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 | |
| 24 | static char *tcp_error_strings[] = { |
| 25 | #define tcp_error(n,s) s, |
| 26 | #include <vnet/tcp/tcp_error.def> |
| 27 | #undef tcp_error |
| 28 | }; |
| 29 | |
| 30 | /* All TCP nodes have the same outgoing arcs */ |
| 31 | #define foreach_tcp_state_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 32 | _ (DROP4, "ip4-drop") \ |
| 33 | _ (DROP6, "ip6-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 34 | _ (TCP4_OUTPUT, "tcp4-output") \ |
| 35 | _ (TCP6_OUTPUT, "tcp6-output") |
| 36 | |
| 37 | typedef enum _tcp_established_next |
| 38 | { |
| 39 | #define _(s,n) TCP_ESTABLISHED_NEXT_##s, |
| 40 | foreach_tcp_state_next |
| 41 | #undef _ |
| 42 | TCP_ESTABLISHED_N_NEXT, |
| 43 | } tcp_established_next_t; |
| 44 | |
| 45 | typedef enum _tcp_rcv_process_next |
| 46 | { |
| 47 | #define _(s,n) TCP_RCV_PROCESS_NEXT_##s, |
| 48 | foreach_tcp_state_next |
| 49 | #undef _ |
| 50 | TCP_RCV_PROCESS_N_NEXT, |
| 51 | } tcp_rcv_process_next_t; |
| 52 | |
| 53 | typedef enum _tcp_syn_sent_next |
| 54 | { |
| 55 | #define _(s,n) TCP_SYN_SENT_NEXT_##s, |
| 56 | foreach_tcp_state_next |
| 57 | #undef _ |
| 58 | TCP_SYN_SENT_N_NEXT, |
| 59 | } tcp_syn_sent_next_t; |
| 60 | |
| 61 | typedef enum _tcp_listen_next |
| 62 | { |
| 63 | #define _(s,n) TCP_LISTEN_NEXT_##s, |
| 64 | foreach_tcp_state_next |
| 65 | #undef _ |
| 66 | TCP_LISTEN_N_NEXT, |
| 67 | } tcp_listen_next_t; |
| 68 | |
| 69 | /* Generic, state independent indices */ |
| 70 | typedef enum _tcp_state_next |
| 71 | { |
| 72 | #define _(s,n) TCP_NEXT_##s, |
| 73 | foreach_tcp_state_next |
| 74 | #undef _ |
| 75 | TCP_STATE_N_NEXT, |
| 76 | } tcp_state_next_t; |
| 77 | |
| 78 | #define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \ |
| 79 | : TCP_NEXT_TCP6_OUTPUT) |
| 80 | |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 81 | #define tcp_next_drop(is_ip4) (is_ip4 ? TCP_NEXT_DROP4 \ |
| 82 | : TCP_NEXT_DROP6) |
| 83 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 84 | /** |
| 85 | * Validate segment sequence number. As per RFC793: |
| 86 | * |
| 87 | * Segment Receive Test |
| 88 | * Length Window |
| 89 | * ------- ------- ------------------------------------------- |
| 90 | * 0 0 SEG.SEQ = RCV.NXT |
| 91 | * 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 92 | * >0 0 not acceptable |
| 93 | * >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 94 | * or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND |
| 95 | * |
| 96 | * This ultimately consists in checking if segment falls within the window. |
| 97 | * The one important difference compared to RFC793 is that we use rcv_las, |
| 98 | * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the |
| 99 | * peer's reference when computing our receive window. |
| 100 | * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 101 | * This: |
| 102 | * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) |
| 103 | * however, is too strict when we have retransmits. Instead we just check that |
| 104 | * the seq is not beyond the right edge and that the end of the segment is not |
| 105 | * less than the left edge. |
| 106 | * |
| 107 | * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so |
| 108 | * use rcv_nxt in the right edge window test instead of rcv_las. |
| 109 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 110 | */ |
| 111 | always_inline u8 |
| 112 | tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) |
| 113 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 114 | return (seq_geq (end_seq, tc->rcv_las) |
| 115 | && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 116 | } |
| 117 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 118 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 119 | * RFC1323: Check against wrapped sequence numbers (PAWS). If we have |
| 120 | * timestamp to echo and it's less than tsval_recent, drop segment |
| 121 | * but still send an ACK in order to retain TCP's mechanism for detecting |
| 122 | * and recovering from half-open connections |
| 123 | * |
| 124 | * Or at least that's what the theory says. It seems that this might not work |
| 125 | * very well with packet reordering and fast retransmit. XXX |
| 126 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 127 | always_inline int |
| 128 | tcp_segment_check_paws (tcp_connection_t * tc) |
| 129 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 130 | return tcp_opts_tstamp (&tc->rcv_opts) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 131 | && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 135 | * Update tsval recent |
| 136 | */ |
| 137 | always_inline void |
| 138 | tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) |
| 139 | { |
| 140 | /* |
| 141 | * RFC1323: If Last.ACK.sent falls within the range of sequence numbers |
| 142 | * of an incoming segment: |
| 143 | * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN |
| 144 | * then the TSval from the segment is copied to TS.Recent; |
| 145 | * otherwise, the TSval is ignored. |
| 146 | */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 147 | if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) |
| 148 | && seq_leq (tc->rcv_las, seq_end)) |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 149 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 150 | ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 151 | tc->tsval_recent = tc->rcv_opts.tsval; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 152 | tc->tsval_recent_age = tcp_time_now_w_thread (tc->c_thread_index); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 153 | } |
| 154 | } |
| 155 | |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 156 | static void |
| 157 | tcp_handle_rst (tcp_connection_t * tc) |
| 158 | { |
| 159 | switch (tc->rst_state) |
| 160 | { |
| 161 | case TCP_STATE_SYN_RCVD: |
| 162 | /* Cleanup everything. App wasn't notified yet */ |
| 163 | session_transport_delete_notify (&tc->connection); |
| 164 | tcp_connection_cleanup (tc); |
| 165 | break; |
| 166 | case TCP_STATE_SYN_SENT: |
Florin Coras | 67fe778 | 2020-09-02 10:51:10 -0700 | [diff] [blame] | 167 | session_stream_connect_notify (&tc->connection, SESSION_E_REFUSED); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 168 | tcp_connection_cleanup (tc); |
| 169 | break; |
| 170 | case TCP_STATE_ESTABLISHED: |
| 171 | session_transport_reset_notify (&tc->connection); |
| 172 | session_transport_closed_notify (&tc->connection); |
| 173 | break; |
| 174 | case TCP_STATE_CLOSE_WAIT: |
| 175 | case TCP_STATE_FIN_WAIT_1: |
| 176 | case TCP_STATE_FIN_WAIT_2: |
| 177 | case TCP_STATE_CLOSING: |
| 178 | case TCP_STATE_LAST_ACK: |
| 179 | session_transport_closed_notify (&tc->connection); |
| 180 | break; |
| 181 | case TCP_STATE_CLOSED: |
| 182 | case TCP_STATE_TIME_WAIT: |
| 183 | break; |
| 184 | default: |
| 185 | TCP_DBG ("reset state: %u", tc->state); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 191 | { |
| 192 | if (!tcp_disconnect_pending (tc)) |
| 193 | { |
| 194 | tc->rst_state = tc->state; |
| 195 | vec_add1 (wrk->pending_resets, tc->c_c_index); |
| 196 | tcp_disconnect_pending_on (tc); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Handle reset packet |
| 202 | * |
| 203 | * Programs disconnect/reset notification that should be sent |
| 204 | * later by calling @ref tcp_handle_disconnects |
| 205 | */ |
| 206 | static void |
| 207 | tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 208 | { |
| 209 | TCP_EVT (TCP_EVT_RST_RCVD, tc); |
| 210 | switch (tc->state) |
| 211 | { |
| 212 | case TCP_STATE_SYN_RCVD: |
| 213 | tcp_program_reset_ntf (wrk, tc); |
| 214 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 215 | break; |
| 216 | case TCP_STATE_SYN_SENT: |
Florin Coras | 96acc9b | 2020-02-18 22:51:26 +0000 | [diff] [blame] | 217 | /* Do not program ntf because the connection is half-open */ |
Ivan Shvedunov | e52eafd | 2020-07-29 19:15:41 +0300 | [diff] [blame] | 218 | tc->rst_state = tc->state; |
Florin Coras | 96acc9b | 2020-02-18 22:51:26 +0000 | [diff] [blame] | 219 | tcp_handle_rst (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 220 | break; |
| 221 | case TCP_STATE_ESTABLISHED: |
| 222 | tcp_connection_timers_reset (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 223 | tcp_cong_recovery_off (tc); |
| 224 | tcp_program_reset_ntf (wrk, tc); |
| 225 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 226 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 227 | break; |
| 228 | case TCP_STATE_CLOSE_WAIT: |
| 229 | case TCP_STATE_FIN_WAIT_1: |
| 230 | case TCP_STATE_FIN_WAIT_2: |
| 231 | case TCP_STATE_CLOSING: |
| 232 | case TCP_STATE_LAST_ACK: |
| 233 | tcp_connection_timers_reset (tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 234 | tcp_cong_recovery_off (tc); |
| 235 | tcp_program_reset_ntf (wrk, tc); |
| 236 | /* Make sure we mark the session as closed. In some states we may |
| 237 | * be still trying to send data */ |
| 238 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 239 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 240 | break; |
| 241 | case TCP_STATE_CLOSED: |
| 242 | case TCP_STATE_TIME_WAIT: |
| 243 | break; |
| 244 | default: |
| 245 | TCP_DBG ("reset state: %u", tc->state); |
| 246 | } |
| 247 | } |
| 248 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 249 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 250 | * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 |
| 251 | * |
| 252 | * It first verifies if segment has a wrapped sequence number (PAWS) and then |
| 253 | * does the processing associated to the first four steps (ignoring security |
| 254 | * and precedence): sequence number, rst bit and syn bit checks. |
| 255 | * |
| 256 | * @return 0 if segments passes validation. |
| 257 | */ |
| 258 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 259 | tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, |
| 260 | vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 261 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 262 | /* We could get a burst of RSTs interleaved with acks */ |
| 263 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 264 | { |
| 265 | tcp_send_reset (tc0); |
| 266 | *error0 = TCP_ERROR_CONNECTION_CLOSED; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 267 | goto error; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 268 | } |
| 269 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 270 | if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 271 | { |
| 272 | *error0 = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 273 | goto error; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 274 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 275 | |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 276 | if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0))) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 277 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 278 | *error0 = TCP_ERROR_OPTIONS; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 279 | goto error; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 280 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 281 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 282 | if (PREDICT_FALSE (tcp_segment_check_paws (tc0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 283 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 284 | *error0 = TCP_ERROR_PAWS; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 285 | TCP_EVT (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, |
| 286 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 287 | |
| 288 | /* If it just so happens that a segment updates tsval_recent for a |
| 289 | * segment over 24 days old, invalidate tsval_recent. */ |
| 290 | if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 291 | tcp_time_now_w_thread (tc0->c_thread_index))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 292 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 293 | tc0->tsval_recent = tc0->rcv_opts.tsval; |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 294 | clib_warning ("paws failed: 24-day old segment"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 295 | } |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 296 | /* Drop after ack if not rst. Resets can fail paws check as per |
| 297 | * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT |
| 298 | * be subjected to the PAWS check by verifying an acceptable value in |
| 299 | * SEG.TSval */ |
| 300 | else if (!tcp_rst (th0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 301 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 302 | tcp_program_ack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 303 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 304 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | |
| 308 | /* 1st: check sequence number */ |
| 309 | if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 310 | vnet_buffer (b0)->tcp.seq_end)) |
| 311 | { |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 312 | /* SYN/SYN-ACK retransmit */ |
| 313 | if (tcp_syn (th0) |
| 314 | && vnet_buffer (b0)->tcp.seq_number == tc0->rcv_nxt - 1) |
| 315 | { |
| 316 | tcp_options_parse (th0, &tc0->rcv_opts, 1); |
| 317 | if (tc0->state == TCP_STATE_SYN_RCVD) |
| 318 | { |
| 319 | tcp_send_synack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 320 | TCP_EVT (TCP_EVT_SYN_RCVD, tc0, 0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 321 | *error0 = TCP_ERROR_SYNS_RCVD; |
| 322 | } |
| 323 | else |
| 324 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 325 | tcp_program_ack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 326 | TCP_EVT (TCP_EVT_SYNACK_RCVD, tc0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 327 | *error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 328 | } |
| 329 | goto error; |
| 330 | } |
| 331 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 332 | /* 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] | 333 | * through for ack processing. It should be dropped later. */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 334 | if (tc0->rcv_wnd < tc0->snd_mss |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 335 | && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number) |
| 336 | goto check_reset; |
| 337 | |
| 338 | /* If we entered recovery and peer did so as well, there's a chance that |
| 339 | * dup acks won't be acceptable on either end because seq_end may be less |
| 340 | * than rcv_las. This can happen if acks are lost in both directions. */ |
| 341 | if (tcp_in_recovery (tc0) |
| 342 | && seq_geq (vnet_buffer (b0)->tcp.seq_number, |
| 343 | tc0->rcv_las - tc0->rcv_wnd) |
| 344 | && seq_leq (vnet_buffer (b0)->tcp.seq_end, |
| 345 | tc0->rcv_nxt + tc0->rcv_wnd)) |
| 346 | goto check_reset; |
| 347 | |
| 348 | *error0 = TCP_ERROR_RCV_WND; |
| 349 | |
Florin Coras | a495a3e | 2019-08-29 18:33:24 -0700 | [diff] [blame] | 350 | /* If we advertised a zero rcv_wnd and the segment is in the past or the |
| 351 | * next one that we expect, it is probably a window probe */ |
| 352 | if ((tc0->flags & TCP_CONN_ZERO_RWND_SENT) |
| 353 | && seq_lt (vnet_buffer (b0)->tcp.seq_end, |
| 354 | tc0->rcv_las + tc0->rcv_opts.mss)) |
| 355 | *error0 = TCP_ERROR_ZERO_RWND; |
| 356 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 357 | tc0->errors.below_data_wnd += seq_lt (vnet_buffer (b0)->tcp.seq_end, |
| 358 | tc0->rcv_las); |
| 359 | |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 360 | /* If not RST, send dup ack */ |
| 361 | if (!tcp_rst (th0)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 362 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 363 | tcp_program_dupack (tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 364 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 365 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 366 | goto error; |
| 367 | |
| 368 | check_reset: |
| 369 | ; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | /* 2nd: check the RST bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 373 | if (PREDICT_FALSE (tcp_rst (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 374 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 375 | tcp_rcv_rst (wrk, tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 376 | *error0 = TCP_ERROR_RST_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 377 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | /* 3rd: check security and precedence (skip) */ |
| 381 | |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 382 | /* 4th: check the SYN bit (in window) */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 383 | if (PREDICT_FALSE (tcp_syn (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 384 | { |
Florin Coras | d567a8d | 2019-06-07 12:38:55 -0700 | [diff] [blame] | 385 | /* As per RFC5961 send challenge ack instead of reset */ |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 386 | tcp_program_ack (tc0); |
Florin Coras | 830fe73 | 2019-02-15 18:20:58 -0800 | [diff] [blame] | 387 | *error0 = TCP_ERROR_SPURIOUS_SYN; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 388 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 389 | } |
| 390 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 391 | /* If segment in window, save timestamp */ |
| 392 | tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 393 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 394 | return 0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 395 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 396 | error: |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 397 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | always_inline int |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 401 | 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] | 402 | { |
| 403 | /* SND.UNA =< SEG.ACK =< SND.NXT */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 404 | if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number) |
| 405 | && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt))) |
| 406 | { |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 407 | if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt) |
Florin Coras | 282a3cb | 2019-04-02 21:43:38 -0700 | [diff] [blame] | 408 | && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 409 | { |
| 410 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
| 411 | goto acceptable; |
| 412 | } |
| 413 | *error = TCP_ERROR_ACK_INVALID; |
| 414 | return -1; |
| 415 | } |
| 416 | |
| 417 | acceptable: |
| 418 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
| 419 | tc->snd_una = vnet_buffer (b)->tcp.ack_number; |
| 420 | *error = TCP_ERROR_ACK_OK; |
| 421 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298 |
| 426 | * |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 427 | * Note that although in the original article srtt and rttvar are scaled |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 428 | * to minimize round-off errors, here we don't. Instead, we rely on |
| 429 | * better precision time measurements. |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 430 | * |
| 431 | * A known limitation of the algorithm is that a drop in rtt results in a |
| 432 | * rttvar increase and bigger RTO. |
| 433 | * |
| 434 | * mrtt must be provided in @ref TCP_TICK multiples, i.e., in us. Note that |
| 435 | * timestamps are measured as ms ticks so they must be converted before |
| 436 | * calling this function. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 437 | */ |
| 438 | static void |
| 439 | tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) |
| 440 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 441 | int err, diff; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 442 | |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 443 | err = mrtt - tc->srtt; |
| 444 | tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); |
| 445 | diff = (clib_abs (err) - (int) tc->rttvar) >> 2; |
| 446 | tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 447 | } |
| 448 | |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 449 | static inline void |
| 450 | tcp_estimate_rtt_us (tcp_connection_t * tc, f64 mrtt) |
| 451 | { |
| 452 | tc->mrtt_us = tc->mrtt_us + (mrtt - tc->mrtt_us) * 0.125; |
| 453 | } |
| 454 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 455 | /** |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 456 | * Update rtt estimate |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 457 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 458 | * We have potentially three sources of rtt measurements: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 459 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 460 | * TSOPT difference between current and echoed timestamp. It has ms |
| 461 | * precision and can be computed per ack |
| 462 | * ACK timing one sequence number is tracked per rtt with us (micro second) |
| 463 | * precision. |
| 464 | * rate sample if enabled, all outstanding bytes are tracked with us |
| 465 | * precision. Every ack and sack are a rtt sample |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 466 | * |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 467 | * Middle boxes are known to fiddle with TCP options so we give higher |
| 468 | * priority to ACK timing. |
| 469 | * |
| 470 | * For now, rate sample rtts are only used under congestion. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 471 | */ |
| 472 | static int |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 473 | 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] | 474 | { |
| 475 | u32 mrtt = 0; |
| 476 | |
| 477 | /* Karn's rule, part 1. Don't use retransmitted segments to estimate |
| 478 | * RTT because they're ambiguous. */ |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 479 | if (tcp_in_cong_recovery (tc)) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 480 | { |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 481 | /* Accept rtt estimates for samples that have not been retransmitted */ |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 482 | if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 483 | || (rs->flags & TCP_BTS_IS_RXT)) |
| 484 | goto done; |
| 485 | if (rs->rtt_time) |
| 486 | tcp_estimate_rtt_us (tc, rs->rtt_time); |
| 487 | mrtt = rs->rtt_time * THZ; |
| 488 | goto estimate_rtt; |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 489 | } |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 490 | |
| 491 | if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 492 | { |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 493 | 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] | 494 | tcp_estimate_rtt_us (tc, sample); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 495 | mrtt = clib_max ((u32) (sample * THZ), 1); |
| 496 | /* Allow measuring of a new RTT */ |
| 497 | tc->rtt_ts = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 498 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 499 | /* As per RFC7323 TSecr can be used for RTTM only if the segment advances |
| 500 | * snd_una, i.e., the left side of the send window: |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 501 | * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ |
| 502 | else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 503 | { |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 504 | mrtt = clib_max (tcp_tstamp (tc) - tc->rcv_opts.tsecr, 1); |
| 505 | mrtt *= TCP_TSTP_TO_HZ; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 506 | } |
| 507 | |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 508 | estimate_rtt: |
| 509 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 510 | /* Ignore dubious measurements */ |
| 511 | if (mrtt == 0 || mrtt > TCP_RTT_MAX) |
| 512 | goto done; |
| 513 | |
| 514 | tcp_estimate_rtt (tc, mrtt); |
| 515 | |
| 516 | done: |
| 517 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 518 | /* 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] | 519 | * even if mrtt is not valid since we update the rto lower */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 520 | tc->rto_boff = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 521 | tcp_update_rto (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 522 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 523 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 524 | } |
| 525 | |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 526 | static void |
| 527 | tcp_estimate_initial_rtt (tcp_connection_t * tc) |
| 528 | { |
| 529 | u8 thread_index = vlib_num_workers ()? 1 : 0; |
| 530 | int mrtt; |
| 531 | |
| 532 | if (tc->rtt_ts) |
| 533 | { |
| 534 | tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 535 | tc->mrtt_us = clib_max (tc->mrtt_us, 0.0001); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 536 | mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1); |
| 537 | tc->rtt_ts = 0; |
| 538 | } |
| 539 | else |
| 540 | { |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 541 | mrtt = tcp_tstamp (tc) - tc->rcv_opts.tsecr; |
| 542 | mrtt = clib_max (mrtt, 1) * TCP_TSTP_TO_HZ; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 543 | /* Due to retransmits we don't know the initial mrtt */ |
| 544 | if (tc->rto_boff && mrtt > 1 * THZ) |
| 545 | mrtt = 1 * THZ; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 546 | tc->mrtt_us = (f64) mrtt *TCP_TICK; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | if (mrtt > 0 && mrtt < TCP_RTT_MAX) |
Florin Coras | eedc74b | 2020-07-31 12:32:40 -0700 | [diff] [blame] | 550 | { |
| 551 | /* First measurement as per RFC 6298 */ |
| 552 | tc->srtt = mrtt; |
| 553 | tc->rttvar = mrtt >> 1; |
| 554 | } |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 555 | tcp_update_rto (tc); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 556 | } |
| 557 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | /** |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 559 | * Dequeue bytes for connections that have received acks in last burst |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 560 | */ |
| 561 | static void |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 562 | tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 563 | { |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 564 | u32 thread_index = wrk->vm->thread_index; |
| 565 | u32 *pending_deq_acked; |
| 566 | tcp_connection_t *tc; |
| 567 | int i; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 568 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 569 | if (!vec_len (wrk->pending_deq_acked)) |
| 570 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 571 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 572 | pending_deq_acked = wrk->pending_deq_acked; |
| 573 | for (i = 0; i < vec_len (pending_deq_acked); i++) |
| 574 | { |
| 575 | tc = tcp_connection_get (pending_deq_acked[i], thread_index); |
| 576 | tc->flags &= ~TCP_CONN_DEQ_PENDING; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 577 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 578 | if (PREDICT_FALSE (!tc->burst_acked)) |
| 579 | continue; |
| 580 | |
| 581 | /* Dequeue the newly ACKed bytes */ |
| 582 | session_tx_fifo_dequeue_drop (&tc->connection, tc->burst_acked); |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 583 | tcp_validate_txf_size (tc, tc->snd_nxt - tc->snd_una); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 584 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 585 | if (tcp_is_descheduled (tc)) |
| 586 | tcp_reschedule (tc); |
| 587 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 588 | /* If everything has been acked, stop retransmit timer |
| 589 | * otherwise update. */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 590 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 591 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 592 | /* Update pacer based on our new cwnd estimate */ |
| 593 | tcp_connection_tx_pacer_update (tc); |
| 594 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 595 | tc->burst_acked = 0; |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 596 | } |
| 597 | _vec_len (wrk->pending_deq_acked) = 0; |
| 598 | } |
| 599 | |
| 600 | static void |
| 601 | tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 602 | { |
| 603 | if (!(tc->flags & TCP_CONN_DEQ_PENDING)) |
| 604 | { |
| 605 | vec_add1 (wrk->pending_deq_acked, tc->c_c_index); |
| 606 | tc->flags |= TCP_CONN_DEQ_PENDING; |
| 607 | } |
Florin Coras | 558e3e0 | 2019-09-06 12:56:58 -0700 | [diff] [blame] | 608 | tc->burst_acked += tc->bytes_acked; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 609 | } |
| 610 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 611 | /** |
| 612 | * Try to update snd_wnd based on feedback received from peer. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 613 | * |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 614 | * If successful, and new window is 'effectively' 0, activate persist |
| 615 | * timer. |
| 616 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 617 | static void |
| 618 | tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) |
| 619 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 620 | /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set |
| 621 | * 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] | 622 | if (seq_lt (tc->snd_wl1, seq) |
| 623 | || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 624 | { |
| 625 | tc->snd_wnd = snd_wnd; |
| 626 | tc->snd_wl1 = seq; |
| 627 | tc->snd_wl2 = ack; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 628 | TCP_EVT (TCP_EVT_SND_WND, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 629 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 630 | if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 631 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 632 | /* Set persist timer if not set and we just got 0 wnd */ |
| 633 | if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) |
| 634 | && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 635 | { |
| 636 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 637 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
| 638 | } |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 639 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 640 | else |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 641 | { |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 642 | if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST))) |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 643 | { |
| 644 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 645 | tcp_persist_timer_reset (&wrk->timer_wheel, tc); |
| 646 | } |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 647 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 648 | if (PREDICT_FALSE (tcp_is_descheduled (tc))) |
| 649 | tcp_reschedule (tc); |
| 650 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 651 | if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 652 | { |
| 653 | tc->rto_boff = 0; |
| 654 | tcp_update_rto (tc); |
| 655 | } |
| 656 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 657 | } |
| 658 | } |
| 659 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 660 | /** |
| 661 | * Init loss recovery/fast recovery. |
| 662 | * |
| 663 | * Triggered by dup acks as opposed to timer timeout. Note that cwnd is |
| 664 | * updated in @ref tcp_cc_handle_event after fast retransmit |
| 665 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 666 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 667 | tcp_cc_init_congestion (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 668 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 669 | tcp_fastrecovery_on (tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 670 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | 6216600 | 2018-04-18 16:40:55 -0700 | [diff] [blame] | 671 | tc->cwnd_acc_bytes = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 672 | tc->snd_rxt_bytes = 0; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 673 | tc->rxt_delivered = 0; |
| 674 | tc->prr_delivered = 0; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 675 | tc->prr_start = tc->snd_una; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 676 | tc->prev_ssthresh = tc->ssthresh; |
| 677 | tc->prev_cwnd = tc->cwnd; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 678 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 679 | tc->snd_rxt_ts = tcp_tstamp (tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 680 | tcp_cc_congestion (tc); |
| 681 | |
| 682 | /* Post retransmit update cwnd to ssthresh and account for the |
| 683 | * three segments that have left the network and should've been |
| 684 | * buffered at the receiver XXX */ |
| 685 | if (!tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | cc4d6d0 | 2020-07-29 23:03:39 -0700 | [diff] [blame] | 686 | tc->cwnd += TCP_DUPACK_THRESHOLD * tc->snd_mss; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 687 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 688 | tc->fr_occurences += 1; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 689 | TCP_EVT (TCP_EVT_CC_EVT, tc, 4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 690 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 691 | |
| 692 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 693 | tcp_cc_congestion_undo (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 694 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 695 | tc->cwnd = tc->prev_cwnd; |
| 696 | tc->ssthresh = tc->prev_ssthresh; |
Florin Coras | eff6b82 | 2019-07-03 19:51:02 -0700 | [diff] [blame] | 697 | tcp_cc_undo_recovery (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 698 | ASSERT (tc->rto_boff == 0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 699 | TCP_EVT (TCP_EVT_CC_EVT, tc, 5); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 700 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 701 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 702 | static inline u8 |
| 703 | tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 704 | { |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 705 | return (tcp_in_recovery (tc) && tc->rto_boff == 1 |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 706 | && tc->snd_rxt_ts |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 707 | && tcp_opts_tstamp (&tc->rcv_opts) |
| 708 | && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); |
| 709 | } |
| 710 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 711 | static inline u8 |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 712 | tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) |
| 713 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 714 | return (tcp_cc_is_spurious_timeout_rxt (tc)); |
| 715 | } |
| 716 | |
| 717 | static inline u8 |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 718 | tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 719 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 720 | if (!has_sack) |
| 721 | { |
| 722 | /* If of of the two conditions lower hold, reset dupacks because |
| 723 | * we're probably after timeout (RFC6582 heuristics). |
| 724 | * If Cumulative ack does not cover more than congestion threshold, |
| 725 | * and: |
| 726 | * 1) The following doesn't hold: The congestion window is greater |
| 727 | * than SMSS bytes and the difference between highest_ack |
| 728 | * and prev_highest_ack is at most 4*SMSS bytes |
| 729 | * 2) Echoed timestamp in the last non-dup ack does not equal the |
| 730 | * stored timestamp |
| 731 | */ |
| 732 | if (seq_leq (tc->snd_una, tc->snd_congestion) |
| 733 | && ((!(tc->cwnd > tc->snd_mss |
| 734 | && tc->bytes_acked <= 4 * tc->snd_mss)) |
| 735 | || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) |
| 736 | { |
| 737 | tc->rcv_dupacks = 0; |
| 738 | return 0; |
| 739 | } |
| 740 | } |
Florin Coras | cc4d6d0 | 2020-07-29 23:03:39 -0700 | [diff] [blame] | 741 | 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] | 742 | } |
| 743 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 744 | static int |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 745 | tcp_cc_recover (tcp_connection_t * tc) |
| 746 | { |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 747 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 748 | u8 is_spurious = 0; |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 749 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 750 | ASSERT (tcp_in_cong_recovery (tc)); |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 751 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 752 | if (tcp_cc_is_spurious_retransmit (tc)) |
| 753 | { |
| 754 | tcp_cc_congestion_undo (tc); |
| 755 | is_spurious = 1; |
| 756 | } |
| 757 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 758 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 759 | tc->rcv_dupacks = 0; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 760 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 761 | /* Previous recovery left us congested. Continue sending as part |
| 762 | * of the current recovery event with an updated snd_congestion */ |
| 763 | if (tc->sack_sb.sacked_bytes) |
| 764 | { |
| 765 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 766 | tcp_program_retransmit (tc); |
| 767 | return is_spurious; |
| 768 | } |
| 769 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 770 | tc->rxt_delivered = 0; |
| 771 | tc->snd_rxt_bytes = 0; |
| 772 | tc->snd_rxt_ts = 0; |
| 773 | tc->prr_delivered = 0; |
| 774 | tc->rtt_ts = 0; |
| 775 | tc->flags &= ~TCP_CONN_RXT_PENDING; |
| 776 | |
Florin Coras | 321cfa5 | 2019-09-12 18:49:44 -0700 | [diff] [blame] | 777 | hole = scoreboard_first_hole (&tc->sack_sb); |
| 778 | if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt) |
| 779 | scoreboard_clear (&tc->sack_sb); |
| 780 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 781 | if (!tcp_in_recovery (tc) && !is_spurious) |
| 782 | tcp_cc_recovered (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 783 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 784 | tcp_fastrecovery_off (tc); |
| 785 | tcp_fastrecovery_first_off (tc); |
| 786 | tcp_recovery_off (tc); |
| 787 | TCP_EVT (TCP_EVT_CC_EVT, tc, 3); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 788 | |
| 789 | ASSERT (tc->rto_boff == 0); |
| 790 | ASSERT (!tcp_in_cong_recovery (tc)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 791 | ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 792 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 793 | return is_spurious; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 794 | } |
| 795 | |
| 796 | static void |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 797 | tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 798 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 799 | ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 800 | |
| 801 | /* Congestion avoidance */ |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 802 | tcp_cc_rcv_ack (tc, rs); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 803 | |
| 804 | /* If a cumulative ack, make sure dupacks is 0 */ |
| 805 | tc->rcv_dupacks = 0; |
| 806 | |
| 807 | /* When dupacks hits the threshold we only enter fast retransmit if |
| 808 | * cumulative ack covers more than snd_congestion. Should snd_una |
| 809 | * wrap this test may fail under otherwise valid circumstances. |
| 810 | * Therefore, proactively update snd_congestion when wrap detected. */ |
| 811 | if (PREDICT_FALSE |
| 812 | (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked) |
| 813 | && seq_gt (tc->snd_congestion, tc->snd_una))) |
| 814 | tc->snd_congestion = tc->snd_una - 1; |
| 815 | } |
| 816 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 817 | /** |
| 818 | * One function to rule them all ... and in the darkness bind them |
| 819 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 820 | static void |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 821 | tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs, |
| 822 | u32 is_dack) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 823 | { |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 824 | u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 825 | |
Florin Coras | 1de7167 | 2019-12-22 09:20:26 -0800 | [diff] [blame] | 826 | /* If reneging, wait for timer based retransmits */ |
| 827 | if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging)) |
| 828 | return; |
| 829 | |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 830 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 831 | * If not in recovery, figure out if we should enter |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 832 | */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 833 | if (!tcp_in_cong_recovery (tc)) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 834 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 835 | ASSERT (is_dack); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 836 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 837 | tc->rcv_dupacks++; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 838 | TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); |
| 839 | tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 840 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 841 | if (tcp_should_fastrecover (tc, has_sack)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 842 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 843 | tcp_cc_init_congestion (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 844 | |
Florin Coras | afef8bf | 2019-09-11 23:22:29 -0700 | [diff] [blame] | 845 | if (has_sack) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 846 | scoreboard_init_rxt (&tc->sack_sb, tc->snd_una); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 847 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 848 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ ); |
| 849 | tcp_program_retransmit (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 850 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 851 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 852 | return; |
| 853 | } |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 854 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 855 | /* |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 856 | * Already in recovery |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 857 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 858 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 859 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 860 | * Process (re)transmit feedback. Output path uses this to decide how much |
| 861 | * more data to release into the network |
| 862 | */ |
| 863 | if (has_sack) |
| 864 | { |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 865 | if (!tc->bytes_acked && tc->sack_sb.rxt_sacked) |
| 866 | tcp_fastrecovery_first_on (tc); |
| 867 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 868 | tc->rxt_delivered += tc->sack_sb.rxt_sacked; |
| 869 | tc->prr_delivered += tc->bytes_acked + tc->sack_sb.last_sacked_bytes |
| 870 | - tc->sack_sb.last_bytes_delivered; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 871 | } |
| 872 | else |
| 873 | { |
| 874 | if (is_dack) |
| 875 | { |
| 876 | tc->rcv_dupacks += 1; |
| 877 | TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1); |
| 878 | } |
Florin Coras | 56cef05 | 2020-01-15 20:18:35 +0000 | [diff] [blame] | 879 | tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked, |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 880 | tc->snd_rxt_bytes); |
| 881 | if (is_dack) |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 882 | tc->prr_delivered += clib_min (tc->snd_mss, |
| 883 | tc->snd_nxt - tc->snd_una); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 884 | else |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 885 | tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked, |
| 886 | tc->snd_mss * |
| 887 | tc->rcv_dupacks); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 888 | |
| 889 | /* If partial ack, assume that the first un-acked segment was lost */ |
| 890 | if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) |
| 891 | tcp_fastrecovery_first_on (tc); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | /* |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 895 | * See if we can exit and stop retransmitting |
| 896 | */ |
| 897 | if (seq_geq (tc->snd_una, tc->snd_congestion)) |
| 898 | { |
| 899 | /* If spurious return, we've already updated everything */ |
| 900 | if (tcp_cc_recover (tc)) |
| 901 | { |
| 902 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 903 | return; |
| 904 | } |
| 905 | |
| 906 | /* Treat as congestion avoidance ack */ |
| 907 | tcp_cc_rcv_ack (tc, rs); |
| 908 | return; |
| 909 | } |
| 910 | |
Florin Coras | 34177e8 | 2020-03-20 20:25:37 +0000 | [diff] [blame] | 911 | tcp_program_retransmit (tc); |
| 912 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 913 | /* |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 914 | * Notify cc of the event |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 915 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 916 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 917 | if (!tc->bytes_acked) |
| 918 | { |
| 919 | tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs); |
| 920 | return; |
| 921 | } |
| 922 | |
| 923 | /* RFC6675: If the incoming ACK is a cumulative acknowledgment, |
| 924 | * reset dupacks to 0. Also needed if in congestion recovery */ |
| 925 | tc->rcv_dupacks = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 926 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 927 | if (tcp_in_recovery (tc)) |
| 928 | tcp_cc_rcv_ack (tc, rs); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 929 | else |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 930 | tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 931 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 932 | |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 933 | static void |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 934 | 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] | 935 | { |
| 936 | if (!tcp_in_cong_recovery (tc)) |
| 937 | return; |
| 938 | |
| 939 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 940 | tcp_rcv_sacks (tc, tc->snd_una); |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 941 | |
| 942 | tc->bytes_acked = 0; |
| 943 | |
| 944 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 945 | tcp_bt_sample_delivery_rate (tc, rs); |
| 946 | |
| 947 | tcp_cc_handle_event (tc, rs, 1); |
| 948 | } |
| 949 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 950 | /** |
| 951 | * Check if duplicate ack as per RFC5681 Sec. 2 |
| 952 | */ |
| 953 | always_inline u8 |
| 954 | tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, |
| 955 | u32 prev_snd_una) |
| 956 | { |
| 957 | return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) |
| 958 | && seq_gt (tc->snd_nxt, tc->snd_una) |
| 959 | && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) |
| 960 | && (prev_snd_wnd == tc->snd_wnd)); |
| 961 | } |
| 962 | |
| 963 | /** |
| 964 | * Checks if ack is a congestion control event. |
| 965 | */ |
| 966 | static u8 |
| 967 | tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, |
| 968 | u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) |
| 969 | { |
| 970 | /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are |
| 971 | * defined to be 'duplicate' as well */ |
| 972 | *is_dack = tc->sack_sb.last_sacked_bytes |
| 973 | || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); |
| 974 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 975 | return (*is_dack || tcp_in_cong_recovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 976 | } |
| 977 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 978 | /** |
| 979 | * Process incoming ACK |
| 980 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 981 | static int |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 982 | 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] | 983 | tcp_header_t * th, u32 * error) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 984 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 985 | u32 prev_snd_wnd, prev_snd_una; |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 986 | tcp_rate_sample_t rs = { 0 }; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 987 | u8 is_dack; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 988 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 989 | TCP_EVT (TCP_EVT_CC_STAT, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 990 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 991 | /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 992 | 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] | 993 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 994 | /* We've probably entered recovery and the peer still has some |
| 995 | * of the data we've sent. Update snd_nxt and accept the ack */ |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 996 | if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt) |
Florin Coras | 282a3cb | 2019-04-02 21:43:38 -0700 | [diff] [blame] | 997 | && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 998 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 999 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1000 | goto process_ack; |
| 1001 | } |
| 1002 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1003 | tc->errors.above_ack_wnd += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1004 | *error = TCP_ERROR_ACK_FUTURE; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1005 | 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] | 1006 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1007 | } |
| 1008 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1009 | /* If old ACK, probably it's an old dupack */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1010 | 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] | 1011 | { |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1012 | tc->errors.below_ack_wnd += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1013 | *error = TCP_ERROR_ACK_OLD; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1014 | 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] | 1015 | |
| 1016 | if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd)) |
| 1017 | return -1; |
| 1018 | |
Florin Coras | 067f8f9 | 2020-01-04 00:53:04 +0000 | [diff] [blame] | 1019 | tcp_handle_old_ack (tc, &rs); |
Florin Coras | 2f04cb9 | 2019-12-23 10:03:27 -0800 | [diff] [blame] | 1020 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1021 | /* Don't drop yet */ |
| 1022 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1023 | } |
| 1024 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1025 | process_ack: |
| 1026 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1027 | /* |
| 1028 | * Looks okay, process feedback |
| 1029 | */ |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1030 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1031 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1032 | tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); |
| 1033 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1034 | prev_snd_wnd = tc->snd_wnd; |
| 1035 | prev_snd_una = tc->snd_una; |
| 1036 | tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, |
| 1037 | vnet_buffer (b)->tcp.ack_number, |
| 1038 | clib_net_to_host_u16 (th->window) << tc->snd_wscale); |
| 1039 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
Florin Coras | 558e3e0 | 2019-09-06 12:56:58 -0700 | [diff] [blame] | 1040 | tc->snd_una = vnet_buffer (b)->tcp.ack_number; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1041 | tcp_validate_txf_size (tc, tc->bytes_acked); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1042 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1043 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | 1dbda64 | 2019-09-11 13:42:57 -0700 | [diff] [blame] | 1044 | tcp_bt_sample_delivery_rate (tc, &rs); |
| 1045 | |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 1046 | if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes) |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1047 | { |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1048 | tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 8ddd19b | 2020-06-07 20:06:56 +0000 | [diff] [blame] | 1049 | if (tc->bytes_acked) |
| 1050 | tcp_program_dequeue (wrk, tc); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1051 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1052 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1053 | TCP_EVT (TCP_EVT_ACK_RCVD, tc); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1054 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1055 | /* |
| 1056 | * Check if we have congestion event |
| 1057 | */ |
| 1058 | |
| 1059 | 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] | 1060 | { |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1061 | tcp_cc_handle_event (tc, &rs, is_dack); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1062 | tc->dupacks_in += is_dack; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1063 | if (!tcp_in_cong_recovery (tc)) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 1064 | { |
| 1065 | *error = TCP_ERROR_ACK_OK; |
| 1066 | return 0; |
| 1067 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1068 | *error = TCP_ERROR_ACK_DUP; |
Florin Coras | ca09d07 | 2018-10-01 18:31:02 -0700 | [diff] [blame] | 1069 | if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th)) |
| 1070 | return 0; |
| 1071 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1072 | } |
| 1073 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1074 | /* |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1075 | * Update congestion control (slow start/congestion avoidance) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1076 | */ |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1077 | tcp_cc_update (tc, &rs); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1078 | *error = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1079 | return 0; |
| 1080 | } |
| 1081 | |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1082 | static void |
| 1083 | tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 1084 | { |
| 1085 | if (!tcp_disconnect_pending (tc)) |
| 1086 | { |
| 1087 | vec_add1 (wrk->pending_disconnects, tc->c_c_index); |
| 1088 | tcp_disconnect_pending_on (tc); |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | static void |
| 1093 | tcp_handle_disconnects (tcp_worker_ctx_t * wrk) |
| 1094 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1095 | u32 thread_index, *pending_disconnects, *pending_resets; |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1096 | tcp_connection_t *tc; |
| 1097 | int i; |
| 1098 | |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1099 | if (vec_len (wrk->pending_disconnects)) |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1100 | { |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1101 | thread_index = wrk->vm->thread_index; |
| 1102 | pending_disconnects = wrk->pending_disconnects; |
| 1103 | for (i = 0; i < vec_len (pending_disconnects); i++) |
| 1104 | { |
| 1105 | tc = tcp_connection_get (pending_disconnects[i], thread_index); |
| 1106 | tcp_disconnect_pending_off (tc); |
| 1107 | session_transport_closing_notify (&tc->connection); |
| 1108 | } |
| 1109 | _vec_len (wrk->pending_disconnects) = 0; |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1110 | } |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1111 | |
| 1112 | if (vec_len (wrk->pending_resets)) |
| 1113 | { |
| 1114 | thread_index = wrk->vm->thread_index; |
| 1115 | pending_resets = wrk->pending_resets; |
| 1116 | for (i = 0; i < vec_len (pending_resets); i++) |
| 1117 | { |
| 1118 | tc = tcp_connection_get (pending_resets[i], thread_index); |
| 1119 | tcp_disconnect_pending_off (tc); |
| 1120 | tcp_handle_rst (tc); |
| 1121 | } |
| 1122 | _vec_len (wrk->pending_resets) = 0; |
| 1123 | } |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | static void |
| 1127 | tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, |
| 1128 | u32 * error) |
| 1129 | { |
Florin Coras | f73d4c2 | 2019-06-28 09:18:48 -0700 | [diff] [blame] | 1130 | /* Reject out-of-order fins */ |
| 1131 | if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt) |
| 1132 | return; |
| 1133 | |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1134 | /* Account for the FIN and send ack */ |
| 1135 | tc->rcv_nxt += 1; |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1136 | tc->flags |= TCP_CONN_FINRCVD; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1137 | tcp_program_ack (tc); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1138 | /* Enter CLOSE-WAIT and notify session. To avoid lingering |
| 1139 | * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1140 | tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1141 | tcp_program_disconnect (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1142 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| 1143 | tcp_cfg.closewait_time); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1144 | TCP_EVT (TCP_EVT_FIN_RCVD, tc); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1145 | *error = TCP_ERROR_FIN_RCVD; |
| 1146 | } |
| 1147 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1148 | /** Enqueue data for delivery to application */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1149 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1150 | tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1151 | u16 data_len) |
| 1152 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1153 | int written, error = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1154 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1155 | ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1156 | ASSERT (data_len); |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1157 | written = session_enqueue_stream_connection (&tc->connection, b, 0, |
| 1158 | 1 /* queue event */ , 1); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1159 | tc->bytes_in += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1160 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1161 | TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1162 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1163 | /* Update rcv_nxt */ |
| 1164 | if (PREDICT_TRUE (written == data_len)) |
| 1165 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1166 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1167 | } |
| 1168 | /* If more data written than expected, account for out-of-order bytes. */ |
| 1169 | else if (written > data_len) |
| 1170 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1171 | tc->rcv_nxt += written; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1172 | TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1173 | } |
| 1174 | else if (written > 0) |
| 1175 | { |
| 1176 | /* We've written something but FIFO is probably full now */ |
| 1177 | tc->rcv_nxt += written; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1178 | error = TCP_ERROR_PARTIALLY_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1179 | } |
| 1180 | else |
| 1181 | { |
Florin Coras | dfd980f | 2020-03-26 02:45:39 +0000 | [diff] [blame] | 1182 | /* Packet made it through for ack processing */ |
| 1183 | if (tc->rcv_wnd < tc->snd_mss) |
| 1184 | return TCP_ERROR_ZERO_RWND; |
| 1185 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1186 | return TCP_ERROR_FIFO_FULL; |
| 1187 | } |
| 1188 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1189 | /* Update SACK list if need be */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1190 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1191 | { |
| 1192 | /* Remove SACK blocks that have been delivered */ |
| 1193 | tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); |
| 1194 | } |
| 1195 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1196 | return error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | /** Enqueue out-of-order data */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1200 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1201 | tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1202 | u16 data_len) |
| 1203 | { |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1204 | session_t *s0; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1205 | int rv, offset; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1206 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1207 | ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1208 | ASSERT (data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1209 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1210 | /* Enqueue out-of-order data with relative offset */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1211 | rv = session_enqueue_stream_connection (&tc->connection, b, |
| 1212 | vnet_buffer (b)->tcp.seq_number - |
| 1213 | tc->rcv_nxt, 0 /* queue event */ , |
| 1214 | 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1215 | |
| 1216 | /* Nothing written */ |
| 1217 | if (rv) |
| 1218 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1219 | TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1220 | return TCP_ERROR_FIFO_FULL; |
| 1221 | } |
| 1222 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1223 | TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1224 | tc->bytes_in += data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1225 | |
| 1226 | /* Update SACK list if in use */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1227 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1228 | { |
| 1229 | ooo_segment_t *newest; |
| 1230 | u32 start, end; |
| 1231 | |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1232 | s0 = session_get (tc->c_s_index, tc->c_thread_index); |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1233 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1234 | /* Get the newest segment from the fifo */ |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1235 | newest = svm_fifo_newest_ooo_segment (s0->rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1236 | if (newest) |
| 1237 | { |
Sirshak Das | 28aa539 | 2019-02-05 01:33:33 -0600 | [diff] [blame] | 1238 | offset = ooo_segment_offset_prod (s0->rx_fifo, newest); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1239 | ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); |
| 1240 | start = tc->rcv_nxt + offset; |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1241 | end = start + ooo_segment_length (s0->rx_fifo, newest); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1242 | tcp_update_sack_list (tc, start, end); |
Florin Coras | 288eaab | 2019-02-03 15:26:14 -0800 | [diff] [blame] | 1243 | svm_fifo_newest_ooo_segment_reset (s0->rx_fifo); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1244 | TCP_EVT (TCP_EVT_CC_SACKS, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1245 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1246 | } |
| 1247 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1248 | return TCP_ERROR_ENQUEUED_OOO; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1249 | } |
| 1250 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1251 | static int |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1252 | tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) |
| 1253 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1254 | u32 discard, first = b->current_length; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1255 | vlib_main_t *vm = vlib_get_main (); |
| 1256 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1257 | /* Handle multi-buffer segments */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1258 | if (n_bytes_to_drop > b->current_length) |
| 1259 | { |
| 1260 | if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1261 | return -1; |
| 1262 | do |
| 1263 | { |
| 1264 | discard = clib_min (n_bytes_to_drop, b->current_length); |
| 1265 | vlib_buffer_advance (b, discard); |
| 1266 | b = vlib_get_buffer (vm, b->next_buffer); |
| 1267 | n_bytes_to_drop -= discard; |
| 1268 | } |
| 1269 | while (n_bytes_to_drop); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1270 | if (n_bytes_to_drop > first) |
| 1271 | b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1272 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1273 | else |
| 1274 | vlib_buffer_advance (b, n_bytes_to_drop); |
| 1275 | vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1276 | return 0; |
| 1277 | } |
| 1278 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1279 | /** |
| 1280 | * Receive buffer for connection and handle acks |
| 1281 | * |
| 1282 | * It handles both in order or out-of-order data. |
| 1283 | */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1284 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1285 | tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1286 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1287 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1288 | u32 error, n_bytes_to_drop, n_data_bytes; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1289 | |
| 1290 | vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); |
| 1291 | n_data_bytes = vnet_buffer (b)->tcp.data_len; |
| 1292 | ASSERT (n_data_bytes); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1293 | tc->data_segs_in += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1294 | |
Florin Coras | 1f85dad | 2020-11-05 13:39:48 -0800 | [diff] [blame] | 1295 | /* Make sure we don't consume trailing bytes */ |
Florin Coras | ab0a87f | 2020-11-09 19:03:09 -0800 | [diff] [blame] | 1296 | if (PREDICT_FALSE (b->current_length > n_data_bytes)) |
Florin Coras | 1f85dad | 2020-11-05 13:39:48 -0800 | [diff] [blame] | 1297 | b->current_length = n_data_bytes; |
| 1298 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1299 | /* Handle out-of-order data */ |
| 1300 | if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) |
| 1301 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1302 | /* Old sequence numbers allowed through because they overlapped |
| 1303 | * the rx window */ |
| 1304 | if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1305 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1306 | /* Completely in the past (possible retransmit). Ack |
| 1307 | * retransmissions since we may not have any data to send */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1308 | if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1309 | { |
Florin Coras | 7fd59cc | 2020-03-12 15:50:57 +0000 | [diff] [blame] | 1310 | tcp_program_dupack (tc); |
| 1311 | tc->errors.below_data_wnd++; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1312 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1313 | goto done; |
| 1314 | } |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1315 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1316 | /* Chop off the bytes in the past and see if what is left |
| 1317 | * can be enqueued in order */ |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1318 | n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; |
| 1319 | n_data_bytes -= n_bytes_to_drop; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1320 | vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1321 | if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1322 | { |
| 1323 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1324 | goto done; |
| 1325 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1326 | goto in_order; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1327 | } |
| 1328 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1329 | /* RFC2581: Enqueue and send DUPACK for fast retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1330 | error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1331 | tcp_program_dupack (tc); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1332 | TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1333 | tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end, |
| 1334 | tc->rcv_las + tc->rcv_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1335 | goto done; |
| 1336 | } |
| 1337 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1338 | in_order: |
| 1339 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1340 | /* In order data, enqueue. Fifo figures out by itself if any out-of-order |
| 1341 | * segments can be enqueued after fifo tail offset changes. */ |
| 1342 | error = tcp_session_enqueue_data (tc, b, n_data_bytes); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1343 | tcp_program_ack (tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1344 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1345 | done: |
| 1346 | return error; |
| 1347 | } |
| 1348 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1349 | typedef struct |
| 1350 | { |
| 1351 | tcp_header_t tcp_header; |
| 1352 | tcp_connection_t tcp_connection; |
| 1353 | } tcp_rx_trace_t; |
| 1354 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1355 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1356 | format_tcp_rx_trace (u8 * s, va_list * args) |
| 1357 | { |
| 1358 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1359 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1360 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 1361 | tcp_connection_t *tc = &t->tcp_connection; |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 1362 | u32 indent = format_get_indent (s); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1363 | |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 1364 | s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc, |
| 1365 | format_tcp_state, tc->state, format_white_space, indent, |
| 1366 | format_tcp_header, &t->tcp_header, 128); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1367 | |
| 1368 | return s; |
| 1369 | } |
| 1370 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1371 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1372 | format_tcp_rx_trace_short (u8 * s, va_list * args) |
| 1373 | { |
| 1374 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1375 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1376 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1377 | |
| 1378 | s = format (s, "%d -> %d (%U)", |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1379 | clib_net_to_host_u16 (t->tcp_header.dst_port), |
| 1380 | 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] | 1381 | t->tcp_connection.state); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1382 | |
| 1383 | return s; |
| 1384 | } |
| 1385 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1386 | static void |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1387 | tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, |
| 1388 | tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) |
| 1389 | { |
| 1390 | if (tc0) |
| 1391 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1392 | clib_memcpy_fast (&t0->tcp_connection, tc0, |
| 1393 | sizeof (t0->tcp_connection)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1394 | } |
| 1395 | else |
| 1396 | { |
| 1397 | th0 = tcp_buffer_hdr (b0); |
| 1398 | } |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1399 | clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1400 | } |
| 1401 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1402 | static void |
| 1403 | tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1404 | vlib_frame_t * frame, u8 is_ip4) |
| 1405 | { |
| 1406 | u32 *from, n_left; |
| 1407 | |
| 1408 | n_left = frame->n_vectors; |
| 1409 | from = vlib_frame_vector_args (frame); |
| 1410 | |
| 1411 | while (n_left >= 1) |
| 1412 | { |
| 1413 | tcp_connection_t *tc0; |
| 1414 | tcp_rx_trace_t *t0; |
| 1415 | tcp_header_t *th0; |
| 1416 | vlib_buffer_t *b0; |
| 1417 | u32 bi0; |
| 1418 | |
| 1419 | bi0 = from[0]; |
| 1420 | b0 = vlib_get_buffer (vm, bi0); |
| 1421 | |
| 1422 | if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| 1423 | { |
| 1424 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 1425 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 1426 | vm->thread_index); |
| 1427 | th0 = tcp_buffer_hdr (b0); |
| 1428 | tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); |
| 1429 | } |
| 1430 | |
| 1431 | from += 1; |
| 1432 | n_left -= 1; |
| 1433 | } |
| 1434 | } |
| 1435 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1436 | always_inline void |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1437 | tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node, |
| 1438 | u8 is_ip4, u32 evt, u32 val) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1439 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1440 | if (is_ip4) |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1441 | vlib_node_increment_counter (vm, tcp4_node, evt, val); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1442 | else |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1443 | vlib_node_increment_counter (vm, tcp6_node, evt, val); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1444 | } |
| 1445 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1446 | #define tcp_maybe_inc_counter(node_id, err, count) \ |
| 1447 | { \ |
| 1448 | if (next0 != tcp_next_drop (is_ip4)) \ |
| 1449 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 1450 | tcp6_##node_id##_node.index, is_ip4, err, \ |
| 1451 | 1); \ |
| 1452 | } |
| 1453 | #define tcp_inc_counter(node_id, err, count) \ |
| 1454 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 1455 | tcp6_##node_id##_node.index, is_ip4, \ |
| 1456 | err, count) |
| 1457 | #define tcp_maybe_inc_err_counter(cnts, err) \ |
| 1458 | { \ |
| 1459 | cnts[err] += (next0 != tcp_next_drop (is_ip4)); \ |
| 1460 | } |
| 1461 | #define tcp_inc_err_counter(cnts, err, val) \ |
| 1462 | { \ |
| 1463 | cnts[err] += val; \ |
| 1464 | } |
| 1465 | #define tcp_store_err_counters(node_id, cnts) \ |
| 1466 | { \ |
| 1467 | int i; \ |
| 1468 | for (i = 0; i < TCP_N_ERROR; i++) \ |
| 1469 | if (cnts[i]) \ |
| 1470 | tcp_inc_counter(node_id, i, cnts[i]); \ |
| 1471 | } |
| 1472 | |
| 1473 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1474 | always_inline uword |
| 1475 | tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1476 | vlib_frame_t * frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1477 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1478 | u32 thread_index = vm->thread_index, errors = 0; |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1479 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1480 | u32 n_left_from, *from, *first_buffer; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1481 | u16 err_counters[TCP_N_ERROR] = { 0 }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1482 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1483 | if (node->flags & VLIB_NODE_FLAG_TRACE) |
| 1484 | tcp_established_trace_frame (vm, node, frame, is_ip4); |
| 1485 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1486 | first_buffer = from = vlib_frame_vector_args (frame); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1487 | n_left_from = frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1488 | |
| 1489 | while (n_left_from > 0) |
| 1490 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1491 | u32 bi0, error0 = TCP_ERROR_ACK_OK; |
| 1492 | vlib_buffer_t *b0; |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1493 | tcp_header_t *th0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1494 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1495 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1496 | if (n_left_from > 1) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1497 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1498 | vlib_buffer_t *pb; |
| 1499 | pb = vlib_get_buffer (vm, from[1]); |
| 1500 | vlib_prefetch_buffer_header (pb, LOAD); |
| 1501 | CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1502 | } |
| 1503 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1504 | bi0 = from[0]; |
| 1505 | from += 1; |
| 1506 | n_left_from -= 1; |
| 1507 | |
| 1508 | b0 = vlib_get_buffer (vm, bi0); |
| 1509 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 1510 | thread_index); |
| 1511 | |
| 1512 | if (PREDICT_FALSE (tc0 == 0)) |
| 1513 | { |
| 1514 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 1515 | goto done; |
| 1516 | } |
| 1517 | |
| 1518 | th0 = tcp_buffer_hdr (b0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1519 | |
| 1520 | /* TODO header prediction fast path */ |
| 1521 | |
| 1522 | /* 1-4: check SEQ, RST, SYN */ |
| 1523 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, th0, &error0))) |
| 1524 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1525 | TCP_EVT (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1526 | goto done; |
| 1527 | } |
| 1528 | |
| 1529 | /* 5: check the ACK field */ |
| 1530 | if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0))) |
| 1531 | goto done; |
| 1532 | |
| 1533 | /* 6: check the URG bit TODO */ |
| 1534 | |
| 1535 | /* 7: process the segment text */ |
| 1536 | if (vnet_buffer (b0)->tcp.data_len) |
| 1537 | error0 = tcp_segment_rcv (wrk, tc0, b0); |
| 1538 | |
| 1539 | /* 8: check the FIN bit */ |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1540 | if (PREDICT_FALSE (tcp_is_fin (th0))) |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1541 | tcp_rcv_fin (wrk, tc0, b0, &error0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1542 | |
| 1543 | done: |
| 1544 | tcp_inc_err_counter (err_counters, error0, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1545 | } |
| 1546 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1547 | errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 1548 | thread_index); |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 1549 | err_counters[TCP_ERROR_MSG_QUEUE_FULL] = errors; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1550 | tcp_store_err_counters (established, err_counters); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1551 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1552 | tcp_handle_disconnects (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1553 | vlib_buffer_free (vm, first_buffer, frame->n_vectors); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1554 | |
| 1555 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1556 | } |
| 1557 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1558 | VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm, |
| 1559 | vlib_node_runtime_t * node, |
| 1560 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1561 | { |
| 1562 | return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 1563 | } |
| 1564 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1565 | VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm, |
| 1566 | vlib_node_runtime_t * node, |
| 1567 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1568 | { |
| 1569 | return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 1570 | } |
| 1571 | |
| 1572 | /* *INDENT-OFF* */ |
| 1573 | VLIB_REGISTER_NODE (tcp4_established_node) = |
| 1574 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1575 | .name = "tcp4-established", |
| 1576 | /* Takes a vector of packets. */ |
| 1577 | .vector_size = sizeof (u32), |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 1578 | .n_errors = TCP_N_ERROR, |
| 1579 | .error_strings = tcp_error_strings, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1580 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 1581 | .next_nodes = |
| 1582 | { |
| 1583 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 1584 | foreach_tcp_state_next |
| 1585 | #undef _ |
| 1586 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1587 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1588 | }; |
| 1589 | /* *INDENT-ON* */ |
| 1590 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1591 | /* *INDENT-OFF* */ |
| 1592 | VLIB_REGISTER_NODE (tcp6_established_node) = |
| 1593 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1594 | .name = "tcp6-established", |
| 1595 | /* Takes a vector of packets. */ |
| 1596 | .vector_size = sizeof (u32), |
| 1597 | .n_errors = TCP_N_ERROR, |
| 1598 | .error_strings = tcp_error_strings, |
| 1599 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 1600 | .next_nodes = |
| 1601 | { |
| 1602 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 1603 | foreach_tcp_state_next |
| 1604 | #undef _ |
| 1605 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1606 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1607 | }; |
| 1608 | /* *INDENT-ON* */ |
| 1609 | |
| 1610 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1611 | static u8 |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1612 | tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1613 | tcp_header_t * hdr) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1614 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1615 | transport_connection_t *tmp = 0; |
| 1616 | u64 handle; |
| 1617 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1618 | if (!tc) |
| 1619 | return 1; |
| 1620 | |
Florin Coras | 7013113 | 2017-11-27 02:43:30 -0800 | [diff] [blame] | 1621 | /* Proxy case */ |
| 1622 | if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) |
| 1623 | return 1; |
| 1624 | |
Florin Coras | 07df791 | 2019-11-07 08:26:06 -0800 | [diff] [blame] | 1625 | u8 is_ip_valid = 0, val_l, val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1626 | |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1627 | if (tc->connection.is_ip4) |
| 1628 | { |
| 1629 | 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] | 1630 | |
| 1631 | val_l = !ip4_address_compare (&ip4_hdr->dst_address, |
| 1632 | &tc->connection.lcl_ip.ip4); |
| 1633 | val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1); |
| 1634 | val_r = !ip4_address_compare (&ip4_hdr->src_address, |
| 1635 | &tc->connection.rmt_ip.ip4); |
| 1636 | val_r = val_r || tc->state == TCP_STATE_LISTEN; |
| 1637 | is_ip_valid = val_l && val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1638 | } |
| 1639 | else |
| 1640 | { |
| 1641 | 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] | 1642 | |
| 1643 | val_l = !ip6_address_compare (&ip6_hdr->dst_address, |
| 1644 | &tc->connection.lcl_ip.ip6); |
| 1645 | val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0); |
| 1646 | val_r = !ip6_address_compare (&ip6_hdr->src_address, |
| 1647 | &tc->connection.rmt_ip.ip6); |
| 1648 | val_r = val_r || tc->state == TCP_STATE_LISTEN; |
| 1649 | is_ip_valid = val_l && val_r; |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1650 | } |
| 1651 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1652 | u8 is_valid = (tc->c_lcl_port == hdr->dst_port |
| 1653 | && (tc->state == TCP_STATE_LISTEN |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1654 | || tc->c_rmt_port == hdr->src_port) && is_ip_valid); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1655 | |
| 1656 | if (!is_valid) |
| 1657 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1658 | handle = session_lookup_half_open_handle (&tc->connection); |
| 1659 | tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF, |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1660 | tc->c_proto, tc->c_is_ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1661 | |
| 1662 | if (tmp) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1663 | { |
| 1664 | if (tmp->lcl_port == hdr->dst_port |
| 1665 | && tmp->rmt_port == hdr->src_port) |
| 1666 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1667 | TCP_DBG ("half-open is valid!"); |
Ryujiro Shibuya | 3ea17d5 | 2019-11-05 07:24:32 +0000 | [diff] [blame] | 1668 | is_valid = 1; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1669 | } |
| 1670 | } |
| 1671 | } |
| 1672 | return is_valid; |
| 1673 | } |
| 1674 | |
| 1675 | /** |
| 1676 | * Lookup transport connection |
| 1677 | */ |
| 1678 | static tcp_connection_t * |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1679 | tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, |
| 1680 | u8 is_ip4) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1681 | { |
| 1682 | tcp_header_t *tcp; |
| 1683 | transport_connection_t *tconn; |
| 1684 | tcp_connection_t *tc; |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1685 | u8 is_filtered = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1686 | if (is_ip4) |
| 1687 | { |
| 1688 | ip4_header_t *ip4; |
| 1689 | ip4 = vlib_buffer_get_current (b); |
| 1690 | tcp = ip4_next_header (ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1691 | tconn = session_lookup_connection_wt4 (fib_index, |
| 1692 | &ip4->dst_address, |
| 1693 | &ip4->src_address, |
| 1694 | tcp->dst_port, |
| 1695 | tcp->src_port, |
| 1696 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1697 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1698 | tc = tcp_get_connection_from_transport (tconn); |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1699 | ASSERT (tcp_lookup_is_valid (tc, b, tcp)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1700 | } |
| 1701 | else |
| 1702 | { |
| 1703 | ip6_header_t *ip6; |
| 1704 | ip6 = vlib_buffer_get_current (b); |
| 1705 | tcp = ip6_next_header (ip6); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1706 | tconn = session_lookup_connection_wt6 (fib_index, |
| 1707 | &ip6->dst_address, |
| 1708 | &ip6->src_address, |
| 1709 | tcp->dst_port, |
| 1710 | tcp->src_port, |
| 1711 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 1712 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1713 | tc = tcp_get_connection_from_transport (tconn); |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 1714 | ASSERT (tcp_lookup_is_valid (tc, b, tcp)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1715 | } |
| 1716 | return tc; |
| 1717 | } |
| 1718 | |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 1719 | static tcp_connection_t * |
| 1720 | tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4) |
| 1721 | { |
| 1722 | session_t *s; |
| 1723 | |
| 1724 | if (is_ip4) |
| 1725 | { |
| 1726 | ip4_header_t *ip4 = vlib_buffer_get_current (b); |
| 1727 | tcp_header_t *tcp = tcp_buffer_hdr (b); |
| 1728 | s = session_lookup_listener4 (fib_index, |
| 1729 | &ip4->dst_address, |
| 1730 | tcp->dst_port, TRANSPORT_PROTO_TCP, 1); |
| 1731 | } |
| 1732 | else |
| 1733 | { |
| 1734 | ip6_header_t *ip6 = vlib_buffer_get_current (b); |
| 1735 | tcp_header_t *tcp = tcp_buffer_hdr (b); |
| 1736 | s = session_lookup_listener6 (fib_index, |
| 1737 | &ip6->dst_address, |
| 1738 | tcp->dst_port, TRANSPORT_PROTO_TCP, 1); |
| 1739 | |
| 1740 | } |
| 1741 | if (PREDICT_TRUE (s != 0)) |
| 1742 | return tcp_get_connection_from_transport (transport_get_listener |
| 1743 | (TRANSPORT_PROTO_TCP, |
| 1744 | s->connection_index)); |
| 1745 | else |
| 1746 | return 0; |
| 1747 | } |
| 1748 | |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1749 | always_inline void |
| 1750 | tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4) |
| 1751 | { |
| 1752 | vnet_main_t *vnm = vnet_get_main (); |
| 1753 | const dpo_id_t *dpo; |
| 1754 | const load_balance_t *lb; |
| 1755 | vnet_hw_interface_t *hw_if; |
| 1756 | u32 sw_if_idx, lb_idx; |
| 1757 | |
| 1758 | if (is_ipv4) |
| 1759 | { |
| 1760 | ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4); |
| 1761 | lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr); |
| 1762 | } |
| 1763 | else |
| 1764 | { |
| 1765 | ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6); |
| 1766 | lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr); |
| 1767 | } |
| 1768 | |
| 1769 | lb = load_balance_get (lb_idx); |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1770 | if (PREDICT_FALSE (lb->lb_n_buckets > 1)) |
| 1771 | return; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1772 | dpo = load_balance_get_bucket_i (lb, 0); |
| 1773 | |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1774 | sw_if_idx = dpo_get_urpf (dpo); |
| 1775 | if (PREDICT_FALSE (sw_if_idx == ~0)) |
| 1776 | return; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1777 | |
Simon Zhang | 79bfb9e | 2019-12-24 20:02:20 +0800 | [diff] [blame] | 1778 | hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx); |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1779 | if (hw_if->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) |
| 1780 | tc->cfg_flags |= TCP_CFG_F_TSO; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1781 | } |
| 1782 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1783 | always_inline uword |
| 1784 | tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1785 | vlib_frame_t * from_frame, int is_ip4) |
| 1786 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1787 | u32 n_left_from, *from, *first_buffer, errors = 0; |
| 1788 | u32 my_thread_index = vm->thread_index; |
| 1789 | tcp_worker_ctx_t *wrk = tcp_get_worker (my_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1790 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1791 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1792 | n_left_from = from_frame->n_vectors; |
| 1793 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1794 | while (n_left_from > 0) |
| 1795 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1796 | u32 bi0, ack0, seq0, error0 = TCP_ERROR_NONE; |
| 1797 | tcp_connection_t *tc0, *new_tc0; |
| 1798 | tcp_header_t *tcp0 = 0; |
| 1799 | tcp_rx_trace_t *t0; |
| 1800 | vlib_buffer_t *b0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1801 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1802 | bi0 = from[0]; |
| 1803 | from += 1; |
| 1804 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1805 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1806 | b0 = vlib_get_buffer (vm, bi0); |
| 1807 | tc0 = |
| 1808 | tcp_half_open_connection_get (vnet_buffer (b0)->tcp.connection_index); |
| 1809 | if (PREDICT_FALSE (tc0 == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1810 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1811 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 1812 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1813 | } |
| 1814 | |
Ivan Shvedunov | 4beb1c6 | 2021-01-16 03:43:01 +0300 | [diff] [blame] | 1815 | /* Half-open completed or cancelled recently but the connection |
| 1816 | * was't removed yet by the owning thread */ |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1817 | if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) |
| 1818 | { |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1819 | error0 = TCP_ERROR_SPURIOUS_SYN_ACK; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1820 | goto drop; |
| 1821 | } |
| 1822 | |
| 1823 | ack0 = vnet_buffer (b0)->tcp.ack_number; |
| 1824 | seq0 = vnet_buffer (b0)->tcp.seq_number; |
| 1825 | tcp0 = tcp_buffer_hdr (b0); |
| 1826 | |
| 1827 | /* Crude check to see if the connection handle does not match |
| 1828 | * the packet. Probably connection just switched to established */ |
| 1829 | if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port |
| 1830 | || tcp0->src_port != tc0->c_rmt_port)) |
| 1831 | { |
| 1832 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 1833 | goto drop; |
| 1834 | } |
| 1835 | |
| 1836 | if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0) |
| 1837 | && !tcp_syn (tcp0))) |
| 1838 | { |
| 1839 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 1840 | goto drop; |
| 1841 | } |
| 1842 | |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 1843 | /* SYNs consume sequence numbers */ |
| 1844 | vnet_buffer (b0)->tcp.seq_end += tcp_is_syn (tcp0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1845 | |
| 1846 | /* |
| 1847 | * 1. check the ACK bit |
| 1848 | */ |
| 1849 | |
| 1850 | /* |
| 1851 | * If the ACK bit is set |
| 1852 | * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless |
| 1853 | * the RST bit is set, if so drop the segment and return) |
| 1854 | * <SEQ=SEG.ACK><CTL=RST> |
| 1855 | * and discard the segment. Return. |
| 1856 | * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. |
| 1857 | */ |
| 1858 | if (tcp_ack (tcp0)) |
| 1859 | { |
| 1860 | if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) |
| 1861 | { |
| 1862 | if (!tcp_rst (tcp0)) |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 1863 | tcp_send_reset_w_pkt (tc0, b0, my_thread_index, is_ip4); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1864 | error0 = TCP_ERROR_RCV_WND; |
| 1865 | goto drop; |
| 1866 | } |
| 1867 | |
| 1868 | /* Make sure ACK is valid */ |
| 1869 | if (seq_gt (tc0->snd_una, ack0)) |
| 1870 | { |
| 1871 | error0 = TCP_ERROR_ACK_INVALID; |
| 1872 | goto drop; |
| 1873 | } |
| 1874 | } |
| 1875 | |
| 1876 | /* |
| 1877 | * 2. check the RST bit |
| 1878 | */ |
| 1879 | |
| 1880 | if (tcp_rst (tcp0)) |
| 1881 | { |
| 1882 | /* If ACK is acceptable, signal client that peer is not |
| 1883 | * willing to accept connection and drop connection*/ |
| 1884 | if (tcp_ack (tcp0)) |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 1885 | tcp_rcv_rst (wrk, tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1886 | error0 = TCP_ERROR_RST_RCVD; |
| 1887 | goto drop; |
| 1888 | } |
| 1889 | |
| 1890 | /* |
| 1891 | * 3. check the security and precedence (skipped) |
| 1892 | */ |
| 1893 | |
| 1894 | /* |
| 1895 | * 4. check the SYN bit |
| 1896 | */ |
| 1897 | |
| 1898 | /* No SYN flag. Drop. */ |
| 1899 | if (!tcp_syn (tcp0)) |
| 1900 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1901 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 1902 | goto drop; |
| 1903 | } |
| 1904 | |
| 1905 | /* Parse options */ |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 1906 | if (tcp_options_parse (tcp0, &tc0->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1907 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1908 | error0 = TCP_ERROR_OPTIONS; |
| 1909 | goto drop; |
| 1910 | } |
| 1911 | |
| 1912 | /* Valid SYN or SYN-ACK. Move connection from half-open pool to |
| 1913 | * current thread pool. */ |
Florin Coras | 12f6936 | 2019-08-16 09:44:00 -0700 | [diff] [blame] | 1914 | new_tc0 = tcp_connection_alloc_w_base (my_thread_index, tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1915 | new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; |
| 1916 | new_tc0->irs = seq0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1917 | new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; |
| 1918 | new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; |
| 1919 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1920 | if (tcp_opts_tstamp (&new_tc0->rcv_opts)) |
| 1921 | { |
| 1922 | new_tc0->tsval_recent = new_tc0->rcv_opts.tsval; |
| 1923 | new_tc0->tsval_recent_age = tcp_time_now (); |
| 1924 | } |
| 1925 | |
| 1926 | if (tcp_opts_wscale (&new_tc0->rcv_opts)) |
| 1927 | new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 1928 | else |
| 1929 | new_tc0->rcv_wscale = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1930 | |
| 1931 | new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
| 1932 | << new_tc0->snd_wscale; |
| 1933 | new_tc0->snd_wl1 = seq0; |
| 1934 | new_tc0->snd_wl2 = ack0; |
| 1935 | |
| 1936 | tcp_connection_init_vars (new_tc0); |
| 1937 | |
| 1938 | /* SYN-ACK: See if we can switch to ESTABLISHED state */ |
| 1939 | if (PREDICT_TRUE (tcp_ack (tcp0))) |
| 1940 | { |
| 1941 | /* Our SYN is ACKed: we have iss < ack = snd_una */ |
| 1942 | |
| 1943 | /* TODO Dequeue acknowledged segments if we support Fast Open */ |
| 1944 | new_tc0->snd_una = ack0; |
| 1945 | new_tc0->state = TCP_STATE_ESTABLISHED; |
| 1946 | |
| 1947 | /* Make sure las is initialized for the wnd computation */ |
| 1948 | new_tc0->rcv_las = new_tc0->rcv_nxt; |
| 1949 | |
| 1950 | /* Notify app that we have connection. If session layer can't |
| 1951 | * allocate session send reset */ |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1952 | if (session_stream_connect_notify (&new_tc0->connection, |
| 1953 | SESSION_E_NONE)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1954 | { |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 1955 | tcp_send_reset_w_pkt (new_tc0, b0, my_thread_index, is_ip4); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1956 | tcp_connection_cleanup (new_tc0); |
Florin Coras | 718a055 | 2019-06-07 07:03:01 -0700 | [diff] [blame] | 1957 | error0 = TCP_ERROR_CREATE_SESSION_FAIL; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1958 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1959 | } |
| 1960 | |
Florin Coras | 8c4fa01 | 2020-11-06 16:59:08 -0800 | [diff] [blame] | 1961 | transport_fifos_init_ooo (&new_tc0->connection); |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 1962 | new_tc0->tx_fifo_size = |
| 1963 | transport_tx_fifo_size (&new_tc0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1964 | /* Update rtt with the syn-ack sample */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 1965 | tcp_estimate_initial_rtt (new_tc0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1966 | TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1967 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 1968 | } |
| 1969 | /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ |
| 1970 | else |
| 1971 | { |
| 1972 | new_tc0->state = TCP_STATE_SYN_RCVD; |
| 1973 | |
| 1974 | /* Notify app that we have connection */ |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1975 | if (session_stream_connect_notify (&new_tc0->connection, |
| 1976 | SESSION_E_NONE)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1977 | { |
| 1978 | tcp_connection_cleanup (new_tc0); |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 1979 | tcp_send_reset_w_pkt (tc0, b0, my_thread_index, is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1980 | TCP_EVT (TCP_EVT_RST_SENT, tc0); |
Florin Coras | 718a055 | 2019-06-07 07:03:01 -0700 | [diff] [blame] | 1981 | error0 = TCP_ERROR_CREATE_SESSION_FAIL; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1982 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1983 | } |
| 1984 | |
Florin Coras | 8c4fa01 | 2020-11-06 16:59:08 -0800 | [diff] [blame] | 1985 | transport_fifos_init_ooo (&new_tc0->connection); |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 1986 | new_tc0->tx_fifo_size = |
| 1987 | transport_tx_fifo_size (&new_tc0->connection); |
| 1988 | new_tc0->rtt_ts = 0; |
| 1989 | tcp_init_snd_vars (new_tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1990 | tcp_send_synack (new_tc0); |
| 1991 | error0 = TCP_ERROR_SYNS_RCVD; |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 1992 | goto cleanup_ho; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1993 | } |
| 1994 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1995 | if (!(new_tc0->cfg_flags & TCP_CFG_F_NO_TSO)) |
| 1996 | tcp_check_tx_offload (new_tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 1997 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1998 | /* Read data, if any */ |
| 1999 | if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) |
| 2000 | { |
| 2001 | clib_warning ("rcvd data in syn-sent"); |
| 2002 | error0 = tcp_segment_rcv (wrk, new_tc0, b0); |
| 2003 | if (error0 == TCP_ERROR_ACK_OK) |
| 2004 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 2005 | } |
| 2006 | else |
| 2007 | { |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 2008 | /* Send ack now instead of programming it because connection was |
| 2009 | * just established and it's not optional. */ |
| 2010 | tcp_send_ack (new_tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2011 | } |
| 2012 | |
Florin Coras | d50ff7f | 2020-04-16 04:30:22 +0000 | [diff] [blame] | 2013 | cleanup_ho: |
| 2014 | |
| 2015 | /* If this is not the owning thread, wait for syn retransmit to |
| 2016 | * expire and cleanup then */ |
| 2017 | if (tcp_half_open_connection_cleanup (tc0)) |
| 2018 | tc0->flags |= TCP_CONN_HALF_OPEN_DONE; |
| 2019 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2020 | drop: |
| 2021 | |
| 2022 | tcp_inc_counter (syn_sent, error0, 1); |
| 2023 | if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0)) |
| 2024 | { |
| 2025 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2026 | clib_memcpy_fast (&t0->tcp_header, tcp0, sizeof (t0->tcp_header)); |
| 2027 | clib_memcpy_fast (&t0->tcp_connection, tc0, |
| 2028 | sizeof (t0->tcp_connection)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2029 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2030 | } |
| 2031 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 2032 | errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 2033 | my_thread_index); |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2034 | tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2035 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
Florin Coras | 6939d5e | 2020-02-10 23:22:34 +0000 | [diff] [blame] | 2036 | tcp_handle_disconnects (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2037 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2038 | return from_frame->n_vectors; |
| 2039 | } |
| 2040 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2041 | VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm, |
| 2042 | vlib_node_runtime_t * node, |
| 2043 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2044 | { |
| 2045 | return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2046 | } |
| 2047 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2048 | VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm, |
| 2049 | vlib_node_runtime_t * node, |
| 2050 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2051 | { |
| 2052 | return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2053 | } |
| 2054 | |
| 2055 | /* *INDENT-OFF* */ |
| 2056 | VLIB_REGISTER_NODE (tcp4_syn_sent_node) = |
| 2057 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2058 | .name = "tcp4-syn-sent", |
| 2059 | /* Takes a vector of packets. */ |
| 2060 | .vector_size = sizeof (u32), |
| 2061 | .n_errors = TCP_N_ERROR, |
| 2062 | .error_strings = tcp_error_strings, |
| 2063 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2064 | .next_nodes = |
| 2065 | { |
| 2066 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2067 | foreach_tcp_state_next |
| 2068 | #undef _ |
| 2069 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2070 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2071 | }; |
| 2072 | /* *INDENT-ON* */ |
| 2073 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2074 | /* *INDENT-OFF* */ |
| 2075 | VLIB_REGISTER_NODE (tcp6_syn_sent_node) = |
| 2076 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2077 | .name = "tcp6-syn-sent", |
| 2078 | /* Takes a vector of packets. */ |
| 2079 | .vector_size = sizeof (u32), |
| 2080 | .n_errors = TCP_N_ERROR, |
| 2081 | .error_strings = tcp_error_strings, |
| 2082 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2083 | .next_nodes = |
| 2084 | { |
| 2085 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2086 | foreach_tcp_state_next |
| 2087 | #undef _ |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2088 | }, |
| 2089 | .format_trace = format_tcp_rx_trace_short, |
| 2090 | }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2091 | /* *INDENT-ON* */ |
| 2092 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2093 | /** |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2094 | * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2095 | * as per RFC793 p. 64 |
| 2096 | */ |
| 2097 | always_inline uword |
| 2098 | tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2099 | vlib_frame_t * from_frame, int is_ip4) |
| 2100 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2101 | u32 thread_index = vm->thread_index, errors = 0, *first_buffer; |
| 2102 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | 78cc4b0 | 2018-12-20 18:24:49 -0800 | [diff] [blame] | 2103 | u32 n_left_from, *from, max_dequeue; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2104 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2105 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2106 | n_left_from = from_frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2107 | |
| 2108 | while (n_left_from > 0) |
| 2109 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2110 | u32 bi0, error0 = TCP_ERROR_NONE; |
| 2111 | tcp_header_t *tcp0 = 0; |
| 2112 | tcp_connection_t *tc0; |
| 2113 | vlib_buffer_t *b0; |
| 2114 | u8 is_fin0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2115 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2116 | bi0 = from[0]; |
| 2117 | from += 1; |
| 2118 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2119 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2120 | b0 = vlib_get_buffer (vm, bi0); |
| 2121 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2122 | thread_index); |
| 2123 | if (PREDICT_FALSE (tc0 == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2124 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2125 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2126 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2127 | } |
| 2128 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2129 | tcp0 = tcp_buffer_hdr (b0); |
| 2130 | is_fin0 = tcp_is_fin (tcp0); |
| 2131 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2132 | if (CLIB_DEBUG) |
| 2133 | { |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2134 | if (!(tc0->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2135 | { |
Ryujiro Shibuya | c8be851 | 2019-10-28 00:32:12 +0000 | [diff] [blame] | 2136 | tcp_connection_t *tmp; |
| 2137 | tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index, |
| 2138 | is_ip4); |
| 2139 | if (tmp->state != tc0->state) |
| 2140 | { |
| 2141 | if (tc0->state != TCP_STATE_CLOSED) |
| 2142 | clib_warning ("state changed"); |
| 2143 | goto drop; |
| 2144 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2145 | } |
| 2146 | } |
| 2147 | |
| 2148 | /* |
| 2149 | * Special treatment for CLOSED |
| 2150 | */ |
| 2151 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 2152 | { |
| 2153 | error0 = TCP_ERROR_CONNECTION_CLOSED; |
| 2154 | goto drop; |
| 2155 | } |
| 2156 | |
| 2157 | /* |
| 2158 | * For all other states (except LISTEN) |
| 2159 | */ |
| 2160 | |
| 2161 | /* 1-4: check SEQ, RST, SYN */ |
| 2162 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, tcp0, &error0))) |
| 2163 | goto drop; |
| 2164 | |
| 2165 | /* 5: check the ACK field */ |
| 2166 | switch (tc0->state) |
| 2167 | { |
| 2168 | case TCP_STATE_SYN_RCVD: |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2169 | |
| 2170 | /* Make sure the segment is exactly right */ |
| 2171 | if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number || is_fin0) |
| 2172 | { |
Florin Coras | 4dc10a4 | 2020-02-11 05:31:49 +0000 | [diff] [blame] | 2173 | tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2174 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 2175 | goto drop; |
| 2176 | } |
| 2177 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2178 | /* |
| 2179 | * If the segment acknowledgment is not acceptable, form a |
| 2180 | * reset segment, |
| 2181 | * <SEQ=SEG.ACK><CTL=RST> |
| 2182 | * and send it. |
| 2183 | */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2184 | if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2185 | { |
Florin Coras | 4dc10a4 | 2020-02-11 05:31:49 +0000 | [diff] [blame] | 2186 | tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4); |
| 2187 | error0 = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 4850e3e | 2018-12-12 14:34:38 -0800 | [diff] [blame] | 2188 | goto drop; |
| 2189 | } |
| 2190 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2191 | /* Update rtt and rto */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2192 | tcp_estimate_initial_rtt (tc0); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2193 | tcp_connection_tx_pacer_update (tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2194 | |
| 2195 | /* Switch state to ESTABLISHED */ |
| 2196 | tc0->state = TCP_STATE_ESTABLISHED; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 2197 | TCP_EVT (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2198 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2199 | if (!(tc0->cfg_flags & TCP_CFG_F_NO_TSO)) |
| 2200 | tcp_check_tx_offload (tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2201 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2202 | /* Initialize session variables */ |
| 2203 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
| 2204 | tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
| 2205 | << tc0->rcv_opts.wscale; |
| 2206 | tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 2207 | tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
| 2208 | |
| 2209 | /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2210 | tcp_retransmit_timer_reset (&wrk->timer_wheel, tc0); |
Florin Coras | a27a46e | 2019-02-18 13:02:28 -0800 | [diff] [blame] | 2211 | if (session_stream_accept_notify (&tc0->connection)) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2212 | { |
| 2213 | error0 = TCP_ERROR_MSG_QUEUE_FULL; |
Florin Coras | 4dc10a4 | 2020-02-11 05:31:49 +0000 | [diff] [blame] | 2214 | tcp_send_reset (tc0); |
| 2215 | session_transport_delete_notify (&tc0->connection); |
| 2216 | tcp_connection_cleanup (tc0); |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2217 | goto drop; |
| 2218 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2219 | error0 = TCP_ERROR_ACK_OK; |
| 2220 | break; |
| 2221 | case TCP_STATE_ESTABLISHED: |
| 2222 | /* We can get packets in established state here because they |
| 2223 | * were enqueued before state change */ |
| 2224 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2225 | goto drop; |
| 2226 | |
| 2227 | break; |
| 2228 | case TCP_STATE_FIN_WAIT_1: |
| 2229 | /* In addition to the processing for the ESTABLISHED state, if |
| 2230 | * our FIN is now acknowledged then enter FIN-WAIT-2 and |
| 2231 | * continue processing in that state. */ |
| 2232 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2233 | goto drop; |
| 2234 | |
| 2235 | /* Still have to send the FIN */ |
| 2236 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2237 | { |
| 2238 | /* TX fifo finally drained */ |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 2239 | max_dequeue = transport_max_tx_dequeue (&tc0->connection); |
Florin Coras | 78cc4b0 | 2018-12-20 18:24:49 -0800 | [diff] [blame] | 2240 | if (max_dequeue <= tc0->burst_acked) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2241 | tcp_send_fin (tc0); |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2242 | /* If a fin was received and data was acked extend wait */ |
| 2243 | else if ((tc0->flags & TCP_CONN_FINRCVD) && tc0->bytes_acked) |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2244 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2245 | tcp_cfg.closewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2246 | } |
| 2247 | /* If FIN is ACKed */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 2248 | else if (tc0->snd_una == tc0->snd_nxt) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2249 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2250 | /* Stop all retransmit timers because we have nothing more |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2251 | * to send. */ |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2252 | tcp_connection_timers_reset (tc0); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2253 | |
| 2254 | /* We already have a FIN but didn't transition to CLOSING |
| 2255 | * because of outstanding tx data. Close the connection. */ |
| 2256 | if (tc0->flags & TCP_CONN_FINRCVD) |
| 2257 | { |
| 2258 | tcp_connection_set_state (tc0, TCP_STATE_CLOSED); |
Florin Coras | a0904f0 | 2019-07-22 20:55:11 -0700 | [diff] [blame] | 2259 | session_transport_closed_notify (&tc0->connection); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 2260 | tcp_program_cleanup (wrk, tc0); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2261 | goto drop; |
| 2262 | } |
| 2263 | |
| 2264 | tcp_connection_set_state (tc0, TCP_STATE_FIN_WAIT_2); |
| 2265 | /* Enable waitclose because we're willing to wait for peer's |
| 2266 | * FIN but not indefinitely. */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2267 | tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2268 | tcp_cfg.finwait2_time); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2269 | |
| 2270 | /* Don't try to deq the FIN acked */ |
| 2271 | if (tc0->burst_acked > 1) |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 2272 | session_tx_fifo_dequeue_drop (&tc0->connection, |
| 2273 | tc0->burst_acked - 1); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2274 | tc0->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2275 | } |
| 2276 | break; |
| 2277 | case TCP_STATE_FIN_WAIT_2: |
| 2278 | /* In addition to the processing for the ESTABLISHED state, if |
| 2279 | * the retransmission queue is empty, the user's CLOSE can be |
| 2280 | * acknowledged ("ok") but do not delete the TCB. */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2281 | if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2282 | goto drop; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2283 | tc0->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2284 | break; |
| 2285 | case TCP_STATE_CLOSE_WAIT: |
| 2286 | /* Do the same processing as for the ESTABLISHED state. */ |
| 2287 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2288 | goto drop; |
| 2289 | |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2290 | if (!(tc0->flags & TCP_CONN_FINPNDG)) |
| 2291 | break; |
| 2292 | |
| 2293 | /* Still have outstanding tx data */ |
Florin Coras | 182bbc1 | 2019-06-28 09:41:28 -0700 | [diff] [blame] | 2294 | max_dequeue = transport_max_tx_dequeue (&tc0->connection); |
| 2295 | if (max_dequeue > tc0->burst_acked) |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2296 | break; |
| 2297 | |
| 2298 | tcp_send_fin (tc0); |
| 2299 | tcp_connection_timers_reset (tc0); |
| 2300 | tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2301 | tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2302 | tcp_cfg.lastack_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2303 | break; |
| 2304 | case TCP_STATE_CLOSING: |
| 2305 | /* In addition to the processing for the ESTABLISHED state, if |
| 2306 | * the ACK acknowledges our FIN then enter the TIME-WAIT state, |
| 2307 | * otherwise ignore the segment. */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2308 | if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) |
| 2309 | goto drop; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 2310 | |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2311 | if (tc0->snd_una != tc0->snd_nxt) |
| 2312 | goto drop; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2313 | |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 2314 | tcp_connection_timers_reset (tc0); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2315 | tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2316 | tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2317 | tcp_cfg.timewait_time); |
Florin Coras | 692b949 | 2019-07-12 15:01:53 -0700 | [diff] [blame] | 2318 | session_transport_closed_notify (&tc0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2319 | goto drop; |
| 2320 | |
| 2321 | break; |
| 2322 | case TCP_STATE_LAST_ACK: |
| 2323 | /* The only thing that [should] arrive in this state is an |
| 2324 | * acknowledgment of our FIN. If our FIN is now acknowledged, |
| 2325 | * delete the TCB, enter the CLOSED state, and return. */ |
| 2326 | |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2327 | if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) |
| 2328 | goto drop; |
| 2329 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2330 | /* Apparently our ACK for the peer's FIN was lost */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 2331 | if (is_fin0 && tc0->snd_una != tc0->snd_nxt) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2332 | { |
| 2333 | tcp_send_fin (tc0); |
| 2334 | goto drop; |
| 2335 | } |
| 2336 | |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2337 | tcp_connection_set_state (tc0, TCP_STATE_CLOSED); |
Florin Coras | a0904f0 | 2019-07-22 20:55:11 -0700 | [diff] [blame] | 2338 | session_transport_closed_notify (&tc0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2339 | |
| 2340 | /* Don't free the connection from the data path since |
| 2341 | * we can't ensure that we have no packets already enqueued |
| 2342 | * to output. Rely instead on the waitclose timer */ |
| 2343 | tcp_connection_timers_reset (tc0); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 2344 | tcp_program_cleanup (tcp_get_worker (tc0->c_thread_index), tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2345 | |
| 2346 | goto drop; |
| 2347 | |
| 2348 | break; |
| 2349 | case TCP_STATE_TIME_WAIT: |
| 2350 | /* The only thing that can arrive in this state is a |
| 2351 | * retransmission of the remote FIN. Acknowledge it, and restart |
| 2352 | * the 2 MSL timeout. */ |
| 2353 | |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2354 | if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2355 | goto drop; |
| 2356 | |
Florin Coras | 37db430 | 2019-03-13 13:25:57 -0700 | [diff] [blame] | 2357 | if (!is_fin0) |
| 2358 | goto drop; |
| 2359 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2360 | tcp_program_ack (tc0); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2361 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2362 | tcp_cfg.timewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2363 | goto drop; |
| 2364 | |
| 2365 | break; |
| 2366 | default: |
| 2367 | ASSERT (0); |
| 2368 | } |
| 2369 | |
| 2370 | /* 6: check the URG bit TODO */ |
| 2371 | |
| 2372 | /* 7: process the segment text */ |
| 2373 | switch (tc0->state) |
| 2374 | { |
| 2375 | case TCP_STATE_ESTABLISHED: |
| 2376 | case TCP_STATE_FIN_WAIT_1: |
| 2377 | case TCP_STATE_FIN_WAIT_2: |
| 2378 | if (vnet_buffer (b0)->tcp.data_len) |
| 2379 | error0 = tcp_segment_rcv (wrk, tc0, b0); |
Florin Coras | c67724a | 2020-11-06 14:21:26 -0800 | [diff] [blame] | 2380 | /* Don't accept out of order fins lower */ |
| 2381 | if (vnet_buffer (b0)->tcp.seq_end != tc0->rcv_nxt) |
| 2382 | goto drop; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2383 | break; |
| 2384 | case TCP_STATE_CLOSE_WAIT: |
| 2385 | case TCP_STATE_CLOSING: |
| 2386 | case TCP_STATE_LAST_ACK: |
| 2387 | case TCP_STATE_TIME_WAIT: |
| 2388 | /* This should not occur, since a FIN has been received from the |
| 2389 | * remote side. Ignore the segment text. */ |
| 2390 | break; |
| 2391 | } |
| 2392 | |
| 2393 | /* 8: check the FIN bit */ |
| 2394 | if (!is_fin0) |
| 2395 | goto drop; |
| 2396 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 2397 | TCP_EVT (TCP_EVT_FIN_RCVD, tc0); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2398 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2399 | switch (tc0->state) |
| 2400 | { |
| 2401 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2402 | /* Account for the FIN and send ack */ |
| 2403 | tc0->rcv_nxt += 1; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2404 | tcp_program_ack (tc0); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2405 | tcp_connection_set_state (tc0, TCP_STATE_CLOSE_WAIT); |
| 2406 | tcp_program_disconnect (wrk, tc0); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2407 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2408 | tcp_cfg.closewait_time); |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 2409 | break; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2410 | case TCP_STATE_SYN_RCVD: |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 2411 | /* Send FIN-ACK, enter LAST-ACK and because the app was not |
| 2412 | * notified yet, set a cleanup timer instead of relying on |
| 2413 | * disconnect notify and the implicit close call. */ |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2414 | tcp_connection_timers_reset (tc0); |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 2415 | tc0->rcv_nxt += 1; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2416 | tcp_send_fin (tc0); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2417 | tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2418 | tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2419 | tcp_cfg.lastack_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2420 | break; |
| 2421 | case TCP_STATE_CLOSE_WAIT: |
| 2422 | case TCP_STATE_CLOSING: |
| 2423 | case TCP_STATE_LAST_ACK: |
| 2424 | /* move along .. */ |
| 2425 | break; |
| 2426 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2427 | tc0->rcv_nxt += 1; |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2428 | |
Florin Coras | 565115e | 2019-02-20 19:48:31 -0800 | [diff] [blame] | 2429 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2430 | { |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2431 | /* If data is outstanding, stay in FIN_WAIT_1 and try to finish |
| 2432 | * sending it. Since we already received a fin, do not wait |
| 2433 | * for too long. */ |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2434 | tc0->flags |= TCP_CONN_FINRCVD; |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2435 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2436 | tcp_cfg.closewait_time); |
Florin Coras | 565115e | 2019-02-20 19:48:31 -0800 | [diff] [blame] | 2437 | } |
| 2438 | else |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2439 | { |
| 2440 | tcp_connection_set_state (tc0, TCP_STATE_CLOSING); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2441 | tcp_program_ack (tc0); |
Florin Coras | 070fd4b | 2019-04-02 19:03:23 -0700 | [diff] [blame] | 2442 | /* Wait for ACK for our FIN but not forever */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2443 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 2444 | tcp_cfg.closing_time); |
Florin Coras | f65074e | 2019-03-31 17:17:11 -0700 | [diff] [blame] | 2445 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2446 | break; |
| 2447 | case TCP_STATE_FIN_WAIT_2: |
| 2448 | /* Got FIN, send ACK! Be more aggressive with resource cleanup */ |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 2449 | tc0->rcv_nxt += 1; |
| 2450 | tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2451 | tcp_connection_timers_reset (tc0); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2452 | tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2453 | tcp_cfg.timewait_time); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2454 | tcp_program_ack (tc0); |
Florin Coras | 692b949 | 2019-07-12 15:01:53 -0700 | [diff] [blame] | 2455 | session_transport_closed_notify (&tc0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2456 | break; |
| 2457 | case TCP_STATE_TIME_WAIT: |
| 2458 | /* Remain in the TIME-WAIT state. Restart the time-wait |
| 2459 | * timeout. |
| 2460 | */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 2461 | tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE, |
| 2462 | tcp_cfg.timewait_time); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2463 | break; |
| 2464 | } |
| 2465 | error0 = TCP_ERROR_FIN_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2466 | |
| 2467 | drop: |
| 2468 | |
| 2469 | tcp_inc_counter (rcv_process, error0, 1); |
| 2470 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2471 | { |
| 2472 | tcp_rx_trace_t *t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2473 | tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); |
| 2474 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2475 | } |
| 2476 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 2477 | errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 2478 | thread_index); |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2479 | tcp_inc_counter (rcv_process, TCP_ERROR_MSG_QUEUE_FULL, errors); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2480 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | 79fdfd6 | 2019-05-23 06:19:09 -0700 | [diff] [blame] | 2481 | tcp_handle_disconnects (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2482 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
| 2483 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2484 | return from_frame->n_vectors; |
| 2485 | } |
| 2486 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2487 | VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm, |
| 2488 | vlib_node_runtime_t * node, |
| 2489 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2490 | { |
| 2491 | return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2492 | } |
| 2493 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2494 | VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm, |
| 2495 | vlib_node_runtime_t * node, |
| 2496 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2497 | { |
| 2498 | return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2499 | } |
| 2500 | |
| 2501 | /* *INDENT-OFF* */ |
| 2502 | VLIB_REGISTER_NODE (tcp4_rcv_process_node) = |
| 2503 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2504 | .name = "tcp4-rcv-process", |
| 2505 | /* Takes a vector of packets. */ |
| 2506 | .vector_size = sizeof (u32), |
| 2507 | .n_errors = TCP_N_ERROR, |
| 2508 | .error_strings = tcp_error_strings, |
| 2509 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2510 | .next_nodes = |
| 2511 | { |
| 2512 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2513 | foreach_tcp_state_next |
| 2514 | #undef _ |
| 2515 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2516 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2517 | }; |
| 2518 | /* *INDENT-ON* */ |
| 2519 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2520 | /* *INDENT-OFF* */ |
| 2521 | VLIB_REGISTER_NODE (tcp6_rcv_process_node) = |
| 2522 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2523 | .name = "tcp6-rcv-process", |
| 2524 | /* Takes a vector of packets. */ |
| 2525 | .vector_size = sizeof (u32), |
| 2526 | .n_errors = TCP_N_ERROR, |
| 2527 | .error_strings = tcp_error_strings, |
| 2528 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2529 | .next_nodes = |
| 2530 | { |
| 2531 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2532 | foreach_tcp_state_next |
| 2533 | #undef _ |
| 2534 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2535 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2536 | }; |
| 2537 | /* *INDENT-ON* */ |
| 2538 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2539 | /** |
| 2540 | * LISTEN state processing as per RFC 793 p. 65 |
| 2541 | */ |
| 2542 | always_inline uword |
| 2543 | tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2544 | vlib_frame_t * from_frame, int is_ip4) |
| 2545 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2546 | u32 n_left_from, *from, n_syns = 0, *first_buffer; |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2547 | u32 thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2548 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2549 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2550 | n_left_from = from_frame->n_vectors; |
| 2551 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2552 | while (n_left_from > 0) |
| 2553 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2554 | u32 bi, error = TCP_ERROR_NONE; |
| 2555 | tcp_connection_t *lc, *child; |
| 2556 | vlib_buffer_t *b; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2557 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2558 | bi = from[0]; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2559 | from += 1; |
| 2560 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2561 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2562 | b = vlib_get_buffer (vm, bi); |
Florin Coras | de7fcac | 2020-01-16 04:04:54 +0000 | [diff] [blame] | 2563 | |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2564 | /* Flags initialized with connection state after lookup */ |
| 2565 | if (vnet_buffer (b)->tcp.flags == TCP_STATE_LISTEN) |
| 2566 | { |
| 2567 | lc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index); |
| 2568 | } |
| 2569 | else |
Florin Coras | de7fcac | 2020-01-16 04:04:54 +0000 | [diff] [blame] | 2570 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2571 | tcp_connection_t *tc; |
| 2572 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2573 | thread_index); |
| 2574 | if (tc->state != TCP_STATE_TIME_WAIT) |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2575 | { |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2576 | lc = 0; |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2577 | error = TCP_ERROR_CREATE_EXISTS; |
| 2578 | goto done; |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2579 | } |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2580 | lc = tcp_lookup_listener (b, tc->c_fib_index, is_ip4); |
Florin Coras | b7f035f | 2019-12-27 09:27:52 -0800 | [diff] [blame] | 2581 | /* clean up the old session */ |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2582 | tcp_connection_del (tc); |
Florin Coras | 355791c | 2020-10-11 11:20:56 -0700 | [diff] [blame] | 2583 | /* listener was cleaned up */ |
| 2584 | if (!lc) |
| 2585 | { |
| 2586 | error = TCP_ERROR_NO_LISTENER; |
| 2587 | goto done; |
| 2588 | } |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2589 | } |
| 2590 | |
| 2591 | /* Make sure connection wasn't just created */ |
| 2592 | child = tcp_lookup_connection (lc->c_fib_index, b, thread_index, |
| 2593 | is_ip4); |
| 2594 | if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN)) |
| 2595 | { |
| 2596 | error = TCP_ERROR_CREATE_EXISTS; |
| 2597 | goto done; |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 2598 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2599 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2600 | /* Create child session. For syn-flood protection use filter */ |
| 2601 | |
| 2602 | /* 1. first check for an RST: handled in dispatch */ |
| 2603 | /* if (tcp_rst (th0)) |
| 2604 | goto drop; |
| 2605 | */ |
| 2606 | |
| 2607 | /* 2. second check for an ACK: handled in dispatch */ |
| 2608 | /* if (tcp_ack (th0)) |
| 2609 | { |
| 2610 | tcp_send_reset (b0, is_ip4); |
| 2611 | goto drop; |
| 2612 | } |
| 2613 | */ |
| 2614 | |
| 2615 | /* 3. check for a SYN (did that already) */ |
| 2616 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2617 | /* Create child session and send SYN-ACK */ |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2618 | child = tcp_connection_alloc (thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2619 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2620 | if (tcp_options_parse (tcp_buffer_hdr (b), &child->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2621 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2622 | error = TCP_ERROR_OPTIONS; |
| 2623 | tcp_connection_free (child); |
| 2624 | goto done; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2625 | } |
| 2626 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2627 | tcp_init_w_buffer (child, b, is_ip4); |
| 2628 | |
| 2629 | child->state = TCP_STATE_SYN_RCVD; |
| 2630 | child->c_fib_index = lc->c_fib_index; |
| 2631 | child->cc_algo = lc->cc_algo; |
| 2632 | tcp_connection_init_vars (child); |
| 2633 | child->rto = TCP_RTO_MIN; |
| 2634 | |
Ivan Shvedunov | 9fefa89 | 2020-07-27 19:59:38 +0300 | [diff] [blame] | 2635 | /* |
| 2636 | * This initializes elog track, must be done before synack. |
| 2637 | * We also do it before possible tcp_connection_cleanup() as it |
| 2638 | * generates TCP_EVT_DELETE event. |
| 2639 | */ |
| 2640 | TCP_EVT (TCP_EVT_SYN_RCVD, child, 1); |
| 2641 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2642 | if (session_stream_accept (&child->connection, lc->c_s_index, |
| 2643 | lc->c_thread_index, 0 /* notify */ )) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2644 | { |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2645 | tcp_connection_cleanup (child); |
| 2646 | error = TCP_ERROR_CREATE_SESSION_FAIL; |
| 2647 | goto done; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2648 | } |
| 2649 | |
Florin Coras | 8c4fa01 | 2020-11-06 16:59:08 -0800 | [diff] [blame] | 2650 | transport_fifos_init_ooo (&child->connection); |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2651 | child->tx_fifo_size = transport_tx_fifo_size (&child->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2652 | |
Florin Coras | d2f5174 | 2020-07-24 09:49:46 -0700 | [diff] [blame] | 2653 | tcp_send_synack (child); |
| 2654 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2655 | done: |
| 2656 | |
| 2657 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2658 | { |
Florin Coras | d1b423c | 2020-10-12 19:03:52 -0700 | [diff] [blame] | 2659 | tcp_rx_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t)); |
| 2660 | tcp_set_rx_trace_data (t, lc, tcp_buffer_hdr (b), b, is_ip4); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2661 | } |
| 2662 | |
Florin Coras | 27bb99e | 2020-03-17 17:09:12 +0000 | [diff] [blame] | 2663 | n_syns += (error == TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2664 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2665 | |
| 2666 | tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2667 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
| 2668 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2669 | return from_frame->n_vectors; |
| 2670 | } |
| 2671 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2672 | VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2673 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2674 | { |
| 2675 | return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2676 | } |
| 2677 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2678 | VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2679 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2680 | { |
| 2681 | return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2682 | } |
| 2683 | |
| 2684 | /* *INDENT-OFF* */ |
| 2685 | VLIB_REGISTER_NODE (tcp4_listen_node) = |
| 2686 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2687 | .name = "tcp4-listen", |
| 2688 | /* Takes a vector of packets. */ |
| 2689 | .vector_size = sizeof (u32), |
| 2690 | .n_errors = TCP_N_ERROR, |
| 2691 | .error_strings = tcp_error_strings, |
| 2692 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 2693 | .next_nodes = |
| 2694 | { |
| 2695 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 2696 | foreach_tcp_state_next |
| 2697 | #undef _ |
| 2698 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2699 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2700 | }; |
| 2701 | /* *INDENT-ON* */ |
| 2702 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2703 | /* *INDENT-OFF* */ |
| 2704 | VLIB_REGISTER_NODE (tcp6_listen_node) = |
| 2705 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2706 | .name = "tcp6-listen", |
| 2707 | /* Takes a vector of packets. */ |
| 2708 | .vector_size = sizeof (u32), |
| 2709 | .n_errors = TCP_N_ERROR, |
| 2710 | .error_strings = tcp_error_strings, |
| 2711 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 2712 | .next_nodes = |
| 2713 | { |
| 2714 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 2715 | foreach_tcp_state_next |
| 2716 | #undef _ |
| 2717 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2718 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2719 | }; |
| 2720 | /* *INDENT-ON* */ |
| 2721 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2722 | typedef enum _tcp_input_next |
| 2723 | { |
| 2724 | TCP_INPUT_NEXT_DROP, |
| 2725 | TCP_INPUT_NEXT_LISTEN, |
| 2726 | TCP_INPUT_NEXT_RCV_PROCESS, |
| 2727 | TCP_INPUT_NEXT_SYN_SENT, |
| 2728 | TCP_INPUT_NEXT_ESTABLISHED, |
| 2729 | TCP_INPUT_NEXT_RESET, |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2730 | TCP_INPUT_NEXT_PUNT, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2731 | TCP_INPUT_N_NEXT |
| 2732 | } tcp_input_next_t; |
| 2733 | |
| 2734 | #define foreach_tcp4_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2735 | _ (DROP, "ip4-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2736 | _ (LISTEN, "tcp4-listen") \ |
| 2737 | _ (RCV_PROCESS, "tcp4-rcv-process") \ |
| 2738 | _ (SYN_SENT, "tcp4-syn-sent") \ |
| 2739 | _ (ESTABLISHED, "tcp4-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2740 | _ (RESET, "tcp4-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2741 | _ (PUNT, "ip4-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2742 | |
| 2743 | #define foreach_tcp6_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2744 | _ (DROP, "ip6-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2745 | _ (LISTEN, "tcp6-listen") \ |
| 2746 | _ (RCV_PROCESS, "tcp6-rcv-process") \ |
| 2747 | _ (SYN_SENT, "tcp6-syn-sent") \ |
| 2748 | _ (ESTABLISHED, "tcp6-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2749 | _ (RESET, "tcp6-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2750 | _ (PUNT, "ip6-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2751 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2752 | #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) |
| 2753 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2754 | static void |
| 2755 | tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2756 | vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2757 | { |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2758 | tcp_connection_t *tc; |
| 2759 | tcp_header_t *tcp; |
| 2760 | tcp_rx_trace_t *t; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2761 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2762 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2763 | for (i = 0; i < n_bufs; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2764 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2765 | if (bs[i]->flags & VLIB_BUFFER_IS_TRACED) |
| 2766 | { |
| 2767 | t = vlib_add_trace (vm, node, bs[i], sizeof (*t)); |
| 2768 | tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index, |
| 2769 | vm->thread_index); |
| 2770 | tcp = vlib_buffer_get_current (bs[i]); |
| 2771 | tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4); |
| 2772 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2773 | } |
| 2774 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2775 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2776 | static void |
| 2777 | tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) |
| 2778 | { |
Florin Coras | b5e55a2 | 2019-01-10 12:42:47 -0800 | [diff] [blame] | 2779 | if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2780 | { |
| 2781 | *next = TCP_INPUT_NEXT_DROP; |
| 2782 | } |
| 2783 | else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6)) |
| 2784 | { |
| 2785 | *next = TCP_INPUT_NEXT_PUNT; |
| 2786 | *error = TCP_ERROR_PUNT; |
| 2787 | } |
| 2788 | else |
| 2789 | { |
| 2790 | *next = TCP_INPUT_NEXT_RESET; |
| 2791 | *error = TCP_ERROR_NO_LISTENER; |
| 2792 | } |
| 2793 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2794 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2795 | static inline void |
| 2796 | tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc, |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2797 | vlib_buffer_t * b, u16 * next, |
| 2798 | vlib_node_runtime_t * error_node) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2799 | { |
| 2800 | tcp_header_t *tcp; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2801 | u32 error; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2802 | u8 flags; |
| 2803 | |
| 2804 | tcp = tcp_buffer_hdr (b); |
| 2805 | flags = tcp->flags & filter_flags; |
| 2806 | *next = tm->dispatch_table[tc->state][flags].next; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2807 | error = tm->dispatch_table[tc->state][flags].error; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2808 | tc->segs_in += 1; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2809 | |
Florin Coras | ee1cb46 | 2020-12-29 09:42:58 -0800 | [diff] [blame] | 2810 | /* Track connection state when packet was received. It helps |
| 2811 | * @ref tcp46_listen_inline detect port reuse */ |
| 2812 | vnet_buffer (b)->tcp.flags = tc->state; |
| 2813 | |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2814 | if (PREDICT_FALSE (error != TCP_ERROR_NONE)) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2815 | { |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2816 | b->error = error_node->errors[error]; |
| 2817 | if (error == TCP_ERROR_DISPATCH) |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2818 | clib_warning ("tcp conn %u disp error state %U flags %U", |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2819 | tc->c_c_index, format_tcp_state, tc->state, |
Florin Coras | a9d5bea | 2018-12-17 08:24:19 -0800 | [diff] [blame] | 2820 | format_tcp_flags, (int) flags); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2821 | } |
| 2822 | } |
| 2823 | |
| 2824 | always_inline uword |
| 2825 | tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2826 | vlib_frame_t * frame, int is_ip4, u8 is_nolookup) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2827 | { |
| 2828 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2829 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 2830 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2831 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 2832 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2833 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2834 | |
| 2835 | from = vlib_frame_vector_args (frame); |
| 2836 | n_left_from = frame->n_vectors; |
| 2837 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2838 | |
| 2839 | b = bufs; |
| 2840 | next = nexts; |
| 2841 | |
| 2842 | while (n_left_from >= 4) |
| 2843 | { |
| 2844 | u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER; |
| 2845 | tcp_connection_t *tc0, *tc1; |
| 2846 | |
| 2847 | { |
| 2848 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2849 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2850 | |
| 2851 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2852 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2853 | } |
| 2854 | |
| 2855 | next[0] = next[1] = TCP_INPUT_NEXT_DROP; |
| 2856 | |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2857 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4, |
| 2858 | is_nolookup); |
| 2859 | tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4, |
| 2860 | is_nolookup); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2861 | |
| 2862 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 2863 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2864 | ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))); |
| 2865 | 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] | 2866 | |
| 2867 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 2868 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 2869 | |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2870 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); |
| 2871 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2872 | } |
| 2873 | else |
| 2874 | { |
| 2875 | if (PREDICT_TRUE (tc0 != 0)) |
| 2876 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2877 | 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] | 2878 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2879 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2880 | } |
| 2881 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2882 | { |
| 2883 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2884 | b[0]->error = node->errors[error0]; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2885 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2886 | |
| 2887 | if (PREDICT_TRUE (tc1 != 0)) |
| 2888 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2889 | 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] | 2890 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2891 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2892 | } |
| 2893 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2894 | { |
| 2895 | tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2896 | b[1]->error = node->errors[error1]; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2897 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2898 | } |
| 2899 | |
| 2900 | b += 2; |
| 2901 | next += 2; |
| 2902 | n_left_from -= 2; |
| 2903 | } |
| 2904 | while (n_left_from > 0) |
| 2905 | { |
| 2906 | tcp_connection_t *tc0; |
| 2907 | u32 error0 = TCP_ERROR_NO_LISTENER; |
| 2908 | |
| 2909 | if (n_left_from > 1) |
| 2910 | { |
| 2911 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2912 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2913 | } |
| 2914 | |
| 2915 | next[0] = TCP_INPUT_NEXT_DROP; |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2916 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4, |
| 2917 | is_nolookup); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2918 | if (PREDICT_TRUE (tc0 != 0)) |
| 2919 | { |
Srikanth Akula | cf4c210 | 2019-11-06 18:53:13 -0800 | [diff] [blame] | 2920 | 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] | 2921 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2922 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2923 | } |
| 2924 | else |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2925 | { |
| 2926 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2927 | b[0]->error = node->errors[error0]; |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 2928 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 2929 | |
| 2930 | b += 1; |
| 2931 | next += 1; |
| 2932 | n_left_from -= 1; |
| 2933 | } |
| 2934 | |
| 2935 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2936 | tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4); |
| 2937 | |
| 2938 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 2939 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2940 | } |
| 2941 | |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 2942 | VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm, |
| 2943 | vlib_node_runtime_t * node, |
| 2944 | vlib_frame_t * from_frame) |
| 2945 | { |
| 2946 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ , |
| 2947 | 1 /* is_nolookup */ ); |
| 2948 | } |
| 2949 | |
| 2950 | VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm, |
| 2951 | vlib_node_runtime_t * node, |
| 2952 | vlib_frame_t * from_frame) |
| 2953 | { |
| 2954 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ , |
| 2955 | 1 /* is_nolookup */ ); |
| 2956 | } |
| 2957 | |
| 2958 | /* *INDENT-OFF* */ |
| 2959 | VLIB_REGISTER_NODE (tcp4_input_nolookup_node) = |
| 2960 | { |
| 2961 | .name = "tcp4-input-nolookup", |
| 2962 | /* Takes a vector of packets. */ |
| 2963 | .vector_size = sizeof (u32), |
| 2964 | .n_errors = TCP_N_ERROR, |
| 2965 | .error_strings = tcp_error_strings, |
| 2966 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 2967 | .next_nodes = |
| 2968 | { |
| 2969 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 2970 | foreach_tcp4_input_next |
| 2971 | #undef _ |
| 2972 | }, |
| 2973 | .format_buffer = format_tcp_header, |
| 2974 | .format_trace = format_tcp_rx_trace, |
| 2975 | }; |
| 2976 | /* *INDENT-ON* */ |
| 2977 | |
| 2978 | /* *INDENT-OFF* */ |
| 2979 | VLIB_REGISTER_NODE (tcp6_input_nolookup_node) = |
| 2980 | { |
| 2981 | .name = "tcp6-input-nolookup", |
| 2982 | /* Takes a vector of packets. */ |
| 2983 | .vector_size = sizeof (u32), |
| 2984 | .n_errors = TCP_N_ERROR, |
| 2985 | .error_strings = tcp_error_strings, |
| 2986 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 2987 | .next_nodes = |
| 2988 | { |
| 2989 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 2990 | foreach_tcp6_input_next |
| 2991 | #undef _ |
| 2992 | }, |
| 2993 | .format_buffer = format_tcp_header, |
| 2994 | .format_trace = format_tcp_rx_trace, |
| 2995 | }; |
| 2996 | /* *INDENT-ON* */ |
| 2997 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2998 | VLIB_NODE_FN (tcp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2999 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3000 | { |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 3001 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ , |
| 3002 | 0 /* is_nolookup */ ); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3003 | } |
| 3004 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 3005 | VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3006 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3007 | { |
Vladimir Kropylev | 456d2f9 | 2019-07-16 21:22:29 +0300 | [diff] [blame] | 3008 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ , |
| 3009 | 0 /* is_nolookup */ ); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3010 | } |
| 3011 | |
| 3012 | /* *INDENT-OFF* */ |
| 3013 | VLIB_REGISTER_NODE (tcp4_input_node) = |
| 3014 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3015 | .name = "tcp4-input", |
| 3016 | /* Takes a vector of packets. */ |
| 3017 | .vector_size = sizeof (u32), |
| 3018 | .n_errors = TCP_N_ERROR, |
| 3019 | .error_strings = tcp_error_strings, |
| 3020 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3021 | .next_nodes = |
| 3022 | { |
| 3023 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3024 | foreach_tcp4_input_next |
| 3025 | #undef _ |
| 3026 | }, |
| 3027 | .format_buffer = format_tcp_header, |
| 3028 | .format_trace = format_tcp_rx_trace, |
| 3029 | }; |
| 3030 | /* *INDENT-ON* */ |
| 3031 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3032 | /* *INDENT-OFF* */ |
| 3033 | VLIB_REGISTER_NODE (tcp6_input_node) = |
| 3034 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3035 | .name = "tcp6-input", |
| 3036 | /* Takes a vector of packets. */ |
| 3037 | .vector_size = sizeof (u32), |
| 3038 | .n_errors = TCP_N_ERROR, |
| 3039 | .error_strings = tcp_error_strings, |
| 3040 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3041 | .next_nodes = |
| 3042 | { |
| 3043 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3044 | foreach_tcp6_input_next |
| 3045 | #undef _ |
| 3046 | }, |
| 3047 | .format_buffer = format_tcp_header, |
| 3048 | .format_trace = format_tcp_rx_trace, |
| 3049 | }; |
| 3050 | /* *INDENT-ON* */ |
| 3051 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 3052 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3053 | static void |
| 3054 | tcp_dispatch_table_init (tcp_main_t * tm) |
| 3055 | { |
| 3056 | int i, j; |
| 3057 | for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++) |
| 3058 | for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++) |
| 3059 | { |
| 3060 | tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP; |
| 3061 | tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH; |
| 3062 | } |
| 3063 | |
| 3064 | #define _(t,f,n,e) \ |
| 3065 | do { \ |
| 3066 | tm->dispatch_table[TCP_STATE_##t][f].next = (n); \ |
| 3067 | tm->dispatch_table[TCP_STATE_##t][f].error = (e); \ |
| 3068 | } while (0) |
| 3069 | |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3070 | /* RFC 793: In LISTEN if RST drop and if ACK return RST */ |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 3071 | _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3072 | _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID); |
| 3073 | _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3074 | _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3075 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
| 3076 | TCP_ERROR_ACK_INVALID); |
| 3077 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3078 | TCP_ERROR_SEGMENT_INVALID); |
| 3079 | _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3080 | TCP_ERROR_SEGMENT_INVALID); |
| 3081 | _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3082 | TCP_ERROR_INVALID_CONNECTION); |
| 3083 | _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3084 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3085 | TCP_ERROR_SEGMENT_INVALID); |
| 3086 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3087 | TCP_ERROR_SEGMENT_INVALID); |
| 3088 | _(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] | 3089 | TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3090 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP, |
| 3091 | TCP_ERROR_SEGMENT_INVALID); |
| 3092 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
| 3093 | TCP_ERROR_SEGMENT_INVALID); |
| 3094 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, |
| 3095 | TCP_ERROR_SEGMENT_INVALID); |
| 3096 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3097 | TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3098 | /* ACK for for a SYN-ACK -> tcp-rcv-process. */ |
| 3099 | _(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] | 3100 | _(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] | 3101 | _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3102 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3103 | _(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] | 3104 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3105 | TCP_ERROR_NONE); |
| 3106 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3107 | TCP_ERROR_NONE); |
| 3108 | _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3109 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3110 | _(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] | 3111 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3112 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3113 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3114 | TCP_ERROR_NONE); |
| 3115 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3116 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3117 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3118 | TCP_ERROR_NONE); |
| 3119 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3120 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3121 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3122 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3123 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3124 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3125 | _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3126 | /* SYN-ACK for a SYN */ |
| 3127 | _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3128 | TCP_ERROR_NONE); |
| 3129 | _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3130 | _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3131 | _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3132 | TCP_ERROR_NONE); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 3133 | _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3134 | _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3135 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3136 | /* ACK for for established connection -> tcp-established. */ |
| 3137 | _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3138 | /* FIN for for established connection -> tcp-established. */ |
| 3139 | _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3140 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3141 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3142 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, |
| 3143 | TCP_ERROR_NONE); |
| 3144 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3145 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3146 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, |
| 3147 | TCP_ERROR_NONE); |
| 3148 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3149 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3150 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3151 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3152 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3153 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 3154 | _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3155 | _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3156 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3157 | _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3158 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3159 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3160 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, |
| 3161 | TCP_ERROR_NONE); |
| 3162 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3163 | TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3164 | _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3165 | /* ACK or FIN-ACK to our FIN */ |
| 3166 | _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3167 | _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3168 | TCP_ERROR_NONE); |
| 3169 | /* FIN in reply to our FIN from the other side */ |
Florin Coras | 76bc130 | 2018-12-23 23:36:36 -0800 | [diff] [blame] | 3170 | _(FIN_WAIT_1, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3171 | _(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] | 3172 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3173 | TCP_ERROR_NONE); |
| 3174 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3175 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3176 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3177 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3178 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3179 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3180 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3181 | TCP_ERROR_NONE); |
| 3182 | _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3183 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 5c0f166 | 2018-12-19 01:38:57 -0800 | [diff] [blame] | 3184 | _(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] | 3185 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3186 | TCP_ERROR_NONE); |
| 3187 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3188 | TCP_ERROR_NONE); |
| 3189 | _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3190 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3191 | _(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] | 3192 | _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3193 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3194 | _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Florin Coras | 5631893 | 2018-05-23 20:44:12 -0700 | [diff] [blame] | 3195 | _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 3196 | _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3197 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3198 | TCP_ERROR_NONE); |
| 3199 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3200 | TCP_ERROR_NONE); |
| 3201 | _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3202 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 3203 | _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3204 | _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3205 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3206 | _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 3c514d5 | 2018-12-22 11:39:33 -0800 | [diff] [blame] | 3207 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3208 | TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3209 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3210 | TCP_ERROR_NONE); |
| 3211 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3212 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3213 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3214 | TCP_ERROR_NONE); |
| 3215 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3216 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 79c04d6 | 2019-08-11 19:49:05 -0700 | [diff] [blame] | 3217 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3218 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | b56fcf1 | 2019-01-02 10:10:08 -0800 | [diff] [blame] | 3219 | _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3220 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3221 | /* FIN confirming that the peer (app) has closed */ |
| 3222 | _(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] | 3223 | _(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] | 3224 | _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3225 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3226 | _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3227 | _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3228 | TCP_ERROR_NONE); |
Florin Coras | f9512bf | 2020-07-29 10:13:07 -0700 | [diff] [blame] | 3229 | _(FIN_WAIT_2, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3230 | _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3231 | _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3232 | TCP_ERROR_NONE); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3233 | _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3234 | _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3235 | TCP_ERROR_NONE); |
Florin Coras | d75213f | 2020-07-28 10:57:09 -0700 | [diff] [blame] | 3236 | _(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] | 3237 | _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3238 | _(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] | 3239 | _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3240 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3241 | TCP_ERROR_NONE); |
Florin Coras | d12ff50 | 2018-12-25 10:55:01 -0800 | [diff] [blame] | 3242 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3243 | TCP_ERROR_NONE); |
| 3244 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, |
| 3245 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3246 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3247 | TCP_ERROR_NONE); |
| 3248 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3249 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3250 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, |
| 3251 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3252 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3253 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3254 | _(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] | 3255 | _(LAST_ACK, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3256 | TCP_ERROR_NONE); |
Florin Coras | c01d578 | 2018-10-17 14:53:11 -0700 | [diff] [blame] | 3257 | _(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] | 3258 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3259 | TCP_ERROR_NONE); |
| 3260 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3261 | TCP_ERROR_NONE); |
| 3262 | _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, |
| 3263 | TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Yu Ping | b092b77 | 2019-12-27 04:04:33 +0800 | [diff] [blame] | 3264 | _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3265 | _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3266 | _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3267 | TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3268 | _(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] | 3269 | _(TIME_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3270 | TCP_ERROR_NONE); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 3271 | _(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] | 3272 | /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An |
| 3273 | * incoming segment not containing a RST causes a RST to be sent in |
| 3274 | * response.*/ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3275 | _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3276 | _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3277 | TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 3278 | _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); |
| 3279 | _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 678a657 | 2018-12-17 21:31:25 -0800 | [diff] [blame] | 3280 | _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
Florin Coras | deb6f78 | 2020-02-11 02:42:36 +0000 | [diff] [blame] | 3281 | TCP_ERROR_CONNECTION_CLOSED); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3282 | #undef _ |
| 3283 | } |
| 3284 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 3285 | static clib_error_t * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3286 | tcp_input_init (vlib_main_t * vm) |
| 3287 | { |
| 3288 | clib_error_t *error = 0; |
| 3289 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3290 | |
| 3291 | if ((error = vlib_call_init_function (vm, tcp_init))) |
| 3292 | return error; |
| 3293 | |
| 3294 | /* Initialize dispatch table. */ |
| 3295 | tcp_dispatch_table_init (tm); |
| 3296 | |
| 3297 | return error; |
| 3298 | } |
| 3299 | |
| 3300 | VLIB_INIT_FUNCTION (tcp_input_init); |
| 3301 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 3302 | #endif /* CLIB_MARCH_VARIANT */ |
| 3303 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3304 | /* |
| 3305 | * fd.io coding-style-patch-verification: ON |
| 3306 | * |
| 3307 | * Local Variables: |
| 3308 | * eval: (c-set-style "gnu") |
| 3309 | * End: |
| 3310 | */ |