Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1 | /* |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 2 | * Copyright (c) 2016-2019 Cisco and/or its affiliates. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | * you may not use this file except in compliance with the License. |
| 5 | * You may obtain a copy of the License at: |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software |
| 10 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | * See the License for the specific language governing permissions and |
| 13 | * limitations under the License. |
| 14 | */ |
| 15 | |
| 16 | #include <vppinfra/sparse_vec.h> |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 17 | #include <vnet/fib/ip4_fib.h> |
| 18 | #include <vnet/fib/ip6_fib.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 19 | #include <vnet/tcp/tcp.h> |
Florin Coras | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 20 | #include <vnet/tcp/tcp_inlines.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 21 | #include <vnet/session/session.h> |
| 22 | #include <math.h> |
| 23 | |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 24 | static vlib_error_desc_t tcp_input_error_counters[] = { |
| 25 | #define tcp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s }, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 26 | #include <vnet/tcp/tcp_error.def> |
| 27 | #undef tcp_error |
| 28 | }; |
| 29 | |
Filip Tehlar | bc4dc16 | 2023-04-17 12:22:12 +0200 | [diff] [blame] | 30 | typedef enum _tcp_input_next |
| 31 | { |
| 32 | TCP_INPUT_NEXT_DROP, |
| 33 | TCP_INPUT_NEXT_LISTEN, |
| 34 | TCP_INPUT_NEXT_RCV_PROCESS, |
| 35 | TCP_INPUT_NEXT_SYN_SENT, |
| 36 | TCP_INPUT_NEXT_ESTABLISHED, |
| 37 | TCP_INPUT_NEXT_RESET, |
| 38 | TCP_INPUT_NEXT_PUNT, |
| 39 | TCP_INPUT_N_NEXT |
| 40 | } tcp_input_next_t; |
| 41 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 42 | /** |
| 43 | * Validate segment sequence number. As per RFC793: |
| 44 | * |
| 45 | * Segment Receive Test |
| 46 | * Length Window |
| 47 | * ------- ------- ------------------------------------------- |
| 48 | * 0 0 SEG.SEQ = RCV.NXT |
| 49 | * 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 50 | * >0 0 not acceptable |
| 51 | * >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 52 | * or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND |
| 53 | * |
| 54 | * This ultimately consists in checking if segment falls within the window. |
| 55 | * The one important difference compared to RFC793 is that we use rcv_las, |
| 56 | * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the |
| 57 | * peer's reference when computing our receive window. |
| 58 | * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 59 | * This: |
| 60 | * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) |
| 61 | * however, is too strict when we have retransmits. Instead we just check that |
| 62 | * the seq is not beyond the right edge and that the end of the segment is not |
| 63 | * less than the left edge. |
| 64 | * |
| 65 | * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so |
| 66 | * use rcv_nxt in the right edge window test instead of rcv_las. |
| 67 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 68 | */ |
| 69 | always_inline u8 |
| 70 | tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) |
| 71 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 72 | return (seq_geq (end_seq, tc->rcv_las) |
| 73 | && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 74 | } |
| 75 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 76 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 77 | * RFC1323: Check against wrapped sequence numbers (PAWS). If we have |
| 78 | * timestamp to echo and it's less than tsval_recent, drop segment |
| 79 | * but still send an ACK in order to retain TCP's mechanism for detecting |
| 80 | * and recovering from half-open connections |
| 81 | * |
| 82 | * Or at least that's what the theory says. It seems that this might not work |
| 83 | * very well with packet reordering and fast retransmit. XXX |
| 84 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 85 | always_inline int |
| 86 | tcp_segment_check_paws (tcp_connection_t * tc) |
| 87 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 88 | return tcp_opts_tstamp (&tc->rcv_opts) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 89 | && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 93 | * Update tsval recent |
| 94 | */ |
| 95 | always_inline void |
| 96 | tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) |
| 97 | { |
| 98 | /* |
| 99 | * RFC1323: If Last.ACK.sent falls within the range of sequence numbers |
| 100 | * of an incoming segment: |
| 101 | * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN |
| 102 | * then the TSval from the segment is copied to TS.Recent; |
| 103 | * otherwise, the TSval is ignored. |
| 104 | */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 105 | if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) |
| 106 | && seq_leq (tc->rcv_las, seq_end)) |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 107 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 108 | ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 109 | tc->tsval_recent = tc->rcv_opts.tsval; |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame] | 110 | tc->tsval_recent_age = tcp_time_tstamp (tc->c_thread_index); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 111 | } |
| 112 | } |
| 113 | |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 114 | static void |
| 115 | tcp_handle_rst (tcp_connection_t * tc) |
| 116 | { |
| 117 | switch (tc->rst_state) |
| 118 | { |
| 119 | case TCP_STATE_SYN_RCVD: |
| 120 | /* Cleanup everything. App wasn't notified yet */ |
| 121 | session_transport_delete_notify (&tc->connection); |
| 122 | tcp_connection_cleanup (tc); |
| 123 | break; |
| 124 | case TCP_STATE_SYN_SENT: |
Florin Coras | 67fe778 | 2020-09-02 10:51:10 -0700 | [diff] [blame] | 125 | session_stream_connect_notify (&tc->connection, SESSION_E_REFUSED); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 126 | tcp_connection_cleanup (tc); |
| 127 | break; |
| 128 | case TCP_STATE_ESTABLISHED: |
| 129 | session_transport_reset_notify (&tc->connection); |
| 130 | session_transport_closed_notify (&tc->connection); |
| 131 | break; |
| 132 | case TCP_STATE_CLOSE_WAIT: |
| 133 | case TCP_STATE_FIN_WAIT_1: |
| 134 | case TCP_STATE_FIN_WAIT_2: |
| 135 | case TCP_STATE_CLOSING: |
| 136 | case TCP_STATE_LAST_ACK: |
| 137 | session_transport_closed_notify (&tc->connection); |
| 138 | break; |
| 139 | case TCP_STATE_CLOSED: |
| 140 | case TCP_STATE_TIME_WAIT: |
| 141 | break; |
| 142 | default: |
| 143 | TCP_DBG ("reset state: %u", tc->state); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | static void |
| 148 | tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 149 | { |
| 150 | if (!tcp_disconnect_pending (tc)) |
| 151 | { |
| 152 | tc->rst_state = tc->state; |
| 153 | vec_add1 (wrk->pending_resets, tc->c_c_index); |
| 154 | tcp_disconnect_pending_on (tc); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Handle reset packet |
| 160 | * |
| 161 | * Programs disconnect/reset notification that should be sent |
| 162 | * later by calling @ref tcp_handle_disconnects |
| 163 | */ |
| 164 | static void |
| 165 | tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 166 | { |
| 167 | TCP_EVT (TCP_EVT_RST_RCVD, tc); |
| 168 | switch (tc->state) |
| 169 | { |
| 170 | case TCP_STATE_SYN_RCVD: |
| 171 | tcp_program_reset_ntf (wrk, tc); |
| 172 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 173 | break; |
| 174 | case TCP_STATE_SYN_SENT: |
Florin Coras | 96acc9b | 2020-02-18 22:51:26 +0000 | [diff] [blame] | 175 | /* Do not program ntf because the connection is half-open */ |
Ivan Shvedunov | e52eafd | 2020-07-29 19:15:41 +0300 | [diff] [blame] | 176 | tc->rst_state = tc->state; |
Florin Coras | 96acc9b | 2020-02-18 22:51:26 +0000 | [diff] [blame] | 177 | tcp_handle_rst (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 178 | break; |
| 179 | case TCP_STATE_ESTABLISHED: |
| 180 | tcp_connection_timers_reset (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 181 | tcp_cong_recovery_off (tc); |
| 182 | tcp_program_reset_ntf (wrk, tc); |
| 183 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 184 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 185 | break; |
| 186 | case TCP_STATE_CLOSE_WAIT: |
| 187 | case TCP_STATE_FIN_WAIT_1: |
| 188 | case TCP_STATE_FIN_WAIT_2: |
| 189 | case TCP_STATE_CLOSING: |
| 190 | case TCP_STATE_LAST_ACK: |
| 191 | tcp_connection_timers_reset (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 192 | tcp_cong_recovery_off (tc); |
| 193 | tcp_program_reset_ntf (wrk, tc); |
| 194 | /* Make sure we mark the session as closed. In some states we may |
| 195 | * be still trying to send data */ |
| 196 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 197 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 198 | break; |
| 199 | case TCP_STATE_CLOSED: |
| 200 | case TCP_STATE_TIME_WAIT: |
| 201 | break; |
| 202 | default: |
| 203 | TCP_DBG ("reset state: %u", tc->state); |
| 204 | } |
| 205 | } |
| 206 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 207 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 208 | * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 |
| 209 | * |
| 210 | * It first verifies if segment has a wrapped sequence number (PAWS) and then |
| 211 | * does the processing associated to the first four steps (ignoring security |
| 212 | * and precedence): sequence number, rst bit and syn bit checks. |
| 213 | * |
| 214 | * @return 0 if segments passes validation. |
| 215 | */ |
| 216 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 217 | tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, |
| 218 | vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 219 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 220 | /* We could get a burst of RSTs interleaved with acks */ |
| 221 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 222 | { |
| 223 | tcp_send_reset (tc0); |
| 224 | *error0 = TCP_ERROR_CONNECTION_CLOSED; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 225 | goto error; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 228 | if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 229 | { |
| 230 | *error0 = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 231 | goto error; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 232 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 233 | |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 234 | if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0))) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 235 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 236 | *error0 = TCP_ERROR_OPTIONS; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 237 | goto error; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 238 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 239 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 240 | if (PREDICT_FALSE (tcp_segment_check_paws (tc0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 241 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 242 | *error0 = TCP_ERROR_PAWS; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 243 | TCP_EVT (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, |
| 244 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 245 | |
| 246 | /* If it just so happens that a segment updates tsval_recent for a |
| 247 | * segment over 24 days old, invalidate tsval_recent. */ |
| 248 | if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame] | 249 | tcp_time_tstamp (tc0->c_thread_index))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 250 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 251 | tc0->tsval_recent = tc0->rcv_opts.tsval; |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 252 | clib_warning ("paws failed: 24-day old segment"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 253 | } |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 254 | /* Drop after ack if not rst. Resets can fail paws check as per |
| 255 | * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT |
| 256 | * be subjected to the PAWS check by verifying an acceptable value in |
| 257 | * SEG.TSval */ |
| 258 | else if (!tcp_rst (th0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 259 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 260 | tcp_program_ack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 261 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 262 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 263 | } |
| 264 | } |
| 265 | |
| 266 | /* 1st: check sequence number */ |
| 267 | if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 268 | vnet_buffer (b0)->tcp.seq_end)) |
| 269 | { |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 270 | /* SYN/SYN-ACK retransmit */ |
| 271 | if (tcp_syn (th0) |
| 272 | && vnet_buffer (b0)->tcp.seq_number == tc0->rcv_nxt - 1) |
| 273 | { |
| 274 | tcp_options_parse (th0, &tc0->rcv_opts, 1); |
| 275 | if (tc0->state == TCP_STATE_SYN_RCVD) |
| 276 | { |
| 277 | tcp_send_synack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 278 | TCP_EVT (TCP_EVT_SYN_RCVD, tc0, 0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 279 | *error0 = TCP_ERROR_SYNS_RCVD; |
| 280 | } |
| 281 | else |
| 282 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 283 | tcp_program_ack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 284 | TCP_EVT (TCP_EVT_SYNACK_RCVD, tc0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 285 | *error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 286 | } |
| 287 | goto error; |
| 288 | } |
| 289 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 290 | /* If our window is 0 and the packet is in sequence, let it pass |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 291 | * through for ack processing. It should be dropped later. */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 292 | if (tc0->rcv_wnd < tc0->snd_mss |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 293 | && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number) |
| 294 | goto check_reset; |
| 295 | |
| 296 | /* If we entered recovery and peer did so as well, there's a chance that |
| 297 | * dup acks won't be acceptable on either end because seq_end may be less |
| 298 | * than rcv_las. This can happen if acks are lost in both directions. */ |
| 299 | if (tcp_in_recovery (tc0) |
| 300 | && seq_geq (vnet_buffer (b0)->tcp.seq_number, |
| 301 | tc0->rcv_las - tc0->rcv_wnd) |
| 302 | && seq_leq (vnet_buffer (b0)->tcp.seq_end, |
| 303 | tc0->rcv_nxt + tc0->rcv_wnd)) |
| 304 | goto check_reset; |
| 305 | |
| 306 | *error0 = TCP_ERROR_RCV_WND; |
| 307 | |
Florin Coras | a495a3e | 2019-08-29 18:33:24 -0700 | [diff] [blame] | 308 | /* If we advertised a zero rcv_wnd and the segment is in the past or the |
| 309 | * next one that we expect, it is probably a window probe */ |
| 310 | if ((tc0->flags & TCP_CONN_ZERO_RWND_SENT) |
| 311 | && seq_lt (vnet_buffer (b0)->tcp.seq_end, |
| 312 | tc0->rcv_las + tc0->rcv_opts.mss)) |
| 313 | *error0 = TCP_ERROR_ZERO_RWND; |
| 314 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 315 | tc0->errors.below_data_wnd += seq_lt (vnet_buffer (b0)->tcp.seq_end, |
| 316 | tc0->rcv_las); |
| 317 | |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 318 | /* If not RST, send dup ack */ |
| 319 | if (!tcp_rst (th0)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 320 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 321 | tcp_program_dupack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 322 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 323 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 324 | goto error; |
| 325 | |
| 326 | check_reset: |
| 327 | ; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /* 2nd: check the RST bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 331 | if (PREDICT_FALSE (tcp_rst (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 332 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 333 | tcp_rcv_rst (wrk, tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 334 | *error0 = TCP_ERROR_RST_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 335 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | /* 3rd: check security and precedence (skip) */ |
| 339 | |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 340 | /* 4th: check the SYN bit (in window) */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 341 | if (PREDICT_FALSE (tcp_syn (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 342 | { |
Florin Coras | d567a8d | 2019-06-07 12:38:55 -0700 | [diff] [blame] | 343 | /* As per RFC5961 send challenge ack instead of reset */ |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 344 | tcp_program_ack (tc0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 345 | *error0 = TCP_ERROR_SPURIOUS_SYN; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 346 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 347 | } |
| 348 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 349 | /* If segment in window, save timestamp */ |
| 350 | tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 351 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 352 | return 0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 353 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 354 | error: |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 355 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | always_inline int |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 359 | tcp_rcv_ack_no_cc (tcp_connection_t * tc, vlib_buffer_t * b, u32 * error) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 360 | { |
| 361 | /* SND.UNA =< SEG.ACK =< SND.NXT */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 362 | if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number) |
| 363 | && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt))) |
| 364 | { |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 365 | *error = TCP_ERROR_ACK_INVALID; |
| 366 | return -1; |
| 367 | } |
| 368 | |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 369 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
| 370 | tc->snd_una = vnet_buffer (b)->tcp.ack_number; |
| 371 | *error = TCP_ERROR_ACK_OK; |
| 372 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /** |
| 376 | * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298 |
| 377 | * |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 378 | * Note that although in the original article srtt and rttvar are scaled |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 379 | * to minimize round-off errors, here we don't. Instead, we rely on |
| 380 | * better precision time measurements. |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 381 | * |
| 382 | * A known limitation of the algorithm is that a drop in rtt results in a |
| 383 | * rttvar increase and bigger RTO. |
| 384 | * |
| 385 | * mrtt must be provided in @ref TCP_TICK multiples, i.e., in us. Note that |
| 386 | * timestamps are measured as ms ticks so they must be converted before |
| 387 | * calling this function. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 388 | */ |
| 389 | static void |
| 390 | tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) |
| 391 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 392 | int err, diff; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 393 | |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 394 | err = mrtt - tc->srtt; |
| 395 | tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); |
| 396 | diff = (clib_abs (err) - (int) tc->rttvar) >> 2; |
| 397 | tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 398 | } |
| 399 | |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 400 | static inline void |
| 401 | tcp_estimate_rtt_us (tcp_connection_t * tc, f64 mrtt) |
| 402 | { |
| 403 | tc->mrtt_us = tc->mrtt_us + (mrtt - tc->mrtt_us) * 0.125; |
| 404 | } |
| 405 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 406 | /** |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 407 | * Update rtt estimate |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 408 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 409 | * We have potentially three sources of rtt measurements: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 410 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 411 | * TSOPT difference between current and echoed timestamp. It has ms |
| 412 | * precision and can be computed per ack |
| 413 | * ACK timing one sequence number is tracked per rtt with us (micro second) |
| 414 | * precision. |
| 415 | * rate sample if enabled, all outstanding bytes are tracked with us |
| 416 | * precision. Every ack and sack are a rtt sample |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 417 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 418 | * Middle boxes are known to fiddle with TCP options so we give higher |
| 419 | * priority to ACK timing. |
| 420 | * |
| 421 | * For now, rate sample rtts are only used under congestion. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 422 | */ |
| 423 | static int |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 424 | tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 425 | { |
| 426 | u32 mrtt = 0; |
| 427 | |
| 428 | /* Karn's rule, part 1. Don't use retransmitted segments to estimate |
| 429 | * RTT because they're ambiguous. */ |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 430 | if (tcp_in_cong_recovery (tc)) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 431 | { |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 432 | /* Accept rtt estimates for samples that have not been retransmitted */ |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 433 | if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 434 | || (rs->flags & TCP_BTS_IS_RXT)) |
| 435 | goto done; |
| 436 | if (rs->rtt_time) |
| 437 | tcp_estimate_rtt_us (tc, rs->rtt_time); |
| 438 | mrtt = rs->rtt_time * THZ; |
| 439 | goto estimate_rtt; |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 440 | } |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 441 | |
| 442 | if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 443 | { |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 444 | f64 sample = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts; |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 445 | tcp_estimate_rtt_us (tc, sample); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 446 | mrtt = clib_max ((u32) (sample * THZ), 1); |
| 447 | /* Allow measuring of a new RTT */ |
| 448 | tc->rtt_ts = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 449 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 450 | /* As per RFC7323 TSecr can be used for RTTM only if the segment advances |
| 451 | * snd_una, i.e., the left side of the send window: |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 452 | * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ |
| 453 | else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 454 | { |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 455 | mrtt = clib_max (tcp_tstamp (tc) - tc->rcv_opts.tsecr, 1); |
| 456 | mrtt *= TCP_TSTP_TO_HZ; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 457 | } |
| 458 | |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 459 | estimate_rtt: |
| 460 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 461 | /* Ignore dubious measurements */ |
| 462 | if (mrtt == 0 || mrtt > TCP_RTT_MAX) |
| 463 | goto done; |
| 464 | |
| 465 | tcp_estimate_rtt (tc, mrtt); |
| 466 | |
| 467 | done: |
| 468 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 469 | /* If we got here something must've been ACKed so make sure boff is 0, |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 470 | * even if mrtt is not valid since we update the rto lower */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 471 | tc->rto_boff = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 472 | tcp_update_rto (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 473 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 474 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 475 | } |
| 476 | |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 477 | static void |
| 478 | tcp_estimate_initial_rtt (tcp_connection_t * tc) |
| 479 | { |
| 480 | u8 thread_index = vlib_num_workers ()? 1 : 0; |
| 481 | int mrtt; |
| 482 | |
| 483 | if (tc->rtt_ts) |
| 484 | { |
| 485 | tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 486 | tc->mrtt_us = clib_max (tc->mrtt_us, 0.0001); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 487 | mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1); |
| 488 | tc->rtt_ts = 0; |
| 489 | } |
| 490 | else |
| 491 | { |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 492 | mrtt = tcp_tstamp (tc) - tc->rcv_opts.tsecr; |
| 493 | mrtt = clib_max (mrtt, 1) * TCP_TSTP_TO_HZ; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 494 | /* Due to retransmits we don't know the initial mrtt */ |
| 495 | if (tc->rto_boff && mrtt > 1 * THZ) |
| 496 | mrtt = 1 * THZ; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 497 | tc->mrtt_us = (f64) mrtt *TCP_TICK; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | if (mrtt > 0 && mrtt < TCP_RTT_MAX) |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 501 | { |
| 502 | /* First measurement as per RFC 6298 */ |
| 503 | tc->srtt = mrtt; |
| 504 | tc->rttvar = mrtt >> 1; |
| 505 | } |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 506 | tcp_update_rto (tc); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 507 | } |
| 508 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 509 | /** |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 510 | * Dequeue bytes for connections that have received acks in last burst |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 511 | */ |
| 512 | static void |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 513 | tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 514 | { |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 515 | u32 thread_index = wrk->vm->thread_index; |
| 516 | u32 *pending_deq_acked; |
| 517 | tcp_connection_t *tc; |
| 518 | int i; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 519 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 520 | if (!vec_len (wrk->pending_deq_acked)) |
| 521 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 522 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 523 | pending_deq_acked = wrk->pending_deq_acked; |
| 524 | for (i = 0; i < vec_len (pending_deq_acked); i++) |
| 525 | { |
| 526 | tc = tcp_connection_get (pending_deq_acked[i], thread_index); |
| 527 | tc->flags &= ~TCP_CONN_DEQ_PENDING; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 528 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 529 | if (PREDICT_FALSE (!tc->burst_acked)) |
| 530 | continue; |
| 531 | |
| 532 | /* Dequeue the newly ACKed bytes */ |
| 533 | session_tx_fifo_dequeue_drop (&tc->connection, tc->burst_acked); |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 534 | tcp_validate_txf_size (tc, tc->snd_nxt - tc->snd_una); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 535 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 536 | if (tcp_is_descheduled (tc)) |
| 537 | tcp_reschedule (tc); |
| 538 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 539 | /* If everything has been acked, stop retransmit timer |
| 540 | * otherwise update. */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 541 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 542 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 543 | /* Update pacer based on our new cwnd estimate */ |
| 544 | tcp_connection_tx_pacer_update (tc); |
| 545 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 546 | tc->burst_acked = 0; |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 547 | } |
Damjan Marion | 8bea589 | 2022-04-04 22:40:45 +0200 | [diff] [blame] | 548 | vec_set_len (wrk->pending_deq_acked, 0); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | static void |
| 552 | tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 553 | { |
| 554 | if (!(tc->flags & TCP_CONN_DEQ_PENDING)) |
| 555 | { |
| 556 | vec_add1 (wrk->pending_deq_acked, tc->c_c_index); |
| 557 | tc->flags |= TCP_CONN_DEQ_PENDING; |
| 558 | } |
Florin Coras | 558e3e0 | 2019-09-06 12:56:58 -0700 | [diff] [blame] | 559 | tc->burst_acked += tc->bytes_acked; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 560 | } |
| 561 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 562 | /** |
| 563 | * Try to update snd_wnd based on feedback received from peer. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 564 | * |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 565 | * If successful, and new window is 'effectively' 0, activate persist |
| 566 | * timer. |
| 567 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 568 | static void |
| 569 | tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) |
| 570 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 571 | /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set |
| 572 | * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 573 | if (seq_lt (tc->snd_wl1, seq) |
| 574 | || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 575 | { |
| 576 | tc->snd_wnd = snd_wnd; |
| 577 | tc->snd_wl1 = seq; |
| 578 | tc->snd_wl2 = ack; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 579 | TCP_EVT (TCP_EVT_SND_WND, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 580 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 581 | if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 582 | { |
Florin Coras | c6a2f1f | 2022-03-14 14:23:39 -0700 | [diff] [blame] | 583 | if (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 584 | { |
| 585 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | c6a2f1f | 2022-03-14 14:23:39 -0700 | [diff] [blame] | 586 | |
| 587 | /* Set persist timer if we just got 0 wnd. If already set, |
| 588 | * update it because some data sent with snd_wnd < snd_mss was |
| 589 | * acked. */ |
| 590 | if (tcp_timer_is_active (tc, TCP_TIMER_PERSIST)) |
| 591 | tcp_persist_timer_reset (&wrk->timer_wheel, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 592 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
| 593 | } |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 594 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 595 | else |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 596 | { |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 597 | if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST))) |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 598 | { |
| 599 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 600 | tcp_persist_timer_reset (&wrk->timer_wheel, tc); |
| 601 | } |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 602 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 603 | if (PREDICT_FALSE (tcp_is_descheduled (tc))) |
| 604 | tcp_reschedule (tc); |
| 605 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 606 | if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 607 | { |
| 608 | tc->rto_boff = 0; |
| 609 | tcp_update_rto (tc); |
| 610 | } |
| 611 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 612 | } |
| 613 | } |
| 614 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 615 | /** |
| 616 | * Init loss recovery/fast recovery. |
| 617 | * |
| 618 | * Triggered by dup acks as opposed to timer timeout. Note that cwnd is |
| 619 | * updated in @ref tcp_cc_handle_event after fast retransmit |
| 620 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 621 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 622 | tcp_cc_init_congestion (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 623 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 624 | tcp_fastrecovery_on (tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 625 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | 6216600 | 2018-04-18 16:40:55 -0700 | [diff] [blame] | 626 | tc->cwnd_acc_bytes = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 627 | tc->snd_rxt_bytes = 0; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 628 | tc->rxt_delivered = 0; |
| 629 | tc->prr_delivered = 0; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 630 | tc->prr_start = tc->snd_una; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 631 | tc->prev_ssthresh = tc->ssthresh; |
| 632 | tc->prev_cwnd = tc->cwnd; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 633 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 634 | tc->snd_rxt_ts = tcp_tstamp (tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 635 | tcp_cc_congestion (tc); |
| 636 | |
| 637 | /* Post retransmit update cwnd to ssthresh and account for the |
| 638 | * three segments that have left the network and should've been |
| 639 | * buffered at the receiver XXX */ |
| 640 | if (!tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | cc4d6d0 | 2020-07-29 23:03:39 -0700 | [diff] [blame] | 641 | tc->cwnd += TCP_DUPACK_THRESHOLD * tc->snd_mss; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 642 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 643 | tc->fr_occurences += 1; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 644 | TCP_EVT (TCP_EVT_CC_EVT, tc, 4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 645 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 646 | |
| 647 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 648 | tcp_cc_congestion_undo (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 649 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 650 | tc->cwnd = tc->prev_cwnd; |
| 651 | tc->ssthresh = tc->prev_ssthresh; |
Florin Coras | eff6b82 | 2019-07-03 19:51:02 -0700 | [diff] [blame] | 652 | tcp_cc_undo_recovery (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 653 | ASSERT (tc->rto_boff == 0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 654 | TCP_EVT (TCP_EVT_CC_EVT, tc, 5); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 655 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 656 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 657 | static inline u8 |
| 658 | tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 659 | { |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 660 | return (tcp_in_recovery (tc) && tc->rto_boff == 1 |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 661 | && tc->snd_rxt_ts |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 662 | && tcp_opts_tstamp (&tc->rcv_opts) |
| 663 | && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); |
| 664 | } |
| 665 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 666 | static inline u8 |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 667 | tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) |
| 668 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 669 | return (tcp_cc_is_spurious_timeout_rxt (tc)); |
| 670 | } |
| 671 | |
| 672 | static inline u8 |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 673 | tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 674 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 675 | if (!has_sack) |
| 676 | { |
| 677 | /* If of of the two conditions lower hold, reset dupacks because |
| 678 | * we're probably after timeout (RFC6582 heuristics). |
| 679 | * If Cumulative ack does not cover more than congestion threshold, |
| 680 | * and: |
| 681 | * 1) The following doesn't hold: The congestion window is greater |
| 682 | * than SMSS bytes and the difference between highest_ack |
| 683 | * and prev_highest_ack is at most 4*SMSS bytes |
| 684 | * 2) Echoed timestamp in the last non-dup ack does not equal the |
| 685 | * stored timestamp |
| 686 | */ |
| 687 | if (seq_leq (tc->snd_una, tc->snd_congestion) |
| 688 | && ((!(tc->cwnd > tc->snd_mss |
| 689 | && tc->bytes_acked <= 4 * tc->snd_mss)) |
| 690 | || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) |
| 691 | { |
| 692 | tc->rcv_dupacks = 0; |
| 693 | return 0; |
| 694 | } |
| 695 | } |
Florin Coras | cc4d6d0 | 2020-07-29 23:03:39 -0700 | [diff] [blame] | 696 | return tc->sack_sb.lost_bytes || tc->rcv_dupacks >= tc->sack_sb.reorder; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 697 | } |
| 698 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 699 | static int |
Florin Coras | b56f24b | 2022-01-05 12:55:35 -0800 | [diff] [blame] | 700 | tcp_cc_try_recover (tcp_connection_t *tc) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 701 | { |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 702 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 703 | u8 is_spurious = 0; |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 704 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 705 | ASSERT (tcp_in_cong_recovery (tc)); |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 706 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 707 | if (tcp_cc_is_spurious_retransmit (tc)) |
| 708 | { |
| 709 | tcp_cc_congestion_undo (tc); |
| 710 | is_spurious = 1; |
| 711 | } |
| 712 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 713 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 714 | tc->rcv_dupacks = 0; |
Florin Coras | 8e76dfa | 2022-01-05 19:54:45 -0800 | [diff] [blame] | 715 | tcp_recovery_off (tc); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 716 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 717 | /* Previous recovery left us congested. Continue sending as part |
| 718 | * of the current recovery event with an updated snd_congestion */ |
Florin Coras | 8e76dfa | 2022-01-05 19:54:45 -0800 | [diff] [blame] | 719 | if (tc->sack_sb.sacked_bytes && tcp_in_fastrecovery (tc)) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 720 | { |
| 721 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | b56f24b | 2022-01-05 12:55:35 -0800 | [diff] [blame] | 722 | return -1; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 723 | } |
| 724 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 725 | tc->rxt_delivered = 0; |
| 726 | tc->snd_rxt_bytes = 0; |
| 727 | tc->snd_rxt_ts = 0; |
| 728 | tc->prr_delivered = 0; |
| 729 | tc->rtt_ts = 0; |
| 730 | tc->flags &= ~TCP_CONN_RXT_PENDING; |
| 731 | |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 732 | hole = scoreboard_first_hole (&tc->sack_sb); |
| 733 | if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt) |
| 734 | scoreboard_clear (&tc->sack_sb); |
| 735 | |
Florin Coras | 8e76dfa | 2022-01-05 19:54:45 -0800 | [diff] [blame] | 736 | if (tcp_in_fastrecovery (tc) && !is_spurious) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 737 | tcp_cc_recovered (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 738 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 739 | tcp_fastrecovery_off (tc); |
| 740 | tcp_fastrecovery_first_off (tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 741 | TCP_EVT (TCP_EVT_CC_EVT, tc, 3); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 742 | |
| 743 | ASSERT (tc->rto_boff == 0); |
| 744 | ASSERT (!tcp_in_cong_recovery (tc)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 745 | ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 746 | |
Florin Coras | b56f24b | 2022-01-05 12:55:35 -0800 | [diff] [blame] | 747 | return 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 748 | } |
| 749 | |
| 750 | static void |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 751 | tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 752 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 753 | ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 754 | |
| 755 | /* Congestion avoidance */ |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 756 | tcp_cc_rcv_ack (tc, rs); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 757 | |
| 758 | /* If a cumulative ack, make sure dupacks is 0 */ |
| 759 | tc->rcv_dupacks = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 762 | /** |
| 763 | * One function to rule them all ... and in the darkness bind them |
| 764 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 765 | static void |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 766 | tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs, |
| 767 | u32 is_dack) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 768 | { |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 769 | u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 770 | |
Florin Coras | 1de7167 | 2019-12-22 09:20:26 -0800 | [diff] [blame] | 771 | /* If reneging, wait for timer based retransmits */ |
| 772 | if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging)) |
| 773 | return; |
| 774 | |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 775 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 776 | * If not in recovery, figure out if we should enter |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 777 | */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 778 | if (!tcp_in_cong_recovery (tc)) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 779 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 780 | ASSERT (is_dack); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 781 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 782 | tc->rcv_dupacks++; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 783 | TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); |
| 784 | tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 785 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 786 | if (tcp_should_fastrecover (tc, has_sack)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 787 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 788 | tcp_cc_init_congestion (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 789 | |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 790 | if (has_sack) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 791 | scoreboard_init_rxt (&tc->sack_sb, tc->snd_una); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 792 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 793 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); |
| 794 | tcp_program_retransmit (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 795 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 796 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 797 | return; |
| 798 | } |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 799 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 800 | /* |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 801 | * Already in recovery |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 802 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 803 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 804 | /* |
Florin Coras | b56f24b | 2022-01-05 12:55:35 -0800 | [diff] [blame] | 805 | * See if we can exit and stop retransmitting |
| 806 | */ |
| 807 | if (seq_geq (tc->snd_una, tc->snd_congestion)) |
| 808 | { |
| 809 | /* If successfully recovered, treat ack as congestion avoidance ack |
| 810 | * and return. Otherwise, we're still congested so process feedback */ |
| 811 | if (!tcp_cc_try_recover (tc)) |
| 812 | { |
| 813 | tcp_cc_rcv_ack (tc, rs); |
| 814 | return; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 819 | * Process (re)transmit feedback. Output path uses this to decide how much |
| 820 | * more data to release into the network |
| 821 | */ |
| 822 | if (has_sack) |
| 823 | { |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 824 | if (!tc->bytes_acked && tc->sack_sb.rxt_sacked) |
| 825 | tcp_fastrecovery_first_on (tc); |
| 826 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 827 | tc->rxt_delivered += tc->sack_sb.rxt_sacked; |
Florin Coras | 0f8b91f | 2022-01-05 08:47:11 -0800 | [diff] [blame] | 828 | tc->prr_delivered += rs->delivered; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 829 | } |
| 830 | else |
| 831 | { |
| 832 | if (is_dack) |
| 833 | { |
| 834 | tc->rcv_dupacks += 1; |
| 835 | TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); |
| 836 | } |
Florin Coras | 56cef05 | 2020-01-15 20:18:35 +0000 | [diff] [blame] | 837 | tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked, |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 838 | tc->snd_rxt_bytes); |
| 839 | if (is_dack) |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 840 | tc->prr_delivered += clib_min (tc->snd_mss, |
| 841 | tc->snd_nxt - tc->snd_una); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 842 | else |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 843 | tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked, |
| 844 | tc->snd_mss * |
| 845 | tc->rcv_dupacks); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 846 | |
| 847 | /* If partial ack, assume that the first un-acked segment was lost */ |
| 848 | if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) |
| 849 | tcp_fastrecovery_first_on (tc); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 850 | } |
| 851 | |
Florin Coras | 34177e8 | 2020-03-20 20:25:37 +0000 | [diff] [blame] | 852 | tcp_program_retransmit (tc); |
| 853 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 854 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 855 | * Notify cc of the event |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 856 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 857 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 858 | if (!tc->bytes_acked) |
| 859 | { |
| 860 | tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); |
| 861 | return; |
| 862 | } |
| 863 | |
| 864 | /* RFC6675: If the incoming ACK is a cumulative acknowledgment, |
| 865 | * reset dupacks to 0. Also needed if in congestion recovery */ |
| 866 | tc->rcv_dupacks = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 867 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 868 | if (tcp_in_recovery (tc)) |
| 869 | tcp_cc_rcv_ack (tc, rs); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 870 | else |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 871 | tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 872 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 873 | |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 874 | static void |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 875 | tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs) |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 876 | { |
| 877 | if (!tcp_in_cong_recovery (tc)) |
| 878 | return; |
| 879 | |
| 880 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 881 | tcp_rcv_sacks (tc, tc->snd_una); |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 882 | |
| 883 | tc->bytes_acked = 0; |
| 884 | |
| 885 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 886 | tcp_bt_sample_delivery_rate (tc, rs); |
| 887 | |
| 888 | tcp_cc_handle_event (tc, rs, 1); |
| 889 | } |
| 890 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 891 | /** |
| 892 | * Check if duplicate ack as per RFC5681 Sec. 2 |
| 893 | */ |
| 894 | always_inline u8 |
| 895 | tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, |
| 896 | u32 prev_snd_una) |
| 897 | { |
| 898 | return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) |
| 899 | && seq_gt (tc->snd_nxt, tc->snd_una) |
| 900 | && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) |
| 901 | && (prev_snd_wnd == tc->snd_wnd)); |
| 902 | } |
| 903 | |
| 904 | /** |
| 905 | * Checks if ack is a congestion control event. |
| 906 | */ |
| 907 | static u8 |
| 908 | tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, |
| 909 | u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) |
| 910 | { |
| 911 | /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are |
| 912 | * defined to be 'duplicate' as well */ |
| 913 | *is_dack = tc->sack_sb.last_sacked_bytes |
| 914 | || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); |
| 915 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 916 | return (*is_dack || tcp_in_cong_recovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 917 | } |
| 918 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 919 | /** |
| 920 | * Process incoming ACK |
| 921 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 922 | static int |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 923 | tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 924 | tcp_header_t * th, u32 * error) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 925 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 926 | u32 prev_snd_wnd, prev_snd_una; |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 927 | tcp_rate_sample_t rs = { 0 }; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 928 | u8 is_dack; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 929 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 930 | TCP_EVT (TCP_EVT_CC_STAT, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 931 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 932 | /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 933 | if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 934 | { |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 935 | tc->errors.above_ack_wnd += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 936 | *error = TCP_ERROR_ACK_FUTURE; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 937 | TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 938 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 939 | } |
| 940 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 941 | /* If old ACK, probably it's an old dupack */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 942 | if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 943 | { |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 944 | tc->errors.below_ack_wnd += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 945 | *error = TCP_ERROR_ACK_OLD; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 946 | TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 947 | |
| 948 | if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd)) |
| 949 | return -1; |
| 950 | |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 951 | tcp_handle_old_ack (tc, &rs); |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 952 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 953 | /* Don't drop yet */ |
| 954 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 955 | } |
| 956 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 957 | /* |
| 958 | * Looks okay, process feedback |
| 959 | */ |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 960 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 961 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 962 | tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); |
| 963 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 964 | prev_snd_wnd = tc->snd_wnd; |
| 965 | prev_snd_una = tc->snd_una; |
| 966 | tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, |
| 967 | vnet_buffer (b)->tcp.ack_number, |
| 968 | clib_net_to_host_u16 (th->window) << tc->snd_wscale); |
| 969 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
Florin Coras | 558e3e0 | 2019-09-06 12:56:58 -0700 | [diff] [blame] | 970 | tc->snd_una = vnet_buffer (b)->tcp.ack_number; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 971 | tcp_validate_txf_size (tc, tc->bytes_acked); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 972 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 973 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 974 | tcp_bt_sample_delivery_rate (tc, &rs); |
Florin Coras | 0f8b91f | 2022-01-05 08:47:11 -0800 | [diff] [blame] | 975 | else |
| 976 | rs.delivered = tc->bytes_acked + tc->sack_sb.last_sacked_bytes - |
| 977 | tc->sack_sb.last_bytes_delivered; |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 978 | |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 979 | if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes) |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 980 | { |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 981 | tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 982 | if (tc->bytes_acked) |
| 983 | tcp_program_dequeue (wrk, tc); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 984 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 985 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 986 | TCP_EVT (TCP_EVT_ACK_RCVD, tc); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 987 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 988 | /* |
| 989 | * Check if we have congestion event |
| 990 | */ |
| 991 | |
| 992 | if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 993 | { |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 994 | tcp_cc_handle_event (tc, &rs, is_dack); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 995 | tc->dupacks_in += is_dack; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 996 | if (!tcp_in_cong_recovery (tc)) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 997 | { |
| 998 | *error = TCP_ERROR_ACK_OK; |
| 999 | return 0; |
| 1000 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1001 | *error = TCP_ERROR_ACK_DUP; |
Florin Coras | ca09d07 | 2018-10-01 18:31:02 -0700 | [diff] [blame] | 1002 | if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th)) |
| 1003 | return 0; |
| 1004 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1005 | } |
| 1006 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1007 | /* |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1008 | * Update congestion control (slow start/congestion avoidance) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1009 | */ |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1010 | tcp_cc_update (tc, &rs); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1011 | *error = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1012 | return 0; |
| 1013 | } |
| 1014 | |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1015 | static void |
| 1016 | tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 1017 | { |
| 1018 | if (!tcp_disconnect_pending (tc)) |
| 1019 | { |
| 1020 | vec_add1 (wrk->pending_disconnects, tc->c_c_index); |
| 1021 | tcp_disconnect_pending_on (tc); |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | static void |
| 1026 | tcp_handle_disconnects (tcp_worker_ctx_t * wrk) |
| 1027 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1028 | u32 thread_index, *pending_disconnects, *pending_resets; |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1029 | tcp_connection_t *tc; |
| 1030 | int i; |
| 1031 | |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1032 | if (vec_len (wrk->pending_disconnects)) |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1033 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1034 | thread_index = wrk->vm->thread_index; |
| 1035 | pending_disconnects = wrk->pending_disconnects; |
| 1036 | for (i = 0; i < vec_len (pending_disconnects); i++) |
| 1037 | { |
| 1038 | tc = tcp_connection_get (pending_disconnects[i], thread_index); |
| 1039 | tcp_disconnect_pending_off (tc); |
| 1040 | session_transport_closing_notify (&tc->connection); |
| 1041 | } |
Damjan Marion | 8bea589 | 2022-04-04 22:40:45 +0200 | [diff] [blame] | 1042 | vec_set_len (wrk->pending_disconnects, 0); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1043 | } |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1044 | |
| 1045 | if (vec_len (wrk->pending_resets)) |
| 1046 | { |
| 1047 | thread_index = wrk->vm->thread_index; |
| 1048 | pending_resets = wrk->pending_resets; |
| 1049 | for (i = 0; i < vec_len (pending_resets); i++) |
| 1050 | { |
| 1051 | tc = tcp_connection_get (pending_resets[i], thread_index); |
| 1052 | tcp_disconnect_pending_off (tc); |
| 1053 | tcp_handle_rst (tc); |
| 1054 | } |
Damjan Marion | 8bea589 | 2022-04-04 22:40:45 +0200 | [diff] [blame] | 1055 | vec_set_len (wrk->pending_resets, 0); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1056 | } |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | static void |
| 1060 | tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, |
| 1061 | u32 * error) |
| 1062 | { |
Florin Coras | f73d4c2 | 2019-06-28 09:18:48 -0700 | [diff] [blame] | 1063 | /* Reject out-of-order fins */ |
| 1064 | if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt) |
| 1065 | return; |
| 1066 | |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1067 | /* Account for the FIN and send ack */ |
| 1068 | tc->rcv_nxt += 1; |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1069 | tc->flags |= TCP_CONN_FINRCVD; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1070 | tcp_program_ack (tc); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1071 | /* Enter CLOSE-WAIT and notify session. To avoid lingering |
| 1072 | * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1073 | tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1074 | tcp_program_disconnect (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1075 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| 1076 | tcp_cfg.closewait_time); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1077 | TCP_EVT (TCP_EVT_FIN_RCVD, tc); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1078 | *error = TCP_ERROR_FIN_RCVD; |
| 1079 | } |
| 1080 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1081 | /** Enqueue data for delivery to application */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1082 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1083 | tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1084 | u16 data_len) |
| 1085 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1086 | int written, error = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1087 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1088 | ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1089 | ASSERT (data_len); |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1090 | written = session_enqueue_stream_connection (&tc->connection, b, 0, |
| 1091 | 1 /* queue event */ , 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1092 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1093 | TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1094 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1095 | /* Update rcv_nxt */ |
| 1096 | if (PREDICT_TRUE (written == data_len)) |
| 1097 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1098 | tc->rcv_nxt += written; |
Florin Coras | c37ce79 | 2022-08-29 11:35:53 -0700 | [diff] [blame] | 1099 | tc->bytes_in += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1100 | } |
| 1101 | /* If more data written than expected, account for out-of-order bytes. */ |
| 1102 | else if (written > data_len) |
| 1103 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1104 | tc->rcv_nxt += written; |
Florin Coras | c37ce79 | 2022-08-29 11:35:53 -0700 | [diff] [blame] | 1105 | tc->bytes_in += data_len; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1106 | TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1107 | } |
| 1108 | else if (written > 0) |
| 1109 | { |
| 1110 | /* We've written something but FIFO is probably full now */ |
| 1111 | tc->rcv_nxt += written; |
Florin Coras | c37ce79 | 2022-08-29 11:35:53 -0700 | [diff] [blame] | 1112 | tc->bytes_in += written; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1113 | error = TCP_ERROR_PARTIALLY_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1114 | } |
| 1115 | else |
| 1116 | { |
Florin Coras | dfd980f | 2020-03-26 02:45:39 +0000 | [diff] [blame] | 1117 | /* Packet made it through for ack processing */ |
| 1118 | if (tc->rcv_wnd < tc->snd_mss) |
| 1119 | return TCP_ERROR_ZERO_RWND; |
| 1120 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1121 | return TCP_ERROR_FIFO_FULL; |
| 1122 | } |
| 1123 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1124 | /* Update SACK list if need be */ |
Florin Coras | 607ece3 | 2021-04-22 21:10:02 -0700 | [diff] [blame] | 1125 | if (tcp_opts_sack_permitted (&tc->rcv_opts) && vec_len (tc->snd_sacks)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1126 | { |
| 1127 | /* Remove SACK blocks that have been delivered */ |
| 1128 | tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); |
| 1129 | } |
| 1130 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1131 | return error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1132 | } |
| 1133 | |
| 1134 | /** Enqueue out-of-order data */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1135 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1136 | tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1137 | u16 data_len) |
| 1138 | { |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1139 | session_t *s0; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1140 | int rv, offset; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1141 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1142 | ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1143 | ASSERT (data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1144 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1145 | /* Enqueue out-of-order data with relative offset */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1146 | rv = session_enqueue_stream_connection (&tc->connection, b, |
| 1147 | vnet_buffer (b)->tcp.seq_number - |
| 1148 | tc->rcv_nxt, 0 /* queue event */ , |
| 1149 | 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1150 | |
| 1151 | /* Nothing written */ |
| 1152 | if (rv) |
| 1153 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1154 | TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1155 | return TCP_ERROR_FIFO_FULL; |
| 1156 | } |
| 1157 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1158 | TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1159 | tc->bytes_in += data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1160 | |
| 1161 | /* Update SACK list if in use */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1162 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1163 | { |
| 1164 | ooo_segment_t *newest; |
| 1165 | u32 start, end; |
| 1166 | |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1167 | s0 = session_get (tc->c_s_index, tc->c_thread_index); |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1168 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1169 | /* Get the newest segment from the fifo */ |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1170 | newest = svm_fifo_newest_ooo_segment (s0->rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1171 | if (newest) |
| 1172 | { |
Sirshak Das | 28aa539 | 2019-02-05 01:33:33 -0600 | [diff] [blame] | 1173 | offset = ooo_segment_offset_prod (s0->rx_fifo, newest); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1174 | ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); |
| 1175 | start = tc->rcv_nxt + offset; |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1176 | end = start + ooo_segment_length (s0->rx_fifo, newest); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1177 | tcp_update_sack_list (tc, start, end); |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1178 | svm_fifo_newest_ooo_segment_reset (s0->rx_fifo); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1179 | TCP_EVT (TCP_EVT_CC_SACKS, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1180 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1181 | } |
| 1182 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1183 | return TCP_ERROR_ENQUEUED_OOO; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1184 | } |
| 1185 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1186 | static int |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1187 | tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) |
| 1188 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1189 | u32 discard, first = b->current_length; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1190 | vlib_main_t *vm = vlib_get_main (); |
| 1191 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1192 | /* Handle multi-buffer segments */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1193 | if (n_bytes_to_drop > b->current_length) |
| 1194 | { |
| 1195 | if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1196 | return -1; |
| 1197 | do |
| 1198 | { |
| 1199 | discard = clib_min (n_bytes_to_drop, b->current_length); |
| 1200 | vlib_buffer_advance (b, discard); |
| 1201 | b = vlib_get_buffer (vm, b->next_buffer); |
| 1202 | n_bytes_to_drop -= discard; |
| 1203 | } |
| 1204 | while (n_bytes_to_drop); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1205 | if (n_bytes_to_drop > first) |
| 1206 | b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1207 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1208 | else |
| 1209 | vlib_buffer_advance (b, n_bytes_to_drop); |
| 1210 | vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1211 | return 0; |
| 1212 | } |
| 1213 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1214 | /** |
| 1215 | * Receive buffer for connection and handle acks |
| 1216 | * |
| 1217 | * It handles both in order or out-of-order data. |
| 1218 | */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1219 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1220 | tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1221 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1222 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1223 | u32 error, n_bytes_to_drop, n_data_bytes; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1224 | |
| 1225 | vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); |
| 1226 | n_data_bytes = vnet_buffer (b)->tcp.data_len; |
| 1227 | ASSERT (n_data_bytes); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1228 | tc->data_segs_in += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1229 | |
Florin Coras | 1f85dad | 2020-11-05 13:39:48 -0800 | [diff] [blame] | 1230 | /* Make sure we don't consume trailing bytes */ |
Florin Coras | ab0a87f | 2020-11-09 19:03:09 -0800 | [diff] [blame] | 1231 | if (PREDICT_FALSE (b->current_length > n_data_bytes)) |
Florin Coras | 1f85dad | 2020-11-05 13:39:48 -0800 | [diff] [blame] | 1232 | b->current_length = n_data_bytes; |
| 1233 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1234 | /* Handle out-of-order data */ |
| 1235 | if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) |
| 1236 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1237 | /* Old sequence numbers allowed through because they overlapped |
| 1238 | * the rx window */ |
| 1239 | if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1240 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1241 | /* Completely in the past (possible retransmit). Ack |
| 1242 | * retransmissions since we may not have any data to send */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1243 | if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1244 | { |
Florin Coras | 7fd59cc | 2020-03-12 15:50:57 +0000 | [diff] [blame] | 1245 | tcp_program_dupack (tc); |
| 1246 | tc->errors.below_data_wnd++; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1247 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1248 | goto done; |
| 1249 | } |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1250 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1251 | /* Chop off the bytes in the past and see if what is left |
| 1252 | * can be enqueued in order */ |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1253 | n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; |
| 1254 | n_data_bytes -= n_bytes_to_drop; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1255 | vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1256 | if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1257 | { |
| 1258 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1259 | goto done; |
| 1260 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1261 | goto in_order; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1262 | } |
| 1263 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1264 | /* RFC2581: Enqueue and send DUPACK for fast retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1265 | error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1266 | tcp_program_dupack (tc); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1267 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1268 | tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end, |
| 1269 | tc->rcv_las + tc->rcv_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1270 | goto done; |
| 1271 | } |
| 1272 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1273 | in_order: |
| 1274 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1275 | /* In order data, enqueue. Fifo figures out by itself if any out-of-order |
| 1276 | * segments can be enqueued after fifo tail offset changes. */ |
| 1277 | error = tcp_session_enqueue_data (tc, b, n_data_bytes); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1278 | tcp_program_ack (tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1279 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1280 | done: |
| 1281 | return error; |
| 1282 | } |
| 1283 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1284 | typedef struct |
| 1285 | { |
| 1286 | tcp_header_t tcp_header; |
| 1287 | tcp_connection_t tcp_connection; |
| 1288 | } tcp_rx_trace_t; |
| 1289 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1290 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1291 | format_tcp_rx_trace (u8 * s, va_list * args) |
| 1292 | { |
| 1293 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1294 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1295 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 1296 | tcp_connection_t *tc = &t->tcp_connection; |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 1297 | u32 indent = format_get_indent (s); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1298 | |
Filip Tehlar | bc4dc16 | 2023-04-17 12:22:12 +0200 | [diff] [blame] | 1299 | if (!tc->c_lcl_port) |
| 1300 | s = format (s, "no tcp connection\n%U%U", format_white_space, indent, |
| 1301 | format_tcp_header, &t->tcp_header, 128); |
| 1302 | else |
| 1303 | s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc, |
| 1304 | format_tcp_state, tc->state, format_white_space, indent, |
| 1305 | format_tcp_header, &t->tcp_header, 128); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1306 | |
| 1307 | return s; |
| 1308 | } |
| 1309 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1310 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1311 | format_tcp_rx_trace_short (u8 * s, va_list * args) |
| 1312 | { |
| 1313 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1314 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1315 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1316 | |
| 1317 | s = format (s, "%d -> %d (%U)", |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1318 | clib_net_to_host_u16 (t->tcp_header.dst_port), |
| 1319 | clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1320 | t->tcp_connection.state); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1321 | |
| 1322 | return s; |
| 1323 | } |
| 1324 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1325 | static void |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1326 | tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, |
| 1327 | tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) |
| 1328 | { |
| 1329 | if (tc0) |
| 1330 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1331 | clib_memcpy_fast (&t0->tcp_connection, tc0, |
| 1332 | sizeof (t0->tcp_connection)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1333 | } |
| 1334 | else |
| 1335 | { |
| 1336 | th0 = tcp_buffer_hdr (b0); |
| 1337 | } |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1338 | clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1339 | } |
| 1340 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1341 | static void |
| 1342 | tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1343 | vlib_frame_t * frame, u8 is_ip4) |
| 1344 | { |
| 1345 | u32 *from, n_left; |
| 1346 | |
| 1347 | n_left = frame->n_vectors; |
| 1348 | from = vlib_frame_vector_args (frame); |
| 1349 | |
| 1350 | while (n_left >= 1) |
| 1351 | { |
| 1352 | tcp_connection_t *tc0; |
| 1353 | tcp_rx_trace_t *t0; |
| 1354 | tcp_header_t *th0; |
| 1355 | vlib_buffer_t *b0; |
| 1356 | u32 bi0; |
| 1357 | |
| 1358 | bi0 = from[0]; |
| 1359 | b0 = vlib_get_buffer (vm, bi0); |
| 1360 | |
| 1361 | if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| 1362 | { |
| 1363 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 1364 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 1365 | vm->thread_index); |
| 1366 | th0 = tcp_buffer_hdr (b0); |
| 1367 | tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); |
| 1368 | } |
| 1369 | |
| 1370 | from += 1; |
| 1371 | n_left -= 1; |
| 1372 | } |
| 1373 | } |
| 1374 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1375 | always_inline uword |
| 1376 | tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1377 | vlib_frame_t * frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1378 | { |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 1379 | u32 thread_index = vm->thread_index, n_left_from, *from; |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1380 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1381 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1382 | u16 err_counters[TCP_N_ERROR] = { 0 }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1383 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1384 | if (node->flags & VLIB_NODE_FLAG_TRACE) |
| 1385 | tcp_established_trace_frame (vm, node, frame, is_ip4); |
| 1386 | |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1387 | from = vlib_frame_vector_args (frame); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1388 | n_left_from = frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1389 | |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1390 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 1391 | b = bufs; |
| 1392 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1393 | while (n_left_from > 0) |
| 1394 | { |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1395 | u32 error = TCP_ERROR_ACK_OK; |
| 1396 | tcp_connection_t *tc; |
| 1397 | tcp_header_t *th; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1398 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1399 | if (n_left_from > 1) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1400 | { |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1401 | vlib_prefetch_buffer_header (b[1], LOAD); |
| 1402 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1403 | } |
| 1404 | |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1405 | tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 1406 | thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1407 | |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1408 | if (PREDICT_FALSE (tc == 0)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1409 | { |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1410 | error = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1411 | goto done; |
| 1412 | } |
| 1413 | |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1414 | th = tcp_buffer_hdr (b[0]); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1415 | |
| 1416 | /* TODO header prediction fast path */ |
| 1417 | |
| 1418 | /* 1-4: check SEQ, RST, SYN */ |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1419 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], th, &error))) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1420 | { |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1421 | TCP_EVT (TCP_EVT_SEG_INVALID, tc, vnet_buffer (b[0])->tcp); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1422 | goto done; |
| 1423 | } |
| 1424 | |
| 1425 | /* 5: check the ACK field */ |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1426 | if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc, b[0], th, &error))) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1427 | goto done; |
| 1428 | |
| 1429 | /* 6: check the URG bit TODO */ |
| 1430 | |
| 1431 | /* 7: process the segment text */ |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1432 | if (vnet_buffer (b[0])->tcp.data_len) |
| 1433 | error = tcp_segment_rcv (wrk, tc, b[0]); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1434 | |
| 1435 | /* 8: check the FIN bit */ |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1436 | if (PREDICT_FALSE (tcp_is_fin (th))) |
| 1437 | tcp_rcv_fin (wrk, tc, b[0], &error); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1438 | |
| 1439 | done: |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1440 | tcp_inc_err_counter (err_counters, error, 1); |
| 1441 | |
| 1442 | n_left_from -= 1; |
| 1443 | b += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1444 | } |
| 1445 | |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 1446 | session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1447 | tcp_store_err_counters (established, err_counters); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1448 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1449 | tcp_handle_disconnects (wrk); |
Florin Coras | 974b468 | 2021-04-22 18:53:30 -0700 | [diff] [blame] | 1450 | vlib_buffer_free (vm, from, frame->n_vectors); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1451 | |
| 1452 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1453 | } |
| 1454 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1455 | VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm, |
| 1456 | vlib_node_runtime_t * node, |
| 1457 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1458 | { |
| 1459 | return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 1460 | } |
| 1461 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1462 | VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm, |
| 1463 | vlib_node_runtime_t * node, |
| 1464 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1465 | { |
| 1466 | return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 1467 | } |
| 1468 | |
| 1469 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 1470 | VLIB_REGISTER_NODE (tcp4_established_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1471 | .name = "tcp4-established", |
| 1472 | /* Takes a vector of packets. */ |
| 1473 | .vector_size = sizeof (u32), |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 1474 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 1475 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1476 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1477 | }; |
| 1478 | /* *INDENT-ON* */ |
| 1479 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1480 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 1481 | VLIB_REGISTER_NODE (tcp6_established_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1482 | .name = "tcp6-established", |
| 1483 | /* Takes a vector of packets. */ |
| 1484 | .vector_size = sizeof (u32), |
| 1485 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 1486 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1487 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1488 | }; |
| 1489 | /* *INDENT-ON* */ |
| 1490 | |
| 1491 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1492 | static u8 |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1493 | tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1494 | tcp_header_t * hdr) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1495 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1496 | transport_connection_t *tmp = 0; |
| 1497 | u64 handle; |
| 1498 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1499 | if (!tc) |
| 1500 | return 1; |
| 1501 | |
Florin Coras | 7013113 | 2017-11-27 02:43:30 -0800 | [diff] [blame] | 1502 | /* Proxy case */ |
| 1503 | if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) |
| 1504 | return 1; |
| 1505 | |
Florin Coras | 07df791 | 2019-11-07 08:26:06 -0800 | [diff] [blame] | 1506 | u8 is_ip_valid = 0, val_l, val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1507 | |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1508 | if (tc->connection.is_ip4) |
| 1509 | { |
| 1510 | ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b); |
Florin Coras | 07df791 | 2019-11-07 08:26:06 -0800 | [diff] [blame] | 1511 | |
| 1512 | val_l = !ip4_address_compare (&ip4_hdr->dst_address, |
| 1513 | &tc->connection.lcl_ip.ip4); |
| 1514 | val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1); |
| 1515 | val_r = !ip4_address_compare (&ip4_hdr->src_address, |
| 1516 | &tc->connection.rmt_ip.ip4); |
| 1517 | val_r = val_r || tc->state == TCP_STATE_LISTEN; |
| 1518 | is_ip_valid = val_l && val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1519 | } |
| 1520 | else |
| 1521 | { |
| 1522 | ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b); |
Florin Coras | 07df791 | 2019-11-07 08:26:06 -0800 | [diff] [blame] | 1523 | |
| 1524 | val_l = !ip6_address_compare (&ip6_hdr->dst_address, |
| 1525 | &tc->connection.lcl_ip.ip6); |
| 1526 | val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0); |
| 1527 | val_r = !ip6_address_compare (&ip6_hdr->src_address, |
| 1528 | &tc->connection.rmt_ip.ip6); |
| 1529 | val_r = val_r || tc->state == TCP_STATE_LISTEN; |
| 1530 | is_ip_valid = val_l && val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1531 | } |
| 1532 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1533 | u8 is_valid = (tc->c_lcl_port == hdr->dst_port |
| 1534 | && (tc->state == TCP_STATE_LISTEN |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1535 | || tc->c_rmt_port == hdr->src_port) && is_ip_valid); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1536 | |
| 1537 | if (!is_valid) |
| 1538 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1539 | handle = session_lookup_half_open_handle (&tc->connection); |
| 1540 | tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF, |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1541 | tc->c_proto, tc->c_is_ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1542 | |
| 1543 | if (tmp) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1544 | { |
| 1545 | if (tmp->lcl_port == hdr->dst_port |
| 1546 | && tmp->rmt_port == hdr->src_port) |
| 1547 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1548 | TCP_DBG ("half-open is valid!"); |
Ryujiro Shibuya | 3ea17d5 | 2019-11-05 07:24:32 +0000 | [diff] [blame] | 1549 | is_valid = 1; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1550 | } |
| 1551 | } |
| 1552 | } |
| 1553 | return is_valid; |
| 1554 | } |
| 1555 | |
| 1556 | /** |
| 1557 | * Lookup transport connection |
| 1558 | */ |
| 1559 | static tcp_connection_t * |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1560 | tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, |
| 1561 | u8 is_ip4) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1562 | { |
| 1563 | tcp_header_t *tcp; |
| 1564 | transport_connection_t *tconn; |
| 1565 | tcp_connection_t *tc; |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1566 | u8 is_filtered = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1567 | if (is_ip4) |
| 1568 | { |
| 1569 | ip4_header_t *ip4; |
| 1570 | ip4 = vlib_buffer_get_current (b); |
| 1571 | tcp = ip4_next_header (ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1572 | tconn = session_lookup_connection_wt4 (fib_index, |
| 1573 | &ip4->dst_address, |
| 1574 | &ip4->src_address, |
| 1575 | tcp->dst_port, |
| 1576 | tcp->src_port, |
| 1577 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1578 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1579 | tc = tcp_get_connection_from_transport (tconn); |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1580 | ASSERT (tcp_lookup_is_valid (tc, b, tcp)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1581 | } |
| 1582 | else |
| 1583 | { |
| 1584 | ip6_header_t *ip6; |
| 1585 | ip6 = vlib_buffer_get_current (b); |
| 1586 | tcp = ip6_next_header (ip6); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1587 | tconn = session_lookup_connection_wt6 (fib_index, |
| 1588 | &ip6->dst_address, |
| 1589 | &ip6->src_address, |
| 1590 | tcp->dst_port, |
| 1591 | tcp->src_port, |
| 1592 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1593 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1594 | tc = tcp_get_connection_from_transport (tconn); |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1595 | ASSERT (tcp_lookup_is_valid (tc, b, tcp)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1596 | } |
| 1597 | return tc; |
| 1598 | } |
| 1599 | |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 1600 | static tcp_connection_t * |
| 1601 | tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4) |
| 1602 | { |
| 1603 | session_t *s; |
| 1604 | |
| 1605 | if (is_ip4) |
| 1606 | { |
| 1607 | ip4_header_t *ip4 = vlib_buffer_get_current (b); |
| 1608 | tcp_header_t *tcp = tcp_buffer_hdr (b); |
| 1609 | s = session_lookup_listener4 (fib_index, |
| 1610 | &ip4->dst_address, |
| 1611 | tcp->dst_port, TRANSPORT_PROTO_TCP, 1); |
| 1612 | } |
| 1613 | else |
| 1614 | { |
| 1615 | ip6_header_t *ip6 = vlib_buffer_get_current (b); |
| 1616 | tcp_header_t *tcp = tcp_buffer_hdr (b); |
| 1617 | s = session_lookup_listener6 (fib_index, |
| 1618 | &ip6->dst_address, |
| 1619 | tcp->dst_port, TRANSPORT_PROTO_TCP, 1); |
| 1620 | |
| 1621 | } |
| 1622 | if (PREDICT_TRUE (s != 0)) |
| 1623 | return tcp_get_connection_from_transport (transport_get_listener |
| 1624 | (TRANSPORT_PROTO_TCP, |
| 1625 | s->connection_index)); |
| 1626 | else |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1630 | static void |
| 1631 | tcp46_syn_sent_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 1632 | u32 *from, u32 n_bufs) |
| 1633 | { |
| 1634 | tcp_connection_t *tc = 0; |
| 1635 | tcp_rx_trace_t *t; |
| 1636 | vlib_buffer_t *b; |
| 1637 | int i; |
| 1638 | |
| 1639 | for (i = 0; i < n_bufs; i++) |
| 1640 | { |
| 1641 | b = vlib_get_buffer (vm, from[i]); |
| 1642 | if (!(b->flags & VLIB_BUFFER_IS_TRACED)) |
| 1643 | continue; |
| 1644 | tc = |
| 1645 | tcp_half_open_connection_get (vnet_buffer (b)->tcp.connection_index); |
| 1646 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
| 1647 | tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1); |
| 1648 | } |
| 1649 | } |
| 1650 | |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1651 | always_inline void |
| 1652 | tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4) |
| 1653 | { |
| 1654 | vnet_main_t *vnm = vnet_get_main (); |
| 1655 | const dpo_id_t *dpo; |
| 1656 | const load_balance_t *lb; |
| 1657 | vnet_hw_interface_t *hw_if; |
| 1658 | u32 sw_if_idx, lb_idx; |
| 1659 | |
| 1660 | if (is_ipv4) |
| 1661 | { |
| 1662 | ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4); |
| 1663 | lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr); |
| 1664 | } |
| 1665 | else |
| 1666 | { |
| 1667 | ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6); |
| 1668 | lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr); |
| 1669 | } |
| 1670 | |
| 1671 | lb = load_balance_get (lb_idx); |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1672 | if (PREDICT_FALSE (lb->lb_n_buckets > 1)) |
| 1673 | return; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1674 | dpo = load_balance_get_bucket_i (lb, 0); |
| 1675 | |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1676 | sw_if_idx = dpo_get_urpf (dpo); |
| 1677 | if (PREDICT_FALSE (sw_if_idx == ~0)) |
| 1678 | return; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1679 | |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1680 | hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx); |
Damjan Marion | d4f88cc | 2022-01-05 01:52:38 +0100 | [diff] [blame] | 1681 | if (hw_if->caps & VNET_HW_IF_CAP_TCP_GSO) |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1682 | tc->cfg_flags |= TCP_CFG_F_TSO; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1683 | } |
| 1684 | |
Filip Tehlar | bc4dc16 | 2023-04-17 12:22:12 +0200 | [diff] [blame] | 1685 | static void |
| 1686 | tcp_input_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 1687 | vlib_buffer_t **bs, u16 *nexts, u32 n_bufs, u8 is_ip4) |
| 1688 | { |
| 1689 | tcp_connection_t *tc; |
| 1690 | tcp_header_t *tcp; |
| 1691 | tcp_rx_trace_t *t; |
| 1692 | u8 flags; |
| 1693 | int i; |
| 1694 | |
| 1695 | for (i = 0; i < n_bufs; i++) |
| 1696 | { |
| 1697 | if (!(bs[i]->flags & VLIB_BUFFER_IS_TRACED)) |
| 1698 | continue; |
| 1699 | |
| 1700 | t = vlib_add_trace (vm, node, bs[i], sizeof (*t)); |
| 1701 | if (nexts[i] == TCP_INPUT_NEXT_DROP || nexts[i] == TCP_INPUT_NEXT_PUNT || |
| 1702 | nexts[i] == TCP_INPUT_NEXT_RESET) |
| 1703 | { |
| 1704 | tc = 0; |
| 1705 | } |
| 1706 | else |
| 1707 | { |
| 1708 | flags = vnet_buffer (bs[i])->tcp.flags; |
| 1709 | |
| 1710 | if (flags == TCP_STATE_LISTEN) |
| 1711 | tc = tcp_listener_get (vnet_buffer (bs[i])->tcp.connection_index); |
| 1712 | else if (flags == TCP_STATE_SYN_SENT) |
| 1713 | tc = tcp_half_open_connection_get ( |
| 1714 | vnet_buffer (bs[i])->tcp.connection_index); |
| 1715 | else |
| 1716 | tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index, |
| 1717 | vm->thread_index); |
| 1718 | } |
| 1719 | tcp = tcp_buffer_hdr (bs[i]); |
| 1720 | tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4); |
| 1721 | } |
| 1722 | } |
| 1723 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1724 | always_inline uword |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1725 | tcp46_syn_sent_inline (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 1726 | vlib_frame_t *frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1727 | { |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 1728 | u32 n_left_from, *from, thread_index = vm->thread_index; |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1729 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1730 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1731 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1732 | from = vlib_frame_vector_args (frame); |
| 1733 | n_left_from = frame->n_vectors; |
| 1734 | |
| 1735 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 1736 | tcp46_syn_sent_trace_frame (vm, node, from, n_left_from); |
| 1737 | |
| 1738 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 1739 | b = bufs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1740 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1741 | while (n_left_from > 0) |
| 1742 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1743 | u32 ack, seq, error = TCP_ERROR_NONE; |
| 1744 | tcp_connection_t *tc, *new_tc; |
| 1745 | tcp_header_t *tcp; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1746 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1747 | tc = tcp_half_open_connection_get ( |
| 1748 | vnet_buffer (b[0])->tcp.connection_index); |
| 1749 | if (PREDICT_FALSE (tc == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1750 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1751 | error = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1752 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1753 | } |
| 1754 | |
Ivan Shvedunov | 4beb1c6 | 2021-01-16 03:43:01 +0300 | [diff] [blame] | 1755 | /* Half-open completed or cancelled recently but the connection |
| 1756 | * was't removed yet by the owning thread */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1757 | if (PREDICT_FALSE (tc->flags & TCP_CONN_HALF_OPEN_DONE)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1758 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1759 | error = TCP_ERROR_SPURIOUS_SYN_ACK; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1760 | goto drop; |
| 1761 | } |
| 1762 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1763 | ack = vnet_buffer (b[0])->tcp.ack_number; |
| 1764 | seq = vnet_buffer (b[0])->tcp.seq_number; |
| 1765 | tcp = tcp_buffer_hdr (b[0]); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1766 | |
| 1767 | /* Crude check to see if the connection handle does not match |
| 1768 | * the packet. Probably connection just switched to established */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1769 | if (PREDICT_FALSE (tcp->dst_port != tc->c_lcl_port || |
| 1770 | tcp->src_port != tc->c_rmt_port)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1771 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1772 | error = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1773 | goto drop; |
| 1774 | } |
| 1775 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1776 | if (PREDICT_FALSE (!tcp_ack (tcp) && !tcp_rst (tcp) && !tcp_syn (tcp))) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1777 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1778 | error = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1779 | goto drop; |
| 1780 | } |
| 1781 | |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1782 | /* SYNs consume sequence numbers */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1783 | vnet_buffer (b[0])->tcp.seq_end += tcp_is_syn (tcp); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1784 | |
| 1785 | /* |
| 1786 | * 1. check the ACK bit |
| 1787 | */ |
| 1788 | |
| 1789 | /* |
| 1790 | * If the ACK bit is set |
| 1791 | * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless |
| 1792 | * the RST bit is set, if so drop the segment and return) |
| 1793 | * <SEQ=SEG.ACK><CTL=RST> |
| 1794 | * and discard the segment. Return. |
| 1795 | * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. |
| 1796 | */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1797 | if (tcp_ack (tcp)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1798 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1799 | if (seq_leq (ack, tc->iss) || seq_gt (ack, tc->snd_nxt)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1800 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1801 | if (!tcp_rst (tcp)) |
| 1802 | tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4); |
| 1803 | error = TCP_ERROR_RCV_WND; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1804 | goto drop; |
| 1805 | } |
| 1806 | |
| 1807 | /* Make sure ACK is valid */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1808 | if (seq_gt (tc->snd_una, ack)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1809 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1810 | error = TCP_ERROR_ACK_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1811 | goto drop; |
| 1812 | } |
| 1813 | } |
| 1814 | |
| 1815 | /* |
| 1816 | * 2. check the RST bit |
| 1817 | */ |
| 1818 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1819 | if (tcp_rst (tcp)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1820 | { |
| 1821 | /* If ACK is acceptable, signal client that peer is not |
| 1822 | * willing to accept connection and drop connection*/ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1823 | if (tcp_ack (tcp)) |
| 1824 | tcp_rcv_rst (wrk, tc); |
| 1825 | error = TCP_ERROR_RST_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1826 | goto drop; |
| 1827 | } |
| 1828 | |
| 1829 | /* |
| 1830 | * 3. check the security and precedence (skipped) |
| 1831 | */ |
| 1832 | |
| 1833 | /* |
| 1834 | * 4. check the SYN bit |
| 1835 | */ |
| 1836 | |
| 1837 | /* No SYN flag. Drop. */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1838 | if (!tcp_syn (tcp)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1839 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1840 | error = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1841 | goto drop; |
| 1842 | } |
| 1843 | |
| 1844 | /* Parse options */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1845 | if (tcp_options_parse (tcp, &tc->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1846 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1847 | error = TCP_ERROR_OPTIONS; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1848 | goto drop; |
| 1849 | } |
| 1850 | |
| 1851 | /* Valid SYN or SYN-ACK. Move connection from half-open pool to |
| 1852 | * current thread pool. */ |
Florin Coras | 57b2e4a | 2021-07-06 08:25:36 -0700 | [diff] [blame] | 1853 | new_tc = tcp_connection_alloc_w_base (thread_index, &tc); |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1854 | new_tc->rcv_nxt = vnet_buffer (b[0])->tcp.seq_end; |
| 1855 | new_tc->irs = seq; |
| 1856 | new_tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1857 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1858 | if (tcp_opts_tstamp (&new_tc->rcv_opts)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1859 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1860 | new_tc->tsval_recent = new_tc->rcv_opts.tsval; |
| 1861 | new_tc->tsval_recent_age = tcp_time_tstamp (thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1862 | } |
| 1863 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1864 | if (tcp_opts_wscale (&new_tc->rcv_opts)) |
| 1865 | new_tc->snd_wscale = new_tc->rcv_opts.wscale; |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 1866 | else |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1867 | new_tc->rcv_wscale = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1868 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1869 | new_tc->snd_wnd = clib_net_to_host_u16 (tcp->window) |
| 1870 | << new_tc->snd_wscale; |
| 1871 | new_tc->snd_wl1 = seq; |
| 1872 | new_tc->snd_wl2 = ack; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1873 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1874 | tcp_connection_init_vars (new_tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1875 | |
| 1876 | /* SYN-ACK: See if we can switch to ESTABLISHED state */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1877 | if (PREDICT_TRUE (tcp_ack (tcp))) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1878 | { |
| 1879 | /* Our SYN is ACKed: we have iss < ack = snd_una */ |
| 1880 | |
| 1881 | /* TODO Dequeue acknowledged segments if we support Fast Open */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1882 | new_tc->snd_una = ack; |
| 1883 | new_tc->state = TCP_STATE_ESTABLISHED; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1884 | |
| 1885 | /* Make sure las is initialized for the wnd computation */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1886 | new_tc->rcv_las = new_tc->rcv_nxt; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1887 | |
| 1888 | /* Notify app that we have connection. If session layer can't |
| 1889 | * allocate session send reset */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1890 | if (session_stream_connect_notify (&new_tc->connection, |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1891 | SESSION_E_NONE)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1892 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1893 | tcp_send_reset_w_pkt (new_tc, b[0], thread_index, is_ip4); |
Florin Coras | ea309c4 | 2023-10-26 08:46:46 -0700 | [diff] [blame] | 1894 | tcp_program_cleanup (wrk, new_tc); |
| 1895 | new_tc->state = TCP_STATE_CLOSED; |
| 1896 | new_tc->c_s_index = ~0; |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1897 | error = TCP_ERROR_CREATE_SESSION_FAIL; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1898 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1899 | } |
| 1900 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1901 | transport_fifos_init_ooo (&new_tc->connection); |
| 1902 | new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1903 | /* Update rtt with the syn-ack sample */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1904 | tcp_estimate_initial_rtt (new_tc); |
| 1905 | TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc); |
| 1906 | error = TCP_ERROR_SYN_ACKS_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1907 | } |
| 1908 | /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ |
| 1909 | else |
| 1910 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1911 | new_tc->state = TCP_STATE_SYN_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1912 | |
| 1913 | /* Notify app that we have connection */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1914 | if (session_stream_connect_notify (&new_tc->connection, |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1915 | SESSION_E_NONE)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1916 | { |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1917 | tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4); |
Florin Coras | ea309c4 | 2023-10-26 08:46:46 -0700 | [diff] [blame] | 1918 | tcp_program_cleanup (wrk, new_tc); |
| 1919 | new_tc->state = TCP_STATE_CLOSED; |
| 1920 | new_tc->c_s_index = ~0; |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1921 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
| 1922 | error = TCP_ERROR_CREATE_SESSION_FAIL; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1923 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1924 | } |
| 1925 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1926 | transport_fifos_init_ooo (&new_tc->connection); |
| 1927 | new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection); |
| 1928 | new_tc->rtt_ts = 0; |
| 1929 | tcp_init_snd_vars (new_tc); |
| 1930 | tcp_send_synack (new_tc); |
| 1931 | error = TCP_ERROR_SYNS_RCVD; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1932 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1933 | } |
| 1934 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1935 | if (!(new_tc->cfg_flags & TCP_CFG_F_NO_TSO)) |
| 1936 | tcp_check_tx_offload (new_tc, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1937 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1938 | /* Read data, if any */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1939 | if (PREDICT_FALSE (vnet_buffer (b[0])->tcp.data_len)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1940 | { |
| 1941 | clib_warning ("rcvd data in syn-sent"); |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1942 | error = tcp_segment_rcv (wrk, new_tc, b[0]); |
| 1943 | if (error == TCP_ERROR_ACK_OK) |
| 1944 | error = TCP_ERROR_SYN_ACKS_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1945 | } |
| 1946 | else |
| 1947 | { |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1948 | /* Send ack now instead of programming it because connection was |
| 1949 | * just established and it's not optional. */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1950 | tcp_send_ack (new_tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1951 | } |
| 1952 | |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1953 | cleanup_ho: |
| 1954 | |
| 1955 | /* If this is not the owning thread, wait for syn retransmit to |
| 1956 | * expire and cleanup then */ |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1957 | if (tcp_half_open_connection_cleanup (tc)) |
| 1958 | tc->flags |= TCP_CONN_HALF_OPEN_DONE; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1959 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1960 | drop: |
| 1961 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1962 | b += 1; |
| 1963 | n_left_from -= 1; |
| 1964 | tcp_inc_counter (syn_sent, error, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1965 | } |
| 1966 | |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 1967 | session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index); |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1968 | vlib_buffer_free (vm, from, frame->n_vectors); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1969 | tcp_handle_disconnects (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1970 | |
Florin Coras | b636abe | 2021-05-04 17:08:49 -0700 | [diff] [blame] | 1971 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1972 | } |
| 1973 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1974 | VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm, |
| 1975 | vlib_node_runtime_t * node, |
| 1976 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1977 | { |
| 1978 | return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 1979 | } |
| 1980 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1981 | VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm, |
| 1982 | vlib_node_runtime_t * node, |
| 1983 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1984 | { |
| 1985 | return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 1986 | } |
| 1987 | |
| 1988 | /* *INDENT-OFF* */ |
| 1989 | VLIB_REGISTER_NODE (tcp4_syn_sent_node) = |
| 1990 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1991 | .name = "tcp4-syn-sent", |
| 1992 | /* Takes a vector of packets. */ |
| 1993 | .vector_size = sizeof (u32), |
| 1994 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 1995 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1996 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1997 | }; |
| 1998 | /* *INDENT-ON* */ |
| 1999 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2000 | /* *INDENT-OFF* */ |
| 2001 | VLIB_REGISTER_NODE (tcp6_syn_sent_node) = |
| 2002 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2003 | .name = "tcp6-syn-sent", |
| 2004 | /* Takes a vector of packets. */ |
| 2005 | .vector_size = sizeof (u32), |
| 2006 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2007 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2008 | .format_trace = format_tcp_rx_trace_short, |
| 2009 | }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2010 | /* *INDENT-ON* */ |
| 2011 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2012 | static void |
| 2013 | tcp46_rcv_process_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 2014 | u32 *from, u32 n_bufs) |
| 2015 | { |
| 2016 | u32 thread_index = vm->thread_index; |
| 2017 | tcp_connection_t *tc = 0; |
| 2018 | tcp_rx_trace_t *t; |
| 2019 | vlib_buffer_t *b; |
| 2020 | int i; |
| 2021 | |
| 2022 | for (i = 0; i < n_bufs; i++) |
| 2023 | { |
| 2024 | b = vlib_get_buffer (vm, from[i]); |
| 2025 | if (!(b->flags & VLIB_BUFFER_IS_TRACED)) |
| 2026 | continue; |
| 2027 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2028 | thread_index); |
| 2029 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
| 2030 | tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1); |
| 2031 | } |
| 2032 | } |
| 2033 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2034 | /** |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2035 | * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2036 | * as per RFC793 p. 64 |
| 2037 | */ |
| 2038 | always_inline uword |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2039 | tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 2040 | vlib_frame_t *frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2041 | { |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 2042 | u32 thread_index = vm->thread_index, n_left_from, *from, max_deq; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2043 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2044 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2045 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2046 | from = vlib_frame_vector_args (frame); |
| 2047 | n_left_from = frame->n_vectors; |
| 2048 | |
| 2049 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2050 | tcp46_rcv_process_trace_frame (vm, node, from, n_left_from); |
| 2051 | |
| 2052 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2053 | b = bufs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2054 | |
| 2055 | while (n_left_from > 0) |
| 2056 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2057 | u32 error = TCP_ERROR_NONE; |
| 2058 | tcp_header_t *tcp = 0; |
| 2059 | tcp_connection_t *tc; |
| 2060 | u8 is_fin; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2061 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2062 | tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2063 | thread_index); |
| 2064 | if (PREDICT_FALSE (tc == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2065 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2066 | error = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2067 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2068 | } |
| 2069 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2070 | tcp = tcp_buffer_hdr (b[0]); |
| 2071 | is_fin = tcp_is_fin (tcp); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2072 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2073 | if (CLIB_DEBUG) |
| 2074 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2075 | if (!(tc->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2076 | { |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2077 | tcp_connection_t *tmp; |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2078 | tmp = tcp_lookup_connection (tc->c_fib_index, b[0], thread_index, |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2079 | is_ip4); |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2080 | if (tmp->state != tc->state) |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2081 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2082 | if (tc->state != TCP_STATE_CLOSED) |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2083 | clib_warning ("state changed"); |
| 2084 | goto drop; |
| 2085 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2086 | } |
| 2087 | } |
| 2088 | |
| 2089 | /* |
| 2090 | * Special treatment for CLOSED |
| 2091 | */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2092 | if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2093 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2094 | error = TCP_ERROR_CONNECTION_CLOSED; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2095 | goto drop; |
| 2096 | } |
| 2097 | |
| 2098 | /* |
| 2099 | * For all other states (except LISTEN) |
| 2100 | */ |
| 2101 | |
| 2102 | /* 1-4: check SEQ, RST, SYN */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2103 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], tcp, &error))) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2104 | goto drop; |
| 2105 | |
| 2106 | /* 5: check the ACK field */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2107 | switch (tc->state) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2108 | { |
| 2109 | case TCP_STATE_SYN_RCVD: |
| 2110 | /* |
| 2111 | * If the segment acknowledgment is not acceptable, form a |
| 2112 | * reset segment, |
| 2113 | * <SEQ=SEG.ACK><CTL=RST> |
| 2114 | * and send it. |
| 2115 | */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2116 | if (tcp_rcv_ack_no_cc (tc, b[0], &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2117 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2118 | tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4); |
| 2119 | error = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 4850e3e | 2018-12-12 14:34:38 -0800 | [diff] [blame] | 2120 | goto drop; |
| 2121 | } |
| 2122 | |
Florin Coras | da2ae9a | 2023-10-14 15:16:18 -0700 | [diff] [blame] | 2123 | /* Avoid notifying app if connection is about to be closed */ |
| 2124 | if (PREDICT_FALSE (is_fin)) |
| 2125 | break; |
| 2126 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2127 | /* Update rtt and rto */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2128 | tcp_estimate_initial_rtt (tc); |
| 2129 | tcp_connection_tx_pacer_update (tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2130 | |
| 2131 | /* Switch state to ESTABLISHED */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2132 | tc->state = TCP_STATE_ESTABLISHED; |
| 2133 | TCP_EVT (TCP_EVT_STATE_CHANGE, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2134 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2135 | if (!(tc->cfg_flags & TCP_CFG_F_NO_TSO)) |
| 2136 | tcp_check_tx_offload (tc, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2137 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2138 | /* Initialize session variables */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2139 | tc->snd_una = vnet_buffer (b[0])->tcp.ack_number; |
| 2140 | tc->snd_wnd = clib_net_to_host_u16 (tcp->window) |
| 2141 | << tc->rcv_opts.wscale; |
| 2142 | tc->snd_wl1 = vnet_buffer (b[0])->tcp.seq_number; |
| 2143 | tc->snd_wl2 = vnet_buffer (b[0])->tcp.ack_number; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2144 | |
| 2145 | /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2146 | tcp_retransmit_timer_reset (&wrk->timer_wheel, tc); |
| 2147 | if (session_stream_accept_notify (&tc->connection)) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2148 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2149 | error = TCP_ERROR_MSG_QUEUE_FULL; |
| 2150 | tcp_send_reset (tc); |
| 2151 | session_transport_delete_notify (&tc->connection); |
| 2152 | tcp_connection_cleanup (tc); |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2153 | goto drop; |
| 2154 | } |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2155 | error = TCP_ERROR_ACK_OK; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2156 | break; |
| 2157 | case TCP_STATE_ESTABLISHED: |
| 2158 | /* We can get packets in established state here because they |
| 2159 | * were enqueued before state change */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2160 | if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2161 | goto drop; |
| 2162 | |
| 2163 | break; |
| 2164 | case TCP_STATE_FIN_WAIT_1: |
| 2165 | /* In addition to the processing for the ESTABLISHED state, if |
| 2166 | * our FIN is now acknowledged then enter FIN-WAIT-2 and |
| 2167 | * continue processing in that state. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2168 | if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2169 | goto drop; |
| 2170 | |
| 2171 | /* Still have to send the FIN */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2172 | if (tc->flags & TCP_CONN_FINPNDG) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2173 | { |
| 2174 | /* TX fifo finally drained */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2175 | max_deq = transport_max_tx_dequeue (&tc->connection); |
| 2176 | if (max_deq <= tc->burst_acked) |
| 2177 | tcp_send_fin (tc); |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2178 | /* If a fin was received and data was acked extend wait */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2179 | else if ((tc->flags & TCP_CONN_FINRCVD) && tc->bytes_acked) |
| 2180 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2181 | tcp_cfg.closewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2182 | } |
| 2183 | /* If FIN is ACKed */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2184 | else if (tc->snd_una == tc->snd_nxt) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2185 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2186 | /* Stop all retransmit timers because we have nothing more |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2187 | * to send. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2188 | tcp_connection_timers_reset (tc); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2189 | |
| 2190 | /* We already have a FIN but didn't transition to CLOSING |
| 2191 | * because of outstanding tx data. Close the connection. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2192 | if (tc->flags & TCP_CONN_FINRCVD) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2193 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2194 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 2195 | session_transport_closed_notify (&tc->connection); |
| 2196 | tcp_program_cleanup (wrk, tc); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2197 | goto drop; |
| 2198 | } |
| 2199 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2200 | tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_2); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2201 | /* Enable waitclose because we're willing to wait for peer's |
| 2202 | * FIN but not indefinitely. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2203 | tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2204 | tcp_cfg.finwait2_time); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2205 | |
| 2206 | /* Don't try to deq the FIN acked */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2207 | if (tc->burst_acked > 1) |
| 2208 | session_tx_fifo_dequeue_drop (&tc->connection, |
| 2209 | tc->burst_acked - 1); |
| 2210 | tc->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2211 | } |
| 2212 | break; |
| 2213 | case TCP_STATE_FIN_WAIT_2: |
| 2214 | /* In addition to the processing for the ESTABLISHED state, if |
| 2215 | * the retransmission queue is empty, the user's CLOSE can be |
| 2216 | * acknowledged ("ok") but do not delete the TCB. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2217 | if (tcp_rcv_ack_no_cc (tc, b[0], &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2218 | goto drop; |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2219 | tc->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2220 | break; |
| 2221 | case TCP_STATE_CLOSE_WAIT: |
| 2222 | /* Do the same processing as for the ESTABLISHED state. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2223 | if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2224 | goto drop; |
| 2225 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2226 | if (!(tc->flags & TCP_CONN_FINPNDG)) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2227 | break; |
| 2228 | |
| 2229 | /* Still have outstanding tx data */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2230 | max_deq = transport_max_tx_dequeue (&tc->connection); |
| 2231 | if (max_deq > tc->burst_acked) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2232 | break; |
| 2233 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2234 | tcp_send_fin (tc); |
| 2235 | tcp_connection_timers_reset (tc); |
| 2236 | tcp_connection_set_state (tc, TCP_STATE_LAST_ACK); |
| 2237 | tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2238 | tcp_cfg.lastack_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2239 | break; |
| 2240 | case TCP_STATE_CLOSING: |
| 2241 | /* In addition to the processing for the ESTABLISHED state, if |
| 2242 | * the ACK acknowledges our FIN then enter the TIME-WAIT state, |
| 2243 | * otherwise ignore the segment. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2244 | if (tcp_rcv_ack_no_cc (tc, b[0], &error)) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2245 | goto drop; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 2246 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2247 | if (tc->snd_una != tc->snd_nxt) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2248 | goto drop; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2249 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2250 | tcp_connection_timers_reset (tc); |
| 2251 | tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT); |
| 2252 | tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2253 | tcp_cfg.timewait_time); |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2254 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2255 | goto drop; |
| 2256 | |
| 2257 | break; |
| 2258 | case TCP_STATE_LAST_ACK: |
| 2259 | /* The only thing that [should] arrive in this state is an |
| 2260 | * acknowledgment of our FIN. If our FIN is now acknowledged, |
| 2261 | * delete the TCB, enter the CLOSED state, and return. */ |
| 2262 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2263 | if (tcp_rcv_ack_no_cc (tc, b[0], &error)) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2264 | goto drop; |
| 2265 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2266 | /* Apparently our ACK for the peer's FIN was lost */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2267 | if (is_fin && tc->snd_una != tc->snd_nxt) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2268 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2269 | tcp_send_fin (tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2270 | goto drop; |
| 2271 | } |
| 2272 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2273 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 2274 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2275 | |
| 2276 | /* Don't free the connection from the data path since |
| 2277 | * we can't ensure that we have no packets already enqueued |
| 2278 | * to output. Rely instead on the waitclose timer */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2279 | tcp_connection_timers_reset (tc); |
| 2280 | tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2281 | |
| 2282 | goto drop; |
| 2283 | |
| 2284 | break; |
| 2285 | case TCP_STATE_TIME_WAIT: |
| 2286 | /* The only thing that can arrive in this state is a |
| 2287 | * retransmission of the remote FIN. Acknowledge it, and restart |
| 2288 | * the 2 MSL timeout. */ |
| 2289 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2290 | if (tcp_rcv_ack_no_cc (tc, b[0], &error)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2291 | goto drop; |
| 2292 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2293 | if (!is_fin) |
Florin Coras | 37db430 | 2019-03-13 13:25:57 -0700 | [diff] [blame] | 2294 | goto drop; |
| 2295 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2296 | tcp_program_ack (tc); |
| 2297 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2298 | tcp_cfg.timewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2299 | goto drop; |
| 2300 | |
| 2301 | break; |
| 2302 | default: |
| 2303 | ASSERT (0); |
| 2304 | } |
| 2305 | |
| 2306 | /* 6: check the URG bit TODO */ |
| 2307 | |
| 2308 | /* 7: process the segment text */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2309 | switch (tc->state) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2310 | { |
| 2311 | case TCP_STATE_ESTABLISHED: |
| 2312 | case TCP_STATE_FIN_WAIT_1: |
| 2313 | case TCP_STATE_FIN_WAIT_2: |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2314 | if (vnet_buffer (b[0])->tcp.data_len) |
| 2315 | error = tcp_segment_rcv (wrk, tc, b[0]); |
Florin Coras | c67724a | 2020-11-06 14:21:26 -0800 | [diff] [blame] | 2316 | /* Don't accept out of order fins lower */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2317 | if (vnet_buffer (b[0])->tcp.seq_end != tc->rcv_nxt) |
Florin Coras | c67724a | 2020-11-06 14:21:26 -0800 | [diff] [blame] | 2318 | goto drop; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2319 | break; |
| 2320 | case TCP_STATE_CLOSE_WAIT: |
| 2321 | case TCP_STATE_CLOSING: |
| 2322 | case TCP_STATE_LAST_ACK: |
| 2323 | case TCP_STATE_TIME_WAIT: |
| 2324 | /* This should not occur, since a FIN has been received from the |
| 2325 | * remote side. Ignore the segment text. */ |
| 2326 | break; |
| 2327 | } |
| 2328 | |
| 2329 | /* 8: check the FIN bit */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2330 | if (!is_fin) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2331 | goto drop; |
| 2332 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2333 | TCP_EVT (TCP_EVT_FIN_RCVD, tc); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2334 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2335 | switch (tc->state) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2336 | { |
| 2337 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2338 | /* Account for the FIN and send ack */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2339 | tc->rcv_nxt += 1; |
| 2340 | tcp_program_ack (tc); |
| 2341 | tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT); |
| 2342 | tcp_program_disconnect (wrk, tc); |
| 2343 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2344 | tcp_cfg.closewait_time); |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 2345 | break; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2346 | case TCP_STATE_SYN_RCVD: |
Florin Coras | da2ae9a | 2023-10-14 15:16:18 -0700 | [diff] [blame] | 2347 | /* Send FIN-ACK and enter TIME-WAIT, as opposed to LAST-ACK, |
| 2348 | * because the app was not notified yet and we want to avoid |
| 2349 | * session state transitions to ensure cleanup does not |
| 2350 | * propagate to app. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2351 | tcp_connection_timers_reset (tc); |
| 2352 | tc->rcv_nxt += 1; |
| 2353 | tcp_send_fin (tc); |
Florin Coras | da2ae9a | 2023-10-14 15:16:18 -0700 | [diff] [blame] | 2354 | tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT); |
| 2355 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2356 | break; |
| 2357 | case TCP_STATE_CLOSE_WAIT: |
| 2358 | case TCP_STATE_CLOSING: |
| 2359 | case TCP_STATE_LAST_ACK: |
| 2360 | /* move along .. */ |
| 2361 | break; |
| 2362 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2363 | tc->rcv_nxt += 1; |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2364 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2365 | if (tc->flags & TCP_CONN_FINPNDG) |
Florin Coras | 565115e | 2019-02-20 19:48:31 -0800 | [diff] [blame] | 2366 | { |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2367 | /* If data is outstanding, stay in FIN_WAIT_1 and try to finish |
| 2368 | * sending it. Since we already received a fin, do not wait |
| 2369 | * for too long. */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2370 | tc->flags |= TCP_CONN_FINRCVD; |
| 2371 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2372 | tcp_cfg.closewait_time); |
Florin Coras | 565115e | 2019-02-20 19:48:31 -0800 | [diff] [blame] | 2373 | } |
| 2374 | else |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2375 | { |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2376 | tcp_connection_set_state (tc, TCP_STATE_CLOSING); |
| 2377 | tcp_program_ack (tc); |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2378 | /* Wait for ACK for our FIN but not forever */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2379 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2380 | tcp_cfg.closing_time); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2381 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2382 | break; |
| 2383 | case TCP_STATE_FIN_WAIT_2: |
| 2384 | /* Got FIN, send ACK! Be more aggressive with resource cleanup */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2385 | tc->rcv_nxt += 1; |
| 2386 | tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT); |
| 2387 | tcp_connection_timers_reset (tc); |
| 2388 | tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2389 | tcp_cfg.timewait_time); |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2390 | tcp_program_ack (tc); |
| 2391 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2392 | break; |
| 2393 | case TCP_STATE_TIME_WAIT: |
| 2394 | /* Remain in the TIME-WAIT state. Restart the time-wait |
| 2395 | * timeout. |
| 2396 | */ |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2397 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2398 | tcp_cfg.timewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2399 | break; |
| 2400 | } |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2401 | error = TCP_ERROR_FIN_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2402 | |
| 2403 | drop: |
| 2404 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2405 | b += 1; |
| 2406 | n_left_from -= 1; |
| 2407 | tcp_inc_counter (rcv_process, error, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2408 | } |
| 2409 | |
Florin Coras | 0242d30 | 2022-12-22 15:03:44 -0800 | [diff] [blame] | 2410 | session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2411 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | 79fdfd6 | 2019-05-23 06:19:09 -0700 | [diff] [blame] | 2412 | tcp_handle_disconnects (wrk); |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2413 | vlib_buffer_free (vm, from, frame->n_vectors); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2414 | |
Florin Coras | 9592909 | 2021-05-04 19:30:58 -0700 | [diff] [blame] | 2415 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2416 | } |
| 2417 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2418 | VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm, |
| 2419 | vlib_node_runtime_t * node, |
| 2420 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2421 | { |
| 2422 | return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2423 | } |
| 2424 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2425 | VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm, |
| 2426 | vlib_node_runtime_t * node, |
| 2427 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2428 | { |
| 2429 | return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2430 | } |
| 2431 | |
| 2432 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2433 | VLIB_REGISTER_NODE (tcp4_rcv_process_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2434 | .name = "tcp4-rcv-process", |
| 2435 | /* Takes a vector of packets. */ |
| 2436 | .vector_size = sizeof (u32), |
| 2437 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2438 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2439 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2440 | }; |
| 2441 | /* *INDENT-ON* */ |
| 2442 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2443 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2444 | VLIB_REGISTER_NODE (tcp6_rcv_process_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2445 | .name = "tcp6-rcv-process", |
| 2446 | /* Takes a vector of packets. */ |
| 2447 | .vector_size = sizeof (u32), |
| 2448 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2449 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2450 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2451 | }; |
| 2452 | /* *INDENT-ON* */ |
| 2453 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2454 | static void |
| 2455 | tcp46_listen_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 2456 | u32 *to_next, u32 n_bufs) |
| 2457 | { |
| 2458 | tcp_connection_t *tc = 0; |
| 2459 | tcp_rx_trace_t *t; |
| 2460 | vlib_buffer_t *b; |
| 2461 | int i; |
| 2462 | |
| 2463 | for (i = 0; i < n_bufs; i++) |
| 2464 | { |
| 2465 | b = vlib_get_buffer (vm, to_next[i]); |
| 2466 | if (!(b->flags & VLIB_BUFFER_IS_TRACED)) |
| 2467 | continue; |
| 2468 | if (vnet_buffer (b)->tcp.flags == TCP_STATE_LISTEN) |
| 2469 | tc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index); |
| 2470 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
| 2471 | tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1); |
| 2472 | } |
| 2473 | } |
| 2474 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2475 | /** |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2476 | * SYN received in TIME-WAIT state. |
| 2477 | * |
| 2478 | * RFC 1122: |
| 2479 | * "When a connection is [...] on TIME-WAIT state [...] |
| 2480 | * [a TCP] MAY accept a new SYN from the remote TCP to |
| 2481 | * reopen the connection directly, if it: |
| 2482 | * |
| 2483 | * (1) assigns its initial sequence number for the new |
| 2484 | * connection to be larger than the largest sequence |
| 2485 | * number it used on the previous connection incarnation, |
| 2486 | * and |
| 2487 | * |
| 2488 | * (2) returns to TIME-WAIT state if the SYN turns out |
| 2489 | * to be an old duplicate". |
| 2490 | * |
| 2491 | * The function returns true if the syn can be accepted during |
| 2492 | * connection time-wait (port reuse). In this case the function |
| 2493 | * also calculates what the iss should be for the new connection. |
| 2494 | */ |
| 2495 | always_inline int |
| 2496 | syn_during_timewait (tcp_connection_t *tc, vlib_buffer_t *b, u32 *iss) |
| 2497 | { |
| 2498 | int paws_reject = tcp_segment_check_paws (tc); |
| 2499 | u32 tw_iss; |
| 2500 | |
| 2501 | *iss = 0; |
| 2502 | /* Check that the SYN arrived out of window. We accept it */ |
| 2503 | if (!paws_reject && |
| 2504 | (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt) || |
| 2505 | (tcp_opts_tstamp (&tc->rcv_opts) && |
| 2506 | timestamp_lt (tc->tsval_recent, tc->rcv_opts.tsval)))) |
| 2507 | { |
| 2508 | /* Set the iss of the new connection to be the largest sequence number |
| 2509 | * the old peer would have accepted and add some random number |
| 2510 | */ |
| 2511 | tw_iss = tc->snd_nxt + tcp_available_snd_wnd (tc) + |
| 2512 | (uword) (tcp_time_now_us (tc->c_thread_index) * 1e6) % 65535; |
| 2513 | if (tw_iss == 0) |
| 2514 | tw_iss++; |
| 2515 | *iss = tw_iss; |
| 2516 | |
| 2517 | return 1; |
| 2518 | } |
| 2519 | else |
| 2520 | { |
| 2521 | TCP_DBG ( |
| 2522 | "ERROR not accepting SYN in timewait,paws_reject=%d, seq_num =%ld, " |
| 2523 | "rcv_nxt=%ld, tstamp_present=%d, tsval_recent = %d, tsval = %d\n", |
| 2524 | paws_reject, vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt, |
| 2525 | tcp_opts_tstamp (&tc->rcv_opts), tc->tsval_recent, tc->rcv_opts.tsval); |
| 2526 | return 0; |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2531 | * LISTEN state processing as per RFC 793 p. 65 |
| 2532 | */ |
| 2533 | always_inline uword |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2534 | tcp46_listen_inline (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 2535 | vlib_frame_t *frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2536 | { |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2537 | u32 n_left_from, *from, n_syns = 0; |
| 2538 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2539 | u32 thread_index = vm->thread_index; |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2540 | u32 tw_iss = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2541 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2542 | from = vlib_frame_vector_args (frame); |
| 2543 | n_left_from = frame->n_vectors; |
| 2544 | |
| 2545 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2546 | tcp46_listen_trace_frame (vm, node, from, n_left_from); |
| 2547 | |
| 2548 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2549 | b = bufs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2550 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2551 | while (n_left_from > 0) |
| 2552 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2553 | tcp_connection_t *lc, *child; |
Florin Coras | de7fcac | 2020-01-16 04:04:54 +0000 | [diff] [blame] | 2554 | |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2555 | /* Flags initialized with connection state after lookup */ |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2556 | if (vnet_buffer (b[0])->tcp.flags == TCP_STATE_LISTEN) |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2557 | { |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2558 | lc = tcp_listener_get (vnet_buffer (b[0])->tcp.connection_index); |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2559 | } |
Florin Coras | 3ffc77d | 2023-02-16 18:59:38 -0800 | [diff] [blame] | 2560 | /* Probably we are in time-wait or closed state */ |
| 2561 | else |
Florin Coras | de7fcac | 2020-01-16 04:04:54 +0000 | [diff] [blame] | 2562 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2563 | tcp_connection_t *tc; |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2564 | tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2565 | thread_index); |
| 2566 | if (tc->state != TCP_STATE_TIME_WAIT) |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2567 | { |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2568 | tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2569 | goto done; |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2570 | } |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2571 | |
| 2572 | if (PREDICT_FALSE (!syn_during_timewait (tc, b[0], &tw_iss))) |
| 2573 | { |
| 2574 | /* This SYN can't be accepted */ |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2575 | tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1); |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2576 | goto done; |
| 2577 | } |
| 2578 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2579 | lc = tcp_lookup_listener (b[0], tc->c_fib_index, is_ip4); |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2580 | /* clean up the old session */ |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2581 | tcp_connection_del (tc); |
Florin Coras | 355791c | 2020-10-11 11:20:56 -0700 | [diff] [blame] | 2582 | /* listener was cleaned up */ |
| 2583 | if (!lc) |
| 2584 | { |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2585 | tcp_inc_counter (listen, TCP_ERROR_NO_LISTENER, 1); |
Florin Coras | 355791c | 2020-10-11 11:20:56 -0700 | [diff] [blame] | 2586 | goto done; |
| 2587 | } |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | /* Make sure connection wasn't just created */ |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2591 | child = |
| 2592 | tcp_lookup_connection (lc->c_fib_index, b[0], thread_index, is_ip4); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2593 | if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN)) |
| 2594 | { |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2595 | tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2596 | goto done; |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 2597 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2598 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2599 | /* Create child session. For syn-flood protection use filter */ |
| 2600 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2601 | /* 1. first check for an RST: handled by input dispatch */ |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2602 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2603 | /* 2. second check for an ACK: handled by input dispatch */ |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2604 | |
| 2605 | /* 3. check for a SYN (did that already) */ |
| 2606 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2607 | /* Create child session and send SYN-ACK */ |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2608 | child = tcp_connection_alloc (thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2609 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2610 | if (tcp_options_parse (tcp_buffer_hdr (b[0]), &child->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2611 | { |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2612 | tcp_inc_counter (listen, TCP_ERROR_OPTIONS, 1); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2613 | tcp_connection_free (child); |
| 2614 | goto done; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2615 | } |
| 2616 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2617 | tcp_init_w_buffer (child, b[0], is_ip4); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2618 | |
| 2619 | child->state = TCP_STATE_SYN_RCVD; |
| 2620 | child->c_fib_index = lc->c_fib_index; |
| 2621 | child->cc_algo = lc->cc_algo; |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2622 | |
| 2623 | /* In the regular case, the tw_iss will be zero, but |
| 2624 | * in the special case of syn arriving in time_wait state, the value |
| 2625 | * will be set according to rfc 1122 |
| 2626 | */ |
| 2627 | child->iss = tw_iss; |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2628 | tcp_connection_init_vars (child); |
| 2629 | child->rto = TCP_RTO_MIN; |
| 2630 | |
Ivan Shvedunov | 9fefa89 | 2020-07-27 19:59:38 +0300 | [diff] [blame] | 2631 | /* |
| 2632 | * This initializes elog track, must be done before synack. |
| 2633 | * We also do it before possible tcp_connection_cleanup() as it |
| 2634 | * generates TCP_EVT_DELETE event. |
| 2635 | */ |
| 2636 | TCP_EVT (TCP_EVT_SYN_RCVD, child, 1); |
| 2637 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2638 | if (session_stream_accept (&child->connection, lc->c_s_index, |
| 2639 | lc->c_thread_index, 0 /* notify */ )) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2640 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2641 | tcp_connection_cleanup (child); |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2642 | tcp_inc_counter (listen, TCP_ERROR_CREATE_SESSION_FAIL, 1); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2643 | goto done; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2644 | } |
| 2645 | |
Florin Coras | 8c4fa01 | 2020-11-06 16:59:08 -0800 | [diff] [blame] | 2646 | transport_fifos_init_ooo (&child->connection); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2647 | child->tx_fifo_size = transport_tx_fifo_size (&child->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2648 | |
Florin Coras | d2f5174 | 2020-07-24 09:49:46 -0700 | [diff] [blame] | 2649 | tcp_send_synack (child); |
Florin Coras | e8d6771 | 2022-03-15 21:46:34 -0700 | [diff] [blame] | 2650 | n_syns += 1; |
Florin Coras | d2f5174 | 2020-07-24 09:49:46 -0700 | [diff] [blame] | 2651 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2652 | done: |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2653 | b += 1; |
| 2654 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2655 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2656 | |
| 2657 | tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2658 | vlib_buffer_free (vm, from, frame->n_vectors); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2659 | |
Florin Coras | 7f969c7 | 2021-05-04 14:53:25 -0700 | [diff] [blame] | 2660 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2661 | } |
| 2662 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2663 | VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2664 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2665 | { |
| 2666 | return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2667 | } |
| 2668 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2669 | VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2670 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2671 | { |
| 2672 | return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2673 | } |
| 2674 | |
| 2675 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2676 | VLIB_REGISTER_NODE (tcp4_listen_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2677 | .name = "tcp4-listen", |
| 2678 | /* Takes a vector of packets. */ |
| 2679 | .vector_size = sizeof (u32), |
| 2680 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2681 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2682 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2683 | }; |
| 2684 | /* *INDENT-ON* */ |
| 2685 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2686 | /* *INDENT-OFF* */ |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2687 | VLIB_REGISTER_NODE (tcp6_listen_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2688 | .name = "tcp6-listen", |
| 2689 | /* Takes a vector of packets. */ |
| 2690 | .vector_size = sizeof (u32), |
| 2691 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2692 | .error_counters = tcp_input_error_counters, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2693 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2694 | }; |
| 2695 | /* *INDENT-ON* */ |
| 2696 | |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2697 | always_inline uword |
| 2698 | tcp46_drop_inline (vlib_main_t *vm, vlib_node_runtime_t *node, |
| 2699 | vlib_frame_t *frame, int is_ip4) |
| 2700 | { |
| 2701 | u32 *from = vlib_frame_vector_args (frame); |
| 2702 | |
| 2703 | /* Error counters must be incremented by previous nodes */ |
| 2704 | vlib_buffer_free (vm, from, frame->n_vectors); |
| 2705 | |
| 2706 | return frame->n_vectors; |
| 2707 | } |
| 2708 | |
| 2709 | VLIB_NODE_FN (tcp4_drop_node) |
| 2710 | (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) |
| 2711 | { |
| 2712 | return tcp46_drop_inline (vm, node, from_frame, 1 /* is_ip4 */); |
| 2713 | } |
| 2714 | |
| 2715 | VLIB_NODE_FN (tcp6_drop_node) |
| 2716 | (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) |
| 2717 | { |
| 2718 | return tcp46_drop_inline (vm, node, from_frame, 0 /* is_ip4 */); |
| 2719 | } |
| 2720 | |
| 2721 | VLIB_REGISTER_NODE (tcp4_drop_node) = { |
| 2722 | .name = "tcp4-drop", |
| 2723 | .vector_size = sizeof (u32), |
| 2724 | .n_errors = TCP_N_ERROR, |
| 2725 | .error_counters = tcp_input_error_counters, |
| 2726 | }; |
| 2727 | |
| 2728 | VLIB_REGISTER_NODE (tcp6_drop_node) = { |
| 2729 | .name = "tcp6-drop", |
| 2730 | .vector_size = sizeof (u32), |
| 2731 | .n_errors = TCP_N_ERROR, |
| 2732 | .error_counters = tcp_input_error_counters, |
| 2733 | }; |
| 2734 | |
| 2735 | #define foreach_tcp4_input_next \ |
| 2736 | _ (DROP, "tcp4-drop") \ |
| 2737 | _ (LISTEN, "tcp4-listen") \ |
| 2738 | _ (RCV_PROCESS, "tcp4-rcv-process") \ |
| 2739 | _ (SYN_SENT, "tcp4-syn-sent") \ |
| 2740 | _ (ESTABLISHED, "tcp4-established") \ |
| 2741 | _ (RESET, "tcp4-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2742 | _ (PUNT, "ip4-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2743 | |
Florin Coras | 9a1fbb5 | 2023-06-08 20:47:11 -0700 | [diff] [blame] | 2744 | #define foreach_tcp6_input_next \ |
| 2745 | _ (DROP, "tcp6-drop") \ |
| 2746 | _ (LISTEN, "tcp6-listen") \ |
| 2747 | _ (RCV_PROCESS, "tcp6-rcv-process") \ |
| 2748 | _ (SYN_SENT, "tcp6-syn-sent") \ |
| 2749 | _ (ESTABLISHED, "tcp6-established") \ |
| 2750 | _ (RESET, "tcp6-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2751 | _ (PUNT, "ip6-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2752 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2753 | #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) |
| 2754 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2755 | static void |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2756 | tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) |
| 2757 | { |
Florin Coras | b5e55a2 | 2019-01-10 12:42:47 -0800 | [diff] [blame] | 2758 | if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2759 | { |
| 2760 | *next = TCP_INPUT_NEXT_DROP; |
| 2761 | } |
| 2762 | else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6)) |
| 2763 | { |
| 2764 | *next = TCP_INPUT_NEXT_PUNT; |
| 2765 | *error = TCP_ERROR_PUNT; |
| 2766 | } |
| 2767 | else |
| 2768 | { |
| 2769 | *next = TCP_INPUT_NEXT_RESET; |
| 2770 | *error = TCP_ERROR_NO_LISTENER; |
| 2771 | } |
| 2772 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2773 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2774 | static inline void |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2775 | tcp_input_dispatch_buffer (tcp_main_t *tm, tcp_connection_t *tc, |
| 2776 | vlib_buffer_t *b, u16 *next, u16 *err_counters) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2777 | { |
| 2778 | tcp_header_t *tcp; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2779 | u32 error; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2780 | u8 flags; |
| 2781 | |
| 2782 | tcp = tcp_buffer_hdr (b); |
| 2783 | flags = tcp->flags & filter_flags; |
| 2784 | *next = tm->dispatch_table[tc->state][flags].next; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2785 | error = tm->dispatch_table[tc->state][flags].error; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2786 | tc->segs_in += 1; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2787 | |
Michal Kalderon | 3effadc | 2021-08-08 04:30:39 -0700 | [diff] [blame] | 2788 | /* Track connection state when packet was received. It is required |
| 2789 | * for @ref tcp46_listen_inline to detect whether we reached |
| 2790 | * the node as a result of a SYN packet received while in time-wait |
| 2791 | * state. In this case the connection_index in vnet buffer will point |
| 2792 | * to the existing tcp connection and not the listener |
| 2793 | */ |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2794 | vnet_buffer (b)->tcp.flags = tc->state; |
| 2795 | |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2796 | if (PREDICT_FALSE (error != TCP_ERROR_NONE)) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2797 | { |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2798 | tcp_inc_err_counter (err_counters, error, 1); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2799 | if (error == TCP_ERROR_DISPATCH) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2800 | clib_warning ("tcp conn %u disp error state %U flags %U", |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2801 | tc->c_c_index, format_tcp_state, tc->state, |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2802 | format_tcp_flags, (int) flags); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2803 | } |
| 2804 | } |
| 2805 | |
| 2806 | always_inline uword |
| 2807 | tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2808 | vlib_frame_t * frame, int is_ip4, u8 is_nolookup) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2809 | { |
| 2810 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2811 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 2812 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2813 | u16 nexts[VLIB_FRAME_SIZE], *next; |
Filip Tehlar | 5035bf0 | 2023-02-20 13:46:32 +0100 | [diff] [blame] | 2814 | u16 err_counters[TCP_N_ERROR] = { 0 }; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2815 | |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame] | 2816 | tcp_update_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2817 | |
| 2818 | from = vlib_frame_vector_args (frame); |
| 2819 | n_left_from = frame->n_vectors; |
| 2820 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2821 | |
| 2822 | b = bufs; |
| 2823 | next = nexts; |
| 2824 | |
| 2825 | while (n_left_from >= 4) |
| 2826 | { |
| 2827 | u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER; |
| 2828 | tcp_connection_t *tc0, *tc1; |
| 2829 | |
| 2830 | { |
| 2831 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2832 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2833 | |
| 2834 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2835 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2836 | } |
| 2837 | |
| 2838 | next[0] = next[1] = TCP_INPUT_NEXT_DROP; |
| 2839 | |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2840 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4, |
| 2841 | is_nolookup); |
| 2842 | tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4, |
| 2843 | is_nolookup); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2844 | |
| 2845 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 2846 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2847 | ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); |
| 2848 | ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1]))); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2849 | |
| 2850 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 2851 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 2852 | |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2853 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], err_counters); |
| 2854 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], err_counters); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2855 | } |
| 2856 | else |
| 2857 | { |
| 2858 | if (PREDICT_TRUE (tc0 != 0)) |
| 2859 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2860 | ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2861 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2862 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], |
| 2863 | err_counters); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2864 | } |
| 2865 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2866 | { |
| 2867 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
Filip Tehlar | 5035bf0 | 2023-02-20 13:46:32 +0100 | [diff] [blame] | 2868 | tcp_inc_err_counter (err_counters, error0, 1); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2869 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2870 | |
| 2871 | if (PREDICT_TRUE (tc1 != 0)) |
| 2872 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2873 | ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1]))); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2874 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2875 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], |
| 2876 | err_counters); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2877 | } |
| 2878 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2879 | { |
| 2880 | tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); |
Filip Tehlar | 5035bf0 | 2023-02-20 13:46:32 +0100 | [diff] [blame] | 2881 | tcp_inc_err_counter (err_counters, error1, 1); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2882 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2883 | } |
| 2884 | |
| 2885 | b += 2; |
| 2886 | next += 2; |
| 2887 | n_left_from -= 2; |
| 2888 | } |
| 2889 | while (n_left_from > 0) |
| 2890 | { |
| 2891 | tcp_connection_t *tc0; |
| 2892 | u32 error0 = TCP_ERROR_NO_LISTENER; |
| 2893 | |
| 2894 | if (n_left_from > 1) |
| 2895 | { |
| 2896 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2897 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2898 | } |
| 2899 | |
| 2900 | next[0] = TCP_INPUT_NEXT_DROP; |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2901 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4, |
| 2902 | is_nolookup); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2903 | if (PREDICT_TRUE (tc0 != 0)) |
| 2904 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2905 | ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2906 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
Florin Coras | 045a6ae | 2023-02-28 12:43:39 -0800 | [diff] [blame] | 2907 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], err_counters); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2908 | } |
| 2909 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2910 | { |
| 2911 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
Filip Tehlar | 5035bf0 | 2023-02-20 13:46:32 +0100 | [diff] [blame] | 2912 | tcp_inc_err_counter (err_counters, error0, 1); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2913 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2914 | |
| 2915 | b += 1; |
| 2916 | next += 1; |
| 2917 | n_left_from -= 1; |
| 2918 | } |
| 2919 | |
| 2920 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
Filip Tehlar | bc4dc16 | 2023-04-17 12:22:12 +0200 | [diff] [blame] | 2921 | tcp_input_trace_frame (vm, node, bufs, nexts, frame->n_vectors, is_ip4); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2922 | |
Filip Tehlar | 5035bf0 | 2023-02-20 13:46:32 +0100 | [diff] [blame] | 2923 | tcp_store_err_counters (input, err_counters); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2924 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 2925 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2926 | } |
| 2927 | |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2928 | VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm, |
| 2929 | vlib_node_runtime_t * node, |
| 2930 | vlib_frame_t * from_frame) |
| 2931 | { |
| 2932 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ , |
| 2933 | 1 /* is_nolookup */ ); |
| 2934 | } |
| 2935 | |
| 2936 | VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm, |
| 2937 | vlib_node_runtime_t * node, |
| 2938 | vlib_frame_t * from_frame) |
| 2939 | { |
| 2940 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ , |
| 2941 | 1 /* is_nolookup */ ); |
| 2942 | } |
| 2943 | |
| 2944 | /* *INDENT-OFF* */ |
| 2945 | VLIB_REGISTER_NODE (tcp4_input_nolookup_node) = |
| 2946 | { |
| 2947 | .name = "tcp4-input-nolookup", |
| 2948 | /* Takes a vector of packets. */ |
| 2949 | .vector_size = sizeof (u32), |
| 2950 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2951 | .error_counters = tcp_input_error_counters, |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2952 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 2953 | .next_nodes = |
| 2954 | { |
| 2955 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 2956 | foreach_tcp4_input_next |
| 2957 | #undef _ |
| 2958 | }, |
| 2959 | .format_buffer = format_tcp_header, |
| 2960 | .format_trace = format_tcp_rx_trace, |
| 2961 | }; |
| 2962 | /* *INDENT-ON* */ |
| 2963 | |
| 2964 | /* *INDENT-OFF* */ |
| 2965 | VLIB_REGISTER_NODE (tcp6_input_nolookup_node) = |
| 2966 | { |
| 2967 | .name = "tcp6-input-nolookup", |
| 2968 | /* Takes a vector of packets. */ |
| 2969 | .vector_size = sizeof (u32), |
| 2970 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 2971 | .error_counters = tcp_input_error_counters, |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2972 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 2973 | .next_nodes = |
| 2974 | { |
| 2975 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 2976 | foreach_tcp6_input_next |
| 2977 | #undef _ |
| 2978 | }, |
| 2979 | .format_buffer = format_tcp_header, |
| 2980 | .format_trace = format_tcp_rx_trace, |
| 2981 | }; |
| 2982 | /* *INDENT-ON* */ |
| 2983 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2984 | VLIB_NODE_FN (tcp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2985 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2986 | { |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2987 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ , |
| 2988 | 0 /* is_nolookup */ ); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2989 | } |
| 2990 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2991 | VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2992 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2993 | { |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2994 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ , |
| 2995 | 0 /* is_nolookup */ ); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2996 | } |
| 2997 | |
| 2998 | /* *INDENT-OFF* */ |
| 2999 | VLIB_REGISTER_NODE (tcp4_input_node) = |
| 3000 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3001 | .name = "tcp4-input", |
| 3002 | /* Takes a vector of packets. */ |
| 3003 | .vector_size = sizeof (u32), |
| 3004 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 3005 | .error_counters = tcp_input_error_counters, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3006 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3007 | .next_nodes = |
| 3008 | { |
| 3009 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3010 | foreach_tcp4_input_next |
| 3011 | #undef _ |
| 3012 | }, |
| 3013 | .format_buffer = format_tcp_header, |
| 3014 | .format_trace = format_tcp_rx_trace, |
| 3015 | }; |
| 3016 | /* *INDENT-ON* */ |
| 3017 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3018 | /* *INDENT-OFF* */ |
| 3019 | VLIB_REGISTER_NODE (tcp6_input_node) = |
| 3020 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3021 | .name = "tcp6-input", |
| 3022 | /* Takes a vector of packets. */ |
| 3023 | .vector_size = sizeof (u32), |
| 3024 | .n_errors = TCP_N_ERROR, |
Filip Tehlar | 0c4931c | 2021-10-06 09:47:41 +0000 | [diff] [blame] | 3025 | .error_counters = tcp_input_error_counters, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3026 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3027 | .next_nodes = |
| 3028 | { |
| 3029 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3030 | foreach_tcp6_input_next |
| 3031 | #undef _ |
| 3032 | }, |
| 3033 | .format_buffer = format_tcp_header, |
| 3034 | .format_trace = format_tcp_rx_trace, |
| 3035 | }; |
| 3036 | /* *INDENT-ON* */ |
| 3037 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 3038 | #ifndef CLIB_MARCH_VARIANT |
Florin Coras | 04ae827 | 2021-04-12 19:55:37 -0700 | [diff] [blame] | 3039 | void |
| 3040 | tcp_check_gso (tcp_connection_t *tc) |
| 3041 | { |
| 3042 | tcp_check_tx_offload (tc, tc->c_is_ip4); |
| 3043 | } |
| 3044 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3045 | static void |
| 3046 | tcp_dispatch_table_init (tcp_main_t * tm) |
| 3047 | { |
| 3048 | int i, j; |
| 3049 | for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++) |
| 3050 | for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++) |
| 3051 | { |
| 3052 | tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP; |
| 3053 | tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH; |
| 3054 | } |
| 3055 | |
| 3056 | #define _(t,f,n,e) \ |
| 3057 | do { \ |
| 3058 | tm->dispatch_table[TCP_STATE_##t][f].next = (n); \ |
| 3059 | tm->dispatch_table[TCP_STATE_##t][f].error = (e); \ |
| 3060 | } while (0) |
| 3061 | |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3062 | /* RFC 793: In LISTEN if RST drop and if ACK return RST */ |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 3063 | _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3064 | _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID); |
| 3065 | _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3066 | _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3067 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
| 3068 | TCP_ERROR_ACK_INVALID); |
| 3069 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3070 | TCP_ERROR_SEGMENT_INVALID); |
| 3071 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3072 | TCP_ERROR_SEGMENT_INVALID); |
| 3073 | _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3074 | TCP_ERROR_INVALID_CONNECTION); |
| 3075 | _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3076 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3077 | TCP_ERROR_SEGMENT_INVALID); |
| 3078 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3079 | TCP_ERROR_SEGMENT_INVALID); |
| 3080 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 3081 | TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3082 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP, |
| 3083 | TCP_ERROR_SEGMENT_INVALID); |
| 3084 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3085 | TCP_ERROR_SEGMENT_INVALID); |
| 3086 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3087 | TCP_ERROR_SEGMENT_INVALID); |
| 3088 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3089 | TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3090 | /* ACK for for a SYN-ACK -> tcp-rcv-process. */ |
| 3091 | _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 3092 | _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | e8460c7 | 2018-09-24 14:40:40 -0700 | [diff] [blame] | 3093 | _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3094 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3095 | _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3096 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3097 | TCP_ERROR_NONE); |
| 3098 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3099 | TCP_ERROR_NONE); |
| 3100 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3101 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3102 | _(SYN_RCVD, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | c01c445 | 2018-09-20 18:36:54 -0700 | [diff] [blame] | 3103 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3104 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3105 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3106 | TCP_ERROR_NONE); |
| 3107 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3108 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3109 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3110 | TCP_ERROR_NONE); |
| 3111 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3112 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3113 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3114 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3115 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3116 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3117 | _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3118 | /* SYN-ACK for a SYN */ |
| 3119 | _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3120 | TCP_ERROR_NONE); |
| 3121 | _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3122 | _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3123 | _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3124 | TCP_ERROR_NONE); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 3125 | _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3126 | _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3127 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3128 | /* ACK for for established connection -> tcp-established. */ |
| 3129 | _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3130 | /* FIN for for established connection -> tcp-established. */ |
| 3131 | _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3132 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3133 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3134 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, |
| 3135 | TCP_ERROR_NONE); |
| 3136 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3137 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3138 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, |
| 3139 | TCP_ERROR_NONE); |
| 3140 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3141 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3142 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3143 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3144 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3145 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 3146 | _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3147 | _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3148 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3149 | _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3150 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3151 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3152 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, |
| 3153 | TCP_ERROR_NONE); |
| 3154 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3155 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3156 | _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3157 | /* ACK or FIN-ACK to our FIN */ |
| 3158 | _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3159 | _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3160 | TCP_ERROR_NONE); |
| 3161 | /* FIN in reply to our FIN from the other side */ |
Florin Coras | 76bc130 | 2018-12-23 23:36:36 -0800 | [diff] [blame] | 3162 | _(FIN_WAIT_1, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3163 | _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 76bc130 | 2018-12-23 23:36:36 -0800 | [diff] [blame] | 3164 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3165 | TCP_ERROR_NONE); |
| 3166 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3167 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3168 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3169 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3170 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3171 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3172 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3173 | TCP_ERROR_NONE); |
| 3174 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3175 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 3176 | _(FIN_WAIT_1, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 76bc130 | 2018-12-23 23:36:36 -0800 | [diff] [blame] | 3177 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3178 | TCP_ERROR_NONE); |
| 3179 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3180 | TCP_ERROR_NONE); |
| 3181 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3182 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3183 | _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | e96bf63 | 2018-12-18 22:44:27 -0800 | [diff] [blame] | 3184 | _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3185 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3186 | _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 5631893 | 2018-05-23 20:44:12 -0700 | [diff] [blame] | 3187 | _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 3188 | _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3189 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3190 | TCP_ERROR_NONE); |
| 3191 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3192 | TCP_ERROR_NONE); |
| 3193 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3194 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 3195 | _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3196 | _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3197 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3198 | _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 3199 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3200 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3201 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3202 | TCP_ERROR_NONE); |
| 3203 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3204 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3205 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3206 | TCP_ERROR_NONE); |
| 3207 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3208 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 79c04d6 | 2019-08-11 19:49:05 -0700 | [diff] [blame] | 3209 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3210 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3211 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3212 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3213 | /* FIN confirming that the peer (app) has closed */ |
| 3214 | _(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 3215 | _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3216 | _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3217 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3218 | _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3219 | _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3220 | TCP_ERROR_NONE); |
Florin Coras | f9512bf | 2020-07-29 10:13:07 -0700 | [diff] [blame] | 3221 | _(FIN_WAIT_2, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 61d63e8 | 2023-10-14 15:22:04 -0700 | [diff] [blame] | 3222 | _ (FIN_WAIT_2, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3223 | TCP_ERROR_NONE); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3224 | _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3225 | _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3226 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3227 | _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3228 | _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3229 | TCP_ERROR_NONE); |
Florin Coras | d75213f | 2020-07-28 10:57:09 -0700 | [diff] [blame] | 3230 | _(CLOSE_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | d12ff50 | 2018-12-25 10:55:01 -0800 | [diff] [blame] | 3231 | _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3232 | _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3233 | _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3234 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3235 | TCP_ERROR_NONE); |
Florin Coras | d12ff50 | 2018-12-25 10:55:01 -0800 | [diff] [blame] | 3236 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3237 | TCP_ERROR_NONE); |
| 3238 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3239 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3240 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3241 | TCP_ERROR_NONE); |
| 3242 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3243 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3244 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3245 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3246 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3247 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3248 | _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3249 | _(LAST_ACK, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3250 | TCP_ERROR_NONE); |
Florin Coras | c01d578 | 2018-10-17 14:53:11 -0700 | [diff] [blame] | 3251 | _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | d12ff50 | 2018-12-25 10:55:01 -0800 | [diff] [blame] | 3252 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3253 | TCP_ERROR_NONE); |
| 3254 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3255 | TCP_ERROR_NONE); |
| 3256 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3257 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 3258 | _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3259 | _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3260 | _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3261 | TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3262 | _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3263 | _(TIME_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3264 | TCP_ERROR_NONE); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 3265 | _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3266 | /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An |
| 3267 | * incoming segment not containing a RST causes a RST to be sent in |
| 3268 | * response.*/ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3269 | _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3270 | _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3271 | TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 3272 | _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 3ffc77d | 2023-02-16 18:59:38 -0800 | [diff] [blame] | 3273 | _ (CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3274 | _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 3275 | TCP_ERROR_CONNECTION_CLOSED); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3276 | #undef _ |
| 3277 | } |
| 3278 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 3279 | static clib_error_t * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3280 | tcp_input_init (vlib_main_t * vm) |
| 3281 | { |
| 3282 | clib_error_t *error = 0; |
| 3283 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3284 | |
| 3285 | if ((error = vlib_call_init_function (vm, tcp_init))) |
| 3286 | return error; |
| 3287 | |
| 3288 | /* Initialize dispatch table. */ |
| 3289 | tcp_dispatch_table_init (tm); |
| 3290 | |
| 3291 | return error; |
| 3292 | } |
| 3293 | |
| 3294 | VLIB_INIT_FUNCTION (tcp_input_init); |
| 3295 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 3296 | #endif /* CLIB_MARCH_VARIANT */ |
| 3297 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3298 | /* |
| 3299 | * fd.io coding-style-patch-verification: ON |
| 3300 | * |
| 3301 | * Local Variables: |
| 3302 | * eval: (c-set-style "gnu") |
| 3303 | * End: |
| 3304 | */ |