X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_input.c;h=b82eab0cc33ad0d39315565671f26e8336caf80d;hb=573f44c2f5c883753bc9880eead1bd662586521d;hp=7ab7020ee9b5c2495db5e7f930425ce1c74aa156;hpb=558e3e09577a7b49e2fec58e8ac27f3f3ae0592f;p=vpp.git diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index 7ab7020ee9b..b82eab0cc33 100755 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -16,8 +16,8 @@ #include #include #include -#include #include +#include #include #include @@ -115,119 +115,6 @@ tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); } -/** - * Parse TCP header options. - * - * @param th TCP header - * @param to TCP options data structure to be populated - * @param is_syn set if packet is syn - * @return -1 if parsing failed - */ -static inline int -tcp_options_parse (tcp_header_t * th, tcp_options_t * to, u8 is_syn) -{ - const u8 *data; - u8 opt_len, opts_len, kind; - int j; - sack_block_t b; - - opts_len = (tcp_doff (th) << 2) - sizeof (tcp_header_t); - data = (const u8 *) (th + 1); - - /* Zero out all flags but those set in SYN */ - to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE - | TCP_OPTS_FLAG_TSTAMP | TCP_OPTION_MSS); - - for (; opts_len > 0; opts_len -= opt_len, data += opt_len) - { - kind = data[0]; - - /* Get options length */ - if (kind == TCP_OPTION_EOL) - break; - else if (kind == TCP_OPTION_NOOP) - { - opt_len = 1; - continue; - } - else - { - /* broken options */ - if (opts_len < 2) - return -1; - opt_len = data[1]; - - /* weird option length */ - if (opt_len < 2 || opt_len > opts_len) - return -1; - } - - /* Parse options */ - switch (kind) - { - case TCP_OPTION_MSS: - if (!is_syn) - break; - if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th)) - { - to->flags |= TCP_OPTS_FLAG_MSS; - to->mss = clib_net_to_host_u16 (*(u16 *) (data + 2)); - } - break; - case TCP_OPTION_WINDOW_SCALE: - if (!is_syn) - break; - if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th)) - { - to->flags |= TCP_OPTS_FLAG_WSCALE; - to->wscale = data[2]; - if (to->wscale > TCP_MAX_WND_SCALE) - to->wscale = TCP_MAX_WND_SCALE; - } - break; - case TCP_OPTION_TIMESTAMP: - if (is_syn) - to->flags |= TCP_OPTS_FLAG_TSTAMP; - if ((to->flags & TCP_OPTS_FLAG_TSTAMP) - && opt_len == TCP_OPTION_LEN_TIMESTAMP) - { - to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2)); - to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6)); - } - break; - case TCP_OPTION_SACK_PERMITTED: - if (!is_syn) - break; - if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th)) - to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; - break; - case TCP_OPTION_SACK_BLOCK: - /* If SACK permitted was not advertised or a SYN, break */ - if ((to->flags & TCP_OPTS_FLAG_SACK_PERMITTED) == 0 || tcp_syn (th)) - break; - - /* If too short or not correctly formatted, break */ - if (opt_len < 10 || ((opt_len - 2) % TCP_OPTION_LEN_SACK_BLOCK)) - break; - - to->flags |= TCP_OPTS_FLAG_SACK; - to->n_sack_blocks = (opt_len - 2) / TCP_OPTION_LEN_SACK_BLOCK; - vec_reset_length (to->sacks); - for (j = 0; j < to->n_sack_blocks; j++) - { - b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j)); - b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j)); - vec_add1 (to->sacks, b); - } - break; - default: - /* Nothing to see here */ - continue; - } - } - return 0; -} - /** * RFC1323: Check against wrapped sequence numbers (PAWS). If we have * timestamp to echo and it's less than tsval_recent, drop segment @@ -266,6 +153,98 @@ tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) } } +static void +tcp_handle_rst (tcp_connection_t * tc) +{ + switch (tc->rst_state) + { + case TCP_STATE_SYN_RCVD: + /* Cleanup everything. App wasn't notified yet */ + session_transport_delete_notify (&tc->connection); + tcp_connection_cleanup (tc); + break; + case TCP_STATE_SYN_SENT: + session_stream_connect_notify (&tc->connection, 1 /* fail */ ); + tcp_connection_cleanup (tc); + break; + case TCP_STATE_ESTABLISHED: + session_transport_reset_notify (&tc->connection); + session_transport_closed_notify (&tc->connection); + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_FIN_WAIT_2: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + session_transport_closed_notify (&tc->connection); + break; + case TCP_STATE_CLOSED: + case TCP_STATE_TIME_WAIT: + break; + default: + TCP_DBG ("reset state: %u", tc->state); + } +} + +static void +tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!tcp_disconnect_pending (tc)) + { + tc->rst_state = tc->state; + vec_add1 (wrk->pending_resets, tc->c_c_index); + tcp_disconnect_pending_on (tc); + } +} + +/** + * Handle reset packet + * + * Programs disconnect/reset notification that should be sent + * later by calling @ref tcp_handle_disconnects + */ +static void +tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + TCP_EVT (TCP_EVT_RST_RCVD, tc); + switch (tc->state) + { + case TCP_STATE_SYN_RCVD: + tcp_program_reset_ntf (wrk, tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + break; + case TCP_STATE_SYN_SENT: + /* Do not program ntf because the connection is half-open */ + tcp_handle_rst (tc); + break; + case TCP_STATE_ESTABLISHED: + tcp_connection_timers_reset (tc); + tcp_cong_recovery_off (tc); + tcp_program_reset_ntf (wrk, tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + tcp_program_cleanup (wrk, tc); + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_FIN_WAIT_2: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + tcp_connection_timers_reset (tc); + tcp_cong_recovery_off (tc); + tcp_program_reset_ntf (wrk, tc); + /* Make sure we mark the session as closed. In some states we may + * be still trying to send data */ + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + tcp_program_cleanup (wrk, tc); + break; + case TCP_STATE_CLOSED: + case TCP_STATE_TIME_WAIT: + break; + default: + TCP_DBG ("reset state: %u", tc->state); + } +} + /** * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 * @@ -392,7 +371,7 @@ tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, /* 2nd: check the RST bit */ if (PREDICT_FALSE (tcp_rst (th0))) { - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); *error0 = TCP_ERROR_RST_RCVD; goto error; } @@ -473,15 +452,6 @@ tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) } } -#ifndef CLIB_MARCH_VARIANT -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); -} -#endif /* CLIB_MARCH_VARIANT */ - /** * Update RTT estimate and RTO timer * @@ -494,16 +464,21 @@ tcp_update_rto (tcp_connection_t * tc) * return 1 if valid rtt 0 otherwise */ static int -tcp_update_rtt (tcp_connection_t * tc, u32 ack) +tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack) { u32 mrtt = 0; /* Karn's rule, part 1. Don't use retransmitted segments to estimate * RTT because they're ambiguous. */ - if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) + if (tcp_in_cong_recovery (tc)) { - if (tcp_in_recovery (tc)) - return 0; + /* Accept rtt estimates for samples that have not been retransmitted */ + if ((tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) + && !(rs->flags & TCP_BTS_IS_RXT)) + { + mrtt = rs->rtt_time * THZ; + goto estimate_rtt; + } goto done; } @@ -524,6 +499,8 @@ tcp_update_rtt (tcp_connection_t * tc, u32 ack) mrtt = clib_max (now - tc->rcv_opts.tsecr, 1); } +estimate_rtt: + /* Ignore dubious measurements */ if (mrtt == 0 || mrtt > TCP_RTT_MAX) goto done; @@ -593,7 +570,6 @@ tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) /* Dequeue the newly ACKed bytes */ session_tx_fifo_dequeue_drop (&tc->connection, tc->burst_acked); - tc->burst_acked = 0; tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) @@ -602,14 +578,17 @@ tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) tc->flags &= ~TCP_CONN_PSH_PENDING; } + if (tcp_is_descheduled (tc)) + tcp_reschedule (tc); + /* If everything has been acked, stop retransmit timer * otherwise update. */ - tcp_retransmit_timer_update (tc); + tcp_retransmit_timer_update (&wrk->timer_wheel, tc); - /* If not congested, update pacer based on our new - * cwnd estimate */ - if (!tcp_in_fastrecovery (tc)) - tcp_connection_tx_pacer_update (tc); + /* Update pacer based on our new cwnd estimate */ + tcp_connection_tx_pacer_update (tc); + + tc->burst_acked = 0; } _vec_len (wrk->pending_deq_acked) = 0; } @@ -625,546 +604,6 @@ tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) tc->burst_acked += tc->bytes_acked; } -/** - * Check if duplicate ack as per RFC5681 Sec. 2 - */ -static u8 -tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, - u32 prev_snd_una) -{ - return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) - && seq_gt (tc->snd_nxt, tc->snd_una) - && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) - && (prev_snd_wnd == tc->snd_wnd)); -} - -/** - * Checks if ack is a congestion control event. - */ -static u8 -tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, - u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) -{ - /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are - * defined to be 'duplicate' */ - *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)); -} - -#ifndef CLIB_MARCH_VARIANT -static u32 -scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) -{ - ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes)); - return hole - sb->holes; -} - -static u32 -scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) -{ - return hole->end - hole->start; -} - -sack_scoreboard_hole_t * -scoreboard_get_hole (sack_scoreboard_t * sb, u32 index) -{ - if (index != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, index); - return 0; -} - -sack_scoreboard_hole_t * -scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) -{ - if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, hole->next); - return 0; -} - -sack_scoreboard_hole_t * -scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) -{ - if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, hole->prev); - return 0; -} - -sack_scoreboard_hole_t * -scoreboard_first_hole (sack_scoreboard_t * sb) -{ - if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, sb->head); - return 0; -} - -sack_scoreboard_hole_t * -scoreboard_last_hole (sack_scoreboard_t * sb) -{ - if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, sb->tail); - return 0; -} - -static void -scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) -{ - sack_scoreboard_hole_t *next, *prev; - - if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) - { - next = pool_elt_at_index (sb->holes, hole->next); - next->prev = hole->prev; - } - else - { - sb->tail = hole->prev; - } - - if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) - { - prev = pool_elt_at_index (sb->holes, hole->prev); - prev->next = hole->next; - } - else - { - sb->head = hole->next; - } - - if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole) - sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; - - /* Poison the entry */ - if (CLIB_DEBUG > 0) - clib_memset (hole, 0xfe, sizeof (*hole)); - - pool_put (sb->holes, hole); -} - -static sack_scoreboard_hole_t * -scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index, - u32 start, u32 end) -{ - sack_scoreboard_hole_t *hole, *next, *prev; - u32 hole_index; - - pool_get (sb->holes, hole); - clib_memset (hole, 0, sizeof (*hole)); - - hole->start = start; - hole->end = end; - hole_index = scoreboard_hole_index (sb, hole); - - prev = scoreboard_get_hole (sb, prev_index); - if (prev) - { - hole->prev = prev_index; - hole->next = prev->next; - - if ((next = scoreboard_next_hole (sb, hole))) - next->prev = hole_index; - else - sb->tail = hole_index; - - prev->next = hole_index; - } - else - { - sb->head = hole_index; - hole->prev = TCP_INVALID_SACK_HOLE_INDEX; - hole->next = TCP_INVALID_SACK_HOLE_INDEX; - } - - return hole; -} -#endif /* CLIB_MARCH_VARIANT */ - -#ifndef CLIB_MARCH_VARIANT - -always_inline void -scoreboard_update_bytes (sack_scoreboard_t * sb, u32 ack, u32 snd_mss) -{ - sack_scoreboard_hole_t *left, *right; - u32 sacked = 0, blks = 0, old_sacked; - - old_sacked = sb->sacked_bytes; - - sb->last_lost_bytes = 0; - sb->lost_bytes = 0; - sb->sacked_bytes = 0; - - right = scoreboard_last_hole (sb); - if (!right) - { - sb->sacked_bytes = sb->high_sacked - ack; - return; - } - - if (seq_gt (sb->high_sacked, right->end)) - { - sacked = sb->high_sacked - right->end; - blks = 1; - } - - while (sacked < (TCP_DUPACK_THRESHOLD - 1) * snd_mss - && blks < TCP_DUPACK_THRESHOLD) - { - if (right->is_lost) - sb->lost_bytes += scoreboard_hole_bytes (right); - - left = scoreboard_prev_hole (sb, right); - if (!left) - { - ASSERT (right->start == ack || sb->is_reneging); - sacked += right->start - ack; - right = 0; - break; - } - - sacked += right->start - left->end; - blks++; - right = left; - } - - /* right is first lost */ - while (right) - { - sb->lost_bytes += scoreboard_hole_bytes (right); - sb->last_lost_bytes += right->is_lost ? 0 : right->end - right->start; - right->is_lost = 1; - left = scoreboard_prev_hole (sb, right); - if (!left) - { - ASSERT (right->start == ack || sb->is_reneging); - sacked += right->start - ack; - break; - } - sacked += right->start - left->end; - right = left; - } - - sb->sacked_bytes = sacked; - sb->last_sacked_bytes = sacked - (old_sacked - sb->last_bytes_delivered); -} - -/** - * 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; -} -#endif /* CLIB_MARCH_VARIANT */ - -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; -} - -#ifndef CLIB_MARCH_VARIANT -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->high_sacked = 0; - sb->high_rxt = 0; - sb->lost_bytes = 0; - sb->last_lost_bytes = 0; - sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; - sb->is_reneging = 0; -} -#endif /* CLIB_MARCH_VARIANT */ - -/** - * 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_nxt))); -} - -#ifndef CLIB_MARCH_VARIANT - -void -tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) -{ - sack_scoreboard_hole_t *hole, *next_hole; - sack_scoreboard_t *sb = &tc->sack_sb; - sack_block_t *blk, *rcv_sacks; - u32 blk_index = 0, i, j; - - sb->last_sacked_bytes = 0; - sb->last_bytes_delivered = 0; - - if (!tcp_opts_sack (&tc->rcv_opts) - && sb->head == TCP_INVALID_SACK_HOLE_INDEX) - return; - - /* 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_lt (blk->start, tc->snd_nxt) - && seq_leq (blk->end, tc->snd_nxt)) - { - 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)) - { - vec_add2 (tc->rcv_opts.sacks, blk, 1); - blk->start = tc->snd_una; - blk->end = ack; - } - - if (vec_len (tc->rcv_opts.sacks) == 0) - return; - - tcp_scoreboard_trace_add (tc, ack); - - /* Make sure blocks are ordered */ - rcv_sacks = tc->rcv_opts.sacks; - for (i = 0; i < vec_len (rcv_sacks); i++) - for (j = i + 1; j < vec_len (rcv_sacks); j++) - if (seq_lt (rcv_sacks[j].start, rcv_sacks[i].start)) - { - sack_block_t tmp = rcv_sacks[i]; - rcv_sacks[i] = rcv_sacks[j]; - rcv_sacks[j] = tmp; - } - - if (sb->head == TCP_INVALID_SACK_HOLE_INDEX) - { - /* Handle reneging as a special case */ - if (PREDICT_FALSE (sb->is_reneging)) - { - /* No holes, only sacked bytes */ - if (seq_leq (tc->snd_nxt, sb->high_sacked)) - { - /* No progress made so return */ - if (seq_leq (ack, tc->snd_una)) - return; - - /* Update sacked bytes delivered and return */ - sb->last_bytes_delivered = ack - tc->snd_una; - sb->sacked_bytes -= sb->last_bytes_delivered; - sb->is_reneging = seq_lt (ack, sb->high_sacked); - return; - } - - /* New hole above high sacked. Add it and process normally */ - hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, - sb->high_sacked, tc->snd_nxt); - sb->tail = scoreboard_hole_index (sb, hole); - } - /* Not reneging and no holes. Insert the first that covers all - * outstanding bytes */ - else - { - hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, - tc->snd_una, tc->snd_nxt); - sb->tail = scoreboard_hole_index (sb, hole); - } - sb->high_sacked = rcv_sacks[vec_len (rcv_sacks) - 1].end; - } - else - { - /* If we have holes but snd_nxt is beyond the last hole, update - * last hole end or add new hole after high sacked */ - hole = scoreboard_last_hole (sb); - if (seq_gt (tc->snd_nxt, hole->end)) - { - if (seq_geq (hole->start, sb->high_sacked)) - { - hole->end = tc->snd_nxt; - } - /* New hole after high sacked block */ - else if (seq_lt (sb->high_sacked, tc->snd_nxt)) - { - scoreboard_insert_hole (sb, sb->tail, sb->high_sacked, - tc->snd_nxt); - } - } - - /* Keep track of max byte sacked for when the last hole - * is acked */ - sb->high_sacked = seq_max (rcv_sacks[vec_len (rcv_sacks) - 1].end, - sb->high_sacked); - } - - /* Walk the holes with the SACK blocks */ - hole = pool_elt_at_index (sb->holes, sb->head); - - if (PREDICT_FALSE (sb->is_reneging)) - sb->last_bytes_delivered += hole->start - tc->snd_una; - - while (hole && blk_index < vec_len (rcv_sacks)) - { - blk = &rcv_sacks[blk_index]; - if (seq_leq (blk->start, hole->start)) - { - /* Block covers hole. Remove hole */ - if (seq_geq (blk->end, hole->end)) - { - next_hole = scoreboard_next_hole (sb, hole); - - /* If covered by ack, compute delivered bytes */ - if (blk->end == ack) - { - u32 sacked = next_hole ? next_hole->start : sb->high_sacked; - if (PREDICT_FALSE (seq_lt (ack, sacked))) - { - sb->last_bytes_delivered += ack - hole->end; - sb->is_reneging = 1; - } - else - { - sb->last_bytes_delivered += sacked - hole->end; - sb->is_reneging = 0; - } - } - scoreboard_remove_hole (sb, hole); - hole = next_hole; - } - /* Partial 'head' overlap */ - else - { - if (seq_gt (blk->end, hole->start)) - { - hole->start = blk->end; - } - blk_index++; - } - } - else - { - /* Hole must be split */ - if (seq_lt (blk->end, hole->end)) - { - u32 hole_index = scoreboard_hole_index (sb, hole); - next_hole = scoreboard_insert_hole (sb, hole_index, blk->end, - hole->end); - /* Pool might've moved */ - hole = scoreboard_get_hole (sb, hole_index); - hole->end = blk->start; - blk_index++; - ASSERT (hole->next == scoreboard_hole_index (sb, next_hole)); - } - else if (seq_lt (blk->start, hole->end)) - { - hole->end = blk->start; - } - hole = scoreboard_next_hole (sb, hole); - } - } - - scoreboard_update_bytes (sb, ack, tc->snd_mss); - - 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_nxt - seq_max (tc->snd_una, ack)); - ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_nxt - - seq_max (tc->snd_una, ack) || tcp_in_recovery (tc)); - ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc) - || sb->is_reneging || sb->holes[sb->head].start == ack); - ASSERT (sb->last_lost_bytes <= sb->lost_bytes); - - TCP_EVT (TCP_EVT_CC_SCOREBOARD, tc); -} -#endif /* CLIB_MARCH_VARIANT */ - /** * Try to update snd_wnd based on feedback received from peer. * @@ -1189,11 +628,22 @@ tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) /* Set persist timer if not set and we just got 0 wnd */ if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) - tcp_persist_timer_set (tc); + { + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + tcp_persist_timer_set (&wrk->timer_wheel, tc); + } } else { - tcp_persist_timer_reset (tc); + if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST))) + { + tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); + tcp_persist_timer_reset (&wrk->timer_wheel, tc); + } + + if (PREDICT_FALSE (tcp_is_descheduled (tc))) + tcp_reschedule (tc); + if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0)) { tc->rto_boff = 0; @@ -1203,70 +653,43 @@ tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) } } -#ifndef CLIB_MARCH_VARIANT /** * 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 +static void tcp_cc_init_congestion (tcp_connection_t * tc) { tcp_fastrecovery_on (tc); tc->snd_congestion = tc->snd_nxt; tc->cwnd_acc_bytes = 0; tc->snd_rxt_bytes = 0; + tc->rxt_delivered = 0; + tc->prr_delivered = 0; + tc->prr_start = tc->snd_una; tc->prev_ssthresh = tc->ssthresh; tc->prev_cwnd = tc->cwnd; - tc->cc_algo->congestion (tc); - tc->fr_occurences += 1; - TCP_EVT (TCP_EVT_CC_EVT, tc, 4); -} -#endif /* CLIB_MARCH_VARIANT */ -static void -tcp_cc_recovery_exit (tcp_connection_t * tc) -{ - tc->rto_boff = 0; - tcp_update_rto (tc); - tc->snd_rxt_ts = 0; - tc->rtt_ts = 0; - tcp_recovery_off (tc); - TCP_EVT (TCP_EVT_CC_EVT, tc, 3); -} + tc->snd_rxt_ts = tcp_tstamp (tc); + tcp_cc_congestion (tc); -#ifndef CLIB_MARCH_VARIANT -void -tcp_cc_fastrecovery_clear (tcp_connection_t * tc) -{ - tc->snd_rxt_bytes = 0; - tc->rcv_dupacks = 0; - tc->rtt_ts = 0; + /* Post retransmit update cwnd to ssthresh and account for the + * three segments that have left the network and should've been + * buffered at the receiver XXX */ + if (!tcp_opts_sack_permitted (&tc->rcv_opts)) + tc->cwnd += 3 * tc->snd_mss; - tcp_fastrecovery_off (tc); - tcp_fastrecovery_first_off (tc); - tc->flags &= ~TCP_CONN_FRXT_PENDING; - - TCP_EVT (TCP_EVT_CC_EVT, tc, 3); + tc->fr_occurences += 1; + TCP_EVT (TCP_EVT_CC_EVT, tc, 4); } -#endif /* CLIB_MARCH_VARIANT */ static void tcp_cc_congestion_undo (tcp_connection_t * tc) { tc->cwnd = tc->prev_cwnd; tc->ssthresh = tc->prev_ssthresh; - tc->rcv_dupacks = 0; - if (tcp_in_recovery (tc)) - { - tcp_cc_recovery_exit (tc); - tc->snd_nxt = seq_max (tc->snd_nxt, tc->snd_congestion); - } - else if (tcp_in_fastrecovery (tc)) - { - tcp_cc_fastrecovery_clear (tc); - } tcp_cc_undo_recovery (tc); ASSERT (tc->rto_boff == 0); TCP_EVT (TCP_EVT_CC_EVT, tc, 5); @@ -1282,41 +705,97 @@ tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) } static inline u8 -tcp_cc_is_spurious_fast_rxt (tcp_connection_t * tc) +tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) { - return (tcp_in_fastrecovery (tc) - && tc->cwnd > tc->ssthresh + 3 * tc->snd_mss); + return (tcp_cc_is_spurious_timeout_rxt (tc)); } -static u8 -tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) +static inline u8 +tcp_should_fastrecover_sack (tcp_connection_t * tc) { - return (tcp_cc_is_spurious_timeout_rxt (tc) - || tcp_cc_is_spurious_fast_rxt (tc)); + return (tc->sack_sb.lost_bytes + || ((TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss + < tc->sack_sb.sacked_bytes)); +} + +static inline u8 +tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack) +{ + if (!has_sack) + { + /* If of of the two conditions lower hold, reset dupacks because + * we're probably after timeout (RFC6582 heuristics). + * If Cumulative ack does not cover more than congestion threshold, + * and: + * 1) The following doesn't hold: The congestion window is greater + * than SMSS bytes and the difference between highest_ack + * and prev_highest_ack is at most 4*SMSS bytes + * 2) Echoed timestamp in the last non-dup ack does not equal the + * stored timestamp + */ + if (seq_leq (tc->snd_una, tc->snd_congestion) + && ((!(tc->cwnd > tc->snd_mss + && tc->bytes_acked <= 4 * tc->snd_mss)) + || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) + { + tc->rcv_dupacks = 0; + return 0; + } + } + return ((tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) + || tcp_should_fastrecover_sack (tc)); } static int tcp_cc_recover (tcp_connection_t * tc) { + sack_scoreboard_hole_t *hole; + u8 is_spurious = 0; + ASSERT (tcp_in_cong_recovery (tc)); + if (tcp_cc_is_spurious_retransmit (tc)) { tcp_cc_congestion_undo (tc); - return 1; + is_spurious = 1; } - if (tcp_in_recovery (tc)) - tcp_cc_recovery_exit (tc); - else if (tcp_in_fastrecovery (tc)) + tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); + tc->rcv_dupacks = 0; + + /* Previous recovery left us congested. Continue sending as part + * of the current recovery event with an updated snd_congestion */ + if (tc->sack_sb.sacked_bytes) { - tcp_cc_recovered (tc); - tcp_cc_fastrecovery_clear (tc); + tc->snd_congestion = tc->snd_nxt; + tcp_program_retransmit (tc); + return is_spurious; } + tc->rxt_delivered = 0; + tc->snd_rxt_bytes = 0; + tc->snd_rxt_ts = 0; + tc->prr_delivered = 0; + tc->rtt_ts = 0; + tc->flags &= ~TCP_CONN_RXT_PENDING; + + hole = scoreboard_first_hole (&tc->sack_sb); + if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt) + scoreboard_clear (&tc->sack_sb); + + if (!tcp_in_recovery (tc) && !is_spurious) + tcp_cc_recovered (tc); + + tcp_fastrecovery_off (tc); + tcp_fastrecovery_first_off (tc); + tcp_recovery_off (tc); + TCP_EVT (TCP_EVT_CC_EVT, tc, 3); + ASSERT (tc->rto_boff == 0); ASSERT (!tcp_in_cong_recovery (tc)); ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); - return 0; + + return is_spurious; } static void @@ -1340,19 +819,6 @@ tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs) tc->snd_congestion = tc->snd_una - 1; } -static u8 -tcp_should_fastrecover_sack (tcp_connection_t * tc) -{ - return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes; -} - -static u8 -tcp_should_fastrecover (tcp_connection_t * tc) -{ - return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD - || tcp_should_fastrecover_sack (tc)); -} - /** * One function to rule them all ... and in the darkness bind them */ @@ -1360,110 +826,81 @@ static void tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 is_dack) { - u32 rxt_delivered; + u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts); + + /* If reneging, wait for timer based retransmits */ + if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging)) + return; - if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts)) - { - if (tc->bytes_acked) - goto partial_ack; - tcp_program_fastretransmit (tc); - return; - } /* - * Duplicate ACK. Check if we should enter fast recovery, or if already in - * it account for the bytes that left the network. + * If not in recovery, figure out if we should enter */ - else if (is_dack && !tcp_in_recovery (tc)) + if (!tcp_in_cong_recovery (tc)) { - TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); - ASSERT (tc->snd_una != tc->snd_nxt || tc->sack_sb.last_sacked_bytes); + ASSERT (is_dack); 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)); - tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); - 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); - - if (tcp_opts_sack_permitted (&tc->rcv_opts)) - scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una); - - /* 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 (tc); - return; - } - else if (!tc->bytes_acked - || (tc->bytes_acked && !tcp_in_cong_recovery (tc))) - { - tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); - 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))) + TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); + tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); + + if (tcp_should_fastrecover (tc, has_sack)) { - tc->rcv_dupacks = 0; - return; + tcp_cc_init_congestion (tc); + + if (has_sack) + scoreboard_init_rxt (&tc->sack_sb, tc->snd_una); + + tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); + tcp_program_retransmit (tc); } - } - if (!tc->bytes_acked) - return; + return; + } -partial_ack: - TCP_EVT (TCP_EVT_CC_PACK, tc); + /* + * Already in recovery + */ /* - * Legitimate ACK. 1) See if we can exit recovery + * Process (re)transmit feedback. Output path uses this to decide how much + * more data to release into the network */ + if (has_sack) + { + if (!tc->bytes_acked && tc->sack_sb.rxt_sacked) + tcp_fastrecovery_first_on (tc); + + tc->rxt_delivered += tc->sack_sb.rxt_sacked; + tc->prr_delivered += tc->bytes_acked + tc->sack_sb.last_sacked_bytes + - tc->sack_sb.last_bytes_delivered; + } + else + { + if (is_dack) + { + tc->rcv_dupacks += 1; + TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); + } + tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked, + tc->snd_rxt_bytes); + if (is_dack) + tc->prr_delivered += clib_min (tc->snd_mss, + tc->snd_nxt - tc->snd_una); + else + tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked, + tc->snd_mss * + tc->rcv_dupacks); - /* 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); + /* If partial ack, assume that the first un-acked segment was lost */ + if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) + tcp_fastrecovery_first_on (tc); + } + /* + * See if we can exit and stop retransmitting + */ if (seq_geq (tc->snd_una, tc->snd_congestion)) { - tcp_retransmit_timer_update (tc); - /* If spurious return, we've already updated everything */ if (tcp_cc_recover (tc)) { @@ -1476,61 +913,71 @@ partial_ack: return; } + tcp_program_retransmit (tc); + /* - * Legitimate ACK. 2) If PARTIAL ACK try to retransmit + * Notify cc of the event */ - /* XXX limit this only to first partial ack? */ - tcp_retransmit_timer_update (tc); + if (!tc->bytes_acked) + { + tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); + return; + } /* RFC6675: If the incoming ACK is a cumulative acknowledgment, * reset dupacks to 0. Also needed if in congestion recovery */ tc->rcv_dupacks = 0; - /* Post RTO timeout don't try anything fancy */ if (tcp_in_recovery (tc)) - { - tcp_cc_rcv_ack (tc, rs); - transport_add_tx_event (&tc->connection); - return; - } + tcp_cc_rcv_ack (tc, rs); + else + tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs); +} + +static void +tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs) +{ + if (!tcp_in_cong_recovery (tc)) + return; - /* Remove retransmitted bytes that have been delivered */ if (tcp_opts_sack_permitted (&tc->rcv_opts)) - { - ASSERT (tc->bytes_acked >= tc->sack_sb.last_bytes_delivered - || (tc->flags & TCP_CONN_FINSNT)); + tcp_rcv_sacks (tc, tc->snd_una); - /* 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.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); - if (tc->snd_rxt_bytes > tc->bytes_acked) - tc->snd_rxt_bytes -= tc->bytes_acked; - else - tc->snd_rxt_bytes = 0; - } + tc->bytes_acked = 0; - tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs); + if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) + tcp_bt_sample_delivery_rate (tc, rs); - /* - * Since this was a partial ack, try to retransmit some more data - */ - tcp_program_fastretransmit (tc); + tcp_cc_handle_event (tc, rs, 1); +} + +/** + * Check if duplicate ack as per RFC5681 Sec. 2 + */ +always_inline u8 +tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, + u32 prev_snd_una) +{ + return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) + && seq_gt (tc->snd_nxt, tc->snd_una) + && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) + && (prev_snd_wnd == tc->snd_wnd)); +} + +/** + * Checks if ack is a congestion control event. + */ +static u8 +tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, + u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) +{ + /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are + * defined to be 'duplicate' as well */ + *is_dack = tc->sack_sb.last_sacked_bytes + || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); + + return (*is_dack || tcp_in_cong_recovery (tc)); } /** @@ -1570,8 +1017,12 @@ tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, tc->errors.below_ack_wnd += 1; *error = TCP_ERROR_ACK_OLD; TCP_EVT (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, 0, 1); + + if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd)) + return -1; + + tcp_handle_old_ack (tc, &rs); + /* Don't drop yet */ return 0; } @@ -1594,15 +1045,15 @@ process_ack: tc->snd_una = vnet_buffer (b)->tcp.ack_number; tcp_validate_txf_size (tc, tc->bytes_acked); + if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) + tcp_bt_sample_delivery_rate (tc, &rs); + if (tc->bytes_acked) { tcp_program_dequeue (wrk, tc); - tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number); + tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number); } - if (tc->flags & TCP_CONN_RATE_SAMPLE) - tcp_bt_sample_delivery_rate (tc, &rs); - TCP_EVT (TCP_EVT_ACK_RCVD, tc); /* @@ -1645,22 +1096,35 @@ tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) static void tcp_handle_disconnects (tcp_worker_ctx_t * wrk) { - u32 thread_index, *pending_disconnects; + u32 thread_index, *pending_disconnects, *pending_resets; tcp_connection_t *tc; int i; - if (!vec_len (wrk->pending_disconnects)) - return; + if (vec_len (wrk->pending_disconnects)) + { + thread_index = wrk->vm->thread_index; + pending_disconnects = wrk->pending_disconnects; + for (i = 0; i < vec_len (pending_disconnects); i++) + { + tc = tcp_connection_get (pending_disconnects[i], thread_index); + tcp_disconnect_pending_off (tc); + session_transport_closing_notify (&tc->connection); + } + _vec_len (wrk->pending_disconnects) = 0; + } - thread_index = wrk->vm->thread_index; - pending_disconnects = wrk->pending_disconnects; - for (i = 0; i < vec_len (pending_disconnects); i++) + if (vec_len (wrk->pending_resets)) { - tc = tcp_connection_get (pending_disconnects[i], thread_index); - tcp_disconnect_pending_off (tc); - session_transport_closing_notify (&tc->connection); + thread_index = wrk->vm->thread_index; + pending_resets = wrk->pending_resets; + for (i = 0; i < vec_len (pending_resets); i++) + { + tc = tcp_connection_get (pending_resets[i], thread_index); + tcp_disconnect_pending_off (tc); + tcp_handle_rst (tc); + } + _vec_len (wrk->pending_resets) = 0; } - _vec_len (wrk->pending_disconnects) = 0; } static void @@ -1673,99 +1137,18 @@ tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, /* Account for the FIN and send ack */ tc->rcv_nxt += 1; + tc->flags |= TCP_CONN_FINRCVD; tcp_program_ack (tc); /* Enter CLOSE-WAIT and notify session. To avoid lingering * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT); tcp_program_disconnect (wrk, tc); - tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); + tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, + tcp_cfg.closewait_time); TCP_EVT (TCP_EVT_FIN_RCVD, tc); *error = TCP_ERROR_FIN_RCVD; } -#ifndef CLIB_MARCH_VARIANT -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. - * - * Makes sure the first block contains the segment that generated the current - * ACK and the following ones are the ones most recently reported in SACK - * blocks. - * - * @param tc TCP connection for which the SACK list is updated - * @param start Start sequence number of the newest SACK block - * @param end End sequence of the newest SACK block - */ -void -tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end) -{ - sack_block_t *new_list = tc->snd_sacks_fl, *block = 0; - int i; - - /* If the first segment is ooo add it to the list. Last write might've moved - * rcv_nxt over the first segment. */ - if (seq_lt (tc->rcv_nxt, start)) - { - vec_add2 (new_list, block, 1); - block->start = start; - block->end = end; - } - - /* Find the blocks still worth keeping. */ - for (i = 0; i < vec_len (tc->snd_sacks); i++) - { - /* Discard if rcv_nxt advanced beyond current block */ - if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)) - continue; - - /* Merge or drop if segment overlapped by the new segment */ - if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start) - && seq_leq (tc->snd_sacks[i].start, new_list[0].end))) - { - 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]); - } - - ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS); - - /* Replace old vector with new one */ - vec_reset_length (tc->snd_sacks); - tc->snd_sacks_fl = 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; -} -#endif /* CLIB_MARCH_VARIANT */ - /** Enqueue data for delivery to application */ static int tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, @@ -1800,6 +1183,10 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, } else { + /* Packet made it through for ack processing */ + if (tc->rcv_wnd < tc->snd_mss) + return TCP_ERROR_ZERO_RWND; + return TCP_ERROR_FIFO_FULL; } @@ -1940,7 +1327,8 @@ tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, * 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 (tc); + tcp_program_dupack (tc); + tc->errors.below_data_wnd++; error = TCP_ERROR_SEGMENT_OLD; goto done; } @@ -1975,7 +1363,8 @@ in_order: if (tcp_can_delack (tc)) { if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)) - tcp_timer_set (tc, TCP_TIMER_DELACK, tcp_cfg.delack_time); + tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_DELACK, + tcp_cfg.delack_time); goto done; } @@ -1997,12 +1386,12 @@ 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 *); + tcp_connection_t *tc = &t->tcp_connection; u32 indent = format_get_indent (s); - s = format (s, "%U\n%U%U", - format_tcp_header, &t->tcp_header, 128, - format_white_space, indent, - format_tcp_connection, &t->tcp_connection, 1); + s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc, + format_tcp_state, tc->state, format_white_space, indent, + format_tcp_header, &t->tcp_header, 128); return s; } @@ -2248,7 +1637,8 @@ VLIB_REGISTER_NODE (tcp6_established_node) = static u8 -tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) +tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b, + tcp_header_t * hdr) { transport_connection_t *tmp = 0; u64 handle; @@ -2260,9 +1650,36 @@ tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) return 1; + u8 is_ip_valid = 0, val_l, val_r; + + if (tc->connection.is_ip4) + { + ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b); + + val_l = !ip4_address_compare (&ip4_hdr->dst_address, + &tc->connection.lcl_ip.ip4); + val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1); + val_r = !ip4_address_compare (&ip4_hdr->src_address, + &tc->connection.rmt_ip.ip4); + val_r = val_r || tc->state == TCP_STATE_LISTEN; + is_ip_valid = val_l && val_r; + } + else + { + ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b); + + val_l = !ip6_address_compare (&ip6_hdr->dst_address, + &tc->connection.lcl_ip.ip6); + val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0); + val_r = !ip6_address_compare (&ip6_hdr->src_address, + &tc->connection.rmt_ip.ip6); + val_r = val_r || tc->state == TCP_STATE_LISTEN; + is_ip_valid = val_l && val_r; + } + u8 is_valid = (tc->c_lcl_port == hdr->dst_port && (tc->state == TCP_STATE_LISTEN - || tc->c_rmt_port == hdr->src_port)); + || tc->c_rmt_port == hdr->src_port) && is_ip_valid); if (!is_valid) { @@ -2276,6 +1693,7 @@ tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) && tmp->rmt_port == hdr->src_port) { TCP_DBG ("half-open is valid!"); + is_valid = 1; } } } @@ -2306,7 +1724,7 @@ tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, TRANSPORT_PROTO_TCP, thread_index, &is_filtered); tc = tcp_get_connection_from_transport (tconn); - ASSERT (tcp_lookup_is_valid (tc, tcp)); + ASSERT (tcp_lookup_is_valid (tc, b, tcp)); } else { @@ -2321,11 +1739,41 @@ tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, TRANSPORT_PROTO_TCP, thread_index, &is_filtered); tc = tcp_get_connection_from_transport (tconn); - ASSERT (tcp_lookup_is_valid (tc, tcp)); + ASSERT (tcp_lookup_is_valid (tc, b, tcp)); } return tc; } +static tcp_connection_t * +tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4) +{ + session_t *s; + + if (is_ip4) + { + ip4_header_t *ip4 = vlib_buffer_get_current (b); + tcp_header_t *tcp = tcp_buffer_hdr (b); + s = session_lookup_listener4 (fib_index, + &ip4->dst_address, + tcp->dst_port, TRANSPORT_PROTO_TCP, 1); + } + else + { + ip6_header_t *ip6 = vlib_buffer_get_current (b); + tcp_header_t *tcp = tcp_buffer_hdr (b); + s = session_lookup_listener6 (fib_index, + &ip6->dst_address, + tcp->dst_port, TRANSPORT_PROTO_TCP, 1); + + } + if (PREDICT_TRUE (s != 0)) + return tcp_get_connection_from_transport (transport_get_listener + (TRANSPORT_PROTO_TCP, + s->connection_index)); + else + return 0; +} + always_inline void tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4) { @@ -2347,16 +1795,19 @@ tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4) } lb = load_balance_get (lb_idx); + if (PREDICT_FALSE (lb->lb_n_buckets > 1)) + return; dpo = load_balance_get_bucket_i (lb, 0); - sw_if_idx = dpo->dpoi_index; - hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx); + sw_if_idx = dpo_get_urpf (dpo); + if (PREDICT_FALSE (sw_if_idx == ~0)) + return; - tc->is_tso = - ((hw_if->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0) ? 0 : 1; + hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx); + if (hw_if->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) + tc->cfg_flags |= TCP_CFG_F_TSO; } - always_inline uword tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) @@ -2462,7 +1913,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* 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); + tcp_rcv_rst (wrk, tc0); error0 = TCP_ERROR_RST_RCVD; goto drop; } @@ -2534,7 +1985,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Notify app that we have connection. If session layer can't * allocate session send reset */ - if (session_stream_connect_notify (&new_tc0->connection, 0)) + if (session_stream_connect_notify (&new_tc0->connection, + SESSION_E_NONE)) { tcp_send_reset_w_pkt (new_tc0, b0, my_thread_index, is_ip4); tcp_connection_cleanup (new_tc0); @@ -2555,7 +2007,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, new_tc0->state = TCP_STATE_SYN_RCVD; /* Notify app that we have connection */ - if (session_stream_connect_notify (&new_tc0->connection, 0)) + if (session_stream_connect_notify (&new_tc0->connection, + SESSION_E_NONE)) { tcp_connection_cleanup (new_tc0); tcp_send_reset_w_pkt (tc0, b0, my_thread_index, is_ip4); @@ -2573,7 +2026,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, goto drop; } - tcp_check_tx_offload (new_tc0, is_ip4); + if (!(new_tc0->cfg_flags & TCP_CFG_F_NO_TSO)) + tcp_check_tx_offload (new_tc0, is_ip4); /* Read data, if any */ if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) @@ -2585,7 +2039,9 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } else { - tcp_program_ack (new_tc0); + /* Send ack now instead of programming it because connection was + * just established and it's not optional. */ + tcp_send_ack (new_tc0); } drop: @@ -2604,6 +2060,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, my_thread_index); tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors); vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); + tcp_handle_disconnects (wrk); return from_frame->n_vectors; } @@ -2701,14 +2158,17 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, 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) + if (!(tc0->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP)) { - if (tc0->state != TCP_STATE_CLOSED) - clib_warning ("state changed"); - goto drop; + tcp_connection_t *tmp; + tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index, + is_ip4); + if (tmp->state != tc0->state) + { + if (tc0->state != TCP_STATE_CLOSED) + clib_warning ("state changed"); + goto drop; + } } } @@ -2737,7 +2197,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Make sure the segment is exactly right */ if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number || is_fin0) { - tcp_connection_reset (tc0); + tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4); error0 = TCP_ERROR_SEGMENT_INVALID; goto drop; } @@ -2750,18 +2210,21 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, */ if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) { - tcp_connection_reset (tc0); + tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4); + error0 = TCP_ERROR_SEGMENT_INVALID; goto drop; } /* Update rtt and rto */ tcp_estimate_initial_rtt (tc0); + tcp_connection_tx_pacer_update (tc0); /* Switch state to ESTABLISHED */ tc0->state = TCP_STATE_ESTABLISHED; TCP_EVT (TCP_EVT_STATE_CHANGE, tc0); - tcp_check_tx_offload (tc0, is_ip4); + if (!(tc0->cfg_flags & TCP_CFG_F_NO_TSO)) + tcp_check_tx_offload (tc0, is_ip4); /* Initialize session variables */ tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; @@ -2771,11 +2234,13 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ - tcp_retransmit_timer_reset (tc0); + tcp_retransmit_timer_reset (&wrk->timer_wheel, tc0); if (session_stream_accept_notify (&tc0->connection)) { error0 = TCP_ERROR_MSG_QUEUE_FULL; - tcp_connection_reset (tc0); + tcp_send_reset (tc0); + session_transport_delete_notify (&tc0->connection); + tcp_connection_cleanup (tc0); goto drop; } error0 = TCP_ERROR_ACK_OK; @@ -2803,7 +2268,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_send_fin (tc0); /* If a fin was received and data was acked extend wait */ else if ((tc0->flags & TCP_CONN_FINRCVD) && tc0->bytes_acked) - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); } /* If FIN is ACKed */ @@ -2818,16 +2283,16 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (tc0->flags & TCP_CONN_FINRCVD) { tcp_connection_set_state (tc0, TCP_STATE_CLOSED); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, - tcp_cfg.cleanup_time); session_transport_closed_notify (&tc0->connection); + tcp_program_cleanup (wrk, tc0); goto drop; } tcp_connection_set_state (tc0, TCP_STATE_FIN_WAIT_2); /* Enable waitclose because we're willing to wait for peer's * FIN but not indefinitely. */ - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait2_time); + tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.finwait2_time); /* Don't try to deq the FIN acked */ if (tc0->burst_acked > 1) @@ -2860,7 +2325,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_send_fin (tc0); tcp_connection_timers_reset (tc0); tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time); + tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.lastack_time); break; case TCP_STATE_CLOSING: /* In addition to the processing for the ESTABLISHED state, if @@ -2874,7 +2340,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_connection_timers_reset (tc0); tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.timewait_time); + tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.timewait_time); session_transport_closed_notify (&tc0->connection); goto drop; @@ -2901,7 +2368,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, * 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_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); + tcp_program_cleanup (tcp_get_worker (tc0->c_thread_index), tc0); goto drop; @@ -2918,7 +2385,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, goto drop; tcp_program_ack (tc0); - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.timewait_time); + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.timewait_time); goto drop; break; @@ -2960,7 +2428,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_program_ack (tc0); tcp_connection_set_state (tc0, TCP_STATE_CLOSE_WAIT); tcp_program_disconnect (wrk, tc0); - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.closewait_time); break; case TCP_STATE_SYN_RCVD: /* Send FIN-ACK, enter LAST-ACK and because the app was not @@ -2970,7 +2439,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tc0->rcv_nxt += 1; tcp_send_fin (tc0); tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time); + tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.lastack_time); break; case TCP_STATE_CLOSE_WAIT: case TCP_STATE_CLOSING: @@ -2986,7 +2456,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, * sending it. Since we already received a fin, do not wait * for too long. */ tc0->flags |= TCP_CONN_FINRCVD; - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); } else @@ -2994,7 +2464,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_connection_set_state (tc0, TCP_STATE_CLOSING); tcp_program_ack (tc0); /* Wait for ACK for our FIN but not forever */ - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.closing_time); } break; @@ -3003,7 +2473,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tc0->rcv_nxt += 1; tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT); tcp_connection_timers_reset (tc0); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.timewait_time); + tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.timewait_time); tcp_program_ack (tc0); session_transport_closed_notify (&tc0->connection); break; @@ -3011,7 +2482,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Remain in the TIME-WAIT state. Restart the time-wait * timeout. */ - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.timewait_time); + tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, + tcp_cfg.timewait_time); break; } error0 = TCP_ERROR_FIN_RCVD; @@ -3096,39 +2568,46 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) { u32 n_left_from, *from, n_syns = 0, *first_buffer; - u32 my_thread_index = vm->thread_index; + u32 thread_index = vm->thread_index; from = first_buffer = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; while (n_left_from > 0) { - u32 bi0; - vlib_buffer_t *b0; - tcp_rx_trace_t *t0; - tcp_header_t *th0 = 0; - tcp_connection_t *lc0; - ip4_header_t *ip40; - ip6_header_t *ip60; - tcp_connection_t *child0; - u32 error0 = TCP_ERROR_NONE; + u32 bi, error = TCP_ERROR_NONE; + tcp_connection_t *lc, *child; + vlib_buffer_t *b; - bi0 = from[0]; + bi = from[0]; from += 1; n_left_from -= 1; - b0 = vlib_get_buffer (vm, bi0); - lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); + b = vlib_get_buffer (vm, bi); - if (is_ip4) + lc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index); + if (PREDICT_FALSE (lc == 0)) { - ip40 = vlib_buffer_get_current (b0); - th0 = ip4_next_header (ip40); + tcp_connection_t *tc; + tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, + thread_index); + if (tc->state != TCP_STATE_TIME_WAIT) + { + error = TCP_ERROR_CREATE_EXISTS; + goto done; + } + lc = tcp_lookup_listener (b, tc->c_fib_index, is_ip4); + /* clean up the old session */ + tcp_connection_del (tc); } - else + + /* Make sure connection wasn't just created */ + child = tcp_lookup_connection (lc->c_fib_index, b, thread_index, + is_ip4); + if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN)) { - ip60 = vlib_buffer_get_current (b0); - th0 = ip6_next_header (ip60); + error = TCP_ERROR_CREATE_EXISTS; + goto done; } /* Create child session. For syn-flood protection use filter */ @@ -3148,91 +2627,51 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* 3. check for a SYN (did that already) */ - /* Make sure connection wasn't just created */ - child0 = tcp_lookup_connection (lc0->c_fib_index, b0, my_thread_index, - is_ip4); - if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN)) - { - error0 = TCP_ERROR_CREATE_EXISTS; - goto drop; - } - /* Create child session and send SYN-ACK */ - child0 = tcp_connection_alloc (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->cc_algo = lc0->cc_algo; - - 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_fast (&child0->c_lcl_ip6, &ip60->dst_address, - sizeof (ip6_address_t)); - clib_memcpy_fast (&child0->c_rmt_ip6, &ip60->src_address, - sizeof (ip6_address_t)); - } + child = tcp_connection_alloc (thread_index); - if (tcp_options_parse (th0, &child0->rcv_opts, 1)) + if (tcp_options_parse (tcp_buffer_hdr (b), &child->rcv_opts, 1)) { - error0 = TCP_ERROR_OPTIONS; - tcp_connection_free (child0); - goto drop; + error = TCP_ERROR_OPTIONS; + tcp_connection_free (child); + goto done; } - 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]; + tcp_init_w_buffer (child, b, is_ip4); + + child->state = TCP_STATE_SYN_RCVD; + child->c_fib_index = lc->c_fib_index; + child->cc_algo = lc->cc_algo; + tcp_connection_init_vars (child); + child->rto = TCP_RTO_MIN; - /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} - * segments are used to initialize PAWS. */ - if (tcp_opts_tstamp (&child0->rcv_opts)) + if (session_stream_accept (&child->connection, lc->c_s_index, + lc->c_thread_index, 0 /* notify */ )) { - child0->tsval_recent = child0->rcv_opts.tsval; - child0->tsval_recent_age = tcp_time_now (); + tcp_connection_cleanup (child); + error = TCP_ERROR_CREATE_SESSION_FAIL; + goto done; } - if (tcp_opts_wscale (&child0->rcv_opts)) - child0->snd_wscale = child0->rcv_opts.wscale; - - 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; + child->tx_fifo_size = transport_tx_fifo_size (&child->connection); - tcp_connection_init_vars (child0); - child0->rto = TCP_RTO_MIN; - - if (session_stream_accept (&child0->connection, lc0->c_s_index, - lc0->c_thread_index, 0 /* notify */ )) - { - tcp_connection_cleanup (child0); - error0 = TCP_ERROR_CREATE_SESSION_FAIL; - goto drop; - } + tcp_send_synack (child); - TCP_EVT (TCP_EVT_SYN_RCVD, child0, 1); - child0->tx_fifo_size = transport_tx_fifo_size (&child0->connection); - tcp_send_synack (child0); + TCP_EVT (TCP_EVT_SYN_RCVD, child, 1); - drop: + done: - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) { - t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); - clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header)); - clib_memcpy_fast (&t0->tcp_connection, lc0, - sizeof (t0->tcp_connection)); + tcp_rx_trace_t *t; + t = vlib_add_trace (vm, node, b, sizeof (*t)); + clib_memcpy_fast (&t->tcp_header, tcp_buffer_hdr (b), + sizeof (t->tcp_header)); + clib_memcpy_fast (&t->tcp_connection, lc, + sizeof (t->tcp_connection)); } - n_syns += (error0 == TCP_ERROR_NONE); + n_syns += (error == TCP_ERROR_NONE); } tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); @@ -3364,125 +2803,27 @@ tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) } } -always_inline tcp_connection_t * -tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, - u8 is_ip4, u8 is_nolookup) -{ - 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 result = 0; - - if (is_ip4) - { - ip4_header_t *ip4 = vlib_buffer_get_current (b); - int ip_hdr_bytes = ip4_header_bytes (ip4); - if (PREDICT_FALSE (b->current_length < ip_hdr_bytes + sizeof (*tcp))) - { - *error = TCP_ERROR_LENGTH; - return 0; - } - tcp = ip4_next_header (ip4); - vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4; - n_advance_bytes = (ip_hdr_bytes + 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_data_bytes < 0)) - { - *error = TCP_ERROR_LENGTH; - return 0; - } - - if (!is_nolookup) - tc = session_lookup_connection_wt4 (fib_index, &ip4->dst_address, - &ip4->src_address, tcp->dst_port, - tcp->src_port, - TRANSPORT_PROTO_TCP, thread_index, - &result); - } - else - { - ip6_header_t *ip6 = vlib_buffer_get_current (b); - if (PREDICT_FALSE (b->current_length < sizeof (*ip6) + sizeof (*tcp))) - { - *error = TCP_ERROR_LENGTH; - return 0; - } - 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_data_bytes < 0)) - { - *error = TCP_ERROR_LENGTH; - return 0; - } - - if (!is_nolookup) - { - if (PREDICT_FALSE - (ip6_address_is_link_local_unicast (&ip6->dst_address))) - { - ip4_main_t *im = &ip4_main; - fib_index = vec_elt (im->fib_index_by_sw_if_index, - vnet_buffer (b)->sw_if_index[VLIB_RX]); - } - - tc = session_lookup_connection_wt6 (fib_index, &ip6->dst_address, - &ip6->src_address, - tcp->dst_port, tcp->src_port, - TRANSPORT_PROTO_TCP, - thread_index, &result); - } - } - - if (is_nolookup) - tc = - (transport_connection_t *) tcp_connection_get (vnet_buffer (b)-> - tcp.connection_index, - thread_index); - - 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.seq_end = vnet_buffer (b)->tcp.seq_number - + n_data_bytes; - vnet_buffer (b)->tcp.flags = 0; - - *error = result ? TCP_ERROR_NONE + result : *error; - - return tcp_get_connection_from_transport (tc); -} - static inline void tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc, - vlib_buffer_t * b, u16 * next, u32 * error) + vlib_buffer_t * b, u16 * next, + vlib_node_runtime_t * error_node) { tcp_header_t *tcp; + u32 error; u8 flags; tcp = tcp_buffer_hdr (b); flags = tcp->flags & filter_flags; *next = tm->dispatch_table[tc->state][flags].next; - *error = tm->dispatch_table[tc->state][flags].error; + error = tm->dispatch_table[tc->state][flags].error; tc->segs_in += 1; - if (PREDICT_FALSE (*error == TCP_ERROR_DISPATCH - || *next == TCP_INPUT_NEXT_RESET)) + if (PREDICT_FALSE (error != TCP_ERROR_NONE)) { - /* Overload tcp flags to store state */ - tcp_state_t state = tc->state; - vnet_buffer (b)->tcp.flags = tc->state; - - if (*error == TCP_ERROR_DISPATCH) + b->error = error_node->errors[error]; + if (error == TCP_ERROR_DISPATCH) clib_warning ("tcp conn %u disp error state %U flags %U", - tc->c_c_index, format_tcp_state, state, + tc->c_c_index, format_tcp_state, tc->state, format_tcp_flags, (int) flags); } } @@ -3527,34 +2868,40 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (PREDICT_TRUE (!tc0 + !tc1 == 0)) { - ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); - ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); + ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); + ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1]))); vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; - tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); - tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); + tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node); } else { if (PREDICT_TRUE (tc0 != 0)) { - ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); + ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; - tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); } else - tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); + { + tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); + b[0]->error = node->errors[error0]; + } if (PREDICT_TRUE (tc1 != 0)) { - ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); + ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1]))); vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; - tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); + tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node); } else - tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); + { + tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); + b[1]->error = node->errors[error1]; + } } b += 2; @@ -3577,12 +2924,15 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, is_nolookup); if (PREDICT_TRUE (tc0 != 0)) { - ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); + ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; - tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); + tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); } else - tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); + { + tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); + b[0]->error = node->errors[error0]; + } b += 1; next += 1; @@ -3743,7 +3093,7 @@ do { \ _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, - TCP_ERROR_NONE); + TCP_ERROR_SEGMENT_INVALID); _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, @@ -3916,7 +3266,7 @@ do { \ TCP_ERROR_NONE); _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); - _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); + _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); @@ -3930,10 +3280,10 @@ do { \ _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); - _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); - _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); + _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); + _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, - TCP_ERROR_NONE); + TCP_ERROR_CONNECTION_CLOSED); #undef _ }