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 |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 124 | * @param is_syn set if packet is syn |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 125 | * @return -1 if parsing failed |
| 126 | */ |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 127 | static inline int |
| 128 | tcp_options_parse (tcp_header_t * th, tcp_options_t * to, u8 is_syn) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 129 | { |
| 130 | const u8 *data; |
| 131 | u8 opt_len, opts_len, kind; |
| 132 | int j; |
| 133 | sack_block_t b; |
| 134 | |
| 135 | opts_len = (tcp_doff (th) << 2) - sizeof (tcp_header_t); |
| 136 | data = (const u8 *) (th + 1); |
| 137 | |
| 138 | /* Zero out all flags but those set in SYN */ |
Florin Coras | d6fe5bd | 2018-10-16 19:52:10 -0700 | [diff] [blame] | 139 | to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 140 | | TCP_OPTS_FLAG_TSTAMP | TCP_OPTION_MSS); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 141 | |
| 142 | for (; opts_len > 0; opts_len -= opt_len, data += opt_len) |
| 143 | { |
| 144 | kind = data[0]; |
| 145 | |
| 146 | /* Get options length */ |
| 147 | if (kind == TCP_OPTION_EOL) |
| 148 | break; |
| 149 | else if (kind == TCP_OPTION_NOOP) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 150 | { |
| 151 | opt_len = 1; |
| 152 | continue; |
| 153 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 154 | else |
| 155 | { |
| 156 | /* broken options */ |
| 157 | if (opts_len < 2) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 158 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 159 | opt_len = data[1]; |
| 160 | |
| 161 | /* weird option length */ |
| 162 | if (opt_len < 2 || opt_len > opts_len) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 163 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /* Parse options */ |
| 167 | switch (kind) |
| 168 | { |
| 169 | case TCP_OPTION_MSS: |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 170 | if (!is_syn) |
| 171 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 172 | if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th)) |
| 173 | { |
| 174 | to->flags |= TCP_OPTS_FLAG_MSS; |
| 175 | to->mss = clib_net_to_host_u16 (*(u16 *) (data + 2)); |
| 176 | } |
| 177 | break; |
| 178 | case TCP_OPTION_WINDOW_SCALE: |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 179 | if (!is_syn) |
| 180 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 181 | if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th)) |
| 182 | { |
| 183 | to->flags |= TCP_OPTS_FLAG_WSCALE; |
| 184 | to->wscale = data[2]; |
| 185 | if (to->wscale > TCP_MAX_WND_SCALE) |
| 186 | { |
| 187 | clib_warning ("Illegal window scaling value: %d", |
| 188 | to->wscale); |
| 189 | to->wscale = TCP_MAX_WND_SCALE; |
| 190 | } |
| 191 | } |
| 192 | break; |
| 193 | case TCP_OPTION_TIMESTAMP: |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 194 | if (is_syn) |
| 195 | to->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 196 | if ((to->flags & TCP_OPTS_FLAG_TSTAMP) |
| 197 | && opt_len == TCP_OPTION_LEN_TIMESTAMP) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 198 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 199 | to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2)); |
| 200 | to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6)); |
| 201 | } |
| 202 | break; |
| 203 | case TCP_OPTION_SACK_PERMITTED: |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 204 | if (!is_syn) |
| 205 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 206 | if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th)) |
| 207 | to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 208 | break; |
| 209 | case TCP_OPTION_SACK_BLOCK: |
| 210 | /* If SACK permitted was not advertised or a SYN, break */ |
| 211 | if ((to->flags & TCP_OPTS_FLAG_SACK_PERMITTED) == 0 || tcp_syn (th)) |
| 212 | break; |
| 213 | |
| 214 | /* If too short or not correctly formatted, break */ |
| 215 | if (opt_len < 10 || ((opt_len - 2) % TCP_OPTION_LEN_SACK_BLOCK)) |
| 216 | break; |
| 217 | |
| 218 | to->flags |= TCP_OPTS_FLAG_SACK; |
| 219 | to->n_sack_blocks = (opt_len - 2) / TCP_OPTION_LEN_SACK_BLOCK; |
| 220 | vec_reset_length (to->sacks); |
| 221 | for (j = 0; j < to->n_sack_blocks; j++) |
| 222 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 223 | b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j)); |
| 224 | b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 225 | vec_add1 (to->sacks, b); |
| 226 | } |
| 227 | break; |
| 228 | default: |
| 229 | /* Nothing to see here */ |
| 230 | continue; |
| 231 | } |
| 232 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 233 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 234 | } |
| 235 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 236 | /** |
| 237 | * RFC1323: Check against wrapped sequence numbers (PAWS). If we have |
| 238 | * timestamp to echo and it's less than tsval_recent, drop segment |
| 239 | * but still send an ACK in order to retain TCP's mechanism for detecting |
| 240 | * and recovering from half-open connections |
| 241 | * |
| 242 | * Or at least that's what the theory says. It seems that this might not work |
| 243 | * very well with packet reordering and fast retransmit. XXX |
| 244 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 245 | always_inline int |
| 246 | tcp_segment_check_paws (tcp_connection_t * tc) |
| 247 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 248 | return tcp_opts_tstamp (&tc->rcv_opts) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 249 | && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 253 | * Update tsval recent |
| 254 | */ |
| 255 | always_inline void |
| 256 | tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) |
| 257 | { |
| 258 | /* |
| 259 | * RFC1323: If Last.ACK.sent falls within the range of sequence numbers |
| 260 | * of an incoming segment: |
| 261 | * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN |
| 262 | * then the TSval from the segment is copied to TS.Recent; |
| 263 | * otherwise, the TSval is ignored. |
| 264 | */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 265 | if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) |
| 266 | && seq_leq (tc->rcv_las, seq_end)) |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 267 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 268 | ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 269 | tc->tsval_recent = tc->rcv_opts.tsval; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 270 | tc->tsval_recent_age = tcp_time_now_w_thread (tc->c_thread_index); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 275 | * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 |
| 276 | * |
| 277 | * It first verifies if segment has a wrapped sequence number (PAWS) and then |
| 278 | * does the processing associated to the first four steps (ignoring security |
| 279 | * and precedence): sequence number, rst bit and syn bit checks. |
| 280 | * |
| 281 | * @return 0 if segments passes validation. |
| 282 | */ |
| 283 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 284 | tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, |
| 285 | vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 286 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 287 | /* We could get a burst of RSTs interleaved with acks */ |
| 288 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 289 | { |
| 290 | tcp_send_reset (tc0); |
| 291 | *error0 = TCP_ERROR_CONNECTION_CLOSED; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 292 | goto error; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 293 | } |
| 294 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 295 | if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 296 | { |
| 297 | *error0 = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 298 | goto error; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 299 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 300 | |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 301 | if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0))) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 302 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 303 | *error0 = TCP_ERROR_OPTIONS; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 304 | goto error; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 305 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 306 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 307 | if (PREDICT_FALSE (tcp_segment_check_paws (tc0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 308 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 309 | *error0 = TCP_ERROR_PAWS; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 310 | TCP_EVT_DBG (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, |
| 311 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 312 | |
| 313 | /* If it just so happens that a segment updates tsval_recent for a |
| 314 | * segment over 24 days old, invalidate tsval_recent. */ |
| 315 | if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 316 | tcp_time_now_w_thread (tc0->c_thread_index))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 317 | { |
Florin Coras | ea41aac | 2018-12-06 17:24:59 -0800 | [diff] [blame] | 318 | tc0->tsval_recent = tc0->rcv_opts.tsval; |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 319 | clib_warning ("paws failed: 24-day old segment"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 320 | } |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 321 | /* Drop after ack if not rst. Resets can fail paws check as per |
| 322 | * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT |
| 323 | * be subjected to the PAWS check by verifying an acceptable value in |
| 324 | * SEG.TSval */ |
| 325 | else if (!tcp_rst (th0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 326 | { |
Florin Coras | 91236ce | 2018-12-16 11:41:45 -0800 | [diff] [blame] | 327 | tcp_program_ack (wrk, tc0); |
| 328 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
| 329 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 330 | } |
| 331 | } |
| 332 | |
| 333 | /* 1st: check sequence number */ |
| 334 | if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 335 | vnet_buffer (b0)->tcp.seq_end)) |
| 336 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 337 | *error0 = TCP_ERROR_RCV_WND; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 338 | /* 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] | 339 | * through for ack processing. It should be dropped later. */ |
| 340 | if (!(tc0->rcv_wnd == 0 |
| 341 | && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 342 | { |
| 343 | /* If not RST, send dup ack */ |
| 344 | if (!tcp_rst (th0)) |
| 345 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 346 | tcp_program_dupack (wrk, tc0); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 347 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 348 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 349 | goto error; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 350 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | /* 2nd: check the RST bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 354 | if (PREDICT_FALSE (tcp_rst (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 355 | { |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 356 | tcp_connection_reset (tc0); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 357 | *error0 = TCP_ERROR_RST_RCVD; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 358 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | /* 3rd: check security and precedence (skip) */ |
| 362 | |
| 363 | /* 4th: check the SYN bit */ |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 364 | if (PREDICT_FALSE (tcp_syn (th0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 365 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 366 | /* TODO implement RFC 5961 */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 367 | if (tc0->state == TCP_STATE_SYN_RCVD) |
| 368 | { |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 369 | tcp_options_parse (th0, &tc0->rcv_opts, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 370 | tcp_send_synack (tc0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 371 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); |
| 372 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 373 | else |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 374 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 375 | tcp_program_ack (wrk, tc0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 376 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0); |
| 377 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 378 | goto error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 379 | } |
| 380 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 381 | /* If segment in window, save timestamp */ |
| 382 | tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 383 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 384 | return 0; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 385 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 386 | error: |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 387 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | always_inline int |
| 391 | tcp_rcv_ack_is_acceptable (tcp_connection_t * tc0, vlib_buffer_t * tb0) |
| 392 | { |
| 393 | /* SND.UNA =< SEG.ACK =< SND.NXT */ |
| 394 | return (seq_leq (tc0->snd_una, vnet_buffer (tb0)->tcp.ack_number) |
| 395 | && seq_leq (vnet_buffer (tb0)->tcp.ack_number, tc0->snd_nxt)); |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298 |
| 400 | * |
| 401 | * Note that although the original article, srtt and rttvar are scaled |
| 402 | * to minimize round-off errors, here we don't. Instead, we rely on |
| 403 | * better precision time measurements. |
| 404 | * |
| 405 | * TODO support us rtt resolution |
| 406 | */ |
| 407 | static void |
| 408 | tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) |
| 409 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 410 | int err, diff; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 411 | |
| 412 | if (tc->srtt != 0) |
| 413 | { |
| 414 | err = mrtt - tc->srtt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 415 | |
| 416 | /* XXX Drop in RTT results in RTTVAR increase and bigger RTO. |
| 417 | * The increase should be bound */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 418 | tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); |
| 419 | diff = (clib_abs (err) - (int) tc->rttvar) >> 2; |
| 420 | tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 421 | } |
| 422 | else |
| 423 | { |
| 424 | /* First measurement. */ |
| 425 | tc->srtt = mrtt; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 426 | tc->rttvar = mrtt >> 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 427 | } |
| 428 | } |
| 429 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 430 | void |
| 431 | tcp_update_rto (tcp_connection_t * tc) |
| 432 | { |
| 433 | tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 434 | tc->rto = clib_max (tc->rto, TCP_RTO_MIN); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 435 | } |
| 436 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 437 | /** |
| 438 | * Update RTT estimate and RTO timer |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 439 | * |
| 440 | * Measure RTT: We have two sources of RTT measurements: TSOPT and ACK |
| 441 | * timing. Middle boxes are known to fiddle with TCP options so we |
| 442 | * should give higher priority to ACK timing. |
| 443 | * |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 444 | * This should be called only if previously sent bytes have been acked. |
| 445 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 446 | * return 1 if valid rtt 0 otherwise |
| 447 | */ |
| 448 | static int |
| 449 | tcp_update_rtt (tcp_connection_t * tc, u32 ack) |
| 450 | { |
| 451 | u32 mrtt = 0; |
| 452 | |
| 453 | /* Karn's rule, part 1. Don't use retransmitted segments to estimate |
| 454 | * RTT because they're ambiguous. */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 455 | if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 456 | { |
| 457 | if (tcp_in_recovery (tc)) |
| 458 | return 0; |
| 459 | goto done; |
| 460 | } |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 461 | |
| 462 | if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 463 | { |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 464 | f64 sample = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts; |
| 465 | tc->mrtt_us = tc->mrtt_us + (sample - tc->mrtt_us) * 0.125; |
| 466 | mrtt = clib_max ((u32) (sample * THZ), 1); |
| 467 | /* Allow measuring of a new RTT */ |
| 468 | tc->rtt_ts = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 469 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 470 | /* As per RFC7323 TSecr can be used for RTTM only if the segment advances |
| 471 | * snd_una, i.e., the left side of the send window: |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 472 | * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ |
| 473 | else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 474 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 475 | u32 now = tcp_time_now_w_thread (tc->c_thread_index); |
| 476 | mrtt = clib_max (now - tc->rcv_opts.tsecr, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 477 | } |
| 478 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 479 | /* Ignore dubious measurements */ |
| 480 | if (mrtt == 0 || mrtt > TCP_RTT_MAX) |
| 481 | goto done; |
| 482 | |
| 483 | tcp_estimate_rtt (tc, mrtt); |
| 484 | |
| 485 | done: |
| 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 | |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 495 | static void |
| 496 | tcp_estimate_initial_rtt (tcp_connection_t * tc) |
| 497 | { |
| 498 | u8 thread_index = vlib_num_workers ()? 1 : 0; |
| 499 | int mrtt; |
| 500 | |
| 501 | if (tc->rtt_ts) |
| 502 | { |
| 503 | tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts; |
| 504 | mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1); |
| 505 | tc->rtt_ts = 0; |
| 506 | } |
| 507 | else |
| 508 | { |
| 509 | mrtt = tcp_time_now_w_thread (thread_index) - tc->rcv_opts.tsecr; |
Florin Coras | 4af830c | 2018-12-04 09:21:36 -0800 | [diff] [blame] | 510 | mrtt = clib_max (mrtt, 1); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 511 | tc->mrtt_us = (f64) mrtt *TCP_TICK; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | if (mrtt > 0 && mrtt < TCP_RTT_MAX) |
| 515 | tcp_estimate_rtt (tc, mrtt); |
| 516 | } |
| 517 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 518 | /** |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 519 | * Dequeue bytes for connections that have received acks in last burst |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 520 | */ |
| 521 | static void |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 522 | tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 523 | { |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 524 | u32 thread_index = wrk->vm->thread_index; |
| 525 | u32 *pending_deq_acked; |
| 526 | tcp_connection_t *tc; |
| 527 | int i; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 528 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 529 | if (!vec_len (wrk->pending_deq_acked)) |
| 530 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 531 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 532 | pending_deq_acked = wrk->pending_deq_acked; |
| 533 | for (i = 0; i < vec_len (pending_deq_acked); i++) |
| 534 | { |
| 535 | tc = tcp_connection_get (pending_deq_acked[i], thread_index); |
| 536 | tc->flags &= ~TCP_CONN_DEQ_PENDING; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 537 | |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 538 | if (PREDICT_FALSE (!tc->burst_acked)) |
| 539 | continue; |
| 540 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 541 | /* Dequeue the newly ACKed bytes */ |
| 542 | stream_session_dequeue_drop (&tc->connection, tc->burst_acked); |
| 543 | tc->burst_acked = 0; |
| 544 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
| 545 | |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 546 | if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) |
| 547 | { |
| 548 | if (seq_leq (tc->psh_seq, tc->snd_una)) |
| 549 | tc->flags &= ~TCP_CONN_PSH_PENDING; |
| 550 | } |
| 551 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 552 | /* If everything has been acked, stop retransmit timer |
| 553 | * otherwise update. */ |
| 554 | tcp_retransmit_timer_update (tc); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 555 | |
| 556 | /* If not congested, update pacer based on our new |
| 557 | * cwnd estimate */ |
| 558 | if (!tcp_in_fastrecovery (tc)) |
| 559 | tcp_connection_tx_pacer_update (tc); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 560 | } |
| 561 | _vec_len (wrk->pending_deq_acked) = 0; |
| 562 | } |
| 563 | |
| 564 | static void |
| 565 | tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 566 | { |
| 567 | if (!(tc->flags & TCP_CONN_DEQ_PENDING)) |
| 568 | { |
| 569 | vec_add1 (wrk->pending_deq_acked, tc->c_c_index); |
| 570 | tc->flags |= TCP_CONN_DEQ_PENDING; |
| 571 | } |
| 572 | tc->burst_acked += tc->bytes_acked + tc->sack_sb.snd_una_adv; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 573 | } |
| 574 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 575 | /** |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 576 | * Check if duplicate ack as per RFC5681 Sec. 2 |
| 577 | */ |
| 578 | static u8 |
| 579 | tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, |
| 580 | u32 prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 581 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 582 | return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 583 | && seq_gt (tc->snd_una_max, tc->snd_una) |
| 584 | && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 585 | && (prev_snd_wnd == tc->snd_wnd)); |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * Checks if ack is a congestion control event. |
| 590 | */ |
| 591 | static u8 |
| 592 | tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, |
| 593 | u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) |
| 594 | { |
| 595 | /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are |
| 596 | * defined to be 'duplicate' */ |
| 597 | *is_dack = tc->sack_sb.last_sacked_bytes |
| 598 | || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); |
| 599 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 600 | 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] | 601 | } |
| 602 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 603 | static u32 |
| 604 | scoreboard_hole_index (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 605 | { |
| 606 | ASSERT (!pool_is_free_index (sb->holes, hole - sb->holes)); |
| 607 | return hole - sb->holes; |
| 608 | } |
| 609 | |
| 610 | static u32 |
| 611 | scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) |
| 612 | { |
| 613 | return hole->end - hole->start; |
| 614 | } |
| 615 | |
| 616 | sack_scoreboard_hole_t * |
| 617 | scoreboard_get_hole (sack_scoreboard_t * sb, u32 index) |
| 618 | { |
| 619 | if (index != TCP_INVALID_SACK_HOLE_INDEX) |
| 620 | return pool_elt_at_index (sb->holes, index); |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | sack_scoreboard_hole_t * |
| 625 | scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 626 | { |
| 627 | if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| 628 | return pool_elt_at_index (sb->holes, hole->next); |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | sack_scoreboard_hole_t * |
| 633 | scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 634 | { |
| 635 | if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) |
| 636 | return pool_elt_at_index (sb->holes, hole->prev); |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | sack_scoreboard_hole_t * |
| 641 | scoreboard_first_hole (sack_scoreboard_t * sb) |
| 642 | { |
| 643 | if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) |
| 644 | return pool_elt_at_index (sb->holes, sb->head); |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | sack_scoreboard_hole_t * |
| 649 | scoreboard_last_hole (sack_scoreboard_t * sb) |
| 650 | { |
| 651 | if (sb->tail != TCP_INVALID_SACK_HOLE_INDEX) |
| 652 | return pool_elt_at_index (sb->holes, sb->tail); |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | static void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 657 | scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 658 | { |
| 659 | sack_scoreboard_hole_t *next, *prev; |
| 660 | |
| 661 | if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| 662 | { |
| 663 | next = pool_elt_at_index (sb->holes, hole->next); |
| 664 | next->prev = hole->prev; |
| 665 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 666 | else |
| 667 | { |
| 668 | sb->tail = hole->prev; |
| 669 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 670 | |
| 671 | if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) |
| 672 | { |
| 673 | prev = pool_elt_at_index (sb->holes, hole->prev); |
| 674 | prev->next = hole->next; |
| 675 | } |
| 676 | else |
| 677 | { |
| 678 | sb->head = hole->next; |
| 679 | } |
| 680 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 681 | if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole) |
| 682 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 683 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 684 | /* Poison the entry */ |
| 685 | if (CLIB_DEBUG > 0) |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 686 | clib_memset (hole, 0xfe, sizeof (*hole)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 687 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 688 | pool_put (sb->holes, hole); |
| 689 | } |
| 690 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 691 | static sack_scoreboard_hole_t * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 692 | scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 693 | u32 start, u32 end) |
| 694 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 695 | sack_scoreboard_hole_t *hole, *next, *prev; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 696 | u32 hole_index; |
| 697 | |
| 698 | pool_get (sb->holes, hole); |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 699 | clib_memset (hole, 0, sizeof (*hole)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 700 | |
| 701 | hole->start = start; |
| 702 | hole->end = end; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 703 | hole_index = scoreboard_hole_index (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 704 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 705 | prev = scoreboard_get_hole (sb, prev_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 706 | if (prev) |
| 707 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 708 | hole->prev = prev_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 709 | hole->next = prev->next; |
| 710 | |
| 711 | if ((next = scoreboard_next_hole (sb, hole))) |
| 712 | next->prev = hole_index; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 713 | else |
| 714 | sb->tail = hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 715 | |
| 716 | prev->next = hole_index; |
| 717 | } |
| 718 | else |
| 719 | { |
| 720 | sb->head = hole_index; |
| 721 | hole->prev = TCP_INVALID_SACK_HOLE_INDEX; |
| 722 | hole->next = TCP_INVALID_SACK_HOLE_INDEX; |
| 723 | } |
| 724 | |
| 725 | return hole; |
| 726 | } |
| 727 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 728 | static void |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 729 | scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 730 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 731 | sack_scoreboard_hole_t *left, *right; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 732 | u32 bytes = 0, blks = 0; |
| 733 | |
| 734 | sb->lost_bytes = 0; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 735 | sb->sacked_bytes = 0; |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 736 | left = scoreboard_last_hole (sb); |
| 737 | if (!left) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 738 | return; |
| 739 | |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 740 | if (seq_gt (sb->high_sacked, left->end)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 741 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 742 | bytes = sb->high_sacked - left->end; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 743 | blks = 1; |
| 744 | } |
| 745 | |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 746 | while ((right = left) |
| 747 | && bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss |
| 748 | && blks < TCP_DUPACK_THRESHOLD |
| 749 | /* left not updated if above conditions fail */ |
| 750 | && (left = scoreboard_prev_hole (sb, right))) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 751 | { |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 752 | bytes += right->start - left->end; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 753 | blks++; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 756 | /* left is first lost */ |
| 757 | if (left) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 758 | { |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 759 | do |
| 760 | { |
| 761 | sb->lost_bytes += scoreboard_hole_bytes (right); |
| 762 | left->is_lost = 1; |
| 763 | left = scoreboard_prev_hole (sb, right); |
| 764 | if (left) |
| 765 | bytes += right->start - left->end; |
| 766 | } |
| 767 | while ((right = left)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 768 | } |
Florin Coras | 9f9e969 | 2018-10-19 17:49:00 -0700 | [diff] [blame] | 769 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 770 | sb->sacked_bytes = bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | /** |
| 774 | * Figure out the next hole to retransmit |
| 775 | * |
| 776 | * Follows logic proposed in RFC6675 Sec. 4, NextSeg() |
| 777 | */ |
| 778 | sack_scoreboard_hole_t * |
| 779 | scoreboard_next_rxt_hole (sack_scoreboard_t * sb, |
| 780 | sack_scoreboard_hole_t * start, |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 781 | u8 have_unsent, u8 * can_rescue, u8 * snd_limited) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 782 | { |
| 783 | sack_scoreboard_hole_t *hole = 0; |
| 784 | |
| 785 | hole = start ? start : scoreboard_first_hole (sb); |
| 786 | while (hole && seq_leq (hole->end, sb->high_rxt) && hole->is_lost) |
| 787 | hole = scoreboard_next_hole (sb, hole); |
| 788 | |
| 789 | /* Nothing, return */ |
| 790 | if (!hole) |
| 791 | { |
| 792 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | /* Rule (1): if higher than rxt, less than high_sacked and lost */ |
| 797 | if (hole->is_lost && seq_lt (hole->start, sb->high_sacked)) |
| 798 | { |
| 799 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 800 | } |
| 801 | else |
| 802 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 803 | /* Rule (2): available unsent data */ |
| 804 | if (have_unsent) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 805 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 806 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 807 | return 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 808 | } |
| 809 | /* Rule (3): if hole not lost */ |
| 810 | else if (seq_lt (hole->start, sb->high_sacked)) |
| 811 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 812 | *snd_limited = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 813 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 814 | } |
| 815 | /* Rule (4): if hole beyond high_sacked */ |
| 816 | else |
| 817 | { |
| 818 | ASSERT (seq_geq (hole->start, sb->high_sacked)); |
| 819 | *snd_limited = 1; |
| 820 | *can_rescue = 1; |
| 821 | /* HighRxt MUST NOT be updated */ |
| 822 | return 0; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | if (hole && seq_lt (sb->high_rxt, hole->start)) |
| 827 | sb->high_rxt = hole->start; |
| 828 | |
| 829 | return hole; |
| 830 | } |
| 831 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 832 | static void |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 833 | scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 snd_una) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 834 | { |
| 835 | sack_scoreboard_hole_t *hole; |
| 836 | hole = scoreboard_first_hole (sb); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 837 | if (hole) |
| 838 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 839 | snd_una = seq_gt (snd_una, hole->start) ? snd_una : hole->start; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 840 | sb->cur_rxt_hole = sb->head; |
| 841 | } |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 842 | sb->high_rxt = snd_una; |
| 843 | sb->rescue_rxt = snd_una - 1; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 844 | } |
| 845 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 846 | void |
| 847 | scoreboard_init (sack_scoreboard_t * sb) |
| 848 | { |
| 849 | sb->head = TCP_INVALID_SACK_HOLE_INDEX; |
| 850 | sb->tail = TCP_INVALID_SACK_HOLE_INDEX; |
| 851 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 852 | } |
| 853 | |
| 854 | void |
| 855 | scoreboard_clear (sack_scoreboard_t * sb) |
| 856 | { |
| 857 | sack_scoreboard_hole_t *hole; |
| 858 | while ((hole = scoreboard_first_hole (sb))) |
| 859 | { |
| 860 | scoreboard_remove_hole (sb, hole); |
| 861 | } |
| 862 | ASSERT (sb->head == sb->tail && sb->head == TCP_INVALID_SACK_HOLE_INDEX); |
| 863 | ASSERT (pool_elts (sb->holes) == 0); |
| 864 | sb->sacked_bytes = 0; |
| 865 | sb->last_sacked_bytes = 0; |
| 866 | sb->last_bytes_delivered = 0; |
| 867 | sb->snd_una_adv = 0; |
| 868 | sb->high_sacked = 0; |
| 869 | sb->high_rxt = 0; |
| 870 | sb->lost_bytes = 0; |
| 871 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 872 | } |
| 873 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 874 | /** |
| 875 | * Test that scoreboard is sane after recovery |
| 876 | * |
| 877 | * Returns 1 if scoreboard is empty or if first hole beyond |
| 878 | * snd_una. |
| 879 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 880 | static u8 |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 881 | tcp_scoreboard_is_sane_post_recovery (tcp_connection_t * tc) |
| 882 | { |
| 883 | sack_scoreboard_hole_t *hole; |
| 884 | hole = scoreboard_first_hole (&tc->sack_sb); |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 885 | return (!hole || (seq_geq (hole->start, tc->snd_una) |
| 886 | && seq_lt (hole->end, tc->snd_una_max))); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 890 | tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) |
| 891 | { |
| 892 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 893 | sack_block_t *blk, tmp; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 894 | sack_scoreboard_hole_t *hole, *next_hole, *last_hole; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 895 | u32 blk_index = 0, old_sacked_bytes, hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 896 | int i, j; |
| 897 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 898 | sb->last_sacked_bytes = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 899 | sb->last_bytes_delivered = 0; |
Florin Coras | 352c2c4 | 2018-06-26 01:22:41 -0700 | [diff] [blame] | 900 | sb->snd_una_adv = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 901 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 902 | if (!tcp_opts_sack (&tc->rcv_opts) |
| 903 | && sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 904 | return; |
| 905 | |
Florin Coras | 352c2c4 | 2018-06-26 01:22:41 -0700 | [diff] [blame] | 906 | old_sacked_bytes = sb->sacked_bytes; |
| 907 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 908 | /* Remove invalid blocks */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 909 | blk = tc->rcv_opts.sacks; |
| 910 | while (blk < vec_end (tc->rcv_opts.sacks)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 911 | { |
| 912 | if (seq_lt (blk->start, blk->end) |
| 913 | && seq_gt (blk->start, tc->snd_una) |
Florin Coras | ab86f86 | 2018-12-06 18:24:19 -0800 | [diff] [blame] | 914 | && seq_gt (blk->start, ack) |
| 915 | && seq_lt (blk->start, tc->snd_una_max) |
| 916 | && seq_leq (blk->end, tc->snd_una_max)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 917 | { |
| 918 | blk++; |
| 919 | continue; |
| 920 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 921 | vec_del1 (tc->rcv_opts.sacks, blk - tc->rcv_opts.sacks); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 922 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 923 | |
| 924 | /* Add block for cumulative ack */ |
| 925 | if (seq_gt (ack, tc->snd_una)) |
| 926 | { |
| 927 | tmp.start = tc->snd_una; |
| 928 | tmp.end = ack; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 929 | vec_add1 (tc->rcv_opts.sacks, tmp); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 930 | } |
| 931 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 932 | if (vec_len (tc->rcv_opts.sacks) == 0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 933 | return; |
| 934 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 935 | tcp_scoreboard_trace_add (tc, ack); |
| 936 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 937 | /* Make sure blocks are ordered */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 938 | for (i = 0; i < vec_len (tc->rcv_opts.sacks); i++) |
| 939 | for (j = i + 1; j < vec_len (tc->rcv_opts.sacks); j++) |
| 940 | 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] | 941 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 942 | tmp = tc->rcv_opts.sacks[i]; |
| 943 | tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j]; |
| 944 | tc->rcv_opts.sacks[j] = tmp; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 945 | } |
| 946 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 947 | if (sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
| 948 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 949 | /* If no holes, insert the first that covers all outstanding bytes */ |
| 950 | last_hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, |
| 951 | tc->snd_una, tc->snd_una_max); |
| 952 | sb->tail = scoreboard_hole_index (sb, last_hole); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 953 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
| 954 | sb->high_sacked = tmp.end; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 955 | } |
| 956 | else |
| 957 | { |
| 958 | /* If we have holes but snd_una_max is beyond the last hole, update |
| 959 | * last hole end */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 960 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 961 | last_hole = scoreboard_last_hole (sb); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 962 | if (seq_gt (tc->snd_una_max, last_hole->end)) |
| 963 | { |
| 964 | if (seq_geq (last_hole->start, sb->high_sacked)) |
| 965 | { |
| 966 | last_hole->end = tc->snd_una_max; |
| 967 | } |
| 968 | /* New hole after high sacked block */ |
| 969 | else if (seq_lt (sb->high_sacked, tc->snd_una_max)) |
| 970 | { |
| 971 | scoreboard_insert_hole (sb, sb->tail, sb->high_sacked, |
| 972 | tc->snd_una_max); |
| 973 | } |
| 974 | } |
| 975 | /* Keep track of max byte sacked for when the last hole |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 976 | * is acked */ |
| 977 | if (seq_gt (tmp.end, sb->high_sacked)) |
| 978 | sb->high_sacked = tmp.end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 979 | } |
| 980 | |
| 981 | /* Walk the holes with the SACK blocks */ |
| 982 | hole = pool_elt_at_index (sb->holes, sb->head); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 983 | while (hole && blk_index < vec_len (tc->rcv_opts.sacks)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 984 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 985 | blk = &tc->rcv_opts.sacks[blk_index]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 986 | if (seq_leq (blk->start, hole->start)) |
| 987 | { |
| 988 | /* Block covers hole. Remove hole */ |
| 989 | if (seq_geq (blk->end, hole->end)) |
| 990 | { |
| 991 | next_hole = scoreboard_next_hole (sb, hole); |
| 992 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 993 | /* Byte accounting: snd_una needs to be advanced */ |
| 994 | if (blk->end == ack) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 995 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 996 | if (next_hole) |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 997 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 998 | if (seq_lt (ack, next_hole->start)) |
| 999 | sb->snd_una_adv = next_hole->start - ack; |
| 1000 | sb->last_bytes_delivered += |
| 1001 | next_hole->start - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 1002 | } |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1003 | else |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 1004 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1005 | ASSERT (seq_geq (sb->high_sacked, ack)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1006 | sb->snd_una_adv = sb->high_sacked - ack; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1007 | sb->last_bytes_delivered += sb->high_sacked - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 1008 | } |
| 1009 | } |
| 1010 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1011 | scoreboard_remove_hole (sb, hole); |
| 1012 | hole = next_hole; |
| 1013 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1014 | /* Partial 'head' overlap */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1015 | else |
| 1016 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1017 | if (seq_gt (blk->end, hole->start)) |
| 1018 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1019 | hole->start = blk->end; |
| 1020 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1021 | blk_index++; |
| 1022 | } |
| 1023 | } |
| 1024 | else |
| 1025 | { |
| 1026 | /* Hole must be split */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1027 | if (seq_lt (blk->end, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1028 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1029 | hole_index = scoreboard_hole_index (sb, hole); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1030 | next_hole = scoreboard_insert_hole (sb, hole_index, blk->end, |
| 1031 | hole->end); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1032 | |
| 1033 | /* Pool might've moved */ |
| 1034 | hole = scoreboard_get_hole (sb, hole_index); |
| 1035 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1036 | blk_index++; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1037 | ASSERT (hole->next == scoreboard_hole_index (sb, next_hole)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1038 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1039 | else if (seq_lt (blk->start, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1040 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1041 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1042 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1043 | hole = scoreboard_next_hole (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1044 | } |
| 1045 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1046 | |
Florin Coras | ecbd20b | 2018-10-17 23:34:54 -0700 | [diff] [blame] | 1047 | if (pool_elts (sb->holes) == 1) |
| 1048 | { |
| 1049 | hole = scoreboard_first_hole (sb); |
| 1050 | if (hole->start == ack + sb->snd_una_adv |
| 1051 | && hole->end == tc->snd_una_max) |
| 1052 | scoreboard_remove_hole (sb, hole); |
| 1053 | } |
| 1054 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1055 | scoreboard_update_bytes (tc, sb); |
| 1056 | sb->last_sacked_bytes = sb->sacked_bytes |
| 1057 | - (old_sacked_bytes - sb->last_bytes_delivered); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1058 | ASSERT (sb->last_sacked_bytes <= sb->sacked_bytes || tcp_in_recovery (tc)); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1059 | ASSERT (sb->sacked_bytes == 0 || tcp_in_recovery (tc) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1060 | || sb->sacked_bytes < tc->snd_una_max - seq_max (tc->snd_una, ack)); |
| 1061 | ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_una_max |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1062 | - seq_max (tc->snd_una, ack) || tcp_in_recovery (tc)); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1063 | ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc) |
| 1064 | || sb->holes[sb->head].start == ack + sb->snd_una_adv); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1065 | TCP_EVT_DBG (TCP_EVT_CC_SCOREBOARD, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1066 | } |
| 1067 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1068 | /** |
| 1069 | * Try to update snd_wnd based on feedback received from peer. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1070 | * |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1071 | * If successful, and new window is 'effectively' 0, activate persist |
| 1072 | * timer. |
| 1073 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1074 | static void |
| 1075 | tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) |
| 1076 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1077 | /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set |
| 1078 | * 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] | 1079 | if (seq_lt (tc->snd_wl1, seq) |
| 1080 | || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1081 | { |
| 1082 | tc->snd_wnd = snd_wnd; |
| 1083 | tc->snd_wl1 = seq; |
| 1084 | tc->snd_wl2 = ack; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1085 | TCP_EVT_DBG (TCP_EVT_SND_WND, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1086 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1087 | if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1088 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1089 | /* Set persist timer if not set and we just got 0 wnd */ |
| 1090 | if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) |
| 1091 | && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1092 | tcp_persist_timer_set (tc); |
| 1093 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1094 | else |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1095 | { |
| 1096 | tcp_persist_timer_reset (tc); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1097 | if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1098 | { |
| 1099 | tc->rto_boff = 0; |
| 1100 | tcp_update_rto (tc); |
| 1101 | } |
| 1102 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1103 | } |
| 1104 | } |
| 1105 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1106 | /** |
| 1107 | * Init loss recovery/fast recovery. |
| 1108 | * |
| 1109 | * Triggered by dup acks as opposed to timer timeout. Note that cwnd is |
| 1110 | * updated in @ref tcp_cc_handle_event after fast retransmit |
| 1111 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1112 | void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1113 | tcp_cc_init_congestion (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1114 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1115 | tcp_fastrecovery_on (tc); |
| 1116 | tc->snd_congestion = tc->snd_una_max; |
Florin Coras | 6216600 | 2018-04-18 16:40:55 -0700 | [diff] [blame] | 1117 | tc->cwnd_acc_bytes = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1118 | tc->snd_rxt_bytes = 0; |
| 1119 | tc->prev_ssthresh = tc->ssthresh; |
| 1120 | tc->prev_cwnd = tc->cwnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1121 | tc->cc_algo->congestion (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1122 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1123 | } |
| 1124 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1125 | static void |
| 1126 | tcp_cc_recovery_exit (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1127 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1128 | tc->rto_boff = 0; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1129 | tcp_update_rto (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1130 | tc->snd_rxt_ts = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1131 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 1132 | tc->rtt_ts = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1133 | tcp_recovery_off (tc); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1134 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1135 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1136 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1137 | void |
| 1138 | tcp_cc_fastrecovery_exit (tcp_connection_t * tc) |
| 1139 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1140 | tc->cc_algo->recovered (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1141 | tc->snd_rxt_bytes = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1142 | tc->rcv_dupacks = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1143 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1144 | tc->snd_rxt_bytes = 0; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 1145 | tc->rtt_ts = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1146 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1147 | tcp_fastrecovery_off (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1148 | tcp_fastrecovery_first_off (tc); |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1149 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1150 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1154 | tcp_cc_congestion_undo (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1155 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1156 | tc->cwnd = tc->prev_cwnd; |
| 1157 | tc->ssthresh = tc->prev_ssthresh; |
| 1158 | tc->snd_nxt = tc->snd_una_max; |
| 1159 | tc->rcv_dupacks = 0; |
| 1160 | if (tcp_in_recovery (tc)) |
| 1161 | tcp_cc_recovery_exit (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1162 | else if (tcp_in_fastrecovery (tc)) |
| 1163 | tcp_cc_fastrecovery_exit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1164 | ASSERT (tc->rto_boff == 0); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1165 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1166 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1167 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1168 | static inline u8 |
| 1169 | tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1170 | { |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1171 | return (tcp_in_recovery (tc) && tc->rto_boff == 1 |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1172 | && tc->snd_rxt_ts |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1173 | && tcp_opts_tstamp (&tc->rcv_opts) |
| 1174 | && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); |
| 1175 | } |
| 1176 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1177 | static inline u8 |
| 1178 | tcp_cc_is_spurious_fast_rxt (tcp_connection_t * tc) |
| 1179 | { |
| 1180 | return (tcp_in_fastrecovery (tc) |
| 1181 | && tc->cwnd > tc->ssthresh + 3 * tc->snd_mss); |
| 1182 | } |
| 1183 | |
| 1184 | static u8 |
| 1185 | tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) |
| 1186 | { |
| 1187 | return (tcp_cc_is_spurious_timeout_rxt (tc) |
| 1188 | || tcp_cc_is_spurious_fast_rxt (tc)); |
| 1189 | } |
| 1190 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1191 | static int |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1192 | tcp_cc_recover (tcp_connection_t * tc) |
| 1193 | { |
| 1194 | ASSERT (tcp_in_cong_recovery (tc)); |
| 1195 | if (tcp_cc_is_spurious_retransmit (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1196 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1197 | tcp_cc_congestion_undo (tc); |
| 1198 | return 1; |
| 1199 | } |
| 1200 | |
| 1201 | if (tcp_in_recovery (tc)) |
| 1202 | tcp_cc_recovery_exit (tc); |
| 1203 | else if (tcp_in_fastrecovery (tc)) |
| 1204 | tcp_cc_fastrecovery_exit (tc); |
| 1205 | |
| 1206 | ASSERT (tc->rto_boff == 0); |
| 1207 | ASSERT (!tcp_in_cong_recovery (tc)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1208 | ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1209 | return 0; |
| 1210 | } |
| 1211 | |
| 1212 | static void |
| 1213 | tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b) |
| 1214 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1215 | ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1216 | |
| 1217 | /* Congestion avoidance */ |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1218 | tcp_cc_rcv_ack (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1219 | |
| 1220 | /* If a cumulative ack, make sure dupacks is 0 */ |
| 1221 | tc->rcv_dupacks = 0; |
| 1222 | |
| 1223 | /* When dupacks hits the threshold we only enter fast retransmit if |
| 1224 | * cumulative ack covers more than snd_congestion. Should snd_una |
| 1225 | * wrap this test may fail under otherwise valid circumstances. |
| 1226 | * Therefore, proactively update snd_congestion when wrap detected. */ |
| 1227 | if (PREDICT_FALSE |
| 1228 | (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked) |
| 1229 | && seq_gt (tc->snd_congestion, tc->snd_una))) |
| 1230 | tc->snd_congestion = tc->snd_una - 1; |
| 1231 | } |
| 1232 | |
| 1233 | static u8 |
| 1234 | tcp_should_fastrecover_sack (tcp_connection_t * tc) |
| 1235 | { |
| 1236 | return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes; |
| 1237 | } |
| 1238 | |
| 1239 | static u8 |
| 1240 | tcp_should_fastrecover (tcp_connection_t * tc) |
| 1241 | { |
| 1242 | return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD |
| 1243 | || tcp_should_fastrecover_sack (tc)); |
| 1244 | } |
| 1245 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1246 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1247 | tcp_program_fastretransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1248 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1249 | if (!(tc->flags & TCP_CONN_FRXT_PENDING)) |
| 1250 | { |
| 1251 | vec_add1 (wrk->pending_fast_rxt, tc->c_c_index); |
| 1252 | tc->flags |= TCP_CONN_FRXT_PENDING; |
| 1253 | } |
| 1254 | } |
| 1255 | |
| 1256 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1257 | tcp_do_fastretransmits (tcp_worker_ctx_t * wrk) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1258 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1259 | u32 *ongoing_fast_rxt, burst_bytes, sent_bytes, thread_index; |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1260 | u32 max_burst_size, burst_size, n_segs = 0, n_segs_now; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1261 | tcp_connection_t *tc; |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1262 | u64 last_cpu_time; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1263 | int i; |
| 1264 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1265 | if (vec_len (wrk->pending_fast_rxt) == 0 |
| 1266 | && vec_len (wrk->postponed_fast_rxt) == 0) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1267 | return; |
| 1268 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1269 | thread_index = wrk->vm->thread_index; |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1270 | last_cpu_time = wrk->vm->clib_time.last_cpu_time; |
| 1271 | ongoing_fast_rxt = wrk->ongoing_fast_rxt; |
| 1272 | vec_append (ongoing_fast_rxt, wrk->postponed_fast_rxt); |
| 1273 | vec_append (ongoing_fast_rxt, wrk->pending_fast_rxt); |
| 1274 | |
| 1275 | _vec_len (wrk->postponed_fast_rxt) = 0; |
| 1276 | _vec_len (wrk->pending_fast_rxt) = 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1277 | |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 1278 | max_burst_size = VLIB_FRAME_SIZE / vec_len (ongoing_fast_rxt); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1279 | max_burst_size = clib_max (max_burst_size, 1); |
| 1280 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1281 | for (i = 0; i < vec_len (ongoing_fast_rxt); i++) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1282 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1283 | if (n_segs >= VLIB_FRAME_SIZE) |
| 1284 | { |
| 1285 | vec_add1 (wrk->postponed_fast_rxt, ongoing_fast_rxt[i]); |
| 1286 | continue; |
| 1287 | } |
| 1288 | |
| 1289 | tc = tcp_connection_get (ongoing_fast_rxt[i], thread_index); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1290 | tc->flags &= ~TCP_CONN_FRXT_PENDING; |
| 1291 | |
| 1292 | if (!tcp_in_fastrecovery (tc)) |
| 1293 | continue; |
| 1294 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1295 | burst_size = clib_min (max_burst_size, VLIB_FRAME_SIZE - n_segs); |
| 1296 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection, |
| 1297 | last_cpu_time); |
| 1298 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1299 | if (!burst_size) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1300 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1301 | tcp_program_fastretransmit (wrk, tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1302 | continue; |
| 1303 | } |
| 1304 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1305 | n_segs_now = tcp_fast_retransmit (wrk, tc, burst_size); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1306 | sent_bytes = clib_min (n_segs_now * tc->snd_mss, burst_bytes); |
| 1307 | transport_connection_tx_pacer_update_bytes (&tc->connection, |
| 1308 | sent_bytes); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1309 | n_segs += n_segs_now; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1310 | } |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1311 | _vec_len (ongoing_fast_rxt) = 0; |
| 1312 | wrk->ongoing_fast_rxt = ongoing_fast_rxt; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1313 | } |
| 1314 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1315 | /** |
| 1316 | * One function to rule them all ... and in the darkness bind them |
| 1317 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1318 | static void |
| 1319 | tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack) |
| 1320 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1321 | u32 rxt_delivered; |
| 1322 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1323 | if (tcp_in_fastrecovery (tc) && tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 1324 | { |
| 1325 | if (tc->bytes_acked) |
| 1326 | goto partial_ack; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1327 | tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1328 | return; |
| 1329 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1330 | /* |
| 1331 | * Duplicate ACK. Check if we should enter fast recovery, or if already in |
| 1332 | * it account for the bytes that left the network. |
| 1333 | */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1334 | else if (is_dack && !tcp_in_recovery (tc)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1335 | { |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1336 | TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1337 | ASSERT (tc->snd_una != tc->snd_una_max |
| 1338 | || tc->sack_sb.last_sacked_bytes); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1339 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1340 | tc->rcv_dupacks++; |
| 1341 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1342 | /* Pure duplicate ack. If some data got acked, it's handled lower */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1343 | if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1344 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1345 | ASSERT (tcp_in_fastrecovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1346 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1347 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1348 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1349 | else if (tcp_should_fastrecover (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1350 | { |
Florin Coras | c44a558 | 2018-11-01 16:30:54 -0700 | [diff] [blame] | 1351 | u32 pacer_wnd; |
| 1352 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1353 | ASSERT (!tcp_in_fastrecovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1354 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1355 | /* Heuristic to catch potential late dupacks |
| 1356 | * after fast retransmit exits */ |
| 1357 | if (is_dack && tc->snd_una == tc->snd_congestion |
| 1358 | && timestamp_leq (tc->rcv_opts.tsecr, tc->tsecr_last_ack)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1359 | { |
| 1360 | tc->rcv_dupacks = 0; |
| 1361 | return; |
| 1362 | } |
| 1363 | |
| 1364 | tcp_cc_init_congestion (tc); |
| 1365 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1366 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1367 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1368 | { |
| 1369 | tc->cwnd = tc->ssthresh; |
| 1370 | scoreboard_init_high_rxt (&tc->sack_sb, tc->snd_una); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1371 | } |
| 1372 | else |
| 1373 | { |
| 1374 | /* Post retransmit update cwnd to ssthresh and account for the |
| 1375 | * three segments that have left the network and should've been |
| 1376 | * buffered at the receiver XXX */ |
| 1377 | tc->cwnd = tc->ssthresh + 3 * tc->snd_mss; |
| 1378 | } |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1379 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1380 | /* Constrain rate until we get a partial ack */ |
Florin Coras | c44a558 | 2018-11-01 16:30:54 -0700 | [diff] [blame] | 1381 | pacer_wnd = clib_max (0.1 * tc->cwnd, 2 * tc->snd_mss); |
| 1382 | tcp_connection_tx_pacer_reset (tc, pacer_wnd, |
| 1383 | 0 /* start bucket */ ); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1384 | tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), |
| 1385 | tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1386 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1387 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1388 | else if (!tc->bytes_acked |
| 1389 | || (tc->bytes_acked && !tcp_in_cong_recovery (tc))) |
| 1390 | { |
| 1391 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1392 | return; |
| 1393 | } |
| 1394 | else |
| 1395 | goto partial_ack; |
| 1396 | } |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1397 | /* Don't allow entry in fast recovery if still in recovery, for now */ |
| 1398 | else if (0 && is_dack && tcp_in_recovery (tc)) |
| 1399 | { |
| 1400 | /* If of of the two conditions lower hold, reset dupacks because |
| 1401 | * we're probably after timeout (RFC6582 heuristics). |
| 1402 | * If Cumulative ack does not cover more than congestion threshold, |
| 1403 | * and: |
| 1404 | * 1) The following doesn't hold: The congestion window is greater |
| 1405 | * than SMSS bytes and the difference between highest_ack |
| 1406 | * and prev_highest_ack is at most 4*SMSS bytes |
| 1407 | * 2) Echoed timestamp in the last non-dup ack does not equal the |
| 1408 | * stored timestamp |
| 1409 | */ |
| 1410 | if (seq_leq (tc->snd_una, tc->snd_congestion) |
| 1411 | && ((!(tc->cwnd > tc->snd_mss |
| 1412 | && tc->bytes_acked <= 4 * tc->snd_mss)) |
| 1413 | || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) |
| 1414 | { |
| 1415 | tc->rcv_dupacks = 0; |
| 1416 | return; |
| 1417 | } |
| 1418 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1419 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1420 | if (!tc->bytes_acked) |
| 1421 | return; |
| 1422 | |
| 1423 | partial_ack: |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1424 | TCP_EVT_DBG (TCP_EVT_CC_PACK, tc); |
| 1425 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1426 | /* |
| 1427 | * Legitimate ACK. 1) See if we can exit recovery |
| 1428 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1429 | |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 1430 | /* Update the pacing rate. For the first partial ack we move from |
| 1431 | * the artificially constrained rate to the one after congestion */ |
| 1432 | tcp_connection_tx_pacer_update (tc); |
| 1433 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1434 | if (seq_geq (tc->snd_una, tc->snd_congestion)) |
| 1435 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1436 | tcp_retransmit_timer_update (tc); |
| 1437 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1438 | /* If spurious return, we've already updated everything */ |
| 1439 | if (tcp_cc_recover (tc)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1440 | { |
| 1441 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 1442 | return; |
| 1443 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1444 | |
| 1445 | tc->snd_nxt = tc->snd_una_max; |
| 1446 | |
| 1447 | /* Treat as congestion avoidance ack */ |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1448 | tcp_cc_rcv_ack (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1449 | return; |
| 1450 | } |
| 1451 | |
| 1452 | /* |
| 1453 | * Legitimate ACK. 2) If PARTIAL ACK try to retransmit |
| 1454 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1455 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1456 | /* XXX limit this only to first partial ack? */ |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 1457 | tcp_retransmit_timer_update (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1458 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1459 | /* RFC6675: If the incoming ACK is a cumulative acknowledgment, |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1460 | * reset dupacks to 0. Also needed if in congestion recovery */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1461 | tc->rcv_dupacks = 0; |
| 1462 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1463 | /* Post RTO timeout don't try anything fancy */ |
| 1464 | if (tcp_in_recovery (tc)) |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1465 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1466 | tcp_cc_rcv_ack (tc); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1467 | transport_add_tx_event (&tc->connection); |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1468 | return; |
| 1469 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1470 | |
| 1471 | /* Remove retransmitted bytes that have been delivered */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1472 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1473 | { |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1474 | ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv |
| 1475 | >= tc->sack_sb.last_bytes_delivered |
| 1476 | || (tc->flags & TCP_CONN_FINSNT)); |
| 1477 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1478 | /* If we have sacks and we haven't gotten an ack beyond high_rxt, |
| 1479 | * remove sacked bytes delivered */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1480 | if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt)) |
| 1481 | { |
| 1482 | rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv |
| 1483 | - tc->sack_sb.last_bytes_delivered; |
| 1484 | ASSERT (tc->snd_rxt_bytes >= rxt_delivered); |
| 1485 | tc->snd_rxt_bytes -= rxt_delivered; |
| 1486 | } |
| 1487 | else |
| 1488 | { |
| 1489 | /* Apparently all retransmitted holes have been acked */ |
| 1490 | tc->snd_rxt_bytes = 0; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1491 | tc->sack_sb.high_rxt = tc->snd_una; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1492 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1493 | } |
| 1494 | else |
| 1495 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1496 | tcp_fastrecovery_first_on (tc); |
| 1497 | /* Reuse last bytes delivered to track total bytes acked */ |
| 1498 | tc->sack_sb.last_bytes_delivered += tc->bytes_acked; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1499 | if (tc->snd_rxt_bytes > tc->bytes_acked) |
| 1500 | tc->snd_rxt_bytes -= tc->bytes_acked; |
| 1501 | else |
| 1502 | tc->snd_rxt_bytes = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1503 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1504 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1505 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1506 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1507 | /* |
| 1508 | * Since this was a partial ack, try to retransmit some more data |
| 1509 | */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1510 | tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index), tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1511 | } |
| 1512 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1513 | /** |
| 1514 | * Process incoming ACK |
| 1515 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1516 | static int |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1517 | tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1518 | tcp_header_t * th, u32 * error) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1519 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1520 | u32 prev_snd_wnd, prev_snd_una; |
| 1521 | u8 is_dack; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1522 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1523 | TCP_EVT_DBG (TCP_EVT_CC_STAT, tc); |
| 1524 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1525 | /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1526 | 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] | 1527 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1528 | /* When we entered recovery, we reset snd_nxt to snd_una. Seems peer |
| 1529 | * still has the data so accept the ack */ |
| 1530 | if (tcp_in_recovery (tc) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1531 | && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_congestion)) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1532 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1533 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
| 1534 | if (seq_gt (tc->snd_nxt, tc->snd_una_max)) |
| 1535 | tc->snd_una_max = tc->snd_nxt; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1536 | goto process_ack; |
| 1537 | } |
| 1538 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1539 | /* If we have outstanding data and this is within the window, accept it, |
| 1540 | * probably retransmit has timed out. Otherwise ACK segment and then |
| 1541 | * drop it */ |
| 1542 | if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)) |
| 1543 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1544 | tcp_program_ack (wrk, tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1545 | *error = TCP_ERROR_ACK_FUTURE; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1546 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0, |
| 1547 | vnet_buffer (b)->tcp.ack_number); |
| 1548 | return -1; |
| 1549 | } |
| 1550 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1551 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 2, |
| 1552 | vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1553 | |
| 1554 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1555 | } |
| 1556 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1557 | /* If old ACK, probably it's an old dupack */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1558 | 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] | 1559 | { |
| 1560 | *error = TCP_ERROR_ACK_OLD; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1561 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 1, |
| 1562 | vnet_buffer (b)->tcp.ack_number); |
| 1563 | if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1564 | tcp_cc_handle_event (tc, 1); |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1565 | /* Don't drop yet */ |
| 1566 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1567 | } |
| 1568 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1569 | /* |
| 1570 | * Looks okay, process feedback |
| 1571 | */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1572 | process_ack: |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1573 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1574 | tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); |
| 1575 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1576 | prev_snd_wnd = tc->snd_wnd; |
| 1577 | prev_snd_una = tc->snd_una; |
| 1578 | tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, |
| 1579 | vnet_buffer (b)->tcp.ack_number, |
| 1580 | clib_net_to_host_u16 (th->window) << tc->snd_wscale); |
| 1581 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
| 1582 | tc->snd_una = vnet_buffer (b)->tcp.ack_number + tc->sack_sb.snd_una_adv; |
| 1583 | tcp_validate_txf_size (tc, tc->bytes_acked); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1584 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1585 | if (tc->bytes_acked) |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 1586 | { |
| 1587 | tcp_program_dequeue (wrk, tc); |
| 1588 | tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number); |
| 1589 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1590 | |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1591 | TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc); |
| 1592 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1593 | /* |
| 1594 | * Check if we have congestion event |
| 1595 | */ |
| 1596 | |
| 1597 | 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] | 1598 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1599 | tcp_cc_handle_event (tc, is_dack); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1600 | if (!tcp_in_cong_recovery (tc)) |
| 1601 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1602 | *error = TCP_ERROR_ACK_DUP; |
Florin Coras | ca09d07 | 2018-10-01 18:31:02 -0700 | [diff] [blame] | 1603 | if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th)) |
| 1604 | return 0; |
| 1605 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1606 | } |
| 1607 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1608 | /* |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1609 | * Update congestion control (slow start/congestion avoidance) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1610 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1611 | tcp_cc_update (tc, b); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1612 | *error = TCP_ERROR_ACK_OK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1613 | return 0; |
| 1614 | } |
| 1615 | |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 1616 | static void |
| 1617 | tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 1618 | { |
| 1619 | if (!tcp_disconnect_pending (tc)) |
| 1620 | { |
| 1621 | vec_add1 (wrk->pending_disconnects, tc->c_c_index); |
| 1622 | tcp_disconnect_pending_on (tc); |
| 1623 | } |
| 1624 | } |
| 1625 | |
| 1626 | static void |
| 1627 | tcp_handle_disconnects (tcp_worker_ctx_t * wrk) |
| 1628 | { |
| 1629 | u32 thread_index, *pending_disconnects; |
| 1630 | tcp_connection_t *tc; |
| 1631 | int i; |
| 1632 | |
| 1633 | if (!vec_len (wrk->pending_disconnects)) |
| 1634 | return; |
| 1635 | |
| 1636 | thread_index = wrk->vm->thread_index; |
| 1637 | pending_disconnects = wrk->pending_disconnects; |
| 1638 | for (i = 0; i < vec_len (pending_disconnects); i++) |
| 1639 | { |
| 1640 | tc = tcp_connection_get (pending_disconnects[i], thread_index); |
| 1641 | tcp_disconnect_pending_off (tc); |
| 1642 | stream_session_disconnect_notify (&tc->connection); |
| 1643 | } |
| 1644 | _vec_len (wrk->pending_disconnects) = 0; |
| 1645 | } |
| 1646 | |
| 1647 | static void |
| 1648 | tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b, |
| 1649 | u32 * error) |
| 1650 | { |
| 1651 | /* Enter CLOSE-WAIT and notify session. To avoid lingering |
| 1652 | * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ |
| 1653 | /* Account for the FIN if nothing else was received */ |
| 1654 | if (vnet_buffer (b)->tcp.data_len == 0) |
| 1655 | tc->rcv_nxt += 1; |
| 1656 | tcp_program_ack (wrk, tc); |
| 1657 | tc->state = TCP_STATE_CLOSE_WAIT; |
| 1658 | tcp_program_disconnect (wrk, tc); |
| 1659 | tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); |
| 1660 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc); |
| 1661 | *error = TCP_ERROR_FIN_RCVD; |
| 1662 | } |
| 1663 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1664 | static u8 |
| 1665 | tcp_sack_vector_is_sane (sack_block_t * sacks) |
| 1666 | { |
| 1667 | int i; |
| 1668 | for (i = 1; i < vec_len (sacks); i++) |
| 1669 | { |
| 1670 | if (sacks[i - 1].end == sacks[i].start) |
| 1671 | return 0; |
| 1672 | } |
| 1673 | return 1; |
| 1674 | } |
| 1675 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1676 | /** |
| 1677 | * Build SACK list as per RFC2018. |
| 1678 | * |
| 1679 | * Makes sure the first block contains the segment that generated the current |
| 1680 | * ACK and the following ones are the ones most recently reported in SACK |
| 1681 | * blocks. |
| 1682 | * |
| 1683 | * @param tc TCP connection for which the SACK list is updated |
| 1684 | * @param start Start sequence number of the newest SACK block |
| 1685 | * @param end End sequence of the newest SACK block |
| 1686 | */ |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1687 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1688 | tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end) |
| 1689 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1690 | sack_block_t *new_list = 0, *block = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1691 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1692 | |
| 1693 | /* If the first segment is ooo add it to the list. Last write might've moved |
| 1694 | * rcv_nxt over the first segment. */ |
| 1695 | if (seq_lt (tc->rcv_nxt, start)) |
| 1696 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1697 | vec_add2 (new_list, block, 1); |
| 1698 | block->start = start; |
| 1699 | block->end = end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1700 | } |
| 1701 | |
| 1702 | /* Find the blocks still worth keeping. */ |
| 1703 | for (i = 0; i < vec_len (tc->snd_sacks); i++) |
| 1704 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1705 | /* Discard if rcv_nxt advanced beyond current block */ |
| 1706 | if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1707 | continue; |
| 1708 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1709 | /* Merge or drop if segment overlapped by the new segment */ |
| 1710 | if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start) |
| 1711 | && seq_leq (tc->snd_sacks[i].start, new_list[0].end))) |
| 1712 | { |
| 1713 | if (seq_lt (tc->snd_sacks[i].start, new_list[0].start)) |
| 1714 | new_list[0].start = tc->snd_sacks[i].start; |
| 1715 | if (seq_lt (new_list[0].end, tc->snd_sacks[i].end)) |
| 1716 | new_list[0].end = tc->snd_sacks[i].end; |
| 1717 | continue; |
| 1718 | } |
| 1719 | |
| 1720 | /* Save to new SACK list if we have space. */ |
| 1721 | if (vec_len (new_list) < TCP_MAX_SACK_BLOCKS) |
| 1722 | { |
| 1723 | vec_add1 (new_list, tc->snd_sacks[i]); |
| 1724 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1725 | else |
| 1726 | { |
| 1727 | clib_warning ("sack discarded"); |
| 1728 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1729 | } |
| 1730 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1731 | ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1732 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1733 | /* Replace old vector with new one */ |
| 1734 | vec_free (tc->snd_sacks); |
| 1735 | tc->snd_sacks = new_list; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1736 | |
| 1737 | /* Segments should not 'touch' */ |
| 1738 | ASSERT (tcp_sack_vector_is_sane (tc->snd_sacks)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1739 | } |
| 1740 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1741 | u32 |
| 1742 | tcp_sack_list_bytes (tcp_connection_t * tc) |
| 1743 | { |
| 1744 | u32 bytes = 0, i; |
| 1745 | for (i = 0; i < vec_len (tc->snd_sacks); i++) |
| 1746 | bytes += tc->snd_sacks[i].end - tc->snd_sacks[i].start; |
| 1747 | return bytes; |
| 1748 | } |
| 1749 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1750 | /** Enqueue data for delivery to application */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1751 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1752 | tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1753 | u16 data_len) |
| 1754 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1755 | int written, error = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1756 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1757 | ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1758 | ASSERT (data_len); |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1759 | written = session_enqueue_stream_connection (&tc->connection, b, 0, |
| 1760 | 1 /* queue event */ , 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1761 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1762 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written); |
| 1763 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1764 | /* Update rcv_nxt */ |
| 1765 | if (PREDICT_TRUE (written == data_len)) |
| 1766 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1767 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1768 | } |
| 1769 | /* If more data written than expected, account for out-of-order bytes. */ |
| 1770 | else if (written > data_len) |
| 1771 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1772 | tc->rcv_nxt += written; |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1773 | TCP_EVT_DBG (TCP_EVT_CC_INPUT, tc, data_len, written); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1774 | } |
| 1775 | else if (written > 0) |
| 1776 | { |
| 1777 | /* We've written something but FIFO is probably full now */ |
| 1778 | tc->rcv_nxt += written; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1779 | error = TCP_ERROR_PARTIALLY_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1780 | } |
| 1781 | else |
| 1782 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1783 | return TCP_ERROR_FIFO_FULL; |
| 1784 | } |
| 1785 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1786 | /* Update SACK list if need be */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1787 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1788 | { |
| 1789 | /* Remove SACK blocks that have been delivered */ |
| 1790 | tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); |
| 1791 | } |
| 1792 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1793 | return error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1794 | } |
| 1795 | |
| 1796 | /** Enqueue out-of-order data */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1797 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1798 | tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1799 | u16 data_len) |
| 1800 | { |
| 1801 | stream_session_t *s0; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1802 | int rv, offset; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1803 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1804 | ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1805 | ASSERT (data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1806 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1807 | /* Enqueue out-of-order data with relative offset */ |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1808 | rv = session_enqueue_stream_connection (&tc->connection, b, |
| 1809 | vnet_buffer (b)->tcp.seq_number - |
| 1810 | tc->rcv_nxt, 0 /* queue event */ , |
| 1811 | 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1812 | |
| 1813 | /* Nothing written */ |
| 1814 | if (rv) |
| 1815 | { |
| 1816 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0); |
| 1817 | return TCP_ERROR_FIFO_FULL; |
| 1818 | } |
| 1819 | |
| 1820 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1821 | |
| 1822 | /* Update SACK list if in use */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1823 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1824 | { |
| 1825 | ooo_segment_t *newest; |
| 1826 | u32 start, end; |
| 1827 | |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1828 | s0 = session_get (tc->c_s_index, tc->c_thread_index); |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1829 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1830 | /* Get the newest segment from the fifo */ |
| 1831 | newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1832 | if (newest) |
| 1833 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1834 | offset = ooo_segment_offset (s0->server_rx_fifo, newest); |
| 1835 | ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); |
| 1836 | start = tc->rcv_nxt + offset; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1837 | end = start + ooo_segment_length (s0->server_rx_fifo, newest); |
| 1838 | tcp_update_sack_list (tc, start, end); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1839 | svm_fifo_newest_ooo_segment_reset (s0->server_rx_fifo); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1840 | TCP_EVT_DBG (TCP_EVT_CC_SACKS, tc); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1841 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1842 | } |
| 1843 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1844 | return TCP_ERROR_ENQUEUED_OOO; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1845 | } |
| 1846 | |
| 1847 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1848 | * Check if ACK could be delayed. If ack can be delayed, it should return |
| 1849 | * true for a full frame. If we're always acking return 0. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1850 | */ |
| 1851 | always_inline int |
| 1852 | tcp_can_delack (tcp_connection_t * tc) |
| 1853 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1854 | /* Send ack if ... */ |
| 1855 | if (TCP_ALWAYS_ACK |
| 1856 | /* just sent a rcv wnd 0 */ |
| 1857 | || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0 |
| 1858 | /* constrained to send ack */ |
| 1859 | || (tc->flags & TCP_CONN_SNDACK) != 0 |
| 1860 | /* we're almost out of tx wnd */ |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1861 | || tcp_available_cc_snd_space (tc) < 4 * tc->snd_mss) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1862 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1863 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1864 | return 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1865 | } |
| 1866 | |
| 1867 | static int |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1868 | tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) |
| 1869 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1870 | u32 discard, first = b->current_length; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1871 | vlib_main_t *vm = vlib_get_main (); |
| 1872 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1873 | /* Handle multi-buffer segments */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1874 | if (n_bytes_to_drop > b->current_length) |
| 1875 | { |
| 1876 | if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1877 | return -1; |
| 1878 | do |
| 1879 | { |
| 1880 | discard = clib_min (n_bytes_to_drop, b->current_length); |
| 1881 | vlib_buffer_advance (b, discard); |
| 1882 | b = vlib_get_buffer (vm, b->next_buffer); |
| 1883 | n_bytes_to_drop -= discard; |
| 1884 | } |
| 1885 | while (n_bytes_to_drop); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1886 | if (n_bytes_to_drop > first) |
| 1887 | b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1888 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1889 | else |
| 1890 | vlib_buffer_advance (b, n_bytes_to_drop); |
| 1891 | vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1892 | return 0; |
| 1893 | } |
| 1894 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1895 | /** |
| 1896 | * Receive buffer for connection and handle acks |
| 1897 | * |
| 1898 | * It handles both in order or out-of-order data. |
| 1899 | */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1900 | static int |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1901 | tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1902 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1903 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1904 | u32 error, n_bytes_to_drop, n_data_bytes; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1905 | |
| 1906 | vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); |
| 1907 | n_data_bytes = vnet_buffer (b)->tcp.data_len; |
| 1908 | ASSERT (n_data_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1909 | |
| 1910 | /* Handle out-of-order data */ |
| 1911 | if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) |
| 1912 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1913 | /* Old sequence numbers allowed through because they overlapped |
| 1914 | * the rx window */ |
| 1915 | if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1916 | { |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1917 | /* Completely in the past (possible retransmit). Ack |
| 1918 | * retransmissions since we may not have any data to send */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1919 | if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1920 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1921 | tcp_program_ack (wrk, tc); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1922 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1923 | goto done; |
| 1924 | } |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1925 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1926 | /* Chop off the bytes in the past and see if what is left |
| 1927 | * can be enqueued in order */ |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1928 | n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; |
| 1929 | n_data_bytes -= n_bytes_to_drop; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1930 | vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1931 | if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1932 | { |
| 1933 | error = TCP_ERROR_SEGMENT_OLD; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1934 | goto done; |
| 1935 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1936 | goto in_order; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1937 | } |
| 1938 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 1939 | /* RFC2581: Enqueue and send DUPACK for fast retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1940 | error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1941 | tcp_program_dupack (wrk, tc); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1942 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1943 | goto done; |
| 1944 | } |
| 1945 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1946 | in_order: |
| 1947 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1948 | /* In order data, enqueue. Fifo figures out by itself if any out-of-order |
| 1949 | * segments can be enqueued after fifo tail offset changes. */ |
| 1950 | error = tcp_session_enqueue_data (tc, b, n_data_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1951 | if (tcp_can_delack (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1952 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1953 | if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)) |
| 1954 | tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1955 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1956 | } |
| 1957 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1958 | tcp_program_ack (wrk, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1959 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1960 | done: |
| 1961 | return error; |
| 1962 | } |
| 1963 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1964 | typedef struct |
| 1965 | { |
| 1966 | tcp_header_t tcp_header; |
| 1967 | tcp_connection_t tcp_connection; |
| 1968 | } tcp_rx_trace_t; |
| 1969 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1970 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1971 | format_tcp_rx_trace (u8 * s, va_list * args) |
| 1972 | { |
| 1973 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1974 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1975 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 1976 | u32 indent = format_get_indent (s); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1977 | |
| 1978 | s = format (s, "%U\n%U%U", |
| 1979 | format_tcp_header, &t->tcp_header, 128, |
| 1980 | format_white_space, indent, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1981 | format_tcp_connection, &t->tcp_connection, 1); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1982 | |
| 1983 | return s; |
| 1984 | } |
| 1985 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1986 | static u8 * |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1987 | format_tcp_rx_trace_short (u8 * s, va_list * args) |
| 1988 | { |
| 1989 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1990 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1991 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1992 | |
| 1993 | s = format (s, "%d -> %d (%U)", |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 1994 | clib_net_to_host_u16 (t->tcp_header.dst_port), |
| 1995 | 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] | 1996 | t->tcp_connection.state); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1997 | |
| 1998 | return s; |
| 1999 | } |
| 2000 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2001 | static void |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2002 | tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, |
| 2003 | tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) |
| 2004 | { |
| 2005 | if (tc0) |
| 2006 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2007 | clib_memcpy_fast (&t0->tcp_connection, tc0, |
| 2008 | sizeof (t0->tcp_connection)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2009 | } |
| 2010 | else |
| 2011 | { |
| 2012 | th0 = tcp_buffer_hdr (b0); |
| 2013 | } |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2014 | clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2015 | } |
| 2016 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2017 | static void |
| 2018 | tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2019 | vlib_frame_t * frame, u8 is_ip4) |
| 2020 | { |
| 2021 | u32 *from, n_left; |
| 2022 | |
| 2023 | n_left = frame->n_vectors; |
| 2024 | from = vlib_frame_vector_args (frame); |
| 2025 | |
| 2026 | while (n_left >= 1) |
| 2027 | { |
| 2028 | tcp_connection_t *tc0; |
| 2029 | tcp_rx_trace_t *t0; |
| 2030 | tcp_header_t *th0; |
| 2031 | vlib_buffer_t *b0; |
| 2032 | u32 bi0; |
| 2033 | |
| 2034 | bi0 = from[0]; |
| 2035 | b0 = vlib_get_buffer (vm, bi0); |
| 2036 | |
| 2037 | if (b0->flags & VLIB_BUFFER_IS_TRACED) |
| 2038 | { |
| 2039 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2040 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2041 | vm->thread_index); |
| 2042 | th0 = tcp_buffer_hdr (b0); |
| 2043 | tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); |
| 2044 | } |
| 2045 | |
| 2046 | from += 1; |
| 2047 | n_left -= 1; |
| 2048 | } |
| 2049 | } |
| 2050 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2051 | always_inline void |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2052 | tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node, |
| 2053 | u8 is_ip4, u32 evt, u32 val) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2054 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2055 | if (is_ip4) |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2056 | vlib_node_increment_counter (vm, tcp4_node, evt, val); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2057 | else |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2058 | vlib_node_increment_counter (vm, tcp6_node, evt, val); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2059 | } |
| 2060 | |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2061 | #define tcp_maybe_inc_counter(node_id, err, count) \ |
| 2062 | { \ |
| 2063 | if (next0 != tcp_next_drop (is_ip4)) \ |
| 2064 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 2065 | tcp6_##node_id##_node.index, is_ip4, err, \ |
| 2066 | 1); \ |
| 2067 | } |
| 2068 | #define tcp_inc_counter(node_id, err, count) \ |
| 2069 | tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \ |
| 2070 | tcp6_##node_id##_node.index, is_ip4, \ |
| 2071 | err, count) |
| 2072 | #define tcp_maybe_inc_err_counter(cnts, err) \ |
| 2073 | { \ |
| 2074 | cnts[err] += (next0 != tcp_next_drop (is_ip4)); \ |
| 2075 | } |
| 2076 | #define tcp_inc_err_counter(cnts, err, val) \ |
| 2077 | { \ |
| 2078 | cnts[err] += val; \ |
| 2079 | } |
| 2080 | #define tcp_store_err_counters(node_id, cnts) \ |
| 2081 | { \ |
| 2082 | int i; \ |
| 2083 | for (i = 0; i < TCP_N_ERROR; i++) \ |
| 2084 | if (cnts[i]) \ |
| 2085 | tcp_inc_counter(node_id, i, cnts[i]); \ |
| 2086 | } |
| 2087 | |
| 2088 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2089 | always_inline uword |
| 2090 | tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2091 | vlib_frame_t * frame, int is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2092 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2093 | u32 thread_index = vm->thread_index, errors = 0; |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2094 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2095 | u32 n_left_from, *from, *first_buffer; |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2096 | u16 err_counters[TCP_N_ERROR] = { 0 }; |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 2097 | u8 is_fin = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2098 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2099 | if (node->flags & VLIB_NODE_FLAG_TRACE) |
| 2100 | tcp_established_trace_frame (vm, node, frame, is_ip4); |
| 2101 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2102 | first_buffer = from = vlib_frame_vector_args (frame); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2103 | n_left_from = frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2104 | |
| 2105 | while (n_left_from > 0) |
| 2106 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2107 | u32 bi0, error0 = TCP_ERROR_ACK_OK; |
| 2108 | vlib_buffer_t *b0; |
| 2109 | tcp_header_t *th0 = 0; |
| 2110 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2111 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2112 | if (n_left_from > 1) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2113 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2114 | vlib_buffer_t *pb; |
| 2115 | pb = vlib_get_buffer (vm, from[1]); |
| 2116 | vlib_prefetch_buffer_header (pb, LOAD); |
| 2117 | CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2118 | } |
| 2119 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2120 | bi0 = from[0]; |
| 2121 | from += 1; |
| 2122 | n_left_from -= 1; |
| 2123 | |
| 2124 | b0 = vlib_get_buffer (vm, bi0); |
| 2125 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2126 | thread_index); |
| 2127 | |
| 2128 | if (PREDICT_FALSE (tc0 == 0)) |
| 2129 | { |
| 2130 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2131 | goto done; |
| 2132 | } |
| 2133 | |
| 2134 | th0 = tcp_buffer_hdr (b0); |
| 2135 | /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a |
| 2136 | * dangling reference. */ |
| 2137 | is_fin = tcp_is_fin (th0); |
| 2138 | |
| 2139 | /* SYNs, FINs and data consume sequence numbers */ |
| 2140 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
| 2141 | + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len; |
| 2142 | |
| 2143 | /* TODO header prediction fast path */ |
| 2144 | |
| 2145 | /* 1-4: check SEQ, RST, SYN */ |
| 2146 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, th0, &error0))) |
| 2147 | { |
| 2148 | TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp); |
| 2149 | goto done; |
| 2150 | } |
| 2151 | |
| 2152 | /* 5: check the ACK field */ |
| 2153 | if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0))) |
| 2154 | goto done; |
| 2155 | |
| 2156 | /* 6: check the URG bit TODO */ |
| 2157 | |
| 2158 | /* 7: process the segment text */ |
| 2159 | if (vnet_buffer (b0)->tcp.data_len) |
| 2160 | error0 = tcp_segment_rcv (wrk, tc0, b0); |
| 2161 | |
| 2162 | /* 8: check the FIN bit */ |
| 2163 | if (PREDICT_FALSE (is_fin)) |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 2164 | tcp_rcv_fin (wrk, tc0, b0, &error0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2165 | |
| 2166 | done: |
| 2167 | tcp_inc_err_counter (err_counters, error0, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2168 | } |
| 2169 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2170 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2171 | thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2172 | err_counters[TCP_ERROR_EVENT_FIFO_FULL] = errors; |
| 2173 | tcp_store_err_counters (established, err_counters); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2174 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | b11175d | 2018-11-09 14:34:08 -0800 | [diff] [blame] | 2175 | tcp_handle_disconnects (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2176 | vlib_buffer_free (vm, first_buffer, frame->n_vectors); |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 2177 | |
| 2178 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2179 | } |
| 2180 | |
| 2181 | static uword |
| 2182 | tcp4_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2183 | vlib_frame_t * from_frame) |
| 2184 | { |
| 2185 | return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2186 | } |
| 2187 | |
| 2188 | static uword |
| 2189 | tcp6_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2190 | vlib_frame_t * from_frame) |
| 2191 | { |
| 2192 | return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2193 | } |
| 2194 | |
| 2195 | /* *INDENT-OFF* */ |
| 2196 | VLIB_REGISTER_NODE (tcp4_established_node) = |
| 2197 | { |
| 2198 | .function = tcp4_established, |
| 2199 | .name = "tcp4-established", |
| 2200 | /* Takes a vector of packets. */ |
| 2201 | .vector_size = sizeof (u32), |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2202 | .n_errors = TCP_N_ERROR, |
| 2203 | .error_strings = tcp_error_strings, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2204 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 2205 | .next_nodes = |
| 2206 | { |
| 2207 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 2208 | foreach_tcp_state_next |
| 2209 | #undef _ |
| 2210 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2211 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2212 | }; |
| 2213 | /* *INDENT-ON* */ |
| 2214 | |
| 2215 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_established_node, tcp4_established); |
| 2216 | |
| 2217 | /* *INDENT-OFF* */ |
| 2218 | VLIB_REGISTER_NODE (tcp6_established_node) = |
| 2219 | { |
| 2220 | .function = tcp6_established, |
| 2221 | .name = "tcp6-established", |
| 2222 | /* Takes a vector of packets. */ |
| 2223 | .vector_size = sizeof (u32), |
| 2224 | .n_errors = TCP_N_ERROR, |
| 2225 | .error_strings = tcp_error_strings, |
| 2226 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 2227 | .next_nodes = |
| 2228 | { |
| 2229 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 2230 | foreach_tcp_state_next |
| 2231 | #undef _ |
| 2232 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2233 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2234 | }; |
| 2235 | /* *INDENT-ON* */ |
| 2236 | |
| 2237 | |
| 2238 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established); |
| 2239 | |
| 2240 | vlib_node_registration_t tcp4_syn_sent_node; |
| 2241 | vlib_node_registration_t tcp6_syn_sent_node; |
| 2242 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2243 | static u8 |
| 2244 | tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) |
| 2245 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2246 | transport_connection_t *tmp = 0; |
| 2247 | u64 handle; |
| 2248 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2249 | if (!tc) |
| 2250 | return 1; |
| 2251 | |
Florin Coras | 7013113 | 2017-11-27 02:43:30 -0800 | [diff] [blame] | 2252 | /* Proxy case */ |
| 2253 | if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN) |
| 2254 | return 1; |
| 2255 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2256 | u8 is_valid = (tc->c_lcl_port == hdr->dst_port |
| 2257 | && (tc->state == TCP_STATE_LISTEN |
| 2258 | || tc->c_rmt_port == hdr->src_port)); |
| 2259 | |
| 2260 | if (!is_valid) |
| 2261 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2262 | handle = session_lookup_half_open_handle (&tc->connection); |
| 2263 | tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF, |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2264 | tc->c_proto, tc->c_is_ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2265 | |
| 2266 | if (tmp) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2267 | { |
| 2268 | if (tmp->lcl_port == hdr->dst_port |
| 2269 | && tmp->rmt_port == hdr->src_port) |
| 2270 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2271 | TCP_DBG ("half-open is valid!"); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2272 | } |
| 2273 | } |
| 2274 | } |
| 2275 | return is_valid; |
| 2276 | } |
| 2277 | |
| 2278 | /** |
| 2279 | * Lookup transport connection |
| 2280 | */ |
| 2281 | static tcp_connection_t * |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2282 | tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index, |
| 2283 | u8 is_ip4) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2284 | { |
| 2285 | tcp_header_t *tcp; |
| 2286 | transport_connection_t *tconn; |
| 2287 | tcp_connection_t *tc; |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2288 | u8 is_filtered = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2289 | if (is_ip4) |
| 2290 | { |
| 2291 | ip4_header_t *ip4; |
| 2292 | ip4 = vlib_buffer_get_current (b); |
| 2293 | tcp = ip4_next_header (ip4); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2294 | tconn = session_lookup_connection_wt4 (fib_index, |
| 2295 | &ip4->dst_address, |
| 2296 | &ip4->src_address, |
| 2297 | tcp->dst_port, |
| 2298 | tcp->src_port, |
| 2299 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2300 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2301 | tc = tcp_get_connection_from_transport (tconn); |
| 2302 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 2303 | } |
| 2304 | else |
| 2305 | { |
| 2306 | ip6_header_t *ip6; |
| 2307 | ip6 = vlib_buffer_get_current (b); |
| 2308 | tcp = ip6_next_header (ip6); |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2309 | tconn = session_lookup_connection_wt6 (fib_index, |
| 2310 | &ip6->dst_address, |
| 2311 | &ip6->src_address, |
| 2312 | tcp->dst_port, |
| 2313 | tcp->src_port, |
| 2314 | TRANSPORT_PROTO_TCP, |
Florin Coras | dff48db | 2017-11-19 18:06:58 -0800 | [diff] [blame] | 2315 | thread_index, &is_filtered); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2316 | tc = tcp_get_connection_from_transport (tconn); |
| 2317 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 2318 | } |
| 2319 | return tc; |
| 2320 | } |
| 2321 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2322 | always_inline uword |
| 2323 | tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2324 | vlib_frame_t * from_frame, int is_ip4) |
| 2325 | { |
| 2326 | tcp_main_t *tm = vnet_get_tcp_main (); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2327 | u32 n_left_from, *from, *first_buffer, errors = 0; |
| 2328 | u32 my_thread_index = vm->thread_index; |
| 2329 | tcp_worker_ctx_t *wrk = tcp_get_worker (my_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2330 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2331 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2332 | n_left_from = from_frame->n_vectors; |
| 2333 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2334 | while (n_left_from > 0) |
| 2335 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2336 | u32 bi0, ack0, seq0, error0 = TCP_ERROR_NONE; |
| 2337 | tcp_connection_t *tc0, *new_tc0; |
| 2338 | tcp_header_t *tcp0 = 0; |
| 2339 | tcp_rx_trace_t *t0; |
| 2340 | vlib_buffer_t *b0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2341 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2342 | bi0 = from[0]; |
| 2343 | from += 1; |
| 2344 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2345 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2346 | b0 = vlib_get_buffer (vm, bi0); |
| 2347 | tc0 = |
| 2348 | tcp_half_open_connection_get (vnet_buffer (b0)->tcp.connection_index); |
| 2349 | if (PREDICT_FALSE (tc0 == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2350 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2351 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2352 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2353 | } |
| 2354 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2355 | /* Half-open completed recently but the connection was't removed |
| 2356 | * yet by the owning thread */ |
| 2357 | if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) |
| 2358 | { |
| 2359 | /* Make sure the connection actually exists */ |
| 2360 | ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0, |
| 2361 | my_thread_index, is_ip4)); |
| 2362 | goto drop; |
| 2363 | } |
| 2364 | |
| 2365 | ack0 = vnet_buffer (b0)->tcp.ack_number; |
| 2366 | seq0 = vnet_buffer (b0)->tcp.seq_number; |
| 2367 | tcp0 = tcp_buffer_hdr (b0); |
| 2368 | |
| 2369 | /* Crude check to see if the connection handle does not match |
| 2370 | * the packet. Probably connection just switched to established */ |
| 2371 | if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port |
| 2372 | || tcp0->src_port != tc0->c_rmt_port)) |
| 2373 | { |
| 2374 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2375 | goto drop; |
| 2376 | } |
| 2377 | |
| 2378 | if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0) |
| 2379 | && !tcp_syn (tcp0))) |
| 2380 | { |
| 2381 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 2382 | goto drop; |
| 2383 | } |
| 2384 | |
| 2385 | /* SYNs, FINs and data consume sequence numbers */ |
| 2386 | vnet_buffer (b0)->tcp.seq_end = |
| 2387 | seq0 + tcp_is_syn (tcp0) + tcp_is_fin (tcp0) + |
| 2388 | vnet_buffer (b0)->tcp.data_len; |
| 2389 | |
| 2390 | /* |
| 2391 | * 1. check the ACK bit |
| 2392 | */ |
| 2393 | |
| 2394 | /* |
| 2395 | * If the ACK bit is set |
| 2396 | * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless |
| 2397 | * the RST bit is set, if so drop the segment and return) |
| 2398 | * <SEQ=SEG.ACK><CTL=RST> |
| 2399 | * and discard the segment. Return. |
| 2400 | * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. |
| 2401 | */ |
| 2402 | if (tcp_ack (tcp0)) |
| 2403 | { |
| 2404 | if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) |
| 2405 | { |
| 2406 | if (!tcp_rst (tcp0)) |
| 2407 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
| 2408 | error0 = TCP_ERROR_RCV_WND; |
| 2409 | goto drop; |
| 2410 | } |
| 2411 | |
| 2412 | /* Make sure ACK is valid */ |
| 2413 | if (seq_gt (tc0->snd_una, ack0)) |
| 2414 | { |
| 2415 | error0 = TCP_ERROR_ACK_INVALID; |
| 2416 | goto drop; |
| 2417 | } |
| 2418 | } |
| 2419 | |
| 2420 | /* |
| 2421 | * 2. check the RST bit |
| 2422 | */ |
| 2423 | |
| 2424 | if (tcp_rst (tcp0)) |
| 2425 | { |
| 2426 | /* If ACK is acceptable, signal client that peer is not |
| 2427 | * willing to accept connection and drop connection*/ |
| 2428 | if (tcp_ack (tcp0)) |
| 2429 | tcp_connection_reset (tc0); |
| 2430 | error0 = TCP_ERROR_RST_RCVD; |
| 2431 | goto drop; |
| 2432 | } |
| 2433 | |
| 2434 | /* |
| 2435 | * 3. check the security and precedence (skipped) |
| 2436 | */ |
| 2437 | |
| 2438 | /* |
| 2439 | * 4. check the SYN bit |
| 2440 | */ |
| 2441 | |
| 2442 | /* No SYN flag. Drop. */ |
| 2443 | if (!tcp_syn (tcp0)) |
| 2444 | { |
| 2445 | clib_warning ("not synack"); |
| 2446 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 2447 | goto drop; |
| 2448 | } |
| 2449 | |
| 2450 | /* Parse options */ |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 2451 | if (tcp_options_parse (tcp0, &tc0->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2452 | { |
| 2453 | clib_warning ("options parse fail"); |
| 2454 | error0 = TCP_ERROR_OPTIONS; |
| 2455 | goto drop; |
| 2456 | } |
| 2457 | |
| 2458 | /* Valid SYN or SYN-ACK. Move connection from half-open pool to |
| 2459 | * current thread pool. */ |
| 2460 | pool_get (tm->connections[my_thread_index], new_tc0); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2461 | clib_memcpy_fast (new_tc0, tc0, sizeof (*new_tc0)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2462 | new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index]; |
| 2463 | new_tc0->c_thread_index = my_thread_index; |
| 2464 | new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; |
| 2465 | new_tc0->irs = seq0; |
| 2466 | new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; |
| 2467 | new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; |
| 2468 | new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; |
| 2469 | |
| 2470 | /* If this is not the owning thread, wait for syn retransmit to |
| 2471 | * expire and cleanup then */ |
| 2472 | if (tcp_half_open_connection_cleanup (tc0)) |
| 2473 | tc0->flags |= TCP_CONN_HALF_OPEN_DONE; |
| 2474 | |
| 2475 | if (tcp_opts_tstamp (&new_tc0->rcv_opts)) |
| 2476 | { |
| 2477 | new_tc0->tsval_recent = new_tc0->rcv_opts.tsval; |
| 2478 | new_tc0->tsval_recent_age = tcp_time_now (); |
| 2479 | } |
| 2480 | |
| 2481 | if (tcp_opts_wscale (&new_tc0->rcv_opts)) |
| 2482 | new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 2483 | else |
| 2484 | new_tc0->rcv_wscale = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2485 | |
| 2486 | new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
| 2487 | << new_tc0->snd_wscale; |
| 2488 | new_tc0->snd_wl1 = seq0; |
| 2489 | new_tc0->snd_wl2 = ack0; |
| 2490 | |
| 2491 | tcp_connection_init_vars (new_tc0); |
| 2492 | |
| 2493 | /* SYN-ACK: See if we can switch to ESTABLISHED state */ |
| 2494 | if (PREDICT_TRUE (tcp_ack (tcp0))) |
| 2495 | { |
| 2496 | /* Our SYN is ACKed: we have iss < ack = snd_una */ |
| 2497 | |
| 2498 | /* TODO Dequeue acknowledged segments if we support Fast Open */ |
| 2499 | new_tc0->snd_una = ack0; |
| 2500 | new_tc0->state = TCP_STATE_ESTABLISHED; |
| 2501 | |
| 2502 | /* Make sure las is initialized for the wnd computation */ |
| 2503 | new_tc0->rcv_las = new_tc0->rcv_nxt; |
| 2504 | |
| 2505 | /* Notify app that we have connection. If session layer can't |
| 2506 | * allocate session send reset */ |
| 2507 | if (session_stream_connect_notify (&new_tc0->connection, 0)) |
| 2508 | { |
| 2509 | clib_warning ("connect notify fail"); |
| 2510 | tcp_send_reset_w_pkt (new_tc0, b0, is_ip4); |
| 2511 | tcp_connection_cleanup (new_tc0); |
| 2512 | goto drop; |
| 2513 | } |
| 2514 | |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 2515 | new_tc0->tx_fifo_size = |
| 2516 | transport_tx_fifo_size (&new_tc0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2517 | /* Update rtt with the syn-ack sample */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2518 | tcp_estimate_initial_rtt (new_tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2519 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0); |
| 2520 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 2521 | } |
| 2522 | /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ |
| 2523 | else |
| 2524 | { |
| 2525 | new_tc0->state = TCP_STATE_SYN_RCVD; |
| 2526 | |
| 2527 | /* Notify app that we have connection */ |
| 2528 | if (session_stream_connect_notify (&new_tc0->connection, 0)) |
| 2529 | { |
| 2530 | tcp_connection_cleanup (new_tc0); |
| 2531 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
| 2532 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0); |
| 2533 | goto drop; |
| 2534 | } |
| 2535 | |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 2536 | new_tc0->tx_fifo_size = |
| 2537 | transport_tx_fifo_size (&new_tc0->connection); |
| 2538 | new_tc0->rtt_ts = 0; |
| 2539 | tcp_init_snd_vars (new_tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2540 | tcp_send_synack (new_tc0); |
| 2541 | error0 = TCP_ERROR_SYNS_RCVD; |
| 2542 | goto drop; |
| 2543 | } |
| 2544 | |
| 2545 | /* Read data, if any */ |
| 2546 | if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) |
| 2547 | { |
| 2548 | clib_warning ("rcvd data in syn-sent"); |
| 2549 | error0 = tcp_segment_rcv (wrk, new_tc0, b0); |
| 2550 | if (error0 == TCP_ERROR_ACK_OK) |
| 2551 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 2552 | } |
| 2553 | else |
| 2554 | { |
| 2555 | tcp_program_ack (wrk, new_tc0); |
| 2556 | } |
| 2557 | |
| 2558 | drop: |
| 2559 | |
| 2560 | tcp_inc_counter (syn_sent, error0, 1); |
| 2561 | if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0)) |
| 2562 | { |
| 2563 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2564 | clib_memcpy_fast (&t0->tcp_header, tcp0, sizeof (t0->tcp_header)); |
| 2565 | clib_memcpy_fast (&t0->tcp_connection, tc0, |
| 2566 | sizeof (t0->tcp_connection)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2567 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2568 | } |
| 2569 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2570 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
| 2571 | my_thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2572 | tcp_inc_counter (syn_sent, TCP_ERROR_EVENT_FIFO_FULL, errors); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2573 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
| 2574 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2575 | return from_frame->n_vectors; |
| 2576 | } |
| 2577 | |
| 2578 | static uword |
| 2579 | tcp4_syn_sent (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2580 | vlib_frame_t * from_frame) |
| 2581 | { |
| 2582 | return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2583 | } |
| 2584 | |
| 2585 | static uword |
| 2586 | tcp6_syn_sent_rcv (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2587 | vlib_frame_t * from_frame) |
| 2588 | { |
| 2589 | return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2590 | } |
| 2591 | |
| 2592 | /* *INDENT-OFF* */ |
| 2593 | VLIB_REGISTER_NODE (tcp4_syn_sent_node) = |
| 2594 | { |
| 2595 | .function = tcp4_syn_sent, |
| 2596 | .name = "tcp4-syn-sent", |
| 2597 | /* Takes a vector of packets. */ |
| 2598 | .vector_size = sizeof (u32), |
| 2599 | .n_errors = TCP_N_ERROR, |
| 2600 | .error_strings = tcp_error_strings, |
| 2601 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2602 | .next_nodes = |
| 2603 | { |
| 2604 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2605 | foreach_tcp_state_next |
| 2606 | #undef _ |
| 2607 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2608 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2609 | }; |
| 2610 | /* *INDENT-ON* */ |
| 2611 | |
| 2612 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_syn_sent_node, tcp4_syn_sent); |
| 2613 | |
| 2614 | /* *INDENT-OFF* */ |
| 2615 | VLIB_REGISTER_NODE (tcp6_syn_sent_node) = |
| 2616 | { |
| 2617 | .function = tcp6_syn_sent_rcv, |
| 2618 | .name = "tcp6-syn-sent", |
| 2619 | /* Takes a vector of packets. */ |
| 2620 | .vector_size = sizeof (u32), |
| 2621 | .n_errors = TCP_N_ERROR, |
| 2622 | .error_strings = tcp_error_strings, |
| 2623 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2624 | .next_nodes = |
| 2625 | { |
| 2626 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2627 | foreach_tcp_state_next |
| 2628 | #undef _ |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2629 | }, |
| 2630 | .format_trace = format_tcp_rx_trace_short, |
| 2631 | }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2632 | /* *INDENT-ON* */ |
| 2633 | |
| 2634 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2635 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2636 | vlib_node_registration_t tcp4_rcv_process_node; |
| 2637 | vlib_node_registration_t tcp6_rcv_process_node; |
| 2638 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2639 | /** |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2640 | * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2641 | * as per RFC793 p. 64 |
| 2642 | */ |
| 2643 | always_inline uword |
| 2644 | tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2645 | vlib_frame_t * from_frame, int is_ip4) |
| 2646 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2647 | u32 thread_index = vm->thread_index, errors = 0, *first_buffer; |
| 2648 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 2649 | u32 n_left_from, *from; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2650 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2651 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2652 | n_left_from = from_frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2653 | |
| 2654 | while (n_left_from > 0) |
| 2655 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2656 | u32 bi0, error0 = TCP_ERROR_NONE; |
| 2657 | tcp_header_t *tcp0 = 0; |
| 2658 | tcp_connection_t *tc0; |
| 2659 | vlib_buffer_t *b0; |
| 2660 | u8 is_fin0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2661 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2662 | bi0 = from[0]; |
| 2663 | from += 1; |
| 2664 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2665 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2666 | b0 = vlib_get_buffer (vm, bi0); |
| 2667 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2668 | thread_index); |
| 2669 | if (PREDICT_FALSE (tc0 == 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2670 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2671 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2672 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2673 | } |
| 2674 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2675 | tcp0 = tcp_buffer_hdr (b0); |
| 2676 | is_fin0 = tcp_is_fin (tcp0); |
| 2677 | |
| 2678 | /* SYNs, FINs and data consume sequence numbers */ |
| 2679 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
| 2680 | + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len; |
| 2681 | |
| 2682 | if (CLIB_DEBUG) |
| 2683 | { |
| 2684 | tcp_connection_t *tmp; |
| 2685 | tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index, |
| 2686 | is_ip4); |
| 2687 | if (tmp->state != tc0->state) |
| 2688 | { |
| 2689 | clib_warning ("state changed"); |
| 2690 | goto drop; |
| 2691 | } |
| 2692 | } |
| 2693 | |
| 2694 | /* |
| 2695 | * Special treatment for CLOSED |
| 2696 | */ |
| 2697 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 2698 | { |
| 2699 | error0 = TCP_ERROR_CONNECTION_CLOSED; |
| 2700 | goto drop; |
| 2701 | } |
| 2702 | |
| 2703 | /* |
| 2704 | * For all other states (except LISTEN) |
| 2705 | */ |
| 2706 | |
| 2707 | /* 1-4: check SEQ, RST, SYN */ |
| 2708 | if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, tcp0, &error0))) |
| 2709 | goto drop; |
| 2710 | |
| 2711 | /* 5: check the ACK field */ |
| 2712 | switch (tc0->state) |
| 2713 | { |
| 2714 | case TCP_STATE_SYN_RCVD: |
| 2715 | /* |
| 2716 | * If the segment acknowledgment is not acceptable, form a |
| 2717 | * reset segment, |
| 2718 | * <SEQ=SEG.ACK><CTL=RST> |
| 2719 | * and send it. |
| 2720 | */ |
| 2721 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
| 2722 | { |
| 2723 | TCP_DBG ("connection not accepted"); |
| 2724 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
| 2725 | error0 = TCP_ERROR_ACK_INVALID; |
| 2726 | goto drop; |
| 2727 | } |
| 2728 | |
Florin Coras | 4850e3e | 2018-12-12 14:34:38 -0800 | [diff] [blame] | 2729 | /* Make sure the ack is exactly right */ |
Florin Coras | 2e7e6ae | 2018-12-12 23:31:33 -0800 | [diff] [blame] | 2730 | if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number || is_fin0) |
Florin Coras | 4850e3e | 2018-12-12 14:34:38 -0800 | [diff] [blame] | 2731 | { |
| 2732 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 2733 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
| 2734 | goto drop; |
| 2735 | } |
| 2736 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2737 | /* Update rtt and rto */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2738 | tcp_estimate_initial_rtt (tc0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2739 | |
| 2740 | /* Switch state to ESTABLISHED */ |
| 2741 | tc0->state = TCP_STATE_ESTABLISHED; |
| 2742 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2743 | |
| 2744 | /* Initialize session variables */ |
| 2745 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
| 2746 | tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
| 2747 | << tc0->rcv_opts.wscale; |
| 2748 | tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 2749 | tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
| 2750 | |
| 2751 | /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ |
| 2752 | tcp_retransmit_timer_reset (tc0); |
| 2753 | tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); |
| 2754 | stream_session_accept_notify (&tc0->connection); |
| 2755 | error0 = TCP_ERROR_ACK_OK; |
| 2756 | break; |
| 2757 | case TCP_STATE_ESTABLISHED: |
| 2758 | /* We can get packets in established state here because they |
| 2759 | * were enqueued before state change */ |
| 2760 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2761 | goto drop; |
| 2762 | |
| 2763 | break; |
| 2764 | case TCP_STATE_FIN_WAIT_1: |
| 2765 | /* In addition to the processing for the ESTABLISHED state, if |
| 2766 | * our FIN is now acknowledged then enter FIN-WAIT-2 and |
| 2767 | * continue processing in that state. */ |
| 2768 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2769 | goto drop; |
| 2770 | |
| 2771 | /* Still have to send the FIN */ |
| 2772 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2773 | { |
| 2774 | /* TX fifo finally drained */ |
| 2775 | if (!session_tx_fifo_max_dequeue (&tc0->connection)) |
| 2776 | tcp_send_fin (tc0); |
| 2777 | } |
| 2778 | /* If FIN is ACKed */ |
| 2779 | else if (tc0->snd_una == tc0->snd_una_max) |
| 2780 | { |
| 2781 | tc0->state = TCP_STATE_FIN_WAIT_2; |
| 2782 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2783 | |
| 2784 | /* Stop all retransmit timers because we have nothing more |
| 2785 | * to send. Enable waitclose though because we're willing to |
| 2786 | * wait for peer's FIN but not indefinitely. */ |
| 2787 | tcp_connection_timers_reset (tc0); |
| 2788 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2789 | |
| 2790 | /* Don't try to deq the FIN acked */ |
| 2791 | if (tc0->burst_acked > 1) |
| 2792 | stream_session_dequeue_drop (&tc0->connection, |
| 2793 | tc0->burst_acked - 1); |
| 2794 | tc0->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2795 | } |
| 2796 | break; |
| 2797 | case TCP_STATE_FIN_WAIT_2: |
| 2798 | /* In addition to the processing for the ESTABLISHED state, if |
| 2799 | * the retransmission queue is empty, the user's CLOSE can be |
| 2800 | * acknowledged ("ok") but do not delete the TCB. */ |
| 2801 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2802 | goto drop; |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 2803 | tc0->burst_acked = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2804 | break; |
| 2805 | case TCP_STATE_CLOSE_WAIT: |
| 2806 | /* Do the same processing as for the ESTABLISHED state. */ |
| 2807 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2808 | goto drop; |
| 2809 | |
| 2810 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2811 | { |
| 2812 | /* TX fifo finally drained */ |
| 2813 | if (!session_tx_fifo_max_dequeue (&tc0->connection)) |
| 2814 | { |
| 2815 | tcp_send_fin (tc0); |
| 2816 | tcp_connection_timers_reset (tc0); |
| 2817 | tc0->state = TCP_STATE_LAST_ACK; |
| 2818 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
| 2819 | } |
| 2820 | } |
| 2821 | break; |
| 2822 | case TCP_STATE_CLOSING: |
| 2823 | /* In addition to the processing for the ESTABLISHED state, if |
| 2824 | * the ACK acknowledges our FIN then enter the TIME-WAIT state, |
| 2825 | * otherwise ignore the segment. */ |
| 2826 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2827 | goto drop; |
| 2828 | |
| 2829 | tc0->state = TCP_STATE_TIME_WAIT; |
| 2830 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2831 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
| 2832 | goto drop; |
| 2833 | |
| 2834 | break; |
| 2835 | case TCP_STATE_LAST_ACK: |
| 2836 | /* The only thing that [should] arrive in this state is an |
| 2837 | * acknowledgment of our FIN. If our FIN is now acknowledged, |
| 2838 | * delete the TCB, enter the CLOSED state, and return. */ |
| 2839 | |
| 2840 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
| 2841 | { |
| 2842 | error0 = TCP_ERROR_ACK_INVALID; |
| 2843 | goto drop; |
| 2844 | } |
| 2845 | error0 = TCP_ERROR_ACK_OK; |
| 2846 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
| 2847 | /* Apparently our ACK for the peer's FIN was lost */ |
| 2848 | if (is_fin0 && tc0->snd_una != tc0->snd_una_max) |
| 2849 | { |
| 2850 | tcp_send_fin (tc0); |
| 2851 | goto drop; |
| 2852 | } |
| 2853 | |
| 2854 | tc0->state = TCP_STATE_CLOSED; |
| 2855 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2856 | |
| 2857 | /* Don't free the connection from the data path since |
| 2858 | * we can't ensure that we have no packets already enqueued |
| 2859 | * to output. Rely instead on the waitclose timer */ |
| 2860 | tcp_connection_timers_reset (tc0); |
| 2861 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, 1); |
| 2862 | |
| 2863 | goto drop; |
| 2864 | |
| 2865 | break; |
| 2866 | case TCP_STATE_TIME_WAIT: |
| 2867 | /* The only thing that can arrive in this state is a |
| 2868 | * retransmission of the remote FIN. Acknowledge it, and restart |
| 2869 | * the 2 MSL timeout. */ |
| 2870 | |
| 2871 | if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0)) |
| 2872 | goto drop; |
| 2873 | |
| 2874 | tcp_program_ack (wrk, tc0); |
| 2875 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
| 2876 | goto drop; |
| 2877 | |
| 2878 | break; |
| 2879 | default: |
| 2880 | ASSERT (0); |
| 2881 | } |
| 2882 | |
| 2883 | /* 6: check the URG bit TODO */ |
| 2884 | |
| 2885 | /* 7: process the segment text */ |
| 2886 | switch (tc0->state) |
| 2887 | { |
| 2888 | case TCP_STATE_ESTABLISHED: |
| 2889 | case TCP_STATE_FIN_WAIT_1: |
| 2890 | case TCP_STATE_FIN_WAIT_2: |
| 2891 | if (vnet_buffer (b0)->tcp.data_len) |
| 2892 | error0 = tcp_segment_rcv (wrk, tc0, b0); |
| 2893 | else if (is_fin0) |
| 2894 | tc0->rcv_nxt += 1; |
| 2895 | break; |
| 2896 | case TCP_STATE_CLOSE_WAIT: |
| 2897 | case TCP_STATE_CLOSING: |
| 2898 | case TCP_STATE_LAST_ACK: |
| 2899 | case TCP_STATE_TIME_WAIT: |
| 2900 | /* This should not occur, since a FIN has been received from the |
| 2901 | * remote side. Ignore the segment text. */ |
| 2902 | break; |
| 2903 | } |
| 2904 | |
| 2905 | /* 8: check the FIN bit */ |
| 2906 | if (!is_fin0) |
| 2907 | goto drop; |
| 2908 | |
| 2909 | switch (tc0->state) |
| 2910 | { |
| 2911 | case TCP_STATE_ESTABLISHED: |
| 2912 | case TCP_STATE_SYN_RCVD: |
| 2913 | /* Send FIN-ACK notify app and enter CLOSE-WAIT */ |
| 2914 | tcp_connection_timers_reset (tc0); |
| 2915 | tcp_send_fin (tc0); |
| 2916 | stream_session_disconnect_notify (&tc0->connection); |
| 2917 | tc0->state = TCP_STATE_CLOSE_WAIT; |
| 2918 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2919 | break; |
| 2920 | case TCP_STATE_CLOSE_WAIT: |
| 2921 | case TCP_STATE_CLOSING: |
| 2922 | case TCP_STATE_LAST_ACK: |
| 2923 | /* move along .. */ |
| 2924 | break; |
| 2925 | case TCP_STATE_FIN_WAIT_1: |
| 2926 | tc0->state = TCP_STATE_CLOSING; |
| 2927 | tcp_program_ack (wrk, tc0); |
| 2928 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2929 | /* Wait for ACK but not forever */ |
| 2930 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
| 2931 | break; |
| 2932 | case TCP_STATE_FIN_WAIT_2: |
| 2933 | /* Got FIN, send ACK! Be more aggressive with resource cleanup */ |
| 2934 | tc0->state = TCP_STATE_TIME_WAIT; |
| 2935 | tcp_connection_timers_reset (tc0); |
| 2936 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
| 2937 | tcp_program_ack (wrk, tc0); |
| 2938 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2939 | break; |
| 2940 | case TCP_STATE_TIME_WAIT: |
| 2941 | /* Remain in the TIME-WAIT state. Restart the time-wait |
| 2942 | * timeout. |
| 2943 | */ |
| 2944 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
| 2945 | break; |
| 2946 | } |
| 2947 | error0 = TCP_ERROR_FIN_RCVD; |
| 2948 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); |
| 2949 | |
| 2950 | drop: |
| 2951 | |
| 2952 | tcp_inc_counter (rcv_process, error0, 1); |
| 2953 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2954 | { |
| 2955 | tcp_rx_trace_t *t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2956 | tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); |
| 2957 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2958 | } |
| 2959 | |
Florin Coras | 3cbc04b | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 2960 | errors = session_manager_flush_enqueue_events (TRANSPORT_PROTO_TCP, |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2961 | thread_index); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 2962 | tcp_inc_counter (rcv_process, TCP_ERROR_EVENT_FIFO_FULL, errors); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2963 | tcp_handle_postponed_dequeues (wrk); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 2964 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
| 2965 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2966 | return from_frame->n_vectors; |
| 2967 | } |
| 2968 | |
| 2969 | static uword |
| 2970 | tcp4_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2971 | vlib_frame_t * from_frame) |
| 2972 | { |
| 2973 | return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2974 | } |
| 2975 | |
| 2976 | static uword |
| 2977 | tcp6_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2978 | vlib_frame_t * from_frame) |
| 2979 | { |
| 2980 | return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2981 | } |
| 2982 | |
| 2983 | /* *INDENT-OFF* */ |
| 2984 | VLIB_REGISTER_NODE (tcp4_rcv_process_node) = |
| 2985 | { |
| 2986 | .function = tcp4_rcv_process, |
| 2987 | .name = "tcp4-rcv-process", |
| 2988 | /* Takes a vector of packets. */ |
| 2989 | .vector_size = sizeof (u32), |
| 2990 | .n_errors = TCP_N_ERROR, |
| 2991 | .error_strings = tcp_error_strings, |
| 2992 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2993 | .next_nodes = |
| 2994 | { |
| 2995 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2996 | foreach_tcp_state_next |
| 2997 | #undef _ |
| 2998 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2999 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3000 | }; |
| 3001 | /* *INDENT-ON* */ |
| 3002 | |
| 3003 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_rcv_process_node, tcp4_rcv_process); |
| 3004 | |
| 3005 | /* *INDENT-OFF* */ |
| 3006 | VLIB_REGISTER_NODE (tcp6_rcv_process_node) = |
| 3007 | { |
| 3008 | .function = tcp6_rcv_process, |
| 3009 | .name = "tcp6-rcv-process", |
| 3010 | /* Takes a vector of packets. */ |
| 3011 | .vector_size = sizeof (u32), |
| 3012 | .n_errors = TCP_N_ERROR, |
| 3013 | .error_strings = tcp_error_strings, |
| 3014 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 3015 | .next_nodes = |
| 3016 | { |
| 3017 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 3018 | foreach_tcp_state_next |
| 3019 | #undef _ |
| 3020 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3021 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3022 | }; |
| 3023 | /* *INDENT-ON* */ |
| 3024 | |
| 3025 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_rcv_process_node, tcp6_rcv_process); |
| 3026 | |
| 3027 | vlib_node_registration_t tcp4_listen_node; |
| 3028 | vlib_node_registration_t tcp6_listen_node; |
| 3029 | |
| 3030 | /** |
| 3031 | * LISTEN state processing as per RFC 793 p. 65 |
| 3032 | */ |
| 3033 | always_inline uword |
| 3034 | tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3035 | vlib_frame_t * from_frame, int is_ip4) |
| 3036 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3037 | u32 n_left_from, *from, n_syns = 0, *first_buffer; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 3038 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3039 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3040 | from = first_buffer = vlib_frame_vector_args (from_frame); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3041 | n_left_from = from_frame->n_vectors; |
| 3042 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3043 | while (n_left_from > 0) |
| 3044 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3045 | u32 bi0; |
| 3046 | vlib_buffer_t *b0; |
| 3047 | tcp_rx_trace_t *t0; |
| 3048 | tcp_header_t *th0 = 0; |
| 3049 | tcp_connection_t *lc0; |
| 3050 | ip4_header_t *ip40; |
| 3051 | ip6_header_t *ip60; |
| 3052 | tcp_connection_t *child0; |
| 3053 | u32 error0 = TCP_ERROR_NONE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3054 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3055 | bi0 = from[0]; |
| 3056 | from += 1; |
| 3057 | n_left_from -= 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3058 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3059 | b0 = vlib_get_buffer (vm, bi0); |
| 3060 | lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); |
| 3061 | |
| 3062 | if (is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3063 | { |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3064 | ip40 = vlib_buffer_get_current (b0); |
| 3065 | th0 = ip4_next_header (ip40); |
| 3066 | } |
| 3067 | else |
| 3068 | { |
| 3069 | ip60 = vlib_buffer_get_current (b0); |
| 3070 | th0 = ip6_next_header (ip60); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3071 | } |
| 3072 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3073 | /* Create child session. For syn-flood protection use filter */ |
| 3074 | |
| 3075 | /* 1. first check for an RST: handled in dispatch */ |
| 3076 | /* if (tcp_rst (th0)) |
| 3077 | goto drop; |
| 3078 | */ |
| 3079 | |
| 3080 | /* 2. second check for an ACK: handled in dispatch */ |
| 3081 | /* if (tcp_ack (th0)) |
| 3082 | { |
| 3083 | tcp_send_reset (b0, is_ip4); |
| 3084 | goto drop; |
| 3085 | } |
| 3086 | */ |
| 3087 | |
| 3088 | /* 3. check for a SYN (did that already) */ |
| 3089 | |
| 3090 | /* Make sure connection wasn't just created */ |
| 3091 | child0 = tcp_lookup_connection (lc0->c_fib_index, b0, my_thread_index, |
| 3092 | is_ip4); |
| 3093 | if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN)) |
| 3094 | { |
| 3095 | error0 = TCP_ERROR_CREATE_EXISTS; |
| 3096 | goto drop; |
| 3097 | } |
| 3098 | |
| 3099 | /* Create child session and send SYN-ACK */ |
Florin Coras | 8124cb7 | 2018-12-16 20:57:29 -0800 | [diff] [blame^] | 3100 | child0 = tcp_connection_alloc (my_thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3101 | child0->c_lcl_port = th0->dst_port; |
| 3102 | child0->c_rmt_port = th0->src_port; |
| 3103 | child0->c_is_ip4 = is_ip4; |
| 3104 | child0->state = TCP_STATE_SYN_RCVD; |
| 3105 | child0->c_fib_index = lc0->c_fib_index; |
| 3106 | |
| 3107 | if (is_ip4) |
| 3108 | { |
| 3109 | child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32; |
| 3110 | child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32; |
| 3111 | } |
| 3112 | else |
| 3113 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 3114 | clib_memcpy_fast (&child0->c_lcl_ip6, &ip60->dst_address, |
| 3115 | sizeof (ip6_address_t)); |
| 3116 | clib_memcpy_fast (&child0->c_rmt_ip6, &ip60->src_address, |
| 3117 | sizeof (ip6_address_t)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3118 | } |
| 3119 | |
Florin Coras | 8023111 | 2018-12-05 15:59:31 -0800 | [diff] [blame] | 3120 | if (tcp_options_parse (th0, &child0->rcv_opts, 1)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3121 | { |
Florin Coras | 8124cb7 | 2018-12-16 20:57:29 -0800 | [diff] [blame^] | 3122 | error0 = TCP_ERROR_OPTIONS; |
| 3123 | tcp_connection_free (child0); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3124 | goto drop; |
| 3125 | } |
| 3126 | |
| 3127 | child0->irs = vnet_buffer (b0)->tcp.seq_number; |
| 3128 | child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1; |
| 3129 | child0->rcv_las = child0->rcv_nxt; |
| 3130 | child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; |
| 3131 | |
| 3132 | /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} |
| 3133 | * segments are used to initialize PAWS. */ |
| 3134 | if (tcp_opts_tstamp (&child0->rcv_opts)) |
| 3135 | { |
| 3136 | child0->tsval_recent = child0->rcv_opts.tsval; |
| 3137 | child0->tsval_recent_age = tcp_time_now (); |
| 3138 | } |
| 3139 | |
| 3140 | if (tcp_opts_wscale (&child0->rcv_opts)) |
| 3141 | child0->snd_wscale = child0->rcv_opts.wscale; |
| 3142 | |
| 3143 | child0->snd_wnd = clib_net_to_host_u16 (th0->window) |
| 3144 | << child0->snd_wscale; |
| 3145 | child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 3146 | child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
| 3147 | |
| 3148 | tcp_connection_init_vars (child0); |
| 3149 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1); |
| 3150 | |
| 3151 | if (stream_session_accept (&child0->connection, lc0->c_s_index, |
| 3152 | 0 /* notify */ )) |
| 3153 | { |
| 3154 | clib_warning ("session accept fail"); |
| 3155 | tcp_connection_cleanup (child0); |
| 3156 | error0 = TCP_ERROR_CREATE_SESSION_FAIL; |
| 3157 | goto drop; |
| 3158 | } |
| 3159 | |
Florin Coras | 2e31cc3 | 2018-09-25 14:00:34 -0700 | [diff] [blame] | 3160 | child0->tx_fifo_size = transport_tx_fifo_size (&child0->connection); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3161 | tcp_send_synack (child0); |
| 3162 | tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME); |
| 3163 | |
| 3164 | drop: |
| 3165 | |
| 3166 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 3167 | { |
| 3168 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 3169 | clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
| 3170 | clib_memcpy_fast (&t0->tcp_connection, lc0, |
| 3171 | sizeof (t0->tcp_connection)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3172 | } |
| 3173 | |
| 3174 | n_syns += (error0 == TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3175 | } |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3176 | |
| 3177 | tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 3178 | vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); |
| 3179 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3180 | return from_frame->n_vectors; |
| 3181 | } |
| 3182 | |
| 3183 | static uword |
| 3184 | tcp4_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3185 | vlib_frame_t * from_frame) |
| 3186 | { |
| 3187 | return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 3188 | } |
| 3189 | |
| 3190 | static uword |
| 3191 | tcp6_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3192 | vlib_frame_t * from_frame) |
| 3193 | { |
| 3194 | return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 3195 | } |
| 3196 | |
| 3197 | /* *INDENT-OFF* */ |
| 3198 | VLIB_REGISTER_NODE (tcp4_listen_node) = |
| 3199 | { |
| 3200 | .function = tcp4_listen, |
| 3201 | .name = "tcp4-listen", |
| 3202 | /* Takes a vector of packets. */ |
| 3203 | .vector_size = sizeof (u32), |
| 3204 | .n_errors = TCP_N_ERROR, |
| 3205 | .error_strings = tcp_error_strings, |
| 3206 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 3207 | .next_nodes = |
| 3208 | { |
| 3209 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 3210 | foreach_tcp_state_next |
| 3211 | #undef _ |
| 3212 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3213 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3214 | }; |
| 3215 | /* *INDENT-ON* */ |
| 3216 | |
| 3217 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_listen_node, tcp4_listen); |
| 3218 | |
| 3219 | /* *INDENT-OFF* */ |
| 3220 | VLIB_REGISTER_NODE (tcp6_listen_node) = |
| 3221 | { |
| 3222 | .function = tcp6_listen, |
| 3223 | .name = "tcp6-listen", |
| 3224 | /* Takes a vector of packets. */ |
| 3225 | .vector_size = sizeof (u32), |
| 3226 | .n_errors = TCP_N_ERROR, |
| 3227 | .error_strings = tcp_error_strings, |
| 3228 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 3229 | .next_nodes = |
| 3230 | { |
| 3231 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 3232 | foreach_tcp_state_next |
| 3233 | #undef _ |
| 3234 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 3235 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3236 | }; |
| 3237 | /* *INDENT-ON* */ |
| 3238 | |
| 3239 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_listen_node, tcp6_listen); |
| 3240 | |
| 3241 | vlib_node_registration_t tcp4_input_node; |
| 3242 | vlib_node_registration_t tcp6_input_node; |
| 3243 | |
| 3244 | typedef enum _tcp_input_next |
| 3245 | { |
| 3246 | TCP_INPUT_NEXT_DROP, |
| 3247 | TCP_INPUT_NEXT_LISTEN, |
| 3248 | TCP_INPUT_NEXT_RCV_PROCESS, |
| 3249 | TCP_INPUT_NEXT_SYN_SENT, |
| 3250 | TCP_INPUT_NEXT_ESTABLISHED, |
| 3251 | TCP_INPUT_NEXT_RESET, |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3252 | TCP_INPUT_NEXT_PUNT, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3253 | TCP_INPUT_N_NEXT |
| 3254 | } tcp_input_next_t; |
| 3255 | |
| 3256 | #define foreach_tcp4_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3257 | _ (DROP, "ip4-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3258 | _ (LISTEN, "tcp4-listen") \ |
| 3259 | _ (RCV_PROCESS, "tcp4-rcv-process") \ |
| 3260 | _ (SYN_SENT, "tcp4-syn-sent") \ |
| 3261 | _ (ESTABLISHED, "tcp4-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3262 | _ (RESET, "tcp4-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3263 | _ (PUNT, "ip4-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3264 | |
| 3265 | #define foreach_tcp6_input_next \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3266 | _ (DROP, "ip6-drop") \ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3267 | _ (LISTEN, "tcp6-listen") \ |
| 3268 | _ (RCV_PROCESS, "tcp6-rcv-process") \ |
| 3269 | _ (SYN_SENT, "tcp6-syn-sent") \ |
| 3270 | _ (ESTABLISHED, "tcp6-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3271 | _ (RESET, "tcp6-reset") \ |
Vijayabhaskar Katamreddy | ce07412 | 2017-11-15 13:50:26 -0800 | [diff] [blame] | 3272 | _ (PUNT, "ip6-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3273 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3274 | #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) |
| 3275 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3276 | static void |
| 3277 | 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] | 3278 | vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4) |
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 | tcp_connection_t *tc; |
| 3281 | tcp_header_t *tcp; |
| 3282 | tcp_rx_trace_t *t; |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3283 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3284 | |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 3285 | for (i = 0; i < n_bufs; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3286 | { |
Florin Coras | 4df3871 | 2018-06-20 12:44:16 -0700 | [diff] [blame] | 3287 | if (bs[i]->flags & VLIB_BUFFER_IS_TRACED) |
| 3288 | { |
| 3289 | t = vlib_add_trace (vm, node, bs[i], sizeof (*t)); |
| 3290 | tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index, |
| 3291 | vm->thread_index); |
| 3292 | tcp = vlib_buffer_get_current (bs[i]); |
| 3293 | tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4); |
| 3294 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3295 | } |
| 3296 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3297 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3298 | static void |
| 3299 | tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4) |
| 3300 | { |
| 3301 | if (*error == TCP_ERROR_FILTERED) |
| 3302 | { |
| 3303 | *next = TCP_INPUT_NEXT_DROP; |
| 3304 | } |
| 3305 | else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6)) |
| 3306 | { |
| 3307 | *next = TCP_INPUT_NEXT_PUNT; |
| 3308 | *error = TCP_ERROR_PUNT; |
| 3309 | } |
| 3310 | else |
| 3311 | { |
| 3312 | *next = TCP_INPUT_NEXT_RESET; |
| 3313 | *error = TCP_ERROR_NO_LISTENER; |
| 3314 | } |
| 3315 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3316 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3317 | static inline tcp_connection_t * |
| 3318 | tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, |
| 3319 | u8 is_ip4) |
| 3320 | { |
| 3321 | u32 fib_index = vnet_buffer (b)->ip.fib_index; |
| 3322 | int n_advance_bytes, n_data_bytes; |
| 3323 | transport_connection_t *tc; |
| 3324 | tcp_header_t *tcp; |
| 3325 | u8 is_filtered = 0; |
| 3326 | |
| 3327 | if (is_ip4) |
| 3328 | { |
| 3329 | ip4_header_t *ip4 = vlib_buffer_get_current (b); |
Florin Coras | b8dda5f | 2018-12-05 10:03:34 -0800 | [diff] [blame] | 3330 | int ip_hdr_bytes = ip4_header_bytes (ip4); |
| 3331 | if (PREDICT_FALSE (b->current_length < ip_hdr_bytes + sizeof (*tcp))) |
| 3332 | { |
| 3333 | *error = TCP_ERROR_LENGTH; |
| 3334 | return 0; |
| 3335 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3336 | tcp = ip4_next_header (ip4); |
| 3337 | vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4; |
Florin Coras | b8dda5f | 2018-12-05 10:03:34 -0800 | [diff] [blame] | 3338 | n_advance_bytes = (ip_hdr_bytes + tcp_header_bytes (tcp)); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3339 | n_data_bytes = clib_net_to_host_u16 (ip4->length) - n_advance_bytes; |
| 3340 | |
| 3341 | /* Length check. Checksum computed by ipx_local no need to compute again */ |
Florin Coras | b8dda5f | 2018-12-05 10:03:34 -0800 | [diff] [blame] | 3342 | if (PREDICT_FALSE (n_data_bytes < 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3343 | { |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3344 | *error = TCP_ERROR_LENGTH; |
| 3345 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3346 | } |
| 3347 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3348 | tc = session_lookup_connection_wt4 (fib_index, &ip4->dst_address, |
| 3349 | &ip4->src_address, tcp->dst_port, |
| 3350 | tcp->src_port, TRANSPORT_PROTO_TCP, |
| 3351 | thread_index, &is_filtered); |
| 3352 | } |
| 3353 | else |
| 3354 | { |
| 3355 | ip6_header_t *ip6 = vlib_buffer_get_current (b); |
Florin Coras | b8dda5f | 2018-12-05 10:03:34 -0800 | [diff] [blame] | 3356 | if (PREDICT_FALSE (b->current_length < sizeof (*ip6) + sizeof (*tcp))) |
| 3357 | { |
| 3358 | *error = TCP_ERROR_LENGTH; |
| 3359 | return 0; |
| 3360 | } |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3361 | tcp = ip6_next_header (ip6); |
| 3362 | vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip6; |
| 3363 | n_advance_bytes = tcp_header_bytes (tcp); |
| 3364 | n_data_bytes = clib_net_to_host_u16 (ip6->payload_length) |
| 3365 | - n_advance_bytes; |
| 3366 | n_advance_bytes += sizeof (ip6[0]); |
| 3367 | |
Florin Coras | b8dda5f | 2018-12-05 10:03:34 -0800 | [diff] [blame] | 3368 | if (PREDICT_FALSE (n_data_bytes < 0)) |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3369 | { |
| 3370 | *error = TCP_ERROR_LENGTH; |
| 3371 | return 0; |
| 3372 | } |
| 3373 | |
| 3374 | tc = session_lookup_connection_wt6 (fib_index, &ip6->dst_address, |
| 3375 | &ip6->src_address, tcp->dst_port, |
| 3376 | tcp->src_port, TRANSPORT_PROTO_TCP, |
| 3377 | thread_index, &is_filtered); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3378 | } |
| 3379 | |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3380 | vnet_buffer (b)->tcp.seq_number = clib_net_to_host_u32 (tcp->seq_number); |
| 3381 | vnet_buffer (b)->tcp.ack_number = clib_net_to_host_u32 (tcp->ack_number); |
| 3382 | vnet_buffer (b)->tcp.data_offset = n_advance_bytes; |
| 3383 | vnet_buffer (b)->tcp.data_len = n_data_bytes; |
| 3384 | vnet_buffer (b)->tcp.flags = 0; |
| 3385 | |
| 3386 | *error = is_filtered ? TCP_ERROR_FILTERED : *error; |
| 3387 | |
| 3388 | return tcp_get_connection_from_transport (tc); |
| 3389 | } |
| 3390 | |
| 3391 | static inline void |
| 3392 | tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc, |
| 3393 | vlib_buffer_t * b, u16 * next, u32 * error) |
| 3394 | { |
| 3395 | tcp_header_t *tcp; |
| 3396 | u8 flags; |
| 3397 | |
| 3398 | tcp = tcp_buffer_hdr (b); |
| 3399 | flags = tcp->flags & filter_flags; |
| 3400 | *next = tm->dispatch_table[tc->state][flags].next; |
| 3401 | *error = tm->dispatch_table[tc->state][flags].error; |
| 3402 | |
| 3403 | if (PREDICT_FALSE (*error == TCP_ERROR_DISPATCH |
| 3404 | || *next == TCP_INPUT_NEXT_RESET)) |
| 3405 | { |
| 3406 | /* Overload tcp flags to store state */ |
| 3407 | tcp_state_t state = tc->state; |
| 3408 | vnet_buffer (b)->tcp.flags = tc->state; |
| 3409 | |
| 3410 | if (*error == TCP_ERROR_DISPATCH) |
| 3411 | clib_warning ("disp error state %U flags %U", format_tcp_state, |
| 3412 | state, format_tcp_flags, (int) flags); |
| 3413 | } |
| 3414 | } |
| 3415 | |
| 3416 | always_inline uword |
| 3417 | tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3418 | vlib_frame_t * frame, int is_ip4) |
| 3419 | { |
| 3420 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 3421 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3422 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 3423 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 3424 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 3425 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 0c8a3bc | 2018-06-14 17:11:56 -0700 | [diff] [blame] | 3426 | |
| 3427 | from = vlib_frame_vector_args (frame); |
| 3428 | n_left_from = frame->n_vectors; |
| 3429 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 3430 | |
| 3431 | b = bufs; |
| 3432 | next = nexts; |
| 3433 | |
| 3434 | while (n_left_from >= 4) |
| 3435 | { |
| 3436 | u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER; |
| 3437 | tcp_connection_t *tc0, *tc1; |
| 3438 | |
| 3439 | { |
| 3440 | vlib_prefetch_buffer_header (b[2], STORE); |
| 3441 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3442 | |
| 3443 | vlib_prefetch_buffer_header (b[3], STORE); |
| 3444 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3445 | } |
| 3446 | |
| 3447 | next[0] = next[1] = TCP_INPUT_NEXT_DROP; |
| 3448 | |
| 3449 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); |
| 3450 | tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4); |
| 3451 | |
| 3452 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 3453 | { |
| 3454 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3455 | ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); |
| 3456 | |
| 3457 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3458 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 3459 | |
| 3460 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3461 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); |
| 3462 | } |
| 3463 | else |
| 3464 | { |
| 3465 | if (PREDICT_TRUE (tc0 != 0)) |
| 3466 | { |
| 3467 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3468 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3469 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3470 | } |
| 3471 | else |
| 3472 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
| 3473 | |
| 3474 | if (PREDICT_TRUE (tc1 != 0)) |
| 3475 | { |
| 3476 | ASSERT (tcp_lookup_is_valid (tc1, tcp_buffer_hdr (b[1]))); |
| 3477 | vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index; |
| 3478 | tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], &error1); |
| 3479 | } |
| 3480 | else |
| 3481 | tcp_input_set_error_next (tm, &next[1], &error1, is_ip4); |
| 3482 | } |
| 3483 | |
| 3484 | b += 2; |
| 3485 | next += 2; |
| 3486 | n_left_from -= 2; |
| 3487 | } |
| 3488 | while (n_left_from > 0) |
| 3489 | { |
| 3490 | tcp_connection_t *tc0; |
| 3491 | u32 error0 = TCP_ERROR_NO_LISTENER; |
| 3492 | |
| 3493 | if (n_left_from > 1) |
| 3494 | { |
| 3495 | vlib_prefetch_buffer_header (b[1], STORE); |
| 3496 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); |
| 3497 | } |
| 3498 | |
| 3499 | next[0] = TCP_INPUT_NEXT_DROP; |
| 3500 | tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4); |
| 3501 | if (PREDICT_TRUE (tc0 != 0)) |
| 3502 | { |
| 3503 | ASSERT (tcp_lookup_is_valid (tc0, tcp_buffer_hdr (b[0]))); |
| 3504 | vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index; |
| 3505 | tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], &error0); |
| 3506 | } |
| 3507 | else |
| 3508 | tcp_input_set_error_next (tm, &next[0], &error0, is_ip4); |
| 3509 | |
| 3510 | b += 1; |
| 3511 | next += 1; |
| 3512 | n_left_from -= 1; |
| 3513 | } |
| 3514 | |
| 3515 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 3516 | tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4); |
| 3517 | |
| 3518 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 3519 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3520 | } |
| 3521 | |
| 3522 | static uword |
| 3523 | tcp4_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3524 | vlib_frame_t * from_frame) |
| 3525 | { |
| 3526 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 3527 | } |
| 3528 | |
| 3529 | static uword |
| 3530 | tcp6_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3531 | vlib_frame_t * from_frame) |
| 3532 | { |
| 3533 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 3534 | } |
| 3535 | |
| 3536 | /* *INDENT-OFF* */ |
| 3537 | VLIB_REGISTER_NODE (tcp4_input_node) = |
| 3538 | { |
| 3539 | .function = tcp4_input, |
| 3540 | .name = "tcp4-input", |
| 3541 | /* Takes a vector of packets. */ |
| 3542 | .vector_size = sizeof (u32), |
| 3543 | .n_errors = TCP_N_ERROR, |
| 3544 | .error_strings = tcp_error_strings, |
| 3545 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3546 | .next_nodes = |
| 3547 | { |
| 3548 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3549 | foreach_tcp4_input_next |
| 3550 | #undef _ |
| 3551 | }, |
| 3552 | .format_buffer = format_tcp_header, |
| 3553 | .format_trace = format_tcp_rx_trace, |
| 3554 | }; |
| 3555 | /* *INDENT-ON* */ |
| 3556 | |
| 3557 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_input_node, tcp4_input); |
| 3558 | |
| 3559 | /* *INDENT-OFF* */ |
| 3560 | VLIB_REGISTER_NODE (tcp6_input_node) = |
| 3561 | { |
| 3562 | .function = tcp6_input, |
| 3563 | .name = "tcp6-input", |
| 3564 | /* Takes a vector of packets. */ |
| 3565 | .vector_size = sizeof (u32), |
| 3566 | .n_errors = TCP_N_ERROR, |
| 3567 | .error_strings = tcp_error_strings, |
| 3568 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3569 | .next_nodes = |
| 3570 | { |
| 3571 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3572 | foreach_tcp6_input_next |
| 3573 | #undef _ |
| 3574 | }, |
| 3575 | .format_buffer = format_tcp_header, |
| 3576 | .format_trace = format_tcp_rx_trace, |
| 3577 | }; |
| 3578 | /* *INDENT-ON* */ |
| 3579 | |
| 3580 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3581 | |
| 3582 | static void |
| 3583 | tcp_dispatch_table_init (tcp_main_t * tm) |
| 3584 | { |
| 3585 | int i, j; |
| 3586 | for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++) |
| 3587 | for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++) |
| 3588 | { |
| 3589 | tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP; |
| 3590 | tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH; |
| 3591 | } |
| 3592 | |
| 3593 | #define _(t,f,n,e) \ |
| 3594 | do { \ |
| 3595 | tm->dispatch_table[TCP_STATE_##t][f].next = (n); \ |
| 3596 | tm->dispatch_table[TCP_STATE_##t][f].error = (e); \ |
| 3597 | } while (0) |
| 3598 | |
| 3599 | /* SYNs for new connections -> tcp-listen. */ |
| 3600 | _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3601 | _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); |
Florin Coras | 00cd22d | 2018-04-18 13:20:18 -0700 | [diff] [blame] | 3602 | _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_RST_RCVD); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3603 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
| 3604 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3605 | /* ACK for for a SYN-ACK -> tcp-rcv-process. */ |
| 3606 | _(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] | 3607 | _(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] | 3608 | _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3609 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3610 | _(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] | 3611 | _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3612 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3613 | /* SYN-ACK for a SYN */ |
| 3614 | _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3615 | TCP_ERROR_NONE); |
| 3616 | _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3617 | _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3618 | _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3619 | TCP_ERROR_NONE); |
| 3620 | /* ACK for for established connection -> tcp-established. */ |
| 3621 | _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3622 | /* FIN for for established connection -> tcp-established. */ |
| 3623 | _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3624 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3625 | TCP_ERROR_NONE); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 3626 | _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3627 | _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3628 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3629 | _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3630 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3631 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3632 | /* ACK or FIN-ACK to our FIN */ |
| 3633 | _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3634 | _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3635 | TCP_ERROR_NONE); |
| 3636 | /* FIN in reply to our FIN from the other side */ |
| 3637 | _(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] | 3638 | _(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] | 3639 | _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3640 | /* FIN confirming that the peer (app) has closed */ |
| 3641 | _(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] | 3642 | _(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] | 3643 | _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3644 | TCP_ERROR_NONE); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3645 | _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3646 | _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3647 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3648 | _(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] | 3649 | _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3650 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3651 | TCP_ERROR_NONE); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3652 | _(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] | 3653 | _(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] | 3654 | _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3655 | _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3656 | TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3657 | _(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] | 3658 | _(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] | 3659 | _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3660 | _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 3661 | _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3662 | TCP_ERROR_CONNECTION_CLOSED); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3663 | #undef _ |
| 3664 | } |
| 3665 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 3666 | static clib_error_t * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3667 | tcp_input_init (vlib_main_t * vm) |
| 3668 | { |
| 3669 | clib_error_t *error = 0; |
| 3670 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3671 | |
| 3672 | if ((error = vlib_call_init_function (vm, tcp_init))) |
| 3673 | return error; |
| 3674 | |
| 3675 | /* Initialize dispatch table. */ |
| 3676 | tcp_dispatch_table_init (tm); |
| 3677 | |
| 3678 | return error; |
| 3679 | } |
| 3680 | |
| 3681 | VLIB_INIT_FUNCTION (tcp_input_init); |
| 3682 | |
| 3683 | /* |
| 3684 | * fd.io coding-style-patch-verification: ON |
| 3685 | * |
| 3686 | * Local Variables: |
| 3687 | * eval: (c-set-style "gnu") |
| 3688 | * End: |
| 3689 | */ |