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 | * Update max segment size we're able to process. |
| 80 | * |
| 81 | * The value is constrained by our interface's MTU and IP options. It is |
| 82 | * also what we advertise to our peer. |
| 83 | */ |
| 84 | void |
| 85 | tcp_update_rcv_mss (tcp_connection_t * tc) |
| 86 | { |
| 87 | /* TODO find our iface MTU */ |
Florin Coras | 537e85d | 2019-03-22 15:42:18 -0700 | [diff] [blame] | 88 | tc->mss = tcp_main.default_mtu - sizeof (tcp_header_t); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | /** |
| 92 | * TCP's initial window |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 93 | */ |
| 94 | always_inline u32 |
| 95 | tcp_initial_wnd_unscaled (tcp_connection_t * tc) |
| 96 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 97 | /* RFC 6928 recommends the value lower. However at the time our connections |
| 98 | * are initialized, fifos may not be allocated. Therefore, advertise the |
| 99 | * smallest possible unscaled window size and update once fifos are |
| 100 | * assigned to the session. |
| 101 | */ |
| 102 | /* |
| 103 | tcp_update_rcv_mss (tc); |
| 104 | TCP_IW_N_SEGMENTS * tc->mss; |
| 105 | */ |
| 106 | return TCP_MIN_RX_FIFO_SIZE; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 110 | * Compute initial window and scale factor. As per RFC1323, window field in |
| 111 | * SYN and SYN-ACK segments is never scaled. |
| 112 | */ |
| 113 | u32 |
| 114 | tcp_initial_window_to_advertise (tcp_connection_t * tc) |
| 115 | { |
Florin Coras | ca03186 | 2018-09-24 13:58:05 -0700 | [diff] [blame] | 116 | tcp_main_t *tm = &tcp_main; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 117 | u32 max_fifo; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 118 | |
| 119 | /* Initial wnd for SYN. Fifos are not allocated yet. |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 120 | * Use some predefined value. For SYN-ACK we still want the |
| 121 | * scale to be computed in the same way */ |
Florin Coras | ca03186 | 2018-09-24 13:58:05 -0700 | [diff] [blame] | 122 | max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 123 | |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 124 | /* Compute rcv wscale only if peer advertised support for it */ |
| 125 | if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts)) |
| 126 | tc->rcv_wscale = tcp_window_compute_scale (max_fifo); |
| 127 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 128 | tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 129 | |
| 130 | return clib_min (tc->rcv_wnd, TCP_WND_MAX); |
| 131 | } |
| 132 | |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 133 | static inline void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 134 | tcp_update_rcv_wnd (tcp_connection_t * tc) |
| 135 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 136 | u32 available_space, wnd; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 137 | i32 observed_wnd; |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 138 | |
| 139 | ASSERT (tc->rcv_opts.mss < transport_rx_fifo_size (&tc->connection)); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 140 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 141 | /* |
| 142 | * Figure out how much space we have available |
| 143 | */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 144 | available_space = transport_max_rx_enqueue (&tc->connection); |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 145 | if (PREDICT_FALSE (available_space < tc->rcv_opts.mss)) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 146 | available_space = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 147 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 148 | /* |
| 149 | * Use the above and what we know about what we've previously advertised |
| 150 | * to compute the new window |
| 151 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 152 | observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 153 | |
| 154 | /* Bad. Thou shalt not shrink */ |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 155 | if (PREDICT_FALSE ((i32) available_space < observed_wnd)) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 156 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 157 | wnd = clib_max (observed_wnd, 0); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 158 | TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 159 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 160 | else |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 161 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 162 | wnd = available_space; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 163 | } |
| 164 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 165 | /* Make sure we have a multiple of rcv_wscale */ |
| 166 | if (wnd && tc->rcv_wscale) |
| 167 | { |
Florin Coras | 679b78f | 2019-03-06 21:16:26 -0800 | [diff] [blame] | 168 | wnd &= ~((1 << tc->rcv_wscale) - 1); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 169 | if (wnd == 0) |
| 170 | wnd = 1 << tc->rcv_wscale; |
| 171 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 172 | |
| 173 | tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /** |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 177 | * Compute and return window to advertise, scaled as per RFC1323 |
| 178 | */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 179 | static inline u32 |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 180 | tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) |
| 181 | { |
| 182 | if (state < TCP_STATE_ESTABLISHED) |
| 183 | return tcp_initial_window_to_advertise (tc); |
| 184 | |
| 185 | tcp_update_rcv_wnd (tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 186 | return tc->rcv_wnd >> tc->rcv_wscale; |
| 187 | } |
| 188 | |
| 189 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 190 | * Write TCP options to segment. |
| 191 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 192 | static u32 |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 193 | tcp_options_write (u8 * data, tcp_options_t * opts) |
| 194 | { |
| 195 | u32 opts_len = 0; |
| 196 | u32 buf, seq_len = 4; |
| 197 | |
| 198 | if (tcp_opts_mss (opts)) |
| 199 | { |
| 200 | *data++ = TCP_OPTION_MSS; |
| 201 | *data++ = TCP_OPTION_LEN_MSS; |
| 202 | buf = clib_host_to_net_u16 (opts->mss); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 203 | clib_memcpy_fast (data, &buf, sizeof (opts->mss)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 204 | data += sizeof (opts->mss); |
| 205 | opts_len += TCP_OPTION_LEN_MSS; |
| 206 | } |
| 207 | |
| 208 | if (tcp_opts_wscale (opts)) |
| 209 | { |
| 210 | *data++ = TCP_OPTION_WINDOW_SCALE; |
| 211 | *data++ = TCP_OPTION_LEN_WINDOW_SCALE; |
| 212 | *data++ = opts->wscale; |
| 213 | opts_len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 214 | } |
| 215 | |
| 216 | if (tcp_opts_sack_permitted (opts)) |
| 217 | { |
| 218 | *data++ = TCP_OPTION_SACK_PERMITTED; |
| 219 | *data++ = TCP_OPTION_LEN_SACK_PERMITTED; |
| 220 | opts_len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 221 | } |
| 222 | |
| 223 | if (tcp_opts_tstamp (opts)) |
| 224 | { |
| 225 | *data++ = TCP_OPTION_TIMESTAMP; |
| 226 | *data++ = TCP_OPTION_LEN_TIMESTAMP; |
| 227 | buf = clib_host_to_net_u32 (opts->tsval); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 228 | clib_memcpy_fast (data, &buf, sizeof (opts->tsval)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 229 | data += sizeof (opts->tsval); |
| 230 | buf = clib_host_to_net_u32 (opts->tsecr); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 231 | clib_memcpy_fast (data, &buf, sizeof (opts->tsecr)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 232 | data += sizeof (opts->tsecr); |
| 233 | opts_len += TCP_OPTION_LEN_TIMESTAMP; |
| 234 | } |
| 235 | |
| 236 | if (tcp_opts_sack (opts)) |
| 237 | { |
| 238 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 239 | |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 240 | if (opts->n_sack_blocks != 0) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 241 | { |
| 242 | *data++ = TCP_OPTION_SACK_BLOCK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 243 | *data++ = 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
| 244 | for (i = 0; i < opts->n_sack_blocks; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 245 | { |
| 246 | buf = clib_host_to_net_u32 (opts->sacks[i].start); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 247 | clib_memcpy_fast (data, &buf, seq_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 248 | data += seq_len; |
| 249 | buf = clib_host_to_net_u32 (opts->sacks[i].end); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 250 | clib_memcpy_fast (data, &buf, seq_len); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 251 | data += seq_len; |
| 252 | } |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 253 | opts_len += 2 + opts->n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 254 | } |
| 255 | } |
| 256 | |
| 257 | /* Terminate TCP options */ |
| 258 | if (opts_len % 4) |
| 259 | { |
| 260 | *data++ = TCP_OPTION_EOL; |
| 261 | opts_len += TCP_OPTION_LEN_EOL; |
| 262 | } |
| 263 | |
| 264 | /* Pad with zeroes to a u32 boundary */ |
| 265 | while (opts_len % 4) |
| 266 | { |
| 267 | *data++ = TCP_OPTION_NOOP; |
| 268 | opts_len += TCP_OPTION_LEN_NOOP; |
| 269 | } |
| 270 | return opts_len; |
| 271 | } |
| 272 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 273 | static int |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 274 | tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 275 | { |
| 276 | u8 len = 0; |
| 277 | |
| 278 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | 537e85d | 2019-03-22 15:42:18 -0700 | [diff] [blame] | 279 | opts->mss = tcp_main.default_mtu; /*XXX discover that */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 280 | len += TCP_OPTION_LEN_MSS; |
| 281 | |
| 282 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 283 | opts->wscale = wnd_scale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 284 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 285 | |
| 286 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 287 | opts->tsval = tcp_time_now (); |
| 288 | opts->tsecr = 0; |
| 289 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 290 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 291 | if (TCP_USE_SACKS) |
| 292 | { |
| 293 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 294 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 295 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 296 | |
| 297 | /* Align to needed boundary */ |
| 298 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 299 | return len; |
| 300 | } |
| 301 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 302 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 303 | tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 304 | { |
| 305 | u8 len = 0; |
| 306 | |
| 307 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 308 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 309 | len += TCP_OPTION_LEN_MSS; |
| 310 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 311 | if (tcp_opts_wscale (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 312 | { |
| 313 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
| 314 | opts->wscale = tc->rcv_wscale; |
| 315 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 316 | } |
| 317 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 318 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 319 | { |
| 320 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 321 | opts->tsval = tcp_time_now (); |
| 322 | opts->tsecr = tc->tsval_recent; |
| 323 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 324 | } |
| 325 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 326 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 327 | { |
| 328 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 329 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 330 | } |
| 331 | |
| 332 | /* Align to needed boundary */ |
| 333 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 334 | return len; |
| 335 | } |
| 336 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 337 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 338 | tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 339 | { |
| 340 | u8 len = 0; |
| 341 | |
| 342 | opts->flags = 0; |
| 343 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 344 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 345 | { |
| 346 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 347 | opts->tsval = tcp_time_now_w_thread (tc->c_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 348 | opts->tsecr = tc->tsval_recent; |
| 349 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 350 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 351 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 352 | { |
| 353 | if (vec_len (tc->snd_sacks)) |
| 354 | { |
| 355 | opts->flags |= TCP_OPTS_FLAG_SACK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 356 | if (tc->snd_sack_pos >= vec_len (tc->snd_sacks)) |
| 357 | tc->snd_sack_pos = 0; |
| 358 | opts->sacks = &tc->snd_sacks[tc->snd_sack_pos]; |
| 359 | opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos; |
| 360 | opts->n_sack_blocks = clib_min (opts->n_sack_blocks, |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 361 | TCP_OPTS_MAX_SACK_BLOCKS); |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 362 | tc->snd_sack_pos += opts->n_sack_blocks; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 363 | len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /* Align to needed boundary */ |
| 368 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 369 | return len; |
| 370 | } |
| 371 | |
| 372 | always_inline int |
| 373 | tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, |
| 374 | tcp_state_t state) |
| 375 | { |
| 376 | switch (state) |
| 377 | { |
| 378 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 379 | case TCP_STATE_CLOSE_WAIT: |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 380 | case TCP_STATE_FIN_WAIT_1: |
| 381 | case TCP_STATE_LAST_ACK: |
| 382 | case TCP_STATE_CLOSING: |
| 383 | case TCP_STATE_FIN_WAIT_2: |
| 384 | case TCP_STATE_TIME_WAIT: |
| 385 | case TCP_STATE_CLOSED: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 386 | return tcp_make_established_options (tc, opts); |
| 387 | case TCP_STATE_SYN_RCVD: |
| 388 | return tcp_make_synack_options (tc, opts); |
| 389 | case TCP_STATE_SYN_SENT: |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 390 | return tcp_make_syn_options (opts, tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 391 | default: |
Florin Coras | 371ca50 | 2018-02-21 12:07:41 -0800 | [diff] [blame] | 392 | clib_warning ("State not handled! %d", state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 393 | return 0; |
| 394 | } |
| 395 | } |
| 396 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 397 | /** |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 398 | * Update burst send vars |
| 399 | * |
| 400 | * - Updates snd_mss to reflect the effective segment size that we can send |
| 401 | * by taking into account all TCP options, including SACKs. |
| 402 | * - Cache 'on the wire' options for reuse |
| 403 | * - Updates receive window which can be reused for a burst. |
| 404 | * |
| 405 | * This should *only* be called when doing bursts |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 406 | */ |
| 407 | void |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 408 | tcp_update_burst_snd_vars (tcp_connection_t * tc) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 409 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 410 | tcp_main_t *tm = &tcp_main; |
| 411 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 412 | /* Compute options to be used for connection. These may be reused when |
| 413 | * sending data or to compute the effective mss (snd_mss) */ |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 414 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, |
| 415 | TCP_STATE_ESTABLISHED); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 416 | |
| 417 | /* XXX check if MTU has been updated */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 418 | 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] | 419 | ASSERT (tc->snd_mss > 0); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 420 | |
| 421 | tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 422 | &tc->snd_opts); |
| 423 | |
| 424 | tcp_update_rcv_wnd (tc); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | void |
| 428 | tcp_init_mss (tcp_connection_t * tc) |
| 429 | { |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 430 | u16 default_min_mss = 536; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 431 | tcp_update_rcv_mss (tc); |
| 432 | |
| 433 | /* TODO cache mss and consider PMTU discovery */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 434 | tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 435 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 436 | if (tc->snd_mss < 45) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 437 | { |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 438 | /* Assume that at least the min default mss works */ |
| 439 | tc->snd_mss = default_min_mss; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 440 | tc->rcv_opts.mss = default_min_mss; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | /* We should have enough space for 40 bytes of options */ |
| 444 | ASSERT (tc->snd_mss > 45); |
| 445 | |
| 446 | /* If we use timestamp option, account for it */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 447 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 448 | tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP; |
| 449 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 450 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 451 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 452 | static void * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 453 | tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 454 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 455 | if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| 456 | vlib_buffer_free_one (vm, b->next_buffer); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 457 | /* Zero all flags but free list index and trace flag */ |
| 458 | b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 459 | b->current_data = 0; |
| 460 | b->current_length = 0; |
| 461 | b->total_length_not_including_first_buffer = 0; |
| 462 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 463 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 464 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 465 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 466 | } |
| 467 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 468 | #ifndef CLIB_MARCH_VARIANT |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 469 | static void * |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 470 | tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 471 | { |
| 472 | ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 473 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 474 | b->total_length_not_including_first_buffer = 0; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 475 | b->current_data = 0; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 476 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 477 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 478 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 479 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | /** |
| 483 | * Prepare ACK |
| 484 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 485 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 486 | tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, |
| 487 | u8 flags) |
| 488 | { |
| 489 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 490 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 491 | tcp_header_t *th; |
| 492 | u16 wnd; |
| 493 | |
| 494 | wnd = tcp_window_to_advertise (tc, state); |
| 495 | |
| 496 | /* Make and write options */ |
| 497 | tcp_opts_len = tcp_make_established_options (tc, snd_opts); |
| 498 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 499 | |
| 500 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 501 | tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd); |
| 502 | |
| 503 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 504 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 505 | } |
| 506 | |
| 507 | /** |
| 508 | * Convert buffer to ACK |
| 509 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 510 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 511 | tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 512 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 513 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 514 | TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 515 | tc->rcv_las = tc->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Convert buffer to FIN-ACK |
| 520 | */ |
| 521 | void |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 522 | tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 523 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 524 | 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] | 525 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 526 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 527 | /** |
| 528 | * Convert buffer to SYN |
| 529 | */ |
| 530 | void |
| 531 | tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) |
| 532 | { |
| 533 | u8 tcp_hdr_opts_len, tcp_opts_len; |
| 534 | tcp_header_t *th; |
| 535 | u16 initial_wnd; |
| 536 | tcp_options_t snd_opts; |
| 537 | |
| 538 | initial_wnd = tcp_initial_window_to_advertise (tc); |
| 539 | |
| 540 | /* Make and write options */ |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 541 | clib_memset (&snd_opts, 0, sizeof (snd_opts)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 542 | tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale); |
| 543 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 544 | |
| 545 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 546 | tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, |
| 547 | initial_wnd); |
| 548 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 549 | tcp_options_write ((u8 *) (th + 1), &snd_opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | /** |
| 553 | * Convert buffer to SYN-ACK |
| 554 | */ |
| 555 | void |
| 556 | tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 557 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 559 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 560 | tcp_header_t *th; |
| 561 | u16 initial_wnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 562 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 563 | clib_memset (snd_opts, 0, sizeof (*snd_opts)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 564 | initial_wnd = tcp_initial_window_to_advertise (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 565 | tcp_opts_len = tcp_make_synack_options (tc, snd_opts); |
| 566 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 567 | |
| 568 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 569 | tc->rcv_nxt, tcp_hdr_opts_len, |
| 570 | TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 571 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
| 572 | |
| 573 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | always_inline void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 577 | 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] | 578 | u8 is_ip4, u32 fib_index, u8 flush) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 579 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 580 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 581 | u32 *to_next, next_index; |
| 582 | vlib_frame_t *f; |
| 583 | |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 584 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 585 | b->error = 0; |
| 586 | |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 587 | vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; |
| 588 | vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 589 | |
| 590 | /* Send to IP lookup */ |
| 591 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 592 | tcp_trajectory_add_start (b, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 593 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 594 | f = wrk->ip_lookup_tx_frames[!is_ip4]; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 595 | if (!f) |
| 596 | { |
| 597 | f = vlib_get_frame_to_node (vm, next_index); |
| 598 | ASSERT (f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 599 | wrk->ip_lookup_tx_frames[!is_ip4] = f; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 600 | } |
| 601 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 602 | to_next = vlib_frame_vector_args (f); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 603 | to_next[f->n_vectors] = bi; |
| 604 | f->n_vectors += 1; |
| 605 | if (flush || f->n_vectors == VLIB_FRAME_SIZE) |
| 606 | { |
| 607 | vlib_put_frame_to_node (vm, next_index, f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 608 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 609 | } |
| 610 | } |
| 611 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 612 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 613 | tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, |
| 614 | u32 bi, u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 615 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 616 | 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] | 617 | } |
| 618 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 619 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 620 | 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] | 621 | u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 622 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 623 | tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0); |
| 624 | if (wrk->vm->thread_index == 0 && vlib_num_workers ()) |
| 625 | session_flush_frames_main_thread (wrk->vm); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 626 | } |
| 627 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 628 | always_inline void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 629 | tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 630 | u8 is_ip4, u8 flush) |
| 631 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 632 | u32 *to_next, next_index; |
| 633 | vlib_frame_t *f; |
| 634 | |
| 635 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| 636 | b->error = 0; |
| 637 | |
| 638 | /* Decide where to send the packet */ |
| 639 | next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 640 | tcp_trajectory_add_start (b, 2); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 641 | |
| 642 | /* Get frame to v4/6 output node */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 643 | f = wrk->tx_frames[!is_ip4]; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 644 | if (!f) |
| 645 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 646 | f = vlib_get_frame_to_node (wrk->vm, next_index); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 647 | ASSERT (f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 648 | wrk->tx_frames[!is_ip4] = f; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 649 | } |
| 650 | to_next = vlib_frame_vector_args (f); |
| 651 | to_next[f->n_vectors] = bi; |
| 652 | f->n_vectors += 1; |
| 653 | if (flush || f->n_vectors == VLIB_FRAME_SIZE) |
| 654 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 655 | vlib_put_frame_to_node (wrk->vm, next_index, f); |
| 656 | wrk->tx_frames[!is_ip4] = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 657 | } |
| 658 | } |
| 659 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 660 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 661 | tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 662 | u8 is_ip4) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 663 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 664 | tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 665 | } |
| 666 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 667 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 668 | tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 669 | u8 is_ip4) |
| 670 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 671 | tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 672 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 673 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 674 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 675 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 676 | 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] | 677 | tcp_state_t state, u8 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 678 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 679 | ip4_header_t *ih4; |
| 680 | ip6_header_t *ih6; |
| 681 | tcp_header_t *th0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 682 | ip4_address_t src_ip40, dst_ip40; |
| 683 | ip6_address_t src_ip60, dst_ip60; |
| 684 | u16 src_port, dst_port; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 685 | u32 tmp; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 686 | u32 seq, ack; |
| 687 | u8 flags; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 688 | |
| 689 | /* Find IP and TCP headers */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 690 | th0 = tcp_buffer_hdr (b0); |
| 691 | |
| 692 | /* Save src and dst ip */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 693 | if (is_ip4) |
| 694 | { |
| 695 | ih4 = vlib_buffer_get_current (b0); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 696 | ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 697 | src_ip40.as_u32 = ih4->src_address.as_u32; |
| 698 | dst_ip40.as_u32 = ih4->dst_address.as_u32; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 699 | } |
| 700 | else |
| 701 | { |
| 702 | ih6 = vlib_buffer_get_current (b0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 703 | ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 704 | clib_memcpy_fast (&src_ip60, &ih6->src_address, sizeof (ip6_address_t)); |
| 705 | clib_memcpy_fast (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 706 | } |
| 707 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 708 | src_port = th0->src_port; |
| 709 | dst_port = th0->dst_port; |
| 710 | |
| 711 | /* Try to determine what/why we're actually resetting */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 712 | if (state == TCP_STATE_CLOSED) |
| 713 | { |
| 714 | if (!tcp_syn (th0)) |
| 715 | return -1; |
| 716 | |
| 717 | tmp = clib_net_to_host_u32 (th0->seq_number); |
| 718 | |
| 719 | /* Got a SYN for no listener. */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 720 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 721 | ack = clib_host_to_net_u32 (tmp + 1); |
| 722 | seq = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 723 | } |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 724 | else |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 725 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 726 | flags = TCP_FLAG_RST; |
| 727 | seq = th0->ack_number; |
| 728 | ack = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 729 | } |
| 730 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 731 | tcp_reuse_buffer (vm, b0); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 732 | tcp_trajectory_add_start (b0, 4); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 733 | th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack, |
| 734 | sizeof (tcp_header_t), flags, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 735 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 736 | if (is_ip4) |
| 737 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 738 | ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 739 | IP_PROTOCOL_TCP, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 740 | th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4); |
| 741 | } |
| 742 | else |
| 743 | { |
| 744 | int bogus = ~0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 745 | ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60, |
| 746 | IP_PROTOCOL_TCP); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 747 | th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus); |
| 748 | ASSERT (!bogus); |
| 749 | } |
| 750 | |
| 751 | return 0; |
| 752 | } |
| 753 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 754 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 755 | /** |
| 756 | * Send reset without reusing existing buffer |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 757 | * |
| 758 | * It extracts connection info out of original packet |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 759 | */ |
| 760 | void |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 761 | tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, |
| 762 | u32 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 763 | { |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 764 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 765 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 766 | vlib_buffer_t *b; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 767 | u32 bi, sw_if_index, fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 768 | u8 tcp_hdr_len, flags = 0; |
| 769 | tcp_header_t *th, *pkt_th; |
| 770 | u32 seq, ack; |
| 771 | ip4_header_t *ih4, *pkt_ih4; |
| 772 | ip6_header_t *ih6, *pkt_ih6; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 773 | fib_protocol_t fib_proto; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 774 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 775 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 776 | return; |
| 777 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 778 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 779 | sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; |
| 780 | fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| 781 | 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] | 782 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 783 | |
| 784 | /* Make and write options */ |
| 785 | tcp_hdr_len = sizeof (tcp_header_t); |
| 786 | |
| 787 | if (is_ip4) |
| 788 | { |
| 789 | pkt_ih4 = vlib_buffer_get_current (pkt); |
| 790 | pkt_th = ip4_next_header (pkt_ih4); |
| 791 | } |
| 792 | else |
| 793 | { |
| 794 | pkt_ih6 = vlib_buffer_get_current (pkt); |
| 795 | pkt_th = ip6_next_header (pkt_ih6); |
| 796 | } |
| 797 | |
| 798 | if (tcp_ack (pkt_th)) |
| 799 | { |
| 800 | flags = TCP_FLAG_RST; |
| 801 | seq = pkt_th->ack_number; |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 802 | ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 803 | } |
| 804 | else |
| 805 | { |
| 806 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 807 | seq = 0; |
| 808 | ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end); |
| 809 | } |
| 810 | |
| 811 | th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port, |
| 812 | seq, ack, tcp_hdr_len, flags, 0); |
| 813 | |
| 814 | /* Swap src and dst ip */ |
| 815 | if (is_ip4) |
| 816 | { |
| 817 | ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 818 | ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 819 | &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 820 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 821 | } |
| 822 | else |
| 823 | { |
| 824 | int bogus = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 825 | ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) == |
| 826 | 0x60); |
root | c9d1c5b | 2017-08-15 12:58:31 -0400 | [diff] [blame] | 827 | ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address, |
| 828 | &pkt_ih6->src_address, IP_PROTOCOL_TCP); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 829 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 830 | ASSERT (!bogus); |
| 831 | } |
| 832 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 833 | tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 834 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 835 | } |
| 836 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 837 | /** |
| 838 | * Build and set reset packet for connection |
| 839 | */ |
| 840 | void |
| 841 | tcp_send_reset (tcp_connection_t * tc) |
| 842 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 843 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 844 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 845 | vlib_buffer_t *b; |
| 846 | u32 bi; |
| 847 | tcp_header_t *th; |
| 848 | u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; |
| 849 | u8 flags; |
| 850 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 851 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 852 | return; |
| 853 | b = vlib_get_buffer (vm, bi); |
| 854 | tcp_init_buffer (vm, b); |
| 855 | |
| 856 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 857 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
| 858 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
| 859 | flags = TCP_FLAG_RST; |
| 860 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 861 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 862 | advertise_wnd); |
| 863 | opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 864 | ASSERT (opts_write_len == tc->snd_opts_len); |
| 865 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 866 | if (tc->c_is_ip4) |
| 867 | { |
| 868 | ip4_header_t *ih4; |
| 869 | ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4, |
| 870 | &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0); |
| 871 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 872 | } |
| 873 | else |
| 874 | { |
| 875 | int bogus = ~0; |
| 876 | ip6_header_t *ih6; |
| 877 | ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6, |
| 878 | &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP); |
| 879 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 880 | ASSERT (!bogus); |
| 881 | } |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 882 | tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 883 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 886 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 887 | tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 888 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 889 | { |
| 890 | tcp_header_t *th = vlib_buffer_get_current (b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 891 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 892 | if (tc->c_is_ip4) |
| 893 | { |
| 894 | ip4_header_t *ih; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 895 | ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 896 | &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 897 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 898 | } |
| 899 | else |
| 900 | { |
| 901 | ip6_header_t *ih; |
| 902 | int bogus = ~0; |
| 903 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 904 | ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 905 | &tc->c_rmt_ip6, IP_PROTOCOL_TCP); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 906 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 907 | ASSERT (!bogus); |
| 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 | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 930 | tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 931 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 932 | tc->rto * TCP_TO_TIMER_TICK); |
| 933 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 934 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 935 | { |
| 936 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
| 937 | return; |
| 938 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 939 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 940 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 941 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 942 | tcp_make_syn (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 943 | |
| 944 | /* Measure RTT with this */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 945 | tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 946 | tc->rtt_seq = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 947 | tc->rto_boff = 0; |
| 948 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 949 | tcp_push_ip_hdr (wrk, tc, b); |
| 950 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 951 | TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 952 | } |
| 953 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 954 | void |
| 955 | tcp_send_synack (tcp_connection_t * tc) |
| 956 | { |
| 957 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 958 | vlib_main_t *vm = wrk->vm; |
| 959 | vlib_buffer_t *b; |
| 960 | u32 bi; |
| 961 | |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 962 | tcp_retransmit_timer_force_update (tc); |
| 963 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 964 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 965 | { |
| 966 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
| 967 | return; |
| 968 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 969 | |
Florin Coras | df08478 | 2018-12-06 17:41:10 -0800 | [diff] [blame] | 970 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 971 | b = vlib_get_buffer (vm, bi); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 972 | tcp_init_buffer (vm, b); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 973 | tcp_make_synack (tc, b); |
| 974 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 975 | TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 976 | } |
| 977 | |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 978 | /** |
| 979 | * Flush tx frame populated by retransmits and timer pops |
| 980 | */ |
| 981 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 982 | tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 983 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 984 | if (wrk->tx_frames[!is_ip4]) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 985 | { |
| 986 | u32 next_index; |
| 987 | next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 988 | vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]); |
| 989 | wrk->tx_frames[!is_ip4] = 0; |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 990 | } |
| 991 | } |
| 992 | |
| 993 | /** |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 994 | * Flush ip lookup tx frames populated by timer pops |
| 995 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 996 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 997 | 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] | 998 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 999 | if (wrk->ip_lookup_tx_frames[!is_ip4]) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1000 | { |
| 1001 | u32 next_index; |
| 1002 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1003 | vlib_put_frame_to_node (wrk->vm, next_index, |
| 1004 | wrk->ip_lookup_tx_frames[!is_ip4]); |
| 1005 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | /** |
| 1010 | * 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] | 1011 | */ |
| 1012 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1013 | tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1014 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1015 | tcp_flush_frame_to_output (wrk, 1); |
| 1016 | tcp_flush_frame_to_output (wrk, 0); |
| 1017 | tcp_flush_frame_to_ip_lookup (wrk, 1); |
| 1018 | tcp_flush_frame_to_ip_lookup (wrk, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | /** |
| 1022 | * Send FIN |
| 1023 | */ |
| 1024 | void |
| 1025 | tcp_send_fin (tcp_connection_t * tc) |
| 1026 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1027 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1028 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1029 | vlib_buffer_t *b; |
| 1030 | u32 bi; |
| 1031 | u8 fin_snt = 0; |
| 1032 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1033 | fin_snt = tc->flags & TCP_CONN_FINSNT; |
| 1034 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1035 | tc->snd_nxt -= 1; |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1036 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1037 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1038 | { |
| 1039 | /* Out of buffers so program fin retransmit ASAP */ |
| 1040 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1041 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1042 | tc->snd_nxt += 1; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1043 | else |
| 1044 | /* Make sure retransmit retries a fin not data */ |
| 1045 | tc->flags |= TCP_CONN_FINSNT; |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1046 | return; |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1047 | } |
| 1048 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1049 | tcp_retransmit_timer_force_update (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1050 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1051 | tcp_init_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1052 | tcp_make_fin (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1053 | tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1054 | TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1055 | /* Account for the FIN */ |
| 1056 | tc->snd_nxt += 1; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1057 | if (!fin_snt) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1058 | { |
| 1059 | tc->flags |= TCP_CONN_FINSNT; |
| 1060 | tc->flags &= ~TCP_CONN_FINPNDG; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1061 | 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] | 1062 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1063 | } |
| 1064 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1065 | /** |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 1066 | * Push TCP header and update connection variables. Should only be called |
| 1067 | * for segments with data, not for 'control' packets. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1068 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1069 | always_inline void |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1070 | tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt, |
| 1071 | u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1072 | { |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 1073 | u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1074 | u32 advertise_wnd, data_len; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1075 | tcp_main_t *tm = &tcp_main; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1076 | tcp_header_t *th; |
| 1077 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1078 | data_len = b->current_length; |
| 1079 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1080 | data_len += b->total_length_not_including_first_buffer; |
| 1081 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1082 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1083 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1084 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1085 | if (compute_opts) |
| 1086 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1087 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1088 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1089 | |
| 1090 | if (maybe_burst) |
| 1091 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
| 1092 | else |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1093 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1094 | |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 1095 | if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) |
| 1096 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1097 | if (seq_geq (tc->psh_seq, snd_nxt) |
| 1098 | && seq_lt (tc->psh_seq, snd_nxt + data_len)) |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 1099 | flags |= TCP_FLAG_PSH; |
| 1100 | } |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1101 | 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] | 1102 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 1103 | advertise_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1104 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1105 | if (maybe_burst) |
| 1106 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 1107 | clib_memcpy_fast ((u8 *) (th + 1), |
| 1108 | tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 1109 | tc->snd_opts_len); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1110 | } |
| 1111 | else |
| 1112 | { |
| 1113 | u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 1114 | ASSERT (len == tc->snd_opts_len); |
| 1115 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1116 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1117 | /* |
| 1118 | * Update connection variables |
| 1119 | */ |
| 1120 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1121 | if (update_snd_nxt) |
| 1122 | tc->snd_nxt += data_len; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1123 | tc->rcv_las = tc->rcv_nxt; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1124 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 1125 | TCP_EVT_DBG (TCP_EVT_PKTIZE, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 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 | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1132 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1, |
| 1133 | /* update_snd_nxt */ 1); |
| 1134 | 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] | 1135 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
| 1136 | /* If not tracking an ACK, start tracking */ |
| 1137 | if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) |
| 1138 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1139 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1140 | tc->rtt_seq = tc->snd_nxt; |
| 1141 | } |
| 1142 | if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) |
| 1143 | { |
| 1144 | tcp_retransmit_timer_set (tc); |
| 1145 | tc->rto_boff = 0; |
| 1146 | } |
| 1147 | tcp_trajectory_add_start (b, 3); |
| 1148 | return 0; |
| 1149 | } |
| 1150 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1151 | void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1152 | tcp_send_ack (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1153 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1154 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1155 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1156 | vlib_buffer_t *b; |
| 1157 | u32 bi; |
| 1158 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1159 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1160 | { |
| 1161 | tcp_update_rcv_wnd (tc); |
| 1162 | return; |
| 1163 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1164 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1165 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1166 | tcp_make_ack (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1167 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1168 | } |
| 1169 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1170 | void |
| 1171 | tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 1172 | { |
| 1173 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1174 | { |
| 1175 | vec_add1 (wrk->pending_acks, tc->c_c_index); |
| 1176 | tc->flags |= TCP_CONN_SNDACK; |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | void |
| 1181 | tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| 1182 | { |
| 1183 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1184 | { |
| 1185 | vec_add1 (wrk->pending_acks, tc->c_c_index); |
| 1186 | tc->flags |= TCP_CONN_SNDACK; |
| 1187 | } |
| 1188 | if (tc->pending_dupacks < 255) |
| 1189 | tc->pending_dupacks += 1; |
| 1190 | } |
| 1191 | |
| 1192 | void |
| 1193 | tcp_send_acks (tcp_worker_ctx_t * wrk) |
| 1194 | { |
| 1195 | u32 thread_index, *pending_acks; |
| 1196 | tcp_connection_t *tc; |
| 1197 | int i, j, n_acks; |
| 1198 | |
| 1199 | if (!vec_len (wrk->pending_acks)) |
| 1200 | return; |
| 1201 | |
| 1202 | thread_index = wrk->vm->thread_index; |
| 1203 | pending_acks = wrk->pending_acks; |
| 1204 | for (i = 0; i < vec_len (pending_acks); i++) |
| 1205 | { |
| 1206 | tc = tcp_connection_get (pending_acks[i], thread_index); |
| 1207 | tc->flags &= ~TCP_CONN_SNDACK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 1208 | if (!tc->pending_dupacks) |
| 1209 | { |
| 1210 | tcp_send_ack (tc); |
| 1211 | continue; |
| 1212 | } |
| 1213 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1214 | /* If we're supposed to send dupacks but have no ooo data |
| 1215 | * send only one ack */ |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 1216 | if (!vec_len (tc->snd_sacks)) |
| 1217 | { |
| 1218 | tcp_send_ack (tc); |
| 1219 | continue; |
| 1220 | } |
| 1221 | |
| 1222 | /* Start with first sack block */ |
| 1223 | tc->snd_sack_pos = 0; |
| 1224 | |
| 1225 | /* Generate enough dupacks to cover all sack blocks. Do not generate |
| 1226 | * more sacks than the number of packets received. But do generate at |
| 1227 | * least 3, i.e., the number needed to signal congestion, if needed. */ |
| 1228 | n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS; |
| 1229 | n_acks = clib_min (n_acks, tc->pending_dupacks); |
| 1230 | n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3)); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1231 | for (j = 0; j < n_acks; j++) |
| 1232 | tcp_send_ack (tc); |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 1233 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1234 | tc->pending_dupacks = 0; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 1235 | tc->snd_sack_pos = 0; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1236 | } |
| 1237 | _vec_len (wrk->pending_acks) = 0; |
| 1238 | } |
| 1239 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1240 | /** |
| 1241 | * Delayed ack timer handler |
| 1242 | * |
| 1243 | * Sends delayed ACK when timer expires |
| 1244 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1245 | void |
| 1246 | tcp_timer_delack_handler (u32 index) |
| 1247 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1248 | u32 thread_index = vlib_get_thread_index (); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1249 | tcp_connection_t *tc; |
| 1250 | |
| 1251 | tc = tcp_connection_get (index, thread_index); |
| 1252 | tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1253 | tcp_send_ack (tc); |
| 1254 | } |
| 1255 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1256 | /** |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1257 | * Allocate a new buffer and build a new tcp segment |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1258 | * |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1259 | * @param wrk tcp worker |
| 1260 | * @param tc connection for which the segment will be allocated |
| 1261 | * @param offset offset of the first byte in the tx fifo |
| 1262 | * @param max_deq_byte segment size |
| 1263 | * @param[out] b pointer to buffer allocated |
| 1264 | * |
| 1265 | * @return the number of bytes in the segment or 0 if buffer cannot be |
| 1266 | * allocated or no data available |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1267 | */ |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1268 | static int |
| 1269 | tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1270 | u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1271 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1272 | u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; |
| 1273 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1274 | u32 bi, seg_size; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1275 | int n_bytes = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1276 | u8 *data; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1277 | |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 1278 | seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1279 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1280 | /* |
| 1281 | * Prepare options |
| 1282 | */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1283 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1284 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1285 | /* |
| 1286 | * Allocate and fill in buffer(s) |
| 1287 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1288 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1289 | /* Easy case, buffer size greater than mss */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1290 | if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1291 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1292 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1293 | return 0; |
| 1294 | *b = vlib_get_buffer (vm, bi); |
| 1295 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1296 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1297 | max_deq_bytes); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1298 | ASSERT (n_bytes == max_deq_bytes); |
| 1299 | b[0]->current_length = n_bytes; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1300 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1301 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1302 | } |
| 1303 | /* Split mss into multiple buffers */ |
| 1304 | else |
| 1305 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1306 | u32 chain_bi = ~0, n_bufs_per_seg, n_bufs; |
| 1307 | u16 n_peeked, len_to_deq; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1308 | vlib_buffer_t *chain_b, *prev_b; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1309 | int i; |
| 1310 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1311 | /* Make sure we have enough buffers */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1312 | n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1313 | vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1, |
| 1314 | CLIB_CACHE_LINE_BYTES); |
| 1315 | n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg); |
| 1316 | if (PREDICT_FALSE (n_bufs != n_bufs_per_seg)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1317 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1318 | if (n_bufs) |
| 1319 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1320 | return 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1321 | } |
| 1322 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1323 | *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1324 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1325 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1326 | bytes_per_buffer - |
| 1327 | TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1328 | b[0]->current_length = n_bytes; |
| 1329 | b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| 1330 | b[0]->total_length_not_including_first_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1331 | max_deq_bytes -= n_bytes; |
| 1332 | |
| 1333 | chain_b = *b; |
| 1334 | for (i = 1; i < n_bufs_per_seg; i++) |
| 1335 | { |
| 1336 | prev_b = chain_b; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1337 | len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1338 | chain_bi = wrk->tx_buffers[--n_bufs]; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1339 | chain_b = vlib_get_buffer (vm, chain_bi); |
| 1340 | chain_b->current_data = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1341 | data = vlib_buffer_get_current (chain_b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1342 | n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data, |
| 1343 | offset + n_bytes, |
| 1344 | len_to_deq); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1345 | ASSERT (n_peeked == len_to_deq); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1346 | n_bytes += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1347 | chain_b->current_length = n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1348 | chain_b->next_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1349 | |
| 1350 | /* update previous buffer */ |
| 1351 | prev_b->next_buffer = chain_bi; |
| 1352 | prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| 1353 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1354 | max_deq_bytes -= n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1355 | b[0]->total_length_not_including_first_buffer += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1356 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1357 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1358 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1359 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1360 | |
| 1361 | if (PREDICT_FALSE (n_bufs)) |
| 1362 | { |
| 1363 | clib_warning ("not all buffers consumed"); |
| 1364 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1365 | } |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1366 | } |
| 1367 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1368 | ASSERT (n_bytes > 0); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1369 | ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1370 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1371 | return n_bytes; |
| 1372 | } |
| 1373 | |
| 1374 | /** |
| 1375 | * Build a retransmit segment |
| 1376 | * |
| 1377 | * @return the number of bytes in the segment or 0 if there's nothing to |
| 1378 | * retransmit |
| 1379 | */ |
| 1380 | static u32 |
| 1381 | tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, |
| 1382 | tcp_connection_t * tc, u32 offset, |
| 1383 | u32 max_deq_bytes, vlib_buffer_t ** b) |
| 1384 | { |
| 1385 | u32 start, available_bytes; |
| 1386 | int n_bytes = 0; |
| 1387 | |
| 1388 | ASSERT (tc->state >= TCP_STATE_ESTABLISHED); |
| 1389 | ASSERT (max_deq_bytes != 0); |
| 1390 | |
| 1391 | /* |
| 1392 | * Make sure we can retransmit something |
| 1393 | */ |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1394 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1395 | ASSERT (available_bytes >= offset); |
| 1396 | available_bytes -= offset; |
| 1397 | if (!available_bytes) |
| 1398 | return 0; |
| 1399 | |
| 1400 | max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes); |
| 1401 | max_deq_bytes = clib_min (available_bytes, max_deq_bytes); |
| 1402 | |
| 1403 | /* Start is beyond snd_congestion */ |
| 1404 | start = tc->snd_una + offset; |
| 1405 | if (seq_geq (start, tc->snd_congestion)) |
| 1406 | goto done; |
| 1407 | |
| 1408 | /* Don't overshoot snd_congestion */ |
| 1409 | if (seq_gt (start + max_deq_bytes, tc->snd_congestion)) |
| 1410 | { |
| 1411 | max_deq_bytes = tc->snd_congestion - start; |
| 1412 | if (max_deq_bytes == 0) |
| 1413 | goto done; |
| 1414 | } |
| 1415 | |
| 1416 | n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b); |
| 1417 | if (!n_bytes) |
| 1418 | return 0; |
| 1419 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1420 | if (tcp_in_fastrecovery (tc)) |
| 1421 | tc->snd_rxt_bytes += n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1422 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1423 | done: |
| 1424 | TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1425 | return n_bytes; |
| 1426 | } |
| 1427 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1428 | /** |
| 1429 | * Reset congestion control, switch cwnd to loss window and try again. |
| 1430 | */ |
| 1431 | static void |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1432 | tcp_rxt_timeout_cc (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1433 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1434 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1435 | tc->prev_ssthresh = tc->ssthresh; |
| 1436 | tc->prev_cwnd = tc->cwnd; |
| 1437 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1438 | /* Cleanly recover cc (also clears up fast retransmit) */ |
| 1439 | if (tcp_in_fastrecovery (tc)) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1440 | { |
| 1441 | /* TODO be less aggressive about this */ |
| 1442 | scoreboard_clear (&tc->sack_sb); |
| 1443 | tcp_cc_fastrecovery_exit (tc); |
| 1444 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1445 | else |
| 1446 | tc->rcv_dupacks = 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1447 | |
| 1448 | /* Start again from the beginning */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1449 | tc->cc_algo->congestion (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1450 | tc->cwnd = tcp_loss_wnd (tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1451 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1452 | tc->rtt_ts = 0; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1453 | tc->cwnd_acc_bytes = 0; |
Florin Coras | c44a558 | 2018-11-01 16:30:54 -0700 | [diff] [blame] | 1454 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss); |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1455 | tcp_recovery_on (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1456 | } |
| 1457 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1458 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1459 | tcp_timer_retransmit_handler_i (u32 index, u8 is_syn) |
| 1460 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1461 | u32 thread_index = vlib_get_thread_index (); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1462 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1463 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1464 | tcp_connection_t *tc; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1465 | vlib_buffer_t *b = 0; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1466 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1467 | |
| 1468 | if (is_syn) |
| 1469 | { |
| 1470 | tc = tcp_half_open_connection_get (index); |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1471 | /* Note: the connection may have transitioned to ESTABLISHED... */ |
Florin Coras | 311e11b | 2018-12-05 11:19:14 -0800 | [diff] [blame] | 1472 | if (PREDICT_FALSE (tc == 0 || tc->state != TCP_STATE_SYN_SENT)) |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1473 | return; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1474 | tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1475 | } |
| 1476 | else |
| 1477 | { |
| 1478 | tc = tcp_connection_get (index, thread_index); |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1479 | /* Note: the connection may have been closed and pool_put */ |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1480 | if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT)) |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1481 | return; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1482 | tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID; |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1483 | /* Wait-close and retransmit could pop at the same time */ |
| 1484 | if (tc->state == TCP_STATE_CLOSED) |
| 1485 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1486 | } |
| 1487 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1488 | if (tc->state >= TCP_STATE_ESTABLISHED) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1489 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1490 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1491 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1492 | /* Lost FIN, retransmit and return */ |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1493 | if (tc->flags & TCP_CONN_FINSNT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1494 | { |
| 1495 | tcp_send_fin (tc); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1496 | tc->rto_boff += 1; |
| 1497 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1498 | return; |
| 1499 | } |
| 1500 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1501 | /* Shouldn't be here. This condition is tricky because it has to take |
| 1502 | * into account boff > 0 due to persist timeout. */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1503 | if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1504 | || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion) |
| 1505 | && !tcp_flight_size (tc))) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1506 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1507 | ASSERT (!tcp_in_recovery (tc)); |
| 1508 | tc->rto_boff = 0; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1509 | return; |
| 1510 | } |
| 1511 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1512 | /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due |
| 1513 | * to persist timer timeout */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1514 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1515 | { |
| 1516 | tc->rto_boff = 0; |
| 1517 | tcp_update_rto (tc); |
| 1518 | } |
| 1519 | |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1520 | /* Peer is dead or network connectivity is lost. Close connection. |
| 1521 | * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For |
| 1522 | * a min rto of 0.2s we need to retry about 8 times. */ |
| 1523 | if (tc->rto_boff >= TCP_RTO_BOFF_MAX) |
| 1524 | { |
| 1525 | tcp_send_reset (tc); |
| 1526 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1527 | session_transport_closing_notify (&tc->connection); |
| 1528 | tcp_connection_timers_reset (tc); |
| 1529 | tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME); |
| 1530 | return; |
| 1531 | } |
| 1532 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1533 | /* Increment RTO backoff (also equal to number of retries) and go back |
| 1534 | * to first un-acked byte */ |
| 1535 | tc->rto_boff += 1; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1536 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1537 | /* First retransmit timeout */ |
| 1538 | if (tc->rto_boff == 1) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1539 | tcp_rxt_timeout_cc (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1540 | else |
| 1541 | scoreboard_clear (&tc->sack_sb); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1542 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1543 | /* If we've sent beyond snd_congestion, update it */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1544 | tc->snd_congestion = seq_max (tc->snd_nxt, tc->snd_congestion); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1545 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1546 | tc->snd_nxt = tc->snd_una; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1547 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1548 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1549 | /* Send one segment. Note that n_bytes may be zero due to buffer |
| 1550 | * shortfall */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1551 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1552 | if (!n_bytes) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1553 | { |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1554 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1555 | return; |
| 1556 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1557 | |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1558 | bi = vlib_get_buffer_index (vm, b); |
| 1559 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1560 | /* For first retransmit, record timestamp (Eifel detection RFC3522) */ |
| 1561 | if (tc->rto_boff == 1) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1562 | tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1563 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1564 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1565 | tcp_retransmit_timer_force_update (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1566 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1567 | /* Retransmit for SYN */ |
| 1568 | else if (tc->state == TCP_STATE_SYN_SENT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1569 | { |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1570 | /* Half-open connection actually moved to established but we were |
| 1571 | * waiting for syn retransmit to pop to call cleanup from the right |
| 1572 | * thread. */ |
| 1573 | if (tc->flags & TCP_CONN_HALF_OPEN_DONE) |
| 1574 | { |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1575 | if (tcp_half_open_connection_cleanup (tc)) |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1576 | TCP_DBG ("could not remove half-open connection"); |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1577 | return; |
| 1578 | } |
| 1579 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1580 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1581 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1582 | /* Try without increasing RTO a number of times. If this fails, |
| 1583 | * start growing RTO exponentially */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1584 | tc->rto_boff += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1585 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1586 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1587 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1588 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 1589 | tc->rto * TCP_TO_TIMER_TICK); |
| 1590 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1591 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1592 | { |
| 1593 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
| 1594 | return; |
| 1595 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1596 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1597 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1598 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1599 | tcp_make_syn (tc, b); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1600 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1601 | tc->rtt_ts = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1602 | TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0); |
| 1603 | |
| 1604 | /* This goes straight to ipx_lookup. Retransmit timer set already */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1605 | tcp_push_ip_hdr (wrk, tc, b); |
| 1606 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1607 | } |
| 1608 | /* Retransmit SYN-ACK */ |
| 1609 | else if (tc->state == TCP_STATE_SYN_RCVD) |
| 1610 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1611 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1612 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1613 | tc->rto_boff += 1; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1614 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1615 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1616 | tc->rtt_ts = 0; |
| 1617 | |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1618 | tcp_retransmit_timer_force_update (tc); |
| 1619 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1620 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1621 | { |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1622 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1623 | return; |
| 1624 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1625 | |
| 1626 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1627 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1628 | tcp_make_synack (tc, b); |
| 1629 | TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1); |
| 1630 | |
| 1631 | /* Retransmit timer already updated, just enqueue to output */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1632 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1633 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1634 | else |
| 1635 | { |
| 1636 | ASSERT (tc->state == TCP_STATE_CLOSED); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1637 | return; |
| 1638 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1639 | } |
| 1640 | |
| 1641 | void |
| 1642 | tcp_timer_retransmit_handler (u32 index) |
| 1643 | { |
| 1644 | tcp_timer_retransmit_handler_i (index, 0); |
| 1645 | } |
| 1646 | |
| 1647 | void |
| 1648 | tcp_timer_retransmit_syn_handler (u32 index) |
| 1649 | { |
| 1650 | tcp_timer_retransmit_handler_i (index, 1); |
| 1651 | } |
| 1652 | |
| 1653 | /** |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1654 | * Got 0 snd_wnd from peer, try to do something about it. |
| 1655 | * |
| 1656 | */ |
| 1657 | void |
| 1658 | tcp_timer_persist_handler (u32 index) |
| 1659 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1660 | u32 thread_index = vlib_get_thread_index (); |
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 | |
| 1674 | /* Make sure timer handle is set to invalid */ |
| 1675 | tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID; |
| 1676 | |
| 1677 | /* Problem already solved or worse */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 1678 | if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss |
| 1679 | || (tc->flags & TCP_CONN_FINSNT)) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1680 | return; |
| 1681 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1682 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1683 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1684 | |
| 1685 | /* Reprogram persist if no new bytes available to send. We may have data |
| 1686 | * next time */ |
| 1687 | if (!available_bytes) |
| 1688 | { |
| 1689 | tcp_persist_timer_set (tc); |
| 1690 | return; |
| 1691 | } |
| 1692 | |
| 1693 | if (available_bytes <= offset) |
| 1694 | { |
| 1695 | ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)); |
| 1696 | return; |
| 1697 | } |
| 1698 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1699 | /* Increment RTO backoff */ |
| 1700 | tc->rto_boff += 1; |
| 1701 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1702 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1703 | /* |
| 1704 | * Try to force the first unsent segment (or buffer) |
| 1705 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1706 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1707 | { |
| 1708 | tcp_persist_timer_set (tc); |
| 1709 | return; |
| 1710 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1711 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1712 | data = tcp_init_buffer (vm, b); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1713 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1714 | tcp_validate_txf_size (tc, offset); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1715 | 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] | 1716 | max_snd_bytes = clib_min (tc->snd_mss, |
| 1717 | tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN); |
| 1718 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1719 | max_snd_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1720 | b->current_length = n_bytes; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1721 | ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) |
| 1722 | || tc->snd_nxt == tc->snd_una_max |
| 1723 | || tc->rto_boff > 1)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1724 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1725 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, |
| 1726 | /* burst */ 0, /* update_snd_nxt */ 1); |
| 1727 | 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] | 1728 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1729 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1730 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1731 | /* Just sent new data, enable retransmit */ |
| 1732 | tcp_retransmit_timer_update (tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1736 | * Retransmit first unacked segment |
| 1737 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1738 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1739 | 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] | 1740 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1741 | vlib_main_t *vm = wrk->vm; |
| 1742 | vlib_buffer_t *b; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1743 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1744 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1745 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1746 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1747 | 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] | 1748 | if (!n_bytes) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1749 | return -1; |
| 1750 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1751 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1752 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1753 | |
| 1754 | return 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1755 | } |
| 1756 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1757 | static int |
| 1758 | tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1759 | u32 burst_size) |
| 1760 | { |
| 1761 | u32 offset, n_segs = 0, n_written, bi; |
| 1762 | vlib_main_t *vm = wrk->vm; |
| 1763 | vlib_buffer_t *b = 0; |
| 1764 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1765 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1766 | while (n_segs < burst_size) |
| 1767 | { |
| 1768 | n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); |
| 1769 | if (!n_written) |
| 1770 | goto done; |
| 1771 | |
| 1772 | bi = vlib_get_buffer_index (vm, b); |
| 1773 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1774 | offset += n_written; |
| 1775 | n_segs += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1776 | |
| 1777 | tc->snd_nxt += n_written; |
| 1778 | 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] | 1779 | } |
| 1780 | |
| 1781 | done: |
| 1782 | return n_segs; |
| 1783 | } |
| 1784 | |
| 1785 | #define scoreboard_rescue_rxt_valid(_sb, _tc) \ |
| 1786 | (seq_geq (_sb->rescue_rxt, _tc->snd_una) \ |
| 1787 | && seq_leq (_sb->rescue_rxt, _tc->snd_congestion)) |
| 1788 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1789 | /** |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1790 | * Do fast retransmit with SACKs |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1791 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1792 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1793 | tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1794 | u32 burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1795 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1796 | u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1797 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1798 | vlib_main_t *vm = wrk->vm; |
| 1799 | vlib_buffer_t *b = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1800 | sack_scoreboard_t *sb; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1801 | u32 bi, max_deq; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1802 | int snd_space; |
| 1803 | u8 snd_limited = 0, can_rescue = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1804 | |
| 1805 | ASSERT (tcp_in_fastrecovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1806 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1807 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1808 | if (snd_space < tc->snd_mss) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1809 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1810 | tcp_program_fastretransmit (wrk, tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1811 | return 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1812 | } |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1813 | |
| 1814 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1815 | sb = &tc->sack_sb; |
| 1816 | hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); |
| 1817 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1818 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1819 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1820 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1821 | while (snd_space > 0 && n_segs < burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1822 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1823 | hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue, |
| 1824 | &snd_limited); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1825 | if (!hole) |
| 1826 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1827 | if (max_deq) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1828 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1829 | snd_space = clib_min (max_deq, snd_space); |
| 1830 | burst_size = clib_min (burst_size - n_segs, |
| 1831 | snd_space / tc->snd_mss); |
| 1832 | n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size); |
| 1833 | if (max_deq > n_segs_now * tc->snd_mss) |
| 1834 | tcp_program_fastretransmit (wrk, tc); |
| 1835 | n_segs += n_segs_now; |
| 1836 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1837 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1838 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1839 | if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc)) |
| 1840 | break; |
| 1841 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1842 | /* If rescue rxt undefined or less than snd_una then one segment of |
| 1843 | * up to SMSS octets that MUST include the highest outstanding |
| 1844 | * unSACKed sequence number SHOULD be returned, and RescueRxt set to |
| 1845 | * RecoveryPoint. HighRxt MUST NOT be updated. |
| 1846 | */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1847 | max_bytes = clib_min (tc->snd_mss, |
| 1848 | tc->snd_congestion - tc->snd_una); |
| 1849 | max_bytes = clib_min (max_bytes, snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1850 | offset = tc->snd_congestion - tc->snd_una - max_bytes; |
| 1851 | sb->rescue_rxt = tc->snd_congestion; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1852 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1853 | max_bytes, &b); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1854 | if (!n_written) |
| 1855 | goto done; |
| 1856 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1857 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1858 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1859 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1860 | break; |
| 1861 | } |
| 1862 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1863 | max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); |
| 1864 | max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; |
| 1865 | if (max_bytes == 0) |
| 1866 | break; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1867 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1868 | offset = sb->high_rxt - tc->snd_una; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1869 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1870 | &b); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1871 | ASSERT (n_written <= snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1872 | |
| 1873 | /* Nothing left to retransmit */ |
| 1874 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1875 | break; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1876 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1877 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1878 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1879 | |
| 1880 | sb->high_rxt += n_written; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1881 | snd_space -= n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1882 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1883 | } |
| 1884 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1885 | if (hole) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1886 | tcp_program_fastretransmit (wrk, tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1887 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1888 | done: |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1889 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1890 | } |
| 1891 | |
| 1892 | /** |
| 1893 | * Fast retransmit without SACK info |
| 1894 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1895 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1896 | tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1897 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1898 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1899 | u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1900 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1901 | int snd_space, n_segs = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1902 | vlib_buffer_t *b; |
| 1903 | |
| 1904 | ASSERT (tcp_in_fastrecovery (tc)); |
| 1905 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1906 | |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 1907 | snd_space = tcp_available_cc_snd_space (tc); |
| 1908 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1909 | if (!tcp_fastrecovery_first (tc)) |
| 1910 | goto send_unsent; |
| 1911 | |
| 1912 | /* RFC 6582: [If a partial ack], retransmit the first unacknowledged |
| 1913 | * segment. */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1914 | while (snd_space > 0 && n_segs < burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1915 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1916 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1917 | tc->snd_mss, &b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1918 | |
| 1919 | /* Nothing left to retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1920 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1921 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1922 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1923 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1924 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1925 | snd_space -= n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1926 | offset += n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1927 | n_segs += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1928 | } |
| 1929 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1930 | if (n_segs == burst_size) |
| 1931 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1932 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1933 | send_unsent: |
| 1934 | |
| 1935 | /* 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] | 1936 | if (snd_space < tc->snd_mss || tc->snd_mss == 0) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1937 | goto done; |
| 1938 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1939 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1940 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1941 | if (max_deq) |
| 1942 | { |
| 1943 | snd_space = clib_min (max_deq, snd_space); |
| 1944 | burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss); |
| 1945 | n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size); |
| 1946 | if (max_deq > n_segs_now * tc->snd_mss) |
| 1947 | tcp_program_fastretransmit (wrk, tc); |
| 1948 | n_segs += n_segs_now; |
| 1949 | } |
| 1950 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1951 | done: |
| 1952 | tcp_fastrecovery_first_off (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1953 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1954 | } |
| 1955 | |
| 1956 | /** |
| 1957 | * Do fast retransmit |
| 1958 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1959 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1960 | tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1961 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1962 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1963 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1964 | return tcp_fast_retransmit_sack (wrk, tc, burst_size); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1965 | else |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1966 | return tcp_fast_retransmit_no_sack (wrk, tc, burst_size); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1967 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 1968 | #endif /* CLIB_MARCH_VARIANT */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1969 | |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1970 | static void |
| 1971 | 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] | 1972 | u16 * next0, u32 * error0) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1973 | { |
| 1974 | ip_adjacency_t *adj; |
| 1975 | adj_index_t ai; |
| 1976 | |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1977 | /* Not thread safe but as long as the connection exists the adj should |
| 1978 | * not be removed */ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1979 | ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, |
| 1980 | tc0->sw_if_index); |
| 1981 | if (ai == ADJ_INDEX_INVALID) |
| 1982 | { |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1983 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
| 1984 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 1985 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 1986 | return; |
| 1987 | } |
| 1988 | |
| 1989 | adj = adj_get (ai); |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1990 | if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1991 | *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; |
| 1992 | else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) |
| 1993 | *next0 = TCP_OUTPUT_NEXT_IP_ARP; |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1994 | else |
| 1995 | { |
| 1996 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 1997 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 1998 | } |
| 1999 | vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2000 | } |
| 2001 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2002 | static void |
| 2003 | tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2004 | u32 * to_next, u32 n_bufs) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2005 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2006 | u32 n_trace = vlib_get_trace_count (vm, node); |
| 2007 | tcp_connection_t *tc; |
| 2008 | tcp_tx_trace_t *t; |
| 2009 | vlib_buffer_t *b; |
| 2010 | tcp_header_t *th; |
| 2011 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2012 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2013 | for (i = 0; i < clib_min (n_trace, n_bufs); i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2014 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2015 | b = vlib_get_buffer (vm, to_next[i]); |
| 2016 | th = vlib_buffer_get_current (b); |
| 2017 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2018 | vm->thread_index); |
| 2019 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2020 | clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header)); |
| 2021 | clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2022 | } |
| 2023 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2024 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2025 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2026 | tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, |
| 2027 | tcp_connection_t * tc0, u8 is_ip4) |
| 2028 | { |
| 2029 | tcp_header_t *th0 = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2030 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2031 | th0 = vlib_buffer_get_current (b0); |
| 2032 | TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length); |
| 2033 | if (is_ip4) |
| 2034 | { |
| 2035 | vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4, |
| 2036 | IP_PROTOCOL_TCP, 1); |
| 2037 | b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 2038 | vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data; |
| 2039 | th0->checksum = 0; |
| 2040 | } |
| 2041 | else |
| 2042 | { |
| 2043 | ip6_header_t *ih0; |
| 2044 | ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6, |
| 2045 | &tc0->c_rmt_ip6, IP_PROTOCOL_TCP); |
| 2046 | b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 2047 | vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data; |
| 2048 | vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data; |
| 2049 | th0->checksum = 0; |
| 2050 | } |
| 2051 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2052 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2053 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2054 | tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, |
| 2055 | u32 * error0, u16 * next0, u8 is_ip4) |
| 2056 | { |
Florin Coras | 81a13db | 2018-03-16 08:48:31 -0700 | [diff] [blame] | 2057 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2058 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 2059 | { |
| 2060 | *error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2061 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2062 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2063 | } |
| 2064 | |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame^] | 2065 | /* If next_index is not drop use it */ |
| 2066 | *next0 = tc0->out_next_index ? tc0->out_next_index : *next0; |
| 2067 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2068 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; |
| 2069 | vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; |
| 2070 | |
| 2071 | if (!is_ip4) |
| 2072 | { |
| 2073 | if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6))) |
| 2074 | tcp_output_handle_link_local (tc0, b0, next0, error0); |
| 2075 | } |
| 2076 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2077 | if (!TCP_ALWAYS_ACK) |
| 2078 | tcp_timer_reset (tc0, TCP_TIMER_DELACK); |
| 2079 | } |
| 2080 | |
| 2081 | always_inline uword |
| 2082 | tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2083 | vlib_frame_t * frame, int is_ip4) |
| 2084 | { |
| 2085 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2086 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2087 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 2088 | |
| 2089 | from = vlib_frame_vector_args (frame); |
| 2090 | n_left_from = frame->n_vectors; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2091 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2092 | |
| 2093 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2094 | tcp46_output_trace_frame (vm, node, from, n_left_from); |
| 2095 | |
| 2096 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2097 | b = bufs; |
| 2098 | next = nexts; |
| 2099 | |
| 2100 | while (n_left_from >= 4) |
| 2101 | { |
| 2102 | u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT; |
| 2103 | tcp_connection_t *tc0, *tc1; |
| 2104 | |
| 2105 | { |
| 2106 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2107 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2108 | |
| 2109 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2110 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2111 | } |
| 2112 | |
| 2113 | next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2114 | |
| 2115 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2116 | thread_index); |
| 2117 | tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index, |
| 2118 | thread_index); |
| 2119 | |
| 2120 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2121 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
| 2122 | |
| 2123 | tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4); |
| 2124 | tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4); |
| 2125 | |
| 2126 | b += 2; |
| 2127 | next += 2; |
| 2128 | n_left_from -= 2; |
| 2129 | } |
| 2130 | while (n_left_from > 0) |
| 2131 | { |
| 2132 | u32 error0 = TCP_ERROR_PKTS_SENT; |
| 2133 | tcp_connection_t *tc0; |
| 2134 | |
| 2135 | if (n_left_from > 1) |
| 2136 | { |
Florin Coras | 91ca462 | 2018-06-30 11:27:59 -0700 | [diff] [blame] | 2137 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2138 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2139 | } |
| 2140 | |
| 2141 | next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2142 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2143 | thread_index); |
| 2144 | |
| 2145 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2146 | tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4); |
| 2147 | |
| 2148 | b += 1; |
| 2149 | next += 1; |
| 2150 | n_left_from -= 1; |
| 2151 | } |
| 2152 | |
| 2153 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 2154 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2155 | } |
| 2156 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2157 | VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2158 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2159 | { |
| 2160 | return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2161 | } |
| 2162 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2163 | VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2164 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2165 | { |
| 2166 | return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2167 | } |
| 2168 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2169 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2170 | VLIB_REGISTER_NODE (tcp4_output_node) = |
| 2171 | { |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2172 | .name = "tcp4-output", |
| 2173 | /* Takes a vector of packets. */ |
| 2174 | .vector_size = sizeof (u32), |
| 2175 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2176 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2177 | .error_strings = tcp_error_strings, |
| 2178 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2179 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2180 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2181 | foreach_tcp4_output_next |
| 2182 | #undef _ |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2183 | }, |
| 2184 | .format_buffer = format_tcp_header, |
| 2185 | .format_trace = format_tcp_tx_trace, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2186 | }; |
| 2187 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2188 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2189 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2190 | VLIB_REGISTER_NODE (tcp6_output_node) = |
| 2191 | { |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2192 | .name = "tcp6-output", |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2193 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2194 | .vector_size = sizeof (u32), |
| 2195 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2196 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2197 | .error_strings = tcp_error_strings, |
| 2198 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2199 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2200 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2201 | foreach_tcp6_output_next |
| 2202 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2203 | }, |
| 2204 | .format_buffer = format_tcp_header, |
| 2205 | .format_trace = format_tcp_tx_trace, |
| 2206 | }; |
| 2207 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2208 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2209 | typedef enum _tcp_reset_next |
| 2210 | { |
| 2211 | TCP_RESET_NEXT_DROP, |
| 2212 | TCP_RESET_NEXT_IP_LOOKUP, |
| 2213 | TCP_RESET_N_NEXT |
| 2214 | } tcp_reset_next_t; |
| 2215 | |
| 2216 | #define foreach_tcp4_reset_next \ |
| 2217 | _(DROP, "error-drop") \ |
| 2218 | _(IP_LOOKUP, "ip4-lookup") |
| 2219 | |
| 2220 | #define foreach_tcp6_reset_next \ |
| 2221 | _(DROP, "error-drop") \ |
| 2222 | _(IP_LOOKUP, "ip6-lookup") |
| 2223 | |
| 2224 | static uword |
| 2225 | tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2226 | vlib_frame_t * from_frame, u8 is_ip4) |
| 2227 | { |
| 2228 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2229 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2230 | |
| 2231 | from = vlib_frame_vector_args (from_frame); |
| 2232 | n_left_from = from_frame->n_vectors; |
| 2233 | |
| 2234 | next_index = node->cached_next_index; |
| 2235 | |
| 2236 | while (n_left_from > 0) |
| 2237 | { |
| 2238 | u32 n_left_to_next; |
| 2239 | |
| 2240 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2241 | |
| 2242 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2243 | { |
| 2244 | u32 bi0; |
| 2245 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2246 | tcp_tx_trace_t *t0; |
| 2247 | tcp_header_t *th0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2248 | u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2249 | |
| 2250 | bi0 = from[0]; |
| 2251 | to_next[0] = bi0; |
| 2252 | from += 1; |
| 2253 | to_next += 1; |
| 2254 | n_left_from -= 1; |
| 2255 | n_left_to_next -= 1; |
| 2256 | |
| 2257 | b0 = vlib_get_buffer (vm, bi0); |
| 2258 | |
| 2259 | if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags, |
| 2260 | my_thread_index, is_ip4)) |
| 2261 | { |
| 2262 | error0 = TCP_ERROR_LOOKUP_DROPS; |
| 2263 | next0 = TCP_RESET_NEXT_DROP; |
| 2264 | goto done; |
| 2265 | } |
| 2266 | |
| 2267 | /* Prepare to send to IP lookup */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 2268 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2269 | next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2270 | |
| 2271 | done: |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2272 | b0->error = node->errors[error0]; |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 2273 | b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2274 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2275 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2276 | th0 = vlib_buffer_get_current (b0); |
| 2277 | if (is_ip4) |
| 2278 | th0 = ip4_next_header ((ip4_header_t *) th0); |
| 2279 | else |
| 2280 | th0 = ip6_next_header ((ip6_header_t *) th0); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2281 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2282 | clib_memcpy_fast (&t0->tcp_header, th0, |
| 2283 | sizeof (t0->tcp_header)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2284 | } |
| 2285 | |
| 2286 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2287 | n_left_to_next, bi0, next0); |
| 2288 | } |
| 2289 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2290 | } |
| 2291 | return from_frame->n_vectors; |
| 2292 | } |
| 2293 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2294 | VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2295 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2296 | { |
| 2297 | return tcp46_send_reset_inline (vm, node, from_frame, 1); |
| 2298 | } |
| 2299 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2300 | VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2301 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2302 | { |
| 2303 | return tcp46_send_reset_inline (vm, node, from_frame, 0); |
| 2304 | } |
| 2305 | |
| 2306 | /* *INDENT-OFF* */ |
| 2307 | VLIB_REGISTER_NODE (tcp4_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2308 | .name = "tcp4-reset", |
| 2309 | .vector_size = sizeof (u32), |
| 2310 | .n_errors = TCP_N_ERROR, |
| 2311 | .error_strings = tcp_error_strings, |
| 2312 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2313 | .next_nodes = { |
| 2314 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2315 | foreach_tcp4_reset_next |
| 2316 | #undef _ |
| 2317 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2318 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2319 | }; |
| 2320 | /* *INDENT-ON* */ |
| 2321 | |
| 2322 | /* *INDENT-OFF* */ |
| 2323 | VLIB_REGISTER_NODE (tcp6_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2324 | .name = "tcp6-reset", |
| 2325 | .vector_size = sizeof (u32), |
| 2326 | .n_errors = TCP_N_ERROR, |
| 2327 | .error_strings = tcp_error_strings, |
| 2328 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2329 | .next_nodes = { |
| 2330 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2331 | foreach_tcp6_reset_next |
| 2332 | #undef _ |
| 2333 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2334 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2335 | }; |
| 2336 | /* *INDENT-ON* */ |
| 2337 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2338 | /* |
| 2339 | * fd.io coding-style-patch-verification: ON |
| 2340 | * |
| 2341 | * Local Variables: |
| 2342 | * eval: (c-set-style "gnu") |
| 2343 | * End: |
| 2344 | */ |