X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp_input.c;h=62dcdc5e7110acd82d08f2ecd7687a546a5f1b1d;hb=84275e96559ced02d456cb8b034237d5782b9693;hp=29f4f08d72c14c090d77343db7ca9f3811f2bef5;hpb=66b11318a1e5f24880e3ec77c95d70647732a4a8;p=vpp.git diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index 29f4f08d72c..62dcdc5e711 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -248,8 +248,8 @@ tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) * then the TSval from the segment is copied to TS.Recent; * otherwise, the TSval is ignored. */ - if (tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent - && seq_leq (seq, tc->rcv_las) && seq_leq (tc->rcv_las, seq_end)) + 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; @@ -275,6 +275,7 @@ tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0, if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts))) { + clib_warning ("options parse error"); return -1; } @@ -350,9 +351,17 @@ tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0, if (tcp_syn (th0)) { /* TODO implement RFC 5961 */ - tcp_make_ack (tc0, b0); + if (tc0->state == TCP_STATE_SYN_RCVD) + { + tcp_make_synack (tc0, b0); + TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); + } + else + { + tcp_make_ack (tc0, b0); + TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0); + } *next0 = tcp_next_output (tc0->c_is_ip4); - TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0); return -1; } @@ -409,51 +418,53 @@ tcp_update_rto (tcp_connection_t * tc) tc->rto = clib_max (tc->rto, TCP_RTO_MIN); } -/** Update RTT estimate and RTO timer +/** + * 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 tcp_update_rtt (tcp_connection_t * tc, u32 ack) { u32 mrtt = 0; - u8 rtx_acked; - - /* Determine if only rtx bytes are acked. */ - rtx_acked = tcp_in_cong_recovery (tc) || !tc->bytes_acked; /* Karn's rule, part 1. Don't use retransmitted segments to estimate * RTT because they're ambiguous. */ - if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq) && !rtx_acked) + if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) + goto done; + + if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) { mrtt = tcp_time_now () - tc->rtt_ts; } /* 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). */ - else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.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->rcv_opts.tsecr; } - /* Allow measuring of a new RTT */ - tc->rtt_ts = 0; - - /* If ACK moves left side of the wnd make sure boff is 0, even if mrtt is - * not valid */ - if (tc->bytes_acked) - tc->rto_boff = 0; - /* Ignore dubious measurements */ if (mrtt == 0 || mrtt > TCP_RTT_MAX) - return 0; + goto done; tcp_estimate_rtt (tc, mrtt); + +done: + + /* Allow measuring of a new RTT */ + tc->rtt_ts = 0; + + /* If we got here something must've been ACKed so make sure boff is 0, + * even if mrrt is not valid since we update the rto lower */ + tc->rto_boff = 0; tcp_update_rto (tc); return 0; @@ -492,14 +503,6 @@ tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, && (prev_snd_wnd == tc->snd_wnd)); } -static u8 -tcp_is_lost_fin (tcp_connection_t * tc) -{ - if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1) - return 1; - return 0; -} - /** * Checks if ack is a congestion control event. */ @@ -931,10 +934,12 @@ static void tcp_cc_recovery_exit (tcp_connection_t * tc) { /* Deflate rto */ - tcp_update_rto (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); } void @@ -943,8 +948,10 @@ tcp_cc_fastrecovery_exit (tcp_connection_t * tc) tc->cc_algo->recovered (tc); tc->snd_rxt_bytes = 0; tc->rcv_dupacks = 0; + tc->snd_nxt = tc->snd_una_max; tcp_fastrecovery_off (tc); tcp_fastrecovery_1_smss_off (tc); + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); } static void @@ -957,13 +964,14 @@ tcp_cc_congestion_undo (tcp_connection_t * tc) if (tcp_in_recovery (tc)) tcp_cc_recovery_exit (tc); ASSERT (tc->rto_boff == 0); + TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5); /* TODO extend for fastrecovery */ } static u8 tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) { - return (tcp_in_recovery (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)); @@ -987,7 +995,6 @@ tcp_cc_recover (tcp_connection_t * tc) ASSERT (tc->rto_boff == 0); ASSERT (!tcp_in_cong_recovery (tc)); ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); - TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); return 0; } @@ -1162,7 +1169,8 @@ partial_ack: /* Remove retransmitted bytes that have been delivered */ ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv - >= tc->sack_sb.last_bytes_delivered); + >= tc->sack_sb.last_bytes_delivered + || (tc->flags & TCP_CONN_FINSNT)); if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt)) { @@ -1273,6 +1281,8 @@ tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b, 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; TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1); return vnet_buffer (b)->tcp.data_len ? 0 : -1; @@ -1368,7 +1378,7 @@ always_inline int tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, u16 data_len) { - int written; + int written, error = TCP_ERROR_ENQUEUED; ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); @@ -1386,12 +1396,12 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, /* 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; + tc->rcv_nxt += written; /* Send ACK confirming the update */ tc->flags |= TCP_CONN_SNDACK; @@ -1405,7 +1415,7 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, * not be enqueued. Inform peer */ tc->flags |= TCP_CONN_SNDACK; - return TCP_ERROR_PARTIALLY_ENQUEUED; + error = TCP_ERROR_PARTIALLY_ENQUEUED; } else { @@ -1420,7 +1430,7 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); } - return TCP_ERROR_ENQUEUED; + return error; } /** Enqueue out-of-order data */ @@ -1497,6 +1507,34 @@ tcp_can_delack (tcp_connection_t * tc) 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; +} + static int tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b, u32 * next0) @@ -1530,7 +1568,8 @@ tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b, 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; - vlib_buffer_advance (b, n_bytes_to_drop); + if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) + goto done; goto in_order; } @@ -1719,18 +1758,17 @@ tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* 8: check the FIN bit */ if (PREDICT_FALSE (is_fin)) { - /* Enter CLOSE-WAIT and notify session. Don't send ACK, instead - * wait for session to call close. To avoid lingering + /* Enter CLOSE-WAIT and notify session. To avoid lingering * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ - tc0->state = TCP_STATE_CLOSE_WAIT; - TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); + /* Account for the FIN if nothing else was received */ if (vnet_buffer (b0)->tcp.data_len == 0) - { - tc0->rcv_nxt += 1; - next0 = TCP_ESTABLISHED_NEXT_DROP; - } + tc0->rcv_nxt += 1; + tcp_make_ack (tc0, b0); + next0 = tcp_next_output (tc0->c_is_ip4); + tc0->state = TCP_STATE_CLOSE_WAIT; stream_session_disconnect_notify (&tc0->connection); tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); + TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); } done: @@ -1818,6 +1856,74 @@ VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established); vlib_node_registration_t tcp4_syn_sent_node; vlib_node_registration_t tcp6_syn_sent_node; +static u8 +tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) +{ + transport_connection_t *tmp; + if (!tc) + return 1; + + u8 is_valid = (tc->c_lcl_port == hdr->dst_port + && (tc->state == TCP_STATE_LISTEN + || tc->c_rmt_port == hdr->src_port)); + + if (!is_valid) + { + if ((tmp = + stream_session_half_open_lookup (&tc->c_lcl_ip, &tc->c_rmt_ip, + tc->c_lcl_port, tc->c_rmt_port, + tc->c_transport_proto))) + { + if (tmp->lcl_port == hdr->dst_port + && tmp->rmt_port == hdr->src_port) + { + clib_warning ("half-open is valid!"); + } + } + } + return is_valid; +} + +/** + * Lookup transport connection + */ +static tcp_connection_t * +tcp_lookup_connection (vlib_buffer_t * b, u8 thread_index, u8 is_ip4) +{ + tcp_header_t *tcp; + transport_connection_t *tconn; + tcp_connection_t *tc; + if (is_ip4) + { + ip4_header_t *ip4; + ip4 = vlib_buffer_get_current (b); + tcp = ip4_next_header (ip4); + tconn = stream_session_lookup_transport_wt4 (&ip4->dst_address, + &ip4->src_address, + tcp->dst_port, + tcp->src_port, + SESSION_TYPE_IP4_TCP, + thread_index); + 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 = stream_session_lookup_transport_wt6 (&ip6->dst_address, + &ip6->src_address, + tcp->dst_port, + tcp->src_port, + SESSION_TYPE_IP6_TCP, + thread_index); + tc = tcp_get_connection_from_transport (tconn); + ASSERT (tcp_lookup_is_valid (tc, tcp)); + } + return tc; +} + always_inline uword tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) @@ -1858,26 +1964,31 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tc0 = tcp_half_open_connection_get (vnet_buffer (b0)-> tcp.connection_index); + if (PREDICT_FALSE (tc0 == 0)) + { + error0 = TCP_ERROR_INVALID_CONNECTION; + goto drop; + } + + /* Half-open completed recently but the connection was't removed + * yet by the owning thread */ + if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) + { + /* Make sure the connection actually exists */ + ASSERT (tcp_lookup_connection (b0, my_thread_index, is_ip4)); + goto drop; + } ack0 = vnet_buffer (b0)->tcp.ack_number; seq0 = vnet_buffer (b0)->tcp.seq_number; tcp0 = tcp_buffer_hdr (b0); - if (!tc0) - { - ip4_header_t *ip40 = vlib_buffer_get_current (b0); - tcp0 = ip4_next_header (ip40); - tc0 = - (tcp_connection_t *) - stream_session_lookup_transport_wt4 (&ip40->dst_address, - &ip40->src_address, - tcp0->dst_port, - tcp0->src_port, - SESSION_TYPE_IP4_TCP, - my_thread_index); - ASSERT (0); - goto drop; - } + /* Crude check to see if the connection handle does not match + * the packet. Probably connection just switched to established */ + if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port + || tcp0->src_port != tc0->c_rmt_port)) + goto drop; + if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0))) goto drop; @@ -1900,16 +2011,20 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, */ if (tcp_ack (tcp0)) { - if (ack0 <= tc0->iss || ack0 > tc0->snd_nxt) + if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) { + clib_warning ("ack not in rcv wnd"); if (!tcp_rst (tcp0)) - tcp_send_reset (tc0, b0, is_ip4); + tcp_send_reset_w_pkt (tc0, b0, is_ip4); goto drop; } /* Make sure ACK is valid */ - if (tc0->snd_una > ack0) - goto drop; + if (seq_gt (tc0->snd_una, ack0)) + { + clib_warning ("ack invalid"); + goto drop; + } } /* @@ -1935,11 +2050,17 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* No SYN flag. Drop. */ if (!tcp_syn (tcp0)) - goto drop; + { + clib_warning ("not synack"); + goto drop; + } /* Parse options */ if (tcp_options_parse (tcp0, &tc0->rcv_opts)) - goto drop; + { + clib_warning ("options parse fail"); + goto drop; + } /* Valid SYN or SYN-ACK. Move connection from half-open pool to * current thread pool. */ @@ -1967,8 +2088,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (tcp_opts_wscale (&new_tc0->rcv_opts)) new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; - new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) - << new_tc0->snd_wscale; + /* RFC1323: SYN and SYN-ACK wnd not scaled */ + new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window); new_tc0->snd_wl1 = seq0; new_tc0->snd_wl2 = ack0; @@ -1990,7 +2111,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, * allocate session send reset */ if (stream_session_connect_notify (&new_tc0->connection, 0)) { - tcp_send_reset (new_tc0, b0, is_ip4); + clib_warning ("connect notify fail"); + tcp_send_reset_w_pkt (new_tc0, b0, is_ip4); tcp_connection_cleanup (new_tc0); goto drop; } @@ -1999,7 +2121,6 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, new_tc0->flags |= TCP_CONN_SNDACK; /* Update rtt with the syn-ack sample */ - new_tc0->bytes_acked = 1; tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number); TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0); } @@ -2012,12 +2133,13 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (stream_session_connect_notify (&new_tc0->connection, 0)) { tcp_connection_cleanup (new_tc0); - tcp_send_reset (tc0, b0, is_ip4); + tcp_send_reset_w_pkt (tc0, b0, is_ip4); TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0); goto drop; } tc0->rtt_ts = 0; + tcp_init_snd_vars (tc0); tcp_make_synack (new_tc0, b0); next0 = tcp_next_output (is_ip4); @@ -2158,6 +2280,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tcp_header_t *tcp0 = 0; tcp_connection_t *tc0; u32 next0 = TCP_RCV_PROCESS_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; + u8 is_fin0; bi0 = from[0]; to_next[0] = bi0; @@ -2176,11 +2299,23 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } tcp0 = tcp_buffer_hdr (b0); + is_fin0 = tcp_is_fin (tcp0); /* 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) - + vnet_buffer (b0)->tcp.data_len; + + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len; + + if (CLIB_DEBUG) + { + tcp_connection_t *tmp; + tmp = tcp_lookup_connection (b0, my_thread_index, is_ip4); + if (tmp->state != tc0->state) + { + clib_warning ("state changed"); + ASSERT (0); + goto drop; + } + } /* * Special treatment for CLOSED @@ -2197,8 +2332,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, */ /* 1-4: check SEQ, RST, SYN */ - if (PREDICT_FALSE - (tcp_segment_validate (vm, tc0, b0, tcp0, &next0))) + if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0, + &next0))) { error0 = TCP_ERROR_SEGMENT_INVALID; goto drop; @@ -2216,12 +2351,12 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, */ if (!tcp_rcv_ack_is_acceptable (tc0, b0)) { - tcp_send_reset (tc0, b0, is_ip4); + clib_warning ("connection not accepted"); + tcp_send_reset_w_pkt (tc0, b0, is_ip4); goto drop; } /* Update rtt and rto */ - tc0->bytes_acked = 1; tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number); /* Switch state to ESTABLISHED */ @@ -2235,8 +2370,10 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; stream_session_accept_notify (&tc0->connection); - /* Reset SYN-ACK retransmit timer */ + /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ tcp_retransmit_timer_reset (tc0); + tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); + TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); break; case TCP_STATE_ESTABLISHED: /* We can get packets in established state here because they @@ -2252,16 +2389,24 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) goto drop; + /* Still have to send the FIN */ + if (tc0->flags & TCP_CONN_FINPNDG) + { + /* TX fifo finally drained */ + if (!stream_session_tx_fifo_max_dequeue (&tc0->connection)) + tcp_send_fin (tc0); + } /* If FIN is ACKed */ - if (tc0->snd_una == tc0->snd_una_max) + else if (tc0->snd_una == tc0->snd_una_max) { - ASSERT (tcp_fin (tcp0)); - tc0->rcv_nxt += 1; tc0->state = TCP_STATE_FIN_WAIT_2; TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); - /* Stop all timers, 2MSL will be set lower */ + /* 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: @@ -2270,8 +2415,6 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, * 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. */ @@ -2285,9 +2428,9 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) goto drop; - /* XXX test that send queue empty */ tc0->state = TCP_STATE_TIME_WAIT; TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); goto drop; break; @@ -2299,10 +2442,10 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (!tcp_rcv_ack_is_acceptable (tc0, b0)) goto drop; + tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; /* Apparently our FIN was lost */ - if (tcp_fin (tcp0)) + if (is_fin0) { - /* Don't "make" fin since that increments snd_nxt */ tcp_send_fin (tc0); goto drop; } @@ -2315,8 +2458,6 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, * 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); - - /* Stop retransmit */ tcp_retransmit_timer_reset (tc0); goto drop; @@ -2331,8 +2472,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, goto drop; tcp_make_ack (tc0, b0); - tcp_timer_reset (tc0, TCP_TIMER_WAITCLOSE); - tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); goto drop; @@ -2351,6 +2491,8 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, case TCP_STATE_FIN_WAIT_2: if (vnet_buffer (b0)->tcp.data_len) error0 = tcp_segment_rcv (tm, tc0, b0, &next0); + else if (is_fin0) + tc0->rcv_nxt += 1; break; case TCP_STATE_CLOSE_WAIT: case TCP_STATE_CLOSING: @@ -2362,7 +2504,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } /* 8: check the FIN bit */ - if (!tcp_fin (tcp0)) + if (!is_fin0) goto drop; switch (tc0->state) @@ -2372,6 +2514,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Send FIN-ACK notify app and enter CLOSE-WAIT */ tcp_connection_timers_reset (tc0); tcp_make_fin (tc0, b0); + tc0->snd_nxt += 1; next0 = tcp_next_output (tc0->c_is_ip4); stream_session_disconnect_notify (&tc0->connection); tc0->state = TCP_STATE_CLOSE_WAIT; @@ -2383,25 +2526,27 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* 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); + tc0->state = TCP_STATE_CLOSING; + tcp_make_ack (tc0, b0); + next0 = tcp_next_output (is_ip4); TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); + /* Wait for ACK but not forever */ + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); break; case TCP_STATE_FIN_WAIT_2: - /* Got FIN, send ACK! */ + /* 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_CLOSEWAIT_TIME); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); tcp_make_ack (tc0, b0); next0 = tcp_next_output (is_ip4); TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); break; case TCP_STATE_TIME_WAIT: - /* Remain in the TIME-WAIT state. Restart the 2 MSL time-wait + /* Remain in the TIME-WAIT state. Restart the time-wait * timeout. */ - tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); + tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); break; } TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); @@ -2568,6 +2713,14 @@ 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 (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_new (my_thread_index); child0->c_lcl_port = lc0->c_lcl_port; @@ -2591,12 +2744,15 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (stream_session_accept (&child0->connection, lc0->c_s_index, sst, 0 /* notify */ )) { + clib_warning ("session accept fail"); + tcp_connection_cleanup (child0); error0 = TCP_ERROR_CREATE_SESSION_FAIL; goto drop; } if (tcp_options_parse (th0, &child0->rcv_opts)) { + clib_warning ("options parse fail"); goto drop; } @@ -2621,11 +2777,12 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; tcp_connection_init_vars (child0); - TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0); + TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1); /* Reuse buffer to make syn-ack and send */ tcp_make_synack (child0, b0); next0 = tcp_next_output (is_ip4); + tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME); drop: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) @@ -2716,6 +2873,7 @@ 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; @@ -2725,7 +2883,8 @@ typedef enum _tcp_input_next _ (RCV_PROCESS, "tcp4-rcv-process") \ _ (SYN_SENT, "tcp4-syn-sent") \ _ (ESTABLISHED, "tcp4-established") \ - _ (RESET, "tcp4-reset") + _ (RESET, "tcp4-reset") \ + _ (PUNT, "error-punt") #define foreach_tcp6_input_next \ _ (DROP, "error-drop") \ @@ -2733,38 +2892,11 @@ typedef enum _tcp_input_next _ (RCV_PROCESS, "tcp6-rcv-process") \ _ (SYN_SENT, "tcp6-syn-sent") \ _ (ESTABLISHED, "tcp6-established") \ - _ (RESET, "tcp6-reset") + _ (RESET, "tcp6-reset") \ + _ (PUNT, "error-punt") #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) -static u8 -tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) -{ - transport_connection_t *tmp; - if (!tc) - return 1; - - u8 is_valid = (tc->c_lcl_port == hdr->dst_port - && (tc->state == TCP_STATE_LISTEN - || tc->c_rmt_port == hdr->src_port)); - - if (!is_valid) - { - if ((tmp = - stream_session_half_open_lookup (&tc->c_lcl_ip, &tc->c_rmt_ip, - tc->c_lcl_port, tc->c_rmt_port, - tc->c_transport_proto))) - { - if (tmp->lcl_port == hdr->dst_port - && tmp->rmt_port == hdr->src_port) - { - clib_warning ("half-open is valid!"); - } - } - } - return is_valid; -} - always_inline uword tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) @@ -2775,8 +2907,8 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; - next_index = node->cached_next_index; + tcp_set_time_now (my_thread_index); while (n_left_from > 0) { @@ -2791,6 +2923,7 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t *b0; tcp_header_t *tcp0 = 0; tcp_connection_t *tc0; + transport_connection_t *tconn; ip4_header_t *ip40; ip6_header_t *ip60; u32 error0 = TCP_ERROR_NO_LISTENER, next0 = TCP_INPUT_NEXT_DROP; @@ -2816,15 +2949,13 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + tcp_header_bytes (tcp0)); n_data_bytes0 = clib_net_to_host_u16 (ip40->length) - n_advance_bytes0; - - tc0 = - (tcp_connection_t *) - stream_session_lookup_transport_wt4 (&ip40->dst_address, - &ip40->src_address, - tcp0->dst_port, - tcp0->src_port, - SESSION_TYPE_IP4_TCP, - my_thread_index); + tconn = stream_session_lookup_transport_wt4 (&ip40->dst_address, + &ip40->src_address, + tcp0->dst_port, + tcp0->src_port, + SESSION_TYPE_IP4_TCP, + my_thread_index); + tc0 = tcp_get_connection_from_transport (tconn); ASSERT (tcp_lookup_is_valid (tc0, tcp0)); } else @@ -2835,15 +2966,13 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length) - n_advance_bytes0; n_advance_bytes0 += sizeof (ip60[0]); - - tc0 = - (tcp_connection_t *) - stream_session_lookup_transport_wt6 (&ip60->dst_address, - &ip60->src_address, - tcp0->dst_port, - tcp0->src_port, - SESSION_TYPE_IP6_TCP, - my_thread_index); + tconn = stream_session_lookup_transport_wt6 (&ip60->dst_address, + &ip60->src_address, + tcp0->dst_port, + tcp0->src_port, + SESSION_TYPE_IP6_TCP, + my_thread_index); + tc0 = tcp_get_connection_from_transport (tconn); ASSERT (tcp_lookup_is_valid (tc0, tcp0)); } @@ -2888,9 +3017,18 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } else { - /* Send reset */ - next0 = TCP_INPUT_NEXT_RESET; - error0 = TCP_ERROR_NO_LISTENER; + if ((is_ip4 && tm->punt_unknown4) || + (!is_ip4 && tm->punt_unknown6)) + { + next0 = TCP_INPUT_NEXT_PUNT; + error0 = TCP_ERROR_PUNT; + } + else + { + /* Send reset */ + next0 = TCP_INPUT_NEXT_RESET; + error0 = TCP_ERROR_NO_LISTENER; + } } done: @@ -3042,9 +3180,10 @@ do { \ _(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); - _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); + _(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_RESET, + _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); #undef _ }