Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1 | /* |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 2 | * Copyright (c) 2016-2019 Cisco and/or its affiliates. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | * you may not use this file except in compliance with the License. |
| 5 | * You may obtain a copy of the License at: |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software |
| 10 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | * See the License for the specific language governing permissions and |
| 13 | * limitations under the License. |
| 14 | */ |
| 15 | |
| 16 | #include <vnet/tcp/tcp.h> |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 17 | #include <math.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 18 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 19 | typedef enum _tcp_output_next |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 20 | { |
| 21 | TCP_OUTPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 22 | TCP_OUTPUT_NEXT_IP_LOOKUP, |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 23 | TCP_OUTPUT_NEXT_IP_REWRITE, |
| 24 | TCP_OUTPUT_NEXT_IP_ARP, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 25 | TCP_OUTPUT_N_NEXT |
| 26 | } tcp_output_next_t; |
| 27 | |
| 28 | #define foreach_tcp4_output_next \ |
| 29 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 30 | _ (IP_LOOKUP, "ip4-lookup") \ |
| 31 | _ (IP_REWRITE, "ip4-rewrite") \ |
| 32 | _ (IP_ARP, "ip4-arp") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 33 | |
| 34 | #define foreach_tcp6_output_next \ |
| 35 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 36 | _ (IP_LOOKUP, "ip6-lookup") \ |
| 37 | _ (IP_REWRITE, "ip6-rewrite") \ |
| 38 | _ (IP_ARP, "ip6-discover-neighbor") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 39 | |
| 40 | static char *tcp_error_strings[] = { |
| 41 | #define tcp_error(n,s) s, |
| 42 | #include <vnet/tcp/tcp_error.def> |
| 43 | #undef tcp_error |
| 44 | }; |
| 45 | |
| 46 | typedef struct |
| 47 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 48 | tcp_header_t tcp_header; |
| 49 | tcp_connection_t tcp_connection; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 50 | } tcp_tx_trace_t; |
| 51 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 52 | static u8 * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 53 | format_tcp_tx_trace (u8 * s, va_list * args) |
| 54 | { |
| 55 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 56 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 57 | tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *); |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 58 | u32 indent = format_get_indent (s); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 59 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 60 | s = format (s, "%U\n%U%U", |
| 61 | format_tcp_header, &t->tcp_header, 128, |
| 62 | format_white_space, indent, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 63 | format_tcp_connection, &t->tcp_connection, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 64 | |
| 65 | return s; |
| 66 | } |
| 67 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 68 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 69 | static u8 |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 70 | tcp_window_compute_scale (u32 window) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 71 | { |
| 72 | u8 wnd_scale = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 73 | while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 74 | wnd_scale++; |
| 75 | return wnd_scale; |
| 76 | } |
| 77 | |
| 78 | /** |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 79 | * TCP's initial window |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 80 | */ |
| 81 | always_inline u32 |
| 82 | tcp_initial_wnd_unscaled (tcp_connection_t * tc) |
| 83 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 84 | /* RFC 6928 recommends the value lower. However at the time our connections |
| 85 | * are initialized, fifos may not be allocated. Therefore, advertise the |
| 86 | * smallest possible unscaled window size and update once fifos are |
| 87 | * assigned to the session. |
| 88 | */ |
| 89 | /* |
| 90 | tcp_update_rcv_mss (tc); |
| 91 | TCP_IW_N_SEGMENTS * tc->mss; |
| 92 | */ |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 93 | return tcp_cfg.min_rx_fifo; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 97 | * Compute initial window and scale factor. As per RFC1323, window field in |
| 98 | * SYN and SYN-ACK segments is never scaled. |
| 99 | */ |
| 100 | u32 |
| 101 | tcp_initial_window_to_advertise (tcp_connection_t * tc) |
| 102 | { |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 103 | /* Compute rcv wscale only if peer advertised support for it */ |
| 104 | if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts)) |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 105 | tc->rcv_wscale = tcp_window_compute_scale (tcp_cfg.max_rx_fifo); |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 106 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 107 | tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 108 | |
| 109 | return clib_min (tc->rcv_wnd, TCP_WND_MAX); |
| 110 | } |
| 111 | |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 112 | static inline void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 113 | tcp_update_rcv_wnd (tcp_connection_t * tc) |
| 114 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 115 | u32 available_space, wnd; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 116 | i32 observed_wnd; |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 117 | |
| 118 | ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection)); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 119 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 120 | /* |
| 121 | * Figure out how much space we have available |
| 122 | */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 123 | available_space = transport_max_rx_enqueue (&tc->connection); |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 124 | if (PREDICT_FALSE (available_space < tc->rcv_opts.mss)) |
Florin Coras | 182d219 | 2019-07-24 10:27:20 -0700 | [diff] [blame] | 125 | { |
| 126 | tc->rcv_wnd = 0; |
| 127 | return; |
| 128 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 129 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 130 | /* |
| 131 | * Use the above and what we know about what we've previously advertised |
| 132 | * to compute the new window |
| 133 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 134 | observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 135 | |
| 136 | /* Bad. Thou shalt not shrink */ |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 137 | if (PREDICT_FALSE ((i32) available_space < observed_wnd)) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 138 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 139 | wnd = clib_max (observed_wnd, 0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 140 | TCP_EVT (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 141 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 142 | else |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 143 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 144 | wnd = available_space; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 145 | } |
| 146 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 147 | /* Make sure we have a multiple of rcv_wscale */ |
| 148 | if (wnd && tc->rcv_wscale) |
| 149 | { |
Florin Coras | 679b78f | 2019-03-06 21:16:26 -0800 | [diff] [blame] | 150 | wnd &= ~((1 << tc->rcv_wscale) - 1); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 151 | if (wnd == 0) |
| 152 | wnd = 1 << tc->rcv_wscale; |
| 153 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 154 | |
| 155 | tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | /** |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 159 | * Compute and return window to advertise, scaled as per RFC1323 |
| 160 | */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 161 | static inline u32 |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 162 | tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) |
| 163 | { |
| 164 | if (state < TCP_STATE_ESTABLISHED) |
| 165 | return tcp_initial_window_to_advertise (tc); |
| 166 | |
| 167 | tcp_update_rcv_wnd (tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 168 | return tc->rcv_wnd >> tc->rcv_wscale; |
| 169 | } |
| 170 | |
| 171 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 172 | * Write TCP options to segment. |
| 173 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 174 | static u32 |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 175 | tcp_options_write (u8 * data, tcp_options_t * opts) |
| 176 | { |
| 177 | u32 opts_len = 0; |
| 178 | u32 buf, seq_len = 4; |
| 179 | |
| 180 | if (tcp_opts_mss (opts)) |
| 181 | { |
| 182 | *data++ = TCP_OPTION_MSS; |
| 183 | *data++ = TCP_OPTION_LEN_MSS; |
| 184 | buf = clib_host_to_net_u16 (opts->mss); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 185 | clib_memcpy_fast (data, &buf, sizeof (opts->mss)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 186 | data += sizeof (opts->mss); |
| 187 | opts_len += TCP_OPTION_LEN_MSS; |
| 188 | } |
| 189 | |
| 190 | if (tcp_opts_wscale (opts)) |
| 191 | { |
| 192 | *data++ = TCP_OPTION_WINDOW_SCALE; |
| 193 | *data++ = TCP_OPTION_LEN_WINDOW_SCALE; |
| 194 | *data++ = opts->wscale; |
| 195 | opts_len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 196 | } |
| 197 | |
| 198 | if (tcp_opts_sack_permitted (opts)) |
| 199 | { |
| 200 | *data++ = TCP_OPTION_SACK_PERMITTED; |
| 201 | *data++ = TCP_OPTION_LEN_SACK_PERMITTED; |
| 202 | opts_len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 203 | } |
| 204 | |
| 205 | if (tcp_opts_tstamp (opts)) |
| 206 | { |
| 207 | *data++ = TCP_OPTION_TIMESTAMP; |
| 208 | *data++ = TCP_OPTION_LEN_TIMESTAMP; |
| 209 | buf = clib_host_to_net_u32 (opts->tsval); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 210 | clib_memcpy_fast (data, &buf, sizeof (opts->tsval)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 211 | data += sizeof (opts->tsval); |
| 212 | buf = clib_host_to_net_u32 (opts->tsecr); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 213 | clib_memcpy_fast (data, &buf, sizeof (opts->tsecr)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 214 | data += sizeof (opts->tsecr); |
| 215 | opts_len += TCP_OPTION_LEN_TIMESTAMP; |
| 216 | } |
| 217 | |
| 218 | if (tcp_opts_sack (opts)) |
| 219 | { |
| 220 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 221 | |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 222 | if (opts->n_sack_blocks != 0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 223 | { |
| 224 | *data++ = TCP_OPTION_SACK_BLOCK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 225 | *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
| 226 | for (i = 0; i < opts->n_sack_blocks; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 227 | { |
| 228 | buf = clib_host_to_net_u32 (opts->sacks[i].start); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 229 | clib_memcpy_fast (data, &buf, seq_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 230 | data += seq_len; |
| 231 | buf = clib_host_to_net_u32 (opts->sacks[i].end); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 232 | clib_memcpy_fast (data, &buf, seq_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 233 | data += seq_len; |
| 234 | } |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 235 | opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 236 | } |
| 237 | } |
| 238 | |
| 239 | /* Terminate TCP options */ |
| 240 | if (opts_len % 4) |
| 241 | { |
| 242 | *data++ = TCP_OPTION_EOL; |
| 243 | opts_len += TCP_OPTION_LEN_EOL; |
| 244 | } |
| 245 | |
| 246 | /* Pad with zeroes to a u32 boundary */ |
| 247 | while (opts_len % 4) |
| 248 | { |
| 249 | *data++ = TCP_OPTION_NOOP; |
| 250 | opts_len += TCP_OPTION_LEN_NOOP; |
| 251 | } |
| 252 | return opts_len; |
| 253 | } |
| 254 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 255 | static int |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 256 | tcp_make_syn_options (tcp_connection_t * tc, tcp_options_t * opts) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 257 | { |
| 258 | u8 len = 0; |
| 259 | |
| 260 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 261 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 262 | len += TCP_OPTION_LEN_MSS; |
| 263 | |
| 264 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 265 | opts->wscale = tc->rcv_wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 266 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 267 | |
| 268 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 269 | opts->tsval = tcp_time_now (); |
| 270 | opts->tsecr = 0; |
| 271 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 272 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 273 | if (TCP_USE_SACKS) |
| 274 | { |
| 275 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 276 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 277 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 278 | |
| 279 | /* Align to needed boundary */ |
| 280 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 281 | return len; |
| 282 | } |
| 283 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 284 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 285 | tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 286 | { |
| 287 | u8 len = 0; |
| 288 | |
| 289 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 290 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 291 | len += TCP_OPTION_LEN_MSS; |
| 292 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 293 | if (tcp_opts_wscale (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 294 | { |
| 295 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
| 296 | opts->wscale = tc->rcv_wscale; |
| 297 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 298 | } |
| 299 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 300 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 301 | { |
| 302 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 303 | opts->tsval = tcp_time_now (); |
| 304 | opts->tsecr = tc->tsval_recent; |
| 305 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 306 | } |
| 307 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 308 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 309 | { |
| 310 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 311 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 312 | } |
| 313 | |
| 314 | /* Align to needed boundary */ |
| 315 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 316 | return len; |
| 317 | } |
| 318 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 319 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 320 | tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 321 | { |
| 322 | u8 len = 0; |
| 323 | |
| 324 | opts->flags = 0; |
| 325 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 326 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 327 | { |
| 328 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Vladimir Kropylev | 1cfcb78 | 2019-07-02 11:25:26 +0300 | [diff] [blame] | 329 | opts->tsval = tcp_tstamp (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 330 | opts->tsecr = tc->tsval_recent; |
| 331 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 332 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 333 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 334 | { |
| 335 | if (vec_len (tc->snd_sacks)) |
| 336 | { |
| 337 | opts->flags |= TCP_OPTS_FLAG_SACK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 338 | if (tc->snd_sack_pos >= vec_len (tc->snd_sacks)) |
| 339 | tc->snd_sack_pos = 0; |
| 340 | opts->sacks = &tc->snd_sacks[tc->snd_sack_pos]; |
| 341 | opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos; |
| 342 | opts->n_sack_blocks = clib_min (opts->n_sack_blocks, |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 343 | TCP_OPTS_MAX_SACK_BLOCKS); |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 344 | tc->snd_sack_pos += opts->n_sack_blocks; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 345 | len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | /* Align to needed boundary */ |
| 350 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 351 | return len; |
| 352 | } |
| 353 | |
| 354 | always_inline int |
| 355 | tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, |
| 356 | tcp_state_t state) |
| 357 | { |
| 358 | switch (state) |
| 359 | { |
| 360 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 361 | case TCP_STATE_CLOSE_WAIT: |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 362 | case TCP_STATE_FIN_WAIT_1: |
| 363 | case TCP_STATE_LAST_ACK: |
| 364 | case TCP_STATE_CLOSING: |
| 365 | case TCP_STATE_FIN_WAIT_2: |
| 366 | case TCP_STATE_TIME_WAIT: |
| 367 | case TCP_STATE_CLOSED: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 368 | return tcp_make_established_options (tc, opts); |
| 369 | case TCP_STATE_SYN_RCVD: |
| 370 | return tcp_make_synack_options (tc, opts); |
| 371 | case TCP_STATE_SYN_SENT: |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 372 | return tcp_make_syn_options (tc, opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 373 | default: |
Florin Coras | 371ca50 | 2018-02-21 12:07:41 -0800 | [diff] [blame] | 374 | clib_warning ("State not handled! %d", state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 375 | return 0; |
| 376 | } |
| 377 | } |
| 378 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 379 | /** |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 380 | * Update burst send vars |
| 381 | * |
| 382 | * - Updates snd_mss to reflect the effective segment size that we can send |
| 383 | * by taking into account all TCP options, including SACKs. |
| 384 | * - Cache 'on the wire' options for reuse |
| 385 | * - Updates receive window which can be reused for a burst. |
| 386 | * |
| 387 | * This should *only* be called when doing bursts |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 388 | */ |
| 389 | void |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 390 | tcp_update_burst_snd_vars (tcp_connection_t * tc) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 391 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 392 | tcp_main_t *tm = &tcp_main; |
| 393 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 394 | /* Compute options to be used for connection. These may be reused when |
| 395 | * sending data or to compute the effective mss (snd_mss) */ |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 396 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, |
| 397 | TCP_STATE_ESTABLISHED); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 398 | |
| 399 | /* XXX check if MTU has been updated */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 400 | tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len; |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 401 | ASSERT (tc->snd_mss > 0); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 402 | |
| 403 | tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 404 | &tc->snd_opts); |
| 405 | |
| 406 | tcp_update_rcv_wnd (tc); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 407 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 408 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 409 | tcp_bt_check_app_limited (tc); |
Florin Coras | ca2831a | 2019-07-04 17:05:59 -0700 | [diff] [blame] | 410 | |
| 411 | if (tc->snd_una == tc->snd_nxt) |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 412 | { |
| 413 | tcp_cc_event (tc, TCP_CC_EVT_START_TX); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 414 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, TRANSPORT_PACER_MIN_BURST); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 415 | } |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 416 | } |
| 417 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 418 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 419 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 420 | static void * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 421 | tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 422 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 423 | if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| 424 | vlib_buffer_free_one (vm, b->next_buffer); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 425 | /* Zero all flags but free list index and trace flag */ |
| 426 | b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 427 | b->current_data = 0; |
| 428 | b->current_length = 0; |
| 429 | b->total_length_not_including_first_buffer = 0; |
| 430 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 431 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 432 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 433 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 434 | } |
| 435 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 436 | #ifndef CLIB_MARCH_VARIANT |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 437 | static void * |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 438 | tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 439 | { |
| 440 | ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 441 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 442 | b->total_length_not_including_first_buffer = 0; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 443 | b->current_data = 0; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 444 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 445 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 446 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 447 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 448 | } |
| 449 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 450 | |
| 451 | /* Compute TCP checksum in software when offloading is disabled for a connection */ |
| 452 | u16 |
| 453 | ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 454 | ip46_address_t * src, ip46_address_t * dst) |
| 455 | { |
| 456 | ip_csum_t sum0; |
| 457 | u16 payload_length_host_byte_order; |
| 458 | u32 i; |
| 459 | |
| 460 | /* Initialize checksum with ip header. */ |
| 461 | sum0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0)) + |
| 462 | clib_host_to_net_u16 (IP_PROTOCOL_TCP); |
| 463 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 464 | |
| 465 | for (i = 0; i < ARRAY_LEN (src->ip6.as_uword); i++) |
| 466 | { |
| 467 | sum0 = ip_csum_with_carry |
| 468 | (sum0, clib_mem_unaligned (&src->ip6.as_uword[i], uword)); |
| 469 | sum0 = ip_csum_with_carry |
| 470 | (sum0, clib_mem_unaligned (&dst->ip6.as_uword[i], uword)); |
| 471 | } |
| 472 | |
| 473 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 474 | payload_length_host_byte_order, NULL, 0, |
| 475 | NULL); |
| 476 | } |
| 477 | |
| 478 | u16 |
| 479 | ip4_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 480 | ip46_address_t * src, ip46_address_t * dst) |
| 481 | { |
| 482 | ip_csum_t sum0; |
| 483 | u32 payload_length_host_byte_order; |
| 484 | |
| 485 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 486 | sum0 = |
| 487 | clib_host_to_net_u32 (payload_length_host_byte_order + |
| 488 | (IP_PROTOCOL_TCP << 16)); |
| 489 | |
| 490 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&src->ip4, u32)); |
| 491 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&dst->ip4, u32)); |
| 492 | |
| 493 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 494 | payload_length_host_byte_order, NULL, 0, |
| 495 | NULL); |
| 496 | } |
| 497 | |
| 498 | static inline u16 |
| 499 | tcp_compute_checksum (tcp_connection_t * tc, vlib_buffer_t * b) |
| 500 | { |
| 501 | u16 checksum = 0; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 502 | if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD)) |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 503 | { |
| 504 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 505 | vlib_main_t *vm = wrk->vm; |
| 506 | |
| 507 | if (tc->c_is_ip4) |
| 508 | checksum = ip4_tcp_compute_checksum_custom |
| 509 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 510 | else |
| 511 | checksum = ip6_tcp_compute_checksum_custom |
| 512 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 513 | } |
| 514 | else |
| 515 | { |
| 516 | b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 517 | } |
| 518 | return checksum; |
| 519 | } |
| 520 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 521 | /** |
| 522 | * Prepare ACK |
| 523 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 524 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 525 | tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, |
| 526 | u8 flags) |
| 527 | { |
| 528 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 529 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 530 | tcp_header_t *th; |
| 531 | u16 wnd; |
| 532 | |
| 533 | wnd = tcp_window_to_advertise (tc, state); |
| 534 | |
| 535 | /* Make and write options */ |
| 536 | tcp_opts_len = tcp_make_established_options (tc, snd_opts); |
| 537 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 538 | |
| 539 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 540 | tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd); |
| 541 | |
| 542 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 543 | |
| 544 | th->checksum = tcp_compute_checksum (tc, b); |
| 545 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 546 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 547 | |
| 548 | if (wnd == 0) |
| 549 | tcp_zero_rwnd_sent_on (tc); |
| 550 | else |
| 551 | tcp_zero_rwnd_sent_off (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | /** |
| 555 | * Convert buffer to ACK |
| 556 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 557 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 559 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 560 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 561 | TCP_EVT (TCP_EVT_ACK_SENT, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 562 | tc->rcv_las = tc->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | /** |
| 566 | * Convert buffer to FIN-ACK |
| 567 | */ |
| 568 | void |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 569 | tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 570 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 571 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 572 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 573 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 574 | /** |
| 575 | * Convert buffer to SYN |
| 576 | */ |
| 577 | void |
| 578 | tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) |
| 579 | { |
| 580 | u8 tcp_hdr_opts_len, tcp_opts_len; |
| 581 | tcp_header_t *th; |
| 582 | u16 initial_wnd; |
| 583 | tcp_options_t snd_opts; |
| 584 | |
| 585 | initial_wnd = tcp_initial_window_to_advertise (tc); |
| 586 | |
| 587 | /* Make and write options */ |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 588 | clib_memset (&snd_opts, 0, sizeof (snd_opts)); |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 589 | tcp_opts_len = tcp_make_syn_options (tc, &snd_opts); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 590 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 591 | |
| 592 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 593 | tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, |
| 594 | initial_wnd); |
| 595 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 596 | tcp_options_write ((u8 *) (th + 1), &snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 597 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | /** |
| 601 | * Convert buffer to SYN-ACK |
| 602 | */ |
| 603 | void |
| 604 | tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 605 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 606 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 607 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 608 | tcp_header_t *th; |
| 609 | u16 initial_wnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 610 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 611 | clib_memset (snd_opts, 0, sizeof (*snd_opts)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 612 | initial_wnd = tcp_initial_window_to_advertise (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 613 | tcp_opts_len = tcp_make_synack_options (tc, snd_opts); |
| 614 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 615 | |
| 616 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 617 | tc->rcv_nxt, tcp_hdr_opts_len, |
| 618 | TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 619 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
| 620 | |
| 621 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 622 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | always_inline void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 626 | tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 627 | u8 is_ip4, u32 fib_index, u8 flush) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 628 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 629 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 630 | u32 *to_next, next_index; |
| 631 | vlib_frame_t *f; |
| 632 | |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 633 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 634 | b->error = 0; |
| 635 | |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 636 | vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; |
| 637 | vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 638 | |
| 639 | /* Send to IP lookup */ |
| 640 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 641 | tcp_trajectory_add_start (b, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 642 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 643 | f = wrk->ip_lookup_tx_frames[!is_ip4]; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 644 | if (!f) |
| 645 | { |
| 646 | f = vlib_get_frame_to_node (vm, next_index); |
| 647 | ASSERT (f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 648 | wrk->ip_lookup_tx_frames[!is_ip4] = f; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 649 | } |
| 650 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 651 | to_next = vlib_frame_vector_args (f); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 652 | to_next[f->n_vectors] = bi; |
| 653 | f->n_vectors += 1; |
| 654 | if (flush || f->n_vectors == VLIB_FRAME_SIZE) |
| 655 | { |
| 656 | vlib_put_frame_to_node (vm, next_index, f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 657 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 658 | } |
| 659 | } |
| 660 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 661 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 662 | tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, |
| 663 | u32 bi, u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 664 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 665 | tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 666 | } |
| 667 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 668 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 669 | tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 670 | u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 671 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 672 | tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0); |
| 673 | if (wrk->vm->thread_index == 0 && vlib_num_workers ()) |
| 674 | session_flush_frames_main_thread (wrk->vm); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 675 | } |
| 676 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 677 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 678 | tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 679 | u8 is_ip4) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 680 | { |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 681 | session_type_t st; |
| 682 | |
| 683 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| 684 | b->error = 0; |
| 685 | |
| 686 | st = session_type_from_proto_and_ip (TRANSPORT_PROTO_TCP, is_ip4); |
| 687 | session_add_pending_tx_buffer (st, wrk->vm->thread_index, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 688 | } |
| 689 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 690 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 691 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 692 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 693 | tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0, |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 694 | tcp_state_t state, u8 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 695 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 696 | ip4_header_t *ih4; |
| 697 | ip6_header_t *ih6; |
| 698 | tcp_header_t *th0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 699 | ip4_address_t src_ip40, dst_ip40; |
| 700 | ip6_address_t src_ip60, dst_ip60; |
| 701 | u16 src_port, dst_port; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 702 | u32 tmp; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 703 | u32 seq, ack; |
| 704 | u8 flags; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 705 | |
| 706 | /* Find IP and TCP headers */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 707 | th0 = tcp_buffer_hdr (b0); |
| 708 | |
| 709 | /* Save src and dst ip */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 710 | if (is_ip4) |
| 711 | { |
| 712 | ih4 = vlib_buffer_get_current (b0); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 713 | ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 714 | src_ip40.as_u32 = ih4->src_address.as_u32; |
| 715 | dst_ip40.as_u32 = ih4->dst_address.as_u32; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 716 | } |
| 717 | else |
| 718 | { |
| 719 | ih6 = vlib_buffer_get_current (b0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 720 | ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 721 | clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t)); |
| 722 | clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 723 | } |
| 724 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 725 | src_port = th0->src_port; |
| 726 | dst_port = th0->dst_port; |
| 727 | |
| 728 | /* Try to determine what/why we're actually resetting */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 729 | if (state == TCP_STATE_CLOSED) |
| 730 | { |
| 731 | if (!tcp_syn (th0)) |
| 732 | return -1; |
| 733 | |
| 734 | tmp = clib_net_to_host_u32 (th0->seq_number); |
| 735 | |
| 736 | /* Got a SYN for no listener. */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 737 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 738 | ack = clib_host_to_net_u32 (tmp + 1); |
| 739 | seq = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 740 | } |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 741 | else |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 742 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 743 | flags = TCP_FLAG_RST; |
| 744 | seq = th0->ack_number; |
| 745 | ack = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 746 | } |
| 747 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 748 | tcp_reuse_buffer (vm, b0); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 749 | tcp_trajectory_add_start (b0, 4); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 750 | th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack, |
| 751 | sizeof (tcp_header_t), flags, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 752 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 753 | if (is_ip4) |
| 754 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 755 | ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 756 | IP_PROTOCOL_TCP, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 757 | th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4); |
| 758 | } |
| 759 | else |
| 760 | { |
| 761 | int bogus = ~0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 762 | ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60, |
| 763 | IP_PROTOCOL_TCP); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 764 | th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus); |
| 765 | ASSERT (!bogus); |
| 766 | } |
| 767 | |
| 768 | return 0; |
| 769 | } |
| 770 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 771 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 772 | /** |
| 773 | * Send reset without reusing existing buffer |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 774 | * |
| 775 | * It extracts connection info out of original packet |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 776 | */ |
| 777 | void |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 778 | tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, |
| 779 | u32 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 780 | { |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 781 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 782 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 783 | vlib_buffer_t *b; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 784 | u32 bi, sw_if_index, fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 785 | u8 tcp_hdr_len, flags = 0; |
| 786 | tcp_header_t *th, *pkt_th; |
| 787 | u32 seq, ack; |
| 788 | ip4_header_t *ih4, *pkt_ih4; |
| 789 | ip6_header_t *ih6, *pkt_ih6; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 790 | fib_protocol_t fib_proto; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 791 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 792 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 793 | return; |
| 794 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 795 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 796 | sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; |
| 797 | fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| 798 | fib_index = fib_table_get_index_for_sw_if_index (fib_proto, sw_if_index); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 799 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 800 | |
| 801 | /* Make and write options */ |
| 802 | tcp_hdr_len = sizeof (tcp_header_t); |
| 803 | |
| 804 | if (is_ip4) |
| 805 | { |
| 806 | pkt_ih4 = vlib_buffer_get_current (pkt); |
| 807 | pkt_th = ip4_next_header (pkt_ih4); |
| 808 | } |
| 809 | else |
| 810 | { |
| 811 | pkt_ih6 = vlib_buffer_get_current (pkt); |
| 812 | pkt_th = ip6_next_header (pkt_ih6); |
| 813 | } |
| 814 | |
| 815 | if (tcp_ack (pkt_th)) |
| 816 | { |
| 817 | flags = TCP_FLAG_RST; |
| 818 | seq = pkt_th->ack_number; |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 819 | ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 820 | } |
| 821 | else |
| 822 | { |
| 823 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 824 | seq = 0; |
| 825 | ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end); |
| 826 | } |
| 827 | |
| 828 | th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port, |
| 829 | seq, ack, tcp_hdr_len, flags, 0); |
| 830 | |
| 831 | /* Swap src and dst ip */ |
| 832 | if (is_ip4) |
| 833 | { |
| 834 | ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 835 | ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address, |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 836 | &pkt_ih4->src_address, IP_PROTOCOL_TCP, |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 837 | tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 838 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 839 | } |
| 840 | else |
| 841 | { |
| 842 | int bogus = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 843 | ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) == |
| 844 | 0x60); |
Tarun Gupta | 2089c69 | 2019-11-04 16:35:59 -0800 | [diff] [blame] | 845 | ih6 = vlib_buffer_push_ip6_custom (vm, b, &pkt_ih6->dst_address, |
| 846 | &pkt_ih6->src_address, |
| 847 | IP_PROTOCOL_TCP, |
| 848 | tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 849 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 850 | ASSERT (!bogus); |
| 851 | } |
| 852 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 853 | tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 854 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 855 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 856 | TCP_ERROR_RST_SENT, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 857 | } |
| 858 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 859 | /** |
| 860 | * Build and set reset packet for connection |
| 861 | */ |
| 862 | void |
| 863 | tcp_send_reset (tcp_connection_t * tc) |
| 864 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 865 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 866 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 867 | vlib_buffer_t *b; |
| 868 | u32 bi; |
| 869 | tcp_header_t *th; |
| 870 | u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; |
| 871 | u8 flags; |
| 872 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 873 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 874 | return; |
| 875 | b = vlib_get_buffer (vm, bi); |
| 876 | tcp_init_buffer (vm, b); |
| 877 | |
| 878 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 879 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
| 880 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
| 881 | flags = TCP_FLAG_RST; |
| 882 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 883 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 884 | advertise_wnd); |
| 885 | opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 886 | th->checksum = tcp_compute_checksum (tc, b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 887 | ASSERT (opts_write_len == tc->snd_opts_len); |
| 888 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 889 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 890 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 891 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 892 | TCP_ERROR_RST_SENT, 1); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 893 | } |
| 894 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 895 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 896 | tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 897 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 898 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 899 | if (tc->c_is_ip4) |
| 900 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 901 | vlib_buffer_push_ip4 (wrk->vm, b, &tc->c_lcl_ip4, &tc->c_rmt_ip4, |
| 902 | IP_PROTOCOL_TCP, tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 903 | } |
| 904 | else |
| 905 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 906 | vlib_buffer_push_ip6_custom (wrk->vm, b, &tc->c_lcl_ip6, &tc->c_rmt_ip6, |
| 907 | IP_PROTOCOL_TCP, tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 908 | } |
| 909 | } |
| 910 | |
| 911 | /** |
| 912 | * Send SYN |
| 913 | * |
| 914 | * Builds a SYN packet for a half-open connection and sends it to ipx_lookup. |
| 915 | * The packet is not forwarded through tcpx_output to avoid doing lookups |
| 916 | * in the half_open pool. |
| 917 | */ |
| 918 | void |
| 919 | tcp_send_syn (tcp_connection_t * tc) |
| 920 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 921 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 922 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 923 | vlib_buffer_t *b; |
| 924 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 925 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 926 | /* |
| 927 | * Setup retransmit and establish timers before requesting buffer |
| 928 | * such that we can return if we've ran out. |
| 929 | */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 930 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 931 | tc->rto * TCP_TO_TIMER_TICK); |
| 932 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 933 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 934 | { |
| 935 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
| 936 | return; |
| 937 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 938 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 939 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 940 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 941 | tcp_make_syn (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 942 | |
| 943 | /* Measure RTT with this */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 944 | tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 945 | tc->rtt_seq = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 946 | tc->rto_boff = 0; |
| 947 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 948 | tcp_push_ip_hdr (wrk, tc, b); |
| 949 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 950 | TCP_EVT (TCP_EVT_SYN_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 951 | } |
| 952 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 953 | void |
| 954 | tcp_send_synack (tcp_connection_t * tc) |
| 955 | { |
| 956 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 957 | vlib_main_t *vm = wrk->vm; |
| 958 | vlib_buffer_t *b; |
| 959 | u32 bi; |
| 960 | |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 961 | tcp_retransmit_timer_force_update (tc); |
| 962 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 963 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 964 | { |
| 965 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
| 966 | return; |
| 967 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 968 | |
Florin Coras | df08478 | 2018-12-06 17:41:10 -0800 | [diff] [blame] | 969 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 970 | b = vlib_get_buffer (vm, bi); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 971 | tcp_init_buffer (vm, b); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 972 | tcp_make_synack (tc, b); |
| 973 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 974 | TCP_EVT (TCP_EVT_SYNACK_SENT, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 975 | } |
| 976 | |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 977 | /** |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 978 | * Flush ip lookup tx frames populated by timer pops |
| 979 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 980 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 981 | tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 982 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 983 | if (wrk->ip_lookup_tx_frames[!is_ip4]) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 984 | { |
| 985 | u32 next_index; |
| 986 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 987 | vlib_put_frame_to_node (wrk->vm, next_index, |
| 988 | wrk->ip_lookup_tx_frames[!is_ip4]); |
| 989 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 990 | } |
| 991 | } |
| 992 | |
| 993 | /** |
| 994 | * Flush v4 and v6 tcp and ip-lookup tx frames for thread index |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 995 | */ |
| 996 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 997 | tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 998 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 999 | tcp_flush_frame_to_ip_lookup (wrk, 1); |
| 1000 | tcp_flush_frame_to_ip_lookup (wrk, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1001 | } |
| 1002 | |
| 1003 | /** |
| 1004 | * Send FIN |
| 1005 | */ |
| 1006 | void |
| 1007 | tcp_send_fin (tcp_connection_t * tc) |
| 1008 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1009 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1010 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1011 | vlib_buffer_t *b; |
| 1012 | u32 bi; |
| 1013 | u8 fin_snt = 0; |
| 1014 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1015 | fin_snt = tc->flags & TCP_CONN_FINSNT; |
| 1016 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1017 | tc->snd_nxt -= 1; |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1018 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1019 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1020 | { |
| 1021 | /* Out of buffers so program fin retransmit ASAP */ |
| 1022 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1023 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1024 | tc->snd_nxt += 1; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1025 | else |
| 1026 | /* Make sure retransmit retries a fin not data */ |
| 1027 | tc->flags |= TCP_CONN_FINSNT; |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1028 | return; |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1031 | /* If we have non-dupacks programmed, no need to send them */ |
| 1032 | if ((tc->flags & TCP_CONN_SNDACK) && !tc->pending_dupacks) |
| 1033 | tc->flags &= ~TCP_CONN_SNDACK; |
| 1034 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1035 | tcp_retransmit_timer_force_update (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1036 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1037 | tcp_init_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1038 | tcp_make_fin (tc, b); |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 1039 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1040 | TCP_EVT (TCP_EVT_FIN_SENT, tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1041 | /* Account for the FIN */ |
| 1042 | tc->snd_nxt += 1; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1043 | if (!fin_snt) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1044 | { |
| 1045 | tc->flags |= TCP_CONN_FINSNT; |
| 1046 | tc->flags &= ~TCP_CONN_FINPNDG; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1047 | tc->snd_una_max = seq_max (tc->snd_una_max, tc->snd_nxt); |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1048 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1049 | } |
| 1050 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1051 | /** |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 1052 | * Push TCP header and update connection variables. Should only be called |
| 1053 | * for segments with data, not for 'control' packets. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1054 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1055 | always_inline void |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1056 | tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt, |
| 1057 | u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1058 | { |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 1059 | u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1060 | u32 advertise_wnd, data_len; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1061 | tcp_main_t *tm = &tcp_main; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1062 | tcp_header_t *th; |
| 1063 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1064 | data_len = b->current_length; |
| 1065 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1066 | data_len += b->total_length_not_including_first_buffer; |
| 1067 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1068 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1069 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1070 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1071 | if (compute_opts) |
| 1072 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1073 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1074 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1075 | |
| 1076 | if (maybe_burst) |
| 1077 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
| 1078 | else |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1079 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1080 | |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 1081 | if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) |
| 1082 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1083 | if (seq_geq (tc->psh_seq, snd_nxt) |
| 1084 | && seq_lt (tc->psh_seq, snd_nxt + data_len)) |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 1085 | flags |= TCP_FLAG_PSH; |
| 1086 | } |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1087 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, snd_nxt, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1088 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 1089 | advertise_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1090 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1091 | if (maybe_burst) |
| 1092 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1093 | clib_memcpy_fast ((u8 *) (th + 1), |
| 1094 | tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 1095 | tc->snd_opts_len); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1096 | } |
| 1097 | else |
| 1098 | { |
| 1099 | u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 1100 | ASSERT (len == tc->snd_opts_len); |
| 1101 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1102 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1103 | /* |
| 1104 | * Update connection variables |
| 1105 | */ |
| 1106 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1107 | if (update_snd_nxt) |
| 1108 | tc->snd_nxt += data_len; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1109 | tc->rcv_las = tc->rcv_nxt; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1110 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1111 | tc->bytes_out += data_len; |
| 1112 | tc->data_segs_out += 1; |
| 1113 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 1114 | th->checksum = tcp_compute_checksum (tc, b); |
| 1115 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1116 | TCP_EVT (TCP_EVT_PKTIZE, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1117 | } |
| 1118 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1119 | always_inline u32 |
| 1120 | tcp_buffer_len (vlib_buffer_t * b) |
| 1121 | { |
| 1122 | u32 data_len = b->current_length; |
| 1123 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1124 | data_len += b->total_length_not_including_first_buffer; |
| 1125 | return data_len; |
| 1126 | } |
| 1127 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1128 | u32 |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 1129 | tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b) |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1130 | { |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 1131 | tcp_connection_t *tc = (tcp_connection_t *) tconn; |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1132 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1133 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1134 | tcp_bt_track_tx (tc, tcp_buffer_len (b)); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1135 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1136 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1, |
| 1137 | /* update_snd_nxt */ 1); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1138 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1139 | tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1140 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
| 1141 | /* If not tracking an ACK, start tracking */ |
| 1142 | if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) |
| 1143 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1144 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1145 | tc->rtt_seq = tc->snd_nxt; |
| 1146 | } |
| 1147 | if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) |
| 1148 | { |
| 1149 | tcp_retransmit_timer_set (tc); |
| 1150 | tc->rto_boff = 0; |
| 1151 | } |
| 1152 | tcp_trajectory_add_start (b, 3); |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1156 | void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1157 | tcp_send_ack (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1158 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1159 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1160 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1161 | vlib_buffer_t *b; |
| 1162 | u32 bi; |
| 1163 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1164 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1165 | { |
| 1166 | tcp_update_rcv_wnd (tc); |
| 1167 | return; |
| 1168 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1169 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1170 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1171 | tcp_make_ack (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1172 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1173 | } |
| 1174 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1175 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1176 | tcp_program_ack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1177 | { |
| 1178 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1179 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1180 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1181 | tc->flags |= TCP_CONN_SNDACK; |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1186 | tcp_program_dupack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1187 | { |
| 1188 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1189 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1190 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1191 | tc->flags |= TCP_CONN_SNDACK; |
| 1192 | } |
| 1193 | if (tc->pending_dupacks < 255) |
| 1194 | tc->pending_dupacks += 1; |
| 1195 | } |
| 1196 | |
| 1197 | void |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1198 | tcp_program_retransmit (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1199 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1200 | if (!(tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1201 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1202 | session_add_self_custom_tx_evt (&tc->connection, 0); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1203 | tc->flags |= TCP_CONN_RXT_PENDING; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1204 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1205 | } |
| 1206 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1207 | /** |
| 1208 | * Delayed ack timer handler |
| 1209 | * |
| 1210 | * Sends delayed ACK when timer expires |
| 1211 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1212 | void |
Florin Coras | b72a0ff | 2019-11-22 17:38:25 -0800 | [diff] [blame] | 1213 | tcp_timer_delack_handler (u32 index, u32 thread_index) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1214 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1215 | tcp_connection_t *tc; |
| 1216 | |
| 1217 | tc = tcp_connection_get (index, thread_index); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1218 | tcp_send_ack (tc); |
| 1219 | } |
| 1220 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1221 | /** |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1222 | * Send window update ack |
| 1223 | * |
| 1224 | * Ensures that it will be sent only once, after a zero rwnd has been |
| 1225 | * advertised in a previous ack, and only if rwnd has grown beyond a |
| 1226 | * configurable value. |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1227 | */ |
| 1228 | void |
| 1229 | tcp_send_window_update_ack (tcp_connection_t * tc) |
| 1230 | { |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1231 | if (tcp_zero_rwnd_sent (tc)) |
| 1232 | { |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1233 | tcp_update_rcv_wnd (tc); |
| 1234 | if (tc->rcv_wnd >= tcp_cfg.rwnd_min_update_ack * tc->snd_mss) |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1235 | { |
| 1236 | tcp_zero_rwnd_sent_off (tc); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1237 | tcp_program_ack (tc); |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1238 | } |
| 1239 | } |
| 1240 | } |
| 1241 | |
| 1242 | /** |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1243 | * Allocate a new buffer and build a new tcp segment |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1244 | * |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1245 | * @param wrk tcp worker |
| 1246 | * @param tc connection for which the segment will be allocated |
| 1247 | * @param offset offset of the first byte in the tx fifo |
| 1248 | * @param max_deq_byte segment size |
| 1249 | * @param[out] b pointer to buffer allocated |
| 1250 | * |
| 1251 | * @return the number of bytes in the segment or 0 if buffer cannot be |
| 1252 | * allocated or no data available |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1253 | */ |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1254 | static int |
| 1255 | tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1256 | u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1257 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1258 | u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; |
| 1259 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1260 | u32 bi, seg_size; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1261 | int n_bytes = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1262 | u8 *data; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1263 | |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 1264 | seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1265 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1266 | /* |
| 1267 | * Prepare options |
| 1268 | */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1269 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1270 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1271 | /* |
| 1272 | * Allocate and fill in buffer(s) |
| 1273 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1274 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1275 | /* Easy case, buffer size greater than mss */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1276 | if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1277 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1278 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1279 | return 0; |
| 1280 | *b = vlib_get_buffer (vm, bi); |
| 1281 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1282 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1283 | max_deq_bytes); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1284 | ASSERT (n_bytes == max_deq_bytes); |
| 1285 | b[0]->current_length = n_bytes; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1286 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1287 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1288 | } |
| 1289 | /* Split mss into multiple buffers */ |
| 1290 | else |
| 1291 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1292 | u32 chain_bi = ~0, n_bufs_per_seg, n_bufs; |
| 1293 | u16 n_peeked, len_to_deq; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1294 | vlib_buffer_t *chain_b, *prev_b; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1295 | int i; |
| 1296 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1297 | /* Make sure we have enough buffers */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1298 | n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1299 | vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1, |
| 1300 | CLIB_CACHE_LINE_BYTES); |
| 1301 | n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg); |
| 1302 | if (PREDICT_FALSE (n_bufs != n_bufs_per_seg)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1303 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1304 | if (n_bufs) |
| 1305 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1306 | return 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1307 | } |
| 1308 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1309 | *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1310 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1311 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1312 | bytes_per_buffer - |
| 1313 | TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1314 | b[0]->current_length = n_bytes; |
| 1315 | b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| 1316 | b[0]->total_length_not_including_first_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1317 | max_deq_bytes -= n_bytes; |
| 1318 | |
| 1319 | chain_b = *b; |
| 1320 | for (i = 1; i < n_bufs_per_seg; i++) |
| 1321 | { |
| 1322 | prev_b = chain_b; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1323 | len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1324 | chain_bi = wrk->tx_buffers[--n_bufs]; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1325 | chain_b = vlib_get_buffer (vm, chain_bi); |
| 1326 | chain_b->current_data = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1327 | data = vlib_buffer_get_current (chain_b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1328 | n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data, |
| 1329 | offset + n_bytes, |
| 1330 | len_to_deq); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1331 | ASSERT (n_peeked == len_to_deq); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1332 | n_bytes += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1333 | chain_b->current_length = n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1334 | chain_b->next_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1335 | |
| 1336 | /* update previous buffer */ |
| 1337 | prev_b->next_buffer = chain_bi; |
| 1338 | prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| 1339 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1340 | max_deq_bytes -= n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1341 | b[0]->total_length_not_including_first_buffer += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1342 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1343 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1344 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1345 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1346 | |
| 1347 | if (PREDICT_FALSE (n_bufs)) |
| 1348 | { |
| 1349 | clib_warning ("not all buffers consumed"); |
| 1350 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1351 | } |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1352 | } |
| 1353 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1354 | ASSERT (n_bytes > 0); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1355 | ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1356 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1357 | return n_bytes; |
| 1358 | } |
| 1359 | |
| 1360 | /** |
| 1361 | * Build a retransmit segment |
| 1362 | * |
| 1363 | * @return the number of bytes in the segment or 0 if there's nothing to |
| 1364 | * retransmit |
| 1365 | */ |
| 1366 | static u32 |
| 1367 | tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, |
| 1368 | tcp_connection_t * tc, u32 offset, |
| 1369 | u32 max_deq_bytes, vlib_buffer_t ** b) |
| 1370 | { |
| 1371 | u32 start, available_bytes; |
| 1372 | int n_bytes = 0; |
| 1373 | |
| 1374 | ASSERT (tc->state >= TCP_STATE_ESTABLISHED); |
| 1375 | ASSERT (max_deq_bytes != 0); |
| 1376 | |
| 1377 | /* |
| 1378 | * Make sure we can retransmit something |
| 1379 | */ |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1380 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1381 | ASSERT (available_bytes >= offset); |
| 1382 | available_bytes -= offset; |
| 1383 | if (!available_bytes) |
| 1384 | return 0; |
| 1385 | |
| 1386 | max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes); |
| 1387 | max_deq_bytes = clib_min (available_bytes, max_deq_bytes); |
| 1388 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1389 | start = tc->snd_una + offset; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1390 | ASSERT (seq_leq (start + max_deq_bytes, tc->snd_nxt)); |
| 1391 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1392 | n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b); |
| 1393 | if (!n_bytes) |
| 1394 | return 0; |
| 1395 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1396 | tc->snd_rxt_bytes += n_bytes; |
| 1397 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1398 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1399 | tcp_bt_track_rxt (tc, start, start + n_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1400 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1401 | tc->bytes_retrans += n_bytes; |
| 1402 | tc->segs_retrans += 1; |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1403 | TCP_EVT (TCP_EVT_CC_RTX, tc, offset, n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1404 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1405 | return n_bytes; |
| 1406 | } |
| 1407 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1408 | static void |
| 1409 | tcp_check_sack_reneging (tcp_connection_t * tc) |
| 1410 | { |
| 1411 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 1412 | sack_scoreboard_hole_t *hole; |
| 1413 | |
| 1414 | hole = scoreboard_first_hole (sb); |
| 1415 | if (!sb->is_reneging && (!hole || hole->start == tc->snd_una)) |
| 1416 | return; |
| 1417 | |
| 1418 | scoreboard_clear_reneging (sb, tc->snd_una, tc->snd_nxt); |
| 1419 | } |
| 1420 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1421 | /** |
| 1422 | * Reset congestion control, switch cwnd to loss window and try again. |
| 1423 | */ |
| 1424 | static void |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1425 | tcp_cc_init_rxt_timeout (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1426 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1427 | TCP_EVT (TCP_EVT_CC_EVT, tc, 6); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1428 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1429 | tc->prev_ssthresh = tc->ssthresh; |
| 1430 | tc->prev_cwnd = tc->cwnd; |
| 1431 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1432 | /* If we entrered loss without fast recovery, notify cc algo of the |
| 1433 | * congestion event such that it can update ssthresh and its state */ |
| 1434 | if (!tcp_in_fastrecovery (tc)) |
| 1435 | tcp_cc_congestion (tc); |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1436 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1437 | /* Let cc algo decide loss cwnd and ssthresh post unrecovered loss */ |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1438 | tcp_cc_loss (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1439 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1440 | tc->rtt_ts = 0; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1441 | tc->cwnd_acc_bytes = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1442 | tc->tr_occurences += 1; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1443 | tcp_recovery_on (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1444 | } |
| 1445 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1446 | void |
Florin Coras | b72a0ff | 2019-11-22 17:38:25 -0800 | [diff] [blame] | 1447 | tcp_timer_retransmit_handler (u32 tc_index, u32 thread_index) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1448 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1449 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1450 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1451 | tcp_connection_t *tc; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1452 | vlib_buffer_t *b = 0; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1453 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1454 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1455 | tc = tcp_connection_get (tc_index, thread_index); |
| 1456 | |
| 1457 | /* Note: the connection may have been closed and pool_put */ |
| 1458 | if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT)) |
| 1459 | return; |
| 1460 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1461 | /* Wait-close and retransmit could pop at the same time */ |
| 1462 | if (tc->state == TCP_STATE_CLOSED) |
| 1463 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1464 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1465 | if (tc->state >= TCP_STATE_ESTABLISHED) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1466 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1467 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1468 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1469 | /* Lost FIN, retransmit and return */ |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1470 | if (tc->flags & TCP_CONN_FINSNT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1471 | { |
| 1472 | tcp_send_fin (tc); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1473 | tc->rto_boff += 1; |
| 1474 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1475 | return; |
| 1476 | } |
| 1477 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1478 | /* Shouldn't be here. This condition is tricky because it has to take |
| 1479 | * into account boff > 0 due to persist timeout. */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1480 | if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1481 | || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion) |
| 1482 | && !tcp_flight_size (tc))) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1483 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1484 | ASSERT (!tcp_in_recovery (tc)); |
| 1485 | tc->rto_boff = 0; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1486 | return; |
| 1487 | } |
| 1488 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1489 | /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due |
| 1490 | * to persist timer timeout */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1491 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1492 | { |
| 1493 | tc->rto_boff = 0; |
| 1494 | tcp_update_rto (tc); |
| 1495 | } |
| 1496 | |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1497 | /* Peer is dead or network connectivity is lost. Close connection. |
| 1498 | * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For |
| 1499 | * a min rto of 0.2s we need to retry about 8 times. */ |
| 1500 | if (tc->rto_boff >= TCP_RTO_BOFF_MAX) |
| 1501 | { |
| 1502 | tcp_send_reset (tc); |
| 1503 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1504 | session_transport_closing_notify (&tc->connection); |
Florin Coras | 52be674 | 2019-11-14 23:32:08 -0800 | [diff] [blame] | 1505 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1506 | tcp_connection_timers_reset (tc); |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 1507 | tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1508 | return; |
| 1509 | } |
| 1510 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1511 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 1512 | tcp_check_sack_reneging (tc); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1513 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1514 | /* Update send congestion to make sure that rxt has data to send */ |
| 1515 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1516 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1517 | /* Send the first unacked segment. If we're short on buffers, return |
| 1518 | * as soon as possible */ |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1519 | n_bytes = clib_min (tc->snd_mss, tc->snd_nxt - tc->snd_una); |
| 1520 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, n_bytes, &b); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1521 | if (!n_bytes) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1522 | { |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1523 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1524 | return; |
| 1525 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1526 | |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1527 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1528 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1529 | |
| 1530 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1531 | tcp_retransmit_timer_force_update (tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1532 | |
| 1533 | tc->rto_boff += 1; |
| 1534 | if (tc->rto_boff == 1) |
| 1535 | { |
| 1536 | tcp_cc_init_rxt_timeout (tc); |
| 1537 | /* Record timestamp. Eifel detection algorithm RFC3522 */ |
| 1538 | tc->snd_rxt_ts = tcp_tstamp (tc); |
| 1539 | } |
| 1540 | |
| 1541 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1542 | scoreboard_init_rxt (&tc->sack_sb, tc->snd_una + n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1543 | |
| 1544 | tcp_program_retransmit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1545 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1546 | /* Retransmit SYN-ACK */ |
| 1547 | else if (tc->state == TCP_STATE_SYN_RCVD) |
| 1548 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1549 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1550 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1551 | tc->rtt_ts = 0; |
| 1552 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1553 | /* Passive open establish timeout */ |
| 1554 | if (tc->rto > TCP_ESTABLISH_TIME >> 1) |
| 1555 | { |
| 1556 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1557 | tcp_connection_timers_reset (tc); |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 1558 | tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1559 | return; |
| 1560 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1561 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1562 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1563 | { |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1564 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1565 | return; |
| 1566 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1567 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1568 | tc->rto_boff += 1; |
| 1569 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1570 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1571 | |
| 1572 | tcp_retransmit_timer_force_update (tc); |
| 1573 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1574 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1575 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1576 | tcp_make_synack (tc, b); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1577 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 1); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1578 | |
| 1579 | /* Retransmit timer already updated, just enqueue to output */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1580 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1581 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1582 | else |
| 1583 | { |
| 1584 | ASSERT (tc->state == TCP_STATE_CLOSED); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1585 | return; |
| 1586 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1587 | } |
| 1588 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1589 | /** |
| 1590 | * SYN retransmit timer handler. Active open only. |
| 1591 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1592 | void |
Florin Coras | b72a0ff | 2019-11-22 17:38:25 -0800 | [diff] [blame] | 1593 | tcp_timer_retransmit_syn_handler (u32 tc_index, u32 thread_index) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1594 | { |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1595 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1596 | vlib_main_t *vm = wrk->vm; |
| 1597 | tcp_connection_t *tc; |
| 1598 | vlib_buffer_t *b = 0; |
| 1599 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1600 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1601 | tc = tcp_half_open_connection_get (tc_index); |
| 1602 | |
| 1603 | /* Note: the connection may have transitioned to ESTABLISHED... */ |
| 1604 | if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT)) |
| 1605 | return; |
| 1606 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1607 | /* Half-open connection actually moved to established but we were |
| 1608 | * waiting for syn retransmit to pop to call cleanup from the right |
| 1609 | * thread. */ |
| 1610 | if (tc->flags & TCP_CONN_HALF_OPEN_DONE) |
| 1611 | { |
| 1612 | if (tcp_half_open_connection_cleanup (tc)) |
| 1613 | TCP_DBG ("could not remove half-open connection"); |
| 1614 | return; |
| 1615 | } |
| 1616 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1617 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1618 | tc->rtt_ts = 0; |
| 1619 | |
| 1620 | /* Active open establish timeout */ |
| 1621 | if (tc->rto >= TCP_ESTABLISH_TIME >> 1) |
| 1622 | { |
| 1623 | session_stream_connect_notify (&tc->connection, 1 /* fail */ ); |
| 1624 | tcp_connection_cleanup (tc); |
| 1625 | return; |
| 1626 | } |
| 1627 | |
| 1628 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
| 1629 | { |
| 1630 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
| 1631 | return; |
| 1632 | } |
| 1633 | |
| 1634 | /* Try without increasing RTO a number of times. If this fails, |
| 1635 | * start growing RTO exponentially */ |
| 1636 | tc->rto_boff += 1; |
| 1637 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1638 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1639 | |
| 1640 | b = vlib_get_buffer (vm, bi); |
| 1641 | tcp_init_buffer (vm, b); |
| 1642 | tcp_make_syn (tc, b); |
| 1643 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1644 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 0); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1645 | |
| 1646 | /* This goes straight to ipx_lookup */ |
| 1647 | tcp_push_ip_hdr (wrk, tc, b); |
| 1648 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
| 1649 | |
| 1650 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 1651 | tc->rto * TCP_TO_TIMER_TICK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1652 | } |
| 1653 | |
| 1654 | /** |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1655 | * Got 0 snd_wnd from peer, try to do something about it. |
| 1656 | * |
| 1657 | */ |
| 1658 | void |
Florin Coras | b72a0ff | 2019-11-22 17:38:25 -0800 | [diff] [blame] | 1659 | tcp_timer_persist_handler (u32 index, u32 thread_index) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1660 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1661 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1662 | u32 bi, max_snd_bytes, available_bytes, offset; |
| 1663 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 1664 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1665 | tcp_connection_t *tc; |
| 1666 | vlib_buffer_t *b; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1667 | int n_bytes = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1668 | u8 *data; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1669 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1670 | tc = tcp_connection_get_if_valid (index, thread_index); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1671 | if (!tc) |
| 1672 | return; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1673 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1674 | /* Problem already solved or worse */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 1675 | if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss |
| 1676 | || (tc->flags & TCP_CONN_FINSNT)) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1677 | return; |
| 1678 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1679 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1680 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1681 | |
| 1682 | /* Reprogram persist if no new bytes available to send. We may have data |
| 1683 | * next time */ |
| 1684 | if (!available_bytes) |
| 1685 | { |
| 1686 | tcp_persist_timer_set (tc); |
| 1687 | return; |
| 1688 | } |
| 1689 | |
| 1690 | if (available_bytes <= offset) |
| 1691 | { |
| 1692 | ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)); |
| 1693 | return; |
| 1694 | } |
| 1695 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1696 | /* Increment RTO backoff */ |
| 1697 | tc->rto_boff += 1; |
| 1698 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1699 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1700 | /* |
| 1701 | * Try to force the first unsent segment (or buffer) |
| 1702 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1703 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1704 | { |
| 1705 | tcp_persist_timer_set (tc); |
| 1706 | return; |
| 1707 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1708 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1709 | data = tcp_init_buffer (vm, b); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1710 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1711 | tcp_validate_txf_size (tc, offset); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1712 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 1713 | max_snd_bytes = clib_min (tc->snd_mss, |
| 1714 | tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN); |
| 1715 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1716 | max_snd_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1717 | b->current_length = n_bytes; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1718 | ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) |
| 1719 | || tc->snd_nxt == tc->snd_una_max |
| 1720 | || tc->rto_boff > 1)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1721 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1722 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1723 | { |
| 1724 | tcp_bt_check_app_limited (tc); |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1725 | tcp_bt_track_tx (tc, n_bytes); |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1726 | } |
| 1727 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1728 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, |
| 1729 | /* burst */ 0, /* update_snd_nxt */ 1); |
| 1730 | tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1731 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1732 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1733 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1734 | /* Just sent new data, enable retransmit */ |
| 1735 | tcp_retransmit_timer_update (tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1736 | } |
| 1737 | |
| 1738 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1739 | * Retransmit first unacked segment |
| 1740 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1741 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1742 | tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1743 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1744 | vlib_main_t *vm = wrk->vm; |
| 1745 | vlib_buffer_t *b; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1746 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1747 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1748 | TCP_EVT (TCP_EVT_CC_EVT, tc, 1); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1749 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1750 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1751 | if (!n_bytes) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1752 | return -1; |
| 1753 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1754 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1755 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1756 | |
| 1757 | return 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1758 | } |
| 1759 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1760 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1761 | tcp_transmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1762 | u32 burst_size) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1763 | { |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1764 | u32 offset, n_segs = 0, n_written, bi, available_wnd; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1765 | vlib_main_t *vm = wrk->vm; |
| 1766 | vlib_buffer_t *b = 0; |
| 1767 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1768 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1769 | available_wnd = tc->snd_wnd - offset; |
| 1770 | burst_size = clib_min (burst_size, available_wnd / tc->snd_mss); |
| 1771 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1772 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1773 | tcp_bt_check_app_limited (tc); |
| 1774 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1775 | while (n_segs < burst_size) |
| 1776 | { |
| 1777 | n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); |
| 1778 | if (!n_written) |
| 1779 | goto done; |
| 1780 | |
| 1781 | bi = vlib_get_buffer_index (vm, b); |
| 1782 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1783 | offset += n_written; |
| 1784 | n_segs += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1785 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1786 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1787 | tcp_bt_track_tx (tc, n_written); |
| 1788 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1789 | tc->snd_nxt += n_written; |
| 1790 | tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | done: |
| 1794 | return n_segs; |
| 1795 | } |
| 1796 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1797 | /** |
| 1798 | * Estimate send space using proportional rate reduction (RFC6937) |
| 1799 | */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1800 | int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1801 | tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc) |
| 1802 | { |
| 1803 | u32 pipe, prr_out; |
| 1804 | int space; |
| 1805 | |
| 1806 | pipe = tcp_flight_size (tc); |
| 1807 | prr_out = tc->snd_rxt_bytes + (tc->snd_nxt - tc->snd_congestion); |
| 1808 | |
| 1809 | if (pipe > tc->ssthresh) |
| 1810 | { |
| 1811 | space = ((int) tc->prr_delivered * ((f64) tc->ssthresh / tc->prev_cwnd)) |
| 1812 | - prr_out; |
| 1813 | } |
| 1814 | else |
| 1815 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1816 | int limit; |
| 1817 | limit = clib_max ((int) (tc->prr_delivered - prr_out), 0) + tc->snd_mss; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1818 | space = clib_min (tc->ssthresh - pipe, limit); |
| 1819 | } |
| 1820 | space = clib_max (space, prr_out ? 0 : tc->snd_mss); |
| 1821 | return space; |
| 1822 | } |
| 1823 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1824 | static inline u8 |
| 1825 | tcp_retransmit_should_retry_head (tcp_connection_t * tc, |
| 1826 | sack_scoreboard_t * sb) |
| 1827 | { |
| 1828 | u32 tx_adv_sack = sb->high_sacked - tc->snd_congestion; |
| 1829 | f64 rr = (f64) tc->ssthresh / tc->prev_cwnd; |
| 1830 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1831 | if (tcp_fastrecovery_first (tc)) |
| 1832 | return 1; |
| 1833 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1834 | return (tx_adv_sack > (tc->snd_una - tc->prr_start) * rr); |
| 1835 | } |
| 1836 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1837 | static inline u8 |
| 1838 | tcp_max_tx_deq (tcp_connection_t * tc) |
| 1839 | { |
| 1840 | return (transport_max_tx_dequeue (&tc->connection) |
| 1841 | - (tc->snd_nxt - tc->snd_una)); |
| 1842 | } |
| 1843 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1844 | #define scoreboard_rescue_rxt_valid(_sb, _tc) \ |
| 1845 | (seq_geq (_sb->rescue_rxt, _tc->snd_una) \ |
| 1846 | && seq_leq (_sb->rescue_rxt, _tc->snd_congestion)) |
| 1847 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1848 | /** |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1849 | * Do retransmit with SACKs |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1850 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1851 | static int |
| 1852 | tcp_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1853 | u32 burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1854 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1855 | u32 n_written = 0, offset, max_bytes, n_segs = 0; |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1856 | u8 snd_limited = 0, can_rescue = 0; |
| 1857 | u32 bi, max_deq, burst_bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1858 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1859 | vlib_main_t *vm = wrk->vm; |
| 1860 | vlib_buffer_t *b = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1861 | sack_scoreboard_t *sb; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1862 | int snd_space; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1863 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1864 | ASSERT (tcp_in_cong_recovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1865 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 1866 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1867 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1868 | if (!burst_size) |
| 1869 | { |
| 1870 | tcp_program_retransmit (tc); |
| 1871 | return 0; |
| 1872 | } |
| 1873 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1874 | if (tcp_in_recovery (tc)) |
| 1875 | snd_space = tcp_available_cc_snd_space (tc); |
| 1876 | else |
| 1877 | snd_space = tcp_fastrecovery_prr_snd_space (tc); |
| 1878 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1879 | if (snd_space < tc->snd_mss) |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1880 | goto done; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1881 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1882 | sb = &tc->sack_sb; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1883 | |
| 1884 | /* Check if snd_una is a lost retransmit */ |
Florin Coras | 8a8b05c | 2019-10-16 10:07:39 -0700 | [diff] [blame] | 1885 | if (pool_elts (sb->holes) |
| 1886 | && seq_gt (sb->high_sacked, tc->snd_congestion) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1887 | && tc->rxt_head != tc->snd_una |
| 1888 | && tcp_retransmit_should_retry_head (tc, sb)) |
| 1889 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1890 | max_bytes = clib_min (tc->snd_mss, tc->snd_congestion - tc->snd_una); |
| 1891 | n_written = tcp_prepare_retransmit_segment (wrk, tc, 0, max_bytes, &b); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1892 | if (!n_written) |
| 1893 | { |
| 1894 | tcp_program_retransmit (tc); |
| 1895 | goto done; |
| 1896 | } |
| 1897 | bi = vlib_get_buffer_index (vm, b); |
| 1898 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1899 | n_segs = 1; |
| 1900 | |
| 1901 | tc->rxt_head = tc->snd_una; |
| 1902 | tc->rxt_delivered += n_written; |
| 1903 | tc->prr_delivered += n_written; |
| 1904 | ASSERT (tc->rxt_delivered <= tc->snd_rxt_bytes); |
| 1905 | } |
| 1906 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1907 | tcp_fastrecovery_first_off (tc); |
| 1908 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1909 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1910 | hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); |
| 1911 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1912 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1913 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1914 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1915 | while (snd_space > 0 && n_segs < burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1916 | { |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1917 | hole = scoreboard_next_rxt_hole (sb, hole, max_deq != 0, &can_rescue, |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1918 | &snd_limited); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1919 | if (!hole) |
| 1920 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1921 | /* We are out of lost holes to retransmit so send some new data. */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1922 | if (max_deq > tc->snd_mss) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1923 | { |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1924 | u32 n_segs_new; |
| 1925 | int av_wnd; |
| 1926 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1927 | /* Make sure we don't exceed available window and leave space |
| 1928 | * for one more packet, to avoid zero window acks */ |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1929 | av_wnd = (int) tc->snd_wnd - (tc->snd_nxt - tc->snd_una); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1930 | av_wnd = clib_max (av_wnd - tc->snd_mss, 0); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1931 | snd_space = clib_min (snd_space, av_wnd); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1932 | snd_space = clib_min (max_deq, snd_space); |
| 1933 | burst_size = clib_min (burst_size - n_segs, |
| 1934 | snd_space / tc->snd_mss); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1935 | burst_size = clib_min (burst_size, TCP_RXT_MAX_BURST); |
| 1936 | n_segs_new = tcp_transmit_unsent (wrk, tc, burst_size); |
| 1937 | if (max_deq > n_segs_new * tc->snd_mss) |
| 1938 | tcp_program_retransmit (tc); |
| 1939 | |
| 1940 | n_segs += n_segs_new; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1941 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1942 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1943 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1944 | if (tcp_in_recovery (tc) || !can_rescue |
| 1945 | || scoreboard_rescue_rxt_valid (sb, tc)) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1946 | break; |
| 1947 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1948 | /* If rescue rxt undefined or less than snd_una then one segment of |
| 1949 | * up to SMSS octets that MUST include the highest outstanding |
| 1950 | * unSACKed sequence number SHOULD be returned, and RescueRxt set to |
| 1951 | * RecoveryPoint. HighRxt MUST NOT be updated. |
| 1952 | */ |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1953 | hole = scoreboard_last_hole (sb); |
| 1954 | max_bytes = clib_min (tc->snd_mss, hole->end - hole->start); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1955 | max_bytes = clib_min (max_bytes, snd_space); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1956 | offset = hole->end - tc->snd_una - max_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1957 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1958 | max_bytes, &b); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1959 | if (!n_written) |
| 1960 | goto done; |
| 1961 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1962 | sb->rescue_rxt = tc->snd_congestion; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1963 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1964 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1965 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1966 | break; |
| 1967 | } |
| 1968 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1969 | max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); |
| 1970 | max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; |
| 1971 | if (max_bytes == 0) |
| 1972 | break; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1973 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1974 | offset = sb->high_rxt - tc->snd_una; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1975 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1976 | &b); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1977 | ASSERT (n_written <= snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1978 | |
| 1979 | /* Nothing left to retransmit */ |
| 1980 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1981 | break; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1982 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1983 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1984 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1985 | |
| 1986 | sb->high_rxt += n_written; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1987 | ASSERT (seq_leq (sb->high_rxt, tc->snd_nxt)); |
| 1988 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1989 | snd_space -= n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1990 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1991 | } |
| 1992 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1993 | if (hole) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1994 | tcp_program_retransmit (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1995 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1996 | done: |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1997 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1998 | transport_connection_tx_pacer_reset_bucket (&tc->connection, 0); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1999 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2000 | } |
| 2001 | |
| 2002 | /** |
| 2003 | * Fast retransmit without SACK info |
| 2004 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2005 | static int |
| 2006 | tcp_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 2007 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2008 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 2009 | u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now, max_bytes; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2010 | u32 burst_bytes, sent_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2011 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 2012 | int snd_space, n_segs = 0; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2013 | u8 cc_limited = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2014 | vlib_buffer_t *b; |
| 2015 | |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 2016 | ASSERT (tcp_in_cong_recovery (tc)); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 2017 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2018 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 2019 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2020 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 2021 | if (!burst_size) |
| 2022 | { |
| 2023 | tcp_program_retransmit (tc); |
| 2024 | return 0; |
| 2025 | } |
| 2026 | |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 2027 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2028 | cc_limited = snd_space < burst_bytes; |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 2029 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2030 | if (!tcp_fastrecovery_first (tc)) |
| 2031 | goto send_unsent; |
| 2032 | |
| 2033 | /* RFC 6582: [If a partial ack], retransmit the first unacknowledged |
| 2034 | * segment. */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 2035 | while (snd_space > 0 && n_segs < burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2036 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 2037 | max_bytes = clib_min (tc->snd_mss, |
| 2038 | tc->snd_congestion - tc->snd_una - offset); |
| 2039 | if (!max_bytes) |
| 2040 | break; |
| 2041 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 2042 | &b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2043 | |
| 2044 | /* Nothing left to retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2045 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2046 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2047 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 2048 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2049 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 2050 | snd_space -= n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2051 | offset += n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 2052 | n_segs += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2053 | } |
| 2054 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2055 | if (n_segs == burst_size) |
| 2056 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 2057 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2058 | send_unsent: |
| 2059 | |
| 2060 | /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */ |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame] | 2061 | if (snd_space < tc->snd_mss || tc->snd_mss == 0) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2062 | goto done; |
| 2063 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 2064 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 2065 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2066 | if (max_deq) |
| 2067 | { |
| 2068 | snd_space = clib_min (max_deq, snd_space); |
| 2069 | burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2070 | n_segs_now = tcp_transmit_unsent (wrk, tc, burst_size); |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 2071 | if (n_segs_now && max_deq > n_segs_now * tc->snd_mss) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2072 | tcp_program_retransmit (tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2073 | n_segs += n_segs_now; |
| 2074 | } |
| 2075 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 2076 | done: |
| 2077 | tcp_fastrecovery_first_off (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 2078 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2079 | sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes); |
| 2080 | sent_bytes = cc_limited ? burst_bytes : sent_bytes; |
| 2081 | transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes); |
| 2082 | |
| 2083 | return n_segs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2084 | } |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2085 | |
| 2086 | static int |
| 2087 | tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size) |
| 2088 | { |
| 2089 | int j, n_acks; |
| 2090 | |
| 2091 | if (!tc->pending_dupacks) |
| 2092 | { |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 2093 | if (tcp_in_cong_recovery (tc) || !tcp_max_tx_deq (tc) |
| 2094 | || tc->state != TCP_STATE_ESTABLISHED) |
| 2095 | { |
| 2096 | tcp_send_ack (tc); |
| 2097 | return 1; |
| 2098 | } |
| 2099 | return 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2100 | } |
| 2101 | |
| 2102 | /* If we're supposed to send dupacks but have no ooo data |
| 2103 | * send only one ack */ |
| 2104 | if (!vec_len (tc->snd_sacks)) |
| 2105 | { |
| 2106 | tcp_send_ack (tc); |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 2107 | tc->pending_dupacks = 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2108 | return 1; |
| 2109 | } |
| 2110 | |
| 2111 | /* Start with first sack block */ |
| 2112 | tc->snd_sack_pos = 0; |
| 2113 | |
| 2114 | /* Generate enough dupacks to cover all sack blocks. Do not generate |
| 2115 | * more sacks than the number of packets received. But do generate at |
| 2116 | * least 3, i.e., the number needed to signal congestion, if needed. */ |
| 2117 | n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS; |
| 2118 | n_acks = clib_min (n_acks, tc->pending_dupacks); |
| 2119 | n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3)); |
| 2120 | for (j = 0; j < clib_min (n_acks, max_burst_size); j++) |
| 2121 | tcp_send_ack (tc); |
| 2122 | |
| 2123 | if (n_acks < max_burst_size) |
| 2124 | { |
| 2125 | tc->pending_dupacks = 0; |
| 2126 | tc->snd_sack_pos = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2127 | tc->dupacks_out += n_acks; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2128 | return n_acks; |
| 2129 | } |
| 2130 | else |
| 2131 | { |
| 2132 | TCP_DBG ("constrained by burst size"); |
| 2133 | tc->pending_dupacks = n_acks - max_burst_size; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2134 | tc->dupacks_out += max_burst_size; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2135 | tcp_program_dupack (tc); |
| 2136 | return max_burst_size; |
| 2137 | } |
| 2138 | } |
| 2139 | |
| 2140 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2141 | tcp_do_retransmit (tcp_connection_t * tc, u32 max_burst_size) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2142 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2143 | tcp_worker_ctx_t *wrk; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2144 | u32 n_segs; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2145 | |
Florin Coras | fd4c3fe | 2019-11-07 12:33:12 -0800 | [diff] [blame] | 2146 | if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED)) |
| 2147 | return 0; |
| 2148 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2149 | wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2150 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2151 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 2152 | n_segs = tcp_retransmit_sack (wrk, tc, max_burst_size); |
| 2153 | else |
| 2154 | n_segs = tcp_retransmit_no_sack (wrk, tc, max_burst_size); |
| 2155 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2156 | return n_segs; |
| 2157 | } |
| 2158 | |
| 2159 | int |
| 2160 | tcp_session_custom_tx (void *conn, u32 max_burst_size) |
| 2161 | { |
| 2162 | tcp_connection_t *tc = (tcp_connection_t *) conn; |
| 2163 | u32 n_segs = 0; |
| 2164 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2165 | if (tcp_in_cong_recovery (tc) && (tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2166 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2167 | tc->flags &= ~TCP_CONN_RXT_PENDING; |
| 2168 | n_segs = tcp_do_retransmit (tc, max_burst_size); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2169 | max_burst_size -= n_segs; |
| 2170 | } |
| 2171 | |
| 2172 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 2173 | return n_segs; |
| 2174 | |
| 2175 | tc->flags &= ~TCP_CONN_SNDACK; |
| 2176 | |
| 2177 | /* We have retransmitted packets and no dupack */ |
| 2178 | if (n_segs && !tc->pending_dupacks) |
| 2179 | return n_segs; |
| 2180 | |
| 2181 | if (!max_burst_size) |
| 2182 | { |
| 2183 | tcp_program_ack (tc); |
| 2184 | return max_burst_size; |
| 2185 | } |
| 2186 | |
| 2187 | n_segs += tcp_send_acks (tc, max_burst_size); |
| 2188 | |
| 2189 | return n_segs; |
| 2190 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2191 | #endif /* CLIB_MARCH_VARIANT */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2192 | |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2193 | static void |
| 2194 | tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0, |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2195 | u16 * next0, u32 * error0) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2196 | { |
| 2197 | ip_adjacency_t *adj; |
| 2198 | adj_index_t ai; |
| 2199 | |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2200 | /* Not thread safe but as long as the connection exists the adj should |
| 2201 | * not be removed */ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2202 | ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, |
| 2203 | tc0->sw_if_index); |
| 2204 | if (ai == ADJ_INDEX_INVALID) |
| 2205 | { |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2206 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
| 2207 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2208 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2209 | return; |
| 2210 | } |
| 2211 | |
| 2212 | adj = adj_get (ai); |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2213 | if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2214 | *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; |
| 2215 | else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) |
| 2216 | *next0 = TCP_OUTPUT_NEXT_IP_ARP; |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2217 | else |
| 2218 | { |
| 2219 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2220 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2221 | } |
| 2222 | vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2223 | } |
| 2224 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2225 | static void |
| 2226 | tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2227 | u32 * to_next, u32 n_bufs) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2228 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2229 | u32 n_trace = vlib_get_trace_count (vm, node); |
| 2230 | tcp_connection_t *tc; |
| 2231 | tcp_tx_trace_t *t; |
| 2232 | vlib_buffer_t *b; |
| 2233 | tcp_header_t *th; |
| 2234 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2235 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2236 | for (i = 0; i < clib_min (n_trace, n_bufs); i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2237 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2238 | b = vlib_get_buffer (vm, to_next[i]); |
| 2239 | th = vlib_buffer_get_current (b); |
| 2240 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2241 | vm->thread_index); |
| 2242 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2243 | clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header)); |
| 2244 | clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2245 | } |
| 2246 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2247 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2248 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2249 | tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, |
| 2250 | tcp_connection_t * tc0, u8 is_ip4) |
| 2251 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2252 | TCP_EVT (TCP_EVT_OUTPUT, tc0, |
| 2253 | ((tcp_header_t *) vlib_buffer_get_current (b0))->flags, |
| 2254 | b0->current_length); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 2255 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2256 | if (is_ip4) |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2257 | vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4, |
| 2258 | IP_PROTOCOL_TCP, tcp_csum_offload (tc0)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2259 | else |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2260 | vlib_buffer_push_ip6_custom (vm, b0, &tc0->c_lcl_ip6, &tc0->c_rmt_ip6, |
| 2261 | IP_PROTOCOL_TCP, tc0->ipv6_flow_label); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2262 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2263 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2264 | always_inline void |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2265 | tcp_check_if_gso (tcp_connection_t * tc, vlib_buffer_t * b) |
| 2266 | { |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2267 | if (PREDICT_TRUE (!(tc->cfg_flags & TCP_CFG_F_TSO))) |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2268 | return; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2269 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2270 | u16 data_len = b->current_length - sizeof (tcp_header_t) - tc->snd_opts_len; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2271 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2272 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)) |
| 2273 | data_len += b->total_length_not_including_first_buffer; |
| 2274 | |
| 2275 | if (PREDICT_TRUE (data_len <= tc->snd_mss)) |
| 2276 | return; |
| 2277 | else |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2278 | { |
| 2279 | ASSERT ((b->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID) != 0); |
| 2280 | ASSERT ((b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID) != 0); |
| 2281 | b->flags |= VNET_BUFFER_F_GSO; |
| 2282 | vnet_buffer2 (b)->gso_l4_hdr_sz = |
| 2283 | sizeof (tcp_header_t) + tc->snd_opts_len; |
| 2284 | vnet_buffer2 (b)->gso_size = tc->snd_mss; |
| 2285 | } |
| 2286 | } |
| 2287 | |
| 2288 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2289 | tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2290 | vlib_node_runtime_t * error_node, u16 * next0, |
| 2291 | u8 is_ip4) |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2292 | { |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2293 | /* If next_index is not drop use it */ |
Florin Coras | 07beade | 2019-06-20 12:18:31 -0700 | [diff] [blame] | 2294 | if (tc0->next_node_index) |
| 2295 | { |
| 2296 | *next0 = tc0->next_node_index; |
| 2297 | vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque; |
| 2298 | } |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2299 | else |
| 2300 | { |
| 2301 | *next0 = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2302 | } |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2303 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2304 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; |
| 2305 | vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; |
| 2306 | |
| 2307 | if (!is_ip4) |
| 2308 | { |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2309 | u32 error0 = 0; |
| 2310 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2311 | if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6))) |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2312 | tcp_output_handle_link_local (tc0, b0, next0, &error0); |
| 2313 | |
| 2314 | if (PREDICT_FALSE (error0)) |
| 2315 | { |
| 2316 | b0->error = error_node->errors[error0]; |
| 2317 | return; |
| 2318 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2319 | } |
| 2320 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2321 | if (!TCP_ALWAYS_ACK) |
| 2322 | tcp_timer_reset (tc0, TCP_TIMER_DELACK); |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2323 | |
| 2324 | tc0->segs_out += 1; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2325 | } |
| 2326 | |
| 2327 | always_inline uword |
| 2328 | tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2329 | vlib_frame_t * frame, int is_ip4) |
| 2330 | { |
| 2331 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2332 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2333 | u16 nexts[VLIB_FRAME_SIZE], *next; |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2334 | vlib_node_runtime_t *error_node; |
| 2335 | |
| 2336 | error_node = vlib_node_get_runtime (vm, tcp_node_index (output, is_ip4)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2337 | |
| 2338 | from = vlib_frame_vector_args (frame); |
| 2339 | n_left_from = frame->n_vectors; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2340 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2341 | |
| 2342 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2343 | tcp46_output_trace_frame (vm, node, from, n_left_from); |
| 2344 | |
| 2345 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2346 | b = bufs; |
| 2347 | next = nexts; |
| 2348 | |
| 2349 | while (n_left_from >= 4) |
| 2350 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2351 | tcp_connection_t *tc0, *tc1; |
| 2352 | |
| 2353 | { |
| 2354 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2355 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2356 | |
| 2357 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2358 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2359 | } |
| 2360 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2361 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2362 | thread_index); |
| 2363 | tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index, |
| 2364 | thread_index); |
| 2365 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2366 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 2367 | { |
| 2368 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2369 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2370 | |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2371 | tcp_check_if_gso (tc0, b[0]); |
| 2372 | tcp_check_if_gso (tc1, b[1]); |
| 2373 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2374 | tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4); |
| 2375 | tcp_output_handle_packet (tc1, b[1], error_node, &next[1], is_ip4); |
| 2376 | } |
| 2377 | else |
| 2378 | { |
| 2379 | if (tc0 != 0) |
| 2380 | { |
| 2381 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2382 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2383 | tcp_output_handle_packet (tc0, b[0], error_node, &next[0], |
| 2384 | is_ip4); |
| 2385 | } |
| 2386 | else |
| 2387 | { |
| 2388 | b[0]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION]; |
| 2389 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2390 | } |
| 2391 | if (tc1 != 0) |
| 2392 | { |
| 2393 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2394 | tcp_check_if_gso (tc1, b[1]); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2395 | tcp_output_handle_packet (tc1, b[1], error_node, &next[1], |
| 2396 | is_ip4); |
| 2397 | } |
| 2398 | else |
| 2399 | { |
| 2400 | b[1]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION]; |
| 2401 | next[1] = TCP_OUTPUT_NEXT_DROP; |
| 2402 | } |
| 2403 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2404 | |
| 2405 | b += 2; |
| 2406 | next += 2; |
| 2407 | n_left_from -= 2; |
| 2408 | } |
| 2409 | while (n_left_from > 0) |
| 2410 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2411 | tcp_connection_t *tc0; |
| 2412 | |
| 2413 | if (n_left_from > 1) |
| 2414 | { |
Florin Coras | 91ca462 | 2018-06-30 11:27:59 -0700 | [diff] [blame] | 2415 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2416 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2417 | } |
| 2418 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2419 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2420 | thread_index); |
| 2421 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2422 | if (PREDICT_TRUE (tc0 != 0)) |
| 2423 | { |
| 2424 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2425 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2426 | tcp_output_handle_packet (tc0, b[0], error_node, &next[0], is_ip4); |
| 2427 | } |
| 2428 | else |
| 2429 | { |
| 2430 | b[0]->error = error_node->errors[TCP_ERROR_INVALID_CONNECTION]; |
| 2431 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2432 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2433 | |
| 2434 | b += 1; |
| 2435 | next += 1; |
| 2436 | n_left_from -= 1; |
| 2437 | } |
| 2438 | |
| 2439 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2440 | vlib_node_increment_counter (vm, tcp_node_index (output, is_ip4), |
| 2441 | TCP_ERROR_PKTS_SENT, frame->n_vectors); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2442 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2443 | } |
| 2444 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2445 | VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2446 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2447 | { |
| 2448 | return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2449 | } |
| 2450 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2451 | VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2452 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2453 | { |
| 2454 | return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2455 | } |
| 2456 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2457 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2458 | VLIB_REGISTER_NODE (tcp4_output_node) = |
| 2459 | { |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2460 | .name = "tcp4-output", |
| 2461 | /* Takes a vector of packets. */ |
| 2462 | .vector_size = sizeof (u32), |
| 2463 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2464 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2465 | .error_strings = tcp_error_strings, |
| 2466 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2467 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2468 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2469 | foreach_tcp4_output_next |
| 2470 | #undef _ |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2471 | }, |
| 2472 | .format_buffer = format_tcp_header, |
| 2473 | .format_trace = format_tcp_tx_trace, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2474 | }; |
| 2475 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2476 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2477 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2478 | VLIB_REGISTER_NODE (tcp6_output_node) = |
| 2479 | { |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2480 | .name = "tcp6-output", |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2481 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2482 | .vector_size = sizeof (u32), |
| 2483 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2484 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2485 | .error_strings = tcp_error_strings, |
| 2486 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2487 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2488 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2489 | foreach_tcp6_output_next |
| 2490 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2491 | }, |
| 2492 | .format_buffer = format_tcp_header, |
| 2493 | .format_trace = format_tcp_tx_trace, |
| 2494 | }; |
| 2495 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2496 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2497 | typedef enum _tcp_reset_next |
| 2498 | { |
| 2499 | TCP_RESET_NEXT_DROP, |
| 2500 | TCP_RESET_NEXT_IP_LOOKUP, |
| 2501 | TCP_RESET_N_NEXT |
| 2502 | } tcp_reset_next_t; |
| 2503 | |
| 2504 | #define foreach_tcp4_reset_next \ |
| 2505 | _(DROP, "error-drop") \ |
| 2506 | _(IP_LOOKUP, "ip4-lookup") |
| 2507 | |
| 2508 | #define foreach_tcp6_reset_next \ |
| 2509 | _(DROP, "error-drop") \ |
| 2510 | _(IP_LOOKUP, "ip6-lookup") |
| 2511 | |
| 2512 | static uword |
| 2513 | tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2514 | vlib_frame_t * from_frame, u8 is_ip4) |
| 2515 | { |
| 2516 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2517 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2518 | |
| 2519 | from = vlib_frame_vector_args (from_frame); |
| 2520 | n_left_from = from_frame->n_vectors; |
| 2521 | |
| 2522 | next_index = node->cached_next_index; |
| 2523 | |
| 2524 | while (n_left_from > 0) |
| 2525 | { |
| 2526 | u32 n_left_to_next; |
| 2527 | |
| 2528 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2529 | |
| 2530 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2531 | { |
| 2532 | u32 bi0; |
| 2533 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2534 | tcp_tx_trace_t *t0; |
| 2535 | tcp_header_t *th0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2536 | u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2537 | |
| 2538 | bi0 = from[0]; |
| 2539 | to_next[0] = bi0; |
| 2540 | from += 1; |
| 2541 | to_next += 1; |
| 2542 | n_left_from -= 1; |
| 2543 | n_left_to_next -= 1; |
| 2544 | |
| 2545 | b0 = vlib_get_buffer (vm, bi0); |
| 2546 | |
| 2547 | if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags, |
| 2548 | my_thread_index, is_ip4)) |
| 2549 | { |
| 2550 | error0 = TCP_ERROR_LOOKUP_DROPS; |
| 2551 | next0 = TCP_RESET_NEXT_DROP; |
| 2552 | goto done; |
| 2553 | } |
| 2554 | |
| 2555 | /* Prepare to send to IP lookup */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 2556 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2557 | next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2558 | |
| 2559 | done: |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2560 | b0->error = node->errors[error0]; |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 2561 | b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2562 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2563 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2564 | th0 = vlib_buffer_get_current (b0); |
| 2565 | if (is_ip4) |
| 2566 | th0 = ip4_next_header ((ip4_header_t *) th0); |
| 2567 | else |
| 2568 | th0 = ip6_next_header ((ip6_header_t *) th0); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2569 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2570 | clib_memcpy_fast (&t0->tcp_header, th0, |
| 2571 | sizeof (t0->tcp_header)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2572 | } |
| 2573 | |
| 2574 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2575 | n_left_to_next, bi0, next0); |
| 2576 | } |
| 2577 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2578 | } |
| 2579 | return from_frame->n_vectors; |
| 2580 | } |
| 2581 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2582 | VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2583 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2584 | { |
| 2585 | return tcp46_send_reset_inline (vm, node, from_frame, 1); |
| 2586 | } |
| 2587 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2588 | VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2589 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2590 | { |
| 2591 | return tcp46_send_reset_inline (vm, node, from_frame, 0); |
| 2592 | } |
| 2593 | |
| 2594 | /* *INDENT-OFF* */ |
| 2595 | VLIB_REGISTER_NODE (tcp4_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2596 | .name = "tcp4-reset", |
| 2597 | .vector_size = sizeof (u32), |
| 2598 | .n_errors = TCP_N_ERROR, |
| 2599 | .error_strings = tcp_error_strings, |
| 2600 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2601 | .next_nodes = { |
| 2602 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2603 | foreach_tcp4_reset_next |
| 2604 | #undef _ |
| 2605 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2606 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2607 | }; |
| 2608 | /* *INDENT-ON* */ |
| 2609 | |
| 2610 | /* *INDENT-OFF* */ |
| 2611 | VLIB_REGISTER_NODE (tcp6_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2612 | .name = "tcp6-reset", |
| 2613 | .vector_size = sizeof (u32), |
| 2614 | .n_errors = TCP_N_ERROR, |
| 2615 | .error_strings = tcp_error_strings, |
| 2616 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2617 | .next_nodes = { |
| 2618 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2619 | foreach_tcp6_reset_next |
| 2620 | #undef _ |
| 2621 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2622 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2623 | }; |
| 2624 | /* *INDENT-ON* */ |
| 2625 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2626 | /* |
| 2627 | * fd.io coding-style-patch-verification: ON |
| 2628 | * |
| 2629 | * Local Variables: |
| 2630 | * eval: (c-set-style "gnu") |
| 2631 | * End: |
| 2632 | */ |