT_DROP; - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; + tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); + tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4); - b0 = vlib_get_buffer (vm, bi0); - vnet_buffer (b0)->tcp.flags = 0; + if (PREDICT_TRUE (!tc0 + !tc1 == 0)) + { + ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); + ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); + + vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; + vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; - if (is_ip4) + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); + tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); + } + else + { + if (PREDICT_TRUE (tc0 != 0)) { - ip40 = vlib_buffer_get_current (b0); - tcp0 = ip4_next_header (ip40); - - /* lookup session */ - tc0 = - (tcp_connection_t *) - stream_session_lookup_transport4 (&ip40->dst_address, - &ip40->src_address, - tcp0->dst_port, - tcp0->src_port, - SESSION_TYPE_IP4_TCP, - my_thread_index); + ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); + vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); } else - { - ip60 = vlib_buffer_get_current (b0); - tcp0 = ip6_next_header (ip60); - tc0 = - (tcp_connection_t *) - stream_session_lookup_transport6 (&ip60->src_address, - &ip60->dst_address, - tcp0->src_port, - tcp0->dst_port, - SESSION_TYPE_IP6_TCP, - my_thread_index); - } + tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); - /* Session exists */ - if (PREDICT_TRUE (0 != tc0)) + if (PREDICT_TRUE (tc1 != 0)) { - /* Save connection index */ - vnet_buffer (b0)->tcp.connection_index = tc0->c_c_index; - vnet_buffer (b0)->tcp.seq_number = - clib_net_to_host_u32 (tcp0->seq_number); - vnet_buffer (b0)->tcp.ack_number = - clib_net_to_host_u32 (tcp0->ack_number); - - flags0 = tcp0->flags & filter_flags; - next0 = tm->dispatch_table[tc0->state][flags0].next; - error0 = tm->dispatch_table[tc0->state][flags0].error; - - if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH)) - { - /* Overload tcp flags to store state */ - vnet_buffer (b0)->tcp.flags = tc0->state; - } + ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); + vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; + tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); } else - { - /* Send reset */ - next0 = TCP_INPUT_NEXT_RESET; - error0 = TCP_ERROR_NO_LISTENER; - } - - b0->error = error0 ? node->errors[error0] : 0; + tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); + } - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { + b += 2; + next += 2; + n_left_from -= 2; + } + while (n_left_from > 0) + { + tcp_connection_t *tc0; + u32 error0 = TCP_ERROR_NO_LISTENER; - } + if (n_left_from > 1) + { + vlib_prefetch_buffer_header (b[1], STORE); + CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); + } - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); + next[0] = TCP_INPUT_NEXT_DROP; + tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); + if (PREDICT_TRUE (tc0 != 0)) + { + ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); + vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); } + else + tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); - vlib_put_next_frame (vm, node, next_index, n_left_to_next); + b += 1; + next += 1; + n_left_from -= 1; } - return from_frame->n_vectors; + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) + tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4); + + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + return frame->n_vectors; } static uword @@ -2261,12 +3458,6 @@ VLIB_REGISTER_NODE (tcp6_input_node) = /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input); -void -tcp_update_time (f64 now, u32 thread_index) -{ - tcp_main_t *tm = vnet_get_tcp_main (); - tw_timer_expire_timers_16t_2w_512sl (&tm->timer_wheels[thread_index], now); -} static void tcp_dispatch_table_init (tcp_main_t * tm) @@ -2287,8 +3478,18 @@ do { \ /* SYNs for new connections -> tcp-listen. */ _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); + _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); + _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_RST_RCVD); + _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, + TCP_ERROR_NONE); /* ACK for for a SYN-ACK -> tcp-rcv-process. */ _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, + TCP_ERROR_NONE); + _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, + TCP_ERROR_NONE); /* SYN-ACK for a SYN */ _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); @@ -2303,21 +3504,46 @@ do { \ _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); + _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, + TCP_ERROR_NONE); + _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); + _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, + TCP_ERROR_NONE); /* ACK or FIN-ACK to our FIN */ _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); /* FIN in reply to our FIN from the other side */ _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); /* FIN confirming that the peer (app) has closed */ _(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, + TCP_ERROR_NONE); _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, + TCP_ERROR_NONE); + _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, + TCP_ERROR_NONE); + _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); + _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); + _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, + TCP_ERROR_CONNECTION_CLOSED); #undef _ } -clib_error_t * +static clib_error_t * tcp_input_init (vlib_main_t * vm) { clib_error_t *error = 0;