Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Cisco and/or its affiliates. |
| 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> |
| 17 | #include <vnet/tcp/tcp_packet.h> |
| 18 | #include <vnet/tcp/tcp.h> |
| 19 | #include <vnet/session/session.h> |
| 20 | #include <math.h> |
| 21 | |
| 22 | static char *tcp_error_strings[] = { |
| 23 | #define tcp_error(n,s) s, |
| 24 | #include <vnet/tcp/tcp_error.def> |
| 25 | #undef tcp_error |
| 26 | }; |
| 27 | |
| 28 | /* All TCP nodes have the same outgoing arcs */ |
| 29 | #define foreach_tcp_state_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 30 | _ (DROP4, "ip4-drop") \ |
| 31 | _ (DROP6, "ip6-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 32 | _ (TCP4_OUTPUT, "tcp4-output") \ |
| 33 | _ (TCP6_OUTPUT, "tcp6-output") |
| 34 | |
| 35 | typedef enum _tcp_established_next |
| 36 | { |
| 37 | #define _(s,n) TCP_ESTABLISHED_NEXT_##s, |
| 38 | foreach_tcp_state_next |
| 39 | #undef _ |
| 40 | TCP_ESTABLISHED_N_NEXT, |
| 41 | } tcp_established_next_t; |
| 42 | |
| 43 | typedef enum _tcp_rcv_process_next |
| 44 | { |
| 45 | #define _(s,n) TCP_RCV_PROCESS_NEXT_##s, |
| 46 | foreach_tcp_state_next |
| 47 | #undef _ |
| 48 | TCP_RCV_PROCESS_N_NEXT, |
| 49 | } tcp_rcv_process_next_t; |
| 50 | |
| 51 | typedef enum _tcp_syn_sent_next |
| 52 | { |
| 53 | #define _(s,n) TCP_SYN_SENT_NEXT_##s, |
| 54 | foreach_tcp_state_next |
| 55 | #undef _ |
| 56 | TCP_SYN_SENT_N_NEXT, |
| 57 | } tcp_syn_sent_next_t; |
| 58 | |
| 59 | typedef enum _tcp_listen_next |
| 60 | { |
| 61 | #define _(s,n) TCP_LISTEN_NEXT_##s, |
| 62 | foreach_tcp_state_next |
| 63 | #undef _ |
| 64 | TCP_LISTEN_N_NEXT, |
| 65 | } tcp_listen_next_t; |
| 66 | |
| 67 | /* Generic, state independent indices */ |
| 68 | typedef enum _tcp_state_next |
| 69 | { |
| 70 | #define _(s,n) TCP_NEXT_##s, |
| 71 | foreach_tcp_state_next |
| 72 | #undef _ |
| 73 | TCP_STATE_N_NEXT, |
| 74 | } tcp_state_next_t; |
| 75 | |
| 76 | #define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \ |
| 77 | : TCP_NEXT_TCP6_OUTPUT) |
| 78 | |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 79 | #define tcp_next_drop(is_ip4) (is_ip4 ? TCP_NEXT_DROP4 \ |
| 80 | : TCP_NEXT_DROP6) |
| 81 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 82 | vlib_node_registration_t tcp4_established_node; |
| 83 | vlib_node_registration_t tcp6_established_node; |
| 84 | |
| 85 | /** |
| 86 | * Validate segment sequence number. As per RFC793: |
| 87 | * |
| 88 | * Segment Receive Test |
| 89 | * Length Window |
| 90 | * ------- ------- ------------------------------------------- |
| 91 | * 0 0 SEG.SEQ = RCV.NXT |
| 92 | * 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 93 | * >0 0 not acceptable |
| 94 | * >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 95 | * or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND |
| 96 | * |
| 97 | * This ultimately consists in checking if segment falls within the window. |
| 98 | * The one important difference compared to RFC793 is that we use rcv_las, |
| 99 | * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the |
| 100 | * peer's reference when computing our receive window. |
| 101 | * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 102 | * This: |
| 103 | * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) |
| 104 | * however, is too strict when we have retransmits. Instead we just check that |
| 105 | * the seq is not beyond the right edge and that the end of the segment is not |
| 106 | * less than the left edge. |
| 107 | * |
| 108 | * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so |
| 109 | * use rcv_nxt in the right edge window test instead of rcv_las. |
| 110 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 111 | */ |
| 112 | always_inline u8 |
| 113 | tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) |
| 114 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 115 | return (seq_geq (end_seq, tc->rcv_las) |
| 116 | && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 117 | } |
| 118 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 119 | /** |
| 120 | * Parse TCP header options. |
| 121 | * |
| 122 | * @param th TCP header |
| 123 | * @param to TCP options data structure to be populated |
| 124 | * @return -1 if parsing failed |
| 125 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 126 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 127 | tcp_options_parse (tcp_header_t * th, tcp_options_t * to) |
| 128 | { |
| 129 | const u8 *data; |
| 130 | u8 opt_len, opts_len, kind; |
| 131 | int j; |
| 132 | sack_block_t b; |
| 133 | |
| 134 | opts_len = (tcp_doff (th) << 2) - sizeof (tcp_header_t); |
| 135 | data = (const u8 *) (th + 1); |
| 136 | |
| 137 | /* Zero out all flags but those set in SYN */ |
Florin Coras | d6fe5bd | 2018-10-16 19:52:10 -0700 | [diff] [blame] | 138 | to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE |
| 139 | | TCP_OPTS_FLAG_SACK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 140 | |
| 141 | for (; opts_len > 0; opts_len -= opt_len, data += opt_len) |
| 142 | { |
| 143 | kind = data[0]; |
| 144 | |
| 145 | /* Get options length */ |
| 146 | if (kind == TCP_OPTION_EOL) |
| 147 | break; |
| 148 | else if (kind == TCP_OPTION_NOOP) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 149 | { |
| 150 | opt_len = 1; |
| 151 | continue; |
| 152 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 153 | else |
| 154 | { |
| 155 | /* broken options */ |
| 156 | if (opts_len < 2) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 157 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 158 | opt_len = data[1]; |
| 159 | |
| 160 | /* weird option length */ |
| 161 | if (opt_len < 2 || opt_len > opts_len) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 162 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | /* Parse options */ |
| 166 | switch (kind) |
| 167 | { |
| 168 | case TCP_OPTION_MSS: |
| 169 | if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th)) |
| 170 | { |
| 171 | to->flags |= TCP_OPTS_FLAG_MSS; |
| 172 | to->mss = clib_net_to_host_u16 (*(u16 *) (data + 2)); |
| 173 | } |
| 174 | break; |
| 175 | case TCP_OPTION_WINDOW_SCALE: |
| 176 | if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th)) |
| 177 | { |
| 178 | to->flags |= TCP_OPTS_FLAG_WSCALE; |
| 179 | to->wscale = data[2]; |
| 180 | if (to->wscale > TCP_MAX_WND_SCALE) |
| 181 | { |
| 182 | clib_warning ("Illegal window scaling value: %d", |
| 183 | to->wscale); |
| 184 | to->wscale = TCP_MAX_WND_SCALE; |
| 185 | } |
| 186 | } |
| 187 | break; |
| 188 | case TCP_OPTION_TIMESTAMP: |
| 189 | if (opt_len == TCP_OPTION_LEN_TIMESTAMP) |
| 190 | { |
| 191 | to->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 192 | to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2)); |
| 193 | to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6)); |
| 194 | } |
| 195 | break; |
| 196 | case TCP_OPTION_SACK_PERMITTED: |
| 197 | if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th)) |
| 198 | to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 199 | break; |
| 200 | case TCP_OPTION_SACK_BLOCK: |
| 201 | /* If SACK permitted was not advertised or a SYN, break */ |
| 202 | if ((to->flags & TCP_OPTS_FLAG_SACK_PERMITTED) == 0 || tcp_syn (th)) |
| 203 | break; |
| 204 | |
| 205 | /* If too short or not correctly formatted, break */ |
| 206 | if (opt_len < 10 || ((opt_len - 2) % TCP_OPTION_LEN_SACK_BLOCK)) |
| 207 | break; |
| 208 | |
| 209 | to->flags |= TCP_OPTS_FLAG_SACK; |
| 210 | to->n_sack_blocks = (opt_len - 2) / TCP_OPTION_LEN_SACK_BLOCK; |
| 211 | vec_reset_length (to->sacks); |
| 212 | for (j = 0; j < to->n_sack_blocks; j++) |
| 213 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 214 | b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j)); |
| 215 | b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 216 | vec_add1 (to->sacks, b); |
| 217 | } |
| 218 | break; |
| 219 | default: |
| 220 | /* Nothing to see here */ |
| 221 | continue; |
| 222 | } |
| 223 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 224 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 225 | } |
| 226 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 227 | /** |
| 228 | * RFC1323: Check against wrapped sequence numbers (PAWS). If we have |
| 229 | * timestamp to echo and it's less than tsval_recent, drop segment |
| 230 | * but still send an ACK in order to retain TCP's mechanism for detecting |
| 231 | * and recovering from half-open connections |
| 232 | * |
| 233 | * Or at least that's what the theory says. It seems that this might not work |
| 234 | * very well with packet reordering and fast retransmit. XXX |
| 235 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 236 | always_inline int |
| 237 | tcp_segment_check_paws (tcp_connection_t * tc) |
| 238 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 239 | return tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent |
| 240 | && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 244 | * Update tsval recent |
| 245 | */ |
| 246 | always_inline void |
| 247 | tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) |
| 248 | { |
| 249 | /* |
| 250 | * RFC1323: If Last.ACK.sent falls within the range of sequence numbers |
| 251 | * of an incoming segment: |
| 252 | * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN |
| 253 | * then the TSval from the segment is copied to TS.Recent; |
| 254 | * otherwise, the TSval is ignored. |
| 255 | */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 256 | if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) |
| 257 | && seq_leq (tc->rcv_las, seq_end)) |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 258 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 259 | ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 260 | tc->tsval_recent = tc->rcv_opts.tsval; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 261 | tc->tsval_recent_age = tcp_time_now (); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 266 | * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 |
| 267 | * |
| 268 | * It first verifies if segment has a wrapped sequence number (PAWS) and then |
| 269 | * does the processing associated to the first four steps (ignoring security |
| 270 | * and precedence): sequence number, rst bit and syn bit checks. |
| 271 | * |
| 272 | * @return 0 if segments passes validation. |
| 273 | */ |
| 274 | static int |
| 275 | tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0, |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 276 | vlib_buffer_t * b0, tcp_header_t * th0, |
| 277 | u32 * next0, u32 * error0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 278 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 279 | /* We could get a burst of RSTs interleaved with acks */ |
| 280 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 281 | { |
| 282 | tcp_send_reset (tc0); |
| 283 | *error0 = TCP_ERROR_CONNECTION_CLOSED; |
| 284 | goto drop; |
| 285 | } |
| 286 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 287 | if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 288 | { |
| 289 | *error0 = TCP_ERROR_SEGMENT_INVALID; |
| 290 | goto drop; |
| 291 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 292 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 293 | if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts))) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 294 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 295 | clib_warning ("options parse error"); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 296 | *error0 = TCP_ERROR_OPTIONS; |
| 297 | goto drop; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 298 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 299 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 300 | if (PREDICT_FALSE (tcp_segment_check_paws (tc0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 301 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 302 | *error0 = TCP_ERROR_PAWS; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 303 | if (CLIB_DEBUG > 2) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 304 | clib_warning ("paws failed\n%U", format_tcp_connection, tc0, 2); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 305 | TCP_EVT_DBG (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, |
| 306 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 307 | |
| 308 | /* If it just so happens that a segment updates tsval_recent for a |
| 309 | * segment over 24 days old, invalidate tsval_recent. */ |
| 310 | if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, |
| 311 | tcp_time_now ())) |
| 312 | { |
| 313 | /* Age isn't reset until we get a valid tsval (bsd inspired) */ |
| 314 | tc0->tsval_recent = 0; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 315 | clib_warning ("paws failed - really old segment. REALLY?"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 316 | } |
| 317 | else |
| 318 | { |
| 319 | /* Drop after ack if not rst */ |
| 320 | if (!tcp_rst (th0)) |
| 321 | { |
| 322 | tcp_make_ack (tc0, b0); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 323 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 324 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 325 | } |
| 326 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 327 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /* 1st: check sequence number */ |
| 331 | if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 332 | vnet_buffer (b0)->tcp.seq_end)) |
| 333 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 334 | *error0 = TCP_ERROR_RCV_WND; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 335 | /* 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] | 336 | * through for ack processing. It should be dropped later. */ |
| 337 | if (!(tc0->rcv_wnd == 0 |
| 338 | && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 339 | { |
| 340 | /* If not RST, send dup ack */ |
| 341 | if (!tcp_rst (th0)) |
| 342 | { |
| 343 | tcp_make_ack (tc0, b0); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 344 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 345 | goto error; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 346 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 347 | goto drop; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 348 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | /* 2nd: check the RST bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 352 | if (PREDICT_FALSE (tcp_rst (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 353 | { |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 354 | tcp_connection_reset (tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 355 | *error0 = TCP_ERROR_RST_RCVD; |
| 356 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | /* 3rd: check security and precedence (skip) */ |
| 360 | |
| 361 | /* 4th: check the SYN bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 362 | if (PREDICT_FALSE (tcp_syn (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 363 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 364 | /* TODO implement RFC 5961 */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 365 | if (tc0->state == TCP_STATE_SYN_RCVD) |
| 366 | { |
| 367 | tcp_make_synack (tc0, b0); |
| 368 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); |
| 369 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 370 | else |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 371 | { |
| 372 | tcp_make_ack (tc0, b0); |
| 373 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0); |
| 374 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 375 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 376 | } |
| 377 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 378 | /* If segment in window, save timestamp */ |
| 379 | tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 380 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 381 | return 0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 382 | |
| 383 | drop: |
| 384 | *next0 = tcp_next_drop (tc0->c_is_ip4); |
| 385 | return -1; |
| 386 | error: |
| 387 | *next0 = tcp_next_output (tc0->c_is_ip4); |
| 388 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | always_inline int |
| 392 | tcp_rcv_ack_is_acceptable (tcp_connection_t * tc0, vlib_buffer_t * tb0) |
| 393 | { |
| 394 | /* SND.UNA =< SEG.ACK =< SND.NXT */ |
| 395 | return (seq_leq (tc0->snd_una, vnet_buffer (tb0)->tcp.ack_number) |
| 396 | && seq_leq (vnet_buffer (tb0)->tcp.ack_number, tc0->snd_nxt)); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298 |
| 401 | * |
| 402 | * Note that although the original article, srtt and rttvar are scaled |
| 403 | * to minimize round-off errors, here we don't. Instead, we rely on |
| 404 | * better precision time measurements. |
| 405 | * |
| 406 | * TODO support us rtt resolution |
| 407 | */ |
| 408 | static void |
| 409 | tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) |
| 410 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 411 | int err, diff; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 412 | |
| 413 | if (tc->srtt != 0) |
| 414 | { |
| 415 | err = mrtt - tc->srtt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 416 | |
| 417 | /* XXX Drop in RTT results in RTTVAR increase and bigger RTO. |
| 418 | * The increase should be bound */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 419 | tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); |
| 420 | diff = (clib_abs (err) - (int) tc->rttvar) >> 2; |
| 421 | tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 422 | } |
| 423 | else |
| 424 | { |
| 425 | /* First measurement. */ |
| 426 | tc->srtt = mrtt; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 427 | tc->rttvar = mrtt >> 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 428 | } |
| 429 | } |
| 430 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 431 | void |
| 432 | tcp_update_rto (tcp_connection_t * tc) |
| 433 | { |
| 434 | tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 435 | tc->rto = clib_max (tc->rto, TCP_RTO_MIN); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 438 | /** |
| 439 | * Update RTT estimate and RTO timer |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 440 | * |
| 441 | * Measure RTT: We have two sources of RTT measurements: TSOPT and ACK |
| 442 | * timing. Middle boxes are known to fiddle with TCP options so we |
| 443 | * should give higher priority to ACK timing. |
| 444 | * |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 445 | * This should be called only if previously sent bytes have been acked. |
| 446 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 447 | * return 1 if valid rtt 0 otherwise |
| 448 | */ |
| 449 | static int |
| 450 | tcp_update_rtt (tcp_connection_t * tc, u32 ack) |
| 451 | { |
| 452 | u32 mrtt = 0; |
| 453 | |
| 454 | /* Karn's rule, part 1. Don't use retransmitted segments to estimate |
| 455 | * RTT because they're ambiguous. */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 456 | if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 457 | { |
| 458 | if (tcp_in_recovery (tc)) |
| 459 | return 0; |
| 460 | goto done; |
| 461 | } |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 462 | |
| 463 | if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 464 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 465 | tc->mrtt_us = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts; |
| 466 | mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 467 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 468 | /* As per RFC7323 TSecr can be used for RTTM only if the segment advances |
| 469 | * snd_una, i.e., the left side of the send window: |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 470 | * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ |
| 471 | else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 472 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 473 | mrtt = clib_max (tcp_time_now () - tc->rcv_opts.tsecr, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 474 | } |
| 475 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 476 | /* Ignore dubious measurements */ |
| 477 | if (mrtt == 0 || mrtt > TCP_RTT_MAX) |
| 478 | goto done; |
| 479 | |
| 480 | tcp_estimate_rtt (tc, mrtt); |
| 481 | |
| 482 | done: |
| 483 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 484 | /* Allow measuring of a new RTT */ |
| 485 | tc->rtt_ts = 0; |
| 486 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 487 | /* 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] | 488 | * even if mrtt is not valid since we update the rto lower */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 489 | tc->rto_boff = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 490 | tcp_update_rto (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 491 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 492 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Dequeue bytes that have been acked and while at it update RTT estimates. |
| 497 | */ |
| 498 | static void |
| 499 | tcp_dequeue_acked (tcp_connection_t * tc, u32 ack) |
| 500 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 501 | /* Dequeue the newly ACKed add SACKed bytes */ |
| 502 | stream_session_dequeue_drop (&tc->connection, |
| 503 | tc->bytes_acked + tc->sack_sb.snd_una_adv); |
| 504 | |
| 505 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 506 | |
| 507 | /* Update rtt and rto */ |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 508 | tcp_update_rtt (tc, ack); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 509 | |
| 510 | /* If everything has been acked, stop retransmit timer |
| 511 | * otherwise update. */ |
| 512 | tcp_retransmit_timer_update (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 513 | } |
| 514 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 515 | /** |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 516 | * Check if duplicate ack as per RFC5681 Sec. 2 |
| 517 | */ |
| 518 | static u8 |
| 519 | tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, |
| 520 | u32 prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 521 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 522 | return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 523 | && seq_gt (tc->snd_una_max, tc->snd_una) |
| 524 | && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 525 | && (prev_snd_wnd == tc->snd_wnd)); |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * Checks if ack is a congestion control event. |
| 530 | */ |
| 531 | static u8 |
| 532 | tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, |
| 533 | u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) |
| 534 | { |
| 535 | /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are |
| 536 | * defined to be 'duplicate' */ |
| 537 | *is_dack = tc->sack_sb.last_sacked_bytes |
| 538 | || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); |
| 539 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 540 | return ((*is_dack || tcp_in_cong_recovery (tc)) && !tcp_is_lost_fin (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 541 | } |
| 542 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 543 | static u32 |
| 544 | scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 545 | { |
| 546 | ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes)); |
| 547 | return hole - sb->holes; |
| 548 | } |
| 549 | |
| 550 | static u32 |
| 551 | scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) |
| 552 | { |
| 553 | return hole->end - hole->start; |
| 554 | } |
| 555 | |
| 556 | sack_scoreboard_hole_t * |
| 557 | scoreboard_get_hole (sack_scoreboard_t * sb, u32 index) |
| 558 | { |
| 559 | if (index != TCP_INVALID_SACK_HOLE_INDEX) |
| 560 | return pool_elt_at_index (sb->holes, index); |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | sack_scoreboard_hole_t * |
| 565 | scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 566 | { |
| 567 | if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| 568 | return pool_elt_at_index (sb->holes, hole->next); |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | sack_scoreboard_hole_t * |
| 573 | scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 574 | { |
| 575 | if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) |
| 576 | return pool_elt_at_index (sb->holes, hole->prev); |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | sack_scoreboard_hole_t * |
| 581 | scoreboard_first_hole (sack_scoreboard_t * sb) |
| 582 | { |
| 583 | if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) |
| 584 | return pool_elt_at_index (sb->holes, sb->head); |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | sack_scoreboard_hole_t * |
| 589 | scoreboard_last_hole (sack_scoreboard_t * sb) |
| 590 | { |
| 591 | if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX) |
| 592 | return pool_elt_at_index (sb->holes, sb->tail); |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 597 | scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 598 | { |
| 599 | sack_scoreboard_hole_t *next, *prev; |
| 600 | |
| 601 | if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| 602 | { |
| 603 | next = pool_elt_at_index (sb->holes, hole->next); |
| 604 | next->prev = hole->prev; |
| 605 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 606 | else |
| 607 | { |
| 608 | sb->tail = hole->prev; |
| 609 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 610 | |
| 611 | if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) |
| 612 | { |
| 613 | prev = pool_elt_at_index (sb->holes, hole->prev); |
| 614 | prev->next = hole->next; |
| 615 | } |
| 616 | else |
| 617 | { |
| 618 | sb->head = hole->next; |
| 619 | } |
| 620 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 621 | if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole) |
| 622 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 623 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 624 | /* Poison the entry */ |
| 625 | if (CLIB_DEBUG > 0) |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 626 | clib_memset (hole, 0xfe, sizeof (*hole)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 627 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 628 | pool_put (sb->holes, hole); |
| 629 | } |
| 630 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 631 | static sack_scoreboard_hole_t * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 632 | scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 633 | u32 start, u32 end) |
| 634 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 635 | sack_scoreboard_hole_t *hole, *next, *prev; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 636 | u32 hole_index; |
| 637 | |
| 638 | pool_get (sb->holes, hole); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 639 | clib_memset (hole, 0, sizeof (*hole)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 640 | |
| 641 | hole->start = start; |
| 642 | hole->end = end; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 643 | hole_index = scoreboard_hole_index (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 644 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 645 | prev = scoreboard_get_hole (sb, prev_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 646 | if (prev) |
| 647 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 648 | hole->prev = prev_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 649 | hole->next = prev->next; |
| 650 | |
| 651 | if ((next = scoreboard_next_hole (sb, hole))) |
| 652 | next->prev = hole_index; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 653 | else |
| 654 | sb->tail = hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 655 | |
| 656 | prev->next = hole_index; |
| 657 | } |
| 658 | else |
| 659 | { |
| 660 | sb->head = hole_index; |
| 661 | hole->prev = TCP_INVALID_SACK_HOLE_INDEX; |
| 662 | hole->next = TCP_INVALID_SACK_HOLE_INDEX; |
| 663 | } |
| 664 | |
| 665 | return hole; |
| 666 | } |
| 667 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 668 | static void |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 669 | scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 670 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 671 | sack_scoreboard_hole_t *left, *right; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 672 | u32 bytes = 0, blks = 0; |
| 673 | |
| 674 | sb->lost_bytes = 0; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 675 | sb->sacked_bytes = 0; |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 676 | left = scoreboard_last_hole (sb); |
| 677 | if (!left) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 678 | return; |
| 679 | |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 680 | if (seq_gt (sb->high_sacked, left->end)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 681 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 682 | bytes = sb->high_sacked - left->end; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 683 | blks = 1; |
| 684 | } |
| 685 | |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 686 | while ((right = left) |
| 687 | && bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss |
| 688 | && blks < TCP_DUPACK_THRESHOLD |
| 689 | /* left not updated if above conditions fail */ |
| 690 | && (left = scoreboard_prev_hole (sb, right))) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 691 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 692 | bytes += right->start - left->end; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 693 | blks++; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 694 | } |
| 695 | |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 696 | /* left is first lost */ |
| 697 | if (left) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 698 | { |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 699 | do |
| 700 | { |
| 701 | sb->lost_bytes += scoreboard_hole_bytes (right); |
| 702 | left->is_lost = 1; |
| 703 | left = scoreboard_prev_hole (sb, right); |
| 704 | if (left) |
| 705 | bytes += right->start - left->end; |
| 706 | } |
| 707 | while ((right = left)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 708 | } |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 709 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 710 | sb->sacked_bytes = bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | /** |
| 714 | * Figure out the next hole to retransmit |
| 715 | * |
| 716 | * Follows logic proposed in RFC6675 Sec. 4, NextSeg() |
| 717 | */ |
| 718 | sack_scoreboard_hole_t * |
| 719 | scoreboard_next_rxt_hole (sack_scoreboard_t * sb, |
| 720 | sack_scoreboard_hole_t * start, |
| 721 | u8 have_sent_1_smss, |
| 722 | u8 * can_rescue, u8 * snd_limited) |
| 723 | { |
| 724 | sack_scoreboard_hole_t *hole = 0; |
| 725 | |
| 726 | hole = start ? start : scoreboard_first_hole (sb); |
| 727 | while (hole && seq_leq (hole->end, sb->high_rxt) && hole->is_lost) |
| 728 | hole = scoreboard_next_hole (sb, hole); |
| 729 | |
| 730 | /* Nothing, return */ |
| 731 | if (!hole) |
| 732 | { |
| 733 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 734 | return 0; |
| 735 | } |
| 736 | |
| 737 | /* Rule (1): if higher than rxt, less than high_sacked and lost */ |
| 738 | if (hole->is_lost && seq_lt (hole->start, sb->high_sacked)) |
| 739 | { |
| 740 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 741 | } |
| 742 | else |
| 743 | { |
| 744 | /* Rule (2): output takes care of transmitting new data */ |
| 745 | if (!have_sent_1_smss) |
| 746 | { |
| 747 | hole = 0; |
| 748 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 749 | } |
| 750 | /* Rule (3): if hole not lost */ |
| 751 | else if (seq_lt (hole->start, sb->high_sacked)) |
| 752 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 753 | *snd_limited = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 754 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 755 | } |
| 756 | /* Rule (4): if hole beyond high_sacked */ |
| 757 | else |
| 758 | { |
| 759 | ASSERT (seq_geq (hole->start, sb->high_sacked)); |
| 760 | *snd_limited = 1; |
| 761 | *can_rescue = 1; |
| 762 | /* HighRxt MUST NOT be updated */ |
| 763 | return 0; |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | if (hole && seq_lt (sb->high_rxt, hole->start)) |
| 768 | sb->high_rxt = hole->start; |
| 769 | |
| 770 | return hole; |
| 771 | } |
| 772 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 773 | static void |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 774 | scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 seq) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 775 | { |
| 776 | sack_scoreboard_hole_t *hole; |
| 777 | hole = scoreboard_first_hole (sb); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 778 | if (hole) |
| 779 | { |
| 780 | seq = seq_gt (seq, hole->start) ? seq : hole->start; |
| 781 | sb->cur_rxt_hole = sb->head; |
| 782 | } |
| 783 | sb->high_rxt = seq; |
| 784 | } |
| 785 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 786 | void |
| 787 | scoreboard_init (sack_scoreboard_t * sb) |
| 788 | { |
| 789 | sb->head = TCP_INVALID_SACK_HOLE_INDEX; |
| 790 | sb->tail = TCP_INVALID_SACK_HOLE_INDEX; |
| 791 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 792 | } |
| 793 | |
| 794 | void |
| 795 | scoreboard_clear (sack_scoreboard_t * sb) |
| 796 | { |
| 797 | sack_scoreboard_hole_t *hole; |
| 798 | while ((hole = scoreboard_first_hole (sb))) |
| 799 | { |
| 800 | scoreboard_remove_hole (sb, hole); |
| 801 | } |
| 802 | ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX); |
| 803 | ASSERT (pool_elts (sb->holes) == 0); |
| 804 | sb->sacked_bytes = 0; |
| 805 | sb->last_sacked_bytes = 0; |
| 806 | sb->last_bytes_delivered = 0; |
| 807 | sb->snd_una_adv = 0; |
| 808 | sb->high_sacked = 0; |
| 809 | sb->high_rxt = 0; |
| 810 | sb->lost_bytes = 0; |
| 811 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 812 | } |
| 813 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 814 | /** |
| 815 | * Test that scoreboard is sane after recovery |
| 816 | * |
| 817 | * Returns 1 if scoreboard is empty or if first hole beyond |
| 818 | * snd_una. |
| 819 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 820 | static u8 |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 821 | tcp_scoreboard_is_sane_post_recovery (tcp_connection_t * tc) |
| 822 | { |
| 823 | sack_scoreboard_hole_t *hole; |
| 824 | hole = scoreboard_first_hole (&tc->sack_sb); |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 825 | return (!hole || (seq_geq (hole->start, tc->snd_una) |
| 826 | && seq_lt (hole->end, tc->snd_una_max))); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 830 | tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) |
| 831 | { |
| 832 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 833 | sack_block_t *blk, tmp; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 834 | sack_scoreboard_hole_t *hole, *next_hole, *last_hole; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 835 | u32 blk_index = 0, old_sacked_bytes, hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 836 | int i, j; |
| 837 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 838 | sb->last_sacked_bytes = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 839 | sb->last_bytes_delivered = 0; |
Florin Coras | 352c2c4 | 2018-06-26 01:22:41 -0700 | [diff] [blame] | 840 | sb->snd_una_adv = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 841 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 842 | if (!tcp_opts_sack (&tc->rcv_opts) |
| 843 | && sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 844 | return; |
| 845 | |
Florin Coras | 352c2c4 | 2018-06-26 01:22:41 -0700 | [diff] [blame] | 846 | old_sacked_bytes = sb->sacked_bytes; |
| 847 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 848 | /* Remove invalid blocks */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 849 | blk = tc->rcv_opts.sacks; |
| 850 | while (blk < vec_end (tc->rcv_opts.sacks)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 851 | { |
| 852 | if (seq_lt (blk->start, blk->end) |
| 853 | && seq_gt (blk->start, tc->snd_una) |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 854 | && seq_gt (blk->start, ack) && seq_leq (blk->end, tc->snd_una_max)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 855 | { |
| 856 | blk++; |
| 857 | continue; |
| 858 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 859 | vec_del1 (tc->rcv_opts.sacks, blk - tc->rcv_opts.sacks); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 860 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 861 | |
| 862 | /* Add block for cumulative ack */ |
| 863 | if (seq_gt (ack, tc->snd_una)) |
| 864 | { |
| 865 | tmp.start = tc->snd_una; |
| 866 | tmp.end = ack; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 867 | vec_add1 (tc->rcv_opts.sacks, tmp); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 868 | } |
| 869 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 870 | if (vec_len (tc->rcv_opts.sacks) == 0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 871 | return; |
| 872 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 873 | tcp_scoreboard_trace_add (tc, ack); |
| 874 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 875 | /* Make sure blocks are ordered */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 876 | for (i = 0; i < vec_len (tc->rcv_opts.sacks); i++) |
| 877 | for (j = i + 1; j < vec_len (tc->rcv_opts.sacks); j++) |
| 878 | if (seq_lt (tc->rcv_opts.sacks[j].start, tc->rcv_opts.sacks[i].start)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 879 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 880 | tmp = tc->rcv_opts.sacks[i]; |
| 881 | tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j]; |
| 882 | tc->rcv_opts.sacks[j] = tmp; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 883 | } |
| 884 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 885 | if (sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
| 886 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 887 | /* If no holes, insert the first that covers all outstanding bytes */ |
| 888 | last_hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, |
| 889 | tc->snd_una, tc->snd_una_max); |
| 890 | sb->tail = scoreboard_hole_index (sb, last_hole); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 891 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
| 892 | sb->high_sacked = tmp.end; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 893 | } |
| 894 | else |
| 895 | { |
| 896 | /* If we have holes but snd_una_max is beyond the last hole, update |
| 897 | * last hole end */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 898 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 899 | last_hole = scoreboard_last_hole (sb); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 900 | if (seq_gt (tc->snd_una_max, last_hole->end)) |
| 901 | { |
| 902 | if (seq_geq (last_hole->start, sb->high_sacked)) |
| 903 | { |
| 904 | last_hole->end = tc->snd_una_max; |
| 905 | } |
| 906 | /* New hole after high sacked block */ |
| 907 | else if (seq_lt (sb->high_sacked, tc->snd_una_max)) |
| 908 | { |
| 909 | scoreboard_insert_hole (sb, sb->tail, sb->high_sacked, |
| 910 | tc->snd_una_max); |
| 911 | } |
| 912 | } |
| 913 | /* Keep track of max byte sacked for when the last hole |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 914 | * is acked */ |
| 915 | if (seq_gt (tmp.end, sb->high_sacked)) |
| 916 | sb->high_sacked = tmp.end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | /* Walk the holes with the SACK blocks */ |
| 920 | hole = pool_elt_at_index (sb->holes, sb->head); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 921 | while (hole && blk_index < vec_len (tc->rcv_opts.sacks)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 922 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 923 | blk = &tc->rcv_opts.sacks[blk_index]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 924 | if (seq_leq (blk->start, hole->start)) |
| 925 | { |
| 926 | /* Block covers hole. Remove hole */ |
| 927 | if (seq_geq (blk->end, hole->end)) |
| 928 | { |
| 929 | next_hole = scoreboard_next_hole (sb, hole); |
| 930 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 931 | /* Byte accounting: snd_una needs to be advanced */ |
| 932 | if (blk->end == ack) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 933 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 934 | if (next_hole) |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 935 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 936 | if (seq_lt (ack, next_hole->start)) |
| 937 | sb->snd_una_adv = next_hole->start - ack; |
| 938 | sb->last_bytes_delivered += |
| 939 | next_hole->start - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 940 | } |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 941 | else |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 942 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 943 | ASSERT (seq_geq (sb->high_sacked, ack)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 944 | sb->snd_una_adv = sb->high_sacked - ack; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 945 | sb->last_bytes_delivered += sb->high_sacked - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 946 | } |
| 947 | } |
| 948 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 949 | scoreboard_remove_hole (sb, hole); |
| 950 | hole = next_hole; |
| 951 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 952 | /* Partial 'head' overlap */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 953 | else |
| 954 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 955 | if (seq_gt (blk->end, hole->start)) |
| 956 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 957 | hole->start = blk->end; |
| 958 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 959 | blk_index++; |
| 960 | } |
| 961 | } |
| 962 | else |
| 963 | { |
| 964 | /* Hole must be split */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 965 | if (seq_lt (blk->end, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 966 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 967 | hole_index = scoreboard_hole_index (sb, hole); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 968 | next_hole = scoreboard_insert_hole (sb, hole_index, blk->end, |
| 969 | hole->end); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 970 | |
| 971 | /* Pool might've moved */ |
| 972 | hole = scoreboard_get_hole (sb, hole_index); |
| 973 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 974 | blk_index++; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 975 | ASSERT (hole->next == scoreboard_hole_index (sb, next_hole)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 976 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 977 | else if (seq_lt (blk->start, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 978 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 979 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 980 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 981 | hole = scoreboard_next_hole (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 982 | } |
| 983 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 984 | |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 985 | if (pool_elts (sb->holes) == 1) |
| 986 | { |
| 987 | hole = scoreboard_first_hole (sb); |
| 988 | if (hole->start == ack + sb->snd_una_adv |
| 989 | && hole->end == tc->snd_una_max) |
| 990 | scoreboard_remove_hole (sb, hole); |
| 991 | } |
| 992 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 993 | scoreboard_update_bytes (tc, sb); |
| 994 | sb->last_sacked_bytes = sb->sacked_bytes |
| 995 | - (old_sacked_bytes - sb->last_bytes_delivered); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 996 | ASSERT (sb->last_sacked_bytes <= sb->sacked_bytes || tcp_in_recovery (tc)); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 997 | ASSERT (sb->sacked_bytes == 0 || tcp_in_recovery (tc) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 998 | || sb->sacked_bytes < tc->snd_una_max - seq_max (tc->snd_una, ack)); |
| 999 | ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_una_max |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1000 | - seq_max (tc->snd_una, ack) || tcp_in_recovery (tc)); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1001 | ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc) |
| 1002 | || sb->holes[sb->head].start == ack + sb->snd_una_adv); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1003 | TCP_EVT_DBG (TCP_EVT_CC_SCOREBOARD, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1004 | } |
| 1005 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1006 | /** |
| 1007 | * Try to update snd_wnd based on feedback received from peer. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1008 | * |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1009 | * If successful, and new window is 'effectively' 0, activate persist |
| 1010 | * timer. |
| 1011 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1012 | static void |
| 1013 | tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) |
| 1014 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1015 | /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set |
| 1016 | * 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] | 1017 | if (seq_lt (tc->snd_wl1, seq) |
| 1018 | || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1019 | { |
| 1020 | tc->snd_wnd = snd_wnd; |
| 1021 | tc->snd_wl1 = seq; |
| 1022 | tc->snd_wl2 = ack; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1023 | TCP_EVT_DBG (TCP_EVT_SND_WND, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1024 | |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1025 | if (tc->snd_wnd < tc->snd_mss) |
| 1026 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1027 | /* Set persist timer if not set and we just got 0 wnd */ |
| 1028 | if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) |
| 1029 | && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1030 | tcp_persist_timer_set (tc); |
| 1031 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1032 | else |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1033 | { |
| 1034 | tcp_persist_timer_reset (tc); |
| 1035 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1036 | { |
| 1037 | tc->rto_boff = 0; |
| 1038 | tcp_update_rto (tc); |
| 1039 | } |
| 1040 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1041 | } |
| 1042 | } |
| 1043 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1044 | /** |
| 1045 | * Init loss recovery/fast recovery. |
| 1046 | * |
| 1047 | * Triggered by dup acks as opposed to timer timeout. Note that cwnd is |
| 1048 | * updated in @ref tcp_cc_handle_event after fast retransmit |
| 1049 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1050 | void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1051 | tcp_cc_init_congestion (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1052 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1053 | tcp_fastrecovery_on (tc); |
| 1054 | tc->snd_congestion = tc->snd_una_max; |
Florin Coras | 6216600 | 2018-04-18 16:40:55 -0700 | [diff] [blame] | 1055 | tc->cwnd_acc_bytes = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1056 | tc->snd_rxt_bytes = 0; |
| 1057 | tc->prev_ssthresh = tc->ssthresh; |
| 1058 | tc->prev_cwnd = tc->cwnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1059 | tc->cc_algo->congestion (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1060 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1061 | } |
| 1062 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1063 | static void |
| 1064 | tcp_cc_recovery_exit (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1065 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1066 | tc->rto_boff = 0; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1067 | tcp_update_rto (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1068 | tc->snd_rxt_ts = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1069 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1070 | tcp_recovery_off (tc); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1071 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1072 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1073 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1074 | void |
| 1075 | tcp_cc_fastrecovery_exit (tcp_connection_t * tc) |
| 1076 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1077 | tc->cc_algo->recovered (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1078 | tc->snd_rxt_bytes = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1079 | tc->rcv_dupacks = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1080 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1081 | tc->snd_rxt_bytes = 0; |
| 1082 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1083 | tcp_fastrecovery_off (tc); |
| 1084 | tcp_fastrecovery_1_smss_off (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1085 | tcp_fastrecovery_first_off (tc); |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1086 | |
| 1087 | /* Update pacer because our cwnd changed. Also makes sure |
| 1088 | * that we recompute the max burst size */ |
| 1089 | tcp_update_pacer (tc); |
| 1090 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1091 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1092 | } |
| 1093 | |
| 1094 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1095 | tcp_cc_congestion_undo (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1096 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1097 | tc->cwnd = tc->prev_cwnd; |
| 1098 | tc->ssthresh = tc->prev_ssthresh; |
| 1099 | tc->snd_nxt = tc->snd_una_max; |
| 1100 | tc->rcv_dupacks = 0; |
| 1101 | if (tcp_in_recovery (tc)) |
| 1102 | tcp_cc_recovery_exit (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1103 | else if (tcp_in_fastrecovery (tc)) |
| 1104 | tcp_cc_fastrecovery_exit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1105 | ASSERT (tc->rto_boff == 0); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1106 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1107 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1108 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1109 | static inline u8 |
| 1110 | tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1111 | { |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1112 | return (tcp_in_recovery (tc) && tc->rto_boff == 1 |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1113 | && tc->snd_rxt_ts |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1114 | && tcp_opts_tstamp (&tc->rcv_opts) |
| 1115 | && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); |
| 1116 | } |
| 1117 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1118 | static inline u8 |
| 1119 | tcp_cc_is_spurious_fast_rxt (tcp_connection_t * tc) |
| 1120 | { |
| 1121 | return (tcp_in_fastrecovery (tc) |
| 1122 | && tc->cwnd > tc->ssthresh + 3 * tc->snd_mss); |
| 1123 | } |
| 1124 | |
| 1125 | static u8 |
| 1126 | tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) |
| 1127 | { |
| 1128 | return (tcp_cc_is_spurious_timeout_rxt (tc) |
| 1129 | || tcp_cc_is_spurious_fast_rxt (tc)); |
| 1130 | } |
| 1131 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1132 | static int |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1133 | tcp_cc_recover (tcp_connection_t * tc) |
| 1134 | { |
| 1135 | ASSERT (tcp_in_cong_recovery (tc)); |
| 1136 | if (tcp_cc_is_spurious_retransmit (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1137 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1138 | tcp_cc_congestion_undo (tc); |
| 1139 | return 1; |
| 1140 | } |
| 1141 | |
| 1142 | if (tcp_in_recovery (tc)) |
| 1143 | tcp_cc_recovery_exit (tc); |
| 1144 | else if (tcp_in_fastrecovery (tc)) |
| 1145 | tcp_cc_fastrecovery_exit (tc); |
| 1146 | |
| 1147 | ASSERT (tc->rto_boff == 0); |
| 1148 | ASSERT (!tcp_in_cong_recovery (tc)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1149 | ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1150 | return 0; |
| 1151 | } |
| 1152 | |
| 1153 | static void |
| 1154 | tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b) |
| 1155 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1156 | ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1157 | |
| 1158 | /* Congestion avoidance */ |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1159 | tcp_cc_rcv_ack (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1160 | |
| 1161 | /* If a cumulative ack, make sure dupacks is 0 */ |
| 1162 | tc->rcv_dupacks = 0; |
| 1163 | |
| 1164 | /* When dupacks hits the threshold we only enter fast retransmit if |
| 1165 | * cumulative ack covers more than snd_congestion. Should snd_una |
| 1166 | * wrap this test may fail under otherwise valid circumstances. |
| 1167 | * Therefore, proactively update snd_congestion when wrap detected. */ |
| 1168 | if (PREDICT_FALSE |
| 1169 | (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked) |
| 1170 | && seq_gt (tc->snd_congestion, tc->snd_una))) |
| 1171 | tc->snd_congestion = tc->snd_una - 1; |
| 1172 | } |
| 1173 | |
| 1174 | static u8 |
| 1175 | tcp_should_fastrecover_sack (tcp_connection_t * tc) |
| 1176 | { |
| 1177 | return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes; |
| 1178 | } |
| 1179 | |
| 1180 | static u8 |
| 1181 | tcp_should_fastrecover (tcp_connection_t * tc) |
| 1182 | { |
| 1183 | return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD |
| 1184 | || tcp_should_fastrecover_sack (tc)); |
| 1185 | } |
| 1186 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1187 | void |
| 1188 | tcp_program_fastretransmit (tcp_connection_t * tc) |
| 1189 | { |
| 1190 | tcp_worker_ctx_t *wrk = &tcp_main.wrk_ctx[tc->c_thread_index]; |
| 1191 | if (!(tc->flags & TCP_CONN_FRXT_PENDING)) |
| 1192 | { |
| 1193 | vec_add1 (wrk->pending_fast_rxt, tc->c_c_index); |
| 1194 | tc->flags |= TCP_CONN_FRXT_PENDING; |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | void |
| 1199 | tcp_do_fastretransmits (u32 thread_index) |
| 1200 | { |
| 1201 | tcp_worker_ctx_t *wrk = &tcp_main.wrk_ctx[thread_index]; |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1202 | u32 max_burst_size, burst_size, n_segs = 0, n_segs_now; |
| 1203 | u32 *ongoing_fast_rxt, burst_bytes, sent_bytes; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1204 | tcp_connection_t *tc; |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1205 | u64 last_cpu_time; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1206 | int i; |
| 1207 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1208 | if (vec_len (wrk->pending_fast_rxt) == 0 |
| 1209 | && vec_len (wrk->postponed_fast_rxt) == 0) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1210 | return; |
| 1211 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1212 | last_cpu_time = wrk->vm->clib_time.last_cpu_time; |
| 1213 | ongoing_fast_rxt = wrk->ongoing_fast_rxt; |
| 1214 | vec_append (ongoing_fast_rxt, wrk->postponed_fast_rxt); |
| 1215 | vec_append (ongoing_fast_rxt, wrk->pending_fast_rxt); |
| 1216 | |
| 1217 | _vec_len (wrk->postponed_fast_rxt) = 0; |
| 1218 | _vec_len (wrk->pending_fast_rxt) = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1219 | |
| 1220 | max_burst_size = VLIB_FRAME_SIZE / vec_len (wrk->ongoing_fast_rxt); |
| 1221 | max_burst_size = clib_max (max_burst_size, 1); |
| 1222 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1223 | for (i = 0; i < vec_len (ongoing_fast_rxt); i++) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1224 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1225 | if (n_segs >= VLIB_FRAME_SIZE) |
| 1226 | { |
| 1227 | vec_add1 (wrk->postponed_fast_rxt, ongoing_fast_rxt[i]); |
| 1228 | continue; |
| 1229 | } |
| 1230 | |
| 1231 | tc = tcp_connection_get (ongoing_fast_rxt[i], thread_index); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1232 | tc->flags &= ~TCP_CONN_FRXT_PENDING; |
| 1233 | |
| 1234 | if (!tcp_in_fastrecovery (tc)) |
| 1235 | continue; |
| 1236 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1237 | burst_size = clib_min (max_burst_size, VLIB_FRAME_SIZE - n_segs); |
| 1238 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection, |
| 1239 | last_cpu_time); |
| 1240 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1241 | if (!burst_size) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1242 | { |
| 1243 | tcp_program_fastretransmit (tc); |
| 1244 | continue; |
| 1245 | } |
| 1246 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1247 | n_segs_now = tcp_fast_retransmit (tc, burst_size); |
| 1248 | sent_bytes = clib_min (n_segs_now * tc->snd_mss, burst_bytes); |
| 1249 | transport_connection_tx_pacer_update_bytes (&tc->connection, |
| 1250 | sent_bytes); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1251 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1252 | n_segs += n_segs_now; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1253 | } |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1254 | _vec_len (ongoing_fast_rxt) = 0; |
| 1255 | wrk->ongoing_fast_rxt = ongoing_fast_rxt; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1256 | } |
| 1257 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1258 | /** |
| 1259 | * One function to rule them all ... and in the darkness bind them |
| 1260 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1261 | static void |
| 1262 | tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack) |
| 1263 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1264 | u32 rxt_delivered; |
| 1265 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1266 | if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 1267 | { |
| 1268 | if (tc->bytes_acked) |
| 1269 | goto partial_ack; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1270 | tcp_program_fastretransmit (tc); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1271 | return; |
| 1272 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1273 | /* |
| 1274 | * Duplicate ACK. Check if we should enter fast recovery, or if already in |
| 1275 | * it account for the bytes that left the network. |
| 1276 | */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1277 | else if (is_dack && !tcp_in_recovery (tc)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1278 | { |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1279 | TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1280 | ASSERT (tc->snd_una != tc->snd_una_max |
| 1281 | || tc->sack_sb.last_sacked_bytes); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1282 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1283 | tc->rcv_dupacks++; |
| 1284 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1285 | /* Pure duplicate ack. If some data got acked, it's handled lower */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1286 | if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1287 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1288 | ASSERT (tcp_in_fastrecovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1289 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1290 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1291 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1292 | else if (tcp_should_fastrecover (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1293 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1294 | u32 byte_rate; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1295 | ASSERT (!tcp_in_fastrecovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1296 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1297 | /* Heuristic to catch potential late dupacks |
| 1298 | * after fast retransmit exits */ |
| 1299 | if (is_dack && tc->snd_una == tc->snd_congestion |
| 1300 | && timestamp_leq (tc->rcv_opts.tsecr, tc->tsecr_last_ack)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1301 | { |
| 1302 | tc->rcv_dupacks = 0; |
| 1303 | return; |
| 1304 | } |
| 1305 | |
| 1306 | tcp_cc_init_congestion (tc); |
| 1307 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1308 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1309 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1310 | { |
| 1311 | tc->cwnd = tc->ssthresh; |
| 1312 | scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una); |
| 1313 | tc->sack_sb.rescue_rxt = tc->snd_una - 1; |
| 1314 | } |
| 1315 | else |
| 1316 | { |
| 1317 | /* Post retransmit update cwnd to ssthresh and account for the |
| 1318 | * three segments that have left the network and should've been |
| 1319 | * buffered at the receiver XXX */ |
| 1320 | tc->cwnd = tc->ssthresh + 3 * tc->snd_mss; |
| 1321 | } |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1322 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame^] | 1323 | byte_rate = (0.3 * tc->cwnd) / ((f64) TCP_TICK * tc->srtt); |
| 1324 | transport_connection_tx_pacer_init (&tc->connection, byte_rate, 0); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1325 | tcp_program_fastretransmit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1326 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1327 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1328 | else if (!tc->bytes_acked |
| 1329 | || (tc->bytes_acked && !tcp_in_cong_recovery (tc))) |
| 1330 | { |
| 1331 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1332 | return; |
| 1333 | } |
| 1334 | else |
| 1335 | goto partial_ack; |
| 1336 | } |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1337 | /* Don't allow entry in fast recovery if still in recovery, for now */ |
| 1338 | else if (0 && is_dack && tcp_in_recovery (tc)) |
| 1339 | { |
| 1340 | /* If of of the two conditions lower hold, reset dupacks because |
| 1341 | * we're probably after timeout (RFC6582 heuristics). |
| 1342 | * If Cumulative ack does not cover more than congestion threshold, |
| 1343 | * and: |
| 1344 | * 1) The following doesn't hold: The congestion window is greater |
| 1345 | * than SMSS bytes and the difference between highest_ack |
| 1346 | * and prev_highest_ack is at most 4*SMSS bytes |
| 1347 | * 2) Echoed timestamp in the last non-dup ack does not equal the |
| 1348 | * stored timestamp |
| 1349 | */ |
| 1350 | if (seq_leq (tc->snd_una, tc->snd_congestion) |
| 1351 | && ((!(tc->cwnd > tc->snd_mss |
| 1352 | && tc->bytes_acked <= 4 * tc->snd_mss)) |
| 1353 | || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) |
| 1354 | { |
| 1355 | tc->rcv_dupacks = 0; |
| 1356 | return; |
| 1357 | } |
| 1358 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1359 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1360 | if (!tc->bytes_acked) |
| 1361 | return; |
| 1362 | |
| 1363 | partial_ack: |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1364 | TCP_EVT_DBG (TCP_EVT_CC_PACK, tc); |
| 1365 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1366 | /* |
| 1367 | * Legitimate ACK. 1) See if we can exit recovery |
| 1368 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1369 | |
| 1370 | if (seq_geq (tc->snd_una, tc->snd_congestion)) |
| 1371 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1372 | tcp_retransmit_timer_update (tc); |
| 1373 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1374 | /* If spurious return, we've already updated everything */ |
| 1375 | if (tcp_cc_recover (tc)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1376 | { |
| 1377 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 1378 | return; |
| 1379 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1380 | |
| 1381 | tc->snd_nxt = tc->snd_una_max; |
| 1382 | |
| 1383 | /* Treat as congestion avoidance ack */ |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1384 | tcp_cc_rcv_ack (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1385 | return; |
| 1386 | } |
| 1387 | |
| 1388 | /* |
| 1389 | * Legitimate ACK. 2) If PARTIAL ACK try to retransmit |
| 1390 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1391 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1392 | /* XXX limit this only to first partial ack? */ |
| 1393 | tcp_retransmit_timer_force_update (tc); |
| 1394 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1395 | /* RFC6675: If the incoming ACK is a cumulative acknowledgment, |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1396 | * reset dupacks to 0. Also needed if in congestion recovery */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1397 | tc->rcv_dupacks = 0; |
| 1398 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1399 | /* Post RTO timeout don't try anything fancy */ |
| 1400 | if (tcp_in_recovery (tc)) |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1401 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1402 | tcp_cc_rcv_ack (tc); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1403 | transport_add_tx_event (&tc->connection); |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1404 | return; |
| 1405 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1406 | |
| 1407 | /* Remove retransmitted bytes that have been delivered */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1408 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1409 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1410 | ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv |
| 1411 | >= tc->sack_sb.last_bytes_delivered |
| 1412 | || (tc->flags & TCP_CONN_FINSNT)); |
| 1413 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1414 | /* If we have sacks and we haven't gotten an ack beyond high_rxt, |
| 1415 | * remove sacked bytes delivered */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1416 | if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt)) |
| 1417 | { |
| 1418 | rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv |
| 1419 | - tc->sack_sb.last_bytes_delivered; |
| 1420 | ASSERT (tc->snd_rxt_bytes >= rxt_delivered); |
| 1421 | tc->snd_rxt_bytes -= rxt_delivered; |
| 1422 | } |
| 1423 | else |
| 1424 | { |
| 1425 | /* Apparently all retransmitted holes have been acked */ |
| 1426 | tc->snd_rxt_bytes = 0; |
| 1427 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1428 | } |
| 1429 | else |
| 1430 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1431 | if (tc->snd_rxt_bytes > tc->bytes_acked) |
| 1432 | tc->snd_rxt_bytes -= tc->bytes_acked; |
| 1433 | else |
| 1434 | tc->snd_rxt_bytes = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1435 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1436 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1437 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1438 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1439 | /* |
| 1440 | * Since this was a partial ack, try to retransmit some more data |
| 1441 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1442 | tcp_program_fastretransmit (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1443 | } |
| 1444 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1445 | /** |
| 1446 | * Process incoming ACK |
| 1447 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1448 | static int |
| 1449 | tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1450 | tcp_header_t * th, u32 * next, u32 * error) |
| 1451 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1452 | u32 prev_snd_wnd, prev_snd_una; |
| 1453 | u8 is_dack; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1454 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1455 | TCP_EVT_DBG (TCP_EVT_CC_STAT, tc); |
| 1456 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1457 | /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1458 | 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] | 1459 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1460 | /* When we entered recovery, we reset snd_nxt to snd_una. Seems peer |
| 1461 | * still has the data so accept the ack */ |
| 1462 | if (tcp_in_recovery (tc) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1463 | && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_congestion)) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1464 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1465 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
| 1466 | if (seq_gt (tc->snd_nxt, tc->snd_una_max)) |
| 1467 | tc->snd_una_max = tc->snd_nxt; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1468 | goto process_ack; |
| 1469 | } |
| 1470 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1471 | /* If we have outstanding data and this is within the window, accept it, |
| 1472 | * probably retransmit has timed out. Otherwise ACK segment and then |
| 1473 | * drop it */ |
| 1474 | if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)) |
| 1475 | { |
| 1476 | tcp_make_ack (tc, b); |
| 1477 | *next = tcp_next_output (tc->c_is_ip4); |
| 1478 | *error = TCP_ERROR_ACK_INVALID; |
| 1479 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0, |
| 1480 | vnet_buffer (b)->tcp.ack_number); |
| 1481 | return -1; |
| 1482 | } |
| 1483 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1484 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 2, |
| 1485 | vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1486 | |
| 1487 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
| 1488 | *error = TCP_ERROR_ACK_FUTURE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1489 | } |
| 1490 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1491 | /* If old ACK, probably it's an old dupack */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1492 | 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] | 1493 | { |
| 1494 | *error = TCP_ERROR_ACK_OLD; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1495 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 1, |
| 1496 | vnet_buffer (b)->tcp.ack_number); |
| 1497 | if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1498 | tcp_cc_handle_event (tc, 1); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1499 | /* Don't drop yet */ |
| 1500 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1501 | } |
| 1502 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1503 | /* |
| 1504 | * Looks okay, process feedback |
| 1505 | */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1506 | process_ack: |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1507 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1508 | tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); |
| 1509 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1510 | prev_snd_wnd = tc->snd_wnd; |
| 1511 | prev_snd_una = tc->snd_una; |
| 1512 | tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, |
| 1513 | vnet_buffer (b)->tcp.ack_number, |
| 1514 | clib_net_to_host_u16 (th->window) << tc->snd_wscale); |
| 1515 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
| 1516 | tc->snd_una = vnet_buffer (b)->tcp.ack_number + tc->sack_sb.snd_una_adv; |
| 1517 | tcp_validate_txf_size (tc, tc->bytes_acked); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1518 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1519 | if (tc->bytes_acked) |
| 1520 | tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number); |
| 1521 | |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1522 | TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc); |
| 1523 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1524 | /* |
| 1525 | * Check if we have congestion event |
| 1526 | */ |
| 1527 | |
| 1528 | 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] | 1529 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1530 | tcp_cc_handle_event (tc, is_dack); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1531 | if (!tcp_in_cong_recovery (tc)) |
| 1532 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1533 | *error = TCP_ERROR_ACK_DUP; |
Florin Coras | ca09d07 | 2018-10-01 18:31:02 -0700 | [diff] [blame] | 1534 | if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th)) |
| 1535 | return 0; |
| 1536 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1537 | } |
| 1538 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1539 | /* |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1540 | * Update congestion control (slow start/congestion avoidance) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1541 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1542 | tcp_cc_update (tc, b); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1543 | *error = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1544 | return 0; |
| 1545 | } |
| 1546 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1547 | static u8 |
| 1548 | tcp_sack_vector_is_sane (sack_block_t * sacks) |
| 1549 | { |
| 1550 | int i; |
| 1551 | for (i = 1; i < vec_len (sacks); i++) |
| 1552 | { |
| 1553 | if (sacks[i - 1].end == sacks[i].start) |
| 1554 | return 0; |
| 1555 | } |
| 1556 | return 1; |
| 1557 | } |
| 1558 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1559 | /** |
| 1560 | * Build SACK list as per RFC2018. |
| 1561 | * |
| 1562 | * Makes sure the first block contains the segment that generated the current |
| 1563 | * ACK and the following ones are the ones most recently reported in SACK |
| 1564 | * blocks. |
| 1565 | * |
| 1566 | * @param tc TCP connection for which the SACK list is updated |
| 1567 | * @param start Start sequence number of the newest SACK block |
| 1568 | * @param end End sequence of the newest SACK block |
| 1569 | */ |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1570 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1571 | tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end) |
| 1572 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1573 | sack_block_t *new_list = 0, *block = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1574 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1575 | |
| 1576 | /* If the first segment is ooo add it to the list. Last write might've moved |
| 1577 | * rcv_nxt over the first segment. */ |
| 1578 | if (seq_lt (tc->rcv_nxt, start)) |
| 1579 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1580 | vec_add2 (new_list, block, 1); |
| 1581 | block->start = start; |
| 1582 | block->end = end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1583 | } |
| 1584 | |
| 1585 | /* Find the blocks still worth keeping. */ |
| 1586 | for (i = 0; i < vec_len (tc->snd_sacks); i++) |
| 1587 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1588 | /* Discard if rcv_nxt advanced beyond current block */ |
| 1589 | if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1590 | continue; |
| 1591 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1592 | /* Merge or drop if segment overlapped by the new segment */ |
| 1593 | if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start) |
| 1594 | && seq_leq (tc->snd_sacks[i].start, new_list[0].end))) |
| 1595 | { |
| 1596 | if (seq_lt (tc->snd_sacks[i].start, new_list[0].start)) |
| 1597 | new_list[0].start = tc->snd_sacks[i].start; |
| 1598 | if (seq_lt (new_list[0].end, tc->snd_sacks[i].end)) |
| 1599 | new_list[0].end = tc->snd_sacks[i].end; |
| 1600 | continue; |
| 1601 | } |
| 1602 | |
| 1603 | /* Save to new SACK list if we have space. */ |
| 1604 | if (vec_len (new_list) < TCP_MAX_SACK_BLOCKS) |
| 1605 | { |
| 1606 | vec_add1 (new_list, tc->snd_sacks[i]); |
| 1607 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1608 | else |
| 1609 | { |
| 1610 | clib_warning ("sack discarded"); |
| 1611 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1612 | } |
| 1613 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1614 | ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1615 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1616 | /* Replace old vector with new one */ |
| 1617 | vec_free (tc->snd_sacks); |
| 1618 | tc->snd_sacks = new_list; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1619 | |
| 1620 | /* Segments should not 'touch' */ |
| 1621 | ASSERT (tcp_sack_vector_is_sane (tc->snd_sacks)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1622 | } |
| 1623 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1624 | u32 |
| 1625 | tcp_sack_list_bytes (tcp_connection_t * tc) |
| 1626 | { |
| 1627 | u32 bytes = 0, i; |
| 1628 | for (i = 0; i < vec_len (tc->snd_sacks); i++) |
| 1629 | bytes += tc->snd_sacks[i].end - tc->snd_sacks[i].start; |
| 1630 | return bytes; |
| 1631 | } |
| 1632 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1633 | /** Enqueue data for delivery to application */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1634 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1635 | tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1636 | u16 data_len) |
| 1637 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1638 | int written, error = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1639 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1640 | ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1641 | ASSERT (data_len); |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1642 | written = session_enqueue_stream_connection (&tc->connection, b, 0, |
| 1643 | 1 /* queue event */ , 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1644 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1645 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written); |
| 1646 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1647 | /* Update rcv_nxt */ |
| 1648 | if (PREDICT_TRUE (written == data_len)) |
| 1649 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1650 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1651 | } |
| 1652 | /* If more data written than expected, account for out-of-order bytes. */ |
| 1653 | else if (written > data_len) |
| 1654 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1655 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1656 | |
| 1657 | /* Send ACK confirming the update */ |
| 1658 | tc->flags |= TCP_CONN_SNDACK; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1659 | TCP_EVT_DBG (TCP_EVT_CC_INPUT, tc, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1660 | } |
| 1661 | else if (written > 0) |
| 1662 | { |
| 1663 | /* We've written something but FIFO is probably full now */ |
| 1664 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1665 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1666 | /* Depending on how fast the app is, all remaining buffers in burst will |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1667 | * not be enqueued. Inform peer */ |
| 1668 | tc->flags |= TCP_CONN_SNDACK; |
| 1669 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1670 | error = TCP_ERROR_PARTIALLY_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1671 | } |
| 1672 | else |
| 1673 | { |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1674 | tc->flags |= TCP_CONN_SNDACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1675 | return TCP_ERROR_FIFO_FULL; |
| 1676 | } |
| 1677 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1678 | /* Update SACK list if need be */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1679 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1680 | { |
| 1681 | /* Remove SACK blocks that have been delivered */ |
| 1682 | tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); |
| 1683 | } |
| 1684 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1685 | return error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1686 | } |
| 1687 | |
| 1688 | /** Enqueue out-of-order data */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1689 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1690 | tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1691 | u16 data_len) |
| 1692 | { |
| 1693 | stream_session_t *s0; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1694 | int rv, offset; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1695 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1696 | ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1697 | ASSERT (data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1698 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1699 | /* Enqueue out-of-order data with relative offset */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1700 | rv = session_enqueue_stream_connection (&tc->connection, b, |
| 1701 | vnet_buffer (b)->tcp.seq_number - |
| 1702 | tc->rcv_nxt, 0 /* queue event */ , |
| 1703 | 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1704 | |
| 1705 | /* Nothing written */ |
| 1706 | if (rv) |
| 1707 | { |
| 1708 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0); |
| 1709 | return TCP_ERROR_FIFO_FULL; |
| 1710 | } |
| 1711 | |
| 1712 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1713 | |
| 1714 | /* Update SACK list if in use */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1715 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1716 | { |
| 1717 | ooo_segment_t *newest; |
| 1718 | u32 start, end; |
| 1719 | |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1720 | s0 = session_get (tc->c_s_index, tc->c_thread_index); |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1721 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1722 | /* Get the newest segment from the fifo */ |
| 1723 | newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1724 | if (newest) |
| 1725 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1726 | offset = ooo_segment_offset (s0->server_rx_fifo, newest); |
| 1727 | ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); |
| 1728 | start = tc->rcv_nxt + offset; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1729 | end = start + ooo_segment_length (s0->server_rx_fifo, newest); |
| 1730 | tcp_update_sack_list (tc, start, end); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1731 | svm_fifo_newest_ooo_segment_reset (s0->server_rx_fifo); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1732 | TCP_EVT_DBG (TCP_EVT_CC_SACKS, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1733 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1734 | } |
| 1735 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1736 | return TCP_ERROR_ENQUEUED_OOO; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1740 | * Check if ACK could be delayed. If ack can be delayed, it should return |
| 1741 | * true for a full frame. If we're always acking return 0. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1742 | */ |
| 1743 | always_inline int |
| 1744 | tcp_can_delack (tcp_connection_t * tc) |
| 1745 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1746 | /* Send ack if ... */ |
| 1747 | if (TCP_ALWAYS_ACK |
| 1748 | /* just sent a rcv wnd 0 */ |
| 1749 | || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0 |
| 1750 | /* constrained to send ack */ |
| 1751 | || (tc->flags & TCP_CONN_SNDACK) != 0 |
| 1752 | /* we're almost out of tx wnd */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1753 | || tcp_available_cc_snd_space (tc) < 4 * tc->snd_mss) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1754 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1755 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1756 | return 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1757 | } |
| 1758 | |
| 1759 | static int |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1760 | tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) |
| 1761 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1762 | u32 discard, first = b->current_length; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1763 | vlib_main_t *vm = vlib_get_main (); |
| 1764 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1765 | /* Handle multi-buffer segments */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1766 | if (n_bytes_to_drop > b->current_length) |
| 1767 | { |
| 1768 | if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1769 | return -1; |
| 1770 | do |
| 1771 | { |
| 1772 | discard = clib_min (n_bytes_to_drop, b->current_length); |
| 1773 | vlib_buffer_advance (b, discard); |
| 1774 | b = vlib_get_buffer (vm, b->next_buffer); |
| 1775 | n_bytes_to_drop -= discard; |
| 1776 | } |
| 1777 | while (n_bytes_to_drop); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1778 | if (n_bytes_to_drop > first) |
| 1779 | b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1780 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1781 | else |
| 1782 | vlib_buffer_advance (b, n_bytes_to_drop); |
| 1783 | vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1784 | return 0; |
| 1785 | } |
| 1786 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1787 | /** |
| 1788 | * Receive buffer for connection and handle acks |
| 1789 | * |
| 1790 | * It handles both in order or out-of-order data. |
| 1791 | */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1792 | static int |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1793 | tcp_segment_rcv (tcp_connection_t * tc, vlib_buffer_t * b, u32 * next0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1794 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1795 | u32 error, n_bytes_to_drop, n_data_bytes; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1796 | |
| 1797 | vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); |
| 1798 | n_data_bytes = vnet_buffer (b)->tcp.data_len; |
| 1799 | ASSERT (n_data_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1800 | |
| 1801 | /* Handle out-of-order data */ |
| 1802 | if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) |
| 1803 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1804 | /* Old sequence numbers allowed through because they overlapped |
| 1805 | * the rx window */ |
| 1806 | if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1807 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1808 | /* Completely in the past (possible retransmit). Ack |
| 1809 | * retransmissions since we may not have any data to send */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1810 | if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1811 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1812 | tcp_make_ack (tc, b); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1813 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1814 | *next0 = tcp_next_output (tc->c_is_ip4); |
| 1815 | goto done; |
| 1816 | } |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1817 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1818 | /* Chop off the bytes in the past and see if what is left |
| 1819 | * can be enqueued in order */ |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1820 | n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; |
| 1821 | n_data_bytes -= n_bytes_to_drop; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1822 | vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1823 | if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1824 | { |
| 1825 | error = TCP_ERROR_SEGMENT_OLD; |
| 1826 | *next0 = tcp_next_drop (tc->c_is_ip4); |
| 1827 | goto done; |
| 1828 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1829 | goto in_order; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1830 | } |
| 1831 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1832 | /* RFC2581: Enqueue and send DUPACK for fast retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1833 | error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1834 | *next0 = tcp_next_output (tc->c_is_ip4); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1835 | tcp_make_ack (tc, b); |
| 1836 | vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1837 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1838 | goto done; |
| 1839 | } |
| 1840 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1841 | in_order: |
| 1842 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1843 | /* In order data, enqueue. Fifo figures out by itself if any out-of-order |
| 1844 | * segments can be enqueued after fifo tail offset changes. */ |
| 1845 | error = tcp_session_enqueue_data (tc, b, n_data_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1846 | if (tcp_can_delack (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1847 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1848 | *next0 = tcp_next_drop (tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1849 | if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)) |
| 1850 | tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1851 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1852 | } |
| 1853 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1854 | *next0 = tcp_next_output (tc->c_is_ip4); |
| 1855 | tcp_make_ack (tc, b); |
| 1856 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1857 | done: |
| 1858 | return error; |
| 1859 | } |
| 1860 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1861 | typedef struct |
| 1862 | { |
| 1863 | tcp_header_t tcp_header; |
| 1864 | tcp_connection_t tcp_connection; |
| 1865 | } tcp_rx_trace_t; |
| 1866 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1867 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1868 | format_tcp_rx_trace (u8 * s, va_list * args) |
| 1869 | { |
| 1870 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1871 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1872 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 1873 | u32 indent = format_get_indent (s); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1874 | |
| 1875 | s = format (s, "%U\n%U%U", |
| 1876 | format_tcp_header, &t->tcp_header, 128, |
| 1877 | format_white_space, indent, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1878 | format_tcp_connection, &t->tcp_connection, 1); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1879 | |
| 1880 | return s; |
| 1881 | } |
| 1882 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1883 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1884 | format_tcp_rx_trace_short (u8 * s, va_list * args) |
| 1885 | { |
| 1886 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1887 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1888 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1889 | |
| 1890 | s = format (s, "%d -> %d (%U)", |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1891 | clib_net_to_host_u16 (t->tcp_header.dst_port), |
| 1892 | 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] | 1893 | t->tcp_connection.state); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1894 | |
| 1895 | return s; |
| 1896 | } |
| 1897 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1898 | static void |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1899 | tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, |
| 1900 | tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) |
| 1901 | { |
| 1902 | if (tc0) |
| 1903 | { |
| 1904 | clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection)); |
| 1905 | } |
| 1906 | else |
| 1907 | { |
| 1908 | th0 = tcp_buffer_hdr (b0); |
| 1909 | } |
| 1910 | clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
| 1911 | } |
| 1912 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1913 | static void |
| 1914 | tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1915 | vlib_frame_t * frame, u8 is_ip4) |
| 1916 | { |
| 1917 | u32 *from, n_left; |
| 1918 | |
| 1919 | n_left = frame->n_vectors; |
| 1920 | from = vlib_frame_vector_args (frame); |
| 1921 | |
| 1922 | while (n_left >= 1) |
| 1923 | { |
| 1924 | tcp_connection_t *tc0; |
| 1925 | tcp_rx_trace_t *t0; |
| 1926 | tcp_header_t *th0; |
| 1927 | vlib_buffer_t *b0; |
| 1928 | u32 bi0; |
| 1929 | |
| 1930 | bi0 = from[0]; |
| 1931 | b0 = vlib_get_buffer (vm, bi0); |
| 1932 | |
| 1933 | if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| 1934 | { |
| 1935 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 1936 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 1937 | vm->thread_index); |
| 1938 | th0 = tcp_buffer_hdr (b0); |
| 1939 | tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); |
| 1940 | } |
| 1941 | |
| 1942 | from += 1; |
| 1943 | n_left -= 1; |
| 1944 | } |
| 1945 | } |
| 1946 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1947 | always_inline void |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1948 | tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node, |
| 1949 | u8 is_ip4, u32 evt, u32 val) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1950 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1951 | if (is_ip4) |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1952 | vlib_node_increment_counter (vm, tcp4_node, evt, val); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1953 | else |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1954 | vlib_node_increment_counter (vm, tcp6_node, evt, val); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1955 | } |
| 1956 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1957 | #define tcp_maybe_inc_counter(node_id, err, count) \ |
| 1958 | { \ |
| 1959 | if (next0 != tcp_next_drop (is_ip4)) \ |
| 1960 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 1961 | tcp6_##node_id##_node.index, is_ip4, err, \ |
| 1962 | 1); \ |
| 1963 | } |
| 1964 | #define tcp_inc_counter(node_id, err, count) \ |
| 1965 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 1966 | tcp6_##node_id##_node.index, is_ip4, \ |
| 1967 | err, count) |
| 1968 | #define tcp_maybe_inc_err_counter(cnts, err) \ |
| 1969 | { \ |
| 1970 | cnts[err] += (next0 != tcp_next_drop (is_ip4)); \ |
| 1971 | } |
| 1972 | #define tcp_inc_err_counter(cnts, err, val) \ |
| 1973 | { \ |
| 1974 | cnts[err] += val; \ |
| 1975 | } |
| 1976 | #define tcp_store_err_counters(node_id, cnts) \ |
| 1977 | { \ |
| 1978 | int i; \ |
| 1979 | for (i = 0; i < TCP_N_ERROR; i++) \ |
| 1980 | if (cnts[i]) \ |
| 1981 | tcp_inc_counter(node_id, i, cnts[i]); \ |
| 1982 | } |
| 1983 | |
| 1984 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1985 | always_inline uword |
| 1986 | tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1987 | vlib_frame_t * frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1988 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1989 | u32 thread_index = vm->thread_index, errors = 0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1990 | u32 n_left_from, next_index, *from, *to_next; |
| 1991 | u16 err_counters[TCP_N_ERROR] = { 0 }; |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 1992 | u8 is_fin = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1993 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1994 | if (node->flags & VLIB_NODE_FLAG_TRACE) |
| 1995 | tcp_established_trace_frame (vm, node, frame, is_ip4); |
| 1996 | |
| 1997 | from = vlib_frame_vector_args (frame); |
| 1998 | n_left_from = frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1999 | next_index = node->cached_next_index; |
| 2000 | |
| 2001 | while (n_left_from > 0) |
| 2002 | { |
| 2003 | u32 n_left_to_next; |
| 2004 | |
| 2005 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2006 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2007 | { |
| 2008 | u32 bi0; |
| 2009 | vlib_buffer_t *b0; |
| 2010 | tcp_header_t *th0 = 0; |
| 2011 | tcp_connection_t *tc0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2012 | u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2013 | |
Florin Coras | 81a13db | 2018-03-16 08:48:31 -0700 | [diff] [blame] | 2014 | if (n_left_from > 1) |
| 2015 | { |
| 2016 | vlib_buffer_t *pb; |
| 2017 | pb = vlib_get_buffer (vm, from[1]); |
| 2018 | vlib_prefetch_buffer_header (pb, LOAD); |
| 2019 | CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 2020 | } |
| 2021 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2022 | bi0 = from[0]; |
| 2023 | to_next[0] = bi0; |
| 2024 | from += 1; |
| 2025 | to_next += 1; |
| 2026 | n_left_from -= 1; |
| 2027 | n_left_to_next -= 1; |
| 2028 | |
| 2029 | b0 = vlib_get_buffer (vm, bi0); |
| 2030 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2031 | thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2032 | |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2033 | if (PREDICT_FALSE (tc0 == 0)) |
| 2034 | { |
| 2035 | error0 = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2036 | goto done; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2037 | } |
| 2038 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2039 | th0 = tcp_buffer_hdr (b0); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2040 | /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a |
| 2041 | * dangling reference. */ |
| 2042 | is_fin = tcp_is_fin (th0); |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 2043 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2044 | /* SYNs, FINs and data consume sequence numbers */ |
| 2045 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2046 | + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2047 | |
| 2048 | /* TODO header prediction fast path */ |
| 2049 | |
| 2050 | /* 1-4: check SEQ, RST, SYN */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2051 | if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0, |
| 2052 | &error0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2053 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2054 | tcp_maybe_inc_err_counter (err_counters, error0); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 2055 | TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2056 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2057 | } |
| 2058 | |
| 2059 | /* 5: check the ACK field */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2060 | if (PREDICT_FALSE (tcp_rcv_ack (tc0, b0, th0, &next0, &error0))) |
| 2061 | { |
| 2062 | tcp_maybe_inc_err_counter (err_counters, error0); |
| 2063 | goto done; |
| 2064 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2065 | |
| 2066 | /* 6: check the URG bit TODO */ |
| 2067 | |
| 2068 | /* 7: process the segment text */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2069 | if (vnet_buffer (b0)->tcp.data_len) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2070 | { |
| 2071 | error0 = tcp_segment_rcv (tc0, b0, &next0); |
| 2072 | tcp_maybe_inc_err_counter (err_counters, error0); |
| 2073 | } |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 2074 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2075 | /* 8: check the FIN bit */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2076 | if (PREDICT_FALSE (is_fin)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2077 | { |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2078 | /* Enter CLOSE-WAIT and notify session. To avoid lingering |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2079 | * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2080 | /* Account for the FIN if nothing else was received */ |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2081 | if (vnet_buffer (b0)->tcp.data_len == 0) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2082 | tc0->rcv_nxt += 1; |
| 2083 | tcp_make_ack (tc0, b0); |
| 2084 | next0 = tcp_next_output (tc0->c_is_ip4); |
| 2085 | tc0->state = TCP_STATE_CLOSE_WAIT; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2086 | stream_session_disconnect_notify (&tc0->connection); |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2087 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2088 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2089 | tcp_inc_err_counter (err_counters, TCP_ERROR_FIN_RCVD, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2090 | } |
| 2091 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2092 | done: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2093 | b0->error = node->errors[error0]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2094 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2095 | n_left_to_next, bi0, next0); |
| 2096 | } |
| 2097 | |
| 2098 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2099 | } |
| 2100 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2101 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2102 | thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2103 | err_counters[TCP_ERROR_EVENT_FIFO_FULL] = errors; |
| 2104 | tcp_store_err_counters (established, err_counters); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2105 | tcp_flush_frame_to_output (vm, thread_index, is_ip4); |
| 2106 | |
| 2107 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2108 | } |
| 2109 | |
| 2110 | static uword |
| 2111 | tcp4_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2112 | vlib_frame_t * from_frame) |
| 2113 | { |
| 2114 | return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2115 | } |
| 2116 | |
| 2117 | static uword |
| 2118 | tcp6_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2119 | vlib_frame_t * from_frame) |
| 2120 | { |
| 2121 | return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2122 | } |
| 2123 | |
| 2124 | /* *INDENT-OFF* */ |
| 2125 | VLIB_REGISTER_NODE (tcp4_established_node) = |
| 2126 | { |
| 2127 | .function = tcp4_established, |
| 2128 | .name = "tcp4-established", |
| 2129 | /* Takes a vector of packets. */ |
| 2130 | .vector_size = sizeof (u32), |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2131 | .n_errors = TCP_N_ERROR, |
| 2132 | .error_strings = tcp_error_strings, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2133 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 2134 | .next_nodes = |
| 2135 | { |
| 2136 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 2137 | foreach_tcp_state_next |
| 2138 | #undef _ |
| 2139 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2140 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2141 | }; |
| 2142 | /* *INDENT-ON* */ |
| 2143 | |
| 2144 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_established_node, tcp4_established); |
| 2145 | |
| 2146 | /* *INDENT-OFF* */ |
| 2147 | VLIB_REGISTER_NODE (tcp6_established_node) = |
| 2148 | { |
| 2149 | .function = tcp6_established, |
| 2150 | .name = "tcp6-established", |
| 2151 | /* Takes a vector of packets. */ |
| 2152 | .vector_size = sizeof (u32), |
| 2153 | .n_errors = TCP_N_ERROR, |
| 2154 | .error_strings = tcp_error_strings, |
| 2155 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 2156 | .next_nodes = |
| 2157 | { |
| 2158 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 2159 | foreach_tcp_state_next |
| 2160 | #undef _ |
| 2161 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2162 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2163 | }; |
| 2164 | /* *INDENT-ON* */ |
| 2165 | |
| 2166 | |
| 2167 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established); |
| 2168 | |
| 2169 | vlib_node_registration_t tcp4_syn_sent_node; |
| 2170 | vlib_node_registration_t tcp6_syn_sent_node; |
| 2171 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2172 | static u8 |
| 2173 | tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) |
| 2174 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2175 | transport_connection_t *tmp = 0; |
| 2176 | u64 handle; |
| 2177 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2178 | if (!tc) |
| 2179 | return 1; |
| 2180 | |
Florin Coras | 7013113 | 2017-11-27 02:43:30 -0800 | [diff] [blame] | 2181 | /* Proxy case */ |
| 2182 | if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) |
| 2183 | return 1; |
| 2184 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2185 | u8 is_valid = (tc->c_lcl_port == hdr->dst_port |
| 2186 | && (tc->state == TCP_STATE_LISTEN |
| 2187 | || tc->c_rmt_port == hdr->src_port)); |
| 2188 | |
| 2189 | if (!is_valid) |
| 2190 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2191 | handle = session_lookup_half_open_handle (&tc->connection); |
| 2192 | tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF, |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2193 | tc->c_proto, tc->c_is_ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2194 | |
| 2195 | if (tmp) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2196 | { |
| 2197 | if (tmp->lcl_port == hdr->dst_port |
| 2198 | && tmp->rmt_port == hdr->src_port) |
| 2199 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2200 | TCP_DBG ("half-open is valid!"); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2201 | } |
| 2202 | } |
| 2203 | } |
| 2204 | return is_valid; |
| 2205 | } |
| 2206 | |
| 2207 | /** |
| 2208 | * Lookup transport connection |
| 2209 | */ |
| 2210 | static tcp_connection_t * |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2211 | tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, |
| 2212 | u8 is_ip4) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2213 | { |
| 2214 | tcp_header_t *tcp; |
| 2215 | transport_connection_t *tconn; |
| 2216 | tcp_connection_t *tc; |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2217 | u8 is_filtered = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2218 | if (is_ip4) |
| 2219 | { |
| 2220 | ip4_header_t *ip4; |
| 2221 | ip4 = vlib_buffer_get_current (b); |
| 2222 | tcp = ip4_next_header (ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2223 | tconn = session_lookup_connection_wt4 (fib_index, |
| 2224 | &ip4->dst_address, |
| 2225 | &ip4->src_address, |
| 2226 | tcp->dst_port, |
| 2227 | tcp->src_port, |
| 2228 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2229 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2230 | tc = tcp_get_connection_from_transport (tconn); |
| 2231 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 2232 | } |
| 2233 | else |
| 2234 | { |
| 2235 | ip6_header_t *ip6; |
| 2236 | ip6 = vlib_buffer_get_current (b); |
| 2237 | tcp = ip6_next_header (ip6); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2238 | tconn = session_lookup_connection_wt6 (fib_index, |
| 2239 | &ip6->dst_address, |
| 2240 | &ip6->src_address, |
| 2241 | tcp->dst_port, |
| 2242 | tcp->src_port, |
| 2243 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2244 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2245 | tc = tcp_get_connection_from_transport (tconn); |
| 2246 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 2247 | } |
| 2248 | return tc; |
| 2249 | } |
| 2250 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2251 | always_inline uword |
| 2252 | tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2253 | vlib_frame_t * from_frame, int is_ip4) |
| 2254 | { |
| 2255 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 2256 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2257 | u32 my_thread_index = vm->thread_index, errors = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2258 | |
| 2259 | from = vlib_frame_vector_args (from_frame); |
| 2260 | n_left_from = from_frame->n_vectors; |
| 2261 | |
| 2262 | next_index = node->cached_next_index; |
| 2263 | |
| 2264 | while (n_left_from > 0) |
| 2265 | { |
| 2266 | u32 n_left_to_next; |
| 2267 | |
| 2268 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2269 | |
| 2270 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2271 | { |
| 2272 | u32 bi0, ack0, seq0; |
| 2273 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2274 | tcp_rx_trace_t *t0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2275 | tcp_header_t *tcp0 = 0; |
| 2276 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2277 | tcp_connection_t *new_tc0; |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 2278 | u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2279 | |
| 2280 | bi0 = from[0]; |
| 2281 | to_next[0] = bi0; |
| 2282 | from += 1; |
| 2283 | to_next += 1; |
| 2284 | n_left_from -= 1; |
| 2285 | n_left_to_next -= 1; |
| 2286 | |
| 2287 | b0 = vlib_get_buffer (vm, bi0); |
| 2288 | tc0 = |
| 2289 | tcp_half_open_connection_get (vnet_buffer (b0)-> |
| 2290 | tcp.connection_index); |
Dave Barach | d84ba85 | 2017-08-22 17:56:46 -0400 | [diff] [blame] | 2291 | if (PREDICT_FALSE (tc0 == 0)) |
| 2292 | { |
| 2293 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2294 | goto drop; |
| 2295 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2296 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2297 | /* Half-open completed recently but the connection was't removed |
| 2298 | * yet by the owning thread */ |
| 2299 | if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) |
| 2300 | { |
| 2301 | /* Make sure the connection actually exists */ |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2302 | ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0, |
| 2303 | my_thread_index, is_ip4)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2304 | goto drop; |
| 2305 | } |
| 2306 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2307 | ack0 = vnet_buffer (b0)->tcp.ack_number; |
| 2308 | seq0 = vnet_buffer (b0)->tcp.seq_number; |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2309 | tcp0 = tcp_buffer_hdr (b0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2310 | |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2311 | /* Crude check to see if the connection handle does not match |
| 2312 | * the packet. Probably connection just switched to established */ |
| 2313 | if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port |
| 2314 | || tcp0->src_port != tc0->c_rmt_port)) |
| 2315 | goto drop; |
| 2316 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2317 | if (PREDICT_FALSE |
| 2318 | (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0))) |
| 2319 | goto drop; |
| 2320 | |
| 2321 | /* SYNs, FINs and data consume sequence numbers */ |
| 2322 | vnet_buffer (b0)->tcp.seq_end = seq0 + tcp_is_syn (tcp0) |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2323 | + tcp_is_fin (tcp0) + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2324 | |
| 2325 | /* |
| 2326 | * 1. check the ACK bit |
| 2327 | */ |
| 2328 | |
| 2329 | /* |
| 2330 | * If the ACK bit is set |
| 2331 | * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless |
| 2332 | * the RST bit is set, if so drop the segment and return) |
| 2333 | * <SEQ=SEG.ACK><CTL=RST> |
| 2334 | * and discard the segment. Return. |
| 2335 | * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. |
| 2336 | */ |
| 2337 | if (tcp_ack (tcp0)) |
| 2338 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2339 | if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2340 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2341 | clib_warning ("ack not in rcv wnd"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2342 | if (!tcp_rst (tcp0)) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2343 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2344 | goto drop; |
| 2345 | } |
| 2346 | |
| 2347 | /* Make sure ACK is valid */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2348 | if (seq_gt (tc0->snd_una, ack0)) |
| 2349 | { |
| 2350 | clib_warning ("ack invalid"); |
| 2351 | goto drop; |
| 2352 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2353 | } |
| 2354 | |
| 2355 | /* |
| 2356 | * 2. check the RST bit |
| 2357 | */ |
| 2358 | |
| 2359 | if (tcp_rst (tcp0)) |
| 2360 | { |
| 2361 | /* If ACK is acceptable, signal client that peer is not |
| 2362 | * willing to accept connection and drop connection*/ |
| 2363 | if (tcp_ack (tcp0)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2364 | tcp_connection_reset (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2365 | goto drop; |
| 2366 | } |
| 2367 | |
| 2368 | /* |
| 2369 | * 3. check the security and precedence (skipped) |
| 2370 | */ |
| 2371 | |
| 2372 | /* |
| 2373 | * 4. check the SYN bit |
| 2374 | */ |
| 2375 | |
| 2376 | /* No SYN flag. Drop. */ |
| 2377 | if (!tcp_syn (tcp0)) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2378 | { |
| 2379 | clib_warning ("not synack"); |
| 2380 | goto drop; |
| 2381 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2382 | |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2383 | /* Parse options */ |
| 2384 | if (tcp_options_parse (tcp0, &tc0->rcv_opts)) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2385 | { |
| 2386 | clib_warning ("options parse fail"); |
| 2387 | goto drop; |
| 2388 | } |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2389 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2390 | /* Valid SYN or SYN-ACK. Move connection from half-open pool to |
| 2391 | * current thread pool. */ |
| 2392 | pool_get (tm->connections[my_thread_index], new_tc0); |
| 2393 | clib_memcpy (new_tc0, tc0, sizeof (*new_tc0)); |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 2394 | new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index]; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2395 | new_tc0->c_thread_index = my_thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2396 | new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; |
| 2397 | new_tc0->irs = seq0; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2398 | new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; |
| 2399 | new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = |
| 2400 | TCP_TIMER_HANDLE_INVALID; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2401 | new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2402 | |
| 2403 | /* If this is not the owning thread, wait for syn retransmit to |
| 2404 | * expire and cleanup then */ |
| 2405 | if (tcp_half_open_connection_cleanup (tc0)) |
| 2406 | tc0->flags |= TCP_CONN_HALF_OPEN_DONE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2407 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2408 | if (tcp_opts_tstamp (&new_tc0->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2409 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2410 | new_tc0->tsval_recent = new_tc0->rcv_opts.tsval; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2411 | new_tc0->tsval_recent_age = tcp_time_now (); |
| 2412 | } |
| 2413 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2414 | if (tcp_opts_wscale (&new_tc0->rcv_opts)) |
| 2415 | new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2416 | |
Florin Coras | 45ca73f | 2018-09-27 09:19:29 -0700 | [diff] [blame] | 2417 | new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
| 2418 | << new_tc0->snd_wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2419 | new_tc0->snd_wl1 = seq0; |
| 2420 | new_tc0->snd_wl2 = ack0; |
| 2421 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2422 | tcp_connection_init_vars (new_tc0); |
| 2423 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2424 | /* SYN-ACK: See if we can switch to ESTABLISHED state */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2425 | if (PREDICT_TRUE (tcp_ack (tcp0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2426 | { |
| 2427 | /* Our SYN is ACKed: we have iss < ack = snd_una */ |
| 2428 | |
| 2429 | /* TODO Dequeue acknowledged segments if we support Fast Open */ |
| 2430 | new_tc0->snd_una = ack0; |
| 2431 | new_tc0->state = TCP_STATE_ESTABLISHED; |
| 2432 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2433 | /* Make sure las is initialized for the wnd computation */ |
| 2434 | new_tc0->rcv_las = new_tc0->rcv_nxt; |
| 2435 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2436 | /* Notify app that we have connection. If session layer can't |
| 2437 | * allocate session send reset */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2438 | if (session_stream_connect_notify (&new_tc0->connection, 0)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2439 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2440 | clib_warning ("connect notify fail"); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2441 | tcp_send_reset_w_pkt (new_tc0, b0, is_ip4); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2442 | tcp_connection_cleanup (new_tc0); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2443 | goto drop; |
| 2444 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2445 | |
| 2446 | /* Make sure after data segment processing ACK is sent */ |
| 2447 | new_tc0->flags |= TCP_CONN_SNDACK; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2448 | |
| 2449 | /* Update rtt with the syn-ack sample */ |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2450 | tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2451 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2452 | } |
| 2453 | /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ |
| 2454 | else |
| 2455 | { |
| 2456 | new_tc0->state = TCP_STATE_SYN_RCVD; |
| 2457 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2458 | /* Notify app that we have connection */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2459 | if (session_stream_connect_notify (&new_tc0->connection, 0)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2460 | { |
| 2461 | tcp_connection_cleanup (new_tc0); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2462 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2463 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2464 | goto drop; |
| 2465 | } |
| 2466 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2467 | tc0->rtt_ts = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2468 | tcp_init_snd_vars (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2469 | tcp_make_synack (new_tc0, b0); |
| 2470 | next0 = tcp_next_output (is_ip4); |
| 2471 | |
| 2472 | goto drop; |
| 2473 | } |
| 2474 | |
| 2475 | /* Read data, if any */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2476 | if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2477 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2478 | clib_warning ("rcvd data in syn-sent"); |
| 2479 | error0 = tcp_segment_rcv (new_tc0, b0, &next0); |
| 2480 | if (error0 == TCP_ERROR_ACK_OK) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2481 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2482 | tcp_maybe_inc_counter (syn_sent, error0, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2483 | } |
| 2484 | else |
| 2485 | { |
| 2486 | tcp_make_ack (new_tc0, b0); |
| 2487 | next0 = tcp_next_output (new_tc0->c_is_ip4); |
| 2488 | } |
| 2489 | |
| 2490 | drop: |
| 2491 | |
| 2492 | b0->error = error0 ? node->errors[error0] : 0; |
Chris Luke | 879ace3 | 2017-09-26 13:15:16 -0400 | [diff] [blame] | 2493 | if (PREDICT_FALSE |
| 2494 | ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2495 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2496 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2497 | clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header)); |
| 2498 | clib_memcpy (&t0->tcp_connection, tc0, |
| 2499 | sizeof (t0->tcp_connection)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2500 | } |
| 2501 | |
| 2502 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2503 | n_left_to_next, bi0, next0); |
| 2504 | } |
| 2505 | |
| 2506 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2507 | } |
| 2508 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2509 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 2510 | my_thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2511 | tcp_inc_counter (syn_sent, TCP_ERROR_EVENT_FIFO_FULL, errors); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2512 | return from_frame->n_vectors; |
| 2513 | } |
| 2514 | |
| 2515 | static uword |
| 2516 | tcp4_syn_sent (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2517 | vlib_frame_t * from_frame) |
| 2518 | { |
| 2519 | return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2520 | } |
| 2521 | |
| 2522 | static uword |
| 2523 | tcp6_syn_sent_rcv (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2524 | vlib_frame_t * from_frame) |
| 2525 | { |
| 2526 | return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2527 | } |
| 2528 | |
| 2529 | /* *INDENT-OFF* */ |
| 2530 | VLIB_REGISTER_NODE (tcp4_syn_sent_node) = |
| 2531 | { |
| 2532 | .function = tcp4_syn_sent, |
| 2533 | .name = "tcp4-syn-sent", |
| 2534 | /* Takes a vector of packets. */ |
| 2535 | .vector_size = sizeof (u32), |
| 2536 | .n_errors = TCP_N_ERROR, |
| 2537 | .error_strings = tcp_error_strings, |
| 2538 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2539 | .next_nodes = |
| 2540 | { |
| 2541 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2542 | foreach_tcp_state_next |
| 2543 | #undef _ |
| 2544 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2545 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2546 | }; |
| 2547 | /* *INDENT-ON* */ |
| 2548 | |
| 2549 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_syn_sent_node, tcp4_syn_sent); |
| 2550 | |
| 2551 | /* *INDENT-OFF* */ |
| 2552 | VLIB_REGISTER_NODE (tcp6_syn_sent_node) = |
| 2553 | { |
| 2554 | .function = tcp6_syn_sent_rcv, |
| 2555 | .name = "tcp6-syn-sent", |
| 2556 | /* Takes a vector of packets. */ |
| 2557 | .vector_size = sizeof (u32), |
| 2558 | .n_errors = TCP_N_ERROR, |
| 2559 | .error_strings = tcp_error_strings, |
| 2560 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2561 | .next_nodes = |
| 2562 | { |
| 2563 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2564 | foreach_tcp_state_next |
| 2565 | #undef _ |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2566 | }, |
| 2567 | .format_trace = format_tcp_rx_trace_short, |
| 2568 | }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2569 | /* *INDENT-ON* */ |
| 2570 | |
| 2571 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2572 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2573 | vlib_node_registration_t tcp4_rcv_process_node; |
| 2574 | vlib_node_registration_t tcp6_rcv_process_node; |
| 2575 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2576 | /** |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2577 | * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2578 | * as per RFC793 p. 64 |
| 2579 | */ |
| 2580 | always_inline uword |
| 2581 | tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2582 | vlib_frame_t * from_frame, int is_ip4) |
| 2583 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2584 | u32 n_left_from, next_index, *from, *to_next, n_fins = 0; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2585 | u32 my_thread_index = vm->thread_index, errors = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2586 | |
| 2587 | from = vlib_frame_vector_args (from_frame); |
| 2588 | n_left_from = from_frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2589 | next_index = node->cached_next_index; |
| 2590 | |
| 2591 | while (n_left_from > 0) |
| 2592 | { |
| 2593 | u32 n_left_to_next; |
| 2594 | |
| 2595 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2596 | |
| 2597 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2598 | { |
| 2599 | u32 bi0; |
| 2600 | vlib_buffer_t *b0; |
| 2601 | tcp_header_t *tcp0 = 0; |
| 2602 | tcp_connection_t *tc0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2603 | u32 next0 = tcp_next_drop (is_ip4), error0 = TCP_ERROR_NONE; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2604 | u8 is_fin0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2605 | |
| 2606 | bi0 = from[0]; |
| 2607 | to_next[0] = bi0; |
| 2608 | from += 1; |
| 2609 | to_next += 1; |
| 2610 | n_left_from -= 1; |
| 2611 | n_left_to_next -= 1; |
| 2612 | |
| 2613 | b0 = vlib_get_buffer (vm, bi0); |
| 2614 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2615 | my_thread_index); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2616 | if (PREDICT_FALSE (tc0 == 0)) |
| 2617 | { |
| 2618 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2619 | goto drop; |
| 2620 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2621 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2622 | tcp0 = tcp_buffer_hdr (b0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2623 | is_fin0 = tcp_is_fin (tcp0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2624 | |
| 2625 | /* SYNs, FINs and data consume sequence numbers */ |
| 2626 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2627 | + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2628 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2629 | if (CLIB_DEBUG) |
| 2630 | { |
| 2631 | tcp_connection_t *tmp; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2632 | tmp = tcp_lookup_connection (tc0->c_fib_index, b0, |
| 2633 | my_thread_index, is_ip4); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2634 | if (tmp->state != tc0->state) |
| 2635 | { |
| 2636 | clib_warning ("state changed"); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2637 | goto drop; |
| 2638 | } |
| 2639 | } |
| 2640 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2641 | /* |
| 2642 | * Special treatment for CLOSED |
| 2643 | */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2644 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2645 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2646 | error0 = TCP_ERROR_CONNECTION_CLOSED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2647 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2648 | } |
| 2649 | |
| 2650 | /* |
| 2651 | * For all other states (except LISTEN) |
| 2652 | */ |
| 2653 | |
| 2654 | /* 1-4: check SEQ, RST, SYN */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2655 | if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0, |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2656 | &next0, &error0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2657 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2658 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2659 | goto drop; |
| 2660 | } |
| 2661 | |
| 2662 | /* 5: check the ACK field */ |
| 2663 | switch (tc0->state) |
| 2664 | { |
| 2665 | case TCP_STATE_SYN_RCVD: |
| 2666 | /* |
| 2667 | * If the segment acknowledgment is not acceptable, form a |
| 2668 | * reset segment, |
| 2669 | * <SEQ=SEG.ACK><CTL=RST> |
| 2670 | * and send it. |
| 2671 | */ |
| 2672 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
| 2673 | { |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2674 | TCP_DBG ("connection not accepted"); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2675 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2676 | error0 = TCP_ERROR_ACK_INVALID; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2677 | goto drop; |
| 2678 | } |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 2679 | |
| 2680 | /* Update rtt and rto */ |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 2681 | tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number); |
| 2682 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2683 | /* Switch state to ESTABLISHED */ |
| 2684 | tc0->state = TCP_STATE_ESTABLISHED; |
Florin Coras | b384b54 | 2018-01-15 01:08:33 -0800 | [diff] [blame] | 2685 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2686 | |
| 2687 | /* Initialize session variables */ |
| 2688 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2689 | tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2690 | << tc0->rcv_opts.wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2691 | tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 2692 | tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2693 | |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2694 | /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2695 | tcp_retransmit_timer_reset (tc0); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2696 | tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); |
Florin Coras | b384b54 | 2018-01-15 01:08:33 -0800 | [diff] [blame] | 2697 | stream_session_accept_notify (&tc0->connection); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2698 | error0 = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2699 | break; |
| 2700 | case TCP_STATE_ESTABLISHED: |
| 2701 | /* We can get packets in established state here because they |
| 2702 | * were enqueued before state change */ |
| 2703 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2704 | { |
| 2705 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2706 | goto drop; |
| 2707 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2708 | |
| 2709 | break; |
| 2710 | case TCP_STATE_FIN_WAIT_1: |
| 2711 | /* In addition to the processing for the ESTABLISHED state, if |
| 2712 | * our FIN is now acknowledged then enter FIN-WAIT-2 and |
| 2713 | * continue processing in that state. */ |
| 2714 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2715 | { |
| 2716 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2717 | goto drop; |
| 2718 | } |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2719 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2720 | /* Still have to send the FIN */ |
| 2721 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2722 | { |
| 2723 | /* TX fifo finally drained */ |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 2724 | if (!session_tx_fifo_max_dequeue (&tc0->connection)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2725 | tcp_send_fin (tc0); |
| 2726 | } |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2727 | /* If FIN is ACKed */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2728 | else if (tc0->snd_una == tc0->snd_una_max) |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2729 | { |
| 2730 | tc0->state = TCP_STATE_FIN_WAIT_2; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2731 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2732 | |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2733 | /* Stop all retransmit timers because we have nothing more |
| 2734 | * to send. Enable waitclose though because we're willing to |
| 2735 | * wait for peer's FIN but not indefinitely. */ |
| 2736 | tcp_connection_timers_reset (tc0); |
| 2737 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2738 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2739 | break; |
| 2740 | case TCP_STATE_FIN_WAIT_2: |
| 2741 | /* In addition to the processing for the ESTABLISHED state, if |
| 2742 | * the retransmission queue is empty, the user's CLOSE can be |
| 2743 | * acknowledged ("ok") but do not delete the TCB. */ |
| 2744 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2745 | { |
| 2746 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2747 | goto drop; |
| 2748 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2749 | break; |
| 2750 | case TCP_STATE_CLOSE_WAIT: |
| 2751 | /* Do the same processing as for the ESTABLISHED state. */ |
| 2752 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2753 | { |
| 2754 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2755 | goto drop; |
| 2756 | } |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 2757 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2758 | { |
| 2759 | /* TX fifo finally drained */ |
| 2760 | if (!session_tx_fifo_max_dequeue (&tc0->connection)) |
| 2761 | { |
| 2762 | tcp_send_fin (tc0); |
| 2763 | tcp_connection_timers_reset (tc0); |
| 2764 | tc0->state = TCP_STATE_LAST_ACK; |
| 2765 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, |
| 2766 | TCP_2MSL_TIME); |
| 2767 | } |
| 2768 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2769 | break; |
| 2770 | case TCP_STATE_CLOSING: |
| 2771 | /* In addition to the processing for the ESTABLISHED state, if |
| 2772 | * the ACK acknowledges our FIN then enter the TIME-WAIT state, |
| 2773 | * otherwise ignore the segment. */ |
| 2774 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2775 | { |
| 2776 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2777 | goto drop; |
| 2778 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2779 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2780 | tc0->state = TCP_STATE_TIME_WAIT; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2781 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2782 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2783 | goto drop; |
| 2784 | |
| 2785 | break; |
| 2786 | case TCP_STATE_LAST_ACK: |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2787 | /* The only thing that [should] arrive in this state is an |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2788 | * acknowledgment of our FIN. If our FIN is now acknowledged, |
| 2789 | * delete the TCB, enter the CLOSED state, and return. */ |
| 2790 | |
| 2791 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2792 | { |
| 2793 | error0 = TCP_ERROR_ACK_INVALID; |
| 2794 | goto drop; |
| 2795 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2796 | error0 = TCP_ERROR_ACK_OK; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2797 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2798 | /* Apparently our ACK for the peer's FIN was lost */ |
| 2799 | if (is_fin0 && tc0->snd_una != tc0->snd_una_max) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2800 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2801 | tcp_send_fin (tc0); |
| 2802 | goto drop; |
| 2803 | } |
| 2804 | |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2805 | tc0->state = TCP_STATE_CLOSED; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2806 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | c01d578 | 2018-10-17 14:53:11 -0700 | [diff] [blame] | 2807 | |
| 2808 | /* Don't free the connection from the data path since |
| 2809 | * we can't ensure that we have no packets already enqueued |
| 2810 | * to output. Rely instead on the waitclose timer */ |
| 2811 | tcp_connection_timers_reset (tc0); |
| 2812 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, 1); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2813 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2814 | goto drop; |
| 2815 | |
| 2816 | break; |
| 2817 | case TCP_STATE_TIME_WAIT: |
| 2818 | /* The only thing that can arrive in this state is a |
| 2819 | * retransmission of the remote FIN. Acknowledge it, and restart |
| 2820 | * the 2 MSL timeout. */ |
| 2821 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2822 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2823 | { |
| 2824 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2825 | goto drop; |
| 2826 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2827 | |
| 2828 | tcp_make_ack (tc0, b0); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2829 | next0 = tcp_next_output (is_ip4); |
| 2830 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2831 | goto drop; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2832 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2833 | break; |
| 2834 | default: |
| 2835 | ASSERT (0); |
| 2836 | } |
| 2837 | |
| 2838 | /* 6: check the URG bit TODO */ |
| 2839 | |
| 2840 | /* 7: process the segment text */ |
| 2841 | switch (tc0->state) |
| 2842 | { |
| 2843 | case TCP_STATE_ESTABLISHED: |
| 2844 | case TCP_STATE_FIN_WAIT_1: |
| 2845 | case TCP_STATE_FIN_WAIT_2: |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2846 | if (vnet_buffer (b0)->tcp.data_len) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2847 | { |
| 2848 | error0 = tcp_segment_rcv (tc0, b0, &next0); |
| 2849 | tcp_maybe_inc_counter (rcv_process, error0, 1); |
| 2850 | } |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2851 | else if (is_fin0) |
| 2852 | tc0->rcv_nxt += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2853 | break; |
| 2854 | case TCP_STATE_CLOSE_WAIT: |
| 2855 | case TCP_STATE_CLOSING: |
| 2856 | case TCP_STATE_LAST_ACK: |
| 2857 | case TCP_STATE_TIME_WAIT: |
| 2858 | /* This should not occur, since a FIN has been received from the |
| 2859 | * remote side. Ignore the segment text. */ |
| 2860 | break; |
| 2861 | } |
| 2862 | |
| 2863 | /* 8: check the FIN bit */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2864 | if (!is_fin0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2865 | goto drop; |
| 2866 | |
| 2867 | switch (tc0->state) |
| 2868 | { |
| 2869 | case TCP_STATE_ESTABLISHED: |
| 2870 | case TCP_STATE_SYN_RCVD: |
| 2871 | /* Send FIN-ACK notify app and enter CLOSE-WAIT */ |
| 2872 | tcp_connection_timers_reset (tc0); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2873 | tcp_make_fin (tc0, b0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2874 | tc0->snd_nxt += 1; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2875 | tc0->snd_una_max = tc0->snd_nxt; |
Florin Coras | c01c445 | 2018-09-20 18:36:54 -0700 | [diff] [blame] | 2876 | tcp_retransmit_timer_set (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2877 | next0 = tcp_next_output (tc0->c_is_ip4); |
| 2878 | stream_session_disconnect_notify (&tc0->connection); |
| 2879 | tc0->state = TCP_STATE_CLOSE_WAIT; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2880 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2881 | break; |
| 2882 | case TCP_STATE_CLOSE_WAIT: |
| 2883 | case TCP_STATE_CLOSING: |
| 2884 | case TCP_STATE_LAST_ACK: |
| 2885 | /* move along .. */ |
| 2886 | break; |
| 2887 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2888 | tc0->state = TCP_STATE_CLOSING; |
| 2889 | tcp_make_ack (tc0, b0); |
| 2890 | next0 = tcp_next_output (is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2891 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2892 | /* Wait for ACK but not forever */ |
| 2893 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2894 | break; |
| 2895 | case TCP_STATE_FIN_WAIT_2: |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2896 | /* Got FIN, send ACK! Be more aggressive with resource cleanup */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2897 | tc0->state = TCP_STATE_TIME_WAIT; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 2898 | tcp_connection_timers_reset (tc0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2899 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2900 | tcp_make_ack (tc0, b0); |
| 2901 | next0 = tcp_next_output (is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2902 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2903 | break; |
| 2904 | case TCP_STATE_TIME_WAIT: |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2905 | /* Remain in the TIME-WAIT state. Restart the time-wait |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2906 | * timeout. |
| 2907 | */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2908 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2909 | break; |
| 2910 | } |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2911 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2912 | n_fins += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2913 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2914 | drop: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2915 | b0->error = error0 ? node->errors[error0] : 0; |
| 2916 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2917 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2918 | { |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2919 | tcp_rx_trace_t *t0 = |
| 2920 | vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2921 | tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2922 | } |
| 2923 | |
| 2924 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2925 | n_left_to_next, bi0, next0); |
| 2926 | } |
| 2927 | |
| 2928 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2929 | } |
| 2930 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2931 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 2932 | my_thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2933 | tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors); |
| 2934 | tcp_inc_counter (rcv_process, TCP_ERROR_FIN_RCVD, n_fins); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2935 | return from_frame->n_vectors; |
| 2936 | } |
| 2937 | |
| 2938 | static uword |
| 2939 | tcp4_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2940 | vlib_frame_t * from_frame) |
| 2941 | { |
| 2942 | return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2943 | } |
| 2944 | |
| 2945 | static uword |
| 2946 | tcp6_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2947 | vlib_frame_t * from_frame) |
| 2948 | { |
| 2949 | return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2950 | } |
| 2951 | |
| 2952 | /* *INDENT-OFF* */ |
| 2953 | VLIB_REGISTER_NODE (tcp4_rcv_process_node) = |
| 2954 | { |
| 2955 | .function = tcp4_rcv_process, |
| 2956 | .name = "tcp4-rcv-process", |
| 2957 | /* Takes a vector of packets. */ |
| 2958 | .vector_size = sizeof (u32), |
| 2959 | .n_errors = TCP_N_ERROR, |
| 2960 | .error_strings = tcp_error_strings, |
| 2961 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2962 | .next_nodes = |
| 2963 | { |
| 2964 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2965 | foreach_tcp_state_next |
| 2966 | #undef _ |
| 2967 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2968 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2969 | }; |
| 2970 | /* *INDENT-ON* */ |
| 2971 | |
| 2972 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_rcv_process_node, tcp4_rcv_process); |
| 2973 | |
| 2974 | /* *INDENT-OFF* */ |
| 2975 | VLIB_REGISTER_NODE (tcp6_rcv_process_node) = |
| 2976 | { |
| 2977 | .function = tcp6_rcv_process, |
| 2978 | .name = "tcp6-rcv-process", |
| 2979 | /* Takes a vector of packets. */ |
| 2980 | .vector_size = sizeof (u32), |
| 2981 | .n_errors = TCP_N_ERROR, |
| 2982 | .error_strings = tcp_error_strings, |
| 2983 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2984 | .next_nodes = |
| 2985 | { |
| 2986 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2987 | foreach_tcp_state_next |
| 2988 | #undef _ |
| 2989 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2990 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2991 | }; |
| 2992 | /* *INDENT-ON* */ |
| 2993 | |
| 2994 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_rcv_process_node, tcp6_rcv_process); |
| 2995 | |
| 2996 | vlib_node_registration_t tcp4_listen_node; |
| 2997 | vlib_node_registration_t tcp6_listen_node; |
| 2998 | |
| 2999 | /** |
| 3000 | * LISTEN state processing as per RFC 793 p. 65 |
| 3001 | */ |
| 3002 | always_inline uword |
| 3003 | tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3004 | vlib_frame_t * from_frame, int is_ip4) |
| 3005 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3006 | u32 n_left_from, next_index, *from, *to_next, n_syns = 0; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 3007 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3008 | |
| 3009 | from = vlib_frame_vector_args (from_frame); |
| 3010 | n_left_from = from_frame->n_vectors; |
| 3011 | |
| 3012 | next_index = node->cached_next_index; |
| 3013 | |
| 3014 | while (n_left_from > 0) |
| 3015 | { |
| 3016 | u32 n_left_to_next; |
| 3017 | |
| 3018 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 3019 | |
| 3020 | while (n_left_from > 0 && n_left_to_next > 0) |
| 3021 | { |
| 3022 | u32 bi0; |
| 3023 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3024 | tcp_rx_trace_t *t0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3025 | tcp_header_t *th0 = 0; |
| 3026 | tcp_connection_t *lc0; |
| 3027 | ip4_header_t *ip40; |
| 3028 | ip6_header_t *ip60; |
| 3029 | tcp_connection_t *child0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3030 | u32 error0 = TCP_ERROR_NONE, next0 = tcp_next_drop (is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3031 | |
| 3032 | bi0 = from[0]; |
| 3033 | to_next[0] = bi0; |
| 3034 | from += 1; |
| 3035 | to_next += 1; |
| 3036 | n_left_from -= 1; |
| 3037 | n_left_to_next -= 1; |
| 3038 | |
| 3039 | b0 = vlib_get_buffer (vm, bi0); |
| 3040 | lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); |
| 3041 | |
| 3042 | if (is_ip4) |
| 3043 | { |
| 3044 | ip40 = vlib_buffer_get_current (b0); |
| 3045 | th0 = ip4_next_header (ip40); |
| 3046 | } |
| 3047 | else |
| 3048 | { |
| 3049 | ip60 = vlib_buffer_get_current (b0); |
| 3050 | th0 = ip6_next_header (ip60); |
| 3051 | } |
| 3052 | |
| 3053 | /* Create child session. For syn-flood protection use filter */ |
| 3054 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3055 | /* 1. first check for an RST: handled in dispatch */ |
| 3056 | /* if (tcp_rst (th0)) |
| 3057 | goto drop; */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3058 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3059 | /* 2. second check for an ACK: handled in dispatch */ |
| 3060 | /* if (tcp_ack (th0)) |
| 3061 | { |
| 3062 | tcp_send_reset (b0, is_ip4); |
| 3063 | goto drop; |
| 3064 | } */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3065 | |
| 3066 | /* 3. check for a SYN (did that already) */ |
| 3067 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 3068 | /* Make sure connection wasn't just created */ |
Florin Coras | c1a448b | 2018-04-20 10:51:49 -0700 | [diff] [blame] | 3069 | child0 = tcp_lookup_connection (lc0->c_fib_index, b0, |
| 3070 | my_thread_index, is_ip4); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 3071 | if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN)) |
| 3072 | { |
| 3073 | error0 = TCP_ERROR_CREATE_EXISTS; |
| 3074 | goto drop; |
| 3075 | } |
| 3076 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3077 | /* Create child session and send SYN-ACK */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 3078 | child0 = tcp_connection_new (my_thread_index); |
Florin Coras | 1c71045 | 2017-10-17 00:03:13 -0700 | [diff] [blame] | 3079 | child0->c_lcl_port = th0->dst_port; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3080 | child0->c_rmt_port = th0->src_port; |
| 3081 | child0->c_is_ip4 = is_ip4; |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 3082 | child0->state = TCP_STATE_SYN_RCVD; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 3083 | child0->c_fib_index = lc0->c_fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3084 | |
| 3085 | if (is_ip4) |
| 3086 | { |
| 3087 | child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32; |
| 3088 | child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32; |
| 3089 | } |
| 3090 | else |
| 3091 | { |
| 3092 | clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address, |
| 3093 | sizeof (ip6_address_t)); |
| 3094 | clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address, |
| 3095 | sizeof (ip6_address_t)); |
| 3096 | } |
| 3097 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3098 | if (tcp_options_parse (th0, &child0->rcv_opts)) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3099 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 3100 | clib_warning ("options parse fail"); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3101 | goto drop; |
| 3102 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3103 | |
| 3104 | child0->irs = vnet_buffer (b0)->tcp.seq_number; |
| 3105 | child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 3106 | child0->rcv_las = child0->rcv_nxt; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 3107 | child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3108 | |
| 3109 | /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} |
| 3110 | * segments are used to initialize PAWS. */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3111 | if (tcp_opts_tstamp (&child0->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3112 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3113 | child0->tsval_recent = child0->rcv_opts.tsval; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3114 | child0->tsval_recent_age = tcp_time_now (); |
| 3115 | } |
| 3116 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3117 | if (tcp_opts_wscale (&child0->rcv_opts)) |
| 3118 | child0->snd_wscale = child0->rcv_opts.wscale; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 3119 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3120 | child0->snd_wnd = clib_net_to_host_u16 (th0->window) |
| 3121 | << child0->snd_wscale; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 3122 | child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 3123 | child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
| 3124 | |
| 3125 | tcp_connection_init_vars (child0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 3126 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1); |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 3127 | |
Florin Coras | 6dfb5ac | 2017-11-09 16:26:03 -0800 | [diff] [blame] | 3128 | if (stream_session_accept (&child0->connection, lc0->c_s_index, |
| 3129 | 0 /* notify */ )) |
| 3130 | { |
| 3131 | clib_warning ("session accept fail"); |
| 3132 | tcp_connection_cleanup (child0); |
| 3133 | error0 = TCP_ERROR_CREATE_SESSION_FAIL; |
| 3134 | goto drop; |
| 3135 | } |
| 3136 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3137 | /* Reuse buffer to make syn-ack and send */ |
| 3138 | tcp_make_synack (child0, b0); |
| 3139 | next0 = tcp_next_output (is_ip4); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 3140 | tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3141 | |
| 3142 | drop: |
| 3143 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 3144 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3145 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 3146 | clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
| 3147 | clib_memcpy (&t0->tcp_connection, lc0, |
| 3148 | sizeof (t0->tcp_connection)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3149 | } |
| 3150 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3151 | n_syns += (error0 == TCP_ERROR_NONE); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 3152 | b0->error = node->errors[error0]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3153 | |
| 3154 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 3155 | n_left_to_next, bi0, next0); |
| 3156 | } |
| 3157 | |
| 3158 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 3159 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3160 | |
| 3161 | tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3162 | return from_frame->n_vectors; |
| 3163 | } |
| 3164 | |
| 3165 | static uword |
| 3166 | tcp4_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3167 | vlib_frame_t * from_frame) |
| 3168 | { |
| 3169 | return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 3170 | } |
| 3171 | |
| 3172 | static uword |
| 3173 | tcp6_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3174 | vlib_frame_t * from_frame) |
| 3175 | { |
| 3176 | return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 3177 | } |
| 3178 | |
| 3179 | /* *INDENT-OFF* */ |
| 3180 | VLIB_REGISTER_NODE (tcp4_listen_node) = |
| 3181 | { |
| 3182 | .function = tcp4_listen, |
| 3183 | .name = "tcp4-listen", |
| 3184 | /* Takes a vector of packets. */ |
| 3185 | .vector_size = sizeof (u32), |
| 3186 | .n_errors = TCP_N_ERROR, |
| 3187 | .error_strings = tcp_error_strings, |
| 3188 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 3189 | .next_nodes = |
| 3190 | { |
| 3191 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 3192 | foreach_tcp_state_next |
| 3193 | #undef _ |
| 3194 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3195 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3196 | }; |
| 3197 | /* *INDENT-ON* */ |
| 3198 | |
| 3199 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_listen_node, tcp4_listen); |
| 3200 | |
| 3201 | /* *INDENT-OFF* */ |
| 3202 | VLIB_REGISTER_NODE (tcp6_listen_node) = |
| 3203 | { |
| 3204 | .function = tcp6_listen, |
| 3205 | .name = "tcp6-listen", |
| 3206 | /* Takes a vector of packets. */ |
| 3207 | .vector_size = sizeof (u32), |
| 3208 | .n_errors = TCP_N_ERROR, |
| 3209 | .error_strings = tcp_error_strings, |
| 3210 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 3211 | .next_nodes = |
| 3212 | { |
| 3213 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 3214 | foreach_tcp_state_next |
| 3215 | #undef _ |
| 3216 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3217 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3218 | }; |
| 3219 | /* *INDENT-ON* */ |
| 3220 | |
| 3221 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_listen_node, tcp6_listen); |
| 3222 | |
| 3223 | vlib_node_registration_t tcp4_input_node; |
| 3224 | vlib_node_registration_t tcp6_input_node; |
| 3225 | |
| 3226 | typedef enum _tcp_input_next |
| 3227 | { |
| 3228 | TCP_INPUT_NEXT_DROP, |
| 3229 | TCP_INPUT_NEXT_LISTEN, |
| 3230 | TCP_INPUT_NEXT_RCV_PROCESS, |
| 3231 | TCP_INPUT_NEXT_SYN_SENT, |
| 3232 | TCP_INPUT_NEXT_ESTABLISHED, |
| 3233 | TCP_INPUT_NEXT_RESET, |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3234 | TCP_INPUT_NEXT_PUNT, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3235 | TCP_INPUT_N_NEXT |
| 3236 | } tcp_input_next_t; |
| 3237 | |
| 3238 | #define foreach_tcp4_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3239 | _ (DROP, "ip4-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3240 | _ (LISTEN, "tcp4-listen") \ |
| 3241 | _ (RCV_PROCESS, "tcp4-rcv-process") \ |
| 3242 | _ (SYN_SENT, "tcp4-syn-sent") \ |
| 3243 | _ (ESTABLISHED, "tcp4-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3244 | _ (RESET, "tcp4-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3245 | _ (PUNT, "ip4-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3246 | |
| 3247 | #define foreach_tcp6_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3248 | _ (DROP, "ip6-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3249 | _ (LISTEN, "tcp6-listen") \ |
| 3250 | _ (RCV_PROCESS, "tcp6-rcv-process") \ |
| 3251 | _ (SYN_SENT, "tcp6-syn-sent") \ |
| 3252 | _ (ESTABLISHED, "tcp6-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3253 | _ (RESET, "tcp6-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3254 | _ (PUNT, "ip6-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3255 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3256 | #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) |
| 3257 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3258 | static void |
| 3259 | 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] | 3260 | vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3261 | { |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3262 | tcp_connection_t *tc; |
| 3263 | tcp_header_t *tcp; |
| 3264 | tcp_rx_trace_t *t; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3265 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3266 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 3267 | for (i = 0; i < n_bufs; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3268 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 3269 | if (bs[i]->flags & VLIB_BUFFER_IS_TRACED) |
| 3270 | { |
| 3271 | t = vlib_add_trace (vm, node, bs[i], sizeof (*t)); |
| 3272 | tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index, |
| 3273 | vm->thread_index); |
| 3274 | tcp = vlib_buffer_get_current (bs[i]); |
| 3275 | tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4); |
| 3276 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3277 | } |
| 3278 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3279 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3280 | static void |
| 3281 | tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) |
| 3282 | { |
| 3283 | if (*error == TCP_ERROR_FILTERED) |
| 3284 | { |
| 3285 | *next = TCP_INPUT_NEXT_DROP; |
| 3286 | } |
| 3287 | else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6)) |
| 3288 | { |
| 3289 | *next = TCP_INPUT_NEXT_PUNT; |
| 3290 | *error = TCP_ERROR_PUNT; |
| 3291 | } |
| 3292 | else |
| 3293 | { |
| 3294 | *next = TCP_INPUT_NEXT_RESET; |
| 3295 | *error = TCP_ERROR_NO_LISTENER; |
| 3296 | } |
| 3297 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3298 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3299 | static inline tcp_connection_t * |
| 3300 | tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, |
| 3301 | u8 is_ip4) |
| 3302 | { |
| 3303 | u32 fib_index = vnet_buffer (b)->ip.fib_index; |
| 3304 | int n_advance_bytes, n_data_bytes; |
| 3305 | transport_connection_t *tc; |
| 3306 | tcp_header_t *tcp; |
| 3307 | u8 is_filtered = 0; |
| 3308 | |
| 3309 | if (is_ip4) |
| 3310 | { |
| 3311 | ip4_header_t *ip4 = vlib_buffer_get_current (b); |
| 3312 | tcp = ip4_next_header (ip4); |
| 3313 | vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4; |
| 3314 | n_advance_bytes = (ip4_header_bytes (ip4) + tcp_header_bytes (tcp)); |
| 3315 | n_data_bytes = clib_net_to_host_u16 (ip4->length) - n_advance_bytes; |
| 3316 | |
| 3317 | /* Length check. Checksum computed by ipx_local no need to compute again */ |
| 3318 | if (PREDICT_FALSE (n_advance_bytes < 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3319 | { |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3320 | *error = TCP_ERROR_LENGTH; |
| 3321 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3322 | } |
| 3323 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3324 | tc = session_lookup_connection_wt4 (fib_index, &ip4->dst_address, |
| 3325 | &ip4->src_address, tcp->dst_port, |
| 3326 | tcp->src_port, TRANSPORT_PROTO_TCP, |
| 3327 | thread_index, &is_filtered); |
| 3328 | } |
| 3329 | else |
| 3330 | { |
| 3331 | ip6_header_t *ip6 = vlib_buffer_get_current (b); |
| 3332 | tcp = ip6_next_header (ip6); |
| 3333 | vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip6; |
| 3334 | n_advance_bytes = tcp_header_bytes (tcp); |
| 3335 | n_data_bytes = clib_net_to_host_u16 (ip6->payload_length) |
| 3336 | - n_advance_bytes; |
| 3337 | n_advance_bytes += sizeof (ip6[0]); |
| 3338 | |
| 3339 | if (PREDICT_FALSE (n_advance_bytes < 0)) |
| 3340 | { |
| 3341 | *error = TCP_ERROR_LENGTH; |
| 3342 | return 0; |
| 3343 | } |
| 3344 | |
| 3345 | tc = session_lookup_connection_wt6 (fib_index, &ip6->dst_address, |
| 3346 | &ip6->src_address, tcp->dst_port, |
| 3347 | tcp->src_port, TRANSPORT_PROTO_TCP, |
| 3348 | thread_index, &is_filtered); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3349 | } |
| 3350 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3351 | vnet_buffer (b)->tcp.seq_number = clib_net_to_host_u32 (tcp->seq_number); |
| 3352 | vnet_buffer (b)->tcp.ack_number = clib_net_to_host_u32 (tcp->ack_number); |
| 3353 | vnet_buffer (b)->tcp.data_offset = n_advance_bytes; |
| 3354 | vnet_buffer (b)->tcp.data_len = n_data_bytes; |
| 3355 | vnet_buffer (b)->tcp.flags = 0; |
| 3356 | |
| 3357 | *error = is_filtered ? TCP_ERROR_FILTERED : *error; |
| 3358 | |
| 3359 | return tcp_get_connection_from_transport (tc); |
| 3360 | } |
| 3361 | |
| 3362 | static inline void |
| 3363 | tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc, |
| 3364 | vlib_buffer_t * b, u16 * next, u32 * error) |
| 3365 | { |
| 3366 | tcp_header_t *tcp; |
| 3367 | u8 flags; |
| 3368 | |
| 3369 | tcp = tcp_buffer_hdr (b); |
| 3370 | flags = tcp->flags & filter_flags; |
| 3371 | *next = tm->dispatch_table[tc->state][flags].next; |
| 3372 | *error = tm->dispatch_table[tc->state][flags].error; |
| 3373 | |
| 3374 | if (PREDICT_FALSE (*error == TCP_ERROR_DISPATCH |
| 3375 | || *next == TCP_INPUT_NEXT_RESET)) |
| 3376 | { |
| 3377 | /* Overload tcp flags to store state */ |
| 3378 | tcp_state_t state = tc->state; |
| 3379 | vnet_buffer (b)->tcp.flags = tc->state; |
| 3380 | |
| 3381 | if (*error == TCP_ERROR_DISPATCH) |
| 3382 | clib_warning ("disp error state %U flags %U", format_tcp_state, |
| 3383 | state, format_tcp_flags, (int) flags); |
| 3384 | } |
| 3385 | } |
| 3386 | |
| 3387 | always_inline uword |
| 3388 | tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3389 | vlib_frame_t * frame, int is_ip4) |
| 3390 | { |
| 3391 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 3392 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3393 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 3394 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 3395 | |
| 3396 | tcp_set_time_now (thread_index); |
| 3397 | |
| 3398 | from = vlib_frame_vector_args (frame); |
| 3399 | n_left_from = frame->n_vectors; |
| 3400 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 3401 | |
| 3402 | b = bufs; |
| 3403 | next = nexts; |
| 3404 | |
| 3405 | while (n_left_from >= 4) |
| 3406 | { |
| 3407 | u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER; |
| 3408 | tcp_connection_t *tc0, *tc1; |
| 3409 | |
| 3410 | { |
| 3411 | vlib_prefetch_buffer_header (b[2], STORE); |
| 3412 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3413 | |
| 3414 | vlib_prefetch_buffer_header (b[3], STORE); |
| 3415 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3416 | } |
| 3417 | |
| 3418 | next[0] = next[1] = TCP_INPUT_NEXT_DROP; |
| 3419 | |
| 3420 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); |
| 3421 | tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4); |
| 3422 | |
| 3423 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 3424 | { |
| 3425 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3426 | ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); |
| 3427 | |
| 3428 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3429 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 3430 | |
| 3431 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3432 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); |
| 3433 | } |
| 3434 | else |
| 3435 | { |
| 3436 | if (PREDICT_TRUE (tc0 != 0)) |
| 3437 | { |
| 3438 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3439 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3440 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3441 | } |
| 3442 | else |
| 3443 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
| 3444 | |
| 3445 | if (PREDICT_TRUE (tc1 != 0)) |
| 3446 | { |
| 3447 | ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); |
| 3448 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 3449 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); |
| 3450 | } |
| 3451 | else |
| 3452 | tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); |
| 3453 | } |
| 3454 | |
| 3455 | b += 2; |
| 3456 | next += 2; |
| 3457 | n_left_from -= 2; |
| 3458 | } |
| 3459 | while (n_left_from > 0) |
| 3460 | { |
| 3461 | tcp_connection_t *tc0; |
| 3462 | u32 error0 = TCP_ERROR_NO_LISTENER; |
| 3463 | |
| 3464 | if (n_left_from > 1) |
| 3465 | { |
| 3466 | vlib_prefetch_buffer_header (b[1], STORE); |
| 3467 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3468 | } |
| 3469 | |
| 3470 | next[0] = TCP_INPUT_NEXT_DROP; |
| 3471 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); |
| 3472 | if (PREDICT_TRUE (tc0 != 0)) |
| 3473 | { |
| 3474 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3475 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3476 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3477 | } |
| 3478 | else |
| 3479 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
| 3480 | |
| 3481 | b += 1; |
| 3482 | next += 1; |
| 3483 | n_left_from -= 1; |
| 3484 | } |
| 3485 | |
| 3486 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 3487 | tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4); |
| 3488 | |
| 3489 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 3490 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3491 | } |
| 3492 | |
| 3493 | static uword |
| 3494 | tcp4_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3495 | vlib_frame_t * from_frame) |
| 3496 | { |
| 3497 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 3498 | } |
| 3499 | |
| 3500 | static uword |
| 3501 | tcp6_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3502 | vlib_frame_t * from_frame) |
| 3503 | { |
| 3504 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 3505 | } |
| 3506 | |
| 3507 | /* *INDENT-OFF* */ |
| 3508 | VLIB_REGISTER_NODE (tcp4_input_node) = |
| 3509 | { |
| 3510 | .function = tcp4_input, |
| 3511 | .name = "tcp4-input", |
| 3512 | /* Takes a vector of packets. */ |
| 3513 | .vector_size = sizeof (u32), |
| 3514 | .n_errors = TCP_N_ERROR, |
| 3515 | .error_strings = tcp_error_strings, |
| 3516 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3517 | .next_nodes = |
| 3518 | { |
| 3519 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3520 | foreach_tcp4_input_next |
| 3521 | #undef _ |
| 3522 | }, |
| 3523 | .format_buffer = format_tcp_header, |
| 3524 | .format_trace = format_tcp_rx_trace, |
| 3525 | }; |
| 3526 | /* *INDENT-ON* */ |
| 3527 | |
| 3528 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_input_node, tcp4_input); |
| 3529 | |
| 3530 | /* *INDENT-OFF* */ |
| 3531 | VLIB_REGISTER_NODE (tcp6_input_node) = |
| 3532 | { |
| 3533 | .function = tcp6_input, |
| 3534 | .name = "tcp6-input", |
| 3535 | /* Takes a vector of packets. */ |
| 3536 | .vector_size = sizeof (u32), |
| 3537 | .n_errors = TCP_N_ERROR, |
| 3538 | .error_strings = tcp_error_strings, |
| 3539 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3540 | .next_nodes = |
| 3541 | { |
| 3542 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3543 | foreach_tcp6_input_next |
| 3544 | #undef _ |
| 3545 | }, |
| 3546 | .format_buffer = format_tcp_header, |
| 3547 | .format_trace = format_tcp_rx_trace, |
| 3548 | }; |
| 3549 | /* *INDENT-ON* */ |
| 3550 | |
| 3551 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3552 | |
| 3553 | static void |
| 3554 | tcp_dispatch_table_init (tcp_main_t * tm) |
| 3555 | { |
| 3556 | int i, j; |
| 3557 | for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++) |
| 3558 | for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++) |
| 3559 | { |
| 3560 | tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP; |
| 3561 | tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH; |
| 3562 | } |
| 3563 | |
| 3564 | #define _(t,f,n,e) \ |
| 3565 | do { \ |
| 3566 | tm->dispatch_table[TCP_STATE_##t][f].next = (n); \ |
| 3567 | tm->dispatch_table[TCP_STATE_##t][f].error = (e); \ |
| 3568 | } while (0) |
| 3569 | |
| 3570 | /* SYNs for new connections -> tcp-listen. */ |
| 3571 | _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3572 | _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3573 | _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_RST_RCVD); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3574 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
| 3575 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3576 | /* ACK for for a SYN-ACK -> tcp-rcv-process. */ |
| 3577 | _(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] | 3578 | _(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] | 3579 | _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3580 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3581 | _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | c01c445 | 2018-09-20 18:36:54 -0700 | [diff] [blame] | 3582 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3583 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3584 | /* SYN-ACK for a SYN */ |
| 3585 | _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3586 | TCP_ERROR_NONE); |
| 3587 | _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3588 | _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3589 | _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3590 | TCP_ERROR_NONE); |
| 3591 | /* ACK for for established connection -> tcp-established. */ |
| 3592 | _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3593 | /* FIN for for established connection -> tcp-established. */ |
| 3594 | _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3595 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3596 | TCP_ERROR_NONE); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 3597 | _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3598 | _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3599 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3600 | _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3601 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3602 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3603 | /* ACK or FIN-ACK to our FIN */ |
| 3604 | _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3605 | _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3606 | TCP_ERROR_NONE); |
| 3607 | /* FIN in reply to our FIN from the other side */ |
| 3608 | _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3609 | _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 5631893 | 2018-05-23 20:44:12 -0700 | [diff] [blame] | 3610 | _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3611 | /* FIN confirming that the peer (app) has closed */ |
| 3612 | _(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] | 3613 | _(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] | 3614 | _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3615 | TCP_ERROR_NONE); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3616 | _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3617 | _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3618 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3619 | _(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] | 3620 | _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3621 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3622 | TCP_ERROR_NONE); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3623 | _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | c01d578 | 2018-10-17 14:53:11 -0700 | [diff] [blame] | 3624 | _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3625 | _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3626 | _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3627 | TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3628 | _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 3629 | _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 3630 | _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3631 | _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 3632 | _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3633 | TCP_ERROR_CONNECTION_CLOSED); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3634 | #undef _ |
| 3635 | } |
| 3636 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 3637 | static clib_error_t * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3638 | tcp_input_init (vlib_main_t * vm) |
| 3639 | { |
| 3640 | clib_error_t *error = 0; |
| 3641 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3642 | |
| 3643 | if ((error = vlib_call_init_function (vm, tcp_init))) |
| 3644 | return error; |
| 3645 | |
| 3646 | /* Initialize dispatch table. */ |
| 3647 | tcp_dispatch_table_init (tm); |
| 3648 | |
| 3649 | return error; |
| 3650 | } |
| 3651 | |
| 3652 | VLIB_INIT_FUNCTION (tcp_input_init); |
| 3653 | |
| 3654 | /* |
| 3655 | * fd.io coding-style-patch-verification: ON |
| 3656 | * |
| 3657 | * Local Variables: |
| 3658 | * eval: (c-set-style "gnu") |
| 3659 | * End: |
| 3660 | */ |