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 \ |
| 30 | _ (DROP, "error-drop") \ |
| 31 | _ (TCP4_OUTPUT, "tcp4-output") \ |
| 32 | _ (TCP6_OUTPUT, "tcp6-output") |
| 33 | |
| 34 | typedef enum _tcp_established_next |
| 35 | { |
| 36 | #define _(s,n) TCP_ESTABLISHED_NEXT_##s, |
| 37 | foreach_tcp_state_next |
| 38 | #undef _ |
| 39 | TCP_ESTABLISHED_N_NEXT, |
| 40 | } tcp_established_next_t; |
| 41 | |
| 42 | typedef enum _tcp_rcv_process_next |
| 43 | { |
| 44 | #define _(s,n) TCP_RCV_PROCESS_NEXT_##s, |
| 45 | foreach_tcp_state_next |
| 46 | #undef _ |
| 47 | TCP_RCV_PROCESS_N_NEXT, |
| 48 | } tcp_rcv_process_next_t; |
| 49 | |
| 50 | typedef enum _tcp_syn_sent_next |
| 51 | { |
| 52 | #define _(s,n) TCP_SYN_SENT_NEXT_##s, |
| 53 | foreach_tcp_state_next |
| 54 | #undef _ |
| 55 | TCP_SYN_SENT_N_NEXT, |
| 56 | } tcp_syn_sent_next_t; |
| 57 | |
| 58 | typedef enum _tcp_listen_next |
| 59 | { |
| 60 | #define _(s,n) TCP_LISTEN_NEXT_##s, |
| 61 | foreach_tcp_state_next |
| 62 | #undef _ |
| 63 | TCP_LISTEN_N_NEXT, |
| 64 | } tcp_listen_next_t; |
| 65 | |
| 66 | /* Generic, state independent indices */ |
| 67 | typedef enum _tcp_state_next |
| 68 | { |
| 69 | #define _(s,n) TCP_NEXT_##s, |
| 70 | foreach_tcp_state_next |
| 71 | #undef _ |
| 72 | TCP_STATE_N_NEXT, |
| 73 | } tcp_state_next_t; |
| 74 | |
| 75 | #define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \ |
| 76 | : TCP_NEXT_TCP6_OUTPUT) |
| 77 | |
| 78 | vlib_node_registration_t tcp4_established_node; |
| 79 | vlib_node_registration_t tcp6_established_node; |
| 80 | |
| 81 | /** |
| 82 | * Validate segment sequence number. As per RFC793: |
| 83 | * |
| 84 | * Segment Receive Test |
| 85 | * Length Window |
| 86 | * ------- ------- ------------------------------------------- |
| 87 | * 0 0 SEG.SEQ = RCV.NXT |
| 88 | * 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 89 | * >0 0 not acceptable |
| 90 | * >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND |
| 91 | * or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND |
| 92 | * |
| 93 | * This ultimately consists in checking if segment falls within the window. |
| 94 | * The one important difference compared to RFC793 is that we use rcv_las, |
| 95 | * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the |
| 96 | * peer's reference when computing our receive window. |
| 97 | * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 98 | * This: |
| 99 | * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las) |
| 100 | * however, is too strict when we have retransmits. Instead we just check that |
| 101 | * the seq is not beyond the right edge and that the end of the segment is not |
| 102 | * less than the left edge. |
| 103 | * |
| 104 | * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so |
| 105 | * use rcv_nxt in the right edge window test instead of rcv_las. |
| 106 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 107 | */ |
| 108 | always_inline u8 |
| 109 | tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq) |
| 110 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 111 | return (seq_geq (end_seq, tc->rcv_las) |
| 112 | && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 113 | } |
| 114 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 115 | /** |
| 116 | * Parse TCP header options. |
| 117 | * |
| 118 | * @param th TCP header |
| 119 | * @param to TCP options data structure to be populated |
| 120 | * @return -1 if parsing failed |
| 121 | */ |
| 122 | int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 123 | tcp_options_parse (tcp_header_t * th, tcp_options_t * to) |
| 124 | { |
| 125 | const u8 *data; |
| 126 | u8 opt_len, opts_len, kind; |
| 127 | int j; |
| 128 | sack_block_t b; |
| 129 | |
| 130 | opts_len = (tcp_doff (th) << 2) - sizeof (tcp_header_t); |
| 131 | data = (const u8 *) (th + 1); |
| 132 | |
| 133 | /* Zero out all flags but those set in SYN */ |
| 134 | to->flags &= (TCP_OPTS_FLAG_SACK_PERMITTED | TCP_OPTS_FLAG_WSCALE); |
| 135 | |
| 136 | for (; opts_len > 0; opts_len -= opt_len, data += opt_len) |
| 137 | { |
| 138 | kind = data[0]; |
| 139 | |
| 140 | /* Get options length */ |
| 141 | if (kind == TCP_OPTION_EOL) |
| 142 | break; |
| 143 | else if (kind == TCP_OPTION_NOOP) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 144 | { |
| 145 | opt_len = 1; |
| 146 | continue; |
| 147 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 148 | else |
| 149 | { |
| 150 | /* broken options */ |
| 151 | if (opts_len < 2) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 152 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 153 | opt_len = data[1]; |
| 154 | |
| 155 | /* weird option length */ |
| 156 | if (opt_len < 2 || opt_len > opts_len) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 157 | return -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | /* Parse options */ |
| 161 | switch (kind) |
| 162 | { |
| 163 | case TCP_OPTION_MSS: |
| 164 | if ((opt_len == TCP_OPTION_LEN_MSS) && tcp_syn (th)) |
| 165 | { |
| 166 | to->flags |= TCP_OPTS_FLAG_MSS; |
| 167 | to->mss = clib_net_to_host_u16 (*(u16 *) (data + 2)); |
| 168 | } |
| 169 | break; |
| 170 | case TCP_OPTION_WINDOW_SCALE: |
| 171 | if ((opt_len == TCP_OPTION_LEN_WINDOW_SCALE) && tcp_syn (th)) |
| 172 | { |
| 173 | to->flags |= TCP_OPTS_FLAG_WSCALE; |
| 174 | to->wscale = data[2]; |
| 175 | if (to->wscale > TCP_MAX_WND_SCALE) |
| 176 | { |
| 177 | clib_warning ("Illegal window scaling value: %d", |
| 178 | to->wscale); |
| 179 | to->wscale = TCP_MAX_WND_SCALE; |
| 180 | } |
| 181 | } |
| 182 | break; |
| 183 | case TCP_OPTION_TIMESTAMP: |
| 184 | if (opt_len == TCP_OPTION_LEN_TIMESTAMP) |
| 185 | { |
| 186 | to->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 187 | to->tsval = clib_net_to_host_u32 (*(u32 *) (data + 2)); |
| 188 | to->tsecr = clib_net_to_host_u32 (*(u32 *) (data + 6)); |
| 189 | } |
| 190 | break; |
| 191 | case TCP_OPTION_SACK_PERMITTED: |
| 192 | if (opt_len == TCP_OPTION_LEN_SACK_PERMITTED && tcp_syn (th)) |
| 193 | to->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 194 | break; |
| 195 | case TCP_OPTION_SACK_BLOCK: |
| 196 | /* If SACK permitted was not advertised or a SYN, break */ |
| 197 | if ((to->flags & TCP_OPTS_FLAG_SACK_PERMITTED) == 0 || tcp_syn (th)) |
| 198 | break; |
| 199 | |
| 200 | /* If too short or not correctly formatted, break */ |
| 201 | if (opt_len < 10 || ((opt_len - 2) % TCP_OPTION_LEN_SACK_BLOCK)) |
| 202 | break; |
| 203 | |
| 204 | to->flags |= TCP_OPTS_FLAG_SACK; |
| 205 | to->n_sack_blocks = (opt_len - 2) / TCP_OPTION_LEN_SACK_BLOCK; |
| 206 | vec_reset_length (to->sacks); |
| 207 | for (j = 0; j < to->n_sack_blocks; j++) |
| 208 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 209 | b.start = clib_net_to_host_u32 (*(u32 *) (data + 2 + 8 * j)); |
| 210 | b.end = clib_net_to_host_u32 (*(u32 *) (data + 6 + 8 * j)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 211 | vec_add1 (to->sacks, b); |
| 212 | } |
| 213 | break; |
| 214 | default: |
| 215 | /* Nothing to see here */ |
| 216 | continue; |
| 217 | } |
| 218 | } |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 219 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 220 | } |
| 221 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 222 | /** |
| 223 | * RFC1323: Check against wrapped sequence numbers (PAWS). If we have |
| 224 | * timestamp to echo and it's less than tsval_recent, drop segment |
| 225 | * but still send an ACK in order to retain TCP's mechanism for detecting |
| 226 | * and recovering from half-open connections |
| 227 | * |
| 228 | * Or at least that's what the theory says. It seems that this might not work |
| 229 | * very well with packet reordering and fast retransmit. XXX |
| 230 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 231 | always_inline int |
| 232 | tcp_segment_check_paws (tcp_connection_t * tc) |
| 233 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 234 | return tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent |
| 235 | && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | /** |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 239 | * Update tsval recent |
| 240 | */ |
| 241 | always_inline void |
| 242 | tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) |
| 243 | { |
| 244 | /* |
| 245 | * RFC1323: If Last.ACK.sent falls within the range of sequence numbers |
| 246 | * of an incoming segment: |
| 247 | * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN |
| 248 | * then the TSval from the segment is copied to TS.Recent; |
| 249 | * otherwise, the TSval is ignored. |
| 250 | */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 251 | if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las) |
| 252 | && seq_leq (tc->rcv_las, seq_end)) |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 253 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 254 | ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 255 | tc->tsval_recent = tc->rcv_opts.tsval; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 256 | tc->tsval_recent_age = tcp_time_now (); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 261 | * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 |
| 262 | * |
| 263 | * It first verifies if segment has a wrapped sequence number (PAWS) and then |
| 264 | * does the processing associated to the first four steps (ignoring security |
| 265 | * and precedence): sequence number, rst bit and syn bit checks. |
| 266 | * |
| 267 | * @return 0 if segments passes validation. |
| 268 | */ |
| 269 | static int |
| 270 | tcp_segment_validate (vlib_main_t * vm, tcp_connection_t * tc0, |
| 271 | vlib_buffer_t * b0, tcp_header_t * th0, u32 * next0) |
| 272 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 273 | if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0))) |
| 274 | return -1; |
| 275 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 276 | if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts))) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 277 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 278 | clib_warning ("options parse error"); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 279 | return -1; |
| 280 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 281 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 282 | if (tcp_segment_check_paws (tc0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 283 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 284 | if (CLIB_DEBUG > 2) |
| 285 | { |
| 286 | clib_warning ("paws failed\n%U", format_tcp_connection, tc0, 2); |
| 287 | clib_warning ("seq %u seq_end %u ack %u", |
| 288 | vnet_buffer (b0)->tcp.seq_number - tc0->irs, |
| 289 | vnet_buffer (b0)->tcp.seq_end - tc0->irs, |
| 290 | vnet_buffer (b0)->tcp.ack_number - tc0->iss); |
| 291 | } |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 292 | TCP_EVT_DBG (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number, |
| 293 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 294 | |
| 295 | /* If it just so happens that a segment updates tsval_recent for a |
| 296 | * segment over 24 days old, invalidate tsval_recent. */ |
| 297 | if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE, |
| 298 | tcp_time_now ())) |
| 299 | { |
| 300 | /* Age isn't reset until we get a valid tsval (bsd inspired) */ |
| 301 | tc0->tsval_recent = 0; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 302 | clib_warning ("paws failed - really old segment. REALLY?"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 303 | } |
| 304 | else |
| 305 | { |
| 306 | /* Drop after ack if not rst */ |
| 307 | if (!tcp_rst (th0)) |
| 308 | { |
| 309 | tcp_make_ack (tc0, b0); |
| 310 | *next0 = tcp_next_output (tc0->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 311 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 312 | return -1; |
| 313 | } |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | /* 1st: check sequence number */ |
| 318 | if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 319 | vnet_buffer (b0)->tcp.seq_end)) |
| 320 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 321 | /* If our window is 0 and the packet is in sequence, let it pass |
| 322 | * through for ack processing. It should be dropped later.*/ |
| 323 | if (tc0->rcv_wnd == 0 |
| 324 | && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 325 | { |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 326 | /* TODO Should segment be tagged? */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 327 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 328 | else |
| 329 | { |
| 330 | /* If not RST, send dup ack */ |
| 331 | if (!tcp_rst (th0)) |
| 332 | { |
| 333 | tcp_make_ack (tc0, b0); |
| 334 | *next0 = tcp_next_output (tc0->c_is_ip4); |
| 335 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc0); |
| 336 | } |
| 337 | return -1; |
| 338 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | /* 2nd: check the RST bit */ |
| 342 | if (tcp_rst (th0)) |
| 343 | { |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 344 | tcp_connection_reset (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 345 | return -1; |
| 346 | } |
| 347 | |
| 348 | /* 3rd: check security and precedence (skip) */ |
| 349 | |
| 350 | /* 4th: check the SYN bit */ |
| 351 | if (tcp_syn (th0)) |
| 352 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 353 | /* TODO implement RFC 5961 */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 354 | if (tc0->state == TCP_STATE_SYN_RCVD) |
| 355 | { |
| 356 | tcp_make_synack (tc0, b0); |
| 357 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0); |
| 358 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 359 | else |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 360 | { |
| 361 | tcp_make_ack (tc0, b0); |
| 362 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0); |
| 363 | } |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 364 | *next0 = tcp_next_output (tc0->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 365 | return -1; |
| 366 | } |
| 367 | |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 368 | /* If segment in window, save timestamp */ |
| 369 | tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number, |
| 370 | vnet_buffer (b0)->tcp.seq_end); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | always_inline int |
| 375 | tcp_rcv_ack_is_acceptable (tcp_connection_t * tc0, vlib_buffer_t * tb0) |
| 376 | { |
| 377 | /* SND.UNA =< SEG.ACK =< SND.NXT */ |
| 378 | return (seq_leq (tc0->snd_una, vnet_buffer (tb0)->tcp.ack_number) |
| 379 | && seq_leq (vnet_buffer (tb0)->tcp.ack_number, tc0->snd_nxt)); |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298 |
| 384 | * |
| 385 | * Note that although the original article, srtt and rttvar are scaled |
| 386 | * to minimize round-off errors, here we don't. Instead, we rely on |
| 387 | * better precision time measurements. |
| 388 | * |
| 389 | * TODO support us rtt resolution |
| 390 | */ |
| 391 | static void |
| 392 | tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt) |
| 393 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 394 | int err, diff; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 395 | |
| 396 | if (tc->srtt != 0) |
| 397 | { |
| 398 | err = mrtt - tc->srtt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 399 | |
| 400 | /* XXX Drop in RTT results in RTTVAR increase and bigger RTO. |
| 401 | * The increase should be bound */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 402 | tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1); |
| 403 | diff = (clib_abs (err) - (int) tc->rttvar) >> 2; |
| 404 | tc->rttvar = clib_max ((int) tc->rttvar + diff, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 405 | } |
| 406 | else |
| 407 | { |
| 408 | /* First measurement. */ |
| 409 | tc->srtt = mrtt; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 410 | tc->rttvar = mrtt >> 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 411 | } |
| 412 | } |
| 413 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 414 | void |
| 415 | tcp_update_rto (tcp_connection_t * tc) |
| 416 | { |
| 417 | tc->rto = clib_min (tc->srtt + (tc->rttvar << 2), TCP_RTO_MAX); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 418 | tc->rto = clib_max (tc->rto, TCP_RTO_MIN); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 419 | } |
| 420 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 421 | /** |
| 422 | * Update RTT estimate and RTO timer |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 423 | * |
| 424 | * Measure RTT: We have two sources of RTT measurements: TSOPT and ACK |
| 425 | * timing. Middle boxes are known to fiddle with TCP options so we |
| 426 | * should give higher priority to ACK timing. |
| 427 | * |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 428 | * This should be called only if previously sent bytes have been acked. |
| 429 | * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 430 | * return 1 if valid rtt 0 otherwise |
| 431 | */ |
| 432 | static int |
| 433 | tcp_update_rtt (tcp_connection_t * tc, u32 ack) |
| 434 | { |
| 435 | u32 mrtt = 0; |
| 436 | |
| 437 | /* Karn's rule, part 1. Don't use retransmitted segments to estimate |
| 438 | * RTT because they're ambiguous. */ |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 439 | if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes) |
| 440 | goto done; |
| 441 | |
| 442 | if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 443 | { |
| 444 | mrtt = tcp_time_now () - tc->rtt_ts; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 445 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 446 | /* As per RFC7323 TSecr can be used for RTTM only if the segment advances |
| 447 | * snd_una, i.e., the left side of the send window: |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 448 | * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */ |
| 449 | else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 450 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 451 | mrtt = tcp_time_now () - tc->rcv_opts.tsecr; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 452 | } |
| 453 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 454 | /* Ignore dubious measurements */ |
| 455 | if (mrtt == 0 || mrtt > TCP_RTT_MAX) |
| 456 | goto done; |
| 457 | |
| 458 | tcp_estimate_rtt (tc, mrtt); |
| 459 | |
| 460 | done: |
| 461 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 462 | /* Allow measuring of a new RTT */ |
| 463 | tc->rtt_ts = 0; |
| 464 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 465 | /* If we got here something must've been ACKed so make sure boff is 0, |
| 466 | * even if mrrt is not valid since we update the rto lower */ |
| 467 | tc->rto_boff = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 468 | tcp_update_rto (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 469 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 470 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | /** |
| 474 | * Dequeue bytes that have been acked and while at it update RTT estimates. |
| 475 | */ |
| 476 | static void |
| 477 | tcp_dequeue_acked (tcp_connection_t * tc, u32 ack) |
| 478 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 479 | /* Dequeue the newly ACKed add SACKed bytes */ |
| 480 | stream_session_dequeue_drop (&tc->connection, |
| 481 | tc->bytes_acked + tc->sack_sb.snd_una_adv); |
| 482 | |
| 483 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 484 | |
| 485 | /* Update rtt and rto */ |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 486 | tcp_update_rtt (tc, ack); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 487 | |
| 488 | /* If everything has been acked, stop retransmit timer |
| 489 | * otherwise update. */ |
| 490 | tcp_retransmit_timer_update (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 491 | } |
| 492 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 493 | /** |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 494 | * Check if duplicate ack as per RFC5681 Sec. 2 |
| 495 | */ |
| 496 | static u8 |
| 497 | tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd, |
| 498 | u32 prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 499 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 500 | return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 501 | && seq_gt (tc->snd_una_max, tc->snd_una) |
| 502 | && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 503 | && (prev_snd_wnd == tc->snd_wnd)); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * Checks if ack is a congestion control event. |
| 508 | */ |
| 509 | static u8 |
| 510 | tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b, |
| 511 | u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack) |
| 512 | { |
| 513 | /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are |
| 514 | * defined to be 'duplicate' */ |
| 515 | *is_dack = tc->sack_sb.last_sacked_bytes |
| 516 | || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una); |
| 517 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 518 | 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] | 519 | } |
| 520 | |
| 521 | void |
| 522 | scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) |
| 523 | { |
| 524 | sack_scoreboard_hole_t *next, *prev; |
| 525 | |
| 526 | if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) |
| 527 | { |
| 528 | next = pool_elt_at_index (sb->holes, hole->next); |
| 529 | next->prev = hole->prev; |
| 530 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 531 | else |
| 532 | { |
| 533 | sb->tail = hole->prev; |
| 534 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 535 | |
| 536 | if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) |
| 537 | { |
| 538 | prev = pool_elt_at_index (sb->holes, hole->prev); |
| 539 | prev->next = hole->next; |
| 540 | } |
| 541 | else |
| 542 | { |
| 543 | sb->head = hole->next; |
| 544 | } |
| 545 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 546 | if (scoreboard_hole_index (sb, hole) == sb->cur_rxt_hole) |
| 547 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 548 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 549 | /* Poison the entry */ |
| 550 | if (CLIB_DEBUG > 0) |
| 551 | memset (hole, 0xfe, sizeof (*hole)); |
| 552 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 553 | pool_put (sb->holes, hole); |
| 554 | } |
| 555 | |
| 556 | sack_scoreboard_hole_t * |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 557 | scoreboard_insert_hole (sack_scoreboard_t * sb, u32 prev_index, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | u32 start, u32 end) |
| 559 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 560 | sack_scoreboard_hole_t *hole, *next, *prev; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 561 | u32 hole_index; |
| 562 | |
| 563 | pool_get (sb->holes, hole); |
| 564 | memset (hole, 0, sizeof (*hole)); |
| 565 | |
| 566 | hole->start = start; |
| 567 | hole->end = end; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 568 | hole_index = scoreboard_hole_index (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 569 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 570 | prev = scoreboard_get_hole (sb, prev_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 571 | if (prev) |
| 572 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 573 | hole->prev = prev_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 574 | hole->next = prev->next; |
| 575 | |
| 576 | if ((next = scoreboard_next_hole (sb, hole))) |
| 577 | next->prev = hole_index; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 578 | else |
| 579 | sb->tail = hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 580 | |
| 581 | prev->next = hole_index; |
| 582 | } |
| 583 | else |
| 584 | { |
| 585 | sb->head = hole_index; |
| 586 | hole->prev = TCP_INVALID_SACK_HOLE_INDEX; |
| 587 | hole->next = TCP_INVALID_SACK_HOLE_INDEX; |
| 588 | } |
| 589 | |
| 590 | return hole; |
| 591 | } |
| 592 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 593 | void |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 594 | scoreboard_update_bytes (tcp_connection_t * tc, sack_scoreboard_t * sb) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 595 | { |
| 596 | sack_scoreboard_hole_t *hole, *prev; |
| 597 | u32 bytes = 0, blks = 0; |
| 598 | |
| 599 | sb->lost_bytes = 0; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 600 | sb->sacked_bytes = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 601 | hole = scoreboard_last_hole (sb); |
| 602 | if (!hole) |
| 603 | return; |
| 604 | |
| 605 | if (seq_gt (sb->high_sacked, hole->end)) |
| 606 | { |
| 607 | bytes = sb->high_sacked - hole->end; |
| 608 | blks = 1; |
| 609 | } |
| 610 | |
| 611 | while ((prev = scoreboard_prev_hole (sb, hole)) |
| 612 | && (bytes < (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss |
| 613 | && blks < TCP_DUPACK_THRESHOLD)) |
| 614 | { |
| 615 | bytes += hole->start - prev->end; |
| 616 | blks++; |
| 617 | hole = prev; |
| 618 | } |
| 619 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 620 | while (hole) |
| 621 | { |
| 622 | sb->lost_bytes += scoreboard_hole_bytes (hole); |
| 623 | hole->is_lost = 1; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 624 | prev = hole; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 625 | hole = scoreboard_prev_hole (sb, hole); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 626 | if (hole) |
| 627 | bytes += prev->start - hole->end; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 628 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 629 | sb->sacked_bytes = bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /** |
| 633 | * Figure out the next hole to retransmit |
| 634 | * |
| 635 | * Follows logic proposed in RFC6675 Sec. 4, NextSeg() |
| 636 | */ |
| 637 | sack_scoreboard_hole_t * |
| 638 | scoreboard_next_rxt_hole (sack_scoreboard_t * sb, |
| 639 | sack_scoreboard_hole_t * start, |
| 640 | u8 have_sent_1_smss, |
| 641 | u8 * can_rescue, u8 * snd_limited) |
| 642 | { |
| 643 | sack_scoreboard_hole_t *hole = 0; |
| 644 | |
| 645 | hole = start ? start : scoreboard_first_hole (sb); |
| 646 | while (hole && seq_leq (hole->end, sb->high_rxt) && hole->is_lost) |
| 647 | hole = scoreboard_next_hole (sb, hole); |
| 648 | |
| 649 | /* Nothing, return */ |
| 650 | if (!hole) |
| 651 | { |
| 652 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /* Rule (1): if higher than rxt, less than high_sacked and lost */ |
| 657 | if (hole->is_lost && seq_lt (hole->start, sb->high_sacked)) |
| 658 | { |
| 659 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 660 | } |
| 661 | else |
| 662 | { |
| 663 | /* Rule (2): output takes care of transmitting new data */ |
| 664 | if (!have_sent_1_smss) |
| 665 | { |
| 666 | hole = 0; |
| 667 | sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; |
| 668 | } |
| 669 | /* Rule (3): if hole not lost */ |
| 670 | else if (seq_lt (hole->start, sb->high_sacked)) |
| 671 | { |
| 672 | *snd_limited = 1; |
| 673 | sb->cur_rxt_hole = scoreboard_hole_index (sb, hole); |
| 674 | } |
| 675 | /* Rule (4): if hole beyond high_sacked */ |
| 676 | else |
| 677 | { |
| 678 | ASSERT (seq_geq (hole->start, sb->high_sacked)); |
| 679 | *snd_limited = 1; |
| 680 | *can_rescue = 1; |
| 681 | /* HighRxt MUST NOT be updated */ |
| 682 | return 0; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | if (hole && seq_lt (sb->high_rxt, hole->start)) |
| 687 | sb->high_rxt = hole->start; |
| 688 | |
| 689 | return hole; |
| 690 | } |
| 691 | |
| 692 | void |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 693 | scoreboard_init_high_rxt (sack_scoreboard_t * sb, u32 seq) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 694 | { |
| 695 | sack_scoreboard_hole_t *hole; |
| 696 | hole = scoreboard_first_hole (sb); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 697 | if (hole) |
| 698 | { |
| 699 | seq = seq_gt (seq, hole->start) ? seq : hole->start; |
| 700 | sb->cur_rxt_hole = sb->head; |
| 701 | } |
| 702 | sb->high_rxt = seq; |
| 703 | } |
| 704 | |
| 705 | /** |
| 706 | * Test that scoreboard is sane after recovery |
| 707 | * |
| 708 | * Returns 1 if scoreboard is empty or if first hole beyond |
| 709 | * snd_una. |
| 710 | */ |
| 711 | u8 |
| 712 | tcp_scoreboard_is_sane_post_recovery (tcp_connection_t * tc) |
| 713 | { |
| 714 | sack_scoreboard_hole_t *hole; |
| 715 | hole = scoreboard_first_hole (&tc->sack_sb); |
| 716 | return (!hole || seq_geq (hole->start, tc->snd_una)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 717 | } |
| 718 | |
| 719 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 720 | tcp_rcv_sacks (tcp_connection_t * tc, u32 ack) |
| 721 | { |
| 722 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 723 | sack_block_t *blk, tmp; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 724 | sack_scoreboard_hole_t *hole, *next_hole, *last_hole; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 725 | u32 blk_index = 0, old_sacked_bytes, hole_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 726 | int i, j; |
| 727 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 728 | sb->last_sacked_bytes = 0; |
| 729 | sb->snd_una_adv = 0; |
| 730 | old_sacked_bytes = sb->sacked_bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 731 | sb->last_bytes_delivered = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 732 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 733 | if (!tcp_opts_sack (&tc->rcv_opts) |
| 734 | && sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 735 | return; |
| 736 | |
| 737 | /* Remove invalid blocks */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 738 | blk = tc->rcv_opts.sacks; |
| 739 | while (blk < vec_end (tc->rcv_opts.sacks)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 740 | { |
| 741 | if (seq_lt (blk->start, blk->end) |
| 742 | && seq_gt (blk->start, tc->snd_una) |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 743 | && seq_gt (blk->start, ack) && seq_leq (blk->end, tc->snd_una_max)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 744 | { |
| 745 | blk++; |
| 746 | continue; |
| 747 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 748 | vec_del1 (tc->rcv_opts.sacks, blk - tc->rcv_opts.sacks); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 749 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 750 | |
| 751 | /* Add block for cumulative ack */ |
| 752 | if (seq_gt (ack, tc->snd_una)) |
| 753 | { |
| 754 | tmp.start = tc->snd_una; |
| 755 | tmp.end = ack; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 756 | vec_add1 (tc->rcv_opts.sacks, tmp); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 757 | } |
| 758 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 759 | if (vec_len (tc->rcv_opts.sacks) == 0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 760 | return; |
| 761 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 762 | tcp_scoreboard_trace_add (tc, ack); |
| 763 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 764 | /* Make sure blocks are ordered */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 765 | for (i = 0; i < vec_len (tc->rcv_opts.sacks); i++) |
| 766 | for (j = i + 1; j < vec_len (tc->rcv_opts.sacks); j++) |
| 767 | 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] | 768 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 769 | tmp = tc->rcv_opts.sacks[i]; |
| 770 | tc->rcv_opts.sacks[i] = tc->rcv_opts.sacks[j]; |
| 771 | tc->rcv_opts.sacks[j] = tmp; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 772 | } |
| 773 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 774 | if (sb->head == TCP_INVALID_SACK_HOLE_INDEX) |
| 775 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 776 | /* If no holes, insert the first that covers all outstanding bytes */ |
| 777 | last_hole = scoreboard_insert_hole (sb, TCP_INVALID_SACK_HOLE_INDEX, |
| 778 | tc->snd_una, tc->snd_una_max); |
| 779 | sb->tail = scoreboard_hole_index (sb, last_hole); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 780 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
| 781 | sb->high_sacked = tmp.end; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 782 | } |
| 783 | else |
| 784 | { |
| 785 | /* If we have holes but snd_una_max is beyond the last hole, update |
| 786 | * last hole end */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 787 | tmp = tc->rcv_opts.sacks[vec_len (tc->rcv_opts.sacks) - 1]; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 788 | last_hole = scoreboard_last_hole (sb); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 789 | if (seq_gt (tc->snd_una_max, last_hole->end)) |
| 790 | { |
| 791 | if (seq_geq (last_hole->start, sb->high_sacked)) |
| 792 | { |
| 793 | last_hole->end = tc->snd_una_max; |
| 794 | } |
| 795 | /* New hole after high sacked block */ |
| 796 | else if (seq_lt (sb->high_sacked, tc->snd_una_max)) |
| 797 | { |
| 798 | scoreboard_insert_hole (sb, sb->tail, sb->high_sacked, |
| 799 | tc->snd_una_max); |
| 800 | } |
| 801 | } |
| 802 | /* Keep track of max byte sacked for when the last hole |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 803 | * is acked */ |
| 804 | if (seq_gt (tmp.end, sb->high_sacked)) |
| 805 | sb->high_sacked = tmp.end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* Walk the holes with the SACK blocks */ |
| 809 | hole = pool_elt_at_index (sb->holes, sb->head); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 810 | while (hole && blk_index < vec_len (tc->rcv_opts.sacks)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 811 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 812 | blk = &tc->rcv_opts.sacks[blk_index]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 813 | if (seq_leq (blk->start, hole->start)) |
| 814 | { |
| 815 | /* Block covers hole. Remove hole */ |
| 816 | if (seq_geq (blk->end, hole->end)) |
| 817 | { |
| 818 | next_hole = scoreboard_next_hole (sb, hole); |
| 819 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 820 | /* Byte accounting: snd_una needs to be advanced */ |
| 821 | if (blk->end == ack) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 822 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 823 | if (next_hole) |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 824 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 825 | if (seq_lt (ack, next_hole->start)) |
| 826 | sb->snd_una_adv = next_hole->start - ack; |
| 827 | sb->last_bytes_delivered += |
| 828 | next_hole->start - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 829 | } |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 830 | else |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 831 | { |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 832 | ASSERT (seq_geq (sb->high_sacked, ack)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 833 | sb->snd_una_adv = sb->high_sacked - ack; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 834 | sb->last_bytes_delivered += sb->high_sacked - hole->end; |
Florin Coras | 06d1101 | 2017-05-17 14:21:51 -0700 | [diff] [blame] | 835 | } |
| 836 | } |
| 837 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 838 | scoreboard_remove_hole (sb, hole); |
| 839 | hole = next_hole; |
| 840 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 841 | /* Partial 'head' overlap */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 842 | else |
| 843 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 844 | if (seq_gt (blk->end, hole->start)) |
| 845 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 846 | hole->start = blk->end; |
| 847 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 848 | blk_index++; |
| 849 | } |
| 850 | } |
| 851 | else |
| 852 | { |
| 853 | /* Hole must be split */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 854 | if (seq_lt (blk->end, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 855 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 856 | hole_index = scoreboard_hole_index (sb, hole); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 857 | next_hole = scoreboard_insert_hole (sb, hole_index, blk->end, |
| 858 | hole->end); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 859 | |
| 860 | /* Pool might've moved */ |
| 861 | hole = scoreboard_get_hole (sb, hole_index); |
| 862 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 863 | blk_index++; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 864 | ASSERT (hole->next == scoreboard_hole_index (sb, next_hole)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 865 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 866 | else if (seq_lt (blk->start, hole->end)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 867 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 868 | hole->end = blk->start; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 869 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 870 | hole = scoreboard_next_hole (sb, hole); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 871 | } |
| 872 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 873 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 874 | scoreboard_update_bytes (tc, sb); |
| 875 | sb->last_sacked_bytes = sb->sacked_bytes |
| 876 | - (old_sacked_bytes - sb->last_bytes_delivered); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 877 | ASSERT (sb->last_sacked_bytes <= sb->sacked_bytes); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 878 | ASSERT (sb->sacked_bytes == 0 |
| 879 | || sb->sacked_bytes < tc->snd_una_max - seq_max (tc->snd_una, ack)); |
| 880 | ASSERT (sb->last_sacked_bytes + sb->lost_bytes <= tc->snd_una_max |
| 881 | - seq_max (tc->snd_una, ack)); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 882 | ASSERT (sb->head == TCP_INVALID_SACK_HOLE_INDEX || tcp_in_recovery (tc) |
| 883 | || sb->holes[sb->head].start == ack + sb->snd_una_adv); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 884 | } |
| 885 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 886 | /** |
| 887 | * Try to update snd_wnd based on feedback received from peer. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 888 | * |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 889 | * If successful, and new window is 'effectively' 0, activate persist |
| 890 | * timer. |
| 891 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 892 | static void |
| 893 | tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd) |
| 894 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 895 | /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set |
| 896 | * 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] | 897 | if (seq_lt (tc->snd_wl1, seq) |
| 898 | || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 899 | { |
| 900 | tc->snd_wnd = snd_wnd; |
| 901 | tc->snd_wl1 = seq; |
| 902 | tc->snd_wl2 = ack; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 903 | TCP_EVT_DBG (TCP_EVT_SND_WND, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 904 | |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 905 | if (tc->snd_wnd < tc->snd_mss) |
| 906 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 907 | /* Set persist timer if not set and we just got 0 wnd */ |
| 908 | if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST) |
| 909 | && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)) |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 910 | tcp_persist_timer_set (tc); |
| 911 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 912 | else |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 913 | { |
| 914 | tcp_persist_timer_reset (tc); |
| 915 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 916 | { |
| 917 | tc->rto_boff = 0; |
| 918 | tcp_update_rto (tc); |
| 919 | } |
| 920 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 921 | } |
| 922 | } |
| 923 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 924 | void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 925 | tcp_cc_init_congestion (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 926 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 927 | tcp_fastrecovery_on (tc); |
| 928 | tc->snd_congestion = tc->snd_una_max; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 929 | tc->cc_algo->congestion (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 930 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 931 | } |
| 932 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 933 | static void |
| 934 | tcp_cc_recovery_exit (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 935 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 936 | /* Deflate rto */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 937 | tc->rto_boff = 0; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 938 | tcp_update_rto (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 939 | tc->snd_rxt_ts = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 940 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 941 | tcp_recovery_off (tc); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 942 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 943 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 944 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 945 | void |
| 946 | tcp_cc_fastrecovery_exit (tcp_connection_t * tc) |
| 947 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 948 | tc->cc_algo->recovered (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 949 | tc->snd_rxt_bytes = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 950 | tc->rcv_dupacks = 0; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 951 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 952 | tcp_fastrecovery_off (tc); |
| 953 | tcp_fastrecovery_1_smss_off (tc); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 954 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 955 | } |
| 956 | |
| 957 | static void |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 958 | tcp_cc_congestion_undo (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 959 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 960 | tc->cwnd = tc->prev_cwnd; |
| 961 | tc->ssthresh = tc->prev_ssthresh; |
| 962 | tc->snd_nxt = tc->snd_una_max; |
| 963 | tc->rcv_dupacks = 0; |
| 964 | if (tcp_in_recovery (tc)) |
| 965 | tcp_cc_recovery_exit (tc); |
| 966 | ASSERT (tc->rto_boff == 0); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 967 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 968 | /* TODO extend for fastrecovery */ |
| 969 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 970 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 971 | static u8 |
| 972 | tcp_cc_is_spurious_retransmit (tcp_connection_t * tc) |
| 973 | { |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 974 | return (tcp_in_recovery (tc) && tc->rto_boff == 1 |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 975 | && tc->snd_rxt_ts |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 976 | && tcp_opts_tstamp (&tc->rcv_opts) |
| 977 | && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts)); |
| 978 | } |
| 979 | |
| 980 | int |
| 981 | tcp_cc_recover (tcp_connection_t * tc) |
| 982 | { |
| 983 | ASSERT (tcp_in_cong_recovery (tc)); |
| 984 | if (tcp_cc_is_spurious_retransmit (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 985 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 986 | tcp_cc_congestion_undo (tc); |
| 987 | return 1; |
| 988 | } |
| 989 | |
| 990 | if (tcp_in_recovery (tc)) |
| 991 | tcp_cc_recovery_exit (tc); |
| 992 | else if (tcp_in_fastrecovery (tc)) |
| 993 | tcp_cc_fastrecovery_exit (tc); |
| 994 | |
| 995 | ASSERT (tc->rto_boff == 0); |
| 996 | ASSERT (!tcp_in_cong_recovery (tc)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 997 | ASSERT (tcp_scoreboard_is_sane_post_recovery (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | static void |
| 1002 | tcp_cc_update (tcp_connection_t * tc, vlib_buffer_t * b) |
| 1003 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1004 | ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1005 | |
| 1006 | /* Congestion avoidance */ |
| 1007 | tc->cc_algo->rcv_ack (tc); |
| 1008 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 1009 | |
| 1010 | /* If a cumulative ack, make sure dupacks is 0 */ |
| 1011 | tc->rcv_dupacks = 0; |
| 1012 | |
| 1013 | /* When dupacks hits the threshold we only enter fast retransmit if |
| 1014 | * cumulative ack covers more than snd_congestion. Should snd_una |
| 1015 | * wrap this test may fail under otherwise valid circumstances. |
| 1016 | * Therefore, proactively update snd_congestion when wrap detected. */ |
| 1017 | if (PREDICT_FALSE |
| 1018 | (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked) |
| 1019 | && seq_gt (tc->snd_congestion, tc->snd_una))) |
| 1020 | tc->snd_congestion = tc->snd_una - 1; |
| 1021 | } |
| 1022 | |
| 1023 | static u8 |
| 1024 | tcp_should_fastrecover_sack (tcp_connection_t * tc) |
| 1025 | { |
| 1026 | return (TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss < tc->sack_sb.sacked_bytes; |
| 1027 | } |
| 1028 | |
| 1029 | static u8 |
| 1030 | tcp_should_fastrecover (tcp_connection_t * tc) |
| 1031 | { |
| 1032 | return (tc->rcv_dupacks == TCP_DUPACK_THRESHOLD |
| 1033 | || tcp_should_fastrecover_sack (tc)); |
| 1034 | } |
| 1035 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1036 | /** |
| 1037 | * One function to rule them all ... and in the darkness bind them |
| 1038 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1039 | static void |
| 1040 | tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack) |
| 1041 | { |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1042 | u32 rxt_delivered; |
| 1043 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1044 | /* |
| 1045 | * Duplicate ACK. Check if we should enter fast recovery, or if already in |
| 1046 | * it account for the bytes that left the network. |
| 1047 | */ |
| 1048 | if (is_dack) |
| 1049 | { |
| 1050 | ASSERT (tc->snd_una != tc->snd_una_max |
| 1051 | || tc->sack_sb.last_sacked_bytes); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1052 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1053 | tc->rcv_dupacks++; |
| 1054 | |
| 1055 | if (tc->rcv_dupacks > TCP_DUPACK_THRESHOLD && !tc->bytes_acked) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1056 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1057 | ASSERT (tcp_in_fastrecovery (tc)); |
| 1058 | /* Pure duplicate ack. If some data got acked, it's handled lower */ |
| 1059 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1060 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1061 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1062 | else if (tcp_should_fastrecover (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1063 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1064 | /* Things are already bad */ |
| 1065 | if (tcp_in_cong_recovery (tc)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1066 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1067 | tc->rcv_dupacks = 0; |
| 1068 | goto partial_ack_test; |
| 1069 | } |
| 1070 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1071 | /* If of of the two conditions lower hold, reset dupacks because |
| 1072 | * we're probably after timeout (RFC6582 heuristics). |
| 1073 | * If Cumulative ack does not cover more than congestion threshold, |
| 1074 | * and: |
| 1075 | * 1) The following doesn't hold: The congestion window is greater |
| 1076 | * than SMSS bytes and the difference between highest_ack |
| 1077 | * and prev_highest_ack is at most 4*SMSS bytes |
| 1078 | * 2) Echoed timestamp in the last non-dup ack does not equal the |
| 1079 | * stored timestamp |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1080 | */ |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1081 | if (seq_leq (tc->snd_una, tc->snd_congestion) |
| 1082 | && ((!(tc->cwnd > tc->snd_mss |
| 1083 | && tc->bytes_acked <= 4 * tc->snd_mss)) |
| 1084 | || (tc->rcv_opts.tsecr != tc->tsecr_last_ack))) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1085 | { |
| 1086 | tc->rcv_dupacks = 0; |
| 1087 | return; |
| 1088 | } |
| 1089 | |
| 1090 | tcp_cc_init_congestion (tc); |
| 1091 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1092 | |
| 1093 | /* The first segment MUST be retransmitted */ |
| 1094 | tcp_retransmit_first_unacked (tc); |
| 1095 | |
| 1096 | /* Post retransmit update cwnd to ssthresh and account for the |
| 1097 | * three segments that have left the network and should've been |
| 1098 | * buffered at the receiver XXX */ |
| 1099 | tc->cwnd = tc->ssthresh + tc->rcv_dupacks * tc->snd_mss; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1100 | ASSERT (tc->cwnd >= tc->snd_mss); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1101 | |
| 1102 | /* If cwnd allows, send more data */ |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1103 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1104 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1105 | scoreboard_init_high_rxt (&tc->sack_sb, |
| 1106 | tc->snd_una + tc->snd_mss); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1107 | tcp_fast_retransmit_sack (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1108 | } |
| 1109 | else |
| 1110 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1111 | tcp_fast_retransmit_no_sack (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1112 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1113 | |
| 1114 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1115 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1116 | else if (!tc->bytes_acked |
| 1117 | || (tc->bytes_acked && !tcp_in_cong_recovery (tc))) |
| 1118 | { |
| 1119 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_DUPACK); |
| 1120 | return; |
| 1121 | } |
| 1122 | else |
| 1123 | goto partial_ack; |
| 1124 | } |
| 1125 | |
| 1126 | partial_ack_test: |
| 1127 | |
| 1128 | if (!tc->bytes_acked) |
| 1129 | return; |
| 1130 | |
| 1131 | partial_ack: |
| 1132 | /* |
| 1133 | * Legitimate ACK. 1) See if we can exit recovery |
| 1134 | */ |
| 1135 | /* XXX limit this only to first partial ack? */ |
| 1136 | tcp_retransmit_timer_update (tc); |
| 1137 | |
| 1138 | if (seq_geq (tc->snd_una, tc->snd_congestion)) |
| 1139 | { |
| 1140 | /* If spurious return, we've already updated everything */ |
| 1141 | if (tcp_cc_recover (tc)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1142 | { |
| 1143 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 1144 | return; |
| 1145 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1146 | |
| 1147 | tc->snd_nxt = tc->snd_una_max; |
| 1148 | |
| 1149 | /* Treat as congestion avoidance ack */ |
| 1150 | tc->cc_algo->rcv_ack (tc); |
| 1151 | tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| 1152 | return; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Legitimate ACK. 2) If PARTIAL ACK try to retransmit |
| 1157 | */ |
| 1158 | TCP_EVT_DBG (TCP_EVT_CC_PACK, tc); |
| 1159 | |
| 1160 | /* RFC6675: If the incoming ACK is a cumulative acknowledgment, |
| 1161 | * reset dupacks to 0 */ |
| 1162 | tc->rcv_dupacks = 0; |
| 1163 | |
| 1164 | tcp_retransmit_first_unacked (tc); |
| 1165 | |
| 1166 | /* Post RTO timeout don't try anything fancy */ |
| 1167 | if (tcp_in_recovery (tc)) |
| 1168 | return; |
| 1169 | |
| 1170 | /* Remove retransmitted bytes that have been delivered */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1171 | ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1172 | >= tc->sack_sb.last_bytes_delivered |
| 1173 | || (tc->flags & TCP_CONN_FINSNT)); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1174 | |
| 1175 | if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1176 | { |
| 1177 | /* If we have sacks and we haven't gotten an ack beyond high_rxt, |
| 1178 | * remove sacked bytes delivered */ |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1179 | rxt_delivered = tc->bytes_acked + tc->sack_sb.snd_una_adv |
| 1180 | - tc->sack_sb.last_bytes_delivered; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1181 | ASSERT (tc->snd_rxt_bytes >= rxt_delivered); |
| 1182 | tc->snd_rxt_bytes -= rxt_delivered; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1183 | } |
| 1184 | else |
| 1185 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1186 | /* Either all retransmitted holes have been acked, or we're |
| 1187 | * "in the blind" and retransmitting segment by segment */ |
| 1188 | tc->snd_rxt_bytes = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1189 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1190 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1191 | tc->cc_algo->rcv_cong_ack (tc, TCP_CC_PARTIALACK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1192 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1193 | /* |
| 1194 | * Since this was a partial ack, try to retransmit some more data |
| 1195 | */ |
| 1196 | tcp_fast_retransmit (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | void |
| 1200 | tcp_cc_init (tcp_connection_t * tc) |
| 1201 | { |
| 1202 | tc->cc_algo = tcp_cc_algo_get (TCP_CC_NEWRENO); |
| 1203 | tc->cc_algo->init (tc); |
| 1204 | } |
| 1205 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1206 | /** |
| 1207 | * Process incoming ACK |
| 1208 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1209 | static int |
| 1210 | tcp_rcv_ack (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1211 | tcp_header_t * th, u32 * next, u32 * error) |
| 1212 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1213 | u32 prev_snd_wnd, prev_snd_una; |
| 1214 | u8 is_dack; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1215 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1216 | TCP_EVT_DBG (TCP_EVT_CC_STAT, tc); |
| 1217 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1218 | /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1219 | 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] | 1220 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1221 | /* If we have outstanding data and this is within the window, accept it, |
| 1222 | * probably retransmit has timed out. Otherwise ACK segment and then |
| 1223 | * drop it */ |
| 1224 | if (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)) |
| 1225 | { |
| 1226 | tcp_make_ack (tc, b); |
| 1227 | *next = tcp_next_output (tc->c_is_ip4); |
| 1228 | *error = TCP_ERROR_ACK_INVALID; |
| 1229 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 0, |
| 1230 | vnet_buffer (b)->tcp.ack_number); |
| 1231 | return -1; |
| 1232 | } |
| 1233 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1234 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 2, |
| 1235 | vnet_buffer (b)->tcp.ack_number); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1236 | |
| 1237 | tc->snd_nxt = vnet_buffer (b)->tcp.ack_number; |
| 1238 | *error = TCP_ERROR_ACK_FUTURE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1239 | } |
| 1240 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1241 | /* If old ACK, probably it's an old dupack */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1242 | 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] | 1243 | { |
| 1244 | *error = TCP_ERROR_ACK_OLD; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1245 | TCP_EVT_DBG (TCP_EVT_ACK_RCV_ERR, tc, 1, |
| 1246 | vnet_buffer (b)->tcp.ack_number); |
| 1247 | if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD) |
| 1248 | { |
| 1249 | TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1250 | tcp_cc_handle_event (tc, 1); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1251 | } |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1252 | /* Don't drop yet */ |
| 1253 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1254 | } |
| 1255 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1256 | /* |
| 1257 | * Looks okay, process feedback |
| 1258 | */ |
| 1259 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1260 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1261 | tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number); |
| 1262 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1263 | prev_snd_wnd = tc->snd_wnd; |
| 1264 | prev_snd_una = tc->snd_una; |
| 1265 | tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number, |
| 1266 | vnet_buffer (b)->tcp.ack_number, |
| 1267 | clib_net_to_host_u16 (th->window) << tc->snd_wscale); |
| 1268 | tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una; |
| 1269 | tc->snd_una = vnet_buffer (b)->tcp.ack_number + tc->sack_sb.snd_una_adv; |
| 1270 | tcp_validate_txf_size (tc, tc->bytes_acked); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1271 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1272 | if (tc->bytes_acked) |
| 1273 | tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number); |
| 1274 | |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1275 | TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc); |
| 1276 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1277 | /* |
| 1278 | * Check if we have congestion event |
| 1279 | */ |
| 1280 | |
| 1281 | 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] | 1282 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1283 | tcp_cc_handle_event (tc, is_dack); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1284 | if (!tcp_in_cong_recovery (tc)) |
| 1285 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1286 | *error = TCP_ERROR_ACK_DUP; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1287 | TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1); |
| 1288 | return vnet_buffer (b)->tcp.data_len ? 0 : -1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1289 | } |
| 1290 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1291 | /* |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1292 | * Update congestion control (slow start/congestion avoidance) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1293 | */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1294 | tcp_cc_update (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1295 | |
| 1296 | return 0; |
| 1297 | } |
| 1298 | |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1299 | static u8 |
| 1300 | tcp_sack_vector_is_sane (sack_block_t * sacks) |
| 1301 | { |
| 1302 | int i; |
| 1303 | for (i = 1; i < vec_len (sacks); i++) |
| 1304 | { |
| 1305 | if (sacks[i - 1].end == sacks[i].start) |
| 1306 | return 0; |
| 1307 | } |
| 1308 | return 1; |
| 1309 | } |
| 1310 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1311 | /** |
| 1312 | * Build SACK list as per RFC2018. |
| 1313 | * |
| 1314 | * Makes sure the first block contains the segment that generated the current |
| 1315 | * ACK and the following ones are the ones most recently reported in SACK |
| 1316 | * blocks. |
| 1317 | * |
| 1318 | * @param tc TCP connection for which the SACK list is updated |
| 1319 | * @param start Start sequence number of the newest SACK block |
| 1320 | * @param end End sequence of the newest SACK block |
| 1321 | */ |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1322 | void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1323 | tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end) |
| 1324 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1325 | sack_block_t *new_list = 0, *block = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1326 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1327 | |
| 1328 | /* If the first segment is ooo add it to the list. Last write might've moved |
| 1329 | * rcv_nxt over the first segment. */ |
| 1330 | if (seq_lt (tc->rcv_nxt, start)) |
| 1331 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1332 | vec_add2 (new_list, block, 1); |
| 1333 | block->start = start; |
| 1334 | block->end = end; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1335 | } |
| 1336 | |
| 1337 | /* Find the blocks still worth keeping. */ |
| 1338 | for (i = 0; i < vec_len (tc->snd_sacks); i++) |
| 1339 | { |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1340 | /* Discard if rcv_nxt advanced beyond current block */ |
| 1341 | if (seq_leq (tc->snd_sacks[i].start, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1342 | continue; |
| 1343 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1344 | /* Merge or drop if segment overlapped by the new segment */ |
| 1345 | if (block && (seq_geq (tc->snd_sacks[i].end, new_list[0].start) |
| 1346 | && seq_leq (tc->snd_sacks[i].start, new_list[0].end))) |
| 1347 | { |
| 1348 | if (seq_lt (tc->snd_sacks[i].start, new_list[0].start)) |
| 1349 | new_list[0].start = tc->snd_sacks[i].start; |
| 1350 | if (seq_lt (new_list[0].end, tc->snd_sacks[i].end)) |
| 1351 | new_list[0].end = tc->snd_sacks[i].end; |
| 1352 | continue; |
| 1353 | } |
| 1354 | |
| 1355 | /* Save to new SACK list if we have space. */ |
| 1356 | if (vec_len (new_list) < TCP_MAX_SACK_BLOCKS) |
| 1357 | { |
| 1358 | vec_add1 (new_list, tc->snd_sacks[i]); |
| 1359 | } |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1360 | else |
| 1361 | { |
| 1362 | clib_warning ("sack discarded"); |
| 1363 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1364 | } |
| 1365 | |
Florin Coras | 45d3496 | 2017-04-25 00:05:27 -0700 | [diff] [blame] | 1366 | ASSERT (vec_len (new_list) <= TCP_MAX_SACK_BLOCKS); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1367 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1368 | /* Replace old vector with new one */ |
| 1369 | vec_free (tc->snd_sacks); |
| 1370 | tc->snd_sacks = new_list; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1371 | |
| 1372 | /* Segments should not 'touch' */ |
| 1373 | ASSERT (tcp_sack_vector_is_sane (tc->snd_sacks)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1374 | } |
| 1375 | |
| 1376 | /** Enqueue data for delivery to application */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1377 | always_inline int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1378 | tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1379 | u16 data_len) |
| 1380 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1381 | int written, error = TCP_ERROR_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1382 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1383 | ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
| 1384 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1385 | /* Pure ACK. Update rcv_nxt and be done. */ |
| 1386 | if (PREDICT_FALSE (data_len == 0)) |
| 1387 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1388 | return TCP_ERROR_PURE_ACK; |
| 1389 | } |
| 1390 | |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1391 | written = stream_session_enqueue_data (&tc->connection, b, 0, |
| 1392 | 1 /* queue event */ , 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1393 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1394 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 0, data_len, written); |
| 1395 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1396 | /* Update rcv_nxt */ |
| 1397 | if (PREDICT_TRUE (written == data_len)) |
| 1398 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1399 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1400 | } |
| 1401 | /* If more data written than expected, account for out-of-order bytes. */ |
| 1402 | else if (written > data_len) |
| 1403 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1404 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1405 | |
| 1406 | /* Send ACK confirming the update */ |
| 1407 | tc->flags |= TCP_CONN_SNDACK; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1408 | } |
| 1409 | else if (written > 0) |
| 1410 | { |
| 1411 | /* We've written something but FIFO is probably full now */ |
| 1412 | tc->rcv_nxt += written; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1413 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1414 | /* Depending on how fast the app is, all remaining buffers in burst will |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1415 | * not be enqueued. Inform peer */ |
| 1416 | tc->flags |= TCP_CONN_SNDACK; |
| 1417 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1418 | error = TCP_ERROR_PARTIALLY_ENQUEUED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1419 | } |
| 1420 | else |
| 1421 | { |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1422 | tc->flags |= TCP_CONN_SNDACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1423 | return TCP_ERROR_FIFO_FULL; |
| 1424 | } |
| 1425 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1426 | /* Update SACK list if need be */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1427 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1428 | { |
| 1429 | /* Remove SACK blocks that have been delivered */ |
| 1430 | tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt); |
| 1431 | } |
| 1432 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1433 | return error; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1434 | } |
| 1435 | |
| 1436 | /** Enqueue out-of-order data */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1437 | always_inline int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1438 | tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b, |
| 1439 | u16 data_len) |
| 1440 | { |
| 1441 | stream_session_t *s0; |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1442 | int rv, offset; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1443 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1444 | ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)); |
| 1445 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1446 | /* Pure ACK. Do nothing */ |
| 1447 | if (PREDICT_FALSE (data_len == 0)) |
| 1448 | { |
| 1449 | return TCP_ERROR_PURE_ACK; |
| 1450 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1451 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1452 | /* Enqueue out-of-order data with relative offset */ |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1453 | rv = stream_session_enqueue_data (&tc->connection, b, |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1454 | vnet_buffer (b)->tcp.seq_number - |
| 1455 | tc->rcv_nxt, 0 /* queue event */ , 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1456 | |
| 1457 | /* Nothing written */ |
| 1458 | if (rv) |
| 1459 | { |
| 1460 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, 0); |
| 1461 | return TCP_ERROR_FIFO_FULL; |
| 1462 | } |
| 1463 | |
| 1464 | TCP_EVT_DBG (TCP_EVT_INPUT, tc, 1, data_len, data_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1465 | |
| 1466 | /* Update SACK list if in use */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1467 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1468 | { |
| 1469 | ooo_segment_t *newest; |
| 1470 | u32 start, end; |
| 1471 | |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 1472 | s0 = stream_session_get (tc->c_s_index, tc->c_thread_index); |
| 1473 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1474 | /* Get the newest segment from the fifo */ |
| 1475 | newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1476 | if (newest) |
| 1477 | { |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1478 | offset = ooo_segment_offset (s0->server_rx_fifo, newest); |
| 1479 | ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt); |
| 1480 | start = tc->rcv_nxt + offset; |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1481 | end = start + ooo_segment_length (s0->server_rx_fifo, newest); |
| 1482 | tcp_update_sack_list (tc, start, end); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 1483 | svm_fifo_newest_ooo_segment_reset (s0->server_rx_fifo); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1484 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1485 | } |
| 1486 | |
| 1487 | return TCP_ERROR_ENQUEUED; |
| 1488 | } |
| 1489 | |
| 1490 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1491 | * Check if ACK could be delayed. If ack can be delayed, it should return |
| 1492 | * true for a full frame. If we're always acking return 0. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1493 | */ |
| 1494 | always_inline int |
| 1495 | tcp_can_delack (tcp_connection_t * tc) |
| 1496 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1497 | /* Send ack if ... */ |
| 1498 | if (TCP_ALWAYS_ACK |
| 1499 | /* just sent a rcv wnd 0 */ |
| 1500 | || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0 |
| 1501 | /* constrained to send ack */ |
| 1502 | || (tc->flags & TCP_CONN_SNDACK) != 0 |
| 1503 | /* we're almost out of tx wnd */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1504 | || tcp_available_snd_space (tc) < 4 * tc->snd_mss) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1505 | return 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1506 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1507 | return 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1508 | } |
| 1509 | |
| 1510 | static int |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1511 | tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop) |
| 1512 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1513 | u32 discard, first = b->current_length; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1514 | vlib_main_t *vm = vlib_get_main (); |
| 1515 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1516 | /* Handle multi-buffer segments */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1517 | if (n_bytes_to_drop > b->current_length) |
| 1518 | { |
| 1519 | if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1520 | return -1; |
| 1521 | do |
| 1522 | { |
| 1523 | discard = clib_min (n_bytes_to_drop, b->current_length); |
| 1524 | vlib_buffer_advance (b, discard); |
| 1525 | b = vlib_get_buffer (vm, b->next_buffer); |
| 1526 | n_bytes_to_drop -= discard; |
| 1527 | } |
| 1528 | while (n_bytes_to_drop); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1529 | if (n_bytes_to_drop > first) |
| 1530 | b->total_length_not_including_first_buffer -= n_bytes_to_drop - first; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1531 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1532 | else |
| 1533 | vlib_buffer_advance (b, n_bytes_to_drop); |
| 1534 | vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1535 | return 0; |
| 1536 | } |
| 1537 | |
| 1538 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1539 | tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b, |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1540 | u32 * next0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1541 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1542 | u32 error = 0, n_bytes_to_drop, n_data_bytes; |
| 1543 | |
| 1544 | vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset); |
| 1545 | n_data_bytes = vnet_buffer (b)->tcp.data_len; |
| 1546 | ASSERT (n_data_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1547 | |
| 1548 | /* Handle out-of-order data */ |
| 1549 | if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt)) |
| 1550 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1551 | /* Old sequence numbers allowed through because they overlapped |
| 1552 | * the rx window */ |
| 1553 | if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1554 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1555 | error = TCP_ERROR_SEGMENT_OLD; |
| 1556 | *next0 = TCP_NEXT_DROP; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1557 | |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1558 | /* Completely in the past (possible retransmit) */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1559 | if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1560 | { |
| 1561 | /* Ack retransmissions since we may not have any data to send */ |
| 1562 | tcp_make_ack (tc, b); |
| 1563 | *next0 = tcp_next_output (tc->c_is_ip4); |
| 1564 | goto done; |
| 1565 | } |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 1566 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1567 | /* Chop off the bytes in the past */ |
| 1568 | n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number; |
| 1569 | n_data_bytes -= n_bytes_to_drop; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1570 | vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1571 | if (tcp_buffer_discard_bytes (b, n_bytes_to_drop)) |
| 1572 | goto done; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1573 | |
| 1574 | goto in_order; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1575 | } |
| 1576 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1577 | error = tcp_session_enqueue_ooo (tc, b, n_data_bytes); |
| 1578 | |
| 1579 | /* N.B. Should not filter burst of dupacks. Two issues 1) dupacks open |
| 1580 | * cwnd on remote peer when congested 2) acks leaving should have the |
| 1581 | * latest rcv_wnd since the burst may eaten up all of it, so only the |
| 1582 | * old ones could be filtered. |
| 1583 | */ |
| 1584 | |
| 1585 | /* RFC2581: Send DUPACK for fast retransmit */ |
| 1586 | tcp_make_ack (tc, b); |
| 1587 | *next0 = tcp_next_output (tc->c_is_ip4); |
| 1588 | |
| 1589 | /* Mark as DUPACK. We may filter these in output if |
| 1590 | * the burst fills the holes. */ |
| 1591 | if (n_data_bytes) |
| 1592 | vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_DUPACK; |
| 1593 | |
| 1594 | TCP_EVT_DBG (TCP_EVT_DUPACK_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1595 | goto done; |
| 1596 | } |
| 1597 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1598 | in_order: |
| 1599 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1600 | /* In order data, enqueue. Fifo figures out by itself if any out-of-order |
| 1601 | * segments can be enqueued after fifo tail offset changes. */ |
| 1602 | error = tcp_session_enqueue_data (tc, b, n_data_bytes); |
| 1603 | |
| 1604 | /* Check if ACK can be delayed */ |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1605 | if (tcp_can_delack (tc)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1606 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1607 | if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK)) |
| 1608 | tcp_timer_set (tc, TCP_TIMER_DELACK, TCP_DELACK_TIME); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1609 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1610 | } |
| 1611 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1612 | *next0 = tcp_next_output (tc->c_is_ip4); |
| 1613 | tcp_make_ack (tc, b); |
| 1614 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1615 | done: |
| 1616 | return error; |
| 1617 | } |
| 1618 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1619 | typedef struct |
| 1620 | { |
| 1621 | tcp_header_t tcp_header; |
| 1622 | tcp_connection_t tcp_connection; |
| 1623 | } tcp_rx_trace_t; |
| 1624 | |
| 1625 | u8 * |
| 1626 | format_tcp_rx_trace (u8 * s, va_list * args) |
| 1627 | { |
| 1628 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1629 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1630 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1631 | uword indent = format_get_indent (s); |
| 1632 | |
| 1633 | s = format (s, "%U\n%U%U", |
| 1634 | format_tcp_header, &t->tcp_header, 128, |
| 1635 | format_white_space, indent, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1636 | format_tcp_connection, &t->tcp_connection, 1); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1637 | |
| 1638 | return s; |
| 1639 | } |
| 1640 | |
| 1641 | u8 * |
| 1642 | format_tcp_rx_trace_short (u8 * s, va_list * args) |
| 1643 | { |
| 1644 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 1645 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
| 1646 | tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *); |
| 1647 | |
| 1648 | s = format (s, "%d -> %d (%U)", |
| 1649 | clib_net_to_host_u16 (t->tcp_header.src_port), |
| 1650 | clib_net_to_host_u16 (t->tcp_header.dst_port), format_tcp_state, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1651 | t->tcp_connection.state); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1652 | |
| 1653 | return s; |
| 1654 | } |
| 1655 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1656 | void |
| 1657 | tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0, |
| 1658 | tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4) |
| 1659 | { |
| 1660 | if (tc0) |
| 1661 | { |
| 1662 | clib_memcpy (&t0->tcp_connection, tc0, sizeof (t0->tcp_connection)); |
| 1663 | } |
| 1664 | else |
| 1665 | { |
| 1666 | th0 = tcp_buffer_hdr (b0); |
| 1667 | } |
| 1668 | clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
| 1669 | } |
| 1670 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1671 | always_inline void |
| 1672 | tcp_established_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1673 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1674 | if (PREDICT_TRUE (!val)) |
| 1675 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1676 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1677 | if (is_ip4) |
| 1678 | vlib_node_increment_counter (vm, tcp4_established_node.index, evt, val); |
| 1679 | else |
| 1680 | vlib_node_increment_counter (vm, tcp6_established_node.index, evt, val); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1681 | } |
| 1682 | |
| 1683 | always_inline uword |
| 1684 | tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1685 | vlib_frame_t * from_frame, int is_ip4) |
| 1686 | { |
| 1687 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1688 | u32 my_thread_index = vm->thread_index, errors = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1689 | tcp_main_t *tm = vnet_get_tcp_main (); |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 1690 | u8 is_fin = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1691 | |
| 1692 | from = vlib_frame_vector_args (from_frame); |
| 1693 | n_left_from = from_frame->n_vectors; |
| 1694 | |
| 1695 | next_index = node->cached_next_index; |
| 1696 | |
| 1697 | while (n_left_from > 0) |
| 1698 | { |
| 1699 | u32 n_left_to_next; |
| 1700 | |
| 1701 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1702 | while (n_left_from > 0 && n_left_to_next > 0) |
| 1703 | { |
| 1704 | u32 bi0; |
| 1705 | vlib_buffer_t *b0; |
| 1706 | tcp_header_t *th0 = 0; |
| 1707 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1708 | u32 next0 = TCP_ESTABLISHED_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; |
| 1709 | |
| 1710 | bi0 = from[0]; |
| 1711 | to_next[0] = bi0; |
| 1712 | from += 1; |
| 1713 | to_next += 1; |
| 1714 | n_left_from -= 1; |
| 1715 | n_left_to_next -= 1; |
| 1716 | |
| 1717 | b0 = vlib_get_buffer (vm, bi0); |
| 1718 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 1719 | my_thread_index); |
| 1720 | |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1721 | if (PREDICT_FALSE (tc0 == 0)) |
| 1722 | { |
| 1723 | error0 = TCP_ERROR_INVALID_CONNECTION; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1724 | goto done; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1725 | } |
| 1726 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1727 | th0 = tcp_buffer_hdr (b0); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1728 | /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a |
| 1729 | * dangling reference. */ |
| 1730 | is_fin = tcp_is_fin (th0); |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 1731 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1732 | /* SYNs, FINs and data consume sequence numbers */ |
| 1733 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1734 | + tcp_is_syn (th0) + is_fin + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1735 | |
| 1736 | /* TODO header prediction fast path */ |
| 1737 | |
| 1738 | /* 1-4: check SEQ, RST, SYN */ |
| 1739 | if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, th0, &next0))) |
| 1740 | { |
| 1741 | error0 = TCP_ERROR_SEGMENT_INVALID; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1742 | TCP_EVT_DBG (TCP_EVT_SEG_INVALID, tc0, |
| 1743 | vnet_buffer (b0)->tcp.seq_number, |
| 1744 | vnet_buffer (b0)->tcp.seq_end); |
| 1745 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1746 | } |
| 1747 | |
| 1748 | /* 5: check the ACK field */ |
| 1749 | if (tcp_rcv_ack (tc0, b0, th0, &next0, &error0)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1750 | goto done; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1751 | |
| 1752 | /* 6: check the URG bit TODO */ |
| 1753 | |
| 1754 | /* 7: process the segment text */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1755 | if (vnet_buffer (b0)->tcp.data_len) |
| 1756 | error0 = tcp_segment_rcv (tm, tc0, b0, &next0); |
Dave Barach | 1f75cfd | 2017-04-14 16:46:44 -0400 | [diff] [blame] | 1757 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1758 | /* 8: check the FIN bit */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1759 | if (PREDICT_FALSE (is_fin)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1760 | { |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1761 | /* Enter CLOSE-WAIT and notify session. To avoid lingering |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1762 | * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1763 | /* Account for the FIN if nothing else was received */ |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1764 | if (vnet_buffer (b0)->tcp.data_len == 0) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1765 | tc0->rcv_nxt += 1; |
| 1766 | tcp_make_ack (tc0, b0); |
| 1767 | next0 = tcp_next_output (tc0->c_is_ip4); |
| 1768 | tc0->state = TCP_STATE_CLOSE_WAIT; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1769 | stream_session_disconnect_notify (&tc0->connection); |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1770 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1771 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1772 | } |
| 1773 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1774 | done: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1775 | b0->error = node->errors[error0]; |
| 1776 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 1777 | { |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1778 | tcp_rx_trace_t *t0 = |
| 1779 | vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 1780 | tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1781 | } |
| 1782 | |
| 1783 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 1784 | n_left_to_next, bi0, next0); |
| 1785 | } |
| 1786 | |
| 1787 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 1788 | } |
| 1789 | |
| 1790 | errors = session_manager_flush_enqueue_events (my_thread_index); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1791 | tcp_established_inc_counter (vm, is_ip4, TCP_ERROR_EVENT_FIFO_FULL, errors); |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1792 | tcp_flush_frame_to_output (vm, my_thread_index, is_ip4); |
| 1793 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1794 | return from_frame->n_vectors; |
| 1795 | } |
| 1796 | |
| 1797 | static uword |
| 1798 | tcp4_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1799 | vlib_frame_t * from_frame) |
| 1800 | { |
| 1801 | return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 1802 | } |
| 1803 | |
| 1804 | static uword |
| 1805 | tcp6_established (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1806 | vlib_frame_t * from_frame) |
| 1807 | { |
| 1808 | return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 1809 | } |
| 1810 | |
| 1811 | /* *INDENT-OFF* */ |
| 1812 | VLIB_REGISTER_NODE (tcp4_established_node) = |
| 1813 | { |
| 1814 | .function = tcp4_established, |
| 1815 | .name = "tcp4-established", |
| 1816 | /* Takes a vector of packets. */ |
| 1817 | .vector_size = sizeof (u32), |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 1818 | .n_errors = TCP_N_ERROR, |
| 1819 | .error_strings = tcp_error_strings, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1820 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 1821 | .next_nodes = |
| 1822 | { |
| 1823 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 1824 | foreach_tcp_state_next |
| 1825 | #undef _ |
| 1826 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1827 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1828 | }; |
| 1829 | /* *INDENT-ON* */ |
| 1830 | |
| 1831 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_established_node, tcp4_established); |
| 1832 | |
| 1833 | /* *INDENT-OFF* */ |
| 1834 | VLIB_REGISTER_NODE (tcp6_established_node) = |
| 1835 | { |
| 1836 | .function = tcp6_established, |
| 1837 | .name = "tcp6-established", |
| 1838 | /* Takes a vector of packets. */ |
| 1839 | .vector_size = sizeof (u32), |
| 1840 | .n_errors = TCP_N_ERROR, |
| 1841 | .error_strings = tcp_error_strings, |
| 1842 | .n_next_nodes = TCP_ESTABLISHED_N_NEXT, |
| 1843 | .next_nodes = |
| 1844 | { |
| 1845 | #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n, |
| 1846 | foreach_tcp_state_next |
| 1847 | #undef _ |
| 1848 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1849 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1850 | }; |
| 1851 | /* *INDENT-ON* */ |
| 1852 | |
| 1853 | |
| 1854 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_established_node, tcp6_established); |
| 1855 | |
| 1856 | vlib_node_registration_t tcp4_syn_sent_node; |
| 1857 | vlib_node_registration_t tcp6_syn_sent_node; |
| 1858 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1859 | static u8 |
| 1860 | tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr) |
| 1861 | { |
| 1862 | transport_connection_t *tmp; |
| 1863 | if (!tc) |
| 1864 | return 1; |
| 1865 | |
| 1866 | u8 is_valid = (tc->c_lcl_port == hdr->dst_port |
| 1867 | && (tc->state == TCP_STATE_LISTEN |
| 1868 | || tc->c_rmt_port == hdr->src_port)); |
| 1869 | |
| 1870 | if (!is_valid) |
| 1871 | { |
| 1872 | if ((tmp = |
| 1873 | stream_session_half_open_lookup (&tc->c_lcl_ip, &tc->c_rmt_ip, |
| 1874 | tc->c_lcl_port, tc->c_rmt_port, |
| 1875 | tc->c_transport_proto))) |
| 1876 | { |
| 1877 | if (tmp->lcl_port == hdr->dst_port |
| 1878 | && tmp->rmt_port == hdr->src_port) |
| 1879 | { |
| 1880 | clib_warning ("half-open is valid!"); |
| 1881 | } |
| 1882 | } |
| 1883 | } |
| 1884 | return is_valid; |
| 1885 | } |
| 1886 | |
| 1887 | /** |
| 1888 | * Lookup transport connection |
| 1889 | */ |
| 1890 | static tcp_connection_t * |
| 1891 | tcp_lookup_connection (vlib_buffer_t * b, u8 thread_index, u8 is_ip4) |
| 1892 | { |
| 1893 | tcp_header_t *tcp; |
| 1894 | transport_connection_t *tconn; |
| 1895 | tcp_connection_t *tc; |
| 1896 | if (is_ip4) |
| 1897 | { |
| 1898 | ip4_header_t *ip4; |
| 1899 | ip4 = vlib_buffer_get_current (b); |
| 1900 | tcp = ip4_next_header (ip4); |
| 1901 | tconn = stream_session_lookup_transport_wt4 (&ip4->dst_address, |
| 1902 | &ip4->src_address, |
| 1903 | tcp->dst_port, |
| 1904 | tcp->src_port, |
| 1905 | SESSION_TYPE_IP4_TCP, |
| 1906 | thread_index); |
| 1907 | tc = tcp_get_connection_from_transport (tconn); |
| 1908 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 1909 | } |
| 1910 | else |
| 1911 | { |
| 1912 | ip6_header_t *ip6; |
| 1913 | ip6 = vlib_buffer_get_current (b); |
| 1914 | tcp = ip6_next_header (ip6); |
| 1915 | tconn = stream_session_lookup_transport_wt6 (&ip6->dst_address, |
| 1916 | &ip6->src_address, |
| 1917 | tcp->dst_port, |
| 1918 | tcp->src_port, |
| 1919 | SESSION_TYPE_IP6_TCP, |
| 1920 | thread_index); |
| 1921 | tc = tcp_get_connection_from_transport (tconn); |
| 1922 | ASSERT (tcp_lookup_is_valid (tc, tcp)); |
| 1923 | } |
| 1924 | return tc; |
| 1925 | } |
| 1926 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1927 | always_inline uword |
| 1928 | tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1929 | vlib_frame_t * from_frame, int is_ip4) |
| 1930 | { |
| 1931 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 1932 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1933 | u32 my_thread_index = vm->thread_index, errors = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1934 | |
| 1935 | from = vlib_frame_vector_args (from_frame); |
| 1936 | n_left_from = from_frame->n_vectors; |
| 1937 | |
| 1938 | next_index = node->cached_next_index; |
| 1939 | |
| 1940 | while (n_left_from > 0) |
| 1941 | { |
| 1942 | u32 n_left_to_next; |
| 1943 | |
| 1944 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 1945 | |
| 1946 | while (n_left_from > 0 && n_left_to_next > 0) |
| 1947 | { |
| 1948 | u32 bi0, ack0, seq0; |
| 1949 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 1950 | tcp_rx_trace_t *t0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1951 | tcp_header_t *tcp0 = 0; |
| 1952 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1953 | tcp_connection_t *new_tc0; |
| 1954 | u32 next0 = TCP_SYN_SENT_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; |
| 1955 | |
| 1956 | bi0 = from[0]; |
| 1957 | to_next[0] = bi0; |
| 1958 | from += 1; |
| 1959 | to_next += 1; |
| 1960 | n_left_from -= 1; |
| 1961 | n_left_to_next -= 1; |
| 1962 | |
| 1963 | b0 = vlib_get_buffer (vm, bi0); |
| 1964 | tc0 = |
| 1965 | tcp_half_open_connection_get (vnet_buffer (b0)-> |
| 1966 | tcp.connection_index); |
Dave Barach | d84ba85 | 2017-08-22 17:56:46 -0400 | [diff] [blame] | 1967 | if (PREDICT_FALSE (tc0 == 0)) |
| 1968 | { |
| 1969 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 1970 | goto drop; |
| 1971 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1972 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1973 | /* Half-open completed recently but the connection was't removed |
| 1974 | * yet by the owning thread */ |
| 1975 | if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE)) |
| 1976 | { |
| 1977 | /* Make sure the connection actually exists */ |
| 1978 | ASSERT (tcp_lookup_connection (b0, my_thread_index, is_ip4)); |
| 1979 | goto drop; |
| 1980 | } |
| 1981 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1982 | ack0 = vnet_buffer (b0)->tcp.ack_number; |
| 1983 | seq0 = vnet_buffer (b0)->tcp.seq_number; |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1984 | tcp0 = tcp_buffer_hdr (b0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1985 | |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1986 | /* Crude check to see if the connection handle does not match |
| 1987 | * the packet. Probably connection just switched to established */ |
| 1988 | if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port |
| 1989 | || tcp0->src_port != tc0->c_rmt_port)) |
| 1990 | goto drop; |
| 1991 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1992 | if (PREDICT_FALSE |
| 1993 | (!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0))) |
| 1994 | goto drop; |
| 1995 | |
| 1996 | /* SYNs, FINs and data consume sequence numbers */ |
| 1997 | vnet_buffer (b0)->tcp.seq_end = seq0 + tcp_is_syn (tcp0) |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 1998 | + tcp_is_fin (tcp0) + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1999 | |
| 2000 | /* |
| 2001 | * 1. check the ACK bit |
| 2002 | */ |
| 2003 | |
| 2004 | /* |
| 2005 | * If the ACK bit is set |
| 2006 | * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless |
| 2007 | * the RST bit is set, if so drop the segment and return) |
| 2008 | * <SEQ=SEG.ACK><CTL=RST> |
| 2009 | * and discard the segment. Return. |
| 2010 | * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable. |
| 2011 | */ |
| 2012 | if (tcp_ack (tcp0)) |
| 2013 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2014 | if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2015 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2016 | clib_warning ("ack not in rcv wnd"); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2017 | if (!tcp_rst (tcp0)) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2018 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2019 | goto drop; |
| 2020 | } |
| 2021 | |
| 2022 | /* Make sure ACK is valid */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2023 | if (seq_gt (tc0->snd_una, ack0)) |
| 2024 | { |
| 2025 | clib_warning ("ack invalid"); |
| 2026 | goto drop; |
| 2027 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2028 | } |
| 2029 | |
| 2030 | /* |
| 2031 | * 2. check the RST bit |
| 2032 | */ |
| 2033 | |
| 2034 | if (tcp_rst (tcp0)) |
| 2035 | { |
| 2036 | /* If ACK is acceptable, signal client that peer is not |
| 2037 | * willing to accept connection and drop connection*/ |
| 2038 | if (tcp_ack (tcp0)) |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2039 | tcp_connection_reset (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2040 | goto drop; |
| 2041 | } |
| 2042 | |
| 2043 | /* |
| 2044 | * 3. check the security and precedence (skipped) |
| 2045 | */ |
| 2046 | |
| 2047 | /* |
| 2048 | * 4. check the SYN bit |
| 2049 | */ |
| 2050 | |
| 2051 | /* No SYN flag. Drop. */ |
| 2052 | if (!tcp_syn (tcp0)) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2053 | { |
| 2054 | clib_warning ("not synack"); |
| 2055 | goto drop; |
| 2056 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2057 | |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2058 | /* Parse options */ |
| 2059 | if (tcp_options_parse (tcp0, &tc0->rcv_opts)) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2060 | { |
| 2061 | clib_warning ("options parse fail"); |
| 2062 | goto drop; |
| 2063 | } |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2064 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2065 | /* Valid SYN or SYN-ACK. Move connection from half-open pool to |
| 2066 | * current thread pool. */ |
| 2067 | pool_get (tm->connections[my_thread_index], new_tc0); |
| 2068 | clib_memcpy (new_tc0, tc0, sizeof (*new_tc0)); |
Dave Barach | 259cdae | 2017-05-15 16:27:05 -0400 | [diff] [blame] | 2069 | new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index]; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2070 | new_tc0->c_thread_index = my_thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2071 | new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end; |
| 2072 | new_tc0->irs = seq0; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2073 | new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID; |
| 2074 | new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = |
| 2075 | TCP_TIMER_HANDLE_INVALID; |
| 2076 | |
| 2077 | /* If this is not the owning thread, wait for syn retransmit to |
| 2078 | * expire and cleanup then */ |
| 2079 | if (tcp_half_open_connection_cleanup (tc0)) |
| 2080 | tc0->flags |= TCP_CONN_HALF_OPEN_DONE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2081 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2082 | if (tcp_opts_tstamp (&new_tc0->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2083 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2084 | new_tc0->tsval_recent = new_tc0->rcv_opts.tsval; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2085 | new_tc0->tsval_recent_age = tcp_time_now (); |
| 2086 | } |
| 2087 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2088 | if (tcp_opts_wscale (&new_tc0->rcv_opts)) |
| 2089 | new_tc0->snd_wscale = new_tc0->rcv_opts.wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2090 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2091 | /* RFC1323: SYN and SYN-ACK wnd not scaled */ |
| 2092 | new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2093 | new_tc0->snd_wl1 = seq0; |
| 2094 | new_tc0->snd_wl2 = ack0; |
| 2095 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2096 | tcp_connection_init_vars (new_tc0); |
| 2097 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2098 | /* SYN-ACK: See if we can switch to ESTABLISHED state */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2099 | if (PREDICT_TRUE (tcp_ack (tcp0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2100 | { |
| 2101 | /* Our SYN is ACKed: we have iss < ack = snd_una */ |
| 2102 | |
| 2103 | /* TODO Dequeue acknowledged segments if we support Fast Open */ |
| 2104 | new_tc0->snd_una = ack0; |
| 2105 | new_tc0->state = TCP_STATE_ESTABLISHED; |
| 2106 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2107 | /* Make sure las is initialized for the wnd computation */ |
| 2108 | new_tc0->rcv_las = new_tc0->rcv_nxt; |
| 2109 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2110 | /* Notify app that we have connection. If session layer can't |
| 2111 | * allocate session send reset */ |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2112 | if (stream_session_connect_notify (&new_tc0->connection, 0)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2113 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2114 | clib_warning ("connect notify fail"); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2115 | tcp_send_reset_w_pkt (new_tc0, b0, is_ip4); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2116 | tcp_connection_cleanup (new_tc0); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2117 | goto drop; |
| 2118 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2119 | |
| 2120 | /* Make sure after data segment processing ACK is sent */ |
| 2121 | new_tc0->flags |= TCP_CONN_SNDACK; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2122 | |
| 2123 | /* Update rtt with the syn-ack sample */ |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2124 | tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2125 | TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2126 | } |
| 2127 | /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */ |
| 2128 | else |
| 2129 | { |
| 2130 | new_tc0->state = TCP_STATE_SYN_RCVD; |
| 2131 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2132 | /* Notify app that we have connection */ |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 2133 | if (stream_session_connect_notify (&new_tc0->connection, 0)) |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2134 | { |
| 2135 | tcp_connection_cleanup (new_tc0); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2136 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2137 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2138 | goto drop; |
| 2139 | } |
| 2140 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 2141 | tc0->rtt_ts = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2142 | tcp_init_snd_vars (tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2143 | tcp_make_synack (new_tc0, b0); |
| 2144 | next0 = tcp_next_output (is_ip4); |
| 2145 | |
| 2146 | goto drop; |
| 2147 | } |
| 2148 | |
| 2149 | /* Read data, if any */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2150 | if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2151 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2152 | ASSERT (0); |
| 2153 | error0 = tcp_segment_rcv (tm, new_tc0, b0, &next0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2154 | if (error0 == TCP_ERROR_PURE_ACK) |
| 2155 | error0 = TCP_ERROR_SYN_ACKS_RCVD; |
| 2156 | } |
| 2157 | else |
| 2158 | { |
| 2159 | tcp_make_ack (new_tc0, b0); |
| 2160 | next0 = tcp_next_output (new_tc0->c_is_ip4); |
| 2161 | } |
| 2162 | |
| 2163 | drop: |
| 2164 | |
| 2165 | b0->error = error0 ? node->errors[error0] : 0; |
Chris Luke | 879ace3 | 2017-09-26 13:15:16 -0400 | [diff] [blame] | 2166 | if (PREDICT_FALSE |
| 2167 | ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2168 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2169 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2170 | clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header)); |
| 2171 | clib_memcpy (&t0->tcp_connection, tc0, |
| 2172 | sizeof (t0->tcp_connection)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2173 | } |
| 2174 | |
| 2175 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2176 | n_left_to_next, bi0, next0); |
| 2177 | } |
| 2178 | |
| 2179 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2180 | } |
| 2181 | |
| 2182 | errors = session_manager_flush_enqueue_events (my_thread_index); |
| 2183 | if (errors) |
| 2184 | { |
| 2185 | if (is_ip4) |
| 2186 | vlib_node_increment_counter (vm, tcp4_established_node.index, |
| 2187 | TCP_ERROR_EVENT_FIFO_FULL, errors); |
| 2188 | else |
| 2189 | vlib_node_increment_counter (vm, tcp6_established_node.index, |
| 2190 | TCP_ERROR_EVENT_FIFO_FULL, errors); |
| 2191 | } |
| 2192 | |
| 2193 | return from_frame->n_vectors; |
| 2194 | } |
| 2195 | |
| 2196 | static uword |
| 2197 | tcp4_syn_sent (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2198 | vlib_frame_t * from_frame) |
| 2199 | { |
| 2200 | return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2201 | } |
| 2202 | |
| 2203 | static uword |
| 2204 | tcp6_syn_sent_rcv (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2205 | vlib_frame_t * from_frame) |
| 2206 | { |
| 2207 | return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2208 | } |
| 2209 | |
| 2210 | /* *INDENT-OFF* */ |
| 2211 | VLIB_REGISTER_NODE (tcp4_syn_sent_node) = |
| 2212 | { |
| 2213 | .function = tcp4_syn_sent, |
| 2214 | .name = "tcp4-syn-sent", |
| 2215 | /* Takes a vector of packets. */ |
| 2216 | .vector_size = sizeof (u32), |
| 2217 | .n_errors = TCP_N_ERROR, |
| 2218 | .error_strings = tcp_error_strings, |
| 2219 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2220 | .next_nodes = |
| 2221 | { |
| 2222 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2223 | foreach_tcp_state_next |
| 2224 | #undef _ |
| 2225 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2226 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2227 | }; |
| 2228 | /* *INDENT-ON* */ |
| 2229 | |
| 2230 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_syn_sent_node, tcp4_syn_sent); |
| 2231 | |
| 2232 | /* *INDENT-OFF* */ |
| 2233 | VLIB_REGISTER_NODE (tcp6_syn_sent_node) = |
| 2234 | { |
| 2235 | .function = tcp6_syn_sent_rcv, |
| 2236 | .name = "tcp6-syn-sent", |
| 2237 | /* Takes a vector of packets. */ |
| 2238 | .vector_size = sizeof (u32), |
| 2239 | .n_errors = TCP_N_ERROR, |
| 2240 | .error_strings = tcp_error_strings, |
| 2241 | .n_next_nodes = TCP_SYN_SENT_N_NEXT, |
| 2242 | .next_nodes = |
| 2243 | { |
| 2244 | #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n, |
| 2245 | foreach_tcp_state_next |
| 2246 | #undef _ |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2247 | }, |
| 2248 | .format_trace = format_tcp_rx_trace_short, |
| 2249 | }; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2250 | /* *INDENT-ON* */ |
| 2251 | |
| 2252 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2253 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2254 | /** |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2255 | * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2256 | * as per RFC793 p. 64 |
| 2257 | */ |
| 2258 | always_inline uword |
| 2259 | tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2260 | vlib_frame_t * from_frame, int is_ip4) |
| 2261 | { |
| 2262 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 2263 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2264 | u32 my_thread_index = vm->thread_index, errors = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2265 | |
| 2266 | from = vlib_frame_vector_args (from_frame); |
| 2267 | n_left_from = from_frame->n_vectors; |
| 2268 | |
| 2269 | next_index = node->cached_next_index; |
| 2270 | |
| 2271 | while (n_left_from > 0) |
| 2272 | { |
| 2273 | u32 n_left_to_next; |
| 2274 | |
| 2275 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2276 | |
| 2277 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2278 | { |
| 2279 | u32 bi0; |
| 2280 | vlib_buffer_t *b0; |
| 2281 | tcp_header_t *tcp0 = 0; |
| 2282 | tcp_connection_t *tc0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2283 | u32 next0 = TCP_RCV_PROCESS_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2284 | u8 is_fin0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2285 | |
| 2286 | bi0 = from[0]; |
| 2287 | to_next[0] = bi0; |
| 2288 | from += 1; |
| 2289 | to_next += 1; |
| 2290 | n_left_from -= 1; |
| 2291 | n_left_to_next -= 1; |
| 2292 | |
| 2293 | b0 = vlib_get_buffer (vm, bi0); |
| 2294 | tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index, |
| 2295 | my_thread_index); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2296 | if (PREDICT_FALSE (tc0 == 0)) |
| 2297 | { |
| 2298 | error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2299 | goto drop; |
| 2300 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2301 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2302 | tcp0 = tcp_buffer_hdr (b0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2303 | is_fin0 = tcp_is_fin (tcp0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2304 | |
| 2305 | /* SYNs, FINs and data consume sequence numbers */ |
| 2306 | vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2307 | + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2308 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2309 | if (CLIB_DEBUG) |
| 2310 | { |
| 2311 | tcp_connection_t *tmp; |
| 2312 | tmp = tcp_lookup_connection (b0, my_thread_index, is_ip4); |
| 2313 | if (tmp->state != tc0->state) |
| 2314 | { |
| 2315 | clib_warning ("state changed"); |
| 2316 | ASSERT (0); |
| 2317 | goto drop; |
| 2318 | } |
| 2319 | } |
| 2320 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2321 | /* |
| 2322 | * Special treatment for CLOSED |
| 2323 | */ |
| 2324 | switch (tc0->state) |
| 2325 | { |
| 2326 | case TCP_STATE_CLOSED: |
| 2327 | goto drop; |
| 2328 | break; |
| 2329 | } |
| 2330 | |
| 2331 | /* |
| 2332 | * For all other states (except LISTEN) |
| 2333 | */ |
| 2334 | |
| 2335 | /* 1-4: check SEQ, RST, SYN */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2336 | if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0, |
| 2337 | &next0))) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2338 | { |
| 2339 | error0 = TCP_ERROR_SEGMENT_INVALID; |
| 2340 | goto drop; |
| 2341 | } |
| 2342 | |
| 2343 | /* 5: check the ACK field */ |
| 2344 | switch (tc0->state) |
| 2345 | { |
| 2346 | case TCP_STATE_SYN_RCVD: |
| 2347 | /* |
| 2348 | * If the segment acknowledgment is not acceptable, form a |
| 2349 | * reset segment, |
| 2350 | * <SEQ=SEG.ACK><CTL=RST> |
| 2351 | * and send it. |
| 2352 | */ |
| 2353 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
| 2354 | { |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2355 | TCP_DBG ("connection not accepted"); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 2356 | tcp_send_reset_w_pkt (tc0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2357 | goto drop; |
| 2358 | } |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 2359 | |
| 2360 | /* Update rtt and rto */ |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 2361 | tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number); |
| 2362 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2363 | /* Switch state to ESTABLISHED */ |
| 2364 | tc0->state = TCP_STATE_ESTABLISHED; |
| 2365 | |
| 2366 | /* Initialize session variables */ |
| 2367 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2368 | tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2369 | << tc0->rcv_opts.wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2370 | tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 2371 | tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2372 | stream_session_accept_notify (&tc0->connection); |
| 2373 | |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2374 | /* Reset SYN-ACK retransmit and SYN_RCV establish timers */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2375 | tcp_retransmit_timer_reset (tc0); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2376 | tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2377 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2378 | break; |
| 2379 | case TCP_STATE_ESTABLISHED: |
| 2380 | /* We can get packets in established state here because they |
| 2381 | * were enqueued before state change */ |
| 2382 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2383 | goto drop; |
| 2384 | |
| 2385 | break; |
| 2386 | case TCP_STATE_FIN_WAIT_1: |
| 2387 | /* In addition to the processing for the ESTABLISHED state, if |
| 2388 | * our FIN is now acknowledged then enter FIN-WAIT-2 and |
| 2389 | * continue processing in that state. */ |
| 2390 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2391 | goto drop; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2392 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2393 | /* Still have to send the FIN */ |
| 2394 | if (tc0->flags & TCP_CONN_FINPNDG) |
| 2395 | { |
| 2396 | /* TX fifo finally drained */ |
| 2397 | if (!stream_session_tx_fifo_max_dequeue (&tc0->connection)) |
| 2398 | tcp_send_fin (tc0); |
| 2399 | } |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2400 | /* If FIN is ACKed */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2401 | else if (tc0->snd_una == tc0->snd_una_max) |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2402 | { |
| 2403 | tc0->state = TCP_STATE_FIN_WAIT_2; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2404 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
| 2405 | |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2406 | /* Stop all retransmit timers because we have nothing more |
| 2407 | * to send. Enable waitclose though because we're willing to |
| 2408 | * wait for peer's FIN but not indefinitely. */ |
| 2409 | tcp_connection_timers_reset (tc0); |
| 2410 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2411 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2412 | break; |
| 2413 | case TCP_STATE_FIN_WAIT_2: |
| 2414 | /* In addition to the processing for the ESTABLISHED state, if |
| 2415 | * the retransmission queue is empty, the user's CLOSE can be |
| 2416 | * acknowledged ("ok") but do not delete the TCB. */ |
| 2417 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2418 | goto drop; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2419 | break; |
| 2420 | case TCP_STATE_CLOSE_WAIT: |
| 2421 | /* Do the same processing as for the ESTABLISHED state. */ |
| 2422 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2423 | goto drop; |
| 2424 | break; |
| 2425 | case TCP_STATE_CLOSING: |
| 2426 | /* In addition to the processing for the ESTABLISHED state, if |
| 2427 | * the ACK acknowledges our FIN then enter the TIME-WAIT state, |
| 2428 | * otherwise ignore the segment. */ |
| 2429 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2430 | goto drop; |
| 2431 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2432 | tc0->state = TCP_STATE_TIME_WAIT; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2433 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2434 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2435 | goto drop; |
| 2436 | |
| 2437 | break; |
| 2438 | case TCP_STATE_LAST_ACK: |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2439 | /* The only thing that [should] arrive in this state is an |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2440 | * acknowledgment of our FIN. If our FIN is now acknowledged, |
| 2441 | * delete the TCB, enter the CLOSED state, and return. */ |
| 2442 | |
| 2443 | if (!tcp_rcv_ack_is_acceptable (tc0, b0)) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2444 | { |
| 2445 | error0 = TCP_ERROR_ACK_INVALID; |
| 2446 | goto drop; |
| 2447 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2448 | |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2449 | tc0->snd_una = vnet_buffer (b0)->tcp.ack_number; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2450 | /* Apparently our ACK for the peer's FIN was lost */ |
| 2451 | if (is_fin0 && tc0->snd_una != tc0->snd_una_max) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2452 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2453 | tcp_send_fin (tc0); |
| 2454 | goto drop; |
| 2455 | } |
| 2456 | |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2457 | tc0->state = TCP_STATE_CLOSED; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2458 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2459 | tcp_connection_timers_reset (tc0); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2460 | |
| 2461 | /* Don't delete the connection/session yet. Instead, wait a |
| 2462 | * reasonable amount of time until the pipes are cleared. In |
| 2463 | * particular, this makes sure that we won't have dead sessions |
| 2464 | * when processing events on the tx path */ |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2465 | tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2466 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2467 | goto drop; |
| 2468 | |
| 2469 | break; |
| 2470 | case TCP_STATE_TIME_WAIT: |
| 2471 | /* The only thing that can arrive in this state is a |
| 2472 | * retransmission of the remote FIN. Acknowledge it, and restart |
| 2473 | * the 2 MSL timeout. */ |
| 2474 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2475 | if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0)) |
| 2476 | goto drop; |
| 2477 | |
| 2478 | tcp_make_ack (tc0, b0); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 2479 | next0 = tcp_next_output (is_ip4); |
| 2480 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2481 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2482 | goto drop; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2483 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2484 | break; |
| 2485 | default: |
| 2486 | ASSERT (0); |
| 2487 | } |
| 2488 | |
| 2489 | /* 6: check the URG bit TODO */ |
| 2490 | |
| 2491 | /* 7: process the segment text */ |
| 2492 | switch (tc0->state) |
| 2493 | { |
| 2494 | case TCP_STATE_ESTABLISHED: |
| 2495 | case TCP_STATE_FIN_WAIT_1: |
| 2496 | case TCP_STATE_FIN_WAIT_2: |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2497 | if (vnet_buffer (b0)->tcp.data_len) |
| 2498 | error0 = tcp_segment_rcv (tm, tc0, b0, &next0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2499 | else if (is_fin0) |
| 2500 | tc0->rcv_nxt += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2501 | break; |
| 2502 | case TCP_STATE_CLOSE_WAIT: |
| 2503 | case TCP_STATE_CLOSING: |
| 2504 | case TCP_STATE_LAST_ACK: |
| 2505 | case TCP_STATE_TIME_WAIT: |
| 2506 | /* This should not occur, since a FIN has been received from the |
| 2507 | * remote side. Ignore the segment text. */ |
| 2508 | break; |
| 2509 | } |
| 2510 | |
| 2511 | /* 8: check the FIN bit */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2512 | if (!is_fin0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2513 | goto drop; |
| 2514 | |
| 2515 | switch (tc0->state) |
| 2516 | { |
| 2517 | case TCP_STATE_ESTABLISHED: |
| 2518 | case TCP_STATE_SYN_RCVD: |
| 2519 | /* Send FIN-ACK notify app and enter CLOSE-WAIT */ |
| 2520 | tcp_connection_timers_reset (tc0); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2521 | tcp_make_fin (tc0, b0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2522 | tc0->snd_nxt += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2523 | next0 = tcp_next_output (tc0->c_is_ip4); |
| 2524 | stream_session_disconnect_notify (&tc0->connection); |
| 2525 | tc0->state = TCP_STATE_CLOSE_WAIT; |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2526 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2527 | break; |
| 2528 | case TCP_STATE_CLOSE_WAIT: |
| 2529 | case TCP_STATE_CLOSING: |
| 2530 | case TCP_STATE_LAST_ACK: |
| 2531 | /* move along .. */ |
| 2532 | break; |
| 2533 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2534 | tc0->state = TCP_STATE_CLOSING; |
| 2535 | tcp_make_ack (tc0, b0); |
| 2536 | next0 = tcp_next_output (is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2537 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2538 | /* Wait for ACK but not forever */ |
| 2539 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2540 | break; |
| 2541 | case TCP_STATE_FIN_WAIT_2: |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2542 | /* Got FIN, send ACK! Be more aggressive with resource cleanup */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2543 | tc0->state = TCP_STATE_TIME_WAIT; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 2544 | tcp_connection_timers_reset (tc0); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2545 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2546 | tcp_make_ack (tc0, b0); |
| 2547 | next0 = tcp_next_output (is_ip4); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2548 | TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2549 | break; |
| 2550 | case TCP_STATE_TIME_WAIT: |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2551 | /* Remain in the TIME-WAIT state. Restart the time-wait |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2552 | * timeout. |
| 2553 | */ |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 2554 | tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2555 | break; |
| 2556 | } |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2557 | TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2558 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2559 | drop: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2560 | b0->error = error0 ? node->errors[error0] : 0; |
| 2561 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2562 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2563 | { |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2564 | tcp_rx_trace_t *t0 = |
| 2565 | vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2566 | tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2567 | } |
| 2568 | |
| 2569 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2570 | n_left_to_next, bi0, next0); |
| 2571 | } |
| 2572 | |
| 2573 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2574 | } |
| 2575 | |
| 2576 | errors = session_manager_flush_enqueue_events (my_thread_index); |
| 2577 | if (errors) |
| 2578 | { |
| 2579 | if (is_ip4) |
| 2580 | vlib_node_increment_counter (vm, tcp4_established_node.index, |
| 2581 | TCP_ERROR_EVENT_FIFO_FULL, errors); |
| 2582 | else |
| 2583 | vlib_node_increment_counter (vm, tcp6_established_node.index, |
| 2584 | TCP_ERROR_EVENT_FIFO_FULL, errors); |
| 2585 | } |
| 2586 | |
| 2587 | return from_frame->n_vectors; |
| 2588 | } |
| 2589 | |
| 2590 | static uword |
| 2591 | tcp4_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2592 | vlib_frame_t * from_frame) |
| 2593 | { |
| 2594 | return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2595 | } |
| 2596 | |
| 2597 | static uword |
| 2598 | tcp6_rcv_process (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2599 | vlib_frame_t * from_frame) |
| 2600 | { |
| 2601 | return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2602 | } |
| 2603 | |
| 2604 | /* *INDENT-OFF* */ |
| 2605 | VLIB_REGISTER_NODE (tcp4_rcv_process_node) = |
| 2606 | { |
| 2607 | .function = tcp4_rcv_process, |
| 2608 | .name = "tcp4-rcv-process", |
| 2609 | /* Takes a vector of packets. */ |
| 2610 | .vector_size = sizeof (u32), |
| 2611 | .n_errors = TCP_N_ERROR, |
| 2612 | .error_strings = tcp_error_strings, |
| 2613 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2614 | .next_nodes = |
| 2615 | { |
| 2616 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2617 | foreach_tcp_state_next |
| 2618 | #undef _ |
| 2619 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2620 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2621 | }; |
| 2622 | /* *INDENT-ON* */ |
| 2623 | |
| 2624 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_rcv_process_node, tcp4_rcv_process); |
| 2625 | |
| 2626 | /* *INDENT-OFF* */ |
| 2627 | VLIB_REGISTER_NODE (tcp6_rcv_process_node) = |
| 2628 | { |
| 2629 | .function = tcp6_rcv_process, |
| 2630 | .name = "tcp6-rcv-process", |
| 2631 | /* Takes a vector of packets. */ |
| 2632 | .vector_size = sizeof (u32), |
| 2633 | .n_errors = TCP_N_ERROR, |
| 2634 | .error_strings = tcp_error_strings, |
| 2635 | .n_next_nodes = TCP_RCV_PROCESS_N_NEXT, |
| 2636 | .next_nodes = |
| 2637 | { |
| 2638 | #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n, |
| 2639 | foreach_tcp_state_next |
| 2640 | #undef _ |
| 2641 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2642 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2643 | }; |
| 2644 | /* *INDENT-ON* */ |
| 2645 | |
| 2646 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_rcv_process_node, tcp6_rcv_process); |
| 2647 | |
| 2648 | vlib_node_registration_t tcp4_listen_node; |
| 2649 | vlib_node_registration_t tcp6_listen_node; |
| 2650 | |
| 2651 | /** |
| 2652 | * LISTEN state processing as per RFC 793 p. 65 |
| 2653 | */ |
| 2654 | always_inline uword |
| 2655 | tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2656 | vlib_frame_t * from_frame, int is_ip4) |
| 2657 | { |
| 2658 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2659 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2660 | u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP; |
| 2661 | |
| 2662 | from = vlib_frame_vector_args (from_frame); |
| 2663 | n_left_from = from_frame->n_vectors; |
| 2664 | |
| 2665 | next_index = node->cached_next_index; |
| 2666 | |
| 2667 | while (n_left_from > 0) |
| 2668 | { |
| 2669 | u32 n_left_to_next; |
| 2670 | |
| 2671 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2672 | |
| 2673 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2674 | { |
| 2675 | u32 bi0; |
| 2676 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2677 | tcp_rx_trace_t *t0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2678 | tcp_header_t *th0 = 0; |
| 2679 | tcp_connection_t *lc0; |
| 2680 | ip4_header_t *ip40; |
| 2681 | ip6_header_t *ip60; |
| 2682 | tcp_connection_t *child0; |
| 2683 | u32 error0 = TCP_ERROR_SYNS_RCVD, next0 = TCP_LISTEN_NEXT_DROP; |
| 2684 | |
| 2685 | bi0 = from[0]; |
| 2686 | to_next[0] = bi0; |
| 2687 | from += 1; |
| 2688 | to_next += 1; |
| 2689 | n_left_from -= 1; |
| 2690 | n_left_to_next -= 1; |
| 2691 | |
| 2692 | b0 = vlib_get_buffer (vm, bi0); |
| 2693 | lc0 = tcp_listener_get (vnet_buffer (b0)->tcp.connection_index); |
| 2694 | |
| 2695 | if (is_ip4) |
| 2696 | { |
| 2697 | ip40 = vlib_buffer_get_current (b0); |
| 2698 | th0 = ip4_next_header (ip40); |
| 2699 | } |
| 2700 | else |
| 2701 | { |
| 2702 | ip60 = vlib_buffer_get_current (b0); |
| 2703 | th0 = ip6_next_header (ip60); |
| 2704 | } |
| 2705 | |
| 2706 | /* Create child session. For syn-flood protection use filter */ |
| 2707 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 2708 | /* 1. first check for an RST: handled in dispatch */ |
| 2709 | /* if (tcp_rst (th0)) |
| 2710 | goto drop; */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2711 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 2712 | /* 2. second check for an ACK: handled in dispatch */ |
| 2713 | /* if (tcp_ack (th0)) |
| 2714 | { |
| 2715 | tcp_send_reset (b0, is_ip4); |
| 2716 | goto drop; |
| 2717 | } */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2718 | |
| 2719 | /* 3. check for a SYN (did that already) */ |
| 2720 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2721 | /* Make sure connection wasn't just created */ |
| 2722 | child0 = tcp_lookup_connection (b0, my_thread_index, is_ip4); |
| 2723 | if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN)) |
| 2724 | { |
| 2725 | error0 = TCP_ERROR_CREATE_EXISTS; |
| 2726 | goto drop; |
| 2727 | } |
| 2728 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2729 | /* Create child session and send SYN-ACK */ |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2730 | child0 = tcp_connection_new (my_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2731 | child0->c_lcl_port = lc0->c_lcl_port; |
| 2732 | child0->c_rmt_port = th0->src_port; |
| 2733 | child0->c_is_ip4 = is_ip4; |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 2734 | child0->state = TCP_STATE_SYN_RCVD; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2735 | |
| 2736 | if (is_ip4) |
| 2737 | { |
| 2738 | child0->c_lcl_ip4.as_u32 = ip40->dst_address.as_u32; |
| 2739 | child0->c_rmt_ip4.as_u32 = ip40->src_address.as_u32; |
| 2740 | } |
| 2741 | else |
| 2742 | { |
| 2743 | clib_memcpy (&child0->c_lcl_ip6, &ip60->dst_address, |
| 2744 | sizeof (ip6_address_t)); |
| 2745 | clib_memcpy (&child0->c_rmt_ip6, &ip60->src_address, |
| 2746 | sizeof (ip6_address_t)); |
| 2747 | } |
| 2748 | |
| 2749 | if (stream_session_accept (&child0->connection, lc0->c_s_index, sst, |
| 2750 | 0 /* notify */ )) |
| 2751 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2752 | clib_warning ("session accept fail"); |
| 2753 | tcp_connection_cleanup (child0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2754 | error0 = TCP_ERROR_CREATE_SESSION_FAIL; |
| 2755 | goto drop; |
| 2756 | } |
| 2757 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2758 | if (tcp_options_parse (th0, &child0->rcv_opts)) |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 2759 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2760 | clib_warning ("options parse fail"); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 2761 | goto drop; |
| 2762 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2763 | |
| 2764 | child0->irs = vnet_buffer (b0)->tcp.seq_number; |
| 2765 | child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 2766 | child0->rcv_las = child0->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2767 | |
| 2768 | /* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK} |
| 2769 | * segments are used to initialize PAWS. */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2770 | if (tcp_opts_tstamp (&child0->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2771 | { |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2772 | child0->tsval_recent = child0->rcv_opts.tsval; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2773 | child0->tsval_recent_age = tcp_time_now (); |
| 2774 | } |
| 2775 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2776 | if (tcp_opts_wscale (&child0->rcv_opts)) |
| 2777 | child0->snd_wscale = child0->rcv_opts.wscale; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2778 | |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 2779 | child0->snd_wnd = clib_net_to_host_u16 (th0->window) |
| 2780 | << child0->snd_wscale; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2781 | child0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number; |
| 2782 | child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number; |
| 2783 | |
| 2784 | tcp_connection_init_vars (child0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2785 | TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1); |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2786 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2787 | /* Reuse buffer to make syn-ack and send */ |
| 2788 | tcp_make_synack (child0, b0); |
| 2789 | next0 = tcp_next_output (is_ip4); |
Florin Coras | ab0289a | 2017-08-14 11:25:25 -0700 | [diff] [blame] | 2790 | tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2791 | |
| 2792 | drop: |
| 2793 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2794 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2795 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2796 | clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
| 2797 | clib_memcpy (&t0->tcp_connection, lc0, |
| 2798 | sizeof (t0->tcp_connection)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2799 | } |
| 2800 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 2801 | b0->error = node->errors[error0]; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2802 | |
| 2803 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2804 | n_left_to_next, bi0, next0); |
| 2805 | } |
| 2806 | |
| 2807 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2808 | } |
| 2809 | return from_frame->n_vectors; |
| 2810 | } |
| 2811 | |
| 2812 | static uword |
| 2813 | tcp4_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2814 | vlib_frame_t * from_frame) |
| 2815 | { |
| 2816 | return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2817 | } |
| 2818 | |
| 2819 | static uword |
| 2820 | tcp6_listen (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2821 | vlib_frame_t * from_frame) |
| 2822 | { |
| 2823 | return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2824 | } |
| 2825 | |
| 2826 | /* *INDENT-OFF* */ |
| 2827 | VLIB_REGISTER_NODE (tcp4_listen_node) = |
| 2828 | { |
| 2829 | .function = tcp4_listen, |
| 2830 | .name = "tcp4-listen", |
| 2831 | /* Takes a vector of packets. */ |
| 2832 | .vector_size = sizeof (u32), |
| 2833 | .n_errors = TCP_N_ERROR, |
| 2834 | .error_strings = tcp_error_strings, |
| 2835 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 2836 | .next_nodes = |
| 2837 | { |
| 2838 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 2839 | foreach_tcp_state_next |
| 2840 | #undef _ |
| 2841 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2842 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2843 | }; |
| 2844 | /* *INDENT-ON* */ |
| 2845 | |
| 2846 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_listen_node, tcp4_listen); |
| 2847 | |
| 2848 | /* *INDENT-OFF* */ |
| 2849 | VLIB_REGISTER_NODE (tcp6_listen_node) = |
| 2850 | { |
| 2851 | .function = tcp6_listen, |
| 2852 | .name = "tcp6-listen", |
| 2853 | /* Takes a vector of packets. */ |
| 2854 | .vector_size = sizeof (u32), |
| 2855 | .n_errors = TCP_N_ERROR, |
| 2856 | .error_strings = tcp_error_strings, |
| 2857 | .n_next_nodes = TCP_LISTEN_N_NEXT, |
| 2858 | .next_nodes = |
| 2859 | { |
| 2860 | #define _(s,n) [TCP_LISTEN_NEXT_##s] = n, |
| 2861 | foreach_tcp_state_next |
| 2862 | #undef _ |
| 2863 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2864 | .format_trace = format_tcp_rx_trace_short, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2865 | }; |
| 2866 | /* *INDENT-ON* */ |
| 2867 | |
| 2868 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_listen_node, tcp6_listen); |
| 2869 | |
| 2870 | vlib_node_registration_t tcp4_input_node; |
| 2871 | vlib_node_registration_t tcp6_input_node; |
| 2872 | |
| 2873 | typedef enum _tcp_input_next |
| 2874 | { |
| 2875 | TCP_INPUT_NEXT_DROP, |
| 2876 | TCP_INPUT_NEXT_LISTEN, |
| 2877 | TCP_INPUT_NEXT_RCV_PROCESS, |
| 2878 | TCP_INPUT_NEXT_SYN_SENT, |
| 2879 | TCP_INPUT_NEXT_ESTABLISHED, |
| 2880 | TCP_INPUT_NEXT_RESET, |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2881 | TCP_INPUT_NEXT_PUNT, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2882 | TCP_INPUT_N_NEXT |
| 2883 | } tcp_input_next_t; |
| 2884 | |
| 2885 | #define foreach_tcp4_input_next \ |
| 2886 | _ (DROP, "error-drop") \ |
| 2887 | _ (LISTEN, "tcp4-listen") \ |
| 2888 | _ (RCV_PROCESS, "tcp4-rcv-process") \ |
| 2889 | _ (SYN_SENT, "tcp4-syn-sent") \ |
| 2890 | _ (ESTABLISHED, "tcp4-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2891 | _ (RESET, "tcp4-reset") \ |
| 2892 | _ (PUNT, "error-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2893 | |
| 2894 | #define foreach_tcp6_input_next \ |
| 2895 | _ (DROP, "error-drop") \ |
| 2896 | _ (LISTEN, "tcp6-listen") \ |
| 2897 | _ (RCV_PROCESS, "tcp6-rcv-process") \ |
| 2898 | _ (SYN_SENT, "tcp6-syn-sent") \ |
| 2899 | _ (ESTABLISHED, "tcp6-established") \ |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 2900 | _ (RESET, "tcp6-reset") \ |
| 2901 | _ (PUNT, "error-punt") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2902 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2903 | #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN) |
| 2904 | |
| 2905 | always_inline uword |
| 2906 | tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2907 | vlib_frame_t * from_frame, int is_ip4) |
| 2908 | { |
| 2909 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2910 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2911 | tcp_main_t *tm = vnet_get_tcp_main (); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2912 | |
| 2913 | from = vlib_frame_vector_args (from_frame); |
| 2914 | n_left_from = from_frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2915 | next_index = node->cached_next_index; |
Florin Coras | 82d3ec8 | 2017-08-14 08:10:42 -0700 | [diff] [blame] | 2916 | tcp_set_time_now (my_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2917 | |
| 2918 | while (n_left_from > 0) |
| 2919 | { |
| 2920 | u32 n_left_to_next; |
| 2921 | |
| 2922 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2923 | |
| 2924 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2925 | { |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2926 | int n_advance_bytes0, n_data_bytes0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2927 | u32 bi0; |
| 2928 | vlib_buffer_t *b0; |
| 2929 | tcp_header_t *tcp0 = 0; |
| 2930 | tcp_connection_t *tc0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2931 | transport_connection_t *tconn; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2932 | ip4_header_t *ip40; |
| 2933 | ip6_header_t *ip60; |
| 2934 | u32 error0 = TCP_ERROR_NO_LISTENER, next0 = TCP_INPUT_NEXT_DROP; |
| 2935 | u8 flags0; |
| 2936 | |
| 2937 | bi0 = from[0]; |
| 2938 | to_next[0] = bi0; |
| 2939 | from += 1; |
| 2940 | to_next += 1; |
| 2941 | n_left_from -= 1; |
| 2942 | n_left_to_next -= 1; |
| 2943 | |
| 2944 | b0 = vlib_get_buffer (vm, bi0); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 2945 | vnet_buffer (b0)->tcp.flags = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2946 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2947 | /* Checksum computed by ipx_local no need to compute again */ |
| 2948 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2949 | if (is_ip4) |
| 2950 | { |
| 2951 | ip40 = vlib_buffer_get_current (b0); |
| 2952 | tcp0 = ip4_next_header (ip40); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2953 | n_advance_bytes0 = (ip4_header_bytes (ip40) |
| 2954 | + tcp_header_bytes (tcp0)); |
| 2955 | n_data_bytes0 = clib_net_to_host_u16 (ip40->length) |
| 2956 | - n_advance_bytes0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2957 | tconn = stream_session_lookup_transport_wt4 (&ip40->dst_address, |
| 2958 | &ip40->src_address, |
| 2959 | tcp0->dst_port, |
| 2960 | tcp0->src_port, |
| 2961 | SESSION_TYPE_IP4_TCP, |
| 2962 | my_thread_index); |
| 2963 | tc0 = tcp_get_connection_from_transport (tconn); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2964 | ASSERT (tcp_lookup_is_valid (tc0, tcp0)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2965 | } |
| 2966 | else |
| 2967 | { |
| 2968 | ip60 = vlib_buffer_get_current (b0); |
| 2969 | tcp0 = ip6_next_header (ip60); |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2970 | n_advance_bytes0 = tcp_header_bytes (tcp0); |
| 2971 | n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length) |
| 2972 | - n_advance_bytes0; |
| 2973 | n_advance_bytes0 += sizeof (ip60[0]); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 2974 | tconn = stream_session_lookup_transport_wt6 (&ip60->dst_address, |
| 2975 | &ip60->src_address, |
| 2976 | tcp0->dst_port, |
| 2977 | tcp0->src_port, |
| 2978 | SESSION_TYPE_IP6_TCP, |
| 2979 | my_thread_index); |
| 2980 | tc0 = tcp_get_connection_from_transport (tconn); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 2981 | ASSERT (tcp_lookup_is_valid (tc0, tcp0)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2982 | } |
| 2983 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 2984 | /* Length check */ |
| 2985 | if (PREDICT_FALSE (n_advance_bytes0 < 0)) |
| 2986 | { |
| 2987 | error0 = TCP_ERROR_LENGTH; |
| 2988 | goto done; |
| 2989 | } |
| 2990 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2991 | /* Session exists */ |
| 2992 | if (PREDICT_TRUE (0 != tc0)) |
| 2993 | { |
| 2994 | /* Save connection index */ |
| 2995 | vnet_buffer (b0)->tcp.connection_index = tc0->c_c_index; |
| 2996 | vnet_buffer (b0)->tcp.seq_number = |
| 2997 | clib_net_to_host_u32 (tcp0->seq_number); |
| 2998 | vnet_buffer (b0)->tcp.ack_number = |
| 2999 | clib_net_to_host_u32 (tcp0->ack_number); |
| 3000 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 3001 | vnet_buffer (b0)->tcp.hdr_offset = (u8 *) tcp0 |
| 3002 | - (u8 *) vlib_buffer_get_current (b0); |
| 3003 | vnet_buffer (b0)->tcp.data_offset = n_advance_bytes0; |
| 3004 | vnet_buffer (b0)->tcp.data_len = n_data_bytes0; |
| 3005 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3006 | flags0 = tcp0->flags & filter_flags; |
| 3007 | next0 = tm->dispatch_table[tc0->state][flags0].next; |
| 3008 | error0 = tm->dispatch_table[tc0->state][flags0].error; |
| 3009 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3010 | if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH |
| 3011 | || next0 == TCP_INPUT_NEXT_RESET)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3012 | { |
| 3013 | /* Overload tcp flags to store state */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3014 | tcp_state_t state0 = tc0->state; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3015 | vnet_buffer (b0)->tcp.flags = tc0->state; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3016 | |
| 3017 | if (error0 == TCP_ERROR_DISPATCH) |
| 3018 | clib_warning ("disp error state %U flags %U", |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 3019 | format_tcp_state, state0, format_tcp_flags, |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3020 | (int) flags0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3021 | } |
| 3022 | } |
| 3023 | else |
| 3024 | { |
Pierre Pfister | 7fe51f3 | 2017-09-20 08:48:36 +0200 | [diff] [blame] | 3025 | if ((is_ip4 && tm->punt_unknown4) || |
| 3026 | (!is_ip4 && tm->punt_unknown6)) |
| 3027 | { |
| 3028 | next0 = TCP_INPUT_NEXT_PUNT; |
| 3029 | error0 = TCP_ERROR_PUNT; |
| 3030 | } |
| 3031 | else |
| 3032 | { |
| 3033 | /* Send reset */ |
| 3034 | next0 = TCP_INPUT_NEXT_RESET; |
| 3035 | error0 = TCP_ERROR_NO_LISTENER; |
| 3036 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3037 | } |
| 3038 | |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 3039 | done: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3040 | b0->error = error0 ? node->errors[error0] : 0; |
| 3041 | |
| 3042 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 3043 | { |
Florin Coras | 82b13a8 | 2017-04-25 11:58:06 -0700 | [diff] [blame] | 3044 | tcp_rx_trace_t *t0 = |
| 3045 | vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 3046 | tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3047 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3048 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 3049 | n_left_to_next, bi0, next0); |
| 3050 | } |
| 3051 | |
| 3052 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 3053 | } |
| 3054 | |
| 3055 | return from_frame->n_vectors; |
| 3056 | } |
| 3057 | |
| 3058 | static uword |
| 3059 | tcp4_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3060 | vlib_frame_t * from_frame) |
| 3061 | { |
| 3062 | return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 3063 | } |
| 3064 | |
| 3065 | static uword |
| 3066 | tcp6_input (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 3067 | vlib_frame_t * from_frame) |
| 3068 | { |
| 3069 | return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 3070 | } |
| 3071 | |
| 3072 | /* *INDENT-OFF* */ |
| 3073 | VLIB_REGISTER_NODE (tcp4_input_node) = |
| 3074 | { |
| 3075 | .function = tcp4_input, |
| 3076 | .name = "tcp4-input", |
| 3077 | /* Takes a vector of packets. */ |
| 3078 | .vector_size = sizeof (u32), |
| 3079 | .n_errors = TCP_N_ERROR, |
| 3080 | .error_strings = tcp_error_strings, |
| 3081 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3082 | .next_nodes = |
| 3083 | { |
| 3084 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3085 | foreach_tcp4_input_next |
| 3086 | #undef _ |
| 3087 | }, |
| 3088 | .format_buffer = format_tcp_header, |
| 3089 | .format_trace = format_tcp_rx_trace, |
| 3090 | }; |
| 3091 | /* *INDENT-ON* */ |
| 3092 | |
| 3093 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_input_node, tcp4_input); |
| 3094 | |
| 3095 | /* *INDENT-OFF* */ |
| 3096 | VLIB_REGISTER_NODE (tcp6_input_node) = |
| 3097 | { |
| 3098 | .function = tcp6_input, |
| 3099 | .name = "tcp6-input", |
| 3100 | /* Takes a vector of packets. */ |
| 3101 | .vector_size = sizeof (u32), |
| 3102 | .n_errors = TCP_N_ERROR, |
| 3103 | .error_strings = tcp_error_strings, |
| 3104 | .n_next_nodes = TCP_INPUT_N_NEXT, |
| 3105 | .next_nodes = |
| 3106 | { |
| 3107 | #define _(s,n) [TCP_INPUT_NEXT_##s] = n, |
| 3108 | foreach_tcp6_input_next |
| 3109 | #undef _ |
| 3110 | }, |
| 3111 | .format_buffer = format_tcp_header, |
| 3112 | .format_trace = format_tcp_rx_trace, |
| 3113 | }; |
| 3114 | /* *INDENT-ON* */ |
| 3115 | |
| 3116 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_input_node, tcp6_input); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3117 | |
| 3118 | static void |
| 3119 | tcp_dispatch_table_init (tcp_main_t * tm) |
| 3120 | { |
| 3121 | int i, j; |
| 3122 | for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++) |
| 3123 | for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++) |
| 3124 | { |
| 3125 | tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP; |
| 3126 | tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH; |
| 3127 | } |
| 3128 | |
| 3129 | #define _(t,f,n,e) \ |
| 3130 | do { \ |
| 3131 | tm->dispatch_table[TCP_STATE_##t][f].next = (n); \ |
| 3132 | tm->dispatch_table[TCP_STATE_##t][f].error = (e); \ |
| 3133 | } while (0) |
| 3134 | |
| 3135 | /* SYNs for new connections -> tcp-listen. */ |
| 3136 | _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3137 | _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_NONE); |
| 3138 | _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3139 | _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, |
| 3140 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3141 | /* ACK for for a SYN-ACK -> tcp-rcv-process. */ |
| 3142 | _(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] | 3143 | _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3144 | _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3145 | /* SYN-ACK for a SYN */ |
| 3146 | _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3147 | TCP_ERROR_NONE); |
| 3148 | _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3149 | _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE); |
| 3150 | _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, |
| 3151 | TCP_ERROR_NONE); |
| 3152 | /* ACK for for established connection -> tcp-established. */ |
| 3153 | _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3154 | /* FIN for for established connection -> tcp-established. */ |
| 3155 | _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
| 3156 | _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3157 | TCP_ERROR_NONE); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 3158 | _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3159 | _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3160 | TCP_ERROR_NONE); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3161 | _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3162 | _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, |
| 3163 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3164 | /* ACK or FIN-ACK to our FIN */ |
| 3165 | _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3166 | _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3167 | TCP_ERROR_NONE); |
| 3168 | /* FIN in reply to our FIN from the other side */ |
| 3169 | _(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] | 3170 | _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3171 | /* FIN confirming that the peer (app) has closed */ |
| 3172 | _(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] | 3173 | _(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] | 3174 | _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3175 | TCP_ERROR_NONE); |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 3176 | _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3177 | _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3178 | TCP_ERROR_NONE); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3179 | _(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] | 3180 | _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3181 | _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3182 | TCP_ERROR_NONE); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 3183 | _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 3184 | _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE); |
| 3185 | _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, |
| 3186 | TCP_ERROR_NONE); |
Florin Coras | 3eb5062 | 2017-07-13 01:24:57 -0400 | [diff] [blame] | 3187 | _(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] | 3188 | _(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] | 3189 | _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 3190 | _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 3191 | _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 3192 | TCP_ERROR_CONNECTION_CLOSED); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3193 | #undef _ |
| 3194 | } |
| 3195 | |
| 3196 | clib_error_t * |
| 3197 | tcp_input_init (vlib_main_t * vm) |
| 3198 | { |
| 3199 | clib_error_t *error = 0; |
| 3200 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 3201 | |
| 3202 | if ((error = vlib_call_init_function (vm, tcp_init))) |
| 3203 | return error; |
| 3204 | |
| 3205 | /* Initialize dispatch table. */ |
| 3206 | tcp_dispatch_table_init (tm); |
| 3207 | |
| 3208 | return error; |
| 3209 | } |
| 3210 | |
| 3211 | VLIB_INIT_FUNCTION (tcp_input_init); |
| 3212 | |
| 3213 | /* |
| 3214 | * fd.io coding-style-patch-verification: ON |
| 3215 | * |
| 3216 | * Local Variables: |
| 3217 | * eval: (c-set-style "gnu") |
| 3218 | * End: |
| 3219 | */ |